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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2015 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 char *myport;
  47 static char *myname;
  48 static io_t device_io;
  49 devops_t devops;
  50 bool device_standby = false;
  51
  52 char *proxyhost;
  53 char *proxyport;
  54 char *proxyuser;
  55 char *proxypass;
  56 proxytype_t proxytype;
  57 bool autoconnect;
  58 bool disablebuggypeers;
  59
  60 char *scriptinterpreter;
  61 char *scriptextension;
  62
  63 bool node_read_ecdsa_public_key(node_t *n) {
  64         if(ecdsa_active(n->ecdsa))
  65                 return true;
  66
  67         splay_tree_t *config_tree;
  68         FILE *fp;
  69         char *pubname = NULL;
  70         char *p;
  71
  72         init_configuration(&config_tree);
  73         if(!read_host_config(config_tree, n->name))
  74                 goto exit;
  75
  76         /* First, check for simple Ed25519PublicKey statement */
  77
  78         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  79                 n->ecdsa = ecdsa_set_base64_public_key(p);
  80                 free(p);
  81                 goto exit;
  82         }
  83
  84         /* Else, check for Ed25519PublicKeyFile statement and read it */
  85
  86         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname))
  87                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  88
  89         fp = fopen(pubname, "r");
  90
  91         if(!fp)
  92                 goto exit;
  93
  94         n->ecdsa = ecdsa_read_pem_public_key(fp);
  95         fclose(fp);
  96
  97 exit:
  98         exit_configuration(&config_tree);
  99         free(pubname);
 100         return n->ecdsa;
 101 }
 102
 103 bool read_ecdsa_public_key(connection_t *c) {
 104         if(ecdsa_active(c->ecdsa))
 105                 return true;
 106
 107         FILE *fp;
 108         char *fname;
 109         char *p;
 110
 111         if(!c->config_tree) {
 112                 init_configuration(&c->config_tree);
 113                 if(!read_host_config(c->config_tree, c->name))
 114                         return false;
 115         }
 116
 117         /* First, check for simple Ed25519PublicKey statement */
 118
 119         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 120                 c->ecdsa = ecdsa_set_base64_public_key(p);
 121                 free(p);
 122                 return c->ecdsa;
 123         }
 124
 125         /* Else, check for Ed25519PublicKeyFile statement and read it */
 126
 127         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname))
 128                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 129
 130         fp = fopen(fname, "r");
 131
 132         if(!fp) {
 133                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
 134                            fname, strerror(errno));
 135                 free(fname);
 136                 return false;
 137         }
 138
 139         c->ecdsa = ecdsa_read_pem_public_key(fp);
 140
 141         if(!c->ecdsa && errno != ENOENT)
 142                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 143
 144         fclose(fp);
 145         free(fname);
 146         return c->ecdsa;
 147 }
 148
 149 #ifndef DISABLE_LEGACY
 150 bool read_rsa_public_key(connection_t *c) {
 151         FILE *fp;
 152         char *fname;
 153         char *n;
 154
 155         /* First, check for simple PublicKey statement */
 156
 157         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 158                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 159                 free(n);
 160                 return c->rsa;
 161         }
 162
 163         /* Else, check for PublicKeyFile statement and read it */
 164
 165         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 166                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 167
 168         fp = fopen(fname, "r");
 169
 170         if(!fp) {
 171                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 172                 free(fname);
 173                 return false;
 174         }
 175
 176         c->rsa = rsa_read_pem_public_key(fp);
 177         fclose(fp);
 178
 179         if(!c->rsa)
 180                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 181         free(fname);
 182         return c->rsa;
 183 }
 184 #endif
 185
 186 static bool read_ecdsa_private_key(void) {
 187         FILE *fp;
 188         char *fname;
 189
 190         /* Check for PrivateKeyFile statement and read it */
 191
 192         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname))
 193                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 194
 195         fp = fopen(fname, "r");
 196
 197         if(!fp) {
 198                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 199                 if(errno == ENOENT)
 200                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ?: ".");
 201                 free(fname);
 202                 return false;
 203         }
 204
 205 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 206         struct stat s;
 207
 208         if(fstat(fileno(fp), &s)) {
 209                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 210                 free(fname);
 211                 return false;
 212         }
 213
 214         if(s.st_mode & ~0100700)
