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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 07:24:22 +0000
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+.. 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
+
+.. _man_dnssec-signzone:
+
+dnssec-signzone - DNSSEC zone signing tool
+------------------------------------------
+
+Synopsis
+~~~~~~~~
+
+:program:`dnssec-signzone` [**-a**] [**-c** class] [**-d** directory] [**-D**] [**-E** engine] [**-e** end-time] [**-f** output-file] [**-g**] [**-h**] [**-i** interval] [**-I** input-format] [**-j** jitter] [**-K** directory] [**-k** key] [**-L** serial] [**-M** maxttl] [**-N** soa-serial-format] [**-o** origin] [**-O** output-format] [**-P**] [**-Q**] [**-q**] [**-R**] [**-S**] [**-s** start-time] [**-T** ttl] [**-t**] [**-u**] [**-v** level] [**-V**] [**-X** extended end-time] [**-x**] [**-z**] [**-3** salt] [**-H** iterations] [**-A**] {zonefile} [key...]
+
+Description
+~~~~~~~~~~~
+
+``dnssec-signzone`` signs a zone; it generates NSEC and RRSIG records
+and produces a signed version of the zone. The security status of
+delegations from the signed zone (that is, whether the child zones are
+secure) is determined by the presence or absence of a ``keyset``
+file for each child zone.
+
+Options
+~~~~~~~
+
+``-a``
+ This option verifies all generated signatures.
+
+``-c class``
+ This option specifies the DNS class of the zone.
+
+``-C``
+ This option sets compatibility mode, in which a ``keyset-zonename`` file is generated in addition
+ to ``dsset-zonename`` when signing a zone, for use by older versions
+ of ``dnssec-signzone``.
+
+``-d directory``
+ This option indicates the directory where BIND 9 should look for ``dsset-`` or ``keyset-`` files.
+
+``-D``
+ This option indicates that only those record types automatically managed by
+ ``dnssec-signzone``, i.e., RRSIG, NSEC, NSEC3 and NSEC3PARAM records, should be included in the output.
+ If smart signing (``-S``) is used, DNSKEY records are also included.
+ The resulting file can be included in the original zone file with
+ ``$INCLUDE``. This option cannot be combined with ``-O raw``,
+ ``-O map``, or serial-number updating.
+
+``-E engine``
+ This option specifies the hardware to use for cryptographic
+ operations, such as a secure key store used for signing, when applicable.
+
+ When BIND 9 is built with OpenSSL, this needs to be set to the OpenSSL
+ engine identifier that drives the cryptographic accelerator or
+ hardware service module (usually ``pkcs11``). When BIND is
+ built with native PKCS#11 cryptography (``--enable-native-pkcs11``), it
+ defaults to the path of the PKCS#11 provider library specified via
+ ``--with-pkcs11``.
+
+``-g``
+ This option indicates that DS records for child zones should be generated from a ``dsset-`` or ``keyset-``
+ file. Existing DS records are removed.
+
+``-K directory``
+ This option specifies the directory to search for DNSSEC keys. If not
+ specified, it defaults to the current directory.
+
+``-k key``
+ This option tells BIND 9 to treat the specified key as a key-signing key, ignoring any key flags. This
+ option may be specified multiple times.
+
+``-M maxttl``
+ This option sets the maximum TTL for the signed zone. Any TTL higher than ``maxttl``
+ in the input zone is reduced to ``maxttl`` in the output. This
+ provides certainty as to the largest possible TTL in the signed zone,
+ which is useful to know when rolling keys. The maxttl is the longest
+ possible time before signatures that have been retrieved by resolvers
+ expire from resolver caches. Zones that are signed with this
+ option should be configured to use a matching ``max-zone-ttl`` in
+ ``named.conf``. (Note: This option is incompatible with ``-D``,
+ because it modifies non-DNSSEC data in the output zone.)
+
+``-s start-time``
+ This option specifies the date and time when the generated RRSIG records become
+ valid. This can be either an absolute or relative time. An absolute
+ start time is indicated by a number in YYYYMMDDHHMMSS notation;
+ 20000530144500 denotes 14:45:00 UTC on May 30th, 2000. A relative
+ start time is indicated by ``+N``, which is N seconds from the current
+ time. If no ``start-time`` is specified, the current time minus 1
+ hour (to allow for clock skew) is used.
