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 this fails it logs a warning, so we don't need to do that */
176 if (!bus_connections_setup_connection (context->connections, new_connection))
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 raise_file_descriptor_limit (BusContext *context)
677 DBusError error = DBUS_ERROR_INIT;
679 /* we only do this once */
680 if (context->initial_fd_limit != NULL)
683 context->initial_fd_limit = _dbus_rlimit_save_fd_limit (&error);
685 if (context->initial_fd_limit == NULL)
687 bus_context_log (context, DBUS_SYSTEM_LOG_WARNING,
688 "%s: %s", error.name, error.message);
689 dbus_error_free (&error);
693 /* We used to compute a suitable rlimit based on the configured number
694 * of connections, but that breaks down as soon as we allow fd-passing,
695 * because each connection is allowed to pass 64 fds to us, and if
696 * they all did, we'd hit kernel limits. We now hard-code a good
697 * limit that is enough to avoid DoS from anything short of multiple
698 * uids conspiring against us, much like systemd does.
700 if (!_dbus_rlimit_raise_fd_limit (&error))
702 bus_context_log (context, DBUS_SYSTEM_LOG_WARNING,
703 "%s: %s", error.name, error.message);
704 dbus_error_free (&error);
711 process_config_postinit (BusContext *context,
712 BusConfigParser *parser,
715 DBusHashTable *service_context_table;
716 DBusList *watched_dirs = NULL;
718 service_context_table = bus_config_parser_steal_service_context_table (parser);
719 if (!bus_registry_set_service_context_table (context->registry,
720 service_context_table))
726 _dbus_hash_table_unref (service_context_table);
728 /* We need to monitor both the configuration directories and directories
729 * containing .service files.
731 if (!bus_config_parser_get_watched_dirs (parser, &watched_dirs))
737 bus_set_watched_dirs (context, &watched_dirs);
739 _dbus_list_clear (&watched_dirs);
745 bus_context_new (const DBusString *config_file,
746 BusContextFlags flags,
747 DBusPipe *print_addr_pipe,
748 DBusPipe *print_pid_pipe,
749 const DBusString *address,
753 BusConfigParser *parser;
755 _dbus_assert ((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 ||
756 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS) == 0);
758 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
763 if (!dbus_server_allocate_data_slot (&server_data_slot))
769 context = dbus_new0 (BusContext, 1);
775 context->refcount = 1;
777 if (!_dbus_generate_uuid (&context->uuid, error))
780 if (!_dbus_string_copy_data (config_file, &context->config_file))
786 context->loop = _dbus_loop_new ();
787 if (context->loop == NULL)
793 context->watches_enabled = TRUE;
795 context->registry = bus_registry_new (context);
796 if (context->registry == NULL)
802 parser = bus_config_load (config_file, TRUE, NULL, error);
805 _DBUS_ASSERT_ERROR_IS_SET (error);
809 if (!process_config_first_time_only (context, parser, address, flags, error))
811 _DBUS_ASSERT_ERROR_IS_SET (error);
814 if (!process_config_every_time (context, parser, FALSE, error))
816 _DBUS_ASSERT_ERROR_IS_SET (error);
820 /* we need another ref of the server data slot for the context
823 if (!dbus_server_allocate_data_slot (&server_data_slot))
824 _dbus_assert_not_reached ("second ref of server data slot failed");
826 /* Note that we don't know whether the print_addr_pipe is
827 * one of the sockets we're using to listen on, or some
828 * other random thing. But I think the answer is "don't do
831 if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
834 const char *a = bus_context_get_address (context);
837 _dbus_assert (a != NULL);
838 if (!_dbus_string_init (&addr))
844 if (!_dbus_string_append (&addr, a) ||
845 !_dbus_string_append (&addr, "\n"))
847 _dbus_string_free (&addr);
852 bytes = _dbus_string_get_length (&addr);
853 if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
855 /* pipe write returns an error on failure but not short write */
856 if (error != NULL && !dbus_error_is_set (error))
858 dbus_set_error (error, DBUS_ERROR_FAILED,
859 "Printing message bus address: did not write all bytes\n");
861 _dbus_string_free (&addr);
865 if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
866 _dbus_pipe_close (print_addr_pipe, NULL);
868 _dbus_string_free (&addr);
871 context->connections = bus_connections_new (context);
872 if (context->connections == NULL)
878 context->matchmaker = bus_matchmaker_new ();
879 if (context->matchmaker == NULL)
885 /* check user before we fork */
886 if (context->user != NULL)
888 if (!_dbus_verify_daemon_user (context->user))
890 dbus_set_error (error, DBUS_ERROR_FAILED,
891 "Could not get UID and GID for username \"%s\"",
897 /* Now become a daemon if appropriate and write out pid file in any case */
901 if (context->pidfile)
902 _dbus_string_init_const (&u, context->pidfile);
904 if (((flags & BUS_CONTEXT_FLAG_FORK_NEVER) == 0 && context->fork) ||
905 (flags & BUS_CONTEXT_FLAG_FORK_ALWAYS))
907 _dbus_verbose ("Forking and becoming daemon\n");
909 if (!_dbus_become_daemon (context->pidfile ? &u : NULL,
912 context->keep_umask))
914 _DBUS_ASSERT_ERROR_IS_SET (error);
920 _dbus_verbose ("Fork not requested\n");
922 /* Need to write PID file and to PID pipe for ourselves,
923 * not for the child process. This is a no-op if the pidfile
924 * is NULL and print_pid_pipe is NULL.
