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KINIT(1) KINIT(1)
NAME
kinit - obtain and cache Kerberos ticket-granting ticket
SYNOPSIS
kinit [-5] [-4] [-V] [-l lifetime] [-s start_time] [-r renew-
able_life] [-p | -P] [-f | -F] [-a] [-A] [-v] [-R] [-k [-t
keytab_file]] [-c cache_name] [-S service_name] [principal]
DESCRIPTION
kinit obtains and caches an initial ticket-granting ticket for princi-
pal.Thetypicaldefaultbehavioristoacquireonly Kerberos 5 tickets. How-
ever, if kinit was built with both Kerberos 4 support and with the
default behavior of acquiring both types of tickets, it will try to
acquire both Kerberos 5 and Kerberos 4 by default. Any documentation
particular to Kerberos 4 does not apply if Kerberos 4 support was not
built into kinit.
OPTIONS
-5 get Kerberos 5 tickets. This overrides whatever the default
built-in behavior may be. This option may be used with -4
-4 get Kerberos 4 tickets. This overrides whatever the default
built-in behavior may be. This option is only available if
kinit was built with Kerberos 4 compatibility. This option may
be used with -5
-V display verbose output.
-l lifetime
requests a ticket with the lifetime lifetime. The value for
lifetime must be followed immediately by one of the following
delimiters:
s seconds
m minutes
h hours
d days
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 life-
time longer than the maximum ticket lifetime (configured by
each site) results in a ticket with the maximum lifetime.
-s start_time
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 before use. (Not applicable to
Kerberos 4.)
-r renewable_life
requests renewable tickets, with a total lifetime of renew-
able_life. The duration is in the same format as the -l
option, with the same delimiters. (Not applicable to Kerberos
4.)
-f request forwardable tickets. (Not applicable to Kerberos 4.)
-F do not request forwardable tickets. (Not applicable to Ker-
beros 4.)
-p request proxiable tickets. (Not applicable to Kerberos 4.)
-P do not request proxiable tickets. (Not applicable to Kerberos
4.)
-a request tickets with the local address[es]. (Not applicable to
Kerberos 4.)
-A request address-less tickets. (Not applicable to Kerberos 4.)
-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. (Not applicable to Ker-
beros 4.)
-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. When using this option with Ker-
beros 4, the kdc must support Kerberos 5 to Kerberos 4 ticket
conversion.
-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 used. When using this option with
Kerberos 4, the kdc must support Kerberos 5 to Kerberos 4
ticket conversion.
-c cache_name
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. (Note: The default name for Ker-
beros 4 comes from the KRBTKFILE environment variable. This
option does not apply to Kerberos 4.)
-S service_name
specify an alternate service name to use when getting initial
tickets. (Applicable to Kerberos 5 or if using both Kerberos 5
and Kerberos 4 with a kdc that supports Kerberos 5 to Kerberos
4 ticket conversion.)
ENVIRONMENT
Kinit uses the following environment variables:
KRB5CCNAME Location of the Kerberos 5 credentials (ticket) cache.
KRBTKFILE Filename of the Kerberos 4 credentials (ticket) cache.
FILES
/tmp/krb5cc_[uid] default location of Kerberos 5 credentials cache
([uid] is the decimal UID of the user).
/tmp/tkt[uid] default location of Kerberos 4 credentials cache ([uid]
is the decimal UID of the user).
/etc/krb5.keytab
default location for the local host's keytab file.
SEE ALSO
klist(1), kdestroy(1), krb5(3)
KINIT(1)
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