592 lines
17 KiB
Go
592 lines
17 KiB
Go
package lnwallet
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import (
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"bytes"
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"crypto/rand"
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"crypto/sha256"
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"encoding/binary"
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"encoding/hex"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"sync"
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"github.com/btcsuite/btcd/btcec"
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"github.com/btcsuite/btcd/chaincfg"
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"github.com/btcsuite/btcd/chaincfg/chainhash"
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"github.com/btcsuite/btcd/txscript"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil"
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"github.com/lightningnetwork/lnd/channeldb"
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"github.com/lightningnetwork/lnd/keychain"
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"github.com/lightningnetwork/lnd/lnwire"
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"github.com/lightningnetwork/lnd/shachain"
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)
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var (
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privPass = []byte("private-test")
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// For simplicity a single priv key controls all of our test outputs.
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testWalletPrivKey = []byte{
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0x2b, 0xd8, 0x06, 0xc9, 0x7f, 0x0e, 0x00, 0xaf,
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0x1a, 0x1f, 0xc3, 0x32, 0x8f, 0xa7, 0x63, 0xa9,
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0x26, 0x97, 0x23, 0xc8, 0xdb, 0x8f, 0xac, 0x4f,
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0x93, 0xaf, 0x71, 0xdb, 0x18, 0x6d, 0x6e, 0x90,
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}
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// We're alice :)
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bobsPrivKey = []byte{
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0x81, 0xb6, 0x37, 0xd8, 0xfc, 0xd2, 0xc6, 0xda,
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0x63, 0x59, 0xe6, 0x96, 0x31, 0x13, 0xa1, 0x17,
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0xd, 0xe7, 0x95, 0xe4, 0xb7, 0x25, 0xb8, 0x4d,
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0x1e, 0xb, 0x4c, 0xfd, 0x9e, 0xc5, 0x8c, 0xe9,
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}
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// Use a hard-coded HD seed.
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testHdSeed = chainhash.Hash{
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0xb7, 0x94, 0x38, 0x5f, 0x2d, 0x1e, 0xf7, 0xab,
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0x4d, 0x92, 0x73, 0xd1, 0x90, 0x63, 0x81, 0xb4,
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0x4f, 0x2f, 0x6f, 0x25, 0x88, 0xa3, 0xef, 0xb9,
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0x6a, 0x49, 0x18, 0x83, 0x31, 0x98, 0x47, 0x53,
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}
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// The number of confirmations required to consider any created channel
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// open.
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numReqConfs = uint16(1)
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// A serializable txn for testing funding txn.
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testTx = &wire.MsgTx{
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Version: 1,
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TxIn: []*wire.TxIn{
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{
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PreviousOutPoint: wire.OutPoint{
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Hash: chainhash.Hash{},
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Index: 0xffffffff,
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},
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SignatureScript: []byte{0x04, 0x31, 0xdc, 0x00, 0x1b, 0x01, 0x62},
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Sequence: 0xffffffff,
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},
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},
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TxOut: []*wire.TxOut{
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{
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Value: 5000000000,
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PkScript: []byte{
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0x41, // OP_DATA_65
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0x04, 0xd6, 0x4b, 0xdf, 0xd0, 0x9e, 0xb1, 0xc5,
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0xfe, 0x29, 0x5a, 0xbd, 0xeb, 0x1d, 0xca, 0x42,
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0x81, 0xbe, 0x98, 0x8e, 0x2d, 0xa0, 0xb6, 0xc1,
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0xc6, 0xa5, 0x9d, 0xc2, 0x26, 0xc2, 0x86, 0x24,
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0xe1, 0x81, 0x75, 0xe8, 0x51, 0xc9, 0x6b, 0x97,
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0x3d, 0x81, 0xb0, 0x1c, 0xc3, 0x1f, 0x04, 0x78,
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0x34, 0xbc, 0x06, 0xd6, 0xd6, 0xed, 0xf6, 0x20,
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0xd1, 0x84, 0x24, 0x1a, 0x6a, 0xed, 0x8b, 0x63,
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0xa6, // 65-byte signature
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0xac, // OP_CHECKSIG
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},
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},
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},
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LockTime: 5,
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}
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)
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// CreateTestChannels creates to fully populated channels to be used within
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// testing fixtures. The channels will be returned as if the funding process
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// has just completed. The channel itself is funded with 10 BTC, with 5 BTC
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// allocated to each side. Within the channel, Alice is the initiator. The
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// function also returns a "cleanup" function that is meant to be called once
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// the test has been finalized. The clean up function will remote all temporary
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// files created
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func CreateTestChannels() (*LightningChannel, *LightningChannel, func(), error) {
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channelCapacity, err := btcutil.NewAmount(10)
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if err != nil {
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return nil, nil, nil, err
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}
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channelBal := channelCapacity / 2
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aliceDustLimit := btcutil.Amount(200)
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bobDustLimit := btcutil.Amount(1300)
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csvTimeoutAlice := uint32(5)
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csvTimeoutBob := uint32(4)
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prevOut := &wire.OutPoint{
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Hash: chainhash.Hash(testHdSeed),
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Index: 0,
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}
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fundingTxIn := wire.NewTxIn(prevOut, nil, nil)
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// For each party, we'll create a distinct set of keys in order to
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// emulate the typical set up with live channels.
