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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2014 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         if(ecdsa_active(c->ecdsa))
 152                 return true;
 153
 154         FILE *fp;
 155         char *fname;
 156         char *n;
 157
 158         /* First, check for simple PublicKey statement */
 159
 160         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 161                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 162                 free(n);
 163                 return c->rsa;
 164         }
 165
 166         /* Else, check for PublicKeyFile statement and read it */
 167
 168         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 169                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 170
 171         fp = fopen(fname, "r");
 172
 173         if(!fp) {
 174                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 175                 free(fname);
 176                 return false;
 177         }
 178
 179         c->rsa = rsa_read_pem_public_key(fp);
 180         fclose(fp);
 181
 182         if(!c->rsa)
 183                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 184         free(fname);
 185         return c->rsa;
 186 }
 187 #endif
 188
 189 static bool read_ecdsa_private_key(void) {
 190         FILE *fp;
 191         char *fname;
 192
 193         /* Check for PrivateKeyFile statement and read it */
 194
 195         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname))
 196                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 197
 198         fp = fopen(fname, "r");
 199
 200         if(!fp) {
 201                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 202                 if(errno == ENOENT)
 203                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ?: ".");
 204                 free(fname);
 205                 return false;
 206         }
 207
 208 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 209         struct stat s;
 210
 211         if(fstat(fileno(fp), &s)) {
 212                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 213                 free(fname);
 214                 return false;
 215         }
 216
 217         if(s.st_mode & ~0100700)
 218                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 219 #endif
 220
 221         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 222         fclose(fp);
 223
 224         if(!myself->connection->ecdsa)
 225                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 226         free(fname);
 227         return myself->connection->ecdsa;
 228 }
 229
 230 static bool read_invitation_key(void) {
 231         FILE *fp;
 232         char *fname;
 233
 234         if(invitation_key) {
 235                 ecdsa_free(invitation_key);
 236                 invitation_key = NULL;
 237         }
 238
 239         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 240
 241         fp = fopen(fname, "r");
 242
 243         if(fp) {
 244                 invitation_key = ecdsa_read_pem_private_key(fp);
 245                 fclose(fp);
 246                 if(!invitation_key)
 247                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 248         }
 249
 250         free(fname);
 251         return invitation_key;
 252 }
 253
 254 #ifndef DISABLE_LEGACY
 255 static bool read_rsa_private_key(void) {
 256         FILE *fp;
 257         char *fname;
 258         char *n, *d;
 259
 260         /* First, check for simple PrivateKey statement */
 261
 262         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 263                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 264                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 265                         free(d);
 266                         return false;
 267                 }
 268                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 269                 free(n);
 270                 free(d);
 271                 return myself->connection->rsa;
 272         }
 273
 274         /* Else, check for PrivateKeyFile statement and read it */
 275
 276         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 277                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 278
 279         fp = fopen(fname, "r");
 280
 281         if(!fp) {
 282                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 283                            fname, strerror(errno));
 284                 if(errno == ENOENT)
 285                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an RSA keypair with `tinc -n %s generate-rsa-keys'.", netname ?: ".");
 286                 free(fname);
 287                 return false;
 288         }
 289
 290 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 291         struct stat s;
 292
 293         if(fstat(fileno(fp), &s)) {
 294                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 295                 free(fname);
 296                 return false;
 297         }
 298
 299         if(s.st_mode & ~0100700)
 300                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 301 #endif
 302
 303         myself->connection->rsa = rsa_read_pem_private_key(fp);
 304         fclose(fp);
 305
 306         if(!myself->connection->rsa)
 307                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 308         free(fname);
 309         return myself->connection->rsa;
 310 }
 311 #endif
 312
 313 static timeout_t keyexpire_timeout;
 314
 315 static void keyexpire_handler(void *data) {
 316         regenerate_key();
 317         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 318 }
 319
 320 void regenerate_key(void) {
 321         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 322         send_key_changed();
 323         for splay_each(node_t, n, node_tree)
 324                 n->status.validkey_in = false;
 325 }
 326
 327 /*
 328   Read Subnets from all host config files
 329 */
 330 void load_all_subnets(void) {
 331         DIR *dir;
 332         struct dirent *ent;
 333         char *dname;
 334
 335         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 336         dir = opendir(dname);
 337         if(!dir) {
