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

   1 /*
   2     net_setup.c -- Setup.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2013 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
  50 char *proxyhost;
  51 char *proxyport;
  52 char *proxyuser;
  53 char *proxypass;
  54 proxytype_t proxytype;
  55 int autoconnect;
  56 bool disablebuggypeers;
  57
  58 char *scriptinterpreter;
  59 char *scriptextension;
  60
  61 bool node_read_ecdsa_public_key(node_t *n) {
  62         if(ecdsa_active(n->ecdsa))
  63                 return true;
  64
  65         splay_tree_t *config_tree;
  66         FILE *fp;
  67         char *pubname = NULL;
  68         char *p;
  69
  70         init_configuration(&config_tree);
  71         if(!read_host_config(config_tree, n->name))
  72                 goto exit;
  73
  74         /* First, check for simple ECDSAPublicKey statement */
  75
  76         if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
  77                 n->ecdsa = ecdsa_set_base64_public_key(p);
  78                 free(p);
  79                 goto exit;
  80         }
  81
  82         /* Else, check for ECDSAPublicKeyFile statement and read it */
  83
  84         if(!get_config_string(lookup_config(config_tree, "ECDSAPublicKeyFile"), &pubname))
  85                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, n->name);
  86
  87         fp = fopen(pubname, "r");
  88
  89         if(!fp) {
  90                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA public key file `%s': %s", pubname, strerror(errno));
  91                 goto exit;
  92         }
  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 ECDSAPublicKey statement */
 118
 119         if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
 120                 c->ecdsa = ecdsa_set_base64_public_key(p);
 121                 free(p);
 122                 return c->ecdsa;
 123         }
 124
 125         /* Else, check for ECDSAPublicKeyFile statement and read it */
 126
 127         if(!get_config_string(lookup_config(c->config_tree, "ECDSAPublicKeyFile"), &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 ECDSA 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         fclose(fp);
 141
 142         if(!c->ecdsa)
 143                 logger(DEBUG_ALWAYS, LOG_ERR, "Parsing ECDSA public key file `%s' failed.", fname);
 144         free(fname);
 145         return c->ecdsa;
 146 }
 147
 148 bool read_rsa_public_key(connection_t *c) {
 149         if(ecdsa_active(c->ecdsa))
 150                 return true;
 151
 152         FILE *fp;
 153         char *fname;
 154         char *n;
 155
 156         /* First, check for simple PublicKey statement */
 157
 158         if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
 159                 c->rsa = rsa_set_hex_public_key(n, "FFFF");
 160                 free(n);
 161                 return c->rsa;
 162         }
 163
 164         /* Else, check for PublicKeyFile statement and read it */
 165
 166         if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
 167                 xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
 168
 169         fp = fopen(fname, "r");
 170
 171         if(!fp) {
 172                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading RSA public key file `%s': %s", fname, strerror(errno));
 173                 free(fname);
 174                 return false;
 175         }
 176
 177         c->rsa = rsa_read_pem_public_key(fp);
 178         fclose(fp);
 179
 180         if(!c->rsa)
 181                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
 182         free(fname);
 183         return c->rsa;
 184 }
 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, "ECDSAPrivateKeyFile"), &fname))
 193                 xasprintf(&fname, "%s" SLASH "ecdsa_key.priv", confbase);
 194
 195         fp = fopen(fname, "r");
 196
 197         if(!fp) {
 198                 logger(DEBUG_ALWAYS, LOG_ERR, "Error reading ECDSA private key file `%s': %s", fname, strerror(errno));
 199                 if(errno == ENOENT)
 200                         logger(DEBUG_ALWAYS, LOG_INFO, "Create an ECDSA keypair with `tinc -n %s generate-ecdsa-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 ECDSA 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 ECDSA 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 ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 223         free(fname);
 224         return myself->connection->ecdsa;
 225 }
 226
 227 static bool read_invitation_key(void) {
 228         FILE *fp;
 229         char *fname;
 230
 231         if(invitation_key) {
 232                 ecdsa_free(invitation_key);
 233                 invitation_key = NULL;
 234         }
 235
 236         xasprintf(&fname, "%s" SLASH "invitations" SLASH "ecdsa_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 ECDSA private key file `%s' failed: %s", fname, strerror(errno));
 245         }
 246
 247         free(fname);
 248         return invitation_key;
 249 }
 250
 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                 free(fname);
 281                 return false;