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var (
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aliceKeys []*btcec.PrivateKey
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bobKeys []*btcec.PrivateKey
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)
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for i := 0; i < 5; i++ {
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key := make([]byte, len(testWalletPrivKey))
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copy(key[:], testWalletPrivKey[:])
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key[0] ^= byte(i + 1)
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aliceKey, _ := btcec.PrivKeyFromBytes(btcec.S256(), key)
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aliceKeys = append(aliceKeys, aliceKey)
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key = make([]byte, len(bobsPrivKey))
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copy(key[:], bobsPrivKey)
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key[0] ^= byte(i + 1)
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bobKey, _ := btcec.PrivKeyFromBytes(btcec.S256(), key)
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bobKeys = append(bobKeys, bobKey)
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}
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aliceCfg := channeldb.ChannelConfig{
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ChannelConstraints: channeldb.ChannelConstraints{
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DustLimit: aliceDustLimit,
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MaxPendingAmount: lnwire.NewMSatFromSatoshis(channelCapacity),
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ChanReserve: channelCapacity / 100,
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MinHTLC: 0,
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MaxAcceptedHtlcs: MaxHTLCNumber / 2,
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},
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CsvDelay: uint16(csvTimeoutAlice),
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MultiSigKey: keychain.KeyDescriptor{
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PubKey: aliceKeys[0].PubKey(),
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},
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RevocationBasePoint: keychain.KeyDescriptor{
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PubKey: aliceKeys[1].PubKey(),
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},
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PaymentBasePoint: keychain.KeyDescriptor{
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PubKey: aliceKeys[2].PubKey(),
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},
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DelayBasePoint: keychain.KeyDescriptor{
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PubKey: aliceKeys[3].PubKey(),
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},
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HtlcBasePoint: keychain.KeyDescriptor{
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PubKey: aliceKeys[4].PubKey(),
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},
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}
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bobCfg := channeldb.ChannelConfig{
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ChannelConstraints: channeldb.ChannelConstraints{
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DustLimit: bobDustLimit,
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MaxPendingAmount: lnwire.NewMSatFromSatoshis(channelCapacity),
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ChanReserve: channelCapacity / 100,
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MinHTLC: 0,
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MaxAcceptedHtlcs: MaxHTLCNumber / 2,
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},
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CsvDelay: uint16(csvTimeoutBob),
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MultiSigKey: keychain.KeyDescriptor{
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PubKey: bobKeys[0].PubKey(),
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},
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RevocationBasePoint: keychain.KeyDescriptor{
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PubKey: bobKeys[1].PubKey(),
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},
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PaymentBasePoint: keychain.KeyDescriptor{
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PubKey: bobKeys[2].PubKey(),
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},
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DelayBasePoint: keychain.KeyDescriptor{
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PubKey: bobKeys[3].PubKey(),
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},
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HtlcBasePoint: keychain.KeyDescriptor{
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PubKey: bobKeys[4].PubKey(),
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},
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}
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bobRoot, err := chainhash.NewHash(bobKeys[0].Serialize())
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if err != nil {
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return nil, nil, nil, err
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}
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bobPreimageProducer := shachain.NewRevocationProducer(*bobRoot)
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bobFirstRevoke, err := bobPreimageProducer.AtIndex(0)
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if err != nil {
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return nil, nil, nil, err
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}
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bobCommitPoint := ComputeCommitmentPoint(bobFirstRevoke[:])
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aliceRoot, err := chainhash.NewHash(aliceKeys[0].Serialize())
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if err != nil {
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return nil, nil, nil, err
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}
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alicePreimageProducer := shachain.NewRevocationProducer(*aliceRoot)
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aliceFirstRevoke, err := alicePreimageProducer.AtIndex(0)
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if err != nil {
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return nil, nil, nil, err
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}
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aliceCommitPoint := ComputeCommitmentPoint(aliceFirstRevoke[:])
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aliceCommitTx, bobCommitTx, err := CreateCommitmentTxns(channelBal,
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channelBal, &aliceCfg, &bobCfg, aliceCommitPoint, bobCommitPoint,
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*fundingTxIn)
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if err != nil {
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return nil, nil, nil, err
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}
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alicePath, err := ioutil.TempDir("", "alicedb")
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dbAlice, err := channeldb.Open(alicePath)
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if err != nil {
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return nil, nil, nil, err
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}
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bobPath, err := ioutil.TempDir("", "bobdb")
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dbBob, err := channeldb.Open(bobPath)
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if err != nil {
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return nil, nil, nil, err
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}
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estimator := &StaticFeeEstimator{FeePerKW: 6000}
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feePerKw, err := estimator.EstimateFeePerKW(1)
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if err != nil {
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return nil, nil, nil, err
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}
