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fix: avoid panic with invalid proposal data #97

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merged 4 commits into from
Apr 24, 2023
Merged

fix: avoid panic with invalid proposal data #97

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f7543dd
fix: avoid panic with invalid proposal data
mpetrun5 Apr 19, 2023
db5b183
Lint
mpetrun5 Apr 19, 2023
79c1e2d
Change extract deposit data error return type
mpetrun5 Apr 21, 2023
59344e4
Merge branch 'main' into mpetrun5/avoid-extract-data-panic
mpetrun5 Apr 24, 2023
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26 changes: 17 additions & 9 deletions bridge/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -741,24 +741,26 @@ pub mod pallet {
/// recipient data bytes bytes 64 - END
///
/// Only fungible transfer is supported so far.
fn extract_deposit_data(data: &Vec<u8>) -> Option<(u128, MultiLocation)> {
fn extract_deposit_data(data: &Vec<u8>) -> Result<(u128, MultiLocation), DispatchError> {
if data.len() < 64 {
return None
return Err(Error::<T>::InvalidDepositData.into())
}

let amount: u128 = U256::from_big_endian(&data[0..32])
.try_into()
.expect("Amount conversion failed.");
.map_err(|_| Error::<T>::InvalidDepositData)?;
let recipient_len: usize = U256::from_big_endian(&data[32..64])
.try_into()
.expect("Length conversion failed.");
.map_err(|_| Error::<T>::InvalidDepositData)?;
if (data.len() - 64) != recipient_len {
return None
return Err(Error::<T>::InvalidDepositData.into())
}

let recipient = data[64..data.len()].to_vec();
if let Ok(location) = <MultiLocation>::decode(&mut recipient.as_slice()) {
Some((amount, location))
Ok((amount, location))
} else {
None
Err(Error::<T>::InvalidDepositData.into())
}
}

Expand Down Expand Up @@ -805,8 +807,7 @@ pub mod pallet {
let asset_id =
Self::rid_to_assetid(&proposal.resource_id).ok_or(Error::<T>::AssetNotBound)?;
// Extract Receipt from proposal data to get corresponding location (MultiLocation)
let (amount, location) =
Self::extract_deposit_data(&proposal.data).ok_or(Error::<T>::InvalidDepositData)?;
let (amount, location) = Self::extract_deposit_data(&proposal.data)?;

// convert the asset decimal
let decimal_converted_asset =
Expand Down Expand Up @@ -1662,6 +1663,12 @@ pub mod pallet {
resource_id: NativeResourceId::get(),
data: SygmaBridge::create_deposit_data(amount, b"invalid recipient".to_vec()),
};
let empty_data_proposal = Proposal {
origin_domain_id: DEST_DOMAIN_ID,
deposit_nonce: 3,
resource_id: UsdcResourceId::get(),
data: vec![],
};

let proposals = vec![
valid_native_transfer_proposal,
Expand All @@ -1670,6 +1677,7 @@ pub mod pallet {
invalid_domainid_proposal,
invalid_resourceid_proposal,
invalid_recipient_proposal,
empty_data_proposal,
];

let final_message = SygmaBridge::construct_ecdsa_signing_proposals_data(&proposals);
Expand Down