Hello, i'm basicFW.sh, a script remade by @AtaxyaNetwork
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157
basicFW.sh
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157
basicFW.sh
Executable file
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#!/bin/bash
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#
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# Original script: firewall.sh - Copyright (c) 2019-2021 - Olivier Poncet
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#
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# Forked by @AtaxyaNetwork
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>
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#
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# ----------------------------------------------------------------------------
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# Choose the primary network interface : eth0, eno1, ens18, enp3s0, etc ...
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# ----------------------------------------------------------------------------
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echo "Please, select a network interface:"
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PS3="Your choice: "
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QUIT="QUIT THIS PROGRAM - I feel safe now."
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touch "$QUIT"
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select Network_interfaces in $(ls /sys/class/net);
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do
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case $Network_interfaces in
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"$QUIT")
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echo "Exiting."
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break
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;;
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*)
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echo "You picked $Network_interfaces"
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WAN0=$Network_interfaces
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break
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;;
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esac
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done
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rm "$QUIT"
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# ----------------------------------------------------------------------------
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# looking for iptables & ip6tables
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# ----------------------------------------------------------------------------
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IP4TABLES="$(which iptables || echo 'not-found')"
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IP6TABLES="$(which ip6tables || echo 'not-found')"
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# ----------------------------------------------------------------------------
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# check for variables
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# ----------------------------------------------------------------------------
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if [ "${WAN0}" = "not-set" ]
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then
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echo "*** WAN0 was not set ***"
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HAS_ERROR="yes"
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fi
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if [ "${IP4TABLES}" = "not-found" ]
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then
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echo "*** iptables was not found ***"
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HAS_ERROR="yes"
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fi
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if [ "${IP6TABLES}" = "not-found" ]
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then
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echo "*** ip6tables was not found ***"
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HAS_ERROR="yes"
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fi
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####
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# Flush IPtables && apply universal rules
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####
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${IP4TABLES} -t filter -F
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${IP6TABLES} -t filter -F
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${IP4TABLES} -t filter -P INPUT ACCEPT
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${IP6TABLES} -t filter -P INPUT ACCEPT
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${IP4TABLES} -t filter -A INPUT -i "${WAN0}" -p all -m state --state ESTABLISHED,RELATED -j ACCEPT
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${IP6TABLES} -t filter -A INPUT -i "${WAN0}" -p all -m state --state ESTABLISHED,RELATED -j ACCEPT
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# ----------------------------------------------------------------------------
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# Drop all by default
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# ----------------------------------------------------------------------------
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RULE_ICMP____TARGET="DROP"
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RULE_SNMP____TARGET="DROP"
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RULE_SSH_____TARGET="DROP"
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RULE_HTTP____TARGET="DROP"
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RULE_HTTPS___TARGET="DROP"
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RULE_DEFAULT_TARGET="DROP"
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cmd=(dialog --separate-output --checklist "Select protocol to accept" 22 76 16)
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options=(1 "ICMP" on # any option can be set to default to "on"
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2 "SSH" off
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3 "HTTP" off
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4 "HTTPS" off
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5 "SNMP" off)
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choices=$("${cmd[@]}" "${options[@]}" 2>&1 >/dev/tty)
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clear
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for choice in $choices
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do
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case $choice in
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1)
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RULE_ICMP____TARGET="ACCEPT"
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${IP4TABLES} -t filter -A INPUT -i "${WAN0}" -p icmp -j "${RULE_ICMP____TARGET}"
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${IP6TABLES} -t filter -A INPUT -i "${WAN0}" -p icmp -j "${RULE_ICMP____TARGET}"
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;;
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2)
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RULE_SSH_____TARGET="ACCEPT"
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${IP4TABLES} -t filter -A INPUT -i "${WAN0}" -p tcp --dport ssh -j "${RULE_SSH_____TARGET}"
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${IP6TABLES} -t filter -A INPUT -i "${WAN0}" -p tcp --dport ssh -j "${RULE_SSH_____TARGET}"
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;;
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3)
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RULE_HTTP____TARGET="ACCEPT"
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${IP4TABLES} -t filter -A INPUT -i "${WAN0}" -p tcp --dport http -j "${RULE_HTTP____TARGET}"
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${IP6TABLES} -t filter -A INPUT -i "${WAN0}" -p tcp --dport http -j "${RULE_HTTP____TARGET}"
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;;
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4)
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RULE_HTTPS___TARGET="ACCEPT"
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${IP4TABLES} -t filter -A INPUT -i "${WAN0}" -p tcp --dport https -j "${RULE_HTTPS___TARGET}"
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${IP6TABLES} -t filter -A INPUT -i "${WAN0}" -p tcp --dport https -j "${RULE_HTTPS___TARGET}"
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;;
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5)
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RULE_SNMP____TARGET="ACCEPT"
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read -p "Saisir le préfix v4 à whitelister pour le SNMP: " SNMP4_TARGET
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read -p"Saisir le préfix v6 à whitelister pour le SNMP: " SNMP6_TARGET
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${IP4TABLES} -t filter -A INPUT -i "${WAN0}" -p udp -s "${SNMP4_TARGET}" --dport 161 -j "${RULE_SNMP____TARGET}"
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${IP6TABLES} -t filter -A INPUT -i "${WAN0}" -p udp -s "${SNMP6_TARGET}" --dport 161 -j "${RULE_SNMP____TARGET}"
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;;
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esac
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done
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#####
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# Apply default policy
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####
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${IP4TABLES} -t filter -A INPUT -i "${WAN0}" -j "${RULE_DEFAULT_TARGET}"
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${IP6TABLES} -t filter -A INPUT -i "${WAN0}" -j "${RULE_DEFAULT_TARGET}"
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#####
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# Print iptables -nvl
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####
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${IP4TABLES} -t filter -L -n
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${IP6TABLES} -t filter -L -n
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echo ""
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echo "Forked with love by @AtaxyaNetwork"
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# ----------------------------------------------------------------------------
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# End-Of-File
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# ----------------------------------------------------------------------------
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