Avoid remote.Gets when the ref contains a digest (#487)

* Avoid remote.Gets when the ref contains a digest Signed-off-by: Jason Hall <jasonhall@redhat.com> * license header Signed-off-by: Jason Hall <jasonhall@redhat.com> * appease lint Signed-off-by: Jason Hall <jasonhall@redhat.com>
sigstore · Jul 27, 2021 · 1a660a2 · 1a660a2
1 parent ade62cd
commit 1a660a2
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Showing 13 changed files with 99 additions and 68 deletions.
diff --git a/cmd/cosign/cli/attach/sbom.go b/cmd/cosign/cli/attach/sbom.go
@@ -23,7 +23,6 @@ import (
 	"os"
 
 	"github.com/google/go-containerregistry/pkg/name"
-	"github.com/google/go-containerregistry/pkg/v1/remote"
 	"github.com/google/go-containerregistry/pkg/v1/types"
 	"github.com/peterbourgon/ff/v3/ffcli"
 
@@ -69,21 +68,21 @@ func SBOMCmd(ctx context.Context, sbomRef, sbomType, imageRef string) error {
 		return err
 	}
 
-	b, err := ioutil.ReadFile(sbomRef)
+	h, err := cli.Digest(ctx, ref)
 	if err != nil {
 		return err
 	}
 
-	regClientOpts := cli.DefaultRegistryClientOpts(ctx)
-	get, err := remote.Get(ref, regClientOpts...)
+	b, err := ioutil.ReadFile(sbomRef)
 	if err != nil {
 		return err
 	}
+
 	repo := ref.Context()
-	dstRef := cosign.AttachedImageTag(repo, get, cosign.SBOMTagSuffix)
+	dstRef := cosign.AttachedImageTag(repo, h, cosign.SBOMTagSuffix)
 
 	fmt.Fprintf(os.Stderr, "Uploading SBOM file for [%s] to [%s] with mediaType [%s].\n", ref.Name(), dstRef.Name(), sbomType)
-	if _, err := cremote.UploadFile(b, dstRef, types.MediaType(sbomType), types.OCIConfigJSON, regClientOpts...); err != nil {
+	if _, err := cremote.UploadFile(b, dstRef, types.MediaType(sbomType), types.OCIConfigJSON, cli.DefaultRegistryClientOpts(ctx)...); err != nil {
 		return err
 	}
 

diff --git a/cmd/cosign/cli/attach/sig.go b/cmd/cosign/cli/attach/sig.go
@@ -25,7 +25,6 @@ import (
 	"path/filepath"
 
 	"github.com/google/go-containerregistry/pkg/name"
-	"github.com/google/go-containerregistry/pkg/v1/remote"
 	"github.com/peterbourgon/ff/v3/ffcli"
 
 	"github.com/sigstore/cosign/cmd/cosign/cli"
@@ -56,8 +55,6 @@ func Signature() *ffcli.Command {
 }
 
 func SignatureCmd(ctx context.Context, sigRef, payloadRef, imageRef string) error {
-	var b64SigBytes []byte
-
 	b64SigBytes, err := signatureBytes(sigRef)
 	if err != nil {
 		return err
@@ -70,22 +67,21 @@ func SignatureCmd(ctx context.Context, sigRef, payloadRef, imageRef string) erro
 		return err
 	}
 
-	regClientOpts := cli.DefaultRegistryClientOpts(ctx)
-	get, err := remote.Get(ref, regClientOpts...)
+	h, err := cli.Digest(ctx, ref)
 	if err != nil {
 		return err
 	}
-	repo := ref.Context()
-	img := repo.Digest(get.Digest.String())
 
 	sigRepo, err := cli.TargetRepositoryForImage(ref)
 	if err != nil {
 		return err
 	}
-	dstRef := cosign.AttachedImageTag(sigRepo, get, cosign.SignatureTagSuffix)
+	dstRef := cosign.AttachedImageTag(sigRepo, h, cosign.SignatureTagSuffix)
 
 	var payload []byte
 	if payloadRef == "" {
+		repo := ref.Context()
+		img := repo.Digest(h.String())
 		payload, err = (&sigPayload.Cosign{Image: img}).MarshalJSON()
 	} else {
 		payload, err = ioutil.ReadFile(filepath.Clean(payloadRef))
@@ -99,6 +95,7 @@ func SignatureCmd(ctx context.Context, sigRef, payloadRef, imageRef string) erro
 	if err != nil {
 		return err
 	}
+	regClientOpts := cli.DefaultRegistryClientOpts(ctx)
 	if _, err := cremote.UploadSignature(sigBytes, payload, dstRef, cremote.UploadOpts{RemoteOpts: regClientOpts}); err != nil {
 		return err
 	}

diff --git a/cmd/cosign/cli/attest.go b/cmd/cosign/cli/attest.go
@@ -29,7 +29,6 @@ import (
 
