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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2856) Fix block protocol so that Datanodes don't require root or jsvc
Date Thu, 02 May 2013 15:30:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13647626#comment-13647626
] 

Owen O'Malley commented on HDFS-2856:
-------------------------------------

Chris, can you update the document with a read path? 

We should also include the current timestamp from the client to the datanode (both directly
and in the hmac) to make replay attacks harder.
                
> Fix block protocol so that Datanodes don't require root or jsvc
> ---------------------------------------------------------------
>
>                 Key: HDFS-2856
>                 URL: https://issues.apache.org/jira/browse/HDFS-2856
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode, security
>            Reporter: Owen O'Malley
>            Assignee: Chris Nauroth
>            Priority: Blocker
>         Attachments: Datanode-Security-Design.pdf
>
>
> Since we send the block tokens unencrypted to the datanode, we currently start the datanode
as root using jsvc and get a secure (< 1024) port.
> If we have the datanode generate a nonce and send it on the connection and the sends
an hmac of the nonce back instead of the block token it won't reveal any secrets. Thus, we
wouldn't require a secure port and would not require root or jsvc.

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