 282         }
 283
 284 #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
 285         struct stat s;
 286
 287         if(fstat(fileno(fp), &s)) {
 288                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
 289                 free(fname);
 290                 return false;
 291         }
 292
 293         if(s.st_mode & ~0100700)
 294                 logger(DEBUG_ALWAYS, LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
 295 #endif
 296
 297         myself->connection->rsa = rsa_read_pem_private_key(fp);
 298         fclose(fp);
 299
 300         if(!myself->connection->rsa)
 301                 logger(DEBUG_ALWAYS, LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
 302         free(fname);
 303         return myself->connection->rsa;
 304 }
 305
 306 static timeout_t keyexpire_timeout;
 307
 308 static void keyexpire_handler(void *data) {
 309         regenerate_key();
 310         timeout_set(data, &(struct timeval){keylifetime, rand() % 100000});
 311 }
 312
 313 void regenerate_key(void) {
 314         logger(DEBUG_STATUS, LOG_INFO, "Expiring symmetric keys");
 315         send_key_changed();
 316 }
 317
 318 /*
 319   Read Subnets from all host config files
 320 */
 321 void load_all_subnets(void) {
 322         DIR *dir;
 323         struct dirent *ent;
 324         char *dname;
 325
 326         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 327         dir = opendir(dname);
 328         if(!dir) {
 329                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 330                 free(dname);
 331                 return;
 332         }
 333
 334         while((ent = readdir(dir))) {
 335                 if(!check_id(ent->d_name))
 336                         continue;
 337
 338                 node_t *n = lookup_node(ent->d_name);
 339                 #ifdef _DIRENT_HAVE_D_TYPE
 340                 //if(ent->d_type != DT_REG)
 341                 //      continue;
 342                 #endif
 343
 344                 splay_tree_t *config_tree;
 345                 init_configuration(&config_tree);
 346                 read_config_options(config_tree, ent->d_name);
 347                 read_host_config(config_tree, ent->d_name);
 348
 349                 if(!n) {
 350                         n = new_node();
 351                         n->name = xstrdup(ent->d_name);
 352                         node_add(n);
 353                 }
 354
 355                 for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 356                         subnet_t *s, *s2;
 357
 358                         if(!get_config_subnet(cfg, &s))
 359                                 continue;
 360
 361                         if((s2 = lookup_subnet(n, s))) {
 362                                 s2->expires = -1;
 363                         } else {
 364                                 subnet_add(n, s);
 365                         }
 366                 }
 367
 368                 exit_configuration(&config_tree);
 369         }
 370
 371         closedir(dir);
 372 }
 373
 374 void load_all_nodes(void) {
 375         DIR *dir;
 376         struct dirent *ent;
 377         char *dname;
 378
 379         xasprintf(&dname, "%s" SLASH "hosts", confbase);
 380         dir = opendir(dname);
 381         if(!dir) {
 382                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
 383                 free(dname);
 384                 return;
 385         }
 386
 387         while((ent = readdir(dir))) {
 388                 if(!check_id(ent->d_name))
 389                         continue;
 390
 391                 node_t *n = lookup_node(ent->d_name);
 392                 if(n)
 393                         continue;
 394
 395                 n = new_node();
 396                 n->name = xstrdup(ent->d_name);
 397                 node_add(n);
 398         }
 399
 400         closedir(dir);
 401 }
 402
 403
 404 char *get_name(void) {
 405         char *name = NULL;
 406
 407         get_config_string(lookup_config(config_tree, "Name"), &name);
 408
 409         if(!name)
 410                 return NULL;
 411
 412         if(*name == '$') {
 413                 char *envname = getenv(name + 1);
 414                 char hostname[32] = "";
 415                 if(!envname) {
 416                         if(strcmp(name + 1, "HOST")) {
 417                                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 418                                 return false;
 419                         }
 420                         if(gethostname(hostname, sizeof hostname) || !*hostname) {
 421                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 422                                 return false;
 423                         }
 424                         hostname[31] = 0;
 425                         envname = hostname;
 426                 }
 427                 free(name);
 428                 name = xstrdup(envname);
 429                 for(char *c = name; *c; c++)
 430                         if(!isalnum(*c))
 431                                 *c = '_';
 432         }
 433
 434         if(!check_id(name)) {
