Mon Jun 27 16:50:57 2011

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 #include "asterisk.h"
00029 
00030 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 315145 $")
00031 
00032 #ifdef HAVE_FCNTL_H
00033 #include <fcntl.h>
00034 #endif
00035 
00036 #include <signal.h>
00037 #include <sys/signal.h>
00038 
00039 #include "asterisk/compat.h"
00040 #include "asterisk/tcptls.h"
00041 #include "asterisk/http.h"
00042 #include "asterisk/utils.h"
00043 #include "asterisk/strings.h"
00044 #include "asterisk/options.h"
00045 #include "asterisk/manager.h"
00046 #include "asterisk/astobj2.h"
00047 
00048 /*! \brief
00049  * replacement read/write functions for SSL support.
00050  * We use wrappers rather than SSL_read/SSL_write directly so
00051  * we can put in some debugging.
00052  */
00053 
00054 #ifdef DO_SSL
00055 static HOOK_T ssl_read(void *cookie, char *buf, LEN_T len)
00056 {
00057    int i = SSL_read(cookie, buf, len-1);
00058 #if 0
00059    if (i >= 0)
00060       buf[i] = '\0';
00061    ast_verb(0, "ssl read size %d returns %d <%s>\n", (int)len, i, buf);
00062 #endif
00063    return i;
00064 }
00065 
00066 static HOOK_T ssl_write(void *cookie, const char *buf, LEN_T len)
00067 {
00068 #if 0
00069    char *s = alloca(len+1);
00070    strncpy(s, buf, len);
00071    s[len] = '\0';
00072    ast_verb(0, "ssl write size %d <%s>\n", (int)len, s);
00073 #endif
00074    return SSL_write(cookie, buf, len);
00075 }
00076 
00077 static int ssl_close(void *cookie)
00078 {
00079    close(SSL_get_fd(cookie));
00080    SSL_shutdown(cookie);
00081    SSL_free(cookie);
00082    return 0;
00083 }
00084 #endif   /* DO_SSL */
00085 
00086 HOOK_T ast_tcptls_server_read(struct ast_tcptls_session_instance *tcptls_session, void *buf, size_t count)
00087 {
00088    if (tcptls_session->fd == -1) {
00089       ast_log(LOG_ERROR, "server_read called with an fd of -1\n");
00090       errno = EIO;
00091       return -1;
00092    }
00093 
00094 #ifdef DO_SSL
00095    if (tcptls_session->ssl)
00096       return ssl_read(tcptls_session->ssl, buf, count);
00097 #endif
00098    return read(tcptls_session->fd, buf, count);
00099 }
00100 
00101 HOOK_T ast_tcptls_server_write(struct ast_tcptls_session_instance *tcptls_session, const void *buf, size_t count)
00102 {
00103    if (tcptls_session->fd == -1) {
00104       ast_log(LOG_ERROR, "server_write called with an fd of -1\n");
00105       errno = EIO;
00106       return -1;
00107    }
00108 
00109 #ifdef DO_SSL
00110    if (tcptls_session->ssl)
00111       return ssl_write(tcptls_session->ssl, buf, count);
00112 #endif
00113    return write(tcptls_session->fd, buf, count);
00114 }
00115 
00116 static void session_instance_destructor(void *obj)
00117 {
00118    struct ast_tcptls_session_instance *i = obj;
00119    ast_mutex_destroy(&i->lock);
00120 }
00121 
00122 /*! \brief
00123 * creates a FILE * from the fd passed by the accept thread.
00124 * This operation is potentially expensive (certificate verification),
00125 * so we do it in the child thread context.
00126 *
00127 * \note must decrement ref count before returning NULL on error
00128 */
00129 static void *handle_tcptls_connection(void *data)
00130 {
00131    struct ast_tcptls_session_instance *tcptls_session = data;
00132 #ifdef DO_SSL
00133    int (*ssl_setup)(SSL *) = (tcptls_session->client) ? SSL_connect : SSL_accept;
00134    int ret;
00135    char err[256];
00136 #endif
00137 
00138    /*
00139    * open a FILE * as appropriate.
