Sanitization now preserves case-sensitive element and attribute names (necessary to support SVG).
Unit tests, galore.
This commit is contained in:
Jacques Distler
parent
2fa1e08c96
commit
e179508377
530
lib/node.rb
Normal file
530
lib/node.rb
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@ -0,0 +1,530 @@
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require 'strscan'
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module XHTML #:nodoc:
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class Conditions < Hash #:nodoc:
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def initialize(hash)
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super()
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hash = { :content => hash } unless Hash === hash
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hash = keys_to_symbols(hash)
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hash.each do |k,v|
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case k
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when :tag, :content then
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# keys are valid, and require no further processing
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when :attributes then
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hash[k] = keys_to_strings(v)
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when :parent, :child, :ancestor, :descendant, :sibling, :before,
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:after
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hash[k] = Conditions.new(v)
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when :children
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hash[k] = v = keys_to_symbols(v)
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v.each do |k,v2|
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case k
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when :count, :greater_than, :less_than
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# keys are valid, and require no further processing
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when :only
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v[k] = Conditions.new(v2)
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else
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raise "illegal key #{k.inspect} => #{v2.inspect}"
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end
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end
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else
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raise "illegal key #{k.inspect} => #{v.inspect}"
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end
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end
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update hash
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end
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private
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def keys_to_strings(hash)
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hash.keys.inject({}) do |h,k|
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h[k.to_s] = hash[k]
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h
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end
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end
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def keys_to_symbols(hash)
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hash.keys.inject({}) do |h,k|
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raise "illegal key #{k.inspect}" unless k.respond_to?(:to_sym)
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h[k.to_sym] = hash[k]
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h
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end
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end
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end
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# The base class of all nodes, textual and otherwise, in an HTML document.
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class Node #:nodoc:
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# The array of children of this node. Not all nodes have children.
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attr_reader :children
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# The parent node of this node. All nodes have a parent, except for the
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# root node.
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attr_reader :parent
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# The line number of the input where this node was begun
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attr_reader :line
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# The byte position in the input where this node was begun
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attr_reader :position
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# Create a new node as a child of the given parent.
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def initialize(parent, line=0, pos=0)
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@parent = parent
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@children = []
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@line, @position = line, pos
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end
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# Return a textual representation of the node.
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def to_s
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s = ""
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@children.each { |child| s << child.to_s }
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s
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end
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# Return false (subclasses must override this to provide specific matching
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# behavior.) +conditions+ may be of any type.
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def match(conditions)
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false
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end
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# Search the children of this node for the first node for which #find
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# returns non +nil+. Returns the result of the #find call that succeeded.
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def find(conditions)
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conditions = validate_conditions(conditions)
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@children.each do |child|
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node = child.find(conditions)
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return node if node
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end
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nil
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end
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# Search for all nodes that match the given conditions, and return them
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# as an array.
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def find_all(conditions)
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conditions = validate_conditions(conditions)
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matches = []
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matches << self if match(conditions)
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@children.each do |child|
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matches.concat child.find_all(conditions)
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end
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matches
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end
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# Returns +false+. Subclasses may override this if they define a kind of
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# tag.
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def tag?
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false
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end
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def validate_conditions(conditions)
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Conditions === conditions ? conditions : Conditions.new(conditions)
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end
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def ==(node)
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return false unless self.class == node.class && children.size == node.children.size
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equivalent = true
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children.size.times do |i|
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equivalent &&= children[i] == node.children[i]
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end
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equivalent
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end
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class <<self
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def parse(parent, line, pos, content, strict=true)
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if content !~ /^<\S/
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Text.new(parent, line, pos, content)
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else
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scanner = StringScanner.new(content)
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unless scanner.skip(/</)
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if strict
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raise "expected <"
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else
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return Text.new(parent, line, pos, content)
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end
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end
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if scanner.skip(/!\[CDATA\[/)
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scanner.scan_until(/\]\]>/)
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return CDATA.new(parent, line, pos, scanner.pre_match.gsub(/<!\[CDATA\[/, ''))
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end
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closing = ( scanner.scan(/\//) ? :close : nil )
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return Text.new(parent, line, pos, content) unless name = scanner.scan(/[\w:-]+/)
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name
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unless closing
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scanner.skip(/\s*/)
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attributes = {}
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while attr = scanner.scan(/[-\w:]+/)
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value = true
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if scanner.scan(/\s*=\s*/)
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if delim = scanner.scan(/['"]/)
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value = ""
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while text = scanner.scan(/[^#{delim}\\]+|./)
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case text
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when "\\" then
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value << text
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value << scanner.getch
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when delim
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break
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else value << text
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end
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end
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else
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value = scanner.scan(/[^\s>\/]+/)
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end
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end
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attributes[attr] = value
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scanner.skip(/\s*/)
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end
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closing = ( scanner.scan(/\//) ? :self : nil )
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end
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unless scanner.scan(/\s*>/)
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if strict
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raise "expected > (got #{scanner.rest.inspect} for #{content}, #{attributes.inspect})"
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else
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# throw away all text until we find what we're looking for
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scanner.skip_until(/>/) or scanner.terminate
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end
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end
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Tag.new(parent, line, pos, name, attributes, closing)
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end
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end
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end
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end
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# A node that represents text, rather than markup.
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class Text < Node #:nodoc:
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attr_reader :content
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# Creates a new text node as a child of the given parent, with the given
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# content.
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def initialize(parent, line, pos, content)
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super(parent, line, pos)
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@content = content
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end
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# Returns the content of this node.
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def to_s
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@content
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end
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# Returns +self+ if this node meets the given conditions. Text nodes support
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# conditions of the following kinds:
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#
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# * if +conditions+ is a string, it must be a substring of the node's
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# content
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# * if +conditions+ is a regular expression, it must match the node's
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# content
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# * if +conditions+ is a hash, it must contain a <tt>:content</tt> key that
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# is either a string or a regexp, and which is interpreted as described
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# above.
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def find(conditions)
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match(conditions) && self
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end
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# Returns non-+nil+ if this node meets the given conditions, or +nil+
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# otherwise. See the discussion of #find for the valid conditions.
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def match(conditions)
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case conditions
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when String
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@content == conditions
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when Regexp
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@content =~ conditions
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when Hash
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conditions = validate_conditions(conditions)
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# Text nodes only have :content, :parent, :ancestor
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unless (conditions.keys - [:content, :parent, :ancestor]).empty?
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return false
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end
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match(conditions[:content])
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else
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nil
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end
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end
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def ==(node)
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return false unless super
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content == node.content
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end
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end
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# A CDATA node is simply a text node with a specialized way of displaying
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# itself.
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class CDATA < Text #:nodoc:
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def to_s
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"<![CDATA[#{super}]>"
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end
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end
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# A Tag is any node that represents markup. It may be an opening tag, a
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# closing tag, or a self-closing tag. It has a name, and may have a hash of
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# attributes.
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class Tag < Node #:nodoc:
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# Either +nil+, <tt>:close</tt>, or <tt>:self</tt>
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attr_reader :closing
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# Either +nil+, or a hash of attributes for this node.
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attr_reader :attributes
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# The name of this tag.
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attr_reader :name
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# Create a new node as a child of the given parent, using the given content
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# to describe the node. It will be parsed and the node name, attributes and
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# closing status extracted.
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def initialize(parent, line, pos, name, attributes, closing)
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super(parent, line, pos)
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@name = name
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@attributes = attributes
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@closing = closing
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end
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# A convenience for obtaining an attribute of the node. Returns +nil+ if
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# the node has no attributes.
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def [](attr)
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@attributes ? @attributes[attr] : nil
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end
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# Returns non-+nil+ if this tag can contain child nodes.
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def childless?(xml = false)
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return false if xml && @closing.nil?
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!@closing.nil? ||
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@name =~ /^(img|br|hr|link|meta|area|base|basefont|
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col|frame|input|isindex|param)$/ox
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end
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# Returns a textual representation of the node
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def to_s
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if @closing == :close
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"</#{@name}>"
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else
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s = "<#{@name}"
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@attributes.each do |k,v|
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s << " #{k}"
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s << "=\"#{v}\"" if String === v
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end
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s << " /" if @closing == :self
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s << ">"
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@children.each { |child| s << child.to_s }
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s << "</#{@name}>" if @closing != :self && !@children.empty?
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s
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end
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end
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# If either the node or any of its children meet the given conditions, the
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# matching node is returned. Otherwise, +nil+ is returned. (See the
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# description of the valid conditions in the +match+ method.)
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def find(conditions)
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match(conditions) && self || super
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end
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# Returns +true+, indicating that this node represents an HTML tag.
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def tag?
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true
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end
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# Returns +true+ if the node meets any of the given conditions. The
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# +conditions+ parameter must be a hash of any of the following keys
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# (all are optional):
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#
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# * <tt>:tag</tt>: the node name must match the corresponding value
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# * <tt>:attributes</tt>: a hash. The node's values must match the
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# corresponding values in the hash.
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# * <tt>:parent</tt>: a hash. The node's parent must match the
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# corresponding hash.
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# * <tt>:child</tt>: a hash. At least one of the node's immediate children
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# must meet the criteria described by the hash.
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# * <tt>:ancestor</tt>: a hash. At least one of the node's ancestors must
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# meet the criteria described by the hash.
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# * <tt>:descendant</tt>: a hash. At least one of the node's descendants
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# must meet the criteria described by the hash.
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# * <tt>:sibling</tt>: a hash. At least one of the node's siblings must
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# meet the criteria described by the hash.
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# * <tt>:after</tt>: a hash. The node must be after any sibling meeting
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# the criteria described by the hash, and at least one sibling must match.
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# * <tt>:before</tt>: a hash. The node must be before any sibling meeting
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# the criteria described by the hash, and at least one sibling must match.
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# * <tt>:children</tt>: a hash, for counting children of a node. Accepts the
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# keys:
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# ** <tt>:count</tt>: either a number or a range which must equal (or
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# include) the number of children that match.
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# ** <tt>:less_than</tt>: the number of matching children must be less than
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# this number.
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# ** <tt>:greater_than</tt>: the number of matching children must be
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# greater than this number.
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# ** <tt>:only</tt>: another hash consisting of the keys to use
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# to match on the children, and only matching children will be
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# counted.
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#
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# Conditions are matched using the following algorithm:
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#
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# * if the condition is a string, it must be a substring of the value.
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# * if the condition is a regexp, it must match the value.
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# * if the condition is a number, the value must match number.to_s.
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# * if the condition is +true+, the value must not be +nil+.
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# * if the condition is +false+ or +nil+, the value must be +nil+.
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#
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# Usage:
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#
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# # test if the node is a "span" tag
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# node.match :tag => "span"
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#
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# # test if the node's parent is a "div"
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# node.match :parent => { :tag => "div" }
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#
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# # test if any of the node's ancestors are "table" tags
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# node.match :ancestor => { :tag => "table" }
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#
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# # test if any of the node's immediate children are "em" tags
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# node.match :child => { :tag => "em" }
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#
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# # test if any of the node's descendants are "strong" tags
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# node.match :descendant => { :tag => "strong" }
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#
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# # test if the node has between 2 and 4 span tags as immediate children
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# node.match :children => { :count => 2..4, :only => { :tag => "span" } }
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#
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# # get funky: test to see if the node is a "div", has a "ul" ancestor
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# # and an "li" parent (with "class" = "enum"), and whether or not it has
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# # a "span" descendant that contains # text matching /hello world/:
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# node.match :tag => "div",
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# :ancestor => { :tag => "ul" },
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# :parent => { :tag => "li",
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# :attributes => { :class => "enum" } },
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# :descendant => { :tag => "span",
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# :child => /hello world/ }
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def match(conditions)
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conditions = validate_conditions(conditions)
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# check content of child nodes
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if conditions[:content]
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if children.empty?
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return false unless match_condition("", conditions[:content])
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else
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return false unless children.find { |child| child.match(conditions[:content]) }
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end
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end
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# test the name
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return false unless match_condition(@name, conditions[:tag]) if conditions[:tag]
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# test attributes
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(conditions[:attributes] || {}).each do |key, value|
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return false unless match_condition(self[key], value)
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end
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# test parent
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return false unless parent.match(conditions[:parent]) if conditions[:parent]
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# test children
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return false unless children.find { |child| child.match(conditions[:child]) } if conditions[:child]
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# test ancestors
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if conditions[:ancestor]
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return false unless catch :found do
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p = self
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throw :found, true if p.match(conditions[:ancestor]) while p = p.parent
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end
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end
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# test descendants
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if conditions[:descendant]
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return false unless children.find do |child|
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# test the child
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child.match(conditions[:descendant]) ||
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# test the child's descendants
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child.match(:descendant => conditions[:descendant])
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end
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end
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# count children
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if opts = conditions[:children]
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matches = children.select do |c|
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(c.kind_of?(HTML::Tag) and (c.closing == :self or ! c.childless?))
