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//
// Copyright 2022 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 tuf
import (
"context"
"crypto/x509"
"encoding/json"
"net/http"
"net/http/httptest"
"os"
"path/filepath"
"testing"
"github.com/sigstore/sigstore/pkg/cryptoutils"
"github.com/sigstore/sigstore/pkg/signature"
"github.com/sigstore/sigstore/pkg/signature/options"
"github.com/theupdateframework/go-tuf"
)
type TestSigstoreRoot struct {
Rekor signature.Verifier
FulcioCertificate *x509.Certificate
// TODO: Include a CTFE key if/when cosign verifies SCT.
}
// This creates a new sigstore TUF repo whose signers can be used to create dynamic
// signed Rekor entries.
func NewSigstoreTufRepo(t *testing.T, root TestSigstoreRoot) (tuf.LocalStore, *tuf.Repo) {
td := t.TempDir()
ctx := context.Background()
remote := tuf.FileSystemStore(td, nil)
r, err := tuf.NewRepo(remote)
if err != nil {
t.Error(err)
}
if err := r.Init(false); err != nil {
t.Error(err)
}
for _, role := range []string{"root", "targets", "snapshot", "timestamp"} {
if _, err := r.GenKey(role); err != nil {
t.Error(err)
}
}
targetsPath := filepath.Join(td, "staged", "targets")
if err := os.MkdirAll(filepath.Dir(targetsPath), 0o755); err != nil {
t.Error(err)
}
// Add the rekor key target
pk, err := root.Rekor.PublicKey(options.WithContext(ctx))
if err != nil {
t.Error(err)
}
b, err := x509.MarshalPKIXPublicKey(pk)
if err != nil {
t.Error(err)
}
rekorPath := "rekor.pub"
rekorData := cryptoutils.PEMEncode(cryptoutils.PublicKeyPEMType, b)
if err := os.WriteFile(filepath.Join(targetsPath, rekorPath), rekorData, 0o600); err != nil {
t.Error(err)
}
scmRekor, err := json.Marshal(&sigstoreCustomMetadata{Sigstore: customMetadata{Usage: Rekor, Status: Active}})
if err != nil {
t.Error(err)
}
if err := r.AddTarget("rekor.pub", scmRekor); err != nil {
t.Error(err)
}
// Add Fulcio Certificate information.
fulcioPath := "fulcio.crt.pem"
fulcioData := cryptoutils.PEMEncode(cryptoutils.CertificatePEMType, root.FulcioCertificate.Raw)
if err := os.WriteFile(filepath.Join(targetsPath, fulcioPath), fulcioData, 0o600); err != nil {
t.Error(err)
}
scmFulcio, err := json.Marshal(&sigstoreCustomMetadata{Sigstore: customMetadata{Usage: Fulcio, Status: Active}})
if err != nil {
t.Error(err)
}
if err := r.AddTarget(fulcioPath, scmFulcio); err != nil {
t.Error(err)
}
if err := r.Snapshot(); err != nil {
t.Error(err)
}
if err := r.Timestamp(); err != nil {
t.Error(err)
}
if err := r.Commit(); err != nil {
t.Error(err)
}
// Serve remote repository.
s := httptest.NewServer(http.FileServer(http.Dir(filepath.Join(td, "repository"))))
defer s.Close()
// Initialize with custom root.
tufRoot := t.TempDir()
t.Setenv("TUF_ROOT", tufRoot)
meta, err := remote.GetMeta()
if err != nil {
t.Error(err)
}
rootBytes, ok := meta["root.json"]
if !ok {
t.Error(err)
}
resetForTests()
if err := Initialize(ctx, s.URL, rootBytes); err != nil {
t.Error(err)
}
t.Cleanup(func() {
resetForTests()
})
return remote, r
}
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