main/tcptls.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 2007 - 2008, Digium, Inc.
   5  *
   6  * Luigi Rizzo (TCP and TLS server code)
   7  * Brett Bryant <brettbryant@gmail.com> (updated for client support)
   8  *
   9  * See http://www.asterisk.org for more information about
  10  * the Asterisk project. Please do not directly contact
  11  * any of the maintainers of this project for assistance;
  12  * the project provides a web site, mailing lists and IRC
  13  * channels for your use.
  14  *
  15  * This program is free software, distributed under the terms of
  16  * the GNU General Public License Version 2. See the LICENSE file
  17  * at the top of the source tree.
  18  */
  19
  20 /*!
  21  * \file
  22  * \brief Code to support TCP and TLS server/client
  23  *
  24  * \author Luigi Rizzo
  25  * \author Brett Bryant <brettbryant@gmail.com>
  26  */
  27
  28 #include "asterisk.h"
  29
  30 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  31
  32 #ifdef HAVE_FCNTL_H
  33 #include <fcntl.h>
  34 #endif
  35
  36 #include <signal.h>
  37 #include <sys/signal.h>
  38
  39 #include "asterisk/compat.h"
  40 #include "asterisk/tcptls.h"
  41 #include "asterisk/http.h"
  42 #include "asterisk/utils.h"
  43 #include "asterisk/strings.h"
  44 #include "asterisk/options.h"
  45 #include "asterisk/manager.h"
  46 #include "asterisk/astobj2.h"
  47
  48 /*! \brief
  49  * replacement read/write functions for SSL support.
  50  * We use wrappers rather than SSL_read/SSL_write directly so
  51  * we can put in some debugging.
  52  */
  53
  54 #ifdef DO_SSL
  55 static HOOK_T ssl_read(void *cookie, char *buf, LEN_T len)
  56 {
  57         int i = SSL_read(cookie, buf, len-1);
  58 #if 0
  59         if (i >= 0) {
  60                 buf[i] = '\0';
  61         }
  62         ast_verb(0, "ssl read size %d returns %d <%s>\n", (int)len, i, buf);
  63 #endif
  64         return i;
  65 }
  66
  67 static HOOK_T ssl_write(void *cookie, const char *buf, LEN_T len)
  68 {
  69 #if 0
  70         char *s = alloca(len+1);
  71
  72         strncpy(s, buf, len);
  73         s[len] = '\0';
  74         ast_verb(0, "ssl write size %d <%s>\n", (int)len, s);
  75 #endif
  76         return SSL_write(cookie, buf, len);
  77 }
  78
  79 static int ssl_close(void *cookie)
  80 {
  81         close(SSL_get_fd(cookie));
  82         SSL_shutdown(cookie);
  83         SSL_free(cookie);
  84         return 0;
  85 }
  86 #endif  /* DO_SSL */
  87
  88 HOOK_T ast_tcptls_server_read(struct ast_tcptls_session_instance *tcptls_session, void *buf, size_t count)
  89 {
  90         if (tcptls_session->fd == -1) {
  91                 ast_log(LOG_ERROR, "server_read called with an fd of -1\n");
  92                 errno = EIO;
  93                 return -1;
  94         }
  95
  96 #ifdef DO_SSL
  97         if (tcptls_session->ssl) {
  98                 return ssl_read(tcptls_session->ssl, buf, count);
  99         }
 100 #endif
 101         return read(tcptls_session->fd, buf, count);
 102 }
 103
 104 HOOK_T ast_tcptls_server_write(struct ast_tcptls_session_instance *tcptls_session, const void *buf, size_t count)
 105 {
 106         if (tcptls_session->fd == -1) {
 107                 ast_log(LOG_ERROR, "server_write called with an fd of -1\n");
 108                 errno = EIO;
 109                 return -1;
 110         }
 111
 112 #ifdef DO_SSL
 113         if (tcptls_session->ssl) {
 114                 return ssl_write(tcptls_session->ssl, buf, count);
 115         }
 116 #endif
 117         return write(tcptls_session->fd, buf, count);
 118 }
 119
 120 static void session_instance_destructor(void *obj)
 121 {
 122         struct ast_tcptls_session_instance *i = obj;
 123         ast_mutex_destroy(&i->lock);
 124 }
 125
 126 /*! \brief
 127 * creates a FILE * from the fd passed by the accept thread.
