AuthenticationProxyfortheVistAHospitalInformationSystem.pptVIP

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2017-03-13 发布于湖北
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AuthenticationProxyfortheVistAHospitalInformationSystem.ppt

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AuthenticationProxyfortheVistAHospitalInformationSystem

Authentication Proxy for the VistA Hospital Information System William Majurski Information Technology Laboratory Department of Veterans Affairs Hospital System Serves medical needs of veterans 170+ medical centers 400+ outpatient locations Organized by region VistA Veterans Health Information Systems and Technology Architecture DHCP (Decentralized Hospital Computer Program) Server written in M (MUMPS) Timesharing Client/Server Administration - site/region Installed NT Network Currently supports administrative functions Uses NT Domain Model Domain Controller Centralized administration Basic Client/Server Problem Statement User population more mobile Providers patients dealing with more than one site VistA network of computing services becoming more tightly integrated. Current authentication scheme (userid/password) poses problems. Problem Statement (cont.) Each user must have account on each system associated with his patients. Must remember account names passwords. Repeated authentication is time consuming and distracting. Approach Authentication Proxy Network service that bridges security environments of Underlying network environment (NT) Hospital information system Solves Multiple account Repeated Authentication problems. Approach Specifics Authentication Proxy that translates NT authentication into VistA authentication Map NT user identity - VistA user identity Automatically creating map Event log NT Authentication NT Domain Collection of workstations and servers Identified by domain name managed from single administrator’s account User login To domain Servers trust domain controller Servers can identify user account Critical Technology Security Support Provider Interface (SSPI) API to integrated security services Accessibility: direct calls to API RPC Distributed Common Object Model (DCOM) Authentication Proxy Runs on server running NT Talk SSPI to client via DCOM Tightly coupled with M Server Architecture Userid/Password Authenticate with Proxy User Ma