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Secure #sanitize, #strip_tags, and #strip_links helpers against xss a…

…ttacks. Closes #8877. [Rick, lifofifo, Jacques Distler]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7589 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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commit 2d02199e1581db8dc84361803950b1697f493fc0 1 parent 4965b1b
@technoweenie technoweenie authored
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5 actionpack/CHANGELOG
@@ -1,5 +1,10 @@
*SVN*
+* Secure #sanitize, #strip_tags, and #strip_links helpers against xss attacks. Closes #8877. [Rick, lifofifo, Jacques Distler]
+
+ This merges and renames the popular white_list helper (along with some css sanitizing from Jacques Distler version of the same plugin).
+ Also applied updated versions of #strip_tags and #strip_links from #8877.
+
* Remove use of & logic operator. Closes #8114. [watson]
* Fixed JavaScriptHelper#escape_javascript to also escape closing tags #8023 [rubyruy]
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129 actionpack/lib/action_view/base.rb
@@ -198,6 +198,135 @@ class Base
@@erb_variable = '_erbout'
cattr_accessor :erb_variable
+
+ # A regular expression of the valid characters used to separate protocols like
+ # the ':' in 'http://foo.com'
+ @@sanitized_protocol_separator = /:|(&#0*58)|(&#x70)|(%|%)3A/
+ cattr_accessor :sanitized_protocol_separator
+
+ # Specifies a Set of HTML attributes that can have URIs.
+ @@sanitized_uri_attributes = Set.new(%w(href src cite action longdesc xlink:href lowsrc))
+ cattr_reader :sanitized_uri_attributes
+
+ # Adds valid HTML attributes that the #sanitize helper checks for URIs.
+ #
+ # Rails::Initializer.run do |config|
+ # config.action_view.sanitized_uri_attributes = 'lowsrc', 'target'
+ # end
+ #
+ def self.sanitized_uri_attributes=(attributes)
+ @@sanitized_uri_attributes.merge(attributes)
+ end
+
+ # Specifies a Set of 'bad' tags that the #sanitize helper will remove completely, as opposed
+ # to just escaping harmless tags like <font>
+ @@sanitized_bad_tags = Set.new('script')
+ cattr_reader :sanitized_bad_tags
+
+ # Adds to the Set of 'bad' tags for the #sanitize helper.
+ #
+ # Rails::Initializer.run do |config|
+ # config.action_view.sanitized_bad_tags = 'embed', 'object'
+ # end
+ #
+ def self.sanitized_bad_tags=(attributes)
+ @@sanitized_bad_tags.merge(attributes)
+ end
+
+ # Specifies the default Set of tags that the #sanitize helper will allow unscathed.
+ @@sanitized_allowed_tags = Set.new(%w(strong em b i p code pre tt output samp kbd var sub
+ sup dfn cite big small address hr br div span h1 h2 h3 h4 h5 h6 ul ol li dt dd abbr
+ acronym a img blockquote del ins fieldset legend))
+ cattr_reader :sanitized_allowed_tags
+
+ # Adds to the Set of allowed tags for the #sanitize helper.
+ #
+ # Rails::Initializer.run do |config|
+ # config.action_view.sanitized_allowed_tags = 'table', 'tr', 'td'
+ # end
+ #
+ def self.sanitized_allowed_tags=(attributes)
+ @@sanitized_allowed_tags.merge(attributes)
+ end
+
+ # Specifies the default Set of html attributes that the #sanitize helper will leave
+ # in the allowed tag.
+ @@sanitized_allowed_attributes = Set.new(%w(href src width height alt cite datetime title class name xml:lang abbr))
+ cattr_reader :sanitized_allowed_attributes
+
+ # Adds to the Set of allowed html attributes for the #sanitize helper.
+ #
+ # Rails::Initializer.run do |config|
+ # config.action_view.sanitized_allowed_attributes = 'onclick', 'longdesc'
+ # end
+ #
+ def self.sanitized_allowed_attributes=(attributes)
+ @@sanitized_allowed_attributes.merge(attributes)
+ end
+
+ # Specifies the default Set of acceptable css properties that #sanitize and #sanitize_css will accept.
