// 获取用户提交的登录请求数据$username = $_POST['username'];$password = $_POST['password'];$vcode = $_POST['vcode'];// 验证码的验证，OWASP-认证和授权失败if($vcode !== '0000'){die("vcode-error"); //向前端输出一条消息同时结束代码的运行}// 连接数据库$conn = mysqli_connect('127.0.0.1','root','123456','learn') or die("数据库连接不成功！");// 设置数据库的编码格式mysqli_query($conn,"set names utf8;");$sql = "select * from user where username ='$username' and password = '$password'";$result = mysqli_query($conn,$sql); //$result称之为结果集// 以下代码没用进行爆破的防护(OWASP-认证和授权失败)if (mysqli_num_rows($result) == 1){echo "login-pass<br/>";echo "<script>location.href='welcome.php'</script>";}else{// echo "login-fail<br/>";echo "<script>location.href='login.html'</script>";}//关闭数据库mysqli_close($conn)
// OWASP-失效访问控制// 修复方法：在显示文本之前，先进行SESSION变量的验证include "common.php";//isset() 函数用于检测变量是否已设置并且非 NULL。if (!isset($_SESSION['islogin']) or $_SESSION['islogin'] != 'true'){die ("请登录后再访问此页面</br>");}echo '欢迎来到安全测试平台';
<b>Warning</b>: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given in <b>/opt/lampp/htdocs/security/login.php</b>select * from user where username ='$username' and password = '$password'正常情况：select * from user where username ='root' and password = '$password'攻击情况：select * from user where username =''' and password = '$password'攻击Payload：username：x' or userid=1#'Post正文：username=x' or+userid=1#'&password=111111&vcode=0000select * from user where username ='x' or userid=1#'' and password = '$password'
/opt/lampp/htdocs/security/login.php（当前代码的绝对路径）import requests# 利用Python对PHP的登录界面进行Fuzz测试def login_fuzz():# 先使用单引号进行测试url = 'http://192.168.72.148/security/login.php'data = {'username': "'", 'password': '666666', 'vcode': '0000'}resp = requests.post(url=url, data=data)if 'Warning' in resp.text:print("本登录功能可能存在SQL注入漏洞，可以尝试")# 如果单引号存在利用嫌疑，则继续利用payload_list = ["x' or id=1#", "x' or userid=1#", "x' or userid=2#"]for username in payload_list:data = {'username': username, 'password': '666666', 'vcode': '0000'}resp = requests.post(url=url, data=data)if "login-fail" not in resp.text:print(f'登录成功，payload为：{data}')else:print('通过试探，发现后台界面对单引号不感兴趣;')if __name__ == '__main__':login_fuzz()
<?phpsession_start();function create_connection(){// 连接数据库$conn = mysqli_connect('127.0.0.1','root','123456','learn') or die("数据库连接不成功！");// 设置数据库的编码格式mysqli_query($conn,"set names utf8;");mysqli_set_charset($conn,'utf8');return $conn;}?>
// OWASP-失效访问控制// 修复方法：在显示文本之前，先进行SESSION变量的验证include "common.php";//isset() 函数用于检测变量是否已设置并且非 NULL。if (!isset($_SESSION['islogin']) or $_SESSION['islogin'] != 'true'){die ("请登录后再访问此页面</br>");}echo '欢迎来到安全测试平台';
if (mysqli_num_rows($result) == 1){echo "login-pass<br/>";// 登录成功后，记录SESSION变量$_SESSION['username'] = $username;$_SESSION['islogin'] = 'true';echo "<script>location.href='welcome.php'</script>";}
$result = mysqli_query($conn,$sql) or die("SQL语句执行错误!") ;$source = 'YikJiang';echo md5($source);//提示一：user表中password字段必须是32+位//提示二：在用户注册时，必须使用md5函数将密码加密保存
$sql = "select * from user where username ='$username'";$result = mysqli_query($conn,$sql) or die("SQL语句执行错误!") ; //$result称之为结果集// 以下代码没用进行爆破的防护(OWASP-认证和授权失败)//如果用户名真实存在，刚好找到一条，则再单独进行密码比较，即使用户名出现SQL注入漏洞，但是只要密码不正确，也无法登录if (mysqli_num_rows($result) == 1){// $row = mysqli_fetch_all($result,MYSQLI_ASSOC); //索引数组＋下标数组// $row = mysqli_fetch_row($result); //索引数组$row = mysqli_fetch_assoc($result); //下标数组// var_dump($row);if ($password == $row['password']){echo "login-pass<br/>";// 登录成功后，记录SESSION变量$_SESSION['username'] = $username;$_SESSION['islogin'] = 'true';echo "<script>location.href='welcome.php'</script>";}else{echo "login-fail";}}else{echo "login-fail<br/>";echo "<script>location.href='login.html'</script>";}
