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"
39 #include "dir-watch.h"
40 #include <dbus/dbus-auth.h>
41 #include <dbus/dbus-list.h>
42 #include <dbus/dbus-hash.h>
43 #include <dbus/dbus-credentials.h>
44 #include <dbus/dbus-internals.h>
45 #include <dbus/dbus-server-protected.h>
64 BusConnections *connections;
65 BusActivation *activation;
66 BusRegistry *registry;
68 BusMatchmaker *matchmaker;
70 DBusRLimit *initial_fd_limit;
71 unsigned int fork : 1;
72 unsigned int syslog : 1;
73 unsigned int keep_umask : 1;
74 unsigned int allow_anonymous : 1;
75 unsigned int systemd_activation : 1;
76 dbus_bool_t watches_enabled;
79 static dbus_int32_t server_data_slot = -1;
86 #define BUS_SERVER_DATA(server) (dbus_server_get_data ((server), server_data_slot))
89 server_get_context (DBusServer *server)
94 /* this data slot was allocated by the BusContext */
95 _dbus_assert (server_data_slot >= 0);
97 bd = BUS_SERVER_DATA (server);
99 /* every DBusServer in the dbus-daemon has gone through setup_server() */
100 _dbus_assert (bd != NULL);
102 context = bd->context;
108 add_server_watch (DBusWatch *watch,
111 DBusServer *server = data;
114 context = server_get_context (server);
116 return _dbus_loop_add_watch (context->loop, watch);
120 remove_server_watch (DBusWatch *watch,
123 DBusServer *server = data;
126 context = server_get_context (server);
128 _dbus_loop_remove_watch (context->loop, watch);
132 toggle_server_watch (DBusWatch *watch,
135 DBusServer *server = data;
138 context = server_get_context (server);
140 _dbus_loop_toggle_watch (context->loop, watch);
144 add_server_timeout (DBusTimeout *timeout,
147 DBusServer *server = data;
150 context = server_get_context (server);
152 return _dbus_loop_add_timeout (context->loop, timeout);
156 remove_server_timeout (DBusTimeout *timeout,
159 DBusServer *server = data;
162 context = server_get_context (server);
164 _dbus_loop_remove_timeout (context->loop, timeout);
168 new_connection_callback (DBusServer *server,
169 DBusConnection *new_connection,
172 BusContext *context = data;
174 if (!bus_connections_setup_connection (context->connections, new_connection))
176 _dbus_verbose ("No memory to setup new connection\n");
178 /* if we don't do this, it will get unref'd without
179 * being disconnected... kind of strange really
180 * that we have to do this, people won't get it right
183 dbus_connection_close (new_connection);
186 dbus_connection_set_max_received_size (new_connection,
187 context->limits.max_incoming_bytes);
189 dbus_connection_set_max_message_size (new_connection,
190 context->limits.max_message_size);
192 dbus_connection_set_max_received_unix_fds (new_connection,
193 context->limits.max_incoming_unix_fds);
195 dbus_connection_set_max_message_unix_fds (new_connection,
196 context->limits.max_message_unix_fds);
198 dbus_connection_set_allow_anonymous (new_connection,
199 context->allow_anonymous);
201 /* on OOM, we won't have ref'd the connection so it will die. */
205 free_server_data (void *data)
207 BusServerData *bd = data;
213 setup_server (BusContext *context,
215 char **auth_mechanisms,
220 bd = dbus_new0 (BusServerData, 1);
221 if (bd == NULL || !dbus_server_set_data (server,
223 bd, free_server_data))
230 bd->context = context;
232 if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms))
238 dbus_server_set_new_connection_function (server,
239 new_connection_callback,
242 if (!dbus_server_set_watch_functions (server,
253 if (!dbus_server_set_timeout_functions (server,
255 remove_server_timeout,
266 /* This code only gets executed the first time the
267 * config files are parsed. It is not executed
268 * when config files are reloaded.
271 process_config_first_time_only (BusContext *context,
272 BusConfigParser *parser,
273 const DBusString *address,
274 BusContextFlags flags,
277 DBusString log_prefix;
279 DBusList **addresses;
280 const char *user, *pidfile;
281 char **auth_mechanisms;
282 DBusList **auth_mechanisms_list;
285 DBusLogFlags log_flags = DBUS_LOG_FLAGS_STDERR;
287 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
290 auth_mechanisms = NULL;
293 if (flags & BUS_CONTEXT_FLAG_SYSLOG_ALWAYS)
295 context->syslog = TRUE;
296 log_flags |= DBUS_LOG_FLAGS_SYSTEM_LOG;
298 if (flags & BUS_CONTEXT_FLAG_SYSLOG_ONLY)
299 log_flags &= ~DBUS_LOG_FLAGS_STDERR;
301 else if (flags & BUS_CONTEXT_FLAG_SYSLOG_NEVER)
303 context->syslog = FALSE;
307 context->syslog = bus_config_parser_get_syslog (parser);
310 log_flags |= DBUS_LOG_FLAGS_SYSTEM_LOG;
313 _dbus_init_system_log ("dbus-daemon", log_flags);
315 if (flags & BUS_CONTEXT_FLAG_SYSTEMD_ACTIVATION)
316 context->systemd_activation = TRUE;
318 context->systemd_activation = FALSE;
320 /* Check for an existing pid file. Of course this is a race;
321 * we'd have to use fcntl() locks on the pid file to
322 * avoid that. But we want to check for the pid file
323 * before overwriting any existing sockets, etc.
