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Listar certificado y ver fecha y issuer

URL=google.com;PORT=443;OLDIFS=$IFS; IFS=':' certificates=$(echo | openssl s_client -showcerts -servername $URL -connect $URL:$PORT 2>/dev/null | sed -n '/-----BEGIN/,/-----END/ {/-----BEGIN/ s/^/:/; p}'); for certificate in ${certificates#:}; do echo;echo $certificate | openssl x509 -noout -subject -issuer -dates ;echo; done; IFS=$OLDIFS

El resultado es este, certificado, SUBCA y CA

subject=CN = *.google.com
issuer=C = US, O = Google Trust Services, CN = WR2
notBefore=Aug 12 06:33:49 2024 GMT
notAfter=Nov  4 06:33:48 2024 GMT


subject=C = US, O = Google Trust Services, CN = WR2
issuer=C = US, O = Google Trust Services LLC, CN = GTS Root R1
notBefore=Dec 13 09:00:00 2023 GMT
notAfter=Feb 20 14:00:00 2029 GMT


subject=C = US, O = Google Trust Services LLC, CN = GTS Root R1
issuer=C = BE, O = GlobalSign nv-sa, OU = Root CA, CN = GlobalSign Root CA
notBefore=Jun 19 00:00:42 2020 GMT
notAfter=Jan 28 00:00:42 2028 GMT

Firefox

Para importar un certificado en firefox:

https://bugs.launchpad.net/ubuntu/+source/firefox-3.0/+bug/198841

Crear o generar Certificado autofirmado Creamos Petición:

openssl req -new -nodes -keyout www.lobo99.com.key -out www.lobo99.com.csr -subj "/C=ES/ST=Catalonia/L=Mataro/O=lobo99/CN=www.lobo99.com"

Firmamos el certificado:

openssl x509 -req -days 3650 -in www.lobo99.com.csr -signkey www.lobo99.com.key -out www.lobo99.com.crt