fix(migtd/migration): restrict GetTDReport to emulation builds#970
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GetTDReport returns a MAC-valid TDREPORT over a VMM-chosen REPORTDATA, giving the host VMM a signing oracle over MigTD's identity (sighting-16709). Combined with the rebinding TDREPORT relay this enables unauthenticated rebinding approval on a same-platform NEW MigTD (sighting-16711). No production migration or rebinding flow requires the VMM to invoke GetTDReport; all legitimate TDREPORT generation is MigTD-initiated during the RA-TLS handshake. Gate the request dispatch on the AzCVMEmu emulation feature and reject the operation as UnsupportedOperationError in production builds, removing the oracle at its source. Signed-off-by: Przemyslaw Sidor <przemyslaw.sidor@intel.com> Assisted-by: GitHub Copilot:claude-opus-4-8
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GetTDReport returns a MAC-valid TDREPORT over a VMM-chosen REPORTDATA, giving the host VMM a signing oracle over MigTD's identity (sighting-16709). Combined with the rebinding TDREPORT relay this enables unauthenticated rebinding approval on a same-platform NEW MigTD (sighting-16711).
No production migration or rebinding flow requires the VMM to invoke GetTDReport; all legitimate TDREPORT generation is MigTD-initiated during the RA-TLS handshake. Gate the request dispatch on the AzCVMEmu emulation feature and reject the operation as UnsupportedOperationError in production builds, removing the oracle at its source.
Assisted-by: GitHub Copilot:claude-opus-4-8