1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* bus.c message bus context object
4 * Copyright (C) 2003, 2004 Red Hat, Inc.
6 * Licensed under the Academic Free License version 2.1
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.
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.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #include "activation.h"
30 #include "connection.h"
34 #include "config-parser.h"
37 #include "dir-watch.h"
38 #include <dbus/dbus-list.h>
39 #include <dbus/dbus-hash.h>
40 #include <dbus/dbus-credentials.h>
41 #include <dbus/dbus-internals.h>
60 BusConnections *connections;
61 BusActivation *activation;
62 BusRegistry *registry;
64 BusMatchmaker *matchmaker;
66 unsigned int fork : 1;
67 unsigned int syslog : 1;
68 unsigned int keep_umask : 1;
69 unsigned int allow_anonymous : 1;
70 unsigned int systemd_activation : 1;
73 static dbus_int32_t server_data_slot = -1;
80 #define BUS_SERVER_DATA(server) (dbus_server_get_data ((server), server_data_slot))
83 server_get_context (DBusServer *server)
88 if (!dbus_server_allocate_data_slot (&server_data_slot))
91 bd = BUS_SERVER_DATA (server);
94 dbus_server_free_data_slot (&server_data_slot);
98 context = bd->context;
100 dbus_server_free_data_slot (&server_data_slot);
106 add_server_watch (DBusWatch *watch,
109 DBusServer *server = data;
112 context = server_get_context (server);
114 return _dbus_loop_add_watch (context->loop, watch);
118 remove_server_watch (DBusWatch *watch,
121 DBusServer *server = data;
124 context = server_get_context (server);
126 _dbus_loop_remove_watch (context->loop, watch);
130 toggle_server_watch (DBusWatch *watch,
133 DBusServer *server = data;
136 context = server_get_context (server);
138 _dbus_loop_toggle_watch (context->loop, watch);
142 add_server_timeout (DBusTimeout *timeout,
145 DBusServer *server = data;
148 context = server_get_context (server);
150 return _dbus_loop_add_timeout (context->loop, timeout);
154 remove_server_timeout (DBusTimeout *timeout,
157 DBusServer *server = data;
160 context = server_get_context (server);
162 _dbus_loop_remove_timeout (context->loop, timeout);
166 new_connection_callback (DBusServer *server,
167 DBusConnection *new_connection,
170 BusContext *context = data;
172 if (!bus_connections_setup_connection (context->connections, new_connection))
174 _dbus_verbose ("No memory to setup new connection\n");
176 /* if we don't do this, it will get unref'd without
177 * being disconnected... kind of strange really
178 * that we have to do this, people won't get it right
181 dbus_connection_close (new_connection);
184 dbus_connection_set_max_received_size (new_connection,
185 context->limits.max_incoming_bytes);
187 dbus_connection_set_max_message_size (new_connection,
188 context->limits.max_message_size);
190 dbus_connection_set_max_received_unix_fds (new_connection,
191 context->limits.max_incoming_unix_fds);
193 dbus_connection_set_max_message_unix_fds (new_connection,
194 context->limits.max_message_unix_fds);
196 dbus_connection_set_allow_anonymous (new_connection,
197 context->allow_anonymous);
199 /* on OOM, we won't have ref'd the connection so it will die. */
203 free_server_data (void *data)
205 BusServerData *bd = data;
211 setup_server (BusContext *context,
213 char **auth_mechanisms,
218 bd = dbus_new0 (BusServerData, 1);
219 if (bd == NULL || !dbus_server_set_data (server,
221 bd, free_server_data))
228 bd->context = context;
230 if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms))
236 dbus_server_set_new_connection_function (server,
237 new_connection_callback,
240 if (!dbus_server_set_watch_functions (server,
251 if (!dbus_server_set_timeout_functions (server,
253 remove_server_timeout,
264 /* This code only gets executed the first time the
265 * config files are parsed. It is not executed
266 * when config files are reloaded.
