PHP CMS 登录黑客

Question

最近有人入侵了我的 PHP CMS 并植入了 SQL 注入(inject)。有没有办法让我的登录代码更安全并防止黑客入侵？任何帮助都会很棒，谢谢。

登录表单

<div id="loginform">

  <form method="post" action="check-login.php" name="form1">

    <label for="username" /><span style="color:#FFFFFF; font-family:'Trebuchet MS', Arial, Helvetica, sans-serif;">username:</span></label>

    <input type="text" name="myusername" id="username"/>

    <label for="password"/><span style="color:#FFFFFF; font-family:'Trebuchet MS', Arial, Helvetica, sans-serif;">password:</span></label>

    <input type="password" name="mypassword" id="password"/>

    <label for="submit"></label>

    <input type="submit" name="sumbit" value="Login">

  </form>

</div>

PHP

mysql_connect ($host, $username, $password) or die ("can't connect");
mysql_select_db ($db_name) or die (mysql_error());

$myusername = $_POST['myusername'];
$mypassword = $_POST['mypassword'];

$sql = "SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";
$result = mysql_query($sql);

$count = mysql_num_rows($result);
if ($count == 1){
 session_register("myusername");
 session_register("mypassword");
 header("Location:cms/admin.php");
}else{
 echo "Wrong username or password";
}

Answer 1

哇。这是一个大禁忌:

$myusername = $_POST['myusername'];
$mypassword = $_POST['mypassword'];

您至少需要使用 mysql_real_escape_string 来清理这些输入。

改成这样:

$myusername = mysql_real_escape_string($_POST['myusername']);
$mypassword = mysql_real_escape_string($_POST['mypassword']);

htmlentities() 和 htmlspecialchars() 也很有用，但我建议不要对进入数据库的数据使用它们。