AAI WG EMI Christoph Witzig on behalf of EMI AAI WG

EMI INFSO-RI Comments Disclaimer: This is work in progress that has just started We are aware that some of these issues have already been discussed within EuGridPMA 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 2

EMI INFSO-RI Content EMI AAI WG Identified use-cases Security Token Service Policy issues Next steps 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 3

EMI INFSO-RI EMI AAI WG EMI proposal mentions interoperability of EMI / Grid with AAIs, in particular – „Easier“ credential handling for the user – Interoperability with Shibboleth and kerberos domains Members from – CNAF, HIP, NKUOA, SWITCH, UWAR 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 4

EMI INFSO-RI Objectives 1.Identify use-cases how EMI could support AAI 2.Support sub-set of identified use-cases within EMI 3.Reachout to other parties involved – EuGridPMA  Trust – ESFRI, EGI, … 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 5

EMI INFSO-RI Use Case 1: Obtaining a X.509 Based on token from another domain 1a) short-lived credential  next slide 1b) long-lived credential Well-known for EuGridPMA  SLCS, MICS profile 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 6

EMI INFSO-RI SLCS 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 7 slcs-init: command line tool User Agent handles WebSSO mechanism

EMI INFSO-RI Portal obtains X.509 from – Certificate store (e.g. myproxy) – „CA“ Note: CA has a very broad meaning here – not necessarily EUGridPMA CA Based on portal request (portal acting on behalf of user) Based on SAML issued by IdP (delegation)  next slide Note: New use-case, becoming available now 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 8 Use Case 2: AAI-enabled portals to Grid infrastructures

EMI INFSO-RI Use Case 2: AAI-enabled portals 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 9

EMI INFSO-RI Use Case 3: AAI-enabled portals for displaying and accessing Grid information Any portal can easily be accessed through AAI – Low priority  typical Grid administrator already has X /05/2010 STS SAML Trust Domain, EUGridPMA Meeting 10

EMI INFSO-RI Use Case 4 : Security Token Service A service obtains a security token and needs to convert it into another security token in order to access another service (e.g. Grid service) Example: – Incoming token: SAML, kerberos – Outgoing token: X.509 Note: very general use-case 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 11

EMI INFSO-RI Use Case 5: Use of AAI attributes in Grid services Today: attributes are issued by VOMS Tomorrow: non-VO attributes can be issued by AAI Attributes in question are few, simple but possibly very important, such as Employing institution Afflilation (student, professor,...) Study branch (biology, physics 5th semester) Question: What requirements should be put on AA? 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 12

EMI INFSO-RI Use Case 6: VO Registration Identity vetting based on AAI in registration process – Possibly involving AAI attributes – Low priority established mechanism exists Interesting if other communities bring large number of users 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 13

EMI INFSO-RI Use-cases: Summary Use- case DescriptionStatus 1X.509 issuance based on AAI„Solved“ (but needs improvement!) 2AAI-enabled portalsSolutions exist SAML delegation new 3AAI-enabled Grid info portalsLow priority 4STSNew, general purpose service, high priority 5Use of AAI attributes in GridInteresting, potentially very important 6VO registrationLow priority 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 14

EMI INFSO-RI Security Token Service: Functionality (1/2) Authenticates and authorizes users based on security tokens Transforms a security token (the claim) into another security token suitable for the requested service Username token into SAML token SAML token into X.509 token Aggregates required information from external Attribute Authorities Establishes a trust relation between different application domains Shibboleth domain vs Grid domain 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 15

EMI INFSO-RI Security Token Service: Functionality (2/2) Web Service (SOAP) based protocol WS-Trust profile – Version 0 (dated Jan 2008!) – Basic Operations: Request token Renew token Cancel token Validate token Easy expansion to handle new tokens Prospect: Integrated with Shibboleth IdP 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 16

EMI INFSO-RI Security Token Service: Architecture Profile Handler implements WS-Trust profile Token Authority manages security tokens Resolver retrieves information, attributes from external authorities (LDAP, Online CA, VOMS,...) 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 17 Note: Prospect of building on Shibboleth (IdP v3)

EMI INFSO-RI /05/2010 STS SAML Trust Domain, EUGridPMA Meeting 18 Trust Model: X.509 to SAML X.509 Validation – Service A and STS validate the X.509 token (X.509 trust based on the IGTF trust anchors) SAML Validation – Service B must validate and trust the SAML token issued by the STS (SAML Trust Domain)

EMI INFSO-RI /05/2010 STS SAML Trust Domain, EUGridPMA Meeting 19 Trust Model: SAML to X.509 SAML Validation – Service A and STS must validate and trust the SAML token issued by an IdP/AA (SAML Trust Domain) X.509 Validation – Service B validates the X.509 token issued by the STS (based on the IGTF trust)

EMI INFSO-RI /05/2010 STS SAML Trust Domain, EUGridPMA Meeting 20 SAML Trust Model SAML Token Issuance – STS must be able to issue SAML token to another service (signed and encrypted?) SAML Token Validation and Trust – Services must be able to validate and trust a SAML token issued by another service (STS, IdP, Attribute Authority, …) => SAML Trust Domain must be defined – Using Metadata (Shibboleth) Entity ID (uniquely identifies a SP, IdP, AA, …) Key-Info (X.509 certificate for signature/encryption)

EMI INFSO-RI Issues / Questions Handling trust between trust domains – Authentication assertions – Attributes handling (VOMS, IdP) – What requirements do you put on STS and other trust domain?  linking trust domains Issuance of certificates – proxies – Interaction STS/IdP/VOMS – Private key handling Attribute handling / attribute trust? 12/05/2010 STS SAML Trust Domain, EUGridPMA Meeting 21

EMI is partially funded by the European Commission under Grant Agreement RI Thank you! 12/05/ STS SAML Trust Domain, EUGridPMA Meeting