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end
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matches = matches.select { |c| c.match(opts[:only]) } if opts[:only]
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opts.each do |key, value|
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next if key == :only
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case key
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when :count
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if Integer === value
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return false if matches.length != value
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else
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return false unless value.include?(matches.length)
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end
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when :less_than
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return false unless matches.length < value
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when :greater_than
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return false unless matches.length > value
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else raise "unknown count condition #{key}"
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end
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end
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end
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# test siblings
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if conditions[:sibling] || conditions[:before] || conditions[:after]
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siblings = parent ? parent.children : []
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self_index = siblings.index(self)
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if conditions[:sibling]
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return false unless siblings.detect do |s|
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s != self && s.match(conditions[:sibling])
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end
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end
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if conditions[:before]
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return false unless siblings[self_index+1..-1].detect do |s|
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s != self && s.match(conditions[:before])
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end
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end
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if conditions[:after]
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return false unless siblings[0,self_index].detect do |s|
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s != self && s.match(conditions[:after])
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end
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end
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end
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true
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end
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def ==(node)
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return false unless super
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return false unless closing == node.closing && self.name == node.name
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attributes == node.attributes
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end
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private
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# Match the given value to the given condition.
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def match_condition(value, condition)
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case condition
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when String
|
||||
value && value == condition
|
||||
when Regexp
|
||||
value && value.match(condition)
|
||||
when Numeric
|
||||
value == condition.to_s
|
||||
when true
|
||||
!value.nil?
|
||||
when false, nil
|
||||
value.nil?
|
||||
else
|
||||
false
