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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2021 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 = NULL;
  56 char *proxyport = NULL;
  57 char *proxyuser = NULL;
  58 char *proxypass = NULL;
  59
  60 proxytype_t proxytype;
  61 bool autoconnect;
  62 bool disablebuggypeers;
  63
  64 char *scriptinterpreter;
  65 char *scriptextension;
  66
  67 bool node_read_ecdsa_public_key(node_t *n) {
  68         if(ecdsa_active(n->ecdsa)) {
  69                 return true;
  70         }
  71
  72         splay_tree_t *config_tree;
  73         FILE *fp;
  74         char *pubname = NULL;
  75         char *p;
  76
  77         init_configuration(&config_tree);
  78
  79         if(!read_host_config(config_tree, n->name, true)) {
  80                 goto exit;
  81         }
  82
  83         /* First, check for simple Ed25519PublicKey statement */
  84
  85         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  86                 n->ecdsa = ecdsa_set_base64_public_key(p);
  87                 free(p);
  88                 goto exit;
  89         }
  90
  91         /* Else, check for Ed25519PublicKeyFile statement and read it */
  92
  93         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname)) {
  94                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  95         }
  96
  97         fp = fopen(pubname, "r");
  98
  99         if(!fp) {
 100                 goto exit;
 101         }
 102
 103         n->ecdsa = ecdsa_read_pem_public_key(fp);
 104         fclose(fp);
 105
 106 exit:
 107         exit_configuration(&config_tree);
 108         free(pubname);
 109         return n->ecdsa;
 110 }
 111
 112 bool read_ecdsa_public_key(connection_t *c) {
 113         if(ecdsa_active(c->ecdsa)) {
 114                 return true;
 115         }
 116
 117         FILE *fp;
 118         char *fname;
 119         char *p;
 120
 121         if(!c->config_tree) {
 122                 init_configuration(&c->config_tree);
 123
 124                 if(!read_host_config(c->config_tree, c->name, true)) {
 125                         return false;
 126                 }
 127         }
 128
 129         /* First, check for simple Ed25519PublicKey statement */
 130
 131         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 132                 c->ecdsa = ecdsa_set_base64_public_key(p);
 133                 free(p);
 134                 return c->ecdsa;
 135         }
 136
 137         /* Else, check for Ed25519PublicKeyFile statement and read it */
 138
 139         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname)) {
 140                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 141         }
 142
 143         fp = fopen(fname, "r");
 144
 145         if(!fp) {
 146                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
 147                        fname, strerror(errno));
 148                 free(fname);
 149                 return false;
 150         }
 151
 152         c->ecdsa = ecdsa_read_pem_public_key(fp);
 153
 154         if(!c->ecdsa && errno != ENOENT) {
 155                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 156         }
 157
 158         fclose(fp);
 159         free(fname);
 160         return c->ecdsa;
 161 }
 162
 163 #ifndef DISABLE_LEGACY
 164 bool read_rsa_public_key(connection_t *c) {
 165         FILE *fp;
 166         char *fname;
 167         char *n;
 168
 169         /* First, check for simple PublicKey statement */
 170
 171         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 172                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 173                 free(n);
 174                 return c->rsa;
 175         }
 176
 177         /* Else, check for PublicKeyFile statement and read it */
 178
 179         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
 180                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 181         }
 182
 183         fp = fopen(fname, "r");
 184
 185         if(!fp) {
 186                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 187                 free(fname);
 188                 return false;
 189         }
 190
 191         c->rsa = rsa_read_pem_public_key(fp);
 192         fclose(fp);
 193
 194         if(!c->rsa) {
 195                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 196         }
 197
 198         free(fname);
 199         return c->rsa;
 200 }
 201 #endif
 202
 203 static bool read_ecdsa_private_key(void) {
 204         FILE *fp;
 205         char *fname;
 206
 207         /* Check for PrivateKeyFile statement and read it */
 208
 209         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname)) {
 210                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 211         }
 212
 213         fp = fopen(fname, "r");
 214
 215         if(!fp) {
 216                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 217
 218                 if(errno == ENOENT) {
 219                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 key pair with `tinc -n %s generate-ed25519-keys'.", netname ? netname : ".");
 220                 }
 221
 222                 free(fname);
 223                 return false;
 224         }
 225
 226 #ifndef HAVE_MINGW
 227         struct stat s;
 228
 229         if(fstat(fileno(fp), &s)) {
 230                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 231                 free(fname);
 232                 return false;
 233         }
 234
 235         if(s.st_mode & ~0100700u) {
 236                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 237         }
 238
 239 #endif
 240
 241         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 242         fclose(fp);
 243
 244         if(!myself->connection->ecdsa) {
