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htlcswitch: auto-fail held htlcs

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Make the interceptable switch aware of htlc expiry and fail back htlcs in-time
to prevent the counterparty from force-closing the channel.
This commit is contained in:
Joost Jager 2022-08-15 17:28:19 +02:00
parent 74eeb95e8c
commit a0a50fa844
No known key found for this signature in database
GPG Key ID: B9A26449A5528325
13 changed files with 429 additions and 212 deletions
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10
docs/release-notes/release-notes-0.16.0.md
View File

@ -28,7 +28,14 @@
Similar to TrackPaymentV2, but for any inflight payment.
* [Catch and throw an error](https://github.com/lightningnetwork/lnd/pull/6945)
during `openchannel` if the local funding amount given is zero.
during `openchannel` if the local funding amount given is zero.
* [Extend](https://github.com/lightningnetwork/lnd/pull/6831) the HTLC
interceptor server implementation with watchdog functionality to cancel back
HTLCs for which an interceptor client does not provide a resolution in time.
If an HTLC expires, the counterparty will claim it back on-chain and the
receiver will lose it. Therefore the receiver can just as well fail off-chain
a few blocks before so that the channel is saved.
* [Make remote channel reserve amount configurable for
`openchannel`](https://github.com/lightningnetwork/lnd/pull/6956)
@ -167,6 +174,7 @@ details.
* Graham Krizek
* hieblmi
* Jesse de Wit
* Joost Jager
* Jordi Montes
* Matt Morehouse
* Michael Street

14
htlcswitch/held_htlc_set.go
View File

@ -37,6 +37,20 @@ func (h *heldHtlcSet) popAll(cb func(InterceptedForward)) {
h.set = make(map[channeldb.CircuitKey]InterceptedForward)
}
// popAutoFails calls the callback for each forward that has an auto-fail height
// equal or less then the specified pop height and removes them from the set.
func (h *heldHtlcSet) popAutoFails(height uint32, cb func(InterceptedForward)) {
for key, fwd := range h.set {
if uint32(fwd.Packet().AutoFailHeight) > height {
continue
}
cb(fwd)
delete(h.set, key)
}
}
// pop returns the specified forward and removes it from the set.
func (h *heldHtlcSet) pop(key channeldb.CircuitKey) (InterceptedForward, error) {
intercepted, ok := h.set[key]

46
htlcswitch/held_htlc_set_test.go
View File

@ -78,3 +78,49 @@ func TestHeldHtlcSet(t *testing.T) {
_, err = set.pop(key)
require.Error(t, err)
}
func TestHeldHtlcSetAutoFails(t *testing.T) {
set := newHeldHtlcSet()
key := channeldb.CircuitKey{
ChanID: lnwire.NewShortChanIDFromInt(1),
HtlcID: 2,
}
const autoFailHeight = 100
fwd := &interceptedForward{
packet: &htlcPacket{},
htlc: &lnwire.UpdateAddHTLC{},
autoFailHeight: autoFailHeight,
}
require.NoError(t, set.push(key, fwd))
// Test popping auto fails up to one block before the auto-fail height
// of our forward.
set.popAutoFails(
autoFailHeight-1,
func(_ InterceptedForward) {
require.Fail(t, "unexpected fwd")
},
)
// Popping succeeds at the auto-fail height.
cbCalled := false
set.popAutoFails(
autoFailHeight,
func(poppedFwd InterceptedForward) {
cbCalled = true
require.Equal(t, fwd, poppedFwd)
},
)
require.True(t, cbCalled)
// After this, there should be nothing more to pop.
set.popAutoFails(
autoFailHeight,
func(_ InterceptedForward) {
require.Fail(t, "unexpected fwd")
},
)
}

