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 1.1.2.50 2003/12/20 21:25:17 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 #include <openssl/err.h>
  29 #include <openssl/evp.h>
  30
  31 #include "avl_tree.h"
  32 #include "conf.h"
  33 #include "connection.h"
  34 #include "device.h"
  35 #include "event.h"
  36 #include "graph.h"
  37 #include "logger.h"
  38 #include "net.h"
  39 #include "netutl.h"
  40 #include "process.h"
  41 #include "protocol.h"
  42 #include "route.h"
  43 #include "subnet.h"
  44 #include "utils.h"
  45 #include "xalloc.h"
  46
  47 char *myport;
  48
  49 bool read_rsa_public_key(connection_t *c)
  50 {
  51         FILE *fp;
  52         char *fname;
  53         char *key;
  54
  55         cp();
  56
  57         if(!c->rsa_key) {
  58                 c->rsa_key = RSA_new();
  59 //              RSA_blinding_on(c->rsa_key, NULL);
  60         }
  61
  62         /* First, check for simple PublicKey statement */
  63
  64         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
  65                 BN_hex2bn(&c->rsa_key->n, key);
  66                 BN_hex2bn(&c->rsa_key->e, "FFFF");
  67                 free(key);
  68                 return true;
  69         }
  70
  71         /* Else, check for PublicKeyFile statement and read it */
  72
  73         if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
  74                 fp = fopen(fname, "r");
  75
  76                 if(!fp) {
  77                         logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
  78                                    fname, strerror(errno));
  79                         free(fname);
  80                         return false;
  81                 }
  82
  83                 free(fname);
  84                 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
  85                 fclose(fp);
  86
  87                 if(c->rsa_key)
  88                         return true;            /* Woohoo. */
  89
  90                 /* If it fails, try PEM_read_RSA_PUBKEY. */
  91                 fp = fopen(fname, "r");
  92
  93                 if(!fp) {
  94                         logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
  95                                    fname, strerror(errno));
  96                         free(fname);
  97                         return false;
  98                 }
  99
 100                 free(fname);
 101                 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
 102                 fclose(fp);
 103
 104                 if(c->rsa_key) {
 105 //                              RSA_blinding_on(c->rsa_key, NULL);
 106                         return true;
 107                 }
 108
 109                 logger(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"),
 110                            fname, strerror(errno));
 111                 return false;
 112         }
 113
 114         /* Else, check if a harnessed public key is in the config file */
 115
 116         asprintf(&fname, "%s/hosts/%s", confbase, c->name);
 117         fp = fopen(fname, "r");
 118
 119         if(fp) {
 120                 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
 121                 fclose(fp);
 122         }
 123
 124         free(fname);
 125
 126         if(c->rsa_key)
 127                 return true;
 128
 129         /* Try again with PEM_read_RSA_PUBKEY. */
 130
 131         asprintf(&fname, "%s/hosts/%s", confbase, c->name);
 132         fp = fopen(fname, "r");
 133
 134         if(fp) {
 135                 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
 136 //              RSA_blinding_on(c->rsa_key, NULL);
 137                 fclose(fp);
 138         }
 139
 140         free(fname);
 141
 142         if(c->rsa_key)
 143                 return true;
 144
 145         logger(LOG_ERR, _("No public key for %s specified!"), c->name);
 146
 147         return false;
 148 }
 149
 150 bool read_rsa_private_key(void)
 151 {
 152         FILE *fp;
 153         char *fname, *key;
 154         struct stat s;
 155
 156         cp();
 157
 158         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
 159                 myself->connection->rsa_key = RSA_new();
 160 //              RSA_blinding_on(myself->connection->rsa_key, NULL);
 161                 BN_hex2bn(&myself->connection->rsa_key->d, key);
 162                 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
 163                 free(key);
 164                 return true;
 165         }
 166
 167         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 168                 asprintf(&fname, "%s/rsa_key.priv", confbase);
 169
 170         fp = fopen(fname, "r");
 171
 172         if(!fp) {
 173                 logger(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
 174                            fname, strerror(errno));
 175                 free(fname);
 176                 return false;
 177         }
 178
 179 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 180         if(fstat(fileno(fp), &s)) {
