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config: support latest as version value for Azure SEVSNP (#1786)
* support latest as version value
This commit is contained in:
Adrian Stobbe
GitHub
parent
b86b52a598
commit
cfef384f36
8 changed files with 419 additions and 295 deletions
228
internal/config/azure.go
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228
internal/config/azure.go
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@ -0,0 +1,228 @@
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/*
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Copyright (c) Edgeless Systems GmbH
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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package config
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import (
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"bytes"
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"fmt"
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"strconv"
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"strings"
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"github.com/edgelesssys/constellation/v2/internal/attestation/idkeydigest"
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"github.com/edgelesssys/constellation/v2/internal/attestation/measurements"
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"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
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"github.com/edgelesssys/constellation/v2/internal/config/snpversion"
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"github.com/edgelesssys/constellation/v2/internal/variant"
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)
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// AzureSEVSNP is the configuration for Azure SEV-SNP attestation.
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type AzureSEVSNP struct {
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// description: |
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// Expected TPM measurements.
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Measurements measurements.M `json:"measurements" yaml:"measurements" validate:"required,no_placeholders"`
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// description: |
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// Lowest acceptable bootloader version.
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BootloaderVersion uint8 `json:"bootloaderVersion" yaml:"bootloaderVersion"`
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// description: |
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// Lowest acceptable TEE version.
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TEEVersion uint8 `json:"teeVersion" yaml:"teeVersion"`
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// description: |
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// Lowest acceptable SEV-SNP version.
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SNPVersion uint8 `json:"snpVersion" yaml:"snpVersion"`
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// description: |
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// Lowest acceptable microcode version.
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MicrocodeVersion uint8 `json:"microcodeVersion" yaml:"microcodeVersion"`
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// description: |
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// Configuration for validating the firmware signature.
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FirmwareSignerConfig SNPFirmwareSignerConfig `json:"firmwareSignerConfig" yaml:"firmwareSignerConfig"`
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// description: |
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// AMD Root Key certificate used to verify the SEV-SNP certificate chain.
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AMDRootKey Certificate `json:"amdRootKey" yaml:"amdRootKey"`
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}
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// DefaultForAzureSEVSNP returns the default configuration for Azure SEV-SNP attestation.
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// Version numbers are hard coded and should be updated with each new release.
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func DefaultForAzureSEVSNP() *AzureSEVSNP {
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return &AzureSEVSNP{
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Measurements: measurements.DefaultsFor(cloudprovider.Azure, variant.AzureSEVSNP{}),
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BootloaderVersion: snpversion.GetLatest(snpversion.Bootloader),
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TEEVersion: snpversion.GetLatest(snpversion.TEE),
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SNPVersion: snpversion.GetLatest(snpversion.SNP),
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MicrocodeVersion: snpversion.GetLatest(snpversion.Microcode),
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FirmwareSignerConfig: SNPFirmwareSignerConfig{
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AcceptedKeyDigests: idkeydigest.DefaultList(),
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EnforcementPolicy: idkeydigest.MAAFallback,
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},
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// AMD root key. Received from the AMD Key Distribution System API (KDS).
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AMDRootKey: mustParsePEM(`-----BEGIN CERTIFICATE-----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\nAFZEAwoKCQ==\n-----END CERTIFICATE-----\n`),
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}
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}
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// GetVariant returns azure-sev-snp as the variant.
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func (AzureSEVSNP) GetVariant() variant.Variant {
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return variant.AzureSEVSNP{}
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}
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// GetMeasurements returns the measurements used for attestation.
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func (c AzureSEVSNP) GetMeasurements() measurements.M {
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return c.Measurements
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}
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// SetMeasurements updates a config's measurements using the given measurements.
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func (c *AzureSEVSNP) SetMeasurements(m measurements.M) {
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c.Measurements = m
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}
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// EqualTo returns true if the config is equal to the given config.
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func (c AzureSEVSNP) EqualTo(old AttestationCfg) (bool, error) {
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otherCfg, ok := old.(*AzureSEVSNP)
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if !ok {
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return false, fmt.Errorf("cannot compare %T with %T", c, old)
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}
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firmwareSignerCfgEqual := c.FirmwareSignerConfig.EqualTo(otherCfg.FirmwareSignerConfig)
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measurementsEqual := c.Measurements.EqualTo(otherCfg.Measurements)
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bootloaderEqual := c.BootloaderVersion == otherCfg.BootloaderVersion
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teeEqual := c.TEEVersion == otherCfg.TEEVersion
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snpEqual := c.SNPVersion == otherCfg.SNPVersion
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microcodeEqual := c.MicrocodeVersion == otherCfg.MicrocodeVersion
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rootKeyEqual := bytes.Equal(c.AMDRootKey.Raw, otherCfg.AMDRootKey.Raw)
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return firmwareSignerCfgEqual && measurementsEqual && bootloaderEqual && teeEqual && snpEqual && microcodeEqual && rootKeyEqual, nil
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}
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// UnmarshalYAML implements a custom unmarshaler to support setting "latest" as version.
