chore: add test for RegoFnOpts (#171)

Bumps [github.com/sigstore/sigstore](https://github.com/sigstore/sigstore) from 1.8.8 to 1.8.9.
- [Release notes](https://github.com/sigstore/sigstore/releases)
- [Commits](https://github.com/sigstore/sigstore/compare/v1.8.8...v1.8.9)

---
updated-dependencies:
- dependency-name: github.com/sigstore/sigstore
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/release-drafter-config.yml

@@ -14,6 +14,9 @@ categories:
   - title: "🧰 Maintenance"
     labels:
       - "chore"
+  - title: "💥 Breaking Changes"
+    labels:
+      - "breaking"
 
 change-template: "- $TITLE @$AUTHOR (#$NUMBER)"
 change-title-escapes: '\<*_&' # You can add # and @ to disable mentions, and add ` to disable code blocks.
@@ -21,6 +24,7 @@ version-resolver:
   major:
     labels:
       - "major"
+      - "breaking"
   minor:
     labels:
       - "minor"
@@ -37,26 +41,19 @@ autolabeler:
   - label: "chore"
     files:
       - "*.md"
-    branch:
-      - '/docs{0,1}\/.+/'
-      - '/tests{0,1}\/.+/'
-      - '/chore{0,1}\/.+/'
     title:
-      - "/docs/i"
-      - "/test/i"
-      - "/chore/i"
+      - "/^docs!?:/i"
+      - "/^test!?:/i"
+      - "/^chore!?:/i"
+      - "/^refactor!?:/i"
   - label: "bug"
-    branch:
-      - '/fix\/.+/'
-      - '/revert\/.+/'
     title:
-      - "/fix/i"
-      - "/revert/i"
+      - "/^fix!?:/i"
+      - "/^revert!?:/i"
   - label: "feature"
-    branch:
-      - '/feature\/.+/'
-      - '/feat\/.+/'
-      - '/add\/.+/'
     title:
-      - "/feat/i"
-      - "/add/i"
+      - "/^feat!?:/i"
+      - "/^add!?:/i"
+  - label: "breaking"
+    title:
+      - "/^[a-zA-Z]+!:/i"

.github/workflows/lint.yml

@@ -0,0 +1,19 @@
+name: lint code
+on:
+  pull_request:
+  workflow_dispatch:
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set git to use LF
+        run: git config --global core.autocrlf false
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: 1.22.x
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v6
+        with:
+          version: v1.59
+          only-new-issues: true

.github/workflows/release.yml

@@ -0,0 +1,24 @@
+name: release
+on:
+  release:
+    types: [published]
+jobs:
+  trigger_attest_update:
+    name: Update attest lib - ALL
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Generate GitHub App Token
+        id: app-token
+        uses: actions/create-github-app-token@5d869da34e18e7287c1daad50e0b8ea0f506ce69 # v1.11.0
+        with:
+            app-id: ${{ vars.ATTEST_RELEASE_APP_ID }}
+            private-key: ${{ secrets.ATTEST_RELEASE_APP_PRIVATE_KEY }}
+            repositories: "attest-actions"
+      - name: Send repository_dispatch event
+        uses: peter-evans/repository-dispatch@v3.0.0
+        with:
+          token: ${{ steps.app-token.outputs.token }}
+          event-type: update_attest_all
+          repository: docker/attest-actions
+          client-payload: '{"attest_version": "${{ github.ref_name }}"}'

.github/workflows/test.yml

@@ -7,9 +7,12 @@ on:
   workflow_dispatch:
 jobs:
   golang:
+    permissions:
+      contents: read
+      id-token: write
     strategy:
       matrix:
-        go-version: [1.21.x]
+        go-version: [1.22.x, 1.23.x]
         # temp disable windows tests see https://github.com/docker/image-signer-verifier/pull/154
         # os: [ubuntu-latest, macos-latest, windows-latest]
         os: [ubuntu-latest, macos-latest]
@@ -21,13 +24,38 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go-version }}
+      - name: Login to Docker Hub
+        if: matrix.os == 'ubuntu-latest' && github.actor != 'dependabot[bot]'
+        uses: docker/login-action@v3
+        with:
+          username: dockerpublicbot
+          password: ${{ secrets.DOCKERPUBLICBOT_WRITE_PAT }}
+      - name: Authenticate to AWS
+        if: matrix.os == 'ubuntu-latest' && github.actor != 'dependabot[bot]'
+        uses: aws-actions/configure-aws-credentials@e3dd6a429d7300a6a4c196c26e071d42e0343502 #v4.0.2
+        with:
+          aws-region: "us-east-1"
+          role-to-assume: arn:aws:iam::175142243308:role/doi-github-actions-signing
+      - name: auth-with-gcp
+        if: matrix.os == 'ubuntu-latest' && github.actor != 'dependabot[bot]'
+        uses: google-github-actions/auth@v2
+        with:
+          project_id: 'attest-kms-test'
+          export_environment_variables: true
+          workload_identity_provider: 'projects/385966116051/locations/global/workloadIdentityPools/attest-kms-test/providers/attest-kms-test'
+          service_account: 'attest-kms-test@attest-kms-test.iam.gserviceaccount.com'
       - name: Setup Testcontainers Cloud Client
         uses: atomicjar/testcontainers-cloud-setup-action@v1
         with:
           token: ${{ secrets.TC_CLOUD_TOKEN }}
-      - name: go test
-        run: go test -v ./... -coverprofile=coverage.out -covermode=atomic
+      - name: go test including e2e
+        if: matrix.os == 'ubuntu-latest' && github.actor != 'dependabot[bot]'
+        run: go test -tags=e2e -v ./... -coverpkg=./... -coverprofile=coverage.out -covermode=atomic
+      - name: go test excluding e2e
+        if: matrix.os == 'macos-latest' || github.actor == 'dependabot[bot]'
+        run: go test -v ./...
       - name: Upload coverage to Codecov
+        if: matrix.os == 'ubuntu-latest' && github.actor != 'dependabot[bot]'
         uses: codecov/codecov-action@v4
         with:
           file: ./coverage.out

.gitignore

@@ -19,3 +19,4 @@
 
 # Go workspace file
 go.work
+.aider*

.golangci.yaml

@@ -0,0 +1,36 @@
+run:
+  timeout: 5m
+  go: "1.22"
+
+linters-settings:
+  gocritic:
+    enabled-tags:
+      - performance
+  lll:
+    line-length: 200
+
+  misspell:
+    locale: US
+
+linters:
+  disable-all: true
+  enable:
+    - errcheck
+    - forcetypeassert
+    - gocritic
+    - goconst
+    - godot
+    - gofmt
+    - gofumpt
+    - goimports
+    - gosec
+    - gosimple
+    - govet
+    - importas
+    - ineffassign
+    - misspell
+    - revive # replacement for golint
+    - staticcheck
+    - typecheck
+    - unused
+    - whitespace

CONTRIBUTING.md

@@ -0,0 +1,85 @@
+# Contribute to the attest Library
+
+Want to hack on the attest library? This guide will help you to find out how to contribute.
+
+This page contains information about reporting issues as well as some tips and guidelines useful to experienced open source contributors. Finally, make sure you read our [community guidelines](#community-guidelines) before you start participating.
+
+## Topics
+
+* [Reporting Security Issues](#reporting-security-issues)
+* [Design and Cleanup Proposals](#design-and-cleanup-proposals)
+* [Reporting Issues](#reporting-other-issues)
+* [Quick Contribution Tips and Guidelines](#quick-contribution-tips-and-guidelines)
+* [Community Guidelines](#community-guidelines)
+
+## Reporting security issues
+
+The attest maintainers take security seriously. If you discover a security issue, please bring it to their attention right away!
+
+Please **DO NOT** file a public issue, instead send your report privately to [security@docker.com](mailto:security@docker.com).
+
+Security reports are greatly appreciated and we will publicly thank you for it, although we keep your name confidential if you request it. We also like to send gifts—if you're into schwag, make sure to let us know. We currently do not offer a paid security bounty program, but are not ruling it out in the future.
+
+## Reporting other issues
+
+A great way to contribute to the project is to send a detailed report when you encounter an issue. We always appreciate a well-written, thorough bug report, and will thank you for it!
+
+Check that [our issue database](https://github.com/docker/attest/issues) doesn't already include that problem or suggestion before submitting an issue. If you find a match, you can use the "subscribe" button to get notified on updates. Do *not* leave random "+1" or "I have this too" comments. Those comments can become annoying very quickly. Instead, use [GitHub reactions](https://docs.github.com/en/free-pro-team@latest/github/writing-on-github/using-emojis).
+
+### How to report a bug
+
+* **Use a clear and descriptive title** for the issue to identify the problem.
+* **Describe the exact steps which reproduce the problem** in as many details as possible. When listing steps, **don't just say what you did, but explain how you did it**.
+* **Provide specific examples to demonstrate the steps**. Include links to files or GitHub projects, or copy/pasteable snippets, which you use in those examples. If you're providing snippets in the issue, use [Markdown code blocks](https://help.github.com/articles/markdown-basics/#multiple-lines).
+* **Describe the behavior you observed after following the steps** and point out what exactly is the problem with that behavior.
+* **Explain which behavior you expected to see instead and why.**
+* **Include screenshots and animated GIFs** which show you following the described steps and clearly demonstrate the problem.
+* **If the problem is related to performance or memory**, include a [CPU profile capture](https://blog.golang.org/profiling-go-programs) with your report.
+* **If the problem wasn't triggered by a specific action**, describe what you were doing before the problem happened.
+* **Include the version of attest you are using**.
+* **Include the name and version of the OS you're using**.
+
+## Quick contribution tips and guidelines
+
+This section gives a brief overview of how to propose a change to attest.
+
+### Contribution flow
+
+1. Fork the repository on GitHub.
+2. Create a topic branch from where you want to base your work.
+3. Make commits of logical units.
+4. Make sure your commit messages are in the proper format (see below).
+5. Push your changes to a topic branch in your fork of the repository.
+6. Submit a pull request to the original repository.
+
+### Format of the commit message
+
+We follow a rough convention for commit messages [borrowed from Angular](https://www.conventionalcommits.org/en/v1.0.0/).
+
+- **feat**: A new feature
+- **fix**: A bug fix
+- **docs**: Documentation only changes
+- **style**: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
+- **refactor**: A code change that neither fixes a bug nor adds a feature
+- **perf**: A code change that improves performance
+- **test**: Adding missing or correcting existing tests
+- **chore**: Changes to the build process or auxiliary tools and libraries such as documentation generation
+
+### Code review process
+
+All submissions, including submissions by project members, require review. We use GitHub pull requests for this purpose.
+
+### Tips for contributors
+
+1. All code should be formatted with `gofmt -s`.
+2. All code should pass the default levels of [`golint`](https://github.com/golang/lint).
+3. All code should follow the guidelines covered in [Effective Go](http://golang.org/doc/effective_go.html) and [Go Code Review Comments](https://github.com/golang/go/wiki/CodeReviewComments).
+4. Comment the code. Tell us the why, the history, and the context.
+5. Document _all_ public declarations and methods. Declare expectations, caveats, and anything else that may be important. If a type gets exported, having the comments already there will ensure it's ready.
+6. Variable name length should be proportional to its context and no longer. `noCommaALongVariableNameLikeThisIsNotMoreClearWhenASimpleCommentWouldDo`. In practice, short methods will have short variable names and globals will have longer names.
+7. No underscores in package names. If you need a compound name, step back, and re-examine why you need a compound name. If you still think you need a compound name, lose the underscore.
+8. No utils or helpers packages. If a function is not general enough to warrant its own package, it has not been written generally enough to be a part of a util package. Just leave it unexported and well-documented.
+9. All tests should run with `go test` and outside tooling should not be required. No, we don't need another unit testing framework.
+10. Even though we call these "rules" above, they are actually just guidelines. Since you've read all the rules, you now know that.
+
+If you are having trouble getting into the mood of idiomatic Go, we recommend reading through [Effective Go](https://go.dev/doc/effective_go). The [Go Blog](https://go.dev/blog/) is also a great resource. Drinking the kool-aid is a lot easier than going thirsty.

README.md

@@ -1,16 +1,385 @@
-# attest
-library to create, verify, and evaluate policy for attestations on container images
+# `attest`
 
+<div align="center">
+Library to create attestation signatures on container images, and verify images against policy.
+
+[![Go Reference](https://pkg.go.dev/badge/github.com/docker/attest.svg)](https://pkg.go.dev/github.com/docker/attest)
+[![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/docker/attest/test.yml?branch=main)](https://github.com/docker/attest/actions/workflows/test.yml)
 [![codecov](https://codecov.io/gh/docker/attest/graph/badge.svg?token=cGT0f1ACKg)](https://codecov.io/gh/docker/attest)
 
-# usage
-## signing and verifying attestations
-See [example_sign_test.go](./pkg/attest/example_sign_test.go)
+</div>
 
-See [example_verify_test.go](./pkg/attest/example_verify_test.go)
+# Table of Contents
 
-## mirroring TUF repositories to OCI
-See [example_mirror_test.go](./pkg/mirror/example_mirror_test.go)
+- [`attest`](#attest)
+- [Table of Contents](#table-of-contents)
+- [What is this?](#what-is-this)
+- [Features](#features)
+- [Installation](#installation)
+- [Usage](#usage)
+  - [Verifying Image Attestations](#verifying-image-attestations)
+  - [Signing Attestations](#signing-attestations)
+- [Rego Policy](#rego-policy)
+  - [Writing Policy](#writing-policy)
+    - [Input](#input)
+    - [Builtin Functions](#builtin-functions)
+  - [Policy Mapping](#policy-mapping)
+- [Public Key IDs](#public-key-ids)
+- [Transparency Logging](#transparency-logging)
+- [Verification Summary Attestation (VSA)](#verification-summary-attestation-vsa)
+  - [Example VSA](#example-vsa)
+- [API Reference](#api-reference)
+- [Project Layout](#project-layout)
+- [Versioning](#versioning)
 
-### using `go-tuf` OCI registry client
-See [example_registry_test.go](./pkg/tuf/example_registry_test.go)
+# What is this?
+
+`attest` is a library for signing and verifying [in-toto](https://in-toto.io/) attestations on container images.
+Examples of attestations include statements about the provenance and SBOM of an image.
+
+This library can be used to verify these attestations using Rego policy.
+Policy can be used to check whether an attestation is correctly signed, and that the contents of the attestation are correct.
+
+Our overall goal with this project is adoption of the ideas into other open-source projects, rather than to create another standalone tool.
+It would be a great outcome if this library was no longer needed because the functionality was built into other tools.
+
+# Features
+
+- Sign in-toto attestations
+- Push attestations to container registries using OCI 1.1 compatible artifacts
+- Verify attestations on container images using Rego policy and attestations fetched using OCI 1.1 referrers
+
+# Installation
+
+```shell
+$ go get github.com/docker/attest
+```
+
+# Usage
+
+## Verifying Image Attestations
+
+An image's attestations can be verified against a policy using the `attest.Verify` function.
+This function takes an [oci.ImageSpec](https://github.com/docker/attest/blob/781a738b54b9549c1dabfd7ea3f7ea582514ddec/pkg/oci/types.go#L35-L41) for the image to verify, and a set of options for policy resolution.
+By default, the policy is resolved from the [the Docker TUF repository](https://github.com/docker/tuf), but the options can be used to specify an alternative TUF repository, a local policy directory, and/or a policy ID to use.
+See [Policy Mapping](#policy-mapping) for more details.
+
+The `attest.Verify` function returns a `VerificationSummary` object, which contains the results of the policy evaluation.
+
+See [example_verify_test.go](./example_verify_test.go) for an example of how to verify an image against a policy.
+
+## Signing Attestations
+
+in-toto statements can be signed directly using the `attestation.SignInTotoStatement` function.
+This function takes a statement and DSSE signer, and returns a signed DSSE envelope containing a copy of the original statement.
+
+For the common use case of signing a statement and adding it to a manifest, e.g. for pushing to a registry as a referrer to the image being attested, the `attestation.AttestationManifest` type can be used.
+See [example_attestation_manifest_test.go](./pkg/attestation/example_attestation_manifest_test.go)
+
+See also [example_sign_test.go](./example_sign_test.go) for an example of how to sign all attached in-toto statements on an image, e.g. those produced by buildkit.
+
+# Rego Policy
+
+An image policy consists of one or more `rego` files and, optionally, `json` or `yaml` data files.
+
+The policies for trusted namespaces `docker.io/docker` and `docker.io/library` are stored in [the Docker TUF root](https://github.com/docker/tuf) under the `docker` and `doi` target sub-directories respectively.
+
+## Writing Policy
+
+`attest` uses [Open Policy Agent](https://www.openpolicyagent.org/) (OPA) for policy evaluation, and policies are written in Rego.
+A full guide to writing Rego policies is available in the [Rego documentation](https://www.openpolicyagent.org/docs/latest/policy-language/).
+
+For attest, a policy must contain at a minimum a `result` rule in a package called `attest` that returns an object matching the schema defined by the [`policy.Result`](https://github.com/docker/attest/blob/bd2c4d7d8aa497754b674412b09628be8d02fab5/pkg/policy/types.go#L23-L27) struct.
+For example:
+
+```rego
+package attest
+
+import rego.v1
+
+result := {
+	"success": true,
+	"violations": set(),
+	"summary": {
+		"subjects": subjects,
+		"slsa_levels": ["SLSA_BUILD_LEVEL_3"],
+		"verifier": "docker-official-images",
+		"policy_uri": "https://docker.com/official/policy/v0.1",
+	},
+}
+```
+
+The meanings of the fields in the `result` object are as follows:
+
+- `success` (bool): whether the policy passes
+- `violations` (set): a set of strings describing any policy violations
+- `summary` (object): a summary of the policy evaluation, used to construct a Verification Summary Attestation (VSA)
+  - `subjects` (set): a set of strings representing the subjects of each attestation that was evaluated
+  - `slsa_levels` (list): a list of strings representing the SLSA levels that the policy complies with
+  - `verifier` (string): the entity that verified the policy
+  - `policy_uri` (string): the URI of the policy
+
+The `violations` set may contain policy violations even if `success` is `true`.
+This can be useful if there are attestations that are invalid, but are not required by the policy.
+
+### Input
+
+The input to the policy is an object with the following fields:
+
+- `digest` (string): the digest of the image being verified
+- `purl` (string): the package URL of the image being verified
+- `platform` (string): the platform of the image being verified
+- `normalized_name` (string): defaults are filled out. e.g. if the image is `alpine`, this would be `library/alpine`
+- `familiar_name` (string): short version of above (e.g. `alpine`)
+- `tag`: (string): tag of the image being verified (if present)
+
+### Builtin Functions
+
+There are two builtin functions provided by `attest` that can be used to help with policy evaluation:
+
+- `attest.fetch(predicate_type)`: fetches all attestations for the input image with the given predicate type.
+  For example, `attest.fetch("https://spdx.dev/Document")` will fetch all SPDX SBOM attestations for the input image.
+- `attest.verify(attestation, options)`: verifies the DSSE envelope of the given attestation, and returns the statement.
+  The options object can contain the following fields:
+  - `keys` (array): keys to use for signature verification. Each key contains the following fields:
+    - `id` (string): the key ID as specified in [Public Key IDs](#public-key-ids)
+    - `key` (string): the PEM-encoded public key
+    - `from` (string): the time from which the key is valid, or `null` if the key was always valid (default: `null`)
+    - `status` (string): `active` if the key is active, otherwise the reason the key is inactive.
+      This is only used in error messages if the `from` date is in the past
+    - `distrust` (bool): whether the key should be distrusted (default: `false`).
+      If `true`, the key will be considered invalid
+    - `signing-format` (string): the format of the signing key, must be `dssev1`
+  - `skip_tl` (bool): whether to skip transparency log entry verification (see [Transparency Logging](#transparency-logging)) (default: `false`)
+
+Both `attest.fetch` and `attest.verify` return an object with the following fields:
+
+- `value`: the return value of the function if successful
+- `error`: an error message if the function failed
+
+This is to allow the policy to easily construct a violation if an error occurs, which isn't usually possible with custom functions in Rego.
+
+The return value of `attest.fetch` is an attestation which can be passed to `attest.verify`.
+
+## Policy Mapping
+
+A `mapping.yaml` file is stored at the root of TUF targets and contains the mapping from repository name to files containing the corresponding policy.
+
+A simple mapping file might look like this:
+
+```yaml
+version: v1
+kind: policy-mapping
+policies:
+  - id: docker-official-images
+    description: Docker Official Images
+    files:
+      - path: doi/policy.rego
+rules:
+  - pattern: "^docker[.]io/library/(.*)$"
+    policy-id: docker-official-images
+```
+
+The `policies` section contains a list of policies, each with an `id` and a `description`, and a list of `files` containing the policy.
+The `rules` section contains a list of rules that map regex expressions to policies.
+If the `pattern` regex matches the repository name, the policy with the `policy-id` is used to evaluate the image.
+In the above example, any repository in the `docker.io/library` namespace will be evaluated against the policy in `doi/policy.rego`.
+
+Sometimes it is necessary to rewrite the repository name before evaluating the policy.
+This can be useful when the repository name which is used to reference the image is different from the repository name in the attestations.
+For example, when mirroring images from a public registry to a private registry, the repository name in the attestations will be the public registry, but the image will be referenced by the name of the private registry.
+
+An example of a mapping file with rewrite rules might look like this:
+
+```yaml
+version: v1
+kind: policy-mapping
+policies:
+  - id: docker-official-images
+    description: Docker Official Images
+    files:
+      - path: doi/policy.rego
+rules:
+  - pattern: "^docker[.]io/library/(.*)$"
+    policy-id: docker-official-images
+  - pattern: "^public[.]ecr[.]aws/docker/library/(.*)$"
+    platforms: ["linux/amd64"] # optional: restrict image platforms for matching policies (default: all)
+    rewrite: docker.io/library/$1
+```
+`platforms` in the second rule above is optional and can be used to restrict the platforms for which the policy
+ is evaluated. If the `platforms` field is not present, the policy will be applied to all platforms.
+ It's important to note that the `platforms` field is a filter, and is applied before the `pattern`
+ field is processed, so both `platforms` and `pattern` need to match in order for the policy to be selected
+ (or the rewrite to be processed if present).
+
+As before, any repository in the `docker.io/library` namespace will be evaluated against the policy in `doi/policy.rego`.
+The second rule will rewrite any repository in the `public.ecr.aws/docker/library` namespace to `docker.io/library`.
+This means two things:
+
+1. The rules are evaluated again using the rewritten repository name until a policy is found (in this case the first rule will match); and
+2. The rewritten name is passed into the actual policy when it is evaluated.
+
+The `rewrite` field is not a simple string replacement, but a regex replacement.
+This means that the `rewrite` field can contain capture groups that are referenced in the `pattern` field.
+For example, the `rewrite` field in the example above contains `$1`, which is a reference to the first capture group in the `pattern` field.
+
+> [!IMPORTANT]
+> It's important to remember to escape the `.` character in the `pattern` field, as it is a special character in regex.
+> This is why the `.` character is surrounded by `[]` in the example above.
+>
+> It's also important to make use of the `^` and `$` characters in the `pattern` field to ensure that the regex matches the entire repository name.
+> This is to prevent the regex from matching a subset of the repository name, e.g. `docker.io/library` matching `notdocker.io/library`.
+
+Local policy can also be specified via a local `mapping.yaml`, which can be used to create new mirrors of policies described in the Docker TUF root, as well as describing entirely independent policies. For example:
+
+```golang
+// configure policy options
+opts := &policy.PolicyOptions{
+  TufClient:       tufClient,
+  LocalPolicyDir:  "<policy-dir>", // overrides TUF policy for local policy files if set
+  PolicyId:        "<policy-id>", // set to ignore policy mapping and select a policy by id
+}
+
+src, err := oci.ParseImageSpec(image, oci.WithPlatform(platform))
+if err != nil {
+  panic(err)
+}
+// verify attestations
+result, err := attest.Verify(context.Background(), src, opts)
+if err != nil {
+  panic(err)
+}
+```
+
+where `<policy-dir>` is a directory containing a `mapping.yaml` file, and any policy files referenced in the `mapping.yaml`. For example:
+
+```
+├── myimages
+│   ├── data.yaml
+|   ├── keys.yaml
+│   └── policy.rego
+└── mapping.yaml
+```
+
+> [!NOTE]
+>
+> `PolicyId` can also be set to select a policy by ID, completely ignoring the `rules` section of the mapping file.
+
+The rules section of a local `mapping.yaml` can refer to the policies described in the `mapping.yaml` file in the Docker TUF root to specify additional mirrors to which the referenced policy can be applied.
+
+For example, it might be desirable to mirror `docker.io/library` to a local registry for testing:
+
+```yaml
+version: v1
+kind: policy-mapping
+rules:
+  - pattern: "^localhost:5001/(.*)$"
+    rewrite: docker.io/library/$1
+```
+
+The rewritten repository name will match the `docker-official-images` polict in the TUF managed `mapping.yaml`.
+
+> [!WARNING]
+> Local `mapping.yaml` policies take precendence over TUF managed policies, so for example, it's possible to apply a custom policy to `docker.io/library` namespace:
+>
+> ```yaml
+> version: v1
+> kind: policy-mapping
+> policies:
+>   - id: mydoi
+>     description: my doi policy
+>     files:
+>       - path: "mypolicy.rego"
+>
+> rules:
+>   - pattern: "^docker[.]io/library/(.*)$"
+>     policy-id: mydoi
+> ```
+
+# Public Key IDs
+
+When signing attestations, a key-id is generated from the public key and added to envelope.
+This is used at verification time to look up the public key.
+
+To generate a key-id from a public key, use `openssl` as follows:
+
+```shell
+openssl pkey -in <public-key.pem> -pubin -outform DER | openssl dgst -sha256
+```
+
+# Transparency Logging
+
+`attest` supports transparency logging for attestation signatures.
+This serves two purposes:
+
+1. the transparency log is a mechanism to ensure that all attestations are logged in a tamper-evident way, and that the logs are publicly auditable; and
+2. the transparency log is a trusted source of timestamps for attestations, which allows signatures to be verified even if the key used to sign the attestation has expired.
+
+By default, transparency logging is enabled and the logs are stored in the [public-good Rekor](https://docs.sigstore.dev/logging/overview/) instance.
+Another transparency log can be used by creating an implementation of the [tl.TL](https://github.com/docker/attest/blob/781a738b54b9549c1dabfd7ea3f7ea582514ddec/pkg/tlog/tl.go#L57-L62) interface and using [`tl.WithTL`](https://github.com/docker/attest/blob/781a738b54b9549c1dabfd7ea3f7ea582514ddec/pkg/tlog/tl.go#L37) to set in on a context.
+Alternatively, transparency logging can be disabled when signing by using `SkipTL` in the `SigningOptions`, and when verifying by using `skip_tl` in the options to `attest.verify` in the Rego policy.
+
+# Verification Summary Attestation (VSA)
+
+Verification of attestations can be expensive, especially when the attestations are large.
+For example, an SBOM attestation can be several megabytes in size.
+An alternative to consumers verifying the full attestation is to have a trusted entity verify the attestation and publish a [SLSA Verification Summary Attestation](https://slsa.dev/spec/v1.0/verification_summary) (VSA) to the registry.
+The VSA can then be verified by the consumer without needing to verify the full attestation, as long as the consumer trusts the entity that signed the VSA.
+This is useful when the consumer only needs to know that the attestation was verified by a trusted entity, and does not need to know the details of the attestation.
+
+A useful pattern is to have apply a policy to a third-party image at initial ingress, then publish a VSA when publishing the image to an internal registry to attest that the image complies with the policy.
+The VSA can be verified very quickly, for example in a Kubernetes admission controller.
+
+`attest` always generates a [SLSA VSA](https://slsa.dev/spec/v1.0/verification_summary) when verifying attestations on an image.
+The VSA can be signed and published to the registry using the signing functions mentioned in [Signing Attestations](#signing-attestations).
+
+## Example VSA
+
+```json
+{
+  "_type": "https://in-toto.io/Statement/v1",
+  "subject": [
+    {
+      "name": "pkg:docker/example.org/example-image@1.0?platform=linux%2Famd64",
+      "digest": {
+        "sha256": "49f717386e5462e945232569a97a05831cb83bef8c3369be3bb7ea1793686960"
+      }
+    }
+  ],
+  "predicateType": "https://slsa.dev/verification_summary/v1",
+  "predicate": {
+    "verifier": {
+      "id": "https://example.org/internal-verifier"
+    },
+    "timeVerified": "2024-04-19T08:00:00.01Z",
+    "resourceUri": "pkg:docker/example.org/example-image@1.0?platform=linux%2Famd64&digest=sha256%3A49f717386e5462e945232569a97a05831cb83bef8c3369be3bb7ea1793686960",
+    "policy": {
+      "uri": "https://example.org/internal-policy/v1",
+      "downloadLocation": "https://docker.github.io/tuf-staging/targets/docker/d71d6b8f49fcba1295b16f5394dd5863a14e4277eb663d66d8c48e392509afe0.policy.rego",
+      "digest": {
+        "sha256": "d71d6b8f49fcba1295b16f5394dd5863a14e4277eb663d66d8c48e392509afe0"
+      }
+    },
+    "verificationResult": "PASSED",
+    "verifiedLevels": ["SLSA_BUILD_LEVEL_3"]
+  }
+}
+```
+
+# API Reference
+
+Full API reference can be found at [pkg.go.dev/github.com/docker/attest](https://pkg.go.dev/github.com/docker/attest).
+
+# Project Layout
+
+- [pkg/](https://pkg.go.dev/github.com/docker/image-signer-verifier/pkg) => packages that are okay to import for other projects
+- [internal/](https://pkg.go.dev/github.com/docker/image-signer-verifier/pkg) => packages that are only for project internal purposes
+- [scripts/](scripts/) => build scripts
+- [test/](test/) => data for use in tests
+
+# Versioning
+
+`attest` uses [Semantic Versioning](https://semver.org/).
+As such, until `attest` reaches version 1.0.0, breaking changes may be introduced in minor versions.
+
+> Anything MAY change at any time. The public API SHOULD NOT be considered stable.

attestation/README.md

@@ -0,0 +1,4 @@
+## attestations
+This package is for components that deal with the creation, storage, and retrieval of signed attestions using OCI. 
+
+For more generic OCI components see the `oci` package.

attestation/attestation.go

@@ -0,0 +1,444 @@
+package attestation
+
+import (
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"maps"
+	"strings"
+
+	"github.com/docker/attest/oci"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/empty"
+	"github.com/google/go-containerregistry/pkg/v1/layout"
+	"github.com/google/go-containerregistry/pkg/v1/match"
+	"github.com/google/go-containerregistry/pkg/v1/mutate"
+	"github.com/google/go-containerregistry/pkg/v1/partial"
+	"github.com/google/go-containerregistry/pkg/v1/static"
+	"github.com/google/go-containerregistry/pkg/v1/types"
+	intoto "github.com/in-toto/in-toto-golang/in_toto"
+	"github.com/secure-systems-lab/go-securesystemslib/dsse"
+)
+
+// NewManifest creates a new attestation manifest from a descriptor.
+func NewManifest(subject *v1.Descriptor) (*Manifest, error) {
+	return &Manifest{
+		OriginalDescriptor: &v1.Descriptor{
+			MediaType: "application/vnd.oci.image.manifest.v1+json",
+		},
+		OriginalLayers:    []*Layer{},
+		SubjectDescriptor: subject,
+	}, nil
+}
+
+// ManifestsFromIndex extracts all attestation manifests from an index.
+func ManifestsFromIndex(index v1.ImageIndex) ([]*Manifest, error) {
+	idx, err := index.IndexManifest()
+	if err != nil {
+		return nil, fmt.Errorf("failed to extract IndexManifest from ImageIndex: %w", err)
+	}
+	subjects := make(map[string]*v1.Descriptor)
+	for i := range idx.Manifests {
+		subject := &idx.Manifests[i]
+		subjects[subject.Digest.String()] = subject
+	}
+
+	var attestationManifests []*Manifest
+	for i := range idx.Manifests {
+		desc := idx.Manifests[i]
+		if desc.Annotations[DockerReferenceType] == AttestationManifestType {
+			subject := subjects[desc.Annotations[DockerReferenceDigest]]
+			if subject == nil {
+				return nil, fmt.Errorf("failed to find subject for attestation manifest: %w", err)
+			}
+			attestationImage, err := index.Image(desc.Digest)
+			if err != nil {
+				return nil, fmt.Errorf("failed to extract attestation image with digest %s: %w", desc.Digest.String(), err)
+			}
+			attestationLayers, err := layersFromImage(attestationImage)
+			if err != nil {
+				return nil, fmt.Errorf("failed to get attestations from image: %w", err)
+			}
+			attestationManifests = append(attestationManifests,
+				&Manifest{
+					OriginalDescriptor: &desc,
+					SubjectDescriptor:  subject,
+					OriginalLayers:     attestationLayers,
+				})
+		}
+	}
+	return attestationManifests, nil
+}
+
+// LayersFromImage extracts all attestation layers from an image.
+func layersFromImage(image v1.Image) ([]*Layer, error) {
+	layers, err := image.Layers()
+	if err != nil {
+		return nil, fmt.Errorf("failed to extract layers from image: %w", err)
+	}
+	var attestationLayers []*Layer
+	for _, layer := range layers {
+		// parse layer blob as json
+		r, err := layer.Uncompressed()
+		if err != nil {
+			return nil, fmt.Errorf("failed to get layer contents: %w", err)
+		}
+		defer r.Close()
+		mt, err := layer.MediaType()
+		if err != nil {
+			return nil, fmt.Errorf("failed to get layer media type: %w", err)
+		}
+		layerDesc, err := partial.Descriptor(layer)
+		if err != nil {
+			return nil, fmt.Errorf("failed to get descriptor for layer: %w", err)
+		}
+		// copy original annotations
+		ann := maps.Clone(layerDesc.Annotations)
+		// only decode intoto statements
+		stmt := new(intoto.Statement)
+		if mt == types.MediaType(intoto.PayloadType) {
+			err = json.NewDecoder(r).Decode(&stmt)
+			if err != nil {
+				return nil, fmt.Errorf("failed to decode statement layer contents: %w", err)
+			}
+		}
+		attestationLayers = append(attestationLayers, &Layer{Layer: layer, Statement: stmt, Annotations: ann})
+	}
+	return attestationLayers, nil
+}
+
+func (manifest *Manifest) Add(ctx context.Context, signer dsse.SignerVerifier, statement *intoto.Statement, opts *SigningOptions) error {
+	layer, err := createSignedImageLayer(ctx, statement, signer, opts)
+	if err != nil {
+		return fmt.Errorf("failed to create signed layer: %w", err)
+	}
+	manifest.SignedLayers = append(manifest.SignedLayers, layer)
+	return nil
+}
+
+func createSignedImageLayer(ctx context.Context, statement *intoto.Statement, signer dsse.SignerVerifier, opts *SigningOptions) (*Layer, error) {
+	// sign the statement
+	env, err := signInTotoStatement(ctx, statement, signer, opts)
+	if err != nil {
+		return nil, fmt.Errorf("failed to sign statement: %w", err)
+	}
+
+	mediaType, err := DSSEMediaType(statement.PredicateType)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get DSSE media type: %w", err)
+	}
+	data, err := json.Marshal(env)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal envelope: %w", err)
+	}
+	return &Layer{
+		Statement: statement,
+		Annotations: map[string]string{
+			InTotoPredicateType:           statement.PredicateType,
+			InTotoReferenceLifecycleStage: LifecycleStageExperimental,
+		},
+		Layer: static.NewLayer(data, types.MediaType(mediaType)),
+	}, nil
+}
+
+func signInTotoStatement(ctx context.Context, statement *intoto.Statement, signer dsse.SignerVerifier, opts *SigningOptions) (*Envelope, error) {
+	payload, err := json.Marshal(statement)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal statement: %w", err)
+	}
+	env, err := SignDSSE(ctx, payload, signer, opts)
+	if err != nil {
+		return nil, fmt.Errorf("failed to sign statement: %w", err)
+	}
+	return env, nil
+}
+
+func updateImageIndex(
+	idx v1.ImageIndex,
+	manifest *Manifest,
+	options ...func(*ManifestImageOptions) error,
+) (v1.ImageIndex, error) {
+	image, err := manifest.BuildImage(options...)
+	if err != nil {
+		return nil, fmt.Errorf("failed to build image: %w", err)
+	}
+	newDesc, err := partial.Descriptor(image)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get descriptor: %w", err)
+	}
+	newDesc.Platform = &v1.Platform{
+		Architecture: "unknown",
+		OS:           "unknown",
+	}
+	newDesc.MediaType = manifest.OriginalDescriptor.MediaType
+	newDesc.Annotations = manifest.OriginalDescriptor.Annotations
+	idx = mutate.RemoveManifests(idx, match.Digests(manifest.OriginalDescriptor.Digest))
+	idx = mutate.AppendManifests(idx, mutate.IndexAddendum{
+		Add:        image,
+		Descriptor: *newDesc,
+	})
+	return idx, nil
+}
+
+func UpdateIndexImages(idx v1.ImageIndex, manifest []*Manifest, options ...func(*ManifestImageOptions) error) (v1.ImageIndex, error) {
+	var err error
+	for _, m := range manifest {
+		idx, err = updateImageIndex(idx, m, options...)
+		if err != nil {
+			return nil, fmt.Errorf("failed to add image to index: %w", err)
+		}
+	}
+	return idx, nil
+}
+
+func newOptions(options ...func(*ManifestImageOptions) error) (*ManifestImageOptions, error) {
+	opts := &ManifestImageOptions{}
+	for _, opt := range options {
+		err := opt(opts)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return opts, nil
+}
+
+func WithoutSubject(skipSubject bool) func(*ManifestImageOptions) error {
+	return func(r *ManifestImageOptions) error {
+		r.skipSubject = skipSubject
+		return nil
+	}
+}
+
+func WithReplacedLayers(replaceLayers bool) func(*ManifestImageOptions) error {
+	return func(r *ManifestImageOptions) error {
+		r.replaceLayers = replaceLayers
+		return nil
+	}
+}
+
+// build an image with signed attestations, optionally replacing existing layers with signed layers.
+func (manifest *Manifest) BuildImage(options ...func(*ManifestImageOptions) error) (v1.Image, error) {
+	opts, err := newOptions(options...)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create options: %w", err)
+	}
+	resultLayers := manifest.SignedLayers
+	for _, existingLayer := range manifest.OriginalLayers {
+		var found bool
+		for _, signedLayer := range manifest.SignedLayers {
+			if existingLayer.Statement == signedLayer.Statement {
+				found = true
+				// copy over original annotations
+				for k, v := range existingLayer.Annotations {
+					signedLayer.Annotations[k] = v
+				}
+				break
+			}
+		}
+		// add existing layers if they've not been signed or we're not replacing them
+		if !found || !opts.replaceLayers {
+			resultLayers = append(resultLayers, existingLayer)
+		}
+	}
+	// so that we attach all attestations to a single attestations image - as per current buildkit
+	opts.laxReferrers = true
+	newImg, err := buildImageFromLayers(resultLayers, manifest.OriginalDescriptor, manifest.SubjectDescriptor, opts)
+	if err != nil {
+		return nil, fmt.Errorf("failed to build image: %w", err)
+	}
+	return newImg, nil
+}
+
+// build an image per attestation (layer) suitable for use as Referrers.
+func (manifest *Manifest) BuildReferringArtifacts() ([]v1.Image, error) {
+	var images []v1.Image
+	for _, layer := range manifest.SignedLayers {
+		opts := &ManifestImageOptions{}
+		newImg, err := buildImageFromLayers([]*Layer{layer}, manifest.OriginalDescriptor, manifest.SubjectDescriptor, opts)
+		if err != nil {
+			return nil, fmt.Errorf("failed to build image: %w", err)
+		}
+		images = append(images, newImg)
+	}
+	return images, nil
+}
+
+// build an image containing only layers provided.
+func buildImageFromLayers(layers []*Layer, manifest *v1.Descriptor, subject *v1.Descriptor, opts *ManifestImageOptions) (v1.Image, error) {
+	newImg := empty.Image
+	var err error
+	if len(layers) == 0 {
+		return nil, fmt.Errorf("no layers supplied to build image")
+	}
+	// NB: if we add the subject before the layers, it does not end up being computed/serialized in the output for some reason
+	// TODO - recreate this bug and push upstream
+	for _, layer := range layers {
+		add := mutate.Addendum{
+			Layer:       layer.Layer,
+			Annotations: layer.Annotations,
+		}
+		newImg, err = mutate.Append(newImg, add)
+		if err != nil {
+			return nil, fmt.Errorf("failed to add layer to image: %w", err)
+		}
+	}
+
+	// this is for attaching attestations to an attestation image in the index
+	if opts.laxReferrers {
+		newImg = mutate.ConfigMediaType(newImg, "application/vnd.oci.image.config.v1+json")
+	} else {
+		dsseMediatType, err := DSSEMediaType(layers[0].Statement.PredicateType)
+		if err != nil {
+			return nil, fmt.Errorf("failed to get DSSE media type: %w", err)
+		}
+		newImg = mutate.ArtifactType(newImg, dsseMediatType)
+		newImg = mutate.ConfigMediaType(newImg, "application/vnd.oci.empty.v1+json")
+	}
+	// we need to set this even when we set the artifact type otherwise things break (even the go-container-registry client)
+	// even though it's allowed to be empty by spec when setting artifact type
+	newImg = mutate.MediaType(newImg, manifest.MediaType)
+
+	// see note above - must be added after the layers!
+	if !opts.skipSubject {
+		subject.Platform = nil
+		ok := false
+		newImg, ok = mutate.Subject(newImg, *subject).(v1.Image)
+		if !ok {
+			return nil, fmt.Errorf("failed to set subject: %w", err)
+		}
+	}
+	if !opts.laxReferrers {
+		// as per https://github.com/opencontainers/image-spec/blob/main/manifest.md#guidance-for-an-empty-descriptor
+		newImg = &oci.EmptyConfigImage{Image: newImg}
+	}
+	return newImg, nil
+}
+
+func ExtractEnvelopes(manifest *Manifest, predicateType string) ([]*Envelope, error) {
+	var envs []*Envelope
+	dsseMediaType, err := DSSEMediaType(predicateType)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get DSSE media type for predicate '%s': %w", predicateType, err)
+	}
+	for _, attestationLayer := range manifest.OriginalLayers {
+		mt, err := attestationLayer.Layer.MediaType()
+		if err != nil {
+			return nil, fmt.Errorf("failed to get layer media type: %w", err)
+		}
+		if string(mt) == dsseMediaType {
+			reader, err := attestationLayer.Layer.Uncompressed()
+			if err != nil {
+				return nil, fmt.Errorf("failed to get layer contents: %w", err)
+			}
+			defer reader.Close()
+			env := new(Envelope)
+			err = json.NewDecoder(reader).Decode(&env)
+			if err != nil {
+				return nil, fmt.Errorf("failed to decode envelope: %w", err)
+			}
+			envs = append(envs, env)
+		}
+	}
+
+	return envs, nil
+}
+
+func ExtractStatementsFromIndex(idx v1.ImageIndex, mediaType string) ([]*AnnotatedStatement, error) {
+	mfs2, err := idx.IndexManifest()
+	if err != nil {
+		return nil, fmt.Errorf("failed to extract IndexManifest from ImageIndex: %w", err)
+	}
+
+	var statements []*AnnotatedStatement
+
+	for i := range mfs2.Manifests {
+		mf := &mfs2.Manifests[i]
+		if mf.Annotations[DockerReferenceType] != "attestation-manifest" {
+			continue
+		}
+
+		attestationImage, err := idx.Image(mf.Digest)
+		if err != nil {
+			return nil, fmt.Errorf("failed to extract attestation image with digest %s: %w", mf.Digest.String(), err)
+		}
+		layers, err := attestationImage.Layers()
+		if err != nil {
+			return nil, fmt.Errorf("failed to extract layers from attestation image: %w", err)
+		}
+
+		for _, layer := range layers {
+			// parse layer blob as json
+			mt, err := layer.MediaType()
+			if err != nil {
+				return nil, fmt.Errorf("failed to get layer media type: %w", err)
+			}
+
+			if string(mt) != mediaType {
+				continue
+			}
+			r, err := layer.Uncompressed()
+			if err != nil {
+				return nil, fmt.Errorf("failed to get layer contents: %w", err)
+			}
+			defer r.Close()
+			inTotoStatement := new(intoto.Statement)
+			var desc *v1.Descriptor
+			if strings.HasSuffix(string(mt), "+dsse") {
+				env := new(Envelope)
+				err = json.NewDecoder(r).Decode(env)
+				if err != nil {
+					return nil, fmt.Errorf("failed to decode env: %w", err)
+				}
+				payload, err := base64.StdEncoding.Strict().DecodeString(env.Payload)
+				if err != nil {
+					return nil, fmt.Errorf("failed to decode payload: %w", err)
+				}
+				err = json.Unmarshal([]byte(payload), inTotoStatement)
+				if err != nil {
+					return nil, fmt.Errorf("failed to decode %s statement: %w", mediaType, err)
+				}
+			} else {
+				desc := new(v1.Descriptor)
+				err = json.NewDecoder(r).Decode(desc)
+				if err != nil {
+					return nil, fmt.Errorf("failed to decode statement: %w", err)
+				}
+			}
+
+			layerDesc, err := partial.Descriptor(layer)
+			if err != nil {
+				return nil, fmt.Errorf("failed to get descriptor for layer: %w", err)
+			}
+			annotations := make(map[string]string)
+			for k, v := range layerDesc.Annotations {
+				annotations[k] = v
+			}
+			statements = append(statements, &AnnotatedStatement{
+				OCIDescriptor:   desc,
+				InTotoStatement: inTotoStatement,
+				Annotations:     annotations,
+			})
+		}
+	}
+	return statements, nil
+}
+
+func ExtractAnnotatedStatements(path string, mediaType string) ([]*AnnotatedStatement, error) {
+	idx, err := layout.ImageIndexFromPath(path)
+	if err != nil {
+		return nil, fmt.Errorf("failed to load image index: %w", err)
+	}
+
+	idxm, err := idx.IndexManifest()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get digest: %w", err)
+	}
+	idxDigest := idxm.Manifests[0].Digest
+
+	mfs, err := idx.ImageIndex(idxDigest)
+	if err != nil {
+		return nil, fmt.Errorf("failed to extract ImageIndex for digest %s: %w", idxDigest.String(), err)
+	}
+	return ExtractStatementsFromIndex(mfs, mediaType)
+}

attestation/attestation_test.go

@@ -1,23 +1,18 @@
-package test
+package attestation_test
 
 import (
-	"path/filepath"
 	"testing"
 
