OvmfPkg/EnrollDefaultKeys: extract MICROSOFT_VENDOR_GUID

The GUID

  77FA9ABD-0359-4D32-BD60-28F4E78F784B

is specified in MSDN, at
<https://msdn.microsoft.com/en-us/ie/dn932805(v=vs.94)>, therefore it
deserves an entry in the package DEC file, and a header file under
"Include/Guid".

(Arguably, this GUID declaration / definition could even live under
SecurityPkg, but the edk2 tradition has been to hoist GUIDs,
protocols/PPIs, and lib classes from OvmfPkg to a core package only when
dependent C code is added to the core package.)

Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Julien Grall <julien.grall@arm.com>
Bugzilla: https://bugzilla.tianocore.org/show_bug.cgi?id=1747
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Gary Lin <glin@suse.com>

OvmfPkg/Include/Guid/MicrosoftVendor.h

@@ -0,0 +1,55 @@
+/** @file
+  Declare the GUID that is expected:
+
+  - as EFI_SIGNATURE_DATA.SignatureOwner GUID in association with X509 and
+    RSA2048 Secure Boot certificates issued by/for Microsoft,
+
+  - as UEFI variable vendor GUID in association with (unspecified)
+    Microsoft-owned variables.
+
+  Copyright (C) 2014-2019, Red Hat, Inc.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+  @par Specification Reference:
+  - MSDN: System.Fundamentals.Firmware at
+    <https://msdn.microsoft.com/en-us/ie/dn932805(v=vs.94)>.
+**/
+
+#ifndef MICROSOFT_VENDOR_H_
+#define MICROSOFT_VENDOR_H_
+
+#include <Uefi/UefiBaseType.h>
+
+//
+// The following test cases of the Secure Boot Logo Test in the Microsoft
+// Hardware Certification Kit:
+//
+// - Microsoft.UefiSecureBootLogo.Tests.OutOfBoxVerifyMicrosoftKEKpresent
+// - Microsoft.UefiSecureBootLogo.Tests.OutOfBoxConfirmMicrosoftSignatureInDB
+//
+// expect the EFI_SIGNATURE_DATA.SignatureOwner GUID to be
+// 77FA9ABD-0359-4D32-BD60-28F4E78F784B, when the
+// EFI_SIGNATURE_DATA.SignatureData field carries any of the following X509
+// certificates:
+//
+// - "Microsoft Corporation KEK CA 2011" (in KEK)
+// - "Microsoft Windows Production PCA 2011" (in db)
+// - "Microsoft Corporation UEFI CA 2011" (in db)
+//
+// This is despite the fact that the UEFI specification requires
+// EFI_SIGNATURE_DATA.SignatureOwner to reflect the agent (i.e., OS,
+// application or driver) that enrolled and therefore owns
+// EFI_SIGNATURE_DATA.SignatureData, and not the organization that issued
+// EFI_SIGNATURE_DATA.SignatureData.
+//
+#define MICROSOFT_VENDOR_GUID                           \
+  { 0x77fa9abd,                                         \
+    0x0359,                                             \
+    0x4d32,                                             \
+    { 0xbd, 0x60, 0x28, 0xf4, 0xe7, 0x8f, 0x78, 0x4b }, \
+  }
+
+extern EFI_GUID gMicrosoftVendorGuid;
+
+#endif /* MICROSOFT_VENDOR_H_ */