libraries/tbl_replace_fields.inc.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  * handle field values (possibly uploaded from a file)
   5  *
   6  * original if-clause checked, whether input was stored in a possible
   7  * fields_upload_XX var. Now check, if the field is set. If it is empty or a
   8  * malicious file, do not alter fields contents. If an empty or invalid file is
   9  * specified, the binary data gets deleter. Maybe a nice new text-variable is
  10  * appropriate to document this behaviour.
  11  *
  12  * security cautions! You could trick the form and submit any file the
  13  * webserver has access to for upload to a binary field. Shouldn't be that easy! ;)
  14  *
  15  * default is to advance to the field-value parsing. Will only be set to
  16  * true when a binary file is uploaded, thus bypassing further manipulation of $val.
  17  *
  18  * note: grab_globals has extracted the fields from _FILES or HTTP_POST_FILES
  19  *
  20  *
  21  * @uses $_REQUEST
  22  * @uses defined()
  23  * @uses define()
  24  * @uses bin2hex()
  25  * @uses strlen()
  26  * @uses md5()
  27  * @uses implode()
  28  * @uses PMA_NO_VARIABLES_IMPORT
  29  * @uses PMA_sqlAddslashes()
  30  * @package phpMyAdmin
  31  */
  32 if (! defined('PHPMYADMIN')) {
  33     exit;
  34 }
  35
  36 /**
  37  * do not import request variable into global scope
  38  */
  39 if (! defined('PMA_NO_VARIABLES_IMPORT')) {
  40     define('PMA_NO_VARIABLES_IMPORT', true);
  41 }
  42 /**
  43  * Gets some core libraries
  44  */
  45 require_once './libraries/common.inc.php';
  46 require_once './libraries/File.class.php';
  47
  48 $file_to_insert = new PMA_File();
  49 $file_to_insert->checkTblChangeForm($key, $rownumber);
  50
  51 $possibly_uploaded_val = $file_to_insert->getContent();
  52
  53 if ($file_to_insert->isError()) {
  54     $message .= $file_to_insert->getError();
  55 }
  56 $file_to_insert->cleanUp();
  57
  58 if (false !== $possibly_uploaded_val) {
  59     $val = $possibly_uploaded_val;
  60 } else {
  61
  62     // f i e l d    v a l u e    i n    t h e    f o r m
  63
  64     if (isset($me_fields_type[$key])) {
  65         $type = $me_fields_type[$key];
  66     } else {
  67         $type = '';
  68     }
  69
  70     // $key contains the md5() of the fieldname
  71     if (0 === strlen($val) && $type != 'protected') {
  72         // best way to avoid problems in strict mode (works also in non-strict mode)
  73         if (isset($me_auto_increment)  && isset($me_auto_increment[$key])) {
  74             $val = 'NULL';
  75         } else {
  76             $val = "''";
  77         }
  78     } elseif ($type == 'set') {
  79         if (! empty($_REQUEST['fields']['multi_edit'][$rownumber][$key])) {
  80             $val = implode(',', $_REQUEST['fields']['multi_edit'][$rownumber][$key]);
  81             $val = "'" . PMA_sqlAddslashes($val) . "'";
  82         }
  83     } elseif ($type == 'protected') {
  84         // here we are in protected mode (asked in the config)
  85         // so tbl_change has put this special value in the
  86         // fields array, so we do not change the field value
  87         // but we can still handle field upload
  88
  89         // when in UPDATE mode, do not alter field's contents. When in INSERT
  90         // mode, insert empty field because no values were submitted. If protected
  91         // blobs where set, insert original fields content.
  92             if (! empty($prot_row[$me_fields_name[$key]])) {
  93                 $val = '0x' . bin2hex($prot_row[$me_fields_name[$key]]);
  94             } else {
  95                 $val = '';
  96             }
  97     } elseif ($type == 'bit') {
  98         $val = preg_replace('/[^01]/', '0', $val);
  99         $val = "b'" . PMA_sqlAddslashes($val) . "'";
 100     } elseif (! (($type == 'datetime' || $type == 'timestamp') && $val == 'CURRENT_TIMESTAMP')) {
 101         $val = "'" . PMA_sqlAddslashes($val) . "'";
 102     }
 103
 104     // Was the Null checkbox checked for this field?
 105     // (if there is a value, we ignore the Null checkbox: this could
 106     // be possible if Javascript is disabled in the browser)
 107     if (isset($me_fields_null[$key])
 108      && ($val == "''" || $val == '')) {
 109         $val = 'NULL';
 110     }
 111
 112     // The Null checkbox was unchecked for this field
 113     if (empty($val) && isset($me_fields_null_prev[$key]) && ! isset($me_fields_null[$key])) {
 114         $val = "''";
 115     }
 116 }  // end else (field value in the form)
 117 unset($type);
 118 ?>