 215                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 216 #endif
 217
 218         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 219         fclose(fp);
 220
 221         if(!myself->connection->ecdsa)
 222                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 223         free(fname);
 224         return myself->connection->ecdsa;
 225 }
 226
 227 static bool read_invitation_key(void) {
 228         FILE *fp;
 229         char fname[PATH_MAX];
 230
 231         if(invitation_key) {
 232                 ecdsa_free(invitation_key);
 233                 invitation_key = NULL;
 234         }
 235
 236         snprintf(fname, sizeof fname, "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 237
 238         fp = fopen(fname, "r");
 239
 240         if(fp) {
 241                 invitation_key = ecdsa_read_pem_private_key(fp);
 242                 fclose(fp);
 243                 if(!invitation_key)
 244                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 245         }
 246
 247         return invitation_key;
 248 }
 249
 250 #ifndef DISABLE_LEGACY
 251 static bool read_rsa_private_key(void) {
 252         FILE *fp;
 253         char *fname;
 254         char *n, *d;
 255
 256         /* First, check for simple PrivateKey statement */
 257
 258         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 259                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 260                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 261                         free(d);
 262                         return false;
 263                 }
 264                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 265                 free(n);
 266                 free(d);
 267                 return myself->connection->rsa;
 268         }
 269
 270         /* Else, check for PrivateKeyFile statement and read it */
 271
 272         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 273                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 274
 275         fp = fopen(fname, "r");
 276
 277         if(!fp) {
 278                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 279                            fname, strerror(errno));
 280                 if(errno == ENOENT)
 281                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an RSA keypair with `tinc -n %s generate-rsa-keys'.", netname ?: ".");
 282                 free(fname);
 283                 return false;
 284         }
 285
 286 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 287         struct stat s;
 288
 289         if(fstat(fileno(fp), &s)) {
 290                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 291                 free(fname);
 292                 return false;
 293         }
 294
 295         if(s.st_mode & ~0100700)
 296                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 297 #endif
 298
 299         myself->connection->rsa = rsa_read_pem_private_key(fp);
 300         fclose(fp);
 301
 302         if(!myself->connection->rsa)
 303                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 304         free(fname);
 305         return myself->connection->rsa;
 306 }
 307 #endif
 308
 309 static timeout_t keyexpire_timeout;
 310
 311 static void keyexpire_handler(void *data) {
 312         regenerate_key();
 313         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 314 }
 315
 316 void regenerate_key(void) {
 317         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 318         send_key_changed();
 319         for splay_each(node_t, n, node_tree)
 320                 n->status.validkey_in = false;
 321 }
 322
 323 /*
 324   Read Subnets from all host config files
 325 */
 326 void load_all_subnets(void) {
 327         DIR *dir;
 328         struct dirent *ent;
 329         char dname[PATH_MAX];
 330
 331         snprintf(dname, sizeof dname, "%s" SLASH "hosts", confbase);
 332         dir = opendir(dname);
 333         if(!dir) {
 334                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 335                 return;
 336         }
 337
 338         while((ent = readdir(dir))) {
 339                 if(!check_id(ent->d_name))
 340                         continue;
 341
 342                 node_t *n = lookup_node(ent->d_name);
 343                 #ifdef _DIRENT_HAVE_D_TYPE
 344                 //if(ent->d_type != DT_REG)
 345                 //      continue;
 346                 #endif
 347
 348                 splay_tree_t *config_tree;
 349                 init_configuration(&config_tree);
 350                 read_config_options(config_tree, ent->d_name);
 351                 read_host_config(config_tree, ent->d_name);
 352
 353                 if(!n) {
 354                         n = new_node();
 355                         n->name = xstrdup(ent->d_name);
 356                         node_add(n);
 357                 }
 358
 359                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 360                         subnet_t *s, *s2;
 361
 362                         if(!get_config_subnet(cfg, &s))
 363                                 continue;
 364
 365                         if((s2 = lookup_subnet(n, s))) {
 366                                 s2->expires = -1;
 367                         } else {
 368                                 subnet_add(n, s);
 369                         }
 370                 }
 371
 372                 exit_configuration(&config_tree);
