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                   2000-2010 Guus Sliepen <guus@tinc-vpn.org>
   5                   2008      Max Rijevski <maksuf@gmail.com>
   6                   2009      Michael Tokarev <mjt@tls.msk.ru>
   7                   2010      Julien Muchembled <jm@jmuchemb.eu>
   8                   2010      Timothy Redaelli <timothy@redaelli.eu>
   9
  10     This program is free software; you can redistribute it and/or modify
  11     it under the terms of the GNU General Public License as published by
  12     the Free Software Foundation; either version 2 of the License, or
  13     (at your option) any later version.
  14
  15     This program is distributed in the hope that it will be useful,
  16     but WITHOUT ANY WARRANTY; without even the implied warranty of
  17     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18     GNU General Public License for more details.
  19
  20     You should have received a copy of the GNU General Public License along
  21     with this program; if not, write to the Free Software Foundation, Inc.,
  22     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23 */
  24
  25 #include "system.h"
  26
  27 /* Darwin (MacOS/X) needs the following definition... */
  28 #ifndef _P1003_1B_VISIBLE
  29 #define _P1003_1B_VISIBLE
  30 #endif
  31
  32 #ifdef HAVE_SYS_MMAN_H
  33 #include <sys/mman.h>
  34 #endif
  35
  36 #include <openssl/rand.h>
  37 #include <openssl/rsa.h>
  38 #include <openssl/pem.h>
  39 #include <openssl/evp.h>
  40 #include <openssl/engine.h>
  41
  42 #ifdef HAVE_LZO
  43 #include LZO1X_H
  44 #endif
  45
  46 #ifndef HAVE_MINGW
  47 #include <pwd.h>
  48 #include <grp.h>
  49 #include <time.h>
  50 #endif
  51
  52 #include <getopt.h>
  53 #include "pidfile.h"
  54
  55 #include "conf.h"
  56 #include "device.h"
  57 #include "logger.h"
  58 #include "net.h"
  59 #include "netutl.h"
  60 #include "process.h"
  61 #include "protocol.h"
  62 #include "utils.h"
  63 #include "xalloc.h"
  64
  65 /* The name this program was run with. */
  66 char *program_name = NULL;
  67
  68 /* If nonzero, display usage information and exit. */
  69 bool show_help = false;
  70
  71 /* If nonzero, print the version on standard output and exit.  */
  72 bool show_version = false;
  73
  74 /* If nonzero, it will attempt to kill a running tincd and exit. */
  75 int kill_tincd = 0;
  76
  77 /* If nonzero, generate public/private keypair for this host/net. */
  78 int generate_keys = 0;
  79
  80 /* If nonzero, use null ciphers and skip all key exchanges. */
  81 bool bypass_security = false;
  82
  83 /* If nonzero, disable swapping for this process. */
  84 bool do_mlock = false;
  85
  86 /* If nonzero, chroot to netdir after startup. */
  87 static bool do_chroot = false;
  88
  89 /* If !NULL, do setuid to given user after startup */
  90 static const char *switchuser = NULL;
  91
  92 /* If nonzero, write log entries to a separate file. */
  93 bool use_logfile = false;
  94
  95 char *identname = NULL;                         /* program name for syslog */
  96 char *pidfilename = NULL;                       /* pid file location */
  97 char *logfilename = NULL;                       /* log file location */
  98 char **g_argv;                                  /* a copy of the cmdline arguments */
  99
 100 static int status;
 101
 102 static struct option const long_options[] = {
 103         {"config", required_argument, NULL, 'c'},
 104         {"kill", optional_argument, NULL, 'k'},
 105         {"net", required_argument, NULL, 'n'},
 106         {"help", no_argument, NULL, 1},
 107         {"version", no_argument, NULL, 2},
 108         {"no-detach", no_argument, NULL, 'D'},
 109         {"generate-keys", optional_argument, NULL, 'K'},
 110         {"debug", optional_argument, NULL, 'd'},
 111         {"bypass-security", no_argument, NULL, 3},
 112         {"mlock", no_argument, NULL, 'L'},
 113         {"chroot", no_argument, NULL, 'R'},
 114         {"user", required_argument, NULL, 'U'},
 115         {"logfile", optional_argument, NULL, 4},
 116         {"pidfile", required_argument, NULL, 5},
 117         {NULL, 0, NULL, 0}
 118 };
 119
 120 #ifdef HAVE_MINGW
 121 static struct WSAData wsa_state;
 122 CRITICAL_SECTION mutex;
 123 int main2(int argc, char **argv);
 124 #endif
 125
 126 static void usage(bool status) {
 127         if(status)
 128                 fprintf(stderr, "Try `%s --help\' for more information.\n",
 129                                 program_name);
 130         else {
 131                 printf("Usage: %s [option]...\n\n", program_name);
 132                 printf("  -c, --config=DIR           Read configuration options from DIR.\n"
 133                                 "  -D, --no-detach            Don't fork and detach.\n"
 134                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 135                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 136                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 137                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 138                                 "  -L, --mlock                Lock tinc into main memory.\n"
