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The first step includes to create a private key the root-ca.key private key file and self-signed certificate the root-ca.crt for self-signed certificate file for the Root CA both in PEM format. This step is performed just once.
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# Specify server for which the certificate should be created
SERVER=somehost
# Step 1 - Generate Private Key and Certificate Signing Request
openssl req -new -config openssl-cert.config -extensions 'standard exts' -nodes \
-days 7300 -newkey rsa:4096 -keyout ${SERVER}.key -out ${SERVER}.csr
# Step 2 - Generate and Sign the Server Certificate
openssl x509 -req \
-in ${SERVER}.csr \
-CA root-ca.crt \
-CAkey root-ca.key \
-CAcreateserial \
-out ${SERVER}.crt -days 7300 \
-extfile <(printf "subjectAltName=DNS:${SERVER}\nnsCertType = client, server\nkeyUsage = digitalSignature, keyEncipherment\nextendedKeyUsage = serverAuth, clientAuth\n") |
Explanation:
- The following files will be created for the given server:
<SERVER>.key: the private key<SERVER>.csr: the Certificate Signing Request<SERVER>.crt: the Server Certificate
In order to run the script successfully the following openssl-cert.config file has to be present. To create a server certificate the CommonName attribute has to be adjusted.
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