What are claims Auth?

What are claims Auth?

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The Firebase Admin SDK allows you to integrate your own servers into Firebase Authentication. You can use the Firebase Admin SDK to manage your users or authentication tokens. There are several reasons why we recommend doing so:

You can integrate an external user system with Firebase. For example, if you have a user database or want to integrate the system with a third-party identity provider that is not natively supported by Firebase Authentication.

To do this, you can create custom tokens with arbitrary claims that identify the user. These custom tokens can be used to access the Firebase Authentication service in a client application and adopt the identity described in the token claims.

However, you can also use the service to identify those users on your own server. This allows you to perform logical tasks on the server securely on behalf of users who have logged in with Firebase Authentication.

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The Firebase Admin SDK allows you to integrate your own servers into Firebase Authentication. You can use the Firebase Admin SDK to manage your users or authentication tokens. There are several reasons why we recommend doing so:

You can integrate an external user system with Firebase. For example, if you have a user database or want to integrate the system with a third-party identity provider that is not natively supported by Firebase Authentication.

To do this, you can create custom tokens with arbitrary claims that identify the user. These custom tokens can be used to access the Firebase Authentication service in a client application and adopt the identity described in the token claims.

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However, you can also use the service to identify those users on your own server. This allows you to perform logical tasks on the server securely on behalf of users who have logged in with Firebase Authentication.

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This makes it possible to implement various access control strategies, such as role-based access control, in Firebase apps. These custom attributes can grant users different levels of access (roles) that are enforced by the application’s security rules.

The code examples and solutions described on this page correspond to the client-side Firebase Auth APIs and the server-side Auth APIs provided by the Admin SDK.

After new claims are modified on a user via the Admin SDK, they are propagated to an authenticated user on the client-side via the ID token in the following ways:

Custom claims can be added with Cloud Functions and propagated immediately with Realtime Database. The function is called only during registration with an onCreate trigger. Once custom claims are established, they are propagated to all existing and future sessions. The next time the user logs in with the user credential, the token will contain the custom claims.

Firebaseauth

Authentication identifies the users requesting access to your data and provides that information as a variable that you can leverage in your rules. The auth variable contains the following information:

You can leverage this in your rules if, for example, you want to limit read access to authenticated users: auth != null. However, we generally recommend limiting write access more.

For example, your app may make sure that users can only read and write their own data. In this situation, you must define a match between the auth.uid variable and the user ID in the requested data:

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For example, suppose you want to create an “admin” function that enables write access on certain paths. You would have to assign that attribute to users, and then benefit from them in the rules that grant access to those paths.

You can add a custom field to users’ documents in Cloud Firestore and retrieve the value of that field with a read built into your rules. In this way, your administration-based rule will look like this: