www.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 1.1.2.41 2003/07/30 11:50:45 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
 153         cp();
 154
 155         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
 156                 myself->connection->rsa_key = RSA_new();
 157 //              RSA_blinding_on(myself->connection->rsa_key, NULL);
 158                 BN_hex2bn(&myself->connection->rsa_key->d, key);
 159                 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
 160                 free(key);
 161                 return true;
 162         }
 163
 164         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 165                 asprintf(&fname, "%s/rsa_key.priv", confbase);
 166
 167         if(is_safe_path(fname)) {
 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                 free(fname);
 178                 myself->connection->rsa_key =
 179                         PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
 180                 fclose(fp);
 181
 182                 if(!myself->connection->rsa_key) {
 183                         logger(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"),
 184                                    fname, strerror(errno));
 185                         return false;
 186                 }
 187
 188                 return true;
 189         }
 190
 191         free(fname);
 192         return false;
 193 }
 194
 195 /*
 196   Configure node_t myself and set up the local sockets (listen only)
 197 */
 198 bool setup_myself(void)
 199 {
 200         config_t *cfg;
 201         subnet_t *subnet;
 202         char *name, *hostname, *mode, *afname, *cipher, *digest;
 203         char *address = NULL;
 204         char *envp[5];
 205         struct addrinfo *ai, *aip, hint = {0};
 206         bool choice;
 207         int i, err;
 208
 209         cp();
 210
 211         myself = new_node();
 212         myself->connection = new_connection();
 213         init_configuration(&myself->connection->config_tree);
 214
 215         asprintf(&myself->hostname, _("MYSELF"));
 216         asprintf(&myself->connection->hostname, _("MYSELF"));
 217
 218         myself->connection->options = 0;
 219         myself->connection->protocol_version = PROT_CURRENT;
 220
 221         if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {     /* Not acceptable */
 222                 logger(LOG_ERR, _("Name for tinc daemon required!"));
 223                 return false;
 224         }
 225
 226         if(!check_id(name)) {
 227                 logger(LOG_ERR, _("Invalid name for myself!"));
 228                 free(name);
 229                 return false;
 230         }
 231
 232         myself->name = name;
 233         myself->connection->name = xstrdup(name);
 234
 235         if(!read_rsa_private_key())
 236                 return false;
 237
 238         if(!read_connection_config(myself->connection)) {
 239                 logger(LOG_ERR, _("Cannot open host configuration file for myself!"));
 240                 return false;
 241         }
 242
 243         if(!read_rsa_public_key(myself->connection))
 244                 return false;
 245
 246         if(!get_config_string
 247            (lookup_config(myself->connection->config_tree, "Port"), &myport))
 248                 asprintf(&myport, "655");
 249
 250         /* Read in all the subnets specified in the host configuration file */
 251
 252         cfg = lookup_config(myself->connection->config_tree, "Subnet");
 253
 254         while(cfg) {
 255                 if(!get_config_subnet(cfg, &subnet))
 256                         return false;
 257
 258                 subnet_add(myself, subnet);
 259
 260                 cfg = lookup_config_next(myself->connection->config_tree, cfg);
 261         }
 262
 263         /* Check some options */
 264
 265         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice))
 266                 if(choice)
 267                         myself->options |= OPTION_INDIRECT;
 268
 269         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice))
 270                 if(choice)
 271                         myself->options |= OPTION_TCPONLY;
 272
 273         if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice))
 274                 if(choice)
 275                         myself->options |= OPTION_INDIRECT;
 276
 277         if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice))
 278                 if(choice)
 279                         myself->options |= OPTION_TCPONLY;
 280
 281         if(myself->options & OPTION_TCPONLY)
 282                 myself->options |= OPTION_INDIRECT;
 283
 284         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 285                 if(!strcasecmp(mode, "router"))
 286                         routing_mode = RMODE_ROUTER;
 287                 else if(!strcasecmp(mode, "switch"))
 288                         routing_mode = RMODE_SWITCH;
 289                 else if(!strcasecmp(mode, "hub"))
