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

   1 /*
   2     tincd.c -- the main file for tincd
   3     Copyright (C) 1998-2005 Ivo Timmermans
   4                   2000-2009 Guus Sliepen <guus@tinc-vpn.org>
   5                   2009      Michael Tokarev <mjt@tls.msk.ru>
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21     $Id$
  22 */
  23
  24 #include "system.h"
  25
  26 /* Darwin (MacOS/X) needs the following definition... */
  27 #ifndef _P1003_1B_VISIBLE
  28 #define _P1003_1B_VISIBLE
  29 #endif
  30
  31 #ifdef HAVE_SYS_MMAN_H
  32 #include <sys/mman.h>
  33 #endif
  34
  35 #include <openssl/rand.h>
  36 #include <openssl/rsa.h>
  37 #include <openssl/pem.h>
  38 #include <openssl/evp.h>
  39 #include <openssl/engine.h>
  40
  41 #include LZO1X_H
  42
  43 #ifndef HAVE_MINGW
  44 #include <pwd.h>
  45 #include <grp.h>
  46 #include <time.h>
  47 #endif
  48
  49 #include <getopt.h>
  50 #include "pidfile.h"
  51
  52 #include "conf.h"
  53 #include "device.h"
  54 #include "logger.h"
  55 #include "net.h"
  56 #include "netutl.h"
  57 #include "process.h"
  58 #include "protocol.h"
  59 #include "utils.h"
  60 #include "xalloc.h"
  61
  62 /* The name this program was run with. */
  63 char *program_name = NULL;
  64
  65 /* If nonzero, display usage information and exit. */
  66 bool show_help = false;
  67
  68 /* If nonzero, print the version on standard output and exit.  */
  69 bool show_version = false;
  70
  71 /* If nonzero, it will attempt to kill a running tincd and exit. */
  72 int kill_tincd = 0;
  73
  74 /* If nonzero, generate public/private keypair for this host/net. */
  75 int generate_keys = 0;
  76
  77 /* If nonzero, use null ciphers and skip all key exchanges. */
  78 bool bypass_security = false;
  79
  80 /* If nonzero, disable swapping for this process. */
  81 bool do_mlock = false;
  82
  83 /* If nonzero, chroot to netdir after startup. */
  84 static bool do_chroot = false;
  85
  86 /* If !NULL, do setuid to given user after startup */
  87 static const char *switchuser = NULL;
  88
  89 /* If nonzero, write log entries to a separate file. */
  90 bool use_logfile = false;
  91
  92 char *identname = NULL;                         /* program name for syslog */
  93 char *pidfilename = NULL;                       /* pid file location */
  94 char *logfilename = NULL;                       /* log file location */
  95 char **g_argv;                                  /* a copy of the cmdline arguments */
  96
  97 static int status;
  98
  99 static struct option const long_options[] = {
 100         {"config", required_argument, NULL, 'c'},
 101         {"kill", optional_argument, NULL, 'k'},
 102         {"net", required_argument, NULL, 'n'},
 103         {"help", no_argument, NULL, 1},
 104         {"version", no_argument, NULL, 2},
 105         {"no-detach", no_argument, NULL, 'D'},
 106         {"generate-keys", optional_argument, NULL, 'K'},
 107         {"debug", optional_argument, NULL, 'd'},
 108         {"bypass-security", no_argument, NULL, 3},
 109         {"mlock", no_argument, NULL, 'L'},
 110         {"chroot", no_argument, NULL, 'R'},
 111         {"user", required_argument, NULL, 'U'},
 112         {"logfile", optional_argument, NULL, 4},
 113         {"pidfile", required_argument, NULL, 5},
 114         {NULL, 0, NULL, 0}
 115 };
 116
 117 #ifdef HAVE_MINGW
 118 static struct WSAData wsa_state;
 119 CRITICAL_SECTION mutex;
 120 #endif
 121
 122 static void usage(bool status)
 123 {
 124         if(status)
 125                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
 126                                 program_name);
 127         else {
 128                 printf(_("Usage: %s [option]...\n\n"), program_name);
 129                 printf(_("  -c, --config=DIR           Read configuration options from DIR.\n"
 130                                 "  -D, --no-detach            Don't fork and detach.\n"
 131                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 132                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 133                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 134                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 135                                 "  -L, --mlock                Lock tinc into main memory.\n"
 136                                 "      --logfile[=FILENAME]   Write log entries to a logfile.\n"
 137                                 "      --pidfile=FILENAME     Write PID to FILENAME.\n"
 138                                 "  -R, --chroot               chroot to NET dir at startup.\n"
 139                                 "  -U, --user=USER            setuid to given USER at startup.\n"
 140                                 "      --help                 Display this help and exit.\n"
