require-vpn

FireFox plugin to require an existing VPN connection before accessing specified hosts.

Install from Mozilla's official MarketPlace: https://addons.mozilla.org/addon/require-vpn

Example

Let's say you have a website with a sensitive data (your bank account, work project, password store, etc) that you don't want to accidentally access with an untrusted network.

This used to happen quite often with my frequent bussiness trips:

• I have some existing open tabs with my private data
• Then I connect to a public wifi on a train or in a bar
• My data could have been leaked
• Then I remember that I have to activate my VPN :)

To fight this problem you can use require-vpn plugin. Here's how it works:

• It creates a request about your current IP to some IP_CHECKER_URL
• If your IP matches your VPN_IP, you are good to go and visit BLOCKED_HOSTS
• If not, you would be redirected to PROXY_URI (or if it is not available, the request won't make it to the original server and will be just blocked)

Configuration

• VPN_IP - your VPN IP, which is expected; can be a new-line separated list of IPs. Can also contain IP masks like 192.168.* which will match any IPs starting with 192.168.
• BLOCKED_HOSTS - a new-line separated list with hostnames of blocked resources, default: ['example.com']
• IP_CHECKER_URL - a URL to any service that will receive a GET request and return your API in plain text, default: https://icanhazip.com
• PROXY_URI - a URI for your proxy server to where a redirect will be made, see here what formats are supported, default: http://localhost:63555

Contributing

At the moment PRs are not expected. It works for me. If you use Chrome, Opera, etc - then you can test this plugin and report if it is supported.