我从中进行搜索,当用户键入关键字时,脚本将在数据库中查找该关键字:
<form method="GET">
<input type="text" name="q" id="keyword" placeholder="Enter a keyword" >
<input type="submit" value="Search" >
</form>
提交表单后,我检查以下内容:
//Check is the form is submitted.
if( isset($_GET['q']) ){
//Assign the submitted keyword to a variable.
$query = $_GET['q'];
//Check if the keyword is empty.
if(!empty($query)){
//Check if the keyword matches the pattern.
//The pattern checks that the keyword contains characters from any language and maybe there are spaces between them.
$pattern = "~^\p{L}[\p{L}\p{M}\h()]*$~u";
//If the keyword matches the pattern.
if(preg_match($pattern, $query)){
//Fetch data from the Database.
$stmt = $conn->prepare('SELECT * FROM posts WHERE title OR description LIKE :s LIMIT 5');
$stmt->bindValue(':s', '%' . $query . '%', PDO::PARAM_STR);
$stmt->execute();
$posts = $stmt->fetchAll();
}
}
这些检查是否足以阻止SQL注入和其他攻击?
还是我需要创建一个黑名单?还是检查其他内容?
答案 0 :(得分:3)
由于您正在使用参数化查询,因此根本不需要正则表达式。参数化查询与仅连接参数之间的区别在于最终如何执行查询。例如:
query q = "SELECT * FROM people WHERE people.age =" + userInput;
这样,查询将被串联,然后纯粹执行。在您的情况下,您要将用户输入作为参数传递:
query q = "SELECT * FROM posts WHERE title OR description LIKE :s LIMIT 5"
不会直接连接采石场,而是将比较参数s
的值。确保您始终使用参数化查询,因为这是一种好习惯,而且方法更安全