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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11053) Unnecessary superuser check in versionRequest()
Date Tue, 25 Oct 2016 21:25:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15606527#comment-15606527
] 

Kihwal Lee commented on HDFS-11053:
-----------------------------------

The check was added in the process of fixing HDFS-2264.

> Unnecessary superuser check in versionRequest()
> -----------------------------------------------
>
>                 Key: HDFS-11053
>                 URL: https://issues.apache.org/jira/browse/HDFS-11053
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode, security
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>         Attachments: HDFS-11053.patch
>
>
> The {{versionRequest()}} call does not return any sensitive information.  It is mainly
used for sanity checks.   The presence of {{checkSuperuserPrivilege()}} forces users to run
datanode as a hdfs superuser.
> In secure setup, a keytab obtained from a compromised datanode can allow the intruder
to gain hdfs superuser privilege.  We should allow datanodes to be run as non-hdfs-superuser
by removing {{checkSuperuserPrivilege()}} from {{versionRequest()}}.



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