cookie base64_decode无法正常工作

Question

Im trying to set a cookie when the user selects the checkbox to remember his data. I´m setting cookie and encoding if checkbox is selected:

if($f['save'])
{
$cookiesave = base64_encode($adminEmail).'&'.base64_encode($f['pass']);
setcookie('admin',$cookiesave,time()+60*60*24*30,'/');         
}

And then I´m decoding

elseif(!empty($_COOKIE['admin']))
            {
                $cookie = $_COOKIE['admin'];
                $cookie = explode('&',$cookie);
                $f['email'] = base64_decode($cookie[0]);
                $f['pass'] = base64_decode($cookie[1]);
                $f['save'] = 1;
            }

But despite being doing the decode, the input appears with encrypted password. I have reviewed all the code and everything seems to be right ... can see anything wrong?

My full code:

 <?php
        if(isset($_POST['sendLogin']))
         {
            $f['email'] = mysql_real_escape_string($_POST['email']);
            $f['pass']  = mysql_real_escape_string($_POST['pass']);
            $f['save']  = mysql_real_escape_string($_POST['remember']);

                $autEmail = $f['email'];
                $autSenha = md5($f['pass']);
                $readAdmin = read('admins',"WHERE email = '$adminEmail'");
                if($readADmin){
                    foreach($readAdmin as $admin);
                    if($adminEmail == $admin['email'] && $adminPass == $admin['pass'])
                    {
                        if($f['save'])
                        {
                            $cookiesave = base64_encode($adminEmail).'&'.base64_encode($f['pass']);
                            setcookie('admin',$cookiesave,time()+60*60*24*30,'/');
                        }
                        else
                        {
                            setcookie('admin','',time()+3600,'/');
                        }
                    }

                    else
                    {
                        echo 'Wrong Password';
                    }
                }
                else
                {
                    echo 'Email dont exist in DB';
                }
            }

        }
        elseif(!empty($_COOKIE['admin']))
        {
            $cookie = $_COOKIE['admin'];
            $cookie = explode('&',$cookie);
            $f['email'] = base64_decode($cookie[0]);
            $f['pass'] = base64_decode($cookie[1]);
            $f['save'] = 1;
        }
            echo '<pre>';
            print_r($cookie);
            echo
               '</pre>';
    ?>

        <?php
        if(!isset($_GET['remember']))
        {
        ?>
        <form name="login" action="" method="post">
            <label>
                <span>Email:</span>
                <input type="text" class="radius" name="email" value="<?php if(isset($f['email'])) echo $f['email']; ?>" />
            </label>
            <label>
                <span>Password:</span>
                <input type="password" class="radius" name="pass" value="<?php if(isset($f['pass'])) echo $f['pass']; ?>" />
            </label>
            <input type="submit" value="Login" name="sendLogin" class="btn" />

            <div class="remember">
                <input type="checkbox" name="remember" value="1" <?php if(isset($f['save'])) echo 'checked="checked"' ?> /> 
                Remember Acess data!
            </div>
        </form>
        <?php
        }

Answer 1

This is a tested login form (PHP 5.3.18). The comments at the start of the script explains how it works and how to use it.

<?php
/*
 * Q22459571
 *
 * a Login script:
 *
 * There are three actions it will do:
 *
 * 1) Display a login screen and process the results
 *
 * 2) Logout a user who has been 'remembered' or 'saved' see 'admin' cookie.
 *
 * 3) Automatically login a user from the details in the admin' cookie.
 *
 * The script action is controlled by a parameter in the URL called 'action'.
 *
 * The 'action' values and results are as follows:
 *
 * 1) action='login'   : will clear any cookies and force the login screen to be shown
 *
 * 2) action='logout'  : will clear any cookies and exit the script
 *
 * 3) missing 'action' parameter : a) try and login using the 'admin' cookie.
 *                                 b) show the login screen if not
 *                                    able to login.
 *
 * The result of the script will be saved in a '$userAuth' array as follows:
 *
 * 1) 'email'       => user email address as stored on the db.
 * 2) 'passhash'    => MD5 hash as stored on the database
 * 3) 'remember'    => boolean to indicate that the user can be logged in
 *                     via the 'admin' cookie
 * 4) 'loginMethod' => '', 'cookie', 'form'
 * 5) 'loginSuccess'=> true | false
 *
 */

/*
 * We will use 'mysqli' functions, prepared queries and 'bind' variables/values
 */

/*
 * User table:
 *
 * store password as a 'salted' hash
 *
 * Columns: 1) email    -- unique id for an admin
 *          2) passhash -- password as a MD5 hash
 *          3) salt     -- random string that we will use as a prefix to the plaintext password
 *                         before we take the md5 hash.
 */

// database connection...
$mysqlDb = mysqli_connect('localhost', 'test', 'test', 'testmysql');

// User Authorization details will always be in here...
$userAuth = array( 'email' => '', 'passhash' => '', 'remember' => false,
                   'loginMethod' => '', 'loginSuccess' => false);

