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SEcurE access to GEOspatial services OGC-OGF Collaboration workshop Open Grid Forum 22 (OGF22) February, 2007 Chris Higgins (EDINA, University of Edinburgh)

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Presentation on theme: "SEcurE access to GEOspatial services OGC-OGF Collaboration workshop Open Grid Forum 22 (OGF22) February, 2007 Chris Higgins (EDINA, University of Edinburgh)"— Presentation transcript:

1 SEcurE access to GEOspatial services OGC-OGF Collaboration workshop Open Grid Forum 22 (OGF22) February, 2007 Chris Higgins (EDINA, University of Edinburgh)

2 A National Data Centre for Tertiary Education since 1995, based at the University of Edinburgh Our mission... to enhance the productivity of research, learning and teaching in UK higher and further education Focus is on services but also undertake r&D –turn projects services Substantial experience in handling geospatial data EDINA National Data Centre

3 Lots of users, eg, ~30000 students registered for our Ordnance Survey service. Need to be able to scale: –SOA comprised mainly of OGC Web Services for use in the academic sector: an academic Spatial Data Infrastructure –high load; dont want to restrict services and cant afford to buy endless hardware (that sits unused most of the time) Supporting eResearch. Grid characteristics and goals (Technical Strategy OGF ): –infrastructure virtualisation –resource pooling and sharing –self monitoring/improvement –dynamic resource provisioning –highest Quality of Service Why interested in Grid?

4 JISC (Joint Information Systems Committee) Programme Funded by the UK HFE funding councils Supports teaching, learning, research and administration Provides strategic guidance to UK HFE on use of ICT Grid OGC Collision in context of wider UK e- infrastructure …embraces networks, grids, data centres and collaborative environments, and can include supporting operations centres, service registries, single-sign on, certificate authorities, training and help-desk services. Most importantly, it is the integration of these that defines e-Infrastructure. Grid OGC Collision Programme

5 Aiming to demonstrate how access to GI on Grid may be achieved: Shibboleth WS-Security GSI OGC Web Services Partners: EDINA, NeSC, NCeSS, MIMAS Main deliverables are a report and a number of demonstrators: National datacentre e-Social Science Orchestration Would welcome your input on next demonstrator SEcurE access to GEOspatial services

6 #1 Ordnance Survey MasterMap UK National Topographic Database 400+ million features Encoded in Geography Markup Language (GML) EDINA uses Web Feature Servers (WFS) within our architecture – service launched Sept 2007 We want to make WFS directly available

7 OWS Client Authentication Service Gatekeeper (Enforcement) OWS Service License Manager (Administration) License Broker conditions Identity Provider Authorization Service (Decision) OWS Client GeoDRM Client OWS-4 GeoDRM Architecture End-User Consumer DeliverymanManager Broker Reference: GeoDRM Engineering Viewpoint Elfers, Wagner OGC meeting San Diego, GeoDRM WG

8 Gatekeeper is transparent; extension for OGC W*S –Adds GeoDRM functionality and information (e.g. capabilities) –Accepts identity and/or license tokens with the W*S payload Authentication Service –Provides identity tokens for in-band authentication –Authentication Service could be used as central service in a federation Authentication and retrieval of user information Single-Sign-On and Single-Log-Out Support different authentication methodologies (harmonization) Authorization Service is responsible for all authorization and validity checks –Integrity, authenticity and origin of messages, signatures, etc. –Authorization based on local rights (classical access control) as well as on-the-fly resolved rights from licenses

9 License Broker negotiates Licenses with the Client –Different types of Offerings; those define the further negotiation- workflows –On agreement: Broker stores License in License Manager, Client receives a Reference Token License Manager manages Licenses (surprise!) –License are fetched by the AuthZ-Service using the reference –Manager could be used as central service in a federation Storage in Federation Global License Revoke (similar to single-log-out)

10 AuthN: Shibboleth 1. User attempts to access a Shibboleth- protected resource on the SP site. 2.,3. User is redirected to the WAYF in order to select home organisation (IdP). 4. IdP ensures that user is authenticated, by whatever means IdP deems appropriate. 5. After successful authentication, a one- time handle (session identifier) is generated for this user session. 6. SP uses the handle to request attribute information from the IdP for this user. 7. IdP allows or denies attribute information to be made available to this SP using the Attribute Release policy. 8. Based on the attribute information made available, SP allows or denies the user access to the resource. User Where are you from (WAYF) Identity Provider (IdP) Service Provider (SP)

11 Mission: provide coherent electronic access for UK researchers to all computational and data based resources and facilities required to carry out their research, independent of resource or researcher location Largest National Grid Initiative outside US Claims to have the largest grid PKI infrastructure Approx 500 registered users (April 2007) Predominantly focussed on compute and storage at present Content = Services; data, computation,...NGS will only grow if the content grows Limited data sets available Exploring use of their facilities for hosting MasterMap UK National Grid Service

12 #2 the SEE-GEO eSocSci exemplar Refactored as Web Processing Service

13 OGSA-DAI activities, a simple pipeline, eg, GDAS getData, GLS geoLink, WFS getFeature Additional GLS implementations simplified if activities already exist (multiple different ways to implement GLS) We can now do the following with relatively little extra work: Choose different framework datasets dynamically Merge GDAS XML directly into an RDBMS dataset Implement filters, eg, bbox, currently must use geolinkage field values (geolinkids) Transfer data using GridFTP Protect using Grid Security Infrastructure (GSI) Feature based data processing and OGSA-DAI as a toolkit for building additional WPS. OGSA-DAI WPS implementation

14 Security at the moment Authenticate here IP restrict services to OGSA-DAI server IP restrict WPS to application server

15 Some security options/considerations Workflow Use Cases vital Different service, different licence Requirement for secondary authentication Other possible security options include: 1.Use GSI 2.Web services as in #1 Must avoid solutions that do not scale easily Need consensus Need to be closer to production services and not research

16 #3 Distributed Federations European Persistent Geospatial Testbed for Research and Education Collaboration AGILE, EuroSDR and OGC Aims: research test-bed for collaborative European research in geospatial interoperability aid the assessment of the current standards for geospatial interoperability in terms of research compatibility, completeness, consistency and ease of use and extensibilit an environment for teaching standards and techniques for geospatial interoperability a resource to AGILE/EuroSDR/OGC for the coordination of research requirements as well as definition, testing, validation and development of open standards


18 End Questions? Chris Higgins (EDINA, University of Edinburgh)

19 EDINA National Data Centre

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