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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2016 Guus Sliepen <guus@tinc-vpn.org>
   5                   2006      Scott Lamb <slamb@slamb.org>
   6                   2010      Brandon Black <blblack@gmail.com>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License along
  19     with this program; if not, write to the Free Software Foundation, Inc.,
  20     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  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 "proxy.h"
  43 #include "route.h"
  44 #include "subnet.h"
  45 #include "utils.h"
  46 #include "xalloc.h"
  47
  48 char *myport;
  49 devops_t devops;
  50
  51 #ifndef HAVE_RSA_SET0_KEY
  52 int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d) {
  53         BN_free(r->n); r->n = n;
  54         BN_free(r->e); r->e = e;
  55         BN_free(r->d); r->d = d;
  56         return 1;
  57 }
  58 #endif
  59
  60 bool read_rsa_public_key(connection_t *c) {
  61         FILE *fp;
  62         char *pubname;
  63         char *hcfname;
  64         char *key;
  65         BIGNUM *n = NULL;
  66         BIGNUM *e = NULL;
  67
  68         if(!c->rsa_key) {
  69                 c->rsa_key = RSA_new();
  70 //              RSA_blinding_on(c->rsa_key, NULL);
  71         }
  72
  73         /* First, check for simple PublicKey statement */
  74
  75         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
  76                 if(BN_hex2bn(&n, key) != strlen(key)) {
  77                         free(key);
  78                         logger(LOG_ERR, "Invalid PublicKey for %s!", c->name);
  79                         return false;
  80                 }
  81                 free(key);
  82                 BN_hex2bn(&e, "FFFF");
  83                 if(!n || !e || RSA_set0_key(c->rsa_key, n, e, NULL) != 1) {
  84                         BN_free(e);
  85                         BN_free(n);
  86                         logger(LOG_ERR, "RSA_set0_key() failed with PublicKey for %s!", c->name);
  87                         return false;
  88                 }
  89                 return true;
  90         }
  91
  92         /* Else, check for PublicKeyFile statement and read it */
  93
  94         if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &pubname)) {
  95                 fp = fopen(pubname, "r");
  96
  97                 if(!fp) {
  98                         logger(LOG_ERR, "Error reading RSA public key file `%s': %s", pubname, strerror(errno));
  99                         free(pubname);
 100                         return false;
 101                 }
 102
 103                 c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
 104                 fclose(fp);
 105
 106                 if(c->rsa_key) {
 107                         free(pubname);
 108                         return true;            /* Woohoo. */
 109                 }
 110
 111                 /* If it fails, try PEM_read_RSA_PUBKEY. */
 112                 fp = fopen(pubname, "r");
 113
 114                 if(!fp) {
 115                         logger(LOG_ERR, "Error reading RSA public key file `%s': %s", pubname, strerror(errno));
 116                         free(pubname);
 117                         return false;
 118                 }
 119
 120                 c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
 121                 fclose(fp);
 122
 123                 if(c->rsa_key) {
 124 //                              RSA_blinding_on(c->rsa_key, NULL);
 125                         free(pubname);
 126                         return true;
 127                 }
 128
 129                 logger(LOG_ERR, "Reading RSA public key file `%s' failed: %s", pubname, strerror(errno));
 130                 free(pubname);
 131                 return false;
 132         }
 133
 134         /* Else, check if a harnessed public key is in the config file */
 135
 136         xasprintf(&hcfname, "%s/hosts/%s", confbase, c->name);
 137         fp = fopen(hcfname, "r");
 138
 139         if(!fp) {
 140                 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", hcfname, strerror(errno));
 141                 free(hcfname);
 142                 return false;
 143         }
 144
 145         c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
 146         fclose(fp);
 147
 148         if(c->rsa_key) {
 149                 free(hcfname);
 150                 return true;
 151         }
 152
 153         /* Try again with PEM_read_RSA_PUBKEY. */
 154
 155         fp = fopen(hcfname, "r");
 156
 157         if(!fp) {
 158                 logger(LOG_ERR, "Error reading RSA public key file `%s': %s", hcfname, strerror(errno));
