minifirewall script has been renamed to minifirewall-{start,stop}.sh
This commit is contained in:
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minifirewall
492
minifirewall
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#!/bin/sh
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# minifirewall is shellscripts for easy firewalling on a standalone server
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# we used netfilter/iptables http://netfilter.org/ designed for recent Linux kernel
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# See https://gitea.evolix.org/evolix/minifirewall
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# Copyright (c) 2007-2015 Evolix
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 3
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# of the License.
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# Description
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# script for standalone server
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# Start or stop minifirewall
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#
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### BEGIN INIT INFO
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# Provides: minfirewall
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# Required-Start:
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# Required-Stop:
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# Should-Start: $network $syslog $named
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# Should-Stop: $syslog
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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: start and stop the firewall
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# Description: Firewall designed for standalone server
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### END INIT INFO
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DESC="minifirewall"
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NAME="minifirewall"
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# Variables configuration
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#########################
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# iptables paths
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IPT=/sbin/iptables
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IPT6=/sbin/ip6tables
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# TCP/IP variables
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LOOPBACK='127.0.0.0/8'
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CLASSA='10.0.0.0/8'
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CLASSB='172.16.0.0/12'
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CLASSC='192.168.0.0/16'
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CLASSD='224.0.0.0/4'
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CLASSE='240.0.0.0/5'
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ALL='0.0.0.0'
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BROAD='255.255.255.255'
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PORTSROOT='0:1023'
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PORTSUSER='1024:65535'
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chain_exists()
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{
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local chain_name="$1" ; shift
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[ $# -eq 1 ] && local intable="--table $1"
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iptables $intable -nL "$chain_name" >/dev/null 2>&1
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}
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# Configuration
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oldconfigfile="/etc/firewall.rc"
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configfile="/etc/default/minifirewall"
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IPV6=$(grep "IPV6=" /etc/default/minifirewall | awk -F '=' -F "'" '{print $2}')
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DOCKER=$(grep "DOCKER=" /etc/default/minifirewall | awk -F '=' -F "'" '{print $2}')
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INT=$(grep "INT=" /etc/default/minifirewall | awk -F '=' -F "'" '{print $2}')
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case "$1" in
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start)
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echo "Start IPTables rules..."
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# Stop and warn if error!
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set -e
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trap 'echo "ERROR in minifirewall configuration (fix it now!) or script manipulation (fix yourself)." ' INT TERM EXIT
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# sysctl network security settings
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##################################
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# Don't answer to broadcast pings
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echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
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# Ignore bogus ICMP responses
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echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
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# Disable Source Routing
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for i in /proc/sys/net/ipv4/conf/*/accept_source_route; do
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echo 0 > $i
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done
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# Enable TCP SYN cookies to avoid TCP-SYN-FLOOD attacks
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# cf http://cr.yp.to/syncookies.html
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echo 1 > /proc/sys/net/ipv4/tcp_syncookies
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# Disable ICMP redirects
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for i in /proc/sys/net/ipv4/conf/*/accept_redirects; do
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echo 0 > $i
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done
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for i in /proc/sys/net/ipv4/conf/*/send_redirects; do
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echo 0 > $i
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done
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# Enable Reverse Path filtering : verify if responses use same network interface
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for i in /proc/sys/net/ipv4/conf/*/rp_filter; do
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echo 1 > $i
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done
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# log des paquets avec adresse incoherente
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for i in /proc/sys/net/ipv4/conf/*/log_martians; do
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echo 1 > $i
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done
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# IPTables configuration
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########################
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$IPT -N LOG_DROP
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$IPT -A LOG_DROP -j LOG --log-prefix '[IPTABLES DROP] : '
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$IPT -A LOG_DROP -j DROP
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$IPT -N LOG_ACCEPT
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$IPT -A LOG_ACCEPT -j LOG --log-prefix '[IPTABLES ACCEPT] : '
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$IPT -A LOG_ACCEPT -j ACCEPT
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if test -f $oldconfigfile; then
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echo "$oldconfigfile is deprecated, rename to $configfile" >&2
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exit 1
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fi
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if ! test -f $configfile; then
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echo "$configfile does not exist" >&2
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exit 1
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fi
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tmpfile=`mktemp`
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. $configfile 2>$tmpfile >&2
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if [ -s $tmpfile ]; then
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echo "$configfile returns standard or error output (see below). Stopping." >&2
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cat $tmpfile
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exit 1
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fi
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rm $tmpfile
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# Trusted ip addresses
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$IPT -N ONLYTRUSTED
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$IPT -A ONLYTRUSTED -j LOG_DROP
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for x in $TRUSTEDIPS
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do
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$IPT -I ONLYTRUSTED -s $x -j ACCEPT
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done
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# Privilegied ip addresses
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# (trusted ip addresses *are* privilegied)
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$IPT -N ONLYPRIVILEGIED
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$IPT -A ONLYPRIVILEGIED -j ONLYTRUSTED
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for x in $PRIVILEGIEDIPS
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do
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$IPT -I ONLYPRIVILEGIED -s $x -j ACCEPT
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done
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# Chain for restrictions (blacklist IPs/ranges)
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$IPT -N NEEDRESTRICT
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# We allow all on loopback interface
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$IPT -A INPUT -i lo -j ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -A INPUT -i lo -j ACCEPT
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# if OUTPUTDROP
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$IPT -A OUTPUT -o lo -j ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -o lo -j ACCEPT
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# We avoid "martians" packets, typical when W32/Blaster virus
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# attacked windowsupdate.com and DNS was changed to 127.0.0.1
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# $IPT -t NAT -I PREROUTING -s $LOOPBACK -i ! lo -j DROP
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$IPT -A INPUT -s $LOOPBACK ! -i lo -j DROP
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if [ "$DOCKER" = "on" ]; then
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$IPT -N MINIFW-DOCKER-TRUSTED
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$IPT -A MINIFW-DOCKER-TRUSTED -j DROP
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$IPT -N MINIFW-DOCKER-PRIVILEGED
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$IPT -A MINIFW-DOCKER-PRIVILEGED -j MINIFW-DOCKER-TRUSTED
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$IPT -A MINIFW-DOCKER-PRIVILEGED -j RETURN
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$IPT -N MINIFW-DOCKER-PUB
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$IPT -A MINIFW-DOCKER-PUB -j MINIFW-DOCKER-PRIVILEGED
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$IPT -A MINIFW-DOCKER-PUB -j RETURN
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# Flush DOCKER-USER if exist, create it if absent
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if chain_exists 'DOCKER-USER'; then
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$IPT -F DOCKER-USER
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else
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$IPT -N DOCKER-USER
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fi;
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# Pipe new connection through MINIFW-DOCKER-PUB
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$IPT -A DOCKER-USER -i $INT -m state --state NEW -j MINIFW-DOCKER-PUB
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$IPT -A DOCKER-USER -j RETURN
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fi
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# Local services restrictions
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#############################
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# Allow services for $INTLAN (local server or local network)
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$IPT -A INPUT -s $INTLAN -j ACCEPT
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# Enable protection chain for sensible services
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for x in $SERVICESTCP1p
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do
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$IPT -A INPUT -p tcp --dport $x -j NEEDRESTRICT
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done
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for x in $SERVICESUDP1p
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do
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$IPT -A INPUT -p udp --dport $x -j NEEDRESTRICT
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done
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# Public service
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for x in $SERVICESTCP1
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do
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$IPT -A INPUT -p tcp --dport $x -j ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -A INPUT -p tcp --dport $x -j ACCEPT
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done
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for x in $SERVICESUDP1
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do
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$IPT -A INPUT -p udp --dport $x -j ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -A INPUT -p udp --dport $x -j ACCEPT
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done
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# Privilegied services
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for x in $SERVICESTCP2
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do
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$IPT -A INPUT -p tcp --dport $x -j ONLYPRIVILEGIED
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done
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for x in $SERVICESUDP2
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do
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$IPT -A INPUT -p udp --dport $x -j ONLYPRIVILEGIED
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done
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# Private services
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for x in $SERVICESTCP3
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do
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$IPT -A INPUT -p tcp --dport $x -j ONLYTRUSTED
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done
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for x in $SERVICESUDP3
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do
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$IPT -A INPUT -p udp --dport $x -j ONLYTRUSTED
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done
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if [ "$DOCKER" = "on" ]; then
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# Public services defined in SERVICESTCP1 & SERVICESUDP1
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for dstport in $SERVICESTCP1
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do
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$IPT -I MINIFW-DOCKER-PUB -p tcp --dport "$dstport" -j RETURN
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done
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for dstport in $SERVICESUDP1
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do
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$IPT -I MINIFW-DOCKER-PUB -p udp --dport "$dstport" -j RETURN
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done
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# Privileged services (accessible from privileged & trusted IPs)
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for dstport in $SERVICESTCP2
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do
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for srcip in $PRIVILEGIEDIPS
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do
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$IPT -I MINIFW-DOCKER-PRIVILEGED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
