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 io_t device_io;
  48 devops_t devops;
  49 bool device_standby = false;
  50
  51 char *proxyhost;
  52 char *proxyport;
  53 char *proxyuser;
  54 char *proxypass;
  55 proxytype_t proxytype;
  56 bool autoconnect;
  57 bool disablebuggypeers;
  58
  59 char *scriptinterpreter;
  60 char *scriptextension;
  61
  62 bool node_read_ecdsa_public_key(node_t *n) {
  63         if(ecdsa_active(n->ecdsa))
  64                 return true;
  65
  66         splay_tree_t *config_tree;
  67         FILE *fp;
  68         char *pubname = NULL;
  69         char *p;
  70
  71         init_configuration(&config_tree);
  72         if(!read_host_config(config_tree, n->name))
  73                 goto exit;
  74
  75         /* First, check for simple Ed25519PublicKey statement */
  76
  77         if(get_config_string(lookup_config(config_tree, "Ed25519PublicKey"), &p)) {
  78                 n->ecdsa = ecdsa_set_base64_public_key(p);
  79                 free(p);
  80                 goto exit;
  81         }
  82
  83         /* Else, check for Ed25519PublicKeyFile statement and read it */
  84
  85         if(!get_config_string(lookup_config(config_tree, "Ed25519PublicKeyFile"), &pubname))
  86                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  87
  88         fp = fopen(pubname, "r");
  89
  90         if(!fp)
  91                 goto exit;
  92
  93         n->ecdsa = ecdsa_read_pem_public_key(fp);
  94         fclose(fp);
  95
  96 exit:
  97         exit_configuration(&config_tree);
  98         free(pubname);
  99         return n->ecdsa;
 100 }
 101
 102 bool read_ecdsa_public_key(connection_t *c) {
 103         if(ecdsa_active(c->ecdsa))
 104                 return true;
 105
 106         FILE *fp;
 107         char *fname;
 108         char *p;
 109
 110         if(!c->config_tree) {
 111                 init_configuration(&c->config_tree);
 112                 if(!read_host_config(c->config_tree, c->name))
 113                         return false;
 114         }
 115
 116         /* First, check for simple Ed25519PublicKey statement */
 117
 118         if(get_config_string(lookup_config(c->config_tree, "Ed25519PublicKey"), &p)) {
 119                 c->ecdsa = ecdsa_set_base64_public_key(p);
 120                 free(p);
 121                 return c->ecdsa;
 122         }
 123
 124         /* Else, check for Ed25519PublicKeyFile statement and read it */
 125
 126         if(!get_config_string(lookup_config(c->config_tree, "Ed25519PublicKeyFile"), &fname))
 127                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 128
 129         fp = fopen(fname, "r");
 130
 131         if(!fp) {
 132                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 public key file `%s': %s",
 133                            fname, strerror(errno));
 134                 free(fname);
 135                 return false;
 136         }
 137
 138         c->ecdsa = ecdsa_read_pem_public_key(fp);
 139         fclose(fp);
 140
 141         if(!c->ecdsa)
 142                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing Ed25519 public key file `%s' failed.", fname);
 143         free(fname);
 144         return c->ecdsa;
 145 }
 146
 147 bool read_rsa_public_key(connection_t *c) {
 148         if(ecdsa_active(c->ecdsa))
 149                 return true;
 150
 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
 185 static bool read_ecdsa_private_key(void) {
 186         FILE *fp;
 187         char *fname;
 188
 189         /* Check for PrivateKeyFile statement and read it */
 190
 191         if(!get_config_string(lookup_config(config_tree, "Ed25519PrivateKeyFile"), &fname))
 192                 xasprintf(&fname, "%s" SLASH "ed25519_key.priv", confbase);
 193
 194         fp = fopen(fname, "r");
 195
 196         if(!fp) {
 197                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading Ed25519 private key file `%s': %s", fname, strerror(errno));
 198                 if(errno == ENOENT)
 199                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an Ed25519 keypair with `tinc -n %s generate-ed25519-keys'.", netname ?: ".");
 200                 free(fname);
 201                 return false;
 202         }
 203
 204 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 205         struct stat s;
 206
 207         if(fstat(fileno(fp), &s)) {
 208                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat Ed25519 private key file `%s': %s'", fname, strerror(errno));
 209                 free(fname);
 210                 return false;
 211         }
 212
 213         if(s.st_mode & ~0100700)
 214                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for Ed25519 private key file `%s'!", fname);
 215 #endif
 216
 217         myself->connection->ecdsa = ecdsa_read_pem_private_key(fp);
 218         fclose(fp);
 219
 220         if(!myself->connection->ecdsa)
 221                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 222         free(fname);
 223         return myself->connection->ecdsa;
 224 }
 225
 226 static bool read_invitation_key(void) {
 227         FILE *fp;
 228         char *fname;
 229
 230         if(invitation_key) {
 231                 ecdsa_free(invitation_key);
 232                 invitation_key = NULL;
 233         }
 234
