Tue Aug 20 16:34:39 2013

Asterisk developer's documentation


tcptls.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 2007 - 2008, Digium, Inc.
00005  *
00006  * Luigi Rizzo (TCP and TLS server code)
00007  * Brett Bryant <brettbryant@gmail.com> (updated for client support)
00008  *
00009  * See http://www.asterisk.org for more information about
00010  * the Asterisk project. Please do not directly contact
00011  * any of the maintainers of this project for assistance;
00012  * the project provides a web site, mailing lists and IRC
00013  * channels for your use.
00014  *
00015  * This program is free software, distributed under the terms of
00016  * the GNU General Public License Version 2. See the LICENSE file
00017  * at the top of the source tree.
00018  */
00019 
00020 /*!
00021  * \file
00022  * \brief Code to support TCP and TLS server/client
00023  *
00024  * \author Luigi Rizzo
00025  * \author Brett Bryant <brettbryant@gmail.com>
00026  */
00027 
00028 /*** MODULEINFO
00029    <support_level>core</support_level>
00030  ***/
00031 
00032 #include "asterisk.h"
00033 
00034 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 383165 $")
00035 
00036 #ifdef HAVE_FCNTL_H
00037 #include <fcntl.h>
00038 #endif
00039 
00040 #include <signal.h>
00041 #include <sys/signal.h>
00042 
00043 #include "asterisk/compat.h"
00044 #include "asterisk/tcptls.h"
00045 #include "asterisk/http.h"
00046 #include "asterisk/utils.h"
00047 #include "asterisk/strings.h"
00048 #include "asterisk/options.h"
00049 #include "asterisk/manager.h"
00050 #include "asterisk/astobj2.h"
00051 
00052 /*! \brief
00053  * replacement read/write functions for SSL support.
00054  * We use wrappers rather than SSL_read/SSL_write directly so
00055  * we can put in some debugging.
00056  */
00057 
00058 #ifdef DO_SSL
00059 static HOOK_T ssl_read(void *cookie, char *buf, LEN_T len)
00060 {
00061    int i = SSL_read(cookie, buf, len-1);
00062 #if 0
00063    if (i >= 0)
00064       buf[i] = '\0';
00065    ast_verb(0, "ssl read size %d returns %d <%s>\n", (int)len, i, buf);
00066 #endif
00067    return i;
00068 }
00069 
00070 static HOOK_T ssl_write(void *cookie, const char *buf, LEN_T len)
00071 {
00072 #if 0
00073    char *s = ast_alloca(len+1);
00074    strncpy(s, buf, len);
00075    s[len] = '\0';
00076    ast_verb(0, "ssl write size %d <%s>\n", (int)len, s);
00077 #endif
00078    return SSL_write(cookie, buf, len);
00079 }
00080 
00081 static int ssl_close(void *cookie)
00082 {
00083    int cookie_fd = SSL_get_fd(cookie);
00084    int ret;
00085 
00086    if (cookie_fd > -1) {
00087       /*
00088        * According to the TLS standard, it is acceptable for an application to only send its shutdown
00089        * alert and then close the underlying connection without waiting for the peer's response (this
00090        * way resources can be saved, as the process can already terminate or serve another connection).
00091        */
00092       if ((ret = SSL_shutdown(cookie)) < 0) {
00093          ast_log(LOG_ERROR, "SSL_shutdown() failed: %d\n", SSL_get_error(cookie, ret));
00094       }
00095 
00096       if (!((SSL*)cookie)->server) {
00097          /* For client threads, ensure that the error stack is cleared */
00098          ERR_remove_state(0);
00099       }
00100 
00101       SSL_free(cookie);
00102       /* adding shutdown(2) here has no added benefit */
00103       if (close(cookie_fd)) {
00104          ast_log(LOG_ERROR, "close() failed: %s\n", strerror(errno));
00105       }
00106    }
00107    return 0;
00108 }
00109 #endif   /* DO_SSL */
00110 
00111 HOOK_T ast_tcptls_server_read(struct ast_tcptls_session_instance *tcptls_session, void *buf, size_t count)
00112 {
00113    if (tcptls_session->fd == -1) {
00114       ast_log(LOG_ERROR, "server_read called with an fd of -1\n");
00115       errno = EIO;
00116       return -1;
00117    }
00118 
00119 #ifdef DO_SSL
00120    if (tcptls_session->ssl)
00121       return ssl_read(tcptls_session->ssl, buf, count);
00122 #endif
00123    return read(tcptls_session->fd, buf, count);
00124 }
00125 
00126 HOOK_T ast_tcptls_server_write(struct ast_tcptls_session_instance *tcptls_session, const void *buf, size_t count)
00127 {
00128    if (tcptls_session->fd == -1) {
00129       ast_log(LOG_ERROR, "server_write called with an fd of -1\n");
00130       errno = EIO;
00131       return -1;
00132    }
00133 
00134 #ifdef DO_SSL
00135    if (tcptls_session->ssl)
00136       return ssl_write(tcptls_session->ssl, buf, count);
00137 #endif
00138    return write(tcptls_session->fd, buf, count);
00139 }
00140 
00141 static void session_instance_destructor(void *obj)
00142 {
00143    struct ast_tcptls_session_instance *i = obj;
00144    ast_free(i->overflow_buf);
00145    ast_mutex_destroy(&i->lock);
00146 }
00147 
00148 /*! \brief
00149 * creates a FILE * from the fd passed by the accept thread.
00150 * This operation is potentially expensive (certificate verification),
00151 * so we do it in the child thread context.
00152 *
00153 * \note must decrement ref count before returning NULL on error
00154 */
00155 static void *handle_tcptls_connection(void *data)
00156 {
00157    struct ast_tcptls_session_instance *tcptls_session = data;
00158 #ifdef DO_SSL
00159    int (*ssl_setup)(SSL *) = (tcptls_session->client) ? SSL_connect : SSL_accept;
00160    int ret;
00161    char err[256];
00162 #endif
00163 
00164    /*
00165    * open a FILE * as appropriate.
00166    */
00167    if (!tcptls_session->parent->tls_cfg) {
00168       if ((tcptls_session->f = fdopen(tcptls_session->fd, "w+"))) {
00169          if(setvbuf(tcptls_session->f, NULL, _IONBF, 0)) {
00170             ast_tcptls_close_session_file(tcptls_session);
00171          }
00172       }
00173    }
00174 #ifdef DO_SSL
00175    else if ( (tcptls_session->ssl = SSL_new(tcptls_session->parent->tls_cfg->ssl_ctx)) ) {
00176       SSL_set_fd(tcptls_session->ssl, tcptls_session->fd);
00177       if ((ret = ssl_setup(tcptls_session->ssl)) <= 0) {
00178          ast_verb(2, "Problem setting up ssl connection: %s\n", ERR_error_string(ERR_get_error(), err));
00179       } else {
00180 #if defined(HAVE_FUNOPEN)  /* the BSD interface */
00181          tcptls_session->f = funopen(tcptls_session->ssl, ssl_read, ssl_write, NULL, ssl_close);
00182 
00183 #elif defined(HAVE_FOPENCOOKIE)  /* the glibc/linux interface */
00184          static const cookie_io_functions_t cookie_funcs = {
00185             ssl_read, ssl_write, NULL, ssl_close
00186          };
00187          tcptls_session->f = fopencookie(tcptls_session->ssl, "w+", cookie_funcs);
00188 #else
00189          /* could add other methods here */
00190          ast_debug(2, "no tcptls_session->f methods attempted!\n");
00191 #endif
00192          if ((tcptls_session->client && !ast_test_flag(&tcptls_session->parent->tls_cfg->flags, AST_SSL_DONT_VERIFY_SERVER))
00193             || (!tcptls_session->client && ast_test_flag(&tcptls_session->parent->tls_cfg->flags, AST_SSL_VERIFY_CLIENT))) {
00194             X509 *peer;
00195             long res;
00196             peer = SSL_get_peer_certificate(tcptls_session->ssl);
00197             if (!peer) {
00198                ast_log(LOG_ERROR, "No peer SSL certificate to verify\n");
00199                ast_tcptls_close_session_file(tcptls_session);
00200                ao2_ref(tcptls_session, -1);
00201                return NULL;
00202             }
00203 
00204             res = SSL_get_verify_result(tcptls_session->ssl);
00205             if (res != X509_V_OK) {
00206                ast_log(LOG_ERROR, "Certificate did not verify: %s\n", X509_verify_cert_error_string(res));
00207                X509_free(peer);
00208                ast_tcptls_close_session_file(tcptls_session);
00209                ao2_ref(tcptls_session, -1);
00210                return NULL;
00211             }
00212             if (!ast_test_flag(&tcptls_session->parent->tls_cfg->flags, AST_SSL_IGNORE_COMMON_NAME)) {
00213                ASN1_STRING *str;
00214                unsigned char *str2;
00215                X509_NAME *name = X509_get_subject_name(peer);
00216                int pos = -1;
00217                int found = 0;
00218 
00219                for (;;) {
00220                   /* Walk the certificate to check all available "Common Name" */
