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<?php
/***************************************************************************
 *                                sessions.php
 *                            -------------------
 *   begin                : Saturday, Feb 13, 2001
 *   copyright            : (C) 2001 The phpBB Group
 *   email                : support@phpbb.com
 *
 *   $Id: sessions.php,v 1.58.2.14 2005/05/06 20:50:11 acydburn Exp $
 *
 *
 ***************************************************************************/

/***************************************************************************
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 ***************************************************************************/

//
// Adds/updates a new session to the database for the given userid.
// Returns the new session ID on success.
//
function session_begin($user_id, $user_ip, $page_id, $auto_create = 0, $enable_autologin = 0, $admin = 0)
{
 global $db, $board_config;
 global $HTTP_COOKIE_VARS, $HTTP_GET_VARS, $SID;

 $cookiename = $board_config['cookie_name'];
 $cookiepath = $board_config['cookie_path'];
 $cookiedomain = $board_config['cookie_domain'];
 $cookiesecure = $board_config['cookie_secure'];

 if ( isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) || isset($HTTP_COOKIE_VARS[$cookiename . '_data']) )
 {
  $session_id = isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) ? $HTTP_COOKIE_VARS[$cookiename . '_sid'] : '';
  $sessiondata = isset($HTTP_COOKIE_VARS[$cookiename . '_data']) ? unserialize(stripslashes($HTTP_COOKIE_VARS[$cookiename . '_data'])) : array();
  $sessionmethod = SESSION_METHOD_COOKIE;
 }
 else
 {
  $sessiondata = array();
  $session_id = ( isset($HTTP_GET_VARS['sid']) ) ? $HTTP_GET_VARS['sid'] : '';
  $sessionmethod = SESSION_METHOD_GET;
 }

 //
 if (!preg_match('/^[A-Za-z0-9]*$/', $session_id)) 
 {
  $session_id = '';
 }

 $page_id = (int) $page_id;

 $last_visit = 0;
 $current_time = time();
 $expiry_time = $current_time - $board_config['session_length'];

 //
 // Try and pull the last time stored in a cookie, if it exists
 //
 $sql = "SELECT * 
  FROM " . USERS_TABLE . " 
  WHERE user_id = $user_id";
 if ( !($result = $db->sql_query($sql)) )
 {
  message_die(CRITICAL_ERROR, 'Could not obtain lastvisit data from user table', '', __LINE__, __FILE__, $sql);
 }

 $userdata = $db->sql_fetchrow($result);

 if ( $user_id != ANONYMOUS )
 {
  $auto_login_key = $userdata['user_password'];

  if ( $auto_create )
  {
   if ( isset($sessiondata['autologinid']) && $userdata['user_active'] )
   {
    // We have to login automagically
    if( $sessiondata['autologinid'] === $auto_login_key )
    {
     // autologinid matches password
     $login = 1;
     $enable_autologin = 1;
    }
    else
    {
     // No match; don't login, set as anonymous user
     $login = 0; 
     $enable_autologin = 0; 
     $user_id = $userdata['user_id'] = ANONYMOUS;
    
     $sql = 'SELECT * FROM ' . USERS_TABLE . ' WHERE user_id = ' . ANONYMOUS;
     $result = $db->sql_query($sql);
     $userdata = $db->sql_fetchrow($result);
     $db->sql_freeresult($result);
    }
   }
   else
   {
    // Autologin is not set. Don't login, set as anonymous user
    $login = 0;
    $enable_autologin = 0;
    $user_id = $userdata['user_id'] = ANONYMOUS;

    $sql = 'SELECT * FROM ' . USERS_TABLE . ' WHERE user_id = ' . ANONYMOUS;
    $result = $db->sql_query($sql);
    $userdata = $db->sql_fetchrow($result);
    $db->sql_freeresult($result);
   }
  }
  else
  {
   $login = 1;
  }
 }
 else
 {
  $login = 0;
  $enable_autologin = 0;
 }

