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Implement swap recover function for Alice

Browse Source 
This introduces a lot of duplication between the binary and the
library, but it's okay because this module should only be a temporary
measure until we allow recovery to be handled by the original state
machine.

Also, fix a bug in `xmr_btc::alice::action_generator` caused by the
incorrect assumption that Alice's ability to punish Bob could be
determined before the cancel transaction hits the blockchain.
This commit is contained in:
Lucas Soriano del Pino 2020-11-03 17:08:31 +11:00 committed by rishflab
parent b989e94322
commit 28225f8643
8 changed files with 242 additions and 97 deletions
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1
swap/Cargo.toml
View File

@ -14,6 +14,7 @@ base64 = "0.12"
bitcoin = { version = "0.23", features = ["rand", "use-serde"] } # TODO: Upgrade other crates in this repo to use this version.
bitcoin-harness = { git = "https://github.com/coblox/bitcoin-harness-rs", rev = "3be644cd9512c157d3337a189298b8257ed54d04" }
derivative = "2"
ecdsa_fun = { git = "https://github.com/LLFourn/secp256kfun", rev = "510d48ef6a2b19805f7f5c70c598e5b03f668e7a", features = ["libsecp_compat", "serde", "serialization"] }
futures = { version = "0.3", default-features = false }
genawaiter = "0.99.1"
libp2p = { version = "0.29", default-features = false, features = ["tcp-tokio", "yamux", "mplex", "dns", "noise", "request-response"] }

1
swap/src/lib.rs
View File

@ -6,6 +6,7 @@ pub mod bitcoin;
pub mod bob;
pub mod monero;
pub mod network;
pub mod recover;
pub mod state;
pub mod storage;
pub mod tor;

28
swap/src/main.rs
View File

@ -16,7 +16,6 @@ use anyhow::Result;
use futures::{channel::mpsc, StreamExt};
use libp2p::Multiaddr;
use log::LevelFilter;
use prettytable::{row, Table};
use std::{io, io::Write, process, sync::Arc};
use structopt::StructOpt;
use swap::{
@ -31,13 +30,11 @@ use swap::{
use tempfile::tempdir;
use tracing::info;
#[macro_use]
extern crate prettytable;
mod cli;
mod trace;
use cli::Options;
use swap::storage::Database;
// TODO: Add root seed file instead of generating new seed each run.
@ -47,6 +44,9 @@ async fn main() -> Result<()> {
trace::init_tracing(LevelFilter::Debug)?;
let db_dir = tempdir()?;
let db = Database::open(db_dir.path()).unwrap();
match opt {
Options::Alice {
bitcoind_url,
@ -85,7 +85,11 @@ async fn main() -> Result<()> {
let monero_wallet = Arc::new(monero::Wallet::new(monerod_url));
swap_as_alice(bitcoin_wallet, monero_wallet, dblisten_addr,
swap_as_alice(
bitcoin_wallet,
monero_wallet,
db,
listen_addr,
transport,
behaviour,
)
@ -115,12 +119,10 @@ async fn main() -> Result<()> {
let monero_wallet = Arc::new(monero::Wallet::new(monerod_url));
let db = Database::open(db_dir.path()).unwrap();
swap_as_bob(
bitcoin_wallet,
monero_wallet,
db
db,
satoshis,
alice_addr,
transport,
@ -159,7 +161,15 @@ async fn swap_as_alice(
transport: SwapTransport,
behaviour: Alice,
) -> Result<()> {
alice::swap(bitcoin_wallet, monero_wallet, addr, transport, behaviour).await
alice::swap(
bitcoin_wallet,
monero_wallet,
db,
addr,
transport,
behaviour,
)
.await
}
async fn swap_as_bob(

