Re: allow process or user to listen on priviledged ports?

[Eric <eric@cisu.net>]

On Wednesday 24 December 2003 03:34 pm, Adam Sampson wrote:
> Sven Köhler <skoehler@upb.de> writes:
> > So is there any machanism to bind that permission (to listen on a
> > priviledged tcp-port) to a specific user or a specific process?
>
> Even if you can't find a way to do this, you can cheat: use an
> iptables DNAT rule to translate connections to the desired port into
> connections to a non-privileged port upon which your daemon is
> actually listening. Something like:
>
> iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to 1.2.3.4:8080
 Not to be too picky, but I think the redirect target is better suited for 
this. I haven't seen the source, but I assume it will be more efficient 
because it knows the destination is the local machine. 
iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 22
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Eric Bambach
Eric at cisu dot net
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