more openssl-csr.conf [ req ] default_bits = 2048 distinguished_name = req_distinguished_name req_extensions = req_ext [ req_distinguished_name ] countryName = GB stateOrProvinceName = Cambs localityName = Peterborough organizationName = Net Assured Limited commonName = Common Name (e.g. Configuration: To create a new CSR with multiple DNS entries in SAN, login to ClearPass policy manager UI and navigate to Administration >> Certificates >> Server Certificate >> Create Certificate Signing Request and create a CSR with SAN entries as shown below. Please use shortcodes for syntax highlighting when adding code. The "ye olde way" is how I've typically made a CSR and private key. The creation of CSR for SAN is slightly different than traditional OpenSSL command and will explain in a while how to generate CSR for Subject Alternative Names SSL certificate. Once issued, the SAN certificate will contain a primary DNS name, which is typically the main name of the website, and, further inside the cert properties, you will find listed the additional DNS names that you specified during your request. Signing a csr with subjectAltName using x509 command. First up, let’s have a look at the CSR and see what SANs were requested; openssl req -text -noout -verify -in server.example.com.csr. Now, if you want to include all those SANs, then the openssl.cnf you used to sign will have to have all those SANs already defined. In the Lab - OpenSSL. For instructions on how to create a CSR, see Create a CSR (Certificate Signing Request). openssl req -text -noout -in private.csr You should see this: X509v3 Subject Alternative Name: DNS:my-project.site and Signature Algorithm: sha256WithRSAEncryption. hello, $ openssl req -new -key ${SHORT_NAME}.key -out ${SHORT_NAME}.csr -config <( cat ${SHORT_NAME}_answer.txt ) It is a very good practice at this point to Test the CSR for DNS alternative names : $ openssl req -in ${SHORT_NAME}.csr -noout -text | grep DNS DNS:registry, DNS:registry.example.local. Generate a private key and Certificate Signing Request by using the sancert.cnf configuration file. Next, we will generate CSR using private key above AND site-specific copy of OpenSSL config file. To try this in the lab, we create a CSR using OpenSSL by creating a config file to be referenced by the openssl req command which can generate a key pair and Certificate Signing Request (CSR) with the WSANs included as shown below: Create a Certificate Signing Request (CSR) "openssl req -newkey rsa:2048 -keyout server_key.pem -out server_req.pem" Review the CSR to verify the Subject Alternative Name has been added as expected "openssl req -text -in server_req.pem" @EddieJennings said in OpenSSL CSR with Subject Alternative Name: @JaredBusch Correct. Let’s take a look at a real-time example of skype.com, which has many SAN in a single certificate. Create CSR using SHA-1 openssl req -out sha1.csr -new -newkey rsa:2048 -nodes -keyout sha1.key I find it hard to remember a period in my whole life in which I issued, reissued, renewed and revoked so many certificates. [ alt_names ] … $ 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) countryName_default = … openssl subject alternative name. 1.Login to Linux server where the OpenSSL utility is available. We’re software developers, design thinkers, and security experts. By adding DNS.n (where n is a sequential number) entries under the “subjectAltName” field you’ll be able to add as many additional “alternate names” as you want, even not related to the main domain. We design and build custom software solutions. Of course you can use your text editor of choice, I used HEREDOC mostly because it shows better through blog posts in my opinion. Creating Wildcard self-signed certificates with openssl with subjectAltName (SAN - Subject Alternate Name) For the past few hours I have been trying to create a self-signed certificate for all the sub-domains for my staging setup using wildcard subdomain. Please note -config switch. That’s why I prefer creating a dedicated file (that you can also reuse in future) and then pipe that in openssl. This need is due to the fact that some certificate providers (like GeoTrust) don’t cover the parent domain when requesting a new certificate (eg: CSR for www.endpoint.com won’t cover endpoint.com), unless you specifically request so. Generate the certificate. After generating a certificate out of it, the certificat doesn't show any of these entries (like in your first screenshot) This article will walk you through how to create a CSR file using the OpenSSL command line, how to include SAN (Subject Alternative Names) along with the common name, how to remove PEM password from the generated key file. My Code By adding DNS.n (where n is a sequential number) entries under the “subjectAltName” field you’ll be able to add as many additional “alternate names” as you want, even not related to the main domain. How to Duplicate a Certificate with Subject Alternative Names (SANs) On the server for which you want the duplicate Wildcard Certificate with SANs, create a new CSR/keypair. openssl req -new -key example.com.key -out example.com.csr -config example.com.cnf. For example have a look at the certificate of. 2017-02-16—Edit—I changed this post to use a different method than what I used