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                   2000-2017 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 "cipher.h"
  26 #include "conf.h"
  27 #include "connection.h"
  28 #include "control.h"
  29 #include "device.h"
  30 #include "digest.h"
  31 #include "ecdsa.h"
  32 #include "graph.h"
  33 #include "logger.h"
  34 #include "names.h"
  35 #include "net.h"
  36 #include "netutl.h"
  37 #include "process.h"
  38 #include "protocol.h"
  39 #include "route.h"
  40 #include "rsa.h"
  41 #include "script.h"
  42 #include "subnet.h"
  43 #include "utils.h"
  44 #include "xalloc.h"
  45
  46 #ifdef HAVE_MINIUPNPC
  47 #include "upnp.h"
  48 #endif
  49
  50 char *myport;
  51 static io_t device_io;
  52 devops_t devops;
  53 bool device_standby = false;
  54
  55 char *proxyhost;
  56 char *proxyport;
  57 char *proxyuser;
  58 char *proxypass;
  59 proxytype_t proxytype;
  60 bool autoconnect;
  61 bool disablebuggypeers;
  62
  63 char *scriptinterpreter;
  64 char *scriptextension;
  65
  66 bool node_read_ecdsa_public_key(node_t *n) {
  67         if(ecdsa_active(n->ecdsa)) {
  68                 return true;
  69         }
  70
  71         splay_tree_t *config_tree;
  72         FILE *fp;
  73         char *pubname = NULL;
  74         char *p;
  75
  76         init_configuration(&config_tree);
  77
  78         if(!read_host_config(config_tree, n->name, true)) {
  79                 goto exit;
  80         }
  81
  82         /* First, check for simple Ed25519PublicKey statement */
  83
  84         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  85                 n->ecdsa = ecdsa_set_base64_public_key(p);
  86                 free(p);
  87                 goto exit;
  88         }
  89
  90         /* Else, check for Ed25519PublicKeyFile statement and read it */
  91
  92         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname)) {
  93                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  94         }
  95
  96         fp = fopen(pubname, "r");
  97
  98         if(!fp) {
  99                 goto exit;
 100         }
 101
 102         n->ecdsa = ecdsa_read_pem_public_key(fp);
 103         fclose(fp);
 104
 105 exit:
 106         exit_configuration(&config_tree);
 107         free(pubname);
 108         return n->ecdsa;
 109 }
 110
 111 bool read_ecdsa_public_key(connection_t *c) {
 112         if(ecdsa_active(c->ecdsa)) {
 113                 return true;
 114         }
 115
 116         FILE *fp;
 117         char *fname;
 118         char *p;
 119
 120         if(!c->config_tree) {
 121                 init_configuration(&c->config_tree);
 122
 123                 if(!read_host_config(c->config_tree, c->name, true)) {
 124                         return false;
 125                 }
 126         }
 127
 128         /* First, check for simple Ed25519PublicKey statement */
 129
 130         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 131                 c->ecdsa = ecdsa_set_base64_public_key(p);
 132                 free(p);
 133                 return c->ecdsa;
 134         }
 135
 136         /* Else, check for Ed25519PublicKeyFile statement and read it */
 137
 138         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname)) {
 139                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 140         }
 141
 142         fp = fopen(fname, "r");
 143
 144         if(!fp) {
 145                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
 146                        fname, strerror(errno));
 147                 free(fname);
 148                 return false;
 149         }
 150
 151         c->ecdsa = ecdsa_read_pem_public_key(fp);
 152
 153         if(!c->ecdsa && errno != ENOENT) {
 154                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 155         }
 156
 157         fclose(fp);
 158         free(fname);
 159         return c->ecdsa;
 160 }
 161
 162 #ifndef DISABLE_LEGACY
 163 bool read_rsa_public_key(connection_t *c) {
 164         FILE *fp;
 165         char *fname;
 166         char *n;
 167
 168         /* First, check for simple PublicKey statement */
 169
 170         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 171                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 172                 free(n);
 173                 return c->rsa;
 174         }
 175
 176         /* Else, check for PublicKeyFile statement and read it */
 177
 178         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
 179                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 180         }
 181
 182         fp = fopen(fname, "r");
 183
 184         if(!fp) {
 185                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 186                 free(fname);
 187                 return false;
 188         }
 189
 190         c->rsa = rsa_read_pem_public_key(fp);
 191         fclose(fp);
 192
 193         if(!c->rsa) {
 194                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 195         }
 196
 197         free(fname);
 198         return c->rsa;
 199 }
 200 #endif
 201
 202 static bool read_ecdsa_private_key(void) {
 203         FILE *fp;
 204         char *fname;
 205
 206         /* Check for PrivateKeyFile statement and read it */
 207
 208         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname)) {
