Yii2的XSS攻击防范策略分析

(编辑：jimmy 日期: 2024/10/1 浏览：2)

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<script></script>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 >, &quot for
⑤ 过滤JavaScript 事件的标签。例如 "onclick=", "onfocus" 等等。

Yii中的XSS防范

<"htmlcode">

/**
* Encodes special characters into HTML entities.
* The [[\yii\base\Application::charset|application charset]] will be used for encoding.
* @param string $content the content to be encoded
* @param boolean $doubleEncode whether to encode HTML entities in `$content`. If false,
* HTML entities in `$content` will not be further encoded.
* @return string the encoded content
* @see decode()
* @see http://www.php.net/manual/en/function.htmlspecialchars.php
*/
public static function encode($content, $doubleEncode = true)
{
  return htmlspecialchars($content, ENT_QUOTES | ENT_SUBSTITUTE, Yii::$app->charset, $doubleEncode);
}




htmlspecialchars & htmlentities & urlencode 三者的区别：
http://php.net/manual/zh/function.htmlspecialchars.php

http://php.net/manual/zh/function.htmlentities.php

http://cn2.php.net/manual/zh/function.urlencode.php
Available flags constants

Constant Name Description

ENT_COMPAT Will convert double-quotes and leave single-quotes alone.

ENT_QUOTES Will convert both double and single quotes.

ENT_NOQUOTES Will leave both double and single quotes unconverted.

ENT_IGNORE Silently discard invalid code unit sequences instead of returning an empty string. Using this flag is discouraged as it » may have security implications.

ENT_SUBSTITUTE Replace invalid code unit sequences with a Unicode Replacement Character U+FFFD (UTF-8) or &#FFFD; (otherwise) instead of returning an empty string.

ENT_DISALLOWED Replace 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_HTML401 Handle code as HTML 4.01.

ENT_XML1 Handle code as XML 1.

ENT_XHTML Handle code as XHTML.

ENT_HTML5 Handle code as HTML 5.
htmlspecialchars
Convert special characters to HTML entities


string htmlspecialchars ( 
      string $string 
      [, int $flags = ENT_COMPAT | ENT_HTML401 
      [, string $encoding = ini_get("default_charset") 
      [, bool $double_encode = true ]
    ]
  ] 
)




The translations performed are:
& (ampersand) becomes &amp;

" (double quote) becomes &quot; when ENT_NOQUOTES is not set.

' (single quote) becomes &#039; (or &apos;) only when ENT_QUOTES is set.

< (less than) becomes &lt;

> (greater than) becomes &gt;


<"<a href='test'>Test</a>", ENT_QUOTES);
echo $new; // &lt;a href=&#039;test&#039;&gt;Test&lt;/a&gt;
"htmlcode">

string htmlentities ( 
      string $string 
      [, int $flags = ENT_COMPAT | ENT_HTML401 
      [, string $encoding = ini_get("default_charset") 
      [, bool $double_encode = true ]
    ]
  ] 
)






<"A 'quote' is <b>bold</b>";
// Outputs: A 'quote' is &lt;b&gt;bold&lt;/b&gt;
echo htmlentities($str);
// Outputs: A &#039;quote&#039; is &lt;b&gt;bold&lt;/b&gt;
echo htmlentities($str, ENT_QUOTES);
"测试汉字"。 URL会变成

http://www.baidu.com/s"htmlcode">

<"mycgi">';
"htmlcode">

<"mycgi">';
"_blank" href="https://www.jb51.net/Special/386.htm">Yii框架入门及常用技巧总结》、《php优秀开发框架总结》、《smarty模板入门基础教程》、《php面向对象程序设计入门教程》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》
希望本文所述对大家基于Yii框架的PHP程序设计有所帮助。

        
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