[[!tag kerberos howto]]
## Why enable Kerberos on your system?
Convenience and security. With
[Kerberos](http://web.mit.edu/Kerberos/dialogue.html), a single
login grants access to all NetBSD web services. Configuration is easy
and you only have to do it once (sometimes less).
NetBSD needs to be configured to prevent Kerberos from being used
to log into _your_ system, and then to enable Kerberos.
7. Either disable Kerberos auth for `sshd`, `login`, etc. in
`/etc/pam.d`, or tell your relevant services not to use PAM.
/!\ Disabling KerberosAuthentication in `/etc/ssh/sshd_config` does **NOT** prevent `sshd` from invoking `pam_krb5.so` and prompting for a Kerberos password -- oops. Since you probably do not have a host key in the realm NETBSD.ORG you have little to fear from ssh's KerberosAuthentication method -- nothing can get tickets to use your machine, because there is no host instance for your machine shared between the NetBSD kerberos server and your local keytab. So, the bottom line: turn off UsePAM for `sshd` or adjust your PAM configuration; don't worry about KerberosAuthentication or GSSAPIAuthentication in `sshd` itself.
7. Create `/etc/krb5.conf` containing only the line `[libdefaults]`.
NetBSD will now autodiscover and uses the NETBSD.ORG KDC as defined
in DNS. To use Kerberized TNF services, log in with your Kerberos
$ kinit <username>@NETBSD.ORG
The right-hand side is a Kerberos realm, not a DNS domain. Case is significant!
## Mac OS X
OS X autodiscovers and uses the NETBSD.ORG KDC as defined in DNS.
To use Kerberized TNF services, log in with your Kerberos [[password]]:
7. Launch the `Ticket Viewer.app` from `/System/Library/CoreServices`
7. Press the "Add Identity" button
7. In the identity field enter your `<username>@NETBSD.ORG`
The right-hand side is a Kerberos realm, not a DNS domain. *Case is significant!*
7. Enter the password associated with this identity in the password field
By default Ticket Viewer.app will save password details in keychain, un-tick "Remember password in my keychain" if this is not desired behaviour
7. Press continue
If successful, you'll be returned to the main window with a new entry below the icons containing `<username>@NETBSD.ORG` and the date and time which the ticket obtained is due to expired.
## Windows XP
Windows does not provide an easy way to configure and use KDCs
different from the one embedded into an Active Directory.
Therefore, to use [[Kerberos]], you should follow the following
7. Download the
[MIT Kerberos for Windows](http://web.mit.edu/Kerberos/dist/#kfw-3.2)
installer. It is composed of different tools traditionally found
with Kerberos distributions, like
[[!template id=man name=kinit section=1]] or
[[!template id=man name=klist section=1]], and a Network Identity
Manager, an application used to manage credential caching of
7. Install the package. Use the default provided options, then
restart the computer.
7. The Network Identity Manager
should automatically start when you login. As there is no principal
currently configured, it should open a dialog box to obtain the
7. Enter your principal:
7. Click `Ok`. After a few seconds, it should obtain the TGT for
you from the NETBSD.ORG KDC.
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