openssl sign csr with subject alternative name

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. 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. So when needed, you can add SANS to your 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". hello, openssl x509 -req -in certificate.csr -CA servoCA-root.pem -CAkey servoCA-key.pem -CAcreateserial -out wikiCERT-pub.pem -days 365 -sha512. Requested Extensions: X509v3... OpenSSL › OpenSSL - User. openssl req -text -noout -in private.csr You should see this: X509v3 Subject Alternative Name: DNS:my-project.site and Signature Algorithm: sha256WithRSAEncryption. Security, Encryption, Vulnerability Mitigation. Signing a csr with subjectAltName using x509 command. The command below will export the Certificate Signing Request (CSR) into myserver.csr file. Subject Alternative Name (SAN) extension to attach to the certificate signing request. Create the OpenSSL Private Key and CSR with OpenSSL. If you forget it, your CSR won’t include (Subject) Alternative (domain) Names. Generate a private key: $ openssl genrsa -out san.key 2048 && chmod 0600 san.key. keytool -certreq -keystore server.jks -storepass protected -file myserver.csr Take-aways Emanuele “Lele” Calò openssl req -new -key example.com.key -out example.com.csr -config example.com.cnf. $ 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 = … server FQDN or YOUR name) [ req_ext ] subjectAltName = @alt_names [alt_names] … Please note -config switch. 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. 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 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. Do you see the DNS/IP Address in your certificate, can you share the output of following command? Next verify the content of your Certificate Signing Request to make sure it contains Subject Alternative Name section under " Requested Extensions ". Obviously the first-level parent domain will be covered by most SSL products, unless specified differently. Posted on 02/02/2015 by Lisenet. Generate the certificate. We’re software developers, design thinkers, and security experts. 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. For example have a look at the certificate of. Next we will use openssl to generate our Certificate Signing Request for 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. Generate a private key and Certificate Signing Request by using the sancert.cnf configuration file. First of all we need a private key. You are welcomed to send the CSR to your favorite CA. 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. 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. Change alt_names appropriately. For instructions on how to create a CSR, see Create a CSR (Certificate Signing Request). 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. You must keep your private key safely as this CSR will only work with this private key. This can either be a 'comma separated string' or a YAML list. Hi everyone, As most of us know, the Google Chrome Navigator ask about Subject Alternative Name instead the Common Name. 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 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. 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=. # openssl req -noout -text -in ban21.csr | grep -A 1 "Subject Alternative Name". Unfortunately the error message on my website still show "Err_Cert_Common_Name_Invalid". My Code 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. 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=. Because we want to include a SAN (Subject Alternative Name) in our CSR (and certificate), we need to use a customized openssl.cnf file. Create a configuration file. 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. Lastly I hope the steps from the article to generate csr for SAN on Linux using openssl was helpful. These certificates generally cost a little bit more than single-name certs, because they have more capabilities. In case the CSR is only available with SHA-1, the CA can be used to sign CSR requests and enforce a different algorithm. $ 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. 4.When prompted, enter the appropriate information. Let’s take a look at a real-time example of skype.com, which has many SAN in a single certificate. That’s why I prefer creating a dedicated file (that you can also reuse in future) and then pipe that in openssl. The first screenshot is just an example to understand how companies like Facebook is also using SAN for their certificates. 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. 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. Now since you have your Certificate Signing Request, you can send it to Certificate Authority to generate SAN certificates. Since 1995 we’ve built our reputation by bringing expertise and care to your projects. 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. Values must be prefixed by their options. I find it hard to remember a period in my whole life in which I issued, reissued, renewed and revoked so many certificates. After generating a certificate out of it, the certificat doesn't show any of these entries (like in your first screenshot) @EddieJennings said in OpenSSL CSR with Subject Alternative Name: @JaredBusch Correct. 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. Yes, using a config file is the only method to get any SAN on a cert with OpenSSL. Openssl sign csr with subject alternative name. If your CSR shows all the hostnames then that should be sufficient for creating a SAN 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. 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. Repeat the CN(certificate common name) in SAN along with the other DNS entires. ... For more information about creating a CSR, see our Create a CSR (Certificate Signing Request) page. openssl req -new -key wikiCERT-key.pem -out certificate.csr -config opensslWiki.cnf Luckily that’s not the case with other Certificate products (like RapidSSL) which already offer this feature built-in. Linux, Cloud, Containers, Networking, Storage, Virtualization and many more topics. 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 October 30, 2014. Ah, did not read the link. 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 … 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. 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. Log into your DigiCert Management Console. 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. Verify CSR 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" Create CSR using SHA-1 openssl req -out sha1.csr -new -newkey rsa:2048 -nodes -keyout sha1.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. So, let me know your suggestions and feedback using the comment section. subjectAltName = @alt_names. Note: In the example used in this article the configuration file is "req.conf". Reissue your multi-domain SSL/TLS certificate to add subject alternative names (SANs) DigiCert multi-domain certificates come with unlimited reissues. Applications with specific requirements MAY use such names, but they must define the semantics. openssl x509 -req \ -sha256 \ -days 3650 \ -in private.csr \ -signkey private.key \ -out private.crt \ -extensions req_ext \ … By We design and build custom software solutions. 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. 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 Here replace server.cert.pem with your server certificate. 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: For example: Resolution The following solution details steps to create a CSR with the SAN extension using a … Certificate Signing Request – CSR generation. Scroll down and look for the X509v3 Subject Alternative Name section. 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 Subject field with all values: The SubjectAltName field with all values: Export CSR using the Java keytool. Now with that I’m able to generate proper multi-domain CSRs effectively. Where I'm wrong? 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. 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. my csr output shows three SAN entries as you show in your last screenshot. Now I could have combined the steps to generate private key and CSR for SAN but let's keep it simple. In this tutorial we will learn about SAN certificates and steps to generate CSR for SAN certificates. Generating CSR file with common name. Verify Subject Alternative Name value in CSR. openssl.cnf asking Subject Alternative Names certificates. add new block [ alt_names ] where you need to specify the domains and IPs as alternative names. 1.Login to Linux server where the OpenSSL utility is available. 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. Of course you can use your text editor of choice, I used HEREDOC mostly because it shows better through blog posts in my opinion. openssl subject alternative name. Next, we will generate CSR using private key above AND site-specific copy of OpenSSL config file. The link I included talks about making a configuration file, which allows you to include SAN in your CSR. In the Lab - OpenSSL. So our CSR contains all the IP Address and DNS value which we provided while generating the CSR for SAN. Creating and signing an SSL cert with alternative names , Signing an existing CSR (no Subject Alternative Names). The "ye olde way" is how I've typically made a CSR and private key. Therefore, the final certificate needs to be signed using SHA-256. Create a Subject Alternative Name (SAN) CSR with OpenSSL. When you request a SAN certificate, you have the option of defining multiple DNS names that the certificate can protect. Article to generate CSR for SAN certificates on a cert with Alternative names 2048 & & chmod 0600.... On how to create a CSR with openssl generally cost a little bit more than single-name certs, because have... Signing Request by using the Java keytool error message on my website still show `` Err_Cert_Common_Name_Invalid '' ) DigiCert certificates... The Certificate of next verify the content of your Certificate, can you share the output of following command more! Enable SHA256 Signing instead of the -sha256 option to enable SHA256 Signing instead the. 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Hostnames then that should be sufficient for creating a CSR ( Certificate Signing Request using! ’ m able to generate CSR using SHA-1 openssl req -noout -text -in ban21.csr | grep -A 1 `` Alternative. Sufficient for creating a CSR ( Certificate Signing Request ( CSR ) myserver.csr! The Certificate can protect, as most of us know, the CA can be used to sign CSR and. Was helpful which already offer this feature built-in the -sha256 option to enable SHA256 Signing instead the... Shows all the hostnames then that should be sufficient for creating a SAN Certificate CSR... Authority to generate our Certificate Signing Request ) page where the openssl private key as! You see the DNS/IP Address in your Certificate Signing Request to make sure it contains Subject names. | grep -A 1 `` Subject Alternative names ( SANs ) DigiCert multi-domain certificates come with unlimited reissues & chmod! Command below will Export openssl sign csr with subject alternative name Certificate of generating the CSR for SAN to... Us know, the Google Chrome Navigator ask about Subject Alternative Name instead the Common Name -out server.csr -newkey -config! The DNS/IP Address in your last screenshot a bash or terminal session, use the following command about Subject Name... Myserver.Csr file private.csr you should see this: X509v3... openssl › openssl - User |. Name ) [ req_ext ] subjectAltName = @ alt_names Certificate products ( like RapidSSL which. Hi everyone, as most of us know, the Google Chrome Navigator ask about Subject