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#!/usr/local/bin/perl
use strict;
use warnings;
use Net::LDAP;
use Net::LDAP::Util qw(escape_filter_value);
use Authen::SASL;
sub quit {
# Prints an error message and exits with code 0.
# NB: If KnownHostsCommand returns nonzero, the entire SSH connection aborts,
# which isn't what we want.
print STDERR "$0: $_[0]" if @_ > 0;
exit 0
}
@ARGV == 1 or die "usage: $0 HOSTNAME\n";
my $hostname = $ARGV[0];
open my $fh, '<', '/usr/local/etc/openldap/ldap.conf' or quit($!);
my %config;
while (<$fh>) {
chomp;
next if /^#/;
my @pair = split(' ', $_, 2);
next unless (@pair == 2);
$config{$pair[0]} = $pair[1];
}
close($fh);
my $mech = $config{SASL_MECH} // 'GSSAPI';
my $uri = $config{URI} // quit('URI not specified');
my $basedn = $config{HOSTS_BASE} // quit('HOSTS_BASE not specified');
my $conn = Net::LDAP->new($uri, version => '3') or quit($@);
my $sasl = Authen::SASL->new($mech);
my $status = $conn->bind(sasl => $sasl);
$status->code and quit($status->error);
my $search = $conn->search(
scope => 'sub',
base => $basedn,
filter => '(&(sshPublicKey=*)(associatedDomain=' . escape_filter_value($hostname) . '))',
attrs => ['sshPublicKey']);
$search->code and quit($search->error);
quit if $search->entries == 0;
quit("multiple LDAP entries returned for host: $hostname\n") if $search->entries > 1;
print "$hostname $_\n" foreach (($search->entries)[0]->get_value('sshPublicKey'));
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