AuthCore

AuthCore is a secure authentication mod for Fabric 1.21.1 servers. It is designed to replace unstable login systems by providing player registration, login, local SQLite storage, and BCrypt password hashing.

It is a server-side-only mod: players do not need to install it on their clients.

Features

Player account registration.
Secure login system.
Password changes.
BCrypt password hashing.
Local SQLite database.
Configurable login timeout.
Safe disconnection after the timeout expires.
ActionBar instructions and countdown.
Configurable Spanish messages.
Blocks movement, interactions, items, attacks, blocks, and damage before login.
Administrator commands.
Compatible with Fabric 1.21.1 and Java 21.

Player Commands

Command	Description
`/register <password> <confirmation>`	Creates an account and authenticates the player.
`/login <password>`	Logs into a registered account.
`/changepassword <current> <new> <confirmation>`	Changes the password of an authenticated account.

Example:

/register MySecurePassword MySecurePassword
/login MySecurePassword
/changepassword MySecurePassword AnotherSecurePassword AnotherSecurePassword

Administrator Commands

These commands require permission level 4. For now, the target player must be online.

Command	Description
`/auth reload`	Reloads the configuration and messages.
`/auth unregister <player>`	Deletes a player's account.
`/auth resetpassword <player> <password>`	Resets a player's password.
`/auth force <player>`	Forces authentication for an online player.

Configuration

On its first server start, AuthCore creates:

config/authcore.properties
config/authcore.db

authcore.properties lets you configure the login timeout and all Spanish messages. The authcore.db database stores registered accounts and their BCrypt password hashes.

Example:

login.timeout-seconds=60
messages.login-prompt=Inicia sesion con /login <contrasena>. Tiempo: {seconds}s
messages.register-prompt=Registrate con /register <contrasena> <confirmacion>. Tiempo: {seconds}s

After editing the configuration, restart the server or run:

/auth reload

Installation

Install Fabric Loader for Minecraft 1.21.1.
Install a Fabric API version compatible with 1.21.1.
Use Java 21.
Copy authcore-0.1.0.jar into the server's mods folder.
Remove any other authentication mod that may conflict with AuthCore.
Start the server.

AuthCore was built to provide a stable, secure, and extensible authentication foundation for Fabric servers.