A simple VPN

Note

The protocol isn't done. I am constantly improvement it and the code itself.

How to use

Start a server

obirt server

Start a client using obirt.henrybarreto.dev as server.

obirt client obirt.henrybarreto.dev

The Client

The client connects to a server, send all IP packages received by the network interface and injecting the package what was routed by the server.

sequenceDiagram
participant interface
participant client
participant server
client ->>+ server: Send client public key
server ->>+ client: Send server public key
server ->> client: Send AES key encrypted by peer public key
client ->> client: Decrypt AES key
client ->> server: Send Mac address
server ->> server: Store the client information in the server
server -->> client: Receive IP and Mask to bind
client ->>+ interface: Create network interface
interface ->>+ client: Confirm interface creation


loop Keep alive
    client ->> server: Send keep alive package
end

loop Every IP package
    par From Client
    interface ->> client: Receive the IP package
    client ->> client: Encrypt the package
    client ->> server: Send the IP package to server
    server ->> server: Look for the package's destination and sent it
    and From Server
    server ->> client: Send the IP package to client
    client ->> client: Decrypt the package
    client ->> interface: Send the IP package
    end
end

client ->> server: Close
server ->>- client: Close
client ->> interface: Close network interface
interface ->>- client: Confirm close on network interface

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The Server

The server receives all IP packages from the peers connected, and redirect it to the destination registed on it.

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