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>
62 BusConnections *connections;
63 BusActivation *activation;
64 BusRegistry *registry;
66 BusMatchmaker *matchmaker;
68 unsigned int fork : 1;
69 unsigned int syslog : 1;
70 unsigned int keep_umask : 1;
71 unsigned int allow_anonymous : 1;
72 unsigned int systemd_activation : 1;
73 unsigned int is_kdbus : 1;
74 DBusConnection *myConnection;
77 static dbus_int32_t server_data_slot = -1;
84 #define BUS_SERVER_DATA(server) (dbus_server_get_data ((server), server_data_slot))
87 server_get_context (DBusServer *server)
92 if (!dbus_server_allocate_data_slot (&server_data_slot))
95 bd = BUS_SERVER_DATA (server);
98 dbus_server_free_data_slot (&server_data_slot);
102 context = bd->context;
104 dbus_server_free_data_slot (&server_data_slot);
110 add_server_watch (DBusWatch *watch,
113 DBusServer *server = data;
116 context = server_get_context (server);
118 return _dbus_loop_add_watch (context->loop, watch);
122 remove_server_watch (DBusWatch *watch,
125 DBusServer *server = data;
128 context = server_get_context (server);
130 _dbus_loop_remove_watch (context->loop, watch);
134 toggle_server_watch (DBusWatch *watch,
137 DBusServer *server = data;
140 context = server_get_context (server);
142 _dbus_loop_toggle_watch (context->loop, watch);
146 add_server_timeout (DBusTimeout *timeout,
149 DBusServer *server = data;
152 context = server_get_context (server);
154 return _dbus_loop_add_timeout (context->loop, timeout);
158 remove_server_timeout (DBusTimeout *timeout,
161 DBusServer *server = data;
164 context = server_get_context (server);
166 _dbus_loop_remove_timeout (context->loop, timeout);
170 new_connection_callback (DBusServer *server,
171 DBusConnection *new_connection,
174 BusContext *context = data;
176 if (!bus_connections_setup_connection (context->connections, new_connection))
178 _dbus_verbose ("No memory to setup new connection\n");
180 /* if we don't do this, it will get unref'd without
181 * being disconnected... kind of strange really
182 * that we have to do this, people won't get it right
185 dbus_connection_close (new_connection);
188 dbus_connection_set_max_received_size (new_connection,
189 context->limits.max_incoming_bytes);
191 dbus_connection_set_max_message_size (new_connection,
192 context->limits.max_message_size);
194 dbus_connection_set_max_received_unix_fds (new_connection,
195 context->limits.max_incoming_unix_fds);
197 dbus_connection_set_max_message_unix_fds (new_connection,
198 context->limits.max_message_unix_fds);
200 dbus_connection_set_allow_anonymous (new_connection,
201 context->allow_anonymous);
203 /* on OOM, we won't have ref'd the connection so it will die. */
207 free_server_data (void *data)
209 BusServerData *bd = data;
215 setup_server (BusContext *context,
217 char **auth_mechanisms,
222 bd = dbus_new0 (BusServerData, 1);
223 if (bd == NULL || !dbus_server_set_data (server,
225 bd, free_server_data))
232 bd->context = context;
234 if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms))
240 dbus_server_set_new_connection_function (server,
241 new_connection_callback,
244 if (!dbus_server_set_watch_functions (server,
255 if (!dbus_server_set_timeout_functions (server,
257 remove_server_timeout,
268 /* This code only gets executed the first time the
269 * config files are parsed. It is not executed
270 * when config files are reloaded.
273 process_config_first_time_only (BusContext *context,
274 BusConfigParser *parser,
275 const DBusString *address,
276 BusContextFlags flags,
279 DBusString log_prefix;
281 DBusList **addresses;
282 const char *user, *pidfile;
283 char **auth_mechanisms;
284 DBusList **auth_mechanisms_list;
288 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
291 auth_mechanisms = NULL;
294 _dbus_init_system_log (TRUE);
296 if (flags & BUS_CONTEXT_FLAG_SYSTEMD_ACTIVATION)
297 context->systemd_activation = TRUE;
299 context->systemd_activation = FALSE;
301 /* Check for an existing pid file. Of course this is a race;
302 * we'd have to use fcntl() locks on the pid file to
303 * avoid that. But we want to check for the pid file
304 * before overwriting any existing sockets, etc.
