427 lines
		
	
	
		
			16 KiB
		
	
	
	
		
			Bash
		
	
	
		
			Executable File
		
	
	
			
		
		
	
	
			427 lines
		
	
	
		
			16 KiB
		
	
	
	
		
			Bash
		
	
	
		
			Executable File
		
	
	
#!/bin/sh
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### BEGIN INIT INFO
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# Provides:          firewall
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# Required-Start:    $remote_fs $rsyslog
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# Required-Stop:     $remote_fs $rsyslog
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# Default-Start:     2 3 4 5
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# Default-Stop:      0 1 6
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# Short-Description: Firewall initscript
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# Description:       Firewall script for iptables
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#   To test the script you can just use 'test' arg:
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# ./firewall test
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# service firewall test
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# Doc: * http://openvz.org/Using_NAT_for_container_with_private_IPs
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#      * ...
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### END INIT INFO
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# Author: Gardouille
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# **********************************************************************************************
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#
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# Global var
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#
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# -----------------------------------------------------------
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# iptables path
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IPT="/sbin/iptables"
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# testing for XX seconds
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TIME=42
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#### Colors definition
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export REDB='\033[1;31m'
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export GREEN='\033[1;32m'
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export WHITEB='\033[1;37m'
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export RESET='\033[0m'
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fw_init() {
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  #############
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  ## KERNEL  ##
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  #############
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  # Enable Cookie TCP SYN protection
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  echo 1 > /proc/sys/net/ipv4/tcp_syncookies
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  # Enable IP spoofing protection
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  # Check the ip source
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  for SYS in /proc/sys/net/ipv4/conf/*/rp_filter
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  do
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  echo 1 > ${SYS}
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  done
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  # Disable ICMP redirect
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  for SYS in /proc/sys/net/ipv4/conf/*/accept_redirects
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  do
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  echo 0 > ${SYS}
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  done
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  # Disable source-route packages
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  for SYS in /proc/sys/net/ipv4/conf/*/accept_source_route
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  do
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  echo 0 > ${SYS}
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  done
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  # Enable ip forwarding
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  #echo 1 > /proc/sys/net/ipv4/ip_forward
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  #############
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  ## POLICY  ##
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  #############
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  # drop all traffic
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  $IPT -P INPUT DROP
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  $IPT -P FORWARD DROP
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  $IPT -P OUTPUT DROP
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  #$IPT -P INPUT ACCEPT
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  #$IPT -P FORWARD ACCEPT
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  #$IPT -P OUTPUT ACCEPT
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  ############
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  ##  BASE  ##