 139                                 "      --logfile[=FILENAME]   Write log entries to a logfile.\n"
 140                                 "      --pidfile=FILENAME     Write PID to FILENAME.\n"
 141                                 "  -o [HOST.]KEY=VALUE        Set global/host configuration value.\n"
 142                                 "  -R, --chroot               chroot to NET dir at startup.\n"
 143                                 "  -U, --user=USER            setuid to given USER at startup.\n"
 144                                 "      --help                 Display this help and exit.\n"
 145                                 "      --version              Output version information and exit.\n\n");
 146                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 147         }
 148 }
 149
 150 static bool parse_options(int argc, char **argv) {
 151         config_t *cfg;
 152         int r;
 153         int option_index = 0;
 154         int lineno = 0;
 155
 156         cmdline_conf = list_alloc((list_action_t)free_config);
 157
 158         while((r = getopt_long(argc, argv, "c:DLd::k::n:o:K::RU:", long_options, &option_index)) != EOF) {
 159                 switch (r) {
 160                         case 0:                         /* long option */
 161                                 break;
 162
 163                         case 'c':                               /* config file */
 164                                 confbase = xstrdup(optarg);
 165                                 break;
 166
 167                         case 'D':                               /* no detach */
 168                                 do_detach = false;
 169                                 break;
 170
 171                         case 'L':                               /* no detach */
 172 #ifndef HAVE_MLOCKALL
 173                                 logger(LOG_ERR, "%s not supported on this platform", "mlockall()");
 174                                 return false;
 175 #else
 176                                 do_mlock = true;
 177                                 break;
 178 #endif
 179
 180                         case 'd':                               /* inc debug level */
 181                                 if(optarg)
 182                                         debug_level = atoi(optarg);
 183                                 else
 184                                         debug_level++;
 185                                 break;
 186
 187                         case 'k':                               /* kill old tincds */
 188 #ifndef HAVE_MINGW
 189                                 if(optarg) {
 190                                         if(!strcasecmp(optarg, "HUP"))
 191                                                 kill_tincd = SIGHUP;
 192                                         else if(!strcasecmp(optarg, "TERM"))
 193                                                 kill_tincd = SIGTERM;
 194                                         else if(!strcasecmp(optarg, "KILL"))
 195                                                 kill_tincd = SIGKILL;
 196                                         else if(!strcasecmp(optarg, "USR1"))
 197                                                 kill_tincd = SIGUSR1;
 198                                         else if(!strcasecmp(optarg, "USR2"))
 199                                                 kill_tincd = SIGUSR2;
 200                                         else if(!strcasecmp(optarg, "WINCH"))
 201                                                 kill_tincd = SIGWINCH;
 202                                         else if(!strcasecmp(optarg, "INT"))
 203                                                 kill_tincd = SIGINT;
 204                                         else if(!strcasecmp(optarg, "ALRM"))
 205                                                 kill_tincd = SIGALRM;
 206                                         else {
 207                                                 kill_tincd = atoi(optarg);
 208
 209                                                 if(!kill_tincd) {
 210                                                         fprintf(stderr, "Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n",
 211                                                                         optarg);
 212                                                         usage(true);
 213                                                         return false;
 214                                                 }
 215                                         }
 216                                 } else
 217                                         kill_tincd = SIGTERM;
 218 #else
 219                                         kill_tincd = 1;
 220 #endif
 221                                 break;
 222
 223                         case 'n':                               /* net name given */
 224                                 /* netname "." is special: a "top-level name" */
 225                                 netname = strcmp(optarg, ".") != 0 ?
