Securing packer builds via allowed_inbound_ip_addresses (#3193)

* Trying to handover additional parameters

* Make restriction to agent ip configurable

* Added additional parameter to all other packer files

* Added note about new parameter's incompatibility with other parameters to command line help

* Added line break for better readability

Co-authored-by: Mikhail Timofeev <48208649+miketimofeev@users.noreply.github.com>

Co-authored-by: Mikhail Timofeev <48208649+miketimofeev@users.noreply.github.com>

helpers/GenerateResourcesAndImage.ps1

@@ -89,6 +89,10 @@ Function GenerateResourcesAndImage {
         .PARAMETER AzureTenantId
             Tenant needs to be provided for optional authentication via service principal. Example: "11111111-1111-1111-1111-111111111111"
 
+        .PARAMETER RestrictToAgentIpAddress
+            If set, access to the VM used by packer to generate the image is restricted to the public IP address this script is run from. 
+            This parameter cannot be used in combination with the virtual_network_name packer parameter.
+
         .EXAMPLE
             GenerateResourcesAndImage -SubscriptionId {YourSubscriptionId} -ResourceGroupName "shsamytest1" -ImageGenerationRepositoryRoot "C:\virtual-environments" -ImageType Ubuntu1604 -AzureLocation "East US"
     #>
@@ -112,6 +116,8 @@ Function GenerateResourcesAndImage {
         [Parameter(Mandatory = $False)]
         [string] $AzureTenantId,
         [Parameter(Mandatory = $False)]
+        [Switch] $RestrictToAgentIpAddress,
+        [Parameter(Mandatory = $False)]
         [Switch] $Force
     )
 
@@ -215,6 +221,11 @@ Function GenerateResourcesAndImage {
         throw "'packer' binary is not found on PATH"
     }
 
+    if($RestrictToAgentIpAddress -eq $true) {
+        $AgentIp = (Invoke-RestMethod http://ipinfo.io/json).ip
+        echo "Restricting access to packer generated VM to agent IP Address: $AgentIp"
+    }
+
     & $packerBinary build -on-error=ask `
         -var "client_id=$($spClientId)" `
         -var "client_secret=$($ServicePrincipalClientSecret)" `
@@ -224,5 +235,6 @@ Function GenerateResourcesAndImage {
         -var "resource_group=$($ResourceGroupName)" `
         -var "storage_account=$($storageAccountName)" `
         -var "install_password=$($InstallPassword)" `
+        -var "allowed_inbound_ip_addresses=$($AgentIp)" `
         $builderScriptPath
 }

images/linux/ubuntu1604.json

@@ -12,6 +12,7 @@
         "virtual_network_resource_group_name": "{{env `VNET_RESOURCE_GROUP`}}",
         "virtual_network_subnet_name": "{{env `VNET_SUBNET`}}",
         "private_virtual_network_with_public_ip": "{{env `PRIVATE_VIRTUAL_NETWORK_WITH_PUBLIC_IP`}}",
+        "allowed_inbound_ip_addresses": "{{env `AGENT_IP`}}",
         "image_folder": "/imagegeneration",
         "imagedata_file": "/imagegeneration/imagedata.json",
         "installer_script_folder": "/imagegeneration/installers",
@@ -45,6 +46,7 @@
             "virtual_network_resource_group_name": "{{user `virtual_network_resource_group_name`}}",
             "virtual_network_subnet_name": "{{user `virtual_network_subnet_name`}}",
             "private_virtual_network_with_public_ip": "{{user `private_virtual_network_with_public_ip`}}",
+            "allowed_inbound_ip_addresses": "{{user `allowed_inbound_ip_addresses`}}",
             "os_type": "Linux",
             "image_publisher": "Canonical",
             "image_offer": "UbuntuServer",

