Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- GnosisSafe
- Optimization enabled
- false
- Compiler version
- v0.5.17+commit.d19bba13
- EVM Version
- default
- Verified at
- 2024-07-10T16:14:42.785134Z
.sol
pragma solidity >=0.5.0 <0.7.0;
/// @title SelfAuthorized - authorizes current contract to perform actions
/// @author Richard Meissner - <[email protected]>
contract SelfAuthorized {
modifier authorized() {
require(msg.sender == address(this), "Method can only be called from this contract");
_;
}
}
/// @title Enum - Collection of enums
/// @author Richard Meissner - <[email protected]>
contract Enum {
enum Operation {
Call,
DelegateCall
}
}
contract ISignatureValidatorConstants {
// bytes4(keccak256("isValidSignature(bytes,bytes)")
bytes4 constant internal EIP1271_MAGIC_VALUE = 0x20c13b0b;
}
contract ISignatureValidator is ISignatureValidatorConstants {
/**
* @dev Should return whether the signature provided is valid for the provided data
* @param _data Arbitrary length data signed on the behalf of address(this)
* @param _signature Signature byte array associated with _data
*
* MUST return the bytes4 magic value 0x20c13b0b when function passes.
* MUST NOT modify state (using STATICCALL for solc < 0.5, view modifier for solc > 0.5)
* MUST allow external calls
*/
function isValidSignature(
bytes memory _data,
bytes memory _signature)
public
view
returns (bytes4);
}
/**
* @title GnosisSafeMath
* @dev Math operations with safety checks that revert on error
* Renamed from SafeMath to GnosisSafeMath to avoid conflicts
* TODO: remove once open zeppelin update to solc 0.5.0
*/
library GnosisSafeMath {
/**
* @dev Multiplies two numbers, reverts on overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b);
return c;
}
/**
* @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0); // Solidity only automatically asserts when dividing by 0
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a);
uint256 c = a - b;
return c;
}
/**
* @dev Adds two numbers, reverts on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a);
return c;
}
/**
* @dev Divides two numbers and returns the remainder (unsigned integer modulo),
* reverts when dividing by zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b != 0);
return a % b;
}
/**
* @dev Returns the largest of two numbers.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256) {
return a >= b ? a : b;
}
}
/// @title SignatureDecoder - Decodes signatures that a encoded as bytes
/// @author Ricardo Guilherme Schmidt (Status Research & Development GmbH)
/// @author Richard Meissner - <[email protected]>
contract SignatureDecoder {
/// @dev Recovers address who signed the message
/// @param messageHash operation ethereum signed message hash
/// @param messageSignature message `txHash` signature
/// @param pos which signature to read
function recoverKey (
bytes32 messageHash,
bytes memory messageSignature,
uint256 pos
)
internal
pure
returns (address)
{
uint8 v;
bytes32 r;
bytes32 s;
(v, r, s) = signatureSplit(messageSignature, pos);
return ecrecover(messageHash, v, r, s);
}
/// @dev divides bytes signature into `uint8 v, bytes32 r, bytes32 s`.
/// @notice Make sure to peform a bounds check for @param pos, to avoid out of bounds access on @param signatures
/// @param pos which signature to read. A prior bounds check of this parameter should be performed, to avoid out of bounds access
/// @param signatures concatenated rsv signatures
function signatureSplit(bytes memory signatures, uint256 pos)
internal
pure
returns (uint8 v, bytes32 r, bytes32 s)
{
// The signature format is a compact form of:
// {bytes32 r}{bytes32 s}{uint8 v}
// Compact means, uint8 is not padded to 32 bytes.
// solium-disable-next-line security/no-inline-assembly
assembly {
let signaturePos := mul(0x41, pos)
r := mload(add(signatures, add(signaturePos, 0x20)))
s := mload(add(signatures, add(signaturePos, 0x40)))
// Here we are loading the last 32 bytes, including 31 bytes
// of 's'. There is no 'mload8' to do this.
//
// 'byte' is not working due to the Solidity parser, so lets
// use the second best option, 'and'
v := and(mload(add(signatures, add(signaturePos, 0x41))), 0xff)
}
}
}
/// @title SecuredTokenTransfer - Secure token transfer
/// @author Richard Meissner - <[email protected]>
contract SecuredTokenTransfer {
/// @dev Transfers a token and returns if it was a success
/// @param token Token that should be transferred
/// @param receiver Receiver to whom the token should be transferred
/// @param amount The amount of tokens that should be transferred
function transferToken (
address token,
address receiver,
uint256 amount
)
internal
returns (bool transferred)
{
bytes memory data = abi.encodeWithSignature("transfer(address,uint256)", receiver, amount);
// solium-disable-next-line security/no-inline-assembly
assembly {
let success := call(sub(gas, 10000), token, 0, add(data, 0x20), mload(data), 0, 0)
let ptr := mload(0x40)
mstore(0x40, add(ptr, returndatasize()))
returndatacopy(ptr, 0, returndatasize())
switch returndatasize()
case 0 { transferred := success }
case 0x20 { transferred := iszero(or(iszero(success), iszero(mload(ptr)))) }
default { transferred := 0 }
}
}
}
/// @title MasterCopy - Base for master copy contracts (should always be first super contract)
/// This contract is tightly coupled to our proxy contract (see `proxies/GnosisSafeProxy.sol`)
/// @author Richard Meissner - <[email protected]>
contract MasterCopy is SelfAuthorized {
event ChangedMasterCopy(address masterCopy);
// masterCopy always needs to be first declared variable, to ensure that it is at the same location as in the Proxy contract.
