iota_transaction_checks/

lib.rs

// Copyright (c) Mysten Labs, Inc.
// Modifications Copyright (c) 2024 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0

pub mod deny;

pub use checked::*;

#[iota_macros::with_checked_arithmetic]
mod checked {
    use std::{
        collections::{BTreeMap, HashSet},
        sync::Arc,
    };

    use iota_config::verifier_signing_config::VerifierSigningConfig;
    use iota_protocol_config::ProtocolConfig;
    use iota_types::{
        IOTA_AUTHENTICATOR_STATE_OBJECT_ID, IOTA_CLOCK_OBJECT_ID, IOTA_CLOCK_OBJECT_SHARED_VERSION,
        IOTA_RANDOMNESS_STATE_OBJECT_ID,
        base_types::{IotaAddress, ObjectID, ObjectRef, SequenceNumber},
        error::{IotaError, IotaResult, UserInputError, UserInputResult},
        executable_transaction::VerifiedExecutableTransaction,
        fp_bail, fp_ensure,
        gas::IotaGasStatus,
        metrics::BytecodeVerifierMetrics,
        object::{Object, Owner},
        transaction::{
            CheckedInputObjects, InputObjectKind, InputObjects, ObjectReadResult,
            ObjectReadResultKind, ReceivingObjectReadResult, ReceivingObjects, TransactionData,
            TransactionDataAPI, TransactionKind,
        },
    };
    use tracing::{error, instrument};

    trait IntoChecked {
        fn into_checked(self) -> CheckedInputObjects;
    }

    impl IntoChecked for InputObjects {
        fn into_checked(self) -> CheckedInputObjects {
            CheckedInputObjects::new_with_checked_transaction_inputs(self)
        }
    }

    // Entry point for all checks related to gas.
    // Called on both signing and execution.
    // On success the gas part of the transaction (gas data and gas coins)
    // is verified and good to go
    pub fn get_gas_status(
        objects: &InputObjects,
        gas: &[ObjectRef],
        protocol_config: &ProtocolConfig,
        reference_gas_price: u64,
        transaction: &TransactionData,
    ) -> IotaResult<IotaGasStatus> {
        check_gas(
            objects,
            protocol_config,
            reference_gas_price,
            gas,
            transaction.gas_budget(),
            transaction.gas_price(),
            transaction.kind(),
        )
    }

    #[instrument(level = "trace", skip_all, fields(tx_digest = ?transaction.digest()))]
    pub fn check_transaction_input(
        protocol_config: &ProtocolConfig,
        reference_gas_price: u64,
        transaction: &TransactionData,
        input_objects: InputObjects,
        receiving_objects: &ReceivingObjects,
        metrics: &Arc<BytecodeVerifierMetrics>,
        verifier_signing_config: &VerifierSigningConfig,
    ) -> IotaResult<(IotaGasStatus, CheckedInputObjects)> {
        let gas_status = check_transaction_input_inner(
            protocol_config,
            reference_gas_price,
            transaction,
            &input_objects,
            &[],
        )?;
        check_receiving_objects(&input_objects, receiving_objects)?;
        // Runs verifier, which could be expensive.
        check_non_system_packages_to_be_published(
            transaction,
            protocol_config,
            metrics,
            verifier_signing_config,
        )?;

        Ok((gas_status, input_objects.into_checked()))
    }

    pub fn check_transaction_input_with_given_gas(
        protocol_config: &ProtocolConfig,
        reference_gas_price: u64,
        transaction: &TransactionData,
        mut input_objects: InputObjects,
        receiving_objects: ReceivingObjects,
        gas_object: Object,
        metrics: &Arc<BytecodeVerifierMetrics>,
        verifier_signing_config: &VerifierSigningConfig,
    ) -> IotaResult<(IotaGasStatus, CheckedInputObjects)> {
        let gas_object_ref = gas_object.compute_object_reference();
        input_objects.push(ObjectReadResult::new_from_gas_object(&gas_object));

        let gas_status = check_transaction_input_inner(
            protocol_config,
            reference_gas_price,
            transaction,
            &input_objects,
            &[gas_object_ref],
        )?;
        check_receiving_objects(&input_objects, &receiving_objects)?;
        // Runs verifier, which could be expensive.
        check_non_system_packages_to_be_published(
            transaction,
            protocol_config,
            metrics,
            verifier_signing_config,
        )?;

        Ok((gas_status, input_objects.into_checked()))
    }

    // Since the purpose of this function is to audit certified transactions,
    // the checks here should be a strict subset of the checks in
    // check_transaction_input(). For checks not performed in this function but
    // in check_transaction_input(), we should add a comment calling out the
    // difference.
    #[instrument(level = "trace", skip_all)]
    pub fn check_certificate_input(
        cert: &VerifiedExecutableTransaction,
        input_objects: InputObjects,
        protocol_config: &ProtocolConfig,
        reference_gas_price: u64,
    ) -> IotaResult<(IotaGasStatus, CheckedInputObjects)> {
        let transaction = cert.data().transaction_data();
        let gas_status = check_transaction_input_inner(
            protocol_config,
            reference_gas_price,
            transaction,
            &input_objects,
            &[],
        )?;
        // NB: We do not check receiving objects when executing. Only at signing time do
        // we check. NB: move verifier is only checked at signing time, not at
        // execution.

        Ok((gas_status, input_objects.into_checked()))
    }

    /// WARNING! This should only be used for the dev-inspect transaction. This
    /// transaction type bypasses many of the normal object checks
    pub fn check_dev_inspect_input(
        config: &ProtocolConfig,
        kind: &TransactionKind,
        input_objects: InputObjects,
        // TODO: check ReceivingObjects for dev inspect?
        _receiving_objects: ReceivingObjects,
    ) -> IotaResult<CheckedInputObjects> {
        kind.validity_check(config)?;
        if kind.is_system_tx() {
            return Err(UserInputError::Unsupported(format!(
                "Transaction kind {kind} is not supported in dev-inspect"
            ))
            .into());
        }
        let mut used_objects: HashSet<IotaAddress> = HashSet::new();
        for input_object in input_objects.iter() {
            let Some(object) = input_object.as_object() else {
                // object was deleted
                continue;
            };

            if !object.is_immutable() {
                fp_ensure!(
                    used_objects.insert(object.id().into()),
                    UserInputError::MutableObjectUsedMoreThanOnce {
                        object_id: object.id()
                    }
                    .into()
                );
            }
        }

        Ok(input_objects.into_checked())
    }

    // Common checks performed for transactions and certificates.
    #[instrument(level = "trace", skip_all)]
    fn check_transaction_input_inner(
        protocol_config: &ProtocolConfig,
        reference_gas_price: u64,
        transaction: &TransactionData,
        input_objects: &InputObjects,
        // Overrides the gas objects in the transaction.
        gas_override: &[ObjectRef],
    ) -> IotaResult<IotaGasStatus> {
        // Cheap validity checks that is ok to run multiple times during processing.
        let gas = if gas_override.is_empty() {
            transaction.gas()
        } else {
            gas_override
        };

        let gas_status = get_gas_status(
            input_objects,
            gas,
            protocol_config,
            reference_gas_price,
            transaction,
        )?;
        check_objects(transaction, input_objects)?;

        Ok(gas_status)
    }

    #[instrument(level = "trace", skip_all)]
    fn check_receiving_objects(
        input_objects: &InputObjects,
        receiving_objects: &ReceivingObjects,
    ) -> Result<(), IotaError> {
        let mut objects_in_txn: HashSet<_> = input_objects
            .object_kinds()
            .map(|x| x.object_id())
            .collect();