307 if (flags & BUS_CONTEXT_FLAG_WRITE_PID_FILE)
308 pidfile = bus_config_parser_get_pidfile (parser);
315 _dbus_string_init_const (&u, pidfile);
317 if (_dbus_stat (&u, &stbuf, NULL))
323 _dbus_string_init (&p);
324 _dbus_file_get_contents(&p, &u, NULL);
325 _dbus_string_parse_int(&p, 0, &pid, NULL);
326 _dbus_string_free(&p);
328 if ((kill((int)pid, 0))) {
329 dbus_set_error(NULL, DBUS_ERROR_FILE_EXISTS,
330 "pid %ld not running, removing stale pid file\n",
332 _dbus_delete_file(&u, NULL);
335 dbus_set_error (error, DBUS_ERROR_FAILED,
336 "The pid file \"%s\" exists, if the message bus is not running, remove this file",
345 /* keep around the pid filename so we can delete it later */
346 context->pidfile = _dbus_strdup (pidfile);
348 /* note that type may be NULL */
349 context->type = _dbus_strdup (bus_config_parser_get_type (parser));
350 if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
353 user = bus_config_parser_get_user (parser);
356 context->user = _dbus_strdup (user);
357 if (context->user == NULL)
361 /* Set up the prefix for syslog messages */
362 if (!_dbus_string_init (&log_prefix))
364 if (context->type && !strcmp (context->type, "system"))
366 if (!_dbus_string_append (&log_prefix, "[system] "))
369 else if (context->type && !strcmp (context->type, "session"))
371 DBusCredentials *credentials;
373 credentials = _dbus_credentials_new_from_current_process ();
376 if (!_dbus_string_append (&log_prefix, "[session "))
378 _dbus_credentials_unref (credentials);
381 if (!_dbus_credentials_to_string_append (credentials, &log_prefix))
383 _dbus_credentials_unref (credentials);
386 if (!_dbus_string_append (&log_prefix, "] "))
388 _dbus_credentials_unref (credentials);
391 _dbus_credentials_unref (credentials);
393 if (!_dbus_string_steal_data (&log_prefix, &context->log_prefix))
395 _dbus_string_free (&log_prefix);
397 /* Build an array of auth mechanisms */
399 auth_mechanisms_list = bus_config_parser_get_mechanisms (parser);
400 len = _dbus_list_get_length (auth_mechanisms_list);
406 auth_mechanisms = dbus_new0 (char*, len + 1);
407 if (auth_mechanisms == NULL)
411 link = _dbus_list_get_first_link (auth_mechanisms_list);
414 auth_mechanisms[i] = _dbus_strdup (link->data);
415 if (auth_mechanisms[i] == NULL)
417 link = _dbus_list_get_next_link (auth_mechanisms_list, link);
423 auth_mechanisms = NULL;
426 /* Listen on our addresses */
430 if(!strcmp(_dbus_string_get_const_data(address), "kdbus"))
436 context->is_kdbus = TRUE;
438 if(!strcmp (context->type, "system"))
439 type = DBUS_BUS_SYSTEM;
440 else if(!strcmp (context->type, "session"))
441 type = DBUS_BUS_SESSION;
443 type = DBUS_BUS_STARTER;
445 bus_address = make_kdbus_bus(type, error);
446 if(bus_address == NULL)
449 server = fake_server(bus_address);
456 if (!_dbus_list_append (&context->servers, server))
462 context->myConnection = daemon_as_client(type, bus_address, error);
463 if(context->myConnection == NULL)
471 server = dbus_server_listen (_dbus_string_get_const_data(address), error);
474 _DBUS_ASSERT_ERROR_IS_SET (error);
477 else if (!setup_server (context, server, auth_mechanisms, error))
479 _DBUS_ASSERT_ERROR_IS_SET (error);
483 if (!_dbus_list_append (&context->servers, server))
489 addresses = bus_config_parser_get_addresses (parser);
491 link = _dbus_list_get_first_link (addresses);
496 server = dbus_server_listen (link->data, error);
