Github user mxm commented on a diff in the pull request: https://github.com/apache/flink/pull/2275#discussion_r72438936 --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/security/SecurityContext.java --- @@ -0,0 +1,218 @@ +/* + * 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.configuration.ConfigConstants; +import org.apache.flink.configuration.Configuration; +import org.apache.flink.util.Preconditions; +import org.apache.hadoop.security.Credentials; +import org.apache.hadoop.security.UserGroupInformation; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import javax.security.auth.Subject; +import java.io.File; +import java.lang.reflect.Method; +import java.security.PrivilegedExceptionAction; +/* + * Process-wide security context object which initializes UGI with appropriate security credentials and also it + * creates in-memory JAAS configuration object which will serve appropriate ApplicationConfigurationEntry for the + * connector login module implementation that authenticates Kerberos identity using SASL/JAAS based mechanism. + */ +@Internal +public class SecurityContext { + + private static final Logger LOG = LoggerFactory.getLogger(SecurityContext.class); + + private static SecurityContext installedContext; + + public static SecurityContext getInstalled() { return installedContext; } + + private UserGroupInformation ugi; + + SecurityContext(UserGroupInformation ugi) { + this.ugi = ugi; + } + + public <T> T runSecured(final FlinkSecuredRunner<T> runner) throws Exception { + return ugi.doAs(new PrivilegedExceptionAction<T>() { + @Override + public T run() throws Exception { + return runner.run(); + } + }); + } + + public static void install(SecurityConfiguration config) throws Exception { + + // perform static initialization of UGI, JAAS + if(installedContext != null) { + LOG.warn("overriding previous security context"); + } + + // establish the JAAS config + JaasConfiguration jaasConfig = new JaasConfiguration(config.keytab, config.principal); + javax.security.auth.login.Configuration.setConfiguration(jaasConfig); + + //hack since Kafka Login Handler explicitly look for the property or else it throws an exception + //https://github.com/apache/kafka/blob/0.9.0/clients/src/main/java/org/apache/kafka/common/security/kerberos/Login.java#L289 + System.setProperty("java.security.auth.login.config", ""); --- End diff -- Where is this property set before?
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