linux verify dates of SSL certificates

[mister_v]

Hi, does anyone knows the linux command to show the expire date of an SSL certificate ?

[chris]

You can use the following command :

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echo | openssl s_client -servername SERVERNAME -connect SERVER:PORT 2>/dev/null | openssl x509 -noout -dates

An example:

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echo | openssl s_client -servername www.webmaster2020.com -connect www.webmaster2020.com:443 2>/dev/null | openssl x509 -noout -dates
notBefore=Jun 24 00:00:00 2020 GMT
notAfter=Aug  1 23:59:59 2022 GMT

[chris]

If you havce access to the file directly:

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less certificate.crt | openssl x509 -noout -dates