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Auto Login

A 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-GCM with random device key)
• No server-side plugin or mod required
• Client-only and suitable for multiplayer servers
• Manual command trigger for testing or fallback use

Commands

Set password (required once)

/autologin set <password>

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

Trigger auto-login immediately

/autologin login

• Runs a login attempt immediately
• Useful for testing or manual retries

Enable / disable

/autologin on
/autologin off

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

1. The password is never sent anywhere else and is never 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:
  • Random 256-bit device key (generated per installation, not derivable from public info)
  • AES-GCM (authenticated encryption)
• The encryption key is stored in a separate file from the config
• No plaintext password is written to disk
• Do not reuse important real-world passwords

Supported Versions

• Minecraft 26.1.2
• Fabric Loader 0.19.2+
• Fabric API 0.150.0+
• Java 25

License

MIT