生成浏览器端使用的文件

This commit is contained in:
Lei Zongmin
2013-04-19 16:36:49 +08:00
parent 792a78b615
commit bd8397a26d
2 changed files with 359 additions and 0 deletions

View File

@@ -84,6 +84,18 @@ var html = xss('<script>alert("xss");</script>', options);
console.log(html);
```
### 在浏览器端使用
```
<script src="https://raw.github.com/leizongmin/js-xss/master/build/xss.js"></script>
<script>
// 使用函数名 filterXSS用法一样
var html = filterXSS('<script>alert("xss");</scr' + 'ipt>');
alert(html);
</script>
```
## 其他应用

347
build/xss.js Normal file
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@@ -0,0 +1,347 @@
;(function(e,t,n,r){function i(r){if(!n[r]){if(!t[r]){if(e)return e(r);throw new Error("Cannot find module '"+r+"'")}var s=n[r]={exports:{}};t[r][0](function(e){var n=t[r][1][e];return i(n?n:e)},s,s.exports)}return n[r].exports}for(var s=0;s<r.length;s++)i(r[s]);return i})(typeof require!=="undefined"&&require,{1:[function(require,module,exports){/**
* 过滤XSS攻击
*
* @author 老雷<leizongmin@gmail.com>
*/
/*
* 默认HTML标签白名单
* 标签名=>属性列表
*/
var defaultWhiteList = {
h1: ['style', 'class'],
h2: ['style', 'class'],
h3: ['style', 'class'],
h4: ['style', 'class'],
h5: ['style', 'class'],
h6: ['style', 'class'],
hr: ['style', 'class'],
span: ['style', 'class'],
strong: ['style', 'class'],
b: ['style', 'class'],
i: ['style', 'class'],
br: [],
p: ['style', 'class'],
pre: ['style', 'class'],
code: ['style', 'class'],
a: ['style', 'class', 'target', 'href', 'title'],
img: ['style', 'class', 'src', 'alt', 'title'],
div: ['style', 'class'],
table: ['style', 'class', 'width', 'border'],
tr: ['style', 'class'],
td: ['style', 'class', 'width', 'colspan'],
th: ['style', 'class', 'width', 'colspan'],
tbody: ['style', 'class'],
ul: ['style', 'class'],
li: ['style', 'class'],
ol: ['style', 'class'],
dl: ['style', 'class'],
dt: ['style', 'class'],
em: ['style'],
cite: ['style'],
section:['style', 'class'],
header: ['style', 'class'],
footer: ['style', 'class'],
blockquote: ['style', 'class'],
audio: ['autoplay', 'controls', 'loop', 'preload', 'src'],
video: ['autoplay', 'controls', 'loop', 'preload', 'src', 'height', 'width'],
};
/**
* 过滤属性值
*
* @param {string} tag 标签名
* @param {string} attr 属性名
* @param {string} value 属性值
* @return {string} 若不需要修改属性值,不返回任何值
*/
var defaultOnTagAttr = function (tag, attr, value) {
if (attr === 'href' || attr === 'src') {
if (/\/\*|\*\//mg.test(value)) {
return '#';
}
if (/^[\s"'`]*((j\s*a\s*v\s*a|v\s*b|l\s*i\s*v\s*e)\s*s\s*c\s*r\s*i\s*p\s*t\s*|m\s*o\s*c\s*h\s*a):/ig.test(value)) {
return '#';
}
} else if (attr === 'style') {
if (/\/\*|\*\//mg.test(value)) {
return '#';
}
if (/((j\s*a\s*v\s*a|v\s*b|l\s*i\s*v\s*e)\s*s\s*c\s*r\s*i\s*p\s*t\s*|m\s*o\s*c\s*h\s*a):/ig.test(value)) {
return '';
}
}
};
/**
* 过滤非白名单的标签
*
* @param {string} tag 标签名
* @param {string} html 标签HTML代码包括属性值
* @param {object} options 更多属性:
* position在返回的HTML代码中的开始位置
* originalPosition在原HTML代码中的开始位置
* isClosing是否为闭合标签如</a>
* @return {string} 若不返回任何值,则默认替换<>为&lt;&gt;
*/
var defaultOnIgnoreTag = function (tag, html, options) {
return noTag(html);
};
/**
* 转换<>为&lt; &gt
*
* @param {string} text
* @return {string}
*/
var noTag = function (text) {
return text.replace(/</g, '&lt;').replace(/>/g, '&gt;');
};
/**
* XSS过滤
*
* @param {string} html 要过滤的HTML代码
* @param {object} options 选项whiteList, onTagAttr, onIgnoreTag
* @return {string}
*/
exports = module.exports = function (html, options) {
'use strict';
options = options || {};
var whiteList = options.whiteList || exports.whiteList;
var onTagAttr = options.onTagAttr || exports.onTagAttr;
var onIgnoreTag = options.onIgnoreTag || exports.onIgnoreTag;
var rethtml = '';
var lastPos = 0;
var tagStart = false;
var quoteStart = false;
var currentPos = 0;
/**
* 过滤不合法的属性
*/
var filterAttributes = function (tagName, attrs) {
tagName = tagName.toLowerCase();
var whites = whiteList[tagName];
var lastPos = 0;
var _attrs = [];
var tmpName = false;
var hasSprit = false;
var addAttr = function (name, value) {
name = name.trim();
if (!hasSprit && name === '/') {
hasSprit = true;
return;
};
name = name.replace(/[^a-zA-Z0-9_:\.\-]/img, '').toLowerCase();
if (name.length < 1) return;
