Commit 21d89d02 authored by Stan Hu's avatar Stan Hu
Browse files

Update SVG sanitizer to conform to SVG 1.1

Use a custom Loofah scrubber since sanitize 2.x transformers are inadequate
to handle case-sensitive SVG attributes. sanitize parses documents as HTML
instead of XML, which causes all SVG attribute names (e.g. viewBox) to be downcased.

* SVG element list: https://www.w3.org/TR/SVG/eltindex.html
* SVG attribute list: https://www.w3.org/TR/SVG/attindex.html

Closes #14555
parent 2e116227
......@@ -15,6 +15,7 @@ v 8.8.0 (unreleased)
- Use ActionDispatch Remote IP for Akismet checking
- Fix error when visiting commit builds page before build was updated
- Add 'l' shortcut to open Label dropdown on issuables and 'i' to create new issue on a project
- Update SVG sanitizer to conform to SVG 1.1
- Updated search UI
- Display informative message when new milestone is created
- Allow "NEWS" and "CHANGES" as alternative names for CHANGELOG. !3768 (Connor Shea)
......
......@@ -131,7 +131,7 @@ def blob_size(blob)
# elements and attributes. Note that this whitelist is by no means complete
# and may omit some elements.
def sanitize_svg(blob)
blob.data = Loofah.scrub_fragment(blob.data, :strip).to_xml
blob.data = Gitlab::Sanitizers::SVG.clean(blob.data)
blob
end
......
require_relative "svg/whitelist"
module Gitlab
module Sanitizers
module SVG
def self.clean(data)
Loofah.xml_document(data).scrub!(Scrubber.new).to_s
end
class Scrubber < Loofah::Scrubber
# http://www.whatwg.org/specs/web-apps/current-work/multipage/elements.html#embedding-custom-non-visible-data-with-the-data-*-attributes
DATA_ATTR_PATTERN = /\Adata-(?!xml)[a-z_][\w.\u00E0-\u00F6\u00F8-\u017F\u01DD-\u02AF-]*\z/u
def scrub(node)
unless ALLOWED_ELEMENTS.include?(node.name)
node.unlink
else
node.attributes.each do |attr_name, attr|
valid_attributes = ALLOWED_ATTRIBUTES[node.name]
unless valid_attributes && valid_attributes.include?(attr_name)
if ALLOWED_DATA_ATTRIBUTES_IN_ELEMENTS.include?(node.name) &&
attr_name.start_with?('data-')
# Arbitrary data attributes are allowed. Verify that the attribute
# is a valid data attribute.
attr.unlink unless attr_name =~ DATA_ATTR_PATTERN
else
attr.unlink
end
end
end
end
end
end
end
end
end
This diff is collapsed.
<?xml version="1.0"?>
<svg xmlns="http://www.w3.org/2000/svg" id="Layer_1" data-name="Layer 1" viewBox="0 0 622 682">
<defs>
<style>.cls-1{fill:#30353e;}.cls-2{fill:#8c929d;}.cls-3{fill:#fc6d26;}.cls-4{fill:#e24329;}.cls-5{fill:#fca326;}</style>
</defs>
<title>stacked_wm</title>
<path id="bg" class="cls-1" d="M622,681H0V-1H622V681h0Z"/>
<g id="g12">
<path id="path14" class="cls-2" d="M316.89,497.72h-19l0.06,141.74H375V621.93h-58l-0.06-124.22h0Z"/>
</g>
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</g>
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</g>
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<path id="path34" class="cls-2" d="M109.84,513.08c16.88,0,27.7,5.63,34.85,11.25l8.19-14.18c-11.16-9.78-26.16-15-42.17-15-40.47,0-68.83,24.67-68.83,74.44,0,52.15,30.59,72.5,65.58,72.5a111,111,0,0,0,42.21-8.22l-0.4-55.72V560.58H97.32v17.53h33.12l0.4,42.31c-4.33,2.16-11.9,3.9-22.08,3.9-28.14,0-47-17.7-47-55,0-37.87,19.48-56.26,48.05-56.26"/>
</g>
<g id="g36">
<path id="path38" class="cls-2" d="M243.79,497.72H225.17l0.06,23.8v82.23c0,22.94,10,38.3,38.31,38.3A64.16,64.16,0,0,0,275,641V624.31a57,57,0,0,1-8.66.65c-15.58,0-22.51-8-22.51-21.42v-56.7H275V531.26H243.85l-0.06-33.54h0Z"/>
</g>
<path id="path40" class="cls-2" d="M177.94,639.46h18.61V531.26H177.94v108.2h0Z"/>
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</g>
<g id="g48">
<path id="path50" class="cls-4" d="M311,435.71h0l79.12-243.47H231.88L311,435.71h0Z"/>
</g>
<g id="g56">
<path id="path58" class="cls-3" d="M311,435.71L231.88,192.24H121L311,435.71h0Z"/>
</g>
<g id="g64">
<path id="path66" class="cls-5" d="M121,192.24h0l-24,74a16.37,16.37,0,0,0,6,18.31L311,435.7,121,192.24h0Z"/>
</g>