187
swap/src/recover.rs Normal file
View File

@ -0,0 +1,187 @@
use crate::{
monero::CreateWalletForOutput,
state::{Alice, Bob, Swap},
};
use anyhow::Result;
use futures::{
future::{select, Either},
pin_mut,
};
use xmr_btc::bitcoin::{
poll_until_block_height_is_gte, BroadcastSignedTransaction, TransactionBlockHeight, TxCancel,
TxPunish, TxRefund, WatchForRawTransaction,
};
pub async fn recover(
bitcoin_wallet: crate::bitcoin::Wallet,
monero_wallet: crate::monero::Wallet,
state: Swap,
) -> Result<()> {
match state {
Swap::Alice(state) => alice_recover(bitcoin_wallet, monero_wallet, state).await,
Swap::Bob(state) => bob_recover(bitcoin_wallet, monero_wallet, state).await,
}
}
pub async fn alice_recover(
bitcoin_wallet: crate::bitcoin::Wallet,
monero_wallet: crate::monero::Wallet,
state: Alice,
) -> Result<()> {
match state {
Alice::Handshaken(_) | Alice::BtcLocked(_) | Alice::SwapComplete => Ok(()),
Alice::XmrLocked(state) => {
let tx_cancel = TxCancel::new(
&state.tx_lock,
state.refund_timelock,
state.a.public(),
state.B.clone(),
);
// Ensure that TxCancel is on the blockchain
if bitcoin_wallet
.0
.get_raw_transaction(tx_cancel.txid())
.await
.is_err()
{
let tx_lock_height = bitcoin_wallet
.transaction_block_height(state.tx_lock.txid())
.await;
poll_until_block_height_is_gte(
&bitcoin_wallet,
tx_lock_height + state.refund_timelock,
)
.await;
let sig_a = state.a.sign(tx_cancel.digest());
let sig_b = state.tx_cancel_sig_bob.clone();
let tx_cancel = tx_cancel
.clone()
.add_signatures(
&state.tx_lock,
(state.a.public(), sig_a),
(state.B.clone(), sig_b),
)
.expect("sig_{a,b} to be valid signatures for tx_cancel");
// TODO: We should not fail if the transaction is already on the blockchain
bitcoin_wallet
.broadcast_signed_transaction(tx_cancel)
.await?;
}
let tx_cancel_height = bitcoin_wallet
.transaction_block_height(tx_cancel.txid())
.await;
let poll_until_bob_can_be_punished = poll_until_block_height_is_gte(
&bitcoin_wallet,
tx_cancel_height + state.punish_timelock,
);
pin_mut!(poll_until_bob_can_be_punished);
let tx_refund = TxRefund::new(&tx_cancel, &state.refund_address);
match select(
bitcoin_wallet.watch_for_raw_transaction(tx_refund.txid()),
poll_until_bob_can_be_punished,
)
.await
{
Either::Left((tx_refund_published, ..)) => {
let tx_refund_sig = tx_refund
.extract_signature_by_key(tx_refund_published, state.a.public())?;
let tx_refund_encsig = state
.a
.encsign(state.S_b_bitcoin.clone(), tx_refund.digest());
let s_b = xmr_btc::bitcoin::recover(
state.S_b_bitcoin,
tx_refund_sig,
tx_refund_encsig,
)?;
let s_b = monero::PrivateKey::from_scalar(
xmr_btc::monero::Scalar::from_bytes_mod_order(s_b.to_bytes()),
);
let s_a = monero::PrivateKey {
scalar: state.s_a.into_ed25519(),
};
monero_wallet
.create_and_load_wallet_for_output(s_a + s_b, state.v)
.await?;
}
Either::Right(_) => {
let tx_punish =
TxPunish::new(&tx_cancel, &state.punish_address, state.punish_timelock);
let sig_a = state.a.sign(tx_punish.digest());
let sig_b = state.tx_cancel_sig_bob.clone();
let sig_tx_punish = tx_punish.add_signatures(
&tx_cancel,
(state.a.public(), sig_a),
(state.B.clone(), sig_b),
)?;
bitcoin_wallet
.broadcast_signed_transaction(sig_tx_punish)
.await?;
}
};
Ok(())
}
Alice::BtcRedeemable { redeem_tx, .. } => {
bitcoin_wallet
.broadcast_signed_transaction(redeem_tx)
.await?;
Ok(())
}
Alice::BtcPunishable(state) => {
let tx_cancel = TxCancel::new(
&state.tx_lock,
state.refund_timelock,
state.a.public(),
state.B.clone(),
);
let tx_punish = TxPunish::new(&tx_cancel, &state.punish_address, state.punish_timelock);
let sig_a = state.a.sign(tx_punish.digest());
let sig_b = state.tx_cancel_sig_bob.clone();
let sig_tx_punish = tx_punish.add_signatures(
&tx_cancel,
(state.a.public(), sig_a),
(state.B.clone(), sig_b),
)?;
bitcoin_wallet
.broadcast_signed_transaction(sig_tx_punish)
.await?;
Ok(())
}
Alice::BtcRefunded {
view_key,
spend_key,
..
} => {
monero_wallet
.create_and_load_wallet_for_output(spend_key, view_key)
.await?;
Ok(())
}
}
}
pub async fn bob_recover(
_bitcoin_wallet: crate::bitcoin::Wallet,
_monero_wallet: crate::monero::Wallet,
_state: Bob,
) -> Result<()> {
todo!()
}

