static dbus_bool_t
create_unique_client_name (BusRegistry *registry,
                           DBusString  *str)
{
  /* We never want to use the same unique client name twice, because
   * we want to guarantee that if you send a message to a given unique
   * name, you always get the same application. So we use two numbers
   * for INT_MAX * INT_MAX combinations, should be pretty safe against
   * wraparound.
   */
  /* FIXME these should be in BusRegistry rather than static vars */
  static int next_major_number = 0;
  static int next_minor_number = 0;
  int len;
  
  len = _dbus_string_get_length (str);
  
  while (TRUE)
    {
      /* start out with 1-0, go to 1-1, 1-2, 1-3,
       * up to 1-MAXINT, then 2-0, 2-1, etc.
       */
      if (next_minor_number <= 0)
        {
          next_major_number += 1;
          next_minor_number = 0;
          if (next_major_number <= 0)
            _dbus_assert_not_reached ("INT_MAX * INT_MAX clients were added");
        }

      _dbus_assert (next_major_number > 0);
      _dbus_assert (next_minor_number >= 0);

      /* appname:MAJOR-MINOR */
      
      if (!_dbus_string_append (str, ":"))
        return FALSE;
      
      if (!_dbus_string_append_int (str, next_major_number))
        return FALSE;

      if (!_dbus_string_append (str, "."))
        return FALSE;
      
      if (!_dbus_string_append_int (str, next_minor_number))
        return FALSE;

      next_minor_number += 1;
      
      /* Check if a client with the name exists */
      if (bus_registry_lookup (registry, str) == NULL)
	break;

      /* drop the number again, try the next one. */
      _dbus_string_set_length (str, len);
    }

  return TRUE;
}
Exemplo n.º 2
0
dbus_bool_t
bus_registry_release_service (BusRegistry      *registry,
                              DBusConnection   *connection,
                              const DBusString *service_name,
                              dbus_uint32_t    *result,
                              BusTransaction   *transaction,
                              DBusError        *error)
{
  dbus_bool_t retval;
  BusService *service;

  retval = FALSE;

  if (!_dbus_validate_bus_name (service_name, 0,
                                _dbus_string_get_length (service_name)))
    {
      dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
                      "Given bus name \"%s\" is not valid",
                      _dbus_string_get_const_data (service_name));

      _dbus_verbose ("Attempt to release invalid service name\n");

      goto out;
    }

  if (_dbus_string_get_byte (service_name, 0) == ':')
    {
      /* Not allowed; the base service name cannot be created or released */
      dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
                      "Cannot release a service starting with ':' such as \"%s\"",
                      _dbus_string_get_const_data (service_name));

      _dbus_verbose ("Attempt to release invalid base service name \"%s\"",
                     _dbus_string_get_const_data (service_name));

      goto out;
    }

   if (_dbus_string_equal_c_str (service_name, DBUS_SERVICE_DBUS))
    {
      /* Not allowed; the base service name cannot be created or released */
      dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
                      "Cannot release the %s service because it is owned by the bus",
                     DBUS_SERVICE_DBUS);

      _dbus_verbose ("Attempt to release service name \"%s\"",
                     DBUS_SERVICE_DBUS);

      goto out;
    }

  service = bus_registry_lookup (registry, service_name);

  if (service == NULL)
    {
      *result = DBUS_RELEASE_NAME_REPLY_NON_EXISTENT;
    }
  else if (!bus_service_has_owner (service, connection))
    {
      *result = DBUS_RELEASE_NAME_REPLY_NOT_OWNER;
    }
  else
    {
      if (!bus_service_remove_owner (service, connection,
                                     transaction, error))
        goto out;

      _dbus_assert (!bus_service_has_owner (service, connection));
      *result = DBUS_RELEASE_NAME_REPLY_RELEASED;
    }

  retval = TRUE;

 out:
  return retval;
}
Exemplo n.º 3
0
dbus_bool_t
bus_registry_acquire_service (BusRegistry      *registry,
                              DBusConnection   *connection,
                              const DBusString *service_name,
                              dbus_uint32_t     flags,
                              dbus_uint32_t    *result,
                              BusTransaction   *transaction,
                              DBusError        *error)
{
  dbus_bool_t retval;
  DBusConnection *old_owner_conn;
  BusClientPolicy *policy;
  BusService *service;
  BusActivation  *activation;
  BusSELinuxID *sid;
  BusOwner *primary_owner;
 
  retval = FALSE;

  if (!_dbus_validate_bus_name (service_name, 0,
                                _dbus_string_get_length (service_name)))
    {
      dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
                      "Requested bus name \"%s\" is not valid",
                      _dbus_string_get_const_data (service_name));
      
