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
|
package acme
import (
"bytes"
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rsa"
"fmt"
"net/http"
"sync"
"gopkg.in/square/go-jose.v1"
)
type jws struct {
directoryURL string
privKey crypto.PrivateKey
nonces nonceManager
}
func keyAsJWK(key interface{}) *jose.JsonWebKey {
switch k := key.(type) {
case *ecdsa.PublicKey:
return &jose.JsonWebKey{Key: k, Algorithm: "EC"}
case *rsa.PublicKey:
return &jose.JsonWebKey{Key: k, Algorithm: "RSA"}
default:
return nil
}
}
// Posts a JWS signed message to the specified URL.
// It does NOT close the response body, so the caller must
// do that if no error was returned.
func (j *jws) post(url string, content []byte) (*http.Response, error) {
signedContent, err := j.signContent(content)
if err != nil {
return nil, fmt.Errorf("Failed to sign content -> %s", err.Error())
}
resp, err := httpPost(url, "application/jose+json", bytes.NewBuffer([]byte(signedContent.FullSerialize())))
if err != nil {
return nil, fmt.Errorf("Failed to HTTP POST to %s -> %s", url, err.Error())
}
nonce, nonceErr := getNonceFromResponse(resp)
if nonceErr == nil {
j.nonces.Push(nonce)
}
return resp, nil
}
func (j *jws) signContent(content []byte) (*jose.JsonWebSignature, error) {
var alg jose.SignatureAlgorithm
switch k := j.privKey.(type) {
case *rsa.PrivateKey:
alg = jose.RS256
case *ecdsa.PrivateKey:
if k.Curve == elliptic.P256() {
alg = jose.ES256
} else if k.Curve == elliptic.P384() {
alg = jose.ES384
}
}
signer, err := jose.NewSigner(alg, j.privKey)
if err != nil {
return nil, fmt.Errorf("Failed to create jose signer -> %s", err.Error())
}
signer.SetNonceSource(j)
signed, err := signer.Sign(content)
if err != nil {
return nil, fmt.Errorf("Failed to sign content -> %s", err.Error())
}
return signed, nil
}
func (j *jws) Nonce() (string, error) {
if nonce, ok := j.nonces.Pop(); ok {
return nonce, nil
}
return getNonce(j.directoryURL)
}
type nonceManager struct {
nonces []string
sync.Mutex
}
func (n *nonceManager) Pop() (string, bool) {
n.Lock()
defer n.Unlock()
if len(n.nonces) == 0 {
return "", false
}
nonce := n.nonces[len(n.nonces)-1]
n.nonces = n.nonces[:len(n.nonces)-1]
return nonce, true
}
func (n *nonceManager) Push(nonce string) {
n.Lock()
defer n.Unlock()
n.nonces = append(n.nonces, nonce)
}
func getNonce(url string) (string, error) {
resp, err := httpHead(url)
if err != nil {
return "", fmt.Errorf("Failed to get nonce from HTTP HEAD -> %s", err.Error())
}
return getNonceFromResponse(resp)
}
func getNonceFromResponse(resp *http.Response) (string, error) {
nonce := resp.Header.Get("Replay-Nonce")
if nonce == "" {
return "", fmt.Errorf("Server did not respond with a proper nonce header.")
}
return nonce, nil
}
|
