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
26 #include "activation.h"
27 #include "connection.h"
31 #include "config-parser.h"
34 #include "dir-watch.h"
35 #include <dbus/dbus-list.h>
36 #include <dbus/dbus-hash.h>
37 #include <dbus/dbus-credentials.h>
38 #include <dbus/dbus-internals.h>
56 BusConnections *connections;
57 BusActivation *activation;
58 BusRegistry *registry;
60 BusMatchmaker *matchmaker;
62 unsigned int fork : 1;
63 unsigned int syslog : 1;
64 unsigned int keep_umask : 1;
65 unsigned int allow_anonymous : 1;
66 unsigned int systemd_activation : 1;
69 static dbus_int32_t server_data_slot = -1;
76 #define BUS_SERVER_DATA(server) (dbus_server_get_data ((server), server_data_slot))
79 server_get_context (DBusServer *server)
84 if (!dbus_server_allocate_data_slot (&server_data_slot))
87 bd = BUS_SERVER_DATA (server);
90 dbus_server_free_data_slot (&server_data_slot);
94 context = bd->context;
96 dbus_server_free_data_slot (&server_data_slot);
102 server_watch_callback (DBusWatch *watch,
103 unsigned int condition,
106 /* FIXME this can be done in dbus-mainloop.c
107 * if the code in activation.c for the babysitter
108 * watch handler is fixed.
111 return dbus_watch_handle (watch, condition);
115 add_server_watch (DBusWatch *watch,
118 DBusServer *server = data;
121 context = server_get_context (server);
123 return _dbus_loop_add_watch (context->loop,
124 watch, server_watch_callback, server,
129 remove_server_watch (DBusWatch *watch,
132 DBusServer *server = data;
135 context = server_get_context (server);
137 _dbus_loop_remove_watch (context->loop,
138 watch, server_watch_callback, server);
143 server_timeout_callback (DBusTimeout *timeout,
146 /* can return FALSE on OOM but we just let it fire again later */
147 dbus_timeout_handle (timeout);
151 add_server_timeout (DBusTimeout *timeout,
154 DBusServer *server = data;
157 context = server_get_context (server);
159 return _dbus_loop_add_timeout (context->loop,
160 timeout, server_timeout_callback, server, NULL);
164 remove_server_timeout (DBusTimeout *timeout,
167 DBusServer *server = data;
170 context = server_get_context (server);
172 _dbus_loop_remove_timeout (context->loop,
173 timeout, server_timeout_callback, server);
177 new_connection_callback (DBusServer *server,
178 DBusConnection *new_connection,
181 BusContext *context = data;
183 if (!bus_connections_setup_connection (context->connections, new_connection))
185 _dbus_verbose ("No memory to setup new connection\n");
187 /* if we don't do this, it will get unref'd without
188 * being disconnected... kind of strange really
189 * that we have to do this, people won't get it right
192 dbus_connection_close (new_connection);
195 dbus_connection_set_max_received_size (new_connection,
196 context->limits.max_incoming_bytes);
198 dbus_connection_set_max_message_size (new_connection,
199 context->limits.max_message_size);
201 dbus_connection_set_max_received_unix_fds (new_connection,
202 context->limits.max_incoming_unix_fds);
204 dbus_connection_set_max_message_unix_fds (new_connection,
205 context->limits.max_message_unix_fds);
207 dbus_connection_set_allow_anonymous (new_connection,
208 context->allow_anonymous);
210 /* on OOM, we won't have ref'd the connection so it will die. */
214 free_server_data (void *data)
216 BusServerData *bd = data;
222 setup_server (BusContext *context,
224 char **auth_mechanisms,
229 bd = dbus_new0 (BusServerData, 1);
230 if (bd == NULL || !dbus_server_set_data (server,
232 bd, free_server_data))
239 bd->context = context;
241 if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms))
247 dbus_server_set_new_connection_function (server,
248 new_connection_callback,
251 if (!dbus_server_set_watch_functions (server,
262 if (!dbus_server_set_timeout_functions (server,
264 remove_server_timeout,
275 /* This code only gets executed the first time the
276 * config files are parsed. It is not executed
277 * when config files are reloaded.
280 process_config_first_time_only (BusContext *context,
281 BusConfigParser *parser,
282 const DBusString *address,
283 dbus_bool_t systemd_activation,
286 DBusString log_prefix;
288 DBusList **addresses;
289 const char *user, *pidfile;
290 char **auth_mechanisms;
291 DBusList **auth_mechanisms_list;
295 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
298 auth_mechanisms = NULL;
300 context->systemd_activation = systemd_activation;
302 /* Check for an existing pid file. Of course this is a race;
303 * we'd have to use fcntl() locks on the pid file to
304 * avoid that. But we want to check for the pid file
305 * before overwriting any existing sockets, etc.
