Verify manifest before accepting

pkg/dockerregistry/server/blobdescriptorservice_test.go

@@ -90,7 +90,7 @@ func TestBlobDescriptorServiceIsApplied(t *testing.T) {
 	}
 	os.Setenv("DOCKER_REGISTRY_URL", serverURL.Host)
 
-	desc, _, err := registrytest.UploadTestBlob(serverURL, "user/app")
+	desc, _, err := registrytest.UploadTestBlob(serverURL, nil, "user/app")
 	if err != nil {
 		t.Fatal(err)
 	}

pkg/dockerregistry/server/manifesthandler.go

@@ -0,0 +1,66 @@
+package server
+
+import (
+	"fmt"
+
+	"github.com/docker/distribution"
+	"github.com/docker/distribution/context"
+	"github.com/docker/distribution/manifest/schema1"
+	"github.com/docker/distribution/manifest/schema2"
+
+	imageapi "github.com/openshift/origin/pkg/image/api"
+)
+
+// A ManifestHandler defines a common set of operations on all versions of manifest schema.
+type ManifestHandler interface {
+	// FillImageMetadata fills a given image with metadata parsed from manifest. It also corrects layer sizes
+	// with blob sizes. Newer Docker client versions don't set layer sizes in the manifest schema 1 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.
+	FillImageMetadata(ctx context.Context, image *imageapi.Image) error
+
+	// Manifest returns a deserialized manifest object.
+	Manifest() distribution.Manifest
+
+	// Payload returns manifest's media type, complete payload with signatures and canonical payload without
+	// signatures or an error if the information could not be fetched.
+	Payload() (mediaType string, payload []byte, canonical []byte, err error)
+
+	// Verify returns an error if the contained manifest is not valid or has missing dependencies.
+	Verify(ctx context.Context, skipDependencyVerification bool) error
+}
+
+// NewManifestHandler creates a manifest handler for the given manifest.
+func NewManifestHandler(repo *repository, manifest distribution.Manifest) (ManifestHandler, error) {
+	switch t := manifest.(type) {
+	case *schema1.SignedManifest:
+		return &manifestSchema1Handler{repo: repo, manifest: t}, nil
+	case *schema2.DeserializedManifest:
+		return &manifestSchema2Handler{repo: repo, manifest: t}, nil
+	default:
+		return nil, fmt.Errorf("unsupported manifest type %T", manifest)
+	}
+}
+
+// NewManifestHandlerFromImage creates a new manifest handler for a manifest stored in the given image.
+func NewManifestHandlerFromImage(repo *repository, image *imageapi.Image) (ManifestHandler, error) {
+	var (
+		manifest distribution.Manifest
+		err      error
+	)
+
+	switch image.DockerImageManifestMediaType {
+	case "", schema1.MediaTypeManifest:
+		manifest, err = unmarshalManifestSchema1([]byte(image.DockerImageManifest), image.DockerImageSignatures)
+	case schema2.MediaTypeManifest:
+		manifest, err = unmarshalManifestSchema2([]byte(image.DockerImageManifest))
+	default:
+		return nil, fmt.Errorf("unsupported manifest media type %s", image.DockerImageManifestMediaType)
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	return NewManifestHandler(repo, manifest)
+}

