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"
39 #include "dir-watch.h"
40 #include <dbus/dbus-list.h>
41 #include <dbus/dbus-hash.h>
42 #include <dbus/dbus-credentials.h>
43 #include <dbus/dbus-internals.h>
44 #include <dbus/dbus-server-protected.h>
63 BusConnections *connections;
64 BusActivation *activation;
65 BusRegistry *registry;
67 BusMatchmaker *matchmaker;
69 DBusRLimit *initial_fd_limit;
70 unsigned int fork : 1;
71 unsigned int syslog : 1;
72 unsigned int keep_umask : 1;
73 unsigned int allow_anonymous : 1;
74 unsigned int systemd_activation : 1;
75 dbus_bool_t watches_enabled;
78 static dbus_int32_t server_data_slot = -1;
85 #define BUS_SERVER_DATA(server) (dbus_server_get_data ((server), server_data_slot))
88 server_get_context (DBusServer *server)
93 /* this data slot was allocated by the BusContext */
94 _dbus_assert (server_data_slot >= 0);
96 bd = BUS_SERVER_DATA (server);
98 /* every DBusServer in the dbus-daemon has gone through setup_server() */
99 _dbus_assert (bd != NULL);
101 context = bd->context;
107 add_server_watch (DBusWatch *watch,
110 DBusServer *server = data;
113 context = server_get_context (server);
115 return _dbus_loop_add_watch (context->loop, watch);
119 remove_server_watch (DBusWatch *watch,
122 DBusServer *server = data;
125 context = server_get_context (server);
127 _dbus_loop_remove_watch (context->loop, watch);
131 toggle_server_watch (DBusWatch *watch,
134 DBusServer *server = data;
137 context = server_get_context (server);
139 _dbus_loop_toggle_watch (context->loop, watch);
143 add_server_timeout (DBusTimeout *timeout,
146 DBusServer *server = data;
149 context = server_get_context (server);
151 return _dbus_loop_add_timeout (context->loop, timeout);
155 remove_server_timeout (DBusTimeout *timeout,
158 DBusServer *server = data;
161 context = server_get_context (server);
163 _dbus_loop_remove_timeout (context->loop, timeout);
167 new_connection_callback (DBusServer *server,
168 DBusConnection *new_connection,
171 BusContext *context = data;
173 if (!bus_connections_setup_connection (context->connections, new_connection))
175 _dbus_verbose ("No memory to setup new connection\n");
177 /* if we don't do this, it will get unref'd without
178 * being disconnected... kind of strange really
179 * that we have to do this, people won't get it right
182 dbus_connection_close (new_connection);
185 dbus_connection_set_max_received_size (new_connection,
186 context->limits.max_incoming_bytes);
188 dbus_connection_set_max_message_size (new_connection,
189 context->limits.max_message_size);
191 dbus_connection_set_max_received_unix_fds (new_connection,
192 context->limits.max_incoming_unix_fds);
194 dbus_connection_set_max_message_unix_fds (new_connection,
195 context->limits.max_message_unix_fds);
197 dbus_connection_set_allow_anonymous (new_connection,
198 context->allow_anonymous);
200 /* on OOM, we won't have ref'd the connection so it will die. */
204 free_server_data (void *data)
206 BusServerData *bd = data;
212 setup_server (BusContext *context,
214 char **auth_mechanisms,
219 bd = dbus_new0 (BusServerData, 1);
220 if (bd == NULL || !dbus_server_set_data (server,
222 bd, free_server_data))
229 bd->context = context;
231 if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms))
237 dbus_server_set_new_connection_function (server,
238 new_connection_callback,
241 if (!dbus_server_set_watch_functions (server,
252 if (!dbus_server_set_timeout_functions (server,
254 remove_server_timeout,
265 /* This code only gets executed the first time the
266 * config files are parsed. It is not executed
267 * when config files are reloaded.
