From cc5e26b9c990bff120c2a6204ee495061029a3c6 Mon Sep 17 00:00:00 2001 From: Andras Banki-Horvath Date: Mon, 2 Jan 2023 19:37:15 +0100 Subject: [PATCH 1/5] proto: extend protocol with key reveal building blocks and new version This commit adds a new protocol version which will add MuSig2 loop in and loop out using key reveal and extends the existing protocol with new message members to be able to pass around htlc internal public keys. The commit also fixes some minor formatting issues in the server proto. --- loopdb/protocol_version.go | 6 + swapserverrpc/server.pb.go | 708 +++++++++++++++++++------------------ swapserverrpc/server.proto | 19 +- 3 files changed, 389 insertions(+), 344 deletions(-) diff --git a/loopdb/protocol_version.go b/loopdb/protocol_version.go index 06e0e32..2e95eca 100644 --- a/loopdb/protocol_version.go +++ b/loopdb/protocol_version.go @@ -55,6 +55,9 @@ const ( // HTLC v3 (P2TR) script for swaps. ProtocolVersionHtlcV3 = 10 + // ProtocolVersionMuSig2 will enable MuSig2 signature scheme for loops. + ProtocolVersionMuSig2 ProtocolVersion = 11 + // ProtocolVersionUnrecorded is set for swaps were created before we // started saving protocol version with swaps. ProtocolVersionUnrecorded ProtocolVersion = math.MaxUint32 @@ -141,6 +144,9 @@ func (p ProtocolVersion) String() string { case ProtocolVersionHtlcV3: return "HTLC V3" + case ProtocolVersionMuSig2: + return "MuSig2" + default: return "Unknown" } diff --git a/swapserverrpc/server.pb.go b/swapserverrpc/server.pb.go index 28d3f6e..b18b352 100644 --- a/swapserverrpc/server.pb.go +++ b/swapserverrpc/server.pb.go @@ -64,6 +64,8 @@ const ( ProtocolVersion_ROUTING_PLUGIN ProtocolVersion = 9 // The client will use the new v3 (taproot) HTLC scripts. ProtocolVersion_HTLC_V3 ProtocolVersion = 10 + // Enables MuSig2 signature scheme for swaps. + ProtocolVersion_MUSIG2 ProtocolVersion = 11 ) // Enum value maps for ProtocolVersion. @@ -80,6 +82,7 @@ var ( 8: "PROBE", 9: "ROUTING_PLUGIN", 10: "HTLC_V3", + 11: "MUSIG2", } ProtocolVersion_value = map[string]int32{ "LEGACY": 0, @@ -93,6 +96,7 @@ var ( "PROBE": 8, "ROUTING_PLUGIN": 9, "HTLC_V3": 10, + "MUSIG2": 11, } ) @@ -923,14 +927,16 @@ type ServerLoopInRequest struct { sizeCache protoimpl.SizeCache unknownFields protoimpl.UnknownFields - SenderKey []byte `protobuf:"bytes,1,opt,name=sender_key,json=senderKey,proto3" json:"sender_key,omitempty"` - SwapHash []byte `protobuf:"bytes,2,opt,name=swap_hash,json=swapHash,proto3" json:"swap_hash,omitempty"` - Amt uint64 `protobuf:"varint,3,opt,name=amt,proto3" json:"amt,omitempty"` - SwapInvoice string `protobuf:"bytes,4,opt,name=swap_invoice,json=swapInvoice,proto3" json:"swap_invoice,omitempty"` - LastHop []byte `protobuf:"bytes,5,opt,name=last_hop,json=lastHop,proto3" json:"last_hop,omitempty"` + SenderKey []byte `protobuf:"bytes,1,opt,name=sender_key,json=senderKey,proto3" json:"sender_key,omitempty"` + SenderInternalPubkey []byte `protobuf:"bytes,9,opt,name=sender_internal_pubkey,json=senderInternalPubkey,proto3" json:"sender_internal_pubkey,omitempty"` + SwapHash []byte `protobuf:"bytes,2,opt,name=swap_hash,json=swapHash,proto3" json:"swap_hash,omitempty"` + Amt uint64 `protobuf:"varint,3,opt,name=amt,proto3" json:"amt,omitempty"` + SwapInvoice string `protobuf:"bytes,4,opt,name=swap_invoice,json=swapInvoice,proto3" json:"swap_invoice,omitempty"` + LastHop []byte `protobuf:"bytes,5,opt,name=last_hop,json=lastHop,proto3" json:"last_hop,omitempty"` /// The protocol version that the client adheres to. ProtocolVersion ProtocolVersion `protobuf:"varint,6,opt,name=protocol_version,json=protocolVersion,proto3,enum=looprpc.ProtocolVersion" json:"protocol_version,omitempty"` - ProbeInvoice string `protobuf:"bytes,7,opt,name=probe_invoice,json=probeInvoice,proto3" json:"probe_invoice,omitempty"` + // An invoice that can be used for the purpose of probing. + ProbeInvoice string `protobuf:"bytes,7,opt,name=probe_invoice,json=probeInvoice,proto3" json:"probe_invoice,omitempty"` // The user agent string that identifies the software running on the user's // side. This can be changed in the user's client software but it _SHOULD_ // conform to the following pattern: @@ -980,6 +986,13 @@ func (x *ServerLoopInRequest) GetSenderKey() []byte { return nil } +func (x *ServerLoopInRequest) GetSenderInternalPubkey() []byte { + if x != nil { + return x.SenderInternalPubkey + } + return nil +} + func (x *ServerLoopInRequest) GetSwapHash() []byte { if x != nil { return x.SwapHash @@ -1034,8 +1047,9 @@ type ServerLoopInResponse struct { sizeCache protoimpl.SizeCache unknownFields protoimpl.UnknownFields - ReceiverKey []byte `protobuf:"bytes,1,opt,name=receiver_key,json=receiverKey,proto3" json:"receiver_key,omitempty"` - Expiry int32 `protobuf:"varint,2,opt,name=expiry,proto3" json:"expiry,omitempty"` + ReceiverKey []byte `protobuf:"bytes,1,opt,name=receiver_key,json=receiverKey,proto3" json:"receiver_key,omitempty"` + ReceiverInternalPubkey []byte `protobuf:"bytes,9,opt,name=receiver_internal_pubkey,json=receiverInternalPubkey,proto3" json:"receiver_internal_pubkey,omitempty"` + Expiry int32 `protobuf:"varint,2,opt,name=expiry,proto3" json:"expiry,omitempty"` // A human-readable message from the loop server. ServerMessage string `protobuf:"bytes,3,opt,name=server_message,json=serverMessage,proto3" json:"server_message,omitempty"` } @@ -1079,6 +1093,13 @@ func (x *ServerLoopInResponse) GetReceiverKey() []byte { return nil } +func (x *ServerLoopInResponse) GetReceiverInternalPubkey() []byte { + if x != nil { + return x.ReceiverInternalPubkey + } + return nil +} + func (x *ServerLoopInResponse) GetExpiry() int32 { if x != nil { return x.Expiry @@ -1891,7 +1912,7 @@ type ServerProbeRequest struct { sizeCache protoimpl.SizeCache unknownFields protoimpl.UnknownFields - /// The protocol version that the client adheres to. + // The protocol version that the client adheres to. ProtocolVersion ProtocolVersion `protobuf:"varint,1,opt,name=protocol_version,json=protocolVersion,proto3,enum=looprpc.ProtocolVersion" json:"protocol_version,omitempty"` // The probe amount. Amt uint64 `protobuf:"varint,2,opt,name=amt,proto3" json:"amt,omitempty"` @@ -1899,8 +1920,7 @@ type ServerProbeRequest struct { Target []byte `protobuf:"bytes,3,opt,name=target,proto3" json:"target,omitempty"` // Optional last hop to use when probing the client. LastHop []byte `protobuf:"bytes,4,opt,name=last_hop,json=lastHop,proto3" json:"last_hop,omitempty"` - // - //Optional route hints to reach the destination through private channels. + // Optional route hints to reach the destination through private channels. RouteHints []*RouteHint `protobuf:"bytes,5,rep,name=route_hints,json=routeHints,proto3" json:"route_hints,omitempty"` } @@ -2487,190 +2507,177 @@ var file_server_proto_rawDesc = []byte{ 0x74, 0x61, 0x18, 0x03, 0x20, 0x01, 0x28, 0x05, 0x52, 0x0c, 0x6d, 0x69, 0x6e, 0x43, 0x6c, 0x74, 0x76, 0x44, 0x65, 0x6c, 0x74, 0x61, 0x12, 0x24, 0x0a, 0x0e, 0x6d, 0x61, 0x78, 0x5f, 0x63, 0x6c, 0x74, 0x76, 0x5f, 0x64, 0x65, 0x6c, 0x74, 0x61, 0x18, 0x04, 0x20, 0x01, 0x28, 0x05, 0x52, 0x0c, - 0x6d, 0x61, 0x78, 0x43, 0x6c, 0x74, 0x76, 0x44, 0x65, 0x6c, 0x74, 0x61, 0x22, 0xaa, 0x02, 0x0a, + 0x6d, 0x61, 0x78, 0x43, 0x6c, 0x74, 0x76, 0x44, 0x65, 0x6c, 0x74, 0x61, 0x22, 0xe0, 0x02, 0x0a, 0x13, 0x53, 0x65, 0x72, 0x76, 0x65, 0x72, 0x4c, 0x6f, 0x6f, 0x70, 0x49, 0x6e, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x1d, 0x0a, 0x0a, 0x73, 0x65, 0x6e, 0x64, 0x65, 0x72, 0x5f, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x09, 0x73, 0x65, 0x6e, 0x64, 0x65, 0x72, - 0x4b, 0x65, 0x79, 0x12, 0x1b, 0x0a, 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0x73, 0x65, 0x72, 0x76, 0x65, 0x72, + 0x72, 0x70, 0x63, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33, } var ( diff --git a/swapserverrpc/server.proto b/swapserverrpc/server.proto index 3b5676a..54d8fec 100644 --- a/swapserverrpc/server.proto +++ b/swapserverrpc/server.proto @@ -97,6 +97,9 @@ enum ProtocolVersion { // The client will use the new v3 (taproot) HTLC scripts. HTLC_V3 = 10; + + // Enables MuSig2 signature scheme for swaps. + MUSIG2 = 11; } message ServerLoopOutRequest { @@ -196,14 +199,21 @@ message ServerLoopOutTerms { message ServerLoopInRequest { bytes sender_key = 1; + + bytes sender_internal_pubkey = 9; + bytes swap_hash = 2; + uint64 amt = 3; + string swap_invoice = 4; + bytes last_hop = 5; /// The protocol version that the client adheres to. ProtocolVersion protocol_version = 6; + // An invoice that can be used