Azure AD SSO for Firebase Apps: Complete Implementation
Blog post from SSOJet
Microsoft Entra ID processes billions of authentications daily, and enterprise clients increasingly prefer using single sign-on (SSO) rather than maintaining separate passwords for different applications, such as Firebase apps. To accommodate this, without migrating off Firebase, developers can implement an SSO broker like SSOJet, which manages the connection to Microsoft Entra ID and exchanges it for a Firebase custom token. This approach allows existing Firebase session logic to remain unchanged while enabling authentication through enterprise identity providers. The SSOJet overlay pattern maintains Firebase's existing setup, handling the Microsoft Entra ID connection and facilitating the creation of Firebase sessions with custom tokens. This method bypasses the need for upgrading to Firebase Authentication with Identity Platform, which requires managing identity providers individually and changes the billing model. Instead, SSOJet provides a self-serve admin portal for enterprise customers to configure their own Entra ID tenants, simplifying the onboarding process for B2B SaaS applications. Developers can implement this solution in a React + Firebase app by registering SSOJet as an OpenID provider, using React to initiate SSO redirects, and exchanging codes for Firebase custom tokens, ensuring seamless integration without altering existing Firestore rules or session management.
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