Web Services Tiered Internet Authorization (WSTIERIA)
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Web Services Tiered Internet Authorization (WSTIERIA)

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Presented by Fiona Culloch at AIM End of Programme meeting, Birmingham, 21/06/2011

Presented by Fiona Culloch at AIM End of Programme meeting, Birmingham, 21/06/2011

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Web Services Tiered Internet Authorization (WSTIERIA) Web Services Tiered Internet Authorization (WSTIERIA) Presentation Transcript

  • Web Services Tiered Internet Authorization (WSTIERIA) 21 June 2011 Fiona Culloch [email_address]
  • Output 1: Digimap changes
    • Modified production Digimap service
      • To give non-browser GIS clients (ArcView etc.)
        • Access to Digimap data via web services
        • Using OGC standards (Web Map Service etc.)
        • UK federation authentication of registered users, with SSO
        • As alternative to large downloads of raw data
  • Output 2: DIY instructions
    • Short document (7 pages) on “how-to”
      • Control access to existing web services
      • From non-browser clients
      • Without modifying the web service
      • Implementable by average sysadmin
      • Using only off-the-shelf software
        • Apache web server (with mod_rewrite)
        • A little scripting (perl, or anything else)
  • Output 3: Try Shibboleth delegation
    • Set up dev & test environment
      • PM1: Eclipse + Maven2
      • VM1: IdP + delegation plugin
      • VM2: example client (JSP) + Shib SP1 + JASIG delegation library
      • PM2: example web service (WSP) + Shib SP2
    • “ Hello, world”-level success!
      • User goes to JSP/SP1, logs in at IdP
      • JSP calls JASIG library to GET from WSP/SP2
      • Lib accesses SP2 using delegatable token from IdP; user does not need to log in to SP2
  • Successes
    • Production service (Digimap) using UK fed. for non-browser web services
    • Route to interoperation of unmodified web services, unmodified non-browser clients with UK federation
    • Demonstrated deployability of new Shibboleth delegation software by developer outside the Shibboleth team
  • Lesson 1: Delegation limitations
    • Delegation depends on IdP & all SPs
      • Supporting SAML2, bits of Liberty
      • SP implementation (Shibboleth 2.2+)
    • IdP deployer must explicitly name:
      • SP entities allowed to delegate
      • SP entities they can delegate to, etc, etc.
    • Probably rules out cross-organisational scenarios for now, leaving
      • Intra-org applications (e.g. student portal)
  • Lesson 2: uPortal not needed
    • Original delegation use case was uPortal web app invoking portlets
    • Wasn’t known if delegation library depended on this uPortal context
    • Project showed how a non-uPortal web app (JSP) can use delegation library
  • Lesson 3: Delegation & UK federation
    • Potential issue identified
      • UK federation (& others, e.g. InCommon) moving from CAs to self-signed trust-fabric certs
      • Delegation library rejects these because not in std. Java CA trust list
      • Reported to developer (Unicon), response awaited
  • Failures
    • No deployments outside EDINA
    • No future external partner identified
    • Attempt to apply the simple Apache + scripting technique to WebDAV
      • Limited success (only easy cases worked)
      • Protocol with server URLs in data & headers defeats simple technique
      • Wrote up experience as tech note
  • Future
    • Shibboleth developers
      • Migrate delegation library into SP code?
      • IdP config optionally take delegation audiences (SP2,…,n) from SP1 metadata
    • EDINA
      • More interesting examples (INSPIRE?)
    • Community
      • Apply techniques!