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                   2000-2012 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         {"option", required_argument, NULL, 'o'},
 118         {NULL, 0, NULL, 0}
 119 };
 120
 121 #ifdef HAVE_MINGW
 122 static struct WSAData wsa_state;
 123 CRITICAL_SECTION mutex;
 124 int main2(int argc, char **argv);
 125 #endif
 126
 127 static void usage(bool status) {
 128         if(status)
 129                 fprintf(stderr, "Try `%s --help\' for more information.\n",
 130                                 program_name);
 131         else {
 132                 printf("Usage: %s [option]...\n\n", program_name);
 133                 printf("  -c, --config=DIR               Read configuration options from DIR.\n"
 134                                 "  -D, --no-detach                Don't fork and detach.\n"
 135                                 "  -d, --debug[=LEVEL]            Increase debug level or set it to LEVEL.\n"
 136                                 "  -k, --kill[=SIGNAL]            Attempt to kill a running tincd and exit.\n"
 137                                 "  -n, --net=NETNAME              Connect to net NETNAME.\n"
 138                                 "  -K, --generate-keys[=BITS]     Generate public/private RSA keypair.\n"
 139                                 "  -L, --mlock                    Lock tinc into main memory.\n"
 140                                 "      --logfile[=FILENAME]       Write log entries to a logfile.\n"
 141                                 "      --pidfile=FILENAME         Write PID to FILENAME.\n"
 142                                 "  -o, --option=[HOST.]KEY=VALUE  Set global/host configuration value.\n"
 143                                 "  -R, --chroot                   chroot to NET dir at startup.\n"
 144                                 "  -U, --user=USER                setuid to given USER at startup.\n"
 145                                 "      --help                     Display this help and exit.\n"
 146                                 "      --version                  Output version information and exit.\n\n");
 147                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 148         }
 149 }
 150
 151 static bool parse_options(int argc, char **argv) {
 152         config_t *cfg;
 153         int r;
 154         int option_index = 0;
 155         int lineno = 0;
 156
 157         cmdline_conf = list_alloc((list_action_t)free_config);
 158
 159         while((r = getopt_long(argc, argv, "c:DLd::k::n:o:K::RU:", long_options, &option_index)) != EOF) {
 160                 switch (r) {
 161                         case 0:                         /* long option */
 162                                 break;
 163
 164                         case 'c':                               /* config file */
 165                                 confbase = xstrdup(optarg);
 166                                 break;
 167
 168                         case 'D':                               /* no detach */
 169                                 do_detach = false;
 170                                 break;
 171
 172                         case 'L':                               /* no detach */
 173 #ifndef HAVE_MLOCKALL
 174                                 logger(LOG_ERR, "%s not supported on this platform", "mlockall()");
 175                                 return false;
 176 #else
 177                                 do_mlock = true;
 178                                 break;
 179 #endif
 180
 181                         case 'd':                               /* inc debug level */
 182                                 if(optarg)
 183                                         debug_level = atoi(optarg);
 184                                 else
 185                                         debug_level++;
 186                                 break;
 187
 188                         case 'k':                               /* kill old tincds */
 189 #ifndef HAVE_MINGW
 190                                 if(optarg) {
 191                                         if(!strcasecmp(optarg, "HUP"))
 192                                                 kill_tincd = SIGHUP;
 193                                         else if(!strcasecmp(optarg, "TERM"))
 194                                                 kill_tincd = SIGTERM;
 195                                         else if(!strcasecmp(optarg, "KILL"))
 196                                                 kill_tincd = SIGKILL;
 197                                         else if(!strcasecmp(optarg, "USR1"))
 198                                                 kill_tincd = SIGUSR1;
 199                                         else if(!strcasecmp(optarg, "USR2"))
 200                                                 kill_tincd = SIGUSR2;
 201                                         else if(!strcasecmp(optarg, "WINCH"))
 202                                                 kill_tincd = SIGWINCH;
 203                                         else if(!strcasecmp(optarg, "INT"))
 204                                                 kill_tincd = SIGINT;
 205                                         else if(!strcasecmp(optarg, "ALRM"))
 206                                                 kill_tincd = SIGALRM;
 207                                         else if(!strcasecmp(optarg, "ABRT"))
 208                                                 kill_tincd = SIGABRT;
 209                                         else {
 210                                                 kill_tincd = atoi(optarg);
 211
 212                                                 if(!kill_tincd) {
 213                                                         fprintf(stderr, "Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n",
 214                                                                         optarg);
 215                                                         usage(true);
 216                                                         return false;
 217                                                 }
 218                                         }
 219                                 } else
 220                                         kill_tincd = SIGTERM;
 221 #else
 222                                         kill_tincd = 1;
 223 #endif
 224                                 break;
 225
 226                         case 'n':                               /* net name given */
 227                                 /* netname "." is special: a "top-level name" */
 228                                 netname = strcmp(optarg, ".") != 0 ?
