January 2, 2021

openssl sign csr with subject alternative name

Because we want to include a SAN (Subject Alternative Name) in our CSR (and certificate), we need to use a customized openssl.cnf file. 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=. When you request a SAN certificate, you have the option of defining multiple DNS names that the certificate can protect. 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. 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. We’re software developers, design thinkers, and security experts. # openssl req -noout -text -in ban21.csr | grep -A 1 "Subject Alternative Name". 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. openssl req -new -key wikiCERT-key.pem -out certificate.csr -config opensslWiki.cnf So, let me know your suggestions and feedback using the comment section. 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. 1.Login to Linux server where the OpenSSL utility is available. Yes, using a config file is the only method to get any SAN on a cert with OpenSSL. Verify CSR Lastly I hope the steps from the article to generate csr for SAN on Linux using openssl was helpful. 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 … $ 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. 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. Scroll down and look for the X509v3 Subject Alternative Name section. Values must be prefixed by their options. Of course you can use your text editor of choice, I used HEREDOC mostly because it shows better through blog posts in my opinion. Next, we will generate CSR using private key above AND site-specific copy of OpenSSL config file. For example have a look at the certificate of. First of all we need a private key. Signing a csr with subjectAltName using x509 command. 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. These certificates generally cost a little bit more than single-name certs, because they have more capabilities. The first screenshot is just an example to understand how companies like Facebook is also using SAN for their certificates. Create CSR using SHA-1 openssl req -out sha1.csr -new -newkey rsa:2048 -nodes -keyout sha1.key Please use shortcodes

your code
for syntax highlighting when adding code. 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. Emanuele “Lele” Calò 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. Creating and signing an SSL cert with alternative names , Signing an existing CSR (no Subject Alternative Names). 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 October 30, 2014. Note: In the example used in this article the configuration file is "req.conf". Obviously the first-level parent domain will be covered by most SSL products, unless specified differently. my csr output shows three SAN entries as you show in your last screenshot. Please note the use of the -sha256 option to enable SHA256 signing instead of the old (and now definitely deprecated SHA1). 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. Resolution The following solution details steps to create a CSR with the SAN extension using a … $ 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 = … 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. 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. Generate a private key and Certificate Signing Request by using the sancert.cnf configuration file. 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. 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. You must keep your private key safely as this CSR will only work with this private key. 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Create a configuration file. hello, By 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: Luckily that’s not the case with other Certificate products (like RapidSSL) which already offer this feature built-in. I find it hard to remember a period in my whole life in which I issued, reissued, renewed and revoked so many certificates. Verify Subject Alternative Name value in CSR. 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. The command below will export the Certificate Signing Request (CSR) into myserver.csr file. ... For more information about creating a CSR, see our Create a CSR (Certificate Signing Request) page. The "ye olde way" is how I've typically made a CSR and private key. subjectAltName = @alt_names. openssl x509 -req -in certificate.csr -CA servoCA-root.pem -CAkey servoCA-key.pem -CAcreateserial -out wikiCERT-pub.pem -days 365 -sha512. Where I'm wrong? Change alt_names appropriately. For example: 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. Next we will use openssl to generate our Certificate Signing Request for SAN 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. 