git.meshlink.io Git - meshlink/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         ifdebug(STATUS) logger(LOG_INFO, _("Regenerating symmetric key"));
 152
 153         if(!cipher_regenerate_key(&myself->cipher, true)) {
 154                 logger(LOG_ERR, _("Error regenerating key!"));
 155                 abort();
 156         }
 157
 158         if(timeout_initialized(&keyexpire_event)) {
 159                 event_del(&keyexpire_event);
 160                 send_key_changed(broadcast, myself);
 161         } else {
 162                 timeout_set(&keyexpire_event, keyexpire_handler, NULL);
 163         }
 164
 165         event_add(&keyexpire_event, &(struct timeval){keylifetime, 0});
 166 }
 167
 168 /*
 169   Configure node_t myself and set up the local sockets (listen only)
 170 */
 171 bool setup_myself(void) {
 172         config_t *cfg;
 173         subnet_t *subnet;
 174         char *name, *hostname, *mode, *afname, *cipher, *digest;
 175         char *address = NULL;
 176         char *envp[5];
 177         struct addrinfo *ai, *aip, hint = {0};
 178         bool choice;
 179         int i, err;
 180
 181         cp();
 182
 183         myself = new_node();
 184         myself->connection = new_connection();
 185         init_configuration(&myself->connection->config_tree);
 186
 187         asprintf(&myself->hostname, _("MYSELF"));
 188         asprintf(&myself->connection->hostname, _("MYSELF"));
 189
 190         myself->connection->options = 0;
 191         myself->connection->protocol_version = PROT_CURRENT;
 192
 193         if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {     /* Not acceptable */
 194                 logger(LOG_ERR, _("Name for tinc daemon required!"));
 195                 return false;
 196         }
 197
 198         if(!check_id(name)) {
 199                 logger(LOG_ERR, _("Invalid name for myself!"));
 200                 free(name);
 201                 return false;
 202         }
 203
 204         myself->name = name;
 205         myself->connection->name = xstrdup(name);
 206
 207         if(!read_connection_config(myself->connection)) {
 208                 logger(LOG_ERR, _("Cannot open host configuration file for myself!"));
 209                 return false;
 210         }
 211
 212         if(!read_rsa_private_key())
 213                 return false;
 214
 215         if(!get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myport))
 216                 asprintf(&myport, "655");
 217
 218         /* Read in all the subnets specified in the host configuration file */
 219
 220         cfg = lookup_config(myself->connection->config_tree, "Subnet");
 221
 222         while(cfg) {
 223                 if(!get_config_subnet(cfg, &subnet))
 224                         return false;
 225
 226                 subnet_add(myself, subnet);
 227
 228                 cfg = lookup_config_next(myself->connection->config_tree, cfg);
 229         }
 230
 231         /* Check some options */
 232
 233         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 234                 myself->options |= OPTION_INDIRECT;
 235
 236         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 237                 myself->options |= OPTION_TCPONLY;
 238
 239         if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice) && choice)
 240                 myself->options |= OPTION_INDIRECT;
 241
 242         if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice) && choice)
 243                 myself->options |= OPTION_TCPONLY;
 244
 245         if(myself->options & OPTION_TCPONLY)
 246                 myself->options |= OPTION_INDIRECT;
 247
 248         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 249
 250         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 251                 if(!strcasecmp(mode, "router"))
 252                         routing_mode = RMODE_ROUTER;
 253                 else if(!strcasecmp(mode, "switch"))
 254                         routing_mode = RMODE_SWITCH;
 255                 else if(!strcasecmp(mode, "hub"))
 256                         routing_mode = RMODE_HUB;
 257                 else {
 258                         logger(LOG_ERR, _("Invalid routing mode!"));
 259                         return false;
 260                 }
 261                 free(mode);
 262         } else
 263                 routing_mode = RMODE_ROUTER;
 264
 265         if(routing_mode == RMODE_ROUTER)
 266                 if(!get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) || choice)
 267                         myself->options |= OPTION_PMTU_DISCOVERY;
 268
 269         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 270
 271 #if !defined(SOL_IP) || !defined(IP_TOS)
 272         if(priorityinheritance)
 273                 logger(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
 274 #endif
 275
 276         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 277                 macexpire = 600;
 278
 279         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 280                 if(maxtimeout <= 0) {
