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php-phpbb/phpBB/includes/session.php
Paul S. Owen 74ac4985db Change LIMIT query to use DBAL method 
git-svn-id: file:///svn/phpbb/trunk@3351 89ea8834-ac86-4346-8a33-228a782c2dd0
2003-01-22 15:06:23 +00:00

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<?php
/***************************************************************************
* session.php
* -------------------
* begin : Saturday, Feb 13, 2001
* copyright : (C) 2002 The phpBB Group
* email : support@phpbb.com
*
* $Id$
*
***************************************************************************/
/***************************************************************************
*
* 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.
*
***************************************************************************/
class session
{
var $session_id = '';
var $data = array();
var $browser = '';
var $ip = '';
var $page = '';
var $load;
// Called at each page start ... checks for, updates and/or creates a session
function start($update = true)
{
global $SID, $db, $config;
$current_time = time();
$this->browser = (!empty($_SERVER['HTTP_USER_AGENT'])) ? $_SERVER['HTTP_USER_AGENT'] : $_ENV['HTTP_USER_AGENT'];
$this->page = (!empty($_SERVER['PHP_SELF'])) ? $_SERVER['PHP_SELF'] : $_ENV['PHP_SELF'];
$this->page .= '&' . ((!empty($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : $_ENV['QUERY_STRING']);
if (isset($_COOKIE[$config['cookie_name'] . '_sid']) || isset($_COOKIE[$config['cookie_name'] . '_data']))
{
$sessiondata = (isset($_COOKIE[$config['cookie_name'] . '_data'])) ? unserialize(stripslashes($_COOKIE[$config['cookie_name'] . '_data'])) : '';
$this->session_id = (isset($_COOKIE[$config['cookie_name'] . '_sid'])) ? $_COOKIE[$config['cookie_name'] . '_sid'] : '';
$SID = (defined('NEED_SID')) ? '?sid=' . $this->session_id : '?sid=';
}
else
{
$sessiondata = '';
$this->session_id = (isset($_GET['sid'])) ? $_GET['sid'] : '';
$SID = '?sid=' . $this->session_id;
}
// Obtain users IP
$this->ip = (!empty($_SERVER['REMOTE_ADDR'])) ? $_SERVER['REMOTE_ADDR'] : $REMOTE_ADDR;
if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
{
if (preg_match('#^([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)#', $_SERVER['HTTP_X_FORWARDED_FOR'], $ip_list))
{
$private_ip = array('#^0\.#', '#^127\.0\.0\.1#', '#^192\.168\.#', '#^172\.16\.#', '#^10\.#', '#^224\.#', '#^240\.#');
$this->ip = preg_replace($private_ip, $this->ip, $ip_list[1]);
}
}
// Load limit check (if applicable)
if (doubleval($config['limit_load']) && file_exists('/proc/loadavg'))
{
if ($load = @file('/proc/loadavg'))
{
list($this->load) = explode(' ', $load[0]);
if ($this->load > doubleval($config['limit_load']))
{
trigger_error('Board_unavailable');
}
}
}
// session_id exists so go ahead and attempt to grab all data in preparation
// Added session check
if (!empty($this->session_id) && (!defined('NEED_SID') || $this->session_id == $_GET['sid']))
{
$sql = "SELECT u.*, s.*
FROM " . SESSIONS_TABLE . " s, " . USERS_TABLE . " u
WHERE s.session_id = '" . $this->session_id . "'
AND u.user_id = s.session_user_id";
$result = $db->sql_query($sql);
$this->data = $db->sql_fetchrow($result);
$db->sql_freeresult($result);
// Did the session exist in the DB?
