White Paper: Implementing MSAL-based Single Sign-On (SSO) with Device Token Integration in React Native Expo Mobile App

Abstract
This white paper presents a comprehensive guide to implementing Single Sign-On (SSO) in a React Native application (EZ Thanks in our case) using the Microsoft Authentication Library (MSAL). It includes the integration of device tokens for enhancing security and compliance with Azure Active Directory (Azure AD) policies.
Table of Contents
Introduction
Prerequisites
Azure AD Configuration
Registering the Application
Configuring Redirect URIs
Setting API Permissions
- React Native Integration
Installing Required Libraries
Configuring MSAL
Implementing Authentication
- Device Token Integration
Understanding Device Code Flow
Implementing Device Code Flow
Conclusion
References
1. Introduction
With the rise of needs in EZ Thanks app clients demanding for the SSO login, and with Microsoft Azure introducing MSAL based with advanced device token added authentication, secure authentication has become a critical component of application development. MSAL provides a robust framework for implementing authentication in applications using Azure AD. This white paper elaborates on integrating MSAL in our EZ Thanks React Native app and incorporating device tokens for enhanced security.
2. Prerequisites
Azure Active Directory Tenant: An Azure AD tenant is required to register and manage the application.
Development Environment: Node.js, React Native CLI, and a React Native project set up.
MSAL Library: The react-native-msal library for handling authentication in React Native.
3. Azure AD Configuration
Registering the Application
Navigate to the Azure portal.
Go to "Azure Active Directory" > "App registrations" > "New registration".
Enter the application details and register the app.
Note the Application (client) ID and Directory (tenant) ID.
Configuring Redirect URIs
In your app registration, go to "Authentication".
Add a redirect URI in the format msal<your-client-id>://auth.
Setting API Permissions
In your app registration, go to "API permissions".
Add permissions such as User.Read for basic user data access.
Flow diagram of how the Device token-based authentication works in mobile apps.
4. React Native Integration
Installing Required Libraries
Install the react-native-msal library:
npm install react-native-msal
Configuring MSAL
Create a configuration file (e.g., msalConfig.js):
export const msalConfig = {
auth: {
clientId: 'YOUR_CLIENT_ID',
authority: 'https://login.microsoftonline.com/YOUR_TENANT_ID',
redirectUri: 'msalYOUR_CLIENT_ID://auth',
},
cache: {
cacheLocation: 'localStorage',
storeAuthStateInCookie: false,
},
};
Implementing Authentication
App.js:
import React from 'react';
import { MSALProvider } from 'react-native-msal';
import { msalConfig } from './msalConfig';
import YourComponent from './YourComponent';
const App = () => {
return (
<MSALProvider config={msalConfig}>
<YourComponent />
</MSALProvider>
);
};
export default App;
YourComponent.js:
import React from 'react';
import { Button, View } from 'react-native';
import { useMSAL } from 'react-native-msal';
const YourComponent = () => {
const { instance, accounts } = useMSAL();
const login = async () => {
try {
const loginResponse = await instance.loginPopup({
scopes: ['User.Read'],
});
console.log('Login Response:', loginResponse);
} catch (error) {
console.error('Login Error:', error);
}
};
const getToken = async () => {
try {
const request = {
scopes: ['User.Read'],
account: accounts[0],
};
const tokenResponse = await instance.acquireTokenSilent(request);
console.log('Token Response:', tokenResponse);
} catch (error) {
console.error('Token Error:', error);
}
};
return (
<View>
<Button title="Login" onPress={login} />
<Button title="Get Token" onPress={getToken} />
</View>
);
};
export default YourComponent;
5. Device Token Integration
Understanding Device Code Flow
Device Code Flow allows users to authenticate on devices with limited input capabilities by using a secondary device. It is useful for scenarios where traditional interactive authentication is not feasible.
Implementing Device Code Flow
YourComponent.js:
import React, { useState } from 'react';
import { Button, View, Text } from 'react-native';
import { PublicClientApplication } from 'react-native-msal';
import { msalConfig } from './msalConfig';
const YourComponent = () => {
const [message, setMessage] = useState('');
const pca = new PublicClientApplication(msalConfig);
const deviceCodeRequest = {
scopes: ['User.Read'],
deviceCodeCallback: (response) => setMessage(response.message),
};
const loginWithDeviceCode = async () => {
try {
const response = await pca.acquireTokenByDeviceCode(deviceCodeRequest);
console.log('Device Code Response:', response);
} catch (error) {
console.error('Device Code Error:', error);
}
};
return (
<View>
<Button title="Login with Device Code" onPress={loginWithDeviceCode} />
{message && <Text>{message}</Text>}
</View>
);
};
export default YourComponent;
6. Conclusion
This white paper outlines the integration of MSAL-based SSO in a React Native application with the addition of device token functionality. By following these steps, developers can ensure secure and seamless authentication experiences in their mobile applications, meeting the requirements of modern security standards and compliance.
7. References
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