// set the login action so we can use it later
$loginAction = isset($_GET['action']) ? $_GET['action'] : '';

/*
 * see what the URL action is
 */
if ($loginAction == 'logout')
{
  setcookie('admin', '' , 0, '/'); // delete cookie
  echo 'user logged out';          // do what you wish here
  exit;                            // leave the script
}


if ($loginAction == 'login')
{
  if (!empty($_COOKIE['admin'])) // clear the cookie to force login
  {
    setcookie('admin', '' , time() + 3600, '/'); // will be empty next time
  }
}
elseif (!empty($_COOKIE['admin'])) // The cookie should be encrypted -- not in this version.
{
   $cookie = $_COOKIE['admin'];
   $emailLen = substr($cookie, 0, 3); // get the length

   $b64 = substr($cookie, 3); // get b64 encoded string
   $b64decoded = base64_decode($b64); // convert back to original string

    // split it up...
   $userAuth['email'] = substr($b64decoded, 0, $emailLen);
   $userAuth['passhash']  = substr($b64decoded, $emailLen);
   $userAuth['remember' ]  = 1;


   // ensure user is in the database and the details match...
   $sql = 'SELECT email, salt from admins WHERE email = ? and passhash = ? limit 1';
   $query = mysqli_prepare($mysqlDb, $sql);
   $allOk = mysqli_stmt_bind_param($query, 'ss', $userAuth['email'], $userAuth['passhash']);
   $allOk = mysqli_execute($query);
   $queryResult = mysqli_stmt_get_result($query);
   $admin = mysqli_fetch_array($queryResult);

   $userAuth['loginMethod'] = 'cookie';
   $userAuth['loginSuccess'] =    !empty($admin['email'])
                               && $admin['email'] === $userAuth['email'];


   if ($userAuth['loginSuccess'])
   {
      echo 'user: ', $userAuth['email'], ' was logged in via the cookie...';
      exit;
   }
   else
   {
      echo 'user: ', $userAuth['email'], ' cookie details are wrong!!';
      exit;
   }
}


/*
 * We may have a login request that we need to check...
 */
 if (isset($_POST['sendLogin'])) // new login attempt
 {
   $userAuth['loginMethod'] = 'form';
   $userAuth['loginSuccess'] = false;

   $userAuth['email']     = mysqli_real_escape_string($mysqlDb, $_POST['email']);
   $userPass              = mysqli_real_escape_string($mysqlDb, $_POST['pass']);
   $userAuth['remember']  = mysqli_real_escape_string($mysqlDb, $_POST['remember']);



    // will use prepared queries and bind parameters as required
    $sql = 'SELECT email, passhash, salt from admins WHERE email = ? limit 1';
    $query = mysqli_prepare($mysqlDb, $sql);
    $allOk = mysqli_stmt_bind_param($query, 's', $userAuth['email']);
    $allOk = mysqli_execute($query);

    $queryResult = mysqli_stmt_get_result($query);
    $admin = mysqli_fetch_array($queryResult); // admin details

    if (   !empty($userAuth['email']) && $userAuth['email'] == $admin['email']
        && !empty($userPass))
    {
      // calculate the MD5 hash and assume it is ok
      $userAuth['passhash'] = md5($admin['salt'] . $userPass);
    }


    if (!empty($userAuth['passhash']) && $userAuth['passhash'] === $admin['passhash']) // passwords must have matched
    {
        $userAuth['loginSuccess'] = true;
        if ($userAuth['remember' ])
        {
           $emailLen = sprintf('%03u', strlen($userAuth['email']));
           $cookiesave = $emailLen . base64_encode($userAuth['email'] . $userAuth['passhash']);
           setcookie('admin', $cookiesave, time() + 60 * 60 * 24 * 30, '/');
        }
        else
        {
           setcookie('admin', '' , 0, '/'); // delete cookie
        }
    }
    else
    {
        setcookie('admin', '' , 0, '/'); // delete cookie if unsuccessful login
        echo 'Wrong Email / Password or both';
    }
 } // end of form login

// if successful login
if ($userAuth['loginSuccess'])
{
  echo 'user: ', $userAuth['email'], ' is  logged in via: ', $userAuth['loginMethod'];
  exit;
}

?>

<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Enter Login Details</title>
  </head>

  <body>
  <form name="login" action="/testmysql/Q22459571_cookie_base64.php
        " method="post">
      <label>
          <span>Email:</span>
          <input type="text" class="radius" name="email" value="<?php echo $userAuth['email']; ?>" />
      </label>
      <label>
          <span>Password:</span>
          <input type="password" class="radius" name="pass" value="" />
      </label>

      <div class="remember">
          <input type="checkbox" id="remember" name="remember" value="1" <?php echo 'checked="checked"' ?> />
          <label  for="remember">Remember Me!</label>
      </div>

    <input type="submit" value="Login"  name="sendLogin" class="btn" />
  </form>
  </body>
</html>