Rails request forgery protection settings

Question

Hey,

please help a newbie in Rails :) I have protect_from_forgery call (which is given by default) with no attributes in my ApplicationController class.

Basically here's the code:

class ApplicationController < ActionController::Base
  helper :all # include all helpers, all the time
  protect_from_forgery
  helper_method :current_user_session, :current_user
  filter_parameter_logging :password, :password_confirmation

What I assume it should do is: it should prevent any POST requests without correct authenticity_token. But when I send post request with jQuery like the one below, it works fine (there's update statement that is executed in the database)!

$.post($(this).attr("href"), { _method: "PUT", data: { test: true } });

I see in console that there's no authenticity_token among sent parameters, but request is still considered valid. Why is that?

UPD Found config setting in config/environments/development.rb

config.action_controller.consider_all_requests_local = true

Because of the DEV environment and local requests, these jQuery post requests were OK.

Answer 1

Silly question, perhaps: Are you sure you're subclassing ApplicationController? What's your route map look like? And what version of Rails (just for clarity)?

Did you verify that the call from jQuery is actually a POST and not a GET? (I know, it seems obvious). Rails will only perform the protection on non-GET requests.

Also, what is the content-type of the request that's going out. Rails will also only perform the protection, according to the docs, if it's an HTML/Javascript request.

Answer 2

There is nothing wrong with your code as long as the request $.post($(this).attr("href"), { _method: "PUT", data: { test: true } }); is executed from within the app itself. If you had another app running elsewhere, say for example on localhost:3001, and you sent a post from there then it won't work. Infact if you are on firefox > 3.0 it has an early implementation of cross site xhr too. For example you can send a POST from any other site (but this works provided protect_from_forgery is turned off!). The reason why auth token is not necessary for xhr is that cross site xhr is disabled. So it is safe to use xhr without providing auth token. If you try from any where else other than your app, i am sure it will raise an exception asking for an auth token. Also you should have a crossdomain.xml defined to prevent access from outside sources.

Try doing this: curl -X -d url_endpoint_of_your_app. See if you get a 200 response code. If you do then there is something fishy.