1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* bus.c message bus context object
4 * Copyright (C) 2003, 2004 Red Hat, Inc.
6 * Licensed under the Academic Free License version 2.1
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 #include "activation.h"
31 #include "connection.h"
35 #include "config-parser.h"
40 #include "dir-watch.h"
41 #include <dbus/dbus-auth.h>
42 #include <dbus/dbus-list.h>
43 #include <dbus/dbus-hash.h>
44 #include <dbus/dbus-credentials.h>
45 #include <dbus/dbus-internals.h>
46 #include <dbus/dbus-server-protected.h>
65 BusConnections *connections;
66 BusActivation *activation;
67 BusRegistry *registry;
69 BusMatchmaker *matchmaker;
71 DBusRLimit *initial_fd_limit;
72 unsigned int fork : 1;
73 unsigned int syslog : 1;
74 unsigned int keep_umask : 1;
75 unsigned int allow_anonymous : 1;
76 unsigned int systemd_activation : 1;
77 dbus_bool_t watches_enabled;
80 static dbus_int32_t server_data_slot = -1;
87 #define BUS_SERVER_DATA(server) (dbus_server_get_data ((server), server_data_slot))
90 server_get_context (DBusServer *server)
95 /* this data slot was allocated by the BusContext */
96 _dbus_assert (server_data_slot >= 0);
98 bd = BUS_SERVER_DATA (server);
100 /* every DBusServer in the dbus-daemon has gone through setup_server() */
101 _dbus_assert (bd != NULL);
103 context = bd->context;
109 add_server_watch (DBusWatch *watch,
112 DBusServer *server = data;
115 context = server_get_context (server);
117 return _dbus_loop_add_watch (context->loop, watch);
121 remove_server_watch (DBusWatch *watch,
124 DBusServer *server = data;
127 context = server_get_context (server);
129 _dbus_loop_remove_watch (context->loop, watch);
133 toggle_server_watch (DBusWatch *watch,
136 DBusServer *server = data;
139 context = server_get_context (server);
141 _dbus_loop_toggle_watch (context->loop, watch);
145 add_server_timeout (DBusTimeout *timeout,
148 DBusServer *server = data;
151 context = server_get_context (server);
153 return _dbus_loop_add_timeout (context->loop, timeout);
157 remove_server_timeout (DBusTimeout *timeout,
160 DBusServer *server = data;
163 context = server_get_context (server);
165 _dbus_loop_remove_timeout (context->loop, timeout);
169 new_connection_callback (DBusServer *server,
170 DBusConnection *new_connection,
173 BusContext *context = data;
175 if (!bus_connections_setup_connection (context->connections, new_connection))
177 _dbus_verbose ("No memory to setup new connection\n");
179 /* if we don't do this, it will get unref'd without
180 * being disconnected... kind of strange really
181 * that we have to do this, people won't get it right
184 dbus_connection_close (new_connection);
187 dbus_connection_set_max_received_size (new_connection,
188 context->limits.max_incoming_bytes);
190 dbus_connection_set_max_message_size (new_connection,
191 context->limits.max_message_size);
193 dbus_connection_set_max_received_unix_fds (new_connection,
194 context->limits.max_incoming_unix_fds);
196 dbus_connection_set_max_message_unix_fds (new_connection,
197 context->limits.max_message_unix_fds);
199 dbus_connection_set_allow_anonymous (new_connection,
200 context->allow_anonymous);
202 /* on OOM, we won't have ref'd the connection so it will die. */
206 free_server_data (void *data)
208 BusServerData *bd = data;
214 setup_server (BusContext *context,
216 char **auth_mechanisms,
221 bd = dbus_new0 (BusServerData, 1);
222 if (bd == NULL || !dbus_server_set_data (server,
224 bd, free_server_data))
231 bd->context = context;
233 if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms))
239 dbus_server_set_new_connection_function (server,
240 new_connection_callback,
243 if (!dbus_server_set_watch_functions (server,
254 if (!dbus_server_set_timeout_functions (server,
256 remove_server_timeout,
267 /* This code only gets executed the first time the
268 * config files are parsed. It is not executed
269 * when config files are reloaded.