for the purpose of probing. string probe_invoice = 7; // The user agent string that identifies the software running on the user's @@ -218,6 +228,9 @@ message ServerLoopInRequest { message ServerLoopInResponse { bytes receiver_key = 1; + + bytes receiver_internal_pubkey = 9; + int32 expiry = 2; // A human-readable message from the loop server. @@ -458,7 +471,7 @@ message CancelLoopOutSwapResponse { } message ServerProbeRequest { - /// The protocol version that the client adheres to. + // The protocol version that the client adheres to. ProtocolVersion protocol_version = 1; // The probe amount. @@ -470,9 +483,7 @@ message ServerProbeRequest { // Optional last hop to use when probing the client. bytes last_hop = 4; - /* - Optional route hints to reach the destination through private channels. - */ + // Optional route hints to reach the destination through private channels. repeated RouteHint route_hints = 5; } From da4bcbea10fd646e1d04f0238a6fdbd873460117 Mon Sep 17 00:00:00 2001 From: Andras Banki-Horvath Date: Thu, 5 Jan 2023 18:16:05 +0100 Subject: [PATCH 2/5] loopdb: refactor the SwapContract to hold all HTLC keys This commit adds a new struct to hold all HTLC keys and refactors the SwapContract which is used by both loopin and loopout swaps to use this new struct. The newly added internal keys will for now hold the script keys to keep everything equivalent but are already stored and read back if the protocol version is set to MuSig2. --- client_test.go | 8 +- loopdb/loop.go | 39 ++++++--- loopdb/loopin.go | 8 +- loopdb/loopout.go | 8 +- loopdb/protocol_version.go | 2 +- loopdb/store.go | 172 ++++++++++++++++++++++++++++--------- loopdb/store_test.go | 48 ++++++++--- loopin.go | 29 ++++--- loopin_test.go | 24 ++++-- loopout.go | 36 ++++---- swap.go | 14 +-- 11 files changed, 273 insertions(+), 115 deletions(-) diff --git a/client_test.go b/client_test.go index 8539a88..ba3ff6e 100644 --- a/client_test.go +++ b/client_test.go @@ -240,8 +240,12 @@ func testLoopOutResume(t *testing.T, confs uint32, expired, preimageRevealed, Preimage: preimage, AmountRequested: amt, CltvExpiry: 744, - ReceiverKey: receiverKey, - SenderKey: senderKey, + HtlcKeys: loopdb.HtlcKeys{ + SenderScriptKey: senderKey, + SenderInternalPubKey: senderKey, + ReceiverScriptKey: receiverKey, + ReceiverInternalPubKey: receiverKey, + }, MaxSwapFee: 60000, MaxMinerFee: 50000, ProtocolVersion: protocolVersion, diff --git a/loopdb/loop.go b/loopdb/loop.go index e98745f..867476b 100644 --- a/loopdb/loop.go +++ b/loopdb/loop.go @@ -10,6 +10,31 @@ import ( "github.com/lightningnetwork/lnd/lntypes" ) +// HtlcKeys is a holder of all keys used when constructing the swap HTLC. Since +// it's used for both loop in and loop out swaps it may hold partial information +// about the sender or receiver depending on the swap type. +type HtlcKeys struct { + // SenderScriptKey is the sender's public key that is used in the HTLC, + // specifically when constructing the script spend scripts. + SenderScriptKey [33]byte + + // SenderInternalPubKey is the sender's internal pubkey that is used in + // taproot HTLCs as part of the aggregate internal key. + SenderInternalPubKey [33]byte + + // ReceiverScriptKey is the receiver's public key that is used in the + // HTLC, specifically when constructing the script spend scripts. + ReceiverScriptKey [33]byte + + // ReceiverInternalPubKey is the sender's internal pubkey that is used + // in taproot HTLCs as part of the aggregate internal key. + ReceiverInternalPubKey [33]byte + + // ClientScriptKeyLocator is the client's key locator for the key used + // in the HTLC script spend scripts. + ClientScriptKeyLocator keychain.KeyLocator +} + // SwapContract contains the base data that is serialized to persistent storage // for pending swaps. type SwapContract struct { @@ -19,18 +44,8 @@ type SwapContract struct { // AmountRequested is the total amount of the swap. AmountRequested btcutil.Amount - // SenderKey is the key of the sender that will be used in the on-chain - // HTLC. - SenderKey [33]byte - - // ReceiverKey is the of the receiver that will be used in the on-chain - // HTLC. - ReceiverKey [33]byte - - // ClientKeyLocator is the key locator (family and index) for the client - // key. It is for the receiver key if this is a loop out contract, or - // the sender key if this is a loop in contract. - ClientKeyLocator keychain.KeyLocator + // HtlcKeys holds all keys used in the swap HTLC construction. + HtlcKeys HtlcKeys // CltvExpiry is the total absolute CLTV expiry of the swap. CltvExpiry int32 diff --git a/loopdb/loopin.go b/loopdb/loopin.go index 7a665e2..e10e898 100644 --- a/loopdb/loopin.go +++ b/loopdb/loopin.go @@ -63,7 +63,7 @@ func serializeLoopInContract(swap *LoopInContract) ( return nil, err } - n, err := b.Write(swap.SenderKey[:]) + n, err := b.Write(swap.HtlcKeys.SenderScriptKey[:]) if err != nil { return nil, err } @@ -71,7 +71,7 @@ func serializeLoopInContract(swap *LoopInContract) ( return nil, fmt.Errorf("sender key has invalid length") } - n, err = b.Write(swap.ReceiverKey[:]) + n, err = b.Write(swap.HtlcKeys.ReceiverScriptKey[:]) if err != nil { return nil, err } @@ -161,7 +161,7 @@ func deserializeLoopInContract(value []byte) (*LoopInContract, error) { return nil, err } - n, err := r.Read(contract.SenderKey[:]) + n, err := r.Read(contract.HtlcKeys.SenderScriptKey[:]) if err != nil { return nil, err } @@ -169,7 +169,7 @@ func deserializeLoopInContract(value []byte) (*LoopInContract, error) { return nil, fmt.Errorf("sender key has invalid length") } - n, err = r.Read(contract.ReceiverKey[:]) + n, err = r.Read(contract.HtlcKeys.ReceiverScriptKey[:]) if err != nil { return nil, err } diff --git a/loopdb/loopout.go b/loopdb/loopout.go index ad628a9..9ebb858 100644 --- a/loopdb/loopout.go +++ b/loopdb/loopout.go @@ -134,7 +134,7 @@ func deserializeLoopOutContract(value []byte, chainParams *chaincfg.Params) ( return nil, err } - n, err := r.Read(contract.SenderKey[:]) + n, err := r.Read(contract.HtlcKeys.SenderScriptKey[:]) if err != nil { return nil, err } @@ -142,7 +142,7 @@ func deserializeLoopOutContract(value []byte, chainParams *chaincfg.Params) ( return nil, fmt.Errorf("sender key has invalid length") } - n, err = r.Read(contract.ReceiverKey[:]) + n, err = r.Read(contract.HtlcKeys.ReceiverScriptKey[:]) if err != nil { return nil, err } @@ -229,7 +229,7 @@ func serializeLoopOutContract(swap *LoopOutContract) ( return nil, err } - n, err := b.Write(swap.SenderKey[:]) + n, err := b.Write(swap.HtlcKeys.SenderScriptKey[:]) if err != nil { return nil, err } @@ -237,7 +237,7 @@ func serializeLoopOutContract(swap *LoopOutContract) ( return nil, fmt.Errorf("sender key has invalid length") } - n, err = b.Write(swap.ReceiverKey[:]) + n, err = b.Write(swap.HtlcKeys.ReceiverScriptKey[:]) if err != nil { return nil, err } diff --git a/loopdb/protocol_version.go b/loopdb/protocol_version.go index 2e95eca..a9fdee8 100644 --- a/loopdb/protocol_version.go +++ b/loopdb/protocol_version.go @@ -68,7 +68,7 @@ const ( // experimentalRPCProtocolVersion defines the RPC protocol version that // includes all currently experimentally released features. - experimentalRPCProtocolVersion = looprpc.ProtocolVersion_HTLC_V3 + experimentalRPCProtocolVersion = looprpc.ProtocolVersion_MUSIG2 ) var ( diff --git a/loopdb/store.go b/loopdb/store.go index b86008d..63b4be4 100644 --- a/loopdb/store.go +++ b/loopdb/store.go @@ -112,9 +112,30 @@ var ( // value: concatenation of uint32 values [family, index]. keyLocatorKey = []byte("keylocator") + // senderInternalPubKeyKey is the key that stores the sender's internal + // public key which used when constructing the swap HTLC. + // + // path: loopInBucket/loopOutBucket -> swapBucket[hash] + // -> senderInternalPubKeyKey + // value: serialized public key. + senderInternalPubKeyKey = []byte("sender-internal-pubkey") + + // receiverInternalPubKeyKey is the key that stores the receiver's + // internal public key which is used when constructing the swap HTLC. + // + // path: loopInBucket/loopOutBucket -> swapBucket[hash] + // -> receiverInternalPubKeyKey + // value: serialized public key. + receiverInternalPubKeyKey = []byte("receiver-internal-pubkey") + byteOrder = binary.BigEndian + // keyLength is the length of a serialized public key. keyLength = 33 + + // errInvalidKey is returned when a serialized key is not the expected + // length. + errInvalidKey = fmt.Errorf("invalid serialized key") ) const ( @@ -233,6 +254,95 @@ func NewBoltSwapStore(dbPath