From: Joachim Schipper (j.schipper@math.uu.nl)
Date: Tue Jan 24 2006 - 04:56:34 EST
On Mon, Jan 23, 2006 at 10:44:52PM +0100, poplix wrote:
> Hi there,
>
> I wish to propose an alternative to port knoking that uses the native
> OpenBSD's pf code only. The idea is to use the pf's passive os
> fingerprinter to authenticate initial SYN packets.
> With a tool (or kernel patch) able to rewrite packets header is possible
> to use a specific sequence of header fields as a key to validate
> packets.
This is an interesting - albeit not exactly new - idea, but it has the
very real disadvantage over port knocking that it requires priviliges
(typically root) on the connecting host.
Joachim
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