From acdba1c6a653bf5c787d3457af95b37708be1e2b Mon Sep 17 00:00:00 2001 From: Jack McCracken Date: Mon, 2 Oct 2017 16:35:13 -0400 Subject: Add a better error message when a "null" Origin header occurs --- .../action_controller/metal/request_forgery_protection.rb | 10 ++++++++++ .../test/controller/request_forgery_protection_test.rb | 13 +++++++++++++ 2 files changed, 23 insertions(+) diff --git a/actionpack/lib/action_controller/metal/request_forgery_protection.rb b/actionpack/lib/action_controller/metal/request_forgery_protection.rb index d6cd5fd9e0..b2e6f86eeb 100644 --- a/actionpack/lib/action_controller/metal/request_forgery_protection.rb +++ b/actionpack/lib/action_controller/metal/request_forgery_protection.rb @@ -414,11 +414,21 @@ module ActionController #:nodoc: allow_forgery_protection end + NULL_ORIGIN_MESSAGE = <<-MSG.strip_heredoc + The browser returned a 'null' origin for a request with origin-based forgery protection turned on. This usually + means you have the 'no-referrer' Referrer-Policy header enabled, or that you the request came from a site that + refused to give its origin. This makes it impossible for Rails to verify the source of the requests. Likely the + best solution is to change your referrer policy to something less strict like same-origin or strict-same-origin. + If you cannot change the referrer policy, you can disable origin checking with the + Rails.application.config.action_controller.forgery_protection_origin_check setting. + MSG + # Checks if the request originated from the same origin by looking at the # Origin header. def valid_request_origin? # :doc: if forgery_protection_origin_check # We accept blank origin headers because some user agents don't send it. + raise InvalidAuthenticityToken, NULL_ORIGIN_MESSAGE if request.origin == "null" request.origin.nil? || request.origin == request.base_url else true diff --git a/actionpack/test/controller/request_forgery_protection_test.rb b/actionpack/test/controller/request_forgery_protection_test.rb index eb3d2f34a8..4822d85bcb 100644 --- a/actionpack/test/controller/request_forgery_protection_test.rb +++ b/actionpack/test/controller/request_forgery_protection_test.rb @@ -446,6 +446,19 @@ module RequestForgeryProtectionTests end end + def test_should_raise_for_post_with_null_origin + forgery_protection_origin_check do + session[:_csrf_token] = @token + @controller.stub :form_authenticity_token, @token do + exception = assert_raises(ActionController::InvalidAuthenticityToken) do + @request.set_header "HTTP_ORIGIN", "null" + post :index, params: { custom_authenticity_token: @token } + end + assert_match "The browser returned a 'null' origin for a request", exception.message + end + end + end + def test_should_block_post_with_origin_checking_and_wrong_origin old_logger = ActionController::Base.logger logger = ActiveSupport::LogSubscriber::TestHelper::MockLogger.new -- cgit v1.2.3