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[OPENSSL 101] OPENSSL 101 #openssl #ssl #101 #validity #check
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openssl-101.md

OPENSSL 101

  • Convert DER to CRT openssl x509 -inform DER -in certificate.cer > certificate.crt

  • Retrieve CA Certificate openssl x509 -text -noout -in mycertificatefile.crt

  • Check validity of remote certificate

DOM="xxx.xxxxxxx.xxx";PORT="443";printf Q | openssl s_client -servername $DOM -connect $DOM:$PORT | openssl x509 -noout -dates
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