images/linux/ubuntu1804.json

@@ -12,6 +12,7 @@
         "virtual_network_resource_group_name": "{{env `VNET_RESOURCE_GROUP`}}",
         "virtual_network_subnet_name": "{{env `VNET_SUBNET`}}",
         "private_virtual_network_with_public_ip": "{{env `PRIVATE_VIRTUAL_NETWORK_WITH_PUBLIC_IP`}}",
+        "allowed_inbound_ip_addresses": "{{env `AGENT_IP`}}",
         "image_folder": "/imagegeneration",
         "imagedata_file": "/imagegeneration/imagedata.json",
         "installer_script_folder": "/imagegeneration/installers",
@@ -45,6 +46,7 @@
             "virtual_network_resource_group_name": "{{user `virtual_network_resource_group_name`}}",
             "virtual_network_subnet_name": "{{user `virtual_network_subnet_name`}}",
             "private_virtual_network_with_public_ip": "{{user `private_virtual_network_with_public_ip`}}",
+            "allowed_inbound_ip_addresses": "{{user `allowed_inbound_ip_addresses`}}",
             "os_type": "Linux",
             "image_publisher": "Canonical",
             "image_offer": "UbuntuServer",

images/linux/ubuntu2004.json

@@ -12,6 +12,7 @@
         "virtual_network_resource_group_name": "{{env `VNET_RESOURCE_GROUP`}}",
         "virtual_network_subnet_name": "{{env `VNET_SUBNET`}}",
         "private_virtual_network_with_public_ip": "{{env `PRIVATE_VIRTUAL_NETWORK_WITH_PUBLIC_IP`}}",
+        "allowed_inbound_ip_addresses": "{{env `AGENT_IP`}}",
         "image_folder": "/imagegeneration",
         "imagedata_file": "/imagegeneration/imagedata.json",
         "installer_script_folder": "/imagegeneration/installers",
@@ -45,6 +46,7 @@
             "virtual_network_resource_group_name": "{{user `virtual_network_resource_group_name`}}",
             "virtual_network_subnet_name": "{{user `virtual_network_subnet_name`}}",
             "private_virtual_network_with_public_ip": "{{user `private_virtual_network_with_public_ip`}}",
+            "allowed_inbound_ip_addresses": "{{user `allowed_inbound_ip_addresses`}}",
             "os_type": "Linux",
             "image_publisher": "canonical",
             "image_offer": "0001-com-ubuntu-server-focal",

images/win/windows2016.json

@@ -13,6 +13,7 @@
         "virtual_network_resource_group_name": "{{env `VNET_RESOURCE_GROUP`}}",
         "virtual_network_subnet_name": "{{env `VNET_SUBNET`}}",
         "private_virtual_network_with_public_ip": "{{env `PRIVATE_VIRTUAL_NETWORK_WITH_PUBLIC_IP`}}",
+        "allowed_inbound_ip_addresses": "{{env `AGENT_IP`}}",
         "vm_size": "Standard_D8s_v4",
         "run_scan_antivirus": "false",
         "root_folder": "C:",
@@ -53,6 +54,7 @@
             "virtual_network_resource_group_name": "{{user `virtual_network_resource_group_name`}}",
             "virtual_network_subnet_name": "{{user `virtual_network_subnet_name`}}",
             "private_virtual_network_with_public_ip": "{{user `private_virtual_network_with_public_ip`}}",
+            "allowed_inbound_ip_addresses": "{{user `allowed_inbound_ip_addresses`}}",
             "os_type": "Windows",
             "image_publisher": "MicrosoftWindowsServer",
             "image_offer": "WindowsServer",

images/win/windows2019.json

@@ -13,6 +13,7 @@
         "virtual_network_resource_group_name": "{{env `VNET_RESOURCE_GROUP`}}",
         "virtual_network_subnet_name": "{{env `VNET_SUBNET`}}",
         "private_virtual_network_with_public_ip": "{{env `PRIVATE_VIRTUAL_NETWORK_WITH_PUBLIC_IP`}}",
+        "allowed_inbound_ip_addresses": "{{env `AGENT_IP`}}",
         "vm_size": "Standard_D8s_v4",
         "run_scan_antivirus": "false",
         "root_folder": "C:",
@@ -53,6 +54,7 @@
             "virtual_network_resource_group_name": "{{user `virtual_network_resource_group_name`}}",
             "virtual_network_subnet_name": "{{user `virtual_network_subnet_name`}}",
             "private_virtual_network_with_public_ip": "{{user `private_virtual_network_with_public_ip`}}",
+            "allowed_inbound_ip_addresses": "{{user `allowed_inbound_ip_addresses`}}",
             "os_type": "Windows",
             "image_publisher": "MicrosoftWindowsServer",
             "image_offer": "WindowsServer",