Re: Re-2: Is my script good and secure?

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Le lun 15/03/2004 à 15:32, netfilter@xxxxxxxxx a écrit :
> I changed some rules, some rules are removed and the position of the rules are
> changed. So i hope the script is more secure.

I did not see much change is the script you posted. I understand you may
not be familiar to Netfilter/iptables, but you could at least try your
scripts to see if they work...

> I wan't to use an separate file to be included like an blacklist of trajan ports,
> but i'm very new with iptables (work since one week with it).
> How i have to build the rule do include an seperate file with near of 351 entries of ports
> wich are used by trojans?
> How i have to build the file (like "65536   #Adore Worm/Linux" ??)



> iptables -N input_sperre
> iptables -N forward_sperre

I do not see the point in creating thoses chains. Just put the rules
directly in INPUT and FORWARD chains. Furthermore, you do not use theses
two chains in you script.

> iptables -A sperre -m state --state ESTABLISHED,RELATED -j ACCEPT

sperre chain does not exist anymore.

> iptables -A sperre -i eth1 --dport
> 22,19,21,22,25,3389,1723,23000:23001 -j ACCEPT # Allow outbound only
> for specific ports

Syntax error, see previous email.

> iptables -A sperre -i lo -s 127.0.0.1/255.0.0.0 -j ACCEPT                         # Allow everything from loopback

See previous email.

> iptables -A sperre -i eth0 -s 192.168.1.0/255.255.255.0 -j DROP                   # Drop everyting how comes fro outside to inside  with LAN IP's

See previous email.

[...] Etc.

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