270 process_config_first_time_only (BusContext *context,
271 BusConfigParser *parser,
272 const DBusString *address,
273 BusContextFlags flags,
276 DBusString log_prefix;
278 DBusList **addresses;
279 const char *user, *pidfile;
280 char **auth_mechanisms;
281 DBusList **auth_mechanisms_list;
284 DBusLogFlags log_flags = DBUS_LOG_FLAGS_STDERR;
286 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
289 auth_mechanisms = NULL;
292 if (flags & BUS_CONTEXT_FLAG_SYSLOG_ALWAYS)
294 context->syslog = TRUE;
295 log_flags |= DBUS_LOG_FLAGS_SYSTEM_LOG;
297 if (flags & BUS_CONTEXT_FLAG_SYSLOG_ONLY)
298 log_flags &= ~DBUS_LOG_FLAGS_STDERR;
300 else if (flags & BUS_CONTEXT_FLAG_SYSLOG_NEVER)
302 context->syslog = FALSE;
306 context->syslog = bus_config_parser_get_syslog (parser);
309 log_flags |= DBUS_LOG_FLAGS_SYSTEM_LOG;
312 _dbus_init_system_log ("dbus-daemon", log_flags);
314 if (flags & BUS_CONTEXT_FLAG_SYSTEMD_ACTIVATION)
315 context->systemd_activation = TRUE;
317 context->systemd_activation = FALSE;
319 /* Check for an existing pid file. Of course this is a race;
320 * we'd have to use fcntl() locks on the pid file to
321 * avoid that. But we want to check for the pid file
322 * before overwriting any existing sockets, etc.
325 if (flags & BUS_CONTEXT_FLAG_WRITE_PID_FILE)
326 pidfile = bus_config_parser_get_pidfile (parser);
333 _dbus_string_init_const (&u, pidfile);
335 if (_dbus_stat (&u, &stbuf, NULL))
341 _dbus_string_init (&p);
342 _dbus_file_get_contents(&p, &u, NULL);
343 _dbus_string_parse_int(&p, 0, &pid, NULL);
344 _dbus_string_free(&p);
346 if ((kill((int)pid, 0))) {
347 dbus_set_error(NULL, DBUS_ERROR_FILE_EXISTS,
348 "pid %ld not running, removing stale pid file\n",
350 _dbus_delete_file(&u, NULL);
353 dbus_set_error (error, DBUS_ERROR_FAILED,
354 "The pid file \"%s\" exists, if the message bus is not running, remove this file",
363 /* keep around the pid filename so we can delete it later */
364 context->pidfile = _dbus_strdup (pidfile);
366 /* note that type may be NULL */
367 context->type = _dbus_strdup (bus_config_parser_get_type (parser));
368 if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
371 user = bus_config_parser_get_user (parser);
374 context->user = _dbus_strdup (user);
375 if (context->user == NULL)
379 /* Set up the prefix for syslog messages */
380 if (!_dbus_string_init (&log_prefix))
382 if (context->type && !strcmp (context->type, "system"))
384 if (!_dbus_string_append (&log_prefix, "[system] "))
387 else if (context->type && !strcmp (context->type, "session"))
389 DBusCredentials *credentials;
391 credentials = _dbus_credentials_new_from_current_process ();
394 if (!_dbus_string_append (&log_prefix, "[session "))
396 _dbus_credentials_unref (credentials);
399 if (!_dbus_credentials_to_string_append (credentials, &log_prefix))
401 _dbus_credentials_unref (credentials);
404 if (!_dbus_string_append (&log_prefix, "] "))
406 _dbus_credentials_unref (credentials);
409 _dbus_credentials_unref (credentials);
411 if (!_dbus_string_steal_data (&log_prefix, &context->log_prefix))
413 _dbus_string_free (&log_prefix);
415 /* Build an array of auth mechanisms */
417 auth_mechanisms_list = bus_config_parser_get_mechanisms (parser);
418 len = _dbus_list_get_length (auth_mechanisms_list);
424 auth_mechanisms = dbus_new0 (char*, len + 1);
425 if (auth_mechanisms == NULL)
429 link = _dbus_list_get_first_link (auth_mechanisms_list);
432 auth_mechanisms[i] = _dbus_strdup (link->data);
433 if (auth_mechanisms[i] == NULL)
435 link = _dbus_list_get_next_link (auth_mechanisms_list, link);
441 auth_mechanisms = NULL;
444 /* Listen on our addresses */
450 server = dbus_server_listen (_dbus_string_get_const_data(address), error);
453 _DBUS_ASSERT_ERROR_IS_SET (error);
456 else if (!setup_server (context, server, auth_mechanisms, error))
458 _DBUS_ASSERT_ERROR_IS_SET (error);
462 if (!_dbus_list_append (&context->servers, server))
467 addresses = bus_config_parser_get_addresses (parser);
469 link = _dbus_list_get_first_link (addresses);
474 server = dbus_server_listen (link->data, error);
477 _DBUS_ASSERT_ERROR_IS_SET (error);
480 else if (!setup_server (context, server, auth_mechanisms, error))
482 _DBUS_ASSERT_ERROR_IS_SET (error);
486 if (!_dbus_list_append (&context->servers, server))
489 link = _dbus_list_get_next_link (addresses, link);
493 context->fork = bus_config_parser_get_fork (parser);
494 context->keep_umask = bus_config_parser_get_keep_umask (parser);
495 context->allow_anonymous = bus_config_parser_get_allow_anonymous (parser);
497 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
501 dbus_free_string_array (auth_mechanisms);
506 dbus_free_string_array (auth_mechanisms);
510 /* This code gets executed every time the config files
511 * are parsed: both during BusContext construction
512 * and on reloads. This function is slightly screwy
513 * since it can do a "half reload" in out-of-memory
514 * situations. Realistically, unlikely to ever matter.
