Certificate configuration for dotnet Ubuntu 20.04 localhost https dev

localhost-ssl.conf

# Based on https://stackoverflow.com/a/59702094/419956 by user @chrisvdb cc-by-sa rev 2020.5.28.36925
# Not currently working for me on Ubuntu 20.04 though!

[req]
default_bits       = 2048
default_keyfile    = localhost.key
distinguished_name = req_distinguished_name
req_extensions     = req_ext
x509_extensions    = v3_ca

[req_distinguished_name]
commonName                  = localhost
commonName_default          = localhost
commonName_max              = 64

[req_ext]
subjectAltName = @alt_names

[v3_ca]
subjectAltName = @alt_names
basicConstraints = critical, CA:false
keyUsage = keyCertSign, cRLSign, digitalSignature, keyEncipherment

[alt_names]
DNS.1   = localhost
DNS.2   = 127.0.0.1