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https://issues.apache.org/jira/browse/YARN-7590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16275221#comment-16275221
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Eric Yang commented on YARN-7590:
---------------------------------
[~ebadger]
{quote}
I've brought this up in the past (can't remember where) and it didn't get
anywhere. I believe there was a reason that we didn't want yarn-site.xml to be
owned by root. Possibly because it would break current deploys?
{quote}
I don't think there is a hard requirement that yarn-site.xml must be owned by
yarn user. This may have been miscommunication. My clusters have been using
root:hadoop, 644 for yarn-site.xml for most of the past 5 years.
[[email protected]] +1 on option 3. It is smart and safe way to
validate the prefix directory with minimum amount of code change.
[~andrew.wang] This JIRA assumes YARN is compromised. Theoretical
interpretation doesn't make this reality yet. I don't believe this is a
blocker. Versions are set accordingly.
> 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
> Reporter: Eric Yang
>
> 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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