Use Managed Identities for Azure Function Apps

01 Sign in to the Microsoft Azure Portal.

02 Navigate to All resources blade available at https://portal.azure.com/#browse/all to access your Azure cloud resources.

03 Choose the Azure subscription that you want to access from the Subscription equalls all filter box and choose Apply.

04 From the Type equalls all filter box, choose Equals, select Function App, and choose Apply to list only the Microsoft Azure Function Apps available in the selected subscription.

05 Click on the name (link) of the Azure Function App that you want to examine.

06 In the resource navigation panel, under Settings, select Identity, and perform the following checks to determine if the selected Azure Function App is using managed identities:

1. Select the System assigned tab and check the configuration setting status available under Status. If Status is set to Off, the selected Microsoft Azure Function App is not using a system-assigned managed identity.
2. Select the User assigned tab and check for any user-assigned managed identities associated with the selected resource. If there are no user identities listed on this page, instead the following message is displayed: No results, the selected Microsoft Azure Function App is not using user-assigned managed identities.

07 Repeat steps no. 5 and 6 for each Azure Function App deployed in the selected Azure subscription.

08 Repeat steps no. 3 – 7 for each subscription created in your Microsoft Azure cloud account.

01 Run account list command (Windows/macOS/Linux) with custom output filters to list the IDs of the cloud subscriptions available in your Azure cloud account:

az account list
  --query '[*].id'

02 The command output should return the requested subscription identifiers (IDs):

[
	"abcdabcd-1234-abcd-1234-abcdabcdabcd",
	"abcd1234-abcd-1234-abcd-abcd1234abcd"
]

03 Run account set command (Windows/macOS/Linux) with the ID of the Azure cloud subscription that you want to examine as the identifier parameter to set the selected subscription to be the current active subscription (the command does not produce an output):

az account set
  --subscription abcdabcd-1234-abcd-1234-abcdabcdabcd

04 Run functionapp list command (Windows/macOS/Linux) with custom query filters to list the name and the associated resource group for each Azure Function App available in the selected subscription:

az functionapp list
  --output table
  --query '[*].{name:name, resourceGroup:resourceGroup}'

05 The command output should return the requested Function App names:

Name                      ResourceGroup
----------------------    ------------------------------
cc-main-function-app      cloud-shell-storage-westeurope
cc-project5-function-app  cloud-shell-storage-westeurope

06 Run functionapp show command (Windows/macOS/Linux) with the name of the Azure Function App that you want to examine and its associated resource group as the identifier parameters to determine the type of the managed identity (i.e. system-assigned and/or user-assigned) configured for the selected Function App:

az functionapp show
  --name cc-main-function-app
  --resource-group cloud-shell-storage-westeurope
  --query '{"IdentityType":identity.type}'

07 The command output should return the identity type used by the selected Function App:

{
	"IdentityType": null
}

08 Repeat step no. 6 and 7 for each Azure Function App available within the current Azure subscription.

09 Repeat steps no. 3 – 8 for each subscription created in your Microsoft Azure cloud account.

01 Sign in to the Microsoft Azure Portal.

02 Navigate to Managed Identities blade available at https://portal.azure.com/#browse/Microsoft.ManagedIdentity%2FuserAssignedIdentities.

03 Choose the Azure subscription that you want to access from the Subscription equalls all filter box and choose Apply.

04 Choose Create and perform the following actions to create a new user-assigned managed identity:

1. For Basics, choose the correct subscription and resource group, provide a unique name for the new managed identity, then select the Azure region where your cloud resources are deployed. Choose Next to continue the setup process.
2. For Tags, use the Name and Value fields to create tags that will help organize the identity of the identity. Choose Review + create to validate the identity setup.
3. For Review + create, review the resource configuration details, then choose Create to create your new user-assigned managed identity.

05 Navigate to All resources blade available at https://portal.azure.com/#browse/all to access your Azure cloud resources.

06 Choose the appropriate Azure subscription from the Subscription equalls all filter box and choose Apply.

07 From the Type equalls all filter box, choose Equals, select Function App, and choose Apply to list only the Microsoft Azure Function Apps available in the selected subscription.

