Provided by: opendnssec-enforcer-sqlite3_2.1.12-2_amd64 
NAME
ods-kasp - OpenDNSSEC kasp specification
SYNOPSIS
/etc/opendnssec/kasp.xml
DESCRIPTION
The kasp file describes the parameters of the DNSSEC Key and Signing Policy (KASP), the
policy used to sign zones. Each policy comprises a series of parameters that define the
way the zone is signed.
KASP Parameters
A policy has a set of common parameters to identify the policy.
Policy Name
The name is used to link a policy to a zone that needs to be signed. Each policy
must have a unique name. The policy named "default" is special, as it is associated
with all zones that do not have a policy explicitly associated with them.
Policy Description
A policy can have a description associated with it.
Signatures Parameters
This section lists the parameters for the signatures created using the policy.
Signature Resign Interval
This is the interval between runs of the signer. For example, a zone that has a Re-
sign Interval of PT2H (2 hours) is handled by the signer every 2 hours.
Signature Refresh Interval
The Refresh Interval is describing when a signature should be refreshed. As
signatures are typically valid for much longer than the interval between runs of
the signer, there is no need to regenerate the signatures each time the signer is
running. This means that the Re-sign Interval must be smaller than the Refresh
Interval. In order to make refreshing signatures possible, the Re-sign Interval
should be at least half of the Refresh Interval. In the case a signer runs and
detects that there is no change to the data being signed, signatures may be
refreshed. A signature will be refreshed when the time until the signature
expiration is closer than the Refresh Interval.
Signature Validity
The Signature Validity describes how long the signatures are valid for. This
parameter groups two elements of information. The Default Signature Validity is the
validity interval for all RRSIG records except those related to NSEC or NSEC3
records. For these records, the validity period is given by the value of the Denial
Signature Validity.
Signature Jitter
The Signature Jitter (j) is the value added to or subtracted from the expiration
time of signatures to ensure that not all signatures expire at the same time. The
actual value of the jitter is a random value, uniformly ranging between Minus
Signature Jitter and Signature Jitter [-j...j]. This value is added to Signature
Validity to determine the signature expiration time.
Signature Inception Offset
This is a duration subtracted from the time at which a record is signed to give the
inception time of the RRSIG record. This is required to allow for clock skew
between the signing system and the system on which the signature is checked.
Without it, the possibility exists that the checking system could retrieve a
signature whose start time is later than the current time. The relationship between
these elements is shown below in Figure 1.
Inception Signing Expiration
time time time
| | | | |
|---------------------|---------------------------|.......|.......|
| | | | |
[ +/- Jitter ]
| Inception offset | |
|<------------------->| Validity Interval |
| |<--------------------------------->|
Inception Signing reuse reuse new Expiration
time time signature time
| | | | | |
|---------------------|-----------------------------------|
| | | | | |
<-----> <-----> <----->
Re-sign Interval
|Refresh Interval|
|<-------------->|
| |
Figure 1: Signature Timing Parameters
Authenticated Denial of Existence Parameters
Authenticated denial of existence - proving that domain names do not exist in the
zone - is discussed in this section. Below, the list of the parameters is given
for creating NSEC or NSEC3 records using the policy.
NSEC or NSEC3
If the NSEC scheme is used to implement authenticated denial of existence, there
are no record elements we can tune. If NSEC3 [RFC5155] is used, there are some more
options.
NSEC3 Opt-Out
Whether to enable or disable "opt-out". This is an optimisation that means that
NSEC3 records are only created for authoritative data or for secure delegations;
insecure delegations have no NSEC3 records. For zones where a majority of the
entries are delegations that are not signed - typically TLDs during the take-up
phase of DNSSEC - this reduces the number of DNSSEC records in the zone.
NSEC3 Re-salt Interval
The is the interval between generating new salt values for the hashing algorithm.
NSEC3 Hash Parameters
The NSEC3 Hash Parameters tells parameters related to NSEC3.
NSEC3 Hash Algorithm
The NSEC3 Hash Algorithm tells what hashing algorithm should be used to create the
NSEC3 records.
NSEC3 Hash Iterations
The NSEC3 Hash Iterations shows how many iterations of the hash function should be
performed over the original owner name.
NSEC3 Hash Salt Length
The NSEC3 Hash Salt Length provides the length of the salt value to be generated.
Key Parameters
This section covers parameters related to keys. There are a number of parameters
relating to both zone-signing keys (ZSK) and key-signing keys (KSK).
