src/tincd.c

   1 /*
   2     tincd.c -- the main file for tincd
   3     Copyright (C) 1998-2005 Ivo Timmermans
   4                   2000-2009 Guus Sliepen <guus@tinc-vpn.org>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20     $Id$
  21 */
  22
  23 #include "system.h"
  24
  25 /* Darwin (MacOS/X) needs the following definition... */
  26 #ifndef _P1003_1B_VISIBLE
  27 #define _P1003_1B_VISIBLE
  28 #endif
  29
  30 #ifdef HAVE_SYS_MMAN_H
  31 #include <sys/mman.h>
  32 #endif
  33
  34 #include <openssl/rand.h>
  35 #include <openssl/rsa.h>
  36 #include <openssl/pem.h>
  37 #include <openssl/evp.h>
  38 #include <openssl/engine.h>
  39
  40 #include LZO1X_H
  41
  42 #ifndef HAVE_MINGW
  43 #include <pwd.h>
  44 #include <grp.h>
  45 #include <time.h>
  46 #endif
  47
  48 #include <getopt.h>
  49 #include "pidfile.h"
  50
  51 #include "conf.h"
  52 #include "device.h"
  53 #include "logger.h"
  54 #include "net.h"
  55 #include "netutl.h"
  56 #include "process.h"
  57 #include "protocol.h"
  58 #include "utils.h"
  59 #include "xalloc.h"
  60
  61 /* The name this program was run with. */
  62 char *program_name = NULL;
  63
  64 /* If nonzero, display usage information and exit. */
  65 bool show_help = false;
  66
  67 /* If nonzero, print the version on standard output and exit.  */
  68 bool show_version = false;
  69
  70 /* If nonzero, it will attempt to kill a running tincd and exit. */
  71 int kill_tincd = 0;
  72
  73 /* If nonzero, generate public/private keypair for this host/net. */
  74 int generate_keys = 0;
  75
  76 /* If nonzero, use null ciphers and skip all key exchanges. */
  77 bool bypass_security = false;
  78
  79 /* If nonzero, disable swapping for this process. */
  80 bool do_mlock = false;
  81
  82 /* If nonzero, chroot to netdir after startup. */
  83 static bool do_chroot = false;
  84
  85 /* If !NULL, do setuid to given user after startup */
  86 static const char *switchuser = NULL;
  87
  88 /* If nonzero, write log entries to a separate file. */
  89 bool use_logfile = false;
  90
  91 char *identname = NULL;                         /* program name for syslog */
  92 char *pidfilename = NULL;                       /* pid file location */
  93 char *logfilename = NULL;                       /* log file location */
  94 char **g_argv;                                  /* a copy of the cmdline arguments */
  95
  96 static int status;
  97
  98 static struct option const long_options[] = {
  99         {"config", required_argument, NULL, 'c'},
 100         {"kill", optional_argument, NULL, 'k'},
 101         {"net", required_argument, NULL, 'n'},
 102         {"help", no_argument, NULL, 1},
 103         {"version", no_argument, NULL, 2},
 104         {"no-detach", no_argument, NULL, 'D'},
 105         {"generate-keys", optional_argument, NULL, 'K'},
 106         {"debug", optional_argument, NULL, 'd'},
 107         {"bypass-security", no_argument, NULL, 3},
 108         {"mlock", no_argument, NULL, 'L'},
 109         {"chroot", no_argument, NULL, 'R'},
 110         {"user", required_argument, NULL, 'U'},
 111         {"logfile", optional_argument, NULL, 4},
 112         {"pidfile", required_argument, NULL, 5},
 113         {NULL, 0, NULL, 0}
 114 };
 115
 116 #ifdef HAVE_MINGW
 117 static struct WSAData wsa_state;
 118 #endif
 119
 120 static void usage(bool status)
 121 {
 122         if(status)
 123                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
 124                                 program_name);
 125         else {
 126                 printf(_("Usage: %s [option]...\n\n"), program_name);
 127                 printf(_("  -c, --config=DIR           Read configuration options from DIR.\n"
 128                                 "  -D, --no-detach            Don't fork and detach.\n"
 129                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 130                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 131                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 132                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 133                                 "  -L, --mlock                Lock tinc into main memory.\n"
 134                                 "      --logfile[=FILENAME]   Write log entries to a logfile.\n"
 135                                 "      --pidfile=FILENAME     Write PID to FILENAME.\n"
 136                                 "  -R, --chroot               chroot to NET dir at startup.\n"
 137                                 "  -U, --user=USER            setuid to given USER at startup.\n"
 138                                 "      --help                 Display this help and exit.\n"
 139                                 "      --version              Output version information and exit.\n\n"));
 140                 printf(_("Report bugs to tinc@tinc-vpn.org.\n"));
 141         }
 142 }
 143
 144 static bool parse_options(int argc, char **argv)
 145 {
 146         int r;
 147         int option_index = 0;
 148
 149         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::RU:", long_options, &option_index)) != EOF) {
 150                 switch (r) {
 151                         case 0:                         /* long option */
 152                                 break;
