/* -*- mode: C; c-file-style: "gnu" -*- */ /* bus.c message bus context object * * Copyright (C) 2003, 2004 Red Hat, Inc. * * Licensed under the Academic Free License version 2.1 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include "bus.h" #include "activation.h" #include "connection.h" #include "services.h" #include "utils.h" #include "policy.h" #include "config-parser.h" #include "signals.h" #include "selinux.h" #include "dir-watch.h" #include #include #include struct BusContext { int refcount; char *config_file; char *type; char *address; char *pidfile; char *user; DBusLoop *loop; DBusList *servers; BusConnections *connections; BusActivation *activation; BusRegistry *registry; BusPolicy *policy; BusMatchmaker *matchmaker; DBusUserDatabase *user_database; BusLimits limits; unsigned int fork : 1; }; static dbus_int32_t server_data_slot = -1; typedef struct { BusContext *context; } BusServerData; #define BUS_SERVER_DATA(server) (dbus_server_get_data ((server), server_data_slot)) static BusContext* server_get_context (DBusServer *server) { BusContext *context; BusServerData *bd; if (!dbus_server_allocate_data_slot (&server_data_slot)) return NULL; bd = BUS_SERVER_DATA (server); if (bd == NULL) { dbus_server_free_data_slot (&server_data_slot); return NULL; } context = bd->context; dbus_server_free_data_slot (&server_data_slot); return context; } static dbus_bool_t server_watch_callback (DBusWatch *watch, unsigned int condition, void *data) { /* FIXME this can be done in dbus-mainloop.c * if the code in activation.c for the babysitter * watch handler is fixed. */ return dbus_watch_handle (watch, condition); } static dbus_bool_t add_server_watch (DBusWatch *watch, void *data) { DBusServer *server = data; BusContext *context; context = server_get_context (server); return _dbus_loop_add_watch (context->loop, watch, server_watch_callback, server, NULL); } static void remove_server_watch (DBusWatch *watch, void *data) { DBusServer *server = data; BusContext *context; context = server_get_context (server); _dbus_loop_remove_watch (context->loop, watch, server_watch_callback, server); } static void server_timeout_callback (DBusTimeout *timeout, void *data) { /* can return FALSE on OOM but we just let it fire again later */ dbus_timeout_handle (timeout); } static dbus_bool_t add_server_timeout (DBusTimeout *timeout, void *data) { DBusServer *server = data; BusContext *context; context = server_get_context (server); return _dbus_loop_add_timeout (context->loop, timeout, server_timeout_callback, server, NULL); } static void remove_server_timeout (DBusTimeout *timeout, void *data) { DBusServer *server = data; BusContext *context; context = server_get_context (server); _dbus_loop_remove_timeout (context->loop, timeout, server_timeout_callback, server); } static void new_connection_callback (DBusServer *server, DBusConnection *new_connection, void *data) { BusContext *context = data; if (!bus_connections_setup_connection (context->connections, new_connection)) { _dbus_verbose ("No memory to setup new connection\n"); /* if we don't do this, it will get unref'd without * being disconnected... kind of strange really * that we have to do this, people won't get it right * in general. */ dbus_connection_close (new_connection); } dbus_connection_set_max_received_size (new_connection, context->limits.max_incoming_bytes); dbus_connection_set_max_message_size (new_connection, context->limits.max_message_size); /* on OOM, we won't have ref'd the connection so it will die. */ } static void free_server_data (void *data) { BusServerData *bd = data; dbus_free (bd); } static dbus_bool_t setup_server (BusContext *context, DBusServer *server, char **auth_mechanisms, DBusError *error) { BusServerData *bd; bd = dbus_new0 (BusServerData, 1); if (!dbus_server_set_data (server, server_data_slot, bd, free_server_data)) { dbus_free (bd); BUS_SET_OOM (error); return FALSE; } bd->context = context; if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms)) { BUS_SET_OOM (error); return FALSE; } dbus_server_set_new_connection_function (server, new_connection_callback, context, NULL); if (!dbus_server_set_watch_functions (server, add_server_watch, remove_server_watch, NULL, server, NULL)) { BUS_SET_OOM (error); return FALSE; } if (!dbus_server_set_timeout_functions (server, add_server_timeout, remove_server_timeout, NULL, server, NULL)) { BUS_SET_OOM (error); return FALSE; } return TRUE; } /* This code only gets executed the first time the config files are parsed. It is not executed when config files are reloaded.