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<?php
/**
*
* @package phpBB3
* @copyright (c) 2005 phpBB Group
* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
*
*/
/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
exit;
}
/**
* Session class
* @package phpBB3
*/
class phpbb_session
{
var $cookie_data = array();
var $page = array();
var $data = array();
var $browser = '';
var $forwarded_for = '';
var $host = '';
var $session_id = '';
var $ip = '';
var $load = 0;
var $time_now = 0;
var $update_session_page = true;
/**
* Extract current session page
*
* @param string $root_path current root path (phpbb_root_path)
*/
static function extract_current_page($root_path)
{
global $request;
$page_array = array();
// First of all, get the request uri...
$script_name = htmlspecialchars_decode($request->server('PHP_SELF'));
$args = explode('&', htmlspecialchars_decode($request->server('QUERY_STRING')));
// If we are unable to get the script name we use REQUEST_URI as a failover and note it within the page array for easier support...
if (!$script_name)
{
$script_name = htmlspecialchars_decode($request->server('REQUEST_URI'));
$script_name = (($pos = strpos($script_name, '?')) !== false) ? substr($script_name, 0, $pos) : $script_name;
$page_array['failover'] = 1;
}
// Replace backslashes and doubled slashes (could happen on some proxy setups)
$script_name = str_replace(array('\\', '//'), '/', $script_name);
// Now, remove the sid and let us get a clean query string...
$use_args = array();
// Since some browser do not encode correctly we need to do this with some "special" characters...
// " -> %22, ' => %27, < -> %3C, > -> %3E
$find = array('"', "'", '<', '>');
$replace = array('%22', '%27', '%3C', '%3E');
foreach ($args as $key => $argument)
{
if (strpos($argument, 'sid=') === 0)
{
continue;
}
$use_args[] = str_replace($find, $replace, $argument);
}
unset($args);
// The following examples given are for an request uri of {path to the phpbb directory}/adm/index.php?i=10&b=2
// The current query string
$query_string = trim(implode('&', $use_args));
// basenamed page name (for example: index.php)
$page_name = (substr($script_name, -1, 1) == '/') ? '' : basename($script_name);
$page_name = urlencode(htmlspecialchars($page_name));
// current directory within the phpBB root (for example: adm)
$root_dirs = explode('/', str_replace('\\', '/', phpbb_realpath($root_path)));
$page_dirs = explode('/', str_replace('\\', '/', phpbb_realpath('./')));
$intersection = array_intersect_assoc($root_dirs, $page_dirs);
$root_dirs = array_diff_assoc($root_dirs, $intersection);
$page_dirs = array_diff_assoc($page_dirs, $intersection);
$page_dir = str_repeat('../', sizeof($root_dirs)) . implode('/', $page_dirs);
if ($page_dir && substr($page_dir, -1, 1) == '/')
{
$page_dir = substr($page_dir, 0, -1);
}
// Current page from phpBB root (for example: adm/index.php?i=10&b=2)
$page = (($page_dir) ? $page_dir . '/' : '') . $page_name . (($query_string) ? "?$query_string" : '');
// The script path from the webroot to the current directory (for example: /phpBB3/adm/) : always prefixed with / and ends in /
$script_path = trim(str_replace('\\', '/', dirname($script_name)));
// The script path from the webroot to the phpBB root (for example: /phpBB3/)
$script_dirs = explode('/', $script_path);
array_splice($script_dirs, -sizeof($page_dirs));
$root_script_path = implode('/', $script_dirs) . (sizeof($root_dirs) ? '/' . implode('/', $root_dirs) : '');
// We are on the base level (phpBB root == webroot), lets adjust the variables a bit...
if (!$root_script_path)
{
$root_script_path = ($page_dir) ? str_replace($page_dir, '', $script_path) : $script_path;
}
$script_path .= (substr($script_path, -1, 1) == '/') ? '' : '/';
$root_script_path .= (substr($root_script_path, -1, 1) == '/') ? '' : '/';
$page_array += array(
'page_name' => $page_name,
'page_dir' => $page_dir,
'query_string' => $query_string,
'script_path' => str_replace(' ', '%20', htmlspecialchars($script_path)),
'root_script_path' => str_replace(' ', '%20', htmlspecialchars($root_script_path)),
'page' => $page,
'forum' => request_var('f', 0),
);
return $page_array;
}
/**
* Get valid hostname/port. HTTP_HOST is used, SERVER_NAME if HTTP_HOST not present.
*/
function extract_current_hostname()
{
global $config, $request;
// Get hostname
$host = htmlspecialchars_decode($request->header('Host', $request->server('SERVER_NAME')));
// Should be a string and lowered
$host = (string) strtolower($host);
// If host is equal the cookie domain or the server name (if config is set), then we assume it is valid
if ((isset($config['cookie_domain']) && $host === $config['cookie_domain']) || (isset($config['server_name']) && $host === $config['server_name']))
{
return $host;
}
// Is the host actually a IP? If so, we use the IP... (IPv4)
if (long2ip(ip2long($host)) === $host)
{
return $host;
}
// Now return the hostname (this also removes any port definition). The http:// is prepended to construct a valid URL, hosts never have a scheme assigned
$host = @parse_url('http://' . $host);
$host = (!empty($host['host'])) ? $host['host'] : '';
// Remove any portions not removed by parse_url (#)
$host = str_replace('#', '', $host);
// If, by any means, the host is now empty, we will use a "best approach" way to guess one
if (empty($host))
{
if (!empty($config['server_name']))
{
$host = $config['server_name'];
}
else if (!empty($config['cookie_domain']))
{
$host = (strpos($config['cookie_domain'], '.') === 0) ? substr($config['cookie_domain'], 1) : $config['cookie_domain'];
}
else
{
// Set to OS hostname or localhost
$host = (function_exists('php_uname')) ? php_uname('n') : 'localhost';
}
}
// It may be still no valid host, but for sure only a hostname (we may further expand on the cookie domain... if set)
return $host;
}
/**
* Start session management
*
* This is where all session activity begins. We gather various pieces of
* information from the client and server. We test to see if a session already
* exists. If it does, fine and dandy. If it doesn't we'll go on to create a
* new one ... pretty logical heh? We also examine the system load (if we're
* running on a system which makes such information readily available) and
* halt if it's above an admin definable limit.
