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;
285 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
288 auth_mechanisms = NULL;
291 _dbus_init_system_log (TRUE);
293 if (flags & BUS_CONTEXT_FLAG_SYSTEMD_ACTIVATION)
294 context->systemd_activation = TRUE;
296 context->systemd_activation = FALSE;
298 /* Check for an existing pid file. Of course this is a race;
299 * we'd have to use fcntl() locks on the pid file to
300 * avoid that. But we want to check for the pid file
301 * before overwriting any existing sockets, etc.
304 if (flags & BUS_CONTEXT_FLAG_WRITE_PID_FILE)
305 pidfile = bus_config_parser_get_pidfile (parser);
312 _dbus_string_init_const (&u, pidfile);
314 if (_dbus_stat (&u, &stbuf, NULL))
320 _dbus_string_init (&p);
321 _dbus_file_get_contents(&p, &u, NULL);
322 _dbus_string_parse_int(&p, 0, &pid, NULL);
323 _dbus_string_free(&p);
325 if ((kill((int)pid, 0))) {
326 dbus_set_error(NULL, DBUS_ERROR_FILE_EXISTS,
327 "pid %ld not running, removing stale pid file\n",
329 _dbus_delete_file(&u, NULL);
332 dbus_set_error (error, DBUS_ERROR_FAILED,
333 "The pid file \"%s\" exists, if the message bus is not running, remove this file",
342 /* keep around the pid filename so we can delete it later */
343 context->pidfile = _dbus_strdup (pidfile);
345 /* note that type may be NULL */
346 context->type = _dbus_strdup (bus_config_parser_get_type (parser));
347 if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
350 user = bus_config_parser_get_user (parser);
353 context->user = _dbus_strdup (user);
354 if (context->user == NULL)
358 /* Set up the prefix for syslog messages */
359 if (!_dbus_string_init (&log_prefix))
361 if (context->type && !strcmp (context->type, "system"))
363 if (!_dbus_string_append (&log_prefix, "[system] "))
366 else if (context->type && !strcmp (context->type, "session"))
368 DBusCredentials *credentials;
370 credentials = _dbus_credentials_new_from_current_process ();
373 if (!_dbus_string_append (&log_prefix, "[session "))
375 _dbus_credentials_unref (credentials);
378 if (!_dbus_credentials_to_string_append (credentials, &log_prefix))
380 _dbus_credentials_unref (credentials);
383 if (!_dbus_string_append (&log_prefix, "] "))
385 _dbus_credentials_unref (credentials);
388 _dbus_credentials_unref (credentials);
390 if (!_dbus_string_steal_data (&log_prefix, &context->log_prefix))
392 _dbus_string_free (&log_prefix);
394 /* Build an array of auth mechanisms */
396 auth_mechanisms_list = bus_config_parser_get_mechanisms (parser);
397 len = _dbus_list_get_length (auth_mechanisms_list);
403 auth_mechanisms = dbus_new0 (char*, len + 1);
404 if (auth_mechanisms == NULL)
408 link = _dbus_list_get_first_link (auth_mechanisms_list);
411 auth_mechanisms[i] = _dbus_strdup (link->data);
412 if (auth_mechanisms[i] == NULL)
414 link = _dbus_list_get_next_link (auth_mechanisms_list, link);
420 auth_mechanisms = NULL;
423 /* Listen on our addresses */
429 server = dbus_server_listen (_dbus_string_get_const_data(address), error);
432 _DBUS_ASSERT_ERROR_IS_SET (error);
435 else if (!setup_server (context, server, auth_mechanisms, error))
437 _DBUS_ASSERT_ERROR_IS_SET (error);
441 if (!_dbus_list_append (&context->servers, server))
446 addresses = bus_config_parser_get_addresses (parser);
448 link = _dbus_list_get_first_link (addresses);
453 server = dbus_server_listen (link->data, 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))
468 link = _dbus_list_get_next_link (addresses, link);
472 context->fork = bus_config_parser_get_fork (parser);
473 context->syslog = bus_config_parser_get_syslog (parser);
474 context->keep_umask = bus_config_parser_get_keep_umask (parser);
475 context->allow_anonymous = bus_config_parser_get_allow_anonymous (parser);
477 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
481 dbus_free_string_array (auth_mechanisms);
486 dbus_free_string_array (auth_mechanisms);
490 /* This code gets executed every time the config files
491 * are parsed: both during BusContext construction
492 * and on reloads. This function is slightly screwy
493 * since it can do a "half reload" in out-of-memory
494 * situations. Realistically, unlikely to ever matter.
