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kinit - obtain and cache Kerberos ticket-granting ticket


kinit [-V] [-l lifetime] [-s start_time] [-r renewable_life] [-p | -P] [-f | -F] [-a] [-A]
[-C] [-E] [-v] [-R] [-k [-t keytab_file]] [-c cache_name] [-n] [-S service_name] [-I
input_ccache] [-T armor_ccache] [-X attribute[=value]] [principal]


kinit obtains and caches an initial ticket-granting ticket for principal.


-V display verbose output.

-l lifetime
(duration string.) Requests a ticket with the lifetime lifetime.

For example, kinit -l 5:30 or kinit -l 5h30m.

If the -l 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) will not override the configured maximum ticket

-s start_time
(duration string.) Requests a postdated ticket. Postdated tickets are issued with
the invalid flag set, and need to be resubmitted to the KDC for validation before

start_time specifies the duration of the delay before the ticket can become valid.

-r renewable_life
(duration string.) Requests renewable tickets, with a total lifetime of

-f requests forwardable tickets.

-F requests non-forwardable tickets.

-p requests proxiable tickets.

-P requests non-proxiable tickets.

-a requests tickets restricted to the host's local address[es].

-A requests tickets not restricted by address.

-C requests canonicalization of the principal name, and allows the KDC to reply with a
different client principal from the one requested.

-E treats the principal name as an enterprise name (implies the -C option).

-v requests that the ticket-granting ticket in the cache (with the invalid 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.

-R 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.

Note that renewable tickets that have expired as reported by klist(1) may sometimes
be renewed using this option, because the KDC applies a grace period to account for
client-KDC clock skew. See krb5.conf(5) clockskew setting.

-k [-i | -t keytab_file]
requests a ticket, obtained from a key in the local host's keytab. The location of
the keytab may be specified with the -t keytab_file option, or with the -i option
to specify the use of the default client keytab; otherwise the default keytab will
be used. By default, a host ticket for the local host is requested, but any
principal may be specified. On a KDC, the special keytab location KDB: 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
authentication based on the key.

-n Requests anonymous processing. Two types of anonymous principals are supported.

For fully anonymous Kerberos, configure pkinit on the KDC and configure
pkinit_anchors in the client's krb5.conf(5). Then use the -n option with a
principal of the form @REALM (an empty principal name followed by the at-sign and a
realm name). If permitted by the KDC, an anonymous ticket will be returned.

A second form of anonymous tickets is supported; these realm-exposed tickets hide
the identity of the client but not the client's realm. For this mode, use kinit -n
with a normal principal name. If supported by the KDC, the principal (but not
realm) will be replaced by the anonymous principal.

As of release 1.8, the MIT Kerberos KDC only supports fully anonymous operation.

-I input_ccache
Specifies the name of a credentials cache that already contains a ticket. When
obtaining that ticket, if information about how that ticket was obtained was also
stored to the cache, that information will be used to affect how new credentials are
obtained, including preselecting the same methods of authenticating to the KDC.

-T armor_ccache
Specifies the name of a credentials cache that already contains a ticket. If
supported by the KDC, this cache will be used to armor the request, preventing
offline dictionary attacks and allowing the use of additional preauthentication
mechanisms. Armoring also makes sure that the response from the KDC is not
modified in transit.

-c cache_name
use cache_name as the Kerberos 5 credentials (ticket) cache location. If this
option is not used, the default cache location is used.

The default cache location may vary between systems. If the KRB5CCNAME environment
variable is set, its value is used to locate the default cache. If a principal
name is specified and the type of the default 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.

-S service_name
specify an alternate service name to use when getting initial tickets.

-X attribute[=value]
specify a pre-authentication attribute and value to be interpreted by
pre-authentication modules. The acceptable attribute and value values vary from
module to module. This option may be specified multiple times to specify multiple
attributes. If no value is specified, it is assumed to be "yes".

The following attributes are recognized by the PKINIT pre-authentication mechanism:

specify where to find user's X509 identity information

specify where to find trusted X509 anchor information

specify use of RSA, rather than the default Diffie-Hellman protocol


kinit uses the following environment variables:

Location of the default Kerberos 5 credentials cache, in the form type:residual.
If no type prefix is present, the FILE type is assumed. The type of the default
cache may determine the availability of a cache collection; for instance, a default
cache of type DIR causes caches within the directory to be present in the

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