ASP防XSS代码
原作是在GitHub上，基于Node.js所写。但是。。ASP的JS引擎跟V8又有些不同。。于是，嗯。。
<%
Function AntiXSS_VbsTrim(s)
AntiXSS_VbsTrim=Trim(s)
End Function
%>
<script language="javascript" runat="server">
//原GITHUB：https://github.com/leizongmin/js-xss/blob/master/index.js
//过滤XSS攻击 @author 老雷<leizongmin@gmail.com>
//转换到ASP by zsx(http://www.zsxsoft.com)
function AntiXSS_run(html){
String.prototype.trim=function(){return AntiXSS_VbsTrim(this)};
return AntiXSS(html,AntiXSS_config);
}
var AntiXSS_noTag = function(text) {
return text.replace(/</g, '<').replace(/>/g, '>');
};
function AntiXSS(html, options) {
var whiteList = options.whiteList;
var onTagAttr = options.onTagAttr;
var onIgnoreTag = options.onIgnoreTag;
var rethtml = '';
var lastPos = 0;
var tagStart = false;
var quoteStart = false;
var currentPos = 0;
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.join().indexOf(name) !== -1) {
if (value) {
value = value.trim().replace(/"/g, '"e;');
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.split("")[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.split("")[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(' ');
};
var addNewTag = function(tag, end) {
rethtml += AntiXSS_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) {
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 {
var options = {
isClosing: (spos === 2),
position: rethtml.length,
originalPosition: currentPos - tag.length + 1
};
var tagHtml = onIgnoreTag(tagName, tag, options);
if (typeof(tagHtml) === 'undefined') {
tagHtml = AntiXSS_noTag(tag);
}
rethtml += tagHtml;
}
};
for (var currentPos = 0, len = html.length; currentPos < len; currentPos++) {
var c = html.split("")[currentPos];
if (tagStart === false) {
if (c === '<') {
tagStart = currentPos;
continue;
}
} else {
if (quoteStart === false) {
if (c === '<') {
rethtml += AntiXSS_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 += AntiXSS_noTag(html.substr(lastPos));
}
return rethtml;
};
var AntiXSS_config = {
"whiteList": {
// 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' ,'rel'],
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']
},
"onTagAttr": 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 '';
}
}
},
"onIgnoreTag": function(tag, html, options) {
return AntiXSS_noTag(html);
}
};
</script>
