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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13805) UGI.getCurrentUser() fails if user does not have a keytab associated
Date Wed, 16 Nov 2016 07:01:58 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13805?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xiao Chen updated HADOOP-13805:
-------------------------------
    Attachment: HADOOP-13805.01.patch

Thanks [~tucu00] for the explanation.

It seems we should eliminate the scenarios that would make {{isKeytab}} true and {{keytabFile}}
null. I couldn't think of a better solution than you proposed - UGI class is {{LimitedPrivate}}
and the {{reloginFromXXX}} are public, so not much room for the change...

I'm attaching a preliminary patch 1 to collect feedback, will run a full unit test for better
coverage. Will also look for corner cases in the meantime.

> UGI.getCurrentUser() fails if user does not have a keytab associated
> --------------------------------------------------------------------
>
>                 Key: HADOOP-13805
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13805
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.8.0, 2.9.0, 3.0.0-alpha2
>            Reporter: Alejandro Abdelnur
>            Assignee: Xiao Chen
>            Priority: Blocker
>         Attachments: HADOOP-13805.01.patch
>
>
> HADOOP-13558 intention was to avoid UGI from trying to renew the TGT when the UGI is
created from an existing Subject as in that case the keytab is not 'own' by UGI but by the
creator of the Subject.
> In HADOOP-13558 we introduced a new private UGI constructor {{UserGroupInformation(Subject
subject, final boolean externalKeyTab)}} and we use with TRUE only when doing a {{UGI.loginUserFromSubject()}}.
> The problem is, when we call {{UGI.getCurrentUser()}}, and UGI was created via a Subject
(via the {{UGI.loginUserFromSubject()}} method), we call {{new UserGroupInformation(subject)}}
which will delegate to {{UserGroupInformation(Subject subject, final boolean externalKeyTab)}}
 and that will use externalKeyTab == *FALSE*. 
> Then the UGI returned by {{UGI.getCurrentUser()}} will attempt to login using a non-existing
keytab if the TGT expired.
> This problem is experienced in {{KMSClientProvider}} when used by the HDFS filesystem
client accessing an an encryption zone.



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