[jira] [Created] (KAFKA-7631) NullPointerException when SCRAM is allowed bu ScramLoginModule is not in broker's jaas.conf

[Andras Beni (JIRA)]

Andras Beni created KAFKA-7631:
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             Summary: NullPointerException when SCRAM is allowed bu 
ScramLoginModule is not in broker's jaas.conf
                 Key: KAFKA-7631
                 URL: https://issues.apache.org/jira/browse/KAFKA-7631
             Project: Kafka
          Issue Type: Improvement
          Components: security
    Affects Versions: 2.0.0
            Reporter: Andras Beni


When user wants to use delegation tokens and lists {{SCRAM}} in 
{{sasl.enabled.mechanisms}}, but does not add {{ScramLoginModule}} to broker's 
JAAS configuration, a null pointer exception is thrown on broker side and the 
connection is closed.

Meaningful error message should be logged and sent back to the client.
{code}
java.lang.NullPointerException
        at 
org.apache.kafka.common.security.authenticator.SaslServerAuthenticator.handleSaslToken(SaslServerAuthenticator.java:376)
        at 
org.apache.kafka.common.security.authenticator.SaslServerAuthenticator.authenticate(SaslServerAuthenticator.java:262)
        at 
org.apache.kafka.common.network.KafkaChannel.prepare(KafkaChannel.java:127)
        at 
org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:489)
        at org.apache.kafka.common.network.Selector.poll(Selector.java:427)
        at kafka.network.Processor.poll(SocketServer.scala:679)
        at kafka.network.Processor.run(SocketServer.scala:584)
        at java.lang.Thread.run(Thread.java:748)
{code}



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