3 Copyright (C) 1998-2005 Ivo Timmermans,
4 2000-2015 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"
51 bool read_rsa_public_key(connection_t *c) {
58 c->rsa_key = RSA_new();
59 // RSA_blinding_on(c->rsa_key, NULL);
62 /* First, check for simple PublicKey statement */
64 if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
65 if(BN_hex2bn(&c->rsa_key->n, key) != strlen(key)) {
66 logger(LOG_ERR, "Invalid PublicKey for %s!", c->name);
69 BN_hex2bn(&c->rsa_key->e, "FFFF");
74 /* Else, check for PublicKeyFile statement and read it */
76 if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &pubname)) {
77 fp = fopen(pubname, "r");
80 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", pubname, strerror(errno));
85 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
90 return true; /* Woohoo. */
93 /* If it fails, try PEM_read_RSA_PUBKEY. */
94 fp = fopen(pubname, "r");
97 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", pubname, strerror(errno));
102 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
106 // RSA_blinding_on(c->rsa_key, NULL);
111 logger(LOG_ERR, "Reading RSA public key file `%s' failed: %s", pubname, strerror(errno));
116 /* Else, check if a harnessed public key is in the config file */
118 xasprintf(&hcfname, "%s/hosts/%s", confbase, c->name);
119 fp = fopen(hcfname, "r");
122 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", hcfname, strerror(errno));
127 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
135 /* Try again with PEM_read_RSA_PUBKEY. */
137 fp = fopen(hcfname, "r");
140 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", hcfname, strerror(errno));
146 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
147 // RSA_blinding_on(c->rsa_key, NULL);
153 logger(LOG_ERR, "No public key for %s specified!", c->name);
158 static bool read_rsa_private_key(void) {
160 char *fname, *key, *pubkey;
162 if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
163 myself->connection->rsa_key = RSA_new();
164 // RSA_blinding_on(myself->connection->rsa_key, NULL);
165 if(BN_hex2bn(&myself->connection->rsa_key->d, key) != strlen(key)) {
166 logger(LOG_ERR, "Invalid PrivateKey for myself!");
171 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &pubkey)) {
172 logger(LOG_ERR, "PrivateKey used but no PublicKey found!");
175 if(BN_hex2bn(&myself->connection->rsa_key->n, pubkey) != strlen(pubkey)) {
176 logger(LOG_ERR, "Invalid PublicKey for myself!");
181 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
185 if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
186 xasprintf(&fname, "%s/rsa_key.priv", confbase);
188 fp = fopen(fname, "r");
191 logger(LOG_ERR, "Error reading RSA private key file `%s': %s",
192 fname, strerror(errno));
197 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
200 if(!fstat(fileno(fp), &s)) {
201 if(s.st_mode & ~0100700)
202 logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
204 logger(LOG_WARNING, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
208 myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
211 if(!myself->connection->rsa_key) {
212 logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s",
213 fname, strerror(errno));
223 Read Subnets from all host config files
225 void load_all_subnets(void) {
230 avl_tree_t *config_tree;
235 xasprintf(&dname, "%s/hosts", confbase);
236 dir = opendir(dname);
238 logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
243 while((ent = readdir(dir))) {
244 if(!check_id(ent->d_name))
247 n = lookup_node(ent->d_name);
248 #ifdef _DIRENT_HAVE_D_TYPE
249 //if(ent->d_type != DT_REG)
253 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
254 init_configuration(&config_tree);
255 read_config_options(config_tree, ent->d_name);
256 read_config_file(config_tree, fname);
261 n->name = xstrdup(ent->d_name);
265 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
266 if(!get_config_subnet(cfg, &s))
269 if((s2 = lookup_subnet(n, s))) {
276 exit_configuration(&config_tree);
282 char *get_name(void) {
285 get_config_string(lookup_config(config_tree, "Name"), &name);
291 char *envname = getenv(name + 1);