00140    */
00141    if (!tcptls_session->parent->tls_cfg) {
00142       tcptls_session->f = fdopen(tcptls_session->fd, "w+");
00143       setvbuf(tcptls_session->f, NULL, _IONBF, 0);
00144    }
00145 #ifdef DO_SSL
00146    else if ( (tcptls_session->ssl = SSL_new(tcptls_session->parent->tls_cfg->ssl_ctx)) ) {
00147       SSL_set_fd(tcptls_session->ssl, tcptls_session->fd);
00148       if ((ret = ssl_setup(tcptls_session->ssl)) <= 0) {
00149          ast_verb(2, "Problem setting up ssl connection: %s\n", ERR_error_string(ERR_get_error(), err));
00150       } else {
00151 #if defined(HAVE_FUNOPEN)  /* the BSD interface */
00152          tcptls_session->f = funopen(tcptls_session->ssl, ssl_read, ssl_write, NULL, ssl_close);
00153 
00154 #elif defined(HAVE_FOPENCOOKIE)  /* the glibc/linux interface */
00155          static const cookie_io_functions_t cookie_funcs = {
00156             ssl_read, ssl_write, NULL, ssl_close
00157          };
00158          tcptls_session->f = fopencookie(tcptls_session->ssl, "w+", cookie_funcs);
00159 #else
00160          /* could add other methods here */
00161          ast_debug(2, "no tcptls_session->f methods attempted!");
00162 #endif
00163          if ((tcptls_session->client && !ast_test_flag(&tcptls_session->parent->tls_cfg->flags, AST_SSL_DONT_VERIFY_SERVER))
00164             || (!tcptls_session->client && ast_test_flag(&tcptls_session->parent->tls_cfg->flags, AST_SSL_VERIFY_CLIENT))) {
00165             X509 *peer;
00166             long res;
00167             peer = SSL_get_peer_certificate(tcptls_session->ssl);
00168             if (!peer)
00169                ast_log(LOG_WARNING, "No peer SSL certificate\n");
00170             res = SSL_get_verify_result(tcptls_session->ssl);
00171             if (res != X509_V_OK)
00172                ast_log(LOG_ERROR, "Certificate did not verify: %s\n", X509_verify_cert_error_string(res));
00173             if (!ast_test_flag(&tcptls_session->parent->tls_cfg->flags, AST_SSL_IGNORE_COMMON_NAME)) {
00174                ASN1_STRING *str;
00175                unsigned char *str2;
00176                X509_NAME *name = X509_get_subject_name(peer);
00177                int pos = -1;
00178                int found = 0;
00179 
00180                for (;;) {
00181                   /* Walk the certificate to check all available "Common Name" */
00182                   /* XXX Probably should do a gethostbyname on the hostname and compare that as well */
00183                   pos = X509_NAME_get_index_by_NID(name, NID_commonName, pos);
00184                   if (pos < 0)
00185                      break;
00186                   str = X509_NAME_ENTRY_get_data(X509_NAME_get_entry(name, pos));
00187                   ASN1_STRING_to_UTF8(&str2, str);
00188                   if (str2) {
00189                      if (!strcasecmp(tcptls_session->parent->hostname, (char *) str2))
00190                         found = 1;
00191                      ast_debug(3, "SSL Common Name compare s1='%s' s2='%s'\n", tcptls_session->parent->hostname, str2);
00192                      OPENSSL_free(str2);
00193                   }
00194                   if (found)
00195                      break;
00196                }
00197                if (!found) {
00198                   ast_log(LOG_ERROR, "Certificate common name did not match (%s)\n", tcptls_session->parent->hostname);
00199                   if (peer)
00200                      X509_free(peer);
00201                   close(tcptls_session->fd);
00202                   fclose(tcptls_session->f);
00203                   ao2_ref(tcptls_session, -1);
00204                   return NULL;
00205                }
00206             }
00207             if (peer)
00208                X509_free(peer);
00209          }
00210       }
00211       if (!tcptls_session->f) /* no success opening descriptor stacking */
00212          SSL_free(tcptls_session->ssl);