 245                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 246         }
 247
 248         free(fname);
 249         return myself->connection->ecdsa;
 250 }
 251
 252 static bool read_invitation_key(void) {
 253         FILE *fp;
 254         char fname[PATH_MAX];
 255
 256         if(invitation_key) {
 257                 ecdsa_free(invitation_key);
 258                 invitation_key = NULL;
 259         }
 260
 261         snprintf(fname, sizeof(fname), "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 262
 263         fp = fopen(fname, "r");
 264
 265         if(fp) {
 266                 invitation_key = ecdsa_read_pem_private_key(fp);
 267                 fclose(fp);
 268
 269                 if(!invitation_key) {
 270                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 271                 }
 272         }
 273
 274         return invitation_key;
 275 }
 276
 277 #ifndef DISABLE_LEGACY
 278 static bool read_rsa_private_key(void) {
 279         FILE *fp;
 280         char *fname;
 281         char *n, *d;
 282
 283         /* First, check for simple PrivateKey statement */
 284
 285         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 286                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 287                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 288                         free(d);
 289                         return false;
 290                 }
 291
 292                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 293                 free(n);
 294                 free(d);
 295                 return myself->connection->rsa;
 296         }
 297
 298         /* Else, check for PrivateKeyFile statement and read it */
 299
 300         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname)) {
 301                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 302         }
 303
 304         fp = fopen(fname, "r");
 305
 306         if(!fp) {
 307                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 308                        fname, strerror(errno));
 309
 310                 if(errno == ENOENT) {
 311                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an RSA key pair with `tinc -n %s generate-rsa-keys'.", netname ? netname : ".");
 312                 }
 313
 314                 free(fname);
 315                 return false;
 316         }
 317
 318 #ifndef HAVE_MINGW
 319         struct stat s;
 320
 321         if(fstat(fileno(fp), &s)) {
 322                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 323                 free(fname);
 324                 return false;
 325         }
 326
 327         if(s.st_mode & ~0100700u) {
 328                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 329         }
 330
 331 #endif
 332
 333         myself->connection->rsa = rsa_read_pem_private_key(fp);
 334         fclose(fp);
 335
 336         if(!myself->connection->rsa) {
 337                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 338         }
 339
 340         free(fname);
 341         return myself->connection->rsa;
 342 }
 343 #endif
 344
 345 #ifndef DISABLE_LEGACY
 346 static timeout_t keyexpire_timeout;
 347
 348 static void keyexpire_handler(void *data) {
 349         regenerate_key();
 350         timeout_set(data, &(struct timeval) {
 351                 keylifetime, rand() % 100000
 352         });
 353 }
 354 #endif
 355
 356 void regenerate_key(void) {
 357         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 358         send_key_changed();
 359
 360         for splay_each(node_t, n, node_tree) {
 361                 n->status.validkey_in = false;
 362         }
 363 }
 364
 365 void load_all_nodes(void) {
 366         DIR *dir;
 367         struct dirent *ent;
 368         char dname[PATH_MAX];
 369
 370         snprintf(dname, sizeof(dname), "%s" SLASH "hosts", confbase);
 371         dir = opendir(dname);
 372
 373         if(!dir) {
 374                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 375                 return;
 376         }
 377
 378         while((ent = readdir(dir))) {
 379                 if(!check_id(ent->d_name)) {
 380                         continue;
 381                 }
 382
 383                 node_t *n = lookup_node(ent->d_name);
 384
 385                 splay_tree_t *config_tree;
 386                 init_configuration(&config_tree);
 387                 read_config_options(config_tree, ent->d_name);
 388                 read_host_config(config_tree, ent->d_name, true);
 389
 390                 if(!n) {
 391                         n = new_node();
 392                         n->name = xstrdup(ent->d_name);
 393                         node_add(n);
 394                 }
 395
 396                 if(strictsubnets) {
 397                         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 398                                 subnet_t *s, *s2;
 399
 400                                 if(!get_config_subnet(cfg, &s)) {
 401                                         continue;
 402                                 }
 403
 404                                 if((s2 = lookup_subnet(n, s))) {
 405                                         s2->expires = -1;
 406                                         free(s);
 407                                 } else {
 408                                         subnet_add(n, s);
 409                                 }
 410                         }
 411                 }
 412
 413                 if(lookup_config(config_tree, "Address")) {
 414                         n->status.has_address = true;
 415                 }
 416
 417                 exit_configuration(&config_tree);
 418         }
 419
 420         closedir(dir);
 421 }
 422
 423 char *get_name(void) {
 424         char *name = NULL;
 425         char *returned_name;
