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Full IPv6 support

dev
Victor LABORIE 4 years ago
parent
commit
4cce49988b
  1. 233
      minifirewall
  2. 5
      minifirewall.conf

233
minifirewall

@ -41,6 +41,7 @@ IPT6=/sbin/ip6tables
# TCP/IP variables
LOOPBACK='127.0.0.0/8'
LOOPBACK6='::1'
CLASSA='10.0.0.0/8'
CLASSB='172.16.0.0/12'
CLASSC='192.168.0.0/16'
@ -52,6 +53,47 @@ PORTSROOT='0:1023'
PORTSUSER='1024:65535'
ipxtables() {
set +e
ip=$1
echo "$ip"|grep -q ":"
if [ $? -ne 0 ]; then
echo $IPT
else
echo $IPT6
fi
set -e
}
ipalltables() {
iptables $@
ip6tables $@
}
check_addr() {
set +e
addr=$1
echo $addr|grep -q "/"
if [ $? -eq 0 ]; then
echo $addr
else
host=$(host $addr)
if [ $? -ne 0 ]; then
echo "WARNING: $addr is invalid !" >&2
else
echo "$host"|grep -q "address"
if [ $? -eq 0 ]; then
echo "$host"|grep -v "mail"|awk '{ print $NF }'|while read ip; do
echo $ip
done
else
echo $addr
fi
fi
fi
set -e
}
case "$1" in
start)
@ -102,12 +144,12 @@ 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
ipalltables -N LOG_DROP
ipalltables -A LOG_DROP -j LOG #--log-prefix '[IPTABLES DROP] : '
ipalltables -A LOG_DROP -j DROP
ipalltables -N LOG_ACCEPT
ipalltables -A LOG_ACCEPT -j LOG #--log-prefix '[IPTABLES ACCEPT] : '
ipalltables -A LOG_ACCEPT -j ACCEPT
# Configuration
oldconfigfile="/etc/firewall.rc"
@ -133,36 +175,37 @@ 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
ipalltables -N ONLYTRUSTED
ipalltables -A ONLYTRUSTED -j LOG_DROP
for addr in $TRUSTEDIPS; do
check_addr $addr|while read ip; do
$(ipxtables $ip) -I ONLYTRUSTED -s $ip -j ACCEPT
done
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
ipalltables -N ONLYPRIVILEGIED
ipalltables -A ONLYPRIVILEGIED -j ONLYTRUSTED
for addr in $PRIVILEGIEDIPS; do
check_addr $addr|while read ip; do
$(ipxtables $ip) -I ONLYPRIVILEGIED -s $ip -j ACCEPT
done
done
# Chain for restrictions (blacklist IPs/ranges)
$IPT -N NEEDRESTRICT
ipalltables -N NEEDRESTRICT
# We allow all on loopback interface
$IPT -A INPUT -i lo -j ACCEPT
[ "$IPV6" != "off" ] && $IPT6 -A INPUT -i lo -j ACCEPT
ipalltables -A INPUT -i lo -j ACCEPT
# if OUTPUTDROP
$IPT -A OUTPUT -o lo -j ACCEPT
[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -o lo -j ACCEPT
ipalltables -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
# ipalltables -t NAT -I PREROUTING -s $LOOPBACK -i ! lo -j DROP
$IPT -A INPUT -s $LOOPBACK ! -i lo -j DROP
$IPT6 -A INPUT -s $LOOPBACK6 ! -i lo -j DROP
# Local services restrictions
@ -174,47 +217,45 @@ $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
ipalltables -A INPUT -p tcp --dport $x -j NEEDRESTRICT
done
for x in $SERVICESUDP1p
do
$IPT -A INPUT -p udp --dport $x -j NEEDRESTRICT
ipalltables -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
ipalltables -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
ipalltables -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
ipalltables -A INPUT -p tcp --dport $x -j ONLYPRIVILEGIED
done
for x in $SERVICESUDP2
do
$IPT -A INPUT -p udp --dport $x -j ONLYPRIVILEGIED
ipalltables -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
ipalltables -A INPUT -p tcp --dport $x -j ONLYTRUSTED
done
for x in $SERVICESUDP3
do
$IPT -A INPUT -p udp --dport $x -j ONLYTRUSTED
ipalltables -A INPUT -p udp --dport $x -j ONLYTRUSTED
done
@ -224,87 +265,89 @@ for x in $SERVICESUDP3
# 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
ipalltables -A INPUT -p tcp ! --syn --sport 53 --dport $PORTSUSER -s $x -j ACCEPT
ipalltables -A INPUT -p udp --sport 53 --dport $PORTSUSER -s $x -m state --state ESTABLISHED,RELATED -j ACCEPT
ipalltables -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
for addr in $HTTPSITES
do
$IPT -A INPUT -p tcp ! --syn --sport 80 --dport $PORTSUSER -s $x -j ACCEPT
check_addr $addr|while read ip; do
$(ipxtables $ip) -A INPUT -p tcp ! --syn --sport 80 --dport $PORTSUSER -s $ip -j ACCEPT
