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.
25 #include <openssl/pem.h>
26 #include <openssl/rsa.h>
27 #include <openssl/rand.h>
28 #include <openssl/err.h>
29 #include <openssl/evp.h>
31 #include "splay_tree.h"
33 #include "connection.h"
47 static struct event device_ev;
49 bool read_rsa_public_key(connection_t *c) {
57 c->rsa_key = RSA_new();
58 // RSA_blinding_on(c->rsa_key, NULL);
61 /* First, check for simple PublicKey statement */
63 if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
64 BN_hex2bn(&c->rsa_key->n, key);
65 BN_hex2bn(&c->rsa_key->e, "FFFF");
70 /* Else, check for PublicKeyFile statement and read it */
72 if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
73 fp = fopen(fname, "r");
76 logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
77 fname, strerror(errno));
83 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
87 return true; /* Woohoo. */
89 /* If it fails, try PEM_read_RSA_PUBKEY. */
90 fp = fopen(fname, "r");
93 logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
94 fname, strerror(errno));
100 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
104 // RSA_blinding_on(c->rsa_key, NULL);
108 logger(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"),
109 fname, strerror(errno));
113 /* Else, check if a harnessed public key is in the config file */
115 asprintf(&fname, "%s/hosts/%s", confbase, c->name);
116 fp = fopen(fname, "r");
119 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
128 /* Try again with PEM_read_RSA_PUBKEY. */
130 asprintf(&fname, "%s/hosts/%s", confbase, c->name);
131 fp = fopen(fname, "r");
134 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
135 // RSA_blinding_on(c->rsa_key, NULL);
144 logger(LOG_ERR, _("No public key for %s specified!"), c->name);
149 bool read_rsa_private_key(void) {
151 char *fname, *key, *pubkey;
156 if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
157 if(!get_config_string(lookup_config(myself->connection->config_tree, "PublicKey"), &pubkey)) {
158 logger(LOG_ERR, _("PrivateKey used but no PublicKey found!"));
161 myself->connection->rsa_key = RSA_new();
162 // RSA_blinding_on(myself->connection->rsa_key, NULL);
163 BN_hex2bn(&myself->connection->rsa_key->d, key);
164 BN_hex2bn(&myself->connection->rsa_key->n, pubkey);
165 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
171 if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
172 asprintf(&fname, "%s/rsa_key.priv", confbase);
174 fp = fopen(fname, "r");
177 logger(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
178 fname, strerror(errno));
183 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
184 if(fstat(fileno(fp), &s)) {
185 logger(LOG_ERR, _("Could not stat RSA private key file `%s': %s'"),
186 fname, strerror(errno));
191 if(s.st_mode & ~0100700)
192 logger(LOG_WARNING, _("Warning: insecure file permissions for RSA private key file `%s'!"), fname);
195 myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
198 if(!myself->connection->rsa_key) {
199 logger(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"),
200 fname, strerror(errno));
209 static struct event keyexpire_event;
211 static void keyexpire_handler(int fd, short events, void *data) {
215 void regenerate_key() {
216 RAND_pseudo_bytes((unsigned char *)myself->key, myself->keylength);
218 if(timeout_initialized(&keyexpire_event)) {
219 ifdebug(STATUS) logger(LOG_INFO, _("Regenerating symmetric key"));
220 event_del(&keyexpire_event);
221 send_key_changed(broadcast, myself);
223 timeout_set(&keyexpire_event, keyexpire_handler, NULL);
226 event_add(&keyexpire_event, &(struct timeval){keylifetime, 0});
229 EVP_CIPHER_CTX_init(&packet_ctx);
230 if(!EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, (unsigned char *)myself->key, (unsigned char *)myself->key + myself->cipher->key_len)) {
231 logger(LOG_ERR, _("Error during initialisation of cipher for %s (%s): %s"),
232 myself->name, myself->hostname, ERR_error_string(ERR_get_error(), NULL));
240 Configure node_t myself and set up the local sockets (listen only)
242 bool setup_myself(void) {
245 char *name, *hostname, *mode, *afname, *cipher, *digest;
246 char *address = NULL;
248 struct addrinfo *ai, *aip, hint = {0};
255 myself->connection = new_connection();
