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Add support for Sigstore bundle in sign-blob
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -28,6 +28,8 @@ bin* | |
| dist/ | ||
| cosignImagerefs | ||
| bundle | ||
| !pkg/bundle | ||
| !pkg/cosign/bundle | ||
| signature | ||
| certificate | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| // Copyright 2024 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. | ||
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| package bundle | ||
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| import ( | ||
| "fmt" | ||
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| pbbundle "github.com/sigstore/protobuf-specs/gen/pb-go/bundle/v1" | ||
| pbcommon "github.com/sigstore/protobuf-specs/gen/pb-go/common/v1" | ||
| "github.com/sigstore/protobuf-specs/gen/pb-go/dsse" | ||
| pbrekor "github.com/sigstore/protobuf-specs/gen/pb-go/rekor/v1" | ||
| "github.com/sigstore/rekor/pkg/tle" | ||
| ) | ||
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| func Build(entity SignedEntity) (*pbbundle.Bundle, error) { | ||
| bundle := &pbbundle.Bundle{ | ||
| MediaType: "application/vnd.dev.sigstore.bundle+json;version=0.2", | ||
| } | ||
| var err error | ||
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| bundle.VerificationMaterial, err = buildVerificationMaterial(entity) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| sig, err := entity.SignatureContent() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to fetch signature content: %w", err) | ||
| } | ||
| if ms := sig.MessageSignatureContent(); ms != nil { | ||
| bundle.Content = &pbbundle.Bundle_MessageSignature{ | ||
| MessageSignature: &pbcommon.MessageSignature{ | ||
| MessageDigest: &pbcommon.HashOutput{ | ||
| Algorithm: AsPbHashAlgorithm(ms.DigestAlgorithm()), | ||
| Digest: ms.Digest(), | ||
| }, | ||
| Signature: ms.Signature(), | ||
| }, | ||
| } | ||
| } else if envelop := sig.EnvelopeContent(); envelop != nil { | ||
| rawEnvelope := envelop.RawEnvelope() | ||
| dsseSignatures := make([]*dsse.Signature, len(rawEnvelope.Signatures)) | ||
| for i, s := range rawEnvelope.Signatures { | ||
| dsseSignatures[i] = &dsse.Signature{Keyid: s.KeyID, Sig: []byte(s.Sig)} | ||
| } | ||
| bundle.Content = &pbbundle.Bundle_DsseEnvelope{ | ||
| DsseEnvelope: &dsse.Envelope{ | ||
| Payload: []byte(rawEnvelope.Payload), | ||
| PayloadType: rawEnvelope.PayloadType, | ||
| Signatures: dsseSignatures, | ||
| }, | ||
| } | ||
| } | ||
|
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| return bundle, nil | ||
| } | ||
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| func buildVerificationMaterial(entity SignedEntity) (*pbbundle.VerificationMaterial, error) { | ||
| vm := pbbundle.VerificationMaterial{} | ||
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| vc, err := entity.VerificationContent() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to fetch verification content: %w", err) | ||
| } | ||
| if cert, ok := vc.HasCertificate(); ok { | ||
| vm.Content = &pbbundle.VerificationMaterial_X509CertificateChain{ | ||
| X509CertificateChain: &pbcommon.X509CertificateChain{ | ||
| Certificates: []*pbcommon.X509Certificate{ | ||
| {RawBytes: cert.Raw}, | ||
| }, | ||
| }, | ||
| } | ||
| } else if pub, ok := vc.HasPublicKey(); ok { | ||
| vm.Content = &pbbundle.VerificationMaterial_PublicKey{ | ||
| PublicKey: &pbcommon.PublicKeyIdentifier{ | ||
| Hint: pub.Hint(), | ||
| }, | ||
| } | ||
| } | ||
|
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| logEntry, err := entity.TlogEntry() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to fetch transparency log entry: %w", err) | ||
| } | ||
| if logEntry != nil { | ||
| tlEntry, err := tle.GenerateTransparencyLogEntry(*logEntry) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to generate TransparencyLogEntry: %w", err) | ||
| } | ||
| vm.TlogEntries = []*pbrekor.TransparencyLogEntry{tlEntry} | ||
| } | ||
|
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| timestamps, err := entity.Timestamps() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to fetch timestamps: %w", err) | ||
| } | ||
| if len(timestamps) > 0 { | ||
| rfc3161timestamps := make([]*pbcommon.RFC3161SignedTimestamp, len(timestamps)) | ||
| for i, timestamp := range timestamps { | ||
| rfc3161timestamps[i] = &pbcommon.RFC3161SignedTimestamp{SignedTimestamp: timestamp} | ||
| } | ||
| vm.TimestampVerificationData = &pbbundle.TimestampVerificationData{ | ||
| Rfc3161Timestamps: rfc3161timestamps, | ||
| } | ||
| } | ||
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| return &vm, nil | ||
| } | ||
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| func AsPbHashAlgorithm(in string) pbcommon.HashAlgorithm { | ||
| switch in { | ||
| case "SHA2_256": | ||
| return pbcommon.HashAlgorithm_SHA2_256 | ||
| default: | ||
| panic(fmt.Sprintf("unknown hash algorithm: %s", in)) | ||
| } | ||
| } |
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