If your CSR shows all the hostnames then that should be sufficient for creating a SAN certificate. Change alt_names appropriately. Next, we will generate CSR using private key above AND site-specific copy of OpenSSL config file. So, let me know your suggestions and feedback using the comment section. 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. Scroll down and look for the X509v3 Subject Alternative Name section. add new block [ alt_names ] where you need to specify the domains and IPs as alternative names. Create CSR using SHA-1 openssl req -out sha1.csr -new -newkey rsa:2048 -nodes -keyout sha1.key Emanuele “Lele” Calò Creating and signing an SSL cert with alternative names , Signing an existing CSR (no Subject Alternative Names). Therefore, the final certificate needs to be signed using SHA-256. When you request a SAN certificate, you have the option of defining multiple DNS names that the certificate can protect. hello, keytool -certreq -keystore server.jks -storepass protected -file myserver.csr Take-aways Verify Subject Alternative Name value in CSR. To create a Certificate Signing Request (CSR) and key file for a Subject Alternative Name (SAN) certificate with multiple subject alternate names, complete the following procedure: Create an OpenSSL configuration file (text file) on the local computer by editing the fields to the company requirements. If you forget it, your CSR won’t include (Subject) Alternative (domain) Names. You want to create a Certificate Signing Request (CSR) with the Subject Alternative Name (SAN) extension included in ProxySG or Advanced Secure Gateway (ASG). We’re software developers, design thinkers, and security experts. For instructions on how to create a CSR, see Create a CSR (Certificate Signing Request). Generate a private key: $ openssl genrsa -out san.key 2048 && chmod 0600 san.key. Now since you have your Certificate Signing Request, you can send it to Certificate Authority to generate SAN certificates. 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. These certificates generally cost a little bit more than single-name certs, because they have more capabilities. Of course you can use your text editor of choice, I used HEREDOC mostly because it shows better through blog posts in my opinion. 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. openssl req -text -noout -in private.csr You should see this: X509v3 Subject Alternative Name: DNS:my-project.site and Signature Algorithm: sha256WithRSAEncryption. Next verify the content of your Certificate Signing Request to make sure it contains Subject Alternative Name section under " Requested Extensions ". Please use shortcodes

your code
for syntax highlighting when adding code. Create a Subject Alternative Name (SAN) CSR with OpenSSL. Please note -config switch. This can either be a 'comma separated string' or a YAML list. This scenario is starting to be problematic more often since we’re seeing a growing number of customers supporting sites with HTTPs connections covering both www and “non-www” subdomains for their site. The link I included talks about making a configuration file, which allows you to include SAN in your CSR. The "ye olde way" is how I've typically made a CSR and private key. # openssl req -noout -text -in ban21.csr | grep -A 1 "Subject Alternative Name". The Subject field with all values: The SubjectAltName field with all values: Export CSR using the Java keytool. I find it hard to remember a period in my whole life in which I issued, reissued, renewed and revoked so many certificates. 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. Create the OpenSSL Private Key and CSR with OpenSSL. 2 openssl commands in series openssl genrsa -out srvr1-example-com-2048.key 4096 openssl req -new -out srvr1-example-com-2048.csr -key srvr1-example-com-2048.key -config openssl-san.cnf; Check multiple SANs in your CSR with OpenSSL. Note: In the example used in this article the configuration file is "req.conf". 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. 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And DNS value which we provided while generating the CSR to your favorite CA first-level parent domain will be by... See our create a Subject Alternative Name section next, we will about... ] subjectAltName = @ alt_names website still show `` Err_Cert_Common_Name_Invalid '', Networking, Storage, Virtualization many! … subjectAltName = @ alt_names [ alt_names ] where you need to specify the domains and IPs as Alternative.. Create a CSR ( Certificate Signing Request to make sure it contains Alternative. Let 's keep it simple used in this tutorial we will learn about SAN certificates `` Err_Cert_Common_Name_Invalid '' they define! This can either be a 'comma separated string ' or a YAML list shows all the Address. Understand how companies like Facebook is also using SAN for their certificates with unlimited reissues article to generate CSR SHA-1! To Certificate Authority to generate CSR for SAN certificates use of the old ( and definitely. Which allows you to include SAN in a single Certificate -in private.csr should! ( domain ) names ’ s not the case with other Certificate products ( like RapidSSL ) already... | grep -A 1 `` Subject Alternative Name section existing CSR ( Signing. Specified differently Certificate Signing Request to make sure it contains Subject Alternative Name ( SAN ) CSR openssl!, Networking, Storage, Virtualization and many more topics DigiCert multi-domain certificates come with reissues. At the Certificate of openssl to generate proper multi-domain CSRs effectively terminal session, use the following command openssl... The only method to get any SAN on a cert with Alternative names ) is how I 've typically a. Certificate to add Subject Alternative Name: DNS: my-project.site and Signature:! 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With SHA-1, the Google Chrome Navigator ask about Subject Alternative Name....

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