linux-kernel - Re: [PATCH v3] landlock: Add abstract unix socket connect restriction

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Message-ID: <20240614.128b8d9046fd@gnoack.org>
Date: Fri, 14 Jun 2024 22:04:56 +0200
From: Günther Noack <gnoack3000@...il.com>
To: Mickaël Salaün <mic@...ikod.net>
Cc: Jann Horn <jannh@...gle.com>, Tahera Fahimi <fahimitahera@...il.com>,
	Günther Noack <gnoack@...gle.com>,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org,
	Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>, outreachy@...ts.linux.dev,
	netdev@...r.kernel.org,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>
Subject: Re: [PATCH v3] landlock: Add abstract unix socket connect restriction

On Tue, Jun 11, 2024 at 10:19:20AM +0200, Mickaël Salaün wrote:
> On Tue, Jun 11, 2024 at 12:27:58AM +0200, Jann Horn wrote:
> > This reminds me - from what I remember, Landlock also doesn't restrict
> > access to filesystem-based unix sockets yet... I'm I'm right about
> > that, we should probably at some point add code at some point to
> > restrict that as part of the path-based filesystem access rules? (But
> > to be clear, I'm not saying I expect you to do that as part of your
> > patch, just commenting for context.)
> 
> Yes, I totally agree.  For now, unix socket binding requires to create
> the LANDLOCK_ACCESS_FS_MAKE_SOCK right, but connecting to an existing
> socket is not controlled.  The abstract unix socket scoping is
> orthogonal and extends Landlock with unix socket LSM hooks, which are
> required to extend the "filesystem" access rights to control path-based
> unix socket.

Thanks for the reminder, Jann!  I filed it as
https://github.com/landlock-lsm/linux/issues/36.

–Günther