Example of enterprise web defenses

Throughout this book, we will build a secure design for an event ticketing system. Envision a software system that allows a box office or a website to sell tickets to a famous musical concert or theatre event. In the previous chapter, we covered code that will properly validate and sanitize input, which is the best defense against XSS. The next chapter will look at code to defend against SQL injection.

To defend against CSRF attacks in PHP, you can use anti-CSRF tokens. Here’s a simple example of how to implement CSRF protection using tokens:

• Generate a CSRF token on the server side and include it in the form.
• Verify the token when processing the form submission.

Here’s the example PHP code:

<?php
session_start();
session_regenerate_id();
function generateCSRFToken() {
    $token = bin2hex(random_bytes(32)); // Generate a random token
    $_SESSION['csrf_token&apos...