ABFAB Y. Wei, Ed. Internet-Draft ZTE Corporation Intended status: Informational July 4, 2011 Expires: January 5, 2012 Federated Cross-Layer Access draft-wei-abfab-fcla-00 Abstract Network stratum and application stratum form a federation to faciliate user's access. Network operator acts as Identity Provider (IdP), and application reuses underlying network's security capabilities to simlify application's access. This document is to introduce such federated cross-layer access use case. Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. 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Wei Expires January 5, 2012 [Page 1] Internet-Draft Federated Cross-Layer Access July 2011 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Use Case . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5 4. Security Considerations . . . . . . . . . . . . . . . . . . . . 5 5. References . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5.1. Normative References . . . . . . . . . . . . . . . . . . . 5 5.2. Informative References . . . . . . . . . . . . . . . . . . 5 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 6 Wei Expires January 5, 2012 [Page 2] Internet-Draft Federated Cross-Layer Access July 2011 1. Introduction Currently it is agreed that digital identity is a crucial element in a service enviroment. Typically telecom operators provide access customers with identity which is associated with some form of trusted element on the network (e.g. SIM/UICC). Meanwhile the identity required by Web or non-Web services for users on is usually associated with username. Ordinarly telecom operators have tens of millons of users and can provide trusted identity and higher security. However the categories of service provided by telecom operators are relatively few. On the contrary most service providers on the Internet have limited amount of users and can not assure the security of user identity, but they can provide abundant kinds of service. Furthermore, user is reluntant to register too many accounts because it is inconvenient to remember dozens of passwords . These facts creates some driving forces that telecom is interworking with Internet. The stakeholders can benifit from these combination. For telecom operators, they can provide identity service, trusted security service, mobile payment service and sharing some user profiles according user's preferences. Telecom operators is not just providing pipeine for communication, but also become a part of service value chain. For service providers, they can focus on core business and reuse capabilities provided by telecom operators without worring about sources of users. For end users, they can enjoy seamless service experiences and improve security and privacy. GSMA Association IDM project address operators' requirements for emerging mobile application (such as, Single Sign-on, mobile payments and other UICC enabled applications). Several use cases are also identified[GSMA_IDM]. Liberty Alliance Telecommunications SIG investigates digital identity grown in both telecom and Internet, develops several use cases and proposes correspoding solutions for interworking these two different domains [TelecoSiG]. Currently some use cases [I-D.ietf-abfab-usecases] and architecture [I-D.lear-abfab-arch] are developed in IETF abfab working group. Inspired by the previous work, this document considers a use case which telecom operator acts as Identity provider (IdP) and federates with non-Web applications, e.g. Email, Messaging. This use case combines network stratum access and application stratum access, which is named as federated cross-layer access. 2. Use Case Telecom operators have a communication network infrastrure to Wei Expires January 5, 2012 [Page 3] Internet-Draft Federated Cross-Layer Access July 2011 provider users with a wealthy of access methods, such as ADSL (Asymmetric Digital Subscriber Line), 3G (3rd Generation), WLAN (Wireless Local Area Network) and Ethernet, etc. Telecom operator has a huge number of registered users, telecom network are trusted for users, thus it has a natural advantage to act as an IdP to serve for those service providers. Take mobile network for example, UE has pre-shared key (PSK) with HSS. UE is mutully authenticated with network during attach procedure. After authentication, a master session key (MSK) is created on both UE and AAA. EAP [RFC3748] can enable the above procedure. Telecom network supports Web or non-Web application. In some cases user prefers to choose non-Web application, e.g. Messaging service, VoIP, EMail service, etc. Based on the result of network stratum authentication and authorization, user can access applications without doing another authentication and authorization procedure. In this way, the system can implement federated cross-layer access. +-------------+ + Application | / +------+------+ / | / | / | / | / +-----+----+ +---+--+ | | | UE +----------+ Network | +------+ | | +----------+ Figure 1: Federated Cross-Layer Access Figure 1 shows the relation among UE, network and application. Firstly mutual authentication is performed between UE and Network, secondly UE accesses Application using Single Sign-ON (SSO) based on network stratum's authentication. In this case, a federation is formed between Network and Application. The brief steps are as follows: 1. When UE attach the Network, mutual authentication is performed master session key is created between them. 2. UE visits non-Web Application, e.g Messageing service, VoIP service, or Email service. Wei Expires January 5, 2012 [Page 4] Internet-Draft Federated Cross-Layer Access July 2011 3. Application has no information about the UE. The Application contacts Network to validate the authentication result in the network stratum. Application can find Network according the configuration or dynamical discovery protocol. 4. Network responds to Application with authentication result. 5. UE is authorized to access the Application. For federated cross-layer access, Network can assure the Application of the authenticity of user's identity, share some of use profile with Application. These can bring some benifits to stakeholders: o For telecom operators, it becomes part of the business value chain as an Identity Provider. o For service provider, it can focus on core competitive services without worrying about the number of registered users by reusing underlying security mechanisms during network stratum access. o For end users, seamless sevice is provided, security and privacy are improved. 3. IANA Considerations TODO 4. Security Considerations TODO 5. References 5.1. Normative References [RFC3748] Aboba, B., Blunk, L., Vollbrecht, J., Carlson, J., and H. Levkowetz, "Extensible Authentication Protocol (EAP)", RFC 3748, June 2004. 5.2. Informative References [I-D.lear-abfab-arch] Howlett, J., Hartman, S., Tschofenig, H., and E. Lear, "Application Bridging for Federated Access Beyond Web (ABFAB) Architecture", draft-lear-abfab-arch-02 (work in progress), March 2011. [I-D.ietf-abfab-usecases] Smith, R., Tysom, M., and S. Cooper, "Application Bridging Wei Expires January 5, 2012 [Page 5] Internet-Draft Federated Cross-Layer Access July 2011 for Federated Access Beyond web (ABFAB) Use Cases", draft-ietf-abfab-usecases-00 (work in progress), March 2011. [GSMA_IDM] GSM Association, "White paper on Identity Management Requirements, Issues, and Directions for Mobile Industry", August 2007, . [TelecoSiG] Liberty Alliance Project, "Bridging IMS and Internet Identity", December 2009, . Author's Address Yinxing Wei (editor) ZTE Corporation No 68, Zijinghua Road Nanjing, Jiangsu 210012 China Phone: +86 25 52871287 Email: wei.yinxing@zte.com.cn Wei Expires January 5, 2012 [Page 6]