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 = empty_server_init(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)
470 server = dbus_server_listen (_dbus_string_get_const_data(address), error);
473 _DBUS_ASSERT_ERROR_IS_SET (error);
476 else if (!setup_server (context, server, auth_mechanisms, error))
478 _DBUS_ASSERT_ERROR_IS_SET (error);
482 if (!_dbus_list_append (&context->servers, server))
488 addresses = bus_config_parser_get_addresses (parser);
490 link = _dbus_list_get_first_link (addresses);
495 server = dbus_server_listen (link->data, error);
498 _DBUS_ASSERT_ERROR_IS_SET (error);
501 else if (!setup_server (context, server, auth_mechanisms, error))
503 _DBUS_ASSERT_ERROR_IS_SET (error);
507 if (!_dbus_list_append (&context->servers, server))
510 link = _dbus_list_get_next_link (addresses, link);
514 context->fork = bus_config_parser_get_fork (parser);
515 context->syslog = bus_config_parser_get_syslog (parser);
516 context->keep_umask = bus_config_parser_get_keep_umask (parser);
517 context->allow_anonymous = bus_config_parser_get_allow_anonymous (parser);
519 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
523 dbus_free_string_array (auth_mechanisms);
528 dbus_free_string_array (auth_mechanisms);
532 /* This code gets executed every time the config files
533 * are parsed: both during BusContext construction
534 * and on reloads. This function is slightly screwy
535 * since it can do a "half reload" in out-of-memory
536 * situations. Realistically, unlikely to ever matter.
539 process_config_every_time (BusContext *context,
540 BusConfigParser *parser,
541 dbus_bool_t is_reload,
544 DBusString full_address;
548 const char *servicehelper;
553 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
558 if (!_dbus_string_init (&full_address))
564 /* get our limits and timeout lengths */
565 bus_config_parser_get_limits (parser, &context->limits);
568 bus_policy_unref (context->policy);
569 context->policy = bus_config_parser_steal_policy (parser);
570 _dbus_assert (context->policy != NULL);
572 /* We have to build the address backward, so that
573 * <listen> later in the config file have priority
575 link = _dbus_list_get_last_link (&context->servers);
578 addr = dbus_server_get_address (link->data);
585 if (_dbus_string_get_length (&full_address) > 0)
587 if (!_dbus_string_append (&full_address, ";"))
594 if (!_dbus_string_append (&full_address, addr))
603 link = _dbus_list_get_prev_link (&context->servers, link);
607 dbus_free (context->address);
609 if (!_dbus_string_copy_data (&full_address, &context->address))
615 /* get the service directories */
616 dirs = bus_config_parser_get_service_dirs (parser);
618 /* and the service helper */
619 servicehelper = bus_config_parser_get_servicehelper (parser);
621 s = _dbus_strdup(servicehelper);
622 if (s == NULL && servicehelper != NULL)
629 dbus_free(context->servicehelper);
630 context->servicehelper = s;
633 /* Create activation subsystem */
634 if (context->activation)
636 if (!bus_activation_reload (context->activation, &full_address, dirs, error))
641 context->activation = bus_activation_new (context, &full_address, dirs, error);
644 if (context->activation == NULL)
646 _DBUS_ASSERT_ERROR_IS_SET (error);
650 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
654 _dbus_string_free (&full_address);
663 list_concat_new (DBusList **a,
671 for (link = _dbus_list_get_first_link (a); link; link = _dbus_list_get_next_link (a, link))
673 if (!_dbus_list_append (result, link->data))
676 for (link = _dbus_list_get_first_link (b); link; link = _dbus_list_get_next_link (b, link))
678 if (!_dbus_list_append (result, link->data))
684 _dbus_list_clear (result);
689 raise_file_descriptor_limit (BusContext *context)
692 /* I just picked this out of thin air; we need some extra
693 * descriptors for things like any internal pipes we create,
694 * inotify, connections to SELinux, etc.