307 pidfile = bus_config_parser_get_pidfile (parser);
313 _dbus_string_init_const (&u, pidfile);
315 if (_dbus_stat (&u, &stbuf, NULL))
321 _dbus_string_init (&p);
322 _dbus_file_get_contents(&p, &u, NULL);
323 _dbus_string_parse_int(&p, 0, &pid, NULL);
324 _dbus_string_free(&p);
326 if ((kill((int)pid, 0))) {
327 dbus_set_error(NULL, DBUS_ERROR_FILE_EXISTS,
328 "pid %ld not running, removing stale pid file\n",
330 _dbus_delete_file(&u, NULL);
333 dbus_set_error (error, DBUS_ERROR_FAILED,
334 "The pid file \"%s\" exists, if the message bus is not running, remove this file",
343 /* keep around the pid filename so we can delete it later */
344 context->pidfile = _dbus_strdup (pidfile);
346 /* note that type may be NULL */
347 context->type = _dbus_strdup (bus_config_parser_get_type (parser));
348 if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
351 user = bus_config_parser_get_user (parser);
354 context->user = _dbus_strdup (user);
355 if (context->user == NULL)
359 /* Set up the prefix for syslog messages */
360 if (!_dbus_string_init (&log_prefix))
362 if (context->type && !strcmp (context->type, "system"))
364 if (!_dbus_string_append (&log_prefix, "[system] "))
367 else if (context->type && !strcmp (context->type, "session"))
369 DBusCredentials *credentials;
371 credentials = _dbus_credentials_new_from_current_process ();
374 if (!_dbus_string_append (&log_prefix, "[session "))
376 _dbus_credentials_unref (credentials);
379 if (!_dbus_credentials_to_string_append (credentials, &log_prefix))
381 _dbus_credentials_unref (credentials);
384 if (!_dbus_string_append (&log_prefix, "] "))
386 _dbus_credentials_unref (credentials);
389 _dbus_credentials_unref (credentials);
391 if (!_dbus_string_steal_data (&log_prefix, &context->log_prefix))
393 _dbus_string_free (&log_prefix);
395 /* Build an array of auth mechanisms */
397 auth_mechanisms_list = bus_config_parser_get_mechanisms (parser);
398 len = _dbus_list_get_length (auth_mechanisms_list);
404 auth_mechanisms = dbus_new0 (char*, len + 1);
405 if (auth_mechanisms == NULL)
409 link = _dbus_list_get_first_link (auth_mechanisms_list);
412 auth_mechanisms[i] = _dbus_strdup (link->data);
413 if (auth_mechanisms[i] == NULL)
415 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;
505 BusActivation *new_activation;
507 const char *servicehelper;
512 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
517 if (!_dbus_string_init (&full_address))
523 /* get our limits and timeout lengths */
524 bus_config_parser_get_limits (parser, &context->limits);
527 bus_policy_unref (context->policy);
528 context->policy = bus_config_parser_steal_policy (parser);
529 _dbus_assert (context->policy != NULL);
531 /* We have to build the address backward, so that
532 * <listen> later in the config file have priority
534 link = _dbus_list_get_last_link (&context->servers);
537 addr = dbus_server_get_address (link->data);
544 if (_dbus_string_get_length (&full_address) > 0)
546 if (!_dbus_string_append (&full_address, ";"))
553 if (!_dbus_string_append (&full_address, addr))
562 link = _dbus_list_get_prev_link (&context->servers, link);
566 dbus_free (context->address);
568 if (!_dbus_string_copy_data (&full_address, &context->address))
574 /* get the service directories */
575 dirs = bus_config_parser_get_service_dirs (parser);
577 /* and the service helper */
578 servicehelper = bus_config_parser_get_servicehelper (parser);
580 s = _dbus_strdup(servicehelper);
581 if (s == NULL && servicehelper != NULL)
588 dbus_free(context->servicehelper);
589 context->servicehelper = s;
592 /* Create activation subsystem */
593 if (context->activation)
595 if (!bus_activation_reload (context->activation, &full_address, dirs, error))
600 context->activation = bus_activation_new (context, &full_address, dirs, error);
603 if (context->activation == NULL)
605 _DBUS_ASSERT_ERROR_IS_SET (error);
609 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
613 _dbus_string_free (&full_address);
622 list_concat_new (DBusList **a,
630 for (link = _dbus_list_get_first_link (a); link; link = _dbus_list_get_next_link (a, link))
632 if (!_dbus_list_append (result, link->data))
635 for (link = _dbus_list_get_first_link (b); link; link = _dbus_list_get_next_link (b, link))
637 if (!_dbus_list_append (result, link->data))
643 _dbus_list_clear (result);
648 raise_file_descriptor_limit (BusContext *context)
651 /* I just picked this out of thin air; we need some extra
652 * descriptors for things like any internal pipes we create,
653 * inotify, connections to SELinux, etc.