 235         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
 236
 237         fp = fopen(fname, "r");
 238
 239         if(fp) {
 240                 invitation_key = ecdsa_read_pem_private_key(fp);
 241                 fclose(fp);
 242                 if(!invitation_key)
 243                         logger(DEBUG_ALWAYS, LOG_ERR, "Reading Ed25519 private key file `%s' failed", fname);
 244         }
 245
 246         free(fname);
 247         return invitation_key;
 248 }
 249
 250 static bool read_rsa_private_key(void) {
 251         FILE *fp;
 252         char *fname;
 253         char *n, *d;
 254
 255         /* First, check for simple PrivateKey statement */
 256
 257         if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
 258                 if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
 259                         logger(DEBUG_ALWAYS, LOG_ERR, "PrivateKey used but no PublicKey found!");
 260                         free(d);
 261                         return false;
 262                 }
 263                 myself->connection->rsa = rsa_set_hex_private_key(n, "FFFF", d);
 264                 free(n);
 265                 free(d);
 266                 return myself->connection->rsa;
 267         }
 268
 269         /* Else, check for PrivateKeyFile statement and read it */
 270
 271         if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
 272                 xasprintf(&fname, "%s" SLASH "rsa_key.priv", confbase);
 273
 274         fp = fopen(fname, "r");
 275
 276         if(!fp) {
 277                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA private key file `%s': %s",
 278                            fname, strerror(errno));
 279                 free(fname);
 280                 return false;
 281         }
 282
 283 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 284         struct stat s;
 285
 286         if(fstat(fileno(fp), &s)) {
 287                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 288                 free(fname);
 289                 return false;
 290         }
 291
 292         if(s.st_mode & ~0100700)
 293                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 294 #endif
 295
 296         myself->connection->rsa = rsa_read_pem_private_key(fp);
 297         fclose(fp);
 298
 299         if(!myself->connection->rsa)
 300                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 301         free(fname);
 302         return myself->connection->rsa;
 303 }
 304
 305 static timeout_t keyexpire_timeout;
 306
 307 static void keyexpire_handler(void *data) {
 308         regenerate_key();
 309         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 310 }
 311
 312 void regenerate_key(void) {
 313         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 314         send_key_changed();
 315 }
 316
 317 /*
 318   Read Subnets from all host config files
 319 */
 320 void load_all_subnets(void) {
 321         DIR *dir;
 322         struct dirent *ent;
 323         char *dname;
 324
 325         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 326         dir = opendir(dname);
 327         if(!dir) {
 328                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 329                 free(dname);
 330                 return;
 331         }
 332
 333         while((ent = readdir(dir))) {
 334                 if(!check_id(ent->d_name))
 335                         continue;
 336
 337                 node_t *n = lookup_node(ent->d_name);
 338                 #ifdef _DIRENT_HAVE_D_TYPE
 339                 //if(ent->d_type != DT_REG)
 340                 //      continue;
 341                 #endif
 342
 343                 splay_tree_t *config_tree;
 344                 init_configuration(&config_tree);
 345                 read_config_options(config_tree, ent->d_name);
 346                 read_host_config(config_tree, ent->d_name);
 347
 348                 if(!n) {
 349                         n = new_node();
 350                         n->name = xstrdup(ent->d_name);
 351                         node_add(n);
 352                 }
 353
 354                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 355                         subnet_t *s, *s2;
 356
 357                         if(!get_config_subnet(cfg, &s))
 358                                 continue;
 359
 360                         if((s2 = lookup_subnet(n, s))) {
 361                                 s2->expires = -1;
 362                         } else {
 363                                 subnet_add(n, s);
 364                         }
 365                 }
 366
 367                 exit_configuration(&config_tree);
 368         }
 369
 370         closedir(dir);
 371 }
 372
 373 void load_all_nodes(void) {
 374         DIR *dir;
 375         struct dirent *ent;
 376         char *dname;
 377
 378         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 379         dir = opendir(dname);
 380         if(!dir) {
 381                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 382                 free(dname);
 383                 return;
 384         }
 385
 386         while((ent = readdir(dir))) {
 387                 if(!check_id(ent->d_name))
 388                         continue;
 389
 390                 node_t *n = lookup_node(ent->d_name);
 391                 if(n)
