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 /* Basic stuff from silcd/ */
322 { 5, "silc_server_*" },
324 /* All from silcd/ */
325 { 10, "*silcd*,*serverid*,silc_server_*,*idlist*" },
327 /* All from silcd/ and basic stuff from libs */
328 { 15, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,*silcske*" },
330 /* All from silcd/ and more stuff from libs */
331 { 20, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,"
332 "*silcpacket*,*ske*,*silcrng*" },
334 /* All from silcd/ and even more stuff from libs */
335 { 25, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,"
336 "*silcpacket*,*ske*,*silcrng*,*command*,*channel*,*private*,*notify*" },
338 /* All from silcd/ and even more stuff from libs + all from silccore */
339 { 30, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,"
340 "*silcpacket*,*ske*,*silcrng*,*command*,*channel*,*private*,*notify*"
341 "*silcid*,*argument*" },
343 /* All from silcd/, all from silccore, silccrypt and silcmath */
344 { 35, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,"
345 "*silcpacket*,*ske*,*silcrng*,*command*,*channel*,*private*,*notify*"
346 "*silcid*,*argument*,*pkcs*,*hmac*,*hash*,*cipher*,silc_math*" },
348 /* All from silcd/, all from silccore, silccrypt and silcmath + stuff
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*,*sim*"
355 /* All from silcd/, all from silccore, silccrypt and silcmath + more stuff
357 { 45, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,"
358 "*silcpacket*,*ske*,*silcrng*,*command*,*channel*,*private*,*notify*"
359 "*silcid*,*argument*,*pkcs*,*hmac*,*hash*,*cipher*,silc_math*,*sim*"
360 "*sockconn*,*net*" },
362 /* All from silcd/, all from silccore, silccrypt and silcmath + more stuff
364 { 50, "*silcd*,*serverid*,silc_server_*,*idlist*,*silcauth*,"
365 "*silcpacket*,*ske*,*silcrng*,*command*,*channel*,*private*,*notify*"
366 "*silcid*,*argument*,*pkcs*,*hmac*,*hash*,*cipher*,silc_math*,*sim*"
367 "*sockconn*,*net*,*log*,*config*" },
375 static void silc_get_debug_level(int level)
382 for (i = 0; debug_levels[i].string; i++)
383 if (level <= debug_levels[i].level) {
384 silc_log_set_debug_string(debug_levels[i].string);
389 /* This function should not be called directly but throught the wrapper
390 macro SILC_SERVER_LOG_STDERR() */
392 void silc_server_stderr(char *message)
394 if (silcd->background)
395 silc_log_output(SILC_LOG_ERROR, message);
397 fprintf(stderr, "%s", message);
402 int main(int argc, char **argv)
404 int ret, opt, option_index;
405 bool foreground = FALSE;
406 bool opt_create_keypair = FALSE;
407 char *silcd_config_file = NULL;
410 /* Parse command line arguments */
412 while ((opt = getopt_long(argc, argv, "f:p:d:D:xhFVC:",
413 long_opts, &option_index)) != EOF) {
419 printf("SILCd Secure Internet Live Conferencing daemon, "
420 "version %s (base: SILC Toolkit %s)\n",
421 silc_dist_version, silc_version);
422 printf("(c) 1997 - 2002 Pekka Riikonen "
423 "<priikone@silcnet.org>\n");
430 silc_log_set_debug_string(optarg);
431 foreground = TRUE; /* implied */
432 silc_log_quick = TRUE; /* implied */
435 "Run-time debugging is not enabled. To enable it recompile\n"
436 "the server with --enable-debug configuration option.\n");
443 silc_get_debug_level(atoi(optarg));
444 foreground = TRUE; /* implied */
445 silc_log_quick = TRUE; /* implied */
448 "Run-time debugging is not enabled. To enable it recompile\n"
449 "the server with --enable-debug configuration option.\n");
454 silc_debug_hexdump = TRUE;
455 silc_debug = TRUE; /* implied */
456 foreground = TRUE; /* implied */
457 silc_log_quick = TRUE; /* implied */
460 "Run-time debugging is not enabled. To enable it recompile\n"
461 "the server with --enable-debug configuration option.\n");
465 silcd_config_file = strdup(optarg);
472 * Key management options
475 opt_create_keypair = TRUE;
477 opt_keypath = strdup(optarg);
481 opt_pkcs = strdup(optarg);
485 opt_bits = atoi(optarg);
489 opt_identifier = strdup(optarg);
499 if (opt_create_keypair == TRUE) {
500 /* Create new key pair and exit */
501 silc_cipher_register_default();
502 silc_pkcs_register_default();
503 silc_hash_register_default();
504 silc_hmac_register_default();
505 silc_server_create_key_pair(opt_pkcs, opt_bits, opt_keypath,
506 opt_identifier, NULL, NULL);
510 /* Default configuration file */
511 if (!silcd_config_file)