 128 * This operation is potentially expensive (certificate verification),
 129 * so we do it in the child thread context.
 130 *
 131 * \note must decrement ref count before returning NULL on error
 132 */
 133 static void *handle_tcptls_connection(void *data)
 134 {
 135         struct ast_tcptls_session_instance *tcptls_session = data;
 136 #ifdef DO_SSL
 137         int (*ssl_setup)(SSL *) = (tcptls_session->client) ? SSL_connect : SSL_accept;
 138         int ret;
 139         char err[256];
 140 #endif
 141
 142         /*
 143         * open a FILE * as appropriate.
 144         */
 145         if (!tcptls_session->parent->tls_cfg) {
 146                 if ((tcptls_session->f = fdopen(tcptls_session->fd, "w+"))) {
 147                         if(setvbuf(tcptls_session->f, NULL, _IONBF, 0)) {
 148                                 fclose(tcptls_session->f);
 149                                 tcptls_session->f = NULL;
 150                         }
 151                 }
 152         }
 153 #ifdef DO_SSL
 154         else if ( (tcptls_session->ssl = SSL_new(tcptls_session->parent->tls_cfg->ssl_ctx)) ) {
 155                 SSL_set_fd(tcptls_session->ssl, tcptls_session->fd);
 156                 if ((ret = ssl_setup(tcptls_session->ssl)) <= 0) {
 157                         ast_verb(2, "Problem setting up ssl connection: %s\n", ERR_error_string(ERR_get_error(), err));
 158                 } else {
 159 #if defined(HAVE_FUNOPEN)       /* the BSD interface */
 160                         tcptls_session->f = funopen(tcptls_session->ssl, ssl_read, ssl_write, NULL, ssl_close);
 161
 162 #elif defined(HAVE_FOPENCOOKIE) /* the glibc/linux interface */
 163                         static const cookie_io_functions_t cookie_funcs = {
 164                                 ssl_read, ssl_write, NULL, ssl_close
 165                         };
 166                         tcptls_session->f = fopencookie(tcptls_session->ssl, "w+", cookie_funcs);
 167 #else
 168                         /* could add other methods here */
 169                         ast_debug(2, "no tcptls_session->f methods attempted!");
 170 #endif
 171                         if ((tcptls_session->client && !ast_test_flag(&tcptls_session->parent->tls_cfg->flags, AST_SSL_DONT_VERIFY_SERVER))
 172                                 || (!tcptls_session->client && ast_test_flag(&tcptls_session->parent->tls_cfg->flags, AST_SSL_VERIFY_CLIENT))) {
 173                                 X509 *peer;
 174                                 long res;
 175                                 peer = SSL_get_peer_certificate(tcptls_session->ssl);
 176                                 if (!peer) {
 177                                         ast_log(LOG_WARNING, "No peer SSL certificate\n");
 178                                 }
 179                                 res = SSL_get_verify_result(tcptls_session->ssl);
 180                                 if (res != X509_V_OK) {
 181                                         ast_log(LOG_ERROR, "Certificate did not verify: %s\n", X509_verify_cert_error_string(res));
 182                                 }
 183                                 if (!ast_test_flag(&tcptls_session->parent->tls_cfg->flags, AST_SSL_IGNORE_COMMON_NAME)) {
 184                                         ASN1_STRING *str;
 185                                         unsigned char *str2;
 186                                         X509_NAME *name = X509_get_subject_name(peer);
 187                                         int pos = -1;
 188                                         int found = 0;
 189
 190                                         for (;;) {
 191                                                 /* Walk the certificate to check all available "Common Name" */
 192                                                 /* XXX Probably should do a gethostbyname on the hostname and compare that as well */
