Create a {% highlight sh %} [ ca ]

man ca

default_ca = CA_default

[ CA_default ]

Directory and file locations.

dir = ./ certs = $dir/certs crl_dir = $dir/crl new_certs_dir = $dir/newcerts database = $dir/index.txt serial = $dir/serial RANDFILE = $dir/private/.rand

The root key and root certificate.

private_key = $dir/private/ca.key.pem certificate = $dir/certs/ca.cert.pem

For certificate revocation lists.

crlnumber = $dir/crlnumber crl = $dir/crl/ca.crl.pem 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_strict

[ policy_strict ]

The root CA should only sign intermediate certificates that match.

See the POLICY FORMAT section of man ca.

countryName = match stateOrProvinceName = match organizationName = match organizationalUnitName = optional commonName = supplied emailAddress = optional

[ 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 = IN stateOrProvinceName = Maharashtra localityName = Mumbai 0.organizationName = Anushakti Nagar organizationalUnitName = Nilgiri commonName = Common Name emailAddress = abhisheietk@gmail.com

Optionally, specify some defaults.

countryName_default = IN stateOrProvinceName_default = Maharashtra localityName_default = 0.organizationName_default = Anushakti Nagar

organizationalUnitName_default =

emailAddress_default =

[ 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

[ usr_cert ]

Extensions for client certificates (man x509v3_config).

basicConstraints = CA:FALSE nsCertType = client, email nsComment = “OpenSSL Generated Client Certificate” subjectKeyIdentifier = hash authorityKeyIdentifier = keyid,issuer keyUsage = critical, nonRepudiation, digitalSignature, keyEncipherment extendedKeyUsage = clientAuth, emailProtection

[ server_cert ]

Extensions for server certificates (man x509v3_config).

basicConstraints = CA:FALSE nsCertType = server nsComment = “OpenSSL Generated Server Certificate” subjectKeyIdentifier = hash authorityKeyIdentifier = keyid,issuer:always keyUsage = critical, digitalSignature, keyEncipherment extendedKeyUsage = serverAuth

[ crl_ext ]

Extension for CRLs (man x509v3_config).

authorityKeyIdentifier=keyid:always

[ ocsp ]

Extension for OCSP signing certificates (man ocsp).

basicConstraints = CA:FALSE subjectKeyIdentifier = hash authorityKeyIdentifier = keyid,issuer keyUsage = critical, digitalSignature extendedKeyUsage = critical, OCSPSigning

{% highlight sh %}

!/usr/bin/bash

CADIR=${1} for i in certs private newcerts do mkdir -p ${CADIR}/${i} done cp ca.cnf ${CADIR}/openssl.cnf openssl genrsa -aes256 -out private/ca.key.pem 4096 openssl req -config openssl.cnf -key private/ca.key.pem -new -x509 -days 7300 -sha256 -extensions v3_ca -out certs/ca.cert.pem