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 1.1.2.37 2003/07/22 20:55:20 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         struct addrinfo hint, *ai, *aip;
 205         bool choice;
 206         int err;
 207
 208         cp();
 209
 210         myself = new_node();
 211         myself->connection = new_connection();
 212         init_configuration(&myself->connection->config_tree);
 213
 214         asprintf(&myself->hostname, _("MYSELF"));
 215         asprintf(&myself->connection->hostname, _("MYSELF"));
 216
 217         myself->connection->options = 0;
 218         myself->connection->protocol_version = PROT_CURRENT;
 219
 220         if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {     /* Not acceptable */
 221                 logger(LOG_ERR, _("Name for tinc daemon required!"));
 222                 return false;
 223         }
 224
 225         if(!check_id(name)) {
 226                 logger(LOG_ERR, _("Invalid name for myself!"));
 227                 free(name);
 228                 return false;
 229         }
 230
 231         myself->name = name;
 232         myself->connection->name = xstrdup(name);
 233
 234         if(!read_rsa_private_key())
 235                 return false;
 236
 237         if(!read_connection_config(myself->connection)) {
 238                 logger(LOG_ERR, _("Cannot open host configuration file for myself!"));
 239                 return false;
 240         }
 241
 242         if(!read_rsa_public_key(myself->connection))
 243                 return false;
 244
 245         if(!get_config_string
 246            (lookup_config(myself->connection->config_tree, "Port"), &myport))
 247                 asprintf(&myport, "655");
 248
 249         /* Read in all the subnets specified in the host configuration file */
 250
 251         cfg = lookup_config(myself->connection->config_tree, "Subnet");
 252
 253         while(cfg) {
 254                 if(!get_config_subnet(cfg, &subnet))
 255                         return false;
 256
 257                 subnet_add(myself, subnet);
 258
 259                 cfg = lookup_config_next(myself->connection->config_tree, cfg);
 260         }
 261
 262         /* Check some options */
 263
 264         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice))
 265                 if(choice)
 266                         myself->options |= OPTION_INDIRECT;
 267
 268         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice))
 269                 if(choice)
 270                         myself->options |= OPTION_TCPONLY;
 271
 272         if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice))
 273                 if(choice)
 274                         myself->options |= OPTION_INDIRECT;
 275
 276         if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice))
 277                 if(choice)
 278                         myself->options |= OPTION_TCPONLY;
 279
 280         if(myself->options & OPTION_TCPONLY)
 281                 myself->options |= OPTION_INDIRECT;
 282
 283         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 284                 if(!strcasecmp(mode, "router"))
 285                         routing_mode = RMODE_ROUTER;
 286                 else if(!strcasecmp(mode, "switch"))
 287                         routing_mode = RMODE_SWITCH;
 288                 else if(!strcasecmp(mode, "hub"))
 289                         routing_mode = RMODE_HUB;
 290                 else {
 291                         logger(LOG_ERR, _("Invalid routing mode!"));
 292                         return false;
 293                 }
 294                 free(mode);
 295         } else
 296                 routing_mode = RMODE_ROUTER;
 297
 298         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 299
 300 #if !defined(SOL_IP) || !defined(IP_TOS)
 301         if(priorityinheritance)
 302                 logger(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
 303 #endif
 304
 305         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 306                 macexpire = 600;
 307
 308         if(get_config_int(lookup_config(myself->connection->config_tree, "MaxTimeout"), &maxtimeout)) {
 309                 if(maxtimeout <= 0) {
 310                         logger(LOG_ERR, _("Bogus maximum timeout!"));
 311                         return false;
 312                 }
 313         } else
 314                 maxtimeout = 900;
 315
 316         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 317                 if(!strcasecmp(afname, "IPv4"))
 318                         addressfamily = AF_INET;
 319                 else if(!strcasecmp(afname, "IPv6"))
 320                         addressfamily = AF_INET6;
 321                 else if(!strcasecmp(afname, "any"))
 322                         addressfamily = AF_UNSPEC;
 323                 else {
 324                         logger(LOG_ERR, _("Invalid address family!"));
 325                         return false;
 326                 }
 327                 free(afname);
 328         }
 329
 330         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 331
 332         /* Generate packet encryption key */
 333
 334         if(get_config_string
 335            (lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) {
 336                 if(!strcasecmp(cipher, "none")) {
 337                         myself->cipher = NULL;
 338                 } else {
 339                         myself->cipher = EVP_get_cipherbyname(cipher);
 340
 341                         if(!myself->cipher) {
 342                                 logger(LOG_ERR, _("Unrecognized cipher type!"));
 343                                 return false;
 344                         }
 345                 }
 346         } else
 347                 myself->cipher = EVP_bf_cbc();
 348
 349         if(myself->cipher)
 350                 myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
 351         else
 352                 myself->keylength = 1;
 353
 354         myself->connection->outcipher = EVP_bf_ofb();
 355
 356         myself->key = (char *) xmalloc(myself->keylength);
 357         RAND_pseudo_bytes(myself->key, myself->keylength);
 358
 359         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 360                 keylifetime = 3600;
 361
 362         keyexpires = now + keylifetime;
 363
 364         EVP_CIPHER_CTX_init(&packet_ctx);
 365         EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, myself->key, myself->key + myself->cipher->key_len);
 366
 367         /* Check if we want to use message authentication codes... */
 368
 369         if(get_config_string
 370            (lookup_config(myself->connection->config_tree, "Digest"), &digest)) {
 371                 if(!strcasecmp(digest, "none")) {
 372                         myself->digest = NULL;
 373                 } else {
