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 - Storage account public blob access scenario
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README.md

Azure Policy Samples

This repository contains built-in samples of Azure Policies that can be used as reference for creating and assigning policies to your subscriptions and resource groups. For easy search of all built-in with descriptions, see Policy samples on docs.microsoft.com.

For custom policy samples, check out our Community repo! (https://github.com/Azure/Community-Policy)

Contributing

To contribute, please submit your policies to our Community repo! (https://github.com/Azure/Community-Policy)

Reporting Samples Issues

If you discover a problem with any of the samples published here that isn't already reported in Issues, open a New issue.

Azure Policy Known Issues

Check here for a current list of known issues for Azure Policy.

Azure Policy Resources

Articles

References

Getting Support

The general Azure Policy support role of this repository has transitioned to standard Azure support channels. See below for information about getting support help for Azure Policy.

Alias Requests

An alias enables you to restrict what values or conditions are permitted for a property on a resource. Each alias maps to the paths in different API versions for a given resource type. During policy evaluation, the policy engine gets the property path for that API version. See the documentation page on aliases here. For additional information about Azure Policy and aliases, visit this blog post.

Previously, this repository was the official channel to open requests for new aliases. Since the full set of aliases for most namespaces have now been published, support for requesting aliases is now handled by Azure Customer Support. Open a new Azure Customer Support ticket if you believe you need new aliases to be published.

This page documents the commands for discovering existing aliases.

General Questions

If you have questions you haven't been able to answer from the Azure Policy documentation, there are a few places that host discussions on Azure Policy:

If your questions are more in-depth or involve information that is not public, open a new Azure Customer Support ticket.

Documentation Corrections

To report issues in the Azure Policy online documentation, look for a feedback area at the bottom of the page. If you don't see a place to enter feedback, you can also directly open a new issue at the Microsoft Docs GitHub.

New built-in Policy Proposals

If you have ideas for new built-in policies you want to suggest to Microsoft, you can submit them to Azure Governance User Voice. These suggestions are actively reviewed and prioritized for implementation.

Other Support for Azure Policy

If you are encountering livesite issues or difficulties in implementing new policies that may be due to problems in Azure Policy itself, open a support ticket at Azure Customer Support. If you want to submit an idea for consideration, add an idea or upvote an existing idea at Azure Governance User Voice.

Known Issues

Azure Policy operates at a level above other Azure services by applying policy rules against PUT requests and GET responses of resource types going between Azure Resource Manager and the owning resource provider (RP). In a few cases, the behavior of a given RP is unexpected or incompatible in some way with Azure Policy. The Azure Policy team works with the RP teams to close these gaps as soon as possible after they are discovered. Usually aliases for properties of these resource types will be removed after the anomalous behavior is discovered. Issues of this nature will be documented here until final resolution.

All cases of known resource types with anomalous policy behavior are listed here. Currently there is no way to make these resource types invisible at policy authoring time, so writing policies that attempt to manage these resource types cannot be prevented, despite the fact that the results of such policies may be either incomplete or incorrect.

Resource Type query results incomplete, missing, or non-standard format

In some cases, certain RPs may return incomplete or otherwise limited or missing information about resources of a given type. The Azure Policy engine is unable to determine the compliance of any resources of such a type. Below are listed the known resource types exhibiting this problem.

  • Microsoft.Web/sites (siteConfig property)
  • Microsoft.Web/sites/config/* (except Microsoft.Web/sites/config/web)

Currently, there is no plan to change this behavior for the above Microsoft.Web resource types. If this scenario is important to you, please open a support ticket with the Web team.

  • Microsoft.HDInsights/clusters/computeProfile.roles[*].scriptActions
  • Microsoft.Sql/servers/auditingSettings
    • This type will work correctly as the related resource in AuditIfNotExists and DeployIfNotExists policies, as long as a name for the resource is provided, e.g:
              "details": {
                "type": "Microsoft.Sql/servers/auditingSettings",
                "name": "default"
              }
    
  • Microsoft.DataLakeStore/accounts
    • This type behaves similarly to Microsoft.Sql/servers/autidintSettings. Compliance of some fields cannot be determined except in AuditIfNotExits and DeployIfNotExists.
  • Microsoft.Compute/virtualMachines/instanceView

The potential for fixing these resource types is still under investigation.

Resource Type not correctly published by resource provider

In some cases, a resource provider may implement a resource type, but not correctly publish it to the Azure Resource Manager. The result of this is that Azure Policy is unable to discover the type in order to determine compliance. In some cases, this still allows deny policies to work, but compliance results will usually be incorrect. These resource types exhibit this behavior:

  • Microsoft.Storage/storageAccounts/blobServices

These resource types previously exhibited this behavior, but are now removed:

  • Microsoft.EventHub/namespaces/networkRuleSet (replaced by Microsoft.EventHub/namespaces/networkrulesets)
  • Microsoft.ServiceBus/namespaces/networkRuleSet (replaced by Microsoft.ServiceBus/namespaces/networkrulesets)

In some cases the unpublished resource type is actually a subtype of a published type, which causes aliases to refer to a parent type instead of the unpublished type. Evaluation of such policies fails, causing the policy to never apply to any resource.