326 if (flags & BUS_CONTEXT_FLAG_WRITE_PID_FILE)
327 pidfile = bus_config_parser_get_pidfile (parser);
334 _dbus_string_init_const (&u, pidfile);
336 if (_dbus_stat (&u, &stbuf, NULL))
342 _dbus_string_init (&p);
343 _dbus_file_get_contents(&p, &u, NULL);
344 _dbus_string_parse_int(&p, 0, &pid, NULL);
345 _dbus_string_free(&p);
347 if ((kill((int)pid, 0))) {
348 dbus_set_error(NULL, DBUS_ERROR_FILE_EXISTS,
349 "pid %ld not running, removing stale pid file\n",
351 _dbus_delete_file(&u, NULL);
354 dbus_set_error (error, DBUS_ERROR_FAILED,
355 "The pid file \"%s\" exists, if the message bus is not running, remove this file",
364 /* keep around the pid filename so we can delete it later */
365 context->pidfile = _dbus_strdup (pidfile);
367 /* note that type may be NULL */
368 context->type = _dbus_strdup (bus_config_parser_get_type (parser));
369 if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
372 user = bus_config_parser_get_user (parser);
375 context->user = _dbus_strdup (user);
376 if (context->user == NULL)
380 /* Set up the prefix for syslog messages */
381 if (!_dbus_string_init (&log_prefix))
383 if (context->type && !strcmp (context->type, "system"))
385 if (!_dbus_string_append (&log_prefix, "[system] "))
388 else if (context->type && !strcmp (context->type, "session"))
390 DBusCredentials *credentials;
392 credentials = _dbus_credentials_new_from_current_process ();
395 if (!_dbus_string_append (&log_prefix, "[session "))
397 _dbus_credentials_unref (credentials);
400 if (!_dbus_credentials_to_string_append (credentials, &log_prefix))
402 _dbus_credentials_unref (credentials);
405 if (!_dbus_string_append (&log_prefix, "] "))
407 _dbus_credentials_unref (credentials);
410 _dbus_credentials_unref (credentials);
412 if (!_dbus_string_steal_data (&log_prefix, &context->log_prefix))
414 _dbus_string_free (&log_prefix);
416 /* Build an array of auth mechanisms */
418 auth_mechanisms_list = bus_config_parser_get_mechanisms (parser);
419 len = _dbus_list_get_length (auth_mechanisms_list);
425 auth_mechanisms = dbus_new0 (char*, len + 1);
426 if (auth_mechanisms == NULL)
430 link = _dbus_list_get_first_link (auth_mechanisms_list);
434 _dbus_string_init_const (&name, link->data);
435 if (!_dbus_auth_is_supported_mechanism (&name))
438 if (!_dbus_string_init (&list))
441 if (!_dbus_auth_dump_supported_mechanisms (&list))
443 _dbus_string_free (&list);
446 dbus_set_error (error, DBUS_ERROR_FAILED,
447 "Unsupported auth mechanism \"%s\" in bus config file detected. Supported mechanisms are \"%s\".",
449 _dbus_string_get_const_data (&list));
450 _dbus_string_free (&list);
453 auth_mechanisms[i] = _dbus_strdup (link->data);
454 if (auth_mechanisms[i] == NULL)
456 link = _dbus_list_get_next_link (auth_mechanisms_list, link);
462 auth_mechanisms = NULL;
465 /* Listen on our addresses */
471 server = dbus_server_listen (_dbus_string_get_const_data(address), error);
474 _DBUS_ASSERT_ERROR_IS_SET (error);
477 else if (!setup_server (context, server, auth_mechanisms, error))
479 _DBUS_ASSERT_ERROR_IS_SET (error);
483 if (!_dbus_list_append (&context->servers, server))
488 addresses = bus_config_parser_get_addresses (parser);
490 link = _dbus_list_get_first_link (addresses);
495 server = dbus_server_listen (link->data, error);
498 _DBUS_ASSERT_ERROR_IS_SET (error);
501 else if (!setup_server (context, server, auth_mechanisms, error))
503 _DBUS_ASSERT_ERROR_IS_SET (error);
507 if (!_dbus_list_append (&context->servers, server))
510 link = _dbus_list_get_next_link (addresses, link);
514 context->fork = bus_config_parser_get_fork (parser);
515 context->keep_umask = bus_config_parser_get_keep_umask (parser);
516 context->allow_anonymous = bus_config_parser_get_allow_anonymous (parser);
518 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
522 dbus_free_string_array (auth_mechanisms);
527 dbus_free_string_array (auth_mechanisms);
531 /* This code gets executed every time the config files
532 * are parsed: both during BusContext construction
533 * and on reloads. This function is slightly screwy
534 * since it can do a "half reload" in out-of-memory
535 * situations. Realistically, unlikely to ever matter.