// It should also always be ensured that the address is stored alone (uses a full word)
address private masterCopy;
/// @dev Allows to upgrade the contract. This can only be done via a Safe transaction.
/// @param _masterCopy New contract address.
function changeMasterCopy(address _masterCopy)
public
authorized
{
// Master copy address cannot be null.
require(_masterCopy != address(0), "Invalid master copy address provided");
masterCopy = _masterCopy;
emit ChangedMasterCopy(_masterCopy);
}
}
/// @title OwnerManager - Manages a set of owners and a threshold to perform actions.
/// @author Stefan George - <[email protected]>
/// @author Richard Meissner - <[email protected]>
contract OwnerManager is SelfAuthorized {
event AddedOwner(address owner);
event RemovedOwner(address owner);
event ChangedThreshold(uint256 threshold);
address internal constant SENTINEL_OWNERS = address(0x1);
mapping(address => address) internal owners;
uint256 ownerCount;
uint256 internal threshold;
/// @dev Setup function sets initial storage of contract.
/// @param _owners List of Safe owners.
/// @param _threshold Number of required confirmations for a Safe transaction.
function setupOwners(address[] memory _owners, uint256 _threshold)
internal
{
// Threshold can only be 0 at initialization.
// Check ensures that setup function can only be called once.
require(threshold == 0, "Owners have already been setup");
// Validate that threshold is smaller than number of added owners.
require(_threshold <= _owners.length, "Threshold cannot exceed owner count");
// There has to be at least one Safe owner.
require(_threshold >= 1, "Threshold needs to be greater than 0");
// Initializing Safe owners.
address currentOwner = SENTINEL_OWNERS;
for (uint256 i = 0; i < _owners.length; i++) {
// Owner address cannot be null.
address owner = _owners[i];
require(owner != address(0) && owner != SENTINEL_OWNERS, "Invalid owner address provided");
// No duplicate owners allowed.
require(owners[owner] == address(0), "Duplicate owner address provided");
owners[currentOwner] = owner;
currentOwner = owner;
}
owners[currentOwner] = SENTINEL_OWNERS;
ownerCount = _owners.length;
threshold = _threshold;
}
/// @dev Allows to add a new owner to the Safe and update the threshold at the same time.
/// This can only be done via a Safe transaction.
/// @notice Adds the owner `owner` to the Safe and updates the threshold to `_threshold`.
/// @param owner New owner address.
/// @param _threshold New threshold.
function addOwnerWithThreshold(address owner, uint256 _threshold)
public
authorized
{
// Owner address cannot be null.
require(owner != address(0) && owner != SENTINEL_OWNERS, "Invalid owner address provided");
// No duplicate owners allowed.
require(owners[owner] == address(0), "Address is already an owner");
owners[owner] = owners[SENTINEL_OWNERS];
owners[SENTINEL_OWNERS] = owner;
ownerCount++;
emit AddedOwner(owner);
// Change threshold if threshold was changed.
if (threshold != _threshold)
changeThreshold(_threshold);
}
/// @dev Allows to remove an owner from the Safe and update the threshold at the same time.
/// This can only be done via a Safe transaction.
/// @notice Removes the owner `owner` from the Safe and updates the threshold to `_threshold`.
/// @param prevOwner Owner that pointed to the owner to be removed in the linked list
/// @param owner Owner address to be removed.
/// @param _threshold New threshold.
function removeOwner(address prevOwner, address owner, uint256 _threshold)
public
authorized
{
// Only allow to remove an owner, if threshold can still be reached.
require(ownerCount - 1 >= _threshold, "New owner count needs to be larger than new threshold");
// Validate owner address and check that it corresponds to owner index.
require(owner != address(0) && owner != SENTINEL_OWNERS, "Invalid owner address provided");
require(owners[prevOwner] == owner, "Invalid prevOwner, owner pair provided");
owners[prevOwner] = owners[owner];
owners[owner] = address(0);
ownerCount--;
emit RemovedOwner(owner);
// Change threshold if threshold was changed.
if (threshold != _threshold)
changeThreshold(_threshold);
}
/// @dev Allows to swap/replace an owner from the Safe with another address.
/// This can only be done via a Safe transaction.
/// @notice Replaces the owner `oldOwner` in the Safe with `newOwner`.
/// @param prevOwner Owner that pointed to the owner to be replaced in the linked list
/// @param oldOwner Owner address to be replaced.
