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Humberto Rocha

Public Key

Setup ssh keys for remote access

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To easily setup your public keys into freshly created servers, specially when copy and paste is limited like in proxmox web console you can benefit for one of your accounts in a public or private git servers reachable by your server like Forgejo, Github, and Gitlab.

They all have the same API where you can fetch your public keys under the pattern:

https://<git-server>/<username>.keys

Try it in your browser to see the output.

Extract certificate from a domain

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To extract the certificate use:

openssl s_client -showcerts -servername humberto.io -connect humberto.io:443 </dev/null 2>/dev/null

If your target is not using SNI you don’t need to use the -servername <fqdn> option.

Then you can pipe it with other OpenSSL commands to extract information in the format that you need.

To extract PEM formatted cert:

| openssl x509 -outform PEM

To extract the public key:

| openssl x509 -pubkey -noout

To extract the Fingerprint: