The Bourne shell script to query for certs
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SSL cert project implementation plan
The script was sourced here : https://prefetch.net/articles/checkcertificate.html
ssl-cert-check -i -f ssldomains
prefetch.com 443
#!/usr/bin/env bash # # 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 < matty91 at gmail dot com > # # Current Version: 3.30 # # Revision History: # # 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 # # Last Updated: 12-12-2016 # # 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 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="postmaster@localhost.localdomain" # 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" # Protocol version to use (cmdline: -v) VERSION="" # Enable debugging DEBUG=0 # Location of system binaries AWK=$(which awk) DATE=$(which date) GREP=$(which grep) OPENSSL=$(which openssl) PRINTF=$(which printf) SED=$(which sed) MKTEMP=$(which mktemp) FIND=$(which 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 ##################################################### ### 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" | "mailx") echo "$MSG" | ${MAIL} -r $FROM -s "$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 # $6 -> Issuer of the certificate ##################################################################### prints() { if [ "${NAGIOSSUMMARY}" == "TRUE" ] then return fi if [ "${QUIET}" != "TRUE" ] && [ "${ISSUER}" = "TRUE" ] && [ "${VALIDATION}" != "TRUE" ] then MIN_DATE=$(echo $4 | ${AWK} '{ print $1, $2, $4 }') if [ "${NAGIOS}" == "TRUE" ] then ${PRINTF} "%-35s %-17s %-8s %-11s %-4s %-30s\n" "$1:$2" "$6" "$3" "$MIN_DATE" \|days="$5" else ${PRINTF} "%-35s %-17s %-8s %-11s %-4s %-30s\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} '{ print $1, $2, $4 }') if [ "${NAGIOS}" == "TRUE" ] then ${PRINTF} "%-47s %-12s %-12s %-4s %-30s\n" "$1:$2" "$3" "$MIN_DATE" \|days="$5" else ${PRINTF} "%-47s %-12s %-12s %-4s %-30s\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_M IN_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 " -s commmon name : Server to connect to (interactive mode)" echo " -t type : Specify the certificate type" echo " -q : Don't print anything on the console" echo " -v : Specify a specific protocol version to use (tls, ssl2, ssl3)" echo " -V : Only print validation data" 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 # $2 -> TCP port to connect to ########################################################################## check_server_status() { if [ "_${2}" = "_smtp" -o "_${2}" = "_25" ] then TLSFLAG="-starttls smtp" elif [ "_${2}" = "_ftp" -o "_${2}" = "_21" ] then TLSFLAG="-starttls ftp" elif [ "_${2}" = "_pop3" -o "_${2}" = "_110" ] then TLSFLAG="-starttls pop3" elif [ "_${2}" = "_imap" -o "_${2}" = "_143" ] then TLSFLAG="-starttls imap" elif [ "_${2}" = "_submission" -o "_${2}" = "_587" ] then TLSFLAG="-starttls smtp -port ${2}" else TLSFLAG="" fi if [ "${VERSION}" != "" ] then VER="-${VERSION}" fi if [ "${TLSSERVERNAME}" = "TRUE" ] then TLSFLAG="${TLSFLAG} -servername $1" fi echo "" | ${OPENSSL} s_client -crlf ${VER} -connect ${1}:${2} ${TLSFLAG} 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 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($0,3,17)}') ### Grab the common name (CN) from the X.509 certificate COMMONNAME=$(${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($0,3,17)}') ### Grab the common name (CN) from the X.509 certificate COMMONNAME=$(${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 ${WARNDAYS}-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}" ${CERTDIFF} } ################################# ### Start of main program ################################# while getopts abinNv:e:E:f:c:d:hk:p:s:t:qx:V option do case "${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=$OPTARG;; s) HOST=$OPTARG;; t) CERTTYPE=$OPTARG;; q) QUIET="TRUE";; v) VERSION=$OPTARG;; V) VALIDATION="TRUE";; 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 greb 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} ] || [ ! -f ${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} ${YEAR}) ### Touch the files prior to using them if [ ! -z "${CERT_TMP}" ] && [ ! -z "${ERROR_TMP}" ] then touch ${CERT_TMP} ${ERROR_TMP} else echo "ERROR: Problem creating temporary files" echo "FIX: Check that mktemp works on your system" exit 1 fi ### If a HOST and PORT were passed on the cmdline, use those values if [ "${HOST}" != "" ] && [ "${PORT}" != "" ] then print_heading check_server_status "${HOST}" "${PORT}" print_summary ### If a file is passed to the "-f" option on the command line, check ### each certificate or server / port combination in the file to see if ### they are about to expire elif [ -f "${SERVERFILE}" ] then print_heading IFS=$'\n' for LINE in `egrep -v '(^#|^$)' ${SERVERFILE}` do HOST=${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 ### Remove the temporary files if [ $DEBUG == 1 ] then echo "DEBUG: Certificate temporary file:" cat ${CERT_TMP} echo "DEBUG: Runtime information file:" cat ${ERROR_TMP} fi rm -f ${CERT_TMP} ${ERROR_TMP} ### Exit with a success indicator if [ "${NAGIOS}" = "TRUE" ] then exit $RETCODE else exit 0 fi
