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git-svn-id: file:///svn/phpbb/branches/phpBB-2_0_0@3203 89ea8834-ac86-4346-8a33-228a782c2dd0
381 lines
12 KiB
PHP
381 lines
12 KiB
PHP
<?php
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/***************************************************************************
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* sessions.php
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* -------------------
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* begin : Saturday, Feb 13, 2001
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* copyright : (C) 2001 The phpBB Group
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* email : support@phpbb.com
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*
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* $Id$
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*
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*
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***************************************************************************/
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/***************************************************************************
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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***************************************************************************/
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//
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// Adds/updates a new session to the database for the given userid.
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// Returns the new session ID on success.
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//
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function session_begin($user_id, $user_ip, $page_id, $auto_create = 0, $enable_autologin = 0)
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{
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global $db, $board_config;
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global $HTTP_COOKIE_VARS, $HTTP_GET_VARS, $SID;
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$cookiename = $board_config['cookie_name'];
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$cookiepath = $board_config['cookie_path'];
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$cookiedomain = $board_config['cookie_domain'];
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$cookiesecure = $board_config['cookie_secure'];
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if ( isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) || isset($HTTP_COOKIE_VARS[$cookiename . '_data']) )
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{
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$session_id = isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) ? $HTTP_COOKIE_VARS[$cookiename . '_sid'] : '';
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$sessiondata = isset($HTTP_COOKIE_VARS[$cookiename . '_data']) ? unserialize(stripslashes($HTTP_COOKIE_VARS[$cookiename . '_data'])) : '';
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$sessionmethod = SESSION_METHOD_COOKIE;
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}
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else
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{
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$sessiondata = '';
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$session_id = ( isset($HTTP_GET_VARS['sid']) ) ? $HTTP_GET_VARS['sid'] : '';
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$sessionmethod = SESSION_METHOD_GET;
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}
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$last_visit = 0;
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$current_time = time();
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$expiry_time = $current_time - $board_config['session_length'];
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//
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// Try and pull the last time stored in a cookie, if it exists
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//
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$sql = "SELECT *
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FROM " . USERS_TABLE . "
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WHERE user_id = $user_id";
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if ( !($result = $db->sql_query($sql)) )
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{
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message_die(CRITICAL_ERROR, 'Could not obtain lastvisit data from user table', '', __LINE__, __FILE__, $sql);
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}
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$userdata = $db->sql_fetchrow($result);
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if ( $user_id != ANONYMOUS )
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{
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$auto_login_key = $userdata['user_password'];
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if ( $auto_create )
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{
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if ( isset($sessiondata['autologinid']) && $userdata['user_active'] )
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{
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// We have to login automagically
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if( $sessiondata['autologinid'] == $auto_login_key )
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{
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// autologinid matches password
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$login = 1;
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$enable_autologin = 1;
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}
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else
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{
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// No match; don't login, set as anonymous user
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$login = 0;
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$enable_autologin = 0;
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$user_id = $userdata['user_id'] = ANONYMOUS;
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}
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}
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else
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{
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// Autologin is not set. Don't login, set as anonymous user
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$login = 0;
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$enable_autologin = 0;
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$user_id = $userdata['user_id'] = ANONYMOUS;
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}
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}
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else
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{
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$login = 1;
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}
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}
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else
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{
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$login = 0;
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$enable_autologin = 0;
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}
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//
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// Initial ban check against user id, IP and email address
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//
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preg_match('/(..)(..)(..)(..)/', $user_ip, $user_ip_parts);
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$sql = "SELECT ban_ip, ban_userid, ban_email
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FROM " . BANLIST_TABLE . "
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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')
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OR ban_userid = $user_id";
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if ( $user_id != ANONYMOUS )
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{
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$sql .= " OR ban_email LIKE '" . str_replace("\'", "''", $userdata['user_email']) . "'
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OR ban_email LIKE '" . substr(str_replace("\'", "''", $userdata['user_email']), strpos(str_replace("\'", "''", $userdata['user_email']), "@")) . "'";
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}
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if ( !($result = $db->sql_query($sql)) )
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{
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message_die(CRITICAL_ERROR, 'Could not obtain ban information', '', __LINE__, __FILE__, $sql);
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}
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if ( $ban_info = $db->sql_fetchrow($result) )
