def _is_ssl_on_directive(entry):
    """Checks if an nginx parsed entry is an 'ssl on' directive.

    :param list entry: the parsed entry
    :returns: Whether it's an 'ssl on' directive
    :rtype: bool

    """
    return (isinstance(entry, list) and
            len(entry) == 2 and entry[0] == 'ssl' and
            entry[1] == 'on')