272 process_config_first_time_only (BusContext *context,
273 BusConfigParser *parser,
274 const DBusString *address,
275 BusContextFlags flags,
278 DBusString log_prefix;
280 DBusList **addresses;
281 const char *user, *pidfile;
282 char **auth_mechanisms;
283 DBusList **auth_mechanisms_list;
286 DBusLogFlags log_flags = DBUS_LOG_FLAGS_STDERR;
288 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
291 auth_mechanisms = NULL;
294 if (flags & BUS_CONTEXT_FLAG_SYSLOG_ALWAYS)
296 context->syslog = TRUE;
297 log_flags |= DBUS_LOG_FLAGS_SYSTEM_LOG;
299 if (flags & BUS_CONTEXT_FLAG_SYSLOG_ONLY)
300 log_flags &= ~DBUS_LOG_FLAGS_STDERR;
302 else if (flags & BUS_CONTEXT_FLAG_SYSLOG_NEVER)
304 context->syslog = FALSE;
308 context->syslog = bus_config_parser_get_syslog (parser);
311 log_flags |= DBUS_LOG_FLAGS_SYSTEM_LOG;
314 _dbus_init_system_log ("dbus-daemon", log_flags);
316 if (flags & BUS_CONTEXT_FLAG_SYSTEMD_ACTIVATION)
317 context->systemd_activation = TRUE;
319 context->systemd_activation = FALSE;
321 /* Check for an existing pid file. Of course this is a race;
322 * we'd have to use fcntl() locks on the pid file to
323 * avoid that. But we want to check for the pid file
324 * before overwriting any existing sockets, etc.
327 if (flags & BUS_CONTEXT_FLAG_WRITE_PID_FILE)
328 pidfile = bus_config_parser_get_pidfile (parser);
335 _dbus_string_init_const (&u, pidfile);
337 if (_dbus_stat (&u, &stbuf, NULL))
343 _dbus_string_init (&p);
344 _dbus_file_get_contents(&p, &u, NULL);
345 _dbus_string_parse_int(&p, 0, &pid, NULL);
346 _dbus_string_free(&p);
348 if ((kill((int)pid, 0))) {
349 dbus_set_error(NULL, DBUS_ERROR_FILE_EXISTS,
350 "pid %ld not running, removing stale pid file\n",
352 _dbus_delete_file(&u, NULL);
355 dbus_set_error (error, DBUS_ERROR_FAILED,
356 "The pid file \"%s\" exists, if the message bus is not running, remove this file",
365 /* keep around the pid filename so we can delete it later */
366 context->pidfile = _dbus_strdup (pidfile);
368 /* note that type may be NULL */
369 context->type = _dbus_strdup (bus_config_parser_get_type (parser));
370 if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
373 user = bus_config_parser_get_user (parser);
376 context->user = _dbus_strdup (user);
377 if (context->user == NULL)
381 /* Set up the prefix for syslog messages */
382 if (!_dbus_string_init (&log_prefix))
384 if (context->type && !strcmp (context->type, "system"))
386 if (!_dbus_string_append (&log_prefix, "[system] "))
389 else if (context->type && !strcmp (context->type, "session"))
391 DBusCredentials *credentials;
393 credentials = _dbus_credentials_new_from_current_process ();
396 if (!_dbus_string_append (&log_prefix, "[session "))
398 _dbus_credentials_unref (credentials);
401 if (!_dbus_credentials_to_string_append (credentials, &log_prefix))
403 _dbus_credentials_unref (credentials);
406 if (!_dbus_string_append (&log_prefix, "] "))
408 _dbus_credentials_unref (credentials);
411 _dbus_credentials_unref (credentials);
413 if (!_dbus_string_steal_data (&log_prefix, &context->log_prefix))
415 _dbus_string_free (&log_prefix);
417 /* Build an array of auth mechanisms */
419 auth_mechanisms_list = bus_config_parser_get_mechanisms (parser);
420 len = _dbus_list_get_length (auth_mechanisms_list);
426 auth_mechanisms = dbus_new0 (char*, len + 1);
427 if (auth_mechanisms == NULL)
431 link = _dbus_list_get_first_link (auth_mechanisms_list);
435 _dbus_string_init_const (&name, link->data);
436 if (!_dbus_auth_is_supported_mechanism (&name))
439 if (!_dbus_string_init (&list))
442 if (!_dbus_auth_dump_supported_mechanisms (&list))
444 _dbus_string_free (&list);
447 dbus_set_error (error, DBUS_ERROR_FAILED,
448 "Unsupported auth mechanism \"%s\" in bus config file detected. Supported mechanisms are \"%s\".",
450 _dbus_string_get_const_data (&list));
451 _dbus_string_free (&list);
454 auth_mechanisms[i] = _dbus_strdup (link->data);
455 if (auth_mechanisms[i] == NULL)
457 link = _dbus_list_get_next_link (auth_mechanisms_list, link);
463 auth_mechanisms = NULL;
466 /* Listen on our addresses */
472 server = dbus_server_listen (_dbus_string_get_const_data(address), error);
475 _DBUS_ASSERT_ERROR_IS_SET (error);
478 else if (!setup_server (context, server, auth_mechanisms, error))
480 _DBUS_ASSERT_ERROR_IS_SET (error);
484 if (!_dbus_list_append (&context->servers, server))
489 addresses = bus_config_parser_get_addresses (parser);
491 link = _dbus_list_get_first_link (addresses);
496 server = dbus_server_listen (link->data, error);
499 _DBUS_ASSERT_ERROR_IS_SET (error);
502 else if (!setup_server (context, server, auth_mechanisms, error))
504 _DBUS_ASSERT_ERROR_IS_SET (error);
508 if (!_dbus_list_append (&context->servers, server))
511 link = _dbus_list_get_next_link (addresses, link);
515 context->fork = bus_config_parser_get_fork (parser);
516 context->keep_umask = bus_config_parser_get_keep_umask (parser);
517 context->allow_anonymous = bus_config_parser_get_allow_anonymous (parser);
519 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
523 dbus_free_string_array (auth_mechanisms);
528 dbus_free_string_array (auth_mechanisms);
532 /* This code gets executed every time the config files
533 * are parsed: both during BusContext construction
534 * and on reloads. This function is slightly screwy
535 * since it can do a "half reload" in out-of-memory
536 * situations. Realistically, unlikely to ever matter.
