Distributed Services with OpenAFS: for Enterprise and by Franco Milicchio

By Franco Milicchio

This ebook indicates intimately find out how to construct enterprise-level safe, redundant, and hugely scalable providers from scratch on most sensible of the open resource Linux working method, appropriate for small businesses in addition to immense universities. The center structure provided relies on Kerberos, LDAP, AFS, and Samba. it really is proven easy methods to combine internet, message comparable, information base and different prone with this spine. This structure presents a Single-Sign-On resolution for various buyer structures and will even be hired for clustering. even though it is carried out with Debian GNU/Linux, the content material should be utilized to different UNIX flavors.

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2 The xinetd Daemon Kerberos provides a way of propagating its database from the master to the slave KDCs with a daemon. Our choice is to use an on-demand service, started by a “super-server ” that takes care of every aspect. This meta-service is called Extended Internet Daemon, or xinetd, provided by the homonymous Debian package. 3BSD in 1986, providing extended facilities such as access control lists, TCP wrapping, broad logging services, and mechanisms to protect the system against port scanners.

The current version of Kerberos is the fifth, known as Kerberos V, usually with the Roman numeral, described in the official document RFC 4120, and by the subsequent IETF specifications RFC 3961, 3962, and 4121. The protocol is based on the Needham-Schroeder algorithm, and its first public version, Kerberos IV, was designed primarily by Steve Miller and Clifford Neuman at the MIT in the late 1980s. A comprehensive description of Kerberos is beyond the objectives of this book, and in the following paragraphs we will explain from a systemic point of view the processes in act with the authentication service simplifying the actual protocol.

Now the service can decrypt the data from the KDC forwarded by the client obtaining the session key. At this point it can decrypt the service acknowledge request and return a confirmation message to the client encrypting it with the session key which results in mutual authentication. Fig. 2. 1 Kerberos Network Authentication Protocol 35 The encrypted data sent from the KDC to the client and intended for the requested service is called ticket. The encoded service acknowledge request is called authenticator .

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