Conditional access and health attestation

This week another blog post about conditional access. And another blog post that is triggered by a feature that is introduced in ConfigMgr 1602. However, this time it’s about a feature that already did exist in Microsoft Intune standalone. I’m talking about the new conditional access rule that uses the Health Attestation Service. This new rule creates the ability to ensure that Windows 10 devices have trustworthy BIOS, TPM, and boot software configurations enabled.

In this blog post I’ll show the detailed configuration steps for Microsoft Intune hybrid and I’ll briefly note the most important configurations for Microsoft Intune standalone.

Introduction

Device health attestation is an additional level of restricting access to Exchange Online and SharePoint Online for Windows 10 devices. Currently only available for Windows 10 devices that are managed via OMA-DM. It adds the ability to create compliance policies that require Windows 10 devices to report as healthy. Device health attestation can be used to ensure that the following trustworthy configurations are enabled:

  • BitLocker: BitLocker provides encryption for all data stored on the Windows operating system volume.
  • Code integrity: Code Integrity provides improvements to the security of the operating system by validating the integrity of a driver, or system file, each time it is loaded into memory.
  • Early-launch antimalware (only applies to PCs): Early launch anti-malware (ELAM) provides protection for computers when they start up and before third-party drivers initialize.
  • Secure boot: Secure boot provides a security standard, which is developed by members of the PC industry, to help make sure that a PC boots with only software that is trusted by the PC manufacturer.

Note: A Windows 10 device must be compliant to all of the applicable configurations to be reported as healthy by the Health Attestation Service.

Pre-configuration

Before looking at the configuration of conditional access and device health attestation, I will begin with mentioning a new client setting and the health attestation dashboard. This is at least as important, as it will provide a good understanding about the impact of using conditional access based on the status reported by the Health Attestation Service.

Default client settings

To start with collecting information about the status, reported by the Health Attestation Service, of Windows 10 devices, it’s good to start with enabling the communication with the Health Attestation Service,. The following 2 steps will make sure that the information will be collected.

1 In the Configuration Manager administration console, navigate to Administration > Overview > Client Settings and open the Default Client Settings;
2

CA_ClientSettings_HAIn the Default Client Setting, navigate to Computer Agent and select Yes with Enable communication with Health Attestation Service and click OK to close the Default Client Settings..

Health attestation dashboard

After configuring the Default Client Settings, the information of the Health Attestation Service, on Windows 10 devices, will start showing in the health attestation dashboard and the List of devices by Health Attestation state report. This information can be used to get a good understanding about the impact of enabling conditional access based on the  status reported by the Health Attestation Service. The health attestation dashboard is available by navigating to Monitoring > Overview > Security > Health Attestation and will look like the following example.

CA_Intune_HealthAttestation

Note: In Microsoft Intune standalone similar reports are available, in the Reports section, named Health Attestation Reports.

Configuration

Let’s continue with looking at the real configuration for conditional access. I will start with briefly mentioning the conditional access policy and I’ll end this configuration section with going through all the required steps for creating the compliance policy.

Conditional access policy

Now that I know what the impact will be of using the health of a Windows 10 device, reported by the Health Attestation Service, I can start with enabling conditional access. Just like last week, I’ll only mention the conditional access policy briefly. It’s important that the setting Windows must meet the following requirements is selected and configured to Devices must be compliant. Also, for supporting Windows 10 mobile, it’s important to also select Windows 10 Mobile. These settings can be configured as shown below for Exchange Online and SharePoint Online.

Exchange Online Policy SharePoint Online Policy
CA_ExchOnl_Win10 CA_SPOnl_Win10

Compliance policy

Like last week, the more interesting configuration is the configuration of the new compliance policy. The following 9 steps will go through the creation of the compliance policy. After the creation of the compliancy policy, it can be deployed, like any other policy, to users.

1 In the Configuration Manager administration console, navigate to Assets and Compliance > Overview > Compliance Settings > Compliance Policies;
2 On the Home tab, click Create Compliance Policy to open the Create Compliance Policy Wizard;
3

On the General page, specify the following information and click Next;

  • CA_ConfigMgrIntune_CP_GeneralName: [Specify a unique name for the compliance policy]
  • Description: [Specify details that help identifying the compliance policy]
  • Select Compliance rules for devices managed without the Configuration Manager client with Specify the type of compliance policy that you want to create
    • Select Windows 8.1 and Windows 10

Note: Select Windows Phone and Windows 10 Mobile for supporting the configuration on Windows 10 Mobile devices.

4

On the Supported Platforms page, select the following platforms and click Next;

  • CA_ConfigMgrIntune_CP_PlatformAll Windows 10 (64-bit)
  • All Windows 10 (32-bit)

Note: Select All Windows 10 Mobile and higher for supporting the configuration on Windows 10 Mobile devices.

5 On the Rules page, click New… to open the Add Rule dialog box;
6

ICA_ConfigMgrIntune_CP_AddRulen the Add Rule dialog box, select the Reported as healthy by the Health Attestation Service rule and click OK to return to the Rules page;

7

CA_ConfigMgrIntune_CP_RulesBack on the Rules page, verify the created configuration and click Next;

8 On the Summary page, click Next
9 On the Completion page, click Close.
CA_Intune_CompliancePolicyNote: In Microsoft Intune standalone a similar compliance policy setting is available, in the Device Health section, named Require devices to be reported as healthy.

End-user experience

Now it’s time to look at the end-user experience. This time I won’t show the end-user experience of a non-compliant device connecting to Exchange Online, or SharePoint Online, as it’s similar to the messages shown during last weeks post. This time I’ll only show the end-user experience in the Company Portal app on a Windows 10 Desktop device and a Windows 10 Mobile device. The messages will be similar as shown below. It will not just show a non-compliant device, it will actually show which configuration is reported as not healthy by the Health Attestation Service.

Non-compliant Compliant
CA_Intune_CompanyPortal CA_Intune_CompanyPortal2
wp_ss_20160319_0001 wp_ss_20160319_0002

More information

For more information about conditional access, Windows 10 device health attestation and the HealthAttestation CSP, please refer to:

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