269 process_config_first_time_only (BusContext *context,
270 BusConfigParser *parser,
271 const DBusString *address,
272 dbus_bool_t systemd_activation,
275 DBusString log_prefix;
277 DBusList **addresses;
278 const char *user, *pidfile;
279 char **auth_mechanisms;
280 DBusList **auth_mechanisms_list;
284 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
287 auth_mechanisms = NULL;
289 _dbus_init_system_log ();
291 context->systemd_activation = systemd_activation;
293 /* Check for an existing pid file. Of course this is a race;
294 * we'd have to use fcntl() locks on the pid file to
295 * avoid that. But we want to check for the pid file
296 * before overwriting any existing sockets, etc.
298 pidfile = bus_config_parser_get_pidfile (parser);
304 _dbus_string_init_const (&u, pidfile);
306 if (_dbus_stat (&u, &stbuf, NULL))
312 _dbus_string_init (&p);
313 _dbus_file_get_contents(&p, &u, NULL);
314 _dbus_string_parse_int(&p, 0, &pid, NULL);
315 _dbus_string_free(&p);
317 if ((kill((int)pid, 0))) {
318 dbus_set_error(NULL, DBUS_ERROR_FILE_EXISTS,
319 "pid %ld not running, removing stale pid file\n",
321 _dbus_delete_file(&u, NULL);
324 dbus_set_error (error, DBUS_ERROR_FAILED,
325 "The pid file \"%s\" exists, if the message bus is not running, remove this file",
334 /* keep around the pid filename so we can delete it later */
335 context->pidfile = _dbus_strdup (pidfile);
337 /* note that type may be NULL */
338 context->type = _dbus_strdup (bus_config_parser_get_type (parser));
339 if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
342 user = bus_config_parser_get_user (parser);
345 context->user = _dbus_strdup (user);
346 if (context->user == NULL)
350 /* Set up the prefix for syslog messages */
351 if (!_dbus_string_init (&log_prefix))
353 if (context->type && !strcmp (context->type, "system"))
355 if (!_dbus_string_append (&log_prefix, "[system] "))
358 else if (context->type && !strcmp (context->type, "session"))
360 DBusCredentials *credentials;
362 credentials = _dbus_credentials_new_from_current_process ();
365 if (!_dbus_string_append (&log_prefix, "[session "))
367 _dbus_credentials_unref (credentials);
370 if (!_dbus_credentials_to_string_append (credentials, &log_prefix))
372 _dbus_credentials_unref (credentials);
375 if (!_dbus_string_append (&log_prefix, "] "))
377 _dbus_credentials_unref (credentials);
380 _dbus_credentials_unref (credentials);
382 if (!_dbus_string_steal_data (&log_prefix, &context->log_prefix))
384 _dbus_string_free (&log_prefix);
386 /* Build an array of auth mechanisms */
388 auth_mechanisms_list = bus_config_parser_get_mechanisms (parser);
389 len = _dbus_list_get_length (auth_mechanisms_list);
395 auth_mechanisms = dbus_new0 (char*, len + 1);
396 if (auth_mechanisms == NULL)
400 link = _dbus_list_get_first_link (auth_mechanisms_list);
403 auth_mechanisms[i] = _dbus_strdup (link->data);
404 if (auth_mechanisms[i] == NULL)
406 link = _dbus_list_get_next_link (auth_mechanisms_list, link);
412 auth_mechanisms = NULL;
415 /* Listen on our addresses */
421 server = dbus_server_listen (_dbus_string_get_const_data(address), error);
424 _DBUS_ASSERT_ERROR_IS_SET (error);
427 else if (!setup_server (context, server, auth_mechanisms, error))
429 _DBUS_ASSERT_ERROR_IS_SET (error);
433 if (!_dbus_list_append (&context->servers, server))
438 addresses = bus_config_parser_get_addresses (parser);
440 link = _dbus_list_get_first_link (addresses);
445 server = dbus_server_listen (link->data, error);
448 _DBUS_ASSERT_ERROR_IS_SET (error);
451 else if (!setup_server (context, server, auth_mechanisms, error))
453 _DBUS_ASSERT_ERROR_IS_SET (error);
457 if (!_dbus_list_append (&context->servers, server))
460 link = _dbus_list_get_next_link (addresses, link);
464 context->fork = bus_config_parser_get_fork (parser);
465 context->syslog = bus_config_parser_get_syslog (parser);
466 context->keep_umask = bus_config_parser_get_keep_umask (parser);
467 context->allow_anonymous = bus_config_parser_get_allow_anonymous (parser);
469 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
473 dbus_free_string_array (auth_mechanisms);
478 dbus_free_string_array (auth_mechanisms);
482 /* This code gets executed every time the config files
483 * are parsed: both during BusContext construction
484 * and on reloads. This function is slightly screwy
485 * since it can do a "half reload" in out-of-memory
486 * situations. Realistically, unlikely to ever matter.
