code: def _get_anon_bind(self):
          
          r = self._search(
              'cn=config',
              '(objectClass=*)',
              ['nsslapd-allow-anonymous-access'],
              scope=ldap.SCOPE_BASE
          )
          dn, attrs = r[0]
          state = attrs.get('nsslapd-allow-anonymous-access')[0].decode('utf-8', 'ignore')
          if state in ['on', 'off', 'rootdse']:
              r = state
          else:
              r = None
          self._anon_bind = r
docs: Check anonymous bind
          :return: 'on', 'off', 'rootdse' or None