Secure shared web hosting using MAC Framework

[Miroslav Lachman]

Momchil Ivanov wrote:
[...]
>>>
>>>>- Web users and executed web scripts shouldn't be able to read other
>>>>users data
>>>>     Solution:
>>>>	run suPHP for php scripts as well as suEXEC for cgi-scripts
>>>>	implement ufs_acl so that the www (Web Server) user can access any
>>>>user directory
>>>>	Add a ufs_acl to the Web users home directory which says:
>>>>		read-write-exec only from $owner and www
>>>>	Those rights should have priority on any traditional unix file
>>>>system rights.
>>>
>>>I believe the suphp will be a amazingly slow solution as it executes
>>>php executable on each request, IIRC. Thus, the speed will not be
>>>faster then php in cgi.
>>
>>But is there any way to disbale related php functions? is there any well
>>defined configuration examples for mod_php?
> 
> 
> Is this what you are looking for: 
> http://www.php.net/manual/en/features.safe-mode.php
> 
> <snip>
> disable_functions string 
> 
> This directive allows you to disable certain functions for security reasons. 
> It takes on a comma-delimited list of function names. disable_functions is 
> not affected by Safe Mode. 
> 
> This directive must be set in php.ini For example, you cannot set this in 
> httpd.conf. 
> disable_classes string 
> 
> This directive allows you to disable certain classes for security reasons. It 
> takes on a comma-delimited list of class names. disable_classes is not 
> affected by Safe Mode. 
> 
> This directive must be set in php.ini For example, you cannot set this in 
> httpd.conf.
> </snip>
[...]

There is PHP extension for better security called Suhosin. After 
installation of this extension you have better control of what you want 
to disable, or enable.
http://www.hardened-php.net/suhosin/configuration.html
Author of this extension was developer in PHP security team.

Miroslav Lachman