 338                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 339                 free(dname);
 340                 return;
 341         }
 342
 343         while((ent = readdir(dir))) {
 344                 if(!check_id(ent->d_name))
 345                         continue;
 346
 347                 node_t *n = lookup_node(ent->d_name);
 348                 #ifdef _DIRENT_HAVE_D_TYPE
 349                 //if(ent->d_type != DT_REG)
 350                 //      continue;
 351                 #endif
 352
 353                 splay_tree_t *config_tree;
 354                 init_configuration(&config_tree);
 355                 read_config_options(config_tree, ent->d_name);
 356                 read_host_config(config_tree, ent->d_name);
 357
 358                 if(!n) {
 359                         n = new_node();
 360                         n->name = xstrdup(ent->d_name);
 361                         node_add(n);
 362                 }
 363
 364                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 365                         subnet_t *s, *s2;
 366
 367                         if(!get_config_subnet(cfg, &s))
 368                                 continue;
 369
 370                         if((s2 = lookup_subnet(n, s))) {
 371                                 s2->expires = -1;
 372                         } else {
 373                                 subnet_add(n, s);
 374                         }
 375                 }
 376
 377                 exit_configuration(&config_tree);
 378         }
 379
 380         closedir(dir);
 381 }
 382
 383 void load_all_nodes(void) {
 384         DIR *dir;
 385         struct dirent *ent;
 386         char *dname;
 387
 388         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 389         dir = opendir(dname);
 390         if(!dir) {
 391                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 392                 free(dname);
 393                 return;
 394         }
 395
 396         while((ent = readdir(dir))) {
 397                 if(!check_id(ent->d_name))
 398                         continue;
 399
 400                 node_t *n = lookup_node(ent->d_name);
 401                 if(n)
 402                         continue;
 403
 404                 n = new_node();
 405                 n->name = xstrdup(ent->d_name);
 406                 node_add(n);
 407         }
 408
 409         closedir(dir);
 410 }
 411
 412
 413 char *get_name(void) {
 414         char *name = NULL;
 415         char *returned_name;
 416
 417         get_config_string(lookup_config(config_tree, "Name"), &name);
 418
 419         if(!name)
 420                 return NULL;
 421
 422         returned_name = replace_name(name);
 423         free(name);
 424         return returned_name;
 425 }
 426
 427 bool setup_myself_reloadable(void) {
 428         char *proxy = NULL;
 429         char *rmode = NULL;
 430         char *fmode = NULL;
 431         char *bmode = NULL;
 432         char *afname = NULL;
 433         char *space;
 434         bool choice;
 435
 436         free(scriptinterpreter);
 437         scriptinterpreter = NULL;
 438         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 439
 440
 441         free(scriptextension);
 442         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 443                 scriptextension = xstrdup("");
 444
 445         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 446         if(proxy) {
 447                 if((space = strchr(proxy, ' ')))
 448                         *space++ = 0;
 449
 450                 if(!strcasecmp(proxy, "none")) {
 451                         proxytype = PROXY_NONE;
 452                 } else if(!strcasecmp(proxy, "socks4")) {
 453                         proxytype = PROXY_SOCKS4;
 454                 } else if(!strcasecmp(proxy, "socks4a")) {
 455                         proxytype = PROXY_SOCKS4A;
 456                 } else if(!strcasecmp(proxy, "socks5")) {
 457                         proxytype = PROXY_SOCKS5;
 458                 } else if(!strcasecmp(proxy, "http")) {
 459                         proxytype = PROXY_HTTP;
 460                 } else if(!strcasecmp(proxy, "exec")) {
 461                         proxytype = PROXY_EXEC;
 462                 } else {
 463                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 464                         return false;
 465                 }
 466
 467                 switch(proxytype) {
 468                         case PROXY_NONE:
 469                         default:
 470                                 break;
 471
 472                         case PROXY_EXEC:
 473                                 if(!space || !*space) {
 474                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 475                                         return false;
 476                                 }
 477                                 proxyhost =  xstrdup(space);
 478                                 break;
 479
 480                         case PROXY_SOCKS4:
 481                         case PROXY_SOCKS4A:
 482                         case PROXY_SOCKS5:
 483                         case PROXY_HTTP:
 484                                 proxyhost = space;
 485                                 if(space && (space = strchr(space, ' ')))
 486                                         *space++ = 0, proxyport = space;
 487                                 if(space && (space = strchr(space, ' ')))
 488                                         *space++ = 0, proxyuser = space;
 489                                 if(space && (space = strchr(space, ' ')))
 490                                         *space++ = 0, proxypass = space;
 491                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 492                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 493                                         return false;
 494                                 }
 495                                 proxyhost = xstrdup(proxyhost);
 496                                 proxyport = xstrdup(proxyport);
 497                                 if(proxyuser && *proxyuser)
 498                                         proxyuser = xstrdup(proxyuser);
 499                                 if(proxypass && *proxypass)
