Commit 4a844b73 authored by Robert Speicher's avatar Robert Speicher

Merge branch 'fix-sanitize-svg' into 'master'

Update SVG sanitizer to conform to SVG 1.1

Original SVG sanitizer would strip out necessary elements and attributes.

Use a custom Loofah scrubber since sanitize 2.x transformers are inadequate to handle case-sensitive SVG attributes since they parse 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

See merge request !3401
parents f3578baa 21d89d02
...@@ -16,6 +16,7 @@ v 8.8.0 (unreleased) ...@@ -16,6 +16,7 @@ v 8.8.0 (unreleased)
- Use ActionDispatch Remote IP for Akismet checking - Use ActionDispatch Remote IP for Akismet checking
- Fix error when visiting commit builds page before build was updated - 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 - 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 - Updated search UI
- Display informative message when new milestone is created - Display informative message when new milestone is created
- Allow "NEWS" and "CHANGES" as alternative names for CHANGELOG. !3768 (Connor Shea) - Allow "NEWS" and "CHANGES" as alternative names for CHANGELOG. !3768 (Connor Shea)
......
...@@ -131,7 +131,7 @@ module BlobHelper ...@@ -131,7 +131,7 @@ module BlobHelper
# elements and attributes. Note that this whitelist is by no means complete # elements and attributes. Note that this whitelist is by no means complete
# and may omit some elements. # and may omit some elements.
def sanitize_svg(blob) def sanitize_svg(blob)
blob.data = Loofah.scrub_fragment(blob.data, :strip).to_xml blob.data = Gitlab::Sanitizers::SVG.clean(blob.data)
blob blob
end 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">
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</g>
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</g>
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</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"/>
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</svg>
...@@ -67,4 +67,16 @@ describe BlobHelper do ...@@ -67,4 +67,16 @@ describe BlobHelper do
expect(result).to eq(expected) expect(result).to eq(expected)
end end
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 end
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