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>
61 BusConnections *connections;
62 BusActivation *activation;
63 BusRegistry *registry;
65 BusMatchmaker *matchmaker;
67 unsigned int fork : 1;
68 unsigned int syslog : 1;
69 unsigned int keep_umask : 1;
70 unsigned int allow_anonymous : 1;
71 unsigned int systemd_activation : 1;
72 unsigned int is_kdbus : 1;
73 DBusConnection *myConnection;
76 static dbus_int32_t server_data_slot = -1;
83 #define BUS_SERVER_DATA(server) (dbus_server_get_data ((server), server_data_slot))
86 server_get_context (DBusServer *server)
91 if (!dbus_server_allocate_data_slot (&server_data_slot))
94 bd = BUS_SERVER_DATA (server);
97 dbus_server_free_data_slot (&server_data_slot);
101 context = bd->context;
103 dbus_server_free_data_slot (&server_data_slot);
109 add_server_watch (DBusWatch *watch,
112 DBusServer *server = data;
115 context = server_get_context (server);
117 return _dbus_loop_add_watch (context->loop, watch);
121 remove_server_watch (DBusWatch *watch,
124 DBusServer *server = data;
127 context = server_get_context (server);
129 _dbus_loop_remove_watch (context->loop, watch);
133 toggle_server_watch (DBusWatch *watch,
136 DBusServer *server = data;
139 context = server_get_context (server);
141 _dbus_loop_toggle_watch (context->loop, watch);
145 add_server_timeout (DBusTimeout *timeout,
148 DBusServer *server = data;
151 context = server_get_context (server);
153 return _dbus_loop_add_timeout (context->loop, timeout);
157 remove_server_timeout (DBusTimeout *timeout,
160 DBusServer *server = data;
163 context = server_get_context (server);
165 _dbus_loop_remove_timeout (context->loop, timeout);
169 new_connection_callback (DBusServer *server,
170 DBusConnection *new_connection,
173 BusContext *context = data;
175 if (!bus_connections_setup_connection (context->connections, new_connection))
177 _dbus_verbose ("No memory to setup new connection\n");
179 /* if we don't do this, it will get unref'd without
180 * being disconnected... kind of strange really
181 * that we have to do this, people won't get it right
184 dbus_connection_close (new_connection);
187 dbus_connection_set_max_received_size (new_connection,
188 context->limits.max_incoming_bytes);
190 dbus_connection_set_max_message_size (new_connection,
191 context->limits.max_message_size);
193 dbus_connection_set_max_received_unix_fds (new_connection,
194 context->limits.max_incoming_unix_fds);
196 dbus_connection_set_max_message_unix_fds (new_connection,
197 context->limits.max_message_unix_fds);
199 dbus_connection_set_allow_anonymous (new_connection,
200 context->allow_anonymous);
202 /* on OOM, we won't have ref'd the connection so it will die. */
206 free_server_data (void *data)
208 BusServerData *bd = data;
214 setup_server (BusContext *context,
216 char **auth_mechanisms,
221 bd = dbus_new0 (BusServerData, 1);
222 if (bd == NULL || !dbus_server_set_data (server,
224 bd, free_server_data))
231 bd->context = context;
233 if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms))
239 dbus_server_set_new_connection_function (server,
240 new_connection_callback,
243 if (!dbus_server_set_watch_functions (server,
254 if (!dbus_server_set_timeout_functions (server,
256 remove_server_timeout,
267 /* This code only gets executed the first time the
268 * config files are parsed. It is not executed
269 * when config files are reloaded.
272 process_config_first_time_only (BusContext *context,
273 BusConfigParser *parser,
274 const DBusString *address,
275 BusContextFlags flags,
278 DBusString log_prefix;
280 DBusList **addresses;
281 const char *user, *pidfile;
282 char **auth_mechanisms;
283 DBusList **auth_mechanisms_list;
287 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
290 auth_mechanisms = NULL;
293 _dbus_init_system_log (TRUE);
295 if (flags & BUS_CONTEXT_FLAG_SYSTEMD_ACTIVATION)
296 context->systemd_activation = TRUE;
298 context->systemd_activation = FALSE;
300 /* Check for an existing pid file. Of course this is a race;
301 * we'd have to use fcntl() locks on the pid file to
302 * avoid that. But we want to check for the pid file
303 * before overwriting any existing sockets, etc.