done
done
# HTTPS (TCP/443) authorizations
for x in $HTTPSSITES
for addr in $HTTPSSITES
do
$IPT -A INPUT -p tcp ! --syn --sport 443 --dport $PORTSUSER -s $x -j ACCEPT
check_addr $addr|while read ip; do
$(ipxtables $ip) -A INPUT -p tcp ! --syn --sport 443 --dport $PORTSUSER -s $ip -j ACCEPT
done
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
ipalltables -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
ipalltables -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
ipalltables -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
ipalltables -A INPUT -p tcp ! --syn --sport 22 -s $x -j ACCEPT
done
# SMTP authorizations
for x in $SMTPOK
for addr in $SMTPOK
do
$IPT -A INPUT -p tcp ! --syn --sport 25 --dport $PORTSUSER -s $x -j ACCEPT
check_addr $addr|while read ip; do
$(ipxtables $ip) -A INPUT -p tcp ! --syn --sport 25 --dport $PORTSUSER -s $ip -j ACCEPT
done
done
# secure SMTP (TCP/465 et TCP/587) authorizations
for x in $SMTPSECUREOK
for addr 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
check_addr $addr|while read ip; do
$(ipxtables $ip) -A INPUT -p tcp ! --syn --sport 465 --dport $PORTSUSER -s $ip -j ACCEPT
$(ipxtables $ip) -A INPUT -p tcp ! --syn --sport 587 --dport $PORTSUSER -s $ip -j ACCEPT
done
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
ipalltables -A INPUT -p udp --sport 123 -s $x -j ACCEPT
ipalltables -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
ipalltables -A INPUT -p icmp -j ACCEPT
# IPTables policy
#################
# by default DROP INPUT packets
$IPT -P INPUT DROP
[ "$IPV6" != "off" ] && $IPT6 -P INPUT DROP
ipalltables -P INPUT DROP
# by default, no FORWARING (deprecated for Virtual Machines)
#echo 0 > /proc/sys/net/ipv4/ip_forward
#$IPT -P FORWARD DROP
#$IPT6 -P FORWARD DROP
#ipalltables -P FORWARD DROP
#ipalltables6 -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
ipalltables -P OUTPUT ACCEPT
ipalltables -A OUTPUT -o $INT -p udp --dport 33434:33523 --match state --state NEW -j ACCEPT
ipalltables -A OUTPUT -p udp --match state --state ESTABLISHED,RELATED -j ACCEPT
ipalltables -A OUTPUT -p udp -j DROP
trap - INT TERM EXIT
@ -316,55 +359,47 @@ trap - INT TERM EXIT
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
$IPT -t nat -F
$IPT -t mangle -F
[ "$IPV6" != "off" ] && $IPT6 -F INPUT
[ "$IPV6" != "off" ] && $IPT6 -F OUTPUT
ipalltables -F INPUT
ipalltables -F OUTPUT
ipalltables -F LOG_DROP
ipalltables -F LOG_ACCEPT
ipalltables -F ONLYTRUSTED
ipalltables -F ONLYPRIVILEGIED
ipalltables -F NEEDRESTRICT
ipalltables -t nat -F
ipalltables -t mangle -F
# 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
ipalltables -P INPUT ACCEPT
ipalltables -P OUTPUT ACCEPT
#ipalltables -P FORWARD ACCEPT
#ipalltables -t nat -P PREROUTING ACCEPT
#ipalltables -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
ipalltables -X LOG_DROP
ipalltables -X LOG_ACCEPT
ipalltables -X ONLYPRIVILEGIED
ipalltables -X ONLYTRUSTED
ipalltables -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
ipalltables -L -n -v --line-numbers
ipalltables -t nat -L -n -v --line-numbers
ipalltables -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
ipalltables -Z
ipalltables -t nat -Z
ipalltables -t mangle -Z
echo "...reseting IPTables counters is now finish : OK"
;;

5
minifirewall.conf

@ -5,15 +5,12 @@
# Main interface
INT='eth0'
# IPv6
IPV6=on
# Trusted IPv4 local network
# ...will be often IP/32 if you don't trust anything
INTLAN='192.168.0.2/32'
# Trusted IPv4 addresses for private and semi-public services
TRUSTEDIPS='62.212.121.90 88.179.18.233 31.170.8.4 31.170.9.129'
TRUSTEDIPS='62.212.121.90 88.179.18.233 31.170.8.4 31.170.9.129 2a01:9500:37:129::/64'
# Privilegied IPv4 addresses for semi-public services
# (no need to add again TRUSTEDIPS)

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