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Having TLS certificate in local file, I can display its details using syntax like:

openssl x509 -text -noout -in cert_filename

Is there any way to display remote SMTP/POP3/HTTP server's TLS certificate in this same format in bash terminal?

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1 Answer 1

up vote 4 down vote accepted

openssl s_client -connect server:port display some informations. Maybe is it sufficient for you. It is not exactly the same format, but it can help.

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You can also add -starttls PROTO if the protocol is not native SSL/TLS. For example, -starttls pop3. –  Michael Kjörling Aug 8 at 19:48

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