forked from ghostunnel/ghostunnel
-
Notifications
You must be signed in to change notification settings - Fork 0
/
tls.go
130 lines (111 loc) · 3.01 KB
/
tls.go
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
/*-
* 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"
"io/ioutil"
"os"
"sync/atomic"
"unsafe"
certigo "github.com/square/certigo/lib"
)
// certificate wraps a TLS certificate in a reloadable way
type certificate struct {
keystorePath, keystorePass string
cached unsafe.Pointer
}
// Build reloadable certificate
func buildCertificate(keystorePath, keystorePass string) (*certificate, error) {
cert := &certificate{keystorePath, keystorePass, nil}
err := cert.reload()
if err != nil {
return nil, err
}
return cert, nil
}
// Retrieve actual certificate
func (c *certificate) getCertificate(clientHello *tls.ClientHelloInfo) (*tls.Certificate, error) {
return (*tls.Certificate)(atomic.LoadPointer(&c.cached)), nil
}
// Reload certificate
func (c *certificate) reload() error {
keystore, err := os.Open(c.keystorePath)
if err != nil {
return err
}
var pemBlocks []*pem.Block
err = certigo.ReadAsPEMFromFiles(
[]*os.File{keystore},
"",
func(prompt string) string {
return c.keystorePass
},
func(block *pem.Block) {
pemBlocks = append(pemBlocks, block)
})
if err != nil {
return err
}
var pemBytes []byte
for _, block := range pemBlocks {
pemBytes = append(pemBytes, pem.EncodeToMemory(block)...)
}
certAndKey, err := tls.X509KeyPair(pemBytes, pemBytes)
if err != nil {
return err
}
certAndKey.Leaf, err = x509.ParseCertificate(certAndKey.Certificate[0])
if err != nil {
return err
}
atomic.StorePointer(&c.cached, unsafe.Pointer(&certAndKey))
return nil
}
func caBundle(caBundlePath string) (*x509.CertPool, error) {
if caBundlePath == "" {
return x509.SystemCertPool()
}
caBundleBytes, err := ioutil.ReadFile(caBundlePath)
if err != nil {
return nil, err
}
bundle := x509.NewCertPool()
bundle.AppendCertsFromPEM(caBundleBytes)
return bundle, nil
}
// buildConfig reads command-line options and builds a tls.Config
func buildConfig(caBundlePath string) (*tls.Config, error) {
ca, err := caBundle(caBundlePath)
if err != nil {
return nil, err
}
return &tls.Config{
// Certificates
RootCAs: ca,
ClientCAs: ca,
PreferServerCipherSuites: true,
ClientAuth: tls.RequireAndVerifyClientCert,
MinVersion: tls.VersionTLS12,
CipherSuites: []uint16{
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
},
}, nil
}