 290                         routing_mode = RMODE_HUB;
 291                 else {
 292                         logger(LOG_ERR, _("Invalid routing mode!"));
 293                         return false;
 294                 }
 295                 free(mode);
 296         } else
 297                 routing_mode = RMODE_ROUTER;
 298
 299         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 300
 301 #if !defined(SOL_IP) || !defined(IP_TOS)
 302         if(priorityinheritance)
 303                 logger(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
 304 #endif
 305
 306         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 307                 macexpire = 600;
 308
 309         if(get_config_int(lookup_config(myself->connection->config_tree, "MaxTimeout"), &maxtimeout)) {
 310                 if(maxtimeout <= 0) {
 311                         logger(LOG_ERR, _("Bogus maximum timeout!"));
 312                         return false;
 313                 }
 314         } else
 315                 maxtimeout = 900;
 316
 317         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 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                         logger(LOG_ERR, _("Invalid address family!"));
 326                         return false;
 327                 }
 328                 free(afname);
 329         }
 330
 331         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 332
 333         /* Generate packet encryption key */
 334
 335         if(get_config_string
 336            (lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) {
 337                 if(!strcasecmp(cipher, "none")) {
 338                         myself->cipher = NULL;
 339                 } else {
 340                         myself->cipher = EVP_get_cipherbyname(cipher);
 341
 342                         if(!myself->cipher) {
 343                                 logger(LOG_ERR, _("Unrecognized cipher type!"));
 344                                 return false;
 345                         }
 346                 }
 347         } else
 348                 myself->cipher = EVP_bf_cbc();
 349
 350         if(myself->cipher)
 351                 myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
 352         else
 353                 myself->keylength = 1;
 354
 355         myself->connection->outcipher = EVP_bf_ofb();
 356
 357         myself->key = (char *) xmalloc(myself->keylength);
 358         RAND_pseudo_bytes(myself->key, myself->keylength);
 359
 360         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 361                 keylifetime = 3600;
 362
 363         keyexpires = now + keylifetime;
 364
 365         if(myself->cipher) {
 366                 EVP_CIPHER_CTX_init(&packet_ctx);
 367                 EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, myself->key, myself->key + myself->cipher->key_len);
 368         }
 369
 370         /* Check if we want to use message authentication codes... */
 371
 372         if(get_config_string
 373            (lookup_config(myself->connection->config_tree, "Digest"), &digest)) {
 374                 if(!strcasecmp(digest, "none")) {
 375                         myself->digest = NULL;
 376                 } else {
 377                         myself->digest = EVP_get_digestbyname(digest);
 378
 379                         if(!myself->digest) {
 380                                 logger(LOG_ERR, _("Unrecognized digest type!"));
 381                                 return false;
 382                         }
 383                 }
 384         } else
 385                 myself->digest = EVP_sha1();
 386
 387         myself->connection->outdigest = EVP_sha1();
 388
 389         if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"),
 390                 &myself->maclength)) {
 391                 if(myself->digest) {
 392                         if(myself->maclength > myself->digest->md_size) {
 393                                 logger(LOG_ERR, _("MAC length exceeds size of digest!"));
 394                                 return false;
 395                         } else if(myself->maclength < 0) {
 396                                 logger(LOG_ERR, _("Bogus MAC length!"));
 397                                 return false;
 398                         }
 399                 }
 400         } else
 401                 myself->maclength = 4;
 402
 403         myself->connection->outmaclength = 0;
 404
 405         /* Compression */
 406
 407         if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"),
 408                 &myself->compression)) {
 409                 if(myself->compression < 0 || myself->compression > 11) {
 410                         logger(LOG_ERR, _("Bogus compression level!"));
 411                         return false;
 412                 }
 413         } else
 414                 myself->compression = 0;
 415
 416         myself->connection->outcompression = 0;
 417
 418         /* Done */
 419
