Custom authenticator

Use mobile numbers for user authentication in Keycloak

Use mobile numbers for user authentication in Keycloak

I recently worked on a project that required using a mobile number for user authentication, instead of the traditional username and password. Almost everyone has a unique mobile number, so the requirement made sense. Our authentication tool is Keycloak, which does not ship with an option for mobile-based authentication. Instead, my team developed a custom authentication executor to meet the requirement.

In this article, I show you how to use Keycloak’s authentication service provider interface (SPI) to write a custom MobileAuthenticator class and then instantiate it with an AuthenticationFactory. I also show you how to package and compile the mobile authentication project using Maven and how to create a custom mobile authentication flow for Keycloak.

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