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.Dd April 14, 2005
.Dt KTUTIL 1
.Os HEIMDAL
.Sh NAME
.Nm ktutil
.Nd manage Kerberos keytabs
.Sh SYNOPSIS
.Nm
.Oo Fl k Ar keytab \*(Ba Xo
.Fl Fl keytab= Ns Ar keytab
.Xc
.Oc
.Op Fl v | Fl Fl verbose
.Op Fl Fl version
.Op Fl h | Fl Fl help
.Ar command
.Op Ar args
.Sh DESCRIPTION
.Nm
is a program for managing keytabs.
Supported options:
.Bl -tag -width Ds
.It Fl v , Fl Fl verbose
Verbose output.
.El
.Pp
.Ar command
can be one of the following:
.Bl -tag -width srvconvert
.It Nm add Oo Fl p Ar principal Oc Oo Fl Fl principal= Ns Ar principal Oc \
Oo Fl V Ar kvno Oc Oo Fl Fl kvno= Ns Ar kvno Oc Oo Fl e Ar enctype Oc \
Oo Fl Fl keepold | Fl Fl keepallold | Fl Fl pruneall Oc \
Oo Fl Fl enctype= Ns Ar enctype Oc Oo Fl w Ar password Oc \
Oo Fl Fl password= Ns Ar password Oc Oo Fl r Oc Oo Fl Fl random Oc \
Oo Fl s Oc Oo Fl Fl no-salt Oc Oo Fl H Oc Op Fl Fl hex
Adds a key to the keytab. Options that are not specified will be
prompted for. This requires that you know the password or the hex key of the
principal to add; if what you really want is to add a new principal to
the keytab, you should consider the
.Ar get
command, which talks to the kadmin server.
.It Nm change Oo Fl r Ar realm Oc Oo Fl Fl realm= Ns Ar realm Oc \
Oo Fl Fl keepold | Fl Fl keepallold | Fl Fl pruneall Oc \
Oo Fl Fl enctype= Ns Ar enctype Oc \
Oo Fl Fl a Ar host Oc Oo Fl Fl admin-server= Ns Ar host Oc \
Oo Fl Fl s Ar port Oc Op Fl Fl server-port= Ns Ar port
Update one or several keys to new versions.  By default, use the admin
server for the realm of a keytab entry.  Otherwise it will use the
values specified by the options.
.Pp
If no principals are given, all the ones in the keytab are updated.
.It Nm copy Oo Fl Fl copy-duplicates Oc Ar keytab-src Ar keytab-dest
Copies all the entries from
.Ar keytab-src
to
.Ar keytab-dest .
Because entries already in
.Ar keytab-dest
are kept, this command functions to merge keytabs.
Entries for the same principal, key version number, and
encryption type in the
.Ar keytab-src
that are also in the
.Ar keytab-dest
will not be copied to the
.Ar keytab-dest
unless the
.Fl Fl copy-duplicates
option is given.
.It Nm get Oo Fl p Ar admin principal Oc \
Oo Fl Fl principal= Ns Ar admin principal Oc Oo Fl e Ar enctype Oc \
Oo Fl Fl no-create Oc \
Oo Fl Fl no-change-keys Oc \
Oo Fl Fl keepold | Fl Fl keepallold | Fl Fl pruneall Oc \
Oo Fl Fl enctypes= Ns Ar enctype Oc Oo Fl r Ar realm Oc \
Oo Fl Fl realm= Ns Ar realm Oc Oo Fl a Ar admin server Oc \
Oo Fl Fl admin-server= Ns Ar admin server Oc Oo Fl s Ar server port Oc \
Oo Fl Fl server-port= Ns Ar server port Oc Ar principal ...
.Pp
For each
.Ar principal ,
get a the principal's keys from the KDC via the kadmin protocol,
creating the principal if it doesn't exist (unless
.Fl Fl no-create
is given), and changing its keys to new random keys (unless
.Fl Fl no-change-keys
is given).
.Pp
If no
.Ar realm
is specified, the realm to operate on is taken from the first
principal.
.It Nm import Oo JSON-FILE Oc
Read an array of keytab entries in a JSON file and copy them to
the keytab.
Use the
.Nm list
command with its
.Fl Fl json
option
and
.Fl Fl keys
option to export a keytab.
.It Nm list Oo Fl Fl keys Oc Op Fl Fl timestamp Oo Op Fl Fl json Oc
List the keys stored in the keytab.
Use the
.Fl Fl json
and
.Fl Fl keys
options to export a keytab as JSON for importing with the
.Nm import
command.
.It Nm remove Oo Fl p Ar principal Oc Oo Fl Fl principal= Ns Ar principal Oc \
Oo Fl V kvno Oc Oo Fl Fl kvno= Ns Ar kvno Oc Oo Fl e enctype Oc \
Oo Fl Fl enctype= Ns Ar enctype Oc
Removes the specified key or keys. Not specifying a
.Ar kvno
removes keys with any version number. Not specifying an
.Ar enctype
removes keys of any type.
.It Nm merge Oo Fl Fl copy-duplicates Oc Ar keytab-src Ar keytab-dest
An alias for the
.Nm copy
command.
.It Nm rename Ar from-principal Ar to-principal
Renames all entries for the
.Ar from-principal
in the keytab
.Ar from-principal
to
.Ar to-principal .
.It Nm purge Op Fl Fl age= Ns Ar age
Removes all old versions of a key for which there is a newer version
that is at least
.Ar age
(default one week) old.
Note that this does not update the KDC database.
The
.Xr kadmin 1
command has a
.Nm prune
command that can do this on the KDC side.
.El
.Sh ENVIRONMENT
.Bl -tag -width Ds
.It Ev KRB5_KTNAME
Specifies the default keytab.
.It Ev KRB5_CONFIG
The file name of
.Pa krb5.conf ,
the default being
.Pa /etc/krb5.conf .
.El
.Sh KEYTAB NAMING
The syntax for the value of the
.Ql KRB5_KTNAME
environment variable and
.Oo Fl k Ar keytab \*(Ba Xo
.Fl Fl keytab= Ns Ar keytab
.Xc
.Oc
options is
.Ql TYPE:name
where the TYPE is one of
.Ql FILE ,
.Ql HDBGET ,
.Ql HDB ,
or
.Ql ANY ,
and the name syntax is specific to the keytab type.
.Pp
For the FILE keytab type the name is the path to a file whose
format is the well-known keytab file format used by MIT Kerberos,
Heimdal, Java, and others.
.Pp
For the HDB and HDBGET keytab types the name syntax is
.Ql [<path>][:mkey=<path>]
where the first path is the path to the HDB and the second path
is the path to the master key file.
Note that to use the HDB and HDBGET keytab types in a program
linked with Heimdal libraries one first load the
.Ql libhdb
library and then register their keytab methods using
.Xr krb5_kt_register 3 .
Note also that
.Nm ktutil
does not load and register the HDB and HDBGET keytab types at
this time.
.Pp
The ANY keytab type name syntax is a sequence of other keytab
names (including their TYPE: prefix) separated by commas.
Note that there is no escape sequence for commas in keytab names.
.Sh SEE ALSO
.Xr kadmin 1
.Xr kinit 1
.Xr krb5_kt_register 3