Passkey Authentication with Client SDKs

WebAuthn lets you authenticate end users using the strong authenticators that are now often built right into devices, including biometrics (fingerprint, facial, or iris recognition) and secure hardware keys (for example, Yubico, CryptoTrust, or Thedis). These secure hardware keys, also known as passkeys, can be USB tokens or embedded security features in smartphones or computers. A typical method for implementing WebAuthn has two sets of functionality to program: user onboarding and session validation.

Client SDK

Install SDK

npm i --save @descope/react-sdk

Import and initialize SDK

Parameters:

• baseUrl: Custom domain that must be configured to manage token response in cookies. This makes sure every request to our service is through your custom domain, preventing accidental domain blockages.
• baseStaticUrl: Custom domain to override the base URL that is used to fetch static files.

import { AuthProvider } from '@descope/react-sdk'
import { Descope, useDescope } from '@descope/react-sdk'
 
const AppRoot = () => {
	return (
		<AuthProvider
			projectId="__ProjectID__"
			baseUrl = "https://auth.app.example.com"
		>
			<App />
		</AuthProvider>
	);
};

User Sign-Up

The first step for implementing WebAuthn authentication is Sign-Up. Within the web-js-sdk, the Sign-Up function is one call to the Descope Service. This defers from the backend SDKs which require a start call and stop call for each of the tasks covered here, as the backend must push the information to the browser and receive further information back from the browser. The new end user will be registered after the full WebAuthn flow has been completed. The below sample code demonstrates how to implement WebAuthn Sign-Up within your client application.

// Args:
//    loginId: email or phone - becomes the externalID for the user from here on and also used for delivery
const loginId = "xxxxx"
//    name: User's name. Ex: firstName lastName
const name = "Joe Persons"
 
const descopeSdk = useDescope();
let resp = await descopeSdk.webauthn.signUp(loginId,name)
if (resp.ok != true) {
  console.log("Failed to complete WebAuthn sign-up")
  console.log("Status Code: " + resp.code)
  console.log("Error Code: " + resp.error.errorCode)
  console.log("Error Description: " + resp.error.errorDescription)
  console.log("Error Message: " + resp.error.errorMessage)
}
else {
  console.log("Successfully completed WebAuthn sign-up")
  console.log(resp)
}

User Sign-In

For signing in with an existing user via WebAuthn, you will utilize the signIn function. Within the web-js-sdk, the Sign-In function is one call. This defers from the backend SDKs which require a start call and stop call for each of the tasks covered here, as the backend must push the information to the browser and receive further information back. Upon successful verification of the Sign-In, the user will be logged in and the response will include the JWT information. The below sample code demonstrates how to implement WebAuthn Sign-In within your client application.

// Args:
//    loginId: email or phone - must be same as provided at the time of signup.
const loginId = "xxxxx"
//    loginOptions (LoginOptions): this allows you to configure behavior during the authentication process.
const loginOptions = {
      "stepup": false,
      "mfa": false,
      "customClaims": {"claim": "Value1"},
      "templateOptions": {"option": "Value1"}
    }
//    refreshToken (optional): the user's current refresh token in the event of stepup/mfa
 
const descopeSdk = useDescope();
let resp = await descopeSdk.webauthn.signIn(loginId, loginOptions)
if (resp.ok != true) {
  console.log("Failed to sign-in via WebAuthn")
  console.log("Status Code: " + resp.code)
  console.log("Error Code: " + resp.error.errorCode)
  console.log("Error Description: " + resp.error.errorDescription)
  console.log("Error Message: " + resp.error.errorMessage)
}
else {
  console.log("Successfully signed in via WebAuthn")
  console.log(resp)
}

User Sign-Up or In

Within the web-js-sdk, the Sign-Up Or In function is one call to the Descope Service. This defers from the backend SDKs which require a start call and stop call for each of the tasks covered here, as the backend must push the information to the browser and receive further information back from the browser. The new end user will be registered after the full WebAuthn flow has been completed. The below sample code demonstrates how to implement WebAuthn Sign-Up or in within your client application.

// Args:
//    loginId: email or phone - becomes the externalID for the user from here on and also used for delivery
const loginId = "xxxxx"
//    name: User's name. Ex: firstName lastName
const name = "Joe Persons"
 
const descopeSdk = useDescope();
let resp = await descopeSdk.webauthn.signUpOrIn(loginId,name)
if (resp.ok != true) {
  console.log("Failed to complete WebAuthn sign-up or in")
  console.log("Status Code: " + resp.code)
  console.log("Error Code: " + resp.error.errorCode)
  console.log("Error Description: " + resp.error.errorDescription)
  console.log("Error Message: " + resp.error.errorMessage)
}
else {
  console.log("Successfully completed WebAuthn sign-up or in")
  console.log(resp)
}

Add User Device

The update function within the web-js-sdk adds a new biometric signature or a device to an existing user account. You should use this function in scenarios where a user has already authenticated (signup complete) with your service via another method. This function requires a valid refresh token from another authentication method. Within the web-js-sdk, the update function is one call. This defers from the backend SDKs which require a start call and stop call for each of the tasks covered here, as the backend must push the information to the browser and receive further information back. The below sample code demonstrates how to implement WebAuthn update within your client application.

// Args:
//    loginId: email or phone - must be same as provided at the time of signup.
const loginId = "xxxxx"
//     token: a refresh token for the user you are wanting to add a device for
const token = "xxxxxx"
 
const descopeSdk = useDescope();
let resp = await descopeSdk.webauthn.update(loginId, token)
if (resp.ok != true) {
  console.log("Failed to add device via WebAuthn")
  console.log("Status Code: " + resp.code)
  console.log("Error Code: " + resp.error.errorCode)
  console.log("Error Description: " + resp.error.errorDescription)
  console.log("Error Message: " + resp.error.errorMessage)
}
else {
  console.log("Successfully added device via via WebAuthn")
  console.log(resp)
}

Session Validation

The final step of completing the authentication with Descope is to validate the user session. Descope provides rich session management capabilities, including configurable session timeouts and logout functions. You can find the details and sample code for client session validation here.