 209                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 210         }
 211
 212         fp = fopen(fname, "r");
 213
 214         if(!fp) {
 215                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 216
 217                 if(errno == ENOENT) {
 218                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ? netname : ".");
 219                 }
 220
 221                 free(fname);
 222                 return false;
 223         }
 224
 225 #ifndef HAVE_MINGW
 226         struct stat s;
 227
 228         if(fstat(fileno(fp), &s)) {
 229                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 230                 free(fname);
 231                 return false;
 232         }
 233
 234         if(s.st_mode & ~0100700) {
 235                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 236         }
 237
 238 #endif
 239
 240         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 241         fclose(fp);
 242
 243         if(!myself->connection->ecdsa) {
 244                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 245         }
 246
 247         free(fname);
 248         return myself->connection->ecdsa;
 249 }
 250
 251 static bool read_invitation_key(void) {
 252         FILE *fp;
 253         char fname[PATH_MAX];
 254
 255         if(invitation_key) {
 256                 ecdsa_free(invitation_key);
 257                 invitation_key = NULL;
 258         }
 259
 260         snprintf(fname, sizeof(fname), "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 261
 262         fp = fopen(fname, "r");
 263
 264         if(fp) {
 265                 invitation_key = ecdsa_read_pem_private_key(fp);
 266                 fclose(fp);
 267
 268                 if(!invitation_key) {
 269                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 270                 }
 271         }
 272
 273         return invitation_key;
 274 }
 275
 276 #ifndef DISABLE_LEGACY
 277 static bool read_rsa_private_key(void) {
 278         FILE *fp;
 279         char *fname;
 280         char *n, *d;
 281
 282         /* First, check for simple PrivateKey statement */
 283
 284         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 285                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 286                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 287                         free(d);
 288                         return false;
 289                 }
 290
 291                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 292                 free(n);
 293                 free(d);
 294                 return myself->connection->rsa;
 295         }
 296
 297         /* Else, check for PrivateKeyFile statement and read it */
 298
 299         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname)) {
 300                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 301         }
 302
 303         fp = fopen(fname, "r");
 304
 305         if(!fp) {
 306                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 307                        fname, strerror(errno));
 308
 309                 if(errno == ENOENT) {
 310                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an RSA keypair with `tinc -n %s generate-rsa-keys'.", netname ? netname : ".");
 311                 }
 312
 313                 free(fname);
 314                 return false;
 315         }
 316
 317 #ifndef HAVE_MINGW
 318         struct stat s;
 319
 320         if(fstat(fileno(fp), &s)) {
 321                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 322                 free(fname);
 323                 return false;
 324         }
 325
 326         if(s.st_mode & ~0100700) {
 327                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 328         }
 329
 330 #endif
 331
 332         myself->connection->rsa = rsa_read_pem_private_key(fp);
 333         fclose(fp);
 334
 335         if(!myself->connection->rsa) {
 336                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 337         }
 338
 339         free(fname);
 340         return myself->connection->rsa;
 341 }
 342 #endif
 343
 344 #ifndef DISABLE_LEGACY
 345 static timeout_t keyexpire_timeout;
 346
 347 static void keyexpire_handler(void *data) {
 348         regenerate_key();
 349         timeout_set(data, &(struct timeval) {
 350                 keylifetime, rand() % 100000
 351         });
 352 }
 353 #endif
 354
 355 void regenerate_key(void) {
 356         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 357         send_key_changed();
 358
 359         for splay_each(node_t, n, node_tree) {
 360                 n->status.validkey_in = false;
 361         }
 362 }
 363
 364 void load_all_nodes(void) {
 365         DIR *dir;
 366         struct dirent *ent;
 367         char dname[PATH_MAX];
 368
 369         snprintf(dname, sizeof(dname), "%s" SLASH "hosts", confbase);
 370         dir = opendir(dname);
 371
 372         if(!dir) {
 373                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 374                 return;
 375         }
 376
 377         while((ent = readdir(dir))) {
 378                 if(!check_id(ent->d_name)) {
 379                         continue;
 380                 }
 381
 382                 node_t *n = lookup_node(ent->d_name);