 181                 logger(LOG_ERR, _("Could not stat RSA private key file `%s': %s'"),
 182                                 fname, strerror(errno));
 183                 free(fname);
 184                 return false;
 185         }
 186
 187         if(s.st_mode & ~0100700)
 188                 logger(LOG_WARNING, _("Warning: insecure file permissions for RSA private key file `%s'!"), fname);
 189 #endif
 190
 191         myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
 192         fclose(fp);
 193
 194         if(!myself->connection->rsa_key) {
 195                 logger(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"),
 196                            fname, strerror(errno));
 197                 free(fname);
 198                 return false;
 199         }
 200
 201         free(fname);
 202         return true;
 203 }
 204
 205 /*
 206   Configure node_t myself and set up the local sockets (listen only)
 207 */
 208 bool setup_myself(void)
 209 {
 210         config_t *cfg;
 211         subnet_t *subnet;
 212         char *name, *hostname, *mode, *afname, *cipher, *digest;
 213         char *address = NULL;
 214         char *envp[5];
 215         struct addrinfo *ai, *aip, hint = {0};
 216         bool choice;
 217         int i, err;
 218
 219         cp();
 220
 221         myself = new_node();
 222         myself->connection = new_connection();
 223         init_configuration(&myself->connection->config_tree);
 224
 225         asprintf(&myself->hostname, _("MYSELF"));
 226         asprintf(&myself->connection->hostname, _("MYSELF"));
 227
 228         myself->connection->options = 0;
 229         myself->connection->protocol_version = PROT_CURRENT;
 230
 231         if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {     /* Not acceptable */
 232                 logger(LOG_ERR, _("Name for tinc daemon required!"));
 233                 return false;
 234         }
 235
 236         if(!check_id(name)) {
 237                 logger(LOG_ERR, _("Invalid name for myself!"));
 238                 free(name);
 239                 return false;
 240         }
 241
 242         myself->name = name;
 243         myself->connection->name = xstrdup(name);
 244
 245         if(!read_rsa_private_key())
 246                 return false;
 247
 248         if(!read_connection_config(myself->connection)) {
 249                 logger(LOG_ERR, _("Cannot open host configuration file for myself!"));
 250                 return false;
 251         }
 252
 253         if(!read_rsa_public_key(myself->connection))
 254                 return false;
 255
 256         if(!get_config_string
 257            (lookup_config(myself->connection->config_tree, "Port"), &myport))
 258                 asprintf(&myport, "655");
 259
 260         /* Read in all the subnets specified in the host configuration file */
 261
 262         cfg = lookup_config(myself->connection->config_tree, "Subnet");
 263
 264         while(cfg) {
 265                 if(!get_config_subnet(cfg, &subnet))
 266                         return false;
 267
 268                 subnet_add(myself, subnet);
 269
 270                 cfg = lookup_config_next(myself->connection->config_tree, cfg);
 271         }
 272
 273         /* Check some options */
 274
 275         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 276                 myself->options |= OPTION_INDIRECT;
 277
 278         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 279                 myself->options |= OPTION_TCPONLY;
 280
 281         if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice) && choice)
 282                 myself->options |= OPTION_INDIRECT;
 283
 284         if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice) && choice)
 285                 myself->options |= OPTION_TCPONLY;
 286
 287         if(get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) && choice)
 288                 myself->options |= OPTION_PMTU_DISCOVERY;
 289
 290         if(myself->options & OPTION_TCPONLY)
 291                 myself->options |= OPTION_INDIRECT;
 292
 293         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 294
 295         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 296                 if(!strcasecmp(mode, "router"))
 297                         routing_mode = RMODE_ROUTER;
 298                 else if(!strcasecmp(mode, "switch"))
 299                         routing_mode = RMODE_SWITCH;
 300                 else if(!strcasecmp(mode, "hub"))
 301                         routing_mode = RMODE_HUB;
 302                 else {
 303                         logger(LOG_ERR, _("Invalid routing mode!"));
 304                         return false;
 305                 }
 306                 free(mode);
 307         } else
 308                 routing_mode = RMODE_ROUTER;
 309
 310         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 311
 312 #if !defined(SOL_IP) || !defined(IP_TOS)
 313         if(priorityinheritance)