538 process_config_every_time (BusContext *context,
539 BusConfigParser *parser,
540 dbus_bool_t is_reload,
543 DBusString full_address;
547 const char *servicehelper;
552 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
557 if (!_dbus_string_init (&full_address))
563 /* get our limits and timeout lengths */
564 bus_config_parser_get_limits (parser, &context->limits);
567 bus_policy_unref (context->policy);
568 context->policy = bus_config_parser_steal_policy (parser);
569 _dbus_assert (context->policy != NULL);
571 /* context->connections is NULL when creating new BusContext */
572 if (context->connections)
574 _dbus_verbose ("Reload policy rules for completed connections\n");
575 retval = bus_connections_reload_policy (context->connections, error);
578 _DBUS_ASSERT_ERROR_IS_SET (error);
583 /* We have to build the address backward, so that
584 * <listen> later in the config file have priority
586 link = _dbus_list_get_last_link (&context->servers);
589 addr = dbus_server_get_address (link->data);
596 if (_dbus_string_get_length (&full_address) > 0)
598 if (!_dbus_string_append (&full_address, ";"))
605 if (!_dbus_string_append (&full_address, addr))
614 link = _dbus_list_get_prev_link (&context->servers, link);
618 dbus_free (context->address);
620 if (!_dbus_string_copy_data (&full_address, &context->address))
626 /* get the service directories */
627 dirs = bus_config_parser_get_service_dirs (parser);
629 /* and the service helper */
630 servicehelper = bus_config_parser_get_servicehelper (parser);
632 s = _dbus_strdup(servicehelper);
633 if (s == NULL && servicehelper != NULL)
640 dbus_free(context->servicehelper);
641 context->servicehelper = s;
644 /* Create activation subsystem */
645 if (context->activation)
647 if (!bus_activation_reload (context->activation, &full_address, dirs, error))
652 context->activation = bus_activation_new (context, &full_address, dirs, error);
655 if (context->activation == NULL)
657 _DBUS_ASSERT_ERROR_IS_SET (error);
661 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
665 _dbus_string_free (&full_address);
674 list_concat_new (DBusList **a,
682 for (link = _dbus_list_get_first_link (a); link; link = _dbus_list_get_next_link (a, link))
684 if (!_dbus_list_append (result, link->data))
687 for (link = _dbus_list_get_first_link (b); link; link = _dbus_list_get_next_link (b, link))
689 if (!_dbus_list_append (result, link->data))
695 _dbus_list_clear (result);
700 raise_file_descriptor_limit (BusContext *context)
703 DBusError error = DBUS_ERROR_INIT;
705 /* we only do this once */
706 if (context->initial_fd_limit != NULL)
709 context->initial_fd_limit = _dbus_rlimit_save_fd_limit (&error);
711 if (context->initial_fd_limit == NULL)
713 bus_context_log (context, DBUS_SYSTEM_LOG_WARNING,
714 "%s: %s", error.name, error.message);
715 dbus_error_free (&error);
719 /* We used to compute a suitable rlimit based on the configured number
720 * of connections, but that breaks down as soon as we allow fd-passing,
721 * because each connection is allowed to pass 64 fds to us, and if
722 * they all did, we'd hit kernel limits. We now hard-code 64k as a
723 * good limit, like systemd does: that's enough to avoid DoS from
724 * anything short of multiple uids conspiring against us.
726 if (!_dbus_rlimit_raise_fd_limit_if_privileged (65536, &error))
728 bus_context_log (context, DBUS_SYSTEM_LOG_WARNING,
729 "%s: %s", error.name, error.message);
730 dbus_error_free (&error);
737 process_config_postinit (BusContext *context,
738 BusConfigParser *parser,
741 DBusHashTable *service_context_table;
742 DBusList *watched_dirs = NULL;
744 raise_file_descriptor_limit (context);
746 service_context_table = bus_config_parser_steal_service_context_table (parser);
747 if (!bus_registry_set_service_context_table (context->registry,
748 service_context_table))
754 _dbus_hash_table_unref (service_context_table);
756 /* We need to monitor both the configuration directories and directories
757 * containing .service files.
