#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

#flush iptables
iptables -F
ip6tables -F
iptables -t nat -F
ip6tables -t nat -F

#accept already established connections
iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
ip6tables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
ip6tables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
#allow tor traffic
for tor in debian-tor _tor-1 _tor-2 _tor-3 _tor-4 _tor-5 _tor-6 _tor-7 _tor-8 _tor-9 _tor-a _tor-b _tor-c _tor-d _tor-e _tor-f _tor-g _tor-h _tor-i _tor-j _tor-k _tor-l _tor-m _tor-n _tor-o _tor-p _tor-q _tor-r _tor-s _tor-t _tor-u _tor-v _tor-w _tor-x _tor-y _tor-z; do(
iptables -t nat -A OUTPUT -m owner --uid-owner $tor -j RETURN;
ip6tables -t nat -A OUTPUT -m owner --uid-owner $tor -j RETURN;
iptables -A OUTPUT -m owner --uid-owner $tor -j ACCEPT;
ip6tables -A OUTPUT -m owner --uid-owner $tor -j ACCEPT;
)done
#redirect all outgoing DNS querries to our tor
iptables -t nat -A OUTPUT -p udp --dport 53 -j REDIRECT --to-ports 53
ip6tables -t nat -A OUTPUT -p udp --dport 53 -j REDIRECT --to-ports 53
#allow querriying ntp servers (must mach /etc/systemd/timesyncd.conf
for clearnet in 88.191.68.178 51.15.142.60 51.255.197.148 91.121.181.58; do(
iptables -t nat -A OUTPUT -p udp --dport 123 -d $clearnet -j RETURN;
iptables -A OUTPUT -p udp --dport 123 -d $clearnet -j ACCEPT
)done
#restrict local communication for php and webserver
#allowed tcp ports
for port in 3306 9040 9050 110 143 25 21 5000:5050 53; do(
iptables -A OUTPUT -d 127.0.0.0/8 -p tcp --dport $port -m owner --gid-owner www-data -j ACCEPT;
ip6tables -A OUTPUT -d ::1 -p tcp --dport $port -m owner --gid-owner www-data -j ACCEPT
)done
#accept DNS
iptables -A OUTPUT -d 127.0.0.0/8 -p udp --dport 53 -m owner --gid-owner www-data -j ACCEPT
ip6tables -A OUTPUT -d ::1 -p udp --dport 53 -m owner --gid-owner www-data -j ACCEPT
#REJECT all others
iptables -A OUTPUT -d 127.0.0.0/8 -m owner --gid-owner www-data -j REJECT
ip6tables -A OUTPUT -d ::1 -m owner --gid-owner www-data -j REJECT
#unrestricted access to these IPs
for clearnet in 127.0.0.0/8; do(
iptables -t nat -A OUTPUT -d $clearnet -j RETURN;
iptables -A OUTPUT -d $clearnet -j ACCEPT;
) done
for clearnet in ::1; do(
ip6tables -t nat -A OUTPUT -d $clearnet -j RETURN;
ip6tables -A OUTPUT -d $clearnet -j ACCEPT;
) done
#redirect everything else
iptables -t nat -A OUTPUT -p tcp --syn -j REDIRECT --to-ports 9040
ip6tables -t nat -A OUTPUT -p tcp --syn -j REDIRECT --to-ports 9040
#allow local communication
iptables -A OUTPUT -o lo -j ACCEPT
ip6tables -A OUTPUT -o lo -j ACCEPT
iptables -A INPUT -i lo -j ACCEPT
ip6tables -A INPUT -i lo -j ACCEPT
#reject everything else
iptables -A OUTPUT -j REJECT
ip6tables -A OUTPUT -j REJECT

#uncomment to be able to directly connect with your own IP and allow no one else
#for clearnet in YOUR_IP_HERE;do(
#iptables -A INPUT -s $clearnet -j ACCEPT;
#)done
#drop everything else (uncomment after adding your own IP above)
#iptables -A INPUT -j DROP
#ip6tables -A INPUT -j DROP

exit 0