netdev - Re: Passive OS fingerprint xtables match.

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Message-ID: <49B78A4D.4060703@netfilter.org>
Date:	Wed, 11 Mar 2009 10:54:21 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Evgeniy Polyakov <zbr@...emap.net>
CC:	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>,
	Jan Engelhardt <jengelh@...ozas.de>
Subject: Re: Passive OS fingerprint xtables match.

Evgeniy Polyakov wrote:
> Hi.
> 
> Passive OS fingerprinting netfilter module allows to passively detect
> remote OS and perform various netfilter actions based on that knowledge.
> This module compares some data (WS, MSS, options and it's order, ttl, df
> and others) from packets with SYN bit set with dynamically loaded OS
> fingerprints.
> 
> Fingerprint matching rules can be downloaded from OpenBSD source tree
> and loaded via netlink connector into the kernel via special util found
> in archive. It will also listen for events about matching packets.

I like this feature. We have nfnetlink so I don't see why we should use
the netlink connector instead.

BTW, is there any difference with regards to userspace p0f apart from
having this integrated into iptables?

-- 
"Los honestos son inadaptados sociales" -- Les Luthiers
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