Fix codeQL issues reported

samples/functions/csharp/aadchat/negotiate.cs

@@ -44,7 +44,7 @@ public static async Task<IActionResult> Run(
             }
             else
             {
-                log.LogWarning("No x-ms-client-principal-name: " + req.Headers);
+                log.LogWarning("No x-ms-client-principal-name found in request headers.");
                 return new UnauthorizedResult();
             }
         }

samples/javascript/scoreboard/src/server/app.ts

@@ -69,10 +69,6 @@ app.set('port', port)
 app.use(express.static(staticRoot))
 app.use(handler.getMiddleware())
 
-app.get('/', function (req, res) {
-    res.sendFile(path.join(path.join(staticRoot, '/index.html')))
-})
-
 // return negotiate response to redirect websocket client to Azure Web PubSub service
 app.get('/negotiate', async (req, res) => {
     const userId = req.query.id as string

samples/javascript/whiteboard/server.js

@@ -74,10 +74,15 @@ app
     });
   })
   .post('/background/upload', async (req, res) => {
+    const file = req.files['file'];
+    const allowedMimeTypes = ['image/jpeg', 'image/png', 'image/gif'];
+    if (!allowedMimeTypes.includes(file.mimetype)) {
+      return res.status(400).send('Invalid file type.');
+    }
     diagram.background = {
       id: Math.random().toString(36).substr(2, 8),
-      data: req.files['file'].data,
-      contentType: req.files['file'].mimetype
+      data: file.data,
+      contentType: file.mimetype
     };
     await serviceClient.sendToAll({
       name: 'updateBackground',
@@ -87,6 +92,7 @@ app
   })
   .get('/background/:id', (req, res) => {
     if (diagram.background && diagram.background.id === req.params.id) {
+      res.setHeader('Content-Disposition', 'attachment; filename="background"');
       res.type(diagram.background.contentType);
       res.send(diagram.background.data);
     } else res.status(404).end();

samples/python/chatapp-microsoft-entra-id/server.py

@@ -38,7 +38,7 @@ def handle_event():
     elif request.method == 'POST':
         user_id = request.headers.get('ce-userid')
         if request.headers.get('ce-type') == 'azure.webpubsub.sys.connected':
-            return user_id + ' connected', 200
+            return 'connected', 200
         elif request.headers.get('ce-type') == 'azure.webpubsub.user.message':
             service.send_to_all(content_type="application/json", message={
                 'from': user_id,

samples/python/chatapp/server.py

@@ -1,6 +1,7 @@
 import os
 import sys
 import json
+import html
 
 from flask import (
     Flask, 
@@ -53,13 +54,13 @@ def handle_event():
             id_element = query.get('id')
             user_id = id_element[0] if id_element else None
             if user_id:
-                return {'userId': user_id}, 200
+                return {'userId': html.escape(user_id)}, 200
             return 'missing user id', 401
         elif type == 'azure.webpubsub.sys.connected':
-            return user_id + ' connected', 200
+            return 'connected', 200
         elif type == 'azure.webpubsub.user.message':
             service.send_to_all(content_type="application/json", message={
-                'from': user_id,
+                'from': html.escape(user_id),
                 'message': request.data.decode('UTF-8')
             })
             return Response(status=204, content_type='text/plain')

sdk/server-proxies/src/utils.ts

@@ -1,6 +1,7 @@
 import { AbortSignalLike } from "@azure/abort-controller";
 import { AzureKeyCredential } from "@azure/core-auth";
 import { URL } from "url";
+import { randomBytes } from "crypto";
 
 interface ParsedConnectionString {
   credential: AzureKeyCredential;
@@ -49,7 +50,7 @@ export class PromiseCompletionSource<T> {
 export class Guid {
   public static newGuid(): string {
     return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, function (c) {
-      const r = (Math.random() * 16) | 0;
+      const r = randomBytes(1)[0] % 16;
       const v = c === "x" ? r : (r & 0x3) | 0x8;
       return v.toString(16);
     });

sdk/webpubsub-socketio-extension/examples/chat-with-auth-passport/index.js

@@ -4,6 +4,7 @@ const session = require("express-session");
 const bodyParser = require("body-parser");
 const passport = require("passport");
 const LocalStrategy = require("passport-local").Strategy;
+const RateLimit = require('express-rate-limit');
 const { useAzureSocketIO, negotiate, usePassport, restorePassport } = require("@azure/web-pubsub-socket.io");
 const wrap = middleware => (socket, next) => middleware(socket.request, {}, next);
 
@@ -17,6 +18,11 @@ app.use(bodyParser.urlencoded({ extended: false }));
 app.use(passport.initialize());
 app.use(passport.session());
 
+const limiter = RateLimit({
+  windowMs: 15 * 60 * 1000, // 15 minutes
+  max: 100, // max 100 requests per windowMs
+});
+
 const USERS = [
   { id: 0, username: "john", password: "doe", age: 18 }
 ];
@@ -33,7 +39,7 @@ passport.use(
   })
 );
 
-app.get("/", (req, res) => {
+app.get("/", limiter, (req, res) => {
   const isAuthenticated = !!req.user;
   if (isAuthenticated) {
     console.log(`user is authenticated, session is ${req.session.id}`);

sdk/webpubsub-socketio-extension/examples/chat-with-auth-passport/package.json

@@ -11,7 +11,8 @@
         "express": "~4.17.1",
         "express-session": "^1.17.3",
         "passport": "^0.6.0",
-        "passport-local": "^1.0.0"
+        "passport-local": "^1.0.0",
+        "express-rate-limit": "^7.4.1"
     },
     "scripts": {
         "start": "node index.js"