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
30 #include "activation.h"
31 #include "connection.h"
35 #include "config-parser.h"
40 #include "dir-watch.h"
42 #include <dbus/dbus-auth.h>
43 #include <dbus/dbus-list.h>
44 #include <dbus/dbus-hash.h>
45 #include <dbus/dbus-credentials.h>
46 #include <dbus/dbus-internals.h>
47 #include <dbus/dbus-server-protected.h>
66 BusConnections *connections;
67 BusActivation *activation;
68 BusRegistry *registry;
70 BusMatchmaker *matchmaker;
73 DBusRLimit *initial_fd_limit;
74 unsigned int fork : 1;
75 unsigned int syslog : 1;
76 unsigned int keep_umask : 1;
77 unsigned int allow_anonymous : 1;
78 unsigned int systemd_activation : 1;
79 dbus_bool_t watches_enabled;
82 static dbus_int32_t server_data_slot = -1;
89 #define BUS_SERVER_DATA(server) (dbus_server_get_data ((server), server_data_slot))
92 server_get_context (DBusServer *server)
97 /* this data slot was allocated by the BusContext */
98 _dbus_assert (server_data_slot >= 0);
100 bd = BUS_SERVER_DATA (server);
102 /* every DBusServer in the dbus-daemon has gone through setup_server() */
103 _dbus_assert (bd != NULL);
105 context = bd->context;
111 add_server_watch (DBusWatch *watch,
114 DBusServer *server = data;
117 context = server_get_context (server);
119 return _dbus_loop_add_watch (context->loop, watch);
123 remove_server_watch (DBusWatch *watch,
126 DBusServer *server = data;
129 context = server_get_context (server);
131 _dbus_loop_remove_watch (context->loop, watch);
135 toggle_server_watch (DBusWatch *watch,
138 DBusServer *server = data;
141 context = server_get_context (server);
143 _dbus_loop_toggle_watch (context->loop, watch);
147 add_server_timeout (DBusTimeout *timeout,
150 DBusServer *server = data;
153 context = server_get_context (server);
155 return _dbus_loop_add_timeout (context->loop, timeout);
159 remove_server_timeout (DBusTimeout *timeout,
162 DBusServer *server = data;
165 context = server_get_context (server);
167 _dbus_loop_remove_timeout (context->loop, timeout);
171 new_connection_callback (DBusServer *server,
172 DBusConnection *new_connection,
175 BusContext *context = data;
177 /* If this fails it logs a warning, so we don't need to do that */
178 if (!bus_connections_setup_connection (context->connections, new_connection))
180 /* if we don't do this, it will get unref'd without
181 * being disconnected... kind of strange really
182 * that we have to do this, people won't get it right
185 dbus_connection_close (new_connection);
188 dbus_connection_set_max_received_size (new_connection,
189 context->limits.max_incoming_bytes);
191 dbus_connection_set_max_message_size (new_connection,
192 context->limits.max_message_size);
194 dbus_connection_set_max_received_unix_fds (new_connection,
195 context->limits.max_incoming_unix_fds);
197 dbus_connection_set_max_message_unix_fds (new_connection,
198 context->limits.max_message_unix_fds);
200 dbus_connection_set_allow_anonymous (new_connection,
201 context->allow_anonymous);
203 /* on OOM, we won't have ref'd the connection so it will die. */
207 free_server_data (void *data)
209 BusServerData *bd = data;
215 setup_server (BusContext *context,
217 char **auth_mechanisms,
222 bd = dbus_new0 (BusServerData, 1);
223 if (bd == NULL || !dbus_server_set_data (server,
225 bd, free_server_data))
232 bd->context = context;
234 if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms))
240 dbus_server_set_new_connection_function (server,
241 new_connection_callback,
244 if (!dbus_server_set_watch_functions (server,
255 if (!dbus_server_set_timeout_functions (server,
257 remove_server_timeout,
268 /* This code only gets executed the first time the
269 * config files are parsed. It is not executed
270 * when config files are reloaded.
273 process_config_first_time_only (BusContext *context,
274 BusConfigParser *parser,
275 const DBusString *address,
276 BusContextFlags flags,
279 DBusString log_prefix;
281 DBusList **addresses;
282 const char *user, *pidfile;
283 char **auth_mechanisms;
284 DBusList **auth_mechanisms_list;
287 DBusLogFlags log_flags = DBUS_LOG_FLAGS_STDERR;
289 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
292 auth_mechanisms = NULL;
295 if (flags & BUS_CONTEXT_FLAG_SYSLOG_ALWAYS)
297 context->syslog = TRUE;
298 log_flags |= DBUS_LOG_FLAGS_SYSTEM_LOG;
300 if (flags & BUS_CONTEXT_FLAG_SYSLOG_ONLY)
301 log_flags &= ~DBUS_LOG_FLAGS_STDERR;
303 else if (flags & BUS_CONTEXT_FLAG_SYSLOG_NEVER)
305 context->syslog = FALSE;
309 context->syslog = bus_config_parser_get_syslog (parser);
312 log_flags |= DBUS_LOG_FLAGS_SYSTEM_LOG;
315 _dbus_init_system_log ("dbus-daemon", log_flags);
317 if (flags & BUS_CONTEXT_FLAG_SYSTEMD_ACTIVATION)
318 context->systemd_activation = TRUE;
320 context->systemd_activation = FALSE;
322 /* Check for an existing pid file. Of course this is a race;
323 * we'd have to use fcntl() locks on the pid file to
324 * avoid that. But we want to check for the pid file
325 * before overwriting any existing sockets, etc.