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commitFee := calcStaticFee(0)
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aliceCommit := channeldb.ChannelCommitment{
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CommitHeight: 0,
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LocalBalance: lnwire.NewMSatFromSatoshis(channelBal - commitFee),
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RemoteBalance: lnwire.NewMSatFromSatoshis(channelBal),
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CommitFee: commitFee,
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FeePerKw: btcutil.Amount(feePerKw),
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CommitTx: aliceCommitTx,
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CommitSig: bytes.Repeat([]byte{1}, 71),
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}
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bobCommit := channeldb.ChannelCommitment{
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CommitHeight: 0,
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LocalBalance: lnwire.NewMSatFromSatoshis(channelBal),
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RemoteBalance: lnwire.NewMSatFromSatoshis(channelBal - commitFee),
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CommitFee: commitFee,
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FeePerKw: btcutil.Amount(feePerKw),
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CommitTx: bobCommitTx,
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CommitSig: bytes.Repeat([]byte{1}, 71),
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}
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var chanIDBytes [8]byte
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if _, err := io.ReadFull(rand.Reader, chanIDBytes[:]); err != nil {
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return nil, nil, nil, err
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}
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shortChanID := lnwire.NewShortChanIDFromInt(
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binary.BigEndian.Uint64(chanIDBytes[:]),
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)
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aliceChannelState := &channeldb.OpenChannel{
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LocalChanCfg: aliceCfg,
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RemoteChanCfg: bobCfg,
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IdentityPub: aliceKeys[0].PubKey(),
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FundingOutpoint: *prevOut,
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ShortChannelID: shortChanID,
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ChanType: channeldb.SingleFunder,
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IsInitiator: true,
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Capacity: channelCapacity,
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RemoteCurrentRevocation: bobCommitPoint,
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RevocationProducer: alicePreimageProducer,
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RevocationStore: shachain.NewRevocationStore(),
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LocalCommitment: aliceCommit,
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RemoteCommitment: aliceCommit,
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Db: dbAlice,
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Packager: channeldb.NewChannelPackager(shortChanID),
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FundingTxn: testTx,
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}
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bobChannelState := &channeldb.OpenChannel{
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LocalChanCfg: bobCfg,
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RemoteChanCfg: aliceCfg,
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IdentityPub: bobKeys[0].PubKey(),
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FundingOutpoint: *prevOut,
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ShortChannelID: shortChanID,
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ChanType: channeldb.SingleFunder,
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IsInitiator: false,
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Capacity: channelCapacity,
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RemoteCurrentRevocation: aliceCommitPoint,
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RevocationProducer: bobPreimageProducer,
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RevocationStore: shachain.NewRevocationStore(),
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LocalCommitment: bobCommit,
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RemoteCommitment: bobCommit,
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Db: dbBob,
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Packager: channeldb.NewChannelPackager(shortChanID),
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}
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aliceSigner := &mockSigner{privkeys: aliceKeys}
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bobSigner := &mockSigner{privkeys: bobKeys}
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pCache := &mockPreimageCache{
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// hash -> preimage
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preimageMap: make(map[[32]byte][]byte),
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}
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// TODO(roasbeef): make mock version of pre-image store
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channelAlice, err := NewLightningChannel(
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aliceSigner, pCache, aliceChannelState,
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)
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if err != nil {
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return nil, nil, nil, err
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}
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channelBob, err := NewLightningChannel(
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bobSigner, pCache, bobChannelState,
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)
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if err != nil {
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return nil, nil, nil, err
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}
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err = SetStateNumHint(
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aliceCommitTx, 0, channelAlice.stateHintObfuscator,
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)
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if err != nil {
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return nil, nil, nil, err
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}
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err = SetStateNumHint(
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bobCommitTx, 0, channelAlice.stateHintObfuscator,
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)
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if err != nil {
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return nil, nil, nil, err
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}
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if err := channelAlice.channelState.FullSync(); err != nil {
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return nil, nil, nil, err
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}
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if err := channelBob.channelState.FullSync(); err != nil {
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return nil, nil, nil, err
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}
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cleanUpFunc := func() {
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os.RemoveAll(bobPath)
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os.RemoveAll(alicePath)
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channelAlice.Stop()
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channelBob.Stop()
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}
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// Now that the channel are open, simulate the start of a session by
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// having Alice and Bob extend their revocation windows to each other.
