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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
   4                   2000-2002 Guus Sliepen <guus@sliepen.warande.net>
   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: net_setup.c,v 1.2 2002/04/09 15:26:00 zarq Exp $
  21 */
  22
  23 #include "config.h"
  24
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <netdb.h>
  28 #include <netinet/in.h>
  29 #ifdef HAVE_LINUX
  30  #include <netinet/ip.h>
  31  #include <netinet/tcp.h>
  32 #endif
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <signal.h>
  37 #include <sys/time.h>
  38 #include <sys/types.h>
  39 #include <syslog.h>
  40 #include <unistd.h>
  41 #include <sys/ioctl.h>
  42 /* SunOS really wants sys/socket.h BEFORE net/if.h,
  43    and FreeBSD wants these lines below the rest. */
  44 #include <arpa/inet.h>
  45 #include <sys/socket.h>
  46 #include <net/if.h>
  47
  48 #include <openssl/pem.h>
  49 #include <openssl/rsa.h>
  50 #include <openssl/rand.h>
  51
  52 #include <utils.h>
  53 #include <xalloc.h>
  54 #include <avl_tree.h>
  55 #include <list.h>
  56
  57 #include "conf.h"
  58 #include "connection.h"
  59 #include "meta.h"
  60 #include "net.h"
  61 #include "netutl.h"
  62 #include "process.h"
  63 #include "protocol.h"
  64 #include "subnet.h"
  65 #include "graph.h"
  66 #include "process.h"
  67 #include "route.h"
  68 #include "device.h"
  69 #include "event.h"
  70
  71 #include "system.h"
  72
  73 char *myport;
  74
  75 int read_rsa_public_key(connection_t *c)
  76 {
  77   FILE *fp;
  78   char *fname;
  79   char *key;
  80 cp
  81   if(!c->rsa_key)
  82     c->rsa_key = RSA_new();
  83
  84   /* First, check for simple PublicKey statement */
  85
  86   if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key))
  87     {
  88       BN_hex2bn(&c->rsa_key->n, key);
  89       BN_hex2bn(&c->rsa_key->e, "FFFF");
  90       free(key);
  91       return 0;
  92     }
  93
  94   /* Else, check for PublicKeyFile statement and read it */
  95
  96   if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
  97     {
  98       if(is_safe_path(fname))
  99         {
 100           if((fp = fopen(fname, "r")) == NULL)
 101             {
 102               syslog(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
 103                      fname, strerror(errno));
 104               free(fname);
 105               return -1;
 106             }
 107           free(fname);
 108           c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
 109           fclose(fp);
 110           if(!c->rsa_key)
 111             {
 112               syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"),
 113                      fname, strerror(errno));
 114               return -1;
 115             }
 116           return 0;
 117         }
 118       else
 119         {
 120           free(fname);
 121           return -1;
 122         }
 123     }
 124
 125   /* Else, check if a harnessed public key is in the config file */
 126
 127   asprintf(&fname, "%s/hosts/%s", confbase, c->name);
 128   if((fp = fopen(fname, "r")))
 129     {
 130       c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
 131       fclose(fp);
 132     }
 133
 134   free(fname);
 135
 136   if(c->rsa_key)
 137     return 0;
 138   else
 139     {
 140       syslog(LOG_ERR, _("No public key for %s specified!"), c->name);
 141       return -1;
 142     }
 143 }
 144
 145 int read_rsa_private_key(void)
 146 {
 147   FILE *fp;
 148   char *fname, *key;
 149 cp
 150   if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key))
 151     {
 152       myself->connection->rsa_key = RSA_new();
 153       BN_hex2bn(&myself->connection->rsa_key->d, key);
 154       BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
 155       free(key);
 156       return 0;
 157     }
 158
 159   if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 160     asprintf(&fname, "%s/rsa_key.priv", confbase);
 161
 162   if(is_safe_path(fname))
 163     {
 164       if((fp = fopen(fname, "r")) == NULL)
 165         {
 166           syslog(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
 167                  fname, strerror(errno));
 168           free(fname);
 169           return -1;
 170         }
 171       free(fname);
 172       myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
 173       fclose(fp);
 174       if(!myself->connection->rsa_key)
 175         {
 176           syslog(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"),
 177                  fname, strerror(errno));
 178           return -1;
 179         }
 180       return 0;
 181     }
 182
 183   free(fname);
 184   return -1;
 185 }
 186
 187 /*
 188   Configure node_t myself and set up the local sockets (listen only)
 189 */
 190 int setup_myself(void)
 191 {
 192   config_t *cfg;
 193   subnet_t *subnet;
 194   char *name, *hostname, *mode, *afname, *cipher, *digest;
 195   struct addrinfo hint, *ai, *aip;
 196   int choice, err;
 197 cp
 198   myself = new_node();
 199   myself->connection = new_connection();
 200   init_configuration(&myself->connection->config_tree);
 201
 202   asprintf(&myself->hostname, _("MYSELF"));
 203   asprintf(&myself->connection->hostname, _("MYSELF"));
 204
 205   myself->connection->options = 0;
 206   myself->connection->protocol_version = PROT_CURRENT;
 207
 208   if(!get_config_string(lookup_config(config_tree, "Name"), &name)) /* Not acceptable */
 209     {
 210       syslog(LOG_ERR, _("Name for tinc daemon required!"));
 211       return -1;
 212     }
 213
 214   if(check_id(name))
 215     {
 216       syslog(LOG_ERR, _("Invalid name for myself!"));
 217       free(name);
 218       return -1;
 219     }
 220
 221   myself->name = name;
 222   myself->connection->name = xstrdup(name);
 223
 224 cp
 225   if(read_rsa_private_key())
 226     return -1;
 227
 228   if(read_connection_config(myself->connection))
 229     {
 230       syslog(LOG_ERR, _("Cannot open host configuration file for myself!"));
 231       return -1;
 232     }
 233
 234   if(read_rsa_public_key(myself->connection))
 235     return -1;
 236 cp
 237
 238   if(!get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myport))
 239     asprintf(&myport, "655");
 240
 241 /* Read in all the subnets specified in the host configuration file */
 242
 243   cfg = lookup_config(myself->connection->config_tree, "Subnet");
 244
 245   while(cfg)
 246     {
 247       if(!get_config_subnet(cfg, &subnet))
 248         return -1;
 249
 250       subnet_add(myself, subnet);
 251
 252       cfg = lookup_config_next(myself->connection->config_tree, cfg);
 253     }
 254
 255 cp
 256   /* Check some options */
 257
 258   if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice))
 259     if(choice)
 260       myself->options |= OPTION_INDIRECT;
 261
 262   if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice))
 263     if(choice)
 264       myself->options |= OPTION_TCPONLY;
 265
 266   if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice))
 267     if(choice)
 268       myself->options |= OPTION_INDIRECT;
 269
 270   if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice))
 271     if(choice)
 272       myself->options |= OPTION_TCPONLY;
 273
 274   if(myself->options & OPTION_TCPONLY)
 275     myself->options |= OPTION_INDIRECT;
 276
 277   if(get_config_string(lookup_config(config_tree, "Mode"), &mode))
 278     {
 279       if(!strcasecmp(mode, "router"))
 280         routing_mode = RMODE_ROUTER;
 281       else if (!strcasecmp(mode, "switch"))
 282         routing_mode = RMODE_SWITCH;
 283       else if (!strcasecmp(mode, "hub"))