 159                 free(hcfname);
 160                 return false;
 161         }
 162
 163         free(hcfname);
 164         c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
 165 //      RSA_blinding_on(c->rsa_key, NULL);
 166         fclose(fp);
 167
 168         if(c->rsa_key)
 169                 return true;
 170
 171         logger(LOG_ERR, "No public key for %s specified!", c->name);
 172
 173         return false;
 174 }
 175
 176 static bool read_rsa_private_key(void) {
 177         FILE *fp;
 178         char *fname, *key, *pubkey;
 179         BIGNUM *n = NULL;
 180         BIGNUM *e = NULL;
 181         BIGNUM *d = NULL;
 182
 183         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
 184                 myself->connection->rsa_key = RSA_new();
 185 //              RSA_blinding_on(myself->connection->rsa_key, NULL);
 186                 if(BN_hex2bn(&d, key) != strlen(key)) {
 187                         logger(LOG_ERR, "Invalid PrivateKey for myself!");
 188                         free(key);
 189                         return false;
 190                 }
 191                 free(key);
 192                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &pubkey)) {
 193                         BN_free(d);
 194                         logger(LOG_ERR, "PrivateKey used but no PublicKey found!");
 195                         return false;
 196                 }
 197                 if(BN_hex2bn(&n, pubkey) != strlen(pubkey)) {
 198                         free(pubkey);
 199                         BN_free(d);
 200                         logger(LOG_ERR, "Invalid PublicKey for myself!");
 201                         return false;
 202                 }
 203                 free(pubkey);
 204                 BN_hex2bn(&e, "FFFF");
 205                 if(!n || !e || !d || RSA_set0_key(myself->connection->rsa_key, n, e, d) != 1) {
 206                         BN_free(d);
 207                         BN_free(e);
 208                         BN_free(n);
 209                         logger(LOG_ERR, "RSA_set0_key() failed with PrivateKey for myself!");
 210                         return false;
 211                 }
 212                 return true;
 213         }
 214
 215         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 216                 xasprintf(&fname, "%s/rsa_key.priv", confbase);
 217
 218         fp = fopen(fname, "r");
 219
 220         if(!fp) {
 221                 logger(LOG_ERR, "Error reading RSA private key file `%s': %s",
 222                            fname, strerror(errno));
 223                 free(fname);
 224                 return false;
 225         }
 226
 227 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 228         struct stat s;
 229
 230         if(!fstat(fileno(fp), &s)) {
 231                 if(s.st_mode & ~0100700)
 232                         logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 233         } else {
 234                 logger(LOG_WARNING, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 235         }
 236 #endif
 237
 238         myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
 239         fclose(fp);
 240
 241         if(!myself->connection->rsa_key) {
 242                 logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s",
 243                            fname, strerror(errno));
 244                 free(fname);
 245                 return false;
 246         }
 247
 248         free(fname);
 249         return true;
 250 }
 251
 252 /*
 253   Read Subnets from all host config files
 254 */
 255 void load_all_subnets(void) {
 256         DIR *dir;
 257         struct dirent *ent;
 258         char *dname;
 259         char *fname;
 260         avl_tree_t *config_tree;
 261         config_t *cfg;
 262         subnet_t *s, *s2;
 263         node_t *n;
 264
 265         xasprintf(&dname, "%s/hosts", confbase);
 266         dir = opendir(dname);
 267         if(!dir) {
 268                 logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 269                 free(dname);
 270                 return;
 271         }
 272
 273         while((ent = readdir(dir))) {
 274                 if(!check_id(ent->d_name))
 275                         continue;
 276
 277                 n = lookup_node(ent->d_name);
 278                 #ifdef _DIRENT_HAVE_D_TYPE
 279                 //if(ent->d_type != DT_REG)
 280                 //      continue;
 281                 #endif
 282
 283                 xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
 284                 init_configuration(&config_tree);
 285                 read_config_options(config_tree, ent->d_name);
