config: support latest as version value for Azure SEVSNP (#1786)

* support latest as version value

internal/config/qemu.go

@@ -0,0 +1,76 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package config
+
+import (
+	"fmt"
+
+	"github.com/edgelesssys/constellation/v2/internal/attestation/measurements"
+	"github.com/edgelesssys/constellation/v2/internal/variant"
+)
+
+// QEMUVTPM is the configuration for QEMU vTPM attestation.
+type QEMUVTPM struct {
+	// description: |
+	//   Expected TPM measurements.
+	Measurements measurements.M `json:"measurements" yaml:"measurements" validate:"required,no_placeholders"`
+}
+
+// GetVariant returns qemu-vtpm as the variant.
+func (QEMUVTPM) GetVariant() variant.Variant {
+	return variant.QEMUVTPM{}
+}
+
+// GetMeasurements returns the measurements used for attestation.
+func (c QEMUVTPM) GetMeasurements() measurements.M {
+	return c.Measurements
+}
+
+// SetMeasurements updates a config's measurements using the given measurements.
+func (c *QEMUVTPM) SetMeasurements(m measurements.M) {
+	c.Measurements = m
+}
+
+// EqualTo returns true if the config is equal to the given config.
+func (c QEMUVTPM) EqualTo(other AttestationCfg) (bool, error) {
+	otherCfg, ok := other.(*QEMUVTPM)
+	if !ok {
+		return false, fmt.Errorf("cannot compare %T with %T", c, other)
+	}
+	return c.Measurements.EqualTo(otherCfg.Measurements), nil
+}
+
+// QEMUTDX is the configuration for QEMU TDX attestation.
+type QEMUTDX struct {
+	// description: |
+	//   Expected TDX measurements.
+	Measurements measurements.M `json:"measurements" yaml:"measurements" validate:"required,no_placeholders"`
+}
+
+// GetVariant returns qemu-tdx as the variant.
+func (QEMUTDX) GetVariant() variant.Variant {
+	return variant.QEMUTDX{}
+}
+
+// GetMeasurements returns the measurements used for attestation.
+func (c QEMUTDX) GetMeasurements() measurements.M {
+	return c.Measurements
+}
+
+// SetMeasurements updates a config's measurements using the given measurements.
+func (c *QEMUTDX) SetMeasurements(m measurements.M) {
+	c.Measurements = m
+}
+
+// EqualTo returns true if the config is equal to the given config.
+func (c QEMUTDX) EqualTo(other AttestationCfg) (bool, error) {
+	otherCfg, ok := other.(*QEMUTDX)
+	if !ok {
+		return false, fmt.Errorf("cannot compare %T with %T", c, other)
+	}
+	return c.Measurements.EqualTo(otherCfg.Measurements), nil
+}