Sol's AuthLogin System

Overview

Sol’s AuthLogin is a powerful and secure authentication system designed for Minecraft servers, now upgraded with a modern token-based auto-login system for improved security and player experience.

Note: Required to install into server/mods folder and is recommended to be installed on client-side as well for auto-login feature & stable authstate restrictions.

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🔐 Key Features

🆕 Secure Token-Based Auto-Login

• Replaces outdated IP-based sessions with a secure token authentication system
• Players receive a unique login token after /login or /register
• Enables safe and seamless auto-login on future joins
• Falls back to manual login if client mod is not installed

✔ Requires mod on both client & server for full functionality

🔑 Core Authentication System

• /register <password> <confirm> — Create a new account
• /login <password> — Authenticate returning players
• /change_password <old> <new> <confirm> — Update credentials securely

🛡 Advanced Security Features

• SHA-256 password hashing with per-user unique salt
• Rate limiting to prevent brute-force login attempts
• Temporary account lockout after failed attempts (configurable)
• Multiple session prevention (one account = one player)
• Optional session caching fallback for compatibility

🚫 Strict Pre-Authentication Protection

Until a player is authenticated, they are fully restricted:

• No movement (frozen state)
• No block breaking or placing
• No inventory or container access
• No item pickup
• No combat interaction
• No chat (except auth commands)
• No command usage (except /login & /register)
• Perspective switching is blocked

⏱ Smart Timeout System

• Configurable login timeout with auto-kick
• Grace period before teleporting after login
• Action bar + title reminders at configurable intervals

📍 Spawn & Return System

• Optional spawn teleport on join
• Automatically returns players to their original position after login
• Crash-safe position persistence
• Supports world spawn or custom coordinates

🧩 Admin Commands (/auth_admin)

• reload — Reload configuration
• resetpassword <player> <newPassword> — Reset player password
• unregister <player> — Remove player account
• forcelogin <player> — Authenticate player manually
• forcelogout <player> — De-authenticate player
• info <player> — View auth status
• list — List all registered players

⚙ Highly Configurable

• Authentication timeout & session settings
• Password rules (length, complexity, requirements)
• Fully customizable messages
• Flexible spawn/teleport behavior

🎯 Who Is This For?

✅ Ideal for Offline-Mode (Cracked) Servers

• No Mojang authentication → anyone can use any username
• Prevents account impersonation and griefing
• Ensures only registered users can access their accounts
• Essential for protecting player progress and data

⚠ On Online-Mode Servers

• Mojang already verifies player identity and UUID
• No risk of impersonation
• Using this mod may cause double authentication (Mojang + mod)

👉 Still usable, but generally redundant unless extra security layers are needed

🚀 Why Choose Sol’s AuthLogin?

• Strong protection against common exploits
• Smooth player experience with auto-login
• Built for stability, configurability, and real server environments