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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
// Copyright 2015 Matthew Holt and The Caddy 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 caddypki
import (
"bytes"
"crypto"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"io/ioutil"
"strings"
)
func pemDecodeSingleCert(pemDER []byte) (*x509.Certificate, error) {
pemBlock, remaining := pem.Decode(pemDER)
if pemBlock == nil {
return nil, fmt.Errorf("no PEM block found")
}
if len(remaining) > 0 {
return nil, fmt.Errorf("input contained more than a single PEM block")
}
if pemBlock.Type != "CERTIFICATE" {
return nil, fmt.Errorf("expected PEM block type to be CERTIFICATE, but got '%s'", pemBlock.Type)
}
return x509.ParseCertificate(pemBlock.Bytes)
}
func pemEncodeCert(der []byte) ([]byte, error) {
return pemEncode("CERTIFICATE", der)
}
// pemEncodePrivateKey marshals a EC or RSA private key into a PEM-encoded array of bytes.
// TODO: this is the same thing as in certmagic. Should we reuse that code somehow? It's unexported.
func pemEncodePrivateKey(key crypto.PrivateKey) ([]byte, error) {
var pemType string
var keyBytes []byte
switch key := key.(type) {
case *ecdsa.PrivateKey:
var err error
pemType = "EC"
keyBytes, err = x509.MarshalECPrivateKey(key)
if err != nil {
return nil, err
}
case *rsa.PrivateKey:
pemType = "RSA"
keyBytes = x509.MarshalPKCS1PrivateKey(key)
case *ed25519.PrivateKey:
var err error
pemType = "ED25519"
keyBytes, err = x509.MarshalPKCS8PrivateKey(key)
if err != nil {
return nil, err
}
default:
return nil, fmt.Errorf("unsupported key type: %T", key)
}
return pemEncode(pemType+" PRIVATE KEY", keyBytes)
}
// pemDecodePrivateKey loads a PEM-encoded ECC/RSA private key from an array of bytes.
// Borrowed from Go standard library, to handle various private key and PEM block types.
// https://github.com/golang/go/blob/693748e9fa385f1e2c3b91ca9acbb6c0ad2d133d/src/crypto/tls/tls.go#L291-L308
// https://github.com/golang/go/blob/693748e9fa385f1e2c3b91ca9acbb6c0ad2d133d/src/crypto/tls/tls.go#L238)
// TODO: this is the same thing as in certmagic. Should we reuse that code somehow? It's unexported.
func pemDecodePrivateKey(keyPEMBytes []byte) (crypto.PrivateKey, error) {
keyBlockDER, _ := pem.Decode(keyPEMBytes)
if keyBlockDER.Type != "PRIVATE KEY" && !strings.HasSuffix(keyBlockDER.Type, " PRIVATE KEY") {
return nil, fmt.Errorf("unknown PEM header %q", keyBlockDER.Type)
}
if key, err := x509.ParsePKCS1PrivateKey(keyBlockDER.Bytes); err == nil {
return key, nil
}
if key, err := x509.ParsePKCS8PrivateKey(keyBlockDER.Bytes); err == nil {
switch key := key.(type) {
case *rsa.PrivateKey, *ecdsa.PrivateKey, ed25519.PrivateKey:
return key, nil
default:
return nil, fmt.Errorf("found unknown private key type in PKCS#8 wrapping: %T", key)
}
}
if key, err := x509.ParseECPrivateKey(keyBlockDER.Bytes); err == nil {
return key, nil
}
return nil, fmt.Errorf("unknown private key type")
}
func pemEncode(blockType string, b []byte) ([]byte, error) {
var buf bytes.Buffer
err := pem.Encode(&buf, &pem.Block{Type: blockType, Bytes: b})
return buf.Bytes(), err
}
func trusted(cert *x509.Certificate) bool {
chains, err := cert.Verify(x509.VerifyOptions{})
return len(chains) > 0 && err == nil
}
// KeyPair represents a public-private key pair, where the
// public key is also called a certificate.
type KeyPair struct {
// The certificate. By default, this should be the path to
// a PEM file unless format is something else.
Certificate string `json:"certificate,omitempty"`
// The private key. By default, this should be the path to
// a PEM file unless format is something else.
PrivateKey string `json:"private_key,omitempty"`
// The format in which the certificate and private
// key are provided. Default: pem_file
Format string `json:"format,omitempty"`
}
// Load loads the certificate and key.
func (kp KeyPair) Load() (*x509.Certificate, interface{}, error) {
switch kp.Format {
case "", "pem_file":
certData, err := ioutil.ReadFile(kp.Certificate)
if err != nil {
return nil, nil, err
}
keyData, err := ioutil.ReadFile(kp.PrivateKey)
if err != nil {
return nil, nil, err
}
cert, err := pemDecodeSingleCert(certData)
if err != nil {
return nil, nil, err
}
key, err := pemDecodePrivateKey(keyData)
if err != nil {
return nil, nil, err
}
return cert, key, nil
default:
return nil, nil, fmt.Errorf("unsupported format: %s", kp.Format)
}
}
|