*/ static dbus_bool_t process_config_first_time_only (BusContext *context, BusConfigParser *parser, DBusError *error) { DBusList *link; DBusList **addresses; const char *user, *pidfile; char **auth_mechanisms; DBusList **auth_mechanisms_list; int len; dbus_bool_t retval; _DBUS_ASSERT_ERROR_IS_CLEAR (error); retval = FALSE; auth_mechanisms = NULL; /* Check for an existing pid file. Of course this is a race; * we'd have to use fcntl() locks on the pid file to * avoid that. But we want to check for the pid file * before overwriting any existing sockets, etc. */ pidfile = bus_config_parser_get_pidfile (parser); if (pidfile != NULL) { DBusString u; DBusStat stbuf; _dbus_string_init_const (&u, pidfile); if (_dbus_stat (&u, &stbuf, NULL)) { dbus_set_error (error, DBUS_ERROR_FAILED, "The pid file \"%s\" exists, if the message bus is not running, remove this file", pidfile); goto failed; } } /* keep around the pid filename so we can delete it later */ context->pidfile = _dbus_strdup (pidfile); /* Build an array of auth mechanisms */ auth_mechanisms_list = bus_config_parser_get_mechanisms (parser); len = _dbus_list_get_length (auth_mechanisms_list); if (len > 0) { int i; auth_mechanisms = dbus_new0 (char*, len + 1); if (auth_mechanisms == NULL) { BUS_SET_OOM (error); goto failed; } i = 0; link = _dbus_list_get_first_link (auth_mechanisms_list); while (link != NULL) { auth_mechanisms[i] = _dbus_strdup (link->data); if (auth_mechanisms[i] == NULL) { BUS_SET_OOM (error); goto failed; } link = _dbus_list_get_next_link (auth_mechanisms_list, link); } } else { auth_mechanisms = NULL; } /* Listen on our addresses */ addresses = bus_config_parser_get_addresses (parser); link = _dbus_list_get_first_link (addresses); while (link != NULL) { DBusServer *server; server = dbus_server_listen (link->data, error); if (server == NULL) { _DBUS_ASSERT_ERROR_IS_SET (error); goto failed; } else if (!setup_server (context, server, auth_mechanisms, error)) { _DBUS_ASSERT_ERROR_IS_SET (error); goto failed; } if (!_dbus_list_append (&context->servers, server)) { BUS_SET_OOM (error); goto failed; } link = _dbus_list_get_next_link (addresses, link); } /* note that type may be NULL */ context->type = _dbus_strdup (bus_config_parser_get_type (parser)); if (bus_config_parser_get_type (parser) != NULL && context->type == NULL) { BUS_SET_OOM (error); goto failed; } user = bus_config_parser_get_user (parser); if (user != NULL) { context->user = _dbus_strdup (user); if (context->user == NULL) { BUS_SET_OOM (error); goto failed; } } context->fork = bus_config_parser_get_fork (parser); _DBUS_ASSERT_ERROR_IS_CLEAR (error); retval = TRUE; failed: dbus_free_string_array (auth_mechanisms); return retval; } /* This code gets executed every time the config files are parsed: both during BusContext construction and on reloads. */ static dbus_bool_t process_config_every_time (BusContext *context, BusConfigParser *parser, dbus_bool_t is_reload, DBusError *error) { DBusString full_address; DBusList *link; dbus_bool_t retval; _DBUS_ASSERT_ERROR_IS_CLEAR (error); retval = FALSE; if (!_dbus_string_init (&full_address)) { BUS_SET_OOM (error); return FALSE; } /* get our limits and timeout lengths */ bus_config_parser_get_limits (parser, &context->limits); context->policy = bus_config_parser_steal_policy (parser); _dbus_assert (context->policy != NULL); /* We have to build the address backward, so that * later in the config file have priority */ link = _dbus_list_get_last_link (&context->servers); while (link != NULL) { char *addr; addr = dbus_server_get_address (link->data); if (addr == NULL) { BUS_SET_OOM (error); goto failed; } if (_dbus_string_get_length (&full_address) > 0) { if (!