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