在php中防注入一般会写一个全局文件用来过滤特殊的字符串,本文章来总结了各种各样的php防注入函数代码,同时还可防sql注入大家可参考.
为了安全,我们常用到下面的函数来过滤一些传递过来的非法字符,PHP防注入函数,代码如下:
-
- $ArrFiltrate=array(“‘”,”;”,”union”,”select”,”delete”,”‘”,”or”,”and”,”=”);
-
- $StrGoUrl=”";
-
- function FunStringExist($StrFiltrate,$ArrFiltrate){
- foreach ($ArrFiltrate as $key=>$value){
- if (eregi($value,$StrFiltrate)){
- return true;
- }
- }
- return false;
- }
-
- if(function_exists(array_merge)){
- $ArrPostAndGet=array_merge($HTTP_POST_VARS,$HTTP_GET_VARS);
- }else{
- foreach($HTTP_POST_VARS as $key=>$value){
- $ArrPostAndGet[]=$value;
- }
- foreach($HTTP_GET_VARS as $key=>$value){
- $ArrPostAndGet[]=$value;
- }
- }
-
- foreach($ArrPostAndGet as $key=>$value){
- if (FunStringExist($value,$ArrFiltrate)){
- if (emptyempty($StrGoUrl)){
- echo “<script language=”javascript”>history.go(-1);</script>”;
- }else{
- echo “<script language=”javascript”>window.location=”".$StrGoUrl.””;</script>”;
- }
- exit;
- }
- }
再看一个实例与上面差不多,这个是dz论坛使用的方法,代码如下:
- $magic_quotes_gpc = get_magic_quotes_gpc();
- @extract(daddslashes($_COOKIE));
- @extract(daddslashes($_POST));
- @extract(daddslashes($_GET));
- if(!$magic_quotes_gpc) {
- $_FILES = daddslashes($_FILES);
- }
- function daddslashes($string, $force = 0) {
- if(!$GLOBALS['magic_quotes_gpc'] || $force) {
- if(is_array($string)) {
- foreach($string as $key => $val) {
- $string[$key] = daddslashes($val, $force);
- }
- } else {
- $string = addslashes($string);
- }
- }
- return $string;
- }
最后发一加强版的,代码如下:
- <?php
- $field = explode(',', $data);
- array_walk($field, array($this, 'add_special_char'));
- $data = implode(',', $field);
-
-
-
-
- public function add_special_char(&$value) {
- if('*' == $value || false !== strpos($value, '(') || false !== strpos($value, '.') || false !== strpos ( $value, '`')) {
-
- } else {
- $value = '`'.trim($value).'`';
- }
- return $value;
- }
- function str_filter($str) {
- $str = htmlspecialchars ( $str );
- if (! get_magic_quotes_gpc ()) {
- $str = addslashes ( $str );
- }
-
- return preg_replace ( "/["'=]|(and)|(or)|(create)|(update)|(alter)|(delete)|(insert)|(load_file)|(outfile)|(count)|(%20)|(char)/i", "", $str );
- }
-
-
-
-
-
-
- function str_check($str) {
- if (! get_magic_quotes_gpc ()) {
- $str = addslashes ( $str );
- }
- $str = str_replace ( "_", "_", $str );
- $str = str_replace ( "%", "%", $str );
- return $str;
- }
-
-
-
-
-
-
-
- function post_check($post) {
- if (! get_magic_quotes_gpc ()) {
- $post = addslashes ( $post );
- }
- $post = str_replace ( "_", "_", $post );
- $post = str_replace ( "%", "%", $post );
- $post = nl2br ( $post );
- $post = htmlspecialchars ( $post );
- return $post;
- }
-
-
-
-
-
-
- function inject_check($sql_str) {
- return eregi('select|insert|and|or|update|delete|'|
-
-
-
-
-
-
-
-
- function verify_id($id=null) {
- if (!$id) { exit('没有提交参数!'); }
- elseif (inject_check($id)) { exit('提交的参数非法!'); }
- elseif (!is_numeric($id)) { exit('提交的参数非法!'); }
- $id = intval($id);
-
- return $id;
- }
-
-
-
-
-
- function HtmlReplace($str, $rptype = 0) {
- $str = stripslashes ( $str );
- if ($rptype == 0) {
- $str = htmlspecialchars ( $str );
- } else if ($rptype == 1) {
- $str = htmlspecialchars ( $str );
- $str = str_replace ( " ", ' ', $str );
- $str = ereg_replace ( "[rnt ]{1,}", ' ', $str );
- } else if ($rptype == 2) {
- $str = htmlspecialchars ( $str );
- $str = str_replace ( " ", '', $str );
- $str = ereg_replace ( "[rnt ]", '', $str );
- } else {
- $str = ereg_replace ( "[rnt ]{1,}", ' ', $str );
- $str = eregi_replace ( 'script', 'script', $str );
- $str = eregi_replace ( "<[/]{0,1}(link|meta|ifr|fra)[^>]*>", '', $str );
- }
- return addslashes ( $str );
- }
-
- function daddslashes($string, $force = 0, $strip = FALSE) {
- if (! get_magic_quotes_gpc () || $force) {
- if (is_array ( $string )) {
- foreach ( $string as $key => $val ) {
- $string [$key] = daddslashes ( $val, $force );
- }
- } else {
- $string = addslashes ( $strip ? stripslashes ( $string ) : $string );
- }
- }
- return $string;
- }
-
-
- function dstripslashes($string) {
- if (is_array ( $string )) {
- foreach ( $string as $key => $val ) {
- $string [$key] = $this->dstripslashes ( $val );
- }
- } else {
- $string = stripslashes ( $string );
- }
- return $string;
- }
-
-
-
-
-
- function safe_replace($string) {
- $string = str_replace('%20','',$string);
- $string = str_replace('%27','',$string);
- $string = str_replace('%2527','',$string);
- $string = str_replace('*','',$string);
- $string = str_replace('"','"',$string);
- $string = str_replace("'",'',$string);
- $string = str_replace('"','',$string);
- $string = str_replace(';','',$string);
- $string = str_replace('<','<',$string);
- $string = str_replace('>','>',$string);
- $string = str_replace("{",'',$string);
- $string = str_replace('}','',$string);
- return $string;
- }
-
-
-
-
-
-
- function new_htmlspecialchars($string) {
- if(!is_array($string))
- return htmlspecialchars($string);
- foreach($string as $key => $val)
- $string[$key] = new_htmlspecialchars($val);
- return $string;
- }
-
-
- function TrimMsg($msg) {
- $msg = trim ( stripslashes ( $msg ) );
- $msg = nl2br ( htmlspecialchars ( $msg ) );
- $msg = str_replace ( " ", " ", $msg );
- return addslashes ( $msg );
- }
- ?>
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