string, chainParams *chaincfg.Params) ( }, nil } +// marshalHtlcKeys marshals the HTLC keys of the swap contract into the swap +// bucket. +func marshalHtlcKeys(swapBucket *bbolt.Bucket, contract *SwapContract) error { + var err error + + // Store the key locator for swaps that use taproot HTLCs. + if contract.ProtocolVersion >= ProtocolVersionHtlcV3 { + keyLocator, err := MarshalKeyLocator( + contract.HtlcKeys.ClientScriptKeyLocator, + ) + if err != nil { + return err + } + + err = swapBucket.Put(keyLocatorKey, keyLocator) + if err != nil { + return err + } + } + + // Store the internal keys for MuSig2 swaps. + if contract.ProtocolVersion >= ProtocolVersionMuSig2 { + // Internal pubkeys are always filled. + err = swapBucket.Put( + senderInternalPubKeyKey, + contract.HtlcKeys.SenderInternalPubKey[:], + ) + if err != nil { + return err + } + + err = swapBucket.Put( + receiverInternalPubKeyKey, + contract.HtlcKeys.ReceiverInternalPubKey[:], + ) + if err != nil { + return err + } + } + + return nil +} + +// unmarshalHtlcKeys deserializes the htlc keys from the swap bucket. +func unmarshalHtlcKeys(swapBucket *bbolt.Bucket, contract *SwapContract) error { + var err error + + // HTLC V3 contracts have the client script key locator stored. + if contract.ProtocolVersion >= ProtocolVersionHtlcV3 && + ProtocolVersionUnrecorded > contract.ProtocolVersion { + + contract.HtlcKeys.ClientScriptKeyLocator, err = + UnmarshalKeyLocator( + swapBucket.Get(keyLocatorKey), + ) + if err != nil { + return err + } + + // Default the internal scriptkeys to the sender and receiver + // keys. + contract.HtlcKeys.SenderInternalPubKey = + contract.HtlcKeys.SenderScriptKey + contract.HtlcKeys.ReceiverInternalPubKey = + contract.HtlcKeys.ReceiverScriptKey + } + + // MuSig2 contracts have the internal keys stored too. + if contract.ProtocolVersion >= ProtocolVersionMuSig2 && + ProtocolVersionUnrecorded > contract.ProtocolVersion { + + // The pubkeys used for the joint HTLC internal key are always + // present. + key := swapBucket.Get(senderInternalPubKeyKey) + if len(key) != keyLength { + return errInvalidKey + } + copy(contract.HtlcKeys.SenderInternalPubKey[:], key) + + key = swapBucket.Get(receiverInternalPubKeyKey) + if len(key) != keyLength { + return errInvalidKey + } + copy(contract.HtlcKeys.ReceiverInternalPubKey[:], key) + } + + return nil +} + // FetchLoopOutSwaps returns all loop out swaps currently in the store. // // NOTE: Part of the loopdb.SwapStore interface. @@ -435,19 +545,10 @@ func (s *boltSwapStore) CreateLoopOut(hash lntypes.Hash, return err } - // Store the key locator for swaps with taproot htlc. - if swap.ProtocolVersion >= ProtocolVersionHtlcV3 { - keyLocator, err := MarshalKeyLocator( - swap.ClientKeyLocator, - ) - if err != nil { - return err - } - - err = swapBucket.Put(keyLocatorKey, keyLocator) - if err != nil { - return err - } + // Store the htlc keys and server key locator. + err = marshalHtlcKeys(swapBucket, &swap.SwapContract) + if err != nil { + return err } // Finally, we'll create an empty updates bucket for this swap @@ -501,19 +602,10 @@ func (s *boltSwapStore) CreateLoopIn(hash lntypes.Hash, return err } - // Store the key locator for swaps with taproot htlc. - if swap.ProtocolVersion >= ProtocolVersionHtlcV3 { - keyLocator, err := MarshalKeyLocator( - swap.ClientKeyLocator, - ) - if err != nil { - return err - } - - err = swapBucket.Put(keyLocatorKey, keyLocator) - if err != nil { - return err - } + // Store the htlc keys and server key locator. + err = marshalHtlcKeys(swapBucket, &swap.SwapContract) + if err != nil { + return err } // Finally, we'll create an empty updates bucket for this swap @@ -788,14 +880,12 @@ func (s *boltSwapStore) fetchLoopOutSwap(rootBucket *bbolt.Bucket, return nil, err } - // Try to unmarshal the key locator. - if contract.ProtocolVersion >= ProtocolVersionHtlcV3 { - contract.ClientKeyLocator, err = UnmarshalKeyLocator( - swapBucket.Get(keyLocatorKey), - ) - if err != nil { - return nil, err - } + // Unmarshal HTLC keys if the contract is recent. + err = unmarshalHtlcKeys( + swapBucket, &contract.SwapContract, + ) + if err != nil { + return nil, err } loop := LoopOut{ @@ -865,14 +955,12 @@ func (s *boltSwapStore) fetchLoopInSwap(rootBucket *bbolt.Bucket, return nil, err } - // Try to unmarshal the key locator. - if contract.ProtocolVersion >= ProtocolVersionHtlcV3 { - contract.ClientKeyLocator, err = UnmarshalKeyLocator( - swapBucket.Get(keyLocatorKey), - ) - if err != nil { - return nil, err - } + // Unmarshal HTLC keys if the contract is recent. + err = unmarshalHtlcKeys( + swapBucket, &contract.SwapContract, + ) + if err != nil { + return nil, err } loop := LoopIn{ diff --git a/loopdb/store_test.go b/loopdb/store_test.go index 8d2602c..324e965 100644 --- a/loopdb/store_test.go +++ b/loopdb/store_test.go @@ -12,6 +12,7 @@ import ( "github.com/btcsuite/btcd/chaincfg/chainhash" "github.com/coreos/bbolt" "github.com/lightninglabs/loop/test" + "github.com/lightningnetwork/lnd/keychain" "github.com/lightningnetwork/lnd/lntypes" "github.com/lightningnetwork/lnd/routing/route" "github.com/stretchr/testify/require" @@ -28,6 +29,16 @@ var ( 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, } + senderInternalKey = [33]byte{ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, + } + + receiverInternalKey = [33]byte{ + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, + } + testPreimage = lntypes.Preimage([32]byte{ 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, @@ -51,9 +62,16 @@ func TestLoopOutStore(t *testing.T) { AmountRequested: 100, Preimage: testPreimage, CltvExpiry: 144, - SenderKey: senderKey, - - ReceiverKey: receiverKey, + HtlcKeys: HtlcKeys{ + SenderScriptKey: senderKey, + ReceiverScriptKey: receiverKey, + SenderInternalPubKey: senderInternalKey, + ReceiverInternalPubKey: receiverInternalKey, + ClientScriptKeyLocator: keychain.KeyLocator{ + Family: 1, + Index: 2, + }, + }, MaxMinerFee: 10, MaxSwapFee: 20, @@ -61,7 +79,8 @@ func TestLoopOutStore(t *testing.T) { // Convert to/from unix to remove timezone, so that it // doesn't interfere with DeepEqual. - InitiationTime: time.Unix(0, initiationTime.UnixNano()), + InitiationTime: time.Unix(0, initiationTime.UnixNano()), + ProtocolVersion: ProtocolVersionMuSig2, }, MaxPrepayRoutingFee: 40, PrepayInvoice: "prepayinvoice", @@ -195,18 +214,27 @@ func TestLoopInStore(t *testing.T) { pendingSwap := LoopInContract{ SwapContract: SwapContract{ - AmountRequested: 100, - Preimage: testPreimage, - CltvExpiry: 144, - SenderKey: senderKey, - ReceiverKey: receiverKey, + AmountRequested: 100, + Preimage: testPreimage, + CltvExpiry: 144, + HtlcKeys: HtlcKeys{ + SenderScriptKey: senderKey, + ReceiverScriptKey: receiverKey, + SenderInternalPubKey: senderInternalKey, + ReceiverInternalPubKey: receiverInternalKey, + ClientScriptKeyLocator: keychain.KeyLocator{ + Family: 1, + Index: 2, + }, + }, MaxMinerFee: 10, MaxSwapFee: 20, InitiationHeight: 99, // Convert to/from unix to remove timezone, so that it // doesn't interfere with DeepEqual. - InitiationTime: time.Unix(0, initiationTime.UnixNano()), + InitiationTime: time.Unix(0, initiationTime.UnixNano()), + ProtocolVersion: ProtocolVersionMuSig2, }, HtlcConfTarget: 2, LastHop: &lastHop, diff --git a/loopin.go b/loopin.go index ae0c697..c329725 100644 --- a/loopin.go +++ b/loopin.go @@ -237,16 +237,20 @@ func newLoopInSwap(globalCtx context.Context, cfg *swapConfig, SwapContract: loopdb.SwapContract{ InitiationHeight: currentHeight, InitiationTime: initiationTime, - ReceiverKey: swapResp.receiverKey, - SenderKey: senderKey, - ClientKeyLocator: keyDesc.KeyLocator, - Preimage: swapPreimage, - AmountRequested: request.Amount, - CltvExpiry: swapResp.expiry, - MaxMinerFee: request.MaxMinerFee, - MaxSwapFee: request.MaxSwapFee, - Label: request.Label, - ProtocolVersion: loopdb.CurrentProtocolVersion(), + HtlcKeys: loopdb.HtlcKeys{ + SenderScriptKey: senderKey, + SenderInternalPubKey: senderKey, + ReceiverScriptKey: swapResp.receiverKey, + ReceiverInternalPubKey: swapResp.receiverKey, + ClientScriptKeyLocator: keyDesc.KeyLocator, + }, + Preimage: swapPreimage, + AmountRequested: request.Amount, + CltvExpiry: swapResp.expiry, + MaxMinerFee: request.MaxMinerFee, + MaxSwapFee: request.MaxSwapFee, + Label: request.Label, + ProtocolVersion: loopdb.CurrentProtocolVersion(), }, } @@ -975,8 +979,9 @@ func (s *loopInSwap) publishTimeoutTx(ctx context.Context, sequence := uint32(0) timeoutTx, err := s.sweeper.CreateSweepTx( - ctx, s.height, sequence, s.htlc, *htlcOutpoint, s.SenderKey, - redeemScript, witnessFunc, htlcValue, fee, s.timeoutAddr, + ctx, s.height, sequence, s.htlc, *htlcOutpoint, + s.HtlcKeys.SenderScriptKey, redeemScript, witnessFunc, + htlcValue, fee, s.timeoutAddr, ) if err != nil { return 0, err diff --git a/loopin_test.go b/loopin_test.go index 7bf3b8f..ca3b707 100644 --- a/loopin_test.go +++ b/loopin_test.go @@ -343,6 +343,7 @@ func TestLoopInResume(t *testing.T) { loopdb.ProtocolVersionUnrecorded, loopdb.ProtocolVersionHtlcV2, loopdb.ProtocolVersionHtlcV3, + loopdb.ProtocolVersionMuSig2, } testCases := []struct { @@ -414,8 +415,12 @@ func testLoopInResume(t *testing.T, state loopdb.SwapState, expired bool, Preimage: testPreimage, AmountRequested: 100000, CltvExpiry: 744, - ReceiverKey: receiverKey, - SenderKey: senderKey, + HtlcKeys: loopdb.HtlcKeys{ + SenderScriptKey: senderKey, + SenderInternalPubKey: senderKey, + ReceiverScriptKey: receiverKey, + ReceiverInternalPubKey: receiverKey, + }, MaxSwapFee: 60000, MaxMinerFee: 50000, ProtocolVersion: storedVersion, @@ -453,17 +458,22 @@ func testLoopInResume(t *testing.T, state loopdb.SwapState, expired bool, switch GetHtlcScriptVersion(storedVersion) { case swap.HtlcV2: htlc, err = swap.NewHtlcV2( - contract.CltvExpiry, contract.SenderKey, - contract.ReceiverKey, testPreimage.Hash(), + contract.CltvExpiry, + contract.HtlcKeys.SenderScriptKey, + contract.HtlcKeys.ReceiverScriptKey, + testPreimage.Hash(), cfg.lnd.ChainParams, ) case swap.HtlcV3: htlc, err = swap.NewHtlcV3( input.MuSig2Version040, - contract.CltvExpiry, contract.SenderKey, - contract.ReceiverKey, contract.SenderKey, - contract.ReceiverKey, testPreimage.Hash(), + contract.CltvExpiry, + contract.HtlcKeys.SenderInternalPubKey, + contract.HtlcKeys.ReceiverInternalPubKey, + contract.HtlcKeys.SenderScriptKey, + contract.HtlcKeys.ReceiverScriptKey, + testPreimage.Hash(), cfg.lnd.ChainParams, ) diff --git a/loopout.go b/loopout.go index 00654fe..ff9bd92 100644 --- a/loopout.go +++ b/loopout.go @@ -181,16 +181,20 @@ func newLoopOutSwap(globalCtx context.Context, cfg *swapConfig, SwapContract: loopdb.SwapContract{ InitiationHeight: currentHeight, InitiationTime: initiationTime, - SenderKey: swapResp.senderKey, - ReceiverKey: receiverKey, - ClientKeyLocator: keyDesc.KeyLocator, - Preimage: swapPreimage, - AmountRequested: request.Amount, - CltvExpiry: request.Expiry, - MaxMinerFee: request.MaxMinerFee, - MaxSwapFee: request.MaxSwapFee, - Label: request.Label, - ProtocolVersion: loopdb.CurrentProtocolVersion(), + HtlcKeys: loopdb.HtlcKeys{ + SenderScriptKey: swapResp.senderKey, + SenderInternalPubKey: swapResp.senderKey, + ReceiverScriptKey: receiverKey, + ReceiverInternalPubKey: receiverKey, + ClientScriptKeyLocator: keyDesc.KeyLocator, + }, + Preimage: swapPreimage, + AmountRequested: request.Amount, + CltvExpiry: request.Expiry, + MaxMinerFee: request.MaxMinerFee, + MaxSwapFee: request.MaxSwapFee, + Label: request.Label, + ProtocolVersion: loopdb.CurrentProtocolVersion(), }, OutgoingChanSet: chanSet, } @@ -1352,7 +1356,8 @@ func (s *loopOutSwap) createMuSig2SweepTxn( } signers := [][]byte{ - s.SenderKey[1:], s.ReceiverKey[1:], + s.HtlcKeys.SenderInternalPubKey[1:], + s.HtlcKeys.ReceiverInternalPubKey[1:], } htlc, ok := s.htlc.HtlcScript.(*swap.HtlcScriptV3) @@ -1363,8 +1368,9 @@ func (s *loopOutSwap) createMuSig2SweepTxn( // Now we're creating a local MuSig2 session using the receiver key's // key locator and the htlc's root hash. musig2SessionInfo, err := s.lnd.Signer.MuSig2CreateSession( - ctx, input.MuSig2Version040, &s.ClientKeyLocator, - signers, lndclient.MuSig2TaprootTweakOpt(htlc.RootHash[:], false), + ctx, input.MuSig2Version040, + &s.HtlcKeys.ClientScriptKeyLocator, signers, + lndclient.MuSig2TaprootTweakOpt(htlc.RootHash[:], false), ) if err != nil { return nil, err @@ -1609,8 +1615,8 @@ func (s *loopOutSwap) sweep(ctx context.Context, htlcOutpoint wire.OutPoint, // Create sweep tx. sweepTx, err := s.sweeper.CreateSweepTx( ctx, s.height, s.htlc.SuccessSequence(), s.htlc, - htlcOutpoint, s.ReceiverKey, redeemScript, witnessFunc, - htlcValue, fee, s.DestAddr, + htlcOutpoint, s.contract.HtlcKeys.ReceiverScriptKey, + redeemScript, witnessFunc, htlcValue, fee, s.DestAddr, ) if err != nil { return err diff --git a/swap.go b/swap.go index 6e2d947..caa5d21 100644 --- a/swap.go +++ b/swap.go @@ -76,18 +76,20 @@ func GetHtlc(hash lntypes.Hash, contract *loopdb.SwapContract, switch GetHtlcScriptVersion(contract.ProtocolVersion) { case swap.HtlcV2: return swap.NewHtlcV2( - contract.CltvExpiry, contract.SenderKey, - contract.ReceiverKey, hash, + contract.CltvExpiry, contract.HtlcKeys.SenderScriptKey, + contract.HtlcKeys.ReceiverScriptKey, hash, chainParams, ) case swap.HtlcV3: return swap.NewHtlcV3( input.MuSig2Version040, - contract.CltvExpiry, contract.SenderKey, - contract.ReceiverKey, contract.SenderKey, - contract.ReceiverKey, hash, - chainParams, + contract.CltvExpiry, + contract.HtlcKeys.SenderInternalPubKey, + contract.HtlcKeys.ReceiverInternalPubKey, + contract.HtlcKeys.SenderScriptKey, + contract.HtlcKeys.ReceiverScriptKey, + hash, chainParams, ) } From 90ae922adf7996165f6d6a1086476c9185badfc6 Mon Sep 17 00:00:00 2001 From: Andras Banki-Horvath Date: Fri, 6 Jan 2023 17:16:17 +0100 Subject: [PATCH 3/5] loopin: generate and send internal key for MuSig2 swaps This commit changes how we create loopin swaps if the client activates the experimental MuSig2 features. When creating a new loopin swap the client will create (and store) a new key that will be used as the sender's internal key when constructing the HTLC. The client will send the public part to the server and will also receive (and store) the server's (receiver) internal public key. --- loopin.go | 45 +++++++++++++++++++++++++++++++++++++++++-- server_mock_test.go | 14 ++++++++++---- swap_server_client.go | 38 +++++++++++++++++++++--------------- 3 files changed, 76 insertions(+), 21 deletions(-) diff --git a/loopin.go b/loopin.go index c329725..3bdff19 100644 --- a/loopin.go +++ b/loopin.go @@ -9,6 +9,7 @@ import ( "sync" "time" + "github.com/btcsuite/btcd/btcec/v2" "github.com/btcsuite/btcd/btcutil" "github.com/btcsuite/btcd/chaincfg/chainhash" "github.com/btcsuite/btcd/mempool" @@ -19,6 +20,7 @@ import ( "github.com/lightninglabs/loop/swap" "github.com/lightningnetwork/lnd/chainntnfs" invpkg "github.com/lightningnetwork/lnd/invoices" + "github.com/lightningnetwork/lnd/keychain" "github.com/lightningnetwork/lnd/lnrpc/invoicesrpc" "github.com/lightningnetwork/lnd/lnrpc/walletrpc" "github.com/lightningnetwork/lnd/lntypes" @@ -189,6 +191,23 @@ func newLoopInSwap(globalCtx context.Context, cfg *swapConfig, return nil, err } + // Default the HTLC internal key to our sender key. + senderInternalPubKey := senderKey + + // If this is a MuSig2 swap then we'll generate a brand new key pair + // and will use that as the internal key for the HTLC. + if loopdb.CurrentProtocolVersion() >= loopdb.ProtocolVersionMuSig2 { + secret, err := sharedSecretFromHash( + globalCtx, cfg.lnd.Signer, swapHash, + ) + if err != nil { + return nil, err + } + + _, pubKey := btcec.PrivKeyFromBytes(secret[:]) + copy(senderInternalPubKey[:], pubKey.SerializeCompressed()) + } + // Create a cancellable context that is used for monitoring the probe. probeWaitCtx, probeWaitCancel := context.WithCancel(globalCtx) @@ -204,8 +223,8 @@ func newLoopInSwap(globalCtx context.Context, cfg *swapConfig, // htlc. log.Infof("Initiating swap request at height %v", currentHeight) swapResp, err := cfg.server.NewLoopInSwap(globalCtx, swapHash, - request.Amount, senderKey, swapInvoice, probeInvoice, - request.LastHop, request.Initiator, + request.Amount, senderKey, senderInternalPubKey, swapInvoice, + probeInvoice, request.LastHop, request.Initiator, ) probeWaitCancel() if err != nil { @@ -254,6 +273,13 @@ func newLoopInSwap(globalCtx context.Context, cfg *swapConfig, }, } + // For MuSig2 swaps we store the proper internal keys that we generated + // and received from the server. + if loopdb.CurrentProtocolVersion() >= loopdb.ProtocolVersionMuSig2 { + contract.HtlcKeys.SenderInternalPubKey = senderInternalPubKey + contract.HtlcKeys.ReceiverInternalPubKey = swapResp.receiverInternalKey + } + swapKit := newSwapKit( swapHash, swap.TypeIn, cfg, &contract.SwapContract, @@ -1031,3 +1057,18 @@ func (s *loopInSwap) setState(state loopdb.SwapState) { s.lastUpdateTime = time.Now() s.state = state } + +// sharedSecretFromHash derives the shared secret from the