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script/shell/ssl/ssl-cert-check.sh

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#!/usr/bin/env bash
PROGRAMVERSION=4.14
#
# Program: SSL Certificate Check <ssl-cert-check>
#
# Source code home: https://github.com/Matty9191/ssl-cert-check
#
# Documentation: http://prefetch.net/articles/checkcertificate.html
#
# Author: Matty < matty at prefetch dot net >
#
# Last Updated: 11-12-2020
#
# Revision History:
#
# Version 4.14
# - Fixed HOST / PORT discovery @mhow2
#
# Version 4.13
# - Reverted the file checking logic which breaks $RETCODE
#
# Version 4.12
# - Fixed various logic errors and typos -- Daniel Lewart
#
# Version 4.10
# - Replace tabs with spaces
# - More shllcheck cleanup work
# - Remove unused DEBUG variable
# - Fixed an innocuous whitespace bug in TLSFLAG variable creation
# - Set the default TLS version to 1.1 (can be overridden with -v)
# - Switched openssl CLI options to use an array. The reasons why
# are documented here: http://mywiki.wooledge.org/BashFAQ/050
#
# Version 4.9
# - Add a signal handler to call the cleanup funtion
# if the script doesn't exit() cleanly -- Timothe Litt
#
# Version 4.8
# - More mail client fixes
#
# Version 4.7
# - Revert SENDER to ""
# - More shellcheck cleanup
#
# Version 4.6
# - Fixed programming logic error
#
# Version 4.5
# - Re-work mailx support for FreeBSD
# - More shellcheck fixes
#
# Version 4.4
# - Use command -v instead of which utility to satisfy shellcheck.
# - Fix unquoted MAIL and MAILMODE variables in help output
# - More shellcheck fixes
#
# Version 4.3
# - Fixed a typo in the program version
#
# Version 4.2
# - Change CERTDAYS to CERTDIFF in the e-mail subject.
#
# Version 4.1
# - Fix usage output
#
# Version 4.0
# - Updated the script syntax to align with UNIX shell programming
# - Check for DNS resolution failures
# - First round of updates to make shellcheck happy
# - Rework the logic to call mailx.
# - Print the version with the "-V" option.
# - Define the version in the PROGRAMVERSION variable
#
# Version 3.31
# - Fixed the test for the -servername flag -- Kitson Consulting.
#
# Version 3.30
# - Use highest returncode for Nagios output -- Marcel Pennewiss
# - Set RETCODE to 3 (unknown) if a certificate file does not exist -- Marcel Pennewiss
# - Add a "-d" option to specify a directory or file mask pattern -- Marcel Pennewiss
# - Add a "-N" option to create summarized Nagios output -- Marcel Pennewiss
# - Cleaned up many formatting -- Marcel Pennewiss
#
# Versione 3.29a
# - Added option to specify email sender address
#
# Version 3.29
# - Add the openssl -servername flag if it shows up in help.
#
# Version 3.28
# - Added a DEBUG option to assist with debugging folks who use the script
#
# Version 3.27
# - Allow white spaces to exist in the certificate file list
# - Add an additional check to pick up bad / non-existent certificates
# - Add a check to look for the existence of a mail program. Error out if it's not present.
# - Enable the TLS -servername extension by default - Juergen Knaack & Johan Denoyer
#
# Version 3.26
# - Allow the certificate type (PEM, DER, NET) to be passed on the command line
#
# Version 3.25
# - Check for "no route to host" errors -- Dan Doyle
# - Set RETCODE to 3 (unknown) if a connection error occurs -- Dan Doyle
# - Documentation fixes
#
# Version 3.24
# - Utilize the -clcerts option to limit the results to client certificates - Eitan Katznelson
#
# Version 3.23
# - Fixed typo in date2julian routine -- Ken Cook
#
# Version 3.22
# - Change the validation option to "-V"
# - Add a "-v" option to specify a specific protocol version (ssl2, ssl3 or tls)
#
# Version 3.21
# - Adjust e-mail checking to avoid exiting if notifications aren't enabled -- Nick Anderson
# - Added the number of days until expiration to the Nagios output -- Nick Anderson
#
# Version 3.20
# - Fixed a bug in certificate length checking -- Tim Nowaczyk
#
# Version 3.19
# - Added check