314 lines
8.3 KiB
Perl
Executable file
314 lines
8.3 KiB
Perl
Executable file
#!/usr/bin/perl
|
|
|
|
# $Id: check_zone_rrsig_expiration,v 1.14 2015/10/12 16:54:20 wessels Exp $
|
|
#
|
|
# check_zone_rrsig_expiration
|
|
#
|
|
# nagios plugin to check expiration times of RRSIG records. Reminds
|
|
# you if its time to re-sign your zone.
|
|
|
|
# Copyright (c) 2008, The Measurement Factory, Inc. All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions
|
|
# are met:
|
|
#
|
|
# Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer.
|
|
# Redistributions in binary form must reproduce the above copyright
|
|
# notice, this list of conditions and the following disclaimer in the
|
|
# documentation and/or other materials provided with the distribution.
|
|
# Neither the name of The Measurement Factory nor the names of its
|
|
# contributors may be used to endorse or promote products derived
|
|
# from this software without specific prior written permission.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
# POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
# usage
|
|
#
|
|
# define command {
|
|
# command_name check-zone-rrsig
|
|
# command_line /usr/local/libexec/nagios-local/check_zone_rrsig -Z $HOSTADDRESS$
|
|
# }
|
|
#
|
|
# define service {
|
|
# name dns-rrsig-service
|
|
# check_command check-zone-rrsig
|
|
# ...
|
|
# }
|
|
#
|
|
# define host {
|
|
# use dns-zone
|
|
# host_name zone.example.com
|
|
# alias ZONE example.com
|
|
# }
|
|
#
|
|
# define service {
|
|
# use dns-rrsig-service
|
|
# host_name zone.example.com
|
|
# }
|
|
|
|
use warnings;
|
|
use strict;
|
|
|
|
use Getopt::Std;
|
|
use Net::DNS::Resolver;
|
|
use Time::HiRes qw ( gettimeofday tv_interval);
|
|
use Time::Local;
|
|
use List::Util qw ( shuffle );
|
|
|
|
# options
|
|
# -Z zone Zone to test
|
|
# -t seconds DNS query timeout
|
|
# -d debug
|
|
# -C days Critical if expiring in this many days
|
|
# -W days Warning if expiring in this many days
|
|
# -T type Query type (default SOA)
|
|
# -4 use IPv4 only
|
|
# -U size EDNS0 UDP packet size (default 4096)
|
|
my %opts = (t=>30, C=>2, W=>3, T=>'SOA', U=>4096);
|
|
getopts('4Z:dt:W:C:T:U:', \%opts);
|
|
usage() unless $opts{Z};
|
|
usage() if $opts{h};
|
|
my $zone = $opts{Z};
|
|
$zone =~ s/^zone\.//;
|
|
|
|
my $data;
|
|
my $start;
|
|
my $stop;
|
|
|
|
my @refs = qw (
|
|
a.root-servers.net
|
|
b.root-servers.net
|
|
c.root-servers.net
|
|
d.root-servers.net
|
|
e.root-servers.net
|
|
f.root-servers.net
|
|
g.root-servers.net
|
|
h.root-servers.net
|
|
i.root-servers.net
|
|
j.root-servers.net
|
|
k.root-servers.net
|
|
l.root-servers.net
|
|
m.root-servers.net
|
|
);
|
|
|
|
$start = [gettimeofday()];
|
|
do_recursion();
|
|
do_queries();
|
|
$stop = [gettimeofday()];
|
|
do_analyze();
|
|
|
|
sub do_recursion {
|
|
my $done = 0;
|
|
