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         int cookie_fd = SSL_get_fd(cookie);
  82         int ret;
  83         if (cookie_fd > -1) {
  84                 /*
  85                  * According to the TLS standard, it is acceptable for an application to only send its shutdown
  86                  * alert and then close the underlying connection without waiting for the peer's response (this
  87                  * way resources can be saved, as the process can already terminate or serve another connection).
  88                  */
  89                 if ((ret = SSL_shutdown(cookie)) < 0) {
  90                         ast_log(LOG_ERROR, "SSL_shutdown() failed: %d\n", SSL_get_error(cookie, ret));
  91                 }
  92                 SSL_free(cookie);
  93                 /* adding shutdown(2) here has no added benefit */
  94                 if (close(cookie_fd)) {
  95                         ast_log(LOG_ERROR, "close() failed: %s\n", strerror(errno));
  96                 }
  97         }
  98         return 0;
  99 }
 100 #endif  /* DO_SSL */
 101
 102 HOOK_T ast_tcptls_server_read(struct ast_tcptls_session_instance *tcptls_session, void *buf, size_t count)
 103 {
 104         if (tcptls_session->fd == -1) {
 105                 ast_log(LOG_ERROR, "server_read called with an fd of -1\n");
 106                 errno = EIO;
 107                 return -1;
 108         }
 109
 110 #ifdef DO_SSL
 111         if (tcptls_session->ssl) {
 112                 return ssl_read(tcptls_session->ssl, buf, count);
 113         }
 114 #endif
 115         return read(tcptls_session->fd, buf, count);
 116 }
 117
 118 HOOK_T ast_tcptls_server_write(struct ast_tcptls_session_instance *tcptls_session, const void *buf, size_t count)
 119 {
 120         if (tcptls_session->fd == -1) {
 121                 ast_log(LOG_ERROR, "server_write called with an fd of -1\n");
 122                 errno = EIO;
 123                 return -1;
 124         }
 125
 126 #ifdef DO_SSL
 127         if (tcptls_session->ssl) {
 128                 return ssl_write(tcptls_session->ssl, buf, count);
 129         }
 130 #endif
 131         return write(tcptls_session->fd, buf, count);
 132 }
 133
 134 /*! \brief
 135 * creates a FILE * from the fd passed by the accept thread.
 136 * This operation is potentially expensive (certificate verification),
 137 * so we do it in the child thread context.
 138 *
 139 * \note must decrement ref count before returning NULL on error
 140 */
 141 static void *handle_tcptls_connection(void *data)
 142 {
 143         struct ast_tcptls_session_instance *tcptls_session = data;
 144 #ifdef DO_SSL
 145         int (*ssl_setup)(SSL *) = (tcptls_session->client) ? SSL_connect : SSL_accept;
 146         int ret;
 147         char err[256];
 148 #endif
 149
 150         /*
 151         * open a FILE * as appropriate.
 152         */
 153         if (!tcptls_session->parent->tls_cfg) {
 154                 if ((tcptls_session->f = fdopen(tcptls_session->fd, "w+"))) {
 155                         if(setvbuf(tcptls_session->f, NULL, _IONBF, 0)) {
 156                                 ast_tcptls_close_session_file(tcptls_session);
 157                         }
 158                 }
 159         }
 160 #ifdef DO_SSL
 161         else if ( (tcptls_session->ssl = SSL_new(tcptls_session->parent->tls_cfg->ssl_ctx)) ) {
 162                 SSL_set_fd(tcptls_session->ssl, tcptls_session->fd);
 163                 if ((ret = ssl_setup(tcptls_session->ssl)) <= 0) {
 164                         ast_verb(2, "Problem setting up ssl connection: %s\n", ERR_error_string(ERR_get_error(), err));
 165                 } else {
 166 #if defined(HAVE_FUNOPEN)       /* the BSD interface */
 167                         tcptls_session->f = funopen(tcptls_session->ssl, ssl_read, ssl_write, NULL, ssl_close);
 168
 169 #elif defined(HAVE_FOPENCOOKIE) /* the glibc/linux interface */
 170                         static const cookie_io_functions_t cookie_funcs = {
 171                                 ssl_read, ssl_write, NULL, ssl_close
 172                         };
 173                         tcptls_session->f = fopencookie(tcptls_session->ssl, "w+", cookie_funcs);
 174 #else
 175                         /* could add other methods here */
 176                         ast_debug(2, "no tcptls_session->f methods attempted!");
 177 #endif
 178                         if ((tcptls_session->client && !ast_test_flag(&tcptls_session->parent->tls_cfg->flags, AST_SSL_DONT_VERIFY_SERVER))
