Site Report. Plus Book Information
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1 Site Report Plus Book Information Wolfgang Gehrke Dipartimento di Informatica e Automazione Università degli Studi Roma Tre European AFS Workshop 2008 Wolfgang Gehrke wgehrke@dia.uniroma3.it (Dipartimento disite Informatica Report e Automazione Università degli Graz, Studi Sep Roma 24, 2008 Tre) 1 / 20
2 Outline 1 From Foreign to Own Cell 2 Documented Experience 3 Actual Context 4 Security Considerations 5 Idea for Project 6 Summary Wolfgang Gehrke wgehrke@dia.uniroma3.it (Dipartimento disite Informatica Report e Automazione Università degli Graz, Studi Sep Roma 24, 2008 Tre) 2 / 20
3 From Foreign to Own Cell Outsourced Cell users 260 (faculty, employees, guests) groups 25 (those reflected in NIS) volumes 360 (one per user) AFS Transarc OpenAFS AUTH kaserver Kerberos V NSS NIS remained over the years OS Unix RedHat Enterprise HW Dell rack GOAL unite flavors of Unix Wolfgang Gehrke wgehrke@dia.uniroma3.it (Dipartimento disite Informatica Report e Automazione Università degli Graz, Studi Sep Roma 24, 2008 Tre) 3 / 20
4 From Foreign to Own Cell Main Requirements Kerberos centralized authentication OpenLDAP directory service OpenAFS file service with self triggered replication servers Linux on off-the-shelf servers clients Linux (SSO), Mac OS X and Windows (personal use) one client IBM 64bit PowerPC with 8 CPUs and 16GB interest distributed and parallel computing use laboratories with software distribution also support for exams Wolfgang Gehrke wgehrke@dia.uniroma3.it (Dipartimento disite Informatica Report e Automazione Università degli Graz, Studi Sep Roma 24, 2008 Tre) 4 / 20
5 From Foreign to Own Cell Homegrown Cell users 220 (students) groups 12 (those reflected in LDAP) volumes 920 (4 per user: home, mail, web, profiles) AFS OpenAFS AUTH Kerberos V NSS OpenLDAP OS Debian stable (very convenient) HW Dell servers GOAL full control of the cell Wolfgang Gehrke wgehrke@dia.uniroma3.it (Dipartimento disite Informatica Report e Automazione Università degli Graz, Studi Sep Roma 24, 2008 Tre) 5 / 20
6 Documented Experience Book with Springer 2007 Distributed Services with OpenAFS (for Enterprise and Education) together with Franco Milicchio (errata at wgehrke/docs/errata.html) starts with basic services (NTP, DNS) explains briefly the theory of all services integrates web server, electronic mail, samba demonstrates Linux, Mac OS X, Windows clients shows application to clusters and laboratories extends to databases, DHCP, TFTP touches NFS, CVS, Jabber fault tolerance by service distribution Wolfgang Gehrke (Dipartimento disite Informatica Report e Automazione Università degli Graz, Studi Sep Roma 24, 2008 Tre) 6 / 20
7 Documented Experience Rough Sketch Kerberos V NTP DNS (DHCP+TFTP) OpenLDAP OpenAFS Wolfgang Gehrke wgehrke@dia.uniroma3.it (Dipartimento disite Informatica Report e Automazione Università degli Graz, Studi Sep Roma 24, 2008 Tre) 7 / 20
8 Documented Experience Rough Sketch continued Kerberos V OpenLDAP OpenAFS SMTP keytab HOME, aliases MAILDIR relay sasl-authd IMAP keytab HOME MAILDIR courier-authd SAMBA keytab HOME Profile user info WWW keytab HOME UserDir, DAV mod-auth-kerb NOT to forget: OpenSSL involved: symmetric key AND asymmetric key cryptography Wolfgang Gehrke wgehrke@dia.uniroma3.it (Dipartimento disite Informatica Report e Automazione Università degli Graz, Studi Sep Roma 24, 2008 Tre) 8 / 20
9 Documented Experience Kerberos V master/slave MIT Kerberos used (better integration with Debian) via PAM for RADIUS (INN or wireless clients) OpenLDAP via SASL with GSSAPI direct integration in Apache and PostgreSQL more applications like OpenVPN Heimdal alternative PKINIT in the context of grid computing HX509 with PKCS11 support olfgang Gehrke wgehrke@dia.uniroma3.it (Dipartimento disite Informatica Report e Automazione Università degli Graz, Studi Sep Roma 24, 2008 Tre) 9 / 20