00221                   /* XXX Probably should do a gethostbyname on the hostname and compare that as well */
00222                   pos = X509_NAME_get_index_by_NID(name, NID_commonName, pos);
00223                   if (pos < 0)
00224                      break;
00225                   str = X509_NAME_ENTRY_get_data(X509_NAME_get_entry(name, pos));
00226                   ASN1_STRING_to_UTF8(&str2, str);
00227                   if (str2) {
00228                      if (!strcasecmp(tcptls_session->parent->hostname, (char *) str2))
00229                         found = 1;
00230                      ast_debug(3, "SSL Common Name compare s1='%s' s2='%s'\n", tcptls_session->parent->hostname, str2);
00231                      OPENSSL_free(str2);
00232                   }
00233                   if (found)
00234                      break;
00235                }
00236                if (!found) {
00237                   ast_log(LOG_ERROR, "Certificate common name did not match (%s)\n", tcptls_session->parent->hostname);
00238                   X509_free(peer);
00239                   ast_tcptls_close_session_file(tcptls_session);
00240                   ao2_ref(tcptls_session, -1);
00241                   return NULL;
00242                }
00243             }
00244             X509_free(peer);
00245          }
00246       }
00247       if (!tcptls_session->f) /* no success opening descriptor stacking */
00248          SSL_free(tcptls_session->ssl);
00249    }
00250 #endif /* DO_SSL */
00251 
00252    if (!tcptls_session->f) {
00253       ast_tcptls_close_session_file(tcptls_session);
00254       ast_log(LOG_WARNING, "FILE * open failed!\n");
00255 #ifndef DO_SSL
00256       if (tcptls_session->parent->tls_cfg) {
00257          ast_log(LOG_WARNING, "Attempted a TLS connection without OpenSSL support.  This will not work!\n");
00258       }
00259 #endif
00260       ao2_ref(tcptls_session, -1);
00261       return NULL;
00262    }
00263 
00264    if (tcptls_session->parent->worker_fn) {
00265       return tcptls_session->parent->worker_fn(tcptls_session);
00266    } else {
00267       return tcptls_session;
00268    }
00269 }
00270 
00271 void *ast_tcptls_server_root(void *data)
00272 {
00273    struct ast_tcptls_session_args *desc = data;
00274    int fd;
00275    struct ast_sockaddr addr;
00276    struct ast_tcptls_session_instance *tcptls_session;
00277    pthread_t launched;
00278 
00279    for (;;) {
00280       int i, flags;
00281 
00282       if (desc->periodic_fn)
00283          desc->periodic_fn(desc);
00284       i = ast_wait_for_input(desc->accept_fd, desc->poll_timeout);
00285       if (i <= 0)
00286          continue;
00287       fd = ast_accept(desc->accept_fd, &addr);
00288       if (fd < 0) {
00289          if ((errno != EAGAIN) && (errno != EINTR))
00290             ast_log(LOG_WARNING, "Accept failed: %s\n", strerror(errno));
00291          continue;
00292       }
00293       tcptls_session = ao2_alloc(sizeof(*tcptls_session), session_instance_destructor);
00294       if (!tcptls_session) {
00295          ast_log(LOG_WARNING, "No memory for new session: %s\n", strerror(errno));
00296          if (close(fd)) {
00297             ast_log(LOG_ERROR, "close() failed: %s\n", strerror(errno));
00298          }
00299          continue;
00300       }
00301 
00302       ast_mutex_init(&tcptls_session->lock);
00303       tcptls_session->overflow_buf = ast_str_create(128);
