php - 在 PDO 准备好的语句中验证 password_hash()

Question

我正在尝试使用 bcrypt 算法对密码进行哈希处理，但我遇到了几个问题。首先，我找不到合适的位置来检查 password_verify() 是否返回 true。

$admin = $_POST['admin-user'];
$pass = $_POST['admin-pass'];

$password_hash = password_hash($pass, PASSWORD_BCRYPT);

if (isset($admin)&&isset($pass)&&!empty($admin)&&!empty($pass)) {

$admin_select = $link->prepare("SELECT `id` FROM `admins` WHERE `username` = :admin");

$admin_passwd = $link->prepare("SELECT `password` FROM `admins` WHERE `username` = :admin_pw");
$admin_passwd->execute(array(':admin_pw' => $admin));
$admin_pwd = $admin_passwd->fetch(PDO::FETCH_ASSOC);

    if (password_verify($pass, $admin_pwd)){

            if ($admin_select->execute(array(':admin' => $admin))) {
                $res = $link->query('SELECT COUNT(*) FROM requests');
                $query_num_rowz = $res->fetchColumn();
            if ($query_num_rowz == 0) {
                echo 'No records found';
            } else if ($query_num_rowz > 0) {
                $query = $link->prepare("SELECT id FROM admins WHERE username = :admin");
                 $query->execute(array(':admin' => $admin));
                 $admin_id = $query->fetch(PDO::FETCH_ASSOC);
                $_SESSION['admin_id'] = $admin_id;
                header('Location: index.php');
            }
        }
    }
}

其次，我不确定这是选择用户密码的正确方法。

$admin_passwd = $link->prepare("SELECT `password` FROM `admins` WHERE `username` = :admin_pw");
$admin_passwd->execute(array(':admin_pw' => $admin));
$admin_pwd = $admin_passwd->fetch(PDO::FETCH_ASSOC);

Answer 1

由于您没有将 ->fetch 放入循环中，因此单次调用将返回一行关联数组。您必须首先访问正确的索引(在本例中为 password)。然后将 password_verify 中的行值(至少如果它已经被散列)与用户输入进行比较。粗略的例子:

if(!empty($_POST['admin-user'] && !empty($_POST['admin-pass']))) {
    $admin = $_POST['admin-user'];
    $pass = $_POST['admin-pass'];

    $admin_info = $link->prepare("SELECT `password` FROM `admins` WHERE `username` = :admin_user");
    $admin_info->execute(array(':admin_user' => $admin));
    $row = $admin_info->fetch(PDO::FETCH_ASSOC);

    if($row && password_verify($pass, $row['password'])) {
        // okay
    } else {
        // no such user/password
    }
}