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SocialRecoveryModule.sol
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SocialRecoveryModule.sol
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// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.8.12 <0.9.0;
import {IGuardianStorage} from "./storage/IGuardianStorage.sol";
import {SignatureChecker} from "@openzeppelin/contracts/utils/cryptography/SignatureChecker.sol";
import {ISafe, IOwnerManager, Enum} from "./../../interfaces/ISafe.sol";
/// @title Social Recovery Module
/// @author CANDIDE Labs
contract SocialRecoveryModule {
string public constant NAME = "Social Recovery Module";
string public constant VERSION = "0.0.1";
// keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");
bytes32 private constant DOMAIN_SEPARATOR_TYPEHASH = 0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f;
// keccak256("ExecuteRecovery(address wallet,address[] newOwners,uint256 newThreshold,uint256 nonce)");
bytes32 private constant EXECUTE_RECOVERY_TYPEHASH = 0x124b64921a7c7e677c6cc3b132eaaa57130bc6fc05ab157f35fe5264a7c198d5;
address internal constant SENTINEL_OWNERS = address(0x1);
struct SignatureData {
address signer;
bytes signature;
}
struct RecoveryRequest {
uint256 guardiansApprovalCount;
uint256 newThreshold;
uint64 executeAfter;
address[] newOwners;
}
mapping(address => RecoveryRequest) internal recoveryRequests;
mapping(bytes32 => mapping(address => bool)) internal confirmedHashes;
mapping(address => uint256) internal walletsNonces;
// The guardians storage
IGuardianStorage internal immutable guardianStorage;
// Recovery period
uint256 internal immutable recoveryPeriod;
event RecoveryExecuted(
address indexed wallet,
address[] indexed newOwners,
uint256 newThreshold,
uint256 nonce,
uint64 executeAfter,
uint256 guardiansApprovalCount
);
event RecoveryFinalized(address indexed wallet, address[] indexed newOwners, uint256 newThreshold, uint256 nonce);
event RecoveryCanceled(address indexed wallet, uint256 nonce);
/**
* @notice Throws if the sender is not the module itself or the owner of the target wallet.
*/
modifier authorized(address _wallet) {
require(msg.sender == _wallet, "SM: unauthorized");
_;
}
/**
* @notice Throws if there is no ongoing recovery request.
*/
modifier whenRecovery(address _wallet) {
require(recoveryRequests[_wallet].executeAfter > 0, "SM: no ongoing recovery");
_;
}
constructor(IGuardianStorage _guardianStorage, uint256 _recoveryPeriod) {
guardianStorage = _guardianStorage;
recoveryPeriod = _recoveryPeriod;
}
////////////////
/// @dev Returns the chain id used by this contract.
function getChainId() public view returns (uint256) {
uint256 id;
// solhint-disable-next-line no-inline-assembly
assembly {
id := chainid()
}
return id;
}
function domainSeparator() public view returns (bytes32) {
return
keccak256(
abi.encode(
DOMAIN_SEPARATOR_TYPEHASH,
keccak256(abi.encodePacked(NAME)),
keccak256(abi.encodePacked(VERSION)),
getChainId(),
this
)
);
}
/// @dev Returns the bytes that are hashed to be signed by guardians.
function encodeRecoveryData(
address _wallet,
address[] calldata _newOwners,
uint256 _newThreshold,
uint256 _nonce
) public view returns (bytes memory) {
bytes32 recoveryHash = keccak256(
abi.encode(EXECUTE_RECOVERY_TYPEHASH, _wallet, keccak256(abi.encodePacked(_newOwners)), _newThreshold, _nonce)
);
return abi.encodePacked(bytes1(0x19), bytes1(0x01), domainSeparator(), recoveryHash);
}
/// @dev Generates the recovery hash that should be signed by the guardian to authorize a recovery
function getRecoveryHash(
address _wallet,
address[] calldata _newOwners,
uint256 _newThreshold,
uint256 _nonce
) public view returns (bytes32) {
return keccak256(encodeRecoveryData(_wallet, _newOwners, _newThreshold, _nonce));
}
/// @dev checks if valid signature to the provided signer, and if this signer is indeed a guardian, revert otherwise
function validateGuardianSignature(address _wallet, bytes32 _signHash, address _signer, bytes memory _signature) public view {
require(isGuardian(_wallet, _signer), "SM: Signer not a guardian");
require(SignatureChecker.isValidSignatureNow(_signer, _signHash, _signature), "SM: Invalid guardian signature");
}
/**
* @notice Lets single guardian confirm the execution of the recovery request.
* Can also trigger the start of the execution by passing true to '_execute' parameter.
* Once triggered the recovery is pending for the recovery period before it can be finalised.
* @param _wallet The target wallet.
* @param _newOwners The new owners' addressess.
* @param _newThreshold The new threshold for the safe.
* @param _execute Whether to auto-start execution of recovery.
*/
function confirmRecovery(address _wallet, address[] calldata _newOwners, uint256 _newThreshold, bool _execute) external {
require(isGuardian(_wallet, msg.sender), "SM: sender not a guardian");
require(_newOwners.length > 0, "SM: owners cannot be empty");
require(_newThreshold > 0 && _newOwners.length >= _newThreshold, "SM: invalid new threshold");
//
uint256 _nonce = nonce(_wallet);
bytes32 recoveryHash = getRecoveryHash(_wallet, _newOwners, _newThreshold, _nonce);
confirmedHashes[recoveryHash][msg.sender] = true;
//
if (!_execute) return;
uint256 guardiansThreshold = threshold(_wallet);
uint256 _approvalCount = getRecoveryApprovals(_wallet, _newOwners, _newThreshold);
require(_approvalCount >= guardiansThreshold, "SM: confirmed signatures less than threshold");
_executeRecovery(_wallet, _newOwners, _newThreshold, _approvalCount);
}
/**
* @notice Lets multiple guardians confirm the execution of the recovery request.
* Can also trigger the start of the execution by passing true to '_execute' parameter.
* Once triggered the recovery is pending for the recovery period before it can be finalised.
* @param _wallet The target wallet.
* @param _newOwners The new owners' addressess.
* @param _newThreshold The new threshold for the safe.
* @param _signatures The guardians signatures.
* @param _execute Whether to auto-start execution of recovery.
*/
function multiConfirmRecovery(
address _wallet,
address[] calldata _newOwners,
uint256 _newThreshold,
SignatureData[] memory _signatures,
bool _execute
) external {
require(_newOwners.length > 0, "SM: owners cannot be empty");
require(_newThreshold > 0 && _newOwners.length >= _newThreshold, "SM: invalid new threshold");
require(_signatures.length > 0, "SM: empty signatures");
uint256 guardiansThreshold = threshold(_wallet);
require(guardiansThreshold > 0, "SM: empty guardians");
//
uint256 _nonce = nonce(_wallet);
bytes32 recoveryHash = getRecoveryHash(_wallet, _newOwners, _newThreshold, _nonce);
address lastSigner = address(0);
for (uint256 i = 0; i < _signatures.length; i++) {
SignatureData memory value = _signatures[i];
if (value.signature.length == 0) {
require(isGuardian(_wallet, msg.sender), "SM: sender not a guardian");
require(msg.sender == value.signer, "SM: null signature should have the signer as the sender");
} else {
validateGuardianSignature(_wallet, recoveryHash, value.signer, value.signature);
}
require(value.signer > lastSigner, "SM: duplicate signers/invalid ordering");
confirmedHashes[recoveryHash][value.signer] = true;
lastSigner = value.signer;
}
//
if (!_execute) return;
uint256 _approvalCount = getRecoveryApprovals(_wallet, _newOwners, _newThreshold);
require(_approvalCount >= guardiansThreshold, "SM: confirmed signatures less than threshold");
_executeRecovery(_wallet, _newOwners, _newThreshold, _approvalCount);
}
/**
* @notice Lets the guardians start the execution of the recovery request.
* Once triggered the recovery is pending for the recovery period before it can be finalised.
* @param _wallet The target wallet.
* @param _newOwners The new owners' addressess.
* @param _newThreshold The new threshold for the safe.