696 unsigned int arbitrary_extra_fds = 32;
699 limit = context->limits.max_completed_connections +
700 context->limits.max_incomplete_connections
701 + arbitrary_extra_fds;
703 _dbus_request_file_descriptor_limit (limit);
707 process_config_postinit (BusContext *context,
708 BusConfigParser *parser,
711 DBusHashTable *service_context_table;
712 DBusList *watched_dirs = NULL;
714 raise_file_descriptor_limit (context);
716 service_context_table = bus_config_parser_steal_service_context_table (parser);
717 if (!bus_registry_set_service_context_table (context->registry,
718 service_context_table))
724 _dbus_hash_table_unref (service_context_table);
726 /* We need to monitor both the configuration directories and directories
727 * containing .service files.
729 if (!list_concat_new (bus_config_parser_get_conf_dirs (parser),
730 bus_config_parser_get_service_dirs (parser),
737 bus_set_watched_dirs (context, &watched_dirs);
739 _dbus_list_clear (&watched_dirs);
745 bus_context_new (const DBusString *config_file,
746 BusContextFlags flags,
747 DBusPipe *print_addr_pipe,
748 DBusPipe *print_pid_pipe,
749 const DBusString *address,
753 BusConfigParser *parser;
755 _dbus_assert ((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 ||
756 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS) == 0);
758 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
763 if (!dbus_server_allocate_data_slot (&server_data_slot))
769 context = dbus_new0 (BusContext, 1);
775 context->refcount = 1;
777 _dbus_generate_uuid (&context->uuid);
779 if (!_dbus_string_copy_data (config_file, &context->config_file))
785 context->loop = _dbus_loop_new ();
786 if (context->loop == NULL)
792 context->registry = bus_registry_new (context);
793 if (context->registry == NULL)
799 parser = bus_config_load (config_file, TRUE, NULL, error);
802 _DBUS_ASSERT_ERROR_IS_SET (error);
806 if (!process_config_first_time_only (context, parser, address, flags, error))
808 _DBUS_ASSERT_ERROR_IS_SET (error);
811 if (!process_config_every_time (context, parser, FALSE, error))
813 _DBUS_ASSERT_ERROR_IS_SET (error);
817 /* we need another ref of the server data slot for the context
820 if (!dbus_server_allocate_data_slot (&server_data_slot))
821 _dbus_assert_not_reached ("second ref of server data slot failed");
823 /* Note that we don't know whether the print_addr_pipe is
824 * one of the sockets we're using to listen on, or some
825 * other random thing. But I think the answer is "don't do
828 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
831 const char *a = bus_context_get_address (context);
834 _dbus_assert (a != NULL);
835 if (!_dbus_string_init (&addr))
841 if (!_dbus_string_append (&addr, a) ||
842 !_dbus_string_append (&addr, "\n"))
844 _dbus_string_free (&addr);
849 bytes = _dbus_string_get_length (&addr);
850 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
852 /* pipe write returns an error on failure but not short write */
853 if (error != NULL && !dbus_error_is_set (error))
855 dbus_set_error (error, DBUS_ERROR_FAILED,
856 "Printing message bus address: did not write all bytes\n");
858 _dbus_string_free (&addr);
862 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
863 _dbus_pipe_close (print_addr_pipe, NULL);
865 _dbus_string_free (&addr);
868 context->connections = bus_connections_new (context);
869 if (context->connections == NULL)
875 context->matchmaker = bus_matchmaker_new ();
876 if (context->matchmaker == NULL)
882 /* check user before we fork */
883 if (context->user != NULL)
885 if (!_dbus_verify_daemon_user (context->user))
887 dbus_set_error (error, DBUS_ERROR_FAILED,
888 "Could not get UID and GID for username \"%s\"",
894 /* Now become a daemon if appropriate and write out pid file in any case */
898 if (context->pidfile)
899 _dbus_string_init_const (&u, context->pidfile);
901 if (((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 && context->fork) ||
902 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS))
904 _dbus_verbose ("Forking and becoming daemon\n");
906 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
909 context->keep_umask))
911 _DBUS_ASSERT_ERROR_IS_SET (error);
917 _dbus_verbose ("Fork not requested\n");
919 /* Need to write PID file and to PID pipe for ourselves,
920 * not for the child process. This is a no-op if the pidfile
921 * is NULL and print_pid_pipe is NULL.
