[jira] [Created] (YARN-7590) Improve container-executor validation check

["Eric Yang (JIRA)" <ji...@apache.org>]

Eric Yang created YARN-7590:
-------------------------------

             Summary: 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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