 179                                 || (!tcptls_session->client && ast_test_flag(&tcptls_session->parent->tls_cfg->flags, AST_SSL_VERIFY_CLIENT))) {
 180                                 X509 *peer;
 181                                 long res;
 182                                 peer = SSL_get_peer_certificate(tcptls_session->ssl);
 183                                 if (!peer) {
 184                                         ast_log(LOG_WARNING, "No peer SSL certificate\n");
 185                                 }
 186                                 res = SSL_get_verify_result(tcptls_session->ssl);
 187                                 if (res != X509_V_OK) {
 188                                         ast_log(LOG_ERROR, "Certificate did not verify: %s\n", X509_verify_cert_error_string(res));
 189                                 }
 190                                 if (!ast_test_flag(&tcptls_session->parent->tls_cfg->flags, AST_SSL_IGNORE_COMMON_NAME)) {
 191                                         ASN1_STRING *str;
 192                                         unsigned char *str2;
 193                                         X509_NAME *name = X509_get_subject_name(peer);
 194                                         int pos = -1;
 195                                         int found = 0;
 196
 197                                         for (;;) {
 198                                                 /* Walk the certificate to check all available "Common Name" */
 199                                                 /* XXX Probably should do a gethostbyname on the hostname and compare that as well */
 200                                                 pos = X509_NAME_get_index_by_NID(name, NID_commonName, pos);
 201                                                 if (pos < 0) {
 202                                                         break;
 203                                                 }
 204                                                 str = X509_NAME_ENTRY_get_data(X509_NAME_get_entry(name, pos));
 205                                                 ASN1_STRING_to_UTF8(&str2, str);
 206                                                 if (str2) {
 207                                                         if (!strcasecmp(tcptls_session->parent->hostname, (char *) str2)) {
 208                                                                 found = 1;
 209                                                         }
 210                                                         ast_debug(3, "SSL Common Name compare s1='%s' s2='%s'\n", tcptls_session->parent->hostname, str2);
 211                                                         OPENSSL_free(str2);
 212                                                 }
 213                                                 if (found) {
 214                                                         break;
 215                                                 }
 216                                         }
 217                                         if (!found) {
 218                                                 ast_log(LOG_ERROR, "Certificate common name did not match (%s)\n", tcptls_session->parent->hostname);
 219                                                 if (peer) {
 220                                                         X509_free(peer);
 221                                                 }
 222                                                 ast_tcptls_close_session_file(tcptls_session);
 223                                                 ao2_ref(tcptls_session, -1);
 224                                                 return NULL;
 225                                         }
 226                                 }
 227                                 if (peer) {
 228                                         X509_free(peer);
 229                                 }
 230                         }
 231                 }
 232                 if (!tcptls_session->f) {       /* no success opening descriptor stacking */
 233                         SSL_free(tcptls_session->ssl);
 234                 }
 235         }
 236 #endif /* DO_SSL */
 237
 238         if (!tcptls_session->f) {
 239                 ast_tcptls_close_session_file(tcptls_session);
 240                 ast_log(LOG_WARNING, "FILE * open failed!\n");
 241 #ifndef DO_SSL
 242                 if (tcptls_session->parent->tls_cfg) {
 243                         ast_log(LOG_WARNING, "Attempted a TLS connection without OpenSSL support. This will not work!\n");
