[jira] [Created] (KAFKA-15053) Regression for security.protocol validation starting from 3.3.0

["Bo Gao (Jira)" <ji...@apache.org>]

Bo Gao created KAFKA-15053:
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             Summary: Regression for security.protocol validation starting from 3.3.0
                 Key: KAFKA-15053
                 URL: https://issues.apache.org/jira/browse/KAFKA-15053
             Project: Kafka
          Issue Type: Bug
          Components: clients
    Affects Versions: 3.3.0
            Reporter: Bo Gao


This Jira issue introduced validations on multiple configs. As a consequence, config {{security.protocol}} now only allows upper case values such as PLAINTEXT, SSL, SASL_PLAINTEXT, SASL_SSL. Before this change, lower case values like sasl_ssl, ssl are also supported, there's even a case insensitive logic inside [SecurityProtocol|https://github.com/apache/kafka/blob/146a6976aed0d9f90c70b6f21dca8b887cc34e71/clients/src/main/java/org/apache/kafka/common/security/auth/SecurityProtocol.java#L70-L73] to handle the lower case values.

I think we should treat this as a regression bug since we don't support lower case values anymore since 3.3.0. For versions later than 3.3.0, we are getting error like this when using lower case value sasl_ssl

{{Invalid value sasl_ssl for configuration security.protocol: String must be one of: PLAINTEXT, SSL, SASL_PLAINTEXT, SASL_SSL}}



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