5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2002 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
21 * Created: Wed Mar 19 00:17:12 1997
23 * This is the main program for the SILC daemon. This parses command
24 * line arguments and creates the server object.
28 #include "serverincludes.h"
29 #include "server_internal.h"
30 #include "silcversion.h"
32 /* For now, we'll have this one server context global for this module. */
33 static SilcServer silcd;
35 static void silc_usage(void);
36 static char *silc_server_create_identifier(void);
37 static int silc_server_create_key_pair(char *pkcs_name, int bits, char *path,
39 SilcPublicKey *ret_pub_key,
40 SilcPrivateKey *ret_prv_key);
42 /* Long command line options */
43 static struct option long_opts[] =
45 { "config-file", 1, NULL, 'f' },
46 { "passphrase", 1, NULL, 'p' },
47 { "debug", 2, NULL, 'd' },
48 { "debug-level", 1, NULL, 'D' },
49 { "hexdump", 0, NULL, 'x' },
50 { "help", 0, NULL, 'h' },
51 { "foreground", 0, NULL, 'F' },
52 { "version", 0, NULL,'V' },
54 /* Key management options */
55 { "create-key-pair", 1, NULL, 'C' },
56 { "pkcs", 1, NULL, 10 },
57 { "bits", 1, NULL, 11 },
58 { "identifier", 1, NULL, 12 },
63 /* Command line option variables */
64 static char *opt_keypath = NULL;
65 static char *opt_pkcs = "rsa";
66 static char *opt_identifier = NULL;
67 static int opt_bits = 2048;
69 /* Prints out the usage of silc client */
71 static void silc_usage(void)
74 "Usage: silcd [options]\n"
77 " -f --config-file=FILE Alternate configuration file\n"
78 " -d --debug=string Enable debugging (Implies --foreground)\n"
79 " -D --debug-level=level Enable debugging (Implies --foreground)\n"
80 " -x --hexdump Enable hexdumps (Implies --debug)\n"
81 " -h --help Display this message\n"
82 " -F --foreground Dont fork\n"
83 " -V --version Display version\n"
85 " Key Management Options:\n"
86 " -C, --create-key-pair=PATH Create new public key pair\n"
87 " --pkcs=PKCS Set the PKCS of the public key pair\n"
88 " --bits=VALUE Set length of the public key pair\n"
89 " --identifier=IDENTIFIER Public key identifier\n"
91 " The public key identifier may be of the following format:\n"
93 " UN=<username>, HN=<hostname or IP>, RN=<real name>, E=<email>,\n"
94 " O=<organization>, C=<country>\n"
96 " The UN and HN must be provided, the others are optional. If the\n"
97 " --identifier option is not used an identifier will be created for\n"
98 " the public key automatically.\n"
100 " Example identifier: \"UN=foobar, HN=foo.bar.com, RN=Foo T. Bar, \n"
101 " E=foo@bar.com, C=FI\"\n"
106 /* Die if a *valid* pid file exists already */
108 static void silc_server_checkpid(SilcServer silcd)
110 if (silcd->config->server_info->pid_file) {
115 SILC_LOG_DEBUG(("Checking for another silcd running"));
116 buf = silc_file_readfile(silcd->config->server_info->pid_file, &buf_len);
123 kill(oldpid, SIGCHLD); /* this signal does nothing, check if alive */
124 if (errno != ESRCH) {
125 fprintf(stderr, "\nI detected another daemon running with the "
127 fprintf(stderr, "Please change the config file, or erase the %s\n",
128 silcd->config->server_info->pid_file);
134 /* Drop root privileges. If some system call fails, die. */
136 static void silc_server_drop_privs(SilcServer server)
138 /* Are we executing silcd as root or a regular user? */
140 SILC_LOG_DEBUG(("Server started as user"));
147 SILC_LOG_DEBUG(("Server started as root. Dropping privileges."));
149 /* Get the values given for user and group in configuration file */
150 user = server->config->server_info->user;
151 group = server->config->server_info->group;
