Re: Allow Proxy connection

[Ray Leach <raymondl@knowledgefactory.co.za>]

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I use similar rules except:

<snip>

> iptables -A OUTPUT -o eth0 -p tcp --dport 80:90 -m state --state
> NEW,ESTABLISHED -j ACCEPT
> iptables -A INPUT  -i eth0 -p tcp --sport 80:90 -m state --state
> ESTABLISHED     -j ACCEPT
> 
Then of course there's also port 8080 for tomcat and 443 for SSL with
similar rules.

Since you are using state matching, only established connections are
allowed back in.

> But this works only if the webserver in the internet is running on port
> 80. So i tried to use the -m owner --uid-owner option to match all
> packets from the proxy user. The i had to accept all ESTABLISHED packets
> in the INPUT chain, because the owner match works only in OUTPUT chain.
> 
> What i did now is the following:
> 
> iptables -A OUTPUT -o eth0 -p tcp -m owner --uid-owner proxy -m state
> --state NEW -j CONNARK --set-mark 1
> iptables -A OUTPUT -o eth0 -m connmark --mark 1 -j ACCEPT
> iptables -A INPUT  -i eth0 -m connmark --mark 1 -j ACCEPT
> 
> This seems to work, but what i wann know now:
>  - Is this solution secure?
>  - Anybody got a better solution?
> 
> Regards
> Sebastian.
-- 
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Raymond Leach <raymondl@knowledgefactory.co.za>
Network Support Specialist
http://www.knowledgefactory.co.za
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