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 server_watch_callback (DBusWatch *watch,
107 unsigned int condition,
110 /* FIXME this can be done in dbus-mainloop.c
111 * if the code in activation.c for the babysitter
112 * watch handler is fixed.
115 return dbus_watch_handle (watch, condition);
119 add_server_watch (DBusWatch *watch,
122 DBusServer *server = data;
125 context = server_get_context (server);
127 return _dbus_loop_add_watch (context->loop,
128 watch, server_watch_callback, server,
133 remove_server_watch (DBusWatch *watch,
136 DBusServer *server = data;
139 context = server_get_context (server);
141 _dbus_loop_remove_watch (context->loop,
142 watch, server_watch_callback, server);
147 server_timeout_callback (DBusTimeout *timeout,
150 /* can return FALSE on OOM but we just let it fire again later */
151 dbus_timeout_handle (timeout);
155 add_server_timeout (DBusTimeout *timeout,
158 DBusServer *server = data;
161 context = server_get_context (server);
163 return _dbus_loop_add_timeout (context->loop,
164 timeout, server_timeout_callback, server, NULL);
168 remove_server_timeout (DBusTimeout *timeout,
171 DBusServer *server = data;
174 context = server_get_context (server);
176 _dbus_loop_remove_timeout (context->loop,
177 timeout, server_timeout_callback, server);
181 new_connection_callback (DBusServer *server,
182 DBusConnection *new_connection,
185 BusContext *context = data;
187 if (!bus_connections_setup_connection (context->connections, new_connection))
189 _dbus_verbose ("No memory to setup new connection\n");
191 /* if we don't do this, it will get unref'd without
192 * being disconnected... kind of strange really
193 * that we have to do this, people won't get it right
196 dbus_connection_close (new_connection);
199 dbus_connection_set_max_received_size (new_connection,
200 context->limits.max_incoming_bytes);
202 dbus_connection_set_max_message_size (new_connection,
203 context->limits.max_message_size);
205 dbus_connection_set_max_received_unix_fds (new_connection,
206 context->limits.max_incoming_unix_fds);
208 dbus_connection_set_max_message_unix_fds (new_connection,
209 context->limits.max_message_unix_fds);
211 dbus_connection_set_allow_anonymous (new_connection,
212 context->allow_anonymous);
214 /* on OOM, we won't have ref'd the connection so it will die. */
218 free_server_data (void *data)
220 BusServerData *bd = data;
226 setup_server (BusContext *context,
228 char **auth_mechanisms,
233 bd = dbus_new0 (BusServerData, 1);
234 if (bd == NULL || !dbus_server_set_data (server,
236 bd, free_server_data))
243 bd->context = context;
245 if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms))
251 dbus_server_set_new_connection_function (server,
252 new_connection_callback,
255 if (!dbus_server_set_watch_functions (server,
266 if (!dbus_server_set_timeout_functions (server,
268 remove_server_timeout,
279 /* This code only gets executed the first time the
280 * config files are parsed. It is not executed
281 * when config files are reloaded.
284 process_config_first_time_only (BusContext *context,
285 BusConfigParser *parser,
286 const DBusString *address,
287 dbus_bool_t systemd_activation,
290 DBusString log_prefix;
292 DBusList **addresses;
293 const char *user, *pidfile;
294 char **auth_mechanisms;
295 DBusList **auth_mechanisms_list;
299 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
302 auth_mechanisms = NULL;
304 _dbus_init_system_log ();
306 context->systemd_activation = systemd_activation;
308 /* Check for an existing pid file. Of course this is a race;
309 * we'd have to use fcntl() locks on the pid file to
310 * avoid that. But we want to check for the pid file
311 * before overwriting any existing sockets, etc.