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{
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if ( $ban_info['ban_ip'] || $ban_info['ban_userid'] || $ban_info['ban_email'] )
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{
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message_die(CRITICAL_MESSAGE, 'You_been_banned');
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}
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}
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//
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// Create or update the session
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//
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$sql = "UPDATE " . SESSIONS_TABLE . "
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SET session_user_id = $user_id, session_start = $current_time, session_time = $current_time, session_page = $page_id, session_logged_in = $login
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WHERE session_id = '" . $session_id . "'
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AND session_ip = '$user_ip'";
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if ( !$db->sql_query($sql) || !$db->sql_affectedrows() )
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{
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$session_id = md5(uniqid($user_ip));
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$sql = "INSERT INTO " . SESSIONS_TABLE . "
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(session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in)
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VALUES ('$session_id', $user_id, $current_time, $current_time, '$user_ip', $page_id, $login)";
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if ( !$db->sql_query($sql) )
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{
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message_die(CRITICAL_ERROR, 'Error creating new session', '', __LINE__, __FILE__, $sql);
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}
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}
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if ( $user_id != ANONYMOUS )
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{// ( $userdata['user_session_time'] > $expiry_time && $auto_create ) ? $userdata['user_lastvisit'] : (
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$last_visit = ( $userdata['user_session_time'] > 0 ) ? $userdata['user_session_time'] : $current_time;
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$sql = "UPDATE " . USERS_TABLE . "
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SET user_session_time = $current_time, user_session_page = $page_id, user_lastvisit = $last_visit
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WHERE user_id = $user_id";
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if ( !$db->sql_query($sql) )
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{
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message_die(CRITICAL_ERROR, 'Error updating last visit time', '', __LINE__, __FILE__, $sql);
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}
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$userdata['user_lastvisit'] = $last_visit;
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$sessiondata['autologinid'] = ( $enable_autologin && $sessionmethod == SESSION_METHOD_COOKIE ) ? $auto_login_key : '';
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$sessiondata['userid'] = $user_id;
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}
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$userdata['session_id'] = $session_id;
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$userdata['session_ip'] = $user_ip;
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$userdata['session_user_id'] = $user_id;
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$userdata['session_logged_in'] = $login;
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$userdata['session_page'] = $page_id;
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$userdata['session_start'] = $current_time;
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$userdata['session_time'] = $current_time;
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setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure);
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setcookie($cookiename . '_sid', $session_id, 0, $cookiepath, $cookiedomain, $cookiesecure);
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$SID = 'sid=' . $session_id;
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return $userdata;
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}
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//
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// Checks for a given user session, tidies session table and updates user
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// sessions at each page refresh
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//
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function session_pagestart($user_ip, $thispage_id)
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{
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global $db, $lang, $board_config;
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global $HTTP_COOKIE_VARS, $HTTP_GET_VARS, $SID;
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$cookiename = $board_config['cookie_name'];
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$cookiepath = $board_config['cookie_path'];
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$cookiedomain = $board_config['cookie_domain'];
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$cookiesecure = $board_config['cookie_secure'];
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$current_time = time();
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unset($userdata);
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if ( isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) || isset($HTTP_COOKIE_VARS[$cookiename . '_data']) )
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{
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$sessiondata = isset( $HTTP_COOKIE_VARS[$cookiename . '_data'] ) ? unserialize(stripslashes($HTTP_COOKIE_VARS[$cookiename . '_data'])) : '';
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$session_id = isset( $HTTP_COOKIE_VARS[$cookiename . '_sid'] ) ? $HTTP_COOKIE_VARS[$cookiename . '_sid'] : '';
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$sessionmethod = SESSION_METHOD_COOKIE;
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}
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else
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{
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$sessiondata = '';
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$session_id = ( isset($HTTP_GET_VARS['sid']) ) ? $HTTP_GET_VARS['sid'] : '';
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$sessionmethod = SESSION_METHOD_GET;
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}
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//
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// Does a session exist?
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//
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if ( !empty($session_id) )
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{
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//
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// session_id exists so go ahead and attempt to grab all
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// data in preparation
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//
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$sql = "SELECT u.*, s.*
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FROM " . SESSIONS_TABLE . " s, " . USERS_TABLE . " u
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WHERE s.session_id = '$session_id'
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AND u.user_id = s.session_user_id";
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if ( !($result = $db->sql_query($sql)) )
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{
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message_die(CRITICAL_ERROR, 'Error doing DB query userdata row fetch', '', __LINE__, __FILE__, $sql);
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}
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$userdata = $db->sql_fetchrow($result);
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//
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// Did the session exist in the DB?
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//
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if ( isset($userdata['user_id']) )
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{
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//
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// Do not check IP assuming equivalence, if IPv4 we'll check only first 24
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// bits ... I've been told (by vHiker) this should alleviate problems with
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// load balanced et al proxies while retaining some reliance on IP security.
