#!/bin/bash # prevent SYNC-floods: echo 1 > /proc/sys/net/ipv4/tcp_syncookies # initialize: iptables -F iptables -X iptables -Z # config default policy's: iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP iptables -N LOGDROP iptables -A LOGDROP -j LOG iptables -A LOGDROP -j DROP # kernel tweaks: /bin/echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts /bin/echo 0 > /proc/sys/net/ipv4/conf/all/accept_source_route /bin/echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses /bin/echo 1 > /proc/sys/net/ipv4/conf/all/log_martians /bin/echo 0 > /proc/sys/net/ipv4/ip_forward # allow loopback: iptables -A INPUT -i lo -j ACCEPT iptables -A OUTPUT -o lo -j ACCEPT # allow asds.id.rug.nl iptables -A INPUT -i eth0 -s 129.125.2.50 -j ACCEPT iptables -A OUTPUT -o eth0 -d 129.125.2.50 -j ACCEPT # allow vlan933: iptables -A INPUT -i bond0.933 -j ACCEPT iptables -A OUTPUT -o bond0.933 -j ACCEPT # allow vlan934: iptables -A INPUT -i bond0.934 -j ACCEPT iptables -A OUTPUT -o bond0.934 -j ACCEPT #allow outbound to databases: iptables -A INPUT -p tcp -s 129.125.36.182 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.182 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.183 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.183 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.184 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.184 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.185 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.185 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.186 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.186 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.187 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.187 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.188 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.188 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.141 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.141 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.142 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.142 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.143 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.143 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.144 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.144 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.148 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.148 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.149 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.149 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.150 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.150 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.50.147 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.50.147 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.71 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.71 -j ACCEPT # allow munin-statieken-server: iptables -A INPUT -p tcp -s 129.125.50.91 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.50.91 -j ACCEPT # allow agenda: iptables -A INPUT -p tcp -s 129.125.2.116 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.2.116 -j ACCEPT # allow imap.google.com: iptables -A INPUT -p tcp -s 74.125.136/24 -j ACCEPT iptables -A OUTPUT -p tcp -d 74.125.136/24 -j ACCEPT # allow imap.rug.nl: iptables -A INPUT -p tcp -s 129.125.2.81/32 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.2.81/32 -j ACCEPT # allow more google: iptables -A INPUT -p tcp -s 173.194.65.0/24 -j ACCEPT iptables -A OUTPUT -p tcp -d 173.194.65.0/24 -j ACCEPT # new tcp packets sync packets: iptables -A INPUT -i eth0 -p tcp ! --syn -m state --state NEW -j DROP # refuse loopback pacts incoming eth0: iptables -A INPUT -i eth0 -d 127.0.0.0/8 -j DROP # allow dns outbound to/from DNS server: iptables -A INPUT -i eth0 -p udp --sport 53 -j ACCEPT iptables -A OUTPUT -o eth0 -p udp --dport 53 -j ACCEPT # allow www outbound to 80: iptables -A INPUT -i eth0 -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT # allow www outbound to 443: iptables -A INPUT -i eth0 -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT # allow smtp outbound: iptables -A INPUT -i eth0 -p tcp --sport 25 -m state --state ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --dport 25 -m state --state NEW,ESTABLISHED -j ACCEPT # allow ssh from BWP: iptables -A INPUT -i eth0 -p tcp -s 129.125.249.0/24 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp -d 129.125.249.0/24 -m state --state ESTABLISHED -j ACCEPT # log/drop the rest: iptables -A INPUT -i eth0 -s 129.125.0.0/16 -d 129.125.36.121/32 -j LOGDROP #zabbix monitorings iptables -A INPUT -i eth0 -s 129.125.50.238 -j ACCEPT iptables -A OUTPUT -o eth0 -d 129.125.50.238 -j ACCEPT # allow 9080 inbound: iptables -A INPUT -i eth0 -p tcp --dport 9080 -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 9080 -j ACCEPT # allow 2222 inbound: iptables -A INPUT -i eth0 -p tcp -s 129.125.249.0/24 --dport 2222 -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp -d 129.125.249.0/24 --sport 2222 -j ACCEPT # inbound gadgets: iptables -A INPUT -i eth0 -p tcp -m state --state ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp -m state --state NEW,ESTABLISHED -j ACCEPT # allow from operator: iptables -A INPUT -i eth0 -s 129.125.50.41/32 -j ACCEPT iptables -A OUTPUT -o eth0 -d 129.125.50.41/32 -j ACCEPT # allow from/to ldap: iptables -A INPUT -i eth0 -s 129.125.68.50/32 -j ACCEPT iptables -A OUTPUT -o eth0 -d 129.125.68.50/32 -j ACCEPT # ldaps outbound: iptables -A INPUT -i eth0 -p tcp --sport 636 -m state --state ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --dport 636 -m state --state NEW,ESTABLISHED -j ACCEPT # allow nfs: iptables -A INPUT -i eth0 -s 129.125.50.171/32 -j ACCEPT iptables -A OUTPUT -o eth0 -d 129.125.50.171/32 -j ACCEPT # allow ntp iptables -A INPUT -i eth0 -p tcp --sport 123 -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --dport 123 -j ACCEPT iptables -A INPUT -i eth0 -p udp --sport 123 -j ACCEPT iptables -A OUTPUT -o eth0 -p udp --dport 123 -j ACCEPT # allow charanga: iptables -A INPUT -i eth0 -p tcp -s 129.125.60.94/32 --dport 22 -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp -d 129.125.60.94/32 --sport 22 -j ACCEPT # charanga 129.125.60.94 port 2222: iptables -A INPUT -i eth0 -p tcp -s 129.125.60.94/32 --dport 2222 -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp -d 129.125.60.94/32 --sport 2222 -j ACCEPT # allow imaps: iptables -A INPUT -p tcp --sport 993 -j ACCEPT iptables -A OUTPUT -p tcp --dport 993 -j ACCEPT # Flush & default ip6tables -F INPUT ip6tables -F OUTPUT ip6tables -F FORWARD # setup log-chain: ip6tables -N LOGREJECT ip6tables -A LOGREJECT -j LOG ip6tables -A LOGREJECT -j REJECT # Set the default policy to drop ip6tables -P INPUT DROP ip6tables -P OUTPUT DROP ip6tables -P FORWARD DROP # rules: ip6tables -A INPUT -i lo -j ACCEPT ip6tables -A INPUT -j REJECT ip6tables -A OUTPUT -j REJECT # allow ganglia-statieken-server: iptables -A INPUT -p tcp -s 129.125.60.89 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.60.89 -j ACCEPT iptables -A INPUT -p tcp -s 129.125.36.191 -j ACCEPT iptables -A OUTPUT -p tcp -d 129.125.36.191 -j ACCEPT # open up port 9100 prometues: iptables -A INPUT -i eth0 -p tcp -s 129.125.2.233/32 --dport 9100 -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp -d 129.125.2.233/32 --sport 9100 -j ACCEPT # allow icmp: iptables -A INPUT -p icmp -j ACCEPT iptables -A OUTPUT -p icmp -j ACCEPT