Github user mxm commented on a diff in the pull request: https://github.com/apache/flink/pull/2275#discussion_r73158919 --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/security/JaasConfiguration.java --- @@ -0,0 +1,158 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.flink.runtime.security; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.util.Preconditions; +import org.apache.hadoop.security.authentication.util.KerberosUtil; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import javax.security.auth.login.AppConfigurationEntry; +import javax.security.auth.login.Configuration; +import java.io.File; +import java.util.HashMap; +import java.util.Map; + +/** + * + * JAAS configuration provider object that provides default LoginModule for various connectors that supports + * JAAS/SASL based Kerberos authentication. The implementation is inspired from Hadoop UGI class. + * + * Different connectors uses different login module name to implement JAAS based authentication support. + * For example, Kafka expects the login module name to be "kafkaClient" whereas ZooKeeper expect the + * name to be "client". This sets onus on the Flink cluster administrator to configure/provide right + * JAAS config entries. To simplify this requirement, we have introduced this abstraction that provides + * a standard lookup to get the login module entry for the JAAS based authentication to work. + * + * HDFS connector will not be impacted with this configuration since it uses UGI based mechanism to authenticate. + * + * <a href="https://docs.oracle.com/javase/7/docs/api/javax/security/auth/login/Configuration.html">Configuration</a> + * + */ + +@Internal +public class JaasConfiguration extends Configuration { + + private static final Logger LOG = LoggerFactory.getLogger(JaasConfiguration.class); + + public static final String JAVA_VENDOR_NAME = System.getProperty("java.vendor"); + + public static final boolean IBM_JAVA; + + static { + IBM_JAVA = JAVA_VENDOR_NAME.contains("IBM"); + } + + public JaasConfiguration(String keytab, String principal) { --- End diff -- Then making it protected should work.
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