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956 lines
33 KiB
956 lines
33 KiB
2 years ago
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#!/usr/bin/env bash
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PROGRAMVERSION=4.14
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#
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# Program: SSL Certificate Check <ssl-cert-check>
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#
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# Source code home: https://github.com/Matty9191/ssl-cert-check
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#
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# Documentation: http://prefetch.net/articles/checkcertificate.html
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#
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# Author: Matty < matty at prefetch dot net >
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#
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# Last Updated: 11-12-2020
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#
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# Revision History:
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#
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# Version 4.14
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# - Fixed HOST / PORT discovery @mhow2
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#
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# Version 4.13
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# - Reverted the file checking logic which breaks $RETCODE
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#
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# Version 4.12
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# - Fixed various logic errors and typos -- Daniel Lewart
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#
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# Version 4.10
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# - Replace tabs with spaces
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# - More shllcheck cleanup work
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# - Remove unused DEBUG variable
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# - Fixed an innocuous whitespace bug in TLSFLAG variable creation
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# - Set the default TLS version to 1.1 (can be overridden with -v)
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# - Switched openssl CLI options to use an array. The reasons why
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# are documented here: http://mywiki.wooledge.org/BashFAQ/050
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#
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# Version 4.9
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# - Add a signal handler to call the cleanup funtion
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# if the script doesn't exit() cleanly -- Timothe Litt
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#
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# Version 4.8
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# - More mail client fixes
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#
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# Version 4.7
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# - Revert SENDER to ""
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# - More shellcheck cleanup
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#
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# Version 4.6
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# - Fixed programming logic error
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#
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# Version 4.5
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# - Re-work mailx support for FreeBSD
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# - More shellcheck fixes
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#
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# Version 4.4
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# - Use command -v instead of which utility to satisfy shellcheck.
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# - Fix unquoted MAIL and MAILMODE variables in help output
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# - More shellcheck fixes
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#
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# Version 4.3
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# - Fixed a typo in the program version
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#
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# Version 4.2
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# - Change CERTDAYS to CERTDIFF in the e-mail subject.
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#
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# Version 4.1
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# - Fix usage output
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#
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# Version 4.0
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# - Updated the script syntax to align with UNIX shell programming
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# - Check for DNS resolution failures
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# - First round of updates to make shellcheck happy
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# - Rework the logic to call mailx.
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# - Print the version with the "-V" option.
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# - Define the version in the PROGRAMVERSION variable
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#
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# Version 3.31
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# - Fixed the test for the -servername flag -- Kitson Consulting.
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#
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# Version 3.30
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# - Use highest returncode for Nagios output -- Marcel Pennewiss
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# - Set RETCODE to 3 (unknown) if a certificate file does not exist -- Marcel Pennewiss
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# - Add a "-d" option to specify a directory or file mask pattern -- Marcel Pennewiss
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# - Add a "-N" option to create summarized Nagios output -- Marcel Pennewiss
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# - Cleaned up many formatting -- Marcel Pennewiss
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#
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# Versione 3.29a
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# - Added option to specify email sender address
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#
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# Version 3.29
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# - Add the openssl -servername flag if it shows up in help.
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#
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# Version 3.28
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# - Added a DEBUG option to assist with debugging folks who use the script
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#
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# Version 3.27
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# - Allow white spaces to exist in the certificate file list
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# - Add an additional check to pick up bad / non-existent certificates
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# - Add a check to look for the existence of a mail program. Error out if it's not present.
