Cross-Enterprise User Assertion (XUA) Profile

Introduction

This is a draft of the Cross-Enterprise User Assertion Profile (XUA) supplement to the ITI Technical Framework. This draft is a work in progress, not the official supplement or profile.

Profile Abstract

The Cross-Enterprise User Assertion Profile (XUA) provides the user identity in transactions that cross enterprise boundaries. Enterprises may choose to have their own user directory and their own unique method of authenticating the users, they may even choose to use a third party. To provide accountability in these cross enterprise transactions there is a need to identify the requesting user in a way that the receiver can make access decisions and proper audit entries.

Glossary

XUA

Cross-Enterprise User Assertion (Formerly Cross-Enterprise User Authentication)

Issue Log

See Cross-Enterprise User Assertion - Discussion

Volume I

Add the following bullet to the list of profiles

• Cross-Enterprise User Assertion - provides the user identity in transactions that cross enterprise boundaries. Enterprises may choose to have their own user directory and their own unique method of authenticating the users, they may even choose to use a third party. To provide accountability in these cross enterprise transactions there is a need to identify the requesting user in a way that the receiver can make access decisions and proper audit entries.

Dependencies

Add the following row(s) to the list of dependencies

Integration Profile	Dependency	Dependency Type	Purpose
Cross-Enterprise User Assertion

Profile Name

The Cross-Enterprise User Assertion Profile (XUA) provides a trustable user identity for transactions that cross enterprise boundaries. The user identities may be centrally managed, or distributed.

There are transactions defined by IHE that cross enterprise boundaries. The existing IHE mechanisms to provide an authenticated user identity (EUA) will not function in cross-enterprise transactions. Further in a cross-enterprise environment it is more likely that the transactions will be going between two enterprises that maintain their own independent user directories (PWP). This problem is the same focus of the OASIS-SAML standard. This standard has received much attention and support by the security and the platforms industry. This standard allows for centralized user directory, but also supports the more powerful federation of user directories. This standard supports many methods of user authentication (password, biometrics, smartcard) and can include details about the method(s) used.

The solution proposed is to leverage SAML and the various profiles from W3C, OASIS, and WS-I. In this way we will be able to take advantage of the vast experience of the communities outside of healthcare standards. This profile will be leveraging the experience of a few programs around the globe that have started work with SAML in healthcare. Most of these projects are applying SAML to XDS as we expect to be doing in the first year.

Discussion about the creation of this profile can be found at Cross-Enterprise User Assertion - Discussion

Use Cases

This profile will likely take two years to fully fill out. In the first year we will be focusing only on the consumption side of XDS, specifically the Registry Stored Query and Retrieve Document transactions. The motivator for this is that these are the most exposed transactions that IHE has defined; their use is expected to be from a wide variety of consuming applications and enterprises.

1. General practice doctor retrieving results of a test performed by an outpatient clinic.
2. Outpatient clinic retrieving request to perform a test and background information necessary.
3. Doctor in an emergency situation request to retrieve documents (that would under normal conditions would not be accessible)
   1. Where the privacy consent (BPPC) has restricted access
4. System, based on a scheduled procedure, pre-fetches the available documents so that it can determine a relevant few documents to offer to the doctor when the patient arrives.
5. Patient, using a PHR like application, accesses their own information in XDS.
6. Access of a document by an individual that can’t be identified because the SAML-IDP (X-Assertion Provider) is not accessible

Actors/Transaction

File:At.jpg

Cross-Enterprise User Assertion Actor Diagram

Cross-Enterprise User Assertion Actors and Transactions

Actor	Transaction	Opt.	Section
Actor 1	Transaction 1	R	#Transaction 1

Options

{{{1}}} Options

Actor	Option	Section
Actor 1	Option 1	#Option 1

Option 1

A description of option 1.

Process Flow

Cross-Enterprise User Assertion Process Flow

More text about process flow

Actor Definitions

• X-Assertion Provider – This is a SAML Identity Provider (IDP), and is not further specified by IHE.
• X-Service User – This is the system making a web-services request. In the first year this is the XDS-Document Consumer Actor.
• X-Service Provider – This is the system providing the web-service. In the first year this is the XDS-Document Registry and XDS-Document Repository Actors.

Transaction Definitions

Transaction

Definition

Volume II

Transaction 1

Use Case Roles

[[image:ucr.jpr|frame|center]

Actor

Actor 1

Role

Role of Actor 1

lather, rise and repeat for each actor

Referenced Standards

Normative -- required to use this profile

• SAML V2.0 Standards http://www.oasis-open.org/committees/security/.
  • SAMLCore SAML V2.0 Core standard
  • WSS Web Services Security V1.1 including errata
  • WSS SAML Web Services Security SAML Token Profile V1.1 including errata

Informative -- assist with understanding or implementing this profile

• IHE Profiles
  • Personnel White Pages Profile
  • Enterprise User Authentication Profile
  • Basic Patient Privacy Consents Profile
• SAML V2.0 Standards http://www.oasis-open.org/committees/security/.
  • SAMLTechOvw SAML V2.0 Technical Overview (a work in progress currently at revision 10)
  • SAML Tutorial presentation by Eve Maler of Sun Microsystems
  • SAML Metadata Version 2.0
• WS-I
  • WS-I Conformance Claim
  • WS-I Basic Security Profile Version 1.1 (Doesn't use SAML 2.0)
  • WS-I Basic Profile Version 1.2 (Doesn't use SOAP 1.2)
• W3C
  • WS-Policy Version 1.2
  • SOAP Version 1.2
• ISO
  • ISO/TS 21091 Health informatics — Directory services for security, communications and identification of professionals and patients
  • ISO 17090 Health informatics - Digital Certificates in Healthcare
  • ISO/DTS 21298 Functional and Structural Roles from (work item in committee)
• CEN
  • CEN 13606-4 (makes normative ISO 21298 role vocabulary?)

Interaction Diagram

File:Int.jpg