306 if (flags & BUS_CONTEXT_FLAG_WRITE_PID_FILE)
307 pidfile = bus_config_parser_get_pidfile (parser);
314 _dbus_string_init_const (&u, pidfile);
316 if (_dbus_stat (&u, &stbuf, NULL))
322 _dbus_string_init (&p);
323 _dbus_file_get_contents(&p, &u, NULL);
324 _dbus_string_parse_int(&p, 0, &pid, NULL);
325 _dbus_string_free(&p);
327 if ((kill((int)pid, 0))) {
328 dbus_set_error(NULL, DBUS_ERROR_FILE_EXISTS,
329 "pid %ld not running, removing stale pid file\n",
331 _dbus_delete_file(&u, NULL);
334 dbus_set_error (error, DBUS_ERROR_FAILED,
335 "The pid file \"%s\" exists, if the message bus is not running, remove this file",
344 /* keep around the pid filename so we can delete it later */
345 context->pidfile = _dbus_strdup (pidfile);
347 /* note that type may be NULL */
348 context->type = _dbus_strdup (bus_config_parser_get_type (parser));
349 if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
352 user = bus_config_parser_get_user (parser);
355 context->user = _dbus_strdup (user);
356 if (context->user == NULL)
360 /* Set up the prefix for syslog messages */
361 if (!_dbus_string_init (&log_prefix))
363 if (context->type && !strcmp (context->type, "system"))
365 if (!_dbus_string_append (&log_prefix, "[system] "))
368 else if (context->type && !strcmp (context->type, "session"))
370 DBusCredentials *credentials;
372 credentials = _dbus_credentials_new_from_current_process ();
375 if (!_dbus_string_append (&log_prefix, "[session "))
377 _dbus_credentials_unref (credentials);
380 if (!_dbus_credentials_to_string_append (credentials, &log_prefix))
382 _dbus_credentials_unref (credentials);
385 if (!_dbus_string_append (&log_prefix, "] "))
387 _dbus_credentials_unref (credentials);
390 _dbus_credentials_unref (credentials);
392 if (!_dbus_string_steal_data (&log_prefix, &context->log_prefix))
394 _dbus_string_free (&log_prefix);
396 /* Build an array of auth mechanisms */
398 auth_mechanisms_list = bus_config_parser_get_mechanisms (parser);
399 len = _dbus_list_get_length (auth_mechanisms_list);
405 auth_mechanisms = dbus_new0 (char*, len + 1);
406 if (auth_mechanisms == NULL)
410 link = _dbus_list_get_first_link (auth_mechanisms_list);
413 auth_mechanisms[i] = _dbus_strdup (link->data);
414 if (auth_mechanisms[i] == NULL)
416 link = _dbus_list_get_next_link (auth_mechanisms_list, link);
422 auth_mechanisms = NULL;
425 /* Listen on our addresses */
429 if(!strcmp(_dbus_string_get_const_data(address), "kdbus"))
433 context->is_kdbus = TRUE;
435 if(!strcmp (context->type, "system"))
436 type = DBUS_BUS_SYSTEM;
437 else if(!strcmp (context->type, "session"))
438 type = DBUS_BUS_SESSION;
440 type = DBUS_BUS_STARTER;
442 if(!make_kdbus_bus(type, error))
445 context->myConnection = daemon_as_client(type, error);
446 if(context->myConnection == NULL)
453 server = dbus_server_listen (_dbus_string_get_const_data(address), error);
456 _DBUS_ASSERT_ERROR_IS_SET (error);
459 else if (!setup_server (context, server, auth_mechanisms, error))
461 _DBUS_ASSERT_ERROR_IS_SET (error);
465 if (!_dbus_list_append (&context->servers, server))
471 addresses = bus_config_parser_get_addresses (parser);
473 link = _dbus_list_get_first_link (addresses);
478 server = dbus_server_listen (link->data, error);
481 _DBUS_ASSERT_ERROR_IS_SET (error);
