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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2021 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 key pair 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 & ~0100700u) {
 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 key pair 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 & ~0100700u) {
 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                 udp_rcvbuf_warnings = true;
 940         }
 941
 942         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 943                 if(udp_sndbuf < 0) {
 944                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 945                         return false;
 946                 }
 947
 948                 udp_sndbuf_warnings = true;
 949         }
 950
 951         get_config_int(lookup_config(config_tree, "FWMark"), &fwmark);
 952 #ifndef SO_MARK
 953
 954         if(fwmark) {
 955                 logger(DEBUG_ALWAYS, LOG_ERR, "FWMark not supported on this platform!");
 956                 return false;
 957         }
 958
 959 #endif
 960
 961         int replaywin_int;
 962
 963         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 964                 if(replaywin_int < 0) {
 965                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 966                         return false;
 967                 }
 968
 969                 replaywin = (unsigned)replaywin_int;
 970                 sptps_replaywin = replaywin;
 971         }
 972
 973 #ifndef DISABLE_LEGACY
 974         /* Generate packet encryption key */
 975
 976         char *cipher;
 977
 978         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher)) {
 979                 cipher = xstrdup("aes-256-cbc");
 980         }
 981
 982         if(!strcasecmp(cipher, "none")) {
 983                 myself->incipher = NULL;
 984         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 985                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 986                 free(cipher);
 987                 return false;
 988         }
 989
 990         free(cipher);
 991
 992         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval) {
 993                 keylifetime, rand() % 100000
 994         });
 995
 996         /* Check if we want to use message authentication codes... */
 997
 998         int maclength = 4;
 999         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
1000
1001         if(maclength < 0) {
1002                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
1003                 return false;
1004         }
1005
1006         char *digest;
1007
1008         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
1009                 digest = xstrdup("sha256");
1010         }
1011
1012         if(!strcasecmp(digest, "none")) {
1013                 myself->indigest = NULL;
1014         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
1015                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
1016                 free(digest);
1017                 return false;
1018         }
1019
1020         free(digest);
1021 #endif
1022
1023         /* Compression */
1024
1025         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
1026                 switch(myself->incompression) {
1027                 case 12:
1028 #ifdef HAVE_LZ4
1029                         break;
1030 #else
1031                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
1032                         logger(DEBUG_ALWAYS, LOG_ERR, "LZ4 compression is unavailable on this node.");
1033                         return false;
1034 #endif
1035
1036                 case 11:
1037                 case 10:
1038 #ifdef HAVE_LZO
1039                         break;
1040 #else
1041                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
1042                         logger(DEBUG_ALWAYS, LOG_ERR, "LZO compression is unavailable on this node.");
1043                         return false;
1044 #endif
1045
1046                 case 9:
1047                 case 8:
1048                 case 7:
1049                 case 6:
1050                 case 5:
1051                 case 4:
1052                 case 3:
1053                 case 2:
1054                 case 1:
1055 #ifdef HAVE_ZLIB
1056                         break;
1057 #else
1058                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
1059                         logger(DEBUG_ALWAYS, LOG_ERR, "ZLIB compression is unavailable on this node.");
1060                         return false;
1061 #endif
1062
1063                 case 0:
1064                         break;
1065
1066                 default:
1067                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
1068                         logger(DEBUG_ALWAYS, LOG_ERR, "Compression level %i is unrecognized by this node.", myself->incompression);
1069                         return false;
1070                 }
1071         } else {
1072                 myself->incompression = 0;
1073         }
1074
1075         myself->connection->outcompression = 0;
1076
1077         /* Done */
1078
1079         myself->nexthop = myself;
1080         myself->via = myself;
1081         myself->status.reachable = true;
1082         myself->last_state_change = now.tv_sec;
1083         myself->status.sptps = experimental;
1084         node_add(myself);
1085
1086         graph();
1087
1088         load_all_nodes();
1089
1090         /* Open device */
1091
1092         devops = os_devops;
1093
1094         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
1095                 if(!strcasecmp(type, "dummy")) {
1096                         devops = dummy_devops;
1097                 } else if(!strcasecmp(type, "raw_socket")) {
1098                         devops = raw_socket_devops;
1099                 } else if(!strcasecmp(type, "multicast")) {
1100                         devops = multicast_devops;
1101                 }
1102
1103 #ifdef HAVE_SYS_UN_H
1104                 else if(!strcasecmp(type, "fd")) {
1105                         devops = fd_devops;
1106                 }
1107
1108 #endif
1109 #ifdef ENABLE_UML
1110                 else if(!strcasecmp(type, "uml")) {
1111                         devops = uml_devops;
1112                 }
1113
1114 #endif
1115 #ifdef ENABLE_VDE
1116                 else if(!strcasecmp(type, "vde")) {
1117                         devops = vde_devops;
1118                 }
1119
1120 #endif
1121                 free(type);
1122         }
1123
1124         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
1125
1126         if(!devops.setup()) {
1127                 return false;
1128         }
1129
1130         if(device_fd >= 0) {
1131                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
1132         }
1133
1134         /* Open sockets */
1135
1136         if(!do_detach && getenv("LISTEN_FDS")) {
1137                 sockaddr_t sa;
1138                 socklen_t salen;
1139
1140                 listen_sockets = atoi(getenv("LISTEN_FDS"));
1141 #ifdef HAVE_UNSETENV
1142                 unsetenv("LISTEN_FDS");
1143 #endif
1144
1145                 if(listen_sockets > MAXSOCKETS) {