+ @@sanitized_allowed_css_properties = Set.new(%w(azimuth background-color border-bottom-color border-collapse
+ border-color border-left-color border-right-color border-top-color clear color cursor direction display
+ elevation float font font-family font-size font-style font-variant font-weight height letter-spacing line-height
+ overflow pause pause-after pause-before pitch pitch-range richness speak speak-header speak-numeral speak-punctuation
+ speech-rate stress text-align text-decoration text-indent unicode-bidi vertical-align voice-family volume white-space
+ width))
+ cattr_reader :sanitized_allowed_css_properties
+
+ # Adds to the Set of allowed css properties for the #sanitize and #sanitize_css heleprs.
+ #
+ # Rails::Initializer.run do |config|
+ # config.action_view.sanitized_allowed_css_properties = 'expression'
+ # end
+ #
+ def self.sanitized_allowed_css_properties=(attributes)
+ @@sanitized_allowed_css_properties.merge(attributes)
+ end
+
+ # Specifies the default Set of acceptable css keywords that #sanitize and #sanitize_css will accept.
+ @@sanitized_allowed_css_keywords = Set.new(%w(auto aqua black block blue bold both bottom brown center
+ collapse dashed dotted fuchsia gray green !important italic left lime maroon medium none navy normal
+ nowrap olive pointer purple red right solid silver teal top transparent underline white yellow))
+ cattr_reader :sanitized_allowed_css_keywords
+
+ # Adds to the Set of allowed css keywords for the #sanitize and #sanitize_css helpers.
+ #
+ # Rails::Initializer.run do |config|
+ # config.action_view.sanitized_allowed_css_keywords = 'expression'
+ # end
+ #
+ def self.sanitized_allowed_css_keywords=(attributes)
+ @@sanitized_allowed_css_keywords.merge(attributes)
+ end
+
+ # Specifies the default Set of allowed shorthand css properties for the #sanitize and #sanitize_css helpers.
+ @@sanitized_shorthand_css_properties = Set.new(%w(background border margin padding))
+ cattr_reader :sanitized_shorthand_css_properties
+
+ # Adds to the Set of allowed shorthand css properties for the #sanitize and #sanitize_css helpers.
+ #
+ # Rails::Initializer.run do |config|
+ # config.action_view.sanitized_shorthand_css_properties = 'expression'
+ # end
+ #
+ def self.sanitized_shorthand_css_properties=(attributes)
+ @@sanitized_shorthand_css_properties.merge(attributes)
+ end
+
+ # Specifies the default Set of protocols that the #sanitize helper will leave in
+ # protocol attributes.
+ @@sanitized_allowed_protocols = Set.new(%w(ed2k ftp http https irc mailto news gopher nntp telnet webcal xmpp callto feed svn urn aim rsync tag ssh sftp rtsp afs))
+ cattr_reader :sanitized_allowed_protocols
+
+ # Adds to the Set of allowed protocols for the #sanitize helper.
+ #
+ # Rails::Initializer.run do |config|
+ # config.action_view.sanitized_allowed_protocols = 'ssh', 'feed'
+ # end
+ #
+ def self.sanitized_allowed_protocols=(attributes)
+ @@sanitized_allowed_protocols.merge(attributes)
+ end
@@template_handlers = HashWithIndifferentAccess.new
View
136 actionpack/lib/action_view/helpers/text_helper.rb
@@ -324,63 +324,118 @@ def auto_link(text, link = :all, href_options = {}, &block)
#
# strip_links('Blog: <a href="http://www.myblog.com/" class="nav" target=\"_blank\">Visit</a>.')
# # => Blog: Visit
- def strip_links(text)
- text.gsub(/<a\b.*?>(.*?)<\/a>/mi, '\1')
+ def strip_links(html)
+ # Stupid firefox treats '<href="http://whatever.com" onClick="alert()">something' as link!