484 else if (!setup_server (context, server, auth_mechanisms, error))
486 _DBUS_ASSERT_ERROR_IS_SET (error);
490 if (!_dbus_list_append (&context->servers, server))
493 link = _dbus_list_get_next_link (addresses, link);
497 context->fork = bus_config_parser_get_fork (parser);
498 context->syslog = bus_config_parser_get_syslog (parser);
499 context->keep_umask = bus_config_parser_get_keep_umask (parser);
500 context->allow_anonymous = bus_config_parser_get_allow_anonymous (parser);
502 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
506 dbus_free_string_array (auth_mechanisms);
511 dbus_free_string_array (auth_mechanisms);
515 /* This code gets executed every time the config files
516 * are parsed: both during BusContext construction
517 * and on reloads. This function is slightly screwy
518 * since it can do a "half reload" in out-of-memory
519 * situations. Realistically, unlikely to ever matter.
522 process_config_every_time (BusContext *context,
523 BusConfigParser *parser,
524 dbus_bool_t is_reload,
527 DBusString full_address;
531 const char *servicehelper;
536 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
541 if (!_dbus_string_init (&full_address))
547 /* get our limits and timeout lengths */
548 bus_config_parser_get_limits (parser, &context->limits);
551 bus_policy_unref (context->policy);
552 context->policy = bus_config_parser_steal_policy (parser);
553 _dbus_assert (context->policy != NULL);
555 /* We have to build the address backward, so that
556 * <listen> later in the config file have priority
558 link = _dbus_list_get_last_link (&context->servers);
561 addr = dbus_server_get_address (link->data);
568 if (_dbus_string_get_length (&full_address) > 0)
570 if (!_dbus_string_append (&full_address, ";"))
577 if (!_dbus_string_append (&full_address, addr))
586 link = _dbus_list_get_prev_link (&context->servers, link);
590 dbus_free (context->address);
592 if (!_dbus_string_copy_data (&full_address, &context->address))
598 /* get the service directories */
599 dirs = bus_config_parser_get_service_dirs (parser);
601 /* and the service helper */
602 servicehelper = bus_config_parser_get_servicehelper (parser);
604 s = _dbus_strdup(servicehelper);
605 if (s == NULL && servicehelper != NULL)
612 dbus_free(context->servicehelper);
613 context->servicehelper = s;
616 /* Create activation subsystem */
617 if (context->activation)
619 if (!bus_activation_reload (context->activation, &full_address, dirs, error))
624 context->activation = bus_activation_new (context, &full_address, dirs, error);
627 if (context->activation == NULL)
629 _DBUS_ASSERT_ERROR_IS_SET (error);
633 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
637 _dbus_string_free (&full_address);
646 list_concat_new (DBusList **a,
654 for (link = _dbus_list_get_first_link (a); link; link = _dbus_list_get_next_link (a, link))
656 if (!_dbus_list_append (result, link->data))
659 for (link = _dbus_list_get_first_link (b); link; link = _dbus_list_get_next_link (b, link))
661 if (!_dbus_list_append (result, link->data))
667 _dbus_list_clear (result);
672 raise_file_descriptor_limit (BusContext *context)
675 /* I just picked this out of thin air; we need some extra
676 * descriptors for things like any internal pipes we create,
677 * inotify, connections to SELinux, etc.
