azure-snp-report-verify

README

Obtain current Azure SNP ID key digest & firmware versions

On Azure, Constellation verifies that the SNP attestation report contains Azure's ID key digest. Additionally, some firmware security version numbers (SVNs) are validated. Currently, the only way to verify the digest's origin is to perform guest attestation with the help of the Microsoft Azure Attestation (MAA) service. There's a sample on how to do this, but it's not straightforward. So we created tooling to make things easier.

Perform the following steps to get the ID key digest & firmware versions:

1. Create an Ubuntu CVM on Azure with secure boot enabled and ssh into it.
2. Run

   docker run --rm --privileged -v/sys/kernel/security:/sys/kernel/security ghcr.io/edgelesssys/constellation/azure-snp-reporter
   

   This executes the guest attestation and prints the JWT received from the MAA. (It's the long base64 blob.)
3. Copy the JWT and run on your local trusted machine:

   go run verify.go <jwt>
   

   On success it prints the ID key digest and relevant firmware SVNs.

Documentation

Overview

Verify verifies an MAA JWT and prints the SNP ID key digest on success.