539 process_config_every_time (BusContext *context,
540 BusConfigParser *parser,
541 dbus_bool_t is_reload,
544 DBusString full_address;
548 const char *servicehelper;
553 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
558 if (!_dbus_string_init (&full_address))
564 /* get our limits and timeout lengths */
565 bus_config_parser_get_limits (parser, &context->limits);
568 bus_policy_unref (context->policy);
569 context->policy = bus_config_parser_steal_policy (parser);
570 _dbus_assert (context->policy != NULL);
572 /* context->connections is NULL when creating new BusContext */
573 if (context->connections)
575 _dbus_verbose ("Reload policy rules for completed connections\n");
576 retval = bus_connections_reload_policy (context->connections, error);
579 _DBUS_ASSERT_ERROR_IS_SET (error);
584 /* We have to build the address backward, so that
585 * <listen> later in the config file have priority
587 link = _dbus_list_get_last_link (&context->servers);
590 addr = dbus_server_get_address (link->data);
597 if (_dbus_string_get_length (&full_address) > 0)
599 if (!_dbus_string_append (&full_address, ";"))
606 if (!_dbus_string_append (&full_address, addr))
615 link = _dbus_list_get_prev_link (&context->servers, link);
619 dbus_free (context->address);
621 if (!_dbus_string_copy_data (&full_address, &context->address))
627 /* get the service directories */
628 dirs = bus_config_parser_get_service_dirs (parser);
630 /* and the service helper */
631 servicehelper = bus_config_parser_get_servicehelper (parser);
633 s = _dbus_strdup(servicehelper);
634 if (s == NULL && servicehelper != NULL)
641 dbus_free(context->servicehelper);
642 context->servicehelper = s;
645 /* Create activation subsystem */
646 if (context->activation)
648 if (!bus_activation_reload (context->activation, &full_address, dirs, error))
653 context->activation = bus_activation_new (context, &full_address, dirs, error);
656 if (context->activation == NULL)
658 _DBUS_ASSERT_ERROR_IS_SET (error);
662 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
666 _dbus_string_free (&full_address);
675 raise_file_descriptor_limit (BusContext *context)
678 DBusError error = DBUS_ERROR_INIT;
680 /* we only do this once */
681 if (context->initial_fd_limit != NULL)
684 context->initial_fd_limit = _dbus_rlimit_save_fd_limit (&error);
686 if (context->initial_fd_limit == NULL)
688 bus_context_log (context, DBUS_SYSTEM_LOG_WARNING,
689 "%s: %s", error.name, error.message);
690 dbus_error_free (&error);
694 /* We used to compute a suitable rlimit based on the configured number
695 * of connections, but that breaks down as soon as we allow fd-passing,
696 * because each connection is allowed to pass 64 fds to us, and if
697 * they all did, we'd hit kernel limits. We now hard-code 64k as a
698 * good limit, like systemd does: that's enough to avoid DoS from
699 * anything short of multiple uids conspiring against us.
701 if (!_dbus_rlimit_raise_fd_limit_if_privileged (65536, &error))
703 bus_context_log (context, DBUS_SYSTEM_LOG_WARNING,
704 "%s: %s", error.name, error.message);
705 dbus_error_free (&error);
712 process_config_postinit (BusContext *context,
713 BusConfigParser *parser,
716 DBusHashTable *service_context_table;
717 DBusList *watched_dirs = NULL;
719 raise_file_descriptor_limit (context);
721 service_context_table = bus_config_parser_steal_service_context_table (parser);
722 if (!bus_registry_set_service_context_table (context->registry,
723 service_context_table))
729 _dbus_hash_table_unref (service_context_table);
731 /* We need to monitor both the configuration directories and directories
732 * containing .service files.