497 process_config_every_time (BusContext *context,
498 BusConfigParser *parser,
499 dbus_bool_t is_reload,
502 DBusString full_address;
506 const char *servicehelper;
511 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
516 if (!_dbus_string_init (&full_address))
522 /* get our limits and timeout lengths */
523 bus_config_parser_get_limits (parser, &context->limits);
526 bus_policy_unref (context->policy);
527 context->policy = bus_config_parser_steal_policy (parser);
528 _dbus_assert (context->policy != NULL);
530 /* context->connections is NULL when creating new BusContext */
531 if (context->connections)
533 _dbus_verbose ("Reload policy rules for completed connections\n");
534 retval = bus_connections_reload_policy (context->connections, error);
537 _DBUS_ASSERT_ERROR_IS_SET (error);
542 /* We have to build the address backward, so that
543 * <listen> later in the config file have priority
545 link = _dbus_list_get_last_link (&context->servers);
548 addr = dbus_server_get_address (link->data);
555 if (_dbus_string_get_length (&full_address) > 0)
557 if (!_dbus_string_append (&full_address, ";"))
564 if (!_dbus_string_append (&full_address, addr))
573 link = _dbus_list_get_prev_link (&context->servers, link);
577 dbus_free (context->address);
579 if (!_dbus_string_copy_data (&full_address, &context->address))
585 /* get the service directories */
586 dirs = bus_config_parser_get_service_dirs (parser);
588 /* and the service helper */
589 servicehelper = bus_config_parser_get_servicehelper (parser);
591 s = _dbus_strdup(servicehelper);
592 if (s == NULL && servicehelper != NULL)
599 dbus_free(context->servicehelper);
600 context->servicehelper = s;
603 /* Create activation subsystem */
604 if (context->activation)
606 if (!bus_activation_reload (context->activation, &full_address, dirs, error))
611 context->activation = bus_activation_new (context, &full_address, dirs, error);
614 if (context->activation == NULL)
616 _DBUS_ASSERT_ERROR_IS_SET (error);
620 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
624 _dbus_string_free (&full_address);
633 list_concat_new (DBusList **a,
641 for (link = _dbus_list_get_first_link (a); link; link = _dbus_list_get_next_link (a, link))
643 if (!_dbus_list_append (result, link->data))
646 for (link = _dbus_list_get_first_link (b); link; link = _dbus_list_get_next_link (b, link))
648 if (!_dbus_list_append (result, link->data))
654 _dbus_list_clear (result);
659 raise_file_descriptor_limit (BusContext *context)
662 DBusError error = DBUS_ERROR_INIT;
664 /* we only do this once */
665 if (context->initial_fd_limit != NULL)
668 context->initial_fd_limit = _dbus_rlimit_save_fd_limit (&error);
670 if (context->initial_fd_limit == NULL)
672 bus_context_log (context, DBUS_SYSTEM_LOG_WARNING,
673 "%s: %s", error.name, error.message);
674 dbus_error_free (&error);
678 /* We used to compute a suitable rlimit based on the configured number
679 * of connections, but that breaks down as soon as we allow fd-passing,
680 * because each connection is allowed to pass 64 fds to us, and if
681 * they all did, we'd hit kernel limits. We now hard-code 64k as a
682 * good limit, like systemd does: that's enough to avoid DoS from
683 * anything short of multiple uids conspiring against us.
685 if (!_dbus_rlimit_raise_fd_limit_if_privileged (65536, &error))
687 bus_context_log (context, DBUS_SYSTEM_LOG_WARNING,
688 "%s: %s", error.name, error.message);
689 dbus_error_free (&error);
696 process_config_postinit (BusContext *context,
697 BusConfigParser *parser,
700 DBusHashTable *service_context_table;
701 DBusList *watched_dirs = NULL;
703 raise_file_descriptor_limit (context);
705 service_context_table = bus_config_parser_steal_service_context_table (parser);
706 if (!bus_registry_set_service_context_table (context->registry,
707 service_context_table))
713 _dbus_hash_table_unref (service_context_table);
715 /* We need to monitor both the configuration directories and directories
716 * containing .service files.
