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https://issues.apache.org/jira/browse/YARN-2198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14158260#comment-14158260
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Remus Rusanu commented on YARN-2198:
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thanks for the review [~jianhe]. I will address the issues, but here is the
answer to the nmPrivateClasspathJarDir : The NM process does not have the
privilege to write into the pwd folder. And the container process does not have
the privilege of reading from the NM private dir. Hence the ping-pong of NM
writing it in it's private dir, then using the elevated copy operation to move
it into the pwd.
> Remove the need to run NodeManager as privileged account for Windows Secure
> Container Executor
> ----------------------------------------------------------------------------------------------
>
> Key: YARN-2198
> URL: https://issues.apache.org/jira/browse/YARN-2198
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Remus Rusanu
> Assignee: Remus Rusanu
> Labels: security, windows
> Attachments: .YARN-2198.delta.10.patch, YARN-2198.1.patch,
> YARN-2198.2.patch, YARN-2198.3.patch, YARN-2198.delta.4.patch,
> YARN-2198.delta.5.patch, YARN-2198.delta.6.patch, YARN-2198.delta.7.patch,
> YARN-2198.separation.patch, YARN-2198.trunk.10.patch,
> YARN-2198.trunk.4.patch, YARN-2198.trunk.5.patch, YARN-2198.trunk.6.patch,
> YARN-2198.trunk.8.patch, YARN-2198.trunk.9.patch
>
>
> YARN-1972 introduces a Secure Windows Container Executor. However this
> executor requires the process launching the container to be LocalSystem or a
> member of the a local Administrators group. Since the process in question is
> the NodeManager, the requirement translates to the entire NM to run as a
> privileged account, a very large surface area to review and protect.
> This proposal is to move the privileged operations into a dedicated NT
> service. The NM can run as a low privilege account and communicate with the
> privileged NT service when it needs to launch a container. This would reduce
> the surface exposed to the high privileges.
> There has to exist a secure, authenticated and authorized channel of
> communication between the NM and the privileged NT service. Possible
> alternatives are a new TCP endpoint, Java RPC etc. My proposal though would
> be to use Windows LPC (Local Procedure Calls), which is a Windows platform
> specific inter-process communication channel that satisfies all requirements
> and is easy to deploy. The privileged NT service would register and listen on
> an LPC port (NtCreatePort, NtListenPort). The NM would use JNI to interop
> with libwinutils which would host the LPC client code. The client would
> connect to the LPC port (NtConnectPort) and send a message requesting a
> container launch (NtRequestWaitReplyPort). LPC provides authentication and
> the privileged NT service can use authorization API (AuthZ) to validate the
> caller.
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