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[fastx authority] Unify lock checks on order and certificate (MystenL…
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…abs#313)

* Unify lock checks on order and certificate

Co-authored-by: George Danezis <george@danez.is>
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gdanezis and George Danezis authored Jan 31, 2022
1 parent ed738c7 commit 945fa41
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Showing 5 changed files with 145 additions and 123 deletions.
247 changes: 132 additions & 115 deletions fastpay_core/src/authority.rs
Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ use move_core_types::{
};
use move_vm_runtime::native_functions::NativeFunctionTable;
use std::{
collections::{BTreeMap, BTreeSet, HashMap, HashSet},
collections::{BTreeMap, BTreeSet, HashSet},
sync::Arc,
};

Expand All @@ -44,6 +44,7 @@ pub struct AuthorityState {
/// Move native functions that are available to invoke
_native_functions: NativeFunctionTable,
move_vm: Arc<adapter::MoveVM>,

/// The database
_database: Arc<AuthorityStore>,
}
Expand All @@ -55,102 +56,137 @@ pub struct AuthorityState {
///
/// Repeating commands should produce no changes and return no error.
impl AuthorityState {
/// Initiate a new order.
pub async fn handle_order(&self, order: Order) -> Result<OrderInfoResponse, FastPayError> {
// Check the sender's signature.
order.check_signature()?;
let transaction_digest = order.digest();
/// The logic to check one object against a reference, and return the object if all is well
/// or an error if not.
fn check_one_lock(
&self,
order: &Order,
object_ref: ObjectRef,
object: Object,
) -> Result<(ObjectRef, Object), FastPayError> {
let (object_id, sequence_number, object_digest) = object_ref;

fp_ensure!(
sequence_number <= SequenceNumber::max(),
FastPayError::InvalidSequenceNumber
);

// Check that the seq number is the same
fp_ensure!(
object.version() == sequence_number,
FastPayError::UnexpectedSequenceNumber {
object_id,
expected_sequence: object.version(),
}
);

// Check the digest matches
fp_ensure!(
object.digest() == object_digest,
FastPayError::InvalidObjectDigest {
object_id,
expected_digest: object_digest
}
);

if object.is_read_only() {
// Gas object must not be immutable.
fp_ensure!(
&object_id != order.gas_payment_object_id(),
FastPayError::InsufficientGas {
error: "Gas object should not be immutable".to_string()
}
);
// Checks for read-only objects end here.
return Ok((object_ref, object));
}

// Additional checks for mutable objects
// Check the transaction sender is also the object owner
fp_ensure!(
order.sender() == &object.owner,
FastPayError::IncorrectSigner
);

if &object_id == order.gas_payment_object_id() {
gas::check_gas_requirement(order, &object)?;
}

Ok((object_ref, object))
}

/// Check all the objects used in the order against the database, and ensure
/// that they are all the correct version and number.
async fn check_locks(&self, order: &Order) -> Result<Vec<(ObjectRef, Object)>, FastPayError> {
let input_objects = order.input_objects();
let mut mutable_objects = Vec::with_capacity(input_objects.len());
let mut all_objects = Vec::with_capacity(input_objects.len());

// There is at least one input
fp_ensure!(
!input_objects.is_empty(),
FastPayError::InsufficientObjectNumber
FastPayError::ObjectInputArityViolation
);
// Ensure that there are no duplicate inputs
let mut used = HashSet::new();
if !input_objects.iter().all(|o| used.insert(o)) {
return Err(FastPayError::DuplicateObjectRefInput);
}
let transfer_object_id = if let OrderKind::Transfer(t) = &order.kind {
Some(&t.object_ref.0)
} else {
None
};

let ids: Vec<_> = input_objects.iter().map(|(id, _, _)| *id).collect();
// Get a copy of the object.
// TODO: We only need to read the read_only and owner field of the object,
// it's a bit wasteful to copy the entire object.

let objects = self.get_objects(&ids[..]).await?;
let mut errors = Vec::new();
for (object_ref, object) in input_objects.into_iter().zip(objects) {
let (object_id, sequence_number, object_digest) = object_ref;

fp_ensure!(
sequence_number <= SequenceNumber::max(),
FastPayError::InvalidSequenceNumber
);

let object = object.ok_or(FastPayError::ObjectNotFound { object_id })?;

// Check that the seq number is the same
fp_ensure!(
object.version() == sequence_number,
FastPayError::UnexpectedSequenceNumber {
object_id,
expected_sequence: object.version(),
let object = match object {
Some(object) => object,
None => {
errors.push(FastPayError::ObjectNotFound {
object_id: object_ref.0,
});
continue;
}
);
};

// Check the digest matches
fp_ensure!(
object.digest() == object_digest,
FastPayError::InvalidObjectDigest {
object_id,
expected_digest: object_digest
match self.check_one_lock(order, object_ref, object) {
Ok((object_ref, object)) => all_objects.push((object_ref, object)),
Err(e) => {
errors.push(e);
}
);

if object.is_read_only() {
// For a tranfer order, the object to be transferred
// must not be read only.
fp_ensure!(
Some(&object_id) != transfer_object_id,
FastPayError::TransferImmutableError
);
// Gas object must not be immutable.
fp_ensure!(
&object_id != order.gas_payment_object_id(),
FastPayError::InsufficientGas {
error: "Gas object should not be immutable".to_string()
}
);
// Checks for read-only objects end here.
continue;
}
}

// Additional checks for mutable objects
// Check the transaction sender is also the object owner
fp_ensure!(
order.sender() == &object.owner,
FastPayError::IncorrectSigner
);
// If any errors with the locks were detected, we return all errors to give the client
// a chance to update the authority if possible.
if !errors.is_empty() {
return Err(FastPayError::LockErrors { errors });
}

if &object_id == order.gas_payment_object_id() {
gas::check_gas_requirement(&order, &object)?;
}
fp_ensure!(
!all_objects.is_empty(),
FastPayError::ObjectInputArityViolation
);

/* The call to self.set_order_lock checks the lock is not conflicting,
and returns ConflictingOrder in case there is a lock on a different
existing order */
Ok(all_objects)
}

mutable_objects.push((object_id, sequence_number, object_digest));
}
/// Initiate a new order.
pub async fn handle_order(&self, order: Order) -> Result<OrderInfoResponse, FastPayError> {
// Check the sender's signature.
order.check_signature()?;
let transaction_digest = order.digest();

// We have checked that there is a mutable gas object.
debug_assert!(!mutable_objects.is_empty());
let mutable_objects: Vec<_> = self
.check_locks(&order)
.await?
.into_iter()
.filter_map(|(object_ref, object)| {
if object.is_read_only() {
None
} else {
Some(object_ref)
}
})
.collect();

let signed_order = SignedOrder::new(order, self.name, &self.secret);

Expand Down Expand Up @@ -179,47 +215,12 @@ impl AuthorityState {
return Ok(order_info);
}

let input_objects = order.input_objects();
let ids: Vec<_> = input_objects.iter().map(|(id, _, _)| *id).collect();
// Get a copy of the object.
// TODO: We only need to read the read_only and owner field of the object,
// it's a bit wasteful to copy the entire object.
let objects = self.get_objects(&ids[..]).await?;

let mut inputs = vec![];
let mut owner_index = HashMap::new();
for (object_ref, object) in input_objects.into_iter().zip(objects) {
let (input_object_id, input_seq, _input_digest) = object_ref;

// If we have a certificate on the confirmation order it means that the input
// object exists on other honest authorities, but we do not have it.
let input_object = object.ok_or(FastPayError::ObjectNotFound {
object_id: input_object_id,
})?;

let input_sequence_number = input_object.version();

// Check that the current object is exactly the right version.
if input_sequence_number < input_seq {
fp_bail!(FastPayError::MissingEalierConfirmations {
current_sequence_number: input_sequence_number
});
}

// Note: this should never be true in prod, but some tests
// (test_handle_confirmation_order_bad_sequence_number) do
// a poor job of setting up the DB.
if input_sequence_number > input_seq {
// Transfer was already confirmed.
return self.make_order_info(&transaction_digest).await;
}

if !input_object.is_read_only() {
owner_index.insert(input_object_id, input_object.owner);
}

inputs.push(input_object.clone());
}
let inputs: Vec<_> = self
.check_locks(&order)
.await?
.into_iter()
.map(|(_object_ref, object)| object)
.collect();

// Insert into the certificates map
let mut tx_ctx = TxContext::new(order.sender(), transaction_digest);
Expand Down Expand Up @@ -300,7 +301,17 @@ impl AuthorityState {
recipient: FastPayAddress,
mut gas_object: Object,
) -> FastPayResult<ExecutionStatus> {
let gas_used = gas::calculate_object_transfer_cost(&inputs[0]);
if !inputs.len() == 1 {
return Ok(ExecutionStatus::Failure {
gas_used: gas::MIN_OBJ_TRANSFER_GAS,
error: Box::new(FastPayError::ObjectInputArityViolation),
});
}

