php防止伪造数据从地址栏URL提交的方法,伪造url
php防止伪造数据从地址栏URL提交的方法,伪造url
针对伪造的数据从URL提交的情况,首先是一个检查前一页来源的如下代码:
<?/*PHP防止站外提交数据的方法*/ function CheckURL(){ $servername=$_SERVER['SERVER_NAME']; $sub_from=$_SERVER["HTTP_REFERER"]; $sub_len=strlen($servername); $checkfrom=substr($sub_from,7,$sub_len); if($checkfrom!=$servername)die("警告!你正在从外部提交数据!请立即终止!"); } ?>
这个方法只能防止手动在浏览器地址栏上输入的URL。
事实上只要在服务器上构造出一个指向该URL的超链接(www.jb51.net)比如在发贴时加入超链,再点击,这个Check就完全不起作用了。
目前觉得还是用POST的方法传递重要数据比较可靠。
可以在form中插入一些隐藏的text用于传递数据。
或者使用下面的方法,利用Ajax从客户端向服务器提交数据。
/*创建XHR对象*/ function createXHR() { if (window.XMLHttpRequest){ var oHttp = new XMLHttpRequest(); return oHttp; } else if (window.ActiveXObject){ var versions = ["MSXML2.XmlHttp.6.0","MSXML2.XmlHttp.3.0"]; for (var i = 0; i < versions.length; i++){ try { var oHttp = new ActiveXObject(versions[i]); return oHttp; } catch (error) {} } } throw new Error("你的浏览器不支持AJAX!"); } /*用AJAX向page页面传递数据*/ function ajaxPost(url,query_string='') { var xhr; xhr = createXHR(); xhr.open('POST',url,false); xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=gb2312"); xhr.onreadystatechange = function(){if (xhr.readyState == 4)if (xhr.status != 200)return;} xhr.send(query_string); }
试一试加一个验证码
在第2个页面加个变量传过去,再判断这个变量来决定是不是禁止访问.
index.php
$i=$_GET['i'];
$servername=$HTTP_SERVER_VARS['SERVER_NAME'];
$sub_from=$HTTP_SERVER_VARS["HTTP_REFERER"];
$sub_len=strlen($servername);
$checkfrom=substr($sub_from,10,$sub_len);
if($checkfrom!=$servername and !$i){
echo("<script>alert('请不要从外部提交数据!');window.location.href='login.php';</script>"); <br />exit; <br />} <br />?> <br /><br />p.php<br /><script>window.setTimeout("location='index.php?i=1'",20000)</script> <br /><br />问题是解决了,但是觉得不是很好。呵呵<br />也是一个思路吧,个人挺反感url后带变量的,换成隐藏表单POST过去也是可以的。。不过就不能用js自动跳转了。<br/>
</script>

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