my $res = Net::DNS::Resolver->new;
|
|
do {
|
|
print STDERR "\nRECURSE\n" if $opts{d};
|
|
my $pkt;
|
|
foreach my $ns (shuffle @refs) {
|
|
print STDERR "sending query for $zone $opts{T} to $ns\n" if $opts{d};
|
|
$res->nameserver($ns);
|
|
$res->udp_timeout($opts{t});
|
|
$res->recurse(0);
|
|
$res->dnssec(1);
|
|
$res->udppacketsize($opts{U});
|
|
$res->force_v4(1) if $opts{'4'};
|
|
$pkt = $res->send($zone, $opts{T});
|
|
last if $pkt;
|
|
}
|
|
critical("No response to seed query") unless $pkt;
|
|
critical($pkt->header->rcode . " from " . $pkt->answerfrom)
|
|
unless ($pkt->header->rcode eq 'NOERROR');
|
|
@refs = ();
|
|
foreach my $rr ($pkt->authority) {
|
|
next unless $rr->type eq 'NS';
|
|
print STDERR $rr->string, "\n" if $opts{d};
|
|
push (@refs, $rr->nsdname);
|
|
next unless names_equal($rr->name, $zone);
|
|
add_nslist_to_data($pkt);
|
|
$done = 1;
|
|
}
|
|
} while (! $done);
|
|
}
|
|
|
|
|
|
sub do_queries {
|
|
my $n;
|
|
do {
|
|
$n = 0;
|
|
foreach my $ns (keys %$data) {
|
|
next if $data->{$ns}->{done};
|
|
print STDERR "\nQUERY $ns\n" if $opts{d};
|
|
|
|
my $pkt = send_query($zone, $opts{T}, $ns);
|
|
add_nslist_to_data($pkt);
|
|
$data->{$ns}->{queries}->{$opts{T}} = $pkt;
|
|
|
|
print STDERR "done with $ns\n" if $opts{d};
|
|
$data->{$ns}->{done} = 1;
|
|
$n++;
|
|
}
|
|
} while ($n);
|
|
}
|
|
|
|
sub do_analyze {
|
|
my $nscount = 0;
|
|
my $NOW = time;
|
|
my %MAX_EXP_BY_TYPE;
|
|
foreach my $ns (keys %$data) {
|
|
print STDERR "\nANALYZE $ns\n" if $opts{d};
|
|
my $pkt = $data->{$ns}->{queries}->{$opts{T}};
|
|
critical("No response from $ns") unless $pkt;
|
|
print STDERR $pkt->string if $opts{d};
|
|
critical($pkt->header->rcode . " from $ns")
|
|
unless ($pkt->header->rcode eq 'NOERROR');
|
|
critical("$ns is lame") unless $pkt->header->ancount;
|
|
foreach my $rr ($pkt->answer) {
|
|
next unless $rr->type eq 'RRSIG';
|
|
my $exp = sigrr_exp_epoch($rr);
|
|
my $T = $rr->typecovered;
|
|
if (!defined($MAX_EXP_BY_TYPE{$T}->{exp}) || $exp > $MAX_EXP_BY_TYPE{$T}->{exp}) {
|
|
$MAX_EXP_BY_TYPE{$T}->{exp} = $exp;
|
|
$MAX_EXP_BY_TYPE{$T}->{ns} = $ns;
|
|
}
|
|
}
|
|
$nscount++;
|
|
}
|
|
warning("No nameservers found. Is '$zone' a zone?") if ($nscount < 1);
|
|
warning("No RRSIGs found") unless %MAX_EXP_BY_TYPE;
|
|
my $min_exp = undef;
|
|
my $min_ns = undef;
|
|
my $min_type = undef;
|
|
foreach my $T (keys %MAX_EXP_BY_TYPE) {
|
|
printf STDERR ("%s RRSIG expires in %.1f days\n", $T, ($MAX_EXP_BY_TYPE{$T}->{exp}-$NOW)/86400) if $opts{d};
|
|
if (!defined($min_exp) || $MAX_EXP_BY_TYPE{$T}->{exp} < $min_exp) {
|
|
$min_exp = $MAX_EXP_BY_TYPE{$T}->{exp};
|
|
$min_ns = $MAX_EXP_BY_TYPE{$T}->{ns};
|
|
$min_type = $T;
|
|
}
|
|
}
|
|
critical("$min_ns has expired RRSIGs") if ($min_exp < $NOW);
|
|
if ($min_exp - $NOW < ($opts{C}*86400)) {
|
|
my $ND = sprintf "%3.1f days", ($min_exp-$NOW)/86400;