 141                                 "      --version              Output version information and exit.\n\n"));
 142                 printf(_("Report bugs to tinc@tinc-vpn.org.\n"));
 143         }
 144 }
 145
 146 static bool parse_options(int argc, char **argv)
 147 {
 148         int r;
 149         int option_index = 0;
 150
 151         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::RU:", long_options, &option_index)) != EOF) {
 152                 switch (r) {
 153                         case 0:                         /* long option */
 154                                 break;
 155
 156                         case 'c':                               /* config file */
 157                                 confbase = xstrdup(optarg);
 158                                 break;
 159
 160                         case 'D':                               /* no detach */
 161                                 do_detach = false;
 162                                 break;
 163
 164                         case 'L':                               /* no detach */
 165 #ifndef HAVE_MLOCKALL
 166                                 logger(LOG_ERR, _("%s not supported on this platform"), "mlockall()");
 167                                 return false;
 168 #else
 169                                 do_mlock = true;
 170                                 break;
 171 #endif
 172
 173                         case 'd':                               /* inc debug level */
 174                                 if(optarg)
 175                                         debug_level = atoi(optarg);
 176                                 else
 177                                         debug_level++;
 178                                 break;
 179
 180                         case 'k':                               /* kill old tincds */
 181 #ifndef HAVE_MINGW
 182                                 if(optarg) {
 183                                         if(!strcasecmp(optarg, "HUP"))
 184                                                 kill_tincd = SIGHUP;
 185                                         else if(!strcasecmp(optarg, "TERM"))
 186                                                 kill_tincd = SIGTERM;
 187                                         else if(!strcasecmp(optarg, "KILL"))
 188                                                 kill_tincd = SIGKILL;
 189                                         else if(!strcasecmp(optarg, "USR1"))
 190                                                 kill_tincd = SIGUSR1;
 191                                         else if(!strcasecmp(optarg, "USR2"))
 192                                                 kill_tincd = SIGUSR2;
 193                                         else if(!strcasecmp(optarg, "WINCH"))
 194                                                 kill_tincd = SIGWINCH;
 195                                         else if(!strcasecmp(optarg, "INT"))
 196                                                 kill_tincd = SIGINT;
 197                                         else if(!strcasecmp(optarg, "ALRM"))
 198                                                 kill_tincd = SIGALRM;
 199                                         else {
 200                                                 kill_tincd = atoi(optarg);
 201
 202                                                 if(!kill_tincd) {
 203                                                         fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
 204                                                                         optarg);
 205                                                         usage(true);
 206                                                         return false;
 207                                                 }
 208                                         }
 209                                 } else
 210                                         kill_tincd = SIGTERM;
 211 #else
 212                                         kill_tincd = 1;
 213 #endif
 214                                 break;
 215
 216                         case 'n':                               /* net name given */
 217                                 netname = xstrdup(optarg);
 218                                 break;
 219
 220                         case 'K':                               /* generate public/private keypair */
 221                                 if(optarg) {
 222                                         generate_keys = atoi(optarg);
 223
 224                                         if(generate_keys < 512) {
 225                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 226                                                                 optarg);
 227                                                 usage(true);
 228                                                 return false;
 229                                         }
 230
 231                                         generate_keys &= ~7;    /* Round it to bytes */
 232                                 } else
 233                                         generate_keys = 2048;
 234                                 break;
 235
 236                         case 'R':                               /* chroot to NETNAME dir */
 237                                 do_chroot = true;
 238                                 break;
 239
 240                         case 'U':                               /* setuid to USER */
 241                                 switchuser = optarg;
 242                                 break;
 243
 244                         case 1:                                 /* show help */
 245                                 show_help = true;
 246                                 break;
 247
 248                         case 2:                                 /* show version */
 249                                 show_version = true;
 250                                 break;
 251
 252                         case 3:                                 /* bypass security */
 253                                 bypass_security = true;
 254                                 break;
 255
 256                         case 4:                                 /* write log entries to a file */
 257                                 use_logfile = true;
 258                                 if(optarg)
 259                                         logfilename = xstrdup(optarg);
 260                                 break;
 261
 262                         case 5:                                 /* write PID to a file */
 263                                 pidfilename = xstrdup(optarg);
 264                                 break;
 265
 266                         case '?':
 267                                 usage(true);
 268                                 return false;
 269
 270                         default:
 271                                 break;
 272                 }
 273         }
 274
 275         return true;
 276 }
 277
 278 /* This function prettyprints the key generation process */
 279
 280 static void indicator(int a, int b, void *p)
 281 {
 282         switch (a) {
 283                 case 0:
 284                         fprintf(stderr, ".");
 285                         break;
 286
 287                 case 1:
 288                         fprintf(stderr, "+");
 289                         break;
 290
 291                 case 2:
 292                         fprintf(stderr, "-");
 293                         break;
 294
 295                 case 3:
 296                         switch (b) {
 297                                 case 0:
 298                                         fprintf(stderr, " p\n");
 299                                         break;
 300
 301                                 case 1:
 302                                         fprintf(stderr, " q\n");
 303                                         break;
 304
 305                                 default:
 306                                         fprintf(stderr, "?");
 307                         }
 308                         break;
 309
 310                 default:
 311                         fprintf(stderr, "?");
 312         }
 313 }
 314
 315 /*
 316   Generate a public/private RSA keypair, and ask for a file to store
 317   them in.
 318 */
 319 static bool keygen(int bits)
 320 {
 321         RSA *rsa_key;
 322         FILE *f;
 323         char *name = NULL;
 324         char *filename;
 325
 326         get_config_string(lookup_config(config_tree, "Name"), &name);
 327
 328         if(name && !check_id(name)) {
 329                 fprintf(stderr, _("Invalid name for myself!\n"));
 330                 return false;
 331         }
 332
 333         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 334         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 335
 336         if(!rsa_key) {
 337                 fprintf(stderr, _("Error during key generation!\n"));
 338                 return false;
 339         } else
 340                 fprintf(stderr, _("Done.\n"));
 341
 342         xasprintf(&filename, "%s/rsa_key.priv", confbase);
 343         f = ask_and_open(filename, _("private RSA key"));
 344
 345         if(!f)
 346                 return false;
 347
 348         if(disable_old_keys(f))
 349                 fprintf(stderr, _("Warning: old key(s) found and disabled.\n"));
 350
 351 #ifdef HAVE_FCHMOD
 352         /* Make it unreadable for others. */
 353         fchmod(fileno(f), 0600);
 354 #endif
 355
 356         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 357         fclose(f);
 358         free(filename);
 359
 360         if(name)
 361                 xasprintf(&filename, "%s/hosts/%s", confbase, name);
 362         else
