tinc-vpn.org Git - tinc/blob - src/net_setup.c

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2009 Guus Sliepen <guus@tinc-vpn.org>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20     $Id$
  21 */
  22
  23 #include "system.h"
  24
  25 #include "splay_tree.h"
  26 #include "cipher.h"
  27 #include "conf.h"
  28 #include "connection.h"
  29 #include "control.h"
  30 #include "device.h"
  31 #include "digest.h"
  32 #include "graph.h"
  33 #include "logger.h"
  34 #include "net.h"
  35 #include "netutl.h"
  36 #include "process.h"
  37 #include "protocol.h"
  38 #include "route.h"
  39 #include "rsa.h"
  40 #include "subnet.h"
  41 #include "utils.h"
  42 #include "xalloc.h"
  43
  44 char *myport;
  45 static struct event device_ev;
  46
  47 bool read_rsa_public_key(connection_t *c) {
  48         FILE *fp;
  49         char *fname;
  50         char *n;
  51         bool result;
  52
  53         cp();
  54
  55         /* First, check for simple PublicKey statement */
  56
  57         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
  58                 result = rsa_set_hex_public_key(&c->rsa, n, "FFFF");
  59                 free(n);
  60                 return result;
  61         }
  62
  63         /* Else, check for PublicKeyFile statement and read it */
  64
  65         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
  66                 asprintf(&fname, "%s/hosts/%s", confbase, c->name);
  67
  68         fp = fopen(fname, "r");
  69
  70         if(!fp) {
  71                 logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
  72                            fname, strerror(errno));
  73                 free(fname);
  74                 return false;
  75         }
  76
  77         result = rsa_read_pem_public_key(&c->rsa, fp);
  78         fclose(fp);
  79
  80         if(!result)
  81                 logger(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"), fname, strerror(errno));
  82         free(fname);
  83         return result;
  84 }
  85
  86 bool read_rsa_private_key() {
  87         FILE *fp;
  88         char *fname;
  89         char *n, *d;
  90         bool result;
  91
  92         cp();
  93
  94         /* First, check for simple PrivateKey statement */
  95
  96         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
  97                 if(!get_config_string(lookup_config(myself->connection->config_tree, "PublicKey"), &n)) {
  98                         logger(LOG_ERR, _("PrivateKey used but no PublicKey found!"));
  99                         free(d);
 100                         return false;
 101                 }
 102                 result = rsa_set_hex_private_key(&myself->connection->rsa, n, "FFFF", d);
 103                 free(n);
 104                 free(d);
 105                 return true;
 106         }
 107
 108         /* Else, check for PrivateKeyFile statement and read it */
 109
 110         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 111                 asprintf(&fname, "%s/rsa_key.priv", confbase);
 112
 113         fp = fopen(fname, "r");
 114
 115         if(!fp) {
 116                 logger(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
 117                            fname, strerror(errno));
 118                 free(fname);
 119                 return false;
 120         }
 121
 122 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 123         struct stat s;
 124
 125         if(fstat(fileno(fp), &s)) {
 126                 logger(LOG_ERR, _("Could not stat RSA private key file `%s': %s'"), fname, strerror(errno));
 127                 free(fname);
 128                 return false;
 129         }
 130
 131         if(s.st_mode & ~0100700)
 132                 logger(LOG_WARNING, _("Warning: insecure file permissions for RSA private key file `%s'!"), fname);
 133 #endif
 134
 135         result = rsa_read_pem_private_key(&myself->connection->rsa, fp);
 136         fclose(fp);
 137
 138         if(!result)
 139                 logger(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"), fname, strerror(errno));
 140         free(fname);
 141         return result;
 142 }
 143
 144 static struct event keyexpire_event;
 145
 146 static void keyexpire_handler(int fd, short events, void *data) {
 147         regenerate_key();
 148 }
 149
 150 void regenerate_key() {
 151         if(timeout_initialized(&keyexpire_event)) {
 152                 ifdebug(STATUS) logger(LOG_INFO, _("Expiring symmetric keys"));
 153                 event_del(&keyexpire_event);
 154                 send_key_changed(broadcast, myself);
 155         } else {
 156                 timeout_set(&keyexpire_event, keyexpire_handler, NULL);
 157         }
 158
 159         event_add(&keyexpire_event, &(struct timeval){keylifetime, 0});
 160 }
 161
 162 /*
