ALLOWED_IP=192.168.2.2
OWN_IP=192.168.2.1
OWN_IP_WAN=192.168.1.2
OVPN_IP=178.162.194.30

iptables -F
iptables -X

iptables -P INPUT DROP
iptables -P OUTPUT DROP


iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

#### ALLOWED_IP -> OWN_IP
## Port 22
iptables -A INPUT -i eth0 -p tcp -s $ALLOWED_IP -d $OWN_IP --sport 513:65535 --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -o eth0 -p tcp -s $OWN_IP -d $ALLOWED_IP --sport 22 --dport 513:65535 -m state --state ESTABLISHED -j ACCEPT
## Port 80
iptables -A INPUT -i eth0 -p tcp -s $ALLOWED_IP -d $OWN_IP --sport 513:65535 --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -o eth0 -p tcp -s $OWN_IP -d $ALLOWED_IP --sport 80 --dport 513:65535 -m state --state ESTABLISHED -j ACCEPT
## Port 443
iptables -A INPUT -i eth0 -p tcp -s $ALLOWED_IP -d $OWN_IP --sport 513:65535 --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -o eth0 -p tcp -s $OWN_IP -d $ALLOWED_IP --sport 443 --dport 513:65535 -m state --state ESTABLISHED -j ACCEPT


#### OWN_IP -> OpenVPN Provider
## OpenVPN:
iptables -A INPUT -i eth1  -p udp -s $OVPN_IP -d $OWN_IP_WAN --sport 1149      --dport 513:65535 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -o eth1 -p udp -s $OWN_IP_WAN -d $OVPN_IP --sport 513:65535 --dport 1149      -m state --state NEW,ESTABLISHED -j ACCEPT

## Forward in den Tunnel
iptables -A FORWARD -i eth0 -o tun0 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i tun0 -o eth0 -m state --state ESTABLISHED -j ACCEPT

iptables -A FORWARD -i wlan0 -o tun0 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i tun0 -o wlan0 -m state --state ESTABLISHED -j ACCEPT

## Masqueade
iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE


## Drop everything else
iptables -A INPUT -j DROP
iptables -A OUTPUT -j DROP
iptables -A FORWARD -j DROP