 426
 427         get_config_string(lookup_config(config_tree, "Name"), &name);
 428
 429         if(!name) {
 430                 return NULL;
 431         }
 432
 433         returned_name = replace_name(name);
 434         free(name);
 435         return returned_name;
 436 }
 437
 438 bool setup_myself_reloadable(void) {
 439         free(scriptinterpreter);
 440         scriptinterpreter = NULL;
 441
 442         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 443
 444         free(scriptextension);
 445
 446         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension)) {
 447                 scriptextension = xstrdup("");
 448         }
 449
 450         char *proxy = NULL;
 451
 452         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 453
 454         if(proxy) {
 455                 char *space;
 456
 457                 if((space = strchr(proxy, ' '))) {
 458                         *space++ = 0;
 459                 }
 460
 461                 if(!strcasecmp(proxy, "none")) {
 462                         proxytype = PROXY_NONE;
 463                 } else if(!strcasecmp(proxy, "socks4")) {
 464                         proxytype = PROXY_SOCKS4;
 465                 } else if(!strcasecmp(proxy, "socks4a")) {
 466                         proxytype = PROXY_SOCKS4A;
 467                 } else if(!strcasecmp(proxy, "socks5")) {
 468                         proxytype = PROXY_SOCKS5;
 469                 } else if(!strcasecmp(proxy, "http")) {
 470                         proxytype = PROXY_HTTP;
 471                 } else if(!strcasecmp(proxy, "exec")) {
 472                         proxytype = PROXY_EXEC;
 473                 } else {
 474                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 475                         free(proxy);
 476                         return false;
 477                 }
 478
 479                 free(proxyhost);
 480                 proxyhost = NULL;
 481
 482                 free(proxyport);
 483                 proxyport = NULL;
 484
 485                 free(proxyuser);
 486                 proxyuser = NULL;
 487
 488                 free(proxypass);
 489                 proxypass = NULL;
 490
 491                 switch(proxytype) {
 492                 case PROXY_NONE:
 493                 default:
 494                         break;
 495
 496                 case PROXY_EXEC:
 497                         if(!space || !*space) {
 498                                 logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 499                                 free(proxy);
 500                                 return false;
 501                         }
 502
 503                         proxyhost = xstrdup(space);
 504                         break;
 505
 506                 case PROXY_SOCKS4:
 507                 case PROXY_SOCKS4A:
 508                 case PROXY_SOCKS5:
 509                 case PROXY_HTTP:
 510                         proxyhost = space;
 511
 512                         if(space && (space = strchr(space, ' '))) {
 513                                 *space++ = 0, proxyport = space;
 514                         }
 515
 516                         if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 517                                 logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 518                                 proxyport = NULL;
 519                                 proxyhost = NULL;
 520                                 free(proxy);
 521                                 return false;
 522                         }
 523
 524                         if(space && (space = strchr(space, ' '))) {
 525                                 *space++ = 0, proxyuser = space;
 526                         }
 527
 528                         if(space && (space = strchr(space, ' '))) {
 529                                 *space++ = 0, proxypass = space;
 530                         }
 531
 532                         proxyhost = xstrdup(proxyhost);
 533                         proxyport = xstrdup(proxyport);
 534
 535                         if(proxyuser && *proxyuser) {
 536                                 proxyuser = xstrdup(proxyuser);
 537                         }
 538
 539                         if(proxypass && *proxypass) {
 540                                 proxypass = xstrdup(proxypass);
 541                         }
 542
 543                         break;
 544                 }
 545
 546                 free(proxy);
 547         }
 548
 549         bool choice;
 550
 551         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice) {
 552                 myself->options |= OPTION_INDIRECT;
 553         }
 554
 555         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice) {
 556                 myself->options |= OPTION_TCPONLY;
 557         }
 558
 559         if(myself->options & OPTION_TCPONLY) {
 560                 myself->options |= OPTION_INDIRECT;
 561         }
 562
 563         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
 564         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 565         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 566         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 567
 568         get_config_int(lookup_config(config_tree, "MTUInfoInterval"), &mtu_info_interval);
 569         get_config_int(lookup_config(config_tree, "UDPInfoInterval"), &udp_info_interval);
 570
 571         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 572         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 573
 574         char *rmode = NULL;
 575
 576         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 577                 if(!strcasecmp(rmode, "router")) {
 578                         routing_mode = RMODE_ROUTER;
 579                 } else if(!strcasecmp(rmode, "switch")) {
