Add linting github action (#107 )

* Add golangci config * Add lint action
fix: add auth to referrers image retrieval (#108 )
2024-07-31 14:42:19 +01:00 · 2024-07-31 14:31:29 +01:00 · 2024-07-31 11:08:59 +01:00 · 2024-07-30 14:07:19 +01:00 · 2024-07-29 17:21:15 +01:00 · 2024-07-29 16:43:31 +01:00
14 changed files with 769 additions and 158 deletions
--- a/.github/workflows/lint.yml
+++ b/.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
--- a/.github/workflows/release.yml
+++ b/.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@31c86eb3b33c9b601a1f60f98dcbfd1d70f379b4 # v1.10.3
+        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 }}"}'
--- a/.golangci.yaml
+++ b/.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
--- a/CONTRIBUTING.md
+++ b/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.
--- a/README.md
+++ b/README.md
@@ -1,16 +1,372 @@
-# 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](./pkg/attest/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](./pkg/attest/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
+- `is_canonical` (bool): whether the image being verified was referenced by a 'canonical' name, i.e. one that contains a digest
+
+### 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/(.*)$"
+    rewrite: docker.io/library/$1
+```
+
+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"
+    },
+    "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.
--- a/go.mod
+++ b/go.mod
@@ -1,43 +1,41 @@
 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 v1.27.26
+	github.com/aws/aws-sdk-go-v2/config v1.27.27
 	github.com/awslabs/amazon-ecr-credential-helper/ecr-login v0.0.0-20231024185945-8841054dbdb8
 	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 v0.20.0
+	github.com/google/go-containerregistry v0.20.1
 	github.com/hashicorp/go-cleanhttp v0.5.2
 	github.com/in-toto/in-toto-golang v0.9.0
-	github.com/open-policy-agent/opa v0.66.0
+	github.com/open-policy-agent/opa v0.67.0
 	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 v2.3.0
 	github.com/sigstore/rekor v1.3.6
 	github.com/sigstore/sigstore/pkg/signature/kms/aws v1.8.7
 	github.com/sigstore/sigstore/pkg/signature/kms/gcp v1.8.7
 	github.com/stretchr/testify v1.9.0
 	github.com/testcontainers/testcontainers-go/modules/registry v0.32.0
 	github.com/theupdateframework/go-tuf/v2 v2.0.0
-	google.golang.org/api v0.188.0
-	gopkg.in/yaml.v3 v3.0.1
+	google.golang.org/api v0.189.0
 	sigs.k8s.io/yaml v1.4.0
 )

 // fork of a fork (in case it goes away) with changes to support ArtifactType (https://github.com/google/go-containerregistry/pull/1931)
-replace github.com/google/go-containerregistry v0.20.0 => github.com/kipz/go-containerregistry v0.0.0-20240722163910-ebe90246535d
+replace github.com/google/go-containerregistry => github.com/kipz/go-containerregistry v0.0.0-20240722163910-ebe90246535d