923 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
928 _DBUS_ASSERT_ERROR_IS_SET (error);
934 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
935 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
936 _dbus_pipe_close (print_pid_pipe, NULL);
938 if (!bus_selinux_full_init ())
940 bus_context_log (context, DBUS_SYSTEM_LOG_FATAL, "SELinux enabled but AVC initialization failed; check system log\n");
943 if (!process_config_postinit (context, parser, error))
945 _DBUS_ASSERT_ERROR_IS_SET (error);
951 bus_config_parser_unref (parser);
955 /* Here we change our credentials if required,
956 * as soon as we've set up our sockets and pidfile
958 if (context->user != NULL)
960 if (!_dbus_change_to_daemon_user (context->user, error))
962 _DBUS_ASSERT_ERROR_IS_SET (error);
967 /* FIXME - why not just put this in full_init() below? */
968 bus_selinux_audit_init ();
972 dbus_server_free_data_slot (&server_data_slot);
974 if(context->myConnection)
976 DBusString unique_name;
978 bus_connections_setup_connection(context->connections, context->myConnection);
979 _dbus_string_init_const(&unique_name, ":1.1");
980 if(!bus_connection_complete(context->myConnection, &unique_name, error))
982 _dbus_verbose ("bus connection complete failed\n");
990 bus_config_parser_unref (parser);
992 bus_context_unref (context);
994 if (server_data_slot >= 0)
995 dbus_server_free_data_slot (&server_data_slot);
1001 bus_context_get_id (BusContext *context,
1004 return _dbus_uuid_encode (&context->uuid, uuid);
1008 bus_context_reload_config (BusContext *context,
1011 BusConfigParser *parser;
1012 DBusString config_file;
1015 /* Flush the user database cache */
1016 _dbus_flush_caches ();
1019 _dbus_string_init_const (&config_file, context->config_file);
1020 parser = bus_config_load (&config_file, TRUE, NULL, error);
1023 _DBUS_ASSERT_ERROR_IS_SET (error);
1027 if (!process_config_every_time (context, parser, TRUE, error))
1029 _DBUS_ASSERT_ERROR_IS_SET (error);
1032 if (!process_config_postinit (context, parser, error))
1034 _DBUS_ASSERT_ERROR_IS_SET (error);
1039 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
1042 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
1044 bus_config_parser_unref (parser);
1049 shutdown_server (BusContext *context,
1052 if (server == NULL ||
1053 !dbus_server_get_is_connected (server))
1056 if (!dbus_server_set_watch_functions (server,
1060 _dbus_assert_not_reached ("setting watch functions to NULL failed");
1062 if (!dbus_server_set_timeout_functions (server,
1066 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
1068 dbus_server_disconnect (server);
1072 bus_context_shutdown (BusContext *context)
1076 link = _dbus_list_get_first_link (&context->servers);
1077 while (link != NULL)
1079 shutdown_server (context, link->data);
1081 link = _dbus_list_get_next_link (&context->servers, link);
1086 bus_context_ref (BusContext *context)
1088 _dbus_assert (context->refcount > 0);
1089 context->refcount += 1;
1095 bus_context_unref (BusContext *context)
1097 _dbus_assert (context->refcount > 0);
1098 context->refcount -= 1;
1100 if (context->refcount == 0)
1104 _dbus_verbose ("Finalizing bus context %p\n", context);
1106 bus_context_shutdown (context);
1108 if (context->connections)
1110 bus_connections_unref (context->connections);
1111 context->connections = NULL;
1114 if (context->registry)
1116 bus_registry_unref (context->registry);
1117 context->registry = NULL;
1120 if (context->activation)
1122 bus_activation_unref (context->activation);
1123 context->activation = NULL;
1126 link = _dbus_list_get_first_link (&context->servers);
1127 while (link != NULL)
1129 dbus_server_unref (link->data);
1131 link = _dbus_list_get_next_link (&context->servers, link);
1133 _dbus_list_clear (&context->servers);
1135 if (context->policy)
1137 bus_policy_unref (context->policy);
1138 context->policy = NULL;
1143 _dbus_loop_unref (context->loop);
1144 context->loop = NULL;
1147 if (context->matchmaker)
1149 bus_matchmaker_unref (context->matchmaker);
1150 context->matchmaker = NULL;
1153 dbus_free (context->config_file);
1154 dbus_free (context->log_prefix);
1155 dbus_free (context->type);
1156 dbus_free (context->address);
1157 dbus_free (context->user);
1158 dbus_free (context->servicehelper);
1160 if (context->pidfile)
1163 _dbus_string_init_const (&u, context->pidfile);
1165 /* Deliberately ignore errors here, since there's not much
1166 * we can do about it, and we're exiting anyways.
