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 1.1.2.15 2002/04/23 07:49:38 guus 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   char *address = NULL;
 196   struct addrinfo hint, *ai, *aip;
 197   int choice, err;
 198 cp
 199   myself = new_node();
 200   myself->connection = new_connection();
 201   init_configuration(&myself->connection->config_tree);
 202
 203   asprintf(&myself->hostname, _("MYSELF"));
 204   asprintf(&myself->connection->hostname, _("MYSELF"));
 205
 206   myself->connection->options = 0;
 207   myself->connection->protocol_version = PROT_CURRENT;
 208
 209   if(!get_config_string(lookup_config(config_tree, "Name"), &name)) /* Not acceptable */
 210     {
 211       syslog(LOG_ERR, _("Name for tinc daemon required!"));
 212       return -1;
 213     }
 214
 215   if(check_id(name))
 216     {
 217       syslog(LOG_ERR, _("Invalid name for myself!"));
 218       free(name);
 219       return -1;
 220     }
 221
 222   myself->name = name;
 223   myself->connection->name = xstrdup(name);
 224
 225 cp
 226   if(read_rsa_private_key())
 227     return -1;
 228
 229   if(read_connection_config(myself->connection))
 230     {
 231       syslog(LOG_ERR, _("Cannot open host configuration file for myself!"));
 232       return -1;
 233     }
 234
 235   if(read_rsa_public_key(myself->connection))
 236     return -1;
 237 cp
 238
 239   if(!get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myport))
 240     asprintf(&myport, "655");
 241
 242 /* Read in all the subnets specified in the host configuration file */
 243
 244   cfg = lookup_config(myself->connection->config_tree, "Subnet");
 245
 246   while(cfg)
 247     {
 248       if(!get_config_subnet(cfg, &subnet))
 249         return -1;
 250
 251       subnet_add(myself, subnet);
 252
 253       cfg = lookup_config_next(myself->connection->config_tree, cfg);
 254     }
 255
 256 cp
 257   /* Check some options */
 258
 259   if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice))
 260     if(choice)
 261       myself->options |= OPTION_INDIRECT;
 262
 263   if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice))
 264     if(choice)
 265       myself->options |= OPTION_TCPONLY;
 266
 267   if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice))
 268     if(choice)
 269       myself->options |= OPTION_INDIRECT;
 270
 271   if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice))
 272     if(choice)
 273       myself->options |= OPTION_TCPONLY;
 274
 275   if(myself->options & OPTION_TCPONLY)
 276     myself->options |= OPTION_INDIRECT;
 277
 278   if(get_config_string(lookup_config(config_tree, "Mode"), &mode))
 279     {
 280       if(!strcasecmp(mode, "router"))
 281         routing_mode = RMODE_ROUTER;
 282       else if (!strcasecmp(mode, "switch"))
 283         routing_mode = RMODE_SWITCH;
 284       else if (!strcasecmp(mode, "hub"))
 285         routing_mode = RMODE_HUB;
 286       else
 287         {
 288           syslog(LOG_ERR, _("Invalid routing mode!"));
 289           return -1;
 290         }
 291       free(mode);
 292     }
 293   else
 294     routing_mode = RMODE_ROUTER;
 295
 296   get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 297 #if !defined(SOL_IP) || !defined(IP_TOS)
 298   if(priorityinheritance)
 299     syslog(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
 300 #endif
 301
 302   if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 303     macexpire= 600;
 304
 305   if(get_config_int(lookup_config(myself->connection->config_tree, "MaxTimeout"), &maxtimeout))
 306     {
 307       if(maxtimeout <= 0)
 308         {
 309           syslog(LOG_ERR, _("Bogus maximum timeout!"));
 310           return -1;
 311         }
 312     }
 313   else
 314     maxtimeout = 900;
 315
 316   if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname))
 317     {
 318       if(!strcasecmp(afname, "IPv4"))
 319         addressfamily = AF_INET;
 320       else if (!strcasecmp(afname, "IPv6"))
 321         addressfamily = AF_INET6;
 322       else if (!strcasecmp(afname, "any"))
 323         addressfamily = AF_UNSPEC;
 324       else
 325         {
 326           syslog(LOG_ERR, _("Invalid address family!"));
 327           return -1;
 328         }
 329       free(afname);
 330     }
 331   else
 332     addressfamily = AF_INET;
 333
 334   get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 335 cp
 336   /* Generate packet encryption key */
 337
 338   if(get_config_string(lookup_config(myself->connection->config_tree, "Cipher"), &cipher))
 339     {
 340       if(!strcasecmp(cipher, "none"))
 341         {
 342           myself->cipher = NULL;
 343         }
 344       else
 345         {
 346           if(!(myself->cipher = EVP_get_cipherbyname(cipher)))
 347             {
 348               syslog(LOG_ERR, _("Unrecognized cipher type!"));
 349               return -1;
 350             }
 351         }
 352     }
 353   else
 354     myself->cipher = EVP_bf_cbc();
 355
 356   if(myself->cipher)
 357     myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
 358   else
 359     myself->keylength = 1;
 360
 361   myself->connection->outcipher = EVP_bf_ofb();
 362
 363   myself->key = (char *)xmalloc(myself->keylength);
 364   RAND_pseudo_bytes(myself->key, myself->keylength);
 365