 383
 384                 splay_tree_t *config_tree;
 385                 init_configuration(&config_tree);
 386                 read_config_options(config_tree, ent->d_name);
 387                 read_host_config(config_tree, ent->d_name, true);
 388
 389                 if(!n) {
 390                         n = new_node();
 391                         n->name = xstrdup(ent->d_name);
 392                         node_add(n);
 393                 }
 394
 395                 if(strictsubnets) {
 396                         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 397                                 subnet_t *s, *s2;
 398
 399                                 if(!get_config_subnet(cfg, &s)) {
 400                                         continue;
 401                                 }
 402
 403                                 if((s2 = lookup_subnet(n, s))) {
 404                                         s2->expires = -1;
 405                                         free(s);
 406                                 } else {
 407                                         subnet_add(n, s);
 408                                 }
 409                         }
 410                 }
 411
 412                 if(lookup_config(config_tree, "Address")) {
 413                         n->status.has_address = true;
 414                 }
 415
 416                 exit_configuration(&config_tree);
 417         }
 418
 419         closedir(dir);
 420 }
 421
 422 char *get_name(void) {
 423         char *name = NULL;
 424         char *returned_name;
 425
 426         get_config_string(lookup_config(config_tree, "Name"), &name);
 427
 428         if(!name) {
 429                 return NULL;
 430         }
 431
 432         returned_name = replace_name(name);
 433         free(name);
 434         return returned_name;
 435 }
 436
 437 bool setup_myself_reloadable(void) {
 438         char *proxy = NULL;
 439         char *rmode = NULL;
 440         char *fmode = NULL;
 441         char *bmode = NULL;
 442         char *afname = NULL;
 443         char *space;
 444         bool choice;
 445
 446         free(scriptinterpreter);
 447         scriptinterpreter = NULL;
 448         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 449
 450
 451         free(scriptextension);
 452
 453         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension)) {
 454                 scriptextension = xstrdup("");
 455         }
 456
 457         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 458
 459         if(proxy) {
 460                 if((space = strchr(proxy, ' '))) {
 461                         *space++ = 0;
 462                 }
 463
 464                 if(!strcasecmp(proxy, "none")) {
 465                         proxytype = PROXY_NONE;
 466                 } else if(!strcasecmp(proxy, "socks4")) {
 467                         proxytype = PROXY_SOCKS4;
 468                 } else if(!strcasecmp(proxy, "socks4a")) {
 469                         proxytype = PROXY_SOCKS4A;
 470                 } else if(!strcasecmp(proxy, "socks5")) {
 471                         proxytype = PROXY_SOCKS5;
 472                 } else if(!strcasecmp(proxy, "http")) {
 473                         proxytype = PROXY_HTTP;
 474                 } else if(!strcasecmp(proxy, "exec")) {
 475                         proxytype = PROXY_EXEC;
 476                 } else {
 477                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 478                         return false;
 479                 }
 480
 481                 switch(proxytype) {
 482                 case PROXY_NONE:
 483                 default:
 484                         break;
 485
 486                 case PROXY_EXEC:
 487                         if(!space || !*space) {
 488                                 logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 489                                 return false;
 490                         }
 491
 492                         proxyhost =  xstrdup(space);
 493                         break;
 494
 495                 case PROXY_SOCKS4:
 496                 case PROXY_SOCKS4A:
 497                 case PROXY_SOCKS5:
 498                 case PROXY_HTTP:
 499                         proxyhost = space;
 500
 501                         if(space && (space = strchr(space, ' '))) {
 502                                 *space++ = 0, proxyport = space;
 503                         }
 504
 505                         if(space && (space = strchr(space, ' '))) {
 506                                 *space++ = 0, proxyuser = space;
 507                         }
 508
 509                         if(space && (space = strchr(space, ' '))) {
 510                                 *space++ = 0, proxypass = space;
 511                         }
 512
 513                         if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 514                                 logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 515                                 return false;
 516                         }
 517
 518                         proxyhost = xstrdup(proxyhost);
 519                         proxyport = xstrdup(proxyport);
 520
 521                         if(proxyuser && *proxyuser) {
 522                                 proxyuser = xstrdup(proxyuser);
 523                         }
 524
