1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* bus.c message bus context object
4 * Copyright (C) 2003, 2004 Red Hat, Inc.
6 * Licensed under the Academic Free License version 2.1
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #include "activation.h"
30 #include "connection.h"
34 #include "config-parser.h"
37 #include "dir-watch.h"
38 #include <dbus/dbus-list.h>
39 #include <dbus/dbus-hash.h>
40 #include <dbus/dbus-credentials.h>
41 #include <dbus/dbus-internals.h>
60 BusConnections *connections;
61 BusActivation *activation;
62 BusRegistry *registry;
64 BusMatchmaker *matchmaker;
66 unsigned int fork : 1;
67 unsigned int syslog : 1;
68 unsigned int keep_umask : 1;
69 unsigned int allow_anonymous : 1;
70 unsigned int systemd_activation : 1;
73 static dbus_int32_t server_data_slot = -1;
80 #define BUS_SERVER_DATA(server) (dbus_server_get_data ((server), server_data_slot))
83 server_get_context (DBusServer *server)
88 if (!dbus_server_allocate_data_slot (&server_data_slot))
91 bd = BUS_SERVER_DATA (server);
94 dbus_server_free_data_slot (&server_data_slot);
98 context = bd->context;
100 dbus_server_free_data_slot (&server_data_slot);
106 add_server_watch (DBusWatch *watch,
109 DBusServer *server = data;
112 context = server_get_context (server);
114 return _dbus_loop_add_watch (context->loop, watch);
118 remove_server_watch (DBusWatch *watch,
121 DBusServer *server = data;
124 context = server_get_context (server);
126 _dbus_loop_remove_watch (context->loop, watch);
130 toggle_server_watch (DBusWatch *watch,
133 DBusServer *server = data;
136 context = server_get_context (server);
138 _dbus_loop_toggle_watch (context->loop, watch);
142 add_server_timeout (DBusTimeout *timeout,
145 DBusServer *server = data;
148 context = server_get_context (server);
150 return _dbus_loop_add_timeout (context->loop, timeout);
154 remove_server_timeout (DBusTimeout *timeout,
157 DBusServer *server = data;
160 context = server_get_context (server);
162 _dbus_loop_remove_timeout (context->loop, timeout);
166 new_connection_callback (DBusServer *server,
167 DBusConnection *new_connection,
170 BusContext *context = data;
172 if (!bus_connections_setup_connection (context->connections, new_connection))
174 _dbus_verbose ("No memory to setup new connection\n");
176 /* if we don't do this, it will get unref'd without
177 * being disconnected... kind of strange really
178 * that we have to do this, people won't get it right
181 dbus_connection_close (new_connection);
184 dbus_connection_set_max_received_size (new_connection,
185 context->limits.max_incoming_bytes);
187 dbus_connection_set_max_message_size (new_connection,
188 context->limits.max_message_size);
190 dbus_connection_set_max_received_unix_fds (new_connection,
191 context->limits.max_incoming_unix_fds);
193 dbus_connection_set_max_message_unix_fds (new_connection,
194 context->limits.max_message_unix_fds);
196 dbus_connection_set_allow_anonymous (new_connection,
197 context->allow_anonymous);
199 /* on OOM, we won't have ref'd the connection so it will die. */
203 free_server_data (void *data)
205 BusServerData *bd = data;
211 setup_server (BusContext *context,
213 char **auth_mechanisms,
218 bd = dbus_new0 (BusServerData, 1);
219 if (bd == NULL || !dbus_server_set_data (server,
221 bd, free_server_data))
228 bd->context = context;
230 if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms))
236 dbus_server_set_new_connection_function (server,
237 new_connection_callback,
240 if (!dbus_server_set_watch_functions (server,
251 if (!dbus_server_set_timeout_functions (server,
253 remove_server_timeout,
264 /* This code only gets executed the first time the
265 * config files are parsed. It is not executed
266 * when config files are reloaded.
269 process_config_first_time_only (BusContext *context,
270 BusConfigParser *parser,
271 const DBusString *address,
272 BusContextFlags flags,
275 DBusString log_prefix;
277 DBusList **addresses;
278 const char *user, *pidfile;
279 char **auth_mechanisms;
280 DBusList **auth_mechanisms_list;
284 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
287 auth_mechanisms = NULL;
290 _dbus_init_system_log ();
292 if (flags & BUS_CONTEXT_FLAG_SYSTEMD_ACTIVATION)
293 context->systemd_activation = TRUE;
295 context->systemd_activation = FALSE;
297 /* Check for an existing pid file. Of course this is a race;
298 * we'd have to use fcntl() locks on the pid file to
299 * avoid that. But we want to check for the pid file
300 * before overwriting any existing sockets, etc.
303 if (flags & BUS_CONTEXT_FLAG_WRITE_PID_FILE)
304 pidfile = bus_config_parser_get_pidfile (parser);
311 _dbus_string_init_const (&u, pidfile);
313 if (_dbus_stat (&u, &stbuf, NULL))
319 _dbus_string_init (&p);
320 _dbus_file_get_contents(&p, &u, NULL);
321 _dbus_string_parse_int(&p, 0, &pid, NULL);
322 _dbus_string_free(&p);
324 if ((kill((int)pid, 0))) {
325 dbus_set_error(NULL, DBUS_ERROR_FILE_EXISTS,
326 "pid %ld not running, removing stale pid file\n",
328 _dbus_delete_file(&u, NULL);
331 dbus_set_error (error, DBUS_ERROR_FAILED,
332 "The pid file \"%s\" exists, if the message bus is not running, remove this file",
341 /* keep around the pid filename so we can delete it later */
342 context->pidfile = _dbus_strdup (pidfile);
344 /* note that type may be NULL */
345 context->type = _dbus_strdup (bus_config_parser_get_type (parser));
346 if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
349 user = bus_config_parser_get_user (parser);
352 context->user = _dbus_strdup (user);
353 if (context->user == NULL)
357 /* Set up the prefix for syslog messages */
358 if (!_dbus_string_init (&log_prefix))
360 if (context->type && !strcmp (context->type, "system"))
362 if (!_dbus_string_append (&log_prefix, "[system] "))
365 else if (context->type && !strcmp (context->type, "session"))
367 DBusCredentials *credentials;
369 credentials = _dbus_credentials_new_from_current_process ();
372 if (!_dbus_string_append (&log_prefix, "[session "))
374 _dbus_credentials_unref (credentials);
377 if (!_dbus_credentials_to_string_append (credentials, &log_prefix))
379 _dbus_credentials_unref (credentials);
382 if (!_dbus_string_append (&log_prefix, "] "))
384 _dbus_credentials_unref (credentials);
387 _dbus_credentials_unref (credentials);
389 if (!_dbus_string_steal_data (&log_prefix, &context->log_prefix))
391 _dbus_string_free (&log_prefix);
393 /* Build an array of auth mechanisms */
395 auth_mechanisms_list = bus_config_parser_get_mechanisms (parser);
396 len = _dbus_list_get_length (auth_mechanisms_list);
402 auth_mechanisms = dbus_new0 (char*, len + 1);
403 if (auth_mechanisms == NULL)
407 link = _dbus_list_get_first_link (auth_mechanisms_list);
410 auth_mechanisms[i] = _dbus_strdup (link->data);
411 if (auth_mechanisms[i] == NULL)
413 link = _dbus_list_get_next_link (auth_mechanisms_list, link);
419 auth_mechanisms = NULL;
422 /* Listen on our addresses */
428 server = dbus_server_listen (_dbus_string_get_const_data(address), error);
431 _DBUS_ASSERT_ERROR_IS_SET (error);
434 else if (!setup_server (context, server, auth_mechanisms, error))
436 _DBUS_ASSERT_ERROR_IS_SET (error);
440 if (!_dbus_list_append (&context->servers, server))
445 addresses = bus_config_parser_get_addresses (parser);
447 link = _dbus_list_get_first_link (addresses);
452 server = dbus_server_listen (link->data, error);
455 _DBUS_ASSERT_ERROR_IS_SET (error);
458 else if (!setup_server (context, server, auth_mechanisms, error))
460 _DBUS_ASSERT_ERROR_IS_SET (error);
464 if (!_dbus_list_append (&context->servers, server))
467 link = _dbus_list_get_next_link (addresses, link);
471 context->fork = bus_config_parser_get_fork (parser);
472 context->syslog = bus_config_parser_get_syslog (parser);
473 context->keep_umask = bus_config_parser_get_keep_umask (parser);
474 context->allow_anonymous = bus_config_parser_get_allow_anonymous (parser);
476 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
480 dbus_free_string_array (auth_mechanisms);
485 dbus_free_string_array (auth_mechanisms);
489 /* This code gets executed every time the config files
490 * are parsed: both during BusContext construction
491 * and on reloads. This function is slightly screwy
492 * since it can do a "half reload" in out-of-memory
493 * situations. Realistically, unlikely to ever matter.