256 init_configuration(&myself->connection->config_tree);
258 asprintf(&myself->hostname, _("MYSELF"));
259 asprintf(&myself->connection->hostname, _("MYSELF"));
261 myself->connection->options = 0;
262 myself->connection->protocol_version = PROT_CURRENT;
264 if(!get_config_string(lookup_config(config_tree, "Name"), &name)) { /* Not acceptable */
265 logger(LOG_ERR, _("Name for tinc daemon required!"));
269 if(!check_id(name)) {
270 logger(LOG_ERR, _("Invalid name for myself!"));
276 myself->connection->name = xstrdup(name);
278 if(!read_connection_config(myself->connection)) {
279 logger(LOG_ERR, _("Cannot open host configuration file for myself!"));
283 if(!read_rsa_private_key())
286 if(!get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myport))
287 asprintf(&myport, "655");
289 /* Read in all the subnets specified in the host configuration file */
291 cfg = lookup_config(myself->connection->config_tree, "Subnet");
294 if(!get_config_subnet(cfg, &subnet))
297 subnet_add(myself, subnet);
299 cfg = lookup_config_next(myself->connection->config_tree, cfg);
302 /* Check some options */
304 if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
305 myself->options |= OPTION_INDIRECT;
307 if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
308 myself->options |= OPTION_TCPONLY;
310 if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice) && choice)
311 myself->options |= OPTION_INDIRECT;
313 if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice) && choice)
314 myself->options |= OPTION_TCPONLY;
316 if(get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) && choice)
317 myself->options |= OPTION_PMTU_DISCOVERY;
319 if(myself->options & OPTION_TCPONLY)
320 myself->options |= OPTION_INDIRECT;
322 get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
324 if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
325 if(!strcasecmp(mode, "router"))
326 routing_mode = RMODE_ROUTER;
327 else if(!strcasecmp(mode, "switch"))
328 routing_mode = RMODE_SWITCH;
329 else if(!strcasecmp(mode, "hub"))
330 routing_mode = RMODE_HUB;
332 logger(LOG_ERR, _("Invalid routing mode!"));
337 routing_mode = RMODE_ROUTER;
339 get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
341 #if !defined(SOL_IP) || !defined(IP_TOS)
342 if(priorityinheritance)
343 logger(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
346 if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
349 if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
350 if(maxtimeout <= 0) {
351 logger(LOG_ERR, _("Bogus maximum timeout!"));
357 if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
358 if(!strcasecmp(afname, "IPv4"))
359 addressfamily = AF_INET;
360 else if(!strcasecmp(afname, "IPv6"))
361 addressfamily = AF_INET6;
362 else if(!strcasecmp(afname, "any"))
363 addressfamily = AF_UNSPEC;
365 logger(LOG_ERR, _("Invalid address family!"));
371 get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
373 /* Generate packet encryption key */
376 (lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) {
377 if(!strcasecmp(cipher, "none")) {
378 myself->cipher = NULL;
380 myself->cipher = EVP_get_cipherbyname(cipher);
382 if(!myself->cipher) {
383 logger(LOG_ERR, _("Unrecognized cipher type!"));
388 myself->cipher = EVP_bf_cbc();
391 myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
393 myself->keylength = 1;
395 myself->connection->outcipher = EVP_bf_ofb();
397 myself->key = xmalloc(myself->keylength);
399 if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
403 /* Check if we want to use message authentication codes... */
406 (lookup_config(myself->connection->config_tree, "Digest"), &digest)) {
407 if(!strcasecmp(digest, "none")) {
408 myself->digest = NULL;
410 myself->digest = EVP_get_digestbyname(digest);
412 if(!myself->digest) {
413 logger(LOG_ERR, _("Unrecognized digest type!"));
418 myself->digest = EVP_sha1();
420 myself->connection->outdigest = EVP_sha1();
422 if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"),
423 &myself->maclength)) {
425 if(myself->maclength > myself->digest->md_size) {
426 logger(LOG_ERR, _("MAC length exceeds size of digest!"));
428 } else if(myself->maclength < 0) {
429 logger(LOG_ERR, _("Bogus MAC length!"));
434 myself->maclength = 4;
