onelogin

This SAML plugin eliminates passwords and allows you to authenticate WordPress users (typically editors) against your existing Active Directory or LDAP server as well increase security using YubiKeys or VeriSign VIP Access via OneLogin. OneLogin is pre-integrated with thousands of apps and handles all of your SSO needs in the cloud and behind the firewall.
<ul>
<li>Eliminate passwords in WordPress</li>
<li>Allow users to sign into WordPress with their Active Directory or LDAP credentials</li>
<li>Give users one-click access from your intranet</li>
<li>Increase security using browser PKI certificates or two-factor authentication from Yubico or VeriSign</li>
<li>Easily prevent access from former employees and contractors</li>
</ul>
If you used this plugin before 2.2.0 with just-in-time provision active, Read: https://wpvulndb.com/vulnerabilities/8508 
To mitigate that bug, place the script at the root of wordpress and execute it (later remove it) https://gist.github.com/pitbulk/a8223c90a3534e9a7d5e0a93009a094f

OneLogin SAML SSO

This plugin provides single sign-on via SAML and gives users one-click access to their WordPress accounts from identity providers like OneLogin.

heiglandreas

Use your existing LDAP as authentication-backend for your wordpress!
So what are the differences to other WordPress-LDAP-Authentication-Plugins?
<ul>
<li>Flexible: You are totaly free in which LDAP-backend to use. Due to the extensive configuration you can freely decide how to do the authentication of your users. It simply depends on your filters</li>
<li>Independent: As soon as a user logs in, it is added/updated to the WordPress’ user-database to allow wordpress to always use the correct data. You only have to administer your users once.</li>
<li>Failsafe: Due to the users being created in WordPress’ User-database they can also log in when the LDAP-backend currently is gone.</li>
<li>Role-Aware: You can map WordPress’ roles to values of an existing LDAP-attribute.</li>
</ul>
For more Information on the configuration have a look at https://github.com/heiglandreas/authLdap

authLdap

This plugin is the only one in WP.org which works out of the box, it's super easy to set up and even has user group mapping included. Thanks once again and totally recommended to every one.

Karolina

Works perfectly and has group mapping!

Use your existing LDAP flexible as authentication backend for WordPress

OneLogin SAML SSO vs authLdap