313 pidfile = bus_config_parser_get_pidfile (parser);
319 _dbus_string_init_const (&u, pidfile);
321 if (_dbus_stat (&u, &stbuf, NULL))
327 _dbus_string_init (&p);
328 _dbus_file_get_contents(&p, &u, NULL);
329 _dbus_string_parse_int(&p, 0, &pid, NULL);
330 _dbus_string_free(&p);
332 if ((kill((int)pid, 0))) {
333 dbus_set_error(NULL, DBUS_ERROR_FILE_EXISTS,
334 "pid %ld not running, removing stale pid file\n",
336 _dbus_delete_file(&u, NULL);
339 dbus_set_error (error, DBUS_ERROR_FAILED,
340 "The pid file \"%s\" exists, if the message bus is not running, remove this file",
349 /* keep around the pid filename so we can delete it later */
350 context->pidfile = _dbus_strdup (pidfile);
352 /* note that type may be NULL */
353 context->type = _dbus_strdup (bus_config_parser_get_type (parser));
354 if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
357 user = bus_config_parser_get_user (parser);
360 context->user = _dbus_strdup (user);
361 if (context->user == NULL)
365 /* Set up the prefix for syslog messages */
366 if (!_dbus_string_init (&log_prefix))
368 if (context->type && !strcmp (context->type, "system"))
370 if (!_dbus_string_append (&log_prefix, "[system] "))
373 else if (context->type && !strcmp (context->type, "session"))
375 DBusCredentials *credentials;
377 credentials = _dbus_credentials_new_from_current_process ();
380 if (!_dbus_string_append (&log_prefix, "[session "))
382 _dbus_credentials_unref (credentials);
385 if (!_dbus_credentials_to_string_append (credentials, &log_prefix))
387 _dbus_credentials_unref (credentials);
390 if (!_dbus_string_append (&log_prefix, "] "))
392 _dbus_credentials_unref (credentials);
395 _dbus_credentials_unref (credentials);
397 if (!_dbus_string_steal_data (&log_prefix, &context->log_prefix))
399 _dbus_string_free (&log_prefix);
401 /* Build an array of auth mechanisms */
403 auth_mechanisms_list = bus_config_parser_get_mechanisms (parser);
404 len = _dbus_list_get_length (auth_mechanisms_list);
410 auth_mechanisms = dbus_new0 (char*, len + 1);
411 if (auth_mechanisms == NULL)
415 link = _dbus_list_get_first_link (auth_mechanisms_list);
418 auth_mechanisms[i] = _dbus_strdup (link->data);
419 if (auth_mechanisms[i] == NULL)
421 link = _dbus_list_get_next_link (auth_mechanisms_list, link);
427 auth_mechanisms = NULL;
430 /* Listen on our addresses */
436 server = dbus_server_listen (_dbus_string_get_const_data(address), error);
439 _DBUS_ASSERT_ERROR_IS_SET (error);
442 else if (!setup_server (context, server, auth_mechanisms, error))
444 _DBUS_ASSERT_ERROR_IS_SET (error);
448 if (!_dbus_list_append (&context->servers, server))
453 addresses = bus_config_parser_get_addresses (parser);
455 link = _dbus_list_get_first_link (addresses);
460 server = dbus_server_listen (link->data, error);
463 _DBUS_ASSERT_ERROR_IS_SET (error);
466 else if (!setup_server (context, server, auth_mechanisms, error))
468 _DBUS_ASSERT_ERROR_IS_SET (error);
472 if (!_dbus_list_append (&context->servers, server))
475 link = _dbus_list_get_next_link (addresses, link);
479 context->fork = bus_config_parser_get_fork (parser);
480 context->syslog = bus_config_parser_get_syslog (parser);
481 context->keep_umask = bus_config_parser_get_keep_umask (parser);
482 context->allow_anonymous = bus_config_parser_get_allow_anonymous (parser);
484 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
488 dbus_free_string_array (auth_mechanisms);
493 dbus_free_string_array (auth_mechanisms);
497 /* This code gets executed every time the config files
498 * are parsed: both during BusContext construction
499 * and on reloads. This function is slightly screwy
500 * since it can do a "half reload" in out-of-memory
501 * situations. Realistically, unlikely to ever matter.
