SSL certs

show_certs.md

With SNI:

$ openssl s_client -showcerts -servername www.example.com -connect www.example.com:443 </dev/null

No SNI:

$ openssl s_client -showcerts -connect www.example.com:443 </dev/null

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taken from: https://stackoverflow.com/questions/7885785/using-openssl-to-get-the-certificate-from-a-server

verify.md

openssl s_client -showcerts -verify 5 -connect gitlab.standardbank.co.za:443 < /dev/null

verify_certs.md

Verify a certificate against a CA file:

$ openssl verify -verbose -CAfile ca-certificates.crt example.crt

view_full_details.md

To view the full details of a site's cert:

$ echo | \
    openssl s_client -servername www.example.com -connect www.example.com:443 2>/dev/null | \
    openssl x509 -text