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encrypted.go
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encrypted.go
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package storage
import (
"context"
"crypto/cipher"
"time"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/anypb"
"google.golang.org/protobuf/types/known/wrapperspb"
"github.com/pomerium/pomerium/pkg/cryptutil"
"github.com/pomerium/pomerium/pkg/grpc/databroker"
)
type encryptedRecordStream struct {
underlying RecordStream
backend *encryptedBackend
err error
}
func (e *encryptedRecordStream) Close() error {
return e.underlying.Close()
}
func (e *encryptedRecordStream) Next(wait bool) bool {
return e.underlying.Next(wait)
}
func (e *encryptedRecordStream) Record() *databroker.Record {
r := e.underlying.Record()
if r != nil {
var err error
r, err = e.backend.decryptRecord(r)
if err != nil {
e.err = err
}
}
return r
}
func (e *encryptedRecordStream) Err() error {
if e.err == nil {
e.err = e.underlying.Err()
}
return e.err
}
type encryptedBackend struct {
underlying Backend
cipher cipher.AEAD
}
// NewEncryptedBackend creates a new encrypted backend.
func NewEncryptedBackend(secret []byte, underlying Backend) (Backend, error) {
c, err := cryptutil.NewAEADCipher(secret)
if err != nil {
return nil, err
}
return &encryptedBackend{
underlying: underlying,
cipher: c,
}, nil
}
func (e *encryptedBackend) Close() error {
return e.underlying.Close()
}
func (e *encryptedBackend) Get(ctx context.Context, recordType, id string) (*databroker.Record, error) {
record, err := e.underlying.Get(ctx, recordType, id)
if err != nil {
return nil, err
}
record, err = e.decryptRecord(record)
if err != nil {
return nil, err
}
return record, nil
}
func (e *encryptedBackend) GetAll(ctx context.Context) ([]*databroker.Record, *databroker.Versions, error) {
records, versions, err := e.underlying.GetAll(ctx)
if err != nil {
return nil, versions, err
}
for i := range records {
records[i], err = e.decryptRecord(records[i])
if err != nil {
return nil, versions, err
}
}
return records, versions, nil
}
func (e *encryptedBackend) GetOptions(ctx context.Context, recordType string) (*databroker.Options, error) {
return e.underlying.GetOptions(ctx, recordType)
}
func (e *encryptedBackend) Lease(ctx context.Context, leaseName, leaseID string, ttl time.Duration) (bool, error) {
return e.underlying.Lease(ctx, leaseName, leaseID, ttl)
}
func (e *encryptedBackend) Put(ctx context.Context, record *databroker.Record) (uint64, error) {
encrypted, err := e.encrypt(record.GetData())
if err != nil {
return 0, err
}
newRecord := proto.Clone(record).(*databroker.Record)
newRecord.Data = encrypted
serverVersion, err := e.underlying.Put(ctx, newRecord)
if err != nil {
return 0, err
}
record.ModifiedAt = newRecord.ModifiedAt
record.Version = newRecord.Version
return serverVersion, nil
}
func (e *encryptedBackend) SetOptions(ctx context.Context, recordType string, options *databroker.Options) error {
return e.underlying.SetOptions(ctx, recordType, options)
}
func (e *encryptedBackend) Sync(ctx context.Context, serverVersion, recordVersion uint64) (RecordStream, error) {
stream, err := e.underlying.Sync(ctx, serverVersion, recordVersion)
if err != nil {
return nil, err
}
return &encryptedRecordStream{
underlying: stream,
backend: e,
}, nil
}
func (e *encryptedBackend) decryptRecord(in *databroker.Record) (out *databroker.Record, err error) {
data, err := e.decrypt(in.Data)
if err != nil {
return nil, err
}
// Create a new record so that we don't re-use any internal state
return &databroker.Record{
Version: in.Version,
Type: data.TypeUrl,
Id: in.Id,
Data: data,
ModifiedAt: in.ModifiedAt,
DeletedAt: in.DeletedAt,
}, nil
}
func (e *encryptedBackend) decrypt(in *anypb.Any) (out *anypb.Any, err error) {
if in == nil {
return nil, nil
}
var encrypted wrapperspb.BytesValue
err = in.UnmarshalTo(&encrypted)
if err != nil {
return nil, err
}
plaintext, err := cryptutil.Decrypt(e.cipher, encrypted.Value, nil)
if err != nil {
return nil, err
}
out = new(anypb.Any)
err = proto.Unmarshal(plaintext, out)
if err != nil {
return nil, err
}
return out, nil
}
func (e *encryptedBackend) encrypt(in *anypb.Any) (out *anypb.Any, err error) {
plaintext, err := proto.Marshal(in)
if err != nil {
return nil, err
}
encrypted := cryptutil.Encrypt(e.cipher, plaintext, nil)
out, err = anypb.New(&wrapperspb.BytesValue{
Value: encrypted,
})
if err != nil {
return nil, err
}
return out, nil
}