 229                                                 xstrdup(optarg) : NULL;
 230                                 break;
 231
 232                         case 'o':                               /* option */
 233                                 cfg = parse_config_line(optarg, NULL, ++lineno);
 234                                 if (!cfg)
 235                                         return false;
 236                                 list_insert_tail(cmdline_conf, cfg);
 237                                 break;
 238
 239                         case 'K':                               /* generate public/private keypair */
 240                                 if(optarg) {
 241                                         generate_keys = atoi(optarg);
 242
 243                                         if(generate_keys < 512) {
 244                                                 fprintf(stderr, "Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n",
 245                                                                 optarg);
 246                                                 usage(true);
 247                                                 return false;
 248                                         }
 249
 250                                         generate_keys &= ~7;    /* Round it to bytes */
 251                                 } else
 252                                         generate_keys = 2048;
 253                                 break;
 254
 255                         case 'R':                               /* chroot to NETNAME dir */
 256                                 do_chroot = true;
 257                                 break;
 258
 259                         case 'U':                               /* setuid to USER */
 260                                 switchuser = optarg;
 261                                 break;
 262
 263                         case 1:                                 /* show help */
 264                                 show_help = true;
 265                                 break;
 266
 267                         case 2:                                 /* show version */
 268                                 show_version = true;
 269                                 break;
 270
 271                         case 3:                                 /* bypass security */
 272                                 bypass_security = true;
 273                                 break;
 274
 275                         case 4:                                 /* write log entries to a file */
 276                                 use_logfile = true;
 277                                 if(optarg)
 278                                         logfilename = xstrdup(optarg);
 279                                 break;
 280
 281                         case 5:                                 /* write PID to a file */
 282                                 pidfilename = xstrdup(optarg);
 283                                 break;
 284
 285                         case '?':
 286                                 usage(true);
 287                                 return false;
 288
 289                         default:
 290                                 break;
 291                 }
 292         }
 293
 294         return true;
 295 }
 296
 297 /* This function prettyprints the key generation process */
 298
 299 static void indicator(int a, int b, void *p) {
 300         switch (a) {
 301                 case 0:
 302                         fprintf(stderr, ".");
 303                         break;
 304
 305                 case 1:
 306                         fprintf(stderr, "+");
 307                         break;
 308
 309                 case 2:
 310                         fprintf(stderr, "-");
 311                         break;
 312
 313                 case 3:
 314                         switch (b) {
 315                                 case 0:
 316                                         fprintf(stderr, " p\n");
 317                                         break;
 318
 319                                 case 1:
 320                                         fprintf(stderr, " q\n");
 321                                         break;
 322
 323                                 default:
 324                                         fprintf(stderr, "?");
 325                         }
 326                         break;
 327
 328                 default:
 329                         fprintf(stderr, "?");
 330         }
 331 }
 332
 333 /*
 334   Generate a public/private RSA keypair, and ask for a file to store
 335   them in.
