sessions.php
author Dan
Wed, 08 Oct 2008 21:56:21 -0400
changeset 56 53b0f0d7ff6f
parent 44 92dd253f501c
child 74 7719085707d8
permissions -rw-r--r--
Fixed wrong PID variable in httpd fork
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<?php
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/**
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 * Greyhound - real web management for Amarok
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 * Copyright (C) 2008 Dan Fuhry
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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function greyhound_login_page($httpd, $socket)
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{
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  if ( session_check() )
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  {
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    $httpd->header('HTTP/1.1 307 Temporary Redirect');
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    $httpd->header('Location: /');
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    return;
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  }
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  $tried = false;
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  $success = false;
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  if ( isset($_POST['username']) && isset($_POST['password']) )
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  {
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    $tried = true;
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    if ( $sessionid = login($_POST['username'], $_POST['password']) )
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    {
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      $success = true;
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      $httpd->setcookie('grey_session', $sessionid, time() + ( 86400 * 3650 ));
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    }
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  }
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  global $theme;
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  $iphone = ( ( strpos($_SERVER['HTTP_USER_AGENT'], 'iPhone') ||
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       strpos($_SERVER['HTTP_USER_AGENT'], 'iPod') ||
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       strpos($_SERVER['HTTP_USER_AGENT'], 'BlackBerry') ||
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       isset($_GET['m']) )
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       && !isset($_GET['f'])
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       );
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  $theme_id = ( $iphone ) ? 'iphone' : $theme;
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  $smarty = load_theme($theme_id);
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  $smarty->assign('theme', $theme_id);
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  $smarty->assign('greyhound_version', GREY_VERSION);
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  $smarty->assign('tried', $tried);
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  $smarty->assign('success', $success);
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  $smarty->display('login.tpl');
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}
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function greyhound_logout($httpd, $socket)
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{
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  // destroy the session
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  if ( isset($_COOKIE['grey_session']) )
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  {
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    load_session_data();
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    global $session_data;
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    unset($session_data[$_COOKIE['grey_session']]);
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    session_commit_db();
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  }
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  $httpd->setcookie('grey_session', '', time() - 864000);
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  $httpd->header('HTTP/1.1 307 Temporary Redirect');
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  $httpd->header('Location: /');
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}
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/**
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 * Check to see if we're logged in
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 */
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function session_check()
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{
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  global $use_auth, $auth_data;
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  if ( isset($_COOKIE['grey_session']) )
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  {
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    load_session_data();
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    global $session_data;
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    if ( isset($session_data[$_COOKIE['grey_session']]) )
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    {
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      // has a cookie with a valid session ID, check credentials
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      $session =& $session_data[$_COOKIE['grey_session']];
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      if ( isset($auth_data[$session['user']]) )
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      {
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        if ( $session['hash'] === md5($auth_data[$session['user']] . $session['salt']) )
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        {
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          // session is valid, logged in
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          return true;
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        }
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      }
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    }
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  }
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  return ( $use_auth ) ? false : true;
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}
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function login($username, $password)
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{
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  global $use_auth, $auth_data;
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  if ( !$use_auth )
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    return false;
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  if ( isset($auth_data[$username]) )
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  {
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    if ( $auth_data[$username] === $password )
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    {
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      return create_session($username, $password);
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    }
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  }
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  return false;
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}
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function create_session($username, $password)
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{
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  load_session_data();
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  global $session_data;
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  $sessid = md5(sha1(microtime() . mt_rand()));
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  $salt = md5(sha1(md5(mt_rand() . microtime() . microtime() . mt_rand())));
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  $session_data[$sessid] = array(
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      'user' => $username,
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      'hash' => md5($password . $salt),
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      'salt' => $salt
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    );
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  session_commit_db();
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  return $sessid;
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}
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function var_export_string($arr)
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{
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  ob_start();
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  var_export($arr);
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  $r = ob_get_contents();
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  ob_end_clean();
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  return $r;
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}
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function session_commit_db()
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{
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  global $session_data;
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  $d = var_export_string($session_data);
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  $fp = @fopen('./session_db.php', 'w');
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  if ( !$fp )
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  {
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    warning('Could not open the session database for writing. Logins may not work.');
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    return false;
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  }
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  $d = <<<EOF
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<?php
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// Automatically generated session database for Greyhound. Do not edit this file!
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\$GLOBALS['session_data'] = $d;
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EOF;
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  fwrite($fp, $d);
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  fclose($fp);
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  return true;
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}
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function load_session_data()
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{
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  if ( file_exists('./session_db.php') )
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  {
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    require('./session_db.php');
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  }
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  else
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  {
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    $GLOBALS['session_data'] = array();
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  }
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}
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$session_data = array();
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?>