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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2003 Ivo Timmermans <ivo@o2w.nl>,
   4                   2000-2003 Guus Sliepen <guus@sliepen.eu.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: net_setup.c,v 1.1.2.42 2003/08/08 22:11:54 guus Exp $
  21 */
  22
  23 #include "system.h"
  24
  25 #include <openssl/pem.h>
  26 #include <openssl/rsa.h>
  27 #include <openssl/rand.h>
  28
  29 #include "avl_tree.h"
  30 #include "conf.h"
  31 #include "connection.h"
  32 #include "device.h"
  33 #include "event.h"
  34 #include "graph.h"
  35 #include "logger.h"
  36 #include "net.h"
  37 #include "netutl.h"
  38 #include "process.h"
  39 #include "protocol.h"
  40 #include "route.h"
  41 #include "subnet.h"
  42 #include "utils.h"
  43 #include "xalloc.h"
  44
  45 char *myport;
  46
  47 bool read_rsa_public_key(connection_t *c)
  48 {
  49         FILE *fp;
  50         char *fname;
  51         char *key;
  52
  53         cp();
  54
  55         if(!c->rsa_key) {
  56                 c->rsa_key = RSA_new();
  57 //              RSA_blinding_on(c->rsa_key, NULL);
  58         }
  59
  60         /* First, check for simple PublicKey statement */
  61
  62         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
  63                 BN_hex2bn(&c->rsa_key->n, key);
  64                 BN_hex2bn(&c->rsa_key->e, "FFFF");
  65                 free(key);
  66                 return true;
  67         }
  68
  69         /* Else, check for PublicKeyFile statement and read it */
  70
  71         if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
  72                 fp = fopen(fname, "r");
  73
  74                 if(!fp) {
  75                         logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
  76                                    fname, strerror(errno));
  77                         free(fname);
  78                         return false;
  79                 }
  80
  81                 free(fname);
  82                 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
  83                 fclose(fp);
  84
  85                 if(c->rsa_key)
  86                         return true;            /* Woohoo. */
  87
  88                 /* If it fails, try PEM_read_RSA_PUBKEY. */
  89                 fp = fopen(fname, "r");
  90
  91                 if(!fp) {
  92                         logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
  93                                    fname, strerror(errno));
  94                         free(fname);
  95                         return false;
  96                 }
  97
  98                 free(fname);
  99                 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
 100                 fclose(fp);
 101
 102                 if(c->rsa_key) {
 103 //                              RSA_blinding_on(c->rsa_key, NULL);
 104                         return true;
 105                 }
 106
 107                 logger(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"),
 108                            fname, strerror(errno));
 109                 return false;
 110         }
 111
 112         /* Else, check if a harnessed public key is in the config file */
 113
 114         asprintf(&fname, "%s/hosts/%s", confbase, c->name);
 115         fp = fopen(fname, "r");
 116
 117         if(fp) {
 118                 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
 119                 fclose(fp);
 120         }
 121
 122         free(fname);
 123
 124         if(c->rsa_key)
 125                 return true;
 126
 127         /* Try again with PEM_read_RSA_PUBKEY. */
 128
 129         asprintf(&fname, "%s/hosts/%s", confbase, c->name);
 130         fp = fopen(fname, "r");
 131
 132         if(fp) {
 133                 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
 134 //              RSA_blinding_on(c->rsa_key, NULL);
 135                 fclose(fp);
 136         }
 137
 138         free(fname);
 139
 140         if(c->rsa_key)
 141                 return true;
 142
 143         logger(LOG_ERR, _("No public key for %s specified!"), c->name);
 144
 145         return false;
 146 }
 147
 148 bool read_rsa_private_key(void)
 149 {
 150         FILE *fp;
 151         char *fname, *key;
 152         struct stat s;
 153
 154         cp();
 155
 156         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
 157                 myself->connection->rsa_key = RSA_new();
 158 //              RSA_blinding_on(myself->connection->rsa_key, NULL);
 159                 BN_hex2bn(&myself->connection->rsa_key->d, key);
 160                 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
 161                 free(key);
 162                 return true;
 163         }
 164
 165         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 166                 asprintf(&fname, "%s/rsa_key.priv", confbase);
 167
 168         fp = fopen(fname, "r");