00213    }
00214 #endif /* DO_SSL */
00215 
00216    if (!tcptls_session->f) {
00217       close(tcptls_session->fd);
00218       ast_log(LOG_WARNING, "FILE * open failed!\n");
00219 #ifndef DO_SSL
00220       if (tcptls_session->parent->tls_cfg) {
00221          ast_log(LOG_WARNING, "Attempted a TLS connection without OpenSSL support.  This will not work!\n");
00222       }
00223 #endif
00224       ao2_ref(tcptls_session, -1);
00225       return NULL;
00226    }
00227 
00228    if (tcptls_session && tcptls_session->parent->worker_fn)
00229       return tcptls_session->parent->worker_fn(tcptls_session);
00230    else
00231       return tcptls_session;
00232 }
00233 
00234 void *ast_tcptls_server_root(void *data)
00235 {
00236    struct ast_tcptls_session_args *desc = data;
00237    int fd;
00238    struct ast_sockaddr addr;
00239    struct ast_tcptls_session_instance *tcptls_session;
00240    pthread_t launched;
00241 
00242    for (;;) {
00243       int i, flags;
00244 
00245       if (desc->periodic_fn)
00246          desc->periodic_fn(desc);
00247       i = ast_wait_for_input(desc->accept_fd, desc->poll_timeout);
00248       if (i <= 0)
00249          continue;
00250       fd = ast_accept(desc->accept_fd, &addr);
00251       if (fd < 0) {
00252          if ((errno != EAGAIN) && (errno != EINTR))
00253             ast_log(LOG_WARNING, "Accept failed: %s\n", strerror(errno));
00254          continue;
00255       }
00256       tcptls_session = ao2_alloc(sizeof(*tcptls_session), session_instance_destructor);
00257       if (!tcptls_session) {
00258          ast_log(LOG_WARNING, "No memory for new session: %s\n", strerror(errno));
00259          close(fd);
00260          continue;
00261       }
00262 
00263       ast_mutex_init(&tcptls_session->lock);
00264 
00265       flags = fcntl(fd, F_GETFL);
00266       fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
00267       tcptls_session->fd = fd;
00268       tcptls_session->parent = desc;
00269       ast_sockaddr_copy(&tcptls_session->remote_address, &addr);
00270 
00271       tcptls_session->client = 0;
00272 
00273       /* This thread is now the only place that controls the single ref to tcptls_session */
00274       if (ast_pthread_create_detached_background(&launched, NULL, handle_tcptls_connection, tcptls_session)) {
00275          ast_log(LOG_WARNING, "Unable to launch helper thread: %s\n", strerror(errno));
00276          close(tcptls_session->fd);
00277          ao2_ref(tcptls_session, -1);
00278       }
00279    }
00280    return NULL;
00281 }
00282 
00283 static int __ssl_setup(struct ast_tls_config *cfg, int client)
00284 {
00285 #ifndef DO_SSL
00286    cfg->enabled = 0;
00287    return 0;
00288 #else
00289    if (!cfg->enabled)
00290       return 0;
00291 
00292    SSL_load_error_strings();
00293    SSLeay_add_ssl_algorithms();
00294 
00295    if (client) {
00296 #ifndef OPENSSL_NO_SSL2
00297       if (ast_test_flag(&cfg->flags, AST_SSL_SSLV2_CLIENT)) {
00298          cfg->ssl_ctx = SSL_CTX_new(SSLv2_client_method());
00299       } else
00300 #endif
00301       if (ast_test_flag(&cfg->flags, AST_SSL_SSLV3_CLIENT)) {
00302          cfg->ssl_ctx = SSL_CTX_new(SSLv3_client_method());
00303       } else if (ast_test_flag(&cfg->flags, AST_SSL_TLSV1_CLIENT)) {
00304          cfg->ssl_ctx = SSL_CTX_new(TLSv1_client_method());
00305       } else {
00306          /* SSLv23_client_method() sends SSLv2, this was the original
00307           * default for ssl clients before the option was given to
00308           * pick what protocol a client should use.  In order not
00309           * to break expected behavior it remains the default. */
00310          cfg->ssl_ctx = SSL_CTX_new(SSLv23_client_method());
00311       }
00312    } else {
00313       /* SSLv23_server_method() supports TLSv1, SSLv2, and SSLv3 inbound connections. */
00314       cfg->ssl_ctx = SSL_CTX_new(SSLv23_server_method());