504 process_config_every_time (BusContext *context,
505 BusConfigParser *parser,
506 dbus_bool_t is_reload,
509 DBusString full_address;
512 BusActivation *new_activation;
514 const char *servicehelper;
519 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
524 if (!_dbus_string_init (&full_address))
530 /* get our limits and timeout lengths */
531 bus_config_parser_get_limits (parser, &context->limits);
534 bus_policy_unref (context->policy);
535 context->policy = bus_config_parser_steal_policy (parser);
536 _dbus_assert (context->policy != NULL);
538 /* We have to build the address backward, so that
539 * <listen> later in the config file have priority
541 link = _dbus_list_get_last_link (&context->servers);
544 addr = dbus_server_get_address (link->data);
551 if (_dbus_string_get_length (&full_address) > 0)
553 if (!_dbus_string_append (&full_address, ";"))
560 if (!_dbus_string_append (&full_address, addr))
569 link = _dbus_list_get_prev_link (&context->servers, link);
573 dbus_free (context->address);
575 if (!_dbus_string_copy_data (&full_address, &context->address))
581 /* get the service directories */
582 dirs = bus_config_parser_get_service_dirs (parser);
584 /* and the service helper */
585 servicehelper = bus_config_parser_get_servicehelper (parser);
587 s = _dbus_strdup(servicehelper);
588 if (s == NULL && servicehelper != NULL)
595 dbus_free(context->servicehelper);
596 context->servicehelper = s;
599 /* Create activation subsystem */
600 if (context->activation)
602 if (!bus_activation_reload (context->activation, &full_address, dirs, error))
607 context->activation = bus_activation_new (context, &full_address, dirs, error);
610 if (context->activation == NULL)
612 _DBUS_ASSERT_ERROR_IS_SET (error);
616 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
620 _dbus_string_free (&full_address);
629 list_concat_new (DBusList **a,
637 for (link = _dbus_list_get_first_link (a); link; link = _dbus_list_get_next_link (a, link))
639 if (!_dbus_list_append (result, link->data))
642 for (link = _dbus_list_get_first_link (b); link; link = _dbus_list_get_next_link (b, link))
644 if (!_dbus_list_append (result, link->data))
650 _dbus_list_clear (result);
655 raise_file_descriptor_limit (BusContext *context)
658 /* I just picked this out of thin air; we need some extra
659 * descriptors for things like any internal pipes we create,
660 * inotify, connections to SELinux, etc.
662 unsigned int arbitrary_extra_fds = 32;
665 limit = context->limits.max_completed_connections +
666 context->limits.max_incomplete_connections
667 + arbitrary_extra_fds;
669 _dbus_request_file_descriptor_limit (limit);
673 process_config_postinit (BusContext *context,
674 BusConfigParser *parser,
677 DBusHashTable *service_context_table;
678 DBusList *watched_dirs = NULL;
680 raise_file_descriptor_limit (context);
682 service_context_table = bus_config_parser_steal_service_context_table (parser);
683 if (!bus_registry_set_service_context_table (context->registry,
684 service_context_table))
690 _dbus_hash_table_unref (service_context_table);
692 /* We need to monitor both the configuration directories and directories
693 * containing .service files.
