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Options for custom DNS and intra-VPN connectivity

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Nyr 2014-11-04 21:57:36 +01:00
parent 2174037768
commit 215140b682
1 changed files with 49 additions and 6 deletions
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55
openvpn-install.sh
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@ -114,6 +114,7 @@ if [[ -e /etc/openvpn/server.conf ]]; then
esac esac
done done
else else
clear
echo 'Welcome to this quick OpenVPN "road warrior" installer' echo 'Welcome to this quick OpenVPN "road warrior" installer'
echo "" echo ""
# OpenVPN setup and first user creation # OpenVPN setup and first user creation
@ -131,6 +132,19 @@ else
echo "This can be useful to connect under restrictive networks" echo "This can be useful to connect under restrictive networks"
read -p "Listen at port 53 [y/n]: " -e -i n ALTPORT read -p "Listen at port 53 [y/n]: " -e -i n ALTPORT
echo "" echo ""
echo "Do you want to enable internal networking for the VPN?"
echo "This can allow VPN clients to communicate between them"
read -p "Allow internal networking [y/n]: " -e -i n INTERNALNETWORK
echo ""
echo "What DNS do you want to use with the VPN?"
echo " 1) Current system resolvers"
echo " 2) OpenDNS"
echo " 3) Level 3"
echo " 4) NTT"
echo " 5) Hurricane Electric"
echo " 6) Yandex"
read -p "DNS [1-6]: " -e -i 1 DNS
echo ""
echo "Finally, tell me your name for the client cert" echo "Finally, tell me your name for the client cert"
echo "Please, use one word only, no special characters" echo "Please, use one word only, no special characters"
read -p "Client name: " -e -i client CLIENT read -p "Client name: " -e -i client CLIENT
@ -182,10 +196,34 @@ else
sed -i 's|dh dh1024.pem|dh dh2048.pem|' server.conf sed -i 's|dh dh1024.pem|dh dh2048.pem|' server.conf
sed -i 's|;push "redirect-gateway def1 bypass-dhcp"|push "redirect-gateway def1 bypass-dhcp"|' server.conf sed -i 's|;push "redirect-gateway def1 bypass-dhcp"|push "redirect-gateway def1 bypass-dhcp"|' server.conf
sed -i "s|port 1194|port $PORT|" server.conf sed -i "s|port 1194|port $PORT|" server.conf
# Obtain the resolvers from resolv.conf and use them for OpenVPN # DNS
grep -v '#' /etc/resolv.conf | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read line; do case $DNS in
sed -i "/;push \"dhcp-option DNS 208.67.220.220\"/a\push \"dhcp-option DNS $line\"" server.conf 1)
done # Obtain the resolvers from resolv.conf and use them for OpenVPN
grep -v '#' /etc/resolv.conf | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read line; do
sed -i "/;push \"dhcp-option DNS 208.67.220.220\"/a\push \"dhcp-option DNS $line\"" server.conf
done
;;
2)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 208.67.222.222"|' server.conf
sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 208.67.220.220"|' server.conf
;;
3)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 4.2.2.2"|' server.conf
sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 4.2.2.4"|' server.conf
;;
4)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 129.250.35.250"|' server.conf
sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 129.250.35.251"|' server.conf
;;
5)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 74.82.42.42"|' server.conf
;;
6)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 77.88.8.8"|' server.conf
sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 77.88.8.1"|' server.conf
;;
esac
# Listen at port 53 too if user wants that # Listen at port 53 too if user wants that
if [[ "$ALTPORT" = 'y' ]]; then if [[ "$ALTPORT" = 'y' ]]; then
iptables -t nat -A PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-port $PORT iptables -t nat -A PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-port $PORT
@ -196,8 +234,13 @@ else
# Avoid an unneeded reboot # Avoid an unneeded reboot
echo 1 > /proc/sys/net/ipv4/ip_forward echo 1 > /proc/sys/net/ipv4/ip_forward
# Set iptables # Set iptables
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP if [[ "$INTERNALNETWORK" = 'y' ]]; then
sed -i "/# By default this script does nothing./a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP" /etc/rc.local iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
sed -i "/# By default this script does nothing./a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP" /etc/rc.local
else
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP
sed -i "/# By default this script does nothing./a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP" /etc/rc.local
fi
# And finally, restart OpenVPN # And finally, restart OpenVPN
/etc/init.d/openvpn restart /etc/init.d/openvpn restart
# Try to detect a NATed connection and ask about it to potential LowEndSpirit # Try to detect a NATed connection and ask about it to potential LowEndSpirit