489 process_config_every_time (BusContext *context,
490 BusConfigParser *parser,
491 dbus_bool_t is_reload,
494 DBusString full_address;
498 const char *servicehelper;
503 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
508 if (!_dbus_string_init (&full_address))
514 /* get our limits and timeout lengths */
515 bus_config_parser_get_limits (parser, &context->limits);
518 bus_policy_unref (context->policy);
519 context->policy = bus_config_parser_steal_policy (parser);
520 _dbus_assert (context->policy != NULL);
522 /* We have to build the address backward, so that
523 * <listen> later in the config file have priority
525 link = _dbus_list_get_last_link (&context->servers);
528 addr = dbus_server_get_address (link->data);
535 if (_dbus_string_get_length (&full_address) > 0)
537 if (!_dbus_string_append (&full_address, ";"))
544 if (!_dbus_string_append (&full_address, addr))
553 link = _dbus_list_get_prev_link (&context->servers, link);
557 dbus_free (context->address);
559 if (!_dbus_string_copy_data (&full_address, &context->address))
565 /* get the service directories */
566 dirs = bus_config_parser_get_service_dirs (parser);
568 /* and the service helper */
569 servicehelper = bus_config_parser_get_servicehelper (parser);
571 s = _dbus_strdup(servicehelper);
572 if (s == NULL && servicehelper != NULL)
579 dbus_free(context->servicehelper);
580 context->servicehelper = s;
583 /* Create activation subsystem */
584 if (context->activation)
586 if (!bus_activation_reload (context->activation, &full_address, dirs, error))
591 context->activation = bus_activation_new (context, &full_address, dirs, error);
594 if (context->activation == NULL)
596 _DBUS_ASSERT_ERROR_IS_SET (error);
600 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
604 _dbus_string_free (&full_address);
613 list_concat_new (DBusList **a,
621 for (link = _dbus_list_get_first_link (a); link; link = _dbus_list_get_next_link (a, link))
623 if (!_dbus_list_append (result, link->data))
626 for (link = _dbus_list_get_first_link (b); link; link = _dbus_list_get_next_link (b, link))
628 if (!_dbus_list_append (result, link->data))
634 _dbus_list_clear (result);
639 raise_file_descriptor_limit (BusContext *context)
642 /* I just picked this out of thin air; we need some extra
643 * descriptors for things like any internal pipes we create,
644 * inotify, connections to SELinux, etc.
646 unsigned int arbitrary_extra_fds = 32;
649 limit = context->limits.max_completed_connections +
650 context->limits.max_incomplete_connections
651 + arbitrary_extra_fds;
653 _dbus_request_file_descriptor_limit (limit);
657 process_config_postinit (BusContext *context,
658 BusConfigParser *parser,
661 DBusHashTable *service_context_table;
662 DBusList *watched_dirs = NULL;
664 raise_file_descriptor_limit (context);
666 service_context_table = bus_config_parser_steal_service_context_table (parser);
667 if (!bus_registry_set_service_context_table (context->registry,
668 service_context_table))
674 _dbus_hash_table_unref (service_context_table);
676 /* We need to monitor both the configuration directories and directories
677 * containing .service files.
