This project was forked from m0n9oose/omniauth_openid_connect since a number of important bug fixes have not been merged in the past year.

Originally was omniauth-openid-connect

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

Build Status


Add this line to your application's Gemfile:

gem 'gitlab-omniauth-openid-connect', require: '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 2.4, 2.5, 2.6, 2.7


Example configuration

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: "",
    identifier: ENV["OP_CLIENT_ID"],
    secret: ENV["OP_SECRET_KEY"],
    redirect_uri: "",

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
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 { SecureRandom.hex(32) }
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 authrization 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
uid_field The field of the user info response to be used as a unique id no 'sub' "sub", "preferred_username"
client_options A hash of client options detailed in its own section yes
jwt_secret For HMAC with SHA2 (e.g. HS256) signing algorithms, specify the secret used to sign the JWT token. Defaults to the OAuth2 client secret if not specified. For secrets in binary, use jwt_secret_base64. no client_options.secret "mysecret"
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. jwt_secret takes precedence. no client_options.secret "bXlzZWNyZXQ=\n"

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
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 paramete by yourself. You can set Proc Object. e.g. state: { 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: "" It means to get configuration from "".
  • 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.

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


  1. Fork it ( )
  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