to verify the certificate retrieved is valid
#
# Version 3.18
# - Add support for connecting to FTP servers -- Paul A Sand
#
# Version 3.17
# - Add support for connecting to imap servers -- Joerg Pareigis
#
# Version 3.16
# - Add support for connecting to the mail sbmission port -- Luis E. Munoz
#
# Version 3.15
# - Adjusted the file checking logic to use the correct certificate -- Maciej Szudejko
# - Add sbin to the default search paths for OpenBSD compatibility -- Alex Popov
# - Use cut instead of substring processing to ensure compatibility -- Alex Popov
#
# Version 3.14
# - Fixed the Common Name parser to handle DN's where the CN is not the last item
# eg. EmailAddr -- Jason Brothers
# - Added the ability to grab the serial number -- Jason Brothers
# - Added the "-b" option to print results without a header -- Jason Brothers
# - Added the "-v" option for certificate validation -- Jason Brothers
#
# Version 3.13
# - Updated the subject line to include the hostname as well as
# the common name embedded in the X509 certificate (if it's
# available) -- idea proposed by Mike Burns
#
# Version 3.12
# - Updated the license to allow redistribution and modification
#
# Version 3.11
# - Added ability to comment out lines in files passed
# to the "-f" option -- Brett Stauner
# - Fixed comment next to file processing logic
#
# Version 3.10
# - Fixed POP3 port -- Simon Matter
#
# Version 3.9
# - Switched binary location logic to use which utility
#
# Version 3.8
# - Fixed display on 80 column displays
# - Cleaned up the formatting
#
# Version 3.7
# - Fixed bug in NAGIOS tests -- Ben Allen
#
# Version 3.6
# - Added support for certificates stored in PKCS#12 databases -- Ken Gallo
# - Cleaned up comments
# - Adjusted variables to be more consistent
#
# Version 3.5
# - Added support for NAGIOS -- Quanah Gibson-Mount
# - Added additional checks for mail -- Quanah Gibson-Mount
# - Convert tabs to spaces -- Quanah Gibson-Mount
# - Cleaned up usage() routine
# - Added additional checks for openssl
#
# Version 3.4
# - Added a missing "{" to line 364 -- Ken Gallo
# - Move mktemp to the start of the main body to avoid errors
# - Adjusted default binary paths to make sure the script just works
# w/ Solaris, BSD and Linux hosts
#
# Version 3.3
# - Added common name from X.509 certificate file to E-mail body / header -- Doug Curtis
# - Fixed several documentation errors
# - Use mktemp to create temporary files
# - Convert printf, sed and awk to variables
# - Check for printf, sed, awk and mktemp binaries
# - Add additional logic to make sure mktemp returned a valid temporary file
#
# Version 3.2
# - Added option to list certificates in the file passed to "-f".
#
# Version 3.1
# - Added handling for starttls for smtp -- Marco Amrein
# - Added handling for starttls for pop3 (without s) -- Marco Amrein
# - Removed extra spacing at end of script
#
# Version 3.0
# - Added "-i" option to print certificate issuer
# - Removed $0 from Subject line of outbound e-mails
# - Fixed some typographical errors
# - Removed redundant "-b" option
#
# Version 2.0
# - Fixed an issue with e-mails formatting incorrectly
# - Added additional space to host column -- Darren-Perot Spruell
# - Replaced GNU date dependency with CHRIS F. A. JOHNSON's
# date2julian shell function. This routine can be found on
# page 170 of Chris's book "Shell Scripting Recipes: A
# Problem-Solution Approach," ISBN #1590594711. Julian function
# was created based on a post to comp.unix.shell by Tapani Tarvainen.
# - Cleaned up function descriptions
# - Removed several lines of redundant code
# - Adjusted the help message
#
# Version 1.1
# - Added "-c" flag to report expiration status of a PEM encoded
# certificate -- Hampus Lundqvist
# - Updated the prints messages to display the reason a connection
# failed (connection refused, connection timeout, bad cert, etc)
# - Updated the GNU date checking routines
# - Added checks for each binary required
# - Added checks for connection timeouts
# - Added checks for GNU date
# - Added a "-h" option
# - Cleaned up the documentation
#
# Version 1.0
# Initial Release
#
# Purpose:
# ssl-cert-check checks to see if a digital certificate in X.509 format
# has expired. ssl-cert-check can be run in interactive and batch mode,
# and provides facilities to alarm if a certificate is about to expire.
