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verify.go
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verify.go
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// 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 verify
import (
"context"
"encoding/pem"
"fmt"
"io"
"os"
gogit "github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing"
cosignopts "github.com/sigstore/cosign/v2/cmd/cosign/cli/options"
"github.com/sigstore/cosign/v2/pkg/cosign"
"github.com/sigstore/gitsign/internal"
"github.com/sigstore/gitsign/internal/config"
"github.com/sigstore/gitsign/internal/gitsign"
"github.com/sigstore/gitsign/pkg/git"
"github.com/sigstore/sigstore/pkg/cryptoutils"
"github.com/spf13/cobra"
)
type options struct {
Config *config.Config
cosignopts.CertVerifyOptions
}
func (o *options) AddFlags(cmd *cobra.Command) {
o.CertVerifyOptions.AddFlags(cmd)
}
func (o *options) Run(w io.Writer, args []string) error {
ctx := context.Background()
repo, err := gogit.PlainOpenWithOptions(".", &gogit.PlainOpenOptions{
DetectDotGit: true,
})
if err != nil {
return err
}
revision := "HEAD"
if len(args) > 0 {
revision = args[0]
}
h, err := repo.ResolveRevision(plumbing.Revision(revision))
if err != nil {
return fmt.Errorf("error resolving commit object: %w", err)
}
c, err := repo.CommitObject(*h)
if err != nil {
return fmt.Errorf("error reading commit object: %w", err)
}
sig := []byte(c.PGPSignature)
p, _ := pem.Decode(sig)
if p == nil || p.Type != "SIGNED MESSAGE" {
return fmt.Errorf("unsupported signature type")
}
c2 := new(plumbing.MemoryObject)
if err := c.EncodeWithoutSignature(c2); err != nil {
return err
}
r, err := c2.Reader()
if err != nil {
return err
}
defer r.Close()
data, err := io.ReadAll(r)
if err != nil {
return err
}
v, err := gitsign.NewVerifierWithCosignOpts(ctx, o.Config, &o.CertVerifyOptions)
if err != nil {
return err
}
summary, err := v.Verify(ctx, data, sig, true)
if err != nil {
return err
}
PrintSummary(os.Stdout, summary)
return nil
}
func PrintSummary(w io.Writer, summary *git.VerificationSummary) {
fpr := internal.CertHexFingerprint(summary.Cert)
fmt.Fprintln(w, "tlog index:", *summary.LogEntry.LogIndex)
fmt.Fprintf(w, "gitsign: Signature made using certificate ID 0x%s | %v\n", fpr, summary.Cert.Issuer)
ce := cosign.CertExtensions{Cert: summary.Cert}
fmt.Fprintf(w, "gitsign: Good signature from %v(%s)\n", cryptoutils.GetSubjectAlternateNames(summary.Cert), ce.GetIssuer())
for _, c := range summary.Claims {
fmt.Fprintf(w, "%s: %t\n", string(c.Key), c.Value)
}
}
func New(cfg *config.Config) *cobra.Command {
o := &options{Config: cfg}
cmd := &cobra.Command{
Use: "verify [commit]",
Args: cobra.MaximumNArgs(1),
SilenceUsage: true,
Short: "Verify a commit",
Long: `Verify a commit.
verify verifies a commit against a set of certificate claims.
This should generally be used over git verify-commit, since verify will
check the identity included in the signature's certificate.
If no revision is specified, HEAD is used.`,
RunE: func(cmd *cobra.Command, args []string) error {
// Simulate unknown flag errors.
if o.Cert != "" {
return fmt.Errorf("unknown flag: --certificate")
}
if o.CertChain != "" {
return fmt.Errorf("unknown flag: --certificate-chain")
}
return o.Run(os.Stdout, args)
},
}
o.AddFlags(cmd)
// Hide flags we don't implement.
// --certificate: The cert should always come from the commit.
_ = cmd.Flags().MarkHidden("certificate")
// --certificate-chain: We only support reading from a TUF root at the moment.
// TODO: add support for this.
_ = cmd.Flags().MarkHidden("certificate-chain")
return cmd
}