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https://issues.apache.org/jira/browse/HDFS-2617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13161352#comment-13161352
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Aaron T. Myers commented on HDFS-2617:
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Hey Jakob, I think getting rid of KSSL (e.g. replacing it with SPNEGO) would be
a huge improvement. But, I'd like to propose an alternate design which should
be just as secure, and potentially simpler to implement.
Given that a checkpoint by the 2NN already has to do a few RPCs before the
transfer of the fsimage/edits (to, e.g. initiate an edits log roll), we could
easily generate a shared secret token between the NN and 2NN in this RPC, which
then could be included as a URL parameter during the fsimage/edits transfers
over HTTP. I suspect this will be easier to implement, is just as secure as
SPNEGO/KSSL since when security is enabled the RPCs creating the secret token
will be authenticated, and has the advantage of making checkpoints execute the
same code paths with or without security enabled.
Thoughts?
> Replaced Kerberized SSL for image transfer and fsck with SPNEGO-based solution
> ------------------------------------------------------------------------------
>
> Key: HDFS-2617
> URL: https://issues.apache.org/jira/browse/HDFS-2617
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Jakob Homan
> Assignee: Jakob Homan
>
> The current approach to secure and authenticate nn web services is based on
> Kerberized SSL and was developed when a SPNEGO solution wasn't available. Now
> that we have one, we can get rid of the non-standard KSSL and use SPNEGO
> throughout. This will simplify setup and configuration. Also, Kerberized
> SSL is a non-standard approach with its own quirks and dark corners
> (HDFS-2386).
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