734 if (!bus_config_parser_get_watched_dirs (parser, &watched_dirs))
740 bus_set_watched_dirs (context, &watched_dirs);
742 _dbus_list_clear (&watched_dirs);
748 bus_context_new (const DBusString *config_file,
749 BusContextFlags flags,
750 DBusPipe *print_addr_pipe,
751 DBusPipe *print_pid_pipe,
752 const DBusString *address,
756 BusConfigParser *parser;
758 _dbus_assert ((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 ||
759 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS) == 0);
761 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
766 if (!dbus_server_allocate_data_slot (&server_data_slot))
772 context = dbus_new0 (BusContext, 1);
778 context->refcount = 1;
780 if (!_dbus_generate_uuid (&context->uuid, error))
783 if (!_dbus_string_copy_data (config_file, &context->config_file))
789 context->loop = _dbus_loop_new ();
790 if (context->loop == NULL)
796 context->watches_enabled = TRUE;
798 context->registry = bus_registry_new (context);
799 if (context->registry == NULL)
805 parser = bus_config_load (config_file, TRUE, NULL, error);
808 _DBUS_ASSERT_ERROR_IS_SET (error);
812 if (!process_config_first_time_only (context, parser, address, flags, error))
814 _DBUS_ASSERT_ERROR_IS_SET (error);
817 if (!process_config_every_time (context, parser, FALSE, error))
819 _DBUS_ASSERT_ERROR_IS_SET (error);
823 /* we need another ref of the server data slot for the context
826 if (!dbus_server_allocate_data_slot (&server_data_slot))
827 _dbus_assert_not_reached ("second ref of server data slot failed");
829 /* Note that we don't know whether the print_addr_pipe is
830 * one of the sockets we're using to listen on, or some
831 * other random thing. But I think the answer is "don't do
834 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
837 const char *a = bus_context_get_address (context);
840 _dbus_assert (a != NULL);
841 if (!_dbus_string_init (&addr))
847 if (!_dbus_string_append (&addr, a) ||
848 !_dbus_string_append (&addr, "\n"))
850 _dbus_string_free (&addr);
855 bytes = _dbus_string_get_length (&addr);
856 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
858 /* pipe write returns an error on failure but not short write */
859 if (error != NULL && !dbus_error_is_set (error))
861 dbus_set_error (error, DBUS_ERROR_FAILED,
862 "Printing message bus address: did not write all bytes\n");
864 _dbus_string_free (&addr);
868 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
869 _dbus_pipe_close (print_addr_pipe, NULL);
871 _dbus_string_free (&addr);
874 context->connections = bus_connections_new (context);
875 if (context->connections == NULL)
881 context->matchmaker = bus_matchmaker_new ();
882 if (context->matchmaker == NULL)
888 /* check user before we fork */
889 if (context->user != NULL)
891 if (!_dbus_verify_daemon_user (context->user))
893 dbus_set_error (error, DBUS_ERROR_FAILED,
894 "Could not get UID and GID for username \"%s\"",
900 /* Now become a daemon if appropriate and write out pid file in any case */
904 if (context->pidfile)
905 _dbus_string_init_const (&u, context->pidfile);
907 if (((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 && context->fork) ||
908 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS))
910 _dbus_verbose ("Forking and becoming daemon\n");
912 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
915 context->keep_umask))
917 _DBUS_ASSERT_ERROR_IS_SET (error);
923 _dbus_verbose ("Fork not requested\n");
925 /* Need to write PID file and to PID pipe for ourselves,
926 * not for the child process. This is a no-op if the pidfile
927 * is NULL and print_pid_pipe is NULL.
929 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
934 _DBUS_ASSERT_ERROR_IS_SET (error);
940 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
941 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
942 _dbus_pipe_close (print_pid_pipe, NULL);
944 /* Here we change our credentials if required,
945 * as soon as we've set up our sockets and pidfile.
946 * This must be done before initializing LSMs, so that the netlink
947 * monitoring thread started by avc_init() will not lose CAP_AUDIT_WRITE
948 * when the main thread calls setuid().
949 * https://bugs.freedesktop.org/show_bug.cgi?id=92832
951 if (context->user != NULL)
953 if (!_dbus_change_to_daemon_user (context->user, error))
955 _DBUS_ASSERT_ERROR_IS_SET (error);
960 /* Auditing should be initialized before LSMs, so that the LSMs are able
961 * to log audit-events that happen during their initialization.
