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+.\" $Id: kerberos.1,v 1.2 1996/06/12 21:29:16 bg Exp $
+.\" Copyright 1989 by the Massachusetts Institute of Technology.
+.\"
+.\" For copying and distribution information,
+.\" please see the file <mit-copyright.h>.
+.\"
+.TH KERBEROS 1 "Kerberos Version 4.0" "MIT Project Athena"
+.SH NAME
+kerberos \- introduction to the Kerberos system
+
+.SH DESCRIPTION
+The
+Kerberos
+system authenticates
+individual users in a network environment.
+After authenticating yourself to
+Kerberos,
+you can use network utilities such as
+.IR rlogin ,
+.IR rcp ,
+and
+.IR rsh
+without
+having to present passwords to remote hosts and without having to bother
+with
+.I \.rhosts
+files.
+Note that these utilities will work without passwords only if
+the remote machines you deal with
+support the
+Kerberos
+system.
+All Athena timesharing machines and public workstations support
+Kerberos.
+.PP
+Before you can use
+Kerberos,
+you must register as an Athena user,
+and you must make sure you have been added to
+the
+Kerberos
+database.
+You can use the
+.I kinit
+command to find out.
+This command
+tries to log you into the
+Kerberos
+system.
+.I kinit
+will prompt you for a username and password.
+Enter your username and password.
+If the utility lets you login without giving you a message,
+you have already been registered.
+.PP
+If you enter your username and
+.I kinit
+responds with this message:
+.nf
+
+Principal unknown (kerberos)
+
+.fi
+you haven't been registered as a
+Kerberos
+user.
+See your system administrator.
+.PP
+A Kerberos name contains three parts.
+The first is the
+.I principal name,
+which is usually a user's or service's name.
+The second is the
+.I instance,
+which in the case of a user is usually null.
+Some users may have privileged instances, however,
+such as ``root'' or ``admin''.
+In the case of a service, the instance is the
+name of the machine on which it runs; i.e. there
+can be an
+.I rlogin
+service running on the machine ABC, which
+is different from the rlogin service running on
+the machine XYZ.
+The third part of a Kerberos name
+is the
+.I realm.
+The realm corresponds to the Kerberos service providing
+authentication for the principal.
+For example, at MIT there is a Kerberos running at the
+Laboratory for Computer Science and one running at
+Project Athena.
+.PP
+When writing a Kerberos name, the principal name is
+separated from the instance (if not null) by a period,
+and the realm (if not the local realm) follows, preceded by
+an ``@'' sign.
+The following are examples of valid Kerberos names:
+.sp
+.nf
+.in +8
+billb
+jis.admin
+srz@lcs.mit.edu
+treese.root@athena.mit.edu
+.in -8
+.fi
+.PP
+When you authenticate yourself with
+Kerberos,
+through either the workstation
+.I toehold
+system or the
+.I kinit
+command,
+Kerberos
+gives you an initial
+Kerberos
+.IR ticket .
+(A
+Kerberos
+ticket
+is an encrypted protocol message that provides authentication.)
+Kerberos
+uses this ticket for network utilities
+such as
+.I rlogin
+and
+.IR rcp .
+The ticket transactions are done transparently,
+so you don't have to worry about their management.
+.PP
+Note, however, that tickets expire.
+Privileged tickets, such as root instance tickets,
+expire in a few minutes, while tickets that carry more ordinary
+privileges may be good for several hours or a day, depending on the
+installation's policy.
+If your login session extends beyond the time limit,
+you will have to re-authenticate yourself to
+Kerberos
+to get new tickets.
+Use the
+.IR kinit
+command to re-authenticate yourself.
+.PP
+If you use the
+.I kinit
+command to get your tickets,
+make sure you use the
+.I kdestroy
+command
+to destroy your tickets before you end your login session.
+You should probably put the
+.I kdestroy
+command in your
+.I \.logout
+file so that your tickets will be destroyed automatically when you logout.
+For more information about the
+.I kinit
+and
+.I kdestroy
+commands,
+see the
+.I kinit(1)
+and
+.I kdestroy(1)
+manual pages.
+.PP
+Currently,
+Kerberos
+supports the following network services:
+.IR rlogin ,
+.IR rsh ,
+and
+.IR rcp .
+Other services are being worked on,
+such as the
+.IR pop
+mail system and NFS (network file system),
+but are not yet available.
+
+.SH "SEE ALSO"
+kdestroy(1), kinit(1), klist(1), kpasswd(1), des_crypt(3), kerberos(3),
+kadmin(8)
+.SH BUGS
+Kerberos
+will not do authentication forwarding.
+In other words,
+if you use
+.I rlogin
+to login to a remote host,
+you cannot use
+Kerberos
+services from that host
+until you authenticate yourself explicitly on that host.
+Although you may need to authenticate yourself on the remote
+host,
+be aware that when you do so,
+.I rlogin
+sends your password across the network in clear text.
+
+.SH AUTHORS
+Steve Miller, MIT Project Athena/Digital Equipment Corporation
+.br
+Clifford Neuman, MIT Project Athena
+
+The following people helped out on various aspects of the system:
+
+Jeff Schiller designed and wrote the administration server and its
+user interface, kadmin.
+He also wrote the dbm version of the database management system.
+
+Mark Colan developed the
+Kerberos
+versions of
+.IR rlogin ,
+.IR rsh ,
+and
+.IR rcp ,
+as well as contributing work on the servers.
+
+John Ostlund developed the
+Kerberos
+versions of
+.I passwd
+and
+.IR userreg .
+
+Stan Zanarotti pioneered Kerberos in a foreign realm (LCS),
+and made many contributions based on that experience.
+
+Many people contributed code and/or useful ideas, including
+Jim Aspnes,
+Bob Baldwin,
+John Barba,
+Richard Basch,
+Jim Bloom,
+Bill Bryant,
+Rob French,
+Dan Geer,
+David Jedlinsky,
+John Kohl,
+John Kubiatowicz,
+Bob McKie,
+Brian Murphy,
+Ken Raeburn,
+Chris Reed,
+Jon Rochlis,
+Mike Shanzer,
+Bill Sommerfeld,
+Jennifer Steiner,
+Ted Ts'o,
+and
+Win Treese.
+
+.SH RESTRICTIONS
+
+COPYRIGHT 1985,1986 Massachusetts Institute of Technology