 525                         if(proxypass && *proxypass) {
 526                                 proxypass = xstrdup(proxypass);
 527                         }
 528
 529                         break;
 530                 }
 531
 532                 free(proxy);
 533         }
 534
 535         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice) {
 536                 myself->options |= OPTION_INDIRECT;
 537         }
 538
 539         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice) {
 540                 myself->options |= OPTION_TCPONLY;
 541         }
 542
 543         if(myself->options & OPTION_TCPONLY) {
 544                 myself->options |= OPTION_INDIRECT;
 545         }
 546
 547         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
 548         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 549         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 550         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 551
 552         get_config_int(lookup_config(config_tree, "MTUInfoInterval"), &mtu_info_interval);
 553         get_config_int(lookup_config(config_tree, "UDPInfoInterval"), &udp_info_interval);
 554
 555         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 556         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 557
 558         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 559                 if(!strcasecmp(rmode, "router")) {
 560                         routing_mode = RMODE_ROUTER;
 561                 } else if(!strcasecmp(rmode, "switch")) {
 562                         routing_mode = RMODE_SWITCH;
 563                 } else if(!strcasecmp(rmode, "hub")) {
 564                         routing_mode = RMODE_HUB;
 565                 } else {
 566                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 567                         return false;
 568                 }
 569
 570                 free(rmode);
 571         }
 572
 573         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 574                 if(!strcasecmp(fmode, "off")) {
 575                         forwarding_mode = FMODE_OFF;
 576                 } else if(!strcasecmp(fmode, "internal")) {
 577                         forwarding_mode = FMODE_INTERNAL;
 578                 } else if(!strcasecmp(fmode, "kernel")) {
 579                         forwarding_mode = FMODE_KERNEL;
 580                 } else {
 581                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 582                         return false;
 583                 }
 584
 585                 free(fmode);
 586         }
 587
 588         choice = !(myself->options & OPTION_TCPONLY);
 589         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 590
 591         if(choice) {
 592                 myself->options |= OPTION_PMTU_DISCOVERY;
 593         }
 594
 595         choice = true;
 596         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 597
 598         if(choice) {
 599                 myself->options |= OPTION_CLAMP_MSS;
 600         }
 601
 602         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 603         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 604
 605         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 606                 if(!strcasecmp(bmode, "no")) {
 607                         broadcast_mode = BMODE_NONE;
 608                 } else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst")) {
 609                         broadcast_mode = BMODE_MST;
 610                 } else if(!strcasecmp(bmode, "direct")) {
 611                         broadcast_mode = BMODE_DIRECT;
 612                 } else {
 613                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 614                         return false;
 615                 }
 616
 617                 free(bmode);
 618         }
 619
 620         const char *const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 621
 622         for(size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 623                 subnet_t *s = new_subnet();
 624
 625                 if(!str2net(s, DEFAULT_BROADCAST_SUBNETS[i])) {
 626                         abort();
 627                 }
 628
 629                 subnet_add(NULL, s);
 630         }
 631
 632         for(config_t *cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 633                 subnet_t *s;
 634
 635                 if(!get_config_subnet(cfg, &s)) {
 636                         continue;
 637                 }
 638
 639                 subnet_add(NULL, s);
 640         }
 641
 642 #if !defined(IP_TOS)
 643
 644         if(priorityinheritance) {
 645                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv4 connections", "PriorityInheritance");
 646         }
 647
 648 #endif
 649
 650 #if !defined(IPV6_TCLASS)
 651
 652         if(priorityinheritance) {
 653                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv6 connections", "PriorityInheritance");
 654         }
 655
 656 #endif
 657
 658         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire)) {
 659                 macexpire = 600;
 660         }
 661
 662         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 663                 if(maxtimeout <= 0) {
 664                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 665                         return false;