        // Since we're at signing we check that every object reference that we are
        // receiving is the most recent version of that object. If it's been
        // received at the version specified we let it through to allow the
        // transaction to run and fail to unlock any other objects in
        // the transaction. Otherwise, we return an error.
        //
        // If there are any object IDs in common (either between receiving objects and
        // input objects) we return an error.
        for ReceivingObjectReadResult {
            object_ref: (object_id, version, object_digest),
            object,
        } in receiving_objects.iter()
        {
            fp_ensure!(
                *version < SequenceNumber::MAX_VALID_EXCL,
                UserInputError::InvalidSequenceNumber.into()
            );

            let Some(object) = object.as_object() else {
                // object was previously received
                continue;
            };

            if !(object.owner.is_address_owned()
                && object.version() == *version
                && object.digest() == *object_digest)
            {
                // Version mismatch
                fp_ensure!(
                    object.version() == *version,
                    UserInputError::ObjectVersionUnavailableForConsumption {
                        provided_obj_ref: (*object_id, *version, *object_digest),
                        current_version: object.version(),
                    }
                    .into()
                );

                // Tried to receive a package
                fp_ensure!(
                    !object.is_package(),
                    UserInputError::MovePackageAsObject {
                        object_id: *object_id
                    }
                    .into()
                );

                // Digest mismatch
                let expected_digest = object.digest();
                fp_ensure!(
                    expected_digest == *object_digest,
                    UserInputError::InvalidObjectDigest {
                        object_id: *object_id,
                        expected_digest
                    }
                    .into()
                );

                match object.owner {
                    Owner::AddressOwner(_) => {
                        debug_assert!(
                            false,
                            "Receiving object {:?} is invalid but we expect it should be valid. {:?}",
                            (*object_id, *version, *object_id),
                            object
                        );
                        error!(
                            "Receiving object {:?} is invalid but we expect it should be valid. {:?}",
                            (*object_id, *version, *object_id),
                            object
                        );
                        // We should never get here, but if for some reason we do just default to
                        // object not found and reject signing the transaction.
                        fp_bail!(
                            UserInputError::ObjectNotFound {
                                object_id: *object_id,
                                version: Some(*version),
                            }
                            .into()
                        )
                    }
                    Owner::ObjectOwner(owner) => {
                        fp_bail!(
                            UserInputError::InvalidChildObjectArgument {
                                child_id: object.id(),
                                parent_id: owner.into(),
                            }
                            .into()
                        )
                    }
                    Owner::Shared { .. } => fp_bail!(UserInputError::NotSharedObject.into()),
                    Owner::Immutable => fp_bail!(
                        UserInputError::MutableParameterExpected {
                            object_id: *object_id
                        }
                        .into()
                    ),
                };
            }

            fp_ensure!(
                !objects_in_txn.contains(object_id),
                UserInputError::DuplicateObjectRefInput.into()
            );

            objects_in_txn.insert(*object_id);
        }
        Ok(())
    }

    /// Check transaction gas data/info and gas coins consistency.
    /// Return the gas status to be used for the lifecycle of the transaction.
    #[instrument(level = "trace", skip_all)]
    fn check_gas(
        objects: &InputObjects,
        protocol_config: &ProtocolConfig,
        reference_gas_price: u64,
        gas: &[ObjectRef],
        gas_budget: u64,
        gas_price: u64,
        tx_kind: &TransactionKind,
    ) -> IotaResult<IotaGasStatus> {
        if tx_kind.is_system_tx() {
            Ok(IotaGasStatus::new_unmetered())
        } else {
            let gas_status =
                IotaGasStatus::new(gas_budget, gas_price, reference_gas_price, protocol_config)?;

            // check balance and coins consistency
            // load all gas coins
            let objects: BTreeMap<_, _> = objects.iter().map(|o| (o.id(), o)).collect();
            let mut gas_objects = vec![];
            for obj_ref in gas {
                let obj = objects.get(&obj_ref.0);
                let obj = *obj.ok_or(UserInputError::ObjectNotFound {
                    object_id: obj_ref.0,
                    version: Some(obj_ref.1),
                })?;
                gas_objects.push(obj);
            }
            gas_status.check_gas_balance(&gas_objects, gas_budget)?;
            Ok(gas_status)
        }
    }

    /// Check all the objects used in the transaction against the database, and
    /// ensure that they are all the correct version and number.
    #[instrument(level = "trace", skip_all)]
    fn check_objects(transaction: &TransactionData, objects: &InputObjects) -> UserInputResult<()> {
        // We require that mutable objects cannot show up more than once.
        let mut used_objects: HashSet<IotaAddress> = HashSet::new();
        for object in objects.iter() {
            if object.is_mutable() {
                fp_ensure!(
                    used_objects.insert(object.id().into()),
                    UserInputError::MutableObjectUsedMoreThanOnce {
                        object_id: object.id()
                    }
                );
            }
        }

        if !transaction.is_genesis_tx() && objects.is_empty() {
            return Err(UserInputError::ObjectInputArityViolation);
        }

        let gas_coins: HashSet<ObjectID> =
            HashSet::from_iter(transaction.gas().iter().map(|obj_ref| obj_ref.0));
        for object in objects.iter() {
            let input_object_kind = object.input_object_kind;

            match &object.object {
                ObjectReadResultKind::Object(object) => {
                    // For Gas Object, we check the object is owned by gas owner
                    let owner_address = if gas_coins.contains(&object.id()) {
                        transaction.gas_owner()
                    } else {
                        transaction.sender()
                    };
                    // Check if the object contents match the type of lock we need for
                    // this object.
                    let system_transaction = transaction.is_system_tx();
                    check_one_object(
                        &owner_address,
                        input_object_kind,
                        object,
                        system_transaction,
                    )?;
                }
                // We skip checking a deleted shared object because it no longer exists
                ObjectReadResultKind::DeletedSharedObject(_, _) => (),
                // We skip checking shared objects from cancelled transactions since we are not
                // reading it.
                ObjectReadResultKind::CancelledTransactionSharedObject(_) => (),
            }
        }

        Ok(())
    }

    /// Check one object against a reference
    fn check_one_object(
        owner: &IotaAddress,
        object_kind: InputObjectKind,
        object: &Object,
        system_transaction: bool,
    ) -> UserInputResult {
        match object_kind {
            InputObjectKind::MovePackage(package_id) => {
                fp_ensure!(
                    object.data.try_as_package().is_some(),
                    UserInputError::MoveObjectAsPackage {
                        object_id: package_id
                    }
                );
            }
            InputObjectKind::ImmOrOwnedMoveObject((object_id, sequence_number, object_digest)) => {
                fp_ensure!(
                    !object.is_package(),
                    UserInputError::MovePackageAsObject { object_id }
                );
                fp_ensure!(
                    sequence_number < SequenceNumber::MAX_VALID_EXCL,
                    UserInputError::InvalidSequenceNumber
                );

                // This is an invariant - we just load the object with the given ID and version.
                assert_eq!(
                    object.version(),
                    sequence_number,
                    "The fetched object version {} does not match the requested version {}, object id: {}",
                    object.version(),
                    sequence_number,
                    object.id(),
                );

                // Check the digest matches - user could give a mismatched ObjectDigest
                let expected_digest = object.digest();
                fp_ensure!(
                    expected_digest == object_digest,
                    UserInputError::InvalidObjectDigest {
                        object_id,
                        expected_digest
                    }
                );

                match object.owner {
                    Owner::Immutable => {
                        // Nothing else to check for Immutable.
                    }
                    Owner::AddressOwner(actual_owner) => {
                        // Check the owner is correct.
                        fp_ensure!(
                            owner == &actual_owner,
                            UserInputError::IncorrectUserSignature {
                                error: format!(
                                    "Object {object_id:?} is owned by account address {actual_owner:?}, but given owner/signer address is {owner:?}"
                                ),
                            }
                        );
                    }
                    Owner::ObjectOwner(owner) => {
                        return Err(UserInputError::InvalidChildObjectArgument {
                            child_id: object.id(),
                            parent_id: owner.into(),
                        });
                    }
                    Owner::Shared { .. } => {
                        // This object is a mutable shared object. However the transaction
                        // specifies it as an owned object. This is inconsistent.
                        return Err(UserInputError::NotSharedObject);
                    }
                };
            }
            InputObjectKind::SharedMoveObject {
                id: IOTA_CLOCK_OBJECT_ID,
                initial_shared_version: IOTA_CLOCK_OBJECT_SHARED_VERSION,
                mutable: true,
            } => {
                // Only system transactions can accept the Clock
                // object as a mutable parameter.
                if system_transaction {
                    return Ok(());
                } else {
                    return Err(UserInputError::ImmutableParameterExpected {
                        object_id: IOTA_CLOCK_OBJECT_ID,
                    });
                }
            }
            InputObjectKind::SharedMoveObject {
                id: IOTA_AUTHENTICATOR_STATE_OBJECT_ID,
                ..
            } => {
                if system_transaction {
                    return Ok(());
                } else {
                    return Err(UserInputError::InaccessibleSystemObject {
                        object_id: IOTA_AUTHENTICATOR_STATE_OBJECT_ID,
                    });
                }
            }
            InputObjectKind::SharedMoveObject {
                id: IOTA_RANDOMNESS_STATE_OBJECT_ID,
                mutable: true,
                ..
            } => {
                // Only system transactions can accept the Random
                // object as a mutable parameter.
                if system_transaction {
                    return Ok(());
                } else {
                    return Err(UserInputError::ImmutableParameterExpected {
                        object_id: IOTA_RANDOMNESS_STATE_OBJECT_ID,
                    });
                }
            }
            InputObjectKind::SharedMoveObject {
                initial_shared_version: input_initial_shared_version,
                ..
            } => {
                fp_ensure!(
                    object.version() < SequenceNumber::MAX_VALID_EXCL,
                    UserInputError::InvalidSequenceNumber
                );

                match object.owner {
                    Owner::AddressOwner(_) | Owner::ObjectOwner(_) | Owner::Immutable => {
                        // When someone locks an object as shared it must be shared already.
                        return Err(UserInputError::NotSharedObject);
                    }
                    Owner::Shared {
                        initial_shared_version: actual_initial_shared_version,
                    } => {
                        fp_ensure!(
                            input_initial_shared_version == actual_initial_shared_version,
                            UserInputError::SharedObjectStartingVersionMismatch
                        )
                    }
                }
            }
        };
        Ok(())
    }

    /// Check package verification timeout
    #[instrument(level = "trace", skip_all)]
    pub fn check_non_system_packages_to_be_published(
        transaction: &TransactionData,
        protocol_config: &ProtocolConfig,
        metrics: &Arc<BytecodeVerifierMetrics>,
        verifier_signing_config: &VerifierSigningConfig,
    ) -> UserInputResult<()> {
        // Only meter non-system programmable transaction blocks
        if transaction.is_system_tx() {
            return Ok(());
        }

        let TransactionKind::ProgrammableTransaction(pt) = transaction.kind() else {
            return Ok(());
        };

        // Use the same verifier and meter for all packages, custom configured for
        // signing.
        let signing_limits = Some(verifier_signing_config.limits_for_signing());
        let mut verifier = iota_execution::verifier(protocol_config, signing_limits, metrics);
        let mut meter = verifier.meter(verifier_signing_config.meter_config_for_signing());

        // Measure time for verifying all packages in the PTB
        let shared_meter_verifier_timer = metrics
            .verifier_runtime_per_ptb_success_latency
            .start_timer();

        let verifier_status = pt
            .non_system_packages_to_be_published()
            .try_for_each(|module_bytes| {
                verifier.meter_module_bytes(protocol_config, module_bytes, meter.as_mut())
            })
            .map_err(|e| UserInputError::PackageVerificationTimedout { err: e.to_string() });

        match verifier_status {
            Ok(_) => {
                // Success: stop and record the success timer
                shared_meter_verifier_timer.stop_and_record();
            }
            Err(err) => {
                // Failure: redirect the success timers output to the failure timer and
                // discard the success timer
                metrics
                    .verifier_runtime_per_ptb_timeout_latency
                    .observe(shared_meter_verifier_timer.stop_and_discard());
                return Err(err);
            }
        };

        Ok(())
    }
}