517 process_config_every_time (BusContext *context,
518 BusConfigParser *parser,
519 dbus_bool_t is_reload,
522 DBusString full_address;
526 const char *servicehelper;
531 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
536 if (!_dbus_string_init (&full_address))
542 /* get our limits and timeout lengths */
543 bus_config_parser_get_limits (parser, &context->limits);
546 bus_policy_unref (context->policy);
547 context->policy = bus_config_parser_steal_policy (parser);
548 _dbus_assert (context->policy != NULL);
550 /* context->connections is NULL when creating new BusContext */
551 if (context->connections)
553 _dbus_verbose ("Reload policy rules for completed connections\n");
554 retval = bus_connections_reload_policy (context->connections, error);
557 _DBUS_ASSERT_ERROR_IS_SET (error);
562 /* We have to build the address backward, so that
563 * <listen> later in the config file have priority
565 link = _dbus_list_get_last_link (&context->servers);
568 addr = dbus_server_get_address (link->data);
575 if (_dbus_string_get_length (&full_address) > 0)
577 if (!_dbus_string_append (&full_address, ";"))
584 if (!_dbus_string_append (&full_address, addr))
593 link = _dbus_list_get_prev_link (&context->servers, link);
597 dbus_free (context->address);
599 if (!_dbus_string_copy_data (&full_address, &context->address))
605 /* get the service directories */
606 dirs = bus_config_parser_get_service_dirs (parser);
608 /* and the service helper */
609 servicehelper = bus_config_parser_get_servicehelper (parser);
611 s = _dbus_strdup(servicehelper);
612 if (s == NULL && servicehelper != NULL)
619 dbus_free(context->servicehelper);
620 context->servicehelper = s;
623 /* Create activation subsystem */
624 if (context->activation)
626 if (!bus_activation_reload (context->activation, &full_address, dirs, error))
631 context->activation = bus_activation_new (context, &full_address, dirs, error);
634 if (context->activation == NULL)
636 _DBUS_ASSERT_ERROR_IS_SET (error);
640 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
644 _dbus_string_free (&full_address);
653 list_concat_new (DBusList **a,
661 for (link = _dbus_list_get_first_link (a); link; link = _dbus_list_get_next_link (a, link))
663 if (!_dbus_list_append (result, link->data))
666 for (link = _dbus_list_get_first_link (b); link; link = _dbus_list_get_next_link (b, link))
668 if (!_dbus_list_append (result, link->data))
674 _dbus_list_clear (result);
679 raise_file_descriptor_limit (BusContext *context)
682 DBusError error = DBUS_ERROR_INIT;
684 /* we only do this once */
685 if (context->initial_fd_limit != NULL)
688 context->initial_fd_limit = _dbus_rlimit_save_fd_limit (&error);
690 if (context->initial_fd_limit == NULL)
692 bus_context_log (context, DBUS_SYSTEM_LOG_WARNING,
693 "%s: %s", error.name, error.message);
694 dbus_error_free (&error);
698 /* We used to compute a suitable rlimit based on the configured number
699 * of connections, but that breaks down as soon as we allow fd-passing,
700 * because each connection is allowed to pass 64 fds to us, and if
701 * they all did, we'd hit kernel limits. We now hard-code 64k as a
702 * good limit, like systemd does: that's enough to avoid DoS from
703 * anything short of multiple uids conspiring against us.
705 if (!_dbus_rlimit_raise_fd_limit_if_privileged (65536, &error))
707 bus_context_log (context, DBUS_SYSTEM_LOG_WARNING,
708 "%s: %s", error.name, error.message);
709 dbus_error_free (&error);
716 process_config_postinit (BusContext *context,
717 BusConfigParser *parser,
720 DBusHashTable *service_context_table;
721 DBusList *watched_dirs = NULL;
723 raise_file_descriptor_limit (context);
725 service_context_table = bus_config_parser_steal_service_context_table (parser);
726 if (!bus_registry_set_service_context_table (context->registry,
727 service_context_table))
733 _dbus_hash_table_unref (service_context_table);
735 /* We need to monitor both the configuration directories and directories
736 * containing .service files.
