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Suppose you are using the public file download method and you have file uploads enabled. What will happen when someone uploads a file named bad_exploit.php Will it run when the attacker hits http://example.com/sites/default/files/bad_exploit.php Hopefully not, for three reasons. The first is that .php should never be in the list of allowed extensions for uploaded files. The second is the .htaccess file, which should be in sites/default/files/ .htaccess (see 20). However, in several common Apache configurations, uploading the file exploit.php.txt may result in code execution of the file as PHP code (see http:// drupal.org/files/sa-2006-007/advisory.txt). That brings us to the third reason: file name munging to render the file harmless. As a defense against uploaded executable files, the following function is used. file_munge_filename($filename, $extensions, $alerts = TRUE) The $filename parameter is the name of the file to modify. The $extensions parameter is a space-separated string containing file extensions. The $alerts parameter is a Boolean value that defaults to TRUE and results in the user being alerted through drupal_set_message() that the name of the file has been changed. The filename, with underscores inserted to disable potential execution, is returned. $extensions = variable_get('upload_extensions_default', 'jpg jpeg gif png txt doc xls pdf ppt pps odt ods odp'); $filename = file_munge_filename($filename, $extensions, FALSE); $filename is now exploit.php_.txt. You can prevent filename munging by defining the Drupal variable allow_insecure_ uploads to be 1 in settings.php. But this is usually a bad idea given the security implications. file_unmunge_filename($filename) This function attempts to undo the effects of file_munge_filename() by replacing an underscore followed by a dot with a dot: $original = file_unmunge_filename('exploit.php_.txt); $original is now exploit.php.txt. Note that this will also replace any intentional occurrences of _. in the original filename.

Summary

Figure 13-8. The AF Client Manager contact view You now have a good idea of how to skin the application and the base components needed to build the AF Client Manager. You can download the full code for the application from this book s detail page at http://www.apress.com.

The following function reports on space used by files. file_space_used($uid = NULL) This function returns total disk space used by files. It does not actually check the file system, but rather reports the sum of the filesize field in the files table in the database. If a user ID is passed to this function, the query is restricted to files that match that user s ID in the files table. The upload module wraps this function with upload_space_used(). Call file_space_ used() directly, as upload_space_used() is only available when the upload module is enabled.

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Module developers can implement hook_file_download() to set access permissions surrounding the download of private files. The hook is used to determine the conditions on which a file will be sent to the browser, and returns additional headers for Drupal to append in response to the file HTTP request. Note that this hook will have no effect if your Drupal installation is using the public file download setting. Figure 13-10 shows an overview of the download process using the implementation of hook_file_download() found in the user module as an example. Because Drupal invokes all modules with a hook_file_download() function for each download, it s important to specify the scope of your hook. For example, take user_file_ download(), which only responds to file downloads if the file to be downloaded is within the pictures directory. If that s true, it appends headers to the request. function user_file_download($file) { $picture_path = variable_get('user_picture_path', 'pictures'); if (strpos($file, $picture_path .'/picture-') === 0) { $info = image_get_info(file_create_path($file)); return array('Content-type: '. $info['mime_type']); } }

Out of the box, Flex applications are ready for use on touch-screen hardware. I refer to the login process on a touch-screen Flex application as Touch In. The applications I have built that allow Touch In run on the Hewlett-Packard TouchSmart PC. The login process for one application I built had authentication handled by the network behind the scenes, and we needed another way to apply security to the application. Since it was a touch-screen application, we created a keypad that granted users access to the application content when they entered their personal ID number, as shown in Figure 13-9. Many new applications are moving toward the use of touch-screen technology on the mobile, surface, and PC platforms. Flex is a great option when building applications for the surface and PC platforms. Figure 13.9 shows an interface that uses Touch In to grant access to application content.

update: The node has just been updated in the database delete: The node was deleted delete revision: A revision of a node was deleted Modules will respond to this if they are keeping data related to the revision The node ID can be found at $node->nid, and the revision ID can be found at $node->vid load: The basic node object has been loaded from the database, plus the additional node properties set by the node type (in response to hook_load(), which has already been run; see Modifying Nodes of Our Type with hook_load() earlier in this chapter) You can add new properties or manipulate node properties.

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