55
htlcswitch/interceptable_switch.go
View File

@ -64,6 +64,13 @@ type InterceptableSwitch struct {
// htlc where we no longer intercept it and instead cancel it back.
cltvRejectDelta uint32
// cltvInterceptDelta defines the number of blocks before the expiry of
// the htlc where we don't intercept anymore. This value must be greater
// than CltvRejectDelta, because we don't want to offer htlcs to the
// interceptor client for which there is no time left to resolve them
// anymore.
cltvInterceptDelta uint32
// notifier is an instance of a chain notifier that we'll use to signal
// the switch when a new block has arrived.
notifier chainntnfs.ChainNotifier
@ -137,9 +144,17 @@ type InterceptableSwitchConfig struct {
Notifier chainntnfs.ChainNotifier
// CltvRejectDelta defines the number of blocks before the expiry of the
// htlc where we no longer intercept it and instead cancel it back.
// htlc where we auto-fail an intercepted htlc to prevent channel
// force-closure.
CltvRejectDelta uint32
// CltvInterceptDelta defines the number of blocks before the expiry of
// the htlc where we don't intercept anymore. This value must be greater
// than CltvRejectDelta, because we don't want to offer htlcs to the
// interceptor client for which there is no time left to resolve them
// anymore.
CltvInterceptDelta uint32
// RequireInterceptor indicates whether processing should block if no
// interceptor is connected.
RequireInterceptor bool
@ -149,6 +164,12 @@ type InterceptableSwitchConfig struct {
func NewInterceptableSwitch(cfg *InterceptableSwitchConfig) (
*InterceptableSwitch, error) {
if cfg.CltvInterceptDelta <= cfg.CltvRejectDelta {
return nil, fmt.Errorf("cltv intercept delta %v not greater "+
"than cltv reject delta %v",
cfg.CltvInterceptDelta, cfg.CltvRejectDelta)
}
return &InterceptableSwitch{
htlcSwitch: cfg.Switch,
intercepted: make(chan *interceptedPackets),
@ -158,6 +179,7 @@ func NewInterceptableSwitch(cfg *InterceptableSwitchConfig) (
resolutionChan: make(chan *fwdResolution),
requireInterceptor: cfg.RequireInterceptor,
cltvRejectDelta: cfg.CltvRejectDelta,
cltvInterceptDelta: cfg.CltvInterceptDelta,
notifier: cfg.Notifier,
quit: make(chan struct{}),
@ -275,11 +297,30 @@ func (s *InterceptableSwitch) run() error {
s.currentHeight = currentBlock.Height
// A new block is appended. Fail any held htlcs that
// expire at this height to prevent channel force-close.
s.failExpiredHtlcs()
case <-s.quit:
return nil
}
}
}
func (s *InterceptableSwitch) failExpiredHtlcs() {
s.heldHtlcSet.popAutoFails(
uint32(s.currentHeight),
func(fwd InterceptedForward) {
err := fwd.FailWithCode(
lnwire.CodeTemporaryChannelFailure,
)
if err != nil {
log.Errorf("Cannot fail packet: %v", err)
}
},
)
}
func (s *InterceptableSwitch) sendForward(fwd InterceptedForward) {
err := s.interceptor(fwd.Packet())
if err != nil {
@ -426,6 +467,8 @@ func (s *InterceptableSwitch) interceptForward(packet *htlcPacket,
htlc: htlc,
packet: packet,
htlcSwitch: s.htlcSwitch,
autoFailHeight: int32(packet.incomingTimeout -
s.cltvRejectDelta),
}
// Handle forwards that are too close to expiry.
@ -516,7 +559,7 @@ func (s *InterceptableSwitch) handleExpired(fwd *interceptedForward) (
bool, error) {
height := uint32(s.currentHeight)
if fwd.packet.incomingTimeout >= height+s.cltvRejectDelta {
if fwd.packet.incomingTimeout >= height+s.cltvInterceptDelta {
return false, nil
}
@ -540,9 +583,10 @@ func (s *InterceptableSwitch) handleExpired(fwd *interceptedForward) (
// It is passed from the switch to external interceptors that are interested
// in holding forwards and resolve them manually.
type interceptedForward struct {
htlc *lnwire.UpdateAddHTLC
packet *htlcPacket
htlcSwitch *Switch
htlc *lnwire.UpdateAddHTLC
packet *htlcPacket
htlcSwitch *Switch
autoFailHeight int32
}
// Packet returns the intercepted htlc packet.
@ -560,6 +604,7 @@ func (f *interceptedForward) Packet() InterceptedPacket {
IncomingExpiry: f.packet.incomingTimeout,
CustomRecords: f.packet.customRecords,
OnionBlob: f.htlc.OnionBlob,
AutoFailHeight: f.autoFailHeight,
}
}

4
htlcswitch/interfaces.go
View File

@ -312,6 +312,10 @@ type InterceptedPacket struct {
// OnionBlob is the onion packet for the next hop
OnionBlob [lnwire.OnionPacketSize]byte
// AutoFailHeight is the block height at which this intercept will be
// failed back automatically.
AutoFailHeight int32
}
// InterceptedForward is passed to the ForwardInterceptor for every forwarded

103
htlcswitch/switch_test.go
View File

@ -3704,6 +3704,8 @@ func (m *mockForwardInterceptor) InterceptForwardHtlc(
}
func (m *mockForwardInterceptor) getIntercepted() InterceptedPacket {
m.t.Helper()
select {
case p := <-m.interceptedChan:
return p
@ -3764,11 +3766,12 @@ func assertOutgoingLinkReceiveIntercepted(t *testing.T,
type interceptableSwitchTestContext struct {
t *testing.T
preimage [sha256.Size]byte
rhash [32]byte
onionBlob [1366]byte
incomingHtlcID uint64
cltvRejectDelta uint32
preimage [sha256.Size]byte
rhash [32]byte
onionBlob [1366]byte
incomingHtlcID uint64
cltvRejectDelta uint32
cltvInterceptDelta uint32
forwardInterceptor *mockForwardInterceptor
aliceChannelLink *mockChannelLink
@ -3820,12 +3823,13 @@ func newInterceptableSwitchTestContext(
preimage := [sha256.Size]byte{1}
ctx := &interceptableSwitchTestContext{
t: t,
preimage: preimage,
rhash: sha256.Sum256(preimage[:]),
onionBlob: [1366]byte{4, 5, 6},
incomingHtlcID: uint64(0),
cltvRejectDelta: 13,
t: t,
preimage: preimage,
rhash: sha256.Sum256(preimage[:]),
onionBlob: [1366]byte{4, 5, 6},
incomingHtlcID: uint64(0),
cltvRejectDelta: 10,
cltvInterceptDelta: 13,
forwardInterceptor: &mockForwardInterceptor{
t: t,
interceptedChan: make(chan InterceptedPacket),
@ -3844,7 +3848,7 @@ func (c *interceptableSwitchTestContext) createTestPacket() *htlcPacket {
return &htlcPacket{
incomingChanID: c.aliceChannelLink.ShortChanID(),
incomingHTLCID: c.incomingHtlcID,
incomingTimeout: testStartingHeight + c.cltvRejectDelta + 1,
incomingTimeout: testStartingHeight + c.cltvInterceptDelta + 1,
outgoingChanID: c.bobChannelLink.ShortChanID(),
obfuscator: NewMockObfuscator(),
htlc: &lnwire.UpdateAddHTLC{
@ -3887,9 +3891,10 @@ func TestSwitchHoldForward(t *testing.T) {
switchForwardInterceptor, err := NewInterceptableSwitch(
&InterceptableSwitchConfig{
Switch: c.s,
CltvRejectDelta: c.cltvRejectDelta,
Notifier: notifier,
Switch: c.s,
CltvRejectDelta: c.cltvRejectDelta,
CltvInterceptDelta: c.cltvInterceptDelta,
Notifier: notifier,
},
)
require.NoError(t, err)
@ -4091,6 +4096,7 @@ func TestSwitchHoldForward(t *testing.T) {
&InterceptableSwitchConfig{
Switch: c.s,
CltvRejectDelta: c.cltvRejectDelta,
CltvInterceptDelta: c.cltvInterceptDelta,
RequireInterceptor: true,
Notifier: notifier,
},
@ -4162,6 +4168,67 @@ func TestSwitchHoldForward(t *testing.T) {
}
}
func TestInterceptableSwitchWatchDog(t *testing.T) {
t.Parallel()
c := newInterceptableSwitchTestContext(t)
defer c.finish()
// Start interceptable switch.
notifier := &mock.ChainNotifier{
EpochChan: make(chan *chainntnfs.BlockEpoch, 1),
}
notifier.EpochChan <- &chainntnfs.BlockEpoch{Height: testStartingHeight}
switchForwardInterceptor, err := NewInterceptableSwitch(
&InterceptableSwitchConfig{
Switch: c.s,
CltvRejectDelta: c.cltvRejectDelta,
CltvInterceptDelta: c.cltvInterceptDelta,
Notifier: notifier,
},
)
require.NoError(t, err)
require.NoError(t, switchForwardInterceptor.Start())
// Set interceptor.
switchForwardInterceptor.SetInterceptor(
c.forwardInterceptor.InterceptForwardHtlc,
)
// Receive a packet.
linkQuit := make(chan struct{})
packet := c.createTestPacket()
err = switchForwardInterceptor.ForwardPackets(linkQuit, false, packet)
require.NoError(t, err, "can't forward htlc packet")
// Intercept the packet.
intercepted := c.forwardInterceptor.getIntercepted()
require.Equal(t,
int32(packet.incomingTimeout-c.cltvRejectDelta),
intercepted.AutoFailHeight,
)
// Htlc expires before a resolution from the interceptor.
notifier.EpochChan <- &chainntnfs.BlockEpoch{
Height: int32(packet.incomingTimeout) -
int32(c.cltvRejectDelta),
}
// Expect the htlc to be failed back.
assertOutgoingLinkReceive(t, c.aliceChannelLink, true)
// It is too late now to resolve. Expect an error.
require.Error(t, switchForwardInterceptor.Resolve(&FwdResolution{
Action: FwdActionSettle,
Key: intercepted.IncomingCircuit,
Preimage: c.preimage,
}))
}
// TestSwitchDustForwarding tests that the switch properly fails HTLC's which
// have incoming or outgoing links that breach their dust thresholds.
func TestSwitchDustForwarding(t *testing.T) {
@ -5395,8 +5462,10 @@ func testSwitchAliasInterceptFail(t *testing.T, zeroConf bool) {
interceptSwitch, err := NewInterceptableSwitch(
&InterceptableSwitchConfig{
Switch: s,
Notifier: notifier,
Switch: s,
Notifier: notifier,
CltvRejectDelta: 10,
CltvInterceptDelta: 13,
},
)
require.NoError(t, err)