 153
 154                         case 'c':                               /* config file */
 155                                 confbase = xstrdup(optarg);
 156                                 break;
 157
 158                         case 'D':                               /* no detach */
 159                                 do_detach = false;
 160                                 break;
 161
 162                         case 'L':                               /* no detach */
 163                                 do_mlock = true;
 164                                 break;
 165
 166                         case 'd':                               /* inc debug level */
 167                                 if(optarg)
 168                                         debug_level = atoi(optarg);
 169                                 else
 170                                         debug_level++;
 171                                 break;
 172
 173                         case 'k':                               /* kill old tincds */
 174 #ifndef HAVE_MINGW
 175                                 if(optarg) {
 176                                         if(!strcasecmp(optarg, "HUP"))
 177                                                 kill_tincd = SIGHUP;
 178                                         else if(!strcasecmp(optarg, "TERM"))
 179                                                 kill_tincd = SIGTERM;
 180                                         else if(!strcasecmp(optarg, "KILL"))
 181                                                 kill_tincd = SIGKILL;
 182                                         else if(!strcasecmp(optarg, "USR1"))
 183                                                 kill_tincd = SIGUSR1;
 184                                         else if(!strcasecmp(optarg, "USR2"))
 185                                                 kill_tincd = SIGUSR2;
 186                                         else if(!strcasecmp(optarg, "WINCH"))
 187                                                 kill_tincd = SIGWINCH;
 188                                         else if(!strcasecmp(optarg, "INT"))
 189                                                 kill_tincd = SIGINT;
 190                                         else if(!strcasecmp(optarg, "ALRM"))
 191                                                 kill_tincd = SIGALRM;
 192                                         else {
 193                                                 kill_tincd = atoi(optarg);
 194
 195                                                 if(!kill_tincd) {
 196                                                         fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
 197                                                                         optarg);
 198                                                         usage(true);
 199                                                         return false;
 200                                                 }
 201                                         }
 202                                 } else
 203                                         kill_tincd = SIGTERM;
 204 #else
 205                                         kill_tincd = 1;
 206 #endif
 207                                 break;
 208
 209                         case 'n':                               /* net name given */
 210                                 netname = xstrdup(optarg);
 211                                 break;
 212
 213                         case 'K':                               /* generate public/private keypair */
 214                                 if(optarg) {
 215                                         generate_keys = atoi(optarg);
 216
 217                                         if(generate_keys < 512) {
 218                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 219                                                                 optarg);
 220                                                 usage(true);
 221                                                 return false;
 222                                         }
 223
 224                                         generate_keys &= ~7;    /* Round it to bytes */
 225                                 } else
 226                                         generate_keys = 1024;
 227                                 break;
 228
 229                         case 'R':                               /* chroot to NETNAME dir */
 230                                 do_chroot = true;
 231                                 break;
 232
 233                         case 'U':                               /* setuid to USER */
 234                                 switchuser = optarg;
 235                                 break;
 236
 237                         case 1:                                 /* show help */
 238                                 show_help = true;
 239                                 break;
 240
 241                         case 2:                                 /* show version */
 242                                 show_version = true;
 243                                 break;
 244
 245                         case 3:                                 /* bypass security */
 246                                 bypass_security = true;