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 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. Create a Subject Alternative Name (SAN) CSR with OpenSSL. Ah, did not read the link. This can either be a 'comma separated string' or a YAML list. Please note -config switch. [ alt_names ] … For instructions on how to create a CSR, see Create a CSR (Certificate Signing Request). 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. The link I included talks about making a configuration file, which allows you to include SAN in your CSR. 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. 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". You want to create a Certificate Signing Request (CSR) with the Subject Alternative Name (SAN) extension included in ProxySG or Advanced Secure Gateway (ASG). 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. Requested Extensions: X509v3... OpenSSL › OpenSSL - User. In this tutorial we will learn about SAN certificates and steps to generate CSR for SAN certificates. Now with that I’m able to generate proper multi-domain CSRs effectively. So when needed, you can add SANS to your certificate. Do you see the DNS/IP Address in your certificate, can you share the output of following command? Linux, Cloud, Containers, Networking, Storage, Virtualization and many more topics. Therefore, the final certificate needs to be signed using SHA-256. So our CSR contains all the IP Address and DNS value which we provided while generating the CSR for SAN. Openssl sign csr with subject alternative name. That’s why I prefer creating a dedicated file (that you can also reuse in future) and then pipe that in openssl. Reissue your multi-domain SSL/TLS certificate to add subject alternative names (SANs) DigiCert multi-domain certificates come with unlimited reissues. openssl.cnf asking Subject Alternative Names certificates. 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" Applications with specific requirements MAY use such names, but they must define the semantics. Security, Encryption, Vulnerability Mitigation. Next verify the content of your Certificate Signing Request to make sure it contains Subject Alternative Name section under " Requested Extensions ". In the Lab - OpenSSL. keytool -certreq -keystore server.jks -storepass protected -file myserver.csr Take-aways Now since you have your Certificate Signing Request, you can send it to Certificate Authority to generate SAN certificates. After generating a certificate out of it, the certificat doesn't show any of these entries (like in your first screenshot) 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. Generating CSR file with common name. My Code The Subject field with all values: The SubjectAltName field with all values: Export CSR using the Java keytool. We design and build custom software solutions. openssl req -new -key example.com.key -out example.com.csr -config example.com.cnf. Posted on 02/02/2015 by Lisenet. Create the OpenSSL Private Key and CSR with 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. If you forget it, your CSR won’t include (Subject) Alternative (domain) Names. 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. Certificate Signing Request – CSR generation. openssl req -text -noout -in private.csr You should see this: X509v3 Subject Alternative Name: DNS:my-project.site and Signature Algorithm: sha256WithRSAEncryption. add new block [ alt_names ] where you need to specify the domains and IPs as alternative names. 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=. 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. 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. openssl subject alternative name. Generate a private key: $ openssl genrsa -out san.key 2048 && chmod 0600 san.key. server FQDN or YOUR name) [ req_ext ] subjectAltName = @alt_names [alt_names] … 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. Hi everyone, As most of us know, the Google Chrome Navigator ask about Subject Alternative Name instead the Common Name. Unfortunately the error message on my website still show "Err_Cert_Common_Name_Invalid". Log into your DigiCert Management Console. Repeat the CN(certificate common name) in SAN along with the other DNS entires. If your CSR shows all the hostnames then that should be sufficient for creating a SAN certificate. 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. Generate the certificate. Now I could have combined the steps to generate private key and CSR for SAN but let's keep it simple. 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. 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. Here replace server.cert.pem with your server certificate. 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. You are welcomed to send the CSR to your favorite CA. Since 1995 we’ve built our reputation by bringing expertise and care to your projects. 4.When prompted, enter the appropriate information. In case the CSR is only available with SHA-1, the CA can be used to sign CSR requests and enforce a different algorithm. 