diff --git a/config.go b/config.go index 7084500b4bb..6c8df62dda5 100644 --- a/config.go +++ b/config.go @@ -627,9 +627,8 @@ func DefaultConfig() Config { RejectCacheSize: channeldb.DefaultRejectCacheSize, ChannelCacheSize: channeldb.DefaultChannelCacheSize, }, - Prometheus: lncfg.DefaultPrometheus(), - Watchtower: lncfg.DefaultWatchtowerCfg(defaultTowerDir), - ProtocolOptions: lncfg.DefaultProtocol(), + Prometheus: lncfg.DefaultPrometheus(), + Watchtower: lncfg.DefaultWatchtowerCfg(defaultTowerDir), HealthChecks: &lncfg.HealthCheckConfig{ ChainCheck: &lncfg.CheckConfig{ Interval: defaultChainInterval, diff --git a/contractcourt/htlc_incoming_contest_resolver.go b/contractcourt/htlc_incoming_contest_resolver.go index e73e3e45b2f..b104f8d70a6 100644 --- a/contractcourt/htlc_incoming_contest_resolver.go +++ b/contractcourt/htlc_incoming_contest_resolver.go @@ -543,7 +543,7 @@ func (h *htlcIncomingContestResolver) decodePayload() (*hop.Payload, return nil, nil, err } - payload, err := iterator.HopPayload() + payload, _, err := iterator.HopPayload() if err != nil { return nil, nil, err } diff --git a/contractcourt/htlc_incoming_contest_resolver_test.go b/contractcourt/htlc_incoming_contest_resolver_test.go index 6c4ba6bc480..55d93a6fb37 100644 --- a/contractcourt/htlc_incoming_contest_resolver_test.go +++ b/contractcourt/htlc_incoming_contest_resolver_test.go @@ -263,7 +263,7 @@ type mockHopIterator struct { hop.Iterator } -func (h *mockHopIterator) HopPayload() (*hop.Payload, error) { +func (h *mockHopIterator) HopPayload() (*hop.Payload, hop.RouteRole, error) { var nextAddress [8]byte if !h.isExit { nextAddress = [8]byte{0x01} @@ -275,7 +275,7 @@ func (h *mockHopIterator) HopPayload() (*hop.Payload, error) { ForwardAmount: 100, OutgoingCltv: 40, ExtraBytes: [12]byte{}, - }), nil + }), hop.RouteRoleCleartext, nil } func (h *mockHopIterator) EncodeNextHop(w io.Writer) error { diff --git a/docs/release-notes/release-notes-0.18.0.md b/docs/release-notes/release-notes-0.18.0.md index ff4a947d868..3135764ff7e 100644 --- a/docs/release-notes/release-notes-0.18.0.md +++ b/docs/release-notes/release-notes-0.18.0.md @@ -211,8 +211,11 @@ bitcoin peers' feefilter values into account](https://github.com/lightningnetwor * [Preparatory work](https://github.com/lightningnetwork/lnd/pull/8159) for forwarding of blinded routes was added, along with [support](https://github.com/lightningnetwork/lnd/pull/8160) - for forwarding blinded payments. Forwarding of blinded payments is disabled - by default, and the feature is not yet advertised to the network. + for forwarding blinded payments and [error handling](https://github.com/lightningnetwork/lnd/pull/8485). + With this change, LND is now eligible to be selected as part of a blinded + route and can forward payments on behalf of nodes that have support for + receiving to blinded paths. This upgrade provides a meaningful improvement + to the anonymity set and usability of blinded paths in the Lightning Network. * Introduced [fee bumper](https://github.com/lightningnetwork/lnd/pull/8424) to handle bumping the fees of sweeping transactions properly. A diff --git a/feature/default_sets.go b/feature/default_sets.go index 3b7e0f7ea3b..cc802fe8593 100644 --- a/feature/default_sets.go +++ b/feature/default_sets.go @@ -79,6 +79,11 @@ var defaultSetDesc = setDesc{ SetInit: {}, // I SetNodeAnn: {}, // N }, + lnwire.RouteBlindingOptional: { + SetInit: {}, // I + SetNodeAnn: {}, // N + SetInvoice: {}, // 9 + }, lnwire.ShutdownAnySegwitOptional: { SetInit: {}, // I SetNodeAnn: {}, // N diff --git a/feature/deps.go b/feature/deps.go index b9fec2da08e..350d49acf31 100644 --- a/feature/deps.go +++ b/feature/deps.go @@ -79,6 +79,12 @@ var deps = depDesc{ lnwire.AnchorsZeroFeeHtlcTxOptional: {}, lnwire.ExplicitChannelTypeOptional: {}, }, + lnwire.RouteBlindingOptional: { + lnwire.TLVOnionPayloadOptional: {}, + }, + lnwire.RouteBlindingRequired: { + lnwire.TLVOnionPayloadRequired: {}, + }, } // ValidateDeps asserts that a feature vector sets all features and their diff --git a/feature/manager.go b/feature/manager.go index 98317eb8f15..c7029e89382 100644 --- a/feature/manager.go +++ b/feature/manager.go @@ -60,6 +60,9 @@ type Config struct { // segwit witness versions for co-op closes. NoAnySegwit bool + // NoRouteBlinding unsets route blinding feature bits. + NoRouteBlinding bool + // CustomFeatures is a set of custom features to advertise in each // set. CustomFeatures map[Set][]lnwire.FeatureBit @@ -123,6 +126,8 @@ func newManager(cfg Config, desc setDesc) (*Manager, error) { raw.Unset(lnwire.PaymentAddrRequired) raw.Unset(lnwire.MPPOptional) raw.Unset(lnwire.MPPRequired) + raw.Unset(lnwire.RouteBlindingOptional) + raw.Unset(lnwire.RouteBlindingRequired) raw.Unset(lnwire.AMPOptional) raw.Unset(lnwire.AMPRequired) raw.Unset(lnwire.KeysendOptional) @@ -179,7 +184,10 @@ func newManager(cfg Config, desc setDesc) (*Manager, error) { raw.Unset(lnwire.SimpleTaprootChannelsOptionalStaging) raw.Unset(lnwire.SimpleTaprootChannelsRequiredStaging) } - + if cfg.NoRouteBlinding { + raw.Unset(lnwire.RouteBlindingOptional) + raw.Unset(lnwire.RouteBlindingRequired) + } for _, custom := range cfg.CustomFeatures[set] { if custom > set.Maximum() { return nil, fmt.Errorf("feature bit: %v "+ diff --git a/htlcswitch/circuit.go b/htlcswitch/circuit.go index efb2a477905..700b087f522 100644 --- a/htlcswitch/circuit.go +++ b/htlcswitch/circuit.go @@ -205,6 +205,12 @@ func (c *PaymentCircuit) Decode(r io.Reader) error { // Test encrypter. c.ErrorEncrypter = NewMockObfuscator() + case hop.EncrypterTypeIntroduction: + c.ErrorEncrypter = hop.NewIntroductionErrorEncrypter() + + case hop.EncrypterTypeRelaying: + c.ErrorEncrypter = hop.NewRelayingErrorEncrypter() + default: return UnknownEncrypterType(encrypterType) } diff --git a/htlcswitch/hop/error_encryptor.go b/htlcswitch/hop/error_encryptor.go index 7b6a3dd1a53..23272ec00d4 100644 --- a/htlcswitch/hop/error_encryptor.go +++ b/htlcswitch/hop/error_encryptor.go @@ -25,8 +25,26 @@ const ( // EncrypterTypeMock is used to identify a mock obfuscator instance. EncrypterTypeMock = 2 + + // EncrypterTypeIntroduction is used to identify a sphinx onion error + // encrypter where we are the introduction node in a blinded route. It + // has the same functionality as EncrypterTypeSphinx, but is used to + // mark our special-case error handling. + EncrypterTypeIntroduction = 3 + + // EncrypterTypeRelaying is used to identify a sphinx onion error + // encryper where we are a relaying node in a blinded route. It has + // the same functionality as a EncrypterTypeSphinx, but is used to mark + // our special-case error handling. + EncrypterTypeRelaying = 4 ) +// IsBlinded returns a boolean indicating whether the error encrypter belongs +// to a blinded route. +func (e EncrypterType) IsBlinded() bool { + return e == EncrypterTypeIntroduction || e == EncrypterTypeRelaying +} + // ErrorEncrypterExtracter defines a function signature that extracts an // ErrorEncrypter from an sphinx OnionPacket. type ErrorEncrypterExtracter func(*btcec.PublicKey) (ErrorEncrypter, @@ -197,9 +215,72 @@ func (s *SphinxErrorEncrypter) Reextract( s.OnionErrorEncrypter = sphinxEncrypter.OnionErrorEncrypter return nil - } // A compile time check to ensure SphinxErrorEncrypter implements the // ErrorEncrypter interface. var _ ErrorEncrypter = (*SphinxErrorEncrypter)(nil) + +// A compile time check to ensure that IntroductionErrorEncrypter implements +// the ErrorEncrypter interface. +var _ ErrorEncrypter = (*IntroductionErrorEncrypter)(nil) + +// IntroductionErrorEncrypter is a wrapper type on SphinxErrorEncrypter which +// is used to signal that we have special HTLC error handling for this hop. +type IntroductionErrorEncrypter struct { + // ErrorEncrypter is the underlying error encrypter, embedded + // directly in the struct so that we don't have to re-implement the + // ErrorEncrypter interface. + ErrorEncrypter +} + +// NewIntroductionErrorEncrypter returns a blank IntroductionErrorEncrypter. +func NewIntroductionErrorEncrypter() *IntroductionErrorEncrypter { + return &IntroductionErrorEncrypter{ + ErrorEncrypter: NewSphinxErrorEncrypter(), + } +} + +// Type returns the identifier for an