linux man page for k5login

.K5LOGIN(5)                                                     File Formats Manual                                                    .K5LOGIN(5)

NAME
       .k5login - Kerberos V5 acl file for host access.

DESCRIPTION
       The  .k5login  file, which resides in a user's home directory, contains a list of the Kerberos principals.  Anyone with valid tickets for a
       principal in the file is allowed host access with the UID of the user in whose home directory the file resides.  One common use is to place
       a .k5login file in root's home directory, thereby granting system administrators remote root access to the host via Kerberos.

EXAMPLES
       Suppose the user "alice" had a .k5login file in her home directory containing the following line:

                 bob@FUBAR.ORG

       This would allow "bob" to use any of the Kerberos network applications, such as telnet(1), rlogin(1), rsh(1), and rcp(1), to access alice's
       account, using bob's Kerberos tickets.

       Let us further suppose that "alice" is a system administrator.  Alice and the other system administrators would have  their  principals  in
       root's .k5login file on each host:

                 alice@BLEEP.COM
                 joeadmin/root@BLEEP.COM

       This would allow either system administrator to log in to these hosts using their Kerberos tickets instead of having to type the root pass-
       word.  Note that because "bob" retains the Kerberos tickets for his own principal, "bob@FUBAR.ORG", he would not have any of the privileges
       that require alice's tickets, such as root access to any of the site's hosts, or the ability to change alice's password.

SEE ALSO
       telnet(1), rlogin(1), rsh(1), rcp(1), ksu(1), telnetd(8), klogind(8)

                                                                                                                                       .K5LOGIN(5)