777ed104a3
In this commit, we create a new chainfee package, that houses all fee related functionality used within the codebase. The creation of this new package furthers our long-term goal of extracting functionality from the bloated `lnwallet` package into new distinct packages. Additionally, this new packages resolves a class of import cycle that could arise if a new package that was imported by something in `lnwallet` wanted to use the existing fee related functions in the prior `lnwallet` package.
639 lines
20 KiB
Go
639 lines
20 KiB
Go
package wtclient
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import (
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"bytes"
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"crypto/rand"
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"io"
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"reflect"
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"testing"
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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/txscript"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil"
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"github.com/davecgh/go-spew/spew"
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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/lnwallet/chainfee"
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"github.com/lightningnetwork/lnd/lnwire"
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"github.com/lightningnetwork/lnd/watchtower/blob"
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"github.com/lightningnetwork/lnd/watchtower/wtdb"
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"github.com/lightningnetwork/lnd/watchtower/wtmock"
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"github.com/lightningnetwork/lnd/watchtower/wtpolicy"
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)
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const csvDelay uint32 = 144
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var (
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zeroPK [33]byte
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zeroSig [64]byte
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revPrivBytes = []byte{
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0x8f, 0x4b, 0x51, 0x83, 0xa9, 0x34, 0xbd, 0x5f,
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0x74, 0x6c, 0x9d, 0x5c, 0xae, 0x88, 0x2d, 0x31,
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0x06, 0x90, 0xdd, 0x8c, 0x9b, 0x31, 0xbc, 0xd1,
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0x78, 0x91, 0x88, 0x2a, 0xf9, 0x74, 0xa0, 0xef,
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}
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toLocalPrivBytes = []byte{
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0xde, 0x17, 0xc1, 0x2f, 0xdc, 0x1b, 0xc0, 0xc6,
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0x59, 0x5d, 0xf9, 0xc1, 0x3e, 0x89, 0xbc, 0x6f,
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0x01, 0x85, 0x45, 0x76, 0x26, 0xce, 0x9c, 0x55,
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0x3b, 0xc9, 0xec, 0x3d, 0xd8, 0x8b, 0xac, 0xa8,
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}
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toRemotePrivBytes = []byte{
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0x28, 0x59, 0x6f, 0x36, 0xb8, 0x9f, 0x19, 0x5d,
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0xcb, 0x07, 0x48, 0x8a, 0xe5, 0x89, 0x71, 0x74,
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0x70, 0x4c, 0xff, 0x1e, 0x9c, 0x00, 0x93, 0xbe,
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0xe2, 0x2e, 0x68, 0x08, 0x4c, 0xb4, 0x0f, 0x4f,
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}
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)
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func makeAddrSlice(size int) []byte {
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addr := make([]byte, size)
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if _, err := io.ReadFull(rand.Reader, addr); err != nil {
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panic("cannot make addr")
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}
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return addr
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}
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type backupTaskTest struct {
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name string
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chanID lnwire.ChannelID
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breachInfo *lnwallet.BreachRetribution
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expToLocalInput input.Input
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expToRemoteInput input.Input
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expTotalAmt btcutil.Amount
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expSweepAmt int64
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expRewardAmt int64
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expRewardScript []byte
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session *wtdb.ClientSessionBody
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bindErr error
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expSweepScript []byte
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signer input.Signer
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tweakless bool
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}
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// genTaskTest creates a instance of a backupTaskTest using the passed
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// parameters. This method handles generating a breach transaction and its
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// corresponding BreachInfo, as well as setting the wtpolicy.Policy of the given
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// session.
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func genTaskTest(
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name string,
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stateNum uint64,
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toLocalAmt int64,
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toRemoteAmt int64,
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blobType blob.Type,
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sweepFeeRate chainfee.SatPerKWeight,
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rewardScript []byte,
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expSweepAmt int64,
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expRewardAmt int64,
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bindErr error,
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tweakless bool) backupTaskTest {
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// Parse the key pairs for all keys used in the test.
