Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/17723#discussion_r114035613 --- Diff: core/src/main/scala/org/apache/spark/deploy/security/ConfigurableCredentialManager.scala --- @@ -0,0 +1,133 @@ +/* + * 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.spark.deploy.security + +import java.util.ServiceLoader + +import scala.collection.JavaConverters._ + +import org.apache.hadoop.conf.Configuration +import org.apache.hadoop.security.{Credentials, UserGroupInformation} + +import org.apache.spark.SparkConf +import org.apache.spark.deploy.SparkHadoopUtil +import org.apache.spark.internal.Logging +import org.apache.spark.util.Utils + +/** + * A ConfigurableCredentialManager to manage all the registered credential providers and offer + * APIs for other modules to obtain credentials as well as renewal time. By default + * [[HadoopFSCredentialProvider]], [[HiveCredentialProvider]] and [[HBaseCredentialProvider]] will + * be loaded in if not explicitly disabled, any plugged-in credential provider wants to be + * managed by ConfigurableCredentialManager needs to implement [[ServiceCredentialProvider]] + * interface and put into resources/META-INF/services to be loaded by ServiceLoader. + * + * Also each credential provider is controlled by + * spark.security.credentials.{service}.enabled, it will not be loaded in if set to false. + * For example, Hive's credential provider [[HiveCredentialProvider]] can be enabled/disabled by + * the configuration spark.security.credentials.hive.enabled. + */ +private[spark] class ConfigurableCredentialManager( + sparkConf: SparkConf, + hadoopConf: Configuration, + hadoopAccessManager: HadoopAccessManager) + extends Logging { + + private val deprecatedProviderEnabledConfigs = List( + "spark.yarn.security.tokens.%s.enabled", + "spark.yarn.security.credentials.%s.enabled") + private val providerEnabledConfig = "spark.security.credentials.%s.enabled" + + // Maintain all the registered credential providers + private val credentialProviders = getCredentialProviders + logDebug(s"Using the following credential providers: ${credentialProviders.keys.mkString(", ")}.") + + def this(sparkConf: SparkConf, hadoopConf: Configuration) { + this(sparkConf, hadoopConf, new DefaultHadoopAccessManager(hadoopConf)) + } + + def this(sparkConf: SparkConf) { + this(sparkConf, SparkHadoopUtil.get.newConfiguration(sparkConf)) + } + + private def getCredentialProviders(): Map[String, ServiceCredentialProvider] = { + val providers = loadCredentialProviders + + // Filter out credentials in which spark.security.credentials.{service}.enabled is false. + providers + .filter(p => isServiceEnabled(p.serviceName)) + .map(p => (p.serviceName, p)) + .toMap + } + + protected def isServiceEnabled(serviceName: String): Boolean = { + val key = providerEnabledConfig.format(serviceName) + + deprecatedProviderEnabledConfigs.foreach { pattern => + val deprecatedKey = pattern.format(serviceName) + if (sparkConf.contains(deprecatedKey)) { + logWarning(s"${deprecatedKey} is deprecated, using ${key} instead") + } + } + + val isEnabledDeprecated = deprecatedProviderEnabledConfigs.forall { pattern => + sparkConf + .getOption(pattern.format(serviceName)) + .map(_.toBoolean) + .getOrElse(true) + } + + sparkConf + .getOption(key) + .map(_.toBoolean) + .getOrElse(isEnabledDeprecated) + } + + private def loadCredentialProviders: List[ServiceCredentialProvider] = { + ServiceLoader.load(classOf[ServiceCredentialProvider], Utils.getContextOrSparkClassLoader) + .asScala.toList + } + + /** + * Get credential provider for the specified service. + */ + def getServiceCredentialProvider(service: String): Option[ServiceCredentialProvider] = { + credentialProviders.get(service) + } + + /** + * Writes delegation tokens to creds. Delegation tokens are fetched from all registered + * providers. + * + * @return nearest time of next renewal, Long.MaxValue if all the credentials aren't renewable, --- End diff -- Sentence is a little redundant.
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