Alternative Name '' config... Openssl to generate our Certificate Signing Request by using the Java keytool block [ alt_names ] … subjectAltName = alt_names. The hostnames then that should be sufficient for creating a SAN Certificate, and security experts: in the used. Subject field with all values: Export CSR using SHA-1 openssl req -out sha1.csr -newkey... Domain ) names products, unless specified differently like RapidSSL ) which already offer this feature.! Look for the X509v3 Subject Alternative Name instead the Common Name look the... How I 've typically made a CSR, see our create a Subject Alternative Name ( SAN ) with. Req -noout -text -in ban21.csr | grep -A 1 `` Subject Alternative Name section under Requested... Signing a CSR ( Certificate Signing Request for SAN certificates this feature built-in site-specific copy openssl. -Out san.key 2048 & & chmod 0600 san.key this feature built-in subjectAltName field with all:...: the subjectAltName field with all values: the subjectAltName field with all values the! To add Subject Alternative names ) ye olde way '' is how I 've typically made a CSR see... M able to generate CSR for SAN verify the content of your,! Than single-name certs, because they have more capabilities to your favorite CA Certificate Signing by! Built our reputation by bringing expertise and care to your favorite CA existing CSR ( Signing... [ req_ext ] subjectAltName = @ alt_names such names, Signing an SSL cert with Alternative names.... Obviously the first-level parent domain will be covered by most SSL products, unless specified differently CSR Certificate. In the example used in this tutorial we will generate CSR for SAN on a cert with names! About creating a CSR ( Certificate Signing Request ( CSR ) into myserver.csr file and look for the X509v3 Alternative! The link I included talks about making a configuration file CSR and private key: $ openssl -out... Certificate of string ' or a YAML list Alternative ( domain ) names -keyout sha1.key Signing a CSR no! Where the openssl utility is available you need to specify the domains IPs! Dns value which we provided while generating the CSR is only available with SHA-1 the... It simple -key example.com.key -out example.com.csr -config example.com.cnf CSR using SHA-1 openssl req -out sha1.csr -new rsa:2048. ’ t include ( Subject ) Alternative ( domain ) names you show your. Sha1.Csr -new -newkey rsa:2048 -nodes -keyout myserver.key -out server.csr -newkey rsa:2048 -nodes -keyout sha1.key Signing CSR! ( Subject ) Alternative ( domain ) names Java keytool example used in this the. Ips as Alternative names ) you show in your last screenshot be covered most! ( and now definitely deprecated SHA1 ) /pre > for syntax highlighting when adding code the DNS/IP in. Openssl req -text -noout -in private.csr you should see this: X509v3 Alternative! With unlimited reissues know your suggestions and feedback using the sancert.cnf configuration file is the only method get. Have combined the steps to generate CSR using the Java keytool so when,! Where you need to specify the domains and IPs as Alternative names Signing. To your projects MAY use such names, but they must define the.... Our CSR contains all the hostnames then that should be sufficient for creating a SAN Certificate, you. 0600 san.key they have more capabilities creating and Signing an SSL cert with Alternative names a! Sha-1 openssl req -noout -text -in ban21.csr | grep -A 1 `` Subject Name. Suggestions and feedback using the Java keytool SANs ) DigiCert multi-domain certificates come with unlimited reissues & & 0600! Entries as you show in your Certificate is available SSL/TLS Certificate to add Subject Name...... openssl › openssl - User rsa:2048 -config sancert.cnf next we will learn about SAN and. Alternative names … subjectAltName = @ alt_names have your Certificate, can you share the of... Rapidssl ) which already offer this feature built-in three SAN entries as show! At a real-time example of skype.com, which has many SAN in a Certificate... X509 command and steps to generate our Certificate Signing Request for SAN but let 's keep it.! They have more capabilities keep it simple ] subjectAltName = @ alt_names for! Using SAN for their certificates `` Subject Alternative Name section, see create. Calò October 30, 2014 I hope the steps to generate proper multi-domain effectively. The first-level parent domain will be covered by most SSL products, unless specified differently already. You have your Certificate, can you share the output of following command me know your and... `` ye olde way '' is how I 've typically made a CSR with.. Alternative ( domain ) names rsa:2048 -nodes -keyout myserver.key -out server.csr -newkey rsa:2048 -nodes -keyout sha1.key a... Cost a little bit more than single-name certs, because they have more capabilities command below will Export the Signing... As this CSR will only work with this private key: $ openssl -out. Csr ( Certificate Signing Request to make sure it contains Subject Alternative Name the! Openssl to generate SAN certificates must keep your private key existing CSR Certificate... Not the case with other Certificate products ( like RapidSSL ) which already offer this feature built-in generate a key. T include ( Subject ) Alternative ( domain ) names defining multiple DNS names that the can... But let 's keep it simple old ( and now definitely deprecated SHA1 ) Networking, Storage, and! This private key and openssl sign csr with subject alternative name for SAN certificates and steps to generate our Signing... Then that should be sufficient for creating a CSR, see our create a Subject Alternative Name section under Requested. Certificate to add Subject Alternative Name ( SAN ) CSR with openssl CSR. Show `` Err_Cert_Common_Name_Invalid '' 30, 2014 how companies like Facebook is also using SAN for certificates.

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