718 if (!list_concat_new (bus_config_parser_get_conf_dirs (parser),
719 bus_config_parser_get_service_dirs (parser),
726 bus_set_watched_dirs (context, &watched_dirs);
728 _dbus_list_clear (&watched_dirs);
734 bus_context_new (const DBusString *config_file,
735 BusContextFlags flags,
736 DBusPipe *print_addr_pipe,
737 DBusPipe *print_pid_pipe,
738 const DBusString *address,
742 BusConfigParser *parser;
744 _dbus_assert ((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 ||
745 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS) == 0);
747 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
752 if (!dbus_server_allocate_data_slot (&server_data_slot))
758 context = dbus_new0 (BusContext, 1);
764 context->refcount = 1;
766 if (!_dbus_generate_uuid (&context->uuid, error))
769 if (!_dbus_string_copy_data (config_file, &context->config_file))
775 context->loop = _dbus_loop_new ();
776 if (context->loop == NULL)
782 context->watches_enabled = TRUE;
784 context->registry = bus_registry_new (context);
785 if (context->registry == NULL)
791 parser = bus_config_load (config_file, TRUE, NULL, error);
794 _DBUS_ASSERT_ERROR_IS_SET (error);
798 if (!process_config_first_time_only (context, parser, address, flags, error))
800 _DBUS_ASSERT_ERROR_IS_SET (error);
803 if (!process_config_every_time (context, parser, FALSE, error))
805 _DBUS_ASSERT_ERROR_IS_SET (error);
809 /* we need another ref of the server data slot for the context
812 if (!dbus_server_allocate_data_slot (&server_data_slot))
813 _dbus_assert_not_reached ("second ref of server data slot failed");
815 /* Note that we don't know whether the print_addr_pipe is
816 * one of the sockets we're using to listen on, or some
817 * other random thing. But I think the answer is "don't do
820 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
823 const char *a = bus_context_get_address (context);
826 _dbus_assert (a != NULL);
827 if (!_dbus_string_init (&addr))
833 if (!_dbus_string_append (&addr, a) ||
834 !_dbus_string_append (&addr, "\n"))
836 _dbus_string_free (&addr);
841 bytes = _dbus_string_get_length (&addr);
842 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
844 /* pipe write returns an error on failure but not short write */
845 if (error != NULL && !dbus_error_is_set (error))
847 dbus_set_error (error, DBUS_ERROR_FAILED,
848 "Printing message bus address: did not write all bytes\n");
850 _dbus_string_free (&addr);
854 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
855 _dbus_pipe_close (print_addr_pipe, NULL);
857 _dbus_string_free (&addr);
860 context->connections = bus_connections_new (context);
861 if (context->connections == NULL)
867 context->matchmaker = bus_matchmaker_new ();
868 if (context->matchmaker == NULL)
874 /* check user before we fork */
875 if (context->user != NULL)
877 if (!_dbus_verify_daemon_user (context->user))
879 dbus_set_error (error, DBUS_ERROR_FAILED,
880 "Could not get UID and GID for username \"%s\"",
886 /* Now become a daemon if appropriate and write out pid file in any case */
890 if (context->pidfile)
891 _dbus_string_init_const (&u, context->pidfile);
893 if (((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 && context->fork) ||
894 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS))
896 _dbus_verbose ("Forking and becoming daemon\n");
898 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
901 context->keep_umask))
903 _DBUS_ASSERT_ERROR_IS_SET (error);
909 _dbus_verbose ("Fork not requested\n");
911 /* Need to write PID file and to PID pipe for ourselves,
912 * not for the child process. This is a no-op if the pidfile
913 * is NULL and print_pid_pipe is NULL.
915 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
920 _DBUS_ASSERT_ERROR_IS_SET (error);
926 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
927 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
928 _dbus_pipe_close (print_pid_pipe, NULL);
930 /* Here we change our credentials if required,
931 * as soon as we've set up our sockets and pidfile.
