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 BusContextFlags flags,
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;
290 _dbus_init_system_log (TRUE);
292 if (flags & BUS_CONTEXT_FLAG_SYSTEMD_ACTIVATION)
293 context->systemd_activation = TRUE;
295 context->systemd_activation = FALSE;
297 /* Check for an existing pid file. Of course this is a race;
298 * we'd have to use fcntl() locks on the pid file to
299 * avoid that. But we want to check for the pid file
300 * before overwriting any existing sockets, etc.
303 if (flags & BUS_CONTEXT_FLAG_WRITE_PID_FILE)
304 pidfile = bus_config_parser_get_pidfile (parser);
311 _dbus_string_init_const (&u, pidfile);
313 if (_dbus_stat (&u, &stbuf, NULL))
319 _dbus_string_init (&p);
320 _dbus_file_get_contents(&p, &u, NULL);
321 _dbus_string_parse_int(&p, 0, &pid, NULL);
322 _dbus_string_free(&p);
324 if ((kill((int)pid, 0))) {
325 dbus_set_error(NULL, DBUS_ERROR_FILE_EXISTS,
326 "pid %ld not running, removing stale pid file\n",
328 _dbus_delete_file(&u, NULL);
331 dbus_set_error (error, DBUS_ERROR_FAILED,
332 "The pid file \"%s\" exists, if the message bus is not running, remove this file",
341 /* keep around the pid filename so we can delete it later */
342 context->pidfile = _dbus_strdup (pidfile);
344 /* note that type may be NULL */
345 context->type = _dbus_strdup (bus_config_parser_get_type (parser));
346 if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
349 user = bus_config_parser_get_user (parser);
352 context->user = _dbus_strdup (user);
353 if (context->user == NULL)
357 /* Set up the prefix for syslog messages */
358 if (!_dbus_string_init (&log_prefix))
360 if (context->type && !strcmp (context->type, "system"))
362 if (!_dbus_string_append (&log_prefix, "[system] "))
365 else if (context->type && !strcmp (context->type, "session"))
367 DBusCredentials *credentials;
369 credentials = _dbus_credentials_new_from_current_process ();
372 if (!_dbus_string_append (&log_prefix, "[session "))
374 _dbus_credentials_unref (credentials);
377 if (!_dbus_credentials_to_string_append (credentials, &log_prefix))
379 _dbus_credentials_unref (credentials);
382 if (!_dbus_string_append (&log_prefix, "] "))
384 _dbus_credentials_unref (credentials);
387 _dbus_credentials_unref (credentials);
389 if (!_dbus_string_steal_data (&log_prefix, &context->log_prefix))
391 _dbus_string_free (&log_prefix);
393 /* Build an array of auth mechanisms */
395 auth_mechanisms_list = bus_config_parser_get_mechanisms (parser);
396 len = _dbus_list_get_length (auth_mechanisms_list);
402 auth_mechanisms = dbus_new0 (char*, len + 1);
403 if (auth_mechanisms == NULL)
407 link = _dbus_list_get_first_link (auth_mechanisms_list);
410 auth_mechanisms[i] = _dbus_strdup (link->data);
411 if (auth_mechanisms[i] == NULL)
413 link = _dbus_list_get_next_link (auth_mechanisms_list, link);
419 auth_mechanisms = NULL;
422 /* Listen on our addresses */
428 server = dbus_server_listen (_dbus_string_get_const_data(address), error);
431 _DBUS_ASSERT_ERROR_IS_SET (error);
434 else if (!setup_server (context, server, auth_mechanisms, error))
436 _DBUS_ASSERT_ERROR_IS_SET (error);
440 if (!_dbus_list_append (&context->servers, server))
445 addresses = bus_config_parser_get_addresses (parser);
447 link = _dbus_list_get_first_link (addresses);
452 server = dbus_server_listen (link->data, error);
455 _DBUS_ASSERT_ERROR_IS_SET (error);
458 else if (!setup_server (context, server, auth_mechanisms, error))
460 _DBUS_ASSERT_ERROR_IS_SET (error);
464 if (!_dbus_list_append (&context->servers, server))
467 link = _dbus_list_get_next_link (addresses, link);
471 context->fork = bus_config_parser_get_fork (parser);
472 context->syslog = bus_config_parser_get_syslog (parser);
473 context->keep_umask = bus_config_parser_get_keep_umask (parser);
474 context->allow_anonymous = bus_config_parser_get_allow_anonymous (parser);
476 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
480 dbus_free_string_array (auth_mechanisms);
485 dbus_free_string_array (auth_mechanisms);
489 /* This code gets executed every time the config files
490 * are parsed: both during BusContext construction
491 * and on reloads. This function is slightly screwy
492 * since it can do a "half reload" in out-of-memory
493 * situations. Realistically, unlikely to ever matter.
