simon muyal, [email protected] victor reijs, [email protected]

Connect. Communicate. Collaborate

AAI scenario: How AutoBAHN system will use the eduGAIN federation for Authentication and Authorization

Simon Muyal, [email protected] Reijs, [email protected] – TERENA Technical WorkshopLyngby, 20 May 2007

Connect. Communicate. CollaborateAgenda

• AutoBAHN service overview…• Authentication and Authorization Infrastructure…

– Overview– AA Scenario

• Home domain’s User AuthNAutomated & Human user

• Inter-domain AuthR– Policy module and attributes

• Progress…

Connect. Communicate. CollaborateAutoBAHN service overview

• AutoBAHN is a research activity for engineering, automating and streamlining the inter-domain setup of guaranteed capacity (Gbit/s) end-to-end paths

• AutoBAHN = Joint Research Activity 3 of the GN2 project– GN2 is an EC-funded Integrated Infrastructure Initiative (I3) project,

with all NRENs as partners (DANTE: coordinator)– GN2 includes:

• Networking Activities (NAs) (Human networks)• Service Activities (SAs) (deployment of GÉANT2 with focus on

services)• Joint Research Activities (JRAs) (applied technological research)

Connect. Communicate. CollaborateMulti-domain environment

• Multi-technology, multi-disciplinary environment• Control and provisioning has to be distributed• Business-layer related interactions include AA, policies, advance

reservations, etc.• Security and control of intra-domain resources must be safeguarded

Connect. Communicate. CollaborateA distributed approachUser interface

Inter-Domain Manager

Domain Manager

Client equipment IP domain

NMS

GE domain

L2 MPLS VPN

SDH domain

Native Ethernet GFP over SDH

GMPLS signalling

Client equipment

User interface


Domain Manager

User interface


Domain Manager

(1)

(2)

(4)

(5)

(6)

(7)(3)

Inter-domain path-finding

(8)(9)(10)

Home & Source domain

Linking domain Destination domain

Connect. Communicate. CollaborateAutoBAHN processes• Topology updating process

A regular update of the inter-domain abstract topology model

• BoD requestA path request from an automated or human user

• PathfindingFinding a path through the abstract topology model

• Resource scheduling processCheck feasibility of the found path in a chained way and if feasible to make path, schedule the resource.

• Signaling processAt the right moment signal the domains to make the path


• AutoBAHN service overview…• AAI in AutoBAHN…

– Overview– AA Scenario



• Progress…

Connect. Communicate. CollaborateOverview• Based on the work made by another GN2 project research

activity (GN2-JRA5) – EduGAIN, a federator of already established AAIs all

over European countries for inter-domain services• A chained-solution is adopted:

– A user is authenticated and his/her BoD request is authorized successively in each domain on the path where bandwidth should be scheduled.

– The scheduled resource are enabled in each domain by the Domain Manager (DM) only after AA


AutoBAHN interactions with AAI1. Home domain’s user AuthN

Interaction with the local AAI to authenticate the user and retrieve his/her/its attributes

2. WebServices WS communication (e.g. IDMs and DMs)Existing trust between IDMs and between IDM-DMUsing X.509 certificates signed by eduGAIN (using ssl)

3. Inter module communications; no AAI needed

2

2 222

1


AAI and the AutoBAHN processes• Topology updating process

WS communication (between IDMs and IDM-DM)interaction 2

• BoD requestCommunication with automated or human user: interaction 1

• PathfindingInter module communication (IDM): interaction 3

• Resource scheduling processWS communication (between IDMs and IDM-DM)interaction 2

• Signaling processWS communication (between IDMs and IDM-DM)interaction 2

Connect. Communicate. CollaborateHome domain’s user AuthN• An eduGAIN filter intercepts the user requests and interact with the

local AAI• Two possible user cases:

– An automated user makes a BoD request• WebServices are used for communication between the

automated user and AutoBAHN application (IDM)• Automated user has certificate: The automated user can directly

send the AuthN information (no interaction needed for a login + AuthN information like in human user case)

– A human user makes a BoD request via a web portal• The user is redirected to its local AAI using http redirections

• AuthR (after AuthN) is common for both user cases.


