def get_additional_names(options):
    """
    Return a list of strings to be added to a SAN certificates.

    :param options:
    :return:
    """
    names = []
    # add SANs if present
    if options.get("extensions"):
        for san in options["extensions"]["sub_alt_names"]:
            if isinstance(san, x509.DNSName):
                names.append(san.value)
    return names

    Return a list of strings to be added to a SAN certificates.

    :param options:
    :return:
    
lemur/plugins/lemur_verisign/plugin.py