*/
function executeRecovery(address _wallet, address[] calldata _newOwners, uint256 _newThreshold) external {
uint256 guardiansThreshold = threshold(_wallet);
require(guardiansThreshold > 0, "SM: empty guardians");
//
uint256 _approvalCount = getRecoveryApprovals(_wallet, _newOwners, _newThreshold);
require(_approvalCount >= guardiansThreshold, "SM: confirmed signatures less than threshold");
_executeRecovery(_wallet, _newOwners, _newThreshold, _approvalCount);
}
function _executeRecovery(address _wallet, address[] calldata _newOwners, uint256 _newThreshold, uint256 _approvalCount) internal {
uint256 _nonce = nonce(_wallet);
// If an ongoing recovery exists, replace only if more guardians than the previous guardians have approved this replacement
RecoveryRequest storage request = recoveryRequests[_wallet];
if (request.executeAfter > 0) {
require(_approvalCount > request.guardiansApprovalCount, "SM: not enough approvals for replacement");
delete recoveryRequests[_wallet];
emit RecoveryCanceled(_wallet, _nonce - 1);
}
// Start recovery execution
uint64 executeAfter = uint64(block.timestamp + recoveryPeriod);
recoveryRequests[_wallet] = RecoveryRequest(_approvalCount, _newThreshold, executeAfter, _newOwners);
walletsNonces[_wallet]++;
emit RecoveryExecuted(_wallet, _newOwners, _newThreshold, _nonce, executeAfter, _approvalCount);
}
/**
* @notice Finalizes an ongoing recovery request if the recovery period is over.
* The method is public and callable by anyone to enable orchestration.
* @param _wallet The target wallet.
*/
function finalizeRecovery(address _wallet) external whenRecovery(_wallet) {
RecoveryRequest storage request = recoveryRequests[_wallet];
require(uint64(block.timestamp) >= request.executeAfter, "SM: recovery period still pending");
address[] memory newOwners = request.newOwners;
uint256 newThreshold = request.newThreshold;
delete recoveryRequests[_wallet];
ISafe safe = ISafe(payable(_wallet));
address[] memory owners = safe.getOwners();
for (uint256 i = (owners.length - 1); i > 0; --i) {
bool success = safe.execTransactionFromModule({
to: _wallet,
value: 0,
data: abi.encodeCall(IOwnerManager.removeOwner, (owners[i - 1], owners[i], 1)),
operation: Enum.Operation.Call
});
if (!success) {
revert("SM: owner removal failed");
}
}
for (uint256 i = 0; i < newOwners.length; i++) {
require(!isGuardian(_wallet, newOwners[i]), "SM: new owner cannot be guardian");
bool success;
if (i == 0) {
if (newOwners[i] == owners[i]) continue;
success = safe.execTransactionFromModule({
to: _wallet,
value: 0,
data: abi.encodeCall(IOwnerManager.swapOwner, (SENTINEL_OWNERS, owners[i], newOwners[i])),
operation: Enum.Operation.Call
});
if (!success) {
revert("SM: owner replacement failed");
}
continue;
}
success = safe.execTransactionFromModule({
to: _wallet,
value: 0,
data: abi.encodeCall(IOwnerManager.addOwnerWithThreshold, (newOwners[i], 1)),
operation: Enum.Operation.Call
});
if (!success) {
revert("SM: owner addition failed");
}
}
if (newThreshold > 1) {
bool success = safe.execTransactionFromModule({
to: _wallet,
value: 0,
data: abi.encodeCall(IOwnerManager.changeThreshold, (newThreshold)),
operation: Enum.Operation.Call
});
if (!success) {
revert("SM: change threshold failed");
}
}
emit RecoveryFinalized(_wallet, newOwners, newThreshold, walletsNonces[_wallet] - 1);
}
/**
* @notice Lets the owner cancel an ongoing recovery request.
* @param _wallet The target wallet.
*/
function cancelRecovery(address _wallet) external authorized(_wallet) whenRecovery(_wallet) {
delete recoveryRequests[_wallet];
emit RecoveryCanceled(_wallet, walletsNonces[_wallet] - 1);
}
/**
* @notice Lets the owner add a guardian for its wallet.
* @param _wallet The target wallet.
* @param _guardian The guardian to add.
* @param _threshold The new threshold that will be set after addition.