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err = initRevocationWindows(channelAlice, channelBob)
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if err != nil {
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return nil, nil, nil, err
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}
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return channelAlice, channelBob, cleanUpFunc, nil
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}
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// initRevocationWindows simulates a new channel being opened within the p2p
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// network by populating the initial revocation windows of the passed
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// commitment state machines.
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func initRevocationWindows(chanA, chanB *LightningChannel) error {
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aliceNextRevoke, err := chanA.NextRevocationKey()
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if err != nil {
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return err
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}
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if err := chanB.InitNextRevocation(aliceNextRevoke); err != nil {
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return err
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}
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bobNextRevoke, err := chanB.NextRevocationKey()
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if err != nil {
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return err
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}
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if err := chanA.InitNextRevocation(bobNextRevoke); err != nil {
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return err
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}
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return nil
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}
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// mockSigner is a simple implementation of the Signer interface. Each one has
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// a set of private keys in a slice and can sign messages using the appropriate
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// one.
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type mockSigner struct {
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privkeys []*btcec.PrivateKey
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netParams *chaincfg.Params
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}
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func (m *mockSigner) SignOutputRaw(tx *wire.MsgTx, signDesc *SignDescriptor) ([]byte, error) {
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pubkey := signDesc.KeyDesc.PubKey
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switch {
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case signDesc.SingleTweak != nil:
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pubkey = TweakPubKeyWithTweak(pubkey, signDesc.SingleTweak)
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case signDesc.DoubleTweak != nil:
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pubkey = DeriveRevocationPubkey(pubkey, signDesc.DoubleTweak.PubKey())
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}
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hash160 := btcutil.Hash160(pubkey.SerializeCompressed())
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privKey := m.findKey(hash160, signDesc.SingleTweak, signDesc.DoubleTweak)
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if privKey == nil {
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return nil, fmt.Errorf("Mock signer does not have key")
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}
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sig, err := txscript.RawTxInWitnessSignature(tx, signDesc.SigHashes,
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signDesc.InputIndex, signDesc.Output.Value, signDesc.WitnessScript,
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txscript.SigHashAll, privKey)
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if err != nil {
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return nil, err
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}
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return sig[:len(sig)-1], nil
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}
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func (m *mockSigner) ComputeInputScript(tx *wire.MsgTx, signDesc *SignDescriptor) (*InputScript, error) {
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scriptType, addresses, _, err := txscript.ExtractPkScriptAddrs(
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signDesc.Output.PkScript, m.netParams)
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if err != nil {
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return nil, err
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}
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switch scriptType {
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case txscript.PubKeyHashTy:
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privKey := m.findKey(addresses[0].ScriptAddress(), signDesc.SingleTweak,
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signDesc.DoubleTweak)
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if privKey == nil {
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return nil, fmt.Errorf("Mock signer does not have key for "+
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"address %v", addresses[0])
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}
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scriptSig, err := txscript.SignatureScript(tx, signDesc.InputIndex,
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signDesc.Output.PkScript, txscript.SigHashAll, privKey, true)
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if err != nil {
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return nil, err
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}
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return &InputScript{ScriptSig: scriptSig}, nil
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case txscript.WitnessV0PubKeyHashTy:
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privKey := m.findKey(addresses[0].ScriptAddress(), signDesc.SingleTweak,
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signDesc.DoubleTweak)
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if privKey == nil {
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return nil, fmt.Errorf("Mock signer does not have key for "+
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"address %v", addresses[0])
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}
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witnessScript, err := txscript.WitnessSignature(tx, signDesc.SigHashes,
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signDesc.InputIndex, signDesc.Output.Value,
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signDesc.Output.PkScript, txscript.SigHashAll, privKey, true)
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if err != nil {
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return nil, err
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}
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return &InputScript{Witness: witnessScript}, nil
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default:
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return nil, fmt.Errorf("Unexpected script type: %v", scriptType)
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}
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}
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// findKey searches through all stored private keys and returns one
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// corresponding to the hashed pubkey if it can be found. The public key may
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// either correspond directly to the private key or to the private key with a
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// tweak applied.