679 unsigned int arbitrary_extra_fds = 32;
682 limit = context->limits.max_completed_connections +
683 context->limits.max_incomplete_connections
684 + arbitrary_extra_fds;
686 _dbus_request_file_descriptor_limit (limit);
690 process_config_postinit (BusContext *context,
691 BusConfigParser *parser,
694 DBusHashTable *service_context_table;
695 DBusList *watched_dirs = NULL;
697 raise_file_descriptor_limit (context);
699 service_context_table = bus_config_parser_steal_service_context_table (parser);
700 if (!bus_registry_set_service_context_table (context->registry,
701 service_context_table))
707 _dbus_hash_table_unref (service_context_table);
709 /* We need to monitor both the configuration directories and directories
710 * containing .service files.
712 if (!list_concat_new (bus_config_parser_get_conf_dirs (parser),
713 bus_config_parser_get_service_dirs (parser),
720 bus_set_watched_dirs (context, &watched_dirs);
722 _dbus_list_clear (&watched_dirs);
728 bus_context_new (const DBusString *config_file,
729 BusContextFlags flags,
730 DBusPipe *print_addr_pipe,
731 DBusPipe *print_pid_pipe,
732 const DBusString *address,
736 BusConfigParser *parser;
738 _dbus_assert ((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 ||
739 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS) == 0);
741 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
746 if (!dbus_server_allocate_data_slot (&server_data_slot))
752 context = dbus_new0 (BusContext, 1);
758 context->refcount = 1;
760 _dbus_generate_uuid (&context->uuid);
762 if (!_dbus_string_copy_data (config_file, &context->config_file))
768 context->loop = _dbus_loop_new ();
769 if (context->loop == NULL)
775 context->registry = bus_registry_new (context);
776 if (context->registry == NULL)
782 parser = bus_config_load (config_file, TRUE, NULL, error);
785 _DBUS_ASSERT_ERROR_IS_SET (error);
789 if (!process_config_first_time_only (context, parser, address, flags, error))
791 _DBUS_ASSERT_ERROR_IS_SET (error);
794 if (!process_config_every_time (context, parser, FALSE, error))
796 _DBUS_ASSERT_ERROR_IS_SET (error);
800 /* we need another ref of the server data slot for the context
803 if (!dbus_server_allocate_data_slot (&server_data_slot))
804 _dbus_assert_not_reached ("second ref of server data slot failed");
806 /* Note that we don't know whether the print_addr_pipe is
807 * one of the sockets we're using to listen on, or some
808 * other random thing. But I think the answer is "don't do
811 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
814 const char *a = bus_context_get_address (context);
817 _dbus_assert (a != NULL);
818 if (!_dbus_string_init (&addr))
824 if (!_dbus_string_append (&addr, a) ||
825 !_dbus_string_append (&addr, "\n"))
827 _dbus_string_free (&addr);
832 bytes = _dbus_string_get_length (&addr);
833 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
835 /* pipe write returns an error on failure but not short write */
836 if (error != NULL && !dbus_error_is_set (error))
838 dbus_set_error (error, DBUS_ERROR_FAILED,
839 "Printing message bus address: did not write all bytes\n");
841 _dbus_string_free (&addr);
845 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
846 _dbus_pipe_close (print_addr_pipe, NULL);
848 _dbus_string_free (&addr);
851 context->connections = bus_connections_new (context);
852 if (context->connections == NULL)
858 context->matchmaker = bus_matchmaker_new ();
859 if (context->matchmaker == NULL)
865 /* check user before we fork */
866 if (context->user != NULL)
868 if (!_dbus_verify_daemon_user (context->user))
870 dbus_set_error (error, DBUS_ERROR_FAILED,
871 "Could not get UID and GID for username \"%s\"",
877 /* Now become a daemon if appropriate and write out pid file in any case */
881 if (context->pidfile)
882 _dbus_string_init_const (&u, context->pidfile);
884 if (((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 && context->fork) ||
885 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS))
887 _dbus_verbose ("Forking and becoming daemon\n");
889 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
892 context->keep_umask))
894 _DBUS_ASSERT_ERROR_IS_SET (error);
900 _dbus_verbose ("Fork not requested\n");
902 /* Need to write PID file and to PID pipe for ourselves,
903 * not for the child process. This is a no-op if the pidfile
904 * is NULL and print_pid_pipe is NULL.