932 * This must be done before initializing LSMs, so that the netlink
933 * monitoring thread started by avc_init() will not lose CAP_AUDIT_WRITE
934 * when the main thread calls setuid().
935 * https://bugs.freedesktop.org/show_bug.cgi?id=92832
937 if (context->user != NULL)
939 if (!_dbus_change_to_daemon_user (context->user, error))
941 _DBUS_ASSERT_ERROR_IS_SET (error);
946 /* Auditing should be initialized before LSMs, so that the LSMs are able
947 * to log audit-events that happen during their initialization.
949 bus_audit_init (context);
951 if (!bus_selinux_full_init ())
953 bus_context_log (context, DBUS_SYSTEM_LOG_FATAL, "SELinux enabled but D-Bus initialization failed; check system log\n");
956 if (!bus_apparmor_full_init (error))
958 _DBUS_ASSERT_ERROR_IS_SET (error);
962 if (bus_apparmor_enabled ())
964 /* Only print AppArmor mediation message when syslog support is enabled */
966 bus_context_log (context, DBUS_SYSTEM_LOG_INFO,
967 "AppArmor D-Bus mediation is enabled\n");
970 /* When SELinux is used, this must happen after bus_selinux_full_init()
971 * so that it has access to the access vector cache, which is required
972 * to process <associate/> elements.
973 * http://lists.freedesktop.org/archives/dbus/2008-October/010491.html
975 if (!process_config_postinit (context, parser, error))
977 _DBUS_ASSERT_ERROR_IS_SET (error);
983 bus_config_parser_unref (parser);
987 dbus_server_free_data_slot (&server_data_slot);
993 bus_config_parser_unref (parser);
995 bus_context_unref (context);
997 if (server_data_slot >= 0)
998 dbus_server_free_data_slot (&server_data_slot);
1004 bus_context_get_id (BusContext *context,
1007 return _dbus_uuid_encode (&context->uuid, uuid);
1011 bus_context_reload_config (BusContext *context,
1014 BusConfigParser *parser;
1015 DBusString config_file;
1018 /* Flush the user database cache */
1019 _dbus_flush_caches ();
1022 _dbus_string_init_const (&config_file, context->config_file);
1023 parser = bus_config_load (&config_file, TRUE, NULL, error);
1026 _DBUS_ASSERT_ERROR_IS_SET (error);
1030 if (!process_config_every_time (context, parser, TRUE, error))
1032 _DBUS_ASSERT_ERROR_IS_SET (error);
1035 if (!process_config_postinit (context, parser, error))
1037 _DBUS_ASSERT_ERROR_IS_SET (error);
1042 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
1045 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
1047 bus_config_parser_unref (parser);
1052 shutdown_server (BusContext *context,
1055 if (server == NULL ||
1056 !dbus_server_get_is_connected (server))
1059 if (!dbus_server_set_watch_functions (server,
1063 _dbus_assert_not_reached ("setting watch functions to NULL failed");
1065 if (!dbus_server_set_timeout_functions (server,
1069 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
1071 dbus_server_disconnect (server);
1075 bus_context_shutdown (BusContext *context)
1079 link = _dbus_list_get_first_link (&context->servers);
1080 while (link != NULL)
1082 shutdown_server (context, link->data);
1084 link = _dbus_list_get_next_link (&context->servers, link);
1089 bus_context_ref (BusContext *context)
1091 _dbus_assert (context->refcount > 0);
1092 context->refcount += 1;
1098 bus_context_unref (BusContext *context)
1100 _dbus_assert (context->refcount > 0);
1101 context->refcount -= 1;
1103 if (context->refcount == 0)
1107 _dbus_verbose ("Finalizing bus context %p\n", context);
1109 bus_context_shutdown (context);
1111 if (context->connections)
1113 bus_connections_unref (context->connections);
1114 context->connections = NULL;
1117 if (context->registry)
1119 bus_registry_unref (context->registry);
1120 context->registry = NULL;
1123 if (context->activation)
1125 bus_activation_unref (context->activation);
1126 context->activation = NULL;
1129 link = _dbus_list_get_first_link (&context->servers);
1130 while (link != NULL)
1132 dbus_server_unref (link->data);
1134 link = _dbus_list_get_next_link (&context->servers, link);
1136 _dbus_list_clear (&context->servers);
1138 if (context->policy)
1140 bus_policy_unref (context->policy);
1141 context->policy = NULL;
1146 _dbus_loop_unref (context->loop);
1147 context->loop = NULL;
1150 if (context->matchmaker)
1152 bus_matchmaker_unref (context->matchmaker);
1153 context->matchmaker = NULL;
1156 dbus_free (context->config_file);
1157 dbus_free (context->log_prefix);
1158 dbus_free (context->type);
1159 dbus_free (context->address);
1160 dbus_free (context->user);
1161 dbus_free (context->servicehelper);
1163 if (context->pidfile)
1166 _dbus_string_init_const (&u, context->pidfile);
1168 /* Deliberately ignore errors here, since there's not much
1169 * we can do about it, and we're exiting anyways.