153 if (!user || !group) {
154 fprintf(stderr, "Error:"
155 "\tSILC server must not be run as root. For the security of your\n"
156 "\tsystem it is strongly suggested that you run SILC under dedicated\n"
157 "\tuser account. Modify the ServerInfo configuration section to run\n"
158 "\tthe server as non-root user.\n");
162 /* Check whether the user/group does not begin with a number */
163 if (isdigit(user[0]) || isdigit(group[0])) {
164 SILC_LOG_DEBUG(("User and/or group starts with a number"));
165 fprintf(stderr, "Invalid user and/or group information\n");
166 fprintf(stderr, "Please assign them as names, not numbers\n");
170 if (!(pw = getpwnam(user))) {
171 fprintf(stderr, "Error: No such user %s found.\n", user);
174 if (!(gr = getgrnam(group))) {
175 fprintf(stderr, "Error: No such group %s found.\n", group);
179 /* Check whether user and/or group is set to root. If yes, exit
180 immediately. Otherwise, setgid and setuid server to user.group */
181 if ((gr->gr_gid == 0) || (pw->pw_uid == 0)) {
182 fprintf(stderr, "Error:"
183 "\tSILC server must not be run as root. For the security of your\n"
184 "\tsystem it is strongly suggested that you run SILC under dedicated\n"
185 "\tuser account. Modify the ServerInfo configuration section to run\n"
186 "\tthe server as non-root user.\n");
190 SILC_LOG_DEBUG(("Changing to group %s (gid=%u)", group, gr->gr_gid));
191 if (setgid(gr->gr_gid) != 0) {
192 fprintf(stderr, "Error: Failed setgid() to %s (gid=%u). Exiting.\n",
196 #if defined HAVE_SETGROUPS && defined HAVE_INITGROUPS
197 SILC_LOG_DEBUG(("Removing supplementary groups"));
198 if (setgroups(0, NULL) != 0) {
199 fprintf(stderr, "Error: Failed setgroups() to NULL. Exiting.\n");
202 SILC_LOG_DEBUG(("Setting supplementary groups for user %s", user));
203 if (initgroups(user, gr->gr_gid) != 0) {
204 fprintf(stderr, "Error: Failed initgroups() for user %s (gid=%u). "
205 "Exiting.\n", user, gr->gr_gid);
209 SILC_LOG_DEBUG(("Changing to user %s (uid=%u)", user, pw->pw_uid));
210 if (setuid(pw->pw_uid) != 0) {
211 fprintf(stderr, "Error: Failed to setuid() to %s (gid=%u). Exiting.\n",
218 /* Fork server to background */
220 static void silc_server_daemonise(SilcServer server)
224 SILC_LOG_DEBUG(("Forking SILC server to background"));
226 if ((i = fork()) < 0) {
227 fprintf(stderr, "Error: fork() failed: %s\n", strerror(errno));
231 if (i) /* Kill the parent */
234 server->background = TRUE;
237 /* XXX close stdin, stdout, stderr -- before this, check that all writes
238 to stderr are changed to SILC_SERVER_LOG_ERROR() */
241 static void signal_handler(int sig)
243 /* Mark the signal to be caller after this signal is over. */
244 silc_schedule_signal_call(silcd->schedule, sig);
247 SILC_TASK_CALLBACK(got_hup)
249 /* First, reset all log files (they might have been deleted) */
250 silc_log_reset_all();
252 /* Rehash the configuration file */
253 silc_server_rehash(silcd);
256 SILC_TASK_CALLBACK(stop_server)
258 /* Stop scheduler, the program will stop eventually after noticing
259 that the scheduler is down. */
260 silc_schedule_stop(silcd->schedule);
263 /* Dump server statistics into a file into /tmp directory */
265 SILC_TASK_CALLBACK(dump_stats)
270 memset(filename, 0, sizeof(filename));
271 snprintf(filename, sizeof(filename) - 1, "/tmp/silcd.%d.stats", getpid());
272 fdd = fopen(filename, "w+");
276 #define STAT_OUTPUT(fmt, stat) fprintf(fdd, fmt "\n", (int)stat);
278 fprintf(fdd, "SILC Server %s Statistics\n\n", silcd->server_name);
279 fprintf(fdd, "Local Stats:\n");
280 STAT_OUTPUT(" My clients : %d", silcd->stat.my_clients);
