493 lines
13 KiB
Plaintext
493 lines
13 KiB
Plaintext
|
#!/bin/sh
|
||
|
|
||
|
# minifirewall is shellscripts for easy firewalling on a standalone server
|
||
|
# we used netfilter/iptables http://netfilter.org/ designed for recent Linux kernel
|
||
|
# See https://gitea.evolix.org/evolix/minifirewall
|
||
|
|
||
|
# Copyright (c) 2007-2020 Evolix
|
||
|
# This program is free software; you can redistribute it and/or
|
||
|
# modify it under the terms of the GNU General Public License
|
||
|
# as published by the Free Software Foundation; either version 3
|
||
|
# of the License.
|
||
|
|
||
|
# Description
|
||
|
# script for standalone server
|
||
|
|
||
|
# Start or stop minifirewall
|
||
|
#
|
||
|
|
||
|
### BEGIN INIT INFO
|
||
|
# Provides: minfirewall
|
||
|
# Required-Start:
|
||
|
# Required-Stop:
|
||
|
# Should-Start: $network $syslog $named
|
||
|
# Should-Stop: $syslog
|
||
|
# Default-Start: 2 3 4 5
|
||
|
# Default-Stop: 0 1 6
|
||
|
# Short-Description: start and stop the firewall
|
||
|
# Description: Firewall designed for standalone server
|
||
|
### END INIT INFO
|
||
|
|
||
|
DESC="minifirewall"
|
||
|
NAME="minifirewall"
|
||
|
|
||
|
|
||
|
# Variables configuration
|
||
|
#########################
|
||
|
|
||
|
# iptables paths
|
||
|
IPT=/sbin/iptables
|
||
|
IPT6=/sbin/ip6tables
|
||
|
|
||
|
# TCP/IP variables
|
||
|
LOOPBACK='127.0.0.0/8'
|
||
|
CLASSA='10.0.0.0/8'
|
||
|
CLASSB='172.16.0.0/12'
|
||
|
CLASSC='192.168.0.0/16'
|
||
|
CLASSD='224.0.0.0/4'
|
||
|
CLASSE='240.0.0.0/5'
|
||
|
ALL='0.0.0.0'
|
||
|
BROAD='255.255.255.255'
|
||
|
PORTSROOT='0:1023'
|
||
|
PORTSUSER='1024:65535'
|
||
|
|
||
|
chain_exists()
|
||
|
{
|
||
|
local chain_name="$1" ; shift
|
||
|
[ $# -eq 1 ] && local intable="--table $1"
|
||
|
iptables $intable -nL "$chain_name" >/dev/null 2>&1
|
||
|
}
|
||
|
|
||
|
# Configuration
|
||
|
oldconfigfile="/etc/firewall.rc"
|
||
|
configfile="{{ minifirewall_main_file }}"
|
||
|
|
||
|
IPV6=$(grep "IPV6=" {{ minifirewall_main_file }} | awk -F '=' -F "'" '{print $2}')
|
||
|
DOCKER=$(grep "DOCKER=" {{ minifirewall_main_file }} | awk -F '=' -F "'" '{print $2}')
|
||
|
INT=$(grep "INT=" {{ minifirewall_main_file }} | awk -F '=' -F "'" '{print $2}')
|
||
|
|
||
|
case "$1" in
|
||
|
start)
|
||
|
|
||
|
echo "Start IPTables rules..."
