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 = xstrdup(optarg);
 225                                 break;
 226
 227                         case 'o':                               /* option */
 228                                 cfg = parse_config_line(optarg, NULL, ++lineno);
 229                                 if (!cfg)
 230                                         return false;
 231                                 list_insert_tail(cmdline_conf, cfg);
 232                                 break;
 233
 234                         case 'K':                               /* generate public/private keypair */
 235                                 if(optarg) {
 236                                         generate_keys = atoi(optarg);
 237
 238                                         if(generate_keys < 512) {
 239                                                 fprintf(stderr, "Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n",
 240                                                                 optarg);
 241                                                 usage(true);
 242                                                 return false;
 243                                         }
 244
 245                                         generate_keys &= ~7;    /* Round it to bytes */
 246                                 } else
 247                                         generate_keys = 2048;
 248                                 break;
 249
 250                         case 'R':                               /* chroot to NETNAME dir */
 251                                 do_chroot = true;
 252                                 break;
 253
 254                         case 'U':                               /* setuid to USER */
 255                                 switchuser = optarg;
 256                                 break;
 257
 258                         case 1:                                 /* show help */
 259                                 show_help = true;
 260                                 break;
 261
 262                         case 2:                                 /* show version */
 263                                 show_version = true;
 264                                 break;
 265
 266                         case 3:                                 /* bypass security */
 267                                 bypass_security = true;
 268                                 break;
 269
 270                         case 4:                                 /* write log entries to a file */
 271                                 use_logfile = true;
 272                                 if(optarg)
 273                                         logfilename = xstrdup(optarg);
 274                                 break;
 275
 276                         case 5:                                 /* write PID to a file */
 277                                 pidfilename = xstrdup(optarg);
 278                                 break;
 279
 280                         case '?':
 281                                 usage(true);
 282                                 return false;
 283
 284                         default:
 285                                 break;
 286                 }
 287         }
 288
 289         return true;
 290 }
 291
 292 /* This function prettyprints the key generation process */
 293
 294 static void indicator(int a, int b, void *p) {
 295         switch (a) {
 296                 case 0:
 297                         fprintf(stderr, ".");
 298                         break;
 299
 300                 case 1:
 301                         fprintf(stderr, "+");
 302                         break;
 303
 304                 case 2:
 305                         fprintf(stderr, "-");
 306                         break;
 307
 308                 case 3:
 309                         switch (b) {
 310                                 case 0:
 311                                         fprintf(stderr, " p\n");
 312                                         break;
 313
 314                                 case 1:
 315                                         fprintf(stderr, " q\n");
 316                                         break;
 317
 318                                 default:
 319                                         fprintf(stderr, "?");
 320                         }
 321                         break;
 322
 323                 default:
 324                         fprintf(stderr, "?");
 325         }
 326 }
 327
 328 /*
 329   Generate a public/private RSA keypair, and ask for a file to store
 330   them in.
 331 */
 332 static bool keygen(int bits) {
 333         RSA *rsa_key;
 334         FILE *f;
 335         char *name = NULL;
 336         char *filename;
 337
 338         get_config_string(lookup_config(config_tree, "Name"), &name);
 339
 340         if(name && !check_id(name)) {
 341                 fprintf(stderr, "Invalid name for myself!\n");
 342                 return false;
 343         }
 344
 345         fprintf(stderr, "Generating %d bits keys:\n", bits);
 346         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 347
 348         if(!rsa_key) {
 349                 fprintf(stderr, "Error during key generation!\n");
 350                 return false;
 351         } else
 352                 fprintf(stderr, "Done.\n");
 353
 354         xasprintf(&filename, "%s/rsa_key.priv", confbase);
 355         f = ask_and_open(filename, "private RSA key");
 356
 357         if(!f)
