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https://issues.apache.org/jira/browse/HADOOP-15518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16505025#comment-16505025
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Kevin Minder commented on HADOOP-15518:
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[~eyang] < Can you please clarify if your comment about a race condition is a
criticism of the patch? I'm having trouble rationalizing your +1 with your
other comments. Are you really trying to say that the patch solves the race
condition?
> Authentication filter calling handler after request already authenticated
> -------------------------------------------------------------------------
>
> Key: HADOOP-15518
> URL: https://issues.apache.org/jira/browse/HADOOP-15518
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Affects Versions: 2.7.1
> Reporter: Kevin Minder
> Assignee: Kevin Minder
> Priority: Major
> Attachments: HADOOP-15518-001.patch
>
>
> The hadoop-auth AuthenticationFilter will invoke its handler even if a prior
> successful authentication has occurred in the current request. This
> primarily affects situations where multiple authentication mechanism has been
> configured. For example when core-site.xml's has
> hadoop.http.authentication.type=kerberos and yarn-site.xml has
> yarn.timeline-service.http-authentication.type=kerberos the result is an
> attempt to perform two Kerberos authentications for the same request. This
> in turn results in Kerberos triggering a replay attack detection. The
> javadocs for AuthenticationHandler
> ([https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/server/AuthenticationHandler.java)]
> indicate for the authenticate method that
> {quote}This method is invoked by the AuthenticationFilter only if the HTTP
> client request is not yet authenticated.
> {quote}
> This does not appear to be the case in practice.
> I've create a patch and tested on a limited number of functional use cases
> (e.g. the timeline-service issue noted above). If there is general agreement
> that the change is valid I'll add unit tests to the patch.
>
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