Auto Login

Client-side Fabric mod that automatically logs you into authentication-based Minecraft servers (e.g. EasyAuth, AuthMe) using a locally encrypted password.

This mod runs entirely on the client and does not modify any server behavior.

Features

• Automatically sends /login <password> after joining a server
• Password is stored locally and encrypted (AES + PBKDF2)
• No server-side plugin or mod required
• Client-only, safe for multiplayer servers
• Manual trigger via command for testing or fallback

Commands

Set password (required once)

/autologin set <password>

• Encrypts and saves the password locally
• Enables auto-login automatically

Trigger auto-login immediately

/autologin login

• Executes login attempt right now
• Useful for testing or manual retry

Enable / disable

/autologin on
/autologin off
/autologin toggle

Clear saved password

/autologin clear

• Deletes stored credentials
• Disables auto-login

How It Works

1. On first setup, the password is encrypted and saved locally
2. When you join a server:
   • The mod waits until the client is fully initialized
   • Then sends the login command directly to the server
3. The password is never sent anywhere else and is not logged

The mod does not intercept packets, modify UI, or hook into server authentication logic.

Security Notes

• Passwords are stored only on your local machine
• Encryption uses:
  • PBKDF2 (key derivation)
  • AES-GCM (authenticated encryption)
• No plaintext password is written to disk
• Do not reuse important real-world passwords

Supported Versions

• Minecraft 1.21.11
• Fabric Loader
• Fabric API
• Java 21

License

MIT