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Add the ability to contruct TrustRoot from targets (#247)
* Add the ability to contruct TrustRoot from targets Signed-off-by: Slavek Kabrda <[email protected]> * Address review, fix linting issues Signed-off-by: Slavek Kabrda <[email protected]> * Fix test by stripping second fraction from input Signed-off-by: Slavek Kabrda <[email protected]> * Add an example, fix a public key reading error case Signed-off-by: Slavek Kabrda <[email protected]> * Address review Signed-off-by: Slavek Kabrda <[email protected]> * Address review, pull out sorting functionality in separate functions Signed-off-by: Slavek Kabrda <[email protected]> --------- Signed-off-by: Slavek Kabrda <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,235 @@ | ||
| // Copyright 2023 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 root | ||
|
|
||
| import ( | ||
| "crypto" | ||
| "crypto/ecdsa" | ||
| "crypto/ed25519" | ||
| "crypto/elliptic" | ||
| "crypto/rsa" | ||
| "crypto/x509" | ||
| "fmt" | ||
| "sort" | ||
| "time" | ||
|
|
||
| protocommon "github.com/sigstore/protobuf-specs/gen/pb-go/common/v1" | ||
| prototrustroot "github.com/sigstore/protobuf-specs/gen/pb-go/trustroot/v1" | ||
| timestamppb "google.golang.org/protobuf/types/known/timestamppb" | ||
| ) | ||
|
|
||
| func (tr *TrustedRoot) constructProtoTrustRoot() error { | ||
| tr.trustedRoot = &prototrustroot.TrustedRoot{} | ||
| tr.trustedRoot.MediaType = TrustedRootMediaType01 | ||
|
|
||
| for logID, transparencyLog := range tr.rekorLogs { | ||
| tlProto, err := transparencyLogToProtobufTL(transparencyLog) | ||
| if err != nil { | ||
| return fmt.Errorf("failed converting rekor log %s to protobuf: %w", logID, err) | ||
| } | ||
| tr.trustedRoot.Tlogs = append(tr.trustedRoot.Tlogs, tlProto) | ||
| } | ||
| // ensure stable sorting of the slice | ||
| sortTlogSlice(tr.trustedRoot.Tlogs) | ||
|
|
||
| for logID, ctLog := range tr.ctLogs { | ||
| ctProto, err := transparencyLogToProtobufTL(ctLog) | ||
| if err != nil { | ||
| return fmt.Errorf("failed converting ctlog %s to protobuf: %w", logID, err) | ||
| } | ||
| tr.trustedRoot.Ctlogs = append(tr.trustedRoot.Ctlogs, ctProto) | ||
| } | ||
| // ensure stable sorting of the slice | ||
| sortTlogSlice(tr.trustedRoot.Ctlogs) | ||
|
|
||
| for _, ca := range tr.fulcioCertAuthorities { | ||
| caProto, err := certificateAuthorityToProtobufCA(&ca) | ||
| if err != nil { | ||
| return fmt.Errorf("failed converting fulcio cert chain to protobuf: %w", err) | ||
| } | ||
| tr.trustedRoot.CertificateAuthorities = append(tr.trustedRoot.CertificateAuthorities, caProto) | ||
| } | ||
| // ensure stable sorting of the slice | ||
| sortCASlice(tr.trustedRoot.CertificateAuthorities) | ||
|
|
||
| for _, ca := range tr.timestampingAuthorities { | ||
| caProto, err := certificateAuthorityToProtobufCA(&ca) | ||
| if err != nil { | ||
| return fmt.Errorf("failed converting TSA cert chain to protobuf: %w", err) | ||
| } | ||
| tr.trustedRoot.TimestampAuthorities = append(tr.trustedRoot.TimestampAuthorities, caProto) | ||
| } | ||
| // ensure stable sorting of the slice | ||
| sortCASlice(tr.trustedRoot.TimestampAuthorities) | ||
|
|
||
| return nil | ||
| } | ||
|
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| func sortCASlice(slc []*prototrustroot.CertificateAuthority) { | ||
| sort.Slice(slc, func(i, j int) bool { | ||
| iTime := time.Unix(0, 0) | ||
| jTime := time.Unix(0, 0) | ||
|
|
||
| if slc[i].ValidFor.Start != nil { | ||
| iTime = slc[i].ValidFor.Start.AsTime() | ||
| } | ||
| if slc[j].ValidFor.Start != nil { | ||
| jTime = slc[j].ValidFor.Start.AsTime() | ||
| } | ||
|
|
||
| return iTime.Before(jTime) | ||
| }) | ||
| } | ||
|
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| func sortTlogSlice(slc []*prototrustroot.TransparencyLogInstance) { | ||
| sort.Slice(slc, func(i, j int) bool { | ||
| iTime := time.Unix(0, 0) | ||
| jTime := time.Unix(0, 0) | ||
|
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| if slc[i].PublicKey.ValidFor.Start != nil { | ||
| iTime = slc[i].PublicKey.ValidFor.Start.AsTime() | ||
| } | ||
| if slc[j].PublicKey.ValidFor.Start != nil { | ||
| jTime = slc[j].PublicKey.ValidFor.Start.AsTime() | ||
| } | ||
|
|
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| return iTime.Before(jTime) | ||
| }) | ||
| } | ||
|
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| func certificateAuthorityToProtobufCA(ca *CertificateAuthority) (*prototrustroot.CertificateAuthority, error) { | ||
| org := "" | ||
| if len(ca.Root.Subject.Organization) > 0 { | ||
| org = ca.Root.Subject.Organization[0] | ||
| } | ||
| var allCerts []*protocommon.X509Certificate | ||