/// @param newOwner New owner address.
function swapOwner(address prevOwner, address oldOwner, address newOwner)
public
authorized
{
// Owner address cannot be null.
require(newOwner != address(0) && newOwner != SENTINEL_OWNERS, "Invalid owner address provided");
// No duplicate owners allowed.
require(owners[newOwner] == address(0), "Address is already an owner");
// Validate oldOwner address and check that it corresponds to owner index.
require(oldOwner != address(0) && oldOwner != SENTINEL_OWNERS, "Invalid owner address provided");
require(owners[prevOwner] == oldOwner, "Invalid prevOwner, owner pair provided");
owners[newOwner] = owners[oldOwner];
owners[prevOwner] = newOwner;
owners[oldOwner] = address(0);
emit RemovedOwner(oldOwner);
emit AddedOwner(newOwner);
}
/// @dev Allows to update the number of required confirmations by Safe owners.
/// This can only be done via a Safe transaction.
/// @notice Changes the threshold of the Safe to `_threshold`.
/// @param _threshold New threshold.
function changeThreshold(uint256 _threshold)
public
authorized
{
// Validate that threshold is smaller than number of owners.
require(_threshold <= ownerCount, "Threshold cannot exceed owner count");
// There has to be at least one Safe owner.
require(_threshold >= 1, "Threshold needs to be greater than 0");
threshold = _threshold;
emit ChangedThreshold(threshold);
}
function getThreshold()
public
view
returns (uint256)
{
return threshold;
}
function isOwner(address owner)
public
view
returns (bool)
{
return owner != SENTINEL_OWNERS && owners[owner] != address(0);
}
/// @dev Returns array of owners.
/// @return Array of Safe owners.
function getOwners()
public
view
returns (address[] memory)
{
address[] memory array = new address[](ownerCount);
// populate return array
uint256 index = 0;
address currentOwner = owners[SENTINEL_OWNERS];
while(currentOwner != SENTINEL_OWNERS) {
array[index] = currentOwner;
currentOwner = owners[currentOwner];
index ++;
}
return array;
}
}
/// @title Executor - A contract that can execute transactions
/// @author Richard Meissner - <[email protected]>
contract Executor {
function execute(address to, uint256 value, bytes memory data, Enum.Operation operation, uint256 txGas)
internal
returns (bool success)
{
if (operation == Enum.Operation.Call)
success = executeCall(to, value, data, txGas);
else if (operation == Enum.Operation.DelegateCall)
success = executeDelegateCall(to, data, txGas);
else
success = false;
}
function executeCall(address to, uint256 value, bytes memory data, uint256 txGas)
internal
returns (bool success)
{
// solium-disable-next-line security/no-inline-assembly
assembly {
success := call(txGas, to, value, add(data, 0x20), mload(data), 0, 0)
}
}
function executeDelegateCall(address to, bytes memory data, uint256 txGas)
internal
returns (bool success)
{
// solium-disable-next-line security/no-inline-assembly
assembly {
success := delegatecall(txGas, to, add(data, 0x20), mload(data), 0, 0)
}
}
}
/// @title Module Manager - A contract that manages modules that can execute transactions via this contract
/// @author Stefan George - <[email protected]>
/// @author Richard Meissner - <[email protected]>
contract ModuleManager is SelfAuthorized, Executor {
event EnabledModule(Module module);
event DisabledModule(Module module);
event ExecutionFromModuleSuccess(address indexed module);
event ExecutionFromModuleFailure(address indexed module);
address internal constant SENTINEL_MODULES = address(0x1);
mapping (address => address) internal modules;
function setupModules(address to, bytes memory data)
internal
{
require(modules[SENTINEL_MODULES] == address(0), "Modules have already been initialized");
modules[SENTINEL_MODULES] = SENTINEL_MODULES;
if (to != address(0))
// Setup has to complete successfully or transaction fails.
require(executeDelegateCall(to, data, gasleft()), "Could not finish initialization");
}
/// @dev Allows to add a module to the whitelist.
/// This can only be done via a Safe transaction.
/// @notice Enables the module `module` for the Safe.
/// @param module Module to be whitelisted.
function enableModule(Module module)
public
authorized
{
// Module address cannot be null or sentinel.
require(address(module) != address(0) && address(module) != SENTINEL_MODULES, "Invalid module address provided");
// Module cannot be added twice.
require(modules[address(module)] == address(0), "Module has already been added");
modules[address(module)] = modules[SENTINEL_MODULES];
modules[SENTINEL_MODULES] = address(module);
emit EnabledModule(module);
}
/// @dev Allows to remove a module from the whitelist.
/// This can only be done via a Safe transaction.
/// @notice Disables the module `module` for the Safe.
/// @param prevModule Module that pointed to the module to be removed in the linked list
/// @param module Module to be removed.
function disableModule(Module prevModule, Module module)
public
authorized
{
// Validate module address and check that it corresponds to module index.
require(address(module) != address(0) && address(module) != SENTINEL_MODULES, "Invalid module address provided");
require(modules[address(prevModule)] == address(module), "Invalid prevModule, module pair provided");
modules[address(prevModule)] = modules[address(module)];
modules[address(module)] = address(0);
emit DisabledModule(module);
}
/// @dev Allows a Module to execute a Safe transaction without any further confirmations.
/// @param to Destination address of module transaction.