 require (
 	cloud.google.com/go v0.115.0 // indirect
-	cloud.google.com/go/auth v0.7.0 // indirect
-	cloud.google.com/go/auth/oauth2adapt v0.2.2 // indirect
-	cloud.google.com/go/compute/metadata v0.4.0 // indirect
+	cloud.google.com/go/auth v0.7.2 // indirect
+	cloud.google.com/go/auth/oauth2adapt v0.2.3 // indirect
+	cloud.google.com/go/compute/metadata v0.5.0 // indirect
 	cloud.google.com/go/iam v1.1.10 // indirect
 	cloud.google.com/go/kms v1.18.2 // indirect
 	cloud.google.com/go/longrunning v0.5.9 // indirect
@@ -50,7 +48,7 @@ require (
 	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 v1.30.3 // indirect
-	github.com/aws/aws-sdk-go-v2/credentials v1.17.26 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.17.27 // indirect
 	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.11 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.15 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.15 // indirect
@@ -60,7 +58,7 @@ require (
 	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.3 // indirect
 	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.17 // indirect
 	github.com/aws/aws-sdk-go-v2/service/kms v1.35.1 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sso v1.22.3 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.22.4 // indirect
 	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.26.4 // indirect
 	github.com/aws/aws-sdk-go-v2/service/sts v1.30.3 // indirect
 	github.com/aws/smithy-go v1.20.3 // indirect
@@ -69,7 +67,7 @@ require (
 	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/containerd v1.7.19 // indirect
+	github.com/containerd/containerd v1.7.20 // 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
@@ -105,13 +103,13 @@ require (
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/protobuf v1.5.4 // 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 v0.1.7 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/googleapis/enterprise-certificate-proxy v0.3.2 // indirect
 	github.com/googleapis/gax-go/v2 v2.12.5 // indirect
 	github.com/gorilla/mux v1.8.1 // indirect
-	github.com/hashicorp/go-retryablehttp v0.7.6 // 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
@@ -131,17 +129,19 @@ require (
 	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_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
@@ -149,7 +149,7 @@ require (
 	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 v1.8.6 // indirect
+	github.com/sigstore/sigstore v1.8.7 // 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
@@ -157,7 +157,7 @@ require (
 	github.com/spf13/cast v1.6.0 // 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
@@ -175,11 +175,11 @@ require (
 	go.mongodb.org/mongo-driver v1.15.0 // indirect
 	go.opencensus.io v0.24.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.52.0 // 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.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.53.0 // indirect
+	go.opentelemetry.io/otel v1.28.0 // indirect
+	go.opentelemetry.io/otel/metric v1.28.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.28.0 // indirect
+	go.opentelemetry.io/otel/trace v1.28.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/zap v1.27.0 // indirect
 	golang.org/x/crypto v0.25.0 // indirect
@@ -192,12 +192,13 @@ require (
 	golang.org/x/term v0.22.0 // indirect
 	golang.org/x/text v0.16.0 // indirect
 	golang.org/x/time v0.5.0 // indirect
-	google.golang.org/genproto v0.0.0-20240708141625-4ad9e859172b // indirect
+	google.golang.org/genproto v0.0.0-20240722135656-d784300faade // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20240701130421-f6361c86f094 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240708141625-4ad9e859172b // indirect