738 if (!list_concat_new (bus_config_parser_get_conf_dirs (parser),
739 bus_config_parser_get_service_dirs (parser),
746 bus_set_watched_dirs (context, &watched_dirs);
748 _dbus_list_clear (&watched_dirs);
754 bus_context_new (const DBusString *config_file,
755 BusContextFlags flags,
756 DBusPipe *print_addr_pipe,
757 DBusPipe *print_pid_pipe,
758 const DBusString *address,
762 BusConfigParser *parser;
764 _dbus_assert ((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 ||
765 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS) == 0);
767 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
772 if (!dbus_server_allocate_data_slot (&server_data_slot))
778 context = dbus_new0 (BusContext, 1);
784 context->refcount = 1;
786 if (!_dbus_generate_uuid (&context->uuid, error))
789 if (!_dbus_string_copy_data (config_file, &context->config_file))
795 context->loop = _dbus_loop_new ();
796 if (context->loop == NULL)
802 context->watches_enabled = TRUE;
804 context->registry = bus_registry_new (context);
805 if (context->registry == NULL)
811 parser = bus_config_load (config_file, TRUE, NULL, error);
814 _DBUS_ASSERT_ERROR_IS_SET (error);
818 if (!process_config_first_time_only (context, parser, address, flags, error))
820 _DBUS_ASSERT_ERROR_IS_SET (error);
823 if (!process_config_every_time (context, parser, FALSE, error))
825 _DBUS_ASSERT_ERROR_IS_SET (error);
829 /* we need another ref of the server data slot for the context
832 if (!dbus_server_allocate_data_slot (&server_data_slot))
833 _dbus_assert_not_reached ("second ref of server data slot failed");
835 /* Note that we don't know whether the print_addr_pipe is
836 * one of the sockets we're using to listen on, or some
837 * other random thing. But I think the answer is "don't do
840 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
843 const char *a = bus_context_get_address (context);
846 _dbus_assert (a != NULL);
847 if (!_dbus_string_init (&addr))
853 if (!_dbus_string_append (&addr, a) ||
854 !_dbus_string_append (&addr, "\n"))
856 _dbus_string_free (&addr);
861 bytes = _dbus_string_get_length (&addr);
862 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
864 /* pipe write returns an error on failure but not short write */
865 if (error != NULL && !dbus_error_is_set (error))
867 dbus_set_error (error, DBUS_ERROR_FAILED,
868 "Printing message bus address: did not write all bytes\n");
870 _dbus_string_free (&addr);
874 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
875 _dbus_pipe_close (print_addr_pipe, NULL);
877 _dbus_string_free (&addr);
880 context->connections = bus_connections_new (context);
881 if (context->connections == NULL)
887 context->matchmaker = bus_matchmaker_new ();
888 if (context->matchmaker == NULL)
894 /* check user before we fork */
895 if (context->user != NULL)
897 if (!_dbus_verify_daemon_user (context->user))
899 dbus_set_error (error, DBUS_ERROR_FAILED,
900 "Could not get UID and GID for username \"%s\"",
906 /* Now become a daemon if appropriate and write out pid file in any case */
910 if (context->pidfile)
911 _dbus_string_init_const (&u, context->pidfile);
913 if (((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 && context->fork) ||
914 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS))
916 _dbus_verbose ("Forking and becoming daemon\n");
918 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
921 context->keep_umask))
923 _DBUS_ASSERT_ERROR_IS_SET (error);
929 _dbus_verbose ("Fork not requested\n");
931 /* Need to write PID file and to PID pipe for ourselves,
932 * not for the child process. This is a no-op if the pidfile
933 * is NULL and print_pid_pipe is NULL.
935 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
940 _DBUS_ASSERT_ERROR_IS_SET (error);
946 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
947 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
948 _dbus_pipe_close (print_pid_pipe, NULL);
950 /* Here we change our credentials if required,
951 * as soon as we've set up our sockets and pidfile.
952 * This must be done before initializing LSMs, so that the netlink
953 * monitoring thread started by avc_init() will not lose CAP_AUDIT_WRITE
954 * when the main thread calls setuid().
955 * https://bugs.freedesktop.org/show_bug.cgi?id=92832
957 if (context->user != NULL)
959 if (!_dbus_change_to_daemon_user (context->user, error))
961 _DBUS_ASSERT_ERROR_IS_SET (error);
966 /* Auditing should be initialized before LSMs, so that the LSMs are able
967 * to log audit-events that happen during their initialization.