906 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
911 _DBUS_ASSERT_ERROR_IS_SET (error);
917 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
918 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
919 _dbus_pipe_close (print_pid_pipe, NULL);
921 if (!bus_selinux_full_init ())
923 bus_context_log (context, DBUS_SYSTEM_LOG_FATAL, "SELinux enabled but AVC initialization failed; check system log\n");
926 if (!process_config_postinit (context, parser, error))
928 _DBUS_ASSERT_ERROR_IS_SET (error);
934 bus_config_parser_unref (parser);
938 /* Here we change our credentials if required,
939 * as soon as we've set up our sockets and pidfile
941 if (context->user != NULL)
943 if (!_dbus_change_to_daemon_user (context->user, error))
945 _DBUS_ASSERT_ERROR_IS_SET (error);
950 /* FIXME - why not just put this in full_init() below? */
951 bus_selinux_audit_init ();
955 dbus_server_free_data_slot (&server_data_slot);
961 bus_config_parser_unref (parser);
963 bus_context_unref (context);
965 if (server_data_slot >= 0)
966 dbus_server_free_data_slot (&server_data_slot);
972 bus_context_get_id (BusContext *context,
975 return _dbus_uuid_encode (&context->uuid, uuid);
979 bus_context_reload_config (BusContext *context,
982 BusConfigParser *parser;
983 DBusString config_file;
986 /* Flush the user database cache */
987 _dbus_flush_caches ();
990 _dbus_string_init_const (&config_file, context->config_file);
991 parser = bus_config_load (&config_file, TRUE, NULL, error);
994 _DBUS_ASSERT_ERROR_IS_SET (error);
998 if (!process_config_every_time (context, parser, TRUE, error))
1000 _DBUS_ASSERT_ERROR_IS_SET (error);
1003 if (!process_config_postinit (context, parser, error))
1005 _DBUS_ASSERT_ERROR_IS_SET (error);
1010 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
1013 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
1015 bus_config_parser_unref (parser);
1020 shutdown_server (BusContext *context,
1023 if (server == NULL ||
1024 !dbus_server_get_is_connected (server))
1027 if (!dbus_server_set_watch_functions (server,
1031 _dbus_assert_not_reached ("setting watch functions to NULL failed");
1033 if (!dbus_server_set_timeout_functions (server,
1037 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
1039 dbus_server_disconnect (server);
1043 bus_context_shutdown (BusContext *context)
1047 link = _dbus_list_get_first_link (&context->servers);
1048 while (link != NULL)
1050 shutdown_server (context, link->data);
1052 link = _dbus_list_get_next_link (&context->servers, link);
1057 bus_context_ref (BusContext *context)
1059 _dbus_assert (context->refcount > 0);
1060 context->refcount += 1;
1066 bus_context_unref (BusContext *context)
1068 _dbus_assert (context->refcount > 0);
1069 context->refcount -= 1;
1071 if (context->refcount == 0)
1075 _dbus_verbose ("Finalizing bus context %p\n", context);
1077 bus_context_shutdown (context);
1079 if (context->connections)
1081 bus_connections_unref (context->connections);
1082 context->connections = NULL;
1085 if (context->registry)
1087 bus_registry_unref (context->registry);
1088 context->registry = NULL;
1091 if (context->activation)
1093 bus_activation_unref (context->activation);
1094 context->activation = NULL;
1097 link = _dbus_list_get_first_link (&context->servers);
1098 while (link != NULL)
1100 dbus_server_unref (link->data);
1102 link = _dbus_list_get_next_link (&context->servers, link);
1104 _dbus_list_clear (&context->servers);
1106 if (context->policy)
1108 bus_policy_unref (context->policy);
1109 context->policy = NULL;
1114 _dbus_loop_unref (context->loop);
1115 context->loop = NULL;
1118 if (context->matchmaker)
1120 bus_matchmaker_unref (context->matchmaker);
1121 context->matchmaker = NULL;
1124 dbus_free (context->config_file);
1125 dbus_free (context->log_prefix);
1126 dbus_free (context->type);
1127 dbus_free (context->address);
1128 dbus_free (context->user);
1129 dbus_free (context->servicehelper);
1131 if (context->pidfile)
1134 _dbus_string_init_const (&u, context->pidfile);
1136 /* Deliberately ignore errors here, since there's not much
1137 * we can do about it, and we're exiting anyways.
