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 <gnutls/gnutls.h>
  26 #include <gnutls/x509.h>
  27 #include <gcrypt.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 #if 0
  48 bool read_rsa_public_key(connection_t *c)
  49 {
  50         FILE *fp;
  51         char *fname;
  52         char *key;
  53
  54         cp();
  55
  56         if(!c->rsa_key) {
  57                 c->rsa_key = RSA_new();
  58 //              RSA_blinding_on(c->rsa_key, NULL);
  59         }
  60
  61         /* First, check for simple PublicKey statement */
  62
  63         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
  64                 BN_hex2bn(&c->rsa_key->n, key);
  65                 BN_hex2bn(&c->rsa_key->e, "FFFF");
  66                 free(key);
  67                 return true;
  68         }
  69
  70         /* Else, check for PublicKeyFile statement and read it */
  71
  72         if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
  73                 fp = fopen(fname, "r");
  74
  75                 if(!fp) {
  76                         logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
  77                                    fname, strerror(errno));
  78                         free(fname);
  79                         return false;
  80                 }
  81
  82                 free(fname);
  83                 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
  84                 fclose(fp);
  85
  86                 if(c->rsa_key)
  87                         return true;            /* Woohoo. */
  88
  89                 /* If it fails, try PEM_read_RSA_PUBKEY. */
  90                 fp = fopen(fname, "r");
  91
  92                 if(!fp) {
  93                         logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
  94                                    fname, strerror(errno));
  95                         free(fname);
  96                         return false;
  97                 }
  98
  99                 free(fname);
 100                 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
 101                 fclose(fp);
 102
 103                 if(c->rsa_key) {
 104 //                              RSA_blinding_on(c->rsa_key, NULL);
 105                         return true;
 106                 }
 107
 108                 logger(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"),
 109                            fname, strerror(errno));
 110                 return false;
 111         }
 112
 113         /* Else, check if a harnessed public key is in the config file */
 114
 115         asprintf(&fname, "%s/hosts/%s", confbase, c->name);
 116         fp = fopen(fname, "r");
 117
 118         if(fp) {
 119                 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
 120                 fclose(fp);
 121         }
 122
 123         free(fname);
 124
 125         if(c->rsa_key)
 126                 return true;
 127
 128         /* Try again with PEM_read_RSA_PUBKEY. */
 129
 130         asprintf(&fname, "%s/hosts/%s", confbase, c->name);
 131         fp = fopen(fname, "r");
 132
 133         if(fp) {
 134                 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
 135 //              RSA_blinding_on(c->rsa_key, NULL);
 136                 fclose(fp);
 137         }
 138
 139         free(fname);
 140
 141         if(c->rsa_key)
 142                 return true;
 143
 144         logger(LOG_ERR, _("No public key for %s specified!"), c->name);
 145
 146         return false;
 147 }
 148 #endif
 149
 150 bool setup_credentials(void)
 151 {
 152         char *trust = NULL, *crl = NULL;
 153         char *key = NULL, *cert = NULL;
 154         int result;
 155
 156         cp();
 157
 158         gnutls_certificate_allocate_credentials(&myself->connection->credentials);
 159
 160         if(get_config_string(lookup_config(config_tree, "TrustFile"), &trust)) {
 161                 result = gnutls_certificate_set_x509_trust_file(myself->connection->credentials, trust, GNUTLS_X509_FMT_PEM);
 162                 if(result < 0) {
 163                         logger(LOG_ERR, _("Error reading trust file '%s': %s"), trust, gnutls_strerror(result));
 164                         free(trust);
 165                         return false;
 166                 }
 167                 free(trust);
 168         }
 169
 170         if(get_config_string(lookup_config(config_tree, "CRLFile"), &crl)) {
 171                 result = gnutls_certificate_set_x509_crl_file(myself->connection->credentials, crl, GNUTLS_X509_FMT_PEM);
 172                 if(result) {
 173                         logger(LOG_ERR, _("Error reading CRL file '%s': %s"), crl, gnutls_strerror(result));
 174                         free(crl);
 175                         return false;
