We'll also need to add a config file. Make sure you have replaced the [server_dn] and [alt_names] with your information, or you can customize your own options as needed. If you would prefer a 4096-bit key, you can change this number to 4096.-keyout PRIVATEKEY.key specifies where to save the private key file.-out MYCSR.csr specifies where to save the CSR file. Run the following command to create the certificate: cd /nsconfig/ssl openssl req -x509 -nodes -days 730 -newkey rsa:2048 -keyout cert.pem -out cert.pem -config req.conf -extensions 'v3_req' I'm getting error Next we will create the CA answer file which we will use (as mentioned) only for the CA creation. One is (and obviously) the Server key and the other is the server certificate request. Feel free to change the DN and the DNS values as you see fit. "openssl.exe" x509 -req -days 730 -in request.req -CA ca.crt -CAkey ca.key -set_serial 02 -extensions req_ext -extfile ssl.conf -out request.crt. This has been working great for my local development setup until a recent PHP-built project. for the following step we will create 2 additional files for our server (registry). For that purpose we can apply DNS alternative names to our SSL certificates. On a WampServer v3.2.2 install I just did the configuration filename was openssl.cnf. One the command was successful you can run “ls” and see the 2 files we created : for the following step we will create 2 additional files for our server (registry). You signed in with another tab or window. Certificate Signing Request – CSR generation. Add multiple SANs into your CSR with OpenSSL. openssl x509 -req -days 3650 -in server.csr -signkey server.key -out server.crt -extensions v3_req -extfile openssl.cnf. as a why of work we will always start with generate the RSA key with the length of 4096 (at the very list) . Copy your default openssl.cnf file to a temporary openssl-san.cnf file ; Edit the openssl-san.cnf file to add addtl. You need to tell openssl to create a CSR … Generate a private key: $ openssl genrsa -out san.key 2048 && chmod 0600 san.key. It uses file_get_contents() and I've started getting this PHP error which seems to have 100+ fixes, but I have a feeling it's something to do with these certs not being properly registered: Many thanks! This page is the result of my quest to to generate a certificate signing requests for multidomain certificates. now comes the tricky part , we need to tell the CA to use the “altrnames” we setup in the answer file but we need to tell it which section to look at for the values we need so we are going to add 2 more arguments for this purpose. Changing the permissions to 600 (i.e. Transfer to Us TRY ME. This extra stuff was all in the request, but was ignored and not added to the output cert. I want to be able to view CSR's with subjectAltName's but I can't figure out any way to make it happen. If more SAN names are needed, add more DNS lines in the [alt_names] section. Please safely keep server.key for certificate implementation. Clone with Git or checkout with SVN using the repository’s web address. Since we have used prompt=no and have also provided the CSR information, there is no output for this command but our CSR is generated # ls -l ban21.csr -rw-r--r-- 1 root root 1842 Aug 10 15:55 ban21.csr. First we’ll need some rsa keys generating, where the key file is called key.pem: openssl genrsa -out key.pem 2048 Now we can generate a CSR (certificate signing request), but only after we have added a special config file, which we’ll call cert-config.txt Creating these config files, however, is not easy! When prompted for the Common Name (domain name), type the fully qualified domain (FQDN) for the site that you are going to secure. Comment générer un CSR avec openssl? Step 2 – Using OpenSSL to generate CSR’s with Subject Alternative Name extensions. Next, we will generate CSR using private key above AND site-specific copy of OpenSSL config file. Create a new configuration file, v3.cnf, that can host the information for the v3 requirements.Edit it to contain the following lines: [v3_req] subjectAltName = @alt_names [alt_names] DNS.1 = hostname.example.com Run the following OpenSSL command to generate a self-signed certificate using the CSR and your local key: This difference in OpenSSL configuration file extension names appears to be compile dependent. countryName = optional stateOrProvinceName = optional localityName = optional organizationName = optional organizationalUnitName = optional commonName = supplied emailAddress = optional [req ] # Options for the `req` tool (`man req`). 