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 if (!_dbus_credentials_to_string_append (credentials, &log_prefix))
378 if (!_dbus_string_append (&log_prefix, "] "))
380 _dbus_credentials_unref (credentials);
382 if (!_dbus_string_steal_data (&log_prefix, &context->log_prefix))
384 _dbus_string_free (&log_prefix);
386 /* Build an array of auth mechanisms */
388 auth_mechanisms_list = bus_config_parser_get_mechanisms (parser);
389 len = _dbus_list_get_length (auth_mechanisms_list);
395 auth_mechanisms = dbus_new0 (char*, len + 1);
396 if (auth_mechanisms == NULL)
400 link = _dbus_list_get_first_link (auth_mechanisms_list);
403 auth_mechanisms[i] = _dbus_strdup (link->data);
404 if (auth_mechanisms[i] == NULL)
406 link = _dbus_list_get_next_link (auth_mechanisms_list, link);
411 auth_mechanisms = NULL;
414 /* Listen on our addresses */
420 server = dbus_server_listen (_dbus_string_get_const_data(address), error);
423 _DBUS_ASSERT_ERROR_IS_SET (error);
426 else if (!setup_server (context, server, auth_mechanisms, error))
428 _DBUS_ASSERT_ERROR_IS_SET (error);
432 if (!_dbus_list_append (&context->servers, server))
437 addresses = bus_config_parser_get_addresses (parser);
439 link = _dbus_list_get_first_link (addresses);
444 server = dbus_server_listen (link->data, error);
447 _DBUS_ASSERT_ERROR_IS_SET (error);
450 else if (!setup_server (context, server, auth_mechanisms, error))
452 _DBUS_ASSERT_ERROR_IS_SET (error);
456 if (!_dbus_list_append (&context->servers, server))
459 link = _dbus_list_get_next_link (addresses, link);
463 context->fork = bus_config_parser_get_fork (parser);
464 context->syslog = bus_config_parser_get_syslog (parser);
465 context->keep_umask = bus_config_parser_get_keep_umask (parser);
466 context->allow_anonymous = bus_config_parser_get_allow_anonymous (parser);
468 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
472 dbus_free_string_array (auth_mechanisms);
477 dbus_free_string_array (auth_mechanisms);
481 /* This code gets executed every time the config files
482 * are parsed: both during BusContext construction
483 * and on reloads. This function is slightly screwy
484 * since it can do a "half reload" in out-of-memory
485 * situations. Realistically, unlikely to ever matter.
488 process_config_every_time (BusContext *context,
489 BusConfigParser *parser,
490 dbus_bool_t is_reload,
493 DBusString full_address;
496 BusActivation *new_activation;
498 const char *servicehelper;
503 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
508 if (!_dbus_string_init (&full_address))
514 /* get our limits and timeout lengths */
515 bus_config_parser_get_limits (parser, &context->limits);
518 bus_policy_unref (context->policy);
519 context->policy = bus_config_parser_steal_policy (parser);
520 _dbus_assert (context->policy != NULL);
522 /* We have to build the address backward, so that
523 * <listen> later in the config file have priority
525 link = _dbus_list_get_last_link (&context->servers);
528 addr = dbus_server_get_address (link->data);
535 if (_dbus_string_get_length (&full_address) > 0)
537 if (!_dbus_string_append (&full_address, ";"))
544 if (!_dbus_string_append (&full_address, addr))
553 link = _dbus_list_get_prev_link (&context->servers, link);
557 dbus_free (context->address);
559 if (!_dbus_string_copy_data (&full_address, &context->address))
565 /* get the service directories */
566 dirs = bus_config_parser_get_service_dirs (parser);
568 /* and the service helper */
569 servicehelper = bus_config_parser_get_servicehelper (parser);
571 s = _dbus_strdup(servicehelper);
572 if (s == NULL && servicehelper != NULL)
579 dbus_free(context->servicehelper);
580 context->servicehelper = s;
583 /* Create activation subsystem */
584 if (context->activation)
586 if (!bus_activation_reload (context->activation, &full_address, dirs, error))
591 context->activation = bus_activation_new (context, &full_address, dirs, error);
594 if (context->activation == NULL)
596 _DBUS_ASSERT_ERROR_IS_SET (error);
600 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
604 _dbus_string_free (&full_address);
613 list_concat_new (DBusList **a,
621 link = _dbus_list_get_first_link (a);
622 for (link = _dbus_list_get_first_link (a); link; link = _dbus_list_get_next_link (a, link))
624 if (!_dbus_list_append (result, link->data))
627 for (link = _dbus_list_get_first_link (b); link; link = _dbus_list_get_next_link (b, link))
629 if (!_dbus_list_append (result, link->data))
635 _dbus_list_clear (result);
640 process_config_postinit (BusContext *context,
641 BusConfigParser *parser,
644 DBusHashTable *service_context_table;
645 DBusList *watched_dirs = NULL;
647 service_context_table = bus_config_parser_steal_service_context_table (parser);
648 if (!bus_registry_set_service_context_table (context->registry,
649 service_context_table))
655 _dbus_hash_table_unref (service_context_table);
657 /* We need to monitor both the configuration directories and directories
658 * containing .service files.
