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Skip ahead to the Submit the certificate request section for an existing certificate request.

Define the certificate subject and subject alternative names

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1. Sign in to a computer then start an administrative PowerShell

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1. session 

2. Modify then run the following

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1. commands to set the subject

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1. and template of the certificate as well as any optional DNS or IP

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1. Address subject alternate

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1. name values:  

   Code Block

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1. language powershell
   $Subject =

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1. "<subject for the certificate>"

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1. $SubjectAlternateNames = @("<certificate SAN #1>","<certificate SAN #2>",...)

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1. $CertificateIPAddresses = @("<certificate IP address #1>","<certificate IP address #2>",...)

Create the certificate request

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Log into a server joined to the Austin Active Directory as a user with permissions to request a certificate from the desired template

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Start an administrative PowerShell session

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1. Run the following commands to define the newline string: 

   Code Block
   language powershell

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1. $NewLine

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In the same administrative PowerShell prompt, run the following to create the certificate policy file

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1. = [System.Environment]::NewLine

2. Run the following commands to create the temporary files: 

   Code Block
   language powershell
   $CertificateTemplateFile = New-TemporaryFile $CertificateRequestFile = New-TemporaryFile

3. Run the following commands to define the certificate template:

   Code Block
   language powershell
   $CertificateTemplate = @' [Version] Signature=

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1. "

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1. $Windows

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1. NT$" [NewRequest] Subject=

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1. "CN=

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1. %Subject%" Exportable=TRUE MachineKeySet=TRUE KeyLength=2048 KeySpec=AT_KEYEXCHANGE [Extensions] 2.5.29.17=

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1. "{text}

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1. " _continue_=

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1. "DNS=

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1. %Subject%&

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1. "

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1. '@

2. Run the following commands to update the subject in the certificate template: 

   Code Block
   language powershell
   $CertificateTemplate = $CertificateTemplate.Replace('%Subject%', $Subject)

3. Run the following commands to add any optional DNS subject alternate names to the certificate

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1. template: 

   Code Block
   language powershell
   ForEach (

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1. $SubjectAlternateName in

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1. $SubjectAlternateNames) {

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1. $CertificateTemplate = '{0}{1}_continue_=

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1. "DNS=

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1. {2}&

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1. "' -f $CertificateTemplate, $NewLine, $SubjectAlternateName }

2. Run the following commands to add any optional IP Address subject alternate names to the certificate

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1. template: 

   Code Block
   language powershell
   ForEach (

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1. $CertificateIPAddress in

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1. $CertificateIPAddresses) {

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1. $CertificateTemplate = '{0}{1}_continue_=

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1. "IPAddress=

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1. {2}&

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In the same administrative PowerShell prompt, run the following to create the request:

$cert_file_req = ((Get-Location).Path + "\" + $cert_file  + ".req")
certreq -new $cert_file_inf $cert_file_req

Submit the certificate request

1. If submitting a pre-created certificate request, complete the following instructions:
   1. Log into a server joined to the Austin Active Directory as on a system with permissions to request a certificate from the desired template
   2. Start an administrative PowerShell session and set the $cert_file_req object to the full path of the certificate request file

2. In the same administrative PowerShell session, run one of the following to set the certificate template:

   • For VMware SSL certificates, run the following: 

     Code Block
     $cert_template = "VMwareSSL6.5"

   • For long-duration server certificates, run the following: 

     Code Block
     $cert_template = "Server-10Year"

3. In the same administrative PowerShell session, run the following to define where the signed certificate file will be created using the certificate request file

   Code Block
   $cert_file_cer = (Get-Item $cert_file_req).DirectoryName + "\" + (Get-Item $cert_file_req).BaseName + ".cer"

4. In the same administrative PowerShell session, run the following to submit the request to an Austin certificate authority:

   Code Block
   certreq -submit -attrib ("CertificateTemplate:" + $cert_template) $cert_file_req $cert_file_cer

Accept the certificate request

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1. Log into the system that created the original certificate request
2. Start an administrative PowerShell session and set the $cert_file_cer object to the full path of the signed certificate file that will be accepted

In the same administrative PowerShell prompt, run the following to accept the response: 

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1. "' -f $CertificateTemplate, $NewLine, $CertificateIPAddress }

2. Run the following commands to trim the certificate template:

   Code Block
   language powershell
   $CertificateTemplate = $CertificateTemplate -replace '&"\s*$', '"'

3. Run the following commands to write the certificate template file:

   Code Block
   language powershell
   $Content | Out-File -FilePath $CertificateTemplateFile -Force

4. Run the following commands to review the certificate template file: 

   Code Block
   language powershell
   Get-Content -Path $CertificateTemplateFile

5. Run the following commands to create the certificate request file:

   Code Block
   language powershell
   certreq -new -f $CertificateTemplateFile $CertificateRequestFile

6. Run the following commands to review the certificate request file: 

   Code Block
   language powershell
   Get-Content -Path $CertificateRequestFile

7. Run the following commands to retrieve the certificate request file name: 

   Code Block
   language powershell
   Get-Item -Path $CertificateRequestFile

Submit the certificate request to a certificate authority

• To submit the certificate request to the preferred InCommon certificate authority, review and complete the SSL Request form in ServiceNow 

• To submit the certificate request to the internal Austin certificate authority, complete the instructions on the following page: Austin Certificates - How-To - Submit custom certificates requests

References

• Certreq - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/certreq_1