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lnwallet: export ValidateUpfrontShutdown and restrict allowed addrs

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In this commit, we catch up our logic with the latest version of the
spec that removed support for normal p2kh and p2sh addresses for co-op
closes, in order to make dust calculations more uniform.
This commit is contained in:
Olaoluwa Osuntokun 2022-06-10 11:16:02 -07:00
parent 5f9c1b902f
commit c79ffc07ce
No known key found for this signature in database
GPG Key ID: 3BBD59E99B280306
1 changed files with 26 additions and 13 deletions
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39
lnwallet/wallet.go
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@ -1329,7 +1329,7 @@ func (l *LightningWallet) handleContributionMsg(req *addContributionMsg) {
shutdown := req.contribution.UpfrontShutdown
if len(shutdown) > 0 {
// Validate the shutdown script.
if !validateUpfrontShutdown(shutdown, &l.Cfg.NetParams) {
if !ValidateUpfrontShutdown(shutdown, &l.Cfg.NetParams) {
req.err <- fmt.Errorf("invalid shutdown script")
return
}
@ -1660,7 +1660,7 @@ func (l *LightningWallet) handleSingleContribution(req *addSingleContributionMsg
shutdown := req.contribution.UpfrontShutdown
if len(shutdown) > 0 {
// Validate the shutdown script.
if !validateUpfrontShutdown(shutdown, &l.Cfg.NetParams) {
if !ValidateUpfrontShutdown(shutdown, &l.Cfg.NetParams) {
req.err <- fmt.Errorf("invalid shutdown script")
return
}
@ -2087,8 +2087,8 @@ func (l *LightningWallet) WithCoinSelectLock(f func() error) error {
// state hints from the root to be used for a new channel. The obfuscator is
// generated via the following computation:
//
// * sha256(initiatorKey || responderKey)[26:]
// * where both keys are the multi-sig keys of the respective parties
// - sha256(initiatorKey || responderKey)[26:]
// -- where both keys are the multi-sig keys of the respective parties
//
// The first 6 bytes of the resulting hash are used as the state hint.
func DeriveStateHintObfuscator(key1, key2 *btcec.PublicKey) [StateHintSize]byte {
@ -2254,24 +2254,37 @@ func (s *shimKeyRing) DeriveNextKey(keyFam keychain.KeyFamily) (keychain.KeyDesc
return *fundingKeys.LocalKey, nil
}
// validateUpfrontShutdown checks whether the provided upfront_shutdown_script
// ValidateUpfrontShutdown checks whether the provided upfront_shutdown_script
// is of a valid type that we accept.
func validateUpfrontShutdown(shutdown lnwire.DeliveryAddress,
func ValidateUpfrontShutdown(shutdown lnwire.DeliveryAddress,
params *chaincfg.Params) bool {
// We don't need to worry about a large UpfrontShutdownScript since it
// was already checked in lnwire when decoding from the wire.
scriptClass, _, _, _ := txscript.ExtractPkScriptAddrs(shutdown, params)
switch scriptClass {
case txscript.PubKeyHashTy,
txscript.WitnessV0PubKeyHashTy,
txscript.ScriptHashTy,
txscript.WitnessV0ScriptHashTy:
// The above four types are permitted according to BOLT#02.
// Everything else is disallowed.
switch {
case scriptClass == txscript.WitnessV0PubKeyHashTy,
scriptClass == txscript.WitnessV0ScriptHashTy,
scriptClass == txscript.WitnessV1TaprootTy:
// The above three types are permitted according to BOLT#02 and
// BOLT#05. Everything else is disallowed.
return true
// In this case, we don't know about the actual script template, but it
// might be a witness program with versions 2-16. So we'll check that
// now
case txscript.IsWitnessProgram(shutdown):
version, _, err := txscript.ExtractWitnessProgramInfo(shutdown)
if err != nil {
walletLog.Warnf("unable to extract witness program "+
"version (script=%x): %v", shutdown, err)
return false
}
return version >= 1 && version <= 16
default:
return false
}