 580                         routing_mode = RMODE_SWITCH;
 581                 } else if(!strcasecmp(rmode, "hub")) {
 582                         routing_mode = RMODE_HUB;
 583                 } else {
 584                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 585                         free(rmode);
 586                         return false;
 587                 }
 588
 589                 free(rmode);
 590         }
 591
 592         char *fmode = NULL;
 593
 594         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 595                 if(!strcasecmp(fmode, "off")) {
 596                         forwarding_mode = FMODE_OFF;
 597                 } else if(!strcasecmp(fmode, "internal")) {
 598                         forwarding_mode = FMODE_INTERNAL;
 599                 } else if(!strcasecmp(fmode, "kernel")) {
 600                         forwarding_mode = FMODE_KERNEL;
 601                 } else {
 602                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 603                         free(fmode);
 604                         return false;
 605                 }
 606
 607                 free(fmode);
 608         }
 609
 610         choice = !(myself->options & OPTION_TCPONLY);
 611         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 612
 613         if(choice) {
 614                 myself->options |= OPTION_PMTU_DISCOVERY;
 615         }
 616
 617         choice = true;
 618         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 619
 620         if(choice) {
 621                 myself->options |= OPTION_CLAMP_MSS;
 622         }
 623
 624         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 625         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 626
 627         char *bmode = NULL;
 628
 629         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 630                 if(!strcasecmp(bmode, "no")) {
 631                         broadcast_mode = BMODE_NONE;
 632                 } else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst")) {
 633                         broadcast_mode = BMODE_MST;
 634                 } else if(!strcasecmp(bmode, "direct")) {
 635                         broadcast_mode = BMODE_DIRECT;
 636                 } else {
 637                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 638                         free(bmode);
 639                         return false;
 640                 }
 641
 642                 free(bmode);
 643         }
 644
 645         const char *const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 646
 647         for(size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 648                 subnet_t *s = new_subnet();
 649
 650                 if(!str2net(s, DEFAULT_BROADCAST_SUBNETS[i])) {
 651                         abort();
 652                 }
 653
 654                 if(splay_search(subnet_tree, s)) {
 655                         free(s);
 656                 } else {
 657                         subnet_add(NULL, s);
 658                 }
 659         }
 660
 661         for(config_t *cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 662                 subnet_t *s;
 663
 664                 if(!get_config_subnet(cfg, &s)) {
 665                         continue;
 666                 }
 667
 668                 if(splay_search(subnet_tree, s)) {
 669                         free(s);
 670                 } else {
 671                         subnet_add(NULL, s);
 672                 }
 673         }
 674
 675 #if !defined(IP_TOS)
 676
 677         if(priorityinheritance) {
 678                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv4 connections", "PriorityInheritance");
 679         }
 680
 681 #endif
 682
 683 #if !defined(IPV6_TCLASS)
 684
 685         if(priorityinheritance) {
 686                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform for IPv6 connections", "PriorityInheritance");
 687         }
 688
 689 #endif
 690
 691         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire)) {
 692                 macexpire = 600;
 693         }
 694
 695         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 696                 if(maxtimeout <= 0) {
 697                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 698                         return false;
 699                 }
 700         } else {
 701                 maxtimeout = 900;
 702         }
 703
 704         char *afname = NULL;
 705
 706         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 707                 if(!strcasecmp(afname, "IPv4")) {
 708                         addressfamily = AF_INET;
 709                 } else if(!strcasecmp(afname, "IPv6")) {
 710                         addressfamily = AF_INET6;
 711                 } else if(!strcasecmp(afname, "any")) {
 712                         addressfamily = AF_UNSPEC;
 713                 } else {
 714                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 715                         free(afname);
 716                         return false;
 717                 }
 718
 719                 free(afname);
 720         }
 721
 722         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 723
 724         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime)) {
 725                 keylifetime = 3600;
 726         }
 727
 728         if(!get_config_bool(lookup_config(config_tree, "AutoConnect"), &autoconnect)) {
 729                 autoconnect = true;
 730         }
 731
 732         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 733
 734         if(!get_config_int(lookup_config(config_tree, "InvitationExpire"), &invitation_lifetime)) {
 735                 invitation_lifetime = 604800;        // 1 week
 736         }
 737
 738         read_invitation_key();
 739
 740         return true;
