1. doc.: IEEE 802.11-04/751r0 Submission July 2004 Max Riegel, SiemensSlide 1 Selling network access Views from a business perspective Max Riegel Siemens

2. doc.: IEEE 802.11-04/751r0 Submission July 2004 Max Riegel, SiemensSlide 2 Convention Center Airport Railway Station Campus Hotel Hospital Serving WLAN customers in public hot spots......often means selling network access in a competive environment.

3. doc.: IEEE 802.11-04/751r0 Submission July 2004 Max Riegel, SiemensSlide 3 N Portal based access control also known as UAM auth IP Config (DHCP) Internet HLR AAA 3GPP MNO Access Controller Wireless Integration Platform AAA CRM Billing Portal Server auth html RADIUS client

4. doc.: IEEE 802.11-04/751r0 Submission July 2004 Max Riegel, SiemensSlide 4 Portal based access control – not everybody’s darling! Portal based access control for public WLAN has been specified within the WiFi Alliance WISPr 1.0 Recommendation –Establish a common look-and-feel of the portal based access control. Portal based access control is currently used by all commercial public hotspots People in standardization depreciate the usage of UAM due to –No 2G/3G-like automatic network association –SIM support complicated –WLAN link unsecured weak mutual authentication, no over-the-air encryption, session hijacking –Browser redirect does not always work IEEE802.1X/EAP (Extensible Authentication Protocol) is seen as the best solution for public access. –has been adopted by IEEE802.11i

5. doc.: IEEE 802.11-04/751r0 Submission July 2004 Max Riegel, SiemensSlide 5 IEEE802.11i adds EAP and data encryption into the WLAN access procedure Internet Association Access to service IP-Configuration (DHCP) Authorization EAP Identity Request EAP Identity Response EAP Request EAP Response EAP Success Access Request Access Challenge Access Request Access Accept Authentication Server Key Management Data Encryption Master-Key distribution Extensible Authentication Protocol IEEE802.11i

6. doc.: IEEE 802.11-04/751r0 Submission July 2004 Max Riegel, SiemensSlide 6 Public WLAN access with 802.11i/EAP fixes the bugs but creates new issues 802.11i/EAP solves the issues for –2G/3G-like automatic network association w/ SIM –Secured WLAN connection... but creates new issues: Network Discovery and Selection Problem –details see: draft-ietf-eap-netsel-problem-00.txt –Access network discovery, identifier selection, AAA routing, payload routing; or: Discovery, Decision, and Selection User interaction and help in the case something goes wrong Support for more sophisticated business models, e.g. –Selection of different services during a particular session –Anonymous services, e.g. enrollment support... issues which are well supported by the UAM!

7. doc.: IEEE 802.11-04/751r0 Submission July 2004 Max Riegel, SiemensSlide 7 Portal based access control is like a ‘Mall’ Open anonymous access Very attractive and flexible to the customer ‘Have fun, but it may take time’ Two approaches for selling (access) 802.11i/EAP is like a ‘Vending machine’ Put in the right coin, push the button and you are done. If something fails, you are lost. ‘Dont ask

8. doc.: IEEE 802.11-04/751r0 Submission July 2004 Max Riegel, SiemensSlide 8 Combining EAP and UAM Both 802.11i/EAP as well as UAM are valuable approaches –802.11i/EAP for the experienced, repeating user –UAM for the ‘beginner’ and for exception cases Combining EAP & UAM is currently not possible. Why? Link establishment User authentication User security context IP-Configuration (DHCP) User authorization Access to service Establishment of communication channel Verification of user credentials No communication channel available prior to successful user authentication.

9. doc.: IEEE 802.11-04/751r0 Submission July 2004 Max Riegel, SiemensSlide 9 Traditional 802.11i/EAP Link establishment User authentication User security context IP-Configuration (DHCP) User authorization Access to service Unified access scheme Link establishment User authentication Anonymous security context IP-Configuration (DHCP) Default authorization Access to service User authorization Negotiation o.k. An unified approach for network access control

10. doc.: IEEE 802.11-04/751r0 Submission July 2004 Max Riegel, SiemensSlide 10 Conclusion UAM as well as EAP are valuable solutions for access control. ‘Secured’ UAM is currently not possible. An anonymous secured media-rich communication channel is needed before user authentication and authorization. There are several potential solutions for delayed authentication: –Enhanced EAP methods –Smart client based on https (see WISPr) –Layer-3 authentication protocol (PANA) Most urgent for public WLAN access, but may lead to a general solution later. Should become a topic in IEEE802.11 WIEN