[ alt_names ] … Where I'm wrong? 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. 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. For instructions on how to create a CSR, see Create a CSR (Certificate Signing Request). Next we will use openssl to generate our Certificate Signing Request for SAN certificate. Repeat the CN(certificate common name) in SAN along with the other DNS entires. openssl x509 -req \ -sha256 \ -days 3650 \ -in private.csr \ -signkey private.key \ -out private.crt \ -extensions req_ext \ … 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. Next verify the content of your Certificate Signing Request to make sure it contains Subject Alternative Name section under " Requested Extensions ". keytool -certreq -keystore server.jks -storepass protected -file myserver.csr Take-aways What are SAN (Subject Alternative name) Certificates, Verify Subject Alternative Name value in CSR, beginners guide to understand all certificate related terminologies used with openssl, Create SAN Certificate to protect multiple DNS, CN and IP Addresses of the server in a single certificate, Simple steps to generate CSR using openssl with examples, 15 steps to setup Samba Active Directory DC CentOS 8, Understand certificate related terminologies, Configure secure logging with rsyslog TLS, Transfer files between two hosts with HTTPS, 5 useful tools to detect memory leaks with examples, 100+ Linux commands cheat sheet & examples, List of 50+ tmux cheatsheet and shortcuts commands, RHEL/CentOS 8 Kickstart example | Kickstart Generator, 10 single line SFTP commands to transfer files in Unix/Linux, Tutorial: Beginners guide on linux memory management, 5 tools to create bootable usb from iso linux command line and gui, 30+ awk examples for beginners / awk command tutorial in Linux/Unix, Top 15 tools to monitor disk IO performance with examples, Overview on different disk types and disk interface types, 6 ssh authentication methods to secure connection (sshd_config), 27 nmcli command examples (cheatsheet), compare nm-settings with if-cfg file, How to zip a folder | 16 practical Linux zip command examples, How to check security updates list & perform linux patch management RHEL 6/7/8, Steps to install Kubernetes Cluster with minikube, Kubernetes labels, selectors & annotations with examples, How to perform Kubernetes RollingUpdate with examples, Kubernetes ReplicaSet & ReplicationController Beginners Guide, How to assign Kubernetes resource quota with examples, 50 Maven Interview Questions and Answers for freshers and experienced, 20+ AWS Interview Questions and Answers for freshers and experienced, 100+ GIT Interview Questions and Answers for developers, 100+ Java Interview Questions and Answers for Freshers & Experienced-2, 100+ Java Interview Questions and Answers for Freshers & Experienced-1. When you request a SAN certificate, you have the option of defining multiple DNS names that the certificate can protect. So when needed, you can add SANS to your certificate. 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 This single certificate can be installed on a web server and used to validate traffic for any of the DNS names that are contained in the certificate. Thanks to all our readers for all the hints, ideas and suggestiong they gave me to improve this post, which apparently is still very useful to a lot of System Administrators out there. Certificate Signing Request – CSR generation. For example have a look at the certificate of. $ 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 = … Emanuele “Lele” Calò Subject Alternative Name (SAN) extension to attach to the certificate signing request. 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. October 30, 2014. 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. Now with that I’m able to generate proper multi-domain CSRs effectively. Please note -config switch. If this was created for intranet then you can also create your own CA certificate or CA certificate chain and use these CA to sign and generate your server certificates. 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. The link I included talks about making a configuration file, which allows you to include SAN in your CSR. 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 … Let’s take a look at a real-time example of skype.com, which has many SAN in a single certificate. Address and DNS value which we provided while generating the CSR is only available with SHA-1, CA! Csr, see create a CSR ( no Subject Alternative names ( SANs ) DigiCert multi-domain come... 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