1171 _dbus_delete_file (&u, NULL);
1173 dbus_free (context->pidfile);
1176 if (context->initial_fd_limit)
1177 _dbus_rlimit_free (context->initial_fd_limit);
1179 dbus_free (context);
1181 dbus_server_free_data_slot (&server_data_slot);
1185 /* type may be NULL */
1187 bus_context_get_type (BusContext *context)
1189 return context->type;
1193 bus_context_get_address (BusContext *context)
1195 return context->address;
1199 bus_context_get_servicehelper (BusContext *context)
1201 return context->servicehelper;
1205 bus_context_get_systemd_activation (BusContext *context)
1207 return context->systemd_activation;
1211 bus_context_get_registry (BusContext *context)
1213 return context->registry;
1217 bus_context_get_connections (BusContext *context)
1219 return context->connections;
1223 bus_context_get_activation (BusContext *context)
1225 return context->activation;
1229 bus_context_get_matchmaker (BusContext *context)
1231 return context->matchmaker;
1235 bus_context_get_loop (BusContext *context)
1237 return context->loop;
1241 bus_context_allow_unix_user (BusContext *context,
1244 return bus_policy_allow_unix_user (context->policy,
1248 /* For now this is never actually called because the default
1249 * DBusConnection behavior of 'same user that owns the bus can connect'
1250 * is all it would do.
1253 bus_context_allow_windows_user (BusContext *context,
1254 const char *windows_sid)
1256 return bus_policy_allow_windows_user (context->policy,
1261 bus_context_get_policy (BusContext *context)
1263 return context->policy;
1267 bus_context_create_client_policy (BusContext *context,
1268 DBusConnection *connection,
1271 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1272 return bus_policy_create_client_policy (context->policy, connection,
1277 bus_context_get_activation_timeout (BusContext *context)
1280 return context->limits.activation_timeout;
1284 bus_context_get_auth_timeout (BusContext *context)
1286 return context->limits.auth_timeout;
1290 bus_context_get_pending_fd_timeout (BusContext *context)
1292 return context->limits.pending_fd_timeout;
1296 bus_context_get_max_completed_connections (BusContext *context)
1298 return context->limits.max_completed_connections;
1302 bus_context_get_max_incomplete_connections (BusContext *context)
1304 return context->limits.max_incomplete_connections;
1308 bus_context_get_max_connections_per_user (BusContext *context)
1310 return context->limits.max_connections_per_user;
1314 bus_context_get_max_pending_activations (BusContext *context)
1316 return context->limits.max_pending_activations;
1320 bus_context_get_max_services_per_connection (BusContext *context)
1322 return context->limits.max_services_per_connection;
1326 bus_context_get_max_match_rules_per_connection (BusContext *context)
1328 return context->limits.max_match_rules_per_connection;
1332 bus_context_get_max_replies_per_connection (BusContext *context)
1334 return context->limits.max_replies_per_connection;
1338 bus_context_get_reply_timeout (BusContext *context)
1340 return context->limits.reply_timeout;
1344 bus_context_get_initial_fd_limit (BusContext *context)
1346 return context->initial_fd_limit;
1350 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1354 if (!context->syslog)
1356 /* we're not syslogging; just output to stderr */
1357 va_start (args, msg);
1358 vfprintf (stderr, msg, args);
1359 fprintf (stderr, "\n");
1362 if (severity == DBUS_SYSTEM_LOG_FATAL)
1368 va_start (args, msg);
1370 if (context->log_prefix)
1372 DBusString full_msg;
1374 if (!_dbus_string_init (&full_msg))
1376 if (!_dbus_string_append (&full_msg, context->log_prefix))
1378 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1381 _dbus_system_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1383 _dbus_string_free (&full_msg);
1386 _dbus_system_logv (severity, msg, args);
1392 static inline const char *
1393 nonnull (const char *maybe_null,
1394 const char *if_null)
1396 return (maybe_null ? maybe_null : if_null);
1400 bus_context_log_literal (BusContext *context,
1401 DBusSystemLogSeverity severity,
1404 if (!context->syslog)
1406 fputs (msg, stderr);
1407 fputc ('\n', stderr);
1409 if (severity == DBUS_SYSTEM_LOG_FATAL)
1414 _dbus_system_log (severity, "%s%s", nonnull (context->log_prefix, ""),
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 proposed_recipient or sender definitely means the bus driver.