 247                                 break;
 248
 249                         case 4:                                 /* write log entries to a file */
 250                                 use_logfile = true;
 251                                 if(optarg)
 252                                         logfilename = xstrdup(optarg);
 253                                 break;
 254
 255                         case 5:                                 /* write PID to a file */
 256                                 pidfilename = xstrdup(optarg);
 257                                 break;
 258
 259                         case '?':
 260                                 usage(true);
 261                                 return false;
 262
 263                         default:
 264                                 break;
 265                 }
 266         }
 267
 268         return true;
 269 }
 270
 271 /* This function prettyprints the key generation process */
 272
 273 static void indicator(int a, int b, void *p)
 274 {
 275         switch (a) {
 276                 case 0:
 277                         fprintf(stderr, ".");
 278                         break;
 279
 280                 case 1:
 281                         fprintf(stderr, "+");
 282                         break;
 283
 284                 case 2:
 285                         fprintf(stderr, "-");
 286                         break;
 287
 288                 case 3:
 289                         switch (b) {
 290                                 case 0:
 291                                         fprintf(stderr, " p\n");
 292                                         break;
 293
 294                                 case 1:
 295                                         fprintf(stderr, " q\n");
 296                                         break;
 297
 298                                 default:
 299                                         fprintf(stderr, "?");
 300                         }
 301                         break;
 302
 303                 default:
 304                         fprintf(stderr, "?");
 305         }
 306 }
 307
 308 /*
 309   Generate a public/private RSA keypair, and ask for a file to store
 310   them in.
 311 */
 312 static bool keygen(int bits)
 313 {
 314         RSA *rsa_key;
 315         FILE *f;
 316         char *name = NULL;
 317         char *filename;
 318
 319         get_config_string(lookup_config(config_tree, "Name"), &name);
 320
 321         if(name && !check_id(name)) {
 322                 fprintf(stderr, _("Invalid name for myself!\n"));
 323                 return false;
 324         }
 325
 326         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 327         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 328
 329         if(!rsa_key) {
 330                 fprintf(stderr, _("Error during key generation!\n"));
 331                 return false;
 332         } else
 333                 fprintf(stderr, _("Done.\n"));
 334
 335         asprintf(&filename, "%s/rsa_key.priv", confbase);
 336         f = ask_and_open(filename, _("private RSA key"));
 337
 338         if(!f)
 339                 return false;
 340
 341         if(disable_old_keys(f))
 342                 fprintf(stderr, _("Warning: old key(s) found and disabled.\n"));
 343
 344 #ifdef HAVE_FCHMOD
 345         /* Make it unreadable for others. */
 346         fchmod(fileno(f), 0600);
 347 #endif
 348
 349         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 350         fclose(f);
 351         free(filename);
 352
 353         if(name)
 354                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 355         else
 356                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 357
 358         f = ask_and_open(filename, _("public RSA key"));
 359
 360         if(!f)
 361                 return false;
 362
 363         if(disable_old_keys(f))
 364                 fprintf(stderr, _("Warning: old key(s) found and disabled.\n"));
 365
 366         PEM_write_RSAPublicKey(f, rsa_key);
 367         fclose(f);
 368         free(filename);
 369         if(name)
 370                 free(name);
 371
 372         return true;
 373 }
 374
 375 /*
 376   Set all files and paths according to netname
 377 */
 378 static void make_names(void)
 379 {
 380 #ifdef HAVE_MINGW
 381         HKEY key;
 382         char installdir[1024] = "";
 383         long len = sizeof(installdir);
 384 #endif
 385
 386         if(netname)
 387                 asprintf(&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                                 asprintf(&logfilename, "%s/log/%s.log", identname);
 396                         if(!confbase) {
 397                                 if(netname)
 398                                         asprintf(&confbase, "%s/%s", installdir, netname);
 399                                 else
 400                                         asprintf(&confbase, "%s", installdir);
 401                         }
 402                 }
 403                 RegCloseKey(key);
 404                 if(*installdir)
 405                         return;
 406         }
 407 #endif
 408
 409         if(!pidfilename)
 410                 asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 411
 412         if(!logfilename)
 413                 asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 414
 415         if(netname) {
 416                 if(!confbase)
 417                         asprintf(&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                         asprintf(&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, _("%s failed"), "initgroups()");
 456                         return false;
 457                 }
 458                 endgrent();
 459                 endpwent();
 460         }
 461         if (do_chroot) {
 462                 tzset();        /* for proper timestamps in logs */
 463                 if (chroot(confbase) != 0 || chdir(".") != 0) {
 464                         logger(LOG_ERR, _("%s failed"), "chroot()");
 465                         return false;
 466                 }
 467                 free(confbase);
 468                 confbase = xstrdup("");
 469         }
 470         if (switchuser)
 471                 if (setuid(uid) != 0) {
 472                         logger(LOG_ERR, _("%s failed"), "setuid()");
 473                         return false;
 474                 }
 475 #endif
 476         return true;
 477 }
 478
 479 int main(int argc, char **argv)
 480 {
 481         program_name = argv[0];
 482
 483         setlocale(LC_ALL, "");
 484         bindtextdomain(PACKAGE, LOCALEDIR);
 485         textdomain(PACKAGE);
 486
 487         if(!parse_options(argc, argv))
 488                 return 1;
 489
 490         make_names();
 491
 492         if(show_version) {
 493                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 494                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 495                 printf(_("Copyright (C) 1998-2009 Ivo Timmermans, Guus Sliepen and others.\n"
 496                                 "See the AUTHORS file for a complete list.\n\n"
 497                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 498                                 "and you are welcome to redistribute it under certain conditions;\n"
 499                                 "see the file COPYING for details.\n"));
 500
 501                 return 0;
 502         }
 503
 504         if(show_help) {
 505                 usage(false);
 506                 return 0;
 507         }
 508
 509         if(kill_tincd)
 510                 return !kill_other(kill_tincd);
 511
 512         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 513
 514         /* Lock all pages into memory if requested */
 515
 516         if(do_mlock)
 517 #ifdef HAVE_MLOCKALL
 518                 if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
 519                         logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 520                                    strerror(errno));
 521 #else
 522         {
 523                 logger(LOG_ERR, _("mlockall() not supported on this platform!"));
 524 #endif
 525                 return -1;
 526         }
 527
 528         g_argv = argv;
 529
 530         init_configuration(&config_tree);
 531
 532         /* Slllluuuuuuurrrrp! */
 533
 534         RAND_load_file("/dev/urandom", 1024);
 535
 536         ENGINE_load_builtin_engines();
 537         ENGINE_register_all_complete();
 538
 539         OpenSSL_add_all_algorithms();
 540
 541         if(generate_keys) {
 542                 read_server_config();
 543                 return !keygen(generate_keys);
 544         }
 545
 546         if(!read_server_config())
 547                 return 1;
 548
 549         if(lzo_init() != LZO_E_OK) {
 550                 logger(LOG_ERR, _("Error initializing LZO compressor!"));
 551                 return 1;
 552         }
 553
 554 #ifdef HAVE_MINGW
 555         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 556                 logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError()));
 557                 return 1;
 558         }
 559
 560         if(!do_detach || !init_service())
 561                 return main2(argc, argv);
 562         else
 563                 return 1;
 564 }
 565
 566 int main2(int argc, char **argv)
 567 {
 568 #endif
 569
 570         if(!detach())
 571                 return 1;
 572
 573         /* Setup sockets and open device. */
 574
 575         if(!setup_network())
 576                 goto end;
 577
 578         /* drop privileges */
 579         if (!drop_privs())
 580                 goto end;
 581
 582         /* Initiate all outgoing connections. */
 583
 584         try_outgoing_connections();
 585
 586         /* Start main loop. It only exits when tinc is killed. */
 587
 588         status = main_loop();
 589
 590         /* Shutdown properly. */
 591
 592         ifdebug(CONNECTIONS)
 593                 dump_device_stats();
 594
 595         close_network_connections();
 596
 597 end:
 598         logger(LOG_NOTICE, _("Terminating"));
 599
 600 #ifndef HAVE_MINGW
 601         remove_pid(pidfilename);
 602 #endif
 603
 604         EVP_cleanup();
 605         ENGINE_cleanup();
 606         CRYPTO_cleanup_all_ex_data();
 607         ERR_remove_state(0);
 608         ERR_free_strings();
 609
 610         exit_configuration(&config_tree);
 611         free_names();
 612
 613         return status;
 614 }