diff options
| -rw-r--r-- | lib/banzai/filter/sanitization_filter.rb | 8 | ||||
| -rw-r--r-- | spec/lib/banzai/filter/sanitization_filter_spec.rb | 9 |
2 files changed, 12 insertions, 5 deletions
diff --git a/lib/banzai/filter/sanitization_filter.rb b/lib/banzai/filter/sanitization_filter.rb index 04ddfe53ed6..c201ace8d35 100644 --- a/lib/banzai/filter/sanitization_filter.rb +++ b/lib/banzai/filter/sanitization_filter.rb @@ -43,8 +43,8 @@ module Banzai # Allow any protocol in `a` elements... whitelist[:protocols].delete('a') - # ...but then remove links with the `javascript` protocol - whitelist[:transformers].push(remove_javascript_links) + # ...but then remove links with unsafe protocols + whitelist[:transformers].push(remove_unsafe_links) # Remove `rel` attribute from `a` elements whitelist[:transformers].push(remove_rel) @@ -55,14 +55,14 @@ module Banzai whitelist end - def remove_javascript_links + def remove_unsafe_links lambda do |env| node = env[:node] return unless node.name == 'a' return unless node.has_attribute?('href') - if node['href'].start_with?('javascript', ':javascript') + if node['href'].start_with?('javascript', ':javascript', 'data') node.remove_attribute('href') end end diff --git a/spec/lib/banzai/filter/sanitization_filter_spec.rb b/spec/lib/banzai/filter/sanitization_filter_spec.rb index e14a6dbf922..247f492e6a9 100644 --- a/spec/lib/banzai/filter/sanitization_filter_spec.rb +++ b/spec/lib/banzai/filter/sanitization_filter_spec.rb @@ -156,13 +156,20 @@ describe Banzai::Filter::SanitizationFilter, lib: true do } protocols.each do |name, data| - it "handles #{name}" do + it "disallows #{name}" do doc = filter(data[:input]) expect(doc.to_html).to eq data[:output] end end + it 'disallows data links' do + input = '<a href="data:text/html;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4K">XSS</a>' + output = filter(input) + + expect(output.to_html).to eq '<a>XSS</a>' + end + it 'allows non-standard anchor schemes' do exp = %q{<a href="irc://irc.freenode.net/git">IRC</a>} act = filter(exp) |