1168 _dbus_delete_file (&u, NULL);
1170 dbus_free (context->pidfile);
1172 dbus_free (context);
1174 dbus_server_free_data_slot (&server_data_slot);
1178 /* type may be NULL */
1180 bus_context_get_type (BusContext *context)
1182 return context->type;
1186 bus_context_get_address (BusContext *context)
1188 return context->address;
1192 bus_context_get_servicehelper (BusContext *context)
1194 return context->servicehelper;
1198 bus_context_get_systemd_activation (BusContext *context)
1200 return context->systemd_activation;
1204 bus_context_get_registry (BusContext *context)
1206 return context->registry;
1210 bus_context_get_connections (BusContext *context)
1212 return context->connections;
1216 bus_context_get_activation (BusContext *context)
1218 return context->activation;
1222 bus_context_get_matchmaker (BusContext *context)
1224 return context->matchmaker;
1228 bus_context_get_loop (BusContext *context)
1230 return context->loop;
1233 DBusConnection* bus_context_get_myConnection(BusContext *context)
1235 return context->myConnection;
1239 bus_context_allow_unix_user (BusContext *context,
1242 return bus_policy_allow_unix_user (context->policy,
1246 /* For now this is never actually called because the default
1247 * DBusConnection behavior of 'same user that owns the bus can connect'
1248 * is all it would do.
1251 bus_context_allow_windows_user (BusContext *context,
1252 const char *windows_sid)
1254 return bus_policy_allow_windows_user (context->policy,
1259 bus_context_get_policy (BusContext *context)
1261 return context->policy;
1265 bus_context_create_client_policy (BusContext *context,
1266 DBusConnection *connection,
1269 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1270 return bus_policy_create_client_policy (context->policy, connection,
1275 bus_context_get_activation_timeout (BusContext *context)
1278 return context->limits.activation_timeout;
1282 bus_context_get_auth_timeout (BusContext *context)
1284 return context->limits.auth_timeout;
1288 bus_context_get_max_completed_connections (BusContext *context)
1290 return context->limits.max_completed_connections;
1294 bus_context_get_max_incomplete_connections (BusContext *context)
1296 return context->limits.max_incomplete_connections;
1300 bus_context_get_max_connections_per_user (BusContext *context)
1302 return context->limits.max_connections_per_user;
1306 bus_context_get_max_pending_activations (BusContext *context)
1308 return context->limits.max_pending_activations;
1312 bus_context_get_max_services_per_connection (BusContext *context)
1314 return context->limits.max_services_per_connection;
1318 bus_context_get_max_match_rules_per_connection (BusContext *context)
1320 return context->limits.max_match_rules_per_connection;
1324 bus_context_get_max_replies_per_connection (BusContext *context)
1326 return context->limits.max_replies_per_connection;
1330 bus_context_get_reply_timeout (BusContext *context)
1332 return context->limits.reply_timeout;
1336 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...) _DBUS_GNUC_PRINTF (3, 4);
1339 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1343 if (!context->syslog)
1345 /* we're not syslogging; just output to stderr */
1346 va_start (args, msg);
1347 vfprintf (stderr, msg, args);
1348 fprintf (stderr, "\n");
1353 va_start (args, msg);
1355 if (context->log_prefix)
1357 DBusString full_msg;
1359 if (!_dbus_string_init (&full_msg))
1361 if (!_dbus_string_append (&full_msg, context->log_prefix))
1363 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1366 _dbus_system_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1368 _dbus_string_free (&full_msg);
1371 _dbus_system_logv (severity, msg, args);
1377 static inline const char *
1378 nonnull (const char *maybe_null,
1379 const char *if_null)
1381 return (maybe_null ? maybe_null : if_null);
1385 * Log something about a message, usually that it was rejected.
