From: "J. Bruce Fields" <bfields@fieldses.org>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Jan Engelhardt <jengelh@computergmbh.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: NFS4 authentification / fsuid
Date: Thu, 30 Aug 2007 17:44:31 -0400 [thread overview]
Message-ID: <20070830214431.GF10808@fieldses.org> (raw)
In-Reply-To: <1188486240.6755.51.camel@heimdal.trondhjem.org>
On Thu, Aug 30, 2007 at 11:04:00AM -0400, Trond Myklebust wrote:
> With CIFS or other password based protocols (including RPCSEC_GSS)
Well, rpcsec_gss isn't inherently password based, and you can
authenticate in some way that doesn't actually give away your password
(or other long-lived credential).
> What I'm saying is that the superuser can pretty much do whatever it
> takes to grab either your kerberos password (e.g. install a keyboard
> listener), a stored credential (read the contents of your kerberos
> on-disk credential cache), or s/he can access the cached contents of the
> file by hunting through /dev/kmem.
>
> IOW: There is no such thing as security on a root-compromised machine.
And in theory a kernel could provide *some* guarantees against root,
right? (Is there some reason a unix-like kernel must provide such
things as /dev/kmem?)
--b.
next prev parent reply other threads:[~2007-08-30 21:44 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-30 14:12 NFS4 authentification / fsuid Jan Engelhardt
2007-08-30 14:29 ` Trond Myklebust
2007-08-30 14:32 ` Trond Myklebust
2007-08-30 14:42 ` Jan Engelhardt
2007-08-30 15:04 ` Trond Myklebust
2007-08-30 21:44 ` J. Bruce Fields [this message]
2007-09-06 8:14 ` Satyam Sharma
2007-09-06 8:29 ` Satyam Sharma
2007-09-06 15:11 ` J. Bruce Fields
2007-09-06 23:21 ` Trond Myklebust
2007-09-06 23:32 ` Trond Myklebust
2007-09-07 15:34 ` J. Bruce Fields
2007-09-18 23:27 ` Satyam Sharma
2007-09-18 23:12 ` Satyam Sharma
2007-09-06 15:06 ` J. Bruce Fields
2007-09-06 23:30 ` Kyle Moffett
2007-09-06 23:35 ` Trond Myklebust
2007-09-07 0:56 ` Kyle Moffett
2007-09-07 5:14 ` Trond Myklebust
2007-09-07 5:47 ` Kyle Moffett
2007-09-07 6:37 ` Bernd Eckenfels
2007-09-18 23:48 ` Satyam Sharma
2007-09-18 23:44 ` Satyam Sharma
2007-09-19 5:16 ` Kyle Moffett
2007-09-19 12:16 ` Satyam Sharma
2007-09-19 13:49 ` Kyle Moffett
2007-09-19 14:12 ` Satyam Sharma
2007-09-19 15:01 ` J. Bruce Fields
2007-09-20 7:03 ` Satyam Sharma
2007-09-19 16:38 ` Valdis.Kletnieks
2007-09-20 7:15 ` Satyam Sharma
2007-08-30 15:12 ` J. Bruce Fields
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