BinaryCarpenter

This plugin let you enable face login without using password. Thus, you don’t have to worry about keyloggers stealing your password.
<h3>Why using face authentication for WordPress login?</h3>
WordPress has grown so much since its beginning. People use WordPress for various purposes including building a store, create API and of course blogging. With its popularity comes hackers, attackers, phishers… 
Those bad guys do everything to break into your site and steal your information, including your business.
<h3>How to prevent hackers from break into your site?</h3>
There are various ways to get access to the admin of a website. However, the most common way is to hack the username and password. It may surprise you but many people still weak password nowadays. Passwords that contain only numbers, words are in dictionary … are the easiest to hack. 
The solution would be using a strong password which is impossible to remember.
However, you still have to store that password somewhere. Maybe in a text file.
When you open the text file to copy the password, someone can steal your password by simply peek at your computer or use a recording device.
<h3>Using passwords is prone to hacks, what’s the fix</h3>
If you say that using password is a risk, you are completely right. No matter how strong a password is, it can be stolen. But, what’s the alternative?
<h3>Introducing to password-less login for WordPress</h3>
The answer to the risk we mentioned is to stop using password completely. For real.
But you may wonder, how can you use password-less login on WordPress?
It’s simpler that you think. With today’s technology, there are smarter, more secure ways to verify one’s identity.
You have known fingerprints. Now we have face.
Imagine you can login to your site the same way you open your phone.
<h3>How is this secure? Meet two-factor login</h3>
If you door has only one lock, thieves have good chance to break into your house. 
But if you have two locks, their chances drop drastically. 
That’s the same theory of two factor login. 
The one that requests to access your site (maybe you) have to complete two challenges. 
Currently, many people use password for phase one and a simple token for later. 
But we have discussed the inconvenience of using password, also the risks. 
So, why don’t we treat ourselves a bit kinder by using something easy for us at both phases?
<h3>Using two factor face authentication to login into your WordPress site</h3>
Let’s imagine this, you go to your WordPress login page, instead of typing in the password, you only look at the camera. 
The site recogizes you as its owner. It wouldn’t let you in yet. There is a chance that someone uses a statue to fake your identity. 
Instead, it will send you a token (4 to 8 digits) to your prefered devices (Email, Authenticator app).
You then send the token to the site. If you provide the correct token, you are now login.
As you can see, it is almost impossible for attackers to impersonate anywhere in the whole process.

WP Face Login – Face Authentication For WordPress

great

Enable face authentication login with ease

Paul Ryan

jojaba

the_elusive

Eduardo Larequi

Anil Natha

pkarjala

Authorizer restricts access to a WordPress site to specific users, typically students enrolled in a university course. It maintains a list of approved users that you can edit to determine who has access. It also replaces the default WordPress login/authorization system with one relying on an external server, such as Google, CAS, LDAP, or an OAuth2 provider. Finally, Authorizer lets you limit invalid login attempts to prevent bots from compromising your users’ accounts.
View or contribute to the plugin source on GitHub: <a href="https://github.com/uhm-coe/authorizer" rel="nofollow ugc">https://github.com/uhm-coe/authorizer</a>
Authorizer requires the following:
<ul>
<li>CAS server (2.x, 3.x, 4.x, 5.x, 6.x, or 7.x) or LDAP server (plugin needs the URL)</li>
<li>PHP extensions: php-ldap, php-curl, php-dom</li>
</ul>
Authorizer provides the following options:
<ul>
<li>Authentication: WordPress accounts; Google accounts; CAS accounts; LDAP accounts; OAuth2 accounts</li>
<li>Login Access: All authenticated users (all local and all external can log in); Only specific users (all local and approved external users can log in)</li>
<li>View Access: Everyone (open access); Only logged in users</li>
<li>Limit Login Attempts: Progressively increase the amount of time required between invalid login attempts.</li>
<li>Shortcode: Use the <code>[authorizer_login_form]</code> shortcode to embed a wp_login_form() outside of wp-login.php.</li>
</ul>

Authorizer

Integrates nicely with Google hosted domain/s. Couldn't be happier with how it works!

Integrates well with Google Logins

I've experimented this plugin on a multisite and everything works pretty well.

Works great even on a multisite setup

Authorizer limits login attempts, restricts access to specific users, and authenticates against external sources (OAuth2, Google, LDAP, or CAS).

WP Face Login – Face Authentication For WordPress vs Authorizer