OmniAuth::OpenIDConnect

Originally was omniauth-openid-connect

I've forked this repository and launch as separate gem because maintaining of original was dropped.

Installation

Add this line to your application's Gemfile:

gem 'omniauth_openid_connect'

And then execute:

$ bundle

Or install it yourself as:

$ gem install omniauth_openid_connect

Supported Ruby Versions

OmniAuth::OpenIDConnect is tested under 2.7, 3.0, 3.1, 3.2, 3.3, 3.4

Usage

Example configuration

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :openid_connect, {
    name: :my_provider,
    scope: [:openid, :email, :profile, :address],
    response_type: :code,
    uid_field: "preferred_username",
    client_options: {
      port: 443,
      scheme: "https",
      host: "myprovider.com",
      identifier: ENV["OP_CLIENT_ID"],
      secret: ENV["OP_SECRET_KEY"],
      redirect_uri: "http://myapp.com/users/auth/openid_connect/callback",
    },
  }
end

with Devise

Devise.setup do |config|
  config.omniauth :openid_connect, {
    name: :my_provider,
    scope: [:openid, :email, :profile, :address],
    response_type: :code,
    uid_field: "preferred_username",
    client_options: {
      port: 443,
      scheme: "https",
      host: "myprovider.com",
      identifier: ENV["OP_CLIENT_ID"],
      secret: ENV["OP_SECRET_KEY"],
      redirect_uri: "http://myapp.com/users/auth/openid_connect/callback",
    },
  }
end

Options Overview

Field	Description	Required	Default	Example/Options
name	Arbitrary string to identify connection and identify it from other openid_connect providers	no	String: openid_connect	:my_idp
issuer	Root url for the authorization server	yes		https://myprovider.com
discovery	Should OpenID discovery be used. This is recommended if the IDP provides a discovery endpoint. See client config for how to manually enter discovered values.	no	false	one of: true, false
client_auth_method	Which authentication method to use to authenticate your app with the authorization server	no	Sym: basic	"basic", "jwks"
scope	Which OpenID scopes to include (:openid is always required)	no	Array [:openid]	[:openid, :profile, :email]
response_type	Which OAuth2 response type to use with the authorization request	no	String: code	one of: 'code', 'id_token'
state	A value to be used for the OAuth2 state parameter on the authorization request. Can be a proc that generates a string.	no	Random 16 character string	Proc.new { SecureRandom.hex(32) }
require_state	Should the callback phase require that a state is present. If send_state is true, then the callback state must match the authorize state. This is recommended, not required by the OIDC specification.	no	true	false
send_state	Should the authorize phase send a state parameter - this is recommended, not required by the OIDC specification	no	true	false
response_mode	The response mode per spec	no	nil	one of: :query, :fragment, :form_post, :web_message
display	An optional parameter to the authorization request to determine how the authorization and consent page	no	nil	one of: :page, :popup, :touch, :wap
prompt	An optional parameter to the authorization request to determine what pages the user will be shown	no	nil	one of: :none, :login, :consent, :select_account
send_scope_to_token_endpoint	Should the scope parameter be sent to the authorization token endpoint?	no	true	one of: true, false
post_logout_redirect_uri	The logout redirect uri to use per the session management draft	no	empty	https://myapp.com/logout/callback
uid_field	The field of the user info response to be used as a unique id	no	'sub'	"sub", "preferred_username"
extra_authorize_params	A hash of extra fixed parameters that will be merged to the authorization request	no	Hash	{"tenant" => "common"}
allow_authorize_params	A list of allowed dynamic parameters that will be merged to the authorization request	no	Array	[:screen_name]
pkce	Enable PKCE flow	no	false	one of: true, false
pkce_verifier	Specify a custom PKCE verifier code.	no	A random 128-char string	Proc.new { SecureRandom.hex(64) }
pkce_options	Specify a custom implementation of the PKCE code challenge/method.	no	SHA256(code_challenge) in hex	Proc to customise the code challenge generation
client_options	A hash of client options detailed in its own section	yes
jwt_secret_base64	For HMAC with SHA2 (e.g. HS256) signing algorithms, specify the base64-encoded secret used to sign the JWT token. Defaults to the OAuth2 client secret if not specified.	no	client_options.secret	"bXlzZWNyZXQ=\n"
logout_path	The log out is only triggered when the request path ends on this path	no	'/logout'	'/sign_out'
acr_values	Authentication Class Reference (ACR) values to be passed to the authorize_uri to enforce a specific level, see RFC9470	no	nil	"c1 c2"

Client Config Options

These are the configuration options for the client_options hash of the configuration.

Field	Description	Default	Replaced by discovery?
identifier	The OAuth2 client_id
secret	The OAuth2 client secret
redirect_uri	The OAuth2 authorization callback url in your app
scheme	The http scheme to use	https
host	The host of the authorization server	nil
port	The port for the authorization server	443
audience	The intended consumer (aud field) of the id_token	nil
authorization_endpoint	The authorize endpoint on the authorization server	/authorize	yes
token_endpoint	The token endpoint on the authorization server	/token	yes
userinfo_endpoint	The user info endpoint on the authorization server	/userinfo	yes
jwks_uri	The jwks_uri on the authorization server	/jwk	yes
end_session_endpoint	The url to call to log the user out at the authorization server	nil	yes

Additional Configuration Notes

• name is arbitrary, I recommend using the name of your provider. The name configuration exists because you could be using multiple OpenID Connect providers in a single app.

NOTE: if you use this gem with Devise you should use :openid_connect name, or Devise would route to 'users/auth/:provider' rather than 'users/auth/openid_connect'

• response_type tells the authorization server which grant type the application wants to use, currently, only :code (Authorization Code grant) and :id_token (Implicit grant) are valid.
• If you want to pass state parameter by yourself. You can set Proc Object. e.g. state: Proc.new { SecureRandom.hex(32) }
• nonce is optional. If don't want to pass "nonce" parameter to provider, You should specify false to send_nonce option. (default true)
• Support for other client authentication methods. If don't specified :client_auth_method option, automatically set :basic.
• Use "OpenID Connect Discovery", You should specify true to discovery option. (default false)
• In "OpenID Connect Discovery", generally provider should have Webfinger endpoint. If provider does not have Webfinger endpoint, You can specify "Issuer" to option. e.g. issuer: "https://myprovider.com" It means to get configuration from "https://myprovider.com/.well-known/openid-configuration".
• The uid is by default using the sub value from the user_info response, which in some applications is not the expected value. To avoid such limitations, the uid label can be configured by providing the omniauth uid_field option to a different label (i.e. preferred_username) that appears in the user_info details.
• The issuer property should exactly match the provider's issuer link.
• The response_mode option is optional and specifies how the result of the authorization request is formatted.
• Some OpenID Connect providers require the scope attribute in requests to the token endpoint, even if this is not in the protocol specifications. In those cases, the send_scope_to_token_endpoint property can be used to add the attribute to the token request. Initial value is true, which means that the scope attribute is included by default.

Additional notes

• In some cases, you may want to go straight to the callback phase - e.g. when requested by a stateless client, like a mobile app. In such example, the session is empty, so you have to forward certain parameters received from the client. Currently supported ones are code_verifier and nonce - simply provide them as the /callback request parameters.

For the full low down on OpenID Connect, please check out the spec.

Contributing

1. Fork it ( http://github.com/omniauth/omniauth_openid_connect/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Cover your changes with tests and make sure they're green (bundle install && bundle exec rake test)
4. Commit your changes (git commit -am 'Add some feature')
5. Push to the branch (git push origin my-new-feature)
6. Create new Pull Request