Yii2的XSS攻击防范策略分析

本文实例讲述了Yii2的XSS攻击防范策略。分享给大家供大家参考，具体如下：

XSS 漏洞修复

原则：　不相信客户输入的数据注意: 攻击代码不一定在中

① 将重要的cookie标记为http only,这样的话Javascript 中的document.cookie语句就不能获取到cookie了. ② 只允许用户输入我们期望的数据。例如：　年龄的textBox中，只允许用户输入数字。而数字之外的字符都过滤掉。 ③ 对数据进行Html Encode 处理 ④ 过滤或移除特殊的Html标签，例如: script,iframe,< for <,> for >," for ⑤ 过滤JavaScript 事件的标签。例如 "onclick=","onfocus" 等等。

Yii中的XSS防范

name) ?>

此方法的源码：

charset,$doubleEncode); }

htmlspecialchars & htmlentities & urlencode 三者的区别：

Available flags constants Constant NameDescription ENT_COMPATWill convert double-quotes and leave single-quotes alone. ENT_QUOTESWill convert both double and single quotes. ENT_NOQUOTESWill leave both double and single quotes unconverted. ENT_IGNORESilently discard invalid code unit sequences instead of returning an empty string. Using this flag is discouraged as it » may have security implications. ENT_SUBSTITUTEReplace invalid code unit sequences with a Unicode Replacement Character U+FFFD (UTF-8) or &#FFFD; (otherwise) instead of returning an empty string. ENT_DISALLOWEDReplace invalid code points for the given document type with a Unicode Replacement Character U+FFFD (UTF-8) or &#FFFD; (otherwise) instead of leaving them as is. This may be useful,for instance,to ensure the well-formedness of XML documents with embedded external content. ENT_HTML401Handle code as HTML 4.01. ENT_XML1Handle code as XML 1. ENT_XHTMLHandle code as XHTML. ENT_HTML5Handle code as HTML 5.

htmlspecialchars

Convert special characters to HTML entities

The translations performed are:

& (ampersand) becomes & " (double quote) becomes " when ENT_NOQUOTES is not set. ' (single quote) becomes ' (or ') only when ENT_QUOTES is set. < (less than) becomes < > (greater than) becomes >

Test",ENT_QUOTES); echo $new; // Test ?>

htmlentities

Convert all applicable characters to HTML entities

PHP;"> string htmlentities ( string $string [,bool $double_encode = true ] ] ] )

PHP;"> PHP $str = "A 'quote' is bold"; // Outputs: A 'quote' is bold echo htmlentities($str); // Outputs: A 'quote' is bold echo htmlentities($str,ENT_QUOTES); ?>

urlencode

URL 编码是为了符合url的规范。因为在标准的url规范中中文和很多的字符是不允许出现在url中的。

例如在baidu中搜索"测试汉字"。 URL会变成 http://www.baidu.com/s?wd=%B2%E2%CA%D4%BA%BA%D7%D6&rsv_bp=0&rsv_spt=3&inputT=7477

所谓URL编码就是：　把所有非字母数字字符都将被替换成百分号（%）后跟两位十六进制数，空格则编码为加号（+）　此字符串中除了 -_. 之外的所有非字母数字字符都将被替换成百分号（%）后跟两位十六进制数，空格则编码为加号（+）。此编码与 WWW 表单 POST 数据的编码方式是一样的，同时与 application/x-www-form-urlencoded 的媒体类型编码方式一样。由于历史原因，此编码在将空格编码为加号（+）方面与 RFC1738 编码（参见 rawurlencode()）不同。

PHP;"> PHP echo '

希望本文所述对大家基于Yii框架的 PHP程序设计有所帮助。