3 Copyright (C) 1998-2005 Ivo Timmermans,
4 2000-2013 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"
54 proxytype_t proxytype;
56 bool read_rsa_public_key(connection_t *c) {
63 c->rsa_key = RSA_new();
64 // RSA_blinding_on(c->rsa_key, NULL);
67 /* First, check for simple PublicKey statement */
69 if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
70 if(BN_hex2bn(&c->rsa_key->n, key) != strlen(key)) {
71 logger(LOG_ERR, "Invalid PublicKey for %s!", c->name);
74 BN_hex2bn(&c->rsa_key->e, "FFFF");
79 /* Else, check for PublicKeyFile statement and read it */
81 if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &pubname)) {
82 fp = fopen(pubname, "r");
85 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", pubname, strerror(errno));
90 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
95 return true; /* Woohoo. */
98 /* If it fails, try PEM_read_RSA_PUBKEY. */
99 fp = fopen(pubname, "r");
102 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", pubname, strerror(errno));
107 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
111 // RSA_blinding_on(c->rsa_key, NULL);
116 logger(LOG_ERR, "Reading RSA public key file `%s' failed: %s", pubname, strerror(errno));
121 /* Else, check if a harnessed public key is in the config file */
123 xasprintf(&hcfname, "%s/hosts/%s", confbase, c->name);
124 fp = fopen(hcfname, "r");
127 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", hcfname, strerror(errno));
132 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
140 /* Try again with PEM_read_RSA_PUBKEY. */
142 fp = fopen(hcfname, "r");
145 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", hcfname, strerror(errno));
151 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
152 // RSA_blinding_on(c->rsa_key, NULL);
158 logger(LOG_ERR, "No public key for %s specified!", c->name);
163 static bool read_rsa_private_key(void) {
165 char *fname, *key, *pubkey;
167 if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
168 myself->connection->rsa_key = RSA_new();
169 // RSA_blinding_on(myself->connection->rsa_key, NULL);
170 if(BN_hex2bn(&myself->connection->rsa_key->d, key) != strlen(key)) {
171 logger(LOG_ERR, "Invalid PrivateKey for myself!");
176 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &pubkey)) {
177 logger(LOG_ERR, "PrivateKey used but no PublicKey found!");
180 if(BN_hex2bn(&myself->connection->rsa_key->n, pubkey) != strlen(pubkey)) {
181 logger(LOG_ERR, "Invalid PublicKey for myself!");
186 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
190 if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
191 xasprintf(&fname, "%s/rsa_key.priv", confbase);
193 fp = fopen(fname, "r");
196 logger(LOG_ERR, "Error reading RSA private key file `%s': %s",
197 fname, strerror(errno));
202 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
205 if(!fstat(fileno(fp), &s)) {
206 if(s.st_mode & ~0100700)
207 logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
209 logger(LOG_WARNING, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
213 myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
216 if(!myself->connection->rsa_key) {
217 logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s",
218 fname, strerror(errno));
228 Read Subnets from all host config files
230 void load_all_subnets(void) {
235 avl_tree_t *config_tree;
240 xasprintf(&dname, "%s/hosts", confbase);
241 dir = opendir(dname);
243 logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
248 while((ent = readdir(dir))) {
249 if(!check_id(ent->d_name))
252 n = lookup_node(ent->d_name);
253 #ifdef _DIRENT_HAVE_D_TYPE
254 //if(ent->d_type != DT_REG)
258 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
259 init_configuration(&config_tree);
260 read_config_options(config_tree, ent->d_name);
261 read_config_file(config_tree, fname);
266 n->name = xstrdup(ent->d_name);
270 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
271 if(!get_config_subnet(cfg, &s))
274 if((s2 = lookup_subnet(n, s))) {
281 exit_configuration(&config_tree);
287 char *get_name(void) {
290 get_config_string(lookup_config(config_tree, "Name"), &name);
296 char *envname = getenv(name + 1);
