mirror of
https://github.com/aljazceru/breez-lnd.git
synced 2025-12-17 22:24:21 +01:00
b399203e71
In this commit, we update the channel state machine to be aware of tweakless commits. In several areas, we'll now check the channel's type to see if it's `SingleFunderTweakless`. If so, then we'll opt to use the remote party's non-delay based point directly in the script, skipping any additional cryptographic operations. Along the way we move the `validateCommitmentSanity` method to be defined _before_ it's used as is cutomary within the codebase. Notably, within the `NewUnilateralCloseSummary` method, we'll now _blank out_ the `SingleTweak` value if the commitment is tweakless. This indicates to callers the witness type they should map to, as the value isn't needed at all any longer when sweeping a non-delay output. We also update the signing+verification tests to also test that we're able to properly generate a valid witness for the new tweakless commitment format.
442 lines
12 KiB
Go
442 lines
12 KiB
Go
package lnd
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import (
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"bytes"
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crand "crypto/rand"
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"encoding/binary"
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"io"
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"io/ioutil"
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"math/rand"
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"net"
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"os"
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"time"
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"github.com/btcsuite/btcd/btcec"
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"github.com/btcsuite/btcd/chaincfg/chainhash"
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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/chainntnfs"
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"github.com/lightningnetwork/lnd/channeldb"
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"github.com/lightningnetwork/lnd/contractcourt"
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"github.com/lightningnetwork/lnd/htlcswitch"
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"github.com/lightningnetwork/lnd/input"
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"github.com/lightningnetwork/lnd/keychain"
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"github.com/lightningnetwork/lnd/lnwallet"
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"github.com/lightningnetwork/lnd/lnwire"
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"github.com/lightningnetwork/lnd/netann"
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"github.com/lightningnetwork/lnd/shachain"
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"github.com/lightningnetwork/lnd/ticker"
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)
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var (
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alicesPrivKey = []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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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 = [32]byte{
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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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// Just use some arbitrary bytes as delivery script.
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dummyDeliveryScript = alicesPrivKey[:]
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// testTx is used as the default funding txn for single-funder channels.
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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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// createTestPeer creates a channel between two nodes, and returns a peer for
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// one of the nodes, together with the channel seen from both nodes.
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func createTestPeer(notifier chainntnfs.ChainNotifier,
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publTx chan *wire.MsgTx) (*peer, *lnwallet.LightningChannel,
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*lnwallet.LightningChannel, func(), error) {
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aliceKeyPriv, aliceKeyPub := btcec.PrivKeyFromBytes(btcec.S256(),
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alicesPrivKey)
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bobKeyPriv, bobKeyPub := btcec.PrivKeyFromBytes(btcec.S256(),
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bobsPrivKey)
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channelCapacity := btcutil.Amount(10 * 1e8)
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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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aliceCfg := channeldb.ChannelConfig{
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ChannelConstraints: channeldb.ChannelConstraints{
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DustLimit: aliceDustLimit,
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MaxPendingAmount: lnwire.MilliSatoshi(rand.Int63()),
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ChanReserve: btcutil.Amount(rand.Int63()),
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MinHTLC: lnwire.MilliSatoshi(rand.Int63()),
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MaxAcceptedHtlcs: uint16(rand.Int31()),
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CsvDelay: uint16(csvTimeoutAlice),
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},
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MultiSigKey: keychain.KeyDescriptor{
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PubKey: aliceKeyPub,
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},
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RevocationBasePoint: keychain.KeyDescriptor{
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PubKey: aliceKeyPub,
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},
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PaymentBasePoint: keychain.KeyDescriptor{
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PubKey: aliceKeyPub,
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},
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DelayBasePoint: keychain.KeyDescriptor{
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PubKey: aliceKeyPub,
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},
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HtlcBasePoint: keychain.KeyDescriptor{
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PubKey: aliceKeyPub,
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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.MilliSatoshi(rand.Int63()),
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ChanReserve: btcutil.Amount(rand.Int63()),
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MinHTLC: lnwire.MilliSatoshi(rand.Int63()),
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MaxAcceptedHtlcs: uint16(rand.Int31()),
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CsvDelay: uint16(csvTimeoutBob),
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},
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MultiSigKey: keychain.KeyDescriptor{
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PubKey: bobKeyPub,
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},
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RevocationBasePoint: keychain.KeyDescriptor{
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PubKey: bobKeyPub,
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},
