August 2003
Intermediate to advanced
270 pages
10h 9m
English
Content preview from Kerberos: The Definitive GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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DNS and Kerberos
A properly functioning DNS server for your domain and functioning DNS resolvers on machines participating in your Kerberos realm is essential for the proper operation of your realm.
Traditional Unix Kerberos 5 implementations use the flat file /etc/krb5.conf file for hostname-to-Kerberos realm mapping, much like /etc/hosts can be used for name-to-IP mapping. The Kerberos configuration file contains two major pieces of information: the DNS domain name to Kerberos realm mappings, and a list of KDCs for each Kerberos realm. Obviously, this method does not scale, so just as DNS now serves the purpose of the old /etc/hosts file, DNS can also be used to provide Kerberos configuration.
Kerberos can use DNS as a service location protocol, by using the DNS SRV record as defined in RFC 2052. In addition, Kerberos can use a TXT record to locate the appropriate realm for a given host or domain name. These DNS entries are not required to run a Kerberos realm, but they do eliminate the need for manual configuration of clients. With these DNS records, Kerberos clients can find the appropriate KDCs without the use of a configuration file. Windows will establish the necessary SRV records automatically when an Active Directory domain is created. Those using Unix for their KDCs can create these DNS entries manually in their zone files as a convenience to clients.
Tip
Note that while Windows will use DNS to locate KDCs, it will not use DNS to locate any KDCs for any non-Windows Kerberos ...
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