Check unknown features compared to handlers

Each message handler provides which features it supports. A custom
message handler may support unknown features. Therefore, these features
should be checked against instead of the features known by LDK.
Additionally, fail the connection if the peer requires features unknown
to the handler. The peer should already fail the connection in the
latter case.

diff --git a/fuzz/src/full_stack.rs b/fuzz/src/full_stack.rs
index d044a35f01bba364a8d17d1831591df4f74c8627..5399b66aee6bce8ec669c095bff9b8f8c0af4b59 100644 (file)
--- a/fuzz/src/full_stack.rs
+++ b/fuzz/src/full_stack.rs
@@ -752,16 +752,16 @@ mod tests {
                // 00 030000000000000000000000000000000000000000000000000000000000000002 03000000000000000000000000000000 - noise act two (0||pubkey||mac)
                //
                // 030012 - inbound read from peer id 0 of len 18
-               // 000a 03000000000000000000000000000000 - message header indicating message length 10
-               // 03001a - inbound read from peer id 0 of len 26
-               // 0010 00022000 00022000 03000000000000000000000000000000 - init message (type 16) with static_remotekey (0x2000) and mac
+               // 0010 03000000000000000000000000000000 - message header indicating message length 16
+               // 030020 - inbound read from peer id 0 of len 32
+               // 0010 00021aaa 0008aaaaaaaaaaaa9aaa 03000000000000000000000000000000 - init message (type 16) with static_remotekey required and other bits optional and mac
                //
                // 030012 - inbound read from peer id 0 of len 18
-               // 0141 03000000000000000000000000000000 - message header indicating message length 321
+               // 0147 03000000000000000000000000000000 - message header indicating message length 327
                // 0300fe - inbound read from peer id 0 of len 254
                // 0020 7500000000000000000000000000000000000000000000000000000000000000 ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb181909679 000000000000c350 0000000000000000 0000000000000162 ffffffffffffffff 0000000000000222 0000000000000000 000000fd 0006 01e3 030000000000000000000000000000000000000000000000000000000000000001 030000000000000000000000000000000000000000000000000000000000000002 030000000000000000000000000000000000000000000000000000000000000003 030000000000000000000000000000000000000000000000000000000000000004 - beginning of open_channel message
-               // 030053 - inbound read from peer id 0 of len 83
-               // 030000000000000000000000000000000000000000000000000000000000000005 020900000000000000000000000000000000000000000000000000000000000000 01 03000000000000000000000000000000 - rest of open_channel and mac
+               // 030059 - inbound read from peer id 0 of len 89
+               // 030000000000000000000000000000000000000000000000000000000000000005 020900000000000000000000000000000000000000000000000000000000000000 01 0000 01021000 03000000000000000000000000000000 - rest of open_channel and mac
                //
                // 00fd00fd - Two feerate requests (all returning min feerate, which our open_channel also uses) (gonna be ingested by FuzzEstimator)
                // - client should now respond with accept_channel (CHECK 1: type 33 to peer 03000000)
@@ -800,19 +800,19 @@ mod tests {
                // 000302000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000003000000000000000000000000000000 - inbound noise act 3
                //
                // 030112 - inbound read from peer id 1 of len 18
-               // 000a 01000000000000000000000000000000 - message header indicating message length 10
-               // 03011a - inbound read from peer id 1 of len 26
-               // 0010 00022000 00022000 01000000000000000000000000000000 - init message (type 16) with static_remotekey (0x2000) and mac
+               // 0010 01000000000000000000000000000000 - message header indicating message length 16
+               // 030120 - inbound read from peer id 1 of len 32
+               // 0010 00021aaa 0008aaaaaaaaaaaa9aaa 01000000000000000000000000000000 - init message (type 16) with static_remotekey required and other bits optional and mac
                //
                // 05 01 030200000000000000000000000000000000000000000000000000000000000000 00c350 0003e8 - create outbound channel to peer 1 for 50k sat
                // 00fd - One feerate requests (all returning min feerate) (gonna be ingested by FuzzEstimator)
                //
                // 030112 - inbound read from peer id 1 of len 18
-               // 0110 01000000000000000000000000000000 - message header indicating message length 272
+               // 0112 01000000000000000000000000000000 - message header indicating message length 274
                // 0301ff - inbound read from peer id 1 of len 255
                // 0021 0000000000000000000000000000000000000000000000000000000000000e05 0000000000000162 00000000004c4b40 00000000000003e8 00000000000003e8 00000002 03f0 0005 030000000000000000000000000000000000000000000000000000000000000100 030000000000000000000000000000000000000000000000000000000000000200 030000000000000000000000000000000000000000000000000000000000000300 030000000000000000000000000000000000000000000000000000000000000400 030000000000000000000000000000000000000000000000000000000000000500 02660000000000000000000000000000 - beginning of accept_channel
-               // 030121 - inbound read from peer id 1 of len 33
-               // 0000000000000000000000000000000000 01000000000000000000000000000000 - rest of accept_channel and mac
+               // 030123 - inbound read from peer id 1 of len 35
+               // 0000000000000000000000000000000000 0000 01000000000000000000000000000000 - rest of accept_channel and mac
                //
                // 0a - create the funding transaction (client should send funding_created now)
                //
@@ -1006,7 +1006,7 @@ mod tests {
                // - client now fails the HTLC backwards as it was unable to extract the payment preimage (CHECK 9 duplicate and CHECK 10)
 