 244                 }
 245 #endif
 246                 ao2_ref(tcptls_session, -1);
 247                 return NULL;
 248         }
 249
 250         if (tcptls_session && tcptls_session->parent->worker_fn) {
 251                 return tcptls_session->parent->worker_fn(tcptls_session);
 252         } else {
 253                 return tcptls_session;
 254         }
 255 }
 256
 257 void *ast_tcptls_server_root(void *data)
 258 {
 259         struct ast_tcptls_session_args *desc = data;
 260         int fd;
 261         struct ast_sockaddr addr;
 262         struct ast_tcptls_session_instance *tcptls_session;
 263         pthread_t launched;
 264
 265         for (;;) {
 266                 int i, flags;
 267
 268                 if (desc->periodic_fn) {
 269                         desc->periodic_fn(desc);
 270                 }
 271                 i = ast_wait_for_input(desc->accept_fd, desc->poll_timeout);
 272                 if (i <= 0) {
 273                         continue;
 274                 }
 275                 fd = ast_accept(desc->accept_fd, &addr);
 276                 if (fd < 0) {
 277                         if ((errno != EAGAIN) && (errno != EINTR)) {
 278                                 ast_log(LOG_WARNING, "Accept failed: %s\n", strerror(errno));
 279                         }
 280                         continue;
 281                 }
 282                 tcptls_session = ao2_alloc(sizeof(*tcptls_session), NULL);
 283                 if (!tcptls_session) {
 284                         ast_log(LOG_WARNING, "No memory for new session: %s\n", strerror(errno));
 285                         if (close(fd)) {
 286                                 ast_log(LOG_ERROR, "close() failed: %s\n", strerror(errno));
 287                         }
 288                         continue;
 289                 }
 290
 291                 flags = fcntl(fd, F_GETFL);
 292                 fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
 293                 tcptls_session->fd = fd;
 294                 tcptls_session->parent = desc;
 295                 ast_sockaddr_copy(&tcptls_session->remote_address, &addr);
 296
 297                 tcptls_session->client = 0;
 298
 299                 /* This thread is now the only place that controls the single ref to tcptls_session */
 300                 if (ast_pthread_create_detached_background(&launched, NULL, handle_tcptls_connection, tcptls_session)) {
 301                         ast_log(LOG_WARNING, "Unable to launch helper thread: %s\n", strerror(errno));
 302                         ast_tcptls_close_session_file(tcptls_session);
 303                         ao2_ref(tcptls_session, -1);
 304                 }
 305         }
 306         return NULL;
 307 }
 308
 309 static int __ssl_setup(struct ast_tls_config *cfg, int client)
 310 {
 311 #ifndef DO_SSL
 312         cfg->enabled = 0;
 313         return 0;
 314 #else
 315         if (!cfg->enabled) {
 316                 return 0;
 317         }
 318
 319         SSL_load_error_strings();
 320         SSLeay_add_ssl_algorithms();
 321
 322         if (client) {
 323 #ifndef OPENSSL_NO_SSL2
 324                 if (ast_test_flag(&cfg->flags, AST_SSL_SSLV2_CLIENT)) {
 325                         cfg->ssl_ctx = SSL_CTX_new(SSLv2_client_method());
 326                 } else
 327 #endif
 328                 if (ast_test_flag(&cfg->flags, AST_SSL_SSLV3_CLIENT)) {
 329                         cfg->ssl_ctx = SSL_CTX_new(SSLv3_client_method());
 330                 } else if (ast_test_flag(&cfg->flags, AST_SSL_TLSV1_CLIENT)) {
 331                         cfg->ssl_ctx = SSL_CTX_new(TLSv1_client_method());
 332                 } else {
 333                         /* SSLv23_client_method() sends SSLv2, this was the original
 334                          * default for ssl clients before the option was given to
 335                          * pick what protocol a client should use.  In order not
 336                          * to break expected behavior it remains the default. */
 337                         cfg->ssl_ctx = SSL_CTX_new(SSLv23_client_method());
 338                 }
 339         } else {
 340                 /* SSLv23_server_method() supports TLSv1, SSLv2, and SSLv3 inbound connections. */
 341                 cfg->ssl_ctx = SSL_CTX_new(SSLv23_server_method());
 342         }
 343
 344         if (!cfg->ssl_ctx) {
 345                 ast_debug(1, "Sorry, SSL_CTX_new call returned null...\n");
 346                 cfg->enabled = 0;
