1KINIT(1) MIT Kerberos KINIT(1)
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6 kinit - obtain and cache Kerberos ticket-granting ticket
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9 kinit [-V] [-l lifetime] [-s start_time] [-r renewable_life] [-p | -P]
10 [-f | -F] [-a] [-A] [-C] [-E] [-v] [-R] [-k [-t keytab_file]] [-c
11 cache_name] [-n] [-S service_name] [-I input_ccache] [-T armor_ccache]
12 [-X attribute[=value]] [principal]
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15 kinit obtains and caches an initial ticket-granting ticket for princi‐
16 pal. If principal is absent, kinit chooses an appropriate principal
17 name based on existing credential cache contents or the local username
18 of the user invoking kinit. Some options modify the choice of princi‐
19 pal name.
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22 -V display verbose output.
23 -l lifetime
25 (duration string.) Requests a ticket with the lifetime life‐
26 time.
27 For example, kinit -l 5:30 or kinit -l 5h30m.
29 If the -l option is not specified, the default ticket lifetime
31 (configured by each site) is used. Specifying a ticket lifetime
32 longer than the maximum ticket lifetime (configured by each
33 site) will not override the configured maximum ticket lifetime.
34 -s start_time
36 (duration string.) Requests a postdated ticket. Postdated
37 tickets are issued with the invalid flag set, and need to be
38 resubmitted to the KDC for validation before use.
39 start_time specifies the duration of the delay before the ticket
41 can become valid.
42 -r renewable_life
44 (duration string.) Requests renewable tickets, with a total
45 lifetime of renewable_life.
46 -f requests forwardable tickets.
48 -F requests non-forwardable tickets.
50 -p requests proxiable tickets.
52 -P requests non-proxiable tickets.
54 -a requests tickets restricted to the host's local address[es].
56 -A requests tickets not restricted by address.
58 -C requests canonicalization of the principal name, and allows the
60 KDC to reply with a different client principal from the one
61 requested.
62 -E treats the principal name as an enterprise name.
64 -v requests that the ticket-granting ticket in the cache (with the
66 invalid flag set) be passed to the KDC for validation. If the
67 ticket is within its requested time range, the cache is replaced
68 with the validated ticket.
69 -R requests renewal of the ticket-granting ticket. Note that an
71 expired ticket cannot be renewed, even if the ticket is still
72 within its renewable life.
73 Note that renewable tickets that have expired as reported by
75 klist(1) may sometimes be renewed using this option, because the
76 KDC applies a grace period to account for client-KDC clock skew.
77 See krb5.conf(5) clockskew setting.
78 -k [-i | -t keytab_file]
80 requests a ticket, obtained from a key in the local host's
81 keytab. The location of the keytab may be specified with the -t
82 keytab_file option, or with the -i option to specify the use of
83 the default client keytab; otherwise the default keytab will be
84 used. By default, a host ticket for the local host is
85 requested, but any principal may be specified. On a KDC, the
86 special keytab location KDB: can be used to indicate that kinit
87 should open the KDC database and look up the key directly. This
88 permits an administrator to obtain tickets as any principal that
89 supports authentication based on the key.
90 -n Requests anonymous processing. Two types of anonymous princi‐
92 pals are supported.
93 For fully anonymous Kerberos, configure pkinit on the KDC and
95 configure pkinit_anchors in the client's krb5.conf(5). Then use
96 the -n option with a principal of the form @REALM (an empty
97 principal name followed by the at-sign and a realm name). If
98 permitted by the KDC, an anonymous ticket will be returned.
99 A second form of anonymous tickets is supported; these
101 realm-exposed tickets hide the identity of the client but not
102 the client's realm. For this mode, use kinit -n with a normal
103 principal name. If supported by the KDC, the principal (but not
104 realm) will be replaced by the anonymous principal.
105 As of release 1.8, the MIT Kerberos KDC only supports fully
107 anonymous operation.
108 -I input_ccache
110 Specifies the name of a credentials cache that already contains a
111 ticket. When obtaining that ticket, if information about how that
112 ticket was obtained was also stored to the cache, that information
113 will be used to affect how new credentials are obtained, including
114 preselecting the same methods of authenticating to the KDC.
115 -T armor_ccache
117 Specifies the name of a credentials cache that already contains
118 a ticket. If supported by the KDC, this cache will be used to
119 armor the request, preventing offline dictionary attacks and
120 allowing the use of additional preauthentication mechanisms.
121 Armoring also makes sure that the response from the KDC is not
122 modified in transit.
123 -c cache_name
125 use cache_name as the Kerberos 5 credentials (ticket) cache
126 location. If this option is not used, the default cache loca‐
127 tion is used.
128 The default cache location may vary between systems. If the
130 KRB5CCNAME environment variable is set, its value is used to
131 locate the default cache. If a principal name is specified and
132 the type of the default cache supports a collection (such as the
133 DIR type), an existing cache containing credentials for the
134 principal is selected or a new one is created and becomes the
135 new primary cache. Otherwise, any existing contents of the
136 default cache are destroyed by kinit.
137 -S service_name
139 specify an alternate service name to use when getting initial
140 tickets.
141 -X attribute[=value]
143 specify a pre-authentication attribute and value to be inter‐
144 preted by pre-authentication modules. The acceptable attribute
145 and value values vary from module to module. This option may be
146 specified multiple times to specify multiple attributes. If no
147 value is specified, it is assumed to be "yes".
148 The following attributes are recognized by the PKINIT
150 pre-authentication mechanism:
151 X509_user_identity=value
153 specify where to find user's X509 identity information
154 X509_anchors=value
156 specify where to find trusted X509 anchor information
157 flag_RSA_PROTOCOL[=yes]
159 specify use of RSA, rather than the default Diffie-Hell‐
160 man protocol
161 disable_freshness[=yes]
163 disable sending freshness tokens (for testing purposes
164 only)
165
167 See kerberos(7) for a description of Kerberos environment variables.
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170 FILE:/tmp/krb5cc_%{uid}
171 default location of Kerberos 5 credentials cache
172 FILE:/etc/krb5.keytab
174 default location for the local host's keytab.
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177 klist(1), kdestroy(1), kerberos(7)
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180 MIT
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183 1985-2020, MIT
1841.18 KINIT(1)