www.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 along
  18     with this program; if not, write to the Free Software Foundation, Inc.,
  19     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20 */
  21
  22 #include "system.h"
  23
  24 /* Darwin (MacOS/X) needs the following definition... */
  25 #ifndef _P1003_1B_VISIBLE
  26 #define _P1003_1B_VISIBLE
  27 #endif
  28
  29 #ifdef HAVE_SYS_MMAN_H
  30 #include <sys/mman.h>
  31 #endif
  32
  33 #include <openssl/rand.h>
  34 #include <openssl/rsa.h>
  35 #include <openssl/pem.h>
  36 #include <openssl/evp.h>
  37 #include <openssl/engine.h>
  38
  39 #include LZO1X_H
  40
  41 #ifndef HAVE_MINGW
  42 #include <pwd.h>
  43 #include <grp.h>
  44 #include <time.h>
  45 #endif
  46
  47 #include <getopt.h>
  48 #include "pidfile.h"
  49
  50 #include "conf.h"
  51 #include "device.h"
  52 #include "logger.h"
  53 #include "net.h"
  54 #include "netutl.h"
  55 #include "process.h"
  56 #include "protocol.h"
  57 #include "utils.h"
  58 #include "xalloc.h"
  59
  60 /* The name this program was run with. */
  61 char *program_name = NULL;
  62
  63 /* If nonzero, display usage information and exit. */
  64 bool show_help = false;
  65
  66 /* If nonzero, print the version on standard output and exit.  */
  67 bool show_version = false;
  68
  69 /* If nonzero, it will attempt to kill a running tincd and exit. */
  70 int kill_tincd = 0;
  71
  72 /* If nonzero, generate public/private keypair for this host/net. */
  73 int generate_keys = 0;
  74
  75 /* If nonzero, use null ciphers and skip all key exchanges. */
  76 bool bypass_security = false;
  77
  78 /* If nonzero, disable swapping for this process. */
  79 bool do_mlock = false;
  80
  81 /* If nonzero, chroot to netdir after startup. */
  82 static bool do_chroot = false;
  83
  84 /* If !NULL, do setuid to given user after startup */
  85 static const char *switchuser = NULL;
  86
  87 /* If nonzero, write log entries to a separate file. */
  88 bool use_logfile = false;
  89
  90 char *identname = NULL;                         /* program name for syslog */
  91 char *pidfilename = NULL;                       /* pid file location */
  92 char *logfilename = NULL;                       /* log file location */
  93 char **g_argv;                                  /* a copy of the cmdline arguments */
  94
  95 static int status;
  96
  97 static struct option const long_options[] = {
  98         {"config", required_argument, NULL, 'c'},
  99         {"kill", optional_argument, NULL, 'k'},
 100         {"net", required_argument, NULL, 'n'},
 101         {"help", no_argument, NULL, 1},
 102         {"version", no_argument, NULL, 2},
 103         {"no-detach", no_argument, NULL, 'D'},
 104         {"generate-keys", optional_argument, NULL, 'K'},
 105         {"debug", optional_argument, NULL, 'd'},
 106         {"bypass-security", no_argument, NULL, 3},
 107         {"mlock", no_argument, NULL, 'L'},
 108         {"chroot", no_argument, NULL, 'R'},
 109         {"user", required_argument, NULL, 'U'},
 110         {"logfile", optional_argument, NULL, 4},
 111         {"pidfile", required_argument, NULL, 5},
 112         {NULL, 0, NULL, 0}
 113 };
 114
 115 #ifdef HAVE_MINGW
 116 static struct WSAData wsa_state;
 117 CRITICAL_SECTION mutex;
 118 #endif
 119
 120 static void usage(bool status) {
 121         if(status)
 122                 fprintf(stderr, "Try `%s --help\' for more information.\n",
 123                                 program_name);
 124         else {
 125                 printf("Usage: %s [option]...\n\n", program_name);
 126                 printf("  -c, --config=DIR           Read configuration options from DIR.\n"
 127                                 "  -D, --no-detach            Don't fork and detach.\n"
 128                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 129                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 130                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 131                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 132                                 "  -L, --mlock                Lock tinc into main memory.\n"
 133                                 "      --logfile[=FILENAME]   Write log entries to a logfile.\n"
 134                                 "      --pidfile=FILENAME     Write PID to FILENAME.\n"
 135                                 "  -R, --chroot               chroot to NET dir at startup.\n"
 136                                 "  -U, --user=USER            setuid to given USER at startup.\n"
 137                                 "      --help                 Display this help and exit.\n"
 138                                 "      --version              Output version information and exit.\n\n");
 139                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 140         }
 141 }
 142
 143 static bool parse_options(int argc, char **argv) {
 144         int r;
 145         int option_index = 0;
 146
 147         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::RU:", long_options, &option_index)) != EOF) {
 148                 switch (r) {
 149                         case 0:                         /* long option */
 150                                 break;
 151
 152                         case 'c':                               /* config file */
 153                                 confbase = xstrdup(optarg);
 154                                 break;
 155
 156                         case 'D':                               /* no detach */
 157                                 do_detach = false;
 158                                 break;
 159
 160                         case 'L':                               /* no detach */
 161 #ifndef HAVE_MLOCKALL
 162                                 logger(LOG_ERR, "%s not supported on this platform", "mlockall()");
 163                                 return false;
 164 #else
 165                                 do_mlock = true;
 166                                 break;
 167 #endif
 168
 169                         case 'd':                               /* inc debug level */
 170                                 if(optarg)
 171                                         debug_level = atoi(optarg);
 172                                 else
 173                                         debug_level++;
 174                                 break;
 175
 176                         case 'k':                               /* kill old tincds */
 177 #ifndef HAVE_MINGW
 178                                 if(optarg) {
 179                                         if(!strcasecmp(optarg, "HUP"))
 180                                                 kill_tincd = SIGHUP;
 181                                         else if(!strcasecmp(optarg, "TERM"))
 182                                                 kill_tincd = SIGTERM;
 183                                         else if(!strcasecmp(optarg, "KILL"))
 184                                                 kill_tincd = SIGKILL;
 185                                         else if(!strcasecmp(optarg, "USR1"))
 186                                                 kill_tincd = SIGUSR1;
 187                                         else if(!strcasecmp(optarg, "USR2"))
 188                                                 kill_tincd = SIGUSR2;
 189                                         else if(!strcasecmp(optarg, "WINCH"))
 190                                                 kill_tincd = SIGWINCH;
 191                                         else if(!strcasecmp(optarg, "INT"))
 192                                                 kill_tincd = SIGINT;
 193                                         else if(!strcasecmp(optarg, "ALRM"))
 194                                                 kill_tincd = SIGALRM;
 195                                         else {
 196                                                 kill_tincd = atoi(optarg);
 197
 198                                                 if(!kill_tincd) {
 199                                                         fprintf(stderr, "Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n",
 200                                                                         optarg);
 201                                                         usage(true);
 202                                                         return false;
 203                                                 }
 204                                         }
 205                                 } else
 206                                         kill_tincd = SIGTERM;
 207 #else
 208                                         kill_tincd = 1;
 209 #endif
 210                                 break;
 211
 212                         case 'n':                               /* net name given */
 213                                 netname = xstrdup(optarg);
 214                                 break;
 215
 216                         case 'K':                               /* generate public/private keypair */
 217                                 if(optarg) {
 218                                         generate_keys = atoi(optarg);
 219
 220                                         if(generate_keys < 512) {
 221                                                 fprintf(stderr, "Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n",
 222                                                                 optarg);
 223                                                 usage(true);
 224                                                 return false;
 225                                         }
 226
 227                                         generate_keys &= ~7;    /* Round it to bytes */
 228                                 } else
 229                                         generate_keys = 2048;
 230                                 break;
 231
 232                         case 'R':                               /* chroot to NETNAME dir */
 233                                 do_chroot = true;
 234                                 break;
 235
 236                         case 'U':                               /* setuid to USER */
 237                                 switchuser = optarg;
 238                                 break;
 239
 240                         case 1:                                 /* show help */
 241                                 show_help = true;
 242                                 break;
 243
 244                         case 2:                                 /* show version */
 245                                 show_version = true;
 246                                 break;
 247
 248                         case 3:                                 /* bypass security */
 249                                 bypass_security = true;
 250                                 break;
 251
 252                         case 4:                                 /* write log entries to a file */
 253                                 use_logfile = true;
 254                                 if(optarg)
 255                                         logfilename = xstrdup(optarg);
 256                                 break;
 257
 258                         case 5:                                 /* write PID to a file */
 259                                 pidfilename = xstrdup(optarg);
 260                                 break;
 261
 262                         case '?':
 263                                 usage(true);
 264                                 return false;
 265
 266                         default:
 267                                 break;
 268                 }
 269         }
 270
 271         return true;
 272 }
 273
 274 /* This function prettyprints the key generation process */
 275
 276 static void indicator(int a, int b, void *p) {
 277         switch (a) {
 278                 case 0:
 279                         fprintf(stderr, ".");
 280                         break;
 281
 282                 case 1:
 283                         fprintf(stderr, "+");
 284                         break;
 285
 286                 case 2:
 287                         fprintf(stderr, "-");
 288                         break;
 289
 290                 case 3:
 291                         switch (b) {
 292                                 case 0:
 293                                         fprintf(stderr, " p\n");
 294                                         break;
 295
 296                                 case 1:
 297                                         fprintf(stderr, " q\n");
 298                                         break;
 299
 300                                 default:
 301                                         fprintf(stderr, "?");
 302                         }
 303                         break;
 304
 305                 default:
 306                         fprintf(stderr, "?");
 307         }
 308 }
 309
 310 /*
 311   Generate a public/private RSA keypair, and ask for a file to store
 312   them in.
 313 */
 314 static bool keygen(int bits) {
 315         RSA *rsa_key;
 316         FILE *f;
 317         char *name = NULL;
 318         char *filename;
 319
 320         get_config_string(lookup_config(config_tree, "Name"), &name);
 321
 322         if(name && !check_id(name)) {
 323                 fprintf(stderr, "Invalid name for myself!\n");
 324                 return false;
 325         }
 326
 327         fprintf(stderr, "Generating %d bits keys:\n", bits);
 328         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 329
 330         if(!rsa_key) {
 331                 fprintf(stderr, "Error during key generation!\n");
 332                 return false;
 333         } else
 334                 fprintf(stderr, "Done.\n");
 335
 336         xasprintf(&filename, "%s/rsa_key.priv", confbase);
 337         f = ask_and_open(filename, "private RSA key");
 338
 339         if(!f)
 340                 return false;
 341
 342         if(disable_old_keys(f))
 343                 fprintf(stderr, "Warning: old key(s) found and disabled.\n");
 344
 345 #ifdef HAVE_FCHMOD
 346         /* Make it unreadable for others. */
 347         fchmod(fileno(f), 0600);
 348 #endif
 349
 350         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 351         fclose(f);
 352         free(filename);
 353
 354         if(name)
 355                 xasprintf(&filename, "%s/hosts/%s", confbase, name);
 356         else
 357                 xasprintf(&filename, "%s/rsa_key.pub", confbase);
 358
 359         f = ask_and_open(filename, "public RSA key");
 360
 361         if(!f)
 362                 return false;
 363
 364         if(disable_old_keys(f))
 365                 fprintf(stderr, "Warning: old key(s) found and disabled.\n");
 366
 367         PEM_write_RSAPublicKey(f, rsa_key);
 368         fclose(f);
 369         free(filename);
 370         if(name)
 371                 free(name);
 372
 373         return true;
 374 }
 375
 376 /*
 377   Set all files and paths according to netname
 378 */
 379 static void make_names(void) {
 380 #ifdef HAVE_MINGW
 381         HKEY key;
 382         char installdir[1024] = "";
 383         long len = sizeof(installdir);
 384 #endif
 385
 386         if(netname)
 387                 xasprintf(&identname, "tinc.%s", netname);
 388         else
 389                 identname = xstrdup("tinc");
 390
 391 #ifdef HAVE_MINGW
 392         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 393                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 394                         if(!logfilename)
 395                                 xasprintf(&logfilename, "%s/log/%s.log", identname);
 396                         if(!confbase) {
 397                                 if(netname)
 398                                         xasprintf(&confbase, "%s/%s", installdir, netname);
 399                                 else
 400                                         xasprintf(&confbase, "%s", installdir);
 401                         }
 402                 }
 403                 RegCloseKey(key);
 404                 if(*installdir)
 405                         return;
 406         }
 407 #endif
 408
 409         if(!pidfilename)
 410                 xasprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 411
 412         if(!logfilename)
 413                 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 414
 415         if(netname) {
 416                 if(!confbase)
 417                         xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
 418                 else
 419                         logger(LOG_INFO, "Both netname and configuration directory given, using the latter...");
 420         } else {
 421                 if(!confbase)
 422                         xasprintf(&confbase, CONFDIR "/tinc");
 423         }
 424 }
 425
 426 static void free_names() {
 427         if (identname) free(identname);
 428         if (netname) free(netname);
 429         if (pidfilename) free(pidfilename);
 430         if (logfilename) free(logfilename);
 431         if (confbase) free(confbase);
 432 }
 433
 434 static bool drop_privs() {
 435 #ifdef HAVE_MINGW
 436         if (switchuser) {
 437                 logger(LOG_ERR, "%s not supported on this platform", "-U");
 438                 return false;
 439         }
 440         if (do_chroot) {
 441                 logger(LOG_ERR, "%s not supported on this platform", "-R");
 442                 return false;
 443         }
 444 #else
 445         uid_t uid = 0;
 446         if (switchuser) {
 447                 struct passwd *pw = getpwnam(switchuser);
 448                 if (!pw) {
 449                         logger(LOG_ERR, "unknown user `%s'", switchuser);
 450                         return false;
 451                 }
 452                 uid = pw->pw_uid;
 453                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 454                     setgid(pw->pw_gid) != 0) {
 455                         logger(LOG_ERR, "System call `%s' failed: %s",
 456                                "initgroups", strerror(errno));
 457                         return false;
 458                 }
 459                 endgrent();
 460                 endpwent();
 461         }
 462         if (do_chroot) {
 463                 tzset();        /* for proper timestamps in logs */
 464                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 465                         logger(LOG_ERR, "System call `%s' failed: %s",
 466                                "chroot", strerror(errno));
 467                         return false;
 468                 }
 469                 free(confbase);
 470                 confbase = xstrdup("");
 471         }
 472         if (switchuser)
 473                 if (setuid(uid) != 0) {
 474                         logger(LOG_ERR, "System call `%s' failed: %s",
 475                                "setuid", strerror(errno));
 476                         return false;
 477                 }
 478 #endif
 479         return true;
 480 }
 481
 482 #ifdef HAVE_MINGW
 483 # define setpriority(level) SetPriorityClass(GetCurrentProcess(), level)
 484 #else
 485 # define NORMAL_PRIORITY_CLASS 0