963 bus_audit_init (context);
965 if (!bus_selinux_full_init ())
967 bus_context_log (context, DBUS_SYSTEM_LOG_ERROR,
968 "SELinux enabled but D-Bus initialization failed; "
973 if (!bus_apparmor_full_init (error))
975 _DBUS_ASSERT_ERROR_IS_SET (error);
979 if (bus_apparmor_enabled ())
981 /* Only print AppArmor mediation message when syslog support is enabled */
983 bus_context_log (context, DBUS_SYSTEM_LOG_INFO,
984 "AppArmor D-Bus mediation is enabled\n");
987 /* When SELinux is used, this must happen after bus_selinux_full_init()
988 * so that it has access to the access vector cache, which is required
989 * to process <associate/> elements.
990 * http://lists.freedesktop.org/archives/dbus/2008-October/010491.html
992 if (!process_config_postinit (context, parser, error))
994 _DBUS_ASSERT_ERROR_IS_SET (error);
1000 bus_config_parser_unref (parser);
1004 dbus_server_free_data_slot (&server_data_slot);
1010 bus_config_parser_unref (parser);
1011 if (context != NULL)
1012 bus_context_unref (context);
1014 if (server_data_slot >= 0)
1015 dbus_server_free_data_slot (&server_data_slot);
1021 bus_context_get_id (BusContext *context,
1024 return _dbus_uuid_encode (&context->uuid, uuid);
1028 bus_context_reload_config (BusContext *context,
1031 BusConfigParser *parser;
1032 DBusString config_file;
1035 /* Flush the user database cache */
1036 _dbus_flush_caches ();
1039 _dbus_string_init_const (&config_file, context->config_file);
1040 parser = bus_config_load (&config_file, TRUE, NULL, error);
1043 _DBUS_ASSERT_ERROR_IS_SET (error);
1047 if (!process_config_every_time (context, parser, TRUE, error))
1049 _DBUS_ASSERT_ERROR_IS_SET (error);
1052 if (!process_config_postinit (context, parser, error))
1054 _DBUS_ASSERT_ERROR_IS_SET (error);
1059 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
1062 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
1064 bus_config_parser_unref (parser);
1069 shutdown_server (BusContext *context,
1072 if (server == NULL ||
1073 !dbus_server_get_is_connected (server))
1076 if (!dbus_server_set_watch_functions (server,
1080 _dbus_assert_not_reached ("setting watch functions to NULL failed");
1082 if (!dbus_server_set_timeout_functions (server,
1086 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
1088 dbus_server_disconnect (server);
1092 bus_context_shutdown (BusContext *context)
1096 link = _dbus_list_get_first_link (&context->servers);
1097 while (link != NULL)
1099 shutdown_server (context, link->data);
1101 link = _dbus_list_get_next_link (&context->servers, link);
1106 bus_context_ref (BusContext *context)
1108 _dbus_assert (context->refcount > 0);
1109 context->refcount += 1;
1115 bus_context_unref (BusContext *context)
1117 _dbus_assert (context->refcount > 0);
1118 context->refcount -= 1;
1120 if (context->refcount == 0)
1124 _dbus_verbose ("Finalizing bus context %p\n", context);
1126 bus_context_shutdown (context);
1128 if (context->connections)
1130 bus_connections_unref (context->connections);
1131 context->connections = NULL;
1134 if (context->registry)
1136 bus_registry_unref (context->registry);
1137 context->registry = NULL;
1140 if (context->activation)
1142 bus_activation_unref (context->activation);
1143 context->activation = NULL;
1146 link = _dbus_list_get_first_link (&context->servers);
1147 while (link != NULL)
1149 dbus_server_unref (link->data);
1151 link = _dbus_list_get_next_link (&context->servers, link);
1153 _dbus_list_clear (&context->servers);
1155 if (context->policy)
1157 bus_policy_unref (context->policy);
1158 context->policy = NULL;
1163 _dbus_loop_unref (context->loop);
1164 context->loop = NULL;
1167 if (context->matchmaker)
1169 bus_matchmaker_unref (context->matchmaker);
1170 context->matchmaker = NULL;
1173 dbus_free (context->config_file);
1174 dbus_free (context->log_prefix);
1175 dbus_free (context->type);
1176 dbus_free (context->address);
1177 dbus_free (context->user);
1178 dbus_free (context->servicehelper);
1180 if (context->pidfile)
1183 _dbus_string_init_const (&u, context->pidfile);
1185 /* Deliberately ignore errors here, since there's not much
1186 * we can do about it, and we're exiting anyways.