/// @param value Ether value of module transaction.
/// @param data Data payload of module transaction.
/// @param operation Operation type of module transaction.
function execTransactionFromModule(address to, uint256 value, bytes memory data, Enum.Operation operation)
public
returns (bool success)
{
// Only whitelisted modules are allowed.
require(msg.sender != SENTINEL_MODULES && modules[msg.sender] != address(0), "Method can only be called from an enabled module");
// Execute transaction without further confirmations.
success = execute(to, value, data, operation, gasleft());
if (success) emit ExecutionFromModuleSuccess(msg.sender);
else emit ExecutionFromModuleFailure(msg.sender);
}
/// @dev Allows a Module to execute a Safe transaction without any further confirmations and return data
/// @param to Destination address of module transaction.
/// @param value Ether value of module transaction.
/// @param data Data payload of module transaction.
/// @param operation Operation type of module transaction.
function execTransactionFromModuleReturnData(address to, uint256 value, bytes memory data, Enum.Operation operation)
public
returns (bool success, bytes memory returnData)
{
success = execTransactionFromModule(to, value, data, operation);
// solium-disable-next-line security/no-inline-assembly
assembly {
// Load free memory location
let ptr := mload(0x40)
// We allocate memory for the return data by setting the free memory location to
// current free memory location + data size + 32 bytes for data size value
mstore(0x40, add(ptr, add(returndatasize(), 0x20)))
// Store the size
mstore(ptr, returndatasize())
// Store the data
returndatacopy(add(ptr, 0x20), 0, returndatasize())
// Point the return data to the correct memory location
returnData := ptr
}
}
/// @dev Returns if an module is enabled
/// @return True if the module is enabled
function isModuleEnabled(Module module)
public
view
returns (bool)
{
return SENTINEL_MODULES != address(module) && modules[address(module)] != address(0);
}
/// @dev Returns array of first 10 modules.
/// @return Array of modules.
function getModules()
public
view
returns (address[] memory)
{
(address[] memory array,) = getModulesPaginated(SENTINEL_MODULES, 10);
return array;
}
/// @dev Returns array of modules.
/// @param start Start of the page.
/// @param pageSize Maximum number of modules that should be returned.
/// @return Array of modules.
function getModulesPaginated(address start, uint256 pageSize)
public
view
returns (address[] memory array, address next)
{
// Init array with max page size
array = new address[](pageSize);
// Populate return array
uint256 moduleCount = 0;
address currentModule = modules[start];
while(currentModule != address(0x0) && currentModule != SENTINEL_MODULES && moduleCount < pageSize) {
array[moduleCount] = currentModule;
currentModule = modules[currentModule];
moduleCount++;
}
next = currentModule;
// Set correct size of returned array
// solium-disable-next-line security/no-inline-assembly
assembly {
mstore(array, moduleCount)
}
}
}
/// @title Module - Base class for modules.
/// @author Stefan George - <[email protected]>
/// @author Richard Meissner - <[email protected]>
contract Module is MasterCopy {
ModuleManager public manager;
modifier authorized() {
require(msg.sender == address(manager), "Method can only be called from manager");
_;
}
function setManager()
internal
{
// manager can only be 0 at initalization of contract.
// Check ensures that setup function can only be called once.
require(address(manager) == address(0), "Manager has already been set");
manager = ModuleManager(msg.sender);
}
}
/// @title Fallback Manager - A contract that manages fallback calls made to this contract
/// @author Richard Meissner - <[email protected]>
contract FallbackManager is SelfAuthorized {
// keccak256("fallback_manager.handler.address")
bytes32 internal constant FALLBACK_HANDLER_STORAGE_SLOT = 0x6c9a6c4a39284e37ed1cf53d337577d14212a4870fb976a4366c693b939918d5;
function internalSetFallbackHandler(address handler) internal {
bytes32 slot = FALLBACK_HANDLER_STORAGE_SLOT;
// solium-disable-next-line security/no-inline-assembly
assembly {
sstore(slot, handler)
}
}
/// @dev Allows to add a contract to handle fallback calls.
/// Only fallback calls without value and with data will be forwarded.
/// This can only be done via a Safe transaction.
/// @param handler contract to handle fallbacks calls.
function setFallbackHandler(address handler)
public
authorized
{
internalSetFallbackHandler(handler);
}
function ()
external
payable
{
// Only calls without value and with data will be forwarded
if (msg.value > 0 || msg.data.length == 0) {
return;
}
bytes32 slot = FALLBACK_HANDLER_STORAGE_SLOT;
address handler;
// solium-disable-next-line security/no-inline-assembly
assembly {
handler := sload(slot)
}
if (handler != address(0)) {
// solium-disable-next-line security/no-inline-assembly
assembly {
calldatacopy(0, 0, calldatasize())
let success := call(gas, handler, 0, 0, calldatasize(), 0, 0)
returndatacopy(0, 0, returndatasize())
if eq(success, 0) { revert(0, returndatasize()) }
return(0, returndatasize())
}
}
}
}
/// @title Gnosis Safe - A multisignature wallet with support for confirmations using signed messages based on ERC191.
