205 lines
4.8 KiB
Perl
205 lines
4.8 KiB
Perl
package Net::DNS::RR::SSHFP;
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use strict;
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use warnings;
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our $VERSION = (qw$Id: SSHFP.pm 1896 2023-01-30 12:59:25Z willem $)[2];
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use base qw(Net::DNS::RR);
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=head1 NAME
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Net::DNS::RR::SSHFP - DNS SSHFP resource record
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=cut
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use integer;
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use Carp;
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use constant BABBLE => defined eval { require Digest::BubbleBabble };
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sub _decode_rdata { ## decode rdata from wire-format octet string
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my ( $self, $data, $offset ) = @_;
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my $size = $self->{rdlength} - 2;
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@{$self}{qw(algorithm fptype fpbin)} = unpack "\@$offset C2 a$size", $$data;
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return;
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}
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sub _encode_rdata { ## encode rdata as wire-format octet string
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my $self = shift;
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return pack 'C2 a*', @{$self}{qw(algorithm fptype fpbin)};
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}
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sub _format_rdata { ## format rdata portion of RR string.
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my $self = shift;
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$self->_annotation( $self->babble ) if BABBLE;
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my @fprint = split /(\S{64})/, $self->fp;
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my @rdata = ( $self->algorithm, $self->fptype, @fprint );
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return @rdata;
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}
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sub _parse_rdata { ## populate RR from rdata in argument list
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my ( $self, @argument ) = @_;
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for (qw(algorithm fptype)) { $self->$_( shift @argument ) }
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$self->fp(@argument);
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return;
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}
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sub algorithm {
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my ( $self, @value ) = @_;
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for (@value) { $self->{algorithm} = 0 + $_ }
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return $self->{algorithm} || 0;
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}
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sub fptype {
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my ( $self, @value ) = @_;
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for (@value) { $self->{fptype} = 0 + $_ }
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return $self->{fptype} || 0;
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}
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sub fp {
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my ( $self, @value ) = @_;
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return unpack "H*", $self->fpbin() unless scalar @value;
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my @hex = map { /^"*([\dA-Fa-f]*)"*$/ || croak("corrupt hex"); $1 } @value;
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return $self->fpbin( pack "H*", join "", @hex );
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}
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sub fpbin {
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my ( $self, @value ) = @_;
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for (@value) { $self->{fpbin} = $_ }
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return $self->{fpbin} || "";
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}
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sub babble {
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return BABBLE ? Digest::BubbleBabble::bubblebabble( Digest => shift->fpbin ) : '';
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}
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sub fingerprint { return &fp; } ## historical
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1;
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__END__
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=head1 SYNOPSIS
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use Net::DNS;
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$rr = Net::DNS::RR->new('name SSHFP algorithm fptype fp');
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=head1 DESCRIPTION
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DNS SSH Fingerprint (SSHFP) resource records.
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=head1 METHODS
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The available methods are those inherited from the base class augmented
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by the type-specific methods defined in this package.
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Use of undocumented package features or direct access to internal data
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structures is discouraged and could result in program termination or
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other unpredictable behaviour.
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=head2 algorithm
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$algorithm = $rr->algorithm;
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$rr->algorithm( $algorithm );
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The 8-bit algorithm number describes the algorithm used to
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construct the public key.
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=head2 fptype
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$fptype = $rr->fptype;
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$rr->fptype( $fptype );
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The 8-bit fingerprint type number describes the message-digest
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algorithm used to calculate the fingerprint of the public key.
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=head2 fingerprint
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=head2 fp
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$fp = $rr->fp;
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$rr->fp( $fp );
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Hexadecimal representation of the fingerprint digest.
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=head2 fpbin
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$fpbin = $rr->fpbin;
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$rr->fpbin( $fpbin );
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Returns opaque octet string representing the fingerprint digest.
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=head2 babble
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print $rr->babble;
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The babble() method returns the 'BabbleBubble' representation of
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the fingerprint if the Digest::BubbleBabble package is available,
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otherwise an empty string is returned.
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Bubble babble represents a message digest as a string of "real"
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words, to make the fingerprint easier to remember. The "words"
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are not necessarily real words, but they look more like words
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than a string of hex characters.
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Bubble babble fingerprinting is used by the SSH2 suite (and
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consequently by Net::SSH::Perl, the Perl SSH implementation)
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to display easy-to-remember key fingerprints.
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The 'BubbleBabble' string is appended as a comment when the
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string method is called.
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=head1 COPYRIGHT
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Copyright (c)2007 Olaf Kolkman, NLnet Labs.
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All rights reserved.
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Package template (c)2009,2012 O.M.Kolkman and R.W.Franks.
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=head1 LICENSE
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted, provided
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that the original copyright notices appear in all copies and that both
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copyright notice and this permission notice appear in supporting
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documentation, and that the name of the author not be used in advertising
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or publicity pertaining to distribution of the software without specific
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prior written permission.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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=head1 SEE ALSO
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L<perl> L<Net::DNS> L<Net::DNS::RR>
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L<RFC4255|https://tools.ietf.org/html/rfc4255>
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=cut
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