496 process_config_every_time (BusContext *context,
497 BusConfigParser *parser,
498 dbus_bool_t is_reload,
501 DBusString full_address;
505 const char *servicehelper;
510 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
515 if (!_dbus_string_init (&full_address))
521 /* get our limits and timeout lengths */
522 bus_config_parser_get_limits (parser, &context->limits);
525 bus_policy_unref (context->policy);
526 context->policy = bus_config_parser_steal_policy (parser);
527 _dbus_assert (context->policy != NULL);
529 /* context->connections is NULL when creating new BusContext */
530 if (context->connections)
532 _dbus_verbose ("Reload policy rules for completed connections\n");
533 retval = bus_connections_reload_policy (context->connections, error);
536 _DBUS_ASSERT_ERROR_IS_SET (error);
541 /* We have to build the address backward, so that
542 * <listen> later in the config file have priority
544 link = _dbus_list_get_last_link (&context->servers);
547 addr = dbus_server_get_address (link->data);
554 if (_dbus_string_get_length (&full_address) > 0)
556 if (!_dbus_string_append (&full_address, ";"))
563 if (!_dbus_string_append (&full_address, addr))
572 link = _dbus_list_get_prev_link (&context->servers, link);
576 dbus_free (context->address);
578 if (!_dbus_string_copy_data (&full_address, &context->address))
584 /* get the service directories */
585 dirs = bus_config_parser_get_service_dirs (parser);
587 /* and the service helper */
588 servicehelper = bus_config_parser_get_servicehelper (parser);
590 s = _dbus_strdup(servicehelper);
591 if (s == NULL && servicehelper != NULL)
598 dbus_free(context->servicehelper);
599 context->servicehelper = s;
602 /* Create activation subsystem */
603 if (context->activation)
605 if (!bus_activation_reload (context->activation, &full_address, dirs, error))
610 context->activation = bus_activation_new (context, &full_address, dirs, error);
613 if (context->activation == NULL)
615 _DBUS_ASSERT_ERROR_IS_SET (error);
619 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
623 _dbus_string_free (&full_address);
632 list_concat_new (DBusList **a,
640 for (link = _dbus_list_get_first_link (a); link; link = _dbus_list_get_next_link (a, link))
642 if (!_dbus_list_append (result, link->data))
645 for (link = _dbus_list_get_first_link (b); link; link = _dbus_list_get_next_link (b, link))
647 if (!_dbus_list_append (result, link->data))
653 _dbus_list_clear (result);
658 raise_file_descriptor_limit (BusContext *context)
661 /* I just picked this out of thin air; we need some extra
662 * descriptors for things like any internal pipes we create,
663 * inotify, connections to SELinux, etc.
665 unsigned int arbitrary_extra_fds = 32;
668 limit = context->limits.max_completed_connections +
669 context->limits.max_incomplete_connections
670 + arbitrary_extra_fds;
672 _dbus_request_file_descriptor_limit (limit);
676 process_config_postinit (BusContext *context,
677 BusConfigParser *parser,
680 DBusHashTable *service_context_table;
681 DBusList *watched_dirs = NULL;
683 raise_file_descriptor_limit (context);
685 service_context_table = bus_config_parser_steal_service_context_table (parser);
686 if (!bus_registry_set_service_context_table (context->registry,
687 service_context_table))
693 _dbus_hash_table_unref (service_context_table);
695 /* We need to monitor both the configuration directories and directories
696 * containing .service files.
