Protect your backends with Firebase App Check

A powerful layer of security for your backend infrastructure that helps protect access to your services by attesting that incoming traffic is coming from your app, and blocking traffic that doesn't have valid credentials. It helps protect your backend from abuse, such as billing fraud, phishing, app impersonation, and data poisoning.

1. Bangkok Protect your backends with Firebase App Check Jirawat Karanwittayakarn Google Developer Expert in Firebase
2. Release and Monitor Crashlytics Performance Monitoring Test Lab Engage In-App Messaging Predictions Cloud Messaging Remote Config A/B Testing Dynamic Links Build Auth Cloud Functions Cloud Firestore Cloud Storage Hosting Realtime Database
3. Firebase Security
5. User Data + Security Rules Firebase Auth Firebase Security
7. Firebase App Check
8. Firebase Google Cloud API Endpoints
11. Firebase Resources Cloud Firestore Cloud Storage for Firebase Realtime Database Cloud Functions for Firebase
12. App Check Attestation Providers
13. Attestation Providers SafetyNet Device Check reCAPTCHA V3 Custom Attestation New App Attest reCAPTCHA Enterprise New Play Integrity New reCAPTCHA V3 SafetyNet Device Check
14. Only supported on iOS 14+ Device Check App Attest And/Or?
15. To support prior versions to iOS 11, use custom attestation. Device Check Supported on iOS 11+ Only supported on iOS 14+ App Attest And
16. App Check Token and TTL
17. SafetyNet App Check App Attestation Cloud Firestore App Check Resource Access
18. App Check Backend Issues App Check token with TTL in Attestation flow App Check token grants access to Firestore while TTL is valid
19. App Check Backend App Check token exceeds TTL Re-perform Attestation flow to keep valid App Check token Issues App Check token with TTL in Attestation flow
20. App Check Backend Refreshed App Check token with valid TTL Re-perform Attestation flow to keep valid App Check token Issues App Check token with TTL in Attestation flow
21. 30 Min 7 Days Short TTL Long TTL Recommend 1 hr for most apps Custom TTL
22. Custom TTL
23. App Check Enforcement
25. Secure New Apps Before Launch Migrate Existing Apps
26. App Check Service Access User Data + Security Rules Firebase Auth Better together Firebase Security
27. Custom Backend Integration
28. const express = require('express'); const app = express(); const firebaseAdmin = require('firebase-admin'); const firebaseApp = firebaseAdmin.initializeApp(); const appCheckVerification = async (req, res, next) => { // implementation details next slide. } app.get('/yourApiEndpoint', [appCheckVerification], (req, res) => { // Handle request. }); App Check in the Backend Service
29. const appCheckVerification = async (req, res, next) => { const appCheckToken = req.header('X-Firebase-AppCheck'); if (!appCheckToken) { res.status(401); return next('Unauthorized'); } try { const appCheckClaims = await firebaseAdmin.appCheck().verifyToken(appCheckToken); // If verifyToken() succeeds, continue with the next middleware function return next(); } catch (err) { res.status(401); return next('Unauthorized'); } } App Check in the Backend Service
30. const appCheckVerification = async (req, res, next) => { const appCheckToken = req.header('X-Firebase-AppCheck'); if (!appCheckToken) { res.status(401); return next('Unauthorized'); } try { const appCheckClaims = await firebaseAdmin.appCheck().verifyToken(appCheckToken); // If verifyToken() succeeds, continue with the next middleware function return next(); } catch (err) { res.status(401); return next('Unauthorized'); } } App Check in the Backend Service
31. const appCheckVerification = async (req, res, next) => { const appCheckToken = req.header('X-Firebase-AppCheck'); if (!appCheckToken) { res.status(401); return next('Unauthorized'); } try { const appCheckClaims = await firebaseAdmin.appCheck().verifyToken(appCheckToken); // If verifyToken() succeeds, continue with the next middleware function return next(); } catch (err) { res.status(401); return next('Unauthorized'); } } App Check in the Backend Service
32. const appCheckVerification = async (req, res, next) => { const appCheckToken = req.header('X-Firebase-AppCheck'); if (!appCheckToken) { res.status(401); return next('Unauthorized'); } try { const appCheckClaims = await firebaseAdmin.appCheck().verifyToken(appCheckToken); // If verifyToken() succeeds, continue with the next middleware function return next(); } catch (err) { res.status(401); return next('Unauthorized'); } } App Check in the Backend Service
33. x Custom Backend Resources
34. class ApiWithAppCheckExample { interface YourExampleBackendService { @GET("yourExampleEndpoint") fun exampleData( @Header("X-Firebase-AppCheck") appCheckToken: String ): Call<List<String>> } var yourExampleBackendService: YourExampleBackendService = Retrofit.Builder() .baseUrl("https://yourbackend.example.com/") .build() .create(YourExampleBackendService::class.java) fun callApiExample() { FirebaseAppCheck.getInstance().getAppCheckToken(false) .addOnSuccessListener { tokenResponse -> val appCheckToken = tokenResponse.token val apiCall = yourExampleBackendService.exampleData(appCheckToken) // ... } } } Custom Backend for Android
35. class ApiWithAppCheckExample { interface YourExampleBackendService { @GET("yourExampleEndpoint") fun exampleData( @Header("X-Firebase-AppCheck") appCheckToken: String ): Call<List<String>> } var yourExampleBackendService: YourExampleBackendService = Retrofit.Builder() .baseUrl("https://yourbackend.example.com/") .build() .create(YourExampleBackendService::class.java) fun callApiExample() { FirebaseAppCheck.getInstance().getAppCheckToken(false) .addOnSuccessListener { tokenResponse -> val appCheckToken = tokenResponse.token val apiCall = yourExampleBackendService.exampleData(appCheckToken) // ... } } } Custom Backend for Android
36. class ApiWithAppCheckExample { interface YourExampleBackendService { @GET("yourExampleEndpoint") fun exampleData( @Header("X-Firebase-AppCheck") appCheckToken: String ): Call<List<String>> } var yourExampleBackendService: YourExampleBackendService = Retrofit.Builder() .baseUrl("https://yourbackend.example.com/") .build() .create(YourExampleBackendService::class.java) fun callApiExample() { FirebaseAppCheck.getInstance().getAppCheckToken(false) .addOnSuccessListener { tokenResponse -> val appCheckToken = tokenResponse.token val apiCall = yourExampleBackendService.exampleData(appCheckToken) // ... } } } Custom Backend for Android
37. class ApiWithAppCheckExample { interface YourExampleBackendService { @GET("yourExampleEndpoint") fun exampleData( @Header("X-Firebase-AppCheck") appCheckToken: String ): Call<List<String>> } var yourExampleBackendService: YourExampleBackendService = Retrofit.Builder() .baseUrl("https://yourbackend.example.com/") .build() .create(YourExampleBackendService::class.java) fun callApiExample() { FirebaseAppCheck.getInstance().getAppCheckToken(false) .addOnSuccessListener { tokenResponse -> val appCheckToken = tokenResponse.token val apiCall = yourExampleBackendService.exampleData(appCheckToken) // ... } } } Custom Backend for Android
38. x Custom Backend Resources
39. AppCheck.appCheck().token(forcingRefresh: false) { token, error in guard error == nil else { return } guard let token = token else { return } let tokenString = token.token let url = URL(string: "https://yourbackend.example.com/yourApiEndpoint")! var request = URLRequest(url: url) request.httpMethod = "GET" request.setValue(tokenString, forHTTPHeaderField: "X-Firebase-AppCheck") let task = URLSession.shared.dataTask(with: request) { data, response, error in // Handle response from your backend. } task.resume() } Custom Backend for iOS
40. AppCheck.appCheck().token(forcingRefresh: false) { token, error in guard error == nil else { return } guard let token = token else { return } let tokenString = token.token let url = URL(string: "https://yourbackend.example.com/yourApiEndpoint")! var request = URLRequest(url: url) request.httpMethod = "GET" request.setValue(tokenString, forHTTPHeaderField: "X-Firebase-AppCheck") let task = URLSession.shared.dataTask(with: request) { data, response, error in // Handle response from your backend. } task.resume() } Custom Backend for iOS
41. AppCheck.appCheck().token(forcingRefresh: false) { token, error in guard error == nil else { return } guard let token = token else { return } let tokenString = token.token let url = URL(string: "https://yourbackend.example.com/yourApiEndpoint")! var request = URLRequest(url: url) request.httpMethod = "GET" request.setValue(tokenString, forHTTPHeaderField: "X-Firebase-AppCheck") let task = URLSession.shared.dataTask(with: request) { data, response, error in // Handle response from your backend. } task.resume() } Custom Backend for iOS
42. x Custom Backend Resources
43. const callApiWithAppCheckExample = async () => { let appCheckTokenResponse; try { appCheckTokenResponse = await firebase.appCheck().getToken(false); } catch (err) { return; } const apiResponse = await fetch('https://yourbackend.example.com/yourApiEndpoint', { headers: { 'X-Firebase-AppCheck': appCheckTokenResponse.token, } }); // Handle response from your backend. }; Custom Backend for Web
44. const callApiWithAppCheckExample = async () => { let appCheckTokenResponse; try { appCheckTokenResponse = await firebase.appCheck().getToken(false); } catch (err) { return; } const apiResponse = await fetch('https://yourbackend.example.com/yourApiEndpoint', { headers: { 'X-Firebase-AppCheck': appCheckTokenResponse.token, } }); // Handle response from your backend. }; Custom Backend for Web
45. x Custom Backend Resources
46. void callApiExample() async { final appCheckToken = await FirebaseAppCheck.instance.getToken(); if (appCheckToken != null) { final response = await http.get( Uri.parse("https://yourbackend.example.com/yourExampleEndpoint"), headers: {"X-Firebase-AppCheck": appCheckToken}, ); } else { // Error: couldn't get an App Check token. } } Custom Backend for Flutter
47. void callApiExample() async { final appCheckToken = await FirebaseAppCheck.instance.getToken(); if (appCheckToken != null) { final response = await http.get( Uri.parse("https://yourbackend.example.com/yourExampleEndpoint"), headers: {"X-Firebase-AppCheck": appCheckToken}, ); } else { // Error: couldn't get an App Check token. } } Custom Backend for Flutter
48. void callApiExample() async { final appCheckToken = await FirebaseAppCheck.instance.getToken(); if (appCheckToken != null) { final response = await http.get( Uri.parse("https://yourbackend.example.com/yourExampleEndpoint"), headers: {"X-Firebase-AppCheck": appCheckToken}, ); } else { // Error: couldn't get an App Check token. } } Custom Backend for Flutter
49. Apigee Integration
53. Demo
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