 226                                                 xstrdup(optarg) : NULL;
 227                                 break;
 228
 229                         case 'o':                               /* option */
 230                                 cfg = parse_config_line(optarg, NULL, ++lineno);
 231                                 if (!cfg)
 232                                         return false;
 233                                 list_insert_tail(cmdline_conf, cfg);
 234                                 break;
 235
 236                         case 'K':                               /* generate public/private keypair */
 237                                 if(optarg) {
 238                                         generate_keys = atoi(optarg);
 239
 240                                         if(generate_keys < 512) {
 241                                                 fprintf(stderr, "Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n",
 242                                                                 optarg);
 243                                                 usage(true);
 244                                                 return false;
 245                                         }
 246
 247                                         generate_keys &= ~7;    /* Round it to bytes */
 248                                 } else
 249                                         generate_keys = 2048;
 250                                 break;
 251
 252                         case 'R':                               /* chroot to NETNAME dir */
 253                                 do_chroot = true;
 254                                 break;
 255
 256                         case 'U':                               /* setuid to USER */
 257                                 switchuser = optarg;
 258                                 break;
 259
 260                         case 1:                                 /* show help */
 261                                 show_help = true;
 262                                 break;
 263
 264                         case 2:                                 /* show version */
 265                                 show_version = true;
 266                                 break;
 267
 268                         case 3:                                 /* bypass security */
 269                                 bypass_security = true;
 270                                 break;
 271
 272                         case 4:                                 /* write log entries to a file */
 273                                 use_logfile = true;
 274                                 if(optarg)
 275                                         logfilename = xstrdup(optarg);
 276                                 break;
 277
 278                         case 5:                                 /* write PID to a file */
 279                                 pidfilename = xstrdup(optarg);
 280                                 break;
 281
 282                         case '?':
 283                                 usage(true);
 284                                 return false;
 285
 286                         default:
 287                                 break;
 288                 }
 289         }
 290
 291         return true;
 292 }
 293
 294 /* This function prettyprints the key generation process */
 295
 296 static void indicator(int a, int b, void *p) {
 297         switch (a) {
 298                 case 0:
 299                         fprintf(stderr, ".");
 300                         break;
 301
 302                 case 1:
 303                         fprintf(stderr, "+");
 304                         break;
 305
 306                 case 2:
 307                         fprintf(stderr, "-");
 308                         break;
 309
 310                 case 3:
 311                         switch (b) {
 312                                 case 0:
 313                                         fprintf(stderr, " p\n");
 314                                         break;
 315
 316                                 case 1:
 317                                         fprintf(stderr, " q\n");
 318                                         break;
 319
 320                                 default:
 321                                         fprintf(stderr, "?");
 322                         }
 323                         break;
 324
 325                 default:
 326                         fprintf(stderr, "?");
 327         }
 328 }
 329
 330 /*
 331   Generate a public/private RSA keypair, and ask for a file to store
 332   them in.
 333 */
 334 static bool keygen(int bits) {
 335         RSA *rsa_key;
 336         FILE *f;
 337         char *name = NULL;
 338         char *filename;
 339
 340         get_config_string(lookup_config(config_tree, "Name"), &name);
 341
 342         if(name && !check_id(name)) {
 343                 fprintf(stderr, "Invalid name for myself!\n");
 344                 return false;
 345         }
 346
 347         fprintf(stderr, "Generating %d bits keys:\n", bits);
 348         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 349
 350         if(!rsa_key) {
 351                 fprintf(stderr, "Error during key generation!\n");
 352                 return false;
 353         } else
 354                 fprintf(stderr, "Done.\n");
 355
 356         xasprintf(&filename, "%s/rsa_key.priv", confbase);
 357         f = ask_and_open(filename, "private RSA key");
 358
 359         if(!f)