introduction error encrypter. +func (i *IntroductionErrorEncrypter) Type() EncrypterType { + return EncrypterTypeIntroduction +} + +// Reextract rederives the error encrypter from the currently held EphemeralKey, +// relying on the logic in the underlying SphinxErrorEncrypter. +func (i *IntroductionErrorEncrypter) Reextract( + extract ErrorEncrypterExtracter) error { + + return i.ErrorEncrypter.Reextract(extract) +} + +// A compile time check to ensure that RelayingErrorEncrypte implements +// the ErrorEncrypter interface. +var _ ErrorEncrypter = (*RelayingErrorEncrypter)(nil) + +// RelayingErrorEncrypter is a wrapper type on SphinxErrorEncrypter which +// is used to signal that we have special HTLC error handling for this hop. +type RelayingErrorEncrypter struct { + ErrorEncrypter +} + +// NewRelayingErrorEncrypter returns a blank RelayingErrorEncrypter with +// an underlying SphinxErrorEncrypter. +func NewRelayingErrorEncrypter() *RelayingErrorEncrypter { + return &RelayingErrorEncrypter{ + ErrorEncrypter: NewSphinxErrorEncrypter(), + } +} + +// Type returns the identifier for a relaying error encrypter. +func (r *RelayingErrorEncrypter) Type() EncrypterType { + return EncrypterTypeRelaying +} + +// Reextract rederives the error encrypter from the currently held EphemeralKey, +// relying on the logic in the underlying SphinxErrorEncrypter. +func (r *RelayingErrorEncrypter) Reextract( + extract ErrorEncrypterExtracter) error { + + return r.ErrorEncrypter.Reextract(extract) +} diff --git a/htlcswitch/hop/fuzz_test.go b/htlcswitch/hop/fuzz_test.go index cbbe882601f..e5c00b52571 100644 --- a/htlcswitch/hop/fuzz_test.go +++ b/htlcswitch/hop/fuzz_test.go @@ -97,19 +97,37 @@ func hopFromPayload(p *Payload) (*route.Hop, uint64) { // FuzzPayloadFinal fuzzes final hop payloads, providing the additional context // that the hop should be final (which is usually obtained by the structure -// of the sphinx packet). -func FuzzPayloadFinal(f *testing.F) { - fuzzPayload(f, true) +// of the sphinx packet) for the case where a blinding point was provided in +// UpdateAddHtlc. +func FuzzPayloadFinalBlinding(f *testing.F) { + fuzzPayload(f, true, true) +} + +// FuzzPayloadFinal fuzzes final hop payloads, providing the additional context +// that the hop should be final (which is usually obtained by the structure +// of the sphinx packet) for the case where no blinding point was provided in +// UpdateAddHtlc. +func FuzzPayloadFinalNoBlinding(f *testing.F) { + fuzzPayload(f, true, false) } // FuzzPayloadIntermediate fuzzes intermediate hop payloads, providing the // additional context that a hop should be intermediate (which is usually -// obtained by the structure of the sphinx packet). -func FuzzPayloadIntermediate(f *testing.F) { - fuzzPayload(f, false) +// obtained by the structure of the sphinx packet) for the case where a +// blinding point was provided in UpdateAddHtlc. +func FuzzPayloadIntermediateBlinding(f *testing.F) { + fuzzPayload(f, false, true) } -func fuzzPayload(f *testing.F, finalPayload bool) { +// FuzzPayloadIntermediate fuzzes intermediate hop payloads, providing the +// additional context that a hop should be intermediate (which is usually +// obtained by the structure of the sphinx packet) for the case where no +// blinding point was provided in UpdateAddHtlc. +func FuzzPayloadIntermediateNoBlinding(f *testing.F) { + fuzzPayload(f, false, false) +} + +func fuzzPayload(f *testing.F, finalPayload, updateAddBlinded bool) { f.Fuzz(func(t *testing.T, data []byte) { if len(data) > sphinx.MaxPayloadSize { return @@ -117,17 +135,23 @@ func fuzzPayload(f *testing.F, finalPayload bool) { r := bytes.NewReader(data) - payload1, _, err := NewPayloadFromReader(r, finalPayload) + payload1, parsed, err := ParseTLVPayload(r) if err != nil { return } + if err = ValidateParsedPayloadTypes( + parsed, finalPayload, updateAddBlinded, + ); err != nil { + return + } + var b bytes.Buffer hop, nextChanID := hopFromPayload(payload1) err = hop.PackHopPayload(&b, nextChanID, finalPayload) switch { // PackHopPayload refuses to encode an AMP record - // without an MPP record. However, NewPayloadFromReader + // without an MPP record. However, ValidateParsedPayloadTypes // does allow decoding an AMP record without an MPP // record, since validation is done at a later stage. Do // not report a bug for this case. @@ -136,9 +160,9 @@ func fuzzPayload(f *testing.F, finalPayload bool) { // PackHopPayload will not encode regular payloads or final // hops in blinded routes that do not have an amount or expiry - // TLV set. However, NewPayloadFromReader will allow creation - // of payloads where these TLVs are present, but they have - // zero values because validation is done at a later stage. + // TLV set. However, ValidateParsedPayloadTypes will allow + // creation of payloads where these TLVs are present, but they + // have zero values because validation is done at a later stage. case errors.Is(err, route.ErrMissingField): return @@ -146,7 +170,12 @@ func fuzzPayload(f *testing.F, finalPayload bool) { require.NoError(t, err) } - payload2, _, err := NewPayloadFromReader(&b, finalPayload) + payload2, parsed, err := ParseTLVPayload(&b) + require.NoError(t, err) + + err = ValidateParsedPayloadTypes( + parsed, finalPayload, updateAddBlinded, + ) require.NoError(t, err) require.Equal(t, payload1, payload2) diff --git a/htlcswitch/hop/iterator.go b/htlcswitch/hop/iterator.go index df6f5aac727..a89f1b7347c 100644 --- a/htlcswitch/hop/iterator.go +++ b/htlcswitch/hop/iterator.go @@ -17,8 +17,69 @@ import ( var ( // ErrDecodeFailed is returned when we can't decode blinded data. ErrDecodeFailed = errors.New("could not decode blinded data") + + // ErrNoBlindingPoint is returned when we have not provided a blinding + // point for a validated payload with encrypted data set. + ErrNoBlindingPoint = errors.New("no blinding point set for validated " + + "blinded hop") +) + +// RouteRole represents the different types of roles a node can have as a +// recipient of a HTLC. +type RouteRole uint8 + +const ( + // RouteRoleCleartext represents a regular route hop. + RouteRoleCleartext RouteRole = iota + + // RouteRoleIntroduction represents an introduction node in a blinded + // path, characterized by a blinding point in the onion payload. + RouteRoleIntroduction + + // RouteRoleRelaying represents a relaying node in a blinded path, + // characterized by a blinding point in update_add_htlc. + RouteRoleRelaying ) +// String representation of a role in a route. +func (h RouteRole) String() string { + switch h { + case RouteRoleCleartext: + return "cleartext" + + case RouteRoleRelaying: + return "blinded relay" + + case RouteRoleIntroduction: + return "introduction node" + + default: + return fmt.Sprintf("unknown route role: %d", h) + } +} + +// NewRouteRole returns the role we're playing in a route depending on the +// blinding points set (or not). If we are in the situation where we received +// blinding points in both the update add message and the payload: +// - We must have had a valid update add blinding point, because we were able +// to decrypt our onion to get the payload blinding point. +// - We return a relaying node role, because an introduction node (by +// definition) does not receive a blinding point in update add. +// - We assume the sending node to be buggy (including a payload blinding +// where it shouldn't), and rely on validation elsewhere to handle this. +func NewRouteRole(updateAddBlinding, payloadBlinding bool) RouteRole { + switch { + case updateAddBlinding: + return RouteRoleRelaying + + case payloadBlinding: + return RouteRoleIntroduction + + default: + return RouteRoleCleartext + } +} + // Iterator is an interface that abstracts away the routing information // included in HTLC's which includes the entirety of the payment path of an // HTLC. This interface provides two basic method which carry out: how to @@ -30,8 +91,11 @@ type Iterator interface { // information encoded within the returned ForwardingInfo is to be used // by each hop to authenticate the information given to it by the prior // hop. The payload will also contain any additional TLV fields provided - // by the sender. - HopPayload() (*Payload, error) + // by