3 Copyright (C) 1998-2005 Ivo Timmermans,
4 2000-2006 Guus Sliepen <guus@tinc-vpn.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include <openssl/pem.h>
28 #include <openssl/rsa.h>
29 #include <openssl/rand.h>
30 #include <openssl/err.h>
31 #include <openssl/evp.h>
33 #include "splay_tree.h"
35 #include "connection.h"
51 static struct event device_ev;
53 bool read_rsa_public_key(connection_t *c) {
60 if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
61 asprintf(&fname, "%s/hosts/%s", confbase, c->name);
63 fp = fopen(fname, "r");
66 logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
67 fname, strerror(errno));
72 result = read_pem_rsa_public_key(fp, &c->rsa_key);
76 logger(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"), fname, strerror(errno));
81 bool read_rsa_private_key() {
88 if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
89 asprintf(&fname, "%s/rsa_key.priv", confbase);
91 fp = fopen(fname, "r");
94 logger(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
95 fname, strerror(errno));
100 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
103 if(fstat(fileno(fp), &s)) {
104 logger(LOG_ERR, _("Could not stat RSA private key file `%s': %s'"), fname, strerror(errno));
109 if(s.st_mode & ~0100700)
110 logger(LOG_WARNING, _("Warning: insecure file permissions for RSA private key file `%s'!"), fname);
113 result = read_pem_rsa_private_key(fp, &myself->connection->rsa_key);
117 logger(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"), fname, strerror(errno));
122 static struct event keyexpire_event;
124 static void keyexpire_handler(int fd, short events, void *data) {
128 void regenerate_key() {
129 RAND_pseudo_bytes((unsigned char *)myself->key, myself->keylength);
131 if(timeout_initialized(&keyexpire_event)) {
132 ifdebug(STATUS) logger(LOG_INFO, _("Regenerating symmetric key"));
133 event_del(&keyexpire_event);
134 send_key_changed(broadcast, myself);
136 timeout_set(&keyexpire_event, keyexpire_handler, NULL);
139 event_add(&keyexpire_event, &(struct timeval){keylifetime, 0});
142 EVP_CIPHER_CTX_init(&packet_ctx);
143 if(!EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, (unsigned char *)myself->key, (unsigned char *)myself->key + myself->cipher->key_len)) {
144 logger(LOG_ERR, _("Error during initialisation of cipher for %s (%s): %s"),
145 myself->name, myself->hostname, ERR_error_string(ERR_get_error(), NULL));
153 Configure node_t myself and set up the local sockets (listen only)
155 bool setup_myself(void) {
158 char *name, *hostname, *mode, *afname, *cipher, *digest;
159 char *address = NULL;
161 struct addrinfo *ai, *aip, hint = {0};
168 myself->connection = new_connection();
169 init_configuration(&myself->connection->config_tree);
171 asprintf(&myself->hostname, _("MYSELF"));
172 asprintf(&myself->connection->hostname, _("MYSELF"));
174 myself->connection->options = 0;
175 myself->connection->protocol_version = PROT_CURRENT;
177 if(!get_config_string(lookup_config(config_tree, "Name"), &name)) { /* Not acceptable */
178 logger(LOG_ERR, _("Name for tinc daemon required!"));
182 if(!check_id(name)) {
183 logger(LOG_ERR, _("Invalid name for myself!"));
189 myself->connection->name = xstrdup(name);
191 if(!read_connection_config(myself->connection)) {
192 logger(LOG_ERR, _("Cannot open host configuration file for myself!"));
196 if(!read_rsa_private_key())
199 if(!get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myport))
200 asprintf(&myport, "655");
202 /* Read in all the subnets specified in the host configuration file */
204 cfg = lookup_config(myself->connection->config_tree, "Subnet");
207 if(!get_config_subnet(cfg, &subnet))
210 subnet_add(myself, subnet);
212 cfg = lookup_config_next(myself->connection->config_tree, cfg);
215 /* Check some options */
217 if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
218 myself->options |= OPTION_INDIRECT;
220 if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
221 myself->options |= OPTION_TCPONLY;
223 if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice) && choice)
224 myself->options |= OPTION_INDIRECT;
226 if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice) && choice)
227 myself->options |= OPTION_TCPONLY;
229 if(get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) && choice)
230 myself->options |= OPTION_PMTU_DISCOVERY;
232 if(myself->options & OPTION_TCPONLY)
233 myself->options |= OPTION_INDIRECT;
235 get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
237 if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
238 if(!strcasecmp(mode, "router"))
239 routing_mode = RMODE_ROUTER;
240 else if(!strcasecmp(mode, "switch"))
241 routing_mode = RMODE_SWITCH;
242 else if(!strcasecmp(mode, "hub"))
243 routing_mode = RMODE_HUB;
245 logger(LOG_ERR, _("Invalid routing mode!"));
250 routing_mode = RMODE_ROUTER;
252 get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
254 #if !defined(SOL_IP) || !defined(IP_TOS)
255 if(priorityinheritance)
256 logger(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
259 if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
262 if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
263 if(maxtimeout <= 0) {
264 logger(LOG_ERR, _("Bogus maximum timeout!"));
270 if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
271 if(!strcasecmp(afname, "IPv4"))
272 addressfamily = AF_INET;
273 else if(!strcasecmp(afname, "IPv6"))
274 addressfamily = AF_INET6;
275 else if(!strcasecmp(afname, "any"))
