【智能合约审计】————16、YiqiniuCrowdsale

合约地址：https://etherscan.io/address/0xaf81fe7b506d07e0a87b6dead5302781520a0e22#code

pragma solidity ^0.4.18;contract Ownable {address public owner;event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);constructor() public {owner = msg.sender;}modifier onlyOwner() {require(msg.sender == owner);  _;}function transferOwnership(address newOwner) public onlyOwner {require(newOwner != address(0));emit OwnershipTransferred(owner, newOwner);owner = newOwner;}
}library SafeMath {function mul(uint256 a, uint256 b) internal pure returns (uint256) {if (a == 0) {return 0;}uint256 c = a * b;assert(c / a == b);return c;}function div(uint256 a, uint256 b) internal pure returns (uint256) {uint256 c = a / b;return c;}function sub(uint256 a, uint256 b) internal pure returns (uint256) {assert(b <= a);return a - b;}function add(uint256 a, uint256 b) internal pure returns (uint256) {uint256 c = a + b;assert(c >= a);return c;}
}contract ERC20Basic {uint256 public totalSupply;function balanceOf(address who) public view returns (uint256);function transfer(address to, uint256 value) public returns (bool);event Transfer(address indexed from, address indexed to, uint256 value);
}contract ERC20 is ERC20Basic {function allowance(address owner, address spender) public view returns (uint256);function transferFrom(address from, address to, uint256 value) public returns (bool);function approve(address spender, uint256 value) public returns (bool);event Approval(address indexed owner, address indexed spender, uint256 value);
}library SafeERC20 {function safeTransfer(ERC20Basic token, address to, uint256 value) internal {assert(token.transfer(to, value));}function safeTransferFrom(ERC20 token, address from, address to, uint256 value) internal {assert(token.transferFrom(from, to, value));}function safeApprove(ERC20 token, address spender, uint256 value) internal {assert(token.approve(spender, value));}
}contract StandardToken is ERC20 {using SafeMath for uint256;mapping(address => uint256) balances;mapping (address => mapping (address => uint256)) internal allowed;function transfer(address _to, uint256 _value) public returns (bool) {require(_to != address(0));require(_value <= balances[msg.sender]);balances[msg.sender] = balances[msg.sender].sub(_value);balances[_to] = balances[_to].add(_value);emit Transfer(msg.sender, _to, _value);return true;}function balanceOf(address _owner) public view returns (uint256 balance) {return balances[_owner];}function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {require(_to != address(0));require(_value <= balances[_from]);require(_value <= allowed[_from][msg.sender]);balances[_from] = balances[_from].sub(_value);balances[_to] = balances[_to].add(_value);allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);emit Transfer(_from, _to, _value);return true;}function approve(address _spender, uint256 _value) public returns (bool) {allowed[msg.sender][_spender] = _value;emit Approval(msg.sender, _spender, _value);return true;}function allowance(address _owner, address _spender) public view returns (uint256) {return allowed[_owner][_spender];}function increaseApproval(address _spender, uint _addedValue) public returns (bool) {allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);return true;}function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {uint oldValue = allowed[msg.sender][_spender];if (_subtractedValue > oldValue) {allowed[msg.sender][_spender] = 0;} else {allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);}emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);return true;}
}contract TokenTimelock {using SafeERC20 for ERC20Basic;ERC20Basic public token;address public beneficiary;uint256 public releaseTime;constructor(ERC20Basic _token, address _beneficiary, uint256 _releaseTime) public {require(_releaseTime > now);token = _token;beneficiary = _beneficiary;releaseTime = _releaseTime;}function release() public {require(now >= releaseTime);uint256 amount = token.balanceOf(this);require(amount > 0);token.safeTransfer(beneficiary, amount);}
}contract MintableToken is StandardToken, Ownable {event Mint(address indexed to, uint256 amount);event MintFinished();bool public mintingFinished = false;modifier canMint() {require(!mintingFinished);_;}function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {totalSupply = totalSupply.add(_amount);balances[_to] = balances[_to].add(_amount);emit Mint(_to, _amount);emit Transfer(address(0), _to, _amount);return true;}function finishMinting() onlyOwner canMint public returns (bool) {mintingFinished = true;emit MintFinished();return true;}
