KINIT(1)KINIT(1)NAMEkinit - obtain and cache Kerberos ticket-granting ticket
SYNOPSISkinit [-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]
DESCRIPTIONkinit obtains and caches an initial ticket-granting ticket for princi‐
pal.
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
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 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 renew‐
able_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 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. By default a host ticket is
requested but any principal may be specified. On a KDC, the spe‐
cial 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 password-based authentication.
-n Requests anonymous processing. Two types of anonymous princi‐
pals 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 nor‐
mal 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 authentication 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. If a principal name is specified
and the type of the default credentials cache supports a collec‐
tion (such as the DIR type), an existing cache containing cre‐
dentials for the principal is selected or a new one is created
and becomes the new primary cache. Otherwise, any existing con‐
tents 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 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 default Kerberos 5 credentials (ticket)
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
collection.
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 ALSOklist(1), kdestroy(1), kswitch(1), kerberos(1)KINIT(1)
