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
|
/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2009-2012, Digium, Inc.
*
* Russell Bryant <russell@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*!
* \file
* \brief Common OpenSSL support code
*
* \author Russell Bryant <russell@digium.com>
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
#include "asterisk/_private.h" /* ast_ssl_init() */
#ifdef HAVE_OPENSSL
#include <openssl/ssl.h>
#include <openssl/err.h>
#endif
#if defined(HAVE_OPENSSL) && \
(!defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER))
#include <dlfcn.h>
#include "asterisk/utils.h"
#include "asterisk/lock.h"
#define get_OpenSSL_function(func) do { real_##func = dlsym(RTLD_NEXT, __stringify(func)); } while(0)
static int startup_complete;
static ast_mutex_t *ssl_locks;
static int ssl_num_locks;
static unsigned long ssl_threadid(void)
{
return (unsigned long) pthread_self();
}
static void ssl_lock(int mode, int n, const char *file, int line)
{
if (n < 0 || n >= ssl_num_locks) {
ast_log(LOG_ERROR, "OpenSSL is full of LIES!!! - "
"ssl_num_locks '%d' - n '%d'\n",
ssl_num_locks, n);
return;
}
if (mode & 0x1) {
ast_mutex_lock(&ssl_locks[n]);
} else {
ast_mutex_unlock(&ssl_locks[n]);
}
}
int SSL_library_init(void)
{
#if defined(AST_DEVMODE)
if (startup_complete) {
ast_debug(1, "Called after startup... ignoring!\n");
}
#endif
return 1;
}
void SSL_load_error_strings(void)
{
#if defined(AST_DEVMODE)
if (startup_complete) {
ast_debug(1, "Called after startup... ignoring!\n");
}
#endif
}
void CRYPTO_set_id_callback(unsigned long (*func)(void))
{
#if defined(AST_DEVMODE)
if (startup_complete) {
ast_debug(1, "Called after startup... ignoring!\n");
}
#endif
}
void CRYPTO_set_locking_callback(void (*func)(int mode,int type, const char *file, int line))
{
#if defined(AST_DEVMODE)
if (startup_complete) {
ast_debug(1, "Called after startup... ignoring!\n");
}
#endif
}
void ERR_free_strings(void)
{
/* we can't allow this to be called, ever */
}
/*!
* \internal
* \brief Common OpenSSL initialization for all of Asterisk.
*
* Not needed for OpenSSL versions >= 1.1.0
*/
int ast_ssl_init(void)
{
unsigned int i;
int (*real_SSL_library_init)(void);
void (*real_CRYPTO_set_id_callback)(unsigned long (*)(void));
void (*real_CRYPTO_set_locking_callback)(void (*)(int, int, const char *, int));
void (*real_SSL_load_error_strings)(void);
const char *errstr;
/* clear any previous dynamic linker errors */
dlerror();
get_OpenSSL_function(SSL_library_init);
if ((errstr = dlerror()) != NULL) {
ast_debug(1, "unable to get real address of SSL_library_init: %s\n", errstr);
/* there is no way to continue in this situation... SSL will
* likely be broken in this process
*/
return -1;
} else {
real_SSL_library_init();
}
/* Make OpenSSL usage thread-safe. */
dlerror();
get_OpenSSL_function(CRYPTO_set_id_callback);
if ((errstr = dlerror()) != NULL) {
ast_debug(1, "unable to get real address of CRYPTO_set_id_callback: %s\n", errstr);
/* there is no way to continue in this situation... SSL will
* likely be broken in this process
*/
return -1;
} else {
real_CRYPTO_set_id_callback(ssl_threadid);
}
dlerror();
get_OpenSSL_function(CRYPTO_set_locking_callback);
if ((errstr = dlerror()) != NULL) {
ast_debug(1, "unable to get real address of CRYPTO_set_locking_callback: %s\n", errstr);
/* there is no way to continue in this situation... SSL will
* likely be broken in this process
*/
return -1;
} else {
ssl_num_locks = CRYPTO_num_locks();
if (!(ssl_locks = ast_calloc(ssl_num_locks, sizeof(ssl_locks[0])))) {
return -1;
}
for (i = 0; i < ssl_num_locks; i++) {
ast_mutex_init(&ssl_locks[i]);
}
real_CRYPTO_set_locking_callback(ssl_lock);
}
/* after this point, we don't check for errors from the dlsym() calls,
* under the assumption that if the ones above were successful, all
* the rest will be too. this assumption holds as long as OpenSSL still
* provides all of these functions.
*/
get_OpenSSL_function(SSL_load_error_strings);
real_SSL_load_error_strings();
startup_complete = 1;
return 0;
}
#else
int ast_ssl_init(void)
{
return 0;
}
#endif
|