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  ############
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  # Drop all new connections without a syn flag
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  $IPT -t filter -A INPUT -j DROP -p tcp ! --syn -m state --state NEW
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  # Forbid local connections that doesn't come from localhost
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  $IPT -A INPUT -j REJECT ! -i lo -d 127.0.0.1/8 -m comment --comment "Reject lo not from lo"
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  # Allow loopback
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  $IPT -A INPUT -j ACCEPT -i lo -m comment --comment "Loopback in"
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  $IPT -A OUTPUT -j ACCEPT -o lo -m comment --comment "Loopback out"
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  ##############
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  ##  OUTPUT  ##
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  ##############
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  #### ICMP request (Ping)
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  $IPT -A OUTPUT -j ACCEPT -p icmp -m state --state NEW -m comment --comment "ICMP out"
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}
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fw_start() {
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  #############
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  ##  INPUT  ##
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  #############
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  #### Pour tenter de s'y retrouver avec l'affichage des règles iptables, pour l'écriture des règles,
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  #   respecter cet ordre:
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  # -t TABLE -A CHAINE -j TARGET -p PROTOCOLE -i ETH_IN -o ETH_OUT -s SOURCE -d DESTINATION --sport PORT_SRC --dport PORT_DST -m state --state LIST_OF_STATE -m comment --comment "tiny DESCRIPTION"
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  ####
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  #### Ne pas casser les connexions etablies
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  $IPT -A INPUT -j ACCEPT -p all -i "${ILAN}" -d "${IPLAN}" -m state --state RELATED,ESTABLISHED
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#  $IPT -A FORWARD -j ACCEPT -p all -o "${IVM}" -d "${LANVM}" -m state --state RELATED,ESTABLISHED
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  #####
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#  $IPT -A INPUT -j ACCEPT -s 192.168.42.166 -d 192.168.42.1 -m comment --comment "TEST Rules"
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#  $IPT -A OUTPUT -j ACCEPT -s 192.168.42.1 -d 192.168.42.166 -m comment --comment "TEST Rules"
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#
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#  $IPT -A INPUT -j ACCEPT -p icmp -s ${LANVM} -d "${IPLAN}" -m comment --comment "ICMP req LANVM"
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  #### ICMP (Ping)
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  # Accept all ping
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  #$IPT -A INPUT -p icmp -j ACCEPT
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  # Accept icmp ping from LAN
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  #$IPT -A INPUT -j ACCEPT -p icmp -i "${ILAN}" -s ${LAN} -d "${IPLAN}" -m comment --comment "ICMP req LAN"
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  if [ $(command -v sshd) ]; then
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    #### SSHD
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    $IPT -A INPUT -j ACCEPT -p tcp -i "${ILAN}" -d "${IPLAN}" --dport 22 -m state --state NEW -m comment --comment "New SSH in"
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  fi
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  ## BackupPC
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  $IPT -A INPUT -j ACCEPT -p icmp -i "${ILAN}" -s 192.168.0.3 -d "${IPLAN}" -m comment --comment "ICMP FURY req"
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  $IPT -A INPUT -j ACCEPT -p tcp -i "${ILAN}" -s 192.168.0.3 -d "${IPLAN}" --dport 22 -m state --state NEW -m comment --comment "New SSH fury in"
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  if [ $(command -v apache2) ] || [ $(command -v nginx) ]; then
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    #### Web server
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    $IPT -A INPUT -j ACCEPT -p tcp -i "${ILAN}" -d "${IPLAN}" --dport 80 -m state --state NEW -m comment --comment "New HTTP in"
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    $IPT -A INPUT -j ACCEPT -p tcp -i "${ILAN}" -d "${IPLAN}" --dport 443 -m state --state NEW -m comment --comment "New HTTPS in"
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  fi
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  if [ $(command -v slapd) ]; then
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    #### slapd
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    #### if 389 is use, ldap connections should be in TLS