 	"github.com/google/go-containerregistry/pkg/name"
 	ggcrV1 "github.com/google/go-containerregistry/pkg/v1"
-	"github.com/google/go-containerregistry/pkg/v1/remote"
 	"github.com/in-toto/in-toto-golang/in_toto"
 	"github.com/peterbourgon/ff/v3/ffcli"
 	"github.com/pkg/errors"
@@ -127,13 +126,12 @@ func AttestCmd(ctx context.Context, ko KeyOpts, imageRef string, certPath string
 	if err != nil {
 		return errors.Wrap(err, "parsing reference")
 	}
-	get, err := remote.Get(ref, remoteOpts...)
+	h, err := Digest(ctx, ref)
 	if err != nil {
-		return errors.Wrap(err, "getting remote image")
+		return err
 	}
-
 	repo := ref.Context()
-	img := repo.Digest(get.Digest.String())
+	img := repo.Digest(h.String())
 
 	sv, err := signerFromKeyOpts(ctx, certPath, ko)
 	if err != nil {
@@ -155,7 +153,7 @@ func AttestCmd(ctx context.Context, ko KeyOpts, imageRef string, certPath string
 				{
 					Name: repo.String(),
 					Digest: map[string]string{
-						"sha256": get.Digest.Hex,
+						"sha256": h.Hex,
 					},
 				},
 			},
@@ -187,11 +185,7 @@ func AttestCmd(ctx context.Context, ko KeyOpts, imageRef string, certPath string
 	if err != nil {
 		return err
 	}
-	attRef := cosign.AttachedImageTag(sigRepo, &remote.Descriptor{
-		Descriptor: ggcrV1.Descriptor{
-			Digest: imgHash,
-		},
-	}, cosign.AttestationTagSuffix)
+	attRef := cosign.AttachedImageTag(sigRepo, imgHash, cosign.AttestationTagSuffix)
 
 	uo := cremote.UploadOpts{
 		Cert:         sv.Cert,

diff --git a/cmd/cosign/cli/clean.go b/cmd/cosign/cli/clean.go
@@ -20,7 +20,6 @@ import (
 	"flag"
 	"fmt"
 
-	"github.com/google/go-containerregistry/pkg/authn"
 	"github.com/google/go-containerregistry/pkg/name"
 	"github.com/google/go-containerregistry/pkg/v1/remote"
 	"github.com/peterbourgon/ff/v3/ffcli"
@@ -53,9 +52,7 @@ func CleanCmd(ctx context.Context, imageRef string) error {
 		return err
 	}
 
-	remoteOpts := []remote.Option{remote.WithAuthFromKeychain(authn.DefaultKeychain), remote.WithContext(ctx)}
-	// TODO: just return the descriptor directly if we have a digest reference.
-	desc, err := remote.Get(ref, remoteOpts...)
+	h, err := Digest(ctx, ref)
 	if err != nil {
 		return err
 	}
@@ -64,12 +61,12 @@ func CleanCmd(ctx context.Context, imageRef string) error {
 	if err != nil {
 		return err
 	}
-	sigRef := cosign.AttachedImageTag(sigRepo, desc, cosign.SignatureTagSuffix)
+	sigRef := cosign.AttachedImageTag(sigRepo, h, cosign.SignatureTagSuffix)
 	fmt.Println(sigRef)
 
 	fmt.Println("Deleting signature metadata...")
 
-	err = remote.Delete(sigRef, remoteOpts...)
+	err = remote.Delete(sigRef, DefaultRegistryClientOpts(ctx)...)
 	if err != nil {
 		return err
 	}

diff --git a/cmd/cosign/cli/copy.go b/cmd/cosign/cli/copy.go
@@ -67,8 +67,8 @@ func CopyCmd(ctx context.Context, srcImg, dstImg string, sigOnly, force bool) er
 	if err != nil {
 		return err
 	}
-	regClientOpts := DefaultRegistryClientOpts(ctx)
-	gotSrc, err := remote.Get(srcRef, regClientOpts...)
+
+	h, err := Digest(ctx, srcRef)
 	if err != nil {
 		return err
 	}
@@ -78,11 +78,12 @@ func CopyCmd(ctx context.Context, srcImg, dstImg string, sigOnly, force bool) er
 		return err
 	}
 
