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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2856) Fix block protocol so that Datanodes don't require root or jsvc
Date Thu, 09 May 2013 22:31:18 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13653324#comment-13653324
] 

Aaron T. Myers commented on HDFS-2856:
--------------------------------------

Thanks a lot for working on this issue, Chris. Two questions for you:

# In steps 5 and 6 of the proposed protocol, I think you may need to do an 's/block key/block
access token/g'. As you have it currently, if the server digest returned by the DN is based
on the block key directly, the client will not be able to recompute/verify the returned server
digest, since the client does not know the block key. However, the client does know the block
access token, and a properly authenticated DN will be able to recompute the block access token
based on the block key it shares with the NN.
# Did you consider at all scrapping our custom authentication protocol and instead switching
to using straight SASL MD5-DIGEST for the DataTransferProtocol? This is roughly what I did
to add support for encrypting the DataTransferProtocol in HDFS-3637.
                
> 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, Datanode-Security-Design.pdf, 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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