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done
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for srcip in $TRUSTEDIPS
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do
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$IPT -I MINIFW-DOCKER-PRIVILEGED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
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done
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done
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for dstport in $SERVICESUDP2
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do
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for srcip in $PRIVILEGIEDIPS
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do
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$IPT -I MINIFW-DOCKER-PRIVILEGED -p udp -s "$srcip" --dport "$dstport" -j RETURN
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done
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for srcip in $TRUSTEDIPS
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do
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$IPT -I MINIFW-DOCKER-PRIVILEGED -p udp -s "$srcip" --dport "$dstport" -j RETURN
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done
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done
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# Trusted services (accessible from trusted IPs)
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for dstport in $SERVICESTCP3
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do
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for srcip in $TRUSTEDIPS
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do
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$IPT -I MINIFW-DOCKER-TRUSTED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
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done
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done
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for dstport in $SERVICESUDP3
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do
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for srcip in $TRUSTEDIPS
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do
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$IPT -I MINIFW-DOCKER-TRUSTED -p udp -s "$srcip" --dport "$dstport" -j RETURN
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done
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done
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fi
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# External services
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###################
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# DNS authorizations
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for x in $DNSSERVEURS
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do
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$IPT -A INPUT -p tcp ! --syn --sport 53 --dport $PORTSUSER -s $x -j ACCEPT
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$IPT -A INPUT -p udp --sport 53 --dport $PORTSUSER -s $x -m state --state ESTABLISHED,RELATED -j ACCEPT
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$IPT -A OUTPUT -o $INT -p udp -d $x --dport 53 --match state --state NEW -j ACCEPT
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done
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# HTTP (TCP/80) authorizations
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for x in $HTTPSITES
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do
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$IPT -A INPUT -p tcp ! --syn --sport 80 --dport $PORTSUSER -s $x -j ACCEPT
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done
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# HTTPS (TCP/443) authorizations
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for x in $HTTPSSITES
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do
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$IPT -A INPUT -p tcp ! --syn --sport 443 --dport $PORTSUSER -s $x -j ACCEPT
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done
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# FTP (so complex protocol...) authorizations
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for x in $FTPSITES
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do
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# requests on Control connection
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$IPT -A INPUT -p tcp ! --syn --sport 21 --dport $PORTSUSER -s $x -j ACCEPT
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# FTP port-mode on Data Connection
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$IPT -A INPUT -p tcp --sport 20 --dport $PORTSUSER -s $x -j ACCEPT
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# FTP passive-mode on Data Connection
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# WARNING, this allow all connections on TCP ports > 1024
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$IPT -A INPUT -p tcp ! --syn --sport $PORTSUSER --dport $PORTSUSER -s $x -j ACCEPT
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done
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# SSH authorizations
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for x in $SSHOK
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do
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$IPT -A INPUT -p tcp ! --syn --sport 22 -s $x -j ACCEPT
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done
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# SMTP authorizations
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for x in $SMTPOK
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do
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$IPT -A INPUT -p tcp ! --syn --sport 25 --dport $PORTSUSER -s $x -j ACCEPT
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done
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# secure SMTP (TCP/465 et TCP/587) authorizations
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for x in $SMTPSECUREOK
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do
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$IPT -A INPUT -p tcp ! --syn --sport 465 --dport $PORTSUSER -s $x -j ACCEPT
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$IPT -A INPUT -p tcp ! --syn --sport 587 --dport $PORTSUSER -s $x -j ACCEPT
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done
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# NTP authorizations
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for x in $NTPOK
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do
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$IPT -A INPUT -p udp --sport 123 -s $x -j ACCEPT
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$IPT -A OUTPUT -o $INT -p udp -d $x --dport 123 --match state --state NEW -j ACCEPT
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done
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# Always allow ICMP
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$IPT -A INPUT -p icmp -j ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -A INPUT -p icmpv6 -j ACCEPT
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# IPTables policy
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#################
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|
||||||
|
|
||||||
# by default DROP INPUT packets
|
|
||||||
$IPT -P INPUT DROP
|
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -P INPUT DROP
|
|
||||||
|
|
||||||
# by default, no FORWARING (deprecated for Virtual Machines)
|
|
||||||
#echo 0 > /proc/sys/net/ipv4/ip_forward
|
|
||||||
#$IPT -P FORWARD DROP
|
|
||||||
#$IPT6 -P FORWARD DROP
|
|
||||||
|
|
||||||
# by default allow OUTPUT packets... but drop UDP packets (see OUTPUTDROP to drop OUTPUT packets)
|
|
||||||
$IPT -P OUTPUT ACCEPT
|
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -P OUTPUT ACCEPT
|
|
||||||
$IPT -A OUTPUT -o $INT -p udp --dport 33434:33523 --match state --state NEW -j ACCEPT
|
|
||||||
$IPT -A OUTPUT -p udp --match state --state ESTABLISHED,RELATED -j ACCEPT
|
|
||||||
$IPT -A OUTPUT -p udp -j DROP
|
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -o $INT -p udp --dport 33434:33523 --match state --state NEW -j ACCEPT
|
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -p udp --match state --state ESTABLISHED,RELATED -j ACCEPT
|
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -p udp -j DROP
|
|
||||||
|
|
||||||
trap - INT TERM EXIT
|
|
||||||
|
|
||||||
echo "...starting IPTables rules is now finish : OK"
|
|
||||||
;;
|
|
||||||
|
|
||||||
stop)
|
|
||||||
|
|
||||||
echo "Flush all rules and accept everything..."
