OpenZiti MC

OpenZiti MC

Share a Java Edition server with friends without opening firewall holes. OpenZiti MC routes the game’s network traffic
over an OpenZiti zero-trust overlay. This means the dedicated server never needs a public IP, a
public DNS name, or an open TCP port. Connect by OpenZiti service name. The OpenZiti overlay network will then
authenticate and authorize any connections to your server before a packet ever reaches it.

What it does

• Client side: when you type an OpenZiti service name into “Add Server”, the mod intercepts the Netty dial and connects over the overlay instead of TCP.
• Server side: when enabled in config, the dedicated/integrated server binds on an OpenZiti service instead of a normal TCP listener. Only authorized identities on the overlay can reach it.

Why it works the way it does

The whole mod is three Mixins hooking Netty’s Bootstrap/ServerBootstrap calls and swapping in ZitiChannelFactory

• ZitiAddress.Dial / ZitiAddress.Bind. Minecraft’s packet pipeline is untouched. The OpenZiti JVM SDK is bundled

in the jar, so no extra installs.
Identities are loaded from a standard OpenZiti identity file in config/openziti/identity.json. Drop yours in, you
are done.

Requirements

• Java Edition 1.20.1
• Fabric Loader 0.16.10+
• Fabric API
• Architectury API
• A running OpenZiti controller and at least one edge router. If you don’t have an OpenZiti overlay, set one up by following a get-started guide.

OpenZiti Setup

The repo includes a setup-ziti.ps1 script that does all of this interactively and is the recommended way to set up
the OpenZiti overlay.

• create a service (openziti-mc by default)
• one identity tagged #minecraft-server for the dedicated server, plus one or more identities tagged #minecraft-clients for each player
• create the matching Bind/Dial service policies

Server Setup

Ensure the server identity is enrolled and drop the enrolled server .json into config/openziti/identity.json, then
set "serverBind": { "enabled": true, "serviceName": "openziti-mc" } in the config/openziti.json file.

Client Setup

For each client running the OpenZiti MC mod, ensure the client identity is enrolled and then drop the enrolled client
identity into config/openziti/identity.json.

Using the Mod

After starting Minecraft, choose: Multiplayer -> Add Server -> Server Address openziti-mc -> Done -> Join.

Additional Information

For additional information or more details see the project’s main page on GitHub at
https://github.com/dovholuknf/openziti-mc/. There you’ll find a full step-by-step (controller + identities +
policies + dev runs) guide as well in the SETUP.md.

Limitations

• This release targets MC 1.20.1 only. NeoForge support is planned for a future MC bump.
• The OpenZiti SDK and Kotlin standard library are bundled, so the jar is around 28 MB. Larger than most utility mods, smaller than most content mods.
• Annotation-processor warnings about Netty mapping targets are cosmetic; they do not affect runtime behavior.

Architecture

For a technical deep-dive (Netty channel-factory hook, the smuggler InetSocketAddress pattern, the three Mixin classes, the ZitiContext warmup wait, the dial-retry loop) see
BLOG.md in the repo.

Credits

• openziti/ziti — the OpenZiti overlay network
• openziti/ziti-sdk-jvm — the SDK whose ziti-netty module made this a small mod instead of a large one.
• vgskye/e4mc-minecraft-architectury — the smuggler-InetSocketAddress pattern and the Mixin shapes for Connection / ServerConnectionListener.

Apache-2.0 licensed. Source at github.com/dovholuknf/openziti-mc.