00315    }
00316 
00317    if (!cfg->ssl_ctx) {
00318       ast_debug(1, "Sorry, SSL_CTX_new call returned null...\n");
00319       cfg->enabled = 0;
00320       return 0;
00321    }
00322    if (!ast_strlen_zero(cfg->certfile)) {
00323       char *tmpprivate = ast_strlen_zero(cfg->pvtfile) ? cfg->certfile : cfg->pvtfile;
00324       if (SSL_CTX_use_certificate_file(cfg->ssl_ctx, cfg->certfile, SSL_FILETYPE_PEM) == 0) {
00325          if (!client) {
00326             /* Clients don't need a certificate, but if its setup we can use it */
00327             ast_verb(0, "SSL error loading cert file. <%s>", cfg->certfile);
00328             sleep(2);
00329             cfg->enabled = 0;
00330             return 0;
00331          }
00332       }
00333       if ((SSL_CTX_use_PrivateKey_file(cfg->ssl_ctx, tmpprivate, SSL_FILETYPE_PEM) == 0) || (SSL_CTX_check_private_key(cfg->ssl_ctx) == 0 )) {
00334          if (!client) {
00335             /* Clients don't need a private key, but if its setup we can use it */
00336             ast_verb(0, "SSL error loading private key file. <%s>", tmpprivate);
00337             sleep(2);
00338             cfg->enabled = 0;
00339             return 0;
00340          }
00341       }
00342    }
00343    if (!ast_strlen_zero(cfg->cipher)) {
00344       if (SSL_CTX_set_cipher_list(cfg->ssl_ctx, cfg->cipher) == 0 ) {
00345          if (!client) {
00346             ast_verb(0, "SSL cipher error <%s>", cfg->cipher);
00347             sleep(2);
00348             cfg->enabled = 0;
00349             return 0;
00350          }
00351       }
00352    }
00353    if (!ast_strlen_zero(cfg->cafile) || !ast_strlen_zero(cfg->capath)) {
00354       if (SSL_CTX_load_verify_locations(cfg->ssl_ctx, S_OR(cfg->cafile, NULL), S_OR(cfg->capath,NULL)) == 0)
00355          ast_verb(0, "SSL CA file(%s)/path(%s) error\n", cfg->cafile, cfg->capath);
00356    }
00357 
00358    ast_verb(0, "SSL certificate ok\n");
00359    return 1;
00360 #endif
00361 }
00362 
00363 int ast_ssl_setup(struct ast_tls_config *cfg)
00364 {
00365    return __ssl_setup(cfg, 0);
00366 }
00367 
00368 struct ast_tcptls_session_instance *ast_tcptls_client_start(struct ast_tcptls_session_instance *tcptls_session)
00369 {
00370    struct ast_tcptls_session_args *desc;
00371    int flags;
00372 
00373    if (!(desc = tcptls_session->parent)) {
00374       goto client_start_error;
00375    }
00376 
00377    if (ast_connect(desc->accept_fd, &desc->remote_address)) {
00378       ast_log(LOG_ERROR, "Unable to connect %s to %s: %s\n",
00379          desc->name,
00380          ast_sockaddr_stringify(&desc->remote_address),
00381          strerror(errno));
00382       goto client_start_error;
00383    }
00384 
00385    flags = fcntl(desc->accept_fd, F_GETFL);
00386    fcntl(desc->accept_fd, F_SETFL, flags & ~O_NONBLOCK);
00387 
00388    if (desc->tls_cfg) {
00389       desc->tls_cfg->enabled = 1;
00390       __ssl_setup(desc->tls_cfg, 1);
00391    }
00392 
00393    return handle_tcptls_connection(tcptls_session);
00394 
00395 client_start_error:
00396    close(desc->accept_fd);
00397    desc->accept_fd = -1;
00398    if (tcptls_session) {
00399       ao2_ref(tcptls_session, -1);
00400    }
00401    return NULL;
00402 
00403 }
00404 
00405 struct ast_tcptls_session_instance *ast_tcptls_client_create(struct ast_tcptls_session_args *desc)
00406 {
00407    int x = 1;
00408    struct ast_tcptls_session_instance *tcptls_session = NULL;
00409 
00410    /* Do nothing if nothing has changed */
00411    if (!ast_sockaddr_cmp(&desc->old_address, &desc->remote_address)) {
00412       ast_debug(1, "Nothing changed in %s\n", desc->name);
00413       return NULL;
00414    }
00415 
00416    ast_sockaddr_copy(&desc->old_address, &desc->remote_address);
00417 
00418    if (desc->accept_fd != -1)
00419       close(desc->accept_fd);
00420 
00421    desc->accept_fd = socket(ast_sockaddr_is_ipv6(&desc->remote_address) ?