00304 
00305       flags = fcntl(fd, F_GETFL);
00306       fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
00307       tcptls_session->fd = fd;
00308       tcptls_session->parent = desc;
00309       ast_sockaddr_copy(&tcptls_session->remote_address, &addr);
00310 
00311       tcptls_session->client = 0;
00312 
00313       /* This thread is now the only place that controls the single ref to tcptls_session */
00314       if (ast_pthread_create_detached_background(&launched, NULL, handle_tcptls_connection, tcptls_session)) {
00315          ast_log(LOG_WARNING, "Unable to launch helper thread: %s\n", strerror(errno));
00316          ast_tcptls_close_session_file(tcptls_session);
00317          ao2_ref(tcptls_session, -1);
00318       }
00319    }
00320    return NULL;
00321 }
00322 
00323 static int __ssl_setup(struct ast_tls_config *cfg, int client)
00324 {
00325 #ifndef DO_SSL
00326    cfg->enabled = 0;
00327    return 0;
00328 #else
00329    if (!cfg->enabled)
00330       return 0;
00331 
00332    /* Get rid of an old SSL_CTX since we're about to
00333     * allocate a new one
00334     */
00335    if (cfg->ssl_ctx) {
00336       SSL_CTX_free(cfg->ssl_ctx);
00337       cfg->ssl_ctx = NULL;
00338    }
00339 
00340    if (client) {
00341 #ifndef OPENSSL_NO_SSL2
00342       if (ast_test_flag(&cfg->flags, AST_SSL_SSLV2_CLIENT)) {
00343          cfg->ssl_ctx = SSL_CTX_new(SSLv2_client_method());
00344       } else
00345 #endif
00346       if (ast_test_flag(&cfg->flags, AST_SSL_SSLV3_CLIENT)) {
00347          cfg->ssl_ctx = SSL_CTX_new(SSLv3_client_method());
00348       } else if (ast_test_flag(&cfg->flags, AST_SSL_TLSV1_CLIENT)) {
00349          cfg->ssl_ctx = SSL_CTX_new(TLSv1_client_method());
00350       } else {
00351          /* SSLv23_client_method() sends SSLv2, this was the original
00352           * default for ssl clients before the option was given to
00353           * pick what protocol a client should use.  In order not
00354           * to break expected behavior it remains the default. */
00355          cfg->ssl_ctx = SSL_CTX_new(SSLv23_client_method());
00356       }
00357    } else {
00358       /* SSLv23_server_method() supports TLSv1, SSLv2, and SSLv3 inbound connections. */
00359       cfg->ssl_ctx = SSL_CTX_new(SSLv23_server_method());
00360    }
00361 
00362    if (!cfg->ssl_ctx) {
00363       ast_debug(1, "Sorry, SSL_CTX_new call returned null...\n");
00364       cfg->enabled = 0;
00365       return 0;
00366    }
00367 
00368    SSL_CTX_set_verify(cfg->ssl_ctx,
00369       ast_test_flag(&cfg->flags, AST_SSL_VERIFY_CLIENT) ? SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT : SSL_VERIFY_NONE,
00370       NULL);
00371 
00372    if (!ast_strlen_zero(cfg->certfile)) {
00373       char *tmpprivate = ast_strlen_zero(cfg->pvtfile) ? cfg->certfile : cfg->pvtfile;
00374       if (SSL_CTX_use_certificate_file(cfg->ssl_ctx, cfg->certfile, SSL_FILETYPE_PEM) == 0) {
00375          if (!client) {
00376             /* Clients don't need a certificate, but if its setup we can use it */
00377             ast_verb(0, "SSL error loading cert file. <%s>", cfg->certfile);
00378             cfg->enabled = 0;
00379             SSL_CTX_free(cfg->ssl_ctx);
00380             cfg->ssl_ctx = NULL;
00381             return 0;
00382          }
00383       }
00384       if ((SSL_CTX_use_PrivateKey_file(cfg->ssl_ctx, tmpprivate, SSL_FILETYPE_PEM) == 0) || (SSL_CTX_check_private_key(cfg->ssl_ctx) == 0 )) {