281 STAT_OUTPUT(" My servers : %d", silcd->stat.my_servers);
282 STAT_OUTPUT(" My routers : %d", silcd->stat.my_routers);
283 STAT_OUTPUT(" My channels : %d", silcd->stat.my_channels);
284 STAT_OUTPUT(" My joined users : %d", silcd->stat.my_chanclients);
285 STAT_OUTPUT(" My aways : %d", silcd->stat.my_aways);
286 STAT_OUTPUT(" My detached clients : %d", silcd->stat.my_detached);
287 STAT_OUTPUT(" My server operators : %d", silcd->stat.my_server_ops);
288 STAT_OUTPUT(" My router operators : %d", silcd->stat.my_router_ops);
289 fprintf(fdd, "\nGlobal Stats:\n");
290 STAT_OUTPUT(" Cell clients : %d", silcd->stat.cell_clients);
291 STAT_OUTPUT(" Cell servers : %d", silcd->stat.cell_servers);
292 STAT_OUTPUT(" Cell channels : %d", silcd->stat.cell_channels);
293 STAT_OUTPUT(" Cell joined users : %d", silcd->stat.cell_chanclients);
294 STAT_OUTPUT(" All clients : %d", silcd->stat.clients);
295 STAT_OUTPUT(" All servers : %d", silcd->stat.servers);
296 STAT_OUTPUT(" All routers : %d", silcd->stat.routers);
297 STAT_OUTPUT(" All channels : %d", silcd->stat.channels);
298 STAT_OUTPUT(" All joined users : %d", silcd->stat.chanclients);
299 STAT_OUTPUT(" All aways : %d", silcd->stat.aways);
300 STAT_OUTPUT(" All detached clients : %d", silcd->stat.detached);
301 STAT_OUTPUT(" All server operators : %d", silcd->stat.server_ops);
302 STAT_OUTPUT(" All router operators : %d", silcd->stat.router_ops);
303 fprintf(fdd, "\nGeneral Stats:\n");
304 STAT_OUTPUT(" Connection attempts : %d", silcd->stat.conn_attempts);
305 STAT_OUTPUT(" Connection failures : %d", silcd->stat.conn_failures);
306 STAT_OUTPUT(" Authentication attempts : %d", silcd->stat.auth_attempts);
307 STAT_OUTPUT(" Authentication failures : %d", silcd->stat.auth_failures);
308 STAT_OUTPUT(" Packets sent : %d", silcd->stat.packets_sent);
309 STAT_OUTPUT(" Packets received : %d", silcd->stat.packets_received);
320 static DebugLevel debug_levels[] = {
321 /* Very basic stuff from silcd/ */
322 { 3, "silcd\\.c,server\\.c" },
324 /* More stuff from silcd/ */
325 { 7, "silcd\\.c,server\\.c,command\\.c" },
327 /* All basic stuff from silcd/ */
328 { 10, "silc_server_*" },
330 /* All from silcd/ */
331 { 15, "*silcd*,*serverid*,silc_server_*,*idlist*" },
333 /* All from silcd/ and basic stuff from libs */
334 { 20, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,*silcske*" },
336 /* All from silcd/ and more stuff from libs */
337 { 25, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,"
338 "*silcpacket*,*ske*,*silcrng*" },
340 /* All from silcd/ and even more stuff from libs */
341 { 30, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,"
342 "*silcpacket*,*ske*,*silcrng*,*command*,*channel*,*private*,*notify*" },
344 /* All from silcd/ and even more stuff from libs + all from silccore */
345 { 35, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,"
346 "*silcpacket*,*ske*,*silcrng*,*command*,*channel*,*private*,*notify*"
347 "*silcid*,*argument*" },
349 /* All from silcd/, all from silccore, silccrypt and silcmath */
350 { 40, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,"
351 "*silcpacket*,*ske*,*silcrng*,*command*,*channel*,*private*,*notify*"
352 "*silcid*,*argument*,*pkcs*,*hmac*,*hash*,*cipher*,silc_math*" },
354 /* All from silcd/, all from silccore, silccrypt and silcmath + stuff
356 { 45, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,"
357 "*silcpacket*,*ske*,*silcrng*,*command*,*channel*,*private*,*notify*"
358 "*silcid*,*argument*,*pkcs*,*hmac*,*hash*,*cipher*,silc_math*,*sim*"
361 /* All from silcd/, all from silccore, silccrypt and silcmath + more stuff
363 { 50, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,"
