101 lines
2.6 KiB
Go
101 lines
2.6 KiB
Go
package handler
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import (
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"path/filepath"
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"runtime/debug"
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"github.com/docker/attest/pkg/attest"
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"github.com/docker/attest/pkg/oci"
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"github.com/docker/attest/pkg/policy"
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intoto "github.com/in-toto/in-toto-golang/in_toto"
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"github.com/open-policy-agent/frameworks/constraint/pkg/externaldata"
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"github.com/open-policy-agent/gatekeeper-external-data-provider/pkg/utils"
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"k8s.io/klog/v2"
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)
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type ValidationResult struct {
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Outcome attest.Outcome `json:"outcome"`
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Input *policy.PolicyInput `json:"input"`
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VSA *intoto.Statement `json:"vsa"`
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Violations []policy.Violation `json:"violations"`
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}
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func Validate() http.Handler {
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return http.HandlerFunc(validate)
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}
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func validate(w http.ResponseWriter, req *http.Request) {
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defer func() {
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if r := recover(); r != nil {
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klog.Error(string(debug.Stack()))
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klog.ErrorS(fmt.Errorf("%v", r), "panic occurred")
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}
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}()
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// read request body
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requestBody, err := io.ReadAll(req.Body)
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if err != nil {
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utils.SendResponse(nil, fmt.Sprintf("unable to read request body: %v", err), w)
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return
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}
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klog.InfoS("received request", "body", requestBody)
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// parse request body
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var providerRequest externaldata.ProviderRequest
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err = json.Unmarshal(requestBody, &providerRequest)
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if err != nil {
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utils.SendResponse(nil, fmt.Sprintf("unable to unmarshal request body: %v", err), w)
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return
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}
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results := make([]externaldata.Item, 0)
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// create a tuf client
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tufOutputPath := filepath.Join("/tuf_temp", ".docker", "tuf")
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tufClient, err := createTufClient(tufOutputPath)
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if err != nil {
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utils.SendResponse(nil, err.Error(), w)
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return
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}
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for _, key := range providerRequest.Request.Keys {
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platform := "linux/amd64"
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src, err := oci.ParseImageSpec(key, oci.WithPlatform(platform))
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if err != nil {
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utils.SendResponse(nil, err.Error(), w)
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return
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}
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opts := &policy.PolicyOptions{
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TufClient: tufClient,
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LocalTargetsDir: filepath.Join("/tuf_temp", ".docker", "policy"), // location to store policy files downloaded from TUF
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LocalPolicyDir: "", // overrides TUF policy for local policy files if set
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}
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ctx := req.Context()
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debug := true
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ctx = policy.WithPolicyEvaluator(ctx, policy.NewRegoEvaluator(debug))
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result, err := attest.Verify(ctx, src, opts)
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if err != nil {
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utils.SendResponse(nil, err.Error(), w)
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return
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}
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results = append(results, externaldata.Item{
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Key: key,
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Value: ValidationResult{
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Outcome: result.Outcome,
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Input: result.Input,
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VSA: result.VSA,
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Violations: result.Violations,
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},
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})
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}
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utils.SendResponse(&results, "", w)
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}
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