use util::chacha20::ChaCha20;
use util::logger::Logger;
use util::errors::APIError;
-use util::errors;
use std::{cmp, mem};
use std::collections::{HashMap, hash_map, HashSet};
match &onion_error {
&HTLCFailReason::ErrorPacket { ref err } => {
#[cfg(test)]
- let (channel_update, payment_retryable, onion_error_code) = self.process_onion_failure(&source, err.data.clone());
+ let (channel_update, payment_retryable, onion_error_code) = onion_utils::process_onion_failure(&self.secp_ctx, &self.logger, &source, err.data.clone());
#[cfg(not(test))]
- let (channel_update, payment_retryable, _) = self.process_onion_failure(&source, err.data.clone());
+ let (channel_update, payment_retryable, _) = onion_utils::process_onion_failure(&self.secp_ctx, &self.logger, &source, err.data.clone());
// TODO: If we decided to blame ourselves (or one of our channels) in
// process_onion_failure we should close that channel as it implies our
// next-hop is needlessly blaming us!
Ok(())
}
- // Process failure we got back from upstream on a payment we sent. Returns update and a boolean
- // indicating that the payment itself failed
- fn process_onion_failure(&self, htlc_source: &HTLCSource, mut packet_decrypted: Vec<u8>) -> (Option<msgs::HTLCFailChannelUpdate>, bool, Option<u16>) {
- if let &HTLCSource::OutboundRoute { ref route, ref session_priv, ref first_hop_htlc_msat } = htlc_source {
-
- let mut res = None;
- let mut htlc_msat = *first_hop_htlc_msat;
- let mut error_code_ret = None;
- let mut next_route_hop_ix = 0;
- let mut is_from_final_node = false;
-
- // Handle packed channel/node updates for passing back for the route handler
- onion_utils::construct_onion_keys_callback(&self.secp_ctx, route, session_priv, |shared_secret, _, _, route_hop| {
- next_route_hop_ix += 1;
- if res.is_some() { return; }
-
- let amt_to_forward = htlc_msat - route_hop.fee_msat;
- htlc_msat = amt_to_forward;
-
- let ammag = onion_utils::gen_ammag_from_shared_secret(&shared_secret[..]);
-
- let mut decryption_tmp = Vec::with_capacity(packet_decrypted.len());
- decryption_tmp.resize(packet_decrypted.len(), 0);
- let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
- chacha.process(&packet_decrypted, &mut decryption_tmp[..]);
- packet_decrypted = decryption_tmp;
-
- is_from_final_node = route.hops.last().unwrap().pubkey == route_hop.pubkey;
-
- if let Ok(err_packet) = msgs::DecodedOnionErrorPacket::read(&mut Cursor::new(&packet_decrypted)) {
- let um = onion_utils::gen_um_from_shared_secret(&shared_secret[..]);
- let mut hmac = HmacEngine::<Sha256>::new(&um);
- hmac.input(&err_packet.encode()[32..]);
-
- if fixed_time_eq(&Hmac::from_engine(hmac).into_inner(), &err_packet.hmac) {
- if let Some(error_code_slice) = err_packet.failuremsg.get(0..2) {
- const PERM: u16 = 0x4000;
- const NODE: u16 = 0x2000;
- const UPDATE: u16 = 0x1000;
-
- let error_code = byte_utils::slice_to_be16(&error_code_slice);
- error_code_ret = Some(error_code);
-
- let (debug_field, debug_field_size) = errors::get_onion_debug_field(error_code);
-
- // indicate that payment parameter has failed and no need to
- // update Route object
- let payment_failed = (match error_code & 0xff {
- 15|16|17|18|19 => true,
- _ => false,
- } && is_from_final_node) // PERM bit observed below even this error is from the intermediate nodes
- || error_code == 21; // Special case error 21 as the Route object is bogus, TODO: Maybe fail the node if the CLTV was reasonable?