/// @author Stefan George - <[email protected]>
/// @author Richard Meissner - <[email protected]>
/// @author Ricardo Guilherme Schmidt - (Status Research & Development GmbH) - Gas Token Payment
contract GnosisSafe
is MasterCopy, ModuleManager, OwnerManager, SignatureDecoder, SecuredTokenTransfer, ISignatureValidatorConstants, FallbackManager {
using GnosisSafeMath for uint256;
string public constant NAME = "Gnosis Safe";
string public constant VERSION = "1.2.0";
//keccak256(
// "EIP712Domain(address verifyingContract)"
//);
bytes32 private constant DOMAIN_SEPARATOR_TYPEHASH = 0x035aff83d86937d35b32e04f0ddc6ff469290eef2f1b692d8a815c89404d4749;
//keccak256(
// "SafeTx(address to,uint256 value,bytes data,uint8 operation,uint256 safeTxGas,uint256 baseGas,uint256 gasPrice,address gasToken,address refundReceiver,uint256 nonce)"
//);
bytes32 private constant SAFE_TX_TYPEHASH = 0xbb8310d486368db6bd6f849402fdd73ad53d316b5a4b2644ad6efe0f941286d8;
//keccak256(
// "SafeMessage(bytes message)"
//);
bytes32 private constant SAFE_MSG_TYPEHASH = 0x60b3cbf8b4a223d68d641b3b6ddf9a298e7f33710cf3d3a9d1146b5a6150fbca;
event ApproveHash(
bytes32 indexed approvedHash,
address indexed owner
);
event SignMsg(
bytes32 indexed msgHash
);
event ExecutionFailure(
bytes32 txHash, uint256 payment
);
event ExecutionSuccess(
bytes32 txHash, uint256 payment
);
uint256 public nonce;
bytes32 public domainSeparator;
// Mapping to keep track of all message hashes that have been approve by ALL REQUIRED owners
mapping(bytes32 => uint256) public signedMessages;
// Mapping to keep track of all hashes (message or transaction) that have been approve by ANY owners
mapping(address => mapping(bytes32 => uint256)) public approvedHashes;
// This constructor ensures that this contract can only be used as a master copy for Proxy contracts
constructor() public {
// By setting the threshold it is not possible to call setup anymore,
// so we create a Safe with 0 owners and threshold 1.
// This is an unusable Safe, perfect for the mastercopy
threshold = 1;
}
/// @dev Setup function sets initial storage of contract.
/// @param _owners List of Safe owners.
/// @param _threshold Number of required confirmations for a Safe transaction.
/// @param to Contract address for optional delegate call.
/// @param data Data payload for optional delegate call.
/// @param fallbackHandler Handler for fallback calls to this contract
/// @param paymentToken Token that should be used for the payment (0 is ETH)
/// @param payment Value that should be paid
/// @param paymentReceiver Adddress that should receive the payment (or 0 if tx.origin)
function setup(
address[] calldata _owners,
uint256 _threshold,
address to,
bytes calldata data,
address fallbackHandler,
address paymentToken,
uint256 payment,
address payable paymentReceiver
)
external
{
require(domainSeparator == 0, "Domain Separator already set!");
domainSeparator = keccak256(abi.encode(DOMAIN_SEPARATOR_TYPEHASH, this));
setupOwners(_owners, _threshold);
if (fallbackHandler != address(0)) internalSetFallbackHandler(fallbackHandler);
// As setupOwners can only be called if the contract has not been initialized we don't need a check for setupModules
setupModules(to, data);
if (payment > 0) {
// To avoid running into issues with EIP-170 we reuse the handlePayment function (to avoid adjusting code of that has been verified we do not adjust the method itself)
// baseGas = 0, gasPrice = 1 and gas = payment => amount = (payment + 0) * 1 = payment
handlePayment(payment, 0, 1, paymentToken, paymentReceiver);
}
}
/// @dev Allows to execute a Safe transaction confirmed by required number of owners and then pays the account that submitted the transaction.
/// Note: The fees are always transfered, even if the user transaction fails.
/// @param to Destination address of Safe transaction.
/// @param value Ether value of Safe transaction.
/// @param data Data payload of Safe transaction.
/// @param operation Operation type of Safe transaction.
/// @param safeTxGas Gas that should be used for the Safe transaction.
/// @param baseGas Gas costs for that are indipendent of the transaction execution(e.g. base transaction fee, signature check, payment of the refund)
/// @param gasPrice Gas price that should be used for the payment calculation.
/// @param gasToken Token address (or 0 if ETH) that is used for the payment.
/// @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin).