 435                 logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
 436                 free(name);
 437                 return false;
 438         }
 439
 440         return name;
 441 }
 442
 443 bool setup_myself_reloadable(void) {
 444         char *proxy = NULL;
 445         char *rmode = NULL;
 446         char *fmode = NULL;
 447         char *bmode = NULL;
 448         char *afname = NULL;
 449         char *address = NULL;
 450         char *space;
 451         bool choice;
 452
 453         free(scriptinterpreter);
 454         scriptinterpreter = NULL;
 455         get_config_string(lookup_config(config_tree, "ScriptsInterpreter"), &scriptinterpreter);
 456
 457
 458         free(scriptextension);
 459         if(!get_config_string(lookup_config(config_tree, "ScriptsExtension"), &scriptextension))
 460                 scriptextension = xstrdup("");
 461
 462         get_config_string(lookup_config(config_tree, "Proxy"), &proxy);
 463         if(proxy) {
 464                 if((space = strchr(proxy, ' ')))
 465                         *space++ = 0;
 466
 467                 if(!strcasecmp(proxy, "none")) {
 468                         proxytype = PROXY_NONE;
 469                 } else if(!strcasecmp(proxy, "socks4")) {
 470                         proxytype = PROXY_SOCKS4;
 471                 } else if(!strcasecmp(proxy, "socks4a")) {
 472                         proxytype = PROXY_SOCKS4A;
 473                 } else if(!strcasecmp(proxy, "socks5")) {
 474                         proxytype = PROXY_SOCKS5;
 475                 } else if(!strcasecmp(proxy, "http")) {
 476                         proxytype = PROXY_HTTP;
 477                 } else if(!strcasecmp(proxy, "exec")) {
 478                         proxytype = PROXY_EXEC;
 479                 } else {
 480                         logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type %s!", proxy);
 481                         return false;
 482                 }
 483
 484                 switch(proxytype) {
 485                         case PROXY_NONE:
 486                         default:
 487                                 break;
 488
 489                         case PROXY_EXEC:
 490                                 if(!space || !*space) {
 491                                         logger(DEBUG_ALWAYS, LOG_ERR, "Argument expected for proxy type exec!");
 492                                         return false;
 493                                 }
 494                                 proxyhost =  xstrdup(space);
 495                                 break;
 496
 497                         case PROXY_SOCKS4:
 498                         case PROXY_SOCKS4A:
 499                         case PROXY_SOCKS5:
 500                         case PROXY_HTTP:
 501                                 proxyhost = space;
 502                                 if(space && (space = strchr(space, ' ')))
 503                                         *space++ = 0, proxyport = space;
 504                                 if(space && (space = strchr(space, ' ')))
 505                                         *space++ = 0, proxyuser = space;
 506                                 if(space && (space = strchr(space, ' ')))
 507                                         *space++ = 0, proxypass = space;
 508                                 if(!proxyhost || !*proxyhost || !proxyport || !*proxyport) {
 509                                         logger(DEBUG_ALWAYS, LOG_ERR, "Host and port argument expected for proxy!");
 510                                         return false;
 511                                 }
 512                                 proxyhost = xstrdup(proxyhost);
 513                                 proxyport = xstrdup(proxyport);
 514                                 if(proxyuser && *proxyuser)
 515                                         proxyuser = xstrdup(proxyuser);
 516                                 if(proxypass && *proxypass)
 517                                         proxypass = xstrdup(proxypass);
 518                                 break;
 519                 }
 520
 521                 free(proxy);
 522         }
 523
 524         if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice) && choice)
 525                 myself->options |= OPTION_INDIRECT;
 526
 527         if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
 528                 myself->options |= OPTION_TCPONLY;
 529
 530         if(myself->options & OPTION_TCPONLY)
 531                 myself->options |= OPTION_INDIRECT;
 532
 533         get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
 534         get_config_bool(lookup_config(config_tree, "LocalDiscovery"), &localdiscovery);
 535
 536         memset(&localdiscovery_address, 0, sizeof localdiscovery_address);
 537         if(get_config_string(lookup_config(config_tree, "LocalDiscoveryAddress"), &address)) {
 538                 struct addrinfo *ai = str2addrinfo(address, myport, SOCK_DGRAM);
 539                 free(address);
 540                 if(!ai)
 541                         return false;
 542                 memcpy(&localdiscovery_address, ai->ai_addr, ai->ai_addrlen);
