Add custom protocol whitelisting to SanitizationFilter
Addresses internal https://dev.gitlab.org/gitlab/gitlabhq/issues/2613
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@ -48,6 +48,12 @@ module Gitlab
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# Allow span elements
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whitelist[:elements].push('span')
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# Allow any protocol in `a` elements...
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whitelist[:protocols].delete('a')
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# ...but then remove links with the `javascript` protocol
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whitelist[:transformers].push(remove_javascript_links)
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# Remove `rel` attribute from `a` elements
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whitelist[:transformers].push(remove_rel)
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@ -57,6 +63,19 @@ module Gitlab
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whitelist
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end
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def remove_javascript_links
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lambda do |env|
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node = env[:node]
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return unless node.name == 'a'
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return unless node.has_attribute?('href')
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if node['href'].start_with?('javascript', ':javascript')
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node.remove_attribute('href')
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end
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end
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end
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def remove_rel
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lambda do |env|
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if env[:node_name] == 'a'
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@ -44,7 +44,7 @@ module Gitlab::Markdown
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instance = described_class.new('Foo')
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3.times { instance.whitelist }
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expect(instance.whitelist[:transformers].size).to eq 4
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expect(instance.whitelist[:transformers].size).to eq 5
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end
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it 'allows syntax highlighting' do
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@ -77,19 +77,100 @@ module Gitlab::Markdown
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end
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it 'removes `rel` attribute from `a` elements' do
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doc = filter(%q{<a href="#" rel="nofollow">Link</a>})
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act = %q{<a href="#" rel="nofollow">Link</a>}
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exp = %q{<a href="#">Link</a>}
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expect(doc.css('a').size).to eq 1
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expect(doc.at_css('a')['href']).to eq '#'
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expect(doc.at_css('a')['rel']).to be_nil
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expect(filter(act).to_html).to eq exp
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end
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it 'removes script-like `href` attribute from `a` elements' do
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html = %q{<a href="javascript:alert('Hi')">Hi</a>}
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doc = filter(html)
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# Adapted from the Sanitize test suite: http://git.io/vczrM
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protocols = {
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'protocol-based JS injection: simple, no spaces' => {
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input: '<a href="javascript:alert(\'XSS\');">foo</a>',
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output: '<a>foo</a>'
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},
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expect(doc.css('a').size).to eq 1
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expect(doc.at_css('a')['href']).to be_nil
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'protocol-based JS injection: simple, spaces before' => {
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input: '<a href="javascript :alert(\'XSS\');">foo</a>',
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output: '<a>foo</a>'
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},
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'protocol-based JS injection: simple, spaces after' => {
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input: '<a href="javascript: alert(\'XSS\');">foo</a>',
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output: '<a>foo</a>'
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},
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'protocol-based JS injection: simple, spaces before and after' => {
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input: '<a href="javascript : alert(\'XSS\');">foo</a>',
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output: '<a>foo</a>'
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},
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'protocol-based JS injection: preceding colon' => {
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input: '<a href=":javascript:alert(\'XSS\');">foo</a>',
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output: '<a>foo</a>'
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},
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'protocol-based JS injection: UTF-8 encoding' => {
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input: '<a href="javascript:">foo</a>',
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output: '<a>foo</a>'
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},
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'protocol-based JS injection: long UTF-8 encoding' => {
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input: '<a href="javascript:">foo</a>',
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output: '<a>foo</a>'
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},
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'protocol-based JS injection: long UTF-8 encoding without semicolons' => {
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input: '<a href=javascript:alert('XSS')>foo</a>',
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output: '<a>foo</a>'
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},
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'protocol-based JS injection: hex encoding' => {
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input: '<a href="javascript:">foo</a>',
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output: '<a>foo</a>'
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},
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'protocol-based JS injection: long hex encoding' => {
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input: '<a href="javascript:">foo</a>',
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output: '<a>foo</a>'
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},
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'protocol-based JS injection: hex encoding without semicolons' => {
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input: '<a href=javascript:alert('XSS')>foo</a>',
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output: '<a>foo</a>'
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},
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'protocol-based JS injection: null char' => {
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input: "<a href=java\0script:alert(\"XSS\")>foo</a>",
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output: '<a href="java"></a>'
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},
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'protocol-based JS injection: spaces and entities' => {
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input: '<a href="  javascript:alert(\'XSS\');">foo</a>',
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output: '<a href="">foo</a>'
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},
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}
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protocols.each do |name, data|
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it "handles #{name}" do
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doc = filter(data[:input])
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expect(doc.to_html).to eq data[:output]
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end
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end
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it 'allows non-standard anchor schemes' do
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exp = %q{<a href="irc://irc.freenode.net/git">IRC</a>}
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act = filter(exp)
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expect(act.to_html).to eq exp
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end
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it 'allows relative links' do
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exp = %q{<a href="foo/bar.md">foo/bar.md</a>}
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act = filter(exp)
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expect(act.to_html).to eq exp
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end
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end
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