1188 _dbus_delete_file (&u, NULL);
1190 dbus_free (context->pidfile);
1193 if (context->initial_fd_limit)
1194 _dbus_rlimit_free (context->initial_fd_limit);
1196 dbus_free (context);
1198 dbus_server_free_data_slot (&server_data_slot);
1202 /* type may be NULL */
1204 bus_context_get_type (BusContext *context)
1206 return context->type;
1210 bus_context_get_address (BusContext *context)
1212 return context->address;
1216 bus_context_get_servicehelper (BusContext *context)
1218 return context->servicehelper;
1222 bus_context_get_systemd_activation (BusContext *context)
1224 return context->systemd_activation;
1228 bus_context_get_registry (BusContext *context)
1230 return context->registry;
1234 bus_context_get_connections (BusContext *context)
1236 return context->connections;
1240 bus_context_get_activation (BusContext *context)
1242 return context->activation;
1246 bus_context_get_matchmaker (BusContext *context)
1248 return context->matchmaker;
1252 bus_context_get_loop (BusContext *context)
1254 return context->loop;
1258 bus_context_allow_unix_user (BusContext *context,
1261 return bus_policy_allow_unix_user (context->policy,
1265 /* For now this is never actually called because the default
1266 * DBusConnection behavior of 'same user that owns the bus can connect'
1267 * is all it would do.
1270 bus_context_allow_windows_user (BusContext *context,
1271 const char *windows_sid)
1273 return bus_policy_allow_windows_user (context->policy,
1278 bus_context_get_policy (BusContext *context)
1280 return context->policy;
1284 bus_context_create_client_policy (BusContext *context,
1285 DBusConnection *connection,
1288 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1289 return bus_policy_create_client_policy (context->policy, connection,
1294 bus_context_get_activation_timeout (BusContext *context)
1297 return context->limits.activation_timeout;
1301 bus_context_get_auth_timeout (BusContext *context)
1303 return context->limits.auth_timeout;
1307 bus_context_get_pending_fd_timeout (BusContext *context)
1309 return context->limits.pending_fd_timeout;
1313 bus_context_get_max_completed_connections (BusContext *context)
1315 return context->limits.max_completed_connections;
1319 bus_context_get_max_incomplete_connections (BusContext *context)
1321 return context->limits.max_incomplete_connections;
1325 bus_context_get_max_connections_per_user (BusContext *context)
1327 return context->limits.max_connections_per_user;
1331 bus_context_get_max_pending_activations (BusContext *context)
1333 return context->limits.max_pending_activations;
1337 bus_context_get_max_services_per_connection (BusContext *context)
1339 return context->limits.max_services_per_connection;
1343 bus_context_get_max_match_rules_per_connection (BusContext *context)
1345 return context->limits.max_match_rules_per_connection;
1349 bus_context_get_max_replies_per_connection (BusContext *context)
1351 return context->limits.max_replies_per_connection;
1355 bus_context_get_reply_timeout (BusContext *context)
1357 return context->limits.reply_timeout;
1361 bus_context_get_initial_fd_limit (BusContext *context)
1363 return context->initial_fd_limit;
1367 bus_context_get_using_syslog (BusContext *context)
1369 return context->syslog;
1373 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1377 va_start (args, msg);
1379 if (context->log_prefix)
1381 DBusString full_msg;
1383 if (!_dbus_string_init (&full_msg))
1385 if (!_dbus_string_append (&full_msg, context->log_prefix))
1387 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1390 _dbus_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1392 _dbus_string_free (&full_msg);
1395 _dbus_logv (severity, msg, args);
1401 static inline const char *
1402 nonnull (const char *maybe_null,
1403 const char *if_null)
1405 return (maybe_null ? maybe_null : if_null);
1409 bus_context_log_literal (BusContext *context,
1410 DBusSystemLogSeverity severity,
1413 _dbus_log (severity, "%s%s", nonnull (context->log_prefix, ""), msg);
1417 bus_context_log_and_set_error (BusContext *context,
1418 DBusSystemLogSeverity severity,
1424 DBusError stack_error = DBUS_ERROR_INIT;
1427 va_start (args, msg);
1428 _dbus_set_error_valist (&stack_error, name, msg, args);
1431 /* If we hit OOM while setting the error, this will syslog "out of memory"
1432 * which is itself an indication that something is seriously wrong */
1433 bus_context_log_literal (context, DBUS_SYSTEM_LOG_SECURITY,
1434 stack_error.message);
1436 dbus_move_error (&stack_error, error);
1440 * Log something about a message, usually that it was rejected.
