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[help] Improve login script
#1
I am fairly new at php and just wrote this login script. Please rate, suggest and comment.
For any questions about the script you can send me a pm or comment.
I am from the Netherlands by the way. Thanks for commenting!Blackhat

Login form
PHP Code:
<?php session_start();?>
<html>
<head>
<title>Inlog</title>
</head>
<body>
<form id='loginform' name='frm' method='POST' action='?action=login'>
                <table id='logintable' cellpadding='0' cellspacing='10' border='0'>
                <tr><td>Email:</td><td><input type='text' name='email' size='20'></td></tr>
                <tr><td>Password:</td><td><input type='password' name='password' size='20'></td></tr>
                <tr><td style="border-bottom: 1px solid #000"></td><td><input type='submit' value='Login' name='login'></td></tr>
                <tr><td>Als je nog geen account hebt,<td><a href="registratie.php">registreer een account.</a></tr>
</form>
<?php
include("include/sanitize.php");
include(
"connect.php");
$email sanitize($_POST['email']);
$password sanitize($_POST['password']);
$sql = ("SELECT * FROM `members` WHERE `email` = ('".$email."')");
$ophalen mysql_query($sql) or die(mysql_error());
$aantal mysql_num_rows($ophalen);
if (
$_GET["action"] == "login")
{
    if((
$aantal == 0))
        {
        echo
"<p>Niet alle gegevens zijn goed ingevuld. Vul de gegevens opnieuw in.</p>";
        }
    else{
        while(
$record mysql_fetch_object($ophalen))
            {
            
$password_db $record->password;
            
$id $record->Id_nummer;
            }
        require (
"PassHash.php");
        if (
PassHash::check_password($password_db$password))
            {
            
?><meta http-equiv="refresh" content="0;url=beheer.php" /><?php;
            
$_SESSION['id-nummer'] = "$id";
            }
        else
            {
            echo
"<p>Niet alle gegevens zijn goed ingevuld. Vul de gegevens opnieuw in.</p>";
            }
        }
}
?>
</body>
</html> 

PassHash
PHP Code:
<?php
    
class PassHash {
  private static 
$algo '$2a';  
  private static 
$cost '$10';   
  public static function 
unique_salt() {  
    return 
substr(sha1(mt_rand()),0,22);  
  }  
  public static function 
hash($password) {  
    return 
crypt($password,  
    
self::$algo .  
    
self::$cost .  
    
'$' self::unique_salt());  
  }  
  public static function 
check_password($hash$password) {  
    
$full_salt substr($hash029);  
    
$new_hash crypt($password$full_salt);  
    return (
$hash == $new_hash);  
  }  
    }
?>

Registration page
PHP Code:
<title>Registratie</title>
</
head>
<
body>
<?
php
$code
="cryptografie";
$codewoord=$_POST["codewoord"];
if(
$_POST['submit']){
    if(
$code==$codewoord)
    {
    include(
"connect.php");
    include(
"include/sanitize.php");
    
$naam sanitize($_POST['naam']);
    
$email sanitize($_POST['email']);
    
$password0 sanitize($_POST['password0']);
    
$password1 sanitize($_POST['password1']);
        if (
$password0 !== $password1){
        echo 
"De wachtwoorden zijn niet aan elkaar gelijk. Probeer het opnieuw.";
        }
        else{
            require (
"PassHash.php");
            
$pass_hash PassHash::hash($_POST['password0']);
            
$sql_aanmelding = ("INSERT INTO `862697_test`.`members` (`naam`, `email`, `password`, `datum`) VALUES ('" $naam "', '"$email "', '"$pass_hash "', NOW())");
            
$verzenden mysql_query($sql_aanmelding);
            echo
"Beste ".$naam.", je aanmelding is goed doorgekomen, je kunt nu inloggen. <br />";
            echo
'Klik <a href="/">hier</a> om terug naar de loginpagina te gaan.';
        }
    }
    else{
  echo 
"Codewoord klopt niet. <br />";
  echo
'Klik <a href="registratie.php">hier</a> om terug naar de registratiepagina te gaan.';
    }
}

else{
?>
<form name='loginform' action="registratie.php" method="post">
<table id='logintable' cellpadding='0' cellspacing='10' border='0'>
<TR><TD>Naam: <TD><input type="text" name="naam">
<TR><TD>E-mail: <TD><input type="text" name="email">
<TR><TD>Wachtwoord: <TD><input type="password" name="password0">
<TR><TD>Wachtwoord herhalen: <TD><input type="password" name="password1">
<TR><TD>Codewoord: <TD><input type="password" name="codewoord">
<TR><TD><TD><input type='submit' value='Submit' name='submit'>
</form>
<?php
}
?>
</body>
</html> 

Password verification page
PHP Code:
<?php
    session_start
();
    if (
$_GET["action"] == "logout") {
        unset(
$_SESSION["id-nummer"]);
        
session_unset();
        
header("Location: /");
        }
    if (isset(
$_SESSION['id-nummer'])){
        include(
"connect.php");
        
$via $_GET["Dropmenu"];
        
$naam_sql "SELECT * FROM `862697_test`.`members` WHERE `Id_nummer` = '".$_SESSION['id-nummer']."' ";
        
$naam mysql_query($naam_sql);
        while(
$record mysql_fetch_object($naam)){
        echo
'Welkom ' .$record->naam', fijn dat je er weer bent. <a href="?action=logout">Uitloggen</a>';
    }
echo 
"logged in"
    
}
    else{
echo 
"not logged in"
        
}
?>
Reply
#2
It's generally bad practice to use static properties/methods due to their globalised scope. Also, it would be better if you opted to eschew the original MySQL functions, due to their outdated nature (and they're currently in deprecation). Try MySQLi or PDO since you're using the object-oriented paradigm.

I'd also like to see the sanitise.php file as well, because I'm curious how you're protecting yourself form both XSS and SQLi attacks with that one function. I assume you're using functions like htmlspecialchars() or htmlentities() to prevent XSS attacks; however these escaping functions should only be invoked upon outputting data from the database (not when inputting data). Information inside the database should be kept intact until you're manipulating it as a general rule of thumb.
Reply


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