/// @param signatures Packed signature data ({bytes32 r}{bytes32 s}{uint8 v})
function execTransaction(
address to,
uint256 value,
bytes calldata data,
Enum.Operation operation,
uint256 safeTxGas,
uint256 baseGas,
uint256 gasPrice,
address gasToken,
address payable refundReceiver,
bytes calldata signatures
)
external
payable
returns (bool success)
{
bytes32 txHash;
// Use scope here to limit variable lifetime and prevent `stack too deep` errors
{
bytes memory txHashData = encodeTransactionData(
to, value, data, operation, // Transaction info
safeTxGas, baseGas, gasPrice, gasToken, refundReceiver, // Payment info
nonce
);
// Increase nonce and execute transaction.
nonce++;
txHash = keccak256(txHashData);
checkSignatures(txHash, txHashData, signatures, true);
}
// We require some gas to emit the events (at least 2500) after the execution and some to perform code until the execution (500)
// We also include the 1/64 in the check that is not send along with a call to counteract potential shortings because of EIP-150
require(gasleft() >= (safeTxGas * 64 / 63).max(safeTxGas + 2500) + 500, "Not enough gas to execute safe transaction");
// Use scope here to limit variable lifetime and prevent `stack too deep` errors
{
uint256 gasUsed = gasleft();
// If the gasPrice is 0 we assume that nearly all available gas can be used (it is always more than safeTxGas)
// We only substract 2500 (compared to the 3000 before) to ensure that the amount passed is still higher than safeTxGas
success = execute(to, value, data, operation, gasPrice == 0 ? (gasleft() - 2500) : safeTxGas);
gasUsed = gasUsed.sub(gasleft());
// We transfer the calculated tx costs to the tx.origin to avoid sending it to intermediate contracts that have made calls
uint256 payment = 0;
if (gasPrice > 0) {
payment = handlePayment(gasUsed, baseGas, gasPrice, gasToken, refundReceiver);
}
if (success) emit ExecutionSuccess(txHash, payment);
else emit ExecutionFailure(txHash, payment);
}
}
function handlePayment(
uint256 gasUsed,
uint256 baseGas,
uint256 gasPrice,
address gasToken,
address payable refundReceiver
)
private
returns (uint256 payment)
{
// solium-disable-next-line security/no-tx-origin
address payable receiver = refundReceiver == address(0) ? tx.origin : refundReceiver;
if (gasToken == address(0)) {
// For ETH we will only adjust the gas price to not be higher than the actual used gas price
payment = gasUsed.add(baseGas).mul(gasPrice < tx.gasprice ? gasPrice : tx.gasprice);
// solium-disable-next-line security/no-send
require(receiver.send(payment), "Could not pay gas costs with ether");
} else {
payment = gasUsed.add(baseGas).mul(gasPrice);
require(transferToken(gasToken, receiver, payment), "Could not pay gas costs with token");
}
}
/**
* @dev Checks whether the signature provided is valid for the provided data, hash. Will revert otherwise.
* @param dataHash Hash of the data (could be either a message hash or transaction hash)
* @param data That should be signed (this is passed to an external validator contract)
* @param signatures Signature data that should be verified. Can be ECDSA signature, contract signature (EIP-1271) or approved hash.
* @param consumeHash Indicates that in case of an approved hash the storage can be freed to save gas
*/
function checkSignatures(bytes32 dataHash, bytes memory data, bytes memory signatures, bool consumeHash)
internal
{
// Load threshold to avoid multiple storage loads
uint256 _threshold = threshold;
// Check that a threshold is set
require(_threshold > 0, "Threshold needs to be defined!");
// Check that the provided signature data is not too short
require(signatures.length >= _threshold.mul(65), "Signatures data too short");
// There cannot be an owner with address 0.
address lastOwner = address(0);
address currentOwner;
uint8 v;
bytes32 r;
bytes32 s;
uint256 i;
for (i = 0; i < _threshold; i++) {
(v, r, s) = signatureSplit(signatures, i);
// If v is 0 then it is a contract signature
if (v == 0) {
// When handling contract signatures the address of the contract is encoded into r
currentOwner = address(uint256(r));
// Check that signature data pointer (s) is not pointing inside the static part of the signatures bytes
// This check is not completely accurate, since it is possible that more signatures than the threshold are send.
// Here we only check that the pointer is not pointing inside the part that is being processed
require(uint256(s) >= _threshold.mul(65), "Invalid contract signature location: inside static part");
// Check that signature data pointer (s) is in bounds (points to the length of data -> 32 bytes)
require(uint256(s).add(32) <= signatures.length, "Invalid contract signature location: length not present");
// Check if the contract signature is in bounds: start of data is s + 32 and end is start + signature length
uint256 contractSignatureLen;
// solium-disable-next-line security/no-inline-assembly
assembly {
contractSignatureLen := mload(add(add(signatures, s), 0x20))
}
require(uint256(s).add(32).add(contractSignatureLen) <= signatures.length, "Invalid contract signature location: data not complete");
// Check signature
bytes memory contractSignature;
// solium-disable-next-line security/no-inline-assembly
assembly {
// The signature data for contract signatures is appended to the concatenated signatures and the offset is stored in s
contractSignature := add(add(signatures, s), 0x20)
}
require(ISignatureValidator(currentOwner).isValidSignature(data, contractSignature) == EIP1271_MAGIC_VALUE, "Invalid contract signature provided");
// If v is 1 then it is an approved hash
} else if (v == 1) {
// When handling approved hashes the address of the approver is encoded into r
currentOwner = address(uint256(r));
// Hashes are automatically approved by the sender of the message or when they have been pre-approved via a separate transaction
require(msg.sender == currentOwner || approvedHashes[currentOwner][dataHash] != 0, "Hash has not been approved");
// Hash has been marked for consumption. If this hash was pre-approved free storage
if (consumeHash && msg.sender != currentOwner) {
approvedHashes[currentOwner][dataHash] = 0;
}
} else if (v > 30) {
// To support eth_sign and similar we adjust v and hash the messageHash with the Ethereum message prefix before applying ecrecover
currentOwner = ecrecover(keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", dataHash)), v - 4, r, s);
} else {
// Use ecrecover with the messageHash for EOA signatures
currentOwner = ecrecover(dataHash, v, r, s);
}
require (
currentOwner > lastOwner && owners[currentOwner] != address(0) && currentOwner != SENTINEL_OWNERS,
"Invalid owner provided"
);
lastOwner = currentOwner;
}
}
/// @dev Allows to estimate a Safe transaction.