 373         }
 374
 375         closedir(dir);
 376 }
 377
 378 void load_all_nodes(void) {
 379         DIR *dir;
 380         struct dirent *ent;
 381         char dname[PATH_MAX];
 382
 383         snprintf(dname, sizeof dname, "%s" SLASH "hosts", confbase);
 384         dir = opendir(dname);
 385         if(!dir) {
 386                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 387                 return;
 388         }
 389
 390         while((ent = readdir(dir))) {
 391                 if(!check_id(ent->d_name))
 392                         continue;
 393
 394                 node_t *n = lookup_node(ent->d_name);
 395                 if(n)
 396                         continue;
 397
 398                 n = new_node();
 399                 n->name = xstrdup(ent->d_name);
 400                 node_add(n);
 401         }
 402
 403         closedir(dir);
 404 }
 405
 406
 407 char *get_name(void) {
 408         char *name = NULL;
 409         char *returned_name;
 410
 411         get_config_string(lookup_config(config_tree, "Name"), &name);
 412
 413         if(!name)
 414                 return NULL;
 415
 416         returned_name = replace_name(name);
 417         free(name);
 418         return returned_name;
 419 }
 420
 421 bool setup_myself_reloadable(void) {
 422         char *proxy = NULL;
 423         char *rmode = NULL;
 424         char *fmode = NULL;
 425         char *bmode = NULL;
 426         char *afname = NULL;
 427         char *space;
 428         bool choice;
 429
 430         free(scriptinterpreter);
 431         scriptinterpreter = NULL;
 432         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 433
 434
 435         free(scriptextension);
 436         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 437                 scriptextension = xstrdup("");
 438
 439         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 440         if(proxy) {
 441                 if((space = strchr(proxy, ' ')))
 442                         *space++ = 0;
 443
 444                 if(!strcasecmp(proxy, "none")) {
 445                         proxytype = PROXY_NONE;
 446                 } else if(!strcasecmp(proxy, "socks4")) {
 447                         proxytype = PROXY_SOCKS4;
 448                 } else if(!strcasecmp(proxy, "socks4a")) {
 449                         proxytype = PROXY_SOCKS4A;
 450                 } else if(!strcasecmp(proxy, "socks5")) {
 451                         proxytype = PROXY_SOCKS5;
 452                 } else if(!strcasecmp(proxy, "http")) {
 453                         proxytype = PROXY_HTTP;
 454                 } else if(!strcasecmp(proxy, "exec")) {
 455                         proxytype = PROXY_EXEC;
 456                 } else {
 457                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 458                         return false;
 459                 }
 460
 461                 switch(proxytype) {
 462                         case PROXY_NONE:
 463                         default:
 464                                 break;
 465
 466                         case PROXY_EXEC:
 467                                 if(!space || !*space) {
 468                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 469                                         return false;
 470                                 }
 471                                 proxyhost =  xstrdup(space);
 472                                 break;
 473
 474                         case PROXY_SOCKS4:
 475                         case PROXY_SOCKS4A:
 476                         case PROXY_SOCKS5:
 477                         case PROXY_HTTP:
 478                                 proxyhost = space;
 479                                 if(space && (space = strchr(space, ' ')))
 480                                         *space++ = 0, proxyport = space;
 481                                 if(space && (space = strchr(space, ' ')))
 482                                         *space++ = 0, proxyuser = space;
 483                                 if(space && (space = strchr(space, ' ')))
 484                                         *space++ = 0, proxypass = space;
 485                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 486                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 487                                         return false;
 488                                 }
 489                                 proxyhost = xstrdup(proxyhost);
 490                                 proxyport = xstrdup(proxyport);
 491                                 if(proxyuser && *proxyuser)
 492                                         proxyuser = xstrdup(proxyuser);
 493                                 if(proxypass && *proxypass)
 494                                         proxypass = xstrdup(proxypass);
 495                                 break;
 496                 }
 497
 498                 free(proxy);
 499         }
 500
 501         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 502                 myself->options |= OPTION_INDIRECT;
 503
 504         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 505                 myself->options |= OPTION_TCPONLY;
 506
 507         if(myself->options & OPTION_TCPONLY)
 508                 myself->options |= OPTION_INDIRECT;
 509
 510         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