 347                 return 0;
 348         }
 349         if (!ast_strlen_zero(cfg->certfile)) {
 350                 char *tmpprivate = ast_strlen_zero(cfg->pvtfile) ? cfg->certfile : cfg->pvtfile;
 351                 if (SSL_CTX_use_certificate_file(cfg->ssl_ctx, cfg->certfile, SSL_FILETYPE_PEM) == 0) {
 352                         if (!client) {
 353                                 /* Clients don't need a certificate, but if its setup we can use it */
 354                                 ast_verb(0, "SSL error loading cert file. <%s>\n", cfg->certfile);
 355                                 sleep(2);
 356                                 cfg->enabled = 0;
 357                                 return 0;
 358                         }
 359                 }
 360                 if ((SSL_CTX_use_PrivateKey_file(cfg->ssl_ctx, tmpprivate, SSL_FILETYPE_PEM) == 0) || (SSL_CTX_check_private_key(cfg->ssl_ctx) == 0 )) {
 361                         if (!client) {
 362                                 /* Clients don't need a private key, but if its setup we can use it */
 363                                 ast_verb(0, "SSL error loading private key file. <%s>\n", tmpprivate);
 364                                 sleep(2);
 365                                 cfg->enabled = 0;
 366                                 return 0;
 367                         }
 368                 }
 369         }
 370         if (!ast_strlen_zero(cfg->cipher)) {
 371                 if (SSL_CTX_set_cipher_list(cfg->ssl_ctx, cfg->cipher) == 0 ) {
 372                         if (!client) {
 373                                 ast_verb(0, "SSL cipher error <%s>\n", cfg->cipher);
 374                                 sleep(2);
 375                                 cfg->enabled = 0;
 376                                 return 0;
 377                         }
 378                 }
 379         }
 380         if (!ast_strlen_zero(cfg->cafile) || !ast_strlen_zero(cfg->capath)) {
 381                 if (SSL_CTX_load_verify_locations(cfg->ssl_ctx, S_OR(cfg->cafile, NULL), S_OR(cfg->capath,NULL)) == 0) {
 382                         ast_verb(0, "SSL CA file(%s)/path(%s) error\n", cfg->cafile, cfg->capath);
 383                 }
 384         }
 385
 386         ast_verb(0, "SSL certificate ok\n");
 387         return 1;
 388 #endif
 389 }
 390
 391 int ast_ssl_setup(struct ast_tls_config *cfg)
 392 {
 393         return __ssl_setup(cfg, 0);
 394 }
 395
 396 struct ast_tcptls_session_instance *ast_tcptls_client_start(struct ast_tcptls_session_instance *tcptls_session)
 397 {
 398         struct ast_tcptls_session_args *desc;
 399         int flags;
 400
 401         if (!(desc = tcptls_session->parent)) {
 402                 goto client_start_error;
 403         }
 404
 405         if (ast_connect(desc->accept_fd, &desc->remote_address)) {
 406                 ast_log(LOG_ERROR, "Unable to connect %s to %s: %s\n",
 407                         desc->name,
 408                         ast_sockaddr_stringify(&desc->remote_address),
 409                         strerror(errno));
 410                 goto client_start_error;
 411         }
 412
 413         flags = fcntl(desc->accept_fd, F_GETFL);
 414         fcntl(desc->accept_fd, F_SETFL, flags & ~O_NONBLOCK);
 415
 416         if (desc->tls_cfg) {
 417                 desc->tls_cfg->enabled = 1;
 418                 __ssl_setup(desc->tls_cfg, 1);
 419         }
 420
 421         return handle_tcptls_connection(tcptls_session);
 422
 423 client_start_error:
 424         close(desc->accept_fd);
 425         desc->accept_fd = -1;
 426         if (tcptls_session) {
 427                 ao2_ref(tcptls_session, -1);
 428         }
 429         return NULL;
 430
 431 }
 432
 433 struct ast_tcptls_session_instance *ast_tcptls_client_create(struct ast_tcptls_session_args *desc)
 434 {
 435         int x = 1;
 436         struct ast_tcptls_session_instance *tcptls_session = NULL;
 437
 438         /* Do nothing if nothing has changed */
 439         if (!ast_sockaddr_cmp(&desc->old_address, &desc->remote_address)) {
 440                 ast_debug(1, "Nothing changed in %s\n", desc->name);
 441                 return NULL;
 442         }
 443
 444         /* If we return early, there is no connection */
 445         ast_sockaddr_setnull(&desc->old_address);
 446
 447         if (desc->accept_fd != -1) {
 448                 close(desc->accept_fd);
 449         }
 450
 451         desc->accept_fd = socket(ast_sockaddr_is_ipv6(&desc->remote_address) ?
