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