1516 * NULL for addressed_recipient may mean the bus driver, or may mean
1517 * no destination was specified in the message (e.g. a signal).
1520 bus_context_check_security_policy (BusContext *context,
1521 BusTransaction *transaction,
1522 DBusConnection *sender,
1523 DBusConnection *addressed_recipient,
1524 DBusConnection *proposed_recipient,
1525 DBusMessage *message,
1528 const char *src, *dest;
1529 BusClientPolicy *sender_policy;
1530 BusClientPolicy *recipient_policy;
1531 dbus_int32_t toggles;
1534 dbus_bool_t requested_reply;
1536 type = dbus_message_get_type (message);
1537 src = dbus_message_get_sender (message);
1538 dest = dbus_message_get_destination (message);
1540 /* dispatch.c was supposed to ensure these invariants */
1541 _dbus_assert (dest != NULL ||
1542 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1543 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1544 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1545 addressed_recipient != NULL ||
1546 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1550 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1551 case DBUS_MESSAGE_TYPE_SIGNAL:
1552 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1553 case DBUS_MESSAGE_TYPE_ERROR:
1557 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1560 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1561 "Message bus will not accept messages of unknown type\n");
1566 requested_reply = FALSE;
1570 if (bus_connection_is_active (sender))
1572 sender_policy = bus_connection_get_policy (sender);
1573 _dbus_assert (sender_policy != NULL);
1575 /* Fill in requested_reply variable with TRUE if this is a
1576 * reply and the reply was pending.
1578 if (dbus_message_get_reply_serial (message) != 0)
1580 if (proposed_recipient != NULL /* not to the bus driver */ &&
1581 addressed_recipient == proposed_recipient /* not eavesdropping */)
1585 dbus_error_init (&error2);
1586 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1588 sender, addressed_recipient, message,
1590 if (dbus_error_is_set (&error2))
1592 dbus_move_error (&error2, error);
1600 sender_policy = NULL;
1603 /* First verify the SELinux access controls. If allowed then
1604 * go on with the standard checks.
1606 if (!bus_selinux_allows_send (sender, proposed_recipient,
1607 dbus_message_type_to_string (dbus_message_get_type (message)),
1608 dbus_message_get_interface (message),
1609 dbus_message_get_member (message),
1610 dbus_message_get_error_name (message),
1611 dest ? dest : DBUS_SERVICE_DBUS, error))
1613 if (error != NULL && !dbus_error_is_set (error))
1615 /* don't syslog this, just set the error: avc_has_perm should
1616 * have already written to either the audit log or syslog */
1617 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1618 "An SELinux policy prevents this sender from sending this "
1619 "message to this recipient",
1620 0, message, sender, proposed_recipient, FALSE, FALSE, error);
1621 _dbus_verbose ("SELinux security check denying send to service\n");
1627 /* next verify AppArmor access controls. If allowed then
1628 * go on with the standard checks.
