OpenSSL applications can also use the CONF library for their own purposes. Now in common-field, we use www.example.com version â if SSL is for www and non-www versions of domains. A configuration file ⦠You can create a folder with PowerShell by running the below command. After setting up nginx config file everything worked perfectly. This will create sslcert.csr and ⦠The â-nodesâ parameter avoids setting a password to the private key. Here is a complete example ssl.cnf file. .ec.key -config domain >.ec.conf -out domain >.ec.csr Hopefully that all makes sense.If you are able to decode the CSR file, send the file to the certificate management team to produce a new certificate. So I added it again here. This tutorial will store all certificates and related files in the C:\certs folder. Note: alt_names section is the one you have to change for additional DNS. It is used for the OpenSSL master configuration file openssl.cnf and in a few other places like SPKAC files and certificate extension files for the x509 utility. Run OpenSSL command. My normal certificate creation process is to generate an openssl.cnf file, then using this file generate a csr (certificate signing request), and then generate a certificate from the csr using my own CA. Return to How to Configure Let's Encrypt with acme_tiny.py Sending the CSR to the CA When you are ready to send the CSR to the CA (e.g., DigiCert), you need to do so using the PEM formatâthe raw, encoded text of the CSR that you ⦠Save the file and execute the following OpenSSL command, which will generate CSR and KEY file; openssl req -out sslcert.csr -newkey rsa:2048 -nodes -keyout private.key -config san.cnf. The command generates the certificate (-out) and the private key (-keyout) by using the configuration file (-config). This is because CSR files are digitally signed, meaning if even a single character is changed in the file it will be rejected by the CA. Note: I couldnât find out whether we need to add domain used in common-name field again here. If more SAN names are needed, add more DNS lines in the [alt_names] section. You will first create/modify the below config file to generate a private key. Create a configuration file. Below are the basic steps to use OpenSSL and create a TLS certificate request using a config file and a private key. Change alt_names appropriately. By default, OpenSSL on Windows 10 does not come with a configuration file. Then you will create a .csr. I was able to obtain the ssl certificate using this command from an Ubuntu 14.04 machine: openssl s_client -connect MyIP:443 -ssl3 -cipher RC4-SHA:RC4-MD5 Nginx config i ⦠# subjectAltName = @alt_names Complete example. This CSR is the file you will submit to a certificate authority to get back the public cert. Generate a private key: $ openssl genrsa -out san.key 2048 && chmod 0600 san.key. "openssl.exe" x509 -req -days 730 -in request.req -CA ca.crt -CAkey ca.key -set_serial 02 -extensions req_ext ⦠OpenSSL CSR with Alternative Names one-line. Now you have your OpenSSL config file ready. The OpenSSL CONF library can be used to read configuration files. Now itâs time to configure OpenSSL. Next page: First edit of Apache configuration â for Let's Encrypt challenge-response. New-Item -ItemType Directory -Path C:\certs. The .cnf file is a plain text file which contains a section describing all the SANs that I would like included in the csr ⦠$ cat << EOL > san.conf [ req ] default_bits = 2048 default_keyfile = san.key #name of the keyfile distinguished_name = req_distinguished_name req_extensions = req_ext ⦠After setting up nginx config file to generate a private key ( -keyout ) by the. 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