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    $IPT -A INPUT -j ACCEPT -p tcp -i "${ILAN}" -d "${IPLAN}" --dport 389 -m state --state NEW -m comment --comment "New LDAP in"
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    $IPT -A INPUT -j ACCEPT -p tcp -i "${ILAN}" -d "${IPLAN}" --dport 636 -m state --state NEW -m comment --comment "New LDAPS in"
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  fi
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  if [ $(command -v dhcpd) ]; then
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    #### dhcpd
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    $IPT -A INPUT -j ACCEPT -p udp -i "${ILAN}" -d "${IPLAN}" --sport 67:68 --dport 67:68 -m state --state NEW -m comment --comment "New DHCPD in"
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  fi
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  if [ -f /etc/init.d/puppetmaster ] || [ -f /etc/systemd/system/puppetmaster.service ]; then
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    #### PuppetMaster
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    $IPT -A INPUT -j ACCEPT -p tcp -i "${ILAN}" -s "${LAN}" -d "${IPLAN}" --dport 8140 -m state --state NEW -m comment --comment "New Puppet in"
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  fi
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  if [ $(command -v nfsdcltrack) ]; then
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    #### NFS Server
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    $IPT -A INPUT -j ACCEPT -p tcp -i "${ILAN}" -d "${IPLAN}" --dport 111 -m state --state NEW -m comment --comment "NFS in"
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    $IPT -A INPUT -j ACCEPT -p udp -i "${ILAN}" -d "${IPLAN}" --dport 111 -m state --state NEW -m comment --comment "NFS in"
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    $IPT -A INPUT -j ACCEPT -p tcp -i "${ILAN}" -d "${IPLAN}" --dport 2049 -m state --state NEW -m comment --comment "NFS "
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    $IPT -A INPUT -j ACCEPT -p udp -i "${ILAN}" -d "${IPLAN}" --dport 2049 -m state --state NEW -m comment --comment "NFS in"
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    # 32769: rpc.quotad
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    # For more informations see: https://wiki.debian.org/SecuringNFS
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    $IPT -A INPUT -j ACCEPT -p tcp -i "${ILAN}" -d "${IPLAN}" --dport 32769 -m state --state NEW -m comment --comment "NFS quotad in"
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    $IPT -A INPUT -j ACCEPT -p udp -i "${ILAN}" -d "${IPLAN}" --dport 32769 -m state --state NEW -m comment --comment "NFS quotad in"
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  fi
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  #### tftp allowed
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  #$IPT -A INPUT -j ACCEPT -p udp -i "${ILAN}" -d "${IPLAN}" --dport 69 -m state --state NEW -m comment --comment "TFTPD in"
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  if [ $(command -v cupsd) ]; then
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    #### Printers
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    $IPT -A INPUT -j ACCEPT -p udp -i "${ILAN}" -d "${IPLAN}" --sport 161 -m state --state NEW -m comment --comment "SNMP IN"
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  fi
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  #########################
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  ##  {Multi,Broad}cast  ##
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  #########################
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  #### DROP Multicast & broadcast
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  $IPT -t mangle -A PREROUTING -j DROP -p udp -i "${ILAN}" -d 255.255.255.255 -m comment --comment "DROP Broadcast1"
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  $IPT -t mangle -A PREROUTING -j DROP -p udp -i "${ILAN}" -d 129.20.27.255 -m comment --comment "DROP Broadcast2"
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  $IPT -t mangle -A PREROUTING -j DROP -p udp -i "${ILAN}" -d 129.20.255.255 -m comment --comment "DROP Broadcast3"
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  $IPT -t mangle -A PREROUTING -j DROP -p udp -i "${ILAN}" -d 224.0.0.1 -m comment --comment "DROP Multicast1"
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  $IPT -t mangle -A PREROUTING -j DROP -p udp -i "${ILAN}" -d 224.0.0.251 -m comment --comment "DROP Multicast2"
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  ##############
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  ##  OUTPUT  ##
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  ##############
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  #### Ne pas casser les connexions etablies
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  $IPT -A OUTPUT -j ACCEPT -p all -o "${ILAN}" -s "${IPLAN}" -m state --state RELATED,ESTABLISHED,UNTRACKED
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#
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#  #### ICMP reply (Ping)
