def cert_option_certificates_from_file(path)
        data = File.read(path)
        pattern = Regexp.compile('-+BEGIN CERTIFICATE-+\r?\n(?:[^-]*\r?\n)+-+END CERTIFICATE-+\r?\n?', Regexp::MULTILINE)
        list = []
        data.scan(pattern){|match| list << OpenSSL::X509::Certificate.new(match) }