self_signed_certs.sh

fqdn="test.dillonhafer.com"

# Ubuntu
# config_file="/usr/lib/ssl/openssl.cnf"

# macOS
# config_file="/System/Library/OpenSSL/openssl.cnf"

openssl req \
  -newkey rsa:2048 \
  -x509 \
  -nodes \
  -keyout $fqdn.key \
  -new \
  -out $fqdn.crt \
  -subj /CN=$fqdn \
  -reqexts SAN \
  -extensions SAN \
  -config <(cat $config_file \
  <(printf '[SAN]\nsubjectAltName=DNS:%s' $fqdn)) \
  -sha256 \
  -days 3650