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
26 #include "activation.h"
27 #include "connection.h"
31 #include "config-parser.h"
34 #include "dir-watch.h"
35 #include <dbus/dbus-list.h>
36 #include <dbus/dbus-hash.h>
37 #include <dbus/dbus-credentials.h>
38 #include <dbus/dbus-internals.h>
56 BusConnections *connections;
57 BusActivation *activation;
58 BusRegistry *registry;
60 BusMatchmaker *matchmaker;
62 unsigned int fork : 1;
63 unsigned int syslog : 1;
64 unsigned int keep_umask : 1;
65 unsigned int allow_anonymous : 1;
66 unsigned int systemd_activation : 1;
69 static dbus_int32_t server_data_slot = -1;
76 #define BUS_SERVER_DATA(server) (dbus_server_get_data ((server), server_data_slot))
79 server_get_context (DBusServer *server)
84 if (!dbus_server_allocate_data_slot (&server_data_slot))
87 bd = BUS_SERVER_DATA (server);
90 dbus_server_free_data_slot (&server_data_slot);
94 context = bd->context;
96 dbus_server_free_data_slot (&server_data_slot);
102 server_watch_callback (DBusWatch *watch,
103 unsigned int condition,
106 /* FIXME this can be done in dbus-mainloop.c
107 * if the code in activation.c for the babysitter
108 * watch handler is fixed.
111 return dbus_watch_handle (watch, condition);
115 add_server_watch (DBusWatch *watch,
118 DBusServer *server = data;
121 context = server_get_context (server);
123 return _dbus_loop_add_watch (context->loop,
124 watch, server_watch_callback, server,
129 remove_server_watch (DBusWatch *watch,
132 DBusServer *server = data;
135 context = server_get_context (server);
137 _dbus_loop_remove_watch (context->loop,
138 watch, server_watch_callback, server);
143 server_timeout_callback (DBusTimeout *timeout,
146 /* can return FALSE on OOM but we just let it fire again later */
147 dbus_timeout_handle (timeout);
151 add_server_timeout (DBusTimeout *timeout,
154 DBusServer *server = data;
157 context = server_get_context (server);
159 return _dbus_loop_add_timeout (context->loop,
160 timeout, server_timeout_callback, server, NULL);
164 remove_server_timeout (DBusTimeout *timeout,
167 DBusServer *server = data;
170 context = server_get_context (server);
172 _dbus_loop_remove_timeout (context->loop,
173 timeout, server_timeout_callback, server);
177 new_connection_callback (DBusServer *server,
178 DBusConnection *new_connection,
181 BusContext *context = data;
183 if (!bus_connections_setup_connection (context->connections, new_connection))
185 _dbus_verbose ("No memory to setup new connection\n");
187 /* if we don't do this, it will get unref'd without
188 * being disconnected... kind of strange really
189 * that we have to do this, people won't get it right
192 dbus_connection_close (new_connection);
195 dbus_connection_set_max_received_size (new_connection,
196 context->limits.max_incoming_bytes);
198 dbus_connection_set_max_message_size (new_connection,
199 context->limits.max_message_size);
201 dbus_connection_set_max_received_unix_fds (new_connection,
202 context->limits.max_incoming_unix_fds);
204 dbus_connection_set_max_message_unix_fds (new_connection,
205 context->limits.max_message_unix_fds);
207 dbus_connection_set_allow_anonymous (new_connection,
208 context->allow_anonymous);
210 /* on OOM, we won't have ref'd the connection so it will die. */
214 free_server_data (void *data)
216 BusServerData *bd = data;
222 setup_server (BusContext *context,
224 char **auth_mechanisms,
229 bd = dbus_new0 (BusServerData, 1);
230 if (bd == NULL || !dbus_server_set_data (server,
232 bd, free_server_data))
239 bd->context = context;
241 if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms))
247 dbus_server_set_new_connection_function (server,
248 new_connection_callback,
251 if (!dbus_server_set_watch_functions (server,
262 if (!dbus_server_set_timeout_functions (server,
264 remove_server_timeout,
275 /* This code only gets executed the first time the
276 * config files are parsed. It is not executed
277 * when config files are reloaded.
