ISC2 Certified Cloud Security Professional (CCSP) Practice Question
Your organization is launching a multi-tenant SaaS platform on a public cloud. Each customer insists that its employees sign in with the credentials already stored in the customer's corporate directory. The SaaS provider should not store or synchronize end-user passwords but must still control role-based authorization inside the application. Which identity management approach best satisfies these requirements while minimizing administrative overhead for both the SaaS provider and its customers?
Establish LDAP directory replication from every customer environment into the SaaS vendor's central directory service.
Implement SAML 2.0 federation so the SaaS acts as a Service Provider that trusts each customer's external IdP for authentication.
Distribute unique API keys to every customer user and validate the keys within application code.
Configure the SaaS to operate as the customers' Identity Provider and issue new credentials for each tenant.
Configuring the SaaS application to act as a SAML 2.0 Service Provider (SP) and trusting each customer's existing identity provider establishes a federation. In this model, authentication happens against the customer-managed IdP, so the SaaS vendor never stores or replicates user passwords. The IdP issues signed assertions that the SaaS (as SP) consumes to create sessions and map users to roles held within the application. Maintaining separate SaaS-issued credentials or replicating LDAP directories would violate the requirement to avoid storing passwords and would add significant lifecycle management overhead. API keys provide application access control but do not supply user identity or SSO and cannot leverage customers' existing authentication workflows.
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ISC2 Certified Cloud Security Professional (CCSP)
Cloud Application Security
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