      _dbus_verbose ("Attempt to acquire invalid service name\n");
      
      goto out;
    }
  
  if (_dbus_string_get_byte (service_name, 0) == ':')
    {
      /* Not allowed; only base services can start with ':' */
      dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
                      "Cannot acquire a service starting with ':' such as \"%s\"",
                      _dbus_string_get_const_data (service_name));
      
      _dbus_verbose ("Attempt to acquire invalid base service name \"%s\"",
                     _dbus_string_get_const_data (service_name));
      
      goto out;
    }

  if (_dbus_string_equal_c_str (service_name, DBUS_SERVICE_DBUS))
    {
      dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
                      "Connection \"%s\" is not allowed to own the service \"%s\"because "
                      "it is reserved for D-Bus' use only",
                      bus_connection_is_active (connection) ?
                      bus_connection_get_name (connection) :
                      "(inactive)",
                      DBUS_SERVICE_DBUS);
      goto out;
    }

  policy = bus_connection_get_policy (connection);
  _dbus_assert (policy != NULL);

  /* Note that if sid is #NULL then the bus's own context gets used
   * in bus_connection_selinux_allows_acquire_service()
   */
  sid = bus_selinux_id_table_lookup (registry->service_sid_table,
                                     service_name);

  if (!bus_selinux_allows_acquire_service (connection, sid,
					   _dbus_string_get_const_data (service_name), error))
    {

      if (dbus_error_is_set (error) &&
	  dbus_error_has_name (error, DBUS_ERROR_NO_MEMORY))
	{
	  goto out;
	}

      dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
                      "Connection \"%s\" is not allowed to own the service \"%s\" due "
                      "to SELinux policy",
                      bus_connection_is_active (connection) ?
                      bus_connection_get_name (connection) :
                      "(inactive)",
                      _dbus_string_get_const_data (service_name));
      goto out;
    }
  
  if (!bus_client_policy_check_can_own (policy, service_name))
    {
      dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
                      "Connection \"%s\" is not allowed to own the service \"%s\" due "
                      "to security policies in the configuration file",
                      bus_connection_is_active (connection) ?
                      bus_connection_get_name (connection) :
                      "(inactive)",
                      _dbus_string_get_const_data (service_name));
      goto out;
    }

  if (bus_connection_get_n_services_owned (connection) >=
      bus_context_get_max_services_per_connection (registry->context))
    {
      dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
                      "Connection \"%s\" is not allowed to own more services "
                      "(increase limits in configuration file if required)",
                      bus_connection_is_active (connection) ?
                      bus_connection_get_name (connection) :
                      "(inactive)");
      goto out;
    }
  
  service = bus_registry_lookup (registry, service_name);

  if (service != NULL)
    {
      primary_owner = bus_service_get_primary_owner (service);
      if (primary_owner != NULL)
        old_owner_conn = primary_owner->conn;
      else
        old_owner_conn = NULL;
    }
  else
    old_owner_conn = NULL;
      
  if (service == NULL)
    {
      service = bus_registry_ensure (registry,
                                     service_name, connection, flags,
                                     transaction, error);
      if (service == NULL)
        goto out;
    }

  primary_owner = bus_service_get_primary_owner (service);
  if (primary_owner == NULL)
    goto out;

  if (old_owner_conn == NULL)
    {
      _dbus_assert (primary_owner->conn == connection);

