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Prerequisites

• For Austin CA certificates, the computer referenced in the following instructions must have Enroll permissions for the requested certificate template
  • Contact the AD team for assistance with certificate template permissions

Define the certificate subject and subject alternative names

1. Sign in to a computer

...

1. then start

...

1. an administrative PowerShell session 

...

2. Modify then run the following commands to set the subject and template of the certificate as well as any optional DNS or IP Address subject alternate name values:  

   Code Block

...

1. language powershell
   $Subject =

...

1. "<subject for the certificate>"

...

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

...

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

Create the certificate request

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

   Code Block
   language powershell
   $NewLine = [System.Environment]::NewLine

2. Run the following commands to create the temporary files

...

1. : 

   Code Block

...

1. language powershell
   $CertificateTemplateFile = New-TemporaryFile

...

1. $CertificateRequestFile = New-TemporaryFile

2. Run the following commands to

...

1. define the certificate template

...

1. :

...

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

Quick notes on the template contents:

...

1. Code Block
   language powershell
   $CertificateTemplate = @

...

1. ' [Version] Signature=

...

1. "

...

1. $Windows

...

1. NT$" [NewRequest] Subject=

...

1. "CN=

...

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

...

1. "{text}

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1. " _continue_=

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1. "DNS=

...

1. %Subject%&

...

1. "

...

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

...

1. template: 

   Code Block
   language powershell
   ForEach (

...

1. $SubjectAlternateName in

...

1. $SubjectAlternateNames) {

...

...

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

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1. "DNS=

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1. {2}&

...

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

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

...

1. template: 

   Code Block
   language powershell
   ForEach (

...

1. $CertificateIPAddress in

...

1. $CertificateIPAddresses) {

...

...

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

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1. "IPAddress={2}&"' -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

...

1. to review the certificate

...

1. template file: 

   Code Block
   language powershell
   Get-Content

...

1. -Path $CertificateTemplateFile

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

   Code Block
   language powershell
   certreq -new -f

...

1. $CertificateTemplateFile $CertificateRequestFile

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

   Code Block
   language powershell
   Get-Content

...

1. -Path $CertificateRequestFile

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

   Code Block
   language powershell
   Get-Item

...

1. -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 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