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

[gimeshell () web de]

On Tue, 24 Jan 2006 10:56:34 +0100
Joachim Schipper <j.schipper () math uu nl> wrote:

> 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.

I'm fairly new to network security so i'm
wondering what's the problem using root priviliges to connect to server?
Do you mean, this is a general security problem or simply a client-side
disadvantage?
Do you think, running such a packet rewriter on client-side opens new
doors for attackers and reduces client-side security thus?

regards

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