+
+``-e end-time``
+ This option specifies the date and time when the generated RRSIG records expire. As
+ with ``start-time``, an absolute time is indicated in YYYYMMDDHHMMSS
+ notation. A time relative to the start time is indicated with ``+N``,
+ which is N seconds from the start time. A time relative to the
+ current time is indicated with ``now+N``. If no ``end-time`` is
+ specified, 30 days from the start time is the default.
+ ``end-time`` must be later than ``start-time``.
+
+``-X extended end-time``
+ This option specifies the date and time when the generated RRSIG records for the
+ DNSKEY RRset expire. This is to be used in cases when the DNSKEY
+ signatures need to persist longer than signatures on other records;
+ e.g., when the private component of the KSK is kept offline and the
+ KSK signature is to be refreshed manually.
+
+ As with ``end-time``, an absolute time is indicated in
+ YYYYMMDDHHMMSS notation. A time relative to the start time is
+ indicated with ``+N``, which is N seconds from the start time. A time
+ relative to the current time is indicated with ``now+N``. If no
+ ``extended end-time`` is specified, the value of ``end-time`` is used
+ as the default. (``end-time``, in turn, defaults to 30 days from the
+ start time.) ``extended end-time`` must be later than ``start-time``.
+
+``-f output-file``
+ This option indicates the name of the output file containing the signed zone. The default
+ is to append ``.signed`` to the input filename. If ``output-file`` is
+ set to ``-``, then the signed zone is written to the standard
+ output, with a default output format of ``full``.
+
+``-h``
+ This option prints a short summary of the options and arguments to
+ ``dnssec-signzone``.
+
+``-V``
+ This option prints version information.
+
+``-i interval``
+ This option indicates that, when a previously signed zone is passed as input, records may be
+ re-signed. The ``interval`` option specifies the cycle interval as an
+ offset from the current time, in seconds. If a RRSIG record expires
+ after the cycle interval, it is retained; otherwise, it is considered
+ to be expiring soon and it is replaced.
+
+ The default cycle interval is one quarter of the difference between
+ the signature end and start times. So if neither ``end-time`` nor
+ ``start-time`` is specified, ``dnssec-signzone`` generates
+ signatures that are valid for 30 days, with a cycle interval of 7.5
+ days. Therefore, if any existing RRSIG records are due to expire in
+ less than 7.5 days, they are replaced.
+
+``-I input-format``
+ This option sets the format of the input zone file. Possible formats are ``text``
+ (the default), ``raw``, and ``map``. This option is primarily
+ intended to be used for dynamic signed zones, so that the dumped zone
+ file in a non-text format containing updates can be signed directly.
+ This option is not useful for non-dynamic zones.
+
+``-j jitter``
+ When signing a zone with a fixed signature lifetime, all RRSIG
+ records issued at the time of signing expire simultaneously. If the
+ zone is incrementally signed, i.e., a previously signed zone is passed
+ as input to the signer, all expired signatures must be regenerated
+ at approximately the same time. The ``jitter`` option specifies a jitter
+ window that is used to randomize the signature expire time, thus
+ spreading incremental signature regeneration over time.
+
+ Signature lifetime jitter also, to some extent, benefits validators and
+ servers by spreading out cache expiration, i.e., if large numbers of
+ RRSIGs do not expire at the same time from all caches, there is
+ less congestion than if all validators need to refetch at around the
+ same time.
+
+``-L serial``
+ When writing a signed zone to "raw" or "map" format, this option sets the "source
+ serial" value in the header to the specified ``serial`` number. (This is
+ expected to be used primarily for testing purposes.)
+
+``-n ncpus``
+ This option specifies the number of threads to use. By default, one thread is
+ started for each detected CPU.
+
+``-N soa-serial-format``
+ This option sets the SOA serial number format of the signed zone. Possible formats are
+ ``keep`` (the default), ``increment``, ``unixtime``, and
+ ``date``.
+
+ **keep**
+ This format indicates that the SOA serial number should not be modified.