660 if (!list_concat_new (bus_config_parser_get_conf_dirs (parser),
661 bus_config_parser_get_service_dirs (parser),
668 bus_set_watched_dirs (context, &watched_dirs);
670 _dbus_list_clear (&watched_dirs);
676 bus_context_new (const DBusString *config_file,
677 ForceForkSetting force_fork,
678 DBusPipe *print_addr_pipe,
679 DBusPipe *print_pid_pipe,
680 const DBusString *address,
681 dbus_bool_t systemd_activation,
684 DBusString log_prefix;
686 BusConfigParser *parser;
688 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
693 if (!dbus_server_allocate_data_slot (&server_data_slot))
699 context = dbus_new0 (BusContext, 1);
705 context->refcount = 1;
707 _dbus_generate_uuid (&context->uuid);
709 if (!_dbus_string_copy_data (config_file, &context->config_file))
715 context->loop = _dbus_loop_new ();
716 if (context->loop == NULL)
722 context->registry = bus_registry_new (context);
723 if (context->registry == NULL)
729 parser = bus_config_load (config_file, TRUE, NULL, error);
732 _DBUS_ASSERT_ERROR_IS_SET (error);
736 if (!process_config_first_time_only (context, parser, address, systemd_activation, error))
738 _DBUS_ASSERT_ERROR_IS_SET (error);
741 if (!process_config_every_time (context, parser, FALSE, error))
743 _DBUS_ASSERT_ERROR_IS_SET (error);
747 /* we need another ref of the server data slot for the context
750 if (!dbus_server_allocate_data_slot (&server_data_slot))
751 _dbus_assert_not_reached ("second ref of server data slot failed");
753 /* Note that we don't know whether the print_addr_pipe is
754 * one of the sockets we're using to listen on, or some
755 * other random thing. But I think the answer is "don't do
758 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
761 const char *a = bus_context_get_address (context);
764 _dbus_assert (a != NULL);
765 if (!_dbus_string_init (&addr))
771 if (!_dbus_string_append (&addr, a) ||
772 !_dbus_string_append (&addr, "\n"))
774 _dbus_string_free (&addr);
779 bytes = _dbus_string_get_length (&addr);
780 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
782 /* pipe write returns an error on failure but not short write */
783 if (error != NULL && !dbus_error_is_set (error))
785 dbus_set_error (error, DBUS_ERROR_FAILED,
786 "Printing message bus address: did not write all bytes\n");
788 _dbus_string_free (&addr);
792 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
793 _dbus_pipe_close (print_addr_pipe, NULL);
795 _dbus_string_free (&addr);
798 context->connections = bus_connections_new (context);
799 if (context->connections == NULL)
805 context->matchmaker = bus_matchmaker_new ();
806 if (context->matchmaker == NULL)
812 /* check user before we fork */
813 if (context->user != NULL)
815 if (!_dbus_verify_daemon_user (context->user))
817 dbus_set_error (error, DBUS_ERROR_FAILED,
818 "Could not get UID and GID for username \"%s\"",
824 /* Now become a daemon if appropriate and write out pid file in any case */
828 if (context->pidfile)
829 _dbus_string_init_const (&u, context->pidfile);
831 if ((force_fork != FORK_NEVER && context->fork) || force_fork == FORK_ALWAYS)
833 _dbus_verbose ("Forking and becoming daemon\n");
835 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
838 context->keep_umask))
840 _DBUS_ASSERT_ERROR_IS_SET (error);
846 _dbus_verbose ("Fork not requested\n");
848 /* Need to write PID file and to PID pipe for ourselves,
849 * not for the child process. This is a no-op if the pidfile
850 * is NULL and print_pid_pipe is NULL.
