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Adding functionality to this login script

spadez

By spadez
in Third Party Scripts

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spadez Newbie

spadez

Posted
Posted

Hi,

 

Im very new to php programming. However ive found a basic but solid login script with remember me feature that I would like to try and build upon. Here is a link to the script: http://www.evolt.org/node/60265. Ive posted two of the script files below that deal with logging in and registration (there are other files but im not sure if they are relevant for this modification:

 

Register.php

<?
session_start(); 
include("database.php");

/**
* Returns true if the username has been taken
* by another user, false otherwise.
*/
function usernameTaken($username){
   global $conn;
   if(!get_magic_quotes_gpc()){
      $username = addslashes($username);
   }
   $q = "select username from users where username = '$username'";
   $result = mysql_query($q,$conn);
   return (mysql_numrows($result) > 0);
}

/**
* Inserts the given (username, password) pair
* into the database. Returns true on success,
* false otherwise.
*/
function addNewUser($username, $password){
   global $conn;
   $q = "INSERT INTO users VALUES ('$username', '$password')";
   return mysql_query($q,$conn);
}

/**
* Displays the appropriate message to the user
* after the registration attempt. It displays a 
* success or failure status depending on a
* session variable set during registration.
*/
function displayStatus(){
   $uname = $_SESSION['reguname'];
   if($_SESSION['regresult']){
?>

<h1>Registered!</h1>
<p>Thank you <b><? echo $uname; ?></b>, your information has been added to the database, you may now <a href="main.php" title="Login">log in</a>.</p>

<?
   }
   else{
?>

<h1>Registration Failed</h1>
<p>We're sorry, but an error has occurred and your registration for the username <b><? echo $uname; ?></b>, could not be completed.<br>
Please try again at a later time.</p>

<?
   }
   unset($_SESSION['reguname']);
   unset($_SESSION['registered']);
   unset($_SESSION['regresult']);
}

if(isset($_SESSION['registered'])){
/**
* This is the page that will be displayed after the
* registration has been attempted.
*/
?>

<html>
<title>Registration Page</title>
<body>

<? displayStatus(); ?>

</body>
</html>

<?
   return;
}

/**
* Determines whether or not to show to sign-up form
* based on whether the form has been submitted, if it
* has, check the database for consistency and create
* the new account.
*/
if(isset($_POST['subjoin'])){
   /* Make sure all fields were entered */
   if(!$_POST['user'] || !$_POST['pass']){
      die('You didn\'t fill in a required field.');
   }

   /* Spruce up username, check length */
   $_POST['user'] = trim($_POST['user']);
   if(strlen($_POST['user']) > 30){
      die("Sorry, the username is longer than 30 characters, please shorten it.");
   }

   /* Check if username is already in use */
   if(usernameTaken($_POST['user'])){
      $use = $_POST['user'];
      die("Sorry, the username: <strong>$use</strong> is already taken, please pick another one.");
   }

   /* Add the new account to the database */
   $md5pass = md5($_POST['pass']);
   $_SESSION['reguname'] = $_POST['user'];
   $_SESSION['regresult'] = addNewUser($_POST['user'], $md5pass);
   $_SESSION['registered'] = true;
   echo "<meta http-equiv=\"Refresh\" content=\"0;url=$HTTP_SERVER_VARS[php_SELF]\">";
   return;
}
else{
/**
* This is the page with the sign-up form, the names
* of the input fields are important and should not
* be changed.
*/
?>

<html>
<title>Registration Page</title>
<body>
<h1>Register</h1>
<form action="<? echo $HTTP_SERVER_VARS['PHP_SELF']; ?>" method="post">
<table align="left" border="0" cellspacing="0" cellpadding="3">
<tr><td>Username:</td><td><input type="text" name="user" maxlength="30"></td></tr>
<tr><td>Password:</td><td><input type="password" name="pass" maxlength="30"></td></tr>
<tr><td colspan="2" align="right"><input type="submit" name="subjoin" value="Join!"></td></tr>
</table>
</form>
</body>
</html>


<?
}
?>

 

Login.php

<?