7
lncfg/config.go
View File

@ -40,6 +40,13 @@ const (
// push us in the broadcast window.
DefaultFinalCltvRejectDelta = DefaultIncomingBroadcastDelta + 3
// DefaultCltvInterceptDelta defines the number of blocks before the
// expiry of the htlc where we don't intercept anymore. This value must
// be greater than CltvRejectDelta, because we don't want to offer htlcs
// to the interceptor client for which there is no time left to resolve
// them anymore.
DefaultCltvInterceptDelta = DefaultFinalCltvRejectDelta + 3
// DefaultOutgoingBroadcastDelta defines the number of blocks before the
// expiry of an outgoing htlc at which we force close the channel. We
// are not in a hurry to force close, because there is nothing to claim

1
lnrpc/routerrpc/forward_interceptor.go
View File

@ -90,6 +90,7 @@ func (r *forwardInterceptor) onIntercept(
IncomingExpiry: htlc.IncomingExpiry,
CustomRecords: htlc.CustomRecords,
OnionBlob: htlc.OnionBlob[:],
AutoFailHeight: htlc.AutoFailHeight,
}
return r.stream.Send(interceptionRequest)

386
lnrpc/routerrpc/router.pb.go
View File

@ -2590,6 +2590,9 @@ type ForwardHtlcInterceptRequest struct {
CustomRecords map[uint64][]byte `protobuf:"bytes,8,rep,name=custom_records,json=customRecords,proto3" json:"custom_records,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
// The onion blob for the next hop
OnionBlob []byte `protobuf:"bytes,9,opt,name=onion_blob,json=onionBlob,proto3" json:"onion_blob,omitempty"`
// The block height at which this htlc will be auto-failed to prevent the
// channel from force-closing.
AutoFailHeight int32 `protobuf:"varint,10,opt,name=auto_fail_height,json=autoFailHeight,proto3" json:"auto_fail_height,omitempty"`
}
func (x *ForwardHtlcInterceptRequest) Reset() {
@ -2687,6 +2690,13 @@ func (x *ForwardHtlcInterceptRequest) GetOnionBlob() []byte {
return nil
}
func (x *ForwardHtlcInterceptRequest) GetAutoFailHeight() int32 {
if x != nil {
return x.AutoFailHeight
}
return 0
}
// *
// ForwardHtlcInterceptResponse enables the caller to resolve a previously hold
// forward. The caller can choose either to:
@ -3178,7 +3188,7 @@ var file_routerrpc_router_proto_rawDesc = []byte{
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@ -3210,194 +3220,196 @@ var file_routerrpc_router_proto_rawDesc = []byte{
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}
var (

4
lnrpc/routerrpc/router.proto
View File

@ -792,6 +792,10 @@ message ForwardHtlcInterceptRequest {
// The onion blob for the next hop
bytes onion_blob = 9;
// The block height at which this htlc will be auto-failed to prevent the
// channel from force-closing.
int32 auto_fail_height = 10;
}
/**

5
lnrpc/routerrpc/router.swagger.json
View File

@ -1229,6 +1229,11 @@
"type": "string",
"format": "byte",
"title": "The onion blob for the next hop"
},
"auto_fail_height": {
"type": "integer",
"format": "int32",
"description": "The block height at which this htlc will be auto-failed to prevent the\nchannel from force-closing."
}
}
},

5
peer/test_utils.go
View File

@ -368,8 +368,9 @@ func createTestPeer(t *testing.T, notifier chainntnfs.ChainNotifier,
interceptableSwitch, err := htlcswitch.NewInterceptableSwitch(
&htlcswitch.InterceptableSwitchConfig{
CltvRejectDelta: testCltvRejectDelta,
Notifier: interceptableSwitchNotifier,
CltvRejectDelta: testCltvRejectDelta,
CltvInterceptDelta: testCltvRejectDelta + 3,
Notifier: interceptableSwitchNotifier,
},
)
if err != nil {

1
server.go
View File

@ -670,6 +670,7 @@ func newServer(cfg *Config, listenAddrs []net.Addr,
&htlcswitch.InterceptableSwitchConfig{
Switch: s.htlcSwitch,
CltvRejectDelta: lncfg.DefaultFinalCltvRejectDelta,
CltvInterceptDelta: lncfg.DefaultCltvInterceptDelta,
RequireInterceptor: s.cfg.RequireInterceptor,
Notifier: s.cc.ChainNotifier,
},