655 unsigned int arbitrary_extra_fds = 32;
658 limit = context->limits.max_completed_connections +
659 context->limits.max_incomplete_connections
660 + arbitrary_extra_fds;
662 _dbus_request_file_descriptor_limit (limit);
666 process_config_postinit (BusContext *context,
667 BusConfigParser *parser,
670 DBusHashTable *service_context_table;
671 DBusList *watched_dirs = NULL;
673 raise_file_descriptor_limit (context);
675 service_context_table = bus_config_parser_steal_service_context_table (parser);
676 if (!bus_registry_set_service_context_table (context->registry,
677 service_context_table))
683 _dbus_hash_table_unref (service_context_table);
685 /* We need to monitor both the configuration directories and directories
686 * containing .service files.
688 if (!list_concat_new (bus_config_parser_get_conf_dirs (parser),
689 bus_config_parser_get_service_dirs (parser),
696 bus_set_watched_dirs (context, &watched_dirs);
698 _dbus_list_clear (&watched_dirs);
704 bus_context_new (const DBusString *config_file,
705 ForceForkSetting force_fork,
706 DBusPipe *print_addr_pipe,
707 DBusPipe *print_pid_pipe,
708 const DBusString *address,
709 dbus_bool_t systemd_activation,
712 DBusString log_prefix;
714 BusConfigParser *parser;
716 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
721 if (!dbus_server_allocate_data_slot (&server_data_slot))
727 context = dbus_new0 (BusContext, 1);
733 context->refcount = 1;
735 _dbus_generate_uuid (&context->uuid);
737 if (!_dbus_string_copy_data (config_file, &context->config_file))
743 context->loop = _dbus_loop_new ();
744 if (context->loop == NULL)
750 context->registry = bus_registry_new (context);
751 if (context->registry == NULL)
757 parser = bus_config_load (config_file, TRUE, NULL, error);
760 _DBUS_ASSERT_ERROR_IS_SET (error);
764 if (!process_config_first_time_only (context, parser, address, systemd_activation, error))
766 _DBUS_ASSERT_ERROR_IS_SET (error);
769 if (!process_config_every_time (context, parser, FALSE, error))
771 _DBUS_ASSERT_ERROR_IS_SET (error);
775 /* we need another ref of the server data slot for the context
778 if (!dbus_server_allocate_data_slot (&server_data_slot))
779 _dbus_assert_not_reached ("second ref of server data slot failed");
781 /* Note that we don't know whether the print_addr_pipe is
782 * one of the sockets we're using to listen on, or some
783 * other random thing. But I think the answer is "don't do
786 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
789 const char *a = bus_context_get_address (context);
792 _dbus_assert (a != NULL);
793 if (!_dbus_string_init (&addr))
799 if (!_dbus_string_append (&addr, a) ||
800 !_dbus_string_append (&addr, "\n"))
802 _dbus_string_free (&addr);
807 bytes = _dbus_string_get_length (&addr);
808 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
810 /* pipe write returns an error on failure but not short write */
811 if (error != NULL && !dbus_error_is_set (error))
813 dbus_set_error (error, DBUS_ERROR_FAILED,
814 "Printing message bus address: did not write all bytes\n");
816 _dbus_string_free (&addr);
820 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
821 _dbus_pipe_close (print_addr_pipe, NULL);
823 _dbus_string_free (&addr);
826 context->connections = bus_connections_new (context);
827 if (context->connections == NULL)
833 context->matchmaker = bus_matchmaker_new ();
834 if (context->matchmaker == NULL)
840 /* check user before we fork */
841 if (context->user != NULL)
843 if (!_dbus_verify_daemon_user (context->user))
845 dbus_set_error (error, DBUS_ERROR_FAILED,
846 "Could not get UID and GID for username \"%s\"",
852 /* Now become a daemon if appropriate and write out pid file in any case */
856 if (context->pidfile)
857 _dbus_string_init_const (&u, context->pidfile);
859 if ((force_fork != FORK_NEVER && context->fork) || force_fork == 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)
1286 va_start (args, msg);
1288 if (context->log_prefix)
1290 DBusString full_msg;
1292 if (!_dbus_string_init (&full_msg))
1294 if (!_dbus_string_append (&full_msg, context->log_prefix))
1296 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1299 _dbus_system_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1301 _dbus_string_free (&full_msg);
1304 _dbus_system_logv (severity, msg, args);
1310 static inline const char *
1311 nonnull (const char *maybe_null,
1312 const char *if_null)
1314 return (maybe_null ? maybe_null : if_null);
1318 * Log something about a message, usually that it was rejected.
