Let some tests disable revocation policy check

When simulating a bad actor that broadcasts a revoked tx, the policy check would otherwise panic.

Author: devrandom

fuzz/src/chanmon_consistency.rs

@@ -182,7 +182,7 @@ impl KeysInterface for KeyProvider {
 			(0, 0),
 		);
 		let revoked_commitment = self.make_revoked_commitment_cell(keys.commitment_seed);
-		EnforcingChannelKeys::new_with_revoked(keys, revoked_commitment)
+		EnforcingChannelKeys::new_with_revoked(keys, revoked_commitment, false)
 	}
 
 	fn get_secure_random_bytes(&self) -> [u8; 32] {
@@ -202,6 +202,7 @@ impl KeysInterface for KeyProvider {
 			inner,
 			last_commitment_number: Arc::new(Mutex::new(last_commitment_number)),
 			revoked_commitment,
+			disable_revocation_policy_check: false,
 		})
 	}
 }

lightning/src/ln/functional_tests.rs

@@ -2470,7 +2470,9 @@ fn test_justice_tx() {
 	bob_config.peer_channel_config_limits.force_announced_channel_preference = false;
 	bob_config.own_channel_config.our_to_self_delay = 6 * 24 * 3;
 	let user_cfgs = [Some(alice_config), Some(bob_config)];
-	let chanmon_cfgs = create_chanmon_cfgs(2);
+	let mut chanmon_cfgs = create_chanmon_cfgs(2);
+	chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
+	chanmon_cfgs[1].keys_manager.disable_revocation_policy_check = true;
 	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &user_cfgs);
 	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
@@ -2600,7 +2602,8 @@ fn revoked_output_claim() {
 #[test]
 fn claim_htlc_outputs_shared_tx() {
 	// Node revoked old state, htlcs haven't time out yet, claim them in shared justice tx
-	let chanmon_cfgs = create_chanmon_cfgs(2);
+	let mut chanmon_cfgs = create_chanmon_cfgs(2);
+	chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
 	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
@@ -2670,7 +2673,8 @@ fn claim_htlc_outputs_shared_tx() {
 #[test]
 fn claim_htlc_outputs_single_tx() {
 	// Node revoked old state, htlcs have timed out, claim each of them in separated justice tx
-	let chanmon_cfgs = create_chanmon_cfgs(2);
+	let mut chanmon_cfgs = create_chanmon_cfgs(2);
+	chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
 	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
@@ -4993,7 +4997,8 @@ fn test_static_spendable_outputs_justice_tx_revoked_commitment_tx() {
 
 #[test]
 fn test_static_spendable_outputs_justice_tx_revoked_htlc_timeout_tx() {
-	let chanmon_cfgs = create_chanmon_cfgs(2);
+	let mut chanmon_cfgs = create_chanmon_cfgs(2);
+	chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
 	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
@@ -5059,7 +5064,8 @@ fn test_static_spendable_outputs_justice_tx_revoked_htlc_timeout_tx() {
 
 #[test]
 fn test_static_spendable_outputs_justice_tx_revoked_htlc_success_tx() {
-	let chanmon_cfgs = create_chanmon_cfgs(2);
+	let mut chanmon_cfgs = create_chanmon_cfgs(2);
+	chanmon_cfgs[1].keys_manager.disable_revocation_policy_check = true;
 	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
@@ -7040,7 +7046,8 @@ fn do_test_failure_delay_dust_htlc_local_commitment(announce_latest: bool) {
 	// We can have at most two valid local commitment tx, so both cases must be covered, and both txs must be checked to get them all as
 	// HTLC could have been removed from lastest local commitment tx but still valid until we get remote RAA
 