 360                 return false;
 361
 362         if(disable_old_keys(f))
 363                 fprintf(stderr, "Warning: old key(s) found and disabled.\n");
 364
 365 #ifdef HAVE_FCHMOD
 366         /* Make it unreadable for others. */
 367         fchmod(fileno(f), 0600);
 368 #endif
 369
 370         fputc('\n', f);
 371         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 372         fclose(f);
 373         free(filename);
 374
 375         if(name)
 376                 xasprintf(&filename, "%s/hosts/%s", confbase, name);
 377         else
 378                 xasprintf(&filename, "%s/rsa_key.pub", confbase);
 379
 380         f = ask_and_open(filename, "public RSA key");
 381
 382         if(!f)
 383                 return false;
 384
 385         if(disable_old_keys(f))
 386                 fprintf(stderr, "Warning: old key(s) found and disabled.\n");
 387
 388         fputc('\n', f);
 389         PEM_write_RSAPublicKey(f, rsa_key);
 390         fclose(f);
 391         free(filename);
 392         if(name)
 393                 free(name);
 394
 395         return true;
 396 }
 397
 398 /*
 399   Set all files and paths according to netname
 400 */
 401 static void make_names(void) {
 402 #ifdef HAVE_MINGW
 403         HKEY key;
 404         char installdir[1024] = "";
 405         long len = sizeof(installdir);
 406 #endif
 407
 408         if(netname)
 409                 xasprintf(&identname, "tinc.%s", netname);
 410         else
 411                 identname = xstrdup("tinc");
 412
 413 #ifdef HAVE_MINGW
 414         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 415                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 416                         if(!logfilename)
 417                                 xasprintf(&logfilename, "%s/log/%s.log", identname);
 418                         if(!confbase) {
 419                                 if(netname)
 420                                         xasprintf(&confbase, "%s/%s", installdir, netname);
 421                                 else
 422                                         xasprintf(&confbase, "%s", installdir);
 423                         }
 424                 }
 425                 RegCloseKey(key);
 426                 if(*installdir)
 427                         return;
 428         }
 429 #endif
 430
 431         if(!pidfilename)
 432                 xasprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 433
 434         if(!logfilename)
 435                 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 436
 437         if(netname) {
 438                 if(!confbase)
 439                         xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
 440                 else
 441                         logger(LOG_INFO, "Both netname and configuration directory given, using the latter...");
 442         } else {
 443                 if(!confbase)
 444                         xasprintf(&confbase, CONFDIR "/tinc");
 445         }
 446 }
 447
 448 static void free_names() {
 449         if (identname) free(identname);
 450         if (netname) free(netname);
 451         if (pidfilename) free(pidfilename);
 452         if (logfilename) free(logfilename);
 453         if (confbase) free(confbase);
 454 }
 455
 456 static bool drop_privs() {
 457 #ifdef HAVE_MINGW
 458         if (switchuser) {
 459                 logger(LOG_ERR, "%s not supported on this platform", "-U");
 460                 return false;
 461         }
 462         if (do_chroot) {
 463                 logger(LOG_ERR, "%s not supported on this platform", "-R");
 464                 return false;
 465         }
 466 #else
 467         uid_t uid = 0;
 468         if (switchuser) {
 469                 struct passwd *pw = getpwnam(switchuser);
 470                 if (!pw) {
 471                         logger(LOG_ERR, "unknown user `%s'", switchuser);
 472                         return false;
 473                 }
 474                 uid = pw->pw_uid;
 475                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 476                     setgid(pw->pw_gid) != 0) {
 477                         logger(LOG_ERR, "System call `%s' failed: %s",
 478                                "initgroups", strerror(errno));
 479                         return false;
 480                 }
 481                 endgrent();
 482                 endpwent();
 483         }
 484         if (do_chroot) {
 485                 tzset();        /* for proper timestamps in logs */
 486                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 487                         logger(LOG_ERR, "System call `%s' failed: %s",
 488                                "chroot", strerror(errno));
 489                         return false;
 490                 }
 491                 free(confbase);
 492                 confbase = xstrdup("");
 493         }
 494         if (switchuser)
 495                 if (setuid(uid) != 0) {
 496                         logger(LOG_ERR, "System call `%s' failed: %s",
 497                                "setuid", strerror(errno));
 498                         return false;
 499                 }
 500 #endif
 501         return true;
 502 }
 503
 504 #ifdef HAVE_MINGW
 505 # define setpriority(level) SetPriorityClass(GetCurrentProcess(), level)
 506 #else
 507 # define NORMAL_PRIORITY_CLASS 0
 508 # define BELOW_NORMAL_PRIORITY_CLASS 10
 509 # define HIGH_PRIORITY_CLASS -10
 510 # define setpriority(level) nice(level)
 511 #endif
 512