<g id="g72">
<path id="path74" class="cls-4" d="M121,192.24H231.88L184.22,45.6a8.19,8.19,0,0,0-15.58,0L121,192.24h0Z"/>
</g>
<g id="g76">
<path id="path78" class="cls-3" d="M311,435.71l79.12-243.47H501L311,435.71h0Z"/>
</g>
<g id="g80">
<path id="path82" class="cls-5" d="M501,192.24h0l24,74a16.37,16.37,0,0,1-6,18.31L311,435.7,501,192.24h0Z"/>
</g>
<g id="g84">
<path id="path86" class="cls-4" d="M501,192.24H390.12L437.78,45.6a8.19,8.19,0,0,1,15.58,0L501,192.24h0Z"/>
</g>
</svg>
<?xml version="1.0"?>
<svg xmlns="http://www.w3.org/2000/svg" id="Layer_1" data-name="Layer 1" viewBox="0 0 622 682" filterMe="test">
<iframe src="http://www.google.com"></iframe>
<defs>
<style>.cls-1{fill:#30353e;}.cls-2{fill:#8c929d;}.cls-3{fill:#fc6d26;}.cls-4{fill:#e24329;}.cls-5{fill:#fca326;}</style>
</defs>
<title>stacked_wm</title>
<path id="bg" class="cls-1" d="M622,681H0V-1H622V681h0Z"/>
<g id="g12">
<path id="path14" class="cls-2" d="M316.89,497.72h-19l0.06,141.74H375V621.93h-58l-0.06-124.22h0Z"/>
</g>
<g id="g24">
<path id="path26" class="cls-2" d="M448.32,614.57a32.46,32.46,0,0,1-23.59,10c-14.5,0-20.35-7.14-20.35-16.45,0-14.07,9.74-20.77,30.52-20.77a86.46,86.46,0,0,1,13.42,1.08v26.19h0Zm-19.7-85.91a63.45,63.45,0,0,0-40.5,14.53l6.73,11.66c7.79-4.54,17.32-9.09,31-9.09,15.58,0,22.51,8,22.51,21.42v6.93a81.48,81.48,0,0,0-13.2-1.08c-33.33,0-50.22,11.69-50.22,36.14,0,21.86,13.42,32.89,33.76,32.89,13.71,0,26.84-6.28,31.38-16.45l3.46,13.85h13.42V567c0-22.94-10-38.3-38.31-38.3h0Z"/>
</g>
<g id="g28">
<path id="path30" class="cls-2" d="M528.4,625.18c-7.14,0-13.42-.87-18.18-3V556.58c6.49-5.41,14.5-9.31,24.68-9.31,18.4,0,25.54,13,25.54,34,0,29.86-11.47,43.93-32,43.93m8-96.52a34.88,34.88,0,0,0-26.19,11.58V522l-0.06-24.24H491.54L491.6,636c9.31,3.9,22.08,6.06,35.93,6.06,35.5,0,52.6-22.72,52.6-61.89,0-30.95-15.8-51.51-43.73-51.51"/>
</g>
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</g>
<g id="g36">
<path id="path38" class="cls-2" d="M243.79,497.72H225.17l0.06,23.8v82.23c0,22.94,10,38.3,38.31,38.3A64.16,64.16,0,0,0,275,641V624.31a57,57,0,0,1-8.66.65c-15.58,0-22.51-8-22.51-21.42v-56.7H275V531.26H243.85l-0.06-33.54h0Z"/>
</g>
<path id="path40" class="cls-2" d="M177.94,639.46h18.61V531.26H177.94v108.2h0Z"/>
<path id="path42" class="cls-2" d="M177.94,516.33h18.61V497.72H177.94v18.61h0Z"/>
<g id="g44">
<path id="path46" class="cls-3" d="M525.05,266.23l-24-74L453.36,45.6a8.19,8.19,0,0,0-15.58,0L390.12,192.24H231.88L184.22,45.6a8.19,8.19,0,0,0-15.58,0L121,192.24l-24,74a16.38,16.38,0,0,0,6,18.31L311,435.71,519.1,284.54a16.38,16.38,0,0,0,6-18.31"/>
</g>
<g id="g48">
<path id="path50" class="cls-4" d="M311,435.71h0l79.12-243.47H231.88L311,435.71h0Z"/>
</g>
<g id="g56">
<path id="path58" class="cls-3" d="M311,435.71L231.88,192.24H121L311,435.71h0Z"/>
</g>
<g id="g64">
<path id="path66" class="cls-5" d="M121,192.24h0l-24,74a16.37,16.37,0,0,0,6,18.31L311,435.7,121,192.24h0Z"/>
</g>
<g id="g72">
<path id="path74" class="cls-4" d="M121,192.24H231.88L184.22,45.6a8.19,8.19,0,0,0-15.58,0L121,192.24h0Z"/>
</g>
<g id="g76">
<path id="path78" class="cls-3" d="M311,435.71l79.12-243.47H501L311,435.71h0Z"/>
</g>
<g id="g80">
<path id="path82" class="cls-5" d="M501,192.24h0l24,74a16.37,16.37,0,0,1-6,18.31L311,435.7,501,192.24h0Z"/>
</g>
<g id="g84">
<path id="path86" class="cls-4" d="M501,192.24H390.12L437.78,45.6a8.19,8.19,0,0,1,15.58,0L501,192.24h0Z"/>
</g>
</svg>
......@@ -67,4 +67,16 @@ def test(input):
expect(result).to eq(expected)
end
end
describe "#sanitize_svg" do
let(:input_svg_path) { File.join(Rails.root, 'spec', 'fixtures', 'unsanitized.svg') }
let(:data) { open(input_svg_path).read }
let(:expected_svg_path) { File.join(Rails.root, 'spec', 'fixtures', 'sanitized.svg') }
let(:expected) { open(expected_svg_path).read }
it 'should retain essential elements' do
blob = OpenStruct.new(data: data)
expect(sanitize_svg(blob).data).to eq(expected)
end
end
end
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