499 _DBUS_ASSERT_ERROR_IS_SET (error);
502 else if (!setup_server (context, server, auth_mechanisms, error))
504 _DBUS_ASSERT_ERROR_IS_SET (error);
508 if (!_dbus_list_append (&context->servers, server))
511 link = _dbus_list_get_next_link (addresses, link);
515 context->fork = bus_config_parser_get_fork (parser);
516 context->syslog = bus_config_parser_get_syslog (parser);
517 context->keep_umask = bus_config_parser_get_keep_umask (parser);
518 context->allow_anonymous = bus_config_parser_get_allow_anonymous (parser);
520 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
524 dbus_free_string_array (auth_mechanisms);
529 dbus_free_string_array (auth_mechanisms);
533 /* This code gets executed every time the config files
534 * are parsed: both during BusContext construction
535 * and on reloads. This function is slightly screwy
536 * since it can do a "half reload" in out-of-memory
537 * situations. Realistically, unlikely to ever matter.
540 process_config_every_time (BusContext *context,
541 BusConfigParser *parser,
542 dbus_bool_t is_reload,
545 DBusString full_address;
549 const char *servicehelper;
554 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
559 if (!_dbus_string_init (&full_address))
565 /* get our limits and timeout lengths */
566 bus_config_parser_get_limits (parser, &context->limits);
569 bus_policy_unref (context->policy);
570 context->policy = bus_config_parser_steal_policy (parser);
571 _dbus_assert (context->policy != NULL);
573 /* We have to build the address backward, so that
574 * <listen> later in the config file have priority
576 link = _dbus_list_get_last_link (&context->servers);
579 addr = dbus_server_get_address (link->data);
586 if (_dbus_string_get_length (&full_address) > 0)
588 if (!_dbus_string_append (&full_address, ";"))
595 if (!_dbus_string_append (&full_address, addr))
604 link = _dbus_list_get_prev_link (&context->servers, link);
608 dbus_free (context->address);
610 if (!_dbus_string_copy_data (&full_address, &context->address))
616 /* get the service directories */
617 dirs = bus_config_parser_get_service_dirs (parser);
619 /* and the service helper */
620 servicehelper = bus_config_parser_get_servicehelper (parser);
622 s = _dbus_strdup(servicehelper);
623 if (s == NULL && servicehelper != NULL)
630 dbus_free(context->servicehelper);
631 context->servicehelper = s;
634 /* Create activation subsystem */
635 if (context->activation)
637 if (!bus_activation_reload (context->activation, &full_address, dirs, error))
642 context->activation = bus_activation_new (context, &full_address, dirs, error);
645 if (context->activation == NULL)
647 _DBUS_ASSERT_ERROR_IS_SET (error);
651 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
655 _dbus_string_free (&full_address);
664 list_concat_new (DBusList **a,
672 for (link = _dbus_list_get_first_link (a); link; link = _dbus_list_get_next_link (a, link))
674 if (!_dbus_list_append (result, link->data))
677 for (link = _dbus_list_get_first_link (b); link; link = _dbus_list_get_next_link (b, link))
679 if (!_dbus_list_append (result, link->data))
685 _dbus_list_clear (result);
690 raise_file_descriptor_limit (BusContext *context)
693 /* I just picked this out of thin air; we need some extra
694 * descriptors for things like any internal pipes we create,
695 * inotify, connections to SELinux, etc.