}contract YiqiniuToken is MintableToken {string public constant name   = 'Yiqiniu';string public constant symbol = 'KEY';uint256 public constant decimals  = 18;event Burned(address indexed burner, uint256 value);function burn(uint256 _value) public onlyOwner {require(_value > 0);address burner = msg.sender;balances[burner] = balances[burner].sub(_value);totalSupply = totalSupply.sub(_value);emit Burned(burner, _value);}
}contract CrowdsaleConfig {uint256 public constant TOKEN_DECIMALS      = 18;uint256 public constant MIN_TOKEN_UNIT      = 10 ** uint256(TOKEN_DECIMALS);uint256 public constant TOTAL_SUPPLY_CAP        = 100000000 * MIN_TOKEN_UNIT;uint256 public constant PUBLIC_SALE_TOKEN_CAP   = TOTAL_SUPPLY_CAP / 100 * 30;uint256 public constant AGENCY_TOKEN_CAP        = TOTAL_SUPPLY_CAP / 100 * 20;uint256 public constant TEAM_TOKEN_CAP          = TOTAL_SUPPLY_CAP / 100 * 50;address public constant TEAM_ADDR       = 0xd589737E4CbeC49E862D3A54c75aF16e27dD8fC1;address public constant AGENCY_ADDR             = 0xc849e7225fF088e187136A670662e36adE5A89FC;address public constant WALLET_ADDR             = 0xd589737E4CbeC49E862D3A54c75aF16e27dD8fC1;
}contract YiqiniuCrowdsale is Ownable, CrowdsaleConfig{using SafeMath for uint256;using SafeERC20 for YiqiniuToken;// Token contractYiqiniuToken public token;uint64 public startTime;uint64 public endTime;uint256 public rate = 10000;uint256 public goalSale;uint256 public totalPurchased = 0;bool public CrowdsaleEnabled = false;mapping(address => bool) public isVerified;mapping(address => uint256) public tokensPurchased;uint256 public maxTokenPurchase = 100000 * MIN_TOKEN_UNIT;uint256 public minTokenPurchase = 1 * MIN_TOKEN_UNIT;TokenTimelock public AgencyLock1;TokenTimelock public AgencyLock2;event NewYiqiniuToken(address _add);constructor() public {startTime = uint64(now);endTime = uint64(now + 3600*24*4);goalSale = PUBLIC_SALE_TOKEN_CAP / 100 * 50;token = new YiqiniuToken();emit NewYiqiniuToken(address(token));token.mint(address(this), TOTAL_SUPPLY_CAP);token.finishMinting();uint64 TimeLock1 = uint64(now + 3600*24*5);uint64 TimeLock2 = uint64(now + 3600*24*6);AgencyLock1 = new TokenTimelock(token, AGENCY_ADDR, TimeLock1);AgencyLock2 = new TokenTimelock(token, AGENCY_ADDR, TimeLock2);token.safeTransfer(AgencyLock1, AGENCY_TOKEN_CAP/2);token.safeTransfer(AgencyLock2, AGENCY_TOKEN_CAP/2);token.safeTransfer(TEAM_ADDR,TEAM_TOKEN_CAP);}function releaseLockAgencyLock1() public {AgencyLock1.release();}function releaseLockAgencyLock2() public {AgencyLock2.release();}function () external payable {   buyTokens(msg.sender);}modifier canCrowdsale() {require(CrowdsaleEnabled);_;}function enableCrowdsale() public onlyOwner {CrowdsaleEnabled = true;}function closeCrowdsale() public onlyOwner {CrowdsaleEnabled = false;}function buyTokens(address participant) internal canCrowdsale {require(now >= startTime);require(now < endTime);require(msg.value != 0);require(isVerified[participant]);uint256 weiAmount = msg.value;uint256 tokens = weiAmount.mul(rate);tokensPurchased[participant] = tokensPurchased[participant].add(tokens);require(tokensPurchased[participant] >= minTokenPurchase);require(tokensPurchased[participant] <= maxTokenPurchase);totalPurchased = totalPurchased.add(tokens);token.safeTransfer(participant, tokens);}function setTokenPrice(uint256 _tokenRate) public onlyOwner {require(now > startTime);require(_tokenRate > 0);rate = _tokenRate;}function setLimitTokenPurchase(uint256 _minToken, uint256 _maxToken) public onlyOwner {require(goalSale >= maxTokenPurchase);minTokenPurchase = _minToken;maxTokenPurchase = _maxToken;}function addVerified (address[] _ads) public onlyOwner {for(uint i = 0; i < _ads.length; i++){isVerified[_ads[i]] = true;}}function removeVerified (address _address) public onlyOwner {isVerified[_address] = false;}function close() onlyOwner public {require(now >= endTime || totalPurchased >= goalSale);token.burn(token.balanceOf(this));WALLET_ADDR.transfer(address(this).balance);}
}

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【智能合约审计】————16、YiqiniuCrowdsale

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