WardenOpenidBearer

Warden strategy for authentication with OpenID-Connect bearer tokens.

This gem is like the warden_openid_auth gem, except that it only provides support for the very last step of the OAuth code flow, i.e. when the resource server / relying party (your Ruby Web app) validates and decodes the bearer token.

Use this gem if your client-side Web (or mobile) app will be taking care of the rest of the OAuth2 motions, such as redirecting (or opening a popup window) to the authentication server at login time, managing and refreshing tokens, doing all these unspeakable things with iframes, etc.

Usage

In a Rails application

1. Add the rails_warden gem into your application
2. Add the following to e.g. config/initializers/authentication.rb:

   Rails.application.config.middleware.use RailsWarden::Manager do |manager|
     manager.default_strategies WardenOpenidBearer::Strategy.register!
     WardenOpenidBearer.configure do |oidc|
       oidc.openid_metadata_url = "https://example.com/.well-known/openid-configuration"
       oidc.scope = ["openid", "email"]
       oidc.redirect_uri = ["openid", "email"]
       # Optional — Explicit OpenID-Connect server certificate (e.g. for a development rig):
       oidc.openid_server_certificate = <<-CERT
   -----BEGIN CERTIFICATE-----
   MIIDCTBLAHBLAHBLAH==
   -----END CERTIFICATE-----
   CERT
     end
   
     manager.failure_app = Proc.new { |_env|
       ['401', {'Content-Type' => 'application/json'}, [{ error: 'Unauthorized' }.to_json]]
     }
   end

3. Access control must be explicitly added to your controllers, e.g.

   class MyController < ApplicationController
     before_action do
       authenticate!
     end
   end

Subclassing

Subclassing WardenOpenidBearer::Strategy is the recommended way to

• support more than one authentication server (overriding valid?, metadata_url and/or cache_timeout),
• provide user hydration into the class of your choice (overriding user_of_claims).

More details available in the rubydoc comments of lib/warden_openid_bearer/strategy.rb.

Installation

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

$ bundle add warden_openid_bearer

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

$ gem install warden_openid_bearer

Development

After checking out the Git repository, run bin/setup to install dependencies. Then, run bundle exec rake to run the test suite and linter checks. You can also run bin/console for an interactive prompt that will allow you to experiment.

Debugger

The debugger gem is a development-time requirement (in the Gemfile). In order to activate it:

1. Uncomment the line that says require "debug" in ./spec/spec_helper.rb
2. Stick debugger somewhere in the source or test code
3. Run the test suite

Local Install

To install this gem onto your local machine, run bundle exec rake install.

Release

To release a new version:

1. Make sure that the version you want to publish is the current master branch on GitHub, and that the tests are green
2. Check out the master branch in your working directory
3. Update the version number in version.rb
4. 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

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/epfl-si/warden_openid_bearer .

License

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