 420         myself->nexthop = myself;
 421         myself->via = myself;
 422         myself->status.active = true;
 423         myself->status.reachable = true;
 424         node_add(myself);
 425
 426         graph();
 427
 428         /* Open device */
 429
 430         if(!setup_device())
 431                 return false;
 432
 433         /* Run tinc-up script to further initialize the tap interface */
 434         asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 435         asprintf(&envp[1], "DEVICE=%s", device ? : "");
 436         asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 437         asprintf(&envp[3], "NAME=%s", myself->name);
 438         envp[4] = NULL;
 439
 440         execute_script("tinc-up", envp);
 441
 442         for(i = 0; i < 5; i++)
 443                 free(envp[i]);
 444
 445         /* Open sockets */
 446
 447         get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
 448
 449         hint.ai_family = addressfamily;
 450         hint.ai_socktype = SOCK_STREAM;
 451         hint.ai_protocol = IPPROTO_TCP;
 452         hint.ai_flags = AI_PASSIVE;
 453
 454         err = getaddrinfo(address, myport, &hint, &ai);
 455
 456         if(err || !ai) {
 457                 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
 458                            gai_strerror(err));
 459                 return false;
 460         }
 461
 462         listen_sockets = 0;
 463
 464         for(aip = ai; aip; aip = aip->ai_next) {
 465                 listen_socket[listen_sockets].tcp =
 466                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 467
 468                 if(listen_socket[listen_sockets].tcp < 0)
 469                         continue;
 470
 471                 listen_socket[listen_sockets].udp =
 472                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 473
 474                 if(listen_socket[listen_sockets].udp < 0)
 475                         continue;
 476
 477                 ifdebug(CONNECTIONS) {
 478                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 479                         logger(LOG_NOTICE, _("Listening on %s"), hostname);
 480                         free(hostname);
 481                 }
 482
 483                 listen_socket[listen_sockets].sa.sa = *aip->ai_addr;
 484                 listen_sockets++;
 485         }
 486
 487         freeaddrinfo(ai);
 488
 489         if(listen_sockets)
 490                 logger(LOG_NOTICE, _("Ready"));
 491         else {
 492                 logger(LOG_ERR, _("Unable to create any listening socket!"));
 493                 return false;
 494         }
 495
 496         return true;
 497 }
 498
 499 /*
 500   setup all initial network connections
 501 */
 502 bool setup_network_connections(void)
 503 {
 504         cp();
 505
 506         now = time(NULL);
 507
 508         init_connections();
 509         init_subnets();
 510         init_nodes();
 511         init_edges();
 512         init_events();
 513         init_requests();
 514
 515         if(get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) {
 516                 if(pingtimeout < 1) {
 517                         pingtimeout = 86400;
 518                 }
 519         } else
 520                 pingtimeout = 60;
 521
 522         if(!setup_myself())
 523                 return false;
 524
 525         try_outgoing_connections();
 526
 527         return true;
 528 }
 529
 530 /*
 531   close all open network connections
 532 */
 533 void close_network_connections(void)
 534 {
 535         avl_node_t *node, *next;
 536         connection_t *c;
 537         char *envp[5];
 538         int i;
 539
 540         cp();
 541
 542         for(node = connection_tree->head; node; node = next) {
 543                 next = node->next;
 544                 c = (connection_t *) node->data;
 545
 546                 if(c->outgoing)
 547                         free(c->outgoing->name), free(c->outgoing), c->outgoing = NULL;
 548                 terminate_connection(c, false);
 549         }
 550
 551         if(myself && myself->connection)
 552                 terminate_connection(myself->connection, false);
 553
 554         for(i = 0; i < listen_sockets; i++) {
 555                 close(listen_socket[i].tcp);
 556                 close(listen_socket[i].udp);
 557         }
 558
 559         exit_requests();
 560         exit_events();
 561         exit_edges();
 562         exit_subnets();
 563         exit_nodes();
 564         exit_connections();
 565
 566         asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 567         asprintf(&envp[1], "DEVICE=%s", device ? : "");
 568         asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 569         asprintf(&envp[3], "NAME=%s", myself->name);
 570         envp[4] = NULL;
 571
 572         execute_script("tinc-down", envp);
 573
 574         for(i = 0; i < 4; i++)
 575                 free(envp[i]);
 576
 577         close_device();
 578
 579         return;
 580 }