364 "*silcpacket*,*ske*,*silcrng*,*command*,*channel*,*private*,*notify*"
365 "*silcid*,*argument*,*pkcs*,*hmac*,*hash*,*cipher*,silc_math*,*sim*"
366 "*sockconn*,*net*" },
368 /* All from silcd/, all from silccore, silccrypt and silcmath + more stuff
370 { 55, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,"
371 "*silcpacket*,*ske*,*silcrng*,*command*,*channel*,*private*,*notify*"
372 "*silcid*,*argument*,*pkcs*,*hmac*,*hash*,*cipher*,silc_math*,*sim*"
373 "*sockconn*,*net*,*log*,*config*" },
381 static void silc_get_debug_level(int level)
388 for (i = 0; debug_levels[i].string; i++)
389 if (level <= debug_levels[i].level) {
390 silc_log_set_debug_string(debug_levels[i].string);
395 /* This function should not be called directly but throught the wrapper
396 macro SILC_SERVER_LOG_STDERR() */
398 void silc_server_stderr(char *message)
400 if (silcd->background)
401 silc_log_output(SILC_LOG_ERROR, message);
403 fprintf(stderr, "%s", message);
408 int main(int argc, char **argv)
410 int ret, opt, option_index;
411 bool foreground = FALSE;
412 bool opt_create_keypair = FALSE;
413 char *silcd_config_file = NULL;
416 /* Parse command line arguments */
418 while ((opt = getopt_long(argc, argv, "f:p:d:D:xhFVC:",
419 long_opts, &option_index)) != EOF) {
425 printf("SILCd Secure Internet Live Conferencing daemon, "
426 "version %s (base: SILC Toolkit %s)\n",
427 silc_dist_version, silc_version);
428 printf("(c) 1997 - 2002 Pekka Riikonen "
429 "<priikone@silcnet.org>\n");
436 silc_log_set_debug_string(optarg);
437 foreground = TRUE; /* implied */
438 silc_log_quick = TRUE; /* implied */
441 "Run-time debugging is not enabled. To enable it recompile\n"
442 "the server with --enable-debug configuration option.\n");
449 silc_get_debug_level(atoi(optarg));
450 foreground = TRUE; /* implied */
451 silc_log_quick = TRUE; /* implied */
454 "Run-time debugging is not enabled. To enable it recompile\n"
455 "the server with --enable-debug configuration option.\n");
460 silc_debug_hexdump = TRUE;
461 silc_debug = TRUE; /* implied */
462 foreground = TRUE; /* implied */
463 silc_log_quick = TRUE; /* implied */
466 "Run-time debugging is not enabled. To enable it recompile\n"
467 "the server with --enable-debug configuration option.\n");
471 silcd_config_file = strdup(optarg);
478 * Key management options
481 opt_create_keypair = TRUE;
483 opt_keypath = strdup(optarg);
487 opt_pkcs = strdup(optarg);
491 opt_bits = atoi(optarg);
495 opt_identifier = strdup(optarg);
505 if (opt_create_keypair == TRUE) {
506 /* Create new key pair and exit */
507 silc_cipher_register_default();
508 silc_pkcs_register_default();
509 silc_hash_register_default();
510 silc_hmac_register_default();
511 silc_server_create_key_pair(opt_pkcs, opt_bits, opt_keypath,
512 opt_identifier, NULL, NULL);
516 /* Default configuration file */
517 if (!silcd_config_file)
518 silcd_config_file = strdup(SILC_SERVER_CONFIG_FILE);
520 /* Create SILC Server object */
521 ret = silc_server_alloc(&silcd);
525 /* Read configuration files */
526 silcd->config = silc_server_config_alloc(silcd_config_file);
527 if (silcd->config == NULL)
529 silcd->config_file = silcd_config_file;
531 /* Check for another silcd running */
532 silc_server_checkpid(silcd);
534 /* Initialize the server */
535 if (silc_server_init(silcd) == FALSE)
539 sa.sa_handler = SIG_IGN;
541 sigemptyset(&sa.sa_mask);
542 sigaction(SIGPIPE, &sa, NULL);
543 sa.sa_handler = signal_handler;
544 sigaction(SIGHUP, &sa, NULL);
545 sigaction(SIGTERM, &sa, NULL);
546 sigaction(SIGINT, &sa, NULL);
547 sigaction(SIGUSR1, &sa, NULL);