if (whites.indexOf(name) !== -1) {
if (value) {
value = value.trim().replace(/"/g, '&quote;');
// 转换unicode字符 及过滤不可见字符
value = value.replace(/&#([a-zA-Z0-9]*);?/img, function (str, code) {
code = parseInt(code);
return String.fromCharCode(code);
});
var _value = '';
for (var i = 0, len = value.length; i < len; i++) {
_value += value.charCodeAt(i) < 32 ? ' ' : value[i];
}
value = _value.trim();
var newValue = onTagAttr(tagName, name, value);
if (typeof(newValue) !== 'undefined') {
value = newValue;
}
}
_attrs.push(name + (value ? '="' + value + '"' : ''));
}
};
for (var i = 0, len = attrs.length; i < len; i++) {
var c = attrs[i];
if (tmpName === false && c === '=') {
tmpName = attrs.slice(lastPos, i);
lastPos = i + 1;
continue;
}
if (tmpName !== false) {
if (i === lastPos && (c === '"' || c === "'")) {
var j = attrs.indexOf(c, i + 1);
if (j === -1) {
break;
} else {
var v = attrs.slice(lastPos + 1, j).trim();
addAttr(tmpName, v);
tmpName = false;
i = j;
lastPos = i + 1;
continue;
}
}
}
if (c === ' ') {
var v = attrs.slice(lastPos, i).trim();
if (tmpName === false) {
addAttr(v);
} else {
addAttr(tmpName, v);
}
tmpName = false;
lastPos = i + 1;
continue;
}
}
if (lastPos < attrs.length) {
if (tmpName === false) {
addAttr(attrs.slice(lastPos));
} else {
addAttr(tmpName, attrs.slice(lastPos));
}
}
if (hasSprit) _attrs.push('/');
return _attrs.join(' ');
};
/**
* 检查标签是否合法
*/
var addNewTag = function (tag, end) {
rethtml += noTag(html.slice(lastPos, tagStart));
lastPos = end + 1;
var spos = tag.slice(0, 2) === '</' ? 2 : 1;
var i = tag.indexOf(' ');
if (i === -1) {
var tagName = tag.slice(spos, tag.length - 1).trim();
} else {
var tagName = tag.slice(spos, i + 1).trim();
}
tagName = tagName.toLowerCase();
if (tagName in whiteList) {
// 过滤不合法的属性
if (i === -1) {
rethtml += tag.slice(0, spos) + tagName + '>';
} else {
var attrs = filterAttributes(tagName, tag.slice(i + 1, tag.length - 1).trim());
rethtml += tag.slice(0, spos) + tagName + (attrs.length > 0 ? ' ' + attrs : '') + '>';
}
} else {
// 过滤不合法的标签
var options = {
isClosing: (spos === 2),
position: rethtml.length,
originalPosition: currentPos - tag.length + 1
};
var tagHtml = onIgnoreTag(tagName, tag, options);
if (typeof(tagHtml) === 'undefined') {
tagHtml = noTag(tag);
}
rethtml += tagHtml;
}
};
// 逐个分析字符
for (var currentPos = 0, len = html.length; currentPos < len; currentPos++) {
var c = html[currentPos];
if (tagStart === false) {
if (c === '<') {
tagStart = currentPos;
continue;
}
} else {
if (quoteStart === false) {
if (c === '<') {
rethtml += noTag(html.slice(lastPos, currentPos));
tagStart = currentPos;
lastPos = currentPos;
continue;
}
if (c === '>') {
addNewTag(html.slice(tagStart, currentPos + 1), currentPos);
tagStart = false;
continue;
}
if (c === '"' || c === "'") {
quoteStart = c;
continue;
}
} else {
if (c === quoteStart) {
quoteStart = false;
continue;
}
}
}
}
if (lastPos < html.length) {
rethtml += noTag(html.substr(lastPos));
}
return rethtml;
};
// 默认配置
exports.whiteList = defaultWhiteList;
exports.onTagAttr = defaultOnTagAttr;
exports.onIgnoreTag = defaultOnIgnoreTag;
// 工具函数
exports.utils = require('./utils');
// 在浏览器端使用
if (typeof window !== 'undefined') {
window.filterXSS = module.exports;
}
},{"./utils":2}],2:[function(require,module,exports){/**
* 工具函数
*
* @author 老雷<leizongmin@gmail.com>
*/
var utils = module.exports;
/**
* 过滤代码块
*
* @param {array} tags 要隐藏的标签列表
* @param {function} next 对不在列表中的标签的处理函数
*/
utils.tagFilter = function (tags, next) {
if (typeof(next) !== 'function') {
next = function () {};
}
var hidden = [];
var posStart = false;
return {
onIgnoreTag: function (tag, html, options) {
if (tags.indexOf(tag) !== -1) {
var ret = '[removed]';
if (posStart !== false && options.isClosing) {
var end = options.position + ret.length;
hidden.push([posStart, end]);
posStart = false;
} else {
posStart = options.position;
}
return ret;
} else {
return next(tag, html, options);
}
},
filter: function (html) {
var rethtml = '';
var lastPos = 0;
hidden.forEach(function (pos) {
rethtml += html.slice(lastPos, pos[0]);
lastPos = pos[1];
});
rethtml += html.slice(lastPos);
return rethtml;
}
};
};
},{}]},{},[1]);