*
* @param bool $update_session_page if true the session page gets updated.
* This can be set to circumvent certain scripts to update the users last visited page.
*/
function session_begin($update_session_page = true)
{
global $phpEx, $SID, $_SID, $_EXTRA_URL, $db, $config, $phpbb_root_path;
global $request;
// Give us some basic information
$this->time_now = time();
$this->cookie_data = array('u' => 0, 'k' => '');
$this->update_session_page = $update_session_page;
$this->browser = $request->header('User-Agent');
$this->referer = $request->header('Referer');
$this->forwarded_for = $request->header('X-Forwarded-For');
$this->host = $this->extract_current_hostname();
$this->page = $this->extract_current_page($phpbb_root_path);
// if the forwarded for header shall be checked we have to validate its contents
if ($config['forwarded_for_check'])
{
$this->forwarded_for = preg_replace('# {2,}#', ' ', str_replace(',', ' ', $this->forwarded_for));
// split the list of IPs
$ips = explode(' ', $this->forwarded_for);
foreach ($ips as $ip)
{
// check IPv4 first, the IPv6 is hopefully only going to be used very seldomly
if (!empty($ip) && !preg_match(get_preg_expression('ipv4'), $ip) && !preg_match(get_preg_expression('ipv6'), $ip))
{
// contains invalid data, don't use the forwarded for header
$this->forwarded_for = '';
break;
}
}
}
else
{
$this->forwarded_for = '';
}
if ($request->is_set($config['cookie_name'] . '_sid', phpbb_request_interface::COOKIE) || $request->is_set($config['cookie_name'] . '_u', phpbb_request_interface::COOKIE))
{
$this->cookie_data['u'] = request_var($config['cookie_name'] . '_u', 0, false, true);
$this->cookie_data['k'] = request_var($config['cookie_name'] . '_k', '', false, true);
$this->session_id = request_var($config['cookie_name'] . '_sid', '', false, true);
$SID = (defined('NEED_SID')) ? '?sid=' . $this->session_id : '?sid=';
$_SID = (defined('NEED_SID')) ? $this->session_id : '';
if (empty($this->session_id))
{
$this->session_id = $_SID = request_var('sid', '');
$SID = '?sid=' . $this->session_id;
$this->cookie_data = array('u' => 0, 'k' => '');
}
}
else
{
$this->session_id = $_SID = request_var('sid', '');
$SID = '?sid=' . $this->session_id;
}
$_EXTRA_URL = array();
// Why no forwarded_for et al? Well, too easily spoofed. With the results of my recent requests
// it's pretty clear that in the majority of cases you'll at least be left with a proxy/cache ip.
$this->ip = htmlspecialchars_decode($request->server('REMOTE_ADDR'));
$this->ip = preg_replace('# {2,}#', ' ', str_replace(',', ' ', $this->ip));
// split the list of IPs
$ips = explode(' ', trim($this->ip));
// Default IP if REMOTE_ADDR is invalid
$this->ip = '127.0.0.1';
foreach ($ips as $ip)
{
if (function_exists('phpbb_ip_normalise'))
{
// Normalise IP address
$ip = phpbb_ip_normalise($ip);
if (empty($ip))
{
// IP address is invalid.
break;
}
// IP address is valid.
$this->ip = $ip;
// Skip legacy code.
continue;
}
if (preg_match(get_preg_expression('ipv4'), $ip))
{
$this->ip = $ip;
}
else if (preg_match(get_preg_expression('ipv6'), $ip))
{
// Quick check for IPv4-mapped address in IPv6
if (stripos($ip, '::ffff:') === 0)
{
$ipv4 = substr($ip, 7);
if (preg_match(get_preg_expression('ipv4'), $ipv4))
{
$ip = $ipv4;
}
}
$this->ip = $ip;
}
else
{
// We want to use the last valid address in the chain
// Leave foreach loop when address is invalid
break;
}
}
$this->load = false;
// Load limit check (if applicable)
if ($config['limit_load'] || $config['limit_search_load'])
{
if ((function_exists('sys_getloadavg') && $load = sys_getloadavg()) || ($load = explode(' ', @file_get_contents('/proc/loadavg'))))
{
$this->load = array_slice($load, 0, 1);
$this->load = floatval($this->load[0]);
}
else
{
set_config('limit_load', '0');
set_config('limit_search_load', '0');
}
}
// if no session id is set, redirect to index.php
$session_id = $request->variable('sid', '');
if (defined('NEED_SID') && (empty($session_id) || $this->session_id !== $session_id))
{
send_status_line(401, 'Not authorized');
redirect(append_sid("{$phpbb_root_path}index.$phpEx"));
}
// if session id is set
if (!empty($this->session_id))
{
$sql = 'SELECT u.*, s.*
FROM ' . SESSIONS_TABLE . ' s, ' . USERS_TABLE . " u
WHERE s.session_id = '" . $db->sql_escape($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 ... enforces an IP
// check on bots if admin requires this
// $quadcheck = ($config['ip_check_bot'] && $this->data['user_type'] & USER_BOT) ? 4 : $config['ip_check'];
if (strpos($this->ip, ':') !== false && strpos($this->data['session_ip'], ':') !== false)
{
$s_ip = short_ipv6($this->data['session_ip'], $config['ip_check']);
$u_ip = short_ipv6($this->ip, $config['ip_check']);
}
else
{
$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']));
}
$s_browser = ($config['browser_check']) ? trim(strtolower(substr($this->data['session_browser'], 0, 149))) : '';
$u_browser = ($config['browser_check']) ? trim(strtolower(substr($this->browser, 0, 149))) : '';
$s_forwarded_for = ($config['forwarded_for_check']) ? substr($this->data['session_forwarded_for'], 0, 254) : '';
$u_forwarded_for = ($config['forwarded_for_check']) ? substr($this->forwarded_for, 0, 254) : '';
// referer checks
// The @ before $config['referer_validation'] suppresses notices present while running the updater
$check_referer_path = (@$config['referer_validation'] == REFERER_VALIDATE_PATH);
$referer_valid = true;
// we assume HEAD and TRACE to be foul play and thus only whitelist GET
if (@$config['referer_validation'] && strtolower($request->server('REQUEST_METHOD')) !== 'get')
{
$referer_valid = $this->validate_referer($check_referer_path);
}
if ($u_ip === $s_ip && $s_browser === $u_browser && $s_forwarded_for === $u_forwarded_for && $referer_valid)
{
$session_expired = false;
// Check whether the session is still valid if we have one
$method = basename(trim($config['auth_method']));
include_once($phpbb_root_path . 'includes/auth/auth_' . $method . '.' . $phpEx);
$method = 'validate_session_' . $method;
if (function_exists($method))
{
if (!$method($this->data))
{
$session_expired = true;
}
}
if (!$session_expired)
{
// Check the session length timeframe if autologin is not enabled.