548 silc_schedule_signal_register(silcd->schedule, SIGHUP, got_hup, NULL);
549 silc_schedule_signal_register(silcd->schedule, SIGTERM, stop_server, NULL);
550 silc_schedule_signal_register(silcd->schedule, SIGINT, stop_server, NULL);
551 silc_schedule_signal_register(silcd->schedule, SIGUSR1, dump_stats, NULL);
554 /* Before running the server, fork to background. */
555 silc_server_daemonise(silcd);
557 /* If set, write pid to file */
558 if (silcd->config->server_info->pid_file) {
559 char buf[10], *pidfile = silcd->config->server_info->pid_file;
561 snprintf(buf, sizeof(buf) - 1, "%d\n", getpid());
562 silc_file_writefile(pidfile, buf, strlen(buf));
566 /* Drop root if we are not in debug mode, so you don't need to bother about
567 file writing permissions and so on */
569 silc_server_drop_privs(silcd);
571 /* Run the server. When this returns the server has been stopped
573 silc_server_run(silcd);
575 /* Stop the server and free it. */
576 silc_server_stop(silcd);
577 silc_server_config_destroy(silcd->config);
578 silc_server_free(silcd);
580 /* Flush the logging system */
581 silc_log_flush_all();
583 silc_free(silcd_config_file);
584 silc_free(opt_identifier);
585 silc_free(opt_keypath);
589 silc_free(silcd_config_file);
590 silc_free(opt_identifier);
591 silc_free(opt_keypath);
595 /* Returns identifier string for public key generation. */
597 static char *silc_server_create_identifier(void)
599 char *username = NULL, *realname = NULL;
600 char hostname[256], email[256];
603 realname = silc_get_real_name();
606 memset(hostname, 0, sizeof(hostname));
607 gethostname(hostname, sizeof(hostname));
609 /* Get username (mandatory) */
610 username = silc_get_username();
614 /* Create default email address, whether it is right or not */
615 snprintf(email, sizeof(email), "%s@%s", username, hostname);
617 return silc_pkcs_encode_identifier(username, hostname, realname, email,
621 /* Creates new public key and private key pair. This is used only
622 when user wants to create new key pair from command line. */
625 silc_server_create_key_pair(char *pkcs_name, int bits, char *path,
627 SilcPublicKey *ret_pub_key,
628 SilcPrivateKey *ret_prv_key)
631 SilcPublicKey pub_key;
632 SilcPrivateKey prv_key;
636 char pkfile[256], prvfile[256];
638 if (!pkcs_name || !path)
641 if (!silc_pkcs_is_supported(pkcs_name)) {
642 fprintf(stderr, "Unsupported PKCS `%s'", pkcs_name);
650 identifier = silc_server_create_identifier();
652 rng = silc_rng_alloc();
654 silc_rng_global_init(rng);
656 snprintf(pkfile, sizeof(pkfile) - 1, "%s%s", path,
657 SILC_SERVER_PUBLIC_KEY_NAME);
658 snprintf(prvfile, sizeof(prvfile) - 1, "%s%s", path,
659 SILC_SERVER_PRIVATE_KEY_NAME);
662 silc_pkcs_alloc(pkcs_name, &pkcs);
663 silc_pkcs_generate_key(pkcs, bits, rng);
665 /* Save public key into file */
666 key = silc_pkcs_get_public_key(pkcs, &key_len);
667 pub_key = silc_pkcs_public_key_alloc(silc_pkcs_get_name(pkcs), identifier,
669 silc_pkcs_save_public_key(pkfile, pub_key, SILC_PKCS_FILE_PEM);
671 *ret_pub_key = pub_key;
673 silc_pkcs_public_key_free(pub_key);
675 memset(key, 0, sizeof(key_len));
678 /* Save private key into file */
679 key = silc_pkcs_get_private_key(pkcs, &key_len);
680 prv_key = silc_pkcs_private_key_alloc(silc_pkcs_get_name(pkcs),
682 silc_pkcs_save_private_key(prvfile, prv_key, NULL, SILC_PKCS_FILE_BIN);
684 *ret_prv_key = prv_key;
686 silc_pkcs_private_key_free(prv_key);
688 printf("Public key has been saved into `%s'\n", pkfile);
689 printf("Private key has been saved into `%s'\n", prvfile);
691 memset(key, 0, sizeof(key_len));
695 silc_pkcs_free(pkcs);