 284         routing_mode = RMODE_HUB;
 285       else
 286         {
 287           syslog(LOG_ERR, _("Invalid routing mode!"));
 288           return -1;
 289         }
 290       free(mode);
 291     }
 292   else
 293     routing_mode = RMODE_ROUTER;
 294
 295   get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 296 #if !defined(SOL_IP) || !defined(IP_TOS)
 297   if(priorityinheritance)
 298     syslog(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
 299 #endif
 300
 301   if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 302     macexpire= 600;
 303
 304   if(get_config_int(lookup_config(myself->connection->config_tree, "MaxTimeout"), &maxtimeout))
 305     {
 306       if(maxtimeout <= 0)
 307         {
 308           syslog(LOG_ERR, _("Bogus maximum timeout!"));
 309           return -1;
 310         }
 311     }
 312   else
 313     maxtimeout = 900;
 314
 315   if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname))
 316     {
 317       if(!strcasecmp(afname, "IPv4"))
 318         addressfamily = AF_INET;
 319       else if (!strcasecmp(afname, "IPv6"))
 320         addressfamily = AF_INET6;
 321       else if (!strcasecmp(afname, "any"))
 322         addressfamily = AF_UNSPEC;
 323       else
 324         {
 325           syslog(LOG_ERR, _("Invalid address family!"));
 326           return -1;
 327         }
 328       free(afname);
 329     }
 330   else
 331     addressfamily = AF_INET;
 332
 333   get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 334 cp
 335   /* Generate packet encryption key */
 336
 337   if(get_config_string(lookup_config(myself->connection->config_tree, "Cipher"), &cipher))
 338     {
 339       if(!strcasecmp(cipher, "none"))
 340         {
 341           myself->cipher = NULL;
 342         }
 343       else
 344         {
 345           if(!(myself->cipher = EVP_get_cipherbyname(cipher)))
 346             {
 347               syslog(LOG_ERR, _("Unrecognized cipher type!"));
 348               return -1;
 349             }
 350         }
 351     }
 352   else
 353     myself->cipher = EVP_bf_cbc();
 354
 355   if(myself->cipher)
 356     myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
 357   else
 358     myself->keylength = 1;
 359
 360   myself->connection->outcipher = EVP_bf_ofb();
 361
 362   myself->key = (char *)xmalloc(myself->keylength);
 363   RAND_pseudo_bytes(myself->key, myself->keylength);
 364
 365   if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 366     keylifetime = 3600;
 367
 368   keyexpires = now + keylifetime;
 369
 370   /* Check if we want to use message authentication codes... */
 371
 372   if(get_config_string(lookup_config(myself->connection->config_tree, "Digest"), &digest))
 373     {
 374       if(!strcasecmp(digest, "none"))
 375         {
 376           myself->digest = NULL;
 377         }
 378       else
 379         {
 380           if(!(myself->digest = EVP_get_digestbyname(digest)))
 381             {
 382               syslog(LOG_ERR, _("Unrecognized digest type!"));
 383               return -1;
 384             }
 385         }
 386     }
 387   else
 388     myself->digest = EVP_sha1();
 389
 390   myself->connection->outdigest = EVP_sha1();
 391
 392   if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &myself->maclength))
 393     {
 394       if(myself->digest)
 395         {
 396           if(myself->maclength > myself->digest->md_size)
 397             {
 398               syslog(LOG_ERR, _("MAC length exceeds size of digest!"));
 399               return -1;
 400             }
 401           else if (myself->maclength < 0)
 402             {
 403               syslog(LOG_ERR, _("Bogus MAC length!"));
 404               return -1;
 405             }
 406         }
 407     }
 408   else
 409     myself->maclength = 4;
 410
