Microsoft Intune allows third-party certificate authorities (CA) to issue and validate certificates using the Simple Certificate Enrollment Protocol (SCEP). SCEPman is a fully unattended Certificate Authority using Azure Key Vault for Microsoft Intune based device certificate deployment. SCEPman is an Azure Web App providing the SCEP and Intune API. It uses an Azure Key Vault based Root CA and certificate signing. No other component is involved, neither a database nor any other stateful storage except the Azure Key Vault. That said, SCEPman will not need any backup procedures.
SCEPman is an Azure Web App with the following features:
- A SCEP interface that is compatible with the Intune SCEP open-source API in particular
- SCEPman signs machine authentication certificates with a CA key stored in Azure Key Vault
- SCEPman contains an OCSP responder to provide certificate validity in real-time. A certificate is valid if its corresponding AAD device exists and is enabled
SCEPman issues machine authentication certificates that are compatible with Intune’s internally used authentication certificates. They contain Intune’s extensions determining the tenant and the machine. Additionally, the tenant ID and machine ID is stored in the certificate subject to allow common Radius servers like Cisco ISE, FreeRADIUS, RADIUS-as-a-Service and others to use these certificates for authentication.
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