1443 complain_about_message (BusContext *context,
1444 const char *error_name,
1445 const char *complaint,
1447 DBusMessage *message,
1448 DBusConnection *sender,
1449 DBusConnection *proposed_recipient,
1450 dbus_bool_t requested_reply,
1454 DBusError stack_error = DBUS_ERROR_INIT;
1455 const char *sender_name;
1456 const char *sender_loginfo;
1457 const char *proposed_recipient_loginfo;
1459 if (error == NULL && !log)
1464 sender_name = bus_connection_get_name (sender);
1465 sender_loginfo = bus_connection_get_loginfo (sender);
1469 sender_name = "(unset)";
1470 sender_loginfo = "(bus)";
1473 if (proposed_recipient != NULL)
1474 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1476 proposed_recipient_loginfo = "bus";
1478 dbus_set_error (&stack_error, error_name,
1479 "%s, %d matched rules; type=\"%s\", sender=\"%s\" (%s) "
1480 "interface=\"%s\" member=\"%s\" error name=\"%s\" "
1481 "requested_reply=\"%d\" destination=\"%s\" (%s)",
1484 dbus_message_type_to_string (dbus_message_get_type (message)),
1487 nonnull (dbus_message_get_interface (message), "(unset)"),
1488 nonnull (dbus_message_get_member (message), "(unset)"),
1489 nonnull (dbus_message_get_error_name (message), "(unset)"),
1491 nonnull (dbus_message_get_destination (message), DBUS_SERVICE_DBUS),
1492 proposed_recipient_loginfo);
1494 /* If we hit OOM while setting the error, this will syslog "out of memory"
1495 * which is itself an indication that something is seriously wrong */
1497 bus_context_log_literal (context, DBUS_SYSTEM_LOG_SECURITY,
1498 stack_error.message);
1500 dbus_move_error (&stack_error, error);
1504 * addressed_recipient is the recipient specified in the message.
1506 * proposed_recipient is the recipient we're considering sending
1507 * to right this second, and may be an eavesdropper.
1509 * sender is the sender of the message.
1511 * NULL for sender definitely means the bus driver.
1513 * NULL for proposed_recipient may mean the bus driver, or may mean
1514 * we are checking whether service-activation is allowed as a first
1515 * pass before all details of the activated service are known.
1517 * NULL for addressed_recipient may mean the bus driver, or may mean
1518 * no destination was specified in the message (e.g. a signal).
1521 bus_context_check_security_policy (BusContext *context,
1522 BusTransaction *transaction,
1523 DBusConnection *sender,
1524 DBusConnection *addressed_recipient,
1525 DBusConnection *proposed_recipient,
1526 DBusMessage *message,
1527 BusActivationEntry *activation_entry,
1530 const char *src, *dest;
1531 BusClientPolicy *sender_policy;
1532 BusClientPolicy *recipient_policy;
1533 dbus_int32_t toggles;
1536 dbus_bool_t requested_reply;
1538 type = dbus_message_get_type (message);
1539 src = dbus_message_get_sender (message);
1540 dest = dbus_message_get_destination (message);
1542 /* dispatch.c was supposed to ensure these invariants */
1543 _dbus_assert (dest != NULL ||
1544 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1545 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1546 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1547 addressed_recipient != NULL ||
1548 activation_entry != NULL ||
1549 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1553 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1554 case DBUS_MESSAGE_TYPE_SIGNAL:
1555 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1556 case DBUS_MESSAGE_TYPE_ERROR:
1560 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1563 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1564 "Message bus will not accept messages of unknown type\n");
1569 requested_reply = FALSE;
1573 if (bus_connection_is_active (sender))
1575 sender_policy = bus_connection_get_policy (sender);
1576 _dbus_assert (sender_policy != NULL);
1578 /* Fill in requested_reply variable with TRUE if this is a
1579 * reply and the reply was pending.
1581 if (dbus_message_get_reply_serial (message) != 0)
1583 if (proposed_recipient != NULL /* not to the bus driver */ &&
1584 addressed_recipient == proposed_recipient /* not eavesdropping */)
1588 dbus_error_init (&error2);
1589 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1591 sender, addressed_recipient, message,
1593 if (dbus_error_is_set (&error2))
1595 dbus_move_error (&error2, error);
1603 sender_policy = NULL;
1606 /* First verify the SELinux access controls. If allowed then
1607 * go on with the standard checks.
1609 if (!bus_selinux_allows_send (sender, proposed_recipient,
1610 dbus_message_type_to_string (dbus_message_get_type (message)),
1611 dbus_message_get_interface (message),
1612 dbus_message_get_member (message),
1613 dbus_message_get_error_name (message),
1614 dest ? dest : DBUS_SERVICE_DBUS,
1618 if (error != NULL && !dbus_error_is_set (error))
1620 /* don't syslog this, just set the error: avc_has_perm should
1621 * have already written to either the audit log or syslog */
1622 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1623 "An SELinux policy prevents this sender from sending this "
1624 "message to this recipient",
1625 0, message, sender, proposed_recipient, FALSE, FALSE, error);
1626 _dbus_verbose ("SELinux security check denying send to service\n");
1632 /* next verify AppArmor access controls. If allowed then
1633 * go on with the standard checks.
