Onboard macOS devices with certificates using Addigy and SCEP

In this topic, you will learn how to deploy Portnox™ Cloud SCEP certificates via Addigy, SCEP, and iMazing Profile Editor to manage macOS devices.

Addigy lets you create simple profiles using the cloud user interface but does not let you create profiles with many payloads, which you need to connect to Portnox Cloud using SCEP. However, you can distribute custom profiles using Addigy, so you can create a custom profile and then use Addigy for management.

This topic shows you how to create a custom Apple profile for user-based authentication to connect to Portnox Cloud via Wi-Fi and Ethernet. We recommend that you use a free app called iMazing Profile Editor, but you can create a custom profile using a different tool or edit it manually in XML, if you prefer.

Important:

This topic shows the configuration for macOS computers with macOS 12 (Monterey), but the Apple profile payloads Certificate, SCEP, and WiFi, which are used in this configuration, are compatible with the following Apple operating systems: iOS 4.0+, iPadOS 4.0+, macOS 10.7+, tvOS 9.0+, watchOS 3.2+. This means that you can use the same profiles to configure other Apple devices based on these operating systems, for example, iPhones.

Turn on the Portnox Cloud SCEP services

In this section, you will configure Portnox™ Cloud to provide SCEP services to your devices.

If you have previously turned on the Portnox Cloud SCEP services, skip to the later step in which you get the Cloud SCEP URL and password.

Portnox Cloud SCEP services let devices contact the Cloud SCEP server and get a unique certificate for the device or for the specific user of the device.

Important:

In the Cloud portal top menu, click on the Settings option.
In the Cloud portal left-hand side menu, click on the Services > GENERAL SETTINGS > SCEP Services option.
Enable integration with SCEP services.
1. Click on the Edit link.
2. Activate the Enable integration checkbox.
3. Click on the Save button.
Click on the ⧉ icon next to the SCEP URL field to copy the SCEP URL, and paste it in a text file for later use.
Click on the ⧉ icon next to the Password field to copy the SCEP password, and paste it in a text file for later use.

Download the root CA certificate

In this section, you will download the root CA certificate from Portnox™ Cloud, which is needed to create a profile.

In the Cloud portal top menu, click on the Settings option.
In the Cloud portal left-hand side menu, click on the Services > CLOUD RADIUS SERVICE > Cloud RADIUS instance option.
Click on any of the RADIUS servers listed in the right-hand pane to show its configuration.
Click on the Download root certificate link.

Result: The root CA certificate file is in the Downloads folder on the local disk.

Download the tenant CA certificate

In this section, you will download the Portnox™ Cloud tenant CA certificate from the Cloud portal.

You need the tenant CA certificate from Portnox Cloud so that your managed devices can verify the validity of individual SCEP certificates, which are signed using the tenant CA certificate.

In the Cloud portal top menu, click on the Settings option.
In the Cloud portal left-hand side menu, click on the Services > GENERAL SETTINGS > Trusted Root Certificates option.
In the Trusted Root Certificates section, click on the Download CER link, then save the downloaded file.

The default name of the file is Your_tenant_name - Portnox CLEAR.cer, for example, Vorlon - Portnox CLEAR.cer.
Optional: Rename the downloaded file to tenantCertificate.cer. This is the name used in the next part of this guide.

Optional: Hand over information from the Portnox Cloud team to the Addigy team

In this section, you will learn what information was collected in previous steps from Portnox Cloud, which is needed to configure Addigy to work with Portnox Cloud.

If different people are responsible for managing Portnox Cloud and Addigy, here is the information you need to hand over:

The URL of the Portnox Cloud SCEP server. For example, https://scep.portnox.com/b2973887-1274-45d4-91d0-4a342a861c76.
The password for the SCEP server.
The root CA certificate file in the X.509 format. For example, rootCertificate.cer.
The tenant CA certificate file in the X.509 format. For example, tenantCertificate.cer.

Create the custom profile

In this section, you will use the iMazing Profile Editor to create an Apple profile for use in Addigy, which contains the following payloads: the root CA certificate, the tenant CA certificate, the SCEP configuration for user-based authentication, the Wi-Fi configuration, and the Global Ethernet configuration.

