14

GatekeeperTwo

tl; dr

contract GatekeeperTwo {

  address public entrant;

  modifier gateOne() {
    require(msg.sender != tx.origin);
    _;
  }

  modifier gateTwo() {
    uint x;
    assembly { x := extcodesize(caller()) }
    require(x == 0);
    _;
  }

  modifier gateThree(bytes8 _gateKey) {
    require(uint64(bytes8(keccak256(abi.encodePacked(msg.sender)))) ^ uint64(_gateKey) == type(uint64).max);
    _;
  }

  function enter(bytes8 _gateKey) public gateOne gateTwo gateThree(_gateKey) returns (bool) {
    entrant = tx.origin;
    return true;
  }
}

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discussion

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solution

• check test/14/GatekeeperTwo.t.sol:

• run:

> forge test --match-contract GatekeeperTwoTest -vvvv    

• submit with script/14/GatekeeperTwo.s.sol:

• by running:

> forge script ./script/14/GatekeeperTwo.s.sol --broadcast -vvvv --rpc-url sepolia

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pwned...