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Break down loadManifest function into constituent parts
Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day
parent
74528be903
commit
84413be3c9
1 changed files with 95 additions and 67 deletions
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@ -19,19 +19,9 @@ import (
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// verification fails. The boolean return will only be false without error on
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// the failure of signatures trust check.
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func (s *TagStore) loadManifest(manifestBytes []byte, ref string, remoteDigest digest.Digest) (digest.Digest, *registry.ManifestData, bool, error) {
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sig, err := libtrust.ParsePrettySignature(manifestBytes, "signatures")
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payload, keys, err := unpackSignedManifest(manifestBytes)
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if err != nil {
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return "", nil, false, fmt.Errorf("error parsing payload: %s", err)
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}
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keys, err := sig.Verify()
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if err != nil {
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return "", nil, false, fmt.Errorf("error verifying payload: %s", err)
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}
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payload, err := sig.Payload()
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if err != nil {
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return "", nil, false, fmt.Errorf("error retrieving payload: %s", err)
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return "", nil, false, fmt.Errorf("error unpacking manifest: %v", err)
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}
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// TODO(stevvooe): It would be a lot better here to build up a stack of
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@ -41,59 +31,32 @@ func (s *TagStore) loadManifest(manifestBytes []byte, ref string, remoteDigest d
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var localDigest digest.Digest
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// verify the local digest, if present in tag
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if dgst, err := digest.ParseDigest(ref); err != nil {
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logrus.Debugf("provided manifest reference %q is not a digest: %v", ref, err)
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// Verify the local digest, if present in ref. ParseDigest will validate
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// that the ref is a digest and verify against that if present. Otherwize
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// (on error), we simply compute the localDigest and proceed.
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if dgst, err := digest.ParseDigest(ref); err == nil {
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// verify the manifest against local ref
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if err := verifyDigest(dgst, payload); err != nil {
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return "", nil, false, fmt.Errorf("verifying local digest: %v", err)
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}
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// we don't have a local digest, since we are working from a tag.
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// Digest the payload and return that.
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localDigest = dgst
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} else {
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// We don't have a local digest, since we are working from a tag.
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// Compute the digest of the payload and return that.
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logrus.Debugf("provided manifest reference %q is not a digest: %v", ref, err)
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localDigest, err = digest.FromBytes(payload)
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if err != nil {
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// near impossible
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logrus.Errorf("error calculating local digest during tag pull: %v", err)
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return "", nil, false, err
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}
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} else {
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// verify the manifest against local ref
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verifier, err := digest.NewDigestVerifier(dgst)
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if err != nil {
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// There are not many ways this can go wrong: if it does, its
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// fatal. Likley, the cause would be poor validation of the
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// incoming reference.
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return "", nil, false, fmt.Errorf("error creating verifier for local digest reference %q: %v", dgst, err)
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}
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if _, err := verifier.Write(payload); err != nil {
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return "", nil, false, fmt.Errorf("error writing payload to local digest reference verifier: %v", err)
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}
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if !verifier.Verified() {
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return "", nil, false, fmt.Errorf("verification against local digest reference %q failed", dgst)
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}
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localDigest = dgst
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}
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// verify against the remote digest, if available
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if remoteDigest != "" {
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if err := remoteDigest.Validate(); err != nil {
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return "", nil, false, fmt.Errorf("error validating remote digest %q: %v", remoteDigest, err)
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}
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verifier, err := digest.NewDigestVerifier(remoteDigest)
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if err != nil {
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// There are not many ways this can go wrong: if it does, its
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// fatal. Likley, the cause would be poor validation of the
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// incoming reference.
