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https://issues.apache.org/jira/browse/KAFKA-7630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16687615#comment-16687615
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Andras Beni commented on KAFKA-7630:
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[~asasvari], [~viktorsomogyi] you might want to take a look at this.
> Clarify that broker doesn't need scram username/password for delegation tokens
> ------------------------------------------------------------------------------
>
> Key: KAFKA-7630
> URL: https://issues.apache.org/jira/browse/KAFKA-7630
> Project: Kafka
> Issue Type: Improvement
> Components: documentation, security
> Affects Versions: 2.0.0
> Reporter: Andras Beni
> Priority: Minor
>
> [Documentation|https://kafka.apache.org/documentation/#security_token_authentication]
> on delegation tokens refers to SCRAM
> [configuration|https://kafka.apache.org/documentation/#security_sasl_scram_brokerconfig]
> section. However, in a setup where only delegation tokens use SCRAM and all
> other authentication goes via Kerberos, {{ScramLoginModule}} does not need
> {{username}} and {{password}}.
> This is not obvious from the documentation.
> I believe the same is true for setups where SCRAM is used by clients but
> inter broker communication is GSSAPI or PLAIN, but have not tested it.
>
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