436 myself->connection->outmaclength = 0;
440 if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"),
441 &myself->compression)) {
442 if(myself->compression < 0 || myself->compression > 11) {
443 logger(LOG_ERR, _("Bogus compression level!"));
447 myself->compression = 0;
449 myself->connection->outcompression = 0;
453 myself->nexthop = myself;
454 myself->via = myself;
455 myself->status.reachable = true;
465 event_set(&device_ev, device_fd, EV_READ|EV_PERSIST,
466 handle_device_data, NULL);
467 if (event_add(&device_ev, NULL) < 0) {
468 logger(LOG_ERR, _("event_add failed: %s"), strerror(errno));
473 /* Run tinc-up script to further initialize the tap interface */
474 asprintf(&envp[0], "NETNAME=%s", netname ? : "");
475 asprintf(&envp[1], "DEVICE=%s", device ? : "");
476 asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
477 asprintf(&envp[3], "NAME=%s", myself->name);
480 execute_script("tinc-up", envp);
482 for(i = 0; i < 5; i++)
485 /* Run subnet-up scripts for our own subnets */
487 subnet_update(myself, NULL, true);
491 get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
493 hint.ai_family = addressfamily;
494 hint.ai_socktype = SOCK_STREAM;
495 hint.ai_protocol = IPPROTO_TCP;
496 hint.ai_flags = AI_PASSIVE;
498 err = getaddrinfo(address, myport, &hint, &ai);
501 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
508 for(aip = ai; aip; aip = aip->ai_next) {
509 listen_socket[listen_sockets].tcp =
510 setup_listen_socket((sockaddr_t *) aip->ai_addr);
512 if(listen_socket[listen_sockets].tcp < 0)
515 listen_socket[listen_sockets].udp =
516 setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
518 if(listen_socket[listen_sockets].udp < 0) {
519 close(listen_socket[listen_sockets].tcp);
523 event_set(&listen_socket[listen_sockets].ev_tcp,
524 listen_socket[listen_sockets].tcp,
526 handle_new_meta_connection, NULL);
527 if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
528 logger(LOG_WARNING, _("event_add failed: %s"), strerror(errno));
529 close(listen_socket[listen_sockets].tcp);
530 close(listen_socket[listen_sockets].udp);
534 event_set(&listen_socket[listen_sockets].ev_udp,
535 listen_socket[listen_sockets].udp,
537 handle_incoming_vpn_data, NULL);
538 if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
539 logger(LOG_WARNING, _("event_add failed: %s"), strerror(errno));
540 close(listen_socket[listen_sockets].tcp);
541 close(listen_socket[listen_sockets].udp);
542 event_del(&listen_socket[listen_sockets].ev_tcp);
546 ifdebug(CONNECTIONS) {
547 hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
548 logger(LOG_NOTICE, _("Listening on %s"), hostname);
552 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
555 if(listen_sockets >= MAXSOCKETS) {
556 logger(LOG_WARNING, _("Maximum of %d listening sockets reached"), MAXSOCKETS);
564 logger(LOG_NOTICE, _("Ready"));
566 logger(LOG_ERR, _("Unable to create any listening socket!"));
574 setup all initial network connections
576 bool setup_network_connections(void) {
585 if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
586 if(pinginterval < 1) {
587 pinginterval = 86400;
592 if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
594 if(pingtimeout < 1 || pingtimeout > pinginterval)
595 pingtimeout = pinginterval;
597 if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
598 maxoutbufsize = 4 * MTU;
603 try_outgoing_connections();
609 close all open network connections
611 void close_network_connections(void) {
612 splay_node_t *node, *next;
619 for(node = connection_tree->head; node; node = next) {
625 freeaddrinfo(c->outgoing->ai);
626 free(c->outgoing->name);
631 terminate_connection(c, false);
634 if(myself && myself->connection) {
635 subnet_update(myself, NULL, false);
636 terminate_connection(myself->connection, false);
639 for(i = 0; i < listen_sockets; i++) {
640 event_del(&listen_socket[i].ev_tcp);
641 event_del(&listen_socket[i].ev_udp);
642 close(listen_socket[i].tcp);
643 close(listen_socket[i].udp);
646 asprintf(&envp[0], "NETNAME=%s", netname ? : "");
647 asprintf(&envp[1], "DEVICE=%s", device ? : "");
648 asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
649 asprintf(&envp[3], "NAME=%s", myself->name);
658 execute_script("tinc-down", envp);
660 for(i = 0; i < 4; i++)