Authress

This plugin upgrades the standard WordPress login forms with one powered by <a href="https://authress.io" rel="nofollow ugc">Authress</a> that enables:
<ul>
<li>Universal authentication
<ul>
<li>Over 40 social login providers</li>
<li>Enterprise connections (SAML, Office 365, Google Apps, and more)</li>
<li>Customer configurable SSO connections</li>
</ul>
</li>
<li>Ultra secure
<ul>
<li>User identity</li>
<li>Security access policies</li>
<li>Mitigate brute force attacks</li>
</ul>
</li>
</ul>
Which includes: 
– Azure AD and B2C 
– Office 365 
– WSO2 
– Ping Identity 
– Okta 
– Auth0 
– Keyclock 
– LinkedIn 
– Salesforce 
– Twitter 
– Google Workspace 
– Yahoo 
– Salesforce 
– Hubspot 
– Steam 
– Slack 
– And any custom OAuth2.1, OpenID, or SAML provider
With SSO Login, you can automatically support business and enterprise customers that have important security requirements for their users to use your site and platform.
<h3>Technical Notes</h3>
By using this plugin you are delegating the site authentication and profile handling to Authress. That means that you won’t need to use the WordPress database to authenticate users and the default WordPress login forms will be upgraded to support the new SSO Login flow.
Please see our <a href="https://authress.io/knowledge-base/" rel="nofollow ugc">knowledge base</a> for more information on how Authress authenticates and manages your users.
<h4>Migrating Existing Users</h4>
Authress allows multiple authentication providers. You can have social providers like Facebook, Twitter, Google+, a database of users and passwords (just like WordPress), or you can use an Enterprise directories like, Office365, Google Apps, SAML, OpenID, OAuth2.1. All those authentication providers are supported and more.
<h3>How to customize this plugin</h3>
This plugin provides extension points to make it easier to configure it exactly as you need. Check out the full docs: 
* <a href="https://github.com/Authress/wordpress-sso-login/blob/main/docs/customizations.md" rel="nofollow ugc">SSO Login customizations</a>

SSO Login – Universal (OAuth + SAML)

SSO Login provides user login, business authentication, SSO, Social login, and Single Sign-On for all sites.

mitcho (Michael Yoshitaka Erlewine)

Will Norris

Brian Haas

Junaid Ahmed

michaelryanmcneill

bshelton229

deric.crago

alhrath

Dan Dalpiaz

Jonathan Champ

This plugin is designed to support integrating your WordPress site into your existing identity management infrastructure using a <a href="https://incommon.org/software/shibboleth/" rel="nofollow ugc">Shibboleth</a> Service Provider.
WordPress can be configured so that all standard login requests will be sent to your configured Shibboleth Identity Provider or Discovery Service. Upon successful authentication, a new WordPress account will be automatically provisioned for the user if one does not already exist. User attributes (username, first name, last name, display name, nickname, and email address) can be synchronized with your enterprise’s system of record each time the user logs into WordPress.
Finally, the user’s role within WordPress can be automatically set (and continually updated) based on any attribute Shibboleth provides. For example, you may decide to give users with an eduPersonAffiliation value of faculty the WordPress role of editor, while the eduPersonAffiliation value of student maps to the WordPress role contributor. Or you may choose to limit access to WordPress altogether using a special eduPersonEntitlement value.
<h4>Contribute on GitHub</h4>
This plugin is actively maintained by <a href="https://profiles.wordpress.org/michaelryanmcneill" rel="nofollow ugc">michaelryanmcneill</a> and the WordPress community, <a href="https://github.com/michaelryanmcneill/shibboleth" rel="nofollow ugc">using GitHub</a>. Contributions are welcome, via pull request, <a href="https://github.com/michaelryanmcneill/shibboleth" rel="nofollow ugc">on GitHub</a>. Issues can be submitted <a href="https://github.com/michaelryanmcneill/shibboleth/issues" rel="nofollow ugc">on the issue tracker</a>.

Shibboleth

We had no trouble installing and configuring the plugin. When we ran into an issue, it was no trouble to interact with the plugin authors. 

This plugin just works

Allows WordPress to externalize user authentication and account creation to a Shibboleth Service Provider.

SSO Login – Universal (OAuth + SAML) vs Shibboleth