forked from keys-pub/keys-ext
/
encrypt.go
309 lines (271 loc) · 6.32 KB
/
encrypt.go
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package service
import (
"bufio"
"bytes"
"context"
"io"
"os"
"github.com/burlingtonbertie99/mykeys"
"github.com/burlingtonbertie99/mykeys/saltpack"
"github.com/pkg/errors"
)
type encrypt struct {
recipients []keys.ID
sender keys.ID
mode EncryptMode
armored bool
}
func (s *service) newEncrypt(ctx context.Context, recipients []string, sender string, options *EncryptOptions) (*encrypt, error) {
if options == nil {
options = &EncryptOptions{}
}
var skid keys.ID
if sender != "" {
s, err := s.lookup(ctx, sender, &lookupOpts{VerifyUser: true})
if err != nil {
return nil, err
}
skid = s
}
recs, err := s.lookupAll(ctx, recipients, &lookupOpts{VerifyUser: true})
if err != nil {
return nil, err
}
// Add sender as a recipient (unless options.NoSenderRecipient).
recsSet := keys.NewIDSet(recs...)
if !options.NoSenderRecipient && skid != "" {
recsSet.Add(skid)
}
if recsSet.Size() == 0 {
return nil, errors.Errorf("no recipients specified")
}
if skid != "" && options.NoSign && options.NoSenderRecipient {
return nil, errors.Errorf("sender specified without signing or adding as a recipient")
}
if options.NoSign {
skid = ""
}
// For default mode, if signing, use signcrypt, otherwise use encrypt.
mode := options.Mode
if mode == DefaultEncrypt {
if skid != "" {
mode = SaltpackSigncrypt
} else {
mode = SaltpackEncrypt
}
}
return &encrypt{
recipients: recsSet.IDs(),
sender: skid,
mode: mode,
armored: options.Armored,
}, nil
}
// Encrypt (RPC) data.
func (s *service) Encrypt(ctx context.Context, req *EncryptRequest) (*EncryptResponse, error) {
enc, err := s.newEncrypt(ctx, req.Recipients, req.Sender, req.Options)
if err != nil {
return nil, err
}
var out []byte
switch enc.mode {
case SaltpackEncrypt:
sbk, err := s.x25519Key(enc.sender)
if err != nil {
return nil, err
}
out, err = saltpack.Encrypt(req.Data, enc.armored, sbk, enc.recipients...)
if err != nil {
return nil, err
}
case SaltpackSigncrypt:
sk, err := s.edx25519Key(enc.sender)
if err != nil {
return nil, err
}
out, err = saltpack.Signcrypt(req.Data, enc.armored, sk, enc.recipients...)
if err != nil {
return nil, err
}
default:
return nil, errors.Errorf("unsupported mode %s", enc.mode)
}
return &EncryptResponse{
Data: out,
}, nil
}
func (s *service) encryptWriteInOut(ctx context.Context, in string, out string, enc *encrypt) error {
outTmp := out + ".tmp"
outFile, err := os.Create(outTmp)
if err != nil {
return err
}
defer func() {
_ = outFile.Close()
_ = os.Remove(outTmp)
}()
writer := bufio.NewWriter(outFile)
stream, err := s.encryptWriter(ctx, writer, enc)
if err != nil {
return err
}
inFile, err := os.Open(in) // #nosec
if err != nil {
return err
}
defer func() {
_ = inFile.Close()
}()
reader := bufio.NewReader(inFile)
if _, err := reader.WriteTo(stream); err != nil {
return err
}
if err := stream.Close(); err != nil {
return err
}
if err := writer.Flush(); err != nil {
return err
}
if err := inFile.Close(); err != nil {
return err
}
if err := outFile.Close(); err != nil {
return err
}
if err := os.Rename(outTmp, out); err != nil {
return err
}
return nil
}
func (s *service) encryptWriter(ctx context.Context, w io.Writer, enc *encrypt) (io.WriteCloser, error) {
var stream io.WriteCloser
switch enc.mode {
case SaltpackEncrypt:
sbk, err := s.x25519Key(enc.sender)
if err != nil {
return nil, err
}
logger.Infof("Encrypt stream for %s from %s", enc.recipients, enc.sender)
stream, err = saltpack.NewEncryptStream(w, enc.armored, sbk, enc.recipients...)
if err != nil {
return nil, err
}
case SaltpackSigncrypt:
if enc.sender == "" {
return nil, errors.Errorf("no sender specified")
}
sk, err := s.edx25519Key(enc.sender)
if err != nil {
return nil, err
}
if sk == nil {
return nil, keys.NewErrNotFound(enc.sender.String())
}
logger.Infof("Signcrypt stream for %s from %s", enc.recipients, enc.sender)
stream, err = saltpack.NewSigncryptStream(w, enc.armored, sk, enc.recipients...)
if err != nil {
return nil, err
}
default:
return nil, errors.Errorf("unsupported mode %s", enc.mode)
}
return stream, nil
}
// EncryptFile (RPC) ...
func (s *service) EncryptFile(srv RPC_EncryptFileServer) error {
req, err := srv.Recv()
if err != nil {
return err
}
in := req.In
if in == "" {
return errors.Errorf("in not specified")
}
out := req.Out
if out == "" {
out = in + ".enc"
}
enc, err := s.newEncrypt(srv.Context(), req.Recipients, req.Sender, req.Options)
if err != nil {
return err
}
if err := s.encryptWriteInOut(srv.Context(), in, out, enc); err != nil {
return err
}
if err := srv.Send(&EncryptFileOutput{
Out: out,
}); err != nil {
return err
}
return nil
}
// EncryptStream (RPC) ...
func (s *service) EncryptStream(srv RPC_EncryptStreamServer) error {
init := false
var stream io.WriteCloser
var buf bytes.Buffer
ctx := srv.Context()
for {
select {
case <-ctx.Done():
return ctx.Err()
default:
}
req, recvErr := srv.Recv()
if recvErr == io.EOF {
break
}
if recvErr != nil {
return recvErr
}
if !init {
init = true
if stream != nil {
return errors.Errorf("stream already initialized")
}
enc, err := s.newEncrypt(ctx, req.Recipients, req.Sender, req.Options)
if err != nil {
return err
}
s, err := s.encryptWriter(ctx, &buf, enc)
if err != nil {
return err
}
stream = s
} else {
// Make sure request only sends data after init
if len(req.Recipients) != 0 || req.Sender != "" || req.Options != nil {
return errors.Errorf("after stream is initalized, only data should be sent")
}
}
if len(req.Data) > 0 {
n, writeErr := stream.Write(req.Data)
if writeErr != nil {
return writeErr
}
if n != len(req.Data) {
return errors.Errorf("failed to write completely (%d != %d)", n, len(req.Data))
}
if buf.Len() > 0 {
out := buf.Bytes()
if err := srv.Send(&EncryptOutput{Data: out}); err != nil {
return err
}
buf.Reset()
}
}
}
logger.Debugf("Stream close")
// Close stream and flush buffer
if err := stream.Close(); err != nil {
return err
}
if buf.Len() > 0 {
out := buf.Bytes()
if err := srv.Send(&EncryptOutput{Data: out}); err != nil {
return err
}
buf.Reset()
}
return nil
}