-	google.golang.org/grpc v1.64.1 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240722135656-d784300faade // indirect
+	google.golang.org/grpc v1.65.0 // 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
 	k8s.io/klog/v2 v2.120.1 // indirect
 )
--- a/go.sum
+++ b/go.sum
@@ -1,22 +1,22 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.115.0 h1:CnFSK6Xo3lDYRoBKEcAtia6VSC837/ZkJuRduSFnr14=
 cloud.google.com/go v0.115.0/go.mod h1:8jIM5vVgoAEoiVxQ/O4BFTfHqulPZgs/ufEzMcFMdWU=
-cloud.google.com/go/auth v0.7.0 h1:kf/x9B3WTbBUHkC+1VS8wwwli9TzhSt0vSTVBmMR8Ts=
-cloud.google.com/go/auth v0.7.0/go.mod h1:D+WqdrpcjmiCgWrXmLLxOVq1GACoE36chW6KXoEvuIw=
-cloud.google.com/go/auth/oauth2adapt v0.2.2 h1:+TTV8aXpjeChS9M+aTtN/TjdQnzJvmzKFt//oWu7HX4=
-cloud.google.com/go/auth/oauth2adapt v0.2.2/go.mod h1:wcYjgpZI9+Yu7LyYBg4pqSiaRkfEK3GQcpb7C/uyF1Q=
-cloud.google.com/go/compute/metadata v0.4.0 h1:vHzJCWaM4g8XIcm8kopr3XmDA4Gy/lblD3EhhSux05c=
-cloud.google.com/go/compute/metadata v0.4.0/go.mod h1:SIQh1Kkb4ZJ8zJ874fqVkslA29PRXuleyj6vOzlbK7M=
+cloud.google.com/go/auth v0.7.2 h1:uiha352VrCDMXg+yoBtaD0tUF4Kv9vrtrWPYXwutnDE=
+cloud.google.com/go/auth v0.7.2/go.mod h1:VEc4p5NNxycWQTMQEDQF0bd6aTMb6VgYDXEwiJJQAbs=
+cloud.google.com/go/auth/oauth2adapt v0.2.3 h1:MlxF+Pd3OmSudg/b1yZ5lJwoXCEaeedAguodky1PcKI=
+cloud.google.com/go/auth/oauth2adapt v0.2.3/go.mod h1:tMQXOfZzFuNuUxOypHlQEXgdfX5cuhwU+ffUuXRJE8I=
+cloud.google.com/go/compute/metadata v0.5.0 h1:Zr0eK8JbFv6+Wi4ilXAR8FJ3wyNdpxHKJNPos6LTZOY=
+cloud.google.com/go/compute/metadata v0.5.0/go.mod h1:aHnloV2TPI38yx4s9+wAZhHykWvVCfu7hQbF+9CWoiY=
 cloud.google.com/go/iam v1.1.10 h1:ZSAr64oEhQSClwBL670MsJAW5/RLiC6kfw3Bqmd5ZDI=
 cloud.google.com/go/iam v1.1.10/go.mod h1:iEgMq62sg8zx446GCaijmA2Miwg5o3UbO+nI47WHJps=
 cloud.google.com/go/kms v1.18.2 h1:EGgD0B9k9tOOkbPhYW1PHo2W0teamAUYMOUIcDRMfPk=
 cloud.google.com/go/kms v1.18.2/go.mod h1:YFz1LYrnGsXARuRePL729oINmN5J/5e7nYijgvfiIeY=
 cloud.google.com/go/longrunning v0.5.9 h1:haH9pAuXdPAMqHvzX0zlWQigXT7B0+CL4/2nXXdBo5k=
 cloud.google.com/go/longrunning v0.5.9/go.mod h1:HD+0l9/OOW0za6UWdKJtXoFAX/BGg/3Wj8p10NeWF7c=
-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=
+cuelabs.dev/go/oci/ociregistry v0.0.0-20240404174027-a39bec0462d2 h1:BnG6pr9TTr6CYlrJznYUDj6V7xldD1W+1iXPum0wT/w=
+cuelabs.dev/go/oci/ociregistry v0.0.0-20240404174027-a39bec0462d2/go.mod h1:pK23AUVXuNzzTpfMCA06sxZGeVQ/75FdVtW249de9Uo=
+cuelang.org/go v0.9.2 h1:pfNiry2PdRBr02G/aKm5k2vhzmqbAOoaB4WurmEbWvs=
+cuelang.org/go v0.9.2/go.mod h1:qpAYsLOf7gTM1YdEg6cxh553uZ4q9ZDWlPbtZr9q1Wk=
 dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
 dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
 filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
@@ -29,12 +29,12 @@ github.com/AliyunContainerService/ack-ram-tool/pkg/credentials/alibabacloudsdkgo
 github.com/AliyunContainerService/ack-ram-tool/pkg/credentials/alibabacloudsdkgo/helper v0.2.0/go.mod h1:GgeIE+1be8Ivm7Sh4RgwI42aTtC9qrcj+Y9Y6CjJhJs=
 github.com/Azure/azure-sdk-for-go v68.0.0+incompatible h1:fcYLmCpyNYRnvJbPerq7U0hS+6+I79yEDJBqVNcqUzU=
 github.com/Azure/azure-sdk-for-go v68.0.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
-github.com/Azure/azure-sdk-for-go/sdk/azcore v1.10.0 h1:n1DH8TPV4qqPTje2RcUBYwtrTWlabVp4n46+74X2pn4=
-github.com/Azure/azure-sdk-for-go/sdk/azcore v1.10.0/go.mod h1:HDcZnuGbiyppErN6lB+idp4CKhjbc8gwjto6OPpyggM=
-github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.5.1 h1:sO0/P7g68FrryJzljemN+6GTssUXdANk6aJ7T1ZxnsQ=
-github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.5.1/go.mod h1:h8hyGFDsU5HMivxiS2iYFZsgDbU9OnnJ163x5UGVKYo=