759 if (!list_concat_new (bus_config_parser_get_conf_dirs (parser),
760 bus_config_parser_get_service_dirs (parser),
767 bus_set_watched_dirs (context, &watched_dirs);
769 _dbus_list_clear (&watched_dirs);
775 bus_context_new (const DBusString *config_file,
776 BusContextFlags flags,
777 DBusPipe *print_addr_pipe,
778 DBusPipe *print_pid_pipe,
779 const DBusString *address,
783 BusConfigParser *parser;
785 _dbus_assert ((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 ||
786 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS) == 0);
788 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
793 if (!dbus_server_allocate_data_slot (&server_data_slot))
799 context = dbus_new0 (BusContext, 1);
805 context->refcount = 1;
807 if (!_dbus_generate_uuid (&context->uuid, error))
810 if (!_dbus_string_copy_data (config_file, &context->config_file))
816 context->loop = _dbus_loop_new ();
817 if (context->loop == NULL)
823 context->watches_enabled = TRUE;
825 context->registry = bus_registry_new (context);
826 if (context->registry == NULL)
832 parser = bus_config_load (config_file, TRUE, NULL, error);
835 _DBUS_ASSERT_ERROR_IS_SET (error);
839 if (!process_config_first_time_only (context, parser, address, flags, error))
841 _DBUS_ASSERT_ERROR_IS_SET (error);
844 if (!process_config_every_time (context, parser, FALSE, error))
846 _DBUS_ASSERT_ERROR_IS_SET (error);
850 /* we need another ref of the server data slot for the context
853 if (!dbus_server_allocate_data_slot (&server_data_slot))
854 _dbus_assert_not_reached ("second ref of server data slot failed");
856 /* Note that we don't know whether the print_addr_pipe is
857 * one of the sockets we're using to listen on, or some
858 * other random thing. But I think the answer is "don't do
861 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
864 const char *a = bus_context_get_address (context);
867 _dbus_assert (a != NULL);
868 if (!_dbus_string_init (&addr))
874 if (!_dbus_string_append (&addr, a) ||
875 !_dbus_string_append (&addr, "\n"))
877 _dbus_string_free (&addr);
882 bytes = _dbus_string_get_length (&addr);
883 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
885 /* pipe write returns an error on failure but not short write */
886 if (error != NULL && !dbus_error_is_set (error))
888 dbus_set_error (error, DBUS_ERROR_FAILED,
889 "Printing message bus address: did not write all bytes\n");
891 _dbus_string_free (&addr);
895 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
896 _dbus_pipe_close (print_addr_pipe, NULL);
898 _dbus_string_free (&addr);
901 context->connections = bus_connections_new (context);
902 if (context->connections == NULL)
908 context->matchmaker = bus_matchmaker_new ();
909 if (context->matchmaker == NULL)
915 /* check user before we fork */
916 if (context->user != NULL)
918 if (!_dbus_verify_daemon_user (context->user))
920 dbus_set_error (error, DBUS_ERROR_FAILED,
921 "Could not get UID and GID for username \"%s\"",
927 /* Now become a daemon if appropriate and write out pid file in any case */
931 if (context->pidfile)
932 _dbus_string_init_const (&u, context->pidfile);
934 if (((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 && context->fork) ||
935 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS))
937 _dbus_verbose ("Forking and becoming daemon\n");
939 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
942 context->keep_umask))
944 _DBUS_ASSERT_ERROR_IS_SET (error);
950 _dbus_verbose ("Fork not requested\n");
952 /* Need to write PID file and to PID pipe for ourselves,
953 * not for the child process. This is a no-op if the pidfile
954 * is NULL and print_pid_pipe is NULL.
956 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
961 _DBUS_ASSERT_ERROR_IS_SET (error);
967 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
968 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
969 _dbus_pipe_close (print_pid_pipe, NULL);
971 /* Here we change our credentials if required,
972 * as soon as we've set up our sockets and pidfile.
973 * This must be done before initializing LSMs, so that the netlink
974 * monitoring thread started by avc_init() will not lose CAP_AUDIT_WRITE
975 * when the main thread calls setuid().
976 * https://bugs.freedesktop.org/show_bug.cgi?id=92832
978 if (context->user != NULL)
980 if (!_dbus_change_to_daemon_user (context->user, error))
982 _DBUS_ASSERT_ERROR_IS_SET (error);
987 /* Auditing should be initialized before LSMs, so that the LSMs are able
988 * to log audit-events that happen during their initialization.