297 char hostname[32] = "";
299 if(strcmp(name + 1, "HOST")) {
300 fprintf(stderr, "Invalid Name: environment variable %s does not exist\n", name + 1);
304 if(gethostname(hostname, sizeof hostname) || !*hostname) {
305 fprintf(stderr, "Could not get hostname: %s\n", strerror(errno));
313 name = xstrdup(envname);
314 for(char *c = name; *c; c++)
319 if(!check_id(name)) {
320 logger(LOG_ERR, "Invalid name for myself!");
329 Configure node_t myself and set up the local sockets (listen only)
331 static bool setup_myself(void) {
334 char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
336 char *address = NULL;
339 char *envp[5] = {NULL};
340 struct addrinfo *ai, *aip, hint = {0};
344 bool port_specified = false;
347 myself->connection = new_connection();
349 myself->hostname = xstrdup("MYSELF");
350 myself->connection->hostname = xstrdup("MYSELF");
352 myself->connection->options = 0;
353 myself->connection->protocol_version = PROT_CURRENT;
355 if(!(name = get_name())) {
356 logger(LOG_ERR, "Name for tinc daemon required!");
360 /* Read tinc.conf and our own host config file */
363 myself->connection->name = xstrdup(name);
364 xasprintf(&fname, "%s/hosts/%s", confbase, name);
365 read_config_options(config_tree, name);
366 read_config_file(config_tree, fname);
369 if(!read_rsa_private_key())
372 if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
373 myport = xstrdup("655");
375 port_specified = true;
377 /* Ensure myport is numeric */
380 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
382 if(!ai || !ai->ai_addr)
385 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
386 sockaddr2str(&sa, NULL, &myport);
389 if(get_config_string(lookup_config(config_tree, "Proxy"), &proxy)) {
390 if((space = strchr(proxy, ' ')))
393 if(!strcasecmp(proxy, "none")) {
394 proxytype = PROXY_NONE;
395 } else if(!strcasecmp(proxy, "socks4")) {
396 proxytype = PROXY_SOCKS4;
397 } else if(!strcasecmp(proxy, "socks4a")) {
398 proxytype = PROXY_SOCKS4A;
399 } else if(!strcasecmp(proxy, "socks5")) {
400 proxytype = PROXY_SOCKS5;
401 } else if(!strcasecmp(proxy, "http")) {
402 proxytype = PROXY_HTTP;
403 } else if(!strcasecmp(proxy, "exec")) {
404 proxytype = PROXY_EXEC;
406 logger(LOG_ERR, "Unknown proxy type %s!", proxy);
416 if(!space || !*space) {
417 logger(LOG_ERR, "Argument expected for proxy type exec!");
420 proxyhost = xstrdup(space);
428 if(space && (space = strchr(space, ' ')))
429 *space++ = 0, proxyport = space;
430 if(space && (space = strchr(space, ' ')))
431 *space++ = 0, proxyuser = space;
432 if(space && (space = strchr(space, ' ')))
433 *space++ = 0, proxypass = space;
434 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
435 logger(LOG_ERR, "Host and port argument expected for proxy!");
438 proxyhost = xstrdup(proxyhost);
439 proxyport = xstrdup(proxyport);
440 if(proxyuser && *proxyuser)
441 proxyuser = xstrdup(proxyuser);
442 if(proxypass && *proxypass)
443 proxypass = xstrdup(proxypass);
450 /* Read in all the subnets specified in the host configuration file */
452 cfg = lookup_config(config_tree, "Subnet");
455 if(!get_config_subnet(cfg, &subnet))
458 subnet_add(myself, subnet);
460 cfg = lookup_config_next(config_tree, cfg);
463 /* Check some options */
465 if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
466 myself->options |= OPTION_INDIRECT;
468 if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
469 myself->options |= OPTION_TCPONLY;
471 if(myself->options & OPTION_TCPONLY)
472 myself->options |= OPTION_INDIRECT;
474 get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
475 get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
476 get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
477 get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
478 strictsubnets |= tunnelserver;
480 if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
481 if(!strcasecmp(mode, "router"))
482 routing_mode = RMODE_ROUTER;
483 else if(!strcasecmp(mode, "switch"))
484 routing_mode = RMODE_SWITCH;
485 else if(!strcasecmp(mode, "hub"))
486 routing_mode = RMODE_HUB;
488 logger(LOG_ERR, "Invalid routing mode!");
494 if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