|
|
critical("$min_type RRSIG expires in $ND at $min_ns")
|
|
}
|
|
if ($min_exp - $NOW < ($opts{W}*86400)) {
|
|
my $ND = sprintf "%3.1f days", ($min_exp-$NOW)/86400;
|
|
warning("$min_type RRSIG expires in $ND at $min_ns")
|
|
}
|
|
success("No RRSIGs expiring in the next $opts{W} days");
|
|
}
|
|
|
|
sub sigrr_exp_epoch {
|
|
my $rr = shift;
|
|
die unless $rr->type eq 'RRSIG';
|
|
my $exp = $rr->sigexpiration;
|
|
die "bad exp time '$exp'"
|
|
unless $exp =~ /^(\d\d\d\d)(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/;
|
|
my $exp_epoch = timegm($6,$5,$4,$3,$2-1,$1);
|
|
return $exp_epoch;
|
|
}
|
|
|
|
sub add_nslist_to_data {
|
|
my $pkt = shift;
|
|
foreach my $ns (get_nslist($pkt)) {
|
|
next if defined $data->{$ns}->{done};
|
|
print STDERR "adding NS $ns\n" if $opts{d};
|
|
$data->{$ns}->{done} |= 0;
|
|
}
|
|
}
|
|
|
|
sub success {
|
|
output('OK', shift);
|
|
exit(0);
|
|
}
|
|
|
|
sub warning {
|
|
output('WARNING', shift);
|
|
exit(1);
|
|
}
|
|
|
|
sub critical {
|
|
output('CRITICAL', shift);
|
|
exit(2);
|
|
}
|
|
|
|
sub output {
|
|
my $state = shift;
|
|
my $msg = shift;
|
|
$stop = [gettimeofday()] unless $stop;
|
|
my $latency = tv_interval($start, $stop);
|
|
printf "ZONE %s: %s; (%.2fs) |time=%.6fs;;;0.000000\n",
|
|
$state,
|
|
$msg,
|
|
$latency,
|
|
$latency;
|
|
}
|
|
|
|
sub usage {
|
|
print STDERR "usage: $0 -Z zone -d -t timeout -W days -C days\n";
|
|
print STDERR "\t-Z zone zone to test\n";
|
|
print STDERR "\t-T type query type (default SOA)\n";
|
|
print STDERR "\t-d debug\n";
|
|
print STDERR "\t-t seconds timeout on DNS queries\n";
|
|
print STDERR "\t-W days warning threshhold\n";
|
|
print STDERR "\t-C days critical threshold\n";
|
|
print STDERR "\t-4 use IPv4 only\n";
|
|
print STDERR "\t-U bytes EDNS0 UDP buffer size (default 4096)\n";
|
|
exit 3;
|
|
}
|
|
|
|
sub send_query {
|
|
my $qname = shift;
|
|
my $qtype = shift;
|
|
my $server = shift;
|
|
my $res = Net::DNS::Resolver->new;
|
|
$res->nameserver($server) if $server;
|
|
$res->udp_timeout($opts{t});
|
|
$res->retry(2);
|
|
$res->recurse(0);
|
|
$res->dnssec(1);
|
|
$res->udppacketsize($opts{U});
|
|
$res->force_v4(1) if $opts{'4'};
|
|
my $pkt = $res->send($qname, $qtype);
|
|
unless ($pkt) {
|
|
$res->usevc(1);
|
|
$res->tcp_timeout($opts{t});
|
|
$pkt = $res->send($qname, $qtype);
|
|
}
|
|
return $pkt;
|
|
}
|
|
|
|
sub get_nslist {
|
|
my $pkt = shift;
|
|
return () unless $pkt;
|
|
return () unless $pkt->authority;
|
|
my @nslist;
|
|
foreach my $rr ($pkt->authority) {
|
|
next unless ($rr->type eq 'NS');
|
|
next unless names_equal($rr->name, $zone);
|
|
push(@nslist, lc($rr->nsdname));
|
|
}
|
|
return @nslist;
|
|
}
|
|
|
|
sub names_equal {
|
|
my $a = shift;
|
|
my $b = shift;
|
|
$a =~ s/\.$//;
|
|
$b =~ s/\.$//;
|
|
lc($a) eq lc($b);
|
|
}
|
|
|