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.TH "KINIT" "1" "January 06, 2012" "0.0.1" "MIT Kerberos"
.SH NAME
kinit \- obtain and cache Kerberos ticket-granting ticket
.
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.SH SYNOPSIS
.INDENT 0.0
.TP
.B \fBkinit\fP
.sp
[\fB\-V\fP]
[\fB\-l\fP \fIlifetime\fP]
[\fB\-s\fP \fIstart_time\fP]
[\fB\-r\fP \fIrenewable_life\fP]
[\fB\-p\fP | \-\fBP\fP]
[\fB\-f\fP | \-\fBF\fP]
[\fB\-a\fP]
[\fB\-A\fP]
[\fB\-C\fP]
[\fB\-E\fP]
[\fB\-v\fP]
[\fB\-R\fP]
[\fB\-k\fP [\-\fBt\fP \fIkeytab_file\fP]]
[\fB\-c\fP \fIcache_name\fP]
[\fB\-n\fP]
[\fB\-S\fP \fIservice_name\fP]
[\fB\-T\fP \fIarmor_ccache\fP]
[\fB\-X\fP \fIattribute[=value]\fP]
[\fIprincipal\fP]
.UNINDENT
.SH DESCRIPTION
.sp
\fIkinit\fP obtains and caches an initial ticket\-granting ticket for principal.
.SH OPTIONS
.INDENT 0.0
.INDENT 3.5
.sp
\fB\-V\fP display verbose output.
.INDENT 0.0
.TP
.B \fB\-l\fP \fIlifetime\fP
.sp
requests a ticket with the lifetime lifetime. The
value for lifetime must be followed immediately by one
of the following delimiters:
.sp
.nf
.ft C
s seconds
m minutes
h hours
d days
.ft P
.fi
.sp
as in "kinit \-l 90m". You cannot mix units; a value of "3h30m" will result in an error.
.sp
If the \fB\-l\fP option is not specified, the default ticket lifetime
(configured by each site) is used. Specifying a ticket lifetime longer than the maximum
ticket lifetime (configured by each site) results in a ticket with the maximum lifetime.
.TP
.B \fB\-s\fP \fIstart_time\fP
.sp
requests a postdated ticket, valid starting at
\fIstart_time\fP. Postdated tickets are issued with the
\fIinvalid\fP flag set, and need to be fed back to the kdc
before use.
.TP
.B \fB\-r\fP \fIrenewable_life\fP
.sp
requests renewable tickets, with a total lifetime of
\fIrenewable_life\fP. The duration is in the same format as
the \fB\-l\fP option, with the same delimiters.
.UNINDENT
.sp
\fB\-f\fP request forwardable tickets.
.sp
\fB\-F\fP do not request forwardable tickets.
.sp
\fB\-p\fP request proxiable tickets.
.sp
\fB\-P\fP do not request proxiable tickets.
.sp
\fB\-a\fP request tickets with the local address[es].
.sp
\fB\-A\fP request address\-less tickets.
.sp
\fB\-C\fP requests canonicalization of the principal name.
.sp
\fB\-E\fP treats the principal name as an enterprise name.
.INDENT 0.0
.TP
.B \fB\-v\fP
.sp
requests that the ticket granting ticket in the cache
(with the \fIinvalid\fP flag set) be passed to the KDC for validation.
If the ticket is within its requested time range,
the cache is replaced with the validated ticket.
.TP
.B \fB\-R\fP
.sp
requests renewal of the ticket\-granting ticket.
Note that an expired ticket cannot be renewed, even if the ticket
is still within its renewable life.
.TP
.B \fB\-k\fP [\fB\-t\fP \fIkeytab_file\fP]
.sp
requests a ticket, obtained from a key in the local host\(aqs \fIkeytab\fP file.
The name and location of the key tab file may be specified with the
\fB\-t\fP \fIkeytab_file\fP option; otherwise the default name and location will be used.
By default a host ticket is requested but any principal may be specified.
On a KDC, the special keytab location \fBKDB:\fP can be used to indicate that kinit
should open the KDC database and look up the key directly.
This permits an administrator to obtain tickets as any principal that
supports password\-based authentication.
.TP
.B \fB\-n\fP
.sp
Requests anonymous processing.