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# - Enable the TLS -servername extension by default - Juergen Knaack & Johan Denoyer
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#
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# Version 3.26
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# - Allow the certificate type (PEM, DER, NET) to be passed on the command line
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#
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# Version 3.25
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# - Check for "no route to host" errors -- Dan Doyle
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# - Set RETCODE to 3 (unknown) if a connection error occurs -- Dan Doyle
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# - Documentation fixes
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#
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# Version 3.24
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# - Utilize the -clcerts option to limit the results to client certificates - Eitan Katznelson
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#
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# Version 3.23
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# - Fixed typo in date2julian routine -- Ken Cook
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#
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# Version 3.22
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# - Change the validation option to "-V"
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# - Add a "-v" option to specify a specific protocol version (ssl2, ssl3 or tls)
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#
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# Version 3.21
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# - Adjust e-mail checking to avoid exiting if notifications aren't enabled -- Nick Anderson
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# - Added the number of days until expiration to the Nagios output -- Nick Anderson
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#
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# Version 3.20
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# - Fixed a bug in certificate length checking -- Tim Nowaczyk
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#
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# Version 3.19
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# - Added check to verify the certificate retrieved is valid
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#
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# Version 3.18
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# - Add support for connecting to FTP servers -- Paul A Sand
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#
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# Version 3.17
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# - Add support for connecting to imap servers -- Joerg Pareigis
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#
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# Version 3.16
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# - Add support for connecting to the mail sbmission port -- Luis E. Munoz
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#
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# Version 3.15
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# - Adjusted the file checking logic to use the correct certificate -- Maciej Szudejko
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# - Add sbin to the default search paths for OpenBSD compatibility -- Alex Popov
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# - Use cut instead of substring processing to ensure compatibility -- Alex Popov
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#
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# Version 3.14
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# - Fixed the Common Name parser to handle DN's where the CN is not the last item
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# eg. EmailAddr -- Jason Brothers
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# - Added the ability to grab the serial number -- Jason Brothers
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# - Added the "-b" option to print results without a header -- Jason Brothers
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# - Added the "-v" option for certificate validation -- Jason Brothers
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#
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# Version 3.13
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# - Updated the subject line to include the hostname as well as
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# the common name embedded in the X509 certificate (if it's
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# available) -- idea proposed by Mike Burns
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#
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# Version 3.12
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# - Updated the license to allow redistribution and modification
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#
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# Version 3.11
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# - Added ability to comment out lines in files passed
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# to the "-f" option -- Brett Stauner
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# - Fixed comment next to file processing logic
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#
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# Version 3.10
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# - Fixed POP3 port -- Simon Matter
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#
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# Version 3.9
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# - Switched binary location logic to use which utility
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#
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# Version 3.8
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# - Fixed display on 80 column displays
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# - Cleaned up the formatting
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#
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# Version 3.7
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# - Fixed bug in NAGIOS tests -- Ben Allen
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#
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# Version 3.6
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# - Added support for certificates stored in PKCS#12 databases -- Ken Gallo
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# - Cleaned up comments
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# - Adjusted variables to be more consistent
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#
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# Version 3.5
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# - Added support for NAGIOS -- Quanah Gibson-Mount
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# - Added additional checks for mail -- Quanah Gibson-Mount
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# - Convert tabs to spaces -- Quanah Gibson-Mount
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# - Cleaned up usage() routine
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# - Added additional checks for openssl
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#
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# Version 3.4
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# - Added a missing "{" to line 364 -- Ken Gallo
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# - Move mktemp to the start of the main body to avoid errors
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# - Adjusted default binary paths to make sure the script just works
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# w/ Solaris, BSD and Linux hosts
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#
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# Version 3.3
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# - Added common name from X.509 certificate file to E-mail body / header -- Doug Curtis
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# - Fixed several documentation errors
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# - Use mktemp to create temporary files
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# - Convert printf, sed and awk to variables
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# - Check for printf, sed, awk and mktemp binaries
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# - Add additional logic to make sure mktemp returned a valid temporary file
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#
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# Version 3.2
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# - Added option to list certificates in the file passed to "-f".
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#
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# Version 3.1
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# - Added handling for starttls for smtp -- Marco Amrein
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# - Added handling for starttls for pop3 (without s) -- Marco Amrein
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# - Removed extra spacing at end of script
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#
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# Version 3.0
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# - Added "-i" option to print certificate issuer
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# - Removed $0 from Subject line of outbound e-mails
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# - Fixed some typographical errors
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# - Removed redundant "-b" option
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#
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# Version 2.0
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# - Fixed an issue with e-mails formatting incorrectly
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# - Added additional space to host column -- Darren-Perot Spruell
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# - Replaced GNU date dependency with CHRIS F. A. JOHNSON's
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# date2julian shell function. This routine can be found on
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# page 170 of Chris's book "Shell Scripting Recipes: A
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# Problem-Solution Approach," ISBN #1590594711. Julian function
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# was created based on a post to comp.unix.shell by Tapani Tarvainen.