 543         }
 544
 545
 546         if(get_config_string(lookup_config(config_tree, "Mode"), &rmode)) {
 547                 if(!strcasecmp(rmode, "router"))
 548                         routing_mode = RMODE_ROUTER;
 549                 else if(!strcasecmp(rmode, "switch"))
 550                         routing_mode = RMODE_SWITCH;
 551                 else if(!strcasecmp(rmode, "hub"))
 552                         routing_mode = RMODE_HUB;
 553                 else {
 554                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid routing mode!");
 555                         return false;
 556                 }
 557                 free(rmode);
 558         }
 559
 560         if(get_config_string(lookup_config(config_tree, "Forwarding"), &fmode)) {
 561                 if(!strcasecmp(fmode, "off"))
 562                         forwarding_mode = FMODE_OFF;
 563                 else if(!strcasecmp(fmode, "internal"))
 564                         forwarding_mode = FMODE_INTERNAL;
 565                 else if(!strcasecmp(fmode, "kernel"))
 566                         forwarding_mode = FMODE_KERNEL;
 567                 else {
 568                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid forwarding mode!");
 569                         return false;
 570                 }
 571                 free(fmode);
 572         }
 573
 574         choice = true;
 575         get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
 576         if(choice)
 577                 myself->options |= OPTION_PMTU_DISCOVERY;
 578
 579         choice = true;
 580         get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
 581         if(choice)
 582                 myself->options |= OPTION_CLAMP_MSS;
 583
 584         get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 585         get_config_bool(lookup_config(config_tree, "DecrementTTL"), &decrement_ttl);
 586         if(get_config_string(lookup_config(config_tree, "Broadcast"), &bmode)) {
 587                 if(!strcasecmp(bmode, "no"))
 588                         broadcast_mode = BMODE_NONE;
 589                 else if(!strcasecmp(bmode, "yes") || !strcasecmp(bmode, "mst"))
 590                         broadcast_mode = BMODE_MST;
 591                 else if(!strcasecmp(bmode, "direct"))
 592                         broadcast_mode = BMODE_DIRECT;
 593                 else {
 594                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid broadcast mode!");
 595                         return false;
 596                 }
 597                 free(bmode);
 598         }
 599
 600 #if !defined(SOL_IP) || !defined(IP_TOS)
 601         if(priorityinheritance)
 602                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 603 #endif
 604
 605         if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
 606                 macexpire = 600;
 607
 608         if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 609                 if(maxtimeout <= 0) {
 610                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus maximum timeout!");
 611                         return false;
 612                 }
 613         } else
 614                 maxtimeout = 900;
 615
 616         if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
 617                 if(!strcasecmp(afname, "IPv4"))
 618                         addressfamily = AF_INET;
 619                 else if(!strcasecmp(afname, "IPv6"))
 620                         addressfamily = AF_INET6;
 621                 else if(!strcasecmp(afname, "any"))
 622                         addressfamily = AF_UNSPEC;
 623                 else {
 624                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid address family!");
 625                         return false;
 626                 }
 627                 free(afname);
 628         }
 629
 630         get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
 631
 632         if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
 633                 keylifetime = 3600;
 634
 635         get_config_int(lookup_config(config_tree, "AutoConnect"), &autoconnect);
 636         if(autoconnect < 0)
 637                 autoconnect = 0;
 638
 639         get_config_bool(lookup_config(config_tree, "DisableBuggyPeers"), &disablebuggypeers);
 640
 641         read_invitation_key();
 642
 643         return true;
 644 }
 645
 646 /*
 647   Configure node_t myself and set up the local sockets (listen only)
 648 */
 649 static bool setup_myself(void) {
 650         char *name, *hostname, *cipher, *digest, *type;
 651         char *address = NULL;
 652
 653         if(!(name = get_name())) {
 654                 logger(DEBUG_ALWAYS, LOG_ERR, "Name for tinc daemon required!");
 655                 return false;
 656         }
 657
 658         myself = new_node();
 659         myself->connection = new_connection();
 660         myself->name = name;
 661         myself->connection->name = xstrdup(name);
 662         read_host_config(config_tree, name);
 663
 664         if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 665                 myport = xstrdup("655");
 666