 511         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 512         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 513         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 514
 515         get_config_int(lookup_config(config_tree, "MTUInfoInterval"), &mtu_info_interval);
 516         get_config_int(lookup_config(config_tree, "UDPInfoInterval"), &udp_info_interval);
 517
 518         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 519         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 520
 521         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 522                 if(!strcasecmp(rmode, "router"))
 523                         routing_mode = RMODE_ROUTER;
 524                 else if(!strcasecmp(rmode, "switch"))
 525                         routing_mode = RMODE_SWITCH;
 526                 else if(!strcasecmp(rmode, "hub"))
 527                         routing_mode = RMODE_HUB;
 528                 else {
 529                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 530                         return false;
 531                 }
 532                 free(rmode);
 533         }
 534
 535         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 536                 if(!strcasecmp(fmode, "off"))
 537                         forwarding_mode = FMODE_OFF;
 538                 else if(!strcasecmp(fmode, "internal"))
 539                         forwarding_mode = FMODE_INTERNAL;
 540                 else if(!strcasecmp(fmode, "kernel"))
 541                         forwarding_mode = FMODE_KERNEL;
 542                 else {
 543                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 544                         return false;
 545                 }
 546                 free(fmode);
 547         }
 548
 549         choice = true;
 550         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 551         if(choice)
 552                 myself->options |= OPTION_PMTU_DISCOVERY;
 553
 554         choice = true;
 555         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 556         if(choice)
 557                 myself->options |= OPTION_CLAMP_MSS;
 558
 559         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 560         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 561         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 562                 if(!strcasecmp(bmode, "no"))
 563                         broadcast_mode = BMODE_NONE;
 564                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 565                         broadcast_mode = BMODE_MST;
 566                 else if(!strcasecmp(bmode, "direct"))
 567                         broadcast_mode = BMODE_DIRECT;
 568                 else {
 569                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 570                         return false;
 571                 }
 572                 free(bmode);
 573         }
 574
 575         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 576         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 577                 subnet_t *s = new_subnet();
 578                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
 579                         abort();
 580                 subnet_add(NULL, s);
 581         }
 582         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 583                 subnet_t *s;
 584                 if (!get_config_subnet(cfg, &s))
 585                         continue;
 586                 subnet_add(NULL, s);
 587         }
 588
 589 #if !defined(SOL_IP) || !defined(IP_TOS)
 590         if(priorityinheritance)
 591                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 592 #endif
 593
 594         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 595                 macexpire = 600;
 596
 597         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 598                 if(maxtimeout <= 0) {
 599                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 600                         return false;
 601                 }
 602         } else
 603                 maxtimeout = 900;
 604
 605         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 606                 if(!strcasecmp(afname, "IPv4"))
 607                         addressfamily = AF_INET;
 608                 else if(!strcasecmp(afname, "IPv6"))
 609                         addressfamily = AF_INET6;
 610                 else if(!strcasecmp(afname, "any"))
 611                         addressfamily = AF_UNSPEC;
 612                 else {
 613                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 614                         return false;
 615                 }
 616                 free(afname);
 617         }
 618
 619         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 620
 621         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 622                 keylifetime = 3600;
 623
 624         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 625         if(cfg) {
 626                 if(!get_config_bool(cfg, &autoconnect)) {
 627                         // Some backwards compatibility with when this option was an int
 628                         int val = 0;
 629                         get_config_int(cfg, &val);
 630                         autoconnect = val;
 631                 }
 632         }
 633
 634         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 635
 636         read_invitation_key();
 637
 638         return true;