 169
 170         if(!fp) {
 171                 logger(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
 172                            fname, strerror(errno));
 173                 free(fname);
 174                 return false;
 175         }
 176
 177 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 178         if(fstat(fileno(fp), &s)) {
 179                 logger(LOG_ERR, _("Could not stat RSA private key file `%s': %s'"),
 180                                 fname, strerror(errno));
 181                 free(fname);
 182                 return false;
 183         }
 184
 185         if(s.st_mode & ~0700)
 186                 logger(LOG_WARNING, _("Warning: insecure file permissions for RSA private key file `%s'!"), fname);
 187 #endif
 188
 189         myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
 190         fclose(fp);
 191
 192         if(!myself->connection->rsa_key) {
 193                 logger(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"),
 194                            fname, strerror(errno));
 195                 free(fname);
 196                 return false;
 197         }
 198
 199         free(fname);
 200         return true;
 201 }
 202
 203 /*
 204   Configure node_t myself and set up the local sockets (listen only)
 205 */
 206 bool setup_myself(void)
 207 {
 208         config_t *cfg;
 209         subnet_t *subnet;
 210         char *name, *hostname, *mode, *afname, *cipher, *digest;
 211         char *address = NULL;
 212         char *envp[5];
 213         struct addrinfo *ai, *aip, hint = {0};
 214         bool choice;
 215         int i, err;
 216
 217         cp();
 218
 219         myself = new_node();
 220         myself->connection = new_connection();
 221         init_configuration(&myself->connection->config_tree);
 222
 223         asprintf(&myself->hostname, _("MYSELF"));
 224         asprintf(&myself->connection->hostname, _("MYSELF"));
 225
 226         myself->connection->options = 0;
 227         myself->connection->protocol_version = PROT_CURRENT;
 228
 229         if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {     /* Not acceptable */
 230                 logger(LOG_ERR, _("Name for tinc daemon required!"));
 231                 return false;
 232         }
 233
 234         if(!check_id(name)) {
 235                 logger(LOG_ERR, _("Invalid name for myself!"));
 236                 free(name);
 237                 return false;
 238         }
 239
 240         myself->name = name;
 241         myself->connection->name = xstrdup(name);
 242
 243         if(!read_rsa_private_key())
 244                 return false;
 245
 246         if(!read_connection_config(myself->connection)) {
 247                 logger(LOG_ERR, _("Cannot open host configuration file for myself!"));
 248                 return false;
 249         }
 250
 251         if(!read_rsa_public_key(myself->connection))
 252                 return false;
 253
 254         if(!get_config_string
 255            (lookup_config(myself->connection->config_tree, "Port"), &myport))
 256                 asprintf(&myport, "655");
 257
 258         /* Read in all the subnets specified in the host configuration file */
 259
 260         cfg = lookup_config(myself->connection->config_tree, "Subnet");
 261
 262         while(cfg) {
 263                 if(!get_config_subnet(cfg, &subnet))
 264                         return false;
 265
 266                 subnet_add(myself, subnet);
 267
 268                 cfg = lookup_config_next(myself->connection->config_tree, cfg);
 269         }
 270
 271         /* Check some options */
 272
 273         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice))
 274                 if(choice)
 275                         myself->options |= OPTION_INDIRECT;
 276
 277         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice))
 278                 if(choice)
 279                         myself->options |= OPTION_TCPONLY;
 280
 281         if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice))
 282                 if(choice)
 283                         myself->options |= OPTION_INDIRECT;
 284
 285         if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice))
 286                 if(choice)
 287                         myself->options |= OPTION_TCPONLY;
 288
 289         if(myself->options & OPTION_TCPONLY)
 290                 myself->options |= OPTION_INDIRECT;
 291
 292         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 293                 if(!strcasecmp(mode, "router"))
 294                         routing_mode = RMODE_ROUTER;
 295                 else if(!strcasecmp(mode, "switch"))
 296                         routing_mode = RMODE_SWITCH;
 297                 else if(!strcasecmp(mode, "hub"))
 298                         routing_mode = RMODE_HUB;
 299                 else {
 300                         logger(LOG_ERR, _("Invalid routing mode!"));