 392                         continue;
 393
 394                 n = new_node();
 395                 n->name = xstrdup(ent->d_name);
 396                 node_add(n);
 397         }
 398
 399         closedir(dir);
 400 }
 401
 402
 403 char *get_name(void) {
 404         char *name = NULL;
 405
 406         get_config_string(lookup_config(config_tree, "Name"), &name);
 407
 408         if(!name)
 409                 return NULL;
 410
 411         if(*name == '$') {
 412                 char *envname = getenv(name + 1);
 413                 char hostname[32] = "";
 414                 if(!envname) {
 415                         if(strcmp(name + 1, "HOST")) {
 416                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 417                                 return false;
 418                         }
 419                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
 420                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", sockstrerror(sockerrno));
 421                                 return false;
 422                         }
 423                         hostname[31] = 0;
 424                         envname = hostname;
 425                 }
 426                 free(name);
 427                 name = xstrdup(envname);
 428                 for(char *c = name; *c; c++)
 429                         if(!isalnum(*c))
 430                                 *c = '_';
 431         }
 432
 433         if(!check_id(name)) {
 434                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 435                 free(name);
 436                 return false;
 437         }
 438
 439         return name;
 440 }
 441
 442 bool setup_myself_reloadable(void) {
 443         char *proxy = NULL;
 444         char *rmode = NULL;
 445         char *fmode = NULL;
 446         char *bmode = NULL;
 447         char *afname = NULL;
 448         char *address = NULL;
 449         char *space;
 450         bool choice;
 451
 452         free(scriptinterpreter);
 453         scriptinterpreter = NULL;
 454         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 455
 456
 457         free(scriptextension);
 458         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 459                 scriptextension = xstrdup("");
 460
 461         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 462         if(proxy) {
 463                 if((space = strchr(proxy, ' ')))
 464                         *space++ = 0;
 465
 466                 if(!strcasecmp(proxy, "none")) {
 467                         proxytype = PROXY_NONE;
 468                 } else if(!strcasecmp(proxy, "socks4")) {
 469                         proxytype = PROXY_SOCKS4;
 470                 } else if(!strcasecmp(proxy, "socks4a")) {
 471                         proxytype = PROXY_SOCKS4A;
 472                 } else if(!strcasecmp(proxy, "socks5")) {
 473                         proxytype = PROXY_SOCKS5;
 474                 } else if(!strcasecmp(proxy, "http")) {
 475                         proxytype = PROXY_HTTP;
 476                 } else if(!strcasecmp(proxy, "exec")) {
 477                         proxytype = PROXY_EXEC;
 478                 } else {
 479                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 480                         return false;
 481                 }
 482
 483                 switch(proxytype) {
 484                         case PROXY_NONE:
 485                         default:
 486                                 break;
 487
 488                         case PROXY_EXEC:
 489                                 if(!space || !*space) {
 490                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 491                                         return false;
 492                                 }
 493                                 proxyhost =  xstrdup(space);
 494                                 break;
 495
 496                         case PROXY_SOCKS4:
 497                         case PROXY_SOCKS4A:
 498                         case PROXY_SOCKS5:
 499                         case PROXY_HTTP:
 500                                 proxyhost = space;
 501                                 if(space && (space = strchr(space, ' ')))
 502                                         *space++ = 0, proxyport = space;
 503                                 if(space && (space = strchr(space, ' ')))
 504                                         *space++ = 0, proxyuser = space;
 505                                 if(space && (space = strchr(space, ' ')))
 506                                         *space++ = 0, proxypass = space;
 507                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 508                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 509                                         return false;
 510                                 }
 511                                 proxyhost = xstrdup(proxyhost);
 512                                 proxyport = xstrdup(proxyport);
 513                                 if(proxyuser && *proxyuser)
 514                                         proxyuser = xstrdup(proxyuser);
 515                                 if(proxypass && *proxypass)
 516                                         proxypass = xstrdup(proxypass);
 517                                 break;
 518                 }
 519
 520                 free(proxy);
