MultiAuth

MultiAuth is a Forge mod allowing Minecraft servers to accept connections from multiple Yggdrasil authentication services simultaneously.

✨ Features

• Multi-Yggdrasil Support: Connect to any number of auth services (Mojang, private, etc.).
• Discovery Protocol: Instant auth-provider identification via custom network packets.
• UUID Namespacing: Deterministic UUID generation to prevent inventory collisions between providers.
• Duplicate Handling: Optional @index aliasing for users with identical names.
• Smart Caching: Remembers player auth sources to speed up login.
• Skin Validation: Full RSA signature verification for all providers.

🛠 Configuration (multiauth.json)

Located in your config/ folder.

{
    "server": [
        {
            "name": "Mojang's Session Server",
            "url": "https://sessionserver.mojang.com"
        },
        {
            "name": "Azures04's Servers",
            "url": "https://yggdrasil.azures.fr"
        }
    ],
    "cache": true,
    "allowDuplicateNames": true
}

• server: Authorized auth services (order determines @index alias).
• cache: Save successful login sources.
• allowDuplicateNames: Allow identical usernames via aliasing.