328 if (flags & BUS_CONTEXT_FLAG_WRITE_PID_FILE)
329 pidfile = bus_config_parser_get_pidfile (parser);
336 _dbus_string_init_const (&u, pidfile);
338 if (_dbus_stat (&u, &stbuf, NULL))
344 _dbus_string_init (&p);
345 _dbus_file_get_contents(&p, &u, NULL);
346 _dbus_string_parse_int(&p, 0, &pid, NULL);
347 _dbus_string_free(&p);
349 if ((kill((int)pid, 0))) {
350 dbus_set_error(NULL, DBUS_ERROR_FILE_EXISTS,
351 "pid %ld not running, removing stale pid file\n",
353 _dbus_delete_file(&u, NULL);
356 dbus_set_error (error, DBUS_ERROR_FAILED,
357 "The pid file \"%s\" exists, if the message bus is not running, remove this file",
366 /* keep around the pid filename so we can delete it later */
367 context->pidfile = _dbus_strdup (pidfile);
369 /* note that type may be NULL */
370 context->type = _dbus_strdup (bus_config_parser_get_type (parser));
371 if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
374 user = bus_config_parser_get_user (parser);
377 context->user = _dbus_strdup (user);
378 if (context->user == NULL)
382 /* Set up the prefix for syslog messages */
383 if (!_dbus_string_init (&log_prefix))
385 if (context->type && !strcmp (context->type, "system"))
387 if (!_dbus_string_append (&log_prefix, "[system] "))
390 else if (context->type && !strcmp (context->type, "session"))
392 DBusCredentials *credentials;
394 credentials = _dbus_credentials_new_from_current_process ();
397 if (!_dbus_string_append (&log_prefix, "[session "))
399 _dbus_credentials_unref (credentials);
402 if (!_dbus_credentials_to_string_append (credentials, &log_prefix))
404 _dbus_credentials_unref (credentials);
407 if (!_dbus_string_append (&log_prefix, "] "))
409 _dbus_credentials_unref (credentials);
412 _dbus_credentials_unref (credentials);
414 if (!_dbus_string_steal_data (&log_prefix, &context->log_prefix))
416 _dbus_string_free (&log_prefix);
418 /* Build an array of auth mechanisms */
420 auth_mechanisms_list = bus_config_parser_get_mechanisms (parser);
421 len = _dbus_list_get_length (auth_mechanisms_list);
427 auth_mechanisms = dbus_new0 (char*, len + 1);
428 if (auth_mechanisms == NULL)
432 link = _dbus_list_get_first_link (auth_mechanisms_list);
436 _dbus_string_init_const (&name, link->data);
437 if (!_dbus_auth_is_supported_mechanism (&name))
440 if (!_dbus_string_init (&list))
443 if (!_dbus_auth_dump_supported_mechanisms (&list))
445 _dbus_string_free (&list);
448 dbus_set_error (error, DBUS_ERROR_FAILED,
449 "Unsupported auth mechanism \"%s\" in bus config file detected. Supported mechanisms are \"%s\".",
451 _dbus_string_get_const_data (&list));
452 _dbus_string_free (&list);
455 auth_mechanisms[i] = _dbus_strdup (link->data);
456 if (auth_mechanisms[i] == NULL)
458 link = _dbus_list_get_next_link (auth_mechanisms_list, link);
464 auth_mechanisms = NULL;
467 /* Listen on our addresses */
473 server = dbus_server_listen (_dbus_string_get_const_data(address), error);
476 _DBUS_ASSERT_ERROR_IS_SET (error);
479 else if (!setup_server (context, server, auth_mechanisms, error))
481 _DBUS_ASSERT_ERROR_IS_SET (error);
485 if (!_dbus_list_append (&context->servers, server))
490 addresses = bus_config_parser_get_addresses (parser);
492 link = _dbus_list_get_first_link (addresses);
497 server = dbus_server_listen (link->data, error);
500 _DBUS_ASSERT_ERROR_IS_SET (error);
503 else if (!setup_server (context, server, auth_mechanisms, error))
505 _DBUS_ASSERT_ERROR_IS_SET (error);
509 if (!_dbus_list_append (&context->servers, server))
512 link = _dbus_list_get_next_link (addresses, link);
516 context->fork = bus_config_parser_get_fork (parser);
517 context->keep_umask = bus_config_parser_get_keep_umask (parser);
518 context->allow_anonymous = bus_config_parser_get_allow_anonymous (parser);
520 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
524 dbus_free_string_array (auth_mechanisms);
529 dbus_free_string_array (auth_mechanisms);
533 /* This code gets executed every time the config files
534 * are parsed: both during BusContext construction
535 * and on reloads. This function is slightly screwy
536 * since it can do a "half reload" in out-of-memory
537 * situations. Realistically, unlikely to ever matter.