-	let chanmon_cfgs = create_chanmon_cfgs(2);
+	let mut chanmon_cfgs = create_chanmon_cfgs(2);
+	chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
 	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
@@ -7379,7 +7386,10 @@ fn test_data_loss_protect() {
 	let fee_estimator;
 	let tx_broadcaster;
 	let chain_source;
-	let chanmon_cfgs = create_chanmon_cfgs(2);
+	let mut chanmon_cfgs = create_chanmon_cfgs(2);
+	// We broadcast during Drop because chanmon is out of sync with chanmgr, which would cause a panic
+	// during signing due to revoked tx
+	chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
 	let keys_manager = &chanmon_cfgs[0].keys_manager;
 	let monitor;
 	let node_state_0;
@@ -7699,7 +7709,8 @@ fn test_bump_penalty_txn_on_revoked_htlcs() {
 	// In case of penalty txn with too low feerates for getting into mempools, RBF-bump them to sure
 	// we're able to claim outputs on revoked HTLC transactions before timelocks expiration
 
-	let chanmon_cfgs = create_chanmon_cfgs(2);
+	let mut chanmon_cfgs = create_chanmon_cfgs(2);
+	chanmon_cfgs[1].keys_manager.disable_revocation_policy_check = true;
 	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);

lightning/src/util/enforcing_trait_impls.rs

@@ -27,31 +27,48 @@ use ln::msgs::DecodeError;
 /// Initial value for revoked commitment downward counter
 pub const INITIAL_REVOKED_COMMITMENT_NUMBER: u64 = 1 << 48;
 
-/// An implementation of ChannelKeys that enforces some policy checks.
+/// An implementation of ChannelKeys that enforces some policy checks.  The current checks
+/// are an incomplete set.  They include:
+///
+/// - When signing, the holder transaction has not been revoked
+/// - When revoking, the holder transaction has not been signed
+/// - The remote commitment number is monotonic and without gaps
+/// - The pre-derived keys and pre-built transaction in CommitmentTransaction were correctly built
 ///
 /// 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,
+	/// The last counterparty commitment number we signed, backwards counting
 	pub last_commitment_number: Arc<Mutex<Option<u64>>>,
+	/// The last holder commitment number we revoked, backwards counting
 	pub revoked_commitment: Arc<Mutex<u64>>,
+	pub disable_revocation_policy_check: bool,
 }
 
 impl EnforcingChannelKeys {
+	/// Construct an EnforcingChannelKeys
 	pub fn new(inner: InMemoryChannelKeys) -> Self {
 		Self {
 			inner,
 			last_commitment_number: Arc::new(Mutex::new(None)),
-			revoked_commitment: Arc::new(Mutex::new(INITIAL_REVOKED_COMMITMENT_NUMBER))
+			revoked_commitment: Arc::new(Mutex::new(INITIAL_REVOKED_COMMITMENT_NUMBER)),
+			disable_revocation_policy_check: false
 		}
 	}
 
-	pub fn new_with_revoked(inner: InMemoryChannelKeys, revoked_commitment: Arc<Mutex<u64>>) -> Self {
+	/// Construct an EnforcingChannelKeys with externally managed storage
+	///
+	/// Since there are multiple copies of this struct for each channel, some coordination is needed
+	/// so that all copies are aware of revocations.  A pointer to this state is provided here, usually
+	/// by an implementation of KeysInterface.
+	pub fn new_with_revoked(inner: InMemoryChannelKeys, revoked_commitment: Arc<Mutex<u64>>, disable_revocation_policy_check: bool) -> Self {
 		Self {
 			inner,
 			last_commitment_number: Arc::new(Mutex::new(None)),
-			revoked_commitment
+			revoked_commitment,
+			disable_revocation_policy_check
 		}
 	}
 }
@@ -62,8 +79,6 @@ impl ChannelKeys for EnforcingChannelKeys {
 	}
 
 	fn release_commitment_secret(&self, idx: u64) -> [u8; 32] {
-		println!("XXX revoke {} for {}", idx, self.inner.commitment_seed[0]);
-
 		{
 			let mut revoked = self.revoked_commitment.lock().unwrap();
 			assert!(idx == *revoked || idx == *revoked - 1, "can only revoke the current or next unrevoked commitment - trying {}, revoked {}", idx, *revoked);
@@ -98,11 +113,11 @@ impl ChannelKeys for EnforcingChannelKeys {
 