+	"github.com/docker/attest/attestation"
+	"github.com/docker/attest/internal/test"
 	intoto "github.com/in-toto/in-toto-golang/in_toto"
 	"github.com/stretchr/testify/assert"
 )
 
-var (
-	UnsignedTestImage = filepath.Join("..", "..", "test", "testdata", "unsigned-test-image")
-)
-
-const (
-	ExpectedStatements = 4
-)
+const ExpectedStatements = 4
 
 func TestExtractAnnotatedStatements(t *testing.T) {
-	statements, err := ExtractAnnotatedStatements(UnsignedTestImage, intoto.PayloadType)
+	statements, err := attestation.ExtractAnnotatedStatements(test.UnsignedTestImage(".."), intoto.PayloadType)
 	assert.NoError(t, err)
 	assert.Equalf(t, len(statements), ExpectedStatements, "expected %d statement, got %d", ExpectedStatements, len(statements))
 }

attestation/example_attestation_manifest_test.go

@@ -0,0 +1,90 @@
+package attestation_test
+
+import (
+	"context"
+	"time"
+
+	"github.com/docker/attest/attestation"
+	"github.com/docker/attest/oci"
+	"github.com/docker/attest/signerverifier"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	intoto "github.com/in-toto/in-toto-golang/in_toto"
+	"github.com/in-toto/in-toto-golang/in_toto/slsa_provenance/common"
+)
+
+func ExampleManifest() {
+	// configure signerverifier
+	// local signer (unsafe for production)
+	signer, err := signerverifier.GenKeyPair()
+	if err != nil {
+		panic(err)
+	}
+	// example using AWS KMS signer
+	// aws_arn := "arn:aws:kms:us-west-2:123456789012:key/12345678-1234-1234-1234-123456789012"
+	// aws_region := "us-west-2"
+	// signer, err := signerverifier.GetAWSSigner(cmd.Context(), aws_arn, aws_region)
+
+	// configure signing options
+	opts := &attestation.SigningOptions{
+		TransparencyLog: nil, // set this to log to a transparency log
+	}
+
+	ref := "docker/image-signer-verifier:latest"
+
+	digest, err := v1.NewHash("sha256:da8b190665956ea07890a0273e2a9c96bfe291662f08e2860e868eef69c34620")
+	if err != nil {
+		panic(err)
+	}
+	desc := &v1.Descriptor{
+		Digest:    digest,
+		Size:      1234,
+		MediaType: "application/vnd.oci.image.manifest.v1+json",
+	}
+
+	// the in-toto statement to be signed
+	statement := &intoto.Statement{
+		StatementHeader: intoto.StatementHeader{
+			PredicateType: attestation.VSAPredicateType,
+			Subject:       []intoto.Subject{{Name: ref, Digest: common.DigestSet{digest.Algorithm: digest.Hex}}},
+			Type:          intoto.StatementInTotoV01,
+		},
+		Predicate: attestation.VSAPredicate{
+			Verifier: attestation.VSAVerifier{
+				ID: "test-verifier",
+			},
+			TimeVerified:       time.Now().UTC().Format(time.RFC3339),
+			ResourceURI:        "some-uri",
+			Policy:             attestation.VSAPolicy{URI: "some-uri"},
+			VerificationResult: "PASSED",
+			VerifiedLevels:     []string{"SLSA_BUILD_LEVEL_1"},
+		},
+	}
+
+	// create a new manifest to hold the attestation
+	manifest, err := attestation.NewManifest(desc)
+	if err != nil {
+		panic(err)
+	}
+
+	// sign and add the attestation to the manifest
+	err = manifest.Add(context.Background(), signer, statement, opts)
+	if err != nil {
+		panic(err)
+	}
+
+	output, err := oci.ParseImageSpecs("docker/image-signer-verifier-referrers:latest")
+	if err != nil {
+		panic(err)
+	}
+
+	// save the manifest to the registry as a referrers artifact
+	artifacts, err := manifest.BuildReferringArtifacts()
+	if err != nil {
+		panic(err)
+	}
+	ctx := context.Background()
+	err = oci.SaveImagesNoTag(ctx, artifacts, output)
+	if err != nil {
+		panic(err)
+	}
+}

attestation/layout.go

@@ -0,0 +1,147 @@
+package attestation
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"github.com/docker/attest/oci"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/layout"
+)
+
+// implementation of Resolver that closes over attestations from an oci layout.
+type LayoutResolver struct {
+	*Manifest
+	*oci.ImageSpec
+}
+
+func NewOCILayoutResolver(src *oci.ImageSpec) (*LayoutResolver, error) {
+	r := &LayoutResolver{
+		ImageSpec: src,
+	}
+	_, err := r.fetchManifest()
+	if err != nil {
+		return nil, err
+	}
+	return r, nil
+}
+
+func (r *LayoutResolver) fetchManifest() (*Manifest, error) {
+	if r.Manifest == nil {
+		m, err := manifestFromOCILayout(r.Identifier, r.ImageSpec.Platform)
+		if err != nil {
+			return nil, err
+		}
+		r.Manifest = m
+	}
+
+	return r.Manifest, nil
+}
+
+func (r *LayoutResolver) Attestations(_ context.Context, predicateType string) ([]*Envelope, error) {
+	var envs []*Envelope
+	dsseMediaType, err := DSSEMediaType(predicateType)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get DSSE media type for predicate '%s': %w", predicateType, err)
+	}
+	for _, attestationLayer := range r.Manifest.OriginalLayers {
+		mt, err := attestationLayer.Layer.MediaType()
+		if err != nil {
+			return nil, fmt.Errorf("failed to get layer media type: %w", err)
+		}
+		mts := string(mt)
+		if mts != dsseMediaType {
+			continue
+		}
+		env := new(Envelope)
+		// parse layer blob as json
+		r, err := attestationLayer.Layer.Uncompressed()
+		if err != nil {
+			return nil, fmt.Errorf("failed to get layer contents: %w", err)
+		}
+		defer r.Close()
+		err = json.NewDecoder(r).Decode(env)
+		if err != nil {
+			return nil, fmt.Errorf("failed to decode envelope: %w", err)
+		}
+		envs = append(envs, env)
+	}
+	return envs, nil
+}
+
+func (r *LayoutResolver) ImageName(_ context.Context) (string, error) {
+	return r.SubjectName, nil
+}
+
+func (r *LayoutResolver) ImageDescriptor(_ context.Context) (*v1.Descriptor, error) {
+	return r.SubjectDescriptor, nil
+}
+
+func (r *LayoutResolver) ImagePlatform(_ context.Context) (*v1.Platform, error) {
+	return r.ImageSpec.Platform, nil
+}
+
+func manifestFromOCILayout(path string, platform *v1.Platform) (*Manifest, error) {
+	idx, err := layout.ImageIndexFromPath(path)
+	if err != nil {
+		return nil, err
+	}
+
+	idxm, err := idx.IndexManifest()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get digest: %w", err)
+	}
+
+	idxDescriptor := idxm.Manifests[0]
+	idxDigest := idxDescriptor.Digest
+
+	mfs, err := idx.ImageIndex(idxDigest)
+	if err != nil {
+		return nil, fmt.Errorf("failed to extract ImageIndex for digest %s: %w", idxDigest.String(), err)
+	}
+	mfs2, err := mfs.IndexManifest()
+	if err != nil {
+		return nil, fmt.Errorf("failed to extract IndexManifest from ImageIndex: %w", err)
+	}
+	var subjectDescriptor *v1.Descriptor
+	for i := range mfs2.Manifests {
+		manifest := &mfs2.Manifests[i]
+		if manifest.Platform != nil {
+			if manifest.Platform.Equals(*platform) {
+				subjectDescriptor = manifest
+				break
+			}
+		}
+	}
+	if subjectDescriptor == nil {
+		return nil, fmt.Errorf("platform not found in index")
+	}
+	for i := range mfs2.Manifests {
+		mf := &mfs2.Manifests[i]
+		if mf.Annotations[DockerReferenceType] != AttestationManifestType {
+			continue
+		}
+
+		if mf.Annotations[DockerReferenceDigest] != subjectDescriptor.Digest.String() {
+			continue
+		}
+
+		attestationImage, err := mfs.Image(mf.Digest)
+		if err != nil {
+			return nil, fmt.Errorf("failed to extract attestation image with digest %s: %w", mf.Digest.String(), err)
+		}
+		layers, err := layersFromImage(attestationImage)
+		if err != nil {
+			return nil, fmt.Errorf("failed to get attestations from image: %w", err)
+		}
+		attest := &Manifest{
+			OriginalLayers:     layers,
+			OriginalDescriptor: mf,
+			SubjectName:        idxDescriptor.Annotations["org.opencontainers.image.ref.name"],
+			SubjectDescriptor:  subjectDescriptor,
+		}
+		return attest, nil
+	}
+	return nil, fmt.Errorf("attestation manifest not found")
+}

attestation/layout_test.go

@@ -0,0 +1,68 @@
+package attestation_test
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/docker/attest"
+	"github.com/docker/attest/attestation"
+	"github.com/docker/attest/internal/test"
+	"github.com/docker/attest/oci"
+	"github.com/docker/attest/policy"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestAttestationFromOCILayout(t *testing.T) {
+	ctx, signer := test.Setup(t)
+	outputLayout := test.CreateTempDir(t, "", "attest-oci-layout")
+
+	invalidPlatform := &v1.Platform{
+		Architecture: "invalid",
+		OS:           "invalid",
+	}
+
+	opts := &attestation.SigningOptions{}
+	attIdx, err := oci.IndexFromPath(test.UnsignedTestImage(".."))
+	require.NoError(t, err)
+	signedManifests, err := attest.SignStatements(ctx, attIdx.Index, signer, opts)
+	require.NoError(t, err)
+	signedIndex := attIdx.Index
+	signedIndex, err = attestation.UpdateIndexImages(signedIndex, signedManifests)
+	require.NoError(t, err)
+	spec, err := oci.ParseImageSpec(oci.LocalPrefix + outputLayout)
+	require.NoError(t, err)
+	err = oci.SaveIndex(ctx, []*oci.ImageSpec{spec}, signedIndex, outputLayout)
+	require.NoError(t, err)
+
+	testCases := []struct {
+		name     string
+		platform *v1.Platform
+		errorStr string
+	}{
+		{name: "nominal", platform: spec.Platform},
+		{name: "invalid platform", platform: invalidPlatform, errorStr: "platform not found in index"},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			spec := &oci.ImageSpec{
+				Type:       oci.OCI,
+				Identifier: outputLayout,
+				Platform:   tc.platform,
+			}
+			resolver, err := policy.CreateImageDetailsResolver(spec)
+			if tc.errorStr != "" {
+				require.Error(t, err)
+				assert.Contains(t, err.Error(), tc.errorStr)
+				return
+			}
+			require.NoError(t, err)
+			desc, err := resolver.ImageDescriptor(ctx)
+			require.NoError(t, err)
+			digest := desc.Digest.String()
+			assert.True(t, strings.Contains(digest, "sha256:"))
+		})
+	}
+}

attestation/mock.go

@@ -0,0 +1,69 @@
+package attestation
+
+import (
+	"context"
+
+	"github.com/docker/attest/oci"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+)
+
+// ensure MockResolver implements Resolver.
+var _ oci.ImageDetailsResolver = MockResolver{}
+
+type MockResolver struct {
+	Envs         []*Envelope
+	Image        string
+	PlatformFn   func() (*v1.Platform, error)
+	DescriptorFn func() (*v1.Descriptor, error)
+	ImangeNameFn func() (string, error)
+}
+
+func (r MockResolver) Attestations(_ context.Context, _ string) ([]*Envelope, error) {
+	return r.Envs, nil
+}
+
+func (r MockResolver) ImageName(_ context.Context) (string, error) {
+	if r.Image != "" {
+		return r.Image, nil
+	}
+	if r.ImangeNameFn != nil {
+		return r.ImangeNameFn()
+	}
+	return "library/alpine:latest", nil
+}
+
+func (r MockResolver) ImageDescriptor(_ context.Context) (*v1.Descriptor, error) {
+	if r.DescriptorFn != nil {
+		return r.DescriptorFn()
+	}
+	digest, err := v1.NewHash("sha256:da8b190665956ea07890a0273e2a9c96bfe291662f08e2860e868eef69c34620")
+	if err != nil {
+		return nil, err
+	}
+	return &v1.Descriptor{
+		Digest:    digest,
+		Size:      1234,
+		MediaType: "application/vnd.oci.image.manifest.v1+json",
+	}, nil
+}
+
+func (r MockResolver) ImagePlatform(_ context.Context) (*v1.Platform, error) {
+	if r.PlatformFn != nil {
+		return r.PlatformFn()
+	}
+	return oci.ParsePlatform("linux/amd64")
+}
+
+type MockRegistryResolver struct {
+	Subject      *v1.Descriptor
+	ImageNameStr string
+	*MockResolver
+}
+
+func (r *MockRegistryResolver) ImageDescriptor(_ context.Context) (*v1.Descriptor, error) {
+	return r.Subject, nil
+}
+
+func (r *MockRegistryResolver) ImageName(_ context.Context) (string, error) {
+	return r.ImageNameStr, nil
+}

attestation/referrers.go

@@ -0,0 +1,126 @@
+package attestation
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/docker/attest/oci"
+	"github.com/google/go-containerregistry/pkg/name"
+	"github.com/google/go-containerregistry/pkg/v1/remote"
+)
+
+// ensure ReferrersResolver implements Resolver.
+var _ Resolver = &ReferrersResolver{}
+
+type ReferrersResolver struct {
+	referrersRepo string
+	oci.ImageDetailsResolver
+}
+
+func NewReferrersResolver(src oci.ImageDetailsResolver, options ...func(*ReferrersResolver) error) (*ReferrersResolver, error) {
+	res := &ReferrersResolver{
+		ImageDetailsResolver: src,
+	}
+	for _, opt := range options {
+		err := opt(res)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return res, nil
+}
+
+func WithReferrersRepo(repo string) func(*ReferrersResolver) error {
+	return func(r *ReferrersResolver) error {
+		r.referrersRepo = repo
+		return nil
+	}
+}
+
+func (r *ReferrersResolver) resolveAttestations(ctx context.Context, predicateType string) ([]*Manifest, error) {
+	dsseMediaType, err := DSSEMediaType(predicateType)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get DSSE media type for predicate '%s': %w", predicateType, err)
+	}
+	imageName, err := r.ImageName(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get image name: %w", err)
+	}
+	subjectRef, err := name.ParseReference(imageName)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse reference: %w", err)
+	}
+	desc, err := r.ImageDescriptor(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get descriptor: %w", err)
+	}
+	subjectDigest := desc.Digest.String()
+	var referrersSubjectRef name.Digest
+	if r.referrersRepo != "" {
+		referrersSubjectRef, err = name.NewDigest(fmt.Sprintf("%s@%s", strings.TrimPrefix(r.referrersRepo, oci.RegistryPrefix), subjectDigest))
+		if err != nil {
+			return nil, fmt.Errorf("failed to create referrers reference: %w", err)
+		}
+	} else {
+		referrersSubjectRef = subjectRef.Context().Digest(subjectDigest)
+	}
+	options := oci.WithOptions(ctx, nil)
+	options = append(options, remote.WithFilter("artifactType", dsseMediaType))
+	referrersIndex, err := remote.Referrers(referrersSubjectRef, options...)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get referrers: %w", err)
+	}
+	referrersIndexManifest, err := referrersIndex.IndexManifest()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get index manifest: %w", err)
+	}
+	aManifests := make([]*Manifest, 0)
+	for i := range referrersIndexManifest.Manifests {
+		m := referrersIndexManifest.Manifests[i]
+		remoteRef := referrersSubjectRef.Context().Digest(m.Digest.String())
+		options = oci.WithOptions(ctx, nil)
+		attestationImage, err := remote.Image(remoteRef, options...)
+		if err != nil {
+			return nil, fmt.Errorf("failed to get referred image: %w", err)
+		}
+		layers, err := layersFromImage(attestationImage)
+		if err != nil {
+			return nil, fmt.Errorf("failed to get attestations from image: %w", err)
+		}
+		if len(layers) != 1 {
+			return nil, fmt.Errorf("expected exactly one layer, got %d", len(layers))
+		}
+		mt, err := layers[0].Layer.MediaType()
+		if err != nil {
+			return nil, fmt.Errorf("failed to get layer media type: %w", err)
+		}
+		if string(mt) != dsseMediaType {
+			return nil, fmt.Errorf("expected layer media type %s, got %s", dsseMediaType, mt)
+		}
+		attest := &Manifest{
+			SubjectName:        imageName,
+			OriginalLayers:     layers,
+			OriginalDescriptor: &m,
+			SubjectDescriptor:  desc,
+		}
+		aManifests = append(aManifests, attest)
+	}
+	return aManifests, nil
+}
+
+func (r *ReferrersResolver) Attestations(ctx context.Context, predicateType string) ([]*Envelope, error) {
+	manifests, err := r.resolveAttestations(ctx, predicateType)
+	if err != nil {
+		return nil, fmt.Errorf("failed to resolve attestations: %w", err)
+	}
+	var envs []*Envelope
+	for _, attest := range manifests {
+		es, err := ExtractEnvelopes(attest, predicateType)
+		if err != nil {
+			return nil, fmt.Errorf("failed to extract envelopes: %w", err)
+		}
+		envs = append(envs, es...)
+	}
+	return envs, nil
+}

attestation/referrers_test.go

@@ -0,0 +1,321 @@
+package attestation_test
+
+import (
+	"fmt"
+	"net/http/httptest"
+	"net/url"
+	"path/filepath"
+	"testing"
+
+	"github.com/docker/attest"
+	"github.com/docker/attest/attestation"
+	"github.com/docker/attest/internal/test"
+	"github.com/docker/attest/mapping"
+	"github.com/docker/attest/oci"
+	"github.com/docker/attest/policy"
+	"github.com/google/go-containerregistry/pkg/name"
+	"github.com/google/go-containerregistry/pkg/registry"
+	"github.com/google/go-containerregistry/pkg/v1/remote"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+var (
+	NoProvenanceImage   = filepath.Join("..", "test", "testdata", "no-provenance-image")
+	PassPolicyDir       = filepath.Join("..", "test", "testdata", "local-policy-pass")
+	LocalPolicy         = filepath.Join("..", "test", "testdata", "local-policy")
+	LocalPolicyAttached = filepath.Join("..", "test", "testdata", "local-policy-attached")
+	PassNoTLPolicyDir   = filepath.Join("..", "test", "testdata", "local-policy-no-tl")
+	FailPolicyDir       = filepath.Join("..", "test", "testdata", "local-policy-fail")
+	TestTempDir         = "attest-sign-test"
+)
+
+func TestAttestationReferenceTypes(t *testing.T) {
+	ctx, signer := test.Setup(t)
+	platforms := []string{"linux/amd64", "linux/arm64"}
+	for _, tc := range []struct {
+		name              string
+		server            *httptest.Server
+		referrersServer   *httptest.Server
+		useDigest         bool
+		referrersRepo     string
+		attestationSource mapping.AttestationStyle
+		expectFailure     bool
+	}{
+		{
+			name:   "referrers support, defaults",
+			server: test.NewLocalRegistry(ctx, registry.WithReferrersSupport(true)),
+		},
+		{
+			name:      "use digest",
+			server:    test.NewLocalRegistry(ctx, registry.WithReferrersSupport(true)),
+			useDigest: true,
+		},
+		{
+			name:              "attached attestations, referrers repo (mismatched args)",
+			server:            test.NewLocalRegistry(ctx, registry.WithReferrersSupport(true)),
+			expectFailure:     true, // mismatched args
+			attestationSource: mapping.AttestationStyleAttached,
+			referrersRepo:     "referrers",
+		},
+		{
+			name:              "referrers attestations, referrers repo (no policy)",
+			server:            test.NewLocalRegistry(ctx, registry.WithReferrersSupport(true)),
+			expectFailure:     true, // no policy
+			attestationSource: mapping.AttestationStyleReferrers,
+			referrersRepo:     "referrers",
+		},
+		{
+			name:              "referrers attestations",
+			server:            test.NewLocalRegistry(ctx, registry.WithReferrersSupport(true)),
+			attestationSource: mapping.AttestationStyleReferrers,
+		},
+		{
+			name:   "referrers attestations, no referrers support on server",
+			server: test.NewLocalRegistry(ctx, registry.WithReferrersSupport(false)),
+
+			attestationSource: mapping.AttestationStyleReferrers,
+			referrersServer:   test.NewLocalRegistry(ctx, registry.WithReferrersSupport(true)),
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			s := tc.server
+			defer s.Close()
+
+			if tc.referrersServer != nil {
+				defer tc.referrersServer.Close()
+			}
+			u, err := url.Parse(s.URL)
+			require.NoError(t, err)
+
+			opts := &attestation.SigningOptions{}
+			attIdx, err := oci.IndexFromPath(test.UnsignedTestImage(".."))
+			require.NoError(t, err)
+
+			indexName := fmt.Sprintf("%s/repo:root", u.Host)
+			require.NoError(t, err)
+
+			outputRepo := indexName
+			if tc.referrersServer != nil {
+				ru, err := url.Parse(s.URL)
+				require.NoError(t, err)
+				tc.referrersRepo = fmt.Sprintf("%s/referrers", ru.Host)
+				outputRepo = tc.referrersRepo
+			}
+			// sign all the statements in the index
+			signedManifests, err := attest.SignStatements(ctx, attIdx.Index, signer, opts)
+			require.NoError(t, err)
+
+			// push subject image so that it can be resolved
+			require.NoError(t, err)
+			err = oci.PushIndexToRegistry(ctx, attIdx.Index, indexName)
+			require.NoError(t, err)
+
+			// upload referrers
+			output, err := oci.ParseImageSpec(outputRepo)
+			require.NoError(t, err)
+			for _, attIdx := range signedManifests {
+				images, err := attIdx.BuildReferringArtifacts()
+				require.NoError(t, err)
+				err = oci.SaveImagesNoTag(ctx, images, []*oci.ImageSpec{output})
+				require.NoError(t, err)
+			}
+
+			for _, platform := range platforms {
+				// can eval policy in the normal way
+				ref := indexName
+				if tc.useDigest {
+					options := oci.WithOptions(ctx, nil)
+					subjectRef, err := name.ParseReference(indexName)
+					require.NoError(t, err)
+					desc, err := remote.Index(subjectRef, options...)
+					require.NoError(t, err)
+					idxDigest, err := desc.Digest()
+					require.NoError(t, err)
+					ref = fmt.Sprintf("%s/repo@%s", u.Host, idxDigest.String())
+				}
+
+				policyOpts := &policy.Options{
+					LocalPolicyDir: LocalPolicy,
+					DisableTUF:     true,
+				}
+
+				if tc.referrersRepo != "" {
+					policyOpts.ReferrersRepo = tc.referrersRepo
+				}
+
+				if tc.attestationSource != "" {
+					policyOpts.AttestationStyle = tc.attestationSource
+				}
+				src, err := oci.ParseImageSpec(ref, oci.WithPlatform(platform))
+				require.NoError(t, err)
+				results, err := attest.Verify(ctx, src, policyOpts)
+				if tc.expectFailure {
+					require.Error(t, err)
+					continue
+				}
+				require.NoError(t, err)
+				assert.Equal(t, attest.OutcomeSuccess, results.Outcome)
+
+				if tc.useDigest {
+					p, err := oci.ParsePlatform(platform)
+					require.NoError(t, err)
+					options := oci.WithOptions(ctx, p)
+					subjectRef, err := name.ParseReference(indexName)
+					require.NoError(t, err)
+					desc, err := remote.Image(subjectRef, options...)
+					require.NoError(t, err)
+					subjectDigest, err := desc.Digest()
+					require.NoError(t, err)
+					ref = fmt.Sprintf("%s/repo@%s", u.Host, subjectDigest.String())
+				}
+				src, err = oci.ParseImageSpec(ref, oci.WithPlatform(platform))
+				require.NoError(t, err)
+				results, err = attest.Verify(ctx, src, policyOpts)
+				require.NoError(t, err)
+				assert.Equal(t, attest.OutcomeSuccess, results.Outcome)
+			}
+		})
+	}
+}
+
+func TestReferencesInDifferentRepo(t *testing.T) {
+	ctx, signer := test.Setup(t)
+	repoName := "repo"
+	for _, tc := range []struct {
+		name      string
+		server    *httptest.Server
+		refServer *httptest.Server
+	}{
+		{
+			name:      "referrers support",
+			server:    test.NewLocalRegistry(ctx, registry.WithReferrersSupport(true)),
+			refServer: test.NewLocalRegistry(ctx, registry.WithReferrersSupport(true)),
+		},
+		{
+			name:      "no referrers support",
+			server:    test.NewLocalRegistry(ctx, registry.WithReferrersSupport(false)),
+			refServer: test.NewLocalRegistry(ctx, registry.WithReferrersSupport(true)),
+		},
+	} {
+		server := tc.server
+		defer server.Close()
+		serverURL, err := url.Parse(server.URL)
+		require.NoError(t, err)
+
+		refServer := tc.refServer
+		defer refServer.Close()
+		refServerURL, err := url.Parse(refServer.URL)
+		require.NoError(t, err)
+
+		opts := &attestation.SigningOptions{}
+		attIdx, err := oci.IndexFromPath(test.UnsignedTestImage(".."))
+		require.NoError(t, err)
+
+		indexName := fmt.Sprintf("%s/%s:latest", serverURL.Host, repoName)
+		err = oci.PushIndexToRegistry(ctx, attIdx.Index, indexName)
+		require.NoError(t, err)
+
+		signedManifests, err := attest.SignStatements(ctx, attIdx.Index, signer, opts)
+		require.NoError(t, err)
+
+		// push signed attestation image to the ref server
+		for _, signedManifest := range signedManifests {
+			// push references using subject-digest.att convention
+			image, err := signedManifest.BuildImage()
+			require.NoError(t, err)
+			err = oci.PushImageToRegistry(ctx, image, fmt.Sprintf("%s/%s:tag-does-not-matter", refServerURL.Host, repoName))
+			require.NoError(t, err)
+
+			refServer := tc.refServer
+			defer refServer.Close()
+			refServerURL, err := url.Parse(refServer.URL)
+			require.NoError(t, err)
+
+			opts := &attestation.SigningOptions{}
+			attIdx, err := oci.IndexFromPath(test.UnsignedTestImage(".."))
+			require.NoError(t, err)
+
+			indexName := fmt.Sprintf("%s/%s:latest", serverURL.Host, repoName)
+			err = oci.PushIndexToRegistry(ctx, attIdx.Index, indexName)
+			require.NoError(t, err)
+
+			signedManifests, err := attest.SignStatements(ctx, attIdx.Index, signer, opts)
+			require.NoError(t, err)
+
+			// push signed attestation image to the ref server
+			for _, mf := range signedManifests {
+				// push references using subject-digest.att convention
+				imgs, err := mf.BuildReferringArtifacts()
+				require.NoError(t, err)
+				for _, img := range imgs {
+					err = oci.PushImageToRegistry(ctx, img, fmt.Sprintf("%s/%s:tag-does-not-matter", refServerURL.Host, repoName))
+					require.NoError(t, err)
+				}
+			}
+			mfs2, err := attIdx.Index.IndexManifest()
+			require.NoError(t, err)
+			for _, mf := range mfs2.Manifests {
+				// skip signed/unsigned attestations
+				if mf.Annotations[attestation.DockerReferenceType] == attestation.AttestationManifestType {
+					continue
+				}
+				// can evaluate policy using referrers in a different repo
+				referencedImage := fmt.Sprintf("%s@%s", indexName, mf.Digest.String())
+				policyOpts := &policy.Options{
+					LocalPolicyDir: PassPolicyDir,
+					DisableTUF:     true,
+				}
+				src, err := oci.ParseImageSpec(referencedImage)
+				require.NoError(t, err)
+				results, err := attest.Verify(ctx, src, policyOpts)
+				require.NoError(t, err)
+				assert.Equal(t, attest.OutcomeSuccess, results.Outcome)
+			}
+		}
+	}
+}
+
+func TestCorrectArtifactTypeInTagFallback(t *testing.T) {
+	ctx, signer := test.Setup(t)
+	regServer := test.NewLocalRegistry(ctx, registry.WithReferrersSupport(false))
+	defer regServer.Close()
+	serverURL, err := url.Parse(regServer.URL)
+	require.NoError(t, err)
+
+	repoName := "repo"
+
+	opts := &attestation.SigningOptions{}
+	attIdx, err := oci.IndexFromPath(test.UnsignedTestImage(".."))
+	require.NoError(t, err)
+
+	indexName := fmt.Sprintf("%s/%s:latest", serverURL.Host, repoName)
+	err = oci.PushIndexToRegistry(ctx, attIdx.Index, indexName)
+	require.NoError(t, err)
+
+	signedManifests, err := attest.SignStatements(ctx, attIdx.Index, signer, opts)
+	require.NoError(t, err)
+
+	// this should create and maintain an index of referrers
+	for _, mf := range signedManifests {
+		imgs, err := mf.BuildReferringArtifacts()
+		require.NoError(t, err)
+		for _, img := range imgs {
+			err = oci.PushImageToRegistry(ctx, img, fmt.Sprintf("%s/%s:tag-does-not-matter", serverURL.Host, repoName))
+			require.NoError(t, err)
+			mf, err := img.Manifest()
+			require.NoError(t, err)
+			subject := mf.Subject
+			subjectRef, err := name.ParseReference(fmt.Sprintf("%s/%s:sha256-%s", serverURL.Host, repoName, subject.Digest.Hex))
+			require.NoError(t, err)
+			idx, err := remote.Index(subjectRef, oci.WithOptions(ctx, nil)...)
+			require.NoError(t, err)
+			imf, err := idx.IndexManifest()
+			require.NoError(t, err)
+			for _, m := range imf.Manifests {
+				assert.Contains(t, m.ArtifactType, "application/vnd.in-toto")
+				assert.Contains(t, m.ArtifactType, "+dsse")
+			}
+		}
+	}
+}

attestation/registry.go

@@ -0,0 +1,104 @@
+package attestation
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/docker/attest/oci"
+	"github.com/google/go-containerregistry/pkg/name"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/remote"
+)
+
+// ensure RegistryResolver implements Resolver.
+var _ Resolver = &RegistryResolver{}
+
+type RegistryResolver struct {
+	*oci.RegistryImageDetailsResolver
+	*Manifest
+}
+
+func NewRegistryResolver(src *oci.RegistryImageDetailsResolver) (*RegistryResolver, error) {
+	return &RegistryResolver{
+		RegistryImageDetailsResolver: src,
+	}, nil
+}
+
+func (r *RegistryResolver) Attestations(ctx context.Context, predicateType string) ([]*Envelope, error) {
+	if r.Manifest == nil {
+		attest, err := FetchManifest(ctx, r.Identifier, r.ImageSpec.Platform)
+		if err != nil {
+			return nil, err
+		}
+		r.Manifest = attest
+	}
+	return ExtractEnvelopes(r.Manifest, predicateType)
+}
+
+func attestationDigestForImage(ix *v1.IndexManifest, imageDigest string, attestType string) (string, error) {
+	for i := range ix.Manifests {
+		m := &ix.Manifests[i]
+		if v, ok := m.Annotations[DockerReferenceType]; ok && v == attestType {
+			if d, ok := m.Annotations[DockerReferenceDigest]; ok && d == imageDigest {
+				return m.Digest.String(), nil
+			}
+		}
+	}
+	return "", fmt.Errorf("no attestation found for image %s", imageDigest)
+}
+
+func FetchManifest(ctx context.Context, image string, platform *v1.Platform) (*Manifest, error) {
+	// we want to get to the image index, so ignoring platform for now
+	options := oci.WithOptions(ctx, nil)
+	ref, err := name.ParseReference(image)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse reference: %w", err)
+	}
+	index, err := remote.Index(ref, options...)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get index: %w", err)
+	}
+	indexManifest, err := index.IndexManifest()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get index manifest: %w", err)
+	}
+	subjectDescriptor, err := oci.ImageDescriptor(indexManifest, platform)
+	if err != nil {
+		return nil, fmt.Errorf("failed to obtain image for platform: %w", err)
+	}
+
+	digest := subjectDescriptor.Digest.String()
+	ref, err = name.ParseReference(fmt.Sprintf("%s@%s", ref.Context().Name(), digest))
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse attestation reference: %w", err)
+	}
+
+	attestationDigest, err := attestationDigestForImage(indexManifest, digest, "attestation-manifest")
+	if err != nil {
+		return nil, fmt.Errorf("failed to obtain attestation for image: %w", err)
+	}
+	ref, err = name.ParseReference(fmt.Sprintf("%s@%s", ref.Context().Name(), attestationDigest))
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse attestation reference: %w", err)
+	}
+	remoteDescriptor, err := remote.Get(ref, options...)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get attestation: %w", err)
+	}
+	attestationImage, err := remoteDescriptor.Image()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get attestation image: %w", err)
+	}
+
+	layers, err := layersFromImage(attestationImage)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get attestations from image: %w", err)
+	}
+	attest := &Manifest{
+		OriginalLayers:     layers,
+		OriginalDescriptor: &remoteDescriptor.Descriptor,
+		SubjectName:        image,
+		SubjectDescriptor:  subjectDescriptor,
+	}
+	return attest, nil
+}

attestation/registry_test.go

@@ -0,0 +1,49 @@
+package attestation_test
+
+import (
+	"fmt"
+	"net/url"
+	"strings"
+	"testing"
+
+	"github.com/docker/attest"
+	"github.com/docker/attest/attestation"
+	"github.com/docker/attest/internal/test"
+	"github.com/docker/attest/oci"
+	"github.com/docker/attest/policy"
+	"github.com/google/go-containerregistry/pkg/registry"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestRegistry(t *testing.T) {
+	ctx, signer := test.Setup(t)
+	regServer := test.NewLocalRegistry(ctx, registry.WithReferrersSupport(false))
+	defer regServer.Close()
+	u, err := url.Parse(regServer.URL)
+	require.NoError(t, err)
+
+	opts := &attestation.SigningOptions{}
+	attIdx, err := oci.IndexFromPath(test.UnsignedTestImage(".."))
+	require.NoError(t, err)
+	signedManifests, err := attest.SignStatements(ctx, attIdx.Index, signer, opts)
+	require.NoError(t, err)
+	signedIndex := attIdx.Index
+	signedIndex, err = attestation.UpdateIndexImages(signedIndex, signedManifests)
+	require.NoError(t, err)
+
+	indexName := fmt.Sprintf("%s/repo:root", u.Host)
+	require.NoError(t, err)
+	err = oci.PushIndexToRegistry(ctx, signedIndex, indexName)
+	require.NoError(t, err)
+
+	spec, err := oci.ParseImageSpec(indexName)
+	require.NoError(t, err)
+
+	resolver, err := policy.CreateImageDetailsResolver(spec)
+	require.NoError(t, err)
+	desc, err := resolver.ImageDescriptor(ctx)
+	require.NoError(t, err)
+	digest := desc.Digest.String()
+	assert.True(t, strings.Contains(digest, "sha256:"))
+}

attestation/resolver.go

@@ -0,0 +1,12 @@
+package attestation
+
+import (
+	"context"
+
+	"github.com/docker/attest/oci"
+)
+
+type Resolver interface {
+	oci.ImageDetailsResolver
+	Attestations(ctx context.Context, mediaType string) ([]*Envelope, error)
+}

attestation/sign.go

@@ -5,12 +5,12 @@ import (
 	"fmt"
 
 	"github.com/docker/attest/internal/util"
-	"github.com/docker/attest/pkg/tlog"
+	"github.com/docker/attest/tlog"
 	intoto "github.com/in-toto/in-toto-golang/in_toto"
 	"github.com/secure-systems-lab/go-securesystemslib/dsse"
 )
 
-// SignDSSE signs a payload with a given signer and uploads the signature to the transparency log
+// SignDSSE signs a payload with a given signer and uploads the signature to the transparency log.
 func SignDSSE(ctx context.Context, payload []byte, signer dsse.SignerVerifier, opts *SigningOptions) (*Envelope, error) {
 	payloadType := intoto.PayloadType
 	env := new(Envelope)
@@ -28,50 +28,44 @@ func SignDSSE(ctx context.Context, payload []byte, signer dsse.SignerVerifier, o
 	}
 
 	// get Key ID from signer
-	keyId, err := signer.KeyID()
+	keyID, err := signer.KeyID()
 	if err != nil {
 		return nil, fmt.Errorf("error getting public key ID: %w", err)
 	}
 
-	dsseSig := Signature{
-		KeyID: keyId,
+	dsseSig := &Signature{
+		KeyID: keyID,
 		Sig:   base64Encoding.EncodeToString(sig),
 	}
-	if !opts.SkipTL {
-		ext, err := logSignature(ctx, tlog.GetTL(ctx), &sig, &encPayload, signer)
+	if opts.TransparencyLog != nil {
+		ext, err := logSignature(ctx, opts.TransparencyLog, sig, encPayload, signer)
 		if err != nil {
-			return nil, fmt.Errorf("failed to log to rekor: %w", err)
+			return nil, fmt.Errorf("failed to log signature: %w", err)
 		}
-		dsseSig.Extension = *ext
+		dsseSig.Extension = ext
 	}
 	// add signature to dsse envelope
-	env.Signatures = []Signature{dsseSig}
+	env.Signatures = []*Signature{dsseSig}
 
 	return env, nil
 }
 
-// returns a new envelope with the transparency log entry added to the signature extension
-func logSignature(ctx context.Context, t tlog.TL, sig *[]byte, encPayload *[]byte, signer dsse.SignerVerifier) (*Extension, error) {
+// returns a new envelope with the transparency log entry added to the signature extension.
+func logSignature(ctx context.Context, t tlog.TransparencyLog, sig []byte, encPayload []byte, signer dsse.SignerVerifier) (*Extension, error) {
 	// get Key ID from signer
-	keyId, err := signer.KeyID()
+	keyID, err := signer.KeyID()
 	if err != nil {
 		return nil, fmt.Errorf("error getting public key ID: %w", err)
 	}
-	entry, err := t.UploadLogEntry(ctx, keyId, *encPayload, *sig, signer)
+	entry, err := t.UploadEntry(ctx, keyID, encPayload, sig, signer)
 	if err != nil {
 		return nil, fmt.Errorf("error uploading TL entry: %w", err)
 	}
-	entryObj, err := t.UnmarshalEntry(entry)
-	if err != nil {
-		return nil, fmt.Errorf("error unmarshaling tl entry: %w", err)
-	}
+
 	return &Extension{
-		Kind: DockerDsseExtKind,
-		Ext: DockerDsseExtension{
-			Tl: DockerTlExtension{
-				Kind: RekorTlExtKind,
-				Data: entryObj, // transparency log entry metadata
-			},
+		Kind: DockerDSSEExtKind,
+		Ext: &DockerDSSEExtension{
+			TL: entry,
 		},
 	}, nil
 }

attestation/sign_test.go

@@ -0,0 +1,313 @@
+package attestation_test
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"encoding/json"
+	"fmt"
+	"net/url"
+	"testing"
+	"time"
+
+	"github.com/docker/attest/attestation"
+	"github.com/docker/attest/internal/test"
+	"github.com/docker/attest/oci"
+	"github.com/docker/attest/signerverifier"
+	"github.com/docker/attest/tlog"
+	"github.com/google/go-containerregistry/pkg/registry"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/static"
+	"github.com/google/go-containerregistry/pkg/v1/types"
+	intoto "github.com/in-toto/in-toto-golang/in_toto"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSignVerifyAttestation(t *testing.T) {
+	ctx, signer := test.Setup(t)
+	stmt := &intoto.Statement{
+		StatementHeader: intoto.StatementHeader{
+			Type:          intoto.StatementInTotoV01,
+			PredicateType: intoto.PredicateSPDX,
+		},
+		Predicate: "test",
+	}
+
+	payload, err := json.Marshal(stmt)
+	require.NoError(t, err)
+	tl := tlog.GetMockTL()
+	opts := &attestation.SigningOptions{
+		TransparencyLog: tl,
+	}
+	env, err := attestation.SignDSSE(ctx, payload, signer, opts)
+	require.NoError(t, err)
+
+	// marshal envelope to json to test for bugs when marshaling envelope data
+	serializedEnv, err := json.Marshal(env)
+	require.NoError(t, err)
+	deserializedEnv := new(attestation.Envelope)
+	err = json.Unmarshal(serializedEnv, deserializedEnv)
+	require.NoError(t, err)
+
+	// signer.Public() calls AWS API when using AWS signer, use attestation.GetPublicVerificationKey() to get key from TUF repo
+	// signer.Public() used here for test purposes
+	ecPub, ok := signer.Public().(*ecdsa.PublicKey)
+	assert.True(t, ok)
+	pem, err := signerverifier.ConvertToPEM(ecPub)
+	assert.NoError(t, err)
+	keyID, err := signerverifier.KeyID(ecPub)
+	assert.NoError(t, err)
+
+	badKeyPriv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	require.NoError(t, err)
+	badKey := &badKeyPriv.PublicKey
+	badPEM, err := signerverifier.ConvertToPEM(badKey)
+	require.NoError(t, err)
+
+	testCases := []struct {
+		name          string
+		keyID         string
+		pem           []byte
+		distrust      bool
+		from          time.Time
+		to            *time.Time
+		status        string
+		expectedError string
+	}{
+		{
+			name:          "all OK",
+			keyID:         keyID,
+			pem:           pem,
+			distrust:      false,
+			from:          time.Time{},
+			to:            nil,
+			status:        "active",
+			expectedError: "",
+		},
+		{
+			name:          "key not found",
+			keyID:         "someotherkey",
+			pem:           pem,
+			distrust:      false,
+			from:          time.Time{},
+			to:            nil,
+			status:        "active",
+			expectedError: fmt.Sprintf("key not found: %s", keyID),
+		},
+		{
+			name:          "key distrusted",
+			keyID:         keyID,
+			pem:           pem,
+			distrust:      true,
+			from:          time.Time{},
+			to:            nil,
+			status:        "active",
+			expectedError: "distrusted",
+		},
+		{
+			name:          "key not yet valid",
+			keyID:         keyID,
+			pem:           pem,
+			distrust:      false,
+			from:          time.Now().Add(time.Hour),
+			to:            nil,
+			status:        "active",
+			expectedError: "not yet valid",
+		},
+		{
+			name:          "key already revoked",
+			keyID:         keyID,
+			pem:           pem,
+			distrust:      false,
+			from:          time.Time{},
+			to:            new(time.Time),
+			status:        "revoked",
+			expectedError: "already revoked",
+		},
+		{
+			name:          "bad key",
+			keyID:         keyID,
+			pem:           badPEM,
+			distrust:      false,
+			from:          time.Time{},
+			to:            nil,
+			status:        "active",
+			expectedError: "signature is not valid",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			keyMeta := &attestation.KeyMetadata{
+				ID:       tc.keyID,
+				PEM:      string(tc.pem),
+				Distrust: tc.distrust,
+				From:     tc.from,
+				To:       tc.to,
+				Status:   tc.status,
+			}
+			opts := &attestation.VerifyOptions{
+				Keys: attestation.Keys{keyMeta},
+			}
+			getTL := func(_ context.Context, opts *attestation.VerifyOptions) (tlog.TransparencyLog, error) {
+				if opts.SkipTL {
+					return nil, nil
+				}
+				return tl, nil
+			}
+			verifier, err := attestation.NewVerfier(attestation.WithLogVerifierFactory(getTL))
+			require.NoError(t, err)
+			_, err = attestation.VerifyDSSE(ctx, verifier, deserializedEnv, opts)
+			if tc.expectedError != "" {
+				require.Error(t, err)
+				assert.Contains(t, err.Error(), tc.expectedError)
+			} else {
+				assert.NoError(t, err)
+			}
+		})
+	}
+}
+
+func TestAddSignedLayerAnnotations(t *testing.T) {
+	ctx, signer := test.Setup(t)
+	testCases := []struct {
+		name    string
+		replace bool
+	}{
+		{"replaced", true},
+		{"not replaced", false},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			data := []byte("signed")
+			testLayer := static.NewLayer(data, types.MediaType(intoto.PayloadType))
+			mediaType := types.OCIManifestSchema1
+			opts := &attestation.SigningOptions{}
+			originalLayer := &attestation.Layer{
+				Layer: testLayer,
+				Statement: &intoto.Statement{
+					StatementHeader: intoto.StatementHeader{
+						PredicateType: attestation.VSAPredicateType,
+					},
+				},
+				Annotations: map[string]string{"test": "test"},
+			}
+
+			manifest := &attestation.Manifest{
+				OriginalDescriptor: &v1.Descriptor{
+					MediaType: mediaType,
+				},
+				OriginalLayers: []*attestation.Layer{
+					originalLayer,
+				},
+				SubjectDescriptor: &v1.Descriptor{},
+			}
+			err := manifest.Add(ctx, signer, originalLayer.Statement, opts)
+			require.NoError(t, err)
+
+			newImg, err := manifest.BuildImage(attestation.WithReplacedLayers(tc.replace))
+			require.NoError(t, err)
+			mf, _ := newImg.RawManifest()
+			type Annotations struct {
+				Annotations map[string]string `json:"annotations"`
+			}
+			type Layers struct {
+				Layers []Annotations `json:"layers"`
+			}
+			l := &Layers{}
+			err = json.Unmarshal(mf, l)
+			require.NoError(t, err)
+			_, ok := l.Layers[0].Annotations["test"]
+			assert.Truef(t, ok, "missing annotations")
+		})
+	}
+}
+
+func TestSimpleStatementSigning(t *testing.T) {
+	ctx, signer := test.Setup(t)
+	empty := types.MediaType("application/vnd.oci.empty.v1+json")
+	testCases := []struct {
+		name    string
+		replace bool
+	}{
+		{"replaced", true},
+		{"not replaced", false},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			opts := &attestation.SigningOptions{}
+			statement := &intoto.Statement{
+				StatementHeader: intoto.StatementHeader{
+					PredicateType: attestation.VSAPredicateType,
+				},
+			}
+			statement2 := &intoto.Statement{
+				StatementHeader: intoto.StatementHeader{
+					PredicateType: attestation.VSAPredicateType,
+				},
+			}
+			digest, err := v1.NewHash("sha256:da8b190665956ea07890a0273e2a9c96bfe291662f08e2860e868eef69c34620")
+			require.NoError(t, err)
+			subject := &v1.Descriptor{
+				MediaType: "application/vnd.oci.image.manifest.v1+json",
+				Digest:    digest,
+			}
+			manifest, err := attestation.NewManifest(subject)
+			require.NoError(t, err)
+			err = manifest.Add(ctx, signer, statement, opts)
+			require.NoError(t, err)
+
+			err = manifest.Add(ctx, signer, statement2, opts)
+			require.NoError(t, err)
+
+			// fake that the manfifest was loaded from a real image
+			manifest.OriginalLayers = manifest.SignedLayers
+			envelopes, err := attestation.ExtractEnvelopes(manifest, attestation.VSAPredicateType)
+			require.NoError(t, err)
+			assert.Len(t, envelopes, 2)
+
+			newImg, err := manifest.BuildImage(attestation.WithReplacedLayers(tc.replace))
+			require.NoError(t, err)
+			layers, err := newImg.Layers()
+			require.NoError(t, err)
+			if tc.replace {
+				assert.Len(t, layers, 2)
+			} else {
+				assert.Len(t, layers, 4)
+			}
+
+			newImgs, err := manifest.BuildReferringArtifacts()
+			require.NoError(t, err)
+			assert.Len(t, newImgs, 2)
+			for _, img := range newImgs {
+				mf, err := img.Manifest()
+				require.NoError(t, err)
+				assert.Contains(t, mf.ArtifactType, "application/vnd.in-toto")
+				assert.Contains(t, mf.ArtifactType, "+dsse")
+				assert.Equal(t, subject.MediaType, mf.MediaType)
+				assert.Equal(t, empty, mf.Config.MediaType)
+				assert.Equal(t, int64(2), mf.Config.Size)
+				assert.Equal(t, "{}", string(mf.Config.Data))
+				layers, err := img.Layers()
+				require.NoError(t, err)
+				assert.Len(t, layers, 1)
+			}
+			regServer := test.NewLocalRegistry(ctx, registry.WithReferrersSupport(true))
+			defer regServer.Close()
+
+			u, err := url.Parse(regServer.URL)
+			require.NoError(t, err)
+
+			indexName := fmt.Sprintf("%s/repo:root", u.Host)
+			output, err := oci.ParseImageSpecs(indexName)
+			require.NoError(t, err)
+			artifacts, err := manifest.BuildReferringArtifacts()
+			require.NoError(t, err)
+			err = oci.SaveImagesNoTag(ctx, artifacts, output)
+			require.NoError(t, err)
+		})
+	}
+}

