Added sanitizer extension
This commit is contained in:
benweet
parent
81b37f3f1e
commit
3ccc267028
@ -24,8 +24,8 @@ define([
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"extensions/documentManager",
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"extensions/workingIndicator",
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"extensions/notifications",
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"extensions/umlDiagrams",
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"extensions/markdownExtra",
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"extensions/umlDiagrams",
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"extensions/toc",
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"extensions/mathJax",
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"extensions/emailConverter",
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@ -39,8 +39,9 @@ define([
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"extensions/shortcuts",
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"extensions/userCustom",
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"extensions/comments",
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"extensions/htmlSanitizer",
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"bootstrap",
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"jquery-waitforimages",
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"jquery-waitforimages"
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], function($, _, crel, utils, logger, Extension, settings, settingsExtensionsAccordionHTML) {
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var eventMgr = {};
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395
public/res/extensions/htmlSanitizer.js
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395
public/res/extensions/htmlSanitizer.js
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@ -0,0 +1,395 @@
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define([
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"jquery",
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"underscore",
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"utils",
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"logger",
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"classes/Extension",
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"text!html/htmlSanitizerSettingsBlock.html"
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], function($, _, utils, logger, Extension, htmlSanitizerSettingsBlockHTML) {
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var htmlSanitizer = new Extension("htmlSanitizer", "HTML Sanitizer", true);
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htmlSanitizer.settingsBlock = htmlSanitizerSettingsBlockHTML;
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var buf;
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htmlSanitizer.onPagedownConfigure = function(editor) {
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var converter = editor.getConverter();
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converter.hooks.chain("postConversion", function(html) {
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buf = [];
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html.split('<div class="se-preview-section-delimiter"></div>').forEach(function(sectionHtml) {
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try {
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htmlParser(sectionHtml, htmlSanitizeWriter(buf, function(uri, isImage) {
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return !/^unsafe/.test(sanitizeUri(uri, isImage));
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}));
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}
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catch(e) {
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}
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buf.push('<div class="se-preview-section-delimiter"></div>');
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});
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return buf.slice(0, -1).join('');
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});
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};
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/**
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* @license AngularJS v1.2.16
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* (c) 2010-2014 Google, Inc. http://angularjs.org
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* License: MIT
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*/
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var aHrefSanitizationWhitelist = /^\s*(https?|ftp|mailto|tel|file):/,
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imgSrcSanitizationWhitelist = /^\s*(https?|ftp|file):|data:image\//;
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function sanitizeUri(uri, isImage) {
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var regex = isImage ? imgSrcSanitizationWhitelist : aHrefSanitizationWhitelist;
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var normalizedVal;
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normalizedVal = utils.urlResolve(uri).href;
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if(normalizedVal !== '' && !normalizedVal.match(regex)) {
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return 'unsafe:' + normalizedVal;
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}
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}
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// Regular Expressions for parsing tags and attributes
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var START_TAG_REGEXP =
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/^<\s*([\w:-]+)((?:\s+[\w:-]+(?:\s*=\s*(?:(?:"[^"]*")|(?:'[^']*')|[^>\s]+))?)*)\s*(\/?)\s*>/,
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END_TAG_REGEXP = /^<\s*\/\s*([\w:-]+)[^>]*>/,
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ATTR_REGEXP = /([\w:-]+)(?:\s*=\s*(?:(?:"((?:[^"])*)")|(?:'((?:[^'])*)')|([^>\s]+)))?/g,
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BEGIN_TAG_REGEXP = /^</,
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BEGING_END_TAGE_REGEXP = /^<\s*\//,
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COMMENT_REGEXP = /<!--(.*?)-->/g,
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DOCTYPE_REGEXP = /<!DOCTYPE([^>]*?)>/i,
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CDATA_REGEXP = /<!\[CDATA\[(.*?)]]>/g,
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// Match everything outside of normal chars and " (quote character)
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NON_ALPHANUMERIC_REGEXP = /([^\#-~| |!])/g;
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function makeMap(str) {
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var obj = {}, items = str.split(','), i;
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for(i = 0; i < items.length; i++) {
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obj[items[i]] = true;
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}
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return obj;
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}
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// Good source of info about elements and attributes
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// http://dev.w3.org/html5/spec/Overview.html#semantics
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// http://simon.html5.org/html-elements
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// Safe Void Elements - HTML5
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// http://dev.w3.org/html5/spec/Overview.html#void-elements
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var voidElements = makeMap("area,br,col,hr,img,wbr");
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// Elements that you can, intentionally, leave open (and which close themselves)
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// http://dev.w3.org/html5/spec/Overview.html#optional-tags
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var optionalEndTagBlockElements = makeMap("colgroup,dd,dt,li,p,tbody,td,tfoot,th,thead,tr"),
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optionalEndTagInlineElements = makeMap("rp,rt"),
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optionalEndTagElements = _.extend({},
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optionalEndTagInlineElements,
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optionalEndTagBlockElements);
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// Safe Block Elements - HTML5
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var blockElements = _.extend({}, optionalEndTagBlockElements, makeMap("address,article," +
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"aside,blockquote,caption,center,del,dir,div,dl,figure,figcaption,footer,h1,h2,h3,h4,h5," +
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"h6,header,hgroup,hr,ins,map,menu,nav,ol,pre,script,section,table,ul"));
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// Inline Elements - HTML5
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var inlineElements = _.extend({}, optionalEndTagInlineElements, makeMap("a,abbr,acronym,b," +
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"bdi,bdo,big,br,cite,code,del,dfn,em,font,i,img,ins,kbd,label,map,mark,q,ruby,rp,rt,s," +
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"samp,small,span,strike,strong,sub,sup,time,tt,u,var"));
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// Special Elements (can contain anything)
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var specialElements = makeMap("script,style");
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var validElements = _.extend({},
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voidElements,
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blockElements,
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inlineElements,
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optionalEndTagElements);