 //
 // Initial ban check against user id, IP and email address
 //
 preg_match('/(..)(..)(..)(..)/', $user_ip, $user_ip_parts);

 $sql = "SELECT ban_ip, ban_userid, ban_email 
  FROM " . BANLIST_TABLE . " 
  WHERE ban_ip IN ('" . $user_ip_parts[1] . $user_ip_parts[2] . $user_ip_parts[3] . $user_ip_parts[4] . "', '" . $user_ip_parts[1] . $user_ip_parts[2] . $user_ip_parts[3] . "ff', '" . $user_ip_parts[1] . $user_ip_parts[2] . "ffff', '" . $user_ip_parts[1] . "ffffff')
   OR ban_userid = $user_id";
 if ( $user_id != ANONYMOUS )
 {
  $sql .= " OR ban_email LIKE '" . str_replace("\'", "''", $userdata['user_email']) . "' 
   OR ban_email LIKE '" . substr(str_replace("\'", "''", $userdata['user_email']), strpos(str_replace("\'", "''", $userdata['user_email']), "@")) . "'";
 }
 if ( !($result = $db->sql_query($sql)) )
 {
  message_die(CRITICAL_ERROR, 'Could not obtain ban information', '', __LINE__, __FILE__, $sql);
 }

 if ( $ban_info = $db->sql_fetchrow($result) )
 {
  if ( $ban_info['ban_ip'] || $ban_info['ban_userid'] || $ban_info['ban_email'] )
  {
   message_die(CRITICAL_MESSAGE, 'You_been_banned');
  }
 }

 //
 // Create or update the session
 //
 $sql = "UPDATE " . SESSIONS_TABLE . "
  SET session_user_id = $user_id, session_start = $current_time, session_time = $current_time, session_page = $page_id, session_logged_in = $login, session_admin = $admin
  WHERE session_id = '" . $session_id . "' 
   AND session_ip = '$user_ip'";
 if ( !$db->sql_query($sql) || !$db->sql_affectedrows() )
 {
  list($sec, $usec) = explode(' ', microtime());
  mt_srand((float) $sec + ((float) $usec * 100000));
  $session_id = md5(uniqid(mt_rand(), true));

  $sql = "INSERT INTO " . SESSIONS_TABLE . "
   (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin)
   VALUES ('$session_id', $user_id, $current_time, $current_time, '$user_ip', $page_id, $login, $admin)";
  if ( !$db->sql_query($sql) )
  {
   message_die(CRITICAL_ERROR, 'Error creating new session', '', __LINE__, __FILE__, $sql);
  }
 }

 if ( $user_id != ANONYMOUS )
 {// ( $userdata['user_session_time'] > $expiry_time && $auto_create ) ? $userdata['user_lastvisit'] : ( 
  $last_visit = ( $userdata['user_session_time'] > 0 ) ? $userdata['user_session_time'] : $current_time; 

  if (!$admin)
  {
   $sql = "UPDATE " . USERS_TABLE . " 
    SET user_session_time = $current_time, user_session_page = $page_id, user_lastvisit = $last_visit
    WHERE user_id = $user_id";
   if ( !$db->sql_query($sql) )
   {
    message_die(CRITICAL_ERROR, 'Error updating last visit time', '', __LINE__, __FILE__, $sql);
   }
  }

  $userdata['user_lastvisit'] = $last_visit;

  $sessiondata['autologinid'] = (!$admin) ? (( $enable_autologin && $sessionmethod == SESSION_METHOD_COOKIE ) ? $auto_login_key : '') : $sessiondata['autologinid'];
  $sessiondata['userid'] = $user_id;
 }

 $userdata['session_id'] = $session_id;
 $userdata['session_ip'] = $user_ip;
 $userdata['session_user_id'] = $user_id;
 $userdata['session_logged_in'] = $login;
 $userdata['session_page'] = $page_id;
 $userdata['session_start'] = $current_time;
 $userdata['session_time'] = $current_time;
 $userdata['session_admin'] = $admin;

 setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure);
 setcookie($cookiename . '_sid', $session_id, 0, $cookiepath, $cookiedomain, $cookiesecure);