926 if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
931 _DBUS_ASSERT_ERROR_IS_SET (error);
937 if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
938 !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
939 _dbus_pipe_close (print_pid_pipe, NULL);
941 /* Raise the file descriptor limits before dropping the privileges
944 raise_file_descriptor_limit (context);
946 /* Here we change our credentials if required,
947 * as soon as we've set up our sockets and pidfile.
948 * This must be done before initializing LSMs, so that the netlink
949 * monitoring thread started by avc_init() will not lose CAP_AUDIT_WRITE
950 * when the main thread calls setuid().
951 * https://bugs.freedesktop.org/show_bug.cgi?id=92832
953 if (context->user != NULL)
955 if (!_dbus_change_to_daemon_user (context->user, error))
957 _DBUS_ASSERT_ERROR_IS_SET (error);
962 /* Auditing should be initialized before LSMs, so that the LSMs are able
963 * to log audit-events that happen during their initialization.
965 bus_audit_init (context);
967 if (!bus_selinux_full_init ())
969 bus_context_log (context, DBUS_SYSTEM_LOG_ERROR,
970 "SELinux enabled but D-Bus initialization failed; "
975 if (!bus_apparmor_full_init (error))
977 _DBUS_ASSERT_ERROR_IS_SET (error);
981 if (bus_apparmor_enabled ())
983 /* Only print AppArmor mediation message when syslog support is enabled */
985 bus_context_log (context, DBUS_SYSTEM_LOG_INFO,
986 "AppArmor D-Bus mediation is enabled\n");
989 /* When SELinux is used, this must happen after bus_selinux_full_init()
990 * so that it has access to the access vector cache, which is required
991 * to process <associate/> elements.
992 * http://lists.freedesktop.org/archives/dbus/2008-October/010491.html
994 if (!process_config_postinit (context, parser, error))
996 _DBUS_ASSERT_ERROR_IS_SET (error);
1002 bus_config_parser_unref (parser);
1006 dbus_server_free_data_slot (&server_data_slot);
1012 bus_config_parser_unref (parser);
1013 if (context != NULL)
1014 bus_context_unref (context);
1016 if (server_data_slot >= 0)
1017 dbus_server_free_data_slot (&server_data_slot);
1023 bus_context_get_id (BusContext *context,
1026 return _dbus_uuid_encode (&context->uuid, uuid);
1030 bus_context_reload_config (BusContext *context,
1033 BusConfigParser *parser;
1034 DBusString config_file;
1037 /* Flush the user database cache */
1038 _dbus_flush_caches ();
1041 _dbus_string_init_const (&config_file, context->config_file);
1042 parser = bus_config_load (&config_file, TRUE, NULL, error);
1045 _DBUS_ASSERT_ERROR_IS_SET (error);
1049 if (!process_config_every_time (context, parser, TRUE, error))
1051 _DBUS_ASSERT_ERROR_IS_SET (error);
1054 if (!process_config_postinit (context, parser, error))
1056 _DBUS_ASSERT_ERROR_IS_SET (error);
1061 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Reloaded configuration");
1064 bus_context_log (context, DBUS_SYSTEM_LOG_INFO, "Unable to reload configuration: %s", error->message);
1066 bus_config_parser_unref (parser);
1071 shutdown_server (BusContext *context,
1074 if (server == NULL ||
1075 !dbus_server_get_is_connected (server))
1078 if (!dbus_server_set_watch_functions (server,
1082 _dbus_assert_not_reached ("setting watch functions to NULL failed");
1084 if (!dbus_server_set_timeout_functions (server,
