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"
48 static struct event device_ev;
50 bool read_rsa_public_key(connection_t *c) {
58 c->rsa_key = RSA_new();
59 // RSA_blinding_on(c->rsa_key, NULL);
62 /* First, check for simple PublicKey statement */
64 if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
65 BN_hex2bn(&c->rsa_key->n, key);
66 BN_hex2bn(&c->rsa_key->e, "FFFF");
71 /* Else, check for PublicKeyFile statement and read it */
73 if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
74 fp = fopen(fname, "r");
77 logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
78 fname, strerror(errno));
84 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
88 return true; /* Woohoo. */
90 /* If it fails, try PEM_read_RSA_PUBKEY. */
91 fp = fopen(fname, "r");
94 logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
95 fname, strerror(errno));
101 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
105 // RSA_blinding_on(c->rsa_key, NULL);
109 logger(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"),
110 fname, strerror(errno));
114 /* Else, check if a harnessed public key is in the config file */
116 asprintf(&fname, "%s/hosts/%s", confbase, c->name);
117 fp = fopen(fname, "r");
120 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
129 /* Try again with PEM_read_RSA_PUBKEY. */
131 asprintf(&fname, "%s/hosts/%s", confbase, c->name);
132 fp = fopen(fname, "r");
135 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
136 // RSA_blinding_on(c->rsa_key, NULL);
145 logger(LOG_ERR, _("No public key for %s specified!"), c->name);
150 bool read_rsa_private_key(void) {
152 char *fname, *key, *pubkey;
157 if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
158 if(!get_config_string(lookup_config(myself->connection->config_tree, "PublicKey"), &pubkey)) {
159 logger(LOG_ERR, _("PrivateKey used but no PublicKey found!"));
162 myself->connection->rsa_key = RSA_new();
163 // RSA_blinding_on(myself->connection->rsa_key, NULL);
164 BN_hex2bn(&myself->connection->rsa_key->d, key);
165 BN_hex2bn(&myself->connection->rsa_key->n, pubkey);
166 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
172 if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
173 asprintf(&fname, "%s/rsa_key.priv", confbase);
175 fp = fopen(fname, "r");
178 logger(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
179 fname, strerror(errno));
184 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
185 if(fstat(fileno(fp), &s)) {
186 logger(LOG_ERR, _("Could not stat RSA private key file `%s': %s'"),
187 fname, strerror(errno));
192 if(s.st_mode & ~0100700)
193 logger(LOG_WARNING, _("Warning: insecure file permissions for RSA private key file `%s'!"), fname);
196 myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
199 if(!myself->connection->rsa_key) {
200 logger(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"),
201 fname, strerror(errno));
210 static struct event keyexpire_event;
212 static void keyexpire_handler(int fd, short events, void *data) {
216 void regenerate_key() {
217 RAND_pseudo_bytes((unsigned char *)myself->key, myself->keylength);
219 if(timeout_initialized(&keyexpire_event)) {
220 ifdebug(STATUS) logger(LOG_INFO, _("Regenerating symmetric key"));
221 event_del(&keyexpire_event);
222 send_key_changed(broadcast, myself);
224 timeout_set(&keyexpire_event, keyexpire_handler, NULL);
227 event_add(&keyexpire_event, &(struct timeval){keylifetime, 0});
230 EVP_CIPHER_CTX_init(&packet_ctx);
231 if(!EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, (unsigned char *)myself->key, (unsigned char *)myself->key + myself->cipher->key_len)) {
232 logger(LOG_ERR, _("Error during initialisation of cipher for %s (%s): %s"),
233 myself->name, myself->hostname, ERR_error_string(ERR_get_error(), NULL));
241 Configure node_t myself and set up the local sockets (listen only)
243 bool setup_myself(void) {
246 char *name, *hostname, *mode, *afname, *cipher, *digest;
247 char *address = NULL;
249 struct addrinfo *ai, *aip, hint = {0};
256 myself->connection = new_connection();
257 init_configuration(&myself->connection->config_tree);