+
+ **increment**
+ This format increments the SOA serial number using :rfc:`1982` arithmetic.
+
+ **unixtime**
+ This format sets the SOA serial number to the number of seconds
+ since the beginning of the Unix epoch, unless the serial
+ number is already greater than or equal to that value, in
+ which case it is simply incremented by one.
+
+ **date**
+ This format sets the SOA serial number to today's date, in
+ YYYYMMDDNN format, unless the serial number is already greater
+ than or equal to that value, in which case it is simply
+ incremented by one.
+
+``-o origin``
+ This option sets the zone origin. If not specified, the name of the zone file is
+ assumed to be the origin.
+
+``-O output-format``
+ This option sets the format of the output file containing the signed zone. Possible
+ formats are ``text`` (the default), which is the standard textual
+ representation of the zone; ``full``, which is text output in a
+ format suitable for processing by external scripts; and ``map``,
+ ``raw``, and ``raw=N``, which store the zone in binary formats
+ for rapid loading by ``named``. ``raw=N`` specifies the format
+ version of the raw zone file: if N is 0, the raw file can be read by
+ any version of ``named``; if N is 1, the file can be read by release
+ 9.9.0 or higher. The default is 1.
+
+``-P``
+ This option disables post-sign verification tests.
+
+ The post-sign verification tests ensure that for each algorithm in
+ use there is at least one non-revoked self-signed KSK key, that all
+ revoked KSK keys are self-signed, and that all records in the zone
+ are signed by the algorithm. This option skips these tests.
+
+``-Q``
+ This option removes signatures from keys that are no longer active.
+
+ Normally, when a previously signed zone is passed as input to the
+ signer, and a DNSKEY record has been removed and replaced with a new
+ one, signatures from the old key that are still within their validity
+ period are retained. This allows the zone to continue to validate
+ with cached copies of the old DNSKEY RRset. The ``-Q`` option forces
+ ``dnssec-signzone`` to remove signatures from keys that are no longer
+ active. This enables ZSK rollover using the procedure described in
+ :rfc:`4641#4.2.1.1` ("Pre-Publish Key Rollover").
+
+``-q``
+ This option enables quiet mode, which suppresses unnecessary output. Without this option, when
+ ``dnssec-signzone`` is run it prints three pieces of information to standard output: the number of
+ keys in use; the algorithms used to verify the zone was signed correctly and
+ other status information; and the filename containing the signed
+ zone. With the option that output is suppressed, leaving only the filename.
+
+``-R``
+ This option removes signatures from keys that are no longer published.
+
+ This option is similar to ``-Q``, except it forces
+ ``dnssec-signzone`` to remove signatures from keys that are no longer
+ published. This enables ZSK rollover using the procedure described in
+ :rfc:`4641#4.2.1.2` ("Double Signature Zone Signing Key
+ Rollover").
+
+``-S``
+ This option enables smart signing, which instructs ``dnssec-signzone`` to search the key
+ repository for keys that match the zone being signed, and to include
+ them in the zone if appropriate.
+
+ When a key is found, its timing metadata is examined to determine how
+ it should be used, according to the following rules. Each successive
+ rule takes priority over the prior ones:
+
+ If no timing metadata has been set for the key, the key is
+ published in the zone and used to sign the zone.
+
+ If the key's publication date is set and is in the past, the key
+ is published in the zone.
+
+ If the key's activation date is set and is in the past, the key is
+ published (regardless of publication date) and used to sign the
+ zone.
+
+ If the key's revocation date is set and is in the past, and the key
+ is published, then the key is revoked, and the revoked key is used
+ to sign the zone.
+
+ If either the key's unpublication or deletion date is set and
+ in the past, the key is NOT published or used to sign the zone,
+ regardless of any other metadata.
+
+ If the key's sync publication date is set and is in the past,
+ synchronization records (type CDS and/or CDNSKEY) are created.
+
+ If the key's sync deletion date is set and is in the past,
+ synchronization records (type CDS and/or CDNSKEY) are removed.
