lianetm commented on code in PR #18989:
URL: https://github.com/apache/kafka/pull/18989#discussion_r1969791054


##########
core/src/main/scala/kafka/server/KafkaApis.scala:
##########
@@ -2592,6 +2606,32 @@ class KafkaApis(val requestChannel: RequestChannel,
             response.groups.addAll(results)
           }
 
+          // Clients are not allowed to see topics that are not authorized for 
Describe.
+          val topicsToCheck = new mutable.HashSet[String]
+          response.groups.forEach(_.members.forEach { member =>
+            List(member.assignment, member.targetAssignment).foreach { 
assignment =>
+              assignment.topicPartitions.asScala.foreach { tp =>
+                topicsToCheck += tp.topicName
+              }
+            }
+          })
+          val authorizedTopics = 
authHelper.filterByAuthorized(request.context, DESCRIBE, TOPIC,
+            topicsToCheck)(identity)
+          val updatedGroups = response.groups.asScala.map { group =>
+            if (group.members.asScala.exists(member =>
+              List(member.assignment, 
member.targetAssignment).exists(assignment =>
+                assignment.topicPartitions.asScala.exists(tp => 
!authorizedTopics.contains(tp.topicName))))) {
+              new ConsumerGroupDescribeResponseData.DescribedGroup()
+                .setGroupId(group.groupId)
+                .setErrorCode(Errors.TOPIC_AUTHORIZATION_FAILED.code)
+                .setErrorMessage("The group has described topic(s) that the 
client is not authorized to describe.")

Review Comment:
   this one I find it valuable, not the same case as my other comment. In this 
case we don't have topics in the request, so getting a topic_auth in response 
may not be clear enough, and this generic msg may be helpful. 



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