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client.go
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client.go
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// Copyright 2023 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 client
import (
"bytes"
"crypto/tls"
"crypto/x509"
"fmt"
"io"
"net"
"net/http"
"os"
"time"
"github.com/digitorus/timestamp"
"github.com/pkg/errors"
)
// TimestampAuthorityClient should be implemented by clients that want to request timestamp responses
type TimestampAuthorityClient interface {
GetTimestampResponse(tsq []byte) ([]byte, error)
}
// TimestampAuthorityClient provides a client to query RFC 3161 timestamp authorities
type TimestampAuthorityClientImpl struct {
TimestampAuthorityClient
// URL is the path to the API to request timestamp responses
URL string
// CACert is the filepath to the PEM-encoded CA certificate for the connection to the TSA server
CACert string
// Cert is the filepath to the PEM-encoded certificate for the connection to the TSA server
Cert string
// Cert is the filepath to the PEM-encoded key corresponding to the certificate for the connection to the TSA server
Key string
// ServerName is the expected SAN value in the server's certificate - used for https://pkg.go.dev/crypto/tls#Config.ServerName
ServerName string
// Timeout is the request timeout
Timeout time.Duration
}
const defaultTimeout = 10 * time.Second
func getHTTPTransport(cacertFilename, certFilename, keyFilename, serverName string, timeout time.Duration) (http.RoundTripper, error) {
if timeout == 0 {
timeout = defaultTimeout
}
tr := &http.Transport{
TLSClientConfig: &tls.Config{
CipherSuites: []uint16{
// TLS 1.3 cipher suites.
tls.TLS_AES_128_GCM_SHA256,
tls.TLS_AES_256_GCM_SHA384,
tls.TLS_CHACHA20_POLY1305_SHA256,
},
MinVersion: tls.VersionTLS13,
SessionTicketsDisabled: true,
},
// the rest of default settings are copied verbatim from https://golang.org/pkg/net/http/#DefaultTransport
// to minimize surprises for the users.
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: timeout,
KeepAlive: 30 * time.Second,
DualStack: true,
}).DialContext,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
}
var pool *x509.CertPool
if cacertFilename != "" {
f, err := os.Open(cacertFilename)
if err != nil {
return nil, err
}
defer f.Close()
caCertBytes, err := io.ReadAll(f)
if err != nil {
return nil, fmt.Errorf("unable to read CA certs from %s: %w", cacertFilename, err)
}
pool = x509.NewCertPool()
if !pool.AppendCertsFromPEM(caCertBytes) {
return nil, fmt.Errorf("no valid CA certs found in %s", cacertFilename)
}
tr.TLSClientConfig.RootCAs = pool
}
if certFilename != "" && keyFilename != "" {
cert, err := tls.LoadX509KeyPair(certFilename, keyFilename)
if err != nil {
return nil, fmt.Errorf("unable to read CA certs from cert %s, key %s: %w",
certFilename, keyFilename, err)
}
tr.TLSClientConfig.Certificates = []tls.Certificate{cert}
}
if serverName != "" {
tr.TLSClientConfig.ServerName = serverName
}
return tr, nil
}
// GetTimestampResponse sends a timestamp query to a timestamp authority, returning a timestamp response.
// The query and response are defined by RFC 3161.
func (t *TimestampAuthorityClientImpl) GetTimestampResponse(tsq []byte) ([]byte, error) {
client := http.Client{
Timeout: t.Timeout,
}
// if mTLS-related fields are set, create a custom Transport for the Client
if t.CACert != "" || t.Cert != "" {
tr, err := getHTTPTransport(t.CACert, t.Cert, t.Key, t.ServerName, t.Timeout)
if err != nil {
return nil, err
}
client.Transport = tr
}
req, err := http.NewRequest("POST", t.URL, bytes.NewReader(tsq))
if err != nil {
return nil, errors.Wrap(err, "error creating HTTP request")
}
req.Header.Set("Content-Type", "application/timestamp-query")
tsr, err := client.Do(req)
if err != nil {
return nil, errors.Wrap(err, "error making request to timestamp authority")
}
if tsr.StatusCode != 200 && tsr.StatusCode != 201 {
return nil, fmt.Errorf("request to timestamp authority failed with status code %d", tsr.StatusCode)
}
resp, err := io.ReadAll(tsr.Body)
if err != nil {
return nil, errors.Wrap(err, "error reading timestamp response")
}
// validate that the timestamp response is parseable
ts, err := timestamp.ParseResponse(resp)
if err != nil {
return nil, err
}
fmt.Fprintln(os.Stderr, "Timestamp fetched with time: ", ts.Time)
return resp, nil
}
func NewTSAClient(url string) *TimestampAuthorityClientImpl {
return &TimestampAuthorityClientImpl{URL: url, Timeout: defaultTimeout}
}
func NewTSAClientMTLS(url, cacert, cert, key, serverName string) *TimestampAuthorityClientImpl {
return &TimestampAuthorityClientImpl{
URL: url,
CACert: cacert,
Cert: cert,
Key: key,
ServerName: serverName,
Timeout: defaultTimeout,
}
}