From mboxrd@z Thu Jan  1 00:00:00 1970
From: Matthias Schwarzott <zzam@gentoo.org>
Date: Wed, 05 Aug 2009 16:47:28 +0000
Subject: Re: selectively disabling ACLs
Message-Id: <200908051847.28614.zzam@gentoo.org>
List-Id: <linux-hotplug.vger.kernel.org>
References: <20090805141654.GF6336@nostromo.devel.redhat.com>
In-Reply-To: <20090805141654.GF6336@nostromo.devel.redhat.com>
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To: linux-hotplug@vger.kernel.org

On Mittwoch, 5. August 2009, Kay Sievers wrote:
> On Wed, Aug 5, 2009 at 16:16, Bill Nottingham<notting@redhat.com> wrote:
> > In the old HAL days, it was reasonable to configure which devices
> > would and would not get ownership/ACLs applied at the system level,
> > as HAL contained system level customization (via FDIs) to set this.
> >
> > As I look at the current code in udev, I don't see a good way to
> > override this. The only infrastructure is a 70-acl.rules file
> > that has:
> >
> > ...
> > # optical drives
> > SUBSYSTEM=3D"block", ENV{ID_CDROM}=3D"1", ENV{ACL_MANAGE}=3D"1"
> >
> > # sound devices
> > SUBSYSTEM=3D"sound", ENV{ACL_MANAGE}=3D"1"
> > ...
> > # apply ACL for all locally logged in users
> > LABEL=3D"acl_apply", ENV{ACL_MANAGE}=3D"?*",
> > # TEST=3D"/var/run/ConsoleKit/database", \
> > =C2=A0RUN+=3D"udev-acl --action=3D$env{ACTION} --device=3D$env{DEVNAME}"
> >
> > ...
> >
> > The only way I can see to disable ACLs, for, say, a webcam, would
> > be to write a rule that runs *before* this rules file, that sets
> > last_rule. That's quite a hack.
> >
> > Is there a better way to set this that I don't see?
>
> I guess the current logic could just check ACL_MANAGE=3D0, and skip the
> device if that is set?
>
Then one has to copy possibly complicated matching logic just to revert the=
=20
result.
Why not let the match rules set some kind of ACL_CLASS to some user friendl=
y=20
name. (examples: block, sound, ptp, mtp, scanner, printer, optical, v4l,=20
dvb, ...)

That way one can add rules like this to disable acl for joysticks
ENV{ACL_MANAGE}=3D"1", ENV{ACL_CLASS}=3D"joystick", ENV{ACL_MANAGE}=3D"0"

Matthias