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;
225 xasprintf(&dname, "%s/hosts", confbase);
226 dir = opendir(dname);
228 logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
233 while((ent = readdir(dir))) {
234 if(!check_id(ent->d_name))
237 n = lookup_node(ent->d_name);
238 #ifdef _DIRENT_HAVE_D_TYPE
239 //if(ent->d_type != DT_REG)
243 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
244 init_configuration(&config_tree);
245 read_config_options(config_tree, ent->d_name);
246 read_config_file(config_tree, fname);
251 n->name = xstrdup(ent->d_name);
255 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
256 if(!get_config_subnet(cfg, &s))
259 if((s2 = lookup_subnet(n, s))) {
266 exit_configuration(&config_tree);
272 char *get_name(void) {
275 get_config_string(lookup_config(config_tree, "Name"), &name);
281 char *envname = getenv(name + 1);
283 if(strcmp(name + 1, "HOST")) {
284 fprintf(stderr, "Invalid Name: environment variable %s does not exist\n", name + 1);
287 envname = alloca(32);
288 if(gethostname(envname, 32)) {
289 fprintf(stderr, "Could not get hostname: %s\n", strerror(errno));
295 name = xstrdup(envname);
296 for(char *c = name; *c; c++)
301 if(!check_id(name)) {
302 logger(LOG_ERR, "Invalid name for myself!");
311 Configure node_t myself and set up the local sockets (listen only)
313 static bool setup_myself(void) {
316 char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
318 char *address = NULL;
320 struct addrinfo *ai, *aip, hint = {0};
326 myself->connection = new_connection();
328 myself->hostname = xstrdup("MYSELF");
329 myself->connection->hostname = xstrdup("MYSELF");
331 myself->connection->options = 0;
332 myself->connection->protocol_version = PROT_CURRENT;
334 if(!(name = get_name())) {
335 logger(LOG_ERR, "Name for tinc daemon required!");
340 myself->connection->name = xstrdup(name);
341 xasprintf(&fname, "%s/hosts/%s", confbase, name);
342 read_config_options(config_tree, name);
343 read_config_file(config_tree, fname);
346 if(!read_rsa_private_key())
349 if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
350 myport = xstrdup("655");
353 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
355 if(!ai || !ai->ai_addr)
358 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
359 sockaddr2str(&sa, NULL, &myport);
362 /* Read in all the subnets specified in the host configuration file */
364 cfg = lookup_config(config_tree, "Subnet");
367 if(!get_config_subnet(cfg, &subnet))
370 subnet_add(myself, subnet);
372 cfg = lookup_config_next(config_tree, cfg);
375 /* Check some options */
377 if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
378 myself->options |= OPTION_INDIRECT;
380 if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
381 myself->options |= OPTION_TCPONLY;
383 if(myself->options & OPTION_TCPONLY)
384 myself->options |= OPTION_INDIRECT;
386 get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
387 get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
388 get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
389 get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
390 strictsubnets |= tunnelserver;
392 if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
393 if(!strcasecmp(mode, "router"))
394 routing_mode = RMODE_ROUTER;
395 else if(!strcasecmp(mode, "switch"))
396 routing_mode = RMODE_SWITCH;
397 else if(!strcasecmp(mode, "hub"))
398 routing_mode = RMODE_HUB;
400 logger(LOG_ERR, "Invalid routing mode!");
406 if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
407 if(!strcasecmp(mode, "off"))
408 forwarding_mode = FMODE_OFF;
409 else if(!strcasecmp(mode, "internal"))
410 forwarding_mode = FMODE_INTERNAL;
411 else if(!strcasecmp(mode, "kernel"))
412 forwarding_mode = FMODE_KERNEL;
414 logger(LOG_ERR, "Invalid forwarding mode!");
421 get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
423 myself->options |= OPTION_PMTU_DISCOVERY;
426 get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
428 myself->options |= OPTION_CLAMP_MSS;
430 get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
431 get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
432 get_config_bool(lookup_config(config_tree, "Broadcast"), &broadcast);
434 #if !defined(SOL_IP) || !defined(IP_TOS)
435 if(priorityinheritance)
436 logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
439 if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
442 if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
443 if(maxtimeout <= 0) {
444 logger(LOG_ERR, "Bogus maximum timeout!");
450 if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
451 if(udp_rcvbuf <= 0) {
452 logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
457 if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
458 if(udp_sndbuf <= 0) {
459 logger(LOG_ERR, "UDPSndBuf cannot be negative!");
464 if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
465 if(replaywin_int < 0) {
466 logger(LOG_ERR, "ReplayWindow cannot be negative!");
469 replaywin = (unsigned)replaywin_int;
472 if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
473 if(!strcasecmp(afname, "IPv4"))
474 addressfamily = AF_INET;
475 else if(!strcasecmp(afname, "IPv6"))
476 addressfamily = AF_INET6;
477 else if(!strcasecmp(afname, "any"))
478 addressfamily = AF_UNSPEC;
480 logger(LOG_ERR, "Invalid address family!");
486 get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
488 /* Generate packet encryption key */
491 (lookup_config(config_tree, "Cipher"), &cipher)) {
492 if(!strcasecmp(cipher, "none")) {
493 myself->incipher = NULL;
