So I have been able to create a Certificate Signing Request with a Subject Alternative Name of the form
subjectAltName=IP:188.8.131.52 by following the recipe in a previous (splendid) answer.
When I inspect that CSR with
openssl req -in key.csr -text I can see a corresponding section:
Requested Extensions: X509v3 Subject Alternative Name: IP Address:184.108.40.206
I then proceed to signing the CSR with a self-signed key like so:
openssl x509 -req -days 365 -CA ca.crt -CAkey ca.key -CAcreateserial \ -in key.csr -out key.crt
The resulting certificate (when inspected with
openssl x509 -in key.crt -text) does not identify that section any more.
Is this just an artifact of display parameters or need I also instruct
openssl x509 that it should include the extension when doing its signing (and if so, how)?
I am using OpenSSL on macOS High Sierra (
openssl version reports
LibreSSL 2.2.7) and have not changed its configuration from the defaults. The keys will ultimately be used between Debian (Stretch) servers, so I could perform key generation there, if it helps in this context.