Re: Proposal: Improving Security for HTTP Ingress to CFAR Application Containers

Eric Malm <emalm@...>

We would probably not deploy the improved http ingress until tcp and ssh are both working.  Our priority from the improvements in http ingress have been more on the reliable side and less on the security side.  We haven't run into any NATS mis-routing requests issues for a while and we do have TCP customers.  So, we would probably prefer to keep riding our current NATS good luck streak than disrupt our TCP customers.

Great, thanks for letting me know. Just to clarify, route integrity on its own (enabled via is intended primarily to improve HTTP routing reliability in the face of NATS and other component failures, and is still compatible with both CF SSH and TCP routing. This proposed more secure mode is an opt-in configuration that depends on but is separate from that "basic" route integrity.

Also, we on the Diego team think that we've finally finished ironing out a minor edge case around making sure incoming requests are handled correctly when app instances are being shutdown gracefully, so we expect to work with Release Integration in the next month or so to promote that route-integrity ops file to be a stable one and then later to be the default configuration in cf-deployment.
That's perfect.  We don't use the port.

Some examples where cell ip address has come in handy:
* Mostly firewall debugging.  Our firewall situation is a mess.  Lots of manual work and issues to debug where sometimes knowing the specific cell ip address can help in debugging a problem.
* Occasionally customers want to do tcpdumps from a destination server.  The ip of the cell hosting the source app instance helps reduce the tcpdump scope.  Unfortunately, in tcpdump situations the CF operations team usually gets involved anyway to grab a tcpdump from the cell side since last time I checked we couldn't take tcpdumps from in a container.  So, these scenarios are usually not very self service anyway.

Hope that helps.

Certainly, thanks for the details!


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