the sender. The role that this hop plays in the context of + // route blinding (regular, introduction or relaying) is returned + // whenever the payload is successfully parsed, even if we subsequently + // face a validation error. + HopPayload() (*Payload, RouteRole, error) // EncodeNextHop encodes the onion packet destined for the next hop // into the passed io.Writer. @@ -39,8 +103,8 @@ type Iterator interface { // ExtractErrorEncrypter returns the ErrorEncrypter needed for this hop, // along with a failure code to signal if the decoding was successful. - ExtractErrorEncrypter(ErrorEncrypterExtracter) (ErrorEncrypter, - lnwire.FailCode) + ExtractErrorEncrypter(extractor ErrorEncrypterExtracter, + introductionNode bool) (ErrorEncrypter, lnwire.FailCode) } // sphinxHopIterator is the Sphinx implementation of hop iterator which uses @@ -90,29 +154,56 @@ func (r *sphinxHopIterator) EncodeNextHop(w io.Writer) error { // HopPayload returns the set of fields that detail exactly _how_ this hop // should forward the HTLC to the next hop. Additionally, the information // encoded within the returned ForwardingInfo is to be used by each hop to -// authenticate the information given to it by the prior hop. The payload will -// also contain any additional TLV fields provided by the sender. +// authenticate the information given to it by the prior hop. The role that +// this hop plays in the context of route blinding (regular, introduction or +// relaying) is returned whenever the payload is successfully parsed, even if +// we subsequently face a validation error. The payload will also contain any +// additional TLV fields provided by the sender. // // NOTE: Part of the HopIterator interface. -func (r *sphinxHopIterator) HopPayload() (*Payload, error) { +func (r *sphinxHopIterator) HopPayload() (*Payload, RouteRole, error) { switch r.processedPacket.Payload.Type { // If this is the legacy payload, then we'll extract the information // directly from the pre-populated ForwardingInstructions field. case sphinx.PayloadLegacy: fwdInst := r.processedPacket.ForwardingInstructions - return NewLegacyPayload(fwdInst), nil + return NewLegacyPayload(fwdInst), RouteRoleCleartext, nil // Otherwise, if this is the TLV payload, then we'll make a new stream // to decode only what we need to make routing decisions. case sphinx.PayloadTLV: isFinal := r.processedPacket.Action == sphinx.ExitNode - payload, parsed, err := NewPayloadFromReader( + payload, parsed, err := ParseTLVPayload( bytes.NewReader(r.processedPacket.Payload.Payload), - isFinal, ) if err != nil { - return nil, err + // If we couldn't even parse our payload then we do + // a best-effort of determining our role in a blinded + // route, accepting that we can't know whether we + // were the introduction node (as the payload + // is not parseable). + routeRole := RouteRoleCleartext + if r.blindingKit.UpdateAddBlinding.IsSome() { + routeRole = RouteRoleRelaying + } + + return nil, routeRole, err + } + + // Now that we've parsed our payload we can determine which + // role we're playing in the route. + _, payloadBlinding := parsed[record.BlindingPointOnionType] + routeRole := NewRouteRole( + r.blindingKit.UpdateAddBlinding.IsSome(), + payloadBlinding, + ) + + if err := ValidateTLVPayload( + parsed, isFinal, + r.blindingKit.UpdateAddBlinding.IsSome(), + ); err != nil { + return nil, routeRole, err } // If we had an encrypted data payload present, pull out our @@ -122,17 +213,18 @@ func (r *sphinxHopIterator) HopPayload() (*Payload, error) { payload, isFinal, parsed, ) if err != nil { - return nil, err + return nil, routeRole, err } payload.FwdInfo = *fwdInfo } - return payload, err + return payload, routeRole, nil default: - return nil, fmt.Errorf("unknown sphinx payload type: %v", - r.processedPacket.Payload.Type) + return nil, RouteRoleCleartext, + fmt.Errorf("unknown sphinx payload type: %v", + r.processedPacket.Payload.Type) } } @@ -143,9 +235,31 @@ func (r *sphinxHopIterator) HopPayload() (*Payload, error) { // // NOTE: Part of the HopIterator interface. func (r *sphinxHopIterator) ExtractErrorEncrypter( - extracter ErrorEncrypterExtracter) (ErrorEncrypter, lnwire.FailCode) { + extracter ErrorEncrypterExtracter, introductionNode bool) ( + ErrorEncrypter, lnwire.FailCode) { + + encrypter, errCode := extracter(r.ogPacket.EphemeralKey) + if errCode != lnwire.CodeNone { + return nil, errCode + } + + // If we're in a blinded path, wrap the error encrypter that we just + // derived in a "marker" type which we'll use to know what type of + // error we're handling. + switch { + case introductionNode: + return &IntroductionErrorEncrypter{ + ErrorEncrypter: encrypter, + }, errCode + + case r.blindingKit.UpdateAddBlinding.IsSome(): + return &RelayingErrorEncrypter{ + ErrorEncrypter: encrypter, + }, errCode - return extracter(r.ogPacket.EphemeralKey) + default: + return encrypter, errCode + } } // BlindingProcessor is an interface that provides the cryptographic operations @@ -182,35 +296,16 @@ type BlindingKit struct { IncomingAmount lnwire.MilliSatoshi } -// validateBlindingPoint validates that only one blinding point is present for -// the hop and returns the relevant one. -func (b *BlindingKit) validateBlindingPoint(payloadBlinding *btcec.PublicKey, - isFinalHop bool) (*btcec.PublicKey, error) { - - // Bolt 04: if encrypted_recipient_data is present: - // - if blinding_point (in update add) is set: - // - MUST error if current_blinding_point is set (in payload) - // - otherwise: - // - MUST return an error if current_blinding_point is not present - // (in payload) +// getBlindingPoint returns either the payload or updateAddHtlc blinding point, +// assuming that validation that these values are appropriately set has already +// been handled elsewhere. +func (b *BlindingKit) getBlindingPoint(payloadBlinding *btcec.PublicKey) ( + *btcec.PublicKey, error) { + payloadBlindingSet := payloadBlinding != nil updateBlindingSet := b.UpdateAddBlinding.IsSome() switch { - case !(payloadBlindingSet || updateBlindingSet): - return nil, ErrInvalidPayload{ - Type: record.BlindingPointOnionType, - Violation: OmittedViolation, - FinalHop: isFinalHop, - } - - case payloadBlindingSet && updateBlindingSet: - return nil, ErrInvalidPayload{ - Type: record.BlindingPointOnionType, - Violation: IncludedViolation, - FinalHop: isFinalHop, - } - case payloadBlindingSet: return payloadBlinding, nil @@ -223,9 +318,10 @@ func (b *BlindingKit) validateBlindingPoint(payloadBlinding *btcec.PublicKey, } return pk.Val, nil - } - return nil, fmt.Errorf("expected blinded point set") + default: + return nil, ErrNoBlindingPoint + } } // DecryptAndValidateFwdInfo performs all operations required to decrypt and @@ -235,11 +331,10 @@ func (b *BlindingKit) DecryptAndValidateFwdInfo(payload *Payload, *ForwardingInfo, error) { // We expect this function to be called when we have encrypted data - // present, and a blinding key is set either in the payload or the + // present, and expect validation to already have ensured that a + // blinding key is set either in the payload or the // update_add_htlc message. - blindingPoint, err := b.validateBlindingPoint( - payload.blindingPoint, isFinalHop, - ) + blindingPoint, err := b.getBlindingPoint(payload.blindingPoint) if err != nil { return nil, err } diff --git a/htlcswitch/hop/iterator_test.go b/htlcswitch/hop/iterator_test.go index 60919333b37..e69361b0a4b 100644 --- a/htlcswitch/hop/iterator_test.go +++ b/htlcswitch/hop/iterator_test.go @@ -88,10 +88,10 @@ func TestSphinxHopIteratorForwardingInstructions(t *testing.T) { for i, testCase := range testCases { iterator.processedPacket = testCase.sphinxPacket - pld, err := iterator.HopPayload() - if err != nil { + pld, _, pldErr := iterator.HopPayload() + if pldErr != nil { t.Fatalf("#%v: unable to extract forwarding "+ - "instructions: %v", i, err) + "instructions: %v", i, pldErr) } fwdInfo := pld.ForwardingInfo() @@ -216,24 +216,10 @@ func TestDecryptAndValidateFwdInfo(t *testing.T) { expectedErr error }{ { - name: "no blinding point", - data: validData, - processor: &mockProcessor{}, - expectedErr: ErrInvalidPayload{ - Type: record.BlindingPointOnionType, - Violation: OmittedViolation, - }, - }, - { - name: "both blinding points", - data: validData, - updateAddBlinding: &btcec.PublicKey{}, - payloadBlinding: &btcec.PublicKey{}, - processor: &mockProcessor{}, - expectedErr: ErrInvalidPayload{ - Type: record.BlindingPointOnionType, - Violation: IncludedViolation, - }, + name: "no blinding point", + data: validData, + processor: &mockProcessor{}, + expectedErr: ErrNoBlindingPoint, }, { name: "decryption failed", @@ -265,12 +251,19 @@ func TestDecryptAndValidateFwdInfo(t *testing.T) { }, }, { - name: "valid", + name: "valid using update add", updateAddBlinding: &btcec.PublicKey{}, data: validData, processor: &mockProcessor{}, expectedErr: nil, }, + { + name: "valid using payload", + payloadBlinding: &btcec.PublicKey{}, + data: validData, + processor: &mockProcessor{}, + expectedErr: nil, + }, } for _, testCase := range tests { diff --git a/htlcswitch/hop/payload.go b/htlcswitch/hop/payload.go index 70fdb1403fc..9e717bbd26b 100644 --- a/htlcswitch/hop/payload.go +++ b/htlcswitch/hop/payload.go @@ -133,14 +133,10 @@ func NewLegacyPayload(f *sphinx.HopData) *Payload { } } -// NewPayloadFromReader builds a new Hop from the passed io.Reader and returns -// a map of all the types that were found in the payload. The reader -// should correspond to the bytes encapsulated in a TLV onion payload. The -// final hop bool signals that this payload was the final packet parsed by -// sphinx. -func NewPayloadFromReader(r io.Reader, finalHop bool) (*Payload, - map[tlv.Type][]byte, error) { - +// ParseTLVPayload builds a new Hop from the passed io.Reader and returns +// a map of all the types that were found in the payload. This function +// does not perform validation of TLV types included in the payload. +func ParseTLVPayload(r io.Reader) (*Payload, map[tlv.Type][]byte, error) { var ( cid uint64 amt uint64 @@ -175,23 +171,6 @@ func NewPayloadFromReader(r io.Reader, finalHop bool) (*Payload, return nil, nil, err } - // Validate whether the sender properly included or omitted tlv records - // in accordance with BOLT 04. - err = ValidateParsedPayloadTypes(parsedTypes, finalHop) - if err != nil { - return nil, nil, err - } - - // Check for violation of the rules for mandatory fields. - violatingType := getMinRequiredViolation(parsedTypes) - if violatingType != nil { - return nil, nil, ErrInvalidPayload{ - Type: *violatingType, - Violation: RequiredViolation, - FinalHop: finalHop, - } - } - // If no MPP field was parsed, set the MPP field on the resulting // payload to nil. if _, ok := parsedTypes[record.MPPOnionType]; !ok { @@ -232,7 +211,34 @@ func NewPayloadFromReader(r io.Reader, finalHop bool) (*Payload, blindingPoint: blindingPoint, customRecords: customRecords, totalAmtMsat: lnwire.MilliSatoshi(totalAmtMsat), - }, nil, nil + }, parsedTypes, nil +} + +// ValidateTLVPayload validates the TLV fields that were included in a TLV +// payload. +func ValidateTLVPayload(parsedTypes map[tlv.Type][]byte, + finalHop bool, updateAddBlinding bool) error { + + // Validate whether the sender properly included or omitted tlv records + // in accordance with BOLT 04. + err := ValidateParsedPayloadTypes( + parsedTypes, finalHop, updateAddBlinding, + ) + if err != nil { + return err + } + + // Check for violation of the rules for mandatory fields. + violatingType := getMinRequiredViolation(parsedTypes) + if violatingType != nil { + return ErrInvalidPayload{ + Type: *violatingType, + Violation: RequiredViolation, + FinalHop: finalHop, + } + } + + return nil } // ForwardingInfo returns the basic parameters required for HTLC forwarding, @@ -259,7 +265,7 @@ func NewCustomRecords(parsedTypes tlv.TypeMap) record.CustomSet { // boolean should be true if the payload was parsed for an exit hop. The // requirements for this method are described in BOLT 04. func ValidateParsedPayloadTypes(parsedTypes tlv.TypeMap, - isFinalHop bool) error { + isFinalHop, updateAddBlinding bool) error { _, hasAmt := parsedTypes[record.AmtOnionType] _, hasLockTime := parsedTypes[record.LockTimeOnionType] @@ -267,6 +273,7 @@ func ValidateParsedPayloadTypes(parsedTypes tlv.TypeMap, _, hasMPP := parsedTypes[record.MPPOnionType] _, hasAMP := parsedTypes[record.AMPOnionType] _, hasEncryptedData := parsedTypes[record.EncryptedDataOnionType] + _, hasBlinding := parsedTypes[record.BlindingPointOnionType] // All cleartext hops (including final hop) and the final hop in a // blinded path require the forwading amount and expiry TLVs to be set. @@ -277,6 +284,32 @@ func ValidateParsedPayloadTypes(parsedTypes tlv.TypeMap, needNextHop := !(hasEncryptedData || isFinalHop) switch { + // Both blinding point being set is invalid. + case hasBlinding && updateAddBlinding: + return ErrInvalidPayload{ + Type: record.BlindingPointOnionType, + Violation: IncludedViolation, + FinalHop: isFinalHop, + } + + // If encrypted data is not provided, blinding points should not be + // set. + case !hasEncryptedData && (hasBlinding || updateAddBlinding): + return ErrInvalidPayload{ + Type: record.EncryptedDataOnionType, + Violation: OmittedViolation, + FinalHop: isFinalHop, + } + + // If encrypted data is present, we require that one blinding point + // is set. + case hasEncryptedData && !(hasBlinding || updateAddBlinding): + return ErrInvalidPayload{ + Type: record.EncryptedDataOnionType, + Violation: IncludedViolation, + FinalHop: isFinalHop, + } + // Hops that need forwarding info must include an amount to forward. case needFwdInfo && !hasAmt: return ErrInvalidPayload{ diff --git a/htlcswitch/hop/payload_test.go b/htlcswitch/hop/payload_test.go index 301e5771660..c22144d7b86 100644 --- a/htlcswitch/hop/payload_test.go +++ b/htlcswitch/hop/payload_test.go @@ -26,6 +26,7 @@ type decodePayloadTest struct { name string payload []byte isFinalHop bool + updateAddBlinded bool expErr error expCustomRecords map[uint64][]byte shouldHaveMPP bool @@ -271,8 +272,9 @@ var decodePayloadTests = []decodePayloadTest{ }, }, { - name: "intermediate hop with encrypted data", - isFinalHop: false, + name: "intermediate hop with encrypted data", + isFinalHop: false, + updateAddBlinded: true, payload: []byte{ // encrypted data 0x0a, 0x03, 0x03, 0x02, 0x01, @@ -365,8 +367,9 @@ var decodePayloadTests = []decodePayloadTest{ shouldHaveTotalAmt: true, }, { - name: "final blinded hop with total amount", - isFinalHop: true, + name: "final blinded hop with total amount", + isFinalHop: true, + updateAddBlinded: true, payload: []byte{ // amount 0x02, 0x00, @@ -378,8 +381,9 @@ var decodePayloadTests = []decodePayloadTest{ shouldHaveEncData: true, }, { - name: "final blinded missing amt", - isFinalHop: true, + name: "final blinded missing amt", + isFinalHop: true, + updateAddBlinded: true, payload: []byte{ // cltv 0x04, 0x00, @@ -394,8 +398,9 @@ var decodePayloadTests = []decodePayloadTest{ }, }, { - name: "final blinded missing cltv", - isFinalHop: true, + name: "final blinded missing cltv", + isFinalHop: true, + updateAddBlinded: true, payload: []byte{ // amount 0x02, 0x00, @@ -410,8 +415,9 @@ var decodePayloadTests = []decodePayloadTest{ }, }, { - name: "intermediate blinded has amount", - isFinalHop: false, + name: "intermediate blinded has amount", + isFinalHop: false, + updateAddBlinded: true, payload: []byte{ // amount 0x02, 0x00, @@ -425,8 +431,9 @@ var decodePayloadTests = []decodePayloadTest{ }, }, { - name: "intermediate blinded has expiry", - isFinalHop: false, + name: "intermediate blinded has expiry", + isFinalHop: false, + updateAddBlinded: true, payload: []byte{ // cltv 0x04, 0x00, @@ -439,6 +446,67 @@ var decodePayloadTests = []decodePayloadTest{ FinalHop: false, }, }, + { + name: "update add blinding no data", + isFinalHop: false, + payload: []byte{ + // cltv + 0x04, 0x00, + }, + updateAddBlinded: true, + expErr: hop.ErrInvalidPayload{ + Type: record.EncryptedDataOnionType, + Violation: hop.OmittedViolation, + FinalHop: false, + }, + }, + { + name: "onion blinding point no data", + isFinalHop: false, + payload: append([]byte{ + // blinding point (type / length) + 0x0c, 0x21, + }, + // blinding point (value) + testPubKey.SerializeCompressed()..., + ), + expErr: hop.ErrInvalidPayload{ + Type: record.EncryptedDataOnionType, + Violation: hop.OmittedViolation, + FinalHop: false, + }, + }, + { + name: "encrypted