/**
* Checks whether or not the given username is in the
* database, if so it checks if the given password is
* the same password in the database for that user.
* If the user doesn't exist or if the passwords don't
* match up, it returns an error code (1 or 2). 
* On success it returns 0.
*/
function confirmUser($username, $password){
   global $conn;
   /* Add slashes if necessary (for query) */
   if(!get_magic_quotes_gpc()) {
$username = addslashes($username);
   }

   /* Verify that user is in database */
   $q = "select password from users where username = '$username'";
   $result = mysql_query($q,$conn);
   if(!$result || (mysql_numrows($result) < 1)){
      return 1; //Indicates username failure
   }

   /* Retrieve password from result, strip slashes */
   $dbarray = mysql_fetch_array($result);
   $dbarray['password']  = stripslashes($dbarray['password']);
   $password = stripslashes($password);

   /* Validate that password is correct */
   if($password == $dbarray['password']){
      return 0; //Success! Username and password confirmed
   }
   else{
      return 2; //Indicates password failure
   }
}

/**
* checkLogin - Checks if the user has already previously
* logged in, and a session with the user has already been
* established. Also checks to see if user has been remembered.
* If so, the database is queried to make sure of the user's 
* authenticity. Returns true if the user has logged in.
*/
function checkLogin(){
   /* Check if user has been remembered */
   if(isset($_COOKIE['cookname']) && isset($_COOKIE['cookpass'])){
      $_SESSION['username'] = $_COOKIE['cookname'];
      $_SESSION['password'] = $_COOKIE['cookpass'];
   }

   /* Username and password have been set */
   if(isset($_SESSION['username']) && isset($_SESSION['password'])){
      /* Confirm that username and password are valid */
      if(confirmUser($_SESSION['username'], $_SESSION['password']) != 0){
         /* Variables are incorrect, user not logged in */
         unset($_SESSION['username']);
         unset($_SESSION['password']);
         return false;
      }
      return true;
   }
   /* User not logged in */
   else{
      return false;
   }
}

/**
* Determines whether or not to display the login
* form or to show the user that he is logged in
* based on if the session variables are set.
*/
function displayLogin(){
   global $logged_in;
   if($logged_in){
      echo "<h1>Logged In!</h1>";
      echo "Welcome <b>$_SESSION[username]</b>, you are logged in. <a href=\"logout.php\">Logout</a>";
   }
   else{
?>

<h1>Login</h1>
<form action="" method="post">
<table align="left" border="0" cellspacing="0" cellpadding="3">
<tr><td>Username:</td><td><input type="text" name="user" maxlength="30"></td></tr>
<tr><td>Password:</td><td><input type="password" name="pass" maxlength="30"></td></tr>
<tr><td colspan="2" align="left"><input type="checkbox" name="remember">
<font size="2">Remember me next time</td></tr>
<tr><td colspan="2" align="right"><input type="submit" name="sublogin" value="Login"></td></tr>
<tr><td colspan="2" align="left"><a href="register.php">Join</a></td></tr>
</table>
</form>

<?
   }
}


/**
* Checks to see if the user has submitted his
* username and password through the login form,
* if so, checks authenticity in database and
* creates session.
*/
if(isset($_POST['sublogin'])){
   /* Check that all fields were typed in */
   if(!$_POST['user'] || !$_POST['pass']){
      die('You didn\'t fill in a required field.');
   }
   /* Spruce up username, check length */
   $_POST['user'] = trim($_POST['user']);
   if(strlen($_POST['user']) > 30){
      die("Sorry, the username is longer than 30 characters, please shorten it.");
   }

   /* Checks that username is in database and password is correct */
   $md5pass = md5($_POST['pass']);
   $result = confirmUser($_POST['user'], $md5pass);

   /* Check error codes */
   if($result == 1){
      die('That username doesn\'t exist in our database.');
   }
   else if($result == 2){
      die('Incorrect password, please try again.');
   }

   /* Username and password correct, register session variables */
   $_POST['user'] = stripslashes($_POST['user']);
   $_SESSION['username'] = $_POST['user'];
   $_SESSION['password'] = $md5pass;

   /**
    * This is the cool part: the user has requested that we remember that
    * he's logged in, so we set two cookies. One to hold his username,
    * and one to hold his md5 encrypted password. We set them both to
    * expire in 100 days. Now, next time he comes to our site, we will
    * log him in automatically.
    */
   if(isset($_POST['remember'])){
      setcookie("cookname", $_SESSION['username'], time()+60*60*24*100, "/");
      setcookie("cookpass", $_SESSION['password'], time()+60*60*24*100, "/");
   }

   /* Quick self-redirect to avoid resending data on refresh */
   echo "<meta http-equiv=\"Refresh\" content=\"0;url=$HTTP_SERVER_VARS[php_SELF]\">";
   return;
}

/* Sets the value of the logged_in variable, which can be used in your code */
$logged_in = checkLogin();

?>

 

What I would like to do it, is on registration have them type in their email and password twice, and then verify that the two are the same upon submission. If they arnt, I want it to print an error just like it does it a user hasnt filled in one of the fields. Can anyone shead some light on the best way to attempt this?

 

Thanks!

 

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