698 if (!list_concat_new (bus_config_parser_get_conf_dirs (parser),
699 bus_config_parser_get_service_dirs (parser),
706 bus_set_watched_dirs (context, &watched_dirs);
708 _dbus_list_clear (&watched_dirs);
714 bus_context_new (const DBusString *config_file,
715 BusContextFlags flags,
716 DBusPipe *print_addr_pipe,
717 DBusPipe *print_pid_pipe,
718 const DBusString *address,
722 BusConfigParser *parser;
724 _dbus_assert ((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 ||
725 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS) == 0);
727 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
732 if (!dbus_server_allocate_data_slot (&server_data_slot))
738 context = dbus_new0 (BusContext, 1);
744 context->refcount = 1;
746 _dbus_generate_uuid (&context->uuid);
748 if (!_dbus_string_copy_data (config_file, &context->config_file))
754 context->loop = _dbus_loop_new ();
755 if (context->loop == NULL)
761 context->registry = bus_registry_new (context);
762 if (context->registry == NULL)
768 parser = bus_config_load (config_file, TRUE, NULL, error);
771 _DBUS_ASSERT_ERROR_IS_SET (error);
775 if (!process_config_first_time_only (context, parser, address, flags, error))
777 _DBUS_ASSERT_ERROR_IS_SET (error);
780 if (!process_config_every_time (context, parser, FALSE, error))
782 _DBUS_ASSERT_ERROR_IS_SET (error);
786 /* we need another ref of the server data slot for the context
789 if (!dbus_server_allocate_data_slot (&server_data_slot))
790 _dbus_assert_not_reached ("second ref of server data slot failed");
792 /* Note that we don't know whether the print_addr_pipe is
793 * one of the sockets we're using to listen on, or some
794 * other random thing. But I think the answer is "don't do
797 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
800 const char *a = bus_context_get_address (context);
803 _dbus_assert (a != NULL);
804 if (!_dbus_string_init (&addr))
810 if (!_dbus_string_append (&addr, a) ||
811 !_dbus_string_append (&addr, "\n"))
813 _dbus_string_free (&addr);
818 bytes = _dbus_string_get_length (&addr);
819 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
821 /* pipe write returns an error on failure but not short write */
822 if (error != NULL && !dbus_error_is_set (error))
824 dbus_set_error (error, DBUS_ERROR_FAILED,
825 "Printing message bus address: did not write all bytes\n");
827 _dbus_string_free (&addr);
831 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
832 _dbus_pipe_close (print_addr_pipe, NULL);
834 _dbus_string_free (&addr);
837 context->connections = bus_connections_new (context);
838 if (context->connections == NULL)
844 context->matchmaker = bus_matchmaker_new ();
845 if (context->matchmaker == NULL)
851 /* check user before we fork */
852 if (context->user != NULL)
854 if (!_dbus_verify_daemon_user (context->user))
856 dbus_set_error (error, DBUS_ERROR_FAILED,
857 "Could not get UID and GID for username \"%s\"",
863 /* Now become a daemon if appropriate and write out pid file in any case */
867 if (context->pidfile)
868 _dbus_string_init_const (&u, context->pidfile);
870 if (((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 && context->fork) ||
871 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS))
873 _dbus_verbose ("Forking and becoming daemon\n");
875 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
878 context->keep_umask))
880 _DBUS_ASSERT_ERROR_IS_SET (error);
886 _dbus_verbose ("Fork not requested\n");
888 /* Need to write PID file and to PID pipe for ourselves,
889 * not for the child process. This is a no-op if the pidfile
890 * is NULL and print_pid_pipe is NULL.
