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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7590) Improve container-executor validation check
Date Thu, 14 Dec 2017 00:26:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16290142#comment-16290142
] 

Eric Yang commented on YARN-7590:
---------------------------------

[~miklos.szegedi@cloudera.com] Thank you for the review.  I revised the code to preserve uid
during program startup per your suggestion.  Let me know if this works.  Thanks.

> Improve container-executor validation check
> -------------------------------------------
>
>                 Key: YARN-7590
>                 URL: https://issues.apache.org/jira/browse/YARN-7590
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: security, yarn
>    Affects Versions: 2.0.1-alpha, 2.2.0, 2.3.0, 2.4.0, 2.5.0, 2.6.0, 2.7.0, 2.8.0, 2.8.1,
3.0.0-beta1
>            Reporter: Eric Yang
>            Assignee: Eric Yang
>         Attachments: YARN-7590.001.patch, YARN-7590.002.patch
>
>
> There is minimum check for prefix path for container-executor.  If YARN is compromised,
attacker  can use container-executor to change system files ownership:
> {code}
> /usr/local/hadoop/bin/container-executor spark yarn 0 etc /home/yarn/tokens /home/spark
/ ls
> {code}
> This will change /etc to be owned by spark user:
> {code}
> # ls -ld /etc
> drwxr-s---. 110 spark hadoop 8192 Nov 21 20:00 /etc
> {code}
> Spark user can rewrite /etc files to gain more access.  We can improve this with additional
check in container-executor:
> # Make sure the prefix path is same as the one in yarn-site.xml, and yarn-site.xml is
owned by root, 644, and marked as final in property.
> # Make sure the user path is not a symlink, usercache is not a symlink.



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