+
+``-T ttl``
+ This option specifies a TTL to be used for new DNSKEY records imported into the
+ zone from the key repository. If not specified, the default is the
+ TTL value from the zone's SOA record. This option is ignored when
+ signing without ``-S``, since DNSKEY records are not imported from
+ the key repository in that case. It is also ignored if there are any
+ pre-existing DNSKEY records at the zone apex, in which case new
+ records' TTL values are set to match them, or if any of the
+ imported DNSKEY records had a default TTL value. In the event of a
+ conflict between TTL values in imported keys, the shortest one is
+ used.
+
+``-t``
+ This option prints statistics at completion.
+
+``-u``
+ This option updates the NSEC/NSEC3 chain when re-signing a previously signed zone.
+ With this option, a zone signed with NSEC can be switched to NSEC3,
+ or a zone signed with NSEC3 can be switched to NSEC or to NSEC3 with
+ different parameters. Without this option, ``dnssec-signzone``
+ retains the existing chain when re-signing.
+
+``-v level``
+ This option sets the debugging level.
+
+``-x``
+ This option indicates that BIND 9 should only sign the DNSKEY, CDNSKEY, and CDS RRsets with key-signing keys,
+ and should omit signatures from zone-signing keys. (This is similar to the
+ ``dnssec-dnskey-kskonly yes;`` zone option in ``named``.)
+
+``-z``
+ This option indicates that BIND 9 should ignore the KSK flag on keys when determining what to sign. This causes
+ KSK-flagged keys to sign all records, not just the DNSKEY RRset.
+ (This is similar to the ``update-check-ksk no;`` zone option in
+ ``named``.)
+
+``-3 salt``
+ This option generates an NSEC3 chain with the given hex-encoded salt. A dash
+ (-) can be used to indicate that no salt is to be used when
+ generating the NSEC3 chain.
+
+ .. note::
+ ``-3 -`` is the recommended configuration. Adding salt provides no practical benefits.
+
+``-H iterations``
+ This option indicates that, when generating an NSEC3 chain, BIND 9 should use this many iterations. The default
+ is 10.
+
+ .. warning::
+ Values greater than 0 cause interoperability issues and also increase the risk of CPU-exhausting DoS attacks. The default value has not been changed because the best practices has changed only after BIND 9.16 reached Extended Support Version status.
+
+``-A``
+ This option indicates that, when generating an NSEC3 chain, BIND 9 should set the OPTOUT flag on all NSEC3
+ records and should not generate NSEC3 records for insecure delegations.
+
+ .. warning::
+ Do not use this option unless all its implications are fully understood. This option is intended only for extremely large zones (comparable to ``com.``) with sparse secure delegations.
+
+ Using this option twice (i.e., ``-AA``) turns the OPTOUT flag off for
+ all records. This is useful when using the ``-u`` option to modify an
+ NSEC3 chain which previously had OPTOUT set.
+
+``zonefile``
+ This option sets the file containing the zone to be signed.
+
+``key``
+ This option specifies which keys should be used to sign the zone. If no keys are
+ specified, the zone is examined for DNSKEY records at the
+ zone apex. If these records are found and there are matching private keys in
+ the current directory, they are used for signing.
+
+Example
+~~~~~~~
+
+The following command signs the ``example.com`` zone with the
+ECDSAP256SHA256 key generated by ``dnssec-keygen``
+(Kexample.com.+013+17247). Because the ``-S`` option is not being used,
+the zone's keys must be in the master file (``db.example.com``). This
+invocation looks for ``dsset`` files in the current directory, so that
+DS records can be imported from them (``-g``).
+
+::
+
+ % dnssec-signzone -g -o example.com db.example.com \
+ Kexample.com.+013+17247
+ db.example.com.signed
+ %
+
+In the above example, ``dnssec-signzone`` creates the file
+``db.example.com.signed``. This file should be referenced in a zone
+statement in the ``named.conf`` file.
+
+This example re-signs a previously signed zone with default parameters.
+The private keys are assumed to be in the current directory.
+
+::
+
+ % cp db.example.com.signed db.example.com
+ % dnssec-signzone -o example.com db.example.com
+ db.example.com.signed
+ %
+
+See Also
+~~~~~~~~
+
+:manpage:`dnssec-keygen(8)`, BIND 9 Administrator Reference Manual, :rfc:`4033`,
+:rfc:`4641`.