io.druid.storage.hdfs.HdfsStorageAuthentication.java Source code

Introduction

Here is the source code for io.druid.storage.hdfs.HdfsStorageAuthentication.java

Source

/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.storage.hdfs;

import com.google.common.base.Strings;
import com.google.inject.Inject;

import io.druid.guice.ManageLifecycle;
import io.druid.java.util.common.ISE;
import io.druid.java.util.common.lifecycle.LifecycleStart;
import io.druid.java.util.common.lifecycle.LifecycleStop;
import io.druid.java.util.common.logger.Logger;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.security.UserGroupInformation;

import java.io.IOException;

@ManageLifecycle
public class HdfsStorageAuthentication {
    private static final Logger log = new Logger(HdfsStorageAuthentication.class);
    private final HdfsKerberosConfig hdfsKerberosConfig;
    private final Configuration hadoopConf;

    @Inject
    public HdfsStorageAuthentication(HdfsKerberosConfig hdfsKerberosConfig, Configuration hadoopConf) {
        this.hdfsKerberosConfig = hdfsKerberosConfig;
        this.hadoopConf = hadoopConf;
    }

    /**
     * Dose authenticate against a secured hadoop cluster
     * In case of any bug fix make sure to fix the code in JobHelper#authenticate as well.
     */
    @LifecycleStart
    public void authenticate() {
        String principal = hdfsKerberosConfig.getPrincipal();
        String keytab = hdfsKerberosConfig.getKeytab();
        if (!Strings.isNullOrEmpty(principal) && !Strings.isNullOrEmpty(keytab)) {
            UserGroupInformation.setConfiguration(hadoopConf);
            if (UserGroupInformation.isSecurityEnabled()) {
                try {
                    if (UserGroupInformation.getCurrentUser().hasKerberosCredentials() == false
                            || !UserGroupInformation.getCurrentUser().getUserName().equals(principal)) {
                        log.info("Trying to authenticate user [%s] with keytab [%s]..", principal, keytab);
                        UserGroupInformation.loginUserFromKeytab(principal, keytab);
                    }
                } catch (IOException e) {
                    throw new ISE(e, "Failed to authenticate user principal [%s] with keytab [%s]", principal,
                            keytab);
                }
            }
        }
    }

    @LifecycleStop
    public void stop() {
        //noop
    }
}