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htlcswitch: use distinct error for unreadable failures

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This commit is contained in:
Joost Jager 2019-06-19 11:12:10 +02:00
parent 0cdae56d28
commit 418fe364de
No known key found for this signature in database
GPG Key ID: A61B9D4C393C59C7
9 changed files with 396 additions and 165 deletions
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15
htlcswitch/mock.go
View File

@ -965,3 +965,18 @@ func (m *mockCircuitMap) NumPending() int {
func (m *mockCircuitMap) NumOpen() int {
return 0
}
type mockOnionErrorDecryptor struct {
sourceIdx int
message []byte
err error
}
func (m *mockOnionErrorDecryptor) DecryptError(encryptedData []byte) (
*sphinx.DecryptedError, error) {
return &sphinx.DecryptedError{
SenderIdx: m.sourceIdx,
Message: m.message,
}, m.err
}

35
htlcswitch/switch.go
View File

@ -58,6 +58,10 @@ var (
// active links in the switch for a specific destination.
ErrNoLinksFound = errors.New("no channel links found")
// ErrUnreadableFailureMessage is returned when the failure message
// cannot be decrypted.
ErrUnreadableFailureMessage = errors.New("unreadable failure message")
// zeroPreimage is the empty preimage which is returned when we have
// some errors.
zeroPreimage [sha256.Size]byte
@ -936,9 +940,7 @@ func (s *Switch) extractResult(deobfuscator ErrorDecrypter, n *networkResult,
// the payment deobfuscator.
func (s *Switch) parseFailedPayment(deobfuscator ErrorDecrypter,
paymentID uint64, paymentHash lntypes.Hash, unencrypted,
isResolution bool, htlc *lnwire.UpdateFailHTLC) *ForwardingError {
var failure *ForwardingError
isResolution bool, htlc *lnwire.UpdateFailHTLC) error {
switch {
@ -960,7 +962,8 @@ func (s *Switch) parseFailedPayment(deobfuscator ErrorDecrypter,
// router.
failureMsg = lnwire.NewTemporaryChannelFailure(nil)
}
failure = &ForwardingError{
return &ForwardingError{
FailureSourceIdx: 0,
ExtraMsg: userErr,
FailureMessage: failureMsg,
@ -974,7 +977,8 @@ func (s *Switch) parseFailedPayment(deobfuscator ErrorDecrypter,
userErr := fmt.Sprintf("payment was resolved "+
"on-chain, then cancelled back (hash=%v, pid=%d)",
paymentHash, paymentID)
failure = &ForwardingError{
return &ForwardingError{
FailureSourceIdx: 0,
ExtraMsg: userErr,
FailureMessage: lnwire.FailPermanentChannelFailure{},
@ -983,24 +987,19 @@ func (s *Switch) parseFailedPayment(deobfuscator ErrorDecrypter,
// A regular multi-hop payment error that we'll need to
// decrypt.
default:
var err error
// We'll attempt to fully decrypt the onion encrypted
// error. If we're unable to then we'll bail early.
failure, err = deobfuscator.DecryptError(htlc.Reason)
failure, err := deobfuscator.DecryptError(htlc.Reason)
if err != nil {
userErr := fmt.Sprintf("unable to de-obfuscate "+
"onion failure (hash=%v, pid=%d): %v",
log.Errorf("unable to de-obfuscate onion failure "+
"(hash=%v, pid=%d): %v",
paymentHash, paymentID, err)
log.Error(userErr)
failure = &ForwardingError{
FailureSourceIdx: 0,
ExtraMsg: userErr,
FailureMessage: lnwire.NewTemporaryChannelFailure(nil),
}
}
}
return failure
return ErrUnreadableFailureMessage
}
return failure
}
}
// handlePacketForward is used in cases when we need forward the htlc update

104
htlcswitch/switch_test.go
View File

@ -2241,3 +2241,107 @@ func TestSwitchGetPaymentResult(t *testing.T) {
t.Fatalf("result not received")
}
}
// TestInvalidFailure tests that the switch returns an unreadable failure error
// if the failure cannot be decrypted.
func TestInvalidFailure(t *testing.T) {
t.Parallel()
alicePeer, err := newMockServer(t, "alice", testStartingHeight, nil, 6)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
s, err := initSwitchWithDB(testStartingHeight, nil)
if err != nil {
t.Fatalf("unable to init switch: %v", err)
}
if err := s.Start(); err != nil {
t.Fatalf("unable to start switch: %v", err)
}
defer s.Stop()
chanID1, _, aliceChanID, _ := genIDs()
// Set up a mock channel link.
aliceChannelLink := newMockChannelLink(
s, chanID1, aliceChanID, alicePeer, true,
)
if err := s.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add link: %v", err)
}
// Create a request which should be forwarded to the mock channel link.
preimage, err := genPreimage()
if err != nil {
t.Fatalf("unable to generate preimage: %v", err)
}
rhash := fastsha256.Sum256(preimage[:])
update := &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
}
paymentID := uint64(123)
// Send the request.
err = s.SendHTLC(
aliceChannelLink.ShortChanID(), paymentID, update,
)
if err != nil {
t.Fatalf("unable to send payment: %v", err)
}
// Catch the packet and complete the circuit so that the switch is ready
// for a response.
select {
case packet := <-aliceChannelLink.packets:
if err := aliceChannelLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete payment circuit: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
// Send response packet with an unreadable failure message to the
// switch. The reason failed is not relevant, because we mock the
// decryption.
packet := &htlcPacket{
outgoingChanID: aliceChannelLink.ShortChanID(),
outgoingHTLCID: 0,
amount: 1,
htlc: &lnwire.UpdateFailHTLC{
Reason: []byte{1, 2, 3},
},
}
if err := s.forward(packet); err != nil {
t.Fatalf("can't forward htlc packet: %v", err)
}
// Get payment result from switch. We expect an unreadable failure
// message error.
deobfuscator := SphinxErrorDecrypter{
OnionErrorDecrypter: &mockOnionErrorDecryptor{
err: ErrUnreadableFailureMessage,
},
}
resultChan, err := s.GetPaymentResult(
paymentID, rhash, &deobfuscator,
)
if err != nil {
t.Fatal(err)
}
select {
case result := <-resultChan:
if result.Error != ErrUnreadableFailureMessage {
t.Fatal("expected unreadable failure message")
}
case <-time.After(time.Second):
t.Fatal("err wasn't received")
}
}

258
lnrpc/routerrpc/router.pb.go
View File

@ -103,31 +103,36 @@ const (
Failure_TEMPORARY_NODE_FAILURE Failure_FailureCode = 19
Failure_PERMANENT_NODE_FAILURE Failure_FailureCode = 20
Failure_PERMANENT_CHANNEL_FAILURE Failure_FailureCode = 21
//*
//An unreadable failure result is returned if the received failure message
//cannot be decrypted. In that case the error source is unknown.
Failure_UNREADABLE_FAILURE Failure_FailureCode = 999
)
var Failure_FailureCode_name = map[int32]string{
0: "RESERVED",
1: "UNKNOWN_PAYMENT_HASH",
2: "INCORRECT_PAYMENT_AMOUNT",
3: "FINAL_INCORRECT_CLTV_EXPIRY",
4: "FINAL_INCORRECT_HTLC_AMOUNT",
5: "FINAL_EXPIRY_TOO_SOON",
6: "INVALID_REALM",
7: "EXPIRY_TOO_SOON",
8: "INVALID_ONION_VERSION",
9: "INVALID_ONION_HMAC",
10: "INVALID_ONION_KEY",
11: "AMOUNT_BELOW_MINIMUM",
12: "FEE_INSUFFICIENT",
13: "INCORRECT_CLTV_EXPIRY",
14: "CHANNEL_DISABLED",
15: "TEMPORARY_CHANNEL_FAILURE",
16: "REQUIRED_NODE_FEATURE_MISSING",
17: "REQUIRED_CHANNEL_FEATURE_MISSING",
18: "UNKNOWN_NEXT_PEER",
19: "TEMPORARY_NODE_FAILURE",
20: "PERMANENT_NODE_FAILURE",
21: "PERMANENT_CHANNEL_FAILURE",
0: "RESERVED",
1: "UNKNOWN_PAYMENT_HASH",
2: "INCORRECT_PAYMENT_AMOUNT",
3: "FINAL_INCORRECT_CLTV_EXPIRY",
4: "FINAL_INCORRECT_HTLC_AMOUNT",
5: "FINAL_EXPIRY_TOO_SOON",
6: "INVALID_REALM",
7: "EXPIRY_TOO_SOON",
8: "INVALID_ONION_VERSION",
9: "INVALID_ONION_HMAC",
10: "INVALID_ONION_KEY",
11: "AMOUNT_BELOW_MINIMUM",
12: "FEE_INSUFFICIENT",
13: "INCORRECT_CLTV_EXPIRY",
14: "CHANNEL_DISABLED",
15: "TEMPORARY_CHANNEL_FAILURE",
16: "REQUIRED_NODE_FEATURE_MISSING",
17: "REQUIRED_CHANNEL_FEATURE_MISSING",
18: "UNKNOWN_NEXT_PEER",
19: "TEMPORARY_NODE_FAILURE",
20: "PERMANENT_NODE_FAILURE",
21: "PERMANENT_CHANNEL_FAILURE",
999: "UNREADABLE_FAILURE",
}
var Failure_FailureCode_value = map[string]int32{
@ -153,6 +158,7 @@ var Failure_FailureCode_value = map[string]int32{
"TEMPORARY_NODE_FAILURE": 19,
"PERMANENT_NODE_FAILURE": 20,
"PERMANENT_CHANNEL_FAILURE": 21,
"UNREADABLE_FAILURE": 999,
}
func (x Failure_FailureCode) String() string {
@ -1167,110 +1173,110 @@ func init() {
func init() { proto.RegisterFile("routerrpc/router.proto", fileDescriptor_7a0613f69d37b0a5) }
var fileDescriptor_7a0613f69d37b0a5 = []byte{
// 1635 bytes of a gzipped FileDescriptorProto
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0x73, 0x55, 0x1c, 0x19, 0x92, 0x40, 0x3e, 0x3a, 0x96, 0x1a, 0x1c, 0x4d, 0x3d, 0x9f, 0xce, 0xb8,
0xcf, 0x26, 0xde, 0x5f, 0x38, 0x5d, 0x6c, 0x19, 0x69, 0xc5, 0xde, 0x2a, 0x43, 0x26, 0x14, 0xd7,
0x82, 0xce, 0xa8, 0xa0, 0xd7, 0xb0, 0x97, 0x7f, 0x4f, 0x41, 0x31, 0xb9, 0x2f, 0xa1, 0x12, 0xe4,
0x2d, 0x9b, 0xb6, 0x3a, 0xd6, 0xb7, 0xed, 0xbe, 0xf1, 0x89, 0xfc, 0xec, 0x0d, 0x1a, 0x0d, 0x8c,
0x9b, 0xb8, 0x69, 0xa4, 0x10, 0x82, 0xb2, 0x1c, 0x08, 0xb8, 0x49, 0xfb, 0x56, 0x17, 0x3b, 0x03,
0xf9, 0x6a, 0x1c, 0xc2, 0x7e, 0x8c, 0xd9, 0x0e, 0x25, 0xce, 0xa0, 0x8f, 0x8d, 0x34, 0x32, 0xa0,
0x18, 0x83, 0x98, 0x10, 0x87, 0x18, 0x19, 0x39, 0xea, 0x62, 0xe4, 0xe1, 0x0b, 0xd4, 0xc4, 0xfd,
0xba, 0xd5, 0xe9, 0x19, 0xd9, 0xda, 0xdf, 0x32, 0xb0, 0xab, 0xf6, 0x8b, 0x10, 0xb5, 0xa1, 0x90,
0x58, 0xd4, 0xd1, 0x59, 0xa2, 0x02, 0x0f, 0x17, 0xf8, 0x6a, 0x65, 0xfb, 0x02, 0x38, 0x8f, 0xbe,
0x4a, 0xa1, 0xef, 0xa0, 0x98, 0x5c, 0x3b, 0x51, 0x72, 0x9d, 0xd8, 0xb2, 0x8f, 0x7e, 0x50, 0xd7,
0x1b, 0x30, 0x70, 0x24, 0xbc, 0xa9, 0x5c, 0x1f, 0xe2, 0x85, 0x0e, 0x55, 0x13, 0xfc, 0x8d, 0x2d,
0xb1, 0x7a, 0xba, 0x55, 0x16, 0xf7, 0x47, 0x47, 0x87, 0x18, 0xaf, 0x54, 0x0f, 0x42, 0x5c, 0xdf,
0xe3, 0xaa, 0xcf, 0x1f, 0x13, 0xc7, 0xda, 0x5c, 0x38, 0xdc, 0xd2, 0xc9, 0xe8, 0xd7, 0x49, 0x0f,
0x1e, 0x9d, 0x03, 0xd5, 0x17, 0xbf, 0x44, 0x5b, 0x59, 0xd9, 0xd2, 0xf2, 0x6b, 0x56, 0x1e, 0x1f,
0x18, 0x6b, 0x56, 0x3e, 0x30, 0x39, 0x5e, 0xff, 0xf6, 0x8f, 0x57, 0x23, 0x4f, 0x8c, 0xe7, 0x37,
0x97, 0xc3, 0x60, 0x7a, 0x35, 0xf1, 0x46, 0x63, 0xe1, 0x7b, 0xfe, 0xc8, 0xe7, 0xe2, 0xcf, 0x41,
0x78, 0x77, 0x35, 0xf1, 0xdd, 0x2b, 0xb5, 0xa2, 0x5e, 0x2d, 0xd5, 0xdd, 0xec, 0xaa, 0x7f, 0xf0,
0x7e, 0xf7, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0x7c, 0x28, 0x1a, 0x3a, 0x10, 0x0e, 0x00, 0x00,
}
// Reference imports to suppress errors if they are not otherwise used.

6
lnrpc/routerrpc/router.proto
View File

@ -194,6 +194,12 @@ message Failure {
TEMPORARY_NODE_FAILURE = 19;
PERMANENT_NODE_FAILURE = 20;
PERMANENT_CHANNEL_FAILURE = 21;
/**
An unreadable failure result is returned if the received failure message
cannot be decrypted. In that case the error source is unknown.
*/
UNREADABLE_FAILURE = 999;
}
/// Failure code as defined in the Lightning spec

5
lnrpc/routerrpc/router_server.go
View File

@ -310,6 +310,11 @@ func (s *Server) SendToRoute(ctx context.Context,
func marshallError(sendError error) (*Failure, error) {
response := &Failure{}
if sendError == htlcswitch.ErrUnreadableFailureMessage {
response.Code = Failure_UNREADABLE_FAILURE
return response, nil
}
fErr, ok := sendError.(*htlcswitch.ForwardingError)
if !ok {
return nil, sendError

29
routing/payment_lifecycle.go
View File

@ -17,7 +17,7 @@ import (
type errNoRoute struct {
// lastError is the error encountered during the last payment attempt,
// if at least one attempt has been made.
lastError *htlcswitch.ForwardingError
lastError error
}
// Error returns a string representation of the error.
@ -37,7 +37,7 @@ type paymentLifecycle struct {
finalCLTVDelta uint16
attempt *channeldb.PaymentAttemptInfo
circuit *sphinx.Circuit
lastError *htlcswitch.ForwardingError
lastError error
}
// resumePayment resumes the paymentLifecycle from the current state.
@ -341,25 +341,16 @@ func (p *paymentLifecycle) sendPaymentAttempt(firstHop lnwire.ShortChannelID,
// handleSendError inspects the given error from the Switch and determines
// whether we should make another payment attempt.
func (p *paymentLifecycle) handleSendError(sendErr error) error {
var reason channeldb.FailureReason
// If an internal, non-forwarding error occurred, we can stop trying.
fErr, ok := sendErr.(*htlcswitch.ForwardingError)
if !ok {
reason = channeldb.FailureReasonError
} else {
var final bool
final, reason = p.router.processSendError(
p.paySession, &p.attempt.Route, fErr,
)
final, reason := p.router.processSendError(
p.paySession, &p.attempt.Route, sendErr,
)
if !final {
// Save the forwarding error so it can be returned if
// this turns out to be the last attempt.
p.lastError = sendErr
if !final {
// Save the forwarding error so it can be returned if
// this turns out to be the last attempt.
p.lastError = fErr
return nil
}
return nil
}
log.Debugf("Payment %x failed: final_outcome=%v, raw_err=%v",

20
routing/router.go
View File

@ -1812,8 +1812,24 @@ func (r *ChannelRouter) sendPayment(
// to continue with an alternative route. This is indicated by the boolean
// return value.
func (r *ChannelRouter) processSendError(paySession PaymentSession,
rt *route.Route, fErr *htlcswitch.ForwardingError) (
bool, channeldb.FailureReason) {
rt *route.Route, sendErr error) (bool, channeldb.FailureReason) {
// If the failure message could not be decrypted, attribute the failure
// to our own outgoing channel.
//
// TODO(joostager): Penalize all channels in the route.
if sendErr == htlcswitch.ErrUnreadableFailureMessage {
sendErr = &htlcswitch.ForwardingError{
FailureSourceIdx: 0,
FailureMessage: lnwire.NewTemporaryChannelFailure(nil),
}
}
// If an internal, non-forwarding error occurred, we can stop trying.
fErr, ok := sendErr.(*htlcswitch.ForwardingError)
if !ok {
return true, channeldb.FailureReasonError
}
var (
failureSourceIdx = fErr.FailureSourceIdx

89
routing/router_test.go
View File

@ -2425,6 +2425,95 @@ func TestEmptyRoutesGenerateSphinxPacket(t *testing.T) {
}
}
// TestUnknownErrorSource tests that if the source of an error is unknown, all
// edges along the route will be pruned.
func TestUnknownErrorSource(t *testing.T) {
t.Parallel()
// Setup a network. It contains two paths to c: a->b->c and an
// alternative a->d->c.
chanCapSat := btcutil.Amount(100000)
testChannels := []*testChannel{
symmetricTestChannel("a", "b", chanCapSat, &testChannelPolicy{
Expiry: 144,
FeeRate: 400,
MinHTLC: 1,
MaxHTLC: lnwire.NewMSatFromSatoshis(chanCapSat),
}, 1),
symmetricTestChannel("b", "c", chanCapSat, &testChannelPolicy{
Expiry: 144,
FeeRate: 400,
MinHTLC: 1,
MaxHTLC: lnwire.NewMSatFromSatoshis(chanCapSat),
}, 3),
symmetricTestChannel("a", "d", chanCapSat, &testChannelPolicy{
Expiry: 144,
FeeRate: 400,
FeeBaseMsat: 100000,
MinHTLC: 1,
MaxHTLC: lnwire.NewMSatFromSatoshis(chanCapSat),
}, 2),
symmetricTestChannel("d", "c", chanCapSat, &testChannelPolicy{
Expiry: 144,
FeeRate: 400,
FeeBaseMsat: 100000,
MinHTLC: 1,
MaxHTLC: lnwire.NewMSatFromSatoshis(chanCapSat),
}, 4),
}
testGraph, err := createTestGraphFromChannels(testChannels, "a")
defer testGraph.cleanUp()
if err != nil {
t.Fatalf("unable to create graph: %v", err)
}
const startingBlockHeight = 101
ctx, cleanUp, err := createTestCtxFromGraphInstance(startingBlockHeight,
testGraph)
defer cleanUp()
if err != nil {
t.Fatalf("unable to create router: %v", err)
}
// Create a payment to node c.
payment := LightningPayment{
Target: ctx.aliases["c"],
Amount: lnwire.NewMSatFromSatoshis(1000),
FeeLimit: noFeeLimit,
PaymentHash: lntypes.Hash{},
}
// We'll modify the SendToSwitch method so that it simulates hop b as a
// node that returns an unparsable failure if approached via the a->b
// channel.
ctx.router.cfg.Payer.(*mockPaymentAttemptDispatcher).setPaymentResult(
func(firstHop lnwire.ShortChannelID) ([32]byte, error) {
// If channel a->b is used, return an error without
// source and message. The sender won't know the origin
// of the error.
if firstHop.ToUint64() == 1 {
return [32]byte{},
htlcswitch.ErrUnreadableFailureMessage
}
// Otherwise the payment succeeds.
return lntypes.Preimage{}, nil
})
// Send off the payment request to the router. The expectation is that
// the route a->b->c is tried first. An unreadable faiure is returned
// which should pruning the channel a->b. We expect the payment to
// succeed via a->d.
_, _, err = ctx.router.SendPayment(&payment)
if err != nil {
t.Fatalf("expected payment to succeed, but got: %v", err)
}
}
// assertChannelsPruned ensures that only the given channels are pruned from the
// graph out of the set of all channels.
func assertChannelsPruned(t *testing.T, graph *channeldb.ChannelGraph,