990 bus_audit_init (context);
992 if (!bus_selinux_full_init ())
994 bus_context_log (context, DBUS_SYSTEM_LOG_FATAL, "SELinux enabled but D-Bus initialization failed; check system log\n");
997 if (!bus_apparmor_full_init (error))
999 _DBUS_ASSERT_ERROR_IS_SET (error);
1003 if (bus_apparmor_enabled ())
1005 /* Only print AppArmor mediation message when syslog support is enabled */
1006 if (context->syslog)
1007 bus_context_log (context, DBUS_SYSTEM_LOG_INFO,
1008 "AppArmor D-Bus mediation is enabled\n");
1011 /* When SELinux is used, this must happen after bus_selinux_full_init()
1012 * so that it has access to the access vector cache, which is required
1013 * to process <associate/> elements.
1014 * http://lists.freedesktop.org/archives/dbus/2008-October/010491.html
1016 if (!process_config_postinit (context, parser, error))
1018 _DBUS_ASSERT_ERROR_IS_SET (error);
1024 bus_config_parser_unref (parser);
1028 dbus_server_free_data_slot (&server_data_slot);
1034 bus_config_parser_unref (parser);
1035 if (context != NULL)
1036 bus_context_unref (context);
1038 if (server_data_slot >= 0)
1039 dbus_server_free_data_slot (&server_data_slot);
1045 bus_context_get_id (BusContext *context,
1048 return _dbus_uuid_encode (&context->uuid, uuid);
1052 bus_context_reload_config (BusContext *context,
1055 BusConfigParser *parser;
1056 DBusString config_file;
1059 /* Flush the user database cache */
1060 _dbus_flush_caches ();
1063 _dbus_string_init_const (&config_file, context->config_file);
1064 parser = bus_config_load (&config_file, TRUE, NULL, error);
1067 _DBUS_ASSERT_ERROR_IS_SET (error);
1071 if (!process_config_every_time (context, parser, TRUE, error))
1073 _DBUS_ASSERT_ERROR_IS_SET (error);
1076 if (!process_config_postinit (context, parser, error))
1078 _DBUS_ASSERT_ERROR_IS_SET (error);
1083 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
1086 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
1088 bus_config_parser_unref (parser);
1093 shutdown_server (BusContext *context,
1096 if (server == NULL ||
1097 !dbus_server_get_is_connected (server))
1100 if (!dbus_server_set_watch_functions (server,
1104 _dbus_assert_not_reached ("setting watch functions to NULL failed");
1106 if (!dbus_server_set_timeout_functions (server,
1110 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
1112 dbus_server_disconnect (server);
1116 bus_context_shutdown (BusContext *context)
1120 link = _dbus_list_get_first_link (&context->servers);
1121 while (link != NULL)
1123 shutdown_server (context, link->data);
1125 link = _dbus_list_get_next_link (&context->servers, link);
1130 bus_context_ref (BusContext *context)
1132 _dbus_assert (context->refcount > 0);
1133 context->refcount += 1;
1139 bus_context_unref (BusContext *context)
1141 _dbus_assert (context->refcount > 0);
1142 context->refcount -= 1;
1144 if (context->refcount == 0)
1148 _dbus_verbose ("Finalizing bus context %p\n", context);
1150 bus_context_shutdown (context);
1152 if (context->connections)
1154 bus_connections_unref (context->connections);
1155 context->connections = NULL;
1158 if (context->registry)
1160 bus_registry_unref (context->registry);
1161 context->registry = NULL;
1164 if (context->activation)
1166 bus_activation_unref (context->activation);
1167 context->activation = NULL;
1170 link = _dbus_list_get_first_link (&context->servers);
1171 while (link != NULL)
1173 dbus_server_unref (link->data);
1175 link = _dbus_list_get_next_link (&context->servers, link);
1177 _dbus_list_clear (&context->servers);
1179 if (context->policy)
1181 bus_policy_unref (context->policy);
1182 context->policy = NULL;
1187 _dbus_loop_unref (context->loop);
1188 context->loop = NULL;
1191 if (context->matchmaker)
1193 bus_matchmaker_unref (context->matchmaker);
1194 context->matchmaker = NULL;
1197 dbus_free (context->config_file);
1198 dbus_free (context->log_prefix);
1199 dbus_free (context->type);
1200 dbus_free (context->address);
1201 dbus_free (context->user);
1202 dbus_free (context->servicehelper);
1204 if (context->pidfile)
1207 _dbus_string_init_const (&u, context->pidfile);
1209 /* Deliberately ignore errors here, since there's not much
1210 * we can do about it, and we're exiting anyways.
