Github user gaborgsomogyi commented on a diff in the pull request:
https://github.com/apache/spark/pull/22598#discussion_r233898001
--- Diff:
core/src/main/scala/org/apache/spark/deploy/security/KafkaTokenUtil.scala ---
@@ -0,0 +1,146 @@
+/*
+ * 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.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 {
+ private[spark] val TOKEN_KIND = new Text("KAFKA_DELEGATION_TOKEN")
+ private[spark] 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)
+ if (protocol.endsWith("SSL")) {
+ logInfo("SSL protocol detected.")
+ sparkConf.get(KAFKA_TRUSTSTORE_LOCATION).foreach {
truststoreLocation =>
+ adminClientProperties.put("ssl.truststore.location",
truststoreLocation)
+ }
+ sparkConf.get(KAFKA_TRUSTSTORE_PASSWORD).foreach {
truststorePassword =>
+ adminClientProperties.put("ssl.truststore.password",
truststorePassword)
+ }
+ } else {
+ logWarning("Obtaining kafka delegation token through plain
communication channel. Please " +
+ "consider the security impact.")
+ }
+
+ // There are multiple possibilities to log in:
--- End diff --
This code doesn't try to log in but provides dynamic jaas configuration to
kafka. In the original implementation only jaas was possible now I've extended
it to make things easier for the user.
> why is that necessary?
This eliminates the need to provide file based jaas configuration.
Old way: https://github.com/gaborgsomogyi/spark-structured-secure-kafka-app
New way:
https://github.com/gaborgsomogyi/spark-structured-secure-dt-kafka-app
> won't this fail if the user only has a TGT (i.e. login via kinit)?
It works. TGT can be provided to kafka by providing a file based jaas file
with content like:
```
useTicketCache=true
ticketCache=<path>
```
Please see how kafka client authentication works:
https://cwiki.apache.org/confluence/display/KAFKA/KIP-85%3A+Dynamic+JAAS+configuration+for+Kafka+clients
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