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fixed #191: scrub_css drops !important rule from shorthand css properties #192

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merged 3 commits into from Aug 26, 2020
Merged

fixed #191: scrub_css drops !important rule from shorthand css properties #192

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50931f4
scrub_css should not drop `!important` from shorthand css props
christiankisssner Aug 25, 2020
ea6fe90
prefer Array#<< to creating a new array
flavorjones Aug 26, 2020
0aba0b9
update CHANGELOG
flavorjones Aug 26, 2020
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7 changes: 7 additions & 0 deletions CHANGELOG.md
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@@ -1,5 +1,12 @@
# Changelog

## unreleased

### Fixes

* Don't drop the `!important` rule from some CSS properties. [[#191](https://github.com/flavorjones/loofah/issues/191)] (Thanks, [@b7kich](https://github.com/b7kich)!)


## 2.6.0 / 2020-06-16

### Features
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2 changes: 2 additions & 0 deletions lib/loofah/html5/scrub.rb
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Expand Up @@ -8,6 +8,7 @@ module Scrub
CONTROL_CHARACTERS = /[`\u0000-\u0020\u007f\u0080-\u0101]/
CSS_KEYWORDISH = /\A(#[0-9a-fA-F]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|-?\d{0,3}\.?\d{0,10}(ch|cm|r?em|ex|in|lh|mm|pc|pt|px|Q|vmax|vmin|vw|vh|%|,|\))?)\z/
CRASS_SEMICOLON = { :node => :semicolon, :raw => ";" }
CSS_IMPORTANT = '!important'

class << self
def allowed_element?(element_name)
Expand Down Expand Up @@ -90,6 +91,7 @@ def scrub_css(style)
end
end.compact
unless value.empty?
value << CSS_IMPORTANT if node[:important]
propstring = sprintf "%s:%s", name, value.join(" ")
sanitized_node = Crass.parse_properties(propstring).first
sanitized_tree << sanitized_node << CRASS_SEMICOLON
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8 changes: 8 additions & 0 deletions test/assets/testdata_sanitizer_tests1.dat
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Expand Up @@ -486,6 +486,14 @@
"rexml": "<div style='color: blue;'></div>"
},

{
"name": "style_attr_shorthand_important",
"input": "<div style=\"border: 2px dashed gray !important;\" />",
"output": "<div style='border:2px dashed gray !important;'/>",
"xhtml": "<div style='border:2px dashed gray !important;'></div>",
"rexml": "<div style='border:2px dashed gray !important;'></div>"
},

{
"name": "attributes_with_embedded_quotes",
"input": "<img src=doesntexist.jpg\"'onerror=\"alert(1) />",
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