 193                                                 pos = X509_NAME_get_index_by_NID(name, NID_commonName, pos);
 194                                                 if (pos < 0) {
 195                                                         break;
 196                                                 }
 197                                                 str = X509_NAME_ENTRY_get_data(X509_NAME_get_entry(name, pos));
 198                                                 ASN1_STRING_to_UTF8(&str2, str);
 199                                                 if (str2) {
 200                                                         if (!strcasecmp(tcptls_session->parent->hostname, (char *) str2)) {
 201                                                                 found = 1;
 202                                                         }
 203                                                         ast_debug(3, "SSL Common Name compare s1='%s' s2='%s'\n", tcptls_session->parent->hostname, str2);
 204                                                         OPENSSL_free(str2);
 205                                                 }
 206                                                 if (found) {
 207                                                         break;
 208                                                 }
 209                                         }
 210                                         if (!found) {
 211                                                 ast_log(LOG_ERROR, "Certificate common name did not match (%s)\n", tcptls_session->parent->hostname);
 212                                                 if (peer) {
 213                                                         X509_free(peer);
 214                                                 }
 215                                                 close(tcptls_session->fd);
 216                                                 fclose(tcptls_session->f);
 217                                                 ao2_ref(tcptls_session, -1);
 218                                                 return NULL;
 219                                         }
 220                                 }
 221                                 if (peer) {
 222                                         X509_free(peer);
 223                                 }
 224                         }
 225                 }
 226                 if (!tcptls_session->f) {       /* no success opening descriptor stacking */
 227                         SSL_free(tcptls_session->ssl);
 228                 }
 229         }
 230 #endif /* DO_SSL */
 231
 232         if (!tcptls_session->f) {
 233                 close(tcptls_session->fd);
 234                 ast_log(LOG_WARNING, "FILE * open failed!\n");
 235 #ifndef DO_SSL
 236                 if (tcptls_session->parent->tls_cfg) {
 237                         ast_log(LOG_WARNING, "Attempted a TLS connection without OpenSSL support. This will not work!\n");
 238                 }
 239 #endif
 240                 ao2_ref(tcptls_session, -1);
 241                 return NULL;
 242         }
 243
 244         if (tcptls_session && tcptls_session->parent->worker_fn) {
 245                 return tcptls_session->parent->worker_fn(tcptls_session);
 246         } else {
 247                 return tcptls_session;
 248         }
 249 }
 250
 251 void *ast_tcptls_server_root(void *data)
 252 {
 253         struct ast_tcptls_session_args *desc = data;
 254         int fd;
 255         struct ast_sockaddr addr;
 256         struct ast_tcptls_session_instance *tcptls_session;
 257         pthread_t launched;
 258
 259         for (;;) {
 260                 int i, flags;
 261
 262                 if (desc->periodic_fn) {
 263                         desc->periodic_fn(desc);
 264                 }
 265                 i = ast_wait_for_input(desc->accept_fd, desc->poll_timeout);
 266                 if (i <= 0) {
 267                         continue;
 268                 }