#
# License:
# 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.
#
# Requirements:
# Requires openssl
#
# Installation:
# Copy the shell script to a suitable location
#
# Tested platforms:
# -- Solaris 9 using /bin/bash
# -- Solaris 10 using /bin/bash
# -- OS X 10.4.2 using /bin/bash
# -- OpenBSD using /bin/sh
# -- FreeBSD using /bin/sh
# -- Centos Linux 3, 4, 5 & 6 using /bin/bash
# -- Redhat Enterprise Linux 3, 4, 5 & 6 using /bin/bash
# -- Gentoo using /bin/bash
#
# Usage:
# Refer to the usage() sub-routine, or invoke ssl-cert-check
# with the "-h" option.
#
# Examples:
# Please refer to the following site for documentation and examples:
# http://prefetch.net/articles/checkcertificate.html
# Cleanup temp files if they exist
trap cleanup EXIT INT TERM QUIT
PATH=/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/ssl/bin:/usr/sfw/bin
export PATH
# Who to page when an expired certificate is detected (cmdline: -e)
ADMIN="root"
# Email sender address for alarm notifications
SENDER=""
# Number of days in the warning threshhold (cmdline: -x)
WARNDAYS=30
# If QUIET is set to TRUE, don't print anything on the console (cmdline: -q)
QUIET="FALSE"
# Don't send E-mail by default (cmdline: -a)
ALARM="FALSE"
# Don't run as a Nagios plugin by default (cmdline: -n)
NAGIOS="FALSE"
# Don't summarize Nagios output by default (cmdline: -N)
NAGIOSSUMMARY="FALSE"
# NULL out the PKCSDBPASSWD variable for later use (cmdline: -k)
PKCSDBPASSWD=""
# Type of certificate (PEM, DER, NET) (cmdline: -t)
CERTTYPE="pem"
# Location of system binaries
AWK=$(command -v awk)
DATE=$(command -v date)
GREP=$(command -v grep)
OPENSSL=$(command -v openssl)
PRINTF=$(command -v printf)
SED=$(command -v sed)
MKTEMP=$(command -v mktemp)
FIND=$(command -v find)
# Try to find a mail client
if [ -f /usr/bin/mailx ]; then
MAIL="/usr/bin/mailx"
MAILMODE="mailx"
elif [ -f /bin/mail ]; then
MAIL="/bin/mail"
MAILMODE="mail"
elif [ -f /usr/bin/mail ]; then
MAIL="/usr/bin/mail"
MAILMODE="mail"
elif [ -f /sbin/mail ]; then
MAIL="/sbin/mail"
MAILMODE="mail"
elif [ -f /usr/sbin/mail ]; then
MAIL="/usr/sbin/mail"
MAILMODE="mail"
elif [ -f /usr/sbin/sendmail ]; then
MAIL="/usr/sbin/sendmail"
MAILMODE="sendmail"
else
MAIL="cantfindit"
MAILMODE="cantfindit"
fi
# Return code used by nagios. Initialize to 0.
RETCODE=0
# Certificate counters and minimum difference. Initialize to 0.
SUMMARY_VALID=0
SUMMARY_WILL_EXPIRE=0
SUMMARY_EXPIRED=0
SUMMARY_MIN_DIFF=0
SUMMARY_MIN_DATE=
SUMMARY_MIN_HOST=
SUMMARY_MIN_PORT=
# Set the default umask to be somewhat restrictive
umask 077
#####################################################
# Purpose: Remove temporary files if the script doesn't
# exit() cleanly
#####################################################
cleanup() {
if [ -f "${CERT_TMP}" ]; then
rm -f "${CERT_TMP}"
fi
if [ -f "${ERROR_TMP}" ]; then
rm -f "${ERROR_TMP}"
fi
}
#####################################################
### Send email
### Accepts three parameters:
### $1 -> sender email address
### $2 -> email to send mail
### $3 -> Subject
### $4 -> Message
#####################################################
send_mail() {
FROM="${1}"
TO="${2}"
SUBJECT="${3}"
MSG="${4}"
case "${MAILMODE}" in
"mail")
echo "$MSG" | "${MAIL}" -r "$FROM" -s "$SUBJECT" "$TO"
;;
"mailx")
echo "$MSG" | "${MAIL}" -s "$SUBJECT" "$TO"
;;
"sendmail")
(echo "Subject:$SUBJECT" && echo "TO:$TO" && echo "FROM:$FROM" && echo "$MSG") | "${MAIL}" "$TO"
;;
"*")
echo "ERROR: You enabled automated alerts, but the mail binary could not be found."
echo "FIX: Please modify the \${MAIL} and \${MAILMODE} variable in the program header."