 521         }
 522
 523         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 524                 myself->options |= OPTION_INDIRECT;
 525
 526         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 527                 myself->options |= OPTION_TCPONLY;
 528
 529         if(myself->options & OPTION_TCPONLY)
 530                 myself->options |= OPTION_INDIRECT;
 531
 532         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 533         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 534
 535         memset(&localdiscovery_address, 0, sizeof localdiscovery_address);
 536         if(get_config_string(lookup_config(config_tree, "LocalDiscoveryAddress"), &address)) {
 537                 struct addrinfo *ai = str2addrinfo(address, myport, SOCK_DGRAM);
 538                 free(address);
 539                 if(!ai)
 540                         return false;
 541                 memcpy(&localdiscovery_address, ai->ai_addr, ai->ai_addrlen);
 542         }
 543
 544
 545         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 546                 if(!strcasecmp(rmode, "router"))
 547                         routing_mode = RMODE_ROUTER;
 548                 else if(!strcasecmp(rmode, "switch"))
 549                         routing_mode = RMODE_SWITCH;
 550                 else if(!strcasecmp(rmode, "hub"))
 551                         routing_mode = RMODE_HUB;
 552                 else {
 553                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 554                         return false;
 555                 }
 556                 free(rmode);
 557         }
 558
 559         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 560                 if(!strcasecmp(fmode, "off"))
 561                         forwarding_mode = FMODE_OFF;
 562                 else if(!strcasecmp(fmode, "internal"))
 563                         forwarding_mode = FMODE_INTERNAL;
 564                 else if(!strcasecmp(fmode, "kernel"))
 565                         forwarding_mode = FMODE_KERNEL;
 566                 else {
 567                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 568                         return false;
 569                 }
 570                 free(fmode);
 571         }
 572
 573         choice = true;
 574         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 575         if(choice)
 576                 myself->options |= OPTION_PMTU_DISCOVERY;
 577
 578         choice = true;
 579         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 580         if(choice)
 581                 myself->options |= OPTION_CLAMP_MSS;
 582
 583         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 584         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 585         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 586                 if(!strcasecmp(bmode, "no"))
 587                         broadcast_mode = BMODE_NONE;
 588                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 589                         broadcast_mode = BMODE_MST;
 590                 else if(!strcasecmp(bmode, "direct"))
 591                         broadcast_mode = BMODE_DIRECT;
 592                 else {
 593                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 594                         return false;
 595                 }
 596                 free(bmode);
 597         }
 598
 599 #if !defined(SOL_IP) || !defined(IP_TOS)
 600         if(priorityinheritance)
 601                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 602 #endif
 603
 604         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 605                 macexpire = 600;
 606
 607         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 608                 if(maxtimeout <= 0) {
 609                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 610                         return false;
 611                 }
 612         } else
 613                 maxtimeout = 900;
 614
 615         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 616                 if(!strcasecmp(afname, "IPv4"))
 617                         addressfamily = AF_INET;
 618                 else if(!strcasecmp(afname, "IPv6"))
 619                         addressfamily = AF_INET6;
 620                 else if(!strcasecmp(afname, "any"))
 621                         addressfamily = AF_UNSPEC;
 622                 else {
 623                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 624                         return false;
 625                 }
 626                 free(afname);
 627         }
 628
 629         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 630
 631         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 632                 keylifetime = 3600;
 633
 634         config_t *cfg = lookup_config(config_tree, "AutoConnect");
 635         if(cfg) {
 636                 if(!get_config_bool(cfg, &autoconnect)) {
 637                         // Some backwards compatibility with when this option was an int
 638                         int val = 0;
 639                         get_config_int(cfg, &val);
 640                         autoconnect = val;
 641                 }
 642         }
 643
 644         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 645
 646         read_invitation_key();
 647
 648         return true;