JRA3 blockeduGAIN block

AAI local block

Home domain’s user AuthNAutomated user

Step 1’ Step 2’

User

Local AAI: IDP/web SSO Shibboleth, PAPI, etc

User Access Module & other modules

AAI/policy Module

eduGAIN filter

JRA3 DB

1’

User sends the AuthN information

eduGAIN filter sends this information to the local AAI to authenticate the user

JRA3 IDM2’

User info

… Attributes store & identity provider

3’

certificate

User info

…


Attributes store & identity provider


AAI/policy Module

eduGAIN filter

JRA3 DB

4’

The local AAI sends the response with the user attributes associated to AutoBAHN

JRA3 IDM

Usercertificate

5’6’

5-6: The filter sends the AuthN response and the user replies sending the BoD request to the IDM



AAI local block

User



AAI/policy Module

eduGAIN filter

JRA3 DB

1

2, 3

HTTP Redirect:

eduGAIN filter redirects the user to its local AAI

JRA3 IDM

User

User info

…




AAI/policy Module

eduGAIN filter

JRA3 DB

5

6

User AuthN in its local AAI

4

JRA3 IDM

Home domain’s user AuthNHuman user

Step 1 Step 2


User

User info

…




AAI/policy Module

eduGAIN filter

JRA3 DB

7

The IDP redirects the user to the JRA3 service

The user attributes associated to autoBAHN are also sent

JRA3 IDM

User

User info

…




AAI/policy Module

eduGAIN filter

JRA3 DB

The IDM sends the BoD request and the user fills in the parameters

8

9

JRA3 IDM

Home domain’s user AuthNHuman user

Step 3 Step 4


User

User info

…



JRA3 IDM


AAI/policy Module

eduGAIN filter

JRA3 DB

10

11

12 13

14

The BoD request is sent to the policy module and the attributes are retrieved

User info

…



JRA3 IDM


AAI/policy Module

eduGAIN filter

JRA3 DB

15,16

17

The policy module retrieves the rules in the JRA3 DB and compare it to the BoD request

18

Home domain AuthRStep A Step B


User

User info

…



Existing trust between IDM’s

XML X.509


AAI/policy Module

eduGAIN filter

JRA3 DB

eduGAIN module: concatenation BoD params + attributes


AAI/policy Module

JRA3 DB

19

21,22 20

BoD Id BoD param attr

eduGAIN module: extraction of BoD params & attributes

23JRA3 IDM JRA3 IDM

24

Inter-domain AuthRStep C


User

User info

…




AAI/policy Module

eduGAIN filter

JRA3 DB

32

JRA3 IDM


AAI/policy Module

JRA3 DB

25

31

JRA3 IDM


AAI/policy Module

JRA3 DB

27,28 26

JRA3 IDM

30

29

Home & Source domain Linking domain Destination domain

Inter-domain AuthRStep D


AAI local block


Policy module and attributes (1/2)• AuthR information is stored in the JRA3 DB

– The eduGAIN filter avoids problems of different rule formats stored in local AAIs

• Define entries like:jra3.renater.projects.DEISA

• Apply rules for these entries:jra3.*.projects.DEISA = 1Gbit/s

• Advantages– Granularity and accuracy (if wanted) of rules– Easy maintenance and flexibility

• Existing AuthR engines like PERMIS will be used


Policy module and attributes (2/2)• The user attributes which can be used for AuthR are:

– Role– Project– Home network domain– NREN– This list can be updated

• These attributes are stored in the local AAI• Mapping with BoD information stored in the JRA3 DB to

authorize a BoD request• Use of GIdP (GN2 activity) if a local AAI doesn’t exist for

the user making the BoD request


• AutoBAHN service overview…• AAI in AutoBAHN…

– Overview– AAI Scenario



• Progress…

Connect. Communicate. CollaborateProgress• AuthN

– Interface:• Automated user: Being implemented by GN2 JRA3. Has to be

adapted to eduGAIN filter (certificate).• Human user: Web portal to make BoD request. Implemented by

GN2 JRA3 : ~ Q3 2007– eduGAIN filter for user AuthN:

• Automated user: Will be implemented by GN2 JRA5. • Human user: Being implemented by GN2 JRA5. First version

ready next month• AuthR

– Work started to analyze how to use PERMIS in AutoBAHN

Connect. Communicate. CollaborateQuestions?

simon muyal, [email protected] victor reijs, [email protected]

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