Handling custom multi-factor authentication

You can use global events to define custom actions that the system performs after a user tries to sign in to Kentico with multi-factor authentication enabled. See the SecurityEvents section of the global event reference to learn more about the available options.

When implementing a custom authentication factor, disable the Display secret key option in Settings -> Security & Membership -> Authentication.

To set up a custom action that the system performs after a user signs in to Kentico with multi-factor authentication enabled, implement a handler for the SecurityEvents.MultiFactorAuthenticate.Execute event. For example, you can implement functionality that sends users an SMS text or email with a passcode.

The following code is an example of a custom module class that sends an email with a valid passcode to users who attempt to sign in with multi-factor authentication enabled.

using CMS;
using CMS.DataEngine;
using CMS.Membership;
using CMS.EmailEngine;

// Registers the custom module into the system
[assembly: RegisterModule(typeof(CustomMFAuthenticationModule))]

public class CustomMFAuthenticationModule : Module
{
    // Module class constructor, the system registers the module under the name "CustomMFAuthentication"
    public CustomMFAuthenticationModule()
        : base("CustomMFAuthentication")
    {
    }

    // Contains initialization code that is executed when the application starts
    protected override void OnInit()
    {
        base.OnInit();

        // Assigns a handler to the SecurityEvents.MultiFactorAuthenticate.Execute event
        // This event occurs when users try to sign in to Kentico with multi-factor authentication enabled
        SecurityEvents.MultiFactorAuthenticate.Execute += MFAuthentication_Execute;
    }

    // Handler method that sends the passcode emails
    // You can replace it with your custom code
    private void MFAuthentication_Execute(object sender, AuthenticationEventArgs e)
    {
        // Gets the user's email address
        string userEmail = e.User.Email;

        if (userEmail != null && userEmail != "")
        {
            // Creates the email message
            EmailMessage msg = new EmailMessage();

            msg.From = "system@localhost.local";
            msg.Recipients = userEmail;
            msg.Subject = "Authentication passcode";
            msg.Priority = EmailPriorityEnum.High;
            msg.Body = "<html><body><p>Your authentication passcode: "
                       + e.Passcode + " (valid for 5 minutes)"
                       + "</p></body></html>";

            // Sends out the email message
            EmailSender.SendEmail(msg);
        }
    }
}

When the multi-factor authentication event occurs, the system generates a valid passcode for the given user. You can access the passcode in the Passcode property of the handler's AuthenticationEventArgs parameter, and use any type of API to deliver the information to the authenticating user.


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