GNU networking utilities
8.2 Kerberos Authentication
rlogin was compiled with kerberos support, optins -x, -k, -K
are available. Each user may have a private authorization list in the file
.klogin in their home directory. Each line in this file should contain a
Kerberos principal name of the form principal.instance@realm. If the
originating user is authenticated to one of the principals named in .klogin,
access is granted to the account. The principal accountname.@localrealm is
granted access if there is no .klogin file. Otherwise a login and password
will be prompted for on the remote machine as in login(1). To avoid
certain security problems, the .klogin file must be owned by the remote user.
If Kerberos authentication fails, a warning message is printed and the
standard Berkeley rlogin is used instead.