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devkeys.go
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devkeys.go
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// Copyright 2024 Google LLC
//
// 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 devkeys provides test-only pregenerated and signed root and signer keys.
package devkeys
import (
"os"
"path"
pb "github.com/google/gce-tcb-verifier/proto/certificates"
"go.uber.org/multierr"
"google.golang.org/protobuf/encoding/prototext"
_ "embed"
)
var (
// RootPEM contains a PEM-encoded private key generated by the bootstrapping process.
//go:embed root.pem
RootPEM []byte
// RootCert contains a DER-encoded x509 certificate of RootPEM, self-signed as a CA.
//go:embed root.crt
RootCert []byte
// PrimarySigningKeyPEM contains a PEM-encoded private key for signing binaries, generated by the
// bootstrapping process.
//go:embed primarySigningKey.pem
PrimarySigningKeyPEM []byte
// PrimarySigningKeyCert contains a DER-encoded root-signed x509 certificate for the signer key.
//go:embed primarySigningKey.crt
PrimarySigningKeyCert []byte
// KeyManifest contains a textproto manifest with paths to and names of the root and primary keys,
// and their certs.
//go:embed keyManifest.textproto
KeyManifest []byte
)
// Options provides parameters to where to write dev keys and certificate files, and how to populate
// the keyManifest.textproto.
type Options struct {
KeyDir string
CertRoot string
CertDir string
Bucket string
RootKeyVersionName string
PrimarySigningKeyVersionName string
}
func retargetKeyManifest(opts *Options) ([]byte, error) {
manifest := &pb.GCECertificateManifest{}
prototext.Unmarshal(KeyManifest, manifest)
// Swap out "signer_certs" directory with opts.CertDir, and key version names if specified.
if opts.RootKeyVersionName != "" {
manifest.PrimaryRootKeyVersionName = opts.RootKeyVersionName
}
if opts.PrimarySigningKeyVersionName != "" {
manifest.PrimarySigningKeyVersionName = opts.PrimarySigningKeyVersionName
}
for _, entry := range manifest.Entries {
isRoot := entry.KeyVersionName == "root"
if opts.RootKeyVersionName != "" && isRoot {
entry.KeyVersionName = opts.RootKeyVersionName
}
// The root key certificate is at root_path, so it's not retargeted.
if isRoot {
continue
}
if opts.PrimarySigningKeyVersionName != "" && entry.KeyVersionName == "primarySigningKey" {
entry.KeyVersionName = opts.PrimarySigningKeyVersionName
}
entry.ObjectPath = path.Join(opts.CertDir, path.Base(entry.GetObjectPath()))
}
result, err := prototext.MarshalOptions{Multiline: true}.Marshal(manifest)
if err != nil {
return nil, err
}
return result, nil
}
// DumpTo writes the embedded files to a directory so they can be used for tests that need file
// paths.
func DumpTo(opts *Options) error {
if err := os.MkdirAll(path.Join(opts.CertRoot, opts.Bucket, opts.CertDir), 0755); err != nil {
return err
}
manifest, err := retargetKeyManifest(opts)
if err != nil {
return err
}
rootPEM := path.Join(opts.KeyDir, "root.pem")
primarySigningKeyPEM := path.Join(opts.KeyDir, "primarySigningKey.pem")
keyManifest := path.Join(opts.CertRoot, opts.Bucket, "keyManifest.textproto")
rootCert := path.Join(opts.CertRoot, opts.Bucket, "root.crt")
primarySigningKeyCert := path.Join(opts.CertRoot, opts.Bucket, opts.CertDir, "primarySigningKey.crt")
return multierr.Combine(os.WriteFile(keyManifest, manifest, 0644),
os.WriteFile(rootPEM, RootPEM, 0644),
os.WriteFile(rootCert, RootCert, 0644),
os.WriteFile(primarySigningKeyPEM, PrimarySigningKeyPEM, 0644),
os.WriteFile(primarySigningKeyCert, PrimarySigningKeyCert, 0644))
}