 639 }
 640
 641 /*
 642   Add listening sockets.
 643 */
 644 static bool add_listen_address(char *address, bool bindto) {
 645         char *port = myport;
 646
 647         if(address) {
 648                 char *space = strchr(address, ' ');
 649                 if(space) {
 650                         *space++ = 0;
 651                         port = space;
 652                 }
 653
 654                 if(!strcmp(address, "*"))
 655                         *address = 0;
 656         }
 657
 658         struct addrinfo *ai, hint = {0};
 659         hint.ai_family = addressfamily;
 660         hint.ai_socktype = SOCK_STREAM;
 661         hint.ai_protocol = IPPROTO_TCP;
 662         hint.ai_flags = AI_PASSIVE;
 663
 664 #if HAVE_DECL_RES_INIT
 665         res_init();
 666 #endif
 667         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 668         free(address);
 669
 670         if(err || !ai) {
 671                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 672                 return false;
 673         }
 674
 675         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 676                 // Ignore duplicate addresses
 677                 bool found = false;
 678
 679                 for(int i = 0; i < listen_sockets; i++)
 680                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 681                                 found = true;
 682                                 break;
 683                         }
 684
 685                 if(found)
 686                         continue;
 687
 688                 if(listen_sockets >= MAXSOCKETS) {
 689                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 690                         return false;
 691                 }
 692
 693                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 694
 695                 if(tcp_fd < 0)
 696                         continue;
 697
 698                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 699
 700                 if(tcp_fd < 0) {
 701                         close(tcp_fd);
 702                         continue;
 703                 }
 704
 705                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 706                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 707
 708                 if(debug_level >= DEBUG_CONNECTIONS) {
 709                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 710                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 711                         free(hostname);
 712                 }
 713
 714                 listen_socket[listen_sockets].bindto = bindto;
 715                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 716                 listen_sockets++;
 717         }
 718
 719         freeaddrinfo(ai);
 720         return true;
 721 }
 722
 723 void device_enable(void) {
 724         if (devops.enable)
 725                 devops.enable();
 726
 727         /* Run tinc-up script to further initialize the tap interface */
 728
 729         char *envp[5] = {NULL};
 730         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 731         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 732         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 733         xasprintf(&envp[3], "NAME=%s", myname);
 734
 735         execute_script("tinc-up", envp);
 736
 737         for(int i = 0; i < 4; i++)
 738                 free(envp[i]);
 739 }
 740
 741 void device_disable(void) {
 742         char *envp[5] = {NULL};
 743         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 744         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 745         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 746         xasprintf(&envp[3], "NAME=%s", myname);
 747
 748         execute_script("tinc-down", envp);
 749
 750         for(int i = 0; i < 4; i++)
 751                 free(envp[i]);
 752
 753         if (devops.disable)
 754                 devops.disable();
 755 }
 756
 757 /*
 758   Configure node_t myself and set up the local sockets (listen only)
 759 */
 760 static bool setup_myself(void) {
 761         char *name, *hostname, *cipher, *digest, *type;
 762         char *address = NULL;
 763         bool port_specified = false;
 764
 765         if(!(name = get_name())) {
 766                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 767                 return false;
 768         }
 769
 770         myname = xstrdup(name);
 771         myself = new_node();
 772         myself->connection = new_connection();
 773         myself->name = name;
 774         myself->connection->name = xstrdup(name);
 775         read_host_config(config_tree, name);
 776
 777         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 778                 myport = xstrdup("655");
 779         else
 780                 port_specified = true;
 781
 782         myself->connection->options = 0;
 783         myself->connection->protocol_major = PROT_MAJOR;
 784         myself->connection->protocol_minor = PROT_MINOR;
 785
 786         myself->options |= PROT_MINOR << 24;
 787
 788 #ifdef DISABLE_LEGACY
 789         experimental = read_ecdsa_private_key();
 790         if(!experimental) {
 791                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 792                 return false;
 793         }
 794 #else
 795         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 796                 experimental = read_ecdsa_private_key();
 797                 if(!experimental)
 798                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 799         } else {
 800                 if(experimental && !read_ecdsa_private_key())
 801                         return false;
 802         }
 803
 804         if(!read_rsa_private_key()) {
 805                 if(experimental) {
 806                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 807                 } else {
 808                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 809                         return false;
 810                 }
 811         }
 812 #endif
 813