496 process_config_every_time (BusContext *context,
497 BusConfigParser *parser,
498 dbus_bool_t is_reload,
501 DBusString full_address;
505 const char *servicehelper;
510 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
515 if (!_dbus_string_init (&full_address))
521 /* get our limits and timeout lengths */
522 bus_config_parser_get_limits (parser, &context->limits);
525 bus_policy_unref (context->policy);
526 context->policy = bus_config_parser_steal_policy (parser);
527 _dbus_assert (context->policy != NULL);
529 /* We have to build the address backward, so that
530 * <listen> later in the config file have priority
532 link = _dbus_list_get_last_link (&context->servers);
535 addr = dbus_server_get_address (link->data);
542 if (_dbus_string_get_length (&full_address) > 0)
544 if (!_dbus_string_append (&full_address, ";"))
551 if (!_dbus_string_append (&full_address, addr))
560 link = _dbus_list_get_prev_link (&context->servers, link);
564 dbus_free (context->address);
566 if (!_dbus_string_copy_data (&full_address, &context->address))
572 /* get the service directories */
573 dirs = bus_config_parser_get_service_dirs (parser);
575 /* and the service helper */
576 servicehelper = bus_config_parser_get_servicehelper (parser);
578 s = _dbus_strdup(servicehelper);
579 if (s == NULL && servicehelper != NULL)
586 dbus_free(context->servicehelper);
587 context->servicehelper = s;
590 /* Create activation subsystem */
591 if (context->activation)
593 if (!bus_activation_reload (context->activation, &full_address, dirs, error))
598 context->activation = bus_activation_new (context, &full_address, dirs, error);
601 if (context->activation == NULL)
603 _DBUS_ASSERT_ERROR_IS_SET (error);
607 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
611 _dbus_string_free (&full_address);
620 list_concat_new (DBusList **a,
628 for (link = _dbus_list_get_first_link (a); link; link = _dbus_list_get_next_link (a, link))
630 if (!_dbus_list_append (result, link->data))
633 for (link = _dbus_list_get_first_link (b); link; link = _dbus_list_get_next_link (b, link))
635 if (!_dbus_list_append (result, link->data))
641 _dbus_list_clear (result);
646 raise_file_descriptor_limit (BusContext *context)
649 /* I just picked this out of thin air; we need some extra
650 * descriptors for things like any internal pipes we create,
651 * inotify, connections to SELinux, etc.
653 unsigned int arbitrary_extra_fds = 32;
656 limit = context->limits.max_completed_connections +
657 context->limits.max_incomplete_connections
658 + arbitrary_extra_fds;
660 _dbus_request_file_descriptor_limit (limit);
664 process_config_postinit (BusContext *context,
665 BusConfigParser *parser,
668 DBusHashTable *service_context_table;
669 DBusList *watched_dirs = NULL;
671 raise_file_descriptor_limit (context);
673 service_context_table = bus_config_parser_steal_service_context_table (parser);
674 if (!bus_registry_set_service_context_table (context->registry,
675 service_context_table))
681 _dbus_hash_table_unref (service_context_table);
683 /* We need to monitor both the configuration directories and directories
684 * containing .service files.