697 unsigned int arbitrary_extra_fds = 32;
700 limit = context->limits.max_completed_connections +
701 context->limits.max_incomplete_connections
702 + arbitrary_extra_fds;
704 _dbus_request_file_descriptor_limit (limit);
708 process_config_postinit (BusContext *context,
709 BusConfigParser *parser,
712 DBusHashTable *service_context_table;
713 DBusList *watched_dirs = NULL;
715 raise_file_descriptor_limit (context);
717 service_context_table = bus_config_parser_steal_service_context_table (parser);
718 if (!bus_registry_set_service_context_table (context->registry,
719 service_context_table))
725 _dbus_hash_table_unref (service_context_table);
727 /* We need to monitor both the configuration directories and directories
728 * containing .service files.
730 if (!list_concat_new (bus_config_parser_get_conf_dirs (parser),
731 bus_config_parser_get_service_dirs (parser),
738 bus_set_watched_dirs (context, &watched_dirs);
740 _dbus_list_clear (&watched_dirs);
746 bus_context_new (const DBusString *config_file,
747 BusContextFlags flags,
748 DBusPipe *print_addr_pipe,
749 DBusPipe *print_pid_pipe,
750 const DBusString *address,
754 BusConfigParser *parser;
756 _dbus_assert ((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 ||
757 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS) == 0);
759 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
764 if (!dbus_server_allocate_data_slot (&server_data_slot))
770 context = dbus_new0 (BusContext, 1);
776 context->refcount = 1;
778 _dbus_generate_uuid (&context->uuid);
780 if (!_dbus_string_copy_data (config_file, &context->config_file))
786 context->loop = _dbus_loop_new ();
787 if (context->loop == NULL)
793 context->registry = bus_registry_new (context);
794 if (context->registry == NULL)
800 parser = bus_config_load (config_file, TRUE, NULL, error);
803 _DBUS_ASSERT_ERROR_IS_SET (error);
807 if (!process_config_first_time_only (context, parser, address, flags, error))
809 _DBUS_ASSERT_ERROR_IS_SET (error);
812 if (!process_config_every_time (context, parser, FALSE, error))
814 _DBUS_ASSERT_ERROR_IS_SET (error);
818 /* we need another ref of the server data slot for the context
821 if (!dbus_server_allocate_data_slot (&server_data_slot))
822 _dbus_assert_not_reached ("second ref of server data slot failed");
824 /* Note that we don't know whether the print_addr_pipe is
825 * one of the sockets we're using to listen on, or some
826 * other random thing. But I think the answer is "don't do
829 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
832 const char *a = bus_context_get_address (context);
835 _dbus_assert (a != NULL);
836 if (!_dbus_string_init (&addr))
842 if (!_dbus_string_append (&addr, a) ||
843 !_dbus_string_append (&addr, "\n"))
845 _dbus_string_free (&addr);
850 bytes = _dbus_string_get_length (&addr);
851 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
853 /* pipe write returns an error on failure but not short write */
854 if (error != NULL && !dbus_error_is_set (error))
856 dbus_set_error (error, DBUS_ERROR_FAILED,
857 "Printing message bus address: did not write all bytes\n");
859 _dbus_string_free (&addr);
863 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
864 _dbus_pipe_close (print_addr_pipe, NULL);
866 _dbus_string_free (&addr);
869 context->connections = bus_connections_new (context);
870 if (context->connections == NULL)
876 context->matchmaker = bus_matchmaker_new ();
877 if (context->matchmaker == NULL)
883 /* check user before we fork */
884 if (context->user != NULL)
886 if (!_dbus_verify_daemon_user (context->user))
888 dbus_set_error (error, DBUS_ERROR_FAILED,
889 "Could not get UID and GID for username \"%s\"",
895 /* Now become a daemon if appropriate and write out pid file in any case */
899 if (context->pidfile)
900 _dbus_string_init_const (&u, context->pidfile);
902 if (((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 && context->fork) ||
903 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS))
905 _dbus_verbose ("Forking and becoming daemon\n");
907 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
910 context->keep_umask))
912 _DBUS_ASSERT_ERROR_IS_SET (error);
918 _dbus_verbose ("Fork not requested\n");
920 /* Need to write PID file and to PID pipe for ourselves,
921 * not for the child process. This is a no-op if the pidfile
922 * is NULL and print_pid_pipe is NULL.
