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attestation.go
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attestation.go
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/*
Copyright (c) Edgeless Systems GmbH
SPDX-License-Identifier: AGPL-3.0-only
*/
package config
import (
"bytes"
"crypto/x509"
"encoding/json"
"encoding/pem"
"fmt"
"github.com/edgelesssys/constellation/v2/internal/attestation/measurements"
"github.com/edgelesssys/constellation/v2/internal/attestation/variant"
)
const (
// arkPEM is the PEM encoded AMD root key certificate. Received from the AMD Key Distribution System API (KDS).
arkPEM = `-----BEGIN CERTIFICATE-----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\nAFZEAwoKCQ==\n-----END CERTIFICATE-----\n`
// tdxRootPEM is the PEM encoded Intel TDX root key certificate. Receieved from the Intel Provisioning Certification Service (PCS).
tdxRootPEM = `-----BEGIN CERTIFICATE-----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\nAiEA4J0lrHoMs+Xo5o/sX6O9QWxHRAvZUGOdRQ7cvqRXaqI=\n-----END CERTIFICATE-----\n`
)
// AttestationCfg is the common interface for passing attestation configs.
type AttestationCfg interface {
// GetMeasurements returns the measurements that should be used for attestation.
GetMeasurements() measurements.M
// SetMeasurements updates a config's measurements using the given measurements.
SetMeasurements(m measurements.M)
// GetVariant returns the variant of the attestation config.
GetVariant() variant.Variant
// EqualTo returns true if the config is equal to the given config.
// If the variant differs, an error must be returned.
EqualTo(AttestationCfg) (bool, error)
}
// UnmarshalAttestationConfig unmarshals the config file into the correct type.
func UnmarshalAttestationConfig(data []byte, attestVariant variant.Variant) (AttestationCfg, error) {
switch attestVariant {
case variant.AWSNitroTPM{}:
return unmarshalTypedConfig[*AWSNitroTPM](data)
case variant.AWSSEVSNP{}:
return unmarshalTypedConfig[*AWSSEVSNP](data)
case variant.AzureSEVSNP{}:
return unmarshalTypedConfig[*AzureSEVSNP](data)
case variant.AzureTrustedLaunch{}:
return unmarshalTypedConfig[*AzureTrustedLaunch](data)
case variant.AzureTDX{}:
return unmarshalTypedConfig[*AzureTDX](data)
case variant.GCPSEVES{}:
return unmarshalTypedConfig[*GCPSEVES](data)
case variant.QEMUVTPM{}:
return unmarshalTypedConfig[*QEMUVTPM](data)
case variant.QEMUTDX{}:
return unmarshalTypedConfig[*QEMUTDX](data)
case variant.Dummy{}:
return unmarshalTypedConfig[*DummyCfg](data)
default:
return nil, fmt.Errorf("unknown variant: %s", attestVariant)
}
}
func unmarshalTypedConfig[T AttestationCfg](data []byte) (AttestationCfg, error) {
var cfg T
if err := json.Unmarshal(data, &cfg); err != nil {
return nil, err
}
return cfg, nil
}
// Certificate is a wrapper around x509.Certificate allowing custom marshaling.
type Certificate x509.Certificate
// Equal returns true if the embedded Raw values are equal.
func (c Certificate) Equal(other Certificate) bool {
return bytes.Equal(c.Raw, other.Raw)
}
// MarshalJSON marshals the certificate to PEM.
func (c Certificate) MarshalJSON() ([]byte, error) {
if len(c.Raw) == 0 {
return json.Marshal(new(string))
}
pem := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: c.Raw})
return json.Marshal(string(pem))
}
// MarshalYAML marshals the certificate to PEM.
func (c Certificate) MarshalYAML() (any, error) {
if len(c.Raw) == 0 {
return "", nil
}
pem := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: c.Raw})
return string(pem), nil
}
// UnmarshalJSON unmarshals the certificate from PEM.
func (c *Certificate) UnmarshalJSON(data []byte) error {
if len(data) == 0 {
return nil
}
return c.unmarshal(func(val any) error {
return json.Unmarshal(data, val)
})
}
// UnmarshalYAML unmarshals the certificate from PEM.
func (c *Certificate) UnmarshalYAML(unmarshal func(any) error) error {
return c.unmarshal(unmarshal)
}
func (c *Certificate) unmarshal(unmarshalFunc func(any) error) error {
var pemData string
if err := unmarshalFunc(&pemData); err != nil {
return err
}
if pemData == "" {
return nil
}
block, _ := pem.Decode([]byte(pemData))
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return err
}
*c = Certificate(*cert)
return nil
}
func mustParsePEM(data string) Certificate {
jsonData := fmt.Sprintf("\"%s\"", data)
var cert Certificate
if err := json.Unmarshal([]byte(jsonData), &cert); err != nil {
panic(err)
}
return cert
}
// DummyCfg is a placeholder for unknown attestation configs.
type DummyCfg struct {
// description: |
// The measurements that should be used for attestation.
Measurements measurements.M `json:"measurements,omitempty"`
}
// GetMeasurements returns the configs measurements.
func (c DummyCfg) GetMeasurements() measurements.M {
return c.Measurements
}
// GetVariant returns a dummy variant.
func (DummyCfg) GetVariant() variant.Variant {
return variant.Dummy{}
}
// SetMeasurements sets the configs measurements.
func (c *DummyCfg) SetMeasurements(m measurements.M) {
c.Measurements = m
}
// EqualTo returns true if measurements of the configs are equal.
func (c DummyCfg) EqualTo(other AttestationCfg) (bool, error) {
return c.Measurements.EqualTo(other.GetMeasurements()), nil
}