 666                 }
 667         } else {
 668                 maxtimeout = 900;
 669         }
 670
 671         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 672                 if(!strcasecmp(afname, "IPv4")) {
 673                         addressfamily = AF_INET;
 674                 } else if(!strcasecmp(afname, "IPv6")) {
 675                         addressfamily = AF_INET6;
 676                 } else if(!strcasecmp(afname, "any")) {
 677                         addressfamily = AF_UNSPEC;
 678                 } else {
 679                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 680                         return false;
 681                 }
 682
 683                 free(afname);
 684         }
 685
 686         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 687
 688         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime)) {
 689                 keylifetime = 3600;
 690         }
 691
 692         if(!get_config_bool(lookup_config(config_tree, "AutoConnect"), &autoconnect)) {
 693                 autoconnect = true;
 694         }
 695
 696         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 697
 698         if(!get_config_int(lookup_config(config_tree, "InvitationExpire"), &invitation_lifetime)) {
 699                 invitation_lifetime = 604800;        // 1 week
 700         }
 701
 702         read_invitation_key();
 703
 704         return true;
 705 }
 706
 707 /*
 708   Add listening sockets.
 709 */
 710 static bool add_listen_address(char *address, bool bindto) {
 711         char *port = myport;
 712
 713         if(address) {
 714                 char *space = strchr(address, ' ');
 715
 716                 if(space) {
 717                         *space++ = 0;
 718                         port = space;
 719                 }
 720
 721                 if(!strcmp(address, "*")) {
 722                         *address = 0;
 723                 }
 724         }
 725
 726         struct addrinfo *ai, hint = {0};
 727
 728         hint.ai_family = addressfamily;
 729
 730         hint.ai_socktype = SOCK_STREAM;
 731
 732         hint.ai_protocol = IPPROTO_TCP;
 733
 734         hint.ai_flags = AI_PASSIVE;
 735
 736 #if HAVE_DECL_RES_INIT
 737         res_init();
 738
 739 #endif
 740         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 741
 742         free(address);
 743
 744         if(err || !ai) {
 745                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 746                 return false;
 747         }
 748
 749         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 750                 // Ignore duplicate addresses
 751                 bool found = false;
 752
 753                 for(int i = 0; i < listen_sockets; i++)
 754                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 755                                 found = true;
 756                                 break;
 757                         }
 758
 759                 if(found) {
 760                         continue;
 761                 }
 762
 763                 if(listen_sockets >= MAXSOCKETS) {
 764                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 765                         return false;
 766                 }
 767
 768                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 769
 770                 if(tcp_fd < 0) {
 771                         continue;
 772                 }
 773
 774                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 775
 776                 if(udp_fd < 0) {
 777                         close(tcp_fd);
 778                         continue;
 779                 }
 780
 781                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 782                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 783
 784                 if(debug_level >= DEBUG_CONNECTIONS) {
 785                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 786                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 787                         free(hostname);
 788                 }
 789
 790                 listen_socket[listen_sockets].bindto = bindto;
 791                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 792                 listen_sockets++;
 793         }
 794
 795         freeaddrinfo(ai);
 796         return true;
 797 }
 798
 799 void device_enable(void) {
 800         if(devops.enable) {
 801                 devops.enable();
 802         }
 803
 804         /* Run tinc-up script to further initialize the tap interface */
 805
 806         environment_t env;
 807         environment_init(&env);
 808         execute_script("tinc-up", &env);
 809         environment_exit(&env);
 810 }
 811
 812 void device_disable(void) {
 813         environment_t env;
 814         environment_init(&env);
 815         execute_script("tinc-down", &env);
 816         environment_exit(&env);
 817
 818         if(devops.disable) {
 819                 devops.disable();
 820         }
 821 }
 822
 823 /*
 824   Configure node_t myself and set up the local sockets (listen only)
 825 */
 826 static bool setup_myself(void) {
 827         char *name, *hostname, *type;
 828         char *address = NULL;
 829         bool port_specified = false;
 830
 831         if(!(name = get_name())) {
