Explain in simple terms and defeat the enemy with one move: The magic weapon to prevent PHP cross-site request forgery (CSRF)

php editor Banana provides you with an in-depth analysis of PHP cross-site request forgery (CSRF) attacks and brings you the most practical prevention techniques. In network security, CSRF attacks are a common way to use user identity information to disguise requests and cause harm. This article will introduce in detail the principles, hazards and prevention methods to help you fully understand and effectively prevent this safety hazard. Explain in simple terms and defeat the enemy with one move, allowing you to easily deal with CSRF attacks and ensure website security.

CSRF Token is a special token that is generated concurrently by the server and sent to the client. The client stores the token in a cookie. When a user sends a request to the server, the server will check whether the request contains the CSRF Token. If it does, the request is legitimate. Otherwise, the server rejects the request.

<?PHP
// 生成CSRF Token
$csrf_token = bin2hex(random_bytes(32));

// 将CSRF Token存储在Cookie中
setcookie("csrf_token", $csrf_token, time() + 3600, "/");

// 验证CSRF Token
if (isset($_POST["csrf_token"]) && $_POST["csrf_token"] === $_COOKIE["csrf_token"]) {
// 执行操作
} else {
// 拒绝请求
}
?>

In addition to using CSRF Token, developers can also take other measures to defend against cross-site request forgery attacks, such as:

• Use the SameSite attribute. The SameSite attribute can limit the scope of cookies and prevent cross-domain request forgery attacks.
• Use Strict Transport Security (HSTS) header. The HSTS header can force the browser to only use the https protocol to access the website to prevent man-in-the-middle attacks.
• Use Content Security Policy (CSP) header. The CSP header can restrict the browser from loading resources from other domain names to prevent cross-site scripting attacks.

By taking these measures, developers can effectively defend against cross-site request forgery attacks and ensure the security of web applications.

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