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func (m *mockSigner) findKey(needleHash160 []byte, singleTweak []byte,
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doubleTweak *btcec.PrivateKey) *btcec.PrivateKey {
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for _, privkey := range m.privkeys {
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// First check whether public key is directly derived from private key.
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hash160 := btcutil.Hash160(privkey.PubKey().SerializeCompressed())
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if bytes.Equal(hash160, needleHash160) {
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return privkey
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}
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// Otherwise check if public key is derived from tweaked private key.
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switch {
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case singleTweak != nil:
|
|
privkey = TweakPrivKey(privkey, singleTweak)
|
|
case doubleTweak != nil:
|
|
privkey = DeriveRevocationPrivKey(privkey, doubleTweak)
|
|
default:
|
|
continue
|
|
}
|
|
hash160 = btcutil.Hash160(privkey.PubKey().SerializeCompressed())
|
|
if bytes.Equal(hash160, needleHash160) {
|
|
return privkey
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
type mockPreimageCache struct {
|
|
sync.Mutex
|
|
preimageMap map[[32]byte][]byte
|
|
}
|
|
|
|
func (m *mockPreimageCache) LookupPreimage(hash []byte) ([]byte, bool) {
|
|
m.Lock()
|
|
defer m.Unlock()
|
|
|
|
var h [32]byte
|
|
copy(h[:], hash)
|
|
|
|
p, ok := m.preimageMap[h]
|
|
return p, ok
|
|
}
|
|
|
|
func (m *mockPreimageCache) AddPreimage(preimage []byte) error {
|
|
m.Lock()
|
|
defer m.Unlock()
|
|
|
|
m.preimageMap[sha256.Sum256(preimage[:])] = preimage
|
|
|
|
return nil
|
|
}
|
|
|
|
// pubkeyFromHex parses a Bitcoin public key from a hex encoded string.
|
|
func pubkeyFromHex(keyHex string) (*btcec.PublicKey, error) {
|
|
bytes, err := hex.DecodeString(keyHex)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return btcec.ParsePubKey(bytes, btcec.S256())
|
|
}
|
|
|
|
// privkeyFromHex parses a Bitcoin private key from a hex encoded string.
|
|
func privkeyFromHex(keyHex string) (*btcec.PrivateKey, error) {
|
|
bytes, err := hex.DecodeString(keyHex)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
key, _ := btcec.PrivKeyFromBytes(btcec.S256(), bytes)
|
|
return key, nil
|
|
|
|
}
|
|
|
|
// pubkeyToHex serializes a Bitcoin public key to a hex encoded string.
|
|
func pubkeyToHex(key *btcec.PublicKey) string {
|
|
return hex.EncodeToString(key.SerializeCompressed())
|
|
}
|
|
|
|
// privkeyFromHex serializes a Bitcoin private key to a hex encoded string.
|
|
func privkeyToHex(key *btcec.PrivateKey) string {
|
|
return hex.EncodeToString(key.Serialize())
|
|
}
|
|
|
|
// signatureFromHex parses a Bitcoin signature from a hex encoded string.
|
|
func signatureFromHex(sigHex string) (*btcec.Signature, error) {
|
|
bytes, err := hex.DecodeString(sigHex)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return btcec.ParseSignature(bytes, btcec.S256())
|
|
}
|
|
|
|
// blockFromHex parses a full Bitcoin block from a hex encoded string.
|
|
func blockFromHex(blockHex string) (*btcutil.Block, error) {
|
|
bytes, err := hex.DecodeString(blockHex)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return btcutil.NewBlockFromBytes(bytes)
|
|
}
|
|
|
|
// txFromHex parses a full Bitcoin transaction from a hex encoded string.
|
|
func txFromHex(txHex string) (*btcutil.Tx, error) {
|
|
bytes, err := hex.DecodeString(txHex)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return btcutil.NewTxFromBytes(bytes)
|
|
}
|
|
|
|
// calcStaticFee calculates appropriate fees for commitment transactions. This
|
|
// function provides a simple way to allow test balance assertions to take fee
|
|
// calculations into account.
|
|
//
|
|
// TODO(bvu): Refactor when dynamic fee estimation is added.
|
|
func calcStaticFee(numHTLCs int) btcutil.Amount {
|
|
const (
|
|
commitWeight = btcutil.Amount(724)
|
|
htlcWeight = 172
|
|
feePerKw = btcutil.Amount(24/4) * 1000
|
|
)
|
|
return feePerKw * (commitWeight +
|
|
btcutil.Amount(htlcWeight*numHTLCs)) / 1000
|
|
}
|