JRSecurity — Secure, mod list verification

JRSecurity is a lightweight security stack consisting of a Fabric client mod and a Paper/Spigot plugin. It securely transmits a player’s installed mod list to supported servers using Minecraft’s modern 1.20.5+ Custom Payload system, enabling fair‑play verification without invasive scanning or gameplay impact.

It requires Client Mod (Fabric) and Server Plugin (Spighot, Paper, Bukkit)!

🖥️ Client (Fabric 1.20.5+)

• The client sends your installed mod list to the server right after joining via the Mojang 1.20.5+ payload API. Transmission is robust and version‑safe, built to work alongside vanilla‑like networking. Features

• Sends a cleaned, canonical mod and resourcepack list after a successful join Uses the modern Mojang Custom Payload / PacketCodec (1.20.5+) Zero gameplay changes, low overhead Designed to interoperate with the JRSecurity server plugin

Compatibility

Minecraft: 1.20.5 – 1.21.x Loader: Fabric Java: 17+

Installation

1. Install Fabric Loader + Fabric API
2. Drop JRSecurity (client mod) into your mods/ folder
3. Join a server running the JRSecurity plugin—your mod list is sent automatically

🖧 Server Plugin (Paper/Spigot/Bukkit)

The plugin receives the client’s mod list over a namespaced plugin messaging channel , cleans and validates it against your configurable blacklist, writes per‑join log files, and can deny access when forbidden mods are detected. Features

Blacklist enforcement via config.yml (exact IDs + substring contains); violators are kicked with a customizable message Per‑join logs in plugins/JRSecurity/joinlogs/… (cleaned, sorted lists) Smart separation of “relevant mods” vs libraries/APIs for clarity

Commands

/modcheck show [player] – show cleaned mod list (self or others; others require modcheck.admin)

/modcheck last [player] – show the path of the latest saved log file

/modcheck reload – reloads config.yml

/rpcheck show [player] – show cleaned mod list (self or others; others require modcheck.admin)

/rpcheck last [player] – show the path of the latest saved log file

/rpcheck reload – reloads config.yml

Resilient to proxies (recognizes probes, has safe fallbacks) No NMS; wide version compatibility

Compatibility

Servers: Paper/Spigot/Bukkit 1.13 – 1.21.x Java: 17+ recommended

Quick Setup

Put the JRSecurity plugin jar into plugins/ and start the server Adjust plugins/JRSecurity/config.yml as needed