exit 1
;;
esac
}
#############################################################################
# Purpose: Convert a date from MONTH-DAY-YEAR to Julian format
# Acknowledgements: Code was adapted from examples in the book
# "Shell Scripting Recipes: A Problem-Solution Approach"
# ( ISBN 1590594711 )
# Arguments:
# $1 -> Month (e.g., 06)
# $2 -> Day (e.g., 08)
# $3 -> Year (e.g., 2006)
#############################################################################
date2julian() {
if [ "${1}" != "" ] && [ "${2}" != "" ] && [ "${3}" != "" ]; then
## Since leap years add aday at the end of February,
## calculations are done from 1 March 0000 (a fictional year)
d2j_tmpmonth=$((12 * $3 + $1 - 3))
## If it is not yet March, the year is changed to the previous year
d2j_tmpyear=$(( d2j_tmpmonth / 12))
## The number of days from 1 March 0000 is calculated
## and the number of days from 1 Jan. 4713BC is added
echo $(( (734 * d2j_tmpmonth + 15) / 24
- 2 * d2j_tmpyear + d2j_tmpyear/4
- d2j_tmpyear/100 + d2j_tmpyear/400 + $2 + 1721119 ))
else
echo 0
fi
}
#############################################################################
# Purpose: Convert a string month into an integer representation
# Arguments:
# $1 -> Month name (e.g., Sep)
#############################################################################
getmonth()
{
case ${1} in
Jan) echo 1 ;;
Feb) echo 2 ;;
Mar) echo 3 ;;
Apr) echo 4 ;;
May) echo 5 ;;
Jun) echo 6 ;;
Jul) echo 7 ;;
Aug) echo 8 ;;
Sep) echo 9 ;;
Oct) echo 10 ;;
Nov) echo 11 ;;
Dec) echo 12 ;;
*) echo 0 ;;
esac
}
#############################################################################
# Purpose: Calculate the number of seconds between two dates
# Arguments:
# $1 -> Date #1
# $2 -> Date #2
#############################################################################
date_diff()
{
if [ "${1}" != "" ] && [ "${2}" != "" ]; then
echo $((${2} - ${1}))
else
echo 0
fi
}
#####################################################################
# Purpose: Print a line with the expiraton interval
# Arguments:
# $1 -> Hostname
# $2 -> TCP Port
# $3 -> Status of certification (e.g., expired or valid)
# $4 -> Date when certificate will expire
# $5 -> Days left until the certificate will expire
# $6 -> Issuer of the certificate
# $7 -> Common Name
# $8 -> Serial Number
#####################################################################
prints()
{
if [ "${NAGIOSSUMMARY}" = "TRUE" ]; then
return
fi
if [ "${QUIET}" != "TRUE" ] && [ "${ISSUER}" = "TRUE" ] && [ "${VALIDATION}" != "TRUE" ]; then
MIN_DATE=$(echo "$4" | "${AWK}" '{ printf "%3s %2d %4d", $1, $2, $4 }')
if [ "${NAGIOS}" = "TRUE" ]; then
${PRINTF} "%-35s %-17s %-8s %-11s %s\n" "$1:$2" "$6" "$3" "$MIN_DATE" "|days=$5"
else
${PRINTF} "%-35s %-17s %-8s %-11s %4d\n" "$1:$2" "$6" "$3" "$MIN_DATE" "$5"
fi
elif [ "${QUIET}" != "TRUE" ] && [ "${ISSUER}" = "TRUE" ] && [ "${VALIDATION}" = "TRUE" ]; then
${PRINTF} "%-35s %-35s %-32s %-17s\n" "$1:$2" "$7" "$8" "$6"
elif [ "${QUIET}" != "TRUE" ] && [ "${VALIDATION}" != "TRUE" ]; then
MIN_DATE=$(echo "$4" | "${AWK}" '{ printf "%3s %2d, %4d", $1, $2, $4 }')
if [ "${NAGIOS}" = "TRUE" ]; then
${PRINTF} "%-47s %-12s %-12s %s\n" "$1:$2" "$3" "$MIN_DATE" "|days=$5"
else
${PRINTF} "%-47s %-12s %-12s %4d\n" "$1:$2" "$3" "$MIN_DATE" "$5"
fi
elif [ "${QUIET}" != "TRUE" ] && [ "${VALIDATION}" = "TRUE" ]; then
${PRINTF} "%-35s %-35s %-32s\n" "$1:$2" "$7" "$8"
fi
}
####################################################
# Purpose: Print a heading with the relevant columns
# Arguments:
# None
####################################################
print_heading()
{
if [ "${NOHEADER}" != "TRUE" ]; then
if [ "${QUIET}" != "TRUE" ] && [ "${ISSUER}" = "TRUE" ] && [ "${NAGIOS}" != "TRUE" ] && [ "${VALIDATION}" != "TRUE" ]; then
