This is a rack middleware to add Cloudflare access to your application. This means that you can turn on SSO with Cloudflare Zero Trust and ensure all requests to your application are authenticated.

This middleware is also designed to work with Rails and to raise an error that is captured by Rails error handling if any part of the process fails.

Install the gem and add to the application's Gemfile by executing:

$ bundle add rack-cloudflare-access

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install rack-cloudflare-access

You will need to have a Cloudflare the team url and AUD (audience). You can follow the Cloudflare Zero Trust Getting Started Guide followed by the Validating JSON guide in order to get your AUD.

In order to retreive your AUD you will need to decrypt a JWT token generated by Cloudflare for your application. It used to be possible to access this from your Cloudflare Dashboard but I can no longer find it. An AUD is required to ensure tokens from other applcations are not used to access your application.

[add how to get AUD or contact support]

Once you have these, you can add the middleware to your Rack application. In rails you can create an initializer:

config/initializers/cloudflare_access.rb

Rails.application.config.middleware.use(Rack::CloudflareAccess::Middleware, <teams_url>, <AUD>)

Rack, in your config.ru file add:

use(Rack::CloudflareAccess::Middleware, <teams_url>, <AUD>)

Replace the AUD and the teams_url with those from Cloudflare.

• Here is how you can find the subject
• Email - can change.

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/TigerWolf/rack-cloudflare-access. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the Rack::Cloudflare::Access project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.

• Allow for urls to be filtered out (e.g. login)
• More efficient HTTP library for getting the certs - for now just keep it simple
• Better rails integration? .present? and deep_symbolize_keys! could use quite useful