authorization wg update david kelsey eu grid pma, copenhagen 27 may 2008

Authorization WGUpdate

David KelseyEU Grid PMA, Copenhagen

27 May 2008

27 May 08 EU Grid PMA, Kelsey 2

Mandate• EUGridPMA Working Group on Policy Management

for Grid Authorisation– Mandate and aims

• To prepare recommendations on policy and global trust issues related to Grid Authorisation (AuthZ)

• The initial list of issues will include: – Minimum requirements and best practice for the

operation of a Grid AuthZ attribute authority– Minimum requirements and best practice for Virtual

Organisation user and service membership management– Accreditation of Attribute Authorities (AA)– Accreditation of Virtual Organisations and their

membership management procedures

Mandate (2)– Repositories and distribution of

accredited AA roots of trust– Technical details of attribute signing

and trust validation• To recommend how IGTF could handle the

definition of AuthZ policy and related accreditation during the next 3 to 5 years, taking into account the move towards a sustainable EU Grid Infrastructure and constituent national Grids


Mailing list members• M Altunay• J Basney• V Ciaschini• R Cowles• G Garzoglio• D Groep• M Helm• E Imamagic• J Jensen• C Kanellopoulos

• D Kelsey• O Koeroo• D Kouril• A McNab• D O’Callaghan• M Sova• Y Tanaka• C Triantafyllidis• W Weisz• J Wolfrat


Discussion on mandate• Several suggestions received• First mandate for this WG should be to set up a list of all

known AuthZ tools for the Grid environment available and in development– To determine actual and near future best practice

• Especially it should help to discern advantages and disadvantages of SAML assertions versus Attribute certificates versus attributes directly included in proxy certificates.

• This could guide us in the more theoretical aspects of the WG work.


Discussion (2)• Policy implications for VOs and VO

service providers are essentially the same whatever signing and attribute/assertion technology is used

• Perhaps there is scope for an AAOPS in OGF?– need for implementations that work, as

opposed to blue sky protocol design


Discussion (3)• I agree that we may start with working on

VOMS; however, staying implementation-independent, as much as possible, would help us in the long run

• How LoA of the underlying AuC assertions affect what AuZ can do– This leads to a sort of risk assessment framework– If I have a precious resource, I need high quality

AuC assertions underneath it.


Policy models• Attribute Authority Service Profile

– Based on VOMS• Can we make it technology independent?

– This should be written

• VO procedures– JSPG working on two documents

• VO Registration Policy• VO Membership Management Policy

– Probably don’t need another one!


Scaling issues• Today in EGEE

– ~200 VOs (mix of global, international, regional, national, local)

– # VOMS servers (how many?)• Need to quantify

• Future EGI/NGI world– ~35 to 40 Grids in Europe

• EU Grid PMA– Accredits ~2 per meeting and reviews ~4


Accreditation

• Options– Existing IGTF PMAs– Form new AuthZ PMAs– Large Grids (EGEE, OSG etc)– NGIs– Or mix of some/all of these


Accreditation (2)• My personal preferences (not discussed yet)• IGTF defines the standards• Others do accreditation

– With IGTF members– Important to have feedback into standards

• Large Grids or Coordination (call it EGI)– Accredit Global VOs– And run AA services for them

• Accredited by IGTF


Accreditation (3)• Every VO should have a home Grid

– Runs the AA services• NGI AA service is accredited by IGTF or EGI

– Accredits the VO procedures

• Bootstrap– Prepare draft profiles (AA and VO)– Accredit a small number of global VOs– Feedback and improve profiles


AC validation

• Document from OSG• Attribute Certificate Validation in

OSG– Mike H to say more?


Meetings and plans

• Work should start on the draft AA profile– Needs a small team– Then wider discussion

• I propose to hold a workshop– Early autumn– EGEE’08?– Joint with EU Grid PMA Lisbon meeting?


Discussion


authorization wg update david kelsey eu grid pma, copenhagen 27 may 2008

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