Pasted

#!/bin/sh
 # iptables script generated 2018-10-03
# http://www.mista.nu/iptables
 IPT="/sbin/iptables"
 # Flush old rules, old custom tables
$IPT --flush
$IPT --delete-chain
 # Set default policies for all three default chains
$IPT -P INPUT DROP
$IPT -P FORWARD DROP
$IPT -P OUTPUT ACCEPT
 # Enable free use of loopback interfaces
$IPT -A INPUT -i lo -j ACCEPT
$IPT -A OUTPUT -o lo -j ACCEPT
 # All TCP sessions should begin with SYN
$IPT -A INPUT -p tcp ! --syn -m state --state NEW -s 0.0.0.0/0 -j DROP
 # Accept inbound TCP packets
$IPT -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPT -A INPUT -p tcp --dport 22 -m state --state NEW -s 0.0.0.0/0 -j ACCEPT
$IPT -A INPUT -p tcp --dport 80 -m state --state NEW -s 0.0.0.0/0 -j ACCEPT
$IPT -A INPUT -p tcp --dport 443 -m state --state NEW -s 0.0.0.0/0 -j ACCEPT