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// Copyright 2019 Google LLC. All Rights Reserved.
//
// 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 submission
import (
"context"
"crypto/sha256"
"fmt"
ct "github.com/google/certificate-transparency-go"
"github.com/google/certificate-transparency-go/client"
"github.com/google/certificate-transparency-go/loglist3"
"github.com/google/certificate-transparency-go/tls"
"github.com/google/certificate-transparency-go/x509util"
)
type rootInfo struct {
raw []byte
filename string
}
// Stub for AddLogCLient interface
type stubLogClient struct {
logURL string
rootsCerts map[string][]rootInfo
}
func (m stubLogClient) AddChain(ctx context.Context, chain []ct.ASN1Cert) (*ct.SignedCertificateTimestamp, error) {
if _, ok := m.rootsCerts[m.logURL]; ok {
return testSCT(m.logURL), nil
}
return nil, fmt.Errorf("log %q has no roots", m.logURL)
}
func (m stubLogClient) AddPreChain(ctx context.Context, chain []ct.ASN1Cert) (*ct.SignedCertificateTimestamp, error) {
if _, ok := m.rootsCerts[m.logURL]; ok {
return testSCT(m.logURL), nil
}
return nil, fmt.Errorf("log %q has no roots", m.logURL)
}
func (m stubLogClient) GetAcceptedRoots(ctx context.Context) ([]ct.ASN1Cert, error) {
roots := []ct.ASN1Cert{}
certInfos, ok := m.rootsCerts[m.logURL]
if !ok {
return roots, nil
}
for _, certInfo := range certInfos {
if len(certInfo.raw) > 0 {
roots = append(roots, ct.ASN1Cert{Data: certInfo.raw})
continue
}
roots = append(roots, ct.ASN1Cert{Data: readCertFile(certInfo.filename)})
}
return roots, nil
}
// readCertFile returns the first certificate it finds in file provided.
func readCertFile(filename string) []byte {
data, err := x509util.ReadPossiblePEMFile(filename, "CERTIFICATE")
if err != nil {
return nil
}
return data[0]
}
// TestSCT builds a mock SCT for given logURL.
func testSCT(logURL string) *ct.SignedCertificateTimestamp {
var keyID [sha256.Size]byte
copy(keyID[:], logURL)
return &ct.SignedCertificateTimestamp{
SCTVersion: ct.V1,
LogID: ct.LogID{KeyID: keyID},
Timestamp: 1234,
Extensions: []byte{},
Signature: ct.DigitallySigned{
Algorithm: tls.SignatureAndHashAlgorithm{
Hash: tls.SHA256,
Signature: tls.ECDSA,
},
},
}
}
func newRootedStubLogClient(log *loglist3.Log, rCerts map[string][]rootInfo) (client.AddLogClient, error) {
return stubLogClient{logURL: log.URL, rootsCerts: rCerts}, nil
}
func newEmptyStubLogClient(log *loglist3.Log) (client.AddLogClient, error) {
return newRootedStubLogClient(log, map[string][]rootInfo{})
}
// NewStubLogClient is builder for log-client stubs. Used for dry-runs and
// testing.
func NewStubLogClient(log *loglist3.Log) (client.AddLogClient, error) {
return stubLogClient{logURL: log.URL, rootsCerts: map[string][]rootInfo{log.URL: {}}}, nil
}
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