PHP CMS登录黑客

Question

最近有人攻击我的PHP CMS并种植了SQL注入.有没有办法让我的登录代码更受保护并防止黑客入侵？任何帮助都会很棒,谢谢.

登录表格

<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.这是一个很大的禁忌:

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

至少需要对这些输入进行消毒mysql_real_escape_string.

把它改成这个:

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

htmlentities()并且htmlspecialchars()也很有用,但我建议不要在进入数据库的数据中使用它们.