695 if (!list_concat_new (bus_config_parser_get_conf_dirs (parser),
696 bus_config_parser_get_service_dirs (parser),
703 bus_set_watched_dirs (context, &watched_dirs);
705 _dbus_list_clear (&watched_dirs);
711 bus_context_new (const DBusString *config_file,
712 ForceForkSetting force_fork,
713 DBusPipe *print_addr_pipe,
714 DBusPipe *print_pid_pipe,
715 const DBusString *address,
716 dbus_bool_t systemd_activation,
719 DBusString log_prefix;
721 BusConfigParser *parser;
723 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
728 if (!dbus_server_allocate_data_slot (&server_data_slot))
734 context = dbus_new0 (BusContext, 1);
740 context->refcount = 1;
742 _dbus_generate_uuid (&context->uuid);
744 if (!_dbus_string_copy_data (config_file, &context->config_file))
750 context->loop = _dbus_loop_new ();
751 if (context->loop == NULL)
757 context->registry = bus_registry_new (context);
758 if (context->registry == NULL)
764 parser = bus_config_load (config_file, TRUE, NULL, error);
767 _DBUS_ASSERT_ERROR_IS_SET (error);
771 if (!process_config_first_time_only (context, parser, address, systemd_activation, error))
773 _DBUS_ASSERT_ERROR_IS_SET (error);
776 if (!process_config_every_time (context, parser, FALSE, error))
778 _DBUS_ASSERT_ERROR_IS_SET (error);
782 /* we need another ref of the server data slot for the context
785 if (!dbus_server_allocate_data_slot (&server_data_slot))
786 _dbus_assert_not_reached ("second ref of server data slot failed");
788 /* Note that we don't know whether the print_addr_pipe is
789 * one of the sockets we're using to listen on, or some
790 * other random thing. But I think the answer is "don't do
793 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
796 const char *a = bus_context_get_address (context);
799 _dbus_assert (a != NULL);
800 if (!_dbus_string_init (&addr))
806 if (!_dbus_string_append (&addr, a) ||
807 !_dbus_string_append (&addr, "\n"))
809 _dbus_string_free (&addr);
814 bytes = _dbus_string_get_length (&addr);
815 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
817 /* pipe write returns an error on failure but not short write */
818 if (error != NULL && !dbus_error_is_set (error))
820 dbus_set_error (error, DBUS_ERROR_FAILED,
821 "Printing message bus address: did not write all bytes\n");
823 _dbus_string_free (&addr);
827 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
828 _dbus_pipe_close (print_addr_pipe, NULL);
830 _dbus_string_free (&addr);
833 context->connections = bus_connections_new (context);
834 if (context->connections == NULL)
840 context->matchmaker = bus_matchmaker_new ();
841 if (context->matchmaker == NULL)
847 /* check user before we fork */
848 if (context->user != NULL)
850 if (!_dbus_verify_daemon_user (context->user))
852 dbus_set_error (error, DBUS_ERROR_FAILED,
853 "Could not get UID and GID for username \"%s\"",
859 /* Now become a daemon if appropriate and write out pid file in any case */
863 if (context->pidfile)
864 _dbus_string_init_const (&u, context->pidfile);
866 if ((force_fork != FORK_NEVER && context->fork) || force_fork == FORK_ALWAYS)
868 _dbus_verbose ("Forking and becoming daemon\n");
870 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
873 context->keep_umask))
875 _DBUS_ASSERT_ERROR_IS_SET (error);
881 _dbus_verbose ("Fork not requested\n");
883 /* Need to write PID file and to PID pipe for ourselves,
884 * not for the child process. This is a no-op if the pidfile
885 * is NULL and print_pid_pipe is NULL.
