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Use one-hop blinded paths only for announced nodes

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To avoid exposing a node's identity in a blinded path, only create
one-hop blinded paths if the node has been announced, and thus has
public channels. Otherwise, there is no way to route a payment to the
node, exposing its identity needlessly.
This commit is contained in:
Jeffrey Czyz 2023-12-14 21:19:57 -06:00
parent 16ee24086c
commit 164c8553e5
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GPG Key ID: 3A4E08275D5E96D2
2 changed files with 15 additions and 7 deletions
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14
lightning/src/onion_message/messenger.rs
View File

@ -350,16 +350,16 @@ where
const MIN_PEER_CHANNELS: usize = 3;
let network_graph = self.network_graph.deref().read_only();
let paths = peers.into_iter()
let paths = peers.iter()
// Limit to peers with announced channels
.filter(|pubkey|
network_graph
.node(&NodeId::from_pubkey(&pubkey))
.node(&NodeId::from_pubkey(pubkey))
.map(|info| &info.channels[..])
.map(|channels| channels.len() >= MIN_PEER_CHANNELS)
.unwrap_or(false)
)
.map(|pubkey| vec![pubkey, recipient])
.map(|pubkey| vec![*pubkey, recipient])
.map(|node_pks| BlindedPath::new_for_message(&node_pks, entropy_source, secp_ctx))
.take(MAX_PATHS)
.collect::<Result<Vec<_>, _>>();
@ -367,8 +367,12 @@ where
match paths {
Ok(paths) if !paths.is_empty() => Ok(paths),
_ => {
BlindedPath::one_hop_for_message(recipient, entropy_source, secp_ctx)
.map(|path| vec![path])
if network_graph.nodes().contains_key(&NodeId::from_pubkey(&recipient)) {
BlindedPath::one_hop_for_message(recipient, entropy_source, secp_ctx)
.map(|path| vec![path])
} else {
Err(())
}
},
}
}

8
lightning/src/routing/router.rs
View File

@ -153,8 +153,12 @@ impl<G: Deref<Target = NetworkGraph<L>> + Clone, L: Deref, S: Deref, SP: Sized,
match paths {
Ok(paths) if !paths.is_empty() => Ok(paths),
_ => {
BlindedPath::one_hop_for_payment(recipient, tlvs, entropy_source, secp_ctx)
.map(|path| vec![path])
if network_graph.nodes().contains_key(&NodeId::from_pubkey(&recipient)) {
BlindedPath::one_hop_for_payment(recipient, tlvs, entropy_source, secp_ctx)
.map(|path| vec![path])
} else {
Err(())
}
},
}
}