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return "", nil, false, fmt.Errorf("error creating verifier for remote digest %q: %v", remoteDigest, err)
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}
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if _, err := verifier.Write(payload); err != nil {
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return "", nil, false, fmt.Errorf("error writing payload to remote digest verifier (verifier target %q): %v", remoteDigest, err)
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}
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if !verifier.Verified() {
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return "", nil, false, fmt.Errorf("verification against remote digest %q failed", remoteDigest)
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if err := verifyDigest(remoteDigest, payload); err != nil {
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return "", nil, false, fmt.Errorf("verifying remote digest: %v", err)
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}
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}
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@ -101,9 +64,6 @@ func (s *TagStore) loadManifest(manifestBytes []byte, ref string, remoteDigest d
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if err := json.Unmarshal(payload, &manifest); err != nil {
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return "", nil, false, fmt.Errorf("error unmarshalling manifest: %s", err)
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}
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if manifest.SchemaVersion != 1 {
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return "", nil, false, fmt.Errorf("unsupported schema version: %d", manifest.SchemaVersion)
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}
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// validate the contents of the manifest
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if err := validateManifest(&manifest); err != nil {
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@ -111,33 +71,101 @@ func (s *TagStore) loadManifest(manifestBytes []byte, ref string, remoteDigest d
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}
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var verified bool
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verified, err = s.verifyTrustedKeys(manifest.Name, keys)
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if err != nil {
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return "", nil, false, fmt.Errorf("error verifying trusted keys: %v", err)
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}
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return localDigest, &manifest, verified, nil
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}
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// unpackSignedManifest takes the raw, signed manifest bytes, unpacks the jws
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// and returns the payload and public keys used to signed the manifest.
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// Signatures are verified for authenticity but not against the trust store.
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func unpackSignedManifest(p []byte) ([]byte, []libtrust.PublicKey, error) {
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sig, err := libtrust.ParsePrettySignature(p, "signatures")
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if err != nil {
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return nil, nil, fmt.Errorf("error parsing payload: %s", err)
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}
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keys, err := sig.Verify()
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if err != nil {
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return nil, nil, fmt.Errorf("error verifying payload: %s", err)
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}
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payload, err := sig.Payload()
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if err != nil {
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return nil, nil, fmt.Errorf("error retrieving payload: %s", err)
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}
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return payload, keys, nil
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}
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// verifyTrustedKeys checks the keys provided against the trust store,
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// ensuring that the provided keys are trusted for the namespace. The keys
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// provided from this method must come from the signatures provided as part of
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// the manifest JWS package, obtained from unpackSignedManifest or libtrust.
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func (s *TagStore) verifyTrustedKeys(namespace string, keys []libtrust.PublicKey) (verified bool, err error) {
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if namespace[0] != '/' {
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namespace = "/" + namespace
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}
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for _, key := range keys {
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namespace := manifest.Name
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if namespace[0] != '/' {
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namespace = "/" + namespace
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}
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b, err := key.MarshalJSON()
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if err != nil {
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return "", nil, false, fmt.Errorf("error marshalling public key: %s", err)
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return false, fmt.Errorf("error marshalling public key: %s", err)
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}
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// Check key has read/write permission (0x03)
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v, err := s.trustService.CheckKey(namespace, b, 0x03)
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if err != nil {
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vErr, ok := err.(trust.NotVerifiedError)
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if !ok {
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return "", nil, false, fmt.Errorf("error running key check: %s", err)
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return false, fmt.Errorf("error running key check: %s", err)
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}
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logrus.Debugf("Key check result: %v", vErr)
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}
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verified = v
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if verified {
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logrus.Debug("Key check result: verified")
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}
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}
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return localDigest, &manifest, verified, nil
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if verified {
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logrus.Debug("Key check result: verified")
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}
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return
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}
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// verifyDigest checks the contents of p against the provided digest. Note
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// that for manifests, this is the signed payload and not the raw bytes with
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// signatures.
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func verifyDigest(dgst digest.Digest, p []byte) error {
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if err := dgst.Validate(); err != nil {
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return fmt.Errorf("error validating digest %q: %v", dgst, err)
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}
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verifier, err := digest.NewDigestVerifier(dgst)
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if err != nil {
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// There are not many ways this can go wrong: if it does, its
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// fatal. Likley, the cause would be poor validation of the
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// incoming reference.
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return fmt.Errorf("error creating verifier for digest %q: %v", dgst, err)
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}
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if _, err := verifier.Write(p); err != nil {
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return fmt.Errorf("error writing payload to digest verifier (verifier target %q): %v", dgst, err)
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}
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if !verifier.Verified() {
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return fmt.Errorf("verification against digest %q failed", dgst)
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}
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return nil
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}
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func validateManifest(manifest *registry.ManifestData) error {
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if manifest.SchemaVersion != 1 {
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return fmt.Errorf("unsupported schema version: %d", manifest.SchemaVersion)
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}
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if len(manifest.FSLayers) != len(manifest.History) {
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return fmt.Errorf("length of history not equal to number of layers")
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}
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