540 process_config_every_time (BusContext *context,
541 BusConfigParser *parser,
542 dbus_bool_t is_reload,
545 DBusString full_address;
549 const char *servicehelper;
554 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
559 if (!_dbus_string_init (&full_address))
565 /* get our limits and timeout lengths */
566 bus_config_parser_get_limits (parser, &context->limits);
569 bus_policy_unref (context->policy);
570 context->policy = bus_config_parser_steal_policy (parser);
571 _dbus_assert (context->policy != NULL);
573 /* context->connections is NULL when creating new BusContext */
574 if (context->connections)
576 _dbus_verbose ("Reload policy rules for completed connections\n");
577 retval = bus_connections_reload_policy (context->connections, error);
580 _DBUS_ASSERT_ERROR_IS_SET (error);
585 /* We have to build the address backward, so that
586 * <listen> later in the config file have priority
588 link = _dbus_list_get_last_link (&context->servers);
591 addr = dbus_server_get_address (link->data);
598 if (_dbus_string_get_length (&full_address) > 0)
600 if (!_dbus_string_append (&full_address, ";"))
607 if (!_dbus_string_append (&full_address, addr))
616 link = _dbus_list_get_prev_link (&context->servers, link);
620 dbus_free (context->address);
622 if (!_dbus_string_copy_data (&full_address, &context->address))
628 /* get the service directories */
629 dirs = bus_config_parser_get_service_dirs (parser);
631 /* and the service helper */
632 servicehelper = bus_config_parser_get_servicehelper (parser);
634 s = _dbus_strdup(servicehelper);
635 if (s == NULL && servicehelper != NULL)
642 dbus_free(context->servicehelper);
643 context->servicehelper = s;
646 /* Create activation subsystem */
647 if (context->activation)
649 if (!bus_activation_reload (context->activation, &full_address, dirs, error))
654 context->activation = bus_activation_new (context, &full_address, dirs, error);
657 if (context->activation == NULL)
659 _DBUS_ASSERT_ERROR_IS_SET (error);
663 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
667 _dbus_string_free (&full_address);
676 raise_file_descriptor_limit (BusContext *context)
679 DBusError error = DBUS_ERROR_INIT;
681 /* we only do this once */
682 if (context->initial_fd_limit != NULL)
685 context->initial_fd_limit = _dbus_rlimit_save_fd_limit (&error);
687 if (context->initial_fd_limit == NULL)
689 bus_context_log (context, DBUS_SYSTEM_LOG_WARNING,
690 "%s: %s", error.name, error.message);
691 dbus_error_free (&error);
695 /* We used to compute a suitable rlimit based on the configured number
696 * of connections, but that breaks down as soon as we allow fd-passing,
697 * because each connection is allowed to pass 64 fds to us, and if
698 * they all did, we'd hit kernel limits. We now hard-code a good
699 * limit that is enough to avoid DoS from anything short of multiple
700 * uids conspiring against us, much like systemd does.
702 if (!_dbus_rlimit_raise_fd_limit (&error))
704 bus_context_log (context, DBUS_SYSTEM_LOG_WARNING,
705 "%s: %s", error.name, error.message);
706 dbus_error_free (&error);
713 process_config_postinit (BusContext *context,
714 BusConfigParser *parser,
717 DBusHashTable *service_context_table;
718 DBusList *watched_dirs = NULL;
720 service_context_table = bus_config_parser_steal_service_context_table (parser);
721 if (!bus_registry_set_service_context_table (context->registry,
722 service_context_table))
728 _dbus_hash_table_unref (service_context_table);
730 /* We need to monitor both the configuration directories and directories
731 * containing .service files.
