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Properly fix #622 by escaping input into DOM filters

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This commit is contained in:
Lorenz Hübschle-Schneider 2015-06-08 23:35:18 +02:00
parent bdb968d3af
commit cfad82ec3e
2 changed files with 17 additions and 23 deletions
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4
index.html
View file

@ -21,7 +21,7 @@
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular-sanitize.min.js"></script>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular-touch.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.7.0/underscore-min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/emojione/1.3.0/lib/js/emojione.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/emojione/1.4.0/lib/js/emojione.min.js"></script>
<script type="text/javascript" src="3rdparty/inflate.min.js"></script>
<script type="text/javascript" src="js/localstorage.js"></script>
<script type="text/javascript" src="js/weechat.js"></script>
@ -284,7 +284,7 @@ $ openssl req -nodes -newkey rsa:4096 -keyout relay.pem -x509 -days 365 -out rel
<td class="prefix"><a ng-click="addMention(bufferline.prefix)"><span class="hidden-bracket">&lt;</span><span ng-repeat="part in ::bufferline.prefix" ng-class="::part.classes" ng-bind="::part.text|prefixlimit:25"></span><span class="hidden-bracket">&gt;</span></a></td><!--
--><td class="message"><!--
--><div ng-repeat="metadata in ::bufferline.metadata" plugin data="::metadata"></div><!--
--><span ng-repeat="part in ::bufferline.content" class="text" ng-class="::part.classes.concat(['line-' + part.$$hashKey.replace(':','_')])" ng-bind-html="::part.text | escape | linky:'_blank' | DOMfilter:'irclinky' | DOMfilter:'emojify':settings.enableJSEmoji | DOMfilter:'inlinecolour' | DOMfilter:'mathjax':('.line-' + part.$$hashKey.replace(':','_')):settings.enableMathjax"></span>
--><span ng-repeat="part in ::bufferline.content" class="text" ng-class="::part.classes.concat(['line-' + part.$$hashKey.replace(':','_')])" ng-bind-html="::part.text | linky:'_blank' | DOMfilter:'irclinky' | DOMfilter:'emojify':settings.enableJSEmoji | DOMfilter:'inlinecolour' | DOMfilter:'mathjax':('.line-' + part.$$hashKey.replace(':','_')):settings.enableMathjax"></span>
</td>
</tr>
<tr class="readmarker" ng-if="activeBuffer().lastSeen==$index">

36
js/filters.js
View file

@ -30,13 +30,6 @@ weechat.filter('irclinky', ['$filter', function($filter) {
return text;
}
// First, escape entities to prevent escaping issues because it's a bad idea
// to parse/modify HTML with regexes, which we do a couple of lines down...
var entities = {"<": "&lt;", ">": "&gt;", '"': '&quot;', "'": '&#39;', "&": "&amp;", "/": '&#x2F;'};
text = text.replace(/[<>"'&\/]/g, function (char) {
return entities[char];
});
// This regex in no way matches all IRC channel names (they could also begin with &, + or an
// exclamation mark followed by 5 alphanumeric characters, and are bounded in length by 50).
// However, it matches all *common* IRC channels while trying to minimise false positives.
@ -73,6 +66,15 @@ weechat.filter('DOMfilter', ['$filter', '$sce', function($filter, $sce) {
return text;
}
var escape_html = function(text) {
// First, escape entities to prevent escaping issues because it's a bad idea
// to parse/modify HTML with regexes, which we do a couple of lines down...
var entities = {"<": "&lt;", ">": "&gt;", '"': '&quot;', "'": '&#39;', "&": "&amp;", "/": '&#x2F;'};
return text.replace(/[<>"'&\/]/g, function (char) {
return entities[char];
});
};
// hacky way to pass extra arguments without using .apply, which
// would require assembling an argument array. PERFORMANCE!!!
var extraArgument = (arguments.length > 2) ? arguments[2] : null;
@ -85,8 +87,12 @@ weechat.filter('DOMfilter', ['$filter', '$sce', function($filter, $sce) {
// Recursive DOM-walking function applying the filter to the text nodes
var process = function(node) {
if (node.nodeType === 3) { // text node
var value = filterFunction(node.nodeValue, extraArgument, thirdArgument);
if (value !== node.nodeValue) {
// apply the filter to *escaped* HTML, and only commit changes if
// it changed the escaped value. This is because setting the result
// as innerHTML causes it to be unescaped.
var input = escape_html(node.nodeValue);
var value = filterFunction(input, extraArgument, thirdArgument);
if (value !== input) {
// we changed something. create a new node to replace the current one
// we could also only add its children but that would probably incur
// more overhead than it would gain us
@ -141,18 +147,6 @@ weechat.filter('getBufferQuickKeys', function () {
};
});
weechat.filter('escape', ['$sanitize', function($sanitize) {
return function(text) {
// manual escaping because ng-sanitize is shit
return text
.replace(/&/g, "&amp;")
.replace(/</g, "&lt;")
.replace(/>/g, "&gt;")
.replace(/"/g, "&quot;")
.replace(/'/g, "&#039;");
};
}]);
// Emojifis the string using https://github.com/Ranks/emojione
weechat.filter('emojify', function() {
return function(text, enable_JS_Emoji) {