-
Notifications
You must be signed in to change notification settings - Fork 21
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Add the ability to contruct TrustRoot from targets (#247)
* Add the ability to contruct TrustRoot from targets Signed-off-by: Slavek Kabrda <bkabrda@redhat.com> * Address review, fix linting issues Signed-off-by: Slavek Kabrda <bkabrda@redhat.com> * Fix test by stripping second fraction from input Signed-off-by: Slavek Kabrda <bkabrda@redhat.com> * Add an example, fix a public key reading error case Signed-off-by: Slavek Kabrda <bkabrda@redhat.com> * Address review Signed-off-by: Slavek Kabrda <bkabrda@redhat.com> * Address review, pull out sorting functionality in separate functions Signed-off-by: Slavek Kabrda <bkabrda@redhat.com> --------- Signed-off-by: Slavek Kabrda <bkabrda@redhat.com>
- Loading branch information
Showing
3 changed files
with
289 additions
and
1 deletion.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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 | ||
| } | ||
|
|
||
| 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) | ||
| }) | ||
| } | ||
|
|
||
| func sortTlogSlice(slc []*prototrustroot.TransparencyLogInstance) { | ||
| sort.Slice(slc, func(i, j int) bool { | ||
| iTime := time.Unix(0, 0) | ||
| jTime := time.Unix(0, 0) | ||
|
|
||
| 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() | ||
| } | ||
|
|
||
| return iTime.Before(jTime) | ||
| }) | ||
| } | ||
|
|
||
| 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}) | ||
|
|
||
| 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) | ||
| } | ||
|
|
||
| return &caProto, nil | ||
| } | ||
|
|
||
| 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, | ||
| }, | ||
| } | ||
|
|
||
| return &trProto, nil | ||
| } | ||
|
|
||
| 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), | ||
| }, | ||
| } | ||
|
|
||
| if !end.IsZero() { | ||
| pkd.ValidFor.End = timestamppb.New(end) | ||
| } | ||
|
|
||
| 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 | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters