How to save a remote server SSL certificate locally as a file - Super User

How to save a remote server SSL certificate locally as a file - Super User

up vote 8 down vote

This is gbroiles' answer, but I wanted to point out that the cURL project has a page with a few more details on using openssl to save the remote server's SSL certificate:

• openssl s_client -connect {HOSTNAME}:{PORT} | tee logfile

• Type QUIT and press the Enter / Return key.
• The certificate will be listed between "BEGIN CERTIFICATE" and "END CERTIFICATE" markers.

• If you want to see the data in the certificate, you can use:

  openssl x509 -inform PEM -in certfile -text -out certdata

  where certfile is the certificate extracted from logfile. Look in certdata.

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