|
||
|
|
||
|
# Stop and warn if error!
|
||
|
set -e
|
||
|
trap 'echo "ERROR in minifirewall configuration (fix it now!) or script manipulation (fix yourself)." ' INT TERM EXIT
|
||
|
|
||
|
|
||
|
# sysctl network security settings
|
||
|
##################################
|
||
|
|
||
|
# Don't answer to broadcast pings
|
||
|
echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
|
||
|
|
||
|
# Ignore bogus ICMP responses
|
||
|
echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
|
||
|
|
||
|
# Disable Source Routing
|
||
|
for i in /proc/sys/net/ipv4/conf/*/accept_source_route; do
|
||
|
echo 0 > $i
|
||
|
done
|
||
|
|
||
|
# Enable TCP SYN cookies to avoid TCP-SYN-FLOOD attacks
|
||
|
# cf http://cr.yp.to/syncookies.html
|
||
|
echo 1 > /proc/sys/net/ipv4/tcp_syncookies
|
||
|
|
||
|
# Disable ICMP redirects
|
||
|
for i in /proc/sys/net/ipv4/conf/*/accept_redirects; do
|
||
|
echo 0 > $i
|
||
|
done
|
||
|
|
||
|
for i in /proc/sys/net/ipv4/conf/*/send_redirects; do
|
||
|
echo 0 > $i
|
||
|
done
|
||
|
|
||
|
# Enable Reverse Path filtering : verify if responses use same network interface
|
||
|
for i in /proc/sys/net/ipv4/conf/*/rp_filter; do
|
||
|
echo 1 > $i
|
||
|
done
|
||
|
|
||
|
# log des paquets avec adresse incoherente
|
||
|
for i in /proc/sys/net/ipv4/conf/*/log_martians; do
|
||
|
echo 1 > $i
|
||
|
done
|
||
|
|
||
|
# IPTables configuration
|
||
|
########################
|
||
|
|
||
|
$IPT -N LOG_DROP
|
||
|
$IPT -A LOG_DROP -j LOG --log-prefix '[IPTABLES DROP] : '
|
||
|
$IPT -A LOG_DROP -j DROP
|
||
|
$IPT -N LOG_ACCEPT
|
||
|
$IPT -A LOG_ACCEPT -j LOG --log-prefix '[IPTABLES ACCEPT] : '
|
||
|
$IPT -A LOG_ACCEPT -j ACCEPT
|
||
|
|
||
|
if test -f $oldconfigfile; then
|
||
|
echo "$oldconfigfile is deprecated, rename to $configfile" >&2
|
||
|
exit 1
|
||
|
fi
|
||
|
|
||
|
if ! test -f $configfile; then
|
||
|
echo "$configfile does not exist" >&2
|
||
|
exit 1
|
||
|
fi
|
||
|
|
||
|
tmpfile=`mktemp`
|
||
|
. $configfile 2>$tmpfile >&2
|
||
|
if [ -s $tmpfile ]; then
|
||
|
echo "$configfile returns standard or error output (see below). Stopping." >&2
|
||
|
cat $tmpfile
|
||
|
exit 1
|
||
|
fi
|
||
|
rm $tmpfile
|
||
|
|
||
|
# Trusted ip addresses
|
||
|
$IPT -N ONLYTRUSTED
|
||
|
$IPT -A ONLYTRUSTED -j LOG_DROP
|
||
|
for x in $TRUSTEDIPS
|
||
|
do
|
||
|
$IPT -I ONLYTRUSTED -s $x -j ACCEPT
|
||
|
done
|
||
|
|
||
|
# Privilegied ip addresses
|
||
|
# (trusted ip addresses *are* privilegied)
|
||
|
$IPT -N ONLYPRIVILEGIED
|
||
|
$IPT -A ONLYPRIVILEGIED -j ONLYTRUSTED
|
||
|
for x in $PRIVILEGIEDIPS
|
||
|
do
|
||
|
$IPT -I ONLYPRIVILEGIED -s $x -j ACCEPT
|
||
|
done
|
||
|
|
||
|
# Chain for restrictions (blacklist IPs/ranges)
|
||
|
$IPT -N NEEDRESTRICT
|
||
|
|
||
|
# We allow all on loopback interface
|
||
|
$IPT -A INPUT -i lo -j ACCEPT
|
||
|
[ "$IPV6" != "off" ] && $IPT6 -A INPUT -i lo -j ACCEPT
|
||
|
# if OUTPUTDROP
|
||
|
$IPT -A OUTPUT -o lo -j ACCEPT
|
||
|
[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -o lo -j ACCEPT
|
||
|
|
||
|
# We avoid "martians" packets, typical when W32/Blaster virus
|
||
|
# attacked windowsupdate.com and DNS was changed to 127.0.0.1
|
||
|