 286                 read_config_file(config_tree, fname);
 287                 free(fname);
 288
 289                 if(!n) {
 290                         n = new_node();
 291                         n->name = xstrdup(ent->d_name);
 292                         node_add(n);
 293                 }
 294
 295                 for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 296                         if(!get_config_subnet(cfg, &s))
 297                                 continue;
 298
 299                         if((s2 = lookup_subnet(n, s))) {
 300                                 s2->expires = -1;
 301                         } else {
 302                                 subnet_add(n, s);
 303                         }
 304                 }
 305
 306                 exit_configuration(&config_tree);
 307         }
 308
 309         closedir(dir);
 310 }
 311
 312 char *get_name(void) {
 313         char *name = NULL;
 314
 315         get_config_string(lookup_config(config_tree, "Name"), &name);
 316
 317         if(!name)
 318                 return NULL;
 319
 320         if(*name == '$') {
 321                 char *envname = getenv(name + 1);
 322                 char hostname[32] = "";
 323                 if(!envname) {
 324                         if(strcmp(name + 1, "HOST")) {
 325                                 fprintf(stderr, "Invalid Name: environment variable %s does not exist\n", name + 1);
 326                                 free(name);
 327                                 return false;
 328                         }
 329                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
 330                                 fprintf(stderr, "Could not get hostname: %s\n", strerror(errno));
 331                                 free(name);
 332                                 return false;
 333                         }
 334                         hostname[31] = 0;
 335                         envname = hostname;
 336                 }
 337                 free(name);
 338                 name = xstrdup(envname);
 339                 for(char *c = name; *c; c++)
 340                         if(!isalnum(*c))
 341                                 *c = '_';
 342         }
 343
 344         if(!check_id(name)) {
 345                 logger(LOG_ERR, "Invalid name for myself!");
 346                 free(name);
 347                 return false;
 348         }
 349
 350         return name;
 351 }
 352
 353 /*
 354   Configure node_t myself and set up the local sockets (listen only)
 355 */
 356 static bool setup_myself(void) {
 357         config_t *cfg;
 358         subnet_t *subnet;
 359         char *name, *hostname, *mode, *afname, *cipher, *digest, *type;
 360         char *fname = NULL;
 361         char *address = NULL;
 362         char *proxy = NULL;
 363         char *space;
 364         char *envp[5] = {NULL};
 365         struct addrinfo *ai, *aip, hint = {0};
 366         bool choice;
 367         int i, err;
 368         int replaywin_int;
 369         bool port_specified = false;
 370
 371         myself = new_node();
 372         myself->connection = new_connection();
 373
 374         myself->hostname = xstrdup("MYSELF");
 375         myself->connection->hostname = xstrdup("MYSELF");
 376
 377         myself->connection->options = 0;
 378         myself->connection->protocol_version = PROT_CURRENT;
 379
 380         if(!(name = get_name())) {
 381                 logger(LOG_ERR, "Name for tinc daemon required!");
 382                 return false;
 383         }
 384
 385         /* Read tinc.conf and our own host config file */
 386
 387         myself->name = name;
 388         myself->connection->name = xstrdup(name);
 389         xasprintf(&fname, "%s/hosts/%s", confbase, name);
 390         read_config_options(config_tree, name);
 391         read_config_file(config_tree, fname);
 392         free(fname);
 393
 394         if(!read_rsa_private_key())
 395                 return false;
 396
 397         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 398                 myport = xstrdup("655");
 399         else
 400                 port_specified = true;
 401
 402         /* Ensure myport is numeric */
 403
 404         if(!atoi(myport)) {
 405                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 406                 sockaddr_t sa;
 407                 if(!ai || !ai->ai_addr)
 408                         return false;
 409                 free(myport);
 410                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 411                 sockaddr2str(&sa, NULL, &myport);
 412         }
 413
 414         if(get_config_string(lookup_config(config_tree, "Proxy"), &proxy)) {