969 bus_audit_init (context);
971 if (!bus_selinux_full_init ())
973 bus_context_log (context, DBUS_SYSTEM_LOG_FATAL, "SELinux enabled but D-Bus initialization failed; check system log\n");
976 if (!bus_apparmor_full_init (error))
978 _DBUS_ASSERT_ERROR_IS_SET (error);
982 if (bus_apparmor_enabled ())
984 /* Only print AppArmor mediation message when syslog support is enabled */
986 bus_context_log (context, DBUS_SYSTEM_LOG_INFO,
987 "AppArmor D-Bus mediation is enabled\n");
990 /* When SELinux is used, this must happen after bus_selinux_full_init()
991 * so that it has access to the access vector cache, which is required
992 * to process <associate/> elements.
993 * http://lists.freedesktop.org/archives/dbus/2008-October/010491.html
995 if (!process_config_postinit (context, parser, error))
997 _DBUS_ASSERT_ERROR_IS_SET (error);
1003 bus_config_parser_unref (parser);
1007 dbus_server_free_data_slot (&server_data_slot);
1013 bus_config_parser_unref (parser);
1014 if (context != NULL)
1015 bus_context_unref (context);
1017 if (server_data_slot >= 0)
1018 dbus_server_free_data_slot (&server_data_slot);
1024 bus_context_get_id (BusContext *context,
1027 return _dbus_uuid_encode (&context->uuid, uuid);
1031 bus_context_reload_config (BusContext *context,
1034 BusConfigParser *parser;
1035 DBusString config_file;
1038 /* Flush the user database cache */
1039 _dbus_flush_caches ();
1042 _dbus_string_init_const (&config_file, context->config_file);
1043 parser = bus_config_load (&config_file, TRUE, NULL, error);
1046 _DBUS_ASSERT_ERROR_IS_SET (error);
1050 if (!process_config_every_time (context, parser, TRUE, error))
1052 _DBUS_ASSERT_ERROR_IS_SET (error);
1055 if (!process_config_postinit (context, parser, error))
1057 _DBUS_ASSERT_ERROR_IS_SET (error);
1062 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
1065 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
1067 bus_config_parser_unref (parser);
1072 shutdown_server (BusContext *context,
1075 if (server == NULL ||
1076 !dbus_server_get_is_connected (server))
1079 if (!dbus_server_set_watch_functions (server,
1083 _dbus_assert_not_reached ("setting watch functions to NULL failed");
1085 if (!dbus_server_set_timeout_functions (server,
1089 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
1091 dbus_server_disconnect (server);
1095 bus_context_shutdown (BusContext *context)
1099 link = _dbus_list_get_first_link (&context->servers);
1100 while (link != NULL)
1102 shutdown_server (context, link->data);
1104 link = _dbus_list_get_next_link (&context->servers, link);
1109 bus_context_ref (BusContext *context)
1111 _dbus_assert (context->refcount > 0);
1112 context->refcount += 1;
1118 bus_context_unref (BusContext *context)
1120 _dbus_assert (context->refcount > 0);
1121 context->refcount -= 1;
1123 if (context->refcount == 0)
1127 _dbus_verbose ("Finalizing bus context %p\n", context);
1129 bus_context_shutdown (context);
1131 if (context->connections)
1133 bus_connections_unref (context->connections);
1134 context->connections = NULL;
1137 if (context->registry)
1139 bus_registry_unref (context->registry);
1140 context->registry = NULL;
1143 if (context->activation)
1145 bus_activation_unref (context->activation);
1146 context->activation = NULL;
1149 link = _dbus_list_get_first_link (&context->servers);
1150 while (link != NULL)
1152 dbus_server_unref (link->data);
1154 link = _dbus_list_get_next_link (&context->servers, link);
1156 _dbus_list_clear (&context->servers);
1158 if (context->policy)
1160 bus_policy_unref (context->policy);
1161 context->policy = NULL;
1166 _dbus_loop_unref (context->loop);
1167 context->loop = NULL;
1170 if (context->matchmaker)
1172 bus_matchmaker_unref (context->matchmaker);
1173 context->matchmaker = NULL;
1176 dbus_free (context->config_file);
1177 dbus_free (context->log_prefix);
1178 dbus_free (context->type);
1179 dbus_free (context->address);
1180 dbus_free (context->user);
1181 dbus_free (context->servicehelper);
1183 if (context->pidfile)
1186 _dbus_string_init_const (&u, context->pidfile);
1188 /* Deliberately ignore errors here, since there's not much
1189 * we can do about it, and we're exiting anyways.
