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Revert "Try to move sanitisation & links into setElementText"

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This reverts commit 8d2e19f791.
This commit is contained in:
rugk 2017-11-22 16:48:54 +01:00
parent 8d2e19f791
commit 56f4ee5c20
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GPG key ID: 05D40A636AFAB34D
2 changed files with 96 additions and 83 deletions
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139
js/privatebin.js
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@ -43,6 +43,26 @@ jQuery.PrivateBin = function($, sjcl, Base64, RawDeflate) {
var Helper = (function () {
var me = {};
/**
* character to HTML entity lookup table
*
* @see {@link https://github.com/janl/mustache.js/blob/master/mustache.js#L60}
* @name Helper.entityMap
* @private
* @enum {Object}
* @readonly
*/
var entityMap = {
'&': '&',
'<': '&lt;',
'>': '&gt;',
'"': '&quot;',
"'": '&#39;',
'/': '&#x2F;',
'`': '&#x60;',
'=': '&#x3D;'
};
/**
* cache for script location
*
@ -52,36 +72,6 @@ jQuery.PrivateBin = function($, sjcl, Base64, RawDeflate) {
*/
var baseUri = null;
/**
* convert URLs to clickable links.
* URLs to handle:
* <pre>
* magnet:?xt.1=urn:sha1:YNCKHTQCWBTRNJIV4WNAE52SJUQCZO5C&xt.2=urn:sha1:TXGCZQTH26NL6OUQAJJPFALHG2LTGBC7
* http://example.com:8800/zero/?6f09182b8ea51997#WtLEUO5Epj9UHAV9JFs+6pUQZp13TuspAUjnF+iM+dM=
* http://user:example.com@localhost:8800/zero/?6f09182b8ea51997#WtLEUO5Epj9UHAV9JFs+6pUQZp13TuspAUjnF+iM+dM=
* </pre>
* Attention: Does *not* sanitize HTML code! It is strongly advised to sanitize it after running this function.
*
*
* @name Helper.urls2links
* @function
* @param {String} html - HTML code
*/
urls2links = function(html)
{
var markup = '<a href="$1" rel="nofollow">$1</a>';
// short test: https://regex101.com/r/AttfVd/1
html.replace(
/((http|https|ftp):\/\/[\w?=&.\/-;#@~%+*-]+(?![\w\s?&.\/;#~%"=-]*>))/ig,
markup
)
// shorttest: https://regex101.com/r/sCm8Xe/2
html.replace(
/((magnet):[\w?=&.\/-;#@~%+*-]+)/ig,
markup
);
}
/**
* converts a duration (in seconds) into human friendly approximation
*
@ -145,38 +135,55 @@ jQuery.PrivateBin = function($, sjcl, Base64, RawDeflate) {
}
/**
* set text of a jQuery element (required for IE)
* set text of a jQuery element (required for IE),
*
* @name Helper.setElementText
* @function
* @param {jQuery} $element - a jQuery element
* @param {string} text - the text to enter
* @param {bool} convertLinks - whether to convert the links in the text
*/
me.setElementText = function($element, text, convertLinks)
me.setElementText = function($element, text)
{
var isIe = $('#oldienotice').is(':visible');
// text-only and no IE -> fast way: set text-only
if ((convertLinks === false) && isIe === false) {
return $element.text(text);
// For IE<10: Doesn't support white-space:pre-wrap; so we have to do this...
if ($('#oldienotice').is(':visible')) {
var html = me.htmlEntities(text).replace(/\n/ig, '\r\n<br>');
$element.html('<pre>' + html + '</pre>');
}
// convert text to plain-text
// but as we need to handle HTML code afterwards
var html = $(text).text();
if (convertLinks === true) {
html = me.urls2links(html);
// for other (sane) browsers:
else
{
$element.text(text);
}
}
// workaround: IE<10 doesn't support white-space:pre-wrap; so we have to do this...
if (isIe) {
html = html.replace(/\n/ig, '\r\n<br>');
}
// finally sanitize it for security (XSS) reasons
html = me.sanitizeHtml(text);
$element.html(html);
/**
* convert URLs to clickable links.