686 if (!list_concat_new (bus_config_parser_get_conf_dirs (parser),
687 bus_config_parser_get_service_dirs (parser),
694 bus_set_watched_dirs (context, &watched_dirs);
696 _dbus_list_clear (&watched_dirs);
702 bus_context_new (const DBusString *config_file,
703 BusContextFlags flags,
704 DBusPipe *print_addr_pipe,
705 DBusPipe *print_pid_pipe,
706 const DBusString *address,
710 BusConfigParser *parser;
712 _dbus_assert ((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 ||
713 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS) == 0);
715 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
720 if (!dbus_server_allocate_data_slot (&server_data_slot))
726 context = dbus_new0 (BusContext, 1);
732 context->refcount = 1;
734 _dbus_generate_uuid (&context->uuid);
736 if (!_dbus_string_copy_data (config_file, &context->config_file))
742 context->loop = _dbus_loop_new ();
743 if (context->loop == NULL)
749 context->registry = bus_registry_new (context);
750 if (context->registry == NULL)
756 parser = bus_config_load (config_file, TRUE, NULL, error);
759 _DBUS_ASSERT_ERROR_IS_SET (error);
763 if (!process_config_first_time_only (context, parser, address, flags, error))
765 _DBUS_ASSERT_ERROR_IS_SET (error);
768 if (!process_config_every_time (context, parser, FALSE, error))
770 _DBUS_ASSERT_ERROR_IS_SET (error);
774 /* we need another ref of the server data slot for the context
777 if (!dbus_server_allocate_data_slot (&server_data_slot))
778 _dbus_assert_not_reached ("second ref of server data slot failed");
780 /* Note that we don't know whether the print_addr_pipe is
781 * one of the sockets we're using to listen on, or some
782 * other random thing. But I think the answer is "don't do
785 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
788 const char *a = bus_context_get_address (context);
791 _dbus_assert (a != NULL);
792 if (!_dbus_string_init (&addr))
798 if (!_dbus_string_append (&addr, a) ||
799 !_dbus_string_append (&addr, "\n"))
801 _dbus_string_free (&addr);
806 bytes = _dbus_string_get_length (&addr);
807 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
809 /* pipe write returns an error on failure but not short write */
810 if (error != NULL && !dbus_error_is_set (error))
812 dbus_set_error (error, DBUS_ERROR_FAILED,
813 "Printing message bus address: did not write all bytes\n");
815 _dbus_string_free (&addr);
819 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
820 _dbus_pipe_close (print_addr_pipe, NULL);
822 _dbus_string_free (&addr);
825 context->connections = bus_connections_new (context);
826 if (context->connections == NULL)
832 context->matchmaker = bus_matchmaker_new ();
833 if (context->matchmaker == NULL)
839 /* check user before we fork */
840 if (context->user != NULL)
842 if (!_dbus_verify_daemon_user (context->user))
844 dbus_set_error (error, DBUS_ERROR_FAILED,
845 "Could not get UID and GID for username \"%s\"",
851 /* Now become a daemon if appropriate and write out pid file in any case */
855 if (context->pidfile)
856 _dbus_string_init_const (&u, context->pidfile);
858 if (((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 && context->fork) ||
859 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS))
861 _dbus_verbose ("Forking and becoming daemon\n");
863 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
866 context->keep_umask))
868 _DBUS_ASSERT_ERROR_IS_SET (error);
874 _dbus_verbose ("Fork not requested\n");
876 /* Need to write PID file and to PID pipe for ourselves,
877 * not for the child process. This is a no-op if the pidfile
878 * is NULL and print_pid_pipe is NULL.
