-use ln::chan_utils::{HTLCOutputInCommitment, TxCreationKeys};
+use ln::chan_utils::{HTLCOutputInCommitment, TxCreationKeys, ChannelPublicKeys, LocalCommitmentTransaction};
+use ln::{chan_utils, msgs};
use chain::keysinterface::{ChannelKeys, InMemoryChannelKeys};
use std::cmp;
-use std::sync::Mutex;
+use std::sync::{Mutex, Arc};
use bitcoin::blockdata::transaction::Transaction;
-use bitcoin::blockdata::script::Script;
+use bitcoin::util::bip143;
-use secp256k1;
-use secp256k1::key::SecretKey;
-use secp256k1::{Secp256k1, Signature};
+use bitcoin::secp256k1;
+use bitcoin::secp256k1::key::{SecretKey, PublicKey};
+use bitcoin::secp256k1::{Secp256k1, Signature};
+use util::ser::{Writeable, Writer, Readable};
+use std::io::Error;
+use ln::msgs::DecodeError;
/// Enforces some rules on ChannelKeys calls. Eventually we will probably want to expose a variant
/// of this which would essentially be what you'd want to run on a hardware wallet.
+#[derive(Clone)]
pub struct EnforcingChannelKeys {
pub inner: InMemoryChannelKeys,
- commitment_number_obscure_and_last: Mutex<(Option<u64>, u64)>,
+ commitment_number_obscure_and_last: Arc<Mutex<(Option<u64>, u64)>>,
}
impl EnforcingChannelKeys {
pub fn new(inner: InMemoryChannelKeys) -> Self {
Self {
inner,
- commitment_number_obscure_and_last: Mutex::new((None, 0)),
+ commitment_number_obscure_and_last: Arc::new(Mutex::new((None, 0))),
}
}
}
+
+impl EnforcingChannelKeys {
+ fn check_keys<T: secp256k1::Signing + secp256k1::Verification>(&self, secp_ctx: &Secp256k1<T>,
+ keys: &TxCreationKeys) {
+ let revocation_base = PublicKey::from_secret_key(secp_ctx, &self.inner.revocation_base_key());
+ let htlc_base = PublicKey::from_secret_key(secp_ctx, &self.inner.htlc_base_key());
+
+ let remote_points = self.inner.remote_channel_pubkeys.as_ref().unwrap();
+
+ let keys_expected = TxCreationKeys::new(secp_ctx,
+ &keys.per_commitment_point,
+ &remote_points.delayed_payment_basepoint,
+ &remote_points.htlc_basepoint,
+ &revocation_base,
+ &htlc_base).unwrap();
+ if keys != &keys_expected { panic!("derived different per-tx keys") }
+ }
+}
+
impl ChannelKeys for EnforcingChannelKeys {
fn funding_key(&self) -> &SecretKey { self.inner.funding_key() }
fn revocation_base_key(&self) -> &SecretKey { self.inner.revocation_base_key() }
- fn payment_base_key(&self) -> &SecretKey { self.inner.payment_base_key() }
+ fn payment_key(&self) -> &SecretKey { self.inner.payment_key() }
fn delayed_payment_base_key(&self) -> &SecretKey { self.inner.delayed_payment_base_key() }
fn htlc_base_key(&self) -> &SecretKey { self.inner.htlc_base_key() }
fn commitment_seed(&self) -> &[u8; 32] { self.inner.commitment_seed() }
+ fn pubkeys<'a>(&'a self) -> &'a ChannelPublicKeys { self.inner.pubkeys() }
- fn sign_remote_commitment<T: secp256k1::Signing>(&self, channel_value_satoshis: u64, channel_funding_script: &Script, feerate_per_kw: u64, commitment_tx: &Transaction, keys: &TxCreationKeys, htlcs: &[&HTLCOutputInCommitment], to_self_delay: u16, secp_ctx: &Secp256k1<T>) -> Result<(Signature, Vec<Signature>), ()> {
- if commitment_tx.input.len() != 1 { panic!(); }
+ fn sign_remote_commitment<T: secp256k1::Signing + secp256k1::Verification>(&self, feerate_per_kw: u64, commitment_tx: &Transaction, keys: &TxCreationKeys, htlcs: &[&HTLCOutputInCommitment], to_self_delay: u16, secp_ctx: &Secp256k1<T>) -> Result<(Signature, Vec<Signature>), ()> {
+ if commitment_tx.input.len() != 1 { panic!("lightning commitment transactions have a single input"); }
+ self.check_keys(secp_ctx, keys);