280 process_config_first_time_only (BusContext *context,
281 BusConfigParser *parser,
282 const DBusString *address,
283 dbus_bool_t systemd_activation,
286 DBusString log_prefix;
288 DBusList **addresses;
289 const char *user, *pidfile;
290 char **auth_mechanisms;
291 DBusList **auth_mechanisms_list;
295 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
298 auth_mechanisms = NULL;
300 context->systemd_activation = systemd_activation;
302 /* Check for an existing pid file. Of course this is a race;
303 * we'd have to use fcntl() locks on the pid file to
304 * avoid that. But we want to check for the pid file
305 * before overwriting any existing sockets, etc.
307 pidfile = bus_config_parser_get_pidfile (parser);
313 _dbus_string_init_const (&u, pidfile);
315 if (_dbus_stat (&u, &stbuf, NULL))
321 _dbus_string_init (&p);
322 _dbus_file_get_contents(&p, &u, NULL);
323 _dbus_string_parse_int(&p, 0, &pid, NULL);
324 _dbus_string_free(&p);
326 if ((kill((int)pid, 0))) {
327 dbus_set_error(NULL, DBUS_ERROR_FILE_EXISTS,
328 "pid %ld not running, removing stale pid file\n",
330 _dbus_delete_file(&u, NULL);
333 dbus_set_error (error, DBUS_ERROR_FAILED,
334 "The pid file \"%s\" exists, if the message bus is not running, remove this file",
343 /* keep around the pid filename so we can delete it later */
344 context->pidfile = _dbus_strdup (pidfile);
346 /* note that type may be NULL */
347 context->type = _dbus_strdup (bus_config_parser_get_type (parser));
348 if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
351 user = bus_config_parser_get_user (parser);
354 context->user = _dbus_strdup (user);
355 if (context->user == NULL)
359 /* Set up the prefix for syslog messages */
360 if (!_dbus_string_init (&log_prefix))
362 if (context->type && !strcmp (context->type, "system"))
364 if (!_dbus_string_append (&log_prefix, "[system] "))
367 else if (context->type && !strcmp (context->type, "session"))
369 DBusCredentials *credentials;
371 credentials = _dbus_credentials_new_from_current_process ();
374 if (!_dbus_string_append (&log_prefix, "[session "))
376 if (!_dbus_credentials_to_string_append (credentials, &log_prefix))
378 if (!_dbus_string_append (&log_prefix, "] "))
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);
411 auth_mechanisms = NULL;
414 /* Listen on our addresses */
420 server = dbus_server_listen (_dbus_string_get_const_data(address), error);
423 _DBUS_ASSERT_ERROR_IS_SET (error);
426 else if (!setup_server (context, server, auth_mechanisms, error))
428 _DBUS_ASSERT_ERROR_IS_SET (error);
432 if (!_dbus_list_append (&context->servers, server))
437 addresses = bus_config_parser_get_addresses (parser);
439 link = _dbus_list_get_first_link (addresses);
444 server = dbus_server_listen (link->data, error);
447 _DBUS_ASSERT_ERROR_IS_SET (error);
450 else if (!setup_server (context, server, auth_mechanisms, error))
452 _DBUS_ASSERT_ERROR_IS_SET (error);
456 if (!_dbus_list_append (&context->servers, server))
459 link = _dbus_list_get_next_link (addresses, link);
463 context->fork = bus_config_parser_get_fork (parser);
464 context->syslog = bus_config_parser_get_syslog (parser);
465 context->keep_umask = bus_config_parser_get_keep_umask (parser);
466 context->allow_anonymous = bus_config_parser_get_allow_anonymous (parser);
468 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
472 dbus_free_string_array (auth_mechanisms);
477 dbus_free_string_array (auth_mechanisms);
481 /* This code gets executed every time the config files
482 * are parsed: both during BusContext construction
483 * and on reloads. This function is slightly screwy
484 * since it can do a "half reload" in out-of-memory
485 * situations. Realistically, unlikely to ever matter.
488 process_config_every_time (BusContext *context,
489 BusConfigParser *parser,
490 dbus_bool_t is_reload,
493 DBusString full_address;
496 BusActivation *new_activation;
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 process_config_postinit (BusContext *context,
640 BusConfigParser *parser,
643 DBusHashTable *service_context_table;
644 DBusList *watched_dirs = NULL;
646 service_context_table = bus_config_parser_steal_service_context_table (parser);
647 if (!bus_registry_set_service_context_table (context->registry,
648 service_context_table))
654 _dbus_hash_table_unref (service_context_table);
656 /* We need to monitor both the configuration directories and directories
657 * containing .service files.
