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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
/*
* This file is part of the Nice GLib ICE library.
*
* (C) 2008-2009 Collabora Ltd.
* Contact: Youness Alaoui
* (C) 2007-2009 Nokia Corporation. All rights reserved.
* Contact: Rémi Denis-Courmont
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Nice GLib ICE library.
*
* The Initial Developers of the Original Code are Collabora Ltd and Nokia
* Corporation. All Rights Reserved.
*
* Contributors:
* Youness Alaoui, Collabora Ltd.
* Rémi Denis-Courmont, Nokia
*
* Alternatively, the contents of this file may be used under the terms of the
* the GNU Lesser General Public License Version 2.1 (the "LGPL"), in which
* case the provisions of LGPL are applicable instead of those above. If you
* wish to allow use of your version of this file only under the terms of the
* LGPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replace
* them with the notice and other provisions required by the LGPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the LGPL.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "rand.h"
#include "stunmessage.h"
#include "stunhmac.h"
#include <string.h>
#include <assert.h>
#ifdef HAVE_OPENSSL
#include <openssl/hmac.h>
#include <openssl/sha.h>
#else
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
#endif
void stun_sha1 (const uint8_t *msg, size_t len, size_t msg_len, uint8_t *sha,
const void *key, size_t keylen, int padding)
{
uint16_t fakelen = htons (msg_len);
uint8_t pad_char[64] = {0};
assert (len >= 44u);
#ifdef HAVE_OPENSSL
{
#ifdef NDEBUG
#define TRY(x) x;
#else
int ret;
#define TRY(x) \
ret = x; \
assert (ret == 1);
#endif
#if (OPENSSL_VERSION_NUMBER < 0x10100000L) || \
(defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x2070000fL)
HMAC_CTX stackctx;
HMAC_CTX *ctx = &stackctx;
HMAC_CTX_init (ctx);
#else
HMAC_CTX *ctx = HMAC_CTX_new ();
#endif /* OPENSSL_VERSION_NUMBER */
assert (SHA_DIGEST_LENGTH == 20);
TRY (HMAC_Init_ex (ctx, key, keylen, EVP_sha1(), NULL));
TRY (HMAC_Update (ctx, msg, 2));
TRY (HMAC_Update (ctx, (unsigned char *)&fakelen, 2));
TRY (HMAC_Update (ctx, msg + 4, len - 28));
/* RFC 3489 specifies that the message's size should be 64 bytes,
and \x00 padding should be done */
if (padding && ((len - 24) % 64) > 0) {
uint16_t pad_size = 64 - ((len - 24) % 64);
TRY (HMAC_Update (ctx, pad_char, pad_size));
}
TRY (HMAC_Final (ctx, sha, NULL));
#if (OPENSSL_VERSION_NUMBER < 0x10100000L) || \
(defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x2070000fL)
HMAC_CTX_cleanup (ctx);
#else
HMAC_CTX_free (ctx);
#endif /* OPENSSL_VERSION_NUMBER */
}
#else
{
gnutls_hmac_hd_t handle;
#ifdef NDEBUG
#define TRY(x) x;
#else
int ret;
#define TRY(x) \
ret = x; \
assert (ret >= 0);
#endif
assert (gnutls_hmac_get_len (GNUTLS_MAC_SHA1) == 20);
TRY (gnutls_hmac_init (&handle, GNUTLS_MAC_SHA1, key, keylen));
TRY (gnutls_hmac (handle, msg, 2));
TRY (gnutls_hmac (handle, &fakelen, 2));
TRY (gnutls_hmac (handle, msg + 4, len - 28));
/* RFC 3489 specifies that the message's size should be 64 bytes,
and \x00 padding should be done */
if (padding && ((len - 24) % 64) > 0) {
uint16_t pad_size = 64 - ((len - 24) % 64);
TRY (gnutls_hmac (handle, pad_char, pad_size));
}
gnutls_hmac_deinit (handle, sha);
#undef TRY
}
#endif /* HAVE_OPENSSL */
}
static const uint8_t *priv_trim_var (const uint8_t *var, size_t *var_len)
{
const uint8_t *ptr = var;
while (*ptr == '"') {
ptr++;
(*var_len)--;
}
while(ptr[*var_len-1] == '"' ||
ptr[*var_len-1] == 0) {
(*var_len)--;
}
return ptr;
}
void stun_hash_creds (const uint8_t *realm, size_t realm_len,
const uint8_t *username, size_t username_len,
const uint8_t *password, size_t password_len,
unsigned char md5[16])
{
const uint8_t *username_trimmed = priv_trim_var (username, &username_len);
const uint8_t *password_trimmed = priv_trim_var (password, &password_len);
const uint8_t *realm_trimmed = priv_trim_var (realm, &realm_len);
const uint8_t *colon = (uint8_t *)":";
#ifdef HAVE_OPENSSL
EVP_MD_CTX *ctx;
#if (OPENSSL_VERSION_NUMBER < 0x10100000L) || \
(defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x2070000fL)
ctx = EVP_MD_CTX_create ();
#else
ctx = EVP_MD_CTX_new ();
#endif /* OPENSSL_VERSION_NUMBER */
EVP_DigestInit_ex (ctx, EVP_md5(), NULL);
EVP_DigestUpdate (ctx, username_trimmed, username_len);
EVP_DigestUpdate (ctx, colon, 1);
EVP_DigestUpdate (ctx, realm_trimmed, realm_len);
EVP_DigestUpdate (ctx, colon, 1);
EVP_DigestUpdate (ctx, password_trimmed, password_len);
EVP_DigestFinal_ex (ctx, md5, NULL);
#if (OPENSSL_VERSION_NUMBER < 0x10100000L) || \
(defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x2070000fL)
EVP_MD_CTX_destroy (ctx);
#else
EVP_MD_CTX_free (ctx);
#endif /* OPENSSL_VERSION_NUMBER */
#else
gnutls_hash_hd_t handle;
gnutls_hash_init (&handle, GNUTLS_DIG_MD5);
gnutls_hash (handle, username_trimmed, username_len);
gnutls_hash (handle, colon, 1);
gnutls_hash (handle, realm_trimmed, realm_len);
gnutls_hash (handle, colon, 1);
gnutls_hash (handle, password_trimmed, password_len);
gnutls_hash_deinit (handle, md5);
#endif /* HAVE_OPENSSL */
}
void stun_make_transid (StunTransactionId id)
{
nice_RAND_nonce (id, 16);
}
|
