我是php的新手，我正在进行Web应用程序开发，以便能够遇到不同的技能，问题并找到解决问题的方法。
现在正在创建一个注册表单并验证表单并保护它免受SQL注入和XSS的攻击。 注意我理解可以使用预备声明，但是对于我的技能水平，我认为从Mysqli程序开始，对我的开发来说是最好的结果，直到填充足够自信。
所以我只想让你的专家看看我是否需要删除或添加或使用（除了stmt）。
这是我的注册页面。
<?php
// define mqsqli real escape string function
function _olaskee($escape) {
$escape = htmlspecialchars ($escape, ENT_QUOTES, 'UTF-8');
$escape = trim ($escape, ENT_QUOTES, 'UTF-8');
$escape = stripcslashes ($escape, ENT_QUOTES, 'UTF-8');
return $escape;
}
// start session
session_start();
// include database connection
//require_once('include/connection.php');
// if user type already detected, redirect to index.php
if(isset($_SESSION['user_type'])){
header('Location: index.php');
}
// check if we have submited / if the for as being submitted
if(!empty($_POST['submit'])){
//instantiate
$firstname = _olaskee($con, $_POST['firstname']);
$lastname = _olaskee($con, $_POST['lastname']);
$user_name = _olaskee($con, $_POST['user_name']);
$user_type = _olaskee($con, $_POST['user_type']);
$password = _olaskee($con, $_POST['password']);
$confirm_password = _olaskee($con, $_POST['confirm_password']);
// hash password
$hashed_password = password_hash($password, PASSWORD_BCRYPT, ['cost' => 12]);
// include database connection
require_once('include/errMsg.php');
}
// include page title
$title = 'Registration Page';
// include header layout
require_once('include/header.php');
?>
<div>
<form name="register" action="<?php echo htmlspecialchars($_SERVER['PHP_SELF'], ENT_QUOTES, 'UTF-8'); ?>" method="post">
<table>
<tr>
<td>First Name</td>
<td><input type="text" name="firstname" value='<?php// echo htmlspecialchars ($firstname) ?>'><br><span style='color: red'><?php echo $fnErr ?></span></td>
<?php echo $firstname ; ?>
</tr>
<tr>
<td>Last Name</td>
<td><input type="text" name="lastname" value='<?php echo htmlspecialchars ($lastname) ?>'><br><span style='color: red'><?php echo $lnErr ?></span></td>
</tr>
<tr>
<td>User Name</td>
<td><input type="text" name="user_name" value='<?php echo htmlspecialchars ($user_name) ?>'><br><span style='color: red'><?php echo $unameErr ?></span></td>
</tr>
<tr>
<td>User Type</td>
<td>
<!-- <label for="flavor">Select User Type:</label > -->
<select id="user_type" name='user_type' >
<option value="">Select User Type</option>
<option <?php echo $user_type=='rsw'?'selected':''; ?> >rsw</option>
<option <?php echo $user_type=='sp'?'selected':''; ?> >sp</option>
</select>
<span style='color: red'><?php echo $u_typeErr?></span>
</td>
</tr>
<tr>
<td>Email</td>
<td><input type="email" name="email" value='<?php echo htmlspecialchars ($email) ?>'><br /><span style='color: red'><?php echo $emailErr ?></span></td>
</tr>
<tr>
<td>Password:</td>
<td><input type="password" name="password" id="password"><br /><span style='color: red'><?php echo $passErr ?></span></td></td>
</tr>
<tr>
<td>Confirm Password:</td>
<td><input type="password" name="confirm_password" id="confirm_password"><br /><span style='color: red'><?php echo $cpassErr ?></span></td></td>
</tr>
<tr>
<td></td>
<td><input type="submit" name="submit" value="Register"><a href='index.php'> Login</a></td>
</tr>
</table>
</form>
</div>
<?php
if(is_file('include/footer.php'))
include_once('include/footer.php');
?>
这是我的错误消息页
<?php
// error handler variable
$fnErr = $lnErr = $unameErr = $u_typeErr = $emailErr = $passErr = $cpassErr = '';
$firstname = $lastname = $user_name = $user_type = $email = $password = $confirm_password = '';
// if submit, then validate
$firstname = ($_POST['firstname']);