// Else check the autologin length... and also removing those having autologin enabled but no longer allowed board-wide.
if (!$this->data['session_autologin'])
{
if ($this->data['session_time'] < $this->time_now - ($config['session_length'] + 60))
{
$session_expired = true;
}
}
else if (!$config['allow_autologin'] || ($config['max_autologin_time'] && $this->data['session_time'] < $this->time_now - (86400 * (int) $config['max_autologin_time']) + 60))
{
$session_expired = true;
}
}
if (!$session_expired)
{
// Only update session DB a minute or so after last update or if page changes
if ($this->time_now - $this->data['session_time'] > 60 || ($this->update_session_page && $this->data['session_page'] != $this->page['page']))
{
$sql_ary = array('session_time' => $this->time_now);
if ($this->update_session_page)
{
$sql_ary['session_page'] = substr($this->page['page'], 0, 199);
$sql_ary['session_forum_id'] = $this->page['forum'];
}
$db->sql_return_on_error(true);
$this->update_session($sql_ary);
$db->sql_return_on_error(false);
// If the database is not yet updated, there will be an error due to the session_forum_id
// @todo REMOVE for 3.0.2
if ($result === false)
{
unset($sql_ary['session_forum_id']);
$this->update_session($sql_ary);
}
if ($this->data['user_id'] != ANONYMOUS && !empty($config['new_member_post_limit']) && $this->data['user_new'] && $config['new_member_post_limit'] <= $this->data['user_posts'])
{
$this->leave_newly_registered();
}
}
$this->data['is_registered'] = ($this->data['user_id'] != ANONYMOUS && ($this->data['user_type'] == USER_NORMAL || $this->data['user_type'] == USER_FOUNDER)) ? true : false;
$this->data['is_bot'] = (!$this->data['is_registered'] && $this->data['user_id'] != ANONYMOUS) ? true : false;
$this->data['user_lang'] = basename($this->data['user_lang']);
return true;
}
}
else
{
// Added logging temporarly to help debug bugs...
if (defined('DEBUG_EXTRA') && $this->data['user_id'] != ANONYMOUS)
{
if ($referer_valid)
{
add_log('critical', 'LOG_IP_BROWSER_FORWARDED_CHECK', $u_ip, $s_ip, $u_browser, $s_browser, htmlspecialchars($u_forwarded_for), htmlspecialchars($s_forwarded_for));
}
else
{
add_log('critical', 'LOG_REFERER_INVALID', $this->referer);
}
}
}
}
}
// If we reach here then no (valid) session exists. So we'll create a new one
return $this->session_create();
}
/**
* Create a new session
*
* If upon trying to start a session we discover there is nothing existing we
* jump here. Additionally this method is called directly during login to regenerate
* the session for the specific user. In this method we carry out a number of tasks;
* garbage collection, (search)bot checking, banned user comparison. Basically
* though this method will result in a new session for a specific user.
*/
function session_create($user_id = false, $set_admin = false, $persist_login = false, $viewonline = true)
{
global $SID, $_SID, $db, $config, $cache, $phpbb_root_path, $phpEx;
$this->data = array();
/* Garbage collection ... remove old sessions updating user information
// if necessary. It means (potentially) 11 queries but only infrequently
if ($this->time_now > $config['session_last_gc'] + $config['session_gc'])
{
$this->session_gc();
}*/
// Do we allow autologin on this board? No? Then override anything
// that may be requested here
if (!$config['allow_autologin'])
{
$this->cookie_data['k'] = $persist_login = false;
}
/**
* Here we do a bot check, oh er saucy! No, not that kind of bot
* check. We loop through the list of bots defined by the admin and
* see if we have any useragent and/or IP matches. If we do, this is a
* bot, act accordingly
*/
$bot = false;
$active_bots = $cache->obtain_bots();
foreach ($active_bots as $row)
{
if ($row['bot_agent'] && preg_match('#' . str_replace('\*', '.*?', preg_quote($row['bot_agent'], '#')) . '#i', $this->browser))
{
$bot = $row['user_id'];
}
// If ip is supplied, we will make sure the ip is matching too...
if ($row['bot_ip'] && ($bot || !$row['bot_agent']))
{
// Set bot to false, then we only have to set it to true if it is matching
$bot = false;
foreach (explode(',', $row['bot_ip']) as $bot_ip)
{
$bot_ip = trim($bot_ip);
if (!$bot_ip)
{
continue;
}
if (strpos($this->ip, $bot_ip) === 0)
{
$bot = (int) $row['user_id'];
break;
}
}
}
if ($bot)
{
break;
}
}
$method = basename(trim($config['auth_method']));
include_once($phpbb_root_path . 'includes/auth/auth_' . $method . '.' . $phpEx);
$method = 'autologin_' . $method;
if (function_exists($method))
{
$this->data = $method();
if (sizeof($this->data))
{
$this->cookie_data['k'] = '';
$this->cookie_data['u'] = $this->data['user_id'];
}
}
// If we're presented with an autologin key we'll join against it.
