1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
// Copyright 2021 Google Inc. 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 testing
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"fmt"
"log"
"os"
"time"
"github.com/google/martian/v3/cybervillains"
"github.com/google/martian/v3/mitm"
"google.golang.org/grpc/credentials"
)
var (
// CA is the certificate authority. It uses the Cybervillains key pair.
CA *x509.Certificate
// CAKey is the private key of the certificate authority.
CAKey crypto.PrivateKey
// RootCAs is a certificate pool containing `CA`.
RootCAs *x509.CertPool
// ClientTLS is a set of transport credentials to use with chains signed by `CA`.
ClientTLS credentials.TransportCredentials
// Localhost is a certificate for "localhost" signed by `CA`.
Localhost *tls.Certificate
)
func init() {
var err error
CA, CAKey, err = initCA()
if err != nil {
log.Fatalf("Error initializing Cybervillains CA: %v", err)
}
RootCAs = x509.NewCertPool()
RootCAs.AddCert(CA)
ClientTLS = credentials.NewClientTLSFromCert(RootCAs, "")
Localhost, err = initLocalhostCert(CA, CAKey)
if err != nil {
log.Fatalf("Error creating localhost server certificate: %v", err)
}
}
func initCA() (*x509.Certificate, crypto.PrivateKey, error) {
chain, err := tls.X509KeyPair([]byte(cybervillains.Cert), []byte(cybervillains.Key))
if err != nil {
return nil, nil, fmt.Errorf("creating Cybervillains root: %w", err)
}
cert, err := x509.ParseCertificate(chain.Certificate[0])
if err != nil {
return nil, nil, fmt.Errorf("parsing Cybervillains certificate: %w", err)
}
return cert, chain.PrivateKey, nil
}
func initLocalhostCert(ca *x509.Certificate, caPriv crypto.PrivateKey) (*tls.Certificate, error) {
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, fmt.Errorf("generating random key: %w", err)
}
// Subject Key Identifier support for end entity certificate.
// https://www.ietf.org/rfc/rfc3280.txt (section 4.2.1.2)
pkixpub, err := x509.MarshalPKIXPublicKey(priv.Public())
if err != nil {
return nil, fmt.Errorf("marshalling public key: %w", err)
}
hasher := sha256.New()
hasher.Write(pkixpub)
keyID := hasher.Sum(nil)
serial, err := rand.Int(rand.Reader, mitm.MaxSerialNumber)
if err != nil {
return nil, fmt.Errorf("generating serial number: %w", err)
}
hostname, err := os.Hostname()
if err != nil {
return nil, fmt.Errorf("getting hostname for creating cert: %w", err)
}
tmpl := &x509.Certificate{
SerialNumber: serial,
Subject: pkix.Name{
CommonName: hostname,
Organization: []string{"Martian Proxy"},
},
SubjectKeyId: keyID,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
NotBefore: time.Now().Add(-time.Hour),
NotAfter: time.Now().Add(time.Hour),
DNSNames: []string{hostname},
}
der, err := x509.CreateCertificate(rand.Reader, tmpl, ca, priv.Public(), caPriv)
if err != nil {
return nil, fmt.Errorf("creating X509 server certificate: %w", err)
}
x509c, err := x509.ParseCertificate(der)
if err != nil {
return nil, fmt.Errorf("parsing DER encoded certificate: %w", err)
}
return &tls.Certificate{
Certificate: [][]byte{x509c.Raw, ca.Raw},
PrivateKey: priv,
Leaf: x509c,
}, nil
}
|
