iptables_ipsec_pptp.rules

gistfile1.sh

#!/bin/sh

# Flush old rules, old custom tables
/sbin/iptables --flush
/sbin/iptables --flush -t nat
/sbin/iptables --delete-chain

# Set default policies for all three default chains
/sbin/iptables -P INPUT DROP
/sbin/iptables -P FORWARD DROP
/sbin/iptables -P OUTPUT ACCEPT

# Enable free use of loopback interfaces
/sbin/iptables -A INPUT -i lo -j ACCEPT
/sbin/iptables -A OUTPUT -o lo -j ACCEPT

# Allow VPN forwarding
/sbin/iptables -A FORWARD -i tun+ -j ACCEPT
/sbin/iptables -A FORWARD -o tun+ -j ACCEPT
/sbin/iptables -A FORWARD -i dns+ -j ACCEPT
/sbin/iptables -A FORWARD -o dns+ -j ACCEPT
/sbin/iptables -F FORWARD
/sbin/iptables -A FORWARD -j ACCEPT
/sbin/iptables -I FORWARD -s 172.7.0.0/24 -p tcp --syn -i ppp+ -j TCPMSS --set-mss 1300

# Accept limited inbound ICMP messages
/sbin/iptables -I INPUT -p icmp --icmp-type echo-request -m recent --set
/sbin/iptables -I INPUT -p icmp --icmp-type echo-request -m recent --update --seconds 5 --hitcount 10 -j DROP
/sbin/iptables -A INPUT -p icmp -j ACCEPT


# All TCP sessions should begin with SYN
/sbin/iptables -A INPUT -p tcp ! --syn -m state --state NEW -s 0/0 -j DROP

# Accept inbound TCP packets
/sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

/sbin/iptables -A INPUT -p tcp --dport 22 -m state --state NEW -j ACCEPT
/sbin/iptables -A INPUT -p tcp --dport 80 -m state --state NEW -j ACCEPT
/sbin/iptables -A INPUT -p tcp --dport 443 -m state --state NEW -j ACCEPT
/sbin/iptables -A INPUT -p tcp --dport 8088 -m state --state NEW -j ACCEPT
/sbin/iptables -A INPUT -p gre -j ACCEPT

# Accept inbound UDP packets
/sbin/iptables -A INPUT -p udp -m udp --dport 53 -j ACCEPT
/sbin/iptables -A INPUT -p udp -m udp --dport 1194 -j ACCEPT
/sbin/iptables -A INPUT -p 47 -j ACCEPT
/sbin/iptables -A OUTPUT -p 47 -j ACCEPT
/sbin/iptables -A INPUT -i ppp+ -j ACCEPT
/sbin/iptables -A OUTPUT -o ppp+ -j ACCEPT
/sbin/iptables -A INPUT -p tcp -m tcp --dport 1723 -j ACCEPT

# Accept IPSEC packets
/sbin/iptables -A INPUT -p esp -j ACCEPT
/sbin/iptables -A INPUT -p 50 -j ACCEPT
/sbin/iptables -A INPUT -p 51 -j ACCEPT
/sbin/iptables -A INPUT -p udp --dport 500 -j ACCEPT
/sbin/iptables -A INPUT -p udp --dport 4500 -j ACCEPT
/sbin/iptables -A INPUT -p udp --dport 8088 -j ACCEPT
/sbin/iptables -A INPUT -p udp --dport 53 -j ACCEPT

# VPN NAT
/sbin/iptables -t nat -A POSTROUTING -s 172.7.0.0/24 -o eth0 -j MASQUERADE
/sbin/iptables -t nat -A POSTROUTING -s 10.7.0.0/24 -o eth0 -j MASQUERADE
/sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
/sbin/iptables -t nat -A POSTROUTING -o venet0 -j MASQUERADE
/sbin/iptables -t nat -A POSTROUTING -o venet0:0 -j MASQUERADE