Name
dnssec-dsfromkey — DNSSEC DS RR generation tool
Synopsis
dnssec-dsfromkey [ -1 | -2 | -a alg ] [ -C | -l domain ] [-T TTL] [-v level] [-K directory] {keyfile}
dnssec-dsfromkey [ -1 | -2 | -a alg ] [ -C | -l domain ] [-T TTL] [-v level] [-c class] [-A] {-f file} [dnsname]
dnssec-dsfromkey [ -1 | -2 | -a alg ] [ -C | -l domain ] [-T TTL] [-v level] [-c class] [-K directory] {-s} {dnsname}
dnssec-dsfromkey [ -h | -V ]
DESCRIPTION
The dnssec-dsfromkey command outputs DS (Delegation
Signer) resource records (RRs) and other similarly-constructed RRs:
with the -l option it outputs DLV (DNSSEC Lookaside
Validation) RRs; or with the -C it outputs CDS (Child
DS) RRs.
The input keys can be specified in a number of ways:
By default, dnssec-dsfromkey reads a key file
named like Knnnn.+aaa+iiiii.key, as generated
by dnssec-keygen.
With the -f file
option, dnssec-dsfromkey reads keys from a zone file
or partial zone file (which can contain just the DNSKEY records).
With the -s
option, dnssec-dsfromkey reads
a keyset- file, as generated
by dnssec-keygen -C.
OPTIONS
- -1
An abbreviation for -a SHA1
- -2
An abbreviation for -a SHA-256
- -a
algorithm
-
Specify a digest algorithm to use when converting DNSKEY
records to DS records. This option can be repeated, so
that multiple DS records are created for each DNSKEY
record.
The algorithm must be one of
SHA-1, SHA-256, or SHA-384. These values are case insensitive,
and the hyphen may be omitted. If no algorithm is specified,
the default is to use both SHA-1 and SHA-256.
- -A
Include ZSKs when generating DS records. Without this option, only
keys which have the KSK flag set will be converted to DS records
and printed. Useful only in -f zone file mode.
- -c
class
Specifies the DNS class (default is IN). Useful only
in -s keyset or -f
zone file mode.
- -C
Generate CDS records rather than DS records. This is mutually
exclusive with the -l option for generating DLV
records.
- -f
file
-
Zone file mode: dnssec-dsfromkey's
final dnsname argument is
the DNS domain name of a zone whose master file can be read
from file. If the zone name is the same as
file, then it may be omitted.
If file is "-", then
the zone data is read from the standard input. This makes it
possible to use the output of the dig
command as input, as in:
dig dnskey example.com | dnssec-dsfromkey -f - example.com
- -h
Prints usage information.
- -K
directory
Look for key files or keyset- files in
directory.
- -l
domain
Generate a DLV set instead of a DS set. The specified
domain is appended to the name for each
record in the set.
This is mutually exclusive with the -C option
for generating CDS records.
- -s
Keyset mode: dnssec-dsfromkey's
final dnsname argument is the DNS
domain name used to locate a keyset- file.
- -T
TTL
Specifies the TTL of the DS records. By default the TTL is omitted.
- -v
level
Sets the debugging level.
- -V
Prints version information.
EXAMPLE
To build the SHA-256 DS RR from the
Kexample.com.+003+26160
keyfile name, you can issue the following command:
dnssec-dsfromkey -2 Kexample.com.+003+26160
The command would print something like:
example.com. IN DS 26160 5 2 3A1EADA7A74B8D0BA86726B0C227AA85AB8BBD2B2004F41A868A54F0C5EA0B94
FILES
The keyfile can be designated by the key identification
Knnnn.+aaa+iiiii or the full file name
Knnnn.+aaa+iiiii.key as generated by
dnssec-keygen(8).
The keyset file name is built from the directory,
the string keyset- and the
dnsname.
CAVEAT
A keyfile error can give a "file not found" even if the file exists.
SEE ALSO
dnssec-keygen(8),
dnssec-signzone(8),
BIND 9 Administrator Reference Manual,
RFC 3658 (DS RRs),
RFC 4431 (DLV RRs),
RFC 4509 (SHA-256 for DS RRs),
RFC 6605 (SHA-384 for DS RRs),
RFC 7344 (CDS and CDNSKEY RRs).