887 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
892 _DBUS_ASSERT_ERROR_IS_SET (error);
898 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
899 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
900 _dbus_pipe_close (print_pid_pipe, NULL);
902 if (!bus_selinux_full_init ())
904 bus_context_log (context, DBUS_SYSTEM_LOG_FATAL, "SELinux enabled but AVC initialization failed; check system log\n");
907 if (!process_config_postinit (context, parser, error))
909 _DBUS_ASSERT_ERROR_IS_SET (error);
915 bus_config_parser_unref (parser);
919 /* Here we change our credentials if required,
920 * as soon as we've set up our sockets and pidfile
922 if (context->user != NULL)
924 if (!_dbus_change_to_daemon_user (context->user, error))
926 _DBUS_ASSERT_ERROR_IS_SET (error);
931 /* FIXME - why not just put this in full_init() below? */
932 bus_selinux_audit_init ();
936 dbus_server_free_data_slot (&server_data_slot);
942 bus_config_parser_unref (parser);
944 bus_context_unref (context);
946 if (server_data_slot >= 0)
947 dbus_server_free_data_slot (&server_data_slot);
953 bus_context_get_id (BusContext *context,
956 return _dbus_uuid_encode (&context->uuid, uuid);
960 bus_context_reload_config (BusContext *context,
963 BusConfigParser *parser;
964 DBusString config_file;
967 /* Flush the user database cache */
968 _dbus_flush_caches ();
971 _dbus_string_init_const (&config_file, context->config_file);
972 parser = bus_config_load (&config_file, TRUE, NULL, error);
975 _DBUS_ASSERT_ERROR_IS_SET (error);
979 if (!process_config_every_time (context, parser, TRUE, error))
981 _DBUS_ASSERT_ERROR_IS_SET (error);
984 if (!process_config_postinit (context, parser, error))
986 _DBUS_ASSERT_ERROR_IS_SET (error);
991 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
994 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
996 bus_config_parser_unref (parser);
1001 shutdown_server (BusContext *context,
1004 if (server == NULL ||
1005 !dbus_server_get_is_connected (server))
1008 if (!dbus_server_set_watch_functions (server,
1012 _dbus_assert_not_reached ("setting watch functions to NULL failed");
1014 if (!dbus_server_set_timeout_functions (server,
1018 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
1020 dbus_server_disconnect (server);
1024 bus_context_shutdown (BusContext *context)
1028 link = _dbus_list_get_first_link (&context->servers);
1029 while (link != NULL)
1031 shutdown_server (context, link->data);
1033 link = _dbus_list_get_next_link (&context->servers, link);
1038 bus_context_ref (BusContext *context)
1040 _dbus_assert (context->refcount > 0);
1041 context->refcount += 1;
1047 bus_context_unref (BusContext *context)
1049 _dbus_assert (context->refcount > 0);
1050 context->refcount -= 1;
1052 if (context->refcount == 0)
1056 _dbus_verbose ("Finalizing bus context %p\n", context);
1058 bus_context_shutdown (context);
1060 if (context->connections)
1062 bus_connections_unref (context->connections);
1063 context->connections = NULL;
1066 if (context->registry)
1068 bus_registry_unref (context->registry);
1069 context->registry = NULL;
1072 if (context->activation)
1074 bus_activation_unref (context->activation);
1075 context->activation = NULL;
1078 link = _dbus_list_get_first_link (&context->servers);
1079 while (link != NULL)
1081 dbus_server_unref (link->data);
1083 link = _dbus_list_get_next_link (&context->servers, link);
1085 _dbus_list_clear (&context->servers);
1087 if (context->policy)
1089 bus_policy_unref (context->policy);
1090 context->policy = NULL;
1095 _dbus_loop_unref (context->loop);
1096 context->loop = NULL;
1099 if (context->matchmaker)
1101 bus_matchmaker_unref (context->matchmaker);
1102 context->matchmaker = NULL;
1105 dbus_free (context->config_file);
1106 dbus_free (context->log_prefix);
1107 dbus_free (context->type);
1108 dbus_free (context->address);
1109 dbus_free (context->user);
1110 dbus_free (context->servicehelper);
1112 if (context->pidfile)
1115 _dbus_string_init_const (&u, context->pidfile);
1117 /* Deliberately ignore errors here, since there's not much
1118 * we can do about it, and we're exiting anyways.
