constellation/internal/config/azure.go

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/*
Copyright (c) Edgeless Systems GmbH
SPDX-License-Identifier: AGPL-3.0-only
*/
package config
import (
"bytes"
"context"
"fmt"
"github.com/edgelesssys/constellation/v2/internal/api/attestationconfigapi"
"github.com/edgelesssys/constellation/v2/internal/attestation/idkeydigest"
"github.com/edgelesssys/constellation/v2/internal/attestation/measurements"
"github.com/edgelesssys/constellation/v2/internal/attestation/variant"
"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
"github.com/edgelesssys/constellation/v2/internal/encoding"
)
var (
_ svnResolveMarshaller = &AzureSEVSNP{}
_ svnResolveMarshaller = &AzureTDX{}
)
// DefaultForAzureSEVSNP returns the default configuration for Azure SEV-SNP attestation.
// Version numbers have placeholder values and the latest available values can be fetched using [AzureSEVSNP.FetchAndSetLatestVersionNumbers].
func DefaultForAzureSEVSNP() *AzureSEVSNP {
return &AzureSEVSNP{
Measurements: measurements.DefaultsFor(cloudprovider.Azure, variant.AzureSEVSNP{}),
BootloaderVersion: NewLatestPlaceholderVersion(),
TEEVersion: NewLatestPlaceholderVersion(),
SNPVersion: NewLatestPlaceholderVersion(),
MicrocodeVersion: NewLatestPlaceholderVersion(),
FirmwareSignerConfig: SNPFirmwareSignerConfig{
AcceptedKeyDigests: idkeydigest.DefaultList(),
EnforcementPolicy: idkeydigest.MAAFallback,
},
AMDRootKey: mustParsePEM(arkPEM),
}
}
// GetVariant returns azure-sev-snp as the variant.
func (AzureSEVSNP) GetVariant() variant.Variant {
return variant.AzureSEVSNP{}
}
// GetMeasurements returns the measurements used for attestation.
func (c AzureSEVSNP) GetMeasurements() measurements.M {
return c.Measurements
}
// SetMeasurements updates a config's measurements using the given measurements.
func (c *AzureSEVSNP) SetMeasurements(m measurements.M) {
c.Measurements = m
}
// EqualTo returns true if the config is equal to the given config.
func (c AzureSEVSNP) EqualTo(old AttestationCfg) (bool, error) {
otherCfg, ok := old.(*AzureSEVSNP)
if !ok {
return false, fmt.Errorf("cannot compare %T with %T", c, old)
}
firmwareSignerCfgEqual := c.FirmwareSignerConfig.EqualTo(otherCfg.FirmwareSignerConfig)
measurementsEqual := c.Measurements.EqualTo(otherCfg.Measurements)
bootloaderEqual := c.BootloaderVersion == otherCfg.BootloaderVersion
teeEqual := c.TEEVersion == otherCfg.TEEVersion
snpEqual := c.SNPVersion == otherCfg.SNPVersion
microcodeEqual := c.MicrocodeVersion == otherCfg.MicrocodeVersion
rootKeyEqual := bytes.Equal(c.AMDRootKey.Raw, otherCfg.AMDRootKey.Raw)
return firmwareSignerCfgEqual && measurementsEqual && bootloaderEqual && teeEqual && snpEqual && microcodeEqual && rootKeyEqual, nil
}
// FetchAndSetLatestVersionNumbers fetches the latest version numbers from the configapi and sets them.
func (c *AzureSEVSNP) FetchAndSetLatestVersionNumbers(ctx context.Context, fetcher attestationconfigapi.Fetcher) error {
// Only talk to the API if at least one version number is set to latest.