select * from user where username ='$username' and password = '$password'select * from user where username ='x' or userid=1#'' and password = '$password'select * from user where username ='x' or userid=1#'' and password = '$password'// 面向过程的方式function create_connection(){// 连接数据库$conn = mysqli_connect('127.0.0.1','root','123456','learn') or die("数据库连接不成功！");// 设置数据库的编码格式mysqli_query($conn,"set names utf8;");mysqli_set_charset($conn,'utf8');return $conn;}// 将数据库查询的结果集中的数据取出，保存到一个数组当中$row = mysqli_fetch_assoc($result);//mysqli_fetch_all默认使用索引数组，也可以设定参数强制使用关联数组// $row = mysqli_fetch_all($result,MYSQLI_ASSOC);// $row = mysqli_fetch_row($result); //索引数组
function create_connection_oop(){$conn = new mysqli('127.0.0.1','root','123456','learn') or die("数据库连接不成功！");// 两种方法设置字符集// 1、$conn->query("set names utf8;")// 2、$conn->set_charset('utf8');return $conn;}// 执行SQL语句function test_mysqli_opp(){$conn = create_connection_oop();$sql = "select * from user where userid < 6";$result = $conn->query($sql);//获取结果集行数echo $result->num_rows."</br>";// 获取结果集数组// 使用关联数组$rows = $result->fetch_all(MYSQLI_ASSOC);// var_dump($rows);// 遍历数组foreach ($rows as $row){echo "username:". $row['username'] . ",passwrod" . $row['password'] . "</br>";}}
$conn = create_connection_oop();$sql = "select userid,username,password,role from user where username= ?";$stmt = $conn->prepare($sql);$stmt->bind_param("s",$username); // 绑定查询参数$stmt->bind_result($userid,$username2,$password2,$role); // 绑定结果参数$stmt->execute(); // 执行$stmt->store_result(); //调用结果
#开启use mysql;set global log_output = 'TABLE';set global general_log = 'ON';#确认show variables like "general_log";
MySQLi的预处理功能同样支持面向过程和面向对象除了MySQLi用于处理数据库外，在PHP中还有最传统的MySQL和PDO两种方式
// 利用Session保存图片验证码session_start();getCode();// 生成验证码图片function getCode($vlen=4 , $width = 80 , $height = 25){// 定义响应类型为PNG图片header("content-type:image/png");// 生成随机验证码字符串,并将其保存于Session中$chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';$vcode =substr(str_shuffle($chars),0,$vlen);$_SESSION['vcode'] = $vcode;// 定义图片并设置背景色RGB为100,200,100$image = imagecreate($width,$height); // 创建一个画布$imageColor = imagecolorallocate($image,100,200,100);// 以RGB=0,0,0,的颜色回值黑色的文字$color = imagecolorallocate($image,0,0,0);imagestring($image,5,20,5,$vcode,$color); // 5:字体大小 20:距离x轴的距离 5:距离y轴的距离// 生成随机位置的干扰点for($i=0;$i<50;$i++){imagesetpixel($image,rand(0,$width),rand(0,$height),$color);}// 输出图片验证码,并将其在内存的数据销毁imagepng($image);imagedestroy($image);}
input[name='vcode']{width: 200px;}<body style="background-image:url(./image/1.png); background-size:cover;"><div class="login top-100 font-30">YikJiang</div><form action="login-3.php" method="post"><div class="login"><input type="text" name="username" /></div><div class="login"><input type="password" name="password" /></div><div class="login"><input type="text" name="vcode" /> <img src="vocde.php"/></div><div class="login"><!--*type="submit" 代表按钮类型为提交表单--><button type="submit">登录</button></div></form><div class="footer top-100">版权所有©YikJiang 沪ICP备18011293号</div></body></html>
if(strtoupper($_SESSION['vcode']) != strtoupper($vcode) ){die("vcode-error"); //向前端输出一条消息同时结束代码的运行}
《C++码农日记（全程视频讲解）》共9章。第1章讲述程序员入职前的准备以及C++跨平台开发入门知识，着重介绍求职面试相关知识，以及Qt的安装配置、开发环境搭建、第三方跨平台库基础知识、配套资源等内容；第2~8章通过50多个实际案例讲述命令行程序的开发、DLL（动态链接库）的开发与第三方库的使用、跨平台文件操作、多线程和进程内（多线程间）通信、进程间通信、异步串口通信、数据库访问等常用开发技能；第9章通过一个数据中心的案例介绍C/S模式（Client/Server模式，客户端/服务器模式）软件的综合开发技能。本书提供的案例覆盖了C/S模式软件开发工作的常见场景。
原文始发于微信公众号（web安全工具库）：SQL注入漏洞从发现到修复
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