10 Documented Experience LDAP sync replication OpenLDAP used source for name service switch (passwd, shadow, group) additionally for mail aliases storage for MAC addresses of hosts as database for Kerberos multi-master and dynamic configuration combination with further services like DHCP and DNS PKI certificate storage Wolfgang Gehrke (Dipartimento disite Informatica Report e Automazione Università Graz, degli Studi Sep 24, Roma 2008Tre) 10 / 20
11 Documented Experience OpenAFS volume replication WebDAV, Maildirs, Samba CVS, expansion backup scenarios cross-realm trust other OS for servers recent OS for clients debugging commands Wolfgang Gehrke (Dipartimento disite Informatica Report e Automazione Università Graz, degli Studi Sep 24, Roma 2008Tre) 11 / 20
12 Actual Context Related Technologies 1 DCE/DFS open-sourced by The Open Group 2 NFS version 4 with Kerberos support 3 Microsoft s Dfs 4 Samba 4 5 self-certifying file-system 6 encrypted file-systems 7 Google file-system 8 Hadoop file-system 9 Lustre Wolfgang Gehrke wgehrke@dia.uniroma3.it (Dipartimento disite Informatica Report e Automazione Università Graz, degli Studi Sep 24, Roma 2008Tre) 12 / 20
13 Actual Context Influence of Virtualization VMware with freeware versions XEN available in Debian, too VirtualBox acquired by SUN KVM with RedHat support XEN works for AFS clients possible for database servers maybe less suitable for file servers interesting in combination with iscsi olfgang Gehrke (Dipartimento disite Informatica Report e Automazione Università Graz, degli Studi Sep 24, Roma 2008Tre) 13 / 20
14 Security Considerations General Aspects OS hardening NTP authentication key DNS forward confirmed reverse DNS but weak point, clients could make use of LDAP internal firewall mandatory access controls intrusion detection and monitoring Wolfgang Gehrke (Dipartimento disite Informatica Report e Automazione Università Graz, degli Studi Sep 24, Roma 2008Tre) 14 / 20
15 Security Considerations Data Related integrity possible via ZFS confidentiality transmission weak point for the moment availability RO volume replication access control strong user authentication full disk encryption future for ZFS user level encryption try for example EncFS Wolfgang Gehrke (Dipartimento disite Informatica Report e Automazione Università Graz, degli Studi Sep 24, Roma 2008Tre) 15 / 20
16 Security Considerations OS Variety OpenBSD minimalistic secure approach could be used for database servers comes with Arla client OpenSolaris offers ZFS could be used for file servers e.g. Nexenta Core Platform close to Debian Other commercial alternatives Wolfgang Gehrke (Dipartimento disite Informatica Report e Automazione Università Graz, degli Studi Sep 24, Roma 2008Tre) 16 / 20
17 Idea for Project Distributed Workflow Engine inspired by workflows useful in the web context, too at our site: rather document flow event-based batch processing ideally to be distributed over several AFS Unix clients rule processing engine with overseer processes mutual exclusion with the help of file locking related theory: Petri nets Wolfgang Gehrke (Dipartimento disite Informatica Report e Automazione Università Graz, degli Studi Sep 24, Roma 2008Tre) 17 / 20
18 Idea for Project Workflow Patterns sequence parallel split synchronization exclusive choice simple merge Wolfgang Gehrke (Dipartimento disite Informatica Report e Automazione Università Graz, degli Studi Sep 24, Roma 2008Tre) 18 / 20
19 Summary Small Annoyances rapid Linux kernel development with API changes discussion on GPLv3 aklog -setpag PAG garbage collection normal commands not ACL aware delay of propagating ACL change file mode bits firewall settings Wolfgang Gehrke (Dipartimento disite Informatica Report e Automazione Università Graz, degli Studi Sep 24, Roma 2008Tre) 19 / 20
20 Summary Wish List full Kerberos V RW replication extended attributes and no directory limitations more than just one important keytab byte-range locks Unicode support for Windows native driver for Windows disconnected operation Wolfgang Gehrke wgehrke@dia.uniroma3.it (Dipartimento disite Informatica Report e Automazione Università Graz, degli Studi Sep 24, Roma 2008Tre) 20 / 20
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