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Developing Grid Computing Infrastructure for University of Michigan: MGRID Approach

This outline presents the MGRID project at the University of Michigan, detailing the motivation, architecture, applications, and research goals. MGRID aims to optimize the UM network, enhance grid security middleware, deploy grid applications, and establish a production grid site within the university. By leveraging existing security services and providing an easy-to-use portal, MGRID facilitates access for faculty, staff, and students. The NTAP project focuses on network testing and performance tools, using a General-purpose Architecture for Reservation and Allocation (GARA) for bandwidth reservation and network configuration. Additionally, fine-grained authorization, signed group membership, and extended bandwidth reservation capabilities are highlighted. Cross-domain authorization is implemented through policy-based software, ensuring secure access control using attribute matching rules. With a user-friendly interface and scalable design, MGRID and NTAP projects contribute to the advancement of grid computing infrastructure at the University of Michigan.

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Developing Grid Computing Infrastructure for University of Michigan: MGRID Approach

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  1. Andy Adamson Center for Information Technology Integration University of Michigan, USA Using NMI Components in MGRID: A Campus Grid Infrastructure

  2. Outline • MGRID: Background and Motivation • MGRID Architecture • NTAP: A Grid Application • Distributed Authorization Issues • What's Next

  3. MGRID • Michigan Grid Research and Infrastructure Development is a collaborative effort of many parts of the University of Michigan focused on developing and deploying grid computing for the University of Michigan. • Characterize and optimize the UM network • Assist in the development of Grid security middleware • Determine the requirements for a production Grid site within the UM • Develop and test Grid Applications

  4. Why MGRID • Multiple Grid efforts at the U of M • Clusters • Automated network configuration and testing • Remote instrument operation • Middleware issues are difficult • Single solution • Leverage existing security services • Potentially large user base for Grid services

  5. U of M Security Services • Uniqname • Unique campus wide user name and UID • Kerberos V5 (multiple cells) • KX509 • Group Services • AFS PTS • LDAP (email groups)

  6. MGRID Architecture Web Server User Workstation Apache SSL – Client Certificate required mod ssl Browser 3 mod kct libpkcs11 Kerberos V5 4 KCT mod kx509 kx509 Kerberos 2 5 KCA kinit mod jk mod php Kerberos KDC 1 6 Tomcat GSI Grid Service LDAP CHEF 6 SASL Grid-Mapfile GateKeeper 7 Resource Mng Authorization Group Services Service 8

  7. MGRID Portal • Proxy KX509 credentials, keep the Globus client off workstations • Ease of use for U of M faculty, staff, and students • Kerberos + kx509 + browser = Grid access • Single point for PKI management • CA self-signed keys • CA policy files • Single entry point for MGRID services

  8. MGRID Portal • User workstation • KX509 to obtain user X509 credentials • KX509 Certificate available to browser • Additions to OpenSSL, required on Web Server • SSL handshake recorded • Web server SSL configured to require user X509 credentials

  9. MGRID Portal • SSL Handshake transcript • Contains all packets exchanged • Allows KCT to repeat user certificate verification • Handshake time stamp used • Apache module, mod_kct • Sends ssl handshake transcript to KCT service • Requests KCA Kerberos service ticket

  10. MGRID Portal • Apache module, mod_kx509 • Uses the KCA TGS • Obtains user proxy KX509 credentials • Places them in a ticket file • Apache module, mod_php • Creates RSL, uses KX509 credentials • CHEF runs in Tomcat • Communicates with Apache through mod_jk • Creates RSL, uses KX509 or MyProxy credentials

  11. MGRID Architecture Web Server User Workstation Apache SSL – Client Certificate required mod ssl Browser 3 mod kct libpkcs11 Kerberos V5 4 KCT mod kx509 kx509 Kerberos 2 5 KCA kinit mod jk mod php Kerberos KDC 1 6 Tomcat GSI Grid Service LDAP CHEF 6 SASL Grid-Mapfile GateKeeper 7 Resource Mng Authorization Group Services Service 8

  12. MGRID NTAP Project • NTAP: Network Testing and Performance • Globus Service to run network test and performance tools • Purpose: Help build and maintain a secure and functional network at UMICH • Runs on multi homed nodes placed in a VLANed network

  13. MGRID NTAP Architecture Host A Host B Router 1 Router 2 Router 3 Web Portal GSI GSI GSI NTAP 1 NTAP 2 NTAP 3 Group Services

  14. MGRID NTAP Project • Based on GARA: General-purpose Architecture for Reservation and Allocation • GARA bandwidth reservation • Adds and removes configuration stanza's in network hardware • Includes scheduler for future reservations • Security of communications and the ability to support roles is required

  15. MGRID NTAP Project • Added fine grained authorization • Added signed group membership RSL payload • Extended bandwidth reservation to be able to run arbitrary programs at a Grid service endpoint • Designed to easily add functionality • Network testing tools being run • Iperf, traceroute, ping, owamp, etc

  16. MGRID NTAP Architecture Host A Host B Local Domain Router 1 Router 2 Router 3 Web Portal GSI GSI GSI NTAP 1 NTAP 2 NTAP 3 Group Services

  17. Cross-domain Authorization • Implemented with Policy based software • Policy engine makes authorization decision • Input <attribute name, value> are matched against resource specific policy rules • Input attribute names are matched to policy attribute names by a string compare • Cross-domain attribute name space is therefore required

  18. Cross-domain Authorization • Attributes include • Group membership from group services • Resource request parameters: bandwidth, number of CPU's, etc from RSL • Environment parameters: time of day, CPU load, etc • Use of existing local group services is required • U of M has 100,000+ active uniqnames to manage • Avoid replicating data and management tasks

  19. Cross-domain Authorization • Our first design in use today uses a modular group membership call-out and the KeyNote Policy Engine • Group membership determined by • Secure RX call to AFS PTS • Fine-grained authorization expressed in KeyNote policy rules • Works across U of M campus

  20. MGRID Architecture Web Server User Workstation Apache SSL – Client Certificate required mod ssl Browser 3 mod kct libpkcs11 Kerberos V5 4 KCT mod kx509 kx509 Kerberos 2 5 KCA kinit mod jk mod php Kerberos KDC 1 6 Tomcat GSI Grid Service LDAP CHEF 6 SASL Grid-Mapfile GateKeeper 7 Resource Mng Authorization Group Services Service 8

  21. Authorization: Where? • Earlier is better • At the portal • RSL, group membership, and some environment attributes available • Can remove load from Grid Service • At the Grid Service • Needed when policy has components that can only be satisfied at end service • Both (divided policy)

  22. PERMIS • Similar functionality to KeyNote • Attributes and policy rules • Follows XACML standard • Signed policy stored in LDAP • Signed user attributes stored in LDAP • Current design requires new database of users

  23. MGRID: Whats Next? • Use XACML to exchange authorization data • XACML front end to existing UMICH group services • Replace grid-mapfile with LDAP call out • Central administration • Dynamic local cluster accounts • Investigate NFSv4 as a grid file system

  24. Summary • Kx509, CHEF, and PERMIS (XACML) NMI components are being integrated and tested by MGRID • We would like mod_kct and mod_kca to be considered for NMI-5 • Construction and management of a shared attribute name space is the largest problem facing cross-domain authorization

  25. Any Questions? http://mgrid.umich.edu

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