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Add go-git based signer implementation. (#454)
Adds a git.Signer implementation + e2e test to demonstrate how signing is done. Verify still WIP upstream, so commit marshalling + verification still done manually for now. Signed-off-by: Billy Lynch <billy@chainguard.dev>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| // 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. | ||
|
|
||
| //go:build e2e | ||
| // +build e2e | ||
|
|
||
| package e2e | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "os" | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/go-git/go-billy/v5/memfs" | ||
| "github.com/go-git/go-git/v5" | ||
| "github.com/go-git/go-git/v5/plumbing/object" | ||
| "github.com/go-git/go-git/v5/storage/memory" | ||
| "github.com/sigstore/cosign/v2/pkg/providers" | ||
| "github.com/sigstore/gitsign/internal/git/gittest" | ||
| "github.com/sigstore/gitsign/pkg/fulcio" | ||
| gsgit "github.com/sigstore/gitsign/pkg/git" | ||
| "github.com/sigstore/gitsign/pkg/gitsign" | ||
| "github.com/sigstore/gitsign/pkg/rekor" | ||
| "github.com/sigstore/sigstore/pkg/oauth" | ||
| "github.com/sigstore/sigstore/pkg/oauthflow" | ||
|
|
||
| // Enable OIDC providers | ||
| _ "github.com/sigstore/cosign/v2/pkg/providers/all" | ||
| ) | ||
|
|
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| func TestSign(t *testing.T) { | ||
| ctx := context.Background() | ||
|
|
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| var flow oauthflow.TokenGetter = &oauthflow.InteractiveIDTokenGetter{ | ||
| HTMLPage: oauth.InteractiveSuccessHTML, | ||
| } | ||
| if providers.Enabled(ctx) { | ||
| // If automatic token provisioning is enabled, use it. | ||
| token, err := providers.Provide(ctx, "sigstore") | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| flow = &oauthflow.StaticTokenGetter{ | ||
| RawToken: token, | ||
| } | ||
| } | ||
| fulcio, err := fulcio.NewClient("https://fulcio.sigstore.dev", fulcio.OIDCOptions{ | ||
| ClientID: "sigstore", | ||
| Issuer: "https://oauth2.sigstore.dev/auth", | ||
| TokenGetter: flow, | ||
| }) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| rekor, err := rekor.NewWithOptions(ctx, "https://rekor.sigstore.dev") | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| signer, err := gitsign.NewSigner(ctx, fulcio, rekor) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
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| // Make a commit + sign it | ||
| storage := memory.NewStorage() | ||
| repo, err := git.Init(storage, memfs.New()) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| w, err := repo.Worktree() | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| sha, err := w.Commit("example commit", &git.CommitOptions{ | ||
| Author: &object.Signature{ | ||
| Name: "John Doe", | ||
| Email: "john@example.com", | ||
| When: time.UnixMicro(1234567890).UTC(), | ||
| }, | ||
| Signer: signer, | ||
| AllowEmptyCommits: true, | ||
| }) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| commit, err := repo.CommitObject(sha) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| body := gittest.MarshalCommitBody(t, commit) | ||
| sig := []byte(commit.PGPSignature) | ||
|
|
||
| // Verify the commit | ||
| verifier, err := gsgit.NewDefaultVerifier(ctx) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| summary, err := gsgit.Verify(ctx, verifier, rekor, body, sig, true) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| enc := json.NewEncoder(os.Stdout) | ||
| enc.SetIndent("", " ") | ||
| enc.Encode(summary.LogEntry) | ||
| } |
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