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revSK, revPK := btcec.PrivKeyFromBytes(
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btcec.S256(), revPrivBytes,
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)
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_, toLocalPK := btcec.PrivKeyFromBytes(
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btcec.S256(), toLocalPrivBytes,
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)
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toRemoteSK, toRemotePK := btcec.PrivKeyFromBytes(
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btcec.S256(), toRemotePrivBytes,
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)
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// Create the signer, and add the revocation and to-remote privkeys.
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signer := wtmock.NewMockSigner()
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var (
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revKeyLoc = signer.AddPrivKey(revSK)
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toRemoteKeyLoc = signer.AddPrivKey(toRemoteSK)
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)
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// First, we'll initialize a new breach transaction and the
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// corresponding breach retribution. The retribution stores a pointer to
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// the breach transaction, which we will continue to modify.
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breachTxn := wire.NewMsgTx(2)
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breachInfo := &lnwallet.BreachRetribution{
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RevokedStateNum: stateNum,
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BreachTransaction: breachTxn,
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KeyRing: &lnwallet.CommitmentKeyRing{
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RevocationKey: revPK,
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DelayKey: toLocalPK,
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NoDelayKey: toRemotePK,
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},
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RemoteDelay: csvDelay,
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}
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// Add the sign descriptors and outputs corresponding to the to-local
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// and to-remote outputs, respectively, if either input amount is
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// non-zero. Note that the naming here seems reversed, but both are
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// correct. For example, the to-remote output on the remote party's
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// commitment is an output that pays to us. Hence the retribution refers
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// to that output as local, though relative to their commitment, it is
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// paying to-the-remote party (which is us).
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if toLocalAmt > 0 {
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toLocalSignDesc := &input.SignDescriptor{
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KeyDesc: keychain.KeyDescriptor{
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KeyLocator: revKeyLoc,
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PubKey: revPK,
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},
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Output: &wire.TxOut{
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Value: toLocalAmt,
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},
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HashType: txscript.SigHashAll,
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}
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breachInfo.RemoteOutputSignDesc = toLocalSignDesc
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breachTxn.AddTxOut(toLocalSignDesc.Output)
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}
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if toRemoteAmt > 0 {
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toRemoteSignDesc := &input.SignDescriptor{
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KeyDesc: keychain.KeyDescriptor{
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KeyLocator: toRemoteKeyLoc,
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PubKey: toRemotePK,
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},
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Output: &wire.TxOut{
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Value: toRemoteAmt,
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},
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HashType: txscript.SigHashAll,
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}
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breachInfo.LocalOutputSignDesc = toRemoteSignDesc
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breachTxn.AddTxOut(toRemoteSignDesc.Output)
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}
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var (
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toLocalInput input.Input
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toRemoteInput input.Input
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)
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// Now that the breach transaction has all its outputs, we can compute
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// its txid and inputs spending from it. We also generate the
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// input.Inputs that should be derived by the backup task.