-	sigSrcRef := cosign.AttachedImageTag(srcSigRepo, gotSrc, cosign.SignatureTagSuffix)
+	sigSrcRef := cosign.AttachedImageTag(srcSigRepo, h, cosign.SignatureTagSuffix)
 
 	dstRepoRef := dstRef.Context()
 	sigDstRef := dstRepoRef.Tag(sigSrcRef.Identifier())
 
+	regClientOpts := DefaultRegistryClientOpts(ctx)
 	if err := copyImage(sigSrcRef, sigDstRef, force, regClientOpts...); err != nil {
 		return err
 	}

diff --git a/cmd/cosign/cli/digest.go b/cmd/cosign/cli/digest.go
@@ -0,0 +1,38 @@
+// Copyright 2021 The Sigstore Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cli
+
+import (
+	"context"
+
+	"github.com/google/go-containerregistry/pkg/name"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/remote"
+)
+
+// Digest returns the digest of the image at the reference.
+//
+// If the reference is by digest already, it simply extracts the digest.
+// Otherwise, it looks up the digest from the registry.
+func Digest(ctx context.Context, ref name.Reference) (v1.Hash, error) {
+	if d, ok := ref.(name.Digest); ok {
+		return v1.NewHash(d.DigestStr())
+	}
+	desc, err := remote.Get(ref, DefaultRegistryClientOpts(ctx)...)
+	if err != nil {
+		return v1.Hash{}, err
+	}
+	return desc.Digest, nil
+}
diff --git a/cmd/cosign/cli/download/sbom.go b/cmd/cosign/cli/download/sbom.go
@@ -23,7 +23,6 @@ import (
 	"io/ioutil"
 	"os"
 
-	"github.com/google/go-containerregistry/pkg/authn"
 	"github.com/google/go-containerregistry/pkg/name"
 	"github.com/google/go-containerregistry/pkg/v1/remote"
 	"github.com/peterbourgon/ff/v3/ffcli"
@@ -56,15 +55,13 @@ func SBOMCmd(ctx context.Context, imageRef string, out io.Writer) ([]string, err
 		return nil, err
 	}
 
-	auth := remote.WithAuthFromKeychain(authn.DefaultKeychain)
-
-	get, err := remote.Get(ref, auth)
+	h, err := cli.Digest(ctx, ref)
 	if err != nil {
 		return nil, err
 	}
 
 	repo := ref.Context()
-	dstRef := cosign.AttachedImageTag(repo, get, cosign.SBOMTagSuffix)
+	dstRef := cosign.AttachedImageTag(repo, h, cosign.SBOMTagSuffix)
 	img, err := remote.Image(dstRef, cli.DefaultRegistryClientOpts(ctx)...)
 	if err != nil {
 		return nil, err

diff --git a/cmd/cosign/cli/sign.go b/cmd/cosign/cli/sign.go
@@ -307,11 +307,7 @@ func SignCmd(ctx context.Context, ko KeyOpts, annotations map[string]interface{}
 		if err != nil {
 			return err
 		}
-		sigRef := cosign.AttachedImageTag(sigRepo, &remote.Descriptor{
-			Descriptor: ggcrV1.Descriptor{
-				Digest: imgHash,
-			},
-		}, cosign.SignatureTagSuffix)
+		sigRef := cosign.AttachedImageTag(sigRepo, imgHash, cosign.SignatureTagSuffix)
 
 		uo := cremote.UploadOpts{
 			Cert:         sv.Cert,

diff --git a/cmd/cosign/cli/triangulate.go b/cmd/cosign/cli/triangulate.go
@@ -20,9 +20,7 @@ import (
 	"flag"
 	"fmt"
 
-	"github.com/google/go-containerregistry/pkg/authn"
 	"github.com/google/go-containerregistry/pkg/name"
-	"github.com/google/go-containerregistry/pkg/v1/remote"
 	"github.com/peterbourgon/ff/v3/ffcli"
 
 	"github.com/sigstore/cosign/pkg/cosign"
@@ -52,8 +50,7 @@ func MungeCmd(ctx context.Context, imageRef string) error {
 		return err
 	}
 