1212 _dbus_delete_file (&u, NULL);
1214 dbus_free (context->pidfile);
1217 if (context->initial_fd_limit)
1218 _dbus_rlimit_free (context->initial_fd_limit);
1220 dbus_free (context);
1222 dbus_server_free_data_slot (&server_data_slot);
1226 /* type may be NULL */
1228 bus_context_get_type (BusContext *context)
1230 return context->type;
1234 bus_context_get_address (BusContext *context)
1236 return context->address;
1240 bus_context_get_servicehelper (BusContext *context)
1242 return context->servicehelper;
1246 bus_context_get_systemd_activation (BusContext *context)
1248 return context->systemd_activation;
1252 bus_context_get_registry (BusContext *context)
1254 return context->registry;
1258 bus_context_get_connections (BusContext *context)
1260 return context->connections;
1264 bus_context_get_activation (BusContext *context)
1266 return context->activation;
1270 bus_context_get_matchmaker (BusContext *context)
1272 return context->matchmaker;
1276 bus_context_get_loop (BusContext *context)
1278 return context->loop;
1282 bus_context_allow_unix_user (BusContext *context,
1285 return bus_policy_allow_unix_user (context->policy,
1289 /* For now this is never actually called because the default
1290 * DBusConnection behavior of 'same user that owns the bus can connect'
1291 * is all it would do.
1294 bus_context_allow_windows_user (BusContext *context,
1295 const char *windows_sid)
1297 return bus_policy_allow_windows_user (context->policy,
1302 bus_context_get_policy (BusContext *context)
1304 return context->policy;
1308 bus_context_create_client_policy (BusContext *context,
1309 DBusConnection *connection,
1312 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1313 return bus_policy_create_client_policy (context->policy, connection,
1318 bus_context_get_activation_timeout (BusContext *context)
1321 return context->limits.activation_timeout;
1325 bus_context_get_auth_timeout (BusContext *context)
1327 return context->limits.auth_timeout;
1331 bus_context_get_pending_fd_timeout (BusContext *context)
1333 return context->limits.pending_fd_timeout;
1337 bus_context_get_max_completed_connections (BusContext *context)
1339 return context->limits.max_completed_connections;
1343 bus_context_get_max_incomplete_connections (BusContext *context)
1345 return context->limits.max_incomplete_connections;
1349 bus_context_get_max_connections_per_user (BusContext *context)
1351 return context->limits.max_connections_per_user;
1355 bus_context_get_max_pending_activations (BusContext *context)
1357 return context->limits.max_pending_activations;
1361 bus_context_get_max_services_per_connection (BusContext *context)
1363 return context->limits.max_services_per_connection;
1367 bus_context_get_max_match_rules_per_connection (BusContext *context)
1369 return context->limits.max_match_rules_per_connection;
1373 bus_context_get_max_replies_per_connection (BusContext *context)
1375 return context->limits.max_replies_per_connection;
1379 bus_context_get_reply_timeout (BusContext *context)
1381 return context->limits.reply_timeout;
1385 bus_context_get_initial_fd_limit (BusContext *context)
1387 return context->initial_fd_limit;
1391 bus_context_get_using_syslog (BusContext *context)
1393 return context->syslog;
1397 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1401 va_start (args, msg);
1403 if (context->log_prefix)
1405 DBusString full_msg;
1407 if (!_dbus_string_init (&full_msg))
1409 if (!_dbus_string_append (&full_msg, context->log_prefix))
1411 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1414 _dbus_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1416 _dbus_string_free (&full_msg);
1419 _dbus_logv (severity, msg, args);
1425 static inline const char *
1426 nonnull (const char *maybe_null,
1427 const char *if_null)
1429 return (maybe_null ? maybe_null : if_null);
1433 bus_context_log_literal (BusContext *context,
1434 DBusSystemLogSeverity severity,
1437 _dbus_log (severity, "%s%s", nonnull (context->log_prefix, ""), msg);
1441 bus_context_log_and_set_error (BusContext *context,
1442 DBusSystemLogSeverity severity,
1448 DBusError stack_error = DBUS_ERROR_INIT;
1451 va_start (args, msg);
1452 _dbus_set_error_valist (&stack_error, name, msg, args);
1455 /* If we hit OOM while setting the error, this will syslog "out of memory"
1456 * which is itself an indication that something is seriously wrong */
1457 bus_context_log_literal (context, DBUS_SYSTEM_LOG_SECURITY,
1458 stack_error.message);
1460 dbus_move_error (&stack_error, error);
1464 * Log something about a message, usually that it was rejected.
