ASF GitHub Bot commented on KAFKA-6912:

rajinisivaram opened a new pull request #5030: KAFKA-6912: Add test for 
authorization with custom principal types
URL: https://github.com/apache/kafka/pull/5030
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)

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> Add authorization tests for custom principal types
> --------------------------------------------------
>                 Key: KAFKA-6912
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6912
>             Project: Kafka
>          Issue Type: Task
>          Components: core
>            Reporter: Rajini Sivaram
>            Assignee: Rajini Sivaram
>            Priority: Major
>             Fix For: 2.0.0
> KIP-290 proposes to add prefixed-wildcarded principals to enable ACLs to be 
> configured for groups of principals. This doesn't work with all security 
> protocols - e.g. SSL principals are of format CN=name,O=org,C=country where 
> prefixes don't fit in terms of grouping. Kafka currently doesn't support the 
> concept of user groups, but it is possible to use custom 
> KafkaPrincipalBuilders to generate group principals during authentication. By 
> default, Kafka generates principals of type User, but custom types (e.g. 
> Group) are supported. This does currently have the restriction ACLs may be 
> defined only at group level (cannot combine both user & group level ACLs for 
> a connection), but it works currently for all security protocols.
> We don't have any tests that verify custom principal types and authorization 
> based on custom principal types. It will be good to add some tests.

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