Azure Firewall service tags

A service tag represents a group of IP address prefixes to help minimize complexity for security rule creation. You can’t create your own service tag, nor specify which IP addresses are included within a tag. Microsoft manages the address prefixes encompassed by the service tag, and automatically updates the service tag as addresses change.

Azure Firewall service tags can be used in the network rules destination field. You can use them in place of specific IP addresses.

Supported service tags

Azure Firewall supports the following Service Tags to use in Azure Firewall Network rules:

• Tags for various Microsoft and Azure services listed in Virtual network service tags.
• Tags for the required IP addresses of Office365 services, split by Office365 product and category. You must define the TCP/UDP ports in your rules. For more information, see Use Azure Firewall to protect Office 365.

Configuration

Azure Firewall supports configuration of service tags via PowerShell, Azure CLI, or the Azure portal.

Configure via Azure PowerShell

In this example, we must first get context to our previously created Azure Firewall instance.

$FirewallName = "AzureFirewall"
$ResourceGroup = "AzureFirewall-RG"
$azfirewall = Get-AzFirewall -Name $FirewallName -ResourceGroupName $ResourceGroup

Next, we must create a new rule. For the Destination, you can specify the text value of the service tag you wish to leverage, as mentioned previously.

$rule = New-AzFirewallNetworkRule -Name "AllowSQL" -Description "Allow access to Azure Database as a Service (SQL, MySQL, PostgreSQL, Datawarehouse)" -SourceAddress "10.0.0.0/16" -DestinationAddress Sql -DestinationPort 1433 -Protocol TCP
$ruleCollection = New-AzFirewallNetworkRuleCollection -Name "Data Collection" -Priority 1000 -Rule $rule -ActionType Allow

Next, we must update the variable containing our Azure Firewall definition with the new network rules we created.

$azFirewall.NetworkRuleCollections.add($ruleCollection)

Last, we must commit the Network Rule changes to the running Azure Firewall instance.

Set-AzFirewall -AzureFirewall $azfirewall

Next steps

To learn more about Azure Firewall rules, see Azure Firewall rule processing logic.