swap hash using the +// swap.KeyFamily family and zero as index. +func sharedSecretFromHash(ctx context.Context, signer lndclient.SignerClient, + hash lntypes.Hash) ([32]byte, error) { + + _, hashPubKey := btcec.PrivKeyFromBytes(hash[:]) + + return signer.DeriveSharedKey( + ctx, hashPubKey, &keychain.KeyLocator{ + Family: keychain.KeyFamily(swap.KeyFamily), + Index: 0, + }, + ) +} diff --git a/server_mock_test.go b/server_mock_test.go index 28c42fe..9851a39 100644 --- a/server_mock_test.go +++ b/server_mock_test.go @@ -151,17 +151,22 @@ func getInvoice(hash lntypes.Hash, amt btcutil.Amount, memo string) (string, err } func (s *serverMock) NewLoopInSwap(_ context.Context, swapHash lntypes.Hash, - amount btcutil.Amount, _ [33]byte, swapInvoice, _ string, + amount btcutil.Amount, _, _ [33]byte, swapInvoice, _ string, _ *route.Vertex, _ string) (*newLoopInResponse, error) { _, receiverKey := test.CreateKey(101) + _, receiverInternalKey := test.CreateKey(102) if amount != s.expectedSwapAmt { return nil, errors.New("unexpected test swap amount") } - var receiverKeyArray [33]byte + var receiverKeyArray, receiverInternalKeyArray [33]byte copy(receiverKeyArray[:], receiverKey.SerializeCompressed()) + copy( + receiverInternalKeyArray[:], + receiverInternalKey.SerializeCompressed(), + ) s.swapInvoice = swapInvoice s.swapHash = swapHash @@ -175,8 +180,9 @@ func (s *serverMock) NewLoopInSwap(_ context.Context, swapHash lntypes.Hash, <-s.lnd.FailInvoiceChannel resp := &newLoopInResponse{ - expiry: s.height + testChargeOnChainCltvDelta, - receiverKey: receiverKeyArray, + expiry: s.height + testChargeOnChainCltvDelta, + receiverKey: receiverKeyArray, + receiverInternalKey: receiverInternalKeyArray, } return resp, nil diff --git a/swap_server_client.go b/swap_server_client.go index b2d23c5..e029943 100644 --- a/swap_server_client.go +++ b/swap_server_client.go @@ -94,10 +94,10 @@ type swapServerClient interface { preimage lntypes.Preimage) error NewLoopInSwap(ctx context.Context, - swapHash lntypes.Hash, amount btcutil.Amount, - senderKey [33]byte, swapInvoice, probeInvoice string, - lastHop *route.Vertex, initiator string) (*newLoopInResponse, - error) + swapHash lntypes.Hash, amount btcutil.Amount, senderScriptKey, + senderInternalKey [33]byte, swapInvoice, probeInvoice string, + lastHop *route.Vertex, initiator string) ( + *newLoopInResponse, error) // SubscribeLoopOutUpdates subscribes to loop out server state. SubscribeLoopOutUpdates(ctx context.Context, @@ -419,9 +419,9 @@ func (s *grpcSwapServerClient) PushLoopOutPreimage(ctx context.Context, } func (s *grpcSwapServerClient) NewLoopInSwap(ctx context.Context, - swapHash lntypes.Hash, amount btcutil.Amount, senderKey [33]byte, - swapInvoice, probeInvoice string, lastHop *route.Vertex, - initiator string) (*newLoopInResponse, error) { + swapHash lntypes.Hash, amount btcutil.Amount, senderScriptKey, + senderInternalKey [33]byte, swapInvoice, probeInvoice string, + lastHop *route.Vertex, initiator string) (*newLoopInResponse, error) { rpcCtx, rpcCancel := context.WithTimeout(ctx, globalCallTimeout) defer rpcCancel() @@ -429,7 +429,7 @@ func (s *grpcSwapServerClient) NewLoopInSwap(ctx context.Context, req := &looprpc.ServerLoopInRequest{ SwapHash: swapHash[:], Amt: uint64(amount), - SenderKey: senderKey[:], + SenderKey: senderScriptKey[:], SwapInvoice: swapInvoice, ProtocolVersion: loopdb.CurrentRPCProtocolVersion(), ProbeInvoice: probeInvoice, @@ -439,13 +439,19 @@ func (s *grpcSwapServerClient) NewLoopInSwap(ctx context.Context, req.LastHop = lastHop[:] } + // Set the client's internal key if this is a MuSig2 swap. + if loopdb.CurrentProtocolVersion() >= loopdb.ProtocolVersionMuSig2 { + req.SenderInternalPubkey = senderInternalKey[:] + } + swapResp, err := s.server.NewLoopInSwap(rpcCtx, req) if err != nil { return nil, err } - var receiverKey [33]byte + var receiverKey, receiverInternalKey [33]byte copy(receiverKey[:], swapResp.ReceiverKey) + copy(receiverInternalKey[:], swapResp.ReceiverInternalPubkey) // Validate receiver key. _, err = btcec.ParsePubKey(receiverKey[:]) @@ -454,9 +460,10 @@ func (s *grpcSwapServerClient) NewLoopInSwap(ctx context.Context, } return &newLoopInResponse{ - receiverKey: receiverKey, - expiry: swapResp.Expiry, - serverMessage: swapResp.ServerMessage, + receiverKey: receiverKey, + receiverInternalKey: receiverInternalKey, + expiry: swapResp.Expiry, + serverMessage: swapResp.ServerMessage, }, nil } @@ -873,7 +880,8 @@ type newLoopOutResponse struct { } type newLoopInResponse struct { - receiverKey [33]byte - expiry int32 - serverMessage string + receiverKey [33]byte + receiverInternalKey [33]byte + expiry int32 + serverMessage string } From b47f67a6de938935ee30c221477f17fc7f843113 Mon Sep 17 00:00:00 2001 From: Andras Banki-Horvath Date: Fri, 6 Jan 2023 18:02:29 +0100 Subject: [PATCH 4/5] loopin: push the htlc internal key if the invoice is swept This commit adds key reveal to MuSig2 loopin swaps' success path. In this case the client reveals their internal HTLC key to the server when the swap invoice is settled. With this key the server can sweep the swap HTLC without any more interaction from the client. We'll do this every block (after the invoice has been settled). --- loopin.go | 36 +++ server_mock_test.go | 6 + swap_server_client.go | 25 ++ swapserverrpc/server.pb.go | 529 ++++++++++++++++++++------------ swapserverrpc/server.proto | 16 + swapserverrpc/server_grpc.pb.go | 36 +++ 6 files changed, 458 insertions(+), 190 deletions(-) diff --git a/loopin.go b/loopin.go index 3bdff19..d755122 100644 --- a/loopin.go +++ b/loopin.go @@ -839,6 +839,7 @@ func (s *loopInSwap) waitForSwapComplete(ctx context.Context, htlcSpend := false invoiceFinalized := false + htlcKeyRevealed := false for !htlcSpend || !invoiceFinalized { select { // Spend notification error. @@ -855,6 +856,10 @@ func (s *loopInSwap) waitForSwapComplete(ctx context.Context, return err } + if invoiceFinalized && !htlcKeyRevealed { + htlcKeyRevealed = s.tryPushHtlcKey(ctx) + } + // The htlc spend is confirmed. Inspect the spending tx to // determine the final swap state. case spendDetails := <-spendChan: @@ -918,6 +923,7 @@ func (s *loopInSwap) waitForSwapComplete(ctx context.Context, } invoiceFinalized = true + htlcKeyRevealed = s.tryPushHtlcKey(ctx) // Canceled invoice has no effect on server cost // balance. @@ -933,6 +939,36 @@ func (s *loopInSwap) waitForSwapComplete(ctx context.Context, return nil } +// tryPushHtlcKey attempts to push the htlc key to the server. If the server +// returns an error of any kind we'll log it as a warning but won't act as +// the swap execution can just go on without the server gaining knowledge of +// our internal key. +func (s *loopInSwap) tryPushHtlcKey(ctx context.Context) bool { + if s.ProtocolVersion < loopdb.ProtocolVersionMuSig2 { + return false + } + + log.Infof("Attempting to reveal internal HTLC key to the server") + + internalPrivKey, err := sharedSecretFromHash( + ctx, s.swapConfig.lnd.Signer, s.hash, + ) + if err != nil { + s.log.Warnf("Unable to derive HTLC internal private key: %v", + err) + + return false + } + + err = s.server.PushKey(ctx, s.ProtocolVersion, s.hash, internalPrivKey) + if err != nil { + s.log.Warnf("Internal HTLC key reveal failed: %v", err) + return false + } + + return true +} + func (s *loopInSwap) processHtlcSpend(ctx context.Context, spend *chainntnfs.SpendDetail, htlcValue, sweepFee btcutil.Amount) error { diff --git a/server_mock_test.go b/server_mock_test.go index 9851a39..82f3c30 100644 --- a/server_mock_test.go +++ b/server_mock_test.go @@ -267,3 +267,9 @@ func (s *serverMock) MuSig2SignSweep(_ context.Context, _ loopdb.ProtocolVersion return nil, nil, nil } + +func (s *serverMock) PushKey(_ context.Context, _ loopdb.ProtocolVersion, + _ lntypes.Hash, _ [32]byte) error { + + return nil +} diff --git a/swap_server_client.go b/swap_server_client.go index e029943..1a752a5 100644 --- a/swap_server_client.go +++ b/swap_server_client.go @@ -128,6 +128,12 @@ type swapServerClient interface { protocolVersion loopdb.ProtocolVersion, swapHash lntypes.Hash, paymentAddr [32]byte, nonce []byte, sweepTxPsbt []byte) ( []byte, []byte, error) + + // PushKey sends the client's HTLC internal key associated with the + // swap to the server. + PushKey(ctx context.Context, + protocolVersion loopdb.ProtocolVersion, swapHash lntypes.Hash, + clientInternalPrivateKey [32]byte) error } type grpcSwapServerClient struct { @@ -760,6 +766,25 @@ func (s *grpcSwapServerClient) MuSig2SignSweep(ctx