1467 complain_about_message (BusContext *context,
1468 const char *error_name,
1469 const char *complaint,
1471 DBusMessage *message,
1472 DBusConnection *sender,
1473 DBusConnection *proposed_recipient,
1474 dbus_bool_t requested_reply,
1478 DBusError stack_error = DBUS_ERROR_INIT;
1479 const char *sender_name;
1480 const char *sender_loginfo;
1481 const char *proposed_recipient_loginfo;
1483 if (error == NULL && !log)
1488 sender_name = bus_connection_get_name (sender);
1489 sender_loginfo = bus_connection_get_loginfo (sender);
1493 sender_name = "(unset)";
1494 sender_loginfo = "(bus)";
1497 if (proposed_recipient != NULL)
1498 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1500 proposed_recipient_loginfo = "bus";
1502 dbus_set_error (&stack_error, error_name,
1503 "%s, %d matched rules; type=\"%s\", sender=\"%s\" (%s) "
1504 "interface=\"%s\" member=\"%s\" error name=\"%s\" "
1505 "requested_reply=\"%d\" destination=\"%s\" (%s)",
1508 dbus_message_type_to_string (dbus_message_get_type (message)),
1511 nonnull (dbus_message_get_interface (message), "(unset)"),
1512 nonnull (dbus_message_get_member (message), "(unset)"),
1513 nonnull (dbus_message_get_error_name (message), "(unset)"),
1515 nonnull (dbus_message_get_destination (message), DBUS_SERVICE_DBUS),
1516 proposed_recipient_loginfo);
1518 /* If we hit OOM while setting the error, this will syslog "out of memory"
1519 * which is itself an indication that something is seriously wrong */
1521 bus_context_log_literal (context, DBUS_SYSTEM_LOG_SECURITY,
1522 stack_error.message);
1524 dbus_move_error (&stack_error, error);
1528 * addressed_recipient is the recipient specified in the message.
1530 * proposed_recipient is the recipient we're considering sending
1531 * to right this second, and may be an eavesdropper.
1533 * sender is the sender of the message.
1535 * NULL for sender definitely means the bus driver.
1537 * NULL for proposed_recipient may mean the bus driver, or may mean
1538 * we are checking whether service-activation is allowed as a first
1539 * pass before all details of the activated service are known.
1541 * NULL for addressed_recipient may mean the bus driver, or may mean
1542 * no destination was specified in the message (e.g. a signal).
1545 bus_context_check_security_policy (BusContext *context,
1546 BusTransaction *transaction,
1547 DBusConnection *sender,
1548 DBusConnection *addressed_recipient,
1549 DBusConnection *proposed_recipient,
1550 DBusMessage *message,
1551 BusActivationEntry *activation_entry,
1554 const char *src, *dest;
1555 BusClientPolicy *sender_policy;
1556 BusClientPolicy *recipient_policy;
1557 dbus_int32_t toggles;
1560 dbus_bool_t requested_reply;
1562 type = dbus_message_get_type (message);
1563 src = dbus_message_get_sender (message);
1564 dest = dbus_message_get_destination (message);
1566 /* dispatch.c was supposed to ensure these invariants */
1567 _dbus_assert (dest != NULL ||
1568 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1569 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1570 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1571 addressed_recipient != NULL ||
1572 activation_entry != NULL ||
1573 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1577 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1578 case DBUS_MESSAGE_TYPE_SIGNAL:
1579 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1580 case DBUS_MESSAGE_TYPE_ERROR:
1584 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1587 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1588 "Message bus will not accept messages of unknown type\n");
1593 requested_reply = FALSE;
1597 if (bus_connection_is_active (sender))
1599 sender_policy = bus_connection_get_policy (sender);
1600 _dbus_assert (sender_policy != NULL);
1602 /* Fill in requested_reply variable with TRUE if this is a
1603 * reply and the reply was pending.
1605 if (dbus_message_get_reply_serial (message) != 0)
1607 if (proposed_recipient != NULL /* not to the bus driver */ &&
1608 addressed_recipient == proposed_recipient /* not eavesdropping */)
1612 dbus_error_init (&error2);
1613 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1615 sender, addressed_recipient, message,
1617 if (dbus_error_is_set (&error2))
1619 dbus_move_error (&error2, error);
1627 sender_policy = NULL;
1630 /* First verify the SELinux access controls. If allowed then
1631 * go on with the standard checks.
1633 if (!bus_selinux_allows_send (sender, proposed_recipient,
1634 dbus_message_type_to_string (dbus_message_get_type (message)),
1635 dbus_message_get_interface (message),
1636 dbus_message_get_member (message),
1637 dbus_message_get_error_name (message),
1638 dest ? dest : DBUS_SERVICE_DBUS,
1642 if (error != NULL && !dbus_error_is_set (error))
1644 /* don't syslog this, just set the error: avc_has_perm should
1645 * have already written to either the audit log or syslog */
1646 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1647 "An SELinux policy prevents this sender from sending this "
1648 "message to this recipient",
1649 0, message, sender, proposed_recipient, FALSE, FALSE, error);
1650 _dbus_verbose ("SELinux security check denying send to service\n");
1656 /* next verify AppArmor access controls. If allowed then
1657 * go on with the standard checks.
