3 Copyright (C) 1998-2005 Ivo Timmermans,
4 2000-2010 Guus Sliepen <guus@tinc-vpn.org>
5 2006 Scott Lamb <slamb@slamb.org>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License along
18 with this program; if not, write to the Free Software Foundation, Inc.,
19 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 #include <openssl/pem.h>
25 #include <openssl/rsa.h>
26 #include <openssl/rand.h>
27 #include <openssl/err.h>
28 #include <openssl/evp.h>
32 #include "connection.h"
48 bool read_rsa_public_key(connection_t *c) {
54 c->rsa_key = RSA_new();
55 // RSA_blinding_on(c->rsa_key, NULL);
58 /* First, check for simple PublicKey statement */
60 if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
61 BN_hex2bn(&c->rsa_key->n, key);
62 BN_hex2bn(&c->rsa_key->e, "FFFF");
67 /* Else, check for PublicKeyFile statement and read it */
69 if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
70 fp = fopen(fname, "r");
73 logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
74 fname, strerror(errno));
80 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
84 return true; /* Woohoo. */
86 /* If it fails, try PEM_read_RSA_PUBKEY. */
87 fp = fopen(fname, "r");
90 logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
91 fname, strerror(errno));
97 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
101 // RSA_blinding_on(c->rsa_key, NULL);
105 logger(LOG_ERR, "Reading RSA public key file `%s' failed: %s",
106 fname, strerror(errno));
110 /* Else, check if a harnessed public key is in the config file */
112 xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
113 fp = fopen(fname, "r");
116 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
125 /* Try again with PEM_read_RSA_PUBKEY. */
127 xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
128 fp = fopen(fname, "r");
131 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
132 // RSA_blinding_on(c->rsa_key, NULL);
141 logger(LOG_ERR, "No public key for %s specified!", c->name);
146 bool read_rsa_private_key(void) {
148 char *fname, *key, *pubkey;
151 if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
152 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &pubkey)) {
153 logger(LOG_ERR, "PrivateKey used but no PublicKey found!");
156 myself->connection->rsa_key = RSA_new();
157 // RSA_blinding_on(myself->connection->rsa_key, NULL);
158 BN_hex2bn(&myself->connection->rsa_key->d, key);
159 BN_hex2bn(&myself->connection->rsa_key->n, pubkey);
160 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
166 if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
167 xasprintf(&fname, "%s/rsa_key.priv", confbase);
169 fp = fopen(fname, "r");
172 logger(LOG_ERR, "Error reading RSA private key file `%s': %s",
173 fname, strerror(errno));
178 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
179 if(fstat(fileno(fp), &s)) {
180 logger(LOG_ERR, "Could not stat RSA private key file `%s': %s'",
181 fname, strerror(errno));
186 if(s.st_mode & ~0100700)
187 logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
190 myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
193 if(!myself->connection->rsa_key) {
194 logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s",
195 fname, strerror(errno));
205 Read Subnets from all host config files
207 void load_all_subnets(void) {
212 avl_tree_t *config_tree;
218 xasprintf(&dname, "%s/hosts", confbase);
219 dir = opendir(dname);
221 logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
226 while((ent = readdir(dir))) {
227 if(!check_id(ent->d_name))
230 n = lookup_node(ent->d_name);
231 #ifdef _DIRENT_HAVE_D_TYPE
232 //if(ent->d_type != DT_REG)
236 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
237 init_configuration(&config_tree);
238 result = read_config_file(config_tree, fname);
245 n->name = xstrdup(ent->d_name);
249 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
250 if(!get_config_subnet(cfg, &s))
253 if((s2 = lookup_subnet(n, s))) {
260 exit_configuration(&config_tree);
267 Configure node_t myself and set up the local sockets (listen only)
269 bool setup_myself(void) {
272 char *name, *hostname, *mode, *afname, *cipher, *digest;
274 char *address = NULL;