1191 _dbus_delete_file (&u, NULL);
1193 dbus_free (context->pidfile);
1196 if (context->initial_fd_limit)
1197 _dbus_rlimit_free (context->initial_fd_limit);
1199 dbus_free (context);
1201 dbus_server_free_data_slot (&server_data_slot);
1205 /* type may be NULL */
1207 bus_context_get_type (BusContext *context)
1209 return context->type;
1213 bus_context_get_address (BusContext *context)
1215 return context->address;
1219 bus_context_get_servicehelper (BusContext *context)
1221 return context->servicehelper;
1225 bus_context_get_systemd_activation (BusContext *context)
1227 return context->systemd_activation;
1231 bus_context_get_registry (BusContext *context)
1233 return context->registry;
1237 bus_context_get_connections (BusContext *context)
1239 return context->connections;
1243 bus_context_get_activation (BusContext *context)
1245 return context->activation;
1249 bus_context_get_matchmaker (BusContext *context)
1251 return context->matchmaker;
1255 bus_context_get_loop (BusContext *context)
1257 return context->loop;
1261 bus_context_allow_unix_user (BusContext *context,
1264 return bus_policy_allow_unix_user (context->policy,
1268 /* For now this is never actually called because the default
1269 * DBusConnection behavior of 'same user that owns the bus can connect'
1270 * is all it would do.
1273 bus_context_allow_windows_user (BusContext *context,
1274 const char *windows_sid)
1276 return bus_policy_allow_windows_user (context->policy,
1281 bus_context_get_policy (BusContext *context)
1283 return context->policy;
1287 bus_context_create_client_policy (BusContext *context,
1288 DBusConnection *connection,
1291 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1292 return bus_policy_create_client_policy (context->policy, connection,
1297 bus_context_get_activation_timeout (BusContext *context)
1300 return context->limits.activation_timeout;
1304 bus_context_get_auth_timeout (BusContext *context)
1306 return context->limits.auth_timeout;
1310 bus_context_get_pending_fd_timeout (BusContext *context)
1312 return context->limits.pending_fd_timeout;
1316 bus_context_get_max_completed_connections (BusContext *context)
1318 return context->limits.max_completed_connections;
1322 bus_context_get_max_incomplete_connections (BusContext *context)
1324 return context->limits.max_incomplete_connections;
1328 bus_context_get_max_connections_per_user (BusContext *context)
1330 return context->limits.max_connections_per_user;
1334 bus_context_get_max_pending_activations (BusContext *context)
1336 return context->limits.max_pending_activations;
1340 bus_context_get_max_services_per_connection (BusContext *context)
1342 return context->limits.max_services_per_connection;
1346 bus_context_get_max_match_rules_per_connection (BusContext *context)
1348 return context->limits.max_match_rules_per_connection;
1352 bus_context_get_max_replies_per_connection (BusContext *context)
1354 return context->limits.max_replies_per_connection;
1358 bus_context_get_reply_timeout (BusContext *context)
1360 return context->limits.reply_timeout;
1364 bus_context_get_initial_fd_limit (BusContext *context)
1366 return context->initial_fd_limit;
1370 bus_context_get_using_syslog (BusContext *context)
1372 return context->syslog;
1376 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1380 va_start (args, msg);
1382 if (context->log_prefix)
1384 DBusString full_msg;
1386 if (!_dbus_string_init (&full_msg))
1388 if (!_dbus_string_append (&full_msg, context->log_prefix))
1390 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1393 _dbus_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1395 _dbus_string_free (&full_msg);
1398 _dbus_logv (severity, msg, args);
1404 static inline const char *
1405 nonnull (const char *maybe_null,
1406 const char *if_null)
1408 return (maybe_null ? maybe_null : if_null);
1412 bus_context_log_literal (BusContext *context,
1413 DBusSystemLogSeverity severity,
1416 _dbus_log (severity, "%s%s", nonnull (context->log_prefix, ""), msg);
1420 bus_context_log_and_set_error (BusContext *context,
1421 DBusSystemLogSeverity severity,
1427 DBusError stack_error = DBUS_ERROR_INIT;
1430 va_start (args, msg);
1431 _dbus_set_error_valist (&stack_error, name, msg, args);
1434 /* If we hit OOM while setting the error, this will syslog "out of memory"
1435 * which is itself an indication that something is seriously wrong */
1436 bus_context_log_literal (context, DBUS_SYSTEM_LOG_SECURITY,
1437 stack_error.message);
1439 dbus_move_error (&stack_error, error);
1443 * Log something about a message, usually that it was rejected.