| if ca.Leaf != nil { | ||
| allCerts = append(allCerts, &protocommon.X509Certificate{RawBytes: ca.Leaf.Raw}) | ||
| } | ||
| for _, intermed := range ca.Intermediates { | ||
| allCerts = append(allCerts, &protocommon.X509Certificate{RawBytes: intermed.Raw}) | ||
| } | ||
| if ca.Root == nil { | ||
| return nil, fmt.Errorf("root certificate is nil") | ||
| } | ||
| allCerts = append(allCerts, &protocommon.X509Certificate{RawBytes: ca.Root.Raw}) | ||
|
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| caProto := prototrustroot.CertificateAuthority{ | ||
| Uri: ca.URI, | ||
| Subject: &protocommon.DistinguishedName{ | ||
| Organization: org, | ||
| CommonName: ca.Root.Subject.CommonName, | ||
| }, | ||
| ValidFor: &protocommon.TimeRange{ | ||
| Start: timestamppb.New(ca.ValidityPeriodStart), | ||
| }, | ||
| CertChain: &protocommon.X509CertificateChain{ | ||
| Certificates: allCerts, | ||
| }, | ||
| } | ||
|
|
||
| if !ca.ValidityPeriodEnd.IsZero() { | ||
| caProto.ValidFor.End = timestamppb.New(ca.ValidityPeriodEnd) | ||
| } | ||
|
|
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| return &caProto, nil | ||
| } | ||
|
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| func transparencyLogToProtobufTL(tl *TransparencyLog) (*prototrustroot.TransparencyLogInstance, error) { | ||
| hashAlgo, err := hashAlgorithmToProtobufHashAlgorithm(tl.HashFunc) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed converting hash algorithm to protobuf: %w", err) | ||
| } | ||
| publicKey, err := publicKeyToProtobufPublicKey(tl.PublicKey, tl.ValidityPeriodStart, tl.ValidityPeriodEnd) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed converting public key to protobuf: %w", err) | ||
| } | ||
| trProto := prototrustroot.TransparencyLogInstance{ | ||
| BaseUrl: tl.BaseURL, | ||
| HashAlgorithm: hashAlgo, | ||
| PublicKey: publicKey, | ||
| LogId: &protocommon.LogId{ | ||
| KeyId: tl.ID, | ||
| }, | ||
| } | ||
|
|
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| return &trProto, nil | ||
| } | ||
|
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| func hashAlgorithmToProtobufHashAlgorithm(hashAlgorithm crypto.Hash) (protocommon.HashAlgorithm, error) { | ||
| switch hashAlgorithm { | ||
| case crypto.SHA256: | ||
| return protocommon.HashAlgorithm_SHA2_256, nil | ||
| case crypto.SHA384: | ||
| return protocommon.HashAlgorithm_SHA2_384, nil | ||
| case crypto.SHA512: | ||
| return protocommon.HashAlgorithm_SHA2_512, nil | ||
| case crypto.SHA3_256: | ||
| return protocommon.HashAlgorithm_SHA3_256, nil | ||
| case crypto.SHA3_384: | ||
| return protocommon.HashAlgorithm_SHA3_384, nil | ||
| default: | ||
| return 0, fmt.Errorf("unsupported hash algorithm for Merkle tree: %v", hashAlgorithm) | ||
| } | ||
| } | ||
|
|
||
| func publicKeyToProtobufPublicKey(publicKey crypto.PublicKey, start time.Time, end time.Time) (*protocommon.PublicKey, error) { | ||
| pkd := protocommon.PublicKey{ | ||
| ValidFor: &protocommon.TimeRange{ | ||
| Start: timestamppb.New(start), | ||
| }, | ||
| } | ||
|
|
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| if !end.IsZero() { | ||
| pkd.ValidFor.End = timestamppb.New(end) | ||
| } | ||
|
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| rawBytes, err := x509.MarshalPKIXPublicKey(publicKey) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed marshalling public key: %w", err) | ||
| } | ||
| pkd.RawBytes = rawBytes | ||
|
|
||
| switch p := publicKey.(type) { | ||
| case *ecdsa.PublicKey: | ||
| switch p.Curve { | ||
| case elliptic.P256(): | ||
| pkd.KeyDetails = protocommon.PublicKeyDetails_PKIX_ECDSA_P256_SHA_256 | ||
| case elliptic.P384(): | ||
| pkd.KeyDetails = protocommon.PublicKeyDetails_PKIX_ECDSA_P384_SHA_384 | ||
| case elliptic.P521(): | ||
| pkd.KeyDetails = protocommon.PublicKeyDetails_PKIX_ECDSA_P521_SHA_512 | ||
| default: | ||
| return nil, fmt.Errorf("unsupported curve for ecdsa key: %T", p.Curve) | ||
| } | ||
| case *rsa.PublicKey: | ||
| switch p.Size() * 8 { | ||
| case 2048: | ||
| pkd.KeyDetails = protocommon.PublicKeyDetails_PKIX_RSA_PKCS1V15_2048_SHA256 | ||
| case 3072: | ||
| pkd.KeyDetails = protocommon.PublicKeyDetails_PKIX_RSA_PKCS1V15_3072_SHA256 | ||
| case 4096: | ||
| pkd.KeyDetails = protocommon.PublicKeyDetails_PKIX_RSA_PKCS1V15_4096_SHA256 | ||
| default: | ||
| return nil, fmt.Errorf("unsupported public modulus for RSA key: %d", p.Size()) | ||
| } | ||
| case *ed25519.PublicKey: | ||
| pkd.KeyDetails = protocommon.PublicKeyDetails_PKIX_ED25519 | ||
| default: | ||
| return nil, fmt.Errorf("unknown public key type: %T", p) | ||
| } | ||
|
|
||
| return &pkd, nil | ||
| } |
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