Revision as of 10:26, 11 January 2008

Access control is a way you to give your users different permissions while working on folders and files. The default setting in the config.php file gives permission to every user and permits all the options. In order to change this configuration you must firstly know the basic of the $config['AccessControl'] settings placed in the config.php file. 

The syntax of the ACL Items

The syntax of the ACL entries is as followed:

$config['AccessControl'][] = Array(
'role' => '*',
'resourceType' => '*',
'folder' => '/', 
'folderView' => true,
'folderCreate' => true,
'folderRename' => true,
'folderDelete' => true,

'fileView' => true,
'fileUpload' => true,
'fileRename' => true,
'fileDelete' => true);

Access Control List entries are defined using the following values:

• role – this attribute sets the type of the user. By default it is set to * which can be treated as "everybody". You may set this parameter to other name like user or limited_functions. The name of the user type will be directly related to the functions the user can make use of.

• resourceType – this setting defines the resources handled in CKFinder. A resource type is nothing more than a way to group files under different paths, each having different configuration settings (like Images, Flash, Files). By default it is set to * which means that all resources are available.

• folder – this setting determines where the restrictions will be used. By declaring a folder name you specify the place you want to put your restrictions on. By default it is set to /, so no folder is set.

• folder* and file* options – these variables are of Boolean type and can be set to true or false. The true setting enables an option, false disables it.

• It is possible to define numerous ACL entries. All attributes are optional. Subfolders inherit their default settings from their parents' definitions.

Example 1

If you want to restrict the upload, rename or delete of files in the "Logos" folder of the resource type "Images":

$config['AccessControl'][] = Array(
'role' => '*',
'resourceType' => 'Images',
'folder' => '/Logos', 
'fileUpload' => false,
'fileRename' => false,
'fileDelete' => false);

The above example only refers to file operations in the folder '/Logos' itself. It doesn't restrict operations on the folder so the user can delete or rename the folder. In order to limit users ability to modify the folder (not its context) you should change permissions in the parent folder.

Example 2

$config['AccessControl'][] = Array(
'role' => '*',
'resourceType' => 'Images',
'folder' => '/', 
'folderView' => true,
'folderCreate' => true,
'folderRename' => false,
'folderDelete' => false);

Now a user can view and create a folder, but he will be unable to rename or delete it. 

Sessions

In order to enable the access control options for different users you should initialize the session data by uncommenting the "session_start()" call:

session_start();

The roleSessionVar is a session variable name that CKFinder must use to retrieve the "role" of the current user.

$config['RoleSessionVar'] = 'CKFinder_UserRole';

To switch between different user roles, simply change the session variable:

$_SESSION['CKFinder_UserRole'] = "admin";

Example 3

In your config.php file you can create three different roles:

First role, every user (wildcard "*" is used):

$config['AccessControl'][] = Array(
'role' => '*',
'resourceType' => '*',
'folder' => '/', 
'folderView' => true,
'folderCreate' => false,
'folderRename' => false,
'folderDelete' => false,

'fileView' => true,
'fileUpload' => false,
'fileRename' => false,
'fileDelete' => false);

Second role, registered user:

$config['AccessControl'][] = Array(
'role' => 'registered',
'resourceType' => '*',
'folder' => '/', 
'folderView' => true,
'folderCreate' => true,
'folderRename' => false,
'folderDelete' => false,

'fileView' => true,
'fileUpload' => true,
'fileRename' => false,
'fileDelete' => false); 

Third role, admin:

$config['AccessControl'][] = Array(
'role' => 'admin',
'resourceType' => '*',
'folder' => '/', 
'folderView' => true,
'folderCreate' => true,
'folderRename' => true,
'folderDelete' => true,

'fileView' => true,
'fileUpload' => true,
'fileRename' => true,
'fileDelete' => true);  

You've created three different users permissions. The default user (everybody) is allowed to browse all files and folders. Registered user has also the ability to upload files and create folders. The administrator has full permissions.

Now let's say you have an authentication mechanism somewhere in your web application. In this file you initialize the session with session_start(); command and assign one of the pre-defined roles to the user:

$_SESSION['CKFinder_UserRole'] ='admin';

if you want to use the admin role.

$_SESSION['CKFinder_UserRole'] ='registered';

if you want to use the role assigned to registered users.

$_SESSION['CKFinder_UserRole'] = 'guest';

guest doesn't have assigned any specific permissions, so the default values are used (defined with "*")

$_SESSION['CKFinder_UserRole'] = 'any_other_value';

same situation, default values are used.