1139 _dbus_delete_file (&u, NULL);
1141 dbus_free (context->pidfile);
1143 dbus_free (context);
1145 dbus_server_free_data_slot (&server_data_slot);
1149 /* type may be NULL */
1151 bus_context_get_type (BusContext *context)
1153 return context->type;
1157 bus_context_get_address (BusContext *context)
1159 return context->address;
1163 bus_context_get_servicehelper (BusContext *context)
1165 return context->servicehelper;
1169 bus_context_get_systemd_activation (BusContext *context)
1171 return context->systemd_activation;
1175 bus_context_get_registry (BusContext *context)
1177 return context->registry;
1181 bus_context_get_connections (BusContext *context)
1183 return context->connections;
1187 bus_context_get_activation (BusContext *context)
1189 return context->activation;
1193 bus_context_get_matchmaker (BusContext *context)
1195 return context->matchmaker;
1199 bus_context_get_loop (BusContext *context)
1201 return context->loop;
1204 DBusConnection* bus_context_get_myConnection(BusContext *context)
1206 return context->myConnection;
1210 bus_context_allow_unix_user (BusContext *context,
1213 return bus_policy_allow_unix_user (context->policy,
1217 /* For now this is never actually called because the default
1218 * DBusConnection behavior of 'same user that owns the bus can connect'
1219 * is all it would do.
1222 bus_context_allow_windows_user (BusContext *context,
1223 const char *windows_sid)
1225 return bus_policy_allow_windows_user (context->policy,
1230 bus_context_get_policy (BusContext *context)
1232 return context->policy;
1236 bus_context_create_client_policy (BusContext *context,
1237 DBusConnection *connection,
1240 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1241 return bus_policy_create_client_policy (context->policy, connection,
1246 bus_context_get_activation_timeout (BusContext *context)
1249 return context->limits.activation_timeout;
1253 bus_context_get_auth_timeout (BusContext *context)
1255 return context->limits.auth_timeout;
1259 bus_context_get_max_completed_connections (BusContext *context)
1261 return context->limits.max_completed_connections;
1265 bus_context_get_max_incomplete_connections (BusContext *context)
1267 return context->limits.max_incomplete_connections;
1271 bus_context_get_max_connections_per_user (BusContext *context)
1273 return context->limits.max_connections_per_user;
1277 bus_context_get_max_pending_activations (BusContext *context)
1279 return context->limits.max_pending_activations;
1283 bus_context_get_max_services_per_connection (BusContext *context)
1285 return context->limits.max_services_per_connection;
1289 bus_context_get_max_match_rules_per_connection (BusContext *context)
1291 return context->limits.max_match_rules_per_connection;
1295 bus_context_get_max_replies_per_connection (BusContext *context)
1297 return context->limits.max_replies_per_connection;
1301 bus_context_get_reply_timeout (BusContext *context)
1303 return context->limits.reply_timeout;
1307 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...) _DBUS_GNUC_PRINTF (3, 4);
1310 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1314 if (!context->syslog)
1316 /* we're not syslogging; just output to stderr */
1317 va_start (args, msg);
1318 vfprintf (stderr, msg, args);
1319 fprintf (stderr, "\n");
1324 va_start (args, msg);
1326 if (context->log_prefix)
1328 DBusString full_msg;
1330 if (!_dbus_string_init (&full_msg))
1332 if (!_dbus_string_append (&full_msg, context->log_prefix))
1334 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1337 _dbus_system_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1339 _dbus_string_free (&full_msg);
1342 _dbus_system_logv (severity, msg, args);
1348 static inline const char *
1349 nonnull (const char *maybe_null,
1350 const char *if_null)
1352 return (maybe_null ? maybe_null : if_null);
1356 * Log something about a message, usually that it was rejected.