// Else if we've been passed a user_id we'll grab data based on that
if (isset($this->cookie_data['k']) && $this->cookie_data['k'] && $this->cookie_data['u'] && !sizeof($this->data))
{
$sql = 'SELECT u.*
FROM ' . USERS_TABLE . ' u, ' . SESSIONS_KEYS_TABLE . ' k
WHERE u.user_id = ' . (int) $this->cookie_data['u'] . '
AND u.user_type IN (' . USER_NORMAL . ', ' . USER_FOUNDER . ")
AND k.user_id = u.user_id
AND k.key_id = '" . $db->sql_escape(md5($this->cookie_data['k'])) . "'";
$result = $db->sql_query($sql);
$this->data = $db->sql_fetchrow($result);
$db->sql_freeresult($result);
$bot = false;
}
else if ($user_id !== false && !sizeof($this->data))
{
$this->cookie_data['k'] = '';
$this->cookie_data['u'] = $user_id;
$sql = 'SELECT *
FROM ' . USERS_TABLE . '
WHERE user_id = ' . (int) $this->cookie_data['u'] . '
AND user_type IN (' . USER_NORMAL . ', ' . USER_FOUNDER . ')';
$result = $db->sql_query($sql);
$this->data = $db->sql_fetchrow($result);
$db->sql_freeresult($result);
$bot = false;
}
// Bot user, if they have a SID in the Request URI we need to get rid of it
// otherwise they'll index this page with the SID, duplicate content oh my!
if ($bot && isset($_GET['sid']))
{
send_status_line(301, 'Moved Permanently');
redirect(build_url(array('sid')));
}
// If no data was returned one or more of the following occurred:
// Key didn't match one in the DB
// User does not exist
// User is inactive
// User is bot
if (!sizeof($this->data) || !is_array($this->data))
{
$this->cookie_data['k'] = '';
$this->cookie_data['u'] = ($bot) ? $bot : ANONYMOUS;
if (!$bot)
{
$sql = 'SELECT *
FROM ' . USERS_TABLE . '
WHERE user_id = ' . (int) $this->cookie_data['u'];
}
else
{
// We give bots always the same session if it is not yet expired.
$sql = 'SELECT u.*, s.*
FROM ' . USERS_TABLE . ' u
LEFT JOIN ' . SESSIONS_TABLE . ' s ON (s.session_user_id = u.user_id)
WHERE u.user_id = ' . (int) $bot;
}
$result = $db->sql_query($sql);
$this->data = $db->sql_fetchrow($result);
$db->sql_freeresult($result);
}
if ($this->data['user_id'] != ANONYMOUS && !$bot)
{
$this->data['session_last_visit'] = (isset($this->data['session_time']) && $this->data['session_time']) ? $this->data['session_time'] : (($this->data['user_lastvisit']) ? $this->data['user_lastvisit'] : time());
}
else
{
$this->data['session_last_visit'] = $this->time_now;
}
// Force user id to be integer...
$this->data['user_id'] = (int) $this->data['user_id'];
// At this stage we should have a filled data array, defined cookie u and k data.
// data array should contain recent session info if we're a real user and a recent
// session exists in which case session_id will also be set
// Is user banned? Are they excluded? Won't return on ban, exists within method
if ($this->data['user_type'] != USER_FOUNDER)
{
if (!$config['forwarded_for_check'])
{
$this->check_ban($this->data['user_id'], $this->ip);
}
else
{
$ips = explode(' ', $this->forwarded_for);
$ips[] = $this->ip;
$this->check_ban($this->data['user_id'], $ips);
}
}
$this->data['is_registered'] = (!$bot && $this->data['user_id'] != ANONYMOUS && ($this->data['user_type'] == USER_NORMAL || $this->data['user_type'] == USER_FOUNDER)) ? true : false;
$this->data['is_bot'] = ($bot) ? true : false;
// If our friend is a bot, we re-assign a previously assigned session
if ($this->data['is_bot'] && $bot == $this->data['user_id'] && $this->data['session_id'])
{
// Only assign the current session if the ip, browser and forwarded_for match...
if (strpos($this->ip, ':') !== false && strpos($this->data['session_ip'], ':') !== false)
{
$s_ip = short_ipv6($this->data['session_ip'], $config['ip_check']);
$u_ip = short_ipv6($this->ip, $config['ip_check']);
}
else
{
$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']));
}
$s_browser = ($config['browser_check']) ? trim(strtolower(substr($this->data['session_browser'], 0, 149))) : '';
$u_browser = ($config['browser_check']) ? trim(strtolower(substr($this->browser, 0, 149))) : '';
$s_forwarded_for = ($config['forwarded_for_check']) ? substr($this->data['session_forwarded_for'], 0, 254) : '';
$u_forwarded_for = ($config['forwarded_for_check']) ? substr($this->forwarded_for, 0, 254) : '';
if ($u_ip === $s_ip && $s_browser === $u_browser && $s_forwarded_for === $u_forwarded_for)
{
$this->session_id = $this->data['session_id'];
// Only update session DB a minute or so after last update or if page changes
if ($this->time_now - $this->data['session_time'] > 60 || ($this->update_session_page && $this->data['session_page'] != $this->page['page']))
{
$this->data['session_time'] = $this->data['session_last_visit'] = $this->time_now;
$sql_ary = array('session_time' => $this->time_now, 'session_last_visit' => $this->time_now, 'session_admin' => 0);
if ($this->update_session_page)
{
$sql_ary['session_page'] = substr($this->page['page'], 0, 199);
$sql_ary['session_forum_id'] = $this->page['forum'];
}
$this->update_session($sql_ary);
// Update the last visit time
$sql = 'UPDATE ' . USERS_TABLE . '
SET user_lastvisit = ' . (int) $this->data['session_time'] . '
WHERE user_id = ' . (int) $this->data['user_id'];