 374                         myself->digest = EVP_get_digestbyname(digest);
 375
 376                         if(!myself->digest) {
 377                                 logger(LOG_ERR, _("Unrecognized digest type!"));
 378                                 return false;
 379                         }
 380                 }
 381         } else
 382                 myself->digest = EVP_sha1();
 383
 384         myself->connection->outdigest = EVP_sha1();
 385
 386         if(get_config_int
 387            (lookup_config(myself->connection->config_tree, "MACLength"),
 388                 &myself->maclength)) {
 389                 if(myself->digest) {
 390                         if(myself->maclength > myself->digest->md_size) {
 391                                 logger(LOG_ERR, _("MAC length exceeds size of digest!"));
 392                                 return false;
 393                         } else if(myself->maclength < 0) {
 394                                 logger(LOG_ERR, _("Bogus MAC length!"));
 395                                 return false;
 396                         }
 397                 }
 398         } else
 399                 myself->maclength = 4;
 400
 401         myself->connection->outmaclength = 0;
 402
 403         /* Compression */
 404
 405         if(get_config_int
 406            (lookup_config(myself->connection->config_tree, "Compression"),
 407                 &myself->compression)) {
 408                 if(myself->compression < 0 || myself->compression > 11) {
 409                         logger(LOG_ERR, _("Bogus compression level!"));
 410                         return false;
 411                 }
 412         } else
 413                 myself->compression = 0;
 414
 415         myself->connection->outcompression = 0;
 416
 417         /* Done */
 418
 419         myself->nexthop = myself;
 420         myself->via = myself;
 421         myself->status.active = true;
 422         myself->status.reachable = true;
 423         node_add(myself);
 424
 425         graph();
 426
 427         /* Open sockets */
 428
 429         memset(&hint, 0, sizeof(hint));
 430
 431         get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
 432
 433         hint.ai_family = addressfamily;
 434         hint.ai_socktype = SOCK_STREAM;
 435         hint.ai_protocol = IPPROTO_TCP;
 436         hint.ai_flags = AI_PASSIVE;
 437
 438         err = getaddrinfo(address, myport, &hint, &ai);
 439
 440         if(err || !ai) {
 441                 logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
 442                            gai_strerror(err));
 443                 return false;
 444         }
 445
 446         listen_sockets = 0;
 447
 448         for(aip = ai; aip; aip = aip->ai_next) {
 449                 listen_socket[listen_sockets].tcp =
 450                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 451
 452                 if(listen_socket[listen_sockets].tcp < 0)
 453                         continue;
 454
 455                 listen_socket[listen_sockets].udp =
 456                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 457
 458                 if(listen_socket[listen_sockets].udp < 0)
 459                         continue;
 460
 461                 ifdebug(CONNECTIONS) {
 462                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 463                         logger(LOG_NOTICE, _("Listening on %s"), hostname);
 464                         free(hostname);
 465                 }
 466
 467                 listen_socket[listen_sockets].sa.sa = *aip->ai_addr;
 468                 listen_sockets++;
 469         }
 470
 471         freeaddrinfo(ai);
 472
 473         if(listen_sockets)
 474                 logger(LOG_NOTICE, _("Ready"));
 475         else {
 476                 logger(LOG_ERR, _("Unable to create any listening socket!"));
 477                 return false;
 478         }
 479
 480         return true;
 481 }
 482
 483 /*
 484   setup all initial network connections
 485 */
 486 bool setup_network_connections(void)
 487 {
 488         char *envp[5];
 489         int i;
 490
 491         cp();
 492
 493         now = time(NULL);
 494
 495         init_connections();
 496         init_subnets();
 497         init_nodes();
 498         init_edges();
 499         init_events();
 500         init_requests();
 501
 502         if(get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) {
 503                 if(pingtimeout < 1) {
 504                         pingtimeout = 86400;
 505                 }
 506         } else
 507                 pingtimeout = 60;
 508
 509         if(!setup_device())
 510                 return false;
 511
 512         if(!setup_myself())
 513                 return false;
 514
 515         /* Run tinc-up script to further initialize the tap interface */
 516         asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 517         asprintf(&envp[1], "DEVICE=%s", device ? : "");
 518         asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 519         asprintf(&envp[3], "NAME=%s", myself->name);
 520         envp[4] = NULL;
 521
 522         execute_script("tinc-up", envp);
 523
 524         for(i = 0; i < 5; i++)
 525                 free(envp[i]);
 526
 527         try_outgoing_connections();
 528
 529         return true;
 530 }
 531
 532 /*
 533   close all open network connections
 534 */
 535 void close_network_connections(void)
 536 {
 537         avl_node_t *node, *next;
 538         connection_t *c;
 539         char *envp[5];
 540         int i;
 541
 542         cp();
 543
 544         for(node = connection_tree->head; node; node = next) {
 545                 next = node->next;
 546                 c = (connection_t *) node->data;
 547
 548                 if(c->outgoing)
 549                         free(c->outgoing->name), free(c->outgoing), c->outgoing = NULL;
 550                 terminate_connection(c, false);
 551         }
 552
 553         if(myself && myself->connection)
 554                 terminate_connection(myself->connection, false);
 555
 556         for(i = 0; i < listen_sockets; i++) {
 557                 close(listen_socket[i].tcp);
 558                 close(listen_socket[i].udp);
 559         }
 560
 561         exit_requests();
 562         exit_events();
 563         exit_edges();
 564         exit_subnets();
 565         exit_nodes();
 566         exit_connections();
 567
 568         asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 569         asprintf(&envp[1], "DEVICE=%s", device ? : "");
 570         asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 571         asprintf(&envp[3], "NAME=%s", myself->name);
 572         envp[4] = NULL;
 573
 574         execute_script("tinc-down", envp);
 575
 576         for(i = 0; i < 4; i++)
 577                 free(envp[i]);
 578
 579         close_device();
 580
 581         return;
 582 }