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test_sanitizer.rb
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test_sanitizer.rb
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#
# these tests taken from the HTML5 sanitization project and modified for use with Loofah
# see the original here: http://code.google.com/p/html5lib/source/browse/ruby/test/test_sanitizer.rb
#
# license text at the bottom of this file
#
require "helper"
class Html5TestSanitizer < Loofah::TestCase
include Loofah
def sanitize_xhtml stream
Loofah.fragment(stream).scrub!(:escape).to_xhtml
end
def sanitize_html stream
Loofah.fragment(stream).scrub!(:escape).to_html
end
def check_sanitization(input, htmloutput, xhtmloutput, rexmloutput)
## libxml uses double-quotes, so let's swappo-boppo our quotes before comparing.
sane = sanitize_html(input).gsub('"',"'")
htmloutput = htmloutput.gsub('"',"'")
xhtmloutput = xhtmloutput.gsub('"',"'")
rexmloutput = rexmloutput.gsub('"',"'")
## HTML5's parsers are shit. there's so much inconsistency with what has closing tags, etc, that
## it would require a lot of manual hacking to make the tests match libxml's output.
## instead, I'm taking the shotgun approach, and trying to match any of the described outputs.
assert((htmloutput == sane) || (rexmloutput == sane) || (xhtmloutput == sane),
%Q{given: "#{input}"\nexpected: "#{htmloutput}"\ngot: "#{sane}"})
end
def assert_completes_in_reasonable_time &block
t0 = Time.now
block.call
assert_in_delta t0, Time.now, 0.1 # arbitrary seconds
end
(HTML5::WhiteList::ALLOWED_ELEMENTS).each do |tag_name|
define_method "test_should_allow_#{tag_name}_tag" do
input = "<#{tag_name} title='1'>foo <bad>bar</bad> baz</#{tag_name}>"
htmloutput = "<#{tag_name.downcase} title='1'>foo <bad>bar</bad> baz</#{tag_name.downcase}>"
xhtmloutput = "<#{tag_name} title='1'>foo <bad>bar</bad> baz</#{tag_name}>"
rexmloutput = xhtmloutput
if %w[caption colgroup optgroup option tbody td tfoot th thead tr].include?(tag_name)
htmloutput = "foo <bad>bar</bad> baz"
xhtmloutput = htmloutput
elsif tag_name == 'col'
htmloutput = "<col title='1'>foo <bad>bar</bad> baz"
xhtmloutput = htmloutput
rexmloutput = "<col title='1' />"
elsif tag_name == 'table'
htmloutput = "foo <bad>bar</bad>baz<table title='1'> </table>"
xhtmloutput = htmloutput
elsif tag_name == 'image'
htmloutput = "<img title='1'/>foo <bad>bar</bad> baz"
xhtmloutput = htmloutput
rexmloutput = "<image title='1'>foo <bad>bar</bad> baz</image>"
elsif HTML5::WhiteList::VOID_ELEMENTS.include?(tag_name)
htmloutput = "<#{tag_name} title='1'>foo <bad>bar</bad> baz"
xhtmloutput = htmloutput
htmloutput += '<br/>' if tag_name == 'br'
rexmloutput = "<#{tag_name} title='1' />"
end
check_sanitization(input, htmloutput, xhtmloutput, rexmloutput)
end
end
##
## libxml2 downcases elements, so this is moot.
##
# HTML5::WhiteList::ALLOWED_ELEMENTS.each do |tag_name|
# define_method "test_should_forbid_#{tag_name.upcase}_tag" do
# input = "<#{tag_name.upcase} title='1'>foo <bad>bar</bad> baz</#{tag_name.upcase}>"
# output = "<#{tag_name.upcase} title=\"1\">foo <bad>bar</bad> baz</#{tag_name.upcase}>"
# check_sanitization(input, output, output, output)
# end
# end
HTML5::WhiteList::ALLOWED_ATTRIBUTES.each do |attribute_name|
next if attribute_name == 'style'
define_method "test_should_allow_#{attribute_name}_attribute" do
input = "<p #{attribute_name}='foo'>foo <bad>bar</bad> baz</p>"
if %w[checked compact disabled ismap multiple nohref noshade nowrap readonly selected].include?(attribute_name)
output = "<p #{attribute_name}>foo <bad>bar</bad> baz</p>"
htmloutput = "<p #{attribute_name.downcase}>foo <bad>bar</bad> baz</p>"
else
output = "<p #{attribute_name}='foo'>foo <bad>bar</bad> baz</p>"
htmloutput = "<p #{attribute_name.downcase}='foo'>foo <bad>bar</bad> baz</p>"
end
check_sanitization(input, htmloutput, output, output)
end
end
def test_should_allow_data_attributes
input = "<p data-foo='foo'>foo <bad>bar</bad> baz</p>"
output = "<p data-foo='foo'>foo <bad>bar</bad> baz</p>"
htmloutput = "<p data-foo='foo'>foo <bad>bar</bad> baz</p>"
check_sanitization(input, htmloutput, output, output)
end
def test_should_allow_multi_word_data_attributes
input = "<p data-foo-bar-id='11'>foo <bad>bar</bad> baz</p>"
output = htmloutput = "<p data-foo-bar-id='11'>foo <bad>bar</bad> baz</p>"
check_sanitization(input, htmloutput, output, output)
end
##
## libxml2 downcases attributes, so this is moot.
##
# HTML5::WhiteList::ALLOWED_ATTRIBUTES.each do |attribute_name|
# define_method "test_should_forbid_#{attribute_name.upcase}_attribute" do
# input = "<p #{attribute_name.upcase}='display: none;'>foo <bad>bar</bad> baz</p>"
# output = "<p>foo <bad>bar</bad> baz</p>"
# check_sanitization(input, output, output, output)
# end
# end
HTML5::WhiteList::ALLOWED_PROTOCOLS.each do |protocol|
define_method "test_should_allow_#{protocol}_uris" do
input = %(<a href="#{protocol}">foo</a>)
output = "<a href='#{protocol}'>foo</a>"
check_sanitization(input, output, output, output)
end
end
HTML5::WhiteList::ALLOWED_PROTOCOLS.each do |protocol|
define_method "test_should_allow_uppercase_#{protocol}_uris" do
input = %(<a href="#{protocol.upcase}">foo</a>)
output = "<a href='#{protocol.upcase}'>foo</a>"
check_sanitization(input, output, output, output)
end
end
HTML5::WhiteList::ALLOWED_URI_DATA_MEDIATYPES.each do |data_uri_type|
define_method "test_should_allow_data_#{data_uri_type}_uris" do
input = %(<a href="data:#{data_uri_type}">foo</a>)
output = "<a href='data:#{data_uri_type}'>foo</a>"
check_sanitization(input, output, output, output)
input = %(<a href="data:#{data_uri_type};base64,R0lGODlhAQABA">foo</a>)
output = "<a href='data:#{data_uri_type};base64,R0lGODlhAQABA'>foo</a>"
check_sanitization(input, output, output, output)
end
end
HTML5::WhiteList::ALLOWED_URI_DATA_MEDIATYPES.each do |data_uri_type|
define_method "test_should_allow_uppercase_data_#{data_uri_type}_uris" do
input = %(<a href="DATA:#{data_uri_type.upcase}">foo</a>)
output = "<a href='DATA:#{data_uri_type.upcase}'>foo</a>"
check_sanitization(input, output, output, output)
end
end
def test_should_disallow_other_uri_mediatypes
input = %(<a href="data:foo">foo</a>)
output = "<a>foo</a>"
check_sanitization(input, output, output, output)
input = %(<a href="data:image/xxx">foo</a>)
output = "<a>foo</a>"
check_sanitization(input, output, output, output)
input = %(<a href="data:image/xxx;base64,R0lGODlhAQABA">foo</a>)
output = "<a>foo</a>"
check_sanitization(input, output, output, output)
end
HTML5::WhiteList::SVG_ALLOW_LOCAL_HREF.each do |tag_name|
next unless HTML5::WhiteList::ALLOWED_ELEMENTS.include?(tag_name)
define_method "test_#{tag_name}_should_allow_local_href" do
input = %(<#{tag_name} xlink:href="#foo"/>)
output = "<#{tag_name.downcase} xlink:href='#foo'></#{tag_name.downcase}>"
xhtmloutput = "<#{tag_name} xlink:href='#foo'></#{tag_name}>"
check_sanitization(input, output, xhtmloutput, xhtmloutput)
end
define_method "test_#{tag_name}_should_allow_local_href_with_newline" do
input = %(<#{tag_name} xlink:href="\n#foo"/>)
output = "<#{tag_name.downcase} xlink:href='\n#foo'></#{tag_name.downcase}>"
xhtmloutput = "<#{tag_name} xlink:href='\n#foo'></#{tag_name}>"
check_sanitization(input, output, xhtmloutput, xhtmloutput)
end
define_method "test_#{tag_name}_should_forbid_nonlocal_href" do
input = %(<#{tag_name} xlink:href="http://bad.com/foo"/>)
output = "<#{tag_name.downcase}></#{tag_name.downcase}>"
xhtmloutput = "<#{tag_name}></#{tag_name}>"
check_sanitization(input, output, xhtmloutput, xhtmloutput)
end
define_method "test_#{tag_name}_should_forbid_nonlocal_href_with_newline" do
input = %(<#{tag_name} xlink:href="\nhttp://bad.com/foo"/>)
output = "<#{tag_name.downcase}></#{tag_name.downcase}>"
xhtmloutput = "<#{tag_name}></#{tag_name}>"
check_sanitization(input, output, xhtmloutput, xhtmloutput)