 363                 xasprintf(&filename, "%s/rsa_key.pub", confbase);
 364
 365         f = ask_and_open(filename, _("public RSA key"));
 366
 367         if(!f)
 368                 return false;
 369
 370         if(disable_old_keys(f))
 371                 fprintf(stderr, _("Warning: old key(s) found and disabled.\n"));
 372
 373         PEM_write_RSAPublicKey(f, rsa_key);
 374         fclose(f);
 375         free(filename);
 376         if(name)
 377                 free(name);
 378
 379         return true;
 380 }
 381
 382 /*
 383   Set all files and paths according to netname
 384 */
 385 static void make_names(void)
 386 {
 387 #ifdef HAVE_MINGW
 388         HKEY key;
 389         char installdir[1024] = "";
 390         long len = sizeof(installdir);
 391 #endif
 392
 393         if(netname)
 394                 xasprintf(&identname, "tinc.%s", netname);
 395         else
 396                 identname = xstrdup("tinc");
 397
 398 #ifdef HAVE_MINGW
 399         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 400                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 401                         if(!logfilename)
 402                                 xasprintf(&logfilename, "%s/log/%s.log", identname);
 403                         if(!confbase) {
 404                                 if(netname)
 405                                         xasprintf(&confbase, "%s/%s", installdir, netname);
 406                                 else
 407                                         xasprintf(&confbase, "%s", installdir);
 408                         }
 409                 }
 410                 RegCloseKey(key);
 411                 if(*installdir)
 412                         return;
 413         }
 414 #endif
 415
 416         if(!pidfilename)
 417                 xasprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 418
 419         if(!logfilename)
 420                 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 421
 422         if(netname) {
 423                 if(!confbase)
 424                         xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
 425                 else
 426                         logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 427         } else {
 428                 if(!confbase)
 429                         xasprintf(&confbase, CONFDIR "/tinc");
 430         }
 431 }
 432
 433 static void free_names() {
 434         if (identname) free(identname);
 435         if (netname) free(netname);
 436         if (pidfilename) free(pidfilename);
 437         if (logfilename) free(logfilename);
 438         if (confbase) free(confbase);
 439 }
 440
 441 static bool drop_privs() {
 442 #ifdef HAVE_MINGW
 443         if (switchuser) {
 444                 logger(LOG_ERR, _("%s not supported on this platform"), "-U");
 445                 return false;
 446         }
 447         if (do_chroot) {
 448                 logger(LOG_ERR, _("%s not supported on this platform"), "-R");
 449                 return false;
 450         }
 451 #else
 452         uid_t uid = 0;
 453         if (switchuser) {
 454                 struct passwd *pw = getpwnam(switchuser);
 455                 if (!pw) {
 456                         logger(LOG_ERR, _("unknown user `%s'"), switchuser);
 457                         return false;
 458                 }
 459                 uid = pw->pw_uid;
 460                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 461                     setgid(pw->pw_gid) != 0) {
 462                         logger(LOG_ERR, _("System call `%s' failed: %s"),
 463                                "initgroups", strerror(errno));
 464                         return false;
 465                 }
 466                 endgrent();
 467                 endpwent();
 468         }
 469         if (do_chroot) {
 470                 tzset();        /* for proper timestamps in logs */
 471                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 472                         logger(LOG_ERR, _("System call `%s' failed: %s"),
 473                                "chroot", strerror(errno));
 474                         return false;
 475                 }
 476                 free(confbase);
 477                 confbase = xstrdup("");
 478         }
 479         if (switchuser)
 480                 if (setuid(uid) != 0) {
 481                         logger(LOG_ERR, _("System call `%s' failed: %s"),
 482                                "setuid", strerror(errno));
 483                         return false;
 484                 }
 485 #endif
 486         return true;
 487 }
 488
 489 #ifdef HAVE_MINGW
 490 # define setpriority(level) SetPriorityClass(GetCurrentProcess(), level)
 491 #else
 492 # define NORMAL_PRIORITY_CLASS 0
 493 # define BELOW_NORMAL_PRIORITY_CLASS 10
 494 # define HIGH_PRIORITY_CLASS -10
 495 # define setpriority(level) nice(level)
