Switch to on-by-default XSS escaping for rails.

  This consists of:

  * String#html_safe! a method to mark a string as 'safe'
  * ActionView::SafeBuffer a string subclass which escapes anything unsafe which is concatenated to it
  * Calls to String#html_safe! throughout the rails helpers
  * a 'raw' helper which lets you concatenate trusted HTML from non-safety-aware sources (e.g. presantized strings in the DB)
  * New ERB implementation based on erubis which uses a SafeBuffer instead of a String

Hat tip to Django for the inspiration.

1 files changed, 3 insertions, 3 deletions

diff --git a/actionpack/lib/action_view/helpers/form_tag_helper.rb b/actionpack/lib/action_view/helpers/form_tag_helper.rb
index 1d851ecbd7..7688e786b1 100644
--- a/actionpack/lib/action_view/helpers/form_tag_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_tag_helper.rb
@@ -440,7 +440,7 @@ module ActionView
         concat(tag(:fieldset, options, true))
         concat(content_tag(:legend, legend)) unless legend.blank?
         concat(content)
-        concat("</fieldset>")
+        concat("</fieldset>".html_safe!)
       end
 
       private
@@ -467,14 +467,14 @@ module ActionView
 
         def form_tag_html(html_options)
           extra_tags = extra_tags_for_form(html_options)
-          tag(:form, html_options, true) + extra_tags
+          (tag(:form, html_options, true) + extra_tags).html_safe!
         end
 
         def form_tag_in_block(html_options, &block)
           content = capture(&block)
           concat(form_tag_html(html_options))
           concat(content)
-          concat("</form>")
+          concat("</form>".html_safe!)
         end
 
         def token_tag