924 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
929 _DBUS_ASSERT_ERROR_IS_SET (error);
935 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
936 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
937 _dbus_pipe_close (print_pid_pipe, NULL);
939 if (!bus_selinux_full_init ())
941 bus_context_log (context, DBUS_SYSTEM_LOG_FATAL, "SELinux enabled but AVC initialization failed; check system log\n");
944 if (!process_config_postinit (context, parser, error))
946 _DBUS_ASSERT_ERROR_IS_SET (error);
952 bus_config_parser_unref (parser);
956 /* Here we change our credentials if required,
957 * as soon as we've set up our sockets and pidfile
959 if (context->user != NULL)
961 if (!_dbus_change_to_daemon_user (context->user, error))
963 _DBUS_ASSERT_ERROR_IS_SET (error);
968 /* FIXME - why not just put this in full_init() below? */
969 bus_selinux_audit_init ();
973 dbus_server_free_data_slot (&server_data_slot);
979 bus_config_parser_unref (parser);
981 bus_context_unref (context);
983 if (server_data_slot >= 0)
984 dbus_server_free_data_slot (&server_data_slot);
990 bus_context_get_id (BusContext *context,
993 return _dbus_uuid_encode (&context->uuid, uuid);
997 bus_context_reload_config (BusContext *context,
1000 BusConfigParser *parser;
1001 DBusString config_file;
1004 /* Flush the user database cache */
1005 _dbus_flush_caches ();
1008 _dbus_string_init_const (&config_file, context->config_file);
1009 parser = bus_config_load (&config_file, TRUE, NULL, error);
1012 _DBUS_ASSERT_ERROR_IS_SET (error);
1016 if (!process_config_every_time (context, parser, TRUE, error))
1018 _DBUS_ASSERT_ERROR_IS_SET (error);
1021 if (!process_config_postinit (context, parser, error))
1023 _DBUS_ASSERT_ERROR_IS_SET (error);
1028 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
1031 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
1033 bus_config_parser_unref (parser);
1038 shutdown_server (BusContext *context,
1041 if (server == NULL ||
1042 !dbus_server_get_is_connected (server))
1045 if (!dbus_server_set_watch_functions (server,
1049 _dbus_assert_not_reached ("setting watch functions to NULL failed");
1051 if (!dbus_server_set_timeout_functions (server,
1055 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
1057 dbus_server_disconnect (server);
1061 bus_context_shutdown (BusContext *context)
1065 link = _dbus_list_get_first_link (&context->servers);
1066 while (link != NULL)
1068 shutdown_server (context, link->data);
1070 link = _dbus_list_get_next_link (&context->servers, link);
1075 bus_context_ref (BusContext *context)
1077 _dbus_assert (context->refcount > 0);
1078 context->refcount += 1;
1084 bus_context_unref (BusContext *context)
1086 _dbus_assert (context->refcount > 0);
1087 context->refcount -= 1;
1089 if (context->refcount == 0)
1093 _dbus_verbose ("Finalizing bus context %p\n", context);
1095 bus_context_shutdown (context);
1097 if (context->connections)
1099 bus_connections_unref (context->connections);
1100 context->connections = NULL;
1103 if (context->registry)
1105 bus_registry_unref (context->registry);
1106 context->registry = NULL;
1109 if (context->activation)
1111 bus_activation_unref (context->activation);
1112 context->activation = NULL;
1115 link = _dbus_list_get_first_link (&context->servers);
1116 while (link != NULL)
1118 dbus_server_unref (link->data);
1120 link = _dbus_list_get_next_link (&context->servers, link);
1122 _dbus_list_clear (&context->servers);
1124 if (context->policy)
1126 bus_policy_unref (context->policy);
1127 context->policy = NULL;
1132 _dbus_loop_unref (context->loop);
1133 context->loop = NULL;
1136 if (context->matchmaker)
1138 bus_matchmaker_unref (context->matchmaker);
1139 context->matchmaker = NULL;
1142 dbus_free (context->config_file);
1143 dbus_free (context->log_prefix);
1144 dbus_free (context->type);
1145 dbus_free (context->address);
1146 dbus_free (context->user);
1147 dbus_free (context->servicehelper);
1149 if (context->pidfile)
1152 _dbus_string_init_const (&u, context->pidfile);
1154 /* Deliberately ignore errors here, since there's not much
1155 * we can do about it, and we're exiting anyways.
