Securing PHP step-by-step

Tuesday, 24 June 2003, 3:44 PM EST

In my previous article ("Securing Apache: Step-by-Step") I described the method of securing the Apache web server against unauthorized access from the Internet. Thanks to the described method it was possible to achieve a high level of security, but only when static HTML pages were served. But how can one improve security when interaction with the user is necessary and the users' data must be saved into a local database?

This article shows the basic steps in securing PHP, one of the most popular scripting languages used to create dynamic web pages. In order to avoid repeating information covered in the previous article, only the main differences related to the process of securing Apache will be described.

Like in the previous article, the target operating system is FreeBSD 4.7. However, the methods presented should also apply on most modern UNIX and UNIX-like systems. This article also assumes that a MySQL database is installed on the host, and is placed in the "/usr/local/mysql" directory.

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