Re: an anternative to port-knoking using the OpenBSD pf only

[Joachim Schipper <j.schipper () math uu nl>]

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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