let obscured_commitment_transaction_number = (commitment_tx.lock_time & 0xffffff) as u64 | ((commitment_tx.input[0].sequence as u64 & 0xffffff) << 3*8);
{
commitment_data.1 = cmp::max(commitment_number, commitment_data.1)
}
- Ok(self.inner.sign_remote_commitment(channel_value_satoshis, channel_funding_script, feerate_per_kw, commitment_tx, keys, htlcs, to_self_delay, secp_ctx).unwrap())
+ Ok(self.inner.sign_remote_commitment(feerate_per_kw, commitment_tx, keys, htlcs, to_self_delay, secp_ctx).unwrap())
+ }
+
+ fn sign_local_commitment<T: secp256k1::Signing + secp256k1::Verification>(&self, local_commitment_tx: &LocalCommitmentTransaction, secp_ctx: &Secp256k1<T>) -> Result<Signature, ()> {
+ Ok(self.inner.sign_local_commitment(local_commitment_tx, secp_ctx).unwrap())
+ }
+
+ #[cfg(test)]
+ fn unsafe_sign_local_commitment<T: secp256k1::Signing + secp256k1::Verification>(&self, local_commitment_tx: &LocalCommitmentTransaction, secp_ctx: &Secp256k1<T>) -> Result<Signature, ()> {
+ Ok(self.inner.unsafe_sign_local_commitment(local_commitment_tx, secp_ctx).unwrap())
+ }
+
+ fn sign_local_commitment_htlc_transactions<T: secp256k1::Signing + secp256k1::Verification>(&self, local_commitment_tx: &LocalCommitmentTransaction, local_csv: u16, secp_ctx: &Secp256k1<T>) -> Result<Vec<Option<Signature>>, ()> {
+ let commitment_txid = local_commitment_tx.txid();
+
+ for this_htlc in local_commitment_tx.per_htlc.iter() {
+ if this_htlc.0.transaction_output_index.is_some() {
+ let htlc_tx = chan_utils::build_htlc_transaction(&commitment_txid, local_commitment_tx.feerate_per_kw, local_csv, &this_htlc.0, &local_commitment_tx.local_keys.a_delayed_payment_key, &local_commitment_tx.local_keys.revocation_key);
+
+ let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&this_htlc.0, &local_commitment_tx.local_keys);
+
+ let sighash = hash_to_message!(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, this_htlc.0.amount_msat / 1000)[..]);
+ secp_ctx.verify(&sighash, this_htlc.1.as_ref().unwrap(), &local_commitment_tx.local_keys.b_htlc_key).unwrap();
+ }
+ }
+
+ Ok(self.inner.sign_local_commitment_htlc_transactions(local_commitment_tx, local_csv, secp_ctx).unwrap())
+ }
+
+ fn sign_closing_transaction<T: secp256k1::Signing>(&self, closing_tx: &Transaction, secp_ctx: &Secp256k1<T>) -> Result<Signature, ()> {
+ Ok(self.inner.sign_closing_transaction(closing_tx, secp_ctx).unwrap())
+ }
+
+ fn sign_channel_announcement<T: secp256k1::Signing>(&self, msg: &msgs::UnsignedChannelAnnouncement, secp_ctx: &Secp256k1<T>) -> Result<Signature, ()> {
+ self.inner.sign_channel_announcement(msg, secp_ctx)
+ }
+
+ fn set_remote_channel_pubkeys(&mut self, channel_pubkeys: &ChannelPublicKeys) {
+ self.inner.set_remote_channel_pubkeys(channel_pubkeys)
}
}
-impl_writeable!(EnforcingChannelKeys, 0, {
- inner,
- commitment_number_obscure_and_last
-});
+impl Writeable for EnforcingChannelKeys {
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), Error> {
+ self.inner.write(writer)?;
+ let (obscure, last) = *self.commitment_number_obscure_and_last.lock().unwrap();
+ obscure.write(writer)?;
+ last.write(writer)?;
+ Ok(())
+ }
+}
+
+impl Readable for EnforcingChannelKeys {
+ fn read<R: ::std::io::Read>(reader: &mut R) -> Result<Self, DecodeError> {
+ let inner = Readable::read(reader)?;
+ let obscure_and_last = Readable::read(reader)?;
+ Ok(EnforcingChannelKeys {
+ inner: inner,
+ commitment_number_obscure_and_last: Arc::new(Mutex::new(obscure_and_last))
+ })
+ }
+}
projects / rust-lightning / blobdiff