3 Copyright (C) 1998-2005 Ivo Timmermans,
4 2000-2012 Guus Sliepen <guus@tinc-vpn.org>
5 2006 Scott Lamb <slamb@slamb.org>
6 2010 Brandon Black <blblack@gmail.com>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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"
50 bool read_rsa_public_key(connection_t *c) {
56 c->rsa_key = RSA_new();
57 // RSA_blinding_on(c->rsa_key, NULL);
60 /* First, check for simple PublicKey statement */
62 if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
63 BN_hex2bn(&c->rsa_key->n, key);
64 BN_hex2bn(&c->rsa_key->e, "FFFF");
69 /* Else, check for PublicKeyFile statement and read it */
71 if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
72 fp = fopen(fname, "r");
75 logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
76 fname, strerror(errno));
82 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
86 return true; /* Woohoo. */
88 /* If it fails, try PEM_read_RSA_PUBKEY. */
89 fp = fopen(fname, "r");
92 logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
93 fname, strerror(errno));
99 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
103 // RSA_blinding_on(c->rsa_key, NULL);
107 logger(LOG_ERR, "Reading RSA public key file `%s' failed: %s",
108 fname, strerror(errno));
112 /* Else, check if a harnessed public key is in the config file */
114 xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
115 fp = fopen(fname, "r");
118 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
123 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
130 /* Try again with PEM_read_RSA_PUBKEY. */
132 xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
133 fp = fopen(fname, "r");
136 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
141 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
142 // RSA_blinding_on(c->rsa_key, NULL);
149 logger(LOG_ERR, "No public key for %s specified!", c->name);
154 static bool read_rsa_private_key(void) {
156 char *fname, *key, *pubkey;
159 if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
160 if(!get_config_string(lookup_config(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 xasprintf(&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 Read Subnets from all host config files
215 void load_all_subnets(void) {
220 avl_tree_t *config_tree;
226 xasprintf(&dname, "%s/hosts", confbase);
227 dir = opendir(dname);
229 logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
234 while((ent = readdir(dir))) {
235 if(!check_id(ent->d_name))
238 n = lookup_node(ent->d_name);
239 #ifdef _DIRENT_HAVE_D_TYPE
240 //if(ent->d_type != DT_REG)
244 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
245 init_configuration(&config_tree);
246 result = read_config_file(config_tree, fname);
253 n->name = xstrdup(ent->d_name);
257 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
258 if(!get_config_subnet(cfg, &s))
261 if((s2 = lookup_subnet(n, s))) {
268 exit_configuration(&config_tree);
275 Configure node_t myself and set up the local sockets (listen only)
277 static bool setup_myself(void) {
280 char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
282 char *address = NULL;
284 struct addrinfo *ai, *aip, hint = {0};
290 myself->connection = new_connection();
292 myself->hostname = xstrdup("MYSELF");
293 myself->connection->hostname = xstrdup("MYSELF");
295 myself->connection->options = 0;
296 myself->connection->protocol_version = PROT_CURRENT;
298 if(!get_config_string(lookup_config(config_tree, "Name"), &name)) { /* Not acceptable */
299 logger(LOG_ERR, "Name for tinc daemon required!");
303 if(!check_id(name)) {
304 logger(LOG_ERR, "Invalid name for myself!");
310 myself->connection->name = xstrdup(name);
311 xasprintf(&fname, "%s/hosts/%s", confbase, name);
312 read_config_options(config_tree, name);
313 read_config_file(config_tree, fname);
316 if(!read_rsa_private_key())
319 if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
320 myport = xstrdup("655");
323 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
325 if(!ai || !ai->ai_addr)
328 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
329 sockaddr2str(&sa, NULL, &myport);
332 /* Read in all the subnets specified in the host configuration file */
334 cfg = lookup_config(config_tree, "Subnet");
337 if(!get_config_subnet(cfg, &subnet))
340 subnet_add(myself, subnet);
342 cfg = lookup_config_next(config_tree, cfg);
345 /* Check some options */
347 if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
348 myself->options |= OPTION_INDIRECT;
350 if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
351 myself->options |= OPTION_TCPONLY;
353 if(myself->options & OPTION_TCPONLY)
354 myself->options |= OPTION_INDIRECT;
356 get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
357 get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
358 get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
359 strictsubnets |= tunnelserver;
361 if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
362 if(!strcasecmp(mode, "router"))
363 routing_mode = RMODE_ROUTER;
364 else if(!strcasecmp(mode, "switch"))
365 routing_mode = RMODE_SWITCH;
366 else if(!strcasecmp(mode, "hub"))
367 routing_mode = RMODE_HUB;
369 logger(LOG_ERR, "Invalid routing mode!");
375 if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
376 if(!strcasecmp(mode, "off"))
377 forwarding_mode = FMODE_OFF;
378 else if(!strcasecmp(mode, "internal"))
379 forwarding_mode = FMODE_INTERNAL;
380 else if(!strcasecmp(mode, "kernel"))
381 forwarding_mode = FMODE_KERNEL;
383 logger(LOG_ERR, "Invalid forwarding mode!");
390 get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
392 myself->options |= OPTION_PMTU_DISCOVERY;
395 get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
397 myself->options |= OPTION_CLAMP_MSS;
399 get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
400 get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
401 get_config_bool(lookup_config(config_tree, "Broadcast"), &broadcast);
403 #if !defined(SOL_IP) || !defined(IP_TOS)