1635 if (!bus_apparmor_allows_send (sender, proposed_recipient,
1637 bus_context_get_type (context),
1638 dbus_message_get_type (message),
1639 dbus_message_get_path (message),
1640 dbus_message_get_interface (message),
1641 dbus_message_get_member (message),
1642 dbus_message_get_error_name (message),
1643 dest ? dest : DBUS_SERVICE_DBUS,
1644 src ? src : DBUS_SERVICE_DBUS,
1649 if (!bus_connection_is_active (sender))
1651 /* Policy for inactive connections is that they can only send
1652 * the hello message to the bus driver
1654 if (proposed_recipient == NULL &&
1655 dbus_message_is_method_call (message,
1656 DBUS_INTERFACE_DBUS,
1659 _dbus_verbose ("security check allowing %s message\n",
1665 _dbus_verbose ("security check disallowing non-%s message\n",
1668 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1669 "Client tried to send a message other than %s without being registered",
1678 sender_policy = NULL;
1680 /* If the sender is the bus driver, we assume any reply was a
1681 * requested reply as bus driver won't send bogus ones
1683 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1684 dbus_message_get_reply_serial (message) != 0)
1685 requested_reply = TRUE;
1688 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1689 (sender == NULL && sender_policy == NULL));
1691 if (proposed_recipient != NULL)
1693 /* only the bus driver can send to an inactive recipient (as it
1694 * owns no services, so other apps can't address it). Inactive
1695 * recipients can receive any message.
1697 if (bus_connection_is_active (proposed_recipient))
1699 recipient_policy = bus_connection_get_policy (proposed_recipient);
1700 _dbus_assert (recipient_policy != NULL);
1702 else if (sender == NULL)
1704 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1705 recipient_policy = NULL;
1709 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus");
1710 recipient_policy = NULL;
1714 recipient_policy = NULL;
1716 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1717 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1718 (proposed_recipient == NULL && recipient_policy == NULL));
1721 if (sender_policy &&
1722 !bus_client_policy_check_can_send (sender_policy,
1726 message, &toggles, &log))
1728 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1729 "Rejected send message", toggles,
1730 message, sender, proposed_recipient, requested_reply,
1731 (addressed_recipient == proposed_recipient), error);
1732 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1738 /* We want to drop this message, and are only not doing so for backwards
1740 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1741 "Would reject message", toggles,
1742 message, sender, proposed_recipient, requested_reply,
1746 if (recipient_policy &&
1747 !bus_client_policy_check_can_receive (recipient_policy,
1751 addressed_recipient, proposed_recipient,
1754 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1755 "Rejected receive message", toggles,
1756 message, sender, proposed_recipient, requested_reply,
1757 (addressed_recipient == proposed_recipient), error);
1758 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1762 /* See if limits on size have been exceeded */
1763 if (proposed_recipient &&
1764 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1765 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1767 complain_about_message (context, DBUS_ERROR_LIMITS_EXCEEDED,
1768 "Rejected: destination has a full message queue",
1769 0, message, sender, proposed_recipient, requested_reply, TRUE,
1771 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1775 /* Record that we will allow a reply here in the future (don't
1776 * bother if the recipient is the bus or this is an eavesdropping
1777 * connection). Only the addressed recipient may reply.
1779 * This isn't done for activation attempts because they have no addressed
1780 * or proposed recipient; when we check whether to actually deliver the
1781 * message, later, we'll record the reply expectation at that point.
1783 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1785 addressed_recipient &&
1786 addressed_recipient == proposed_recipient && /* not eavesdropping */
1787 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1789 sender, addressed_recipient,
1792 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1796 _dbus_verbose ("security policy allowing message\n");
1801 bus_context_check_all_watches (BusContext *context)
1804 dbus_bool_t enabled = TRUE;
1806 if (bus_connections_get_n_incomplete (context->connections) >=
1807 bus_context_get_max_incomplete_connections (context))
1812 if (context->watches_enabled == enabled)
1815 context->watches_enabled = enabled;
1817 for (link = _dbus_list_get_first_link (&context->servers);
1819 link = _dbus_list_get_next_link (&context->servers, link))
1821 /* A BusContext might contains several DBusServer (if there are
1822 * several <listen> configuration items) and a DBusServer might
1823 * contain several DBusWatch in its DBusWatchList (if getaddrinfo
1824 * returns several addresses on a dual IPv4-IPv6 stack or if
1825 * systemd passes several fds).
1826 * We want to enable/disable them all.
1828 DBusServer *server = link->data;
1829 _dbus_server_toggle_all_watches (server, enabled);