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2992. [contrib] contrib/check-secure-delegation.pl: A simple tool

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for looking at a secure delegation. [RT #22059]
This commit is contained in:
Mark Andrews
2010-12-21 02:32:21 +00:00
parent 1f512cd06b
commit 0ece47f7c1
4 changed files with 128 additions and 1 deletions
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contrib/check-secure-delegation.pl.in Normal file
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#!@PERL@
#
# Copyright (C) 2010 Internet Systems Consortium, Inc. ("ISC")
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.
# $Id: check-secure-delegation.pl.in,v 1.2 2010/12/21 02:32:21 marka Exp $
use warnings;
use FileHandle;
use IPC::Open2;
use POSIX qw/strftime/;
#
# We only compare keyid / DNSSEC algorithm pairs. If this succeeds then
# the crypto will likely succeed. If it fails then the crypto will definitely
# fail.
#
$prefix = "@prefix@";
$dig = "$prefix/bin/dig +cd +dnssec +noall +answer";
$dsfromkey = "$prefix/sbin/dnssec-dsfromkey -1 -A -f /dev/stdin";
# Get "now" in a RRSIG datestamp format.
$now = strftime "%Y%m%d%H%M%S", gmtime;
foreach $zone (@ARGV) {
my %algorithms = ();
my %dnskeygood = ();
my %dnskeyalg = ();
my %dnskey = ();
my %dsgood = ();
my %ds = ();
# Read the DS records and extract the key id, algorithm pairs
open(DS, "$dig -t DS -q $zone|") || die("dig DS failed");
while(<DS>) {
@words = split;
if ($words[3] eq "RRSIG" && $words[4] eq "DS") {
next if ($words[8] >= $now && $words[9] <= $now);
print "BAD SIG DATES: $_";
}
next if ($words[3] ne "DS");
$ds{"$words[4] $words[5]"} = 1;
$algorithms{"$words[5]"} = 1;
}
close(DS);
# Read the RRSIG(DNSKEY) records and extract the key id,
# algorithm pairs. Set good if we have a match against the DS
# records. DNSKEY records should be before the RRSIG records.
open(DNSKEY, "$dig -t DNSKEY -q $zone|") || die("dig DNSKEY failed");
while (<DNSKEY>) {
@words = split;
if ($words[3] eq "DNSKEY") {
$dnskeyalg{"$words[6]"} = 1;
next if (! -e "/dev/stdin");
# get the key id ($dswords[3]).
$pid = open2(*Reader, *Writer, "$dsfromkey $zone");
die("dsfromkey failed") if ($pid == -1);
print Writer "$_";
close(Writer);
$line = <Reader>;
close(Reader);
@dswords = split /\s/, $line;
$dnskey{"$dswords[3] $dswords[4]"} = 1;
next;
}
next if ($words[3] ne "RRSIG" || $words[4] ne "DNSKEY");
if ($words[8] >= $now && $words[9] <= $now) {
# If we don't have /dev/stdin then just check for the
# RRSIG otherwise check for both the DNSKEY and
# RRSIG.
$dsgood{"$words[5]"} = 1
if (! -e "/dev/stdin" &&
exists($ds{"$words[10] $words[5]"}));
$dsgood{"$words[5]"} = 1
if (exists($ds{"$words[10] $words[5]"}) &&
exists($dnskey{"$words[10] $words[5]"}));
$dnskeygood{"$words[5]"} = 1
if (! -e "/dev/stdin");
$dnskeygood{"$words[5]"} = 1
if (exists($dnskey{"$words[10] $words[5]"}));
} else {
$dnskeygood{"$words[5]"} = 1;
print "BAD SIG DATES: $_";
}
}
close(DNSKEY);
# Do we have signatures for all DNSKEY algorithms?
foreach $alg ( keys %dnskeyalg ) {
print "Missing $zone DNSKEY RRSIG for algorithm $alg\n"
if (!exists($dnskeygood{$alg}));
}
# Do we have a matching self signed DNSKEY for all DNSSEC algorithms
# in the DS records.
$count = 0;
foreach $alg ( keys %algorithms ) {
if (exists($dsgood{$alg})) {
print "$zone algorithm $alg good " .
"(found DS / self signed DNSKEY pair)\n";
} else {
print "$zone algorithm $alg bad " .
"(no DS / self signed DNSKEY pair found)\n";
}
$count++;
}
print "$zone has no secure delegation records\n"
if (! $count);
}