 496 #endif
 497
 498 int main(int argc, char **argv)
 499 {
 500         program_name = argv[0];
 501
 502         setlocale(LC_ALL, "");
 503         bindtextdomain(PACKAGE, LOCALEDIR);
 504         textdomain(PACKAGE);
 505
 506         if(!parse_options(argc, argv))
 507                 return 1;
 508
 509         make_names();
 510
 511         if(show_version) {
 512                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 513                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 514                 printf(_("Copyright (C) 1998-2009 Ivo Timmermans, Guus Sliepen and others.\n"
 515                                 "See the AUTHORS file for a complete list.\n\n"
 516                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 517                                 "and you are welcome to redistribute it under certain conditions;\n"
 518                                 "see the file COPYING for details.\n"));
 519
 520                 return 0;
 521         }
 522
 523         if(show_help) {
 524                 usage(false);
 525                 return 0;
 526         }
 527
 528         if(kill_tincd)
 529                 return !kill_other(kill_tincd);
 530
 531         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 532
 533         g_argv = argv;
 534
 535         init_configuration(&config_tree);
 536
 537         /* Slllluuuuuuurrrrp! */
 538
 539         RAND_load_file("/dev/urandom", 1024);
 540
 541         ENGINE_load_builtin_engines();
 542         ENGINE_register_all_complete();
 543
 544         OpenSSL_add_all_algorithms();
 545
 546         if(generate_keys) {
 547                 read_server_config();
 548                 return !keygen(generate_keys);
 549         }
 550
 551         if(!read_server_config())
 552                 return 1;
 553
 554         if(lzo_init() != LZO_E_OK) {
 555                 logger(LOG_ERR, _("Error initializing LZO compressor!"));
 556                 return 1;
 557         }
 558
 559 #ifdef HAVE_MINGW
 560         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 561                 logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError()));
 562                 return 1;
 563         }
 564
 565         if(!do_detach || !init_service())
 566                 return main2(argc, argv);
 567         else
 568                 return 1;
 569 }
 570
 571 int main2(int argc, char **argv)
 572 {
 573         InitializeCriticalSection(&mutex);
 574         EnterCriticalSection(&mutex);
 575 #endif
 576
 577         if(!detach())
 578                 return 1;
 579
 580 #ifdef HAVE_MLOCKALL
 581         /* Lock all pages into memory if requested.
 582          * This has to be done after daemon()/fork() so it works for child.
 583          * No need to do that in parent as it's very short-lived. */
 584         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 585                 logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 586                    strerror(errno));
 587                 return 1;
 588         }
 589 #endif
 590
 591         /* Setup sockets and open device. */
 592
 593         if(!setup_network())
 594                 goto end;
 595
 596         /* Initiate all outgoing connections. */
 597
 598         try_outgoing_connections();
 599
 600         /* Change process priority */
 601
 602         char *priority = 0;
 603
 604         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 605                 if(!strcasecmp(priority, "Normal"))
 606                         setpriority(NORMAL_PRIORITY_CLASS);
 607                 else if(!strcasecmp(priority, "Low"))
 608                         setpriority(BELOW_NORMAL_PRIORITY_CLASS);
 609                 else if(!strcasecmp(priority, "High"))
 610                         setpriority(HIGH_PRIORITY_CLASS);
 611                 else {
 612                         logger(LOG_ERR, _("Invalid priority `%s`!"), priority);
 613                         goto end;
 614                 }
 615         }
 616
 617         /* drop privileges */
 618         if (!drop_privs())
 619                 goto end;
 620
 621         /* Start main loop. It only exits when tinc is killed. */
 622
 623         status = main_loop();
 624
 625         /* Shutdown properly. */
 626
 627         ifdebug(CONNECTIONS)
 628                 dump_device_stats();
 629
 630         close_network_connections();
 631
 632 end:
 633         logger(LOG_NOTICE, _("Terminating"));
 634
 635 #ifndef HAVE_MINGW
 636         remove_pid(pidfilename);
 637 #endif
 638
 639         EVP_cleanup();
 640         ENGINE_cleanup();
 641         CRYPTO_cleanup_all_ex_data();
 642         ERR_remove_state(0);
 643         ERR_free_strings();
 644
 645         exit_configuration(&config_tree);
 646         free_names();
 647
 648         return status;
 649 }