276 struct addrinfo *ai, *aip, hint = {0};
282 myself->connection = new_connection();
284 myself->hostname = xstrdup("MYSELF");
285 myself->connection->hostname = xstrdup("MYSELF");
287 myself->connection->options = 0;
288 myself->connection->protocol_version = PROT_CURRENT;
290 if(!get_config_string(lookup_config(config_tree, "Name"), &name)) { /* Not acceptable */
291 logger(LOG_ERR, "Name for tinc daemon required!");
295 if(!check_id(name)) {
296 logger(LOG_ERR, "Invalid name for myself!");
302 myself->connection->name = xstrdup(name);
303 xasprintf(&fname, "%s/hosts/%s", confbase, name);
304 read_config_options(config_tree, name);
305 read_config_file(config_tree, fname);
308 if(!read_rsa_private_key())
311 if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
312 myport = xstrdup("655");
315 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
317 if(!ai || !ai->ai_addr)
320 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
321 sockaddr2str(&sa, NULL, &myport);
324 /* Read in all the subnets specified in the host configuration file */
326 cfg = lookup_config(config_tree, "Subnet");
329 if(!get_config_subnet(cfg, &subnet))
332 subnet_add(myself, subnet);
334 cfg = lookup_config_next(config_tree, cfg);
337 /* Check some options */
339 if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
340 myself->options |= OPTION_INDIRECT;
342 if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
343 myself->options |= OPTION_TCPONLY;
345 if(myself->options & OPTION_TCPONLY)
346 myself->options |= OPTION_INDIRECT;
348 get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
349 get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
350 get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
351 strictsubnets |= tunnelserver;
353 if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
354 if(!strcasecmp(mode, "router"))
355 routing_mode = RMODE_ROUTER;
356 else if(!strcasecmp(mode, "switch"))
357 routing_mode = RMODE_SWITCH;
358 else if(!strcasecmp(mode, "hub"))
359 routing_mode = RMODE_HUB;
361 logger(LOG_ERR, "Invalid routing mode!");
367 if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
368 if(!strcasecmp(mode, "off"))
369 forwarding_mode = FMODE_OFF;
370 else if(!strcasecmp(mode, "internal"))
371 forwarding_mode = FMODE_INTERNAL;
372 else if(!strcasecmp(mode, "kernel"))
373 forwarding_mode = FMODE_KERNEL;
375 logger(LOG_ERR, "Invalid forwarding mode!");
382 get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
384 myself->options |= OPTION_PMTU_DISCOVERY;
387 get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
389 myself->options |= OPTION_CLAMP_MSS;
391 get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
393 #if !defined(SOL_IP) || !defined(IP_TOS)
394 if(priorityinheritance)
395 logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
398 if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
401 if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
402 if(maxtimeout <= 0) {
403 logger(LOG_ERR, "Bogus maximum timeout!");
409 if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
410 if(udp_rcvbuf <= 0) {
411 logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
416 if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
417 if(udp_sndbuf <= 0) {
418 logger(LOG_ERR, "UDPSndBuf cannot be negative!");
423 if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
424 if(replaywin_int < 0) {
425 logger(LOG_ERR, "ReplayWindow cannot be negative!");
428 replaywin = (unsigned)replaywin_int;
431 if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
432 if(!strcasecmp(afname, "IPv4"))
433 addressfamily = AF_INET;
434 else if(!strcasecmp(afname, "IPv6"))
435 addressfamily = AF_INET6;
436 else if(!strcasecmp(afname, "any"))
437 addressfamily = AF_UNSPEC;
439 logger(LOG_ERR, "Invalid address family!");
445 get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
447 /* Generate packet encryption key */
450 (lookup_config(config_tree, "Cipher"), &cipher)) {
451 if(!strcasecmp(cipher, "none")) {
452 myself->incipher = NULL;
454 myself->incipher = EVP_get_cipherbyname(cipher);
456 if(!myself->incipher) {
457 logger(LOG_ERR, "Unrecognized cipher type!");
