forked from ghostunnel/ghostunnel
/
tls.go
99 lines (86 loc) · 2.89 KB
/
tls.go
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/*-
* Copyright 2015 Square Inc.
*
* 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 main
import (
"crypto/tls"
"crypto/x509"
"encoding/pem"
"fmt"
"io/ioutil"
"strings"
"golang.org/x/crypto/pkcs12"
)
// parseKeystore takes a PKCS12 keystore and converts it into a series of
// serialized PEM blocks for certificates/private key. The keystore is expected
// to contain exactly one private key and one or more certificates.
func parseKeystore(data []byte, password string) (certs, key []byte, err error) {
blocks, err := pkcs12.ToPEM(data, password)
for _, block := range blocks {
if strings.Contains(block.Type, "PRIVATE KEY") {
if key != nil {
return nil, nil, fmt.Errorf("invalid keystore: found multiple private keys in pkcs12 file")
}
key = pem.EncodeToMemory(block)
} else if block.Type == "CERTIFICATE" {
certs = append(certs, pem.EncodeToMemory(block)...)
certs = append(certs, '\n')
}
}
return
}
// buildConfig reads command-line options and builds a tls.Config
func buildConfig(keystorePath, keystorePass, caBundlePath string) (*tls.Config, error) {
caBundleBytes, err := ioutil.ReadFile(caBundlePath)
if err != nil {
return nil, err
}
caBundle := x509.NewCertPool()
caBundle.AppendCertsFromPEM(caBundleBytes)
keystoreBytes, err := ioutil.ReadFile(keystorePath)
if err != nil {
return nil, err
}
certPEM, keyPEM, err := parseKeystore(keystoreBytes, keystorePass)
if err != nil {
return nil, fmt.Errorf("unable to parse keystore: %s", err)
}
certAndKey, err := tls.X509KeyPair(certPEM, keyPEM)
if err != nil {
return nil, fmt.Errorf("unable to parse key pair: %s", err)
}
certAndKey.Leaf, err = x509.ParseCertificate(certAndKey.Certificate[0])
if err != nil {
return nil, fmt.Errorf("unable to parse leaf cert: %s", err)
}
return &tls.Config{
// Certificates
Certificates: []tls.Certificate{certAndKey},
RootCAs: caBundle,
ClientCAs: caBundle,
// We want MinVersion to be tls.Version12 eventually, but the version
// of Python running on Travis-CI by default only does TLS v1.1 right
// now unfortunately.
ClientAuth: tls.RequireAndVerifyClientCert,
MinVersion: tls.VersionTLS11,
CipherSuites: []uint16{
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
tls.TLS_RSA_WITH_AES_128_CBC_SHA,
tls.TLS_RSA_WITH_AES_256_CBC_SHA,
},
}, nil
}