 452                                  AF_INET6 : AF_INET, SOCK_STREAM, IPPROTO_TCP);
 453         if (desc->accept_fd < 0) {
 454                 ast_log(LOG_WARNING, "Unable to allocate socket for %s: %s\n",
 455                         desc->name, strerror(errno));
 456                 return NULL;
 457         }
 458
 459         /* if a local address was specified, bind to it so the connection will
 460            originate from the desired address */
 461         if (!ast_sockaddr_isnull(&desc->local_address)) {
 462                 setsockopt(desc->accept_fd, SOL_SOCKET, SO_REUSEADDR, &x, sizeof(x));
 463                 if (ast_bind(desc->accept_fd, &desc->local_address)) {
 464                         ast_log(LOG_ERROR, "Unable to bind %s to %s: %s\n",
 465                                 desc->name,
 466                                 ast_sockaddr_stringify(&desc->local_address),
 467                                 strerror(errno));
 468                         goto error;
 469                 }
 470         }
 471
 472         if (!(tcptls_session = ao2_alloc(sizeof(*tcptls_session), NULL))) {
 473                 goto error;
 474         }
 475
 476         tcptls_session->client = 1;
 477         tcptls_session->fd = desc->accept_fd;
 478         tcptls_session->parent = desc;
 479         tcptls_session->parent->worker_fn = NULL;
 480         ast_sockaddr_copy(&tcptls_session->remote_address,
 481                           &desc->remote_address);
 482
 483         /* Set current info */
 484         ast_sockaddr_copy(&desc->old_address, &desc->remote_address);
 485         return tcptls_session;
 486
 487 error:
 488         close(desc->accept_fd);
 489         desc->accept_fd = -1;
 490         if (tcptls_session) {
 491                 ao2_ref(tcptls_session, -1);
 492         }
 493         return NULL;
 494 }
 495
 496 void ast_tcptls_server_start(struct ast_tcptls_session_args *desc)
 497 {
 498         int flags;
 499         int x = 1;
 500
 501         /* Do nothing if nothing has changed */
 502         if (!ast_sockaddr_cmp(&desc->old_address, &desc->local_address)) {
 503                 ast_debug(1, "Nothing changed in %s\n", desc->name);
 504                 return;
 505         }
 506
 507         /* If we return early, there is no one listening */
 508         ast_sockaddr_setnull(&desc->old_address);
 509
 510         /* Shutdown a running server if there is one */
 511         if (desc->master != AST_PTHREADT_NULL) {
 512                 pthread_cancel(desc->master);
 513                 pthread_kill(desc->master, SIGURG);
 514                 pthread_join(desc->master, NULL);
 515         }
 516
 517         if (desc->accept_fd != -1) {
 518                 close(desc->accept_fd);
 519         }
 520
 521         /* If there's no new server, stop here */
 522         if (ast_sockaddr_isnull(&desc->local_address)) {
 523                 ast_debug(2, "Server disabled:  %s\n", desc->name);
 524                 return;
 525         }
 526
 527         desc->accept_fd = socket(ast_sockaddr_is_ipv6(&desc->local_address) ?
 528                                  AF_INET6 : AF_INET, SOCK_STREAM, 0);
 529         if (desc->accept_fd < 0) {
 530                 ast_log(LOG_ERROR, "Unable to allocate socket for %s: %s\n", desc->name, strerror(errno));
 531                 return;
 532         }
 533
 534         setsockopt(desc->accept_fd, SOL_SOCKET, SO_REUSEADDR, &x, sizeof(x));
 535         if (ast_bind(desc->accept_fd, &desc->local_address)) {
 536                 ast_log(LOG_ERROR, "Unable to bind %s to %s: %s\n",
 537                         desc->name,
 538                         ast_sockaddr_stringify(&desc->local_address),
 539                         strerror(errno));
 540                 goto error;
 541         }
 542         if (listen(desc->accept_fd, 10)) {
 543                 ast_log(LOG_ERROR, "Unable to listen for %s!\n", desc->name);
 544                 goto error;
 545         }
 546         flags = fcntl(desc->accept_fd, F_GETFL);
 547         fcntl(desc->accept_fd, F_SETFL, flags | O_NONBLOCK);
 548         if (ast_pthread_create_background(&desc->master, NULL, desc->accept_fn, desc)) {
 549                 ast_log(LOG_ERROR, "Unable to launch thread for %s on %s: %s\n",
 550                         desc->name,
 551                         ast_sockaddr_stringify(&desc->local_address),
 552                         strerror(errno));
 553                 goto error;
 554         }
 555
 556         /* Set current info */
 557         ast_sockaddr_copy(&desc->old_address, &desc->local_address);
 558
 559         return;
 560
 561 error:
