fix: Implement CSRF protection for Trinity Console

CRITICAL SECURITY FIX - Prevents Cross-Site Request Forgery attacks

Changes:
- Installed csurf middleware (session-based tokens)
- Added CSRF middleware to all /admin routes in src/index.js
- Configured admin router to pass csrfToken to all views
- Updated layout.ejs to send CSRF token with htmx requests
- Added EJS view engine configuration
- Added body parsing middleware (json + urlencoded)

Security Impact:
- Prevents malicious sites from executing admin actions using cookies
- All POST requests now require valid CSRF token
- Invalid tokens return 403 Forbidden
- Session-based tokens (no cookies needed)

Protected Routes:
- /admin/servers/:id/sync (force whitelist sync)
- /admin/servers/:id/toggle-whitelist (whitelist toggle)
- /admin/grace/:id/extend (grace period extension)
- /admin/grace/:id/manual (manual payment override)
- /admin/roles/resync/:id (role assignment)

Attack Scenario Prevented:
User visits malicious site while logged into Trinity Console
→ Site tries to submit form to admin endpoint
→ Request includes session cookie but NO CSRF token
→ Server rejects with 403 Forbidden
→ Attack failed!

Note: csurf is deprecated but still functional. For future refactor,
consider csrf-csrf or Express 5 built-in protection.

Refs: TRINITY-CONSOLE-PRE-LAUNCH-CHECKLIST.md - Fix #1
Chronicler: #51

Signed-off-by: Claude (Chronicler #51) <claude@firefrostgaming.com>

services/arbiter-3.0/package.json

@@ -10,6 +10,7 @@
   "dependencies": {
     "body-parser": "^1.20.2",
     "cookie-parser": "^1.4.7",
+    "csurf": "^1.11.0",
     "discord.js": "^14.14.1",
     "dotenv": "^16.4.5",
     "ejs": "^3.1.9",

services/arbiter-3.0/src/index.js

@@ -4,6 +4,7 @@ const session = require('express-session');
 const passport = require('passport');
 const DiscordStrategy = require('passport-discord').Strategy;
 const { Client, GatewayIntentBits, REST, Routes } = require('discord.js');
+const csrf = require('csurf');
 
 const authRoutes = require('./routes/auth');
 const adminRoutes = require('./routes/admin');
@@ -32,6 +33,12 @@ passport.use(new DiscordStrategy({
 // Initialize Express App
 const app = express();
 app.set('trust proxy', 1);
+app.set('view engine', 'ejs');
+app.set('views', __dirname + '/views');
+
+// Body parsing middleware
+app.use(express.json());
+app.use(express.urlencoded({ extended: true }));
 
 // Make Discord client accessible to routes
 app.locals.client = client;
@@ -57,9 +64,12 @@ app.get('/health', (req, res) => {
     });
 });
 
+// CSRF Protection (session-based)
+const csrfProtection = csrf({ cookie: false });
+
 // Register Routes
 app.use('/auth', authRoutes);
-app.use('/admin', adminRoutes);
+app.use('/admin', csrfProtection, adminRoutes);
 app.use('/webhook', webhookRoutes);
 
 // Start Application

services/arbiter-3.0/src/routes/admin/index.js

@@ -12,6 +12,12 @@ const rolesRouter = require('./roles');
 
 router.use(requireTrinityAccess);
 
+// Make CSRF token available to all admin views
+router.use((req, res, next) => {
+    res.locals.csrfToken = req.csrfToken();
+    next();
+});
+
 router.get('/', (req, res) => {
     res.redirect('/admin/dashboard');
 });

services/arbiter-3.0/src/views/layout.ejs

@@ -6,6 +6,12 @@
     <title><%= title %> | Trinity Console</title>
     <script src="https://cdn.tailwindcss.com"></script>
     <script src="https://unpkg.com/htmx.org@1.9.11"></script>
+    <script>
+        // Configure htmx to include CSRF token in all requests
+        document.body.addEventListener('htmx:configRequest', function(evt) {
+            evt.detail.headers['CSRF-Token'] = '<%= csrfToken %>';
+        });
+    </script>
     <script>
         tailwind.config = {
             darkMode: 'class',