|
|
||||||
|
|
||||||
# Delete all rules
|
|
||||||
$IPT -F INPUT
|
|
||||||
$IPT -F OUTPUT
|
|
||||||
$IPT -F LOG_DROP
|
|
||||||
$IPT -F LOG_ACCEPT
|
|
||||||
$IPT -F ONLYTRUSTED
|
|
||||||
$IPT -F ONLYPRIVILEGIED
|
|
||||||
$IPT -F NEEDRESTRICT
|
|
||||||
[ "$DOCKER" = "off" ] && $IPT -t nat -F
|
|
||||||
$IPT -t mangle -F
|
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -F INPUT
|
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -F OUTPUT
|
|
||||||
|
|
||||||
if [ "$DOCKER" = "on" ]; then
|
|
||||||
$IPT -F DOCKER-USER
|
|
||||||
$IPT -A DOCKER-USER -j RETURN
|
|
||||||
|
|
||||||
$IPT -F MINIFW-DOCKER-PUB
|
|
||||||
$IPT -X MINIFW-DOCKER-PUB
|
|
||||||
$IPT -F MINIFW-DOCKER-PRIVILEGED
|
|
||||||
$IPT -X MINIFW-DOCKER-PRIVILEGED
|
|
||||||
$IPT -F MINIFW-DOCKER-TRUSTED
|
|
||||||
$IPT -X MINIFW-DOCKER-TRUSTED
|
|
||||||
|
|
||||||
fi
|
|
||||||
|
|
||||||
# Accept all
|
|
||||||
$IPT -P INPUT ACCEPT
|
|
||||||
$IPT -P OUTPUT ACCEPT
|
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -P INPUT ACCEPT
|
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -P OUTPUT ACCEPT
|
|
||||||
#$IPT -P FORWARD ACCEPT
|
|
||||||
#$IPT -t nat -P PREROUTING ACCEPT
|
|
||||||
#$IPT -t nat -P POSTROUTING ACCEPT
|
|
||||||
|
|
||||||
# Delete non-standard chains
|
|
||||||
$IPT -X LOG_DROP
|
|
||||||
$IPT -X LOG_ACCEPT
|
|
||||||
$IPT -X ONLYPRIVILEGIED
|
|
||||||
$IPT -X ONLYTRUSTED
|
|
||||||
$IPT -X NEEDRESTRICT
|
|
||||||
|
|
||||||
echo "...flushing IPTables rules is now finish : OK"
|
|
||||||
;;
|
|
||||||
|
|
||||||
status)
|
|
||||||
|
|
||||||
$IPT -L -n -v --line-numbers
|
|
||||||
$IPT -t nat -L -n -v --line-numbers
|
|
||||||
$IPT -t mangle -L -n -v --line-numbers
|
|
||||||
$IPT6 -L -n -v --line-numbers
|
|
||||||
$IPT6 -t mangle -L -n -v --line-numbers
|
|
||||||
;;
|
|
||||||
|
|
||||||
reset)
|
|
||||||
|
|
||||||
echo "Reset all IPTables counters..."
|
|
||||||
|
|
||||||
$IPT -Z
|
|
||||||
$IPT -t nat -Z
|
|
||||||
$IPT -t mangle -Z
|
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -Z
|
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -t mangle -Z
|
|
||||||
|
|
||||||
echo "...reseting IPTables counters is now finish : OK"
|
|
||||||
;;
|
|
||||||
|
|
||||||
restart)
|
|
||||||
|
|
||||||
$0 stop
|
|
||||||
$0 start
|
|
||||||
;;
|
|
||||||
|
|
||||||
*)
|
|
||||||
|
|
||||||
echo "Usage: $0 {start|stop|restart|status|reset|squid}"
|
|
||||||
exit 1
|
|
||||||
esac
|
|
||||||
|
|
||||||
exit 0
|
|
Loading…
Reference in a new issue