292 char hostname[32] = "";
294 if(strcmp(name + 1, "HOST")) {
295 fprintf(stderr, "Invalid Name: environment variable %s does not exist\n", name + 1);
299 if(gethostname(hostname, sizeof hostname) || !*hostname) {
300 fprintf(stderr, "Could not get hostname: %s\n", strerror(errno));
308 name = xstrdup(envname);
309 for(char *c = name; *c; c++)
314 if(!check_id(name)) {
315 logger(LOG_ERR, "Invalid name for myself!");
324 Configure node_t myself and set up the local sockets (listen only)
326 static bool setup_myself(void) {
329 char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
331 char *address = NULL;
334 char *envp[5] = {NULL};
335 struct addrinfo *ai, *aip, hint = {0};
339 bool port_specified = false;
342 myself->connection = new_connection();
344 myself->hostname = xstrdup("MYSELF");
345 myself->connection->hostname = xstrdup("MYSELF");
347 myself->connection->options = 0;
348 myself->connection->protocol_version = PROT_CURRENT;
350 if(!(name = get_name())) {
351 logger(LOG_ERR, "Name for tinc daemon required!");
355 /* Read tinc.conf and our own host config file */
358 myself->connection->name = xstrdup(name);
359 xasprintf(&fname, "%s/hosts/%s", confbase, name);
360 read_config_options(config_tree, name);
361 read_config_file(config_tree, fname);
364 if(!read_rsa_private_key())
367 if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
368 myport = xstrdup("655");
370 port_specified = true;
372 /* Ensure myport is numeric */
375 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
377 if(!ai || !ai->ai_addr)
380 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
381 sockaddr2str(&sa, NULL, &myport);
384 if(get_config_string(lookup_config(config_tree, "Proxy"), &proxy)) {
385 if((space = strchr(proxy, ' ')))
388 if(!strcasecmp(proxy, "none")) {
389 proxytype = PROXY_NONE;
390 } else if(!strcasecmp(proxy, "socks4")) {
391 proxytype = PROXY_SOCKS4;
392 } else if(!strcasecmp(proxy, "socks4a")) {
393 proxytype = PROXY_SOCKS4A;
394 } else if(!strcasecmp(proxy, "socks5")) {
395 proxytype = PROXY_SOCKS5;
396 } else if(!strcasecmp(proxy, "http")) {
397 proxytype = PROXY_HTTP;
398 } else if(!strcasecmp(proxy, "exec")) {
399 proxytype = PROXY_EXEC;
401 logger(LOG_ERR, "Unknown proxy type %s!", proxy);
412 if(!space || !*space) {
413 logger(LOG_ERR, "Argument expected for proxy type exec!");
417 proxyhost = xstrdup(space);
425 if(space && (space = strchr(space, ' ')))
426 *space++ = 0, proxyport = space;
427 if(space && (space = strchr(space, ' ')))
428 *space++ = 0, proxyuser = space;
429 if(space && (space = strchr(space, ' ')))
430 *space++ = 0, proxypass = space;
431 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
432 logger(LOG_ERR, "Host and port argument expected for proxy!");
436 proxyhost = xstrdup(proxyhost);
437 proxyport = xstrdup(proxyport);
438 if(proxyuser && *proxyuser)
439 proxyuser = xstrdup(proxyuser);
440 if(proxypass && *proxypass)
441 proxypass = xstrdup(proxypass);
448 /* Read in all the subnets specified in the host configuration file */
450 cfg = lookup_config(config_tree, "Subnet");
453 if(!get_config_subnet(cfg, &subnet))
456 subnet_add(myself, subnet);
458 cfg = lookup_config_next(config_tree, cfg);
461 /* Check some options */
463 if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
464 myself->options |= OPTION_INDIRECT;
466 if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
467 myself->options |= OPTION_TCPONLY;
469 if(myself->options & OPTION_TCPONLY)
470 myself->options |= OPTION_INDIRECT;
472 get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
473 get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
474 get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
475 get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
476 strictsubnets |= tunnelserver;
478 if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
479 if(!strcasecmp(mode, "router"))
480 routing_mode = RMODE_ROUTER;
481 else if(!strcasecmp(mode, "switch"))
482 routing_mode = RMODE_SWITCH;
483 else if(!strcasecmp(mode, "hub"))
484 routing_mode = RMODE_HUB;
486 logger(LOG_ERR, "Invalid routing mode!");
