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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 api
import (
"bytes"
"context"
"crypto"
"crypto/x509"
"fmt"
"os"
"path/filepath"
"github.com/pkg/errors"
"github.com/spf13/viper"
"github.com/sigstore/sigstore/pkg/cryptoutils"
"github.com/sigstore/timestamp-authority/pkg/log"
"github.com/sigstore/timestamp-authority/pkg/signer"
tsx509 "github.com/sigstore/timestamp-authority/pkg/x509"
)
type API struct {
tsaSigner crypto.Signer // the signer to use for timestamping
tsaSignerHash crypto.Hash // hash algorithm used to hash pre-signed timestamps
certChain []*x509.Certificate // timestamping cert chain
certChainPem string // PEM encoded timestamping cert chain
}
func NewAPI() (*API, error) {
ctx := context.Background()
tsaSignerHash, err := signer.HashToAlg(viper.GetString("timestamp-signer-hash"))
if err != nil {
return nil, errors.Wrap(err, "error getting hash")
}
tsaSigner, err := signer.NewCryptoSigner(ctx, tsaSignerHash,
viper.GetString("timestamp-signer"),
viper.GetString("kms-key-resource"),
viper.GetString("tink-key-resource"), viper.GetString("tink-keyset-path"),
viper.GetString("tink-hcvault-token"),
viper.GetString("file-signer-key-path"), viper.GetString("file-signer-passwd"))
if err != nil {
return nil, errors.Wrap(err, "getting new tsa signer")
}
var certChain []*x509.Certificate
// KMS, Tink and File signers require a provided certificate chain
if viper.GetString("timestamp-signer") != signer.MemoryScheme {
certChainPath := viper.GetString("certificate-chain-path")
data, err := os.ReadFile(filepath.Clean(certChainPath))
if err != nil {
return nil, err
}
certChain, err = cryptoutils.LoadCertificatesFromPEM(bytes.NewReader(data))
if err != nil {
return nil, err
}
if err := tsx509.VerifyCertChain(certChain, tsaSigner); err != nil {
return nil, err
}
} else {
// Generate an in-memory TSA certificate chain
certChain, err = signer.NewTimestampingCertWithChain(tsaSigner)
if err != nil {
return nil, errors.Wrap(err, "generating timestamping cert chain")
}
}
certChainPEM, err := cryptoutils.MarshalCertificatesToPEM(certChain)
if err != nil {
return nil, fmt.Errorf("marshal certificates to PEM: %w", err)
}
return &API{
tsaSigner: tsaSigner,
tsaSignerHash: tsaSignerHash,
certChain: certChain,
certChainPem: string(certChainPEM),
}, nil
}
var (
api *API
)
func ConfigureAPI() {
var err error
api, err = NewAPI()
if err != nil {
log.Logger.Panic(err)
}
}
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