end
end
def test_figure_element_is_valid
fragment = Loofah.scrub_fragment("<span>hello</span> <figure>asd</figure>", :prune)
assert fragment.at_css("figure"), "<figure> tag was scrubbed"
end
##
## as tenderlove says, "care < 0"
##
# def test_should_handle_astral_plane_characters
# input = "<p>𝒵 𝔸</p>"
# output = "<p>\360\235\222\265 \360\235\224\270</p>"
# check_sanitization(input, output, output, output)
# input = "<p><tspan>\360\235\224\270</tspan> a</p>"
# output = "<p><tspan>\360\235\224\270</tspan> a</p>"
# check_sanitization(input, output, output, output)
# end
# This affects only NS4. Is it worth fixing?
# def test_javascript_includes
# input = %(<div size="&{alert('XSS')}">foo</div>)
# output = "<div>foo</div>"
# check_sanitization(input, output, output, output)
# end
##
## these tests primarily test the parser logic, not the sanitizer
## logic. i call bullshit. we're not writing a test suite for
## libxml2 here, so let's rely on the unit tests above to take care
## of our valid elements and attributes.
##
require 'json'
Dir[File.join(File.dirname(__FILE__), '..', 'assets', 'testdata_sanitizer_tests1.dat')].each do |filename|
JSON::parse(open(filename).read).each do |test|
it "testdata sanitizer #{test['name']}" do
check_sanitization(
test['input'],
test['output'],
test['xhtml'] || test['output'],
test['rexml'] || test['output']
)
end
end
end
## added because we don't have any coverage above on SVG_ATTR_VAL_ALLOWS_REF
HTML5::WhiteList::SVG_ATTR_VAL_ALLOWS_REF.each do |attr_name|
define_method "test_should_allow_uri_refs_in_svg_attribute_#{attr_name}" do
input = "<rect fill='url(#foo)' />"
output = "<rect fill='url(#foo)'></rect>"
check_sanitization(input, output, output, output)
end
define_method "test_absolute_uri_refs_in_svg_attribute_#{attr_name}" do
input = "<rect fill='url(http://bad.com/) #fff' />"
output = "<rect fill=' #fff'></rect>"
check_sanitization(input, output, output, output)
end
end
def test_css_negative_value_sanitization
html = "<span style=\"letter-spacing:-0.03em;\">"
sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :escape).to_xml)
assert_match %r/-0.03em/, sane.inner_html
end
def test_css_negative_value_sanitization_shorthand_css_properties
html = "<span style=\"margin-left:-0.05em;\">"
sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :escape).to_xml)
assert_match %r/-0.05em/, sane.inner_html
end
def test_css_function_sanitization_leaves_whitelisted_functions_calc
html = "<span style=\"width:calc(5%)\">"
sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :strip).to_html)
assert_match %r/calc\(5%\)/, sane.inner_html
html = "<span style=\"width: calc(5%)\">"
sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :strip).to_html)
assert_match %r/calc\(5%\)/, sane.inner_html
end
def test_css_function_sanitization_leaves_whitelisted_functions_rgb
html = '<span style="color: rgb(255, 0, 0)">'
sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :strip).to_html)
assert_match %r/rgb\(255, 0, 0\)/, sane.inner_html
end
def test_css_function_sanitization_leaves_whitelisted_list_style_type
html = "<ol style='list-style-type:lower-greek;'></ol>"
sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :strip).to_html)
assert_match %r/list-style-type:lower-greek/, sane.inner_html
end
def test_css_function_sanitization_strips_style_attributes_with_unsafe_functions
html = "<span style=\"width:url(data-evil-url)\">"
sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :strip).to_html)
assert_match %r/<span><\/span>/, sane.inner_html
html = "<span style=\"width: url(data-evil-url)\">"
sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :strip).to_html)
assert_match %r/<span><\/span>/, sane.inner_html
end
def test_issue_90_slow_regex
skip("timing tests are hard to make pass and have little regression-testing value")
html = %q{<span style="background: url('data:image/svg+xml;charset=utf-8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2232%22%20height%3D%2232%22%20viewBox%3D%220%200%2032%2032%22%3E%3Cpath%20fill%3D%22%23D4C8AE%22%20d%3D%22M0%200h32v32h-32z%22%2F%3E%3Cpath%20fill%3D%22%2383604B%22%20d%3D%22M0%200h31.99v11.75h-31.99z%22%2F%3E%3Cpath%20fill%3D%22%233D2319%22%20d%3D%22M0%2011.5h32v.5h-32z%22%2F%3E%3Cpath%20fill%3D%22%23F83651%22%20d%3D%22M5%200h1v10.5h-1z%22%2F%3E%3Cpath%20fill%3D%22%23FCD050%22%20d%3D%22M6%200h1v10.5h-1z%22%2F%3E%3Cpath%20fill%3D%22%2371C797%22%20d%3D%22M7%200h1v10.5h-1z%22%2F%3E%3Cpath%20fill%3D%22%23509CF9%22%20d%3D%22M8%200h1v10.5h-1z%22%2F%3E%3ClinearGradient%20id%3D%22a%22%20gradientUnits%3D%22userSpaceOnUse%22%20x1%3D%2224.996%22%20y1%3D%2210.5%22%20x2%3D%2224.996%22%20y2%3D%224.5%22%3E%3Cstop%20offset%3D%220%22%20stop-color%3D%22%23796055%22%2F%3E%3Cstop%20offset%3D%22.434%22%20stop-color%3D%22%23614C43%22%2F%3E%3Cstop%20offset%3D%221%22%20stop-color%3D%22%233D2D28%22%2F%3E%3C%2FlinearGradient%3E%3Cpath%20fill%3D%22url(%23a)%22%20d%3D%22M28%208.5c0%201.1-.9%202-2%202h-2c-1.1%200-2-.9-2-2v-2c0-1.1.9-2%202-2h2c1.1%200%202%20.9%202%202v2z%22%2F%3E%3Cpath%20fill%3D%22%235F402E%22%20d%3D%22M28%208c0%201.1-.9%202-2%202h-2c-1.1%200-2-.9-2-2v-2c0-1.1.9-2%202-2h2c1.1%200%202%20.9%202%202v2z%22%2F%3E%3C');"></span>}
assert_completes_in_reasonable_time {
Nokogiri::HTML(Loofah.scrub_fragment(html, :strip).to_html)
}
end
def test_upper_case_css_property
html = "<div style=\"COLOR: BLUE; NOTAPROPERTY: RED;\">asdf</div>"
sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :strip).to_xml)
assert_match(/COLOR:\s*BLUE/i, sane.at_css("div")["style"])
refute_match(/NOTAPROPERTY/i, sane.at_css("div")["style"])
end
def test_many_properties_some_allowed
html = "<div style=\"background: bold notaproperty center alsonotaproperty 10px;\">asdf</div>"
sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :strip).to_xml)
assert_match(/bold\s+center\s+10px/, sane.at_css("div")["style"])
end
def test_many_properties_non_allowed
html = "<div style=\"background: notaproperty alsonotaproperty;\">asdf</div>"
sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :strip).to_xml)
assert_nil sane.at_css("div")["style"]
end
def test_svg_properties
html = "<line style='stroke-width: 10px;'></line>"
sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :strip).to_xml)
assert_match(/stroke-width:\s*10px/, sane.at_css("line")["style"])
end
end
# <html5_license>
#
# Copyright (c) 2006-2008 The Authors
#
# Contributors:
# James Graham - jg307@cam.ac.uk
# Anne van Kesteren - annevankesteren@gmail.com
# Lachlan Hunt - lachlan.hunt@lachy.id.au
# Matt McDonald - kanashii@kanashii.ca
# Sam Ruby - rubys@intertwingly.net
# Ian Hickson (Google) - ian@hixie.ch
# Thomas Broyer - t.broyer@ltgt.net
# Jacques Distler - distler@golem.ph.utexas.edu
# Henri Sivonen - hsivonen@iki.fi
# The Mozilla Foundation (contributions from Henri Sivonen since 2008)
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
# </html5_license>