 667         xasprintf(&myself->hostname, "MYSELF port %s", myport);
 668         myself->connection->hostname = xstrdup(myself->hostname);
 669
 670         myself->connection->options = 0;
 671         myself->connection->protocol_major = PROT_MAJOR;
 672         myself->connection->protocol_minor = PROT_MINOR;
 673
 674         myself->options |= PROT_MINOR << 24;
 675
 676         get_config_bool(lookup_config(config_tree, "ExperimentalProtocol"), &experimental);
 677
 678         if(experimental && !read_ecdsa_private_key())
 679                 return false;
 680
 681         if(!read_rsa_private_key())
 682                 return false;
 683
 684         if(!atoi(myport)) {
 685                 struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
 686                 sockaddr_t sa;
 687                 if(!ai || !ai->ai_addr)
 688                         return false;
 689                 free(myport);
 690                 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
 691                 sockaddr2str(&sa, NULL, &myport);
 692         }
 693
 694         /* Read in all the subnets specified in the host configuration file */
 695
 696         for(config_t *cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 697                 subnet_t *subnet;
 698
 699                 if(!get_config_subnet(cfg, &subnet))
 700                         return false;
 701
 702                 subnet_add(myself, subnet);
 703         }
 704
 705         /* Check some options */
 706
 707         if(!setup_myself_reloadable())
 708                 return false;
 709
 710         get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 711         get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
 712         strictsubnets |= tunnelserver;
 713
 714         if(get_config_int(lookup_config(config_tree, "MaxConnectionBurst"), &max_connection_burst)) {
 715                 if(max_connection_burst <= 0) {
 716                         logger(DEBUG_ALWAYS, LOG_ERR, "MaxConnectionBurst cannot be negative!");
 717                         return false;
 718                 }
 719         }
 720
 721         if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
 722                 if(udp_rcvbuf <= 0) {
 723                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPRcvBuf cannot be negative!");
 724                         return false;
 725                 }
 726         }
 727
 728         if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
 729                 if(udp_sndbuf <= 0) {
 730                         logger(DEBUG_ALWAYS, LOG_ERR, "UDPSndBuf cannot be negative!");
 731                         return false;
 732                 }
 733         }
 734
 735         int replaywin_int;
 736         if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
 737                 if(replaywin_int < 0) {
 738                         logger(DEBUG_ALWAYS, LOG_ERR, "ReplayWindow cannot be negative!");
 739                         return false;
 740                 }
 741                 replaywin = (unsigned)replaywin_int;
 742                 sptps_replaywin = replaywin;
 743         }
 744
 745         /* Generate packet encryption key */
 746
 747         if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
 748                 cipher = xstrdup("blowfish");
 749
 750         if(!(myself->incipher = cipher_open_by_name(cipher))) {
 751                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized cipher type!");
 752                 return false;
 753         }
 754
 755         free(cipher);
 756
 757         timeout_add(&keyexpire_timeout, keyexpire_handler, &keyexpire_timeout, &(struct timeval){keylifetime, rand() % 100000});
 758
 759         /* Check if we want to use message authentication codes... */
 760
 761         int maclength = 4;
 762         get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
 763
 764         if(maclength < 0) {
 765                 logger(DEBUG_ALWAYS, LOG_ERR, "Bogus MAC length!");
 766                 return false;
 767         }
 768
 769         if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
 770                 digest = xstrdup("sha1");
 771
 772         if(!(myself->indigest = digest_open_by_name(digest, maclength))) {
 773                 logger(DEBUG_ALWAYS, LOG_ERR, "Unrecognized digest type!");
 774                 return false;
 775         }
 776
 777         free(digest);
 778
 779         /* Compression */
 780
 781         if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
 782                 if(myself->incompression < 0 || myself->incompression > 11) {
 783                         logger(DEBUG_ALWAYS, LOG_ERR, "Bogus compression level!");
 784                         return false;
 785                 }
 786         } else
 787                 myself->incompression = 0;
 788
 789         myself->connection->outcompression = 0;
 790
 791         /* Done */
 792
 793         myself->nexthop = myself;
 794         myself->via = myself;
 795         myself->status.reachable = true;
 796         myself->last_state_change = now.tv_sec;
 797         myself->status.sptps = experimental;
 798         node_add(myself);
