OpenSSL -- eMail CA Configuration File

Create the file using vi text editor. Here are the basics needed for this exercise (edit as needed):
/usr/local/etc/PKI/etc/email-ca.conf

# RZ-Amper Email CA

[ default ]
ca                      = email-ca                                 # CA name
dir                     = .                                        # Top dir
base_url                = http://www.rz-amper.de/trust-center      # CA base URL
aia_url                 = $base_url/index.php?stage=dl_emailcer    # CA certificate URL
crl_url                 = $base_url/index.php?stage=dl_emailcrl    # CRL distribution point
name_opt                = multiline,-esc_msb,utf8                  # Display UTF-8 characters

# CA certificate request
[ req ]
default_bits            = 8192                                 # RSA key size
encrypt_key             = yes                                  # Protect private key
default_md              = sha256                               # MD to use
utf8                    = yes                                  # Input is UTF-8
string_mask             = utf8only                             # Emit UTF-8 strings
prompt                  = no                                   # Don't prompt for DN
distinguished_name      = ca_dn                                # DN section
req_extensions          = ca_reqext                            # Desired extensions

[ ca_dn ]
countryName             = "DE"
organizationName        = "Rechenzentrum Amper"
organizationalUnitName  = "EDV-Programm Entwicklungs Abteilung"
commonName              = "Rechenzentrum Amper eMail Certificate Authority"

[ ca_reqext ]
keyUsage                = critical,keyCertSign,cRLSign
basicConstraints        = critical,CA:true,pathlen:0
subjectKeyIdentifier    = hash

# CA operational settings
[ ca ]
default_ca              = email_ca                              # The default CA section

[ email_ca ]
certificate             = $dir/ca/$ca.crt                      # The CA cert
private_key             = $dir/ca/$ca/private/$ca.key          # CA private key
new_certs_dir           = $dir/ca/$ca                          # Certificate archive
serial                  = $dir/ca/$ca/db/$ca.crt.srl           # Serial number file
crlnumber               = $dir/ca/$ca/db/$ca.crl.srl           # CRL number file
database                = $dir/ca/$ca/db/$ca.db                # Index file
unique_subject          = no                                   # Require unique subject
default_days            = 3652                                 # How long to certify for
default_md              = sha256                               # MD to use
policy                  = match_pol                            # Default naming policy
email_in_dn             = no                                   # Add email to cert DN
preserve                = no                                   # Keep passed DN ordering
name_opt                = $name_opt                            # Subject DN display options
cert_opt                = ca_default                           # Certificate display options
copy_extensions         = copy                                 # Copy extensions from CSR
x509_extensions         = email_ext                            # Default cert extensions
default_crl_days        = 1                                    # How long before next CRL
crl_extensions          = crl_ext                              # CRL extensions

[ match_pol ]
countryName             = optional                             # May match 'DE'
stateOrProvinceName     = optional                             # Included if present
localityName            = optional                             # Included if present
organizationName        = optional                             # May match 'Rechenzentrum Amper'
organizationalUnitName  = optional                             # Included if present
commonName              = supplied                             # Must be present

[ any_pol ]
domainComponent         = optional
countryName             = optional
stateOrProvinceName     = optional
localityName            = optional
organizationName        = optional
organizationalUnitName  = optional
commonName              = optional
emailAddress            = optional

# Extensions
[ email_ext ]
keyUsage                = critical,digitalSignature,keyEncipherment
basicConstraints        = CA:false
extendedKeyUsage        = emailProtection,clientAuth,anyExtendedKeyUsage
subjectKeyIdentifier    = hash
authorityKeyIdentifier  = keyid:always
authorityInfoAccess     = @issuer_info
crlDistributionPoints   = @crl_info

[ crl_ext ]
authorityKeyIdentifier  = keyid:always
authorityInfoAccess     = @issuer_info

[ issuer_info ]
caIssuers;URI.0         = $aia_url

[ crl_info ]
URI.0                   = $crl_url