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//Attributes that have href and hence need to be sanitized
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var uriAttrs = makeMap("background,cite,href,longdesc,src,usemap");
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var validAttrs = _.extend({}, uriAttrs, makeMap(
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'abbr,align,alt,axis,bgcolor,border,cellpadding,cellspacing,class,clear,' +
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'color,cols,colspan,compact,coords,dir,face,headers,height,hreflang,hspace,' +
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'ismap,lang,language,nohref,nowrap,rel,rev,rows,rowspan,rules,' +
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'scope,scrolling,shape,size,span,start,summary,target,title,type,' +
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'valign,value,vspace,width'));
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// benweet: Add id
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validAttrs.id = true;
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/*
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* HTML Parser By Misko Hevery (misko@hevery.com)
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* based on: HTML Parser By John Resig (ejohn.org)
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* Original code by Erik Arvidsson, Mozilla Public License
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* http://erik.eae.net/simplehtmlparser/simplehtmlparser.js
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*
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* // Use like so:
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* htmlParser(htmlString, {
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* start: function(tag, attrs, unary) {},
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* end: function(tag) {},
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* chars: function(text) {},
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* comment: function(text) {}
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* });
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*
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*/
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/* jshint -W083 */
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function htmlParser(html, handler) {
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var index, chars, match, stack = [], last = html;
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stack.last = function() {
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return stack[ stack.length - 1 ];
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};
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function parseStartTag(tag, tagName, rest, unary) {
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tagName = tagName && tagName.toLowerCase();
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if(blockElements[ tagName ]) {
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while(stack.last() && inlineElements[ stack.last() ]) {
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parseEndTag("", stack.last());
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}
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}
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if(optionalEndTagElements[ tagName ] && stack.last() == tagName) {
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parseEndTag("", tagName);
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}
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unary = voidElements[ tagName ] || !!unary;
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if(!unary) {
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stack.push(tagName);
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}
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var attrs = {};
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rest.replace(ATTR_REGEXP,
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function(match, name, doubleQuotedValue, singleQuotedValue, unquotedValue) {
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var value = doubleQuotedValue ||
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singleQuotedValue ||
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unquotedValue ||
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'';
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attrs[name] = decodeEntities(value);
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});
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if(handler.start) {
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handler.start(tagName, attrs, unary);
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}
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}
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function parseEndTag(tag, tagName) {
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var pos = 0, i;
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tagName = tagName && tagName.toLowerCase();
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if(tagName) {
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// Find the closest opened tag of the same type
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for(pos = stack.length - 1; pos >= 0; pos--) {
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if(stack[ pos ] == tagName) {
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break;
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}
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}
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}
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if(pos >= 0) {
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// Close all the open elements, up the stack
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for(i = stack.length - 1; i >= pos; i--) {
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if(handler.end) {
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handler.end(stack[ i ]);
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}
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}
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// Remove the open elements from the stack
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stack.length = pos;
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}
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}
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while(html) {
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chars = true;
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// Make sure we're not in a script or style element
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if(!stack.last() || !specialElements[ stack.last() ]) {
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// Comment
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if(html.indexOf("<!--") === 0) {
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// comments containing -- are not allowed unless they terminate the comment
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index = html.indexOf("--", 4);
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if(index >= 0 && html.lastIndexOf("-->", index) === index) {
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if(handler.comment) {
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handler.comment(html.substring(4, index));
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}
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html = html.substring(index + 3);
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chars = false;
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}
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// DOCTYPE
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} else if(DOCTYPE_REGEXP.test(html)) {
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match = html.match(DOCTYPE_REGEXP);
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if(match) {
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html = html.replace(match[0], '');
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chars = false;
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}
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// end tag
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} else if(BEGING_END_TAGE_REGEXP.test(html)) {
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match = html.match(END_TAG_REGEXP);
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if(match) {
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html = html.substring(match[0].length);
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match[0].replace(END_TAG_REGEXP, parseEndTag);
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chars = false;
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}
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// start tag
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} else if(BEGIN_TAG_REGEXP.test(html)) {
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match = html.match(START_TAG_REGEXP);
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if(match) {
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html = html.substring(match[0].length);
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match[0].replace(START_TAG_REGEXP, parseStartTag);
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chars = false;
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}
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}
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if(chars) {
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index = html.indexOf("<");
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var text = index < 0 ? html : html.substring(0, index);
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html = index < 0 ? "" : html.substring(index);
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if(handler.chars) {
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handler.chars(decodeEntities(text));
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}
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}
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} else {