 314                 logger(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
 315 #endif
 316
 317         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 318                 macexpire = 600;
 319
 320         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 321                 if(maxtimeout <= 0) {
 322                         logger(LOG_ERR, _("Bogus maximum timeout!"));
 323                         return false;
 324                 }
 325         } else
 326                 maxtimeout = 900;
 327
 328         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 329                 if(!strcasecmp(afname, "IPv4"))
 330                         addressfamily = AF_INET;
 331                 else if(!strcasecmp(afname, "IPv6"))
 332                         addressfamily = AF_INET6;
 333                 else if(!strcasecmp(afname, "any"))
 334                         addressfamily = AF_UNSPEC;
 335                 else {
 336                         logger(LOG_ERR, _("Invalid address family!"));
 337                         return false;
 338                 }
 339                 free(afname);
 340         }
 341
 342         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 343
 344         /* Generate packet encryption key */
 345
 346         if(get_config_string
 347            (lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) {
 348                 if(!strcasecmp(cipher, "none")) {
 349                         myself->cipher = NULL;
 350                 } else {
 351                         myself->cipher = EVP_get_cipherbyname(cipher);
 352
 353                         if(!myself->cipher) {
 354                                 logger(LOG_ERR, _("Unrecognized cipher type!"));
 355                                 return false;
 356                         }
 357                 }
 358         } else
 359                 myself->cipher = EVP_bf_cbc();
 360
 361         if(myself->cipher)
 362                 myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
 363         else
 364                 myself->keylength = 1;
 365
 366         myself->connection->outcipher = EVP_bf_ofb();
 367
 368         myself->key = xmalloc(myself->keylength);
 369         RAND_pseudo_bytes(myself->key, myself->keylength);
 370
 371         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 372                 keylifetime = 3600;
 373
 374         keyexpires = now + keylifetime;
 375
 376         if(myself->cipher) {
 377                 EVP_CIPHER_CTX_init(&packet_ctx);
 378                 if(!EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, myself->key, myself->key + myself->cipher->key_len)) {
 379                         logger(LOG_ERR, _("Error during initialisation of cipher for %s (%s): %s"),
 380                                         myself->name, myself->hostname, ERR_error_string(ERR_get_error(), NULL));
 381                         return false;
 382                 }
 383
 384         }
 385
 386         /* Check if we want to use message authentication codes... */
 387
 388         if(get_config_string
 389            (lookup_config(myself->connection->config_tree, "Digest"), &digest)) {
 390                 if(!strcasecmp(digest, "none")) {
 391                         myself->digest = NULL;
 392                 } else {
 393                         myself->digest = EVP_get_digestbyname(digest);
 394
 395                         if(!myself->digest) {
 396                                 logger(LOG_ERR, _("Unrecognized digest type!"));
 397                                 return false;
 398                         }
 399                 }
 400         } else
 401                 myself->digest = EVP_sha1();
 402
 403         myself->connection->outdigest = EVP_sha1();
 404
 405         if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"),
 406                 &myself->maclength)) {
 407                 if(myself->digest) {
 408                         if(myself->maclength > myself->digest->md_size) {
 409                                 logger(LOG_ERR, _("MAC length exceeds size of digest!"));
 410                                 return false;
 411                         } else if(myself->maclength < 0) {
 412                                 logger(LOG_ERR, _("Bogus MAC length!"));
 413                                 return false;
 414                         }
 415                 }
 416         } else
 417                 myself->maclength = 4;
 418
 419         myself->connection->outmaclength = 0;
 420
 421         /* Compression */
 422
 423         if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"),
 424                 &myself->compression)) {
 425                 if(myself->compression < 0 || myself->compression > 11) {
 426                         logger(LOG_ERR, _("Bogus compression level!"));
 427                         return false;
 428                 }
 429         } else
 430                 myself->compression = 0;
 431
 432         myself->connection->outcompression = 0;
 433