00385          if (!client) {
00386             /* Clients don't need a private key, but if its setup we can use it */
00387             ast_verb(0, "SSL error loading private key file. <%s>", tmpprivate);
00388             cfg->enabled = 0;
00389             SSL_CTX_free(cfg->ssl_ctx);
00390             cfg->ssl_ctx = NULL;
00391             return 0;
00392          }
00393       }
00394    }
00395    if (!ast_strlen_zero(cfg->cipher)) {
00396       if (SSL_CTX_set_cipher_list(cfg->ssl_ctx, cfg->cipher) == 0 ) {
00397          if (!client) {
00398             ast_verb(0, "SSL cipher error <%s>", cfg->cipher);
00399             cfg->enabled = 0;
00400             SSL_CTX_free(cfg->ssl_ctx);
00401             cfg->ssl_ctx = NULL;
00402             return 0;
00403          }
00404       }
00405    }
00406    if (!ast_strlen_zero(cfg->cafile) || !ast_strlen_zero(cfg->capath)) {
00407       if (SSL_CTX_load_verify_locations(cfg->ssl_ctx, S_OR(cfg->cafile, NULL), S_OR(cfg->capath,NULL)) == 0)
00408          ast_verb(0, "SSL CA file(%s)/path(%s) error\n", cfg->cafile, cfg->capath);
00409    }
00410 
00411    ast_verb(0, "SSL certificate ok\n");
00412    return 1;
00413 #endif
00414 }
00415 
00416 int ast_ssl_setup(struct ast_tls_config *cfg)
00417 {
00418    return __ssl_setup(cfg, 0);
00419 }
00420 
00421 void ast_ssl_teardown(struct ast_tls_config *cfg)
00422 {
00423 #ifdef DO_SSL
00424    if (cfg->ssl_ctx) {
00425       SSL_CTX_free(cfg->ssl_ctx);
00426       cfg->ssl_ctx = NULL;
00427    }
00428 #endif
00429 }
00430 
00431 struct ast_tcptls_session_instance *ast_tcptls_client_start(struct ast_tcptls_session_instance *tcptls_session)
00432 {
00433    struct ast_tcptls_session_args *desc;
00434    int flags;
00435 
00436    if (!(desc = tcptls_session->parent)) {
00437       goto client_start_error;
00438    }
00439 
00440    if (ast_connect(desc->accept_fd, &desc->remote_address)) {
00441       ast_log(LOG_ERROR, "Unable to connect %s to %s: %s\n",
00442          desc->name,
00443          ast_sockaddr_stringify(&desc->remote_address),
00444          strerror(errno));
00445       goto client_start_error;
00446    }
00447 
00448    flags = fcntl(desc->accept_fd, F_GETFL);
00449    fcntl(desc->accept_fd, F_SETFL, flags & ~O_NONBLOCK);
00450 
00451    if (desc->tls_cfg) {
00452       desc->tls_cfg->enabled = 1;
00453       __ssl_setup(desc->tls_cfg, 1);
00454    }
00455 
00456    return handle_tcptls_connection(tcptls_session);
00457 
00458 client_start_error:
00459    if (desc) {
00460       close(desc->accept_fd);
00461       desc->accept_fd = -1;
00462    }
00463    ao2_ref(tcptls_session, -1);
00464    return NULL;
00465 
00466 }
00467 
00468 struct ast_tcptls_session_instance *ast_tcptls_client_create(struct ast_tcptls_session_args *desc)
00469 {
00470    int x = 1;
00471    struct ast_tcptls_session_instance *tcptls_session = NULL;
00472 
00473    /* Do nothing if nothing has changed */
00474    if (!ast_sockaddr_cmp(&desc->old_address, &desc->remote_address)) {
00475       ast_debug(1, "Nothing changed in %s\n", desc->name);
00476       return NULL;
00477    }
00478 
00479    /* If we return early, there is no connection */
00480    ast_sockaddr_setnull(&desc->old_address);
00481 
00482    if (desc->accept_fd != -1)
00483       close(desc->accept_fd);
00484 
00485    desc->accept_fd = socket(ast_sockaddr_is_ipv6(&desc->remote_address) ?