      *result = DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER;      
    }
  else if (old_owner_conn == connection)
    {
      bus_owner_set_flags (primary_owner, flags);
      *result = DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER;
    }
  else if (((flags & DBUS_NAME_FLAG_DO_NOT_QUEUE) &&
           !(bus_service_get_allow_replacement (service))) ||
	   ((flags & DBUS_NAME_FLAG_DO_NOT_QUEUE) &&
           !(flags & DBUS_NAME_FLAG_REPLACE_EXISTING))) 
    {
      DBusList *link;
      BusOwner *temp_owner;
    /* Since we can't be queued if we are already in the queue
       remove us */

      link = _bus_service_find_owner_link (service, connection);
      if (link != NULL)
        {
          _dbus_list_unlink (&service->owners, link);
          temp_owner = (BusOwner *)link->data;
          bus_owner_unref (temp_owner); 
          _dbus_list_free_link (link);
        }
      
      *result = DBUS_REQUEST_NAME_REPLY_EXISTS;
    }
  else if (!(flags & DBUS_NAME_FLAG_DO_NOT_QUEUE) &&
           (!(flags & DBUS_NAME_FLAG_REPLACE_EXISTING) ||
	    !(bus_service_get_allow_replacement (service))))
    {
      /* Queue the connection */
      if (!bus_service_add_owner (service, connection, 
                                  flags,
                                  transaction, error))
        goto out;
      
      *result = DBUS_REQUEST_NAME_REPLY_IN_QUEUE;
    }
  else
    {
      /* Replace the current owner */

      /* We enqueue the new owner and remove the first one because
       * that will cause NameAcquired and NameLost messages to
       * be sent.
       */
      
      if (!bus_service_add_owner (service, connection,
                                  flags,
                                  transaction, error))
        goto out;

      if (primary_owner->do_not_queue)
        {
          if (!bus_service_remove_owner (service, old_owner_conn,
                                         transaction, error))
            goto out;
        }
      else
        {
          if (!bus_service_swap_owner (service, old_owner_conn,
                                       transaction, error))
            goto out;
        }
        
    
      _dbus_assert (connection == bus_service_get_primary_owner (service)->conn);
      *result = DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER;
    }

  activation = bus_context_get_activation (registry->context);
  retval = bus_activation_send_pending_auto_activation_messages (activation,
								 service,
								 transaction);
  if (!retval)
    BUS_SET_OOM (error);
  
 out:
  return retval;
}
static dbus_bool_t
bus_driver_handle_list_queued_owners (DBusConnection *connection,
				      BusTransaction *transaction,
				      DBusMessage    *message,
				      DBusError      *error)
{
  const char *text;
  DBusList *base_names;
  DBusList *link;
  DBusString str;
  BusRegistry *registry;
  BusService *service;
  DBusMessage *reply;
  DBusMessageIter iter, array_iter;
  char *dbus_service_name = DBUS_SERVICE_DBUS;
  
  _DBUS_ASSERT_ERROR_IS_CLEAR (error);

  registry = bus_connection_get_registry (connection);

  base_names = NULL;
  text = NULL;
  reply = NULL;

  if (! dbus_message_get_args (message, error,
			       DBUS_TYPE_STRING, &text,
			       DBUS_TYPE_INVALID))
      goto failed;

  _dbus_string_init_const (&str, text);
  service = bus_registry_lookup (registry, &str);
  if (service == NULL &&
      _dbus_string_equal_c_str (&str, DBUS_SERVICE_DBUS))
    {
      /* ORG_FREEDESKTOP_DBUS owns itself */
      if (! _dbus_list_append (&base_names, dbus_service_name))
        goto oom;
    }
  else if (service == NULL)
    {
      dbus_set_error (error, 
                      DBUS_ERROR_NAME_HAS_NO_OWNER,
                      "Could not get owners of name '%s': no such name", text);
      goto failed;
    }
  else
    {
      if (!bus_service_list_queued_owners (service, 
                                           &base_names,
                                           error))
        goto failed;
    }

  _dbus_assert (base_names != NULL);

  reply = dbus_message_new_method_return (message);
  if (reply == NULL)
    goto oom;

  dbus_message_iter_init_append (reply, &iter);
  if (!dbus_message_iter_open_container (&iter,
                                         DBUS_TYPE_ARRAY,
                                         DBUS_TYPE_STRING_AS_STRING,
                                         &array_iter))
    goto oom;
  
  link = _dbus_list_get_first_link (&base_names);
  while (link != NULL)
    {
      char *uname;