404 if(priorityinheritance)
405 logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
408 if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
411 if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
412 if(maxtimeout <= 0) {
413 logger(LOG_ERR, "Bogus maximum timeout!");
419 if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
420 if(udp_rcvbuf <= 0) {
421 logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
426 if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
427 if(udp_sndbuf <= 0) {
428 logger(LOG_ERR, "UDPSndBuf cannot be negative!");
433 if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
434 if(replaywin_int < 0) {
435 logger(LOG_ERR, "ReplayWindow cannot be negative!");
438 replaywin = (unsigned)replaywin_int;
441 if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
442 if(!strcasecmp(afname, "IPv4"))
443 addressfamily = AF_INET;
444 else if(!strcasecmp(afname, "IPv6"))
445 addressfamily = AF_INET6;
446 else if(!strcasecmp(afname, "any"))
447 addressfamily = AF_UNSPEC;
449 logger(LOG_ERR, "Invalid address family!");
455 get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
457 /* Generate packet encryption key */
460 (lookup_config(config_tree, "Cipher"), &cipher)) {
461 if(!strcasecmp(cipher, "none")) {
462 myself->incipher = NULL;
464 myself->incipher = EVP_get_cipherbyname(cipher);
466 if(!myself->incipher) {
467 logger(LOG_ERR, "Unrecognized cipher type!");
472 myself->incipher = EVP_bf_cbc();
475 myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len;
477 myself->inkeylength = 1;
479 myself->connection->outcipher = EVP_bf_ofb();
481 if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
484 keyexpires = now + keylifetime;
486 /* Check if we want to use message authentication codes... */
488 if(get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
489 if(!strcasecmp(digest, "none")) {
490 myself->indigest = NULL;
492 myself->indigest = EVP_get_digestbyname(digest);
494 if(!myself->indigest) {
495 logger(LOG_ERR, "Unrecognized digest type!");
500 myself->indigest = EVP_sha1();
502 myself->connection->outdigest = EVP_sha1();
504 if(get_config_int(lookup_config(config_tree, "MACLength"), &myself->inmaclength)) {
505 if(myself->indigest) {
506 if(myself->inmaclength > myself->indigest->md_size) {
507 logger(LOG_ERR, "MAC length exceeds size of digest!");
509 } else if(myself->inmaclength < 0) {
510 logger(LOG_ERR, "Bogus MAC length!");
515 myself->inmaclength = 4;
517 myself->connection->outmaclength = 0;
521 if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
522 if(myself->incompression < 0 || myself->incompression > 11) {
523 logger(LOG_ERR, "Bogus compression level!");
527 myself->incompression = 0;
529 myself->connection->outcompression = 0;
533 myself->nexthop = myself;
534 myself->via = myself;
535 myself->status.reachable = true;
547 if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
548 if(!strcasecmp(type, "dummy"))
549 devops = dummy_devops;
550 else if(!strcasecmp(type, "raw_socket"))
551 devops = raw_socket_devops;
553 else if(!strcasecmp(type, "uml"))
557 else if(!strcasecmp(type, "vde"))
565 /* Run tinc-up script to further initialize the tap interface */
566 xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
567 xasprintf(&envp[1], "DEVICE=%s", device ? : "");
568 xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
569 xasprintf(&envp[3], "NAME=%s", myself->name);
572 execute_script("tinc-up", envp);
574 for(i = 0; i < 5; i++)
577 /* Run subnet-up scripts for our own subnets */
579 subnet_update(myself, NULL, true);
583 cfg = lookup_config(config_tree, "BindToAddress");
586 get_config_string(cfg, &address);
588 cfg = lookup_config_next(config_tree, cfg);
590 hint.ai_family = addressfamily;
591 hint.ai_socktype = SOCK_STREAM;
592 hint.ai_protocol = IPPROTO_TCP;
593 hint.ai_flags = AI_PASSIVE;
595 err = getaddrinfo(address, myport, &hint, &ai);
599 logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
606 for(aip = ai; aip; aip = aip->ai_next) {
607 listen_socket[listen_sockets].tcp =
608 setup_listen_socket((sockaddr_t *) aip->ai_addr);
610 if(listen_socket[listen_sockets].tcp < 0)
613 listen_socket[listen_sockets].udp =
614 setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
616 if(listen_socket[listen_sockets].udp < 0)
619 ifdebug(CONNECTIONS) {
620 hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
621 logger(LOG_NOTICE, "Listening on %s", hostname);
625 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
633 logger(LOG_NOTICE, "Ready");
635 logger(LOG_ERR, "Unable to create any listening socket!");
645 bool setup_network(void) {
655 if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
656 if(pinginterval < 1) {
657 pinginterval = 86400;
662 if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
664 if(pingtimeout < 1 || pingtimeout > pinginterval)
665 pingtimeout = pinginterval;
667 if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
668 maxoutbufsize = 10 * MTU;
677 close all open network connections
679 void close_network_connections(void) {
680 avl_node_t *node, *next;
685 for(node = connection_tree->head; node; node = next) {
689 terminate_connection(c, false);
692 for(list_node_t *node = outgoing_list->head; node; node = node->next) {
693 outgoing_t *outgoing = node->data;
696 event_del(outgoing->event);
699 list_delete_list(outgoing_list);
701 if(myself && myself->connection) {
702 subnet_update(myself, NULL, false);
703 terminate_connection(myself->connection, false);
704 free_connection(myself->connection);
707 for(i = 0; i < listen_sockets; i++) {
708 close(listen_socket[i].tcp);
709 close(listen_socket[i].udp);
712 xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
713 xasprintf(&envp[1], "DEVICE=%s", device ? : "");
714 xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
715 xasprintf(&envp[3], "NAME=%s", myself->name);
725 execute_script("tinc-down", envp);
727 if(myport) free(myport);
729 for(i = 0; i < 4; i++)