def _init_backends(self):
        """ Initialize auth backends.
        """

        # fetch auth backends from config file
        self._backends = {}
        for section in self._config.sections():

            # does the section define an auth backend?
            section_components = section.rsplit('.', 1)
            if section_components[0] == 'auth.backends':
                auth_backend = section_components[1]
                self._backends[auth_backend] = eval(self._config.get(section, 'type'))

        self._logger.debug("Registered auth backends %s" % str(self._backends))
Initialize auth backends.