1359 complain_about_message (BusContext *context,
1360 const char *error_name,
1361 const char *complaint,
1363 DBusMessage *message,
1364 DBusConnection *sender,
1365 DBusConnection *proposed_recipient,
1366 dbus_bool_t requested_reply,
1370 DBusError stack_error = DBUS_ERROR_INIT;
1371 const char *sender_name;
1372 const char *sender_loginfo;
1373 const char *proposed_recipient_loginfo;
1375 if (error == NULL && !log)
1380 sender_name = bus_connection_get_name (sender);
1381 sender_loginfo = bus_connection_get_loginfo (sender);
1385 sender_name = "(unset)";
1386 sender_loginfo = "(bus)";
1389 if (proposed_recipient != NULL)
1390 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1392 proposed_recipient_loginfo = "bus";
1394 dbus_set_error (&stack_error, error_name,
1395 "%s, %d matched rules; type=\"%s\", sender=\"%s\" (%s) "
1396 "interface=\"%s\" member=\"%s\" error name=\"%s\" "
1397 "requested_reply=\"%d\" destination=\"%s\" (%s)",
1400 dbus_message_type_to_string (dbus_message_get_type (message)),
1403 nonnull (dbus_message_get_interface (message), "(unset)"),
1404 nonnull (dbus_message_get_member (message), "(unset)"),
1405 nonnull (dbus_message_get_error_name (message), "(unset)"),
1407 nonnull (dbus_message_get_destination (message), DBUS_SERVICE_DBUS),
1408 proposed_recipient_loginfo);
1410 /* If we hit OOM while setting the error, this will syslog "out of memory"
1411 * which is itself an indication that something is seriously wrong */
1413 bus_context_log (context, DBUS_SYSTEM_LOG_SECURITY, "%s",
1414 stack_error.message);
1416 dbus_move_error (&stack_error, error);
1420 * addressed_recipient is the recipient specified in the message.
1422 * proposed_recipient is the recipient we're considering sending
1423 * to right this second, and may be an eavesdropper.
1425 * sender is the sender of the message.
1427 * NULL for proposed_recipient or sender definitely means the bus driver.
1429 * NULL for addressed_recipient may mean the bus driver, or may mean
1430 * no destination was specified in the message (e.g. a signal).
1433 bus_context_check_security_policy (BusContext *context,
1434 BusTransaction *transaction,
1435 DBusConnection *sender,
1436 DBusConnection *addressed_recipient,
1437 DBusConnection *proposed_recipient,
1438 DBusMessage *message,
1442 BusClientPolicy *sender_policy;
1443 BusClientPolicy *recipient_policy;
1444 dbus_int32_t toggles;
1447 dbus_bool_t requested_reply;
1449 type = dbus_message_get_type (message);
1450 dest = dbus_message_get_destination (message);
1452 /* dispatch.c was supposed to ensure these invariants */
1453 _dbus_assert (dest != NULL ||
1454 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1455 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1456 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1457 addressed_recipient != NULL ||
1458 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1462 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1463 case DBUS_MESSAGE_TYPE_SIGNAL:
1464 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1465 case DBUS_MESSAGE_TYPE_ERROR:
1469 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1472 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1473 "Message bus will not accept messages of unknown type\n");
1478 requested_reply = FALSE;
1482 /* First verify the SELinux access controls. If allowed then
1483 * go on with the standard checks.