259 asprintf(&myself->hostname, _("MYSELF"));
260 asprintf(&myself->connection->hostname, _("MYSELF"));
262 myself->connection->options = 0;
263 myself->connection->protocol_version = PROT_CURRENT;
265 if(!get_config_string(lookup_config(config_tree, "Name"), &name)) { /* Not acceptable */
266 logger(LOG_ERR, _("Name for tinc daemon required!"));
270 if(!check_id(name)) {
271 logger(LOG_ERR, _("Invalid name for myself!"));
277 myself->connection->name = xstrdup(name);
279 if(!read_connection_config(myself->connection)) {
280 logger(LOG_ERR, _("Cannot open host configuration file for myself!"));
284 if(!read_rsa_private_key())
287 if(!get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myport))
288 asprintf(&myport, "655");
290 /* Read in all the subnets specified in the host configuration file */
292 cfg = lookup_config(myself->connection->config_tree, "Subnet");
295 if(!get_config_subnet(cfg, &subnet))
298 subnet_add(myself, subnet);
300 cfg = lookup_config_next(myself->connection->config_tree, cfg);
303 /* Check some options */
305 if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
306 myself->options |= OPTION_INDIRECT;
308 if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
309 myself->options |= OPTION_TCPONLY;
311 if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice) && choice)
312 myself->options |= OPTION_INDIRECT;
314 if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice) && choice)
315 myself->options |= OPTION_TCPONLY;
317 if(get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) && choice)
318 myself->options |= OPTION_PMTU_DISCOVERY;
320 if(myself->options & OPTION_TCPONLY)
321 myself->options |= OPTION_INDIRECT;
323 get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
325 if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
326 if(!strcasecmp(mode, "router"))
327 routing_mode = RMODE_ROUTER;
328 else if(!strcasecmp(mode, "switch"))
329 routing_mode = RMODE_SWITCH;
330 else if(!strcasecmp(mode, "hub"))
331 routing_mode = RMODE_HUB;
333 logger(LOG_ERR, _("Invalid routing mode!"));
338 routing_mode = RMODE_ROUTER;
340 get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
342 #if !defined(SOL_IP) || !defined(IP_TOS)
343 if(priorityinheritance)
344 logger(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
347 if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
350 if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
351 if(maxtimeout <= 0) {
352 logger(LOG_ERR, _("Bogus maximum timeout!"));
358 if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
359 if(!strcasecmp(afname, "IPv4"))
360 addressfamily = AF_INET;
361 else if(!strcasecmp(afname, "IPv6"))
362 addressfamily = AF_INET6;
363 else if(!strcasecmp(afname, "any"))
364 addressfamily = AF_UNSPEC;
366 logger(LOG_ERR, _("Invalid address family!"));
372 get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
374 /* Generate packet encryption key */
377 (lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) {
378 if(!strcasecmp(cipher, "none")) {
379 myself->cipher = NULL;
381 myself->cipher = EVP_get_cipherbyname(cipher);
383 if(!myself->cipher) {
384 logger(LOG_ERR, _("Unrecognized cipher type!"));
389 myself->cipher = EVP_bf_cbc();
392 myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
394 myself->keylength = 1;
396 myself->connection->outcipher = EVP_bf_ofb();
398 myself->key = xmalloc(myself->keylength);
400 if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
404 /* Check if we want to use message authentication codes... */
407 (lookup_config(myself->connection->config_tree, "Digest"), &digest)) {
408 if(!strcasecmp(digest, "none")) {
409 myself->digest = NULL;
411 myself->digest = EVP_get_digestbyname(digest);
413 if(!myself->digest) {
414 logger(LOG_ERR, _("Unrecognized digest type!"));
419 myself->digest = EVP_sha1();
421 myself->connection->outdigest = EVP_sha1();
423 if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"),
424 &myself->maclength)) {
426 if(myself->maclength > myself->digest->md_size) {
427 logger(LOG_ERR, _("MAC length exceeds size of digest!"));
429 } else if(myself->maclength < 0) {
