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#!/bin/bash
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#!/bin/bash
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# $Id: alcasar-iptables-bypass.sh 2957 2021-05-26 13:06:56Z rexy $
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# $Id: alcasar-iptables-bypass.sh 3043 2022-07-22 17:10:23Z rexy $
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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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# applique les regles du parefeu en mode ByPass
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# Applique les regles du parefeu en mode ByPass
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# put the firewall rules in 'ByPass' mode
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# Set the firewall rules in 'ByPass' mode
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CONF_FILE="/usr/local/etc/alcasar.conf"
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CONF_FILE="/usr/local/etc/alcasar.conf"
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private_ip_mask=`grep ^PRIVATE_IP= $CONF_FILE|cut -d"=" -f2`
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private_ip_mask=`grep ^PRIVATE_IP= $CONF_FILE|cut -d"=" -f2`
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private_ip_mask=${private_ip_mask:=192.168.182.1/24}
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private_ip_mask=${private_ip_mask:=192.168.182.1/24}
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private_network=`/bin/ipcalc -n $private_ip_mask|cut -d"=" -f2`		# LAN IP address (ie.: 192.168.182.0)
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private_network=`/bin/ipcalc -n $private_ip_mask|cut -d"=" -f2`		# LAN IP address (ie.: 192.168.182.0)
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then
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then
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	PTN="\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\/([012]?[0-9]|3[0-2])\b"
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	PTN="\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\/([012]?[0-9]|3[0-2])\b"
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	public_ip_mask=`ip addr show $EXTIF | egrep -o $PTN`
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	public_ip_mask=`ip addr show $EXTIF | egrep -o $PTN`
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fi
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fi
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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_LAN=`grep ^SSH_LAN= $CONF_FILE|cut -d"=" -f2`			# SSH LAN port
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SSH=${SSH:=off}
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SSH_LAN=${SSH_LAN:=0}
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SSH_WAN=`grep ^SSH_WAN= $CONF_FILE|cut -d"=" -f2`		# SSH WAN port
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SSH_WAN=${SSH_WAN:=0}
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SSH_WAN_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2|cut -d"/" -f2`
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SSH_WAN_ADMIN_FROM=${SSH_WAN_ADMIN_FROM:="0.0.0.0"}
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SSH_WAN_ADMIN_FROM=$([ "$SSH_WAN_ADMIN_FROM" == "0.0.0.0" ] && echo "0.0.0.0/0" || echo "$SSH_WAN_ADMIN_FROM" )
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SSH_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`
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SSH_LAN_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2|cut -d"/" -f1`
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SSH_LAN_ADMIN_FROM=${SSH_LAN_ADMIN_FROM:="0.0.0.0"}
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SSH_ADMIN_FROM=${SSH_ADMIN_FROM:="0.0.0.0/0.0.0.0"}				# WAN IP address to reduce ssh access (all ip allowed on LAN side)
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SSH_LAN_ADMIN_FROM=$([ "$SSH_LAN_ADMIN_FROM" == "0.0.0.0" ] && echo "$PRIVATE_NETWORK_MASK" || echo "$SSH_LAN_ADMIN_FROM" )
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# On vide (flush) toutes les règles existantes
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# On vide (flush) toutes les règles existantes
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# Flush all existing rules
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# Flush all existing rules
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$IPTABLES -F
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$IPTABLES -F
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$IPTABLES -t nat -F
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$IPTABLES -t nat -F
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# On autorise tout sur loopback
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# On autorise tout sur loopback
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# accept all on loopback
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# accept all on loopback
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$IPTABLES -A OUTPUT -o lo -j ACCEPT
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$IPTABLES -A OUTPUT -o lo -j ACCEPT
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$IPTABLES -A INPUT -i lo -j ACCEPT
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$IPTABLES -A INPUT -i lo -j ACCEPT
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# Insertion de règles de blocage (Devel)
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#############################
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# Here, we add block rules (Devel)
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#         INPUT             #
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if [ -s /usr/local/etc/alcasar-ip-blocked ]; then
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	while read ip_line
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	do
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		ip_on=`echo $ip_line|cut -b1`
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#############################
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		if [ $ip_on != "#" ]
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		then
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			ip_blocked=`echo $ip_line|cut -d" " -f1`
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			$IPTABLES -A FORWARD -d $ip_blocked -j NFLOG --nflog-group 1 --nflog-prefix "RULE IP-blocked -- REJECT "
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			$IPTABLES -A FORWARD -d $ip_blocked -j REJECT
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		fi
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	done < /usr/local/etc/alcasar-ip-blocked
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fi
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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_LAN -gt 0 ]
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	then
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	$IPTABLES -A INPUT -i $INTIF -s $SSH_LAN_ADMIN_FROM -d $PRIVATE_IP -p tcp --dport $SSH_LAN -m conntrack --ctstate NEW -j NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-LAN -- ACCEPT"
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	$IPTABLES -A INPUT -i $INTIF -s $SSH_LAN_ADMIN_FROM -d $PRIVATE_IP -p tcp --dport $SSH_LAN -j ACCEPT
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fi
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if [ $SSH_WAN -gt 0 ]
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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 NFLOG --nflog-group 2 --nflog-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 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 NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-WAN -- ACCEPT"
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	$IPTABLES -A INPUT -i $EXTIF -s $SSH_WAN_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport $SSH_WAN -m conntrack --ctstate NEW --syn -j NFLOG --nflog-group 2 --nflog-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 -j ACCEPT
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	$IPTABLES -A INPUT -i $EXTIF -s $SSH_WAN_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport $SSH_WAN -j ACCEPT
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fi
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fi
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# Insertion de règles locales
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# Insertion de règles locales
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# Here, we add local rules (i.e. VPN from Internet)
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# Here, we add local rules (i.e. VPN from Internet)
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if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
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if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
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	. /usr/local/etc/alcasar-iptables-local.sh
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	. /usr/local/etc/alcasar-iptables-local.sh
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fi
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fi
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# On drop le broadcast et le multicast sur les interfaces (sans Log)
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# On drop le broadcast et le multicast sur les interfaces (sans Log)
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# Drop broadcast & multicast
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# Drop broadcast & multicast
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$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
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$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
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# On laisse passer les ICMP echo-request et echo-reply en provenance du LAN
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# On autorise l'accès aux services internes
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# Allow ping (icmp N°0 & 8) from LAN
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# Allow Internal access
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 0 -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 8 -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport domain -j ACCEPT	# DNS
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# On autorise les retours de connexions légitimes par FORWARD
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# Conntrack on forward
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$IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
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 - 
 