 $SID = 'sid=' . $session_id;

 return $userdata;
}

//
// Checks for a given user session, tidies session table and updates user
// sessions at each page refresh
//
function session_pagestart($user_ip, $thispage_id)
{
 global $db, $lang, $board_config;
 global $HTTP_COOKIE_VARS, $HTTP_GET_VARS, $SID;

 $cookiename = $board_config['cookie_name'];
 $cookiepath = $board_config['cookie_path'];
 $cookiedomain = $board_config['cookie_domain'];
 $cookiesecure = $board_config['cookie_secure'];

 $current_time = time();
 unset($userdata);

 if ( isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) || isset($HTTP_COOKIE_VARS[$cookiename . '_data']) )
 {
  $sessiondata = isset( $HTTP_COOKIE_VARS[$cookiename . '_data'] ) ? unserialize(stripslashes($HTTP_COOKIE_VARS[$cookiename . '_data'])) : array();
  $session_id = isset( $HTTP_COOKIE_VARS[$cookiename . '_sid'] ) ? $HTTP_COOKIE_VARS[$cookiename . '_sid'] : '';
  $sessionmethod = SESSION_METHOD_COOKIE;
 }
 else
 {
  $sessiondata = array();
  $session_id = ( isset($HTTP_GET_VARS['sid']) ) ? $HTTP_GET_VARS['sid'] : '';
  $sessionmethod = SESSION_METHOD_GET;
 }

 // 
 if (!preg_match('/^[A-Za-z0-9]*$/', $session_id))
 {
  $session_id = '';
 }

 $thispage_id = (int) $thispage_id;

 //
 // Does a session exist?
 //
 if ( !empty($session_id) )
 {
  //
  // session_id exists so go ahead and attempt to grab all
  // data in preparation
  //
  $sql = "SELECT u.*, s.*
   FROM " . SESSIONS_TABLE . " s, " . USERS_TABLE . " u
   WHERE s.session_id = '$session_id'
    AND u.user_id = s.session_user_id";
  if ( !($result = $db->sql_query($sql)) )
  {
   message_die(CRITICAL_ERROR, 'Error doing DB query userdata row fetch', '', __LINE__, __FILE__, $sql);
  }

  $userdata = $db->sql_fetchrow($result);

  //
  // Did the session exist in the DB?
  //
  if ( isset($userdata['user_id']) )
  {
   //
   // Do not check IP assuming equivalence, if IPv4 we'll check only first 24
   // bits ... I've been told (by vHiker) this should alleviate problems with 
   // load balanced et al proxies while retaining some reliance on IP security.
   //
   $ip_check_s = substr($userdata['session_ip'], 0, 6);
   $ip_check_u = substr($user_ip, 0, 6);

   if ($ip_check_s == $ip_check_u)
   {
    $SID = ($sessionmethod == SESSION_METHOD_GET || defined('IN_ADMIN')) ? 'sid=' . $session_id : '';

    //
    // Only update session DB a minute or so after last update
    //
    if ( $current_time - $userdata['session_time'] > 60 )
    {
     // A little trick to reset session_admin on session re-usage
     $update_admin = (!defined('IN_ADMIN') && $current_time - $userdata['session_time'] > ($board_config['session_length']+60)) ? ', session_admin = 0' : '';

     $sql = "UPDATE " . SESSIONS_TABLE . " 
      SET session_time = $current_time, session_page = $thispage_id$update_admin
      WHERE session_id = '" . $userdata['session_id'] . "'";
     if ( !$db->sql_query($sql) )
     {
      message_die(CRITICAL_ERROR, 'Error updating sessions table', '', __LINE__, __FILE__, $sql);
     }

     if ( $userdata['user_id'] != ANONYMOUS )
     {
      $sql = "UPDATE " . USERS_TABLE . " 
       SET user_session_time = $current_time, user_session_page = $thispage_id
       WHERE user_id = " . $userdata['user_id'];
      if ( !$db->sql_query($sql) )
      {
       message_die(CRITICAL_ERROR, 'Error updating sessions table', '', __LINE__, __FILE__, $sql);
      }
     }