 741 }
 742
 743 /*
 744   Add listening sockets.
 745 */
 746 static bool add_listen_address(char *address, bool bindto) {
 747         char *port = myport;
 748
 749         if(address) {
 750                 char *space = strchr(address, ' ');
 751
 752                 if(space) {
 753                         *space++ = 0;
 754                         port = space;
 755                 }
 756
 757                 if(!strcmp(address, "*")) {
 758                         *address = 0;
 759                 }
 760         }
 761
 762         struct addrinfo *ai, hint = {0};
 763
 764         hint.ai_family = addressfamily;
 765
 766         hint.ai_socktype = SOCK_STREAM;
 767
 768         hint.ai_protocol = IPPROTO_TCP;
 769
 770         hint.ai_flags = AI_PASSIVE;
 771
 772 #if HAVE_DECL_RES_INIT
 773         res_init();
 774
 775 #endif
 776         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 777
 778         free(address);
 779
 780         if(err || !ai) {
 781                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 782                 return false;
 783         }
 784
 785         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 786                 // Ignore duplicate addresses
 787                 bool found = false;
 788
 789                 for(int i = 0; i < listen_sockets; i++)
 790                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 791                                 found = true;
 792                                 break;
 793                         }
 794
 795                 if(found) {
 796                         continue;
 797                 }
 798
 799                 if(listen_sockets >= MAXSOCKETS) {
 800                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 801                         freeaddrinfo(ai);
 802                         return false;
 803                 }
 804
 805                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 806
 807                 if(tcp_fd < 0) {
 808                         continue;
 809                 }
 810
 811                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 812
 813                 if(udp_fd < 0) {
 814                         close(tcp_fd);
 815                         continue;
 816                 }
 817
 818                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 819                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 820
 821                 if(debug_level >= DEBUG_CONNECTIONS) {
 822                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 823                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 824                         free(hostname);
 825                 }
 826
 827                 listen_socket[listen_sockets].bindto = bindto;
 828                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 829                 listen_sockets++;
 830         }
 831
 832         freeaddrinfo(ai);
 833         return true;
 834 }
 835
 836 void device_enable(void) {
 837         if(devops.enable) {
 838                 devops.enable();
 839         }
 840
 841         /* Run tinc-up script to further initialize the tap interface */
 842
 843         environment_t env;
 844         environment_init(&env);
 845         execute_script("tinc-up", &env);
 846         environment_exit(&env);
 847 }
 848
 849 void device_disable(void) {
 850         environment_t env;
 851         environment_init(&env);
 852         execute_script("tinc-down", &env);
 853         environment_exit(&env);
 854
 855         if(devops.disable) {
 856                 devops.disable();
 857         }
 858 }
 859
 860 /*
 861   Configure node_t myself and set up the local sockets (listen only)
 862 */
 863 static bool setup_myself(void) {
 864         char *name, *hostname, *type;
 865         char *address = NULL;
 866         bool port_specified = false;
 867
 868         if(!(name = get_name())) {
 869                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 870                 return false;
 871         }
 872
 873         myname = xstrdup(name);
 874         myself = new_node();
 875         myself->connection = new_connection();
 876         myself->name = name;
 877         myself->connection->name = xstrdup(name);
 878         read_host_config(config_tree, name, true);
 879
 880         if(!get_config_string(lookup_config(config_tree, "Port"), &myport)) {
 881                 myport = xstrdup("655");
 882         } else {
 883                 port_specified = true;
 884         }
 885
 886         myself->connection->options = 0;
 887         myself->connection->protocol_major = PROT_MAJOR;
 888         myself->connection->protocol_minor = PROT_MINOR;
 889
 890         myself->options |= PROT_MINOR << 24;
 891
 892 #ifdef DISABLE_LEGACY
 893         experimental = read_ecdsa_private_key();
 894
 895         if(!experimental) {
 896                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 897                 return false;
 898         }
 899
 900 #else
 901
 902         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 903                 experimental = read_ecdsa_private_key();
 904
 905                 if(!experimental) {
 906                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 907                 }
 908         } else {
 909                 if(experimental && !read_ecdsa_private_key()) {
 910                         return false;
