XSS CODE
跨站脚本攻击
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README.zh.md
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README.zh.md
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[![NPM version][npm-image]][npm-url]
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[![build status][travis-image]][travis-url]
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[![Test coverage][coveralls-image]][coveralls-url]
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[![David deps][david-image]][david-url]
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[![node version][node-image]][node-url]
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[![npm download][download-image]][download-url]
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[![npm license][license-image]][download-url]
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[npm-image]: https://img.shields.io/npm/v/xss.svg?style=flat-square
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[npm-url]: https://npmjs.org/package/xss
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[travis-image]: https://img.shields.io/travis/leizongmin/js-xss.svg?style=flat-square
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[travis-url]: https://travis-ci.org/leizongmin/js-xss
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[coveralls-image]: https://img.shields.io/coveralls/leizongmin/js-xss.svg?style=flat-square
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[coveralls-url]: https://coveralls.io/r/leizongmin/js-xss?branch=master
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[david-image]: https://img.shields.io/david/leizongmin/js-xss.svg?style=flat-square
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[david-url]: https://david-dm.org/leizongmin/js-xss
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[node-image]: https://img.shields.io/badge/node.js-%3E=_0.10-green.svg?style=flat-square
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[node-url]: http://nodejs.org/download/
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[download-image]: https://img.shields.io/npm/dm/xss.svg?style=flat-square
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[download-url]: https://npmjs.org/package/xss
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[license-image]: https://img.shields.io/npm/l/xss.svg
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根据白名单过滤HTML(防止XSS攻击)
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======
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--------------
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`xss`是一个用于对用户输入的内容进行过滤,以避免遭受XSS攻击的模块
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([什么是XSS攻击?](http://baike.baidu.com/view/2161269.htm))。主要用于论坛、博客、网上商店等等一些可允许用户录入页面排版、
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格式控制相关的HTML的场景,`xss`模块通过白名单来控制允许的标签及相关的标签属性,
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另外还提供了一系列的接口以便用户扩展,比其他同类模块更为灵活。
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**项目主页:** http://jsxss.com
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**在线测试:** http://jsxss.com/zh/try.html
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---------------
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## 特性
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+ 白名单控制允许的HTML标签及各标签的属性
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+ 通过自定义处理函数,可对任意标签及其属性进行处理
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## 参考资料
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+ [XSS与字符编码的那些事儿 ---科普文](http://drops.wooyun.org/tips/689)
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+ [腾讯实例教程:那些年我们一起学XSS](http://www.wooyun.org/whitehats/%E5%BF%83%E4%BC%A4%E7%9A%84%E7%98%A6%E5%AD%90)
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+ [mXSS攻击的成因及常见种类](http://drops.wooyun.org/tips/956)
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+ [XSS Filter Evasion Cheat Sheet](https://www.owasp.org/index.php/XSS_Filter_Evasion_Cheat_Sheet)
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+ [Data URI scheme](http://en.wikipedia.org/wiki/Data_URI_scheme)
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+ [XSS with Data URI Scheme](http://hi.baidu.com/badzzzz/item/bdbafe83144619c199255f7b)
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## 性能(仅作参考)
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+ xss模块:8.2 MB/s
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+ validator@0.3.7模块的xss()函数:4.4 MB/s
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测试代码参考 benchmark 目录
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## 安装
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### NPM
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```bash
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$ npm install xss
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```
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### Bower
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```bash
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$ bower install xss
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```
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或者
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```bash
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$ bower install https://github.com/leizongmin/js-xss.git
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```
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## 使用方法
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### 在Node.js中使用
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```javascript
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var xss = require('xss');
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var html = xss('<script>alert("xss");</script>');
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console.log(html);
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```
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### 在浏览器端使用
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Shim模式(参考文件 `test/test.html`):
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```html
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<script src="https://raw.github.com/leizongmin/js-xss/master/dist/xss.js"></script>
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<script>
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// 使用函数名 filterXSS,用法一样
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var html = filterXSS('<script>alert("xss");</scr' + 'ipt>');
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alert(html);
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</script>
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```
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AMD模式(参考文件 `test/test_amd.html`):
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```html
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<script>
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require.config({
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baseUrl: './',
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paths: {
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xss: 'https://raw.github.com/leizongmin/js-xss/master/dist/xss.js'
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},
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shim: {
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xss: {exports: 'filterXSS'}
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}
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})
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require(['xss'], function (xss) {
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var html = xss('<script>alert("xss");</scr' + 'ipt>');
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alert(html);
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});
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</script>
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```
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### 使用命令行工具来对文件进行XSS处理
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### 处理文件
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可通过内置的 `xss` 命令来对输入的文件进行XSS处理。使用方法:
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```bash
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xss -i <源文件> -o <目标文件>
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```
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例:
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```bash
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$ xss -i origin.html -o target.html
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```
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### 在线测试
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执行以下命令,可在命令行中输入HTML代码,并看到过滤后的代码:
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```bash
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$ xss -t
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```
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详细命令行参数说明,请输入 `$ xss -h` 来查看。
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## 自定义过滤规则
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在调用 `xss()` 函数进行过滤时,可通过第二个参数来设置自定义规则:
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```javascript
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options = {}; // 自定义规则
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html = xss('<script>alert("xss");</script>', options);
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```
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如果不想每次都传入一个 `options` 参数,可以创建一个 `FilterXSS` 实例
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(使用这种方法速度更快):
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```
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options = {}; // 自定义规则
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myxss = new xss.FilterXSS(options);
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// 以后直接调用 myxss.process() 来处理即可
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html = myxss.process('<script>alert("xss");</script>');
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```
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`options` 参数的详细说明见下文。
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### 白名单
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通过 `whiteList` 来指定,格式为:`{'标签名': ['属性1', '属性2']}`。不在白名单上
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的标签将被过滤,不在白名单上的属性也会被过滤。以下是示例:
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```javascript
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// 只允许a标签,该标签只允许href, title, target这三个属性
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var options = {
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whiteList: {
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a: ['href', 'title', 'target']
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}
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};
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// 使用以上配置后,下面的HTML
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// <a href="#" onclick="hello()"><i>大家好</i></a>
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// 将被过滤为
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// <a href="#">大家好</a>
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```
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默认白名单参考 `xss.whiteList`。
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### 自定义匹配到标签时的处理方法
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通过 `onTag` 来指定相应的处理函数。以下是详细说明:
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```javascript
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function onTag (tag, html, options) {
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// tag是当前的标签名称,比如<a>标签,则tag的值是'a'
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// html是该标签的HTML,比如<a>标签,则html的值是'<a>'
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// options是一些附加的信息,具体如下:
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// isWhite boolean类型,表示该标签是否在白名单上
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// isClosing boolean类型,表示该标签是否为闭合标签,比如</a>时为true
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// position integer类型,表示当前标签在输出的结果中的起始位置
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// sourcePosition integer类型,表示当前标签在原HTML中的起始位置
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// 如果返回一个字符串,则当前标签将被替换为该字符串
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// 如果不返回任何值,则使用默认的处理方法:
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// 在白名单上: 通过onTagAttr来过滤属性,详见下文
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// 不在白名单上:通过onIgnoreTag指定,详见下文
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}
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```
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### 自定义匹配到标签的属性时的处理方法
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通过 `onTagAttr` 来指定相应的处理函数。以下是详细说明:
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```javascript
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function onTagAttr (tag, name, value, isWhiteAttr) {
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// tag是当前的标签名称,比如<a>标签,则tag的值是'a'
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// name是当前属性的名称,比如href="#",则name的值是'href'
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// value是当前属性的值,比如href="#",则value的值是'#'
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// isWhiteAttr是否为白名单上的属性
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// 如果返回一个字符串,则当前属性值将被替换为该字符串
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// 如果不返回任何值,则使用默认的处理方法
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// 在白名单上: 调用safeAttrValue来过滤属性值,并输出该属性,详见下文
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// 不在白名单上:通过onIgnoreTagAttr指定,详见下文
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}
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```
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### 自定义匹配到不在白名单上的标签时的处理方法
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通过 `onIgnoreTag` 来指定相应的处理函数。以下是详细说明:
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```javascript
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function onIgnoreTag (tag, html, options) {
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// 参数说明与onTag相同
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// 如果返回一个字符串,则当前标签将被替换为该字符串
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// 如果不返回任何值,则使用默认的处理方法(通过escape指定,详见下文)
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}
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```
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### 自定义匹配到不在白名单上的属性时的处理方法
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通过 `onIgnoreTagAttr` 来指定相应的处理函数。以下是详细说明:
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```javascript
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function onIgnoreTagAttr (tag, name, value, isWhiteAttr) {
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// 参数说明与onTagAttr相同
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// 如果返回一个字符串,则当前属性值将被替换为该字符串
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// 如果不返回任何值,则使用默认的处理方法(删除该属)
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}
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```
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### 自定义HTML转义函数
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通过 `escapeHtml` 来指定相应的处理函数。以下是默认代码 **(不建议修改)** :
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```javascript
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function escapeHtml (html) {
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return html.replace(/</g, '<').replace(/>/g, '>');
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}
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```
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### 自定义标签属性值的转义函数
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通过 `safeAttrValue` 来指定相应的处理函数。以下是详细说明:
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```javascript
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function safeAttrValue (tag, name, value) {
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// 参数说明与onTagAttr相同(没有options参数)
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// 返回一个字符串表示该属性值
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}
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```
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### 自定义CSS过滤器
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如果配置中允许了标签的 `style` 属性,则它的值会通过[cssfilter](https://github.com/leizongmin/js-css-filter) 模块处理。
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`cssfilter` 模块包含了一个默认的CSS白名单,你可以通过以下的方式配置:
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```javascript
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myxss = new xss.FilterXSS({
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css: {
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whiteList: {
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position: /^fixed|relative$/,
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top: true,
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left: true,
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}
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}
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});
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html = myxss.process('<script>alert("xss");</script>');
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```
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如果不想使用 CSS 过滤器来处理 `style` 属性的内容,可指定 `css` 选项的值为 `false`:
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```javascript
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myxss = new xss.FilterXSS({
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css: false,
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});
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```
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要获取更多的帮助信息可看这里:https://github.com/leizongmin/js-css-filter
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### 快捷配置
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#### 去掉不在白名单上的标签
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通过 `stripIgnoreTag` 来设置:
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+ `true`:去掉不在白名单上的标签
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+ `false`:(默认),使用配置的`escape`函数对该标签进行转义
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示例:
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当设置 `stripIgnoreTag = true`时,以下代码
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```html
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code:<script>alert(/xss/);</script>
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```
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过滤后将输出
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```html
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code:alert(/xss/);
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```
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#### 去掉不在白名单上的标签及标签体
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通过 `stripIgnoreTagBody` 来设置:
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+ `false|null|undefined`:(默认),不特殊处理
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+ `'*'|true`:去掉所有不在白名单上的标签
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+ `['tag1', 'tag2']`:仅去掉指定的不在白名单上的标签
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示例:
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当设置 `stripIgnoreTagBody = ['script']`时,以下代码
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```html
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code:<script>alert(/xss/);</script>
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```
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过滤后将输出
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```html
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code:
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```
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#### 去掉HTML备注
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通过 `allowCommentTag` 来设置:
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+ `true`:不处理
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+ `false`:(默认),自动去掉HTML中的备注
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示例:
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当设置 `allowCommentTag = false` 时,以下代码
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```html
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code:<!-- something --> END
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```
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过滤后将输出
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```html
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code: END
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```
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## 应用实例
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### 允许标签以data-开头的属性
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```javascript
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var source = '<div a="1" b="2" data-a="3" data-b="4">hello</div>';
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var html = xss(source, {
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onIgnoreTagAttr: function (tag, name, value, isWhiteAttr) {
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if (name.substr(0, 5) === 'data-') {
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// 通过内置的escapeAttrValue函数来对属性值进行转义
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return name + '="' + xss.escapeAttrValue(value) + '"';
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}
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}
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});
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console.log('%s\nconvert to:\n%s', source, html);
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```
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运行结果:
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```html
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<div a="1" b="2" data-a="3" data-b="4">hello</div>
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convert to:
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<div data-a="3" data-b="4">hello</div>
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```
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### 允许名称以x-开头的标签
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```javascript
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var source = '<x><x-1>he<x-2 checked></x-2>wwww</x-1><a>';
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var html = xss(source, {
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onIgnoreTag: function (tag, html, options) {
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if (tag.substr(0, 2) === 'x-') {
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// 不对其属性列表进行过滤
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return html;
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}
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}
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});
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console.log('%s\nconvert to:\n%s', source, html);
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```
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运行结果:
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```html
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<x><x-1>he<x-2 checked></x-2>wwww</x-1><a>
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convert to:
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<x><x-1>he<x-2 checked></x-2>wwww</x-1><a>
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```
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||||
### 分析HTML代码中的图片列表
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||||
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```javascript
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var source = '<img src="img1">a<img src="img2">b<img src="img3">c<img src="img4">d';
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var list = [];
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var html = xss(source, {
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onTagAttr: function (tag, name, value, isWhiteAttr) {
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if (tag === 'img' && name === 'src') {
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// 使用内置的friendlyAttrValue函数来对属性值进行转义,可将<这类的实体标记转换成打印字符<
|
||||
list.push(xss.friendlyAttrValue(value));
|
||||
}
|
||||
// 不返回任何值,表示还是按照默认的方法处理
|
||||
}
|
||||
});
|
||||
|
||||
console.log('image list:\n%s', list.join(', '));
|
||||
```
|
||||
|
||||
运行结果:
|
||||
|
||||
```html
|
||||
image list:
|
||||
img1, img2, img3, img4
|
||||
```
|
||||
|
||||
### 去除HTML标签(只保留文本内容)
|
||||
|
||||
```javascript
|
||||
var source = '<strong>hello</strong><script>alert(/xss/);</script>end';
|
||||
var html = xss(source, {
|
||||
whiteList: [], // 白名单为空,表示过滤所有标签
|
||||
stripIgnoreTag: true, // 过滤所有非白名单标签的HTML
|
||||
stripIgnoreTagBody: ['script'] // script标签较特殊,需要过滤标签中间的内容
|
||||
});
|
||||
|
||||
console.log('text: %s', html);
|
||||
```
|
||||
|
||||
运行结果:
|
||||
|
||||
```html
|
||||
text: helloend
|
||||
```
|
||||
|
||||
|
||||
## 授权协议
|
||||
|
||||
```
|
||||
Copyright (c) 2012-2016 Zongmin Lei(雷宗民) <leizongmin@gmail.com>
|
||||
http://ucdok.com
|
||||
|
||||
The MIT License
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining
|
||||
a copy of this software and associated documentation files (the
|
||||
"Software"), to deal in the Software without restriction, including
|
||||
without limitation the rights to use, copy, modify, merge, publish,
|
||||
distribute, sublicense, and/or sell copies of the Software, and to
|
||||
permit persons to whom the Software is furnished to do so, subject to
|
||||
the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be
|
||||
included in all copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
||||
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
||||
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
||||
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||||
```
|
||||
Reference in New Issue
Block a user