Wayland Goodliffe created KAFKA-12732:
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Summary: Possible Kerberos configuration bug in mirrormaker
Key: KAFKA-12732
URL: https://issues.apache.org/jira/browse/KAFKA-12732
Project: Kafka
Issue Type: Bug
Components: mirrormaker
Affects Versions: 2.8.0, 1.0.0
Reporter: Wayland Goodliffe
I'm fairly sure that I've found an obscure configuration bug with mirrormaker
when using kerberos. Luckily there is an easy workaround.
I have tested the old mirrormaker in kafka v1.0.0, as well as mirrormaker 2 in
v2.8.0 (both legacy mode and otherwise) - so I think there's a good chance this
affects all versions.
The set up is as follows:
* consumer and producer both use
** security.protocol=SASL_SSL
** sasl.mechanism=GSSAPI
* consumer and producer are in the same realm, but have different
sasl.kerberos.service.name
** e.g. kafka-source and kafka-target
* you specify the service names via sasl.kerberos.service.name (rather than
serviceName in the jaas.conf)
** either in mm2.properties source.sasl.kerberos.service.name and
target.sasl.kerberos.service.name
** or for legacy mode in consumer.config and producer.config
Then
* mirrormaker uses the wrong service name in the second adminclient connection
when trying to validate the response ticket.
** note that it reports the correct values when it logs the client config, so
this is likely due to some hidden issue deeper in kerberos code.
* For example, in my case with 2.8.0, it would try to validate
kafka-source/target.host@REALM instead of validating
kafka-target/target.host@REALM
* The resultant exception was
KrbException: Server not found in Kerberos database (7) - LOOKING_UP_SERVERdue
to kafka-source not being defined for target.host
Workaround
* ensure you specify separate jaas.conf for consumer/producer via
sasl.jaas.config properties (instead of via -Djava.security.auth.login.config)
* Use the jaas.conf field serviceName to specify the correct values for the
brokers.
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