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rubygem-rails-html-sanitizer.30520
0002_CVE-2022-23517_CVE-2022-23518_CVE-2022-235...
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File 0002_CVE-2022-23517_CVE-2022-23518_CVE-2022-23519_CVE-2022-23520.patch of Package rubygem-rails-html-sanitizer.30520
diff --color -rubN rails-html-sanitizer-1.0.4-ori-2/lib/crass/parser.rb rails-html-sanitizer-1.0.4/lib/crass/parser.rb --- rails-html-sanitizer-1.0.4-ori-2/lib/crass/parser.rb 1970-01-01 01:00:00.000000000 +0100 +++ rails-html-sanitizer-1.0.4/lib/crass/parser.rb 2015-04-18 06:16:46.000000000 +0200 @@ -0,0 +1,648 @@ +# encoding: utf-8 +require_relative 'token-scanner' +require_relative 'tokenizer' + +module Crass + + # Parses a CSS string or list of tokens. + # + # 5. http://dev.w3.org/csswg/css-syntax/#parsing + class Parser + BLOCK_END_TOKENS = { + :'{' => :'}', + :'[' => :']', + :'(' => :')' + } + + # -- Class Methods --------------------------------------------------------- + + # Parses CSS properties (such as the contents of an HTML element's `style` + # attribute) and returns a parse tree. + # + # See {Tokenizer#initialize} for _options_. + # + # 5.3.6. http://dev.w3.org/csswg/css-syntax/#parse-a-list-of-declarations + def self.parse_properties(input, options = {}) + Parser.new(input, options).parse_properties + end + + # Parses CSS rules (such as the content of a `@media` block) and returns a + # parse tree. The only difference from {parse_stylesheet} is that CDO/CDC + # nodes (`<!--` and `-->`) aren't ignored. + # + # See {Tokenizer#initialize} for _options_. + # + # 5.3.3. http://dev.w3.org/csswg/css-syntax/#parse-a-list-of-rules + def self.parse_rules(input, options = {}) + parser = Parser.new(input, options) + rules = parser.consume_rules + + rules.map do |rule| + if rule[:node] == :qualified_rule + parser.create_style_rule(rule) + else + rule + end + end + end + + # Parses a CSS stylesheet and returns a parse tree. + # + # See {Tokenizer#initialize} for _options_. + # + # 5.3.2. http://dev.w3.org/csswg/css-syntax/#parse-a-stylesheet + def self.parse_stylesheet(input, options = {}) + parser = Parser.new(input, options) + rules = parser.consume_rules(:top_level => true) + + rules.map do |rule| + if rule[:node] == :qualified_rule + parser.create_style_rule(rule) + else + rule + end + end + end + + # Converts a node or array of nodes into a CSS string based on their + # original tokenized input. + # + # Options: + # + # * **:exclude_comments** - When `true`, comments will be excluded. + # + def self.stringify(nodes, options = {}) + nodes = [nodes] unless nodes.is_a?(Array) + string = '' + + nodes.each do |node| + next if node.nil? + + case node[:node] + when :at_rule + string << '@' + string << node[:name] + string << self.stringify(node[:prelude], options) + + if node[:block] + string << '{' << self.stringify(node[:block], options) << '}' + else + string << ';' + end + + when :comment + string << node[:raw] unless options[:exclude_comments] + + when :simple_block + string << node[:start] + string << self.stringify(node[:value], options) + string << node[:end] + + when :style_rule + string << self.stringify(node[:selector][:tokens], options) + string << '{' << self.stringify(node[:children], options) << '}' + + else + if node.key?(:raw) + string << node[:raw] + elsif node.key?(:tokens) + string << self.stringify(node[:tokens], options) + end + end + end + + string + end + + # -- Instance Methods ------------------------------------------------------ + + # {TokenScanner} wrapping the tokens generated from this parser's input. + attr_reader :tokens + + # Initializes a parser based on the given _input_, which may be a CSS string + # or an array of tokens. + # + # See {Tokenizer#initialize} for _options_. + def initialize(input, options = {}) + unless input.kind_of?(Enumerable) + input = Tokenizer.tokenize(input, options) + end + + @tokens = TokenScanner.new(input) + end + + # Consumes an at-rule and returns it. + # + # 5.4.2. http://dev.w3.org/csswg/css-syntax-3/#consume-at-rule + def consume_at_rule(input = @tokens) + rule = {} + + rule[:tokens] = input.collect do + rule[:name] = input.consume[:value] + rule[:prelude] = [] + + while token = input.consume + node = token[:node] + + if node == :comment # Non-standard. + next + + elsif node == :semicolon + break + + elsif node === :'{' + # Note: The spec says the block should _be_ the consumed simple + # block, but Simon Sapin's CSS parsing tests and tinycss2 expect + # only the _value_ of the consumed simple block here. I assume I'm + # interpreting the spec too literally, so I'm going with the + # tinycss2 behavior. + rule[:block] = consume_simple_block(input)[:value] + break + + elsif node == :simple_block && token[:start] == '{' + # Note: The spec says the block should _be_ the simple block, but + # Simon Sapin's CSS parsing tests and tinycss2 expect only the + # _value_ of the simple block here. I assume I'm interpreting the + # spec too literally, so I'm going with the tinycss2 behavior. + rule[:block] = token[:value] + break + + else + input.reconsume + rule[:prelude] << consume_component_value(input) + end + end + end + + create_node(:at_rule, rule) + end + + # Consumes a component value and returns it, or `nil` if there are no more + # tokens. + # + # 5.4.6. http://dev.w3.org/csswg/css-syntax-3/#consume-a-component-value + def consume_component_value(input = @tokens) + return nil unless token = input.consume + + case token[:node] + when :'{', :'[', :'(' + consume_simple_block(input) + + when :function + if token.key?