Re: ipfw and ipsec processing order for outgoing packets wrong
From: Joost Bekkers (joost_at_jodocus.org)
Date: 10/30/04
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Date: Sat, 30 Oct 2004 23:42:12 +0200 To: Ari Suutari <ari@suutari.iki.fi>
On Sat, Oct 30, 2004 at 09:27:50AM +0300, Ari Suutari wrote:
> Hi,
>
> I noticed that processing order of ipsec and ipfw (pfil_hook) is not
> correct for outgoing packets. Currently, ipsec processing is done first,
> which makes packets to go through without firewall inspection.
> This might be a security problem for someone, but at least it
> breaks stateful rule handling.
>
> My test setup is (all freebsd 5.3-rc1 machines):
>
> freebsd laptop <-> ipsec tunnel <->freebsd server
>
> When server sends packet to laptop, it now goes like this:
>
> ip_output -> ipsec -> ip_output -> ipfw -> network
>
> It should go like this:
>
> ip_output -> ipfw -> ipsec -> ip_output -> ipfw -> network
>
> I think that this could be fixed by just moving pfil_hook
> processing in ip_output before ipsec processing.
>
I've been pondering the same issue and am currently running 5.3-R modified in the
way you've described. (diff at http://jodocus.org/ipsec-pfil.diff I'm not an
experienced kernel-hacker, so use at own risk)
For IPSEC this also means that the resulting ESP and AH packets don't traverse the
firewall when leaving the system. (at least if I read the code correctly; not tested)
With FAST_IPSEC both the original and the resulting ESP/AH packets traverse the
firewall.
In my case I also stumbled on a nice FAST_IPSEC feature where the decoded packets
seemed to arrive through the corresponding gif* interface. (with tunnel-mode ipsec)
-- greetz Joost joost@jodocus.org _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
- Previous message: Ari Suutari: "ipfw and ipsec processing order for outgoing packets wrong"
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