659 if (!list_concat_new (bus_config_parser_get_conf_dirs (parser),
660 bus_config_parser_get_service_dirs (parser),
667 bus_set_watched_dirs (context, &watched_dirs);
669 _dbus_list_clear (&watched_dirs);
675 bus_context_new (const DBusString *config_file,
676 ForceForkSetting force_fork,
677 DBusPipe *print_addr_pipe,
678 DBusPipe *print_pid_pipe,
679 const DBusString *address,
680 dbus_bool_t systemd_activation,
683 DBusString log_prefix;
685 BusConfigParser *parser;
687 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
692 if (!dbus_server_allocate_data_slot (&server_data_slot))
698 context = dbus_new0 (BusContext, 1);
704 context->refcount = 1;
706 _dbus_generate_uuid (&context->uuid);
708 if (!_dbus_string_copy_data (config_file, &context->config_file))
714 context->loop = _dbus_loop_new ();
715 if (context->loop == NULL)
721 context->registry = bus_registry_new (context);
722 if (context->registry == NULL)
728 parser = bus_config_load (config_file, TRUE, NULL, error);
731 _DBUS_ASSERT_ERROR_IS_SET (error);
735 if (!process_config_first_time_only (context, parser, address, systemd_activation, error))
737 _DBUS_ASSERT_ERROR_IS_SET (error);
740 if (!process_config_every_time (context, parser, FALSE, error))
742 _DBUS_ASSERT_ERROR_IS_SET (error);
746 /* we need another ref of the server data slot for the context
749 if (!dbus_server_allocate_data_slot (&server_data_slot))
750 _dbus_assert_not_reached ("second ref of server data slot failed");
752 /* Note that we don't know whether the print_addr_pipe is
753 * one of the sockets we're using to listen on, or some
754 * other random thing. But I think the answer is "don't do
757 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
760 const char *a = bus_context_get_address (context);
763 _dbus_assert (a != NULL);
764 if (!_dbus_string_init (&addr))
770 if (!_dbus_string_append (&addr, a) ||
771 !_dbus_string_append (&addr, "\n"))
773 _dbus_string_free (&addr);
778 bytes = _dbus_string_get_length (&addr);
779 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
781 /* pipe write returns an error on failure but not short write */
782 if (error != NULL && !dbus_error_is_set (error))
784 dbus_set_error (error, DBUS_ERROR_FAILED,
785 "Printing message bus address: did not write all bytes\n");
787 _dbus_string_free (&addr);
791 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
792 _dbus_pipe_close (print_addr_pipe, NULL);
794 _dbus_string_free (&addr);
797 context->connections = bus_connections_new (context);
798 if (context->connections == NULL)
804 context->matchmaker = bus_matchmaker_new ();
805 if (context->matchmaker == NULL)
811 /* check user before we fork */
812 if (context->user != NULL)
814 if (!_dbus_verify_daemon_user (context->user))
816 dbus_set_error (error, DBUS_ERROR_FAILED,
817 "Could not get UID and GID for username \"%s\"",
823 /* Now become a daemon if appropriate and write out pid file in any case */
827 if (context->pidfile)
828 _dbus_string_init_const (&u, context->pidfile);
830 if ((force_fork != FORK_NEVER && context->fork) || force_fork == FORK_ALWAYS)
832 _dbus_verbose ("Forking and becoming daemon\n");
834 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
837 context->keep_umask))
839 _DBUS_ASSERT_ERROR_IS_SET (error);
845 _dbus_verbose ("Fork not requested\n");
847 /* Need to write PID file and to PID pipe for ourselves,
848 * not for the child process. This is a no-op if the pidfile
849 * is NULL and print_pid_pipe is NULL.