attestation/types.go

@@ -0,0 +1,136 @@
+package attestation
+
+import (
+	"crypto"
+	"encoding/base64"
+	"fmt"
+	"time"
+
+	"github.com/docker/attest/tlog"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	intoto "github.com/in-toto/in-toto-golang/in_toto"
+	v02 "github.com/in-toto/in-toto-golang/in_toto/slsa_provenance/v0.2"
+	slsav1 "github.com/in-toto/in-toto-golang/in_toto/slsa_provenance/v1"
+	ociv1 "github.com/opencontainers/image-spec/specs-go/v1"
+)
+
+const (
+	DockerReferenceType           = "vnd.docker.reference.type"
+	AttestationManifestType       = "attestation-manifest"
+	InTotoPredicateType           = "in-toto.io/predicate-type"
+	DockerReferenceDigest         = "vnd.docker.reference.digest"
+	DockerDSSEExtKind             = "application/vnd.docker.attestation-verification.v1+json"
+	OCIDescriptorDSSEMediaType    = ociv1.MediaTypeDescriptor + "+dsse"
+	InTotoReferenceLifecycleStage = "vnd.docker.lifecycle-stage"
+	LifecycleStageExperimental    = "experimental"
+)
+
+var base64Encoding = base64.StdEncoding.Strict()
+
+type Layer struct {
+	Statement   *intoto.Statement
+	Layer       v1.Layer
+	Annotations map[string]string
+}
+
+type Manifest struct {
+	OriginalDescriptor *v1.Descriptor
+	OriginalLayers     []*Layer
+
+	// accumulated during signing
+	SignedLayers []*Layer
+	// details of subject image
+	SubjectName       string
+	SubjectDescriptor *v1.Descriptor
+}
+
+type ManifestImageOptions struct {
+	// how to output the image
+	skipSubject   bool
+	replaceLayers bool
+	laxReferrers  bool
+}
+
+// the following types are needed until https://github.com/secure-systems-lab/dsse/pull/61 is merged.
+type Envelope struct {
+	PayloadType string       `json:"payloadType"`
+	Payload     string       `json:"payload"`
+	Signatures  []*Signature `json:"signatures"`
+}
+type Signature struct {
+	KeyID     string     `json:"keyid"`
+	Sig       string     `json:"sig"`
+	Extension *Extension `json:"extension,omitempty"`
+}
+type Extension struct {
+	Kind string               `json:"kind"`
+	Ext  *DockerDSSEExtension `json:"ext"`
+}
+
+type AnnotatedStatement struct {
+	OCIDescriptor   *v1.Descriptor
+	InTotoStatement *intoto.Statement
+	Annotations     map[string]string
+}
+
+type DockerDSSEExtension struct {
+	TL *tlog.DockerTLExtension `json:"tl"`
+}
+
+type TransparencyLogKind string
+
+const (
+	RekorTransparencyLogKind = "rekor"
+)
+
+type VerifyOptions struct {
+	Keys            []*KeyMetadata      `json:"keys"`
+	SkipTL          bool                `json:"skip_tl"`
+	TransparencyLog TransparencyLogKind `json:"tl"`
+}
+
+type KeyMetadata struct {
+	ID            string     `json:"id"`
+	PEM           string     `json:"key"`
+	From          time.Time  `json:"from"`
+	To            *time.Time `json:"to"`
+	Status        string     `json:"status"`
+	SigningFormat string     `json:"signing-format"`
+	Distrust      bool       `json:"distrust,omitempty"`
+	publicKey     crypto.PublicKey
+}
+
+type (
+	Keys    []*KeyMetadata
+	KeysMap map[string]*KeyMetadata
+)
+
+type SigningOptions struct {
+	// set this in order to log to a transparency log
+	TransparencyLog tlog.TransparencyLog
+}
+
+type Options struct {
+	NoReferrers   bool
+	Attach        bool
+	ReferrersRepo string
+}
+
+func DSSEMediaType(predicateType string) (string, error) {
+	var predicateName string
+	switch predicateType {
+	case slsav1.PredicateSLSAProvenance:
+		predicateName = "provenance"
+	case v02.PredicateSLSAProvenance:
+		predicateName = "provenance"
+	case intoto.PredicateSPDX:
+		predicateName = "spdx"
+	case VSAPredicateType:
+		predicateName = "verification_summary"
+
+	default:
+		return "", fmt.Errorf("unknown predicate type %q", predicateType)
+	}
+
+	return fmt.Sprintf("application/vnd.in-toto.%s+dsse", predicateName), nil
+}

attestation/types_test.go

@@ -0,0 +1,44 @@
+package attestation
+
+import (
+	"fmt"
+	"testing"
+
+	intoto "github.com/in-toto/in-toto-golang/in_toto"
+	v02 "github.com/in-toto/in-toto-golang/in_toto/slsa_provenance/v0.2"
+	slsav1 "github.com/in-toto/in-toto-golang/in_toto/slsa_provenance/v1"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDSSEMediaType(t *testing.T) {
+	testcases := []struct {
+		name     string
+		expected string
+	}{
+		{
+			name:     slsav1.PredicateSLSAProvenance,
+			expected: "provenance",
+		},
+		{
+			name:     v02.PredicateSLSAProvenance,
+			expected: "provenance",
+		},
+		{
+			name:     intoto.PredicateSPDX,
+			expected: "spdx",
+		},
+		{
+			name:     VSAPredicateType,
+			expected: "verification_summary",
+		},
+	}
+
+	for _, tc := range testcases {
+		t.Run(tc.name, func(t *testing.T) {
+			mt, err := DSSEMediaType(tc.name)
+			require.NoError(t, err)
+			assert.Equal(t, fmt.Sprintf("application/vnd.in-toto.%s+dsse", tc.expected), mt)
+		})
+	}
+}

attestation/verifier.go

@@ -0,0 +1,143 @@
+package attestation
+
+import (
+	"context"
+	"crypto"
+	"crypto/x509"
+	"fmt"
+
+	"github.com/docker/attest/signerverifier"
+	"github.com/docker/attest/tlog"
+	"github.com/docker/attest/tuf"
+	"github.com/secure-systems-lab/go-securesystemslib/dsse"
+)
+
+func WithTUFDownloader(tufDownloader tuf.Downloader) func(*verifier) {
+	return func(r *verifier) {
+		r.tufDownloader = tufDownloader
+	}
+}
+
+type SignatureVerifierFactory func(ctx context.Context, publicKey crypto.PublicKey, opts *VerifyOptions) (dsse.Verifier, error)
+
+func WithSignatureVerifierFactory(factory SignatureVerifierFactory) func(*verifier) {
+	return func(r *verifier) {
+		r.signatureVerifierFactory = factory
+	}
+}
+
+func WithLogVerifierFactory(factory LogVerifierFactory) func(*verifier) {
+	return func(r *verifier) {
+		r.logVerifierFactory = factory
+	}
+}
+
+type LogVerifierFactory func(ctx context.Context, opts *VerifyOptions) (tlog.TransparencyLog, error)
+
+func NewVerfier(options ...func(*verifier)) (Verifier, error) {
+	verifier := &verifier{}
+	for _, opt := range options {
+		opt(verifier)
+	}
+	return verifier, nil
+}
+
+type Verifier interface {
+	GetSignatureVerifier(ctx context.Context, publicKey crypto.PublicKey, opts *VerifyOptions) (dsse.Verifier, error)
+	GetLogVerifier(ctx context.Context, opts *VerifyOptions) (tlog.TransparencyLog, error)
+	VerifySignature(ctx context.Context, publicKey crypto.PublicKey, data []byte, signature []byte, opts *VerifyOptions) error
+	VerifyLog(ctx context.Context, keyMeta *KeyMetadata, data []byte, sig *Signature, opts *VerifyOptions) error
+}
+
+// ensure it has all the necessary methods.
+var _ Verifier = (*verifier)(nil)
+
+type verifier struct {
+	tufDownloader            tuf.Downloader
+	signatureVerifierFactory SignatureVerifierFactory
+	logVerifierFactory       LogVerifierFactory
+}
+
+// GetLogVerifier implements Verifier.
+func (v *verifier) GetLogVerifier(ctx context.Context, opts *VerifyOptions) (tlog.TransparencyLog, error) {
+	if v.logVerifierFactory != nil {
+		return v.logVerifierFactory(ctx, opts)
+	}
+	if opts.SkipTL {
+		return nil, nil
+	}
+	// TODO support other transparency logs
+	var transparencyLog tlog.TransparencyLog
+	switch opts.TransparencyLog {
+	case "", RekorTransparencyLogKind:
+		var err error
+		transparencyLog, err = tlog.NewRekorLog(tlog.WithTUFDownloader(v.tufDownloader))
+		if err != nil {
+			return nil, fmt.Errorf("error failed to create rekor verifier: %w", err)
+		}
+	default:
+		return nil, fmt.Errorf("unsupported transparency log: %s", opts.TransparencyLog)
+	}
+	return transparencyLog, nil
+}
+
+// GetSignatureVerifier implements Verifier.
+func (v *verifier) GetSignatureVerifier(ctx context.Context, publicKey crypto.PublicKey, opts *VerifyOptions) (dsse.Verifier, error) {
+	if v.signatureVerifierFactory != nil {
+		return v.signatureVerifierFactory(ctx, publicKey, opts)
+	}
+	// TODO: use details from opts to decide which algorithm to use here
+	ecdsaVerifier, err := signerverifier.NewECDSAVerifier(publicKey)
+	if err != nil {
+		return nil, fmt.Errorf("error failed to create ecdsa verifier: %w", err)
+	}
+	return ecdsaVerifier, nil
+}
+
+func (v *verifier) VerifySignature(ctx context.Context, publicKey crypto.PublicKey, data []byte, signature []byte, opts *VerifyOptions) error {
+	sigVerifier, err := v.GetSignatureVerifier(ctx, publicKey, opts)
+	if err != nil {
+		return fmt.Errorf("error failed to get verifier: %w", err)
+	}
+	return sigVerifier.Verify(ctx, data, signature)
+}
+
+func (v *verifier) VerifyLog(ctx context.Context, keyMeta *KeyMetadata, encPayload []byte, sig *Signature, opts *VerifyOptions) error {
+	if opts.SkipTL {
+		return nil
+	}
+	if sig.Extension == nil || sig.Extension.Kind == "" {
+		return fmt.Errorf("error missing signature extension")
+	}
+	if sig.Extension.Kind != DockerDSSEExtKind {
+		return fmt.Errorf("error unsupported signature extension kind: %s", sig.Extension.Kind)
+	}
+	transparencyLog, err := v.GetLogVerifier(ctx, opts)
+	if err != nil {
+		return fmt.Errorf("error failed to get transparency log verifier: %w", err)
+	}
+	if transparencyLog == nil {
+		return fmt.Errorf("error missing transparency log verifier")
+	}
+
+	// verify TL entry payload
+	publicKey, err := keyMeta.ParsedKey()
+	if err != nil {
+		return fmt.Errorf("error failed to parse public key: %w", err)
+	}
+	encodedPub, err := x509.MarshalPKIXPublicKey(publicKey)
+	if err != nil {
+		return fmt.Errorf("error failed to marshal public key: %w", err)
+	}
+	integratedTime, err := transparencyLog.VerifyEntry(ctx, sig.Extension.Ext.TL, encPayload, encodedPub)
+	if err != nil {
+		return fmt.Errorf("TL entry failed verification: %w", err)
+	}
+	if integratedTime.Before(keyMeta.From) {
+		return fmt.Errorf("key %s was not yet valid at TL log time %s (key valid from %s)", keyMeta.ID, integratedTime, keyMeta.From)
+	}
+	if keyMeta.To != nil && !integratedTime.Before(*keyMeta.To) {
+		return fmt.Errorf("key %s was already %s at TL log time %s (key %s at %s)", keyMeta.ID, keyMeta.Status, integratedTime, keyMeta.Status, *keyMeta.To)
+	}
+	return nil
+}

attestation/verifier_test.go

@@ -0,0 +1,55 @@
+package attestation
+
+import (
+	"context"
+	"reflect"
+	"testing"
+
+	"github.com/docker/attest/tlog"
+	"github.com/docker/attest/tuf"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_verifier_GetLogVerifier(t *testing.T) {
+	type fields struct {
+		tufDownloader            tuf.Downloader
+		signatureVerifierFactory SignatureVerifierFactory
+		logVerifierFactory       LogVerifierFactory
+	}
+	type args struct {
+		ctx  context.Context
+		opts *VerifyOptions
+	}
+	rekor, err := tlog.NewRekorLog()
+	require.NoError(t, err)
+	tests := []struct {
+		name    string
+		fields  fields
+		args    args
+		want    tlog.TransparencyLog
+		wantErr bool
+	}{
+		{name: "skip_tl true", fields: fields{}, args: args{ctx: context.Background(), opts: &VerifyOptions{SkipTL: true}}},
+		{name: "skip_tl false", fields: fields{}, args: args{ctx: context.Background(), opts: &VerifyOptions{SkipTL: false}}, want: rekor},
+		{name: "tl: rekor", fields: fields{logVerifierFactory: func(_ context.Context, _ *VerifyOptions) (tlog.TransparencyLog, error) {
+			return &tlog.Rekor{}, nil
+		}}, args: args{ctx: context.Background(), opts: &VerifyOptions{}}, want: &tlog.Rekor{}},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			v := &verifier{
+				tufDownloader:            tt.fields.tufDownloader,
+				signatureVerifierFactory: tt.fields.signatureVerifierFactory,
+				logVerifierFactory:       tt.fields.logVerifierFactory,
+			}
+			got, err := v.GetLogVerifier(tt.args.ctx, tt.args.opts)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("verifier.GetLogVerifier() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("verifier.GetLogVerifier() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

attestation/verify.go

@@ -0,0 +1,83 @@
+package attestation
+
+import (
+	"context"
+	"crypto"
+	"encoding/base64"
+	"fmt"
+
+	"github.com/docker/attest/signerverifier"
+	intoto "github.com/in-toto/in-toto-golang/in_toto"
+	ociv1 "github.com/opencontainers/image-spec/specs-go/v1"
+	"github.com/secure-systems-lab/go-securesystemslib/dsse"
+)
+
+func VerifyDSSE(ctx context.Context, verifier Verifier, env *Envelope, opts *VerifyOptions) ([]byte, error) {
+	// enforce payload type
+	if !ValidPayloadType(env.PayloadType) {
+		return nil, fmt.Errorf("unsupported payload type %s", env.PayloadType)
+	}
+
+	if len(env.Signatures) == 0 {
+		return nil, fmt.Errorf("no signatures found")
+	}
+
+	keys := make(map[string]*KeyMetadata, len(opts.Keys))
+	for _, key := range opts.Keys {
+		keys[key.ID] = key
+	}
+
+	payload, err := base64Encoding.DecodeString(env.Payload)
+	if err != nil {
+		return nil, fmt.Errorf("error failed to decode payload: %w", err)
+	}
+
+	encPayload := dsse.PAE(env.PayloadType, payload)
+	// verify signatures and transparency log entry
+	for _, sig := range env.Signatures {
+		// resolve public key used to sign
+		keyMeta, ok := keys[sig.KeyID]
+		if !ok {
+			return nil, fmt.Errorf("error key not found: %s", sig.KeyID)
+		}
+
+		if keyMeta.Distrust {
+			return nil, fmt.Errorf("key %s is distrusted", keyMeta.ID)
+		}
+		publicKey, err := keyMeta.ParsedKey()
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse public key: %w", err)
+		}
+		// decode signature
+		signature, err := base64.StdEncoding.Strict().DecodeString(sig.Sig)
+		if err != nil {
+			return nil, fmt.Errorf("error failed to decode signature: %w", err)
+		}
+
+		err = verifier.VerifySignature(ctx, publicKey, encPayload, signature, opts)
+		if err != nil {
+			return nil, fmt.Errorf("error failed to verify signature: %w", err)
+		}
+		if err := verifier.VerifyLog(ctx, keyMeta, encPayload, sig, opts); err != nil {
+			return nil, fmt.Errorf("error failed to verify transparency log entry: %w", err)
+		}
+	}
+
+	return payload, nil
+}
+
+func ValidPayloadType(payloadType string) bool {
+	return payloadType == intoto.PayloadType || payloadType == ociv1.MediaTypeDescriptor
+}
+
+func (km *KeyMetadata) ParsedKey() (crypto.PublicKey, error) {
+	if km.publicKey != nil {
+		return km.publicKey, nil
+	}
+	publicKey, err := signerverifier.ParsePublicKey([]byte(km.PEM))
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse public key: %w", err)
+	}
+	km.publicKey = publicKey
+	return publicKey, nil
+}

attestation/verify_test.go

@@ -4,8 +4,8 @@ import (
 	"encoding/base64"
 	"testing"
 
+	"github.com/docker/attest/attestation"
 	"github.com/docker/attest/internal/test"
-	"github.com/docker/attest/pkg/attestation"
 	intoto "github.com/in-toto/in-toto-golang/in_toto"
 	ociv1 "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/stretchr/testify/assert"
@@ -35,15 +35,14 @@ func TestVerifyUnsignedAttestation(t *testing.T) {
 	payload := []byte("payload")
 	env := &attestation.Envelope{
 		// no signatures
-		Signatures:  []attestation.Signature{},
+		Signatures:  []*attestation.Signature{},
 		Payload:     base64.StdEncoding.EncodeToString(payload),
 		PayloadType: intoto.PayloadType,
 	}
 	opts := &attestation.VerifyOptions{
 		Keys: attestation.Keys{},
 	}
-
-	_, err := attestation.VerifyDSSE(ctx, env, opts)
+	_, err := attestation.VerifyDSSE(ctx, nil, env, opts)
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "no signatures")
 }

attestation/vsa.go

@@ -14,9 +14,9 @@ const (
 type VSAPredicate struct {
 	Verifier           VSAVerifier           `json:"verifier"`
 	TimeVerified       string                `json:"timeVerified"`
-	ResourceUri        string                `json:"resourceUri"`
+	ResourceURI        string                `json:"resourceUri"`
 	Policy             VSAPolicy             `json:"policy"`
-	InputAttestations  []VSAInputAttestation `json:"inputAttestations"`
+	InputAttestations  []VSAInputAttestation `json:"inputAttestations,omitempty"`
 	VerificationResult string                `json:"verificationResult"`
 	VerifiedLevels     []string              `json:"verifiedLevels"`
 }
@@ -26,7 +26,9 @@ type VSAVerifier struct {
 }
 
 type VSAPolicy struct {
-	URI string `json:"uri"`
+	URI              string            `json:"uri,omitempty"`
+	Digest           map[string]string `json:"digest"`
+	DownloadLocation string            `json:"downloadLocation,omitempty"`
 }
 
 type VSAInputAttestation struct {
@@ -35,7 +37,7 @@ type VSAInputAttestation struct {
 }
 
 func ToVSAResourceURI(sub intoto.Subject) (string, error) {
-	//parse purl
+	// parse purl
 	purl, err := packageurl.FromString(sub.Name)
 	if err != nil {
 		return "", fmt.Errorf("failed to parse package url: %w", err)

codecov.yml

@@ -0,0 +1,5 @@
+ignore:
+  - "internal/test"
+coverage:
+  status:
+    patch: false

example_sign_test.go

@@ -3,17 +3,17 @@ package attest_test
 import (
 	"context"
 
-	"github.com/docker/attest/pkg/attest"
-	"github.com/docker/attest/pkg/attestation"
-	"github.com/docker/attest/pkg/mirror"
-	"github.com/docker/attest/pkg/oci"
-	"github.com/docker/attest/pkg/signerverifier"
+	"github.com/docker/attest"
+	"github.com/docker/attest/attestation"
+	"github.com/docker/attest/oci"
+	"github.com/docker/attest/signerverifier"
+	"github.com/docker/attest/tlog"
 	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/empty"
 	"github.com/google/go-containerregistry/pkg/v1/mutate"
 )
 
-func ExampleSign_remote() {
+func ExampleSignStatements_remote() {
 	// configure signerverifier
 	// local signer (unsafe for production)
 	signer, err := signerverifier.GenKeyPair()
@@ -26,28 +26,42 @@ func ExampleSign_remote() {
 	// signer, err := signerverifier.GetAWSSigner(cmd.Context(), aws_arn, aws_region)
 
 	// configure signing options
+
+	// use rekor transparency log wit static rekor public key (see options to use dynamic rekor public key)
+	rekor, err := tlog.NewRekorLog()
+	if err != nil {
+		panic(err)
+	}
 	opts := &attestation.SigningOptions{
-		Replace: true, // replace unsigned intoto statements with signed intoto attestations, otherwise leave in place
+		TransparencyLog: rekor, // unset this to disable signature transparency logging
 	}
 
 	// load image index with unsigned attestation-manifests
 	ref := "docker/image-signer-verifier:latest"
-	att, err := oci.SubjectIndexFromRemote(ref)
+	attIdx, err := oci.IndexFromRemote(context.Background(), ref)
 	if err != nil {
 		panic(err)
 	}
 	// example for local image index
 	// path := "/myimage"
-	// att, err := oci.AttestationIndexFromLocal(path)
+	// attIdx, err = oci.IndexFromPath(path)
+	// if err != nil {
+	// 	panic(err)
+	// }
 
-	// sign attestations
-	signedImageIndex, err := attest.Sign(context.Background(), att.Index, signer, opts)
+	// sign all attestations in an image index
+	signedManifests, err := attest.SignStatements(context.Background(), attIdx.Index, signer, opts)
+	if err != nil {
+		panic(err)
+	}
+	signedIndex := attIdx.Index
+	signedIndex, err = attestation.UpdateIndexImages(signedIndex, signedManifests)
 	if err != nil {
 		panic(err)
 	}
 
 	// push image index with signed attestation-manifests
-	err = mirror.PushIndexToRegistry(signedImageIndex, ref)
+	err = oci.PushIndexToRegistry(context.Background(), signedIndex, ref)
 	if err != nil {
 		panic(err)
 	}
@@ -55,14 +69,14 @@ func ExampleSign_remote() {
 	path := "/myimage"
 	idx := v1.ImageIndex(empty.Index)
 	idx = mutate.AppendManifests(idx, mutate.IndexAddendum{
-		Add: signedImageIndex,
+		Add: signedIndex,
 		Descriptor: v1.Descriptor{
 			Annotations: map[string]string{
-				oci.OciReferenceTarget: att.Name,
+				oci.OCIReferenceTarget: attIdx.Name,
 			},
 		},
 	})
-	err = mirror.SaveIndexAsOCILayout(idx, path)
+	err = oci.SaveIndexAsOCILayout(idx, path)
 	if err != nil {
 		panic(err)
 	}

example_verify_test.go

@@ -0,0 +1,54 @@
+package attest_test
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/docker/attest"
+	"github.com/docker/attest/oci"
+	"github.com/docker/attest/policy"
+	"github.com/docker/attest/tuf"
+)
+
+func ExampleVerify_remote() {
+	// create a tuf client
+	home, err := os.UserHomeDir()
+	if err != nil {
+		panic(err)
+	}
+	tufOutputPath := filepath.Join(home, ".docker", "tuf")
+	tufClientOpts := tuf.NewDockerDefaultClientOptions(tufOutputPath)
+
+	// create a resolver for remote attestations
+	image := "registry-1.docker.io/library/notary:server"
+	platform := "linux/amd64"
+
+	// configure policy options
+	opts := &policy.Options{
+		TUFClientOptions: tufClientOpts,
+		LocalTargetsDir:  filepath.Join(home, ".docker", "policy"), // location to store policy files downloaded from TUF
+		LocalPolicyDir:   "",                                       // overrides TUF policy for local policy files if set
+		PolicyID:         "",                                       // set to ignore policy mapping and select a policy by id
+		DisableTUF:       false,                                    // set to disable TUF and rely on local policy files
+	}
+
+	src, err := oci.ParseImageSpec(image, oci.WithPlatform(platform))
+	if err != nil {
+		panic(err)
+	}
+	// verify attestations
+	result, err := attest.Verify(context.Background(), src, opts)
+	if err != nil {
+		panic(err)
+	}
+	switch result.Outcome {
+	case attest.OutcomeSuccess:
+		fmt.Println("policy passed")
+	case attest.OutcomeNoPolicy:
+		fmt.Println("no policy for image")
+	case attest.OutcomeFailure:
+		fmt.Println("policy failed")
+	}
+}

go.mod

@@ -1,88 +1,83 @@
 module github.com/docker/attest
 
-go 1.22.1
+go 1.22.5
 
 require (
-	github.com/Masterminds/semver/v3 v3.2.1
-	github.com/aws/aws-sdk-go-v2/config v1.27.21
+	github.com/Masterminds/semver/v3 v3.3.0
+	github.com/aws/aws-sdk-go-v2/config v1.27.35
 	github.com/awslabs/amazon-ecr-credential-helper/ecr-login v0.0.0-20231024185945-8841054dbdb8
-	github.com/containerd/containerd v1.7.18
+	github.com/containerd/platforms v0.2.1
 	github.com/distribution/reference v0.6.0
 	github.com/go-openapi/runtime v0.28.0
 	github.com/go-openapi/strfmt v0.23.0
-	github.com/google/go-containerregistry v0.19.2
-	github.com/hashicorp/go-cleanhttp v0.5.2
+	github.com/google/go-containerregistry v0.20.2
 	github.com/in-toto/in-toto-golang v0.9.0
-	github.com/open-policy-agent/opa v0.65.0
+	github.com/open-policy-agent/opa v0.68.0
 	github.com/opencontainers/image-spec v1.1.0
 	github.com/package-url/packageurl-go v0.1.3
-	github.com/pkg/errors v0.9.1
 	github.com/secure-systems-lab/go-securesystemslib v0.8.0
-	github.com/sigstore/cosign/v2 v2.2.4
+	github.com/sigstore/cosign/v2 v2.4.0
 	github.com/sigstore/rekor v1.3.6
-	github.com/sigstore/sigstore/pkg/signature/kms/aws v1.8.5
+	github.com/sigstore/sigstore v1.8.9
+	github.com/sigstore/sigstore/pkg/signature/kms/aws v1.8.9
+	github.com/sigstore/sigstore/pkg/signature/kms/gcp v1.8.9
 	github.com/stretchr/testify v1.9.0
-	github.com/testcontainers/testcontainers-go v0.31.0
-	github.com/testcontainers/testcontainers-go/modules/registry v0.31.0
-	github.com/theupdateframework/go-tuf/v2 v2.0.0-20240504210453-5a634eb214ae // for https://github.com/theupdateframework/go-tuf/pull/632
-	gopkg.in/yaml.v3 v3.0.1
+	github.com/theupdateframework/go-tuf/v2 v2.0.0
+	google.golang.org/api v0.197.0
 	sigs.k8s.io/yaml v1.4.0
 )
 
+// fork with changes to support ArtifactType (https://github.com/google/go-containerregistry/pull/1931)
+replace github.com/google/go-containerregistry => github.com/docker/go-containerregistry v0.0.0-20240808132857-c8bfc44af7c8
+
 require (
-	cloud.google.com/go/compute v1.25.1 // indirect
-	cloud.google.com/go/compute/metadata v0.2.3 // indirect
-	dario.cat/mergo v1.0.0 // indirect
-	github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161 // indirect
-	github.com/Microsoft/go-winio v0.6.2 // indirect
-	github.com/Microsoft/hcsshim v0.12.3 // indirect
+	cloud.google.com/go v0.115.1 // indirect
+	cloud.google.com/go/auth v0.9.3 // indirect
+	cloud.google.com/go/auth/oauth2adapt v0.2.4 // indirect
+	cloud.google.com/go/compute/metadata v0.5.0 // indirect
+	cloud.google.com/go/iam v1.2.0 // indirect
+	cloud.google.com/go/kms v1.19.0 // indirect
+	cloud.google.com/go/longrunning v0.6.0 // indirect
 	github.com/OneOfOne/xxhash v1.2.8 // indirect
 	github.com/ProtonMail/go-crypto v1.0.0 // indirect
 	github.com/agnivade/levenshtein v1.1.1 // indirect
 	github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect
-	github.com/aws/aws-sdk-go-v2 v1.30.0 // indirect
-	github.com/aws/aws-sdk-go-v2/credentials v1.17.21 // indirect
-	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.8 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.12 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.12 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0 // indirect
+	github.com/aws/aws-sdk-go-v2 v1.30.5 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.17.33 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.13 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.17 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.17 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.1 // indirect
 	github.com/aws/aws-sdk-go-v2/service/ecr v1.29.1 // indirect
 	github.com/aws/aws-sdk-go-v2/service/ecrpublic v1.24.1 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.2 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.14 // indirect
-	github.com/aws/aws-sdk-go-v2/service/kms v1.34.1 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sso v1.21.1 // indirect
-	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.25.1 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sts v1.29.1 // indirect
-	github.com/aws/smithy-go v1.20.2 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.4 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.19 // indirect
+	github.com/aws/aws-sdk-go-v2/service/kms v1.35.5 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.22.8 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.26.8 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.30.8 // indirect
+	github.com/aws/smithy-go v1.20.4 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/blang/semver v3.5.1+incompatible // indirect
-	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/cloudflare/circl v1.3.8 // indirect
-	github.com/containerd/errdefs v0.1.0 // indirect
 	github.com/containerd/log v0.1.0 // indirect
 	github.com/containerd/stargz-snapshotter/estargz v0.15.1 // indirect
-	github.com/cpuguy83/dockercfg v0.3.1 // indirect
 	github.com/cyberphone/json-canonicalization v0.0.0-20231217050601-ba74d44ecf5f // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/digitorus/pkcs7 v0.0.0-20230818184609-3a137a874352 // indirect
 	github.com/digitorus/timestamp v0.0.0-20231217203849-220c5c2851b7 // indirect
-	github.com/docker/cli v26.1.3+incompatible // indirect
+	github.com/docker/cli v27.1.1+incompatible // indirect
 	github.com/docker/distribution v2.8.3+incompatible // indirect
-	github.com/docker/docker v26.1.3+incompatible // indirect
 	github.com/docker/docker-credential-helpers v0.8.1 // indirect
-	github.com/docker/go-connections v0.5.0 // indirect
-	github.com/docker/go-units v0.5.0 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
 	github.com/go-chi/chi v4.1.2+incompatible // indirect
 	github.com/go-ini/ini v1.67.0 // indirect
-	github.com/go-jose/go-jose/v4 v4.0.1 // indirect
+	github.com/go-jose/go-jose/v4 v4.0.2 // indirect
 	github.com/go-logr/logr v1.4.2 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
-	github.com/go-ole/go-ole v1.3.0 // indirect
 	github.com/go-openapi/analysis v0.23.0 // indirect
 	github.com/go-openapi/errors v0.22.0 // indirect
 	github.com/go-openapi/jsonpointer v0.21.0 // indirect
@@ -92,91 +87,92 @@ require (
 	github.com/go-openapi/swag v0.23.0 // indirect
 	github.com/go-openapi/validate v0.24.0 // indirect
 	github.com/gobwas/glob v0.2.3 // indirect
-	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/snappy v0.0.4 // indirect
-	github.com/google/certificate-transparency-go v1.1.8 // indirect
+	github.com/google/certificate-transparency-go v1.2.1 // indirect
+	github.com/google/s2a-go v0.1.8 // indirect
 	github.com/google/uuid v1.6.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.4 // indirect
+	github.com/googleapis/gax-go/v2 v2.13.0 // indirect
 	github.com/gorilla/mux v1.8.1 // indirect
-	github.com/hashicorp/go-retryablehttp v0.7.6 // indirect
+	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+	github.com/hashicorp/go-retryablehttp v0.7.7 // indirect
 	github.com/hashicorp/hcl v1.0.1-vault-5 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jedisct1/go-minisign v0.0.0-20230811132847-661be99b8267 // indirect
-	github.com/jellydator/ttlcache/v3 v3.2.0 // indirect
+	github.com/jellydator/ttlcache/v3 v3.3.0 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
-	github.com/klauspost/compress v1.17.8 // indirect
-	github.com/letsencrypt/boulder v0.0.0-20240613153800-a69ba997609e // indirect
-	github.com/lufia/plan9stats v0.0.0-20240513124658-fba389f38bae // indirect
+	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/letsencrypt/boulder v0.0.0-20240620165639-de9c06129bec // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
-	github.com/moby/docker-image-spec v1.3.1 // indirect
-	github.com/moby/patternmatcher v0.6.0 // indirect
-	github.com/moby/sys/sequential v0.5.0 // indirect
-	github.com/moby/sys/user v0.1.0 // indirect
-	github.com/moby/term v0.5.0 // indirect
-	github.com/morikuni/aec v1.0.0 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/nozzle/throttler v0.0.0-20180817012639-2ea982251481 // indirect
 	github.com/oklog/ulid v1.3.1 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opentracing/opentracing-go v1.2.0 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
-	github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 // indirect
-	github.com/prometheus/client_golang v1.19.1 // indirect
+	github.com/prometheus/client_golang v1.20.2 // indirect
 	github.com/prometheus/client_model v0.6.1 // indirect
-	github.com/prometheus/common v0.53.0 // indirect
-	github.com/prometheus/procfs v0.15.0 // indirect
+	github.com/prometheus/common v0.55.0 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
 	github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475 // indirect
 	github.com/sagikazarmark/locafero v0.4.0 // indirect
 	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
 	github.com/sassoftware/relic v7.2.1+incompatible // indirect
 	github.com/shibumi/go-pathspec v1.3.0 // indirect
-	github.com/shirou/gopsutil/v3 v3.24.4 // indirect
-	github.com/shoenig/go-m1cpu v0.1.6 // indirect
-	github.com/sigstore/sigstore v1.8.3 // indirect
+	github.com/sigstore/protobuf-specs v0.3.2 // indirect
 	github.com/sigstore/timestamp-authority v1.2.2 // indirect
 	github.com/sirupsen/logrus v1.9.3 // indirect
 	github.com/sourcegraph/conc v0.3.0 // indirect
 	github.com/spf13/afero v1.11.0 // indirect
 	github.com/spf13/cast v1.6.0 // indirect
-	github.com/spf13/cobra v1.8.0 // indirect
+	github.com/spf13/cobra v1.8.1 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
-	github.com/spf13/viper v1.18.2 // indirect
+	github.com/spf13/viper v1.19.0 // indirect
 	github.com/subosito/gotenv v1.6.0 // indirect
 	github.com/syndtr/goleveldb v1.0.1-0.20220721030215-126854af5e6d // indirect
 	github.com/tchap/go-patricia/v2 v2.3.1 // indirect
 	github.com/theupdateframework/go-tuf v0.7.0 // indirect
 	github.com/titanous/rocacheck v0.0.0-20171023193734-afe73141d399 // indirect
-	github.com/tklauser/go-sysconf v0.3.14 // indirect
-	github.com/tklauser/numcpus v0.8.0 // indirect
 	github.com/transparency-dev/merkle v0.0.2 // indirect
 	github.com/vbatts/tar-split v0.11.5 // indirect
 	github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
 	github.com/yashtewari/glob-intersection v0.2.0 // indirect
-	github.com/yusufpapurcu/wmi v1.2.4 // indirect
 	go.mongodb.org/mongo-driver v1.15.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.52.0 // indirect
-	go.opentelemetry.io/otel v1.27.0 // indirect
-	go.opentelemetry.io/otel/metric v1.27.0 // indirect
-	go.opentelemetry.io/otel/sdk v1.27.0 // indirect
-	go.opentelemetry.io/otel/trace v1.27.0 // indirect
+	go.opencensus.io v0.24.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.54.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.54.0 // indirect
+	go.opentelemetry.io/otel v1.29.0 // indirect
+	go.opentelemetry.io/otel/metric v1.29.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.28.0 // indirect
+	go.opentelemetry.io/otel/trace v1.29.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/zap v1.27.0 // indirect
-	golang.org/x/crypto v0.24.0 // indirect
+	golang.org/x/crypto v0.27.0 // indirect
 	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
-	golang.org/x/mod v0.17.0 // indirect
-	golang.org/x/oauth2 v0.19.0 // indirect
-	golang.org/x/sync v0.7.0 // indirect
-	golang.org/x/sys v0.21.0 // indirect
-	golang.org/x/term v0.21.0 // indirect
-	golang.org/x/text v0.16.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240520151616-dc85e6b867a5 // indirect
-	google.golang.org/grpc v1.64.0 // indirect
-	google.golang.org/protobuf v1.34.1 // indirect
+	golang.org/x/mod v0.19.0 // indirect
+	golang.org/x/net v0.29.0 // indirect
+	golang.org/x/oauth2 v0.23.0 // indirect
+	golang.org/x/sync v0.8.0 // indirect
+	golang.org/x/sys v0.25.0 // indirect
+	golang.org/x/term v0.24.0 // indirect
+	golang.org/x/text v0.18.0 // indirect
+	golang.org/x/time v0.6.0 // indirect
+	google.golang.org/genproto v0.0.0-20240903143218-8af14fe29dc1 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20240827150818-7e3bb234dfed // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1 // indirect
+	google.golang.org/grpc v1.66.1 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	gotest.tools/v3 v3.5.1 // indirect
 	k8s.io/klog/v2 v2.120.1 // indirect
 )

go.sum

@@ -1,40 +1,40 @@
-cloud.google.com/go v0.112.1 h1:uJSeirPke5UNZHIb4SxfZklVSiWWVqW4oXlETwZziwM=
-cloud.google.com/go/compute v1.25.1 h1:ZRpHJedLtTpKgr3RV1Fx23NuaAEN1Zfx9hw1u4aJdjU=
-cloud.google.com/go/compute v1.25.1/go.mod h1:oopOIR53ly6viBYxaDhBfJwzUAxf1zE//uf3IB011ls=
-cloud.google.com/go/compute/metadata v0.2.3 h1:mg4jlk7mCAj6xXp9UJ4fjI9VUI5rubuGBW5aJ7UnBMY=
-cloud.google.com/go/compute/metadata v0.2.3/go.mod h1:VAV5nSsACxMJvgaAuX6Pk2AawlZn8kiOGuCv6gTkwuA=
-cloud.google.com/go/iam v1.1.6 h1:bEa06k05IO4f4uJonbB5iAgKTPpABy1ayxaIZV/GHVc=
-cloud.google.com/go/iam v1.1.6/go.mod h1:O0zxdPeGBoFdWW3HWmBxJsk0pfvNM/p/qa82rWOGTwI=
-cloud.google.com/go/kms v1.15.8 h1:szIeDCowID8th2i8XE4uRev5PMxQFqW+JjwYxL9h6xs=
-cloud.google.com/go/kms v1.15.8/go.mod h1:WoUHcDjD9pluCg7pNds131awnH429QGvRM3N/4MyoVs=
-cuelabs.dev/go/oci/ociregistry v0.0.0-20240314152124-224736b49f2e h1:GwCVItFUPxwdsEYnlUcJ6PJxOjTeFFCKOh6QWg4oAzQ=
-cuelabs.dev/go/oci/ociregistry v0.0.0-20240314152124-224736b49f2e/go.mod h1:ApHceQLLwcOkCEXM1+DyCXTHEJhNGDpJ2kmV6axsx24=
-cuelang.org/go v0.8.1 h1:VFYsxIFSPY5KgSaH1jQ2GxHOrbu6Ga3kEI70yCZwnOg=
-cuelang.org/go v0.8.1/go.mod h1:CoDbYolfMms4BhWUlhD+t5ORnihR7wvjcfgyO9lL5FI=
-dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
-dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
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+cloud.google.com/go/compute/metadata v0.5.0/go.mod h1:aHnloV2TPI38yx4s9+wAZhHykWvVCfu7hQbF+9CWoiY=
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+cuelang.org/go v0.9.2/go.mod h1:qpAYsLOf7gTM1YdEg6cxh553uZ4q9ZDWlPbtZr9q1Wk=
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-github.com/AdaLogics/go-fuzz-headers v0.0.0-20230811130428-ced1acdcaa24 h1:bvDV9vkmnHYOMsOr4WLk+Vo07yKIzd94sVoIqshQ4bU=
-github.com/AdaLogics/go-fuzz-headers v0.0.0-20230811130428-ced1acdcaa24/go.mod h1:8o94RPi1/7XTJvwPpRSzSUedZrtlirdB3r9Z20bi2f8=
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 github.com/AliyunContainerService/ack-ram-tool/pkg/credentials/alibabacloudsdkgo/helper v0.2.0 h1:8+4G8JaejP8Xa6W46PzJEwisNgBXMvFcz78N6zG/ARw=
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 github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/internal v1.0.0/go.mod h1:bTSOgj05NGRuHHhQwAdPnYr9TOdNmKlZTgGLL6nyAdI=
-github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161 h1:L/gRVlceqvL25UVaW/CKtUDjefjrs0SPonmDGUVOYP0=
-github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E=
 github.com/Azure/go-autorest v14.2.0+incompatible h1:V5VMDjClD3GiElqLWO7mz2MxNAK/vTfRHdAubSIPRgs=
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 github.com/Azure/go-autorest/autorest v0.11.29 h1:I4+HL/JDvErx2LjyzaVxllw2lRDB5/BT2Bm4g20iqYw=
@@ -53,12 +53,11 @@ github.com/Azure/go-autorest/tracing v0.6.0 h1:TYi4+3m5t6K48TGI9AUdb+IzbnSxvnvUM
 github.com/Azure/go-autorest/tracing v0.6.0/go.mod h1:+vhtPC754Xsa23ID7GlGsrdKBpUA79WCAKPPZVC2DeU=
 github.com/AzureAD/microsoft-authentication-library-for-go v1.2.2 h1:XHOnouVk1mxXfQidrMEnLlPk9UMeRtyBTnEFtxkV0kU=
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-github.com/Masterminds/semver/v3 v3.2.1 h1:RN9w6+7QoMeJVGyfmbcgs28Br8cvmnucEXnY0rYXWg0=
-github.com/Masterminds/semver/v3 v3.2.1/go.mod h1:qvl/7zhW3nngYb5+80sSMF+FG2BjYrf8m9wsX0PNOMQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/Masterminds/semver/v3 v3.3.0 h1:B8LGeaivUe71a5qox1ICM/JLl0NqZSW5CHyL+hmvYS0=
+github.com/Masterminds/semver/v3 v3.3.0/go.mod h1:4V+yj/TJE1HU9XfppCwVMZq3I84lprf4nC11bSS5beM=
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-github.com/Microsoft/hcsshim v0.12.3 h1:LS9NXqXhMoqNCplK1ApmVSfB4UnVLRDWRapB6EIlxE0=
-github.com/Microsoft/hcsshim v0.12.3/go.mod h1:Iyl1WVpZzr+UkzjekHZbV8o5Z9ZkxNGx6CtY2Qg/JVQ=
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@@ -95,52 +94,54 @@ github.com/arbovm/levenshtein v0.0.0-20160628152529-48b4e1c0c4d0 h1:jfIu9sQUG6Ig
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@@ -245,16 +243,13 @@ github.com/go-ini/ini v1.67.0 h1:z6ZrTEZqSWOTyH2FlglNbNgARyHG8oLW9gMELqKr06A=
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@@ -278,8 +273,8 @@ github.com/go-openapi/validate v0.24.0/go.mod h1:iyeX1sEufmv3nPbBdX3ieNviWnOZaJ1
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@@ -290,39 +285,45 @@ github.com/golang-jwt/jwt/v4 v4.5.0 h1:7cYmW1XlMY7h7ii7UhUyChSgS5wUJEnm9uZVTGqOW
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@@ -330,18 +331,19 @@ github.com/google/go-querystring v1.1.0/go.mod h1:Kcdr2DB4koayq7X8pmAG4sNG59So17
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@@ -355,8 +357,8 @@ github.com/hashicorp/go-hclog v1.6.3 h1:Qr2kF+eVWjTiYmU7Y31tYlP1h0q/X3Nl3tPGdaB1
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@@ -367,8 +369,8 @@ github.com/hashicorp/go-sockaddr v1.0.5 h1:dvk7TIXCZpmfOlM+9mlcrWmWjw/wlKT+VDq2w
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@@ -381,8 +383,8 @@ github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2
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@@ -583,43 +565,30 @@ github.com/syndtr/goleveldb v1.0.1-0.20220721030215-126854af5e6d h1:vfofYNRScrDd
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@@ -628,28 +597,26 @@ go.mongodb.org/mongo-driver v1.15.0 h1:rJCKC8eEliewXjZGf0ddURtl7tTVy1TK3bfl0gkUS
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@@ -662,22 +629,29 @@ golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPh
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@@ -686,56 +660,51 @@ golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug
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@@ -743,44 +712,59 @@ golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
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 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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@@ -800,8 +784,10 @@ gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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 k8s.io/apimachinery v0.28.3 h1:B1wYx8txOaCQG0HmYF6nbpU8dg6HvA06x5tEffvOe7A=
@@ -812,12 +798,12 @@ k8s.io/klog/v2 v2.120.1 h1:QXU6cPEOIslTGvZaXvFWiP9VKyeet3sawzTOvdXb4Vw=
 k8s.io/klog/v2 v2.120.1/go.mod h1:3Jpz1GvMt720eyJH1ckRHK1EDfpxISzJ7I9OYgaDtPE=
 k8s.io/kube-openapi v0.0.0-20231010175941-2dd684a91f00 h1:aVUu9fTY98ivBPKR9Y5w/AuzbMm96cd3YHRTU83I780=
 k8s.io/kube-openapi v0.0.0-20231010175941-2dd684a91f00/go.mod h1:AsvuZPBlUDVuCdzJ87iajxtXuR9oktsTctW/R9wwouA=
-k8s.io/utils v0.0.0-20230726121419-3b25d923346b h1:sgn3ZU783SCgtaSJjpcVVlRqd6GSnlTLKgpAAttJvpI=
-k8s.io/utils v0.0.0-20230726121419-3b25d923346b/go.mod h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0=
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 sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd h1:EDPBXCAspyGV4jQlpZSudPeMmr1bNJefnuqLsRAsHZo=
 sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd/go.mod h1:B8JuhiUyNFVKdsE8h686QcCxMaH6HrOAZj4vswFpcB0=
-sigs.k8s.io/release-utils v0.7.7 h1:JKDOvhCk6zW8ipEOkpTGDH/mW3TI+XqtPp16aaQ79FU=
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internal/embed/embedded-roots/1.root-dev.json

