attestationreport: snp log messages

Signed-off-by: Simon Ott <simon.ott@aisec.fraunhofer.de>

Author: smo4201

attestationreport/validationreport.go

@@ -830,15 +830,20 @@ func (r *VerificationResult) PrintErr() {
 		m.Summary.PrintErr("%v", m.Type)
 		m.Freshness.PrintErr("Measurement freshness check")
 		m.Signature.PrintErr("Measurement")
-		for _, a := range m.Artifacts {
+		for i, a := range m.Artifacts {
 			if !a.Success {
-				header := ""
-				if m.Type == "TPM Result" {
-					header = fmt.Sprintf("PCR%v ", a.Index)
-				} else if m.Type == "TDX Result" {
-					header = fmt.Sprintf("%v ", internal.IndexToMr(a.Index))
+				var header string
+				switch m.Type {
+				case "TPM Result":
+					header = fmt.Sprintf("PCR%v Measurement", a.Index)
+				case "TDX Result":
+					header = fmt.Sprintf("%v Measurement", internal.IndexToMr(a.Index))
+				case "SNP Result":
+					header = "SNP Measurement"
+				default:
+					header = fmt.Sprintf("%v Measurement", m.Type)
 				}
-				log.Warnf("%vMeasurement %v: %v verification failed", header, a.SubType, a.Digest)
+				log.Warnf("%v %q: %v verification failed (Artifact %v)", header, a.SubType, a.Digest, i)
 			}
 		}
 		if m.TpmResult != nil {

verifier/snp.go

@@ -172,7 +172,8 @@ func verifySnpMeasurements(measurement ar.Measurement, nonce []byte, manifests [
 
 	// Compare Measurements
 	if cmp := bytes.Compare(s.Measurement[:], snpReferenceValue.Sha384); cmp != 0 {
-		log.Debug("Failed to verify SNP reference value")
+		log.Debugf("Failed to verify SNP reference value. Expected %x, got %x",
+			snpReferenceValue.Sha384, s.Measurement[:])
 		result.Artifacts = append(result.Artifacts,
 			ar.DigestResult{
 				Type:     "Reference Value",