if (isset($this->data['user_id']))
{
// Validate IP length according to admin ... has no effect on IPv6
$s_ip = implode('.', array_slice(explode('.', $this->data['session_ip']), 0, $config['ip_check']));
$u_ip = implode('.', array_slice(explode('.', $this->ip), 0, $config['ip_check']));
if ($u_ip == $s_ip)
{
// Only update session DB a minute or so after last update or if page changes
if (($current_time - $this->data['session_time'] > 60 || $this->data['session_page'] != $this->page) && $update)
{
$sql = "UPDATE " . SESSIONS_TABLE . "
SET session_time = $current_time, session_page = '$this->page'
WHERE session_id = '" . $this->session_id . "'";
$db->sql_query($sql);
}
return true;
}
}
}
// Session check failed, redirect the user to the index page
// TODO: we could delay it until we grab user's data and display a localised error message
if (defined('NEED_SID'))
{
// NOTE: disabled until we decide how to deal with this
//redirect("index.$phpEx$SID");
}
// 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.
$autologin = (isset($sessiondata['autologinid'])) ? $sessiondata['autologinid'] : '';
$user_id = (isset($sessiondata['userid'])) ? intval($sessiondata['userid']) : ANONYMOUS;
return $this->create($user_id, $autologin);
}
// Create a new session
function create(&$user_id, &$autologin, $set_autologin = false)
{
global $SID, $db, $config;
$sessiondata = array();
$current_time = time();
if (intval($config['active_sessions']))
{
// Limit sessions in 1 minute period
$sql = "SELECT COUNT(*) AS sessions
FROM " . SESSIONS_TABLE . "
WHERE session_time >= " . ($current_time - 60);
$result = $db->sql_query($sql);
$row = $db->sql_fetchrow($result);
$db->sql_freeresult($result);
if (intval($row['sessions']) > intval($config['active_sessions']))
{
trigger_error('Board_unavailable');
}
}
// Garbage collection ... remove old sessions updating user information
// if necessary. It means (potentially) 11 queries but only infrequently
if ($current_time - $config['session_gc'] > $config['session_last_gc'])
{
$this->gc($current_time);
}
// Grab user data ... join on session if it exists for session time
$sql = "SELECT u.*, s.session_time
FROM (" . USERS_TABLE . " u
LEFT JOIN " . SESSIONS_TABLE . " s ON s.session_user_id = u.user_id)
WHERE u.user_id = $user_id
ORDER BY s.session_time DESC";
$result = $db->sql_query($sql);
$this->data = $db->sql_fetchrow($result);
$db->sql_freeresult($result);
// Check autologin request, is it valid?
if (empty($this->data) || ($this->data['user_password'] != $autologin && !$set_autologin) || !$this->data['user_active'])
{
$autologin = '';
$this->data['user_id'] = $user_id = ANONYMOUS;
}
// Is user banned? Are they excluded?
if (!$this->data['user_founder'])
{
$banned = false;
$sql = "SELECT ban_ip, ban_userid, ban_email, ban_exclude
FROM " . BANLIST_TABLE . "
WHERE ban_end >= $current_time
OR ban_end = 0";
$result = $db->sql_query($sql);
if ($row = $db->sql_fetchrow($result))
{
do
{
if ((intval($row['ban_userid']) == $this->data['user_id']) ||
(!empty($row['ban_ip']) && preg_match('#^' . str_replace('*', '.*?', $row['ban_ip']) . '$#i', $this->ip)) ||
(!empty($row['ban_email']) && preg_match('#^' . str_replace('*', '.*?', $row['ban_email']) . '$#i', $this->data['user_email'])))
{
if (!empty($row['ban_exclude']))
{
$banned = false;
break;
}
else
{
$banned = true;
}
}
}
while ($row = $db->sql_fetchrow($result));
}
$db->sql_freeresult($result);
if ($banned)
{
trigger_error('You_been_banned');
}
}
// Is there an existing session? If so, grab last visit time from that
$this->data['session_last_visit'] = ($this->data['session_time']) ? $this->data['session_time'] : (($this->data['user_lastvisit']) ? $this->data['user_lastvisit'] : time());
