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#!/usr/bin/env perl
#
# Copyright (c) 2021 Omar Polo <op@omarpolo.com>
#
# Permission to use, copy, modify, and 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 THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
#
# You can read the documentation for this script using
#
# $ perldoc renew-certs
#
use v5.10;
use strict;
use warnings;
use Getopt::Std;
use Time::Piece;
my $auto = 0;
my $conf = '/etc/gmid.conf';
my $days = 365;
my $gmid = 'gmid';
my $restart = 0;
my $threshold = 24 * 60 * 60;
my %options = ();
getopts("ac:d:g:r", \%options);
foreach my $flag (keys %options) {
if ($flag eq 'a') {
$auto = 1;
} elsif ($flag eq 'c') {
$conf = $options{c};
} elsif ($flag eq 'd') {
$days = int($options{d}) or exit 1;
} elsif ($flag eq 'g') {
$gmid = $options{g};
} elsif ($flag eq 'r') {
$auto = 1;
$restart = 1;
} elsif ($flag eq 't') {
$threshold = int($options{t}) or exit 1;
}
}
my $now = localtime()->epoch + $threshold;
my $found_one = 0;
my $c = `$gmid -nn -c $conf @ARGV 2>/dev/null`;
die "$gmid failed to parse $conf" if $? != 0;
while ($c =~ /server \"(.*)\"/g) {
my $server = $1;
$c =~ /cert \"(.*)\"/gc;
my $cert = $1;
$c =~ /key \"(.*)\"/gc;
my $key = $1;
if (expired($cert)) {
$found_one = 1;
if ($auto) {
renew($server, $cert, $key);
} else {
say $server;
}
}
}
if ($found_one && $restart) {
my @cmd = ("pkill", "-HUP", $gmid);
system(@cmd);
}
exit !$found_one;
sub expired {
my ($cert) = @_;
my $exp = `openssl x509 -noout -enddate -in $cert`;
die 'failed to execute openssl' if $? != 0;
chomp $exp;
my $d = Time::Piece->strptime($exp, "notAfter=%b %e %T %Y %Z");
return $d->epoch < $now;
}
sub renew {
my ($hostname, $cert, $key) = @_;
my @cmd = (
"openssl", "req", "-x509",
"-newkey", "rsa:4096",
"-out", $cert,
"-keyout", $key,
"-days", $days,
"-nodes",
"-subj", "/CN=".$hostname,
);
system(@cmd) == 0
or die "system @cmd failed: $?";
}
__END__
=head1 NAME
B<renew-certs> - automatically renew gmid certificates
=head1 SYNOPSIS
B<renew-certs> [-ar] [-c I<conf>] [-d I<days>] [-g I<gmid>] [-t I<threshold>] [-- I<gmid flags...>]
=head1 DESCRIPTION
B<renew-certs> attempts to renew the certificates used by gmid if they
are close to the expiration date and can optionally restart the
server. It's meant to be used in a crontab(5) file.
B<renew-certs> needs at least B<gmid> 1.8.
The arguments are as follows:
=over
=item -a
Automatically generate a new set of certificates.
=item -c I<conf>
Path to the gmid configuration. By default is F</etc/gmid.conf>.
=item -d I<days>
Number of I<days> the newly generated certificates will be valid for;
365 by default.
=item -g I<gmid>
Path to the gmid(1) executable.
=item -r
Restart B<gmid> after re-generating the certificates by killing it
with SIGHUP. Implies -a.
=item -t I<threshold>
Tweak the expiring I<threshold>. Certificates whose I<notAfter> field
ends before I<threshold> seconds will be considered outdated. By
default is 86400, or 24 * 60 * 60, 24 hours.
=item I<gmid flags>
Additional flags to be passed to gmid(1).
=back
=head1 EXIT STATUS
The B<renew-certs> utility exits on 0 when at least one certificate is
about to expire and >0 otherwise, or if an error occurs.
=head1 EXAMPLES
Some examples of how to use B<renew-certs> in a crontab(5) file
follows:
# automatically renew and restart gmid
0 0 * * * renew-certs -r
# like the previous, but pass a custom flag to gmid
0 0 * * * renew-certs -r -- -Dcerts=/etc/ssl/
# automatically renew the certs but use a custom
# command (rcctl in this case) to restart the server
0 0 * * * renew-certs -a && rcctl restart gmid
# only check for expiration. `cmd' can read the names of the
# servers with an expiring certificate from stdin, one per
# line
0 0 * * * renew-certs | cmd
=head1 SEE ALSO
crontab(1) gmid(1) openssl(1) crontab(5)
=cut
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