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#  #$IPT -A OUTPUT -j ACCEPT -p icmp -o "${ILAN}" --icmp-type 0 -s "${IPLAN}" -d 0/0 -m state --state ESTABLISHED,RELATED -m comment --comment "ICMP reply"
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  if [ $(command -v ssh) ]; then
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    #### SSH
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    $IPT -A OUTPUT -j ACCEPT -p tcp -o "${ILAN}" --dport 22 -m state --state NEW -m comment --comment "SSH out"
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  fi
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  #### Mail SMTP
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  ## Port 465 (SMTPS SSL) is deprecated)
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  $IPT -A OUTPUT -j ACCEPT -p tcp -o "${ILAN}" --dport 25 -m state --state NEW -m comment --comment "SMTP out"
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  $IPT -A OUTPUT -j ACCEPT -p tcp -o "${ILAN}" --dport 587 -m state --state NEW -m comment --comment "SMTP TLS out"
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  #### Mail IMPA
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  $IPT -A OUTPUT -j ACCEPT -p tcp -o "${ILAN}" --dport 143 -m state --state NEW -m comment --comment "IMAP out"
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  $IPT -A OUTPUT -j ACCEPT -p tcp -o "${ILAN}" --dport 993 -m state --state NEW -m comment --comment "IMAPS out"
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  #### DNS (résolution de noms de domaines, ... ...)
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  $IPT -A OUTPUT -j ACCEPT -p udp -o ${ILAN} --dport 53 -m state --state NEW -m comment --comment "DNS out udp"
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  $IPT -A OUTPUT -j ACCEPT -p tcp -o ${ILAN} --dport 53 -m state --state NEW -m comment --comment "DNS out tcp"
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  if [ $(command -v dhclient) ]; then
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    #### DHCP
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    $IPT -A OUTPUT -j ACCEPT -p udp -o ${ILAN} -s "${IPLAN}" --sport 68 -m comment --comment "DHCPREQUEST"
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  fi
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  #### HTTP (maj, ...)
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  $IPT -A OUTPUT -j ACCEPT -p tcp -o ${ILAN} --dport 80 -m state --state NEW -m comment --comment "HTTP out"
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  $IPT -A OUTPUT -j ACCEPT -p tcp -o ${ILAN} --dport 443 -m state --state NEW -m comment --comment "HTTPS out"
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  if [ $(command -v ntpd) ]; then
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    #### NTP
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    $IPT -A OUTPUT -j ACCEPT -p udp -o ${ILAN} --dport 123 -m state --state NEW -m comment --comment "NTP out"
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  fi
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  if [ $(command -v puppet) ]; then
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    #### Puppet (connection, ... )
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    $IPT -A OUTPUT -j ACCEPT -p tcp -o "${ILAN}" --dport 8140 -m state --state NEW -m comment --comment "Puppet out"
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  fi
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  #### OpenPGP HTTP key server (add key, maj, ...)
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  $IPT -A OUTPUT -j ACCEPT -p tcp -o ${ILAN} --dport 11371 -m state --state NEW -m comment --comment "OpenPGP req"
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  if [ $(command -v apache2) ] || [ $(command -v nginx) ]; then
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    #### Web server
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    $IPT -A OUTPUT -j ACCEPT -p tcp -o ${ILAN} --sport 80 -m state --state NEW -m comment --comment "New HTTPD out"
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    $IPT -A OUTPUT -j ACCEPT -p tcp -o ${ILAN} --sport 443 -m state --state NEW -m comment --comment "New HTTPDs out"
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  fi
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  if [ -d /etc/ldap ]; then
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    #### ldap connection should be in TLS or at least in LDAPS/SSL
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    $IPT -A OUTPUT -j ACCEPT -p tcp -o "${ILAN}" -s "${IPLAN}" --dport 389 -m state --state NEW -m comment --comment "LDAP out"
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    $IPT -A OUTPUT -j ACCEPT -p tcp -o "${ILAN}" -s "${IPLAN}" --dport 636 -m state --state NEW -m comment --comment "LDAPS out"
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  fi
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  if [ $(command -v dhcpd) ]; then
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    #### dhcpd
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    $IPT -A OUTPUT -j ACCEPT -p udp -o "${ILAN}" -s "${IPLAN}" --sport 67:68 --dport 67:68 -m state --state NEW -m comment --comment "DHCPD out"
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  fi