892 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
897 _DBUS_ASSERT_ERROR_IS_SET (error);
903 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
904 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
905 _dbus_pipe_close (print_pid_pipe, NULL);
907 if (!bus_selinux_full_init ())
909 bus_context_log (context, DBUS_SYSTEM_LOG_FATAL, "SELinux enabled but D-Bus initialization failed; check system log\n");
912 if (!process_config_postinit (context, parser, error))
914 _DBUS_ASSERT_ERROR_IS_SET (error);
920 bus_config_parser_unref (parser);
924 /* Here we change our credentials if required,
925 * as soon as we've set up our sockets and pidfile
927 if (context->user != NULL)
929 if (!_dbus_change_to_daemon_user (context->user, error))
931 _DBUS_ASSERT_ERROR_IS_SET (error);
936 /* FIXME - why not just put this in full_init() below? */
937 bus_selinux_audit_init ();
941 dbus_server_free_data_slot (&server_data_slot);
947 bus_config_parser_unref (parser);
949 bus_context_unref (context);
951 if (server_data_slot >= 0)
952 dbus_server_free_data_slot (&server_data_slot);
958 bus_context_get_id (BusContext *context,
961 return _dbus_uuid_encode (&context->uuid, uuid);
965 bus_context_reload_config (BusContext *context,
968 BusConfigParser *parser;
969 DBusString config_file;
972 /* Flush the user database cache */
973 _dbus_flush_caches ();
976 _dbus_string_init_const (&config_file, context->config_file);
977 parser = bus_config_load (&config_file, TRUE, NULL, error);
980 _DBUS_ASSERT_ERROR_IS_SET (error);
984 if (!process_config_every_time (context, parser, TRUE, error))
986 _DBUS_ASSERT_ERROR_IS_SET (error);
989 if (!process_config_postinit (context, parser, error))
991 _DBUS_ASSERT_ERROR_IS_SET (error);
996 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
999 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
1001 bus_config_parser_unref (parser);
1006 shutdown_server (BusContext *context,
1009 if (server == NULL ||
1010 !dbus_server_get_is_connected (server))
1013 if (!dbus_server_set_watch_functions (server,
1017 _dbus_assert_not_reached ("setting watch functions to NULL failed");
1019 if (!dbus_server_set_timeout_functions (server,
1023 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
1025 dbus_server_disconnect (server);
1029 bus_context_shutdown (BusContext *context)
1033 link = _dbus_list_get_first_link (&context->servers);
1034 while (link != NULL)
1036 shutdown_server (context, link->data);
1038 link = _dbus_list_get_next_link (&context->servers, link);
1043 bus_context_ref (BusContext *context)
1045 _dbus_assert (context->refcount > 0);
1046 context->refcount += 1;
1052 bus_context_unref (BusContext *context)
1054 _dbus_assert (context->refcount > 0);
1055 context->refcount -= 1;
1057 if (context->refcount == 0)
1061 _dbus_verbose ("Finalizing bus context %p\n", context);
1063 bus_context_shutdown (context);
1065 if (context->connections)
1067 bus_connections_unref (context->connections);
1068 context->connections = NULL;
1071 if (context->registry)
1073 bus_registry_unref (context->registry);
1074 context->registry = NULL;
1077 if (context->activation)
1079 bus_activation_unref (context->activation);
1080 context->activation = NULL;
1083 link = _dbus_list_get_first_link (&context->servers);
1084 while (link != NULL)
1086 dbus_server_unref (link->data);
1088 link = _dbus_list_get_next_link (&context->servers, link);
1090 _dbus_list_clear (&context->servers);
1092 if (context->policy)
1094 bus_policy_unref (context->policy);
1095 context->policy = NULL;
1100 _dbus_loop_unref (context->loop);
1101 context->loop = NULL;
1104 if (context->matchmaker)
1106 bus_matchmaker_unref (context->matchmaker);
1107 context->matchmaker = NULL;
1110 dbus_free (context->config_file);
1111 dbus_free (context->log_prefix);
1112 dbus_free (context->type);
1113 dbus_free (context->address);
1114 dbus_free (context->user);
1115 dbus_free (context->servicehelper);
1117 if (context->pidfile)
1120 _dbus_string_init_const (&u, context->pidfile);
1122 /* Deliberately ignore errors here, since there's not much
1123 * we can do about it, and we're exiting anyways.