// Create or update the session
$db->sql_return_on_error(true);
$sql = "UPDATE " . SESSIONS_TABLE . "
SET session_user_id = $user_id, session_last_visit = " . $this->data['session_last_visit'] . ", session_start = $current_time, session_time = $current_time, session_browser = '$this->browser', session_page = '$this->page'
WHERE session_id = '" . $this->session_id . "'";
if (!$db->sql_query($sql) || !$db->sql_affectedrows())
{
$db->sql_return_on_error(false);
$this->session_id = md5(uniqid($user_ip));
$sql = "INSERT INTO " . SESSIONS_TABLE . "
(session_id, session_user_id, session_last_visit, session_start, session_time, session_ip, session_browser, session_page)
VALUES ('" . $this->session_id . "', $user_id, " . $this->data['session_last_visit'] . ", $current_time, $current_time, '$this->ip', '$this->browser', '$this->page')";
$db->sql_query($sql);
}
$db->sql_return_on_error(false);
$this->data['session_id'] = $this->session_id;
$sessiondata['autologinid'] = ($autologin && $user_id != ANONYMOUS) ? $autologin : '';
$sessiondata['userid'] = $user_id;
$this->set_cookie('data', serialize($sessiondata), $current_time + 31536000);
$this->set_cookie('sid', $this->session_id, 0);
$SID = '?sid=' . $this->session_id;
if ($this->data['user_id'] != ANONYMOUS)
{
// Events ... ?
// do_events('days');
// First page ... ?
// if (!empty($this->data['user_firstpage']))
// {
// redirect($userdata['user_firstpage']);
// }
}
return true;
}
// Destroy a session
function destroy()
{
global $SID, $db, $config;
$current_time = time();
$this->set_cookie('data', '', $current_time - 31536000);
$this->set_cookie('sid', '', $current_time - 31536000);
$SID = '?sid=';
// Delete existing session, update last visit info first!
$sql = "UPDATE " . USERS_TABLE . "
SET user_lastvisit = " . intval($this->data['session_time']) . "
WHERE user_id = " . $this->data['user_id'];
$db->sql_query($sql);
$sql = "DELETE FROM " . SESSIONS_TABLE . "
WHERE session_id = '" . $this->session_id . "'
AND session_user_id = " . $this->data['user_id'];
$db->sql_query($sql);
$this->session_id = '';
return true;
}
// Garbage collection
function gc(&$current_time)
{
global $db, $config;
// Get expired sessions, only most recent for each user
$sql = "SELECT session_user_id, MAX(session_time) AS recent_time
FROM " . SESSIONS_TABLE . "
WHERE session_time < " . ($current_time - $config['session_length']) . "
GROUP BY session_user_id";
$result = $db->sql_query_limit($sql, 5);
$del_user_id = '';
$del_sessions = 0;
if ($row = $db->sql_fetchrow($result))
{
do
{
if (intval($row['session_user_id']) != ANONYMOUS)
{
$sql = "UPDATE " . USERS_TABLE . "
SET user_lastvisit = " . $row['recent_time'] . "
WHERE user_id = " . $row['session_user_id'];
$db->sql_query($sql);
}
$del_user_id .= (($del_user_id != '') ? ', ' : '') . " '" . $row['session_user_id'] . "'";
$del_sessions++;
}
while ($row = $db->sql_fetchrow($result));
}
if ($del_user_id != '')
{
// Delete expired sessions
$sql = "DELETE FROM " . SESSIONS_TABLE . "
WHERE session_user_id IN ($del_user_id)
AND session_time < " . ($current_time - $config['session_length']);
$db->sql_query($sql);
}
if ($del_sessions < 5)
{
// Less than 5 sessions, update gc timer ... else we want gc
// called again to delete other sessions
set_config('session_last_gc', $current_time);
}
return;
}
// Set a cookie
function set_cookie($name, $cookiedata, $cookietime)
{
global $config;
setcookie($config['cookie_name'] . '_' . $name, $cookiedata, $cookietime, $config['cookie_path'], $config['cookie_domain'], $config['cookie_secure']);
}
}
// Contains (at present) basic user methods such as configuration
// creating date/time ... keep this?