 269                 fd = ast_accept(desc->accept_fd, &addr);
 270                 if (fd < 0) {
 271                         if ((errno != EAGAIN) && (errno != EINTR)) {
 272                                 ast_log(LOG_WARNING, "Accept failed: %s\n", strerror(errno));
 273                         }
 274                         continue;
 275                 }
 276                 tcptls_session = ao2_alloc(sizeof(*tcptls_session), session_instance_destructor);
 277                 if (!tcptls_session) {
 278                         ast_log(LOG_WARNING, "No memory for new session: %s\n", strerror(errno));
 279                         close(fd);
 280                         continue;
 281                 }
 282
 283                 ast_mutex_init(&tcptls_session->lock);
 284
 285                 flags = fcntl(fd, F_GETFL);
 286                 fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
 287                 tcptls_session->fd = fd;
 288                 tcptls_session->parent = desc;
 289                 ast_sockaddr_copy(&tcptls_session->remote_address, &addr);
 290
 291                 tcptls_session->client = 0;
 292
 293                 /* This thread is now the only place that controls the single ref to tcptls_session */
 294                 if (ast_pthread_create_detached_background(&launched, NULL, handle_tcptls_connection, tcptls_session)) {
 295                         ast_log(LOG_WARNING, "Unable to launch helper thread: %s\n", strerror(errno));
 296                         close(tcptls_session->fd);
 297                         ao2_ref(tcptls_session, -1);
 298                 }
 299         }
 300         return NULL;
 301 }
 302
 303 static int __ssl_setup(struct ast_tls_config *cfg, int client)
 304 {
 305 #ifndef DO_SSL
 306         cfg->enabled = 0;
 307         return 0;
 308 #else
 309         if (!cfg->enabled) {
 310                 return 0;
 311         }
 312
 313         SSL_load_error_strings();
 314         SSLeay_add_ssl_algorithms();
 315
 316         if (client) {
 317 #ifndef OPENSSL_NO_SSL2
 318                 if (ast_test_flag(&cfg->flags, AST_SSL_SSLV2_CLIENT)) {
 319                         cfg->ssl_ctx = SSL_CTX_new(SSLv2_client_method());
 320                 } else
 321 #endif
 322                 if (ast_test_flag(&cfg->flags, AST_SSL_SSLV3_CLIENT)) {
 323                         cfg->ssl_ctx = SSL_CTX_new(SSLv3_client_method());
 324                 } else if (ast_test_flag(&cfg->flags, AST_SSL_TLSV1_CLIENT)) {
 325                         cfg->ssl_ctx = SSL_CTX_new(TLSv1_client_method());
 326                 } else {
 327                         /* SSLv23_client_method() sends SSLv2, this was the original
 328                          * default for ssl clients before the option was given to
 329                          * pick what protocol a client should use.  In order not
 330                          * to break expected behavior it remains the default. */
 331                         cfg->ssl_ctx = SSL_CTX_new(SSLv23_client_method());
 332                 }
 333         } else {
 334                 /* SSLv23_server_method() supports TLSv1, SSLv2, and SSLv3 inbound connections. */
 335                 cfg->ssl_ctx = SSL_CTX_new(SSLv23_server_method());
 336         }
 337
 338         if (!cfg->ssl_ctx) {
 339                 ast_debug(1, "Sorry, SSL_CTX_new call returned null...\n");
 340                 cfg->enabled = 0;
 341                 return 0;
 342         }
 343         if (!ast_strlen_zero(cfg->certfile)) {
 344                 char *tmpprivate = ast_strlen_zero(cfg->pvtfile) ? cfg->certfile : cfg->pvtfile;
 345                 if (SSL_CTX_use_certificate_file(cfg->ssl_ctx, cfg->certfile, SSL_FILETYPE_PEM) == 0) {
 346                         if (!client) {
 347                                 /* Clients don't need a certificate, but if its setup we can use it */
 348                                 ast_verb(0, "SSL error loading cert file. <%s>", cfg->certfile);