Note:

This guide shows the configuration on a macOS version of the iMazing Profile Editor, but you can also prepare the profile file using a Windows version of this application.

Install the iMazing Profile Editor and open it from the Launcher.

To install iMazing Profile Editor, follow the links from the iMazing website and the standard installation procedure in the operating system.

Note:
By default, when you run iMazing Profile Editor, it opens a new profile window and the General section. If not, select File > New from the top menu to open a new profile window.
In the right-hand side pane, in the Name section, enter a name for this profile.

We used the name Vorlon SCEP but you can use any name you like.
On the left-hand side of the profile window, scroll down to the Root Certificate icon, click on it, and in the right-hand side pane click on the Add Configuration Payload button.
In the file selector, locate and click on the root CA certificate file, downloaded as described in the previous section, and then click on the Open button.
Copy the value of the Payload UUID field and save it for later use.

You will need to add a reference to this root CA certificate in the Wi-Fi and Ethernet payloads later, so that the device can confirm the identity of the RADIUS server.

Note:
Make a note next to this value that says root CA UUID.
In the top-right corner of the right-hand side pane, click on the + button to add another root certificate payload.
In the file selector, locate and click on the tenant CA certificate file, downloaded and converted as described in the previous sections, and then click on the Open button.
Copy the value of the Payload UUID field and save it for later use.

You will need to add a reference to this tenant CA certificate in the Wi-Fi and Ethernet payloads later, so that the device can confirm the SCEP certificate validity.

Note:
Make a note next to this value that says tenant CA UUID.
On the left-hand side of the profile window, scroll down to the SCEP icon, click on it, and in the right-hand side pane click on the Add Configuration Payload button.
In the SCEP pane on the right-hand side, configure the following properties:
1. In the URL section, enter the SCEP URL that you copied earlier from Portnox Cloud.
2. In the Subject section, enter: CN={{.Fact "current_user"}}.
  
  Note:
  The .Fact format is specific to Addigy. This tag is processed by Addigy and replaced by the name of the currently logged-in user. The full list of Addigy facts is available in the Addigy documentation. Portnox Cloud then uses the user name from the certificate fields to create or align with an account in Cloud.
  
  At this time, Portnox Cloud does not support device-based authentication for Addigy. If you try to use Addigy facts related to device identifiers, Cloud will not be able to align this information with information from the authentication repository, and it will create new Portnox accounts for devices instead of aligning them with accounts from the authentication repository.
3. In the NT Principal Name section, enter: {{.Fact "current_user"}}.
  
  Note:
  By default, Portnox Cloud checks for user identity information in the SAN UPN field, which is identified as the NT Principal Name field in Addigy. To understand how Portnox Cloud matches the identity in the certificates with the authentication repository, read the following section: Certificate identity information.
4. In the Challenge section, enter the SCEP password that you copied earlier from Portnox Cloud.
  
  Important:
  Addigy does not support special characters in passwords.
5. In the Key Size section, select the key size that you want to use.
  
  In this example, we used the value 2048 but you can use 1024. Note that while higher values provide more security, they may cause certificate fragmentation problems in some network topologies. If such problems occur, see the following topic: Certificate fragmentation issues.
6. In the Key Usage section, select the Both signing and encryption option.
7. Copy the value in the Payload UUID and save it for later use.
  
  You will need to add a reference to this SCEP certificate in the Wi-Fi payload later, so that the device can confirm the SCEP certificate validity.
  
  Note:
  Make a note next to this value that says SCEP UUID.
On the left-hand side of the profile window, scroll down to the Wi-Fi icon, click on it, and in the right-hand side pane click on the Add Configuration Payload button.
In the Wi-Fi pane on the right-hand side, configure the following properties:
1. In the Service Set Identifier (SSID) section, enter the SSID of your Wi-Fi network.
2. In the Accept EAP Types section, click on the + button, click on the added entry, and select TLS.
3. In the Password field, enter any value (this value is ignored).
  
  This is necessary due to a bug in the iMazing Profile Editor. When you authenticate using TLS, the password is not used, but iMazing Profile Editor requires that you enter a password anyway.
  