+ if html.index("<a") || html.index("<href")
+ tokenizer = HTML::Tokenizer.new(html)
+ result = ''
+ while token = tokenizer.next
+ node = HTML::Node.parse(nil, 0, 0, token, false)
+ result << node.to_s unless node.is_a?(HTML::Tag) && ["a", "href"].include?(node.name)
+ end
+ strip_links(result) # Recurse - handle all dirty nested links
+ else
+ html
+ end
end
- VERBOTEN_TAGS = %w(form script plaintext) unless defined?(VERBOTEN_TAGS)
- VERBOTEN_ATTRS = /^on/i unless defined?(VERBOTEN_ATTRS)
-
- # Sanitizes the +html+ by converting <form> and <script> tags into regular
- # text, and removing all "on*" (e.g., onClick) attributes so that arbitrary Javascript
- # cannot be executed. It also removes <tt>href</tt> and <tt>src</tt> attributes that start with
- # "javascript:". You can modify what gets sanitized by defining VERBOTEN_TAGS
- # and VERBOTEN_ATTRS before this Module is loaded.
+ # This #sanitize helper will html encode all tags and strip all attributes that aren't specifically allowed.
+ # It also strips href/src tags with invalid protocols, like javascript: especially. It does its best to counter any
+ # tricks that hackers may use, like throwing in unicode/ascii/hex values to get past the javascript: filters. Check out
+ # the extensive test suite.
#
- # ==== Examples
- # sanitize('<script> do_nasty_stuff() </script>')
- # # => &lt;script> do_nasty_stuff() &lt;/script>
+ # <%= sanitize @article.body %>
+ #
+ # You can add or remove tags/attributes if you want to customize it a bit. See ActionView::Base for full docs on the
+ # available options. You can add tags/attributes for single uses of #sanitize by passing either the :attributes or :tags options:
#
- # sanitize('<a href="javascript: sucker();">Click here for $100</a>')
- # # => <a>Click here for $100</a>
+ # Normal Use
#
- # sanitize('<a href="#" onClick="kill_all_humans();">Click here!!!</a>')
- # # => <a href="#">Click here!!!</a>
+ # <%= sanitize @article.body %>
#
- # sanitize('<img src="javascript:suckers_run_this();" />')
- # # => <img />
- def sanitize(html)
- # only do this if absolutely necessary
- if html.index("<")
+ # Custom Use
+ #
+ # <%= sanitize @article.body, :tags => %w(table tr td), :attributes => %w(id class style)
+ #
+ # Add table tags
+ #
+ # Rails::Initializer.run do |config|
+ # config.action_view.sanitized_allowed_tags = 'table', 'tr', 'td'
+ # end
+ #
+ # Remove tags
+ #
+ # Rails::Initializer.run do |config|
+ # config.after_initialize do
+ # ActionView::Base.sanitized_allowed_tags.delete 'div'
+ # end
+ # end
+ #
+ # Change allowed attributes
+ #
+ # Rails::Initializer.run do |config|
+ # config.action_view.sanitized_allowed_attributes = 'id', 'class', 'style'
+ # end
+ #
+ def sanitize(html, options = {})
+ return html if html.blank? || !html.include?('<')
+ attrs = options.key?(:attributes) ? Set.new(options[:attributes]).merge(sanitized_allowed_attributes) : sanitized_allowed_attributes
+ tags = options.key?(:tags) ? Set.new(options[:tags] ).merge(sanitized_allowed_tags) : sanitized_allowed_tags
