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impliment middleware to prevent xss attacks #144

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Merged
smalho01 merged 4 commits into from
Dec 15, 2025
Merged

impliment middleware to prevent xss attacks #144

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c374020
impliment middleware to prevent xss attacks
smalho01 Dec 15, 2025
cf669b7
run lint
smalho01 Dec 15, 2025
01548b8
update index to not include intermediary title
smalho01 Dec 15, 2025
286a704
update title to be PIMS short hand
smalho01 Dec 15, 2025
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2 changes: 1 addition & 1 deletion frontend/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@
<meta charset="UTF-8" />
<link rel="icon" type="image/png" href="/intermediary.png" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Rems Intermediary UI</title>
<title>PIMS Pharmacy</title>
</head>
<body>
<div id="root"></div>
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40 changes: 40 additions & 0 deletions frontend/vite-xss-middleware.ts
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@@ -0,0 +1,40 @@
// vite-xss-fix.ts
import { Plugin } from 'vite';

export function viteXssMiddleware(): Plugin {
const middleware = (req: any, res: any, next: any) => {
const originalEnd = res.end;
const chunks: any[] = [];

res.end = function (chunk?: any) {
if (chunk) chunks.push(Buffer.from(chunk));

const body = Buffer.concat(chunks).toString();

// If Vite's error message is reflecting user input, replace it
if (body.includes('did you mean to visit') && body.includes('<a href=')) {
const safe = `<!DOCTYPE html>
<html>
<head><title>404 Not Found</title></head>
<body><h1>404 - Page Not Found</h1></body>
</html>`;
res.setHeader('Content-Type', 'text/html');
return originalEnd.call(res, safe);
}

return originalEnd.call(res, Buffer.concat(chunks));
};

next();
};

return {
name: 'vite-xss-fix',
configureServer(server) {
server.middlewares.use(middleware);
},
configurePreviewServer(server) {
server.middlewares.use(middleware);
}
};
}
5 changes: 2 additions & 3 deletions frontend/vite.config.ts
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@@ -1,23 +1,22 @@
import { defineConfig } from 'vite';
import react from '@vitejs/plugin-react';

import { viteXssMiddleware } from './vite-xss-middleware';
import dotenv from 'dotenv';

dotenv.config({ path: '.env' }); // load env vars from .env
export default defineConfig({
// depending on your application, base can also be "/"
base: process.env.REACT_APP_VITE_BASE || '',
plugins: [react()],
plugins: [react(), viteXssMiddleware()],
preview: {
allowedHosts: ['.mitre.org', '.elb.us-east-1.amazonaws.com'],
port: parseInt(process.env.PORT!),

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host: true
},
define: {
'process.env': process.env
},
server: {
port: parseInt(process.env.PORT!),

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open: false,
host: true,
allowedHosts: ['.mitre.org', '.elb.us-east-1.amazonaws.com']
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