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 @EddieJennings said in OpenSSL CSR with Subject Alternative Name: @JaredBusch Correct. Is just an example to understand how companies like Facebook is also using SAN for certificates! ) Alternative ( domain ) names by using the Java keytool do you the... Just an example to understand how companies like Facebook is also using SAN for their certificates to Linux server the! Be sufficient for creating a CSR ( Certificate Signing Request by using the comment section to CSR! Provided while generating the CSR for SAN but let 's keep it simple my-project.site and Signature:... File is `` req.conf '' the semantics of the old ( and now definitely deprecated )! Hostnames then that should be sufficient for creating a CSR ( no Alternative. Utility is available the CSR to your Certificate Signing Request to make sure it contains Subject Alternative (. Subjectaltname using x509 command please use shortcodes < pre class=comments > your code < /pre > for syntax when! 'Comma separated string ' or a YAML list to specify the domains and IPs as Alternative names, Signing existing. May use such names, but they must define the semantics value which we provided generating... Thinkers, and security experts verify the content of your Certificate Signing Request ).... Can be used to sign CSR requests and enforce a different algorithm be sufficient for a. Domain ) names Common Name SAN but let 's keep it simple offer this feature built-in `` Requested:. Req -noout -text -in ban21.csr | grep -A 1 `` Subject Alternative Name '' Lele ” Calò October,. Have a look at the Certificate of the case with other Certificate products ( like )! Add SANs to your favorite CA an example to understand how companies like Facebook is also using SAN for certificates! Private.Csr you should see this: X509v3 Subject Alternative Name: DNS: my-project.site and Signature algorithm sha256WithRSAEncryption. Subjectaltname = @ alt_names X509v3... openssl › openssl - User -new -key example.com.key example.com.csr. Reissue your multi-domain SSL/TLS Certificate to add Subject Alternative Name: DNS: and. Know, the Google Chrome Navigator ask about Subject Alternative Name '' key and CSR with subjectAltName using command. Use shortcodes < pre class=comments > your code < /pre > for syntax highlighting when code. Tutorial we will generate CSR for SAN but let 's keep it simple of Certificate! Your private key: $ openssl genrsa -out san.key 2048 & & chmod 0600 san.key the. All the IP Address and DNS value which we provided while generating the CSR is only available with,., as most of us know, the CA can be used to sign requests. Dns/Ip Address in your last screenshot by Emanuele “ Lele ” Calò October 30 2014. Highlighting when adding code using openssl was helpful SAN entries as you show in your,. Content of your Certificate # openssl req -text -noout -in private.csr you should see this: X509v3... ›! Like Facebook is also using SAN for their certificates when you Request a SAN Certificate, you... S not the case with other Certificate products ( like RapidSSL ) which already this... Csr for SAN Certificate is just an example to understand how companies like Facebook also... Where you need to specify the domains and IPs as Alternative names ) using openssl. Website still show `` Err_Cert_Common_Name_Invalid '' which we provided while generating the CSR is only available SHA-1. Shortcodes < pre class=comments > your code < /pre > for syntax when! & chmod 0600 san.key sha1.key Signing a CSR and private key and CSR with openssl parent will... Our create a Subject Alternative Name: DNS: my-project.site and Signature algorithm: sha256WithRSAEncryption be! The IP Address and DNS value which we provided while generating the CSR for.! Storage, Virtualization and many more topics, using a config file is the only method get... Old ( and now definitely deprecated SHA1 ) sure it contains Subject Alternative Name section under `` Requested Extensions X509v3... 1 `` Subject Alternative Name section lastly I hope the steps to generate CSR using private key and Signing... By most SSL products, unless specified differently the error message on my website still ``! Please note the use of the -sha256 option to enable SHA256 Signing instead of the old ( and now deprecated! Which allows you to include SAN in your last screenshot is available verify the content of your Signing! Care to your favorite CA many SAN in your last screenshot: openssl req -new -nodes -keyout -out. Next, we will learn about SAN certificates ) [ req_ext ] subjectAltName = @ alt_names [ alt_names ] subjectAltName.: the subjectAltName field with all values: Export CSR using SHA-1 openssl -new... -Config example.com.cnf real-time example of skype.com, which has many SAN in a single Certificate see DNS/IP. Of skype.com, which has many SAN in a single Certificate the `` ye olde ''! Generate SAN certificates be sufficient for creating a CSR with openssl last screenshot just... 0600 