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>
33 #include "connection.h"
48 static struct event device_ev;
50 bool read_rsa_public_key(connection_t *c)
59 c->rsa_key = RSA_new();
60 // RSA_blinding_on(c->rsa_key, NULL);
63 /* First, check for simple PublicKey statement */
65 if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
66 BN_hex2bn(&c->rsa_key->n, key);
67 BN_hex2bn(&c->rsa_key->e, "FFFF");
72 /* Else, check for PublicKeyFile statement and read it */
74 if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
75 fp = fopen(fname, "r");
78 logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
79 fname, strerror(errno));
85 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
89 return true; /* Woohoo. */
91 /* If it fails, try PEM_read_RSA_PUBKEY. */
92 fp = fopen(fname, "r");
95 logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
96 fname, strerror(errno));
102 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
106 // RSA_blinding_on(c->rsa_key, NULL);
110 logger(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"),
111 fname, strerror(errno));
115 /* Else, check if a harnessed public key is in the config file */
117 asprintf(&fname, "%s/hosts/%s", confbase, c->name);
118 fp = fopen(fname, "r");
121 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
130 /* Try again with PEM_read_RSA_PUBKEY. */
132 asprintf(&fname, "%s/hosts/%s", confbase, c->name);
133 fp = fopen(fname, "r");
136 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
137 // RSA_blinding_on(c->rsa_key, NULL);
146 logger(LOG_ERR, _("No public key for %s specified!"), c->name);
151 bool read_rsa_private_key(void)
154 char *fname, *key, *pubkey;
159 if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
160 if(!get_config_string(lookup_config(myself->connection->config_tree, "PublicKey"), &pubkey)) {
161 logger(LOG_ERR, _("PrivateKey used but no PublicKey found!"));
164 myself->connection->rsa_key = RSA_new();
165 // RSA_blinding_on(myself->connection->rsa_key, NULL);
166 BN_hex2bn(&myself->connection->rsa_key->d, key);
167 BN_hex2bn(&myself->connection->rsa_key->n, pubkey);
168 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
174 if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
175 asprintf(&fname, "%s/rsa_key.priv", confbase);
177 fp = fopen(fname, "r");
180 logger(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
181 fname, strerror(errno));
186 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
187 if(fstat(fileno(fp), &s)) {
188 logger(LOG_ERR, _("Could not stat RSA private key file `%s': %s'"),
189 fname, strerror(errno));
194 if(s.st_mode & ~0100700)
195 logger(LOG_WARNING, _("Warning: insecure file permissions for RSA private key file `%s'!"), fname);
198 myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
201 if(!myself->connection->rsa_key) {
202 logger(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"),
203 fname, strerror(errno));
213 Configure node_t myself and set up the local sockets (listen only)
215 bool setup_myself(void)
219 char *name, *hostname, *mode, *afname, *cipher, *digest;
220 char *address = NULL;
222 struct addrinfo *ai, *aip, hint = {0};
229 myself->connection = new_connection();
230 init_configuration(&myself->connection->config_tree);
232 asprintf(&myself->hostname, _("MYSELF"));
233 asprintf(&myself->connection->hostname, _("MYSELF"));
235 myself->connection->options = 0;
236 myself->connection->protocol_version = PROT_CURRENT;
238 if(!get_config_string(lookup_config(config_tree, "Name"), &name)) { /* Not acceptable */
239 logger(LOG_ERR, _("Name for tinc daemon required!"));
243 if(!check_id(name)) {
244 logger(LOG_ERR, _("Invalid name for myself!"));
250 myself->connection->name = xstrdup(name);
252 if(!read_connection_config(myself->connection)) {
253 logger(LOG_ERR, _("Cannot open host configuration file for myself!"));
257 if(!read_rsa_private_key())
260 if(!get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myport))
261 asprintf(&myport, "655");