1120 _dbus_delete_file (&u, NULL);
1122 dbus_free (context->pidfile);
1124 dbus_free (context);
1126 dbus_server_free_data_slot (&server_data_slot);
1130 /* type may be NULL */
1132 bus_context_get_type (BusContext *context)
1134 return context->type;
1138 bus_context_get_address (BusContext *context)
1140 return context->address;
1144 bus_context_get_servicehelper (BusContext *context)
1146 return context->servicehelper;
1150 bus_context_get_systemd_activation (BusContext *context)
1152 return context->systemd_activation;
1156 bus_context_get_registry (BusContext *context)
1158 return context->registry;
1162 bus_context_get_connections (BusContext *context)
1164 return context->connections;
1168 bus_context_get_activation (BusContext *context)
1170 return context->activation;
1174 bus_context_get_matchmaker (BusContext *context)
1176 return context->matchmaker;
1180 bus_context_get_loop (BusContext *context)
1182 return context->loop;
1186 bus_context_allow_unix_user (BusContext *context,
1189 return bus_policy_allow_unix_user (context->policy,
1193 /* For now this is never actually called because the default
1194 * DBusConnection behavior of 'same user that owns the bus can connect'
1195 * is all it would do.
1198 bus_context_allow_windows_user (BusContext *context,
1199 const char *windows_sid)
1201 return bus_policy_allow_windows_user (context->policy,
1206 bus_context_get_policy (BusContext *context)
1208 return context->policy;
1212 bus_context_create_client_policy (BusContext *context,
1213 DBusConnection *connection,
1216 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1217 return bus_policy_create_client_policy (context->policy, connection,
1222 bus_context_get_activation_timeout (BusContext *context)
1225 return context->limits.activation_timeout;
1229 bus_context_get_auth_timeout (BusContext *context)
1231 return context->limits.auth_timeout;
1235 bus_context_get_max_completed_connections (BusContext *context)
1237 return context->limits.max_completed_connections;
1241 bus_context_get_max_incomplete_connections (BusContext *context)
1243 return context->limits.max_incomplete_connections;
1247 bus_context_get_max_connections_per_user (BusContext *context)
1249 return context->limits.max_connections_per_user;
1253 bus_context_get_max_pending_activations (BusContext *context)
1255 return context->limits.max_pending_activations;
1259 bus_context_get_max_services_per_connection (BusContext *context)
1261 return context->limits.max_services_per_connection;
1265 bus_context_get_max_match_rules_per_connection (BusContext *context)
1267 return context->limits.max_match_rules_per_connection;
1271 bus_context_get_max_replies_per_connection (BusContext *context)
1273 return context->limits.max_replies_per_connection;
1277 bus_context_get_reply_timeout (BusContext *context)
1279 return context->limits.reply_timeout;
1283 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...) _DBUS_GNUC_PRINTF (3, 4);
1286 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1290 if (!context->syslog)
1292 /* we're not syslogging; just output to stderr */
1293 va_start (args, msg);
1294 vfprintf (stderr, msg, args);
1295 fprintf (stderr, "\n");
1300 va_start (args, msg);
1302 if (context->log_prefix)
1304 DBusString full_msg;
1306 if (!_dbus_string_init (&full_msg))
1308 if (!_dbus_string_append (&full_msg, context->log_prefix))
1310 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1313 _dbus_system_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1315 _dbus_string_free (&full_msg);
1318 _dbus_system_logv (severity, msg, args);
1324 static inline const char *
1325 nonnull (const char *maybe_null,
1326 const char *if_null)
1328 return (maybe_null ? maybe_null : if_null);
1332 * Log something about a message, usually that it was rejected.