462 myself->incipher = EVP_bf_cbc();
465 myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len;
467 myself->inkeylength = 1;
469 myself->connection->outcipher = EVP_bf_ofb();
471 if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
474 keyexpires = now + keylifetime;
476 /* Check if we want to use message authentication codes... */
478 if(get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
479 if(!strcasecmp(digest, "none")) {
480 myself->indigest = NULL;
482 myself->indigest = EVP_get_digestbyname(digest);
484 if(!myself->indigest) {
485 logger(LOG_ERR, "Unrecognized digest type!");
490 myself->indigest = EVP_sha1();
492 myself->connection->outdigest = EVP_sha1();
494 if(get_config_int(lookup_config(config_tree, "MACLength"), &myself->inmaclength)) {
495 if(myself->indigest) {
496 if(myself->inmaclength > myself->indigest->md_size) {
497 logger(LOG_ERR, "MAC length exceeds size of digest!");
499 } else if(myself->inmaclength < 0) {
500 logger(LOG_ERR, "Bogus MAC length!");
505 myself->inmaclength = 4;
507 myself->connection->outmaclength = 0;
511 if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
512 if(myself->incompression < 0 || myself->incompression > 11) {
513 logger(LOG_ERR, "Bogus compression level!");
517 myself->incompression = 0;
519 myself->connection->outcompression = 0;
523 myself->nexthop = myself;
524 myself->via = myself;
525 myself->status.reachable = true;
538 /* Run tinc-up script to further initialize the tap interface */
539 xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
540 xasprintf(&envp[1], "DEVICE=%s", device ? : "");
541 xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
542 xasprintf(&envp[3], "NAME=%s", myself->name);
545 execute_script("tinc-up", envp);
547 for(i = 0; i < 5; i++)
550 /* Run subnet-up scripts for our own subnets */
552 subnet_update(myself, NULL, true);
556 get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
558 hint.ai_family = addressfamily;
559 hint.ai_socktype = SOCK_STREAM;
560 hint.ai_protocol = IPPROTO_TCP;
561 hint.ai_flags = AI_PASSIVE;
563 err = getaddrinfo(address, myport, &hint, &ai);
566 logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
573 for(aip = ai; aip; aip = aip->ai_next) {
574 listen_socket[listen_sockets].tcp =
575 setup_listen_socket((sockaddr_t *) aip->ai_addr);
577 if(listen_socket[listen_sockets].tcp < 0)
580 listen_socket[listen_sockets].udp =
581 setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
583 if(listen_socket[listen_sockets].udp < 0)
586 ifdebug(CONNECTIONS) {
587 hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
588 logger(LOG_NOTICE, "Listening on %s", hostname);
592 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
599 logger(LOG_NOTICE, "Ready");
601 logger(LOG_ERR, "Unable to create any listening socket!");
611 bool setup_network(void) {
621 if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
622 if(pinginterval < 1) {
623 pinginterval = 86400;
628 if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
630 if(pingtimeout < 1 || pingtimeout > pinginterval)
631 pingtimeout = pinginterval;
633 if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
634 maxoutbufsize = 10 * MTU;
643 close all open network connections
645 void close_network_connections(void) {
646 avl_node_t *node, *next;
651 for(node = connection_tree->head; node; node = next) {
655 terminate_connection(c, false);
658 for(list_node_t *node = outgoing_list->head; node; node = node->next) {
659 outgoing_t *outgoing = node->data;
662 event_del(outgoing->event);
665 list_delete_list(outgoing_list);
667 if(myself && myself->connection) {
668 subnet_update(myself, NULL, false);
669 terminate_connection(myself->connection, false);
670 free_connection(myself->connection);
673 for(i = 0; i < listen_sockets; i++) {
674 close(listen_socket[i].tcp);
675 close(listen_socket[i].udp);
678 xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
679 xasprintf(&envp[1], "DEVICE=%s", device ? : "");
680 xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
681 xasprintf(&envp[3], "NAME=%s", myself->name);
691 execute_script("tinc-down", envp);
693 if(myport) free(myport);
695 for(i = 0; i < 4; i++)