00422              AF_INET6 : AF_INET, SOCK_STREAM, IPPROTO_TCP);
00423    if (desc->accept_fd < 0) {
00424       ast_log(LOG_WARNING, "Unable to allocate socket for %s: %s\n",
00425          desc->name, strerror(errno));
00426       return NULL;
00427    }
00428 
00429    /* if a local address was specified, bind to it so the connection will
00430       originate from the desired address */
00431    if (!ast_sockaddr_isnull(&desc->local_address)) {
00432       setsockopt(desc->accept_fd, SOL_SOCKET, SO_REUSEADDR, &x, sizeof(x));
00433       if (ast_bind(desc->accept_fd, &desc->local_address)) {
00434          ast_log(LOG_ERROR, "Unable to bind %s to %s: %s\n",
00435             desc->name,
00436             ast_sockaddr_stringify(&desc->local_address),
00437             strerror(errno));
00438          goto error;
00439       }
00440    }
00441 
00442    if (!(tcptls_session = ao2_alloc(sizeof(*tcptls_session), session_instance_destructor)))
00443       goto error;
00444 
00445    ast_mutex_init(&tcptls_session->lock);
00446    tcptls_session->client = 1;
00447    tcptls_session->fd = desc->accept_fd;
00448    tcptls_session->parent = desc;
00449    tcptls_session->parent->worker_fn = NULL;
00450    ast_sockaddr_copy(&tcptls_session->remote_address,
00451            &desc->remote_address);
00452 
00453    return tcptls_session;
00454 
00455 error:
00456    close(desc->accept_fd);
00457    desc->accept_fd = -1;
00458    if (tcptls_session)
00459       ao2_ref(tcptls_session, -1);
00460    return NULL;
00461 }
00462 
00463 void ast_tcptls_server_start(struct ast_tcptls_session_args *desc)
00464 {
00465    int flags;
00466    int x = 1;
00467 
00468    /* Do nothing if nothing has changed */
00469    if (!ast_sockaddr_cmp(&desc->old_address, &desc->local_address)) {
00470       ast_debug(1, "Nothing changed in %s\n", desc->name);
00471       return;
00472    }
00473 
00474    ast_sockaddr_copy(&desc->old_address, &desc->local_address);
00475 
00476    /* Shutdown a running server if there is one */
00477    if (desc->master != AST_PTHREADT_NULL) {
00478       pthread_cancel(desc->master);
00479       pthread_kill(desc->master, SIGURG);
00480       pthread_join(desc->master, NULL);
00481    }
00482 
00483    if (desc->accept_fd != -1)
00484       close(desc->accept_fd);
00485 
00486    /* If there's no new server, stop here */
00487    if (ast_sockaddr_isnull(&desc->local_address)) {
00488       ast_debug(2, "Server disabled:  %s\n", desc->name);
00489       return;
00490    }
00491 
00492    desc->accept_fd = socket(ast_sockaddr_is_ipv6(&desc->local_address) ?
00493              AF_INET6 : AF_INET, SOCK_STREAM, 0);
00494    if (desc->accept_fd < 0) {
00495       ast_log(LOG_ERROR, "Unable to allocate socket for %s: %s\n", desc->name, strerror(errno));
00496       return;
00497    }
00498 
00499    setsockopt(desc->accept_fd, SOL_SOCKET, SO_REUSEADDR, &x, sizeof(x));
00500    if (ast_bind(desc->accept_fd, &desc->local_address)) {
00501       ast_log(LOG_ERROR, "Unable to bind %s to %s: %s\n",
00502          desc->name,
00503          ast_sockaddr_stringify(&desc->local_address),
00504          strerror(errno));
00505       goto error;
00506    }
00507    if (listen(desc->accept_fd, 10)) {
00508       ast_log(LOG_ERROR, "Unable to listen for %s!\n", desc->name);
00509       goto error;
00510    }
00511    flags = fcntl(desc->accept_fd, F_GETFL);
00512    fcntl(desc->accept_fd, F_SETFL, flags | O_NONBLOCK);
00513    if (ast_pthread_create_background(&desc->master, NULL, desc->accept_fn, desc)) {
00514       ast_log(LOG_ERROR, "Unable to launch thread for %s on %s: %s\n",