(:name) + # This is a parsed function, not a function token. This step isn't + # mentioned in the spec, but it's necessary to avoid re-parsing + # functions that have already been parsed. + token + else + consume_function(input) + end + + else + token + end + end + + # Consumes a declaration and returns it, or `nil` on parse error. + # + # 5.4.5. http://dev.w3.org/csswg/css-syntax-3/#consume-a-declaration + def consume_declaration(input = @tokens) + declaration = {} + value = [] + + declaration[:tokens] = input.collect do + declaration[:name] = input.consume[:value] + + next_token = input.peek + + while next_token && next_token[:node] == :whitespace + input.consume + next_token = input.peek + end + + unless next_token && next_token[:node] == :colon + # Parse error. + # + # Note: The spec explicitly says to return nothing here, but Simon + # Sapin's CSS parsing tests expect an error node. + return create_node(:error, :value => 'invalid') + end + + input.consume + + until input.peek.nil? + value << consume_component_value(input) + end + end + + # Look for !important. + important_tokens = value.reject {|token| + node = token[:node] + node == :whitespace || node == :comment || node == :semicolon + }.last(2) + + if important_tokens.size == 2 && + important_tokens[0][:node] == :delim && + important_tokens[0][:value] == '!' && + important_tokens[1][:node] == :ident && + important_tokens[1][:value].downcase == 'important' + + declaration[:important] = true + excl_index = value.index(important_tokens[0]) + + # Technically the spec doesn't require us to trim trailing tokens after + # the !important, but Simon Sapin's CSS parsing tests expect it and + # tinycss2 does it, so we'll go along with the cool kids. + value.slice!(excl_index, value.size - excl_index) + else + declaration[:important] = false + end + + declaration[:value] = value + create_node(:declaration, declaration) + end + + # Consumes a list of declarations and returns them. + # + # By default, the returned list may include `:comment`, `:semicolon`, and + # `:whitespace` nodes, which is non-standard. + # + # Options: + # + # * **:strict** - Set to `true` to exclude non-standard `:comment`, + # `:semicolon`, and `:whitespace` nodes. + # + # 5.4.4. http://dev.w3.org/csswg/css-syntax/#consume-a-list-of-declarations + def consume_declarations(input = @tokens, options = {}) + declarations = [] + + while token = input.consume + case token[:node] + + # Non-standard: Preserve comments, semicolons, and whitespace. + when :comment, :semicolon, :whitespace + declarations << token unless options[:strict] + + when :at_keyword + # When parsing a style rule, this is a parse error. Otherwise it's + # not. + input.reconsume + declarations << consume_at_rule(input) + + when :ident + decl_tokens = [token] + + while next_token = input.peek + break if next_token[:node] == :semicolon + decl_tokens << consume_component_value(input) + end + + if decl = consume_declaration(TokenScanner.new(decl_tokens)) + declarations << decl + end + + else + # Parse error (invalid property name, etc.). + # + # Note: The spec doesn't say we should append anything to the list of + # declarations here, but Simon Sapin's CSS parsing tests expect an + # error node. + declarations << create_node(:error, :value => 'invalid') + input.reconsume + + while next_token = input.peek + break if next_token[:node] == :semicolon + consume_component_value(input) + end + end + end + + declarations + end + + # Consumes a function and returns it. + # + # 5.4.8. http://dev.w3.org/csswg/css-syntax-3/#consume-a-function + def consume_function(input = @tokens) + function = { + :name => input.current[:value], + :value => [], + :tokens => [input.current] # Non-standard, used for serialization. + } + + function[:tokens].concat(input.collect { + while token = input.consume + case token[:node] + when :')' + break + + # Non-standard. + when :comment + next + + else + input.reconsume + function[:value] << consume_component_value(input) + end + end + }) + + create_node(:function, function) + end + + # Consumes a qualified rule and returns it, or `nil` if a parse error + # occurs. + # + # 5.4.3. http://dev.w3.org/csswg/css-syntax-3/#consume-a-qualified-rule + def consume_qualified_rule(input = @tokens) + rule = {:prelude => []} + + rule[:tokens] = input.collect do + while true + unless token = input.consume + # Parse error. + # + # Note: The spec explicitly says to return nothing here, but Simon + # Sapin's CSS parsing tests expect an error node. + return create_node(:error, :value => 'invalid') + end + + if token[:node] == :'{' + # Note: The spec says the block should _be_ the consumed simple + # block, but Simon Sapin's CSS parsing tests and tinycss2 expect + # only the _value_ of the consumed simple block here. I assume I'm + # interpreting the spec too literally, so I'm going with the + # tinycss2 behavior. + rule[:block] = consume_simple_block(input)[:value] + break + elsif token[:node] == :simple_block && token[:start] == '{' + # Note: The spec says the block should _be_ the simple block, but + # Simon Sapin's CSS parsing tests and tinycss2 expect only the + # _value_ of the simple block here. I assume I'm interpreting the + # spec too literally, so I'm going with the tinycss2 behavior. + rule[:block] = token[:value] + break + else + input.reconsume + rule[:prelude] << consume_component_value(input) + end + end + end + + create_node(:qualified_rule, rule) + end + + # Consumes a list of rules and returns them. + # + # 5.4.1. http://dev.w3.org/csswg/css-syntax/#consume-a-list-of-rules + def consume_rules(flags = {}) + rules = [] + + while token = @tokens.consume + case token[:node] + # Non-standard. Spec says to discard comments and whitespace, but we + # keep them so we can serialize faithfully. + when :comment, :whitespace + rules << token + + when :cdc, :cdo + unless flags[:top_level] + @tokens.reconsume + rule = consume_qualified_rule + rules << rule if rule + end + + when :at_keyword + @tokens.reconsume + rule = consume_at_rule + rules << rule if rule + + else + @tokens.reconsume + rule = consume_qualified_rule + rules << rule if rule + end + end + + rules + end + + # Consumes and returns a simple block associated with the current input + # token. + # + # 5.4.7. http://dev.w3.org/csswg/css-syntax/#consume-a-simple-block + def consume_simple_block(input = @tokens) + start_token = input.current[:node] + end_token = BLOCK_END_TOKENS[start_token] + + block = { + :start => start_token.to_s, + :end => end_token.to_s, + :value => [], + :tokens => [input.current] # Non-standard. Used for serialization. + } + + block[:tokens].concat(input.collect do + while token = input.consume + break if token[:node] == end_token + + input.reconsume + block[:value] << consume_component_value(input) + end + end) + + create_node(:simple_block, block) + end + + # Creates and returns a new parse node with the given _properties_. + def create_node(type, properties = {}) + {:node => type}.merge!