How to Add Enterprise SSO to a Multi-Tenant SaaS Application

The process of integrating enterprise Single Sign-On (SSO) into a multi-tenant Software as a Service (SaaS) application is complex, as it involves configuring and validating identity provider (IdP) connections for each tenant, which can take months of engineering time for many vendors. This challenge stems from the need to support multiple IdPs like Okta, Microsoft Entra ID, and Google Workspace, and to handle different authentication protocols such as SAML 2.0 and OIDC. The key to successful multi-tenant SSO is tenant discovery, ensuring that login requests are correctly mapped and routed to the appropriate tenant's IdP without relying on the assertion itself to determine tenant identity. Utilizing a broker API like SSOJet can significantly streamline the process by collapsing per-IdP work into a single integration point, thus reducing setup time and minimizing the security risks associated with manual configuration. The implementation should include just-in-time provisioning for user creation and SCIM 2.0 for synchronization, ensuring accurate and timely user deprovisioning. Proper assertion validation and tenant isolation are crucial to preventing cross-tenant account takeovers, a critical focus during enterprise security reviews.

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