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/*
* 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"
ASTERISK_FILE_VERSION(__FILE__, "$Revision: 373079 $")
#ifdef HAVE_OPENSSL
#include <openssl/ssl.h>
#include <openssl/err.h>
#endif
#include <dlfcn.h>
#include "asterisk/_private.h" /* ast_ssl_init() */
#include "asterisk/utils.h"
#include "asterisk/lock.h"
#ifdef HAVE_OPENSSL
#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 & CRYPTO_LOCK) {
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 ERR_load_SSL_strings(void)
{
#if defined(AST_DEVMODE)
if (startup_complete) {
ast_debug(1, "Called after startup... ignoring!\n");
}
#endif
}
void ERR_load_crypto_strings(void)
{
#if defined(AST_DEVMODE)
if (startup_complete) {
ast_debug(1, "Called after startup... ignoring!\n");
}
#endif
}
void ERR_load_BIO_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 */
}
#endif /* HAVE_OPENSSL */
/*!
* \internal
* \brief Common OpenSSL initialization for all of Asterisk.
*/
int ast_ssl_init(void)
{
#ifdef HAVE_OPENSSL
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);
void (*real_ERR_load_SSL_strings)(void);
void (*real_ERR_load_BIO_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();
get_OpenSSL_function(ERR_load_SSL_strings);
real_ERR_load_SSL_strings();
get_OpenSSL_function(ERR_load_BIO_strings);
real_ERR_load_BIO_strings();
startup_complete = 1;
#endif /* HAVE_OPENSSL */
return 0;
}
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