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
|
|
@ -6,7 +6,7 @@ module Sanitize
|
|||
# Based heavily on Sam Ruby's code in the Universal FeedParser.
|
||||
|
||||
require 'html/tokenizer'
|
||||
require 'html/node'
|
||||
require 'node'
|
||||
|
||||
acceptable_elements = ['a', 'abbr', 'acronym', 'address', 'area', 'b',
|
||||
'big', 'blockquote', 'br', 'button', 'caption', 'center', 'cite',
|
||||
|
|
@ -125,14 +125,15 @@ module Sanitize
|
|||
new_text = ""
|
||||
|
||||
while token = tokenizer.next
|
||||
node = HTML::Node.parse(nil, 0, 0, token, false)
|
||||
new_text << case node
|
||||
when HTML::Tag
|
||||
node = XHTML::Node.parse(nil, 0, 0, token, false)
|
||||
new_text << case node.tag?
|
||||
when true
|
||||
if ALLOWED_ELEMENTS.include?(node.name)
|
||||
if node.closing != :close
|
||||
node.attributes.delete_if { |attr,v| !ALLOWED_ATTRIBUTES.include?(attr) }
|
||||
%w(href src).each do |attr|
|
||||
node.attributes.delete attr if node.attributes[attr] =~ /^\s*javascript:/i
|
||||
val_unescaped = CGI.unescapeHTML(node.attributes[attr].to_s).gsub(/[\000-\040\177-\240]+/,'')
|
||||
node.attributes.delete attr if val_unescaped =~ /^javascript:/i
|
||||
end
|
||||
if node.attributes['style']
|
||||
node.attributes['style'] = sanitize_css(node.attributes['style'])
|
||||
|
|
@ -174,7 +175,7 @@ module Sanitize
|
|||
goodval = true
|
||||
val.split().each do |keyword|
|
||||
if !ALLOWED_CSS_KEYWORDS.include?(keyword) and
|
||||
keyword !~ /^(#[0-9a-f]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|\d{0,2}\.?\d{0,2}(cm|em|ex|in|mm|pc|pt|px|%|,|\))?)$/
|
||||
keyword !~ /^(#[0-9a-f]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|\d{0,2}\.?\d{0,2}(cm|em|ex|in|mm|pc|pt|px|%|,|\))?)$/
|
||||
goodval = false
|
||||
end
|
||||
end
|
||||
|
|
|
|||
143
test/unit/sanitize.rb
Normal file
143
test/unit/sanitize.rb
Normal file
|
|
@ -0,0 +1,143 @@
|
|||
#!/usr/bin/env ruby
|
||||
|
||||
require File.expand_path(File.join(File.dirname(__FILE__), '/../test_helper'))
|
||||
require 'sanitize'
|
||||
|
||||
class SanitizeTest < Test::Unit::TestCase
|
||||
include Sanitize
|
||||
|
||||
def setup
|
||||
|
||||
end
|
||||
|
||||
Sanitize::ALLOWED_ELEMENTS.each do |tag_name|
|
||||
define_method "test_should_allow_#{tag_name}_tag" do
|
||||
assert_equal "<#{tag_name} title=\"1\">foo <bad>bar</bad> baz</#{tag_name}>",
|
||||
sanitize_html("<#{tag_name} title='1'>foo <bad>bar</bad> baz</#{tag_name}>")
|
||||
end
|
||||
end
|
||||
|
||||
Sanitize::ALLOWED_ELEMENTS.each do |tag_name|
|
||||
define_method "test_should_forbid_#{tag_name.upcase}_tag" do
|
||||
assert_equal "<#{tag_name.upcase} title=\"1\">foo <bad>bar</bad> baz</#{tag_name.upcase}>",
|
||||
sanitize_html("<#{tag_name.upcase} title='1'>foo <bad>bar</bad> baz</#{tag_name.upcase}>")
|
||||
end
|
||||
end
|
||||
|
||||
Sanitize::ALLOWED_ATTRIBUTES.each do |attribute_name|
|
||||
define_method "test_should_allow_#{attribute_name}_attribute" do
|
||||
assert_equal "<p #{attribute_name}=\"display: none;\">foo <bad>bar</bad> baz</p>",
|
||||
sanitize_html("<p #{attribute_name}='display: none;'>foo <bad>bar</bad> baz</p>")
|
||||
end
|
||||
end
|
||||
|
||||
Sanitize::ALLOWED_ATTRIBUTES.each do |attribute_name|
|
||||
define_method "test_should_forbid_#{attribute_name.upcase}_attribute" do
|
||||
assert_equal "<p>foo <bad>bar</bad> baz</p>",
|
||||
sanitize_html("<p #{attribute_name.upcase}='display: none;'>foo <bad>bar</bad> baz</p>")
|
||||
end
|
||||
end
|
||||
|
||||
def test_should_allow_anchors
|
||||
assert_equal "<a href=\"foo\"><script>baz</script></a>",
|
||||
sanitize_html("<a href='foo' onclick='bar'><script>baz</script></a>")
|
||||
end
|
||||
|
||||
%w(src width height alt).each do |img_attr|
|
||||
define_method "test_should_allow_image_#{img_attr}_attribute" do
|
||||
assert_equal "<img #{img_attr}=\"foo\" />",
|
||||
sanitize_html("<img #{img_attr}='foo' onclick='bar' />")
|
||||
end
|
||||
end
|
||||
|
||||
def test_should_handle_non_html
|
||||
assert_equal 'abc', sanitize_html("abc")
|
||||
end
|
||||
|
||||
def test_should_handle_blank_text
|
||||
assert_equal '', sanitize_html('')
|
||||
end
|
||||
|
||||
[%w(img src), %w(a href)].each do |(tag, attr)|
|
||||
