ApplicationControl CSP

Windows Defender Application Control (WDAC) policies can be managed from an MDM server through ApplicationControl configuration service provider (CSP). This CSP provides expanded diagnostic capabilities and support for multiple policies (introduced in Windows 10, version 1903). It also provides support for rebootless policy deployment (introduced in Windows 10, version 1709). Unlike AppLocker CSP, ApplicationControl CSP correctly detects the presence of no-reboot option and consequently does not schedule a reboot. Existing WDAC policies deployed using AppLocker CSP’s CodeIntegrity node can now be deployed using ApplicationControl CSP URI. Although WDAC policy deployment via AppLocker CSP will continue to be supported, all new feature work will be done in ApplicationControl CSP only.

ApplicationControl CSP was added in Windows 10, version 1903.

The following diagram shows ApplicationControl CSP in tree format.

tree diagram for applicationcontrol csp

./Vendor/MSFT/ApplicationControl
Defines the root node for ApplicationControl CSP.

Scope is permanent. Supported operation is Get.

ApplicationControl/Policies
An interior node that contains all the policies, each identified by their globally unique identifier (GUID).

Scope is permanent. Supported operation is Get.

ApplicationControl/Policies/Policy GUID
ApplicationControl CSP enforces that the “ID” segment of a given policy URI is the same GUID as the policy ID in the policy blob. Each Policy GUID node contains a Policy node and a corresponding PolicyInfo node.

Scope is dynamic. Supported operation is Get.

ApplicationControl/Policies/Policy GUID/Policy
This node is the policy binary itself, which is encoded as base64.

Scope is dynamic. Supported operations are Get, Add, Delete, and Replace.

Value type is b64. Supported value is a binary file, converted from the policy XML file by the ConvertFrom-CIPolicy cmdlet.

Default value is empty.

ApplicationControl/Policies/Policy GUID/PolicyInfo
An interior node that contains the nodes that describe the policy indicated by the GUID.

Scope is dynamic. Supported operation is Get.

ApplicationControl/Policies/Policy GUID/PolicyInfo/Version
This node provides the version of the policy indicated by the GUID. Stored as a string, but when parsing use a uint64 as the containing data type.

Scope is dynamic. Supported operation is Get.

Value type is char.

ApplicationControl/Policies/Policy GUID/PolicyInfo/IsEffective
This node specifies whether a policy is actually loaded by the enforcement engine and is in effect on a system.

Scope is dynamic. Supported operation is Get.

Value type is bool. Supported values are as follows:

  • True — Indicates that the policy is actually loaded by the enforcement engine and is in effect on a system.
  • False — Indicates that the policy is not loaded by the enforcement engine and is not in effect on a system. This is the default.

ApplicationControl/Policies/Policy GUID/PolicyInfo/IsDeployed
This node specifies whether a policy is deployed on the system and is present on the physical machine.

Scope is dynamic. Supported operation is Get.

Value type is bool. Supported values are as follows:

  • True — Indicates that the policy is deployed on the system and is present on the physical machine.
  • False — Indicates that the policy is not deployed on the system and is not present on the physical machine. This is the default.

ApplicationControl/Policies/Policy GUID/PolicyInfo/IsAuthorized
This node specifies whether the policy is authorized to be loaded by the enforcement engine on the system. If not authorized, a policy cannot take effect on the system.

Scope is dynamic. Supported operation is Get.

Value type is bool. Supported values are as follows:

  • True — Indicates that the policy is authorized to be loaded by the enforcement engine on the system.
  • False — Indicates that the policy is not authorized to be loaded by the enforcement engine on the system. This is the default.

The following table provides the result of this policy based on different values of IsAuthorized, IsDeployed, and IsEffective nodes:

IsAuthorized IsDeployed IsEffective Resultant
True True True Policy is currently running and in effect.
True True False Policy requires a reboot to take effect.
True False True Policy requires a reboot to unload from CI.
False True True Not Reachable.
True False False *Not Reachable.
False True False *Not Reachable.
False False True Not Reachable.
False False False *Not Reachable.

* denotes a valid intermediary state; however, if an MDM transaction results in this state configuration, the END_COMMAND_PROCESSING will result in a fail.

ApplicationControl/Policies/Policy GUID/PolicyInfo/Status
This node specifies whether the deployment of the policy indicated by the GUID was successful.

Scope is dynamic. Supported operation is Get.

Value type is integer. Default value is 0 == OK.

ApplicationControl/Policies/Policy GUID/PolicyInfo/FriendlyName
This node provides the friendly name of the policy indicated by the policy GUID.

Scope is dynamic. Supported operation is Get.