1335 complain_about_message (BusContext *context,
1336 const char *error_name,
1337 const char *complaint,
1339 DBusMessage *message,
1340 DBusConnection *sender,
1341 DBusConnection *proposed_recipient,
1342 dbus_bool_t requested_reply,
1346 DBusError stack_error = DBUS_ERROR_INIT;
1347 const char *sender_name;
1348 const char *sender_loginfo;
1349 const char *proposed_recipient_loginfo;
1351 if (error == NULL && !log)
1356 sender_name = bus_connection_get_name (sender);
1357 sender_loginfo = bus_connection_get_loginfo (sender);
1361 sender_name = "(unset)";
1362 sender_loginfo = "(bus)";
1365 if (proposed_recipient != NULL)
1366 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1368 proposed_recipient_loginfo = "bus";
1370 dbus_set_error (&stack_error, error_name,
1371 "%s, %d matched rules; type=\"%s\", sender=\"%s\" (%s) "
1372 "interface=\"%s\" member=\"%s\" error name=\"%s\" "
1373 "requested_reply=\"%d\" destination=\"%s\" (%s)",
1376 dbus_message_type_to_string (dbus_message_get_type (message)),
1379 nonnull (dbus_message_get_interface (message), "(unset)"),
1380 nonnull (dbus_message_get_member (message), "(unset)"),
1381 nonnull (dbus_message_get_error_name (message), "(unset)"),
1383 nonnull (dbus_message_get_destination (message), DBUS_SERVICE_DBUS),
1384 proposed_recipient_loginfo);
1386 /* If we hit OOM while setting the error, this will syslog "out of memory"
1387 * which is itself an indication that something is seriously wrong */
1389 bus_context_log (context, DBUS_SYSTEM_LOG_SECURITY, "%s",
1390 stack_error.message);
1392 dbus_move_error (&stack_error, error);
1396 * addressed_recipient is the recipient specified in the message.
1398 * proposed_recipient is the recipient we're considering sending
1399 * to right this second, and may be an eavesdropper.
1401 * sender is the sender of the message.
1403 * NULL for proposed_recipient or sender definitely means the bus driver.
1405 * NULL for addressed_recipient may mean the bus driver, or may mean
1406 * no destination was specified in the message (e.g. a signal).
1409 bus_context_check_security_policy (BusContext *context,
1410 BusTransaction *transaction,
1411 DBusConnection *sender,
1412 DBusConnection *addressed_recipient,
1413 DBusConnection *proposed_recipient,
1414 DBusMessage *message,
1418 BusClientPolicy *sender_policy;
1419 BusClientPolicy *recipient_policy;
1420 dbus_int32_t toggles;
1423 dbus_bool_t requested_reply;
1424 const char *sender_name;
1425 const char *sender_loginfo;
1426 const char *proposed_recipient_loginfo;
1428 type = dbus_message_get_type (message);
1429 dest = dbus_message_get_destination (message);
1431 /* dispatch.c was supposed to ensure these invariants */
1432 _dbus_assert (dest != NULL ||
1433 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1434 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1435 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1436 addressed_recipient != NULL ||
1437 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1441 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1442 case DBUS_MESSAGE_TYPE_SIGNAL:
1443 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1444 case DBUS_MESSAGE_TYPE_ERROR:
1448 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1451 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1452 "Message bus will not accept messages of unknown type\n");
1457 requested_reply = FALSE;
1461 /* First verify the SELinux access controls. If allowed then
1462 * go on with the standard checks.
1464 if (!bus_selinux_allows_send (sender, proposed_recipient,
1465 dbus_message_type_to_string (dbus_message_get_type (message)),
1466 dbus_message_get_interface (message),
1467 dbus_message_get_member (message),
1468 dbus_message_get_error_name (message),
1469 dest ? dest : DBUS_SERVICE_DBUS, error))
1471 if (error != NULL && !dbus_error_is_set (error))
1473 /* don't syslog this, just set the error: avc_has_perm should
1474 * have already written to either the audit log or syslog */
1475 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1476 "An SELinux policy prevents this sender from sending this "
1477 "message to this recipient",
1478 0, message, sender, proposed_recipient, FALSE, FALSE, error);
1479 _dbus_verbose ("SELinux security check denying send to service\n");
1485 if (bus_connection_is_active (sender))
1487 sender_policy = bus_connection_get_policy (sender);
1488 _dbus_assert (sender_policy != NULL);
1490 /* Fill in requested_reply variable with TRUE if this is a
1491 * reply and the reply was pending.