-github.com/Azure/azure-sdk-for-go/sdk/internal v1.5.2 h1:LqbJ/WzJUwBf8UiaSzgX7aMclParm9/5Vgp+TY51uBQ=
-github.com/Azure/azure-sdk-for-go/sdk/internal v1.5.2/go.mod h1:yInRyqWXAuaPrgI7p70+lDDgh3mlBohis29jGMISnmc=
+github.com/Azure/azure-sdk-for-go/sdk/azcore v1.12.0 h1:1nGuui+4POelzDwI7RG56yfQJHCnKvwfMoU7VsEp+Zg=
+github.com/Azure/azure-sdk-for-go/sdk/azcore v1.12.0/go.mod h1:99EvauvlcJ1U06amZiksfYz/3aFGyIhWGHVyiZXtBAI=
+github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.7.0 h1:tfLQ34V6F7tVSwoTf/4lH5sE0o6eCJuNDTmH09nDpbc=
+github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.7.0/go.mod h1:9kIvujWAA58nmPmWB1m23fyWic1kYZMxD9CxaWn4Qpg=
+github.com/Azure/azure-sdk-for-go/sdk/internal v1.9.0 h1:H+U3Gk9zY56G3u872L82bk4thcsy2Gghb9ExT4Zvm1o=
+github.com/Azure/azure-sdk-for-go/sdk/internal v1.9.0/go.mod h1:mgrmMSgaLp9hmax62XQTd0N4aAqSE5E0DulSpVYK7vc=
 github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/azkeys v1.1.0 h1:DRiANoJTiW6obBQe3SqZizkuV1PEgfiiGivmVocDy64=
 github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/azkeys v1.1.0/go.mod h1:qLIye2hwb/ZouqhpSD9Zn3SJipvpEnz1Ywl3VUk9Y0s=
 github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/internal v1.0.0 h1:D3occbWoio4EBLkbkevetNMAVX197GkzbUMtqjGWn80=
@@ -102,14 +102,14 @@ github.com/arbovm/levenshtein v0.0.0-20160628152529-48b4e1c0c4d0 h1:jfIu9sQUG6Ig
 github.com/arbovm/levenshtein v0.0.0-20160628152529-48b4e1c0c4d0/go.mod h1:t2tdKJDJF9BV14lnkjHmOQgcvEKgtqs5a1N3LNdJhGE=
 github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 h1:DklsrG3dyBCFEj5IhUbnKptjxatkF07cF2ak3yi77so=
 github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=
-github.com/aws/aws-sdk-go v1.54.16 h1:+B9zGaVwOUU6AO9Sy99VjTMDPthWx10HjB08hjaBHIc=
-github.com/aws/aws-sdk-go v1.54.16/go.mod h1:eRwEWoyTWFMVYVQzKMNHWP5/RV4xIUGMQfXQHfHkpNU=
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@@ -128,8 +128,8 @@ github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.17 h1:HGErhhrx
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@@ -142,12 +142,14 @@ github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
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@@ -178,16 +180,16 @@ github.com/codahale/rfc6979 v0.0.0-20141003034818-6a90f24967eb h1:EDmT6Q9Zs+SbUo
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@@ -305,8 +307,8 @@ github.com/golang-jwt/jwt/v4 v4.5.0/go.mod h1:m21LjoU+eqJr34lmDMbreY2eSTRJ1cv77w
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@@ -327,8 +329,8 @@ github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek
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@@ -377,8 +379,8 @@ github.com/hashicorp/go-hclog v1.6.3 h1:Qr2kF+eVWjTiYmU7Y31tYlP1h0q/X3Nl3tPGdaB1
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@@ -389,8 +391,8 @@ github.com/hashicorp/go-sockaddr v1.0.5 h1:dvk7TIXCZpmfOlM+9mlcrWmWjw/wlKT+VDq2w
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@@ -491,8 +493,8 @@ github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1y
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@@ -520,10 +522,10 @@ github.com/prometheus/client_golang v1.19.1/go.mod h1:mP78NwGzrVks5S2H6ab8+ZZGJL
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@@ -553,22 +555,22 @@ github.com/shoenig/go-m1cpu v0.1.6 h1:nxdKQNcEB6vzgA2E2bvzKIYRuNj7XNJ4S/aRSwKzFt
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@@ -585,10 +587,10 @@ github.com/spf13/cobra v1.8.1 h1:e5/vxKd/rZsfSJMUX1agtjeTDf+qv1/JdBF8gg5k9ZM=
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@@ -633,8 +635,8 @@ github.com/transparency-dev/merkle v0.0.2 h1:Q9nBoQcZcgPamMkGn7ghV8XiTZ/kRxn1yCG