 		let revoked = self.revoked_commitment.lock().unwrap();
 		let commitment_number = trusted_tx.commitment_number();
-		println!("XXX sign {} for {}", commitment_number, self.inner.commitment_seed[0]);
 		if *revoked - 1 != commitment_number && *revoked - 2 != commitment_number {
-			println!("can only sign the next two unrevoked commitment numbers, revoked={} vs requested={} for {}",
-			         *revoked, commitment_number, self.inner.commitment_seed[0]);
-			return Err(());
+			if !self.disable_revocation_policy_check {
+				panic!("can only sign the next two unrevoked commitment numbers, revoked={} vs requested={} for {}",
+				       *revoked, commitment_number, self.inner.commitment_seed[0])
+			}
 		}
 
 		for (this_htlc, sig) in trusted_tx.htlcs().iter().zip(&commitment_tx.counterparty_htlc_sigs) {
@@ -116,8 +131,6 @@ impl ChannelKeys for EnforcingChannelKeys {
 			secp_ctx.verify(&sighash, sig, &keys.countersignatory_htlc_key).unwrap();
 		}
 
-		// TODO: enforce the ChannelKeys contract - error if this commitment was already revoked
-		// TODO: need the commitment number
 		Ok(self.inner.sign_holder_commitment_and_htlcs(commitment_tx, secp_ctx).unwrap())
 	}
 
@@ -165,6 +178,7 @@ impl Readable for EnforcingChannelKeys {
 			inner,
 			last_commitment_number: Arc::new(Mutex::new(last_commitment_number)),
 			revoked_commitment: Arc::new(Mutex::new(INITIAL_REVOKED_COMMITMENT_NUMBER)),
+			disable_revocation_policy_check: false,
 		})
 	}
 }

lightning/src/util/test_utils.rs

@@ -422,6 +422,7 @@ pub struct TestKeysInterface {
 	backing: keysinterface::KeysManager,
 	pub override_session_priv: Mutex<Option<[u8; 32]>>,
 	pub override_channel_id_priv: Mutex<Option<[u8; 32]>>,
+	pub disable_revocation_policy_check: bool,
 	revoked_commitments: Mutex<HashMap<[u8;32], Arc<Mutex<u64>>>>,
 }
 
@@ -434,7 +435,7 @@ impl keysinterface::KeysInterface for TestKeysInterface {
 	fn get_channel_keys(&self, inbound: bool, channel_value_satoshis: u64) -> EnforcingChannelKeys {
 		let keys = self.backing.get_channel_keys(inbound, channel_value_satoshis);
 		let revoked_commitment = self.make_revoked_commitment_cell(keys.commitment_seed);
-		EnforcingChannelKeys::new_with_revoked(keys, revoked_commitment)
+		EnforcingChannelKeys::new_with_revoked(keys, revoked_commitment, self.disable_revocation_policy_check)
 	}
 
 	fn get_secure_random_bytes(&self) -> [u8; 32] {
@@ -464,6 +465,7 @@ impl keysinterface::KeysInterface for TestKeysInterface {
 			inner,
 			last_commitment_number: Arc::new(Mutex::new(last_commitment_number)),
 			revoked_commitment,
+			disable_revocation_policy_check: self.disable_revocation_policy_check,
 		})
 	}
 }
@@ -476,13 +478,14 @@ impl TestKeysInterface {
 			backing: keysinterface::KeysManager::new(seed, network, now.as_secs(), now.subsec_nanos()),
 			override_session_priv: Mutex::new(None),
 			override_channel_id_priv: Mutex::new(None),
+			disable_revocation_policy_check: false,
 			revoked_commitments: Mutex::new(HashMap::new()),
 		}
 	}
 	pub fn derive_channel_keys(&self, channel_value_satoshis: u64, user_id_1: u64, user_id_2: u64) -> EnforcingChannelKeys {
 		let keys = self.backing.derive_channel_keys(channel_value_satoshis, user_id_1, user_id_2);
 		let revoked_commitment = self.make_revoked_commitment_cell(keys.commitment_seed);
-		EnforcingChannelKeys::new_with_revoked(keys, revoked_commitment)
+		EnforcingChannelKeys::new_with_revoked(keys, revoked_commitment, self.disable_revocation_policy_check)
 	}
 
 	fn make_revoked_commitment_cell(&self, commitment_seed: [u8; 32]) -> Arc<Mutex<u64>> {