1493 if (dbus_message_get_reply_serial (message) != 0)
1495 if (proposed_recipient != NULL /* not to the bus driver */ &&
1496 addressed_recipient == proposed_recipient /* not eavesdropping */)
1500 dbus_error_init (&error2);
1501 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1503 sender, addressed_recipient, message,
1505 if (dbus_error_is_set (&error2))
1507 dbus_move_error (&error2, error);
1515 /* Policy for inactive connections is that they can only send
1516 * the hello message to the bus driver
1518 if (proposed_recipient == NULL &&
1519 dbus_message_is_method_call (message,
1520 DBUS_INTERFACE_DBUS,
1523 _dbus_verbose ("security check allowing %s message\n",
1529 _dbus_verbose ("security check disallowing non-%s message\n",
1532 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1533 "Client tried to send a message other than %s without being registered",
1542 sender_policy = NULL;
1544 /* If the sender is the bus driver, we assume any reply was a
1545 * requested reply as bus driver won't send bogus ones
1547 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1548 dbus_message_get_reply_serial (message) != 0)
1549 requested_reply = TRUE;
1552 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1553 (sender == NULL && sender_policy == NULL));
1555 if (proposed_recipient != NULL)
1557 /* only the bus driver can send to an inactive recipient (as it
1558 * owns no services, so other apps can't address it). Inactive
1559 * recipients can receive any message.
1561 if (bus_connection_is_active (proposed_recipient))
1563 recipient_policy = bus_connection_get_policy (proposed_recipient);
1564 _dbus_assert (recipient_policy != NULL);
1566 else if (sender == NULL)
1568 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1569 recipient_policy = NULL;
1573 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus\n");
1574 recipient_policy = NULL;
1578 recipient_policy = NULL;
1580 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1581 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1582 (proposed_recipient == NULL && recipient_policy == NULL));
1585 if (sender_policy &&
1586 !bus_client_policy_check_can_send (sender_policy,
1590 message, &toggles, &log))
1592 const char *msg = "Rejected send message, %d matched rules; "
1593 "type=\"%s\", sender=\"%s\" (%s) interface=\"%s\" member=\"%s\" error name=\"%s\" requested_reply=%d destination=\"%s\" (%s))";
1595 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1596 "Rejected send message", toggles,
1597 message, sender, proposed_recipient, requested_reply,
1598 (addressed_recipient == proposed_recipient), error);
1599 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1605 /* We want to drop this message, and are only not doing so for backwards
1607 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1608 "Would reject message", toggles,
1609 message, sender, proposed_recipient, requested_reply,
1613 if (recipient_policy &&
1614 !bus_client_policy_check_can_receive (recipient_policy,
1618 addressed_recipient, proposed_recipient,
1621 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1622 "Rejected receive message", toggles,
1623 message, sender, proposed_recipient, requested_reply,
1624 (addressed_recipient == proposed_recipient), NULL);
1625 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1629 /* See if limits on size have been exceeded */
1630 if (proposed_recipient &&
1631 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1632 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1634 complain_about_message (context, DBUS_ERROR_LIMITS_EXCEEDED,
1635 "Rejected: destination has a full message queue",
1636 0, message, sender, proposed_recipient, requested_reply, TRUE,
1638 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1642 /* Record that we will allow a reply here in the future (don't
1643 * bother if the recipient is the bus or this is an eavesdropping
1644 * connection). Only the addressed recipient may reply.
1646 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1648 addressed_recipient &&
1649 addressed_recipient == proposed_recipient && /* not eavesdropping */
1650 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1652 sender, addressed_recipient,
1655 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1659 _dbus_verbose ("security policy allowing message\n");