 832                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 833                 return false;
 834         }
 835
 836         myname = xstrdup(name);
 837         myself = new_node();
 838         myself->connection = new_connection();
 839         myself->name = name;
 840         myself->connection->name = xstrdup(name);
 841         read_host_config(config_tree, name, true);
 842
 843         if(!get_config_string(lookup_config(config_tree, "Port"), &myport)) {
 844                 myport = xstrdup("655");
 845         } else {
 846                 port_specified = true;
 847         }
 848
 849         myself->connection->options = 0;
 850         myself->connection->protocol_major = PROT_MAJOR;
 851         myself->connection->protocol_minor = PROT_MINOR;
 852
 853         myself->options |= PROT_MINOR << 24;
 854
 855 #ifdef DISABLE_LEGACY
 856         experimental = read_ecdsa_private_key();
 857
 858         if(!experimental) {
 859                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 860                 return false;
 861         }
 862
 863 #else
 864
 865         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 866                 experimental = read_ecdsa_private_key();
 867
 868                 if(!experimental) {
 869                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 870                 }
 871         } else {
 872                 if(experimental && !read_ecdsa_private_key()) {
 873                         return false;
 874                 }
 875         }
 876
 877         if(!read_rsa_private_key()) {
 878                 if(experimental) {
 879                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 880                 } else {
 881                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 882                         return false;
 883                 }
 884         }
 885
 886 #endif
 887
 888         /* Ensure myport is numeric */
 889
 890         if(!atoi(myport)) {
 891                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 892                 sockaddr_t sa;
 893
 894                 if(!ai || !ai->ai_addr) {
 895                         return false;
 896                 }
 897
 898                 free(myport);
 899                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 900                 freeaddrinfo(ai);
 901                 sockaddr2str(&sa, NULL, &myport);
 902         }
 903
 904         /* Read in all the subnets specified in the host configuration file */
 905
 906         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 907                 subnet_t *subnet;
 908
 909                 if(!get_config_subnet(cfg, &subnet)) {
 910                         return false;
 911                 }
 912
 913                 subnet_add(myself, subnet);
 914         }
 915
 916         /* Check some options */
 917
 918         if(!setup_myself_reloadable()) {
 919                 return false;
 920         }
 921
 922         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 923         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 924         strictsubnets |= tunnelserver;
 925
 926         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 927                 if(max_connection_burst <= 0) {
 928                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 929                         return false;
 930                 }
 931         }
 932
 933         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 934                 if(udp_rcvbuf < 0) {
 935                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 936                         return false;
 937                 }
 938         }
 939
 940         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 941                 if(udp_sndbuf < 0) {
 942                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 943                         return false;
 944                 }
 945         }
 946
 947         get_config_int(lookup_config(config_tree, "FWMark"), &fwmark);
 948 #ifndef SO_MARK
 949
 950         if(fwmark) {
 951                 logger(DEBUG_ALWAYS, LOG_ERR, "FWMark not supported on this platform!");
 952                 return false;
 953         }
 954
 955 #endif
 956
 957         int replaywin_int;
 958
 959         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 960                 if(replaywin_int < 0) {
 961                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 962                         return false;
 963                 }
 964
 965                 replaywin = (unsigned)replaywin_int;
 966                 sptps_replaywin = replaywin;
 967         }
 968
 969 #ifndef DISABLE_LEGACY
 970         /* Generate packet encryption key */
 971
 972         char *cipher;
 973
 974         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher)) {
 975                 cipher = xstrdup("aes-256-cbc");
 976         }
 977
 978         if(!strcasecmp(cipher, "none")) {
 979                 myself->incipher = NULL;
 980         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 981                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 982                 free(cipher);
 983                 return false;
 984         }
 985
 986         free(cipher);
 987
 988         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval) {