 366   if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 367     keylifetime = 3600;
 368
 369   keyexpires = now + keylifetime;
 370
 371   /* Check if we want to use message authentication codes... */
 372
 373   if(get_config_string(lookup_config(myself->connection->config_tree, "Digest"), &digest))
 374     {
 375       if(!strcasecmp(digest, "none"))
 376         {
 377           myself->digest = NULL;
 378         }
 379       else
 380         {
 381           if(!(myself->digest = EVP_get_digestbyname(digest)))
 382             {
 383               syslog(LOG_ERR, _("Unrecognized digest type!"));
 384               return -1;
 385             }
 386         }
 387     }
 388   else
 389     myself->digest = EVP_sha1();
 390
 391   myself->connection->outdigest = EVP_sha1();
 392
 393   if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &myself->maclength))
 394     {
 395       if(myself->digest)
 396         {
 397           if(myself->maclength > myself->digest->md_size)
 398             {
 399               syslog(LOG_ERR, _("MAC length exceeds size of digest!"));
 400               return -1;
 401             }
 402           else if (myself->maclength < 0)
 403             {
 404               syslog(LOG_ERR, _("Bogus MAC length!"));
 405               return -1;
 406             }
 407         }
 408     }
 409   else
 410     myself->maclength = 4;
 411
 412   myself->connection->outmaclength = 0;
 413
 414   /* Compression */
 415
 416   if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"), &myself->compression))
 417     {
 418       if(myself->compression < 0 || myself->compression > 9)
 419         {
 420           syslog(LOG_ERR, _("Bogus compression level!"));
 421           return -1;
 422         }
 423     }
 424   else
 425     myself->compression = 0;
 426
 427   myself->connection->outcompression = 0;
 428 cp
 429   /* Done */
 430
 431   myself->nexthop = myself;
 432   myself->via = myself;
 433   myself->status.active = 1;
 434   myself->status.reachable = 1;
 435   node_add(myself);
 436
 437   graph();
 438
 439 cp
 440   /* Open sockets */
 441
 442   memset(&hint, 0, sizeof(hint));
 443
 444   get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
 445
 446   hint.ai_family = addressfamily;
 447   hint.ai_socktype = SOCK_STREAM;
 448   hint.ai_protocol = IPPROTO_TCP;
 449   hint.ai_flags = AI_PASSIVE;
 450
 451   if((err = getaddrinfo(address, myport, &hint, &ai)) || !ai)
 452     {
 453       syslog(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(err));
 454       return -1;
 455     }
 456
 457   for(aip = ai; aip; aip = aip->ai_next)
 458     {
 459       if((listen_socket[listen_sockets].tcp = setup_listen_socket((sockaddr_t *)aip->ai_addr)) < 0)
 460         continue;
 461
 462       if((listen_socket[listen_sockets].udp = setup_vpn_in_socket((sockaddr_t *)aip->ai_addr)) < 0)
 463         continue;
 464
 465       if(debug_lvl >= DEBUG_CONNECTIONS)
 466         {
 467           hostname = sockaddr2hostname((sockaddr_t *)aip->ai_addr);
 468           syslog(LOG_NOTICE, _("Listening on %s"), hostname);
 469           free(hostname);
 470         }
 471
 472       listen_socket[listen_sockets].sa.sa = *aip->ai_addr;
 473       listen_sockets++;
 474     }
 475
 476   freeaddrinfo(ai);
 477
 478   if(listen_sockets)
 479     syslog(LOG_NOTICE, _("Ready"));
 480   else
 481     {
 482       syslog(LOG_ERR, _("Unable to create any listening socket!"));
 483       return -1;
 484     }
 485 cp
 486   return 0;
 487 }
 488
 489 /*
 490   setup all initial network connections
 491 */
 492 int setup_network_connections(void)
 493 {
 494 cp
 495   now = time(NULL);
 496
 497   init_connections();
 498   init_subnets();
 499   init_nodes();
 500   init_edges();
 501   init_events();
 502   init_requests();
 503
 504   if(get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 505     {
 506       if(pingtimeout < 1)
 507         {
 508           pingtimeout = 86400;
 509         }
 510     }
 511   else
 512     pingtimeout = 60;
 513
 514   if(setup_device() < 0)
 515     return -1;
 516
 517   /* Run tinc-up script to further initialize the tap interface */
 518   execute_script("tinc-up");
 519
 520   if(setup_myself() < 0)
 521     return -1;
 522
 523   try_outgoing_connections();
 524 cp
 525   return 0;
 526 }
 527
 528 /*
 529   close all open network connections
 530 */
 531 void close_network_connections(void)
 532 {
 533   avl_node_t *node, *next;
 534   connection_t *c;
 535   int i;
 536 cp
 537   for(node = connection_tree->head; node; node = next)
 538     {
 539       next = node->next;
 540       c = (connection_t *)node->data;
 541       if(c->outgoing)
 542         free(c->outgoing->name), free(c->outgoing), c->outgoing = NULL;
 543       terminate_connection(c, 0);
 544     }
 545
 546   if(myself && myself->connection)
 547     terminate_connection(myself->connection, 0);
 548
 549   for(i = 0; i < listen_sockets; i++)
 550     {
 551       close(listen_socket[i].tcp);
 552       close(listen_socket[i].udp);
 553     }
 554
 555   exit_requests();
 556   exit_events();
 557   exit_edges();
 558   exit_subnets();
 559   exit_nodes();
 560   exit_connections();
 561
 562   execute_script("tinc-down");
 563
 564   close_device();
 565 cp
 566   return;
 567 }