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txid := breachTxn.TxHash()
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var index uint32
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if toLocalAmt > 0 {
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breachInfo.RemoteOutpoint = wire.OutPoint{
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Hash: txid,
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Index: index,
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}
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toLocalInput = input.NewBaseInput(
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&breachInfo.RemoteOutpoint,
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input.CommitmentRevoke,
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breachInfo.RemoteOutputSignDesc,
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0,
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)
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index++
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}
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if toRemoteAmt > 0 {
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breachInfo.LocalOutpoint = wire.OutPoint{
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Hash: txid,
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Index: index,
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}
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witnessType := input.CommitmentNoDelay
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if tweakless {
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witnessType = input.CommitSpendNoDelayTweakless
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}
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toRemoteInput = input.NewBaseInput(
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&breachInfo.LocalOutpoint,
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witnessType,
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breachInfo.LocalOutputSignDesc,
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0,
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)
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}
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return backupTaskTest{
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name: name,
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breachInfo: breachInfo,
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expToLocalInput: toLocalInput,
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expToRemoteInput: toRemoteInput,
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expTotalAmt: btcutil.Amount(toLocalAmt + toRemoteAmt),
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expSweepAmt: expSweepAmt,
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expRewardAmt: expRewardAmt,
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expRewardScript: rewardScript,
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session: &wtdb.ClientSessionBody{
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Policy: wtpolicy.Policy{
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TxPolicy: wtpolicy.TxPolicy{
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BlobType: blobType,
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SweepFeeRate: sweepFeeRate,
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RewardRate: 10000,
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},
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},
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RewardPkScript: rewardScript,
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},
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bindErr: bindErr,
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expSweepScript: makeAddrSlice(22),
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signer: signer,
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tweakless: tweakless,
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}
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}
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var (
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blobTypeCommitNoReward = blob.FlagCommitOutputs.Type()
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blobTypeCommitReward = (blob.FlagCommitOutputs | blob.FlagReward).Type()
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addr, _ = btcutil.DecodeAddress(
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"mrX9vMRYLfVy1BnZbc5gZjuyaqH3ZW2ZHz", &chaincfg.TestNet3Params,
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)
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addrScript, _ = txscript.PayToAddrScript(addr)
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)
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// TestBackupTaskBind tests the initialization and binding of a backupTask to a
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// ClientSession. After a successful bind, all parameters of the justice
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// transaction should be solidified, so we assert there correctness. In an
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// unsuccessful bind, the session-dependent parameters should be unmodified so
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// that the backup task can be rescheduled if necessary. Finally, we assert that
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// the backup task is able to encrypt a valid justice kit, and that we can
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// decrypt it using the breach txid.
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func TestBackupTask(t *testing.T) {
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t.Parallel()
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var backupTaskTests []backupTaskTest
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for _, tweakless := range []bool{true, false} {
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backupTaskTests = append(backupTaskTests, []backupTaskTest{
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genTaskTest(
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"commit no-reward, both outputs",
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100, // stateNum
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200000, // toLocalAmt
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100000, // toRemoteAmt
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blobTypeCommitNoReward, // blobType
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1000, // sweepFeeRate
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nil, // rewardScript
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299241, // expSweepAmt
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0, // expRewardAmt
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nil, // bindErr
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tweakless,
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),
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genTaskTest(
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"commit no-reward, to-local output only",
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1000, // stateNum
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200000, // toLocalAmt
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0, // toRemoteAmt
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blobTypeCommitNoReward, // blobType
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1000, // sweepFeeRate
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nil, // rewardScript
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199514, // expSweepAmt
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0, // expRewardAmt
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nil, // bindErr
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tweakless,
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),
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genTaskTest(
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"commit no-reward, to-remote output only",
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1, // stateNum
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0, // toLocalAmt
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100000, // toRemoteAmt
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blobTypeCommitNoReward, // blobType
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1000, // sweepFeeRate
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nil, // rewardScript
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99561, // expSweepAmt
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0, // expRewardAmt
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nil, // bindErr
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tweakless,
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),
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genTaskTest(
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"commit no-reward, to-remote output only, creates dust",
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1, // stateNum
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0, // toLocalAmt
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100000, // toRemoteAmt
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blobTypeCommitNoReward, // blobType
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227500, // sweepFeeRate
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nil, // rewardScript
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0, // expSweepAmt
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0, // expRewardAmt
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wtpolicy.ErrCreatesDust, // bindErr
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tweakless,
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),
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genTaskTest(
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"commit no-reward, no outputs, fee rate exceeds inputs",
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300, // stateNum
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0, // toLocalAmt
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0, // toRemoteAmt
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blobTypeCommitNoReward, // blobType
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1000, // sweepFeeRate
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nil, // rewardScript
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0, // expSweepAmt
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0, // expRewardAmt