679 if (!list_concat_new (bus_config_parser_get_conf_dirs (parser),
680 bus_config_parser_get_service_dirs (parser),
687 bus_set_watched_dirs (context, &watched_dirs);
689 _dbus_list_clear (&watched_dirs);
695 bus_context_new (const DBusString *config_file,
696 ForceForkSetting force_fork,
697 DBusPipe *print_addr_pipe,
698 DBusPipe *print_pid_pipe,
699 const DBusString *address,
700 dbus_bool_t systemd_activation,
704 BusConfigParser *parser;
706 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
711 if (!dbus_server_allocate_data_slot (&server_data_slot))
717 context = dbus_new0 (BusContext, 1);
723 context->refcount = 1;
725 _dbus_generate_uuid (&context->uuid);
727 if (!_dbus_string_copy_data (config_file, &context->config_file))
733 context->loop = _dbus_loop_new ();
734 if (context->loop == NULL)
740 context->registry = bus_registry_new (context);
741 if (context->registry == NULL)
747 parser = bus_config_load (config_file, TRUE, NULL, error);
750 _DBUS_ASSERT_ERROR_IS_SET (error);
754 if (!process_config_first_time_only (context, parser, address, systemd_activation, error))
756 _DBUS_ASSERT_ERROR_IS_SET (error);
759 if (!process_config_every_time (context, parser, FALSE, error))
761 _DBUS_ASSERT_ERROR_IS_SET (error);
765 /* we need another ref of the server data slot for the context
768 if (!dbus_server_allocate_data_slot (&server_data_slot))
769 _dbus_assert_not_reached ("second ref of server data slot failed");
771 /* Note that we don't know whether the print_addr_pipe is
772 * one of the sockets we're using to listen on, or some
773 * other random thing. But I think the answer is "don't do
776 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
779 const char *a = bus_context_get_address (context);
782 _dbus_assert (a != NULL);
783 if (!_dbus_string_init (&addr))
789 if (!_dbus_string_append (&addr, a) ||
790 !_dbus_string_append (&addr, "\n"))
792 _dbus_string_free (&addr);
797 bytes = _dbus_string_get_length (&addr);
798 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
800 /* pipe write returns an error on failure but not short write */
801 if (error != NULL && !dbus_error_is_set (error))
803 dbus_set_error (error, DBUS_ERROR_FAILED,
804 "Printing message bus address: did not write all bytes\n");
806 _dbus_string_free (&addr);
810 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
811 _dbus_pipe_close (print_addr_pipe, NULL);
813 _dbus_string_free (&addr);
816 context->connections = bus_connections_new (context);
817 if (context->connections == NULL)
823 context->matchmaker = bus_matchmaker_new ();
824 if (context->matchmaker == NULL)
830 /* check user before we fork */
831 if (context->user != NULL)
833 if (!_dbus_verify_daemon_user (context->user))
835 dbus_set_error (error, DBUS_ERROR_FAILED,
836 "Could not get UID and GID for username \"%s\"",
842 /* Now become a daemon if appropriate and write out pid file in any case */
846 if (context->pidfile)
847 _dbus_string_init_const (&u, context->pidfile);
849 if ((force_fork != FORK_NEVER && context->fork) || force_fork == FORK_ALWAYS)
851 _dbus_verbose ("Forking and becoming daemon\n");
853 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
856 context->keep_umask))
858 _DBUS_ASSERT_ERROR_IS_SET (error);
864 _dbus_verbose ("Fork not requested\n");
866 /* Need to write PID file and to PID pipe for ourselves,
867 * not for the child process. This is a no-op if the pidfile
868 * is NULL and print_pid_pipe is NULL.
