Configure TLS termination with Key Vault certificates using Azure PowerShell

Article
05/11/2023

Azure Key Vault is a platform-managed secret store that you can use to safeguard secrets, keys, and TLS/SSL certificates. Azure Application Gateway supports integration with Key Vault for server certificates that are attached to HTTPS-enabled listeners. This support is limited to the Application Gateway v2 SKU.

For more information, see TLS termination with Key Vault certificates.

This article shows you how to use an Azure PowerShell script to integrate your key vault with your application gateway for TLS/SSL termination certificates.

This article requires Azure PowerShell module version 1.0.0 or later. To find the version, run Get-Module -ListAvailable Az. If you need to upgrade, see Install Azure PowerShell module. To run the commands in this article, you also need to create a connection with Azure by running Connect-AzAccount.

If you don't have an Azure subscription, create a free account before you begin.

Prerequisites

Before you begin, you must have the ManagedServiceIdentity module installed:

Install-Module -Name Az.ManagedServiceIdentity
Connect-AzAccount
Select-AzSubscription -Subscription <your subscription>

Example script

Set up variables

$rgname = "KeyVaultTest"
$location = "East US"
$kv = "<your key vault name>"
$appgwName = "AppGwKVIntegration"

Important

The key vault name must be universally unique.

Create a resource group and a user-managed identity

$resourceGroup = New-AzResourceGroup -Name $rgname -Location $location
$identity = New-AzUserAssignedIdentity -Name "appgwKeyVaultIdentity" `
  -Location $location -ResourceGroupName $rgname

Create a key vault, policy, and certificate to be used by the application gateway

$keyVault = New-AzKeyVault -Name $kv -ResourceGroupName $rgname -Location $location
Set-AzKeyVaultAccessPolicy -VaultName $kv -PermissionsToSecrets get -ObjectId $identity.PrincipalId

$policy = New-AzKeyVaultCertificatePolicy -ValidityInMonths 12 `
  -SubjectName "CN=www.contoso11.com" -IssuerName self `
  -RenewAtNumberOfDaysBeforeExpiry 30
Set-AzKeyVaultAccessPolicy -VaultName $kv -EmailAddress <your email address> -PermissionsToCertificates create,get,list
$certificate = Add-AzKeyVaultCertificate -VaultName $kv -Name "cert1" -CertificatePolicy $policy
$certificate = Get-AzKeyVaultCertificate -VaultName $kv -Name "cert1"
$secretId = $certificate.SecretId.Replace($certificate.Version, "")

Create a virtual network

$sub1 = New-AzVirtualNetworkSubnetConfig -Name "appgwSubnet" -AddressPrefix "10.0.0.0/24"
$sub2 = New-AzVirtualNetworkSubnetConfig -Name "backendSubnet" -AddressPrefix "10.0.1.0/24"
$vnet = New-AzvirtualNetwork -Name "Vnet1" -ResourceGroupName $rgname -Location $location `
  -AddressPrefix "10.0.0.0/16" -Subnet @($sub1, $sub2)

Create a static public virtual IP (VIP) address

$publicip = New-AzPublicIpAddress -ResourceGroupName $rgname -name "AppGwIP" `
  -location $location -AllocationMethod Static -Sku Standard

Create pool and frontend ports

$gwSubnet = Get-AzVirtualNetworkSubnetConfig -Name "appgwSubnet" -VirtualNetwork $vnet

$gipconfig = New-AzApplicationGatewayIPConfiguration -Name "AppGwIpConfig" -Subnet $gwSubnet
$fipconfig01 = New-AzApplicationGatewayFrontendIPConfig -Name "fipconfig" -PublicIPAddress $publicip
$pool = New-AzApplicationGatewayBackendAddressPool -Name "pool1" `
  -BackendIPAddresses testbackend1.westus.cloudapp.azure.com, testbackend2.westus.cloudapp.azure.com
$fp01 = New-AzApplicationGatewayFrontendPort -Name "port1" -Port 443
$fp02 = New-AzApplicationGatewayFrontendPort -Name "port2" -Port 80

Point the TLS/SSL certificate to your key vault

$sslCert01 = New-AzApplicationGatewaySslCertificate -Name "SSLCert1" -KeyVaultSecretId $secretId

Create listeners, rules, and autoscale

$listener01 = New-AzApplicationGatewayHttpListener -Name "listener1" -Protocol Https `
  -FrontendIPConfiguration $fipconfig01 -FrontendPort $fp01 -SslCertificate $sslCert01
$listener02 = New-AzApplicationGatewayHttpListener -Name "listener2" -Protocol Http `
  -FrontendIPConfiguration $fipconfig01 -FrontendPort $fp02
$poolSetting01 = New-AzApplicationGatewayBackendHttpSetting -Name "setting1" -Port 80 `
  -Protocol Http -CookieBasedAffinity Disabled
$rule01 = New-AzApplicationGatewayRequestRoutingRule -Name "rule1" -RuleType basic `
  -BackendHttpSettings $poolSetting01 -HttpListener $listener01 -BackendAddressPool $pool
$rule02 = New-AzApplicationGatewayRequestRoutingRule -Name "rule2" -RuleType basic `
  -BackendHttpSettings $poolSetting01 -HttpListener $listener02 -BackendAddressPool $pool
$autoscaleConfig = New-AzApplicationGatewayAutoscaleConfiguration -MinCapacity 3
$sku = New-AzApplicationGatewaySku -Name Standard_v2 -Tier Standard_v2

Assign the user-managed identity to the application gateway

$appgwIdentity = New-AzApplicationGatewayIdentity -UserAssignedIdentityId $identity.Id

Create the application gateway

$appgw = New-AzApplicationGateway -Name $appgwName -Identity $appgwIdentity -ResourceGroupName $rgname `
  -Location $location -BackendAddressPools $pool -BackendHttpSettingsCollection $poolSetting01 `
  -GatewayIpConfigurations $gipconfig -FrontendIpConfigurations $fipconfig01 `
  -FrontendPorts @($fp01, $fp02) -HttpListeners @($listener01, $listener02) `
  -RequestRoutingRules @($rule01, $rule02) -Sku $sku `
  -SslCertificates $sslCert01 -AutoscaleConfiguration $autoscaleConfig

Next steps

Learn more about TLS termination

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