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  if [ $(command -v nfsiostat) ]; then
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    #### NFS Client
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    $IPT -A OUTPUT -j ACCEPT -p tcp -o "${ILAN}" -s "${IPLAN}" --dport 111 -m state --state NEW -m comment --comment "NFS out"
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    $IPT -A OUTPUT -j ACCEPT -p udp -o "${ILAN}" -s "${IPLAN}" --dport 111 -m state --state NEW -m comment --comment "NFS out"
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    $IPT -A OUTPUT -j ACCEPT -p tcp -o "${ILAN}" -s "${IPLAN}" --dport 2049 -m state --state NEW -m comment --comment "NFS out"
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    $IPT -A OUTPUT -j ACCEPT -p udp -o "${ILAN}" -s "${IPLAN}" --dport 2049 -m state --state NEW -m comment --comment "NFS out"
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    # List of ports to use given by NFS server
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    # For more informations see: https://wiki.debian.org/SecuringNFS
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    $IPT -A OUTPUT -j ACCEPT -p tcp -o "${ILAN}" -s "${IPLAN}" --dport 32767 -m state --state NEW -m comment --comment "NFS mountd out"
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    $IPT -A OUTPUT -j ACCEPT -p udp -o "${ILAN}" -s "${IPLAN}" --dport 32767 -m state --state NEW -m comment --comment "NFS mountd out"
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  fi
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  if [ $(command -v cupsd) ]; then
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    #### Printers
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    $IPT -A OUTPUT -j ACCEPT -p udp -o "${ILAN}" -s "${IPLAN}" --dport 161 -m state --state NEW -m comment --comment "SNMP OUT"
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    #### HP Printers
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    $IPT -A OUTPUT -j ACCEPT -p tcp -o "${ILAN}" -s "${IPLAN}" --dport 9100 -m state --state NEW -m comment --comment "HP printer OUT"
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  fi
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}
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# Règles pour de log
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fw_log() {
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  #############
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  ##   LOG   ##
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  #############
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  # LOG INPUT DROP PAQUET
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  $IPT -N INPLOG
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  $IPT -A INPUT -j INPLOG
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  $IPT -A INPLOG -p tcp -m limit --limit 5/min --limit-burst 10 -j LOG --log-prefix "Drop-IN [tcp]: "
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  $IPT -A INPLOG -p udp -m limit --limit 5/min --limit-burst 10 -j LOG --log-prefix "Drop-IN [udp]: "
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  $IPT -A INPLOG -p icmp -m limit --limit 5/min --limit-burst 10 -j LOG --log-prefix "Drop-IN [icmp]: "
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  # LOG OUTPUT DROP PAQUET
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  $IPT -N OUTLOG
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  $IPT -A OUTPUT -j OUTLOG
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  $IPT -A OUTLOG -p tcp -m limit --limit 5/min --limit-burst 10 -j LOG --log-prefix "Drop-OUT [tcp]: "
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  $IPT -A OUTLOG -p udp -m limit --limit 5/min --limit-burst 10 -j LOG --log-prefix "Drop-OUT [udp]: "
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  $IPT -A OUTLOG -p icmp -m limit --limit 5/min --limit-burst 10 -j LOG --log-prefix "Drop-OUT [icmp]: "
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  # LOG FORWARD DROP PAQUET
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  $IPT -N FORLOG
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  $IPT -A FORWARD -j FORLOG
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  $IPT -A FORLOG -p tcp -m limit --limit 5/min --limit-burst 10 -j LOG --log-prefix "Drop-FOR [tcp]: "
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  $IPT -A FORLOG -p udp -m limit --limit 5/min --limit-burst 10 -j LOG --log-prefix "Drop-FOR [udp]: "
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  $IPT -A FORLOG -p icmp -m limit --limit 5/min --limit-burst 10 -j LOG --log-prefix "Drop-FOR [icmp]: "
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}
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# Arrêt du firewall
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fw_stop() {
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  # Supprimer une route ajouter automatiquement
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  #ip route del 169.254.0.0/16
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  # Vider les tables actuelles
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  $IPT -t filter -F
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  # Vider les règles personnelles
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  $IPT -t filter -X
