TLS certificate generation scripts

cert.sh

#!/usr/bin/env bash

# based on https://jamielinux.com/docs/openssl-certificate-authority/index.html
# TODO: check if root

set -e

ROOT_STORE=/etc/ssl/caroperator-svc/root
ROOT_KEY=$ROOT_STORE/private/ca.key
ROOT_CERT=$ROOT_STORE/certs/ca.cert

IMDT_STORE=/etc/ssl/caroperator-svc/intermediate
IMDT_KEY=$IMDT_STORE/private/intermediate.key
IMDT_CERT=$IMDT_STORE/certs/intermediate.cert
IMDT_CSR=$ROOT_STORE/csr/intermedite.csr
CA_CHAIN=$IMDT_STORE/certs/ca-chain.cert

case $1 in
    init-ca)
        echo === Prepare the root directory
        mkdir -p $ROOT_STORE/{certs,crl,csr,newcerts,private}
        chmod 700 $ROOT_STORE/private
        touch $ROOT_STORE/index.txt
        echo 1000 > $ROOT_STORE/serial

        echo === Create the root key
        openssl genrsa -out $ROOT_KEY 4096
        chmod 400 $ROOT_KEY

        echo === Create the root certificate
        openssl req -config conf/openssl-root.conf \
          -new -x509 -days 7300 -extensions v3_ca \
          -key $ROOT_KEY \
          -out $ROOT_CERT
        chmod 444 $ROOT_CERT

        echo === Verify the root certificate
        openssl x509 -noout -text -in $ROOT_CERT


        echo === Prepare the intermediate directory
        mkdir -p $IMDT_STORE/{certs,crl,csr,newcerts,private}
        chmod 700 $IMDT_STORE/private
        touch $IMDT_STORE/index.txt
        echo 1000 > $IMDT_STORE/serial
        echo 1000 > $IMDT_STORE/crlnumber

        echo === Create the intermediate key
        openssl genrsa -out $IMDT_KEY 4096
        chmod 400 $IMDT_KEY

        echo === Create the intermediate certificate
        openssl req -config conf/openssl-intermediate.conf \
          -new \
          -key $IMDT_KEY \
          -out $IMDT_CSR

        openssl ca -config conf/openssl-root.conf \
          -extensions v3_intermediate_ca \
          -days 3650 -notext -md sha256 \
          -in $IMDT_CSR \
          -out $IMDT_CERT
        chmod 444 $IMDT_CERT

        echo === Verify the intermediate certificate
        openssl verify -CAfile $ROOT_CERT $IMDT_CERT

        echo === Create the certificate chain file
        cat $IMDT_CERT $ROOT_CERT > $CA_CHAIN
        chmod 444 $CA_CHAIN
        ;;
    gen-csr)
        CLIENT_NAME=$2
        KEY=$IMDT_STORE/private/$CLIENT_NAME.key
        CSR=$IMDT_STORE/csr/$CLIENT_NAME.csr

        openssl genrsa -out $KEY 2048
        chmod 400 $KEY
        openssl req -config conf/openssl-intermediate.conf \
          -key $KEY \
          -new -sha256 -out $CSR
        ;;
    sign-user-cert)
        CLIENT_NAME=$2
        CSR=$IMDT_STORE/csr/$CLIENT_NAME.csr
        CERT=$IMDT_STORE/certs/$CLIENT_NAME.cert

        openssl ca -config conf/openssl-intermediate.conf \
          -extensions usr_cert -days 375 -notext -md sha256 \
          -in $CSR \
          -out $CERT
        chmod 444 $CERT
        ;;
    *)
        echo "Usage:"
        echo "    init-ca"
        echo "    gen-csr <client-name>"
        echo "    sign-user-cert <client-name>"
        exit 1
        ;;
esac

openssl-intermediate.conf

[ ca ]
default_ca = CA_default

[ CA_default ]
# Directory and file locations.
dir               = /etc/ssl/caroperator-svc/intermediate
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/intermediate.key
certificate       = $dir/certs/intermediate.cert

# For certificate revocation lists.
crlnumber         = $dir/crlnumber
crl               = $dir/crl/intermediate.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

countryName_default            = RU
stateOrProvinceName_default    = Russian Federation
localityName_default           =
0.organizationName_default     = RAMC
organizationalUnitName_default = RAMC/CaRMa Caroperator CA
commonName_default             = RAMC/CaRMa Caroperator Intermediate CA
emailAddress_default           = [email protected]


[ 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

openssl-root.conf

[ ca ]
default_ca = CA_default

[ CA_default ]
# Directory and file locations.
dir               = /etc/ssl/caroperator-svc/root
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
certificate       = $dir/certs/ca.cert

# For certificate revocation lists.
crlnumber         = $dir/crlnumber
crl               = $dir/crl/ca.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_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

[ 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

countryName_default            = RU
stateOrProvinceName_default    = Russian Federation
localityName_default           =
0.organizationName_default     = RAMC
organizationalUnitName_default = RAMC/CaRMa Caroperator CA
commonName_default             = RAMC/CaRMa Caroperator Root CA
emailAddress_default           = [email protected]

[ 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

[ ocsp ]
# Extension for OCSP signing certificates (`man ocsp`).
basicConstraints = CA:FALSE
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid,issuer
keyUsage = critical, digitalSignature
extendedKeyUsage = critical, OCSPSigning