00486              AF_INET6 : AF_INET, SOCK_STREAM, IPPROTO_TCP);
00487    if (desc->accept_fd < 0) {
00488       ast_log(LOG_WARNING, "Unable to allocate socket for %s: %s\n",
00489          desc->name, strerror(errno));
00490       return NULL;
00491    }
00492 
00493    /* if a local address was specified, bind to it so the connection will
00494       originate from the desired address */
00495    if (!ast_sockaddr_isnull(&desc->local_address)) {
00496       setsockopt(desc->accept_fd, SOL_SOCKET, SO_REUSEADDR, &x, sizeof(x));
00497       if (ast_bind(desc->accept_fd, &desc->local_address)) {
00498          ast_log(LOG_ERROR, "Unable to bind %s to %s: %s\n",
00499             desc->name,
00500             ast_sockaddr_stringify(&desc->local_address),
00501             strerror(errno));
00502          goto error;
00503       }
00504    }
00505 
00506    if (!(tcptls_session = ao2_alloc(sizeof(*tcptls_session), session_instance_destructor)))
00507       goto error;
00508 
00509    ast_mutex_init(&tcptls_session->lock);
00510    tcptls_session->overflow_buf = ast_str_create(128);
00511    tcptls_session->client = 1;
00512    tcptls_session->fd = desc->accept_fd;
00513    tcptls_session->parent = desc;
00514    tcptls_session->parent->worker_fn = NULL;
00515    ast_sockaddr_copy(&tcptls_session->remote_address,
00516            &desc->remote_address);
00517 
00518    /* Set current info */
00519    ast_sockaddr_copy(&desc->old_address, &desc->remote_address);
00520    return tcptls_session;
00521 
00522 error:
00523    close(desc->accept_fd);
00524    desc->accept_fd = -1;
00525    if (tcptls_session)
00526       ao2_ref(tcptls_session, -1);
00527    return NULL;
00528 }
00529 
00530 void ast_tcptls_server_start(struct ast_tcptls_session_args *desc)
00531 {
00532    int flags;
00533    int x = 1;
00534 
00535    /* Do nothing if nothing has changed */
00536    if (!ast_sockaddr_cmp(&desc->old_address, &desc->local_address)) {
00537       ast_debug(1, "Nothing changed in %s\n", desc->name);
00538       return;
00539    }
00540 
00541    /* If we return early, there is no one listening */
00542    ast_sockaddr_setnull(&desc->old_address);
00543 
00544    /* Shutdown a running server if there is one */
00545    if (desc->master != AST_PTHREADT_NULL) {
00546       pthread_cancel(desc->master);
00547       pthread_kill(desc->master, SIGURG);
00548       pthread_join(desc->master, NULL);
00549    }
00550 
00551    if (desc->accept_fd != -1)
00552       close(desc->accept_fd);
00553 
00554    /* If there's no new server, stop here */
00555    if (ast_sockaddr_isnull(&desc->local_address)) {
00556       ast_debug(2, "Server disabled:  %s\n", desc->name);
00557       return;
00558    }
00559 
00560    desc->accept_fd = socket(ast_sockaddr_is_ipv6(&desc->local_address) ?
00561              AF_INET6 : AF_INET, SOCK_STREAM, 0);
00562    if (desc->accept_fd < 0) {
00563       ast_log(LOG_ERROR, "Unable to allocate socket for %s: %s\n", desc->name, strerror(errno));
00564       return;
00565    }
00566 
00567    setsockopt(desc->accept_fd, SOL_SOCKET, SO_REUSEADDR, &x, sizeof(x));
00568    if (ast_bind(desc->accept_fd, &desc->local_address)) {
00569       ast_log(LOG_ERROR, "Unable to bind %s to %s: %s\n",
00570          desc->name,
00571          ast_sockaddr_stringify(&desc->local_address),
00572          strerror(errno));
00573       goto error;
00574    }
00575    if (listen(desc->accept_fd, 10)) {
00576       ast_log(LOG_ERROR, "Unable to listen for %s!\n", desc->name);
00577       goto error;
00578    }
00579    flags = fcntl(desc->accept_fd, F_GETFL);
00580    fcntl(desc->accept_fd, F_SETFL, flags | O_NONBLOCK);
00581    if (ast_pthread_create_background(&desc->master, NULL, desc->accept_fn, desc)) {
00582       ast_log(LOG_ERROR, "Unable to launch thread for %s on %s: %s\n",
00583          desc->name,
00584          ast_sockaddr_stringify(&desc->local_address),
00585          strerror(errno));
00586       goto error;
00587    }
00588 
00589    /* Set current info */
00590    ast_sockaddr_copy(&desc->old_address, &desc->local_address);
00591 
00592    return;
00593 
00594 error:
00595    close(desc->accept_fd);