276 addressfamily = AF_UNSPEC;
278 logger(LOG_ERR, _("Invalid address family!"));
284 get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
286 /* Generate packet encryption key */
289 (lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) {
290 if(!strcasecmp(cipher, "none")) {
291 myself->cipher = NULL;
293 myself->cipher = EVP_get_cipherbyname(cipher);
295 if(!myself->cipher) {
296 logger(LOG_ERR, _("Unrecognized cipher type!"));
301 myself->cipher = EVP_bf_cbc();
304 myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
306 myself->keylength = 1;
308 myself->connection->outcipher = EVP_bf_ofb();
310 myself->key = xmalloc(myself->keylength);
312 if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
316 /* Check if we want to use message authentication codes... */
319 (lookup_config(myself->connection->config_tree, "Digest"), &digest)) {
320 if(!strcasecmp(digest, "none")) {
321 myself->digest = NULL;
323 myself->digest = EVP_get_digestbyname(digest);
325 if(!myself->digest) {
326 logger(LOG_ERR, _("Unrecognized digest type!"));
331 myself->digest = EVP_sha1();
333 myself->connection->outdigest = EVP_sha1();
335 if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"),
336 &myself->maclength)) {
338 if(myself->maclength > myself->digest->md_size) {
339 logger(LOG_ERR, _("MAC length exceeds size of digest!"));
341 } else if(myself->maclength < 0) {
342 logger(LOG_ERR, _("Bogus MAC length!"));
347 myself->maclength = 4;
349 myself->connection->outmaclength = 0;
353 if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"),
354 &myself->compression)) {
355 if(myself->compression < 0 || myself->compression > 11) {
356 logger(LOG_ERR, _("Bogus compression level!"));
360 myself->compression = 0;
362 myself->connection->outcompression = 0;
366 myself->nexthop = myself;
367 myself->via = myself;
368 myself->status.reachable = true;
378 event_set(&device_ev, device_fd, EV_READ|EV_PERSIST,
379 handle_device_data, NULL);
380 if (event_add(&device_ev, NULL) < 0) {
381 logger(LOG_ERR, _("event_add failed: %s"), strerror(errno));
386 /* Run tinc-up script to further initialize the tap interface */
387 asprintf(&envp[0], "NETNAME=%s", netname ? : "");
388 asprintf(&envp[1], "DEVICE=%s", device ? : "");
389 asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
390 asprintf(&envp[3], "NAME=%s", myself->name);
393 execute_script("tinc-up", envp);
395 for(i = 0; i < 5; i++)
398 /* Run subnet-up scripts for our own subnets */
400 subnet_update(myself, NULL, true);
404 get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
406 hint.ai_family = addressfamily;
407 hint.ai_socktype = SOCK_STREAM;
408 hint.ai_protocol = IPPROTO_TCP;
409 hint.ai_flags = AI_PASSIVE;
411 err = getaddrinfo(address, myport, &hint, &ai);
414 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
421 for(aip = ai; aip; aip = aip->ai_next) {
422 listen_socket[listen_sockets].tcp =
423 setup_listen_socket((sockaddr_t *) aip->ai_addr);
425 if(listen_socket[listen_sockets].tcp < 0)
428 listen_socket[listen_sockets].udp =
429 setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
431 if(listen_socket[listen_sockets].udp < 0) {
432 close(listen_socket[listen_sockets].tcp);
436 event_set(&listen_socket[listen_sockets].ev_tcp,
437 listen_socket[listen_sockets].tcp,
439 handle_new_meta_connection, NULL);
440 if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
441 logger(LOG_EMERG, _("event_add failed: %s"), strerror(errno));
445 event_set(&listen_socket[listen_sockets].ev_udp,
446 listen_socket[listen_sockets].udp,
448 handle_incoming_vpn_data, NULL);
449 if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
450 logger(LOG_EMERG, _("event_add failed: %s"), strerror(errno));
454 ifdebug(CONNECTIONS) {
455 hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
456 logger(LOG_NOTICE, _("Listening on %s"), hostname);
460 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
463 if(listen_sockets >= MAXSOCKETS) {
464 logger(LOG_WARNING, _("Maximum of %d listening sockets reached"), MAXSOCKETS);
472 logger(LOG_NOTICE, _("Ready"));
474 logger(LOG_ERR, _("Unable to create any listening socket!"));
482 setup all initial network connections
484 bool setup_network_connections(void) {
493 if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
494 if(pinginterval < 1) {
495 pinginterval = 86400;
500 if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
502 if(pingtimeout < 1 || pingtimeout > pinginterval)
503 pingtimeout = pinginterval;
505 if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
506 maxoutbufsize = 4 * MTU;
511 try_outgoing_connections();
517 close all open network connections
519 void close_network_connections(void) {
520 splay_node_t *node, *next;
527 for(node = connection_tree->head; node; node = next) {
533 freeaddrinfo(c->outgoing->ai);
534 free(c->outgoing->name);
539 terminate_connection(c, false);
542 if(myself && myself->connection) {
543 subnet_update(myself, NULL, false);
544 terminate_connection(myself->connection, false);
547 for(i = 0; i < listen_sockets; i++) {
548 event_del(&listen_socket[i].ev_tcp);
549 event_del(&listen_socket[i].ev_udp);
550 close(listen_socket[i].tcp);
551 close(listen_socket[i].udp);
554 asprintf(&envp[0], "NETNAME=%s", netname ? : "");
555 asprintf(&envp[1], "DEVICE=%s", device ? : "");
556 asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
557 asprintf(&envp[3], "NAME=%s", myself->name);
566 execute_script("tinc-down", envp);
568 for(i = 0; i < 4; i++)