493 if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
494 if(!strcasecmp(mode, "off"))
495 forwarding_mode = FMODE_OFF;
496 else if(!strcasecmp(mode, "internal"))
497 forwarding_mode = FMODE_INTERNAL;
498 else if(!strcasecmp(mode, "kernel"))
499 forwarding_mode = FMODE_KERNEL;
501 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!");
535 #if !defined(SOL_IP) || !defined(IP_TOS)
536 if(priorityinheritance)
537 logger(LOG_WARNING, "%s not supported on this platform for IPv4 connection", "PriorityInheritance");
540 #if !defined(IPPROTO_IPV6) || !defined(IPV6_TCLASS)
541 if(priorityinheritance)
542 logger(LOG_WARNING, "%s not supported on this platform for IPv6 connection", "PriorityInheritance");
545 if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
548 if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
549 if(maxtimeout <= 0) {
550 logger(LOG_ERR, "Bogus maximum timeout!");
556 if(get_config_int(lookup_config(config_tree, "MinTimeout"), &mintimeout)) {
558 logger(LOG_ERR, "Bogus minimum timeout!");
561 if(mintimeout > maxtimeout) {
562 logger(LOG_WARNING, "Minimum timeout (%d s) cannot be larger than maximum timeout (%d s). Correcting !", mintimeout, maxtimeout );
563 mintimeout=maxtimeout;
568 if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
569 if(udp_rcvbuf <= 0) {
570 logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
575 if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
576 if(udp_sndbuf <= 0) {
577 logger(LOG_ERR, "UDPSndBuf cannot be negative!");
582 if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
583 if(replaywin_int < 0) {
584 logger(LOG_ERR, "ReplayWindow cannot be negative!");
587 replaywin = (unsigned)replaywin_int;
590 if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
591 if(!strcasecmp(afname, "IPv4"))
592 addressfamily = AF_INET;
593 else if(!strcasecmp(afname, "IPv6"))
594 addressfamily = AF_INET6;
595 else if(!strcasecmp(afname, "any"))
596 addressfamily = AF_UNSPEC;
598 logger(LOG_ERR, "Invalid address family!");
605 get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
607 /* Generate packet encryption key */
609 if(get_config_string(lookup_config(config_tree, "Cipher"), &cipher)) {
610 if(!strcasecmp(cipher, "none")) {
611 myself->incipher = NULL;
613 myself->incipher = EVP_get_cipherbyname(cipher);
615 if(!myself->incipher) {
616 logger(LOG_ERR, "Unrecognized cipher type!");
623 myself->incipher = EVP_bf_cbc();
626 myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len;
628 myself->inkeylength = 1;
630 myself->connection->outcipher = EVP_bf_ofb();
632 if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
635 keyexpires = now + keylifetime;
637 /* Check if we want to use message authentication codes... */
639 if(get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
640 if(!strcasecmp(digest, "none")) {
641 myself->indigest = NULL;
643 myself->indigest = EVP_get_digestbyname(digest);
645 if(!myself->indigest) {
646 logger(LOG_ERR, "Unrecognized digest type!");
654 myself->indigest = EVP_sha1();
656 myself->connection->outdigest = EVP_sha1();
658 if(get_config_int(lookup_config(config_tree, "MACLength"), &myself->inmaclength)) {
659 if(myself->indigest) {
660 if(myself->inmaclength > myself->indigest->md_size) {
661 logger(LOG_ERR, "MAC length exceeds size of digest!");
663 } else if(myself->inmaclength < 0) {
664 logger(LOG_ERR, "Bogus MAC length!");
669 myself->inmaclength = 4;
671 myself->connection->outmaclength = 0;
675 if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
676 if(myself->incompression < 0 || myself->incompression > 11) {
677 logger(LOG_ERR, "Bogus compression level!");
681 myself->incompression = 0;
683 myself->connection->outcompression = 0;
687 myself->nexthop = myself;
688 myself->via = myself;
689 myself->status.reachable = true;
701 if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
702 if(!strcasecmp(type, "dummy"))
703 devops = dummy_devops;
704 else if(!strcasecmp(type, "raw_socket"))
705 devops = raw_socket_devops;
706 else if(!strcasecmp(type, "multicast"))
707 devops = multicast_devops;
709 else if(!strcasecmp(type, "uml"))
713 else if(!strcasecmp(type, "vde"))