 281                         logger(LOG_ERR, _("Bogus maximum timeout!"));
 282                         return false;
 283                 }
 284         } else
 285                 maxtimeout = 900;
 286
 287         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 288                 if(!strcasecmp(afname, "IPv4"))
 289                         addressfamily = AF_INET;
 290                 else if(!strcasecmp(afname, "IPv6"))
 291                         addressfamily = AF_INET6;
 292                 else if(!strcasecmp(afname, "any"))
 293                         addressfamily = AF_UNSPEC;
 294                 else {
 295                         logger(LOG_ERR, _("Invalid address family!"));
 296                         return false;
 297                 }
 298                 free(afname);
 299         }
 300
 301         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 302
 303         /* Generate packet encryption key */
 304
 305         if(!get_config_string(lookup_config(myself->connection->config_tree, "Cipher"), &cipher))
 306                 cipher = xstrdup("blowfish");
 307
 308         if(!cipher_open_by_name(&myself->cipher, cipher)) {
 309                 logger(LOG_ERR, _("Unrecognized cipher type!"));
 310                 return false;
 311         }
 312
 313         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 314                 keylifetime = 3600;
 315
 316         regenerate_key();
 317
 318         /* Check if we want to use message authentication codes... */
 319
 320         if(!get_config_string(lookup_config(myself->connection->config_tree, "Digest"), &digest))
 321                 digest = xstrdup("sha1");
 322
 323         if(!digest_open_by_name(&myself->digest, digest)) {
 324                 logger(LOG_ERR, _("Unrecognized digest type!"));
 325                 return false;
 326         }
 327
 328         if(!get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &myself->maclength))
 329
 330         if(digest_active(&myself->digest)) {
 331                 if(myself->maclength > digest_length(&myself->digest)) {
 332                         logger(LOG_ERR, _("MAC length exceeds size of digest!"));
 333                         return false;
 334                 } else if(myself->maclength < 0) {
 335                         logger(LOG_ERR, _("Bogus MAC length!"));
 336                         return false;
 337                 }
 338         }
 339
 340         /* Compression */
 341
 342         if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"), &myself->compression)) {
 343                 if(myself->compression < 0 || myself->compression > 11) {
 344                         logger(LOG_ERR, _("Bogus compression level!"));
 345                         return false;
 346                 }
 347         } else
 348                 myself->compression = 0;
 349
 350         myself->connection->outcompression = 0;
 351
 352         /* Done */
 353
 354         myself->nexthop = myself;
 355         myself->via = myself;
 356         myself->status.reachable = true;
 357         node_add(myself);
 358
 359         graph();
 360
 361         /* Open device */
 362
 363         if(!setup_device())
 364                 return false;
 365
 366         event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL);
 367
 368         if (event_add(&device_ev, NULL) < 0) {
 369                 logger(LOG_ERR, _("event_add failed: %s"), strerror(errno));
 370                 close_device();
 371                 return false;
 372         }
 373
 374         /* Run tinc-up script to further initialize the tap interface */
 375         asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 376         asprintf(&envp[1], "DEVICE=%s", device ? : "");
 377         asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 378         asprintf(&envp[3], "NAME=%s", myself->name);
 379         envp[4] = NULL;
 380
 381         execute_script("tinc-up", envp);
 382
 383         for(i = 0; i < 5; i++)
 384                 free(envp[i]);
 385
 386         /* Run subnet-up scripts for our own subnets */
 387
 388         subnet_update(myself, NULL, true);
 389
 390         /* Open sockets */
 391
 392         get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
 393
 394         hint.ai_family = addressfamily;
 395         hint.ai_socktype = SOCK_STREAM;
 396         hint.ai_protocol = IPPROTO_TCP;
 397         hint.ai_flags = AI_PASSIVE;
 398
 399         err = getaddrinfo(address, myport, &hint, &ai);
 400
 401         if(err || !ai) {
 402                 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
 403                            gai_strerror(err));
 404                 return false;
 405         }
 406
 407         listen_sockets = 0;
 408
 409         for(aip = ai; aip; aip = aip->ai_next) {
 410                 listen_socket[listen_sockets].tcp =
 411                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 412
 413                 if(listen_socket[listen_sockets].tcp < 0)
 414                         continue;
 415