data no blinding", + isFinalHop: false, + payload: []byte{ + // encrypted data + 0x0a, 0x03, 0x03, 0x02, 0x01, + }, + expErr: hop.ErrInvalidPayload{ + Type: record.EncryptedDataOnionType, + Violation: hop.IncludedViolation, + }, + }, + { + name: "both blinding points", + isFinalHop: false, + updateAddBlinded: true, + payload: append([]byte{ + // encrypted data + 0x0a, 0x03, 0x03, 0x02, 0x01, + // blinding point (type / length) + 0x0c, 0x21, + }, + // blinding point (value) + testPubKey.SerializeCompressed()..., + ), + expErr: hop.ErrInvalidPayload{ + Type: record.BlindingPointOnionType, + Violation: hop.IncludedViolation, + FinalHop: false, + }, + }, } // TestDecodeHopPayloadRecordValidation asserts that parsing the payloads in the @@ -479,8 +547,13 @@ func testDecodeHopPayloadValidation(t *testing.T, test decodePayloadTest) { testChildIndex = uint32(9) ) - p, _, err := hop.NewPayloadFromReader( - bytes.NewReader(test.payload), test.isFinalHop, + p, parsedTypes, err := hop.ParseTLVPayload( + bytes.NewReader(test.payload), + ) + require.NoError(t, err) + + err = hop.ValidateTLVPayload( + parsedTypes, test.isFinalHop, test.updateAddBlinded, ) if !reflect.DeepEqual(test.expErr, err) { t.Fatalf("expected error mismatch, want: %v, got: %v", diff --git a/htlcswitch/link.go b/htlcswitch/link.go index 778e78d7008..ed3151728fd 100644 --- a/htlcswitch/link.go +++ b/htlcswitch/link.go @@ -1793,8 +1793,20 @@ func (l *channelLink) handleDownstreamPkt(pkt *htlcPacket) { htlc.ID = pkt.incomingHTLCID // We send the HTLC message to the peer which initially created - // the HTLC. - l.cfg.Peer.SendMessage(false, htlc) + // the HTLC. If the incoming blinding point is non-nil, we + // know that we are a relaying node in a blinded path. + // Otherwise, we're either an introduction node or not part of + // a blinded path at all. + if err := l.sendIncomingHTLCFailureMsg( + htlc.ID, + pkt.obfuscator, + htlc.Reason, + ); err != nil { + l.log.Errorf("unable to send HTLC failure: %v", + err) + + return + } // If the packet does not have a link failure set, it failed // further down the route so we notify a forwarding failure. @@ -2030,6 +2042,19 @@ func (l *channelLink) handleUpstreamMsg(msg lnwire.Message) { failure = &lnwire.FailInvalidOnionKey{ OnionSHA256: msg.ShaOnionBlob, } + + // Handle malformed errors that are part of a blinded route. + // This case is slightly different, because we expect every + // relaying node in the blinded portion of the route to send + // malformed errors. If we're also a relaying node, we're + // likely going to switch this error out anyway for our own + // malformed error, but we handle the case here for + // completeness. + case lnwire.CodeInvalidBlinding: + failure = &lnwire.FailInvalidBlinding{ + OnionSHA256: msg.ShaOnionBlob, + } + default: l.log.Warnf("unexpected failure code received in "+ "UpdateFailMailformedHTLC: %v", msg.FailureCode) @@ -3249,7 +3274,7 @@ func (l *channelLink) processRemoteAdds(fwdPkg *channeldb.FwdPkg, // DecodeHopIterator function which process the Sphinx packet. chanIterator, failureCode := decodeResps[i].Result() if failureCode != lnwire.CodeNone { - // If we're unable to process the onion blob than we + // If we're unable to process the onion blob then we // should send the malformed htlc error to payment // sender. l.sendMalformedHTLCError(pd.HtlcIndex, failureCode, @@ -3260,37 +3285,50 @@ func (l *channelLink) processRemoteAdds(fwdPkg *channeldb.FwdPkg, continue } - // Retrieve onion obfuscator from onion blob in order to - // produce initial obfuscation of the onion failureCode. - obfuscator, failureCode := chanIterator.ExtractErrorEncrypter( - l.cfg.ExtractErrorEncrypter, - ) - if failureCode != lnwire.CodeNone { - // If we're unable to process the onion blob than we - // should send the malformed htlc error to payment - // sender. - l.sendMalformedHTLCError( - pd.HtlcIndex, failureCode, onionBlob[:], pd.SourceRef, - ) - - l.log.Errorf("unable to decode onion "+ - "obfuscator: %v", failureCode) - continue - } - heightNow := l.cfg.BestHeight() - pld, err := chanIterator.HopPayload() - if err != nil { + pld, routeRole, pldErr := chanIterator.HopPayload() + if pldErr != nil { // If we're unable to process the onion payload, or we // received invalid onion payload failure, then we // should send an error back to the caller so the HTLC // can be canceled. var failedType uint64 - if e, ok := err.(hop.ErrInvalidPayload); ok { + + // We need to get the underlying error value, so we + // can't use errors.As as suggested by the linter. + //nolint:errorlint + if e, ok := pldErr.(hop.ErrInvalidPayload); ok { failedType = uint64(e.Type) } + // If we couldn't parse the payload, make our best + // effort at creating an error encrypter that knows + // what blinding type we were, but if we couldn't + // parse the payload we have no way of knowing whether + // we were the introduction node or not. + // + //nolint:lll + obfuscator, failCode := chanIterator.ExtractErrorEncrypter( + l.cfg.ExtractErrorEncrypter, + // We need our route role here because we + // couldn't parse or validate the payload. + routeRole == hop.RouteRoleIntroduction, + ) + if failCode != lnwire.CodeNone { + l.log.Errorf("could not extract error "+ + "encrypter: %v", pldErr) + + // We can't process this htlc, send back + // malformed. + l.sendMalformedHTLCError( + pd.HtlcIndex, failureCode, + onionBlob[:], pd.SourceRef, + ) + + continue + } + // TODO: currently none of the test unit infrastructure // is setup to handle TLV payloads, so testing this // would require implementing a separate mock iterator @@ -3303,7 +3341,29 @@ func (l *channelLink) processRemoteAdds(fwdPkg *channeldb.FwdPkg, ) l.log.Errorf("unable to decode forwarding "+ - "instructions: %v", err) + "instructions: %v", pldErr) + + continue + } + + // Retrieve onion obfuscator from onion blob in order to + // produce initial obfuscation of the onion failureCode. + obfuscator, failureCode := chanIterator.ExtractErrorEncrypter( + l.cfg.ExtractErrorEncrypter, + routeRole == hop.RouteRoleIntroduction, + ) + if failureCode != lnwire.CodeNone { + // If we're unable to process the onion blob than we + // should send the malformed htlc error to payment + // sender. + l.sendMalformedHTLCError( + pd.HtlcIndex, failureCode, onionBlob[:], + pd.SourceRef, + ) + + l.log.Errorf("unable to decode onion "+ + "obfuscator: %v", failureCode) + continue } @@ -3672,11 +3732,14 @@ func (l *channelLink) sendHTLCError(pd *lnwallet.PaymentDescriptor, return } - l.cfg.Peer.SendMessage(false, &lnwire.UpdateFailHTLC{ - ChanID: l.ChanID(), - ID: pd.HtlcIndex, - Reason: reason, - }) + // Send the appropriate failure message depending on whether we're + // in a blinded route or not. + if err := l.sendIncomingHTLCFailureMsg( + pd.HtlcIndex, e, reason, + ); err != nil { + l.log.Errorf("unable to send HTLC failure: %v", err) + return + } // Notify a link failure on our incoming link. Outgoing htlc information // is not available at this point, because we have not decrypted the @@ -3705,6 +3768,95 @@ func (l *channelLink) sendHTLCError(pd *lnwallet.PaymentDescriptor, ) } +// sendPeerHTLCFailure handles sending a HTLC failure message back to the +// peer from which the HTLC was received. This function is primarily used to +// handle the special requirements of route blinding, specifically: +// - Forwarding nodes must switch out any errors with MalformedFailHTLC +// - Introduction nodes should return regular HTLC failure messages. +// +// It accepts the original opaque failure, which will be used in the case +// that we're not part of a blinded route and an error encrypter that'll be +// used if we are the introduction node and need to present an error as if +// we're the failing party. +// +// Note: this function does not yet handle special error cases for receiving +// nodes in blinded paths, as LND does not support blinded receives. +func (l *channelLink) sendIncomingHTLCFailureMsg(htlcIndex uint64, + e hop.ErrorEncrypter, + originalFailure lnwire.OpaqueReason) error { + + var msg lnwire.Message + switch { + // Our circuit's error encrypter will be nil if this was a locally + // initiated payment. We can only hit a blinded error for a locally + // initiated