define_method "test_should_strip_#{attr}_attribute_in_#{tag}_with_bad_protocols" do
|
||||
assert_equal %(<#{tag} title="1">boo</#{tag}>), sanitize_html(%(<#{tag} #{attr}="javascript:XSS" title="1">boo</#{tag}>))
|
||||
end
|
||||
end
|
||||
|
||||
[%w(img src), %w(a href)].each do |(tag, attr)|
|
||||
define_method "test_should_strip_#{attr}_attribute_in_#{tag}_with_bad_protocols_and_whitespace" do
|
||||
assert_equal %(<#{tag} title="1">boo</#{tag}>), sanitize_html(%(<#{tag} #{attr}=" javascript:XSS" title="1">boo</#{tag}>))
|
||||
end
|
||||
end
|
||||
|
||||
[%(<img src="javascript:alert('XSS');" />),
|
||||
%(<img src=javascript:alert('XSS') />),
|
||||
%(<img src="JaVaScRiPt:alert('XSS')" />),
|
||||
%(<img src='javascript:alert("XSS")' />),
|
||||
%(<img src='javascript:alert(String.fromCharCode(88,83,83))' />),
|
||||
%(<img src='javascript:alert('XSS')' />),
|
||||
%(<img src='javascript:alert('XSS')' />),
|
||||
%(<img src='javascript:alert('XSS')' />),
|
||||
%(<img src="jav\tascript:alert('XSS');" />),
|
||||
%(<img src="jav	ascript:alert('XSS');" />),
|
||||
%(<img src="jav
ascript:alert('XSS');" />),
|
||||
%(<img src="jav
ascript:alert('XSS');" />),
|
||||
%(<img src="  javascript:alert('XSS');" />),
|
||||
%(<img src=" javascript:alert('XSS');" />),
|
||||
%(<img src=" javascript:alert('XSS');" />)].each_with_index do |img_hack, i|
|
||||
define_method "test_should_not_fall_for_xss_image_hack_#{i}" do
|
||||
assert_equal "<img />", sanitize_html(img_hack)
|
||||
end
|
||||
end
|
||||
|
||||
def test_should_sanitize_tag_broken_up_by_null
|
||||
assert_equal "<scr>alert(\"XSS\")</scr>", sanitize_html(%(<scr\0ipt>alert(\"XSS\")</scr\0ipt>))
|
||||
end
|
||||
|
||||
def test_should_sanitize_invalid_script_tag
|
||||
assert_equal "<script /></script>", sanitize_html(%(<script/XSS SRC="http://ha.ckers.org/xss.js"></script>))
|
||||
end
|
||||
|
||||
def test_should_sanitize_script_tag_with_multiple_open_brackets
|
||||
assert_equal "<<script>alert(\"XSS\");//<</script>", sanitize_html(%(<<script>alert("XSS");//<</script>))
|
||||
assert_equal %(<iframe src="http:" /><), sanitize_html(%(<iframe src=http://ha.ckers.org/scriptlet.html\n<))
|
||||
end
|
||||
|
||||
def test_should_sanitize_unclosed_script
|
||||
assert_equal "<script src=\"http:\" /><b>", sanitize_html(%(<script src=http://ha.ckers.org/xss.js?<b>))
|
||||
end
|
||||
|
||||
def test_should_sanitize_half_open_scripts
|
||||
assert_equal "<img>", sanitize_html(%(<img src="javascript:alert('XSS')"))
|
||||
end
|
||||
|
||||
def test_should_not_fall_for_ridiculous_hack
|
||||
img_hack = %(<img\nsrc\n=\n"\nj\na\nv\na\ns\nc\nr\ni\np\nt\n:\na\nl\ne\nr\nt\n(\n'\nX\nS\nS\n'\n)\n"\n />)
|
||||
assert_equal "<img />", sanitize_html(img_hack)
|
||||
end
|
||||
|
||||
def test_platypus
|
||||
assert_equal %(<a href=\"http://www.ragingplatypus.com/\" style=\"display: block; width: 100%; height: 100%; background-color: black; background-image: ; background-x: center; background-y: center;\">never trust your upstream platypus</a>),
|
||||
sanitize_html(%(<a href="http://www.ragingplatypus.com/" style="display:block; position:absolute; left:0; top:0; width:100%; height:100%; z-index:1; background-color:black; background-image:url(http://www.ragingplatypus.com/i/cam-full.jpg); background-x:center; background-y:center; background-repeat:repeat;">never trust your upstream platypus</a>))
|
||||
end
|
||||
|
||||
def test_xul
|
||||
assert_equal %(<p style="">fubar</p>),
|
||||
sanitize_html(%(<p style="-moz-binding:url('http://ha.ckers.org/xssmoz.xml#xss')">fubar</p>))
|
||||
end
|
||||
|
||||
def test_input_image
|
||||
assert_equal %(<input type="image" />),
|
||||
sanitize_html(%(<input type="image" src="javascript:alert('XSS');" />))
|
||||
end
|
||||
|
||||
def test_non_alpha_non_digit
|
||||
assert_equal "<script /></script>",
|
||||
sanitize_html(%(<script/XSS src="http://ha.ckers.org/xss.js"></script>))
|
||||
assert_equal "<a>foo</a>",
|
||||
sanitize_html('<a onclick!#$%&()*~+-_.,:;?@[/|\]^`=alert("XSS")>foo</a>')
|
||||
assert_equal "<img />",
|
||||
sanitize_html('<img/src="http://ha.ckers.org/xss.js"/>')
|
||||
end
|
||||
|
||||
end
|
||||
Loading…
Reference in a new issue