1446 complain_about_message (BusContext *context,
1447 const char *error_name,
1448 const char *complaint,
1450 DBusMessage *message,
1451 DBusConnection *sender,
1452 DBusConnection *proposed_recipient,
1453 dbus_bool_t requested_reply,
1457 DBusError stack_error = DBUS_ERROR_INIT;
1458 const char *sender_name;
1459 const char *sender_loginfo;
1460 const char *proposed_recipient_loginfo;
1462 if (error == NULL && !log)
1467 sender_name = bus_connection_get_name (sender);
1468 sender_loginfo = bus_connection_get_loginfo (sender);
1472 sender_name = "(unset)";
1473 sender_loginfo = "(bus)";
1476 if (proposed_recipient != NULL)
1477 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1479 proposed_recipient_loginfo = "bus";
1481 dbus_set_error (&stack_error, error_name,
1482 "%s, %d matched rules; type=\"%s\", sender=\"%s\" (%s) "
1483 "interface=\"%s\" member=\"%s\" error name=\"%s\" "
1484 "requested_reply=\"%d\" destination=\"%s\" (%s)",
1487 dbus_message_type_to_string (dbus_message_get_type (message)),
1490 nonnull (dbus_message_get_interface (message), "(unset)"),
1491 nonnull (dbus_message_get_member (message), "(unset)"),
1492 nonnull (dbus_message_get_error_name (message), "(unset)"),
1494 nonnull (dbus_message_get_destination (message), DBUS_SERVICE_DBUS),
1495 proposed_recipient_loginfo);
1497 /* If we hit OOM while setting the error, this will syslog "out of memory"
1498 * which is itself an indication that something is seriously wrong */
1500 bus_context_log_literal (context, DBUS_SYSTEM_LOG_SECURITY,
1501 stack_error.message);
1503 dbus_move_error (&stack_error, error);
1507 * addressed_recipient is the recipient specified in the message.
1509 * proposed_recipient is the recipient we're considering sending
1510 * to right this second, and may be an eavesdropper.
1512 * sender is the sender of the message.
1514 * NULL for sender definitely means the bus driver.
1516 * NULL for proposed_recipient may mean the bus driver, or may mean
1517 * we are checking whether service-activation is allowed as a first
1518 * pass before all details of the activated service are known.
1520 * NULL for addressed_recipient may mean the bus driver, or may mean
1521 * no destination was specified in the message (e.g. a signal).
1524 bus_context_check_security_policy (BusContext *context,
1525 BusTransaction *transaction,
1526 DBusConnection *sender,
1527 DBusConnection *addressed_recipient,
1528 DBusConnection *proposed_recipient,
1529 DBusMessage *message,
1530 BusActivationEntry *activation_entry,
1533 const char *src, *dest;
1534 BusClientPolicy *sender_policy;
1535 BusClientPolicy *recipient_policy;
1536 dbus_int32_t toggles;
1539 dbus_bool_t requested_reply;
1541 type = dbus_message_get_type (message);
1542 src = dbus_message_get_sender (message);
1543 dest = dbus_message_get_destination (message);
1545 /* dispatch.c was supposed to ensure these invariants */
1546 _dbus_assert (dest != NULL ||
1547 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1548 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1549 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1550 addressed_recipient != NULL ||
1551 activation_entry != NULL ||
1552 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1556 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1557 case DBUS_MESSAGE_TYPE_SIGNAL:
1558 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1559 case DBUS_MESSAGE_TYPE_ERROR:
1563 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1566 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1567 "Message bus will not accept messages of unknown type\n");
1572 requested_reply = FALSE;
1576 if (bus_connection_is_active (sender))
1578 sender_policy = bus_connection_get_policy (sender);
1579 _dbus_assert (sender_policy != NULL);
1581 /* Fill in requested_reply variable with TRUE if this is a
1582 * reply and the reply was pending.
1584 if (dbus_message_get_reply_serial (message) != 0)
1586 if (proposed_recipient != NULL /* not to the bus driver */ &&
1587 addressed_recipient == proposed_recipient /* not eavesdropping */)
1591 dbus_error_init (&error2);
1592 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1594 sender, addressed_recipient, message,
1596 if (dbus_error_is_set (&error2))
1598 dbus_move_error (&error2, error);
1606 sender_policy = NULL;
1609 /* First verify the SELinux access controls. If allowed then
1610 * go on with the standard checks.
1612 if (!bus_selinux_allows_send (sender, proposed_recipient,
1613 dbus_message_type_to_string (dbus_message_get_type (message)),
1614 dbus_message_get_interface (message),
1615 dbus_message_get_member (message),
1616 dbus_message_get_error_name (message),
1617 dest ? dest : DBUS_SERVICE_DBUS,
1621 if (error != NULL && !dbus_error_is_set (error))
1623 /* don't syslog this, just set the error: avc_has_perm should
1624 * have already written to either the audit log or syslog */
1625 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1626 "An SELinux policy prevents this sender from sending this "
1627 "message to this recipient",
1628 0, message, sender, proposed_recipient, FALSE, FALSE, error);
1629 _dbus_verbose ("SELinux security check denying send to service\n");
1635 /* next verify AppArmor access controls. If allowed then
1636 * go on with the standard checks.