1125 _dbus_delete_file (&u, NULL);
1127 dbus_free (context->pidfile);
1129 dbus_free (context);
1131 dbus_server_free_data_slot (&server_data_slot);
1135 /* type may be NULL */
1137 bus_context_get_type (BusContext *context)
1139 return context->type;
1143 bus_context_get_address (BusContext *context)
1145 return context->address;
1149 bus_context_get_servicehelper (BusContext *context)
1151 return context->servicehelper;
1155 bus_context_get_systemd_activation (BusContext *context)
1157 return context->systemd_activation;
1161 bus_context_get_registry (BusContext *context)
1163 return context->registry;
1167 bus_context_get_connections (BusContext *context)
1169 return context->connections;
1173 bus_context_get_activation (BusContext *context)
1175 return context->activation;
1179 bus_context_get_matchmaker (BusContext *context)
1181 return context->matchmaker;
1185 bus_context_get_loop (BusContext *context)
1187 return context->loop;
1191 bus_context_allow_unix_user (BusContext *context,
1194 return bus_policy_allow_unix_user (context->policy,
1198 /* For now this is never actually called because the default
1199 * DBusConnection behavior of 'same user that owns the bus can connect'
1200 * is all it would do.
1203 bus_context_allow_windows_user (BusContext *context,
1204 const char *windows_sid)
1206 return bus_policy_allow_windows_user (context->policy,
1211 bus_context_get_policy (BusContext *context)
1213 return context->policy;
1217 bus_context_create_client_policy (BusContext *context,
1218 DBusConnection *connection,
1221 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1222 return bus_policy_create_client_policy (context->policy, connection,
1227 bus_context_get_activation_timeout (BusContext *context)
1230 return context->limits.activation_timeout;
1234 bus_context_get_auth_timeout (BusContext *context)
1236 return context->limits.auth_timeout;
1240 bus_context_get_max_completed_connections (BusContext *context)
1242 return context->limits.max_completed_connections;
1246 bus_context_get_max_incomplete_connections (BusContext *context)
1248 return context->limits.max_incomplete_connections;
1252 bus_context_get_max_connections_per_user (BusContext *context)
1254 return context->limits.max_connections_per_user;
1258 bus_context_get_max_pending_activations (BusContext *context)
1260 return context->limits.max_pending_activations;
1264 bus_context_get_max_services_per_connection (BusContext *context)
1266 return context->limits.max_services_per_connection;
1270 bus_context_get_max_match_rules_per_connection (BusContext *context)
1272 return context->limits.max_match_rules_per_connection;
1276 bus_context_get_max_replies_per_connection (BusContext *context)
1278 return context->limits.max_replies_per_connection;
1282 bus_context_get_reply_timeout (BusContext *context)
1284 return context->limits.reply_timeout;
1288 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...) _DBUS_GNUC_PRINTF (3, 4);
1291 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1295 if (!context->syslog)
1297 /* we're not syslogging; just output to stderr */
1298 va_start (args, msg);
1299 vfprintf (stderr, msg, args);
1300 fprintf (stderr, "\n");
1305 va_start (args, msg);
1307 if (context->log_prefix)
1309 DBusString full_msg;
1311 if (!_dbus_string_init (&full_msg))
1313 if (!_dbus_string_append (&full_msg, context->log_prefix))
1315 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1318 _dbus_system_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1320 _dbus_string_free (&full_msg);
1323 _dbus_system_logv (severity, msg, args);
1329 static inline const char *
1330 nonnull (const char *maybe_null,
1331 const char *if_null)
1333 return (maybe_null ? maybe_null : if_null);
1337 * Log something about a message, usually that it was rejected.