 349                                 sleep(2);
 350                                 cfg->enabled = 0;
 351                                 return 0;
 352                         }
 353                 }
 354                 if ((SSL_CTX_use_PrivateKey_file(cfg->ssl_ctx, tmpprivate, SSL_FILETYPE_PEM) == 0) || (SSL_CTX_check_private_key(cfg->ssl_ctx) == 0 )) {
 355                         if (!client) {
 356                                 /* Clients don't need a private key, but if its setup we can use it */
 357                                 ast_verb(0, "SSL error loading private key file. <%s>", tmpprivate);
 358                                 sleep(2);
 359                                 cfg->enabled = 0;
 360                                 return 0;
 361                         }
 362                 }
 363         }
 364         if (!ast_strlen_zero(cfg->cipher)) {
 365                 if (SSL_CTX_set_cipher_list(cfg->ssl_ctx, cfg->cipher) == 0 ) {
 366                         if (!client) {
 367                                 ast_verb(0, "SSL cipher error <%s>", cfg->cipher);
 368                                 sleep(2);
 369                                 cfg->enabled = 0;
 370                                 return 0;
 371                         }
 372                 }
 373         }
 374         if (!ast_strlen_zero(cfg->cafile) || !ast_strlen_zero(cfg->capath)) {
 375                 if (SSL_CTX_load_verify_locations(cfg->ssl_ctx, S_OR(cfg->cafile, NULL), S_OR(cfg->capath,NULL)) == 0) {
 376                         ast_verb(0, "SSL CA file(%s)/path(%s) error\n", cfg->cafile, cfg->capath);
 377                 }
 378         }
 379
 380         ast_verb(0, "SSL certificate ok\n");
 381         return 1;
 382 #endif
 383 }
 384
 385 int ast_ssl_setup(struct ast_tls_config *cfg)
 386 {
 387         return __ssl_setup(cfg, 0);
 388 }
 389
 390 struct ast_tcptls_session_instance *ast_tcptls_client_start(struct ast_tcptls_session_instance *tcptls_session)
 391 {
 392         struct ast_tcptls_session_args *desc;
 393         int flags;
 394
 395         if (!(desc = tcptls_session->parent)) {
 396                 goto client_start_error;
 397         }
 398
 399         if (ast_connect(desc->accept_fd, &desc->remote_address)) {
 400                 ast_log(LOG_ERROR, "Unable to connect %s to %s: %s\n",
 401                         desc->name,
 402                         ast_sockaddr_stringify(&desc->remote_address),
 403                         strerror(errno));
 404                 goto client_start_error;
 405         }
 406
 407         flags = fcntl(desc->accept_fd, F_GETFL);
 408         fcntl(desc->accept_fd, F_SETFL, flags & ~O_NONBLOCK);
 409
 410         if (desc->tls_cfg) {
 411                 desc->tls_cfg->enabled = 1;
 412                 __ssl_setup(desc->tls_cfg, 1);
 413         }
 414
 415         return handle_tcptls_connection(tcptls_session);
 416
 417 client_start_error:
 418         close(desc->accept_fd);
 419         desc->accept_fd = -1;
 420         if (tcptls_session) {
 421                 ao2_ref(tcptls_session, -1);
 422         }
 423         return NULL;
 424
 425 }
 426
 427 struct ast_tcptls_session_instance *ast_tcptls_client_create(struct ast_tcptls_session_args *desc)
 428 {
 429         int x = 1;
 430         struct ast_tcptls_session_instance *tcptls_session = NULL;
 431
 432         /* Do nothing if nothing has changed */
 433         if (!ast_sockaddr_cmp(&desc->old_address, &desc->remote_address)) {
 434                 ast_debug(1, "Nothing changed in %s\n", desc->name);
 435                 return NULL;
 436         }
 437
 438         /* If we return early, there is no connection */
 439         ast_sockaddr_setnull(&desc->old_address);
 440
 441         if (desc->accept_fd != -1) {
 442                 close(desc->accept_fd);
 443         }
 444
 445         desc->accept_fd = socket(ast_sockaddr_is_ipv6(&desc->remote_address) ?