1638 if (!bus_apparmor_allows_send (sender, proposed_recipient,
1640 bus_context_get_type (context),
1641 dbus_message_get_type (message),
1642 dbus_message_get_path (message),
1643 dbus_message_get_interface (message),
1644 dbus_message_get_member (message),
1645 dbus_message_get_error_name (message),
1646 dest ? dest : DBUS_SERVICE_DBUS,
1647 src ? src : DBUS_SERVICE_DBUS,
1652 if (!bus_connection_is_active (sender))
1654 /* Policy for inactive connections is that they can only send
1655 * the hello message to the bus driver
1657 if (proposed_recipient == NULL &&
1658 dbus_message_is_method_call (message,
1659 DBUS_INTERFACE_DBUS,
1662 _dbus_verbose ("security check allowing %s message\n",
1668 _dbus_verbose ("security check disallowing non-%s message\n",
1671 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1672 "Client tried to send a message other than %s without being registered",
1681 sender_policy = NULL;
1683 /* If the sender is the bus driver, we assume any reply was a
1684 * requested reply as bus driver won't send bogus ones
1686 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1687 dbus_message_get_reply_serial (message) != 0)
1688 requested_reply = TRUE;
1691 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1692 (sender == NULL && sender_policy == NULL));
1694 if (proposed_recipient != NULL)
1696 /* only the bus driver can send to an inactive recipient (as it
1697 * owns no services, so other apps can't address it). Inactive
1698 * recipients can receive any message.
1700 if (bus_connection_is_active (proposed_recipient))
1702 recipient_policy = bus_connection_get_policy (proposed_recipient);
1703 _dbus_assert (recipient_policy != NULL);
1705 else if (sender == NULL)
1707 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1708 recipient_policy = NULL;
1712 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus");
1713 recipient_policy = NULL;
1717 recipient_policy = NULL;
1719 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1720 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1721 (proposed_recipient == NULL && recipient_policy == NULL));
1724 if (sender_policy &&
1725 !bus_client_policy_check_can_send (sender_policy,
1729 message, &toggles, &log))
1731 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1732 "Rejected send message", toggles,
1733 message, sender, proposed_recipient, requested_reply,
1734 (addressed_recipient == proposed_recipient), error);
1735 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1741 /* We want to drop this message, and are only not doing so for backwards
1743 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1744 "Would reject message", toggles,
1745 message, sender, proposed_recipient, requested_reply,
1749 if (recipient_policy &&
1750 !bus_client_policy_check_can_receive (recipient_policy,
1754 addressed_recipient, proposed_recipient,
1757 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1758 "Rejected receive message", toggles,
1759 message, sender, proposed_recipient, requested_reply,
1760 (addressed_recipient == proposed_recipient), error);
1761 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1765 /* See if limits on size have been exceeded */
1766 if (proposed_recipient &&
1767 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1768 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1770 complain_about_message (context, DBUS_ERROR_LIMITS_EXCEEDED,
1771 "Rejected: destination has a full message queue",
1772 0, message, sender, proposed_recipient, requested_reply, TRUE,
1774 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1778 /* Record that we will allow a reply here in the future (don't
1779 * bother if the recipient is the bus or this is an eavesdropping
1780 * connection). Only the addressed recipient may reply.
1782 * This isn't done for activation attempts because they have no addressed
1783 * or proposed recipient; when we check whether to actually deliver the
1784 * message, later, we'll record the reply expectation at that point.
1786 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1788 addressed_recipient &&
1789 addressed_recipient == proposed_recipient && /* not eavesdropping */
1790 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1792 sender, addressed_recipient,
1795 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1799 _dbus_verbose ("security policy allowing message\n");
1804 bus_context_check_all_watches (BusContext *context)
1807 dbus_bool_t enabled = TRUE;
1809 if (bus_connections_get_n_incomplete (context->connections) >=
1810 bus_context_get_max_incomplete_connections (context))
1815 if (context->watches_enabled == enabled)
1818 context->watches_enabled = enabled;
1820 for (link = _dbus_list_get_first_link (&context->servers);
1822 link = _dbus_list_get_next_link (&context->servers, link))
1824 /* A BusContext might contains several DBusServer (if there are
1825 * several <listen> configuration items) and a DBusServer might
1826 * contain several DBusWatch in its DBusWatchList (if getaddrinfo
1827 * returns several addresses on a dual IPv4-IPv6 stack or if
1828 * systemd passes several fds).
1829 * We want to enable/disable them all.
1831 DBusServer *server = link->data;
1832 _dbus_server_toggle_all_watches (server, enabled);