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<?php |
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/* |
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You may not change or alter any portion of this comment or credits |
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of supporting developers from this source code or any supporting source code |
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which is considered copyrighted (c) material of the original comment or credit authors. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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*/ |
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/** |
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* Protector |
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* |
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* @copyright XOOPS Project (http://xoops.org) |
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* @license GNU GPL 2 or later (http://www.gnu.org/licenses/gpl-2.0.html) |
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* @package protector |
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* @author trabis <[email protected]> |
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* @version $Id$ |
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*/ |
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$root_path = \XoopsBaseConfig::get('root-path'); |
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$db_type = \XoopsBaseConfig::get('db-type'); |
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if (XoopsLoad::fileExists($root_path.'/class/database/drivers/'.$db_type.'/database.php')) { |
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require_once $root_path.'/class/database/drivers/'.$db_type.'/database.php'; |
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} else { |
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require_once $root_path.'/class/database/'.$db_type.'database.php'; |
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} |
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require_once $root_path.'/class/database/database.php' ; |
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class ProtectorMySQLDatabase extends XoopsMySQLDatabaseProxy |
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{ |
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public $doubtful_requests = array() ; |
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public $doubtful_needles = array( |
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// 'order by' , |
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'concat' , |
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'information_schema' , |
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'select' , |
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'union' , |
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'/*' , /**/ |
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'--' , |
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'#' , |
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) ; |
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public function __construct() |
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{ |
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$protector = Protector::getInstance() ; |
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$this->doubtful_requests = $protector->getDblayertrapDoubtfuls() ; |
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$this->doubtful_needles = array_merge($this->doubtful_needles, $this->doubtful_requests) ; |
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} |
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public function injectionFound($sql) |
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{ |
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$protector = Protector::getInstance() ; |
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$protector->last_error_type = 'SQL Injection' ; |
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$protector->message .= $sql ; |
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$protector->output_log($protector->last_error_type) ; |
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die('SQL Injection found') ; |
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} |
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public function separateStringsInSQL($sql) |
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{ |
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$sql = trim($sql) ; |
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$sql_len = strlen($sql) ; |
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$char = '' ; |
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$string_start = '' ; |
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$in_string = false; |
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$sql_wo_string = '' ; |
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$strings = array() ; |
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$current_string = '' ; |
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for ($i = 0 ; $i < $sql_len ; ++$i) { |
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$char = $sql[$i] ; |
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if ($in_string) { |
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while (1) { |
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$new_i = strpos($sql, $string_start, $i) ; |
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$current_string .= substr($sql, $i, $new_i - $i + 1) ; |
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$i = $new_i ; |
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if ($i === false) { |
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break 2 ; |
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} elseif ( /* $string_start == '`' || */ $sql[$i-1] !== '\\') { |
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$string_start = '' ; |
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$in_string = false ; |
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$strings[] = $current_string ; |
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break ; |
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} else { |
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$j = 2 ; |
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$escaped_backslash = false ; |
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while ($i - $j > 0 && $sql[$i-$j] === '\\') { |
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$escaped_backslash = ! $escaped_backslash ; |
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++$j; |
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} |
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if ($escaped_backslash) { |
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$string_start = '' ; |
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$in_string = false ; |
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$strings[] = $current_string ; |
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break ; |
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} else { |
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++$i; |
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} |
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} |
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} |
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} elseif ($char === '"' || $char === "'") { // dare to ignore `` |
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$in_string = true ; |
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$string_start = $char ; |
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$current_string = $char ; |
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} else { |
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$sql_wo_string .= $char ; |
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} |
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// dare to ignore comment |
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// because unescaped ' or " have been already checked in stage1 |
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} |
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return array( $sql_wo_string , $strings ) ; |
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} |
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/** |
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* @param string $sql |
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*/ |
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public function checkSql($sql) |
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{ |
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list($sql_wo_strings, $strings) = $this->separateStringsInSQL($sql) ; |
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// stage1: addslashes() processed or not |
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foreach ($this->doubtful_requests as $request) { |
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if (addslashes($request) != $request) { |
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if (stristr($sql, trim($request))) { |
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// check the request stayed inside of strings as whole |
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$ok_flag = false ; |
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foreach ($strings as $string) { |
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if (strstr($string, $request)) { |
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$ok_flag = true ; |
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break ; |
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} |
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} |
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if (! $ok_flag) { |
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$this->injectionFound($sql) ; |
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} |
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} |
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} |
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} |
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// stage2: doubtful requests exists and outside of quotations ('or") |
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// $_GET['d'] = '1 UNION SELECT ...' |
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// NG: select a from b where c=$d |
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// OK: select a from b where c='$d_escaped' |
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// $_GET['d'] = '(select ... FROM)' |
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// NG: select a from b where c=(select ... from) |
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foreach ($this->doubtful_requests as $request) { |
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if (strstr($sql_wo_strings, trim($request))) { |
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$this->injectionFound($sql) ; |
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} |
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} |
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// stage3: comment exists or not without quoted strings (too sensitive?) |
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if (preg_match('/(\/\*|\-\-|\#)/', $sql_wo_strings, $regs)) { |
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foreach ($this->doubtful_requests as $request) { |
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if (strstr($request, $regs[1])) { |
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$this->injectionFound($sql) ; |
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} |
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} |
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} |
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} |
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public function query($sql, $limit = 0, $start = 0) |
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{ |
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$sql4check = substr($sql, 7) ; |
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foreach ($this->doubtful_needles as $needle) { |
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if (stristr($sql4check, $needle)) { |
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$this->checkSql($sql) ; |
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break ; |
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} |
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} |
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if (! defined('XOOPS_DB_PROXY')) { |
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$ret = parent::queryF($sql, $limit, $start) ; |
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} else { |
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$ret = parent::query($sql, $limit, $start) ; |
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} |
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return $ret ; |
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} |
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} |
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XOOPS /
XoopsCore
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