 336 */
 337 static bool keygen(int bits) {
 338         RSA *rsa_key;
 339         FILE *f;
 340         char *name = NULL;
 341         char *filename;
 342
 343         get_config_string(lookup_config(config_tree, "Name"), &name);
 344
 345         if(name && !check_id(name)) {
 346                 fprintf(stderr, "Invalid name for myself!\n");
 347                 return false;
 348         }
 349
 350         fprintf(stderr, "Generating %d bits keys:\n", bits);
 351         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 352
 353         if(!rsa_key) {
 354                 fprintf(stderr, "Error during key generation!\n");
 355                 return false;
 356         } else
 357                 fprintf(stderr, "Done.\n");
 358
 359         xasprintf(&filename, "%s/rsa_key.priv", confbase);
 360         f = ask_and_open(filename, "private RSA key");
 361
 362         if(!f)
 363                 return false;
 364
 365 #ifdef HAVE_FCHMOD
 366         /* Make it unreadable for others. */
 367         fchmod(fileno(f), 0600);
 368 #endif
 369
 370         fputc('\n', f);
 371         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 372         fclose(f);
 373         free(filename);
 374
 375         if(name)
 376                 xasprintf(&filename, "%s/hosts/%s", confbase, name);
 377         else
 378                 xasprintf(&filename, "%s/rsa_key.pub", confbase);
 379
 380         f = ask_and_open(filename, "public RSA key");
 381
 382         if(!f)
 383                 return false;
 384
 385         fputc('\n', f);
 386         PEM_write_RSAPublicKey(f, rsa_key);
 387         fclose(f);
 388         free(filename);
 389         if(name)
 390                 free(name);
 391
 392         return true;
 393 }
 394
 395 /*
 396   Set all files and paths according to netname
 397 */
 398 static void make_names(void) {
 399 #ifdef HAVE_MINGW
 400         HKEY key;
 401         char installdir[1024] = "";
 402         long len = sizeof(installdir);
 403 #endif
 404
 405         if(netname)
 406                 xasprintf(&identname, "tinc.%s", netname);
 407         else
 408                 identname = xstrdup("tinc");
 409
 410 #ifdef HAVE_MINGW
 411         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 412                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 413                         if(!logfilename)
 414                                 xasprintf(&logfilename, "%s/log/%s.log", identname);
 415                         if(!confbase) {
 416                                 if(netname)
 417                                         xasprintf(&confbase, "%s/%s", installdir, netname);
 418                                 else
 419                                         xasprintf(&confbase, "%s", installdir);
 420                         }
 421                 }
 422                 RegCloseKey(key);
 423                 if(*installdir)
 424                         return;
 425         }
 426 #endif
 427
 428         if(!pidfilename)
 429                 xasprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 430
 431         if(!logfilename)
 432                 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
 433
 434         if(netname) {
 435                 if(!confbase)
 436                         xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
 437                 else
 438                         logger(LOG_INFO, "Both netname and configuration directory given, using the latter...");
 439         } else {
 440                 if(!confbase)
 441                         xasprintf(&confbase, CONFDIR "/tinc");
 442         }
 443 }
 444
 445 static void free_names() {
 446         if (identname) free(identname);
 447         if (netname) free(netname);
 448         if (pidfilename) free(pidfilename);
 449         if (logfilename) free(logfilename);
 450         if (confbase) free(confbase);
 451 }
 452
 453 static bool drop_privs() {
 454 #ifdef HAVE_MINGW
 455         if (switchuser) {
 456                 logger(LOG_ERR, "%s not supported on this platform", "-U");
 457                 return false;
 458         }
 459         if (do_chroot) {
 460                 logger(LOG_ERR, "%s not supported on this platform", "-R");
 461                 return false;
 462         }
 463 #else
 464         uid_t uid = 0;
 465         if (switchuser) {
 466                 struct passwd *pw = getpwnam(switchuser);
 467                 if (!pw) {
 468                         logger(LOG_ERR, "unknown user `%s'", switchuser);
 469                         return false;
 470                 }
 471                 uid = pw->pw_uid;
 472                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
 473                     setgid(pw->pw_gid) != 0) {
 474                         logger(LOG_ERR, "System call `%s' failed: %s",
 475                                "initgroups", strerror(errno));
 476                         return false;
 477                 }
 478                 endgrent();
 479                 endpwent();
 480         }
 481         if (do_chroot) {
 482                 tzset();        /* for proper timestamps in logs */
 483                 if (chroot(confbase) != 0 || chdir("/") != 0) {
 484                         logger(LOG_ERR, "System call `%s' failed: %s",
 485                                "chroot", strerror(errno));