852 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
857 _DBUS_ASSERT_ERROR_IS_SET (error);
863 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
864 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
865 _dbus_pipe_close (print_pid_pipe, NULL);
867 if (!bus_selinux_full_init ())
869 bus_context_log (context, DBUS_SYSTEM_LOG_FATAL, "SELinux enabled but AVC initialization failed; check system log\n");
872 if (!process_config_postinit (context, parser, error))
874 _DBUS_ASSERT_ERROR_IS_SET (error);
880 bus_config_parser_unref (parser);
884 /* Here we change our credentials if required,
885 * as soon as we've set up our sockets and pidfile
887 if (context->user != NULL)
889 if (!_dbus_change_to_daemon_user (context->user, error))
891 _DBUS_ASSERT_ERROR_IS_SET (error);
896 /* FIXME - why not just put this in full_init() below? */
897 bus_selinux_audit_init ();
901 dbus_server_free_data_slot (&server_data_slot);
907 bus_config_parser_unref (parser);
909 bus_context_unref (context);
911 if (server_data_slot >= 0)
912 dbus_server_free_data_slot (&server_data_slot);
918 bus_context_get_id (BusContext *context,
921 return _dbus_uuid_encode (&context->uuid, uuid);
925 bus_context_reload_config (BusContext *context,
928 BusConfigParser *parser;
929 DBusString config_file;
932 /* Flush the user database cache */
933 _dbus_flush_caches ();
936 _dbus_string_init_const (&config_file, context->config_file);
937 parser = bus_config_load (&config_file, TRUE, NULL, error);
940 _DBUS_ASSERT_ERROR_IS_SET (error);
944 if (!process_config_every_time (context, parser, TRUE, error))
946 _DBUS_ASSERT_ERROR_IS_SET (error);
949 if (!process_config_postinit (context, parser, error))
951 _DBUS_ASSERT_ERROR_IS_SET (error);
956 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
959 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
961 bus_config_parser_unref (parser);
966 shutdown_server (BusContext *context,
969 if (server == NULL ||
970 !dbus_server_get_is_connected (server))
973 if (!dbus_server_set_watch_functions (server,
977 _dbus_assert_not_reached ("setting watch functions to NULL failed");
979 if (!dbus_server_set_timeout_functions (server,
983 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
985 dbus_server_disconnect (server);
989 bus_context_shutdown (BusContext *context)
993 link = _dbus_list_get_first_link (&context->servers);
996 shutdown_server (context, link->data);
998 link = _dbus_list_get_next_link (&context->servers, link);
1003 bus_context_ref (BusContext *context)
1005 _dbus_assert (context->refcount > 0);
1006 context->refcount += 1;
1012 bus_context_unref (BusContext *context)
1014 _dbus_assert (context->refcount > 0);
1015 context->refcount -= 1;
1017 if (context->refcount == 0)
1021 _dbus_verbose ("Finalizing bus context %p\n", context);
1023 bus_context_shutdown (context);
1025 if (context->connections)
1027 bus_connections_unref (context->connections);
1028 context->connections = NULL;
1031 if (context->registry)
1033 bus_registry_unref (context->registry);
1034 context->registry = NULL;
1037 if (context->activation)
1039 bus_activation_unref (context->activation);
1040 context->activation = NULL;
1043 link = _dbus_list_get_first_link (&context->servers);
1044 while (link != NULL)
1046 dbus_server_unref (link->data);
1048 link = _dbus_list_get_next_link (&context->servers, link);
1050 _dbus_list_clear (&context->servers);
1052 if (context->policy)
1054 bus_policy_unref (context->policy);
1055 context->policy = NULL;
1060 _dbus_loop_unref (context->loop);
1061 context->loop = NULL;
1064 if (context->matchmaker)
1066 bus_matchmaker_unref (context->matchmaker);
1067 context->matchmaker = NULL;
1070 dbus_free (context->config_file);
1071 dbus_free (context->log_prefix);
1072 dbus_free (context->type);
1073 dbus_free (context->address);
1074 dbus_free (context->user);
1075 dbus_free (context->servicehelper);
1077 if (context->pidfile)
1080 _dbus_string_init_const (&u, context->pidfile);
1082 /* Deliberately ignore errors here, since there's not much
1083 * we can do about it, and we're exiting anyways.