1485 if (!bus_selinux_allows_send (sender, proposed_recipient,
1486 dbus_message_type_to_string (dbus_message_get_type (message)),
1487 dbus_message_get_interface (message),
1488 dbus_message_get_member (message),
1489 dbus_message_get_error_name (message),
1490 dest ? dest : DBUS_SERVICE_DBUS, error))
1492 if (error != NULL && !dbus_error_is_set (error))
1494 /* don't syslog this, just set the error: avc_has_perm should
1495 * have already written to either the audit log or syslog */
1496 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1497 "An SELinux policy prevents this sender from sending this "
1498 "message to this recipient",
1499 0, message, sender, proposed_recipient, FALSE, FALSE, error);
1500 _dbus_verbose ("SELinux security check denying send to service\n");
1506 if (bus_connection_is_active (sender))
1508 sender_policy = bus_connection_get_policy (sender);
1509 _dbus_assert (sender_policy != NULL);
1511 /* Fill in requested_reply variable with TRUE if this is a
1512 * reply and the reply was pending.
1514 if (dbus_message_get_reply_serial (message) != 0)
1516 if (proposed_recipient != NULL /* not to the bus driver */ &&
1517 addressed_recipient == proposed_recipient /* not eavesdropping */)
1521 dbus_error_init (&error2);
1522 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1524 sender, addressed_recipient, message,
1526 if (dbus_error_is_set (&error2))
1528 dbus_move_error (&error2, error);
1536 /* Policy for inactive connections is that they can only send
1537 * the hello message to the bus driver
1539 if (proposed_recipient == NULL &&
1540 dbus_message_is_method_call (message,
1541 DBUS_INTERFACE_DBUS,
1544 _dbus_verbose ("security check allowing %s message\n",
1550 _dbus_verbose ("security check disallowing non-%s message\n",
1553 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1554 "Client tried to send a message other than %s without being registered",
1563 sender_policy = NULL;
1565 /* If the sender is the bus driver, we assume any reply was a
1566 * requested reply as bus driver won't send bogus ones
1568 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1569 dbus_message_get_reply_serial (message) != 0)
1570 requested_reply = TRUE;
1573 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1574 (sender == NULL && sender_policy == NULL));
1576 if (proposed_recipient != NULL)
1578 /* only the bus driver can send to an inactive recipient (as it
1579 * owns no services, so other apps can't address it). Inactive
1580 * recipients can receive any message.
1582 if (bus_connection_is_active (proposed_recipient))
1584 recipient_policy = bus_connection_get_policy (proposed_recipient);
1585 _dbus_assert (recipient_policy != NULL);
1587 else if (sender == NULL)
1589 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1590 recipient_policy = NULL;
1594 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus\n");
1595 recipient_policy = NULL;
1599 recipient_policy = NULL;
1601 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1602 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1603 (proposed_recipient == NULL && recipient_policy == NULL));
1606 if (sender_policy &&
1607 !bus_client_policy_check_can_send (sender_policy,
1611 message, &toggles, &log))
1613 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1614 "Rejected send message", toggles,
1615 message, sender, proposed_recipient, requested_reply,
1616 (addressed_recipient == proposed_recipient), error);
1617 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1623 /* We want to drop this message, and are only not doing so for backwards
1625 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1626 "Would reject message", toggles,
1627 message, sender, proposed_recipient, requested_reply,
1631 if (recipient_policy &&
1632 !bus_client_policy_check_can_receive (recipient_policy,
1636 addressed_recipient, proposed_recipient,
1639 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1640 "Rejected receive message", toggles,
1641 message, sender, proposed_recipient, requested_reply,
1642 (addressed_recipient == proposed_recipient), NULL);
1643 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1647 /* See if limits on size have been exceeded */
1648 if (proposed_recipient &&
1649 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1650 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1652 complain_about_message (context, DBUS_ERROR_LIMITS_EXCEEDED,
1653 "Rejected: destination has a full message queue",
1654 0, message, sender, proposed_recipient, requested_reply, TRUE,
1656 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1660 /* Record that we will allow a reply here in the future (don't
1661 * bother if the recipient is the bus or this is an eavesdropping
1662 * connection). Only the addressed recipient may reply.
1664 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1666 addressed_recipient &&
1667 addressed_recipient == proposed_recipient && /* not eavesdropping */
1668 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1670 sender, addressed_recipient,
1673 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1677 _dbus_verbose ("security policy allowing message\n");