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Fedcloud-tf:WorkGroups: Federated AAI

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Main Roadmap and Innovation Technology For Users For Resource Providers Media


Workbenches: Open issues
Scenario 1
VM Management
Scenario 2
Data Management
Scenario 3
Information Systems
Scenario 4
Accounting
Scenario 5
Monitoring
Scenario 6
Notification
Scenario 7
Federated AAI
Scenario 8
VM Image Management
Scenario 9
Brokering
Scenario 10
Contextualisation
Scenario 11
Security



Integrating authentication and authorisation across multiple resource providers

Leader: Bjoern Hagemeier, FZJ

Collaborators

Role Institution Name
Scenario leader FZJ Bjoern Hagemeier
Collaborator CESNET Dan Kouřil
Collaborator OeRC Matteo Turilli

Scope

We have already defined that user authentication should be based on X.509 certificates rather than usernames and passwords or other credential material. Nevertheless, depending on the type of federation intended, this may not even be a real requirement. Any service should rely on an identity provider and

Degrees of Freedom

Type of Federation

Thank you David W. for mentioning the difference in the information publishing document.

Before taking any decision about the requirements for a federated AAI, one needs to be sure what type of federation is desired. There are roughly two types that need to be considered, which have a strong influence on how to authenticate and authorize users.

Tight federation

The federated cloud systems are all the same for the user. He only interacts with a single point of entry. Consequently, there can (and probably should) be a single user database.


Loose federation

Every user has a home organization at which he can be authenticated (identity provider). Every service within the federation 'knows' a list of acceptable identity providers.

VO support

What's already there?

Standards

SAML

" Security Assertion Markup Language (SAML) is an XML-based open standard for exchanging authentication and authorization data between security domains, that is, between an identity provider (a producer of assertions) and a service provider (a consumer of assertions)."


OAuth

"OAuth (Open Authorization) is an open standard for authorization. It allows users to share their private resources (e.g., photos, videos, contact lists) stored on one site with another site without having to hand out their credentials, typically username and password.

...

OAuth is a service that is complementary to, but distinct from, OpenID."

x.509 Certificates

incl. Proxies

OpenID

OpenID is an open standard that describes how users can be authenticated in a decentralized manner, eliminating the need for services to provide their own ad hoc systems and allowing users to consolidate their digital identities. Users may create accounts with their preferred OpenID identity providers, and then use those accounts as the basis for signing on to any website which accepts OpenID authentication. The OpenID standard provides a framework for the communication that must take place between the identity provider and the OpenID acceptor (the ‘relying party’). An extension to the standard (the OpenID Attribute Exchange) facilitates the transfer of user attributes, such as name and gender, from the OpenID identity provider to the relying party (each relying party may request a different set of attributes, depending on its requirements).

AAI Products

Shibboleth

The Shibboleth System is a standards based, open source software package for web single sign-on across or within organizational boundaries. It allows sites to make informed authorization decisions for individual access of protected online resources in a privacy-preserving manner.

UVOS

UNICORE VO Service (UVOS) is a client-server system, developed to be used as an additional tool for large distributed systems. Grid systems, especially UNICORE grid middleware, are the mainspring of the UVOS system. Although UVOS can be used with different systems, however is designed primarly to support UNICORE grid middleware.

VOMS

VOMS is a system for managing authorization data within multi-institutional collaborations. VOMS provides a database of user roles and capabilities and a set of tools for accessing and manipulating the database and using the database contents to generate Grid credentials for users when needed.

Cloud Product Support

One of the key factory influencing the choice of AAI will be the support in the already deployed Cloud products in the Testbed. Most likely, support will not be directly available. But where it is, it will be valuable. Most probably, we will have to evaluate the effort required to integrate AA support into the products.

OpenStack

Towards the end of 2010, OpenStack started their authn initiative to consolidate the various mechanisms available in the different components of OpenStack. The goal of this initiative was "to define a standard for authentication in OpenStack that enables services to support multiple authentication protocols in a pluggable manner".

Starting with its Diablo release, "Keystone is the identity service used by OpenStack for authentication (authN) and high-level authorization (authZ). It currently supports token-based authN and user-service authorization. It is scalable to include oAuth, SAML and openID in future versions.

Whereas in the Diablo release Keystone is an add-on component, the following Essex release provides Keystone as a core component.

OpenNebula

cf. Fedcloud-tf:Blueprint:Capabilities:Authentication and Authorisation#OpenNebula

Infrastructure

EGI SSO
  • What does it use?
  • Possible integration?

Liaisons