 176                 }
 177                 free(crl);
 178         }
 179
 180         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &key))
 181                 asprintf(&key, "%s/rsa_key.priv", confbase);
 182
 183         if(!get_config_string(lookup_config(config_tree, "CertificateFile"), &cert))
 184                 asprintf(&cert, "%s/hosts/%s", confbase, myself->name);
 185
 186
 187         gnutls_certificate_set_x509_trust_file(myself->connection->credentials, cert, GNUTLS_X509_FMT_PEM);
 188         logger(LOG_DEBUG, _("JOEHOE"));
 189         gnutls_certificate_set_verify_flags(myself->connection->credentials, GNUTLS_VERIFY_DISABLE_CA_SIGN);
 190
 191         result = gnutls_certificate_set_x509_key_file(myself->connection->credentials, cert, key, GNUTLS_X509_FMT_PEM);
 192
 193         if(result) {
 194                 logger(LOG_ERR, _("Error reading credentials from %s and %s: %s"), cert, key, gnutls_strerror(result));
 195                 free(key);
 196                 free(cert);
 197                 return false;
 198         }
 199
 200         free(key);
 201         free(cert);
 202
 203         return true;
 204 }
 205
 206 /*
 207   Configure node_t myself and set up the local sockets (listen only)
 208 */
 209 bool setup_myself(void)
 210 {
 211         config_t *cfg;
 212         subnet_t *subnet;
 213         char *name, *hostname, *mode, *afname, *cipher, *digest;
 214         char *address = NULL;
 215         char *envp[5];
 216         struct addrinfo *ai, *aip, hint = {0};
 217         bool choice;
 218         int i, err, result;
 219
 220         cp();
 221
 222         myself = new_node();
 223         myself->connection = new_connection();
 224         init_configuration(&myself->connection->config_tree);
 225
 226         asprintf(&myself->hostname, _("MYSELF"));
 227         asprintf(&myself->connection->hostname, _("MYSELF"));
 228
 229         myself->connection->options = 0;
 230         myself->connection->protocol_version = PROT_CURRENT;
 231
 232         if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {     /* Not acceptable */
 233                 logger(LOG_ERR, _("Name for tinc daemon required!"));
 234                 return false;
 235         }
 236
 237         if(!check_id(name)) {
 238                 logger(LOG_ERR, _("Invalid name for myself!"));
 239                 free(name);
 240                 return false;
 241         }
 242
 243         myself->name = name;
 244         myself->connection->name = xstrdup(name);
 245
 246         if(!setup_credentials())
 247                 return false;
 248
 249         if(!read_connection_config(myself->connection)) {
 250                 logger(LOG_ERR, _("Cannot open host configuration file for myself!"));
 251                 return false;
 252         }
 253
 254         if(!get_config_string (lookup_config(myself->connection->config_tree, "Port"), &myport))
 255                 asprintf(&myport, "655");
 256
 257         /* Read in all the subnets specified in the host configuration file */
 258
 259         cfg = lookup_config(myself->connection->config_tree, "Subnet");
 260
 261         while(cfg) {
 262                 if(!get_config_subnet(cfg, &subnet))
 263                         return false;
 264
 265                 subnet_add(myself, subnet);
 266
 267                 cfg = lookup_config_next(myself->connection->config_tree, cfg);
 268         }
 269
 270         /* Check some options */
 271
 272         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 273                 myself->options |= OPTION_INDIRECT;
 274
 275         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 276                 myself->options |= OPTION_TCPONLY;
 277
 278         if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice) && choice)
 279                 myself->options |= OPTION_INDIRECT;
 280
 281         if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice) && choice)
 282                 myself->options |= OPTION_TCPONLY;
 283
 284         if(get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) && choice)
 285                 myself->options |= OPTION_PMTU_DISCOVERY;
 286
 287         if(myself->options & OPTION_TCPONLY)
 288                 myself->options |= OPTION_INDIRECT;
 289
 290         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 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(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 (lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) {
 344                 if(!strcasecmp(cipher, "none")) {
 345                         myself->cipher = GCRY_CIPHER_NONE;
 346                 } else {
 347                         myself->cipher = gcry_cipher_map_name(cipher);