 649 }
 650
 651 /*
 652   Add listening sockets.
 653 */
 654 static bool add_listen_address(char *address, bool bindto) {
 655         char *port = myport;
 656
 657         if(address) {
 658                 char *space = strchr(address, ' ');
 659                 if(space) {
 660                         *space++ = 0;
 661                         port = space;
 662                 }
 663
 664                 if(!strcmp(address, "*"))
 665                         *address = 0;
 666         }
 667
 668         struct addrinfo *ai, hint = {0};
 669         hint.ai_family = addressfamily;
 670         hint.ai_socktype = SOCK_STREAM;
 671         hint.ai_protocol = IPPROTO_TCP;
 672         hint.ai_flags = AI_PASSIVE;
 673
 674         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 675         free(address);
 676
 677         if(err || !ai) {
 678                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 679                 return false;
 680         }
 681
 682         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 683                 // Ignore duplicate addresses
 684                 bool found = false;
 685
 686                 for(int i = 0; i < listen_sockets; i++)
 687                         if(!memcmp(&listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
 688                                 found = true;
 689                                 break;
 690                         }
 691
 692                 if(found)
 693                         continue;
 694
 695                 if(listen_sockets >= MAXSOCKETS) {
 696                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 697                         return false;
 698                 }
 699
 700                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 701
 702                 if(tcp_fd < 0)
 703                         continue;
 704
 705                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 706
 707                 if(tcp_fd < 0) {
 708                         close(tcp_fd);
 709                         continue;
 710                 }
 711
 712                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 713                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 714
 715                 if(debug_level >= DEBUG_CONNECTIONS) {
 716                         char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 717                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 718                         free(hostname);
 719                 }
 720
 721                 listen_socket[listen_sockets].bindto = bindto;
 722                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 723                 listen_sockets++;
 724         }
 725
 726         freeaddrinfo(ai);
 727         return true;
 728 }
 729
 730 void device_enable(void) {
 731         if (devops.enable)
 732                 devops.enable();
 733
 734         /* Run tinc-up script to further initialize the tap interface */
 735
 736         char *envp[5] = {NULL};
 737         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 738         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 739         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 740         xasprintf(&envp[3], "NAME=%s", myself->name);
 741
 742         execute_script("tinc-up", envp);
 743
 744         for(int i = 0; i < 4; i++)
 745                 free(envp[i]);
 746 }
 747
 748 void device_disable(void) {
 749         char *envp[5] = {NULL};
 750         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 751         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 752         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 753         xasprintf(&envp[3], "NAME=%s", myself->name);
 754
 755         execute_script("tinc-down", envp);
 756
 757         for(int i = 0; i < 4; i++)
 758                 free(envp[i]);
 759
 760         if (devops.disable)
 761                 devops.disable();
 762 }
 763
 764 /*
 765   Configure node_t myself and set up the local sockets (listen only)
 766 */
 767 static bool setup_myself(void) {
 768         char *name, *hostname, *cipher, *digest, *type;
 769         char *address = NULL;
 770         bool port_specified = false;
 771
 772         if(!(name = get_name())) {
 773                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 774                 return false;
 775         }
 776
 777         myself = new_node();
 778         myself->connection = new_connection();
 779         myself->name = name;
 780         myself->connection->name = xstrdup(name);
 781         read_host_config(config_tree, name);
 782
 783         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 784                 myport = xstrdup("655");
 785         else
 786                 port_specified = true;
 787
 788         myself->connection->options = 0;
 789         myself->connection->protocol_major = PROT_MAJOR;
 790         myself->connection->protocol_minor = PROT_MINOR;
 791
 792         myself->options |= PROT_MINOR << 24;
 793
 794         if(!get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental)) {
 795                 experimental = read_ecdsa_private_key();
 796                 if(!experimental)
 797                         logger(DEBUG_ALWAYS, LOG_WARNING, "Support for SPTPS disabled.");
 798         } else {
 799                 if(experimental && !read_ecdsa_private_key())
 800                         return false;
 801         }
 802
 803         if(!read_rsa_private_key())
 804                 return false;
 805
 806         /* Ensure myport is numeric */
 807
 808         if(!atoi(myport)) {
 809                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 810                 sockaddr_t sa;
 811                 if(!ai || !ai->ai_addr)
 812                         return false;
 813                 free(myport);
 814                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 815                 sockaddr2str(&sa, NULL, &myport);