@@ -1,42 +1,42 @@
 {
  "signatures": [
   {
-   "keyid": "b7474a42f2588fa92ed4a2ebea6047a7b1b2f7351f1cfe0912732c0d0fb0fc09",
-   "sig": "3064023037bbb03c3472b140572a7d5a2895bd80e74435bbcb7053949731f81b104c6d05a0876590cd6a2e94d7ed619426a2f6fa02303adc8c9006fa5506fdd7ea87d2960074a537ad8bf2459f2863e806b47682cbb2f9b01b7502eaf5437a1a68fdaaeac114"
+   "keyid": "76d0a7e1ff8617ce99627d0fa5c9809f2c0f0d52e0bf65c7b84c031608d25221",
+   "sig": "3065023000f7d0a866576e94eaabc173b9233d4c8fcfa495527088f9022dff5a553f7a457da1015a6d0fc714f84848ec627387360231009fa70b2eebbe15241a2ec9b96a094ebd28661e30b8c3d1eab8d694df2b340bda511c489393630c9a9dacde42c99e9fa1"
   }
  ],
  "signed": {
   "_type": "root",
   "consistent_snapshot": true,
-  "expires": "2034-04-02T17:00:22Z",
+  "expires": "2034-05-29T20:14:11Z",
   "keys": {
-   "198f00ff96ea7cbfa7eac480cc9bfc43ce13bb434b901011ab777856533997d3": {
-    "keytype": "ecdsa",
-    "keyval": {
-     "public": "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEgDpP6O0sEt2R+l84WlfmqPBsFSby\nxJsJ6YmeUVgDk/wk9++8IAR6YBYewaKye56gMnIYjTFbyOI8WomA2NQFBw==\n-----END PUBLIC KEY-----\n"
-    },
-    "scheme": "ecdsa-sha2-nistp256",
-    "x-tuf-on-ci-online-uri": "awskms:arn:aws:kms:us-east-1:175142243308:key/fbd8dab6-5677-4b57-87e6-8369c45b3b61"
-   },
-   "b7474a42f2588fa92ed4a2ebea6047a7b1b2f7351f1cfe0912732c0d0fb0fc09": {
+   "76d0a7e1ff8617ce99627d0fa5c9809f2c0f0d52e0bf65c7b84c031608d25221": {
     "keytype": "ecdsa",
     "keyval": {
      "public": "-----BEGIN PUBLIC KEY-----\nMHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE3+asmp2GD6UijwWvMezwVG/BwFLuQa3o\nT6eRxFvkILGpVDbZ92ZYWidHl9LZ/eJUjhIjuVEkNVKoenw5KjKl8veP3MthZrQA\nSkYytOIwkidZo9Rk2dczbDcFSJvLGsmd\n-----END PUBLIC KEY-----\n"
     },
     "scheme": "ecdsa-sha2-nistp384",
     "x-tuf-on-ci-keyowner": "@mrjoelkamp"
+   },
+   "bdd1703ecbde8812614b112a6551d58de3ad681048fd90fca2a3e491edd8afe5": {
+    "keytype": "ecdsa",
+    "keyval": {
+     "public": "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEgDpP6O0sEt2R+l84WlfmqPBsFSby\nxJsJ6YmeUVgDk/wk9++8IAR6YBYewaKye56gMnIYjTFbyOI8WomA2NQFBw==\n-----END PUBLIC KEY-----\n"
+    },
+    "scheme": "ecdsa-sha2-nistp256",
+    "x-tuf-on-ci-online-uri": "awskms:arn:aws:kms:us-east-1:175142243308:key/fbd8dab6-5677-4b57-87e6-8369c45b3b61"
    }
   },
   "roles": {
    "root": {
     "keyids": [
-     "b7474a42f2588fa92ed4a2ebea6047a7b1b2f7351f1cfe0912732c0d0fb0fc09"
+     "76d0a7e1ff8617ce99627d0fa5c9809f2c0f0d52e0bf65c7b84c031608d25221"
     ],
     "threshold": 1
    },
    "snapshot": {
     "keyids": [
-     "198f00ff96ea7cbfa7eac480cc9bfc43ce13bb434b901011ab777856533997d3"
+     "bdd1703ecbde8812614b112a6551d58de3ad681048fd90fca2a3e491edd8afe5"
     ],
     "threshold": 1,
     "x-tuf-on-ci-expiry-period": 3650,
@@ -44,13 +44,13 @@
    },
    "targets": {
     "keyids": [
-     "b7474a42f2588fa92ed4a2ebea6047a7b1b2f7351f1cfe0912732c0d0fb0fc09"
+     "76d0a7e1ff8617ce99627d0fa5c9809f2c0f0d52e0bf65c7b84c031608d25221"
     ],
     "threshold": 1
    },
    "timestamp": {
     "keyids": [
-     "198f00ff96ea7cbfa7eac480cc9bfc43ce13bb434b901011ab777856533997d3"
+     "bdd1703ecbde8812614b112a6551d58de3ad681048fd90fca2a3e491edd8afe5"
     ],
     "threshold": 1,
     "x-tuf-on-ci-expiry-period": 3650,

internal/embed/embedded-roots/1.root.json

@@ -0,0 +1,152 @@
+{
+ "signatures": [
+  {
+   "keyid": "08d6f4ca1d0be93a6ceddca15051c0aeec6b98c73e29f3a714de301042d6eeee",
+   "sig": "306502307ddba543fbd1b9e2ccbee604349024e62bbb1a37906bbd5605a7403fbdb51b701b52f5fcd1b0a0ebfaeef97fa9c344f8023100c37ab675fe96b3976469a5e0cc8a5ffb5d8d6de15020f493d7cf28b0c7e60f450b65c02bfbac0e40642863a1ae3bfa4a"
+  },
+  {
+   "keyid": "3ebd40525193d7628d0b9eccd4771df7297bc87519ec6f312863bb4470966bea",
+   "sig": "3065023100bc963925fb139dd65653b5e9640572876c5bcd0a3f8bb81e4b0cbd397c10ec4fa0aed7942d77ec78b865e14c72e20e76023043ce7ff39067f054d6d2eaca5dd5176b2c25e27bd763b4ef873aaf4c75762bfb085bb766613692b68206ea0df2863426"
+  },
+  {
+   "keyid": "9c8e1be7d8d0e30656adc81ac201e05cb47a5a097d4d301fd121b77c320231c4",
+   "sig": "306502307e82d7bc0c66074b06cfc13bac3761c8f677eef252c08448eb33c0249569500e8be2a1ae78c87b5888ed80d088f97fbb023100c358c6ebe18d237bae9a9daeaf2db82297cda8eca635fc22719142740fb23b32eac0341754dd2a85b684c46e3a087ada"
+  },
+  {
+   "keyid": "373d0a38247919a78cf400cf9a90abb9aa23a3c3dce1deee995fdd6a81507117",
+   "sig": "306402305d9b5fdf3b24240b266a7ae7e02bbcadce8e06f8c111dcef03282faa0baaffb8114653cecda3da115d7859f657508d4f02304b5939fc4404f9e1e8b9d3eb49e195a779b501bd4000cef6cff7a8e657020176dae99cce2a7300b88e549d427278309c"
+  },
+  {
+   "keyid": "48a873aa6c4189804228590af4d48ee5ad3b76417592efdbcef2532401925669",
+   "sig": "306402306bc5f44621c0d6e18ce16155ebc7890def8fb283859175f7a8425190f0f233e4270b2688df05b017cfc852dee30f9f5b023016572d059d6f27968976df2aaff8238ee0970cea229e5ef30350f2c91347b04e794683da69cf6afe6cf9206dcebc81f4"
+  }
+ ],
+ "signed": {
+  "_type": "root",
+  "consistent_snapshot": true,
+  "expires": "2025-06-04T15:05:22Z",
+  "keys": {
+   "08d6f4ca1d0be93a6ceddca15051c0aeec6b98c73e29f3a714de301042d6eeee": {
+    "keytype": "ecdsa",
+    "keyval": {
+     "public": "-----BEGIN PUBLIC KEY-----\nMHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEC4ggHc/D9koyS1/AMNsMGiydM2jDzdsI\nrkC/nyZf8d4UtYJJRxuFRfmyKw9Mh0Ulw/IIyf8ZW2NsnkHgJwGre9/Ici6uomOX\n8yAOlX0Du/oAa7v4igCG7tsW0Z1ljAID\n-----END PUBLIC KEY-----\n"
+    },
+    "scheme": "ecdsa-sha2-nistp384",
+    "x-tuf-on-ci-keyowner": "@jeanlaurent"
+   },
+   "2ff207ae7d7b595ef69589622067ef5b6668e1a43081377d942ed8749fa919b4": {
+    "keytype": "ecdsa",
+    "keyval": {
+     "public": "-----BEGIN PUBLIC KEY-----\nMHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE5pyJ/RXlRO/a2WBSAprikm+VVPqZGC1M\nqgVXE3avwqb9d9lPc9Cphfd4CIAzPCKgeUkGMzQWcC1OwVjOwiB+GRq2Owf7T8pa\nKUe/zRoLjAlUnzUITHP226L1DmQ6Swos\n-----END PUBLIC KEY-----\n"
+    },
+    "scheme": "ecdsa-sha2-nistp384",
+    "x-tuf-on-ci-keyowner": "@kipz"
+   },
+   "373d0a38247919a78cf400cf9a90abb9aa23a3c3dce1deee995fdd6a81507117": {
+    "keytype": "ecdsa",
+    "keyval": {
+     "public": "-----BEGIN PUBLIC KEY-----\nMHYwEAYHKoZIzj0CAQYFK4EEACIDYgAER2zST05lNvybLsSe4UA/hiUrJbA6aFyz\nDimwewwbHvw+gt29EHYtHPqTlO/hSZD5vqZ94Cga9rDsOm3eI5bPkPHApUjw4W7u\n5lDnxuuFKluQ7EiUbswUN0ONTPnmY7Wo\n-----END PUBLIC KEY-----\n"
+    },
+    "scheme": "ecdsa-sha2-nistp384",
+    "x-tuf-on-ci-keyowner": "@binman-docker"
+   },
+   "3ebd40525193d7628d0b9eccd4771df7297bc87519ec6f312863bb4470966bea": {
+    "keytype": "ecdsa",
+    "keyval": {
+     "public": "-----BEGIN PUBLIC KEY-----\nMHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE9C53JKQtD1RYLiSwmR4XRhI7jf28W9TK\nhV3aXW0Z87JyJ4wGNOFnGRE6PuEh7Bbu4ecH0PpsEoirWzzRIgBMR3yHVCSkFBDu\nqfycsInCTAS1jvzLiDHciKXENxAWARHj\n-----END PUBLIC KEY-----\n"
+    },
+    "scheme": "ecdsa-sha2-nistp384",
+    "x-tuf-on-ci-keyowner": "@ingshtrom"
+   },
+   "48a873aa6c4189804228590af4d48ee5ad3b76417592efdbcef2532401925669": {
+    "keytype": "ecdsa",
+    "keyval": {
+     "public": "-----BEGIN PUBLIC KEY-----\nMHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEpQrE8o+fz6kBrs3TD6zqcDPwRZf3FxOX\n+SiT0k3SL1JHsMbxwFAKq+wJzqpqbhzFySuO1VVT93xNDd/rmjEU6HSY7wvT0m/l\nZ0S7yIwl3UnlplzKUYg/8wWJM0C2Qdpj\n-----END PUBLIC KEY-----\n"
+    },
+    "scheme": "ecdsa-sha2-nistp384",
+    "x-tuf-on-ci-keyowner": "@cdupuis"
+   },
+   "6132f1f2dd14bf3e9ba1a8df4c8435a77d2fd57f4a99bbb699ae61f85907818e": {
+    "keytype": "ecdsa",
+    "keyval": {
+     "public": "-----BEGIN PUBLIC KEY-----\nMHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEkFPn3WTH/xVIEFhdP/TCqtnuiOqdgb/v\nEIBjng1TBCVmr7NnW4y4bdZG4Tf9OVTSqlJzuUFThJT/JQR3M7xEzW9WJqUfBTS1\nUuF980elHtMpRkS3NtRp/T0IrkH7+COa\n-----END PUBLIC KEY-----\n"
+    },
+    "scheme": "ecdsa-sha2-nistp384",
+    "x-tuf-on-ci-keyowner": "@jonnystoten"
+   },
+   "9c8e1be7d8d0e30656adc81ac201e05cb47a5a097d4d301fd121b77c320231c4": {
+    "keytype": "ecdsa",
+    "keyval": {
+     "public": "-----BEGIN PUBLIC KEY-----\nMHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEWDreR+iXRtTStv5zmCLGoSmvvfV9/agY\nkx4O1XpRinBwAAA/IO4MI+YCoY0EQpKlSxl0DoVe6hmiXq2ezjTbebGDO66+fTZH\nkrr4KiCsZ8QcdPAR2cUvXkgyBp0WtYYS\n-----END PUBLIC KEY-----\n"
+    },
+    "scheme": "ecdsa-sha2-nistp384",
+    "x-tuf-on-ci-keyowner": "@rachel-taylor-docker"
+   },
+   "aef160e03958d5346c903dda755c07e952127ef523df5ec33bd9b24d41fe1cf4": {
+    "keytype": "ecdsa",
+    "keyval": {
+     "public": "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE5gH1kg/MZeiF/GO222hxMerv7MBC\nn91IJG8BbYWKmqZm2za+/QDyrMZExTguYlutu77jZqbkRZEFb/LbL4Ntuw==\n-----END PUBLIC KEY-----\n"
+    },
+    "scheme": "ecdsa-sha2-nistp256",
+    "x-tuf-on-ci-online-uri": "awskms:arn:aws:kms:us-east-1:654654578585:key/751429f1-0aea-4bd8-b450-bb1bce6b058f"
+   },
+   "cda750ab29ce33e19ad2fdee4204ad0190b0a33f79e1c5c18a38992d576143d7": {
+    "keytype": "ecdsa",
+    "keyval": {
+     "public": "-----BEGIN PUBLIC KEY-----\nMHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEYTPARe9DPvvVVf7ch5fTVWXtS9FS97lh\nyZr3Pk33qRprnVB9u7BaEzvQtTYycPO7cmYW5yTOC5ZZa9p2B/v15bOK4NTU0WTT\nXTwSgKmJDh8CD/PBp386S8cwyyIp7NiR\n-----END PUBLIC KEY-----\n"
+    },
+    "scheme": "ecdsa-sha2-nistp384",
+    "x-tuf-on-ci-keyowner": "@whalelines"
+   },
+   "f2149d8b7c1ece56d87d81f27fa68b745efc841892b3acfa382ad7f611e612ec": {
+    "keytype": "ecdsa",
+    "keyval": {
+     "public": "-----BEGIN PUBLIC KEY-----\nMHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEtWRLfl1pLhd5pn4gOmiCQwxE68U0+mIl\n1sU9ugeUz2aCZ9GcTjDNFE/7ZOat74ajeaFi9zmdeCi3UTYioLXNOXfbN6mxM9iQ\nGG3Z5OWYsZpeAv+5jhly2JeWUhFTuJpd\n-----END PUBLIC KEY-----\n"
+    },
+    "scheme": "ecdsa-sha2-nistp384",
+    "x-tuf-on-ci-keyowner": "@mrjoelkamp"
+   }
+  },
+  "roles": {
+   "root": {
+    "keyids": [
+     "08d6f4ca1d0be93a6ceddca15051c0aeec6b98c73e29f3a714de301042d6eeee",
+     "3ebd40525193d7628d0b9eccd4771df7297bc87519ec6f312863bb4470966bea",
+     "9c8e1be7d8d0e30656adc81ac201e05cb47a5a097d4d301fd121b77c320231c4",
+     "373d0a38247919a78cf400cf9a90abb9aa23a3c3dce1deee995fdd6a81507117",
+     "48a873aa6c4189804228590af4d48ee5ad3b76417592efdbcef2532401925669"
+    ],
+    "threshold": 3
+   },
+   "snapshot": {
+    "keyids": [
+     "aef160e03958d5346c903dda755c07e952127ef523df5ec33bd9b24d41fe1cf4"
+    ],
+    "threshold": 1,
+    "x-tuf-on-ci-expiry-period": 365,
+    "x-tuf-on-ci-signing-period": 60
+   },
+   "targets": {
+    "keyids": [
+     "f2149d8b7c1ece56d87d81f27fa68b745efc841892b3acfa382ad7f611e612ec",
+     "2ff207ae7d7b595ef69589622067ef5b6668e1a43081377d942ed8749fa919b4",
+     "6132f1f2dd14bf3e9ba1a8df4c8435a77d2fd57f4a99bbb699ae61f85907818e",
+     "cda750ab29ce33e19ad2fdee4204ad0190b0a33f79e1c5c18a38992d576143d7"
+    ],
+    "threshold": 2
+   },
+   "timestamp": {
+    "keyids": [
+     "aef160e03958d5346c903dda755c07e952127ef523df5ec33bd9b24d41fe1cf4"
+    ],
+    "threshold": 1,
+    "x-tuf-on-ci-expiry-period": 2,
+    "x-tuf-on-ci-signing-period": 1
+   }
+  },
+  "spec_version": "1.0.31",
+  "version": 1,
+  "x-tuf-on-ci-expiry-period": 365,
+  "x-tuf-on-ci-signing-period": 60
+ }
+}

internal/embed/root.go

@@ -2,12 +2,46 @@ package embed
 
 import (
 	_ "embed"
+	"fmt"
 )
 
 //go:embed embedded-roots/1.root-dev.json
-var DevRoot []byte
+var devRoot []byte
 
 //go:embed embedded-roots/1.root-staging.json
-var StagingRoot []byte
+var stagingRoot []byte
 
-var DefaultRoot = StagingRoot
+//go:embed embedded-roots/1.root.json
+var prodRoot []byte
+
+var defaultRoot = prodRoot
+
+type (
+	RootName     string
+	EmbeddedRoot struct {
+		Data []byte
+		Name RootName
+	}
+)
+
+var (
+	RootDev     = EmbeddedRoot{Data: devRoot, Name: "dev"}
+	RootStaging = EmbeddedRoot{Data: stagingRoot, Name: "staging"}
+	RootProd    = EmbeddedRoot{Data: prodRoot, Name: "prod"}
+	RootDefault = EmbeddedRoot{Data: defaultRoot, Name: ""}
+)
+
+func GetRootFromName(root string) (*EmbeddedRoot, error) {
+	switch root {
+	case string(RootDev.Name):
+		return &RootDev, nil
+	case string(RootStaging.Name):
+		return &RootStaging, nil
+	case string(RootProd.Name):
+		return &RootProd, nil
+	case string(RootDefault.Name):
+		return &RootDefault, nil
+	default:
+		return nil, fmt.Errorf("invalid tuf root: %s", root)
+	}
+}

internal/test/test.go

@@ -2,34 +2,38 @@ package test
 
 import (
 	"context"
-	"encoding/base64"
-	"encoding/json"
+	"crypto"
+	"crypto/x509"
+	_ "embed"
+	"encoding/pem"
 	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"net/http/httptest"
 	"os"
 	"path/filepath"
 	"strings"
 	"testing"
 
-	"github.com/docker/attest/pkg/attestation"
-	"github.com/docker/attest/pkg/policy"
-	"github.com/docker/attest/pkg/signerverifier"
-	"github.com/docker/attest/pkg/tlog"
-	v1 "github.com/google/go-containerregistry/pkg/v1"
-	"github.com/google/go-containerregistry/pkg/v1/layout"
-	"github.com/google/go-containerregistry/pkg/v1/partial"
-	intoto "github.com/in-toto/in-toto-golang/in_toto"
+	"github.com/docker/attest/signerverifier"
+	"github.com/docker/attest/useragent"
+	"github.com/google/go-containerregistry/pkg/registry"
 	"github.com/secure-systems-lab/go-securesystemslib/dsse"
 )
 
 const (
-	USE_MOCK_TL     = true
-	USE_MOCK_KMS    = true
-	USE_MOCK_POLICY = true
+	UseMockKMS = true
 
-	AwsRegion    = "us-east-1"
-	AwsKmsKeyArn = "arn:aws:kms:us-east-1:175142243308:alias/doi-signing" // sandbox
+	AWSRegion    = "us-east-1"
+	AWSKMSKeyARN = "arn:aws:kms:us-east-1:175142243308:alias/doi-signing" // sandbox
 )
 
+func UnsignedTestImage(rel ...string) string {
+	rel = append(rel, "test", "testdata", "unsigned-test-image")
+	return filepath.Join(rel...)
+}
+
 func CreateTempDir(t *testing.T, dir, pattern string) string {
 	// Create a temporary directory for output oci layout
 	tempDir, err := os.MkdirTemp(dir, pattern)
@@ -46,34 +50,24 @@ func CreateTempDir(t *testing.T, dir, pattern string) string {
 	return tempDir
 }
 
+//go:embed test-signing-key.pem
+var signingKey []byte
+
+func GetMockSigner(_ context.Context) (dsse.SignerVerifier, error) {
+	return signerverifier.LoadKeyPair(signingKey)
+}
+
 func Setup(t *testing.T) (context.Context, dsse.SignerVerifier) {
-	var tl tlog.TL
-	if USE_MOCK_TL {
-		tl = tlog.GetMockTL()
-	} else {
-		tl = &tlog.RekorTL{}
-	}
-
-	ctx := tlog.WithTL(context.Background(), tl)
-
-	var policyEvaluator policy.PolicyEvaluator
-	if USE_MOCK_POLICY {
-		policyEvaluator = policy.GetMockPolicy()
-	} else {
-		policyEvaluator = policy.NewRegoEvaluator(true)
-	}
-
-	ctx = policy.WithPolicyEvaluator(ctx, policyEvaluator)
-
+	ctx := context.Background()
 	var signer dsse.SignerVerifier
 	var err error
-	if USE_MOCK_KMS {
+	if UseMockKMS {
 		signer, err = GetMockSigner(ctx)
 		if err != nil {
 			t.Fatal(err)
 		}
 	} else {
-		signer, err = signerverifier.GetAWSSigner(ctx, AwsKmsKeyArn, AwsRegion)
+		signer, err = signerverifier.GetAWSSigner(ctx, AWSKMSKeyARN, AWSRegion)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -82,114 +76,30 @@ func Setup(t *testing.T) (context.Context, dsse.SignerVerifier) {
 	return ctx, signer
 }
 
-func GetMockSigner(ctx context.Context) (dsse.SignerVerifier, error) {
-	priv, err := os.ReadFile(filepath.Join("..", "..", "test", "testdata", "test-signing-key.pem"))
-	if err != nil {
-		return nil, err
-	}
-	return signerverifier.LoadKeyPair(priv)
+func NewLocalRegistry(ctx context.Context, options ...registry.Option) *httptest.Server {
+	options = append(options, registry.Logger(log.New(io.Discard, "", log.LstdFlags)))
+	regHandler := registry.New(options...)
+	return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Check the user agent
+		ua := r.Header.Get("User-Agent")
+		userAgent := useragent.Get(ctx)
+		if !strings.HasPrefix(ua, userAgent) {
+			http.Error(w, fmt.Sprintf("expected user agent to contain %q, got %q", userAgent, ua), http.StatusForbidden)
+		}
+		regHandler.ServeHTTP(w, r)
+	}))
 }
 
-type AnnotatedStatement struct {
-	OCIDescriptor   *v1.Descriptor
-	InTotoStatement *intoto.Statement
-	Annotations     map[string]string
-}
-
-func ExtractStatementsFromIndex(idx v1.ImageIndex, mediaType string) ([]*AnnotatedStatement, error) {
-	mfs2, err := idx.IndexManifest()
-	if err != nil {
-		return nil, fmt.Errorf("failed to extract IndexManifest from ImageIndex: %w", err)
-	}
-
-	var statements []*AnnotatedStatement
-
-	for _, mf := range mfs2.Manifests {
-		if mf.Annotations[attestation.DockerReferenceType] != "attestation-manifest" {
-			continue
-		}
-
-		attestationImage, err := idx.Image(mf.Digest)
-		if err != nil {
-			return nil, fmt.Errorf("failed to extract attestation image with digest %s: %w", mf.Digest.String(), err)
-		}
-		layers, err := attestationImage.Layers()
-		if err != nil {
-			return nil, fmt.Errorf("failed to extract layers from attestation image: %w", err)
-		}
-
-		for _, layer := range layers {
-			// parse layer blob as json
-			mt, err := layer.MediaType()
-			if err != nil {
-				return nil, fmt.Errorf("failed to get layer media type: %w", err)
-			}
-
-			if string(mt) != mediaType {
-				continue
-			}
-			r, err := layer.Uncompressed()
-			if err != nil {
-				return nil, fmt.Errorf("failed to get layer contents: %w", err)
-			}
-			defer r.Close()
-			var intotoStatement = new(intoto.Statement)
-			var desc *v1.Descriptor
-			if strings.HasSuffix(string(mt), "+dsse") {
-				var env = new(attestation.Envelope)
-				err = json.NewDecoder(r).Decode(env)
-				if err != nil {
-					return nil, fmt.Errorf("failed to decode env: %w", err)
-				}
-				payload, err := base64.StdEncoding.Strict().DecodeString(env.Payload)
-				if err != nil {
-					return nil, fmt.Errorf("failed to decode payload: %w", err)
-				}
-				err = json.Unmarshal([]byte(payload), intotoStatement)
-				if err != nil {
-					return nil, fmt.Errorf("failed to decode %s statement: %w", mediaType, err)
-				}
-			} else {
-				desc := new(v1.Descriptor)
-				err = json.NewDecoder(r).Decode(desc)
-				if err != nil {
-					return nil, fmt.Errorf("failed to decode statement: %w", err)
-				}
-			}
-
-			layerDesc, err := partial.Descriptor(layer)
-			if err != nil {
-				return nil, fmt.Errorf("failed to get descriptor for layer: %w", err)
-			}
-			annotations := make(map[string]string)
-			for k, v := range layerDesc.Annotations {
-				annotations[k] = v
-			}
-			statements = append(statements, &AnnotatedStatement{
-				OCIDescriptor:   desc,
-				InTotoStatement: intotoStatement,
-				Annotations:     annotations,
-			})
-		}
-	}
-	return statements, nil
-}
-
-func ExtractAnnotatedStatements(path string, mediaType string) ([]*AnnotatedStatement, error) {
-	idx, err := layout.ImageIndexFromPath(path)
-	if err != nil {
-		return nil, fmt.Errorf("failed to load image index: %w", err)
-	}
-
-	idxm, err := idx.IndexManifest()
-	if err != nil {
-		return nil, fmt.Errorf("failed to get digest: %w", err)
-	}
-	idxDigest := idxm.Manifests[0].Digest
-
-	mfs, err := idx.ImageIndex(idxDigest)
-	if err != nil {
-		return nil, fmt.Errorf("failed to extract ImageIndex for digest %s: %w", idxDigest.String(), err)
-	}
-	return ExtractStatementsFromIndex(mfs, mediaType)
+func PublicKeyToPEM(pubKey crypto.PublicKey) (string, error) {
+	derBytes, err := x509.MarshalPKIXPublicKey(pubKey)
+	if err != nil {
+		return "", err
+	}
+
+	pemBlock := &pem.Block{
+		Type:  "PUBLIC KEY",
+		Bytes: derBytes,
+	}
+
+	return string(pem.EncodeToMemory(pemBlock)), nil
 }

mapping/mapping.go

@@ -0,0 +1,138 @@
+package mapping
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"regexp"
+
+	"github.com/docker/attest/tuf"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"sigs.k8s.io/yaml"
+)
+
+const (
+	MappingFilename = "mapping.yaml"
+)
+
+func validateMappingsFile(mappings *policyMappingsFile) error {
+	var validationErrors []error
+	if mappings.Kind != "policy-mapping" {
+		validationErrors = append(validationErrors, fmt.Errorf("file is not of kind policy-mapping: %s", mappings.Kind))
+	}
+	if mappings.Version != "v1" {
+		validationErrors = append(validationErrors, fmt.Errorf("unsupported policy mapping file version: %s", mappings.Version))
+	}
+	for _, rule := range mappings.Rules {
+		if rule.Pattern == "" {
+			validationErrors = append(validationErrors, fmt.Errorf("rule missing pattern: %s", rule))
+		}
+		if rule.PolicyID == "" && rule.Replacement == "" {
+			validationErrors = append(validationErrors, fmt.Errorf("rule must have policy-id or replacement: %s", rule))
+		}
+		if rule.PolicyID != "" && rule.Replacement != "" {
+			validationErrors = append(validationErrors, fmt.Errorf("rule cannot have both policy-id and replacement: %s", rule))
+		}
+		if rule.Platforms != nil {
+			for _, platform := range rule.Platforms {
+				if platform == "" {
+					validationErrors = append(validationErrors, fmt.Errorf("rule has empty platform: %s", rule))
+				}
+			}
+		}
+	}
+	for _, policy := range mappings.Policies {
+		if policy.ID == "" {
+			validationErrors = append(validationErrors, fmt.Errorf("policy missing id: %s", policy.ID))
+		}
+		if len(policy.Files) == 0 {
+			validationErrors = append(validationErrors, fmt.Errorf("policy missing files: %v", policy))
+		}
+		for _, file := range policy.Files {
+			if file.Path == "" {
+				validationErrors = append(validationErrors, fmt.Errorf("file missing path: %s", file))
+			}
+		}
+	}
+
+	if len(validationErrors) > 0 {
+		return errors.Join(validationErrors...)
+	}
+
+	return nil
+}
+
+func parsePolicyMappingsFile(data []byte) (*PolicyMappings, error) {
+	mappings := &policyMappingsFile{}
+	err := yaml.Unmarshal(data, mappings)
+	if err != nil {
+		return nil, fmt.Errorf("failed to unmarshal policy mapping file: %w", err)
+	}
+	err = validateMappingsFile(mappings)
+	if err != nil {
+		return nil, fmt.Errorf("invalid policy mapping file: %w", err)
+	}
+	return expandMappingFile(mappings)
+}
+
+func LoadLocalMappings(configDir string) (*PolicyMappings, error) {
+	if configDir == "" {
+		return nil, nil
+	}
+	path := filepath.Join(configDir, MappingFilename)
+	mappingFile, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read local policy mapping file %s: %w", path, err)
+	}
+	return parsePolicyMappingsFile(mappingFile)
+}
+
+func LoadTUFMappings(tufClient tuf.Downloader, localTargetsDir string) (*PolicyMappings, error) {
+	if tufClient == nil {
+		return nil, fmt.Errorf("tuf client not set")
+	}
+	filename := MappingFilename
+	file, err := tufClient.DownloadTarget(filename, filepath.Join(localTargetsDir, filename))
+	if err != nil {
+		return nil, fmt.Errorf("failed to download policy mapping file %s: %w", filename, err)
+	}
+	return parsePolicyMappingsFile(file.Data)
+}
+
+func expandMappingFile(mappingFile *policyMappingsFile) (*PolicyMappings, error) {
+	policies := make(map[string]*PolicyMapping)
+	for _, policy := range mappingFile.Policies {
+		policies[policy.ID] = policy
+	}
+
+	var rules []*PolicyRule
+	for _, rule := range mappingFile.Rules {
+		patternRegex, err := regexp.Compile(rule.Pattern)
+		if err != nil {
+			return nil, err
+		}
+		platforms := make([]*v1.Platform, 0, len(rule.Platforms))
+		for _, platform := range rule.Platforms {
+			parsedPlatform, err := v1.ParsePlatform(platform)
+			if err != nil {
+				return nil, fmt.Errorf("failed to parse platform %s: %w", platform, err)
+			}
+			platforms = append(platforms, parsedPlatform)
+		}
+
+		rules = append(rules, &PolicyRule{
+			Pattern:     patternRegex,
+			PolicyID:    rule.PolicyID,
+			Replacement: rule.Replacement,
+			Platforms:   platforms,
+		})
+	}
+
+	return &PolicyMappings{
+		Version:  mappingFile.Version,
+		Kind:     mappingFile.Kind,
+		Policies: policies,
+		Rules:    rules,
+	}, nil
+}

mapping/mapping_test.go

@@ -0,0 +1,82 @@
+package mapping
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func newMapping() *policyMappingsFile {
+	return &policyMappingsFile{
+		Version: "v1",
+		Kind:    "policy-mapping",
+		Policies: []*PolicyMapping{
+			{
+				ID: "docker-official-images",
+				Files: []PolicyMappingFile{
+					{
+						Path: "docker.io/library/alpine",
+					},
+				},
+			},
+		},
+		Rules: []*policyRuleFile{
+			{
+				Pattern:  "docker.io/library/alpine",
+				PolicyID: "docker-official-images",
+			},
+		},
+	}
+}
+
+func TestMappingsFileValidation(t *testing.T) {
+	mappings := newMapping()
+	err := validateMappingsFile(mappings)
+	require.NoError(t, err)
+
+	mappings = newMapping()
+	mappings.Kind = "not-policy-mapping"
+	err = validateMappingsFile(mappings)
+	require.ErrorContains(t, err, "file is not of kind policy-mapping: not-policy-mapping")
+
+	mappings = newMapping()
+	mappings.Version = "v2"
+	err = validateMappingsFile(mappings)
+	require.ErrorContains(t, err, "unsupported policy mapping file version: v2")
+
+	mappings = newMapping()
+	mappings.Rules[0].Pattern = ""
+	err = validateMappingsFile(mappings)
+	require.ErrorContains(t, err, "rule missing pattern")
+
+	mappings = newMapping()
+	mappings.Rules[0].PolicyID = ""
+	err = validateMappingsFile(mappings)
+	require.ErrorContains(t, err, "rule must have policy-id or replacement")
+
+	mappings = newMapping()
+	mappings.Rules[0].PolicyID = "docker-official-images"
+	mappings.Rules[0].Replacement = "docker.io/library/alpine"
+	err = validateMappingsFile(mappings)
+	require.ErrorContains(t, err, "rule cannot have both policy-id and replacement")
+
+	mappings = newMapping()
+	mappings.Policies[0].ID = ""
+	err = validateMappingsFile(mappings)
+	require.ErrorContains(t, err, "policy missing id")
+
+	mappings = newMapping()
+	mappings.Policies[0].Files = nil
+	err = validateMappingsFile(mappings)
+	require.ErrorContains(t, err, "policy missing files")
+
+	mappings = newMapping()
+	mappings.Policies[0].Files[0].Path = ""
+	err = validateMappingsFile(mappings)
+	require.ErrorContains(t, err, "file missing path")
+
+	// multiple errors
+	mappings.Policies[0].ID = ""
+	err = validateMappingsFile(mappings)
+	require.ErrorContains(t, err, "policy missing id: \nfile missing path: {}")
+}

mapping/match.go

@@ -0,0 +1,80 @@
+package mapping
+
+import (
+	"fmt"
+
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+)
+
+type matchType string
+
+const (
+	MatchTypePolicy        matchType = "policy"
+	MatchTypeMatchNoPolicy matchType = "match_no_policy"
+	MatchTypeNoMatch       matchType = "no_match"
+)
+
+type PolicyMatch struct {
+	MatchType   matchType
+	Policy      *PolicyMapping
+	Rule        *PolicyRule
+	MatchedName string
+}
+
+func (mappings *PolicyMappings) FindPolicyMatch(imageName string, platform *v1.Platform) (*PolicyMatch, error) {
+	if mappings == nil {
+		return &PolicyMatch{MatchType: MatchTypeNoMatch, MatchedName: imageName}, nil
+	}
+	return mappings.findPolicyMatchImpl(imageName, platform, make(map[*PolicyRule]bool))
+}
+
+func (mappings *PolicyMappings) findPolicyMatchImpl(imageName string, platform *v1.Platform, matched map[*PolicyRule]bool) (*PolicyMatch, error) {
+	for _, rule := range mappings.Rules {
+		if !rule.matchesPlatform(platform) {
+			continue
+		}
+		if rule.Pattern.MatchString(imageName) {
+			switch {
+			case rule.PolicyID == "" && rule.Replacement == "":
+				return nil, fmt.Errorf("rule %s has neither policy-id nor rewrite", rule.Pattern)
+			case rule.PolicyID != "" && rule.Replacement != "":
+				return nil, fmt.Errorf("rule %s has both policy-id and rewrite", rule.Pattern)
+			case rule.PolicyID != "":
+				policy := mappings.Policies[rule.PolicyID]
+				if policy != nil {
+					return &PolicyMatch{
+						MatchType:   MatchTypePolicy,
+						Policy:      policy,
+						Rule:        rule,
+						MatchedName: imageName,
+					}, nil
+				}
+				return &PolicyMatch{
+					MatchType:   MatchTypeMatchNoPolicy,
+					Rule:        rule,
+					MatchedName: imageName,
+				}, nil
+			case rule.Replacement != "":
+				if matched[rule] {
+					return nil, fmt.Errorf("rewrite loop detected")
+				}
+				matched[rule] = true
+				imageName = rule.Pattern.ReplaceAllString(imageName, rule.Replacement)
+				return mappings.findPolicyMatchImpl(imageName, platform, matched)
+			}
+		}
+	}
+	return &PolicyMatch{MatchType: MatchTypeNoMatch}, nil
+}
+
+func (rule *PolicyRule) matchesPlatform(platform *v1.Platform) bool {
+	if len(rule.Platforms) == 0 {
+		return true
+	}
+	for i := range rule.Platforms {
+		if rule.Platforms[i].Equals(*platform) {
+			return true
+		}
+	}
+	return false
+}