(properties) + end + + # Parses the given _input_ tokens into a selector node and returns it. + # + # Doesn't bother splitting the selector list into individual selectors or + # validating them. Feel free to do that yourself! It'll be fun! + def create_selector(input) + create_node(:selector, + :value => parse_value(input), + :tokens => input) + end + + # Creates a `:style_rule` node from the given qualified _rule_, and returns + # it. + def create_style_rule(rule) + create_node(:style_rule, + :selector => create_selector(rule[:prelude]), + :children => parse_properties(rule[:block])) + end + + # Parses a single component value and returns it. + # + # 5.3.7. http://dev.w3.org/csswg/css-syntax-3/#parse-a-component-value + def parse_component_value(input = @tokens) + input = TokenScanner.new(input) unless input.is_a?(TokenScanner) + + while input.peek && input.peek[:node] == :whitespace + input.consume + end + + if input.peek.nil? + return create_node(:error, :value => 'empty') + end + + value = consume_component_value(input) + + while input.peek && input.peek[:node] == :whitespace + input.consume + end + + if input.peek.nil? + value + else + create_node(:error, :value => 'extra-input') + end + end + + # Parses a list of component values and returns an array of parsed tokens. + # + # 5.3.8. http://dev.w3.org/csswg/css-syntax/#parse-a-list-of-component-values + def parse_component_values(input = @tokens) + input = TokenScanner.new(input) unless input.is_a?(TokenScanner) + tokens = [] + + while token = consume_component_value(input) + tokens << token + end + + tokens + end + + # Parses a single declaration and returns it. + # + # 5.3.5. http://dev.w3.org/csswg/css-syntax/#parse-a-declaration + def parse_declaration(input = @tokens) + input = TokenScanner.new(input) unless input.is_a?(TokenScanner) + + while input.peek && input.peek[:node] == :whitespace + input.consume + end + + if input.peek.nil? + # Syntax error. + return create_node(:error, :value => 'empty') + elsif input.peek[:node] != :ident + # Syntax error. + return create_node(:error, :value => 'invalid') + end + + if decl = consume_declaration(input) + return decl + end + + # Syntax error. + create_node(:error, :value => 'invalid') + end + + # Parses a list of declarations and returns them. + # + # See {#consume_declarations} for _options_. + # + # 5.3.6. http://dev.w3.org/csswg/css-syntax/#parse-a-list-of-declarations + def parse_declarations(input = @tokens, options = {}) + input = TokenScanner.new(input) unless input.is_a?(TokenScanner) + consume_declarations(input, options) + end + + # Parses a list of declarations and returns an array of `:property` nodes + # (and any non-declaration nodes that were in the input). This is useful for + # parsing the contents of an HTML element's `style` attribute. + def parse_properties(input = @tokens) + properties = [] + + parse_declarations(input).each do |decl| + unless decl[:node] == :declaration + properties << decl + next + end + + children = decl[:value].dup + children.pop if children.last && children.last[:node] == :semicolon + + properties << create_node(:property, + :name => decl[:name], + :value => parse_value(decl[:value]), + :children => children, + :important => decl[:important], + :tokens => decl[:tokens]) + end + + properties + end + + # Parses a single rule and returns it. + # + # 5.3.4. http://dev.w3.org/csswg/css-syntax-3/#parse-a-rule + def parse_rule(input = @tokens) + input = TokenScanner.new(input) unless input.is_a?(TokenScanner) + + while input.peek && input.peek[:node] == :whitespace + input.consume + end + + if input.peek.nil? + # Syntax error. + return create_node(:error, :value => 'empty') + elsif input.peek[:node] == :at_keyword + rule = consume_at_rule(input) + else + rule = consume_qualified_rule(input) + end + + while input.peek && input.peek[:node] == :whitespace + input.consume + end + + if input.peek.nil? + rule + else + # Syntax error. + create_node(:error, :value => 'extra-input') + end + end + + # Returns the unescaped value of a selector name or property declaration. + def parse_value(nodes) + nodes = [nodes] unless nodes.is_a?(Array) + string = '' + + nodes.each do |node| + case node[:node] + when :comment, :semicolon + next + + when :at_keyword, :ident + string << node[:value] + + when :function + if node[:value].is_a?(String) + string << node[:value] + string << '(' + else + string << parse_value(node[:tokens]) + end + + else + if node.key?(:raw) + string << node[:raw] + elsif node.key?(:tokens) + string << parse_value(node[:tokens]) + end + end + end + + string.strip + end + end + +end diff --color -rubN rails-html-sanitizer-1.0.4-ori-2/lib/crass/scanner.rb rails-html-sanitizer-1.0.4/lib/crass/scanner.rb --- rails-html-sanitizer-1.0.4-ori-2/lib/crass/scanner.rb 1970-01-01 01:00:00.000000000 +0100 +++ rails-html-sanitizer-1.0.4/lib/crass/scanner.rb 2015-04-18 06:16:46.000000000 +0200 @@ -0,0 +1,125 @@ +# encoding: utf-8 +require 'strscan' + +module Crass + + # Similar to a StringScanner, but with extra functionality needed to tokenize + # CSS while preserving the original text. + class Scanner + # Current character, or `nil` if the scanner hasn't yet consumed a + # character, or is at the end of the string. + attr_reader :current + + # Current marker position. Use {#marked} to get the substring between + # {#marker} and {#pos}. + attr_accessor :marker + + # Position of the next character that will be consumed. This is a character + # position, not a byte position, so it accounts for multi-byte characters. + attr_accessor :pos + + # String being scanned. + attr_reader :string + + # Creates a Scanner instance for the given _input_ string or IO instance. + def initialize(input) + @string = input.is_a?(IO) ? input.read : input.to_s + @scanner = StringScanner.new(@string) + + reset + end + + # Consumes the next character and returns it, advancing the pointer, or + # an empty string if the end of the string has been reached. + def consume + if @pos < @len + @pos += 1 + @current = @scanner.getch + else + '' + end + end + + # Consumes the rest of the string and returns it, advancing the pointer to + # the end of the string. Returns an empty string is the end of the string + # has already been reached. + def consume_rest + result = @scanner.rest + + @current = result[-1] + @pos = @len + + result + end + + # Returns `true` if the end of the string has been reached, `false` + # otherwise. + def eos? + @pos == @len + end + + # Sets the marker to the position of the next character that will be + # consumed. + def mark + @marker = @pos + end + + # Returns the substring between {#marker} and {#pos}, without altering the + # pointer. + def marked + if result = @string[@marker, @pos - @marker] + result + else + '' + end + end + + # Returns up to _length_ characters starting at the current position, but + # doesn't consume them. The number of characters returned may be less than + # _length_ if the end of the string is reached. + def peek(length = 1) + @string[pos, length] + end + + # Moves the pointer back one character without changing the value of + # {#current}. The next call to {#consume} will re-consume the current + # character. + def reconsume + @scanner.unscan + @pos -= 1 if @pos > 0 + end + + # Resets the pointer to the beginning of the string. + def reset + @current = nil + @len = @string.size + @marker = 0 + @pos = 0 + end + + # Tries to match _pattern_ at the current position. If it matches, the + # matched substring will be returned and the pointer will be advanced. + # Otherwise, `nil` will be returned. + def scan(pattern) + if match = @scanner.scan(pattern) + @pos += match.size + @current = match[-1] + end + + match + end + + # Scans the string until the _pattern_ is matched. Returns the substring up + # to and including the end of the match, and advances the pointer. If there + # is no match, `nil` is returned and the pointer is not advanced. + def scan_until(pattern) + if match = @scanner.scan_until(pattern) + @pos += match.size + @current = match[-1] + end + + match + end + end + +end diff --color -rubN rails-html-sanitizer-1.0.4-ori-2/lib/crass/tokenizer.rb rails-html-sanitizer-1.0.4/lib/crass/tokenizer.rb --- rails-html-sanitizer-1.0.4-ori-2/lib/crass/tokenizer.rb 1970-01-01 01:00:00.000000000 +0100 +++ rails-html-sanitizer-1.0.4/lib/crass/tokenizer.rb 2015-04-18 06:16:46.000000000 +0200 @@ -0,0 +1,689 @@ +# encoding: utf-8 +require_relative 'scanner' + +module Crass + + # Tokenizes a CSS string. + # + # 4. http://dev.w3.org/csswg/css-syntax/#tokenization + class Tokenizer + RE_COMMENT_CLOSE = /\*\// + RE_DIGIT = /[0-9]+/ + RE_ESCAPE = /\\[^\n]/ + RE_HEX = /[0-9A-Fa-f]{1,6}/ + RE_NAME = /[0-9A-Za-z_\u0080-\u{10ffff}-]+/ + RE_NAME_START = /[A-Za-z_\u0080-\u{10ffff}]+/ + RE_NON_PRINTABLE = /[\u0000-\u0008\u000b\u000e-\u001f\u007f]+/ + RE_NUMBER_DECIMAL = /\.[0-9]+/ + RE_NUMBER_EXPONENT = /[Ee][+-]?[0-9]+/ + RE_NUMBER_SIGN = /[+-]/ + + RE_NUMBER_STR = /\A + (?<sign> [+-]?) + (?<integer> [0-9]*) + (?:\. + (?<fractional> [0-9]*) + )? + (?:[Ee] + (?<exponent_sign> [+-]?) + (?<exponent> [0-9]*) + )? + \z/x + + RE_QUOTED_URL_START = /\A[\n\u0009\u0020]?["']/ + RE_UNICODE_RANGE_START = /\+(?:[0-9A-Fa-f]|\?)/ + RE_UNICODE_RANGE_END = /-[0-9A-Fa-f]/ + RE_WHITESPACE = /[\n\u0009\u0020]+/ + RE_WHITESPACE_ANCHORED = /\A[\n\u0009\u0020]+\z/ + + # -- Class Methods --------------------------------------------------------- + + # Tokenizes the given _input_ as a CSS string and returns an array of + # tokens. + # + # See {#initialize} for _options_. + def self.tokenize(input, options = {}) + Tokenizer.new(input, options).tokenize + end + + # -- Instance Methods ------------------------------------------------------ + + # Initializes a new Tokenizer. + # + # Options: + # + # * **:preserve_comments** - If `true`, comments will be preserved as + # `:comment` tokens. + # + # * **:preserve_hacks** - If `true`, certain non-standard browser hacks + # such as the IE "*" hack will be preserved even though they violate + # CSS 3 syntax rules. + # + def initialize(input, options = {}) + @s = Scanner.new(preprocess(input)) + @options = options + end + + # Consumes a token and returns the token that was consumed. + # + # 4.3.1. http://dev.w3.org/csswg/css-syntax/#consume-a-token + def consume + return nil if @s.eos? + + @s.mark + + # Consume comments. + if comment_token = consume_comments + if @options[:preserve_comments] + return comment_token + else + return consume + end + end + + # Consume whitespace. + return create_token(:whitespace) if @s.scan(RE_WHITESPACE) + + char = @s.consume + + case char.to_sym + when :'"' + consume_string + + when :'#' + if @s.peek =~ RE_NAME || valid_escape?(@s.peek(2)) + create_token(:hash, + :type => start_identifier?