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Fix security flaw when linkTarget option contains _blank #398

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Fix security flaw when linkTarget option contains _blank #398

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c7b80e8
Fix security flaw when linkTarget option contains _blank
AntoineReneleau Oct 19, 2020
1b422de
refacto
AntoineReneleau Oct 19, 2020
f00c32a
Add test
AntoineReneleau Oct 20, 2020
424225b
Update misc.js
AntoineReneleau Oct 20, 2020
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8 changes: 6 additions & 2 deletions lib/rules.js
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Original file line number Diff line number Diff line change
Expand Up @@ -147,8 +147,12 @@ rules.paragraph_close = function(tokens, idx /*, options, env */) {

rules.link_open = function(tokens, idx, options /* env */) {
var title = tokens[idx].title ? (' title="' + escapeHtml(replaceEntities(tokens[idx].title)) + '"') : '';
var target = options.linkTarget ? (' target="' + options.linkTarget + '"') : '';
return '<a href="' + escapeHtml(tokens[idx].href) + '"' + title + target + '>';

var linkTarget = options.linkTarget;
var target = linkTarget ? (' target="' + options.linkTarget + '"') : '';
var rel = linkTarget && linkTarget.indexOf('_blank') !== -1 ? ' rel="noopener noreferrer"' : '';

return '<a href="' + escapeHtml(tokens[idx].href) + '"' + title + target + rel + '>';
};
rules.link_close = function(/* tokens, idx, options, env */) {
return '</a>';
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11 changes: 10 additions & 1 deletion test/misc.js
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Expand Up @@ -200,11 +200,20 @@ describe('Link target', function () {
});

it('Should add target to link when linkTarget is specified in options', function () {
var md = new Remarkable({ linkTarget: '_self' });

assert.strictEqual(
md.render('[test](http://example.com)'),
'<p><a href="http://example.com" target="_self">test</a></p>\n'
);
});

it('Should add rel attr when linkTarget contains _blank', function () {
var md = new Remarkable({ linkTarget: '_blank' });

assert.strictEqual(
md.render('[test](http://example.com)'),
'<p><a href="http://example.com" target="_blank">test</a></p>\n'
'<p><a href="http://example.com" target="_blank" rel="noopener noreferrer">test</a></p>\n'
);
});

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