library/sanitize.inc.php

   1 <?php
   2 /**
   3 * Function to check and/or sanitize things for security such as
   4 * directories names, file names, etc.
   5  *
   6  * @package OpenEMR
   7  * @link    http://www.open-emr.org
   8  * @author  Brady Miller <brady.g.miller@gmail.com>
   9  * @author  Roberto Vasquez <robertogagliotta@gmail.com>
  10  * @author  Shachar Zilbershlag <shaharzi@matrix.co.il>
  11  * @copyright Copyright (c) 2012-2017 Brady Miller <brady.g.miller@gmail.com>
  12  * @license https://github.com/openemr/openemr/blob/master/LICENSE GNU General Public License 3
  13  */
  14
  15
  16 // If the label contains any illegal characters, then the script will die.
  17 function check_file_dir_name($label)
  18 {
  19     if (empty($label) || preg_match('/[^A-Za-z0-9_.-]/', $label)) {
  20         error_log("ERROR: The following variable contains invalid characters:" . $label);
  21         die(xlt("ERROR: The following variable contains invalid characters").": ". attr($label));
  22     }
  23 }
  24
  25 // Convert all illegal characters to _
  26 function convert_safe_file_dir_name($label)
  27 {
  28     return preg_replace('/[^A-Za-z0-9_.-]/','_',$label);
  29 }
  30
  31 //Basename functionality for nonenglish languages (without this, basename function ommits nonenglish characters).
  32 function basename_international($path)
  33 {
  34     $parts = preg_split('~[\\\\/]~', $path);
  35     foreach ($parts as $key => $value){
  36         $encoded = urlencode($value);
  37         $parts[$key] = $encoded;
  38     }
  39     $encoded_path = implode("/", $parts);
  40     $encoded_file_name = basename($encoded_path);
  41     $decoded_file_name = urldecode($encoded_file_name);
  42
  43     return $decoded_file_name;
  44 }
  45
  46
  47 /**
  48  * This function detects a MIME type for a file and check if it in the white list of the allowed mime types.
  49  * @param string $file - file location.
  50  * @param array|null $whiteList - array of mime types that allowed to upload.
  51  */
  52 // Regarding the variable below. In the case of multiple file upload the isWhiteList function will run multiple
  53 // times, therefore, storing the white list in the variable below to prevent multiple requests from database.
  54 $white_list = null;
  55 function isWhiteFile($file)
  56 {
  57     global $white_list;
  58     if(is_null($white_list)){
  59         $white_list = array();
  60         $lres = sqlStatement("SELECT option_id FROM list_options WHERE list_id = 'files_white_list' AND activity = 1");
  61         while ($lrow = sqlFetchArray($lres)) {
  62             $white_list[] = $lrow['option_id'];
  63         }
  64     }
  65
  66     $mimetype  = mime_content_type($file);
  67     if(in_array($mimetype, $white_list)){
  68         return true;
  69     } else {
  70         $splitMimeType = explode('/', $mimetype);
  71         $categoryType = $splitMimeType[0];
  72         if(in_array($categoryType. '/*',  $white_list))return true;
  73     }
  74     return false;
  75 }
  76
  77 ?>