... For more information about creating a CSR, see our Create a CSR (Certificate Signing Request) page. 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. @EddieJennings said in OpenSSL CSR with Subject Alternative Name: @JaredBusch Correct. 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". 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. Values must be prefixed by their options. 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 You must keep your private key safely as this CSR will only work with this private key. openssl.cnf asking Subject Alternative Names certificates. 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. Applications with specific requirements MAY use such names, but they must define the semantics. Emanuele “Lele” Calò 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. 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. 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. Now since you have your Certificate Signing Request, you can send it to Certificate Authority to generate SAN certificates. This can either be a 'comma separated string' or a YAML list. subjectAltName = @alt_names. The Subject field with all values: The SubjectAltName field with all values: Export CSR using the Java keytool. Note: In the example used in this article the configuration file is "req.conf". Where I'm wrong? Posted on 02/02/2015 by Lisenet. 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 Repeat the CN(certificate common name) in SAN along with the other DNS entires. You are welcomed to send the CSR to your favorite CA. 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. Resolution The following solution details steps to create a CSR with the SAN extension using a … If you forget it, your CSR won’t include (Subject) Alternative (domain) Names. Therefore, the final certificate needs to be signed using SHA-256. 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. Next verify the content of your Certificate Signing Request to make sure it contains Subject Alternative Name section under " Requested Extensions ". 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. 4.When prompted, enter the appropriate information. Obviously the first-level parent domain will be covered by most SSL products, unless specified differently. The link I included talks about making a configuration file, which allows you to include SAN in your CSR. If your CSR shows all the hostnames then that should be sufficient for creating a SAN certificate. And while that’s usually fun and interesting, there’s one thing I often needed and never figured out, till a few days ago, which is how to generate CSRs (Certificate Signing Requests) with AlternativeNames (eg: including www and non-www domain in the same cert) with a one-liner 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. I find it hard to remember a period in my whole life in which I issued, reissued, renewed and revoked so many certificates. 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. 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. Do you see the DNS/IP Address in your certificate, can you share the output of following command? my csr output shows three SAN entries as you show in your last screenshot. So when needed, you can add SANS to your certificate. Generate a private key: $ openssl genrsa -out san.key 2048 && chmod 0600 san.key. Now with that I’m able to generate proper multi-domain CSRs effectively. hello, The command below will export the Certificate Signing Request (CSR) into myserver.csr file. Let’s take a look at a real-time example of skype.com, which has many SAN in a single certificate. Subject Alternative Name (SAN) extension to attach to the certificate signing request. $ 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 = … For example: By keytool -certreq -keystore server.jks -storepass protected -file myserver.csr Take-aways Because we want to include a SAN (Subject Alternative Name) in our CSR (and certificate), we need to use a customized openssl.cnf file. October 30, 2014. Log into your DigiCert Management Console. 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. Unfortunately the error message on my website still show "Err_Cert_Common_Name_Invalid". Linux, Cloud, Containers, Networking, Storage, Virtualization and many more topics. Here replace server.cert.pem with your server certificate. To create a self-signed SAN certificate with multiple subject alternate names, complete the following procedure: Create an OpenSSL configuration file on the local computer by editing the fields to the company requirements. openssl x509 -req -in certificate.csr -CA servoCA-root.pem -CAkey servoCA-key.pem -CAcreateserial -out wikiCERT-pub.pem -days 365 -sha512. $ 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. Since 1995 we’ve built our reputation by bringing expertise and care to your projects. So, let me know your suggestions and feedback using the comment section. Verify CSR That’s why I prefer creating a dedicated file (that you can also reuse in future) and then pipe that in openssl. These certificates generally cost a little bit more than single-name certs, because they have more capabilities. Generate the certificate. 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 … Yes, using a config file is the only method to get any SAN on a cert with OpenSSL. Of course you can use your text editor of choice, I used HEREDOC mostly because it shows better through blog posts in my opinion. Create a Subject Alternative Name (SAN) CSR with OpenSSL. Create the OpenSSL Private Key and CSR with OpenSSL. Luckily that’s not the case with other Certificate products (like RapidSSL) which already offer this feature built-in. In this tutorial we will learn about SAN certificates and steps to generate CSR for SAN certificates. 