  Note:
  The Wi-Fi profile has two Password sections. The one that requires a value is directly under the Accept EAP Types section.
4. In the Certificate Anchor UUID section, click on the + button twice, and in the new entry fields, paste the UUIDs that you copied earlier as root CA UUID and tenant CA UUID.
  
  You need a reference to the root CA certificate so that the device can confirm that the Portnox RADIUS server is authentic, and you need a reference to the tenant CA certificate so that the device can confirm the validity of the SCEP certificate for the current user or device.
5. In the Trusted Server Certificate Names section, click on the + button and in the new entry field, type clear-rad.portnox.com.
  
  Note:
  To learn more about this option, read the following topic: Trusted certificate server names.
6. In the Certificate UUID section, paste the UUID that you copied earlier as SCEP UUID.
7. Activate the Disable MAC address randomization during association checkbox.
  
  Important:
  If you do not turn off MAC address randomization, and the supplicant certificates are not issued by Portnox SCEP, and the certificate’s SAN field does not include a Jamf or Intune device ID, Portnox Cloud assigns a new license to the device each time it connects with a different MAC address. This can significantly increase your licensing costs. Even if you use Portnox SCEP and this issue does not apply, we still recommend turning MAC address randomization off for safety.
On the left-hand side of the profile window, scroll down to the 802.1X Ethernet: Global icon, click on it, and in the right-hand side pane click on the Add Configuration Payload button.

Note:
Depending on your hardware configurations, you can choose a different 802.1X Ethernet payload, for example, First Active Ethernet. The setup procedure is almost the same for all 802.1X payloads.
In the 802.1X Ethernet: Global pane on the right-hand side, configure the following properties:
1. In the Accept EAP Types section, click on the + button, click on the added entry, and select TLS.
2. In the Password field, enter any value (this value is ignored).
  
  This is necessary due to a bug in the iMazing Profile Editor. When you authenticate using TLS, the password is not used, but iMazing Profile Editor requires that you enter a password anyway.
3. In the Certificate Anchor UUID section, click on the + button twice, and in the new entry fields, paste the UUIDs that you copied earlier as root CA UUID and tenant CA UUID.
  
  You need a reference to the root CA certificate so that the device can confirm that the Portnox RADIUS server is authentic, and you need a reference to the tenant CA certificate so that the device can confirm the validity of the SCEP certificate for the current user or device.
4. In the Trusted Server Certificate Names section, click on the + button and in the new entry field, type clear-rad.portnox.com.
  
  Note:
  To learn more about this option, read the following topic: Trusted certificate server names.
5. In the Interface section, select the Any Ethernet option.
In the top menu of iMazing Profile Editor, select File > Save, and select a location to save the profile.

Result: The custom profile file (.mobileconfig) is saved on the disk and ready for use in Addigy.

Add the custom profile to Addigy

In this section, you will upload the custom profile file to Addigy and assign it to an existing policy, so that Addigy can distribute it to managed devices.

Log in to your Addigy account by visiting app.addigy.com.
In the main Addigy menu on the left-hand side, click on the Catalog option, and then in the right-hand side pane, click on the MDM Profiles heading.

You can also open the following URL in your browser: app.addigy.com/catalog/profiles.
Click on the New button on the right-hand side above the list of profiles.
Click on the Custom Profile button in the top-right corner of the right-hand side pane.
In the Custom Profile pane, leave the default values or modify them as needed, and click on the Select .mobileconfig file button. Then, select the custom profile file that you prepared earlier.
Scroll down the pane that contains profile details, and in the bottom-right corner, click on the Create button.
In the list of profiles, click on the … menu icon next to the newly created profile name, and select the Assignments option.
In the Item Policies window, select the policies that you want to assign this profile to, and then click on the Save button.

Note:

If you configured an Ethernet payload for your profile, and distributed this profile to your managed devices, the first time that the user of the managed device connects to the Ethernet, they may be asked to select the connection profile (to choose between Wi-Fi and 802.1X Global Ethernet) and the certificate to use (to choose between the Addigy certificate and their SCEP certificate). This is a standard behavior for macOS and it cannot be modified by the profile.