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html = html.replace(new RegExp("(.*)<\\s*\\/\\s*" + stack.last() + "[^>]*>", 'i'),
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function(all, text) {
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text = text.replace(COMMENT_REGEXP, "$1").replace(CDATA_REGEXP, "$1");
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if(handler.chars) {
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handler.chars(decodeEntities(text));
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}
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return "";
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});
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parseEndTag("", stack.last());
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}
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if(html == last) {
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//throw new Error("The sanitizer was unable to parse the following block of html: " + html);
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stack.reverse();
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return stack.forEach(function(tag) {
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buf.push('</');
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buf.push(tag);
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buf.push('>');
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});
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}
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last = html;
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}
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// Clean up any remaining tags
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parseEndTag();
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}
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var hiddenPre = document.createElement("pre");
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var spaceRe = /^(\s*)([\s\S]*?)(\s*)$/;
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/**
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* decodes all entities into regular string
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* @param value
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* @returns {string} A string with decoded entities.
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*/
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function decodeEntities(value) {
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if(!value) {
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return '';
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}
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// Note: IE8 does not preserve spaces at the start/end of innerHTML
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// so we must capture them and reattach them afterward
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var parts = spaceRe.exec(value);
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var spaceBefore = parts[1];
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var spaceAfter = parts[3];
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var content = parts[2];
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if(content) {
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hiddenPre.innerHTML = content.replace(/</g, "<");
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// innerText depends on styling as it doesn't display hidden elements.
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// Therefore, it's better to use textContent not to cause unnecessary
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// reflows. However, IE<9 don't support textContent so the innerText
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// fallback is necessary.
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content = 'textContent' in hiddenPre ?
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hiddenPre.textContent : hiddenPre.innerText;
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}
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return spaceBefore + content + spaceAfter;
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}
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/**
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* Escapes all potentially dangerous characters, so that the
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* resulting string can be safely inserted into attribute or
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* element text.
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* @param value
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* @returns {string} escaped text
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*/
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function encodeEntities(value) {
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return value.
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replace(/&/g, '&').
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replace(NON_ALPHANUMERIC_REGEXP, function(value) {
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return '&#' + value.charCodeAt(0) + ';';
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}).
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replace(/</g, '<').
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replace(/>/g, '>');
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}
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/**
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* create an HTML/XML writer which writes to buffer
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* @param {Array} buf use buf.jain('') to get out sanitized html string
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* @returns {object} in the form of {
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* start: function(tag, attrs, unary) {},
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* end: function(tag) {},
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* chars: function(text) {},
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* comment: function(text) {}
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* }
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*/
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function htmlSanitizeWriter(buf, uriValidator) {
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var ignore = false;
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var out = _.bind(buf.push, buf);
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return {
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start: function(tag, attrs, unary) {
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tag = tag && tag.toLowerCase();
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if(!ignore && specialElements[tag]) {
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ignore = tag;
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}
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if(!ignore && validElements[tag] === true) {
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out('<');
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out(tag);
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_.forEach(attrs, function(value, key) {
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var lkey = key && key.toLowerCase();
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var isImage = (tag === 'img' && lkey === 'src') || (lkey === 'background');
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if(validAttrs[lkey] === true &&
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(uriAttrs[lkey] !== true || uriValidator(value, isImage))) {
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out(' ');
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out(key);
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out('="');
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out(encodeEntities(value));
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out('"');
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}
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});
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out(unary ? '/>' : '>');
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}
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},
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end: function(tag) {
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tag = tag && tag.toLowerCase();
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if(!ignore && validElements[tag] === true) {
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out('</');
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out(tag);
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out('>');
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}
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if(tag == ignore) {
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ignore = false;
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}
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},
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chars: function(chars) {
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if(!ignore) {
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out(encodeEntities(chars));
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}
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}
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};
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}
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return htmlSanitizer;
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});
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2
public/res/html/htmlSanitizerSettingsBlock.html
Normal file
2
public/res/html/htmlSanitizerSettingsBlock.html
Normal file
@ -0,0 +1,2 @@
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<p>Prevents cross-site-scripting attacks (XSS).</p>
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<p class="alert alert-danger"><i class="icon-attention"></i> <b>Careful:</b> Disable at your own risk!</p>
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Reference in New Issue
Block a user