最近dedecms報漏洞不斷，這裡分享下php的過濾函數，大牛飄過吧,給小黑闊們學習交流用
函數代碼： 代碼如下: //php 批量過濾post,get敏感數據 if (get_magic_quotes_gpc()) { $_GET = stripslashes_array($_GET); $_POST = stripslashes_array($_POST); } function stripslashes_array(&$array) { while(list($key,$var) = each($array)) { if ($key != 'argc' && $key != 'argv' && (strtoupper($key) != $key || ''.intval($key) == "$key")) { if (is_string($var)) { $array[$key] = stripslashes($var); } if (is_array($var)) { $array[$key] = stripslashes_array($var); } } } return $array; } //過濾 function htmlencode($str){ if(empty($str)) return; if($str=="") return $str; $str=trim($str); $str=str_replace("&","&",$str); $str=str_replace(">",">",$str); $str=str_replace("<","<",$str); $str=str_replace(chr(32)," ",$str); $str=str_replace(chr(9)," ",$str); $str=str_replace(chr(9)," ",$str); $str=str_replace(chr(34),"&",$str); $str=str_replace(chr(39),"'",$str); $str=str_replace(chr(13)," ",$str); $str=str_replace("'","''",$str); $str=str_replace("select","select",$str); $str=str_replace("SCRIPT","SCRIPT",$str); $str=str_replace("script","script",$str); $str=str_replace("join","join",$str); $str=str_replace("union","union",$str); $str=str_replace("where","where",$str); $str=str_replace("insert","insert",$str); $str=str_replace("delete","delete",$str); $str=str_replace("update","update",$str); $str=str_replace("like","like",$str); $str=str_replace("drop","drop",$str); $str=str_replace("create","create",$str); $str=str_replace("modify","modify",$str); $str=str_replace("rename","rename",$str); $str=str_replace("alter","alter",$str); $str=str_replace("cast","cas",$str); return $str; } //解碼 function htmldecode($str){ if(empty($str)) return; if($str=="") return $str; $str=str_replace("select","select",$str); $str=str_replace("join","join",$str); $str=str_replace("union","union",$str); $str=str_replace("where","where",$str); $str=str_replace("insert","insert",$str); $str=str_replace("delete","delete",$str); $str=str_replace("update","update",$str); $str=str_replace("like","like",$str); $str=str_replace("drop","drop",$str); $str=str_replace("create","create",$str); $str=str_replace("modify","modify",$str); $str=str_replace("rename","rename",$str); $str=str_replace("alter","alter",$str); $str=str_replace("cas","cast",$str); $str=str_replace("&","&",$str); $str=str_replace(">",">",$str); $str=str_replace("<","<",$str); $str=str_replace(" ",chr(32),$str); $str=str_replace(" ",chr(9),$str); $str=str_replace(" ",chr(9),$str); $str=str_replace("&",chr(34),$str); $str=str_replace("'",chr(39),$str); $str=str_replace(" ",chr(13),$str); $str=str_replace("''","'",$str); return $str; } // 函數：string_filter($string, $match_type=1) // 功能：過濾非法內容 // 參數： // $string 需要檢查的字符串 // $match_type 匹配類型,1為精確匹配, 2為模糊匹配，默認為1 // // 返回：有非法內容返回True，無非法內容返回False // 其他：非法關鍵字列表保存在txt文件裡, 分為普通非法關鍵字和嚴重非法關鍵字兩個列表 // 作者：heiyeluren // 時間：2006-1-18 // //====================================================================== function lib_lawless_string_filter($string, $match_type=1) { //字符串空直接返回為非法 $string = trim($string); if (empty($string)) { return false; } //獲取重要關鍵字列表和普通關鍵字列表 $common_file = "common_list.txt"; //通用過濾關鍵字列表 $signify_file = "signify_list.txt"; //重要過濾關鍵字列表 //如果任何列表文件不存在直接返回false，否則把兩個文件列表讀取到兩個數組裡 if (!file_exists($common_file) || !file_exists($signify_file)) { return false; } $common_list = file($common_file); $signify_list = file($signify_file); //精確匹配 if ($match_type == 1) { $is_lawless = exact_match($string, $common_list); } //模糊匹配 if ($match_type == 2) { $is_lawless = blur_match($string, $common_list, $signify_list); } //判斷檢索結果數組中是否有數據，如果有，證明是非法的 if (is_array($is_lawless) && !empty($is_lawless)) { return true; } else { return false; } } //--------------------- // 精確匹配,為過濾服務 //--------------------- function exact_match($string, $common_list) { $string = trim($string); $string = lib_replace_end_tag($string); //檢索普通過濾關鍵字列表 foreach($common_list as $block) { $block = trim($block); if (preg_match("/^$string$/i", $block)) { $blist[] = $block; } } //判斷有沒有過濾內容在數組裡 if (!empty($blist)) { return array_unique($blist); } return false; } //---------------------- // 模糊匹配,為過濾服務 //---------------------- function blur_match($string, $common_list, $signify_list) { $string = trim($string); $s_len = strlen($string); $string = lib_replace_end_tag($string); //檢索普通過濾關鍵字列表 foreach($common_list as $block) { $block = trim($block); if (preg_match("/^$string$/i", $block)) { $blist[] = $block; } } //檢索嚴重過濾關鍵字列表 foreach($signify_list as $block) { $block = trim($block); if ($s_len>=strlen($block) && preg_match("/$block/i", $string)) { $blist[] = $block; } } //判斷有沒有過濾內容在數組裡 if (!empty($blist)) { return array_unique($blist); } return false; } //-------------------------- // 替換HTML尾標簽,為過濾服務 //-------------------------- function lib_replace_end_tag($str) { if (empty($str)) return false; $str = htmlspecialchars($str); $str = str_replace( '/', "", $str); $str = str_replace("", "", $str); $str = str_replace(">", "", $str); $str = str_replace("<", "", $str); $str = str_replace("", "", $str); $str = str_replace("", "", $str); $str=str_replace("select","select",$str); $str=str_replace("join","join",$str); $str=str_replace("union","union",$str); $str=str_replace("where","where",$str); $str=str_replace("insert","insert",$str); $str=str_replace("delete","delete",$str); $str=str_replace("update","update",$str); $str=str_replace("like","like",$str); $str=str_replace("drop","drop",$str); $str=str_replace("create","create",$str); $str=str_replace("modify","modify",$str); $str=str_replace("rename","rename",$str); $str=str_replace("alter","alter",$str); $str=str_replace("cas","cast",$str); $str=str_replace("&","&",$str); $str=str_replace(">",">",$str); $str=str_replace("<","<",$str); $str=str_replace(" ",chr(32),$str); $str=str_replace(" ",chr(9),$str); $str=str_replace(" ",chr(9),$str); $str=str_replace("&",chr(34),$str); $str=str_replace("'",chr(39),$str); $str=str_replace(" ",chr(13),$str); $str=str_replace("''","'",$str); $str=str_replace("css","'",$str); $str=str_replace("CSS","'",$str); return $str; //HTML標簽，可以作為擴展過濾 /* $tags = array("/html", "/head", "/body", "/div", "/span", "/DOCTYPE", "/title", "/link", "/meta", "/style", "/p", "/h1,", "/h2,", "/h3,", "/h4,", "/h5,", "/h6", "/strong", "/em", "/abbr", "/acronym", "/address", "/bdo", "/blockquote", "/cite", "/q", "/code", "/ins", "/del", "/dfn", "/kbd", "/pre", "/samp", "/var", "/br", "/a", "/img", "/area", "/map", "/object", "/param", "/ul", "/ol", "/li", "/dl", "/dt", "/dd", "/table", "/tr", "/td", "/th", "/tbody", "/thead", "/tfoot", "/col", "/colgroup", "/caption", "/form", "/input", "/textarea", "/select", "/option", "/optgroup", "/button", "/label", "/fieldset", "/legend", "/script", "/noscript", "/b", "/i", "/tt", "/sub", "/sup", "/big", "/small", "/hr" ); */ } 代碼： 引用是直接這樣： 代碼如下: $xxx = htmlspecialchars($_POST['xxx']); 或者 代碼如下: $xxx = htmlspecialchars($_GET['xxx']);
