/
challenge.c
250 lines (217 loc) · 6.05 KB
/
challenge.c
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
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
/*
* Challenge related functions
*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of opensips, a free SIP server.
*
* opensips is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* opensips is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* History:
* --------
* 2003-01-20 snprintf in build_auth_hf replaced with memcpy to avoid
* possible issues with too small buffer
* 2003-01-26 consume_credentials no longer complains about ACK/CANCEL(jiri)
* 2006-03-01 pseudo variables support for domain name (bogdan)
*/
#include "../../data_lump.h"
#include "../../mem/mem.h"
#include "../../parser/digest/digest.h"
#include "../../pvar.h"
#include "../../str.h"
#include "../../ut.h"
#include "../../mod_fix.h"
#include "auth_mod.h"
#include "common.h"
#include "challenge.h"
#include "nonce.h"
#include "index.h"
#include "api.h"
static str auth_400_err = str_init(MESSAGE_400);
/*
* proxy_challenge function sends this reply
*/
#define MESSAGE_407 "Proxy Authentication Required"
#define PROXY_AUTH_CHALLENGE "Proxy-Authenticate"
/*
* www_challenge function send this reply
*/
#define MESSAGE_401 "Unauthorized"
#define WWW_AUTH_CHALLENGE "WWW-Authenticate"
#define QOP_PARAM ", qop=\"auth\""
#define QOP_PARAM_LEN (sizeof(QOP_PARAM)-1)
#define STALE_PARAM ", stale=true"
#define STALE_PARAM_LEN (sizeof(STALE_PARAM)-1)
#define DIGEST_REALM ": Digest realm=\""
#define DIGEST_REALM_LEN (sizeof(DIGEST_REALM)-1)
#define DIGEST_NONCE "\", nonce=\""
#define DIGEST_NONCE_LEN (sizeof(DIGEST_NONCE)-1)
#define DIGEST_MD5 ", algorithm=MD5"
#define DIGEST_MD5_LEN (sizeof(DIGEST_MD5)-1)
/*
* Create {WWW,Proxy}-Authenticate header field
*/
static inline char *build_auth_hf(int _retries, int _stale, str* _realm,
int* _len, int _qop, char* _hf_name)
{
int hf_name_len;
char *hf, *p;
int index = 0;
if(!disable_nonce_check) {
/* get the nonce index and mark it as used */
index= reserve_nonce_index();
if(index == -1)
{
LM_ERR("no more nonces can be generated\n");
return 0;
}
LM_DBG("nonce index= %d\n", index);
}
/* length calculation */
*_len=hf_name_len=strlen(_hf_name);
*_len+=DIGEST_REALM_LEN
+_realm->len
+DIGEST_NONCE_LEN
+((!disable_nonce_check)?NONCE_LEN:NONCE_LEN-8)
+1 /* '"' */
+((_qop)? QOP_PARAM_LEN:0)
+((_stale)? STALE_PARAM_LEN : 0)
#ifdef _PRINT_MD5
+DIGEST_MD5_LEN
#endif
+CRLF_LEN ;
p=hf=pkg_malloc(*_len+1);
if (!hf) {
LM_ERR("no pkg memory left\n");
*_len=0;
return 0;
}
memcpy(p, _hf_name, hf_name_len); p+=hf_name_len;
memcpy(p, DIGEST_REALM, DIGEST_REALM_LEN);p+=DIGEST_REALM_LEN;
memcpy(p, _realm->s, _realm->len);p+=_realm->len;
memcpy(p, DIGEST_NONCE, DIGEST_NONCE_LEN);p+=DIGEST_NONCE_LEN;
calc_nonce(p, time(0) + nonce_expire, index, &secret);
p+=((!disable_nonce_check)?NONCE_LEN:NONCE_LEN-8);
*p='"';p++;
if (_qop) {
memcpy(p, QOP_PARAM, QOP_PARAM_LEN);
p+=QOP_PARAM_LEN;
}
if (_stale) {
memcpy(p, STALE_PARAM, STALE_PARAM_LEN);
p+=STALE_PARAM_LEN;
}
#ifdef _PRINT_MD5
memcpy(p, DIGEST_MD5, DIGEST_MD5_LEN ); p+=DIGEST_MD5_LEN;
#endif
memcpy(p, CRLF, CRLF_LEN ); p+=CRLF_LEN;
*p=0; /* zero terminator, just in case */
LM_DBG("'%s'\n", hf);
return hf;
}
/*
* Create and send a challenge
*/
static inline int challenge(struct sip_msg* _msg, str *realm, int _qop,
int _code, char* _message, char* _challenge_msg)
{
int auth_hf_len;
struct hdr_field* h = NULL;
auth_body_t* cred = 0;
char *auth_hf;
int ret;
hdr_types_t hftype = 0; /* Makes gcc happy */
struct sip_uri *uri;
str reason;
switch(_code) {
case 401:
get_authorized_cred(_msg->authorization, &h);
hftype = HDR_AUTHORIZATION_T;
break;
case 407:
get_authorized_cred(_msg->proxy_auth, &h);
hftype = HDR_PROXYAUTH_T;
break;
}
if (h) cred = (auth_body_t*)(h->parsed);
if (realm->len == 0) {
if (get_realm(_msg, hftype, &uri) < 0) {
LM_ERR("failed to extract URI\n");
if (send_resp(_msg, 400, &auth_400_err, 0, 0) == -1) {
LM_ERR("failed to send the response\n");
return -1;
}
return 0;
}
realm = &uri->host;
strip_realm(realm);
}
auth_hf = build_auth_hf(0, (cred ? cred->stale : 0), realm,
&auth_hf_len, _qop, _challenge_msg);
if (!auth_hf) {
LM_ERR("failed to generate nonce\n");
return -1;
}
reason.s = _message;
reason.len = strlen(_message);
ret = send_resp(_msg, _code, &reason, auth_hf, auth_hf_len);
if (auth_hf) pkg_free(auth_hf);
if (ret == -1) {
LM_ERR("failed to send the response\n");
return -1;
}
return 0;
}
/*
* Challenge a user to send credentials using WWW-Authorize header field
*/
int www_challenge(struct sip_msg* _msg, str* _realm, int* _qop)
{
return challenge(_msg, _realm, *_qop, 401,
MESSAGE_401, WWW_AUTH_CHALLENGE);
}
/*
* Challenge a user to send credentials using Proxy-Authorize header field
*/
int proxy_challenge(struct sip_msg* _msg, str* _realm, int* _qop)
{
return challenge(_msg, _realm, *_qop, 407,
MESSAGE_407, PROXY_AUTH_CHALLENGE);
}
/*
* Remove used credentials from a SIP message header
*/
int consume_credentials(struct sip_msg* _m, char* _s1, char* _s2)
{
struct hdr_field* h;
int len;
get_authorized_cred(_m->authorization, &h);
if (!h) {
get_authorized_cred(_m->proxy_auth, &h);
if (!h) {
if (_m->REQ_METHOD!=METHOD_ACK
&& _m->REQ_METHOD!=METHOD_CANCEL) {
LM_ERR("no authorized credentials found (error in scripts)\n");
}
return -1;
}
}
len=h->len;
if (del_lump(_m, h->name.s - _m->buf, len, 0) == 0) {
LM_ERR("can't remove credentials\n");
return -1;
}
return 1;
}