1630 if (!bus_apparmor_allows_send (sender, proposed_recipient,
1632 bus_context_get_type (context),
1633 dbus_message_get_type (message),
1634 dbus_message_get_path (message),
1635 dbus_message_get_interface (message),
1636 dbus_message_get_member (message),
1637 dbus_message_get_error_name (message),
1638 dest ? dest : DBUS_SERVICE_DBUS,
1639 src ? src : DBUS_SERVICE_DBUS,
1643 if (!bus_connection_is_active (sender))
1645 /* Policy for inactive connections is that they can only send
1646 * the hello message to the bus driver
1648 if (proposed_recipient == NULL &&
1649 dbus_message_is_method_call (message,
1650 DBUS_INTERFACE_DBUS,
1653 _dbus_verbose ("security check allowing %s message\n",
1659 _dbus_verbose ("security check disallowing non-%s message\n",
1662 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1663 "Client tried to send a message other than %s without being registered",
1672 sender_policy = NULL;
1674 /* If the sender is the bus driver, we assume any reply was a
1675 * requested reply as bus driver won't send bogus ones
1677 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1678 dbus_message_get_reply_serial (message) != 0)
1679 requested_reply = TRUE;
1682 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1683 (sender == NULL && sender_policy == NULL));
1685 if (proposed_recipient != NULL)
1687 /* only the bus driver can send to an inactive recipient (as it
1688 * owns no services, so other apps can't address it). Inactive
1689 * recipients can receive any message.
1691 if (bus_connection_is_active (proposed_recipient))
1693 recipient_policy = bus_connection_get_policy (proposed_recipient);
1694 _dbus_assert (recipient_policy != NULL);
1696 else if (sender == NULL)
1698 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1699 recipient_policy = NULL;
1703 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus\n");
1704 recipient_policy = NULL;
1708 recipient_policy = NULL;
1710 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1711 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1712 (proposed_recipient == NULL && recipient_policy == NULL));
1715 if (sender_policy &&
1716 !bus_client_policy_check_can_send (sender_policy,
1720 message, &toggles, &log))
1722 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1723 "Rejected send message", toggles,
1724 message, sender, proposed_recipient, requested_reply,
1725 (addressed_recipient == proposed_recipient), error);
1726 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1732 /* We want to drop this message, and are only not doing so for backwards
1734 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1735 "Would reject message", toggles,
1736 message, sender, proposed_recipient, requested_reply,
1740 if (recipient_policy &&
1741 !bus_client_policy_check_can_receive (recipient_policy,
1745 addressed_recipient, proposed_recipient,
1748 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1749 "Rejected receive message", toggles,
1750 message, sender, proposed_recipient, requested_reply,
1751 (addressed_recipient == proposed_recipient), error);
1752 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1756 /* See if limits on size have been exceeded */
1757 if (proposed_recipient &&
1758 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1759 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1761 complain_about_message (context, DBUS_ERROR_LIMITS_EXCEEDED,
1762 "Rejected: destination has a full message queue",
1763 0, message, sender, proposed_recipient, requested_reply, TRUE,
1765 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1769 /* Record that we will allow a reply here in the future (don't
1770 * bother if the recipient is the bus or this is an eavesdropping
1771 * connection). Only the addressed recipient may reply.
1773 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1775 addressed_recipient &&
1776 addressed_recipient == proposed_recipient && /* not eavesdropping */
1777 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1779 sender, addressed_recipient,
1782 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1786 _dbus_verbose ("security policy allowing message\n");
1791 bus_context_check_all_watches (BusContext *context)
1794 dbus_bool_t enabled = TRUE;
1796 if (bus_connections_get_n_incomplete (context->connections) >=
1797 bus_context_get_max_incomplete_connections (context))
1802 if (context->watches_enabled == enabled)
1805 context->watches_enabled = enabled;
1807 for (link = _dbus_list_get_first_link (&context->servers);
1809 link = _dbus_list_get_next_link (&context->servers, link))
1811 /* A BusContext might contains several DBusServer (if there are
1812 * several <listen> configuration items) and a DBusServer might
1813 * contain several DBusWatch in its DBusWatchList (if getaddrinfo
1814 * returns several addresses on a dual IPv4-IPv6 stack or if
1815 * systemd passes several fds).
1816 * We want to enable/disable them all.
1818 DBusServer *server = link->data;
1819 _dbus_server_toggle_all_watches (server, enabled);