10
swap/src/storage.rs
View File

@ -33,7 +33,7 @@ impl Database {
.context("Could not flush db")
}
pub fn get_latest_state(&self, swap_id: Uuid) -> anyhow::Result<Swap> {
pub fn get_state(&self, swap_id: Uuid) -> anyhow::Result<Swap> {
let key = serialize(&swap_id)?;
let encoded = self
@ -103,11 +103,11 @@ mod tests {
.expect("Failed to save first state");
let recovered_1 = db
.get_latest_state(swap_id_1)
.get_state(swap_id_1)
.expect("Failed to recover first state");
let recovered_2 = db
.get_latest_state(swap_id_2)
.get_state(swap_id_2)
.expect("Failed to recover second state");
assert_eq!(recovered_1, state_1);
@ -126,7 +126,7 @@ mod tests {
.await
.expect("Failed to save state the first time");
let recovered = db
.get_latest_state(swap_id)
.get_state(swap_id)
.expect("Failed to recover state the first time");
// We insert and recover twice to ensure database implementation allows the
@ -135,7 +135,7 @@ mod tests {
.await
.expect("Failed to save state the second time");
let recovered = db
.get_latest_state(swap_id)
.get_state(swap_id)
.expect("Failed to recover state the second time");
assert_eq!(recovered, state);

11
swap/tests/e2e.rs
View File

@ -5,7 +5,8 @@ mod e2e_test {
use libp2p::Multiaddr;
use monero_harness::Monero;
use std::sync::Arc;
use swap::{alice, bob, network::transport::build};
use swap::{alice, bob, network::transport::build, storage::Database};
use tempfile::tempdir;
use testcontainers::clients::Cli;
// NOTE: For some reason running these tests overflows the stack. In order to
@ -48,10 +49,8 @@ mod e2e_test {
.await
.unwrap();
let (monero, _container) = Monero::new(&cli, Some("swap_".to_string()), vec![
"alice".to_string(),
"bob".to_string(),
])
let (monero, _container) =
Monero::new(&cli, None, vec!["alice".to_string(), "bob".to_string()])
.await
.unwrap();
monero
@ -68,7 +67,7 @@ mod e2e_test {
let alice_transport = build(alice_behaviour.identity()).unwrap();
let db_dir = tempdir().unwrap();
let db = Database::open(std::path::Path::new("/home/luckysori/test/xmr_btc_swap")).unwrap();
let db = Database::open(db_dir.path()).unwrap();
let alice_swap = alice::swap(
alice_btc_wallet.clone(),
alice_xmr_wallet.clone(),

