PHP is a very popular website scripting language, but its inherent security is very weak. This article describes the PHP enhancement plan (Hardened-PHP project) and the new Suhosi plan. Suhosin provides enhanced PHP security configuration.
PHP is the 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, but at the same time the scripting language itself is very flexible, and it is easy to implement code using it, but these codes are bloated and unsafe, although it is In this way, it still has many users. You could assume that, time and time again, applications of all kinds exhibit this vulnerability: vulnerable to SQL injection, cross-site scripting, arbitrary execution, and more.
Because built-in PHP security measures like safe_mode and open_basedir are ignored, the PHP Enhancement Project 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.
Sohosin consists of two parts: The first part is a PHP patch. 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 installations in order to achieve security and they certainly prefer to use PHP directly on the Linux distribution system provided by the vendor, using extension modules to provide more security features that PHP itself cannot have. .
The extension is easy to install; it can also be installed via PECL, or downloaded and compiled:
$ tar xvzf suhosin-0.9.17
$ cd suhosin-0.9.17
$ phpize
$ ./configure
$ make
$ sudo make install
To use suhosin, you also need to add /etc/php.ini, as shown below:
extension=suhosin.so
For most people, the default configuration options are enough. 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 in the system log or write them to any other log files at the same time; it can also create blacklists and whitelists for each virtual host; you 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 extensions like Zend Optimizer.