 348
 349                         if(!myself->cipher) {
 350                                 logger(LOG_ERR, _("Unrecognized cipher type!"));
 351                                 return false;
 352                         }
 353                 }
 354         } else
 355                 myself->cipher = GCRY_CIPHER_AES;
 356
 357         if(myself->cipher) {
 358                 result = gcry_cipher_open(&myself->cipher_ctx, myself->cipher, GCRY_CIPHER_MODE_CBC, GCRY_CIPHER_SECURE);
 359
 360                 if(result) {
 361                         logger(LOG_ERR, _("Error during initialisation of cipher for %s (%s): %s"),
 362                                         myself->name, myself->hostname, gcry_strerror(result));
 363                         return false;
 364                 }
 365
 366         }
 367
 368         if(myself->cipher) {
 369                 myself->cipherkeylen = gcry_cipher_get_algo_keylen(myself->cipher);
 370                 myself->cipherblklen = gcry_cipher_get_algo_blklen(myself->cipher);
 371         } else {
 372                 myself->cipherkeylen = 1;
 373         }
 374
 375         logger(LOG_DEBUG, _("Key %s len %d"), gcry_cipher_algo_name(myself->cipher), myself->cipherkeylen);
 376         myself->cipherkey = xmalloc(myself->cipherkeylen);
 377         gcry_randomize(myself->cipherkey, myself->cipherkeylen, GCRY_STRONG_RANDOM);
 378         if(myself->cipher)
 379                 gcry_cipher_setkey(myself->cipher_ctx, myself->cipherkey, myself->cipherkeylen);
 380
 381         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 382                 keylifetime = 3600;
 383
 384         keyexpires = now + keylifetime;
 385
 386         /* Check if we want to use message authentication codes... */
 387
 388         if(get_config_string (lookup_config(myself->connection->config_tree, "Digest"), &digest)) {
 389                 if(!strcasecmp(digest, "none")) {
 390                         myself->digest = GCRY_MD_NONE;
 391                 } else {
 392                         myself->digest = gcry_md_map_name(digest);
 393
 394                         if(!myself->digest) {
 395                                 logger(LOG_ERR, _("Unrecognized digest type!"));
 396                                 return false;
 397                         }
 398                 }
 399         } else
 400                 myself->digest = GCRY_MD_SHA1;
 401
 402
 403         if(myself->digest) {
 404                 result = gcry_md_open(&myself->digest_ctx, myself->digest, GCRY_MD_FLAG_SECURE | GCRY_MD_FLAG_HMAC);
 405
 406                 if(result) {
 407                         logger(LOG_ERR, _("Error during initialisation of digest for %s (%s): %s"),
 408                                         myself->name, myself->hostname, gcry_strerror(result));
 409                         return false;
 410                 }
 411
 412         }
 413
 414         if(myself->digest) {
 415                 myself->digestlen = gcry_md_get_algo_dlen(myself->digest);
 416         } else {
 417                 myself->digestlen = 1;
 418         }
 419
 420         myself->digestkey = xmalloc(myself->digestlen);
 421         gcry_randomize(myself->digestkey, myself->digestlen, GCRY_STRONG_RANDOM);
 422         if(myself->digest)
 423                 gcry_md_setkey(myself->digest_ctx, myself->digestkey, myself->digestlen);
 424
 425         if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &myself->maclength)) {
 426                 if(myself->digest) {
 427                         if(myself->maclength > myself->digestlen) {
 428                                 logger(LOG_ERR, _("MAC length exceeds size of digest!"));
 429                                 return false;
 430                         } else if(myself->maclength < 0) {
 431                                 logger(LOG_ERR, _("Bogus MAC length!"));
 432                                 return false;
 433                         }
 434                 }
 435         } else
 436                 myself->maclength = 4;
 437
 438         /* Compression */
 439
 440         if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"),
 441                 &myself->compression)) {
 442                 if(myself->compression < 0 || myself->compression > 11) {
 443                         logger(LOG_ERR, _("Bogus compression level!"));
 444                         return false;
 445                 }
 446         } else
 447                 myself->compression = 0;
 448
 449         /* Done */
 450
 451         myself->nexthop = myself;
 452         myself->via = myself;
 453         myself->status.active = true;
 454         myself->status.reachable = true;
 455         node_add(myself);
 456
 457         graph();
 458
