Server::process_request only checked that trusted_proxies_ was
non-empty before deriving req.remote_addr from the X-Forwarded-For
header. It never verified that the actual TCP peer (remote_addr) was
itself one of the trusted proxies, so any client connecting directly
to the server could spoof remote_addr simply by sending an arbitrary
X-Forwarded-For header.
Now X-Forwarded-For is only honored when the connecting peer address
matches an entry in trusted_proxies_.
fd0c18b1b5
