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Meraki - RADIUS (NPS) Auth - AAD Devices & Certificates

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Meraki - RADIUS (NPS) Auth - AAD Devices & Certificates

Hi all. 

 

We've taken on a new client to roll out a bunch of Azure AD joined clients to the users. As part of this they will need to use their Meraki WiFi solution.

The Meraki is currently configured to use Radius on a  Windows 2019 Server with NPS installed. There is an on premise AD which is synced down to Azure AD. The Radius server is currently configured to use the on premise Domain Users group for authentication. However to prevent personal devices being joined to the WiFi network using their AD creds the client wishes to use certficates to authenticate instead. 

We have an internal CA and the root certificate is installed on all clients via InTune. 

It seems the we potentially need to deploy PKCS certificates via InTune and leverage the InTune Certificate Connector to sit betweeen the CA and InTune. 

However the part of this I'm struggling with and can't seem to find any information on is the actual connection between the certificates deployed via InTune and the Certificate Connector and the Radius Server authentication. 

So basically we can get certificates to the clients but how does the Radius server know to authenticate them?


Any thoughts?

 

Thanks

4 REPLIES 4
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Head in the Cloud

Re: Meraki - RADIUS (NPS) Auth - AAD Devices & Certificates

I'm no expert on the matter but the basics things I know:

1) Your clients will be configured through intune with the SSID to connect to using WPA2-Enterprise and EAP-TLS and the correct certificate to use.  Also if it's using machine or user auth or both depending on login screen or logged in.

2) When the client connects the AP will transmit the radius attributes service-type:framed (for dot1x) and a called-station-id which contains SSID and AP MAC address.  The client will also transmit it wants to do EAP-TLS.

3) The NPS server would have been configured with:
A list of IP's or radius clients (the AP's) or a subnet where the AP's live
The policy where it matches on service-type framed and called-station-id containing the SSID, and EAP-TLS as auth method.
The fields to look at in the certificate mostly common name and the attributes containing the AD group.

4) NPS sends it's cert to the client which is signed by the same CA, so the client trusts the NPS server
5) The client sets up the TLS connection and sends it cert over it containing all necessary fields
6) NPS evaluates and sends access-accept with attributes or access-reject if something is wrong

If I'm mistaken somewhere, please correct me 😉

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Kind of a big deal

Re: Meraki - RADIUS (NPS) Auth - AAD Devices & Certificates

Be prepared for a lot of work.  Microsoft has made the configuration you describe really hard.

 

You'll need to configure Intune to issue certificates from the on-premise CA server using SCEP/NDES.  These certificates are authenticated against the user in AD (they have the username embedded in the certificate).

 

When the user connects to WiFi and presents their certificate RADIUS extracts out the username and then continues to process as normal.

 

 

This is a lot of work to deploy and get working.  I'm waiting for Trusted Access to add support for Windows 10 so I can forget this nightmare.

https://documentation.meraki.com/zGeneral_Administration/Cross-Platform_Content/Trusted_Access_for_S... 

 

Actually, I think you could do this via Meraki Systems Manager (which you would have to buy).  You can only enrol a Windows 10 machine in one MDM at a time - and you have already enrolled in Intune - but I think if you used Intune to deploy the Meraki Systems Manager agent you could then use the Meraki Agent to deploy Meraki certificates onto the machines for authentication, all automated.  It would also configure the WiFi settings on the machine.

https://documentation.meraki.com/zGeneral_Administration/Cross-Platform_Content/Configuring_EAP-TLS_... 

I'd be tempted by this approach because the Microsoft method is such a lot of work.

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Just browsing

Re: Meraki - RADIUS (NPS) Auth - AAD Devices & Certificates

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New here

Re: Meraki - RADIUS (NPS) Auth - AAD Devices & Certificates

Hello,

 

To deploy user and device certificates you can deploy PKCS certificates. This is easy to do. What you need is to download the PKCS certificate connector. You can find it when you go to the intune portal and Device configuration | Certificate connectors. Click on Add and download the PKCS certificate connector.

Go to an on-prem server which is in the same domain as the internal CA server. Don't worry, connection with the certificate connector will be as save encrypted tunnel so no complex firewall settings or other things to worry about.

Install the certificate connector and only PKCS have to be installed. If SCEP is applicable you can choose for PKCS ans SCEP during the setup steps of the connector.

 

After installing start the connector. If starting the app later, run the connector as admin.

Make sure you have a Azure global admin with an Intune (EM+S) license activated. If not do so but it will take some time before this is active, at least 15 min.

In the certificate connector login with the Azure Global Admin, and you are finished. You can see in Intune a green check that the connector is up and running.

 

Next is to create a certificate connector which has the correct certificate requirements. For Intune I believe you have 2 requirements to make sure you can enroll the certificate and that is under Subject Name: Supply in the request, and at permissions, add the server which has the certificate connector installed the read and enroll certificate permissions. I think that is it but be sure to look online for advise when deploying the certificates with Intune.

 

I used this method for always on vpn configurations and WPA2 Enterprise PEAP Wifi Configurations based on user certificates.

Hopefully this helps.

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