Github user steveloughran commented on a diff in the pull request:
https://github.com/apache/spark/pull/22598#discussion_r237206264
--- Diff:
core/src/main/scala/org/apache/spark/deploy/security/KafkaTokenUtil.scala ---
@@ -0,0 +1,168 @@
+/*
+ * 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.text.SimpleDateFormat
+import java.util.Properties
+
+import org.apache.hadoop.io.Text
+import org.apache.hadoop.security.token.{Token, TokenIdentifier}
+import
org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier
+import org.apache.kafka.clients.CommonClientConfigs
+import org.apache.kafka.clients.admin.{AdminClient,
CreateDelegationTokenOptions}
+import org.apache.kafka.common.config.SaslConfigs
+import
org.apache.kafka.common.security.auth.SecurityProtocol.{SASL_PLAINTEXT,
SASL_SSL, SSL}
+import org.apache.kafka.common.security.token.delegation.DelegationToken
+
+import org.apache.spark.SparkConf
+import org.apache.spark.internal.Logging
+import org.apache.spark.internal.config._
+
+private[spark] object KafkaTokenUtil extends Logging {
+ val TOKEN_KIND = new Text("KAFKA_DELEGATION_TOKEN")
+ val TOKEN_SERVICE = new Text("kafka.server.delegation.token")
+
+ private[spark] class KafkaDelegationTokenIdentifier extends
AbstractDelegationTokenIdentifier {
+ override def getKind: Text = TOKEN_KIND
+ }
+
+ private[security] def obtainToken(sparkConf: SparkConf): (Token[_ <:
TokenIdentifier], Long) = {
+ val adminClient =
AdminClient.create(createAdminClientProperties(sparkConf))
+ val createDelegationTokenOptions = new CreateDelegationTokenOptions()
+ val createResult =
adminClient.createDelegationToken(createDelegationTokenOptions)
+ val token = createResult.delegationToken().get()
+ printToken(token)
+
+ (new Token[KafkaDelegationTokenIdentifier](
+ token.tokenInfo.tokenId.getBytes,
+ token.hmacAsBase64String.getBytes,
+ TOKEN_KIND,
+ TOKEN_SERVICE
+ ), token.tokenInfo.expiryTimestamp)
+ }
+
+ private[security] def createAdminClientProperties(sparkConf: SparkConf):
Properties = {
+ val adminClientProperties = new Properties
+
+ val bootstrapServers = sparkConf.get(KAFKA_BOOTSTRAP_SERVERS)
+ require(bootstrapServers.nonEmpty, s"Tried to obtain kafka delegation
token but bootstrap " +
+ "servers not configured.")
+
adminClientProperties.put(CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG,
bootstrapServers.get)
+
+ val protocol = sparkConf.get(KAFKA_SECURITY_PROTOCOL)
+
adminClientProperties.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG,
protocol)
+ protocol match {
+ case SASL_SSL.name =>
+ setTrustStoreProperties(sparkConf, adminClientProperties)
+
+ case SSL.name =>
+ setTrustStoreProperties(sparkConf, adminClientProperties)
+ setKeyStoreProperties(sparkConf, adminClientProperties)
+ logWarning("Obtaining kafka delegation token with SSL protocol.
Please " +
+ "configure 2-way authentication on the broker side.")
+
+ case SASL_PLAINTEXT.name =>
+ logWarning("Obtaining kafka delegation token through plain
communication channel. Please " +
+ "consider the security impact.")
+ }
+
+ // There are multiple possibilities to log in:
--- End diff --
+ non-normative list of [what I think are the relevant JVM
Settings](https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/KDiag.java#L88)
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