 446                                  AF_INET6 : AF_INET, SOCK_STREAM, IPPROTO_TCP);
 447         if (desc->accept_fd < 0) {
 448                 ast_log(LOG_WARNING, "Unable to allocate socket for %s: %s\n",
 449                         desc->name, strerror(errno));
 450                 return NULL;
 451         }
 452
 453         /* if a local address was specified, bind to it so the connection will
 454            originate from the desired address */
 455         if (!ast_sockaddr_isnull(&desc->local_address)) {
 456                 setsockopt(desc->accept_fd, SOL_SOCKET, SO_REUSEADDR, &x, sizeof(x));
 457                 if (ast_bind(desc->accept_fd, &desc->local_address)) {
 458                         ast_log(LOG_ERROR, "Unable to bind %s to %s: %s\n",
 459                                 desc->name,
 460                                 ast_sockaddr_stringify(&desc->local_address),
 461                                 strerror(errno));
 462                         goto error;
 463                 }
 464         }
 465
 466         if (!(tcptls_session = ao2_alloc(sizeof(*tcptls_session), session_instance_destructor))) {
 467                 goto error;
 468         }
 469
 470         ast_mutex_init(&tcptls_session->lock);
 471         tcptls_session->client = 1;
 472         tcptls_session->fd = desc->accept_fd;
 473         tcptls_session->parent = desc;
 474         tcptls_session->parent->worker_fn = NULL;
 475         ast_sockaddr_copy(&tcptls_session->remote_address,
 476                           &desc->remote_address);
 477
 478         /* Set current info */
 479         ast_sockaddr_copy(&desc->old_address, &desc->remote_address);
 480         return tcptls_session;
 481
 482 error:
 483         close(desc->accept_fd);
 484         desc->accept_fd = -1;
 485         if (tcptls_session) {
 486                 ao2_ref(tcptls_session, -1);
 487         }
 488         return NULL;
 489 }
 490
 491 void ast_tcptls_server_start(struct ast_tcptls_session_args *desc)
 492 {
 493         int flags;
 494         int x = 1;
 495
 496         /* Do nothing if nothing has changed */
 497         if (!ast_sockaddr_cmp(&desc->old_address, &desc->local_address)) {
 498                 ast_debug(1, "Nothing changed in %s\n", desc->name);
 499                 return;
 500         }
 501
 502         /* If we return early, there is no one listening */
 503         ast_sockaddr_setnull(&desc->old_address);
 504
 505         /* Shutdown a running server if there is one */
 506         if (desc->master != AST_PTHREADT_NULL) {
 507                 pthread_cancel(desc->master);
 508                 pthread_kill(desc->master, SIGURG);
 509                 pthread_join(desc->master, NULL);
 510         }
 511
 512         if (desc->accept_fd != -1) {
 513                 close(desc->accept_fd);
 514         }
 515
 516         /* If there's no new server, stop here */
 517         if (ast_sockaddr_isnull(&desc->local_address)) {
 518                 ast_debug(2, "Server disabled:  %s\n", desc->name);
 519                 return;
 520         }
 521
 522         desc->accept_fd = socket(ast_sockaddr_is_ipv6(&desc->local_address) ?
 523                                  AF_INET6 : AF_INET, SOCK_STREAM, 0);
 524         if (desc->accept_fd < 0) {
 525                 ast_log(LOG_ERROR, "Unable to allocate socket for %s: %s\n", desc->name, strerror(errno));
 526                 return;
 527         }
 528
 529         setsockopt(desc->accept_fd, SOL_SOCKET, SO_REUSEADDR, &x, sizeof(x));
 530         if (ast_bind(desc->accept_fd, &desc->local_address)) {
 531                 ast_log(LOG_ERROR, "Unable to bind %s to %s: %s\n",
 532                         desc->name,
 533                         ast_sockaddr_stringify(&desc->local_address),
 534                         strerror(errno));
 535                 goto error;
 536         }
 537         if (listen(desc->accept_fd, 10)) {
 538                 ast_log(LOG_ERROR, "Unable to listen for %s!\n", desc->name);
 539                 goto error;
 540         }
 541         flags = fcntl(desc->accept_fd, F_GETFL);
 542         fcntl(desc->accept_fd, F_SETFL, flags | O_NONBLOCK);
 543         if (ast_pthread_create_background(&desc->master, NULL, desc->accept_fn, desc)) {
