Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/22598#discussion_r233637694
--- 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 --
If I understand this correctly, this code is trying to log in again, right?
Two questions:
- why is that necessary?
- won't this fail if the user only has a TGT (i.e. login via kinit)?
I was expecting that you could reuse the already available login
information to talk to the Kafka broker here and get delegation tokens. For
example, you can do this to change the JVM's security context to the current
user, if it's not already set:
```
org.apache.hadoop.security.UserGroupInformation.getCurrentUser().doAs(
new java.security.PrivilegedExceptionAction[Unit] {
override def run(): Unit = {
println(javax.security.auth.Subject.getSubject(
java.security.AccessController.getContext()))
}
}
)
// Exiting paste mode, now interpreting.
Subject:
Principal: UnixPrincipal: blah
Principal: UnixNumericUserPrincipal: 2000
Principal: UnixNumericGroupPrincipal [Primary Group]: 2000
```
Wouldn't that be enough here? That `Subject` has a TGT, so that should be
enough to talk to Kafka. Having to do yet another login just for Kafka feels a
bit weird.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