class user extends session
{
var $lang = array();
var $theme = array();
var $date_format;
var $timezone;
var $dst;
var $lang_name;
var $lang_path;
var $img_lang;
function setup($lang_set = false, $style = false)
{
global $db, $template, $config, $phpEx, $phpbb_root_path;
if ($this->data['user_id'] != ANONYMOUS)
{
$this->lang_name = (file_exists($phpbb_root_path . 'language/' . $this->data['user_lang'])) ? $this->data['user_lang'] : $config['default_lang'];
$this->lang_path = $phpbb_root_path . 'language/' . $this->lang_name . '/';
$this->date_format = $this->data['user_dateformat'];
$this->timezone = $this->data['user_timezone'] * 3600;
$this->dst = $this->data['user_dst'] * 3600;
}
else
{
$this->lang_name = $config['default_lang'];
$this->lang_path = $phpbb_root_path . 'language/' . $this->lang_name . '/';
$this->date_format = $config['default_dateformat'];
$this->timezone = $config['board_timezone'] * 3600;
$this->dst = 0;
if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE']))
{
$accept_lang_ary = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']);
foreach ($accept_lang_ary as $accept_lang)
{
// Set correct format ... guess full xx_YY form
$accept_lang = substr($accept_lang, 0, 2) . '_' . strtoupper(substr($accept_lang, 3, 2));
if (file_exists($phpbb_root_path . 'language/' . $accept_lang))
{
$this->lang_name = $accept_lang;
$this->lang_path = $phpbb_root_path . 'language/' . $accept_lang . '/';
break;
}
else
{
// No match on xx_YY so try xx
$accept_lang = substr($accept_lang, 0, 2);
if (file_exists($phpbb_root_path . 'language/' . $accept_lang))
{
$this->lang_name = $accept_lang;
$this->lang_path = $phpbb_root_path . 'language/' . $accept_lang . '/';
break;
}
}
}
}
}
include($this->lang_path . 'lang_main.' . $phpEx);
if (defined('IN_ADMIN'))
{
include($this->lang_path . 'lang_admin.' . $phpEx);
}
$this->lang = &$lang;
/*
if (is_array($lang_set))
{
include($this->lang_path . '/common.' . $phpEx);
$lang_set = explode(',', $lang_set);
foreach ($lang_set as $lang_file)
{
include($this->lang_path . '/' . $lang_file . '.' . $phpEx);
}
unset($lang_set);
}
else
{
include($this->lang_path . '/common.' . $phpEx);
include($this->lang_path . '/' . $lang_set . '.' . $phpEx);
}
*/
// Set up style
$style = ($style) ? $style : ((!$config['override_user_style'] && $this->data['user_id'] != ANONYMOUS) ? $this->data['user_style'] : $config['default_style']);
$sql = "SELECT t.template_path, t.poll_length, t.pm_box_length, c.css_data, c.css_external, i.*
FROM " . STYLES_TABLE . " s, " . STYLES_TPL_TABLE . " t, " . STYLES_CSS_TABLE . " c, " . STYLES_IMAGE_TABLE . " i
WHERE s.style_id = $style
AND t.template_id = s.template_id
AND c.theme_id = s.style_id
AND i.imageset_id = s.imageset_id";
$result = $db->sql_query($sql);
if (!($this->theme = $db->sql_fetchrow($result)))
{
trigger_error('Could not get style data');
}
$template->set_template($this->theme['template_path']);
$this->img_lang = (file_exists($phpbb_root_path . 'imagesets/' . $this->theme['imageset_path'] . '/' . $this->lang_name)) ? $this->lang_name : $config['default_lang'];
return;
}
function format_date($gmepoch, $format = false)
{
static $lang_dates;
if (empty($lang_dates))
{
foreach ($this->lang['datetime'] as $match => $replace)
{
$lang_dates[$match] = $replace;
}
}
$format = (!$format) ? $this->date_format : $format;
return strtr(@gmdate($format, $gmepoch + $this->timezone + $this->dst), $lang_dates);
}
function img($img, $alt = '', $width = false, $no_cache = false)
{
static $imgs;
if (empty($imgs[$img]) || $no_cache)
{
$width = ($width) ? 'width="' . $width . '" ' : '';
$imgs[$img] = '<img src=' . str_replace('{LANG}', $this->img_lang, $this->theme[$img]) . '" ' . $width . 'alt="' . $this->lang[$alt] . '" title="' . $this->lang[$alt] . '" />';
}
return $imgs[$img];
}
}
// Will be keeping my eye of 'other products' to ensure these things don't
// mysteriously appear elsewhere, think up your own solutions!
class auth
{
var $founder = false;
var $acl = array();
var $acl_options = array();
function acl(&$userdata)
{
global $db, $acl_options;
$this->acl_options = &$acl_options;
if (!$this->founder = $userdata['user_founder'])
{
if (empty($userdata['user_permissions']))
{
$this->acl_cache($userdata);
}
$global_chars = ceil(sizeof($this->acl_options['global']) / 8);
$local_chars = ceil(sizeof($this->acl_options['local']) / 8) + 2;
$globals = substr($userdata['user_permissions'], 0, $global_chars);
$locals = substr($userdata['user_permissions'], $global_chars);
for($i = 0; $i < $global_chars; $i++)
{
$this->acl['global'] .= str_pad(decbin(ord(substr($globals, $i, 1))), 8, 0, STR_LEFT_PAD);
}
$forums = explode("\r\n", chunk_split($locals, $local_chars));
array_pop($forums);
foreach ($forums as $forum)
{
$forum_id = bindec(decbin(ord(substr($forum, 0, 1))) . str_pad(decbin(ord(substr($forum, 1, 1))), 8, 0, STR_PAD_LEFT));
for($i = 2; $i < $local_chars; $i++)
{
$this->acl['local'][$forum_id] .= str_pad(decbin(ord(substr($forum, $i, 1))), 8, 0, STR_PAD_LEFT);
}
}
unset($forums);
}
return;
}
// Look up an option
function acl_get($option, $forum_id = 0)
{
static $acl_cache;
if (!isset($acl_cache[$forum_id][$option]) && !$this->founder)
{
if (isset($this->acl_options['global'][$option]))
{
$acl_cache[$forum_id][$option] = substr($this->acl['global'], $this->acl_options['global'][$option], 1);
}
if (isset($this->acl_options['local'][$option]))
{
$acl_cache[$forum_id][$option] |= substr($this->acl['local'][$forum_id], $this->acl_options['local'][$option], 1);
}
}
return ($this->founder) ? true : $acl_cache[$forum_id][$option];
}
function acl_gets()
{
if ($this->founder)
{
return true;
}
$arguments = func_get_args();
$forum_id = array_pop($arguments);
if (!is_int($forum_id))
{
$arguments[] = $forum_id;
$forum_id = 0;
}
$acl = 0;
foreach ($arguments as $option)
{
$acl |= $this->acl_get($option, $forum_id);
}
return $acl;
}
// Cache data
function acl_cache(&$userdata)
{
global $db;
$acl_db = array();
$sql = "SELECT a.forum_id, a.auth_allow_deny, ao.auth_value
FROM " . ACL_GROUPS_TABLE . " a, " . ACL_OPTIONS_TABLE . " ao, " . USER_GROUP_TABLE . " ug
WHERE ug.user_id = " . $userdata['user_id'] . "
AND a.group_id = ug.group_id
AND ao.auth_option_id = a.auth_option_id";
$result = $db->sql_query($sql);
while ($row = $db->sql_fetchrow($result))
{
$acl_db[] = $row;
}
$db->sql_freeresult($result);
$sql = "SELECT a.forum_id, a.auth_allow_deny, ao.auth_option_id, ao.auth_value
FROM " . ACL_USERS_TABLE . " a, " . ACL_OPTIONS_TABLE . " ao
WHERE a.user_id = " . $userdata['user_id'] . "
AND ao.auth_option_id = a.auth_option_id";
$result = $db->sql_query($sql);
while ($row = $db->sql_fetchrow($result))
{
$acl_db[] = $row;
}
$db->sql_freeresult($result);