 500                                         proxypass = xstrdup(proxypass);
 501                                 break;
 502                 }
 503
 504                 free(proxy);
 505         }
 506
 507         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 508                 myself->options |= OPTION_INDIRECT;
 509
 510         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 511                 myself->options |= OPTION_TCPONLY;
 512
 513         if(myself->options & OPTION_TCPONLY)
 514                 myself->options |= OPTION_INDIRECT;
 515
 516         get_config_bool(lookup_config(config_tree, "UDPDiscovery"), &udp_discovery);
 517         get_config_int(lookup_config(config_tree, "UDPDiscoveryKeepaliveInterval"), &udp_discovery_keepalive_interval);
 518         get_config_int(lookup_config(config_tree, "UDPDiscoveryInterval"), &udp_discovery_interval);
 519         get_config_int(lookup_config(config_tree, "UDPDiscoveryTimeout"), &udp_discovery_timeout);
 520
 521         get_config_int(lookup_config(config_tree, "UDPInfoInterval"), &udp_info_interval);
 522
 523         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 524         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 525
 526         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 527                 if(!strcasecmp(rmode, "router"))
 528                         routing_mode = RMODE_ROUTER;
 529                 else if(!strcasecmp(rmode, "switch"))
 530                         routing_mode = RMODE_SWITCH;
 531                 else if(!strcasecmp(rmode, "hub"))
 532                         routing_mode = RMODE_HUB;
 533                 else {
 534                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 535                         return false;
 536                 }
 537                 free(rmode);
 538         }
 539
 540         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 541                 if(!strcasecmp(fmode, "off"))
 542                         forwarding_mode = FMODE_OFF;
 543                 else if(!strcasecmp(fmode, "internal"))
 544                         forwarding_mode = FMODE_INTERNAL;
 545                 else if(!strcasecmp(fmode, "kernel"))
 546                         forwarding_mode = FMODE_KERNEL;
 547                 else {
 548                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 549                         return false;
 550                 }
 551                 free(fmode);
 552         }
 553
 554         choice = true;
 555         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 556         if(choice)
 557                 myself->options |= OPTION_PMTU_DISCOVERY;
 558
 559         choice = true;
 560         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 561         if(choice)
 562                 myself->options |= OPTION_CLAMP_MSS;
 563
 564         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 565         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 566         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 567                 if(!strcasecmp(bmode, "no"))
 568                         broadcast_mode = BMODE_NONE;
 569                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 570                         broadcast_mode = BMODE_MST;
 571                 else if(!strcasecmp(bmode, "direct"))
 572                         broadcast_mode = BMODE_DIRECT;
 573                 else {
 574                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 575                         return false;
 576                 }
 577                 free(bmode);
 578         }
 579
 580         const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
 581         for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
 582                 subnet_t *s = new_subnet();
 583                 if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))
 584                         abort();
 585                 subnet_add(NULL, s);
 586         }
 587         for (config_t* cfg = lookup_config(config_tree, "BroadcastSubnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 588                 subnet_t *s;
 589                 if (!get_config_subnet(cfg, &s))
 590                         continue;
 591                 subnet_add(NULL, s);
 592         }
 593
 594 #if !defined(SOL_IP) || !defined(IP_TOS)
 595         if(priorityinheritance)
 596                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 597 #endif
 598
 599         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 600                 macexpire = 600;
 601
 602         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 603                 if(maxtimeout <= 0) {
 604                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 605                         return false;
 606                 }
 607         } else
 608                 maxtimeout = 900;
 609
 610         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 611                 if(!strcasecmp(afname, "IPv4"))
 612                         addressfamily = AF_INET;
 613                 else if(!strcasecmp(afname, "IPv6"))
 614                         addressfamily = AF_INET6;
 615                 else if(!strcasecmp(afname, "any"))
 616                         addressfamily = AF_UNSPEC;
 617                 else {
 618                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 619                         return false;
 620                 }
 621                 free(afname);
 622         }
 623
 624         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 625
 626         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 627                 keylifetime = 3600;
 628
 629         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 630         if(cfg) {
 631                 if(!get_config_bool(cfg, &autoconnect)) {
 632                         // Some backwards compatibility with when this option was an int
 633                         int val = 0;
 634                         get_config_int(cfg, &val);
 635                         autoconnect = val;
 636                 }
 637         }
 638
 639         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 640
 641         read_invitation_key();
 642
 643         return true;