${PRINTF} "\n%-35s %-17s %-8s %-11s %-4s\n" "Host" "Issuer" "Status" "Expires" "Days"
echo "----------------------------------- ----------------- -------- ----------- ----"
elif [ "${QUIET}" != "TRUE" ] && [ "${ISSUER}" = "TRUE" ] && [ "${NAGIOS}" != "TRUE" ] && [ "${VALIDATION}" = "TRUE" ]; then
${PRINTF} "\n%-35s %-35s %-32s %-17s\n" "Host" "Common Name" "Serial #" "Issuer"
echo "----------------------------------- ----------------------------------- -------------------------------- -----------------"
elif [ "${QUIET}" != "TRUE" ] && [ "${NAGIOS}" != "TRUE" ] && [ "${VALIDATION}" != "TRUE" ]; then
${PRINTF} "\n%-47s %-12s %-12s %-4s\n" "Host" "Status" "Expires" "Days"
echo "----------------------------------------------- ------------ ------------ ----"
elif [ "${QUIET}" != "TRUE" ] && [ "${NAGIOS}" != "TRUE" ] && [ "${VALIDATION}" = "TRUE" ]; then
${PRINTF} "\n%-35s %-35s %-32s\n" "Host" "Common Name" "Serial #"
echo "----------------------------------- ----------------------------------- --------------------------------"
fi
fi
}
####################################################
# Purpose: Print a summary for nagios
# Arguments:
# None
####################################################
print_summary()
{
if [ "${NAGIOSSUMMARY}" != "TRUE" ]; then
return
fi
if [ ${SUMMARY_WILL_EXPIRE} -eq 0 ] && [ ${SUMMARY_EXPIRED} -eq 0 ]; then
${PRINTF} "%s valid certificate(s)|days=%s\n" "${SUMMARY_VALID}" "${SUMMARY_MIN_DIFF}"
elif [ ${SUMMARY_EXPIRED} -ne 0 ]; then
${PRINTF} "%s certificate(s) expired (%s:%s on %s)|days=%s\n" "${SUMMARY_EXPIRED}" "${SUMMARY_MIN_HOST}" "${SUMMARY_MIN_PORT}" "${SUMMARY_MIN_DATE}" "${SUMMARY_MIN_DIFF}"
elif [ ${SUMMARY_WILL_EXPIRE} -ne 0 ]; then
${PRINTF} "%s certificate(s) will expire (%s:%s on %s)|days=%s\n" "${SUMMARY_WILL_EXPIRE}" "${SUMMARY_MIN_HOST}" "${SUMMARY_MIN_PORT}" "${SUMMARY_MIN_DATE}" "${SUMMARY_MIN_DIFF}"
fi
}
#############################################################
# Purpose: Set returncode to value if current value is lower
# Arguments:
# $1 -> New returncorde
#############################################################
set_returncode()
{
if [ "${RETCODE}" -lt "${1}" ]; then
RETCODE="${1}"
fi
}
########################################################################
# Purpose: Set certificate counters and informations for nagios summary
# Arguments:
# $1 -> Status of certificate (0: valid, 1: will expire, 2: expired)
# $2 -> Hostname
# $3 -> TCP Port
# $4 -> Date when certificate will expire
# $5 -> Days left until the certificate will expire
########################################################################
set_summary()
{
if [ "${1}" -eq 0 ]; then
SUMMARY_VALID=$((SUMMARY_VALID+1))
elif [ "${1}" -eq 1 ]; then
SUMMARY_WILL_EXPIRE=$((SUMMARY_WILL_EXPIRE+1))
else
SUMMARY_EXPIRED=$((SUMMARY_EXPIRED+1))
fi
if [ "${5}" -lt "${SUMMARY_MIN_DIFF}" ] || [ "${SUMMARY_MIN_DIFF}" -eq 0 ]; then
SUMMARY_MIN_DATE="${4}"
SUMMARY_MIN_DIFF="${5}"
SUMMARY_MIN_HOST="${2}"
SUMMARY_MIN_PORT="${3}"
fi
}
##########################################
# Purpose: Describe how the script works
# Arguments:
# None
##########################################
usage()
{
echo "Usage: $0 [ -e email address ] [-E sender email address] [ -x days ] [-q] [-a] [-b] [-h] [-i] [-n] [-N] [-v]"
echo " { [ -s common_name ] && [ -p port] } || { [ -f cert_file ] } || { [ -c cert file ] } || { [ -d cert dir ] }"
echo ""
echo " -a : Send a warning message through E-mail"
echo " -b : Will not print header"
echo " -c cert file : Print the expiration date for the PEM or PKCS12 formatted certificate in cert file"
echo " -d cert directory : Print the expiration date for the PEM or PKCS12 formatted certificates in cert directory"
echo " -e E-mail address : E-mail address to send expiration notices"