(@s.peek(3)) ? :id : :unrestricted, + :value => consume_name) + else + create_token(:delim, :value => char) + end + + when :'$' + if @s.peek == '=' + @s.consume + create_token(:suffix_match) + else + create_token(:delim, :value => char) + end + + when :"'" + consume_string + + when :'(' + create_token(:'(') + + when :')' + create_token(:')') + + when :* + if @s.peek == '=' + @s.consume + create_token(:substring_match) + + # Non-standard: Preserve the IE * hack. + elsif @options[:preserve_hacks] && @s.peek =~ RE_NAME_START + @s.reconsume + consume_ident + + else + create_token(:delim, :value => char) + end + + when :+ + if start_number? + @s.reconsume + consume_numeric + else + create_token(:delim, :value => char) + end + + when :',' + create_token(:comma) + + when :- + nextTwoChars = @s.peek(2) + nextThreeChars = char + nextTwoChars + + if start_number?(nextThreeChars) + @s.reconsume + consume_numeric + elsif nextTwoChars == '->' + @s.consume + @s.consume + create_token(:cdc) + elsif start_identifier?(nextThreeChars) + @s.reconsume + consume_ident + else + create_token(:delim, :value => char) + end + + when :'.' + if start_number? + @s.reconsume + consume_numeric + else + create_token(:delim, :value => char) + end + + when :':' + create_token(:colon) + + when :';' + create_token(:semicolon) + + when :< + if @s.peek(3) == '!--' + @s.consume + @s.consume + @s.consume + + create_token(:cdo) + else + create_token(:delim, :value => char) + end + + when :'@' + if start_identifier?(@s.peek(3)) + create_token(:at_keyword, :value => consume_name) + else + create_token(:delim, :value => char) + end + + when :'[' + create_token(:'[') + + when :'\\' + if valid_escape? + @s.reconsume + consume_ident + else + # Parse error. + create_token(:delim, + :error => true, + :value => char) + end + + when :']' + create_token(:']') + + when :'^' + if @s.peek == '=' + @s.consume + create_token(:prefix_match) + else + create_token(:delim, :value => char) + end + + when :'{' + create_token(:'{') + + when :'}' + create_token(:'}') + + when :U, :u + if @s.peek(2) =~ RE_UNICODE_RANGE_START + @s.consume + consume_unicode_range + else + @s.reconsume + consume_ident + end + + when :| + case @s.peek + when '=' + @s.consume + create_token(:dash_match) + + when '|' + @s.consume + create_token(:column) + + else + create_token(:delim, :value => char) + end + + when :~ + if @s.peek == '=' + @s.consume + create_token(:include_match) + else + create_token(:delim, :value => char) + end + + else + case char + when RE_DIGIT + @s.reconsume + consume_numeric + + when RE_NAME_START + @s.reconsume + consume_ident + + else + create_token(:delim, :value => char) + end + end + end + + # Consumes the remnants of a bad URL and returns the consumed text. + # + # 4.3.15. http://dev.w3.org/csswg/css-syntax/#consume-the-remnants-of-a-bad-url + def consume_bad_url + text = '' + + until @s.eos? + if valid_escape? + text << consume_escaped + elsif valid_escape?(@s.peek(2)) + @s.consume + text << consume_escaped + else + char = @s.consume + + if char == ')' + break + else + text << char + end + end + end + + text + end + + # Consumes comments and returns them, or `nil` if no comments were consumed. + # + # 4.3.2. http://dev.w3.org/csswg/css-syntax/#consume-comments + def consume_comments + if @s.peek(2) == '/*' + @s.consume + @s.consume + + if text = @s.scan_until(RE_COMMENT_CLOSE) + text.slice!(-2, 2) + else + # Parse error. + text = @s.consume_rest + end + + return create_token(:comment, :value => text) + end + + nil + end + + # Consumes an escaped code point and returns its unescaped value. + # + # This method assumes that the `\` has already been consumed, and that the + # next character in the input has already been verified not to be a newline + # or EOF. + # + # 4.3.8. http://dev.w3.org/csswg/css-syntax/#consume-an-escaped-code-point + def consume_escaped + return "\ufffd" if @s.eos? + + if hex_str = @s.scan(RE_HEX) + @s.consume if @s.peek =~ RE_WHITESPACE + + codepoint = hex_str.hex + + if codepoint == 0 || + codepoint.between?(0xD800, 0xDFFF) || + codepoint > 0x10FFFF + + return "\ufffd" + else + return codepoint.chr(Encoding::UTF_8) + end + end + + @s.consume + end + + # Consumes an ident-like token and returns it. + # + # 4.3.4. http://dev.w3.org/csswg/css-syntax/#consume-an-ident-like-token + def consume_ident + value = consume_name + + if @s.peek == '(' + @s.consume + + if value.downcase == 'url' + @s.consume while @s.peek(2) =~ RE_WHITESPACE_ANCHORED + + if @s.peek(2) =~ RE_QUOTED_URL_START + create_token(:function, :value => value) + else + consume_url + end + else + create_token(:function, :value => value) + end + else + create_token(:ident, :value => value) + end + end + + # Consumes a name and returns it. + # + # 4.3.12. http://dev.w3.org/csswg/css-syntax/#consume-a-name + def consume_name + result = '' + + until @s.eos? + if match = @s.scan(RE_NAME) + result << match + next + end + + char = @s.consume + + if valid_escape? + result << consume_escaped + + # Non-standard: IE * hack + elsif char == '*' && @options[:preserve_hacks] + result << @s.consume + + else + @s.reconsume + return result + end + end + + result + end + + # Consumes a number and returns a 3-element array containing the number's + # original representation, its numeric value, and its type (either + # `:integer` or `:number`). + # + # 4.3.13. http://dev.w3.org/csswg/css-syntax/#consume-a-number + def consume_number + repr = '' + type = :integer + + repr << @s.consume if @s.peek =~ RE_NUMBER_SIGN + repr << (@s.scan(RE_DIGIT) || '') + + if match = @s.scan(RE_NUMBER_DECIMAL) + repr << match + type = :number + end + + if match = @s.scan(RE_NUMBER_EXPONENT) + repr << match + type = :number + end + + [repr, convert_string_to_number(repr), type] + end + + # Consumes a numeric token and returns it. + # + # 4.3.3. http://dev.w3.org/csswg/css-syntax/#consume-a-numeric-token + def consume_numeric + number = consume_number + + if start_identifier?(@s.peek(3)) + create_token(:dimension, + :repr => number[0], + :type => number[2], + :unit => consume_name, + :value => number[1]) + + elsif @s.peek == '%' + @s.consume + + create_token(:percentage, + :repr => number[0], + :type => number[2], + :value => number[1]) + + else + create_token(:number, + :repr => number[0], + :type => number[2], + :value => number[1]) + end + end + + # Consumes a string token that ends at the given character, and returns the + # token. + # + # 4.3.5. http://dev.w3.org/csswg/css-syntax/#consume-a-string-token + def consume_string(ending = nil) + ending = @s.current if ending.nil? + value = '' + + until @s.eos? + case char = @s.consume + when ending + break + + when "\n" + # Parse error. + @s.reconsume + return create_token(:bad_string, + :error => true, + :value => value) + + when '\\' + case @s.peek + when '' + # End of the input, so do nothing. + next + + when "\n" + @s.consume + + else + value << consume_escaped + end + + else + value << char + end + end + + create_token(:string, :value => value) + end + + # Consumes a Unicode range token and returns it. Assumes the initial "u+" or + # "U+" has already been consumed. + # + # 4.3.7. http://dev.w3.org/csswg/css-syntax/#consume-a-unicode-range-token + def consume_unicode_range + value = @s.scan(RE_HEX) || '' + + while value.length < 6 + break unless @s.peek == '?' + value << @s.consume + end + + range = {} + + if value.include?('?') + range[:start] = value.gsub('?', '0').hex + range[:end] = value.gsub('?', 'F').hex + return create_token(:unicode_range, range) + end + + range[:start] = value.hex + + if @s.peek(2) =~ RE_UNICODE_RANGE_END + @s.consume + range[:end] = (@s.scan(RE_HEX) || '').hex + else + range[:end] = range[:start] + end + + create_token(:unicode_range, range) + end + + # Consumes a URL token and returns it. Assumes the original "url(" has + # already been consumed. + # + # 4.3.6. http://dev.w3.org/csswg/css-syntax/#consume-a-url-token + def consume_url + value = '' + + @s.scan(RE_WHITESPACE) + + until @s.eos? + case char = @s.consume + when ')' + break + + when RE_WHITESPACE + @s.scan(RE_WHITESPACE) + + if @s.eos? || @s.peek == ')' + @s.consume + break + else + return create_token(:bad_url, :value => value + consume_bad_url) + end + + when '"', "'", '(', RE_NON_PRINTABLE + # Parse error. + return create_token(:bad_url, + :error => true, + :value => value + consume_bad_url) + + when '\\' + if valid_escape? + value << consume_escaped + else + # Parse error. + return create_token(:bad_url, + :error => true, + :value => value + consume_bad_url + ) + end + + else + value << char + end + end + + create_token(:url, :value => value) + end + + # Converts a valid CSS number string into a number and returns the number. + # + # 4.3.14. http://dev.w3.org/csswg/css-syntax/#convert-a-string-to-a-number + def convert_string_to_number(str) + matches = RE_NUMBER_STR.match(str) + + s = matches[:sign] == '-' ? -1 : 1 + i = matches[:integer].to_i + f = matches[:fractional].to_i + d = matches[:fractional] ? matches[:fractional].length : 0 + t = matches[:exponent_sign] == '-' ? -1 : 1 + e = matches[:exponent].to_i + + # I know this looks nutty, but it's exactly what's defined in the spec, + # and it works. + s * (i + f * 10**-d) * 10**(t * e) + end + + # Creates and returns a new token with the given _properties_. + def create_token(type, properties = {}) + { + :node => type, + :pos => @s.marker, + :raw => @s.marked + }.merge!(properties) + end + + # Preprocesses _input_ to prepare it for the tokenizer. + # + # 3.3. http://dev.w3.org/csswg/css-syntax/#input-preprocessing + def preprocess(input) + input = input.to_s.encode('UTF-8', + :invalid => :replace, + :undef => :replace) + + input.gsub!(/(?:\r\n|[\r\f])/, "\n") + input.gsub!("\u0000", "\ufffd") + input + end + + # Returns `true` if the given three-character _text_ would start an + # identifier. If _text_ is `nil`, the current and next two characters in the + # input stream will be checked, but will not be consumed. + # + # 4.3.10. http://dev.w3.org/csswg/css-syntax/#would-start-an-identifier + def start_identifier?(text = nil) + text = @s.current + @s.peek(2) if text.nil? + + case text[0] + when '-' + nextChar = text[1] + !!(nextChar == '-' || nextChar =~ RE_NAME_START || valid_escape?(text[1, 2])) + + when RE_NAME_START + true + + when '\\' + valid_escape?(text[0, 2]) + + else + false + end + end + + # Returns `true` if the given three-character _text_ would start a number. + # If _text_ is `nil`, the current and next two characters in the input + # stream will be checked, but will not be consumed. + # + # 4.3.11. http://dev.w3.org/csswg/css-syntax/#starts-with-a-number + def start_number?(text = nil) + text = @s.current + @s.peek(2) if text.nil? + + case text[0] + when '+', '-' + !!(text[1] =~ RE_DIGIT || (text[1] == '.' && text[2] =~ RE_DIGIT)) + + when '.' + !!(text[1] =~ RE_DIGIT) + + when RE_DIGIT + true + + else + false + end + end + + # Tokenizes the input stream and returns an array of tokens. + def tokenize + @s.reset + + tokens = [] + + while token = consume + tokens << token + end + + tokens + end + + # Returns `true` if the given two-character _text_ is the beginning of a + # valid escape sequence. If _text_ is `nil`, the current and next character + # in the input stream will be checked, but will not be consumed. + # + # 4.3.9. http://dev.w3.org/csswg/css-syntax/#starts-with-a-valid-escape + def valid_escape?(text = nil) + text = @s.current + @s.peek if text.nil? + !!(text[0] == '\\' && text[1] != "\n") + end + end + +end diff --color -rubN rails-html-sanitizer-1.0.4-ori-2/lib/crass/token-scanner.rb rails-html-sanitizer-1.0.4/lib/crass/token-scanner.rb --- rails-html-sanitizer-1.0.4-ori-2/lib/crass/token-scanner.rb 1970-01-01 01:00:00.000000000 +0100 +++ rails-html-sanitizer-1.0.4/lib/crass/token-scanner.rb 2015-04-18 06:16:46.000000000 +0200 @@ -0,0 +1,50 @@ +# encoding: utf-8 + +module Crass + + # Like {Scanner}, but for tokens! + class TokenScanner + attr_reader :current, :pos, :tokens + + def initialize(tokens) + @tokens = tokens.to_a + reset + end + + # Executes the given block, collects all tokens that are consumed during its + # execution, and returns them. + def collect + start = @pos + yield + @tokens[start...@pos] || [] + end + + # Consumes the next token and returns it, advancing the pointer. Returns + # `nil` if there is no next token. + def consume + @current = @tokens[@pos] + @pos += 1 if @current + @current + end + + # Returns the next token without consuming it, or `nil` if there is no next + # token. + def peek + @tokens[@pos] + end + + # Reconsumes the current token, moving the pointer back one position. + # + # http://www.w3.org/TR/2013/WD-css-syntax-3-20130919/#reconsume-the-current-input-token + def reconsume + @pos -= 1 if @pos > 0 + end + + # Resets the pointer to the first token in the list. + def reset + @current = nil + @pos = 0 + end + end + +end diff --color -rubN rails-html-sanitizer-1.0.4-ori-2/lib/crass/version.rb rails-html-sanitizer-1.0.4/lib/crass/version.rb --- rails-html-sanitizer-1.0.4-ori-2/lib/crass/version.rb 1970-01-01 01:00:00.000000000 +0100 +++ rails-html-sanitizer-1.0.4/lib/crass/version.rb 2015-04-18 06:16:46.000000000 +0200 @@ -0,0 +1,5 @@ +# encoding: utf-8 + +module Crass + VERSION = '1.0.2' +end diff --color -rubN rails-html-sanitizer-1.0.4-ori-2/lib/crass.rb rails-html-sanitizer-1.0.4/lib/crass.rb --- rails-html-sanitizer-1.0.4-ori-2/lib/crass.rb 1970-01-01 01:00:00.000000000 +0100 +++ rails-html-sanitizer-1.0.4/lib/crass.rb 2023-08-29 17:08:37.372205396 +0200 @@ -0,0 +1,22 @@ +# encoding: utf-8 +require_relative 'crass/parser' + +# A CSS parser based on the CSS Syntax Module Level 3 spec. +module Crass + + # Parses _input_ as a CSS stylesheet and returns a parse tree. + # + # See {Tokenizer#initialize} for _options_. + def self.parse(input, options = {}) + Parser.parse_stylesheet(input, options) + end + + # Parses _input_ as a string of CSS properties (such as the contents of an + # HTML element's `style` attribute) and returns a parse tree. + # + # See {Tokenizer#initialize} for _options_. + def self.parse_properties(input, options = {}) + Parser.parse_properties(input, options) + end + +end diff --color -rubN rails-html-sanitizer-1.0.4-ori-2/lib/loofah/html5/scrub.rb rails-html-sanitizer-1.0.4/lib/loofah/html5/scrub.rb --- rails-html-sanitizer-1.0.4-ori-2/lib/loofah/html5/scrub.rb 1970-01-01 01:00:00.000000000 +0100 +++ rails-html-sanitizer-1.0.4/lib/loofah/html5/scrub.rb 2023-08-29 12:50:26.371689045 +0200 @@ -0,0 +1,26 @@ +require "crass" + +module Loofah + module HTML5 + module Scrub + def scrub_attribute_that_allows_local_ref(attr_node) + return unless attr_node.value + + nodes = Crass::Parser.new(attr_node.value).parse_component_values + + values = nodes.map do |node| + case node[:node] + when :url + if node[:value].start_with?("#") + node[:raw] + end + when :hash, :ident, :string + node[:raw] + end + end.compact + + attr_node.value = values.join(" ") + end + end + end +end diff --color -rubN rails-html-sanitizer-1.0.4-ori-2/lib/rails/html/scrubbers.rb rails-html-sanitizer-1.0.4/lib/rails/html/scrubbers.rb --- rails-html-sanitizer-1.0.4-ori-2/lib/rails/html/scrubbers.rb 2023-08-29 17:06:35.524475915 +0200 +++ rails-html-sanitizer-1.0.4/lib/rails/html/scrubbers.rb 2023-08-29 17:38:20.694579554 +0200 @@ -61,9 +61,9 @@ end def scrub(node) - if node.cdata? - text = node.document.create_text_node node.text - node.replace text + if Loofah::HTML5::Scrub.cdata_needs_escaping?(node) + replacement = Loofah::HTML5::Scrub.cdata_escape(node) + node.replace(replacement) return CONTINUE end return CONTINUE if skip_node?(node) @@ -139,15 +139,13 @@ end if Loofah::HTML5::WhiteList::ATTR_VAL_IS_URI.include?(attr_name) - # this block lifted nearly verbatim from HTML5 sanitization - val_unescaped = CGI.unescapeHTML(attr_node.value).gsub(Loofah::HTML5::Scrub::CONTROL_CHARACTERS,'').downcase - if val_unescaped =~ /^[a-z0-9][-+.a-z0-9]*:/ && ! Loofah::HTML5::WhiteList::ALLOWED_PROTOCOLS.include?(val_unescaped.split(Loofah::HTML5::WhiteList::PROTOCOL_SEPARATOR)[0]) - attr_node.remove - end + return if Loofah::HTML5::Scrub.scrub_uri_attribute(attr_node) end + if Loofah::HTML5::WhiteList::SVG_ATTR_VAL_ALLOWS_REF.include?(attr_name) - attr_node.value = attr_node.value.gsub(/url\s*\(\s*[^#\s][^)]+?\)/m, ' ') if attr_node.value + Loofah::HTML5::Scrub.scrub_attribute_that_allows_local_ref(attr_node) end + if Loofah::HTML5::WhiteList::SVG_ALLOW_LOCAL_HREF.include?(node.name) && attr_name == 'xlink:href' && attr_node.value =~ /^\s*[^#\s].*/m attr_node.remove end diff --color -rubN rails-html-sanitizer-1.0.4-ori-2/test/sanitizer_test.rb rails-html-sanitizer-1.0.4/test/sanitizer_test.rb --- rails-html-sanitizer-1.0.4-ori-2/test/sanitizer_test.rb 2023-08-29 17:06:35.524475915 +0200 +++ rails-html-sanitizer-1.0.4/test/sanitizer_test.rb 2023-08-29 18:03:03.120733708 +0200 @@ -54,7 +54,8 @@ def test_strip_tags_with_quote input = '<" <img src="trollface.gif" onload="alert(1)"> hi' - assert_equal ' hi', full_sanitize(input) + expected = libxml_2_9_14_recovery_lt? ? %{<" hi} : %{ hi} + assert_equal(expected, full_sanitize(input)) end def test_strip_invalid_html @@ -75,15 +76,21 @@ end def test_remove_unclosed_tags - assert_equal "This is ", full_sanitize("This is <-- not\n a comment here.") + input = "This is <-- not\n a comment here." + expected = libxml_2_9_14_recovery_lt? ? %{This is <-- not\n a comment here.} : %{This is } + assert_equal(expected, full_sanitize(input)) end def test_strip_cdata - assert_equal "This has a ]]> here.", full_sanitize("This has a <![CDATA[<section>]]> here.") + input = "This has a <![CDATA[<section>]]> here." + expected = libxml_2_9_14_recovery_lt_bang? ? %{This has a <![CDATA[]]> here.} : %{This has a ]]> here.