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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-GCM with random device key)
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

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 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:
- 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 1.21.11
Fabric Loader
Fabric API
Java 21

License

MIT