00596    desc->accept_fd = -1;
00597 }
00598 
00599 void ast_tcptls_close_session_file(struct ast_tcptls_session_instance *tcptls_session)
00600 {
00601    if (tcptls_session->f) {
00602       if (fclose(tcptls_session->f)) {
00603          ast_log(LOG_ERROR, "fclose() failed: %s\n", strerror(errno));
00604       }
00605       tcptls_session->f = NULL;
00606       tcptls_session->fd = -1;
00607    } else if (tcptls_session->fd != -1) {
00608       if (close(tcptls_session->fd)) {
00609          ast_log(LOG_ERROR, "close() failed: %s\n", strerror(errno));
00610       }
00611       tcptls_session->fd = -1;
00612    } else {
00613       ast_log(LOG_ERROR, "ast_tcptls_close_session_file invoked on session instance without file or file descriptor\n");
00614    }
00615 }
00616 
00617 void ast_tcptls_server_stop(struct ast_tcptls_session_args *desc)
00618 {
00619    if (desc->master != AST_PTHREADT_NULL) {
00620       pthread_cancel(desc->master);
00621       pthread_kill(desc->master, SIGURG);
00622       pthread_join(desc->master, NULL);
00623       desc->master = AST_PTHREADT_NULL;
00624    }
00625    if (desc->accept_fd != -1)
00626       close(desc->accept_fd);
00627    desc->accept_fd = -1;
00628    ast_debug(2, "Stopped server :: %s\n", desc->name);
00629 }
00630 
00631 int ast_tls_read_conf(struct ast_tls_config *tls_cfg, struct ast_tcptls_session_args *tls_desc, const char *varname, const char *value)
00632 {
00633    if (!strcasecmp(varname, "tlsenable") || !strcasecmp(varname, "sslenable")) {
00634       tls_cfg->enabled = ast_true(value) ? 1 : 0;
00635    } else if (!strcasecmp(varname, "tlscertfile") || !strcasecmp(varname, "sslcert") || !strcasecmp(varname, "tlscert")) {
00636       ast_free(tls_cfg->certfile);
00637       tls_cfg->certfile = ast_strdup(value);
00638    } else if (!strcasecmp(varname, "tlsprivatekey") || !strcasecmp(varname, "sslprivatekey")) {
00639       ast_free(tls_cfg->pvtfile);
00640       tls_cfg->pvtfile = ast_strdup(value);
00641    } else if (!strcasecmp(varname, "tlscipher") || !strcasecmp(varname, "sslcipher")) {
00642       ast_free(tls_cfg->cipher);
00643       tls_cfg->cipher = ast_strdup(value);
00644    } else if (!strcasecmp(varname, "tlscafile")) {
00645       ast_free(tls_cfg->cafile);
00646       tls_cfg->cafile = ast_strdup(value);
00647    } else if (!strcasecmp(varname, "tlscapath") || !strcasecmp(varname, "tlscadir")) {
00648       ast_free(tls_cfg->capath);
00649       tls_cfg->capath = ast_strdup(value);
00650    } else if (!strcasecmp(varname, "tlsverifyclient")) {
00651       ast_set2_flag(&tls_cfg->flags, ast_true(value), AST_SSL_VERIFY_CLIENT);
00652    } else if (!strcasecmp(varname, "tlsdontverifyserver")) {
00653       ast_set2_flag(&tls_cfg->flags, ast_true(value), AST_SSL_DONT_VERIFY_SERVER);
00654    } else if (!strcasecmp(varname, "tlsbindaddr") || !strcasecmp(varname, "sslbindaddr")) {
00655       if (ast_parse_arg(value, PARSE_ADDR, &tls_desc->local_address))
00656          ast_log(LOG_WARNING, "Invalid %s '%s'\n", varname, value);
00657    } else if (!strcasecmp(varname, "tlsclientmethod") || !strcasecmp(varname, "sslclientmethod")) {
00658       if (!strcasecmp(value, "tlsv1")) {
00659          ast_set_flag(&tls_cfg->flags, AST_SSL_TLSV1_CLIENT);
00660          ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV3_CLIENT);
00661          ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV2_CLIENT);
00662       } else if (!strcasecmp(value, "sslv3")) {
00663          ast_set_flag(&tls_cfg->flags, AST_SSL_SSLV3_CLIENT);
00664          ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV2_CLIENT);
00665          ast_clear_flag(&tls_cfg->flags, AST_SSL_TLSV1_CLIENT);
00666       } else if (!strcasecmp(value, "sslv2")) {
00667          ast_set_flag(&tls_cfg->flags, AST_SSL_SSLV2_CLIENT);
00668          ast_clear_flag(&tls_cfg->flags, AST_SSL_TLSV1_CLIENT);
00669          ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV3_CLIENT);
00670       }
00671    } else {
00672       return -1;
00673    }
00674 
00675    return 0;
00676 }

Generated on 20 Aug 2013 for Asterisk - The Open Source Telephony Project by  doxygen 1.6.1