851 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
856 _DBUS_ASSERT_ERROR_IS_SET (error);
862 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
863 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
864 _dbus_pipe_close (print_pid_pipe, NULL);
866 if (!bus_selinux_full_init ())
868 bus_context_log (context, DBUS_SYSTEM_LOG_FATAL, "SELinux enabled but AVC initialization failed; check system log\n");
871 if (!process_config_postinit (context, parser, error))
873 _DBUS_ASSERT_ERROR_IS_SET (error);
879 bus_config_parser_unref (parser);
883 /* Here we change our credentials if required,
884 * as soon as we've set up our sockets and pidfile
886 if (context->user != NULL)
888 if (!_dbus_change_to_daemon_user (context->user, error))
890 _DBUS_ASSERT_ERROR_IS_SET (error);
895 /* FIXME - why not just put this in full_init() below? */
896 bus_selinux_audit_init ();
900 dbus_server_free_data_slot (&server_data_slot);
906 bus_config_parser_unref (parser);
908 bus_context_unref (context);
910 if (server_data_slot >= 0)
911 dbus_server_free_data_slot (&server_data_slot);
917 bus_context_get_id (BusContext *context,
920 return _dbus_uuid_encode (&context->uuid, uuid);
924 bus_context_reload_config (BusContext *context,
927 BusConfigParser *parser;
928 DBusString config_file;
931 /* Flush the user database cache */
932 _dbus_flush_caches ();
935 _dbus_string_init_const (&config_file, context->config_file);
936 parser = bus_config_load (&config_file, TRUE, NULL, error);
939 _DBUS_ASSERT_ERROR_IS_SET (error);
943 if (!process_config_every_time (context, parser, TRUE, error))
945 _DBUS_ASSERT_ERROR_IS_SET (error);
948 if (!process_config_postinit (context, parser, error))
950 _DBUS_ASSERT_ERROR_IS_SET (error);
955 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
958 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
960 bus_config_parser_unref (parser);
965 shutdown_server (BusContext *context,
968 if (server == NULL ||
969 !dbus_server_get_is_connected (server))
972 if (!dbus_server_set_watch_functions (server,
976 _dbus_assert_not_reached ("setting watch functions to NULL failed");
978 if (!dbus_server_set_timeout_functions (server,
982 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
984 dbus_server_disconnect (server);
988 bus_context_shutdown (BusContext *context)
992 link = _dbus_list_get_first_link (&context->servers);
995 shutdown_server (context, link->data);
997 link = _dbus_list_get_next_link (&context->servers, link);
1002 bus_context_ref (BusContext *context)
1004 _dbus_assert (context->refcount > 0);
1005 context->refcount += 1;
1011 bus_context_unref (BusContext *context)
1013 _dbus_assert (context->refcount > 0);
1014 context->refcount -= 1;
1016 if (context->refcount == 0)
1020 _dbus_verbose ("Finalizing bus context %p\n", context);
1022 bus_context_shutdown (context);
1024 if (context->connections)
1026 bus_connections_unref (context->connections);
1027 context->connections = NULL;
1030 if (context->registry)
1032 bus_registry_unref (context->registry);
1033 context->registry = NULL;
1036 if (context->activation)
1038 bus_activation_unref (context->activation);
1039 context->activation = NULL;
1042 link = _dbus_list_get_first_link (&context->servers);
1043 while (link != NULL)
1045 dbus_server_unref (link->data);
1047 link = _dbus_list_get_next_link (&context->servers, link);
1049 _dbus_list_clear (&context->servers);
1051 if (context->policy)
1053 bus_policy_unref (context->policy);
1054 context->policy = NULL;
1059 _dbus_loop_unref (context->loop);
1060 context->loop = NULL;
1063 if (context->matchmaker)
1065 bus_matchmaker_unref (context->matchmaker);
1066 context->matchmaker = NULL;
1069 dbus_free (context->config_file);
1070 dbus_free (context->log_prefix);
1071 dbus_free (context->type);
1072 dbus_free (context->address);
1073 dbus_free (context->user);
1074 dbus_free (context->servicehelper);
1076 if (context->pidfile)
1079 _dbus_string_init_const (&u, context->pidfile);
1081 /* Deliberately ignore errors here, since there's not much
1082 * we can do about it, and we're exiting anyways.
1084 _dbus_delete_file (&u, NULL);
1086 dbus_free (context->pidfile);
1088 dbus_free (context);
1090 dbus_server_free_data_slot (&server_data_slot);
1094 /* type may be NULL */
1096 bus_context_get_type (BusContext *context)
1098 return context->type;
1102 bus_context_get_address (BusContext *context)
1104 return context->address;
1108 bus_context_get_servicehelper (BusContext *context)
1110 return context->servicehelper;
1114 bus_context_get_systemd_activation (BusContext *context)
1116 return context->systemd_activation;
1120 bus_context_get_registry (BusContext *context)
1122 return context->registry;
1126 bus_context_get_connections (BusContext *context)
1128 return context->connections;
1132 bus_context_get_activation (BusContext *context)
1134 return context->activation;
1138 bus_context_get_matchmaker (BusContext *context)
1140 return context->matchmaker;
1144 bus_context_get_loop (BusContext *context)
1146 return context->loop;
1150 bus_context_allow_unix_user (BusContext *context,
1153 return bus_policy_allow_unix_user (context->policy,
1157 /* For now this is never actually called because the default
1158 * DBusConnection behavior of 'same user that owns the bus can connect'
1159 * is all it would do.