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//
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$ip_check_s = substr($userdata['session_ip'], 0, 6);
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$ip_check_u = substr($user_ip, 0, 6);
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if ($ip_check_s == $ip_check_u)
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{
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$SID = ($sessionmethod == SESSION_METHOD_GET || defined('IN_ADMIN')) ? 'sid=' . $session_id : '';
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//
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// Only update session DB a minute or so after last update
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//
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if ( $current_time - $userdata['session_time'] > 60 )
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{
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$sql = "UPDATE " . SESSIONS_TABLE . "
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SET session_time = $current_time, session_page = $thispage_id
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WHERE session_id = '" . $userdata['session_id'] . "'";
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if ( !$db->sql_query($sql) )
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{
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message_die(CRITICAL_ERROR, 'Error updating sessions table', '', __LINE__, __FILE__, $sql);
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}
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if ( $userdata['user_id'] != ANONYMOUS )
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{
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$sql = "UPDATE " . USERS_TABLE . "
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SET user_session_time = $current_time, user_session_page = $thispage_id
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WHERE user_id = " . $userdata['user_id'];
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if ( !$db->sql_query($sql) )
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{
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message_die(CRITICAL_ERROR, 'Error updating sessions table', '', __LINE__, __FILE__, $sql);
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}
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}
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//
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// Delete expired sessions
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//
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$expiry_time = $current_time - $board_config['session_length'];
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$sql = "DELETE FROM " . SESSIONS_TABLE . "
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WHERE session_time < $expiry_time
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AND session_id <> '$session_id'";
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if ( !$db->sql_query($sql) )
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{
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message_die(CRITICAL_ERROR, 'Error clearing sessions table', '', __LINE__, __FILE__, $sql);
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}
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setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure);
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setcookie($cookiename . '_sid', $session_id, 0, $cookiepath, $cookiedomain, $cookiesecure);
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}
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return $userdata;
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}
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}
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}
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//
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// If we reach here then no (valid) session exists. So we'll create a new one,
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// using the cookie user_id if available to pull basic user prefs.
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//
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$user_id = ( isset($sessiondata['userid']) ) ? intval($sessiondata['userid']) : ANONYMOUS;
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if ( !($userdata = session_begin($user_id, $user_ip, $thispage_id, TRUE)) )
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{
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message_die(CRITICAL_ERROR, 'Error creating user session', '', __LINE__, __FILE__, $sql);
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}
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return $userdata;
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}
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//
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// session_end closes out a session
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// deleting the corresponding entry
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// in the sessions table
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//
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function session_end($session_id, $user_id)
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{
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global $db, $lang, $board_config;
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global $HTTP_COOKIE_VARS, $HTTP_GET_VARS, $SID;
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$cookiename = $board_config['cookie_name'];
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$cookiepath = $board_config['cookie_path'];
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$cookiedomain = $board_config['cookie_domain'];
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$cookiesecure = $board_config['cookie_secure'];
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//
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// Pull cookiedata or grab the URI propagated sid
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//
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if ( isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) )
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{
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$session_id = isset( $HTTP_COOKIE_VARS[$cookiename . '_sid'] ) ? $HTTP_COOKIE_VARS[$cookiename . '_sid'] : '';
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$sessionmethod = SESSION_METHOD_COOKIE;
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}
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else
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{
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$session_id = ( isset($HTTP_GET_VARS['sid']) ) ? $HTTP_GET_VARS['sid'] : '';
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$sessionmethod = SESSION_METHOD_GET;
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}
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//
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// Delete existing session
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//
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$sql = "DELETE FROM " . SESSIONS_TABLE . "
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WHERE session_id = '$session_id'
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AND session_user_id = $user_id";
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if ( !$db->sql_query($sql) )
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{
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message_die(CRITICAL_ERROR, 'Error removing user session', '', __LINE__, __FILE__, $sql);
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}
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setcookie($cookiename . '_data', '', $current_time - 31536000, $cookiepath, $cookiedomain, $cookiesecure);
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setcookie($cookiename . '_sid', '', $current_time - 31536000, $cookiepath, $cookiedomain, $cookiesecure);
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return true;
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}
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//
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// Append $SID to a url. Borrowed from phplib and modified. This is an
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// extra routine utilised by the session code above and acts as a wrapper
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// around every single URL and form action. If you replace the session
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// code you must include this routine, even if it's empty.
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//
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function append_sid($url, $non_html_amp = false)
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{
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global $SID;
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if ( !empty($SID) && !preg_match('#sid=#', $url) )
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{
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$url .= ( ( strpos($url, '?') != false ) ? ( ( $non_html_amp ) ? '&' : '&' ) : '?' ) . $SID;
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}
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return $url;
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}
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?>
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