512 silcd_config_file = strdup(SILC_SERVER_CONFIG_FILE);
514 /* Create SILC Server object */
515 ret = silc_server_alloc(&silcd);
519 /* Read configuration files */
520 silcd->config = silc_server_config_alloc(silcd_config_file);
521 if (silcd->config == NULL)
523 silcd->config_file = silcd_config_file;
525 /* Check for another silcd running */
526 silc_server_checkpid(silcd);
528 /* Initialize the server */
529 if (silc_server_init(silcd) == FALSE)
533 sa.sa_handler = SIG_IGN;
535 sigemptyset(&sa.sa_mask);
536 sigaction(SIGPIPE, &sa, NULL);
537 sa.sa_handler = signal_handler;
538 sigaction(SIGHUP, &sa, NULL);
539 sigaction(SIGTERM, &sa, NULL);
540 sigaction(SIGINT, &sa, NULL);
541 sigaction(SIGUSR1, &sa, NULL);
542 silc_schedule_signal_register(silcd->schedule, SIGHUP, got_hup, NULL);
543 silc_schedule_signal_register(silcd->schedule, SIGTERM, stop_server, NULL);
544 silc_schedule_signal_register(silcd->schedule, SIGINT, stop_server, NULL);
545 silc_schedule_signal_register(silcd->schedule, SIGUSR1, dump_stats, NULL);
548 /* Before running the server, fork to background. */
549 silc_server_daemonise(silcd);
551 /* If set, write pid to file */
552 if (silcd->config->server_info->pid_file) {
553 char buf[10], *pidfile = silcd->config->server_info->pid_file;
555 snprintf(buf, sizeof(buf) - 1, "%d\n", getpid());
556 silc_file_writefile(pidfile, buf, strlen(buf));
560 /* Drop root if we are not in debug mode, so you don't need to bother about
561 file writing permissions and so on */
563 silc_server_drop_privs(silcd);
565 /* Run the server. When this returns the server has been stopped
567 silc_server_run(silcd);
569 /* Stop the server and free it. */
570 silc_server_stop(silcd);
571 silc_server_config_destroy(silcd->config);
572 silc_server_free(silcd);
574 /* Flush the logging system */
575 silc_log_flush_all();
577 silc_free(silcd_config_file);
578 silc_free(opt_identifier);
579 silc_free(opt_keypath);
583 silc_free(silcd_config_file);
584 silc_free(opt_identifier);
585 silc_free(opt_keypath);
589 /* Returns identifier string for public key generation. */
591 static char *silc_server_create_identifier(void)
593 char *username = NULL, *realname = NULL;
594 char hostname[256], email[256];
597 realname = silc_get_real_name();
600 memset(hostname, 0, sizeof(hostname));
601 gethostname(hostname, sizeof(hostname));
603 /* Get username (mandatory) */
604 username = silc_get_username();
608 /* Create default email address, whether it is right or not */
609 snprintf(email, sizeof(email), "%s@%s", username, hostname);
611 return silc_pkcs_encode_identifier(username, hostname, realname, email,
615 /* Creates new public key and private key pair. This is used only
616 when user wants to create new key pair from command line. */
619 silc_server_create_key_pair(char *pkcs_name, int bits, char *path,
621 SilcPublicKey *ret_pub_key,
622 SilcPrivateKey *ret_prv_key)
625 SilcPublicKey pub_key;
626 SilcPrivateKey prv_key;
630 char pkfile[256], prvfile[256];
632 if (!pkcs_name || !path)
635 if (!silc_pkcs_is_supported(pkcs_name)) {
636 fprintf(stderr, "Unsupported PKCS `%s'", pkcs_name);
644 identifier = silc_server_create_identifier();
646 rng = silc_rng_alloc();
648 silc_rng_global_init(rng);
650 snprintf(pkfile, sizeof(pkfile) - 1, "%s%s", path,
651 SILC_SERVER_PUBLIC_KEY_NAME);
652 snprintf(prvfile, sizeof(prvfile) - 1, "%s%s", path,
653 SILC_SERVER_PRIVATE_KEY_NAME);
656 silc_pkcs_alloc(pkcs_name, &pkcs);
657 silc_pkcs_generate_key(pkcs, bits, rng);
659 /* Save public key into file */
660 key = silc_pkcs_get_public_key(pkcs, &key_len);
661 pub_key = silc_pkcs_public_key_alloc(silc_pkcs_get_name(pkcs), identifier,
663 silc_pkcs_save_public_key(pkfile, pub_key, SILC_PKCS_FILE_PEM);
665 *ret_pub_key = pub_key;
667 silc_pkcs_public_key_free(pub_key);
669 memset(key, 0, sizeof(key_len));
672 /* Save private key into file */
673 key = silc_pkcs_get_private_key(pkcs, &key_len);
674 prv_key = silc_pkcs_private_key_alloc(silc_pkcs_get_name(pkcs),
676 silc_pkcs_save_private_key(prvfile, prv_key, NULL, SILC_PKCS_FILE_BIN);
678 *ret_prv_key = prv_key;
680 silc_pkcs_private_key_free(prv_key);
682 printf("Public key has been saved into `%s'\n", pkfile);
683 printf("Private key has been saved into `%s'\n", prvfile);
685 memset(key, 0, sizeof(key_len));
689 silc_pkcs_free(pkcs);