                let logger = Arc::new(TrackingLogger { lines: Mutex::new(HashMap::new()) });
-               super::do_test(&::hex::decode("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&(Arc::clone(&logger) as Arc<dyn Logger>));
+               super::do_test(&::hex::decode("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&(Arc::clone(&logger) as Arc<dyn Logger>));
 
                let log_entries = logger.lines.lock().unwrap();
                assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling SendAcceptChannel event in peer_handler for node 030000000000000000000000000000000000000000000000000000000000000002 for channel ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb181909679".to_string())), Some(&1)); // 1

diff --git a/lightning/src/ln/peer_handler.rs b/lightning/src/ln/peer_handler.rs
index ae2a52378e4279337afe4e04731eb1e1727b6487..012d4bfb0b93d7109500e5553de879ffe4437da6 100644 (file)
--- a/lightning/src/ln/peer_handler.rs
+++ b/lightning/src/ln/peer_handler.rs
@@ -1401,10 +1401,17 @@ impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CM
 
                // Need an Init as first message
                if let wire::Message::Init(msg) = message {
-                       if msg.features.requires_unknown_bits() {
-                               log_debug!(self.logger, "Peer features required unknown version bits");
+                       let our_features = self.init_features(&their_node_id);
+                       if msg.features.requires_unknown_bits_from(&our_features) {
+                               log_debug!(self.logger, "Peer requires features unknown to us");
                                return Err(PeerHandleError { }.into());
                        }
+
+                       if our_features.requires_unknown_bits_from(&msg.features) {
+                               log_debug!(self.logger, "We require features unknown to our peer");
+                               return Err(PeerHandleError { }.into());
+                       }
+
                        if peer_lock.their_features.is_some() {
                                return Err(PeerHandleError { }.into());
                        }
@@ -2276,16 +2283,19 @@ fn is_gossip_msg(type_id: u16) -> bool {
 mod tests {
        use crate::sign::{NodeSigner, Recipient};
        use crate::events;
+       use crate::io;
+       use crate::ln::features::{InitFeatures, NodeFeatures};
        use crate::ln::peer_channel_encryptor::PeerChannelEncryptor;
-       use crate::ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor, IgnoringMessageHandler, filter_addresses};
+       use crate::ln::peer_handler::{CustomMessageHandler, PeerManager, MessageHandler, SocketDescriptor, IgnoringMessageHandler, filter_addresses};
        use crate::ln::{msgs, wire};
-       use crate::ln::msgs::NetAddress;
+       use crate::ln::msgs::{LightningError, NetAddress};
        use crate::util::test_utils;
 