if !(c.BootloaderVersion.WantLatest || c.TEEVersion.WantLatest || c.SNPVersion.WantLatest || c.MicrocodeVersion.WantLatest) {
return nil
}
versions, err := fetcher.FetchSEVSNPVersionLatest(ctx, variant.AzureSEVSNP{})
if err != nil {
return fmt.Errorf("fetching latest TCB versions from configapi: %w", err)
}
// set number and keep isLatest flag
c.mergeWithLatestVersion(versions.SEVSNPVersion)
return nil
}
func (c *AzureSEVSNP) mergeWithLatestVersion(latest attestationconfigapi.SEVSNPVersion) {
if c.BootloaderVersion.WantLatest {
c.BootloaderVersion.Value = latest.Bootloader
}
if c.TEEVersion.WantLatest {
c.TEEVersion.Value = latest.TEE
}
if c.SNPVersion.WantLatest {
c.SNPVersion.Value = latest.SNP
}
if c.MicrocodeVersion.WantLatest {
c.MicrocodeVersion.Value = latest.Microcode
}
}
func (c *AzureSEVSNP) getToMarshallLatestWithResolvedVersions() AttestationCfg {
cp := *c
cp.BootloaderVersion.WantLatest = false
cp.TEEVersion.WantLatest = false
cp.SNPVersion.WantLatest = false
cp.MicrocodeVersion.WantLatest = false
return &cp
}
// GetVariant returns azure-trusted-launch as the variant.
func (AzureTrustedLaunch) GetVariant() variant.Variant {
return variant.AzureTrustedLaunch{}
}
// GetMeasurements returns the measurements used for attestation.
func (c AzureTrustedLaunch) GetMeasurements() measurements.M {
return c.Measurements
}
// SetMeasurements updates a config's measurements using the given measurements.
func (c *AzureTrustedLaunch) SetMeasurements(m measurements.M) {
c.Measurements = m
}
// EqualTo returns true if the config is equal to the given config.
func (c AzureTrustedLaunch) EqualTo(other AttestationCfg) (bool, error) {
otherCfg, ok := other.(*AzureTrustedLaunch)
if !ok {
return false, fmt.Errorf("cannot compare %T with %T", c, other)
}
return c.Measurements.EqualTo(otherCfg.Measurements), nil
}
// DefaultForAzureTDX returns the default configuration for Azure TDX attestation.
func DefaultForAzureTDX() *AzureTDX {
return &AzureTDX{
Measurements: measurements.DefaultsFor(cloudprovider.Azure, variant.AzureTDX{}),
// TODO(AB#3798): Enable latest versioning for Azure TDX
QESVN: 0,
PCESVN: 0,
TEETCBSVN: encoding.HexBytes{0x02, 0x01, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
QEVendorID: encoding.HexBytes{0x93, 0x9a, 0x72, 0x33, 0xf7, 0x9c, 0x4c, 0xa9, 0x94, 0x0a, 0x0d, 0xb3, 0x95, 0x7f, 0x06, 0x07},
MRSeam: encoding.HexBytes{0x36, 0x03, 0x04, 0xd3, 0x4a, 0x16, 0xaa, 0xce, 0x0a, 0x18, 0xe0, 0x9a, 0xd2, 0xd0, 0x7d, 0x2b, 0x9f, 0xd3, 0xc1, 0x74, 0x37, 0x8e, 0x5b, 0xf1, 0x08, 0x38, 0x80, 0x79, 0x82, 0x7f, 0x89, 0xff, 0x62, 0xac, 0xc5, 0xf8, 0xc4, 0x73, 0xdd, 0x40, 0x70, 0x63, 0x24, 0x83, 0x4e, 0x20, 0x29, 0x46},
XFAM: encoding.HexBytes{0xe7, 0x18, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00},
IntelRootKey: mustParsePEM(tdxRootPEM),
}
}
// GetVariant returns azure-tdx as the variant.
func (AzureTDX) GetVariant() variant.Variant {
return variant.AzureTDX{}
}
// GetMeasurements returns the measurements used for attestation.
func (c AzureTDX) GetMeasurements() measurements.M {
return c.Measurements
}
// SetMeasurements updates a config's measurements using the given measurements.
func (c *AzureTDX) SetMeasurements(m measurements.M) {
c.Measurements = m
}
// EqualTo returns true if the config is equal to the given config.
func (c AzureTDX) EqualTo(other AttestationCfg) (bool, error) {
otherCfg, ok := other.(*AzureTDX)
if !ok {
return false, fmt.Errorf("cannot compare %T with %T", c, other)
}
return c.Measurements.EqualTo(otherCfg.Measurements), nil
}
func (c *AzureTDX) getToMarshallLatestWithResolvedVersions() AttestationCfg {
cp := *c
// TODO: We probably want to support "latest" pseudo versioning for Azure TDX
// But we should decide on which claims can be reliably used for attestation first
return &cp
}