263 /* Read in all the subnets specified in the host configuration file */
265 cfg = lookup_config(myself->connection->config_tree, "Subnet");
268 if(!get_config_subnet(cfg, &subnet))
271 subnet_add(myself, subnet);
273 cfg = lookup_config_next(myself->connection->config_tree, cfg);
276 /* Check some options */
278 if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
279 myself->options |= OPTION_INDIRECT;
281 if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
282 myself->options |= OPTION_TCPONLY;
284 if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice) && choice)
285 myself->options |= OPTION_INDIRECT;
287 if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice) && choice)
288 myself->options |= OPTION_TCPONLY;
290 if(get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) && choice)
291 myself->options |= OPTION_PMTU_DISCOVERY;
293 if(myself->options & OPTION_TCPONLY)
294 myself->options |= OPTION_INDIRECT;
296 get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
298 if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
299 if(!strcasecmp(mode, "router"))
300 routing_mode = RMODE_ROUTER;
301 else if(!strcasecmp(mode, "switch"))
302 routing_mode = RMODE_SWITCH;
303 else if(!strcasecmp(mode, "hub"))
304 routing_mode = RMODE_HUB;
306 logger(LOG_ERR, _("Invalid routing mode!"));
311 routing_mode = RMODE_ROUTER;
313 get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
315 #if !defined(SOL_IP) || !defined(IP_TOS)
316 if(priorityinheritance)
317 logger(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
320 if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
323 if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
324 if(maxtimeout <= 0) {
325 logger(LOG_ERR, _("Bogus maximum timeout!"));
331 if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
332 if(!strcasecmp(afname, "IPv4"))
333 addressfamily = AF_INET;
334 else if(!strcasecmp(afname, "IPv6"))
335 addressfamily = AF_INET6;
336 else if(!strcasecmp(afname, "any"))
337 addressfamily = AF_UNSPEC;
339 logger(LOG_ERR, _("Invalid address family!"));
345 get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
347 /* Generate packet encryption key */
350 (lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) {
351 if(!strcasecmp(cipher, "none")) {
352 myself->cipher = NULL;
354 myself->cipher = EVP_get_cipherbyname(cipher);
356 if(!myself->cipher) {
357 logger(LOG_ERR, _("Unrecognized cipher type!"));
362 myself->cipher = EVP_bf_cbc();
365 myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
367 myself->keylength = 1;
369 myself->connection->outcipher = EVP_bf_ofb();
371 myself->key = xmalloc(myself->keylength);
372 RAND_pseudo_bytes((unsigned char *)myself->key, myself->keylength);
374 if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
377 keyexpires = now + keylifetime;
380 EVP_CIPHER_CTX_init(&packet_ctx);
381 if(!EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, (unsigned char *)myself->key, (unsigned char *)myself->key + myself->cipher->key_len)) {
382 logger(LOG_ERR, _("Error during initialisation of cipher for %s (%s): %s"),
383 myself->name, myself->hostname, ERR_error_string(ERR_get_error(), NULL));
389 /* Check if we want to use message authentication codes... */
392 (lookup_config(myself->connection->config_tree, "Digest"), &digest)) {
393 if(!strcasecmp(digest, "none")) {
394 myself->digest = NULL;
396 myself->digest = EVP_get_digestbyname(digest);
398 if(!myself->digest) {
399 logger(LOG_ERR, _("Unrecognized digest type!"));
404 myself->digest = EVP_sha1();
406 myself->connection->outdigest = EVP_sha1();
408 if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"),
409 &myself->maclength)) {
411 if(myself->maclength > myself->digest->md_size) {
412 logger(LOG_ERR, _("MAC length exceeds size of digest!"));
414 } else if(myself->maclength < 0) {
415 logger(LOG_ERR, _("Bogus MAC length!"));
420 myself->maclength = 4;
422 myself->connection->outmaclength = 0;