 644 }
 645
 646 /*
 647   Add listening sockets.
 648 */
 649 static bool add_listen_address(char *address, bool bindto) {
 650         char *port = myport;
 651
 652         if(address) {
 653                 char *space = strchr(address, ' ');
 654                 if(space) {
 655                         *space++ = 0;
 656                         port = space;
 657                 }
 658
 659                 if(!strcmp(address, "*"))
 660                         *address = 0;
 661         }
 662
 663         struct addrinfo *ai, hint = {0};
 664         hint.ai_family = addressfamily;
 665         hint.ai_socktype = SOCK_STREAM;
 666         hint.ai_protocol = IPPROTO_TCP;
 667         hint.ai_flags = AI_PASSIVE;
 668
 669 #ifdef HAVE_DECL_RES_INIT
 670         res_init();
 671 #endif
 672         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 673         free(address);
 674
 675         if(err || !ai) {
 676                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 677                 return false;
 678         }
 679
 680         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 681                 // Ignore duplicate addresses
 682                 bool found = false;
 683
 684                 for(int i = 0; i < listen_sockets; i++)
 685                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 686                                 found = true;
 687                                 break;
 688                         }
 689
 690                 if(found)
 691                         continue;
 692
 693                 if(listen_sockets >= MAXSOCKETS) {
 694                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 695                         return false;
 696                 }
 697
 698                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 699
 700                 if(tcp_fd < 0)
 701                         continue;
 702
 703                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 704
 705                 if(tcp_fd < 0) {
 706                         close(tcp_fd);
 707                         continue;
 708                 }
 709
 710                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 711                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 712
 713                 if(debug_level >= DEBUG_CONNECTIONS) {
 714                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 715                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 716                         free(hostname);
 717                 }
 718
 719                 listen_socket[listen_sockets].bindto = bindto;
 720                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 721                 listen_sockets++;
 722         }
 723
 724         freeaddrinfo(ai);
 725         return true;
 726 }
 727
 728 void device_enable(void) {
 729         if (devops.enable)
 730                 devops.enable();
 731
 732         /* Run tinc-up script to further initialize the tap interface */
 733
 734         char *envp[5] = {NULL};
 735         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 736         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 737         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 738         xasprintf(&envp[3], "NAME=%s", myname);
 739
 740         execute_script("tinc-up", envp);
 741
 742         for(int i = 0; i < 4; i++)
 743                 free(envp[i]);
 744 }
 745
 746 void device_disable(void) {
 747         char *envp[5] = {NULL};
 748         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 749         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 750         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 751         xasprintf(&envp[3], "NAME=%s", myname);
 752
 753         execute_script("tinc-down", envp);
 754
 755         for(int i = 0; i < 4; i++)
 756                 free(envp[i]);
 757
 758         if (devops.disable)
 759                 devops.disable();
 760 }
 761
 762 /*
 763   Configure node_t myself and set up the local sockets (listen only)
 764 */
 765 static bool setup_myself(void) {
 766         char *name, *hostname, *cipher, *digest, *type;
 767         char *address = NULL;
 768         bool port_specified = false;
 769
 770         if(!(name = get_name())) {
 771                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 772                 return false;
 773         }
 774
 775         myname = xstrdup(name);
 776         myself = new_node();
 777         myself->connection = new_connection();
 778         myself->name = name;
 779         myself->connection->name = xstrdup(name);
 780         read_host_config(config_tree, name);
 781
 782         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 783                 myport = xstrdup("655");
 784         else
 785                 port_specified = true;
 786
 787         myself->connection->options = 0;
 788         myself->connection->protocol_major = PROT_MAJOR;
 789         myself->connection->protocol_minor = PROT_MINOR;
 790
 791         myself->options |= PROT_MINOR << 24;
 792
 793 #ifdef DISABLE_LEGACY
 794         experimental = read_ecdsa_private_key();
 795         if(!experimental) {
 796                 logger(DEBUG_ALWAYS, LOG_ERR, "No private key available, cannot start tinc!");
 797                 return false;
 798         }
 799 #else
 800         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 801                 experimental = read_ecdsa_private_key();
 802                 if(!experimental)
 803                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 804         } else {
 805                 if(experimental && !read_ecdsa_private_key())
 806                         return false;
 807         }
 808
 809         if(!read_rsa_private_key()) {
 810                 if(experimental) {
 811                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for legacy protocol disabled.");
 812                 } else {
 813                         logger(DEBUG_ALWAYS, LOG_ERR, "No private keys available, cannot start tinc!");
 814                         return false;