* URLs to handle:
* <pre>
* magnet:?xt.1=urn:sha1:YNCKHTQCWBTRNJIV4WNAE52SJUQCZO5C&xt.2=urn:sha1:TXGCZQTH26NL6OUQAJJPFALHG2LTGBC7
* http://example.com:8800/zero/?6f09182b8ea51997#WtLEUO5Epj9UHAV9JFs+6pUQZp13TuspAUjnF+iM+dM=
* http://user:example.com@localhost:8800/zero/?6f09182b8ea51997#WtLEUO5Epj9UHAV9JFs+6pUQZp13TuspAUjnF+iM+dM=
* </pre>
*
* @name Helper.urls2links
* @function
* @param {Object} $element - a jQuery DOM element
*/
me.urls2links = function($element)
{
var markup = '<a href="$1" rel="nofollow">$1</a>';
$element.html(
$element.html().replace(
/((http|https|ftp):\/\/[\w?=&.\/-;#@~%+*-]+(?![\w\s?&.\/;#~%"=-]*>))/ig,
markup
)
);
$element.html(
$element.html().replace(
/((magnet):[\w?=&.\/-;#@~%+*-]+)/ig,
markup
)
);
}
/**
@ -263,17 +270,19 @@ jQuery.PrivateBin = function($, sjcl, Base64, RawDeflate) {
}
/**
* sanitizes html code to prevent XSS attacks
* convert all applicable characters to HTML entities
*
* Now uses DOMPurify instead of some self-made stuff for security reasons.
*
* @name Helper.sanitizeHtml
* @see {@link https://www.owasp.org/index.php/XSS_(Cross_Site_Scripting)_Prevention_Cheat_Sheet#RULE_.231_-_HTML_Escape_Before_Inserting_Untrusted_Data_into_HTML_Element_Content}
* @name Helper.htmlEntities
* @function
* @param {string} str
* @return {string} escaped HTML
*/
me.sanitizeHtml = function(str) {
return DOMPurify.sanitize(str, {SAFE_FOR_JQUERY: true});
me.htmlEntities = function(str) {
return String(str).replace(
/[&<>"'`=\/]/g, function(s) {
return entityMap[s];
});
}
/**
@ -1757,8 +1766,9 @@ jQuery.PrivateBin = function($, sjcl, Base64, RawDeflate) {
}
// set text
Helper.setElementText($plainText, text, false);
Helper.setElementText($prettyPrint, text, true);
var sanitizedText = DOMPurify.sanitize(text, {SAFE_FOR_JQUERY: true})
Helper.setElementText($plainText, sanitizedText);
Helper.setElementText($prettyPrint, sanitizedText);
switch (format) {
case 'markdown':
@ -1783,12 +1793,15 @@ jQuery.PrivateBin = function($, sjcl, Base64, RawDeflate) {
$prettyPrint.html(
prettyPrintOne(
Helper.sanitizeHtml(text), null, true
Helper.htmlEntities(sanitizedText), null, true
)
);
// fall through, as the rest is the same
default: // = 'plaintext'
// adjust CSS so it looks good
// convert URLs to clickable links
Helper.urls2links($plainText);
Helper.urls2links($prettyPrint);
$prettyPrint.css('white-space', 'pre-wrap');
$prettyPrint.css('word-break', 'normal');
$prettyPrint.removeClass('prettyprint');
@ -2581,7 +2594,7 @@ jQuery.PrivateBin = function($, sjcl, Base64, RawDeflate) {
for (var i = 0; i < $head.length; i++) {
newDoc.write($head[i].outerHTML);
}
newDoc.write('</head><body><pre>' + Helper.sanitizeHtml(paste) + '</pre></body></html>');
newDoc.write('</head><body><pre>' + Helper.htmlEntities(paste) + '</pre></body></html>');
newDoc.close();
}