 814         /* Ensure myport is numeric */
 815
 816         if(!atoi(myport)) {
 817                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 818                 sockaddr_t sa;
 819                 if(!ai || !ai->ai_addr)
 820                         return false;
 821                 free(myport);
 822                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 823                 sockaddr2str(&sa, NULL, &myport);
 824         }
 825
 826         /* Read in all the subnets specified in the host configuration file */
 827
 828         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 829                 subnet_t *subnet;
 830
 831                 if(!get_config_subnet(cfg, &subnet))
 832                         return false;
 833
 834                 subnet_add(myself, subnet);
 835         }
 836
 837         /* Check some options */
 838
 839         if(!setup_myself_reloadable())
 840                 return false;
 841
 842         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 843         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 844         strictsubnets |= tunnelserver;
 845
 846         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 847                 if(max_connection_burst <= 0) {
 848                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 849                         return false;
 850                 }
 851         }
 852
 853         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 854                 if(udp_rcvbuf < 0) {
 855                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 856                         return false;
 857                 }
 858         }
 859
 860         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 861                 if(udp_sndbuf < 0) {
 862                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 863                         return false;
 864                 }
 865         }
 866
 867         int replaywin_int;
 868         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 869                 if(replaywin_int < 0) {
 870                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 871                         return false;
 872                 }
 873                 replaywin = (unsigned)replaywin_int;
 874                 sptps_replaywin = replaywin;
 875         }
 876
 877 #ifndef DISABLE_LEGACY
 878         /* Generate packet encryption key */
 879
 880         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 881                 cipher = xstrdup("blowfish");
 882
 883         if(!strcasecmp(cipher, "none")) {
 884                 myself->incipher = NULL;
 885         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 886                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 887                 return false;
 888         }
 889
 890         free(cipher);
 891
 892         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 893
 894         /* Check if we want to use message authentication codes... */
 895
 896         int maclength = 4;
 897         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 898
 899         if(maclength < 0) {
 900                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 901                 return false;
 902         }
 903
 904         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 905                 digest = xstrdup("sha1");
 906
 907         if(!strcasecmp(digest, "none")) {
 908                 myself->indigest = NULL;
 909         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 910                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 911                 return false;
 912         }
 913
 914         free(digest);
 915 #endif
 916
 917         /* Compression */
 918
 919         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 920                 if(myself->incompression < 0 || myself->incompression > 11) {
 921                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 922                         return false;
 923                 }
 924         } else
 925                 myself->incompression = 0;
 926
 927         myself->connection->outcompression = 0;
 928
 929         /* Done */
 930
 931         myself->nexthop = myself;
 932         myself->via = myself;
 933         myself->status.reachable = true;
 934         myself->last_state_change = now.tv_sec;
 935         myself->status.sptps = experimental;
 936         node_add(myself);
 937
 938         graph();
 939
 940         if(strictsubnets)
 941                 load_all_subnets();
 942         else if(autoconnect)
 943                 load_all_nodes();
 944
 945         /* Open device */
 946
 947         devops = os_devops;
 948
 949         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 950                 if(!strcasecmp(type, "dummy"))
 951                         devops = dummy_devops;
 952                 else if(!strcasecmp(type, "raw_socket"))
 953                         devops = raw_socket_devops;
 954                 else if(!strcasecmp(type, "multicast"))
 955                         devops = multicast_devops;
 956 #ifdef ENABLE_UML
 957                 else if(!strcasecmp(type, "uml"))
 958                         devops = uml_devops;
 959 #endif
 960 #ifdef ENABLE_VDE
 961                 else if(!strcasecmp(type, "vde"))
 962                         devops = vde_devops;
 963 #endif
 964         }
 965
 966         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 967
 968         if(!devops.setup())
 969                 return false;
 970
 971         if(device_fd >= 0)
 972                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 973
 974         /* Open sockets */
 975
 976         if(!do_detach && getenv("LISTEN_FDS")) {
 977                 sockaddr_t sa;
 978                 socklen_t salen;
 979
 980                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 981 #ifdef HAVE_UNSETENV
 982                 unsetenv("LISTEN_FDS");
 983 #endif
 984
 985                 if(listen_sockets > MAXSOCKETS) {
