Auto Login

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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

• On first setup, the password is encrypted and saved locally
• When you join a server:

• The mod waits until the client is fully initialized
• Then sends the login command directly to the server

• 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