 911                 }
 912         }
 913
 914         if(!read_rsa_private_key()) {
 915                 if(experimental) {
 916                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 917                 } else {
 918                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 919                         return false;
 920                 }
 921         }
 922
 923 #endif
 924
 925         /* Ensure myport is numeric */
 926
 927         if(!atoi(myport)) {
 928                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 929                 sockaddr_t sa;
 930
 931                 if(!ai || !ai->ai_addr) {
 932                         return false;
 933                 }
 934
 935                 free(myport);
 936                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 937                 freeaddrinfo(ai);
 938                 sockaddr2str(&sa, NULL, &myport);
 939         }
 940
 941         /* Read in all the subnets specified in the host configuration file */
 942
 943         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 944                 subnet_t *subnet;
 945
 946                 if(!get_config_subnet(cfg, &subnet)) {
 947                         return false;
 948                 }
 949
 950                 subnet_add(myself, subnet);
 951         }
 952
 953         /* Check some options */
 954
 955         if(!setup_myself_reloadable()) {
 956                 return false;
 957         }
 958
 959         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 960         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 961         strictsubnets |= tunnelserver;
 962
 963         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 964                 if(max_connection_burst <= 0) {
 965                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 966                         return false;
 967                 }
 968         }
 969
 970         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 971                 if(udp_rcvbuf < 0) {
 972                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 973                         return false;
 974                 }
 975
 976                 udp_rcvbuf_warnings = true;
 977         }
 978
 979         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 980                 if(udp_sndbuf < 0) {
 981                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 982                         return false;
 983                 }
 984
 985                 udp_sndbuf_warnings = true;
 986         }
 987
 988         get_config_int(lookup_config(config_tree, "FWMark"), &fwmark);
 989 #ifndef SO_MARK
 990
 991         if(fwmark) {
 992                 logger(DEBUG_ALWAYS, LOG_ERR, "FWMark not supported on this platform!");
 993                 return false;
 994         }
 995
 996 #endif
 997
 998         int replaywin_int;
 999
1000         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
1001                 if(replaywin_int < 0) {
1002                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
1003                         return false;
1004                 }
1005
1006                 replaywin = (unsigned)replaywin_int;
1007                 sptps_replaywin = replaywin;
1008         }
1009
1010 #ifndef DISABLE_LEGACY
1011         /* Generate packet encryption key */
1012
1013         char *cipher;
1014
1015         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher)) {
1016                 cipher = xstrdup("aes-256-cbc");
1017         }
1018
1019         if(!strcasecmp(cipher, "none")) {
1020                 myself->incipher = NULL;
1021         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
1022                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
1023                 free(cipher);
1024                 return false;
1025         }
1026
1027         free(cipher);
1028
1029         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval) {
1030                 keylifetime, rand() % 100000
1031         });
1032
1033         /* Check if we want to use message authentication codes... */
1034
1035         int maclength = 4;
1036         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
1037
1038         if(maclength < 0) {
1039                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
1040                 return false;
1041         }
1042
1043         char *digest;
1044
1045         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest)) {
1046                 digest = xstrdup("sha256");
1047         }
1048
1049         if(!strcasecmp(digest, "none")) {
1050                 myself->indigest = NULL;
1051         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
1052                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
1053                 free(digest);
1054                 return false;
1055         }
1056
1057         free(digest);
1058 #endif
1059
1060         /* Compression */
1061
1062         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
1063                 switch(myself->incompression) {
1064                 case 12:
1065 #ifdef HAVE_LZ4
1066                         break;
1067 #else
1068                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
1069                         logger(DEBUG_ALWAYS, LOG_ERR, "LZ4 compression is unavailable on this node.");
1070                         return false;
