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#!/bin/bash
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#!/bin/bash
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# $Id: alcasar-iptables-bypass.sh 1062 2013-04-01 21:20:12Z richard $
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# $Id: alcasar-iptables-bypass.sh 1063 2013-04-01 21:36:46Z richard $
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# alcasar-iptables-bypass.sh
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# alcasar-iptables-bypass.sh
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# by Rexy - 3abtux
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# by Rexy - 3abtux
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# This script is distributed under the Gnu General Public License (GPL)
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# This script is distributed under the Gnu General Public License (GPL)
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PRIVATE_IP=`echo $private_ip_mask | cut -d"/" -f1` # ALCASAR LAN IP address
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PRIVATE_IP=`echo $private_ip_mask | cut -d"/" -f1` # ALCASAR LAN IP address
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public_ip_mask=`grep PUBLIC_IP= $conf_file|cut -d"=" -f2` # ALCASAR WAN IP address
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public_ip_mask=`grep PUBLIC_IP= $conf_file|cut -d"=" -f2` # ALCASAR WAN IP address
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PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
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PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
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SSH=`grep SSH= $conf_file|cut -d"=" -f2` # sshd active (on/off)
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SSH=`grep SSH= $conf_file|cut -d"=" -f2` # sshd active (on/off)
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SSH=${SSH:=off}
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SSH=${SSH:=off}
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SSH_ADMIN_IP=`grep SSH_ADMIN_IP= $conf_file|cut -d"=" -f2`
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SSH_ADMIN_FROM=`grep SSH_ADMIN_FROM= $conf_file|cut -d"=" -f2`
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SSH_ADMIN_IP=${SSH_ADMIN_IP:="0.0.0.0/0.0.0.0"} # WAN IP address to reduce ssh access (all ip allowed on LAN side)
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SSH_ADMIN_FROM=${SSH_ADMIN_FROM:="0.0.0.0/0.0.0.0"} # WAN IP address to reduce ssh access (all ip allowed on LAN side)
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# On vide (flush) toutes les règles existantes
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# On vide (flush) toutes les règles existantes
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# Flush all existing rules
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# Flush all existing rules
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$IPTABLES -F
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$IPTABLES -F
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# SSHD rules if activate
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# SSHD rules if activate
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if [ $SSH = on ]
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if [ $SSH = on ]
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then
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then
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-LAN -- ACCEPT"
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-LAN -- ACCEPT"
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
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$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_IP -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW --syn -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-WAN -- ACCEPT"
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$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW --syn -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-WAN -- ACCEPT"
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$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_IP -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW,ESTABLISHED -j ACCEPT
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$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW,ESTABLISHED -j ACCEPT
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$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport ssh -m state --state ESTABLISHED -j ACCEPT
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$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport ssh -m state --state ESTABLISHED -j ACCEPT
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fi
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fi
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# Insertion de règles locales
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# Insertion de règles locales
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# Here, we add local rules (i.e. VPN from Internet)
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# Here, we add local rules (i.e. VPN from Internet)
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