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 #ifndef HAVE_MLOCKALL
 164                                 logger(LOG_ERR, _("mlockall() not supported on this platform!"));
 165                                 return false;
 166 #else
 167                                 do_mlock = true;
 168                                 break;
 169 #endif
 170
 171                         case 'd':                               /* inc debug level */
 172                                 if(optarg)
 173                                         debug_level = atoi(optarg);
 174                                 else
 175                                         debug_level++;
 176                                 break;
 177
 178                         case 'k':                               /* kill old tincds */
 179 #ifndef HAVE_MINGW
 180                                 if(optarg) {
 181                                         if(!strcasecmp(optarg, "HUP"))
 182                                                 kill_tincd = SIGHUP;
 183                                         else if(!strcasecmp(optarg, "TERM"))
 184                                                 kill_tincd = SIGTERM;
 185                                         else if(!strcasecmp(optarg, "KILL"))
 186                                                 kill_tincd = SIGKILL;
 187                                         else if(!strcasecmp(optarg, "USR1"))
 188                                                 kill_tincd = SIGUSR1;
 189                                         else if(!strcasecmp(optarg, "USR2"))
 190                                                 kill_tincd = SIGUSR2;
 191                                         else if(!strcasecmp(optarg, "WINCH"))
 192                                                 kill_tincd = SIGWINCH;
 193                                         else if(!strcasecmp(optarg, "INT"))
 194                                                 kill_tincd = SIGINT;
 195                                         else if(!strcasecmp(optarg, "ALRM"))
 196                                                 kill_tincd = SIGALRM;
 197                                         else {
 198                                                 kill_tincd = atoi(optarg);
 199
 200                                                 if(!kill_tincd) {
 201                                                         fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
 202                                                                         optarg);
 203                                                         usage(true);
 204                                                         return false;
 205                                                 }
 206                                         }
 207                                 } else
 208                                         kill_tincd = SIGTERM;
 209 #else
 210                                         kill_tincd = 1;
 211 #endif
 212                                 break;
 213
 214                         case 'n':                               /* net name given */
 215                                 netname = xstrdup(optarg);
 216                                 break;
 217
 218                         case 'K':                               /* generate public/private keypair */
 219                                 if(optarg) {
 220                                         generate_keys = atoi(optarg);
 221
 222                                         if(generate_keys < 512) {
 223                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 224                                                                 optarg);
 225                                                 usage(true);
 226                                                 return false;
 227                                         }
 228
 229                                         generate_keys &= ~7;    /* Round it to bytes */
 230                                 } else
 231                                         generate_keys = 1024;
 232                                 break;
 233
 234                         case 'R':                               /* chroot to NETNAME dir */
 235                                 do_chroot = true;
 236                                 break;
 237
 238                         case 'U':                               /* setuid to USER */
 239                                 switchuser = optarg;
 240                                 break;
 241
 242                         case 1:                                 /* show help */
 243                                 show_help = true;
 244                                 break;
 245
 246                         case 2:                                 /* show version */
 247                                 show_version = true;
 248                                 break;
 249
 250                         case 3:                                 /* bypass security */
 251                                 bypass_security = true;
 252                                 break;
 253
 254                         case 4:                                 /* write log entries to a file */
 255                                 use_logfile = true;
 256                                 if(optarg)
 257                                         logfilename = xstrdup(optarg);
 258                                 break;
 259
 260                         case 5:                                 /* write PID to a file */
 261                                 pidfilename = xstrdup(optarg);
 262                                 break;
 263
 264                         case '?':
 265                                 usage(true);
 266                                 return false;
 267
 268                         default:
 269                                 break;
 270                 }
 271         }
 272
 273         return true;
 274 }
 275
 276 /* This function prettyprints the key generation process */
 277
 278 static void indicator(int a, int b, void *p)
 279 {
 280         switch (a) {
 281                 case 0:
 282                         fprintf(stderr, ".");
 283                         break;
 284
 285                 case 1:
 286                         fprintf(stderr, "+");
 287                         break;
 288
 289                 case 2:
 290                         fprintf(stderr, "-");
 291                         break;
 292
 293                 case 3:
 294                         switch (b) {
 295                                 case 0:
 296                                         fprintf(stderr, " p\n");
 297                                         break;
 298
 299                                 case 1:
 300                                         fprintf(stderr, " q\n");
 301                                         break;
 302
 303                                 default:
 304                                         fprintf(stderr, "?");
 305                         }
 306                         break;
 307
 308                 default:
 309                         fprintf(stderr, "?");
 310         }
 311 }
 312
 313 /*
 314   Generate a public/private RSA keypair, and ask for a file to store
 315   them in.