 163   Configure node_t myself and set up the local sockets (listen only)
 164 */
 165 bool setup_myself(void) {
 166         config_t *cfg;
 167         subnet_t *subnet;
 168         char *name, *hostname, *mode, *afname, *cipher, *digest;
 169         char *address = NULL;
 170         char *envp[5];
 171         struct addrinfo *ai, *aip, hint = {0};
 172         bool choice;
 173         int i, err;
 174
 175         cp();
 176
 177         myself = new_node();
 178         myself->connection = new_connection();
 179         init_configuration(&myself->connection->config_tree);
 180
 181         asprintf(&myself->hostname, _("MYSELF"));
 182         asprintf(&myself->connection->hostname, _("MYSELF"));
 183
 184         myself->connection->options = 0;
 185         myself->connection->protocol_version = PROT_CURRENT;
 186
 187         if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {     /* Not acceptable */
 188                 logger(LOG_ERR, _("Name for tinc daemon required!"));
 189                 return false;
 190         }
 191
 192         if(!check_id(name)) {
 193                 logger(LOG_ERR, _("Invalid name for myself!"));
 194                 free(name);
 195                 return false;
 196         }
 197
 198         myself->name = name;
 199         myself->connection->name = xstrdup(name);
 200
 201         if(!read_connection_config(myself->connection)) {
 202                 logger(LOG_ERR, _("Cannot open host configuration file for myself!"));
 203                 return false;
 204         }
 205
 206         if(!read_rsa_private_key())
 207                 return false;
 208
 209         if(!get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myport))
 210                 asprintf(&myport, "655");
 211
 212         /* Read in all the subnets specified in the host configuration file */
 213
 214         cfg = lookup_config(myself->connection->config_tree, "Subnet");
 215
 216         while(cfg) {
 217                 if(!get_config_subnet(cfg, &subnet))
 218                         return false;
 219
 220                 subnet_add(myself, subnet);
 221
 222                 cfg = lookup_config_next(myself->connection->config_tree, cfg);
 223         }
 224
 225         /* Check some options */
 226
 227         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 228                 myself->options |= OPTION_INDIRECT;
 229
 230         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 231                 myself->options |= OPTION_TCPONLY;
 232
 233         if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice) && choice)
 234                 myself->options |= OPTION_INDIRECT;
 235
 236         if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice) && choice)
 237                 myself->options |= OPTION_TCPONLY;
 238
 239         if(myself->options & OPTION_TCPONLY)
 240                 myself->options |= OPTION_INDIRECT;
 241
 242         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 243
 244         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 245                 if(!strcasecmp(mode, "router"))
 246                         routing_mode = RMODE_ROUTER;
 247                 else if(!strcasecmp(mode, "switch"))
 248                         routing_mode = RMODE_SWITCH;
 249                 else if(!strcasecmp(mode, "hub"))
 250                         routing_mode = RMODE_HUB;
 251                 else {
 252                         logger(LOG_ERR, _("Invalid routing mode!"));
 253                         return false;
 254                 }
 255                 free(mode);
 256         } else
 257                 routing_mode = RMODE_ROUTER;
 258
 259         if(routing_mode == RMODE_ROUTER)
 260                 if(!get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) || choice)
 261                         myself->options |= OPTION_PMTU_DISCOVERY;
 262
 263         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 264
 265 #if !defined(SOL_IP) || !defined(IP_TOS)
 266         if(priorityinheritance)
 267                 logger(LOG_WARNING, _("%s not supported on this platform"), "PriorityInheritance");
 268 #endif
 269
 270         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 271                 macexpire = 600;
 272
 273         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 274                 if(maxtimeout <= 0) {
 275                         logger(LOG_ERR, _("Bogus maximum timeout!"));
 276                         return false;
 277                 }
 278         } else
 279                 maxtimeout = 900;
 280
 281         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 282                 if(!strcasecmp(afname, "IPv4"))
 283                         addressfamily = AF_INET;
 284                 else if(!strcasecmp(afname, "IPv6"))