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PaymentBasePoint: keychain.KeyDescriptor{
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PubKey: bobKeyPub,
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},
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DelayBasePoint: keychain.KeyDescriptor{
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PubKey: bobKeyPub,
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},
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HtlcBasePoint: keychain.KeyDescriptor{
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PubKey: bobKeyPub,
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},
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}
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bobRoot, err := chainhash.NewHash(bobKeyPriv.Serialize())
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if err != nil {
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return nil, 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, nil, err
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}
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bobCommitPoint := input.ComputeCommitmentPoint(bobFirstRevoke[:])
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aliceRoot, err := chainhash.NewHash(aliceKeyPriv.Serialize())
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if err != nil {
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return nil, 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, nil, err
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}
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aliceCommitPoint := input.ComputeCommitmentPoint(aliceFirstRevoke[:])
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aliceCommitTx, bobCommitTx, err := lnwallet.CreateCommitmentTxns(
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channelBal, channelBal, &aliceCfg, &bobCfg, aliceCommitPoint,
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bobCommitPoint, *fundingTxIn, true,
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)
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if err != nil {
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return nil, nil, nil, nil, err
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}
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alicePath, err := ioutil.TempDir("", "alicedb")
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if err != nil {
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return nil, nil, nil, nil, err
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}
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dbAlice, err := channeldb.Open(alicePath)
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if err != nil {
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return nil, nil, nil, nil, err
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}
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bobPath, err := ioutil.TempDir("", "bobdb")
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if err != nil {
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return nil, nil, nil, nil, err
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}
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dbBob, err := channeldb.Open(bobPath)
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if err != nil {
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return nil, nil, nil, nil, err
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}
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estimator := lnwallet.NewStaticFeeEstimator(12500, 0)
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feePerKw, err := estimator.EstimateFeePerKW(1)
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if err != nil {
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return nil, nil, nil, nil, err
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}
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// TODO(roasbeef): need to factor in commit fee?
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aliceCommit := channeldb.ChannelCommitment{
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CommitHeight: 0,
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LocalBalance: lnwire.NewMSatFromSatoshis(channelBal),
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RemoteBalance: lnwire.NewMSatFromSatoshis(channelBal),
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FeePerKw: btcutil.Amount(feePerKw),
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CommitFee: feePerKw.FeeForWeight(input.CommitWeight),
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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),
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FeePerKw: btcutil.Amount(feePerKw),
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CommitFee: feePerKw.FeeForWeight(input.CommitWeight),
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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(crand.Reader, chanIDBytes[:]); err != nil {
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return nil, 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: aliceKeyPub,
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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: bobKeyPub,
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FundingOutpoint: *prevOut,
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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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aliceAddr := &net.TCPAddr{
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IP: net.ParseIP("127.0.0.1"),
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Port: 18555,
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}
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if err := aliceChannelState.SyncPending(aliceAddr, 0); err != nil {
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return nil, nil, nil, nil, err
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}
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bobAddr := &net.TCPAddr{
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IP: net.ParseIP("127.0.0.1"),
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Port: 18556,
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}
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if err := bobChannelState.SyncPending(bobAddr, 0); err != nil {
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return nil, 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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}
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aliceSigner := &mockSigner{aliceKeyPriv}
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bobSigner := &mockSigner{bobKeyPriv}
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alicePool := lnwallet.NewSigPool(1, aliceSigner)
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channelAlice, err := lnwallet.NewLightningChannel(
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aliceSigner, aliceChannelState, alicePool,
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)
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if err != nil {
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return nil, nil, nil, nil, err
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}
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alicePool.Start()
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bobPool := lnwallet.NewSigPool(1, bobSigner)
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channelBob, err := lnwallet.NewLightningChannel(
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bobSigner, bobChannelState, bobPool,
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)
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if err != nil {
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return nil, nil, nil, nil, err
