Enterprise SSO in an iOS App: AppAuth and OIDC, Step by Step

Enterprise SSO for iOS should use the OAuth 2.0 authorization code flow with AppAuth, ASWebAuthenticationSession, PKCE, a registered redirect URI, and secure persistence of OIDAuthState in the Keychain. RFC 8252 classifies native apps as public clients and prohibits embedded user-agents such as WKWebView because the hosting app could capture credentials, manipulate consent, or access session cookies; external browser authentication instead preserves browser SSO state, provides visible URL validation, and limits the app to receiving an authorization code. Redirect schemes must be based on a controlled domain in reverse order, such as com.company.app, while authorization servers must exactly match registered redirect URIs; PKCE protects against code interception risks associated with custom schemes, and implicit flow is discouraged because it lacks PKCE protection. Implementation requires retaining the AppAuth authorization flow until the callback arrives, handling redirects through the appropriate AppDelegate or SceneDelegate method, and re-saving refreshed authorization state. This approach also supports enterprise requirements by keeping passwords outside the app, storing tokens securely, and allowing customer identity providers to apply existing MFA, device compliance, and Conditional Access policies.

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