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Perform a Double Signature ZSK Rollover

Published: October 7, 2009

Updated: October 7, 2009

Applies To: Windows Server 2008 R2

TipTip
This topic applies to DNSSEC in Windows Server 2008 R2. DNSSEC support is greatly enhanced in Windows Server 2012. For more information, see DNSSEC in Windows Server 2012.

Use the following procedure to perform a double signature ZSK rollover.

Membership in the Administrators group, or equivalent, is the minimum required to complete this procedure. Review details about using the appropriate accounts and group memberships at Local and Domain Default Groups (http://go.microsoft.com/fwlink/?LinkId=83477).

In this procedure, ZSK1 and KSK1 denote the keys that are currently used to sign the zone. ZSK2 and KSK2 denote the new keys that will be generated using this procedure. All signing operations must continue to use KSK1 to sign the records at the apex in addition to the appropriate ZSK.

 

Step Description Command

Step 0

The zone has been signed with ZSK1 and KSK1.

For more information, see Sign a Zone File.

The zone has been signed with a specified validity period (using /ValidFrom and /ValidTo).

Step 1

Generate the new key, ZSK2.

For more information, see Generate Key Pairs.

DnsCmd /OfflineSign /GenKey

Step 2

Identify the maximum zone TTL (MaxZone_TTL).

Step 3

Re-sign the zone with ZSK1 and ZSK2 in addition to KSK1 to generate two sets of signatures.

For an example, see Zone signing commands.

DnsCmd /OfflineSign /SignZone

Use /signkey three times, once each with ZSK1, ZSK2, and KSK1.

Step 4

After re-signing, wait for a period of time equal to the MaxZone_TTL value.

Step 5

Re-sign the zone with KSK1 and ZSK2. This will automatically delete ZSK1 and all signatures that were generated using ZSK1.

For an example, see Zone signing commands.

DnsCmd /OfflineSign /SignZone

Use /signkey twice, once with ZSK2 and once with KSK1.

Use /ValidFrom and /ValidTo parameters to specify the validity period for ZSK2.

The following are example zone signing commands used when performing a double-signature ZSK rollover.

  • Step 3: Re-sign the zone with KSK1 and ZSK1, adding ZSK2:

    DnsCmd /OfflineSign /SignZone /input <input zone file> /output <output zone file> /zone <zone name> /signkey /cert /friendlyname ksk1-<zone name> /signkey /cert /friendlyname zsk1-<zone name> /signkey /cert /friendlyname zsk2-<zone name>
    
  • Step 5: Re-sign the zone with KSK1 and ZSK2, providing a new ZSK validity period:

    DnsCmd /OfflineSign /SignZone /input <input zone file> /output <output zone file> /zone <zone name> /signkey /cert /friendlyname ksk1-<zone name> /signkey /ValidTo <validtodate> /ValidFrom <validfromdate> /cert /friendlyname zsk2-<zone name>
    

 

Value Description

dnscmd

The command-line tool for managing DNS servers.

/OfflineSign

Required. Used with the GenKey, DeleteKey, ImportKey, or SignZone commands to modify certificates and keys or to sign a zone file.

/SignZone

Required. Used to sign a zone file.

/input

Required. Used with <input filename> to designate the zone file to be signed.

<input filename>

Required. The file name of the zone file to be signed.

/output

Required. Used with <output filename> to designate the name of the zone file after it has been signed.

<output filename>

Required. The file name of the signed zone.

/Zone

Required. Used with <zone name> to specify the fully qualified domain name (FQDN) of the zone.

<zone name>

Required. The FQDN of the zone.

/Signkey

Required. Specifies the key that will be used to sign the zone.

/Addkey

Optional. Specifies the key will be added to the zone, but will not be used to sign the zone.

/ValidFrom

Optional. Used with <validfromdate> to specify the start time of the validity period of RRSIG records created using this key. If not specified, the validity period will start one hour prior to the current UTC time.

<validfromdate>

Optional. Specifies the UTC start time of the validity period in YYYYMMDDHHMMSS format.

/ValidTo

Optional. Used with <validtodate> to specify the end time of the validity period of RRSIG records created using this key. If not specified, the validity period will end 30 days from the start of the validity period for zone signing keys or 13 months from the start of the validity period for key signing keys.

<validtodate>

Optional. Specifies the UTC end time of the validity period in YYYYMMDDHHMMSS format.

/Cert

Required. Specifies that keys are stored in a certificate.

/FriendlyName

Used with KSK-<zone name> or ZSK-<zone name> to specify the friendly name of the self-signed certificate.

KSK1-<zone name>

Specifies the friendly name of the self-signed certificate used with the existing KSK prior to rollover.

ZSK1-<zone name>

Specifies the friendly name of the self-signed certificate used with the existing ZSK prior to rollover.

ZSK2-<zone name>

Specifies the friendly name of the self-signed certificate used with the new ZSK that will be used following rollover.

See Also

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