gistfile1.txt

iptables -F
iptables -X

iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -P FORWARD DROP

iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

# http outbound
iptables -A INPUT -p tcp --source-port 80 -m state --state ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp --destination-port 80 -m state --state NEW -j ACCEPT

# https outbound
iptables -A INPUT -p tcp --destination-port 443 -m state --state ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp --source-port 443 -m state --state NEW -j ACCEPT

# mongodb private network
iptables -A INPUT -s 10.128.240.125 -p tcp --destination-port 27017 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -d 10.128.240.125 -p tcp --source-port 27017 -m state --state ESTABLISHED -j ACCEPT

# ssh
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
iptables -A OUTPUT -p tcp --sport 22 -j ACCEPT

# dns
iptables -A OUTPUT -p tcp --dport 53 -j ACCEPT
iptables -A OUTPUT -p udp --dport 53 -j ACCEPT

# ping outbound
iptables -A OUTPUT -p icmp --icmp-type 8 -s $SERVER_IP -d 0/0 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -p icmp --icmp-type 0 -s 0/0 -d $SERVER_IP -m state --state ESTABLISHED,RELATED -j ACCEPT

iptables -A INPUT -j DROP
iptables -A OUTPUT -j DROP