这篇文章主要介绍了简单实用的PHP防注入类实例,以两个简单的防注入类为例介绍了PHP防注入的原理与技巧,对网站安全建设来说非常具有实用价值,需要的朋友可以参考下
本文实例讲述了简单实用的PHP防注入类。分享给大家供大家参考。具体如下:
PHP防注入注意要过滤的信息基本是get,post,然后对于sql就是我们常用的查询,插入等等sql命令了,下面我给各位整理两个简单的例子,希望这些例子能给你网站带来安全.
PHP防注入类代码如下:
<?php
/**
* 参数处理类
* @author JasonWei
*/
class Params
{
public $get = array();
public $post = array();
function __construct()
{
if (!emptyempty($_GET)) {
foreach ($_GET as $key => $val) {
if (is_numeric($val)) {
$this->get[$key] = $this->getInt($val);
} else {
$this->get[$key] = $this->getStr($val);
}
}
}
if (!emptyempty($_POST)) {
foreach ($_POST as $key => $val) {
if (is_numeric($val)) {
$this->post[$key] = $this->getInt($val);
} else {
$this->post[$key] = $this->getStr($val);
}
}
}
}
public function getInt($number)
{
return intval($number);
}
public function getStr($string)
{
if (!get_magic_quotes_gpc()) {
$string = addslashes($string);
}
return $string;
}
public function checkInject($string)
{
return eregi('select|insert|update|delete|/*|*|../|./|union|into|load_file|outfile', $string);
}
public function verifyId($id = null)
{
if (!$id || $this->checkInject($id) || !is_numeric($id)) {
$id = false;
} else {
$id = intval($id);
}
return $id;
}
}
?>
/**
* 参数处理类
* @author JasonWei
*/
class Params
{
public $get = array();
public $post = array();
function __construct()
{
if (!emptyempty($_GET)) {
foreach ($_GET as $key => $val) {
if (is_numeric($val)) {
$this->get[$key] = $this->getInt($val);
} else {
$this->get[$key] = $this->getStr($val);
}
}
}
if (!emptyempty($_POST)) {
foreach ($_POST as $key => $val) {
if (is_numeric($val)) {
$this->post[$key] = $this->getInt($val);
} else {
$this->post[$key] = $this->getStr($val);
}
}
}
}
public function getInt($number)
{
return intval($number);
}
public function getStr($string)
{
if (!get_magic_quotes_gpc()) {
$string = addslashes($string);
}
return $string;
}
public function checkInject($string)
{
return eregi('select|insert|update|delete|/*|*|../|./|union|into|load_file|outfile', $string);
}
public function verifyId($id = null)
{
if (!$id || $this->checkInject($id) || !is_numeric($id)) {
$id = false;
} else {
$id = intval($id);
}
return $id;
}
}
?>
例子二,代码如下:
<?php
/*************************
说明:
判断传递的变量中是否含有非法字符
如$_POST、$_GET
功能:
防注入
*************************/
//要过滤的非法字符
$ArrFiltrate=array("'","or","and","union","where");
//出错后要跳转的url,不填则默认前一页
$StrGoUrl="";
//是否存在数组中的值
function FunStringExist($StrFiltrate,$ArrFiltrate){
foreach ($ArrFiltrate as $key=>$value){
if (eregi($value,$StrFiltrate)){
return true;
}
}
return false;
}
//合并$_POST 和 $_GET
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;
}
}
//验证开始
foreach($ArrPostAndGet as $key=>$value){
if (FunStringExist($value,$ArrFiltrate)){
echo "<script language='javascript'>alert('传递的信息中不得包含{',or,and,union}等非法字符请您把他们换成{‘,OR,AND,UNION}');</script>";
if (emptyempty($StrGoUrl)){
echo "<scriptlanguage='javascript'>history.go(-1);</script>";
}else{
echo "<scriptlanguage='javascript'>window.location='".$StrGoUrl."';</script>";
}
exit;
}
}
/***************结束防止PHP注入*****************/
?>
/*************************
说明:
判断传递的变量中是否含有非法字符
如$_POST、$_GET
功能:
防注入
*************************/
//要过滤的非法字符
$ArrFiltrate=array("'","or","and","union","where");
//出错后要跳转的url,不填则默认前一页
$StrGoUrl="";
//是否存在数组中的值
function FunStringExist($StrFiltrate,$ArrFiltrate){
foreach ($ArrFiltrate as $key=>$value){
if (eregi($value,$StrFiltrate)){
return true;
}
}
return false;
}
//合并$_POST 和 $_GET
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;
}
}
//验证开始
foreach($ArrPostAndGet as $key=>$value){
if (FunStringExist($value,$ArrFiltrate)){
echo "<script language='javascript'>alert('传递的信息中不得包含{',or,and,union}等非法字符请您把他们换成{‘,OR,AND,UNION}');</script>";
if (emptyempty($StrGoUrl)){
echo "<scriptlanguage='javascript'>history.go(-1);</script>";
}else{
echo "<scriptlanguage='javascript'>window.location='".$StrGoUrl."';</script>";
}
exit;
}
}
/***************结束防止PHP注入*****************/
?>
希望本文所述对大家的PHP程序设计有所帮助。