Export Azure SSL certificate as pfx file

Question

I purchased a wild card certificate from azure. It sits right now in the Key Vault. I need to upload it to our other server which hosts one of our other applications for the same domain. There is no option to export the certificate as a .pfx file anywhere in azure portal.

Please help.

Answer 1

You can create a local PFX copy of Azure App Service Certificate using PowerShell.

Provide appropriate values from the following variables and save the script as copyasc.ps1.

Variables:

$appServiceCertificateName = "ascdemo"
$resourceGroupName = "ascdemorg"
$azureLoginEmailId = "user@microsoft.com"
$subscriptionId = "fb2c25dc-6bab-45c4-8cc9-cece7c42a95a"

copyasc.ps1:

$appServiceCertificateName = ""
$resourceGroupName = ""
$azureLoginEmailId = ""
$subscriptionId = ""

Login-AzureRmAccount
Set-AzureRmContext -SubscriptionId $subscriptionId

$ascResource = Get-AzureRmResource -ResourceName $appServiceCertificateName -ResourceGroupName $resourceGroupName -ResourceType "Microsoft.CertificateRegistration/certificateOrders" -ApiVersion "2015-08-01"
$keyVaultId = ""
$keyVaultSecretName = ""

$certificateProperties=Get-Member -InputObject $ascResource.Properties.certificates[0] -MemberType NoteProperty
$certificateName = $certificateProperties[0].Name
$keyVaultId = $ascResource.Properties.certificates[0].$certificateName.KeyVaultId
$keyVaultSecretName = $ascResource.Properties.certificates[0].$certificateName.KeyVaultSecretName

$keyVaultIdParts = $keyVaultId.Split("/")
$keyVaultName = $keyVaultIdParts[$keyVaultIdParts.Length - 1]
$keyVaultResourceGroupName = $keyVaultIdParts[$keyVaultIdParts.Length - 5]
Set-AzureRmKeyVaultAccessPolicy -ResourceGroupName $keyVaultResourceGroupName -VaultName $keyVaultName -UserPrincipalName $azureLoginEmailId -PermissionsToSecrets get
$secret = Get-AzureKeyVaultSecret -VaultName $keyVaultName -Name $keyVaultSecretName
$pfxCertObject=New-Object System.Security.Cryptography.X509Certificates.X509Certificate2 -ArgumentList @([Convert]::FromBase64String($secret.SecretValueText),"", [System.Security.Cryptography.X509Certificates.X509KeyStorageFlags]::Exportable)
$pfxPassword = -join ((65..90) + (97..122) + (48..57) | Get-Random -Count 50 | % {[char]$_})
$currentDirectory = (Get-Location -PSProvider FileSystem).ProviderPath
[Environment]::CurrentDirectory = (Get-Location -PSProvider FileSystem).ProviderPath
[io.file]::WriteAllBytes(".\appservicecertificate.pfx", $pfxCertObject.Export([System.Security.Cryptography.X509Certificates.X509ContentType]::Pkcs12, $pfxPassword))
Write-Host "Created an App Service Certificate copy at: $currentDirectory\appservicecertificate.pfx"
Write-Warning "For security reasons, do not store the PFX password. Use it directly from the console as required."
Write-Host "PFX password: $pfxPassword"

Type the following commands in PowerShell console to execute the script:

Powershell –ExecutionPolicy Bypass
.\copyasc.ps1

You can find more details on Azure App Service Team Blog Creating a local PFX copy of App Service Certificate

If you have an App Service Certificate that you would like to use outside of Azure App Service ecosystem, then give this a try and let us know how it goes. If you run into any issues, please let us know on the Stackoverflow or on the Azure App Service forum.

Answer 2

I've found @dmitry-kazakov's answer to be helpful, but had to perform some minor updates to get it to work for me.

First I had to execute this command and assign it to $azureUserPrincipalName:

PS Azure:\> Get-Azureaduser

ObjectId                             DisplayName UserPrincipalName                                             UserType
--------                             ----------- -----------------                                             --------
89500455-0019-4059-8ef8-f1w32993z520 A User rmoore_roundlabinc.com#EXT#@rmooreroundlabinc.onmicrosoft.com Member

Then here is the updated script:

$appServiceCertificateName = "ascdemo" #This is the "Subject Name" in Azure, not "Name"
$resourceGroupName = "ascdemorg"
$azureLoginEmailId = "user@microsoft.com"
$subscriptionId = "fb2c25dc-6bab-45c4-8cc9-cece7c42a95a"
$azureUserPrincipalName = "user@microsoft.com#EXT#@user@microsoft.com.onmicrosoft.com"

Login-AzureRmAccount
Set-AzureRmContext -SubscriptionId $subscriptionId

$ascResource= Get-AzureRmResource -ResourceName $appServiceCertificateName -ResourceGroupName $resourceGroupName -ResourceType "Microsoft.CertificateRegistration/certificateOrders" -ApiVersion "2019-05-01"
$keyVaultId = ""
$keyVaultSecretName = ""

$certificateProperties=Get-Member -InputObject $ascResource.Properties.certificates[0] -MemberType NoteProperty
$certificateName = $certificateProperties[0].Name
$keyVaultId = $ascResource.Properties.certificates[0].$certificateName.KeyVaultId
$keyVaultSecretName = $ascResource.Properties.certificates[0].$certificateName.KeyVaultSecretName

$keyVaultIdParts = $keyVaultId.Split("/")
$keyVaultName = $keyVaultIdParts[$keyVaultIdParts.Length - 1]
$keyVaultResourceGroupName = $keyVaultIdParts[$keyVaultIdParts.Length - 5]
Set-AzureRmKeyVaultAccessPolicy -ResourceGroupName $keyVaultResourceGroupName -VaultName $keyVaultName -UserPrincipalName $azureUserPrincipalName -PermissionsToSecrets get
$secret = Get-AzureKeyVaultSecret -VaultName $keyVaultName -Name $keyVaultSecretName
$pfxCertObject=New-Object System.Security.Cryptography.X509Certificates.X509Certificate2 -ArgumentList @([Convert]::FromBase64String($secret.SecretValueText),"", [System.Security.Cryptography.X509Certificates.X509KeyStorageFlags]::Exportable)
$pfxPassword = -join ((65..90) + (97..122) + (48..57) | Get-Random -Count 50 | % {[char]$_})
$currentDirectory = (Get-Location -PSProvider FileSystem).ProviderPath
[Environment]::CurrentDirectory = (Get-Location -PSProvider FileSystem).ProviderPath
[io.file]::WriteAllBytes(".\appservicecertificate.pfx", $pfxCertObject.Export([System.Security.Cryptography.X509Certificates.X509ContentType]::Pkcs12, $pfxPassword))
Write-Host "Created an App Service Certificate copy at: $currentDirectory\appservicecertificate.pfx"
Write-Warning "For security reasons, do not store the PFX password. Use it directly from the console as required."
Write-Host "PFX password: $pfxPassword"

Powershell –ExecutionPolicy Bypass
.\copyasc.ps1