 459         /* Open device */
 460
 461         if(!setup_device())
 462                 return false;
 463
 464         /* Run tinc-up script to further initialize the tap interface */
 465         asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 466         asprintf(&envp[1], "DEVICE=%s", device ? : "");
 467         asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 468         asprintf(&envp[3], "NAME=%s", myself->name);
 469         envp[4] = NULL;
 470
 471         execute_script("tinc-up", envp);
 472
 473         for(i = 0; i < 5; i++)
 474                 free(envp[i]);
 475
 476         /* Open sockets */
 477
 478         get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
 479
 480         hint.ai_family = addressfamily;
 481         hint.ai_socktype = SOCK_STREAM;
 482         hint.ai_protocol = IPPROTO_TCP;
 483         hint.ai_flags = AI_PASSIVE;
 484
 485         err = getaddrinfo(address, myport, &hint, &ai);
 486
 487         if(err || !ai) {
 488                 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
 489                            gai_strerror(err));
 490                 return false;
 491         }
 492
 493         listen_sockets = 0;
 494
 495         for(aip = ai; aip; aip = aip->ai_next) {
 496                 listen_socket[listen_sockets].tcp =
 497                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 498
 499                 if(listen_socket[listen_sockets].tcp < 0)
 500                         continue;
 501
 502                 listen_socket[listen_sockets].udp =
 503                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 504
 505                 if(listen_socket[listen_sockets].udp < 0)
 506                         continue;
 507
 508                 ifdebug(CONNECTIONS) {
 509                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 510                         logger(LOG_NOTICE, _("Listening on %s"), hostname);
 511                         free(hostname);
 512                 }
 513
 514                 listen_socket[listen_sockets].sa.sa = *aip->ai_addr;
 515                 listen_sockets++;
 516         }
 517
 518         freeaddrinfo(ai);
 519
 520         if(listen_sockets)
 521                 logger(LOG_NOTICE, _("Ready"));
 522         else {
 523                 logger(LOG_ERR, _("Unable to create any listening socket!"));
 524                 return false;
 525         }
 526
 527         return true;
 528 }
 529
 530 /*
 531   setup all initial network connections
 532 */
 533 bool setup_network_connections(void)
 534 {
 535         cp();
 536
 537         now = time(NULL);
 538
 539         init_connections();
 540         init_subnets();
 541         init_nodes();
 542         init_edges();
 543         init_events();
 544         init_requests();
 545
 546         if(get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) {
 547                 if(pingtimeout < 1) {
 548                         pingtimeout = 86400;
 549                 }
 550         } else
 551                 pingtimeout = 60;
 552
 553         if(!setup_myself())
 554                 return false;
 555
 556         try_outgoing_connections();
 557
 558         return true;
 559 }
 560
 561 /*
 562   close all open network connections
 563 */
 564 void close_network_connections(void)
 565 {
 566         avl_node_t *node, *next;
 567         connection_t *c;
 568         char *envp[5];
 569         int i;
 570
 571         cp();
 572
 573         for(node = connection_tree->head; node; node = next) {
 574                 next = node->next;
 575                 c = node->data;
 576
 577                 if(c->outgoing)
 578                         free(c->outgoing->name), free(c->outgoing), c->outgoing = NULL;
 579                 terminate_connection(c, false);
 580         }
 581
 582         if(myself && myself->connection)
 583                 terminate_connection(myself->connection, false);
 584
 585         for(i = 0; i < listen_sockets; i++) {
 586                 close(listen_socket[i].tcp);
 587                 close(listen_socket[i].udp);
 588         }
 589
 590         exit_requests();
 591         exit_events();
 592         exit_edges();
 593         exit_subnets();
 594         exit_nodes();
 595         exit_connections();
 596
 597         asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 598         asprintf(&envp[1], "DEVICE=%s", device ? : "");
 599         asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 600         asprintf(&envp[3], "NAME=%s", myself->name);
 601         envp[4] = NULL;
 602
 603         execute_script("tinc-down", envp);
 604
 605         for(i = 0; i < 4; i++)
 606                 free(envp[i]);
 607
 608         close_device();
 609
 610         return;
 611 }