mapping/match_test.go

@@ -0,0 +1,200 @@
+package mapping
+
+import (
+	"path/filepath"
+	"testing"
+
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestFindPolicyMatch(t *testing.T) {
+	defaultPlatform, err := v1.ParsePlatform("linux/amd64")
+	require.NoError(t, err)
+	testCases := []struct {
+		name               string
+		imageName          string
+		mappingDir         string
+		expectError        bool
+		expectLoadingError bool
+		expectedMatchType  matchType
+		expectedPolicyID   string
+		expectedImageName  string
+		platform           string
+	}{
+		{
+			name:       "alpine",
+			mappingDir: "doi",
+			imageName:  "docker.io/library/alpine",
+
+			expectedMatchType: MatchTypePolicy,
+			expectedPolicyID:  "docker-official-images",
+			expectedImageName: "docker.io/library/alpine",
+		},
+		{
+			name:       "no match",
+			mappingDir: "doi",
+			imageName:  "docker.io/something/else",
+
+			expectedMatchType: MatchTypeNoMatch,
+		},
+		{
+			name:       "match, no policy",
+			mappingDir: "local",
+			imageName:  "docker.io/library/alpine",
+
+			expectedMatchType: MatchTypeMatchNoPolicy,
+			expectedImageName: "docker.io/library/alpine",
+		},
+		{
+			name:       "simple rewrite",
+			mappingDir: "simple-rewrite",
+			imageName:  "mycoolmirror.org/library/alpine",
+
+			expectedMatchType: MatchTypePolicy,
+			expectedPolicyID:  "docker-official-images",
+			expectedImageName: "docker.io/library/alpine",
+		},
+		{
+			name:       "rewrite no match",
+			mappingDir: "rewrite-to-no-match",
+			imageName:  "mycoolmirror.org/library/alpine",
+
+			expectedMatchType: MatchTypeNoMatch,
+		},
+		{
+			name:       "rewrite to match, no policy",
+			mappingDir: "rewrite-to-local",
+			imageName:  "mycoolmirror.org/library/alpine",
+
+			expectedMatchType: MatchTypeMatchNoPolicy,
+			expectedImageName: "docker.io/library/alpine",
+		},
+		{
+			name:       "multiple rewrites",
+			mappingDir: "rewrite-multiple",
+			imageName:  "myevencoolermirror.org/library/alpine",
+
+			expectedMatchType: MatchTypePolicy,
+			expectedPolicyID:  "docker-official-images",
+			expectedImageName: "docker.io/library/alpine",
+		},
+		{
+			name:       "rewrite loop",
+			mappingDir: "rewrite-loop",
+			imageName:  "yin/alpine",
+
+			expectError: true,
+		},
+		{
+			name:              "alpine with platform",
+			mappingDir:        "doi",
+			imageName:         "docker.io/library/alpine",
+			platform:          "linux/amd64",
+			expectedMatchType: MatchTypePolicy,
+			expectedPolicyID:  "docker-official-images",
+			expectedImageName: "docker.io/library/alpine",
+		},
+		{
+			name:              "alpine with platform",
+			mappingDir:        "doi-platform",
+			imageName:         "docker.io/library/alpine",
+			platform:          "linux/amd64",
+			expectedMatchType: MatchTypePolicy,
+			expectedPolicyID:  "docker-official-images",
+			expectedImageName: "docker.io/library/alpine",
+		},
+		{
+			name:              "alpine with no matching platform",
+			mappingDir:        "doi-platform",
+			imageName:         "docker.io/library/alpine",
+			platform:          "linux/arm64",
+			expectedMatchType: MatchTypeNoMatch,
+			expectedPolicyID:  "docker-official-images",
+		},
+		{
+			name:              "alpine with platform",
+			mappingDir:        "doi-platform",
+			imageName:         "docker.io/library/alpine",
+			platform:          "linux/amd64",
+			expectedMatchType: MatchTypePolicy,
+			expectedPolicyID:  "docker-official-images",
+			expectedImageName: "docker.io/library/alpine",
+		},
+		{
+			name:               "alpine with invalid platform in mapping",
+			mappingDir:         "doi-platform-broken",
+			imageName:          "docker.io/library/alpine",
+			platform:           "linux/amd64",
+			expectLoadingError: true,
+		},
+		{
+			name:              "firefox with > 1 platforms in policy",
+			mappingDir:        "doi-platform",
+			imageName:         "docker.io/mozilla/firefox",
+			platform:          "linux/arm64",
+			expectedMatchType: MatchTypePolicy,
+			expectedPolicyID:  "docker-official-images",
+			expectedImageName: "docker.io/mozilla/firefox",
+		},
+		{
+			name:              "firefox with > 1 platforms in policy (no match)",
+			mappingDir:        "doi-platform",
+			imageName:         "docker.io/mozilla/firefox",
+			platform:          "macOs/arm64",
+			expectedMatchType: MatchTypeNoMatch,
+			expectedPolicyID:  "docker-official-images",
+		},
+		{
+			name:              "rewrite and platform",
+			mappingDir:        "doi-platform",
+			imageName:         "mycoolmirror.org/library/alpine",
+			platform:          "linux/amd64",
+			expectedMatchType: MatchTypePolicy,
+			expectedPolicyID:  "docker-official-images",
+			expectedImageName: "docker.io/library/alpine",
+		},
+		{
+			name:              "rewrite and platform mismatch",
+			mappingDir:        "doi-platform",
+			imageName:         "mycoolmirror.org/library/alpine",
+			platform:          "macOs/amd64",
+			expectedMatchType: MatchTypeNoMatch,
+			expectedPolicyID:  "docker-official-images",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			mappings, err := LoadLocalMappings(filepath.Join("testdata", "mappings", tc.mappingDir))
+			if tc.expectLoadingError {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+
+			platform := defaultPlatform
+			if tc.platform != "" {
+				platform, err = v1.ParsePlatform(tc.platform)
+				require.NoError(t, err)
+			}
+			match, err := mappings.FindPolicyMatch(tc.imageName, platform)
+			if tc.expectError {
+				require.Error(t, err)
+				// TODO: check error matches expected error message
+				return
+			}
+			require.NoError(t, err)
+			assert.Equal(t, tc.expectedMatchType, match.MatchType)
+			if match.MatchType == MatchTypePolicy {
+				if assert.NotNil(t, match.Policy) {
+					assert.Equal(t, tc.expectedPolicyID, match.Policy.ID)
+				}
+			}
+			if match.MatchType == MatchTypeMatchNoPolicy || match.MatchType == MatchTypePolicy {
+				assert.Equal(t, tc.expectedImageName, match.MatchedName)
+			}
+		})
+	}
+}

mapping/testdata/mappings/doi-platform-broken/mapping.yaml

@@ -0,0 +1,11 @@
+version: v1
+kind: policy-mapping
+policies:
+  - id: docker-official-images
+    description: Docker Official Images
+    files:
+      - path: doi/policy.rego
+rules:
+  - pattern: "^docker[.]io/library/(.*)$"
+    platforms: ["linux/amd64/broken/platform/spec/1.0:foobar"]
+    policy-id: docker-official-images

mapping/testdata/mappings/doi-platform/mapping.yaml

@@ -0,0 +1,17 @@
+version: v1
+kind: policy-mapping
+policies:
+  - id: docker-official-images
+    description: Docker Official Images
+    files:
+      - path: doi/policy.rego
+rules:
+  - pattern: "^docker[.]io/library/(.*)$"
+    platforms: ["linux/amd64"]
+    policy-id: docker-official-images
+  - pattern: "^docker.io/mozilla/(.*)$"
+    platforms: ["linux/amd64", "linux/arm64"]
+    policy-id: docker-official-images
+  - pattern: "^mycoolmirror[.]org/library/(.*)$"
+    platforms: ["linux/amd64"]
+    rewrite: "docker.io/library/$1"

mapping/testdata/mappings/doi/mapping.yaml

@@ -0,0 +1,10 @@
+version: v1
+kind: policy-mapping
+policies:
+  - id: docker-official-images
+    description: Docker Official Images
+    files:
+      - path: doi/policy.rego
+rules:
+  - pattern: "^docker[.]io/library/(.*)$"
+    policy-id: docker-official-images

mapping/testdata/mappings/local/mapping.yaml

@@ -0,0 +1,10 @@
+version: v1
+kind: policy-mapping
+policies:
+  - id: local-policy
+    description: Local Policy
+    files:
+      - path: local-policy.rego
+rules:
+  - pattern: "^docker[.]io/library/(.*)$"
+    policy-id: docker-official-images # note this policy does not exist in this file

mapping/testdata/mappings/rewrite-invalid/mapping.yaml

@@ -0,0 +1,13 @@
+version: v1
+kind: policy-mapping
+policies:
+  - id: docker-official-images
+    description: Docker Official Images
+    files:
+      - path: doi/policy.rego
+rules:
+  - pattern: "^docker[.]io/library/(.*)$"
+    policy-id: docker-official-images
+  - pattern: "^mycoolmirror[.]org/library/(.*)$"
+    rewrite: "docker.io/library/$1"
+    policy-id: docker-official-images # invalid to specify both rewrite and policy-id

mapping/testdata/mappings/rewrite-loop/mapping.yaml

@@ -0,0 +1,14 @@
+version: v1
+kind: policy-mapping
+policies:
+  - id: docker-official-images
+    description: Docker Official Images
+    files:
+      - path: doi/policy.rego
+rules:
+  - pattern: "^docker[.]io/library/(.*)$"
+    policy-id: docker-official-images
+  - pattern: "^yin/(.*)$"
+    rewrite: "yang/$1"
+  - pattern: "^yang/(.*)$"
+    rewrite: "yin/$1"

mapping/testdata/mappings/rewrite-multiple/mapping.yaml

@@ -0,0 +1,14 @@
+version: v1
+kind: policy-mapping
+policies:
+  - id: docker-official-images
+    description: Docker Official Images
+    files:
+      - path: doi/policy.rego
+rules:
+  - pattern: "^docker[.]io/library/(.*)$"
+    policy-id: docker-official-images
+  - pattern: "^mycoolmirror[.]org/library/(.*)$"
+    rewrite: "docker.io/library/$1"
+  - pattern: "^myevencoolermirror[.]org/library/(.*)$"
+    rewrite: "mycoolmirror.org/library/$1"

mapping/testdata/mappings/rewrite-to-local/mapping.yaml

@@ -0,0 +1,12 @@
+version: v1
+kind: policy-mapping
+policies:
+  - id: local-policy
+    description: Local Policy
+    files:
+      - path: local-policy.rego
+rules:
+  - pattern: "^docker[.]io/library/(.*)$"
+    policy-id: docker-official-images # note this policy does not exist in this file
+  - pattern: "^mycoolmirror[.]org/library/(.*)$"
+    rewrite: "docker.io/library/$1"

mapping/testdata/mappings/rewrite-to-no-match/mapping.yaml

@@ -0,0 +1,12 @@
+version: v1
+kind: policy-mapping
+policies:
+  - id: docker-official-images
+    description: Docker Official Images
+    files:
+      - path: doi/policy.rego
+rules:
+  - pattern: "^docker[.]io/library/(.*)$"
+    policy-id: docker-official-images
+  - pattern: "^mycoolmirror[.]org/library/(.*)$"
+    rewrite: "badredirect.org/$1" # no matching rule for this rewrite

mapping/testdata/mappings/simple-rewrite/mapping.yaml

@@ -0,0 +1,12 @@
+version: v1
+kind: policy-mapping
+policies:
+  - id: docker-official-images
+    description: Docker Official Images
+    files:
+      - path: doi/policy.rego
+rules:
+  - pattern: "^docker[.]io/library/(.*)$"
+    policy-id: docker-official-images
+  - pattern: "^mycoolmirror[.]org/library/(.*)$"
+    rewrite: "docker.io/library/$1"

mapping/types.go

@@ -0,0 +1,58 @@
+package mapping
+
+import (
+	"regexp"
+
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+)
+
+type policyMappingsFile struct {
+	Version  string            `json:"version"`
+	Kind     string            `json:"kind"`
+	Policies []*PolicyMapping  `json:"policies"`
+	Rules    []*policyRuleFile `json:"rules"`
+}
+
+type policyRuleFile struct {
+	Pattern     string   `json:"pattern"`
+	Platforms   []string `json:"platforms"`
+	PolicyID    string   `json:"policy-id"`
+	Replacement string   `json:"rewrite"`
+}
+
+type PolicyMappings struct {
+	Version  string
+	Kind     string
+	Policies map[string]*PolicyMapping
+	Rules    []*PolicyRule
+}
+
+type AttestationStyle string
+
+const (
+	AttestationStyleAttached  AttestationStyle = "attached"
+	AttestationStyleReferrers AttestationStyle = "referrers"
+)
+
+type PolicyMapping struct {
+	ID           string              `json:"id"`
+	Description  string              `json:"description"`
+	Files        []PolicyMappingFile `json:"files"`
+	Attestations *AttestationConfig  `json:"attestations"`
+}
+
+type AttestationConfig struct {
+	Style AttestationStyle `json:"style"`
+	Repo  string           `json:"repo"`
+}
+
+type PolicyMappingFile struct {
+	Path string `json:"path"`
+}
+
+type PolicyRule struct {
+	Pattern     *regexp.Regexp
+	PolicyID    string
+	Replacement string
+	Platforms   []*v1.Platform
+}

mirror/README.md

@@ -0,0 +1,2 @@
+## mirror
+This package contains components to mirror TUF metadata and targets to OCI.

mirror/example_mirror_test.go

@@ -1,25 +1,26 @@
 package mirror_test
 
 import (
+	"context"
 	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
 
-	"github.com/docker/attest/internal/embed"
-	"github.com/docker/attest/pkg/mirror"
-	"github.com/docker/attest/pkg/tuf"
+	"github.com/docker/attest/mirror"
+	"github.com/docker/attest/oci"
+	"github.com/docker/attest/tuf"
 	v1 "github.com/google/go-containerregistry/pkg/v1"
 )
 
 type TufMirrorOutput struct {
 	metadata          v1.Image
-	delegatedMetadata []*mirror.MirrorImage
-	targets           []*mirror.MirrorImage
-	delegatedTargets  []*mirror.MirrorIndex
+	delegatedMetadata []*mirror.Image
+	targets           []*mirror.Image
+	delegatedTargets  []*mirror.Index
 }
 
-func ExampleNewTufMirror() {
+func ExampleNewTUFMirror() {
 	home, err := os.UserHomeDir()
 	if err != nil {
 		panic(err)
@@ -29,7 +30,8 @@ func ExampleNewTufMirror() {
 	// configure TUF mirror
 	metadataURI := "https://docker.github.io/tuf-staging/metadata"
 	targetsURI := "https://docker.github.io/tuf-staging/targets"
-	m, err := mirror.NewTufMirror(embed.StagingRoot, tufOutputPath, metadataURI, targetsURI, tuf.NewMockVersionChecker())
+	ctx := context.Background()
+	m, err := mirror.NewTUFMirror(ctx, tuf.DockerTUFRootStaging.Data, tufOutputPath, metadataURI, targetsURI, tuf.NewMockVersionChecker())
 	if err != nil {
 		panic(err)
 	}
@@ -46,7 +48,7 @@ func ExampleNewTufMirror() {
 	}
 
 	// create targets manifest
-	targets, err := m.GetTufTargetMirrors()
+	targets, err := m.GetTUFTargetMirrors()
 	if err != nil {
 		panic(err)
 	}
@@ -64,7 +66,7 @@ func ExampleNewTufMirror() {
 	}
 
 	// push metadata and targets to registry (optional)
-	err = mirrorToRegistry(mirrorOutput)
+	err = mirrorToRegistry(ctx, mirrorOutput)
 	if err != nil {
 		panic(err)
 	}
@@ -77,10 +79,10 @@ func ExampleNewTufMirror() {
 	}
 }
 
-func mirrorToRegistry(o *TufMirrorOutput) error {
+func mirrorToRegistry(ctx context.Context, o *TufMirrorOutput) error {
 	// push metadata to registry
 	metadataRepo := "registry-1.docker.io/docker/tuf-metadata:latest"
-	err := mirror.PushImageToRegistry(o.metadata, metadataRepo)
+	err := oci.PushImageToRegistry(ctx, o.metadata, metadataRepo)
 	if err != nil {
 		return err
 	}
@@ -91,7 +93,7 @@ func mirrorToRegistry(o *TufMirrorOutput) error {
 			return fmt.Errorf("failed to get repo without tag: %s", metadataRepo)
 		}
 		imageName := fmt.Sprintf("%s:%s", repo, metadata.Tag)
-		err = mirror.PushImageToRegistry(metadata.Image, imageName)
+		err = oci.PushImageToRegistry(ctx, metadata.Image, imageName)
 		if err != nil {
 			return err
 		}
@@ -101,7 +103,7 @@ func mirrorToRegistry(o *TufMirrorOutput) error {
 	targetsRepo := "registry-1.docker.io/docker/tuf-targets"
 	for _, target := range o.targets {
 		imageName := fmt.Sprintf("%s:%s", targetsRepo, target.Tag)
-		err = mirror.PushImageToRegistry(target.Image, imageName)
+		err = oci.PushImageToRegistry(ctx, target.Image, imageName)
 		if err != nil {
 			return err
 		}
@@ -109,7 +111,7 @@ func mirrorToRegistry(o *TufMirrorOutput) error {
 	// push delegated targets to registry
 	for _, target := range o.delegatedTargets {
 		imageName := fmt.Sprintf("%s:%s", targetsRepo, target.Tag)
-		err = mirror.PushIndexToRegistry(target.Index, imageName)
+		err = oci.PushIndexToRegistry(ctx, target.Index, imageName)
 		if err != nil {
 			return err
 		}
@@ -119,14 +121,14 @@ func mirrorToRegistry(o *TufMirrorOutput) error {
 
 func mirrorToLocal(o *TufMirrorOutput, outputPath string) error {
 	// output metadata to local directory
-	err := mirror.SaveImageAsOCILayout(o.metadata, outputPath)
+	err := oci.SaveImageAsOCILayout(o.metadata, outputPath)
 	if err != nil {
 		return err
 	}
 	// output delegated metadata to local directory
 	for _, metadata := range o.delegatedMetadata {
 		path := filepath.Join(outputPath, metadata.Tag)
-		err = mirror.SaveImageAsOCILayout(metadata.Image, path)
+		err = oci.SaveImageAsOCILayout(metadata.Image, path)
 		if err != nil {
 			return err
 		}
@@ -135,7 +137,7 @@ func mirrorToLocal(o *TufMirrorOutput, outputPath string) error {
 	// output top-level targets to local directory
 	for _, target := range o.targets {
 		path := filepath.Join(outputPath, target.Tag)
-		err = mirror.SaveImageAsOCILayout(target.Image, path)
+		err = oci.SaveImageAsOCILayout(target.Image, path)
 		if err != nil {
 			return err
 		}
@@ -143,7 +145,7 @@ func mirrorToLocal(o *TufMirrorOutput, outputPath string) error {
 	// output delegated targets to local directory
 	for _, target := range o.delegatedTargets {
 		path := filepath.Join(outputPath, target.Tag)
-		err = mirror.SaveIndexAsOCILayout(target.Index, path)
+		err = oci.SaveIndexAsOCILayout(target.Index, path)
 		if err != nil {
 			return err
 		}

mirror/metadata.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"strconv"
 
+	"github.com/docker/attest/oci"
 	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/empty"
 	"github.com/google/go-containerregistry/pkg/v1/mutate"
@@ -16,9 +17,9 @@ import (
 // TUF root metadata
 // -----------------
 
-// GetMetadataManifest returns an image with TUF root metadata as layers
-func (m *TufMirror) GetMetadataManifest(metadataURL string) (v1.Image, error) {
-	metadata, err := m.getTufMetadataMirror(metadataURL)
+// GetMetadataManifest returns an image with TUF root metadata as layers.
+func (m *TUFMirror) GetMetadataManifest(metadataURL string) (*oci.EmptyConfigImage, error) {
+	metadata, err := m.getMetadataMirror(metadataURL)
 	if err != nil {
 		return nil, fmt.Errorf("failed to get metadata: %w", err)
 	}
@@ -26,19 +27,19 @@ func (m *TufMirror) GetMetadataManifest(metadataURL string) (v1.Image, error) {
 	if err != nil {
 		return nil, fmt.Errorf("failed to build metadata manifest: %w", err)
 	}
-	return manifest, nil
+	return &oci.EmptyConfigImage{Image: manifest}, nil
 }
 
-// getTufMetadataMirror returns a TufMetadata struct with TUF metadata as map of file names to bytes
-func (m *TufMirror) getTufMetadataMirror(metadataURL string) (*TufMetadata, error) {
-	trustedMetadata := m.TufClient.GetMetadata()
+// getMetadataMirror returns a TufMetadata struct with TUF metadata as map of file names to bytes.
+func (m *TUFMirror) getMetadataMirror(metadataURL string) (*TUFMetadata, error) {
+	trustedMetadata := m.TUFClient.GetMetadata()
 
 	rootMetadata := map[string][]byte{}
 	rootVersion := trustedMetadata.Root.Signed.Version
 	// get the previous versions of root metadata if any
 	if rootVersion != 1 {
 		var err error
-		rootMetadata, err = m.TufClient.GetPriorRoots(metadataURL)
+		rootMetadata, err = m.TUFClient.GetPriorRoots(metadataURL)
 		if err != nil {
 			return nil, fmt.Errorf("failed to get prior root metadata: %w", err)
 		}
@@ -69,7 +70,7 @@ func (m *TufMirror) getTufMetadataMirror(metadataURL string) (*TufMetadata, erro
 		snapshotVersion = strconv.FormatInt(trustedMetadata.Snapshot.Signed.Version, 10)
 		targetsVersion = strconv.FormatInt(trustedMetadata.Targets[metadata.TARGETS].Signed.Version, 10)
 	}
-	return &TufMetadata{
+	return &TUFMetadata{
 		Root:      rootMetadata,
 		Snapshot:  map[string][]byte{nameFromRole(metadata.SNAPSHOT, snapshotVersion): snapshotBytes},
 		Targets:   map[string][]byte{nameFromRole(metadata.TARGETS, targetsVersion): targetsBytes},
@@ -77,12 +78,12 @@ func (m *TufMirror) getTufMetadataMirror(metadataURL string) (*TufMetadata, erro
 	}, nil
 }
 
-// buildMetadataManifest returns an OCI image with TUF metadata as layers with annotations
-func (m *TufMirror) buildMetadataManifest(metadata *TufMetadata) (v1.Image, error) {
+// buildMetadataManifest returns an OCI image with TUF metadata as layers with annotations.
+func (m *TUFMirror) buildMetadataManifest(metadata *TUFMetadata) (v1.Image, error) {
 	img := empty.Image
 	img = mutate.MediaType(img, types.OCIManifestSchema1)
 	img = mutate.ConfigMediaType(img, types.OCIConfigJSON)
-	for _, role := range TufRoles {
+	for _, role := range TUFRoles {
 		layers, err := m.makeRoleLayers(role, metadata)
 		if err != nil {
 			return nil, fmt.Errorf("failed to make role layer: %w", err)
@@ -95,8 +96,8 @@ func (m *TufMirror) buildMetadataManifest(metadata *TufMetadata) (v1.Image, erro
 	return img, nil
 }
 
-// makeRoleLayers returns a list of layers for a given TUF role
-func (m *TufMirror) makeRoleLayers(role TufRole, tufMetadata *TufMetadata) ([]mutate.Addendum, error) {
+// makeRoleLayers returns a list of layers for a given TUF role.
+func (m *TUFMirror) makeRoleLayers(role TUFRole, tufMetadata *TUFMetadata) ([]mutate.Addendum, error) {
 	var layers []mutate.Addendum
 	ann := map[string]string{tufFileAnnotation: ""}
 	switch role {
@@ -115,8 +116,8 @@ func (m *TufMirror) makeRoleLayers(role TufRole, tufMetadata *TufMetadata) ([]mu
 	return layers, nil
 }
 
-// annotatedMetaLayers returns a list of layers with annotations for each TUF metadata file
-func (m *TufMirror) annotatedMetaLayers(meta map[string][]byte) []mutate.Addendum {
+// annotatedMetaLayers returns a list of layers with annotations for each TUF metadata file.
+func (m *TUFMirror) annotatedMetaLayers(meta map[string][]byte) []mutate.Addendum {
 	var layers []mutate.Addendum
 	for name, data := range meta {
 		ann := map[string]string{tufFileAnnotation: name}
@@ -129,8 +130,8 @@ func (m *TufMirror) annotatedMetaLayers(meta map[string][]byte) []mutate.Addendu
 // TUF delegated targets metadata
 // ------------------------------
 
-// GetDelegatedMetadataMirrors returns a list of mirrors (image/tag pairs) for each delegated targets role metadata
-func (m *TufMirror) GetDelegatedMetadataMirrors() ([]*MirrorImage, error) {
+// GetDelegatedMetadataMirrors returns a list of mirrors (image/tag pairs) for each delegated targets role metadata.
+func (m *TUFMirror) GetDelegatedMetadataMirrors() ([]*Image, error) {
 	// get current delegated targets metadata
 	delegatedTargets, err := m.getDelegatedTargetsMetadata()
 	if err != nil {
@@ -143,12 +144,12 @@ func (m *TufMirror) GetDelegatedMetadataMirrors() ([]*MirrorImage, error) {
 	return mirror, nil
 }
 
-// getDelegatedTargetsMetadata returns delegated targets metadata as a list of DelegatedTargetMetadata (role name and data)
-func (m *TufMirror) getDelegatedTargetsMetadata() ([]DelegatedTargetMetadata, error) {
+// getDelegatedTargetsMetadata returns delegated targets metadata as a list of DelegatedTargetMetadata (role name and data).
+func (m *TUFMirror) getDelegatedTargetsMetadata() ([]DelegatedTargetMetadata, error) {
 	var delegatedTargets []DelegatedTargetMetadata
-	md := m.TufClient.GetMetadata()
+	md := m.TUFClient.GetMetadata()
 	for _, role := range md.Targets[metadata.TARGETS].Signed.Delegations.Roles {
-		roleMetadata, err := m.TufClient.LoadDelegatedTargets(role.Name, metadata.TARGETS)
+		roleMetadata, err := m.TUFClient.LoadDelegatedTargets(role.Name, metadata.TARGETS)
 		if err != nil {
 			return nil, fmt.Errorf("failed to get delegated role metadata: %w", err)
 		}
@@ -170,9 +171,9 @@ func (m *TufMirror) getDelegatedTargetsMetadata() ([]DelegatedTargetMetadata, er
 	return delegatedTargets, nil
 }
 
-// buildDelegatedMetadataManifests returns a list of mirrors (image/tag pairs) for each delegated target role metadata
-func (m *TufMirror) buildDelegatedMetadataManifests(delegated []DelegatedTargetMetadata) ([]*MirrorImage, error) {
-	manifests := []*MirrorImage{}
+// buildDelegatedMetadataManifests returns a list of mirrors (image/tag pairs) for each delegated target role metadata.
+func (m *TUFMirror) buildDelegatedMetadataManifests(delegated []DelegatedTargetMetadata) ([]*Image, error) {
+	manifests := []*Image{}
 	for _, role := range delegated {
 		img := empty.Image
 		img = mutate.MediaType(img, types.OCIManifestSchema1)
@@ -183,7 +184,7 @@ func (m *TufMirror) buildDelegatedMetadataManifests(delegated []DelegatedTargetM
 		if err != nil {
 			return nil, fmt.Errorf("failed to append delegated targets layer to image: %w", err)
 		}
-		manifests = append(manifests, &MirrorImage{Image: img, Tag: role.Name})
+		manifests = append(manifests, &Image{Image: &oci.EmptyConfigImage{Image: img}, Tag: role.Name})
 	}
 	return manifests, nil
 }

mirror/metadata_test.go

@@ -1,6 +1,7 @@
 package mirror
 
 import (
+	"context"
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
@@ -9,22 +10,26 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/docker/attest/internal/embed"
 	"github.com/docker/attest/internal/test"
-	"github.com/docker/attest/pkg/tuf"
+	"github.com/docker/attest/tuf"
 	"github.com/stretchr/testify/assert"
 	"github.com/theupdateframework/go-tuf/v2/metadata"
 )
 
+const (
+	metadataPath = "/metadata"
+	targetsPath  = "/targets"
+)
+
 func TestGetTufMetadataMirror(t *testing.T) {
-	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "..", "test", "testdata", "tuf", "test-repo"))))
+	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "test", "testdata", "tuf", "test-repo"))))
 	defer server.Close()
 
 	path := test.CreateTempDir(t, "", "tuf_temp")
-	m, err := NewTufMirror(embed.DevRoot, path, server.URL+"/metadata", server.URL+"/targets", tuf.NewMockVersionChecker())
+	m, err := NewTUFMirror(context.Background(), tuf.DockerTUFRootDev.Data, path, server.URL+metadataPath, server.URL+targetsPath, tuf.NewMockVersionChecker())
 	assert.NoError(t, err)
 
-	tufMetadata, err := m.getTufMetadataMirror(server.URL + "/metadata")
+	tufMetadata, err := m.getMetadataMirror(server.URL + metadataPath)
 	assert.NoError(t, err)
 
 	// check that all roles are not empty
@@ -35,14 +40,14 @@ func TestGetTufMetadataMirror(t *testing.T) {
 }
 
 func TestGetMetadataManifest(t *testing.T) {
-	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "..", "test", "testdata", "tuf", "test-repo"))))
+	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "test", "testdata", "tuf", "test-repo"))))
 	defer server.Close()
 
 	path := test.CreateTempDir(t, "", "tuf_temp")
-	m, err := NewTufMirror(embed.DevRoot, path, server.URL+"/metadata", server.URL+"/targets", tuf.NewMockVersionChecker())
+	m, err := NewTUFMirror(context.Background(), tuf.DockerTUFRootDev.Data, path, server.URL+metadataPath, server.URL+targetsPath, tuf.NewMockVersionChecker())
 	assert.NoError(t, err)
 
-	img, err := m.GetMetadataManifest(server.URL + "/metadata")
+	img, err := m.GetMetadataManifest(server.URL + metadataPath)
 	assert.NoError(t, err)
 	assert.NotNil(t, img)
 
@@ -74,11 +79,11 @@ func TestGetMetadataManifest(t *testing.T) {
 }
 
 func TestGetDelegatedMetadataMirrors(t *testing.T) {
-	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "..", "test", "testdata", "tuf", "test-repo"))))
+	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "test", "testdata", "tuf", "test-repo"))))
 	defer server.Close()
 
 	path := test.CreateTempDir(t, "", "tuf_temp")
-	m, err := NewTufMirror(embed.DevRoot, path, server.URL+"/metadata", server.URL+"/targets", tuf.NewMockVersionChecker())
+	m, err := NewTUFMirror(context.Background(), tuf.DockerTUFRootDev.Data, path, server.URL+metadataPath, server.URL+targetsPath, tuf.NewMockVersionChecker())
 	assert.NoError(t, err)
 
 	delegations, err := m.GetDelegatedMetadataMirrors()

mirror/mirror.go

@@ -0,0 +1,19 @@
+package mirror
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/docker/attest/tuf"
+)
+
+func NewTUFMirror(ctx context.Context, root []byte, tufPath, metadataURL, targetsURL string, versionChecker tuf.VersionChecker) (*TUFMirror, error) {
+	if root == nil {
+		root = tuf.DockerTUFRootDefault.Data
+	}
+	tufClient, err := tuf.NewClient(ctx, &tuf.ClientOptions{InitialRoot: root, LocalStorageDir: tufPath, MetadataSource: metadataURL, TargetsSource: targetsURL, VersionChecker: versionChecker})
+	if err != nil {
+		return nil, fmt.Errorf("failed to create TUF client: %w", err)
+	}
+	return &TUFMirror{TUFClient: tufClient, tufPath: tufPath, metadataURL: metadataURL, targetsURL: targetsURL}, nil
+}

mirror/targets.go

@@ -5,6 +5,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	"github.com/docker/attest/oci"
 	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/empty"
 	"github.com/google/go-containerregistry/pkg/v1/mutate"
@@ -13,16 +14,16 @@ import (
 	"github.com/theupdateframework/go-tuf/v2/metadata"
 )
 
-// GetTufTargetMirrors returns a list of top-level target files as MirrorImages (image with tag)
-func (m *TufMirror) GetTufTargetMirrors() ([]*MirrorImage, error) {
-	targetMirrors := []*MirrorImage{}
-	md := m.TufClient.GetMetadata()
+// GetTUFTargetMirrors returns a list of top-level target files as MirrorImages (image with tag).
+func (m *TUFMirror) GetTUFTargetMirrors() ([]*Image, error) {
+	targetMirrors := []*Image{}
+	md := m.TUFClient.GetMetadata()
 
 	// for each top-level target file, create an image with the target file as a layer
 	targets := md.Targets[metadata.TARGETS].Signed.Targets
 	for _, t := range targets {
 		// download target file
-		_, data, err := m.TufClient.DownloadTarget(t.Path, filepath.Join(m.tufPath, "download"))
+		file, err := m.TUFClient.DownloadTarget(t.Path, filepath.Join(m.tufPath, "download"))
 		if err != nil {
 			return nil, fmt.Errorf("failed to download target %s: %w", t.Path, err)
 		}
@@ -37,21 +38,21 @@ func (m *TufMirror) GetTufTargetMirrors() ([]*MirrorImage, error) {
 		}
 		name := hash.String() + "." + t.Path
 		ann := map[string]string{tufFileAnnotation: name}
-		layer := mutate.Addendum{Layer: static.NewLayer(data, tufTargetMediaType), Annotations: ann}
+		layer := mutate.Addendum{Layer: static.NewLayer(file.Data, tufTargetMediaType), Annotations: ann}
 		img, err = mutate.Append(img, layer)
 		if err != nil {
 			return nil, fmt.Errorf("failed to append role layer to image: %w", err)
 		}
-		targetMirrors = append(targetMirrors, &MirrorImage{Image: img, Tag: name})
+		targetMirrors = append(targetMirrors, &Image{Image: &oci.EmptyConfigImage{Image: img}, Tag: name})
 	}
 	return targetMirrors, nil
 }
 
 // GetDelegatedTargetMirrors returns a list of delegated target files as MirrorIndexes (image index with tag)
-// each image in the index contains a delegated target file
-func (m *TufMirror) GetDelegatedTargetMirrors() ([]*MirrorIndex, error) {
-	mirror := []*MirrorIndex{}
-	md := m.TufClient.GetMetadata()
+// each image in the index contains a delegated target file.
+func (m *TUFMirror) GetDelegatedTargetMirrors() ([]*Index, error) {
+	mirror := []*Index{}
+	md := m.TUFClient.GetMetadata()
 
 	// for each delegated role, create an image index with target files as images
 	roles := md.Targets[metadata.TARGETS].Signed.Delegations.Roles
@@ -60,7 +61,7 @@ func (m *TufMirror) GetDelegatedTargetMirrors() ([]*MirrorIndex, error) {
 		index := v1.ImageIndex(empty.Index)
 
 		// get delegated targets metadata for role
-		roleMeta, err := m.TufClient.LoadDelegatedTargets(role.Name, metadata.TARGETS)
+		roleMeta, err := m.TUFClient.LoadDelegatedTargets(role.Name, metadata.TARGETS)
 		if err != nil {
 			return nil, fmt.Errorf("failed to load delegated targets metadata: %w", err)
 		}
@@ -68,7 +69,7 @@ func (m *TufMirror) GetDelegatedTargetMirrors() ([]*MirrorIndex, error) {
 		// for each target file, create an image with the target file as a layer
 		for _, target := range roleMeta.Signed.Targets {
 			// download target file
-			_, data, err := m.TufClient.DownloadTarget(target.Path, filepath.Join(m.tufPath, "download"))
+			file, err := m.TUFClient.DownloadTarget(target.Path, filepath.Join(m.tufPath, "download"))
 			if err != nil {
 				return nil, fmt.Errorf("failed to download target %s: %w", target.Path, err)
 			}
@@ -88,14 +89,15 @@ func (m *TufMirror) GetDelegatedTargetMirrors() ([]*MirrorIndex, error) {
 			}
 			name := hash.String() + "." + filename
 			ann := map[string]string{tufFileAnnotation: name}
-			layer := mutate.Addendum{Layer: static.NewLayer(data, tufTargetMediaType), Annotations: ann}
+			layer := mutate.Addendum{Layer: static.NewLayer(file.Data, tufTargetMediaType), Annotations: ann}
 			img, err = mutate.Append(img, layer)
 			if err != nil {
 				return nil, fmt.Errorf("failed to append role layer to image: %w", err)
 			}
+			emptyConfigImage := &oci.EmptyConfigImage{Image: img}
 			// append image to index with annotation
 			index = mutate.AppendManifests(index, mutate.IndexAddendum{
-				Add: img,
+				Add: emptyConfigImage,
 				Descriptor: v1.Descriptor{
 					Annotations: map[string]string{
 						tufFileAnnotation: fmt.Sprintf("%s/%s", subdir, name),
@@ -103,7 +105,7 @@ func (m *TufMirror) GetDelegatedTargetMirrors() ([]*MirrorIndex, error) {
 				},
 			})
 		}
-		mirror = append(mirror, &MirrorIndex{Index: index, Tag: role.Name})
+		mirror = append(mirror, &Index{Index: index, Tag: role.Name})
 	}
 	return mirror, nil
 }

mirror/targets_test.go

@@ -1,6 +1,7 @@
 package mirror
 
 import (
+	"context"
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
@@ -8,9 +9,8 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/docker/attest/internal/embed"
 	"github.com/docker/attest/internal/test"
-	"github.com/docker/attest/pkg/tuf"
+	"github.com/docker/attest/tuf"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -23,14 +23,14 @@ type Layers struct {
 }
 
 func TestGetTufTargetsMirror(t *testing.T) {
-	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "..", "test", "testdata", "tuf", "test-repo"))))
+	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "test", "testdata", "tuf", "test-repo"))))
 	defer server.Close()
 
 	path := test.CreateTempDir(t, "", "tuf_temp")
-	m, err := NewTufMirror(embed.DevRoot, path, server.URL+"/metadata", server.URL+"/targets", tuf.NewMockVersionChecker())
+	m, err := NewTUFMirror(context.Background(), tuf.DockerTUFRootDev.Data, path, server.URL+metadataPath, server.URL+targetsPath, tuf.NewMockVersionChecker())
 	assert.NoError(t, err)
 
-	targets, err := m.GetTufTargetMirrors()
+	targets, err := m.GetTUFTargetMirrors()
 	assert.NoError(t, err)
 	assert.Greater(t, len(targets), 0)
 
@@ -50,31 +50,31 @@ func TestGetTufTargetsMirror(t *testing.T) {
 			ann, ok := layer.Annotations[tufFileAnnotation]
 			assert.True(t, ok)
 			parts := strings.Split(ann, ".")
-			// <digest>.filename.json
-			assert.Equal(t, len(parts), 3)
+			// <digest>.filename.<ext|optional>
+			assert.GreaterOrEqual(t, len(parts), 2)
 		}
 	}
 }
 
 func TestTargetDelegationMetadata(t *testing.T) {
-	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "..", "test", "testdata", "tuf", "test-repo"))))
+	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "test", "testdata", "tuf", "test-repo"))))
 	defer server.Close()
 
 	path := test.CreateTempDir(t, "", "tuf_temp")
-	tm, err := NewTufMirror(embed.DevRoot, path, server.URL+"/metadata", server.URL+"/targets", tuf.NewMockVersionChecker())
+	tm, err := NewTUFMirror(context.Background(), tuf.DockerTUFRootDev.Data, path, server.URL+metadataPath, server.URL+targetsPath, tuf.NewMockVersionChecker())
 	assert.NoError(t, err)
 
-	targets, err := tm.TufClient.LoadDelegatedTargets("test-role", "targets")
+	targets, err := tm.TUFClient.LoadDelegatedTargets("test-role", "targets")
 	assert.NoError(t, err)
 	assert.Greater(t, len(targets.Signed.Targets), 0)
 }
 
 func TestGetDelegatedTargetMirrors(t *testing.T) {
-	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "..", "test", "testdata", "tuf", "test-repo"))))
+	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join("..", "test", "testdata", "tuf", "test-repo"))))
 	defer server.Close()
 
 	path := test.CreateTempDir(t, "", "tuf_temp")
-	m, err := NewTufMirror(embed.DevRoot, path, server.URL+"/metadata", server.URL+"/targets", tuf.NewMockVersionChecker())
+	m, err := NewTUFMirror(context.Background(), tuf.DockerTUFRootDev.Data, path, server.URL+metadataPath, server.URL+targetsPath, tuf.NewMockVersionChecker())
 	assert.NoError(t, err)
 
 	mirrors, err := m.GetDelegatedTargetMirrors()
@@ -97,8 +97,8 @@ func TestGetDelegatedTargetMirrors(t *testing.T) {
 			ann, ok := layer.Annotations[tufFileAnnotation]
 			assert.True(t, ok)
 			parts := strings.Split(ann, ".")
-			// <subdir>/<digest>.filename.json
-			assert.Equal(t, len(parts), 3)
+			// <subdir>/<digest>.filename.<ext|optional>
+			assert.GreaterOrEqual(t, len(parts), 2)
 		}
 	}
 }

mirror/types.go

@@ -1,24 +1,25 @@
 package mirror
 
 import (
-	"github.com/docker/attest/pkg/tuf"
+	"github.com/docker/attest/oci"
+	"github.com/docker/attest/tuf"
 	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/theupdateframework/go-tuf/v2/metadata"
 )
 
 const (
-	DefaultMetadataURL   = "https://docker.github.io/tuf-staging/metadata"
-	DefaultTargetsURL    = "https://docker.github.io/tuf-staging/targets"
+	DefaultMetadataURL   = "https://docker.github.io/tuf/metadata"
+	DefaultTargetsURL    = "https://docker.github.io/tuf/targets"
 	tufMetadataMediaType = "application/vnd.tuf.metadata+json"
 	tufTargetMediaType   = "application/vnd.tuf.target"
 	tufFileAnnotation    = "tuf.io/filename"
 )
 
-type TufRole string
+type TUFRole string
 
-var TufRoles = []TufRole{metadata.ROOT, metadata.SNAPSHOT, metadata.TARGETS, metadata.TIMESTAMP}
+var TUFRoles = []TUFRole{metadata.ROOT, metadata.SNAPSHOT, metadata.TARGETS, metadata.TIMESTAMP}
 
-type TufMetadata struct {
+type TUFMetadata struct {
 	Root      map[string][]byte
 	Snapshot  map[string][]byte
 	Targets   map[string][]byte
@@ -31,18 +32,18 @@ type DelegatedTargetMetadata struct {
 	Data    []byte
 }
 
-type MirrorImage struct {
-	Image v1.Image
+type Image struct {
+	Image *oci.EmptyConfigImage
 	Tag   string
 }
 
-type MirrorIndex struct {
+type Index struct {
 	Index v1.ImageIndex
 	Tag   string
 }
 
-type TufMirror struct {
-	TufClient   *tuf.TufClient
+type TUFMirror struct {
+	TUFClient   *tuf.Client
 	tufPath     string
 	metadataURL string
 	targetsURL  string

oci/README.md

@@ -0,0 +1,2 @@
+## oci
+This package is for generic OCI components. For attestation specific components see the `attestation` package.

oci/authn.go

@@ -1,6 +1,8 @@
 package oci
 
 import (
+	"io"
+
 	ecr "github.com/awslabs/amazon-ecr-credential-helper/ecr-login"
 	"github.com/google/go-containerregistry/pkg/authn"
 	"github.com/google/go-containerregistry/pkg/v1/google"
@@ -16,6 +18,6 @@ func MultiKeychainAll() authn.Keychain {
 	return authn.NewMultiKeychain(
 		authn.DefaultKeychain,
 		google.Keychain,
-		authn.NewKeychainFromHelper(ecr.NewECRHelper()),
+		authn.NewKeychainFromHelper(ecr.NewECRHelper(ecr.WithLogger(io.Discard))),
 	)
 }

oci/authn_test.go

@@ -0,0 +1,33 @@
+//go:build e2e
+
+package oci_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/docker/attest/internal/test"
+	"github.com/docker/attest/oci"
+	"github.com/stretchr/testify/require"
+)
+
+func TestRegistryAuth(t *testing.T) {
+	attIdx, err := oci.IndexFromPath(test.UnsignedTestImage(".."))
+	require.NoError(t, err)
+	// test cases for ecr, gcr and dockerhub
+	testCases := []struct {
+		Image string
+	}{
+		{Image: "175142243308.dkr.ecr.us-east-1.amazonaws.com/e2e-test-image:latest"},
+		{Image: "docker/image-signer-verifier-test:latest"},
+	}
+	ctx := context.Background()
+	for _, tc := range testCases {
+		t.Run(tc.Image, func(t *testing.T) {
+			err := oci.PushIndexToRegistry(ctx, attIdx.Index, tc.Image)
+			require.NoError(t, err)
+			_, err = oci.IndexFromRemote(ctx, tc.Image)
+			require.NoError(t, err)
+		})
+	}
+}

oci/oci.go

@@ -2,23 +2,21 @@ package oci
 
 import (
 	"context"
-	"encoding/json"
 	"fmt"
 	"strings"
 
-	"github.com/containerd/containerd/platforms"
+	"github.com/containerd/platforms"
 	"github.com/distribution/reference"
-	att "github.com/docker/attest/pkg/attestation"
+	"github.com/docker/attest/useragent"
 	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/remote"
 	"github.com/in-toto/in-toto-golang/in_toto/slsa_provenance/common"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/package-url/packageurl-go"
-	"github.com/pkg/errors"
 )
 
 // ParsePlatform parses the provided platform string or attempts to obtain
-// the platform of the current host system
+// the platform of the current host system.
 func ParsePlatform(platformStr string) (*v1.Platform, error) {
 	if platformStr == "" {
 		cdp := platforms.Normalize(platforms.DefaultSpec())
@@ -30,14 +28,17 @@ func ParsePlatform(platformStr string) (*v1.Platform, error) {
 			Architecture: cdp.Architecture,
 			Variant:      cdp.Variant,
 		}, nil
-	} else {
-		return v1.ParsePlatform(platformStr)
 	}
+	return v1.ParsePlatform(platformStr)
 }
 
 func WithOptions(ctx context.Context, platform *v1.Platform) []remote.Option {
 	// prepare options
-	options := []remote.Option{MultiKeychainOption(), remote.WithTransport(HttpTransport()), remote.WithContext(ctx)}
+	options := []remote.Option{
+		MultiKeychainOption(),
+		remote.WithContext(ctx),
+		remote.WithUserAgent(useragent.Get(ctx)),
+	}
 
 	// add in platform into remote Get operation; this might conflict with an explicit digest, but we are trying anyway
 	if platform != nil {
@@ -46,61 +47,18 @@ func WithOptions(ctx context.Context, platform *v1.Platform) []remote.Option {
 	return options
 }
 
-func ExtractEnvelopes(ia *AttestationManifest, predicateType string) ([]*att.Envelope, error) {
-	manifest := ia.Manifest
-	image := ia.Image
-	var envs []*att.Envelope
-	layers, err := image.Layers()
-	if err != nil {
-		return nil, fmt.Errorf("failed to get layers: %w", err)
-	}
-	for i, l := range manifest.Layers {
-		if (strings.HasPrefix(string(l.MediaType), "application/vnd.in-toto.")) &&
-			strings.HasSuffix(string(l.MediaType), "+dsse") &&
-			l.Annotations[InTotoPredicateType] == predicateType {
-			reader, err := layers[i].Uncompressed()
-			if err != nil {
-				return nil, fmt.Errorf("failed to get layer contents: %w", err)
-			}
-			defer reader.Close()
-			var env = new(att.Envelope)
-			err = json.NewDecoder(reader).Decode(&env)
-			if err != nil {
-				return nil, fmt.Errorf("failed to decode envelope: %w", err)
-			}
-			envs = append(envs, env)
-		}
-	}
-
-	return envs, nil
-}
-
-func imageDigestForPlatform(ix *v1.IndexManifest, platform *v1.Platform) (string, error) {
-	for _, m := range ix.Manifests {
+func ImageDescriptor(ix *v1.IndexManifest, platform *v1.Platform) (*v1.Descriptor, error) {
+	for i := range ix.Manifests {
+		m := &ix.Manifests[i]
 		if (m.MediaType == ocispec.MediaTypeImageManifest || m.MediaType == "application/vnd.docker.distribution.manifest.v2+json") && m.Platform.Equals(*platform) {
-			return m.Digest.String(), nil
+			return m, nil
 		}
 	}
-	return "", errors.New(fmt.Sprintf("no image found for platform %v", platform))
+	return nil, fmt.Errorf("no image found for platform %v", platform)
 }
 