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@@ -656,26 +658,26 @@ go.opencensus.io v0.24.0 h1:y73uSU6J157QMP2kn2r30vwW1A2W2WFwSCGnAVxeaD0=
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@@ -803,26 +805,26 @@ golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8T
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 google.golang.org/genproto/googleapis/api v0.0.0-20240701130421-f6361c86f094 h1:0+ozOGcrp+Y8Aq8TLNN2Aliibms5LEzsq99ZZmAGYm0=
 google.golang.org/genproto/googleapis/api v0.0.0-20240701130421-f6361c86f094/go.mod h1:fJ/e3If/Q67Mj99hin0hMhiNyCRmt6BQ2aWIJshUSJw=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20240708141625-4ad9e859172b h1:04+jVzTs2XBnOZcPsLnmrTGqltqJbZQ1Ey26hjYdQQ0=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20240708141625-4ad9e859172b/go.mod h1:Ue6ibwXGpU+dqIcODieyLOcgj7z8+IcskoNIgZxtrFY=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240722135656-d784300faade h1:oCRSWfwGXQsqlVdErcyTt4A93Y8fo0/9D4b1gnI++qo=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240722135656-d784300faade/go.mod h1:Ue6ibwXGpU+dqIcODieyLOcgj7z8+IcskoNIgZxtrFY=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
 google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
-google.golang.org/grpc v1.64.1 h1:LKtvyfbX3UGVPFcGqJ9ItpVWW6oN/2XqTxfAnwRRXiA=
-google.golang.org/grpc v1.64.1/go.mod h1:hiQF4LFZelK2WKaP6W0L92zGHtiQdZxk8CrSdvyjeP0=
+google.golang.org/grpc v1.65.0 h1:bs/cUb4lp1G5iImFFd3u5ixQzweKizoZJAwBNLR42lc=
+google.golang.org/grpc v1.65.0/go.mod h1:WgYC2ypjlB0EiQi6wdKixMqukr6lBc0Vo+oOgjrM5ZQ=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@@ -869,12 +871,12 @@ 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=
+k8s.io/utils v0.0.0-20240502163921-fe8a2dddb1d0 h1:jgGTlFYnhF1PM1Ax/lAlxUPE+KfCIXHaathvJg1C3ak=
+k8s.io/utils v0.0.0-20240502163921-fe8a2dddb1d0/go.mod h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0=
 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=
-sigs.k8s.io/release-utils v0.7.7/go.mod h1:iU7DGVNi3umZJ8q6aHyUFzsDUIaYwNnNKGHo3YE5E3s=
+sigs.k8s.io/release-utils v0.8.3 h1:KtOtA4qDmzJyeQ2zkDsFVI25+NViwms/o5eL2NftFdA=
+sigs.k8s.io/release-utils v0.8.3/go.mod h1:fp82Fma06OXBhEJ+GUJKqvcplDBomruK1R/1fWJnsrQ=
 sigs.k8s.io/structured-merge-diff/v4 v4.3.0 h1:UZbZAZfX0wV2zr7YZorDz6GXROfDFj6LvqCRm4VUVKk=
 sigs.k8s.io/structured-merge-diff/v4 v4.3.0/go.mod h1:N8hJocpFajUSSeSJ9bOZ77VzejKZaXsTtZo4/u7Io08=
 sigs.k8s.io/yaml v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E=
--- a/pkg/attest/example_verify_test.go
+++ b/pkg/attest/example_verify_test.go
@@ -48,11 +48,11 @@ func ExampleVerify_remote() {
 		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)
 	}
+	// verify attestations
 	result, err := attest.Verify(context.Background(), src, opts)
 	if err != nil {
 		panic(err)
--- a/pkg/attestation/example_attestation_manifest_test.go
+++ b/pkg/attestation/example_attestation_manifest_test.go
@@ -0,0 +1,87 @@
+package attestation_test
+
+import (
+	"context"
+	"time"
+
+	"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"
+	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 ExampleAttestationManifest() {
+	// 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{
+		SkipTL: true, // skip trust logging 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 := attest.NewAttestationManifest(desc)
+	if err != nil {
+		panic(err)
+	}
+
+	// sign and add the attestation to the manifest
+	err = manifest.AddAttestation(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
+	err = mirror.SaveReferrers(manifest, output)
+	if err != nil {
+		panic(err)
+	}
+}
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -7,7 +7,7 @@ import (
 	"regexp"

