KINIT(1) General Commands Manual KINIT(1)
NAME
kinit - obtain and cache Kerberos ticket-granting ticket
SYNOPSIS
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][-T armor_ccache] [-X attribute[=value]] [principal]
DESCRIPTION
kinit obtains and caches an initial ticket-granting ticket for principal.
OPTIONS
-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 delim-
iters:
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 lifetime
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.
-r renewable_life
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 speci-
fied with the -t keytab_file option; otherwise the default name and location will be used.
-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. 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.
-T armor_ccache
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.
-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.
-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 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".
The following attributes are recognized by the OpenSSL pkinit
pre-authentication mechanism:
X509_user_identity=value
specify where to find user's X509 identity information
X509_anchors=value
specify where to find trusted X509 anchor information
flag_RSA_PROTOCOL[=yes]
specify use of RSA, rather than the default Diffie-Hellman protocol
ENVIRONMENT
Kinit uses the following environment variables:
KRB5CCNAME Location of the Kerberos 5 credentials (ticket) cache.
FILES
/tmp/krb5cc_[uid] default location of Kerberos 5 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), kerberos(1)
KINIT(1)