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https://issues.apache.org/jira/browse/HADOOP-12751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16326950#comment-16326950
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Vinayakumar B commented on HADOOP-12751:
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This looks to be good candidate for branch-2.7.

Do you agree [~shv] ?

Not a direct cherry-pick. Patch needs update for branch-2.7

> While using kerberos Hadoop incorrectly assumes names with '@' to be 
> non-simple
> -------------------------------------------------------------------------------
>
>                 Key: HADOOP-12751
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12751
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.7.2
>         Environment: kerberos
>            Reporter: Bolke de Bruin
>            Assignee: Bolke de Bruin
>            Priority: Critical
>              Labels: kerberos
>             Fix For: 2.8.0, 3.0.0-alpha1
>
>         Attachments: 0001-HADOOP-12751-leave-user-validation-to-os.patch, 
> 0001-Remove-check-for-user-name-characters-and.patch, 
> 0002-HADOOP-12751-leave-user-validation-to-os.patch, 
> 0003-HADOOP-12751-leave-user-validation-to-os.patch, 
> 0004-HADOOP-12751-leave-user-validation-to-os.patch, 
> 0005-HADOOP-12751-leave-user-validation-to-os.patch, 
> 0006-HADOOP-12751-leave-user-validation-to-os.patch, 
> 0007-HADOOP-12751-leave-user-validation-to-os.patch, 
> 0007-HADOOP-12751-leave-user-validation-to-os.patch, 
> 0008-HADOOP-12751-leave-user-validation-to-os.patch, 
> 0008-HADOOP-12751-leave-user-validation-to-os.patch, HADOOP-12751-009.patch
>
>
> In the scenario of a trust between two directories, eg. FreeIPA (ipa.local) 
> and Active Directory (ad.local) users can be made available on the OS level 
> by something like sssd. The trusted users will be of the form 'user@ad.local' 
> while other users are will not contain the domain. Executing 'id -Gn 
> user@ad.local' will successfully return the groups the user belongs to if 
> configured correctly. 
> However, it is assumed by Hadoop that users of the format with '@' cannot be 
> correct. This code is in KerberosName.java and seems to be a validator if the 
> 'auth_to_local' rules are applied correctly.
> In my opinion this should be removed or changed to a different kind of check 
> or maybe logged as a warning while still proceeding, as the current behavior 
> limits integration possibilities with other standard tools.
> Workaround are difficult to apply (by having a rewrite by system tools to for 
> example user_ad_local) due to down stream consequences.



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