Edoardo Comar commented on KAFKA-4185:

Hi [~piyushvijay] I see that a KIP has been proposed as a wider solution (works 
for other mechanisms too)

> Abstract out password verifier in SaslServer as an injectable dependency
> ------------------------------------------------------------------------
>                 Key: KAFKA-4185
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4185
>             Project: Kafka
>          Issue Type: Improvement
>          Components: security
>    Affects Versions:
>            Reporter: Piyush Vijay
>             Fix For:
> Kafka comes with a default SASL/PLAIN implementation which assumes that 
> username and password are present in a JAAS
> config file. People often want to use some other way to provide username and 
> password to SaslServer. Their best bet,
> currently, is to have their own implementation of SaslServer (which would be, 
> in most cases, a copied version of PlainSaslServer
> minus the logic where password verification happens). This is not ideal.
> We believe that there exists a better way to structure the current 
> PlainSaslServer implementation which makes it very
> easy for people to plug-in their custom password verifier without having to 
> rewrite SaslServer or copy any code.
> The idea is to have an injectable dependency interface PasswordVerifier which 
> can be re-implemented based on the
> requirements. There would be no need to re-implement or extend 
> PlainSaslServer class.
> Note that this is commonly asked feature and there have been some attempts in 
> the past to solve this problem:
> https://github.com/apache/kafka/pull/1350
> https://github.com/apache/kafka/pull/1770
> https://issues.apache.org/jira/browse/KAFKA-2629
> https://issues.apache.org/jira/browse/KAFKA-3679
> We believe that this proposed solution does not have the demerits because of 
> previous proposals were rejected.
> I would be happy to discuss more.
> Please find the link to the PR in the comments.

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