880 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
885 _DBUS_ASSERT_ERROR_IS_SET (error);
891 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
892 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
893 _dbus_pipe_close (print_pid_pipe, NULL);
895 if (!bus_selinux_full_init ())
897 bus_context_log (context, DBUS_SYSTEM_LOG_FATAL, "SELinux enabled but AVC initialization failed; check system log\n");
900 if (!process_config_postinit (context, parser, error))
902 _DBUS_ASSERT_ERROR_IS_SET (error);
908 bus_config_parser_unref (parser);
912 /* Here we change our credentials if required,
913 * as soon as we've set up our sockets and pidfile
915 if (context->user != NULL)
917 if (!_dbus_change_to_daemon_user (context->user, error))
919 _DBUS_ASSERT_ERROR_IS_SET (error);
924 /* FIXME - why not just put this in full_init() below? */
925 bus_selinux_audit_init ();
929 dbus_server_free_data_slot (&server_data_slot);
935 bus_config_parser_unref (parser);
937 bus_context_unref (context);
939 if (server_data_slot >= 0)
940 dbus_server_free_data_slot (&server_data_slot);
946 bus_context_get_id (BusContext *context,
949 return _dbus_uuid_encode (&context->uuid, uuid);
953 bus_context_reload_config (BusContext *context,
956 BusConfigParser *parser;
957 DBusString config_file;
960 /* Flush the user database cache */
961 _dbus_flush_caches ();
964 _dbus_string_init_const (&config_file, context->config_file);
965 parser = bus_config_load (&config_file, TRUE, NULL, error);
968 _DBUS_ASSERT_ERROR_IS_SET (error);
972 if (!process_config_every_time (context, parser, TRUE, error))
974 _DBUS_ASSERT_ERROR_IS_SET (error);
977 if (!process_config_postinit (context, parser, error))
979 _DBUS_ASSERT_ERROR_IS_SET (error);
984 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
987 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
989 bus_config_parser_unref (parser);
994 shutdown_server (BusContext *context,
997 if (server == NULL ||
998 !dbus_server_get_is_connected (server))
1001 if (!dbus_server_set_watch_functions (server,
1005 _dbus_assert_not_reached ("setting watch functions to NULL failed");
1007 if (!dbus_server_set_timeout_functions (server,
1011 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
1013 dbus_server_disconnect (server);
1017 bus_context_shutdown (BusContext *context)
1021 link = _dbus_list_get_first_link (&context->servers);
1022 while (link != NULL)
1024 shutdown_server (context, link->data);
1026 link = _dbus_list_get_next_link (&context->servers, link);
1031 bus_context_ref (BusContext *context)
1033 _dbus_assert (context->refcount > 0);
1034 context->refcount += 1;
1040 bus_context_unref (BusContext *context)
1042 _dbus_assert (context->refcount > 0);
1043 context->refcount -= 1;
1045 if (context->refcount == 0)
1049 _dbus_verbose ("Finalizing bus context %p\n", context);
1051 bus_context_shutdown (context);
1053 if (context->connections)
1055 bus_connections_unref (context->connections);
1056 context->connections = NULL;
1059 if (context->registry)
1061 bus_registry_unref (context->registry);
1062 context->registry = NULL;
1065 if (context->activation)
1067 bus_activation_unref (context->activation);
1068 context->activation = NULL;
1071 link = _dbus_list_get_first_link (&context->servers);
1072 while (link != NULL)
1074 dbus_server_unref (link->data);
1076 link = _dbus_list_get_next_link (&context->servers, link);
1078 _dbus_list_clear (&context->servers);
1080 if (context->policy)
1082 bus_policy_unref (context->policy);
1083 context->policy = NULL;
1088 _dbus_loop_unref (context->loop);
1089 context->loop = NULL;
1092 if (context->matchmaker)
1094 bus_matchmaker_unref (context->matchmaker);
1095 context->matchmaker = NULL;
1098 dbus_free (context->config_file);
1099 dbus_free (context->log_prefix);
1100 dbus_free (context->type);
1101 dbus_free (context->address);
1102 dbus_free (context->user);
1103 dbus_free (context->servicehelper);
1105 if (context->pidfile)
1108 _dbus_string_init_const (&u, context->pidfile);
1110 /* Deliberately ignore errors here, since there's not much
1111 * we can do about it, and we're exiting anyways.
