Subject: Re: NFS and reserved ports
To: Jonathan Stone <>
From: Perry E. Metzger <>
List: tech-kern
Date: 03/24/1997 19:36:15
Jonathan Stone writes:
> >I do not disagree that NFS security is low, however, without random
> >generation numbers, it doesn't exist at all -- anyone on the internet
> >can grab your files.
> But the behaviour of checking mount requests and not the actual RPCS
> is broken. Why don't we *fix* it?  We could change the NFS server to
> check the ACLs for each NFS RPC, rather than just checking the mount
> requests?

1) way too slow.
2) what if someone, wanting to get access to your machine, simply
   forges a write request? Its not like IP source addresses are real
   authentication, anyway. Random generation numbers help a bit, but...

> (Or if it's ``too slow'', adding an option to do the
> checks, defaulting to "do the /exports ACL checks".)

If you only turn it off all the time, what was the point?