*/
function addGuardianWithThreshold(address _wallet, address _guardian, uint256 _threshold) external authorized(_wallet) {
guardianStorage.addGuardianWithThreshold(_wallet, _guardian, _threshold);
}
/**
* @notice Lets the owner revoke a guardian from its wallet.
* @param _wallet The target wallet.
* @param _prevGuardian The previous guardian linking to the guardian in the linked list.
* @param _guardian The guardian to revoke.
* @param _threshold The new threshold that will be set after execution of revocation.
*/
function revokeGuardianWithThreshold(
address _wallet,
address _prevGuardian,
address _guardian,
uint256 _threshold
) external authorized(_wallet) {
guardianStorage.revokeGuardianWithThreshold(_wallet, _prevGuardian, _guardian, _threshold);
}
/**
* @notice Lets the owner change the guardian threshold required to initiate a recovery.
* @param _wallet The target wallet.
* @param _threshold The new threshold that will be set after execution of revocation.
*/
function changeThreshold(address _wallet, uint256 _threshold) external authorized(_wallet) {
guardianStorage.changeThreshold(_wallet, _threshold);
}
/**
* @notice Retrieves the wallet's current ongoing recovery request.
* @param _wallet The target wallet.
* @return request The wallet's current recovery request
*/
function getRecoveryRequest(address _wallet) public view returns (RecoveryRequest memory request) {
return recoveryRequests[_wallet];
}
/**
* @notice Retrieves the guardian approval count for this particular recovery request at current nonce.
* @param _wallet The target wallet.
* @param _newOwners The new owners' addressess.
* @param _newThreshold The new threshold for the safe.
* @return approvalCount The wallet's current recovery request
*/
function getRecoveryApprovals(
address _wallet,
address[] calldata _newOwners,
uint256 _newThreshold
) public view returns (uint256 approvalCount) {
uint256 _nonce = nonce(_wallet);
bytes32 recoveryHash = getRecoveryHash(_wallet, _newOwners, _newThreshold, _nonce);
address[] memory guardians = getGuardians(_wallet);
approvalCount = 0;
for (uint256 i = 0; i < guardians.length; i++) {
if (confirmedHashes[recoveryHash][guardians[i]]) {
approvalCount++;
}
}
}
/**
* @notice Retrieves specific guardian approval status a particular recovery request at current nonce.
* @param _wallet The target wallet.
* @param _guardian The guardian.
* @param _newOwners The new owners' addressess.
* @param _newThreshold The new threshold for the safe.
* @return approvalCount The wallet's current recovery request
*/
function hasGuardianApproved(
address _wallet,
address _guardian,
address[] calldata _newOwners,
uint256 _newThreshold
) public view returns (bool) {
uint256 _nonce = nonce(_wallet);
bytes32 recoveryHash = getRecoveryHash(_wallet, _newOwners, _newThreshold, _nonce);
return confirmedHashes[recoveryHash][_guardian];
}
/**
* @notice Checks if an address is a guardian for a wallet.
* @param _wallet The target wallet.
* @param _guardian The address to check.
* @return _isGuardian `true` if the address is a guardian for the wallet otherwise `false`.
*/
function isGuardian(address _wallet, address _guardian) public view returns (bool _isGuardian) {
return guardianStorage.isGuardian(_wallet, _guardian);
}
/**
* @notice Counts the number of active guardians for a wallet.
* @param _wallet The target wallet.
* @return _count The number of active guardians for a wallet.
*/
function guardiansCount(address _wallet) public view returns (uint256 _count) {
return guardianStorage.guardiansCount(_wallet);
}
/**
* @dev Retrieves the wallet threshold count.
* @param _wallet The target wallet.
* @return _threshold Threshold count.
*/
function threshold(address _wallet) public view returns (uint256 _threshold) {
return guardianStorage.threshold(_wallet);
}
/**
* @notice Get the active guardians for a wallet.
* @param _wallet The target wallet.
* @return _guardians the active guardians for a wallet.
*/
function getGuardians(address _wallet) public view returns (address[] memory _guardians) {
return guardianStorage.getGuardians(_wallet);
}
/**
* @notice Get the module nonce for a wallet.
* @param _wallet The target wallet.
* @return _nonce the nonce for this wallet.
*/
function nonce(address _wallet) public view returns (uint256 _nonce) {
return walletsNonces[_wallet];
}
}