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https://issues.apache.org/jira/browse/HADOOP-14146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16057750#comment-16057750
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Daryn Sharp commented on HADOOP-14146:
--------------------------------------

I don't think there's much worry of a completely incompatible change occurring. 
:)  ASN.1 was defined in 1984.  The Kerberos v5 DER was defined in 1993.

Thanks!

> KerberosAuthenticationHandler should authenticate with SPN in AP-REQ
> --------------------------------------------------------------------
>
>                 Key: HADOOP-14146
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14146
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.5.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HADOOP-14146.1.patch, HADOOP-14146.2.patch, 
> HADOOP-14146.3.patch, HADOOP-14146.patch
>
>
> Many attempts (HADOOP-10158, HADOOP-11628, HADOOP-13565) have tried to add 
> multiple SPN host and/or realm support to spnego authentication.  The basic 
> problem is the server tries to guess and/or brute force what SPN the client 
> used.  The server should just decode the SPN from the AP-REQ.



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