#!/bin/bash -xe

hostname=$(hostname -f)
issuer=$(hostname -d)
ca="$issuer-ca"
chain="$issuer-chain"

rm -rf ca
mkdir -p ca
cd ca

# generate root ca
mkdir -p certs crl newcerts private
chmod 700 private
touch index.txt
echo 1000 > serial

cat > openssl.cnf <<EOF
[ ca ]
# man ca
default_ca = CA_default

[ CA_default ]
# Directory and file locations.
dir               = $(pwd)
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                     = US
stateOrProvinceName             = OR
localityName                    = Hillsboro
0.organizationName              = Intel Corporation
organizationalUnitName          = NPG
commonName                      = Common Name
emailAddress                    = nobody@intel.com

[ 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
EOF

openssl genrsa -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/$ca.cert.pem -subj "/C=US/ST=OR/O=Intel/CN=$ca"
chmod 444 certs/$ca.cert.pem

# generate intermediate cert
mkdir -p $issuer
cd $issuer
mkdir -p certs crl csr newcerts private
chmod 700 private
touch index.txt
echo 1000 > serial
echo 1000 > crlnumber

cat > openssl.cnf <<EOF
[ ca ]
# man ca
default_ca = CA_default

[ CA_default ]
# Directory and file locations.
dir               = $(pwd)
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/$issuer.key.pem
certificate       = \$dir/certs/$issuer.cert.pem

# For certificate revocation lists.
crlnumber         = \$dir/crlnumber
crl               = \$dir/crl/$issuer.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_loose

[ 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                     = 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

# Optionally, specify some defaults.
countryName_default             = GB
stateOrProvinceName_default     = England
localityName_default            =
0.organizationName_default      = Alice Ltd
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, dataEncipherment, nonRepudiation
extendedKeyUsage = serverAuth
subjectAltName = DNS:$(hostname -f), DNS:$(hostname) 

[ 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
EOF

openssl genrsa -out private/$issuer.key.pem 4096
chmod 400 private/$issuer.key.pem

openssl req -config openssl.cnf -new -sha256 -key private/$issuer.key.pem -out csr/$issuer.csr.pem -subj "/C=US/ST=OR/O=Intel/CN=$issuer"

cd ..
yes | openssl ca -config openssl.cnf -extensions v3_intermediate_ca -days 3650 -notext -md sha256 -in $issuer/csr/$issuer.csr.pem -out $issuer/certs/$issuer.cert.pem
chmod 444 $issuer/certs/$issuer.cert.pem

# generate a certificate chain
cat $issuer/certs/$issuer.cert.pem certs/$ca.cert.pem > $issuer/certs/$chain.cert.pem
openssl x509 -outform pem -in $issuer/certs/$issuer.cert.pem -out $issuer/certs/$issuer.cert.crt
openssl x509 -outform pem -in certs/$ca.cert.pem -out certs/$ca.cert.crt

# generate a server certificate
openssl genrsa -out $issuer/private/$hostname.key.pem 2048
chmod 400 $issuer/private/$hostname.key.pem

openssl req -config $issuer/openssl.cnf -key $issuer/private/$hostname.key.pem -new -sha256 -out $issuer/csr/$hostname.csr.pem -subj "/C=US/ST=OR/O=Intel/CN=$hostname"

yes | openssl ca -config $issuer/openssl.cnf -extensions server_cert -days 375 -notext -md sha256 -in $issuer/csr/$hostname.csr.pem -out $issuer/certs/$hostname.cert.pem
chmod 444 $issuer/certs/$hostname.cert.pem

echo
echo "chain: $(pwd)/$issuer/certs/$chain.cert.pem"
echo "cert: $(pwd)/$issuer/certs/$hostname.cert.pem"
echo "key: $(pwd)/$issuer/private/$hostname.key.pem"

cd ..
cp ca/$issuer/certs/$chain.cert.pem .
cp ca/$issuer/certs/$issuer.cert.crt .
cp ca/certs/$ca.cert.crt .
cat > copy-cert.sh <<EOF
#!/bin/bash -e 

certpath=/etc/pki/ca-trust/source/anchors
if [ -d \$certpath ]; then
    sudo cp $chain.cert.pem \$certpath
    sudo update-ca-trust extract
else
    certpath=/usr/local/share/ca-certificates/extra
    sudo mkdir -p \$certpath
    sudo cp $issuer.cert.crt \$certpath
    sudo cp $ca.cert.crt \$certpath
    sudo update-ca-certificates
fi
EOF

chmod a+rx copy-cert.sh
mkdir -p certs
cat ca/$issuer/certs/$hostname.cert.pem ca/$issuer/certs/$chain.cert.pem | sudo tee certs/$hostname.cert.pem > /dev/null
sudo cp ca/$issuer/private/$hostname.key.pem certs