// set field validation for first name
if (empty($firstname)){
$fnErr = 'Field empty, please enter your first name';
}else{
if (strlen($firstname) < 3){
$fnErr = 'First Name is too short';
}
}
// check if name only contains letters and whitespace
if (!preg_match("/^[a-zA-Z ]*$/",$firstname)) {
$fnErr = "Only letters and white space allowed";
}
// set field validation for last name
$lastname = ($_POST['lastname']);
if (empty($lastname)){
$lnErr = 'Field empty, please enter your last name';
}else{
if (strlen($lastname) < 3){
$lnErr = 'Last Name is too short';
}
}
// check if name only contains letters and whitespace
if (!preg_match("/^[a-zA-Z ]*$/",$lastname)) {
$lnErr = "Only letters and white space allowed";
}
// set field validation for user name
$user_name = ($_POST['user_name']);
if (empty($user_name)){
$unameErr = 'Field empty, please enter user name';
}else{
if (strlen($user_name) < 6){
$unameErr = 'Password is too short';
}else{
if (strlen($user_name) > 15){
$unameErr = 'Password is too long';
}
}
}
// check if name only contains letters and whitespace
if (!preg_match("#.*^(?=.*[a-z])(?=.*[A-Z]).*$#",$user_name)) {
$unameErr = "At least one CAPS, letters and white space allow";
}
// check if user select user type from list
$user_type = ($_POST['user_type']);
if (empty($user_type)){
$u_typeErr = 'Please select user type from list';
}
// set email filter validation
$email = ($_POST['email']);
if (empty($email)){
$emailErr = 'Field empty, please enter your last name';
}else{
// check if e-mail address is well-formed
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
$emailErr = "Invalid email format";
}
}
// set field validation for password
$password = ($_POST['password']);
if (empty($password)){
$passErr = 'Field empty, please create a password';
}else{
if (strlen($password) < 6){
$passErr = 'Password is too short';
}else{
if (strlen($password) > 15){
$passErr = 'Password is too long';
}
}
}
if( !preg_match("#[A-Z]+#", $password) ) {
$passErr = "Password must include at least one CAPS! ";
}else{
if( !preg_match("#[0-9]+#", $password) ) {
$passErr = "Password must include at least one NUMBER! ";
}
}
// // // check if name only contains letters and whitespace
// if (preg_match("#.*^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9]).*$#", $password)) {
// $passErr = "Try again... Password must contain NUMBER, LETTER and CAPS";
// }
// set field validation for confirm password
$confirm_password = ($_POST['confirm_password']);
if (empty($confirm_password)){
$cpassErr = 'Field empty, please confirm your password';
}else{
if ($password != $confirm_password) {
$cpassErr = 'Error... Passwords do not match';
}
}
// // define mqsqli real escape string function
// function _olaskee($escape) {
// $escape = htmlspecialchars ($escape, ENT_QUOTES, 'UTF-8');
// $escape = trim ($escape, ENT_QUOTES, 'UTF-8');
// $escape = stripcslashes ($escape, ENT_QUOTES, 'UTF-8');
// return $escape;
// }
?>
注意已在两个页面中注释掉了一些行。
同样在注册页面中包含会话顶部的安全功能，确定是否正确。
还使用了密码哈希，但我还没有在数据库上测试，但是（我使用过它了吗？）
请稍等一下，给我你的专家意见
最好的问候
答案 0 :(得分：0)
我不是专家，但我可以给你一些笔记。在您的清理功能_olaskee中，我认为您需要了解这些功能的作用以及如何使用它
你在这里不需要stripcslashes。这个函数删除斜线你为什么把它放在这里？
您不需要清理密码。您将在使用它之前对其进行哈希处理，并且哈希将替换任何注入的代码
要对SQL Injection进行清理，您需要使用mysqli_real_escape_string它将负责清理字符串。
查看filter_var功能。您会发现它在消毒和验证输入方面非常有用。此函数允许您根据指定的长度进行验证，允许某些输入中的某些HTML标记（如textarea）等等
要了解如何保护自己免受攻击，首先需要了解攻击是如何进行的。阅读有关SQL注入的信息，看看是否可以通过易受攻击的代码破解数据库。
您也可以尝试使用ZAP工具。您只需传递网站的网址即可使用自动扫描，它会自动扫描您的网络应用并报告发现的任何漏洞
学习如何建立登录系统是很好的。但对于真实世界的应用程序，建议不要建立自己的登录系统。始终依赖经过测试和批准的软件，否则您将创建充满漏洞的系统。祝你好运！