 301                         return false;
 302                 }
 303                 free(mode);
 304         } else
 305                 routing_mode = RMODE_ROUTER;
 306
 307         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 308
 309 #if !defined(SOL_IP) || !defined(IP_TOS)
 310         if(priorityinheritance)
 311                 logger(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
 312 #endif
 313
 314         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 315                 macexpire = 600;
 316
 317         if(get_config_int(lookup_config(myself->connection->config_tree, "MaxTimeout"), &maxtimeout)) {
 318                 if(maxtimeout <= 0) {
 319                         logger(LOG_ERR, _("Bogus maximum timeout!"));
 320                         return false;
 321                 }
 322         } else
 323                 maxtimeout = 900;
 324
 325         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 326                 if(!strcasecmp(afname, "IPv4"))
 327                         addressfamily = AF_INET;
 328                 else if(!strcasecmp(afname, "IPv6"))
 329                         addressfamily = AF_INET6;
 330                 else if(!strcasecmp(afname, "any"))
 331                         addressfamily = AF_UNSPEC;
 332                 else {
 333                         logger(LOG_ERR, _("Invalid address family!"));
 334                         return false;
 335                 }
 336                 free(afname);
 337         }
 338
 339         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 340
 341         /* Generate packet encryption key */
 342
 343         if(get_config_string
 344            (lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) {
 345                 if(!strcasecmp(cipher, "none")) {
 346                         myself->cipher = NULL;
 347                 } else {
 348                         myself->cipher = EVP_get_cipherbyname(cipher);
 349
 350                         if(!myself->cipher) {
 351                                 logger(LOG_ERR, _("Unrecognized cipher type!"));
 352                                 return false;
 353                         }
 354                 }
 355         } else
 356                 myself->cipher = EVP_bf_cbc();
 357
 358         if(myself->cipher)
 359                 myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
 360         else
 361                 myself->keylength = 1;
 362
 363         myself->connection->outcipher = EVP_bf_ofb();
 364
 365         myself->key = (char *) xmalloc(myself->keylength);
 366         RAND_pseudo_bytes(myself->key, myself->keylength);
 367
 368         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 369                 keylifetime = 3600;
 370
 371         keyexpires = now + keylifetime;
 372
 373         if(myself->cipher) {
 374                 EVP_CIPHER_CTX_init(&packet_ctx);
 375                 EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, myself->key, myself->key + myself->cipher->key_len);
 376         }
 377
 378         /* Check if we want to use message authentication codes... */
 379
 380         if(get_config_string
 381            (lookup_config(myself->connection->config_tree, "Digest"), &digest)) {
 382                 if(!strcasecmp(digest, "none")) {
 383                         myself->digest = NULL;
 384                 } else {
 385                         myself->digest = EVP_get_digestbyname(digest);
 386
 387                         if(!myself->digest) {
 388                                 logger(LOG_ERR, _("Unrecognized digest type!"));
 389                                 return false;
 390                         }
 391                 }
 392         } else
 393                 myself->digest = EVP_sha1();
 394
 395         myself->connection->outdigest = EVP_sha1();
 396
 397         if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"),
 398                 &myself->maclength)) {
 399                 if(myself->digest) {
 400                         if(myself->maclength > myself->digest->md_size) {
 401                                 logger(LOG_ERR, _("MAC length exceeds size of digest!"));
 402                                 return false;
 403                         } else if(myself->maclength < 0) {
 404                                 logger(LOG_ERR, _("Bogus MAC length!"));
 405                                 return false;
 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"),
 416                 &myself->compression)) {
 417                 if(myself->compression < 0 || myself->compression > 11) {
 418                         logger(LOG_ERR, _("Bogus compression level!"));
 419                         return false;
 420                 }
 421         } else
 422                 myself->compression = 0;
 423
 424         myself->connection->outcompression = 0;
 425
 426         /* Done */
 427
 428         myself->nexthop = myself;
 429         myself->via = myself;
