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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, 04 Jan 2017 00:07:58 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-13805.04.patch

Patch 4 attached.

Tested this by running downstream smokes etc, didn't see any failure. But found out there's
a existing test {{TestUGIWithMiniKdc}} that needs update.

bq.  The renewal thread should not be started if there is no keytab, there is no point to
do so because it will not have the credentials (the info in the keytab) at renewal time.
[~tucu00] please correct me if I'm wrong, the renewal thread is doing {{kinit -R}} so a TGT
would be sufficient, and keytab doesn't need to be renewed or present for the tgt renewal,
right? In any case, I agree with your initial proposal of having this done in HADOOP-13807
- feels cleaner and more separated :)

> 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
>         Attachments: HADOOP-13805.01.patch, HADOOP-13805.02.patch, HADOOP-13805.03.patch,
HADOOP-13805.04.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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