93
xmr-btc/src/alice.rs
View File

@ -97,7 +97,7 @@ where
#[derive(Debug)]
enum SwapFailed {
BeforeBtcLock(Reason),
AfterXmrLock { tx_lock_height: u32, reason: Reason },
AfterXmrLock(Reason),
}
/// Reason why the swap has failed.
@ -114,9 +114,7 @@ where
#[derive(Debug)]
enum RefundFailed {
BtcPunishable {
tx_cancel_was_published: bool,
},
BtcPunishable,
/// Could not find Alice's signature on the refund transaction witness
/// stack.
BtcRefundSignature,
@ -167,12 +165,7 @@ where
.await
{
Either::Left((encsig, _)) => encsig,
Either::Right(_) => {
return Err(SwapFailed::AfterXmrLock {
reason: Reason::BtcExpired,
tx_lock_height,
})
}
Either::Right(_) => return Err(SwapFailed::AfterXmrLock(Reason::BtcExpired)),
};
tracing::debug!("select returned redeem encsig from message");
@ -191,10 +184,7 @@ where
&tx_redeem.digest(),
&tx_redeem_encsig,
)
.map_err(|_| SwapFailed::AfterXmrLock {
reason: Reason::InvalidEncryptedSignature,
tx_lock_height,
})?;
.map_err(|_| SwapFailed::AfterXmrLock(Reason::InvalidEncryptedSignature))?;
let sig_a = a.sign(tx_redeem.digest());
let sig_b =
@ -217,12 +207,7 @@ where
.await
{
Either::Left(_) => {}
Either::Right(_) => {
return Err(SwapFailed::AfterXmrLock {
reason: Reason::BtcExpired,
tx_lock_height,
})
}
Either::Right(_) => return Err(SwapFailed::AfterXmrLock(Reason::BtcExpired)),
};
Ok(())
@ -233,19 +218,8 @@ where
error!("swap failed: {:?}", err);
}
if let Err(SwapFailed::AfterXmrLock {
reason: Reason::BtcExpired,
tx_lock_height,
}) = swap_result
{
if let Err(SwapFailed::AfterXmrLock(Reason::BtcExpired)) = swap_result {
let refund_result: Result<(), RefundFailed> = async {
let poll_until_bob_can_be_punished = poll_until_block_height_is_gte(
bitcoin_client.as_ref(),
tx_lock_height + refund_timelock + punish_timelock,
)
.shared();
pin_mut!(poll_until_bob_can_be_punished);
let tx_cancel =
bitcoin::TxCancel::new(&tx_lock, refund_timelock, a.public(), B.clone());
let signed_tx_cancel = {
@ -260,19 +234,19 @@ where
co.yield_(Action::CancelBtc(signed_tx_cancel)).await;
match select(
bitcoin_client.watch_for_raw_transaction(tx_cancel.txid()),
poll_until_bob_can_be_punished.clone(),
bitcoin_client
.watch_for_raw_transaction(tx_cancel.txid())
.await;
let tx_cancel_height = bitcoin_client
.transaction_block_height(tx_cancel.txid())
.await;
let poll_until_bob_can_be_punished = poll_until_block_height_is_gte(
bitcoin_client.as_ref(),
tx_cancel_height + punish_timelock,
)
.await
{
Either::Left(_) => {}
Either::Right(_) => {
return Err(RefundFailed::BtcPunishable {
tx_cancel_was_published: false,
})
}
};
.shared();
pin_mut!(poll_until_bob_can_be_punished);
let tx_refund = bitcoin::TxRefund::new(&tx_cancel, &refund_address);
let tx_refund_published = match select(
@ -282,11 +256,7 @@ where
.await
{
Either::Left((tx, _)) => tx,
Either::Right(_) => {
return Err(RefundFailed::BtcPunishable {
tx_cancel_was_published: true,
});
}
Either::Right(_) => return Err(RefundFailed::BtcPunishable),
};
let s_a = monero::PrivateKey {
@ -321,32 +291,9 @@ where
// transaction with his refund transaction. Alice would then need to carry on
// with the refund on Monero. Doing so may be too verbose with the current,
// linear approach. A different design may be required
if let Err(RefundFailed::BtcPunishable {
tx_cancel_was_published,
}) = refund_result
{
if let Err(RefundFailed::BtcPunishable) = refund_result {
let tx_cancel =
bitcoin::TxCancel::new(&tx_lock, refund_timelock, a.public(), B.clone());
if !tx_cancel_was_published {
let tx_cancel_txid = tx_cancel.txid();
let signed_tx_cancel = {
let sig_a = a.sign(tx_cancel.digest());
let sig_b = tx_cancel_sig_bob;
tx_cancel
.clone()
.add_signatures(&tx_lock, (a.public(), sig_a), (B.clone(), sig_b))
.expect("sig_{a,b} to be valid signatures for tx_cancel")
};
co.yield_(Action::CancelBtc(signed_tx_cancel)).await;
let _ = bitcoin_client
.watch_for_raw_transaction(tx_cancel_txid)
.await;
}
let tx_punish =
bitcoin::TxPunish::new(&tx_cancel, &punish_address, punish_timelock);
let tx_punish_txid = tx_punish.txid();

4
xmr-btc/src/bob.rs
View File

@ -507,10 +507,10 @@ pub struct State2 {
btc: bitcoin::Amount,
pub xmr: monero::Amount,
pub refund_timelock: u32,
punish_timelock: u32,
pub punish_timelock: u32,
pub refund_address: bitcoin::Address,
pub redeem_address: bitcoin::Address,
punish_address: bitcoin::Address,
pub punish_address: bitcoin::Address,
pub tx_lock: bitcoin::TxLock,
pub tx_cancel_sig_a: Signature,
pub tx_refund_encsig: EncryptedSignature,