Two types of anonymous principals are supported.
.sp
For fully anonymous Kerberos, configure pkinit on the KDC and configure
\fIpkinit_anchors\fP in the client\(aqs krb5.conf. Then use the \fB\-n\fP option with
a principal of the form \fI@REALM\fP (an empty principal name followed by the
at\-sign and a realm name). If permitted by the KDC, an anonymous ticket will be returned.
.sp
A second form of anonymous tickets is supported; these realm\-exposed tickets
hide the identity of the client but not the client\(aqs realm.
For this mode, use \fBkinit \-n\fP with a normal principal name.
If supported by the KDC, the principal (but not realm) will be replaced by the anonymous principal.
.sp
As of release 1.8, the MIT Kerberos KDC only supports fully anonymous operation.
.TP
.B \fB\-T\fP \fIarmor_ccache\fP
.sp
Specifies the name of a credential cache that already contains a ticket. If supported by the KDC, This
ccache will be used to armor the request so that an attacker would have to know both the key of the armor
ticket and the key of the principal used for authentication in order to attack the request. Armoring also
makes sure that the response from the KDC is not modified in transit.
.TP
.B \fB\-c\fP \fIcache_name\fP
.sp
use \fIcache_name\fP as the Kerberos 5 credentials (ticket) cache name and location;
if this option is not used, the default cache name and location are used.
.sp
The default credentials cache may vary between systems. If
the \fBKRB5CCNAME\fP environment variable is set, its value is
used to name the default ticket cache. If a principal name
is specified and the type of the default credentials cache
supports a collection (such as the DIR type), an existing
cache containing credentials for the principal is selected
or a new one is created and becomes the new primary cache.
Otherwise, any existing contents of the default cache are
destroyed by kinit.
.TP
.B \fB\-S\fP \fIservice_name\fP
.sp
specify an alternate service name to use when getting initial tickets.
.TP
.B \fB\-X\fP \fIattribute\fP [= \fIvalue\fP ]
.sp
specify a pre\-authentication \fIattribute\fP and \fIvalue\fP to be passed to pre\-authentication plugins.
The acceptable attribute and value values vary from pre\-authentication plugin to plugin.
This option may be specified multiple times to specify multiple attributes.
If no value is specified, it is assumed to be "yes".
.sp
The following attributes are recognized by the OpenSSL pkinit pre\-authentication mechanism:
.INDENT 7.0
.INDENT 3.5
.sp
\fBX509_user_identity\fP = \fIvalue\fP
.INDENT 0.0
.INDENT 3.5
.sp
specify where to find user\(aqs X509 identity information
.UNINDENT
.UNINDENT
.sp
\fBX509_anchors\fP = \fIvalue\fP
.INDENT 0.0
.INDENT 3.5
.sp
specify where to find trusted X509 anchor information
.UNINDENT
.UNINDENT
.sp
\fBflag_RSA_PROTOCOL\fP [ = \fIyes\fP ]
.INDENT 0.0
.INDENT 3.5
.sp
specify use of RSA, rather than the default Diffie\-Hellman protocol
.UNINDENT
.UNINDENT
.UNINDENT
.UNINDENT
.UNINDENT
.UNINDENT
.UNINDENT
.SH ENVIRONMENT
.sp
\fIkinit\fP uses the following environment variables:
.INDENT 0.0
.INDENT 3.5
.INDENT 0.0
.TP
.B \fBKRB5CCNAME\fP
.sp
Location of the default Kerberos 5 credentials (ticket)
cache, in the form \fItype\fP:\fIresidual\fP. If no type prefix is
present, the \fBFILE\fP type is assumed. The type of the
default cache may determine the availability of a cache
collection; for instance, a default cache of type \fBDIR\fP
causes caches within the directory to be present in the
collection.
.UNINDENT
.UNINDENT
.UNINDENT
.SH FILES
.sp
/tmp/krb5cc_[uid] default location of Kerberos 5 credentials cache ([uid] is the decimal UID of the user).
.sp
/etc/krb5.keytab default location for the local host\(aqs keytab file.
.SH SEE ALSO
.sp
klist(1), kdestroy(1), kerberos(1)
.SH AUTHOR
MIT
.SH COPYRIGHT
2011, MIT
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