 434         /* Done */
 435
 436         myself->nexthop = myself;
 437         myself->via = myself;
 438         myself->status.active = true;
 439         myself->status.reachable = true;
 440         node_add(myself);
 441
 442         graph();
 443
 444         /* Open device */
 445
 446         if(!setup_device())
 447                 return false;
 448
 449         /* Run tinc-up script to further initialize the tap interface */
 450         asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 451         asprintf(&envp[1], "DEVICE=%s", device ? : "");
 452         asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 453         asprintf(&envp[3], "NAME=%s", myself->name);
 454         envp[4] = NULL;
 455
 456         execute_script("tinc-up", envp);
 457
 458         for(i = 0; i < 5; i++)
 459                 free(envp[i]);
 460
 461         /* Open sockets */
 462
 463         get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
 464
 465         hint.ai_family = addressfamily;
 466         hint.ai_socktype = SOCK_STREAM;
 467         hint.ai_protocol = IPPROTO_TCP;
 468         hint.ai_flags = AI_PASSIVE;
 469
 470         err = getaddrinfo(address, myport, &hint, &ai);
 471
 472         if(err || !ai) {
 473                 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
 474                            gai_strerror(err));
 475                 return false;
 476         }
 477
 478         listen_sockets = 0;
 479
 480         for(aip = ai; aip; aip = aip->ai_next) {
 481                 listen_socket[listen_sockets].tcp =
 482                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 483
 484                 if(listen_socket[listen_sockets].tcp < 0)
 485                         continue;
 486
 487                 listen_socket[listen_sockets].udp =
 488                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 489
 490                 if(listen_socket[listen_sockets].udp < 0)
 491                         continue;
 492
 493                 ifdebug(CONNECTIONS) {
 494                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 495                         logger(LOG_NOTICE, _("Listening on %s"), hostname);
 496                         free(hostname);
 497                 }
 498
 499                 listen_socket[listen_sockets].sa.sa = *aip->ai_addr;
 500                 listen_sockets++;
 501         }
 502
 503         freeaddrinfo(ai);
 504
 505         if(listen_sockets)
 506                 logger(LOG_NOTICE, _("Ready"));
 507         else {
 508                 logger(LOG_ERR, _("Unable to create any listening socket!"));
 509                 return false;
 510         }
 511
 512         return true;
 513 }
 514
 515 /*
 516   setup all initial network connections
 517 */
 518 bool setup_network_connections(void)
 519 {
 520         cp();
 521
 522         now = time(NULL);
 523
 524         init_connections();
 525         init_subnets();
 526         init_nodes();
 527         init_edges();
 528         init_events();
 529         init_requests();
 530
 531         if(get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) {
 532                 if(pingtimeout < 1) {
 533                         pingtimeout = 86400;
 534                 }
 535         } else
 536                 pingtimeout = 60;
 537
 538         if(!setup_myself())
 539                 return false;
 540
 541         try_outgoing_connections();
 542
 543         return true;
 544 }
 545
 546 /*
 547   close all open network connections
 548 */
 549 void close_network_connections(void)
 550 {
 551         avl_node_t *node, *next;
 552         connection_t *c;
 553         char *envp[5];
 554         int i;
 555
 556         cp();
 557
 558         for(node = connection_tree->head; node; node = next) {
 559                 next = node->next;
 560                 c = node->data;
 561
 562                 if(c->outgoing)
 563                         free(c->outgoing->name), free(c->outgoing), c->outgoing = NULL;
 564                 terminate_connection(c, false);
 565         }
 566
 567         if(myself && myself->connection)
 568                 terminate_connection(myself->connection, false);
 569
 570         for(i = 0; i < listen_sockets; i++) {
 571                 close(listen_socket[i].tcp);
 572                 close(listen_socket[i].udp);
 573         }
 574
 575         exit_requests();
 576         exit_events();
 577         exit_edges();
 578         exit_subnets();
 579         exit_nodes();
 580         exit_connections();
 581
 582         asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 583         asprintf(&envp[1], "DEVICE=%s", device ? : "");
 584         asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 585         asprintf(&envp[3], "NAME=%s", myself->name);
 586         envp[4] = NULL;
 587
 588         execute_script("tinc-down", envp);
 589
 590         for(i = 0; i < 4; i++)
 591                 free(envp[i]);
 592
 593         close_device();
 594
 595         return;
 596 }