1162 bus_context_allow_windows_user (BusContext *context,
1163 const char *windows_sid)
1165 return bus_policy_allow_windows_user (context->policy,
1170 bus_context_get_policy (BusContext *context)
1172 return context->policy;
1176 bus_context_create_client_policy (BusContext *context,
1177 DBusConnection *connection,
1180 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1181 return bus_policy_create_client_policy (context->policy, connection,
1186 bus_context_get_activation_timeout (BusContext *context)
1189 return context->limits.activation_timeout;
1193 bus_context_get_auth_timeout (BusContext *context)
1195 return context->limits.auth_timeout;
1199 bus_context_get_max_completed_connections (BusContext *context)
1201 return context->limits.max_completed_connections;
1205 bus_context_get_max_incomplete_connections (BusContext *context)
1207 return context->limits.max_incomplete_connections;
1211 bus_context_get_max_connections_per_user (BusContext *context)
1213 return context->limits.max_connections_per_user;
1217 bus_context_get_max_pending_activations (BusContext *context)
1219 return context->limits.max_pending_activations;
1223 bus_context_get_max_services_per_connection (BusContext *context)
1225 return context->limits.max_services_per_connection;
1229 bus_context_get_max_match_rules_per_connection (BusContext *context)
1231 return context->limits.max_match_rules_per_connection;
1235 bus_context_get_max_replies_per_connection (BusContext *context)
1237 return context->limits.max_replies_per_connection;
1241 bus_context_get_reply_timeout (BusContext *context)
1243 return context->limits.reply_timeout;
1247 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...) _DBUS_GNUC_PRINTF (3, 4);
1250 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1254 if (!context->syslog)
1257 va_start (args, msg);
1259 if (context->log_prefix)
1261 DBusString full_msg;
1263 if (!_dbus_string_init (&full_msg))
1265 if (!_dbus_string_append (&full_msg, context->log_prefix))
1267 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1270 _dbus_system_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1272 _dbus_string_free (&full_msg);
1275 _dbus_system_logv (severity, msg, args);
1282 * addressed_recipient is the recipient specified in the message.
1284 * proposed_recipient is the recipient we're considering sending
1285 * to right this second, and may be an eavesdropper.
1287 * sender is the sender of the message.
1289 * NULL for proposed_recipient or sender definitely means the bus driver.
1291 * NULL for addressed_recipient may mean the bus driver, or may mean
1292 * no destination was specified in the message (e.g. a signal).
1295 bus_context_check_security_policy (BusContext *context,
1296 BusTransaction *transaction,
1297 DBusConnection *sender,
1298 DBusConnection *addressed_recipient,
1299 DBusConnection *proposed_recipient,
1300 DBusMessage *message,
1304 BusClientPolicy *sender_policy;
1305 BusClientPolicy *recipient_policy;
1306 dbus_int32_t toggles;
1309 dbus_bool_t requested_reply;
1310 const char *sender_name;
1311 const char *sender_loginfo;
1312 const char *proposed_recipient_loginfo;
1314 type = dbus_message_get_type (message);
1315 dest = dbus_message_get_destination (message);
1317 /* dispatch.c was supposed to ensure these invariants */
1318 _dbus_assert (dest != NULL ||
1319 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1320 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1321 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1322 addressed_recipient != NULL ||
1323 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1325 /* Used in logging below */
1328 sender_name = bus_connection_get_name (sender);
1329 sender_loginfo = bus_connection_get_loginfo (sender);
1334 sender_loginfo = "(bus)";
1337 if (proposed_recipient != NULL)
1338 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1340 proposed_recipient_loginfo = "bus";
1344 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1345 case DBUS_MESSAGE_TYPE_SIGNAL:
1346 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1347 case DBUS_MESSAGE_TYPE_ERROR:
1351 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1354 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1355 "Message bus will not accept messages of unknown type\n");
1360 requested_reply = FALSE;
1364 /* First verify the SELinux access controls. If allowed then
1365 * go on with the standard checks.
