.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
..
.. SPDX-License-Identifier: MPL-2.0
..
.. This Source Code Form is subject to the terms of the Mozilla Public
.. License, v. 2.0.  If a copy of the MPL was not distributed with this
.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
..
.. See the COPYRIGHT file distributed with this work for additional
.. information regarding copyright ownership.

.. highlight: console

.. iscman:: dnssec-keyfromlabel
.. program:: dnssec-keyfromlabel
.. _man_dnssec-keyfromlabel:

dnssec-keyfromlabel - DNSSEC key generation tool
------------------------------------------------

Synopsis
~~~~~~~~

:program:`dnssec-keyfromlabel` {**-l** label} [**-3**] [**-a** algorithm] [**-A** date/offset] [**-c** class] [**-D** date/offset] [**-D** sync date/offset] [**-f** flag] [**-G**] [**-I** date/offset] [**-i** interval] [**-k**] [**-K** directory] [**-L** ttl] [**-M** tag_min:tag_max] [**-P** date/offset] [**-P** sync date/offset] [**-p** protocol] [**-R** date/offset] [**-S** key] [**-v** level] [**-V**] [**-y**] {name}

Description
~~~~~~~~~~~

:program:`dnssec-keyfromlabel` generates a pair of key files that reference a
key object stored in a cryptographic hardware service module (HSM). The
private key file can be used for DNSSEC signing of zone data as if it
were a conventional signing key created by :iscman:`dnssec-keygen`, but the
key material is stored within the HSM and the actual signing takes
place there.

The ``name`` of the key is specified on the command line. This must
match the name of the zone for which the key is being generated.

Options
~~~~~~~

.. option:: -a algorithm

   This option selects the cryptographic algorithm. The value of
   ``algorithm`` must be one of RSASHA1 (deprecated), NSEC3RSASHA1
   (deprecated), RSASHA256, RSASHA512, ECDSAP256SHA256, ECDSAP384SHA384,
   ED25519, or ED448.

   These values are case-insensitive. In some cases, abbreviations
   are supported, such as ECDSA256 for ECDSAP256SHA256 and ECDSA384
   for ECDSAP384SHA384. If RSASHA1 (deprecated) is specified along
   with the :option:`-3` option, then NSEC3RSASHA1 (deprecated) is
   used instead.

   This option is mandatory except when using the :option:`-S`
   option, which copies the algorithm from the predecessory key.

   .. versionchanged:: 9.12.0
      The default value RSASHA1 (deprecated) for newly generated
      keys was removed.

.. option:: -3

   This option uses an NSEC3-capable algorithm to generate a DNSSEC
   key. If this option is used with an algorithm that has both NSEC
   and NSEC3 versions, then the NSEC3 version is used; for example,
   ``dnssec-keygen -3a RSASHA1`` specifies the NSEC3RSASHA1
   (deprecated) algorithm.

.. option:: -l label

   This option specifies the label for a key pair in the crypto hardware.

   When BIND 9 is built with OpenSSL-based PKCS#11 support, the label is
   an arbitrary string that identifies a particular key.

.. option:: -C

   This option enables compatibility mode, which generates an old-style key, without any metadata.
   By default, :program:`dnssec-keyfromlabel` includes the key's creation
   date in the metadata stored with the private key; other dates may
   be set there as well, including publication date, activation date, etc. Keys
   that include this data may be incompatible with older versions of
   BIND; the :option:`-C` option suppresses them.

.. option:: -c class

   This option indicates that the DNS record containing the key should have the
   specified class. If not specified, class IN is used.

.. option:: -f flag

   This option sets the specified flag in the ``flag`` field of the KEY/DNSKEY record.
   The only recognized flags are KSK (Key-Signing Key) and REVOKE.

.. option:: -G

   This option generates a key, but does not publish it or sign with it. This option is
   incompatible with :option:`-P` and :option:`-A`.

.. option:: -h

   This option prints a short summary of the options and arguments to
   :program:`dnssec-keyfromlabel`.

.. option:: -K directory

   This option sets the directory in which the key files are to be written.

.. option:: -k

   This option generates KEY records rather than DNSKEY records.

.. option:: -L ttl

   This option sets the default TTL to use for this key when it is converted into a
   DNSKEY RR. This is the TTL used when the key is imported into a zone,
   unless there was already a DNSKEY RRset in
   place, in which case the existing TTL would take precedence. Setting
   the default TTL to ``0`` or ``none`` removes it.

.. option:: -M tag_min:tag_max

   This option sets the range of key tag values
   that ``dnssec-keyfromlabel`` will accept. If the key tag of the new
   key or the key tag of the revoked version of the new key is
   outside this range, the new key will be rejected.  This is
   designed to be used when generating keys in a multi-signer
   scenario, where each operator is given a range of key tags to
   prevent collisions among different operators.  The valid
   values for ``tag_min`` and ``tag_max`` are [0..65535].  The
   default allows all key tag values to be accepted.

.. option:: -S key

   This option generates a key as an explicit successor to an existing key. The name,
   algorithm, size, and type of the key are set to match the
   predecessor. The activation date of the new key is set to the
   inactivation date of the existing one. The publication date is
   set to the activation date minus the prepublication interval, which
   defaults to 30 days.

.. option:: -v level

   This option sets the debugging level.

.. option:: -V

   This option prints version information.

.. option:: -y

   This option allows DNSSEC key files to be generated even if the key ID would
   collide with that of an existing key, in the event of either key
   being revoked. (This is only safe to enable if
   :rfc:`5011` trust anchor maintenance is not used with either of the keys
   involved.)

Timing Options
~~~~~~~~~~~~~~