 816         }
 817
 818         /* Read in all the subnets specified in the host configuration file */
 819
 820         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 821                 subnet_t *subnet;
 822
 823                 if(!get_config_subnet(cfg, &subnet))
 824                         return false;
 825
 826                 subnet_add(myself, subnet);
 827         }
 828
 829         /* Check some options */
 830
 831         if(!setup_myself_reloadable())
 832                 return false;
 833
 834         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 835         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 836         strictsubnets |= tunnelserver;
 837
 838         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 839                 if(max_connection_burst <= 0) {
 840                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 841                         return false;
 842                 }
 843         }
 844
 845         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 846                 if(udp_rcvbuf <= 0) {
 847                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 848                         return false;
 849                 }
 850         }
 851
 852         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 853                 if(udp_sndbuf <= 0) {
 854                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 855                         return false;
 856                 }
 857         }
 858
 859         int replaywin_int;
 860         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 861                 if(replaywin_int < 0) {
 862                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 863                         return false;
 864                 }
 865                 replaywin = (unsigned)replaywin_int;
 866                 sptps_replaywin = replaywin;
 867         }
 868
 869         /* Generate packet encryption key */
 870
 871         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 872                 cipher = xstrdup("blowfish");
 873
 874         if(!strcasecmp(cipher, "none")) {
 875                 myself->incipher = NULL;
 876         } else if(!(myself->incipher = cipher_open_by_name(cipher))) {
 877                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 878                 return false;
 879         }
 880
 881         free(cipher);
 882
 883         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 884
 885         /* Check if we want to use message authentication codes... */
 886
 887         int maclength = 4;
 888         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 889
 890         if(maclength < 0) {
 891                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 892                 return false;
 893         }
 894
 895         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 896                 digest = xstrdup("sha1");
 897
 898         if(!strcasecmp(digest, "none")) {
 899                 myself->indigest = NULL;
 900         } else if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 901                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 902                 return false;
 903         }
 904
 905         free(digest);
 906
 907         /* Compression */
 908
 909         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 910                 if(myself->incompression < 0 || myself->incompression > 11) {
 911                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 912                         return false;
 913                 }
 914         } else
 915                 myself->incompression = 0;
 916
 917         myself->connection->outcompression = 0;
 918
 919         /* Done */
 920
 921         myself->nexthop = myself;
 922         myself->via = myself;
 923         myself->status.reachable = true;
 924         myself->last_state_change = now.tv_sec;
 925         myself->status.sptps = experimental;
 926         node_add(myself);
 927
 928         graph();
 929
 930         if(strictsubnets)
 931                 load_all_subnets();
 932         else if(autoconnect)
 933                 load_all_nodes();
 934
 935         /* Open device */
 936
 937         devops = os_devops;
 938
 939         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 940                 if(!strcasecmp(type, "dummy"))
 941                         devops = dummy_devops;
 942                 else if(!strcasecmp(type, "raw_socket"))
 943                         devops = raw_socket_devops;
 944                 else if(!strcasecmp(type, "multicast"))
 945                         devops = multicast_devops;
 946 #ifdef ENABLE_UML
 947                 else if(!strcasecmp(type, "uml"))
 948                         devops = uml_devops;
 949 #endif
 950 #ifdef ENABLE_VDE
 951                 else if(!strcasecmp(type, "vde"))
 952                         devops = vde_devops;
 953 #endif
 954         }
 955
 956         get_config_bool(lookup_config(config_tree, "DeviceStandby"), &device_standby);
 957
 958         if(!devops.setup())
 959                 return false;
 960
 961         if(device_fd >= 0)
 962                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 963
 964         /* Open sockets */
 965
 966         if(!do_detach && getenv("LISTEN_FDS")) {
 967                 sockaddr_t sa;
 968                 socklen_t salen;
 969
 970                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 971 #ifdef HAVE_UNSETENV
 972                 unsetenv("LISTEN_FDS");
 973 #endif
 974
 975                 if(listen_sockets > MAXSOCKETS) {
 976                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 977                         return false;
 978                 }
 979
 980                 for(int i = 0; i < listen_sockets; i++) {
 981                         salen = sizeof sa;
