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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