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# On autorise les demandes de connexions sortantes
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$IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j NFLOG --nflog-group 1 --nflog-prefix "RULE Transfert -- ACCEPT "
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
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$IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport https -j ACCEPT	# ACC
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# On autorise les flux entrant ntp et dns via INTIF
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$IPTABLES -A INPUT -i $INTIF -d $PRIVATE_IP -p udp --dport domain -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport http -j ACCEPT	# ACC
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$IPTABLES -A INPUT -i $INTIF -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT	# Serveur local de temps # local time server
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# On autorise le retour des connexions entrante déjà acceptées
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# On autorise le retour des connexions entrante déjà acceptées
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$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
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$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
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# On interdit et on log le reste sur les 2 interfaces d'accès
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# On interdit et on log le reste sur les 2 interfaces d'accès
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$IPTABLES -A INPUT -i $INTIF -j NFLOG --nflog-group 1 --nflog-prefix "RULE rej-int -- REJECT "
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$IPTABLES -A INPUT -i $INTIF -j NFLOG --nflog-group 1 --nflog-prefix "RULE rej-int -- REJECT "
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$IPTABLES -A INPUT -i $EXTIF -j NFLOG --nflog-group 1 --nflog-prefix "RULE rej-ext -- REJECT "
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$IPTABLES -A INPUT -i $EXTIF -j NFLOG --nflog-group 1 --nflog-prefix "RULE rej-ext -- REJECT "
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$IPTABLES -A INPUT -p tcp -j REJECT --reject-with tcp-reset
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$IPTABLES -A INPUT -p tcp -j REJECT --reject-with tcp-reset
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$IPTABLES -A INPUT -p udp -j REJECT --reject-with icmp-port-unreachable
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$IPTABLES -A INPUT -p udp -j REJECT --reject-with icmp-port-unreachable
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- 
 
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#############################
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#        FORWARD            #
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#############################
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# On autorise les retours de connexions légitimes par FORWARD
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# Conntrack on forward
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$IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
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# Insertion de règles de blocage
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# Here, we add block rules
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if [ -s /usr/local/etc/alcasar-ip-blocked ]; then
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	while read ip_line
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	do
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		ip_on=`echo $ip_line|cut -b1`
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		if [ $ip_on != "#" ]
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 128 
		then
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			ip_blocked=`echo $ip_line|cut -d" " -f1`
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			$IPTABLES -A FORWARD -d $ip_blocked -j NFLOG --nflog-group 1 --nflog-prefix "RULE IP-blocked -- REJECT "
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			$IPTABLES -A FORWARD -d $ip_blocked -j REJECT
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		fi
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	done < /usr/local/etc/alcasar-ip-blocked
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fi
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- 
 
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# On autorise les demandes de connexions sortantes
- 
 
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$IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j NFLOG --nflog-group 1 --nflog-prefix "RULE Transfert -- ACCEPT "
- 
 
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$IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j ACCEPT
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 139 
 
- 
 
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#############################
- 
 
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#       POSTROUTING         #
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#############################
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# On active le masquage d'adresse par translation (NAT)
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# On active le masquage d'adresse par translation (NAT)
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$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
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$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
126 
 
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# on ne sauvegarde pas les règles. En cas de reboot, on repasse ainsi automatiquement en mode normal (bypass -off)
 146 
# on ne sauvegarde pas les règles. En cas de reboot, on repasse ainsi automatiquement en mode normal (bypass -off)
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# Fin du script des regles du parefeu
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# Fin du script des regles du parefeu