req_extensions = req_ext [req_ext] extendedKeyUsage = serverAuth subjectAltName = @alt_names [alt_names] email = mail@example.com DNS = example.com dirName = dirname_sect IP = 127.0.0.1 URI = http://pki.example.com [dirname_sect] C=UK O=Mbed TLS CN=Mbed TLS directoryName SAN