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#!/usr/bin/perl
#
# Use try to connect to a SMTP server over SSL, and
# wait for the right output. Can also warn about cert expiration.
#
# For use with "mon".
#
# Arguments are "-p port -t timeout host [host...]"
#
# Adapted from "smtp.monitor" by
# David Nolan, vitroth+mon@cmu.edu
#
# Which was adapted from "http.monitor" by
# Jim Trocki, trockij@transmeta.com
#
# http.monitor written by
#
# Jon Meek
# American Cyanamid Company
# Princeton, NJ
#
# $Id: smtp-ssl.monitor,v 1.1 2005/08/20 17:54:09 vitroth Exp $
#
# Copyright (C) 1998, Jim Trocki
#
# 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 2 of the License, or
# (at your option) 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
use Getopt::Std;
use Net::SSLeay::Handle qw/shutdown/;
use English;
use Time::ParseDate;
getopts ("p:t:T:w:");
$PORT = $opt_p || 465;
$TIMEOUT = $opt_t || 30;
$THRESHOLD = $opt_T || 0;
$EXPIREWARN = $opt_w ; # How long in advance to warn about cert expiration. 0 means don't warn
$EXPIREWARN = 0 if (!defined $EXPIREWARN); # Don't warn by default
@failures = ();
foreach $host (@ARGV) {
if (! &smtpGET($host, $PORT)) {
push (@failures, $host);
}
}
if (@failures == 0) {
exit 0;
}
print join (" ", sort @failures), "\n";
foreach $msg (@details)
{
print "$msg\n";
}
if (@failures <= $THRESHOLD) {
exit @failures;
}
exit 255;
sub smtpGET {
use Socket;
use Sys::Hostname;
my($Server, $Port) = @_;
my($ServerOK, $TheContent);
my ($OurHostname);
$ServerOK = 0;
$TheContent = '';
$Path = '/';
###############################################################
eval {
local $SIG{ALRM} = sub { die "Timeout Alarm" };
alarm $TIMEOUT;
tie(*S2, "Net::SSLeay::Handle", $Server, $Port);
$in = <S2>;
$in = <S2> while $in =~ /^220-/;
if ($in !~ /^220 /) {
alarm 0;
push(@details, "${Server}: $in");
return 0;
}
$OurHostname = &hostname;
print S2 "HELO $OurHostname\r\n";
$in = <S2>;
$in = <S2> while $in =~ /^250-/;
if ($in !~ /^250 /) {
alarm 0;
push(@details, "${Server}: $in");
return 0;
}
print S2 "quit\r\n";
$in = <S2>;
if ($in !~ /^221 /) {
alarm 0;
push(@details, "${Server}: $in");
return 0;
}
$ServerOK = 1;
alarm 0; # Cancel the alarm
if ($EXPIREWARN) {
my $ssl = Net::SSLeay::Handle::_get_ssl(\*S2);
my $cert = Net::SSLeay::get_peer_certificate($ssl);
my $servercertname = Net::SSLeay::X509_NAME_oneline(Net::SSLeay::X509_get_subject_name($cert));
my $signingcertname = Net::SSLeay::X509_NAME_oneline(Net::SSLeay::X509_get_issuer_name($cert));
my $notafter = Net::SSLeay::P_ASN1_UTCTIME_put2string (Net::SSLeay::X509_get_notAfter($cert));
my $notbefore = Net::SSLeay::P_ASN1_UTCTIME_put2string (Net::SSLeay::X509_get_notBefore($cert));
my $na_time = parsedate($notafter);
my $nb_time = parsedate($notbefore);
my $now = time;
my $later = $now + (86400 * $EXPIREWARN);
print STDERR "XXXXX\nnotbefore $notbefore\nnotafter $notafter\nna_time $na_time\nnb_time $nb_time\nnow $now\nlater $later\n" if $opt_v;
if ( $now < $nb_time ) {
push @details,"$Server: Certificate not valid until $notbefore\ncertificate: $servercertname\nCA certificate: $signingcertname";
$ServerOK = 0;
}
if ($now > $na_time) {
push @details,"$Server: Certificate expired as of $notafter\ncertificate: $servercertname\nCA certificate: $signingcertname";
$ServerOK = 0;
} elsif ($later > $na_time ) {
push @details,"$Server: Certificate will expire at $notafter\ncertificate: $servercertname\nCA certificate: $signingcertname";
$ServerOK = 0;
}
}
shutdown(\*S2, 1);
close(S2);
};
if ($EVAL_ERROR) {
if ($EVAL_ERROR =~ /^Timeout Alarm/) {
push(@details, "${Server}: Connection timed out");
return 0;
} else {
push(@details, "${Server}: $EVAL_ERROR");
return 0;
}
}
return $ServerOK;
}
sub OpenSocket {
#
# Make a Berkeley socket connection between this program and a TCP port
# on another (or this) host. Port can be a number or a named service
#
local($OtherHostname, $Port) = @_;
local($OurHostname, $sockaddr, $name, $aliases, $proto, $type, $len,
$ThisAddr, $that);
$OurHostname = &hostname;
($name, $aliases, $proto) = getprotobyname('tcp');
($name, $aliases, $Port) = getservbyname($Port, 'tcp') unless $Port =~ /^\d+$/;
($name, $aliases, $type, $len, $ThisAddr) = gethostbyname($OurHostname);
($name, $aliases, $type, $len, $OtherHostAddr) = gethostbyname($OtherHostname);
my $that = sockaddr_in ($Port, $OtherHostAddr);
$result = socket(S, &PF_INET, &SOCK_STREAM, $proto) || return undef;
$result = connect(S, $that) || return undef;
select(S); $| = 1; select(STDOUT); # set S to be un-buffered
return 1; # success
}
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