1113 _dbus_delete_file (&u, NULL);
1115 dbus_free (context->pidfile);
1117 dbus_free (context);
1119 dbus_server_free_data_slot (&server_data_slot);
1123 /* type may be NULL */
1125 bus_context_get_type (BusContext *context)
1127 return context->type;
1131 bus_context_get_address (BusContext *context)
1133 return context->address;
1137 bus_context_get_servicehelper (BusContext *context)
1139 return context->servicehelper;
1143 bus_context_get_systemd_activation (BusContext *context)
1145 return context->systemd_activation;
1149 bus_context_get_registry (BusContext *context)
1151 return context->registry;
1155 bus_context_get_connections (BusContext *context)
1157 return context->connections;
1161 bus_context_get_activation (BusContext *context)
1163 return context->activation;
1167 bus_context_get_matchmaker (BusContext *context)
1169 return context->matchmaker;
1173 bus_context_get_loop (BusContext *context)
1175 return context->loop;
1179 bus_context_allow_unix_user (BusContext *context,
1182 return bus_policy_allow_unix_user (context->policy,
1186 /* For now this is never actually called because the default
1187 * DBusConnection behavior of 'same user that owns the bus can connect'
1188 * is all it would do.
1191 bus_context_allow_windows_user (BusContext *context,
1192 const char *windows_sid)
1194 return bus_policy_allow_windows_user (context->policy,
1199 bus_context_get_policy (BusContext *context)
1201 return context->policy;
1205 bus_context_create_client_policy (BusContext *context,
1206 DBusConnection *connection,
1209 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1210 return bus_policy_create_client_policy (context->policy, connection,
1215 bus_context_get_activation_timeout (BusContext *context)
1218 return context->limits.activation_timeout;
1222 bus_context_get_auth_timeout (BusContext *context)
1224 return context->limits.auth_timeout;
1228 bus_context_get_max_completed_connections (BusContext *context)
1230 return context->limits.max_completed_connections;
1234 bus_context_get_max_incomplete_connections (BusContext *context)
1236 return context->limits.max_incomplete_connections;
1240 bus_context_get_max_connections_per_user (BusContext *context)
1242 return context->limits.max_connections_per_user;
1246 bus_context_get_max_pending_activations (BusContext *context)
1248 return context->limits.max_pending_activations;
1252 bus_context_get_max_services_per_connection (BusContext *context)
1254 return context->limits.max_services_per_connection;
1258 bus_context_get_max_match_rules_per_connection (BusContext *context)
1260 return context->limits.max_match_rules_per_connection;
1264 bus_context_get_max_replies_per_connection (BusContext *context)
1266 return context->limits.max_replies_per_connection;
1270 bus_context_get_reply_timeout (BusContext *context)
1272 return context->limits.reply_timeout;
1276 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...) _DBUS_GNUC_PRINTF (3, 4);
1279 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1283 if (!context->syslog)
1285 /* we're not syslogging; just output to stderr */
1286 va_start (args, msg);
1287 vfprintf (stderr, msg, args);
1288 fprintf (stderr, "\n");
1293 va_start (args, msg);
1295 if (context->log_prefix)
1297 DBusString full_msg;
1299 if (!_dbus_string_init (&full_msg))
1301 if (!_dbus_string_append (&full_msg, context->log_prefix))
1303 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1306 _dbus_system_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1308 _dbus_string_free (&full_msg);
1311 _dbus_system_logv (severity, msg, args);
1317 static inline const char *
1318 nonnull (const char *maybe_null,
1319 const char *if_null)
1321 return (maybe_null ? maybe_null : if_null);
1325 * Log something about a message, usually that it was rejected.