1321 complain_about_message (BusContext *context,
1322 const char *error_name,
1323 const char *complaint,
1325 DBusMessage *message,
1326 DBusConnection *sender,
1327 DBusConnection *proposed_recipient,
1328 dbus_bool_t requested_reply,
1332 DBusError stack_error = DBUS_ERROR_INIT;
1333 const char *sender_name;
1334 const char *sender_loginfo;
1335 const char *proposed_recipient_loginfo;
1337 if (error == NULL && !(context->syslog && log))
1342 sender_name = bus_connection_get_name (sender);
1343 sender_loginfo = bus_connection_get_loginfo (sender);
1347 sender_name = "(unset)";
1348 sender_loginfo = "(bus)";
1351 if (proposed_recipient != NULL)
1352 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1354 proposed_recipient_loginfo = "bus";
1356 dbus_set_error (&stack_error, error_name,
1357 "%s, %d matched rules; type=\"%s\", sender=\"%s\" (%s) "
1358 "interface=\"%s\" member=\"%s\" error name=\"%s\" "
1359 "requested_reply=\"%d\" destination=\"%s\" (%s)",
1362 dbus_message_type_to_string (dbus_message_get_type (message)),
1365 nonnull (dbus_message_get_interface (message), "(unset)"),
1366 nonnull (dbus_message_get_member (message), "(unset)"),
1367 nonnull (dbus_message_get_error_name (message), "(unset)"),
1369 nonnull (dbus_message_get_destination (message), DBUS_SERVICE_DBUS),
1370 proposed_recipient_loginfo);
1372 /* If we hit OOM while setting the error, this will syslog "out of memory"
1373 * which is itself an indication that something is seriously wrong */
1375 bus_context_log (context, DBUS_SYSTEM_LOG_SECURITY, "%s",
1376 stack_error.message);
1378 dbus_move_error (&stack_error, error);
1382 * addressed_recipient is the recipient specified in the message.
1384 * proposed_recipient is the recipient we're considering sending
1385 * to right this second, and may be an eavesdropper.
1387 * sender is the sender of the message.
1389 * NULL for proposed_recipient or sender definitely means the bus driver.
1391 * NULL for addressed_recipient may mean the bus driver, or may mean
1392 * no destination was specified in the message (e.g. a signal).
1395 bus_context_check_security_policy (BusContext *context,
1396 BusTransaction *transaction,
1397 DBusConnection *sender,
1398 DBusConnection *addressed_recipient,
1399 DBusConnection *proposed_recipient,
1400 DBusMessage *message,
1404 BusClientPolicy *sender_policy;
1405 BusClientPolicy *recipient_policy;
1406 dbus_int32_t toggles;
1409 dbus_bool_t requested_reply;
1410 const char *sender_name;
1411 const char *sender_loginfo;
1412 const char *proposed_recipient_loginfo;
1414 type = dbus_message_get_type (message);
1415 dest = dbus_message_get_destination (message);
1417 /* dispatch.c was supposed to ensure these invariants */
1418 _dbus_assert (dest != NULL ||
1419 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1420 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1421 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1422 addressed_recipient != NULL ||
1423 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1427 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1428 case DBUS_MESSAGE_TYPE_SIGNAL:
1429 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1430 case DBUS_MESSAGE_TYPE_ERROR:
1434 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1437 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1438 "Message bus will not accept messages of unknown type\n");
1443 requested_reply = FALSE;
1447 /* First verify the SELinux access controls. If allowed then
1448 * go on with the standard checks.
