If you want kerberized logins on a server you run, you'll need a
*keytab* from accounts. Fill out the
[keytab request form](http://web.mit.edu/accounts/www/srvtabform.html),
-which sends them an e-mail. Ask for a "keytab"; by default they'll
-give you a srvtab, the Kerberos 4 analogue.
+which sends them an e-mail.
Your new keytab will be in
`/mit/accounts/srvtabs/FOR_YOURUSERNAME`, which is AFS and vaguely
insecure. You probably want to install it in `/etc/krb5.keytab`,
-and then randomize the key.
+and then set a new (random) key.
# mv -f /etc/krb5.keytab /etc/krb5.keytab.old # back up any keytab you already have
# mv /mit/accounts/srvtabs/FOR_JOEUSER/joeserver-new-keytab /etc/krb5.keytab
# k5srvutil change
+ # k5srvutil delold
If you're using Debathena, you can install the `debathena-ssh-server-config` package to configure Kerberos authentication on the server side. If not, make sure your `/etc/ssh/sshd_config` file includes the lines
This will let you SSH in with Kerberos.
Then create a file called `.k5login` in the home directory of
-whichever users you want to be able log into with Kerberos. List the
+whichever users you want to be able to log into with Kerberos. List the
full Kerberos principal of each user, one per line (e.g.,
`joeuser@ATHENA.MIT.EDU`)
-## Dealing with srvtabs
-
-If you don't specifically mention a "keytab" in your request to
-Accounts, they may give you the Kerberos 4 equivalent, a srvtab.
-
-In this case you'll want to convert the srvtab to a keytab, like so.
-
- $ ktutil
- ktutil: rst /mit/accounts/srvtabs/FOR_JOEUSER/joeserver-new-srvtab
- ktutil: wkt /etc/krb5.keytab
- ktutil: q
+If you don't want it to be possible to log in to a user account via
+Kerberos, create an empty `.k5login` file in their home directory.
+Otherwise, by default, you can log in to a user account with a Kerberos
+principal from the default realm (ATHENA, presumably) whose username
+matches; that is to say, an Athena user whose username matches a local
+username can log in to that local account. (One option to avoid this is
+to create a `.k5login` file in `/etc/skel` so that new accounts you
+later add get this file by default.)