SAN = "email:copy"
KU = "nonRepudiation, digitalSignature, keyEncipherment"
ICA = "IntermediateCA"

[ ca ]
# `man ca`
default_ca = CA_default

[ CA_default ]
# Directory and file locations.
dir               = /etc/ssl/certs
certs             = $dir
crl_dir           = /tmp
new_certs_dir     = $dir
database          = /tmp/index.txt
serial            = /tmp/serial
RANDFILE          = /tmp/rand

# The intermediate key and intermediate certificate.
private_key       = $dir/${ENV::ICA}.key
certificate       = $dir/${ENV::ICA}.crt

# For certificate revocation lists.
crlnumber         = /tmp/crlnumber
crl               = /tmp/${ENV::ICA}.crl
crl_extensions    = crl_ext
default_crl_days  = 30

# SHA-1 is deprecated, so use SHA-2 instead.
default_md        = sha256

name_opt          = ca_default
cert_opt          = ca_default
default_days      = 375
preserve          = no
policy            = policy_loose

[ policy_loose ]
# Allow the intermediate CA to sign a more diverse range of certificates.
# See the POLICY FORMAT section of the `ca` man page.
countryName             = optional
stateOrProvinceName     = optional
localityName            = optional
organizationName        = optional
organizationalUnitName  = optional
commonName              = supplied
emailAddress            = optional

[ req ]
# Options for the `req` tool (`man req`).
default_bits        = 2048
distinguished_name  = req_distinguished_name
string_mask         = utf8only

# SHA-1 is deprecated, so use SHA-2 instead.
default_md          = sha256

# Extension to add when the -x509 option is used.
x509_extensions     = v3_ca

[ req_distinguished_name ]
# See <https://en.wikipedia.org/wiki/Certificate_signing_request>.
countryName                     = Country Name (2 letter code)
stateOrProvinceName             = State or Province Name
localityName                    = Locality Name
0.organizationName              = Organization Name
organizationalUnitName          = Organizational Unit Name
commonName                      = Common Name
emailAddress                    = Email Address

[ v3_ca ]
# Extensions for a typical CA (`man x509v3_config`).
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid:always,issuer
basicConstraints = critical, CA:true
keyUsage = critical, digitalSignature, cRLSign, keyCertSign

[ v3_intermediate_ca ]
# Extensions for a typical intermediate CA (`man x509v3_config`).
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid:always,issuer
basicConstraints = critical, CA:true, pathlen:0
keyUsage = critical, digitalSignature, cRLSign, keyCertSign

[ crl_ext ]
# Extension for CRLs (`man x509v3_config`).
authorityKeyIdentifier=keyid:always

[smime]
# Extension for S/MIME certificates (`man smime`).
basicConstraints = CA:FALSE
keyUsage = ${ENV::KU}
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid,issuer
subjectAltName = ${ENV::SAN}
extendedKeyUsage = emailProtection