| Class | HTML::WhiteListSanitizer |
| In: |
vendor/rails/actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb
|
| Parent: | Sanitizer |
Sanitizes a block of css code. Used by sanitize when it comes across a style attribute
# File vendor/rails/actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb, line 104
104: def sanitize_css(style)
105: # disallow urls
106: style = style.to_s.gsub(/url\s*\(\s*[^\s)]+?\s*\)\s*/, ' ')
107:
108: # gauntlet
109: if style !~ /^([:,;#%.\sa-zA-Z0-9!]|\w-\w|\'[\s\w]+\'|\"[\s\w]+\"|\([\d,\s]+\))*$/ ||
110: style !~ /^(\s*[-\w]+\s*:\s*[^:;]*(;|$))*$/
111: return ''
112: end
113:
114: clean = []
115: style.scan(/([-\w]+)\s*:\s*([^:;]*)/) do |prop,val|
116: if allowed_css_properties.include?(prop.downcase)
117: clean << prop + ': ' + val + ';'
118: elsif shorthand_css_properties.include?(prop.split('-')[0].downcase)
119: unless val.split().any? do |keyword|
120: !allowed_css_keywords.include?(keyword) &&
121: keyword !~ /^(#[0-9a-f]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|\d{0,2}\.?\d{0,2}(cm|em|ex|in|mm|pc|pt|px|%|,|\))?)$/
122: end
123: clean << prop + ': ' + val + ';'
124: end
125: end
126: end
127: clean.join(' ')
128: end
# File vendor/rails/actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb, line 168
168: def contains_bad_protocols?(attr_name, value)
169: uri_attributes.include?(attr_name) &&
170: (value =~ /(^[^\/:]*):|(�*58)|(p)|(%|%)3A/ && !allowed_protocols.include?(value.split(protocol_separator).first))
171: end
# File vendor/rails/actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb, line 155
155: def process_attributes_for(node, options)
156: return unless node.attributes
157: node.attributes.keys.each do |attr_name|
158: value = node.attributes[attr_name].to_s
159:
160: if !options[:attributes].include?(attr_name) || contains_bad_protocols?(attr_name, value)
161: node.attributes.delete(attr_name)
162: else
163: node.attributes[attr_name] = attr_name == 'style' ? sanitize_css(value) : CGI::escapeHTML(value)
164: end
165: end
166: end
# File vendor/rails/actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb, line 138
138: def process_node(node, result, options)
139: result << case node
140: when HTML::Tag
141: if node.closing == :close
142: options[:parent].shift
143: else
144: options[:parent].unshift node.name
145: end
146:
147: process_attributes_for node, options
148:
149: options[:tags].include?(node.name) ? node : nil
150: else
151: bad_tags.include?(options[:parent].first) ? nil : node.to_s.gsub(/</, "<")
152: end
153: end