870 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
875 _DBUS_ASSERT_ERROR_IS_SET (error);
881 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
882 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
883 _dbus_pipe_close (print_pid_pipe, NULL);
885 if (!bus_selinux_full_init ())
887 bus_context_log (context, DBUS_SYSTEM_LOG_FATAL, "SELinux enabled but AVC initialization failed; check system log\n");
890 if (!process_config_postinit (context, parser, error))
892 _DBUS_ASSERT_ERROR_IS_SET (error);
898 bus_config_parser_unref (parser);
902 /* Here we change our credentials if required,
903 * as soon as we've set up our sockets and pidfile
905 if (context->user != NULL)
907 if (!_dbus_change_to_daemon_user (context->user, error))
909 _DBUS_ASSERT_ERROR_IS_SET (error);
914 /* FIXME - why not just put this in full_init() below? */
915 bus_selinux_audit_init ();
919 dbus_server_free_data_slot (&server_data_slot);
925 bus_config_parser_unref (parser);
927 bus_context_unref (context);
929 if (server_data_slot >= 0)
930 dbus_server_free_data_slot (&server_data_slot);
936 bus_context_get_id (BusContext *context,
939 return _dbus_uuid_encode (&context->uuid, uuid);
943 bus_context_reload_config (BusContext *context,
946 BusConfigParser *parser;
947 DBusString config_file;
950 /* Flush the user database cache */
951 _dbus_flush_caches ();
954 _dbus_string_init_const (&config_file, context->config_file);
955 parser = bus_config_load (&config_file, TRUE, NULL, error);
958 _DBUS_ASSERT_ERROR_IS_SET (error);
962 if (!process_config_every_time (context, parser, TRUE, error))
964 _DBUS_ASSERT_ERROR_IS_SET (error);
967 if (!process_config_postinit (context, parser, error))
969 _DBUS_ASSERT_ERROR_IS_SET (error);
974 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
977 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
979 bus_config_parser_unref (parser);
984 shutdown_server (BusContext *context,
987 if (server == NULL ||
988 !dbus_server_get_is_connected (server))
991 if (!dbus_server_set_watch_functions (server,
995 _dbus_assert_not_reached ("setting watch functions to NULL failed");
997 if (!dbus_server_set_timeout_functions (server,
1001 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
1003 dbus_server_disconnect (server);
1007 bus_context_shutdown (BusContext *context)
1011 link = _dbus_list_get_first_link (&context->servers);
1012 while (link != NULL)
1014 shutdown_server (context, link->data);
1016 link = _dbus_list_get_next_link (&context->servers, link);
1021 bus_context_ref (BusContext *context)
1023 _dbus_assert (context->refcount > 0);
1024 context->refcount += 1;
1030 bus_context_unref (BusContext *context)
1032 _dbus_assert (context->refcount > 0);
1033 context->refcount -= 1;
1035 if (context->refcount == 0)
1039 _dbus_verbose ("Finalizing bus context %p\n", context);
1041 bus_context_shutdown (context);
1043 if (context->connections)
1045 bus_connections_unref (context->connections);
1046 context->connections = NULL;
1049 if (context->registry)
1051 bus_registry_unref (context->registry);
1052 context->registry = NULL;
1055 if (context->activation)
1057 bus_activation_unref (context->activation);
1058 context->activation = NULL;
1061 link = _dbus_list_get_first_link (&context->servers);
1062 while (link != NULL)
1064 dbus_server_unref (link->data);
1066 link = _dbus_list_get_next_link (&context->servers, link);
1068 _dbus_list_clear (&context->servers);
1070 if (context->policy)
1072 bus_policy_unref (context->policy);
1073 context->policy = NULL;
1078 _dbus_loop_unref (context->loop);
1079 context->loop = NULL;
1082 if (context->matchmaker)
1084 bus_matchmaker_unref (context->matchmaker);
1085 context->matchmaker = NULL;
1088 dbus_free (context->config_file);
1089 dbus_free (context->log_prefix);
1090 dbus_free (context->type);
1091 dbus_free (context->address);
1092 dbus_free (context->user);
1093 dbus_free (context->servicehelper);
1095 if (context->pidfile)
1098 _dbus_string_init_const (&u, context->pidfile);
1100 /* Deliberately ignore errors here, since there's not much
1101 * we can do about it, and we're exiting anyways.
