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Try to move sanitisation & links into setElementText

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rugk 2017-11-22 16:48:00 +01:00
parent 3d2dbabaec
commit 8d2e19f791
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GPG key ID: 05D40A636AFAB34D
2 changed files with 84 additions and 97 deletions
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141
js/privatebin.js
View file

@ -43,26 +43,6 @@ jQuery.PrivateBin = function($, sjcl, Base64, RawDeflate) {
var Helper = (function () {
var me = {};
/**
* character to HTML entity lookup table
*
* @see {@link https://github.com/janl/mustache.js/blob/master/mustache.js#L60}
* @name Helper.entityMap
* @private
* @enum {Object}
* @readonly
*/
var entityMap = {
'&': '&',
'<': '&lt;',
'>': '&gt;',
'"': '&quot;',
"'": '&#39;',
'/': '&#x2F;',
'`': '&#x60;',
'=': '&#x3D;'
};
/**
* cache for script location
*
@ -72,6 +52,36 @@ jQuery.PrivateBin = function($, 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">$1</a>';
// short test: https://regex101.com/r/AttfVd/1
html.replace(
/((http|https|ftp):\/\/[\w?=&.\/-;#@~%+*-]+(?![\w\s?&.\/;#~%"=-]*>))/ig,
markup
)
// shorttest: https://regex101.com/r/sCm8Xe/2
html.replace(
/((magnet):[\w?=&.\/-;#@~%+*-]+)/ig,
markup
);
}
/**
* converts a duration (in seconds) into human friendly approximation
*
@ -135,55 +145,38 @@ jQuery.PrivateBin = function($, 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)
me.setElementText = function($element, text, convertLinks)
{
// For IE<10: Doesn't support white-space:pre-wrap; so we have to do this...
if ($('#oldienotice').is(':visible')) {
var html = me.htmlEntities(text).replace(/\n/ig, '\r\n<br>');
$element.html('<pre>' + html + '</pre>');
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 other (sane) browsers:
else
{
$element.text(text);
}
}
/**
* 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
)
);
// 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);
}
// 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);
$element.html(html);
}
/**
@ -270,19 +263,17 @@ jQuery.PrivateBin = function($, sjcl, Base64, RawDeflate) {
}
/**
* convert all applicable characters to HTML entities
* sanitizes html code to prevent XSS attacks
*
* @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
* Now uses DOMPurify instead of some self-made stuff for security reasons.
*
* @name Helper.sanitizeHtml
* @function
* @param {string} str
* @return {string} escaped HTML
*/
me.htmlEntities = function(str) {
return String(str).replace(
/[&<>"'`=\/]/g, function(s) {
return entityMap[s];
});
me.sanitizeHtml = function(str) {
return DOMPurify.sanitize(str, {SAFE_FOR_JQUERY: true});
}
/**
@ -1766,9 +1757,8 @@ jQuery.PrivateBin = function($, sjcl, Base64, RawDeflate) {
}
// set text
var sanitizedText = DOMPurify.sanitize(text, {SAFE_FOR_JQUERY: true})
Helper.setElementText($plainText, sanitizedText);
Helper.setElementText($prettyPrint, sanitizedText);
Helper.setElementText($plainText, text, false);
Helper.setElementText($prettyPrint, text, true);
switch (format) {
case 'markdown':
@ -1793,15 +1783,12 @@ jQuery.PrivateBin = function($, sjcl, Base64, RawDeflate) {
$prettyPrint.html(
prettyPrintOne(
Helper.htmlEntities(sanitizedText), null, true
Helper.sanitizeHtml(text), null, true
)
);
// fall through, as the rest is the same
default: // = 'plaintext'
// convert URLs to clickable links
Helper.urls2links($plainText);
Helper.urls2links($prettyPrint);
// adjust CSS so it looks good
$prettyPrint.css('white-space', 'pre-wrap');
$prettyPrint.css('word-break', 'normal');
$prettyPrint.removeClass('prettyprint');
@ -2594,7 +2581,7 @@ jQuery.PrivateBin = function($, sjcl, Base64, RawDeflate) {
for (var i = 0; i < $head.length; i++) {
newDoc.write($head[i].outerHTML);
}
newDoc.write('</head><body><pre>' + Helper.htmlEntities(paste) + '</pre></body></html>');
newDoc.write('</head><body><pre>' + Helper.sanitizeHtml(paste) + '</pre></body></html>');
newDoc.close();
}

40
js/test.js
View file

@ -93,7 +93,7 @@ describe('Helper', function () {
var html = '',
result = true;
ids.forEach(function(item, i) {
html += '<div id="' + item.join('') + '">' + $.PrivateBin.Helper.htmlEntities(contents[i] || contents[0]) + '</div>';
html += '<div id="' + item.join('') + '">' + $.PrivateBin.Helper.sanitizeHtml(contents[i] || contents[0]) + '</div>';
});
var clean = jsdom(html);
ids.forEach(function(item, i) {
@ -122,7 +122,7 @@ describe('Helper', function () {
var html = '',
result = true;
ids.forEach(function(item, i) {
html += '<div id="' + item.join('') + '">' + $.PrivateBin.Helper.htmlEntities(contents[i] || contents[0]) + '</div>';
html += '<div id="' + item.join('') + '">' + $.PrivateBin.Helper.sanitizeHtml(contents[i] || contents[0]) + '</div>';
});
var elements = $('<body />').html(html);
ids.forEach(function(item, i) {
@ -163,9 +163,9 @@ describe('Helper', function () {
var query = query.join(''),
fragment = fragment.join(''),
url = schema + '://' + address.join('') + '/?' + query + '#' + fragment,
prefix = $.PrivateBin.Helper.htmlEntities(prefix),
postfix = ' ' + $.PrivateBin.Helper.htmlEntities(postfix),
element = $('<div>' + prefix + url + postfix + '</div>');
prefix = $.PrivateBin.Helper.sanitizeHtml(prefix),
postfix = ' ' + $.PrivateBin.Helper.sanitizeHtml(postfix),
element = '<div>' + prefix + url + postfix + '</div>';
// special cases: When the query string and fragment imply the beginning of an HTML entity, eg. &#0 or &#x
if (
@ -175,11 +175,11 @@ describe('Helper', function () {
{
url = schema + '://' + address.join('') + '/?' + query.substring(0, query.length - 1);
postfix = '';
element = $('<div>' + prefix + url + '</div>');
element = '<div>' + prefix + url + '</div>';
}
$.PrivateBin.Helper.urls2links(element);
return element.html() === $('<div>' + prefix + '<a href="' + url + '" rel="nofollow">' + url + '</a>' + postfix + '</div>').html();
return element.html() === '<div>' + prefix + '<a href="' + url + '" rel="nofollow">' + url + '</a>' + postfix + '</div>';
}
);
jsc.property(
@ -189,8 +189,8 @@ describe('Helper', function () {
'string',
function (prefix, query, postfix) {
var url = 'magnet:?' + query.join('').replace(/^&+|&+$/gm,''),
prefix = $.PrivateBin.Helper.htmlEntities(prefix),
postfix = $.PrivateBin.Helper.htmlEntities(postfix),
prefix = $.PrivateBin.Helper.sanitizeHtml(prefix),
postfix = $.PrivateBin.Helper.sanitizeHtml(postfix),
element = $('<div>' + prefix + url + ' ' + postfix + '</div>');
$.PrivateBin.Helper.urls2links(element);
return element.html() === $('<div>' + prefix + '<a href="' + url + '" rel="nofollow">' + url + '</a> ' + postfix + '</div>').html();
@ -329,7 +329,7 @@ describe('Helper', function () {
);
});
describe('htmlEntities', function () {
describe('sanitizeHtml', function () {
after(function () {
cleanup();
});
@ -338,7 +338,7 @@ describe('Helper', function () {
'removes all HTML entities from any given string',
'string',
function (string) {
var result = $.PrivateBin.Helper.htmlEntities(string);
var result = $.PrivateBin.Helper.sanitizeHtml(string);
return !(/[<>"'`=\/]/.test(result)) && !(string.indexOf('&') > -1 && !(/&amp;/.test(result)));
}
);
@ -583,8 +583,8 @@ describe('Model', function () {
'string',
'small nat',
function (keys, value, key) {
keys = keys.map($.PrivateBin.Helper.htmlEntities);
value = $.PrivateBin.Helper.htmlEntities(value);
keys = keys.map($.PrivateBin.Helper.sanitizeHtml);
value = $.PrivateBin.Helper.sanitizeHtml(value);
var content = keys.length > key ? keys[key] : (keys.length > 0 ? keys[0] : 'null'),
contents = '<select id="pasteExpiration" name="pasteExpiration">';
keys.forEach(function(item) {
@ -596,7 +596,7 @@ describe('Model', function () {
});
contents += '</select>';
$('body').html(contents);
var result = $.PrivateBin.Helper.htmlEntities(
var result = $.PrivateBin.Helper.sanitizeHtml(
$.PrivateBin.Model.getExpirationDefault()
);
$.PrivateBin.Model.reset();
@ -617,8 +617,8 @@ describe('Model', function () {
'string',
'small nat',
function (keys, value, key) {
keys = keys.map($.PrivateBin.Helper.htmlEntities);
value = $.PrivateBin.Helper.htmlEntities(value);
keys = keys.map($.PrivateBin.Helper.sanitizeHtml);
value = $.PrivateBin.Helper.sanitizeHtml(value);
var content = keys.length > key ? keys[key] : (keys.length > 0 ? keys[0] : 'null'),
contents = '<select id="pasteFormatter" name="pasteFormatter">';
keys.forEach(function(item) {
@ -630,7 +630,7 @@ describe('Model', function () {
});
contents += '</select>';
$('body').html(contents);
var result = $.PrivateBin.Helper.htmlEntities(
var result = $.PrivateBin.Helper.sanitizeHtml(
$.PrivateBin.Model.getFormatDefault()
);
$.PrivateBin.Model.reset();
@ -649,7 +649,7 @@ describe('Model', function () {
'checks if the element with id "cipherdata" contains any data',
'asciistring',
function (value) {
value = $.PrivateBin.Helper.htmlEntities(value).trim();
value = $.PrivateBin.Helper.sanitizeHtml(value).trim();
$('body').html('<div id="cipherdata">' + value + '</div>');
$.PrivateBin.Model.init();
var result = $.PrivateBin.Model.hasCipherData();
@ -669,10 +669,10 @@ describe('Model', function () {
'returns the contents of the element with id "cipherdata"',
'asciistring',
function (value) {
value = $.PrivateBin.Helper.htmlEntities(value).trim();
value = $.PrivateBin.Helper.sanitizeHtml(value).trim();
$('body').html('<div id="cipherdata">' + value + '</div>');
$.PrivateBin.Model.init();
var result = $.PrivateBin.Helper.htmlEntities(
var result = $.PrivateBin.Helper.sanitizeHtml(
$.PrivateBin.Model.getCipherData()
);
$.PrivateBin.Model.reset();