 	"github.com/docker/attest/pkg/tuf"
-	goyaml "gopkg.in/yaml.v3"
+	"sigs.k8s.io/yaml"
 )

 const (
@@ -24,7 +24,7 @@ func LoadLocalMappings(configDir string) (*PolicyMappings, error) {
 	if err != nil {
 		return nil, fmt.Errorf("failed to read local policy mapping file %s: %w", path, err)
 	}
-	err = goyaml.Unmarshal(mappingFile, mappings)
+	err = yaml.Unmarshal(mappingFile, mappings)
 	if err != nil {
 		return nil, fmt.Errorf("failed to unmarshal policy mapping file %s: %w", path, err)
 	}
@@ -42,7 +42,7 @@ func LoadTufMappings(tufClient tuf.TUFClient, localTargetsDir string) (*PolicyMa
 	}
 	mappings := &policyMappingsFile{}

-	err = goyaml.Unmarshal(fileContents, mappings)
+	err = yaml.Unmarshal(fileContents, mappings)
 	if err != nil {
 		return nil, fmt.Errorf("failed to unmarshal policy mapping file %s: %w", filename, err)
 	}
--- a/pkg/config/types.go
+++ b/pkg/config/types.go
@@ -1,18 +1,20 @@
 package config

-import "regexp"
+import (
+	"regexp"
+)

 type policyMappingsFile struct {
-	Version  string            `yaml:"version"`
-	Kind     string            `yaml:"kind"`
-	Policies []*PolicyMapping  `yaml:"policies"`
-	Rules    []*policyRuleFile `yaml:"rules"`
+	Version  string            `json:"version"`
+	Kind     string            `json:"kind"`
+	Policies []*PolicyMapping  `json:"policies"`
+	Rules    []*policyRuleFile `json:"rules"`
 }

 type policyRuleFile struct {
-	Pattern     string `yaml:"pattern"`
-	PolicyId    string `yaml:"policy-id"`
-	Replacement string `yaml:"rewrite"`
+	Pattern     string `json:"pattern"`
+	PolicyId    string `json:"policy-id"`
+	Replacement string `json:"rewrite"`
 }

 type PolicyMappings struct {
@@ -30,19 +32,19 @@ const (
 )

 type PolicyMapping struct {
-	Id           string              `yaml:"id"`
-	Description  string              `yaml:"description"`
-	Files        []PolicyMappingFile `yaml:"files"`
-	Attestations *AttestationConfig  `yaml:"attestations"`
+	Id           string              `json:"id"`
+	Description  string              `json:"description"`
+	Files        []PolicyMappingFile `json:"files"`
+	Attestations *AttestationConfig  `json:"attestations"`
 }

 type AttestationConfig struct {
-	Style AttestationStyle `yaml:"style"`
-	Repo  string           `yaml:"repo"`
+	Style AttestationStyle `json:"style"`
+	Repo  string           `json:"repo"`
 }

 type PolicyMappingFile struct {
-	Path string `yaml:"path"`
+	Path string `json:"path"`
 }

 type PolicyRule struct {
--- a/pkg/oci/layout.go
+++ b/pkg/oci/layout.go
@@ -9,7 +9,6 @@ import (
 	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
@@ -140,5 +139,5 @@ func attestationManifestFromOCILayout(path string, platform *v1.Platform) (*atte
 		}
 		return attest, nil
 	}
-	return nil, errors.New("attestation manifest not found")
+	return nil, fmt.Errorf("attestation manifest not found")
 }
--- a/pkg/oci/oci.go
+++ b/pkg/oci/oci.go
@@ -15,7 +15,6 @@ import (
 	"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
@@ -82,7 +81,7 @@ func imageDescriptor(ix *v1.IndexManifest, platform *v1.Platform) (*v1.Descripto
 			return &m, nil
 		}
 	}
-	return nil, 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) {
@@ -93,7 +92,7 @@ func attestationDigestForDigest(ix *v1.IndexManifest, imageDigest string, attest
 			}
 		}
 	}
-	return "", errors.New(fmt.Sprintf("no attestation found for image %s", imageDigest))
+	return "", fmt.Errorf("no attestation found for image %s", imageDigest)
 }