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func (c *AzureSEVSNP) UnmarshalYAML(unmarshal func(any) error) error {
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aux := &fusedAzureSEVSNP{
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auxAzureSEVSNP: (*auxAzureSEVSNP)(c),
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}
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if err := unmarshal(aux); err != nil {
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return fmt.Errorf("unmarshal AzureSEVSNP: %w", err)
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}
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c = (*AzureSEVSNP)(aux.auxAzureSEVSNP)
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for _, versionType := range []snpversion.Type{snpversion.Bootloader, snpversion.TEE, snpversion.SNP, snpversion.Microcode} {
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if !convertLatestToNumber(c, versionType, aux) {
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if err := convertStringToUint(c, versionType, aux); err != nil {
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return fmt.Errorf("convert %s version to number: %w", versionType, err)
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}
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}
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}
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return nil
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}
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// AzureTrustedLaunch is the configuration for Azure Trusted Launch attestation.
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type AzureTrustedLaunch struct {
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// description: |
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// Expected TPM measurements.
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Measurements measurements.M `json:"measurements" yaml:"measurements" validate:"required,no_placeholders"`
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}
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// GetVariant returns azure-trusted-launch as the variant.
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func (AzureTrustedLaunch) GetVariant() variant.Variant {
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return variant.AzureTrustedLaunch{}
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}
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// GetMeasurements returns the measurements used for attestation.
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func (c AzureTrustedLaunch) GetMeasurements() measurements.M {
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return c.Measurements
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}
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// SetMeasurements updates a config's measurements using the given measurements.
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func (c *AzureTrustedLaunch) SetMeasurements(m measurements.M) {
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c.Measurements = m
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}
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// EqualTo returns true if the config is equal to the given config.
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func (c AzureTrustedLaunch) EqualTo(other AttestationCfg) (bool, error) {
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otherCfg, ok := other.(*AzureTrustedLaunch)
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if !ok {
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return false, fmt.Errorf("cannot compare %T with %T", c, other)
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}
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return c.Measurements.EqualTo(otherCfg.Measurements), nil
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}
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// auxAzureSEVSNP is a helper struct for unmarshaling the config from YAML for handling the version parsing.
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// The version fields are kept to make it convertable to the native AzureSEVSNP struct.
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type auxAzureSEVSNP struct {
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// description: |
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// Expected TPM measurements.
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Measurements measurements.M `json:"measurements" yaml:"measurements" validate:"required,no_placeholders"`
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// description: |
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// Lowest acceptable bootloader version.
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BootloaderVersion uint8 `yaml:"-"`
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// description: |
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// Lowest acceptable TEE version.
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TEEVersion uint8 `json:"teeVersion" yaml:"-"`
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// description: |
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// Lowest acceptable SEV-SNP version.
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SNPVersion uint8 `json:"snpVersion" yaml:"-"`
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// description: |
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// Lowest acceptable microcode version.
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MicrocodeVersion uint8 `json:"microcodeVersion" yaml:"-"`
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// description: |
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// Configuration for validating the firmware signature.
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FirmwareSignerConfig SNPFirmwareSignerConfig `json:"firmwareSignerConfig" yaml:"firmwareSignerConfig"`
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// description: |
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// AMD Root Key certificate used to verify the SEV-SNP certificate chain.
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AMDRootKey Certificate `json:"amdRootKey" yaml:"amdRootKey"`
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}
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// fusedAzureSEVSNP is a helper struct for unmarshaling the config from YAML for handling the version parsing.
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type fusedAzureSEVSNP struct {
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*auxAzureSEVSNP `yaml:",inline"`
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// description: |
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// Lowest acceptable bootloader version.
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BootloaderVersion string `yaml:"bootloaderVersion"`
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// description: |
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// Lowest acceptable bootloader version.
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TEEVersion string `yaml:"teeVersion"`
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// description: |
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// Lowest acceptable bootloader version.
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SNPVersion string `yaml:"snpVersion"`
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// description: |
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// Lowest acceptable bootloader version.
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MicrocodeVersion string `yaml:"microcodeVersion"`
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}
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func convertStringToUint(c *AzureSEVSNP, versionType snpversion.Type, aux *fusedAzureSEVSNP) error {
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v, stringV := getUintAndStringPtrToVersion(c, versionType, aux)
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bvInt, err := strconv.ParseInt(*stringV, 10, 8)
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if err != nil {
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return err
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}
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*v = uint8(bvInt)
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return nil
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}
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func convertLatestToNumber(c *AzureSEVSNP, versionType snpversion.Type, aux *fusedAzureSEVSNP) bool {
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v, stringV := getUintAndStringPtrToVersion(c, versionType, aux)
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if strings.ToLower(*stringV) == "latest" {
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*v = snpversion.GetLatest(versionType)
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return true
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}
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return false
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}
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func getUintAndStringPtrToVersion(c *AzureSEVSNP, versionType snpversion.Type, aux *fusedAzureSEVSNP) (versionUint *uint8, versionString *string) {
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switch versionType {
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case snpversion.Bootloader:
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versionUint = &c.BootloaderVersion
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versionString = &aux.BootloaderVersion
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case snpversion.TEE:
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versionUint = &c.TEEVersion
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versionString = &aux.TEEVersion
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case snpversion.SNP:
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versionUint = &c.SNPVersion
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versionString = &aux.SNPVersion
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case snpversion.Microcode:
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versionUint = &c.MicrocodeVersion
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versionString = &aux.MicrocodeVersion
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}
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return
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}
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