Multi-Tenant Identity Management for SaaS: Architecture & Best Practices

According to the Okta Businesses at Work 2024 report, companies now operate an average of 93 SaaS applications, necessitating effective multi-tenant identity management to ensure secure and isolated user experiences for each customer. This architecture pattern enables a single SaaS application to authenticate and authorize users across numerous isolated customer organizations (tenants), each with its own identity provider and role model. The primary goal is to maintain tenant isolation, preventing cross-tenant data leaks, which can result in significant breaches. There are three tenant isolation models—silo, pool, and bridge—each impacting data layout, blast radius, and cost differently. Effective multi-tenant identity management involves complex per-tenant configurations, such as storing identity provider configurations per tenant and ensuring that each tenant has its own SCIM provisioning endpoints, with security maintained by verifying tenant claims at every boundary. Common pitfalls include cross-tenant authorization bugs and incorrect tenant discovery, which can lead to data breaches. To handle these complexities, some companies opt for solutions like SSOJet to manage the technical intricacies of per-tenant identity routing across various identity providers.

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