 415                 if((space = strchr(proxy, ' ')))
 416                         *space++ = 0;
 417
 418                 if(!strcasecmp(proxy, "none")) {
 419                         proxytype = PROXY_NONE;
 420                 } else if(!strcasecmp(proxy, "socks4")) {
 421                         proxytype = PROXY_SOCKS4;
 422                 } else if(!strcasecmp(proxy, "socks4a")) {
 423                         proxytype = PROXY_SOCKS4A;
 424                 } else if(!strcasecmp(proxy, "socks5")) {
 425                         proxytype = PROXY_SOCKS5;
 426                 } else if(!strcasecmp(proxy, "http")) {
 427                         proxytype = PROXY_HTTP;
 428                 } else if(!strcasecmp(proxy, "exec")) {
 429                         proxytype = PROXY_EXEC;
 430                 } else {
 431                         logger(LOG_ERR, "Unknown proxy type %s!", proxy);
 432                         free(proxy);
 433                         return false;
 434                 }
 435
 436                 switch(proxytype) {
 437                         case PROXY_NONE:
 438                         default:
 439                                 break;
 440
 441                         case PROXY_EXEC:
 442                                 if(!space || !*space) {
 443                                         logger(LOG_ERR, "Argument expected for proxy type exec!");
 444                                         free(proxy);
 445                                         return false;
 446                                 }
 447                                 proxyhost =  xstrdup(space);
 448                                 break;
 449
 450                         case PROXY_SOCKS4:
 451                         case PROXY_SOCKS4A:
 452                         case PROXY_SOCKS5:
 453                         case PROXY_HTTP:
 454                                 proxyhost = space;
 455                                 if(space && (space = strchr(space, ' ')))
 456                                         *space++ = 0, proxyport = space;
 457                                 if(space && (space = strchr(space, ' ')))
 458                                         *space++ = 0, proxyuser = space;
 459                                 if(space && (space = strchr(space, ' ')))
 460                                         *space++ = 0, proxypass = space;
 461                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 462                                         logger(LOG_ERR, "Host and port argument expected for proxy!");
 463                                         free(proxy);
 464                                         return false;
 465                                 }
 466                                 proxyhost = xstrdup(proxyhost);
 467                                 proxyport = xstrdup(proxyport);
 468                                 if(proxyuser && *proxyuser)
 469                                         proxyuser = xstrdup(proxyuser);
 470                                 if(proxypass && *proxypass)
 471                                         proxypass = xstrdup(proxypass);
 472                                 break;
 473                 }
 474
 475                 free(proxy);
 476         }
 477
 478         /* Read in all the subnets specified in the host configuration file */
 479
 480         cfg = lookup_config(config_tree, "Subnet");
 481
 482         while(cfg) {
 483                 if(!get_config_subnet(cfg, &subnet))
 484                         return false;
 485
 486                 subnet_add(myself, subnet);
 487
 488                 cfg = lookup_config_next(config_tree, cfg);
 489         }
 490
 491         /* Check some options */
 492
 493         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 494                 myself->options |= OPTION_INDIRECT;
 495
 496         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 497                 myself->options |= OPTION_TCPONLY;
 498
 499         if(myself->options & OPTION_TCPONLY)
 500                 myself->options |= OPTION_INDIRECT;
 501
 502         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 503         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 504         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 505         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 506         strictsubnets |= tunnelserver;
 507
 508         if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 509                 if(!strcasecmp(mode, "router"))
 510                         routing_mode = RMODE_ROUTER;
 511                 else if(!strcasecmp(mode, "switch"))
 512                         routing_mode = RMODE_SWITCH;
 513                 else if(!strcasecmp(mode, "hub"))
 514                         routing_mode = RMODE_HUB;
 515                 else {
 516                         logger(LOG_ERR, "Invalid routing mode!");
 517                         free(mode);
 518                         return false;
 519                 }
 520                 free(mode);
 521         }
 522
 523         if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
 524                 if(!strcasecmp(mode, "off"))
 525                         forwarding_mode = FMODE_OFF;
 526                 else if(!strcasecmp(mode, "internal"))
 527                         forwarding_mode = FMODE_INTERNAL;
 528                 else if(!strcasecmp(mode, "kernel"))
 529                         forwarding_mode = FMODE_KERNEL;
 530                 else {
 531                         logger(LOG_ERR, "Invalid forwarding mode!");
 532                         free(mode);
 533                         return false;
 534                 }
 535                 free(mode);
 536         }
 537
 538         choice = true;
 539         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 540         if(choice)
 541                 myself->options |= OPTION_PMTU_DISCOVERY;
 542
 543         choice = true;
 544         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 545         if(choice)
 546                 myself->options |= OPTION_CLAMP_MSS;
 547
 548         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 549         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 550         if(get_config_string(lookup_config(config_tree, "Broadcast"), &mode)) {
 551                 if(!strcasecmp(mode, "no"))
 552                         broadcast_mode = BMODE_NONE;
 553                 else if(!strcasecmp(mode, "yes") || !strcasecmp(mode, "mst"))
 554                         broadcast_mode = BMODE_MST;
 555                 else if(!strcasecmp(mode, "direct"))
 556                         broadcast_mode = BMODE_DIRECT;
 557                 else {
 558                         logger(LOG_ERR, "Invalid broadcast mode!");
 559                         free(mode);
 560                         return false;
 561                 }
 562                 free(mode);
 563         }
 564
 565 #if !defined(SOL_IP) || !defined(IP_TOS)
 566         if(priorityinheritance)
 567                 logger(LOG_WARNING, "%s not supported on this platform for IPv4 connection", "PriorityInheritance");
 568 #endif
 569
 570 #if !defined(IPPROTO_IPV6) || !defined(IPV6_TCLASS)
 571         if(priorityinheritance)
 572                 logger(LOG_WARNING, "%s not supported on this platform for IPv6 connection", "PriorityInheritance");
 573 #endif
 574
 575         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 576                 macexpire = 600;
 577
 578         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 579                 if(maxtimeout <= 0) {
 580                         logger(LOG_ERR, "Bogus maximum timeout!");
 581                         return false;
 582                 }
 583         } else
 584                 maxtimeout = 900;
 585
 586         if(get_config_int(lookup_config(config_tree, "MinTimeout"), &mintimeout)) {
 587                         if(mintimeout < 0) {
 588                                 logger(LOG_ERR, "Bogus minimum timeout!");
 589                                 return false;
 590                         }
 591                         if(mintimeout > maxtimeout) {
 592                                 logger(LOG_WARNING, "Minimum timeout (%d s) cannot be larger than maximum timeout (%d s). Correcting !", mintimeout, maxtimeout );
 593                                 mintimeout=maxtimeout;
 594                         }
 595                 } else
 596                         mintimeout = 0;
 597
 598         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 599                 if(udp_rcvbuf <= 0) {
 600                         logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
 601                         return false;
 602                 }
 603         }
 604
 605         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 606                 if(udp_sndbuf <= 0) {
 607                         logger(LOG_ERR, "UDPSndBuf cannot be negative!");
 608                         return false;
 609                 }
 610         }
 611
 612         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 613                 if(replaywin_int < 0) {
 614                         logger(LOG_ERR, "ReplayWindow cannot be negative!");
 615                         return false;
 616                 }
