#!/bin/sh
<<'LICENSE'
  Part of AREDN -- Used for creating Amateur Radio Emergency Data Networks
  Copyright (C) 2015 Conrad Lara and Joe Ayers
   See Contributors file for additional contributors

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation version 3 of the License.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.

  Additional Terms:

  Additional use restrictions exist on the AREDN(TM) trademark and logo.
    See AREDNLicense.txt for more info.

  Attributions to the AREDN Project must be retained in the source code.
  If importing this code into a new or existing project attribution
  to the AREDN project must be added to the source code.

  You must not misrepresent the origin of the material contained within.

  Modified versions must be modified to attribute to the original source
  and be marked in reasonable ways as differentiate it from the original
  version.

LICENSE

if [ "$MESHFW_TUNNELS_ENABLED" != "1" ]; then
        exit 0;
fi

# Test for pre-existing firewall rules which use a wildcard and only need setup 1 time for multiple tunnel connections
if ( $(iptables -L forwarding_vpn 2>/dev/null | egrep "^Chain forwarding_vpn \(.+ references\)" > /dev/null) ) then
	rules_exist=1
else
	rules_exist=0
fi

# Do nothing on firewall if tunnels already (or still) exist--set up once.
if [ $rules_exist -eq 0  ] ; then
	echo "Adding vtun firewall rules..."
        iptables -N forwarding_vpn
        iptables -N zone_vpn_input
        iptables -N zone_vpn_ACCEPT
        iptables -N zone_vpn_DROP
        iptables -N zone_vpn_REJECT
        iptables -N zone_vpn_forward
        iptables -I delegate_forward 3 -i tun+ -j zone_vpn_forward
        iptables -I delegate_input 5 -i tun+ -j zone_vpn_input
        iptables -I delegate_output 3 -j zone_vpn_ACCEPT
        iptables -A zone_vpn_input -p icmp -m icmp --icmp-type 8 -j ACCEPT
        iptables -A zone_vpn_input -p tcp -m tcp --dport 2222 -j ACCEPT
        iptables -A zone_vpn_input -p tcp -m tcp --dport 8080 -j ACCEPT
        iptables -A zone_vpn_input -p udp -m udp --dport 698 -j ACCEPT
        iptables -A zone_vpn_input -p tcp -m tcp --dport 1978 -j ACCEPT
        iptables -A zone_vpn_input -p tcp -m tcp --dport 23 -j ACCEPT
        iptables -A zone_vpn_input -p tcp -m tcp --dport 9090 -j ACCEPT
        iptables -A zone_vpn_input -p udp -m udp --dport 161 -j ACCEPT
        iptables -A zone_vpn_input -j zone_vpn_REJECT
        iptables -I zone_vpn_forward 1 -j zone_vpn_ACCEPT
	if [ "$MESHFW_MESHGW" -eq 1 ] ; then
        	iptables -I zone_vpn_forward -j zone_wan_dest_ACCEPT
	else
        	iptables -I zone_vpn_forward -j zone_wan_dest_REJECT
	fi
        iptables -A zone_vpn_ACCEPT -o tun+ -j ACCEPT
        iptables -A zone_vpn_ACCEPT -i tun+ -j ACCEPT
        iptables -A zone_vpn_DROP -o tun+ -j DROP
        iptables -A zone_vpn_DROP -i tun+ -j DROP
        iptables -A zone_vpn_REJECT -o tun+ -j reject
        iptables -A zone_vpn_REJECT -i tun+ -j reject
        iptables -A zone_vpn_forward -j zone_dtdlink_dest_ACCEPT
        iptables -A zone_vpn_forward -j zone_lan_dest_ACCEPT
        iptables -A zone_vpn_forward -j zone_wifi_dest_ACCEPT
        iptables -A zone_vpn_forward -j forwarding_vpn
fi


# Rules that modify core tables and as such always need to be executed as they are flushed on reload/restart
iptables -I delegate_forward 3 -i tun+ -j zone_vpn_forward
iptables -I delegate_input 5 -i tun+ -j zone_vpn_input
iptables -I delegate_output 3 -j zone_vpn_ACCEPT
iptables -I zone_dtdlink_forward 1 -j zone_vpn_ACCEPT
iptables -I zone_lan_forward 1 -j zone_vpn_ACCEPT
iptables -I zone_wifi_forward 1 -j zone_vpn_ACCEPT