1088 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
1090 dbus_server_disconnect (server);
1094 bus_context_shutdown (BusContext *context)
1098 link = _dbus_list_get_first_link (&context->servers);
1099 while (link != NULL)
1101 shutdown_server (context, link->data);
1103 link = _dbus_list_get_next_link (&context->servers, link);
1108 bus_context_ref (BusContext *context)
1110 _dbus_assert (context->refcount > 0);
1111 context->refcount += 1;
1117 bus_context_unref (BusContext *context)
1119 _dbus_assert (context->refcount > 0);
1120 context->refcount -= 1;
1122 if (context->refcount == 0)
1126 _dbus_verbose ("Finalizing bus context %p\n", context);
1128 bus_context_shutdown (context);
1130 if (context->connections)
1132 bus_connections_unref (context->connections);
1133 context->connections = NULL;
1136 if (context->registry)
1138 bus_registry_unref (context->registry);
1139 context->registry = NULL;
1142 if (context->activation)
1144 bus_activation_unref (context->activation);
1145 context->activation = NULL;
1148 link = _dbus_list_get_first_link (&context->servers);
1149 while (link != NULL)
1151 dbus_server_unref (link->data);
1153 link = _dbus_list_get_next_link (&context->servers, link);
1155 _dbus_list_clear (&context->servers);
1157 if (context->policy)
1159 bus_policy_unref (context->policy);
1160 context->policy = NULL;
1165 _dbus_loop_unref (context->loop);
1166 context->loop = NULL;
1169 if (context->matchmaker)
1171 bus_matchmaker_unref (context->matchmaker);
1172 context->matchmaker = NULL;
1175 dbus_free (context->config_file);
1176 dbus_free (context->log_prefix);
1177 dbus_free (context->type);
1178 dbus_free (context->address);
1179 dbus_free (context->user);
1180 dbus_free (context->servicehelper);
1182 if (context->pidfile)
1185 _dbus_string_init_const (&u, context->pidfile);
1187 /* Deliberately ignore errors here, since there's not much
1188 * we can do about it, and we're exiting anyways.
1190 _dbus_delete_file (&u, NULL);
1192 dbus_free (context->pidfile);
1195 if (context->initial_fd_limit)
1196 _dbus_rlimit_free (context->initial_fd_limit);
1198 dbus_free (context);
1200 dbus_server_free_data_slot (&server_data_slot);
1204 /* type may be NULL */
1206 bus_context_get_type (BusContext *context)
1208 return context->type;
1212 bus_context_get_address (BusContext *context)
1214 return context->address;
1218 bus_context_get_servicehelper (BusContext *context)
1220 return context->servicehelper;
1224 bus_context_get_systemd_activation (BusContext *context)
1226 return context->systemd_activation;
1230 bus_context_get_registry (BusContext *context)
1232 return context->registry;
1236 bus_context_get_connections (BusContext *context)
1238 return context->connections;
1242 bus_context_get_activation (BusContext *context)
1244 return context->activation;
1248 bus_context_get_matchmaker (BusContext *context)
1250 return context->matchmaker;
1254 bus_context_get_loop (BusContext *context)
1256 return context->loop;
1260 bus_context_allow_unix_user (BusContext *context,
1263 return bus_policy_allow_unix_user (context->policy,
1267 /* For now this is never actually called because the default
1268 * DBusConnection behavior of 'same user that owns the bus can connect'
1269 * is all it would do.
