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[libvirt] NBD TLS support in QEMU

QEMU offers both NBD client and server functionality.  The NBD protocol
runs unencrypted, which is a problem when the client and server
communicate over an untrusted network.

The particular use case that prompted this mail is storage migration in
OpenStack.  The goal is to encrypt the NBD connection between source and
destination hosts during storage migration.

I think we can integrate TLS into the NBD protocol as an optional flag.
A quick web search does not reveal existing open source SSL/TLS NBD
implementations.  I do see a VMware NBDSSL protocol but there is no
specification so I guess it is proprietary.

The NBD protocol starts with a negotiation phase.  This would be the
appropriate place to indicate that TLS will be used.  After client and
server complete TLS setup the connection can continue as normal.

Besides QEMU, the userspace NBD tools (http://nbd.sf.net/) can also be
extended to support TLS.  In this case the kernel needs a localhost
socket and userspace handles TLS.



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