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https://issues.apache.org/jira/browse/HDFS-11069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15612304#comment-15612304
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Kihwal Lee commented on HDFS-11069:
-----------------------------------
{code}
private void checkSuperuserPrivilege() {
...
if (callerUgi.getShortUserName().equals(dnUserName)) {
return;
}
...
{code}
Instead of checking only the short name, the full name should be checked. E.g.
{{dn_user/datanode01.yourdomain....@yourdomain.com}} instead of simply
{{dn_user}}.
> Tighten the authorization of datanode RPC
> -----------------------------------------
>
> Key: HDFS-11069
> URL: https://issues.apache.org/jira/browse/HDFS-11069
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode, security
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
>
> The current implementation of {{checkSuperuserPrivilege()}} allows the
> datanode user from any node to be recognized as a super user. If one
> datanode is compromised, the intruder can issue {{shutdownDatanode()}},
> {{evictWriters()}}, {{triggerBlockReport()}}, etc. against all other
> datanodes.
> This needs to be tightened to allow only the local datanode user.
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