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YourName

  1. 晴天，多年web2游戏开发，进去币圈多年，现在希望学习web3开发

  2. 你认为你会完成本次残酷学习吗？ 可以

Notes

2024.09.23

學習內容:

  • A 系列的 Ethernaut CTF, 之前做了差不多了. POC: ethernaut-foundry-solutions
  • A 系列的 QuillAudit CTF 題目的網站關掉了, 幫大家收集了題目, 不過還是有幾題沒找到. 有找到題目的人可以在發出來.
  • A 系列的 DamnVulnerableDeFi 有持續更新, 題目也不錯. Damn Vulnerable DeFi.
  • 使用 Foundry 在本地解題目, 可以參考下面 RoadClosed 為例子
  • forge test --match-teat testRoadClosedExploit -vvvv

QuillAudit CTF - RoadClosed

  function addToWhitelist(address addr) public {
    require(!isContract(addr), "Contracts are not allowed");
    whitelistedMinters[addr] = true;
  }

  function changeOwner(address addr) public {
    require(whitelistedMinters[addr], "You are not whitelisted");
    require(msg.sender == addr, "address must be msg.sender");
    require(addr != address(0), "Zero address");
    owner = addr;
  }

  function pwn(address addr) external payable {
    require(!isContract(msg.sender), "Contracts are not allowed");
    require(msg.sender == addr, "address must be msg.sender");
    require(msg.sender == owner, "Must be owner");
    hacked = true;
  }

  function pwn() external payable {
    require(msg.sender == pwner);
    hacked = true;
  }
  • 解決這個題目需要成為合約的 owner 和 hacked = true.
  • On-chain: 可以透過 cast send 或是 forge script 來解.
  • Local: 透過 forge test 通常是在local解題, 方便 debug.
  • RoadClosed 為例子我寫了2個解題方式. testRoadClosedExploit 和 testRoadClosedContractExploit (因為題目有檢查msg.sender是不是合約, 所以可以透過constructor來繞過 isContract)
  • POC