Firewall-VPN

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#!/bin/bash
#!/usr/bin/sh
#!/usr/bin/bash
#!/usr/bin/env sh
#!/usr/bin/env bash
#!/data/data/com.termux/files/usr/bin/sh
#!/data/data/com.termux/files/usr/bin/bash
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#                       Firewall-VPN                          #
#-Info--------------------------------------------------------#
#             Deleting and Adding IpTables Rules              #
#-About-------------------------------------------------------#
#--╼▰[ Skils ]-╼▰[ MultiMan ]                                 #
#--╼▰[ Part of ]-╼▰[ HacKingPro ]                             #
#--╼▰[ Script Name ]-╼▰[ HacKingPro-Firewall-VPN ]            #
#--╼▰[ Author ]-╼▰[ AnLoMinus ]-╼▰[ Leon Yaakobov ]           #
###############################################################
# CREDIT: To All World Creators free Scripts & Tools          #
# BIG THANX TO ALL COMUNITY THAT SHARE ALL THAT FREE          #
# GREAT SCRIPTS                                               #
# Location: Made With LOVE IN ISRAEL !                        #
###############################################################
#-Metadata----------------------------------------------------#
#--╼▰[ Version ]-╼▰[ 1.0.0 ]                                  #
#--╼▰[ Source ]-╼▰[ https://github.com/AnLoMinus/HacKingPro ] #
#--╼▰[ Created ]-╼▰[ 24-11-2022 ]                             #
#--╼▰[ Update ]-╼▰[ 24-11-2022 ]                              #
###############################################################

#--╼▰[ Main Menu ]--╼▰ [ FireWall Rules ]
####### Table of contents
# 1 - IPv4 flush
# 2 - IPv6 flush
# 3 - Ping machine
# 4 - Allow VPN connection only from machine

# IPv4 flush
  iptables -P INPUT ACCEPT
  iptables -P FORWARD ACCEPT
  iptables -P OUTPUT ACCEPT
  iptables -t nat -F
  iptables -t mangle -F
  iptables -F
  iptables -X
  iptables -Z

  
# IPv6 flush
  ip6tables -P INPUT DROP
  ip6tables -P FORWARD DROP
  ip6tables -P OUTPUT DROP
  ip6tables -t nat -F
  ip6tables -t mangle -F
  ip6tables -F
  ip6tables -X
  ip6tables -Z

# Ping machine
  iptables -A INPUT -p icmp -i tun0 -s $1 --icmp-type echo-request -j ACCEPT
  iptables -A INPUT -p icmp -i tun0 -s $1 --icmp-type echo-reply -j ACCEPT
  iptables -A INPUT -p icmp -i tun0 --icmp-type echo-request -j DROP  
  iptables -A INPUT -p icmp -i tun0 --icmp-type echo-reply -j DROP
  iptables -A OUTPUT -p icmp -o tun0 -d $1 --icmp-type echo-reply -j ACCEPT
  iptables -A OUTPUT -p icmp -o tun0 -d $1 --icmp-type echo-request -j ACCEPT
  iptables -A OUTPUT -p icmp -o tun0 --icmp-type echo-request -j DROP
  iptables -A OUTPUT -p icmp -o tun0 --icmp-type echo-reply -j DROP

# Allow VPN connection only from machine
  iptables -A INPUT -i tun0 -p tcp -s $1 -j ACCEPT
  iptables -A OUTPUT -o tun0 -p tcp -d $1 -j ACCEPT
  iptables -A INPUT -i tun0 -p udp -s $1 -j ACCEPT
  iptables -A OUTPUT -o tun0 -p udp -d $1 -j ACCEPT
  iptables -A INPUT -i tun0 -j DROP
  iptables -A OUTPUT -o tun0 -j DROP