Value type is char.

Usage guidance

To use ApplicationControl CSP, you must:

  • Know a generated policy’s GUID, which can be found in the policy xml as <PolicyTypeID>.
  • Convert the policies to binary format using the ConvertFrom-CIPolicy cmdlet in order to be deployed. The binary policy may be signed or unsigned.

If you are using hybrid MDM management with System Center Configuration Manager or using Intune, ensure that you are using Base64 as the Data type when using Custom OMA-URI functionality to apply the Code Integrity policy via uploading the binary file.

Deploy policies

To deploy a new base policy using the CSP, perform an ADD on ./Vendor/MSFT/ApplicationControl/Policies/Policy GUID/Policy using the Base64-encoded policy node as {Data}. Refer to the the Format section in the Example 1 below.

To deploy base policy and supplemental policies:

  • Perform an ADD on ./Vendor/MSFT/ApplicationControl/Policies/Policy GUID/Policy using the Base64-encoded policy node as {Data} with the GUID and policy data for the base policy.
  • Repeat for each base or supplemental policy (with its own GUID and data).

The following example shows the deployment of two base policies and a supplemental policy (which already specifies the base policy it supplements and does not need that reflected in the ADD).

Example 1: Add first base policy

<Add>
    <CmdID>1</CmdID>
    <Item>
        <Target>
            <LocURI>./Vendor/MSFT/ApplicationControl/Policies/{Base1GUID}/Policy</LocURI>
        </Target>
        <Meta>
             <Format xmlns="syncml:metinf">b64</Format>
        </Meta>
        <Data> {Base1Data} </Data>
    </Item>
</Add>

Example 2: Add second base policy

<Add>
    <CmdID>1</CmdID>
    <Item>
        <Target>
            <LocURI>./Vendor/MSFT/ApplicationControl/Policies/{Base2GUID}/Policy</LocURI>
        </Target>
        <Meta>
            <Format xmlns="syncml:metinf">b64</Format>
        </Meta>
        <Data> {Base2Data} </Data>
    </Item>
</Add>

Example 3: Add supplemental policy

<Add>
    <CmdID>1</CmdID>
    <Item>
        <Target>
            <LocURI>./Vendor/MSFT/ApplicationControl/Policies/{Supplemental1GUID}/Policy</LocURI>
        </Target>
        <Meta>
            <Format xmlns="syncml:metinf">b64</Format>
        </Meta>
        <Data> {Supplemental1Data} </Data>
    </Item>
</Add>

Get policies

Perform a GET using a deployed policy’s GUID to interrogate/inspect the policy itself or information about it.

The following table displays the result of Get operation on different nodes:

Nodes Get Results
./Vendor/MSFT/ApplicationControl/Policies/Policy GUID/Policy raw p7b
./Vendor/MSFT/ApplicationControl/Policies/Policy GUID/PolicyInfo/Version Policy version
./Vendor/MSFT/ApplicationControl/Policies/Policy GUID/PolicyInfo/IsEffective Is the policy in effect
./Vendor/MSFT/ApplicationControl/Policies/Policy GUID/PolicyInfo/IsDeployed Is the policy on the system
./Vendor/MSFT/ApplicationControl/Policies/Policy GUID/PolicyInfo/IsAuthorized Is the policy authorized on the system
./Vendor/MSFT/ApplicationControl/Policies/Policy GUID/PolicyInfo/Status Was the deployment successful
./Vendor/MSFT/ApplicationControl/Policies/Policy GUID/PolicyInfo/FriendlyName Friendly name per the policy

The following is an example of Get command:

 <Get>
    <CmdID>1</CmdID>
        <Item>
            <Target>
                <LocURI>./Vendor/MSFT/ApplicationControl/Policies/{PolicyGUID}/Policy</LocURI>
            </Target>
        </Item>
 </Get>

Delete policies

To delete an unsigned policy, perform a DELETE on ./Vendor/MSFT/ApplicationControl/Policies/Policy GUID/Policy.

Note

Only signed things should be able to update signed policies. Hence, performing a DELETE on ./Vendor/MSFT/ApplicationControl/Policies/Policy GUID/Policy is not sufficient to delete a signed policy.

To delete a signed policy:

  1. Replace it with a signed update allowing unsigned policy.
  2. Deploy another update with unsigned policy.
  3. Perform delete.

The following is an example of Delete command:

   <Delete>
     <CmdID>1</CmdID>
        <Item>
            <Target>
                  <LocURI>./Vendor/MSFT/ApplicationControl/Policies/{PolicyGUID}/Policy</LocURI>
            </Target>
        </Item>
   </Delete>