VeloAuth

Complete authentication plugin for Velocity proxy with auto-login for premium players and secure registration/login for offline players.

What is VeloAuth?

VeloAuth handles all player authentication directly on your Velocity proxy, working together with PicoLimbo (or a similar limbo server) to manage login and registration before players reach your backend servers. Premium players are automatically logged in, while offline players use simple /register and /login commands.

Features

• ✅ Auto-login for premium players – Mojang account owners skip login automatically
• ✅ Secure offline player auth – Registration and login with BCrypt password hashing
• ✅ Authorization cache – Logged-in players reconnect instantly without re-entering passwords
• ✅ Brute-force protection – Automatic blocking after too many failed attempts
• ✅ Multi-database support – Works with MySQL, PostgreSQL, H2, and SQLite
• ✅ LimboAuth compatible – Migrate from LimboAuth without losing player accounts

Requirements

• Java 21 or newer
• Velocity proxy (API 3.4.0+)
• PicoLimbo or other limbo/lobby server
• Database: MySQL, PostgreSQL, H2, or SQLite

Quick Setup

Installation

1. Download VeloAuth-1.0.0.jar from the releases page
2. Place the file in your Velocity plugins/ folder
3. Start Velocity – the plugin will create a config.yml file
4. Stop Velocity and configure your database and limbo name in plugins/VeloAuth/config.yml
5. Restart Velocity

Velocity Config

Make sure your velocity.toml includes PicoLimbo as the lobby server:

Database Config

Supported: H2, MYSQL, POSTGRESQL, SQLITE

Player Commands

Command	Description
/register <password> <password>	Create a new account
/login <password>	Login to your account
/changepassword <old> <new>	Change your password

Admin Commands

Command	Permission	Description
/unregister <nickname>	veloauth.admin	Remove a player's account
/vauth reload	veloauth.admin	Reload the configuration
/vauth cache-reset [player]	veloauth.admin	Clear authorization cache
/vauth stats	veloauth.admin	Show plugin statistics

How It Works

1. Player connects to Velocity
2. VeloAuth checks if they're already logged in (cached)
3. If not cached, player is sent to PicoLimbo
4. Player types /login or /register
5. VeloAuth verifies the password
6. If correct, player is sent to backend server

LimboAuth Migration

VeloAuth is 100% compatible with LimboAuth databases:

1. Stop LimboAuth on your backend servers
2. Install VeloAuth on Velocity
3. Configure VeloAuth to use the same database as LimboAuth
4. Start Velocity – all existing accounts will work automatically

Support

Need help? Found a bug? Open an issue on GitHub or contact the developer.