1103 _dbus_delete_file (&u, NULL);
1105 dbus_free (context->pidfile);
1107 dbus_free (context);
1109 dbus_server_free_data_slot (&server_data_slot);
1113 /* type may be NULL */
1115 bus_context_get_type (BusContext *context)
1117 return context->type;
1121 bus_context_get_address (BusContext *context)
1123 return context->address;
1127 bus_context_get_servicehelper (BusContext *context)
1129 return context->servicehelper;
1133 bus_context_get_systemd_activation (BusContext *context)
1135 return context->systemd_activation;
1139 bus_context_get_registry (BusContext *context)
1141 return context->registry;
1145 bus_context_get_connections (BusContext *context)
1147 return context->connections;
1151 bus_context_get_activation (BusContext *context)
1153 return context->activation;
1157 bus_context_get_matchmaker (BusContext *context)
1159 return context->matchmaker;
1163 bus_context_get_loop (BusContext *context)
1165 return context->loop;
1169 bus_context_allow_unix_user (BusContext *context,
1172 return bus_policy_allow_unix_user (context->policy,
1176 /* For now this is never actually called because the default
1177 * DBusConnection behavior of 'same user that owns the bus can connect'
1178 * is all it would do.
1181 bus_context_allow_windows_user (BusContext *context,
1182 const char *windows_sid)
1184 return bus_policy_allow_windows_user (context->policy,
1189 bus_context_get_policy (BusContext *context)
1191 return context->policy;
1195 bus_context_create_client_policy (BusContext *context,
1196 DBusConnection *connection,
1199 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1200 return bus_policy_create_client_policy (context->policy, connection,
1205 bus_context_get_activation_timeout (BusContext *context)
1208 return context->limits.activation_timeout;
1212 bus_context_get_auth_timeout (BusContext *context)
1214 return context->limits.auth_timeout;
1218 bus_context_get_max_completed_connections (BusContext *context)
1220 return context->limits.max_completed_connections;
1224 bus_context_get_max_incomplete_connections (BusContext *context)
1226 return context->limits.max_incomplete_connections;
1230 bus_context_get_max_connections_per_user (BusContext *context)
1232 return context->limits.max_connections_per_user;
1236 bus_context_get_max_pending_activations (BusContext *context)
1238 return context->limits.max_pending_activations;
1242 bus_context_get_max_services_per_connection (BusContext *context)
1244 return context->limits.max_services_per_connection;
1248 bus_context_get_max_match_rules_per_connection (BusContext *context)
1250 return context->limits.max_match_rules_per_connection;
1254 bus_context_get_max_replies_per_connection (BusContext *context)
1256 return context->limits.max_replies_per_connection;
1260 bus_context_get_reply_timeout (BusContext *context)
1262 return context->limits.reply_timeout;
1266 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...) _DBUS_GNUC_PRINTF (3, 4);
1269 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1273 if (!context->syslog)
1275 /* we're not syslogging; just output to stderr */
1276 va_start (args, msg);
1277 vfprintf (stderr, msg, args);
1278 fprintf (stderr, "\n");
1283 va_start (args, msg);
1285 if (context->log_prefix)
1287 DBusString full_msg;
1289 if (!_dbus_string_init (&full_msg))
1291 if (!_dbus_string_append (&full_msg, context->log_prefix))
1293 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1296 _dbus_system_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1298 _dbus_string_free (&full_msg);
1301 _dbus_system_logv (severity, msg, args);
1307 static inline const char *
1308 nonnull (const char *maybe_null,
1309 const char *if_null)
1311 return (maybe_null ? maybe_null : if_null);
1315 * Log something about a message, usually that it was rejected.