733 if (!bus_config_parser_get_watched_dirs (parser, &watched_dirs))
739 bus_set_watched_dirs (context, &watched_dirs);
741 _dbus_list_clear (&watched_dirs);
747 bus_context_new (const DBusString *config_file,
748 BusContextFlags flags,
749 DBusPipe *print_addr_pipe,
750 DBusPipe *print_pid_pipe,
751 const DBusString *address,
755 BusConfigParser *parser;
757 _dbus_assert ((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 ||
758 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS) == 0);
760 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
765 if (!dbus_server_allocate_data_slot (&server_data_slot))
771 context = dbus_new0 (BusContext, 1);
777 context->refcount = 1;
779 if (!_dbus_generate_uuid (&context->uuid, error))
782 if (!_dbus_string_copy_data (config_file, &context->config_file))
788 context->loop = _dbus_loop_new ();
789 if (context->loop == NULL)
795 context->watches_enabled = TRUE;
797 context->registry = bus_registry_new (context);
798 if (context->registry == NULL)
804 parser = bus_config_load (config_file, TRUE, NULL, error);
807 _DBUS_ASSERT_ERROR_IS_SET (error);
811 if (!process_config_first_time_only (context, parser, address, flags, error))
813 _DBUS_ASSERT_ERROR_IS_SET (error);
816 if (!process_config_every_time (context, parser, FALSE, error))
818 _DBUS_ASSERT_ERROR_IS_SET (error);
822 /* we need another ref of the server data slot for the context
825 if (!dbus_server_allocate_data_slot (&server_data_slot))
826 _dbus_assert_not_reached ("second ref of server data slot failed");
828 /* Note that we don't know whether the print_addr_pipe is
829 * one of the sockets we're using to listen on, or some
830 * other random thing. But I think the answer is "don't do
833 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
836 const char *a = bus_context_get_address (context);
839 _dbus_assert (a != NULL);
840 if (!_dbus_string_init (&addr))
846 if (!_dbus_string_append (&addr, a) ||
847 !_dbus_string_append (&addr, "\n"))
849 _dbus_string_free (&addr);
854 bytes = _dbus_string_get_length (&addr);
855 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
857 /* pipe write returns an error on failure but not short write */
858 if (error != NULL && !dbus_error_is_set (error))
860 dbus_set_error (error, DBUS_ERROR_FAILED,
861 "Printing message bus address: did not write all bytes\n");
863 _dbus_string_free (&addr);
867 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
868 _dbus_pipe_close (print_addr_pipe, NULL);
870 _dbus_string_free (&addr);
873 context->connections = bus_connections_new (context);
874 if (context->connections == NULL)
880 context->matchmaker = bus_matchmaker_new ();
881 if (context->matchmaker == NULL)
887 /* check user before we fork */
888 if (context->user != NULL)
890 if (!_dbus_verify_daemon_user (context->user))
892 dbus_set_error (error, DBUS_ERROR_FAILED,
893 "Could not get UID and GID for username \"%s\"",
899 /* Now become a daemon if appropriate and write out pid file in any case */
903 if (context->pidfile)
904 _dbus_string_init_const (&u, context->pidfile);
906 if (((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 && context->fork) ||
907 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS))
909 _dbus_verbose ("Forking and becoming daemon\n");
911 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
914 context->keep_umask))
916 _DBUS_ASSERT_ERROR_IS_SET (error);
922 _dbus_verbose ("Fork not requested\n");
924 /* Need to write PID file and to PID pipe for ourselves,
925 * not for the child process. This is a no-op if the pidfile
926 * is NULL and print_pid_pipe is NULL.
928 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
933 _DBUS_ASSERT_ERROR_IS_SET (error);
939 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
940 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
941 _dbus_pipe_close (print_pid_pipe, NULL);
943 /* Raise the file descriptor limits before dropping the privileges
946 raise_file_descriptor_limit (context);
948 /* Here we change our credentials if required,
949 * as soon as we've set up our sockets and pidfile.
950 * This must be done before initializing LSMs, so that the netlink
951 * monitoring thread started by avc_init() will not lose CAP_AUDIT_WRITE
952 * when the main thread calls setuid().
953 * https://bugs.freedesktop.org/show_bug.cgi?id=92832
955 if (context->user != NULL)
957 if (!_dbus_change_to_daemon_user (context->user, error))
959 _DBUS_ASSERT_ERROR_IS_SET (error);
964 /* Auditing should be initialized before LSMs, so that the LSMs are able
965 * to log audit-events that happen during their initialization.
967 bus_audit_init (context);
969 if (!bus_selinux_full_init ())
971 bus_context_log (context, DBUS_SYSTEM_LOG_ERROR,
972 "SELinux enabled but D-Bus initialization failed; "
977 if (!bus_apparmor_full_init (error))
979 _DBUS_ASSERT_ERROR_IS_SET (error);
983 if (bus_apparmor_enabled ())
985 /* Only print AppArmor mediation message when syslog support is enabled */
987 bus_context_log (context, DBUS_SYSTEM_LOG_INFO,
988 "AppArmor D-Bus mediation is enabled\n");
991 /* When SELinux is used, this must happen after bus_selinux_full_init()
992 * so that it has access to the access vector cache, which is required
993 * to process <associate/> elements.