495 if(!strcasecmp(mode, "off"))
496 forwarding_mode = FMODE_OFF;
497 else if(!strcasecmp(mode, "internal"))
498 forwarding_mode = FMODE_INTERNAL;
499 else if(!strcasecmp(mode, "kernel"))
500 forwarding_mode = FMODE_KERNEL;
502 logger(LOG_ERR, "Invalid forwarding mode!");
509 get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
511 myself->options |= OPTION_PMTU_DISCOVERY;
514 get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
516 myself->options |= OPTION_CLAMP_MSS;
518 get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
519 get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
520 if(get_config_string(lookup_config(config_tree, "Broadcast"), &mode)) {
521 if(!strcasecmp(mode, "no"))
522 broadcast_mode = BMODE_NONE;
523 else if(!strcasecmp(mode, "yes") || !strcasecmp(mode, "mst"))
524 broadcast_mode = BMODE_MST;
525 else if(!strcasecmp(mode, "direct"))
526 broadcast_mode = BMODE_DIRECT;
528 logger(LOG_ERR, "Invalid broadcast mode!");
534 #if !defined(SOL_IP) || !defined(IP_TOS)
535 if(priorityinheritance)
536 logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
539 if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
542 if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
543 if(maxtimeout <= 0) {
544 logger(LOG_ERR, "Bogus maximum timeout!");
550 if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
551 if(udp_rcvbuf <= 0) {
552 logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
557 if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
558 if(udp_sndbuf <= 0) {
559 logger(LOG_ERR, "UDPSndBuf cannot be negative!");
564 if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
565 if(replaywin_int < 0) {
566 logger(LOG_ERR, "ReplayWindow cannot be negative!");
569 replaywin = (unsigned)replaywin_int;
572 if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
573 if(!strcasecmp(afname, "IPv4"))
574 addressfamily = AF_INET;
575 else if(!strcasecmp(afname, "IPv6"))
576 addressfamily = AF_INET6;
577 else if(!strcasecmp(afname, "any"))
578 addressfamily = AF_UNSPEC;
580 logger(LOG_ERR, "Invalid address family!");
587 get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
589 /* Generate packet encryption key */
591 if(get_config_string(lookup_config(config_tree, "Cipher"), &cipher)) {
592 if(!strcasecmp(cipher, "none")) {
593 myself->incipher = NULL;
595 myself->incipher = EVP_get_cipherbyname(cipher);
597 if(!myself->incipher) {
598 logger(LOG_ERR, "Unrecognized cipher type!");
605 myself->incipher = EVP_bf_cbc();
608 myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len;
610 myself->inkeylength = 1;
612 myself->connection->outcipher = EVP_bf_ofb();
614 if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
617 keyexpires = now + keylifetime;
619 /* Check if we want to use message authentication codes... */
621 if(get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
622 if(!strcasecmp(digest, "none")) {
623 myself->indigest = NULL;
625 myself->indigest = EVP_get_digestbyname(digest);
627 if(!myself->indigest) {
628 logger(LOG_ERR, "Unrecognized digest type!");
636 myself->indigest = EVP_sha1();
638 myself->connection->outdigest = EVP_sha1();
640 if(get_config_int(lookup_config(config_tree, "MACLength"), &myself->inmaclength)) {
641 if(myself->indigest) {
642 if(myself->inmaclength > myself->indigest->md_size) {
643 logger(LOG_ERR, "MAC length exceeds size of digest!");
645 } else if(myself->inmaclength < 0) {
646 logger(LOG_ERR, "Bogus MAC length!");
651 myself->inmaclength = 4;
653 myself->connection->outmaclength = 0;
657 if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
658 if(myself->incompression < 0 || myself->incompression > 11) {
659 logger(LOG_ERR, "Bogus compression level!");
663 myself->incompression = 0;
665 myself->connection->outcompression = 0;
669 myself->nexthop = myself;
670 myself->via = myself;
671 myself->status.reachable = true;
683 if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
684 if(!strcasecmp(type, "dummy"))
685 devops = dummy_devops;
686 else if(!strcasecmp(type, "raw_socket"))
687 devops = raw_socket_devops;
688 else if(!strcasecmp(type, "multicast"))