in the original version cause X509v3 extensions were not created or seen correctly by many certificate providers. Because we want to include a SAN (Subject Alternative Name) in our CSR (and certificate), we need to use a customized openssl.cnf file. For example: Reissue your multi-domain SSL/TLS certificate to add subject alternative names (SANs) DigiCert multi-domain certificates come with unlimited reissues. I have not assigned any passphrase to the private key, you can also use -des3 encryption algorithm to add a passphrase to your private key, We will not use the complete /etc/pki/tls/openssl.cnf instead we will create our own custom ssl configuration file with required parameters only. Openssl sign CSR with Subject Alternative Name Next use the server.csr to sign the server certificate with -extfile using Subject Alternative Names to create SAN certificate I am using my CA Certificate Chain and CA key from my previous article to issue the server certificate So, let me know your suggestions and feedback using the comment section. Hi everyone, As most of us know, the Google Chrome Navigator ask about Subject Alternative Name instead the Common Name. Emanuele “Lele” Calò Create the OpenSSL Private Key and CSR with OpenSSL. The command below will export the Certificate Signing Request (CSR) into myserver.csr file. Posted on 02/02/2015 by Lisenet. 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, Next verify the content of your Certificate Signing Request to make sure it contains Subject Alternative Name section under "Requested Extensions". So here’s an example to generate a CSR which will cover *.your-new-domain.com and your-new-domain.com, all in one command: To be honest, that’s a sub-optimal solution for a few reasons but mostly that it’s not comfortable to fix in case you did a typo or similar. 4.When prompted, enter the appropriate information. Repeat the CN(certificate common name) in SAN along with the other DNS entires. openssl x509 -req -in certificate.csr -CA servoCA-root.pem -CAkey servoCA-key.pem -CAcreateserial -out wikiCERT-pub.pem -days 365 -sha512. The Subject field with all values: The SubjectAltName field with all values: Export CSR using the Java keytool. If your CSR shows all the hostnames then that should be sufficient for creating a SAN certificate. Scroll down and look for the X509v3 Subject Alternative Name section. In case the CSR is only available with SHA-1, the CA can be used to sign CSR requests and enforce a different algorithm. Now since you have your Certificate Signing Request, you can send it to Certificate Authority to generate SAN certificates. You are welcomed to send the CSR to your favorite CA. If you are not familiar with these parameters then I suggest you to read beginners guide to understand all certificate related terminologies used with openssl and openssl configuration file, If you prefer to manually enter the CSR details such as Country, State, Common Name etc then you can use this configuration file. Lastly I hope the steps from the article to generate csr for SAN on Linux using openssl was helpful. So when needed, you can add SANS to your certificate. add new block [ alt_names ] where you need to specify the domains and IPs as alternative names. Security, Encryption, Vulnerability Mitigation. Yes, using a config file is the only method to get any SAN on a cert with OpenSSL. Linux, Cloud, Containers, Networking, Storage, Virtualization and many more topics. Next we will use openssl to generate our Certificate Signing Request for SAN certificate. To generate CSR for SAN we need distinguished_name and req_extensions, I have also added the value for individual distinguished_name parameters in this configuration file to avoid user prompt. Luckily the solution is pretty simple and straight-forward and the only requirement is that you should type the CSR subject on the command line directly, basically without the use of the interactive question mechanism. Luckily that’s not the case with other Certificate products (like RapidSSL) which already offer this feature built-in. Requested Extensions: X509v3... OpenSSL › OpenSSL - User. Do you see the DNS/IP Address in your certificate, can you share the output of following command? 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Making an openssl ca -policy policy_anything -out server.example.com.crt -infiles So by using the common syntax for OpenSSL subject written via command line you need to specify all of the above (the OU is optional) and add another section called … The link I included talks about making a configuration file, which allows you to include SAN in your CSR. First of all we need a private key. From a bash or terminal session, use the following command: openssl req -new -nodes -keyout myserver.key -out server.csr -newkey rsa:2048 -config sancert.cnf. So our CSR contains all the IP Address and DNS value which we provided while generating the CSR for SAN. Now I could have combined the steps to generate private key and CSR for SAN but let's keep it simple. # openssl req -noout -text -in ban21.csr | grep -A 1 "Subject Alternative Name". 0600 san.key ( and now definitely deprecated SHA1 ) was helpful of us know, the Google Chrome Navigator about! 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