-func attestationDigestForDigest(ix *v1.IndexManifest, imageDigest string, attestType string) (string, error) {
-	for _, m := range ix.Manifests {
-		if v, ok := m.Annotations[att.DockerReferenceType]; ok && v == attestType {
-			if d, ok := m.Annotations[att.DockerReferenceDigest]; ok && d == imageDigest {
-				return m.Digest.String(), nil
-			}
-		}
-	}
-	return "", errors.New(fmt.Sprintf("no attestation found for image %s", imageDigest))
-}
-
-func RefToPURL(ref string, platform *v1.Platform) (string, bool, error) {
+func RefToPURL(named reference.Named, platform *v1.Platform) (string, bool, error) {
 	var isCanonical bool
-	named, err := reference.ParseNormalizedNamed(ref)
-	if err != nil {
-		return "", false, fmt.Errorf("failed to parse ref %q: %w", ref, err)
-	}
 	var qualifiers []packageurl.Qualifier
 
 	if canonical, ok := named.(reference.Canonical); ok {
@@ -134,7 +92,7 @@ func RefToPURL(ref string, platform *v1.Platform) (string, bool, error) {
 		})
 	}
 
-	p := packageurl.NewPackageURL("docker", ns, name, version, qualifiers, "")
+	p := packageurl.NewPackageURL(packageurl.TypeDocker, ns, name, version, qualifiers, "")
 	return p.ToString(), isCanonical, nil
 }
 
@@ -147,3 +105,50 @@ func SplitDigest(digest string) (common.DigestSet, error) {
 		parts[0]: parts[1],
 	}, nil
 }
+
+func ReplaceTagInSpec(src *ImageSpec, digest v1.Hash) (*ImageSpec, error) {
+	newName, err := ReplaceTag(src.Identifier, digest)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse repo name: %w", err)
+	}
+	return &ImageSpec{
+		Identifier: newName,
+		Type:       src.Type,
+		Platform:   src.Platform,
+	}, nil
+}
+
+// so that the index tag is replaced with a tag unique to the image digest and doesn't overwrite it.
+func ReplaceTag(image string, digest v1.Hash) (string, error) {
+	if strings.HasPrefix(image, LocalPrefix) {
+		return image, nil
+	}
+	notag, err := WithoutTag(image)
+	if err != nil {
+		return "", nil
+	}
+	return fmt.Sprintf("%s:%s-%s.att", notag, digest.Algorithm, digest.Hex), nil
+}
+
+func ReplaceDigestInSpec(src *ImageSpec, digest v1.Hash) (*ImageSpec, error) {
+	newName, err := replaceDigest(src.Identifier, digest)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse repo name: %w", err)
+	}
+	return &ImageSpec{
+		Identifier: newName,
+		Type:       src.Type,
+		Platform:   src.Platform,
+	}, nil
+}
+
+func replaceDigest(image string, digest v1.Hash) (string, error) {
+	if strings.HasPrefix(image, LocalPrefix) {
+		return image, nil
+	}
+	notag, err := WithoutTag(image)
+	if err != nil {
+		return "", nil
+	}
+	return fmt.Sprintf("%s@%s:%s", notag, digest.Algorithm, digest.Hex), nil
+}

oci/oci_test.go

@@ -0,0 +1,146 @@
+package oci_test
+
+import (
+	"testing"
+
+	"github.com/distribution/reference"
+	"github.com/docker/attest/internal/test"
+	"github.com/docker/attest/oci"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/layout"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestRefToPurl(t *testing.T) {
+	arm, err := oci.ParsePlatform("arm64/linux")
+	require.NoError(t, err)
+	ref, err := reference.ParseNormalizedNamed("alpine")
+	require.NoError(t, err)
+	purl, canonical, err := oci.RefToPURL(ref, arm)
+	assert.NoError(t, err)
+	assert.Equal(t, "pkg:docker/alpine@latest?platform=arm64%2Flinux", purl)
+	assert.False(t, canonical)
+	ref, err = reference.ParseNormalizedNamed("alpine:123")
+	require.NoError(t, err)
+	purl, canonical, err = oci.RefToPURL(ref, arm)
+	assert.NoError(t, err)
+	assert.Equal(t, "pkg:docker/alpine@123?platform=arm64%2Flinux", purl)
+	assert.False(t, canonical)
+	ref, err = reference.ParseNormalizedNamed("google/alpine:123")
+	require.NoError(t, err)
+	purl, canonical, err = oci.RefToPURL(ref, arm)
+	assert.NoError(t, err)
+	assert.Equal(t, "pkg:docker/google/alpine@123?platform=arm64%2Flinux", purl)
+	assert.False(t, canonical)
+	ref, err = reference.ParseNormalizedNamed("library/alpine:123")
+	require.NoError(t, err)
+	purl, canonical, err = oci.RefToPURL(ref, arm)
+	assert.NoError(t, err)
+	assert.Equal(t, "pkg:docker/alpine@123?platform=arm64%2Flinux", purl)
+	assert.False(t, canonical)
+	ref, err = reference.ParseNormalizedNamed("docker.io/library/alpine:123")
+	require.NoError(t, err)
+	purl, canonical, err = oci.RefToPURL(ref, arm)
+	assert.NoError(t, err)
+	assert.Equal(t, "pkg:docker/alpine@123?platform=arm64%2Flinux", purl)
+	assert.False(t, canonical)
+	ref, err = reference.ParseNormalizedNamed("localhost:5001/library/alpine:123")
+	require.NoError(t, err)
+	purl, canonical, err = oci.RefToPURL(ref, arm)
+	assert.NoError(t, err)
+	assert.Equal(t, "pkg:docker/localhost%3A5001/library/alpine@123?platform=arm64%2Flinux", purl)
+	assert.False(t, canonical)
+	ref, err = reference.ParseNormalizedNamed("localhost:5001/alpine:123")
+	require.NoError(t, err)
+	purl, canonical, err = oci.RefToPURL(ref, arm)
+	assert.NoError(t, err)
+	assert.Equal(t, "pkg:docker/localhost%3A5001/alpine@123?platform=arm64%2Flinux", purl)
+	assert.False(t, canonical)
+	ref, err = reference.ParseNormalizedNamed("localhost:5001/alpine@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b")
+	require.NoError(t, err)
+	purl, canonical, err = oci.RefToPURL(ref, arm)
+	assert.NoError(t, err)
+	assert.Equal(t, "pkg:docker/localhost%3A5001/alpine?digest=sha256%3Ac5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b&platform=arm64%2Flinux", purl)
+	assert.True(t, canonical)
+}
+
+// Test fix for https://github.com/docker/secure-artifacts-team-issues/issues/202
+func TestImageDigestForPlatform(t *testing.T) {
+	idx, err := layout.ImageIndexFromPath(test.UnsignedTestImage(".."))
+	assert.NoError(t, err)
+
+	idxm, err := idx.IndexManifest()
+	assert.NoError(t, err)
+
+	idxDescriptor := idxm.Manifests[0]
+	idxDigest := idxDescriptor.Digest
+
+	mfs, err := idx.ImageIndex(idxDigest)
+	assert.NoError(t, err)
+	mfs2, err := mfs.IndexManifest()
+	assert.NoError(t, err)
+
+	p, err := oci.ParsePlatform("linux/amd64")
+	assert.NoError(t, err)
+	desc, err := oci.ImageDescriptor(mfs2, p)
+	assert.NoError(t, err)
+	digest := desc.Digest.String()
+	assert.Equal(t, "sha256:da8b190665956ea07890a0273e2a9c96bfe291662f08e2860e868eef69c34620", digest)
+
+	p, err = oci.ParsePlatform("linux/arm64")
+	assert.NoError(t, err)
+	desc, err = oci.ImageDescriptor(mfs2, p)
+	assert.NoError(t, err)
+	digest = desc.Digest.String()
+	assert.Equal(t, "sha256:7a76cec943853f9f7105b1976afa1bf7cd5bb6afc4e9d5852dd8da7cf81ae86e", digest)
+}
+
+func TestWithoutTag(t *testing.T) {
+	tc := []struct {
+		name     string
+		expected string
+	}{
+		{name: "image:tag", expected: "index.docker.io/library/image"},
+		{name: "image", expected: "index.docker.io/library/image"},
+		{name: "image:sha256-digest.att", expected: "index.docker.io/library/image"},
+		{name: oci.RegistryPrefix + "image:tag", expected: oci.RegistryPrefix + "index.docker.io/library/image"},
+		{name: "image@sha256:166710df254975d4a6c4c407c315951c22753dcaa829e020a3fd5d18fff70dd2", expected: "index.docker.io/library/image"},
+		{name: oci.RegistryPrefix + "image@sha256:166710df254975d4a6c4c407c315951c22753dcaa829e020a3fd5d18fff70dd2", expected: oci.RegistryPrefix + "index.docker.io/library/image"},
+		{name: oci.RegistryPrefix + "127.0.0.1:36555/repo:latest", expected: oci.RegistryPrefix + "127.0.0.1:36555/repo"},
+	}
+	for _, c := range tc {
+		t.Run(c.name, func(t *testing.T) {
+			notag, _ := oci.WithoutTag(c.name)
+			assert.Equal(t, c.expected, notag)
+		})
+	}
+}
+
+func TestReplaceTag(t *testing.T) {
+	tc := []struct {
+		name     string
+		expected string
+	}{
+		{name: "image:tag", expected: "index.docker.io/library/image:sha256-digest.att"},
+		{name: "image", expected: "index.docker.io/library/image:sha256-digest.att"},
+		{name: "image:sha256-digest.att", expected: "index.docker.io/library/image:sha256-digest.att"},
+		{name: oci.RegistryPrefix + "image:tag", expected: oci.RegistryPrefix + "index.docker.io/library/image:sha256-digest.att"},
+		{name: "image@sha256:166710df254975d4a6c4c407c315951c22753dcaa829e020a3fd5d18fff70dd2", expected: "index.docker.io/library/image:sha256-digest.att"},
+		{name: oci.LocalPrefix + "foobar", expected: oci.LocalPrefix + "foobar"},
+		{name: oci.RegistryPrefix + "image@sha256:166710df254975d4a6c4c407c315951c22753dcaa829e020a3fd5d18fff70dd2", expected: oci.RegistryPrefix + "index.docker.io/library/image:sha256-digest.att"},
+		{name: oci.RegistryPrefix + "127.0.0.1:36555/repo:latest", expected: oci.RegistryPrefix + "127.0.0.1:36555/repo:sha256-digest.att"},
+	}
+
+	digest := v1.Hash{
+		Algorithm: "sha256",
+		Hex:       "digest",
+	}
+	for _, c := range tc {
+		t.Run(c.name, func(t *testing.T) {
+			replaced, err := oci.ReplaceTag(c.name, digest)
+			require.NoError(t, err)
+			assert.Equal(t, c.expected, replaced)
+		})
+	}
+}

oci/output.go

@@ -0,0 +1,145 @@
+package oci
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"github.com/google/go-containerregistry/pkg/name"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/empty"
+	"github.com/google/go-containerregistry/pkg/v1/layout"
+	"github.com/google/go-containerregistry/pkg/v1/mutate"
+	"github.com/google/go-containerregistry/pkg/v1/remote"
+)
+
+// PushImageToRegistry pushes an image to the registry with the specified name.
+func PushImageToRegistry(ctx context.Context, image v1.Image, imageName string) error {
+	ref, err := name.ParseReference(imageName)
+	if err != nil {
+		return fmt.Errorf("Failed to parse image name '%s': %w", imageName, err)
+	}
+
+	// Push the image to the registry
+	return remote.Write(ref, image, WithOptions(ctx, nil)...)
+}
+
+// PushIndexToRegistry pushes an index to the registry with the specified name.
+func PushIndexToRegistry(ctx context.Context, index v1.ImageIndex, imageName string) error {
+	// Parse the index name
+	ref, err := name.ParseReference(imageName)
+	if err != nil {
+		return fmt.Errorf("Failed to parse image name: %w", err)
+	}
+
+	// Push the index to the registry
+	return remote.WriteIndex(ref, index, WithOptions(ctx, nil)...)
+}
+
+// SaveIndexAsOCILayout saves an image as an OCI layout to the specified path.
+func SaveImageAsOCILayout(image v1.Image, path string) error {
+	// Save the image to the local filesystem
+	err := os.MkdirAll(path, os.ModePerm)
+	if err != nil {
+		return fmt.Errorf("failed to create directory: %w", err)
+	}
+	index := empty.Index
+	l, err := layout.Write(path, index)
+	if err != nil {
+		return fmt.Errorf("failed to create index: %w", err)
+	}
+	return l.AppendImage(image)
+}
+
+// SaveIndexAsOCILayout saves an index as an OCI layout to the specified path.
+func SaveIndexAsOCILayout(image v1.ImageIndex, path string) error {
+	// Save the index to the local filesystem
+	err := os.MkdirAll(path, os.ModePerm)
+	if err != nil {
+		return fmt.Errorf("failed to create directory: %w", err)
+	}
+
+	_, err = layout.Write(path, image)
+	if err != nil {
+		return fmt.Errorf("failed to create index: %w", err)
+	}
+	return nil
+}
+
+// SaveIndex saves an index to the specified outputs.
+func SaveIndex(ctx context.Context, outputs []*ImageSpec, index v1.ImageIndex, indexName string) error {
+	// split output by comma and write or push each one
+	for _, output := range outputs {
+		if output.Type == OCI {
+			idx := v1.ImageIndex(empty.Index)
+			idx = mutate.AppendManifests(idx, mutate.IndexAddendum{
+				Add: index,
+				Descriptor: v1.Descriptor{
+					Annotations: map[string]string{
+						OCIReferenceTarget: indexName,
+					},
+				},
+			})
+			err := SaveIndexAsOCILayout(idx, output.Identifier)
+			if err != nil {
+				return fmt.Errorf("failed to write signed image: %w", err)
+			}
+		} else {
+			err := PushIndexToRegistry(ctx, index, output.Identifier)
+			if err != nil {
+				return fmt.Errorf("failed to push signed image: %w", err)
+			}
+		}
+	}
+	return nil
+}
+
+// SaveImage saves an image to the specified output.
+func SaveImage(ctx context.Context, output *ImageSpec, image v1.Image, imageName string) error {
+	if output.Type == OCI {
+		idx := v1.ImageIndex(empty.Index)
+		idx = mutate.AppendManifests(idx, mutate.IndexAddendum{
+			Add: image,
+			Descriptor: v1.Descriptor{
+				Annotations: map[string]string{
+					OCIReferenceTarget: imageName,
+				},
+			},
+		})
+		err := SaveIndexAsOCILayout(idx, output.Identifier)
+		if err != nil {
+			return fmt.Errorf("failed to write signed image: %w", err)
+		}
+	} else {
+		err := PushImageToRegistry(ctx, image, output.Identifier)
+		if err != nil {
+			return fmt.Errorf("failed to push signed image: %w", err)
+		}
+	}
+	return nil
+}
+
+// SaveImagesNoTag saves a list of images by digest to the specified outputs.
+func SaveImagesNoTag(ctx context.Context, images []v1.Image, outputs []*ImageSpec) error {
+	for _, output := range outputs {
+		// OCI layout output not supported
+		if output.Type == OCI {
+			continue
+		}
+		for _, image := range images {
+			digest, err := image.Digest()
+			if err != nil {
+				return fmt.Errorf("failed to get image digest: %w", err)
+			}
+			spec, err := ReplaceDigestInSpec(output, digest)
+			if err != nil {
+				return fmt.Errorf("failed to create image spec: %w", err)
+			}
+			err = PushImageToRegistry(ctx, image, spec.Identifier)
+			if err != nil {
+				return fmt.Errorf("failed to push image: %w", err)
+			}
+		}
+	}
+	return nil
+}

oci/output_test.go

@@ -0,0 +1,111 @@
+package oci_test
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+	"testing"
+
+	"github.com/docker/attest/attestation"
+	"github.com/docker/attest/internal/test"
+	"github.com/docker/attest/oci"
+	"github.com/google/go-containerregistry/pkg/registry"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/empty"
+	intoto "github.com/in-toto/in-toto-golang/in_toto"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSavingIndex(t *testing.T) {
+	outputLayout := test.CreateTempDir(t, "", "mirror-test")
+	attIdx, err := oci.IndexFromPath(test.UnsignedTestImage(".."))
+	require.NoError(t, err)
+
+	ctx := context.Background()
+	regServer := test.NewLocalRegistry(ctx)
+	defer regServer.Close()
+
+	u, err := url.Parse(regServer.URL)
+	require.NoError(t, err)
+
+	indexName := fmt.Sprintf("%s/repo:root", u.Host)
+	output, err := oci.ParseImageSpecs(indexName)
+	require.NoError(t, err)
+	err = oci.SaveIndex(ctx, output, attIdx.Index, indexName)
+	require.NoError(t, err)
+
+	ociOutput, err := oci.ParseImageSpecs(oci.LocalPrefix + outputLayout)
+	require.NoError(t, err)
+	err = oci.SaveIndex(ctx, ociOutput, attIdx.Index, indexName)
+	require.NoError(t, err)
+}
+
+func TestSavingImage(t *testing.T) {
+	outputLayout := test.CreateTempDir(t, "", "mirror-test")
+
+	img := empty.Image
+
+	ctx := context.Background()
+	regServer := test.NewLocalRegistry(ctx)
+	defer regServer.Close()
+
+	u, err := url.Parse(regServer.URL)
+	require.NoError(t, err)
+
+	indexName := fmt.Sprintf("%s/repo:root", u.Host)
+	output, err := oci.ParseImageSpec(indexName)
+	require.NoError(t, err)
+	err = oci.SaveImage(ctx, output, img, indexName)
+	require.NoError(t, err)
+
+	ociOutput, err := oci.ParseImageSpec(oci.LocalPrefix + outputLayout)
+	require.NoError(t, err)
+	err = oci.SaveImage(ctx, ociOutput, img, indexName)
+	require.NoError(t, err)
+}
+
+func TestSavingReferrers(t *testing.T) {
+	ctx, signer := test.Setup(t)
+	opts := &attestation.SigningOptions{}
+	statement := &intoto.Statement{
+		StatementHeader: intoto.StatementHeader{
+			PredicateType: attestation.VSAPredicateType,
+		},
+	}
+
+	digest, err := v1.NewHash("sha256:da8b190665956ea07890a0273e2a9c96bfe291662f08e2860e868eef69c34620")
+	require.NoError(t, err)
+	subject := &v1.Descriptor{
+		MediaType: "application/vnd.oci.image.manifest.v1+json",
+		Digest:    digest,
+	}
+	manifest, err := attestation.NewManifest(subject)
+	require.NoError(t, err)
+	err = manifest.Add(ctx, signer, statement, opts)
+	require.NoError(t, err)
+	regServer := test.NewLocalRegistry(ctx, registry.WithReferrersSupport(true))
+	defer regServer.Close()
+
+	u, err := url.Parse(regServer.URL)
+	require.NoError(t, err)
+
+	indexName := fmt.Sprintf("%s/repo:root", u.Host)
+	output, err := oci.ParseImageSpecs(indexName)
+	require.NoError(t, err)
+	artifacts, err := manifest.BuildReferringArtifacts()
+	require.NoError(t, err)
+	err = oci.SaveImagesNoTag(ctx, artifacts, output)
+	require.NoError(t, err)
+
+	reg := &attestation.MockRegistryResolver{
+		Subject:      subject,
+		MockResolver: &attestation.MockResolver{},
+		ImageNameStr: indexName,
+	}
+	require.NoError(t, err)
+	refResolver, err := attestation.NewReferrersResolver(reg)
+	require.NoError(t, err)
+	attestations, err := refResolver.Attestations(ctx, attestation.VSAPredicateType)
+	require.NoError(t, err)
+	require.Len(t, attestations, 1)
+}

oci/registry.go

@@ -0,0 +1,64 @@
+package oci
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/google/go-containerregistry/pkg/name"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/remote"
+)
+
+// ensure RegistryImageDetailsResolver implements ImageDetailsResolver.
+var _ ImageDetailsResolver = &RegistryImageDetailsResolver{}
+
+type RegistryImageDetailsResolver struct {
+	*ImageSpec
+	descriptor *v1.Descriptor
+}
+
+func NewRegistryImageDetailsResolver(src *ImageSpec) (*RegistryImageDetailsResolver, error) {
+	return &RegistryImageDetailsResolver{
+		ImageSpec: src,
+	}, nil
+}
+
+func (r *RegistryImageDetailsResolver) ImageName(_ context.Context) (string, error) {
+	return r.Identifier, nil
+}
+
+func (r *RegistryImageDetailsResolver) ImagePlatform(_ context.Context) (*v1.Platform, error) {
+	return r.Platform, nil
+}
+
+func (r *RegistryImageDetailsResolver) ImageDescriptor(ctx context.Context) (*v1.Descriptor, error) {
+	if r.descriptor == nil {
+		subjectRef, err := name.ParseReference(r.Identifier)
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse reference: %w", err)
+		}
+		options := WithOptions(ctx, r.Platform)
+		image, err := remote.Image(subjectRef, options...)
+		if err != nil {
+			return nil, fmt.Errorf("failed to get image manifest: %w", err)
+		}
+		digest, err := image.Digest()
+		if err != nil {
+			return nil, fmt.Errorf("failed to get image digest: %w", err)
+		}
+		size, err := image.Size()
+		if err != nil {
+			return nil, fmt.Errorf("failed to get image size: %w", err)
+		}
+		mediaType, err := image.MediaType()
+		if err != nil {
+			return nil, fmt.Errorf("failed to get image media type: %w", err)
+		}
+		r.descriptor = &v1.Descriptor{
+			Digest:    digest,
+			Size:      size,
+			MediaType: mediaType,
+		}
+	}
+	return r.descriptor, nil
+}

oci/resolver.go

@@ -0,0 +1,13 @@
+package oci
+
+import (
+	"context"
+
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+)
+
+type ImageDetailsResolver interface {
+	ImageName(ctx context.Context) (string, error)
+	ImagePlatform(ctx context.Context) (*v1.Platform, error)
+	ImageDescriptor(ctx context.Context) (*v1.Descriptor, error)
+}

oci/types.go

@@ -1,6 +1,9 @@
 package oci
 
 import (
+	"bytes"
+	"context"
+	"encoding/json"
 	"fmt"
 	"strings"
 
@@ -11,26 +14,20 @@ import (
 )
 
 const (
-	AttestationManifestType            = "attestation-manifest"
-	InTotoPredicateType                = "in-toto.io/predicate-type"
-	OciReferenceTarget                 = "org.opencontainers.image.ref.name"
-	LocalPrefix                        = "oci://"
-	RegistryPrefix                     = "docker://"
-	OCI                     SourceType = "OCI"
-	Docker                  SourceType = "Docker"
+	OCIReferenceTarget            = "org.opencontainers.image.ref.name"
+	LocalPrefix                   = "oci://"
+	RegistryPrefix                = "docker://"
+	OCI                SourceType = "OCI"
+	Docker             SourceType = "Docker"
 )
 
-type SourceType string
-type SubjectIndex struct {
-	Index v1.ImageIndex
-	Name  string
-}
-
-type AttestationOptions struct {
-	NoReferrers   bool
-	Attach        bool
-	ReferrersRepo string
-}
+type (
+	SourceType string
+	NamedIndex struct {
+		Index v1.ImageIndex
+		Name  string
+	}
+)
 
 type ImageSpecOption func(*ImageSpec) error
 
@@ -42,7 +39,7 @@ type ImageSpec struct {
 	Platform   *v1.Platform
 }
 
-func SubjectIndexFromPath(path string) (*SubjectIndex, error) {
+func IndexFromPath(path string) (*NamedIndex, error) {
 	wrapperIdx, err := layout.ImageIndexFromPath(path)
 	if err != nil {
 		return nil, fmt.Errorf("failed to load image index: %w", err)
@@ -52,42 +49,41 @@ func SubjectIndexFromPath(path string) (*SubjectIndex, error) {
 	if err != nil {
 		return nil, fmt.Errorf("failed to get digest: %w", err)
 	}
-	imageName := idxm.Manifests[0].Annotations[OciReferenceTarget]
+	imageName := idxm.Manifests[0].Annotations[OCIReferenceTarget]
 	idxDigest := idxm.Manifests[0].Digest
 
 	idx, err := wrapperIdx.ImageIndex(idxDigest)
 	if err != nil {
 		return nil, fmt.Errorf("failed to extract ImageIndex for digest %s: %w", idxDigest.String(), err)
 	}
-	return &SubjectIndex{
+	return &NamedIndex{
 		Index: idx,
 		Name:  imageName,
 	}, nil
 }
 
-func SubjectIndexFromRemote(image string) (*SubjectIndex, error) {
+func IndexFromRemote(ctx context.Context, image string) (*NamedIndex, error) {
 	ref, err := name.ParseReference(image)
 	if err != nil {
 		return nil, fmt.Errorf("failed to parse image reference %s: %w", image, err)
 	}
 
 	// Pull the image from the registry
-	idx, err := remote.Index(ref, MultiKeychainOption())
+	idx, err := remote.Index(ref, WithOptions(ctx, nil)...)
 	if err != nil {
 		return nil, fmt.Errorf("failed to pull image %s: %w", image, err)
 	}
-	return &SubjectIndex{
+	return &NamedIndex{
 		Index: idx,
 		Name:  image,
 	}, nil
 }
 
-func LoadSubjectIndex(input *ImageSpec) (*SubjectIndex, error) {
+func LoadIndex(ctx context.Context, input *ImageSpec) (*NamedIndex, error) {
 	if input.Type == OCI {
-		return SubjectIndexFromPath(input.Identifier)
-	} else {
-		return SubjectIndexFromRemote(input.Identifier)
+		return IndexFromPath(input.Identifier)
 	}
+	return IndexFromRemote(ctx, input.Identifier)
 }
 
 func (i *ImageSpec) ForPlatforms(platform string) ([]*ImageSpec, error) {
@@ -181,3 +177,42 @@ func WithoutTag(image string) (string, error) {
 	repo := ref.Context().Name()
 	return prefix + repo, nil
 }
+
+type EmptyConfigImage struct {
+	v1.Image
+}
+
+func (i *EmptyConfigImage) RawConfigFile() ([]byte, error) {
+	return []byte("{}"), nil
+}
+
+func (i *EmptyConfigImage) Manifest() (*v1.Manifest, error) {
+	mf, err := i.Image.Manifest()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get manifest: %w", err)
+	}
+	mf.Config = v1.Descriptor{
+		MediaType: "application/vnd.oci.empty.v1+json",
+		Size:      2,
+		Digest:    v1.Hash{Algorithm: "sha256", Hex: "44136fa355b3678a1146ad16f7e8649e94fb4fc21fe77e8310c060f61caaff8a"},
+		Data:      []byte("{}"),
+	}
+	return mf, nil
+}
+
+func (i *EmptyConfigImage) RawManifest() ([]byte, error) {
+	mf, err := i.Manifest()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get manifest: %w", err)
+	}
+	return json.Marshal(mf)
+}
+
+func (i *EmptyConfigImage) Digest() (v1.Hash, error) {
+	mb, err := i.RawManifest()
+	if err != nil {
+		return v1.Hash{}, err
+	}
+	digest, _, err := v1.SHA256(bytes.NewReader(mb))
+	return digest, err
+}

oci/types_test.go

@@ -0,0 +1,21 @@
+package oci
+
+import (
+	"testing"
+
+	"github.com/docker/attest/internal/util"
+	"github.com/google/go-containerregistry/pkg/v1/empty"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestEmptyConfigImageDigest(t *testing.T) {
+	empty := empty.Image
+	img := EmptyConfigImage{Image: empty}
+	mf, err := img.RawManifest()
+	require.NoError(t, err)
+	hash := util.SHA256Hex(mf)
+	digest, err := img.Digest()
+	require.NoError(t, err)
+	assert.Equal(t, digest.Hex, hash)
+}

pkg/attest/example_verify_test.go

@@ -1,68 +0,0 @@
-package attest_test
-
-import (
-	"context"
-	"fmt"
-	"os"
-	"path/filepath"
-
-	"github.com/docker/attest/internal/embed"
-	"github.com/docker/attest/pkg/attest"
-	"github.com/docker/attest/pkg/oci"
-	"github.com/docker/attest/pkg/policy"
-	"github.com/docker/attest/pkg/tuf"
-)
-
-func createTufClient(outputPath string) (*tuf.TufClient, error) {
-	// using oci tuf metadata and targets
-	metadataURI := "registry-1.docker.io/docker/tuf-metadata:latest"
-	targetsURI := "registry-1.docker.io/docker/tuf-targets"
-	// example using http tuf metadata and targets
-	// metadataURI := "https://docker.github.io/tuf-staging/metadata"
-	// targetsURI := "https://docker.github.io/tuf-staging/targets"
-
-	return tuf.NewTufClient(embed.StagingRoot, outputPath, metadataURI, targetsURI, tuf.NewMockVersionChecker())
-}
-
-func ExampleVerify_remote() {
-	// create a tuf client
-	home, err := os.UserHomeDir()
-	if err != nil {
-		panic(err)
-	}
-	tufOutputPath := filepath.Join(home, ".docker", "tuf")
-	tufClient, err := createTufClient(tufOutputPath)
-	if err != nil {
-		panic(err)
-	}
-
-	// create a resolver for remote attestations
-	image := "registry-1.docker.io/library/notary:server"
-	platform := "linux/amd64"
-
-	// configure policy options
-	opts := &policy.PolicyOptions{
-		TufClient:       tufClient,
-		LocalTargetsDir: filepath.Join(home, ".docker", "policy"), // location to store policy files downloaded from TUF
-		LocalPolicyDir:  "",                                       // overrides TUF policy for local policy files if set
-		PolicyId:        "",                                       // set to ignore policy mapping and select a policy by id
-	}
-
-	// verify attestations
-	src, err := oci.ParseImageSpec(image, oci.WithPlatform(platform))
-	if err != nil {
-		panic(err)
-	}
-	result, err := attest.Verify(context.Background(), src, opts)
-	if err != nil {
-		panic(err)
-	}
-	switch result.Outcome {
-	case attest.OutcomeSuccess:
-		fmt.Println("policy passed")
-	case attest.OutcomeNoPolicy:
-		fmt.Println("no policy for image")
-	case attest.OutcomeFailure:
-		fmt.Println("policy failed")
-	}
-}

pkg/attest/sign.go

@@ -1,247 +0,0 @@
-package attest
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-
-	"github.com/docker/attest/pkg/attestation"
-	"github.com/docker/attest/pkg/oci"
-	v1 "github.com/google/go-containerregistry/pkg/v1"
-	"github.com/google/go-containerregistry/pkg/v1/empty"
-	"github.com/google/go-containerregistry/pkg/v1/match"
-	"github.com/google/go-containerregistry/pkg/v1/mutate"
-	"github.com/google/go-containerregistry/pkg/v1/partial"
-	"github.com/google/go-containerregistry/pkg/v1/static"
-	"github.com/google/go-containerregistry/pkg/v1/types"
-	intoto "github.com/in-toto/in-toto-golang/in_toto"
-	"github.com/secure-systems-lab/go-securesystemslib/dsse"
-)
-
-func Sign(ctx context.Context, idx v1.ImageIndex, signer dsse.SignerVerifier, opts *attestation.SigningOptions) (v1.ImageIndex, error) {
-	images, err := SignedAttestationImages(ctx, idx, signer, opts)
-	if err != nil {
-		return nil, fmt.Errorf("failed to sign attestation images: %w", err)
-	}
-	for _, image := range images {
-		idx, err = addImageToIndex(idx, image.Image, image.Descriptor, image.AttestationManifest)
-		if err != nil {
-			return nil, fmt.Errorf("failed to add signed layers to index: %w", err)
-		}
-	}
-	return idx, nil
-}
-
-func SignedAttestationImages(ctx context.Context, idx v1.ImageIndex, signer dsse.SignerVerifier, opts *attestation.SigningOptions) ([]*attestation.SignedAttestationImage, error) {
-	// extract attestation manifests from index
-	attestationManifests, err := attestation.GetAttestationManifestsFromIndex(idx)
-	if err != nil {
-		return nil, fmt.Errorf("failed to get attestation manifests: %w", err)
-	}
-	if len(attestationManifests) == 0 {
-		return nil, fmt.Errorf("no attestation manifests found")
-	}
-	images := []*attestation.SignedAttestationImage{}
-	// sign every attestation layer in each manifest
-	for _, manifest := range attestationManifests {
-		newImg, newDescriptor, err := SignLayersAndAddToImage(ctx, manifest.Attestation.Layers, manifest, signer, opts)
-		if err != nil {
-			return nil, fmt.Errorf("failed to add signed layers to image: %w", err)
-		}
-		images = append(images, &attestation.SignedAttestationImage{
-			Image:               newImg,
-			Descriptor:          newDescriptor,
-			AttestationManifest: manifest,
-		})
-	}
-	return images, nil
-}
-
-func AddAttestation(ctx context.Context, idx v1.ImageIndex, statement *intoto.Statement, signer dsse.SignerVerifier) (v1.ImageIndex, error) {
-	if len(statement.Subject) == 0 {
-		return nil, fmt.Errorf("statement has no subjects")
-	}
-
-	subjectDigests := make(map[string]bool)
-	for _, subject := range statement.Subject {
-		subjectDigest := fmt.Sprintf("sha256:%s", subject.Digest["sha256"])
-		subjectDigests[subjectDigest] = true
-	}
-
-	attestationManifests, err := attestation.GetAttestationManifestsFromIndex(idx)
-	if err != nil {
-		return nil, fmt.Errorf("failed to get attestation manifests: %w", err)
-	}
-	updatedIndex := false
-	for _, manifest := range attestationManifests {
-		if subjectDigests[manifest.Annotations[attestation.DockerReferenceDigest]] {
-			attestationLayers := []attestation.AttestationLayer{
-				{
-					Statement: statement,
-					MediaType: types.MediaType(intoto.PayloadType),
-					Annotations: map[string]string{
-						oci.InTotoPredicateType: statement.PredicateType,
-					},
-				},
-			}
-			// hard-coding replace to false here, because if it's true we will remove any unsigned statements, even unrelated ones
-			newImg, newDec, err := SignLayersAndAddToImage(ctx, attestationLayers, manifest, signer, &attestation.SigningOptions{Replace: false})
-			if err != nil {
-				return nil, fmt.Errorf("failed to add signed layers to image: %w", err)
-			}
-			idx, err = addImageToIndex(idx, newImg, newDec, manifest)
-			if err != nil {
-				return nil, fmt.Errorf("failed to add attestation image to index: %w", err)
-			}
-			updatedIndex = true
-		}
-	}
-	if !updatedIndex {
-		return nil, fmt.Errorf("no attestation manifest found for statement")
-	}
-	return idx, nil
-}
-
-func SignLayersAndAddToImage(
-	ctx context.Context,
-	attestationLayers []attestation.AttestationLayer,
-	manifest attestation.AttestationManifest,
-	signer dsse.SignerVerifier,
-	opts *attestation.SigningOptions) (v1.Image, *v1.Descriptor, error) {
-
-	signedLayers, err := signLayers(ctx, attestationLayers, signer, opts)
-	if err != nil {
-		return nil, nil, fmt.Errorf("failed to sign attestations: %w", err)
-	}
-
-	newImg, err := addSignedLayers(signedLayers, manifest, opts)
-	if err != nil {
-		return nil, nil, fmt.Errorf("failed to add signed layers: %w", err)
-	}
-	if !opts.SkipSubject {
-		newImg = mutate.Subject(newImg, *manifest.SubjectDescriptor).(v1.Image)
-	}
-	newDesc, err := partial.Descriptor(newImg)
-	if err != nil {
-		return nil, nil, fmt.Errorf("failed to get descriptor: %w", err)
-	}
-	cf, err := manifest.Attestation.Image.ConfigFile()
-	if err != nil {
-		return nil, nil, fmt.Errorf("failed to get config file: %w", err)
-	}
-	newDesc.Platform = cf.Platform()
-	if newDesc.Platform == nil {
-		newDesc.Platform = &v1.Platform{
-			Architecture: "unknown",
-			OS:           "unknown",
-		}
-	}
-	newDesc.MediaType = manifest.MediaType
-	newDesc.Annotations = manifest.Annotations
-
-	return newImg, newDesc, nil
-}
-
-func addImageToIndex(
-	idx v1.ImageIndex,
-	img v1.Image,
-	desc *v1.Descriptor,
-	manifest attestation.AttestationManifest,
-) (v1.ImageIndex, error) {
-
-	idx = mutate.RemoveManifests(idx, match.Digests(manifest.Digest))
-	idx = mutate.AppendManifests(idx, mutate.IndexAddendum{
-		Add:        img,
-		Descriptor: *desc,
-	})
-	return idx, nil
-}
-
-// signLayers signs each intoto attestation layer with the given signer
-func signLayers(ctx context.Context, layers []attestation.AttestationLayer, signer dsse.SignerVerifier, opts *attestation.SigningOptions) ([]mutate.Addendum, error) {
-	var signedLayers []mutate.Addendum
-	for _, layer := range layers {
-		// only sign intoto layers
-		if layer.MediaType != types.MediaType(intoto.PayloadType) {
-			continue
-		}
-		// mark attestation as experimental
-		layer.Annotations[InTotoReferenceLifecycleStage] = LifecycleStageExperimental
-
-		// sign the statement
-		env, err := signInTotoStatement(ctx, layer.Statement, signer, opts)
-		if err != nil {
-			return nil, fmt.Errorf("failed to sign statement: %w", err)
-		}
-
-		mediaType, err := attestation.DSSEMediaType(layer.Statement.PredicateType)
-		if err != nil {
-			return nil, fmt.Errorf("failed to get DSSE media type: %w", err)
-		}
-		data, err := json.Marshal(env)
-		if err != nil {
-			return nil, fmt.Errorf("failed to marshal envelope: %w", err)
-		}
-		newLayer := static.NewLayer(data, types.MediaType(mediaType))
-		withAnnotations := mutate.Addendum{
-			Layer:       newLayer,
-			Annotations: layer.Annotations,
-		}
-		signedLayers = append(signedLayers, withAnnotations)
-	}
-	return signedLayers, nil
-}
-
-func signInTotoStatement(ctx context.Context, statement *intoto.Statement, signer dsse.SignerVerifier, opts *attestation.SigningOptions) (*attestation.Envelope, error) {
-	payload, err := json.Marshal(statement)
-	if err != nil {
-		return nil, fmt.Errorf("failed to marshal statement: %w", err)
-	}
-	env, err := attestation.SignDSSE(ctx, payload, signer, opts)
-	if err != nil {
-		return nil, fmt.Errorf("failed to sign statement: %w", err)
-	}
-	return env, nil
-}
-
-// addSignedLayers adds signed layers to a new or existing attestation image
-func addSignedLayers(signedLayers []mutate.Addendum, manifest attestation.AttestationManifest, opts *attestation.SigningOptions) (v1.Image, error) {
-	withAnnotations := func(img v1.Image) v1.Image {
-		// this is handy when dealing with referrers
-		return mutate.Annotations(img, map[string]string{
-			attestation.DockerReferenceType:   attestation.AttestationManifestType,
-			attestation.DockerReferenceDigest: manifest.SubjectDescriptor.Digest.String(),
-		}).(v1.Image)
-	}
-	var err error
-	if opts.Replace {
-		// create a new attestation image with only signed layers
-		newImg := empty.Image
-		newImg = mutate.MediaType(newImg, manifest.MediaType)
-		newImg = mutate.ConfigMediaType(newImg, "application/vnd.oci.image.config.v1+json")
-		for _, layer := range signedLayers {
-			newImg, err = mutate.Append(newImg, layer)
-			if err != nil {
-				return nil, fmt.Errorf("failed to append signed layer: %w", err)
-			}
-		}
-		// add any existing unsigned (non-intoto) layers to the new image
-		for _, layer := range manifest.Attestation.Layers {
-			if layer.MediaType != types.MediaType(intoto.PayloadType) {
-				newImg, err = mutate.AppendLayers(newImg, layer.Layer)
-				if err != nil {
-					return nil, fmt.Errorf("failed to append unsigned layer: %w", err)
-				}
-			}
-		}
-		return withAnnotations(newImg), nil
-	}
-	// Add signed layers to the existing image
-	for _, layer := range signedLayers {
-		manifest.Attestation.Image, err = mutate.Append(manifest.Attestation.Image, layer)
-		if err != nil {
-			return nil, fmt.Errorf("failed to append layer: %w", err)
-		}
-	}
-	return withAnnotations(manifest.Attestation.Image), nil
-}