_dbus_string_append (&full_address, ";")) { BUS_SET_OOM (error); goto failed; } } if (!_dbus_string_append (&full_address, addr)) { BUS_SET_OOM (error); goto failed; } dbus_free (addr); link = _dbus_list_get_prev_link (&context->servers, link); } if (is_reload) dbus_free (context->address); if (!_dbus_string_copy_data (&full_address, &context->address)) { BUS_SET_OOM (error); goto failed; } /* Create activation subsystem */ if (is_reload) bus_activation_unref (context->activation); context->activation = bus_activation_new (context, &full_address, bus_config_parser_get_service_dirs (parser), error); if (context->activation == NULL) { _DBUS_ASSERT_ERROR_IS_SET (error); goto failed; } /* Drop existing conf-dir watches (if applicable) */ if (is_reload) bus_drop_all_directory_watches (); _DBUS_ASSERT_ERROR_IS_CLEAR (error); retval = TRUE; failed: _dbus_string_free (&full_address); return retval; } static dbus_bool_t process_config_postinit (BusContext *context, BusConfigParser *parser, DBusError *error) { DBusHashTable *service_context_table; service_context_table = bus_config_parser_steal_service_context_table (parser); if (!bus_registry_set_service_context_table (context->registry, service_context_table)) { BUS_SET_OOM (error); return FALSE; } _dbus_hash_table_unref (service_context_table); /* Watch all conf directories */ _dbus_list_foreach (bus_config_parser_get_conf_dirs (parser), (DBusForeachFunction) bus_watch_directory, NULL); return TRUE; } BusContext* bus_context_new (const DBusString *config_file, ForceForkSetting force_fork, int print_addr_fd, int print_pid_fd, DBusError *error) { BusContext *context; BusConfigParser *parser; _DBUS_ASSERT_ERROR_IS_CLEAR (error); context = NULL; parser = NULL; if (!dbus_server_allocate_data_slot (&server_data_slot)) { BUS_SET_OOM (error); return NULL; } context = dbus_new0 (BusContext, 1); if (context == NULL) { BUS_SET_OOM (error); goto failed; } context->refcount = 1; if (!_dbus_string_copy_data (config_file, &context->config_file)) { BUS_SET_OOM (error); goto failed; } context->loop = _dbus_loop_new (); if (context->loop == NULL) { BUS_SET_OOM (error); goto failed; } context->registry = bus_registry_new (context); if (context->registry == NULL) { BUS_SET_OOM (error); goto failed; } parser = bus_config_load (config_file, TRUE, NULL, error); if (parser == NULL) { _DBUS_ASSERT_ERROR_IS_SET (error); goto failed; } if (!process_config_first_time_only (context, parser, error)) { _DBUS_ASSERT_ERROR_IS_SET (error); goto failed; } if (!process_config_every_time (context, parser, FALSE, error)) { _DBUS_ASSERT_ERROR_IS_SET (error); goto failed; } /* we need another ref of the server data slot for the context * to own */ if (!dbus_server_allocate_data_slot (&server_data_slot)) _dbus_assert_not_reached ("second ref of server data slot failed"); context->user_database = _dbus_user_database_new (); if (context->user_database == NULL) { BUS_SET_OOM (error); goto failed; } /* Note that we don't know whether the print_addr_fd is * one of the sockets we're using to listen on, or some * other random thing. But I think the answer is "don't do * that then" */ if (print_addr_fd >= 0) { DBusString addr; const char *a = bus_context_get_address (context); int bytes; _dbus_assert (a != NULL); if (!_dbus_string_init (&addr)) { BUS_SET_OOM (error); goto failed; } if (!_dbus_string_append (&addr, a) || !_dbus_string_append (&addr, "\n")) { _dbus_string_free (&addr); BUS_SET_OOM (error); goto failed; } bytes = _dbus_string_get_length (&addr); if (_dbus_write (print_addr_fd, &addr, 0, bytes) != bytes) { dbus_set_error (error, DBUS_ERROR_FAILED, "Printing message bus address: %s\n", _dbus_strerror (errno)); _dbus_string_free (&addr); goto failed; } if (print_addr_fd > 2) _dbus_close (print_addr_fd, NULL); _dbus_string_free (&addr); } context->connections = bus_connections_new (context); if (context->connections == NULL) { BUS_SET_OOM (error); goto failed; } context->matchmaker = bus_matchmaker_new (); if (context->matchmaker == NULL) { BUS_SET_OOM (error); goto failed; } /* Now become a daemon if appropriate */ if ((force_fork != FORK_NEVER && context->fork) || force_fork == FORK_ALWAYS) { DBusString u; if (context->pidfile) _dbus_string_init_const (&u, context->pidfile); if (!