1071 #endif
1072
1073                 case 11:
1074                 case 10:
1075 #ifdef HAVE_LZO
1076                         break;
1077 #else
1078                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
1079                         logger(DEBUG_ALWAYS, LOG_ERR, "LZO compression is unavailable on this node.");
1080                         return false;
1081 #endif
1082
1083                 case 9:
1084                 case 8:
1085                 case 7:
1086                 case 6:
1087                 case 5:
1088                 case 4:
1089                 case 3:
1090                 case 2:
1091                 case 1:
1092 #ifdef HAVE_ZLIB
1093                         break;
1094 #else
1095                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
1096                         logger(DEBUG_ALWAYS, LOG_ERR, "ZLIB compression is unavailable on this node.");
1097                         return false;
1098 #endif
1099
1100                 case 0:
1101                         break;
1102
1103                 default:
1104                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
1105                         logger(DEBUG_ALWAYS, LOG_ERR, "Compression level %i is unrecognized by this node.", myself->incompression);
1106                         return false;
1107                 }
1108         } else {
1109                 myself->incompression = 0;
1110         }
1111
1112         myself->connection->outcompression = 0;
1113
1114         /* Done */
1115
1116         myself->nexthop = myself;
1117         myself->via = myself;
1118         myself->status.reachable = true;
1119         myself->last_state_change = now.tv_sec;
1120         myself->status.sptps = experimental;
1121         node_add(myself);
1122
1123         graph();
1124
1125         load_all_nodes();
1126
1127         /* Open device */
1128
1129         devops = os_devops;
1130
1131         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
1132                 if(!strcasecmp(type, "dummy")) {
1133                         devops = dummy_devops;
1134                 } else if(!strcasecmp(type, "raw_socket")) {
1135                         devops = raw_socket_devops;
1136                 } else if(!strcasecmp(type, "multicast")) {
1137                         devops = multicast_devops;
1138                 }
1139
1140 #ifdef HAVE_SYS_UN_H
1141                 else if(!strcasecmp(type, "fd")) {
1142                         devops = fd_devops;
1143                 }
1144
1145 #endif
1146 #ifdef ENABLE_UML
1147                 else if(!strcasecmp(type, "uml")) {
1148                         devops = uml_devops;
1149                 }
1150
1151 #endif
1152 #ifdef ENABLE_VDE
1153                 else if(!strcasecmp(type, "vde")) {
1154                         devops = vde_devops;
1155                 }
1156
1157 #endif
1158                 free(type);
1159         }
1160
1161         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
1162
1163         if(!devops.setup()) {
1164                 return false;
1165         }
1166
1167         if(device_fd >= 0) {
1168                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
1169         }
1170
1171         /* Open sockets */
1172
1173         if(!do_detach && getenv("LISTEN_FDS")) {
1174                 sockaddr_t sa;
1175                 socklen_t salen;
1176
1177                 listen_sockets = atoi(getenv("LISTEN_FDS"));
1178 #ifdef HAVE_UNSETENV
1179                 unsetenv("LISTEN_FDS");
1180 #endif
1181
1182                 if(listen_sockets > MAXSOCKETS) {
1183                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
1184                         return false;
1185                 }
1186
1187                 for(int i = 0; i < listen_sockets; i++) {
1188                         salen = sizeof(sa);
1189
1190                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
1191                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
1192                                 return false;
1193                         }
1194
1195 #ifdef FD_CLOEXEC
1196                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
1197 #endif
1198
1199                         int udp_fd = setup_vpn_in_socket(&sa);
1200
1201                         if(udp_fd < 0) {
1202                                 return false;
1203                         }
1204
1205                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
1206                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1207
1208                         if(debug_level >= DEBUG_CONNECTIONS) {
1209                                 hostname = sockaddr2hostname(&sa);
1210                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1211                                 free(hostname);
1212                         }
1213
1214                         memcpy(&listen_socket[i].sa, &sa, salen);
1215                 }
1216         } else {
1217                 listen_sockets = 0;
1218                 int cfgs = 0;
1219
1220                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1221                         cfgs++;
1222                         get_config_string(cfg, &address);
1223
1224                         if(!add_listen_address(address, true)) {
1225                                 return false;
1226                         }
1227                 }
1228
