[systemd-devel] [PATCH] Add a network-pre.target to avoid firewall leaks

[Djalal Harouni]

On Sat, Jun 07, 2014 at 07:27:32PM -0400, Leonid Isaev wrote:
> On Sun, Jun 08, 2014 at 01:07:38AM +0200, Zbigniew Jędrzejewski-Szmek wrote:
> > Date: Sun, 8 Jun 2014 01:07:38 +0200
> > From: Zbigniew Jędrzejewski-Szmek <zbyszek at in.waw.pl>
> > To: Michael Biebl <mbiebl at gmail.com>
> > Cc: systemd Mailing List <systemd-devel at lists.freedesktop.org>
> > Subject: Re: [systemd-devel] [PATCH] Add a network-pre.target to avoid
> >  firewall leaks
> > User-Agent: Mutt/1.5.20 (2009-06-14)
> > 
> > On Sun, Jun 08, 2014 at 12:55:55AM +0200, Michael Biebl wrote:
> > > Could you elaborate why Before=network.target is too late?
> > Because then network setup races with e.g. iptables setup. Depending
> > on the timing, a window in which the network has been set up, but
> > the firewall is not yet in place.
> 
> But by the time network.target is reached there are no listening services yet,
> are there? So, why would one need a firewall?
Yes besides races, there are also setups that send packets before a given
interface is fully initialized, and also multi-stage configuration...
note to mention tools that just do raw packets...



> Thanks,
> Leonid.
> 
> -- 
> Leonid Isaev
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-- 
Djalal Harouni
http://opendz.org