 316 */
 317 static bool keygen(int bits)
 318 {
 319         RSA *rsa_key;
 320         FILE *f;
 321         char *name = NULL;
 322         char *filename;
 323
 324         get_config_string(lookup_config(config_tree, "Name"), &name);
 325
 326         if(name && !check_id(name)) {
 327                 fprintf(stderr, _("Invalid name for myself!\n"));
 328                 return false;
 329         }
 330
 331         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 332         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 333
 334         if(!rsa_key) {
 335                 fprintf(stderr, _("Error during key generation!\n"));
 336                 return false;
 337         } else
 338                 fprintf(stderr, _("Done.\n"));
 339
 340         asprintf(&filename, "%s/rsa_key.priv", confbase);
 341         f = ask_and_open(filename, _("private RSA key"));
 342
 343         if(!f)
 344                 return false;
 345
 346         if(disable_old_keys(f))
 347                 fprintf(stderr, _("Warning: old key(s) found and disabled.\n"));
 348
 349 #ifdef HAVE_FCHMOD
 350         /* Make it unreadable for others. */
 351         fchmod(fileno(f), 0600);
 352 #endif
 353
 354         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 355         fclose(f);
 356         free(filename);
 357
 358         if(name)
 359                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 360         else
 361                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 362
 363         f = ask_and_open(filename, _("public RSA key"));
 364
 365         if(!f)
 366                 return false;
 367
 368         if(disable_old_keys(f))
 369                 fprintf(stderr, _("Warning: old key(s) found and disabled.\n"));
 370
 371         PEM_write_RSAPublicKey(f, rsa_key);
 372         fclose(f);
 373         free(filename);
 374         if(name)
 375                 free(name);
 376
 377         return true;
 378 }
 379
 380 /*
 381   Set all files and paths according to netname
 382 */
 383 static void make_names(void)
 384 {
 385 #ifdef HAVE_MINGW
 386         HKEY key;
 387         char installdir[1024] = "";
 388         long len = sizeof(installdir);
 389 #endif
 390
 391         if(netname)
 392                 asprintf(&identname, "tinc.%s", netname);
 393         else
 394                 identname = xstrdup("tinc");
 395
 396 #ifdef HAVE_MINGW
 397         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 398                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 399                         if(!logfilename)
 400                                 asprintf(&logfilename, "%s/log/%s.log", identname);
 401                         if(!confbase) {
 402                                 if(netname)
 403                                         asprintf(&confbase, "%s/%s", installdir, netname);
 404                                 else
 405                                         asprintf(&confbase, "%s", installdir);
 406                         }
 407                 }
 408                 RegCloseKey(key);
 409                 if(*installdir)
 410                         return;
 411         }
 412 #endif
 413
 414         if(!pidfilename)
 415                 asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 416
 417         if(!logfilename)
 418                 asprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 419
 420         if(netname) {
 421                 if(!confbase)
 422                         asprintf(&confbase, CONFDIR "/tinc/%s", netname);
 423                 else
 424                         logger(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 425         } else {
 426                 if(!confbase)
 427                         asprintf(&confbase, CONFDIR "/tinc");
 428         }
 429 }
 430
 431 static void free_names() {
 432         if (identname) free(identname);
 433         if (netname) free(netname);
 434         if (pidfilename) free(pidfilename);
 435         if (logfilename) free(logfilename);
 436         if (confbase) free(confbase);
 437 }
 438
 439 static bool drop_privs() {
 440 #ifdef HAVE_MINGW
 441         if (switchuser) {
 442                 logger(LOG_ERR, _("%s not supported on this platform"), "-U");
 443                 return false;
 444         }
 445         if (do_chroot) {
 446                 logger(LOG_ERR, _("%s not supported on this platform"), "-R");
 447                 return false;
 448         }
 449 #else
 450         uid_t uid = 0;
 451         if (switchuser) {
 452                 struct passwd *pw = getpwnam(switchuser);
 453                 if (!pw) {
 454                         logger(LOG_ERR, _("unknown user `%s'"), switchuser);
 455                         return false;
 456                 }
 457                 uid = pw->pw_uid;
 458                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 459                     setgid(pw->pw_gid) != 0) {