1388 complain_about_message (BusContext *context,
1389 const char *error_name,
1390 const char *complaint,
1392 DBusMessage *message,
1393 DBusConnection *sender,
1394 DBusConnection *proposed_recipient,
1395 dbus_bool_t requested_reply,
1399 DBusError stack_error = DBUS_ERROR_INIT;
1400 const char *sender_name;
1401 const char *sender_loginfo;
1402 const char *proposed_recipient_loginfo;
1404 if (error == NULL && !log)
1409 sender_name = bus_connection_get_name (sender);
1410 sender_loginfo = bus_connection_get_loginfo (sender);
1414 sender_name = "(unset)";
1415 sender_loginfo = "(bus)";
1418 if (proposed_recipient != NULL)
1419 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1421 proposed_recipient_loginfo = "bus";
1423 dbus_set_error (&stack_error, error_name,
1424 "%s, %d matched rules; type=\"%s\", sender=\"%s\" (%s) "
1425 "interface=\"%s\" member=\"%s\" error name=\"%s\" "
1426 "requested_reply=\"%d\" destination=\"%s\" (%s)",
1429 dbus_message_type_to_string (dbus_message_get_type (message)),
1432 nonnull (dbus_message_get_interface (message), "(unset)"),
1433 nonnull (dbus_message_get_member (message), "(unset)"),
1434 nonnull (dbus_message_get_error_name (message), "(unset)"),
1436 nonnull (dbus_message_get_destination (message), DBUS_SERVICE_DBUS),
1437 proposed_recipient_loginfo);
1439 /* If we hit OOM while setting the error, this will syslog "out of memory"
1440 * which is itself an indication that something is seriously wrong */
1442 bus_context_log (context, DBUS_SYSTEM_LOG_SECURITY, "%s",
1443 stack_error.message);
1445 dbus_move_error (&stack_error, error);
1449 * addressed_recipient is the recipient specified in the message.
1451 * proposed_recipient is the recipient we're considering sending
1452 * to right this second, and may be an eavesdropper.
1454 * sender is the sender of the message.
1456 * NULL for proposed_recipient or sender definitely means the bus driver.
1458 * NULL for addressed_recipient may mean the bus driver, or may mean
1459 * no destination was specified in the message (e.g. a signal).
1462 bus_context_check_security_policy (BusContext *context,
1463 BusTransaction *transaction,
1464 DBusConnection *sender,
1465 DBusConnection *addressed_recipient,
1466 DBusConnection *proposed_recipient,
1467 DBusMessage *message,
1471 BusClientPolicy *sender_policy;
1472 BusClientPolicy *recipient_policy;
1473 dbus_int32_t toggles;
1476 dbus_bool_t requested_reply;
1478 type = dbus_message_get_type (message);
1479 dest = dbus_message_get_destination (message);
1481 /* dispatch.c was supposed to ensure these invariants */
1482 _dbus_assert (dest != NULL ||
1483 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1484 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1485 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1486 addressed_recipient != NULL ||
1487 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1491 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1492 case DBUS_MESSAGE_TYPE_SIGNAL:
1493 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1494 case DBUS_MESSAGE_TYPE_ERROR:
1498 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1501 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1502 "Message bus will not accept messages of unknown type\n");
1507 requested_reply = FALSE;
1511 /* First verify the SELinux access controls. If allowed then
1512 * go on with the standard checks.
