echoCTF OpenVPN UpDown

A small tool written in Go that is used by OpenVPN client-connect and client-disconnect.

The tool is reponsible for providing the following functionality

• Checks if the event is active before proceeding
• Checks if the user is already logged in
• Calls the VPN_LOGIN() / VPN_LOGOUT() procedures on the database
• Retrieves existing networks that the user is granted access
• Retrieves private instance networks that the user is granted access
• Executes pfctl to add the user VPN assigned IP to their client tables (<networkcodename_clients>)