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.
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.
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.
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.
Note: In Microsoft Intune standalone similar reports are available, in the Reports section, named Health Attestation Reports.
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|
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.
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.
For more information about conditional access, Windows 10 device health attestation and the HealthAttestation CSP, please refer to:
- Health attestation for System Center Configuration Manager: https://technet.microsoft.com/en-us/library/mt651779.aspx
- Control the health of Windows 10-based devices: https://technet.microsoft.com/library/mt592023.aspx
- HealthAttestation CSP: https://msdn.microsoft.com/library/dn934876.aspx
- Manage device compliance policies in System Center Configuration Manager: https://technet.microsoft.com/en-us/library/mt629503.aspx
- Manage device compliance policies for Microsoft Intune: https://technet.microsoft.com/en-us/library/dn705843.aspx
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