 986                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 987                         return false;
 988                 }
 989
 990                 for(int i = 0; i < listen_sockets; i++) {
 991                         salen = sizeof sa;
 992                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 993                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 994                                 return false;
 995                         }
 996
 997 #ifdef FD_CLOEXEC
 998                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 999 #endif
1000
1001                         int udp_fd = setup_vpn_in_socket(&sa);
1002                         if(udp_fd < 0)
1003                                 return false;
1004
1005                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
1006                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1007
1008                         if(debug_level >= DEBUG_CONNECTIONS) {
1009                                 hostname = sockaddr2hostname(&sa);
1010                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1011                                 free(hostname);
1012                         }
1013
1014                         memcpy(&listen_socket[i].sa, &sa, salen);
1015                 }
1016         } else {
1017                 listen_sockets = 0;
1018                 int cfgs = 0;
1019
1020                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1021                         cfgs++;
1022                         get_config_string(cfg, &address);
1023                         if(!add_listen_address(address, true))
1024                                 return false;
1025                 }
1026
1027                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1028                         cfgs++;
1029                         get_config_string(cfg, &address);
1030                         if(!add_listen_address(address, false))
1031                                 return false;
1032                 }
1033
1034                 if(!cfgs)
1035                         if(!add_listen_address(address, NULL))
1036                                 return false;
1037         }
1038
1039         if(!listen_sockets) {
1040                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1041                 return false;
1042         }
1043
1044         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1045
1046         if(!port_specified || atoi(myport) == 0) {
1047                 sockaddr_t sa;
1048                 socklen_t salen = sizeof sa;
1049                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1050                         free(myport);
1051                         sockaddr2str(&sa, NULL, &myport);
1052                         if(!myport)
1053                                 myport = xstrdup("655");
1054                 }
1055         }
1056
1057         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1058         myself->connection->hostname = xstrdup(myself->hostname);
1059
1060         /* Done. */
1061
1062         last_config_check = now.tv_sec;
1063
1064         return true;
1065 }
1066
1067 /*
1068   initialize network
1069 */
1070 bool setup_network(void) {
1071         init_connections();
1072         init_subnets();
1073         init_nodes();
1074         init_edges();
1075         init_requests();
1076
1077         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1078                 if(pinginterval < 1) {
1079                         pinginterval = 86400;
1080                 }
1081         } else
1082                 pinginterval = 60;
1083
1084         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1085                 pingtimeout = 5;
1086         if(pingtimeout < 1 || pingtimeout > pinginterval)
1087                 pingtimeout = pinginterval;
1088
1089         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1090                 maxoutbufsize = 10 * MTU;
1091
1092         if(!setup_myself())
1093                 return false;
1094
1095         if(!init_control())
1096                 return false;
1097
1098         if (!device_standby)
1099                 device_enable();
1100
1101         /* Run subnet-up scripts for our own subnets */
1102
1103         subnet_update(myself, NULL, true);
1104
1105         return true;
1106 }
1107
1108 /*
1109   close all open network connections
1110 */
1111 void close_network_connections(void) {
1112         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1113                 next = node->next;
1114                 connection_t *c = node->data;
1115                 /* Keep control connections open until the end, so they know when we really terminated */
1116                 if(c->status.control)
1117                         c->socket = -1;
1118                 c->outgoing = NULL;
1119                 terminate_connection(c, false);
1120         }
1121
1122         if(outgoing_list)
1123                 list_delete_list(outgoing_list);
1124
1125         if(myself && myself->connection) {
1126                 subnet_update(myself, NULL, false);
1127                 terminate_connection(myself->connection, false);
1128                 free_connection(myself->connection);
1129         }
1130
1131         for(int i = 0; i < listen_sockets; i++) {
1132                 io_del(&listen_socket[i].tcp);
1133                 io_del(&listen_socket[i].udp);
1134                 close(listen_socket[i].tcp.fd);
1135                 close(listen_socket[i].udp.fd);
1136         }
1137
1138         exit_requests();
1139         exit_edges();
1140         exit_subnets();
1141         exit_nodes();
1142         exit_connections();
1143
1144         if (!device_standby)
1145                 device_disable();
1146
1147         free(myport);
1148
1149         if (device_fd >= 0)
1150                 io_del(&device_io);
1151         if (devops.close)
1152                 devops.close();
1153
1154         exit_control();
1155
1156         free(myname);
1157         free(scriptextension);
1158         free(scriptinterpreter);
1159
1160         return;
1161 }