Date: Wed, 17 Sep 2014 07:57:10 +0100 From: David Chisnall <theraven@FreeBSD.org> To: Andriy Gapon <avg@FreeBSD.org> Cc: freebsd-stable List <stable@FreeBSD.org>, FreeBSD Current <freebsd-current@FreeBSD.org>, freebsd-desktop@FreeBSD.org Subject: Re: usb printer vs cups Message-ID: <CAD63233-305F-4080-8A5B-75F5FA05A085@FreeBSD.org> In-Reply-To: <5419238E.8050708@FreeBSD.org> References: <54133325.9070302@FreeBSD.org> <5419238E.8050708@FreeBSD.org>
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There are a couple of similar issues currently. The other one that =
comes to mind is that every X11 application that needs to use OpenGL (or =
similar) must open /dev/dri/{something}, but the default permissions =
only permit root.
The correct solution is probably to ship a devfs.conf that puts these =
devices in the a sensible group. For USB printers, we should probably =
have a printers group and make cupsd run with that group (or set the GUI =
of cups and printers to the same number if that's too difficult). =20
David
On 17 Sep 2014, at 07:00, Andriy Gapon <avg@FreeBSD.org> wrote:
>=20
> Soliciting help.
>=20
> -------- Forwarded Message --------
>=20
> =46rom my experience I think that cupsd executes backend tools with =
all uids and
> gids set to cups and no supplementary groups. In the case of USB =
printers the
> backends need to access /dev/usbctl and /dev/usb/foobar that =
corresponds to a
> printer. That means that the access to those devices must be somehow =
granted to
> cups:cups.
> How do people solve this? What kind of permissions / configuration do =
you use?
>=20
> P.S.
> Maybe I over-generalized the issue to all USB printers. My personal =
experience
> is with an HP printer handled by hplip / hplip-plugin.
> --=20
> Andriy Gapon
>=20
>=20
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