<?php/**************************************************************************** sessions.php* -------------------* begin : Saturday, Feb 13, 2001* copyright : (C) 2001 The phpBB Group* email : support@phpbb.com** $Id: sessions.php,v 1.58.2.25 2006/05/18 19:23:07 grahamje 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;$current_time = time();//// Are auto-logins allowed?// If allow_autologin is not set or is true then they are// (same behaviour as old 2.0.x session code)//if (isset($board_config['allow_autologin']) && !$board_config['allow_autologin']){$enable_autologin = $sessiondata['autologinid'] = false;}//// First off attempt to join with the autologin value if we have one// If not, just use the user_id value//$userdata = array();if ($user_id != ANONYMOUS){if (isset($sessiondata['autologinid']) && (string) $sessiondata['autologinid'] != '' && $user_id){$sql = 'SELECT u.*FROM ' . USERS_TABLE . ' u, ' . SESSIONS_KEYS_TABLE . ' kWHERE u.user_id = ' . (int) $user_id . "AND u.user_active = 1AND k.user_id = u.user_idAND k.key_id = '" . md5($sessiondata['autologinid']) . "'";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);$db->sql_freeresult($result);$enable_autologin = $login = 1;}else if (!$auto_create){$sessiondata['autologinid'] = '';$sessiondata['userid'] = $user_id;$sql = 'SELECT *FROM ' . USERS_TABLE . 'WHERE user_id = ' . (int) $user_id . 'AND user_active = 1';if (!($result = $db->sql_query($sql))){message_die(CRITICAL_ERROR, 'Error doing DB query userdata row fetch', '', __LINE__, __FILE__, $sql);}$userdata = $db->sql_fetchrow($result);$db->sql_freeresult($result);$login = 1;}}//// At this point either $userdata should be populated or// one of the below is true// * Key didn't match one in the DB// * User does not exist// * User is inactive//if (!sizeof($userdata) || !is_array($userdata) || !$userdata){$sessiondata['autologinid'] = '';$sessiondata['userid'] = $user_id = ANONYMOUS;$enable_autologin = $login = 0;$sql = 'SELECT *FROM ' . USERS_TABLE . 'WHERE user_id = ' . (int) $user_id;if (!($result = $db->sql_query($sql))){message_die(CRITICAL_ERROR, 'Error doing DB query userdata row fetch', '', __LINE__, __FILE__, $sql);}$userdata = $db->sql_fetchrow($result);$db->sql_freeresult($result);}//// Initial ban check against user id, IP and email address//preg_match('/(..)(..)(..)(..)/', $user_ip, $user_ip_parts);$sql = "SELECT ban_ip, ban_userid, ban_emailFROM " . 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 = $adminWHERE session_id = '" . $session_id . "'AND session_ip = '$user_ip'";if ( !$db->sql_query($sql) || !$db->sql_affectedrows() ){$session_id = md5(dss_rand());$sql = "INSERT INTO " . SESSIONS_TABLE . "(session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin)VALUES ('$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 ( $user_id != ANONYMOUS ){$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_visitWHERE user_id = $user_id";if ( !$db->sql_query($sql) ){message_die(CRITICAL_ERROR, 'Error updating last visit time', '', __LINE__, __FILE__, $sql);}}$userdata['user_lastvisit'] = $last_visit;//// Regenerate the auto-login key//if ($enable_autologin){$auto_login_key = dss_rand() . dss_rand();if (isset($sessiondata['autologinid']) && (string) $sessiondata['autologinid'] != ''){$sql = 'UPDATE ' . SESSIONS_KEYS_TABLE . "SET last_ip = '$user_ip', key_id = '" . md5($auto_login_key) . "', last_login = $current_timeWHERE key_id = '" . md5($sessiondata['autologinid']) . "'";}else{$sql = 'INSERT INTO ' . SESSIONS_KEYS_TABLE . "(key_id, user_id, last_ip, last_login)VALUES ('" . md5($auto_login_key) . "', $user_id, '$user_ip', $current_time)";}if ( !$db->sql_query($sql) ){message_die(CRITICAL_ERROR, 'Error updating session key', '', __LINE__, __FILE__, $sql);}$sessiondata['autologinid'] = $auto_login_key;unset($auto_login_key);}else{$sessiondata['autologinid'] = '';}// $sessiondata['autologinid'] = (!$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'] = $admin;$userdata['session_key'] = $sessiondata['autologinid'];setcookie($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//$sql = "SELECT u.*, s.*FROM " . SESSIONS_TABLE . " s, " . USERS_TABLE . " uWHERE s.session_id = '$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_adminWHERE 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_idWHERE user_id = " . $userdata['user_id'];if ( !