1340 complain_about_message (BusContext *context,
1341 const char *error_name,
1342 const char *complaint,
1344 DBusMessage *message,
1345 DBusConnection *sender,
1346 DBusConnection *proposed_recipient,
1347 dbus_bool_t requested_reply,
1351 DBusError stack_error = DBUS_ERROR_INIT;
1352 const char *sender_name;
1353 const char *sender_loginfo;
1354 const char *proposed_recipient_loginfo;
1356 if (error == NULL && !log)
1361 sender_name = bus_connection_get_name (sender);
1362 sender_loginfo = bus_connection_get_loginfo (sender);
1366 sender_name = "(unset)";
1367 sender_loginfo = "(bus)";
1370 if (proposed_recipient != NULL)
1371 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1373 proposed_recipient_loginfo = "bus";
1375 dbus_set_error (&stack_error, error_name,
1376 "%s, %d matched rules; type=\"%s\", sender=\"%s\" (%s) "
1377 "interface=\"%s\" member=\"%s\" error name=\"%s\" "
1378 "requested_reply=\"%d\" destination=\"%s\" (%s)",
1381 dbus_message_type_to_string (dbus_message_get_type (message)),
1384 nonnull (dbus_message_get_interface (message), "(unset)"),
1385 nonnull (dbus_message_get_member (message), "(unset)"),
1386 nonnull (dbus_message_get_error_name (message), "(unset)"),
1388 nonnull (dbus_message_get_destination (message), DBUS_SERVICE_DBUS),
1389 proposed_recipient_loginfo);
1391 /* If we hit OOM while setting the error, this will syslog "out of memory"
1392 * which is itself an indication that something is seriously wrong */
1394 bus_context_log (context, DBUS_SYSTEM_LOG_SECURITY, "%s",
1395 stack_error.message);
1397 dbus_move_error (&stack_error, error);
1401 * addressed_recipient is the recipient specified in the message.
1403 * proposed_recipient is the recipient we're considering sending
1404 * to right this second, and may be an eavesdropper.
1406 * sender is the sender of the message.
1408 * NULL for proposed_recipient or sender definitely means the bus driver.
1410 * NULL for addressed_recipient may mean the bus driver, or may mean
1411 * no destination was specified in the message (e.g. a signal).
1414 bus_context_check_security_policy (BusContext *context,
1415 BusTransaction *transaction,
1416 DBusConnection *sender,
1417 DBusConnection *addressed_recipient,
1418 DBusConnection *proposed_recipient,
1419 DBusMessage *message,
1423 BusClientPolicy *sender_policy;
1424 BusClientPolicy *recipient_policy;
1425 dbus_int32_t toggles;
1428 dbus_bool_t requested_reply;
1430 type = dbus_message_get_type (message);
1431 dest = dbus_message_get_destination (message);
1433 /* dispatch.c was supposed to ensure these invariants */
1434 _dbus_assert (dest != NULL ||
1435 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1436 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1437 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1438 addressed_recipient != NULL ||
1439 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1443 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1444 case DBUS_MESSAGE_TYPE_SIGNAL:
1445 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1446 case DBUS_MESSAGE_TYPE_ERROR:
1450 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1453 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1454 "Message bus will not accept messages of unknown type\n");
1459 requested_reply = FALSE;
1463 /* First verify the SELinux access controls. If allowed then
1464 * go on with the standard checks.