08 Click on the name (link) of the Azure Function App that you want to configure.

09 In the resource navigation panel, under Settings, select Identity, and perform the following actions to enable system-assigned and user-assigned managed identities for the selected Azure Function App:

1. Choose the System assigned tab and select On under Status to enable the system-assigned managed identity for the selected Function App. Choose Save and select Yes to confirm the changes. The selected Azure Function App instance is now registered with Microsoft Entra ID, eliminating the need to store credentials in your code.
2. Select the User assigned tab, choose + Add, select the appropriate Azure subscription from the Select a subscription dropdown list, and choose the user-assigned managed identity created earlier in the Remediation process, from the User assigned managed identities list. Choose Add to apply the configuration changes.

10 Repeat steps no. 8 and 9 for each Azure Function App that you want to configure, deployed in the selected Azure subscription.

11 Repeat steps no. 3 – 10 for each subscription created in your Microsoft Azure cloud account.

01 Run account list command (Windows/macOS/Linux) with custom output filters to list the IDs of the cloud subscriptions available in your Azure cloud account:

az account list
  --query '[*].id'

02 The command output should return the requested subscription identifiers (IDs):

[
	"abcdabcd-1234-abcd-1234-abcdabcdabcd",
	"abcd1234-abcd-1234-abcd-abcd1234abcd"
]

03 Run account set command (Windows/macOS/Linux) with the ID of the Azure cloud subscription that you want to examine as the identifier parameter to set the selected subscription to be the current active subscription (the command does not produce an output):

az account set
  --subscription abcdabcd-1234-abcd-1234-abcdabcdabcd

04 Run functionapp identity assign command (OSX/Linux/UNIX) with the name of the Azure Function App that you want to configure as the identifier parameter to enable the system-assigned managed identity for the function managed with the specified Function App:

az functionapp identity assign
  --name cc-main-function-app
  --resource-group cloud-shell-storage-westeurope
  --identities [system]

05 Once the assignment process is completed, the command output should return the information available for the managed identity:

{
	"principalId": "abcd1234-abcd-1234-abcd-1234abcd1234",
	"tenantId": "1234abcd-abcd-1234-abcd-abcd1234abcd",
	"type": "SystemAssigned",
	"userAssignedIdentities": null
}

06 Run identity create command (OSX/Linux/UNIX) to create a new user-assigned managed identity for the specified Azure Function App:

az identity create
  --name cc-main-function-app
  --resource-group cloud-shell-storage-westeurope
  --location westeurope
  --query 'id'

07 The command output should return the full ID of the new user-assigned managed identity:

"/subscriptions/abcd1234-abcd-1234-abcd-1234abcd1234/resourcegroups/cloud-shell-storage-westeurope/providers/Microsoft.ManagedIdentity/userAssignedIdentities/cc-main-function-app"

08 Run functionapp identity assign command (OSX/Linux/UNIX) with the name of the Azure Function App that you want to configure as the identifier parameter to assign your new user-assigned managed identity to the selected Function App:

az functionapp identity assign
  --name cc-main-function-app
  --resource-group cloud-shell-storage-westeurope
  --identities "/subscriptions/abcd1234-abcd-1234-abcd-1234abcd1234/resourcegroups/cloud-shell-storage-westeurope/providers/Microsoft.ManagedIdentity/userAssignedIdentities/cc-main-function-app"

09 Once the assignment process is completed, the command output should return the information available for the managed identity:

{
	"principalId": null,
	"tenantId": null,
	"type": "UserAssigned",
	"userAssignedIdentities":{
		"/subscriptions/abcd1234-abcd-1234-abcd-1234abcd1234/resourcegroups/cloud-shell-storage-westeurope/providers/Microsoft.ManagedIdentity/userAssignedIdentities/cc-main-function-apps": {
			"clientId": "1234abcd-abcd-1234-abcd-abcd1234abcd",
			"principalId": "abcd1234-abcd-1234-abcd-1234abcd1234"
		}
	}
}

10 Repeat steps no. 4 - 9 for each Azure Function App that you want to configure, available within the current subscription.

11 Repeat steps no. 3 – 10 for each subscription created in your Microsoft Azure cloud account.