1367 if (!bus_selinux_allows_send (sender, proposed_recipient,
1368 dbus_message_type_to_string (dbus_message_get_type (message)),
1369 dbus_message_get_interface (message),
1370 dbus_message_get_member (message),
1371 dbus_message_get_error_name (message),
1372 dest ? dest : DBUS_SERVICE_DBUS, error))
1374 if (error != NULL && !dbus_error_is_set (error))
1376 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1377 "An SELinux policy prevents this sender "
1378 "from sending this message to this recipient "
1379 "(rejected message had sender \"%s\" interface \"%s\" "
1380 "member \"%s\" error name \"%s\" destination \"%s\")",
1381 sender_name ? sender_name : "(unset)",
1382 dbus_message_get_interface (message) ?
1383 dbus_message_get_interface (message) : "(unset)",
1384 dbus_message_get_member (message) ?
1385 dbus_message_get_member (message) : "(unset)",
1386 dbus_message_get_error_name (message) ?
1387 dbus_message_get_error_name (message) : "(unset)",
1388 dest ? dest : DBUS_SERVICE_DBUS);
1389 _dbus_verbose ("SELinux security check denying send to service\n");
1395 if (bus_connection_is_active (sender))
1397 sender_policy = bus_connection_get_policy (sender);
1398 _dbus_assert (sender_policy != NULL);
1400 /* Fill in requested_reply variable with TRUE if this is a
1401 * reply and the reply was pending.
1403 if (dbus_message_get_reply_serial (message) != 0)
1405 if (proposed_recipient != NULL /* not to the bus driver */ &&
1406 addressed_recipient == proposed_recipient /* not eavesdropping */)
1410 dbus_error_init (&error2);
1411 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1413 sender, addressed_recipient, message,
1415 if (dbus_error_is_set (&error2))
1417 dbus_move_error (&error2, error);
1425 /* Policy for inactive connections is that they can only send
1426 * the hello message to the bus driver
1428 if (proposed_recipient == NULL &&
1429 dbus_message_is_method_call (message,
1430 DBUS_INTERFACE_DBUS,
1433 _dbus_verbose ("security check allowing %s message\n",
1439 _dbus_verbose ("security check disallowing non-%s message\n",
1442 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1443 "Client tried to send a message other than %s without being registered",
1452 sender_policy = NULL;
1454 /* If the sender is the bus driver, we assume any reply was a
1455 * requested reply as bus driver won't send bogus ones
1457 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1458 dbus_message_get_reply_serial (message) != 0)
1459 requested_reply = TRUE;
1462 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1463 (sender == NULL && sender_policy == NULL));
1465 if (proposed_recipient != NULL)
1467 /* only the bus driver can send to an inactive recipient (as it
1468 * owns no services, so other apps can't address it). Inactive
1469 * recipients can receive any message.
1471 if (bus_connection_is_active (proposed_recipient))
1473 recipient_policy = bus_connection_get_policy (proposed_recipient);
1474 _dbus_assert (recipient_policy != NULL);
1476 else if (sender == NULL)
1478 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1479 recipient_policy = NULL;
1483 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus\n");
1484 recipient_policy = NULL;
1488 recipient_policy = NULL;
1490 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1491 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1492 (proposed_recipient == NULL && recipient_policy == NULL));
1495 if (sender_policy &&
1496 !bus_client_policy_check_can_send (sender_policy,
1500 message, &toggles, &log))
1502 const char *msg = "Rejected send message, %d matched rules; "
1503 "type=\"%s\", sender=\"%s\" (%s) interface=\"%s\" member=\"%s\" error name=\"%s\" requested_reply=%d destination=\"%s\" (%s))";
1505 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED, msg,
1507 dbus_message_type_to_string (dbus_message_get_type (message)),
1508 sender_name ? sender_name : "(unset)",
1510 dbus_message_get_interface (message) ?
1511 dbus_message_get_interface (message) : "(unset)",
1512 dbus_message_get_member (message) ?
1513 dbus_message_get_member (message) : "(unset)",
1514 dbus_message_get_error_name (message) ?
