OpenSSL Generating a Certificate Signing Request
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Generate the Certificate Signing Request (CSR)
Apache with mod_ssl Enabled (No subjectAltName)
- If required follow the OpenSSL Generating a Private Key procedure.
- For Apache purposes, use the key with no pass phrase to generate the CSR file.
- Generate the CSR from the private key using openssl.
- # openssl req -new -key <key_name>.key -out <csr_name>.csr
- Enter the information as required by the prompts.
- Verify the checksum of the key matches the checksum CSR.
- # openssl req -noout -modulus -in <csr_name>.csr | openssl md5
Apache with mod_ssl Enabled (With subjectAltName)
- If required follow the OpenSSL Generating a Private Key procedure.
- For Apache purposes, use the key with no pass phrase to generate the CSR file.
- Create a config file to be configured with the multiple subdomains.
- # cat << EOL >> <config_file>.cnf
- [ req ]
#:default_bits = 2048 #:default_keyfile = <private_key>.key #:distinguished_name = req_distinguished_name #:req_extensions = req_ext
- [ req_distinguished_name ]
- countryName = Country Name (2 letter code)
- countryName_default = US
- stateOrProvinceName = State or Province Name (full name)
- stateOrProvinceName_default = New York
- localityName = Locality Name (eg, city)
- localityName_default = New York
- organizationName = Organization Name (eg, company)
- organizationName_default = Example
- commonName = Common Name (e.g. server FQDN or YOUR name)
- commonName_max = 64
- [ req_ext ]
- subjectAltName = @alt_names
- [alt_names]
- DNS.1 = <domain>.com
- DNS.2 = www.<domain>.com
- DNS.3 = *.<domain>.com
- EOL
- Generate the CSR from the private key using openssl.
- # openssl req -new -key <key_name>.key -out <csr_name>.csr
- Enter the information as required by the prompts.
- Verify the checksum of the key matches the checksum CSR.
- # openssl req -noout -modulus -in <csr_name>.csr | openssl md5