 513 int main(int argc, char **argv) {
 514         program_name = argv[0];
 515
 516         if(!parse_options(argc, argv))
 517                 return 1;
 518
 519         make_names();
 520
 521         if(show_version) {
 522                 printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
 523                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 524                 printf("Copyright (C) 1998-2010 Ivo Timmermans, Guus Sliepen and others.\n"
 525                                 "See the AUTHORS file for a complete list.\n\n"
 526                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 527                                 "and you are welcome to redistribute it under certain conditions;\n"
 528                                 "see the file COPYING for details.\n");
 529
 530                 return 0;
 531         }
 532
 533         if(show_help) {
 534                 usage(false);
 535                 return 0;
 536         }
 537
 538         if(kill_tincd)
 539                 return !kill_other(kill_tincd);
 540
 541         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 542
 543         g_argv = argv;
 544
 545         init_configuration(&config_tree);
 546
 547         /* Slllluuuuuuurrrrp! */
 548
 549         RAND_load_file("/dev/urandom", 1024);
 550
 551         ENGINE_load_builtin_engines();
 552         ENGINE_register_all_complete();
 553
 554         OpenSSL_add_all_algorithms();
 555
 556         if(generate_keys) {
 557                 read_server_config();
 558                 return !keygen(generate_keys);
 559         }
 560
 561         if(!read_server_config())
 562                 return 1;
 563
 564 #ifdef HAVE_LZO
 565         if(lzo_init() != LZO_E_OK) {
 566                 logger(LOG_ERR, "Error initializing LZO compressor!");
 567                 return 1;
 568         }
 569 #endif
 570
 571 #ifdef HAVE_MINGW
 572         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 573                 logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 574                 return 1;
 575         }
 576
 577         if(!do_detach || !init_service())
 578                 return main2(argc, argv);
 579         else
 580                 return 1;
 581 }
 582
 583 int main2(int argc, char **argv) {
 584         InitializeCriticalSection(&mutex);
 585         EnterCriticalSection(&mutex);
 586 #endif
 587
 588         if(!detach())
 589                 return 1;
 590
 591 #ifdef HAVE_MLOCKALL
 592         /* Lock all pages into memory if requested.
 593          * This has to be done after daemon()/fork() so it works for child.
 594          * No need to do that in parent as it's very short-lived. */
 595         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 596                 logger(LOG_ERR, "System call `%s' failed: %s", "mlockall",
 597                    strerror(errno));
 598                 return 1;
 599         }
 600 #endif
 601
 602         /* Setup sockets and open device. */
 603
 604         if(!setup_network())
 605                 goto end;
 606
 607         /* Initiate all outgoing connections. */
 608
 609         try_outgoing_connections();
 610
 611         /* Change process priority */
 612
 613         char *priority = 0;
 614
 615         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 616                 if(!strcasecmp(priority, "Normal")) {
 617                         if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
 618                                 logger(LOG_ERR, "System call `%s' failed: %s",
 619                                        "setpriority", strerror(errno));
 620                                 goto end;
 621                         }
 622                 } else if(!strcasecmp(priority, "Low")) {
 623                         if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
 624                                        logger(LOG_ERR, "System call `%s' failed: %s",
 625                                        "setpriority", strerror(errno));
 626                                 goto end;
 627                         }
 628                 } else if(!strcasecmp(priority, "High")) {
 629                         if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
 630                                 logger(LOG_ERR, "System call `%s' failed: %s",
 631                                        "setpriority", strerror(errno));
 632                                 goto end;
 633                         }
 634                 } else {
 635                         logger(LOG_ERR, "Invalid priority `%s`!", priority);
 636                         goto end;
 637                 }
 638         }
 639
 640         /* drop privileges */
 641         if (!drop_privs())
 642                 goto end;
 643
 644         /* Start main loop. It only exits when tinc is killed. */
 645
 646         status = main_loop();
 647
 648         /* Shutdown properly. */
 649
 650         ifdebug(CONNECTIONS)
 651                 dump_device_stats();
 652
 653         close_network_connections();
 654
 655 end:
 656         logger(LOG_NOTICE, "Terminating");
 657
 658 #ifndef HAVE_MINGW
 659         remove_pid(pidfilename);
 660 #endif
 661
 662         EVP_cleanup();
 663         ENGINE_cleanup();
 664         CRYPTO_cleanup_all_ex_data();
 665         ERR_remove_state(0);
 666         ERR_free_strings();
 667
 668         exit_configuration(&config_tree);
 669         free_names();
 670
 671         return status;
 672 }