1157 _dbus_delete_file (&u, NULL);
1159 dbus_free (context->pidfile);
1161 dbus_free (context);
1163 dbus_server_free_data_slot (&server_data_slot);
1167 /* type may be NULL */
1169 bus_context_get_type (BusContext *context)
1171 return context->type;
1175 bus_context_get_address (BusContext *context)
1177 return context->address;
1181 bus_context_get_servicehelper (BusContext *context)
1183 return context->servicehelper;
1187 bus_context_get_systemd_activation (BusContext *context)
1189 return context->systemd_activation;
1193 bus_context_get_registry (BusContext *context)
1195 return context->registry;
1199 bus_context_get_connections (BusContext *context)
1201 return context->connections;
1205 bus_context_get_activation (BusContext *context)
1207 return context->activation;
1211 bus_context_get_matchmaker (BusContext *context)
1213 return context->matchmaker;
1217 bus_context_get_loop (BusContext *context)
1219 return context->loop;
1222 DBusConnection* bus_context_get_myConnection(BusContext *context)
1224 return context->myConnection;
1228 bus_context_allow_unix_user (BusContext *context,
1231 return bus_policy_allow_unix_user (context->policy,
1235 /* For now this is never actually called because the default
1236 * DBusConnection behavior of 'same user that owns the bus can connect'
1237 * is all it would do.
1240 bus_context_allow_windows_user (BusContext *context,
1241 const char *windows_sid)
1243 return bus_policy_allow_windows_user (context->policy,
1248 bus_context_get_policy (BusContext *context)
1250 return context->policy;
1254 bus_context_create_client_policy (BusContext *context,
1255 DBusConnection *connection,
1258 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1259 return bus_policy_create_client_policy (context->policy, connection,
1264 bus_context_get_activation_timeout (BusContext *context)
1267 return context->limits.activation_timeout;
1271 bus_context_get_auth_timeout (BusContext *context)
1273 return context->limits.auth_timeout;
1277 bus_context_get_max_completed_connections (BusContext *context)
1279 return context->limits.max_completed_connections;
1283 bus_context_get_max_incomplete_connections (BusContext *context)
1285 return context->limits.max_incomplete_connections;
1289 bus_context_get_max_connections_per_user (BusContext *context)
1291 return context->limits.max_connections_per_user;
1295 bus_context_get_max_pending_activations (BusContext *context)
1297 return context->limits.max_pending_activations;
1301 bus_context_get_max_services_per_connection (BusContext *context)
1303 return context->limits.max_services_per_connection;
1307 bus_context_get_max_match_rules_per_connection (BusContext *context)
1309 return context->limits.max_match_rules_per_connection;
1313 bus_context_get_max_replies_per_connection (BusContext *context)
1315 return context->limits.max_replies_per_connection;
1319 bus_context_get_reply_timeout (BusContext *context)
1321 return context->limits.reply_timeout;
1325 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...) _DBUS_GNUC_PRINTF (3, 4);
1328 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1332 if (!context->syslog)
1334 /* we're not syslogging; just output to stderr */
1335 va_start (args, msg);
1336 vfprintf (stderr, msg, args);
1337 fprintf (stderr, "\n");
1342 va_start (args, msg);
1344 if (context->log_prefix)
1346 DBusString full_msg;
1348 if (!_dbus_string_init (&full_msg))
1350 if (!_dbus_string_append (&full_msg, context->log_prefix))
1352 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1355 _dbus_system_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1357 _dbus_string_free (&full_msg);
1360 _dbus_system_logv (severity, msg, args);
1366 static inline const char *
1367 nonnull (const char *maybe_null,
1368 const char *if_null)
1370 return (maybe_null ? maybe_null : if_null);
1374 * Log something about a message, usually that it was rejected.