689 devops = multicast_devops;
691 else if(!strcasecmp(type, "uml"))
695 else if(!strcasecmp(type, "vde"))
704 /* Run tinc-up script to further initialize the tap interface */
705 xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
706 xasprintf(&envp[1], "DEVICE=%s", device ? : "");
707 xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
708 xasprintf(&envp[3], "NAME=%s", myself->name);
710 execute_script("tinc-up", envp);
712 for(i = 0; i < 4; i++)
715 /* Run subnet-up scripts for our own subnets */
717 subnet_update(myself, NULL, true);
721 if(!do_detach && getenv("LISTEN_FDS")) {
725 listen_sockets = atoi(getenv("LISTEN_FDS"));
727 unsetenv("LISTEN_FDS");
730 if(listen_sockets > MAXSOCKETS) {
731 logger(LOG_ERR, "Too many listening sockets");
735 for(i = 0; i < listen_sockets; i++) {
737 if(getsockname(i + 3, &sa.sa, &salen) < 0) {
738 logger(LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
742 listen_socket[i].tcp = i + 3;
745 fcntl(i + 3, F_SETFD, FD_CLOEXEC);
748 listen_socket[i].udp = setup_vpn_in_socket(&sa);
749 if(listen_socket[i].udp < 0)
752 ifdebug(CONNECTIONS) {
753 hostname = sockaddr2hostname(&sa);
754 logger(LOG_NOTICE, "Listening on %s", hostname);
758 memcpy(&listen_socket[i].sa, &sa, salen);
762 cfg = lookup_config(config_tree, "BindToAddress");
765 get_config_string(cfg, &address);
767 cfg = lookup_config_next(config_tree, cfg);
772 char *space = strchr(address, ' ');
778 if(!strcmp(address, "*"))
782 hint.ai_family = addressfamily;
783 hint.ai_socktype = SOCK_STREAM;
784 hint.ai_protocol = IPPROTO_TCP;
785 hint.ai_flags = AI_PASSIVE;
787 err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
791 logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
796 for(aip = ai; aip; aip = aip->ai_next) {
797 if(listen_sockets >= MAXSOCKETS) {
798 logger(LOG_ERR, "Too many listening sockets");
802 listen_socket[listen_sockets].tcp =
803 setup_listen_socket((sockaddr_t *) aip->ai_addr);
805 if(listen_socket[listen_sockets].tcp < 0)
808 listen_socket[listen_sockets].udp =
809 setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
811 if(listen_socket[listen_sockets].udp < 0)
814 ifdebug(CONNECTIONS) {
815 hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
816 logger(LOG_NOTICE, "Listening on %s", hostname);
820 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
828 if(!listen_sockets) {
829 logger(LOG_ERR, "Unable to create any listening socket!");
833 /* If no Port option was specified, set myport to the port used by the first listening socket. */
835 if(!port_specified) {
837 socklen_t salen = sizeof sa;
838 if(!getsockname(listen_socket[0].udp, &sa.sa, &salen)) {
840 sockaddr2str(&sa, NULL, &myport);
842 myport = xstrdup("655");
848 logger(LOG_NOTICE, "Ready");
855 bool setup_network(void) {
865 if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
866 if(pinginterval < 1) {
867 pinginterval = 86400;
872 if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
874 if(pingtimeout < 1 || pingtimeout > pinginterval)
875 pingtimeout = pinginterval;
877 if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
878 maxoutbufsize = 10 * MTU;
887 close all open network connections
889 void close_network_connections(void) {
890 avl_node_t *node, *next;
892 char *envp[5] = {NULL};
895 for(node = connection_tree->head; node; node = next) {
899 terminate_connection(c, false);
902 for(list_node_t *node = outgoing_list->head; node; node = node->next) {
903 outgoing_t *outgoing = node->data;
906 event_del(outgoing->event);
909 list_delete_list(outgoing_list);
911 if(myself && myself->connection) {
912 subnet_update(myself, NULL, false);
913 terminate_connection(myself->connection, false);
914 free_connection(myself->connection);
917 for(i = 0; i < listen_sockets; i++) {
918 close(listen_socket[i].tcp);
919 close(listen_socket[i].udp);
922 xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
923 xasprintf(&envp[1], "DEVICE=%s", device ? : "");
924 xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
925 xasprintf(&envp[3], "NAME=%s", myself->name);
934 execute_script("tinc-down", envp);
936 if(myport) free(myport);
938 for(i = 0; i < 4; i++)