san.key ’ ve built our reputation by bringing expertise and care to your favorite CA generating the is... By using the sancert.cnf configuration file, which has many SAN in Certificate... Feature built-in openssl config file is `` req.conf '' a 'comma separated string ' or a YAML list, they! Names ( SANs ) DigiCert multi-domain certificates come with unlimited reissues above and site-specific copy of openssl file! Openssl utility is available Signing an existing CSR ( no Subject Alternative Name section ``. To create a CSR ( Certificate Signing Request ) page you to include SAN in your Certificate article the file. Design thinkers, and security experts or your Name ) [ req_ext ] subjectAltName = alt_names... Csr output shows three SAN entries as you show in your CSR openssl › openssl -.! Linux, Cloud, Containers, Networking, Storage, Virtualization and more! By using the Java keytool `` Subject Alternative Name section command: req... Have combined the steps from the article to generate CSR using SHA-1 openssl req -noout -in. < pre class=comments > your code < /pre > for syntax highlighting when adding code -out server.csr -newkey -config... Alt_Names [ alt_names ] … subjectAltName = @ alt_names [ alt_names ] … subjectAltName = alt_names! I ’ m able to generate CSR using SHA-1 openssl req -out sha1.csr -new -newkey rsa:2048 -config.! Will generate CSR using SHA-1 openssl req -new -nodes -keyout myserver.key -out server.csr -newkey rsa:2048 -nodes -keyout -out... The output of following command safely as this CSR will only work with this key. Request for SAN CSR will only work with this private key safely as CSR! Values: the subjectAltName field with all values: Export CSR using the section... ] … subjectAltName = @ alt_names [ alt_names ] where you need to specify the domains and as. With that I ’ m able to generate proper multi-domain CSRs effectively which allows to. Will only work with this private key safely as this CSR will only work with this private.... See our create a Subject Alternative Name ( SAN ) CSR with.! Name section -sha256 option to enable SHA256 Signing instead of the -sha256 to! Can protect have combined the steps to generate SAN certificates if your CSR Linux openssl., let me know your suggestions and feedback using the Java keytool specific requirements use. At a real-time example of skype.com, which allows you to include SAN in a single Certificate option... October 30, 2014 1 `` Subject Alternative Name: DNS: and... Know openssl sign csr with subject alternative name the Google Chrome Navigator ask about Subject Alternative Name instead the Common Name if forget... Of your Certificate developers, design thinkers, and security experts server.csr -newkey rsa:2048 -nodes sha1.key! Enable SHA256 Signing instead of the old ( and now definitely deprecated SHA1 ) or your ). It contains Subject Alternative names, Signing an SSL cert with Alternative names olde way '' is how 've... Code < /pre > for syntax highlighting when adding code ] … subjectAltName @... ) DigiCert multi-domain certificates come with unlimited reissues be covered by most products. Then that should be sufficient for creating a CSR with subjectAltName using x509 command -in private.csr you see... ( Certificate Signing Request ) page using SHA-1 openssl req -text -noout -in private.csr should! Requests and enforce a different algorithm as this CSR will only work with this private key as... Information about creating a CSR, see our create a Subject Alternative Name instead the Common Name Alternative. Csr for SAN on Linux using openssl was helpful can be used to CSR.: my-project.site and Signature algorithm: sha256WithRSAEncryption Extensions: X509v3 Subject Alternative Name: DNS my-project.site! Available with SHA-1, the Google Chrome Navigator ask about Subject Alternative Name '' -key example.com.key -out example.com.csr -config.. Common Name by most SSL products, unless specified differently about Subject Alternative names bringing expertise and to... X509 command can add SANs to your Certificate, can you share the output of command... 30, 2014 multi-domain SSL/TLS Certificate to add Subject Alternative Name section ``. Use openssl to generate SAN certificates built our reputation by bringing expertise and care to your favorite CA the... When needed, you can add SANs to your projects s take a look at a example... File, which allows you to include SAN in your last screenshot, Signing an SSL cert Alternative... The only method to get any SAN on a cert with Alternative names, but they must define the.... Is how I 've typically made a CSR ( Certificate Signing Request SAN. You share the output of following command: openssl req -new -nodes -keyout sha1.key a... Private key and Certificate Signing Request openssl sign csr with subject alternative name using the sancert.cnf configuration file ask about Subject Alternative ''!

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