994 * http://lists.freedesktop.org/archives/dbus/2008-October/010491.html
996 if (!process_config_postinit (context, parser, error))
998 _DBUS_ASSERT_ERROR_IS_SET (error);
1004 bus_config_parser_unref (parser);
1008 context->check = bus_check_new(context, error);
1009 if (context->check == NULL)
1012 dbus_server_free_data_slot (&server_data_slot);
1018 bus_config_parser_unref (parser);
1019 if (context != NULL)
1020 bus_context_unref (context);
1022 if (server_data_slot >= 0)
1023 dbus_server_free_data_slot (&server_data_slot);
1029 bus_context_get_id (BusContext *context,
1032 return _dbus_uuid_encode (&context->uuid, uuid);
1036 bus_context_reload_config (BusContext *context,
1039 BusConfigParser *parser;
1040 DBusString config_file;
1043 /* Flush the user database cache */
1044 _dbus_flush_caches ();
1047 _dbus_string_init_const (&config_file, context->config_file);
1048 parser = bus_config_load (&config_file, TRUE, NULL, error);
1051 _DBUS_ASSERT_ERROR_IS_SET (error);
1055 if (!process_config_every_time (context, parser, TRUE, error))
1057 _DBUS_ASSERT_ERROR_IS_SET (error);
1060 if (!process_config_postinit (context, parser, error))
1062 _DBUS_ASSERT_ERROR_IS_SET (error);
1067 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
1070 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
1072 bus_config_parser_unref (parser);
1077 shutdown_server (BusContext *context,
1080 if (server == NULL ||
1081 !dbus_server_get_is_connected (server))
1084 if (!dbus_server_set_watch_functions (server,
1088 _dbus_assert_not_reached ("setting watch functions to NULL failed");
1090 if (!dbus_server_set_timeout_functions (server,
1094 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
1096 dbus_server_disconnect (server);
1100 bus_context_shutdown (BusContext *context)
1104 link = _dbus_list_get_first_link (&context->servers);
1105 while (link != NULL)
1107 shutdown_server (context, link->data);
1109 link = _dbus_list_get_next_link (&context->servers, link);
1114 bus_context_ref (BusContext *context)
1116 _dbus_assert (context->refcount > 0);
1117 context->refcount += 1;
1123 bus_context_unref (BusContext *context)
1125 _dbus_assert (context->refcount > 0);
1126 context->refcount -= 1;
1128 if (context->refcount == 0)
1132 _dbus_verbose ("Finalizing bus context %p\n", context);
1134 bus_context_shutdown (context);
1138 bus_check_unref(context->check);
1139 context->check = NULL;
1142 if (context->connections)
1144 bus_connections_unref (context->connections);
1145 context->connections = NULL;
1148 if (context->registry)
1150 bus_registry_unref (context->registry);
1151 context->registry = NULL;
1154 if (context->activation)
1156 bus_activation_unref (context->activation);
1157 context->activation = NULL;
1160 link = _dbus_list_get_first_link (&context->servers);
1161 while (link != NULL)
1163 dbus_server_unref (link->data);
1165 link = _dbus_list_get_next_link (&context->servers, link);
1167 _dbus_list_clear (&context->servers);
1169 if (context->policy)
1171 bus_policy_unref (context->policy);
1172 context->policy = NULL;
1177 _dbus_loop_unref (context->loop);
1178 context->loop = NULL;
1181 if (context->matchmaker)
1183 bus_matchmaker_unref (context->matchmaker);
1184 context->matchmaker = NULL;
1187 dbus_free (context->config_file);
1188 dbus_free (context->log_prefix);
1189 dbus_free (context->type);
1190 dbus_free (context->address);
1191 dbus_free (context->user);
1192 dbus_free (context->servicehelper);
1194 if (context->pidfile)
1197 _dbus_string_init_const (&u, context->pidfile);
1199 /* Deliberately ignore errors here, since there's not much
1200 * we can do about it, and we're exiting anyways.
1202 _dbus_delete_file (&u, NULL);
1204 dbus_free (context->pidfile);
1207 if (context->initial_fd_limit)
1208 _dbus_rlimit_free (context->initial_fd_limit);
1210 dbus_free (context);
1212 dbus_server_free_data_slot (&server_data_slot);
1216 /* type may be NULL */
1218 bus_context_get_type (BusContext *context)
1220 return context->type;
1224 bus_context_get_address (BusContext *context)
1226 return context->address;
1230 bus_context_get_servicehelper (BusContext *context)
1232 return context->servicehelper;
1236 bus_context_get_systemd_activation (BusContext *context)
1238 return context->systemd_activation;
1242 bus_context_get_registry (BusContext *context)
1244 return context->registry;
1248 bus_context_get_connections (BusContext *context)
1250 return context->connections;
1254 bus_context_get_activation (BusContext *context)
1256 return context->activation;
1260 bus_context_get_matchmaker (BusContext *context)
1262 return context->matchmaker;
1266 bus_context_get_loop (BusContext *context)
1268 return context->loop;
1272 bus_context_get_check (BusContext *context)
1274 return context->check;
1278 bus_context_allow_unix_user (BusContext *context,
1281 return bus_policy_allow_unix_user (context->policy,
1285 /* For now this is never actually called because the default
1286 * DBusConnection behavior of 'same user that owns the bus can connect'
1287 * is all it would do.