-
- let mut fail_channel_update = None;
-
- if error_code & NODE == NODE {
- fail_channel_update = Some(msgs::HTLCFailChannelUpdate::NodeFailure { node_id: route_hop.pubkey, is_permanent: error_code & PERM == PERM });
- }
- else if error_code & PERM == PERM {
- fail_channel_update = if payment_failed {None} else {Some(msgs::HTLCFailChannelUpdate::ChannelClosed {
- short_channel_id: route.hops[next_route_hop_ix - if next_route_hop_ix == route.hops.len() { 1 } else { 0 }].short_channel_id,
- is_permanent: true,
- })};
- }
- else if error_code & UPDATE == UPDATE {
- if let Some(update_len_slice) = err_packet.failuremsg.get(debug_field_size+2..debug_field_size+4) {
- let update_len = byte_utils::slice_to_be16(&update_len_slice) as usize;
- if let Some(update_slice) = err_packet.failuremsg.get(debug_field_size + 4..debug_field_size + 4 + update_len) {
- if let Ok(chan_update) = msgs::ChannelUpdate::read(&mut Cursor::new(&update_slice)) {
- // if channel_update should NOT have caused the failure:
- // MAY treat the channel_update as invalid.
- let is_chan_update_invalid = match error_code & 0xff {
- 7 => false,
- 11 => amt_to_forward > chan_update.contents.htlc_minimum_msat,
- 12 => {
- let new_fee = amt_to_forward.checked_mul(chan_update.contents.fee_proportional_millionths as u64).and_then(|prop_fee| { (prop_fee / 1000000).checked_add(chan_update.contents.fee_base_msat as u64) });
- new_fee.is_some() && route_hop.fee_msat >= new_fee.unwrap()
- }
- 13 => route_hop.cltv_expiry_delta as u16 >= chan_update.contents.cltv_expiry_delta,
- 14 => false, // expiry_too_soon; always valid?
- 20 => chan_update.contents.flags & 2 == 0,
- _ => false, // unknown error code; take channel_update as valid
- };
- fail_channel_update = if is_chan_update_invalid {
- // This probably indicates the node which forwarded
- // to the node in question corrupted something.
- Some(msgs::HTLCFailChannelUpdate::ChannelClosed {
- short_channel_id: route_hop.short_channel_id,
- is_permanent: true,
- })
- } else {
- Some(msgs::HTLCFailChannelUpdate::ChannelUpdateMessage {
- msg: chan_update,
- })
- };
- }
- }
- }
- if fail_channel_update.is_none() {
- // They provided an UPDATE which was obviously bogus, not worth
- // trying to relay through them anymore.
- fail_channel_update = Some(msgs::HTLCFailChannelUpdate::NodeFailure {
- node_id: route_hop.pubkey,
- is_permanent: true,
- });
- }
- } else if !payment_failed {
- // We can't understand their error messages and they failed to
- // forward...they probably can't understand our forwards so its
- // really not worth trying any further.
- fail_channel_update = Some(msgs::HTLCFailChannelUpdate::NodeFailure {
- node_id: route_hop.pubkey,
- is_permanent: true,
- });
- }
-
- // TODO: Here (and a few other places) we assume that BADONION errors
- // are always "sourced" from the node previous to the one which failed
- // to decode the onion.
- res = Some((fail_channel_update, !(error_code & PERM == PERM && is_from_final_node)));
-
- let (description, title) = errors::get_onion_error_description(error_code);
- if debug_field_size > 0 && err_packet.failuremsg.len() >= 4 + debug_field_size {
- log_warn!(self, "Onion Error[{}({:#x}) {}({})] {}", title, error_code, debug_field, log_bytes!(&err_packet.failuremsg[4..4+debug_field_size]), description);
- }
- else {
- log_warn!(self, "Onion Error[{}({:#x})] {}", title, error_code, description);
- }
- } else {
- // Useless packet that we can't use but it passed HMAC, so it
- // definitely came from the peer in question
- res = Some((Some(msgs::HTLCFailChannelUpdate::NodeFailure {
- node_id: route_hop.pubkey,
- is_permanent: true,
- }), !is_from_final_node));
- }
- }
- }
- }).expect("Route that we sent via spontaneously grew invalid keys in the middle of it?");
- if let Some((channel_update, payment_retryable)) = res {
- (channel_update, payment_retryable, error_code_ret)
- } else {
- // only not set either packet unparseable or hmac does not match with any
- // payment not retryable only when garbage is from the final node
- (None, !is_from_final_node, None)
- }
- } else { unreachable!(); }
- }
-
fn internal_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<(), MsgHandleErrInternal> {
let mut channel_lock = self.channel_state.lock().unwrap();
let channel_state = channel_lock.borrow_parts();
projects / rust-lightning / blobdiff