1659 if (!bus_apparmor_allows_send (sender, proposed_recipient,
1661 bus_context_get_type (context),
1662 dbus_message_get_type (message),
1663 dbus_message_get_path (message),
1664 dbus_message_get_interface (message),
1665 dbus_message_get_member (message),
1666 dbus_message_get_error_name (message),
1667 dest ? dest : DBUS_SERVICE_DBUS,
1668 src ? src : DBUS_SERVICE_DBUS,
1673 if (!bus_connection_is_active (sender))
1675 /* Policy for inactive connections is that they can only send
1676 * the hello message to the bus driver
1678 if (proposed_recipient == NULL &&
1679 dbus_message_is_method_call (message,
1680 DBUS_INTERFACE_DBUS,
1683 _dbus_verbose ("security check allowing %s message\n",
1689 _dbus_verbose ("security check disallowing non-%s message\n",
1692 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1693 "Client tried to send a message other than %s without being registered",
1702 sender_policy = NULL;
1704 /* If the sender is the bus driver, we assume any reply was a
1705 * requested reply as bus driver won't send bogus ones
1707 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1708 dbus_message_get_reply_serial (message) != 0)
1709 requested_reply = TRUE;
1712 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1713 (sender == NULL && sender_policy == NULL));
1715 if (proposed_recipient != NULL)
1717 /* only the bus driver can send to an inactive recipient (as it
1718 * owns no services, so other apps can't address it). Inactive
1719 * recipients can receive any message.
1721 if (bus_connection_is_active (proposed_recipient))
1723 recipient_policy = bus_connection_get_policy (proposed_recipient);
1724 _dbus_assert (recipient_policy != NULL);
1726 else if (sender == NULL)
1728 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1729 recipient_policy = NULL;
1733 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus");
1734 recipient_policy = NULL;
1738 recipient_policy = NULL;
1740 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1741 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1742 (proposed_recipient == NULL && recipient_policy == NULL));
1745 if (sender_policy &&
1746 !bus_client_policy_check_can_send (sender_policy,
1750 message, &toggles, &log))
1752 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1753 "Rejected send message", toggles,
1754 message, sender, proposed_recipient, requested_reply,
1755 (addressed_recipient == proposed_recipient), error);
1756 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1762 /* We want to drop this message, and are only not doing so for backwards
1764 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1765 "Would reject message", toggles,
1766 message, sender, proposed_recipient, requested_reply,
1770 if (recipient_policy &&
1771 !bus_client_policy_check_can_receive (recipient_policy,
1775 addressed_recipient, proposed_recipient,
1778 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1779 "Rejected receive message", toggles,
1780 message, sender, proposed_recipient, requested_reply,
1781 (addressed_recipient == proposed_recipient), error);
1782 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1786 /* See if limits on size have been exceeded */
1787 if (proposed_recipient &&
1788 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1789 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1791 complain_about_message (context, DBUS_ERROR_LIMITS_EXCEEDED,
1792 "Rejected: destination has a full message queue",
1793 0, message, sender, proposed_recipient, requested_reply, TRUE,
1795 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1799 /* Record that we will allow a reply here in the future (don't
1800 * bother if the recipient is the bus or this is an eavesdropping
1801 * connection). Only the addressed recipient may reply.
1803 * This isn't done for activation attempts because they have no addressed
1804 * or proposed recipient; when we check whether to actually deliver the
1805 * message, later, we'll record the reply expectation at that point.
1807 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1809 addressed_recipient &&
1810 addressed_recipient == proposed_recipient && /* not eavesdropping */
1811 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1813 sender, addressed_recipient,
1816 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1820 _dbus_verbose ("security policy allowing message\n");
1825 bus_context_check_all_watches (BusContext *context)
1828 dbus_bool_t enabled = TRUE;
1830 if (bus_connections_get_n_incomplete (context->connections) >=
1831 bus_context_get_max_incomplete_connections (context))
1836 if (context->watches_enabled == enabled)
1839 context->watches_enabled = enabled;
1841 for (link = _dbus_list_get_first_link (&context->servers);
1843 link = _dbus_list_get_next_link (&context->servers, link))
1845 /* A BusContext might contains several DBusServer (if there are
1846 * several <listen> configuration items) and a DBusServer might
1847 * contain several DBusWatch in its DBusWatchList (if getaddrinfo
1848 * returns several addresses on a dual IPv4-IPv6 stack or if
1849 * systemd passes several fds).
1850 * We want to enable/disable them all.
1852 DBusServer *server = link->data;
1853 _dbus_server_toggle_all_watches (server, enabled);