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wtpolicy.ErrFeeExceedsInputs, // bindErr
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tweakless,
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),
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genTaskTest(
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"commit no-reward, no outputs, fee rate of 0 creates dust",
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300, // stateNum
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0, // toLocalAmt
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0, // toRemoteAmt
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blobTypeCommitNoReward, // blobType
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0, // sweepFeeRate
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nil, // rewardScript
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0, // expSweepAmt
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0, // expRewardAmt
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wtpolicy.ErrCreatesDust, // bindErr
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tweakless,
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),
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genTaskTest(
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"commit reward, both outputs",
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100, // stateNum
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200000, // toLocalAmt
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100000, // toRemoteAmt
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blobTypeCommitReward, // blobType
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1000, // sweepFeeRate
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addrScript, // rewardScript
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296117, // expSweepAmt
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3000, // expRewardAmt
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nil, // bindErr
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tweakless,
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),
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genTaskTest(
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"commit reward, to-local output only",
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1000, // stateNum
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200000, // toLocalAmt
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0, // toRemoteAmt
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blobTypeCommitReward, // blobType
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1000, // sweepFeeRate
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addrScript, // rewardScript
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197390, // expSweepAmt
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2000, // expRewardAmt
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nil, // bindErr
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tweakless,
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),
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genTaskTest(
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"commit reward, to-remote output only",
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1, // stateNum
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0, // toLocalAmt
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100000, // toRemoteAmt
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blobTypeCommitReward, // blobType
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1000, // sweepFeeRate
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addrScript, // rewardScript
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98437, // expSweepAmt
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1000, // expRewardAmt
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nil, // bindErr
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tweakless,
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),
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genTaskTest(
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"commit reward, to-remote output only, creates dust",
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1, // stateNum
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0, // toLocalAmt
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100000, // toRemoteAmt
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blobTypeCommitReward, // blobType
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175000, // sweepFeeRate
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addrScript, // rewardScript
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0, // expSweepAmt
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0, // expRewardAmt
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wtpolicy.ErrCreatesDust, // bindErr
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tweakless,
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),
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genTaskTest(
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"commit reward, no outputs, fee rate exceeds inputs",
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300, // stateNum
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0, // toLocalAmt
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0, // toRemoteAmt
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blobTypeCommitReward, // blobType
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1000, // sweepFeeRate
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addrScript, // rewardScript
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0, // expSweepAmt
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0, // expRewardAmt
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wtpolicy.ErrFeeExceedsInputs, // bindErr
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tweakless,
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),
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genTaskTest(
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"commit reward, no outputs, fee rate of 0 creates dust",
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300, // stateNum
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0, // toLocalAmt
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0, // toRemoteAmt
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blobTypeCommitReward, // blobType
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0, // sweepFeeRate
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addrScript, // rewardScript
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0, // expSweepAmt
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0, // expRewardAmt
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wtpolicy.ErrCreatesDust, // bindErr
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tweakless,
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),
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}...)
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}
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for _, test := range backupTaskTests {
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test := test
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t.Run(test.name, func(t *testing.T) {
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t.Parallel()
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testBackupTask(t, test)
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})
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}
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}
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func testBackupTask(t *testing.T, test backupTaskTest) {
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// Create a new backupTask from the channel id and breach info.
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task := newBackupTask(
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&test.chanID, test.breachInfo, test.expSweepScript,
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test.tweakless,
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)
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// Assert that all parameters set during initialization are properly
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// populated.
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if task.id.ChanID != test.chanID {
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t.Fatalf("channel id mismatch, want: %s, got: %s",
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test.chanID, task.id.ChanID)
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}
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if task.id.CommitHeight != test.breachInfo.RevokedStateNum {
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t.Fatalf("commit height mismatch, want: %d, got: %d",
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test.breachInfo.RevokedStateNum, task.id.CommitHeight)
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}
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if task.totalAmt != test.expTotalAmt {
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t.Fatalf("total amount mismatch, want: %d, got: %v",
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test.expTotalAmt, task.totalAmt)
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}
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if !reflect.DeepEqual(task.breachInfo, test.breachInfo) {
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t.Fatalf("breach info mismatch, want: %v, got: %v",
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test.breachInfo, task.breachInfo)
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}
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if !reflect.DeepEqual(task.toLocalInput, test.expToLocalInput) {
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t.Fatalf("to-local input mismatch, want: %v, got: %v",
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test.expToLocalInput, task.toLocalInput)
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}
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if !reflect.DeepEqual(task.toRemoteInput, test.expToRemoteInput) {
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t.Fatalf("to-local input mismatch, want: %v, got: %v",
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test.expToRemoteInput, task.toRemoteInput)
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}
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// Reconstruct the expected input.Inputs that will be returned by the
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// task's inputs() method.