 544                 ast_log(LOG_ERROR, "Unable to launch thread for %s on %s: %s\n",
 545                         desc->name,
 546                         ast_sockaddr_stringify(&desc->local_address),
 547                         strerror(errno));
 548                 goto error;
 549         }
 550
 551         /* Set current info */
 552         ast_sockaddr_copy(&desc->old_address, &desc->local_address);
 553
 554         return;
 555
 556 error:
 557         close(desc->accept_fd);
 558         desc->accept_fd = -1;
 559 }
 560
 561 void ast_tcptls_server_stop(struct ast_tcptls_session_args *desc)
 562 {
 563         if (desc->master != AST_PTHREADT_NULL) {
 564                 pthread_cancel(desc->master);
 565                 pthread_kill(desc->master, SIGURG);
 566                 pthread_join(desc->master, NULL);
 567                 desc->master = AST_PTHREADT_NULL;
 568         }
 569         if (desc->accept_fd != -1) {
 570                 close(desc->accept_fd);
 571         }
 572         desc->accept_fd = -1;
 573         ast_debug(2, "Stopped server :: %s\n", desc->name);
 574 }
 575
 576 int ast_tls_read_conf(struct ast_tls_config *tls_cfg, struct ast_tcptls_session_args *tls_desc, const char *varname, const char *value)
 577 {
 578         if (!strcasecmp(varname, "tlsenable") || !strcasecmp(varname, "sslenable")) {
 579                 tls_cfg->enabled = ast_true(value) ? 1 : 0;
 580         } else if (!strcasecmp(varname, "tlscertfile") || !strcasecmp(varname, "sslcert") || !strcasecmp(varname, "tlscert")) {
 581                 ast_free(tls_cfg->certfile);
 582                 tls_cfg->certfile = ast_strdup(value);
 583         } else if (!strcasecmp(varname, "tlsprivatekey") || !strcasecmp(varname, "sslprivatekey")) {
 584                 ast_free(tls_cfg->pvtfile);
 585                 tls_cfg->pvtfile = ast_strdup(value);
 586         } else if (!strcasecmp(varname, "tlscipher") || !strcasecmp(varname, "sslcipher")) {
 587                 ast_free(tls_cfg->cipher);
 588                 tls_cfg->cipher = ast_strdup(value);
 589         } else if (!strcasecmp(varname, "tlscafile")) {
 590                 ast_free(tls_cfg->cafile);
 591                 tls_cfg->cafile = ast_strdup(value);
 592         } else if (!strcasecmp(varname, "tlscapath") || !strcasecmp(varname, "tlscadir")) {
 593                 ast_free(tls_cfg->capath);
 594                 tls_cfg->capath = ast_strdup(value);
 595         } else if (!strcasecmp(varname, "tlsverifyclient")) {
 596                 ast_set2_flag(&tls_cfg->flags, ast_true(value), AST_SSL_VERIFY_CLIENT);
 597         } else if (!strcasecmp(varname, "tlsdontverifyserver")) {
 598                 ast_set2_flag(&tls_cfg->flags, ast_true(value), AST_SSL_DONT_VERIFY_SERVER);
 599         } else if (!strcasecmp(varname, "tlsbindaddr") || !strcasecmp(varname, "sslbindaddr")) {
 600                 if (ast_parse_arg(value, PARSE_ADDR, &tls_desc->local_address))
 601                         ast_log(LOG_WARNING, "Invalid %s '%s'\n", varname, value);
 602         } else if (!strcasecmp(varname, "tlsclientmethod") || !strcasecmp(varname, "sslclientmethod")) {
 603                 if (!strcasecmp(value, "tlsv1")) {
 604                         ast_set_flag(&tls_cfg->flags, AST_SSL_TLSV1_CLIENT);
 605                         ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV3_CLIENT);
 606                         ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV2_CLIENT);
 607                 } else if (!strcasecmp(value, "sslv3")) {
 608                         ast_set_flag(&tls_cfg->flags, AST_SSL_SSLV3_CLIENT);
 609                         ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV2_CLIENT);
 610                         ast_clear_flag(&tls_cfg->flags, AST_SSL_TLSV1_CLIENT);
 611                 } else if (!strcasecmp(value, "sslv2")) {
 612                         ast_set_flag(&tls_cfg->flags, AST_SSL_SSLV2_CLIENT);
 613                         ast_clear_flag(&tls_cfg->flags, AST_SSL_TLSV1_CLIENT);
 614                         ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV3_CLIENT);
 615                 }
 616         } else {
 617                 return -1;
 618         }
 619
 620         return 0;
 621 }