org.apache.spark.security.ShellBasedGroupsMappingProvider.scala Maven / Gradle / Ivy
/*
* 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,
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package org.apache.spark.security
import org.apache.spark.internal.Logging
import org.apache.spark.util.Utils
/**
* This class is responsible for getting the groups for a particular user in Unix based
* environments. This implementation uses the Unix Shell based id command to fetch the user groups
* for the specified user. It does not cache the user groups as the invocations are expected
* to be infrequent.
*/
private[spark] class ShellBasedGroupsMappingProvider extends GroupMappingServiceProvider
with Logging {
override def getGroups(username: String): Set[String] = {
val userGroups = getUnixGroups(username)
logDebug("User: " + username + " Groups: " + userGroups.mkString(","))
userGroups
}
// shells out a "bash -c id -Gn username" to get user groups
private def getUnixGroups(username: String): Set[String] = {
val cmdSeq = Seq("bash", "-c", "id -Gn " + username)
// we need to get rid of the trailing "\n" from the result of command execution
Utils.executeAndGetOutput(cmdSeq).stripLineEnd.split(" ").toSet
}
}