solutions/CCTF_Solutions_main/ctf.sol

/**
 *Submitted for verification at polygonscan.com on 2022-08-24
*/

// SPDX-License-Identifier: Apache-2.0
// Authors: six and Silur
pragma solidity ^0.8.16;

import "./verifier.sol";


contract CCTF9 is Verifier{
    address public admin;
    uint256 public volStart;
    uint256 public volMaxPoints;
    uint256 public powDiff;
    bool public started;

    enum PlayerStatus {
        Unverified,
        Verified,
        Banned
    }

    struct Player {
        PlayerStatus status;
        uint256 points;
    }

    modifier onlyAdmin {
        require(msg.sender == admin, "Not admin");
        _;
    }

    modifier onlyActive {
        require(started == true, "CCTF not started.");
        _;
    }

    struct Hash {
        uint32[8] value;
    }

    struct Flag {
        Hash flagHash;
        bool onlyFirstSolver;
        uint256 points;
        string skill_name;
    }

    mapping (address => Player) public players;
    mapping (uint256 => Flag) public flags;

    event CCTFStarted(uint256 timestamp);
    event FlagAdded(uint256 indexed flagId, Hash flagHash);
    event FlagRemoved(uint256 indexed flagId);
    event FlagSolved(uint256 indexed flagId, address indexed solver);

    constructor(uint256 _volMaxPoints, uint256 _powDiff) {
        admin = msg.sender;
        volMaxPoints = _volMaxPoints;
        powDiff = _powDiff;
        started = false;
    }

    function setAdmin(address _admin) external onlyAdmin {
        require(_admin != address(0));
        admin = _admin;
    }

    function setCCTFStatus(bool _started) external onlyAdmin {
        started = _started;
    }

    function setFlag(uint256 _flagId,Hash memory _flagHash, bool _onlyFirstSolver, uint256 _points, string memory _skill) external onlyAdmin{
        flags[_flagId] = Flag(_flagHash, _onlyFirstSolver, _points, _skill);
        emit FlagAdded(_flagId, _flagHash);
    }

    function setPowDiff(uint256 _powDiff) external onlyAdmin {
        powDiff = _powDiff;
    }


    function register(string memory _RTFM) external {
        require(players[msg.sender].status == PlayerStatus.Unverified, 'Already registered or banned');
        //uint256 pow = uint256(keccak256(abi.encodePacked("CCTF", msg.sender,"registration", nonce)));
        //require(pow < powDiff, "invalid pow");
        require(keccak256(abi.encodePacked('I_read_it')) == keccak256(abi.encodePacked(_RTFM)));  // PoW can be used for harder challenges, this is Entry!
        players[msg.sender].status = PlayerStatus.Verified;
    }

    function setPlayerStatus(address player, PlayerStatus status) external onlyAdmin {
        players[player].status = status;
    }


    ////////// Submit flags
    mapping(bytes32 => bool) usedNs;                       // Against replay attack (we only check message signer)
    mapping (address => mapping (uint256 => bool)) Solves;     // address -> challenge ID -> solved/not
    uint256 public submission_success_count = 0;               // For statistics

    function SubmitFlag(Proof memory p, uint256 _submitFor) external onlyActive {
        require(players[msg.sender].status == PlayerStatus.Verified, "You are not even playing");

        uint[13] memory inputs;
        for(uint i =0 ; i < 8;++i){
            inputs[i] = flags[_submitFor].flagHash.value[i];
        }
        uint32[5] memory addr = addressToUint32(msg.sender);
        for(uint i =0; i < 5;++i){
            inputs[8+i] = addr[i];
        }
        bool valid = verifyTx(p,inputs);
        assert(valid);


        Solves[msg.sender][_submitFor] = true;
        players[msg.sender].points += flags[_submitFor].points;
        players[msg.sender].points = players[msg.sender].points < volMaxPoints ? players[msg.sender].points : volMaxPoints;

        if (flags[_submitFor].onlyFirstSolver) {
            flags[_submitFor].points = 0;
        }

        submission_success_count = submission_success_count + 1;
        emit FlagSolved(_submitFor, msg.sender);
    }


    function addressToUint32 (address _addr) public view returns (uint32[5] memory)
    {
        uint256 targetUint = uint256(uint160(_addr));
        uint32[5] memory addr = [uint32(targetUint/4294967296**4),uint32(targetUint/4294967296**3),uint32(targetUint/4294967296**2),uint32(targetUint/4294967296),uint32(targetUint)];
        return addr;
    }

    ////////// Check status, scores, etc
    function getPlayerStatus(address _player) external view returns (PlayerStatus) {
        return players[_player].status;
    }

    function getPlayerPoints(address _player) external view returns (uint256) {
        return players[_player].points < volMaxPoints ? players[_player].points : volMaxPoints;
    }

    function getSuccessfulSubmissionCount() external view returns (uint256){
        return submission_success_count;
    }

    function getFlag(uint256 id) external view returns (Flag memory) {
        return flags[id];
    }
}