-	// TODO: just return the descriptor directly if we have a digest reference.
-	desc, err := remote.Get(ref, remote.WithAuthFromKeychain(authn.DefaultKeychain), remote.WithContext(ctx))
+	h, err := Digest(ctx, ref)
 	if err != nil {
 		return err
 	}
@@ -62,7 +59,7 @@ func MungeCmd(ctx context.Context, imageRef string) error {
 	if err != nil {
 		return err
 	}
-	dstRef := cosign.AttachedImageTag(sigRepo, desc, cosign.SignatureTagSuffix)
+	dstRef := cosign.AttachedImageTag(sigRepo, h, cosign.SignatureTagSuffix)
 
 	fmt.Println(dstRef.Name())
 	return nil

diff --git a/pkg/cosign/fetch.go b/pkg/cosign/fetch.go
@@ -25,6 +25,7 @@ import (
 	"strings"
 
 	"github.com/google/go-containerregistry/pkg/name"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/remote"
 	"github.com/pkg/errors"
 	cremote "github.com/sigstore/cosign/pkg/cosign/remote"
@@ -56,9 +57,9 @@ const (
 	AttestationTagSuffix = ".att"
 )
 
-func AttachedImageTag(repo name.Repository, imgDesc *remote.Descriptor, tagSuffix string) name.Tag {
+func AttachedImageTag(repo name.Repository, digest v1.Hash, tagSuffix string) name.Tag {
 	// sha256:d34db33f -> sha256-d34db33f.suffix
-	tagStr := strings.ReplaceAll(imgDesc.Digest.String(), ":", "-") + tagSuffix
+	tagStr := strings.ReplaceAll(digest.String(), ":", "-") + tagSuffix
 	return repo.Tag(tagStr)
 }
 
@@ -67,11 +68,11 @@ func FetchSignaturesForImage(ctx context.Context, signedImgRef name.Reference, s
 	if err != nil {
 		return nil, err
 	}
-	return FetchSignaturesForDescriptor(ctx, signedImgDesc, sigRepo, sigTagSuffix, registryOpts...)
+	return FetchSignaturesForImageDigest(ctx, signedImgDesc.Descriptor.Digest, sigRepo, sigTagSuffix, registryOpts...)
 }
 
-func FetchSignaturesForDescriptor(ctx context.Context, signedDescriptor *remote.Descriptor, sigRepo name.Repository, sigTagSuffix string, registryOpts ...remote.Option) ([]SignedPayload, error) {
-	sigImgDesc, err := remote.Get(AttachedImageTag(sigRepo, signedDescriptor, sigTagSuffix), registryOpts...)
+func FetchSignaturesForImageDigest(ctx context.Context, signedImageDigest v1.Hash, sigRepo name.Repository, sigTagSuffix string, registryOpts ...remote.Option) ([]SignedPayload, error) {
+	sigImgDesc, err := remote.Get(AttachedImageTag(sigRepo, signedImageDigest, sigTagSuffix), registryOpts...)
 	if err != nil {
 		return nil, errors.Wrap(err, "getting signature manifest")
 	}

diff --git a/pkg/cosign/verifiers.go b/pkg/cosign/verifiers.go
@@ -24,13 +24,13 @@ import (
 	"github.com/sigstore/sigstore/pkg/signature/payload"
 )
 
-func SimpleClaimVerifier(sp SignedPayload, desc *v1.Descriptor, annotations map[string]interface{}) error {
+func SimpleClaimVerifier(sp SignedPayload, digest v1.Hash, annotations map[string]interface{}) error {
 	ss := &payload.SimpleContainerImage{}
 	if err := json.Unmarshal(sp.Payload, ss); err != nil {
 		return err
 	}
 
-	if err := sp.VerifyClaims(desc, ss); err != nil {
+	if err := sp.VerifyClaims(digest, ss); err != nil {
 		return err
 	}
 
@@ -42,7 +42,7 @@ func SimpleClaimVerifier(sp SignedPayload, desc *v1.Descriptor, annotations map[
 	return nil
 }
 
-func IntotoSubjectClaimVerifier(sp SignedPayload, desc *v1.Descriptor, _ map[string]interface{}) error {
+func IntotoSubjectClaimVerifier(sp SignedPayload, digest v1.Hash, _ map[string]interface{}) error {
 	st := &in_toto.Statement{}
 	if err := json.Unmarshal(sp.Payload, st); err != nil {
 		return err
@@ -54,7 +54,7 @@ func IntotoSubjectClaimVerifier(sp SignedPayload, desc *v1.Descriptor, _ map[str
 			continue
 		}
 		subjDigest := "sha256:" + dgst
-		if subjDigest == desc.Digest.String() {
+		if subjDigest == digest.String() {
 			return nil
 		}
 	}