1466 if (!bus_selinux_allows_send (sender, proposed_recipient,
1467 dbus_message_type_to_string (dbus_message_get_type (message)),
1468 dbus_message_get_interface (message),
1469 dbus_message_get_member (message),
1470 dbus_message_get_error_name (message),
1471 dest ? dest : DBUS_SERVICE_DBUS, error))
1473 if (error != NULL && !dbus_error_is_set (error))
1475 /* don't syslog this, just set the error: avc_has_perm should
1476 * have already written to either the audit log or syslog */
1477 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1478 "An SELinux policy prevents this sender from sending this "
1479 "message to this recipient",
1480 0, message, sender, proposed_recipient, FALSE, FALSE, error);
1481 _dbus_verbose ("SELinux security check denying send to service\n");
1487 if (bus_connection_is_active (sender))
1489 sender_policy = bus_connection_get_policy (sender);
1490 _dbus_assert (sender_policy != NULL);
1492 /* Fill in requested_reply variable with TRUE if this is a
1493 * reply and the reply was pending.
1495 if (dbus_message_get_reply_serial (message) != 0)
1497 if (proposed_recipient != NULL /* not to the bus driver */ &&
1498 addressed_recipient == proposed_recipient /* not eavesdropping */)
1502 dbus_error_init (&error2);
1503 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1505 sender, addressed_recipient, message,
1507 if (dbus_error_is_set (&error2))
1509 dbus_move_error (&error2, error);
1517 /* Policy for inactive connections is that they can only send
1518 * the hello message to the bus driver
1520 if (proposed_recipient == NULL &&
1521 dbus_message_is_method_call (message,
1522 DBUS_INTERFACE_DBUS,
1525 _dbus_verbose ("security check allowing %s message\n",
1531 _dbus_verbose ("security check disallowing non-%s message\n",
1534 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1535 "Client tried to send a message other than %s without being registered",
1544 sender_policy = NULL;
1546 /* If the sender is the bus driver, we assume any reply was a
1547 * requested reply as bus driver won't send bogus ones
1549 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1550 dbus_message_get_reply_serial (message) != 0)
1551 requested_reply = TRUE;
1554 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1555 (sender == NULL && sender_policy == NULL));
1557 if (proposed_recipient != NULL)
1559 /* only the bus driver can send to an inactive recipient (as it
1560 * owns no services, so other apps can't address it). Inactive
1561 * recipients can receive any message.
1563 if (bus_connection_is_active (proposed_recipient))
1565 recipient_policy = bus_connection_get_policy (proposed_recipient);
1566 _dbus_assert (recipient_policy != NULL);
1568 else if (sender == NULL)
1570 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1571 recipient_policy = NULL;
1575 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus\n");
1576 recipient_policy = NULL;
1580 recipient_policy = NULL;
1582 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1583 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1584 (proposed_recipient == NULL && recipient_policy == NULL));
1587 if (sender_policy &&
1588 !bus_client_policy_check_can_send (sender_policy,
1592 message, &toggles, &log))
1594 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1595 "Rejected send message", toggles,
1596 message, sender, proposed_recipient, requested_reply,
1597 (addressed_recipient == proposed_recipient), error);
1598 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1604 /* We want to drop this message, and are only not doing so for backwards
1606 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1607 "Would reject message", toggles,
1608 message, sender, proposed_recipient, requested_reply,
1612 if (recipient_policy &&
1613 !bus_client_policy_check_can_receive (recipient_policy,
1617 addressed_recipient, proposed_recipient,
1620 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1621 "Rejected receive message", toggles,
1622 message, sender, proposed_recipient, requested_reply,
1623 (addressed_recipient == proposed_recipient), NULL);
1624 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1628 /* See if limits on size have been exceeded */
1629 if (proposed_recipient &&
1630 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1631 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1633 complain_about_message (context, DBUS_ERROR_LIMITS_EXCEEDED,
1634 "Rejected: destination has a full message queue",
1635 0, message, sender, proposed_recipient, requested_reply, TRUE,
1637 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1641 /* Record that we will allow a reply here in the future (don't
1642 * bother if the recipient is the bus or this is an eavesdropping
1643 * connection). Only the addressed recipient may reply.
1645 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1647 addressed_recipient &&
1648 addressed_recipient == proposed_recipient && /* not eavesdropping */
1649 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1651 sender, addressed_recipient,
1654 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1658 _dbus_verbose ("security policy allowing message\n");