Date: Tue, 27 Apr 2010 20:41:00 +0200 From: Roland Smith <rsmith@xs4all.nl> To: Demelier David <demelier.david@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: geli_devices entry in rc.conf Message-ID: <20100427184059.GA17523@slackbox.erewhon.net> In-Reply-To: <20100427102615.GA89418@Melon.malikania.fr> References: <20100427102615.GA89418@Melon.malikania.fr>
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On Tue, Apr 27, 2010 at 12:26:16PM +0200, Demelier David wrote:
> Hi freebsd-questions@,
>=20
> I made some encryption on my USB mass storage, so I wanted to know if =
we can
> geli {attach,detach} as user ? Since we can mount devices as user it w=
ould be
> great for geli too.
It seems that GEOM works by calling ioctl on /dev/geom.ctl. Maybe it it
possible to get non-root access by changing the permissions
on the /dev/geom.ctl device? But that would possibly enable those users to =
carry out
all geom actions, which is probably not a good thing from a security standp=
oint.
=20
> And what about the geli_devices in rc.conf the manpage says it attache=
s at
> the boot process, so if the storage disk is not here will the geli att=
ach if
> I plug it after the boot ?
No. It just lists and handles the devices available at that time.
You might be able to do something with devd? It should be possible to write=
a
script that is to be called via devd once a disk device is available. That
script then should prompt the user (e.g. via xdialog) if a geli-encrypted
device is found. I'm not sure how to distinguish geli devices from non-geli
devices, though.=20
Additionally, even though the disk system in 8.x doesn't panic anymore when
one removes a mounted USB drive, I'm not sure how well geli would handle th=
at.
Roland
--=20
R.F.Smith http://www.xs4all.nl/~rsmith/
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