Add secure `X-Download-Options` and `X-Permitted-Cross-Domain-Policies` to default headers set.

actionpack/CHANGELOG.md

+*   Add secure `X-Download-Options` and `X-Permitted-Cross-Domain-Policies` to
+    default headers set.
+
+    *Guillermo Iguaran*
+
 *   Add headless firefox support to System Tests.
 
     *bogdanvlviv*

actionpack/lib/action_dispatch/railtie.rb

@@ -26,7 +26,9 @@ class Railtie < Rails::Railtie # :nodoc:
     config.action_dispatch.default_headers = {
       "X-Frame-Options" => "SAMEORIGIN",
       "X-XSS-Protection" => "1; mode=block",
-      "X-Content-Type-Options" => "nosniff"
+      "X-Content-Type-Options" => "nosniff",
+      "X-Download-Options" => "noopen",
+      "X-Permitted-Cross-Domain-Policies" => "none"
     }
 
     config.action_dispatch.cookies_rotations = ActiveSupport::Messages::RotationConfiguration.new

actionpack/test/controller/metal_test.rb

@@ -9,7 +9,7 @@ def hello
     end
   end
 
-  def test_response_has_default_headers
+  def test_response_does_not_have_default_headers
     original_default_headers = ActionDispatch::Response.default_headers
 
     ActionDispatch::Response.default_headers = {

actionpack/test/dispatch/response_test.rb

@@ -311,13 +311,15 @@ def test_only_set_charset_still_defaults_to_text_html
     end
   end
 
-  test "read x_frame_options, x_content_type_options and x_xss_protection" do
+  test "read x_frame_options, x_content_type_options, x_xss_protection, x_download_options and x_permitted_cross_domain_policies" do
     original_default_headers = ActionDispatch::Response.default_headers
     begin
       ActionDispatch::Response.default_headers = {
         "X-Frame-Options" => "DENY",
         "X-Content-Type-Options" => "nosniff",
-        "X-XSS-Protection" => "1;"
+        "X-XSS-Protection" => "1;",
+        "X-Download-Options" => "noopen",
+        "X-Permitted-Cross-Domain-Policies" => "none"
       }
       resp = ActionDispatch::Response.create.tap { |response|
         response.body = "Hello"
@@ -327,6 +329,8 @@ def test_only_set_charset_still_defaults_to_text_html
       assert_equal("DENY", resp.headers["X-Frame-Options"])
       assert_equal("nosniff", resp.headers["X-Content-Type-Options"])
       assert_equal("1;", resp.headers["X-XSS-Protection"])
+      assert_equal("noopen", resp.headers["X-Download-Options"])
+      assert_equal("none", resp.headers["X-Permitted-Cross-Domain-Policies"])
     ensure
       ActionDispatch::Response.default_headers = original_default_headers
     end