pkg/attest/sign_test.go

@@ -1,221 +0,0 @@
-package attest
-
-import (
-	"encoding/json"
-	"fmt"
-	"path/filepath"
-	"testing"
-
-	"github.com/docker/attest/internal/test"
-	"github.com/docker/attest/pkg/attestation"
-	"github.com/docker/attest/pkg/oci"
-	"github.com/docker/attest/pkg/policy"
-	v1 "github.com/google/go-containerregistry/pkg/v1"
-	"github.com/google/go-containerregistry/pkg/v1/empty"
-	"github.com/google/go-containerregistry/pkg/v1/layout"
-	"github.com/google/go-containerregistry/pkg/v1/mutate"
-	"github.com/google/go-containerregistry/pkg/v1/static"
-	"github.com/google/go-containerregistry/pkg/v1/types"
-	intoto "github.com/in-toto/in-toto-golang/in_toto"
-	v02 "github.com/in-toto/in-toto-golang/in_toto/slsa_provenance/v0.2"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-var (
-	UnsignedTestImage = filepath.Join("..", "..", "test", "testdata", "unsigned-test-image")
-	NoProvenanceImage = filepath.Join("..", "..", "test", "testdata", "no-provenance-image")
-	PassPolicyDir     = filepath.Join("..", "..", "test", "testdata", "local-policy-pass")
-	PassNoTLPolicyDir = filepath.Join("..", "..", "test", "testdata", "local-policy-no-tl")
-	FailPolicyDir     = filepath.Join("..", "..", "test", "testdata", "local-policy-fail")
-	TestTempDir       = "attest-sign-test"
-)
-
-func TestSignVerifyOCILayout(t *testing.T) {
-	ctx, signer := test.Setup(t)
-
-	testCases := []struct {
-		name                 string
-		TestImage            string
-		expectedStatements   int
-		expectedAttestations int
-		replace              bool
-	}{
-
-		{"signed replaced", UnsignedTestImage, 0, 4, true},
-		{"without replace", UnsignedTestImage, 4, 4, false},
-		// image without provenance doesn't fail
-		{"no provenance (replace)", NoProvenanceImage, 0, 2, true},
-		{"no provenance (no replace)", NoProvenanceImage, 2, 2, false},
-	}
-	policyOpts := &policy.PolicyOptions{
-		LocalPolicyDir: PassPolicyDir,
-	}
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-			outputLayout := test.CreateTempDir(t, "", TestTempDir)
-			opts := &attestation.SigningOptions{
-				Replace: tc.replace,
-			}
-			attIdx, err := oci.SubjectIndexFromPath(tc.TestImage)
-			require.NoError(t, err)
-			signedIndex, err := Sign(ctx, attIdx.Index, signer, opts)
-			require.NoError(t, err)
-
-			// output signed attestations
-			idx := v1.ImageIndex(empty.Index)
-			idx = mutate.AppendManifests(idx, mutate.IndexAddendum{
-				Add: signedIndex,
-				Descriptor: v1.Descriptor{
-					Annotations: map[string]string{
-						oci.OciReferenceTarget: attIdx.Name,
-					},
-				},
-			})
-			_, err = layout.Write(outputLayout, idx)
-			require.NoError(t, err)
-			src, err := oci.ParseImageSpec("oci://" + outputLayout)
-			require.NoError(t, err)
-			policy, err := Verify(ctx, src, policyOpts)
-			require.NoError(t, err)
-			assert.Equalf(t, OutcomeSuccess, policy.Outcome, "Policy should have been found")
-
-			var allEnvelopes []*test.AnnotatedStatement
-			for _, predicate := range []string{intoto.PredicateSPDX, v02.PredicateSLSAProvenance, attestation.VSAPredicateType} {
-				mt, _ := attestation.DSSEMediaType(predicate)
-				statements, err := test.ExtractAnnotatedStatements(outputLayout, mt)
-				require.NoError(t, err)
-				allEnvelopes = append(allEnvelopes, statements...)
-
-				for _, stmt := range statements {
-					assert.Equalf(t, predicate, stmt.Annotations[oci.InTotoPredicateType], "expected predicate-type annotation to be set to %s, got %s", predicate, stmt.Annotations[oci.InTotoPredicateType])
-					assert.Equalf(t, LifecycleStageExperimental, stmt.Annotations[InTotoReferenceLifecycleStage], "expected reference lifecycle stage annotation to be set to %s, got %s", LifecycleStageExperimental, stmt.Annotations[InTotoReferenceLifecycleStage])
-				}
-			}
-			assert.Equalf(t, tc.expectedAttestations, len(allEnvelopes), "expected %d attestations, got %d", tc.expectedAttestations, len(allEnvelopes))
-			statements, err := test.ExtractAnnotatedStatements(outputLayout, intoto.PayloadType)
-			require.NoError(t, err)
-			assert.Equalf(t, tc.expectedStatements, len(statements), "expected %d statement, got %d", tc.expectedStatements, len(statements))
-		})
-	}
-}
-
-func TestAddAttestation(t *testing.T) {
-	ctx, signer := test.Setup(t)
-
-	expectedAttestations := 2
-	expectedStatements := 4
-
-	outputLayout := test.CreateTempDir(t, "", TestTempDir)
-	attIdx, err := oci.SubjectIndexFromPath(UnsignedTestImage)
-	require.NoError(t, err)
-
-	statementToAdd := &intoto.Statement{
-		StatementHeader: intoto.StatementHeader{
-			PredicateType: attestation.VSAPredicateType,
-			Type:          intoto.StatementInTotoV01,
-			Subject: []intoto.Subject{
-				{
-					Name: attIdx.Name,
-					Digest: map[string]string{
-						"sha256": "da8b190665956ea07890a0273e2a9c96bfe291662f08e2860e868eef69c34620",
-					},
-				},
-				{
-					Name: attIdx.Name,
-					Digest: map[string]string{
-						"sha256": "7a76cec943853f9f7105b1976afa1bf7cd5bb6afc4e9d5852dd8da7cf81ae86e",
-					},
-				},
-			},
-		},
-	}
-
-	signedIndex, err := AddAttestation(ctx, attIdx.Index, statementToAdd, signer)
-	require.NoError(t, err)
-
-	// output signed attestations
-	idx := v1.ImageIndex(empty.Index)
-	idx = mutate.AppendManifests(idx, mutate.IndexAddendum{
-		Add: signedIndex,
-		Descriptor: v1.Descriptor{
-			Annotations: map[string]string{
-				oci.OciReferenceTarget: attIdx.Name,
-			},
-		},
-	})
-	_, err = layout.Write(outputLayout, idx)
-	require.NoError(t, err)
-
-	var allEnvelopes []*test.AnnotatedStatement
-	mt, _ := attestation.DSSEMediaType(attestation.VSAPredicateType)
-	statements, err := test.ExtractAnnotatedStatements(outputLayout, mt)
-	require.NoError(t, err)
-	allEnvelopes = append(allEnvelopes, statements...)
-
-	for _, stmt := range statements {
-		assert.Equalf(t, attestation.VSAPredicateType, stmt.Annotations[oci.InTotoPredicateType], "expected predicate-type annotation to be set to %s, got %s", attestation.VSAPredicateType, stmt.Annotations[oci.InTotoPredicateType])
-		assert.Equalf(t, LifecycleStageExperimental, stmt.Annotations[InTotoReferenceLifecycleStage], "expected reference lifecycle stage annotation to be set to %s, got %s", LifecycleStageExperimental, stmt.Annotations[InTotoReferenceLifecycleStage])
-	}
-	assert.Equalf(t, expectedAttestations, len(allEnvelopes), "expected %d attestations, got %d", expectedAttestations, len(allEnvelopes))
-	statements, err = test.ExtractAnnotatedStatements(outputLayout, intoto.PayloadType)
-	fmt.Printf("statements: %+v\n", statements)
-	require.NoError(t, err)
-	assert.Equalf(t, expectedStatements, len(statements), "expected %d statement, got %d", expectedStatements, len(statements))
-}
-
-func TestAddSignedLayerAnnotations(t *testing.T) {
-	testCases := []struct {
-		name    string
-		replace bool
-	}{
-		{"replaced", true},
-		{"not replaced", false},
-	}
-
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-			data := []byte("signed")
-			signedLayer := static.NewLayer(data, types.MediaType(intoto.PayloadType))
-			signedLayers := []mutate.Addendum{
-				{
-					Layer:       signedLayer,
-					Annotations: map[string]string{"test": "test"},
-				},
-			}
-			data = []byte("test")
-			testLayer := static.NewLayer(data, types.MediaType(intoto.PayloadType))
-			mediaType := types.OCIManifestSchema1
-			opts := &attestation.SigningOptions{
-				Replace: tc.replace,
-			}
-			manifest := attestation.AttestationManifest{
-				MediaType: mediaType,
-				Attestation: attestation.AttestationImage{
-					Image: empty.Image,
-					Layers: []attestation.AttestationLayer{
-						{
-							Layer:     testLayer,
-							Statement: &intoto.Statement{},
-						},
-					},
-				},
-				SubjectDescriptor: &v1.Descriptor{},
-			}
-			newImg, err := addSignedLayers(signedLayers, manifest, opts)
-			require.NoError(t, err)
-			mf, _ := newImg.RawManifest()
-			type Annotations struct {
-				Annotations map[string]string `json:"annotations"`
-			}
-			type Layers struct {
-				Layers []Annotations `json:"layers"`
-			}
-			l := &Layers{}
-			err = json.Unmarshal(mf, l)
-			require.NoError(t, err)
-			_, ok := l.Layers[0].Annotations["test"]
-			assert.Truef(t, ok, "missing annotations")
-		})
-	}
-}

pkg/attest/types.go

@@ -1,40 +0,0 @@
-package attest
-
-import (
-	"fmt"
-
-	"github.com/docker/attest/pkg/policy"
-	intoto "github.com/in-toto/in-toto-golang/in_toto"
-)
-
-const (
-	InTotoReferenceLifecycleStage = "vnd.docker.lifecycle-stage"
-	LifecycleStageExperimental    = "experimental"
-)
-
-type Outcome string
-
-const (
-	OutcomeSuccess  Outcome = "success"
-	OutcomeFailure  Outcome = "failure"
-	OutcomeNoPolicy Outcome = "no_policy"
-)
-
-func (o Outcome) StringForVSA() (string, error) {
-	switch o {
-	case OutcomeSuccess:
-		return "PASSED", nil
-	case OutcomeFailure:
-		return "FAILED", nil
-	default:
-		return "", fmt.Errorf("unknown outcome: %s", o)
-	}
-}
-
-type VerificationResult struct {
-	Outcome    Outcome
-	Policy     *policy.Policy
-	Input      *policy.PolicyInput
-	VSA        *intoto.Statement
-	Violations []policy.Violation
-}

pkg/attest/verify.go

@@ -1,144 +0,0 @@
-package attest
-
-import (
-	"context"
-	"fmt"
-	"time"
-
-	"github.com/docker/attest/pkg/attestation"
-	"github.com/docker/attest/pkg/config"
-	"github.com/docker/attest/pkg/oci"
-	"github.com/docker/attest/pkg/policy"
-	intoto "github.com/in-toto/in-toto-golang/in_toto"
-)
-
-func Verify(ctx context.Context, src *oci.ImageSpec, opts *policy.PolicyOptions) (result *VerificationResult, err error) {
-	// so that we can resolve mapping from the image name earlier
-	detailsResolver, err := policy.CreateImageDetailsResolver(src)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create image details resolver: %w", err)
-	}
-	if opts.AttestationStyle == "" {
-		opts.AttestationStyle = config.AttestationStyleReferrers
-	}
-	if opts.ReferrersRepo != "" && opts.AttestationStyle != config.AttestationStyleReferrers {
-		return nil, fmt.Errorf("referrers repo specified but attestation source not set to referrers")
-	}
-	pctx, err := policy.ResolvePolicy(ctx, detailsResolver, opts)
-	if err != nil {
-		return nil, fmt.Errorf("failed to resolve policy: %w", err)
-	}
-
-	if pctx == nil {
-		return &VerificationResult{
-			Outcome: OutcomeNoPolicy,
-		}, nil
-	}
-	// this is overriding the mapping with a referrers config. Useful for testing if nothing else
-	if opts.ReferrersRepo != "" {
-		pctx.Mapping.Attestations = &config.ReferrersConfig{
-			Repo:  opts.ReferrersRepo,
-			Style: config.AttestationStyleReferrers,
-		}
-	} else if opts.AttestationStyle == config.AttestationStyleAttached {
-		pctx.Mapping.Attestations = &config.ReferrersConfig{
-			Repo:  opts.ReferrersRepo,
-			Style: config.AttestationStyleAttached,
-		}
-	}
-	// because we have a mapping now, we can select a resolver based on its contents (ie. referrers or attached)
-	resolver, err := policy.CreateAttestationResolver(detailsResolver, pctx.Mapping)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create attestation resolver: %w", err)
-	}
-	result, err = VerifyAttestations(ctx, resolver, pctx)
-	if err != nil {
-		return nil, fmt.Errorf("failed to evaluate policy: %w", err)
-	}
-	return result, nil
-}
-
-func ToPolicyResult(p *policy.Policy, input *policy.PolicyInput, result *policy.Result) (*VerificationResult, error) {
-	dgst, err := oci.SplitDigest(input.Digest)
-	if err != nil {
-		return nil, fmt.Errorf("failed to split digest: %w", err)
-	}
-	subject := intoto.Subject{
-		Name:   input.Purl,
-		Digest: dgst,
-	}
-	resourceUri, err := attestation.ToVSAResourceURI(subject)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create resource uri: %w", err)
-	}
-
-	var outcome Outcome
-	if result.Success {
-		outcome = OutcomeSuccess
-	} else {
-		outcome = OutcomeFailure
-	}
-
-	outcomeStr, err := outcome.StringForVSA()
-	if err != nil {
-		return nil, err
-	}
-
-	return &VerificationResult{
-		Policy:     p,
-		Outcome:    outcome,
-		Violations: result.Violations,
-		Input:      input,
-		VSA: &intoto.Statement{
-			StatementHeader: intoto.StatementHeader{
-				PredicateType: attestation.VSAPredicateType,
-				Type:          intoto.StatementInTotoV01,
-				Subject:       result.Summary.Subjects,
-			},
-			Predicate: attestation.VSAPredicate{
-				Verifier: attestation.VSAVerifier{
-					ID: result.Summary.Verifier,
-				},
-				TimeVerified:       time.Now().UTC().Format(time.RFC3339),
-				ResourceUri:        resourceUri,
-				Policy:             attestation.VSAPolicy{URI: result.Summary.PolicyURI},
-				VerificationResult: outcomeStr,
-				VerifiedLevels:     result.Summary.SLSALevels,
-			},
-		},
-	}, nil
-}
-
-func VerifyAttestations(ctx context.Context, resolver oci.AttestationResolver, pctx *policy.Policy) (*VerificationResult, error) {
-	digest, err := resolver.ImageDigest(ctx)
-	if err != nil {
-		return nil, fmt.Errorf("failed to get image digest: %w", err)
-	}
-	name, err := resolver.ImageName(ctx)
-	if err != nil {
-		return nil, fmt.Errorf("failed to get image name: %w", err)
-	}
-	platform, err := resolver.ImagePlatform(ctx)
-	if err != nil {
-		return nil, err
-	}
-	purl, canonical, err := oci.RefToPURL(name, platform)
-	if err != nil {
-		return nil, fmt.Errorf("failed to convert ref to purl: %w", err)
-	}
-	input := &policy.PolicyInput{
-		Digest:      digest,
-		Purl:        purl,
-		IsCanonical: canonical,
-	}
-
-	evaluator, err := policy.GetPolicyEvaluator(ctx)
-	if err != nil {
-		return nil, err
-	}
-	result, err := evaluator.Evaluate(ctx, resolver, pctx, input)
-	if err != nil {
-		return nil, fmt.Errorf("policy evaluation failed: %w", err)
-	}
-	return ToPolicyResult(pctx, input, result)
-}

pkg/attest/verify_test.go

@@ -1,240 +0,0 @@
-package attest
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"os"
-	"path/filepath"
-	"testing"
-
-	"github.com/docker/attest/internal/test"
-	"github.com/docker/attest/pkg/attestation"
-	"github.com/docker/attest/pkg/oci"
-	"github.com/docker/attest/pkg/policy"
-	v1 "github.com/google/go-containerregistry/pkg/v1"
-	"github.com/google/go-containerregistry/pkg/v1/empty"
-	"github.com/google/go-containerregistry/pkg/v1/layout"
-	"github.com/google/go-containerregistry/pkg/v1/mutate"
-	intoto "github.com/in-toto/in-toto-golang/in_toto"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-var (
-	ExampleAttestation = filepath.Join("..", "..", "test", "testdata", "example_attestation.json")
-)
-
-const (
-	LinuxAMD64 = "linux/amd64"
-)
-
-func TestVerifyAttestations(t *testing.T) {
-	ex, err := os.ReadFile(ExampleAttestation)
-	assert.NoError(t, err)
-
-	var env = new(attestation.Envelope)
-	err = json.Unmarshal(ex, env)
-	assert.NoError(t, err)
-	resolver := &oci.MockResolver{
-		Envs: []*attestation.Envelope{env},
-	}
-
-	testCases := []struct {
-		name                  string
-		policyEvaluationError error
-		expectedError         error
-	}{
-		{"policy ok", nil, nil},
-		{"policy error", fmt.Errorf("policy error"), fmt.Errorf("policy evaluation failed: policy error")},
-	}
-
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-
-			mockPE := policy.MockPolicyEvaluator{
-				EvaluateFunc: func(ctx context.Context, resolver oci.AttestationResolver, pctx *policy.Policy, input *policy.PolicyInput) (*policy.Result, error) {
-					return policy.AllowedResult(), tc.policyEvaluationError
-				},
-			}
-
-			ctx := policy.WithPolicyEvaluator(context.Background(), &mockPE)
-			_, err := VerifyAttestations(ctx, resolver, nil)
-			if tc.expectedError != nil {
-				if assert.Error(t, err) {
-					assert.Equal(t, tc.expectedError.Error(), err.Error())
-				}
-			} else {
-				assert.NoError(t, err)
-			}
-		})
-	}
-}
-
-func TestVSA(t *testing.T) {
-	ctx, signer := test.Setup(t)
-	ctx = policy.WithPolicyEvaluator(ctx, policy.NewRegoEvaluator(true))
-	// setup an image with signed attestations
-	outputLayout := test.CreateTempDir(t, "", TestTempDir)
-
-	opts := &attestation.SigningOptions{
-		Replace: true,
-	}
-	attIdx, err := oci.SubjectIndexFromPath(UnsignedTestImage)
-	assert.NoError(t, err)
-	signedIndex, err := Sign(ctx, attIdx.Index, signer, opts)
-	assert.NoError(t, err)
-
-	// output signed attestations
-	idx := v1.ImageIndex(empty.Index)
-	idx = mutate.AppendManifests(idx, mutate.IndexAddendum{
-		Add: signedIndex,
-		Descriptor: v1.Descriptor{
-			Annotations: map[string]string{
-				oci.OciReferenceTarget: attIdx.Name,
-			},
-		},
-	})
-	_, err = layout.Write(outputLayout, idx)
-	assert.NoError(t, err)
-
-	// mocked vsa query should pass
-	policyOpts := &policy.PolicyOptions{
-		LocalPolicyDir: PassPolicyDir,
-	}
-	src, err := oci.ParseImageSpec("oci://"+outputLayout, oci.WithPlatform(LinuxAMD64))
-	require.NoError(t, err)
-	results, err := Verify(ctx, src, policyOpts)
-	require.NoError(t, err)
-	assert.Equal(t, OutcomeSuccess, results.Outcome)
-	assert.Empty(t, results.Violations)
-
-	if assert.NotNil(t, results.Input) {
-		assert.Equal(t, "sha256:da8b190665956ea07890a0273e2a9c96bfe291662f08e2860e868eef69c34620", results.Input.Digest)
-		assert.False(t, results.Input.IsCanonical)
-	}
-
-	assert.Equal(t, intoto.StatementInTotoV01, results.VSA.Type)
-	assert.Equal(t, attestation.VSAPredicateType, results.VSA.PredicateType)
-	assert.Len(t, results.VSA.Subject, 1)
-
-	require.IsType(t, attestation.VSAPredicate{}, results.VSA.Predicate)
-	attestationPredicate := results.VSA.Predicate.(attestation.VSAPredicate)
-
-	assert.Equal(t, "PASSED", attestationPredicate.VerificationResult)
-	assert.Equal(t, "docker-official-images", attestationPredicate.Verifier.ID)
-	assert.Equal(t, []string{"SLSA_BUILD_LEVEL_3"}, attestationPredicate.VerifiedLevels)
-	assert.Equal(t, "https://docker.com/official/policy/v0.1", attestationPredicate.Policy.URI)
-}
-
-func TestVerificationFailure(t *testing.T) {
-	ctx, signer := test.Setup(t)
-	ctx = policy.WithPolicyEvaluator(ctx, policy.NewRegoEvaluator(true))
-	// setup an image with signed attestations
-	outputLayout := test.CreateTempDir(t, "", TestTempDir)
-
-	opts := &attestation.SigningOptions{
-		Replace: true,
-	}
-	attIdx, err := oci.SubjectIndexFromPath(UnsignedTestImage)
-	assert.NoError(t, err)
-	signedIndex, err := Sign(ctx, attIdx.Index, signer, opts)
-	assert.NoError(t, err)
-
-	// output signed attestations
-	idx := v1.ImageIndex(empty.Index)
-	idx = mutate.AppendManifests(idx, mutate.IndexAddendum{
-		Add: signedIndex,
-		Descriptor: v1.Descriptor{
-			Annotations: map[string]string{
-				oci.OciReferenceTarget: attIdx.Name,
-			},
-		},
-	})
-	_, err = layout.Write(outputLayout, idx)
-	assert.NoError(t, err)
-
-	// mocked vsa query should fail
-	policyOpts := &policy.PolicyOptions{
-		LocalPolicyDir: FailPolicyDir,
-	}
-	src, err := oci.ParseImageSpec("oci://"+outputLayout, oci.WithPlatform(LinuxAMD64))
-	require.NoError(t, err)
-	results, err := Verify(ctx, src, policyOpts)
-	require.NoError(t, err)
-	assert.Equal(t, OutcomeFailure, results.Outcome)
-	assert.Len(t, results.Violations, 1)
-
-	violation := results.Violations[0]
-	assert.Equal(t, "missing_attestation", violation.Type)
-	assert.Equal(t, "Attestation missing for subject", violation.Description)
-	assert.Nil(t, violation.Attestation)
-
-	assert.Equal(t, intoto.StatementInTotoV01, results.VSA.Type)
-	assert.Equal(t, attestation.VSAPredicateType, results.VSA.PredicateType)
-	assert.Len(t, results.VSA.Subject, 1)
-
-	require.IsType(t, attestation.VSAPredicate{}, results.VSA.Predicate)
-	attestationPredicate := results.VSA.Predicate.(attestation.VSAPredicate)
-
-	assert.Equal(t, "FAILED", attestationPredicate.VerificationResult)
-	assert.Equal(t, "docker-official-images", attestationPredicate.Verifier.ID)
-	assert.Equal(t, []string{"SLSA_BUILD_LEVEL_3"}, attestationPredicate.VerifiedLevels)
-	assert.Equal(t, "https://docker.com/official/policy/v0.1", attestationPredicate.Policy.URI)
-}
-
-// test signing without a TL entry
-func TestSignVerifyNoTL(t *testing.T) {
-	ctx, signer := test.Setup(t)
-	ctx = policy.WithPolicyEvaluator(ctx, policy.NewRegoEvaluator(true))
-	// setup an image with signed attestations
-	outputLayout := test.CreateTempDir(t, "", TestTempDir)
-
-	testCases := []struct {
-		name      string
-		signTL    bool
-		policyDir string
-		success   bool
-	}{
-		{name: "happy path", signTL: true, policyDir: PassNoTLPolicyDir, success: true},
-		{name: "sign tl, verify no tl", signTL: true, policyDir: PassPolicyDir, success: false},
-		{name: "no tl", signTL: false, policyDir: PassPolicyDir, success: false},
-	}
-
-	attIdx, err := oci.SubjectIndexFromPath(UnsignedTestImage)
-	assert.NoError(t, err)
-
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-			opts := &attestation.SigningOptions{
-				Replace: true,
-				SkipTL:  tc.signTL,
-			}
-
-			signedIndex, err := Sign(ctx, attIdx.Index, signer, opts)
-			assert.NoError(t, err)
-
-			// output signed attestations
-			idx := v1.ImageIndex(empty.Index)
-			idx = mutate.AppendManifests(idx, mutate.IndexAddendum{
-				Add: signedIndex,
-				Descriptor: v1.Descriptor{
-					Annotations: map[string]string{
-						oci.OciReferenceTarget: attIdx.Name,
-					},
-				},
-			})
-			_, err = layout.Write(outputLayout, idx)
-			assert.NoError(t, err)
-
-			policyOpts := &policy.PolicyOptions{
-				LocalPolicyDir: tc.policyDir,
-			}
-			src, err := oci.ParseImageSpec("oci://"+outputLayout, oci.WithPlatform(LinuxAMD64))
-			require.NoError(t, err)
-			results, err := Verify(ctx, src, policyOpts)
-			require.NoError(t, err)
-			assert.Equal(t, OutcomeSuccess, results.Outcome)
-		})
-	}
-}

pkg/attestation/attestation.go

@@ -1,91 +0,0 @@
-package attestation
-
-import (
-	"encoding/json"
-	"fmt"
-	"maps"
-
-	v1 "github.com/google/go-containerregistry/pkg/v1"
-	"github.com/google/go-containerregistry/pkg/v1/partial"
-	"github.com/google/go-containerregistry/pkg/v1/types"
-	intoto "github.com/in-toto/in-toto-golang/in_toto"
-)
-
-// GetAttestationManifestsFromIndex extracts all attestation manifests from an index
-func GetAttestationManifestsFromIndex(index v1.ImageIndex) ([]AttestationManifest, error) {
-	idx, err := index.IndexManifest()
-	if err != nil {
-		return nil, fmt.Errorf("failed to extract IndexManifest from ImageIndex: %w", err)
-	}
-	subjects := make(map[string]*v1.Descriptor)
-	for _, subject := range idx.Manifests {
-		subjects[subject.Digest.String()] = &subject
-	}
-
-	var attestationManifests []AttestationManifest
-	for _, manifest := range idx.Manifests {
-
-		if manifest.Annotations[DockerReferenceType] == AttestationManifestType {
-			subject := subjects[manifest.Annotations[DockerReferenceDigest]]
-			if subject == nil {
-				return nil, fmt.Errorf("failed to find subject for attestation manifest: %w", err)
-			}
-			attestationImage, err := index.Image(manifest.Digest)
-			if err != nil {
-				return nil, fmt.Errorf("failed to extract attestation image with digest %s: %w", manifest.Digest.String(), err)
-			}
-			attestationLayers, err := GetAttestationsFromImage(attestationImage)
-			if err != nil {
-				return nil, fmt.Errorf("failed to get attestations from image: %w", err)
-			}
-			attestationManifests = append(attestationManifests,
-				AttestationManifest{
-					Descriptor:        manifest,
-					SubjectDescriptor: subject,
-					Attestation: AttestationImage{
-						Layers: attestationLayers,
-						Image:  attestationImage},
-					MediaType:   manifest.MediaType,
-					Annotations: manifest.Annotations,
-					Digest:      manifest.Digest})
-		}
-	}
-	return attestationManifests, nil
-}
-
-// GetAttestationsFromImage extracts all attestation layers from an image
-func GetAttestationsFromImage(image v1.Image) ([]AttestationLayer, error) {
-	layers, err := image.Layers()
-	if err != nil {
-		return nil, fmt.Errorf("failed to extract layers from image: %w", err)
-	}
-	var attestationLayers []AttestationLayer
-	for _, layer := range layers {
-		// parse layer blob as json
-		r, err := layer.Uncompressed()
-		if err != nil {
-			return nil, fmt.Errorf("failed to get layer contents: %w", err)
-		}
-		defer r.Close()
-		mt, err := layer.MediaType()
-		if err != nil {
-			return nil, fmt.Errorf("failed to get layer media type: %w", err)
-		}
-		layerDesc, err := partial.Descriptor(layer)
-		if err != nil {
-			return nil, fmt.Errorf("failed to get descriptor for layer: %w", err)
-		}
-		// copy original annotations
-		ann := maps.Clone(layerDesc.Annotations)
-		// only decode intoto statements
-		var stmt = new(intoto.Statement)
-		if mt == types.MediaType(intoto.PayloadType) {
-			err = json.NewDecoder(r).Decode(&stmt)
-			if err != nil {
-				return nil, fmt.Errorf("failed to decode statement layer contents: %w", err)
-			}
-		}
-		attestationLayers = append(attestationLayers, AttestationLayer{Layer: layer, MediaType: mt, Statement: stmt, Annotations: ann})
-	}
-	return attestationLayers, nil
-}

pkg/attestation/referrers_test.go

@@ -1,253 +0,0 @@
-package attestation_test
-
-import (
-	"fmt"
-	"net/http/httptest"
-	"net/url"
-	"path/filepath"
-	"testing"
-
-	"github.com/docker/attest/internal/test"
-	"github.com/docker/attest/pkg/attest"
-	"github.com/docker/attest/pkg/attestation"
-	"github.com/docker/attest/pkg/config"
-	"github.com/docker/attest/pkg/mirror"
-	"github.com/docker/attest/pkg/oci"
-	"github.com/docker/attest/pkg/policy"
-	"github.com/google/go-containerregistry/pkg/name"
-	"github.com/google/go-containerregistry/pkg/registry"
-	"github.com/google/go-containerregistry/pkg/v1/remote"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-var (
-	UnsignedTestImage   = filepath.Join("..", "..", "test", "testdata", "unsigned-test-image")
-	NoProvenanceImage   = filepath.Join("..", "..", "test", "testdata", "no-provenance-image")
-	PassPolicyDir       = filepath.Join("..", "..", "test", "testdata", "local-policy-pass")
-	LocalPolicy         = filepath.Join("..", "..", "test", "testdata", "local-policy")
-	LocalPolicyAttached = filepath.Join("..", "..", "test", "testdata", "local-policy-attached")
-	PassNoTLPolicyDir   = filepath.Join("..", "..", "test", "testdata", "local-policy-no-tl")
-	FailPolicyDir       = filepath.Join("..", "..", "test", "testdata", "local-policy-fail")
-	TestTempDir         = "attest-sign-test"
-)
-
-func TestAttestationReferenceTypes(t *testing.T) {
-	ctx, signer := test.Setup(t)
-	ctx = policy.WithPolicyEvaluator(ctx, policy.NewRegoEvaluator(true))
-	platforms := []string{"linux/amd64", "linux/arm64"}
-	for _, tc := range []struct {
-		server            *httptest.Server
-		referrersServer   *httptest.Server
-		skipSubject       bool
-		useDigest         bool
-		referrersRepo     string
-		attestationSource config.AttestationStyle
-		expectFailure     bool
-		policyDir         string
-	}{
-		{
-			server: httptest.NewServer(registry.New(registry.WithReferrersSupport(true))),
-		},
-		{
-			server: httptest.NewServer(registry.New()),
-		},
-		{
-			server:            httptest.NewServer(registry.New(registry.WithReferrersSupport(true))),
-			skipSubject:       true,
-			attestationSource: config.AttestationStyleAttached,
-		},
-		{
-			server:    httptest.NewServer(registry.New(registry.WithReferrersSupport(true))),
-			useDigest: true,
-		},
-		{
-			server:            httptest.NewServer(registry.New(registry.WithReferrersSupport(true))),
-			expectFailure:     true, //mismatched args
-			attestationSource: config.AttestationStyleAttached,
-			referrersRepo:     "referrers",
-		},
-		{
-			server:            httptest.NewServer(registry.New(registry.WithReferrersSupport(true))),
-			expectFailure:     true, // no policy
-			attestationSource: config.AttestationStyleReferrers,
-			referrersRepo:     "referrers",
-		},
-		{
-			server:            httptest.NewServer(registry.New(registry.WithReferrersSupport(true))),
-			attestationSource: config.AttestationStyleReferrers,
-		},
-		{
-			server:            httptest.NewServer(registry.New(registry.WithReferrersSupport(false))),
-			attestationSource: config.AttestationStyleReferrers,
-			referrersServer:   httptest.NewServer(registry.New(registry.WithReferrersSupport(true))),
-		},
-	} {
-		t.Run(fmt.Sprint(tc), func(t *testing.T) {
-			s := tc.server
-			defer s.Close()
-
-			if tc.referrersServer != nil {
-				defer tc.referrersServer.Close()
-			}
-			u, err := url.Parse(s.URL)
-			require.NoError(t, err)
-
-			opts := &attestation.SigningOptions{
-				Replace:     true,
-				SkipSubject: tc.skipSubject,
-			}
-			attIdx, err := oci.SubjectIndexFromPath(UnsignedTestImage)
-			require.NoError(t, err)
-
-			indexName := fmt.Sprintf("%s/repo:root", u.Host)
-			require.NoError(t, err)
-
-			if tc.referrersServer != nil {
-				ru, err := url.Parse(s.URL)
-				require.NoError(t, err)
-				repo := fmt.Sprintf("%s/referrers", ru.Host)
-				tc.referrersRepo = repo
-				images, err := attest.SignedAttestationImages(ctx, attIdx.Index, signer, opts)
-				require.NoError(t, err)
-				err = mirror.PushIndexToRegistry(attIdx.Index, indexName)
-				for _, img := range images {
-					err = mirror.PushImageToRegistry(img.Image, fmt.Sprintf("%s:tag-does-not-matter", repo))
-					require.NoError(t, err)
-				}
-			} else {
-				signedIndex, err := attest.Sign(ctx, attIdx.Index, signer, opts)
-				require.NoError(t, err)
-				err = mirror.PushIndexToRegistry(signedIndex, indexName)
-				require.NoError(t, err)
-			}
-
-			for _, platform := range platforms {
-				// can eval policy in the normal way
-				ref := indexName
-				if tc.useDigest {
-					options := oci.WithOptions(ctx, nil)
-					subjectRef, err := name.ParseReference(indexName)
-					require.NoError(t, err)
-					desc, err := remote.Index(subjectRef, options...)
-					require.NoError(t, err)
-					idxDigest, err := desc.Digest()
-					require.NoError(t, err)
-					ref = fmt.Sprintf("%s/repo@%s", u.Host, idxDigest.String())
-				}
-
-				policyOpts := &policy.PolicyOptions{
-					LocalPolicyDir: LocalPolicy,
-				}
-				if tc.policyDir != "" {
-					policyOpts.LocalPolicyDir = tc.policyDir
-				}
-
-				if tc.referrersRepo != "" {
-					policyOpts.ReferrersRepo = tc.referrersRepo
-				}
-
-				if tc.attestationSource != "" {
-					policyOpts.AttestationStyle = tc.attestationSource
-				}
-				src, err := oci.ParseImageSpec(ref, oci.WithPlatform(platform))
-				require.NoError(t, err)
-				results, err := attest.Verify(ctx, src, policyOpts)
-				if tc.expectFailure {
-					require.Error(t, err)
-					continue
-				}
-				require.NoError(t, err)
-				assert.Equal(t, attest.OutcomeSuccess, results.Outcome)
-
-				if !tc.skipSubject {
-					// can evaluate policy using referrers
-					if tc.useDigest {
-						p, err := oci.ParsePlatform(platform)
-						require.NoError(t, err)
-						options := oci.WithOptions(ctx, p)
-						subjectRef, err := name.ParseReference(indexName)
-						require.NoError(t, err)
-						desc, err := remote.Image(subjectRef, options...)
-						require.NoError(t, err)
-						subjectDigest, err := desc.Digest()
-						require.NoError(t, err)
-						ref = fmt.Sprintf("%s/repo@%s", u.Host, subjectDigest.String())
-					}
-					src, err := oci.ParseImageSpec(ref, oci.WithPlatform(platform))
-					require.NoError(t, err)
-					results, err = attest.Verify(ctx, src, policyOpts)
-					require.NoError(t, err)
-					assert.Equal(t, attest.OutcomeSuccess, results.Outcome)
-				}
-			}
-		})
-	}
-}
-
-func TestReferencesInDifferentRepo(t *testing.T) {
-	ctx, signer := test.Setup(t)
-	repoName := "repo"
-	for _, tc := range []struct {
-		server    *httptest.Server
-		refServer *httptest.Server
-	}{
-		{
-			server:    httptest.NewServer(registry.New(registry.WithReferrersSupport(true))),
-			refServer: httptest.NewServer(registry.New(registry.WithReferrersSupport(true))),
-		},
-		{
-			server:    httptest.NewServer(registry.New()),
-			refServer: httptest.NewServer(registry.New(registry.WithReferrersSupport(true))),
-		},
-	} {
-		server := tc.server
-		defer server.Close()
-		serverUrl, err := url.Parse(server.URL)
-		require.NoError(t, err)
-
-		refServer := tc.refServer
-		defer refServer.Close()
-		refServerUrl, err := url.Parse(refServer.URL)
-		require.NoError(t, err)
-
-		opts := &attestation.SigningOptions{
-			Replace: true,
-			SkipTL:  true,
-		}
-		attIdx, err := oci.SubjectIndexFromPath(UnsignedTestImage)
-		require.NoError(t, err)
-
-		indexName := fmt.Sprintf("%s/%s:latest", serverUrl.Host, repoName)
-		err = mirror.PushIndexToRegistry(attIdx.Index, indexName)
-		require.NoError(t, err)
-
-		signedImages, err := attest.SignedAttestationImages(ctx, attIdx.Index, signer, opts)
-		require.NoError(t, err)
-
-		// push signed attestation image to the ref server
-		for _, img := range signedImages {
-			// push references using subject-digest.att convention
-			err = mirror.PushImageToRegistry(img.Image, fmt.Sprintf("%s/%s:tag-does-not-matter", refServerUrl.Host, repoName))
-			require.NoError(t, err)
-		}
-		mfs2, err := attIdx.Index.IndexManifest()
-		require.NoError(t, err)
-		for _, mf := range mfs2.Manifests {
-			//skip signed/unsigned attestations
-			if mf.Annotations[attestation.DockerReferenceType] == attestation.AttestationManifestType {
-				continue
-			}
-			// can evaluate policy using referrers in a different repo
-			referencedImage := fmt.Sprintf("%s@%s", indexName, mf.Digest.String())
-			policyOpts := &policy.PolicyOptions{
-				LocalPolicyDir: PassPolicyDir,
-			}
-			src, err := oci.ParseImageSpec(referencedImage)
-			require.NoError(t, err)
-			results, err := attest.Verify(ctx, src, policyOpts)
-			require.NoError(t, err)
-			assert.Equal(t, attest.OutcomeSuccess, results.Outcome)
-		}
-	}
-}

pkg/attestation/sign_test.go

@@ -1,151 +0,0 @@
-package attestation_test
-
-import (
-	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/rand"
-	"encoding/json"
-	"fmt"
-	"testing"
-	"time"
-
-	"github.com/docker/attest/internal/test"
-	"github.com/docker/attest/pkg/attestation"
-	"github.com/docker/attest/pkg/signerverifier"
-	intoto "github.com/in-toto/in-toto-golang/in_toto"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-func TestSignVerifyAttestation(t *testing.T) {
-	ctx, signer := test.Setup(t)
-	stmt := &intoto.Statement{
-		StatementHeader: intoto.StatementHeader{
-			Type:          intoto.StatementInTotoV01,
-			PredicateType: intoto.PredicateSPDX,
-		},
-		Predicate: "test",
-	}
-
-	payload, err := json.Marshal(stmt)
-	require.NoError(t, err)
-	opts := &attestation.SigningOptions{}
-	env, err := attestation.SignDSSE(ctx, payload, signer, opts)
-	require.NoError(t, err)
-
-	// marshal envelope to json to test for bugs when marshaling envelope data
-	serializedEnv, err := json.Marshal(env)
-	require.NoError(t, err)
-	deserializedEnv := new(attestation.Envelope)
-	err = json.Unmarshal(serializedEnv, deserializedEnv)
-	require.NoError(t, err)
-
-	// signer.Public() calls AWS API when using AWS signer, use attestation.GetPublicVerificationKey() to get key from TUF repo
-	// signer.Public() used here for test purposes
-	ecPub, ok := signer.Public().(*ecdsa.PublicKey)
-	assert.True(t, ok)
-	pem, err := signerverifier.ToPEM(ecPub)
-	assert.NoError(t, err)
-	keyId, err := signerverifier.KeyID(ecPub)
-	assert.NoError(t, err)
-
-	badKeyPriv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	require.NoError(t, err)
-	badKey := &badKeyPriv.PublicKey
-	badPEM, err := signerverifier.ToPEM(badKey)
-	require.NoError(t, err)
-
-	testCases := []struct {
-		name          string
-		keyId         string
-		pem           []byte
-		distrust      bool
-		from          time.Time
-		to            *time.Time
-		status        string
-		expectedError string
-	}{
-		{
-			name:          "all OK",
-			keyId:         keyId,
-			pem:           pem,
-			distrust:      false,
-			from:          time.Time{},
-			to:            nil,
-			status:        "active",
-			expectedError: "",
-		},
-		{
-			name:          "key not found",
-			keyId:         "someotherkey",
-			pem:           pem,
-			distrust:      false,
-			from:          time.Time{},
-			to:            nil,
-			status:        "active",
-			expectedError: fmt.Sprintf("key not found: %s", keyId),
-		},
-		{
-			name:          "key distrusted",
-			keyId:         keyId,
-			pem:           pem,
-			distrust:      true,
-			from:          time.Time{},
-			to:            nil,
-			status:        "active",
-			expectedError: "distrusted",
-		},
-		{
-			name:          "key not yet valid",
-			keyId:         keyId,
-			pem:           pem,
-			distrust:      false,
-			from:          time.Now().Add(time.Hour),
-			to:            nil,
-			status:        "active",
-			expectedError: "not yet valid",
-		},
-		{
-			name:          "key already revoked",
-			keyId:         keyId,
-			pem:           pem,
-			distrust:      false,
-			from:          time.Time{},
-			to:            new(time.Time),
-			status:        "revoked",
-			expectedError: "already revoked",
-		},
-		{
-			name:          "bad key",
-			keyId:         keyId,
-			pem:           badPEM,
-			distrust:      false,
-			from:          time.Time{},
-			to:            nil,
-			status:        "active",
-			expectedError: "signature is not valid",
-		},
-	}
-
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-			keyMeta := attestation.KeyMetadata{
-				ID:       tc.keyId,
-				PEM:      string(tc.pem),
-				Distrust: tc.distrust,
-				From:     tc.from,
-				To:       tc.to,
-				Status:   tc.status,
-			}
-			opts := &attestation.VerifyOptions{
-				Keys: attestation.Keys{keyMeta},
-			}
-			_, err = attestation.VerifyDSSE(ctx, deserializedEnv, opts)
-			if tc.expectedError != "" {
-				assert.Contains(t, err.Error(), tc.expectedError)
-			} else {
-				assert.NoError(t, err)
-			}
-		})
-	}
-}

pkg/attestation/types.go

@@ -1,106 +0,0 @@
-package attestation
-
-import (
-	"encoding/base64"
-	"fmt"
-
-	v1 "github.com/google/go-containerregistry/pkg/v1"
-	"github.com/google/go-containerregistry/pkg/v1/types"
-	intoto "github.com/in-toto/in-toto-golang/in_toto"
-	v02 "github.com/in-toto/in-toto-golang/in_toto/slsa_provenance/v0.2"
-	ociv1 "github.com/opencontainers/image-spec/specs-go/v1"
-)
-
-const (
-	DockerReferenceType        = "vnd.docker.reference.type"
-	AttestationManifestType    = "attestation-manifest"
-	DockerReferenceDigest      = "vnd.docker.reference.digest"
-	DockerDsseExtKind          = "application/vnd.docker.attestation-verification.v1+json"
-	RekorTlExtKind             = "Rekor"
-	OCIDescriptorDSSEMediaType = ociv1.MediaTypeDescriptor + "+dsse"
-)
-
-var base64Encoding = base64.StdEncoding.Strict()
-
-type AttestationLayer struct {
-	Statement   *intoto.Statement
-	Layer       v1.Layer
-	MediaType   types.MediaType
-	Annotations map[string]string
-}
-
-type AttestationImage struct {
-	Layers []AttestationLayer
-	Image  v1.Image
-}
-
-type SignedAttestationImage struct {
-	Image               v1.Image
-	Descriptor          *v1.Descriptor
-	AttestationManifest AttestationManifest
-}
-
-type AttestationManifest struct {
-	Descriptor        v1.Descriptor
-	Attestation       AttestationImage
-	MediaType         types.MediaType
-	Annotations       map[string]string
-	Digest            v1.Hash
-	SubjectDescriptor *v1.Descriptor
-}
-
-// the following types are needed until https://github.com/secure-systems-lab/dsse/pull/61 is merged
-type Envelope struct {
-	PayloadType string      `json:"payloadType"`
-	Payload     string      `json:"payload"`
-	Signatures  []Signature `json:"signatures"`
-}
-type Signature struct {
-	KeyID     string    `json:"keyid"`
-	Sig       string    `json:"sig"`
-	Extension Extension `json:"extension"`
-}
-type Extension struct {
-	Kind string              `json:"kind"`
-	Ext  DockerDsseExtension `json:"ext"`
-}
-
-type DockerDsseExtension struct {
-	Tl DockerTlExtension `json:"tl"`
-}
-
-type DockerTlExtension struct {
-	Kind string `json:"kind"`
-	Data any    `json:"data"`
-}
-
-type VerifyOptions struct {
-	Keys   []KeyMetadata `json:"keys"`
-	SkipTL bool          `json:"skip_tl"`
-}
-
-type SigningOptions struct {
-	// replace unsigned statements with signed attestations
-	Replace bool
-	// don't log to the configured transparency log
-	SkipTL bool
-	// don't add OCI subject field to attestation image
-	SkipSubject bool
-}
-
-func DSSEMediaType(predicateType string) (string, error) {
-	var predicateName string
-	switch predicateType {
-	case v02.PredicateSLSAProvenance:
-		predicateName = "provenance"
-	case intoto.PredicateSPDX:
-		predicateName = "spdx"
-	case VSAPredicateType:
-		predicateName = "verification_summary"
-
-	default:
-		return "", fmt.Errorf("unknown predicate type %q", predicateType)
-	}
-
-	return fmt.Sprintf("application/vnd.in-toto.%s+dsse", predicateName), nil
-}

pkg/attestation/verify.go

@@ -1,137 +0,0 @@
-package attestation
-
-import (
-	"context"
-	"crypto/ecdsa"
-	"crypto/x509"
-	"encoding/base64"
-	"encoding/json"
-	"fmt"
-	"time"
-
-	"github.com/docker/attest/internal/util"
-	"github.com/docker/attest/pkg/signerverifier"
-	"github.com/docker/attest/pkg/tlog"
-	intoto "github.com/in-toto/in-toto-golang/in_toto"
-	ociv1 "github.com/opencontainers/image-spec/specs-go/v1"
-	"github.com/secure-systems-lab/go-securesystemslib/dsse"
-)
-
-type KeyMetadata struct {
-	ID            string     `json:"id"`
-	PEM           string     `json:"key"`
-	From          time.Time  `json:"from"`
-	To            *time.Time `json:"to"`
-	Status        string     `json:"status"`
-	SigningFormat string     `json:"signing-format"`
-	Distrust      bool       `json:"distrust,omitempty"`
-}
-
-type Keys []KeyMetadata
-type KeysMap map[string]KeyMetadata
-
-func VerifyDSSE(ctx context.Context, env *Envelope, opts *VerifyOptions) ([]byte, error) {
-	// enforce payload type
-	if !ValidPayloadType(env.PayloadType) {
-		return nil, fmt.Errorf("unsupported payload type %s", env.PayloadType)
-	}
-
-	if len(env.Signatures) == 0 {
-		return nil, fmt.Errorf("no signatures found")
-	}
-
-	payload, err := base64Encoding.DecodeString(env.Payload)
-	if err != nil {
-		return nil, fmt.Errorf("error failed to decode payload: %w", err)
-	}
-
-	encPayload := dsse.PAE(env.PayloadType, payload)
-
-	// verify signatures and transparency log entry
-	for _, sig := range env.Signatures {
-		err := verifySignature(ctx, sig, encPayload, opts)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	return payload, nil
-}
-
-func verifySignature(ctx context.Context, sig Signature, payload []byte, opts *VerifyOptions) error {
-	keys := make(map[string]KeyMetadata, len(opts.Keys))
-	for _, key := range opts.Keys {
-		keys[key.ID] = key
-	}
-	keyMeta, ok := keys[sig.KeyID]
-	if !ok {
-		return fmt.Errorf("error key not found: %s", sig.KeyID)
-	}
-
-	if keyMeta.Distrust {
-		return fmt.Errorf("key %s is distrusted", keyMeta.ID)
-	}
-	// TODO: this is unmarshalling with MarshalPKIXPublicKey only for us to marshal it again
-	publicKey, err := signerverifier.Parse([]byte(keyMeta.PEM))
-	if err != nil {
-		return fmt.Errorf("failed to parse public key: %w", err)
-	}
-
-	if !opts.SkipTL {
-		t := tlog.GetTL(ctx)
-
-		if sig.Extension.Kind == "" {
-			return fmt.Errorf("error missing signature extension kind")
-		}
-		if sig.Extension.Kind != DockerDsseExtKind {
-			return fmt.Errorf("error unsupported signature extension kind: %s", sig.Extension.Kind)
-		}
-
-		// verify TL entry
-		if sig.Extension.Ext.Tl.Kind != RekorTlExtKind {
-			return fmt.Errorf("error unsupported TL extension kind: %s", sig.Extension.Ext.Tl.Kind)
-		}
-		entry := sig.Extension.Ext.Tl.Data
-		entryBytes, err := json.Marshal(entry)
-		if err != nil {
-			return fmt.Errorf("failed to marshal TL entry: %w", err)
-		}
-
-		integratedTime, err := t.VerifyLogEntry(ctx, entryBytes)
-		if err != nil {
-			return fmt.Errorf("TL entry failed verification: %w", err)
-		}
-		if integratedTime.Before(keyMeta.From) {
-			return fmt.Errorf("key %s was not yet valid at TL log time %s (key valid from %s)", keyMeta.ID, integratedTime, keyMeta.From)
-		}
-		if keyMeta.To != nil && !integratedTime.Before(*keyMeta.To) {
-			return fmt.Errorf("key %s was already %s at TL log time %s (key %s at %s)", keyMeta.ID, keyMeta.Status, integratedTime, keyMeta.Status, *keyMeta.To)
-		}
-		// verify TL entry payload
-		encodedPub, err := x509.MarshalPKIXPublicKey(publicKey)
-		if err != nil {
-			return fmt.Errorf("error failed to marshal public key: %w", err)
-		}
-		err = t.VerifyEntryPayload(entryBytes, payload, encodedPub)
-		if err != nil {
-			return fmt.Errorf("TL entry failed payload verification: %w", err)
-		}
-	}
-
-	// decode signature
-	signature, err := base64.StdEncoding.Strict().DecodeString(sig.Sig)
-	if err != nil {
-		return fmt.Errorf("error failed to decode signature: %w", err)
-	}
-	// verify payload ecdsa signature
-	ok = ecdsa.VerifyASN1(publicKey, util.SHA256(payload), signature)
-	if !ok {
-		return fmt.Errorf("payload signature is not valid")
-	}
-
-	return nil
-}
-
-func ValidPayloadType(payloadType string) bool {
-	return payloadType == intoto.PayloadType || payloadType == ociv1.MediaTypeDescriptor
-}