 430         myself->status.active = true;
 431         myself->status.reachable = true;
 432         node_add(myself);
 433
 434         graph();
 435
 436         /* Open device */
 437
 438         if(!setup_device())
 439                 return false;
 440
 441         /* Run tinc-up script to further initialize the tap interface */
 442         asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 443         asprintf(&envp[1], "DEVICE=%s", device ? : "");
 444         asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 445         asprintf(&envp[3], "NAME=%s", myself->name);
 446         envp[4] = NULL;
 447
 448         execute_script("tinc-up", envp);
 449
 450         for(i = 0; i < 5; i++)
 451                 free(envp[i]);
 452
 453         /* Open sockets */
 454
 455         get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
 456
 457         hint.ai_family = addressfamily;
 458         hint.ai_socktype = SOCK_STREAM;
 459         hint.ai_protocol = IPPROTO_TCP;
 460         hint.ai_flags = AI_PASSIVE;
 461
 462         err = getaddrinfo(address, myport, &hint, &ai);
 463
 464         if(err || !ai) {
 465                 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
 466                            gai_strerror(err));
 467                 return false;
 468         }
 469
 470         listen_sockets = 0;
 471
 472         for(aip = ai; aip; aip = aip->ai_next) {
 473                 listen_socket[listen_sockets].tcp =
 474                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 475
 476                 if(listen_socket[listen_sockets].tcp < 0)
 477                         continue;
 478
 479                 listen_socket[listen_sockets].udp =
 480                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 481
 482                 if(listen_socket[listen_sockets].udp < 0)
 483                         continue;
 484
 485                 ifdebug(CONNECTIONS) {
 486                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 487                         logger(LOG_NOTICE, _("Listening on %s"), hostname);
 488                         free(hostname);
 489                 }
 490
 491                 listen_socket[listen_sockets].sa.sa = *aip->ai_addr;
 492                 listen_sockets++;
 493         }
 494
 495         freeaddrinfo(ai);
 496
 497         if(listen_sockets)
 498                 logger(LOG_NOTICE, _("Ready"));
 499         else {
 500                 logger(LOG_ERR, _("Unable to create any listening socket!"));
 501                 return false;
 502         }
 503
 504         return true;
 505 }
 506
 507 /*
 508   setup all initial network connections
 509 */
 510 bool setup_network_connections(void)
 511 {
 512         cp();
 513
 514         now = time(NULL);
 515
 516         init_connections();
 517         init_subnets();
 518         init_nodes();
 519         init_edges();
 520         init_events();
 521         init_requests();
 522
 523         if(get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) {
 524                 if(pingtimeout < 1) {
 525                         pingtimeout = 86400;
 526                 }
 527         } else
 528                 pingtimeout = 60;
 529
 530         if(!setup_myself())
 531                 return false;
 532
 533         try_outgoing_connections();
 534
 535         return true;
 536 }
 537
 538 /*
 539   close all open network connections
 540 */
 541 void close_network_connections(void)
 542 {
 543         avl_node_t *node, *next;
 544         connection_t *c;
 545         char *envp[5];
 546         int i;
 547
 548         cp();
 549
 550         for(node = connection_tree->head; node; node = next) {
 551                 next = node->next;
 552                 c = (connection_t *) node->data;
 553
 554                 if(c->outgoing)
 555                         free(c->outgoing->name), free(c->outgoing), c->outgoing = NULL;
 556                 terminate_connection(c, false);
 557         }
 558
 559         if(myself && myself->connection)
 560                 terminate_connection(myself->connection, false);
 561
 562         for(i = 0; i < listen_sockets; i++) {
 563                 close(listen_socket[i].tcp);
 564                 close(listen_socket[i].udp);
 565         }
 566
 567         exit_requests();
 568         exit_events();
 569         exit_edges();
 570         exit_subnets();
 571         exit_nodes();
 572         exit_connections();
 573
 574         asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 575         asprintf(&envp[1], "DEVICE=%s", device ? : "");
 576         asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 577         asprintf(&envp[3], "NAME=%s", myself->name);
 578         envp[4] = NULL;
 579
 580         execute_script("tinc-down", envp);
 581
 582         for(i = 0; i < 4; i++)
 583                 free(envp[i]);
 584
 585         close_device();
 586
 587         return;
 588 }