# $IPT -t NAT -I PREROUTING -s $LOOPBACK -i ! lo -j DROP
|
||
|
$IPT -A INPUT -s $LOOPBACK ! -i lo -j DROP
|
||
|
|
||
|
|
||
|
if [ "$DOCKER" = "on" ]; then
|
||
|
|
||
|
$IPT -N MINIFW-DOCKER-TRUSTED
|
||
|
$IPT -A MINIFW-DOCKER-TRUSTED -j DROP
|
||
|
|
||
|
$IPT -N MINIFW-DOCKER-PRIVILEGED
|
||
|
$IPT -A MINIFW-DOCKER-PRIVILEGED -j MINIFW-DOCKER-TRUSTED
|
||
|
$IPT -A MINIFW-DOCKER-PRIVILEGED -j RETURN
|
||
|
|
||
|
$IPT -N MINIFW-DOCKER-PUB
|
||
|
$IPT -A MINIFW-DOCKER-PUB -j MINIFW-DOCKER-PRIVILEGED
|
||
|
$IPT -A MINIFW-DOCKER-PUB -j RETURN
|
||
|
|
||
|
# Flush DOCKER-USER if exist, create it if absent
|
||
|
if chain_exists 'DOCKER-USER'; then
|
||
|
$IPT -F DOCKER-USER
|
||
|
else
|
||
|
$IPT -N DOCKER-USER
|
||
|
fi;
|
||
|
|
||
|
# Pipe new connection through MINIFW-DOCKER-PUB
|
||
|
$IPT -A DOCKER-USER -i $INT -m state --state NEW -j MINIFW-DOCKER-PUB
|
||
|
$IPT -A DOCKER-USER -j RETURN
|
||
|
|
||
|
fi
|
||
|
|
||
|
|
||
|
# Local services restrictions
|
||
|
#############################
|
||
|
|
||
|
# Allow services for $INTLAN (local server or local network)
|
||
|
$IPT -A INPUT -s $INTLAN -j ACCEPT
|
||
|
|
||
|
# Enable protection chain for sensible services
|
||
|
for x in $SERVICESTCP1p
|
||
|
do
|
||
|
$IPT -A INPUT -p tcp --dport $x -j NEEDRESTRICT
|
||
|
done
|
||
|
|
||
|
for x in $SERVICESUDP1p
|
||
|
do
|
||
|
$IPT -A INPUT -p udp --dport $x -j NEEDRESTRICT
|
||
|
done
|
||
|
|
||
|
# Public service
|
||
|
for x in $SERVICESTCP1
|
||
|
do
|
||
|
$IPT -A INPUT -p tcp --dport $x -j ACCEPT
|
||
|
[ "$IPV6" != "off" ] && $IPT6 -A INPUT -p tcp --dport $x -j ACCEPT
|
||
|
done
|
||
|
|
||
|
for x in $SERVICESUDP1
|
||
|
do
|
||
|
$IPT -A INPUT -p udp --dport $x -j ACCEPT
|
||
|
[ "$IPV6" != "off" ] && $IPT6 -A INPUT -p udp --dport $x -j ACCEPT
|
||
|
done
|
||
|
|
||
|
# Privilegied services
|
||
|
for x in $SERVICESTCP2
|
||
|
do
|
||
|
$IPT -A INPUT -p tcp --dport $x -j ONLYPRIVILEGIED
|
||
|
done
|
||
|
|
||
|
for x in $SERVICESUDP2
|
||
|
do
|
||
|
$IPT -A INPUT -p udp --dport $x -j ONLYPRIVILEGIED
|
||
|
done
|
||
|
|
||
|
# Private services
|
||
|
for x in $SERVICESTCP3
|
||
|
do
|
||
|
$IPT -A INPUT -p tcp --dport $x -j ONLYTRUSTED
|
||
|
done
|
||
|
|
||
|
for x in $SERVICESUDP3
|
||
|
do
|
||
|
$IPT -A INPUT -p udp --dport $x -j ONLYTRUSTED
|
||
|
done
|
||
|
|
||
|
|
||
|
if [ "$DOCKER" = "on" ]; then
|
||
|
|
||
|
# Public services defined in SERVICESTCP1 & SERVICESUDP1
|
||
|
for dstport in $SERVICESTCP1
|
||
|
do
|
||
|
$IPT -I MINIFW-DOCKER-PUB -p tcp --dport "$dstport" -j RETURN
|
||
|
done
|
||
|
|
||
|
for dstport in $SERVICESUDP1
|
||
|
do
|
||
|
$IPT -I MINIFW-DOCKER-PUB -p udp --dport "$dstport" -j RETURN
|
||
|
done
|
||
|
|
||
|
# Privileged services (accessible from privileged & trusted IPs)
|
||
|
for dstport in $SERVICESTCP2
|
||
|
do
|
||
|
for srcip in $PRIVILEGIEDIPS
|
||
|
do
|
||
|
$IPT -I MINIFW-DOCKER-PRIVILEGED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
|
||
|
done
|
||
|
|
||
|
for srcip in $TRUSTEDIPS
|
||
|
do
|
||
|
$IPT -I MINIFW-DOCKER-PRIVILEGED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
|
||
|
done
|
||
|
done
|
||
|
|
||
|
for dstport in $SERVICESUDP2
|
||
|
do
|
||
|