echo " -E E-mail sender : E-mail address of the sender"
echo " -f cert file : File with a list of FQDNs and ports"
echo " -h : Print this screen"
echo " -i : Print the issuer of the certificate"
echo " -k password : PKCS12 file password"
echo " -n : Run as a Nagios plugin"
echo " -N : Run as a Nagios plugin and output one line summary (implies -n, requires -f or -d)"
echo " -p port : Port to connect to (interactive mode)"
echo " -q : Don't print anything on the console"
echo " -s commmon name : Server to connect to (interactive mode)"
echo " -S : Print validation information"
echo " -t type : Specify the certificate type"
echo " -V : Print version information"
echo " -x days : Certificate expiration interval (eg. if cert_date < days)"
echo ""
}
##########################################################################
# Purpose: Connect to a server ($1) and port ($2) to see if a certificate
# has expired
# Arguments:
# $1 -> Server name
# $2 -> TCP port to connect to
##########################################################################
check_server_status() {
PORT="$2"
case "$PORT" in
smtp|25|submission|587) TLSFLAG="-starttls smtp";;
pop3|110) TLSFLAG="-starttls pop3";;
imap|143) TLSFLAG="-starttls imap";;
ftp|21) TLSFLAG="-starttls ftp";;
xmpp|5222) TLSFLAG="-starttls xmpp";;
xmpp-server|5269) TLSFLAG="-starttls xmpp-server";;
irc|194) TLSFLAG="-starttls irc";;
postgres|5432) TLSFLAG="-starttls postgres";;
mysql|3306) TLSFLAG="-starttls mysql";;
lmtp|24) TLSFLAG="-starttls lmtp";;
nntp|119) TLSFLAG="-starttls nntp";;
sieve|4190) TLSFLAG="-starttls sieve";;
ldap|389) TLSFLAG="-starttls ldap";;
*) TLSFLAG="";;
esac
if [ "${TLSSERVERNAME}" = "FALSE" ]; then
OPTIONS="-connect ${1}:${2} $TLSFLAG"
else
OPTIONS="-connect ${1}:${2} -servername ${1} $TLSFLAG"
fi
echo "" | "${OPENSSL}" s_client $OPTIONS 2> "${ERROR_TMP}" 1> "${CERT_TMP}"
if "${GREP}" -i "Connection refused" "${ERROR_TMP}" > /dev/null; then
prints "${1}" "${2}" "Connection refused" "Unknown"
set_returncode 3
elif "${GREP}" -i "No route to host" "${ERROR_TMP}" > /dev/null; then
prints "${1}" "${2}" "No route to host" "Unknown"
set_returncode 3
elif "${GREP}" -i "gethostbyname failure" "${ERROR_TMP}" > /dev/null; then
prints "${1}" "${2}" "Cannot resolve domain" "Unknown"
set_returncode 3
elif "${GREP}" -i "Operation timed out" "${ERROR_TMP}" > /dev/null; then
prints "${1}" "${2}" "Operation timed out" "Unknown"
set_returncode 3
elif "${GREP}" -i "ssl handshake failure" "${ERROR_TMP}" > /dev/null; then
prints "${1}" "${2}" "SSL handshake failed" "Unknown"
set_returncode 3
elif "${GREP}" -i "connect: Connection timed out" "${ERROR_TMP}" > /dev/null; then
prints "${1}" "${2}" "Connection timed out" "Unknown"
set_returncode 3
elif "${GREP}" -i "Name or service not known" "${ERROR_TMP}" > /dev/null; then
prints "${1}" "${2}" "Unable to resolve the DNS name ${1}" "Unknown"
set_returncode 3
else
check_file_status "${CERT_TMP}" "${1}" "${2}"
fi
}
#####################################################
### Check the expiration status of a certificate file
### Accepts three parameters:
### $1 -> certificate file to process
### $2 -> Server name
### $3 -> Port number of certificate
#####################################################
check_file_status() {
CERTFILE="${1}"
HOST="${2}"
PORT="${3}"
### Check to make sure the certificate file exists
if [ ! -r "${CERTFILE}" ] || [ ! -s "${CERTFILE}" ]; then
echo "ERROR: The file named ${CERTFILE} is unreadable or doesn't exist"
echo "ERROR: Please check to make sure the certificate for ${HOST}:${PORT} is valid"
set_returncode 3
return
fi
### Grab the expiration date from the X.509 certificate
if [ "${PKCSDBPASSWD}" != "" ]; then