/// This method is only meant for estimation purpose, therefore two different protection mechanism against execution in a transaction have been made:
/// 1.) The method can only be called from the safe itself
/// 2.) The response is returned with a revert
/// When estimating set `from` to the address of the safe.
/// Since the `estimateGas` function includes refunds, call this method to get an estimated of the costs that are deducted from the safe with `execTransaction`
/// @param to Destination address of Safe transaction.
/// @param value Ether value of Safe transaction.
/// @param data Data payload of Safe transaction.
/// @param operation Operation type of Safe transaction.
/// @return Estimate without refunds and overhead fees (base transaction and payload data gas costs).
function requiredTxGas(address to, uint256 value, bytes calldata data, Enum.Operation operation)
external
authorized
returns (uint256)
{
uint256 startGas = gasleft();
// We don't provide an error message here, as we use it to return the estimate
// solium-disable-next-line error-reason
require(execute(to, value, data, operation, gasleft()));
uint256 requiredGas = startGas - gasleft();
// Convert response to string and return via error message
revert(string(abi.encodePacked(requiredGas)));
}
/**
* @dev Marks a hash as approved. This can be used to validate a hash that is used by a signature.
* @param hashToApprove The hash that should be marked as approved for signatures that are verified by this contract.
*/
function approveHash(bytes32 hashToApprove)
external
{
require(owners[msg.sender] != address(0), "Only owners can approve a hash");
approvedHashes[msg.sender][hashToApprove] = 1;
emit ApproveHash(hashToApprove, msg.sender);
}
/**
* @dev Marks a message as signed, so that it can be used with EIP-1271
* @notice Marks a message (`_data`) as signed.
* @param _data Arbitrary length data that should be marked as signed on the behalf of address(this)
*/
function signMessage(bytes calldata _data)
external
authorized
{
bytes32 msgHash = getMessageHash(_data);
signedMessages[msgHash] = 1;
emit SignMsg(msgHash);
}
/**
* Implementation of ISignatureValidator (see `interfaces/ISignatureValidator.sol`)
* @dev Should return whether the signature provided is valid for the provided data.
* The save does not implement the interface since `checkSignatures` is not a view method.
* The method will not perform any state changes (see parameters of `checkSignatures`)
* @param _data Arbitrary length data signed on the behalf of address(this)
* @param _signature Signature byte array associated with _data
* @return a bool upon valid or invalid signature with corresponding _data
*/
function isValidSignature(bytes calldata _data, bytes calldata _signature)
external
returns (bytes4)
{
bytes32 messageHash = getMessageHash(_data);
if (_signature.length == 0) {
require(signedMessages[messageHash] != 0, "Hash not approved");
} else {
// consumeHash needs to be false, as the state should not be changed
checkSignatures(messageHash, _data, _signature, false);
}
return EIP1271_MAGIC_VALUE;
}
/// @dev Returns hash of a message that can be signed by owners.
/// @param message Message that should be hashed
/// @return Message hash.
function getMessageHash(
bytes memory message
)
public
view
returns (bytes32)
{
bytes32 safeMessageHash = keccak256(
abi.encode(SAFE_MSG_TYPEHASH, keccak256(message))
);
return keccak256(
abi.encodePacked(byte(0x19), byte(0x01), domainSeparator, safeMessageHash)
);
}
/// @dev Returns the bytes that are hashed to be signed by owners.
/// @param to Destination address.
/// @param value Ether value.
/// @param data Data payload.
/// @param operation Operation type.
/// @param safeTxGas Fas that should be used for the safe transaction.
/// @param baseGas Gas costs for data used to trigger the safe transaction.
/// @param gasPrice Maximum gas price that should be used for this transaction.
/// @param gasToken Token address (or 0 if ETH) that is used for the payment.
/// @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin).
/// @param _nonce Transaction nonce.