 416                 listen_socket[listen_sockets].udp =
 417                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 418
 419                 if(listen_socket[listen_sockets].udp < 0) {
 420                         close(listen_socket[listen_sockets].tcp);
 421                         continue;
 422                 }
 423
 424                 event_set(&listen_socket[listen_sockets].ev_tcp,
 425                                   listen_socket[listen_sockets].tcp,
 426                                   EV_READ|EV_PERSIST,
 427                                   handle_new_meta_connection, NULL);
 428                 if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
 429                         logger(LOG_EMERG, _("event_add failed: %s"), strerror(errno));
 430                         abort();
 431                 }
 432
 433                 event_set(&listen_socket[listen_sockets].ev_udp,
 434                                   listen_socket[listen_sockets].udp,
 435                                   EV_READ|EV_PERSIST,
 436                                   handle_incoming_vpn_data, NULL);
 437                 if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
 438                         logger(LOG_EMERG, _("event_add failed: %s"), strerror(errno));
 439                         abort();
 440                 }
 441
 442                 ifdebug(CONNECTIONS) {
 443                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 444                         logger(LOG_NOTICE, _("Listening on %s"), hostname);
 445                         free(hostname);
 446                 }
 447
 448                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 449                 listen_sockets++;
 450
 451                 if(listen_sockets >= MAXSOCKETS) {
 452                         logger(LOG_WARNING, _("Maximum of %d listening sockets reached"), MAXSOCKETS);
 453                         break;
 454                 }
 455         }
 456
 457         freeaddrinfo(ai);
 458
 459         if(listen_sockets)
 460                 logger(LOG_NOTICE, _("Ready"));
 461         else {
 462                 logger(LOG_ERR, _("Unable to create any listening socket!"));
 463                 return false;
 464         }
 465
 466         return true;
 467 }
 468
 469 /*
 470   setup all initial network connections
 471 */
 472 bool setup_network_connections(void) {
 473         cp();
 474
 475         init_connections();
 476         init_subnets();
 477         init_nodes();
 478         init_edges();
 479         init_requests();
 480
 481         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 482                 if(pinginterval < 1) {
 483                         pinginterval = 86400;
 484                 }
 485         } else
 486                 pinginterval = 60;
 487
 488         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 489                 pingtimeout = 5;
 490         if(pingtimeout < 1 || pingtimeout > pinginterval)
 491                 pingtimeout = pinginterval;
 492
 493         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 494                 maxoutbufsize = 10 * MTU;
 495
 496         if(!setup_myself())
 497                 return false;
 498
 499         try_outgoing_connections();
 500
 501         return true;
 502 }
 503
 504 /*
 505   close all open network connections
 506 */
 507 void close_network_connections(void) {
 508         splay_node_t *node, *next;
 509         connection_t *c;
 510         char *envp[5];
 511         int i;
 512
 513         cp();
 514
 515         for(node = connection_tree->head; node; node = next) {
 516                 next = node->next;
 517                 c = node->data;
 518                 c->outgoing = false;
 519                 terminate_connection(c, false);
 520         }
 521
 522         list_delete_list(outgoing_list);
 523
 524         if(myself && myself->connection) {
 525                 subnet_update(myself, NULL, false);
 526                 terminate_connection(myself->connection, false);
 527                 free_connection(myself->connection);
 528         }
 529
 530         for(i = 0; i < listen_sockets; i++) {
 531                 event_del(&listen_socket[i].ev_tcp);
 532                 event_del(&listen_socket[i].ev_udp);
 533                 close(listen_socket[i].tcp);
 534                 close(listen_socket[i].udp);
 535         }
 536
 537         asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 538         asprintf(&envp[1], "DEVICE=%s", device ? : "");
 539         asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 540         asprintf(&envp[3], "NAME=%s", myself->name);
 541         envp[4] = NULL;
 542
 543         exit_requests();
 544         exit_edges();
 545         exit_subnets();
 546         exit_nodes();
 547         exit_connections();
 548
 549         execute_script("tinc-down", envp);
 550
 551         if(myport) free(myport);
 552
 553         for(i = 0; i < 4; i++)
 554                 free(envp[i]);
 555
 556         close_device();
 557
 558         return;
 559 }