1515 dbus_message_get_error_name (message) : "(unset)",
1517 dest ? dest : DBUS_SERVICE_DBUS,
1518 proposed_recipient_loginfo);
1519 /* Needs to be duplicated to avoid calling malloc and having to handle OOM */
1520 if (addressed_recipient == proposed_recipient)
1521 bus_context_log (context, DBUS_SYSTEM_LOG_SECURITY, msg,
1523 dbus_message_type_to_string (dbus_message_get_type (message)),
1524 sender_name ? sender_name : "(unset)",
1526 dbus_message_get_interface (message) ?
1527 dbus_message_get_interface (message) : "(unset)",
1528 dbus_message_get_member (message) ?
1529 dbus_message_get_member (message) : "(unset)",
1530 dbus_message_get_error_name (message) ?
1531 dbus_message_get_error_name (message) : "(unset)",
1533 dest ? dest : DBUS_SERVICE_DBUS,
1534 proposed_recipient_loginfo);
1535 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1540 bus_context_log (context, DBUS_SYSTEM_LOG_SECURITY,
1541 "Would reject message, %d matched rules; "
1542 "type=\"%s\", sender=\"%s\" (%s) interface=\"%s\" member=\"%s\" error name=\"%s\" requested_reply=%d destination=\"%s\" (%s))",
1544 dbus_message_type_to_string (dbus_message_get_type (message)),
1545 sender_name ? sender_name : "(unset)",
1547 dbus_message_get_interface (message) ?
1548 dbus_message_get_interface (message) : "(unset)",
1549 dbus_message_get_member (message) ?
1550 dbus_message_get_member (message) : "(unset)",
1551 dbus_message_get_error_name (message) ?
1552 dbus_message_get_error_name (message) : "(unset)",
1554 dest ? dest : DBUS_SERVICE_DBUS,
1555 proposed_recipient_loginfo);
1557 if (recipient_policy &&
1558 !bus_client_policy_check_can_receive (recipient_policy,
1562 addressed_recipient, proposed_recipient,
1565 const char *msg = "Rejected receive message, %d matched rules; "
1566 "type=\"%s\" sender=\"%s\" (%s) interface=\"%s\" member=\"%s\" error name=\"%s\" reply serial=%u requested_reply=%d destination=\"%s\" (%s))";
1568 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED, msg,
1570 dbus_message_type_to_string (dbus_message_get_type (message)),
1571 sender_name ? sender_name : "(unset)",
1573 dbus_message_get_interface (message) ?
1574 dbus_message_get_interface (message) : "(unset)",
1575 dbus_message_get_member (message) ?
1576 dbus_message_get_member (message) : "(unset)",
1577 dbus_message_get_error_name (message) ?
1578 dbus_message_get_error_name (message) : "(unset)",
1579 dbus_message_get_reply_serial (message),
1581 dest ? dest : DBUS_SERVICE_DBUS,
1582 proposed_recipient_loginfo);
1583 /* Needs to be duplicated to avoid calling malloc and having to handle OOM */
1584 if (addressed_recipient == proposed_recipient)
1585 bus_context_log (context, DBUS_SYSTEM_LOG_SECURITY, msg,
1587 dbus_message_type_to_string (dbus_message_get_type (message)),
1588 sender_name ? sender_name : "(unset)",
1590 dbus_message_get_interface (message) ?
1591 dbus_message_get_interface (message) : "(unset)",
1592 dbus_message_get_member (message) ?
1593 dbus_message_get_member (message) : "(unset)",
1594 dbus_message_get_error_name (message) ?
1595 dbus_message_get_error_name (message) : "(unset)",
1596 dbus_message_get_reply_serial (message),
1598 dest ? dest : DBUS_SERVICE_DBUS,
1599 proposed_recipient_loginfo);
1600 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1604 /* See if limits on size have been exceeded */
1605 if (proposed_recipient &&
1606 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1607 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1609 dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1610 "The destination service \"%s\" has a full message queue",
1611 dest ? dest : (proposed_recipient ?
1612 bus_connection_get_name (proposed_recipient) :
1613 DBUS_SERVICE_DBUS));
1614 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1618 /* Record that we will allow a reply here in the future (don't
1619 * bother if the recipient is the bus or this is an eavesdropping
1620 * connection). Only the addressed recipient may reply.
1622 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1624 addressed_recipient &&
1625 addressed_recipient == proposed_recipient && /* not eavesdropping */
1626 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1628 sender, addressed_recipient,
1631 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1635 _dbus_verbose ("security policy allowing message\n");