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expInputs := make(map[wire.OutPoint]input.Input)
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if task.toLocalInput != nil {
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expInputs[*task.toLocalInput.OutPoint()] = task.toLocalInput
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}
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if task.toRemoteInput != nil {
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expInputs[*task.toRemoteInput.OutPoint()] = task.toRemoteInput
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}
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// Assert that the inputs method returns the correct slice of
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// input.Inputs.
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inputs := task.inputs()
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if !reflect.DeepEqual(expInputs, inputs) {
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t.Fatalf("inputs mismatch, want: %v, got: %v",
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expInputs, inputs)
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}
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// Now, bind the session to the task. If successful, this locks in the
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// session's negotiated parameters and allows the backup task to derive
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// the final free variables in the justice transaction.
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err := task.bindSession(test.session)
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if err != test.bindErr {
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t.Fatalf("expected: %v when binding session, got: %v",
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test.bindErr, err)
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}
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// Exit early if the bind was supposed to fail. But first, we check that
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// all fields set during a bind are still unset. This ensure that a
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// failed bind doesn't have side-effects if the task is retried with a
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// different session.
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if test.bindErr != nil {
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|
if task.blobType != 0 {
|
|
t.Fatalf("blob type should not be set on failed bind, "+
|
|
"found: %s", task.blobType)
|
|
}
|
|
|
|
if task.outputs != nil {
|
|
t.Fatalf("justice outputs should not be set on failed bind, "+
|
|
"found: %v", task.outputs)
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// Otherwise, the binding succeeded. Assert that all values set during
|
|
// the bind are properly populated.
|
|
policy := test.session.Policy
|
|
if task.blobType != policy.BlobType {
|
|
t.Fatalf("blob type mismatch, want: %s, got %s",
|
|
policy.BlobType, task.blobType)
|
|
}
|
|
|
|
// Compute the expected outputs on the justice transaction.
|
|
var expOutputs = []*wire.TxOut{
|
|
{
|
|
PkScript: test.expSweepScript,
|
|
Value: test.expSweepAmt,
|
|
},
|
|
}
|
|
|
|
// If the policy specifies a reward output, add it to the expected list
|
|
// of outputs.
|
|
if test.session.Policy.BlobType.Has(blob.FlagReward) {
|
|
expOutputs = append(expOutputs, &wire.TxOut{
|
|
PkScript: test.expRewardScript,
|
|
Value: test.expRewardAmt,
|
|
})
|
|
}
|
|
|
|
// Assert that the computed outputs match our expected outputs.
|
|
if !reflect.DeepEqual(expOutputs, task.outputs) {
|
|
t.Fatalf("justice txn output mismatch, want: %v,\ngot: %v",
|
|
spew.Sdump(expOutputs), spew.Sdump(task.outputs))
|
|
}
|
|
|
|
// Now, we'll construct, sign, and encrypt the blob containing the parts
|
|
// needed to reconstruct the justice transaction.
|
|
hint, encBlob, err := task.craftSessionPayload(test.signer)
|
|
if err != nil {
|
|
t.Fatalf("unable to craft session payload: %v", err)
|
|
}
|
|
|
|
// Verify that the breach hint matches the breach txid's prefix.
|
|
breachTxID := test.breachInfo.BreachTransaction.TxHash()
|
|
expHint := blob.NewBreachHintFromHash(&breachTxID)
|
|
if hint != expHint {
|
|
t.Fatalf("breach hint mismatch, want: %x, got: %v",
|
|
expHint, hint)
|
|
}
|
|
|
|
// Decrypt the return blob to obtain the JusticeKit containing its
|
|
// contents.