Dates can be expressed in the format YYYYMMDD or YYYYMMDDHHMMSS
(which is the format used inside key files),
or 'Day Mon DD HH:MM:SS YYYY' (as printed by ``dnssec-settime -p``),
or UNIX epoch time (as printed by ``dnssec-settime -up``),
or the literal ``now``.

The argument can be followed by ``+`` or ``-`` and an offset from the
given time. The literal ``now`` can be omitted before an offset. The
offset can be followed by one of the suffixes ``y``, ``mo``, ``w``,
``d``, ``h``, or ``mi``, so that it is computed in years (defined as
365 24-hour days, ignoring leap years), months (defined as 30 24-hour
days), weeks, days, hours, or minutes, respectively. Without a suffix,
the offset is computed in seconds.

To explicitly prevent a date from being set, use ``none``, ``never``,
or ``unset``.

All these formats are case-insensitive.

.. option:: -P date/offset

   This option sets the date on which a key is to be published to the zone. After
   that date, the key is included in the zone but is not used
   to sign it. If not set, and if the :option:`-G` option has not been used, the
   default is the current date.

   .. program:: dnssec-keyfromlabel -P
   .. option:: sync date/offset

      This option sets the date on which CDS and CDNSKEY records that match this key
      are to be published to the zone.

.. program:: dnssec-keyfromlabel

.. option:: -A date/offset

   This option sets the date on which the key is to be activated. After that date,
   the key is included in the zone and used to sign it. If not set,
   and if the :option:`-G` option has not been used, the default is the current date.

.. option:: -R date/offset

   This option sets the date on which the key is to be revoked. After that date, the
   key is flagged as revoked. It is included in the zone and
   is used to sign it.

.. option:: -I date/offset

   This option sets the date on which the key is to be retired. After that date, the
   key is still included in the zone, but it is not used to
   sign it.

.. option:: -D date/offset

   This option sets the date on which the key is to be deleted. After that date, the
   key is no longer included in the zone. (However, it may remain in the key
   repository.)

   .. program:: dnssec-keyfromlabel -D
   .. option:: sync date/offset

      This option sets the date on which the CDS and CDNSKEY records that match this
      key are to be deleted.

.. program:: dnssec-keyfromlabel

.. option:: -i interval

   This option sets the prepublication interval for a key. If set, then the
   publication and activation dates must be separated by at least this
   much time. If the activation date is specified but the publication
   date is not, the publication date defaults to this much time
   before the activation date; conversely, if the publication date is
   specified but not the activation date, activation is set to
   this much time after publication.

   If the key is being created as an explicit successor to another key,
   then the default prepublication interval is 30 days; otherwise it is
   zero.

   As with date offsets, if the argument is followed by one of the
   suffixes ``y``, ``mo``, ``w``, ``d``, ``h``, or ``mi``, the interval is
   measured in years, months, weeks, days, hours, or minutes,
   respectively. Without a suffix, the interval is measured in seconds.

Generated Key Files
~~~~~~~~~~~~~~~~~~~

When :program:`dnssec-keyfromlabel` completes successfully, it prints a string
of the form ``Knnnn.+aaa+iiiii`` to the standard output. This is an
identification string for the key files it has generated.

-  ``nnnn`` is the key name.

-  ``aaa`` is the numeric representation of the algorithm.

-  ``iiiii`` is the key identifier (or footprint).

:program:`dnssec-keyfromlabel` creates two files, with names based on the
printed string. ``Knnnn.+aaa+iiiii.key`` contains the public key, and
``Knnnn.+aaa+iiiii.private`` contains the private key.

The ``.key`` file contains a DNS KEY record that can be inserted into a
zone file (directly or with an $INCLUDE statement).

The ``.private`` file contains algorithm-specific fields. For obvious
security reasons, this file does not have general read permission.

See Also
~~~~~~~~

:iscman:`dnssec-keygen(8) <dnssec-keygen>`, :iscman:`dnssec-signzone(8) <dnssec-signzone>`, BIND 9 Administrator Reference Manual,
:rfc:`4034`, :rfc:`7512`.