# Extract the certificate from the PKCS#12 database, and
# send the informational message to /dev/null
"${OPENSSL}" pkcs12 -nokeys -in "${CERTFILE}" \
-out "${CERT_TMP}" -clcerts -password pass:"${PKCSDBPASSWD}" 2> /dev/null
# Extract the expiration date from the certificate
CERTDATE=$("${OPENSSL}" x509 -in "${CERT_TMP}" -enddate -noout | \
"${SED}" 's/notAfter\=//')
# Extract the issuer from the certificate
CERTISSUER=$("${OPENSSL}" x509 -in "${CERT_TMP}" -issuer -noout | \
"${AWK}" 'BEGIN {RS=", " } $0 ~ /^O =/
{ print substr($0,5,17)}')
### Grab the common name (CN) from the X.509 certificate
COMMONNAME=$("${OPENSSL}" x509 -in "${CERT_TMP}" -subject -noout | \
"${SED}" -e 's/.*CN = //' | \
"${SED}" -e 's/, .*//')
### Grab the serial number from the X.509 certificate
SERIAL=$("${OPENSSL}" x509 -in "${CERT_TMP}" -serial -noout | \
"${SED}" -e 's/serial=//')
else
# Extract the expiration date from the ceriticate
CERTDATE=$("${OPENSSL}" x509 -in "${CERTFILE}" -enddate -noout -inform "${CERTTYPE}" | \
"${SED}" 's/notAfter\=//')
# Extract the issuer from the certificate
CERTISSUER=$("${OPENSSL}" x509 -in "${CERTFILE}" -issuer -noout -inform "${CERTTYPE}" | \
"${AWK}" 'BEGIN {RS=", " } $0 ~ /^O =/ { print substr($0,5,17)}')
### Grab the common name (CN) from the X.509 certificate
COMMONNAME=$("${OPENSSL}" x509 -in "${CERTFILE}" -subject -noout -inform "${CERTTYPE}" | \
"${SED}" -e 's/.*CN = //' | \
"${SED}" -e 's/, .*//')
### Grab the serial number from the X.509 certificate
SERIAL=$("${OPENSSL}" x509 -in "${CERTFILE}" -serial -noout -inform "${CERTTYPE}" | \
"${SED}" -e 's/serial=//')
fi
### Split the result into parameters, and pass the relevant pieces to date2julian
set -- ${CERTDATE}
MONTH=$(getmonth "${1}")
# Convert the date to seconds, and get the diff between NOW and the expiration date
CERTJULIAN=$(date2julian "${MONTH#0}" "${2#0}" "${4}")
CERTDIFF=$(date_diff "${NOWJULIAN}" "${CERTJULIAN}")
if [ "${CERTDIFF}" -lt 0 ]; then
if [ "${ALARM}" = "TRUE" ]; then
send_mail "${SENDER}" "${ADMIN}" "Certificate for ${HOST} \"(CN: ${COMMONNAME})\" has expired!" \
"The SSL certificate for ${HOST} \"(CN: ${COMMONNAME})\" has expired!"
fi
prints "${HOST}" "${PORT}" "Expired" "${CERTDATE}" "${CERTDIFF}" "${CERTISSUER}" "${COMMONNAME}" "${SERIAL}"
RETCODE_LOCAL=2
elif [ "${CERTDIFF}" -lt "${WARNDAYS}" ]; then
if [ "${ALARM}" = "TRUE" ]; then
send_mail "${SENDER}" "${ADMIN}" "Certificate for ${HOST} \"(CN: ${COMMONNAME})\" will expire in ${CERTDIFF} days or less" \
"The SSL certificate for ${HOST} \"(CN: ${COMMONNAME})\" will expire on ${CERTDATE}"
fi
prints "${HOST}" "${PORT}" "Expiring" "${CERTDATE}" "${CERTDIFF}" "${CERTISSUER}" "${COMMONNAME}" "${SERIAL}"
RETCODE_LOCAL=1
else
prints "${HOST}" "${PORT}" "Valid" "${CERTDATE}" "${CERTDIFF}" "${CERTISSUER}" "${COMMONNAME}" "${SERIAL}"
RETCODE_LOCAL=0
fi
set_returncode "${RETCODE_LOCAL}"
MIN_DATE=$(echo "${CERTDATE}" | "${AWK}" '{ print $1, $2, $4 }')
set_summary "${RETCODE_LOCAL}" "${HOST}" "${PORT}" "${MIN_DATE}" "${CERTDIFF}"
}
#################################
### Start of main program
#################################
while getopts abc:d:e:E:f:hik:nNp:qs:St:Vx: option
do
case "${option}" in
a) ALARM="TRUE";;
b) NOHEADER="TRUE";;
c) CERTFILE=${OPTARG};;
d) CERTDIRECTORY=${OPTARG};;
e) ADMIN=${OPTARG};;
E) SENDER=${OPTARG};;
f) SERVERFILE=$OPTARG;;
h) usage
exit 1;;
i) ISSUER="TRUE";;
k) PKCSDBPASSWD=${OPTARG};;
n) NAGIOS="TRUE";;
N) NAGIOS="TRUE"
NAGIOSSUMMARY="TRUE";;
p) PORT=$OPTARG;;
q) QUIET="TRUE";;
s) HOST=$OPTARG;;
S) VALIDATION="TRUE";;
t) CERTTYPE=$OPTARG;;
V) echo "${PROGRAMVERSION}"
exit 0
;;
x) WARNDAYS=$OPTARG;;
\?) usage
exit 1;;
esac
done
### Check to make sure a openssl utility is available
if [ ! -f "${OPENSSL}" ]; then
echo "ERROR: The openssl binary does not exist in ${OPENSSL}."
