This is a text-only version of the following page on https://raymii.org:
---
Title : Nagios plugin to check an OCSP server
Author : Remy van Elst
Date : 06-05-2013
URL : https://raymii.org/s/software/Nagios_plugin_to_check_OCSP.html
Format : Markdown/HTML
---
This is a nagios plugin to check an OCSP server. It does so by having either a
PEM encoded certificate in the code, and the PEM encoded certificate of the
issuer in the code, or by using two given PEM files. This is sent to the OCSP
server and the response is then parsed to give the correct nagios result. It is
targeted at administrators who have their own OCSP and need to know when it is
not working.
This version has contributions from [Pali Sigurdsson][1].
<p class="ad"> <b>Recently I removed all Google Ads from this site due to their invasive tracking, as well as Google Analytics. Please, if you found this content useful, consider a small donation using any of the options below:</b><br><br> <a href="https://leafnode.nl">I'm developing an open source monitoring app called Leaf Node Monitoring, for windows, linux & android. Go check it out!</a><br><br> <a href="https://github.com/sponsors/RaymiiOrg/">Consider sponsoring me on Github. It means the world to me if you show your appreciation and you'll help pay the server costs.</a><br><br> <a href="https://www.digitalocean.com/?refcode=7435ae6b8212">You can also sponsor me by getting a Digital Ocean VPS. With this referral link you'll get $100 credit for 60 days. </a><br><br> </p>
#### Download
[Download the plugin from my github][3]
[Download the plugin from raymii.org][4]
#### Usage
`./check_ocsp.sh`:
* `-H host_name` \- remote host to check
* `-P port` \- port to use
* `--noverify` \- Don't verify if certificate is valid
* `--max-age 4800` \- alert if certificate is about to expire
* `--cert filename` \- use this cert file instead of the hardcoded one
* `--issuer filename.pem` \- use this issuer certificate instead of the hardcoded one
* `--verbose` \- handy for troubleshooting, echos the exact openssl command used
#### Installation
This guide covers the steps needed for Ubuntu 10.04/12.04 and Debian 6. It
should also work on other distro's, but make sure to modify the commands where
needed (package installation for example).
First make sure you have the required tools:
apt-get install gawk grep bash sed wget curl openssl
Place the script on the nagios host (I've placed it in _/etc/nagios/plugins/_ ):
wget -O */etc/nagios/plugins/check_ocsp_hard.sh http://raymii.org/s/inc/downloads/check_ocsp_hard.sh
Make sure that the script is executable:
chmod +x /etc/nagios/plugins/check_ocsp_hard.sh
Now test it:
/etc/nagios/plugins/check_ocsp_hard.sh
OK: OCSP up and running - status of certificate for raymii.org GOOD by OCSP: http://ocsp.comodoca.com/
#### Nagios config
Here's some example nagios config:
Lets create a command definition:
define command{
command_name check_ocsp
command_line /etc/nagios-plugins/check_ocsp.sh -H $USER1$ -p $USER2$ --cert $USER3$ --issuer $USER4$
}
And a service check:
define service {
use generic-service
host_name localhost
service_description OCSP check of $OCSP for $DOMAIN
contact nagiosadmin
check_command check_ocsp!raymii.org!443!/etc/ssl/certs/raymiiorg.pem!/etc/ssl/certs/comodo.pem
}
Or if you use a hardcoded certificate:
define command{
command_name check_ocsp_hard
command_line /etc/nagios-plugins/check_ocsp.sh
}
define service {
use generic-service
host_name localhost
service_description OCSP check of $OCSP for $DOMAIN with hardcoded certificate
contact nagiosadmin
check_command check_ocsp_hard
}
[1]: https://github.com/palli/
[2]: https://www.digitalocean.com/?refcode=7435ae6b8212
[3]: https://github.com/RaymiiOrg/nagios
[4]: https://raymii.org/s/inc/downloads/check_ocsp.sh
---
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