Node Guard

General purpose I/O module to add following http headers to keep your webpages securing them from malware attacks. This module can be used with any node http server.

• X-XSS-Protection
• X-Frame-Options
• X-Content-Type-Options
• X-Download-Options

X-XSS-Protection

X-XSS-Protection http header saves you from XSS attacks. node-guard will set up X-XSS-Protection header on all modern browsers and will disable it for older versions of IE as they have security vulnerabilities defined here https://technet.microsoft.com/library/security/ms10-002.

const http = require('http')
const guard = require('node-guard')
const options = {
  enabled: true,
  enableOnOldIE: false
}

http.createServer(function (req, res) {
  guard.addXssFilter(req, res, options)
  res.end()
}).listen(3000)

X-Frame-Options

X-Frame-Options defines whether your webpage can be embedded as an iframe to other website. It can take 3 different values from ALLOW-FROM, DENY and SAMEORIGIN

const http = require('http')
const guard = require('node-guard')
const options = 'DENY' // cannot be embedded at all
// or
const options = 'SAMEORIGIN' // only this website
// or
const options = 'ALLOW-FROM http://example.com' // defined uri

http.createServer(function (req, res) {
  guard.addFrameOptions(res, options)
  res.end()
}).listen(3000)

X-Content-Type-Options

X-Content-Type-Options disables sniffing from web browsers, where they will try to sniff mimetypes. Which means a web browser will execute the javascript file even if the content-type of that file is not set to javascript. Give it a read https://miki.it/blog/2014/7/8/abusing-jsonp-with-rosetta-flash/

const http = require('http')
const guard = require('node-guard')
const options = true // or false

http.createServer(function (req, res) {
  guard.addNoSniff(res, options)
  res.end()
}).listen(3000)

X-Download-Options

IE specific header to stop users from executing html files with the access to your site context. Here is a good read on same https://blogs.msdn.microsoft.com/ie/2008/07/02/ie8-security-part-v-comprehensive-protection/.

const http = require('http')
const guard = require('node-guard')
const options = true // or false

http.createServer(function (req, res) {
  guard.addNoOpen(res, options)
  res.end()
}).listen(3000)