-       use bitcoin::secp256k1::SecretKey;
+       use bitcoin::secp256k1::{PublicKey, SecretKey};
 
        use crate::prelude::*;
        use crate::sync::{Arc, Mutex};
+       use core::convert::Infallible;
        use core::sync::atomic::{AtomicBool, Ordering};
 
        #[derive(Clone)]
@@ -2318,19 +2328,74 @@ mod tests {
        struct PeerManagerCfg {
                chan_handler: test_utils::TestChannelMessageHandler,
                routing_handler: test_utils::TestRoutingMessageHandler,
+               custom_handler: TestCustomMessageHandler,
                logger: test_utils::TestLogger,
                node_signer: test_utils::TestNodeSigner,
        }
 
+       struct TestCustomMessageHandler {
+               features: InitFeatures,
+       }
+
+       impl wire::CustomMessageReader for TestCustomMessageHandler {
+               type CustomMessage = Infallible;
+               fn read<R: io::Read>(&self, _: u16, _: &mut R) -> Result<Option<Self::CustomMessage>, msgs::DecodeError> {
+                       Ok(None)
+               }
+       }
+
+       impl CustomMessageHandler for TestCustomMessageHandler {
+               fn handle_custom_message(&self, _: Infallible, _: &PublicKey) -> Result<(), LightningError> {
+                       unreachable!();
+               }
+
+               fn get_and_clear_pending_msg(&self) -> Vec<(PublicKey, Self::CustomMessage)> { Vec::new() }
+
+               fn provided_node_features(&self) -> NodeFeatures { NodeFeatures::empty() }
+
+               fn provided_init_features(&self, _: &PublicKey) -> InitFeatures {
+                       self.features.clone()
+               }
+       }
+
        fn create_peermgr_cfgs(peer_count: usize) -> Vec<PeerManagerCfg> {
                let mut cfgs = Vec::new();
                for i in 0..peer_count {
                        let node_secret = SecretKey::from_slice(&[42 + i as u8; 32]).unwrap();
+                       let features = {
+                               let mut feature_bits = vec![0u8; 33];
+                               feature_bits[32] = 0b00000001;
+                               InitFeatures::from_le_bytes(feature_bits)
+                       };
+                       cfgs.push(
+                               PeerManagerCfg{
+                                       chan_handler: test_utils::TestChannelMessageHandler::new(),
+                                       logger: test_utils::TestLogger::new(),
+                                       routing_handler: test_utils::TestRoutingMessageHandler::new(),
+                                       custom_handler: TestCustomMessageHandler { features },
+                                       node_signer: test_utils::TestNodeSigner::new(node_secret),
+                               }
+                       );
+               }
+
+               cfgs
+       }
+
+       fn create_incompatible_peermgr_cfgs(peer_count: usize) -> Vec<PeerManagerCfg> {
+               let mut cfgs = Vec::new();
+               for i in 0..peer_count {
+                       let node_secret = SecretKey::from_slice(&[42 + i as u8; 32]).unwrap();
+                       let features = {
+                               let mut feature_bits = vec![0u8; 33 + i + 1];
+                               feature_bits[33 + i] = 0b00000001;
+                               InitFeatures::from_le_bytes(feature_bits)
+                       };
                        cfgs.push(
                                PeerManagerCfg{
                                        chan_handler: test_utils::TestChannelMessageHandler::new(),
                                        logger: test_utils::TestLogger::new(),
                                        routing_handler: test_utils::TestRoutingMessageHandler::new(),
+                                       custom_handler: TestCustomMessageHandler { features },
                                        node_signer: test_utils::TestNodeSigner::new(node_secret),
                                }
                        );
@@ -2339,13 +2404,13 @@ mod tests {
                cfgs
        }
 
