code: def auth(self, username, password):
          
  
          binddn = self._get_user(self._byte_p2(username), NO_ATTR)
          if binddn is not None:
              ldap_client = self._connect()
              try:
                  ldap_client.simple_bind_s(
                          self._byte_p2(binddn),
                          self._byte_p2(password)
                          )
              except ldap.INVALID_CREDENTIALS:
                  ldap_client.unbind_s()
                  return False
              ldap_client.unbind_s()
              return True
          else:
              return False
docs: Authentication of a user