1085 _dbus_delete_file (&u, NULL);
1087 dbus_free (context->pidfile);
1089 dbus_free (context);
1091 dbus_server_free_data_slot (&server_data_slot);
1095 /* type may be NULL */
1097 bus_context_get_type (BusContext *context)
1099 return context->type;
1103 bus_context_get_address (BusContext *context)
1105 return context->address;
1109 bus_context_get_servicehelper (BusContext *context)
1111 return context->servicehelper;
1115 bus_context_get_systemd_activation (BusContext *context)
1117 return context->systemd_activation;
1121 bus_context_get_registry (BusContext *context)
1123 return context->registry;
1127 bus_context_get_connections (BusContext *context)
1129 return context->connections;
1133 bus_context_get_activation (BusContext *context)
1135 return context->activation;
1139 bus_context_get_matchmaker (BusContext *context)
1141 return context->matchmaker;
1145 bus_context_get_loop (BusContext *context)
1147 return context->loop;
1151 bus_context_allow_unix_user (BusContext *context,
1154 return bus_policy_allow_unix_user (context->policy,
1158 /* For now this is never actually called because the default
1159 * DBusConnection behavior of 'same user that owns the bus can connect'
1160 * is all it would do.
1163 bus_context_allow_windows_user (BusContext *context,
1164 const char *windows_sid)
1166 return bus_policy_allow_windows_user (context->policy,
1171 bus_context_get_policy (BusContext *context)
1173 return context->policy;
1177 bus_context_create_client_policy (BusContext *context,
1178 DBusConnection *connection,
1181 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1182 return bus_policy_create_client_policy (context->policy, connection,
1187 bus_context_get_activation_timeout (BusContext *context)
1190 return context->limits.activation_timeout;
1194 bus_context_get_auth_timeout (BusContext *context)
1196 return context->limits.auth_timeout;
1200 bus_context_get_max_completed_connections (BusContext *context)
1202 return context->limits.max_completed_connections;
1206 bus_context_get_max_incomplete_connections (BusContext *context)
1208 return context->limits.max_incomplete_connections;
1212 bus_context_get_max_connections_per_user (BusContext *context)
1214 return context->limits.max_connections_per_user;
1218 bus_context_get_max_pending_activations (BusContext *context)
1220 return context->limits.max_pending_activations;
1224 bus_context_get_max_services_per_connection (BusContext *context)
1226 return context->limits.max_services_per_connection;
1230 bus_context_get_max_match_rules_per_connection (BusContext *context)
1232 return context->limits.max_match_rules_per_connection;
1236 bus_context_get_max_replies_per_connection (BusContext *context)
1238 return context->limits.max_replies_per_connection;
1242 bus_context_get_reply_timeout (BusContext *context)
1244 return context->limits.reply_timeout;
1248 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...) _DBUS_GNUC_PRINTF (3, 4);
1251 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1255 if (!context->syslog)
1258 va_start (args, msg);
1260 if (context->log_prefix)
1262 DBusString full_msg;
1264 if (!_dbus_string_init (&full_msg))
1266 if (!_dbus_string_append (&full_msg, context->log_prefix))
1268 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1271 _dbus_system_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1273 _dbus_string_free (&full_msg);
1276 _dbus_system_logv (severity, msg, args);
1283 * addressed_recipient is the recipient specified in the message.
1285 * proposed_recipient is the recipient we're considering sending
1286 * to right this second, and may be an eavesdropper.
1288 * sender is the sender of the message.
1290 * NULL for proposed_recipient or sender definitely means the bus driver.
1292 * NULL for addressed_recipient may mean the bus driver, or may mean
1293 * no destination was specified in the message (e.g. a signal).
1296 bus_context_check_security_policy (BusContext *context,
1297 BusTransaction *transaction,
1298 DBusConnection *sender,
1299 DBusConnection *addressed_recipient,
1300 DBusConnection *proposed_recipient,
1301 DBusMessage *message,
1305 BusClientPolicy *sender_policy;
1306 BusClientPolicy *recipient_policy;
1307 dbus_int32_t toggles;
1310 dbus_bool_t requested_reply;
1311 const char *sender_name;
1312 const char *sender_loginfo;
1313 const char *proposed_recipient_loginfo;
1315 type = dbus_message_get_type (message);
1316 dest = dbus_message_get_destination (message);
1318 /* dispatch.c was supposed to ensure these invariants */
1319 _dbus_assert (dest != NULL ||
1320 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1321 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1322 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1323 addressed_recipient != NULL ||
1324 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1326 /* Used in logging below */
1329 sender_name = bus_connection_get_name (sender);
1330 sender_loginfo = bus_connection_get_loginfo (sender);
1335 sender_loginfo = "(bus)";
1338 if (proposed_recipient != NULL)
1339 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1341 proposed_recipient_loginfo = "bus";
1345 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1346 case DBUS_MESSAGE_TYPE_SIGNAL:
1347 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1348 case DBUS_MESSAGE_TYPE_ERROR:
1352 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1355 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1356 "Message bus will not accept messages of unknown type\n");
1361 requested_reply = FALSE;
1365 /* First verify the SELinux access controls. If allowed then
1366 * go on with the standard checks.