$db->sql_query($sql);
}
$SID = '?sid=';
$_SID = '';
return true;
}
else
{
// If the ip and browser does not match make sure we only have one bot assigned to one session
$db->sql_query('DELETE FROM ' . SESSIONS_TABLE . ' WHERE session_user_id = ' . $this->data['user_id']);
}
}
$session_autologin = (($this->cookie_data['k'] || $persist_login) && $this->data['is_registered']) ? true : false;
$set_admin = ($set_admin && $this->data['is_registered']) ? true : false;
// Create or update the session
$sql_ary = array(
'session_user_id' => (int) $this->data['user_id'],
'session_start' => (int) $this->time_now,
'session_last_visit' => (int) $this->data['session_last_visit'],
'session_time' => (int) $this->time_now,
'session_browser' => (string) trim(substr($this->browser, 0, 149)),
'session_forwarded_for' => (string) $this->forwarded_for,
'session_ip' => (string) $this->ip,
'session_autologin' => ($session_autologin) ? 1 : 0,
'session_admin' => ($set_admin) ? 1 : 0,
'session_viewonline' => ($viewonline) ? 1 : 0,
);
if ($this->update_session_page)
{
$sql_ary['session_page'] = (string) substr($this->page['page'], 0, 199);
$sql_ary['session_forum_id'] = $this->page['forum'];
}
$db->sql_return_on_error(true);
$sql = 'DELETE
FROM ' . SESSIONS_TABLE . '
WHERE session_id = \'' . $db->sql_escape($this->session_id) . '\'
AND session_user_id = ' . ANONYMOUS;
if (!defined('IN_ERROR_HANDLER') && (!$this->session_id || !$db->sql_query($sql) || !$db->sql_affectedrows()))
{
// Limit new sessions in 1 minute period (if required)
if (empty($this->data['session_time']) && $config['active_sessions'])
{
// $db->sql_return_on_error(false);
$sql = 'SELECT COUNT(session_id) AS sessions
FROM ' . SESSIONS_TABLE . '
WHERE session_time >= ' . ($this->time_now - 60);
$result = $db->sql_query($sql);
$row = $db->sql_fetchrow($result);
$db->sql_freeresult($result);
if ((int) $row['sessions'] > (int) $config['active_sessions'])
{
send_status_line(503, 'Service Unavailable');
trigger_error('BOARD_UNAVAILABLE');
}
}
}
// Since we re-create the session id here, the inserted row must be unique. Therefore, we display potential errors.
// Commented out because it will not allow forums to update correctly
// $db->sql_return_on_error(false);
// Something quite important: session_page always holds the *last* page visited, except for the *first* visit.
// We are not able to simply have an empty session_page btw, therefore we need to tell phpBB how to detect this special case.
// If the session id is empty, we have a completely new one and will set an "identifier" here. This identifier is able to be checked later.
if (empty($this->data['session_id']))
{
// This is a temporary variable, only set for the very first visit
$this->data['session_created'] = true;
}
$this->session_id = $this->data['session_id'] = md5(unique_id());
$sql_ary['session_id'] = (string) $this->session_id;
$sql_ary['session_page'] = (string) substr($this->page['page'], 0, 199);
$sql_ary['session_forum_id'] = $this->page['forum'];
$sql = 'INSERT INTO ' . SESSIONS_TABLE . ' ' . $db->sql_build_array('INSERT', $sql_ary);
$db->sql_query($sql);
$db->sql_return_on_error(false);
// Regenerate autologin/persistent login key
if ($session_autologin)
{
$this->set_login_key();
}
// refresh data
$SID = '?sid=' . $this->session_id;
$_SID = $this->session_id;
$this->data = array_merge($this->data, $sql_ary);
if (!$bot)
{
$cookie_expire = $this->time_now + (($config['max_autologin_time']) ? 86400 * (int) $config['max_autologin_time'] : 31536000);
$this->set_cookie('u', $this->cookie_data['u'], $cookie_expire);
$this->set_cookie('k', $this->cookie_data['k'], $cookie_expire);
$this->set_cookie('sid', $this->session_id, $cookie_expire);
unset($cookie_expire);
$sql = 'SELECT COUNT(session_id) AS sessions
FROM ' . SESSIONS_TABLE . '
WHERE session_user_id = ' . (int) $this->data['user_id'] . '
AND session_time >= ' . (int) ($this->time_now - (max($config['session_length'], $config['form_token_lifetime'])));
$result = $db->sql_query($sql);
$row = $db->sql_fetchrow($result);
$db->sql_freeresult($result);
if ((int) $row['sessions'] <= 1 || empty($this->data['user_form_salt']))
{
$this->data['user_form_salt'] = unique_id();
// Update the form key
$sql = 'UPDATE ' . USERS_TABLE . '
SET user_form_salt = \'' . $db->sql_escape($this->data['user_form_salt']) . '\'
WHERE user_id = ' . (int) $this->data['user_id'];
$db->sql_query($sql);
}
}
else
{
$this->data['session_time'] = $this->data['session_last_visit'] = $this->time_now;
// Update the last visit time
$sql = 'UPDATE ' . USERS_TABLE . '
SET user_lastvisit = ' . (int) $this->data['session_time'] . '
WHERE user_id = ' . (int) $this->data['user_id'];
$db->sql_query($sql);
$SID = '?sid=';
$_SID = '';
}
return true;
}
/**
* Kills a session
*
* This method does what it says on the tin. It will delete a pre-existing session.
* It resets cookie information (destroying any autologin key within that cookie data)
* and update the users information from the relevant session data. It will then
* grab guest user information.