if (is_array($acl_db))
{
sort($acl_db);
foreach ($acl_db as $row)
{
if ($row['auth_allow_deny'] != ACL_INHERIT && $this->acl[$row['forum_id']][$row['auth_value']] !== ACL_DENY)
{
$this->acl[$row['forum_id']][$row['auth_value']] = intval($row['auth_allow_deny']);
}
}
unset($acl_db);
$global_bits = 8 * ceil(sizeof($this->acl_options['global']) / 8);
$local_bits = 8 * ceil(sizeof($this->acl_options['local']) / 8);
$local_hold = '';
$global_hold = '';
foreach ($this->acl as $forum_id => $auth_ary)
{
$holding = array();
$option_set = array();
if (!$forum_id)
{
$fill = $global_bits;
$ary_key = 'global';
$hold_str = 'global_hold';
}
else
{
$fill = $local_bits;
$ary_key = 'local';
$hold_str = 'local_hold';
}
for($i = 0; $i < $fill; $i++)
{
$holding[$i] = 0;
}
foreach ($auth_ary as $option => $allow)
{
if ($allow)
{
$holding[$this->acl_options[$ary_key][$option]] = 1;
$option_key = substr($option, 0, strpos($option, '_') + 1);
if (empty($holding[$this->acl_options[$ary_key][$option_key]]))
{
$holding[$this->acl_options[$ary_key][$option_key]] = 1;
}
}
}
$forum_id = ($forum_id) ? str_pad(decbin($forum_id), 16, 0, STR_PAD_LEFT) : '';
$bitstring = explode("\r\n", chunk_split($forum_id . implode('', $holding), 8));
array_pop($bitstring);
foreach ($bitstring as $byte)
{
$$hold_str .= chr(bindec($byte));
}
}
unset($holding);
if ($global_hold == '')
{
for($i = 0; $i < $global_bits / 8; $i++)
{
$global_hold .= chr(0);
}
}
$userdata['user_permissions'] .= $global_hold . $local_hold;
unset($global_hold);
unset($local_hold);
$sql = "UPDATE " . USERS_TABLE . "
SET user_permissions = '" . addslashes($userdata['user_permissions']) . "'
WHERE user_id = " . $userdata['user_id'];
$db->sql_query($sql);
}
return;
}
// Clear one or all users cached permission settings
function acl_clear_prefetch($user_id = false)
{
global $db;
$where_sql = ($user_id) ? "WHERE user_id = $user_id" : '';
$sql = "UPDATE " . USERS_TABLE . "
SET user_permissions = ''
$where_sql";
$db->sql_query($sql);
return;
}
// Authentication plug-ins is largely down to Sergey Kanareykin, our thanks to him.
function login($username, $password, $autologin = false)
{
global $config, $user, $phpEx;
$method = trim($config['auth_method']);
// NOTE: don't we need $phpbb_root_path here?
if (file_exists('includes/auth/auth_' . $method . '.' . $phpEx))
{
include_once('includes/auth/auth_' . $method . '.' . $phpEx);
$method = 'login_' . $method;
if (function_exists($method))
{
if (!($login = $method($username, $password)))
{
return false;
}
$autologin = (!empty($autologin)) ? md5($password) : '';
return ($login['user_active']) ? $user->create($login['user_id'], $autologin, true) : false;
}
}
trigger_error('Authentication method not found', E_USER_ERROR);
}
}
?>
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