1290 bus_context_allow_windows_user (BusContext *context,
1291 const char *windows_sid)
1293 return bus_policy_allow_windows_user (context->policy,
1298 bus_context_get_policy (BusContext *context)
1300 return context->policy;
1304 bus_context_create_client_policy (BusContext *context,
1305 DBusConnection *connection,
1308 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1309 return bus_policy_create_client_policy (context->policy, connection,
1314 bus_context_get_activation_timeout (BusContext *context)
1317 return context->limits.activation_timeout;
1321 bus_context_get_auth_timeout (BusContext *context)
1323 return context->limits.auth_timeout;
1327 bus_context_get_pending_fd_timeout (BusContext *context)
1329 return context->limits.pending_fd_timeout;
1333 bus_context_get_max_completed_connections (BusContext *context)
1335 return context->limits.max_completed_connections;
1339 bus_context_get_max_incomplete_connections (BusContext *context)
1341 return context->limits.max_incomplete_connections;
1345 bus_context_get_max_connections_per_user (BusContext *context)
1347 return context->limits.max_connections_per_user;
1351 bus_context_get_max_pending_activations (BusContext *context)
1353 return context->limits.max_pending_activations;
1357 bus_context_get_max_services_per_connection (BusContext *context)
1359 return context->limits.max_services_per_connection;
1363 bus_context_get_max_match_rules_per_connection (BusContext *context)
1365 return context->limits.max_match_rules_per_connection;
1369 bus_context_get_max_replies_per_connection (BusContext *context)
1371 return context->limits.max_replies_per_connection;
1375 bus_context_get_reply_timeout (BusContext *context)
1377 return context->limits.reply_timeout;
1381 bus_context_get_initial_fd_limit (BusContext *context)
1383 return context->initial_fd_limit;
1387 bus_context_get_using_syslog (BusContext *context)
1389 return context->syslog;
1393 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1397 va_start (args, msg);
1399 if (context->log_prefix)
1401 DBusString full_msg;
1403 if (!_dbus_string_init (&full_msg))
1405 if (!_dbus_string_append (&full_msg, context->log_prefix))
1407 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1410 _dbus_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1412 _dbus_string_free (&full_msg);
1415 _dbus_logv (severity, msg, args);
1421 static inline const char *
1422 nonnull (const char *maybe_null,
1423 const char *if_null)
1425 return (maybe_null ? maybe_null : if_null);
1429 bus_context_log_literal (BusContext *context,
1430 DBusSystemLogSeverity severity,
1433 _dbus_log (severity, "%s%s", nonnull (context->log_prefix, ""), msg);
1437 bus_context_log_and_set_error (BusContext *context,
1438 DBusSystemLogSeverity severity,
1444 DBusError stack_error = DBUS_ERROR_INIT;
1447 va_start (args, msg);
1448 _dbus_set_error_valist (&stack_error, name, msg, args);
1451 /* If we hit OOM while setting the error, this will syslog "out of memory"
1452 * which is itself an indication that something is seriously wrong */
1453 bus_context_log_literal (context, DBUS_SYSTEM_LOG_SECURITY,
1454 stack_error.message);
1456 dbus_move_error (&stack_error, error);
1460 * Log something about a message, usually that it was rejected.
1463 complain_about_message (BusContext *context,
1464 const char *error_name,
1465 const char *complaint,
1467 DBusMessage *message,
1468 DBusConnection *sender,
1469 DBusConnection *proposed_recipient,
1470 dbus_bool_t requested_reply,
1472 const char *privilege,
1476 DBusError stack_error = DBUS_ERROR_INIT;
1477 const char *sender_name;
1478 const char *sender_loginfo;
1479 const char *proposed_recipient_loginfo;
1481 if (error == NULL && !log)
1486 sender_name = bus_connection_get_name (sender);
1487 sender_loginfo = bus_connection_get_loginfo (sender);
1491 sender_name = "(unset)";
1492 sender_loginfo = "(bus)";
1495 if (proposed_recipient != NULL)
1496 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1498 proposed_recipient_loginfo = "bus";
1500 dbus_set_error (&stack_error, error_name,
1501 "%s, %d matched rules; type=\"%s\", sender=\"%s\" (%s) "
1502 "interface=\"%s\" member=\"%s\" error name=\"%s\" "
1503 "requested_reply=\"%d\" destination=\"%s\" "
1504 "privilege=\"%s\" (%s) "
1508 dbus_message_type_to_string (dbus_message_get_type (message)),
1511 nonnull (dbus_message_get_interface (message), "(unset)"),
1512 nonnull (dbus_message_get_member (message), "(unset)"),
1513 nonnull (dbus_message_get_error_name (message), "(unset)"),
1515 nonnull (dbus_message_get_destination (message), DBUS_SERVICE_DBUS),
1516 nonnull (privilege, "(n/a)"),
1517 proposed_recipient_loginfo,
1520 /* If we hit OOM while setting the error, this will syslog "out of memory"
1521 * which is itself an indication that something is seriously wrong */
1523 bus_context_log_literal (context, DBUS_SYSTEM_LOG_SECURITY,
1524 stack_error.message);
1526 dbus_move_error (&stack_error, error);
1530 * addressed_recipient is the recipient specified in the message.
1532 * proposed_recipient is the recipient we're considering sending
1533 * to right this second, and may be an eavesdropper.
1535 * sender is the sender of the message.
1537 * NULL for sender definitely means the bus driver.
1539 * NULL for proposed_recipient may mean the bus driver, or may mean
1540 * we are checking whether service-activation is allowed as a first
1541 * pass before all details of the activated service are known.
1543 * NULL for addressed_recipient may mean the bus driver, or may mean
1544 * no destination was specified in the message (e.g. a signal).