1146                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
1147                         return false;
1148                 }
1149
1150                 for(int i = 0; i < listen_sockets; i++) {
1151                         salen = sizeof(sa);
1152
1153                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
1154                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
1155                                 return false;
1156                         }
1157
1158 #ifdef FD_CLOEXEC
1159                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
1160 #endif
1161
1162                         int udp_fd = setup_vpn_in_socket(&sa);
1163
1164                         if(udp_fd < 0) {
1165                                 return false;
1166                         }
1167
1168                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
1169                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1170
1171                         if(debug_level >= DEBUG_CONNECTIONS) {
1172                                 hostname = sockaddr2hostname(&sa);
1173                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1174                                 free(hostname);
1175                         }
1176
1177                         memcpy(&listen_socket[i].sa, &sa, salen);
1178                 }
1179         } else {
1180                 listen_sockets = 0;
1181                 int cfgs = 0;
1182
1183                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1184                         cfgs++;
1185                         get_config_string(cfg, &address);
1186
1187                         if(!add_listen_address(address, true)) {
1188                                 return false;
1189                         }
1190                 }
1191
1192                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1193                         cfgs++;
1194                         get_config_string(cfg, &address);
1195
1196                         if(!add_listen_address(address, false)) {
1197                                 return false;
1198                         }
1199                 }
1200
1201                 if(!cfgs)
1202                         if(!add_listen_address(address, NULL)) {
1203                                 return false;
1204                         }
1205         }
1206
1207         if(!listen_sockets) {
1208                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1209                 return false;
1210         }
1211
1212         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1213
1214         if(!port_specified || atoi(myport) == 0) {
1215                 sockaddr_t sa;
1216                 socklen_t salen = sizeof(sa);
1217
1218                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1219                         free(myport);
1220                         sockaddr2str(&sa, NULL, &myport);
1221
1222                         if(!myport) {
1223                                 myport = xstrdup("655");
1224                         }
1225                 }
1226         }
1227
1228         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1229         myself->connection->hostname = xstrdup(myself->hostname);
1230
1231         char *upnp = NULL;
1232         get_config_string(lookup_config(config_tree, "UPnP"), &upnp);
1233         bool upnp_tcp = false;
1234         bool upnp_udp = false;
1235
1236         if(upnp) {
1237                 if(!strcasecmp(upnp, "yes")) {
1238                         upnp_tcp = upnp_udp = true;
1239                 } else if(!strcasecmp(upnp, "udponly")) {
1240                         upnp_udp = true;
1241                 }
1242
1243                 free(upnp);
1244         }
1245
1246         if(upnp_tcp || upnp_udp) {
1247 #ifdef HAVE_MINIUPNPC
1248                 upnp_init(upnp_tcp, upnp_udp);
1249 #else
1250                 logger(DEBUG_ALWAYS, LOG_WARNING, "UPnP was requested, but tinc isn't built with miniupnpc support!");
1251 #endif
1252         }
1253
1254         /* Done. */
1255
1256         last_config_check = now.tv_sec;
1257
1258         return true;
1259 }
1260
1261 /*
1262   initialize network
1263 */
1264 bool setup_network(void) {
1265         init_connections();
1266         init_subnets();
1267         init_nodes();
1268         init_edges();
1269         init_requests();
1270
1271         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1272                 if(pinginterval < 1) {
1273                         pinginterval = 86400;
1274                 }
1275         } else {
1276                 pinginterval = 60;
1277         }
1278
1279         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) {
1280                 pingtimeout = 5;
1281         }
1282
1283         if(pingtimeout < 1 || pingtimeout > pinginterval) {
1284                 pingtimeout = pinginterval;
1285         }
1286
1287         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize)) {
1288                 maxoutbufsize = 10 * MTU;
1289         }
1290
1291         if(!setup_myself()) {
1292                 return false;
1293         }
1294
1295         if(!init_control()) {
1296                 return false;
1297         }
1298
1299         if(!device_standby) {
1300                 device_enable();
1301         }
1302
1303         /* Run subnet-up scripts for our own subnets */
1304
1305         subnet_update(myself, NULL, true);
1306
1307         return true;
1308 }
1309
1310 /*
1311   close all open network connections
1312 */
1313 void close_network_connections(void) {
1314         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1315                 next = node->next;
1316                 connection_t *c = node->data;
1317
1318                 /* Keep control connections open until the end, so they know when we really terminated */
1319                 if(c->status.control) {
1320                         c->socket = -1;
1321                 }
1322
1323                 c->outgoing = NULL;
1324                 terminate_connection(c, false);
1325         }
1326
1327         if(outgoing_list) {
1328                 list_delete_list(outgoing_list);
1329         }
1330
1331         if(myself && myself->connection) {
1332                 subnet_update(myself, NULL, false);
1333                 free_connection(myself->connection);
1334         }
1335
1336         for(int i = 0; i < listen_sockets; i++) {
1337                 io_del(&listen_socket[i].tcp);
1338                 io_del(&listen_socket[i].udp);
1339                 close(listen_socket[i].tcp.fd);
1340                 close(listen_socket[i].udp.fd);
1341         }
1342
1343         exit_requests();
1344         exit_edges();
1345         exit_subnets();
1346         exit_nodes();
1347         exit_connections();
1348
1349         if(!device_standby) {
1350                 device_disable();
1351         }
1352
1353         free(myport);
1354
1355         if(device_fd >= 0) {
1356                 io_del(&device_io);
1357         }
1358
1359         if(devops.close) {
1360                 devops.close();
1361         }
1362
1363         exit_control();
1364
1365         free(scriptextension);
1366         free(scriptinterpreter);
1367
1368         return;
1369 }