*/
function session_kill($new_session = true)
{
global $SID, $_SID, $db, $config, $phpbb_root_path, $phpEx;
$sql = 'DELETE FROM ' . SESSIONS_TABLE . "
WHERE session_id = '" . $db->sql_escape($this->session_id) . "'
AND session_user_id = " . (int) $this->data['user_id'];
$db->sql_query($sql);
// Allow connecting logout with external auth method logout
$method = basename(trim($config['auth_method']));
include_once($phpbb_root_path . 'includes/auth/auth_' . $method . '.' . $phpEx);
$method = 'logout_' . $method;
if (function_exists($method))
{
$method($this->data, $new_session);
}
if ($this->data['user_id'] != ANONYMOUS)
{
// Delete existing session, update last visit info first!
if (!isset($this->data['session_time']))
{
$this->data['session_time'] = time();
}
$sql = 'UPDATE ' . USERS_TABLE . '
SET user_lastvisit = ' . (int) $this->data['session_time'] . '
WHERE user_id = ' . (int) $this->data['user_id'];
$db->sql_query($sql);
if ($this->cookie_data['k'])
{
$sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . '
WHERE user_id = ' . (int) $this->data['user_id'] . "
AND key_id = '" . $db->sql_escape(md5($this->cookie_data['k'])) . "'";
$db->sql_query($sql);
}
// Reset the data array
$this->data = array();
$sql = 'SELECT *
FROM ' . USERS_TABLE . '
WHERE user_id = ' . ANONYMOUS;
$result = $db->sql_query($sql);
$this->data = $db->sql_fetchrow($result);
$db->sql_freeresult($result);
}
$cookie_expire = $this->time_now - 31536000;
$this->set_cookie('u', '', $cookie_expire);
$this->set_cookie('k', '', $cookie_expire);
$this->set_cookie('sid', '', $cookie_expire);
unset($cookie_expire);
$SID = '?sid=';
$this->session_id = $_SID = '';
// To make sure a valid session is created we create one for the anonymous user
if ($new_session)
{
$this->session_create(ANONYMOUS);
}
return true;
}
/**
* Session garbage collection
*
* This looks a lot more complex than it really is. Effectively we are
* deleting any sessions older than an admin definable limit. Due to the
* way in which we maintain session data we have to ensure we update user
* data before those sessions are destroyed. In addition this method
* removes autologin key information that is older than an admin defined
* limit.
*/
function session_gc()
{
global $db, $config, $phpbb_root_path, $phpEx;
$batch_size = 10;
if (!$this->time_now)
{
$this->time_now = time();
}
// Firstly, delete guest sessions
$sql = 'DELETE FROM ' . SESSIONS_TABLE . '
WHERE session_user_id = ' . ANONYMOUS . '
AND session_time < ' . (int) ($this->time_now - $config['session_length']);
$db->sql_query($sql);
// Get expired sessions, only most recent for each user
$sql = 'SELECT session_user_id, session_page, MAX(session_time) AS recent_time
FROM ' . SESSIONS_TABLE . '
WHERE session_time < ' . ($this->time_now - $config['session_length']) . '
GROUP BY session_user_id, session_page';
$result = $db->sql_query_limit($sql, $batch_size);
$del_user_id = array();
$del_sessions = 0;
while ($row = $db->sql_fetchrow($result))
{
$sql = 'UPDATE ' . USERS_TABLE . '
SET user_lastvisit = ' . (int) $row['recent_time'] . ", user_lastpage = '" . $db->sql_escape($row['session_page']) . "'
WHERE user_id = " . (int) $row['session_user_id'];
$db->sql_query($sql);
$del_user_id[] = (int) $row['session_user_id'];
$del_sessions++;
}
$db->sql_freeresult($result);
if (sizeof($del_user_id))
{
// Delete expired sessions
$sql = 'DELETE FROM ' . SESSIONS_TABLE . '
WHERE ' . $db->sql_in_set('session_user_id', $del_user_id) . '
AND session_time < ' . ($this->time_now - $config['session_length']);
$db->sql_query($sql);
}
if ($del_sessions < $batch_size)
{
// Less than 10 users, update gc timer ... else we want gc
// called again to delete other sessions
set_config('session_last_gc', $this->time_now, true);
if ($config['max_autologin_time'])
{
$sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . '
WHERE last_login < ' . (time() - (86400 * (int) $config['max_autologin_time']));
$db->sql_query($sql);
}
// only called from CRON; should be a safe workaround until the infrastructure gets going
if (!class_exists('phpbb_captcha_factory', false))
{
include($phpbb_root_path . "includes/captcha/captcha_factory." . $phpEx);
}
phpbb_captcha_factory::garbage_collect($config['captcha_plugin']);
$sql = 'DELETE FROM ' . LOGIN_ATTEMPT_TABLE . '
WHERE attempt_time < ' . (time() - (int) $config['ip_login_limit_time']);
$db->sql_query($sql);
}
return;
}
/**
* Sets a cookie
*
* Sets a cookie of the given name with the specified data for the given length of time. If no time is specified, a session cookie will be set.
*
* @param string $name Name of the cookie, will be automatically prefixed with the phpBB cookie name. track becomes [cookie_name]_track then.
* @param string $cookiedata The data to hold within the cookie
* @param int $cookietime The expiration time as UNIX timestamp. If 0 is provided, a session cookie is set.
*/
function set_cookie($name, $cookiedata, $cookietime)
{
global $config;
$name_data = rawurlencode($config['cookie_name'] . '_' . $name) . '=' . rawurlencode($cookiedata);
$expire = gmdate('D, d-M-Y H:i:s \\G\\M\\T', $cookietime);
$domain = (!$config['cookie_domain'] || $config['cookie_domain'] == 'localhost' || $config['cookie_domain'] == '127.0.0.1') ? '' : '; domain=' . $config['cookie_domain'];
header('Set-Cookie: ' . $name_data . (($cookietime) ? '; expires=' . $expire : '') . '; path=' . $config['cookie_path'] . $domain . ((!$config['cookie_secure']) ? '' : '; secure') . '; HttpOnly', false);
}
/**
* Check for banned user
*
* Checks whether the supplied user is banned by id, ip or email. If no parameters
* are passed to the method pre-existing session data is used. If $return is false
* this routine does not return on finding a banned user, it outputs a relevant
* message and stops execution.