DNSKEY TTL
This is the time-to-live value for the DNSKEY resource records.
Key Retire Safety
The Key Retire Safety is the retire safety margin for the keys. This interval is a
safety margin added to calculated timing values to ensure that keys are retired
without there being a chance of signatures created with the keys being considered
invalid.
Key Publish Safety
The Key Publish is the publish safety margins for the keys. This interval is the
safety margin added to calculated timing values to ensure that keys are published
and without there being a chance of signatures created with the keys being
considered invalid.
Key Sharing
If multiple zones are associated with a policy, a key may be shared between zones.
For example, if you have 100 zones then you will only use one set of keys instead
of 100 sets. This will safe space in your HSM.
Key Purging Interval
Key Purging is the event where keys marked as dead (as defined by draft-ietf-dnsop-
dnssec- key-timing [key-timing]) will be automatically purged from the key
database. The Key Purging Interval is the interval of when Key Purging is done.
KSK Parameters
There are parameters specific for the KSK.
KSK Algorithm
The KSK Algorithm determines the algorithm used for KSKs.
KSK Lifetime
The KSK Lifetime determines how long the KSK is used for before it is must be
rolled.
KSK Repository
The KSK Repository determines the location of the KSKs.
Manual KSK Rollover
It may be desirable to force that a key rollover will only be initiated on the
command by the operator. Note that if KSK rollover is done automatically, there is
currently still a step for the KSK that needs manual intervention, where the
corresponding DS record for the key needs to be published to the parent before the
rollover is completed.
ZSK Parameters
The same parameters for the KSK are available for the ZSK. The split between the
series of parameters is that with a ZSK/KSK Split Signing Scheme, the values for
the parameters may be different.
ZSK Algorithm
The ZSK Algorithm determines the algorithm used for ZSKs.
ZSK Lifetime
The ZSK Lifetime determines how long the ZSK is used for before it is must be
rolled.
ZSK Repository
The ZSK Repository determines the location of the ZSKs.
Manual ZSK Rollover
The ZSK rollover will be fully automatic if Manual ZSK Rollover is disabled.
Zone Parameters
General information concerning the zones is described here.
Propagation Delay
The Propagation Delay is the amount of time needed for information changes at the
master server for the zone to work its way through to all the secondary
nameservers.
SOA Parameters
These parameters are necessary for maintaining the SOA record in the signed zone.
These values will override values set for the SOA record in the input zone.
SOA TTL
This is the time-to-live of the SOA record.
SOA MINIMUM
This is value for the MINIMUM RDATA element in the SOA record.
SOA Serial
This represents the format of the serial number in the signed zone. This is one of
the following:
counter: Use an increasing counter (but use the serial from the unsigned zone
if possible).
datecounter: Use increasing counter in YYYYMMDDxx format (xx is the number of
increments within each day, starting at 00).
unixtime: The serial number is set to the "Unix time" (seconds since 00:00 on
1 January 1970 (UTC)) at which the signer is run.
keep: Keep the serial from the unsigned zone (do not re-sign unless it has been
incremented). This way, no signed zone is created unless the zone
operator
explicitly initiated a zone update.
Parent Zone Parameters
If a DNSSEC zone is in a chain of trust, digest information about the KSKs used in
the zone will be stored in DS records in the parent zone. To properly roll keys,
timing information about the parent zone must be configured.
Propagation Delay
The Propagation Delay parameter related to the parent zone is the interval between
the time a new KSK is published in the zone and the time that the DS record appears
in the parent zone. In reality, this is a variable value. The value for the
Propagation Delay in the policy should be a estimate.
DS TTL This represents the DS time-to-live. The DS TTL should be set to the TTL of the DS
record in the parent zone.
SOA Parameters
The SOA Parameters related to the parent zone gives information about the parent's
SOA record. These are necessary to calculate the timings in particular rollover
scenarios.
SOA TTL
This should be set to the time-to-live of the parent zone SOA record.
SOA MINIMUM
This should be set to the value of the MINIMUM RDATA element in the parent zone SOA
record.
SEE ALSO
ods-control(8), ods-enforcerd(8), ods-enforcer(8), ods-signerd(8), pds-signer(8),
ods-ksmutil(1), ods-kaspcheck(1), ods-timing(5), ods-hsmutil(1), ods-hsmspeed(1),
opendnssec(7), ISO 8601, http://www.opendnssec.org/
AUTHORS
OpenDNSSEC was written by NLnet Labs as part of the OpenDNSSEC project.
http://www.opendnssec.org/