#!/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 bind debian-tor; 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

#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
#unrestricted access to these IPs
for clearnet in 127.0.0.0/8 10.9.0.0/24; 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
#accet IPv6 ICMP packages required for SLAAC
ip6tables -A INPUT -p ipv6-icmp -j ACCEPT
ip6tables -A OUTPUT -p ipv6-icmp -j ACCEPT
#allow querriying ntp servers
iptables -t nat -A OUTPUT -p udp --dport 123 -j RETURN
iptables -A OUTPUT -p udp --dport 123 -j ACCEPT
ip6tables -t nat -A OUTPUT -p udp --dport 123 -j RETURN
ip6tables -A OUTPUT -p udp --dport 123  -j ACCEPT
#redirect all outgoing DNS querries to our dns server
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
#redirect all other TCP traffic through tor
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
#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