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-.\" Copyright 1989, 2011 by the Massachusetts Institute of Technology.
-.\"
-.\" For copying and distribution information,
-.\" please see the file <mit-copyright.h>.
-.\" "
-.TH KERBEROS 1
-.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
-Kerberos-enabled programs without having to present passwords.
-.PP
-If you enter your username and
-.I kinit
-responds with this message:
-.PP
-kinit(v5): Client not found in Kerberos database while getting initial
-credentials
-.PP
-you haven't been registered as a Kerberos user.  See your system
-administrator.
-.PP
-A Kerberos name usually contains three parts.  The first is the
-.IR primary ,
-which is usually a user's or service's name.  The second is the
-.IR 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 fully qualified 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
-.IR realm .
-The realm corresponds to the Kerberos service providing authentication
-for the principal.
-.PP
-When writing a Kerberos name, the principal name is separated from the
-instance (if not null) by a slash, 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
-david
-jennifer/admin
-joeuser@BLEEP.COM
-cbrown/root@FUBAR.ORG
-.in -8
-.fi
-.PP
-When you authenticate yourself with Kerberos you get 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 those
-with the instance ``root'', 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 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
-.IR kinit (1)
-and
-.IR kdestroy (1)
-manual pages.
-.PP
-Kerberos tickets can be forwarded.  In order to forward tickets, you
-must request
-.I forwardable
-tickets when you
-.IR kinit .
-Once you have forwardable tickets, most Kerberos programs have a command
-line option to forward them to the remote host.
-.SH "ENVIRONMENT VARIABLES"
-Several environment variables affect the operation of Kerberos-enabled
-programs.  These include:
-.TP
-.B KRB5CCNAME
-Specifies the location of the credential cache, in the form
-\fITYPE\fP:\fIresidual\fP.  If no type prefix is present, the
-\fBFILE\fP type is assumed and \fIresidual\fP is the pathname of the
-cache file.  A collection of multiple caches may be used by specifying
-the \fBDIR\fP type and the pathname of a private directory (which must
-already exist).  The default cache file is /tmp/krb5cc_\fIuid\fP where
-\fIuid\fP is the decimal user ID of the user.
-.TP
-.B KRB5_KTNAME
-Specifies the location of the keytab file, in the form
-\fITYPE\fP:\fIresidual\fP.  If no type is present, the \fBFILE\fP type
-is assumed and \fIresidual\fP is the pathname of the keytab file.  The
-default keytab file is /etc/krb5.keytab.
-.TP
-.B KRB5_CONFIG
-Specifies the location of the Kerberos configuration file.  The
-default is /etc/krb5.conf.
-.TP
-.B KRB5_KDC_PROFILE
-Specifies the location of the KDC configuration file, which contains
-additional configuration directives for the Key Distribution Center
-daemon and associated programs.  The default is
-/usr/local/var/krb5kdc/kdc.conf.
-.TP
-.B KRB5RCACHETYPE
-Specifies the default type of replay cache to use for servers.  Valid
-types include "dfl" for the normal file type and "none" for no replay
-cache.
-.B KRB5RCACHEDIR
-Specifies the default directory for replay caches used by servers.
-The default is the value of the \fBTMPDIR\fP environment variable, or
-/var/tmp if \fBTMPDIR\fP is not set.
-.TP
-.B KRB5_TRACE
-Specifies a filename to write trace log output to.  Trace logs can
-help illuminate decisions made internally by the Kerberos libraries.
-The default is not to write trace log output anywhere.
-.PP
-Most environment variables are disabled for certain programs, such as
-login system programs and setuid programs, which are designed to be
-secure when run within an untrusted process environment.
-.SH "SEE ALSO"
-kdestroy(1), kinit(1), klist(1), kswitch(1), kpasswd(1), ksu(1),
-krb5.conf(5), kdc.conf(5), kadmin(1), kadmind(8), kdb5_util(8),
-krb5kdc(8)
-.SH BUGS
-.SH AUTHORS
-Steve Miller, MIT Project Athena/Digital Equipment Corporation
-.br
-Clifford Neuman, MIT Project Athena
-.br
-Greg Hudson, MIT Kerberos Consortium
-.SH HISTORY
-The MIT Kerberos 5 implementation was developed at MIT, with
-contributions from many outside parties.  It is currently maintained
-by the MIT Kerberos Consortium.
-.SH RESTRICTIONS
-Copyright 1985,1986,1989-1996,2002,2011 Massachusetts Institute of Technology