cfssl

Cloudflare’s PKI and TLS toolkit. See also: openssl. More information: https://github.com/cloudflare/cfssl.

• Show certificate information of a host:

cfssl certinfo -domain www.google.com

• Decode certificate information from a file:

cfssl certinfo -cert path/to/certificate.pem

• Scan host(s) for SSL/TLS issues:

cfssl scan host1 host2 ...

• Display help for a subcommand:

cfssl genkey|gencsr|certinfo|sign|gencrl|ocspdump|ocsprefresh|ocspsign|ocspserve|scan|bundle|crl|print-defaults|revoke|gencert|serve|version|selfsign|info -h