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https://issues.apache.org/jira/browse/SOLR-10814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16101521#comment-16101521
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Don Bosco Durai commented on SOLR-10814:
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bq. No. getShortName() is not backward compatible. How are you going to switch 
between the both?
What I meant was, all existing code will continue using getPrincipal(). And for 
anyone writing new authorization plugin, they can use either of the two 
methods. Those who want to keep to play it safe, can use getShortName()  and 
not worry about the underlying authentication mode. And those who want to do 
additional processing then can use getPrincipal(). 






> Solr RuleBasedAuthorization config doesn't work seamlessly with kerberos 
> authentication
> ---------------------------------------------------------------------------------------
>
>                 Key: SOLR-10814
>                 URL: https://issues.apache.org/jira/browse/SOLR-10814
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>    Affects Versions: 6.2
>            Reporter: Hrishikesh Gadre
>
> Solr allows configuring roles to control user access to the system. This is 
> accomplished through rule-based permission definitions which are assigned to 
> users.
> The authorization framework in Solr passes the information about the request 
> (to be authorized) using an instance of AuthorizationContext class. Currently 
> the only way to extract authenticated user is via getUserPrincipal() method 
> which returns an instance of java.security.Principal class. The 
> RuleBasedAuthorizationPlugin implementation invokes getName() method on the 
> Principal instance to fetch the list of associated roles.
> https://github.com/apache/lucene-solr/blob/2271e73e763b17f971731f6f69d6ffe46c40b944/solr/core/src/java/org/apache/solr/security/RuleBasedAuthorizationPlugin.java#L156
> In case of basic authentication mechanism, the principal is the userName. 
> Hence it works fine. But in case of kerberos authentication, the user 
> principal also contains the RELM information e.g. instead of foo, it would 
> return f...@example.com. This means if the user changes the authentication 
> mechanism, he would also need to change the user-role mapping in 
> authorization section to use f...@example.com instead of foo. This is not 
> good from usability perspective.   



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