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