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Previously, our rate-limiting code trusted the entire `X-Forwarded-For` header, allowing a malicious client to spoof that header and evade rate-limiting. This commit introduces a new module and setting allowing us to make a more conservative choice of IPs. - Create new `openedx.core.djangoapps.util.ip` module for producing the IP "external chain" for requests based on the XFF header and the REMOTE_ADDR. - Include a function that gives the safest choice of IPs. - Add new setting `CLOSEST_CLIENT_IP_FROM_HEADERS` for configuring how the external chain is derived (i.e. setting the trust boundary). Currently has a default, but we may want to make it mandatory in the future. - Change `django-ratelimit` code to use the proximate IP in the external chain -- the one just outside the trust boundary. Also: - Change `XForwardedForMiddleware` to use more conservative choice for its `REMOTE_ADDR` override - Other adjustments to `XForwardedForMiddleware` as needed in order to initialize new module and support code that needs the real `REMOTE_ADDR` value - Metrics for observability into the change (and XFF composition) - Feature switch to restore legacy mode if needed This also gives us a path forward to removing use of the django-ipware package, which is no longer maintained and has a handful of bugs that make it difficult to use safely. Internal ticket: ARCHBOM-2056
This is the core repository of the Open edX software. It includes the LMS
(student-facing, delivering courseware), and Studio (course authoring)
components.
Installation
------------
Installing and running an Open edX instance is not simple. We strongly
recommend that you use a service provider to run the software for you. They
have free trials that make it easy to get started:
https://openedx.org/get-started/
If you will be modifying edx-platform code, the `Open edX Developer Stack`_ (Devstack) is
a Docker-based development environment.
If you want to run your own Open edX server and have the technical skills to do
so, `Open edX Installation Options`_ explains your options.
.. _Open edX Developer Stack: https://github.com/edx/devstack
.. _Open edX Installation Options: https://openedx.atlassian.net/wiki/spaces/OpenOPS/pages/60227779/Open+edX+Installation+Options
License
-------
The code in this repository is licensed under version 3 of the AGPL
unless otherwise noted. Please see the `LICENSE`_ file for details.
.. _LICENSE: https://github.com/edx/edx-platform/blob/master/LICENSE
More about Open edX
-------------------
See the `Open edX site`_ to learn more about the Open edX world. You can find
information about hosting, extending, and contributing to Open edX software. In
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.. _Open edX site: https://openedx.org
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-------------
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How to Contribute
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Reporting Security Issues
-------------------------
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.. _individual contributor agreement: https://openedx.org/cla
.. _CONTRIBUTING: https://github.com/edx/edx-platform/blob/master/CONTRIBUTING.rst