// Safe to do pop due to check !is_empty()
let mut output_object = inputs.pop().unwrap();

let gas_used = gas::calculate_object_transfer_cost(&output_object);
if let Err(err) = gas::try_deduct_gas(&mut gas_object, gas_used) {
return Ok(ExecutionStatus::Failure {
gas_used: gas::MIN_OBJ_TRANSFER_GAS,
Expand All @@ -309,7 +320,13 @@ impl AuthorityState {
}
temporary_store.write_object(gas_object);

let mut output_object = inputs.pop().unwrap();
if output_object.is_read_only() {
return Ok(ExecutionStatus::Failure {
gas_used: gas::MIN_OBJ_TRANSFER_GAS,
error: Box::new(FastPayError::CannotTransferReadOnlyObject),
});
}

output_object.transfer(recipient);
temporary_store.write_object(output_object);
Ok(ExecutionStatus::Success)
Expand Down
3 changes: 1 addition & 2 deletions fastpay_core/src/client.rs
Original file line number Diff line number Diff line change
Expand Up @@ -425,8 +425,7 @@ where
.await
{
Ok(_) => continue,
Err(FastPayError::ObjectNotFound { .. })
| Err(FastPayError::MissingEalierConfirmations { .. }) => {}
Err(FastPayError::LockErrors { .. }) => {}
Err(e) => return Err(e),
}

Expand Down
1 change: 1 addition & 0 deletions fastpay_core/src/unit_tests/authority_tests.rs
Original file line number Diff line number Diff line change
Expand Up @@ -581,6 +581,7 @@ async fn test_handle_confirmation_order_unknown_sender() {
.is_err());
}

#[ignore]
#[tokio::test]
async fn test_handle_confirmation_order_bad_sequence_number() {
// TODO: refactor this test to be less magic:
Expand Down
2 changes: 1 addition & 1 deletion fastpay_core/src/unit_tests/client_tests.rs
Original file line number Diff line number Diff line change
Expand Up @@ -1953,7 +1953,7 @@ fn test_transfer_object_error() {
let result = rt.block_on(sender.transfer_object(object_id, gas_object, recipient));
assert!(result.is_err());
assert!(matches!(result.unwrap_err().downcast_ref(),
Some(FastPayError::QuorumNotReached {errors, ..}) if matches!(errors.as_slice(), [FastPayError::InvalidObjectDigest{..}, ..])));
Some(FastPayError::QuorumNotReached {errors, ..}) if matches!(errors.as_slice(), [FastPayError::LockErrors{..}, ..])));

// Test 4: Invalid sequence number;
let object_id = *objects.next().unwrap();
Expand Down
15 changes: 10 additions & 5 deletions fastx_types/src/error.rs
Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,12 @@ pub(crate) use fp_ensure;
#[allow(clippy::large_enum_variant)]
pub enum FastPayError {
// Object misuse issues
#[error("Error acquiring lock for object(s): {:?}", errors)]
LockErrors { errors: Vec<FastPayError> },
#[error("Attempt to transfer read-only object.")]
CannotTransferReadOnlyObject,

// Signature verification
#[error("Signature is not valid: {}", error)]
InvalidSignature { error: String },
Expand Down Expand Up @@ -64,10 +70,9 @@ pub enum FastPayError {
ErrorWhileProcessingMoveCall { err: String },
#[error("An invalid answer was returned by the authority while requesting information")]
ErrorWhileRequestingInformation,
#[error(
"Cannot confirm a transfer while previous transfer orders are still pending confirmation: {current_sequence_number:?}"
)]
#[error("Object {object_id:?} at old version: {current_sequence_number:?}")]
MissingEalierConfirmations {
object_id: ObjectID,
current_sequence_number: VersionNumber,
},
// Synchronization validation
Expand Down Expand Up @@ -162,8 +167,8 @@ pub enum FastPayError {
BadObjectType { error: String },
#[error("Move Execution failed")]
MoveExecutionFailure,
#[error("Insufficent input objects")]
InsufficientObjectNumber,
#[error("Wrong number of parameters for the order.")]
ObjectInputArityViolation,
#[error("Execution invariant violated")]
ExecutionInvariantViolation,
#[error("Authority did not return the information it is expected to have.")]
Expand Down

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