1450 if (!bus_selinux_allows_send (sender, proposed_recipient,
1451 dbus_message_type_to_string (dbus_message_get_type (message)),
1452 dbus_message_get_interface (message),
1453 dbus_message_get_member (message),
1454 dbus_message_get_error_name (message),
1455 dest ? dest : DBUS_SERVICE_DBUS, error))
1457 if (error != NULL && !dbus_error_is_set (error))
1459 /* don't syslog this, just set the error: avc_has_perm should
1460 * have already written to either the audit log or syslog */
1461 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1462 "An SELinux policy prevents this sender from sending this "
1463 "message to this recipient",
1464 0, message, sender, proposed_recipient, FALSE, FALSE, error);
1465 _dbus_verbose ("SELinux security check denying send to service\n");
1471 if (bus_connection_is_active (sender))
1473 sender_policy = bus_connection_get_policy (sender);
1474 _dbus_assert (sender_policy != NULL);
1476 /* Fill in requested_reply variable with TRUE if this is a
1477 * reply and the reply was pending.
1479 if (dbus_message_get_reply_serial (message) != 0)
1481 if (proposed_recipient != NULL /* not to the bus driver */ &&
1482 addressed_recipient == proposed_recipient /* not eavesdropping */)
1486 dbus_error_init (&error2);
1487 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1489 sender, addressed_recipient, message,
1491 if (dbus_error_is_set (&error2))
1493 dbus_move_error (&error2, error);
1501 /* Policy for inactive connections is that they can only send
1502 * the hello message to the bus driver
1504 if (proposed_recipient == NULL &&
1505 dbus_message_is_method_call (message,
1506 DBUS_INTERFACE_DBUS,
1509 _dbus_verbose ("security check allowing %s message\n",
1515 _dbus_verbose ("security check disallowing non-%s message\n",
1518 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1519 "Client tried to send a message other than %s without being registered",
1528 sender_policy = NULL;
1530 /* If the sender is the bus driver, we assume any reply was a
1531 * requested reply as bus driver won't send bogus ones
1533 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1534 dbus_message_get_reply_serial (message) != 0)
1535 requested_reply = TRUE;
1538 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1539 (sender == NULL && sender_policy == NULL));
1541 if (proposed_recipient != NULL)
1543 /* only the bus driver can send to an inactive recipient (as it
1544 * owns no services, so other apps can't address it). Inactive
1545 * recipients can receive any message.
1547 if (bus_connection_is_active (proposed_recipient))
1549 recipient_policy = bus_connection_get_policy (proposed_recipient);
1550 _dbus_assert (recipient_policy != NULL);
1552 else if (sender == NULL)
1554 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1555 recipient_policy = NULL;
1559 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus\n");
1560 recipient_policy = NULL;
1564 recipient_policy = NULL;
1566 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1567 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1568 (proposed_recipient == NULL && recipient_policy == NULL));
1571 if (sender_policy &&
1572 !bus_client_policy_check_can_send (sender_policy,
1576 message, &toggles, &log))
1578 const char *msg = "Rejected send message, %d matched rules; "
1579 "type=\"%s\", sender=\"%s\" (%s) interface=\"%s\" member=\"%s\" error name=\"%s\" requested_reply=%d destination=\"%s\" (%s))";
1581 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1582 "Rejected send message", toggles,
1583 message, sender, proposed_recipient, requested_reply,
1584 (addressed_recipient == proposed_recipient), error);
1585 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1591 /* We want to drop this message, and are only not doing so for backwards
1593 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1594 "Would reject message", toggles,
1595 message, sender, proposed_recipient, requested_reply,
1599 if (recipient_policy &&
1600 !bus_client_policy_check_can_receive (recipient_policy,
1604 addressed_recipient, proposed_recipient,
1607 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1608 "Rejected receive message", toggles,
1609 message, sender, proposed_recipient, requested_reply,
1610 (addressed_recipient == proposed_recipient), NULL);
1611 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1615 /* See if limits on size have been exceeded */
1616 if (proposed_recipient &&
1617 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1618 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1620 complain_about_message (context, DBUS_ERROR_LIMITS_EXCEEDED,
1621 "Rejected: destination has a full message queue",
1622 0, message, sender, proposed_recipient, requested_reply, TRUE,
1624 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1628 /* Record that we will allow a reply here in the future (don't
1629 * bother if the recipient is the bus or this is an eavesdropping
1630 * connection). Only the addressed recipient may reply.
1632 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1634 addressed_recipient &&
1635 addressed_recipient == proposed_recipient && /* not eavesdropping */
1636 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1638 sender, addressed_recipient,
1641 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1645 _dbus_verbose ("security policy allowing message\n");