Internal endpoint address revealed in a cookie

The code responsible for this is here:
https://github.com/openstack/django_openstack_auth/blob/stable/ocata/openstack_auth/views.py#L108-L109

We should probably encrypt the value somehow before setting it.

Also https://github.com/openstack/horizon/blob/master/openstack_auth/views.py#L125-L126

Reviewed: https://review.openstack.org/593650
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=16c4f4c3a294040bb87386156dab49f2b782ce21
Submitter: Zuul
Branch: master

commit 16c4f4c3a294040bb87386156dab49f2b782ce21
Author: Radomir Dopieralski <email address hidden>
Date: Mon Aug 20 16:41:30 2018 +0200

    Don't expose endpoint URLs in the login form

    Instead of using endpoint URLs to designate regions in the login
    form and its cookies, use numbers. This way, if internal URLs are
    configured, they won't be exposed to the outside.

    Change-Id: Ifed089e7cee3075bf2dc5d1ce77b0e1b1d091ca0
    Closes-bug: #1787943

So...think about this:

OpenStack is first and foremost a set of APIs. These are web services, and they are meant for consumption from many clients, not just Horizon.

IFF Horizon is the only path into the systems, then those endpoints should not be publicly route-able. Thus, the security value of this change is merely hiding information that is non-usable.

OTOH, if the APIs are exposed to the outside world, this patch is hiding public information. It might minimize the exposure, but it really provides no security advantage.

And, the "fix" breaks WebSSO which IS a security enhancement.

I think you should revert the fix, and tag this bug as Wont' Fix.

There are public endpoints, and those can be exposed, and there are private endpoints, and those should not.

Breaking websso is not an intended feature of this fix, merely a bug that slipped through because nobody ever uses or tests WebSSO here, and the automated tests didn't catch it. It can be fixed with a literally single-line change, and I have already submitted the fix at https://review.openstack.org/#/c/611387/ — if you have a working WebSSO setup, you can help by testing it.

This issue was fixed in the openstack/horizon 15.0.0.0b1 development milestone.