1377 complain_about_message (BusContext *context,
1378 const char *error_name,
1379 const char *complaint,
1381 DBusMessage *message,
1382 DBusConnection *sender,
1383 DBusConnection *proposed_recipient,
1384 dbus_bool_t requested_reply,
1388 DBusError stack_error = DBUS_ERROR_INIT;
1389 const char *sender_name;
1390 const char *sender_loginfo;
1391 const char *proposed_recipient_loginfo;
1393 if (error == NULL && !log)
1398 sender_name = bus_connection_get_name (sender);
1399 sender_loginfo = bus_connection_get_loginfo (sender);
1403 sender_name = "(unset)";
1404 sender_loginfo = "(bus)";
1407 if (proposed_recipient != NULL)
1408 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1410 proposed_recipient_loginfo = "bus";
1412 dbus_set_error (&stack_error, error_name,
1413 "%s, %d matched rules; type=\"%s\", sender=\"%s\" (%s) "
1414 "interface=\"%s\" member=\"%s\" error name=\"%s\" "
1415 "requested_reply=\"%d\" destination=\"%s\" (%s)",
1418 dbus_message_type_to_string (dbus_message_get_type (message)),
1421 nonnull (dbus_message_get_interface (message), "(unset)"),
1422 nonnull (dbus_message_get_member (message), "(unset)"),
1423 nonnull (dbus_message_get_error_name (message), "(unset)"),
1425 nonnull (dbus_message_get_destination (message), DBUS_SERVICE_DBUS),
1426 proposed_recipient_loginfo);
1428 /* If we hit OOM while setting the error, this will syslog "out of memory"
1429 * which is itself an indication that something is seriously wrong */
1431 bus_context_log (context, DBUS_SYSTEM_LOG_SECURITY, "%s",
1432 stack_error.message);
1434 dbus_move_error (&stack_error, error);
1438 * addressed_recipient is the recipient specified in the message.
1440 * proposed_recipient is the recipient we're considering sending
1441 * to right this second, and may be an eavesdropper.
1443 * sender is the sender of the message.
1445 * NULL for proposed_recipient or sender definitely means the bus driver.
1447 * NULL for addressed_recipient may mean the bus driver, or may mean
1448 * no destination was specified in the message (e.g. a signal).
1451 bus_context_check_security_policy (BusContext *context,
1452 BusTransaction *transaction,
1453 DBusConnection *sender,
1454 DBusConnection *addressed_recipient,
1455 DBusConnection *proposed_recipient,
1456 DBusMessage *message,
1460 BusClientPolicy *sender_policy;
1461 BusClientPolicy *recipient_policy;
1462 dbus_int32_t toggles;
1465 dbus_bool_t requested_reply;
1467 type = dbus_message_get_type (message);
1468 dest = dbus_message_get_destination (message);
1470 /* dispatch.c was supposed to ensure these invariants */
1471 _dbus_assert (dest != NULL ||
1472 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1473 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1474 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1475 addressed_recipient != NULL ||
1476 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1480 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1481 case DBUS_MESSAGE_TYPE_SIGNAL:
1482 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1483 case DBUS_MESSAGE_TYPE_ERROR:
1487 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1490 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1491 "Message bus will not accept messages of unknown type\n");
1496 requested_reply = FALSE;
1500 /* First verify the SELinux access controls. If allowed then
1501 * go on with the standard checks.
