Windows 10: Which Windows Hello for Business deployments / Trust do you recommend?

Rachid Ouedraogo · Feb 16, 2023

I intend to incorporate WHFB to the office.Unfortunately, I can't find any reliable information about the various deployments/trust.Can you tell me the advantages and disadvantages of each deployment?

:)

Brink · Feb 16, 2023

Passwordless RDP with Windows Hello for Business

Windows Hello for Business (WHfB) provides a password-less experience for users to log into their Windows 10 or 11 device. However, a challenge remains when accessing remote systems. This can be via MMC console for example to access Active Directory Users and Computers. Or RDP access onto a remote server. We still need to provide a password to run these tools. How do we protect these credentials from compromise? This is where we can use a combination of WHfB dual enrolment with a certificate deployed to the WHfB container protected with the users PIN/Biometrics.

The end goal will be that we can log on with our high privilege user, enrol in WHfB, obtain a certificate that can be used for RDP access, save this certificate in our protected WHfB container and use this when logged on with a low privilege user. This can give us a passwordless RDP and remote admin console experience.

I don't want to re-invent the wheel, so this guide will be pulling together a couple of guides already in the WHfB deployment guides into a single solution with an overview of how to use the solution.

Note: Microsoft recommends that the best way to protect your high privilege credentials is to use a Privileged Access Workstation. Not exposing high privilege credentials on systems that are a target for attack removes the risk of those credentials being compromised. This article does not supersede that advice in anyway. But offers an alternative way to protect high privilege credentials.

Extra care should be taken when syncing high privilege accounts to AAD. Do not sync Domain Admin accounts for example. Please refer to Microsoft's "Securing privileged access Enterprise access model" for further information.

Out of Scope

Deploying the components for WHfB is out of scope for this guide. It is assumed this is already deployed and the reader understands how to enrol a user in WHfB via GPO or Intune. If you have not already deployed WHfB, please start here Windows Hello for Business Deployment Overview - Windows security | Microsoft Docs

1. Requirements

Pre-requisites:

Hybrid joined windows 10/11 computer

PKI with a modified certificate template issued

Dual enrolment configured via GPO

Standard and high privileged user synchronised to azure AD.

2. Deploying Certificates to Key Trust Users

Use this guide, Deploying Certificates to Key Trust Users to Enable RDP - Windows security | Microsoft Docs, to setup the required certificate on your PKI.

Key points:

Duplicate the smartcard logon certificate

Modify template to save the certificate into the “Microsoft Passport Key Storage Provider”

Note 1: Only complete the “Create a Windows Hello for Business certificate template”. Do not complete the “Requesting a certificate” stage just yet. The high privilege user will complete this.
Note 2: You can apply a security group to this new certificate template. Make sure you place your admin users into this group.

3. Deploy Dual enrolment settings

We will use this guide Dual Enrolment - Windows security | Microsoft Docs to setup dual enrolment. The key points here are:

A modification to AdminSDHolder

GPO to enable “Allow enumeration of emulated smart cards for all users”

Note: The GPO is a computer-based policy. Make sure you are scoping this to include the computer objects of your admin users.

4. Enrolling users

Once we have deployed the certificate template to our PKI and enabled the dual enrolment settings on our target PCs, we can now enrol the high privilege and low privilege user.
Note: The “allow enumeration of emulated smart cards for all users” setting needs to be in place before we enrol any user. If you have already enrolled your normal user for WHfB, then we need to remove this. We use a certutil command for this:

Certutil -deletehellocontainer

4.1 Admin user hello enrolment and certificate enrolment

Sign in using your high privilege user and complete the windows hello for business enrolment. For security reasons, make sure to use a different pin than you will use for your standard user account.

Using the section “Requesting a certificate” from the guide, Deploying Certificates to Key Trust Users to Enable RDP - Windows security | Microsoft Docs obtain the high privilege user certificate.

Once enrolled, you will new see a new cert in the personal store, alongside your WHfB certificate, plus any other certificates issued by your environment.

4.2 Standard user WHfB enrolment

Sign back in as the standard user and complete the WHfB enrolment.

Done

Note. We do not need to enrol a certificate for this user. This user should not be doing using RDP with these credentials.

5. Effect of “Allow enumeration of emulated smart cards for all users” setting

Open the MMC.exe and add the certificate snap in. We will now see the certificate of the admin user in our personal store along with our own WHfB certificate. This allows us to select this certificate for authentication.

Windows 10 allows for up to WHfB enrolments per device. This will allow multiple certificates to be issued and used by the standard user.

As you can see here, an additional three users have been enrolled and their WHfB protected certificates are available for use.

6. How to use the admin certificate

We can use this certificate for two purposes.

Signing into an RDP session

Launching an application as another user like an MMC console or an RSAT tool

6.1 Signing into an RDP session

When we need to enter credentials for an RDP session, selecting more choices, the admin user is available for selection because the certificate is in our personal store. Simply select the credential and enter the pin we setup during the admin user enrolment.

6.2 Launching application as another user like an MMC console or an RSAT tool

When we select run as different user, we will then get the option to select the admin credential under more choices. When we select that credential, we will be asked to provide the pin we setup during the hello enrolment for that user.

Conclusion

Using this method, we have achieved passwordless multi factor authentication for RDP and remote admin tools. This is MFA because the something we have is the device where the certificates are stored and the something we know is the PIN used to unlock the keys in the TPM to use these certificates. We are protecting these credentials as we are not exposing their passwords to potentially targeted and compromised machines.

I hope you can see the benefit in using an approach like this. Thank you for reading and please leave a comment below if you have any questions.
Click to expand...

Source: https://techcommunity.microsoft.com/...s/ba-p/3317287

Matias Keib · Feb 16, 2023

Deployed Windows hello for Business with cloud trust, Forti does not recognize the affected users's login

Hello guys!

I hope you're all doing great!

So, I have deployed Windows Hello for Business using Cloud Trust Authentication on a client's environment (I had previously Hybrid domain joined their users and devices and subsequently deployed co-management as they have config manager). We went through all the steps as per described by MS Docs and the deployment worked as expected: One would login to the device and then never had any other form of authentication requested again (Upon accessing to MS 365 apps).

So far so good, but little did I know the client has Forti Guard for proxied addresses. After some investigation on their side, they concluded that Forti guard cannot read the security event for Logon 4624, so when the user tries to access anything that isn't related to MS (They whitelisted all MS Services IP's) they would get a certificate error as Forti Guard does not have any registered user for that logon (The one performed through Windows hello for business).

Is there any chance that since the authentication is happening on the Cloud, on prem services is not seeing it? I reckon that having AD Connect synchronize both domains (cloud + on prem) should prevent this from happening but maybe there's something we are not seeing here.

Thank you very much in advance!

Arjay Dom · Feb 16, 2023

constant hangs, Windows hello for business.

Hi Wesley,

The issue with Windows Hello for Business will require some advanced troubleshooting steps to be resolved.

We recommend posting the issue on TechNet for proper guidance and resolutions.

Let us know if you have any other concerns.

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