 411   myself->connection->outmaclength = 0;
 412
 413   /* Compression */
 414
 415   if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"), &myself->compression))
 416     {
 417       if(myself->compression < 0 || myself->compression > 9)
 418         {
 419           syslog(LOG_ERR, _("Bogus compression level!"));
 420           return -1;
 421         }
 422     }
 423   else
 424     myself->compression = 0;
 425
 426   myself->connection->outcompression = 0;
 427 cp
 428   /* Done */
 429
 430   myself->nexthop = myself;
 431   myself->via = myself;
 432   myself->status.active = 1;
 433   myself->status.reachable = 1;
 434   node_add(myself);
 435
 436   graph();
 437
 438 cp
 439   /* Open sockets */
 440
 441   memset(&hint, 0, sizeof(hint));
 442
 443   hint.ai_family = addressfamily;
 444   hint.ai_socktype = SOCK_STREAM;
 445   hint.ai_protocol = IPPROTO_TCP;
 446   hint.ai_flags = AI_PASSIVE;
 447
 448   if((err = getaddrinfo(NULL, myport, &hint, &ai)) || !ai)
 449     {
 450       syslog(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(err));
 451       return -1;
 452     }
 453
 454   for(aip = ai; aip; aip = aip->ai_next)
 455     {
 456       if((listen_socket[listen_sockets].tcp = setup_listen_socket((sockaddr_t *)aip->ai_addr)) < 0)
 457         continue;
 458
 459       if((listen_socket[listen_sockets].udp = setup_vpn_in_socket((sockaddr_t *)aip->ai_addr)) < 0)
 460         continue;
 461
 462       if(debug_lvl >= DEBUG_CONNECTIONS)
 463         {
 464           hostname = sockaddr2hostname((sockaddr_t *)aip->ai_addr);
 465           syslog(LOG_NOTICE, _("Listening on %s"), hostname);
 466           free(hostname);
 467         }
 468
 469       listen_socket[listen_sockets].sa.sa = *aip->ai_addr;
 470       listen_sockets++;
 471     }
 472
 473   freeaddrinfo(ai);
 474
 475   if(listen_sockets)
 476     syslog(LOG_NOTICE, _("Ready"));
 477   else
 478     {
 479       syslog(LOG_ERR, _("Unable to create any listening socket!"));
 480       return -1;
 481     }
 482 cp
 483   return 0;
 484 }
 485
 486 /*
 487   setup all initial network connections
 488 */
 489 int setup_network_connections(void)
 490 {
 491 cp
 492   now = time(NULL);
 493
 494   init_connections();
 495   init_subnets();
 496   init_nodes();
 497   init_edges();
 498   init_events();
 499   init_requests();
 500
 501   if(get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 502     {
 503       if(pingtimeout < 1)
 504         {
 505           pingtimeout = 86400;
 506         }
 507     }
 508   else
 509     pingtimeout = 60;
 510
 511   if(setup_device() < 0)
 512     return -1;
 513
 514   /* Run tinc-up script to further initialize the tap interface */
 515   execute_script("tinc-up");
 516
 517   if(setup_myself() < 0)
 518     return -1;
 519
 520   try_outgoing_connections();
 521 cp
 522   return 0;
 523 }
 524
 525 /*
 526   close all open network connections
 527 */
 528 void close_network_connections(void)
 529 {
 530   avl_node_t *node, *next;
 531   connection_t *c;
 532   int i;
 533 cp
 534   for(node = connection_tree->head; node; node = next)
 535     {
 536       next = node->next;
 537       c = (connection_t *)node->data;
 538       if(c->outgoing)
 539         free(c->outgoing->name), free(c->outgoing), c->outgoing = NULL;
 540       terminate_connection(c, 0);
 541     }
 542
 543   if(myself && myself->connection)
 544     terminate_connection(myself->connection, 0);
 545
 546   for(i = 0; i < listen_sockets; i++)
 547     {
 548       close(listen_socket[i].tcp);
 549       close(listen_socket[i].udp);
 550     }
 551
 552   exit_requests();
 553   exit_events();
 554   exit_edges();
 555   exit_subnets();
 556   exit_nodes();
 557   exit_connections();
 558
 559   execute_script("tinc-down");
 560
 561   close_device();
 562 cp
 563   return;
 564 }