lnwire+netann: update structure of g175 messages to be pure TLV #9175

ellemouton · 2024-10-11T14:42:39Z

Update the structure of all gossip 1.75 messages to be purely TLV.
With this update, the signature is also a TLV record. There is a un-signed
and signed range of TLVs. The signature along with things like SPV proofs
will fall in the un-signed range.
I've used the same un-signed range used by Bolt12 messages.

This PR introduces a new PureTLVMessage interface for messages like this
and adds a comprehensive test to ensure that old clients (who are aware of
fewer fields of a message than new clients) and new clients still generate the
same correct digest of a message regardless of if they are aware of all the
records or not.

Bonus Commit

Ok i've also now updated this PR to include validating the signature of a
ChannelAnnouncement2 message for the case where it is announcing a P2WSH channel.

ellemouton · 2024-10-16T11:26:17Z

Ok i've also now updated this PR to include validating the signature of a
ChannelAnnouncement2 message for the case where it is announcing a P2WSH channel.

go.mod

lnwire/pure_tlv.go

Roasbeef · 2024-10-16T22:44:52Z

lnwire/pure_tlv.go

+const (
+	pureTLVUnsignedRangeOneStart  = 160
+	pureTLVSignedSecondRangeStart = 1000000000
+	pureTLVUnsignedRangeTwoStart  = 3000000000


How did we arrive at these values?

Also I think we should try to capture this in the spec, independent of G 1.75.

How did we arrive at these values?

Stole from Bolt12

Also I think we should try to capture this in the spec, independent of G 1.75.

Agreed - however it is currently in bolt12. I'll update the G157 spec PR so that it moves the definition to a more "shared" location (like BOLT 1)

Roasbeef · 2024-10-16T22:46:52Z

lnwire/pure_tlv.go

+
+// SerialiseFieldsToSign serialises all the records from the given
+// PureTLVMessage that fall within the signed TLV range.
+func SerialiseFieldsToSign(msg PureTLVMessage) ([]byte, error) {


We might want to adopt a similar structure for the signed portion of the dyn commit messages @ProofOfKeags. Basically we copied over from the way BOLT 12 works, and we can use the TLV type values, then let this handle how serialization works (does require a message to be pure TLV).

Roasbeef · 2024-10-16T22:50:36Z

lnwire/pure_tlv_test.go

+	// Any extra fields in the signed range that we do not yet know about,
+	// but we need to keep them for signature validation and to produce a
+	// valid message.
+	ExtraFieldsInSignedRange map[uint64][]byte


Should something like this be split out into an embeddable struct?

updated to be an embedded struct - let me know if this is what you had in mind

Roasbeef · 2024-10-16T22:54:27Z

lnwire/announcement_signatures_2.go

+	// Any extra fields in the signed range that we do not yet know about,
+	// but we need to keep them for signature validation and to produce a
+	// valid message.
+	ExtraFieldsInSignedRange map[uint64][]byte


Also why can't we just continue to store it in the serialized form?

Feels like unnecessary duplication? All the fields we know of, we explicitly handle above. Then this only contains all the other fields in the unsigned range that we need to keep. Just feels more structured to me. This pure tlv structure with unsigned and signed ranges feels fundamentally different to me than the previous usage of TLV which is purely tacked on the the end of a message and we always needed to keep the whole thing since the signature covers everything.

Happy to discuss further!

Roasbeef · 2024-10-16T22:54:56Z

discovery/gossiper.go

+	// AuthenticatedGossiper. Any announcements that don't match this
+	// chain hash will be ignored. This is an internal config value obtained
+	// from ChainParams.
+	chainHash *chainhash.Hash


Why do we need it here if we have ChainParams?

just had it there as a helper so that we dont need to do cfg.ChainParams.GenesisHash everytime.... but happy to remove

Roasbeef · 2024-10-16T22:55:02Z

discovery/gossiper.go

-	ChainHash chainhash.Hash
+	// ChainParams holds the chain parameters for the active network this
+	// node is participating on.
+	ChainParams *chaincfg.Params


I think this can be a normal value rather than a pointer.

wont it copy over struct values then though?

Roasbeef · 2024-10-16T22:55:38Z

discovery/gossiper.go

-	[]byte, error) {
+	txscript.ScriptClass, btcutil.Address, error) {
+
+	pkScript, err := lnwallet.FetchPKScriptWithQuit(


What about the merkle proof case?

that wont be supported from the get go. That will be a separate feature bit

Roasbeef · 2024-10-16T22:55:56Z

netann/channel_announcement.go

@@ -108,7 +110,8 @@ func CreateChanAnnouncement(chanProof *models.ChannelAuthProof,

 // FetchPkScript defines a function that can be used to fetch the output script
 // for the transaction with the given SCID.
-type FetchPkScript func(*lnwire.ShortChannelID) ([]byte, error)
+type FetchPkScript func(*lnwire.ShortChannelID) (txscript.ScriptClass,


Does the arg here need to be a pointer?

else it is pass by value right?

lightninglabs-deploy · 2024-11-28T01:39:09Z

@ellemouton, remember to re-request review from reviewers when ready

coderabbitai · 2024-12-02T08:28:43Z

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PureTLVMessage describes an LN message that is a pure TLV stream. If the message includes a signature, it will sign all the TLV records in the inclusive ranges: 0 to 159 and 1000000000 to 2999999999. A comprehensive test is added that shows how two versions of the same message remain forward compatible.

So that we can use it as a TLV record type.

Such that all fields are now TLV (including the signature).

such that all fields are now TLV including the signature.

This commit expands the ChannelAnnouncement2 validation for the case where it is announcing a P2WSH channel.

ellemouton self-assigned this Oct 11, 2024

ellemouton added the gossip label Oct 11, 2024

ellemouton force-pushed the g175UpdateMessageStructure branch 3 times, most recently from 4160fd5 to 5d3c965 Compare October 16, 2024 11:24

ellemouton force-pushed the g175UpdateMessageStructure branch from 5d3c965 to 6f0ce3b Compare October 16, 2024 11:39

Roasbeef requested changes Oct 16, 2024

View reviewed changes

ellemouton force-pushed the g175UpdateMessageStructure branch from 6f0ce3b to 5e509ab Compare December 2, 2024 08:28

go.mod: update TLV package dep

4d46b5c

ellemouton force-pushed the g175UpdateMessageStructure branch from 5e509ab to f9b6397 Compare December 2, 2024 09:11

ellemouton added 6 commits December 2, 2024 12:49

lnwire: let ChannelID implement RecordProducer

db76d0b

So that we can use it as a TLV record type.

lnwire+netann: update ChannelAnnouncement2 structure

1ffd3b2

Such that all fields are now TLV (including the signature).

lnwire+netann: update ChannelUpdate2

34afb59

such that all fields are now TLV including the signature.

lnwire: update AnnounceSigs2 to use pure TLV

fc40b72

netann: update ChanAnn2 validation to work for P2WSH channels

9d67b34

This commit expands the ChannelAnnouncement2 validation for the case where it is announcing a P2WSH channel.

ellemouton force-pushed the g175UpdateMessageStructure branch from f9b6397 to 72d8784 Compare December 2, 2024 10:49

lnwire: add NodeAnnouncement2

53bdf65

ellemouton force-pushed the g175UpdateMessageStructure branch from 72d8784 to 53bdf65 Compare December 2, 2024 11:25

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lnwire+netann: update structure of g175 messages to be pure TLV #9175

lnwire+netann: update structure of g175 messages to be pure TLV #9175

ellemouton commented Oct 11, 2024 •

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ellemouton commented Oct 11, 2024 • edited Loading

Bonus Commit

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