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|
package storage
import (
"crypto/x509"
"encoding/json"
"fmt"
"time"
)
// AK is the type used to store AKs.
type AK struct {
Name string
Data []byte
Chain []*x509.Certificate
CreatedAt time.Time
}
// MarshalJSON marshals the AK into JSON.
func (ak *AK) MarshalJSON() ([]byte, error) {
chain := make([][]byte, len(ak.Chain))
for i, cert := range ak.Chain {
chain[i] = cert.Raw
}
sak := serializedAK{
Name: ak.Name,
Type: typeAK,
Data: ak.Data,
CreatedAt: ak.CreatedAt,
}
if len(chain) > 0 {
sak.Chain = chain
}
return json.Marshal(sak)
}
// UnmarshalJSON unmarshals `data` into an AK.
func (ak *AK) UnmarshalJSON(data []byte) error {
sak := &serializedAK{}
if err := json.Unmarshal(data, sak); err != nil {
return fmt.Errorf("failed unmarshaling serialized AK: %w", err)
}
if sak.Type != typeAK {
return fmt.Errorf("unexpected serialized data type %q", sak.Type)
}
ak.Name = sak.Name
ak.Data = sak.Data
ak.CreatedAt = sak.CreatedAt
if len(sak.Chain) > 0 {
chain := make([]*x509.Certificate, len(sak.Chain))
for i, certBytes := range sak.Chain {
cert, err := x509.ParseCertificate(certBytes)
if err != nil {
return fmt.Errorf("failed parsing certificate: %w", err)
}
chain[i] = cert
}
ak.Chain = chain
}
return nil
}
// Key is the type used to store Keys.
type Key struct {
Name string
Data []byte
AttestedBy string
Chain []*x509.Certificate
CreatedAt time.Time
}
// MarshalJSON marshals the Key into JSON.
func (key *Key) MarshalJSON() ([]byte, error) {
chain := make([][]byte, len(key.Chain))
for i, cert := range key.Chain {
chain[i] = cert.Raw
}
sk := serializedKey{
Name: key.Name,
Type: typeKey,
Data: key.Data,
AttestedBy: key.AttestedBy,
CreatedAt: key.CreatedAt,
}
if len(chain) > 0 {
sk.Chain = chain
}
return json.Marshal(sk)
}
// UnmarshalJSON unmarshals `data` into a Key.
func (key *Key) UnmarshalJSON(data []byte) error {
sk := &serializedKey{}
if err := json.Unmarshal(data, sk); err != nil {
return fmt.Errorf("failed unmarshaling serialized key: %w", err)
}
if sk.Type != typeKey {
return fmt.Errorf("unexpected serialized data type %q", sk.Type)
}
key.Name = sk.Name
key.Data = sk.Data
key.AttestedBy = sk.AttestedBy
key.CreatedAt = sk.CreatedAt
if len(sk.Chain) > 0 {
chain := make([]*x509.Certificate, len(sk.Chain))
for i, certBytes := range sk.Chain {
cert, err := x509.ParseCertificate(certBytes)
if err != nil {
return fmt.Errorf("failed parsing certificate: %w", err)
}
chain[i] = cert
}
key.Chain = chain
}
return nil
}
const (
akPrefix = "ak-"
keyPrefix = "key-"
)
type tpmObjectType string
const (
typeAK tpmObjectType = "AK"
typeKey tpmObjectType = "KEY"
)
// serializedAK is the struct used when marshaling
// a storage AK to JSON.
type serializedAK struct {
Name string `json:"name"`
Type tpmObjectType `json:"type"`
Data []byte `json:"data"`
Chain [][]byte `json:"chain"`
CreatedAt time.Time `json:"createdAt"`
}
// serializedKey is the struct used when marshaling
// a storage Key to JSON.
type serializedKey struct {
Name string `json:"name"`
Type tpmObjectType `json:"type"`
Data []byte `json:"data"`
AttestedBy string `json:"attestedBy"`
Chain [][]byte `json:"chain"`
CreatedAt time.Time `json:"createdAt"`
}
// keyForAK returns the key to use when storing an AK.
func keyForAK(name string) string {
return fmt.Sprintf("%s%s", akPrefix, name)
}
// keyForKey returns the key to use when storing a Key.
func keyForKey(name string) string {
return fmt.Sprintf("%s%s", keyPrefix, name)
}
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