_dbus_become_daemon (context->pidfile ? &u : NULL, print_pid_fd, error)) { _DBUS_ASSERT_ERROR_IS_SET (error); goto failed; } } else { /* Need to write PID file for ourselves, not for the child process */ if (context->pidfile != NULL) { DBusString u; _dbus_string_init_const (&u, context->pidfile); if (!_dbus_write_pid_file (&u, _dbus_getpid (), error)) { _DBUS_ASSERT_ERROR_IS_SET (error); goto failed; } } } /* Write PID if requested */ if (print_pid_fd >= 0) { DBusString pid; int bytes; if (!_dbus_string_init (&pid)) { BUS_SET_OOM (error); goto failed; } if (!_dbus_string_append_int (&pid, _dbus_getpid ()) || !_dbus_string_append (&pid, "\n")) { _dbus_string_free (&pid); BUS_SET_OOM (error); goto failed; } bytes = _dbus_string_get_length (&pid); if (_dbus_write (print_pid_fd, &pid, 0, bytes) != bytes) { dbus_set_error (error, DBUS_ERROR_FAILED, "Printing message bus PID: %s\n", _dbus_strerror (errno)); _dbus_string_free (&pid); goto failed; } if (print_pid_fd > 2) _dbus_close (print_pid_fd, NULL); _dbus_string_free (&pid); } if (!bus_selinux_full_init ()) { _dbus_warn ("SELinux initialization failed\n"); } if (!process_config_postinit (context, parser, error)) { _DBUS_ASSERT_ERROR_IS_SET (error); goto failed; } if (parser != NULL) { bus_config_parser_unref (parser); parser = NULL; } /* Here we change our credentials if required, * as soon as we've set up our sockets and pidfile */ if (context->user != NULL) { DBusCredentials creds; DBusString u; _dbus_string_init_const (&u, context->user); if (!_dbus_credentials_from_username (&u, &creds) || creds.uid < 0 || creds.gid < 0) { dbus_set_error (error, DBUS_ERROR_FAILED, "Could not get UID and GID for username \"%s\"", context->user); goto failed; } if (!_dbus_change_identity (creds.uid, creds.gid, error)) { _DBUS_ASSERT_ERROR_IS_SET (error); goto failed; } } dbus_server_free_data_slot (&server_data_slot); return context; failed: if (parser != NULL) bus_config_parser_unref (parser); if (context != NULL) bus_context_unref (context); if (server_data_slot >= 0) dbus_server_free_data_slot (&server_data_slot); return NULL; } dbus_bool_t bus_context_reload_config (BusContext *context, DBusError *error) { BusConfigParser *parser; DBusString config_file; dbus_bool_t ret; ret = FALSE; _dbus_string_init_const (&config_file, context->config_file); parser = bus_config_load (&config_file, TRUE, NULL, error); if (parser == NULL) { _DBUS_ASSERT_ERROR_IS_SET (error); goto failed; } if (!process_config_every_time (context, parser, TRUE, error)) { _DBUS_ASSERT_ERROR_IS_SET (error); goto failed; } if (!process_config_postinit (context, parser, error)) { _DBUS_ASSERT_ERROR_IS_SET (error); goto failed; } ret = TRUE; failed: if (parser != NULL) bus_config_parser_unref (parser); return ret; } static void shutdown_server (BusContext *context, DBusServer *server) { if (server == NULL || !dbus_server_get_is_connected (server)) return; if (!dbus_server_set_watch_functions (server, NULL, NULL, NULL, context, NULL)) _dbus_assert_not_reached ("setting watch functions to NULL failed"); if (!dbus_server_set_timeout_functions (server, NULL, NULL, NULL, context, NULL)) _dbus_assert_not_reached ("setting timeout functions to NULL failed"); dbus_server_disconnect (server); } void bus_context_shutdown (BusContext *context) { DBusList *link; link = _dbus_list_get_first_link (&context->servers); while (link != NULL) { shutdown_server (context, link->data); link = _dbus_list_get_next_link (&context->servers, link); } } BusContext * bus_context_ref (BusContext *context) { _dbus_assert (context->refcount > 0); context->refcount += 1; return context; } void bus_context_unref (BusContext *context) { _dbus_assert (context->refcount > 0); context->refcount -= 1; if (context->refcount == 0) { DBusList *link; _dbus_verbose ("Finalizing bus context %p\n", context); bus_context_shutdown (context); if (context->connections) { bus_connections_unref (context->connections); context->connections = NULL; } if (context->registry) { bus_registry_unref (context->registry); context->registry = NULL; } if (context->activation) { bus_activation_unref (context->activation); context->activation = NULL; } link = _dbus_list_get_first_link (&context->servers); while (link != NULL) { dbus_server_unref (link->data); link = _dbus_list_get_next_link (&context->servers, link); } _dbus_list_clear (&context->servers); if (context->policy) { bus_policy_unref (context->policy); context->policy = NULL; } if (context->loop) { _dbus_loop_unref (context->loop); context->loop = NULL; } if (context->matchmaker) { bus_matchmaker_unref (context->matchmaker); context->matchmaker = NULL; } dbus_free (context->config_file); dbus_free (context->type); dbus_free (context->address); dbus_free (context->user); if (context->pidfile) { DBusString u; _dbus_string_init_const (&u, context->pidfile); /* Deliberately ignore errors here, since there's not much * we can do about it, and we're exiting anyways. */ _dbus_delete_file (&u, NULL); dbus_free (context->pidfile); } if (context->user_database != NULL) _dbus_user_database_unref (context->user_database); dbus_free (context); dbus_server_free_data_slot (&server_data_slot); } } /* type may be NULL */ const char* bus_context_get_type (BusContext *context) { return context->type; } const char* bus_context_get_address (BusContext *context) { return context->address; } BusRegistry* bus_context_get_registry (BusContext *context) { return context->registry; } BusConnections* bus_context_get_connections (BusContext *context) { return context->connections; } BusActivation* bus_context_get_activation (BusContext *context) { return context->activation; } BusMatchmaker* bus_context_get_matchmaker (BusContext *context) { return context->matchmaker; } DBusLoop* bus_context_get_loop (BusContext *context) { return context->loop; } DBusUserDatabase* bus_context_get_user_database (BusContext *context) { return context->user_database; } dbus_bool_t bus_context_allow_user (BusContext *context, unsigned long uid) { return bus_policy_allow_user (context->policy, context->user_database, uid); } BusPolicy * bus_context_get_policy (BusContext *context) { return context->policy; } BusClientPolicy* bus_context_create_client_policy (BusContext *context, DBusConnection *connection, DBusError *error) { _DBUS_ASSERT_ERROR_IS_CLEAR (error); return bus_policy_create_client_policy (context->policy, connection, error); } int bus_context_get_activation_timeout (BusContext *context) { return context->limits.activation_timeout; } int bus_context_get_auth_timeout (BusContext *context) { return context->limits.auth_timeout; } int bus_context_get_max_completed_connections (BusContext *context) { return context->limits.max_completed_connections; } int bus_context_get_max_incomplete_connections (BusContext *context) { return context->limits.max_incomplete_connections; } int bus_context_get_max_connections_per_user (BusContext *context) { return context->limits.max_connections_per_user; } int bus_context_get_max_pending_activations (BusContext *context) { return context->limits.max_pending_activations; } int bus_context_get_max_services_per_connection (BusContext *context) { return context->limits.max_services_per_connection; } int bus_context_get_max_match_rules_per_connection (BusContext *context) { return context->limits.max_match_rules_per_connection; } int bus_context_get_max_replies_per_connection (BusContext *context) { return context->limits.max_replies_per_connection; } int bus_context_get_reply_timeout (BusContext *context) { return context->limits.reply_timeout; } /* * addressed_recipient is the recipient specified in the message. * * proposed_recipient is the