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# - Cleaned up function descriptions
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# - Removed several lines of redundant code
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# - Adjusted the help message
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#
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# Version 1.1
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# - Added "-c" flag to report expiration status of a PEM encoded
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# certificate -- Hampus Lundqvist
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# - Updated the prints messages to display the reason a connection
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# failed (connection refused, connection timeout, bad cert, etc)
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# - Updated the GNU date checking routines
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# - Added checks for each binary required
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# - Added checks for connection timeouts
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# - Added checks for GNU date
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# - Added a "-h" option
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# - Cleaned up the documentation
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#
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# Version 1.0
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# Initial Release
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#
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# Purpose:
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# ssl-cert-check checks to see if a digital certificate in X.509 format
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# has expired. ssl-cert-check can be run in interactive and batch mode,
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# and provides facilities to alarm if a certificate is about to expire.
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#
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# License:
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# Requirements:
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# Requires openssl
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#
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# Installation:
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# Copy the shell script to a suitable location
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#
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# Tested platforms:
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# -- Solaris 9 using /bin/bash
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# -- Solaris 10 using /bin/bash
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# -- OS X 10.4.2 using /bin/bash
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# -- OpenBSD using /bin/sh
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# -- FreeBSD using /bin/sh
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# -- Centos Linux 3, 4, 5 & 6 using /bin/bash
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# -- Redhat Enterprise Linux 3, 4, 5 & 6 using /bin/bash
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# -- Gentoo using /bin/bash
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#
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# Usage:
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# Refer to the usage() sub-routine, or invoke ssl-cert-check
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# with the "-h" option.
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#
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# Examples:
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# Please refer to the following site for documentation and examples:
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# http://prefetch.net/articles/checkcertificate.html
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# Cleanup temp files if they exist
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trap cleanup EXIT INT TERM QUIT
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PATH=/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/ssl/bin:/usr/sfw/bin
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export PATH
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# Who to page when an expired certificate is detected (cmdline: -e)
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ADMIN="root"
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# Email sender address for alarm notifications
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SENDER=""
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# Number of days in the warning threshhold (cmdline: -x)
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WARNDAYS=30
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# If QUIET is set to TRUE, don't print anything on the console (cmdline: -q)
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QUIET="FALSE"
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# Don't send E-mail by default (cmdline: -a)
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ALARM="FALSE"
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# Don't run as a Nagios plugin by default (cmdline: -n)
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NAGIOS="FALSE"
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# Don't summarize Nagios output by default (cmdline: -N)
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NAGIOSSUMMARY="FALSE"
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# NULL out the PKCSDBPASSWD variable for later use (cmdline: -k)
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PKCSDBPASSWD=""
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# Type of certificate (PEM, DER, NET) (cmdline: -t)
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CERTTYPE="pem"
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# Location of system binaries
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AWK=$(command -v awk)
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DATE=$(command -v date)
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GREP=$(command -v grep)
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OPENSSL=$(command -v openssl)
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PRINTF=$(command -v printf)
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SED=$(command -v sed)
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MKTEMP=$(command -v mktemp)
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FIND=$(command -v find)
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# Try to find a mail client
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if [ -f /usr/bin/mailx ]; then
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MAIL="/usr/bin/mailx"
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MAILMODE="mailx"
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elif [ -f /bin/mail ]; then
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MAIL="/bin/mail"
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MAILMODE="mail"
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elif [ -f /usr/bin/mail ]; then
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MAIL="/usr/bin/mail"
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MAILMODE="mail"
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elif [ -f /sbin/mail ]; then
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MAIL="/sbin/mail"
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MAILMODE="mail"
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elif [ -f /usr/sbin/mail ]; then
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MAIL="/usr/sbin/mail"
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MAILMODE="mail"
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elif [ -f /usr/sbin/sendmail ]; then
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MAIL="/usr/sbin/sendmail"
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MAILMODE="sendmail"
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else
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MAIL="cantfindit"
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MAILMODE="cantfindit"
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fi
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# Return code used by nagios. Initialize to 0.
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RETCODE=0
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# Certificate counters and minimum difference. Initialize to 0.
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SUMMARY_VALID=0
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SUMMARY_WILL_EXPIRE=0
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SUMMARY_EXPIRED=0
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SUMMARY_MIN_DIFF=0
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SUMMARY_MIN_DATE=
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SUMMARY_MIN_HOST=
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SUMMARY_MIN_PORT=
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# Set the default umask to be somewhat restrictive
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umask 077
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#####################################################
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# Purpose: Remove temporary files if the script doesn't
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||
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# exit() cleanly
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#####################################################
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|
|
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
|