How to strengthen the security of PHP language websites

Use Suhosin to strengthen the security of PHP scripting language

PHP is a very popular website scripting language, but its inherent security is very weak. PHP enhancement plan (Hardened-PHP project) and the new Suhosi plan, Suhosin provides enhanced PHP security configuration.

PHP is a controversial but most popular website scripting language. It is popular because of its low price. However, this low price has led to more and more website applications written in PHP, and at the same time, more and more PHP itself is exposed in terms of security vulnerabilities. This kind of The security features show that PHP is extremely unreliable. (Recommended learning: PHP video tutorial)

But at the same time, this scripting language itself is very flexible, and you can easily implement the code using it, but The code is bloated and insecure, but it still has many users.

You can assume based on the actual situation, time and time again, various application software has demonstrated this vulnerability: vulnerable to SQL injection, cross-site scripting, arbitrary execution of instructions, and so on.

Because built-in PHP security measures like safe_mode and open_basedir will be ignored, the PHP Enhancement Plan creates PHP that is more secure and also performs validation checks on PHP.

Initially, these were accomplished with enhanced PHP patches that required PHP itself to be patched and recompiled. Recently, the PHP Enhancement Project released a new project called Suhosin.

Suhosin is a protection system for PHP programs. It is designed to protect servers and users from known and unknown flaws in PHP programs and PHP core.

Sohosin consists of two parts: The first part is a patch for PHP. This patch strengthens the Zend engine itself to avoid possible buffer overflows and prevent related weaknesses. The second part is the extension of Suhosin, which is a stand-alone module for PHP. The two parts can work together, or the extension can work independently.

Developers do not want to have to maintain their own PHP installation settings for security reasons and they certainly prefer to use PHP directly on the Linux distribution system provided by the vendor, using extension modules to provide more There are many security features that PHP itself cannot have.

The extension module is easy to install; it can also be installed through PECL, or compiled and installed after downloading:

    $ tar xvzf suhosin-0.9.17
　　$ cd suhosin-0.9.17
　　$ phpize
　　$ ./configure
　　$ make
　　$ sudo make install

In order to use suhosin, you also need to add /etc/ php.ini, as shown below:

extension=suhosin.so

The default configuration options are sufficient for most people. In order to strengthen the settings, you can add the corresponding values ​​​​in /etc/php.ini. The various configuration options are introduced in detail on the website. These instructions can help you with initial configuration.

Using Suhosin, you can get some error logs. You can put these logs into the system log or write them to any other log files at the same time; it can also create blacklists for each virtual host. Lists and whitelists; can filter GET and POST requests, file uploads, and cookies. You can also send encrypted sessions and cookies, set up storage that cannot be sent, and more.

Unlike the original PHP hardening patch, Suhosin is compatible with third-party extension software like Zend Optimizer.

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