1272 bus_context_allow_windows_user (BusContext *context,
1273 const char *windows_sid)
1275 return bus_policy_allow_windows_user (context->policy,
1280 bus_context_get_policy (BusContext *context)
1282 return context->policy;
1286 bus_context_create_client_policy (BusContext *context,
1287 DBusConnection *connection,
1290 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1291 return bus_policy_create_client_policy (context->policy, connection,
1296 bus_context_get_activation_timeout (BusContext *context)
1299 return context->limits.activation_timeout;
1303 bus_context_get_auth_timeout (BusContext *context)
1305 return context->limits.auth_timeout;
1309 bus_context_get_pending_fd_timeout (BusContext *context)
1311 return context->limits.pending_fd_timeout;
1315 bus_context_get_max_completed_connections (BusContext *context)
1317 return context->limits.max_completed_connections;
1321 bus_context_get_max_incomplete_connections (BusContext *context)
1323 return context->limits.max_incomplete_connections;
1327 bus_context_get_max_connections_per_user (BusContext *context)
1329 return context->limits.max_connections_per_user;
1333 bus_context_get_max_pending_activations (BusContext *context)
1335 return context->limits.max_pending_activations;
1339 bus_context_get_max_services_per_connection (BusContext *context)
1341 return context->limits.max_services_per_connection;
1345 bus_context_get_max_match_rules_per_connection (BusContext *context)
1347 return context->limits.max_match_rules_per_connection;
1351 bus_context_get_max_replies_per_connection (BusContext *context)
1353 return context->limits.max_replies_per_connection;
1357 bus_context_get_reply_timeout (BusContext *context)
1359 return context->limits.reply_timeout;
1363 bus_context_get_initial_fd_limit (BusContext *context)
1365 return context->initial_fd_limit;
1369 bus_context_get_using_syslog (BusContext *context)
1371 return context->syslog;
1375 bus_context_log (BusContext *context, DBusSystemLogSeverity severity, const char *msg, ...)
1379 va_start (args, msg);
1381 if (context->log_prefix)
1383 DBusString full_msg;
1385 if (!_dbus_string_init (&full_msg))
1387 if (!_dbus_string_append (&full_msg, context->log_prefix))
1389 if (!_dbus_string_append_printf_valist (&full_msg, msg, args))
1392 _dbus_log (severity, "%s", _dbus_string_get_const_data (&full_msg));
1394 _dbus_string_free (&full_msg);
1397 _dbus_logv (severity, msg, args);
1403 static inline const char *
1404 nonnull (const char *maybe_null,
1405 const char *if_null)
1407 return (maybe_null ? maybe_null : if_null);
1411 bus_context_log_literal (BusContext *context,
1412 DBusSystemLogSeverity severity,
1415 _dbus_log (severity, "%s%s", nonnull (context->log_prefix, ""), msg);
1419 bus_context_log_and_set_error (BusContext *context,
1420 DBusSystemLogSeverity severity,
1426 DBusError stack_error = DBUS_ERROR_INIT;
1429 va_start (args, msg);
1430 _dbus_set_error_valist (&stack_error, name, msg, args);
1433 /* If we hit OOM while setting the error, this will syslog "out of memory"
1434 * which is itself an indication that something is seriously wrong */
1435 bus_context_log_literal (context, DBUS_SYSTEM_LOG_SECURITY,
1436 stack_error.message);
1438 dbus_move_error (&stack_error, error);
1442 * Log something about a message, usually that it was rejected.
1445 complain_about_message (BusContext *context,
1446 const char *error_name,
1447 const char *complaint,
1449 DBusMessage *message,
1450 DBusConnection *sender,
1451 DBusConnection *proposed_recipient,
1452 dbus_bool_t requested_reply,
1456 DBusError stack_error = DBUS_ERROR_INIT;
1457 const char *sender_name;
1458 const char *sender_loginfo;
1459 const char *proposed_recipient_loginfo;
1461 if (error == NULL && !log)
1466 sender_name = bus_connection_get_name (sender);
1467 sender_loginfo = bus_connection_get_loginfo (sender);
1471 sender_name = "(unset)";
1472 sender_loginfo = "(bus)";
1475 if (proposed_recipient != NULL)
1476 proposed_recipient_loginfo = bus_connection_get_loginfo (proposed_recipient);
1478 proposed_recipient_loginfo = "bus";
1480 dbus_set_error (&stack_error, error_name,
1481 "%s, %d matched rules; type=\"%s\", sender=\"%s\" (%s) "
1482 "interface=\"%s\" member=\"%s\" error name=\"%s\" "
1483 "requested_reply=\"%d\" destination=\"%s\" (%s)",
1486 dbus_message_type_to_string (dbus_message_get_type (message)),
1489 nonnull (dbus_message_get_interface (message), "(unset)"),
1490 nonnull (dbus_message_get_member (message), "(unset)"),
1491 nonnull (dbus_message_get_error_name (message), "(unset)"),
1493 nonnull (dbus_message_get_destination (message), DBUS_SERVICE_DBUS),
1494 proposed_recipient_loginfo);
1496 /* If we hit OOM while setting the error, this will syslog "out of memory"
1497 * which is itself an indication that something is seriously wrong */
1499 bus_context_log_literal (context, DBUS_SYSTEM_LOG_SECURITY,
1500 stack_error.message);
1502 dbus_move_error (&stack_error, error);
1506 * addressed_recipient is the recipient specified in the message.