1229                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1230                         cfgs++;
1231                         get_config_string(cfg, &address);
1232
1233                         if(!add_listen_address(address, false)) {
1234                                 return false;
1235                         }
1236                 }
1237
1238                 if(!cfgs)
1239                         if(!add_listen_address(address, NULL)) {
1240                                 return false;
1241                         }
1242         }
1243
1244         if(!listen_sockets) {
1245                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1246                 return false;
1247         }
1248
1249         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1250
1251         if(!port_specified || atoi(myport) == 0) {
1252                 sockaddr_t sa;
1253                 socklen_t salen = sizeof(sa);
1254
1255                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1256                         free(myport);
1257                         sockaddr2str(&sa, NULL, &myport);
1258
1259                         if(!myport) {
1260                                 myport = xstrdup("655");
1261                         }
1262                 }
1263         }
1264
1265         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1266         myself->connection->hostname = xstrdup(myself->hostname);
1267
1268         char *upnp = NULL;
1269         get_config_string(lookup_config(config_tree, "UPnP"), &upnp);
1270         bool upnp_tcp = false;
1271         bool upnp_udp = false;
1272
1273         if(upnp) {
1274                 if(!strcasecmp(upnp, "yes")) {
1275                         upnp_tcp = upnp_udp = true;
1276                 } else if(!strcasecmp(upnp, "udponly")) {
1277                         upnp_udp = true;
1278                 }
1279
1280                 free(upnp);
1281         }
1282
1283         if(upnp_tcp || upnp_udp) {
1284 #ifdef HAVE_MINIUPNPC
1285                 upnp_init(upnp_tcp, upnp_udp);
1286 #else
1287                 logger(DEBUG_ALWAYS, LOG_WARNING, "UPnP was requested, but tinc isn't built with miniupnpc support!");
1288 #endif
1289         }
1290
1291         /* Done. */
1292
1293         last_config_check = now.tv_sec;
1294
1295         return true;
1296 }
1297
1298 /*
1299   initialize network
1300 */
1301 bool setup_network(void) {
1302         init_connections();
1303         init_subnets();
1304         init_nodes();
1305         init_edges();
1306         init_requests();
1307
1308         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1309                 if(pinginterval < 1) {
1310                         pinginterval = 86400;
1311                 }
1312         } else {
1313                 pinginterval = 60;
1314         }
1315
1316         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) {
1317                 pingtimeout = 5;
1318         }
1319
1320         if(pingtimeout < 1 || pingtimeout > pinginterval) {
1321                 pingtimeout = pinginterval;
1322         }
1323
1324         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize)) {
1325                 maxoutbufsize = 10 * MTU;
1326         }
1327
1328         if(!setup_myself()) {
1329                 return false;
1330         }
1331
1332         if(!init_control()) {
1333                 return false;
1334         }
1335
1336         if(!device_standby) {
1337                 device_enable();
1338         }
1339
1340         /* Run subnet-up scripts for our own subnets */
1341
1342         subnet_update(myself, NULL, true);
1343
1344         return true;
1345 }
1346
1347 /*
1348   close all open network connections
1349 */
1350 void close_network_connections(void) {
1351         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1352                 next = node->next;
1353                 connection_t *c = node->data;
1354
1355                 /* Keep control connections open until the end, so they know when we really terminated */
1356                 if(c->status.control) {
1357                         c->socket = -1;
1358                 }
1359
1360                 c->outgoing = NULL;
1361                 terminate_connection(c, false);
1362         }
1363
1364         if(outgoing_list) {
1365                 list_delete_list(outgoing_list);
1366         }
1367
1368         if(myself && myself->connection) {
1369                 subnet_update(myself, NULL, false);
1370                 free_connection(myself->connection);
1371         }
1372
1373         for(int i = 0; i < listen_sockets; i++) {
1374                 io_del(&listen_socket[i].tcp);
1375                 io_del(&listen_socket[i].udp);
1376                 close(listen_socket[i].tcp.fd);
1377                 close(listen_socket[i].udp.fd);
1378         }
1379
1380         exit_requests();
1381         exit_edges();
1382         exit_subnets();
1383         exit_nodes();
1384         exit_connections();
1385
1386         if(!device_standby) {
1387                 device_disable();
1388         }
1389
1390         free(myport);
1391
1392         if(device_fd >= 0) {
1393                 io_del(&device_io);
1394         }
1395
1396         if(devops.close) {
1397                 devops.close();
1398         }
1399
1400         exit_control();
1401
1402         free(scriptextension);
1403         free(scriptinterpreter);
1404
1405         return;
1406 }