 799
 800         graph();
 801
 802         if(strictsubnets)
 803                 load_all_subnets();
 804         else if(autoconnect)
 805                 load_all_nodes();
 806
 807         /* Open device */
 808
 809         devops = os_devops;
 810
 811         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
 812                 if(!strcasecmp(type, "dummy"))
 813                         devops = dummy_devops;
 814                 else if(!strcasecmp(type, "raw_socket"))
 815                         devops = raw_socket_devops;
 816                 else if(!strcasecmp(type, "multicast"))
 817                         devops = multicast_devops;
 818 #ifdef ENABLE_UML
 819                 else if(!strcasecmp(type, "uml"))
 820                         devops = uml_devops;
 821 #endif
 822 #ifdef ENABLE_VDE
 823                 else if(!strcasecmp(type, "vde"))
 824                         devops = vde_devops;
 825 #endif
 826         }
 827
 828         if(!devops.setup())
 829                 return false;
 830
 831         if(device_fd >= 0)
 832                 io_add(&device_io, handle_device_data, NULL, device_fd, IO_READ);
 833
 834         /* Open sockets */
 835
 836         if(!do_detach && getenv("LISTEN_FDS")) {
 837                 sockaddr_t sa;
 838                 socklen_t salen;
 839
 840                 listen_sockets = atoi(getenv("LISTEN_FDS"));
 841 #ifdef HAVE_UNSETENV
 842                 unsetenv("LISTEN_FDS");
 843 #endif
 844
 845                 if(listen_sockets > MAXSOCKETS) {
 846                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 847                         return false;
 848                 }
 849
 850                 for(int i = 0; i < listen_sockets; i++) {
 851                         salen = sizeof sa;
 852                         if(getsockname(i + 3, &sa.sa, &salen) < 0) {
 853                                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not get address of listen fd %d: %s", i + 3, sockstrerror(errno));
 854                                 return false;
 855                         }
 856
 857 #ifdef FD_CLOEXEC
 858                         fcntl(i + 3, F_SETFD, FD_CLOEXEC);
 859 #endif
 860
 861                         int udp_fd = setup_vpn_in_socket(&sa);
 862                         if(udp_fd < 0)
 863                                 return false;
 864
 865                         io_add(&listen_socket[i].tcp, (io_cb_t)handle_new_meta_connection, &listen_socket[i], i + 3, IO_READ);
 866                         io_add(&listen_socket[i].udp, (io_cb_t)handle_incoming_vpn_data, &listen_socket[i], udp_fd, IO_READ);
 867
 868                         if(debug_level >= DEBUG_CONNECTIONS) {
 869                                 hostname = sockaddr2hostname(&sa);
 870                                 logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 871                                 free(hostname);
 872                         }
 873
 874                         memcpy(&listen_socket[i].sa, &sa, salen);
 875                 }
 876         } else {
 877                 listen_sockets = 0;
 878                 config_t *cfg = lookup_config(config_tree, "BindToAddress");
 879
 880                 do {
 881                         get_config_string(cfg, &address);
 882                         if(cfg)
 883                                 cfg = lookup_config_next(config_tree, cfg);
 884
 885                         char *port = myport;
 886
 887                         if(address) {
 888                                 char *space = strchr(address, ' ');
 889                                 if(space) {
 890                                         *space++ = 0;
 891                                         port = space;
 892                                 }
 893
 894                                 if(!strcmp(address, "*"))
 895                                         *address = 0;
 896                         }
 897
 898                         struct addrinfo *ai, hint = {0};
 899                         hint.ai_family = addressfamily;
 900                         hint.ai_socktype = SOCK_STREAM;
 901                         hint.ai_protocol = IPPROTO_TCP;
 902                         hint.ai_flags = AI_PASSIVE;
 903
 904                         int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
 905                         free(address);
 906
 907                         if(err || !ai) {
 908                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
 909                                 return false;
 910                         }
 911
 912                         for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 913                                 if(listen_sockets >= MAXSOCKETS) {
 914                                         logger(DEBUG_ALWAYS, LOG_ERR, "Too many listening sockets");
 915                                         return false;
 916                                 }
 917
 918                                 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
 919
 920                                 if(tcp_fd < 0)
 921                                         continue;
