Asp Net Core HTTPS Certificate

Support Third-party Applications
2

For anyone having the same problem, I ended up succeeding with this script

#!/usr/bin/env bash

openssl genpkey -algorithm RSA -out localhost.key
openssl req -x509 -key localhost.key -out localhost.crt \
    -subj "/CN=localhost/O=localhost" \
    -config <(cat /etc/ssl/openssl.cnf - <<END
[ x509_ext ]
basicConstraints = critical,CA:true
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid:always,issuer
subjectAltName = DNS:localhost
END
    ) -extensions x509_ext

sudo trust anchor localhost.crt

Then I used this command to convert it to PFX for Kestrel:
openssl pkcs12 -export -out localhost.pfx -inkey localhost.key -in localhost.crt

Voilà! Just took me 3 hours and a lot of searching in old forums posts. Hopefully this is will be useful for someone else!