 815                 }
 816         }
 817 #endif
 818
 819         /* Ensure myport is numeric */
 820
 821         if(!atoi(myport)) {
 822                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 823                 sockaddr_t sa;
 824                 if(!ai || !ai->ai_addr)
 825                         return false;
 826                 free(myport);
 827                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 828                 sockaddr2str(&sa, NULL, &myport);
 829         }
 830
 831         /* Read in all the subnets specified in the host configuration file */
 832
 833         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 834                 subnet_t *subnet;
 835
 836                 if(!get_config_subnet(cfg, &subnet))
 837                         return false;
 838
 839                 subnet_add(myself, subnet);
 840         }
 841
 842         /* Check some options */
 843
 844         if(!setup_myself_reloadable())
 845                 return false;
 846
 847         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 848         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 849         strictsubnets |= tunnelserver;
 850
 851         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 852                 if(max_connection_burst <= 0) {
 853                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 854                         return false;
 855                 }
 856         }
 857
 858         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 859                 if(udp_rcvbuf <= 0) {
 860                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 861                         return false;
 862                 }
 863         }
 864
 865         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 866                 if(udp_sndbuf <= 0) {
 867                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 868                         return false;
 869                 }
 870         }
 871
 872         int replaywin_int;
 873         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 874                 if(replaywin_int < 0) {
 875                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 876                         return false;
 877                 }
 878                 replaywin = (unsigned)replaywin_int;
 879                 sptps_replaywin = replaywin;
 880         }
 881
 882 #ifndef DISABLE_LEGACY
 883         /* Generate packet encryption key */
 884
 885         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 886                 cipher = xstrdup("blowfish");
 887
 888         if(!strcasecmp(cipher, "none")) {
 889                 myself->incipher = NULL;
 890         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 891                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 892                 return false;
 893         }
 894
 895         free(cipher);
 896
 897         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 898
 899         /* Check if we want to use message authentication codes... */
 900
 901         int maclength = 4;
 902         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 903
 904         if(maclength < 0) {
 905                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 906                 return false;
 907         }
 908
 909         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 910                 digest = xstrdup("sha1");
 911
 912         if(!strcasecmp(digest, "none")) {
 913                 myself->indigest = NULL;
 914         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 915                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 916                 return false;
 917         }
 918
 919         free(digest);
 920 #endif
 921
 922         /* Compression */
 923
 924         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 925                 if(myself->incompression < 0 || myself->incompression > 11) {
 926                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 927                         return false;
 928                 }
 929         } else
 930                 myself->incompression = 0;
 931
 932         myself->connection->outcompression = 0;
 933
 934         /* Done */
 935
 936         myself->nexthop = myself;
 937         myself->via = myself;
 938         myself->status.reachable = true;
 939         myself->last_state_change = now.tv_sec;
 940         myself->status.sptps = experimental;
 941         node_add(myself);
 942
 943         graph();
 944
 945         if(strictsubnets)
 946                 load_all_subnets();
 947         else if(autoconnect)
 948                 load_all_nodes();
 949
 950         /* Open device */
 951
 952         devops = os_devops;
 953
 954         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 955                 if(!strcasecmp(type, "dummy"))
 956                         devops = dummy_devops;
 957                 else if(!strcasecmp(type, "raw_socket"))
 958                         devops = raw_socket_devops;
 959                 else if(!strcasecmp(type, "multicast"))
 960                         devops = multicast_devops;
 961 #ifdef ENABLE_UML
 962                 else if(!strcasecmp(type, "uml"))
 963                         devops = uml_devops;
 964 #endif
 965 #ifdef ENABLE_VDE
 966                 else if(!strcasecmp(type, "vde"))
 967                         devops = vde_devops;
 968 #endif
 969         }
 970
 971         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 972
 973         if(!devops.setup())
 974                 return false;
 975
 976         if(device_fd >= 0)
 977                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 978
 979         /* Open sockets */
 980
 981         if(!do_detach && getenv("LISTEN_FDS")) {
 982                 sockaddr_t sa;
 983                 socklen_t salen;
 984
 985                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 986 #ifdef HAVE_UNSETENV
 987                 unsetenv("LISTEN_FDS");
 988 #endif
 989
 990                 if(listen_sockets > MAXSOCKETS) {
 991                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 992                         return false;
 993                 }
 994
 995                 for(int i = 0; i < listen_sockets; i++) {
 996                         salen = sizeof sa;
 997                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 998                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 999                                 return false;
1000                         }
1001
1002 #ifdef FD_CLOEXEC
1003                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
1004 #endif
1005
1006                         int udp_fd = setup_vpn_in_socket(&sa);
1007                         if(udp_fd < 0)
1008                                 return false;
1009
1010                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
1011                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
1012
1013                         if(debug_level >= DEBUG_CONNECTIONS) {
1014                                 hostname = sockaddr2hostname(&sa);
1015                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1016                                 free(hostname);
1017                         }
1018
1019                         memcpy(&listen_socket[i].sa, &sa, salen);
1020                 }
1021         } else {
1022                 listen_sockets = 0;
1023                 int cfgs = 0;
1024
1025                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1026                         cfgs++;
1027                         get_config_string(cfg, &address);
1028                         if(!add_listen_address(address, true))
1029                                 return false;
1030                 }
1031
1032                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1033                         cfgs++;
1034                         get_config_string(cfg, &address);
1035                         if(!add_listen_address(address, false))
1036                                 return false;
1037                 }
1038
1039                 if(!cfgs)
1040                         if(!add_listen_address(address, NULL))
1041                                 return false;
1042         }
1043
1044         if(!listen_sockets) {
1045                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1046                 return false;
1047         }
1048
1049         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1050
1051         if(!port_specified || atoi(myport) == 0) {
1052                 sockaddr_t sa;
1053                 socklen_t salen = sizeof sa;
1054                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1055                         free(myport);
1056                         sockaddr2str(&sa, NULL, &myport);
1057                         if(!myport)
1058                                 myport = xstrdup("655");
1059                 }
1060         }
1061
1062         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1063         myself->connection->hostname = xstrdup(myself->hostname);
1064
1065         /* Done. */
1066
1067         last_config_check = now.tv_sec;
1068
1069         return true;
1070 }
1071
1072 /*
1073   initialize network
1074 */
1075 bool setup_network(void) {
1076         init_connections();
1077         init_subnets();
1078         init_nodes();
1079         init_edges();
1080         init_requests();
1081
1082         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1083                 if(pinginterval < 1) {
1084                         pinginterval = 86400;
1085                 }
1086         } else
1087                 pinginterval = 60;
1088
1089         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1090                 pingtimeout = 5;
1091         if(pingtimeout < 1 || pingtimeout > pinginterval)
1092                 pingtimeout = pinginterval;
1093
1094         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1095                 maxoutbufsize = 10 * MTU;
1096
1097         if(!setup_myself())
1098                 return false;
1099
1100         if(!init_control())
1101                 return false;
1102
1103         if (!device_standby)
1104                 device_enable();
1105
1106         /* Run subnet-up scripts for our own subnets */
1107
1108         subnet_update(myself, NULL, true);
1109
1110         return true;
1111 }
1112
1113 /*
1114   close all open network connections
1115 */
1116 void close_network_connections(void) {
1117         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1118                 next = node->next;
1119                 connection_t *c = node->data;
1120                 /* Keep control connections open until the end, so they know when we really terminated */
1121                 if(c->status.control)
1122                         c->socket = -1;
1123                 c->outgoing = NULL;
1124                 terminate_connection(c, false);
1125         }
1126
1127         if(outgoing_list)
1128                 list_delete_list(outgoing_list);
1129
1130         if(myself && myself->connection) {
1131                 subnet_update(myself, NULL, false);
1132                 terminate_connection(myself->connection, false);
1133                 free_connection(myself->connection);
1134         }
1135
1136         for(int i = 0; i < listen_sockets; i++) {
1137                 io_del(&listen_socket[i].tcp);
1138                 io_del(&listen_socket[i].udp);
1139                 close(listen_socket[i].tcp.fd);
1140                 close(listen_socket[i].udp.fd);
1141         }
1142
1143         exit_requests();
1144         exit_edges();
1145         exit_subnets();
1146         exit_nodes();
1147         exit_connections();
1148
1149         if (!device_standby)
1150                 device_disable();
1151
1152         free(myport);
1153
1154         if (device_fd >= 0)
1155                 io_del(&device_io);
1156         if (devops.close)
1157                 devops.close();
1158
1159         exit_control();
1160
1161         free(myname);
1162         free(scriptextension);
1163         free(scriptinterpreter);
1164
1165         return;
1166 }