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  $IPT -t nat -F
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  $IPT -t nat -X
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  $IPT -t mangle -F
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  $IPT -t mangle -X
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  $IPT -P INPUT ACCEPT
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  $IPT -P FORWARD ACCEPT
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  $IPT -P OUTPUT ACCEPT
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  $IPT -t nat -P PREROUTING ACCEPT
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  $IPT -t nat -P OUTPUT ACCEPT
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  $IPT -t nat -P POSTROUTING ACCEPT
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  $IPT -t mangle -P PREROUTING ACCEPT
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  $IPT -t mangle -P INPUT ACCEPT
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  $IPT -t mangle -P FORWARD ACCEPT
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  $IPT -t mangle -P OUTPUT ACCEPT
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  $IPT -t mangle -P POSTROUTING ACCEPT
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}
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# VPN
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fw_vpn() {
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						|
  # Allow all traffic throught VPN
 | 
						|
  $IPT -I INPUT -j ACCEPT -p all -i "${ILAN}" -m state --state NEW,RELATED,ESTABLISHED -m comment --comment "VPN in"
 | 
						|
  $IPT -I OUTPUT -j ACCEPT -p all -o "${ILAN}" -m state --state NEW,RELATED,ESTABLISHED,UNTRACKED -m comment --comment "VPN out"
 | 
						|
}
 | 
						|
 | 
						|
# **********************************************************************************************
 | 
						|
#
 | 
						|
# Programme principale
 | 
						|
#
 | 
						|
# -----------------------------------------------------------
 | 
						|
 | 
						|
case "${1}" in
 | 
						|
  start|restart)
 | 
						|
    printf '%s\n' "Start firewall …"
 | 
						|
    fw_stop
 | 
						|
    fw_init
 | 
						|
    # List all available interface except localhost
 | 
						|
    for PATH_ILAN in $(find /sys/class/net/ ! \( -name lo -o -iname "tun*" \) -type l); do
 | 
						|
      # Interface name
 | 
						|
      ILAN=$(basename ${PATH_ILAN})
 | 
						|
      IS_UP=$(grep 1 ${PATH_ILAN}/carrier)
 | 
						|
 | 
						|
      # Test if interface is connected
 | 
						|
      if [ ${IS_UP} ]; then
 | 
						|
        # Interface IP
 | 
						|
        IPLAN=$(ip route|grep -v "default"|grep ${ILAN}|grep src|awk '{print $NF}')
 | 
						|
        # IP/MASK
 | 
						|
        #IPLAN=$(ip a s "${ILAN}"|grep "inet "|awk '{print $2}')
 | 
						|
        # Interface LAN
 | 
						|
        LAN=$(ip route|grep -v "default"|grep "${IPLAN}"|awk '{print $1}')
 | 
						|
 | 
						|
        printf '%b' "${WHITEB}${ILAN} ${GREEN}connected${RESET}: \t${IPLAN} \ton ${LAN}\n"
 | 
						|
 | 
						|
        # Load rules for this interface
 | 
						|
        fw_start
 | 
						|
      else
 | 
						|
        printf '%b' "${WHITEB}${ILAN} ${REDB}disconnected${RESET}\n"
 | 
						|
      fi
 | 
						|
    done
 | 
						|
 | 
						|
    # If exist, load local rules file
 | 
						|
    if [ -f "${0}.local" ]; then
 | 
						|
      printf '%b' "Load local rules file\n"
 | 
						|
      ${0}.local
 | 
						|
    fi
 | 
						|
 | 
						|
    fw_log
 | 
						|
    ;;
 | 
						|
  stop)
 | 
						|
    printf '%s\n' "Clean all firewall rules"
 | 
						|
    fw_stop
 | 
						|
    ;;
 | 
						|
  test)
 | 
						|
    printf '%b' "Load firewall rules for ${TIME} secondes …\n"
 | 
						|
 | 
						|
    $0 start
 | 
						|
    sleep ${TIME}
 | 
						|
    fw_stop
 | 
						|
    ;;
 | 
						|
  vpn)
 | 
						|
    printf '%s\n' "Special rules for VPN interfaces (TUN or TAP)"
 | 
						|
    for PATH_ILAN in $(find /sys/class/net/ \( -iname "*tun*" -o -iname "*tap*" \) -type l ); do
 | 
						|
      ILAN=$(basename ${PATH_ILAN})
 | 
						|
      IS_UP=$(grep 1 ${PATH_ILAN}/carrier)
 | 
						|
 | 
						|
      if [ ${IS_UP} ]; then
 | 
						|
        # IP
 | 
						|
        IPLAN=$(ip route|grep -v "default"|grep ${ILAN}|grep src|awk '{print $NF}')
 | 
						|
        # IP/MASK
 | 
						|
        #IPLAN=$(ip a s "${ILAN}"|grep "inet "|awk '{print $2}')
 | 
						|
        LAN=$(ip route|grep -v "default"|grep "${IPLAN}"|awk '{print $1}')
 | 
						|
 | 
						|
        printf '%b' "${WHITEB}${ILAN} ${GREEN}connected${RESET}: \t${IPLAN} \ton ${LAN}\n"
 | 
						|
 | 
						|
        # Load special rules for this interface
 | 
						|
        fw_vpn
 | 
						|
      else
 | 
						|
        printf '%b' "${WHITEB}${ILAN} ${REDB}disconnected${RESET}\n"
 | 
						|
      fi
 | 
						|
    done
 | 
						|
    ;;
 | 
						|
  *)
 | 
						|
    echo "Usage: firewall ({start|stop|restart|test})"
 | 
						|
    exit 1
 | 
						|
    ;;
 | 
						|
esac
 | 
						|
 | 
						|
# Fin du script
 | 
						|
exit 0
 | 
						|
 | 
						|
# Fin de la boucle principale
 | 
						|
# -----------------------------------------------------------
 |