mirror of
https://github.com/UNITRONIX/BetterDesk.git
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UNITRONIX
40cde4ebee
Removes browsing-topics=() directive which caused console warnings in browsers that don't support this non-standard feature. This commit was made possible thanks to Insolve.
107 lines
3.9 KiB
JavaScript
107 lines
3.9 KiB
JavaScript
/**
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* BetterDesk Console - Security Middleware
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* Configures Helmet and custom security headers
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*/
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const crypto = require('crypto');
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const helmet = require('helmet');
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const config = require('../config/config');
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/**
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* Build CSP connect-src based on HTTPS mode
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* Allow WebSocket connections (ws:// or wss:// depending on mode)
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*/
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const connectSources = config.httpsEnabled
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? ["'self'", "wss:", "https://cdn.jsdelivr.net"]
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: ["'self'", "ws:", "https://cdn.jsdelivr.net"];
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function buildHelmetMiddleware(req, res) {
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const nonce = crypto.randomBytes(16).toString('base64');
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const isRemoteViewerPage = req.path.startsWith('/remote');
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res.locals.cspNonce = nonce;
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const scriptSources = ["'self'", `'nonce-${nonce}'`, "https://cdn.jsdelivr.net"];
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if (isRemoteViewerPage) {
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// The remote viewer still depends on protobuf.js runtime code generation.
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scriptSources.push("'unsafe-eval'");
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}
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return helmet({
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contentSecurityPolicy: {
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directives: {
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defaultSrc: ["'self'"],
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scriptSrc: scriptSources,
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// Allow inline event handlers (onclick=, onchange=, etc.) used by
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// several admin panel pages. <script> tags still require nonce.
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scriptSrcAttr: ["'unsafe-inline'"],
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styleSrc: ["'self'", "'unsafe-inline'", "https://fonts.googleapis.com", "https://cdn.jsdelivr.net"],
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fontSrc: ["'self'", "https://fonts.gstatic.com"],
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imgSrc: ["'self'", "data:", "blob:"],
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mediaSrc: ["'self'", "blob:"],
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connectSrc: connectSources,
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frameSrc: ["'self'"],
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objectSrc: ["'none'"],
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childSrc: ["'self'"],
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workerSrc: ["'self'", "blob:"],
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baseUri: ["'self'"],
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formAction: ["'self'"],
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frameAncestors: ["'self'"],
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upgradeInsecureRequests: config.httpsEnabled ? [] : null
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}
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},
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crossOriginEmbedderPolicy: false,
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crossOriginResourcePolicy: { policy: 'same-origin' },
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crossOriginOpenerPolicy: config.httpsEnabled ? { policy: 'same-origin' } : false,
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originAgentCluster: config.httpsEnabled,
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strictTransportSecurity: config.httpsEnabled
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? { maxAge: 31536000, includeSubDomains: true, preload: false }
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: false,
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dnsPrefetchControl: { allow: false },
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referrerPolicy: { policy: 'strict-origin-when-cross-origin' }
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});
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}
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/**
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* Custom security headers beyond what Helmet provides
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*/
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function customSecurityHeaders(req, res, next) {
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// Prevent clickjacking (belt + suspenders with CSP frame-ancestors)
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res.setHeader('X-Frame-Options', 'SAMEORIGIN');
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// Prevent MIME type sniffing
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res.setHeader('X-Content-Type-Options', 'nosniff');
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// XSS Protection (disabled — CSP is the modern replacement)
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res.setHeader('X-XSS-Protection', '0');
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// Permissions policy — restrict powerful APIs
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// Only use standardized features; non-standard ones (browsing-topics,
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// attribution-reporting, private-state-token-*, etc.) cause console warnings.
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res.setHeader('Permissions-Policy',
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'geolocation=(), microphone=(self), camera=(), ' +
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'payment=(), usb=(), ' +
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'accelerometer=(), gyroscope=(), magnetometer=()');
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// Prevent cross-site leak via cache timing
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res.setHeader('Cache-Control', 'no-store');
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// Allow static assets to be cached (overridden in express.static options)
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if (req.path.startsWith('/css/') || req.path.startsWith('/js/') ||
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req.path.startsWith('/img/') || req.path.startsWith('/fonts/')) {
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res.setHeader('Cache-Control', 'public, max-age=3600');
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}
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next();
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}
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/**
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* Combined security middleware
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*/
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function securityMiddleware(req, res, next) {
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buildHelmetMiddleware(req, res)(req, res, () => {
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customSecurityHeaders(req, res, next);
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});
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}
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module.exports = securityMiddleware;
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