Remus Rusanu created YARN-2198:
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Summary: 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
YARN-1972 introduces a Secure Windows Container Executor. However this executor
requires a 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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