kinit - obtain and cache Kerberos ticket-granting ticket
[-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][-T armor_ccache] [-X attribute[=value]]
kinit obtains and caches an initial ticket-granting ticket
-V display verbose output.
requests a ticket with the lifetime lifetime. The
value for lifetime must be followed immediately by one
of the following delimiters:
as in "kinit -l 90m". You cannot mix units; a value of
`3h30m' will result in an error.
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 life-
time (configured by each site) results in a ticket with
the maximum lifetime.
requests a postdated ticket, valid starting at
start_time. Postdated tickets are issued with the
invalid flag set, and need to be fed back to the kdc
requests renewable tickets, with a total lifetime of
renewable_life. The duration is in the same format as
the -l option, with the same delimiters.
-f request forwardable tickets.
-F do not request forwardable tickets.
-p request proxiable tickets.
-P do not request proxiable tickets.
-a request tickets with the local address[es].
-A request address-less tickets.
-C requests canonicalization of the principal name.
-E treats the principal name as an enterprise name.
-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.
-k [-t keytab_file]
requests a host ticket, obtained from a key in the
local host's keytab file. The name and location of the
keytab file may be specified with the -t keytab_file
option; otherwise the default name and location will be
-n Requests anonymous processing. Two types of anonymous
principals are supported. For fully anonymous Ker-
beros, configure pkinit on the KDC and configure
pkinit_anchors in the client's krb5.conf. 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
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 authenti-
cation in order to attack the request. Armoring also
makes sure that the response from the KDC is not
modified in transit.
use cache_name as the Kerberos 5 credentials (ticket)
cache name and location; if this option is not used,
the default cache name and location are used.
The default credentials cache may vary between systems.
If the KRB5CCNAME environment variable is set, its
value is used to name the default ticket cache. Any
existing contents of the cache are destroyed by kinit.
specify an alternate service name to use when getting
specify a pre-authentication attribute and value 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 multi-
ple times to specify multiple attributes. If no value
is specified, it is assumed to be "yes".
The following attributes are recognized by the OpenSSL pkinit
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:
KRB5CCNAME Location of the Kerberos 5 credentials
/tmp/krb5cc_[uid] default location of Kerberos 5 creden-
tials cache ([uid] is the decimal UID of
/etc/krb5.keytab default location for the local host's
klist(1), kdestroy(1), kerberos(1)
Man(1) output converted with