pkg/dockerregistry/server/manifestschema1handler.go

@@ -0,0 +1,174 @@
+package server
+
+import (
+	"encoding/json"
+	"fmt"
+	"path"
+
+	"github.com/docker/distribution"
+	"github.com/docker/distribution/context"
+	"github.com/docker/distribution/manifest/schema1"
+	"github.com/docker/distribution/reference"
+	"github.com/docker/libtrust"
+
+	"k8s.io/kubernetes/pkg/util/sets"
+
+	imageapi "github.com/openshift/origin/pkg/image/api"
+)
+
+func unmarshalManifestSchema1(content []byte, signatures [][]byte) (distribution.Manifest, error) {
+	// prefer signatures from the manifest
+	if _, err := libtrust.ParsePrettySignature(content, "signatures"); err == nil {
+		sm := schema1.SignedManifest{Canonical: content}
+		if err = json.Unmarshal(content, &sm); err == nil {
+			return &sm, nil
+		}
+	}
+
+	jsig, err := libtrust.NewJSONSignature(content, signatures...)
+	if err != nil {
+		return nil, err
+	}
+
+	// Extract the pretty JWS
+	content, err = jsig.PrettySignature("signatures")
+	if err != nil {
+		return nil, err
+	}
+
+	var sm schema1.SignedManifest
+	if err = json.Unmarshal(content, &sm); err != nil {
+		return nil, err
+	}
+	return &sm, nil
+}
+
+type manifestSchema1Handler struct {
+	repo     *repository
+	manifest *schema1.SignedManifest
+}
+
+var _ ManifestHandler = &manifestSchema1Handler{}
+
+func (h *manifestSchema1Handler) FillImageMetadata(ctx context.Context, image *imageapi.Image) error {
+	signatures, err := h.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 := h.manifest.References()
+
+	blobSet := sets.NewString()
+	image.DockerImageMetadata.Size = int64(0)
+
+	blobs := h.repo.Blobs(ctx)
+	for i := range image.DockerImageLayers {
+		layer := &image.DockerImageLayers[i]
+		// DockerImageLayers represents h.manifest.Manifest.FSLayers in reversed order
+		desc, err := blobs.Stat(ctx, refs[len(image.DockerImageLayers)-i-1].Digest)
+		if err != nil {
+			context.GetLogger(ctx).Errorf("failed to stat blob %s of image %s", layer.Name, image.DockerImageReference)
+			return err
+		}
+		// The MediaType appeared in manifest schema v2. We need to fill it
+		// manually in the old images if it is not already filled.
+		if len(layer.MediaType) == 0 {
+			if len(desc.MediaType) > 0 {
+				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)
+		}
+	}
+
+	return nil
+}
+
+func (h *manifestSchema1Handler) Manifest() distribution.Manifest {
+	return h.manifest
+}
+
+func (h *manifestSchema1Handler) Payload() (mediaType string, payload []byte, canonical []byte, err error) {
+	mt, payload, err := h.manifest.Payload()
+	return mt, payload, h.manifest.Canonical, err
+}
+
+func (h *manifestSchema1Handler) Verify(ctx context.Context, skipDependencyVerification bool) error {
+	var errs distribution.ErrManifestVerification
+
+	// we want to verify that referenced blobs exist locally - thus using upstream repository object directly
+	repo := h.repo.Repository
+
+	if len(path.Join(h.repo.registryAddr, h.manifest.Name)) > reference.NameTotalLengthMax {
+		errs = append(errs,
+			distribution.ErrManifestNameInvalid{
+				Name:   h.manifest.Name,
+				Reason: fmt.Errorf("<registry-host>/<manifest-name> must not be more than %d characters", reference.NameTotalLengthMax),
+			})
+	}
+
+	if !reference.NameRegexp.MatchString(h.manifest.Name) {
+		errs = append(errs,
+			distribution.ErrManifestNameInvalid{
+				Name:   h.manifest.Name,
+				Reason: fmt.Errorf("invalid manifest name format"),
+			})
+	}
+
+	if len(h.manifest.History) != len(h.manifest.FSLayers) {
+		errs = append(errs, fmt.Errorf("mismatched history and fslayer cardinality %d != %d",
+			len(h.manifest.History), len(h.manifest.FSLayers)))
+	}
+
+	if _, err := schema1.Verify(h.manifest); err != nil {
+		switch err {
+		case libtrust.ErrMissingSignatureKey, libtrust.ErrInvalidJSONContent, libtrust.ErrMissingSignatureKey:
+			errs = append(errs, distribution.ErrManifestUnverified{})
+		default:
+			if err.Error() == "invalid signature" {
+				errs = append(errs, distribution.ErrManifestUnverified{})
+			} else {
+				errs = append(errs, err)
+			}
+		}
+	}
+
+	if skipDependencyVerification {
+		if len(errs) > 0 {
+			return errs
+		}
+		return nil
+	}
+
+	for _, fsLayer := range h.manifest.References() {
+		_, err := repo.Blobs(ctx).Stat(ctx, fsLayer.Digest)
+		if err != nil {
+			if err != distribution.ErrBlobUnknown {
+				errs = append(errs, err)
+				continue
+			}
+
+			// 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
+}

