Check the certificate validity period left in all your domains. Mainly used for checking if auto-renewal of LetsEncrypt certs are proceeding as expected.
Simply give this script etiher a domain:
Input:
./certdates https://freebsd.org
Output:
https://freebsd.org:443 ⟶ January 21, 2020
days left: 58
or a text file of domains such as this:
https://freebsd.org
https://openbsd.org
Input:
./certdates --domains="domains.txt" --threshold=60
Output:
and give it a threshold of the number of days of validity. For example if you are interested in highlighting cases where there is less than 60 days of certificate validity.
You can compile this to a binary with:
go build certdates.go
should make a binary in the same directory:
./certdates