-       fn create_network<'a>(peer_count: usize, cfgs: &'a Vec<PeerManagerCfg>) -> Vec<PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, IgnoringMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler, &'a test_utils::TestNodeSigner>> {
+       fn create_network<'a>(peer_count: usize, cfgs: &'a Vec<PeerManagerCfg>) -> Vec<PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, IgnoringMessageHandler, &'a test_utils::TestLogger, &'a TestCustomMessageHandler, &'a test_utils::TestNodeSigner>> {
                let mut peers = Vec::new();
                for i in 0..peer_count {
                        let ephemeral_bytes = [i as u8; 32];
                        let msg_handler = MessageHandler {
                                chan_handler: &cfgs[i].chan_handler, route_handler: &cfgs[i].routing_handler,
-                               onion_message_handler: IgnoringMessageHandler {}, custom_message_handler: IgnoringMessageHandler {}
+                               onion_message_handler: IgnoringMessageHandler {}, custom_message_handler: &cfgs[i].custom_handler
                        };
                        let peer = PeerManager::new(msg_handler, 0, &ephemeral_bytes, &cfgs[i].logger, &cfgs[i].node_signer);
                        peers.push(peer);
@@ -2354,7 +2419,7 @@ mod tests {
                peers
        }
 
-       fn establish_connection<'a>(peer_a: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, IgnoringMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler, &'a test_utils::TestNodeSigner>, peer_b: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, IgnoringMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler, &'a test_utils::TestNodeSigner>) -> (FileDescriptor, FileDescriptor) {
+       fn establish_connection<'a>(peer_a: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, IgnoringMessageHandler, &'a test_utils::TestLogger, &'a TestCustomMessageHandler, &'a test_utils::TestNodeSigner>, peer_b: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, IgnoringMessageHandler, &'a test_utils::TestLogger, &'a TestCustomMessageHandler, &'a test_utils::TestNodeSigner>) -> (FileDescriptor, FileDescriptor) {
                let id_a = peer_a.node_signer.get_node_id(Recipient::Node).unwrap();
                let mut fd_a = FileDescriptor {
                        fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())),
@@ -2469,6 +2534,42 @@ mod tests {
                thrd_b.join().unwrap();
        }
 
+       #[test]
+       fn test_incompatible_peers() {
+               let cfgs = create_peermgr_cfgs(2);
+               let incompatible_cfgs = create_incompatible_peermgr_cfgs(2);
+
+               let peers = create_network(2, &cfgs);
+               let incompatible_peers = create_network(2, &incompatible_cfgs);
+               let peer_pairs = [(&peers[0], &incompatible_peers[0]), (&incompatible_peers[1], &peers[1])];
+               for (peer_a, peer_b) in peer_pairs.iter() {
+                       let id_a = peer_a.node_signer.get_node_id(Recipient::Node).unwrap();
+                       let mut fd_a = FileDescriptor {
+                               fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())),
+                               disconnect: Arc::new(AtomicBool::new(false)),
+                       };
+                       let addr_a = NetAddress::IPv4{addr: [127, 0, 0, 1], port: 1000};
+                       let mut fd_b = FileDescriptor {
+                               fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())),
+                               disconnect: Arc::new(AtomicBool::new(false)),
+                       };
+                       let addr_b = NetAddress::IPv4{addr: [127, 0, 0, 1], port: 1001};
+                       let initial_data = peer_b.new_outbound_connection(id_a, fd_b.clone(), Some(addr_a.clone())).unwrap();
+                       peer_a.new_inbound_connection(fd_a.clone(), Some(addr_b.clone())).unwrap();
+                       assert_eq!(peer_a.read_event(&mut fd_a, &initial_data).unwrap(), false);
+                       peer_a.process_events();
+
+                       let a_data = fd_a.outbound_data.lock().unwrap().split_off(0);
+                       assert_eq!(peer_b.read_event(&mut fd_b, &a_data).unwrap(), false);
+
+                       peer_b.process_events();
+                       let b_data = fd_b.outbound_data.lock().unwrap().split_off(0);
+
+                       // Should fail because of unknown required features
+                       assert!(peer_a.read_event(&mut fd_a, &b_data).is_err());
+               }
+       }
+
        #[test]
        fn test_disconnect_peer() {
                // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and