1328 complain_about_message (BusContext *context,
1329 const char *error_name,
1330 const char *complaint,
1332 DBusMessage *message,
1333 DBusConnection *sender,
1334 DBusConnection *proposed_recipient,
1335 dbus_bool_t requested_reply,
1339 DBusError stack_error = DBUS_ERROR_INIT;
1340 const char *sender_name;
1341 const char *sender_loginfo;
1342 const char *proposed_recipient_loginfo;
1344 if (error == NULL && !log)
1349 sender_name = bus_connection_get_name (sender);
1350 sender_loginfo = bus_connection_get_loginfo (sender);
1354 sender_name = "(unset)";
1355 sender_loginfo = "(bus)";
1358 if (proposed_recipient != NULL)
1359 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1361 proposed_recipient_loginfo = "bus";
1363 dbus_set_error (&stack_error, error_name,
1364 "%s, %d matched rules; type=\"%s\", sender=\"%s\" (%s) "
1365 "interface=\"%s\" member=\"%s\" error name=\"%s\" "
1366 "requested_reply=\"%d\" destination=\"%s\" (%s)",
1369 dbus_message_type_to_string (dbus_message_get_type (message)),
1372 nonnull (dbus_message_get_interface (message), "(unset)"),
1373 nonnull (dbus_message_get_member (message), "(unset)"),
1374 nonnull (dbus_message_get_error_name (message), "(unset)"),
1376 nonnull (dbus_message_get_destination (message), DBUS_SERVICE_DBUS),
1377 proposed_recipient_loginfo);
1379 /* If we hit OOM while setting the error, this will syslog "out of memory"
1380 * which is itself an indication that something is seriously wrong */
1382 bus_context_log (context, DBUS_SYSTEM_LOG_SECURITY, "%s",
1383 stack_error.message);
1385 dbus_move_error (&stack_error, error);
1389 * addressed_recipient is the recipient specified in the message.
1391 * proposed_recipient is the recipient we're considering sending
1392 * to right this second, and may be an eavesdropper.
1394 * sender is the sender of the message.
1396 * NULL for proposed_recipient or sender definitely means the bus driver.
1398 * NULL for addressed_recipient may mean the bus driver, or may mean
1399 * no destination was specified in the message (e.g. a signal).
1402 bus_context_check_security_policy (BusContext *context,
1403 BusTransaction *transaction,
1404 DBusConnection *sender,
1405 DBusConnection *addressed_recipient,
1406 DBusConnection *proposed_recipient,
1407 DBusMessage *message,
1411 BusClientPolicy *sender_policy;
1412 BusClientPolicy *recipient_policy;
1413 dbus_int32_t toggles;
1416 dbus_bool_t requested_reply;
1418 type = dbus_message_get_type (message);
1419 dest = dbus_message_get_destination (message);
1421 /* dispatch.c was supposed to ensure these invariants */
1422 _dbus_assert (dest != NULL ||
1423 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1424 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1425 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1426 addressed_recipient != NULL ||
1427 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1431 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1432 case DBUS_MESSAGE_TYPE_SIGNAL:
1433 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1434 case DBUS_MESSAGE_TYPE_ERROR:
1438 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1441 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1442 "Message bus will not accept messages of unknown type\n");
1447 requested_reply = FALSE;
1451 /* First verify the SELinux access controls. If allowed then
1452 * go on with the standard checks.