payment if we allow ourselves to be picked as the + // introduction node for our own payments and in that case we + // shouldn't reach this code. To prevent the HTLC getting stuck, + // we fail it back and log an error. + // code. + case e == nil: + msg = &lnwire.UpdateFailHTLC{ + ChanID: l.ChanID(), + ID: htlcIndex, + Reason: originalFailure, + } + + l.log.Errorf("Unexpected blinded failure when "+ + "we are the sending node, incoming htlc: %v(%v)", + l.ShortChanID(), htlcIndex) + + // For cleartext hops (ie, non-blinded/normal) we don't need any + // transformation on the error message and can just send the original. + case !e.Type().IsBlinded(): + msg = &lnwire.UpdateFailHTLC{ + ChanID: l.ChanID(), + ID: htlcIndex, + Reason: originalFailure, + } + + // When we're the introduction node, we need to convert the error to + // a UpdateFailHTLC. + case e.Type() == hop.EncrypterTypeIntroduction: + l.log.Debugf("Introduction blinded node switching out failure "+ + "error: %v", htlcIndex) + + // The specification does not require that we set the onion + // blob. + failureMsg := lnwire.NewInvalidBlinding(nil) + reason, err := e.EncryptFirstHop(failureMsg) + if err != nil { + return err + } + + msg = &lnwire.UpdateFailHTLC{ + ChanID: l.ChanID(), + ID: htlcIndex, + Reason: reason, + } + + // If we are a relaying node, we need to switch out any error that + // we've received to a malformed HTLC error. + case e.Type() == hop.EncrypterTypeRelaying: + l.log.Debugf("Relaying blinded node switching out malformed "+ + "error: %v", htlcIndex) + + msg = &lnwire.UpdateFailMalformedHTLC{ + ChanID: l.ChanID(), + ID: htlcIndex, + FailureCode: lnwire.CodeInvalidBlinding, + } + + default: + return fmt.Errorf("unexpected encrypter: %d", e) + } + + if err := l.cfg.Peer.SendMessage(false, msg); err != nil { + l.log.Warnf("Send update fail failed: %v", err) + } + + return nil +} + // sendMalformedHTLCError helper function which sends the malformed HTLC update // to the payment sender. func (l *channelLink) sendMalformedHTLCError(htlcIndex uint64, diff --git a/htlcswitch/mailbox.go b/htlcswitch/mailbox.go index 99066497c76..a729e3ba505 100644 --- a/htlcswitch/mailbox.go +++ b/htlcswitch/mailbox.go @@ -738,6 +738,7 @@ func (m *memoryMailBox) FailAdd(pkt *htlcPacket) { sourceRef: pkt.sourceRef, hasSource: true, localFailure: localFailure, + obfuscator: pkt.obfuscator, linkFailure: linkError, htlc: &lnwire.UpdateFailHTLC{ Reason: reason, diff --git a/htlcswitch/mock.go b/htlcswitch/mock.go index dfa834c5837..cd3e5026b52 100644 --- a/htlcswitch/mock.go +++ b/htlcswitch/mock.go @@ -330,10 +330,10 @@ func newMockHopIterator(hops ...*hop.Payload) hop.Iterator { return &mockHopIterator{hops: hops} } -func (r *mockHopIterator) HopPayload() (*hop.Payload, error) { +func (r *mockHopIterator) HopPayload() (*hop.Payload, hop.RouteRole, error) { h := r.hops[0] r.hops = r.hops[1:] - return h, nil + return h, hop.RouteRoleCleartext, nil } func (r *mockHopIterator) ExtraOnionBlob() []byte { @@ -341,7 +341,7 @@ func (r *mockHopIterator) ExtraOnionBlob() []byte { } func (r *mockHopIterator) ExtractErrorEncrypter( - extracter hop.ErrorEncrypterExtracter) (hop.ErrorEncrypter, + extracter hop.ErrorEncrypterExtracter, _ bool) (hop.ErrorEncrypter, lnwire.FailCode) { return extracter(nil) diff --git a/htlcswitch/switch.go b/htlcswitch/switch.go index 70b819b1e45..d473d84222d 100644 --- a/htlcswitch/switch.go +++ b/htlcswitch/switch.go @@ -1297,6 +1297,11 @@ func (s *Switch) handlePacketForward(packet *htlcPacket) error { fail, isFail := htlc.(*lnwire.UpdateFailHTLC) if isFail && !packet.hasSource { + // HTLC resolutions and messages restored from disk + // don't have the obfuscator set from the original htlc + // add packet - set it here for use in blinded errors. + packet.obfuscator = circuit.ErrorEncrypter + switch { // No message to encrypt, locally sourced payment. case circuit.ErrorEncrypter == nil: @@ -1485,6 +1490,7 @@ func (s *Switch) failAddPacket(packet *htlcPacket, failure *LinkError) error { incomingTimeout: packet.incomingTimeout, outgoingTimeout: packet.outgoingTimeout, circuit: packet.circuit, + obfuscator: packet.obfuscator, linkFailure: failure, htlc: &lnwire.UpdateFailHTLC{ Reason: reason, @@ -1841,6 +1847,10 @@ out: // resolution message on restart. resolutionMsg.errChan <- nil + // Create a htlc packet for this resolution. We do + // not have some of the information that we'll need + // for blinded error handling here , so we'll rely on + // our forwarding logic to fill it in later. pkt := &htlcPacket{ outgoingChanID: resolutionMsg.SourceChan, outgoingHTLCID: resolutionMsg.HtlcIndex, @@ -2065,6 +2075,8 @@ func (s *Switch) reforwardResolutions() error { // The circuit is still open, so we can assume that the link or // switch (if we are the source) hasn't cleaned it up yet. + // We rely on our forwarding logic to fill in details that + // are not currently available to us. resPkt := &htlcPacket{ outgoingChanID: resMsg.SourceChan, outgoingHTLCID: resMsg.HtlcIndex, @@ -2214,7 +2226,8 @@ func (s *Switch) reforwardSettleFails(fwdPkgs []*channeldb.FwdPkg) { // we can continue to propagate it. This // failure originated from another node, so // the linkFailure field is not set on this - // packet. + // packet. We rely on the link to fill in + // additional circuit information for us. failPacket := &htlcPacket{ outgoingChanID: fwdPkg.Source, outgoingHTLCID: pd.ParentIndex, diff --git a/itest/list_on_test.go b/itest/list_on_test.go index 4696fc80ec7..2434ee92d05 100644 --- a/itest/list_on_test.go +++ b/itest/list_on_test.go @@ -566,6 +566,26 @@ var allTestCases = []*lntest.TestCase{ Name: "forward blinded", TestFunc: testForwardBlindedRoute, }, + { + Name: "receiver blinded error", + TestFunc: testReceiverBlindedError, + }, + { + Name: "relayer blinded error", + TestFunc: testRelayingBlindedError, + }, + { + Name: "introduction blinded error", + TestFunc: testIntroductionNodeError, + }, + { + Name: "disable introduction node", + TestFunc: testDisableIntroductionNode, + }, + { + Name: "on chain to blinded", + TestFunc: testErrorHandlingOnChainFailure, + }, { Name: "removetx", TestFunc: testRemoveTx, diff --git a/itest/lnd_route_blinding_test.go b/itest/lnd_route_blinding_test.go index e2d1ec033ed..1cae46a0cb3 100644 --- a/itest/lnd_route_blinding_test.go +++ b/itest/lnd_route_blinding_test.go @@ -355,14 +355,16 @@ func (b *blindedForwardTest) setup( ctx context.Context) *routing.BlindedPayment { b.carol = b.ht.NewNode("Carol", []string{ - "requireinterceptor", + "--requireinterceptor", "--bitcoin.timelockdelta=18", }) var err error b.carolInterceptor, err = b.carol.RPC.Router.HtlcInterceptor(ctx) require.NoError(b.ht, err, "interceptor") - b.dave = b.ht.NewNode("Dave", nil) + b.dave = b.ht.NewNode("Dave", []string{ + "--bitcoin.timelockdelta=18", + }) b.channels = setupFourHopNetwork(b.ht, b.carol, b.dave) @@ -448,9 +450,11 @@ func (b *blindedForwardTest) createRouteToBlinded(paymentAmt int64, return resp.Routes[0] } -// sendBlindedPayment dispatches a payment to the route provided. +// sendBlindedPayment dispatches a payment to the route provided, returning a +// cancel function for the payment. Timeout is set for very long to allow +// time for on-chain resolution. func (b *blindedForwardTest) sendBlindedPayment(ctx context.Context, - route *lnrpc.Route) { + route *lnrpc.Route) func() { hash := sha256.Sum256(b.preimage[:]) sendReq := &routerrpc.SendToRouteRequest{ @@ -458,11 +462,13 @@ func (b *blindedForwardTest) sendBlindedPayment(ctx context.Context, Route: route, } - // Dispatch in a goroutine because this call is blocking - we assume - // that we'll have assertions that this payment is sent by the caller. + ctx, cancel := context.WithTimeout(ctx, time.Hour) go func() { - b.ht.Alice.RPC.SendToRouteV2(sendReq) + _, err := b.ht.Alice.RPC.Router.SendToRouteV2(ctx, sendReq) + require.NoError(b.ht, err) }() + + return cancel } // interceptFinalHop launches a goroutine to intercept Carol's htlcs and @@ -524,6 +530,43 @@ func (b *blindedForwardTest) interceptFinalHop() func(routerrpc.ResolveHoldForwa return resolve } +// drainCarolLiquidity will drain all of the liquidity in Carol's channel in +// the direction requested: +// - incoming: Carol has no incoming liquidity from Bob +// - outgoing: Carol has no outgoing liquidity to Dave. +func (b *blindedForwardTest) drainCarolLiquidity(incoming bool) { + sendingNode := b.carol + receivingNode := b.dave + + if incoming { + sendingNode = b.ht.Bob + receivingNode = b.carol + } + + resp := sendingNode.RPC.ListChannels(&lnrpc.ListChannelsRequest{ + Peer: receivingNode.PubKey[:], + }) + require.Len(b.ht, resp.Channels, 1) + + // We can't send our channel reserve, and leave some buffer for fees. + paymentAmt := resp.Channels[0].LocalBalance - + int64(resp.Channels[0].RemoteConstraints.ChanReserveSat) - 25000 + + invoice := receivingNode.RPC.AddInvoice(&lnrpc.Invoice{ + // Leave some leeway for fees for the HTLC. + Value: paymentAmt, + }) + + pmtClient := sendingNode.RPC.SendPayment( + &routerrpc.SendPaymentRequest{ + PaymentRequest: invoice.PaymentRequest, + TimeoutSeconds: 60, + }, + ) + + b.ht.AssertPaymentStatusFromStream(pmtClient, lnrpc.Payment_SUCCEEDED) +} + // setupFourHopNetwork creates a network with the following topology and // liquidity: // Alice (100k)----- Bob (100k) ----- Carol (100k) ----- Dave @@ -768,7 +811,8 @@ func testForwardBlindedRoute(ht *lntest.HarnessTest) { resolveHTLC := testCase.interceptFinalHop() // Once our interceptor is set up, we can send the blinded payment. - testCase.sendBlindedPayment(ctx, blindedRoute) + cancelPmt := testCase.sendBlindedPayment(ctx, blindedRoute) + defer cancelPmt() // Wait for the HTLC to be active on Alice's channel. hash := sha256.Sum256(testCase.preimage[:]) @@ -788,3 +832,227 @@ func testForwardBlindedRoute(ht *lntest.HarnessTest) { ht.AssertHTLCNotActive(ht.Bob, testCase.channels[1], hash[:]) ht.AssertHTLCNotActive(ht.Alice, testCase.channels[0], hash[:]) } + +// Tests handling of errors from the receiving node in a blinded route, testing +// a payment over: Alice -- Bob -- Carol -- Dave, where Bob is the introduction +// node. +// +// Note that at present the payment fails at Dave because we do not yet support +// receiving to blinded routes. In future, we can substitute this test out to +// trigger an IncorrectPaymentDetails failure. In the meantime, this test +// provides valuable coverage for the case where a node in the route is not +// spec compliant (ie, does not return the blinded failure and just uses a +// normal one) because Dave will not appropriately convert the error. +func testReceiverBlindedError(ht *lntest.HarnessTest) { + ctx, testCase := newBlindedForwardTest(ht) + defer testCase.cleanup() + route := testCase.setup(ctx) + + sendAndResumeBlindedPayment(ctx, ht, testCase, route, true) +} + +// testRelayingBlindedError tests handling of errors from relaying nodes in a +// blinded route, testing a failure over on Carol's outgoing link in the +// following topology: Alice -- Bob -- Carol -- Dave, where Bob is the +// introduction node. +func testRelayingBlindedError(ht *lntest.HarnessTest) { + ctx, testCase := newBlindedForwardTest(ht) + defer testCase.cleanup() + route := testCase.setup(ctx) + + // Before we send our payment, drain all of Carol's liquidity + // so that she can't forward the payment to Dave. + testCase.drainCarolLiquidity(false) + + // Then dispatch the payment through Carol which will fail due to + // a lack of liquidity. This check only happens _after_ the interceptor + // has given the instruction to resume so we can use test + // infrastructure that will go ahead and intercept the payment. + sendAndResumeBlindedPayment(ctx, ht, testCase, route, true) +} + +// sendAndResumeBlindedPayment sends a blinded payment through the test +// network provided, intercepting the payment at Carol and allowing it to +// resume. This utility function allows us to ensure that payments at least +// reach Carol and asserts that all errors appear to originate from the +// introduction node. +func sendAndResumeBlindedPayment(ctx context.Context, ht *lntest.HarnessTest, + testCase *blindedForwardTest, route *routing.BlindedPayment, + interceptAtCarol bool) { + + blindedRoute := testCase.createRouteToBlinded(10_000_000, route) + + // Before we dispatch the payment, spin up a goroutine that will + // intercept the HTLC on Carol's forward. This allows us to ensure + // that the HTLC actually reaches the location we expect it to. + var resolveHTLC func(routerrpc.ResolveHoldForwardAction) + if interceptAtCarol { + resolveHTLC = testCase.interceptFinalHop() + } + + // First, test sending the payment all the way through to Dave. We + // expect this payment to fail, because he does not know how to + // process payments to a blinded route (not yet supported). + cancelPmt := testCase.sendBlindedPayment(ctx, blindedRoute) + defer cancelPmt() + + // When Carol intercepts the HTLC, instruct her to resume the payment + // so that it'll reach Dave and fail. + if interceptAtCarol { + resolveHTLC(routerrpc.ResolveHoldForwardAction_RESUME) + } + + // Wait for the HTLC to reflect as failed for Alice. + preimage, err := lntypes.MakePreimage(testCase.preimage[:]) + require.NoError(ht, err) + pmt := ht.AssertPaymentStatus(ht.Alice, preimage, lnrpc.Payment_FAILED) + require.Len(ht, pmt.Htlcs, 1) + require.EqualValues( + ht, 1, pmt.Htlcs[0].Failure.FailureSourceIndex, + ) + require.Equal( + ht, lnrpc.Failure_INVALID_ONION_BLINDING, + pmt.Htlcs[0].Failure.Code, + ) +} + +// testIntroductionNodeError tests handling of errors in a blinded route when +// the introduction node is the source of the error. This test sends a payment +// over Alice -- Bob -- Carol -- Dave, where Bob is the introduction node and +// has insufficient outgoing liquidity to forward on to carol. +func testIntroductionNodeError(ht *lntest.HarnessTest) { + ctx, testCase := newBlindedForwardTest(ht) + defer testCase.cleanup() + route := testCase.setup(ctx) + + // Before we send our payment, drain all of Carol's incoming liquidity + // so that she can't receive the forward from Bob, causing a failure + // at the introduction node. + testCase.drainCarolLiquidity(true) + + // Send the payment, but do not expect it to reach Carol at all. + sendAndResumeBlindedPayment(ctx, ht, testCase, route, false) +} + +// testDisableIntroductionNode tests disabling of blinded forwards for the +// introduction node. +func testDisableIntroductionNode(ht *lntest.HarnessTest) { + // Disable route blinding for Bob, then re-connect to Alice. + ht.RestartNodeWithExtraArgs(ht.Bob, []string{ + "--protocol.no-route-blinding", + }) + ht.EnsureConnected(ht.Alice, ht.Bob) + + ctx, testCase := newBlindedForwardTest(ht) + defer testCase.cleanup() + route := testCase.setup(ctx) + // We always expect failures to look like they originated at Bob + // because blinded errors are converted. However, our tests intercepts + // all of Carol's forwards and we're not providing it any interceptor + // instructions. This means that the test will hang/timeout at Carol + // if Bob _doesn't_ fail the HTLC back as expected. + sendAndResumeBlindedPayment(ctx, ht, testCase, route, false) +} + +// testErrorHandlingOnChainFailure tests handling of blinded errors when we're +// resolving from an on-chain resolution. This test also tests that we're able +// to resolve blinded HTLCs on chain between restarts, as we've got all the +// infrastructure in place already for error testing. +func testErrorHandlingOnChainFailure(ht *lntest.HarnessTest) { + // Setup a test case, note that we don't use its built in clean up + // because we're going to close a channel so we'll close out the + // rest manually. + ctx, testCase := newBlindedForwardTest(ht) + + // Note that we send a larger amount here do it'll be worthwhile for + // the sweeper to claim. + route := testCase.setup(ctx) + blindedRoute := testCase.createRouteToBlinded(50_000_000, route) + + // Once our interceptor is set up, we can send the blinded payment. + cancelPmt := testCase.sendBlindedPayment(ctx, blindedRoute) + defer cancelPmt() + + // Wait for the HTLC to be active on Alice and Bob's channels. + hash := sha256.Sum256(testCase.preimage[:]) + ht.AssertOutgoingHTLCActive(ht.Alice, testCase.channels[0], hash[:]) + ht.AssertOutgoingHTLCActive(ht.Bob, testCase.channels[1], hash[:]) + + // Intercept the forward on Carol's link, but do not