Authentication

Identity Platform allows users to authenticate to your apps and services, like multi-tenant SaaS apps, mobile/web apps, games, APIs and more. Identity Platform provides secure, easy-to-use authentication if you're building a service on Google Cloud, on your own backend or on another platform.

Identity Platform provides backend services and works with the easy-to-use SDKs and ready-made UI libraries to authenticate users to your app. It supports authentication using passwords, phone numbers, popular federated identity providers like Google, Facebook, Twitter, and any provider that supports SAML or OpenID Connect protocol.

Identity Platform integrates tightly with Google Cloud services, and it leverages industry standards like OAuth 2.0 and OpenID Connect, so it can be easily integrated with your custom backend.

Key capabilities

You can use the SDK to integrate one or more sign-in methods into your app.

Authentication using the SDK

Email and password based authentication

Authenticate users with their email addresses and passwords. The SDK provides methods to create and manage users that use their email addresses and passwords to sign in. Identity Platform also handles sending password reset emails.

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Federated identity provider integration

Authenticate users by integrating with federated identity providers. The SDK provides methods that allow users to sign in with their Google, Facebook, Twitter, and GitHub accounts.

Google	iOS Android Web C++ Unity
Facebook	iOS Android Web C++ Unity
Twitter	iOS Android Web C++ Unity
GitHub	iOS Android Web C++ Unity

Phone number authentication

Authenticate users by sending SMS messages to their phones.

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Custom auth system integration

Connect your app's existing sign-in system to Identity Platform, exchanging tokens generated on your server for Identity Platform tokens that can be used for your apps running in Google Cloud, Firebase, or other services.

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Anonymous auth

Use features that require authentication without requiring users to sign in first by creating temporary anonymous accounts. If the user later chooses to sign up, you can upgrade the anonymous account to a regular account, so the user can continue where they left off.

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How does it work?

To sign a user into your app, you first get authentication credentials from the user. These credentials can be the user's email address and password, a SAML assertion, or an OAuth token from a federated identity provider. In the case of federated identity providers, the providers return those tokens to Identity Platform's authentication handler on the /__auth/handler endpoint. This service is hosted by Google, so you don't have to receive and validate the authentication artifact. After the tokens are received, our backend services will verify them and return a response to the client.

After a successful sign in, you can access the user's basic profile information, and you can control the user's access to data stored in Google Cloud or other products. You can also use the provided authentication token to verify the identity of users in your own backend services.

Implementation paths

Using the SDK

Set up sign-in methods

For email address and password or phone number sign-in and any federated identity providers you want to support, enable them in the Google Cloud console and complete any configuration required by the identity provider, such as setting your OAuth redirect URL.

Implement UI flows for your sign-in methods

For email address and password sign-in, implement a flow that prompts users to type their email addresses and passwords. For phone number sign-in, create a flow that prompts users for their phone number, and then for the code from the SMS message they receive. For federated sign-in, implement the flow required by each provider.

Pass the user's credentials to the SDK

Pass the user's email address and password or the OAuth token that was acquired from the federated identity provider to the SDK.

Using open source UI components

Set up sign-in methods

Customize the sign-in UI

You can customize the sign-in UI by setting FirebaseUI options. To customize even further, fork the code on GitHub.

Use FirebaseUI to perform the sign-in flow

Import the FirebaseUI library, specify the sign-in methods you want to support, and initiate the FirebaseUI sign-in flow.

What's next

Learn more about users in an Identity Platform project, then see the integration guides for the sign-in providers you want to support:

iOS Android Web C++ Unity Admin OIDC (Web) SAML (Web)