echo "FIX: Please modify the \${OPENSSL} variable in the program header."
exit 1
fi
### Check to make sure a date utility is available
if [ ! -f "${DATE}" ]; then
echo "ERROR: The date binary does not exist in ${DATE} ."
echo "FIX: Please modify the \${DATE} variable in the program header."
exit 1
fi
### Check to make sure a grep and find utility is available
if [ ! -f "${GREP}" ] || [ ! -f "${FIND}" ]; then
echo "ERROR: Unable to locate the grep and find binary."
echo "FIX: Please modify the \${GREP} and \${FIND} variables in the program header."
exit 1
fi
### Check to make sure the mktemp and printf utilities are available
if [ ! -f "${MKTEMP}" ] || [ -z "${PRINTF}" ]; then
echo "ERROR: Unable to locate the mktemp or printf binary."
echo "FIX: Please modify the \${MKTEMP} and \${PRINTF} variables in the program header."
exit 1
fi
### Check to make sure the sed and awk binaries are available
if [ ! -f "${SED}" ] || [ ! -f "${AWK}" ]; then
echo "ERROR: Unable to locate the sed or awk binary."
echo "FIX: Please modify the \${SED} and \${AWK} variables in the program header."
exit 1
fi
### Check to make sure a mail client is available it automated notifications are requested
if [ "${ALARM}" = "TRUE" ] && [ ! -f "${MAIL}" ]; then
echo "ERROR: You enabled automated alerts, but the mail binary could not be found."
echo "FIX: Please modify the ${MAIL} variable in the program header."
exit 1
fi
# Send along the servername when TLS is used
if ${OPENSSL} s_client -help 2>&1 | grep '-servername' > /dev/null; then
TLSSERVERNAME="TRUE"
else
TLSSERVERNAME="FALSE"
fi
# Place to stash temporary files
CERT_TMP=$($MKTEMP /var/tmp/cert.XXXXXX)
ERROR_TMP=$($MKTEMP /var/tmp/error.XXXXXX)
### Baseline the dates so we have something to compare to
MONTH=$(${DATE} "+%m")
DAY=$(${DATE} "+%d")
YEAR=$(${DATE} "+%Y")
NOWJULIAN=$(date2julian "${MONTH#0}" "${DAY#0}" "${YEAR}")
### Touch the files prior to using them
if [ -n "${CERT_TMP}" ] && [ -n "${ERROR_TMP}" ]; then
touch "${CERT_TMP}" "${ERROR_TMP}"
else
echo "ERROR: Problem creating temporary files"
echo "FIX: Check that mktemp works on your system"
exit 1
fi
### If a HOST was passed on the cmdline, use that value
if [ "${HOST}" != "" ]; then
print_heading
check_server_status "${HOST}" "${PORT:=443}"
print_summary
### If a file is passed to the "-f" option on the command line, check
### each certificate or server / port combination in the file to see if
### they are about to expire
elif [ -f "${SERVERFILE}" ]; then
print_heading
IFS=$'\n'
for LINE in $(grep -E -v '(^#|^$)' "${SERVERFILE}")
do
HOST=${LINE%% *}
PORT=${LINE##* }
IFS=" "
if [ "$PORT" = "FILE" ]; then
check_file_status "${HOST}" "FILE" "${HOST}"
else
check_server_status "${HOST}" "${PORT}"
fi
done
IFS="${OLDIFS}"
print_summary
### Check to see if the certificate in CERTFILE is about to expire
elif [ "${CERTFILE}" != "" ]; then
print_heading
check_file_status "${CERTFILE}" "FILE" "${CERTFILE}"
print_summary
### Check to see if the certificates in CERTDIRECTORY are about to expire
elif [ "${CERTDIRECTORY}" != "" ] && ("${FIND}" -L "${CERTDIRECTORY}" -type f > /dev/null 2>&1); then
print_heading
for FILE in $("${FIND}" -L "${CERTDIRECTORY}" -type f); do
check_file_status "${FILE}" "FILE" "${FILE}"
done
print_summary
### There was an error, so print a detailed usage message and exit
else
usage
exit 1
fi
### Exit with a success indicator
if [ "${NAGIOS}" = "TRUE" ]; then
exit "${RETCODE}"
else
exit 0
fi