 285                         addressfamily = AF_INET6;
 286                 else if(!strcasecmp(afname, "any"))
 287                         addressfamily = AF_UNSPEC;
 288                 else {
 289                         logger(LOG_ERR, _("Invalid address family!"));
 290                         return false;
 291                 }
 292                 free(afname);
 293         }
 294
 295         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 296
 297         /* Generate packet encryption key */
 298
 299         if(!get_config_string(lookup_config(myself->connection->config_tree, "Cipher"), &cipher))
 300                 cipher = xstrdup("blowfish");
 301
 302         if(!cipher_open_by_name(&myself->incipher, cipher)) {
 303                 logger(LOG_ERR, _("Unrecognized cipher type!"));
 304                 return false;
 305         }
 306
 307         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 308                 keylifetime = 3600;
 309
 310         regenerate_key();
 311
 312         /* Check if we want to use message authentication codes... */
 313
 314         if(!get_config_string(lookup_config(myself->connection->config_tree, "Digest"), &digest))
 315                 digest = xstrdup("sha1");
 316
 317         if(!digest_open_by_name(&myself->indigest, digest)) {
 318                 logger(LOG_ERR, _("Unrecognized digest type!"));
 319                 return false;
 320         }
 321
 322         if(!get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &myself->inmaclength))
 323
 324         if(digest_active(&myself->indigest)) {
 325                 if(myself->inmaclength > digest_length(&myself->indigest)) {
 326                         logger(LOG_ERR, _("MAC length exceeds size of digest!"));
 327                         return false;
 328                 } else if(myself->inmaclength < 0) {
 329                         logger(LOG_ERR, _("Bogus MAC length!"));
 330                         return false;
 331                 }
 332         }
 333
 334         /* Compression */
 335
 336         if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"), &myself->incompression)) {
 337                 if(myself->incompression < 0 || myself->incompression > 11) {
 338                         logger(LOG_ERR, _("Bogus compression level!"));
 339                         return false;
 340                 }
 341         } else
 342                 myself->incompression = 0;
 343
 344         myself->connection->outcompression = 0;
 345
 346         /* Done */
 347
 348         myself->nexthop = myself;
 349         myself->via = myself;
 350         myself->status.reachable = true;
 351         node_add(myself);
 352
 353         graph();
 354
 355         /* Open device */
 356
 357         if(!setup_device())
 358                 return false;
 359
 360         event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL);
 361
 362         if (event_add(&device_ev, NULL) < 0) {
 363                 logger(LOG_ERR, _("event_add failed: %s"), strerror(errno));
 364                 close_device();
 365                 return false;
 366         }
 367
 368         /* Run tinc-up script to further initialize the tap interface */
 369         asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 370         asprintf(&envp[1], "DEVICE=%s", device ? : "");
 371         asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 372         asprintf(&envp[3], "NAME=%s", myself->name);
 373         envp[4] = NULL;
 374
 375         execute_script("tinc-up", envp);
 376
 377         for(i = 0; i < 5; i++)
 378                 free(envp[i]);
 379
 380         /* Run subnet-up scripts for our own subnets */
 381
 382         subnet_update(myself, NULL, true);
 383
 384         /* Open sockets */
 385
 386         get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
 387
 388         hint.ai_family = addressfamily;
 389         hint.ai_socktype = SOCK_STREAM;
 390         hint.ai_protocol = IPPROTO_TCP;
 391         hint.ai_flags = AI_PASSIVE;
 392
 393         err = getaddrinfo(address, myport, &hint, &ai);
 394
 395         if(err || !ai) {
 396                 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
 397                            gai_strerror(err));
 398                 return false;
 399         }
 400
 401         listen_sockets = 0;
 402
 403         for(aip = ai; aip; aip = aip->ai_next) {
 404                 listen_socket[listen_sockets].tcp =
 405                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 406
 407                 if(listen_socket[listen_sockets].tcp < 0)
 408                         continue;
 409
 410                 listen_socket[listen_sockets].udp =
 411                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 412
 413                 if(listen_socket[listen_sockets].udp < 0) {