for srcip in $PRIVILEGIEDIPS
|
||
|
do
|
||
|
$IPT -I MINIFW-DOCKER-PRIVILEGED -p udp -s "$srcip" --dport "$dstport" -j RETURN
|
||
|
done
|
||
|
|
||
|
for srcip in $TRUSTEDIPS
|
||
|
do
|
||
|
$IPT -I MINIFW-DOCKER-PRIVILEGED -p udp -s "$srcip" --dport "$dstport" -j RETURN
|
||
|
done
|
||
|
done
|
||
|
|
||
|
# Trusted services (accessible from trusted IPs)
|
||
|
for dstport in $SERVICESTCP3
|
||
|
do
|
||
|
for srcip in $TRUSTEDIPS
|
||
|
do
|
||
|
$IPT -I MINIFW-DOCKER-TRUSTED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
|
||
|
done
|
||
|
done
|
||
|
|
||
|
for dstport in $SERVICESUDP3
|
||
|
do
|
||
|
for srcip in $TRUSTEDIPS
|
||
|
do
|
||
|
$IPT -I MINIFW-DOCKER-TRUSTED -p udp -s "$srcip" --dport "$dstport" -j RETURN
|
||
|
done
|
||
|
done
|
||
|
fi
|
||
|
|
||
|
# External services
|
||
|
###################
|
||
|
|
||
|
# DNS authorizations
|
||
|
for x in $DNSSERVEURS
|
||
|
do
|
||
|
$IPT -A INPUT -p tcp ! --syn --sport 53 --dport $PORTSUSER -s $x -j ACCEPT
|
||
|
$IPT -A INPUT -p udp --sport 53 --dport $PORTSUSER -s $x -m state --state ESTABLISHED,RELATED -j ACCEPT
|
||
|
$IPT -A OUTPUT -o $INT -p udp -d $x --dport 53 --match state --state NEW -j ACCEPT
|
||
|
done
|
||
|
|
||
|
# HTTP (TCP/80) authorizations
|
||
|
for x in $HTTPSITES
|
||
|
do
|
||
|
$IPT -A INPUT -p tcp ! --syn --sport 80 --dport $PORTSUSER -s $x -j ACCEPT
|
||
|
done
|
||
|
|
||
|
# HTTPS (TCP/443) authorizations
|
||
|
for x in $HTTPSSITES
|
||
|
do
|
||
|
$IPT -A INPUT -p tcp ! --syn --sport 443 --dport $PORTSUSER -s $x -j ACCEPT
|
||
|
done
|
||
|
|
||
|
# FTP (so complex protocol...) authorizations
|
||
|
for x in $FTPSITES
|
||
|
do
|
||
|
# requests on Control connection
|
||
|
$IPT -A INPUT -p tcp ! --syn --sport 21 --dport $PORTSUSER -s $x -j ACCEPT
|
||
|
# FTP port-mode on Data Connection
|
||
|
$IPT -A INPUT -p tcp --sport 20 --dport $PORTSUSER -s $x -j ACCEPT
|
||
|
# FTP passive-mode on Data Connection
|
||
|
# WARNING, this allow all connections on TCP ports > 1024
|
||
|
$IPT -A INPUT -p tcp ! --syn --sport $PORTSUSER --dport $PORTSUSER -s $x -j ACCEPT
|
||
|
done
|
||
|
|
||
|
# SSH authorizations
|
||
|
for x in $SSHOK
|
||
|
do
|
||
|
$IPT -A INPUT -p tcp ! --syn --sport 22 -s $x -j ACCEPT
|
||
|
done
|
||
|
|
||
|
# SMTP authorizations
|
||
|
for x in $SMTPOK
|
||
|
do
|
||
|
$IPT -A INPUT -p tcp ! --syn --sport 25 --dport $PORTSUSER -s $x -j ACCEPT
|
||
|
done
|
||
|
|
||
|
# secure SMTP (TCP/465 et TCP/587) authorizations
|
||
|
for x in $SMTPSECUREOK
|
||
|
do
|
||
|
$IPT -A INPUT -p tcp ! --syn --sport 465 --dport $PORTSUSER -s $x -j ACCEPT
|
||
|
$IPT -A INPUT -p tcp ! --syn --sport 587 --dport $PORTSUSER -s $x -j ACCEPT
|
||
|
done
|
||
|
|
||
|
# NTP authorizations
|
||
|
for x in $NTPOK
|
||
|
do
|
||
|
$IPT -A INPUT -p udp --sport 123 -s $x -j ACCEPT
|
||
|
$IPT -A OUTPUT -o $INT -p udp -d $x --dport 123 --match state --state NEW -j ACCEPT
|
||
|
done
|
||
|
|
||
|
# Always allow ICMP
|
||
|
$IPT -A INPUT -p icmp -j ACCEPT
|
||
|
[ "$IPV6" != "off" ] && $IPT6 -A INPUT -p icmpv6 -j ACCEPT
|
||
|
|
||
|
|
||
|
# IPTables policy
|
||
|
#################
|
||
|
|
||
|
# 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
|