00515          desc->name,
00516          ast_sockaddr_stringify(&desc->local_address),
00517          strerror(errno));
00518       goto error;
00519    }
00520    return;
00521 
00522 error:
00523    close(desc->accept_fd);
00524    desc->accept_fd = -1;
00525 }
00526 
00527 void ast_tcptls_server_stop(struct ast_tcptls_session_args *desc)
00528 {
00529    if (desc->master != AST_PTHREADT_NULL) {
00530       pthread_cancel(desc->master);
00531       pthread_kill(desc->master, SIGURG);
00532       pthread_join(desc->master, NULL);
00533    }
00534    if (desc->accept_fd != -1)
00535       close(desc->accept_fd);
00536    desc->accept_fd = -1;
00537    ast_debug(2, "Stopped server :: %s\n", desc->name);
00538 }
00539 
00540 int ast_tls_read_conf(struct ast_tls_config *tls_cfg, struct ast_tcptls_session_args *tls_desc, const char *varname, const char *value)
00541 {
00542    if (!strcasecmp(varname, "tlsenable") || !strcasecmp(varname, "sslenable")) {
00543       tls_cfg->enabled = ast_true(value) ? 1 : 0;
00544    } else if (!strcasecmp(varname, "tlscertfile") || !strcasecmp(varname, "sslcert") || !strcasecmp(varname, "tlscert")) {
00545       ast_free(tls_cfg->certfile);
00546       tls_cfg->certfile = ast_strdup(value);
00547    } else if (!strcasecmp(varname, "tlsprivatekey") || !strcasecmp(varname, "sslprivatekey")) {
00548       ast_free(tls_cfg->pvtfile);
00549       tls_cfg->pvtfile = ast_strdup(value);
00550    } else if (!strcasecmp(varname, "tlscipher") || !strcasecmp(varname, "sslcipher")) {
00551       ast_free(tls_cfg->cipher);
00552       tls_cfg->cipher = ast_strdup(value);
00553    } else if (!strcasecmp(varname, "tlscafile")) {
00554       ast_free(tls_cfg->cafile);
00555       tls_cfg->cafile = ast_strdup(value);
00556    } else if (!strcasecmp(varname, "tlscapath") || !strcasecmp(varname, "tlscadir")) {
00557       ast_free(tls_cfg->capath);
00558       tls_cfg->capath = ast_strdup(value);
00559    } else if (!strcasecmp(varname, "tlsverifyclient")) {
00560       ast_set2_flag(&tls_cfg->flags, ast_true(value), AST_SSL_VERIFY_CLIENT);
00561    } else if (!strcasecmp(varname, "tlsdontverifyserver")) {
00562       ast_set2_flag(&tls_cfg->flags, ast_true(value), AST_SSL_DONT_VERIFY_SERVER);
00563    } else if (!strcasecmp(varname, "tlsbindaddr") || !strcasecmp(varname, "sslbindaddr")) {
00564       if (ast_parse_arg(value, PARSE_ADDR, &tls_desc->local_address))
00565          ast_log(LOG_WARNING, "Invalid %s '%s'\n", varname, value);
00566    } else if (!strcasecmp(varname, "tlsclientmethod") || !strcasecmp(varname, "sslclientmethod")) {
00567       if (!strcasecmp(value, "tlsv1")) {
00568          ast_set_flag(&tls_cfg->flags, AST_SSL_TLSV1_CLIENT);
00569          ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV3_CLIENT);
00570          ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV2_CLIENT);
00571       } else if (!strcasecmp(value, "sslv3")) {
00572          ast_set_flag(&tls_cfg->flags, AST_SSL_SSLV3_CLIENT);
00573          ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV2_CLIENT);
00574          ast_clear_flag(&tls_cfg->flags, AST_SSL_TLSV1_CLIENT);
00575       } else if (!strcasecmp(value, "sslv2")) {
00576          ast_set_flag(&tls_cfg->flags, AST_SSL_SSLV2_CLIENT);
00577          ast_clear_flag(&tls_cfg->flags, AST_SSL_TLSV1_CLIENT);
00578          ast_clear_flag(&tls_cfg->flags, AST_SSL_SSLV3_CLIENT);
00579       }
00580    } else {
00581       return -1;
00582    }
00583 
00584    return 0;
00585 }

Generated on Mon Jun 27 16:50:57 2011 for Asterisk - The Open Source Telephony Project by  doxygen 1.4.7