 358                 return false;
 359
 360         if(disable_old_keys(f))
 361                 fprintf(stderr, "Warning: old key(s) found and disabled.\n");
 362
 363 #ifdef HAVE_FCHMOD
 364         /* Make it unreadable for others. */
 365         fchmod(fileno(f), 0600);
 366 #endif
 367
 368         fputc('\n', f);
 369         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 370         fclose(f);
 371         free(filename);
 372
 373         if(name)
 374                 xasprintf(&filename, "%s/hosts/%s", confbase, name);
 375         else
 376                 xasprintf(&filename, "%s/rsa_key.pub", confbase);
 377
 378         f = ask_and_open(filename, "public RSA key");
 379
 380         if(!f)
 381                 return false;
 382
 383         if(disable_old_keys(f))
 384                 fprintf(stderr, "Warning: old key(s) found and disabled.\n");
 385
 386         fputc('\n', f);
 387         PEM_write_RSAPublicKey(f, rsa_key);
 388         fclose(f);
 389         free(filename);
 390         if(name)
 391                 free(name);
 392
 393         return true;
 394 }
 395
 396 /*
 397   Set all files and paths according to netname
 398 */
 399 static void make_names(void) {
 400 #ifdef HAVE_MINGW
 401         HKEY key;
 402         char installdir[1024] = "";
 403         long len = sizeof(installdir);
 404 #endif
 405
 406         if(netname)
 407                 xasprintf(&identname, "tinc.%s", netname);
 408         else
 409                 identname = xstrdup("tinc");
 410
 411 #ifdef HAVE_MINGW
 412         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 413                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 414                         if(!logfilename)
 415                                 xasprintf(&logfilename, "%s/log/%s.log", identname);
 416                         if(!confbase) {
 417                                 if(netname)
 418                                         xasprintf(&confbase, "%s/%s", installdir, netname);
 419                                 else
 420                                         xasprintf(&confbase, "%s", installdir);
 421                         }
 422                 }
 423                 RegCloseKey(key);
 424                 if(*installdir)
 425                         return;
 426         }
 427 #endif
 428
 429         if(!pidfilename)
 430                 xasprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 431
 432         if(!logfilename)
 433                 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 434
 435         if(netname) {
 436                 if(!confbase)
 437                         xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
 438                 else
 439                         logger(LOG_INFO, "Both netname and configuration directory given, using the latter...");
 440         } else {
 441                 if(!confbase)
 442                         xasprintf(&confbase, CONFDIR "/tinc");
 443         }
 444 }
 445
 446 static void free_names() {
 447         if (identname) free(identname);
 448         if (netname) free(netname);
 449         if (pidfilename) free(pidfilename);
 450         if (logfilename) free(logfilename);
 451         if (confbase) free(confbase);
 452 }
 453
 454 static bool drop_privs() {
 455 #ifdef HAVE_MINGW
 456         if (switchuser) {
 457                 logger(LOG_ERR, "%s not supported on this platform", "-U");
 458                 return false;
 459         }
 460         if (do_chroot) {
 461                 logger(LOG_ERR, "%s not supported on this platform", "-R");
 462                 return false;
 463         }
 464 #else
 465         uid_t uid = 0;
 466         if (switchuser) {
 467                 struct passwd *pw = getpwnam(switchuser);
 468                 if (!pw) {
 469                         logger(LOG_ERR, "unknown user `%s'", switchuser);
 470                         return false;
 471                 }
 472                 uid = pw->pw_uid;
 473                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 474                     setgid(pw->pw_gid) != 0) {
 475                         logger(LOG_ERR, "System call `%s' failed: %s",
 476                                "initgroups", strerror(errno));
 477                         return false;
 478                 }
 479                 endgrent();
 480                 endpwent();
 481         }
 482         if (do_chroot) {
 483                 tzset();        /* for proper timestamps in logs */
 484                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 485                         logger(LOG_ERR, "System call `%s' failed: %s",
 486                                "chroot", strerror(errno));
 487                         return false;
 488                 }
 489                 free(confbase);
 490                 confbase = xstrdup("");
 491         }
 492         if (switchuser)
 493                 if (setuid(uid) != 0) {
 494                         logger(LOG_ERR, "System call `%s' failed: %s",
 495                                "setuid", strerror(errno));
 496                         return false;
 497                 }
 498 #endif
 499         return true;
 500 }
 501
 502 #ifdef HAVE_MINGW
 503 # define setpriority(level) SetPriorityClass(GetCurrentProcess(), level)
 504 #else
 505 # define NORMAL_PRIORITY_CLASS 0
 506 # define BELOW_NORMAL_PRIORITY_CLASS 10
 507 # define HIGH_PRIORITY_CLASS -10
 508 # define setpriority(level) nice(level)
 509 #endif
 510
