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Handle v1 Monero TXs spending v2 outputs

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Also tightens read/fixes a few potential panics.
This commit is contained in:
Luke Parker 2023-08-21 11:41:14 -04:00
parent f2872a2e07
commit bfb5401336
No known key found for this signature in database
2 changed files with 35 additions and 10 deletions
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2
coins/monero/src/bin/reserialize_chain.rs
View file

@ -52,7 +52,7 @@ mod binaries {
let blob = hex::decode(res.blob).expect("node returned non-hex block");
let block = Block::read(&mut blob.as_slice())
.unwrap_or_else(|_| panic!("couldn't deserialize block {block_i}"));
.unwrap_or_else(|e| panic!("couldn't deserialize block {block_i}: {e}"));
assert_eq!(block.hash(), hash, "hash differs");
assert_eq!(block.serialize(), blob, "serialization differs");

43
coins/monero/src/transaction.rs
View file

@ -315,15 +315,40 @@ impl Transaction {
})
.collect::<Result<_, _>>()?;
rct_signatures.base.fee = prefix
.inputs
.iter()
.map(|input| match input {
Input::Gen(..) => 0,
Input::ToKey { amount, .. } => amount.unwrap(),
})
.sum::<u64>()
.saturating_sub(prefix.outputs.iter().map(|output| output.amount.unwrap()).sum());
if !matches!(prefix.inputs[0], Input::Gen(..)) {
let in_amount = prefix
.inputs
.iter()
.map(|input| match input {
Input::Gen(..) => {
Err(io::Error::new(io::ErrorKind::Other, "Input::Gen present in non-coinbase v1 TX"))?
}
// v1 TXs can burn v2 outputs
// dcff3fe4f914d6b6bd4a5b800cc4cca8f2fdd1bd73352f0700d463d36812f328 is one such TX
// It includes a pre-RCT signature for a RCT output, yet if you interpret the RCT
// output as being worth 0, it passes a sum check (guaranteed since no outputs are RCT)
Input::ToKey { amount, .. } => Ok(amount.unwrap_or(0)),
})
.collect::<io::Result<Vec<_>>>()?
.into_iter()
.sum::<u64>();
let mut out = 0;
for output in &prefix.outputs {
if output.amount.is_none() {
Err(io::Error::new(io::ErrorKind::Other, "v1 transaction had a 0-amount output"))?;
}
out += output.amount.unwrap();
}
if in_amount < out {
Err(io::Error::new(
io::ErrorKind::Other,
"transaction spent more than it had as inputs",
))?;
}
rct_signatures.base.fee = in_amount - out;
}
} else if prefix.version == 2 {
rct_signatures = RctSignatures::read(
prefix