storvik / killvpn

VPN kill switch written in Go

killvpn - VPN kill switch toggler written in Go

VPN kill switch that aims to prevent network traffic through anything other than specified interface. Tested on Ubuntu 17.10 using Mullvad VPN. Inspiration and approach.

This VPN kill switch was not created by a security expert, nor can I guarnantee no leakage of anything. Use at own risk!

Usage

To run program, use killvpn --config /path/to/config.json enable/disable.

Installation

Download, make build, move to desired location.

Systemd

It's possible to have this run at boot etc. using systemd. A systemd service file can be seen in systemd/killvpn.service.

Configurations

See killvpn.json for configuration example.

• VPNhosts is an array with hostnames and ports.
• VPNdevice is the network device to be used with VPN. Check ifconfig.
• NetworkDevices is an array of network devices. Ex, eth0 for LAN and wlan0 for WLAN. Check ifconfig.
• LocalNetworks is an array of local area networks that should work. Can be an IP address or IP/subnet mask.
• VPNapps lists all apps that are NOT suppose to be running without VPN.
• Verbose true / false.