 562         close(desc->accept_fd);
 563         desc->accept_fd = -1;
 564 }
 565
 566 void ast_tcptls_close_session_file(struct ast_tcptls_session_instance *tcptls_session)
 567 {
 568         if (tcptls_session->f) {
 569                 if (fclose(tcptls_session->f)) {
 570                         ast_log(LOG_ERROR, "fclose() failed: %s\n", strerror(errno));
 571                 }
 572                 tcptls_session->f = NULL;
 573                 tcptls_session->fd = -1;
 574         } else if (tcptls_session->fd != -1) {
 575                 if (close(tcptls_session->fd)) {
 576                         ast_log(LOG_ERROR, "close() failed: %s\n", strerror(errno));
 577                 }
 578                 tcptls_session->fd = -1;
 579         } else {
 580                 ast_log(LOG_ERROR, "ast_tcptls_close_session_file invoked on session instance without file or file descriptor\n");
 581         }
 582 }
 583
 584 void ast_tcptls_server_stop(struct ast_tcptls_session_args *desc)
 585 {
 586         if (desc->master != AST_PTHREADT_NULL) {
 587                 pthread_cancel(desc->master);
 588                 pthread_kill(desc->master, SIGURG);
 589                 pthread_join(desc->master, NULL);
 590                 desc->master = AST_PTHREADT_NULL;
 591         }
 592         if (desc->accept_fd != -1) {
 593                 close(desc->accept_fd);
 594         }
 595         desc->accept_fd = -1;
 596         ast_debug(2, "Stopped server :: %s\n", desc->name);
 597 }
 598
 599 int ast_tls_read_conf(struct ast_tls_config *tls_cfg, struct ast_tcptls_session_args *tls_desc, const char *varname, const char *value)
 600 {
 601         if (!strcasecmp(varname, "tlsenable") || !strcasecmp(varname, "sslenable")) {
 602                 tls_cfg->enabled = ast_true(value) ? 1 : 0;
 603         } else if (!strcasecmp(varname, "tlscertfile") || !strcasecmp(varname, "sslcert") || !strcasecmp(varname, "tlscert")) {
 604                 ast_free(tls_cfg->certfile);
 605                 tls_cfg->certfile = ast_strdup(value);
 606         } else if (!strcasecmp(varname, "tlsprivatekey") || !strcasecmp(varname, "sslprivatekey")) {
 607                 ast_free(tls_cfg->pvtfile);
 608                 tls_cfg->pvtfile = ast_strdup(value);
 609         } else if (!strcasecmp(varname, "tlscipher") || !strcasecmp(varname, "sslcipher")) {
 610                 ast_free(tls_cfg->cipher);
 611                 tls_cfg->cipher = ast_strdup(value);
 612         } else if (!strcasecmp(varname, "tlscafile")) {
 613                 ast_free(tls_cfg->cafile);
 614                 tls_cfg->cafile = ast_strdup(value);
 615         } else if (!strcasecmp(varname, "tlscapath") || !strcasecmp(varname, "tlscadir")) {
 616                 ast_free(tls_cfg->capath);
 617                 tls_cfg->capath = ast_strdup(value);
 618         } else if (!strcasecmp(varname, "tlsverifyclient")) {
 619                 ast_set2_flag(&tls_cfg->flags, ast_true(value), AST_SSL_VERIFY_CLIENT);
 620         } else if (!strcasecmp(varname, "tlsdontverifyserver")) {
 621                 ast_set2_flag(&tls_cfg->flags, ast_true(value), AST_SSL_DONT_VERIFY_SERVER);
 622         } else if (!strcasecmp(varname, "tlsbindaddr") || !strcasecmp(varname, "sslbindaddr")) {
 623                 if (ast_parse_arg(value, PARSE_ADDR, &tls_desc->local_address))
 624                         ast_log(LOG_WARNING, "Invalid %s '%s'\n", varname, value);
 625         } else if (!strcasecmp(varname, "tlsclientmethod") || !strcasecmp(varname, "sslclientmethod")) {
 626                 if (!strcasecmp(value, "tlsv1")) {
 627                         ast_set_flag(&tls_cfg->flags, AST_SSL_TLSV1_CLIENT);
 628                         ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV3_CLIENT);
 629                         ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV2_CLIENT);
 630                 } else if (!strcasecmp(value, "sslv3")) {
 631                         ast_set_flag(&tls_cfg->flags, AST_SSL_SSLV3_CLIENT);
 632                         ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV2_CLIENT);
 633                         ast_clear_flag(&tls_cfg->flags, AST_SSL_TLSV1_CLIENT);
 634                 } else if (!strcasecmp(value, "sslv2")) {
 635                         ast_set_flag(&tls_cfg->flags, AST_SSL_SSLV2_CLIENT);
 636                         ast_clear_flag(&tls_cfg->flags, AST_SSL_TLSV1_CLIENT);
 637                         ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV3_CLIENT);
 638                 }
 639         } else {
 640                 return -1;
 641         }
 642
 643         return 0;
 644 }