1454 if (!bus_selinux_allows_send (sender, proposed_recipient,
1455 dbus_message_type_to_string (dbus_message_get_type (message)),
1456 dbus_message_get_interface (message),
1457 dbus_message_get_member (message),
1458 dbus_message_get_error_name (message),
1459 dest ? dest : DBUS_SERVICE_DBUS, error))
1461 if (error != NULL && !dbus_error_is_set (error))
1463 /* don't syslog this, just set the error: avc_has_perm should
1464 * have already written to either the audit log or syslog */
1465 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1466 "An SELinux policy prevents this sender from sending this "
1467 "message to this recipient",
1468 0, message, sender, proposed_recipient, FALSE, FALSE, error);
1469 _dbus_verbose ("SELinux security check denying send to service\n");
1475 if (bus_connection_is_active (sender))
1477 sender_policy = bus_connection_get_policy (sender);
1478 _dbus_assert (sender_policy != NULL);
1480 /* Fill in requested_reply variable with TRUE if this is a
1481 * reply and the reply was pending.
1483 if (dbus_message_get_reply_serial (message) != 0)
1485 if (proposed_recipient != NULL /* not to the bus driver */ &&
1486 addressed_recipient == proposed_recipient /* not eavesdropping */)
1490 dbus_error_init (&error2);
1491 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1493 sender, addressed_recipient, message,
1495 if (dbus_error_is_set (&error2))
1497 dbus_move_error (&error2, error);
1505 /* Policy for inactive connections is that they can only send
1506 * the hello message to the bus driver
1508 if (proposed_recipient == NULL &&
1509 dbus_message_is_method_call (message,
1510 DBUS_INTERFACE_DBUS,
1513 _dbus_verbose ("security check allowing %s message\n",
1519 _dbus_verbose ("security check disallowing non-%s message\n",
1522 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1523 "Client tried to send a message other than %s without being registered",
1532 sender_policy = NULL;
1534 /* If the sender is the bus driver, we assume any reply was a
1535 * requested reply as bus driver won't send bogus ones
1537 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1538 dbus_message_get_reply_serial (message) != 0)
1539 requested_reply = TRUE;
1542 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1543 (sender == NULL && sender_policy == NULL));
1545 if (proposed_recipient != NULL)
1547 /* only the bus driver can send to an inactive recipient (as it
1548 * owns no services, so other apps can't address it). Inactive
1549 * recipients can receive any message.
1551 if (bus_connection_is_active (proposed_recipient))
1553 recipient_policy = bus_connection_get_policy (proposed_recipient);
1554 _dbus_assert (recipient_policy != NULL);
1556 else if (sender == NULL)
1558 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1559 recipient_policy = NULL;
1563 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus\n");
1564 recipient_policy = NULL;
1568 recipient_policy = NULL;
1570 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1571 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1572 (proposed_recipient == NULL && recipient_policy == NULL));
1575 if (sender_policy &&
1576 !bus_client_policy_check_can_send (sender_policy,
1580 message, &toggles, &log))
1582 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1583 "Rejected send message", toggles,
1584 message, sender, proposed_recipient, requested_reply,
1585 (addressed_recipient == proposed_recipient), error);
1586 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1592 /* We want to drop this message, and are only not doing so for backwards
1594 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1595 "Would reject message", toggles,
1596 message, sender, proposed_recipient, requested_reply,
1600 if (recipient_policy &&
1601 !bus_client_policy_check_can_receive (recipient_policy,
1605 addressed_recipient, proposed_recipient,
1608 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1609 "Rejected receive message", toggles,
1610 message, sender, proposed_recipient, requested_reply,
1611 (addressed_recipient == proposed_recipient), NULL);
1612 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1616 /* See if limits on size have been exceeded */
1617 if (proposed_recipient &&
1618 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1619 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1621 complain_about_message (context, DBUS_ERROR_LIMITS_EXCEEDED,
1622 "Rejected: destination has a full message queue",
1623 0, message, sender, proposed_recipient, requested_reply, TRUE,
1625 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1629 /* Record that we will allow a reply here in the future (don't
1630 * bother if the recipient is the bus or this is an eavesdropping
1631 * connection). Only the addressed recipient may reply.
1633 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1635 addressed_recipient &&
1636 addressed_recipient == proposed_recipient && /* not eavesdropping */
1637 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1639 sender, addressed_recipient,
1642 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1646 _dbus_verbose ("security policy allowing message\n");