$db->sql_query($sql) ){message_die(CRITICAL_ERROR, 'Error updating sessions table', '', __LINE__, __FILE__, $sql);}}session_clean($userdata['session_id']);setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure);setcookie($cookiename . '_sid', $session_id, 0, $cookiepath, $cookiedomain, $cookiesecure);}// Add the session_key to the userdata array if it is setif ( isset($sessiondata['autologinid']) && $sessiondata['autologinid'] != '' ){$userdata['session_key'] = $sessiondata['autologinid'];}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 $userdata;}/*** Terminates the specified session* It will delete the entry in the sessions table for this session,* remove the corresponding auto-login key and reset the cookies*/function session_end($session_id, $user_id){global $db, $lang, $board_config, $userdata;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();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__, $sql);}//// Remove this auto-login entry (if applicable)//if ( isset($userdata['session_key']) && $userdata['session_key'] != '' ){$autologin_key = md5($userdata['session_key']);$sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . 'WHERE user_id = ' . (int) $user_id . "AND key_id = '$autologin_key'";if ( !$db->sql_query($sql) ){message_die(CRITICAL_ERROR, 'Error removing auto-login key', '', __LINE__, __FILE__, $sql);}}//// We expect that message_die will be called after this function,// but just in case it isn't, reset $userdata to the details for a guest//$sql = 'SELECT *FROM ' . USERS_TABLE . 'WHERE user_id = ' . ANONYMOUS;if ( !($result = $db->sql_query($sql)) ){message_die(CRITICAL_ERROR, 'Error obtaining user details', '', __LINE__, __FILE__, $sql);}if ( !($userdata = $db->sql_fetchrow($result)) ){message_die(CRITICAL_ERROR, 'Error obtaining user details', '', __LINE__, __FILE__, $sql);}$db->sql_freeresult($result);setcookie($cookiename . '_data', '', $current_time - 31536000, $cookiepath, $cookiedomain, $cookiesecure);setcookie($cookiename . '_sid', '', $current_time - 31536000, $cookiepath, $cookiedomain, $cookiesecure);return true;}/*** Removes expired sessions and auto-login keys from the database*/function session_clean($session_id){global $board_config, $db;//// Delete expired sessions//$sql = 'DELETE FROM ' . SESSIONS_TABLE . 'WHERE session_time < ' . (time() - (int) $board_config['session_length']) . "AND session_id <> '$session_id'";if ( !$db->sql_query($sql) ){message_die(CRITICAL_ERROR, 'Error clearing sessions table', '', __LINE__, __FILE__, $sql);}//// Delete expired auto-login keys// If max_autologin_time is not set then keys will never be deleted// (same behaviour as old 2.0.x session code)//if (!empty($board_config['max_autologin_time']) && $board_config['max_autologin_time'] > 0){$sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . 'WHERE last_login < ' . (time() - (86400 * (int) $board_config['max_autologin_time']));$db->sql_query($sql);}return true;}/*** Reset all login keys for the specified user* Called on password changes*/function session_reset_keys($user_id, $user_ip){global $db, $userdata, $board_config;$key_sql = ($user_id == $userdata['user_id'] && !empty($userdata['session_key'])) ? "AND key_id != '" . md5($userdata['session_key']) . "'" : '';$sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . 'WHERE user_id = ' . (int) $user_id . "$key_sql";if ( !$db->sql_query($sql) ){message_die(CRITICAL_ERROR, 'Error removing auto-login keys', '', __LINE__, __FILE__, $sql);}$where_sql = 'session_user_id = ' . (int) $user_id;$where_sql .= ($user_id == $userdata['user_id']) ? " AND session_id <> '" . $userdata['session_id'] . "'" : '';$sql = 'DELETE FROM ' . SESSIONS_TABLE . "WHERE $where_sql";if ( !$db->sql_query($sql) ){message_die(CRITICAL_ERROR, 'Error removing user session(s)', '', __LINE__, __FILE__, $sql);}if ( !empty($key_sql) ){$auto_login_key = dss_rand() . dss_rand();$current_time = time();$sql = 'UPDATE ' . SESSIONS_KEYS_TABLE . "SET last_ip = '$user_ip', key_id = '" . md5($auto_login_key) . "', last_login = $current_timeWHERE key_id = '" . md5($userdata['session_key']) . "'";if ( !$db->sql_query($sql) ){message_die(CRITICAL_ERROR, 'Error updating session key', '', __LINE__, __FILE__, $sql);}// And now rebuild the cookie$sessiondata['userid'] = $user_id;$sessiondata['autologinid'] = $auto_login_key;$cookiename = $board_config['cookie_name'];$cookiepath = $board_config['cookie_path'];$cookiedomain = $board_config['cookie_domain'];$cookiesecure = $board_config['cookie_secure'];setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure);$userdata['session_key'] = $auto_login_key;unset($sessiondata);unset($auto_login_key);}}//// 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;}?>