 617                 replaywin = (unsigned)replaywin_int;
 618         }
 619
 620         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 621                 if(!strcasecmp(afname, "IPv4"))
 622                         addressfamily = AF_INET;
 623                 else if(!strcasecmp(afname, "IPv6"))
 624                         addressfamily = AF_INET6;
 625                 else if(!strcasecmp(afname, "any"))
 626                         addressfamily = AF_UNSPEC;
 627                 else {
 628                         logger(LOG_ERR, "Invalid address family!");
 629                         free(afname);
 630                         return false;
 631                 }
 632                 free(afname);
 633         }
 634
 635         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 636
 637         /* Generate packet encryption key */
 638
 639         if(get_config_string(lookup_config(config_tree, "Cipher"), &cipher)) {
 640                 if(!strcasecmp(cipher, "none")) {
 641                         myself->incipher = NULL;
 642                 } else {
 643                         myself->incipher = EVP_get_cipherbyname(cipher);
 644
 645                         if(!myself->incipher) {
 646                                 logger(LOG_ERR, "Unrecognized cipher type!");
 647                                 free(cipher);
 648                                 return false;
 649                         }
 650                 }
 651                 free(cipher);
 652         } else
 653                 myself->incipher = EVP_aes_256_cbc();
 654
 655         if(myself->incipher)
 656                 myself->inkeylength = EVP_CIPHER_key_length(myself->incipher) + EVP_CIPHER_iv_length(myself->incipher);
 657         else
 658                 myself->inkeylength = 1;
 659
 660         /* We need to use a stream mode for the meta protocol. Use AES for this,
 661            but try to match the key size with the one from the cipher selected
 662            by Cipher.
 663         */
 664
 665         int keylen = EVP_CIPHER_key_length(myself->incipher);
 666         if(keylen <= 16)
 667                 myself->connection->outcipher = EVP_aes_128_cfb();
 668         else if(keylen <= 24)
 669                 myself->connection->outcipher = EVP_aes_192_cfb();
 670         else
 671                 myself->connection->outcipher = EVP_aes_256_cfb();
 672
 673         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 674                 keylifetime = 3600;
 675
 676         keyexpires = now + keylifetime;
 677
 678         /* Check if we want to use message authentication codes... */
 679
 680         if(get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
 681                 if(!strcasecmp(digest, "none")) {
 682                         myself->indigest = NULL;
 683                 } else {
 684                         myself->indigest = EVP_get_digestbyname(digest);
 685
 686                         if(!myself->indigest) {
 687                                 logger(LOG_ERR, "Unrecognized digest type!");
 688                                 free(digest);
 689                                 return false;
 690                         }
 691                 }
 692
 693                 free(digest);
 694         } else
 695                 myself->indigest = EVP_sha256();
 696
 697         myself->connection->outdigest = EVP_sha256();
 698
 699         if(get_config_int(lookup_config(config_tree, "MACLength"), &myself->inmaclength)) {
 700                 if(myself->indigest) {
 701                         if(myself->inmaclength > EVP_MD_size(myself->indigest)) {
 702                                 logger(LOG_ERR, "MAC length exceeds size of digest!");
 703                                 return false;
 704                         } else if(myself->inmaclength < 0) {
 705                                 logger(LOG_ERR, "Bogus MAC length!");
 706                                 return false;
 707                         }
 708                 }
 709         } else
 710                 myself->inmaclength = 4;
 711
 712         myself->connection->outmaclength = 0;
 713
 714         /* Compression */
 715
 716         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 717                 if(myself->incompression < 0 || myself->incompression > 11) {
 718                         logger(LOG_ERR, "Bogus compression level!");
 719                         return false;
 720                 }
 721         } else
 722                 myself->incompression = 0;
 723
 724         myself->connection->outcompression = 0;
 725
 726         /* Done */
 727
 728         myself->nexthop = myself;