 460                         logger(LOG_ERR, _("%s failed"), "initgroups()");
 461                         return false;
 462                 }
 463                 endgrent();
 464                 endpwent();
 465         }
 466         if (do_chroot) {
 467                 tzset();        /* for proper timestamps in logs */
 468                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 469                         logger(LOG_ERR, _("%s failed"), "chroot()");
 470                         return false;
 471                 }
 472                 free(confbase);
 473                 confbase = xstrdup("");
 474         }
 475         if (switchuser)
 476                 if (setuid(uid) != 0) {
 477                         logger(LOG_ERR, _("%s failed"), "setuid()");
 478                         return false;
 479                 }
 480 #endif
 481         return true;
 482 }
 483
 484 int main(int argc, char **argv)
 485 {
 486         program_name = argv[0];
 487
 488         setlocale(LC_ALL, "");
 489         bindtextdomain(PACKAGE, LOCALEDIR);
 490         textdomain(PACKAGE);
 491
 492         if(!parse_options(argc, argv))
 493                 return 1;
 494
 495         make_names();
 496
 497         if(show_version) {
 498                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 499                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 500                 printf(_("Copyright (C) 1998-2009 Ivo Timmermans, Guus Sliepen and others.\n"
 501                                 "See the AUTHORS file for a complete list.\n\n"
 502                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 503                                 "and you are welcome to redistribute it under certain conditions;\n"
 504                                 "see the file COPYING for details.\n"));
 505
 506                 return 0;
 507         }
 508
 509         if(show_help) {
 510                 usage(false);
 511                 return 0;
 512         }
 513
 514         if(kill_tincd)
 515                 return !kill_other(kill_tincd);
 516
 517         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 518
 519         g_argv = argv;
 520
 521         init_configuration(&config_tree);
 522
 523         /* Slllluuuuuuurrrrp! */
 524
 525         RAND_load_file("/dev/urandom", 1024);
 526
 527         ENGINE_load_builtin_engines();
 528         ENGINE_register_all_complete();
 529
 530         OpenSSL_add_all_algorithms();
 531
 532         if(generate_keys) {
 533                 read_server_config();
 534                 return !keygen(generate_keys);
 535         }
 536
 537         if(!read_server_config())
 538                 return 1;
 539
 540         if(lzo_init() != LZO_E_OK) {
 541                 logger(LOG_ERR, _("Error initializing LZO compressor!"));
 542                 return 1;
 543         }
 544
 545 #ifdef HAVE_MINGW
 546         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 547                 logger(LOG_ERR, _("System call `%s' failed: %s"), "WSAStartup", winerror(GetLastError()));
 548                 return 1;
 549         }
 550
 551         if(!do_detach || !init_service())
 552                 return main2(argc, argv);
 553         else
 554                 return 1;
 555 }
 556
 557 int main2(int argc, char **argv)
 558 {
 559 #endif
 560
 561         if(!detach())
 562                 return 1;
 563
 564 #ifdef HAVE_MLOCKALL
 565         /* Lock all pages into memory if requested.
 566          * This has to be done after daemon()/fork() so it works for child.
 567          * No need to do that in parent as it's very short-lived. */
 568         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
 569                 logger(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 570                    strerror(errno));
 571                 return 1;
 572         }
 573 #endif
 574
 575         /* Setup sockets and open device. */
 576
 577         if(!setup_network())
 578                 goto end;
 579
 580         /* drop privileges */
 581         if (!drop_privs())
 582                 goto end;
 583
 584         /* Initiate all outgoing connections. */
 585
 586         try_outgoing_connections();
 587
 588         /* Start main loop. It only exits when tinc is killed. */
 589
 590         status = main_loop();
 591
 592         /* Shutdown properly. */
 593
 594         ifdebug(CONNECTIONS)
 595                 dump_device_stats();
 596
 597         close_network_connections();
 598
 599 end:
 600         logger(LOG_NOTICE, _("Terminating"));
 601
 602 #ifndef HAVE_MINGW
 603         remove_pid(pidfilename);
 604 #endif
 605
 606         EVP_cleanup();
 607         ENGINE_cleanup();
 608         CRYPTO_cleanup_all_ex_data();
 609         ERR_remove_state(0);
 610         ERR_free_strings();
 611
 612         exit_configuration(&config_tree);
 613         free_names();
 614
 615         return status;
 616 }