|
|
key := blob.NewBreachKeyFromHash(&breachTxID)
|
|
jKit, err := blob.Decrypt(key, encBlob, policy.BlobType)
|
|
if err != nil {
|
|
t.Fatalf("unable to decrypt blob: %v", err)
|
|
}
|
|
|
|
keyRing := test.breachInfo.KeyRing
|
|
expToLocalPK := keyRing.DelayKey.SerializeCompressed()
|
|
expRevPK := keyRing.RevocationKey.SerializeCompressed()
|
|
expToRemotePK := keyRing.NoDelayKey.SerializeCompressed()
|
|
|
|
// Assert that the blob contained the serialized revocation and to-local
|
|
// pubkeys.
|
|
if !bytes.Equal(jKit.RevocationPubKey[:], expRevPK) {
|
|
t.Fatalf("revocation pk mismatch, want: %x, got: %x",
|
|
expRevPK, jKit.RevocationPubKey[:])
|
|
}
|
|
if !bytes.Equal(jKit.LocalDelayPubKey[:], expToLocalPK) {
|
|
t.Fatalf("revocation pk mismatch, want: %x, got: %x",
|
|
expToLocalPK, jKit.LocalDelayPubKey[:])
|
|
}
|
|
|
|
// Determine if the breach transaction has a to-remote output and/or
|
|
// to-local output to spend from. Note the seemingly-reversed
|
|
// nomenclature.
|
|
hasToRemote := test.breachInfo.LocalOutputSignDesc != nil
|
|
hasToLocal := test.breachInfo.RemoteOutputSignDesc != nil
|
|
|
|
// If the to-remote output is present, assert that the to-remote public
|
|
// key was included in the blob.
|
|
if hasToRemote &&
|
|
!bytes.Equal(jKit.CommitToRemotePubKey[:], expToRemotePK) {
|
|
t.Fatalf("mismatch to-remote pubkey, want: %x, got: %x",
|
|
expToRemotePK, jKit.CommitToRemotePubKey)
|
|
}
|
|
|
|
// Otherwise if the to-local output is not present, assert that a blank
|
|
// public key was inserted.
|
|
if !hasToRemote &&
|
|
!bytes.Equal(jKit.CommitToRemotePubKey[:], zeroPK[:]) {
|
|
t.Fatalf("mismatch to-remote pubkey, want: %x, got: %x",
|
|
zeroPK, jKit.CommitToRemotePubKey)
|
|
}
|
|
|
|
// Assert that the CSV is encoded in the blob.
|
|
if jKit.CSVDelay != test.breachInfo.RemoteDelay {
|
|
t.Fatalf("mismatch remote delay, want: %d, got: %v",
|
|
test.breachInfo.RemoteDelay, jKit.CSVDelay)
|
|
}
|
|
|
|
// Assert that the sweep pkscript is included.
|
|
if !bytes.Equal(jKit.SweepAddress, test.expSweepScript) {
|
|
t.Fatalf("sweep pkscript mismatch, want: %x, got: %x",
|
|
test.expSweepScript, jKit.SweepAddress)
|
|
}
|
|
|
|
// Finally, verify that the signatures are encoded in the justice kit.
|
|
// We don't validate the actual signatures produced here, since at the
|
|
// moment, it is tested indirectly by other packages and integration
|
|
// tests.
|
|
// TODO(conner): include signature validation checks
|
|
|
|
emptyToLocalSig := bytes.Equal(jKit.CommitToLocalSig[:], zeroSig[:])
|
|
switch {
|
|
case hasToLocal && emptyToLocalSig:
|
|
t.Fatalf("to-local signature should not be empty")
|
|
case !hasToLocal && !emptyToLocalSig:
|
|
t.Fatalf("to-local signature should be empty")
|
|
}
|
|
|
|
emptyToRemoteSig := bytes.Equal(jKit.CommitToRemoteSig[:], zeroSig[:])
|
|
switch {
|
|
case hasToRemote && emptyToRemoteSig:
|
|
t.Fatalf("to-remote signature should not be empty")
|
|
case !hasToRemote && !emptyToRemoteSig:
|
|
t.Fatalf("to-remote signature should be empty")
|
|
}
|
|
}
|