00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021
00022
00023
00024
00025
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
00049
00050
00051
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
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
00123
00124
00125
00126
00127
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
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)
00152 tcptls_session->f = funopen(tcptls_session->ssl, ssl_read, ssl_write, NULL, ssl_close);
00153
00154 #elif defined(HAVE_FOPENCOOKIE)
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
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
00182
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)
00212 SSL_free(tcptls_session->ssl);
00213 }
00214 #endif
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
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
00307
00308
00309
00310 cfg->ssl_ctx = SSL_CTX_new(SSLv23_client_method());
00311 }
00312 } else {
00313
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
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
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
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
00430
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
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
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
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 }