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