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https://issues.apache.org/jira/browse/MAPREDUCE-2858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13127998#comment-13127998
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Luke Lu commented on MAPREDUCE-2858:
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bq. That is a MUCH simpler model and provides the same level of security.
It's actually bit more complex, as the proxy needs to maintain a consistent
cache of appid to appmaster mapping from RM. The current approach is simpler in
that regard, as it doesn't need to maintain any state. If the target is not
available, the proxy can display a reasonable message and redirect the user to
the RM (a configured trusted url) for the current links. Another reason that I
went with the generic security proxy approach is that it can also be used to
proxy webapps on NMs, so that we can lock down (via firewall) the entire
cluster (only allow webapp access via trusted nodes.) if we choose to (so no
redirection scheme to untrusted nodes inside the cluster is possible).
> MRv2 WebApp Security
> --------------------
>
> Key: MAPREDUCE-2858
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2858
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: applicationmaster, mrv2, security
> Affects Versions: 0.23.0
> Reporter: Luke Lu
> Assignee: Luke Lu
> Priority: Blocker
> Fix For: 0.23.0
>
>
> In MRv2, while the system servers (ResourceManager (RM), NodeManager (NM) and
> NameNode (NN)) run as "trusted"
> system users, the application masters (AM) run as users who submit the
> application. While this offers great flexibility
> to run multiple version of mapreduce frameworks (including their UI) on the
> same Hadoop cluster, it has significant
> implication for the security of webapps (Please do not discuss company
> specific vulnerabilities here).
> Requirements:
> # Secure authentication for AM (for app/job level ACLs).
> # Webapp security should be optional via site configuration.
> # Support existing pluggable single sign on mechanisms.
> # Should not require per app/user configuration for deployment.
> # Should not require special site-wide DNS configuration for deployment.
> This the top jira for webapp security. A design doc/notes of threat-modeling
> and counter measures will be posted on the wiki.
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