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Add "certbot-certs"

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This plugin will semi-auto discover certbot (letsencrypt) certificates and output their expiry in days.
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JTSage 2020-11-27 12:36:16 -05:00 • committed by Lars Kruse
parent fa059d2a23
commit 2f7d94071d
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plugins/ssl/certbot_certs Executable file
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#!/usr/bin/perl
# -*- perl -*-
=encoding utf8
=head1 NAME
certbot_certs - Munin plugin to certbot (letsencrypt) certificate expiry
=head1 APPLICABLE SYSTEMS
Servers running certbot certificates. This script auto-discovers the current set of certificates
=head1 CONFIGURATION
This script requires root permissions to run, in your munin-node configuration:
[certbot_certs]
user root
=head1 CAPABILITIES
This plugin supports L<DIRTYCONFIG|http://guide.munin-monitoring.org/en/latest/plugin/protocol-dirtyconfig.html>
=head1 LICENSE
Copyright (C) 2018 J.T.Sage (jtsage@gmail.com)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see L<http://www.gnu.org/licenses/>.
=head1 MAGIC MARKERS
#%# family=manual
#%# capabilities=
=cut
use warnings;
use strict;
use Munin::Plugin;
use Date::Parse;
use POSIX;
if ( defined($ARGV[0]) && $ARGV[0] eq "autoconf" ) {
if ( -e "/usr/bin/openssl" ) {
print "no (Root User Required)\n";
} else {
print "no (OpenSSL Not Found)\n";
}
exit;
}
my %thecerts = get_data();
if ( defined($ARGV[0]) && $ARGV[0] eq "config" ) {
# Do the config step for each set of graphs
do_config(%thecerts);
# If dirtyconfig is not supported, or turned off, exit here. Otherwise, continue to fetch section
if ( !defined($ENV{'MUNIN_CAP_DIRTYCONFIG'}) || !$ENV{'MUNIN_CAP_DIRTYCONFIG'} ) { exit 0; }
}
# Do the fetch step for each set of graphs
do_values(%thecerts);
sub do_config {
print "graph_title LetsEncrypt Certificate Expiry\n";
print "graph_args --upper-limit 90 -l 0\n";
print "graph_vlabel days\n";
print "graph_category security\n";
print "graph_info This graph shows the number of days until certificate expiry\n";
my ( %certs ) = @_;
foreach my $key ( keys %certs ) {
print $certs{$key}{"safename"} . ".label " . $certs{$key}{"name"} . "\n";
print $certs{$key}{"safename"} . ".info " . $certs{$key}{"info"} . "\n";
print $certs{$key}{"safename"} . ".warning 29:\n";
print $certs{$key}{"safename"} . ".critical 15:\n";
}
}
sub do_values {
my ( %certs ) = @_;
foreach my $key ( keys %certs ) {
print $certs{$key}{"safename"} . ".value " . $certs{$key}{"expdays"} . "\n";
}
}
sub get_data {
my $runtime = time();
my %cert_files;
# Get Renewal Files
opendir(DIR, "/etc/letsencrypt/renewal");
my @renew_files = grep(/\.conf$/,readdir(DIR));
closedir(DIR);
# Each renewal file
foreach my $file (@renew_files) {
my @this_renew = `cat /etc/letsencrypt/renewal/$file`;
my $cert_name = $file;
$cert_name =~ s/\.conf//;
my $safe_name = $cert_name;
$safe_name =~ s/\./_/g;
$cert_files{$cert_name}{"name"} = $cert_name;
$cert_files{$cert_name}{"safename"} = $safe_name;
# cert is listed
foreach my $line ( @this_renew ) {
if ( $line =~ /cert = (.+?)$/ ) {
$cert_files{$cert_name}{"cert"} = $1;
}
}
# use openssl for the info
my @ssl_info = `openssl x509 -noout -in $cert_files{$cert_name}{"cert"} -text -certopt no_subject,no_header,no_version,no_serial,no_signame,no_validity,no_issuer,no_pubkey,no_sigdump,no_aux -enddate`;
# parse for SAN and expiry
foreach my $line ( @ssl_info ) {
if ( $line =~ /notAfter=(.+?)$/ ) {
$cert_files{$cert_name}{"expdate"} = $1;
$cert_files{$cert_name}{"expdays"} = floor((str2time($1) - $runtime)/(60*60*24));
}
if ( $line =~ /(DNS:.+?)$/ ) {
my $san_line = $1;
$san_line =~ s/DNS://g;
$cert_files{$cert_name}{"info"} = $san_line;
}
}
}
return %cert_files;
}