How to prevent PHP CSRF attacks?

How to deal with cross-site request forgery (CSRF) attacks in PHP?

With the development of the Internet, network security issues have become increasingly prominent. One of the common attack methods is cross-site request forgery (CSRF) attack. CSRF attacks take advantage of the user's identity authentication after logging into a website to perform malicious operations. This article will introduce how to deal with CSRF attacks in PHP and ensure the security of the website.

1. Using CSRF Token
   The core of a CSRF attack is to use the user's identity authentication to initiate a request without the user's knowledge. In order to prevent CSRF attacks, CSRF Token can be used. Every time the user performs a sensitive operation, a random Token is generated and the Token is embedded in the request. After receiving the request, the server verifies the validity of the Token. If the Token does not match, the request is rejected.
2. Add time limit to user identity authentication
   In order to prevent CSRF attacks from using the user's identity authentication information, you can add a time limit to the user's identity authentication information. For example, a login token is generated for the user after logging in, and the token is saved on the server side together with its identity authentication information. Every time the user performs a sensitive operation, the server will verify the validity period of the token. If the validity period exceeds, the request will be rejected.
3. Check the source of the request
   CSRF attacks take advantage of the user's identity authentication after logging in to a specific website. In order to prevent CSRF attacks, you can check whether the source of the request is legitimate on the server side. The source of the request can be verified by checking the Referer header information or using a token.
4. HTTP method to restrict sensitive operations
   CSRF attacks usually use the user's identity authentication information to perform sensitive operations, such as changing passwords, transferring funds, etc. To prevent this attack, you can restrict the HTTP methods for sensitive operations and only allow POST or other secure HTTP methods to perform sensitive operations. This prevents attackers from using images or links to perform sensitive operations.
5. Regularly update the URL or parameters of sensitive operations
   CSRF attacks usually use pre-constructed URLs or request parameters to perform malicious operations. To prevent this attack, URLs or parameters for sensitive operations can be updated regularly. For example, every time a user performs a sensitive operation, a new URL or request parameter is generated, so that the attacker cannot construct a valid request in advance.

To summarize, the main methods to deal with CSRF attacks in PHP include using CSRF Token, adding time limits to user authentication, checking the request source, restricting HTTP methods for sensitive operations, and regularly updating the URLs for sensitive operations. or parameters. By taking these security measures, you can effectively prevent CSRF attacks and ensure the security of your website.

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