1508 * proposed_recipient is the recipient we're considering sending
1509 * to right this second, and may be an eavesdropper.
1511 * sender is the sender of the message.
1513 * NULL for sender definitely means the bus driver.
1515 * NULL for proposed_recipient may mean the bus driver, or may mean
1516 * we are checking whether service-activation is allowed as a first
1517 * pass before all details of the activated service are known.
1519 * NULL for addressed_recipient may mean the bus driver, or may mean
1520 * no destination was specified in the message (e.g. a signal).
1523 bus_context_check_security_policy (BusContext *context,
1524 BusTransaction *transaction,
1525 DBusConnection *sender,
1526 DBusConnection *addressed_recipient,
1527 DBusConnection *proposed_recipient,
1528 DBusMessage *message,
1529 BusActivationEntry *activation_entry,
1532 const char *src, *dest;
1533 BusClientPolicy *sender_policy;
1534 BusClientPolicy *recipient_policy;
1535 dbus_int32_t toggles;
1538 dbus_bool_t requested_reply;
1540 type = dbus_message_get_type (message);
1541 src = dbus_message_get_sender (message);
1542 dest = dbus_message_get_destination (message);
1544 /* dispatch.c was supposed to ensure these invariants */
1545 _dbus_assert (dest != NULL ||
1546 type == DBUS_MESSAGE_TYPE_SIGNAL ||
1547 (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1548 _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
1549 addressed_recipient != NULL ||
1550 activation_entry != NULL ||
1551 strcmp (dest, DBUS_SERVICE_DBUS) == 0);
1555 case DBUS_MESSAGE_TYPE_METHOD_CALL:
1556 case DBUS_MESSAGE_TYPE_SIGNAL:
1557 case DBUS_MESSAGE_TYPE_METHOD_RETURN:
1558 case DBUS_MESSAGE_TYPE_ERROR:
1562 _dbus_verbose ("security check disallowing message of unknown type %d\n",
1565 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1566 "Message bus will not accept messages of unknown type\n");
1571 requested_reply = FALSE;
1575 if (bus_connection_is_active (sender))
1577 sender_policy = bus_connection_get_policy (sender);
1578 _dbus_assert (sender_policy != NULL);
1580 /* Fill in requested_reply variable with TRUE if this is a
1581 * reply and the reply was pending.
1583 if (dbus_message_get_reply_serial (message) != 0)
1585 if (proposed_recipient != NULL /* not to the bus driver */ &&
1586 addressed_recipient == proposed_recipient /* not eavesdropping */)
1590 dbus_error_init (&error2);
1591 requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
1593 sender, addressed_recipient, message,
1595 if (dbus_error_is_set (&error2))
1597 dbus_move_error (&error2, error);
1605 sender_policy = NULL;
1608 /* First verify the SELinux access controls. If allowed then
1609 * go on with the standard checks.
1611 if (!bus_selinux_allows_send (sender, proposed_recipient,
1612 dbus_message_type_to_string (dbus_message_get_type (message)),
1613 dbus_message_get_interface (message),
1614 dbus_message_get_member (message),
1615 dbus_message_get_error_name (message),
1616 dest ? dest : DBUS_SERVICE_DBUS,
1620 if (error != NULL && !dbus_error_is_set (error))
1622 /* don't syslog this, just set the error: avc_has_perm should
1623 * have already written to either the audit log or syslog */
1624 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1625 "An SELinux policy prevents this sender from sending this "
1626 "message to this recipient",
1627 0, message, sender, proposed_recipient, FALSE, FALSE, error);
1628 _dbus_verbose ("SELinux security check denying send to service\n");
1634 /* next verify AppArmor access controls. If allowed then
1635 * go on with the standard checks.