+ returning [] do |new_text|
tokenizer = HTML::Tokenizer.new(html)
- new_text = ""
-
+ parent = []
while token = tokenizer.next
node = HTML::Node.parse(nil, 0, 0, token, false)
new_text << case node
when HTML::Tag
- if VERBOTEN_TAGS.include?(node.name)
- node.to_s.gsub(/</, "&lt;")
+ if node.closing == :close
+ parent.shift
else
- if node.closing != :close
- node.attributes.delete_if { |attr,v| attr =~ VERBOTEN_ATTRS }
- %w(href src).each do |attr|
- node.attributes.delete attr if node.attributes[attr] =~ /^javascript:/i
- end
- end
- node.to_s
+ parent.unshift node.name
end
+ node.attributes.keys.each do |attr_name|
+ value = node.attributes[attr_name].to_s
+ if !attrs.include?(attr_name) || contains_bad_protocols?(attr_name, value)
+ node.attributes.delete(attr_name)
+ else
+ node.attributes[attr_name] = attr_name == 'style' ? sanitize_css(value) : CGI::escapeHTML(value)
+ end
+ end if node.attributes
+ tags.include?(node.name) ? node : nil
else
- node.to_s.gsub(/</, "&lt;")
+ sanitized_bad_tags.include?(parent.first) ? nil : node.to_s.gsub(/</, "&lt;")
end
end
+ end.join
+ end
- html = new_text
+ # Sanitizes a block of css code. Used by #sanitize when it comes across a style attribute
+ def sanitize_css(style)
+ # disallow urls
+ style = style.to_s.gsub(/url\s*\(\s*[^\s)]+?\s*\)\s*/, ' ')
+
+ # gauntlet
+ if style !~ /^([:,;#%.\sa-zA-Z0-9!]|\w-\w|\'[\s\w]+\'|\"[\s\w]+\"|\([\d,\s]+\))*$/ ||
+ style !~ /^(\s*[-\w]+\s*:\s*[^:;]*(;|$))*$/
+ return ''
end
- html
+ returning [] do |clean|
+ style.scan(/([-\w]+)\s*:\s*([^:;]*)/) do |prop,val|
+ if sanitized_allowed_css_properties.include?(prop.downcase)
+ clean << prop + ': ' + val + ';'
+ elsif sanitized_shorthand_css_properties.include?(prop.split('-')[0].downcase)
+ unless val.split().any? do |keyword|
+ !sanitized_allowed_css_keywords.include?(keyword) &&
+ keyword !~ /^(#[0-9a-f]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|\d{0,2}\.?\d{0,2}(cm|em|ex|in|mm|pc|pt|px|%|,|\))?)$/
+ end
+ clean << prop + ': ' + val + ';'
+ end
+ end
+ end
+ end.join(' ')
end
-
+
# Strips all HTML tags from the +html+, including comments. This uses the
# html-scanner tokenizer and so its HTML parsing ability is limited by
# that of html-scanner.
@@ -407,7 +462,7 @@ def strip_tags(html)
end
# strip any comments, and if they have a newline at the end (ie. line with
# only a comment) strip that too
- text.gsub(/<!--(.*?)-->[\n]?/m, "")
+ strip_tags(text.gsub(/<!--(.*?)-->[\n]?/m, "")) # Recurse - handle all dirty nested tags
else
html # already plain text
end
@@ -574,6 +629,11 @@ def auto_link_email_addresses(text)
end
end
end
+
+ def contains_bad_protocols?(attr_name, value)
+ sanitized_uri_attributes.include?(attr_name) &&
+ (value =~ /(^[^\/:]*):|(&#0*58)|(&#x70)|(%|&#37;)3A/ && !sanitized_allowed_protocols.include?(value.split(sanitized_protocol_separator).first))
+ end
end
end
end
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206 actionpack/test/template/text_helper_test.rb