1547 bus_context_check_security_policy (BusContext *context,
1548 BusTransaction *transaction,
1549 DBusConnection *sender,
1550 DBusConnection *addressed_recipient,
1551 DBusConnection *proposed_recipient,
1552 DBusMessage *message,
1553 BusActivationEntry *activation_entry,
1555 BusDeferredMessage **deferred_message)
1557 const char *src, *dest;
1558 BusClientPolicy *sender_policy;
1559 BusClientPolicy *recipient_policy;
1560 dbus_int32_t toggles;
1563 dbus_bool_t requested_reply;
1564 const char *privilege;
1565 char *out_rule = NULL;
1566 BusResult can_send_result = BUS_RESULT_TRUE;
1568 type = dbus_message_get_type (message);
1569 src = dbus_message_get_sender (message);
1570 dest = dbus_message_get_destination (message);
1572 /* dispatch.c was supposed to ensure these invariants */
1573 _dbus_assert (dest != NULL ||
1574 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1575 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1576 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1577 addressed_recipient != NULL ||
1578 activation_entry != NULL ||
1579 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1583 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1584 case DBUS_MESSAGE_TYPE_SIGNAL:
1585 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1586 case DBUS_MESSAGE_TYPE_ERROR:
1590 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1593 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1594 "Message bus will not accept messages of unknown type\n");
1596 return BUS_RESULT_FALSE;
1599 requested_reply = FALSE;
1603 if (bus_connection_is_active (sender))
1605 sender_policy = bus_connection_get_policy (sender);
1606 _dbus_assert (sender_policy != NULL);
1608 /* Fill in requested_reply variable with TRUE if this is a
1609 * reply and the reply was pending.
1611 if (dbus_message_get_reply_serial (message) != 0)
1613 if (proposed_recipient != NULL /* not to the bus driver */ &&
1614 addressed_recipient == proposed_recipient /* not eavesdropping */)
1618 dbus_error_init (&error2);
1619 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1621 sender, addressed_recipient, message,
1623 if (dbus_error_is_set (&error2))
1625 dbus_move_error (&error2, error);
1626 return BUS_RESULT_FALSE;
1633 sender_policy = NULL;
1636 /* First verify the SELinux access controls. If allowed then
1637 * go on with the standard checks.
1639 if (!bus_selinux_allows_send (sender, proposed_recipient,
1640 dbus_message_type_to_string (dbus_message_get_type (message)),
1641 dbus_message_get_interface (message),
1642 dbus_message_get_member (message),
1643 dbus_message_get_error_name (message),
1644 dest ? dest : DBUS_SERVICE_DBUS,
1648 if (error != NULL && !dbus_error_is_set (error))
1650 /* don't syslog this, just set the error: avc_has_perm should
1651 * have already written to either the audit log or syslog */
1652 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1653 "An SELinux policy prevents this sender from sending this "
1654 "message to this recipient",
1655 0, message, sender, proposed_recipient, FALSE, FALSE, NULL, error, NULL);
1656 _dbus_verbose ("SELinux security check denying send to service\n");
1659 return BUS_RESULT_FALSE;
1662 /* next verify AppArmor access controls. If allowed then
1663 * go on with the standard checks.
1665 if (!bus_apparmor_allows_send (sender, proposed_recipient,
1667 bus_context_get_type (context),
1668 dbus_message_get_type (message),
1669 dbus_message_get_path (message),
1670 dbus_message_get_interface (message),
1671 dbus_message_get_member (message),
1672 dbus_message_get_error_name (message),
1673 dest ? dest : DBUS_SERVICE_DBUS,
1674 src ? src : DBUS_SERVICE_DBUS,
1677 return BUS_RESULT_FALSE;
1679 if (!bus_connection_is_active (sender))
1681 /* Policy for inactive connections is that they can only send
1682 * the hello message to the bus driver
1684 if (proposed_recipient == NULL &&
1685 dbus_message_is_method_call (message,
1686 DBUS_INTERFACE_DBUS,
1689 _dbus_verbose ("security check allowing %s message\n",
1691 return BUS_RESULT_TRUE;
1695 _dbus_verbose ("security check disallowing non-%s message\n",
1698 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1699 "Client tried to send a message other than %s without being registered",
1702 return BUS_RESULT_FALSE;
1708 sender_policy = NULL;
1710 /* If the sender is the bus driver, we assume any reply was a
1711 * requested reply as bus driver won't send bogus ones
1713 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1714 dbus_message_get_reply_serial (message) != 0)
1715 requested_reply = TRUE;
1718 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1719 (sender == NULL && sender_policy == NULL));
1721 if (proposed_recipient != NULL)
1723 /* only the bus driver can send to an inactive recipient (as it
1724 * owns no services, so other apps can't address it). Inactive
1725 * recipients can receive any message.
