// verifyManifest ensures that the manifest content is valid from the
// perspective of the registry. It ensures that the signature is valid for the
// enclosed payload. As a policy, the registry only tries to store valid
// content, leaving trust policies of that content up to consumers.
func (ms *signedManifestHandler) verifyManifest(ctx context.Context, mnfst schema1.SignedManifest, skipDependencyVerification bool) error {
var errs distribution.ErrManifestVerification
if len(mnfst.Name) > reference.NameTotalLengthMax {
errs = append(errs,
distribution.ErrManifestNameInvalid{
Name: mnfst.Name,
Reason: fmt.Errorf("manifest name must not be more than %v characters", reference.NameTotalLengthMax),
})
}
if !reference.NameRegexp.MatchString(mnfst.Name) {
errs = append(errs,
distribution.ErrManifestNameInvalid{
Name: mnfst.Name,
Reason: fmt.Errorf("invalid manifest name format"),
})
}
if len(mnfst.History) != len(mnfst.FSLayers) {
errs = append(errs, fmt.Errorf("mismatched history and fslayer cardinality %d != %d",
len(mnfst.History), len(mnfst.FSLayers)))
}
if _, err := schema1.Verify(&mnfst); err != nil {
switch err {
case libtrust.ErrMissingSignatureKey, libtrust.ErrInvalidJSONContent, libtrust.ErrMissingSignatureKey:
errs = append(errs, distribution.ErrManifestUnverified{})
default:
if err.Error() == "invalid signature" { // TODO(stevvooe): This should be exported by libtrust
errs = append(errs, distribution.ErrManifestUnverified{})
} else {
errs = append(errs, err)
}
}
}
if !skipDependencyVerification {
for _, fsLayer := range mnfst.References() {
_, err := ms.repository.Blobs(ctx).Stat(ctx, fsLayer.Digest)
if err != nil {
if err != distribution.ErrBlobUnknown {
errs = append(errs, err)
}
// On error here, we always append unknown blob errors.
errs = append(errs, distribution.ErrManifestBlobUnknown{Digest: fsLayer.Digest})
}
}
}
if len(errs) != 0 {
return errs
}
return nil
}
// signedManifestFillImageMetadata fills a given image with metadata. It also corrects layer sizes with blob sizes. Newer
// Docker client versions don't set layer sizes in the manifest at all. Origin master needs correct layer
// sizes for proper image quota support. That's why we need to fill the metadata in the registry.
func (r *repository) signedManifestFillImageMetadata(manifest *schema1.SignedManifest, image *imageapi.Image) error {
signatures, err := manifest.Signatures()
if err != nil {
return err
}
for _, signDigest := range signatures {
image.DockerImageSignatures = append(image.DockerImageSignatures, signDigest)
}
if err := imageapi.ImageWithMetadata(image); err != nil {
return err
}
refs := manifest.References()
blobSet := sets.NewString()
image.DockerImageMetadata.Size = int64(0)
blobs := r.Blobs(r.ctx)
for i := range image.DockerImageLayers {
layer := &image.DockerImageLayers[i]
// DockerImageLayers represents manifest.Manifest.FSLayers in reversed order
desc, err := blobs.Stat(r.ctx, refs[len(image.DockerImageLayers)-i-1].Digest)
if err != nil {
context.GetLogger(r.ctx).Errorf("failed to stat blobs %s of image %s", layer.Name, image.DockerImageReference)
return err
}
if layer.MediaType == "" {
if desc.MediaType != "" {
layer.MediaType = desc.MediaType
} else {
layer.MediaType = schema1.MediaTypeManifestLayer
}
}
layer.LayerSize = desc.Size
// count empty layer just once (empty layer may actually have non-zero size)
if !blobSet.Has(layer.Name) {
image.DockerImageMetadata.Size += desc.Size
blobSet.Insert(layer.Name)
}
}
if len(image.DockerImageConfig) > 0 && !blobSet.Has(image.DockerImageMetadata.ID) {
blobSet.Insert(image.DockerImageMetadata.ID)
image.DockerImageMetadata.Size += int64(len(image.DockerImageConfig))
}
return nil
}