Auto Login

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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.

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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

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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

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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.

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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

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Supported Versions

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

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License

MIT