 func RefToPURL(ref string, platform *v1.Platform) (string, bool, error) {
--- a/pkg/oci/referrers.go
+++ b/pkg/oci/referrers.go
@@ -79,7 +79,8 @@ func (r *ReferrersResolver) resolveAttestations(ctx context.Context, predicateTy
 	aManifests := make([]*attestation.AttestationManifest, 0)
 	for _, m := range referrersIndexManifest.Manifests {
 		remoteRef := referrersSubjectRef.Context().Digest(m.Digest.String())
-		attestationImage, err := remote.Image(remoteRef)
+		options = WithOptions(ctx, nil)
+		attestationImage, err := remote.Image(remoteRef, options...)
 		if err != nil {
 			return nil, fmt.Errorf("failed to get referred image: %w", err)
 		}
Author	SHA1	Message	Date
Jonny Stoten	fbe9a0c726	Add linting github action (#107 ) * Add golangci config * Add lint action	2024-07-31 14:42:19 +01:00
James Carnegie	9571f17476	fix: add auth to referrers image retrieval (#108 )	2024-07-31 14:31:29 +01:00
James Carnegie	63246e2b96	docs: add contribution guidelines (#102 ) * docs: add contribution guidelines	2024-07-31 11:08:59 +01:00
Jonny Stoten	91fdf7ece6	Remove dependency on github.com/pkg/errors (#106 )	2024-07-30 14:07:19 +01:00
James Carnegie	a1c7bbb991	debt: remove goyaml. Fixup directives (#103 )	2024-07-29 17:21:15 +01:00
Jonny Stoten	2ffdfdf0eb	docs: first cut of a new README (#99 ) Lots of this is taken from image-signer-verifier's README. The stuff on policy is all new. Co-authored-by: James Carnegie <kipz@users.noreply.github.com>	2024-07-29 16:43:31 +01:00
dependabot[bot]	781a738b54	feat(deps): bump github.com/open-policy-agent/opa from 0.66.0 to 0.67.0 (#101 ) Bumps [github.com/open-policy-agent/opa](https://github.com/open-policy-agent/opa) from 0.66.0 to 0.67.0. - [Release notes](https://github.com/open-policy-agent/opa/releases) - [Changelog](https://github.com/open-policy-agent/opa/blob/main/CHANGELOG.md) - [Commits](https://github.com/open-policy-agent/opa/compare/v0.66.0...v0.67.0) --- updated-dependencies: - dependency-name: github.com/open-policy-agent/opa dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>	2024-07-26 09:46:59 +01:00
James Carnegie	c735bb0d3f	feat: roll out updates on release (#100 ) * feat: roll out updates on release * Use app token. Fix repo	2024-07-25 16:15:35 +01:00
dependabot[bot]	bd2c4d7d8a	feat(deps): bump github.com/sigstore/cosign/v2 from 2.2.4 to 2.3.0 (#98 ) * feat(deps): bump github.com/sigstore/cosign/v2 from 2.2.4 to 2.3.0 Bumps [github.com/sigstore/cosign/v2](https://github.com/sigstore/cosign) from 2.2.4 to 2.3.0. - [Release notes](https://github.com/sigstore/cosign/releases) - [Changelog](https://github.com/sigstore/cosign/blob/main/CHANGELOG.md) - [Commits](https://github.com/sigstore/cosign/compare/v2.2.4...v2.3.0) --- updated-dependencies: - dependency-name: github.com/sigstore/cosign/v2 dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com> * update to go 1.22.5 --------- Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: mrjoelkamp <joel.kamp@docker.com>	2024-07-24 13:30:56 +01:00
dependabot[bot]	03ba59c6b9	feat(deps): bump google.golang.org/api from 0.188.0 to 0.189.0 (#97 )	2024-07-23 19:08:01 +00:00
dependabot[bot]	ac82c65d7c	feat(deps): bump github.com/aws/aws-sdk-go-v2/config (#93 )	2024-07-23 19:03:53 +00:00