 982                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 983                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(sockerrno));
 984                                 return false;
 985                         }
 986
 987 #ifdef FD_CLOEXEC
 988                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 989 #endif
 990
 991                         int udp_fd = setup_vpn_in_socket(&sa);
 992                         if(udp_fd < 0)
 993                                 return false;
 994
 995                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 996                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 997
 998                         if(debug_level >= DEBUG_CONNECTIONS) {
 999                                 hostname = sockaddr2hostname(&sa);
1000                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
1001                                 free(hostname);
1002                         }
1003
1004                         memcpy(&listen_socket[i].sa, &sa, salen);
1005                 }
1006         } else {
1007                 listen_sockets = 0;
1008                 int cfgs = 0;
1009
1010                 for(config_t *cfg = lookup_config(config_tree, "BindToAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1011                         cfgs++;
1012                         get_config_string(cfg, &address);
1013                         if(!add_listen_address(address, true))
1014                                 return false;
1015                 }
1016
1017                 for(config_t *cfg = lookup_config(config_tree, "ListenAddress"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
1018                         cfgs++;
1019                         get_config_string(cfg, &address);
1020                         if(!add_listen_address(address, false))
1021                                 return false;
1022                 }
1023
1024                 if(!cfgs)
1025                         if(!add_listen_address(address, NULL))
1026                                 return false;
1027         }
1028
1029         if(!listen_sockets) {
1030                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
1031                 return false;
1032         }
1033
1034         /* If no Port option was specified, set myport to the port used by the first listening socket. */
1035
1036         if(!port_specified) {
1037                 sockaddr_t sa;
1038                 socklen_t salen = sizeof sa;
1039                 if(!getsockname(listen_socket[0].udp.fd, &sa.sa, &salen)) {
1040                         free(myport);
1041                         sockaddr2str(&sa, NULL, &myport);
1042                         if(!myport)
1043                                 myport = xstrdup("655");
1044                 }
1045         }
1046
1047         xasprintf(&myself->hostname, "MYSELF port %s", myport);
1048         myself->connection->hostname = xstrdup(myself->hostname);
1049
1050         /* Done. */
1051
1052         last_config_check = now.tv_sec;
1053
1054         return true;
1055 }
1056
1057 /*
1058   initialize network
1059 */
1060 bool setup_network(void) {
1061         init_connections();
1062         init_subnets();
1063         init_nodes();
1064         init_edges();
1065         init_requests();
1066
1067         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
1068                 if(pinginterval < 1) {
1069                         pinginterval = 86400;
1070                 }
1071         } else
1072                 pinginterval = 60;
1073
1074         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
1075                 pingtimeout = 5;
1076         if(pingtimeout < 1 || pingtimeout > pinginterval)
1077                 pingtimeout = pinginterval;
1078
1079         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
1080                 maxoutbufsize = 10 * MTU;
1081
1082         if(!setup_myself())
1083                 return false;
1084
1085         if(!init_control())
1086                 return false;
1087
1088         if (!device_standby)
1089                 device_enable();
1090
1091         /* Run subnet-up scripts for our own subnets */
1092
1093         subnet_update(myself, NULL, true);
1094
1095         return true;
1096 }
1097
1098 /*
1099   close all open network connections
1100 */
1101 void close_network_connections(void) {
1102         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1103                 next = node->next;
1104                 connection_t *c = node->data;
1105                 /* Keep control connections open until the end, so they know when we really terminated */
1106                 if(c->status.control)
1107                         c->socket = -1;
1108                 c->outgoing = NULL;
1109                 terminate_connection(c, false);
1110         }
1111
1112         if(outgoing_list)
1113                 list_delete_list(outgoing_list);
1114
1115         if(myself && myself->connection) {
1116                 subnet_update(myself, NULL, false);
1117                 terminate_connection(myself->connection, false);
1118                 free_connection(myself->connection);
1119         }
1120
1121         for(int i = 0; i < listen_sockets; i++) {
1122                 io_del(&listen_socket[i].tcp);
1123                 io_del(&listen_socket[i].udp);
1124                 close(listen_socket[i].tcp.fd);
1125                 close(listen_socket[i].udp.fd);
1126         }
1127
1128         exit_requests();
1129         exit_edges();
1130         exit_subnets();
1131         exit_nodes();
1132         exit_connections();
1133
1134         if (!device_standby)
1135                 device_disable();
1136
1137         if(myport) free(myport);
1138
1139         if (device_fd >= 0)
1140                 io_del(&device_io);
1141         devops.close();
1142
1143         exit_control();
1144
1145         return;
1146 }