*
* @param string|array $user_ips Can contain a string with one IP or an array of multiple IPs
*/
function check_ban($user_id = false, $user_ips = false, $user_email = false, $return = false)
{
global $config, $db;
if (defined('IN_CHECK_BAN'))
{
return;
}
$banned = false;
$cache_ttl = 3600;
$where_sql = array();
$sql = 'SELECT ban_ip, ban_userid, ban_email, ban_exclude, ban_give_reason, ban_end
FROM ' . BANLIST_TABLE . '
WHERE ';
// Determine which entries to check, only return those
if ($user_email === false)
{
$where_sql[] = "ban_email = ''";
}
if ($user_ips === false)
{
$where_sql[] = "(ban_ip = '' OR ban_exclude = 1)";
}
if ($user_id === false)
{
$where_sql[] = '(ban_userid = 0 OR ban_exclude = 1)';
}
else
{
$cache_ttl = ($user_id == ANONYMOUS) ? 3600 : 0;
$_sql = '(ban_userid = ' . $user_id;
if ($user_email !== false)
{
$_sql .= " OR ban_email <> ''";
}
if ($user_ips !== false)
{
$_sql .= " OR ban_ip <> ''";
}
$_sql .= ')';
$where_sql[] = $_sql;
}
$sql .= (sizeof($where_sql)) ? implode(' AND ', $where_sql) : '';
$result = $db->sql_query($sql, $cache_ttl);
$ban_triggered_by = 'user';
while ($row = $db->sql_fetchrow($result))
{
if ($row['ban_end'] && $row['ban_end'] < time())
{
continue;
}
$ip_banned = false;
if (!empty($row['ban_ip']))
{
if (!is_array($user_ips))
{
$ip_banned = preg_match('#^' . str_replace('\*', '.*?', preg_quote($row['ban_ip'], '#')) . '$#i', $user_ips);
}
else
{
foreach ($user_ips as $user_ip)
{
if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($row['ban_ip'], '#')) . '$#i', $user_ip))
{
$ip_banned = true;
break;
}
}
}
}
if ((!empty($row['ban_userid']) && intval($row['ban_userid']) == $user_id) ||
$ip_banned ||
(!empty($row['ban_email']) && preg_match('#^' . str_replace('\*', '.*?', preg_quote($row['ban_email'], '#')) . '$#i', $user_email)))
{
if (!empty($row['ban_exclude']))
{
$banned = false;
break;
}
else
{
$banned = true;
$ban_row = $row;
if (!empty($row['ban_userid']) && intval($row['ban_userid']) == $user_id)
{
$ban_triggered_by = 'user';
}
else if ($ip_banned)
{
$ban_triggered_by = 'ip';
}
else
{
$ban_triggered_by = 'email';
}
// Don't break. Check if there is an exclude rule for this user
}
}
}
$db->sql_freeresult($result);
if ($banned && !$return)
{
global $template;
// If the session is empty we need to create a valid one...
if (empty($this->session_id))
{
// This seems to be no longer needed? - #14971
// $this->session_create(ANONYMOUS);
}
// Initiate environment ... since it won't be set at this stage
$this->setup();
// Logout the user, banned users are unable to use the normal 'logout' link
if ($this->data['user_id'] != ANONYMOUS)
{
$this->session_kill();
}
// We show a login box here to allow founders accessing the board if banned by IP
if (defined('IN_LOGIN') && $this->data['user_id'] == ANONYMOUS)
{
global $phpEx;
$this->setup('ucp');
$this->data['is_registered'] = $this->data['is_bot'] = false;
// Set as a precaution to allow login_box() handling this case correctly as well as this function not being executed again.
define('IN_CHECK_BAN', 1);
login_box("index.$phpEx");
// The false here is needed, else the user is able to circumvent the ban.
$this->session_kill(false);
}
// Ok, we catch the case of an empty session id for the anonymous user...
// This can happen if the user is logging in, banned by username and the login_box() being called "again".
if (empty($this->session_id) && defined('IN_CHECK_BAN'))
{
$this->session_create(ANONYMOUS);
}
// Determine which message to output
$till_date = ($ban_row['ban_end']) ? $this->format_date($ban_row['ban_end']) : '';
$message = ($ban_row['ban_end']) ? 'BOARD_BAN_TIME' : 'BOARD_BAN_PERM';
$message = sprintf($this->lang[$message], $till_date, '<a href="mailto:' . $config['board_contact'] . '">', '</a>');
$message .= ($ban_row['ban_give_reason']) ? '<br /><br />' . sprintf($this->lang['BOARD_BAN_REASON'], $ban_row['ban_give_reason']) : '';
$message .= '<br /><br /><em>' . $this->lang['BAN_TRIGGERED_BY_' . strtoupper($ban_triggered_by)] . '</em>';
// To circumvent session_begin returning a valid value and the check_ban() not called on second page view, we kill the session again
$this->session_kill(false);
// A very special case... we are within the cron script which is not supposed to print out the ban message... show blank page
if (defined('IN_CRON'))
{
garbage_collection();
exit_handler();
exit;
}
trigger_error($message);
}
return ($banned && $ban_row['ban_give_reason']) ? $ban_row['ban_give_reason'] : $banned;
}
/**
* Check if ip is blacklisted
* This should be called only where absolutly necessary
*
* Only IPv4 (rbldns does not support AAAA records/IPv6 lookups)
*
* @author satmd (from the php manual)
* @param string $mode register/post - spamcop for example is ommitted for posting
* @return false if ip is not blacklisted, else an array([checked server], [lookup])
*/
function check_dnsbl($mode, $ip = false)
{
if ($ip === false)
{
$ip = $this->ip;
}
// Neither Spamhaus nor Spamcop supports IPv6 addresses.
if (strpos($ip, ':') !== false)
{
return false;
}
$dnsbl_check = array(
'sbl.spamhaus.org' => 'http://www.spamhaus.org/query/bl?ip=',
);
if ($mode == 'register')
{
$dnsbl_check['bl.spamcop.net'] = 'http://spamcop.net/bl.shtml?';
}
if ($ip)
{
$quads = explode('.', $ip);
$reverse_ip = $quads[3] . '.' . $quads[2] . '.' . $quads[1] . '.' . $quads[0];
// Need to be listed on all servers...
$listed = true;
$info = array();
foreach ($dnsbl_check as $dnsbl => $lookup)
{
if (phpbb_checkdnsrr($reverse_ip . '.' . $dnsbl . '.', 'A') === true)
{
$info = array($dnsbl, $lookup . $ip);
}
else
{
$listed = false;
}
}
if ($listed)
{
return $info;
}
}
return false;
}
/**
* Check if URI is blacklisted
* This should be called only where absolutly necessary, for example on the submitted website field
* This function is not in use at the moment and is only included for testing purposes, it may not work at all!
