From owner-freebsd-security@FreeBSD.ORG  Wed Jul  6 03:56:56 2005
Return-Path: <owner-freebsd-security@FreeBSD.ORG>
X-Original-To: freebsd-security@freebsd.org
Delivered-To: freebsd-security@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 5BCEA16A41C
	for <freebsd-security@freebsd.org>;
	Wed,  6 Jul 2005 03:56:56 +0000 (GMT)
	(envelope-from avalon@caligula.anu.edu.au)
Received: from caligula.anu.edu.au (caligula.anu.edu.au [150.203.224.42])
	by mx1.FreeBSD.org (Postfix) with ESMTP id DDF2A43D48
	for <freebsd-security@freebsd.org>;
	Wed,  6 Jul 2005 03:56:55 +0000 (GMT)
	(envelope-from avalon@caligula.anu.edu.au)
Received: from caligula.anu.edu.au (localhost [127.0.0.1])
	by caligula.anu.edu.au (8.12.9/8.12.9) with ESMTP id j663ueOw011745;
	Wed, 6 Jul 2005 13:56:40 +1000 (EST)
Received: (from avalon@localhost)
	by caligula.anu.edu.au (8.12.9/8.12.8/Submit) id j663ucHE011742;
	Wed, 6 Jul 2005 13:56:38 +1000 (EST)
From: Darren Reed <avalon@caligula.anu.edu.au>
Message-Id: <200507060356.j663ucHE011742@caligula.anu.edu.au>
To: rcoleman@criticalmagic.com (Richard Coleman)
Date: Wed, 6 Jul 2005 13:56:38 +1000 (Australia/ACT)
In-Reply-To: <42CAA33D.9080505@criticalmagic.com> from "Richard Coleman" at
	Jul 05, 2005 11:11:57 AM
X-Mailer: ELM [version 2.5 PL1]
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: freebsd-security@freebsd.org, Garrett Wollman <wollman@csail.mit.edu>,
	Jesper Wallin <jesper@www.hackunite.net>,
	Darren Reed <avalon@caligula.anu.edu.au>,
	=?ISO-8859-1?Q?Dag-Erling_?= =?ISO-8859-1?Q?Sm=F8rgrav?= <des@des.no>
Subject: Re: packets with syn/fin vs pf_norm.c
X-BeenThere: freebsd-security@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "Security issues \[members-only posting\]"
	<freebsd-security.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-security>, 
	<mailto:freebsd-security-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-security>
List-Post: <mailto:freebsd-security@freebsd.org>
List-Help: <mailto:freebsd-security-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-security>, 
	<mailto:freebsd-security-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 06 Jul 2005 03:56:56 -0000

In some mail from Richard Coleman, sie said:
> 1. I thought that T/TCP was being removed from FreeBSD (already happened?).
> 2. It's trivial to predict Theo's response to this.
> 3. Since T/TCP is rare, there is little motivation to alter scrub to 
> function differently than OpenBSD with respect to these packets.  If 
> someone really needs this, there are plenty of alternatives.

I didn't know about (1) but I'd agree with (2) and (3).

> But more importantly, the original question has been lost.  The original 
> question was what should the various firewalls do when the kernel has 
> been compiled with TCP_DROP_SYNFIN.  Regardless of whether those packets 
> are valid or not, a person may have reason to compile this feature into 
> the kernel.  So, should the firewalls acts differently if this kernel 
> option is used?

IMHO, No.

Darren