 989                 keylifetime, rand() % 100000
 990         });
 991
 992         /* Check if we want to use message authentication codes... */
 993
 994         int maclength = 4;
 995         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 996
 997         if(maclength < 0) {
 998                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 999                 return false;
1000         }
1001
1002         char *digest;
1003
1004         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
1005                 digest = xstrdup("sha256");
1006         }
1007
1008         if(!strcasecmp(digest, "none")) {
1009                 myself->indigest = NULL;
1010         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
1011                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
1012                 free(digest);
1013                 return false;
1014         }
1015
1016         free(digest);
1017 #endif
1018
1019         /* Compression */
1020
1021         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
1022                 if(myself->incompression < 0 || myself->incompression > 11) {
1023                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
1024                         return false;
1025                 }
1026         } else {
1027                 myself->incompression = 0;
1028         }
1029
1030         myself->connection->outcompression = 0;
1031
1032         /* Done */
1033
1034         myself->nexthop = myself;
1035         myself->via = myself;
1036         myself->status.reachable = true;
1037         myself->last_state_change = now.tv_sec;
1038         myself->status.sptps = experimental;
1039         node_add(myself);
1040
1041         graph();
1042
1043         load_all_nodes();
1044
1045         /* Open device */
1046
1047         devops = os_devops;
1048
1049         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
1050                 if(!strcasecmp(type, "dummy")) {
1051                         devops = dummy_devops;
1052                 } else if(!strcasecmp(type, "raw_socket")) {
1053                         devops = raw_socket_devops;
1054                 } else if(!strcasecmp(type, "multicast")) {
1055                         devops = multicast_devops;
1056                 } else if(!strcasecmp(type, "fd")) {
1057                         devops = fd_devops;
1058                 }
1059
1060 #ifdef ENABLE_UML
1061                 else if(!strcasecmp(type, "uml")) {
1062                         devops = uml_devops;
1063                 }
1064
1065 #endif
1066 #ifdef ENABLE_VDE
1067                 else if(!strcasecmp(type, "vde")) {
1068                         devops = vde_devops;
1069                 }
1070
1071 #endif
1072                 free(type);
1073         }
1074
1075         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
1076
1077         if(!devops.setup()) {
1078                 return false;
1079         }
1080
1081         if(device_fd >= 0) {
1082                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
1083         }
1084
1085         /* Open sockets */
1086
1087         if(!do_detach && getenv("LISTEN_FDS")) {
1088                 sockaddr_t sa;
1089                 socklen_t salen;
1090
1091                 listen_sockets = atoi(getenv("LISTEN_FDS"));
1092 #ifdef HAVE_UNSETENV
1093                 unsetenv("LISTEN_FDS");
1094 #endif
1095
1096                 if(listen_sockets > MAXSOCKETS) {
1097                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
1098                         return false;
1099                 }
1100
1101                 for(int i = 0; i < listen_sockets; i++) {
1102                         salen = sizeof(sa);
1103
1104                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
1105                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
1106                                 return false;
1107                         }
1108
1109 #ifdef FD_CLOEXEC
1110                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
1111 #endif
1112
1113                         int udp_fd = setup_vpn_in_socket(&sa);
1114
1115                         if(udp_fd < 0) {
1116                                 return false;
1117                         }
1118
1119                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
1120                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1121
1122                         if(debug_level >= DEBUG_CONNECTIONS) {
1123                                 hostname = sockaddr2hostname(&sa);
1124                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1125                                 free(hostname);
1126                         }
1127
1128                         memcpy(&listen_socket[i].sa, &sa, salen);
1129                 }
1130         } else {
1131                 listen_sockets = 0;
1132                 int cfgs = 0;
1133
1134                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1135                         cfgs++;
1136                         get_config_string(cfg, &address);
1137
1138                         if(!add_listen_address(address, true)) {
1139                                 return false;
1140                         }
1141                 }
1142
1143                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1144                         cfgs++;