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. Create CSR using SHA-1 openssl req -out sha1.csr -new -newkey rsa:2048 -nodes -keyout sha1.key The first screenshot is just an example to understand how companies like Facebook is also using SAN for their certificates. Next, we will generate CSR using private key above AND site-specific copy of OpenSSL config file. Generate a private key and Certificate Signing Request by using the sancert.cnf configuration file. [ alt_names ] … # openssl req -noout -text -in ban21.csr | grep -A 1 "Subject Alternative Name". openssl req -new -key example.com.key -out example.com.csr -config example.com.cnf. 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. After generating a certificate out of it, the certificat doesn't show any of these entries (like in your first screenshot) Now I could have combined the steps to generate private key and CSR for SAN but let's keep it simple. 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. Security, Encryption, Vulnerability Mitigation. 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. 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. When you request a SAN certificate, you have the option of defining multiple DNS names that the certificate can protect. First of all we need a private key. In case the CSR is only available with SHA-1, the CA can be used to sign CSR requests and enforce a different algorithm. If you managed to understand how an SSL certificate works this shouldn’t be a huge problem, anyway just as a recap here’s the list of the meaning for the common Subject entries you’ll need: 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 subjectAltName=. Please note the use of the -sha256 option to enable SHA256 signing instead of the old (and now definitely deprecated SHA1). Reissue your multi-domain SSL/TLS certificate to add subject alternative names (SANs) DigiCert multi-domain certificates come with unlimited reissues. 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. You want to create a Certificate Signing Request (CSR) with the Subject Alternative Name (SAN) extension included in ProxySG or Advanced Secure Gateway (ASG). Creating and signing an SSL cert with alternative names , Signing an existing CSR (no Subject Alternative Names). In the Lab - OpenSSL. 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. 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. 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. Change alt_names appropriately. Please use shortcodes
your code
for syntax highlighting when adding code. Create a configuration file. 1.Login to Linux server where the OpenSSL utility is available. 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The "ye olde way" is how I've typically made a CSR and private key. 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 subjectAltName=. Verify Subject Alternative Name value in CSR. openssl x509 -req \ -sha256 \ -days 3650 \ -in private.csr \ -signkey private.key \ -out private.crt \ -extensions req_ext \ … Enter Name & Description Select DNS with *.aventislab.com – this will be the SAN (Subject Alternative Name) included in our SSL Certificate Change the Key Size to 2048 and Check Make Private Key Exportable Enter C:\temp\aventislab.req to export the CSR File 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. Next we will use openssl to generate our Certificate Signing Request for SAN certificate. Generating CSR file with common name. SAN certificates have gained alot of popularity with major domains across world choose for this option as this saves money because it avoids creating individual certificates for respective domains. Signing a csr with subjectAltName using x509 command. Ah, did not read the link. openssl req -text -noout -in private.csr You should see this: X509v3 Subject Alternative Name: DNS:my-project.site and Signature Algorithm: sha256WithRSAEncryption. So our CSR contains all the IP Address and DNS value which we provided while generating the CSR for SAN. We’re software developers, design thinkers, and security experts. We design and build custom software solutions. In this tutorial I gave you an overview on SAN certificates, and the steps to create Certificate Signing Request for SAN certificates using openssl in Linux. server FQDN or YOUR name) [ req_ext ] subjectAltName = @alt_names [alt_names] … Hi everyone, As most of us know, the Google Chrome Navigator ask about Subject Alternative Name instead the Common Name. For instructions on how to create a CSR, see Create a CSR (Certificate Signing Request). 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. Please note -config switch. Scroll down and look for the X509v3 Subject Alternative Name section. 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: 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. Openssl sign csr with subject alternative name. openssl subject alternative name. Lastly I hope the steps from the article to generate csr for SAN on Linux using openssl was helpful. openssl req -new -key wikiCERT-key.pem -out certificate.csr -config opensslWiki.cnf My Code Certificate Signing Request – CSR generation. 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As Alternative names ( SANs ) DigiCert multi-domain certificates come with unlimited reissues algorithm...