} + assert_equal(expected, full_sanitize(input)) end def test_strip_unclosed_cdata - assert_equal "This has an unclosed ]] here...", full_sanitize("This has an unclosed <![CDATA[<section>]] here...") + input = "<![CDATA[<span>section</span>]]>" + expected = libxml_2_9_14_recovery_lt_bang? ? %{<![CDATA[<span>section</span>]]>} : %{section]]>} + assert_sanitized(input, expected) end def test_strip_blank_string @@ -440,7 +447,9 @@ end def test_should_sanitize_unterminated_cdata_section - assert_sanitized "<![CDATA[<span>neverending...", "neverending..." + input = "<![CDATA[<span>neverending..." + expected = libxml_2_9_14_recovery_lt_bang? ? %{<![CDATA[<span>neverending...</span>} : %{neverending...} + assert_sanitized(input, expected) end def test_should_not_mangle_urls_with_ampersand @@ -516,7 +525,125 @@ assert_equal %{<a action="examp<!--%22%20unsafeattr=foo()>-->le.com">test</a>}, text end -protected + %w[text/plain text/css image/png image/gif image/jpeg].each do |mediatype| + define_method "test_mediatype_#{mediatype}_allowed" do + input = %Q(<img src="data:#{mediatype};base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4=">) + expected = input + actual = safe_list_sanitize(input) + assert_equal(expected, actual) + input = %Q(<img src="DATA:#{mediatype};base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4=">) + expected = input + actual = safe_list_sanitize(input) + assert_equal(expected, actual) + end + end + + def test_mediatype_text_html_disallowed + input = %q(<img src="data:text/html;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4=">) + expected = %q(<img>) + actual = safe_list_sanitize(input) + assert_equal(expected, actual) + + input = %q(<img src="DATA:text/html;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4=">) + expected = %q(<img>) + actual = safe_list_sanitize(input) + assert_equal(expected, actual) + end + + def test_mediatype_image_svg_xml_disallowed + input = %q(<img src="data:image/svg+xml;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4=">) + expected = %q(<img>) + actual = safe_list_sanitize(input) + assert_equal(expected, actual) + + input = %q(<img src="DATA:image/svg+xml;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4=">) + expected = %q(<img>) + actual = safe_list_sanitize(input) + assert_equal(expected, actual) + end + + def test_mediatype_other_disallowed + input = %q(<a href="data:foo;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4=">foo</a>) + expected = %q(<a>foo</a>) + actual = safe_list_sanitize(input) + assert_equal(expected, actual) + + input = %q(<a href="DATA:foo;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4=">foo</a>) + expected = %q(<a>foo</a>) + actual = safe_list_sanitize(input) + assert_equal(expected, actual) + end + + def test_scrubbing_svg_attr_values_that_allow_ref + input = %Q(<div fill="yellow url(http://bad.com/) #fff">hey</div>) + expected = %Q(<div fill="yellow #fff">hey</div>) + actual = scope_allowed_attributes %w(fill) do + safe_list_sanitize(input) + end + + assert_equal(expected, actual) + end + + def test_style_with_css_payload + input, tags = "<style>div > span { background: \"red\"; }</style>", ["style"] + expected = "<style>div > span { background: \"red\"; }</style>" + actual = safe_list_sanitize(input, tags: tags) + + assert_equal(expected, actual) + end + + def test_combination_of_select_and_style_with_css_payload + input, tags = "<select><style>div > span { background: \"red\"; }</style></select>", ["select", "style"] + expected = "<select><style>div > span { background: \"red\"; }</style></select>" + actual = safe_list_sanitize(input, tags: tags) + + assert_equal(expected, actual) + end + + def test_combination_of_select_and_style_with_script_payload + input, tags = "<select><style><script>alert(1)</script></style></select>", ["select", "style"] + expected = "<select><style><script>alert(1)</script></style></select>" + actual = safe_list_sanitize(input, tags: tags) + + assert_equal(expected, actual) + end + + def test_combination_of_svg_and_style_with_script_payload + input, tags = "<svg><style><script>alert(1)</script></style></svg>", ["svg", "style"] + expected = "<svg><style><script>alert(1)</script></style></svg>" + actual = safe_list_sanitize(input, tags: tags) + + assert_equal(expected, actual) + end + + def test_combination_of_math_and_style_with_img_payload + input, tags = "<math><style><img src=x onerror=alert(1)></style></math>", ["math", "style"] + expected = "<math><style><img src=x onerror=alert(1)></style></math>" + actual = safe_list_sanitize(input, tags: tags) + + assert_equal(expected, actual) + + input, tags = "<math><style><img src=x onerror=alert(1)></style></math>", ["math", "style", "img"] + expected = "<math><style><img src=x onerror=alert(1)></style></math>" + actual = safe_list_sanitize(input, tags: tags) + + assert_equal(expected, actual) + end + + def test_combination_of_svg_and_style_with_img_payload + input, tags = "<svg><style><img src=x onerror=alert(1)></style></svg>", ["svg", "style"] + expected = "<svg><style><img src=x onerror=alert(1)></style></svg>" + actual = safe_list_sanitize(input, tags: tags) + + assert_equal(expected, actual) + + input, tags = "<svg><style><img src=x onerror=alert(1)></style></svg>", ["svg", "style", "img"] + expected = "<svg><style><img src=x onerror=alert(1)></style></svg>" + actual = safe_list_sanitize(input, tags: tags) + + assert_equal(expected, actual) + end + protected def xpath_sanitize(input, options = {}) XpathRemovalTestSanitizer.new.sanitize(input, options) @@ -561,4 +688,14 @@ ensure Rails::Html::WhiteListSanitizer.allowed_attributes = old_attributes end + + def libxml_2_9_14_recovery_lt? + # changed in 2.9.14, see https://github.com/sparklemotion/nokogiri/releases/tag/v1.13.5 + Nokogiri.method(:uses_libxml?).arity == -1 && Nokogiri.uses_libxml?(">= 2.9.14") + end + def libxml_2_9_14_recovery_lt_bang? + # changed in 2.9.14, see https://github.com/sparklemotion/nokogiri/releases/tag/v1.13.5 + # then reverted in 2.10.0, see https://gitlab.gnome.org/GNOME/libxml2/-/issues/380 + Nokogiri.method(:uses_libxml?).arity == -1 && Nokogiri.uses_libxml?("= 2.9.14") + end end
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