context.Context, return res.Nonce, res.PartialSignature, nil } +// PushKey sends the client's HTLC internal key associated with the swap to +// the server. +func (s *grpcSwapServerClient) PushKey(ctx context.Context, + protocolVersion loopdb.ProtocolVersion, swapHash lntypes.Hash, + clientInternalPrivateKey [32]byte) error { + + req := &looprpc.ServerPushKeyReq{ + ProtocolVersion: looprpc.ProtocolVersion(protocolVersion), + SwapHash: swapHash[:], + InternalPrivkey: clientInternalPrivateKey[:], + } + + rpcCtx, rpcCancel := context.WithTimeout(ctx, globalCallTimeout) + defer rpcCancel() + + _, err := s.server.PushKey(rpcCtx, req) + return err +} + func rpcRouteCancel(details *outCancelDetails) ( *looprpc.CancelLoopOutSwapRequest_RouteCancel, error) { diff --git a/swapserverrpc/server.pb.go b/swapserverrpc/server.pb.go index b18b352..cf553b8 100644 --- a/swapserverrpc/server.pb.go +++ b/swapserverrpc/server.pb.go @@ -2424,6 +2424,110 @@ func (x *MuSig2SignSweepRes) GetPartialSignature() []byte { return nil } +type ServerPushKeyReq struct { + state protoimpl.MessageState + sizeCache protoimpl.SizeCache + unknownFields protoimpl.UnknownFields + + // The protocol version that the client adheres to. + ProtocolVersion ProtocolVersion `protobuf:"varint,1,opt,name=protocol_version,json=protocolVersion,proto3,enum=looprpc.ProtocolVersion" json:"protocol_version,omitempty"` + // The swap hash. + SwapHash []byte `protobuf:"bytes,2,opt,name=swap_hash,json=swapHash,proto3" json:"swap_hash,omitempty"` + // The client’s private key used in the HTLC’s aggregated internal key. + InternalPrivkey []byte `protobuf:"bytes,3,opt,name=internal_privkey,json=internalPrivkey,proto3" json:"internal_privkey,omitempty"` +} + +func (x *ServerPushKeyReq) Reset() { + *x = ServerPushKeyReq{} + if protoimpl.UnsafeEnabled { + mi := &file_server_proto_msgTypes[29] + ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) + ms.StoreMessageInfo(mi) + } +} + +func (x *ServerPushKeyReq) String() string { + return protoimpl.X.MessageStringOf(x) +} + +func (*ServerPushKeyReq) ProtoMessage() {} + +func (x *ServerPushKeyReq) ProtoReflect() protoreflect.Message { + mi := &file_server_proto_msgTypes[29] + if protoimpl.UnsafeEnabled && x != nil { + ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) + if ms.LoadMessageInfo() == nil { + ms.StoreMessageInfo(mi) + } + return ms + } + return mi.MessageOf(x) +} + +// Deprecated: Use ServerPushKeyReq.ProtoReflect.Descriptor instead. +func (*ServerPushKeyReq) Descriptor() ([]byte, []int) { + return file_server_proto_rawDescGZIP(), []int{29} +} + +func (x *ServerPushKeyReq) GetProtocolVersion() ProtocolVersion { + if x != nil { + return x.ProtocolVersion + } + return ProtocolVersion_LEGACY +} + +func (x *ServerPushKeyReq) GetSwapHash() []byte { + if x != nil { + return x.SwapHash + } + return nil +} + +func (x *ServerPushKeyReq) GetInternalPrivkey() []byte { + if x != nil { + return x.InternalPrivkey + } + return nil +} + +type ServerPushKeyRes struct { + state protoimpl.MessageState + sizeCache protoimpl.SizeCache + unknownFields protoimpl.UnknownFields +} + +func (x *ServerPushKeyRes) Reset() { + *x = ServerPushKeyRes{} + if protoimpl.UnsafeEnabled { + mi := &file_server_proto_msgTypes[30] + ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) + ms.StoreMessageInfo(mi) + } +} + +func (x *ServerPushKeyRes) String() string { + return protoimpl.X.MessageStringOf(x) +} + +func (*ServerPushKeyRes) ProtoMessage() {} + +func (x *ServerPushKeyRes) ProtoReflect() protoreflect.Message { + mi := &file_server_proto_msgTypes[30] + if protoimpl.UnsafeEnabled && x != nil { + ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) + if ms.LoadMessageInfo() == nil { + ms.StoreMessageInfo(mi) + } + return ms + } + return mi.MessageOf(x) +} + +// Deprecated: Use ServerPushKeyRes.ProtoReflect.Descriptor instead. +func (*ServerPushKeyRes) Descriptor() ([]byte, []int) { + return file_server_proto_rawDescGZIP(), []int{30} +} + var File_server_proto protoreflect.FileDescriptor var file_server_proto_rawDesc = []byte{ @@ -2715,160 +2819,176 @@ var file_server_proto_rawDesc = []byte{ 0x6f, 0x6e, 0x63, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x05, 0x6e, 0x6f, 0x6e, 0x63, 0x65, 0x12, 0x2b, 0x0a, 0x11, 0x70, 0x61, 0x72, 0x74, 0x69, 0x61, 0x6c, 0x5f, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x74, 0x75, 0x72, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x10, 0x70, 0x61, - 0x72, 0x74, 0x69, 0x61, 0x6c, 0x53, 0x69, 0x67, 0x6e, 0x61, 0x74, 0x75, 0x72, 0x65, 0x2a, 0xef, - 0x01, 0x0a, 0x0f, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x56, 0x65, 0x72, 0x73, 0x69, - 0x6f, 0x6e, 0x12, 0x0a, 0x0a, 0x06, 0x4c, 0x45, 0x47, 0x41, 0x43, 0x59, 0x10, 0x00, 0x12, 0x12, - 0x0a, 0x0e, 0x4d, 0x55, 0x4c, 0x54, 0x49, 0x5f, 0x4c, 0x4f, 0x4f, 0x50, 0x5f, 0x4f, 0x55, 0x54, - 0x10, 0x01, 0x12, 0x19, 0x0a, 0x15, 0x4e, 0x41, 0x54, 0x49, 0x56, 0x45, 0x5f, 0x53, 0x45, 0x47, - 0x57, 0x49, 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-2884,7 +3004,7 @@ func file_server_proto_rawDescGZIP() []byte { } var file_server_proto_enumTypes = make([]protoimpl.EnumInfo, 5) -var file_server_proto_msgTypes = make([]protoimpl.MessageInfo, 29) +var file_server_proto_msgTypes = make([]protoimpl.MessageInfo, 31) var file_server_proto_goTypes = []interface{}{ (ProtocolVersion)(0), // 0: looprpc.ProtocolVersion (ServerSwapState)(0), // 1: looprpc.ServerSwapState @@ -2920,14 +3040,16 @@ var file_server_proto_goTypes = []interface{}{ (*ReportRoutingResultRes)(nil), // 31: looprpc.ReportRoutingResultRes (*MuSig2SignSweepReq)(nil), // 32: looprpc.MuSig2SignSweepReq (*MuSig2SignSweepRes)(nil), // 33: looprpc.MuSig2SignSweepRes - (*RouteHint)(nil), // 34: looprpc.RouteHint + (*ServerPushKeyReq)(nil), // 34: looprpc.ServerPushKeyReq + (*ServerPushKeyRes)(nil), // 35: looprpc.ServerPushKeyRes + (*RouteHint)(nil), // 36: looprpc.RouteHint } var file_server_proto_depIdxs = []int32{ 0, // 0: looprpc.ServerLoopOutRequest.protocol_version:type_name -> looprpc.ProtocolVersion 0, // 1: looprpc.ServerLoopOutQuoteRequest.protocol_version:type_name -> looprpc.ProtocolVersion 0, // 2: looprpc.ServerLoopOutTermsRequest.protocol_version:type_name -> looprpc.ProtocolVersion 0, // 3: looprpc.ServerLoopInRequest.protocol_version:type_name -> looprpc.ProtocolVersion - 34, // 4: looprpc.ServerLoopInQuoteRequest.route_hints:type_name -> looprpc.RouteHint + 36, // 4: looprpc.ServerLoopInQuoteRequest.route_hints:type_name -> looprpc.RouteHint 0, // 5: looprpc.ServerLoopInQuoteRequest.protocol_version:type_name -> looprpc.ProtocolVersion 0, // 6: looprpc.ServerLoopInTermsRequest.protocol_version:type_name -> looprpc.ProtocolVersion 0, // 7: looprpc.ServerLoopOutPushPreimageRequest.protocol_version:type_name -> looprpc.ProtocolVersion @@ -2940,45 +3062,48 @@ var file_server_proto_depIdxs = []int32{ 0, // 14: looprpc.CancelLoopOutSwapRequest.protocol_version:type_name -> looprpc.ProtocolVersion 22, // 15: looprpc.CancelLoopOutSwapRequest.route_cancel:type_name -> looprpc.RouteCancel 0, // 16: looprpc.ServerProbeRequest.protocol_version:type_name -> looprpc.ProtocolVersion - 34, // 17: looprpc.ServerProbeRequest.route_hints:type_name -> looprpc.RouteHint + 36, // 17: looprpc.ServerProbeRequest.route_hints:type_name -> looprpc.RouteHint 0, // 18: looprpc.RecommendRoutingPluginReq.protocol_version:type_name -> looprpc.ProtocolVersion 4, // 19: looprpc.RecommendRoutingPluginRes.plugin:type_name -> looprpc.RoutingPlugin 0, // 20: looprpc.ReportRoutingResultReq.protocol_version:type_name -> looprpc.ProtocolVersion 4, // 21: looprpc.ReportRoutingResultReq.plugin:type_name -> looprpc.RoutingPlugin 0, // 22: looprpc.MuSig2SignSweepReq.protocol_version:type_name -> looprpc.ProtocolVersion - 9, // 23: looprpc.SwapServer.LoopOutTerms:input_type -> looprpc.ServerLoopOutTermsRequest - 5, // 24: looprpc.SwapServer.NewLoopOutSwap:input_type -> looprpc.ServerLoopOutRequest - 17, // 25: looprpc.SwapServer.LoopOutPushPreimage:input_type -> looprpc.ServerLoopOutPushPreimageRequest - 7, // 26: looprpc.SwapServer.LoopOutQuote:input_type -> looprpc.ServerLoopOutQuoteRequest - 15, // 27: looprpc.SwapServer.LoopInTerms:input_type -> looprpc.ServerLoopInTermsRequest - 11, // 28: looprpc.SwapServer.NewLoopInSwap:input_type -> looprpc.ServerLoopInRequest - 13, // 29: looprpc.SwapServer.LoopInQuote:input_type -> looprpc.ServerLoopInQuoteRequest - 19, // 30: looprpc.SwapServer.SubscribeLoopOutUpdates:input_type -> looprpc.SubscribeUpdatesRequest - 19, // 31: looprpc.SwapServer.SubscribeLoopInUpdates:input_type -> looprpc.SubscribeUpdatesRequest - 24, // 32: looprpc.SwapServer.CancelLoopOutSwap:input_type -> looprpc.CancelLoopOutSwapRequest - 26, // 33: looprpc.SwapServer.Probe:input_type -> looprpc.ServerProbeRequest - 28, // 34: looprpc.SwapServer.RecommendRoutingPlugin:input_type -> looprpc.RecommendRoutingPluginReq - 30, // 35: looprpc.SwapServer.ReportRoutingResult:input_type -> looprpc.ReportRoutingResultReq - 32, // 36: looprpc.SwapServer.MuSig2SignSweep:input_type -> looprpc.MuSig2SignSweepReq - 10, // 37: looprpc.SwapServer.LoopOutTerms:output_type -> looprpc.ServerLoopOutTerms - 6, // 38: looprpc.SwapServer.NewLoopOutSwap:output_type -> looprpc.ServerLoopOutResponse - 18, // 39: looprpc.SwapServer.LoopOutPushPreimage:output_type -> looprpc.ServerLoopOutPushPreimageResponse - 8, // 40: looprpc.SwapServer.LoopOutQuote:output_type -> looprpc.ServerLoopOutQuote - 16, // 41: looprpc.SwapServer.LoopInTerms:output_type -> looprpc.ServerLoopInTerms - 12, // 42: looprpc.SwapServer.NewLoopInSwap:output_type -> looprpc.ServerLoopInResponse - 14, // 43: looprpc.SwapServer.LoopInQuote:output_type -> looprpc.ServerLoopInQuoteResponse - 20, // 44: looprpc.SwapServer.SubscribeLoopOutUpdates:output_type -> looprpc.SubscribeLoopOutUpdatesResponse - 21, // 45: looprpc.SwapServer.SubscribeLoopInUpdates:output_type -> looprpc.SubscribeLoopInUpdatesResponse - 25, // 46: looprpc.SwapServer.CancelLoopOutSwap:output_type -> looprpc.CancelLoopOutSwapResponse - 27, // 47: looprpc.SwapServer.Probe:output_type -> looprpc.ServerProbeResponse - 29, // 48: looprpc.SwapServer.RecommendRoutingPlugin:output_type -> looprpc.RecommendRoutingPluginRes - 31, // 49: looprpc.SwapServer.ReportRoutingResult:output_type -> looprpc.ReportRoutingResultRes - 33, // 50: looprpc.SwapServer.MuSig2SignSweep:output_type -> looprpc.MuSig2SignSweepRes - 37, // [37:51] is the sub-list for method output_type - 23, // [23:37] is the sub-list for method input_type - 23, // [23:23] is the sub-list for extension type_name - 23, // [23:23] is the sub-list for extension extendee - 0, // [0:23] is the sub-list for field type_name + 0, // 23: looprpc.ServerPushKeyReq.protocol_version:type_name -> looprpc.ProtocolVersion + 9, // 24: looprpc.SwapServer.LoopOutTerms:input_type -> looprpc.ServerLoopOutTermsRequest + 5, // 25: looprpc.SwapServer.NewLoopOutSwap:input_type -> looprpc.ServerLoopOutRequest + 17, // 26: looprpc.SwapServer.LoopOutPushPreimage:input_type -> looprpc.ServerLoopOutPushPreimageRequest + 7, // 27: looprpc.SwapServer.LoopOutQuote:input_type -> looprpc.ServerLoopOutQuoteRequest + 15, // 28: looprpc.SwapServer.LoopInTerms:input_type -> looprpc.ServerLoopInTermsRequest + 11, // 29: looprpc.SwapServer.NewLoopInSwap:input_type -> looprpc.ServerLoopInRequest + 13, // 30: looprpc.SwapServer.LoopInQuote:input_type -> looprpc.ServerLoopInQuoteRequest + 19, // 31: looprpc.SwapServer.SubscribeLoopOutUpdates:input_type -> looprpc.SubscribeUpdatesRequest + 19, // 32: looprpc.SwapServer.SubscribeLoopInUpdates:input_type -> looprpc.SubscribeUpdatesRequest + 24, // 33: looprpc.SwapServer.CancelLoopOutSwap:input_type -> looprpc.CancelLoopOutSwapRequest + 26, // 34: looprpc.SwapServer.Probe:input_type -> looprpc.ServerProbeRequest + 28, // 35: looprpc.SwapServer.RecommendRoutingPlugin:input_type -> looprpc.RecommendRoutingPluginReq + 30, // 36: looprpc.SwapServer.ReportRoutingResult:input_type -> looprpc.ReportRoutingResultReq + 32, // 37: looprpc.SwapServer.MuSig2SignSweep:input_type -> looprpc.MuSig2SignSweepReq + 34, // 38: looprpc.SwapServer.PushKey:input_type -> looprpc.ServerPushKeyReq + 10, // 39: looprpc.SwapServer.LoopOutTerms:output_type -> looprpc.ServerLoopOutTerms + 6, // 40: looprpc.SwapServer.NewLoopOutSwap:output_type -> looprpc.ServerLoopOutResponse + 18, // 41: looprpc.SwapServer.LoopOutPushPreimage:output_type -> looprpc.ServerLoopOutPushPreimageResponse + 8, // 42: looprpc.SwapServer.LoopOutQuote:output_type -> looprpc.ServerLoopOutQuote + 16, // 43: looprpc.SwapServer.LoopInTerms:output_type -> looprpc.ServerLoopInTerms + 12, // 44: looprpc.SwapServer.NewLoopInSwap:output_type -> looprpc.ServerLoopInResponse + 14, // 45: looprpc.SwapServer.LoopInQuote:output_type -> looprpc.ServerLoopInQuoteResponse + 20, // 46: looprpc.SwapServer.SubscribeLoopOutUpdates:output_type -> looprpc.SubscribeLoopOutUpdatesResponse + 21, // 47: looprpc.SwapServer.SubscribeLoopInUpdates:output_type -> looprpc.SubscribeLoopInUpdatesResponse + 25, // 48: looprpc.SwapServer.CancelLoopOutSwap:output_type -> looprpc.CancelLoopOutSwapResponse + 27, // 49: looprpc.SwapServer.Probe:output_type -> looprpc.ServerProbeResponse + 29, // 50: looprpc.SwapServer.RecommendRoutingPlugin:output_type -> looprpc.RecommendRoutingPluginRes + 31, // 51: looprpc.SwapServer.ReportRoutingResult:output_type -> looprpc.ReportRoutingResultRes + 33, // 52: looprpc.SwapServer.MuSig2SignSweep:output_type -> looprpc.MuSig2SignSweepRes + 35, // 53: looprpc.SwapServer.PushKey:output_type -> looprpc.ServerPushKeyRes + 39, // [39:54] is the sub-list for method output_type + 24, // [24:39] is the sub-list for method input_type + 24, // [24:24] is the sub-list for extension type_name + 24, // [24:24] is the sub-list for extension extendee + 0, // [0:24] is the sub-list for field type_name } func init() { file_server_proto_init() } @@ -3336,6 +3461,30 @@ func file_server_proto_init() { return nil } } + file_server_proto_msgTypes[29].Exporter = func(v interface{}, i int) interface{} { + switch v := v.(*ServerPushKeyReq); i { + case 0: + return &v.state + case 1: + return &v.sizeCache + case 2: + return &v.unknownFields + default: + return nil + } + } + file_server_proto_msgTypes[30].Exporter = func(v interface{}, i int) interface{} { + switch v := v.(*ServerPushKeyRes); i { + case 0: + return &v.state + case 1: + return &v.sizeCache + case 2: + return &v.unknownFields + default: + return nil + } + } } file_server_proto_msgTypes[19].OneofWrappers = []interface{}{ (*CancelLoopOutSwapRequest_RouteCancel)(nil), @@ -3346,7 +3495,7 @@ func file_server_proto_init() { GoPackagePath: reflect.TypeOf(x{}).PkgPath(), RawDescriptor: file_server_proto_rawDesc, NumEnums: 5, - NumMessages: 29, + NumMessages: 31, NumExtensions: 0, NumServices: 1, }, diff --git a/swapserverrpc/server.proto b/swapserverrpc/server.proto index 54d8fec..c684c8f 100644 --- a/swapserverrpc/server.proto +++ b/swapserverrpc/server.proto @@ -45,6 +45,8 @@ service SwapServer { returns (ReportRoutingResultRes); rpc MuSig2SignSweep (MuSig2SignSweepReq) returns (MuSig2SignSweepRes); + + rpc PushKey (ServerPushKeyReq) returns (ServerPushKeyRes); } /** @@ -566,3 +568,17 @@ message MuSig2SignSweepRes { // The partial signature of the server for the requested sighash. bytes partial_signature = 2; } + +message ServerPushKeyReq { + // The protocol version that the client adheres to. + ProtocolVersion protocol_version = 1; + + // The swap hash. + bytes swap_hash = 2; + + // The client’s private key used in the HTLC’s aggregated internal key. + bytes internal_privkey = 3; +} + +message ServerPushKeyRes { +} diff --git a/swapserverrpc/server_grpc.pb.go b/swapserverrpc/server_grpc.pb.go index d0b3226..75c71ea 100644 --- a/swapserverrpc/server_grpc.pb.go +++ b/swapserverrpc/server_grpc.pb.go @@ -32,6 +32,7 @@ type SwapServerClient interface { RecommendRoutingPlugin(ctx context.Context, in *RecommendRoutingPluginReq, opts ...grpc.CallOption) (*RecommendRoutingPluginRes, error) ReportRoutingResult(ctx context.Context, in *ReportRoutingResultReq, opts ...grpc.CallOption) (*ReportRoutingResultRes, error) MuSig2SignSweep(ctx context.Context, in *MuSig2SignSweepReq, opts ...grpc.CallOption) (*MuSig2SignSweepRes, error) + PushKey(ctx context.Context, in *ServerPushKeyReq, opts ...grpc.CallOption) (*ServerPushKeyRes, error) } type swapServerClient struct { @@ -214,6 +215,15 @@ func (c *swapServerClient) MuSig2SignSweep(ctx context.Context, in *MuSig2SignSw return out, nil } +func (c *swapServerClient) PushKey(ctx context.Context, in *ServerPushKeyReq, opts ...grpc.CallOption) (*ServerPushKeyRes, error) { + out := new(ServerPushKeyRes) + err := c.cc.Invoke(ctx, "/looprpc.SwapServer/PushKey", in, out, opts...) + if err != nil { + return nil, err + } + return out, nil +} + // SwapServerServer is the server API for SwapServer service. // All implementations must embed UnimplementedSwapServerServer // for forward compatibility @@ -232,6 +242,7 @@ type