1368 if (!bus_selinux_allows_send (sender, proposed_recipient,
1369 dbus_message_type_to_string (dbus_message_get_type (message)),
1370 dbus_message_get_interface (message),
1371 dbus_message_get_member (message),
1372 dbus_message_get_error_name (message),
1373 dest ? dest : DBUS_SERVICE_DBUS, error))
1375 if (error != NULL && !dbus_error_is_set (error))
1377 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1378 "An SELinux policy prevents this sender "
1379 "from sending this message to this recipient "
1380 "(rejected message had sender \"%s\" interface \"%s\" "
1381 "member \"%s\" error name \"%s\" destination \"%s\")",
1382 sender_name ? sender_name : "(unset)",
1383 dbus_message_get_interface (message) ?
1384 dbus_message_get_interface (message) : "(unset)",
1385 dbus_message_get_member (message) ?
1386 dbus_message_get_member (message) : "(unset)",
1387 dbus_message_get_error_name (message) ?
1388 dbus_message_get_error_name (message) : "(unset)",
1389 dest ? dest : DBUS_SERVICE_DBUS);
1390 _dbus_verbose ("SELinux security check denying send to service\n");
1396 if (bus_connection_is_active (sender))
1398 sender_policy = bus_connection_get_policy (sender);
1399 _dbus_assert (sender_policy != NULL);
1401 /* Fill in requested_reply variable with TRUE if this is a
1402 * reply and the reply was pending.
1404 if (dbus_message_get_reply_serial (message) != 0)
1406 if (proposed_recipient != NULL /* not to the bus driver */ &&
1407 addressed_recipient == proposed_recipient /* not eavesdropping */)
1411 dbus_error_init (&error2);
1412 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1414 sender, addressed_recipient, message,
1416 if (dbus_error_is_set (&error2))
1418 dbus_move_error (&error2, error);
1426 /* Policy for inactive connections is that they can only send
1427 * the hello message to the bus driver
1429 if (proposed_recipient == NULL &&
1430 dbus_message_is_method_call (message,
1431 DBUS_INTERFACE_DBUS,
1434 _dbus_verbose ("security check allowing %s message\n",
1440 _dbus_verbose ("security check disallowing non-%s message\n",
1443 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1444 "Client tried to send a message other than %s without being registered",
1453 sender_policy = NULL;
1455 /* If the sender is the bus driver, we assume any reply was a
1456 * requested reply as bus driver won't send bogus ones
1458 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1459 dbus_message_get_reply_serial (message) != 0)
1460 requested_reply = TRUE;
1463 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1464 (sender == NULL && sender_policy == NULL));
1466 if (proposed_recipient != NULL)
1468 /* only the bus driver can send to an inactive recipient (as it
1469 * owns no services, so other apps can't address it). Inactive
1470 * recipients can receive any message.
1472 if (bus_connection_is_active (proposed_recipient))
1474 recipient_policy = bus_connection_get_policy (proposed_recipient);
1475 _dbus_assert (recipient_policy != NULL);
1477 else if (sender == NULL)
1479 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1480 recipient_policy = NULL;
1484 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus\n");
1485 recipient_policy = NULL;
1489 recipient_policy = NULL;
1491 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1492 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1493 (proposed_recipient == NULL && recipient_policy == NULL));
1496 if (sender_policy &&
1497 !bus_client_policy_check_can_send (sender_policy,
1501 message, &toggles, &log))
1503 const char *msg = "Rejected send message, %d matched rules; "
1504 "type=\"%s\", sender=\"%s\" (%s) interface=\"%s\" member=\"%s\" error name=\"%s\" requested_reply=%d destination=\"%s\" (%s))";
1506 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED, msg,
1508 dbus_message_type_to_string (dbus_message_get_type (message)),
1509 sender_name ? sender_name : "(unset)",
1511 dbus_message_get_interface (message) ?
1512 dbus_message_get_interface (message) : "(unset)",
1513 dbus_message_get_member (message) ?
1514 dbus_message_get_member (message) : "(unset)",
1515 dbus_message_get_error_name (message) ?