 486 # define BELOW_NORMAL_PRIORITY_CLASS 10
 487 # define HIGH_PRIORITY_CLASS -10
 488 # define setpriority(level) nice(level)
 489 #endif
 490
 491 int main(int argc, char **argv) {
 492         program_name = argv[0];
 493
 494         if(!parse_options(argc, argv))
 495                 return 1;
 496
 497         make_names();
 498
 499         if(show_version) {
 500                 printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
 501                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 502                 printf("Copyright (C) 1998-2009 Ivo Timmermans, Guus Sliepen and others.\n"
 503                                 "See the AUTHORS file for a complete list.\n\n"
 504                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 505                                 "and you are welcome to redistribute it under certain conditions;\n"
 506                                 "see the file COPYING for details.\n");
 507
 508                 return 0;
 509         }
 510
 511         if(show_help) {
 512                 usage(false);
 513                 return 0;
 514         }
 515
 516         if(kill_tincd)
 517                 return !kill_other(kill_tincd);
 518
 519         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 520
 521         g_argv = argv;
 522
 523         init_configuration(&config_tree);
 524
 525         /* Slllluuuuuuurrrrp! */
 526
 527         RAND_load_file("/dev/urandom", 1024);
 528
 529         ENGINE_load_builtin_engines();
 530         ENGINE_register_all_complete();
 531
 532         OpenSSL_add_all_algorithms();
 533
 534         if(generate_keys) {
 535                 read_server_config();
 536                 return !keygen(generate_keys);
 537         }
 538
 539         if(!read_server_config())
 540                 return 1;
 541
 542         if(lzo_init() != LZO_E_OK) {
 543                 logger(LOG_ERR, "Error initializing LZO compressor!");
 544                 return 1;
 545         }
 546
 547 #ifdef HAVE_MINGW
 548         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 549                 logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 550                 return 1;
 551         }
 552
 553         if(!do_detach || !init_service())
 554                 return main2(argc, argv);
 555         else
 556                 return 1;
 557 }
 558
 559 int main2(int argc, char **argv) {
 560         InitializeCriticalSection(&mutex);
 561         EnterCriticalSection(&mutex);
 562 #endif
 563
 564         if(!detach())
 565                 return 1;
 566
 567 #ifdef HAVE_MLOCKALL
 568         /* Lock all pages into memory if requested.
 569          * This has to be done after daemon()/fork() so it works for child.
 570          * No need to do that in parent as it's very short-lived. */
 571         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 572                 logger(LOG_ERR, "System call `%s' failed: %s", "mlockall",
 573                    strerror(errno));
 574                 return 1;
 575         }
 576 #endif
 577
 578         /* Setup sockets and open device. */
 579
 580         if(!setup_network())
 581                 goto end;
 582
 583         /* Initiate all outgoing connections. */
 584
 585         try_outgoing_connections();
 586
 587         /* Change process priority */
 588
 589         char *priority = 0;
 590
 591         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 592                 if(!strcasecmp(priority, "Normal"))
 593                         setpriority(NORMAL_PRIORITY_CLASS);
 594                 else if(!strcasecmp(priority, "Low"))
 595                         setpriority(BELOW_NORMAL_PRIORITY_CLASS);
 596                 else if(!strcasecmp(priority, "High"))
 597                         setpriority(HIGH_PRIORITY_CLASS);
 598                 else {
 599                         logger(LOG_ERR, "Invalid priority `%s`!", priority);
 600                         goto end;
 601                 }
 602         }
 603
 604         /* drop privileges */
 605         if (!drop_privs())
 606                 goto end;
 607
 608         /* Start main loop. It only exits when tinc is killed. */
 609
 610         status = main_loop();
 611
 612         /* Shutdown properly. */
 613
 614         ifdebug(CONNECTIONS)
 615                 dump_device_stats();
 616
 617         close_network_connections();
 618
 619 end:
 620         logger(LOG_NOTICE, "Terminating");
 621
 622 #ifndef HAVE_MINGW
 623         remove_pid(pidfilename);
 624 #endif
 625
 626         EVP_cleanup();
 627         ENGINE_cleanup();
 628         CRYPTO_cleanup_all_ex_data();
 629         ERR_remove_state(0);
 630         ERR_free_strings();
 631
 632         exit_configuration(&config_tree);
 633         free_names();
 634
 635         return status;
 636 }