take any action + // so that we have the chance to force close with this HTLC in flight. + carolHTLC, err := testCase.carolInterceptor.Recv() + require.NoError(ht, err) + + // Force close Bob <-> Carol. + closeStream, _ := ht.CloseChannelAssertPending( + ht.Bob, testCase.channels[1], true, + ) + + ht.AssertStreamChannelForceClosed( + ht.Bob, testCase.channels[1], false, closeStream, + ) + + // SuspendCarol so that she can't interfere with the resolution of the + // HTLC from now on. + restartCarol := ht.SuspendNode(testCase.carol) + + // Mine blocks so that Bob will claim his CSV delayed local commitment, + // we've already mined 1 block so we need one less than our CSV. + ht.MineBlocks(node.DefaultCSV - 1) + ht.AssertNumPendingSweeps(ht.Bob, 1) + ht.MineEmptyBlocks(1) + ht.Miner.MineBlocksAndAssertNumTxes(1, 1) + + // Restart bob so that we can test that he's able to recover everything + // he needs to claim a blinded HTLC. + ht.RestartNode(ht.Bob) + + // Mine enough blocks for Bob to trigger timeout of his outgoing HTLC. + // Carol's incoming expiry height is Bob's outgoing so we can use this + // value. + info := ht.Bob.RPC.GetInfo() + target := carolHTLC.IncomingExpiry - info.BlockHeight + ht.MineBlocks(target) + + // Wait for Bob's timeout transaction in the mempool, since we've + // suspended Carol we don't need to account for her commitment output + // claim. + ht.Miner.MineBlocksAndAssertNumTxes(1, 1) + + // Assert that the HTLC has cleared. + ht.AssertHTLCNotActive(ht.Alice, testCase.channels[0], hash[:]) + ht.AssertHTLCNotActive(ht.Bob, testCase.channels[0], hash[:]) + + // Wait for the HTLC to reflect as failed for Alice. + paymentStream := ht.Alice.RPC.TrackPaymentV2(hash[:]) + htlcs := ht.ReceiveTrackPayment(paymentStream).Htlcs + require.Len(ht, htlcs, 1) + require.NotNil(ht, htlcs[0].Failure) + require.Equal( + ht, htlcs[0].Failure.Code, + lnrpc.Failure_INVALID_ONION_BLINDING, + ) + + // Clean up the rest of our force close: mine blocks so that Bob's CSV + // expires plus one block to trigger his sweep and then mine it. + ht.MineBlocks(node.DefaultCSV + 1) + ht.Miner.MineBlocksAndAssertNumTxes(1, 1) + + // Bring carol back up so that we can close out the rest of our + // channels cooperatively. She requires an interceptor to start up + // so we just re-register our interceptor. + require.NoError(ht, restartCarol()) + _, err = testCase.carol.RPC.Router.HtlcInterceptor(ctx) + require.NoError(ht, err, "interceptor") + + // Assert that Carol has started up and reconnected to dave so that + // we can close out channels cooperatively. + ht.EnsureConnected(testCase.carol, testCase.dave) + + // Manually close out the rest of our channels and cancel (don't use + // built in cleanup which will try close the already-force-closed + // channel). + ht.CloseChannel(ht.Alice, testCase.channels[0]) + ht.CloseChannel(testCase.carol, testCase.channels[2]) + testCase.cancel() +} diff --git a/lncfg/protocol.go b/lncfg/protocol.go index 59027a09b75..e98b4dcf885 100644 --- a/lncfg/protocol.go +++ b/lncfg/protocol.go @@ -59,14 +59,6 @@ type ProtocolOptions struct { NoRouteBlindingOption bool `long:"no-route-blinding" description:"do not forward payments that are a part of a blinded route"` } -// DefaultProtocol returns a protocol config with route blinding turned off, -// temporarily in place until full handling of blinded route errors is merged. -func DefaultProtocol() *ProtocolOptions { - return &ProtocolOptions{ - NoRouteBlindingOption: true, - } -} - // Wumbo returns true if lnd should permit the creation and acceptance of wumbo // channels. func (l *ProtocolOptions) Wumbo() bool { diff --git a/lncfg/protocol_integration.go b/lncfg/protocol_integration.go index f44aa124693..841f8e9eb67 100644 --- a/lncfg/protocol_integration.go +++ b/lncfg/protocol_integration.go @@ -62,13 +62,6 @@ type ProtocolOptions struct { NoRouteBlindingOption bool `long:"no-route-blinding" description:"do not forward payments that are a part of a blinded route"` } -// DefaultProtocol returns a protocol config with route blinding turned on, -// so that itests can run against route blinding features even while we've -// got it turned off for the daemon (pending completion of error handling). -func DefaultProtocol() *ProtocolOptions { - return &ProtocolOptions{} -} - // Wumbo returns true if lnd should permit the creation and acceptance of wumbo // channels. func (l *ProtocolOptions) Wumbo() bool { diff --git a/lnrpc/lightning.pb.go b/lnrpc/lightning.pb.go index b2bc8034c70..161fd2f11f4 100644 --- a/lnrpc/lightning.pb.go +++ b/lnrpc/lightning.pb.go @@ -651,6 +651,8 @@ const ( FeatureBit_ANCHORS_OPT FeatureBit = 21 FeatureBit_ANCHORS_ZERO_FEE_HTLC_REQ FeatureBit = 22 FeatureBit_ANCHORS_ZERO_FEE_HTLC_OPT FeatureBit = 23 + FeatureBit_ROUTE_BLINDING_REQUIRED FeatureBit = 24 + FeatureBit_ROUTE_BLINDING_OPTIONAL FeatureBit = 25 FeatureBit_AMP_REQ FeatureBit = 30 FeatureBit_AMP_OPT FeatureBit = 31 ) @@ -681,6 +683,8 @@ var ( 21: "ANCHORS_OPT", 22: "ANCHORS_ZERO_FEE_HTLC_REQ", 23: "ANCHORS_ZERO_FEE_HTLC_OPT", + 24: "ROUTE_BLINDING_REQUIRED", + 25: "ROUTE_BLINDING_OPTIONAL", 30: "AMP_REQ", 31: "AMP_OPT", } @@ -708,6 +712,8 @@ var ( "ANCHORS_OPT": 21, "ANCHORS_ZERO_FEE_HTLC_REQ": 22, 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25; AMP_REQ = 30; AMP_OPT = 31; } diff --git a/lnrpc/lightning.swagger.json b/lnrpc/lightning.swagger.json index c0ea92d8219..3a7132fc0b5 100644 --- a/lnrpc/lightning.swagger.json +++ b/lnrpc/lightning.swagger.json @@ -1470,6 +1470,8 @@ "ANCHORS_OPT", "ANCHORS_ZERO_FEE_HTLC_REQ", "ANCHORS_ZERO_FEE_HTLC_OPT", + "ROUTE_BLINDING_REQUIRED", + "ROUTE_BLINDING_OPTIONAL", "AMP_REQ", "AMP_OPT" ] @@ -4694,6 +4696,8 @@ "ANCHORS_OPT", "ANCHORS_ZERO_FEE_HTLC_REQ", "ANCHORS_ZERO_FEE_HTLC_OPT", + "ROUTE_BLINDING_REQUIRED", + "ROUTE_BLINDING_OPTIONAL", "AMP_REQ", "AMP_OPT" ], diff --git a/lnrpc/peersrpc/peers.swagger.json b/lnrpc/peersrpc/peers.swagger.json index c7b9970cf6d..b667994a4f1 100644 --- a/lnrpc/peersrpc/peers.swagger.json +++ b/lnrpc/peersrpc/peers.swagger.json @@ -77,6 +77,8 @@ "ANCHORS_OPT", "ANCHORS_ZERO_FEE_HTLC_REQ", "ANCHORS_ZERO_FEE_HTLC_OPT", + "ROUTE_BLINDING_REQUIRED", + "ROUTE_BLINDING_OPTIONAL", "AMP_REQ", "AMP_OPT" ], diff --git a/lnrpc/routerrpc/router.swagger.json b/lnrpc/routerrpc/router.swagger.json index 8e1c646c131..1d948d3f89e 100644 --- a/lnrpc/routerrpc/router.swagger.json +++ b/lnrpc/routerrpc/router.swagger.json @@ -772,6 +772,8 @@ "ANCHORS_OPT", "ANCHORS_ZERO_FEE_HTLC_REQ", "ANCHORS_ZERO_FEE_HTLC_OPT", + "ROUTE_BLINDING_REQUIRED", + "ROUTE_BLINDING_OPTIONAL", "AMP_REQ", "AMP_OPT" ], diff --git a/lnwire/features.go b/lnwire/features.go index ab6facc75fd..e4dd7f4f81c 100644 --- a/lnwire/features.go +++ b/lnwire/features.go @@ -141,6 +141,14 @@ const ( // transactions, which also imply anchor commitments. AnchorsZeroFeeHtlcTxOptional FeatureBit = 23 + // RouteBlindingRequired is a required feature bit that signals that + // the node supports blinded payments. + RouteBlindingRequired FeatureBit = 24 + + // RouteBlindingOptional is an optional feature bit that signals that + // the node supports blinded payments. + RouteBlindingOptional FeatureBit = 25 + // ShutdownAnySegwitRequired is an required feature bit that signals // that the sender is able to properly handle/parse segwit witness // programs up to version 16. This enables utilization of Taproot @@ -315,6 +323,8 @@ var Features = map[FeatureBit]string{ ScidAliasOptional: "scid-alias", ZeroConfRequired: "zero-conf", ZeroConfOptional: "zero-conf", + RouteBlindingRequired: "route-blinding", + RouteBlindingOptional: "route-blinding", ShutdownAnySegwitRequired: "shutdown-any-segwit", ShutdownAnySegwitOptional: "shutdown-any-segwit", SimpleTaprootChannelsRequiredFinal: "simple-taproot-chans", diff --git a/server.go b/server.go index 2979880a291..43390ca574e 100644 --- a/server.go +++ b/server.go @@ -549,6 +549,7 @@ func newServer(cfg *Config, listenAddrs []net.Addr, NoAnySegwit: cfg.ProtocolOptions.NoAnySegwit(), CustomFeatures: cfg.ProtocolOptions.ExperimentalProtocol.CustomFeatures(), NoTaprootChans: !cfg.ProtocolOptions.TaprootChans, + NoRouteBlinding: cfg.ProtocolOptions.NoRouteBlinding(), }) if err != nil { return nil, err