dnssec-keymgr

dnssec-keymgr
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Name

dnssec-keymgr — Ensures correct DNSKEY coverage for a zone based on a defined policy

Synopsis

dnssec-keymgr [-K directory] [-c file] [-f] [-k] [-q] [-v] [-z] [-g path] [-s path] [zone...]

DESCRIPTION

dnssec-keymgr is a high level Python wrapper to facilitate the key rollover process for zones handled by BIND. It uses the BIND commands for manipulating DNSSEC key metadata: dnssec-keygen and dnssec-settime.

DNSSEC policy can be read from a configuration file (default /etc/dnssec-policy.conf), from which the key parameters, publication and rollover schedule, and desired coverage duration for any given zone can be determined. This file may be used to define individual DNSSEC policies on a per-zone basis, or to set a "default" policy used for all zones.

When dnssec-keymgr runs, it examines the DNSSEC keys for one or more zones, comparing their timing metadata against the policies for those zones. If key settings do not conform to the DNSSEC policy (for example, because the policy has been changed), they are automatically corrected.

A zone policy can specify a duration for which we want to ensure the key correctness (coverage). It can also specify a rollover period (roll-period). If policy indicates that a key should roll over before the coverage period ends, then a successor key will automatically be created and added to the end of the key series.

If zones are specified on the command line, dnssec-keymgr will examine only those zones. If a specified zone does not already have keys in place, then keys will be generated for it according to policy.

If zones are not specified on the command line, then dnssec-keymgr will search the key directory (either the current working directory or the directory set by the -K option), and check the keys for all the zones represented in the directory.

Key times that are in the past will not be updated unless the -f is used (see below). Key inactivation and deletion times that are less than five minutes in the future will be delayed by five minutes.

It is expected that this tool will be run automatically and unattended (for example, by cron).

OPTIONS

-c file: If -c is specified, then the DNSSEC policy is read from file. (If not specified, then the policy is read from /etc/dnssec-policy.conf; if that file doesn't exist, a built-in global default policy is used.)
-f: Force: allow updating of key events even if they are already in the past. This is not recommended for use with zones in which keys have already been published. However, if a set of keys has been generated all of which have publication and activation dates in the past, but the keys have not been published in a zone as yet, then this option can be used to clean them up and turn them into a proper series of keys with appropriate rollover intervals.
-g keygen-path: Specifies a path to a dnssec-keygen binary. Used for testing. See also the -s option.
-h: Print the dnssec-keymgr help summary and exit.
-K directory: Sets the directory in which keys can be found. Defaults to the current working directory.
-k: Only apply policies to KSK keys. See also the -z option.
-q: Quiet: suppress printing of dnssec-keygen and dnssec-settime.
-s settime-path: Specifies a path to a dnssec-settime binary. Used for testing. See also the -g option.
-v: Print the dnssec-keymgr version and exit.
-z: Only apply policies to ZSK keys. See also the -k option.

POLICY CONFIGURATION

The dnssec-policy.conf file can specify three kinds of policies:

Policy classes (policy name { ... };) can be inherited by zone policies or other policy classes; these can be used to create sets of different security profiles. For example, a policy class normal might specify 1024-bit key sizes, but a class extra might specify 2048 bits instead; extra would be used for zones that had unusually high security needs.
Algorithm policies: (algorithm-policy algorithm { ... }; ) override default per-algorithm settings. For example, by default, RSASHA256 keys use 2048-bit key sizes for both KSK and ZSK. This can be modified using algorithm-policy, and the new key sizes would then be used for any key of type RSASHA256.
Zone policies: (zone name { ... }; ) set policy for a single zone by name. A zone policy can inherit a policy class by including a policy option. Zone names beginning with digits (i.e., 0-9) must be quoted. If a zone does not have its own policy then the "default" policy applies.

Options that can be specified in policies:

algorithm name;: The key algorithm. If no policy is defined, the default is RSASHA256.
coverage duration;: The length of time to ensure that keys will be correct; no action will be taken to create new keys to be activated after this time. This can be represented as a number of seconds, or as a duration using human-readable units (examples: "1y" or "6 months"). A default value for this option can be set in algorithm policies as well as in policy classes or zone policies. If no policy is configured, the default is six months.
directory path;: Specifies the directory in which keys should be stored.
key-size keytype size;: Specifies the number of bits to use in creating keys. The keytype is either "zsk" or "ksk". A default value for this option can be set in algorithm policies as well as in policy classes or zone policies. If no policy is configured, the default is 2048 bits for RSA keys.
keyttl duration;: The key TTL. If no policy is defined, the default is one hour.
post-publish keytype duration;: How long after inactivation a key should be deleted from the zone. Note: If roll-period is not set, this value is ignored. The keytype is either "zsk" or "ksk". A default duration for this option can be set in algorithm policies as well as in policy classes or zone policies. The default is one month.
pre-publish keytype duration;: How long before activation a key should be published. Note: If roll-period is not set, this value is ignored. The keytype is either "zsk" or "ksk". A default duration for this option can be set in algorithm policies as well as in policy classes or zone policies. The default is one month.
roll-period keytype duration;: How frequently keys should be rolled over. The keytype is either "zsk" or "ksk". A default duration for this option can be set in algorithm policies as well as in policy classes or zone policies. If no policy is configured, the default is one year for ZSKs. KSKs do not roll over by default.
standby keytype number;: Not yet implemented.

REMAINING WORK

Enable scheduling of KSK rollovers using the -P sync and -D sync options to dnssec-keygen and dnssec-settime. Check the parent zone (as in dnssec-checkds) to determine when it's safe for the key to roll.
Allow configuration of standby keys and use of the REVOKE bit, for keys that use RFC 5011 semantics.

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