3. NET::ERR_CERT_AUTHORITY_INVALID. Thank you. Create a new configuration file, v3.cnf, that can host the information for the v3 requirements.Edit it to contain the following lines: [v3_req] subjectAltName = @alt_names [alt_names] DNS.1 = hostname.example.com Run the following OpenSSL command to generate a self-signed certificate using the CSR and your local key: Here we can generate or renew an existing certificate where we miss the CSR file due to some reason. Here is a complete example ssl.cnf file. When running the “openssl” command without an answer file the command will ask use to feel in the blanks (unless we set then up in openssl.cnf in advanced). leevigraham/Generate ssl certificates with Subject Alt Names on OSX.md, https://security.stackexchange.com/questions/74345/provide-subjectaltname-to-openssl-directly-on-the-command-line, http://itinfosecurity.blogspot.com/2017/02/openssl-certificates-and-extentions.html, http://apetec.com/support/GenerateSAN-CSR.htm, https://www.openssl.org/docs/manmaster/man5/x509v3_config.html, distinguished_name = req_distinguished_name, countryName = Country Name (2 letter code), stateOrProvinceName = State or Province Name (full name), localityName = Locality Name (eg, city), organizationName = Organization Name (eg, company), organizationName_default = Hallmarkdesign, commonName = Common Name (e.g. Below are the basic steps to use OpenSSL and create a certificate request using a config file and a private key. https://www.openssl.org/docs/manmaster/man5/x509v3_config.html. Next, we will generate CSR using private key above AND site-specific copy of OpenSSL config file. Verify CSR openssl genrsa -out ssl.key 2048 openssl req -new -config ssl.conf -key ssl.key -out ssl.csr openssl x509 -req -sha256 -days 3650 -CAcreateserial -CAkey root.key -CA root.crt -in ssl.csr -out ssl… Create an OpenSSL configuration file (text file) on the local computer by editing the fields to the company requirements. The private key is stored with no passphrase. In our tutorial I will setup a certificate for my docker registry and at the end I will show additional step due to the way the docker command works. In order to get a certificate installed, there are a few steps to follow. openssl can make life easy be creating its keys, CSRs and certificates on the basis of config files. Sense we need the CA to generate (and verify) our server certificate we are creating a request file so the CA will read for certificate details. Generate CSR (Interactive) Here,-newkey: This option creates a new certificate request and a new private key. Because we want to include a SAN (Subject Alternative Name) in our CSR (and certificate), we need to use a customized openssl.cnf file. Test. Snippet output from my terminal for this command. Here's the ssl.conf I ended up with. Hi I've just been creating an ECDSA-keyed CSR using a config file and ran into what I think is a bug. $ 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 [ req_distinguished_name ] countryName = Country Name (2 letter code) … Solved: Hi, Using Splunk (v6.5.0) on Windows Server 2008 R2 Datacenter, trying to generate CSR files using the built-in openssl via PowerShell Edit the domain(s) listed under the [alt_names] section so that they match the local domain name you want to use for your project, e.g. It is a very good practice at this point to Test the CSR for DNS alternative names : If you received the output as in the example you are good to go. Sur le serveur GNU/Linux nous allons générer : 1. une clé privée 2. une clé publique 3. une CSR (signée numérique avec la clé privée, contient aussi la clé publique) Cette CSR sera ensuite soumise à l'autorité Active Directory qui retournera le certificat multi-domaine/SAN associé (les 2 sont possibles). OpenSSL CSR with Alternative Names one-line. I also did a Window10 64-bit install using the binaries from Shining Path Productions. Generate a private key: $ openssl genrsa -out san.key 2048 && chmod 0600 san.key. Once multisan.conf file has been created create CSR file and private key to be used with certificate with following command: openssl req -new -nodes -out multisan.csr -config multisan.conf This will automatically write private key to multisan.key file in the same location you executed the command. Change alt_names appropriately. Thank you for this post!!!! , certificate will be signed with SHA1 ( which is deprecated ) # see the FORMAT... 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