 486                         return false;
 487                 }
 488                 free(confbase);
 489                 confbase = xstrdup("");
 490         }
 491         if (switchuser)
 492                 if (setuid(uid) != 0) {
 493                         logger(LOG_ERR, "System call `%s' failed: %s",
 494                                "setuid", strerror(errno));
 495                         return false;
 496                 }
 497 #endif
 498         return true;
 499 }
 500
 501 #ifdef HAVE_MINGW
 502 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
 503 #else
 504 # define NORMAL_PRIORITY_CLASS 0
 505 # define BELOW_NORMAL_PRIORITY_CLASS 10
 506 # define HIGH_PRIORITY_CLASS -10
 507 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
 508 #endif
 509
 510 int main(int argc, char **argv) {
 511         program_name = argv[0];
 512
 513         if(!parse_options(argc, argv))
 514                 return 1;
 515
 516         make_names();
 517
 518         if(show_version) {
 519                 printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
 520                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 521                 printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
 522                                 "See the AUTHORS file for a complete list.\n\n"
 523                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 524                                 "and you are welcome to redistribute it under certain conditions;\n"
 525                                 "see the file COPYING for details.\n");
 526
 527                 return 0;
 528         }
 529
 530         if(show_help) {
 531                 usage(false);
 532                 return 0;
 533         }
 534
 535         if(kill_tincd)
 536                 return !kill_other(kill_tincd);
 537
 538         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
 539
 540         g_argv = argv;
 541
 542         init_configuration(&config_tree);
 543
 544         /* Slllluuuuuuurrrrp! */
 545
 546         RAND_load_file("/dev/urandom", 1024);
 547
 548         ENGINE_load_builtin_engines();
 549         ENGINE_register_all_complete();
 550
 551         OpenSSL_add_all_algorithms();
 552
 553         if(generate_keys) {
 554                 read_server_config();
 555                 return !keygen(generate_keys);
 556         }
 557
 558         if(!read_server_config())
 559                 return 1;
 560
 561 #ifdef HAVE_LZO
 562         if(lzo_init() != LZO_E_OK) {
 563                 logger(LOG_ERR, "Error initializing LZO compressor!");
 564                 return 1;
 565         }
 566 #endif
 567
 568 #ifdef HAVE_MINGW
 569         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 570                 logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 571                 return 1;
 572         }
 573
 574         if(!do_detach || !init_service())
 575                 return main2(argc, argv);
 576         else
 577                 return 1;
 578 }
 579
 580 int main2(int argc, char **argv) {
 581         InitializeCriticalSection(&mutex);
 582         EnterCriticalSection(&mutex);
 583 #endif
 584         char *priority = NULL;
 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         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
 612                 if(!strcasecmp(priority, "Normal")) {
 613                         if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
 614                                 logger(LOG_ERR, "System call `%s' failed: %s",
 615                                        "setpriority", strerror(errno));
 616                                 goto end;
 617                         }
 618                 } else if(!strcasecmp(priority, "Low")) {
 619                         if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
 620                                        logger(LOG_ERR, "System call `%s' failed: %s",
 621                                        "setpriority", strerror(errno));
 622                                 goto end;
 623                         }
 624                 } else if(!strcasecmp(priority, "High")) {
 625                         if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
 626                                 logger(LOG_ERR, "System call `%s' failed: %s",
 627                                        "setpriority", strerror(errno));
 628                                 goto end;
 629                         }
 630                 } else {
 631                         logger(LOG_ERR, "Invalid priority `%s`!", priority);
 632                         goto end;
 633                 }
 634         }
 635
 636         /* drop privileges */
 637         if (!drop_privs())
 638                 goto end;
 639
 640         /* Start main loop. It only exits when tinc is killed. */
 641
 642         status = main_loop();
 643
 644         /* Shutdown properly. */
 645
 646         ifdebug(CONNECTIONS)
 647                 devops.dump_stats();
 648
 649         close_network_connections();
 650
 651 end:
 652         logger(LOG_NOTICE, "Terminating");
 653
 654 #ifndef HAVE_MINGW
 655         remove_pid(pidfilename);
 656 #endif
 657
 658         free(priority);
 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         list_free(cmdline_conf);
 668         free_names();
 669
 670         return status;
 671 }