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}
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bobPool.Start()
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chainIO := &mockChainIO{
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bestHeight: fundingBroadcastHeight,
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}
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wallet := &lnwallet.LightningWallet{
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WalletController: &mockWalletController{
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rootKey: aliceKeyPriv,
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publishedTransactions: publTx,
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},
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}
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cc := &chainControl{
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feeEstimator: estimator,
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chainIO: chainIO,
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chainNotifier: notifier,
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wallet: wallet,
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}
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breachArbiter := &breachArbiter{}
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chainArb := contractcourt.NewChainArbitrator(
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contractcourt.ChainArbitratorConfig{
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Notifier: notifier,
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ChainIO: chainIO,
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}, dbAlice,
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)
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chainArb.WatchNewChannel(aliceChannelState)
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s := &server{
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chanDB: dbAlice,
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cc: cc,
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breachArbiter: breachArbiter,
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chainArb: chainArb,
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}
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_, currentHeight, err := s.cc.chainIO.GetBestBlock()
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if err != nil {
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return nil, nil, nil, nil, err
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}
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htlcSwitch, err := htlcswitch.New(htlcswitch.Config{
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DB: dbAlice,
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SwitchPackager: channeldb.NewSwitchPackager(),
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Notifier: notifier,
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FwdEventTicker: ticker.New(
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htlcswitch.DefaultFwdEventInterval),
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LogEventTicker: ticker.New(
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htlcswitch.DefaultLogInterval),
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AckEventTicker: ticker.New(
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htlcswitch.DefaultAckInterval),
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}, uint32(currentHeight))
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if err != nil {
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return nil, nil, nil, nil, err
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}
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if err = htlcSwitch.Start(); err != nil {
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return nil, nil, nil, nil, err
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}
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s.htlcSwitch = htlcSwitch
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nodeSignerAlice := netann.NewNodeSigner(aliceKeyPriv)
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const chanActiveTimeout = time.Minute
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chanStatusMgr, err := netann.NewChanStatusManager(&netann.ChanStatusConfig{
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ChanStatusSampleInterval: 30 * time.Second,
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ChanEnableTimeout: chanActiveTimeout,
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ChanDisableTimeout: 2 * time.Minute,
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DB: dbAlice,
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Graph: dbAlice.ChannelGraph(),
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MessageSigner: nodeSignerAlice,
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OurPubKey: aliceKeyPub,
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IsChannelActive: s.htlcSwitch.HasActiveLink,
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ApplyChannelUpdate: func(*lnwire.ChannelUpdate) error { return nil },
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})
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if err != nil {
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return nil, nil, nil, nil, err
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}
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if err = chanStatusMgr.Start(); err != nil {
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return nil, nil, nil, nil, err
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}
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s.chanStatusMgr = chanStatusMgr
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alicePeer := &peer{
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addr: &lnwire.NetAddress{
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IdentityKey: aliceKeyPub,
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Address: aliceAddr,
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},
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server: s,
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sendQueue: make(chan outgoingMsg, 1),
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outgoingQueue: make(chan outgoingMsg, outgoingQueueLen),
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activeChannels: make(map[lnwire.ChannelID]*lnwallet.LightningChannel),
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newChannels: make(chan *newChannelMsg, 1),
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activeChanCloses: make(map[lnwire.ChannelID]*channelCloser),
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localCloseChanReqs: make(chan *htlcswitch.ChanClose),
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chanCloseMsgs: make(chan *closeMsg),
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chanActiveTimeout: chanActiveTimeout,
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queueQuit: make(chan struct{}),
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quit: make(chan struct{}),
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}
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chanID := lnwire.NewChanIDFromOutPoint(channelAlice.ChannelPoint())
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alicePeer.activeChannels[chanID] = channelAlice
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alicePeer.wg.Add(1)
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go alicePeer.channelManager()
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return alicePeer, channelAlice, channelBob, cleanUpFunc, nil
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}
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