141 lines
4.1 KiB
Go
141 lines
4.1 KiB
Go
package storage
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import (
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"encoding/json"
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"fmt"
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"github.com/docker/distribution"
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"github.com/docker/distribution/context"
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"github.com/docker/distribution/digest"
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"github.com/docker/distribution/manifest/schema1"
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"github.com/docker/distribution/reference"
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"github.com/docker/libtrust"
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)
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// signedManifestHandler is a ManifestHandler that covers schema1 manifests. It
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// can unmarshal and put schema1 manifests that have been signed by libtrust.
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type signedManifestHandler struct {
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repository distribution.Repository
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schema1SigningKey libtrust.PrivateKey
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blobStore distribution.BlobStore
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ctx context.Context
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}
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var _ ManifestHandler = &signedManifestHandler{}
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func (ms *signedManifestHandler) Unmarshal(ctx context.Context, dgst digest.Digest, content []byte) (distribution.Manifest, error) {
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context.GetLogger(ms.ctx).Debug("(*signedManifestHandler).Unmarshal")
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var (
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signatures [][]byte
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err error
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)
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jsig, err := libtrust.NewJSONSignature(content, signatures...)
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if err != nil {
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return nil, err
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}
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if ms.schema1SigningKey != nil {
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if err := jsig.Sign(ms.schema1SigningKey); err != nil {
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return nil, err
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}
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}
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// Extract the pretty JWS
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raw, err := jsig.PrettySignature("signatures")
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if err != nil {
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return nil, err
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}
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var sm schema1.SignedManifest
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if err := json.Unmarshal(raw, &sm); err != nil {
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return nil, err
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}
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return &sm, nil
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}
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func (ms *signedManifestHandler) Put(ctx context.Context, manifest distribution.Manifest, skipDependencyVerification bool) (digest.Digest, error) {
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context.GetLogger(ms.ctx).Debug("(*signedManifestHandler).Put")
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sm, ok := manifest.(*schema1.SignedManifest)
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if !ok {
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return "", fmt.Errorf("non-schema1 manifest put to signedManifestHandler: %T", manifest)
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}
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if err := ms.verifyManifest(ms.ctx, *sm, skipDependencyVerification); err != nil {
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return "", err
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}
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mt := schema1.MediaTypeManifest
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payload := sm.Canonical
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revision, err := ms.blobStore.Put(ctx, mt, payload)
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if err != nil {
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context.GetLogger(ctx).Errorf("error putting payload into blobstore: %v", err)
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return "", err
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}
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return revision.Digest, nil
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}
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// verifyManifest ensures that the manifest content is valid from the
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// perspective of the registry. It ensures that the signature is valid for the
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// enclosed payload. As a policy, the registry only tries to store valid
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// content, leaving trust policies of that content up to consumers.
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func (ms *signedManifestHandler) verifyManifest(ctx context.Context, mnfst schema1.SignedManifest, skipDependencyVerification bool) error {
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var errs distribution.ErrManifestVerification
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if len(mnfst.Name) > reference.NameTotalLengthMax {
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errs = append(errs,
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distribution.ErrManifestNameInvalid{
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Name: mnfst.Name,
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Reason: fmt.Errorf("manifest name must not be more than %v characters", reference.NameTotalLengthMax),
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})
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}
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if !reference.NameRegexp.MatchString(mnfst.Name) {
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errs = append(errs,
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distribution.ErrManifestNameInvalid{
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Name: mnfst.Name,
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Reason: fmt.Errorf("invalid manifest name format"),
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})
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}
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if len(mnfst.History) != len(mnfst.FSLayers) {
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errs = append(errs, fmt.Errorf("mismatched history and fslayer cardinality %d != %d",
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len(mnfst.History), len(mnfst.FSLayers)))
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}
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if _, err := schema1.Verify(&mnfst); err != nil {
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switch err {
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case libtrust.ErrMissingSignatureKey, libtrust.ErrInvalidJSONContent, libtrust.ErrMissingSignatureKey:
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errs = append(errs, distribution.ErrManifestUnverified{})
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default:
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if err.Error() == "invalid signature" { // TODO(stevvooe): This should be exported by libtrust
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errs = append(errs, distribution.ErrManifestUnverified{})
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} else {
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errs = append(errs, err)
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}
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}
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}
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if !skipDependencyVerification {
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for _, fsLayer := range mnfst.References() {
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_, err := ms.repository.Blobs(ctx).Stat(ctx, fsLayer.Digest)
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if err != nil {
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if err != distribution.ErrBlobUnknown {
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errs = append(errs, err)
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}
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// On error here, we always append unknown blob errors.
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errs = append(errs, distribution.ErrManifestBlobUnknown{Digest: fsLayer.Digest})
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}
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}
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}
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if len(errs) != 0 {
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return errs
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}
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return nil
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}
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