430 logger(LOG_ERR, _("Bogus MAC length!"));
435 myself->maclength = 4;
437 myself->connection->outmaclength = 0;
441 if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"),
442 &myself->compression)) {
443 if(myself->compression < 0 || myself->compression > 11) {
444 logger(LOG_ERR, _("Bogus compression level!"));
448 myself->compression = 0;
450 myself->connection->outcompression = 0;
454 myself->nexthop = myself;
455 myself->via = myself;
456 myself->status.reachable = true;
466 event_set(&device_ev, device_fd, EV_READ|EV_PERSIST,
467 handle_device_data, NULL);
468 if (event_add(&device_ev, NULL) < 0) {
469 logger(LOG_ERR, _("event_add failed: %s"), strerror(errno));
474 /* Run tinc-up script to further initialize the tap interface */
475 asprintf(&envp[0], "NETNAME=%s", netname ? : "");
476 asprintf(&envp[1], "DEVICE=%s", device ? : "");
477 asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
478 asprintf(&envp[3], "NAME=%s", myself->name);
481 execute_script("tinc-up", envp);
483 for(i = 0; i < 5; i++)
486 /* Run subnet-up scripts for our own subnets */
488 subnet_update(myself, NULL, true);
492 get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
494 hint.ai_family = addressfamily;
495 hint.ai_socktype = SOCK_STREAM;
496 hint.ai_protocol = IPPROTO_TCP;
497 hint.ai_flags = AI_PASSIVE;
499 err = getaddrinfo(address, myport, &hint, &ai);
502 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
509 for(aip = ai; aip; aip = aip->ai_next) {
510 listen_socket[listen_sockets].tcp =
511 setup_listen_socket((sockaddr_t *) aip->ai_addr);
513 if(listen_socket[listen_sockets].tcp < 0)
516 listen_socket[listen_sockets].udp =
517 setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
519 if(listen_socket[listen_sockets].udp < 0) {
520 close(listen_socket[listen_sockets].tcp);
524 event_set(&listen_socket[listen_sockets].ev_tcp,
525 listen_socket[listen_sockets].tcp,
527 handle_new_meta_connection, NULL);
528 if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
529 logger(LOG_EMERG, _("event_add failed: %s"), strerror(errno));
533 event_set(&listen_socket[listen_sockets].ev_udp,
534 listen_socket[listen_sockets].udp,
536 handle_incoming_vpn_data, NULL);
537 if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
538 logger(LOG_EMERG, _("event_add failed: %s"), strerror(errno));
542 ifdebug(CONNECTIONS) {
543 hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
544 logger(LOG_NOTICE, _("Listening on %s"), hostname);
548 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
551 if(listen_sockets >= MAXSOCKETS) {
552 logger(LOG_WARNING, _("Maximum of %d listening sockets reached"), MAXSOCKETS);
560 logger(LOG_NOTICE, _("Ready"));
562 logger(LOG_ERR, _("Unable to create any listening socket!"));
570 setup all initial network connections
572 bool setup_network_connections(void) {
581 if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
582 if(pinginterval < 1) {
583 pinginterval = 86400;
588 if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
590 if(pingtimeout < 1 || pingtimeout > pinginterval)
591 pingtimeout = pinginterval;
593 if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
594 maxoutbufsize = 4 * MTU;
599 try_outgoing_connections();
605 close all open network connections
607 void close_network_connections(void) {
608 splay_node_t *node, *next;
615 for(node = connection_tree->head; node; node = next) {
621 freeaddrinfo(c->outgoing->ai);
622 free(c->outgoing->name);
627 terminate_connection(c, false);
630 if(myself && myself->connection) {
631 subnet_update(myself, NULL, false);
632 terminate_connection(myself->connection, false);
635 for(i = 0; i < listen_sockets; i++) {
636 event_del(&listen_socket[i].ev_tcp);
637 event_del(&listen_socket[i].ev_udp);
638 close(listen_socket[i].tcp);
639 close(listen_socket[i].udp);
642 asprintf(&envp[0], "NETNAME=%s", netname ? : "");
643 asprintf(&envp[1], "DEVICE=%s", device ? : "");
644 asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
645 asprintf(&envp[3], "NAME=%s", myself->name);
654 execute_script("tinc-down", envp);
656 for(i = 0; i < 4; i++)