     //
     // Delete expired sessions
     //
     $expiry_time = $current_time - $board_config['session_length'];

     $sql = "DELETE FROM " . SESSIONS_TABLE . " 
      WHERE session_time < $expiry_time 
       AND session_id <> '$session_id'";
     if ( !$db->sql_query($sql) )
     {
      message_die(CRITICAL_ERROR, 'Error clearing sessions table', '', __LINE__, __FILE__, $sql);
     }

     setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure);
     setcookie($cookiename . '_sid', $session_id, 0, $cookiepath, $cookiedomain, $cookiesecure);
    }

    return $userdata;
   }
  }
 }

 //
 // If we reach here then no (valid) session exists. So we'll create a new one,
 // using the cookie user_id if available to pull basic user prefs.
 //
 $user_id = ( isset($sessiondata['userid']) ) ? intval($sessiondata['userid']) : ANONYMOUS;

 if ( !($userdata = session_begin($user_id, $user_ip, $thispage_id, TRUE)) )
 {
  message_die(CRITICAL_ERROR, 'Error creating user session', '', __LINE__, __FILE__, $sql);
 }

 return $userdata;

}

//
// session_end closes out a session
// deleting the corresponding entry
// in the sessions table
//
function session_end($session_id, $user_id)
{
 global $db, $lang, $board_config;
 global $HTTP_COOKIE_VARS, $HTTP_GET_VARS, $SID;

 $cookiename = $board_config['cookie_name'];
 $cookiepath = $board_config['cookie_path'];
 $cookiedomain = $board_config['cookie_domain'];
 $cookiesecure = $board_config['cookie_secure'];

 $current_time = time();

 //
 // Pull cookiedata or grab the URI propagated sid
 //
 if ( isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) )
 {
  $session_id = isset( $HTTP_COOKIE_VARS[$cookiename . '_sid'] ) ? $HTTP_COOKIE_VARS[$cookiename . '_sid'] : '';
  $sessionmethod = SESSION_METHOD_COOKIE;
 }
 else
 {
  $session_id = ( isset($HTTP_GET_VARS['sid']) ) ? $HTTP_GET_VARS['sid'] : '';
  $sessionmethod = SESSION_METHOD_GET;
 }

 if (!preg_match('/^[A-Za-z0-9]*$/', $session_id))
 {
  return;
 }
 
 //
 // Delete existing session
 //
 $sql = "DELETE FROM " . SESSIONS_TABLE . " 
  WHERE session_id = '$session_id' 
   AND session_user_id = $user_id";
 if ( !$db->sql_query($sql) )
 {
  message_die(CRITICAL_ERROR, 'Error removing user session', '', __LINE__, __FILE__, $sql);
 }

 setcookie($cookiename . '_data', '', $current_time - 31536000, $cookiepath, $cookiedomain, $cookiesecure);
 setcookie($cookiename . '_sid', '', $current_time - 31536000, $cookiepath, $cookiedomain, $cookiesecure);

 return true;
}

//
// Append $SID to a url. Borrowed from phplib and modified. This is an
// extra routine utilised by the session code above and acts as a wrapper
// around every single URL and form action. If you replace the session
// code you must include this routine, even if it's empty.
//
function append_sid($url, $non_html_amp = false)
{
 global $SID;

 if ( !empty($SID) && !preg_match('#sid=#', $url) )
 {
  $url .= ( ( strpos($url, '?') != false ) ?  ( ( $non_html_amp ) ? '&' : '&' ) : '?' ) . $SID;
 }

 return $url;
}

?>