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Use consistent cltv_expiry_delta in ForwardTlvs

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When converting from CounterpartyForwardingInfo to PaymentRelay, the
cltv_expiry_delta is copied. Then, when forming a blinded payment path,
the value is mutated so that esoteric values don't reveal information
about the path. However, the value was only used in computing
PaymentConstraints and wasn't actually updated in PaymentRelay. Move the
logic for modifying the cltv_expiry_delta to the conversion code to
avoid this inconsistency.
This commit is contained in:
Jeffrey Czyz 2024-01-11 13:13:12 -06:00
parent ea5de93dd9
commit 8053aa3df4
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GPG key ID: 3A4E08275D5E96D2
2 changed files with 20 additions and 13 deletions
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18
lightning/src/blinded_path/payment.rs
View file

@ -97,12 +97,24 @@ pub struct PaymentConstraints {
pub htlc_minimum_msat: u64,
}
impl From<CounterpartyForwardingInfo> for PaymentRelay {
fn from(info: CounterpartyForwardingInfo) -> Self {
impl TryFrom<CounterpartyForwardingInfo> for PaymentRelay {
type Error = ();
fn try_from(info: CounterpartyForwardingInfo) -> Result<Self, ()> {
let CounterpartyForwardingInfo {
fee_base_msat, fee_proportional_millionths, cltv_expiry_delta
} = info;
Self { cltv_expiry_delta, fee_proportional_millionths, fee_base_msat }
// Avoid exposing esoteric CLTV expiry deltas
let cltv_expiry_delta = match cltv_expiry_delta {
0..=40 => 40,
41..=80 => 80,
81..=144 => 144,
145..=216 => 216,
_ => return Err(()),
};
Ok(Self { cltv_expiry_delta, fee_proportional_millionths, fee_base_msat })
}
}

15
lightning/src/routing/router.rs
View file

@ -114,19 +114,14 @@ impl<G: Deref<Target = NetworkGraph<L>> + Clone, L: Deref, S: Deref, SP: Sized,
None => return None,
};
let payment_relay: PaymentRelay = match details.counterparty.forwarding_info {
Some(forwarding_info) => forwarding_info.into(),
Some(forwarding_info) => match forwarding_info.try_into() {
Ok(payment_relay) => payment_relay,
Err(()) => return None,
},
None => return None,
};
// Avoid exposing esoteric CLTV expiry deltas
let cltv_expiry_delta = match payment_relay.cltv_expiry_delta {
0..=40 => 40u32,
41..=80 => 80u32,
81..=144 => 144u32,
145..=216 => 216u32,
_ => return None,
};
let cltv_expiry_delta = payment_relay.cltv_expiry_delta as u32;
let payment_constraints = PaymentConstraints {
max_cltv_expiry: tlvs.payment_constraints.max_cltv_expiry + cltv_expiry_delta,
htlc_minimum_msat: details.inbound_htlc_minimum_msat.unwrap_or(0),