 511 int main(int argc, char **argv) {
 512         program_name = argv[0];
 513
 514         if(!parse_options(argc, argv))
 515                 return 1;
 516
 517         make_names();
 518
 519         if(show_version) {
 520                 printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
 521                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 522                 printf("Copyright (C) 1998-2010 Ivo Timmermans, Guus Sliepen and others.\n"
 523                                 "See the AUTHORS file for a complete list.\n\n"
 524                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 525                                 "and you are welcome to redistribute it under certain conditions;\n"
 526                                 "see the file COPYING for details.\n");
 527
 528                 return 0;
 529         }
 530
 531         if(show_help) {
 532                 usage(false);
 533                 return 0;
 534         }
 535
 536         if(kill_tincd)
 537                 return !kill_other(kill_tincd);
 538
 539         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 540
 541         g_argv = argv;
 542
 543         init_configuration(&config_tree);
 544
 545         /* Slllluuuuuuurrrrp! */
 546
 547         RAND_load_file("/dev/urandom", 1024);
 548
 549         ENGINE_load_builtin_engines();
 550         ENGINE_register_all_complete();
 551
 552         OpenSSL_add_all_algorithms();
 553
 554         if(generate_keys) {
 555                 read_server_config();
 556                 return !keygen(generate_keys);
 557         }
 558
 559         if(!read_server_config())
 560                 return 1;
 561
 562 #ifdef HAVE_LZO
 563         if(lzo_init() != LZO_E_OK) {
 564                 logger(LOG_ERR, "Error initializing LZO compressor!");
 565                 return 1;
 566         }
 567 #endif
 568
 569 #ifdef HAVE_MINGW
 570         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 571                 logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 572                 return 1;
 573         }
 574
 575         if(!do_detach || !init_service())
 576                 return main2(argc, argv);
 577         else
 578                 return 1;
 579 }
 580
 581 int main2(int argc, char **argv) {
 582         InitializeCriticalSection(&mutex);
 583         EnterCriticalSection(&mutex);
 584 #endif
 585
 586         if(!detach())
 587                 return 1;
 588
 589 #ifdef HAVE_MLOCKALL
 590         /* Lock all pages into memory if requested.
 591          * This has to be done after daemon()/fork() so it works for child.
 592          * No need to do that in parent as it's very short-lived. */
 593         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 594                 logger(LOG_ERR, "System call `%s' failed: %s", "mlockall",
 595                    strerror(errno));
 596                 return 1;
 597         }
 598 #endif
 599
 600         /* Setup sockets and open device. */
 601
 602         if(!setup_network())
 603                 goto end;
 604
 605         /* Initiate all outgoing connections. */
 606
 607         try_outgoing_connections();
 608
 609         /* Change process priority */
 610
 611         char *priority = 0;
 612
 613         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 614                 if(!strcasecmp(priority, "Normal")) {
 615                         if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
 616                                 logger(LOG_ERR, "System call `%s' failed: %s",
 617                                        "setpriority", strerror(errno));
 618                                 goto end;
 619                         }
 620                 } else if(!strcasecmp(priority, "Low")) {
 621                         if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
 622                                        logger(LOG_ERR, "System call `%s' failed: %s",
 623                                        "setpriority", strerror(errno));
 624                                 goto end;
 625                         }
 626                 } else if(!strcasecmp(priority, "High")) {
 627                         if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
 628                                 logger(LOG_ERR, "System call `%s' failed: %s",
 629                                        "setpriority", strerror(errno));
 630                                 goto end;
 631                         }
 632                 } else {
 633                         logger(LOG_ERR, "Invalid priority `%s`!", priority);
 634                         goto end;
 635                 }
 636         }
 637
 638         /* drop privileges */
 639         if (!drop_privs())
 640                 goto end;
 641
 642         /* Start main loop. It only exits when tinc is killed. */
 643
 644         status = main_loop();
 645
 646         /* Shutdown properly. */
 647
 648         ifdebug(CONNECTIONS)
 649                 dump_device_stats();
 650
 651         close_network_connections();
 652
 653 end:
 654         logger(LOG_NOTICE, "Terminating");
 655
 656 #ifndef HAVE_MINGW
 657         remove_pid(pidfilename);
 658 #endif
 659
 660         EVP_cleanup();
 661         ENGINE_cleanup();
 662         CRYPTO_cleanup_all_ex_data();
 663         ERR_remove_state(0);
 664         ERR_free_strings();
 665
 666         exit_configuration(&config_tree);
 667         free_names();
 668
 669         return status;
 670 }