in flume-shared/flume-shared-kafka/src/main/java/org/apache/flume/shared/kafka/KafkaSSLUtil.java [66:73]
public static boolean isSSLEnabled(Properties kafkaProps) {
String securityProtocol =
kafkaProps.getProperty(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG);
return securityProtocol != null &&
(securityProtocol.equals(SecurityProtocol.SSL.name) ||
securityProtocol.equals(SecurityProtocol.SASL_SSL.name));
}