1516 dbus_message_get_error_name (message) : "(unset)",
1518 dest ? dest : DBUS_SERVICE_DBUS,
1519 proposed_recipient_loginfo);
1520 /* Needs to be duplicated to avoid calling malloc and having to handle OOM */
1521 if (addressed_recipient == proposed_recipient)
1522 bus_context_log (context, DBUS_SYSTEM_LOG_SECURITY, msg,
1524 dbus_message_type_to_string (dbus_message_get_type (message)),
1525 sender_name ? sender_name : "(unset)",
1527 dbus_message_get_interface (message) ?
1528 dbus_message_get_interface (message) : "(unset)",
1529 dbus_message_get_member (message) ?
1530 dbus_message_get_member (message) : "(unset)",
1531 dbus_message_get_error_name (message) ?
1532 dbus_message_get_error_name (message) : "(unset)",
1534 dest ? dest : DBUS_SERVICE_DBUS,
1535 proposed_recipient_loginfo);
1536 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1541 bus_context_log (context, DBUS_SYSTEM_LOG_SECURITY,
1542 "Would reject message, %d matched rules; "
1543 "type=\"%s\", sender=\"%s\" (%s) interface=\"%s\" member=\"%s\" error name=\"%s\" requested_reply=%d destination=\"%s\" (%s))",
1545 dbus_message_type_to_string (dbus_message_get_type (message)),
1546 sender_name ? sender_name : "(unset)",
1548 dbus_message_get_interface (message) ?
1549 dbus_message_get_interface (message) : "(unset)",
1550 dbus_message_get_member (message) ?
1551 dbus_message_get_member (message) : "(unset)",
1552 dbus_message_get_error_name (message) ?
1553 dbus_message_get_error_name (message) : "(unset)",
1555 dest ? dest : DBUS_SERVICE_DBUS,
1556 proposed_recipient_loginfo);
1558 if (recipient_policy &&
1559 !bus_client_policy_check_can_receive (recipient_policy,
1563 addressed_recipient, proposed_recipient,
1566 const char *msg = "Rejected receive message, %d matched rules; "
1567 "type=\"%s\" sender=\"%s\" (%s) interface=\"%s\" member=\"%s\" error name=\"%s\" reply serial=%u requested_reply=%d destination=\"%s\" (%s))";
1569 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED, msg,
1571 dbus_message_type_to_string (dbus_message_get_type (message)),
1572 sender_name ? sender_name : "(unset)",
1574 dbus_message_get_interface (message) ?
1575 dbus_message_get_interface (message) : "(unset)",
1576 dbus_message_get_member (message) ?
1577 dbus_message_get_member (message) : "(unset)",
1578 dbus_message_get_error_name (message) ?
1579 dbus_message_get_error_name (message) : "(unset)",
1580 dbus_message_get_reply_serial (message),
1582 dest ? dest : DBUS_SERVICE_DBUS,
1583 proposed_recipient_loginfo);
1584 /* Needs to be duplicated to avoid calling malloc and having to handle OOM */
1585 if (addressed_recipient == proposed_recipient)
1586 bus_context_log (context, DBUS_SYSTEM_LOG_SECURITY, msg,
1588 dbus_message_type_to_string (dbus_message_get_type (message)),
1589 sender_name ? sender_name : "(unset)",
1591 dbus_message_get_interface (message) ?
1592 dbus_message_get_interface (message) : "(unset)",
1593 dbus_message_get_member (message) ?
1594 dbus_message_get_member (message) : "(unset)",
1595 dbus_message_get_error_name (message) ?
1596 dbus_message_get_error_name (message) : "(unset)",
1597 dbus_message_get_reply_serial (message),
1599 dest ? dest : DBUS_SERVICE_DBUS,
1600 proposed_recipient_loginfo);
1601 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1605 /* See if limits on size have been exceeded */
1606 if (proposed_recipient &&
1607 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1608 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1610 dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1611 "The destination service \"%s\" has a full message queue",
1612 dest ? dest : (proposed_recipient ?
1613 bus_connection_get_name (proposed_recipient) :
1614 DBUS_SERVICE_DBUS));
1615 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1619 /* Record that we will allow a reply here in the future (don't
1620 * bother if the recipient is the bus or this is an eavesdropping
1621 * connection). Only the addressed recipient may reply.
1623 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1625 addressed_recipient &&
1626 addressed_recipient == proposed_recipient && /* not eavesdropping */
1627 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1629 sender, addressed_recipient,
1632 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1636 _dbus_verbose ("security policy allowing message\n");