Beast Attack in Restify (Javascript)

To mitigate BEAST risk in a Restify API, the primary fix is to disable TLS 1.0 and prefer modern cipher suites that avoid CBC mode vulnerabilities. This is configured at the Node.js TLS layer, not within Restify logic directly. Below is a syntactically correct example showing how to create a secure HTTPS server for a Restify API.

const restify = require('restify');
const https = require('https');
const fs = require('fs');

// Load SSL/TLS credentials
const options = {
  key: fs.readFileSync('server.key'),
  cert: fs.readFileSync('server.crt'),
  // Enforce TLS 1.2 or higher
  minVersion: 'TLSv1.2',
  // Prefer cipher suites that are not vulnerable to BEAST (e.g., GCM suites)
  ciphers: 'TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_GCM_SHA256',
  // Disable CBC mode ciphers in TLS 1.0/1.1 (though minVersion already blocks them)
  honorCipherOrder: true
};

// Create Restify server
const server = restify.createServer({
  name: 'secure-api',
  version: '1.0.0'
});

// Wrap Restify server with HTTPS
const httpsServer = https.createServer(options, server);

// Middleware
server.use(restify.plugins.bodyParser());
server.use(restify.plugins.queryParser());

// Example endpoint
server.get('/api/data', (req, res, next) => {
  res.send({ message: 'Secure API response' });
  return next();
});

// Start HTTPS server
const PORT = 8443;
httpsServer.listen(PORT, () => {
  console.log(`Secure Restify API listening on https://localhost:${PORT}`);
});

// Graceful shutdown
process.on('SIGINT', () => {
  httpsServer.close(() => {
    console.log('HTTPS server closed');
    process.exit(0);
  });
});

This configuration ensures that:

• TLS versions below 1.2 are rejected (minVersion: 'TLSv1.2')
• Only modern, AEAD-based cipher suites (like GCM or ChaCha20-Poly1305) are permitted
• The server honors the cipher order to prevent downgrade attempts

Note that Restify itself does not handle TLS — it relies on the underlying Node.js https module. Therefore, securing the API requires proper TLS configuration at the server creation level, as shown. middleBrick validates these settings during scanning and will report if TLS 1.0 or weak ciphers are enabled, helping teams enforce transport security without requiring agents or configuration changes to the API code.