Config file can be used to statically define some of the OpenSSL settings.
Example:
```
[ req ]
distinguished_name = req_dn
req_extensions = req_ext
prompt = no
[ req_dn ]
CN = *.example.com
[ req_ext ]
subjectAltName = @alt_names
[ alt_names ]
DNS.1 = server.example.com
DNS.2 = www.example.com
```
### See also
1.
### Reference
1. [OpenSSL x509v3 page](https://www.openssl.org/docs/man1.1.1/man5/x509v3_config.html)