 729         myself->via = myself;
 730         myself->status.reachable = true;
 731         node_add(myself);
 732
 733         graph();
 734
 735         if(strictsubnets)
 736                 load_all_subnets();
 737
 738         /* Open device */
 739
 740         devops = os_devops;
 741
 742         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 743                 if(!strcasecmp(type, "dummy"))
 744                         devops = dummy_devops;
 745                 else if(!strcasecmp(type, "raw_socket"))
 746                         devops = raw_socket_devops;
 747                 else if(!strcasecmp(type, "multicast"))
 748                         devops = multicast_devops;
 749 #ifdef ENABLE_UML
 750                 else if(!strcasecmp(type, "uml"))
 751                         devops = uml_devops;
 752 #endif
 753 #ifdef ENABLE_VDE
 754                 else if(!strcasecmp(type, "vde"))
 755                         devops = vde_devops;
 756 #endif
 757                 free(type);
 758         }
 759
 760         if(!devops.setup())
 761                 return false;
 762
 763         /* Run tinc-up script to further initialize the tap interface */
 764         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 765         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 766         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 767         xasprintf(&envp[3], "NAME=%s", myself->name);
 768
 769 #ifdef HAVE_MINGW
 770         Sleep(1000);
 771 #endif
 772 #ifdef HAVE_CYGWIN
 773         sleep(1);
 774 #endif
 775         execute_script("tinc-up", envp);
 776
 777         for(i = 0; i < 4; i++)
 778                 free(envp[i]);
 779
 780         /* Run subnet-up scripts for our own subnets */
 781
 782         subnet_update(myself, NULL, true);
 783
 784         /* Open sockets */
 785
 786         if(!do_detach && getenv("LISTEN_FDS")) {
 787                 sockaddr_t sa;
 788                 socklen_t salen;
 789
 790                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 791 #ifdef HAVE_UNSETENV
 792                 unsetenv("LISTEN_FDS");
 793 #endif
 794
 795                 if(listen_sockets > MAXSOCKETS) {
 796                         logger(LOG_ERR, "Too many listening sockets");
 797                         return false;
 798                 }
 799
 800                 for(i = 0; i < listen_sockets; i++) {
 801                         salen = sizeof sa;
 802                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 803                                 logger(LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 804                                 return false;
 805                         }
 806
 807                         listen_socket[i].tcp = i + 3;
 808
 809 #ifdef FD_CLOEXEC
 810                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 811 #endif
 812
 813                         listen_socket[i].udp = setup_vpn_in_socket(&sa);
 814                         if(listen_socket[i].udp < 0)
 815                                 return false;
 816
 817                         ifdebug(CONNECTIONS) {
 818                                 hostname = sockaddr2hostname(&sa);
 819                                 logger(LOG_NOTICE, "Listening on %s", hostname);
 820                                 free(hostname);
 821                         }
 822
 823                         memcpy(&listen_socket[i].sa, &sa, salen);
 824                 }
 825         } else {
 826                 listen_sockets = 0;
 827                 cfg = lookup_config(config_tree, "BindToAddress");
 828
 829                 do {
 830                         get_config_string(cfg, &address);
 831                         if(cfg)
 832                                 cfg = lookup_config_next(config_tree, cfg);
 833
 834                         char *port = myport;
 835
 836                         if(address) {
 837                                 char *space = strchr(address, ' ');
 838                                 if(space) {
 839                                         *space++ = 0;
 840                                         port = space;
 841                                 }
 842
 843                                 if(!strcmp(address, "*"))
 844                                         *address = 0;
 845                         }
 846
 847                         hint.ai_family = addressfamily;
 848                         hint.ai_socktype = SOCK_STREAM;
 849                         hint.ai_protocol = IPPROTO_TCP;
 850                         hint.ai_flags = AI_PASSIVE;
 851
 852 #if HAVE_DECL_RES_INIT
 853                         // ensure glibc reloads /etc/resolv.conf.
 854                         res_init();
 855 #endif
 856                         err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 857                         free(address);
 858
 859                         if(err || !ai) {
 860                                 logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 861                                            gai_strerror(err));
 862                                 return false;
 863                         }
 864
 865                         for(aip = ai; aip; aip = aip->ai_next) {
 866                                 if(listen_sockets >= MAXSOCKETS) {
 867                                         logger(LOG_ERR, "Too many listening sockets");
 868                                         return false;
 869                                 }
 870
 871                                 listen_socket[listen_sockets].tcp =
 872                                         setup_listen_socket((sockaddr_t *) aip->ai_addr);
 873
 874                                 if(listen_socket[listen_sockets].tcp < 0)
 875                                         continue;
 876
 877                                 listen_socket[listen_sockets].udp =
 878                                         setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 879
 880                                 if(listen_socket[listen_sockets].udp < 0)
 881                                         continue;
 882
 883                                 ifdebug(CONNECTIONS) {
 884                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 885                                         logger(LOG_NOTICE, "Listening on %s", hostname);
 886                                         free(hostname);
 887                                 }
 888
 889                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 890                                 listen_sockets++;
 891                         }
 892
 893                         freeaddrinfo(ai);
 894                 } while(cfg);
 895         }
 896
 897         if(!listen_sockets) {
 898                 logger(LOG_ERR, "Unable to create any listening socket!");
 899                 return false;
 900         }
 901
 902         /* If no Port option was specified, set myport to the port used by the first listening socket. */
 903
 904         if(!port_specified) {
 905                 sockaddr_t sa;
 906                 socklen_t salen = sizeof sa;
 907                 if(!getsockname(listen_socket[0].udp, &sa.sa, &salen)) {
 908                         free(myport);
 909                         sockaddr2str(&sa, NULL, &myport);
 910                         if(!myport)
 911                                 myport = xstrdup("655");
 912                 }
 913         }
 914
 915         /* Done. */
 916
 917         logger(LOG_NOTICE, "Ready");
 918         return true;
 919 }
 920
 921 /*
 922   initialize network
 923 */
 924 bool setup_network(void) {
 925         now = time(NULL);
 926
 927         init_events();
 928         init_connections();
 929         init_subnets();
 930         init_nodes();
 931         init_edges();
 932         init_requests();
 933
 934         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 935                 if(pinginterval < 1) {
 936                         pinginterval = 86400;
 937                 }
 938         } else
 939                 pinginterval = 60;
 940
 941         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 942                 pingtimeout = 5;
 943         if(pingtimeout < 1 || pingtimeout > pinginterval)
 944                 pingtimeout = pinginterval;
 945
 946         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 947                 maxoutbufsize = 10 * MTU;
 948
 949         if(!setup_myself())
 950                 return false;
 951
 952         return true;
 953 }
 954
 955 /*
 956   close all open network connections
 957 */
 958 void close_network_connections(void) {
 959         avl_node_t *node, *next;
 960         connection_t *c;
 961         char *envp[5] = {NULL};
 962         int i;
 963
 964         for(node = connection_tree->head; node; node = next) {
 965                 next = node->next;
 966                 c = node->data;
 967                 c->outgoing = NULL;
 968                 terminate_connection(c, false);
 969         }
 970
 971         for(list_node_t *node = outgoing_list->head; node; node = node->next) {
 972                 outgoing_t *outgoing = node->data;
 973
 974                 if(outgoing->event)
 975                         event_del(outgoing->event);
 976         }
 977
 978         list_delete_list(outgoing_list);
 979
 980         if(myself && myself->connection) {
 981                 subnet_update(myself, NULL, false);
 982                 terminate_connection(myself->connection, false);
 983                 free_connection(myself->connection);
 984         }
 985
 986         for(i = 0; i < listen_sockets; i++) {
 987                 close(listen_socket[i].tcp);
 988                 close(listen_socket[i].udp);
 989         }
 990
 991         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 992         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 993         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 994         xasprintf(&envp[3], "NAME=%s", myself->name);
 995
 996         exit_requests();
 997         exit_edges();
 998         exit_subnets();
 999         exit_nodes();
1000         exit_connections();
1001         exit_events();
1002
1003         execute_script("tinc-down", envp);
1004
1005         if(myport) free(myport);
1006
1007         for(i = 0; i < 4; i++)
1008                 free(envp[i]);
1009
1010         devops.close();
1011
1012         return;
1013 }