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Zabbix SSL Check

Scripts, Zabbix userparameters, and Zabbix templates for monitoring SSL certificate expiration from Zabbix.

The included python script uses openssl to discover SSL certificates on a host and add Zabbix items to monitor certificate expiry.

Templates were built against Zabbix 3.0.

Check types

Two Zabbix templates are included in templates/ for two different approaches: externalscripts or agent (Zabbix agent). Both cases expect Python and Zabbix sender to be installed.

externalscripts

Zabbix server or Zabbix proxy runs the checks via pollers.

Installation

  1. Install scripts/ssl_cert.py to the externalscripts directory

    $ cp scripts/ssl_cert.py /usr/lib/zabbix/externalscripts/

    ExternalScripts is a configuration option in zabbix_server.conf and zabbix_proxy.conf, so check there first to see where your directory is. On a default install on Ubuntu via repos.zabbix.com I found my zabbix_server.conf was configured to ExternalScripts=/usr/lib/zabbix/externalscripts.

  2. Import template templates/template_ssl_cert_externalscripts.xml in the Zabbix server UI.

    This will create Template SSL Cert - externalscripts in the Templates group of the Zabbix server.

  3. Create a hostname representing the host you want to monitor SSL certs for. For example github.com.

    By default the template passes the {HOST.NAME} macro into the script. This will be the target of the SSL certificate discovery and monitoring.

agent

Zabbix agent runs the checks.

NOTE: Zabbix agent can run checks against localhost and/or remote hosts

Installation

  1. Install scripts/ssl_cert.py to the /etc/zabbix/scripts/ directory on the host where the Zabbix agent is running.

  2. Install zabbix_agentd.d/userparameter_ssl_cert.conf to the userparameters directory on the host where the Zabbix agent is running.

    Default is /etc/zabbix/zabbix_agentd.d/.

  3. Restart zabbix-agent service to load the new UserParameter.

  4. Import template templates/template_ssl_cert_agent.xml in the Zabbix server UI.

    This will create Template SSL Cert - agent in the Templates group of the Zabbix server.

  5. Apply the template to monitor SSL certificates.

    The agent will run the script, but by default it will still target the {HOST.NAME} macro. If you wanted apply the template many hosts and have them monitor SSL certificates on localhost, the Run SSL certificate checks item in the template can be updated to look like this:

    ssl_cert.run_checks[localhost,443,10]

Limitations

  • In cases where one IP/server serves many hostnames (i.e. using nginx for SSL termination of multiple hostnames), only the default SSL Certificate will be returned. The script ssl_cert.py can target by servername if the Run SSL certificate checks in the externalscripts version is updated:

    ssl_cert.py["--port","443","--timeout","10","--servername","{HOST.NAME}"]

    This still requires individually adding each host in Zabbix, however.

Vagrant

A Vagrantfile has been included that will create a Zabbix 3.0 server VM and provide an example configuration of these monitoring templates.

  1. Install VirtualBox

  2. Install Vagrant

  3. Change directory to test/ and bring the Vagrant VM up

    $ cd test/
$ vagrant up

  4. Browse to http://localhost:8080/zabbix

    User: Admin
Pass: zabbix

    Two hosts will be created: github.com (example of externalscripts template) and google.com (example of agent template). SSL certificates will be discovered and added as items on these hosts.