These resource types previously exhibited this behavior but have been fixed:

  • Microsoft.EventHub/namespaces/networkrulesets
  • Microsoft.ServiceBus/namespaces/networkrulesets
  • Microsoft.Sql/servers/databases/backupShortTermRetentionPolicies
  • Microsoft.ApiManagement/service/portalsettings/delegation

Resource management that bypasses Azure Resource Manager

Resource providers are free to implement their own resource management operations outside of Azure Resource Manager ("dataplane" operations). In almost every Azure resource type, the distinction between resource management and dataplane operations is clear and the resource provider only implements resource management one way. Occasionally, a resource provider may choose to implement a type that can be managed both ways. In this case, Azure Policy controls the standard Azure Resource Manager API normally, but operations on the direct resource provider API to create, modify and delete resources of that type bypass Azure Resource Manager so they are invisible to Azure Policy. Since policy enforcement is incomplete, we recommend that customers do not implement policies targeting such a resource type. This is the list of known such resource types:

  • Microsoft.Storage/storageAccounts/blobServices/containers

The storage team has implemented blob public access control on storage accounts to address this scenario. Per-account public access control of blobs can be controlled by Azure Policy using the new alias Microsoft.Storage/storageAccounts/allowBlobPublicAccess.

Note that Azure policies for dataplane operations of certain targeted resource providers is also supported or under active development.

  • Microsoft.Sql/servers/firewallRules

Firewall rules can be created/deleted/modified via T-SQL commands, which bypasses Azure Policy. There is currently no plan to address this.

  • Microsoft.ServiceFabric/clusters/applications

Service Fabric applications created via direct requests to the Service Fabric cluster (i.e. via New-ServiceFabricApplication) will not appear in the Azure Resource Manager representation of the Service Fabric cluster. Policy will not be able to audit/enforce these applications.

Nonstandard creation pattern

In a few instances, the creation pattern of a resource type doesn't follow normal REST patterns. In these cases, deny policies may not work or may only work for some properties. For example, certain resource types may PUT only a subset of the properties of the resource type to create the entire resource. With such types the resource provider selects the values for properties not provided in the payload. Such a resource might be created with a non-compliant value even though a deny policy exists to prevent it. A similar result may occur if a set of resource types can be created using a collection PUT. Known resource types that exhibit this class of behavior:

  • Microsoft.Sql/servers/firewallRules
  • Microsoft.Automation/certificates
  • Microsoft.Security/securityContacts

There is currently no plan to change this behavior for these types. If this scenario is important to you, please open a support ticket with the Azure SQL or Automation team.

Provider pass-through to non Azure Resource Manager resources

There are examples where a resource provider publishes a resource type to Azure Resource Manager, but the resources it represents cannot be managed by Azure Resource Manager. For example, Microsoft.Web has published several resource types to Azure Resource Manager that actually represent resources of the customer's site rather than Azure Resource Manager resources. Such resources cannot or should not be managed by Azure policy, and are explicitly excluded. All known examples are listed here:

  • Microsoft.Web/sites/deployments
  • Microsoft.Web/sites/functions
  • Microsoft.Web/sites/instances/deployments
  • Microsoft.Web/sites/siteextensions
  • Microsoft.Web/sites/slots/deployments
  • Microsoft.Web/sites/slots/functions
  • Microsoft.Web/sites/slots/instances/deployments
  • Microsoft.Web/sites/slots/siteextensions

Legacy or incorrect aliases

Since custom policies use aliases directly, it is usually not possible to update them without causing unintended side effects to existing custom policies. This means that aliases referring to incorrect information or following legacy naming conventions must be left in place, even though it may cause confusion. In certain cases where an alias is known to refer to the wrong information, another alias may be created as a corrected alternative to the known bad one. In these cases, the new alias will be given the name of the bad alias with .v2 appended. For example a bad alias named Microsoft.ResourceProvider/someType/someAlias would result in the addition of a corrected version named Microsoft.ResourceProvider/someType/someAlias.v2. If an alias is added to correct a .v2 alias it will be named by replacing v2 with v3. All known corrected aliases are listed here:

  • Microsoft.Sql/servers/databases/requestedServiceObjectiveName.v2

Optional or auto-generated resource property that bypasses policy evaluation

In a few instances, when creating a resource from Azure Portal, the property is not set in the PUT request payload. When the request reaches the resource provider, the resource provider generates the property and sets the value. Because the property is not in the request payload, the policy cannot evaluate the property. Known resource fields that exhibit this class of behavior:

  • Microsoft.Storage/storageAccounts/networkAcls.defaultAction
  • Microsoft.Authorization/roleAssignments/principalType
  • Microsoft.Compute/virtualMachines/storageProfile.osDisk.diskSizeGB
  • Microsoft.Compute/virtualMachineScaleSets/virtualMachineProfile.storageProfile.osDisk.diskSizeGB
  • Microsoft.Compute/virtualMachineScaleSets/virtualMachines/storageProfile.osDisk.diskSizeGB

Using this type of alias in the existence condition of auditIfNotExists or deployIfNotExists policies works correctly. These two kinds of effects will get the full resource content to evaluate the existence condition. The property is always present in GET request payloads.

Using this type of alias in audit/deny/append effect policies works partially. The compliance scan result will be correct for existing resources. However, when creating/updating the resource, there will be no audit events for audit effect policies and no deny or append behaviors for deny/append effect policies because of the missing property in the request payload.

-Microsoft.Databricks/* (Creation time only)

All Databricks reasources bypass policy enforcement at creation time. Databricks resources will have policy enforcement post-creation. To provide feedback on this, please leverage the [Databricks UserVoice] (https://feedback.azure.com/forums/909463-azure-databricks).

Resource types that exceed current enforcement and compliance scale

There some resource types that are generated at very high scale. These are not suitable for management by Azure Policy because the enforcement and compliance checks create overhead that can negatively impact the performance of the API itself. Most of these are not significant policy scenarios, but there are a few exceptions.

These are resource types that have significant policy scenarios, but are not supported by Azure Policy due to the above scalability considerations:

  • Microsoft.ServiceBus/namespaces/topics
  • Microsoft.ServiceBus/namespaces/topics/authorizationRules
  • Microsoft.ServiceBus/namespaces/topics/subscriptions
  • Microsoft.ServiceBus/namespaces/topics/subscriptions/rules

Work to increase the scale that policy can be performantly applied to resource types is in progress. Planned availability date is not yet determined.

Azure Policy Add-on not compatible on AKS Kubernetes 1.19 (preview) version

1.19 clusters will return this error via gatekeeper controller and policy webhook pods: certificate relies on legacy Common Name field, use SANs or temporarily enable Common Name matching

Mitigation: Avoid using K8s 1.19 (preview) with the Azure Policy add-on. The add-on can be used with any GA supported version such as 1.16, 1.17, or 1.18. Feature team is actively working on fixing this issue. GitHub issue tracking this on AKS side https://github.com/Azure/AKS/issues/1869

Indexed Resource types always non-complaint to tagging policies

There are some resource types that even though are indexed, do not support Tagging Policies. Here are the list of those with issue:

  • Master SQL DB
  • Microsoft.alertsmanagement/smartdetectoralertrules
  • Microsoft.AnalysisServices/servers (Cannot use periods '.')
  • Microsoft.compute/virtualmachines/extensions
  • Microsoft.DataMigration
  • Microsoft.DBforPostgreSQL/servers
  • Microsoft.Insights/actiongroups
  • Microsoft.Insights/activitylogalerts
  • Microsoft.Insights/alertrules
  • Microsoft.Insights/autoscalesettings
  • Microsoft.Insights/components
  • Microsoft.Insights/guestDiagnosticSettings
  • Microsoft.Insights/metricalerts (All tags will be automatically lowercased)
  • Microsoft.Logic/workflows
  • Microsoft.Netowork/trafficManagerProfiles/heatmapps
  • Microsoft.Network/frontdoors
  • Microsoft.Network/networkWatchers
  • Microsoft.Network/networkWatchers/flowLogs
  • Microsoft.Network/trafficManagerProfiles/ (Does not support spaces ' ')
  • Microsoft.offazure/vmwaresites
  • Microsoft.OperationsManagement/solutions
  • Microsoft.Portal/dashboards (All tags will be automatically lowercased)
  • Microsoft.Sql/virtualClusters
  • Microsoft.Web/certificates (Does not support numbers)

To add one to the list please add it in this UserVoice Item: here

Alias changes

May 2020: Microsoft.DocumentDB/databaseAccounts/ipRangeFilter updated from a string property to an array. Please re-author your custom definitions to support the property as an array.
July 2020: The alias Microsoft.Sql/servers/securityAlertPolicies/emailAddresses[] and related policies were deprecated.

Tag Contributor Role

Current limitation causes errors using the Tag Contributor role with Tag related policies. We are aware of this issue and are working to resolve this. (ETA: End of calendar year). If assigning Tag Contributor role to managed identities handling remediation tasks on "Modify" effect policies, please assign Contributor role to the managed identity.

Subscription tagging support

Subscription tagging is not yet supported using "Append" or "Modify" policies. Details on subscription tagging without using Azure Policy can be found here.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.

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