1727 if (bus_connection_is_active (proposed_recipient))
1729 recipient_policy = bus_connection_get_policy (proposed_recipient);
1730 _dbus_assert (recipient_policy != NULL);
1732 else if (sender == NULL)
1734 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1735 recipient_policy = NULL;
1739 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus");
1740 recipient_policy = NULL;
1744 recipient_policy = NULL;
1746 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1747 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1748 (proposed_recipient == NULL && recipient_policy == NULL));
1751 if (sender_policy) {
1752 can_send_result = bus_client_policy_check_can_send (sender,
1756 addressed_recipient,
1758 message, &toggles, &log, &privilege,
1759 deferred_message, &out_rule);
1760 if (can_send_result == BUS_RESULT_FALSE)
1762 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1763 "Rejected send message", toggles,
1764 message, sender, proposed_recipient, requested_reply,
1765 (addressed_recipient == proposed_recipient) || (type == DBUS_MESSAGE_TYPE_SIGNAL),
1768 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1771 return BUS_RESULT_FALSE;
1777 /* We want to drop this message, and are only not doing so for backwards
1779 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1780 "Would reject message", toggles,
1781 message, sender, proposed_recipient, requested_reply,
1782 TRUE, privilege, NULL, NULL);
1785 if (recipient_policy) {
1786 switch (bus_client_policy_check_can_receive (recipient_policy,
1790 addressed_recipient, proposed_recipient,
1791 message, &toggles, &privilege, deferred_message, &out_rule))
1793 case BUS_RESULT_TRUE:
1795 case BUS_RESULT_FALSE:
1796 complain_about_message(context, DBUS_ERROR_ACCESS_DENIED,
1797 "Rejected receive message", toggles, message, sender,
1798 proposed_recipient, requested_reply,
1799 (addressed_recipient == proposed_recipient) || (type == DBUS_MESSAGE_TYPE_SIGNAL),
1800 privilege, error, out_rule);
1802 "security policy disallowing message due to recipient policy\n");
1805 if (deferred_message && *deferred_message)
1806 bus_deferred_message_set_response (*deferred_message, BUS_RESULT_FALSE);
1807 return BUS_RESULT_FALSE;
1808 case BUS_RESULT_LATER:
1809 return BUS_RESULT_LATER;
1813 if (can_send_result == BUS_RESULT_LATER)
1814 return BUS_RESULT_LATER;
1816 /* See if limits on size have been exceeded */
1817 if (!bus_context_check_recipient_message_limits(context, proposed_recipient, sender, message,
1818 requested_reply, error))
1819 return BUS_RESULT_FALSE;
1821 /* Record that we will allow a reply here in the future (don't
1822 * bother if the recipient is the bus or this is an eavesdropping
1823 * connection). Only the addressed recipient may reply.
1825 * This isn't done for activation attempts because they have no addressed
1826 * or proposed recipient; when we check whether to actually deliver the
1827 * message, later, we'll record the reply expectation at that point.
1829 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1831 addressed_recipient &&
1832 addressed_recipient == proposed_recipient && /* not eavesdropping */
1833 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1835 sender, addressed_recipient,
1838 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1839 return BUS_RESULT_FALSE;
1842 _dbus_verbose ("security policy allowing message\n");
1843 return BUS_RESULT_TRUE;
1847 bus_context_check_all_watches (BusContext *context)
1850 dbus_bool_t enabled = TRUE;
1852 if (bus_connections_get_n_incomplete (context->connections) >=
1853 bus_context_get_max_incomplete_connections (context))
1858 if (context->watches_enabled == enabled)
1861 context->watches_enabled = enabled;
1863 for (link = _dbus_list_get_first_link (&context->servers);
1865 link = _dbus_list_get_next_link (&context->servers, link))
1867 /* A BusContext might contains several DBusServer (if there are
1868 * several <listen> configuration items) and a DBusServer might
1869 * contain several DBusWatch in its DBusWatchList (if getaddrinfo
1870 * returns several addresses on a dual IPv4-IPv6 stack or if
1871 * systemd passes several fds).
1872 * We want to enable/disable them all.
1874 DBusServer *server = link->data;
1875 _dbus_server_toggle_all_watches (server, enabled);
1880 bus_context_complain_about_message (BusContext *context,
1881 const char *error_name,
1882 const char *complaint,
1884 DBusMessage *message,
1885 DBusConnection *sender,
1886 DBusConnection *proposed_recipient,
1887 dbus_bool_t requested_reply,
1889 const char *privilege,
1892 complain_about_message(context, error_name, complaint, matched_rules, message, sender,
1893 proposed_recipient, requested_reply, log, privilege, error, NULL);
1896 dbus_bool_t bus_context_check_recipient_message_limits (BusContext *context,
1897 DBusConnection *recipient,
1898 DBusConnection *sender,
1899 DBusMessage *message,
1900 dbus_bool_t requested_reply,
1905 ((dbus_connection_get_outgoing_size (recipient) > context->limits.max_outgoing_bytes) ||
1906 (dbus_connection_get_outgoing_unix_fds (recipient) > context->limits.max_outgoing_unix_fds)))
1908 complain_about_message (context, DBUS_ERROR_LIMITS_EXCEEDED,
1909 "Rejected: destination has a full message queue",
1910 0, message, sender, recipient, requested_reply, TRUE, NULL,
1912 _dbus_verbose ("security policy disallowing message due to full message queue\n");