recipient we're considering sending * to right this second, and may be an eavesdropper. * * sender is the sender of the message. * * NULL for proposed_recipient or sender definitely means the bus driver. * * NULL for addressed_recipient may mean the bus driver, or may mean * no destination was specified in the message (e.g. a signal). */ dbus_bool_t bus_context_check_security_policy (BusContext *context, BusTransaction *transaction, DBusConnection *sender, DBusConnection *addressed_recipient, DBusConnection *proposed_recipient, DBusMessage *message, DBusError *error) { BusClientPolicy *sender_policy; BusClientPolicy *recipient_policy; int type; dbus_bool_t requested_reply; type = dbus_message_get_type (message); /* dispatch.c was supposed to ensure these invariants */ _dbus_assert (dbus_message_get_destination (message) != NULL || type == DBUS_MESSAGE_TYPE_SIGNAL || (sender == NULL && !bus_connection_is_active (proposed_recipient))); _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL || addressed_recipient != NULL || strcmp (dbus_message_get_destination (message), DBUS_SERVICE_DBUS) == 0); switch (type) { case DBUS_MESSAGE_TYPE_METHOD_CALL: case DBUS_MESSAGE_TYPE_SIGNAL: case DBUS_MESSAGE_TYPE_METHOD_RETURN: case DBUS_MESSAGE_TYPE_ERROR: break; default: _dbus_verbose ("security check disallowing message of unknown type %d\n", type); dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED, "Message bus will not accept messages of unknown type\n"); return FALSE; } requested_reply = FALSE; if (sender != NULL) { const char *dest; dest = dbus_message_get_destination (message); /* First verify the SELinux access controls. If allowed then * go on with the standard checks. */ if (!bus_selinux_allows_send (sender, proposed_recipient, dbus_message_type_to_string (dbus_message_get_type (message)), dbus_message_get_interface (message), dbus_message_get_member (message), dbus_message_get_error_name (message), dest ? dest : DBUS_SERVICE_DBUS, error)) { if (dbus_error_is_set (error) && dbus_error_has_name (error, DBUS_ERROR_NO_MEMORY)) { return FALSE; } dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED, "An SELinux policy prevents this sender " "from sending this message to this recipient " "(rejected message had interface \"%s\" " "member \"%s\" error name \"%s\" destination \"%s\")", dbus_message_get_interface (message) ? dbus_message_get_interface (message) : "(unset)", dbus_message_get_member (message) ? dbus_message_get_member (message) : "(unset)", dbus_message_get_error_name (message) ? dbus_message_get_error_name (message) : "(unset)", dest ? dest : DBUS_SERVICE_DBUS); _dbus_verbose ("SELinux security check denying send to service\n"); return FALSE; } if (bus_connection_is_active (sender)) { sender_policy = bus_connection_get_policy (sender); _dbus_assert (sender_policy != NULL); /* Fill in requested_reply variable with TRUE if this is a * reply and the reply was pending. */ if (dbus_message_get_reply_serial (message) != 0) { if (proposed_recipient != NULL /* not to the bus driver */ && addressed_recipient == proposed_recipient /* not eavesdropping */) { DBusError error2; dbus_error_init (&error2); requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender), transaction, sender, addressed_recipient, message, &error2); if (dbus_error_is_set (&error2)) { dbus_move_error (&error2, error); return FALSE; } } } } else { /* Policy for inactive connections is that they can only send * the hello message to the bus driver */ if (proposed_recipient == NULL && dbus_message_is_method_call (message, DBUS_INTERFACE_DBUS, "Hello")) { _dbus_verbose ("security check allowing %s message\n", "Hello"); return TRUE; } else { _dbus_verbose ("security check disallowing non-%s message\n", "Hello"); dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED, "Client tried to send a message other than %s without being registered", "Hello"); return FALSE; } } } else { sender_policy = NULL; /* If the sender is the bus driver, we assume any reply was a * requested reply as bus driver won't