426 if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"),
427 &myself->compression)) {
428 if(myself->compression < 0 || myself->compression > 11) {
429 logger(LOG_ERR, _("Bogus compression level!"));
433 myself->compression = 0;
435 myself->connection->outcompression = 0;
439 myself->nexthop = myself;
440 myself->via = myself;
441 myself->status.reachable = true;
451 event_set(&device_ev, device_fd, EV_READ|EV_PERSIST,
452 handle_device_data, NULL);
453 if (event_add(&device_ev, NULL) < 0) {
454 logger(LOG_ERR, _("event_add failed: %s"), strerror(errno));
459 /* Run tinc-up script to further initialize the tap interface */
460 asprintf(&envp[0], "NETNAME=%s", netname ? : "");
461 asprintf(&envp[1], "DEVICE=%s", device ? : "");
462 asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
463 asprintf(&envp[3], "NAME=%s", myself->name);
466 execute_script("tinc-up", envp);
468 for(i = 0; i < 5; i++)
471 /* Run subnet-up scripts for our own subnets */
473 subnet_update(myself, NULL, true);
477 get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
479 hint.ai_family = addressfamily;
480 hint.ai_socktype = SOCK_STREAM;
481 hint.ai_protocol = IPPROTO_TCP;
482 hint.ai_flags = AI_PASSIVE;
484 err = getaddrinfo(address, myport, &hint, &ai);
487 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
494 for(aip = ai; aip; aip = aip->ai_next) {
495 listen_socket[listen_sockets].tcp =
496 setup_listen_socket((sockaddr_t *) aip->ai_addr);
498 if(listen_socket[listen_sockets].tcp < 0)
501 listen_socket[listen_sockets].udp =
502 setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
504 if(listen_socket[listen_sockets].udp < 0) {
505 close(listen_socket[listen_sockets].tcp);
509 event_set(&listen_socket[listen_sockets].ev_tcp,
510 listen_socket[listen_sockets].tcp,
512 handle_new_meta_connection, NULL);
513 if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
514 logger(LOG_WARNING, _("event_add failed: %s"), strerror(errno));
515 close(listen_socket[listen_sockets].tcp);
516 close(listen_socket[listen_sockets].udp);
520 event_set(&listen_socket[listen_sockets].ev_udp,
521 listen_socket[listen_sockets].udp,
523 handle_incoming_vpn_data, NULL);
524 if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
525 logger(LOG_WARNING, _("event_add failed: %s"), strerror(errno));
526 close(listen_socket[listen_sockets].tcp);
527 close(listen_socket[listen_sockets].udp);
528 event_del(&listen_socket[listen_sockets].ev_tcp);
532 ifdebug(CONNECTIONS) {
533 hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
534 logger(LOG_NOTICE, _("Listening on %s"), hostname);
538 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
545 logger(LOG_NOTICE, _("Ready"));
547 logger(LOG_ERR, _("Unable to create any listening socket!"));
555 setup all initial network connections
557 bool setup_network_connections(void)
570 if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
571 if(pinginterval < 1) {
572 pinginterval = 86400;
577 if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
579 if(pingtimeout < 1 || pingtimeout > pinginterval)
580 pingtimeout = pinginterval;
582 if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
583 maxoutbufsize = 4 * MTU;
588 try_outgoing_connections();
594 close all open network connections
596 void close_network_connections(void)
598 avl_node_t *node, *next;
605 for(node = connection_tree->head; node; node = next) {
611 freeaddrinfo(c->outgoing->ai);
612 free(c->outgoing->name);
617 terminate_connection(c, false);
620 if(myself && myself->connection) {
621 subnet_update(myself, NULL, false);
622 terminate_connection(myself->connection, false);
625 for(i = 0; i < listen_sockets; i++) {
626 close(listen_socket[i].tcp);
627 close(listen_socket[i].udp);
630 asprintf(&envp[0], "NETNAME=%s", netname ? : "");
631 asprintf(&envp[1], "DEVICE=%s", device ? : "");
632 asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
633 asprintf(&envp[3], "NAME=%s", myself->name);
643 execute_script("tinc-down", envp);
645 for(i = 0; i < 4; i++)