1318 complain_about_message (BusContext *context,
1319 const char *error_name,
1320 const char *complaint,
1322 DBusMessage *message,
1323 DBusConnection *sender,
1324 DBusConnection *proposed_recipient,
1325 dbus_bool_t requested_reply,
1329 DBusError stack_error = DBUS_ERROR_INIT;
1330 const char *sender_name;
1331 const char *sender_loginfo;
1332 const char *proposed_recipient_loginfo;
1334 if (error == NULL && !log)
1339 sender_name = bus_connection_get_name (sender);
1340 sender_loginfo = bus_connection_get_loginfo (sender);
1344 sender_name = "(unset)";
1345 sender_loginfo = "(bus)";
1348 if (proposed_recipient != NULL)
1349 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1351 proposed_recipient_loginfo = "bus";
1353 dbus_set_error (&stack_error, error_name,
1354 "%s, %d matched rules; type=\"%s\", sender=\"%s\" (%s) "
1355 "interface=\"%s\" member=\"%s\" error name=\"%s\" "
1356 "requested_reply=\"%d\" destination=\"%s\" (%s)",
1359 dbus_message_type_to_string (dbus_message_get_type (message)),
1362 nonnull (dbus_message_get_interface (message), "(unset)"),
1363 nonnull (dbus_message_get_member (message), "(unset)"),
1364 nonnull (dbus_message_get_error_name (message), "(unset)"),
1366 nonnull (dbus_message_get_destination (message), DBUS_SERVICE_DBUS),
1367 proposed_recipient_loginfo);
1369 /* If we hit OOM while setting the error, this will syslog "out of memory"
1370 * which is itself an indication that something is seriously wrong */
1372 bus_context_log (context, DBUS_SYSTEM_LOG_SECURITY, "%s",
1373 stack_error.message);
1375 dbus_move_error (&stack_error, error);
1379 * addressed_recipient is the recipient specified in the message.
1381 * proposed_recipient is the recipient we're considering sending
1382 * to right this second, and may be an eavesdropper.
1384 * sender is the sender of the message.
1386 * NULL for proposed_recipient or sender definitely means the bus driver.
1388 * NULL for addressed_recipient may mean the bus driver, or may mean
1389 * no destination was specified in the message (e.g. a signal).
1392 bus_context_check_security_policy (BusContext *context,
1393 BusTransaction *transaction,
1394 DBusConnection *sender,
1395 DBusConnection *addressed_recipient,
1396 DBusConnection *proposed_recipient,
1397 DBusMessage *message,
1401 BusClientPolicy *sender_policy;
1402 BusClientPolicy *recipient_policy;
1403 dbus_int32_t toggles;
1406 dbus_bool_t requested_reply;
1408 type = dbus_message_get_type (message);
1409 dest = dbus_message_get_destination (message);
1411 /* dispatch.c was supposed to ensure these invariants */
1412 _dbus_assert (dest != NULL ||
1413 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1414 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1415 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1416 addressed_recipient != NULL ||
1417 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1421 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1422 case DBUS_MESSAGE_TYPE_SIGNAL:
1423 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1424 case DBUS_MESSAGE_TYPE_ERROR:
1428 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1431 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1432 "Message bus will not accept messages of unknown type\n");
1437 requested_reply = FALSE;
1441 /* First verify the SELinux access controls. If allowed then
1442 * go on with the standard checks.