 414                         close(listen_socket[listen_sockets].tcp);
 415                         continue;
 416                 }
 417
 418                 event_set(&listen_socket[listen_sockets].ev_tcp,
 419                                   listen_socket[listen_sockets].tcp,
 420                                   EV_READ|EV_PERSIST,
 421                                   handle_new_meta_connection, NULL);
 422                 if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
 423                         logger(LOG_EMERG, _("event_add failed: %s"), strerror(errno));
 424                         abort();
 425                 }
 426
 427                 event_set(&listen_socket[listen_sockets].ev_udp,
 428                                   listen_socket[listen_sockets].udp,
 429                                   EV_READ|EV_PERSIST,
 430                                   handle_incoming_vpn_data, NULL);
 431                 if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
 432                         logger(LOG_EMERG, _("event_add failed: %s"), strerror(errno));
 433                         abort();
 434                 }
 435
 436                 ifdebug(CONNECTIONS) {
 437                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 438                         logger(LOG_NOTICE, _("Listening on %s"), hostname);
 439                         free(hostname);
 440                 }
 441
 442                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 443                 listen_sockets++;
 444
 445                 if(listen_sockets >= MAXSOCKETS) {
 446                         logger(LOG_WARNING, _("Maximum of %d listening sockets reached"), MAXSOCKETS);
 447                         break;
 448                 }
 449         }
 450
 451         freeaddrinfo(ai);
 452
 453         if(listen_sockets)
 454                 logger(LOG_NOTICE, _("Ready"));
 455         else {
 456                 logger(LOG_ERR, _("Unable to create any listening socket!"));
 457                 return false;
 458         }
 459
 460         return true;
 461 }
 462
 463 /*
 464   initialize network
 465 */
 466 bool setup_network(void)
 467 {
 468         cp();
 469
 470         init_connections();
 471         init_subnets();
 472         init_nodes();
 473         init_edges();
 474         init_requests();
 475
 476         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 477                 if(pinginterval < 1) {
 478                         pinginterval = 86400;
 479                 }
 480         } else
 481                 pinginterval = 60;
 482
 483         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 484                 pingtimeout = 5;
 485         if(pingtimeout < 1 || pingtimeout > pinginterval)
 486                 pingtimeout = pinginterval;
 487
 488         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 489                 maxoutbufsize = 10 * MTU;
 490
 491         if(!setup_myself())
 492                 return false;
 493
 494         return true;
 495 }
 496
 497 /*
 498   close all open network connections
 499 */
 500 void close_network_connections(void) {
 501         splay_node_t *node, *next;
 502         connection_t *c;
 503         char *envp[5];
 504         int i;
 505
 506         cp();
 507
 508         for(node = connection_tree->head; node; node = next) {
 509                 next = node->next;
 510                 c = node->data;
 511                 c->outgoing = false;
 512                 terminate_connection(c, false);
 513         }
 514
 515         list_delete_list(outgoing_list);
 516
 517         if(myself && myself->connection) {
 518                 subnet_update(myself, NULL, false);
 519                 terminate_connection(myself->connection, false);
 520                 free_connection(myself->connection);
 521         }
 522
 523         for(i = 0; i < listen_sockets; i++) {
 524                 event_del(&listen_socket[i].ev_tcp);
 525                 event_del(&listen_socket[i].ev_udp);
 526                 close(listen_socket[i].tcp);
 527                 close(listen_socket[i].udp);
 528         }
 529
 530         asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 531         asprintf(&envp[1], "DEVICE=%s", device ? : "");
 532         asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 533         asprintf(&envp[3], "NAME=%s", myself->name);
 534         envp[4] = NULL;
 535
 536         exit_requests();
 537         exit_edges();
 538         exit_subnets();
 539         exit_nodes();
 540         exit_connections();
 541
 542         execute_script("tinc-down", envp);
 543
 544         if(myport) free(myport);
 545
 546         for(i = 0; i < 4; i++)
 547                 free(envp[i]);
 548
 549         close_device();
 550
 551         return;
 552 }