gistfile1.txt

i=/sbin/iptables
 
# Flush all rules
$i -F
$i -X
 
# Setup default filter policy
$i -P INPUT DROP
$i -P OUTPUT DROP
$i -P FORWARD DROP

# Allow established connections
$i -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
 
# Allow unlimited traffic on loopback
$i -A INPUT -i lo -j ACCEPT
$i -A OUTPUT -o lo -j ACCEPT
 
# Open nginx
$i -A INPUT -p tcp --dport 443 -j ACCEPT
$i -A INPUT -p tcp --dport 80 -j ACCEPT

# Open SSH
$i -A INPUT -p tcp --dport 22 -j ACCEPT