/// @return Transaction hash bytes.
function encodeTransactionData(
address to,
uint256 value,
bytes memory data,
Enum.Operation operation,
uint256 safeTxGas,
uint256 baseGas,
uint256 gasPrice,
address gasToken,
address refundReceiver,
uint256 _nonce
)
public
view
returns (bytes memory)
{
bytes32 safeTxHash = keccak256(
abi.encode(SAFE_TX_TYPEHASH, to, value, keccak256(data), operation, safeTxGas, baseGas, gasPrice, gasToken, refundReceiver, _nonce)
);
return abi.encodePacked(byte(0x19), byte(0x01), domainSeparator, safeTxHash);
}
/// @dev Returns hash to be signed by owners.
/// @param to Destination address.
/// @param value Ether value.
/// @param data Data payload.
/// @param operation Operation type.
/// @param safeTxGas Fas that should be used for the safe transaction.
/// @param baseGas Gas costs for data used to trigger the safe transaction.
/// @param gasPrice Maximum gas price that should be used for this transaction.
/// @param gasToken Token address (or 0 if ETH) that is used for the payment.
/// @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin).
/// @param _nonce Transaction nonce.
/// @return Transaction hash.
function getTransactionHash(
address to,
uint256 value,
bytes memory data,
Enum.Operation operation,
uint256 safeTxGas,
uint256 baseGas,
uint256 gasPrice,
address gasToken,
address refundReceiver,
uint256 _nonce
)
public
view
returns (bytes32)
{
return keccak256(encodeTransactionData(to, value, data, operation, safeTxGas, baseGas, gasPrice, gasToken, refundReceiver, _nonce));
}
}
Compiler Settings
{"outputSelection":{"*":{"*":["*"],"":["*"]}},"optimizer":{"runs":200,"enabled":false},"libraries":{}}
Contract ABI
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Module","indexed":false}],"anonymous":false},{"type":"event","name":"EnabledModule","inputs":[{"type":"address","name":"module","internalType":"contract Module","indexed":false}],"anonymous":false},{"type":"event","name":"ExecutionFailure","inputs":[{"type":"bytes32","name":"txHash","internalType":"bytes32","indexed":false},{"type":"uint256","name":"payment","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"ExecutionFromModuleFailure","inputs":[{"type":"address","name":"module","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"ExecutionFromModuleSuccess","inputs":[{"type":"address","name":"module","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"ExecutionSuccess","inputs":[{"type":"bytes32","name":"txHash","internalType":"bytes32","indexed":false},{"type":"uint256","name":"payment","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"RemovedOwner","inputs":[{"type":"address","name":"owner","internalType":"address","indexed":false}],"anonymous":false},{"type":"event","name":"SignMsg","inputs":[{"type":"bytes32","name":"msgHash","internalType":"bytes32","indexed":true}],"anonymous":false},{"type":"fallback","stateMutability":"payable","payable":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"string","name":"","internalType":"string"}],"name":"NAME","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"string","name":"","internalType":"string"}],"name":"VERSION","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"addOwnerWithThreshold","inputs":[{"type":"address","name":"owner","internalType":"address"},{"type":"uint256","name":"_threshold","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"approveHash","inputs":[{"type":"bytes32","name":"hashToApprove","internalType":"bytes32"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"approvedHashes","inputs":[{"type":"address","name":"","internalType":"address"},{"type":"bytes32","name":"","internalType":"bytes32"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"changeMasterCopy","inputs":[{"type":"address","name":"_masterCopy","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"changeThreshold","inputs":[{"type":"uint256","name":"_threshold","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"disableModule","inputs":[{"type":"address","name":"prevModule","internalType":"contract Module"},{"type":"address","name":"module","internalType":"contract Module"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"domainSeparator","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"enableModule","inputs":[{"type":"address","name":"module","internalType":"contract Module"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bytes","name":"","internalType":"bytes"}],"name":"encodeTransactionData","inputs":[{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"},{"type":"bytes","name":"data","internalType":"bytes"},{"type":"uint8","name":"operation","internalType":"enum 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Enum.Operation"},{"type":"uint256","name":"safeTxGas","internalType":"uint256"},{"type":"uint256","name":"baseGas","internalType":"uint256"},{"type":"uint256","name":"gasPrice","internalType":"uint256"},{"type":"address","name":"gasToken","internalType":"address"},{"type":"address","name":"refundReceiver","internalType":"address"},{"type":"uint256","name":"_nonce","internalType":"uint256"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isModuleEnabled","inputs":[{"type":"address","name":"module","internalType":"contract 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Enum.Operation"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setFallbackHandler","inputs":[{"type":"address","name":"handler","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setup","inputs":[{"type":"address[]","name":"_owners","internalType":"address[]"},{"type":"uint256","name":"_threshold","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"bytes","name":"data","internalType":"bytes"},{"type":"address","name":"fallbackHandler","internalType":"address"},{"type":"address","name":"paymentToken","internalType":"address"},{"type":"uint256","name":"payment","internalType":"uint256"},{"type":"address","name":"paymentReceiver","internalType":"address payable"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"signMessage","inputs":[{"type":"bytes","name":"_data","internalType":"bytes"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"signedMessages","inputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"swapOwner","inputs":[{"type":"address","name":"prevOwner","internalType":"address"},{"type":"address","name":"oldOwner","internalType":"address"},{"type":"address","name":"newOwner","internalType":"address"}],"constant":false}]
Contract Creation Code
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