Re: Susefirewall limit connections

On Sun, Nov 16, 2014 at 11:38:17AM +0800, Otto Rodusek wrote:
> Hi ListMates,
> 
> I have a large number of attacks on my customer's ports (10022,
> 5901, 5904) running OpenSuse 13.1 x64.
> 
> Basically I would like the firewall to allow no more than 5 attempts
> per 60 second period (or 1 attempt per 12 seconds), after which I
> would like the firewall to PERMENANTLY LOCK out the attempting IP.
> I'm not sure whether this can be done via the SuseFirewall or
> whether I need to write a script to do it.
> 
> I have tried a couple methods with the following script BUT I still
> get several (thousands) attempts in my firewall logs.
> 
> Any suggestions?
> 
> Thanks and best regards. Otto.

You already use the ipt_recent table rule ... Do not see where the issue
is, perhaps the default action is still triggered.

You can debug this with iptables -v -L and check the hitcount on the rules
on which trigger.

In SUSE firewall 
remove ssh from FW_SERVICES_ACCEPT, readd it to:
FW_SERVICES_ACCEPT_EXT="0/0,tcp,22,,hitcount=5,blockseconds=300,recentname=ssh"

And instead of "22" and "ssh" you can use your ports and a logname, rules seperated by spaces.

Ciao, Marcus
 
> ---------Start of bash script-----------
> #!/bin/bash
> 
> #####command to use
> IPT=/usr/sbin/iptables
> 
> #####Max connection in seconds
> SECONDS=60
> 
> #####Max connections per IP
> BLOCKCOUNT=5
> 
> #####default action can be DROP or REJECT
> DACTION="DROP"
> 
> #####default port to monitor (if not input)
> PORT=10022
> 
> if [ $# = 1 ]
> then
>   PORT=$1
> fi
> 
> #####method 1
> $IPT -A INPUT -p tcp --dport ${PORT} -m state --state NEW -m recent
> --set --name rule${PORT}
> $IPT -A INPUT -p tcp --dport ${PORT} -m state --state NEW -m recent
> --update --name rule${PORT} \
>      --seconds ${SECONDS} --hitcount ${BLOCKCOUNT} -j ${DACTION}
> 
> #####method 2
> #$IPT -A INPUT -p tcp --dport ${PORT} -m state --state NEW -m recent --set
> #
> #$IPT -A INPUT -p tcp --dport ${PORT} -m state --state NEW -m recent
> --rcheck \
> #     --seconds ${SECONDS} --hitcount ${BLOCKCOUNT} -j REJECT
> --reject-with icmp-port-unreachable
> 
> ---------End of bash script-----------
> -- 
> To unsubscribe, e-mail: [email protected]
> To contact the owner, e-mail: [email protected]
> 
-- 
To unsubscribe, e-mail: [email protected]
To contact the owner, e-mail: [email protected]