1503 if (!bus_selinux_allows_send (sender, proposed_recipient,
1504 dbus_message_type_to_string (dbus_message_get_type (message)),
1505 dbus_message_get_interface (message),
1506 dbus_message_get_member (message),
1507 dbus_message_get_error_name (message),
1508 dest ? dest : DBUS_SERVICE_DBUS, error))
1510 if (error != NULL && !dbus_error_is_set (error))
1512 /* don't syslog this, just set the error: avc_has_perm should
1513 * have already written to either the audit log or syslog */
1514 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1515 "An SELinux policy prevents this sender from sending this "
1516 "message to this recipient",
1517 0, message, sender, proposed_recipient, FALSE, FALSE, error);
1518 _dbus_verbose ("SELinux security check denying send to service\n");
1524 if (bus_connection_is_active (sender))
1526 sender_policy = bus_connection_get_policy (sender);
1527 _dbus_assert (sender_policy != NULL);
1529 /* Fill in requested_reply variable with TRUE if this is a
1530 * reply and the reply was pending.
1532 if (dbus_message_get_reply_serial (message) != 0)
1534 if (proposed_recipient != NULL /* not to the bus driver */ &&
1535 addressed_recipient == proposed_recipient /* not eavesdropping */)
1539 dbus_error_init (&error2);
1540 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1542 sender, addressed_recipient, message,
1544 if (dbus_error_is_set (&error2))
1546 dbus_move_error (&error2, error);
1554 /* Policy for inactive connections is that they can only send
1555 * the hello message to the bus driver
1557 if (proposed_recipient == NULL &&
1558 dbus_message_is_method_call (message,
1559 DBUS_INTERFACE_DBUS,
1562 _dbus_verbose ("security check allowing %s message\n",
1568 _dbus_verbose ("security check disallowing non-%s message\n",
1571 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1572 "Client tried to send a message other than %s without being registered",
1581 sender_policy = NULL;
1583 /* If the sender is the bus driver, we assume any reply was a
1584 * requested reply as bus driver won't send bogus ones
1586 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1587 dbus_message_get_reply_serial (message) != 0)
1588 requested_reply = TRUE;
1591 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1592 (sender == NULL && sender_policy == NULL));
1594 if (proposed_recipient != NULL)
1596 /* only the bus driver can send to an inactive recipient (as it
1597 * owns no services, so other apps can't address it). Inactive
1598 * recipients can receive any message.
1600 if (bus_connection_is_active (proposed_recipient))
1602 recipient_policy = bus_connection_get_policy (proposed_recipient);
1603 _dbus_assert (recipient_policy != NULL);
1605 else if (sender == NULL)
1607 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1608 recipient_policy = NULL;
1612 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus\n");
1613 recipient_policy = NULL;
1617 recipient_policy = NULL;
1619 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1620 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1621 (proposed_recipient == NULL && recipient_policy == NULL));
1624 if (sender_policy &&
1625 !bus_client_policy_check_can_send (sender_policy,
1629 message, &toggles, &log))
1631 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1632 "Rejected send message", toggles,
1633 message, sender, proposed_recipient, requested_reply,
1634 (addressed_recipient == proposed_recipient), error);
1635 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1641 /* We want to drop this message, and are only not doing so for backwards
1643 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1644 "Would reject message", toggles,
1645 message, sender, proposed_recipient, requested_reply,
1649 if (recipient_policy &&
1650 !bus_client_policy_check_can_receive (recipient_policy,
1654 addressed_recipient, proposed_recipient,
1657 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1658 "Rejected receive message", toggles,
1659 message, sender, proposed_recipient, requested_reply,
1660 (addressed_recipient == proposed_recipient), NULL);
1661 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1665 /* See if limits on size have been exceeded */
1666 if (proposed_recipient &&
1667 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1668 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1670 complain_about_message (context, DBUS_ERROR_LIMITS_EXCEEDED,
1671 "Rejected: destination has a full message queue",
1672 0, message, sender, proposed_recipient, requested_reply, TRUE,
1674 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1678 /* Record that we will allow a reply here in the future (don't
1679 * bother if the recipient is the bus or this is an eavesdropping
1680 * connection). Only the addressed recipient may reply.
1682 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1684 addressed_recipient &&
1685 addressed_recipient == proposed_recipient && /* not eavesdropping */
1686 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1688 sender, addressed_recipient,
1691 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1695 _dbus_verbose ("security policy allowing message\n");