[TYPO3-core] RFC #11386: t3lib_cache_backend_FileBacked violates open_basedir_restrictions

[Rupert Germann]

Hi,

this is a SVN patch request.

Type: Bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=11386

Branches: Trunk

Problem:
function t3lib_cache_backend_FileBacked::set() violates 
open_basedir_restrictions due to the fact that it tries to travers the 
cacheEntryPath from the very beginning using t3lib_div::mkdir_deep. 
Mkdir checks every part of the whole path for existens (is_dir) which 
obviosly fails when open_basedir restrictions take place.

Solution:
Detect open_basedir settings and change the internal vars for 
"destination" ($this->root) and "directory to be written" 
($this->cacheDirectory) according to the open_basedir restrictions if 
they are set.

The patch also introduces a new exception which is thrown when the 
configured cache directory is not in "open_basedir".


patch was tested with PHP 5.2 and PHP 5.3 under Linux and Windows, with 
"open_basedir" in php.ini set and not set and with absolute and relative 
paths for the cache. And also with pathes with blakslashes and normal 
slashes under Windows.

My test configuration:

$TYPO3_CONF_VARS['SYS']['useCachingFramework'] = '1';

$options = array();

### Linux (open_basedir set to /srv/www)
// $options = array('cacheDirectory' => '/srv/www/cftemp/');

### Windows (open_basedir set to C:\xampp\xampp\htdocs\typo3)
// $options = array('cacheDirectory' => 
'C:\xampp\xampp\htdocs\typo3\cache');

$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['cache_pages']['backend'] 
= 't3lib_cache_backend_FileBackend';
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['cache_pages']['options'] 
= $options;




greets
rupert
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