linux-kernel - NFS4 authentification / fsuid

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Message-ID: <Pine.LNX.4.64.0708301610290.24730@fbirervta.pbzchgretzou.qr>
Date:	Thu, 30 Aug 2007 16:12:47 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Trond Myklebust <trond.myklebust@....uio.no>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: NFS4 authentification / fsuid

Hi,

with NFS3, there is this 'root hole', i.e. any person who has a root 
account (perhaps by use of a laptop) can mount an export (let's say this 
export had the "root_squash" option), and still have a look at the user 
files, because he can locally setuid() into another user.

So I was looking for alternatives. CIFS is my favorite candidate, but it 
has a few issues right now. So does sshfs and about everything I have 
come across. Since I remember NFS4 can use KRB5 authentification, my 
question is, will the NFS(4) server process run with an fsuid equal to 
the user that authenticated?

thanks,
	Jan
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