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Remus Rusanu commented on YARN-2198: ------------------------------------ RB https://reviews.apache.org/r/23334/ > 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-2198.1.patch > > > 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. -- This message was sent by Atlassian JIRA (v6.2#6252)