SwapServerServer interface { RecommendRoutingPlugin(context.Context, *RecommendRoutingPluginReq) (*RecommendRoutingPluginRes, error) ReportRoutingResult(context.Context, *ReportRoutingResultReq) (*ReportRoutingResultRes, error) MuSig2SignSweep(context.Context, *MuSig2SignSweepReq) (*MuSig2SignSweepRes, error) + PushKey(context.Context, *ServerPushKeyReq) (*ServerPushKeyRes, error) mustEmbedUnimplementedSwapServerServer() } @@ -281,6 +292,9 @@ func (UnimplementedSwapServerServer) ReportRoutingResult(context.Context, *Repor func (UnimplementedSwapServerServer) MuSig2SignSweep(context.Context, *MuSig2SignSweepReq) (*MuSig2SignSweepRes, error) { return nil, status.Errorf(codes.Unimplemented, "method MuSig2SignSweep not implemented") } +func (UnimplementedSwapServerServer) PushKey(context.Context, *ServerPushKeyReq) (*ServerPushKeyRes, error) { + return nil, status.Errorf(codes.Unimplemented, "method PushKey not implemented") +} func (UnimplementedSwapServerServer) mustEmbedUnimplementedSwapServerServer() {} // UnsafeSwapServerServer may be embedded to opt out of forward compatibility for this service. @@ -552,6 +566,24 @@ func _SwapServer_MuSig2SignSweep_Handler(srv interface{}, ctx context.Context, d return interceptor(ctx, in, info, handler) } +func _SwapServer_PushKey_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) { + in := new(ServerPushKeyReq) + if err := dec(in); err != nil { + return nil, err + } + if interceptor == nil { + return srv.(SwapServerServer).PushKey(ctx, in) + } + info := &grpc.UnaryServerInfo{ + Server: srv, + FullMethod: "/looprpc.SwapServer/PushKey", + } + handler := func(ctx context.Context, req interface{}) (interface{}, error) { + return srv.(SwapServerServer).PushKey(ctx, req.(*ServerPushKeyReq)) + } + return interceptor(ctx, in, info, handler) +} + // SwapServer_ServiceDesc is the grpc.ServiceDesc for SwapServer service. // It's only intended for direct use with grpc.RegisterService, // and not to be introspected or modified (even as a copy) @@ -607,6 +639,10 @@ var SwapServer_ServiceDesc = grpc.ServiceDesc{ MethodName: "MuSig2SignSweep", Handler: _SwapServer_MuSig2SignSweep_Handler, }, + { + MethodName: "PushKey", + Handler: _SwapServer_PushKey_Handler, + }, }, Streams: []grpc.StreamDesc{ { From cd91f90ed28987559d5260e9f344af7fea166664 Mon Sep 17 00:00:00 2001 From: Andras Banki-Horvath Date: Mon, 9 Jan 2023 19:01:07 +0100 Subject: [PATCH 5/5] loop: use MuSig2 1.0 scheme for the new MuSig2 swaps --- client_test.go | 32 +++++++------------------------- loopin_test.go | 35 +++-------------------------------- loopout.go | 31 +++++++++++++++++++++++-------- swap.go | 9 ++++++++- 4 files changed, 41 insertions(+), 66 deletions(-) diff --git a/client_test.go b/client_test.go index ba3ff6e..a6297dd 100644 --- a/client_test.go +++ b/client_test.go @@ -13,7 +13,6 @@ import ( "github.com/lightninglabs/loop/loopdb" "github.com/lightninglabs/loop/swap" "github.com/lightninglabs/loop/test" - "github.com/lightningnetwork/lnd/input" "github.com/lightningnetwork/lnd/lnrpc" "github.com/lightningnetwork/lnd/lntypes" "github.com/stretchr/testify/require" @@ -277,30 +276,13 @@ func testLoopOutResume(t *testing.T, confs uint32, expired, preimageRevealed, // Expect client to register for our expected number of confirmations. confIntent := ctx.AssertRegisterConf(preimageRevealed, int32(confs)) - // Assert that the loopout htlc equals to the expected one. - scriptVersion := GetHtlcScriptVersion(protocolVersion) - var htlc *swap.Htlc - - switch scriptVersion { - case swap.HtlcV2: - htlc, err = swap.NewHtlcV2( - pendingSwap.Contract.CltvExpiry, senderKey, - receiverKey, hash, &chaincfg.TestNet3Params, - ) - - case swap.HtlcV3: - htlc, err = swap.NewHtlcV3( - input.MuSig2Version040, - pendingSwap.Contract.CltvExpiry, senderKey, - receiverKey, senderKey, receiverKey, hash, - &chaincfg.TestNet3Params, - ) - - default: - t.Fatalf(swap.ErrInvalidScriptVersion.Error()) - } - + htlc, err := GetHtlc( + hash, &pendingSwap.Contract.SwapContract, + &chaincfg.TestNet3Params, + ) require.NoError(t, err) + + // Assert that the loopout htlc equals to the expected one. require.Equal(t, htlc.PkScript, confIntent.PkScript) signalSwapPaymentResult(nil) @@ -319,7 +301,7 @@ func testLoopOutResume(t *testing.T, confs uint32, expired, preimageRevealed, func(r error) {}, func(r error) {}, preimageRevealed, - confIntent, scriptVersion, + confIntent, GetHtlcScriptVersion(protocolVersion), ) } diff --git a/loopin_test.go b/loopin_test.go index ca3b707..de4452b 100644 --- a/loopin_test.go +++ b/loopin_test.go @@ -8,10 +8,8 @@ import ( "github.com/btcsuite/btcd/btcutil" "github.com/btcsuite/btcd/wire" "github.com/lightninglabs/loop/loopdb" - "github.com/lightninglabs/loop/swap" "github.com/lightninglabs/loop/test" "github.com/lightningnetwork/lnd/chainntnfs" - "github.com/lightningnetwork/lnd/input" invpkg "github.com/lightningnetwork/lnd/invoices" "github.com/lightningnetwork/lnd/routing/route" "github.com/stretchr/testify/require" @@ -450,37 +448,10 @@ func testLoopInResume(t *testing.T, state loopdb.SwapState, expired bool, pendSwap.Loop.Events[0].Cost = cost } - var ( - htlc *swap.Htlc - err error + htlc, err := GetHtlc( + testPreimage.Hash(), &contract.SwapContract, + cfg.lnd.ChainParams, ) - - switch GetHtlcScriptVersion(storedVersion) { - case swap.HtlcV2: - htlc, err = swap.NewHtlcV2( - contract.CltvExpiry, - contract.HtlcKeys.SenderScriptKey, - contract.HtlcKeys.ReceiverScriptKey, - testPreimage.Hash(), - cfg.lnd.ChainParams, - ) - - case swap.HtlcV3: - htlc, err = swap.NewHtlcV3( - input.MuSig2Version040, - contract.CltvExpiry, - contract.HtlcKeys.SenderInternalPubKey, - contract.HtlcKeys.ReceiverInternalPubKey, - contract.HtlcKeys.SenderScriptKey, - contract.HtlcKeys.ReceiverScriptKey, - testPreimage.Hash(), - cfg.lnd.ChainParams, - ) - - default: - t.Fatalf("unknown HTLC script version") - } - require.NoError(t, err) err = ctx.store.CreateLoopIn(testPreimage.Hash(), contract) diff --git a/loopout.go b/loopout.go index ff9bd92..eca55bc 100644 --- a/loopout.go +++ b/loopout.go @@ -1355,12 +1355,28 @@ func (s *loopOutSwap) createMuSig2SweepTxn( return nil, err } - signers := [][]byte{ - s.HtlcKeys.SenderInternalPubKey[1:], - s.HtlcKeys.ReceiverInternalPubKey[1:], + var ( + signers [][]byte + muSig2Verion input.MuSig2Version + ) + + // Depending on the MuSig2 version we either pass 32 byte Schnorr + // public keys or normal 33 byte public keys. + if s.ProtocolVersion >= loopdb.ProtocolVersionMuSig2 { + muSig2Verion = input.MuSig2Version100RC2 + signers = [][]byte{ + s.HtlcKeys.SenderInternalPubKey[:], + s.HtlcKeys.ReceiverInternalPubKey[:], + } + } else { + muSig2Verion = input.MuSig2Version040 + signers = [][]byte{ + s.HtlcKeys.SenderInternalPubKey[1:], + s.HtlcKeys.ReceiverInternalPubKey[1:], + } } - htlc, ok := s.htlc.HtlcScript.(*swap.HtlcScriptV3) + htlcScript, ok := s.htlc.HtlcScript.(*swap.HtlcScriptV3) if !ok { return nil, fmt.Errorf("non taproot htlc") } @@ -1368,9 +1384,8 @@ func (s *loopOutSwap) createMuSig2SweepTxn( // Now we're creating a local MuSig2 session using the receiver key's // key locator and the htlc's root hash. musig2SessionInfo, err := s.lnd.Signer.MuSig2CreateSession( - ctx, input.MuSig2Version040, - &s.HtlcKeys.ClientScriptKeyLocator, signers, - lndclient.MuSig2TaprootTweakOpt(htlc.RootHash[:], false), + ctx, muSig2Verion, &s.HtlcKeys.ClientScriptKeyLocator, signers, + lndclient.MuSig2TaprootTweakOpt(htlcScript.RootHash[:], false), ) if err != nil { return nil, err @@ -1434,7 +1449,7 @@ func (s *loopOutSwap) createMuSig2SweepTxn( // To be sure that we're good, parse and validate that the combined // signature is indeed valid for the sig hash and the internal pubkey. err = s.executeConfig.verifySchnorrSig( - htlc.TaprootKey, sigHash, finalSig, + htlcScript.TaprootKey, sigHash, finalSig, ) if err != nil { return nil, err diff --git a/swap.go b/swap.go index caa5d21..d816990 100644 --- a/swap.go +++ b/swap.go @@ -82,8 +82,15 @@ func GetHtlc(hash lntypes.Hash, contract *loopdb.SwapContract, ) case swap.HtlcV3: + // Swaps that implement the new MuSig2 protocol will be expected + // to use the 1.0RC2 MuSig2 key derivation scheme. + muSig2Version := input.MuSig2Version040 + if contract.ProtocolVersion >= loopdb.ProtocolVersionMuSig2 { + muSig2Version = input.MuSig2Version100RC2 + } + return swap.NewHtlcV3( - input.MuSig2Version040, + muSig2Version, contract.CltvExpiry, contract.HtlcKeys.SenderInternalPubKey, contract.HtlcKeys.ReceiverInternalPubKey,