495 myself->incipher = EVP_get_cipherbyname(cipher);
497 if(!myself->incipher) {
498 logger(LOG_ERR, "Unrecognized cipher type!");
503 myself->incipher = EVP_bf_cbc();
506 myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len;
508 myself->inkeylength = 1;
510 myself->connection->outcipher = EVP_bf_ofb();
512 if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
515 keyexpires = now + keylifetime;
517 /* Check if we want to use message authentication codes... */
519 if(get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
520 if(!strcasecmp(digest, "none")) {
521 myself->indigest = NULL;
523 myself->indigest = EVP_get_digestbyname(digest);
525 if(!myself->indigest) {
526 logger(LOG_ERR, "Unrecognized digest type!");
531 myself->indigest = EVP_sha1();
533 myself->connection->outdigest = EVP_sha1();
535 if(get_config_int(lookup_config(config_tree, "MACLength"), &myself->inmaclength)) {
536 if(myself->indigest) {
537 if(myself->inmaclength > myself->indigest->md_size) {
538 logger(LOG_ERR, "MAC length exceeds size of digest!");
540 } else if(myself->inmaclength < 0) {
541 logger(LOG_ERR, "Bogus MAC length!");
546 myself->inmaclength = 4;
548 myself->connection->outmaclength = 0;
552 if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
553 if(myself->incompression < 0 || myself->incompression > 11) {
554 logger(LOG_ERR, "Bogus compression level!");
558 myself->incompression = 0;
560 myself->connection->outcompression = 0;
564 myself->nexthop = myself;
565 myself->via = myself;
566 myself->status.reachable = true;
578 if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
579 if(!strcasecmp(type, "dummy"))
580 devops = dummy_devops;
581 else if(!strcasecmp(type, "raw_socket"))
582 devops = raw_socket_devops;
583 else if(!strcasecmp(type, "multicast"))
584 devops = multicast_devops;
586 else if(!strcasecmp(type, "uml"))
590 else if(!strcasecmp(type, "vde"))
598 /* Run tinc-up script to further initialize the tap interface */
599 xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
600 xasprintf(&envp[1], "DEVICE=%s", device ? : "");
601 xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
602 xasprintf(&envp[3], "NAME=%s", myself->name);
605 execute_script("tinc-up", envp);
607 for(i = 0; i < 5; i++)
610 /* Run subnet-up scripts for our own subnets */
612 subnet_update(myself, NULL, true);
616 if(!do_detach && getenv("LISTEN_FDS")) {
620 listen_sockets = atoi(getenv("LISTEN_FDS"));
622 unsetenv("LISTEN_FDS");
625 if(listen_sockets > MAXSOCKETS) {
626 logger(LOG_ERR, "Too many listening sockets");
630 for(i = 0; i < listen_sockets; i++) {
632 if(getsockname(i + 3, &sa.sa, &salen) < 0) {
633 logger(LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
637 listen_socket[i].tcp = i + 3;
640 fcntl(i + 3, F_SETFD, FD_CLOEXEC);
643 listen_socket[i].udp = setup_vpn_in_socket(&sa);
644 if(listen_socket[i].udp < 0)
647 ifdebug(CONNECTIONS) {
648 hostname = sockaddr2hostname(&sa);
649 logger(LOG_NOTICE, "Listening on %s", hostname);
653 memcpy(&listen_socket[i].sa, &sa, salen);
657 cfg = lookup_config(config_tree, "BindToAddress");
660 get_config_string(cfg, &address);
662 cfg = lookup_config_next(config_tree, cfg);
667 char *space = strchr(address, ' ');
673 if(!strcmp(address, "*"))
677 hint.ai_family = addressfamily;
678 hint.ai_socktype = SOCK_STREAM;
679 hint.ai_protocol = IPPROTO_TCP;
680 hint.ai_flags = AI_PASSIVE;
682 err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
686 logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
691 for(aip = ai; aip; aip = aip->ai_next) {
692 if(listen_sockets >= MAXSOCKETS) {
693 logger(LOG_ERR, "Too many listening sockets");
697 listen_socket[listen_sockets].tcp =
698 setup_listen_socket((sockaddr_t *) aip->ai_addr);
700 if(listen_socket[listen_sockets].tcp < 0)
703 listen_socket[listen_sockets].udp =
704 setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
706 if(listen_socket[listen_sockets].udp < 0)
709 ifdebug(CONNECTIONS) {
710 hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
711 logger(LOG_NOTICE, "Listening on %s", hostname);
715 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
724 logger(LOG_NOTICE, "Ready");
726 logger(LOG_ERR, "Unable to create any listening socket!");
736 bool setup_network(void) {
746 if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
747 if(pinginterval < 1) {
748 pinginterval = 86400;
753 if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
755 if(pingtimeout < 1 || pingtimeout > pinginterval)
756 pingtimeout = pinginterval;
758 if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
759 maxoutbufsize = 10 * MTU;
768 close all open network connections
770 void close_network_connections(void) {
771 avl_node_t *node, *next;
776 for(node = connection_tree->head; node; node = next) {
780 terminate_connection(c, false);
783 for(list_node_t *node = outgoing_list->head; node; node = node->next) {
784 outgoing_t *outgoing = node->data;
787 event_del(outgoing->event);
790 list_delete_list(outgoing_list);
792 if(myself && myself->connection) {
793 subnet_update(myself, NULL, false);
794 terminate_connection(myself->connection, false);
795 free_connection(myself->connection);
798 for(i = 0; i < listen_sockets; i++) {
799 close(listen_socket[i].tcp);
800 close(listen_socket[i].udp);
803 xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
804 xasprintf(&envp[1], "DEVICE=%s", device ? : "");
805 xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
806 xasprintf(&envp[3], "NAME=%s", myself->name);
816 execute_script("tinc-down", envp);
818 if(myport) free(myport);
820 for(i = 0; i < 4; i++)