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SSL Certificate expiry collection

Splunk Cloud
Overview
Details
Collect SSL certificates detail on expiry dates and issuer so your IT support teams can be alerted and ahead of the game with renewals.

Certificates Expiry Add-on for Splunk

  • Author: Gary Croker

Description

This Certificates Expiry Add-on for Splunk allows a Splunk® Enterprise
or Splunk Cloud administrator to collect data from hostnames or FQDN. The add-on
collects the certificate but records minimal detail from the certificate.
The Add-on is built with Splunk AOB (Add-on Builder) and minimalist viewpoint.
Aim is just enough field data to raise alerts to appropriate teams or administrators that
a certificate is approaching expiration and requires renewal. Use it to monitor certificates
for splunk forwarders and indexers for eg. indexer01:9996

The fields collected by the add-on are:

  • date - date and time the input runs
  • fqdn - the hostname or FQDN hosting the certificate
  • port - the port of the hostname or FQDN hosting the certificate
  • expiredays - the calculated days until the certificate expires
  • issuer - the organizationName in issuer
  • commonName - the commonName in issuer
  • use_proxy - if proxy was used
  • notAfter - date in notAfter from certificate
  • notBefore - date in netBefore from certificate

example event
date=01/06/2022 11:42:45 fqdn=splunk.com port=443 expiredays=181 issuer="DigiCert Inc" commonName="DigiCert TLS RSA SHA256 2020 CA1" use_proxy=True notAfter="Nov 29 23:59:59 2022 GMT" notBefore="Nov 29 00:00:00 2021 GMT"

Documentation

No components are required on Searchhead or Searchhead Clusters
Install this TA on a HF (Heavy Forwarder) and configure inputs using a proxy or not

Proxy:
The proxy implementation is limited at this time, http transparent proxy only. No authentication to the proxy is performed in this version.

Debug log level:
Can be used if set

Interval:
defaults to 12h or 43200 seconds which is probably enough data for raising alerts

Internal Index info:
use the internal index for information on inputs

Internal Index

index=_internal  sourcetype="tacertificatesexpiry:log"

Example Search

sourcetype=ssl_cert | stats last(issuer) as Issuer last(commonName) as commonName last(expiredays) as "Days Left" by fqdn | rename fqdn as "Domain / Hostname"

Example Alert search

sourcetype=ssl_cert | stats last(issuer) as Issuer last(commonName) as commonName last(expiredays) as "Days Left"  by fqdn | rename fqdn as "Domain / Hostname" | where tonumber('Days Left') < 30

Libraries Included

none

Release Notes

Version 0.0.2
June 15, 2022

This Certificates Expiry Add-on for Splunk allows a Splunk® Enterprise
or Splunk Cloud administrator to collect data from hostnames or FQDN. The add-on
collects the certificate but records minimal detail from the certificate.
The Add-on is built with Splunk AOB (Add-on Builder) and minimalist viewpoint.
Aim is just enough field data to raise alerts to appropriate teams or administrators that
a certificate is approaching expiration and requires renewal. Use it to monitor certificates
for splunk forwarders and indexers for eg. indexer01:9996


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