SMART on FHIR OAuth 2.0: Implementation Guide for Secure EHR Data Access
SMART on FHIR OAuth 2.0: Implementation Guide | Censinet, Inc.
Summary
SMART on FHIR builds upon OAuth 2.0 to provide a standardized framework that securely enables healthcare applications to access Electronic Health Record (EHR) data. It addresses gaps in endpoint discovery and scope management, significantly reducing integration complexity while enhancing security.
Details
SMART on FHIR utilizes OAuth 2.0 for delegated access without sharing credentials. The framework defines two primary connection methods: EHR Launch and Standalone Launch. In an EHR Launch, the app starts within an active EHR session, inheriting context parameters like `iss`. Conversely, a Standalone Launch begins independently, requiring the app to locate the EHR's authorization endpoints during the process. To enhance security and reliability, the guide mandates implementing PKCE (Proof Key for Code Exchange), using short-lived access tokens, and utilizing state parameters for CSRF protection. Dynamic Client Registration Protocol is recommended for onboarding, with confidential clients advised to use asymmetric authentication (private key JWT) instead of shared secrets. Technically, FHIR R4/R4B compatibility is encouraged. For browser-based apps, Cross-Origin Resource Sharing (CORS) and the inclusion of an `aud` parameter are required. The process culminates in the OAuth 2.0 Authorization Code Flow, which securely exchanges access tokens outside the browser environment to establish clinical data access.
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