@@ -5,7 +5,7 @@ class TextHelperTest < Test::Unit::TestCase
include ActionView::Helpers::TextHelper
include ActionView::Helpers::TagHelper
include TestingSandbox
-
+
def setup
# This simulates the fact that instance variables are reset every time
# a view is rendered. The cycle helper depends on this behavior.
@@ -47,7 +47,13 @@ def test_truncate_multibyte
end
def test_strip_links
+ assert_equal "Dont touch me", strip_links("Dont touch me")
assert_equal "on my mind\nall day long", strip_links("<a href='almost'>on my mind</a>\n<A href='almost'>all day long</A>")
+ assert_equal "0wn3d", strip_links("<a href='http://www.rubyonrails.com/'><a href='http://www.rubyonrails.com/' onlclick='steal()'>0wn3d</a></a>")
+ assert_equal "Magic", strip_links("<a href='http://www.rubyonrails.com/'>Mag<a href='http://www.ruby-lang.org/'>ic")
+ assert_equal "FrrFox", strip_links("<href onlclick='steal()'>FrrFox</a></href>")
+ assert_equal "My mind\nall <b>day</b> long", strip_links("<a href='almost'>My mind</a>\n<A href='almost'>all <b>day</b> long</A>")
+ assert_equal "all <b>day</b> long", strip_links("<<a>a href='hello'>all <b>day</b> long<</A>/a>")
end
def test_highlighter
@@ -255,41 +261,198 @@ def test_auto_link_with_block
end
def test_sanitize_form
- raw = "<form action=\"/foo/bar\" method=\"post\"><input></form>"
- result = sanitize(raw)
- assert_equal %(&lt;form action="/foo/bar" method="post"><input>&lt;/form>), result
+ assert_sanitized "<form action=\"/foo/bar\" method=\"post\"><input></form>", ''
end
def test_sanitize_plaintext
raw = "<plaintext><span>foo</span></plaintext>"
- result = sanitize(raw)
- assert_equal "&lt;plaintext><span>foo</span>&lt;/plaintext>", result
+ assert_sanitized raw, "<span>foo</span>"
end
def test_sanitize_script
- raw = "<script language=\"Javascript\">blah blah blah</script>"
- result = sanitize(raw)
- assert_equal %{&lt;script language="Javascript">blah blah blah&lt;/script>}, result
+ raw = "a b c<script language=\"Javascript\">blah blah blah</script>d e f"
+ assert_sanitized raw, "a b cd e f"
end
def test_sanitize_js_handlers
raw = %{onthis="do that" <a href="#" onclick="hello" name="foo" onbogus="remove me">hello</a>}
- result = sanitize(raw)
- assert_equal %{onthis="do that" <a name="foo" href="#">hello</a>}, result
+ assert_sanitized raw, %{onthis="do that" <a name="foo" href="#">hello</a>}
end
def test_sanitize_javascript_href
raw = %{href="javascript:bang" <a href="javascript:bang" name="hello">foo</a>, <span href="javascript:bang">bar</span>}
- result = sanitize(raw)
- assert_equal %{href="javascript:bang" <a name="hello">foo</a>, <span>bar</span>}, result
+ assert_sanitized raw, %{href="javascript:bang" <a name="hello">foo</a>, <span>bar</span>}
end
def test_sanitize_image_src
raw = %{src="javascript:bang" <img src="javascript:bang" width="5">foo</img>, <span src="javascript:bang">bar</span>}
- result = sanitize(raw)
- assert_equal %{src="javascript:bang" <img width="5">foo</img>, <span>bar</span>}, result
+ assert_sanitized raw, %{src="javascript:bang" <img width="5">foo</img>, <span>bar</span>}
+ end
+
+ ActionView::Base.sanitized_allowed_tags.each do |tag_name|
+ define_method "test_should_allow_#{tag_name}_tag" do
+ assert_sanitized "start <#{tag_name} title=\"1\" onclick=\"foo\">foo <bad>bar</bad> baz</#{tag_name}> end", %(start <#{tag_name} title="1">foo bar baz</#{tag_name}> end)
+ end
+ end
+
+ def test_should_allow_anchors
+ assert_sanitized %(<a href="foo" onclick="bar"><script>baz</script></a>), %(<a href="foo"></a>)
+ end
+
+ # RFC 3986, sec 4.2
+ def test_allow_colons_in_path_component
+ assert_sanitized("<a href=\"./this:that\">foo</a>")
+ end
+