pkg/config/config.go

@@ -1,49 +0,0 @@
-package config
-
-import (
-	"fmt"
-	"os"
-	"path/filepath"
-
-	"github.com/docker/attest/pkg/tuf"
-	goyaml "gopkg.in/yaml.v3"
-)
-
-const (
-	MappingFilename = "mapping.yaml"
-)
-
-func LoadLocalMappings(configDir string) (*PolicyMappings, error) {
-	if configDir == "" {
-		return nil, nil
-	}
-	mappings := &PolicyMappings{}
-	path := filepath.Join(configDir, MappingFilename)
-	mappingFile, err := os.ReadFile(path)
-	if err != nil {
-		return nil, fmt.Errorf("failed to read local policy mapping file %s: %w", path, err)
-	}
-	err = goyaml.Unmarshal(mappingFile, mappings)
-	if err != nil {
-		return nil, fmt.Errorf("failed to unmarshal policy mapping file %s: %w", path, err)
-	}
-	return mappings, nil
-}
-
-func LoadTufMappings(tufClient tuf.TUFClient, localTargetsDir string) (*PolicyMappings, error) {
-	if tufClient == nil {
-		return nil, fmt.Errorf("tuf client not set")
-	}
-	filename := MappingFilename
-	_, fileContents, err := tufClient.DownloadTarget(filename, filepath.Join(localTargetsDir, filename))
-	if err != nil {
-		return nil, fmt.Errorf("failed to download policy mapping file %s: %w", filename, err)
-	}
-	mappings := &PolicyMappings{}
-
-	err = goyaml.Unmarshal(fileContents, mappings)
-	if err != nil {
-		return nil, fmt.Errorf("failed to unmarshal policy mapping file %s: %w", filename, err)
-	}
-	return mappings, nil
-}

pkg/config/types.go

@@ -1,48 +0,0 @@
-package config
-
-type PolicyMappings struct {
-	Version  string           `json:"version"`
-	Kind     string           `json:"kind"`
-	Policies []*PolicyMapping `json:"policies"`
-	Mirrors  []*PolicyMirror  `json:"mirrors"`
-}
-
-type AttestationStyle string
-
-const (
-	AttestationStyleAttached  AttestationStyle = "attached"
-	AttestationStyleReferrers AttestationStyle = "referrers"
-)
-
-type PolicyMapping struct {
-	Id           string              `json:"id"`
-	Description  string              `json:"description"`
-	Origin       *PolicyOrigin       `json:"origin"`
-	Files        []PolicyMappingFile `json:"files"`
-	Attestations *ReferrersConfig    `json:"attestations"`
-}
-
-type ReferrersConfig struct {
-	Style AttestationStyle `json:"style"`
-	Repo  string           `json:"repo"`
-}
-
-type PolicyMappingFile struct {
-	Path string `json:"path"`
-}
-
-type PolicyMirror struct {
-	PolicyId string     `yaml:"policy-id"`
-	Mirror   MirrorSpec `json:"mirror"`
-}
-
-type MirrorSpec struct {
-	Domains []string `json:"domains"`
-	Prefix  string   `json:"prefix"`
-}
-
-type PolicyOrigin struct {
-	Name   string `json:"name"`
-	Prefix string `json:"prefix"`
-	Domain string `json:"domain"`
-}

pkg/mirror/mirror.go

@@ -1,75 +0,0 @@
-package mirror
-
-import (
-	"fmt"
-	"os"
-
-	"github.com/docker/attest/internal/embed"
-	"github.com/docker/attest/pkg/oci"
-	"github.com/docker/attest/pkg/tuf"
-	"github.com/google/go-containerregistry/pkg/name"
-	v1 "github.com/google/go-containerregistry/pkg/v1"
-	"github.com/google/go-containerregistry/pkg/v1/empty"
-	"github.com/google/go-containerregistry/pkg/v1/layout"
-	"github.com/google/go-containerregistry/pkg/v1/remote"
-)
-
-func NewTufMirror(root []byte, tufPath, metadataURL, targetsURL string, versionChecker tuf.VersionChecker) (*TufMirror, error) {
-	if root == nil {
-		root = embed.DefaultRoot
-	}
-	tufClient, err := tuf.NewTufClient(root, tufPath, metadataURL, targetsURL, versionChecker)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create TUF client: %w", err)
-	}
-	return &TufMirror{TufClient: tufClient, tufPath: tufPath, metadataURL: metadataURL, targetsURL: targetsURL}, nil
-}
-
-func PushImageToRegistry(image v1.Image, imageName string) error {
-	ref, err := name.ParseReference(imageName)
-	if err != nil {
-		return fmt.Errorf("Failed to parse image name '%s': %w", imageName, err)
-	}
-
-	// Push the image to the registry
-	return remote.Write(ref, image, oci.MultiKeychainOption())
-}
-
-func PushIndexToRegistry(image v1.ImageIndex, imageName string) error {
-	// Parse the index name
-	ref, err := name.ParseReference(imageName)
-	if err != nil {
-		return fmt.Errorf("Failed to parse image name: %w", err)
-	}
-
-	// Push the index to the registry
-	return remote.WriteIndex(ref, image, oci.MultiKeychainOption())
-}
-
-func SaveImageAsOCILayout(image v1.Image, path string) error {
-	// Save the image to the local filesystem
-	err := os.MkdirAll(path, os.ModePerm)
-	if err != nil {
-		return fmt.Errorf("failed to create directory: %w", err)
-	}
-	index := empty.Index
-	l, err := layout.Write(path, index)
-	if err != nil {
-		return fmt.Errorf("failed to create index: %w", err)
-	}
-	return l.AppendImage(image)
-}
-
-func SaveIndexAsOCILayout(image v1.ImageIndex, path string) error {
-	// Save the index to the local filesystem
-	err := os.MkdirAll(path, os.ModePerm)
-	if err != nil {
-		return fmt.Errorf("failed to create directory: %w", err)
-	}
-
-	_, err = layout.Write(path, image)
-	if err != nil {
-		return fmt.Errorf("failed to create index: %w", err)
-	}
-	return nil
-}

pkg/oci/http.go

@@ -1,27 +0,0 @@
-package oci
-
-import (
-	"net/http"
-
-	"github.com/hashicorp/go-cleanhttp"
-)
-
-type userAgentTransporter struct {
-	ua string
-	rt http.RoundTripper
-}
-
-type Option = func(*http.Client)
-
-func (u *userAgentTransporter) RoundTrip(req *http.Request) (*http.Response, error) {
-	req.Header.Set("User-Agent", u.ua)
-
-	return u.rt.RoundTrip(req)
-}
-
-func HttpTransport() http.RoundTripper {
-	return &userAgentTransporter{
-		ua: "Docker-Client",
-		rt: cleanhttp.DefaultTransport(),
-	}
-}

pkg/oci/layout.go

@@ -1,151 +0,0 @@
-package oci
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"strings"
-
-	att "github.com/docker/attest/pkg/attestation"
-	v1 "github.com/google/go-containerregistry/pkg/v1"
-	"github.com/google/go-containerregistry/pkg/v1/layout"
-	"github.com/pkg/errors"
-)
-
-// implementation of AttestationResolver that closes over attestations from an oci layout
-type OCILayoutResolver struct {
-	*AttestationManifest
-	*ImageSpec
-}
-
-func NewOCILayoutAttestationResolver(src *ImageSpec) (*OCILayoutResolver, error) {
-	r := &OCILayoutResolver{
-		ImageSpec: src,
-	}
-	_, err := r.fetchAttestationManifest()
-	if err != nil {
-		return nil, err
-	}
-	return r, nil
-}
-
-func (r *OCILayoutResolver) fetchAttestationManifest() (*AttestationManifest, error) {
-	if r.AttestationManifest == nil {
-		m, err := attestationManifestFromOCILayout(r.Identifier, r.ImageSpec.Platform)
-		if err != nil {
-			return nil, err
-		}
-		r.AttestationManifest = m
-	}
-
-	return r.AttestationManifest, nil
-}
-
-func (r *OCILayoutResolver) Attestations(ctx context.Context, predicateType string) ([]*att.Envelope, error) {
-	attestationImage := r.AttestationManifest.Image
-	layers, err := attestationImage.Layers()
-	if err != nil {
-		return nil, fmt.Errorf("failed to extract layers from attestation image: %w", err)
-	}
-	var envs []*att.Envelope
-	manifest := r.AttestationManifest.Manifest
-	for i, l := range manifest.Layers {
-		if l.Annotations[InTotoPredicateType] != predicateType {
-			continue
-		}
-		layer := layers[i]
-		mt, err := layer.MediaType()
-		if err != nil {
-			return nil, fmt.Errorf("failed to get layer media type: %w", err)
-		}
-		mts := string(mt)
-		if !strings.HasSuffix(mts, "+dsse") {
-			continue
-		}
-		var env = new(att.Envelope)
-		// parse layer blob as json
-		r, err := layer.Uncompressed()
-
-		if err != nil {
-			return nil, fmt.Errorf("failed to get layer contents: %w", err)
-		}
-		defer r.Close()
-		err = json.NewDecoder(r).Decode(env)
-		if err != nil {
-			return nil, fmt.Errorf("failed to decode envelope: %w", err)
-		}
-		envs = append(envs, env)
-	}
-	return envs, nil
-}
-
-func (r *OCILayoutResolver) ImageName(ctx context.Context) (string, error) {
-	return r.Name, nil
-}
-
-func (r *OCILayoutResolver) ImageDigest(ctx context.Context) (string, error) {
-	return r.Digest, nil
-}
-
-func (r *OCILayoutResolver) ImagePlatform(ctx context.Context) (*v1.Platform, error) {
-	return r.ImageSpec.Platform, nil
-}
-
-func attestationManifestFromOCILayout(path string, platform *v1.Platform) (*AttestationManifest, error) {
-	idx, err := layout.ImageIndexFromPath(path)
-	if err != nil {
-		return nil, err
-	}
-
-	idxm, err := idx.IndexManifest()
-	if err != nil {
-		return nil, fmt.Errorf("failed to get digest: %w", err)
-	}
-
-	idxDescriptor := idxm.Manifests[0]
-	name := idxDescriptor.Annotations["org.opencontainers.image.ref.name"]
-	idxDigest := idxDescriptor.Digest
-
-	mfs, err := idx.ImageIndex(idxDigest)
-	if err != nil {
-		return nil, fmt.Errorf("failed to extract ImageIndex for digest %s: %w", idxDigest.String(), err)
-	}
-	mfs2, err := mfs.IndexManifest()
-	if err != nil {
-		return nil, fmt.Errorf("failed to extract IndexManifest from ImageIndex: %w", err)
-	}
-	var imageDigest string
-	for _, mf := range mfs2.Manifests {
-		if mf.Platform.Equals(*platform) {
-			imageDigest = mf.Digest.String()
-		}
-	}
-	for _, mf := range mfs2.Manifests {
-		if mf.Annotations[att.DockerReferenceType] != AttestationManifestType {
-			continue
-		}
-
-		if mf.Annotations[att.DockerReferenceDigest] != imageDigest {
-			continue
-		}
-
-		attestationImage, err := mfs.Image(mf.Digest)
-		if err != nil {
-			return nil, fmt.Errorf("failed to extract attestation image with digest %s: %w", mf.Digest.String(), err)
-		}
-		manifest, err := attestationImage.Manifest()
-		if err != nil {
-			return nil, fmt.Errorf("failed to get manifest: %w", err)
-		}
-		attest := &AttestationManifest{
-			Name:       name,
-			Image:      attestationImage,
-			Manifest:   manifest,
-			Descriptor: &mf,
-			Digest:     imageDigest,
-			Platform:   platform,
-		}
-		return attest, nil
-	}
-	return nil, errors.New("attestation manifest not found")
-}

pkg/oci/oci_test.go

@@ -1,108 +0,0 @@
-package oci
-
-import (
-	"path/filepath"
-	"testing"
-
-	"github.com/google/go-containerregistry/pkg/v1/layout"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-func TestRefToPurl(t *testing.T) {
-	arm, err := ParsePlatform("arm64/linux")
-	require.NoError(t, err)
-	purl, canonical, err := RefToPURL("alpine", arm)
-	assert.NoError(t, err)
-	assert.Equal(t, "pkg:docker/alpine@latest?platform=arm64%2Flinux", purl)
-	assert.False(t, canonical)
-
-	purl, canonical, err = RefToPURL("alpine:123", arm)
-	assert.NoError(t, err)
-	assert.Equal(t, "pkg:docker/alpine@123?platform=arm64%2Flinux", purl)
-	assert.False(t, canonical)
-
-	purl, canonical, err = RefToPURL("google/alpine:123", arm)
-	assert.NoError(t, err)
-	assert.Equal(t, "pkg:docker/google/alpine@123?platform=arm64%2Flinux", purl)
-	assert.False(t, canonical)
-
-	purl, canonical, err = RefToPURL("library/alpine:123", arm)
-	assert.NoError(t, err)
-	assert.Equal(t, "pkg:docker/alpine@123?platform=arm64%2Flinux", purl)
-	assert.False(t, canonical)
-
-	purl, canonical, err = RefToPURL("docker.io/library/alpine:123", arm)
-	assert.NoError(t, err)
-	assert.Equal(t, "pkg:docker/alpine@123?platform=arm64%2Flinux", purl)
-	assert.False(t, canonical)
-
-	purl, canonical, err = RefToPURL("localhost:5001/library/alpine:123", arm)
-	assert.NoError(t, err)
-	assert.Equal(t, "pkg:docker/localhost%3A5001/library/alpine@123?platform=arm64%2Flinux", purl)
-	assert.False(t, canonical)
-
-	purl, canonical, err = RefToPURL("localhost:5001/alpine:123", arm)
-	assert.NoError(t, err)
-	assert.Equal(t, "pkg:docker/localhost%3A5001/alpine@123?platform=arm64%2Flinux", purl)
-	assert.False(t, canonical)
-
-	purl, canonical, err = RefToPURL("localhost:5001/alpine@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b", arm)
-	assert.NoError(t, err)
-	assert.Equal(t, "pkg:docker/localhost%3A5001/alpine?digest=sha256%3Ac5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b&platform=arm64%2Flinux", purl)
-	assert.True(t, canonical)
-}
-
-var (
-	UnsignedTestImage = filepath.Join("..", "..", "test", "testdata", "unsigned-test-image")
-)
-
-// Test fix for https://github.com/docker/secure-artifacts-team-issues/issues/202
-func TestImageDigestForPlatform(t *testing.T) {
-	idx, err := layout.ImageIndexFromPath(UnsignedTestImage)
-	assert.NoError(t, err)
-
-	idxm, err := idx.IndexManifest()
-	assert.NoError(t, err)
-
-	idxDescriptor := idxm.Manifests[0]
-	idxDigest := idxDescriptor.Digest
-
-	mfs, err := idx.ImageIndex(idxDigest)
-	assert.NoError(t, err)
-	mfs2, err := mfs.IndexManifest()
-	assert.NoError(t, err)
-
-	p, err := ParsePlatform("linux/amd64")
-	assert.NoError(t, err)
-	digest, err := imageDigestForPlatform(mfs2, p)
-	assert.NoError(t, err)
-	assert.Equal(t, "sha256:da8b190665956ea07890a0273e2a9c96bfe291662f08e2860e868eef69c34620", digest)
-
-	p, err = ParsePlatform("linux/arm64")
-	assert.NoError(t, err)
-	digest, err = imageDigestForPlatform(mfs2, p)
-	assert.NoError(t, err)
-	assert.Equal(t, "sha256:7a76cec943853f9f7105b1976afa1bf7cd5bb6afc4e9d5852dd8da7cf81ae86e", digest)
-}
-
-func TestWithoutTag(t *testing.T) {
-	tc := []struct {
-		name     string
-		expected string
-	}{
-		{name: "image:tag", expected: "index.docker.io/library/image"},
-		{name: "image", expected: "index.docker.io/library/image"},
-		{name: "image:sha256-digest.att", expected: "index.docker.io/library/image"},
-		{name: "docker://image:tag", expected: "docker://index.docker.io/library/image"},
-		{name: "image@sha256:166710df254975d4a6c4c407c315951c22753dcaa829e020a3fd5d18fff70dd2", expected: "index.docker.io/library/image"},
-		{name: "docker://image@sha256:166710df254975d4a6c4c407c315951c22753dcaa829e020a3fd5d18fff70dd2", expected: "docker://index.docker.io/library/image"},
-		{name: "docker://127.0.0.1:36555/repo:latest", expected: "docker://127.0.0.1:36555/repo"},
-	}
-	for _, c := range tc {
-		t.Run(c.name, func(t *testing.T) {
-			notag, _ := WithoutTag(c.name)
-			assert.Equal(t, c.expected, notag)
-		})
-	}
-}

pkg/oci/referrers.go

@@ -1,121 +0,0 @@
-package oci
-
-import (
-	"context"
-	"fmt"
-
-	att "github.com/docker/attest/pkg/attestation"
-	"github.com/google/go-containerregistry/pkg/name"
-	"github.com/google/go-containerregistry/pkg/v1/remote"
-	"github.com/pkg/errors"
-)
-
-type ReferrersResolver struct {
-	digest        string
-	referrersRepo string
-	manifests     []*AttestationManifest
-	*RegistryImageDetailsResolver
-}
-
-func NewReferrersAttestationResolver(src *RegistryImageDetailsResolver, options ...func(*ReferrersResolver) error) (*ReferrersResolver, error) {
-	res := &ReferrersResolver{
-		RegistryImageDetailsResolver: src,
-	}
-	for _, opt := range options {
-		err := opt(res)
-		if err != nil {
-			return nil, err
-		}
-	}
-	return res, nil
-}
-
-func WithReferrersRepo(repo string) func(*ReferrersResolver) error {
-	return func(r *ReferrersResolver) error {
-		r.referrersRepo = repo
-		return nil
-	}
-}
-
-func (r *ReferrersResolver) resolveAttestations(ctx context.Context) error {
-	if r.manifests == nil {
-		subjectRef, err := name.ParseReference(r.Identifier)
-		if err != nil {
-			return fmt.Errorf("failed to parse reference: %w", err)
-		}
-		subjectDigest, err := r.ImageDigest(ctx)
-		if err != nil {
-			return fmt.Errorf("failed to get digest: %w", err)
-		}
-		var referrersSubjectRef name.Digest
-		if r.referrersRepo != "" {
-			referrersSubjectRef, err = name.NewDigest(fmt.Sprintf("%s@%s", r.referrersRepo, subjectDigest))
-			if err != nil {
-				return fmt.Errorf("failed to create referrers reference: %w", err)
-			}
-		} else {
-			referrersSubjectRef = subjectRef.Context().Digest(subjectDigest)
-		}
-		referrersIndex, err := remote.Referrers(referrersSubjectRef)
-		if err != nil {
-			return fmt.Errorf("failed to get referrers: %w", err)
-		}
-		referrersIndexManifest, err := referrersIndex.IndexManifest()
-		if err != nil {
-			return fmt.Errorf("failed to get index manifest: %w", err)
-		}
-		if len(referrersIndexManifest.Manifests) == 0 {
-			return errors.New("no referrers found")
-		}
-		aManifests := make([]*AttestationManifest, 0)
-		for _, m := range referrersIndexManifest.Manifests {
-
-			remoteRef := referrersSubjectRef.Context().Digest(m.Digest.String())
-			attestationImage, err := remote.Image(remoteRef)
-			if err != nil {
-				return fmt.Errorf("failed to get referred image: %w", err)
-			}
-			manifest, err := attestationImage.Manifest()
-			if err != nil {
-				return fmt.Errorf("failed to get manifest: %w", err)
-			}
-			if manifest.Annotations[att.DockerReferenceType] != AttestationManifestType {
-				continue
-			}
-			if manifest.Annotations[att.DockerReferenceDigest] != subjectDigest {
-				continue
-			}
-			attest := &AttestationManifest{
-				Name:       r.Identifier,
-				Image:      attestationImage,
-				Manifest:   manifest,
-				Descriptor: &m,
-				Digest:     subjectDigest,
-				Platform:   r.Platform,
-			}
-			aManifests = append(aManifests, attest)
-		}
-
-		if len(aManifests) == 0 {
-			return errors.New("no attestation manifests found")
-		}
-		r.manifests = aManifests
-	}
-	return nil
-}
-
-func (r *ReferrersResolver) Attestations(ctx context.Context, predicateType string) ([]*att.Envelope, error) {
-	err := r.resolveAttestations(ctx)
-	if err != nil {
-		return nil, fmt.Errorf("failed to resolve attestations: %w", err)
-	}
-	var envs []*att.Envelope
-	for _, attest := range r.manifests {
-		es, err := ExtractEnvelopes(attest, predicateType)
-		if err != nil {
-			return nil, fmt.Errorf("failed to extract envelopes: %w", err)
-		}
-		envs = append(envs, es...)
-	}
-	return envs, nil
-}

pkg/oci/registry.go

@@ -1,129 +0,0 @@
-package oci
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-
-	att "github.com/docker/attest/pkg/attestation"
-	"github.com/google/go-containerregistry/pkg/name"
-	v1 "github.com/google/go-containerregistry/pkg/v1"
-	"github.com/google/go-containerregistry/pkg/v1/remote"
-)
-
-type RegistryResolver struct {
-	*RegistryImageDetailsResolver
-	*AttestationManifest
-}
-
-type RegistryImageDetailsResolver struct {
-	*ImageSpec
-	digest string
-}
-
-func NewRegistryImageDetailsResolver(src *ImageSpec) (*RegistryImageDetailsResolver, error) {
-	return &RegistryImageDetailsResolver{
-		ImageSpec: src,
-	}, nil
-}
-
-func NewRegistryAttestationResolver(src *RegistryImageDetailsResolver) (*RegistryResolver, error) {
-	return &RegistryResolver{
-		RegistryImageDetailsResolver: src,
-	}, nil
-}
-
-func (r *RegistryImageDetailsResolver) ImageName(ctx context.Context) (string, error) {
-	return r.Identifier, nil
-}
-
-func (r *RegistryImageDetailsResolver) ImagePlatform(ctx context.Context) (*v1.Platform, error) {
-	return r.Platform, nil
-}
-
-func (r *RegistryImageDetailsResolver) ImageDigest(ctx context.Context) (string, error) {
-	if r.digest == "" {
-		subjectRef, err := name.ParseReference(r.Identifier)
-		if err != nil {
-			return "", fmt.Errorf("failed to parse reference: %w", err)
-		}
-		options := WithOptions(ctx, r.Platform)
-		desc, err := remote.Image(subjectRef, options...)
-		if err != nil {
-			return "", fmt.Errorf("failed to get image manifest: %w", err)
-		}
-		subjectDigest, err := desc.Digest()
-		if err != nil {
-			return "", fmt.Errorf("failed to get image digest: %w", err)
-		}
-		r.digest = subjectDigest.String()
-	}
-	return r.digest, nil
-}
-
-func (r *RegistryResolver) Attestations(ctx context.Context, predicateType string) ([]*att.Envelope, error) {
-	if r.AttestationManifest == nil {
-		attest, err := FetchAttestationManifest(ctx, r.Identifier, r.ImageSpec.Platform)
-		if err != nil {
-			return nil, err
-		}
-		r.AttestationManifest = attest
-	}
-	return ExtractEnvelopes(r.AttestationManifest, predicateType)
-}
-
-func FetchAttestationManifest(ctx context.Context, image string, platform *v1.Platform) (*AttestationManifest, error) {
-	// we want to get to the image index, so ignoring platform for now
-	options := WithOptions(ctx, nil)
-	ref, err := name.ParseReference(image)
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse reference: %w", err)
-	}
-	index, err := remote.Index(ref, options...)
-	if err != nil {
-		return nil, fmt.Errorf("failed to get index: %w", err)
-	}
-	indexManifest, err := index.IndexManifest()
-	if err != nil {
-		return nil, fmt.Errorf("failed to get index manifest: %w", err)
-	}
-	digest, err := imageDigestForPlatform(indexManifest, platform)
-	if err != nil {
-		return nil, fmt.Errorf("failed to obtain image for platform: %w", err)
-	}
-	ref, err = name.ParseReference(fmt.Sprintf("%s@%s", ref.Context().Name(), digest))
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse attestation reference: %w", err)
-	}
-
-	attestationDigest, err := attestationDigestForDigest(indexManifest, digest, "attestation-manifest")
-	if err != nil {
-		return nil, fmt.Errorf("failed to obtain attestation for image: %w", err)
-	}
-	ref, err = name.ParseReference(fmt.Sprintf("%s@%s", ref.Context().Name(), attestationDigest))
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse attestation reference: %w", err)
-	}
-	remoteDescriptor, err := remote.Get(ref, options...)
-	if err != nil {
-		return nil, fmt.Errorf("failed to get attestation: %w", err)
-	}
-	manifest := new(v1.Manifest)
-	err = json.Unmarshal(remoteDescriptor.Manifest, manifest)
-	if err != nil {
-		return nil, fmt.Errorf("failed to unmarshal attestation: %w", err)
-	}
-	attestationImage, err := remoteDescriptor.Image()
-	if err != nil {
-		return nil, fmt.Errorf("failed to get attestation image: %w", err)
-	}
-	attest := &AttestationManifest{
-		Name:       image,
-		Image:      attestationImage,
-		Manifest:   manifest,
-		Descriptor: &remoteDescriptor.Descriptor,
-		Digest:     digest,
-		Platform:   platform,
-	}
-	return attest, nil
-}

pkg/oci/registry_test.go

@@ -1,50 +0,0 @@
-package oci_test
-
-import (
-	"fmt"
-	"net/http/httptest"
-	"net/url"
-	"strings"
-	"testing"
-
-	"github.com/docker/attest/internal/test"
-	"github.com/docker/attest/pkg/attest"
-	"github.com/docker/attest/pkg/attestation"
-	"github.com/docker/attest/pkg/mirror"
-	"github.com/docker/attest/pkg/oci"
-	"github.com/docker/attest/pkg/policy"
-	"github.com/google/go-containerregistry/pkg/registry"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-func TestRegistry(t *testing.T) {
-	ctx, signer := test.Setup(t)
-	server := httptest.NewServer(registry.New(registry.WithReferrersSupport(false)))
-	defer server.Close()
-	u, err := url.Parse(server.URL)
-	require.NoError(t, err)
-
-	opts := &attestation.SigningOptions{
-		Replace:     true,
-		SkipSubject: true,
-	}
-	attIdx, err := oci.SubjectIndexFromPath(oci.UnsignedTestImage)
-	require.NoError(t, err)
-	signedIndex, err := attest.Sign(ctx, attIdx.Index, signer, opts)
-	require.NoError(t, err)
-
-	indexName := fmt.Sprintf("%s/repo:root", u.Host)
-	require.NoError(t, err)
-	err = mirror.PushIndexToRegistry(signedIndex, indexName)
-	require.NoError(t, err)
-
-	spec, err := oci.ParseImageSpec(indexName)
-	require.NoError(t, err)
-
-	resolver, err := policy.CreateImageDetailsResolver(spec)
-	require.NoError(t, err)
-	digest, err := resolver.ImageDigest(ctx)
-	require.NoError(t, err)
-	assert.True(t, strings.Contains(digest, "sha256:"))
-}

pkg/oci/resolver.go

@@ -1,54 +0,0 @@
-package oci
-
-import (
-	"context"
-
-	att "github.com/docker/attest/pkg/attestation"
-	v1 "github.com/google/go-containerregistry/pkg/v1"
-)
-
-type AttestationManifests struct {
-	Manifests []*AttestationManifest
-}
-
-type AttestationManifest struct {
-	// attestation image details
-	Image      v1.Image
-	Manifest   *v1.Manifest
-	Descriptor *v1.Descriptor
-	// details of subect image
-	Name     string
-	Digest   string
-	Platform *v1.Platform
-}
-
-type AttestationResolver interface {
-	ImageDetailsResolver
-	Attestations(ctx context.Context, mediaType string) ([]*att.Envelope, error)
-}
-
-type ImageDetailsResolver interface {
-	ImageName(ctx context.Context) (string, error)
-	ImagePlatform(ctx context.Context) (*v1.Platform, error)
-	ImageDigest(ctx context.Context) (string, error)
-}
-
-type MockResolver struct {
-	Envs []*att.Envelope
-}
-
-func (r MockResolver) Attestations(ctx context.Context, mediaType string) ([]*att.Envelope, error) {
-	return r.Envs, nil
-}
-
-func (r MockResolver) ImageName(ctx context.Context) (string, error) {
-	return "library/alpine:latest", nil
-}
-
-func (r MockResolver) ImageDigest(ctx context.Context) (string, error) {
-	return "sha256:test-digest", nil
-}
-
-func (r MockResolver) ImagePlatform(ctx context.Context) (*v1.Platform, error) {
-	return ParsePlatform("linux/amd64")
-}

pkg/policy/evaluator.go

@@ -1,30 +0,0 @@
-package policy
-
-import (
-	"context"
-	"fmt"
-
-	"github.com/docker/attest/pkg/oci"
-)
-
-type policyEvaluatorCtxKeyType struct{}
-
-var PolicyEvaluatorCtxKey policyEvaluatorCtxKeyType
-
-// sets PolicyEvaluator in context
-func WithPolicyEvaluator(ctx context.Context, pe PolicyEvaluator) context.Context {
-	return context.WithValue(ctx, PolicyEvaluatorCtxKey, pe)
-}
-
-// gets PolicyEvaluator from context, defaults to Rego PolicyEvaluator if not set
-func GetPolicyEvaluator(ctx context.Context) (PolicyEvaluator, error) {
-	t, ok := ctx.Value(PolicyEvaluatorCtxKey).(PolicyEvaluator)
-	if !ok {
-		return nil, fmt.Errorf("no policy evaluator client set on context (set one with policy.WithPolicyEvaluator)")
-	}
-	return t, nil
-}
-
-type PolicyEvaluator interface {
-	Evaluate(ctx context.Context, resolver oci.AttestationResolver, pctx *Policy, input *PolicyInput) (*Result, error)
-}

pkg/policy/mock.go

@@ -1,32 +0,0 @@
-package policy
-
-import (
-	"context"
-
-	"github.com/docker/attest/pkg/oci"
-)
-
-type MockPolicyEvaluator struct {
-	EvaluateFunc func(ctx context.Context, resolver oci.AttestationResolver, pctx *Policy, input *PolicyInput) (*Result, error)
-}
-
-func (pe *MockPolicyEvaluator) Evaluate(ctx context.Context, resolver oci.AttestationResolver, pctx *Policy, input *PolicyInput) (*Result, error) {
-	if pe.EvaluateFunc != nil {
-		return pe.EvaluateFunc(ctx, resolver, pctx, input)
-	}
-	return AllowedResult(), nil
-}
-
-func GetMockPolicy() PolicyEvaluator {
-	return &MockPolicyEvaluator{
-		EvaluateFunc: func(ctx context.Context, resolver oci.AttestationResolver, pctx *Policy, input *PolicyInput) (*Result, error) {
-			return AllowedResult(), nil
-		},
-	}
-}
-
-func AllowedResult() *Result {
-	return &Result{
-		Success: true,
-	}
-}

pkg/policy/policy.go

@@ -1,189 +0,0 @@
-package policy
-
-import (
-	"context"
-	"fmt"
-	"os"
-	"path"
-	"path/filepath"
-	"slices"
-	"strings"
-
-	"github.com/distribution/reference"
-	"github.com/docker/attest/pkg/config"
-	"github.com/docker/attest/pkg/oci"
-)
-
-func resolveLocalPolicy(opts *PolicyOptions, mapping *config.PolicyMapping) (*Policy, error) {
-	if opts.LocalPolicyDir == "" {
-		return nil, fmt.Errorf("local policy dir not set")
-	}
-	files := make([]*PolicyFile, 0, len(mapping.Files))
-	for _, f := range mapping.Files {
-		filename := f.Path
-		filePath := path.Join(opts.LocalPolicyDir, filename)
-		fileContents, err := os.ReadFile(filePath)
-		if err != nil {
-			return nil, fmt.Errorf("failed to read policy file %s: %w", filename, err)
-		}
-		files = append(files, &PolicyFile{
-			Path:    filename,
-			Content: fileContents,
-		})
-	}
-	policy := &Policy{
-		InputFiles: files,
-		Mapping:    mapping,
-	}
-	return policy, nil
-}
-
-func resolveTufPolicy(opts *PolicyOptions, mapping *config.PolicyMapping) (*Policy, error) {
-	files := make([]*PolicyFile, 0, len(mapping.Files))
-	for _, f := range mapping.Files {
-		filename := f.Path
-		_, fileContents, err := opts.TufClient.DownloadTarget(filename, filepath.Join(opts.LocalTargetsDir, filename))
-		if err != nil {
-			return nil, fmt.Errorf("failed to download policy file %s: %w", filename, err)
-		}
-		files = append(files, &PolicyFile{
-			Path:    filename,
-			Content: fileContents,
-		})
-	}
-	policy := &Policy{
-		InputFiles: files,
-		Mapping:    mapping,
-	}
-	return policy, nil
-}
-
-func findPolicyMatch(named reference.Named, mappings *config.PolicyMappings) (*config.PolicyMapping, *config.PolicyMirror) {
-	if mappings != nil {
-		for _, mapping := range mappings.Policies {
-			if mapping.Origin.Domain == reference.Domain(named) &&
-				strings.HasPrefix(reference.Path(named), mapping.Origin.Prefix) {
-				return mapping, nil
-			}
-		}
-		// now search mirrors
-		for _, mirror := range mappings.Mirrors {
-			if (slices.Contains(mirror.Mirror.Domains, reference.Domain(named)) ||
-				slices.Contains(mirror.Mirror.Domains, "*")) &&
-				strings.HasPrefix(reference.Path(named), mirror.Mirror.Prefix) {
-				for _, mapping := range mappings.Policies {
-					if mapping.Id == mirror.PolicyId {
-						return mapping, nil
-					}
-				}
-				return nil, mirror
-			}
-		}
-	}
-	return nil, nil
-}
-
-func resolvePolicyById(opts *PolicyOptions) (*Policy, error) {
-	if opts.PolicyId != "" {
-		localMappings, err := config.LoadLocalMappings(opts.LocalPolicyDir)
-		if err != nil {
-			return nil, fmt.Errorf("failed to load local policy mappings: %w", err)
-		}
-		if localMappings != nil {
-			for _, mapping := range localMappings.Policies {
-				if mapping.Id == opts.PolicyId {
-					return resolveLocalPolicy(opts, mapping)
-				}
-			}
-		}
-
-		// must check tuf
-		tufMappings, err := config.LoadTufMappings(opts.TufClient, opts.LocalTargetsDir)
-		if err != nil {
-			return nil, fmt.Errorf("failed to load tuf policy mappings by id: %w", err)
-		}
-		for _, mapping := range tufMappings.Policies {
-			if mapping.Id == opts.PolicyId {
-				return resolveTufPolicy(opts, mapping)
-			}
-		}
-		return nil, fmt.Errorf("policy with id %s not found", opts.PolicyId)
-	}
-	return nil, nil
-}
-
-func ResolvePolicy(ctx context.Context, detailsResolver oci.ImageDetailsResolver, opts *PolicyOptions) (*Policy, error) {
-	p, err := resolvePolicyById(opts)
-	if err != nil {
-		return nil, fmt.Errorf("failed to resolve policy by id: %w", err)
-	}
-	if p != nil {
-		return p, nil
-	}
-	imageName, err := detailsResolver.ImageName(ctx)
-	if err != nil {
-		return nil, fmt.Errorf("failed to get image name: %w", err)
-	}
-	named, err := reference.ParseNormalizedNamed(imageName)
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse image name: %w", err)
-	}
-	localMappings, err := config.LoadLocalMappings(opts.LocalPolicyDir)
-	if err != nil {
-		return nil, fmt.Errorf("failed to load local policy mappings: %w", err)
-	}
-	mapping, mirror := findPolicyMatch(named, localMappings)
-	if mapping != nil {
-		return resolveLocalPolicy(opts, mapping)
-	}
-	// must check tuf
-	tufMappings, err := config.LoadTufMappings(opts.TufClient, opts.LocalTargetsDir)
-	if err != nil {
-		return nil, fmt.Errorf("failed to load tuf policy mappings as fallback: %w", err)
-	}
-
-	// it's a mirror of a tuf policy
-	if mirror != nil {
-		for _, mapping := range tufMappings.Policies {
-			if mapping.Id == mirror.PolicyId {
-				return resolveTufPolicy(opts, mapping)
-			}
-		}
-	}
-
-	// try to resolve a tuf policy directly
-	mapping, _ = findPolicyMatch(named, tufMappings)
-	if mapping == nil {
-		return nil, nil
-	}
-	return resolveTufPolicy(opts, mapping)
-}
-
-func CreateImageDetailsResolver(imageSource *oci.ImageSpec) (oci.ImageDetailsResolver, error) {
-	switch imageSource.Type {
-	case oci.OCI:
-		return oci.NewOCILayoutAttestationResolver(imageSource)
-	case oci.Docker:
-		return oci.NewRegistryImageDetailsResolver(imageSource)
-	}
-	return nil, fmt.Errorf("unsupported image source type: %s", imageSource.Type)
-}
-
-func CreateAttestationResolver(resolver oci.ImageDetailsResolver, mapping *config.PolicyMapping) (oci.AttestationResolver, error) {
-	switch resolver := resolver.(type) {
-	case *oci.RegistryImageDetailsResolver:
-		if mapping.Attestations != nil && mapping.Attestations.Style == config.AttestationStyleAttached {
-			return oci.NewRegistryAttestationResolver(resolver)
-		} else {
-			if mapping.Attestations != nil && mapping.Attestations.Repo != "" {
-				return oci.NewReferrersAttestationResolver(resolver, oci.WithReferrersRepo(mapping.Attestations.Repo))
-			} else {
-				return oci.NewReferrersAttestationResolver(resolver)
-			}
-		}
-	case *oci.OCILayoutResolver:
-		return resolver, nil
-	default:
-		return nil, fmt.Errorf("unsupported image details resolver type: %T", resolver)
-	}
-}

pkg/policy/policy_test.go

@@ -1,114 +0,0 @@
-package policy_test
-
-import (
-	"encoding/json"
-	"os"
-	"path/filepath"
-	"testing"
-
-	"github.com/docker/attest/internal/test"
-	"github.com/docker/attest/pkg/attestation"
-	"github.com/docker/attest/pkg/config"
-	"github.com/docker/attest/pkg/oci"
-	"github.com/docker/attest/pkg/policy"
-	"github.com/docker/attest/pkg/tuf"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-func loadAttestation(t *testing.T, path string) *attestation.Envelope {
-	ex, err := os.ReadFile(path)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	var env = new(attestation.Envelope)
-	err = json.Unmarshal(ex, env)
-	if err != nil {
-		t.Fatal(err)
-	}
-	return env
-}
-
-func TestRegoEvaluator_Evaluate(t *testing.T) {
-	ctx, _ := test.Setup(t)
-	errorStr := "failed to resolve policy by id: policy with id non-existent-policy-id not found"
-	TestDataPath := filepath.Join("..", "..", "test", "testdata")
-	ExampleAttestation := filepath.Join(TestDataPath, "example_attestation.json")
-
-	re := policy.NewRegoEvaluator(true)
-
-	defaultResolver := oci.MockResolver{
-		Envs: []*attestation.Envelope{loadAttestation(t, ExampleAttestation)},
-	}
-
-	testCases := []struct {
-		repo          string
-		expectSuccess bool
-		isCanonical   bool
-		resolver      oci.AttestationResolver
-		policy        *policy.PolicyOptions
-		policyId      string
-		errorStr      string
-	}{
-		{repo: "testdata/mock-tuf-allow", expectSuccess: true, isCanonical: false, resolver: defaultResolver},
-		{repo: "testdata/mock-tuf-allow", expectSuccess: true, isCanonical: false, resolver: defaultResolver, policyId: "docker-official-images"},
-		{repo: "testdata/mock-tuf-allow", expectSuccess: false, isCanonical: false, resolver: defaultResolver, policyId: "non-existent-policy-id", errorStr: errorStr},
-		{repo: "testdata/mock-tuf-deny", expectSuccess: false, isCanonical: false, resolver: defaultResolver},
-		{repo: "testdata/mock-tuf-verify-sig", expectSuccess: true, isCanonical: false, resolver: defaultResolver},
-		{repo: "testdata/mock-tuf-wrong-key", expectSuccess: false, isCanonical: false, resolver: defaultResolver},
-		{repo: "testdata/mock-tuf-allow-canonical", expectSuccess: true, isCanonical: true, resolver: defaultResolver},
-		{repo: "testdata/mock-tuf-allow-canonical", expectSuccess: false, isCanonical: false, resolver: defaultResolver},
-	}
-
-	for _, tc := range testCases {
-		t.Run(tc.repo, func(t *testing.T) {
-			input := &policy.PolicyInput{
-				Digest:      "sha256:test-digest",
-				Purl:        "test-purl",
-				IsCanonical: tc.isCanonical,
-			}
-
-			tufClient := tuf.NewMockTufClient(tc.repo, test.CreateTempDir(t, "", "tuf-dest"))
-			if tc.policy == nil {
-				tc.policy = &policy.PolicyOptions{
-					TufClient:       tufClient,
-					LocalTargetsDir: test.CreateTempDir(t, "", "tuf-targets"),
-					PolicyId:        tc.policyId,
-				}
-			}
-			imageName, err := tc.resolver.ImageName(ctx)
-			require.NoError(t, err)
-			platform, err := tc.resolver.ImagePlatform(ctx)
-			require.NoError(t, err)
-			src, err := oci.ParseImageSpec(imageName, oci.WithPlatform(platform.String()))
-			require.NoError(t, err)
-			resolver, err := policy.CreateImageDetailsResolver(src)
-			policy, err := policy.ResolvePolicy(ctx, resolver, tc.policy)
-			if tc.errorStr != "" {
-				require.Error(t, err)
-				assert.Contains(t, err.Error(), tc.errorStr)
-				return
-			}
-			require.NoErrorf(t, err, "failed to resolve policy")
-			result, err := re.Evaluate(ctx, tc.resolver, policy, input)
-			require.NoErrorf(t, err, "Evaluate failed")
-
-			if tc.expectSuccess {
-				assert.True(t, result.Success, "Evaluate should have succeeded")
-			} else {
-				assert.False(t, result.Success, "Evaluate should have failed")
-			}
-		})
-	}
-
-}
-
-func TestLoadingMappings(t *testing.T) {
-	policyMappings, err := config.LoadLocalMappings(filepath.Join("testdata", "mock-tuf-allow"))
-	require.NoError(t, err)
-	assert.Equal(t, len(policyMappings.Mirrors), 1)
-	for _, mirror := range policyMappings.Mirrors {
-		assert.Equal(t, "docker-official-images", mirror.PolicyId)
-	}
-}

pkg/policy/testdata/mock-tuf-allow-canonical/doi/policy.rego

@@ -1,7 +0,0 @@
-package attest
-
-import rego.v1
-
-result := {
-  "success": input.isCanonical,
-}

pkg/policy/testdata/mock-tuf-allow-canonical/mapping.yaml

@@ -1,16 +0,0 @@
-# map repos to policies
-version: v1
-kind: policy-mapping
-policies:
-  - origin:
-      domain: docker.io
-      prefix: library/
-    id: docker-official-images
-    description: Docker Official Images
-    files:
-      - path: doi/policy.rego
-mirrors:
-  - policy-id: docker-official-images
-    mirror:
-      domains: [localhost:5001, registry.local:5000]
-      prefix: ""