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Message-ID: <7e499dd1deafcf043229973968920947453d4eba.camel@kernel.org>
Subject: Re: SELinux-Support in Linux NFSv4.1 impl?
From: Jeff Layton <jlayton@kernel.org>
To: Guy Keren <guy@vastdata.com>
Cc: linux-nfs <linux-nfs@vger.kernel.org>
Date: Sun, 18 Feb 2024 09:35:01 -0500
In-Reply-To: <CAENext6Zuv0pLgzp_vcBqdKmrH6Bg5GDV_hnUNOeFK2juoiJnw@mail.gmail.com>
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On Sun, 2024-02-18 at 16:16 +0200, Guy Keren wrote:
> On Sun, Feb 18, 2024 at 3:55=E2=80=AFPM Jeff Layton <jlayton@kernel.org> =
wrote:
> >=20
> > On Sat, 2024-02-17 at 14:37 +0100, Martin Wege wrote:
> > > On Wed, Feb 14, 2024 at 12:28=E2=80=AFPM Jeff Layton <jlayton@kernel.=
org> wrote:
> > > >=20
> > > > On Wed, 2024-02-14 at 10:46 +0100, Martin Wege wrote:
> > > > > Hello,
> > > > >=20
> > > > > Does the Linux implementation server&client for NFSv4.1 support S=
ELinux?
> > > > >=20
> > > > >=20
> > > >=20
> > > > Labeled NFS is a NFSv4.2 feature. The Linux client and server do su=
pport
> > >=20
> > > Is there documentation on how to set this up? Will this work if the
> > > root fs ('/') is NFSv4.2?
> > >=20
> >=20
> > There isn't much to set up. If you mount using NFSv4.2, the client and
> > server should negotiate using SELinux (assuming both are SELinux
> > enabled) and the SELinux contexts should (mostly) be projected across
> > the wire.
>=20
> Jeff - as far as i know, while it is possible for the client to
> get/set the secure labels of files on the server - there is no way for
> the client to tell the server which user is performing the specific
> access operation - so the 'FULL MODE' of nfs4.2 security labels cannot
> work - only the 'Limited Server Mode' mode (i.e. only the client
> verifies the security labels - the server does not). please correct me
> if i'm wrong.
>=20
>=20

(re-cc'ing the mailing list...)

That is correct. I'm not aware of anyone having implented "Full mode" as
of yet anywhere.

The Linux server is a "dumb" labeled NFS server that just projects the
contexts to the clients and doesn't try to do any enforcement.
--=20
Jeff Layton <jlayton@kernel.org>