NAME

       dnssec-coverage - checks future DNSKEY coverage for a zone

SYNOPSIS

       dnssec-coverage  [-Kdirectory] [-llength] [-ffile] [-dDNSKEY TTL] [-mmax TTL] [-rinterval]
       [-ccompilezone path] [-k] [-z] [zone...]

DESCRIPTION

       dnssec-coverage verifies that the DNSSEC keys for a given zone or  a  set  of  zones  have
       timing metadata set properly to ensure no future lapses in DNSSEC coverage.

       If  zone  is  specified,  then  keys  found  in  the key repository matching that zone are
       scanned, and an ordered list is generated of the events  scheduled  for  that  key  (i.e.,
       publication, activation, inactivation, deletion). The list of events is walked in order of
       occurrence. Warnings are generated if any event is scheduled which could cause the zone to
       enter  a  state  in  which  validation failures might occur: for example, if the number of
       published or active keys for a given algorithm drops to zero, or if a key is deleted  from
       the  zone  too soon after a new key is rolled, and cached data signed by the prior key has
       not had time to expire from resolver caches.

       If zone is not specified, then all keys in the key repository will  be  scanned,  and  all
       zones  for which there are keys will be analyzed.  (Note: This method of reporting is only
       accurate if all the zones that have  keys  in  a  given  repository  share  the  same  TTL
       parameters.)

OPTIONS

       -K directory
          Sets  the  directory  in  which  keys  can  be  found.  Defaults to the current working
          directory.

       -f file
          If a file is specified, then the zone is read from that file; the largest TTL  and  the
          DNSKEY TTL are determined directly from the zone data, and the -m and -d options do not
          need to be specified on the command line.

       -l duration
          The length of time to check for DNSSEC coverage. Key events scheduled further into  the
          future than duration will be ignored, and assumed to be correct.

          The  value  of  duration  can be set in seconds, or in larger units of time by adding a
          suffix: mi for minutes, h for hours, d for days, w for weeks,  mo  for  months,  y  for
          years.

       -m maximum TTL
          Sets  the value to be used as the maximum TTL for the zone or zones being analyzed when
          determining whether there is a possibility of validation failure. When  a  zone-signing
          key  is  deactivated,  there  must  be  enough time for the record in the zone with the
          longest TTL to have expired from resolver caches before that key can be purged from the
          DNSKEY RRset. If that condition does not apply, a warning will be generated.

          The  length  of  the  TTL can be set in seconds, or in larger units of time by adding a
          suffix: mi for minutes, h for hours, d for days, w for weeks,  mo  for  months,  y  for
          years.

          This  option is not necessary if the -f has been used to specify a zone file. If -f has
          been specified, this option may still be used; it will override the value found in  the
          file.

          If  this option is not used and the maximum TTL cannot be retrieved from a zone file, a
          warning is generated and a default value of 1 week is used.

       -d DNSKEY TTL
          Sets the value to be used as the DNSKEY TTL for the zone or zones being  analyzed  when
          determining  whether there is a possibility of validation failure. When a key is rolled
          (that is, replaced with a new key), there must be enough time for the old DNSKEY  RRset
          to  have  expired  from  resolver  caches  before  the  new key is activated and begins
          generating signatures. If that condition does not apply, a warning will be generated.

          The length of the TTL can be set in seconds, or in larger units of  time  by  adding  a
          suffix:  mi  for  minutes,  h  for hours, d for days, w for weeks, mo for months, y for
          years.

          This option is not necessary if -f has been used to specify a zone file from which  the
          TTL  of  the DNSKEY RRset can be read, or if a default key TTL was set using ith the -L
          to dnssec-keygen. If either of those is true, this option may still be  used;  it  will
          override the values found in the zone file or the key file.

          If  this  option  is not used and the key TTL cannot be retrieved from the zone file or
          the key file, then a warning is generated and a default value of 1 day is used.

       -r resign interval
          Sets the value to be used as the resign interval for the zone or zones  being  analyzed
          when  determining  whether  there  is  a  possibility of validation failure. This value
          defaults to 22.5 days, which is also the default in named.  However,  if  it  has  been
          changed  by  the  sig-validity-interval  option  in  named.conf, then it should also be
          changed here.

          The length of the interval can be set in seconds, or in larger units of time by  adding
          a  suffix:  mi  for minutes, h for hours, d for days, w for weeks, mo for months, y for
          years.

       -k
          Only check KSK coverage; ignore ZSK events. Cannot be used with -z.

       -z
          Only check ZSK coverage; ignore KSK events. Cannot be used with -k.

       -c compilezone path
          Specifies a path to a named-compilezone binary. Used for testing.

SEE ALSO

       dnssec-checkds(8), dnssec-dsfromkey(8), dnssec-keygen(8), dnssec-signzone(8)

AUTHOR

       Internet Systems Consortium

COPYRIGHT

       2021, Internet Systems Consortium