1444 if (!bus_selinux_allows_send (sender, proposed_recipient,
1445 dbus_message_type_to_string (dbus_message_get_type (message)),
1446 dbus_message_get_interface (message),
1447 dbus_message_get_member (message),
1448 dbus_message_get_error_name (message),
1449 dest ? dest : DBUS_SERVICE_DBUS, error))
1451 if (error != NULL && !dbus_error_is_set (error))
1453 /* don't syslog this, just set the error: avc_has_perm should
1454 * have already written to either the audit log or syslog */
1455 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1456 "An SELinux policy prevents this sender from sending this "
1457 "message to this recipient",
1458 0, message, sender, proposed_recipient, FALSE, FALSE, error);
1459 _dbus_verbose ("SELinux security check denying send to service\n");
1465 if (bus_connection_is_active (sender))
1467 sender_policy = bus_connection_get_policy (sender);
1468 _dbus_assert (sender_policy != NULL);
1470 /* Fill in requested_reply variable with TRUE if this is a
1471 * reply and the reply was pending.
1473 if (dbus_message_get_reply_serial (message) != 0)
1475 if (proposed_recipient != NULL /* not to the bus driver */ &&
1476 addressed_recipient == proposed_recipient /* not eavesdropping */)
1480 dbus_error_init (&error2);
1481 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1483 sender, addressed_recipient, message,
1485 if (dbus_error_is_set (&error2))
1487 dbus_move_error (&error2, error);
1495 /* Policy for inactive connections is that they can only send
1496 * the hello message to the bus driver
1498 if (proposed_recipient == NULL &&
1499 dbus_message_is_method_call (message,
1500 DBUS_INTERFACE_DBUS,
1503 _dbus_verbose ("security check allowing %s message\n",
1509 _dbus_verbose ("security check disallowing non-%s message\n",
1512 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1513 "Client tried to send a message other than %s without being registered",
1522 sender_policy = NULL;
1524 /* If the sender is the bus driver, we assume any reply was a
1525 * requested reply as bus driver won't send bogus ones
1527 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1528 dbus_message_get_reply_serial (message) != 0)
1529 requested_reply = TRUE;
1532 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1533 (sender == NULL && sender_policy == NULL));
1535 if (proposed_recipient != NULL)
1537 /* only the bus driver can send to an inactive recipient (as it
1538 * owns no services, so other apps can't address it). Inactive
1539 * recipients can receive any message.
1541 if (bus_connection_is_active (proposed_recipient))
1543 recipient_policy = bus_connection_get_policy (proposed_recipient);
1544 _dbus_assert (recipient_policy != NULL);
1546 else if (sender == NULL)
1548 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1549 recipient_policy = NULL;
1553 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus\n");
1554 recipient_policy = NULL;
1558 recipient_policy = NULL;
1560 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1561 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1562 (proposed_recipient == NULL && recipient_policy == NULL));
1565 if (sender_policy &&
1566 !bus_client_policy_check_can_send (sender_policy,
1570 message, &toggles, &log))
1572 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1573 "Rejected send message", toggles,
1574 message, sender, proposed_recipient, requested_reply,
1575 (addressed_recipient == proposed_recipient), error);
1576 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1582 /* We want to drop this message, and are only not doing so for backwards
1584 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1585 "Would reject message", toggles,
1586 message, sender, proposed_recipient, requested_reply,
1590 if (recipient_policy &&
1591 !bus_client_policy_check_can_receive (recipient_policy,
1595 addressed_recipient, proposed_recipient,
1598 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1599 "Rejected receive message", toggles,
1600 message, sender, proposed_recipient, requested_reply,
1601 (addressed_recipient == proposed_recipient), NULL);
1602 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1606 /* See if limits on size have been exceeded */
1607 if (proposed_recipient &&
1608 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1609 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1611 complain_about_message (context, DBUS_ERROR_LIMITS_EXCEEDED,
1612 "Rejected: destination has a full message queue",
1613 0, message, sender, proposed_recipient, requested_reply, TRUE,
1615 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1619 /* Record that we will allow a reply here in the future (don't
1620 * bother if the recipient is the bus or this is an eavesdropping
1621 * connection). Only the addressed recipient may reply.
1623 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1625 addressed_recipient &&
1626 addressed_recipient == proposed_recipient && /* not eavesdropping */
1627 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1629 sender, addressed_recipient,
1632 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1636 _dbus_verbose ("security policy allowing message\n");