* This means it is untested at the moment and therefore commented out
*
* @param string $uri URI to check
* @return true if uri is on blacklist, else false. Only blacklist is checked (~zero FP), no grey lists
function check_uribl($uri)
{
// Normally parse_url() is not intended to parse uris
// We need to get the top-level domain name anyway... change.
$uri = parse_url($uri);
if ($uri === false || empty($uri['host']))
{
return false;
}
$uri = trim($uri['host']);
if ($uri)
{
// One problem here... the return parameter for the "windows" method is different from what
// we expect... this may render this check useless...
if (phpbb_checkdnsrr($uri . '.multi.uribl.com.', 'A') === true)
{
return true;
}
}
return false;
}
*/
/**
* Set/Update a persistent login key
*
* This method creates or updates a persistent session key. When a user makes
* use of persistent (formerly auto-) logins a key is generated and stored in the
* DB. When they revisit with the same key it's automatically updated in both the
* DB and cookie. Multiple keys may exist for each user representing different
* browsers or locations. As with _any_ non-secure-socket no passphrase login this
* remains vulnerable to exploit.
*/
function set_login_key($user_id = false, $key = false, $user_ip = false)
{
global $config, $db;
$user_id = ($user_id === false) ? $this->data['user_id'] : $user_id;
$user_ip = ($user_ip === false) ? $this->ip : $user_ip;
$key = ($key === false) ? (($this->cookie_data['k']) ? $this->cookie_data['k'] : false) : $key;
$key_id = unique_id(hexdec(substr($this->session_id, 0, 8)));
$sql_ary = array(
'key_id' => (string) md5($key_id),
'last_ip' => (string) $this->ip,
'last_login' => (int) time()
);
if (!$key)
{
$sql_ary += array(
'user_id' => (int) $user_id
);
}
if ($key)
{
$sql = 'UPDATE ' . SESSIONS_KEYS_TABLE . '
SET ' . $db->sql_build_array('UPDATE', $sql_ary) . '
WHERE user_id = ' . (int) $user_id . "
AND key_id = '" . $db->sql_escape(md5($key)) . "'";
}
else
{
$sql = 'INSERT INTO ' . SESSIONS_KEYS_TABLE . ' ' . $db->sql_build_array('INSERT', $sql_ary);
}
$db->sql_query($sql);
$this->cookie_data['k'] = $key_id;
return false;
}
/**
* Reset all login keys for the specified user
*
* This method removes all current login keys for a specified (or the current)
* user. It will be called on password change to render old keys unusable
*/
function reset_login_keys($user_id = false)
{
global $config, $db;
$user_id = ($user_id === false) ? (int) $this->data['user_id'] : (int) $user_id;
$sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . '
WHERE user_id = ' . (int) $user_id;
$db->sql_query($sql);
// If the user is logged in, update last visit info first before deleting sessions
$sql = 'SELECT session_time, session_page
FROM ' . SESSIONS_TABLE . '
WHERE session_user_id = ' . (int) $user_id . '
ORDER BY session_time DESC';
$result = $db->sql_query_limit($sql, 1);
$row = $db->sql_fetchrow($result);
$db->sql_freeresult($result);
if ($row)
{
$sql = 'UPDATE ' . USERS_TABLE . '
SET user_lastvisit = ' . (int) $row['session_time'] . ", user_lastpage = '" . $db->sql_escape($row['session_page']) . "'
WHERE user_id = " . (int) $user_id;
$db->sql_query($sql);
}
// Let's also clear any current sessions for the specified user_id
// If it's the current user then we'll leave this session intact
$sql_where = 'session_user_id = ' . (int) $user_id;
$sql_where .= ($user_id === (int) $this->data['user_id']) ? " AND session_id <> '" . $db->sql_escape($this->session_id) . "'" : '';
$sql = 'DELETE FROM ' . SESSIONS_TABLE . "
WHERE $sql_where";
$db->sql_query($sql);
// We're changing the password of the current user and they have a key
// Lets regenerate it to be safe
if ($user_id === (int) $this->data['user_id'] && $this->cookie_data['k'])
{
$this->set_login_key($user_id);
}
}
/**
* Check if the request originated from the same page.
* @param bool $check_script_path If true, the path will be checked as well
*/
function validate_referer($check_script_path = false)
{
global $config, $request;
// no referer - nothing to validate, user's fault for turning it off (we only check on POST; so meta can't be the reason)
if (empty($this->referer) || empty($this->host))
{
return true;
}
$host = htmlspecialchars($this->host);
$ref = substr($this->referer, strpos($this->referer, '://') + 3);
if (!(stripos($ref, $host) === 0) && (!$config['force_server_vars'] || !(stripos($ref, $config['server_name']) === 0)))
{
return false;
}
else if ($check_script_path && rtrim($this->page['root_script_path'], '/') !== '')
{
$ref = substr($ref, strlen($host));
$server_port = $request->server('SERVER_PORT', 0);
if ($server_port !== 80 && $server_port !== 443 && stripos($ref, ":$server_port") === 0)
{
$ref = substr($ref, strlen(":$server_port"));
}
if (!(stripos(rtrim($ref, '/'), rtrim($this->page['root_script_path'], '/')) === 0))
{
return false;
}
}
return true;
}
function unset_admin()
{
global $db;
$sql = 'UPDATE ' . SESSIONS_TABLE . '
SET session_admin = 0
WHERE session_id = \'' . $db->sql_escape($this->session_id) . '\'';
$db->sql_query($sql);
}
/**
* Update the session data
*
* @param array $session_data associative array of session keys to be updated
* @param string $session_id optional session_id, defaults to current user's session_id
*/
public function update_session($session_data, $session_id = null)
{
global $db;
$session_id = ($session_id) ? $session_id : $this->session_id;
$sql = 'UPDATE ' . SESSIONS_TABLE . ' SET ' . $db->sql_build_array('UPDATE', $session_data) . "
WHERE session_id = '" . $db->sql_escape($session_id) . "'";
$db->sql_query($sql);
}
}
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