pkg/dockerregistry/server/manifestschema2handler.go

@@ -0,0 +1,112 @@
+package server
+
+import (
+	"encoding/json"
+	"errors"
+
+	"github.com/docker/distribution"
+	"github.com/docker/distribution/context"
+	"github.com/docker/distribution/manifest/schema2"
+
+	imageapi "github.com/openshift/origin/pkg/image/api"
+)
+
+var (
+	errMissingURL    = errors.New("missing URL on layer")
+	errUnexpectedURL = errors.New("unexpected URL on layer")
+)
+
+func unmarshalManifestSchema2(content []byte) (distribution.Manifest, error) {
+	var deserializedManifest schema2.DeserializedManifest
+	if err := json.Unmarshal(content, &deserializedManifest); err != nil {
+		return nil, err
+	}
+
+	return &deserializedManifest, nil
+}
+
+type manifestSchema2Handler struct {
+	repo     *repository
+	manifest *schema2.DeserializedManifest
+}
+
+var _ ManifestHandler = &manifestSchema2Handler{}
+
+func (h *manifestSchema2Handler) FillImageMetadata(ctx context.Context, image *imageapi.Image) error {
+	// The manifest.Config references a configuration object for a container by its digest.
+	// It needs to be fetched in order to fill an image object metadata below.
+	configBytes, err := h.repo.Blobs(ctx).Get(ctx, h.manifest.Config.Digest)
+	if err != nil {
+		context.GetLogger(ctx).Errorf("failed to get image config %s: %v", h.manifest.Config.Digest.String(), err)
+		return err
+	}
+	image.DockerImageConfig = string(configBytes)
+
+	if err := imageapi.ImageWithMetadata(image); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (h *manifestSchema2Handler) Manifest() distribution.Manifest {
+	return h.manifest
+}
+
+func (h *manifestSchema2Handler) Payload() (mediaType string, payload []byte, canonical []byte, err error) {
+	mt, p, err := h.manifest.Payload()
+	return mt, p, p, err
+}
+
+func (h *manifestSchema2Handler) Verify(ctx context.Context, skipDependencyVerification bool) error {
+	var errs distribution.ErrManifestVerification
+
+	if skipDependencyVerification {
+		return nil
+	}
+
+	// we want to verify that referenced blobs exist locally - thus using upstream repository object directly
+	repo := h.repo.Repository
+
+	target := h.manifest.Target()
+	_, err := repo.Blobs(ctx).Stat(ctx, target.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: target.Digest})
+	}
+
+	for _, fsLayer := range h.manifest.References() {
+		var err error
+		if fsLayer.MediaType != schema2.MediaTypeForeignLayer {
+			if len(fsLayer.URLs) == 0 {
+				_, err = repo.Blobs(ctx).Stat(ctx, fsLayer.Digest)
+			} else {
+				err = errUnexpectedURL
+			}
+		} else {
+			// Clients download this layer from an external URL, so do not check for
+			// its presense.
+			if len(fsLayer.URLs) == 0 {
+				err = errMissingURL
+			}
+		}
+		if err != nil {
+			if err != distribution.ErrBlobUnknown {
+				errs = append(errs, err)
+				continue
+			}
+
+			// 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
+}

pkg/dockerregistry/server/pullthroughblobstore_test.go

@@ -88,11 +88,11 @@ func TestPullthroughServeBlob(t *testing.T) {
 
 	client.AddReactor("get", "imagestreams", imagetest.GetFakeImageStreamGetHandler(t, *testImageStream))
 
-	blob1Desc, blob1Content, err := registrytest.UploadTestBlob(serverURL, "user/app")
+	blob1Desc, blob1Content, err := registrytest.UploadTestBlob(serverURL, nil, "user/app")
 	if err != nil {
 		t.Fatal(err)
 	}
-	blob2Desc, blob2Content, err := registrytest.UploadTestBlob(serverURL, "user/app")
+	blob2Desc, blob2Content, err := registrytest.UploadTestBlob(serverURL, nil, "user/app")
 	if err != nil {
 		t.Fatal(err)
 	}