send bogus ones */ if (addressed_recipient == proposed_recipient /* not eavesdropping */ && dbus_message_get_reply_serial (message) != 0) requested_reply = TRUE; } _dbus_assert ((sender != NULL && sender_policy != NULL) || (sender == NULL && sender_policy == NULL)); if (proposed_recipient != NULL) { /* only the bus driver can send to an inactive recipient (as it * owns no services, so other apps can't address it). Inactive * recipients can receive any message. */ if (bus_connection_is_active (proposed_recipient)) { recipient_policy = bus_connection_get_policy (proposed_recipient); _dbus_assert (recipient_policy != NULL); } else if (sender == NULL) { _dbus_verbose ("security check using NULL recipient policy for message from bus\n"); recipient_policy = NULL; } else { _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus\n"); recipient_policy = NULL; } } else recipient_policy = NULL; _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) || (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) || (proposed_recipient == NULL && recipient_policy == NULL)); if (sender_policy && !bus_client_policy_check_can_send (sender_policy, context->registry, requested_reply, proposed_recipient, message)) { const char *dest; dest = dbus_message_get_destination (message); dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED, "A security policy in place prevents this sender " "from sending this message to this recipient, " "see message bus configuration file (rejected message " "had interface \"%s\" member \"%s\" error name \"%s\" destination \"%s\")", dbus_message_get_interface (message) ? dbus_message_get_interface (message) : "(unset)", dbus_message_get_member (message) ? dbus_message_get_member (message) : "(unset)", dbus_message_get_error_name (message) ? dbus_message_get_error_name (message) : "(unset)", dest ? dest : DBUS_SERVICE_DBUS); _dbus_verbose ("security policy disallowing message due to sender policy\n"); return FALSE; } if (recipient_policy && !bus_client_policy_check_can_receive (recipient_policy, context->registry, requested_reply, sender, addressed_recipient, proposed_recipient, message)) { const char *dest; dest = dbus_message_get_destination (message); dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED, "A security policy in place prevents this recipient " "from receiving this message from this sender, " "see message bus configuration file (rejected message " "had interface \"%s\" member \"%s\" error name \"%s\" destination \"%s\" reply serial %u requested_reply=%d)", dbus_message_get_interface (message) ? dbus_message_get_interface (message) : "(unset)", dbus_message_get_member (message) ? dbus_message_get_member (message) : "(unset)", dbus_message_get_error_name (message) ? dbus_message_get_error_name (message) : "(unset)", dest ? dest : DBUS_SERVICE_DBUS, dbus_message_get_reply_serial (message), requested_reply); _dbus_verbose ("security policy disallowing message due to recipient policy\n"); return FALSE; } /* See if limits on size have been exceeded */ if (proposed_recipient && dbus_connection_get_outgoing_size (proposed_recipient) > context->limits.max_outgoing_bytes) { const char *dest; dest = dbus_message_get_destination (message); dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED, "The destination service \"%s\" has a full message queue", dest ? dest : (proposed_recipient ? bus_connection_get_name (proposed_recipient) : DBUS_SERVICE_DBUS)); _dbus_verbose ("security policy disallowing message due to full message queue\n"); return FALSE; } if (type == DBUS_MESSAGE_TYPE_METHOD_CALL) { /* Record that we will allow a reply here in the future (don't * bother if the recipient is the bus). Only the addressed recipient * may reply. */ if (sender && addressed_recipient && !bus_connections_expect_reply (bus_connection_get_connections (sender), transaction, sender, addressed_recipient, message, error)) { _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n"); return FALSE; } } _dbus_verbose ("security policy allowing message\n"); return TRUE; }