      _dbus_assert (link->data != NULL);
      uname = (char *)link->data;
    
      if (!dbus_message_iter_append_basic (&array_iter, 
                                           DBUS_TYPE_STRING,
                                           &uname))
        goto oom;

      link = _dbus_list_get_next_link (&base_names, link);
    }

  if (! dbus_message_iter_close_container (&iter, &array_iter))
    goto oom;
                                    
 
  if (! bus_transaction_send_from_driver (transaction, connection, reply))
    goto oom;

  dbus_message_unref (reply);

  return TRUE;

 oom:
  BUS_SET_OOM (error);

 failed:
  _DBUS_ASSERT_ERROR_IS_SET (error);
  if (reply)
    dbus_message_unref (reply);

  if (base_names)
    _dbus_list_clear (&base_names);

  return FALSE;
}
static dbus_bool_t
bus_driver_handle_get_service_owner (DBusConnection *connection,
				     BusTransaction *transaction,
				     DBusMessage    *message,
				     DBusError      *error)
{
  const char *text;
  const char *base_name;
  DBusString str;
  BusRegistry *registry;
  BusService *service;
  DBusMessage *reply;
  
  _DBUS_ASSERT_ERROR_IS_CLEAR (error);

  registry = bus_connection_get_registry (connection);

  text = NULL;
  reply = NULL;

  if (! dbus_message_get_args (message, error,
			       DBUS_TYPE_STRING, &text,
			       DBUS_TYPE_INVALID))
      goto failed;

  _dbus_string_init_const (&str, text);
  service = bus_registry_lookup (registry, &str);
  if (service == NULL &&
      _dbus_string_equal_c_str (&str, DBUS_SERVICE_DBUS))
    {
      /* ORG_FREEDESKTOP_DBUS owns itself */
      base_name = DBUS_SERVICE_DBUS;
    }
  else if (service == NULL)
    {
      dbus_set_error (error, 
                      DBUS_ERROR_NAME_HAS_NO_OWNER,
                      "Could not get owner of name '%s': no such name", text);
      goto failed;
    }
  else
    {
      base_name = bus_connection_get_name (bus_service_get_primary_owners_connection (service));
      if (base_name == NULL)
        {
          /* FIXME - how is this error possible? */
          dbus_set_error (error,
                          DBUS_ERROR_FAILED,
                          "Could not determine unique name for '%s'", text);
          goto failed;
        }
      _dbus_assert (*base_name == ':');      
    }

  _dbus_assert (base_name != NULL);

  reply = dbus_message_new_method_return (message);
  if (reply == NULL)
    goto oom;

  if (! dbus_message_append_args (reply, 
				  DBUS_TYPE_STRING, &base_name,
				  DBUS_TYPE_INVALID))
    goto oom;
  
  if (! bus_transaction_send_from_driver (transaction, connection, reply))
    goto oom;

  dbus_message_unref (reply);

  return TRUE;

 oom:
  BUS_SET_OOM (error);

 failed:
  _DBUS_ASSERT_ERROR_IS_SET (error);
  if (reply)
    dbus_message_unref (reply);
  return FALSE;
}
static dbus_bool_t
bus_driver_handle_service_exists (DBusConnection *connection,
                                  BusTransaction *transaction,
                                  DBusMessage    *message,
                                  DBusError      *error)
{
  DBusMessage *reply;
  DBusString service_name;
  BusService *service;
  dbus_bool_t service_exists;
  const char *name;
  dbus_bool_t retval;
  BusRegistry *registry;

  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
  
  registry = bus_connection_get_registry (connection);
  
  if (!dbus_message_get_args (message, error,
                              DBUS_TYPE_STRING, &name,
                              DBUS_TYPE_INVALID))
    return FALSE;

  retval = FALSE;

  if (strcmp (name, DBUS_SERVICE_DBUS) == 0)
    {
      service_exists = TRUE;
    }
  else
    {
      _dbus_string_init_const (&service_name, name);
      service = bus_registry_lookup (registry, &service_name);
      service_exists = service != NULL;
    }
  
  reply = dbus_message_new_method_return (message);
  if (reply == NULL)
    {
      BUS_SET_OOM (error);
      goto out;
    }

  if (!dbus_message_append_args (reply,
                                 DBUS_TYPE_BOOLEAN, &service_exists,
                                 0))
    {
      BUS_SET_OOM (error);
      goto out;
    }

  if (!bus_transaction_send_from_driver (transaction, connection, reply))
    {
      BUS_SET_OOM (error);
      goto out;
    }

  retval = TRUE;
  
 out:
  if (reply)
    dbus_message_unref (reply);

  return retval;
}
static dbus_bool_t
bus_driver_handle_get_connection_selinux_security_context (DBusConnection *connection,
							   BusTransaction *transaction,
							   DBusMessage    *message,
							   DBusError      *error)
{
  const char *service;
  DBusString str;
  BusRegistry *registry;
  BusService *serv;
  DBusConnection *conn;
  DBusMessage *reply;
  BusSELinuxID *context;

