How to prevent clickjacking attacks in PHP language development?

With the development of the Internet and the popularization of applications, clickjacking attacks are appearing more and more frequently, becoming one of the main issues affecting Internet security. PHP is a commonly used Internet development language. How to prevent clickjacking attacks in the development of PHP language?

Clickjacking attack means that the attacker embeds malicious code to trick the user into secretly clicking on a suspicious link without being seen, and then obtains the user's private information and other sensitive information. In order to prevent this kind of attack, the following measures can be taken in application development:

1. Prohibit page framing

Page framing means embedding the attacked page into In the frame of a third-party site, users cannot tell the source of the frame at this time, and may be subject to phishing attacks at worst, or lose private information at worst. Developers can disable page framing by adding X-FRAME-OPTIONS to the HTTP response header. X-FRAME-OPTIONS is an extension of the HTTP response header that sets options that prevent third-party sites from embedding application pages via iframes. In the PHP code, the code to prohibit page framing is as follows:

header('X-Frame-Options:SAMEORIGIN');

In the above code, the X-FRAME-OPTIONS header is set The SAMESITE means that page framing is only allowed under the same site.

2. Add random verification

Generate random verification tokens for users when performing user operations, so that attackers cannot simulate the user's operations under unknown circumstances. own attack purpose. In PHP, you can generate a token by using session. The sample code is as follows:

session_start();
$_SESSION['token'] = md5(time());
echo "Token value :".$_SESSION['token'];

In the above code, use session to set a randomly generated token and then pass it to the front-end page. When the user performs an operation, the token value needs to be submitted together, and the background determines whether the token is valid and matching. Once it is submitted repeatedly or expires, it can be intercepted immediately.

3. Detecting Referrer information

Attackers use Referrer hijacking to connect resources on the website to conduct illegal activities. Therefore, defense based on Referrer information is also a relatively effective method. In PHP, you can obtain the current referer information through $_SERVER[‘HTTP_REFERRER’] and compare it with the referer of normal requests. When the referer information is inconsistent with the request source, it can be judged as an illegal request and refused to be processed. The sample code is as follows:

if($_SERVER['HTTP_REFERRER'] != 'http://www.example.com'){

die(‘非法访问’);

}

In short, For PHP language application development, security is one of the factors that must be considered. Developers can effectively prevent clickjacking attacks by limiting page framing, adding random verification, and detecting referrer information.

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