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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 mock
import (
"bytes"
"crypto"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"encoding/asn1"
"fmt"
"io"
"time"
"github.com/go-openapi/runtime"
"github.com/pkg/errors"
"github.com/digitorus/timestamp"
"github.com/sigstore/sigstore/pkg/cryptoutils"
"github.com/sigstore/sigstore/pkg/signature"
"github.com/sigstore/timestamp-authority/pkg/generated/client"
ts "github.com/sigstore/timestamp-authority/pkg/generated/client/timestamp"
"github.com/sigstore/timestamp-authority/pkg/signer"
)
// TSAClient creates RFC3161 timestamps and implements client.TimestampAuthority.
// Messages to sign can either be provided in the initializer or through the request.
// Time can be provided in the initializer, or defaults to time.Now().
// All other timestamp parameters are hardcoded.
type TSAClient struct {
Signer crypto.Signer
CertChain []*x509.Certificate
CertChainPEM string
Time time.Time
Message []byte
}
// TSAClientOptions provide customization for the mock TSA client.
type TSAClientOptions struct {
// Time is an optional timestamp. Default is time.Now().
Time time.Time
// Message is the pre-hashed message to sign over, typically a raw signature.
Message []byte
// Signer is an optional signer created out of band. Client creates one if not set.
Signer crypto.Signer
}
func NewTSAClient(o TSAClientOptions) (*client.TimestampAuthority, error) {
sv := o.Signer
if sv == nil {
var err error
sv, _, err = signature.NewECDSASignerVerifier(elliptic.P256(), rand.Reader, crypto.SHA256)
if err != nil {
return nil, err
}
}
certChain, err := signer.NewTimestampingCertWithChain(sv)
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 &client.TimestampAuthority{
Timestamp: &TSAClient{
Signer: sv,
CertChain: certChain,
CertChainPEM: string(certChainPEM),
Time: o.Time,
Message: o.Message,
},
}, nil
}
func (c *TSAClient) GetTimestampCertChain(_ *ts.GetTimestampCertChainParams, _ ...ts.ClientOption) (*ts.GetTimestampCertChainOK, error) {
return &ts.GetTimestampCertChainOK{Payload: c.CertChainPEM}, nil
}
func (c *TSAClient) GetTimestampResponse(params *ts.GetTimestampResponseParams, w io.Writer, _ ...ts.ClientOption) (*ts.GetTimestampResponseCreated, error) {
var hashAlg crypto.Hash
var hashedMessage []byte
if params.Request != nil {
requestBytes, err := io.ReadAll(params.Request)
if err != nil {
return nil, err
}
req, err := timestamp.ParseRequest(requestBytes)
if err != nil {
return nil, err
}
hashAlg = req.HashAlgorithm
hashedMessage = req.HashedMessage
} else {
hashAlg = crypto.SHA256
h := hashAlg.New()
h.Write(c.Message)
hashedMessage = h.Sum(nil)
}
nonce, err := cryptoutils.GenerateSerialNumber()
if err != nil {
return nil, err
}
duration, _ := time.ParseDuration("1s")
tsStruct := timestamp.Timestamp{
HashAlgorithm: hashAlg,
HashedMessage: hashedMessage,
Nonce: nonce,
Policy: asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 57264, 2},
Ordering: false,
Accuracy: duration,
Qualified: false,
AddTSACertificate: true,
}
if c.Time.IsZero() {
tsStruct.Time = time.Now()
} else {
tsStruct.Time = c.Time
}
resp, err := tsStruct.CreateResponseWithOpts(c.CertChain[0], c.Signer, crypto.SHA256)
if err != nil {
return nil, err
}
// write response to provided buffer and payload
if w != nil {
_, err := w.Write(resp)
if err != nil {
return nil, err
}
}
return &ts.GetTimestampResponseCreated{Payload: bytes.NewBuffer(resp)}, nil
}
func (c *TSAClient) SetTransport(_ runtime.ClientTransport) {
// nothing to do
}
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