+ %w(src width height alt).each do |img_attr|
+ define_method "test_should_allow_image_#{img_attr}_attribute" do
+ assert_sanitized %(<img #{img_attr}="foo" onclick="bar" />), %(<img #{img_attr}="foo" />)
+ end
+ end
+
+ def test_should_handle_non_html
+ assert_sanitized 'abc'
+ end
+
+ def test_should_handle_blank_text
+ assert_sanitized nil
+ assert_sanitized ''
+ end
+
+ def test_should_allow_custom_tags
+ text = "<u>foo</u>"
+ assert_equal(text, sanitize(text, :tags => %w(u)))
+ end
+
+ def test_should_allow_custom_tags_with_attributes
+ text = %(<fieldset foo="bar">foo</fieldset>)
+ assert_equal(text, sanitize(text, :attributes => ['foo']))
+ 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_sanitized %(<#{tag} #{attr}="javascript:bang" title="1">boo</#{tag}>), %(<#{tag} title="1">boo</#{tag}>)
+ end
+ end
+
+ def test_should_flag_bad_protocols
+ %w(about chrome data disk hcp help javascript livescript lynxcgi lynxexec ms-help ms-its mhtml mocha opera res resource shell vbscript view-source vnd.ms.radio wysiwyg).each do |proto|
+ assert contains_bad_protocols?('src', "#{proto}://bad")
+ end
+ end
+
+ def test_should_accept_good_protocols
+ sanitized_allowed_protocols.each do |proto|
+ assert !contains_bad_protocols?('src', "#{proto}://good")
+ end
+ end
+
+ def test_should_reject_hex_codes_in_protocol
+ assert contains_bad_protocols?('src', "%6A%61%76%61%73%63%72%69%70%74%3A%61%6C%65%72%74%28%22%58%53%53%22%29")
+ assert_sanitized %(<a href="&#37;6A&#37;61&#37;76&#37;61&#37;73&#37;63&#37;72&#37;69&#37;70&#37;74&#37;3A&#37;61&#37;6C&#37;65&#37;72&#37;74&#37;28&#37;22&#37;58&#37;53&#37;53&#37;22&#37;29">1</a>), "<a>1</a>"
+ end
+
+ def test_should_block_script_tag
+ assert_sanitized %(<SCRIPT\nSRC=http://ha.ckers.org/xss.js></SCRIPT>), ""
+ end
+
+ [%(<IMG SRC="javascript:alert('XSS');">),
+ %(<IMG SRC=javascript:alert('XSS')>),
+ %(<IMG SRC=JaVaScRiPt:alert('XSS')>),
+ %(<IMG """><SCRIPT>alert("XSS")</SCRIPT>">),
+ %(<IMG SRC=javascript:alert(&quot;XSS&quot;)>),
+ %(<IMG SRC=javascript:alert(String.fromCharCode(88,83,83))>),
+ %(<IMG SRC=&#106;&#97;&#118;&#97;&#115;&#99;&#114;&#105;&#112;&#116;&#58;&#97;&#108;&#101;&#114;&#116;&#40;&#39;&#88;&#83;&#83;&#39;&#41;>),
+ %(<IMG SRC=&#0000106&#0000097&#0000118&#0000097&#0000115&#0000099&#0000114&#0000105&#0000112&#0000116&#0000058&#0000097&#0000108&#0000101&#0000114&#0000116&#0000040&#0000039&#0000088&#0000083&#0000083&#0000039&#0000041>),
+ %(<IMG SRC=&#x6A&#x61&#x76&#x61&#x73&#x63&#x72&#x69&#x70&#x74&#x3A&#x61&#x6C&#x65&#x72&#x74&#x28&#x27&#x58&#x53&#x53&#x27&#x29>),
+ %(<IMG SRC="jav\tascript:alert('XSS');">),
+ %(<IMG SRC="jav&#x09;ascript:alert('XSS');">),
+ %(<IMG SRC="jav&#x0A;ascript:alert('XSS');">),
+ %(<IMG SRC="jav&#x0D;ascript:alert('XSS');">),
+ %(<IMG SRC=" &#14; javascript:alert('XSS');">),
+ %(<IMG SRC=`javascript:alert("RSnake says, 'XSS'")`>)].each_with_index do |img_hack, i|
+ define_method "test_should_not_fall_for_xss_image_hack_#{i+1}" do
+ assert_sanitized img_hack, "<img>"
+ end
+ end
+
+ def test_should_sanitize_tag_broken_up_by_null
+ assert_sanitized %(<SCR\0IPT>alert(\"XSS\")</SCR\0IPT>), "alert(\"XSS\")"
+ end
+
+ def test_should_sanitize_invalid_script_tag
+ assert_sanitized %(<SCRIPT/XSS SRC="http://ha.ckers.org/xss.js"></SCRIPT>), ""
end
+ def test_should_sanitize_script_tag_with_multiple_open_brackets
+ assert_sanitized %(<<SCRIPT>alert("XSS");//<</SCRIPT>), "&lt;"
+ assert_sanitized %(<iframe src=http://ha.ckers.org/scriptlet.html\n<a), %(&lt;a)
+ end
+
+ def test_should_sanitize_unclosed_script
+ assert_sanitized %(<SCRIPT SRC=http://ha.ckers.org/xss.js?<B>), "<b>"
+ end
+
+ def test_should_sanitize_half_open_scripts
