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.K5LOGIN(5)                                                        .K5LOGIN(5)

       .k5login - Kerberos V5 acl file for host access.

       The  .k5login file, which resides in a user's home directory, contains a list of the Kerberos principals.  Any-
       one 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.

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


       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:


       This would allow either system administrator to log in to these hosts using their Kerberos tickets  instead  of
       having  to type the root password.  Note that because "bob" retains the Kerberos tickets for his own principal,
       "bobATFUBAR.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.

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