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Table of Contents
PHP Framework Security Guide: How to Prevent CSRF Attacks?
How does CSRF work?
How to prevent CSRF attacks?
Practical Case
Home Backend Development PHP Tutorial PHP Framework Security Guide: How to Prevent CSRF Attacks?

PHP Framework Security Guide: How to Prevent CSRF Attacks?

Jun 01, 2024 am 10:36 AM
php csrf

PHP 框架安全指南：如何防止 CSRF 攻擊？

PHP Framework Security Guide: How to Prevent CSRF Attacks?

A cross-site request forgery (CSRF) attack is a type of network attack in which an attacker tricks a user into performing unintended actions within the victim's web application.

How does CSRF work?

CSRF attacks exploit the fact that most web applications allow requests to be sent between different pages within the same domain name. The attacker creates a malicious page that sends requests to the victim's application, triggering unauthorized actions.

How to prevent CSRF attacks?

1. Use anti-CSRF tokens:

  • Assign each user a unique token and store it in the session or cookie.
  • Include a hidden field in the application for submitting this token.
  • Verify that the submitted token matches the stored token. 
// 生成令牌并存儲(chǔ)在會(huì)話(huà)中
$_SESSION['csrf_token'] = bin2hex(random_bytes(32));

// 在表單中包含隱藏字段
<input type="hidden" name="csrf_token" value="<?php echo $_SESSION['csrf_token']; ?>">

// 驗(yàn)證提交的令牌
if (!isset($_POST['csrf_token']) || $_POST['csrf_token'] !== $_SESSION['csrf_token']) {
    // 令牌無(wú)效，拒絕請(qǐng)求
}

2. Use the Synchronizer Token Pattern:

  • When the page is loaded for the first time, the token is generated and It is stored in a cookie.
  • On form submission, the token is sent to the server as an HTTP header.
  • Verify that the submitted token matches the stored token. 
// 在首次加載頁(yè)面時(shí)生成令牌并存儲(chǔ)在 Cookie 中
setcookie('csrf_token', bin2hex(random_bytes(32)), time() + 3600, '/');

// 在表單提交時(shí)，將令牌作為 HTTP 頭發(fā)送
$headers = getallheaders();
$csrf_token = $headers['X-CSRF-Token'];

// 驗(yàn)證提交的令牌
if (!isset($csrf_token) || $csrf_token !== $_COOKIE['csrf_token']) {
    // 令牌無(wú)效，拒絕請(qǐng)求
}

Practical Case

For example, preventing CSRF attacks on fund transfers in wallets: 

// 在用戶(hù)加載轉(zhuǎn)賬頁(yè)面時(shí)生成令牌
$transfer_token = bin2hex(random_bytes(32));

// 在表單中包含隱藏字段
<input type="hidden" name="transfer_token" value="<?php echo $transfer_token; ?>">

// 驗(yàn)證提交的令牌
if (!isset($_POST['transfer_token']) || $_POST['transfer_token'] !== $transfer_token) {
    // 令牌無(wú)效，拒絕轉(zhuǎn)賬請(qǐng)求
}

By implementing these measures, you can Effectively prevent CSRF attacks and protect your PHP applications.

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