+ assert_sanitized %(<IMG SRC="javascript:alert('XSS')"), "<img>"
+ 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_sanitized img_hack, "<img>"
+ end
+
+ def test_should_sanitize_attributes
+ assert_sanitized %(<SPAN title="'><script>alert()</script>">blah</SPAN>), %(<span title="'&gt;&lt;script&gt;alert()&lt;/script&gt;">blah</span>)
+ end
+
+ def test_should_sanitize_illegal_style_properties
+ raw = %(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;)
+ expected = %(display: block; width: 100%; height: 100%; background-color: black; background-image: ; background-x: center; background-y: center;)
+ assert_equal expected, sanitize_css(raw)
+ end
+
+ def test_should_sanitize_xul_style_attributes
+ raw = %(-moz-binding:url('http://ha.ckers.org/xssmoz.xml#xss'))
+ assert_equal '', sanitize_css(raw)
+ end
+
+ def test_should_sanitize_invalid_tag_names
+ assert_sanitized(%(a b c<script/XSS src="http://ha.ckers.org/xss.js"></script>d e f), "a b cd e f")
+ end
+
+ def test_should_sanitize_non_alpha_and_non_digit_characters_in_tags
+ assert_sanitized('<a onclick!#$%&()*~+-_.,:;?@[/|\]^`=alert("XSS")>foo</a>', "<a>foo</a>")
+ end
+
+ def test_should_sanitize_invalid_tag_names_in_single_tags
+ assert_sanitized('<img/src="http://ha.ckers.org/xss.js"/>', "<img />")
+ end
+
+ def test_should_sanitize_img_dynsrc_lowsrc
+ assert_sanitized(%(<img lowsrc="javascript:alert('XSS')" />), "<img />")
+ end
+
+ def test_should_sanitize_div_background_image_unicode_encoded
+ raw = %(background-image:\0075\0072\006C\0028'\006a\0061\0076\0061\0073\0063\0072\0069\0070\0074\003a\0061\006c\0065\0072\0074\0028.1027\0058.1053\0053\0027\0029'\0029)
+ assert_equal '', sanitize_css(raw)
+ end
+
+ def test_should_sanitize_div_style_expression
+ raw = %(width: expression(alert('XSS'));)
+ assert_equal '', sanitize_css(raw)
+ end
+
+ def test_should_sanitize_style_attribute
+ raw = %(<div style="display:block; background:url(http://rubyonrails.com); background-image: url(rubyonrails)">foo</div>)
+ assert_equal %(<div style="display: block; background: ; background-image: ;">foo</div>), sanitize(raw, :attributes => 'style')
+ end
+
+ def test_should_sanitize_img_vbscript
+ assert_sanitized %(<img src='vbscript:msgbox("XSS")' />), '<img />'
+ end
+
+
def test_cycle_class
value = Cycle.new("one", 2, "3")
assert_equal("one", value.to_s)
@@ -374,7 +537,9 @@ def test_cycle_no_instance_variable_clashes
end
def test_strip_tags
+ assert_equal("Dont touch me", strip_tags("Dont touch me"))
assert_equal("This is a test.", strip_tags("<p>This <u>is<u> a <a href='test.html'><strong>test</strong></a>.</p>"))
+ assert_equal("Weirdos", strip_tags("Wei<<a>a onclick='alert(document.cookie);'</a>/>rdos"))
assert_equal("This is a test.", strip_tags("This is a test."))
assert_equal(
%{This is a test.\n\n\nIt no longer contains any HTML.\n}, strip_tags(
@@ -382,4 +547,15 @@ def test_strip_tags
assert_equal "This has a here.", strip_tags("This has a <!-- comment --> here.")
[nil, '', ' '].each { |blank| assert_equal blank, strip_tags(blank) }
end
+
+ def assert_sanitized(text, expected = nil)
+ assert_equal((expected || text), sanitize(text))
+ end
+
+ # pull in configuration values from ActionView::Base
+ [:sanitized_protocol_separator, :sanitized_protocol_attributes, :sanitized_bad_tags, :sanitized_allowed_tags, :sanitized_allowed_attributes, :sanitized_allowed_protocols, :sanitized_allowed_css_properties, :sanitized_allowed_css_keywords, :sanitized_shorthand_css_properties, :sanitized_uri_attributes].each do |attr|
+ define_method attr do
+ ActionView::Base.send(attr)
+ end
+ end
end
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