1514 if (!bus_selinux_allows_send (sender, proposed_recipient,
1515 dbus_message_type_to_string (dbus_message_get_type (message)),
1516 dbus_message_get_interface (message),
1517 dbus_message_get_member (message),
1518 dbus_message_get_error_name (message),
1519 dest ? dest : DBUS_SERVICE_DBUS, error))
1521 if (error != NULL && !dbus_error_is_set (error))
1523 /* don't syslog this, just set the error: avc_has_perm should
1524 * have already written to either the audit log or syslog */
1525 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1526 "An SELinux policy prevents this sender from sending this "
1527 "message to this recipient",
1528 0, message, sender, proposed_recipient, FALSE, FALSE, error);
1529 _dbus_verbose ("SELinux security check denying send to service\n");
1535 if (bus_connection_is_active (sender))
1537 sender_policy = bus_connection_get_policy (sender);
1538 _dbus_assert (sender_policy != NULL);
1540 /* Fill in requested_reply variable with TRUE if this is a
1541 * reply and the reply was pending.
1543 if (dbus_message_get_reply_serial (message) != 0)
1545 if (proposed_recipient != NULL /* not to the bus driver */ &&
1546 addressed_recipient == proposed_recipient /* not eavesdropping */)
1550 dbus_error_init (&error2);
1551 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1553 sender, addressed_recipient, message,
1555 if (dbus_error_is_set (&error2))
1557 dbus_move_error (&error2, error);
1565 /* Policy for inactive connections is that they can only send
1566 * the hello message to the bus driver
1568 if (proposed_recipient == NULL &&
1569 dbus_message_is_method_call (message,
1570 DBUS_INTERFACE_DBUS,
1573 _dbus_verbose ("security check allowing %s message\n",
1579 _dbus_verbose ("security check disallowing non-%s message\n",
1582 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1583 "Client tried to send a message other than %s without being registered",
1592 sender_policy = NULL;
1594 /* If the sender is the bus driver, we assume any reply was a
1595 * requested reply as bus driver won't send bogus ones
1597 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1598 dbus_message_get_reply_serial (message) != 0)
1599 requested_reply = TRUE;
1602 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1603 (sender == NULL && sender_policy == NULL));
1605 if (proposed_recipient != NULL)
1607 /* only the bus driver can send to an inactive recipient (as it
1608 * owns no services, so other apps can't address it). Inactive
1609 * recipients can receive any message.
1611 if (bus_connection_is_active (proposed_recipient))
1613 recipient_policy = bus_connection_get_policy (proposed_recipient);
1614 _dbus_assert (recipient_policy != NULL);
1616 else if (sender == NULL)
1618 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1619 recipient_policy = NULL;
1623 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus\n");
1624 recipient_policy = NULL;
1628 recipient_policy = NULL;
1630 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1631 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1632 (proposed_recipient == NULL && recipient_policy == NULL));
1635 if (sender_policy &&
1636 !bus_client_policy_check_can_send (sender_policy,
1640 message, &toggles, &log))
1642 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1643 "Rejected send message", toggles,
1644 message, sender, proposed_recipient, requested_reply,
1645 (addressed_recipient == proposed_recipient), error);
1646 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1652 /* We want to drop this message, and are only not doing so for backwards
1654 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1655 "Would reject message", toggles,
1656 message, sender, proposed_recipient, requested_reply,
1660 if (recipient_policy &&
1661 !bus_client_policy_check_can_receive (recipient_policy,
1665 addressed_recipient, proposed_recipient,
1668 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1669 "Rejected receive message", toggles,
1670 message, sender, proposed_recipient, requested_reply,
1671 (addressed_recipient == proposed_recipient), NULL);
1672 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1676 /* See if limits on size have been exceeded */
1677 if (proposed_recipient &&
1678 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1679 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1681 complain_about_message (context, DBUS_ERROR_LIMITS_EXCEEDED,
1682 "Rejected: destination has a full message queue",
1683 0, message, sender, proposed_recipient, requested_reply, TRUE,
1685 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1689 /* Record that we will allow a reply here in the future (don't
1690 * bother if the recipient is the bus or this is an eavesdropping
1691 * connection). Only the addressed recipient may reply.
1693 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1695 addressed_recipient &&
1696 addressed_recipient == proposed_recipient && /* not eavesdropping */
1697 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1699 sender, addressed_recipient,
1702 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1706 _dbus_verbose ("security policy allowing message\n");