722 /* Run tinc-up script to further initialize the tap interface */
723 xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
724 xasprintf(&envp[1], "DEVICE=%s", device ? : "");
725 xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
726 xasprintf(&envp[3], "NAME=%s", myself->name);
734 execute_script("tinc-up", envp);
736 for(i = 0; i < 4; i++)
739 /* Run subnet-up scripts for our own subnets */
741 subnet_update(myself, NULL, true);
745 if(!do_detach && getenv("LISTEN_FDS")) {
749 listen_sockets = atoi(getenv("LISTEN_FDS"));
751 unsetenv("LISTEN_FDS");
754 if(listen_sockets > MAXSOCKETS) {
755 logger(LOG_ERR, "Too many listening sockets");
759 for(i = 0; i < listen_sockets; i++) {
761 if(getsockname(i + 3, &sa.sa, &salen) < 0) {
762 logger(LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
766 listen_socket[i].tcp = i + 3;
769 fcntl(i + 3, F_SETFD, FD_CLOEXEC);
772 listen_socket[i].udp = setup_vpn_in_socket(&sa);
773 if(listen_socket[i].udp < 0)
776 ifdebug(CONNECTIONS) {
777 hostname = sockaddr2hostname(&sa);
778 logger(LOG_NOTICE, "Listening on %s", hostname);
782 memcpy(&listen_socket[i].sa, &sa, salen);
786 cfg = lookup_config(config_tree, "BindToAddress");
789 get_config_string(cfg, &address);
791 cfg = lookup_config_next(config_tree, cfg);
796 char *space = strchr(address, ' ');
802 if(!strcmp(address, "*"))
806 hint.ai_family = addressfamily;
807 hint.ai_socktype = SOCK_STREAM;
808 hint.ai_protocol = IPPROTO_TCP;
809 hint.ai_flags = AI_PASSIVE;
811 #if HAVE_DECL_RES_INIT
812 // ensure glibc reloads /etc/resolv.conf.
815 err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
819 logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
824 for(aip = ai; aip; aip = aip->ai_next) {
825 if(listen_sockets >= MAXSOCKETS) {
826 logger(LOG_ERR, "Too many listening sockets");
830 listen_socket[listen_sockets].tcp =
831 setup_listen_socket((sockaddr_t *) aip->ai_addr);
833 if(listen_socket[listen_sockets].tcp < 0)
836 listen_socket[listen_sockets].udp =
837 setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
839 if(listen_socket[listen_sockets].udp < 0)
842 ifdebug(CONNECTIONS) {
843 hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
844 logger(LOG_NOTICE, "Listening on %s", hostname);
848 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
856 if(!listen_sockets) {
857 logger(LOG_ERR, "Unable to create any listening socket!");
861 /* If no Port option was specified, set myport to the port used by the first listening socket. */
863 if(!port_specified) {
865 socklen_t salen = sizeof sa;
866 if(!getsockname(listen_socket[0].udp, &sa.sa, &salen)) {
868 sockaddr2str(&sa, NULL, &myport);
870 myport = xstrdup("655");
876 logger(LOG_NOTICE, "Ready");
883 bool setup_network(void) {
893 if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
894 if(pinginterval < 1) {
895 pinginterval = 86400;
900 if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
902 if(pingtimeout < 1 || pingtimeout > pinginterval)
903 pingtimeout = pinginterval;
905 if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
906 maxoutbufsize = 10 * MTU;
915 close all open network connections
917 void close_network_connections(void) {
918 avl_node_t *node, *next;
920 char *envp[5] = {NULL};
923 for(node = connection_tree->head; node; node = next) {
927 terminate_connection(c, false);
930 for(list_node_t *node = outgoing_list->head; node; node = node->next) {
931 outgoing_t *outgoing = node->data;
934 event_del(outgoing->event);
937 list_delete_list(outgoing_list);
939 if(myself && myself->connection) {
940 subnet_update(myself, NULL, false);
941 terminate_connection(myself->connection, false);
942 free_connection(myself->connection);
945 for(i = 0; i < listen_sockets; i++) {
946 close(listen_socket[i].tcp);
947 close(listen_socket[i].udp);
950 xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
951 xasprintf(&envp[1], "DEVICE=%s", device ? : "");
952 xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
953 xasprintf(&envp[3], "NAME=%s", myself->name);
962 execute_script("tinc-down", envp);
964 if(myport) free(myport);
966 for(i = 0; i < 4; i++)