1637 if (!bus_apparmor_allows_send (sender, proposed_recipient,
1639 bus_context_get_type (context),
1640 dbus_message_get_type (message),
1641 dbus_message_get_path (message),
1642 dbus_message_get_interface (message),
1643 dbus_message_get_member (message),
1644 dbus_message_get_error_name (message),
1645 dest ? dest : DBUS_SERVICE_DBUS,
1646 src ? src : DBUS_SERVICE_DBUS,
1651 if (!bus_connection_is_active (sender))
1653 /* Policy for inactive connections is that they can only send
1654 * the hello message to the bus driver
1656 if (proposed_recipient == NULL &&
1657 dbus_message_is_method_call (message,
1658 DBUS_INTERFACE_DBUS,
1661 _dbus_verbose ("security check allowing %s message\n",
1667 _dbus_verbose ("security check disallowing non-%s message\n",
1670 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1671 "Client tried to send a message other than %s without being registered",
1680 sender_policy = NULL;
1682 /* If the sender is the bus driver, we assume any reply was a
1683 * requested reply as bus driver won't send bogus ones
1685 if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
1686 dbus_message_get_reply_serial (message) != 0)
1687 requested_reply = TRUE;
1690 _dbus_assert ((sender != NULL && sender_policy != NULL) ||
1691 (sender == NULL && sender_policy == NULL));
1693 if (proposed_recipient != NULL)
1695 /* only the bus driver can send to an inactive recipient (as it
1696 * owns no services, so other apps can't address it). Inactive
1697 * recipients can receive any message.
1699 if (bus_connection_is_active (proposed_recipient))
1701 recipient_policy = bus_connection_get_policy (proposed_recipient);
1702 _dbus_assert (recipient_policy != NULL);
1704 else if (sender == NULL)
1706 _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
1707 recipient_policy = NULL;
1711 _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus");
1712 recipient_policy = NULL;
1716 recipient_policy = NULL;
1718 _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
1719 (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
1720 (proposed_recipient == NULL && recipient_policy == NULL));
1723 if (sender_policy &&
1724 !bus_client_policy_check_can_send (sender_policy,
1728 message, &toggles, &log))
1730 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1731 "Rejected send message", toggles,
1732 message, sender, proposed_recipient, requested_reply,
1733 (addressed_recipient == proposed_recipient), error);
1734 _dbus_verbose ("security policy disallowing message due to sender policy\n");
1740 /* We want to drop this message, and are only not doing so for backwards
1742 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1743 "Would reject message", toggles,
1744 message, sender, proposed_recipient, requested_reply,
1748 if (recipient_policy &&
1749 !bus_client_policy_check_can_receive (recipient_policy,
1753 addressed_recipient, proposed_recipient,
1756 complain_about_message (context, DBUS_ERROR_ACCESS_DENIED,
1757 "Rejected receive message", toggles,
1758 message, sender, proposed_recipient, requested_reply,
1759 (addressed_recipient == proposed_recipient), error);
1760 _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1764 /* See if limits on size have been exceeded */
1765 if (proposed_recipient &&
1766 ((dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) ||
1767 (dbus_connection_get_outgoing_unix_fds (proposed_recipient) > context->limits.max_outgoing_unix_fds)))
1769 complain_about_message (context, DBUS_ERROR_LIMITS_EXCEEDED,
1770 "Rejected: destination has a full message queue",
1771 0, message, sender, proposed_recipient, requested_reply, TRUE,
1773 _dbus_verbose ("security policy disallowing message due to full message queue\n");
1777 /* Record that we will allow a reply here in the future (don't
1778 * bother if the recipient is the bus or this is an eavesdropping
1779 * connection). Only the addressed recipient may reply.
1781 * This isn't done for activation attempts because they have no addressed
1782 * or proposed recipient; when we check whether to actually deliver the
1783 * message, later, we'll record the reply expectation at that point.
1785 if (type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
1787 addressed_recipient &&
1788 addressed_recipient == proposed_recipient && /* not eavesdropping */
1789 !bus_connections_expect_reply (bus_connection_get_connections (sender),
1791 sender, addressed_recipient,
1794 _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
1798 _dbus_verbose ("security policy allowing message\n");
1803 bus_context_check_all_watches (BusContext *context)
1806 dbus_bool_t enabled = TRUE;
1808 if (bus_connections_get_n_incomplete (context->connections) >=
1809 bus_context_get_max_incomplete_connections (context))
1814 if (context->watches_enabled == enabled)
1817 context->watches_enabled = enabled;
1819 for (link = _dbus_list_get_first_link (&context->servers);
1821 link = _dbus_list_get_next_link (&context->servers, link))
1823 /* A BusContext might contains several DBusServer (if there are
1824 * several <listen> configuration items) and a DBusServer might
1825 * contain several DBusWatch in its DBusWatchList (if getaddrinfo
1826 * returns several addresses on a dual IPv4-IPv6 stack or if
1827 * systemd passes several fds).
1828 * We want to enable/disable them all.
1830 DBusServer *server = link->data;
1831 _dbus_server_toggle_all_watches (server, enabled);