 922
 923                                 int udp_fd = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
 924
 925                                 if(tcp_fd < 0) {
 926                                         close(tcp_fd);
 927                                         continue;
 928                                 }
 929
 930                                 io_add(&listen_socket[listen_sockets].tcp, handle_new_meta_connection, &listen_socket[listen_sockets], tcp_fd, IO_READ);
 931                                 io_add(&listen_socket[listen_sockets].udp, handle_incoming_vpn_data, &listen_socket[listen_sockets], udp_fd, IO_READ);
 932
 933                                 if(debug_level >= DEBUG_CONNECTIONS) {
 934                                         hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
 935                                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Listening on %s", hostname);
 936                                         free(hostname);
 937                                 }
 938
 939                                 memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
 940                                 listen_sockets++;
 941                         }
 942
 943                         freeaddrinfo(ai);
 944                 } while(cfg);
 945         }
 946
 947         if(!listen_sockets) {
 948                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to create any listening socket!");
 949                 return false;
 950         }
 951
 952         last_config_check = now.tv_sec;
 953
 954         return true;
 955 }
 956
 957 /*
 958   initialize network
 959 */
 960 bool setup_network(void) {
 961         init_connections();
 962         init_subnets();
 963         init_nodes();
 964         init_edges();
 965         init_requests();
 966
 967         if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
 968                 if(pinginterval < 1) {
 969                         pinginterval = 86400;
 970                 }
 971         } else
 972                 pinginterval = 60;
 973
 974         if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
 975                 pingtimeout = 5;
 976         if(pingtimeout < 1 || pingtimeout > pinginterval)
 977                 pingtimeout = pinginterval;
 978
 979         if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
 980                 maxoutbufsize = 10 * MTU;
 981
 982         if(!setup_myself())
 983                 return false;
 984
 985         if(!init_control())
 986                 return false;
 987
 988         /* Run tinc-up script to further initialize the tap interface */
 989
 990         char *envp[5] = {NULL};
 991         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 992         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 993         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 994         xasprintf(&envp[3], "NAME=%s", myself->name);
 995
 996         execute_script("tinc-up", envp);
 997
 998         for(int i = 0; i < 4; i++)
 999                 free(envp[i]);
1000
1001         /* Run subnet-up scripts for our own subnets */
1002
1003         subnet_update(myself, NULL, true);
1004
1005         return true;
1006 }
1007
1008 /*
1009   close all open network connections
1010 */
1011 void close_network_connections(void) {
1012         for(list_node_t *node = connection_list->head, *next; node; node = next) {
1013                 next = node->next;
1014                 connection_t *c = node->data;
1015                 /* Keep control connections open until the end, so they know when we really terminated */
1016                 if(c->status.control)
1017                         c->socket = -1;
1018                 c->outgoing = NULL;
1019                 terminate_connection(c, false);
1020         }
1021
1022         list_delete_list(outgoing_list);
1023
1024         if(myself && myself->connection) {
1025                 subnet_update(myself, NULL, false);
1026                 terminate_connection(myself->connection, false);
1027                 free_connection(myself->connection);
1028         }
1029
1030         for(int i = 0; i < listen_sockets; i++) {
1031                 io_del(&listen_socket[i].tcp);
1032                 io_del(&listen_socket[i].udp);
1033                 close(listen_socket[i].tcp.fd);
1034                 close(listen_socket[i].udp.fd);
1035         }
1036
1037         char *envp[5] = {NULL};
1038         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
1039         xasprintf(&envp[1], "DEVICE=%s", device ? : "");
1040         xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
1041         xasprintf(&envp[3], "NAME=%s", myself->name);
1042
1043         exit_requests();
1044         exit_edges();
1045         exit_subnets();
1046         exit_nodes();
1047         exit_connections();
1048
1049         execute_script("tinc-down", envp);
1050
1051         if(myport) free(myport);
1052
1053         for(int i = 0; i < 4; i++)
1054                 free(envp[i]);
1055
1056         devops.close();
1057
1058         exit_control();
1059
1060         return;
1061 }