1145                         get_config_string(cfg, &address);
1146
1147                         if(!add_listen_address(address, false)) {
1148                                 return false;
1149                         }
1150                 }
1151
1152                 if(!cfgs)
1153                         if(!add_listen_address(address, NULL)) {
1154                                 return false;
1155                         }
1156         }
1157
1158         if(!listen_sockets) {
1159                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1160                 return false;
1161         }
1162
1163         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1164
1165         if(!port_specified || atoi(myport) == 0) {
1166                 sockaddr_t sa;
1167                 socklen_t salen = sizeof(sa);
1168
1169                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1170                         free(myport);
1171                         sockaddr2str(&sa, NULL, &myport);
1172
1173                         if(!myport) {
1174                                 myport = xstrdup("655");
1175                         }
1176                 }
1177         }
1178
1179         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1180         myself->connection->hostname = xstrdup(myself->hostname);
1181
1182         char *upnp = NULL;
1183         get_config_string(lookup_config(config_tree, "UPnP"), &upnp);
1184         bool upnp_tcp = false;
1185         bool upnp_udp = false;
1186
1187         if(upnp) {
1188                 if(!strcasecmp(upnp, "yes")) {
1189                         upnp_tcp = upnp_udp = true;
1190                 } else if(!strcasecmp(upnp, "udponly")) {
1191                         upnp_udp = true;
1192                 }
1193
1194                 free(upnp);
1195         }
1196
1197         if(upnp_tcp || upnp_udp) {
1198 #ifdef HAVE_MINIUPNPC
1199                 upnp_init(upnp_tcp, upnp_udp);
1200 #else
1201                 logger(DEBUG_ALWAYS, LOG_WARNING, "UPnP was requested, but tinc isn't built with miniupnpc support!");
1202 #endif
1203         }
1204
1205         /* Done. */
1206
1207         last_config_check = now.tv_sec;
1208
1209         return true;
1210 }
1211
1212 /*
1213   initialize network
1214 */
1215 bool setup_network(void) {
1216         init_connections();
1217         init_subnets();
1218         init_nodes();
1219         init_edges();
1220         init_requests();
1221
1222         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1223                 if(pinginterval < 1) {
1224                         pinginterval = 86400;
1225                 }
1226         } else {
1227                 pinginterval = 60;
1228         }
1229
1230         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) {
1231                 pingtimeout = 5;
1232         }
1233
1234         if(pingtimeout < 1 || pingtimeout > pinginterval) {
1235                 pingtimeout = pinginterval;
1236         }
1237
1238         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize)) {
1239                 maxoutbufsize = 10 * MTU;
1240         }
1241
1242         if(!setup_myself()) {
1243                 return false;
1244         }
1245
1246         if(!init_control()) {
1247                 return false;
1248         }
1249
1250         if(!device_standby) {
1251                 device_enable();
1252         }
1253
1254         /* Run subnet-up scripts for our own subnets */
1255
1256         subnet_update(myself, NULL, true);
1257
1258         return true;
1259 }
1260
1261 /*
1262   close all open network connections
1263 */
1264 void close_network_connections(void) {
1265         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1266                 next = node->next;
1267                 connection_t *c = node->data;
1268
1269                 /* Keep control connections open until the end, so they know when we really terminated */
1270                 if(c->status.control) {
1271                         c->socket = -1;
1272                 }
1273
1274                 c->outgoing = NULL;
1275                 terminate_connection(c, false);
1276         }
1277
1278         if(outgoing_list) {
1279                 list_delete_list(outgoing_list);
1280         }
1281
1282         if(myself && myself->connection) {
1283                 subnet_update(myself, NULL, false);
1284                 connection_del(myself->connection);
1285         }
1286
1287         for(int i = 0; i < listen_sockets; i++) {
1288                 io_del(&listen_socket[i].tcp);
1289                 io_del(&listen_socket[i].udp);
1290                 close(listen_socket[i].tcp.fd);
1291                 close(listen_socket[i].udp.fd);
1292         }
1293
1294         exit_requests();
1295         exit_edges();
1296         exit_subnets();
1297         exit_nodes();
1298         exit_connections();
1299
1300         if(!device_standby) {
1301                 device_disable();
1302         }
1303
1304         free(myport);
1305
1306         if(device_fd >= 0) {
1307                 io_del(&device_io);
1308         }
1309
1310         if(devops.close) {
1311                 devops.close();
1312         }
1313
1314         exit_control();
1315
1316         free(scriptextension);
1317         free(scriptinterpreter);
1318
1319         return;
1320 }