  _DBUS_ASSERT_ERROR_IS_CLEAR (error);

  registry = bus_connection_get_registry (connection);

  service = NULL;
  reply = NULL;

  if (! dbus_message_get_args (message, error,
			       DBUS_TYPE_STRING, &service,
			       DBUS_TYPE_INVALID))
      goto failed;

  _dbus_verbose ("asked for security context of connection %s\n", service);

  _dbus_string_init_const (&str, service);
  serv = bus_registry_lookup (registry, &str);
  if (serv == NULL)
    {
      dbus_set_error (error, 
		      DBUS_ERROR_NAME_HAS_NO_OWNER,
		      "Could not get security context of name '%s': no such name", service);
      goto failed;
    }

  conn = bus_service_get_primary_owners_connection (serv);

  reply = dbus_message_new_method_return (message);
  if (reply == NULL)
    goto oom;

  context = bus_connection_get_selinux_id (conn);
  if (!context)
    {
      dbus_set_error (error,
                      DBUS_ERROR_SELINUX_SECURITY_CONTEXT_UNKNOWN,
                      "Could not determine security context for '%s'", service);
      goto failed;
    }

  if (! bus_selinux_append_context (reply, context, error))
    goto failed;

  if (! bus_transaction_send_from_driver (transaction, connection, reply))
    goto oom;

  dbus_message_unref (reply);

  return TRUE;

 oom:
  BUS_SET_OOM (error);

 failed:
  _DBUS_ASSERT_ERROR_IS_SET (error);
  if (reply)
    dbus_message_unref (reply);
  return FALSE;
}
static dbus_bool_t
bus_driver_handle_get_connection_unix_process_id (DBusConnection *connection,
						  BusTransaction *transaction,
						  DBusMessage    *message,
						  DBusError      *error)
{
  const char *service;
  DBusString str;
  BusRegistry *registry;
  BusService *serv;
  DBusConnection *conn;
  DBusMessage *reply;
  unsigned long pid;
  dbus_uint32_t pid32;

  _DBUS_ASSERT_ERROR_IS_CLEAR (error);

  registry = bus_connection_get_registry (connection);

  service = NULL;
  reply = NULL;

  if (! dbus_message_get_args (message, error,
			       DBUS_TYPE_STRING, &service,
			       DBUS_TYPE_INVALID))
      goto failed;

  _dbus_verbose ("asked for PID of connection %s\n", service);

  _dbus_string_init_const (&str, service);
  serv = bus_registry_lookup (registry, &str);
  if (serv == NULL)
    {
      dbus_set_error (error, 
		      DBUS_ERROR_NAME_HAS_NO_OWNER,
		      "Could not get PID of name '%s': no such name", service);
      goto failed;
    }

  conn = bus_service_get_primary_owners_connection (serv);

  reply = dbus_message_new_method_return (message);
  if (reply == NULL)
    goto oom;

  if (!dbus_connection_get_unix_process_id (conn, &pid))
    {
      dbus_set_error (error,
                      DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN,
                      "Could not determine PID for '%s'", service);
      goto failed;
    }

  pid32 = pid;
  if (! dbus_message_append_args (reply,
                                  DBUS_TYPE_UINT32, &pid32,
                                  DBUS_TYPE_INVALID))
    goto oom;

  if (! bus_transaction_send_from_driver (transaction, connection, reply))
    goto oom;

  dbus_message_unref (reply);

  return TRUE;

 oom:
  BUS_SET_OOM (error);

 failed:
  _DBUS_ASSERT_ERROR_IS_SET (error);
  if (reply)
    dbus_message_unref (reply);
  return FALSE;
}