def normalize_global_config_param(key):
    """Normalize a global config key. Does not check validity of the key.

    :param str key: User-supplied global config key
    :return: The normalized key formatted as an attribute of :class:`.LDAP`
    :rtype: str
    """
    key = key.upper()
    if not key.startswith('DEFAULT_'):
        key = 'DEFAULT_' + key
    return key
