Flarum OpenID Connect Client

Flarum OpenID Connect Client maicol07/flarum-oidc-client

OpenID Connect client/SSO for Flarum

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Supports latest Flarum version?

This extension enables users to login with an OpenID Connect (OIDC) provider. This method can be set to the only allowed method to login (SSO mode) or used as a complementary login method (like OAuth providers)

This is a Premium extension, not a free one. You can buy a license to use it in your Flarum through Extiverse

⚠ Warning! This README might be outdated! Please always refer to the docs to ensure you are reading the latest update!

Why premium

Mostly for two reasons:

  1. You can connect to any auth system, written in any language, as long as they are compliant with the OpenID Connect specs. My other SSO extension, which is free, allows you to connect to any auth system written in PHP.
  2. It requires only configuration in the admin panel and zero code. The SSO extension requires integration with your auth system through plugins in addition to extension configuration.


Description Screenshot
Button in login modal login_modal.png
Buttons in user settings (non-SSO mode) settings_buttons_oauth.png
Buttons in user settings (SSO mode) settings_buttons_sso.png

Tested providers

Note: This list is not exhaustive. Other generic OIDC providers should work as well. If you have tested this library with a provider not listed here, please contact me to add it here.

Provider Is tested? Notes
Keycloak Client authenticator must be set to "Client id and secret"
Casdoor Code challenge must be set to S256 or PKCE should be disabled


Other extensions may be required due to third party dependencies. Check what composer says to know more.

To make JWT operations faster you'll need the gmp or bcmath extension. Read here for more.

Implemented OpenID Connect features

The extension relies on maicol07/oidc-client-php, a heavenly modified fork of JuliusPC/OpenID-Connect-PHP. You can see a list of OIDC drafts and documents that have been implemented. However, the following features aren't already implemented in the extension at the time of writing (v3.0) and they can't be set/used:

How does it work?

The extension uses the authorization code flow variant of OpenID Connect. I suggest checking these resources to learn more about OIDC flow here:

Will it work on WordPress and other CMS?

Yes, as long as you're using a plugin that provides OpenID Connect features. For WordPress, you can try this one (not tested): https://wordpress.org/plugins/miniorange-oauth-20-server/


  1. Be sure to check Extiverse instructions in your subscriptions page on how to install a premium extension via composer.json 2Install by executing the command below and activate the extension in Flarum Administration area.
composer require maicol07/flarum-oidc-client:*

⚠️ PHP versions support/drop notice

PHP versions will be supported until its EOL. If Flarum core changes PHP version before the official EOL, I'll update too the version accordingly to what they have chosen.


Upgrade by executing the command below, like with every other extension.

composer update maicol07/flarum-oidc-client:*


Since this is a premium extension, you also have premium support. So I'll help you in every error you're facing. You can contact me using the following services:



  • Version 3.0.1a.

    Unlikely to work with Flarum v1.8.5.

  • 9 additional versions.
  • Extension created.