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php-phpbb/phpBB/includes/sessions.php
Paul S. Owen 913fcffdfe doh, brain fart 
git-svn-id: file:///svn/phpbb/trunk@1946 89ea8834-ac86-4346-8a33-228a782c2dd0
2002-01-25 02:22:48 +00:00

428 lines
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PHP
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<?php
/***************************************************************************
* sessions.php
* -------------------
* begin : Saturday, Feb 13, 2001
* copyright : (C) 2001 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.
*
***************************************************************************/
//
// session_begin()
//
// 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, $session_length, $auto_create = 0, $enable_autologin = 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']) )
{
$sessiondata = isset($HTTP_COOKIE_VARS[$cookiename . '_data']) ? unserialize(stripslashes($HTTP_COOKIE_VARS[$cookiename . '_data'])) : "";
$session_id = isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) ? stripslashes($HTTP_COOKIE_VARS[$cookiename . '_sid']) : "";
$sessionmethod = SESSION_METHOD_COOKIE;
}
else
{
$session_id = ( isset($HTTP_GET_VARS['sid']) ) ? $HTTP_GET_VARS['sid'] : "";
$sessionmethod = SESSION_METHOD_GET;
}
$current_time = time();
$expiry_time = $current_time - $session_length;
//
// Try and pull the last time stored
// in a cookie, if it exists
//
if( $user_id != ANONYMOUS )
{
//
// This is a 'work-around' since I managed to
// freeze the schema without re-visiting sessions,
// what's needed is a session timer in the user table
// + the user_lastvisit ... damn damn damn damn and blast
//
$sql = "SELECT user_password, user_session_time, user_email
FROM " . USERS_TABLE . "
WHERE user_id = $user_id";
$result = $db->sql_query($sql);
if( !$result )
{
message_die(CRITICAL_ERROR, "Couldn't obtain lastvisit data from user table", "", __LINE__, __FILE__, $sql);
}
$row = $db->sql_fetchrow($result);
$auto_login_key = $row['user_password'];
if( $auto_create )
{
if( isset($sessiondata['autologinid']) )
{
// We have to login automagically
if( $sessiondata['autologinid'] == $auto_login_key )
{
// autologinid matches password
$login = 1;
$enable_autologin = 1;
$sessiondata['lastvisit'] = ( $row['user_session_time'] > 0 ) ? $row['user_session_time'] : $current_time;
}
else
{
// No match; don't login, set as anonymous user
$login = 0;
$enable_autologin = 0;
$user_id = ANONYMOUS;
}
}
else
{
// Autologin is not set. Don't login, set as anonymous user
$login = 0;
$enable_autologin = 0;
$user_id = ANONYMOUS;
}
}
else
{
$sessiondata['lastvisit'] = ( $row['user_session_time'] > 0 ) ? $row['user_session_time'] : $current_time;
$login = 1;
}
}
else
{
$login = 0;
$enable_autologin = 0;
}
//
// Initial ban check against user id, IP and email address
//
ereg("(..)(..)(..)(..)", $user_ip, $user_ip_parts);
$sql = "SELECT ban_ip, ban_userid, ban_email
FROM " . BANLIST_TABLE . "
WHERE ban_ip = '" . $user_ip_parts[1] . $user_ip_parts[2] . $user_ip_parts[3] . $user_ip_parts[4] . "'
OR ban_ip = '" . $user_ip_parts[1] . $user_ip_parts[2] . $user_ip_parts[3] . "ff'
OR ban_ip = '" . $user_ip_parts[1] . $user_ip_parts[2] . "ffff'
OR ban_ip = '" . $user_ip_parts[1] . "ffffff'
OR ban_userid = $user_id";
if( $user_id != ANONYMOUS )
{
$sql .= " OR ban_email LIKE '" . str_replace("\'", "''", $row['user_email']) . "'
OR ban_email LIKE '" . substr(str_replace("\'", "''", $row['user_email']), strpos(str_replace("\'", "''", $row['user_email']), "@")) . "'";
}
$result = $db->sql_query($sql);
if( !$result )
{
message_die(CRITICAL_ERROR, "Couldn't obtain ban information.", "", __LINE__, __FILE__, $sql);
}
$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
WHERE session_id = '" . $session_id . "'
AND session_ip = '$user_ip'";
$result = $db->sql_query($sql);
if( !$result || !$db->sql_affectedrows() )
{
$session_id = md5(uniqid($user_ip));
$sql = "INSERT INTO " . SESSIONS_TABLE . "
(session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in)
VALUES ('$session_id', $user_id, $current_time, $current_time, '$user_ip', $page_id, $login)";
$result = $db->sql_query($sql);
if(!$result)
{
message_die(CRITICAL_ERROR, "Error creating new session : session_begin", "", __LINE__, __FILE__, $sql);
}
}
if( $user_id != ANONYMOUS )
{
$sql = "UPDATE " . USERS_TABLE . "
SET user_session_time = $current_time, user_session_page = $page_id, user_lastvisit = " . $sessiondata['lastvisit'] . "
WHERE user_id = $user_id";
if( !$db->sql_query($sql) )
{
message_die(CRITICAL_ERROR, "Error updating last visit time : session_begin", "", __LINE__, __FILE__, $sql);
}
$sessiondata['autologinid'] = ( $enable_autologin && $sessionmethod == SESSION_METHOD_COOKIE ) ? $auto_login_key : "";
$sessiondata['userid'] = $user_id;
}
$serialised_cookiedata = serialize($sessiondata);
setcookie($cookiename . '_data', $serialised_cookiedata, ($current_time + 31536000), $cookiepath, $cookiedomain, $cookiesecure);
setcookie($cookiename . '_sid', $session_id, 0, $cookiepath, $cookiedomain, $cookiesecure);
$SID = ( $sessionmethod == SESSION_METHOD_GET ) ? "sid=" . $session_id : "";
return $session_id;
} // session_begin
//
// Checks for a given user session, tidies session
// table and updates user sessions at each page refresh
//
function session_pagestart($user_ip, $thispage_id, $session_length)
{
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'])) : "";
$session_id = isset( $HTTP_COOKIE_VARS[$cookiename . '_sid'] ) ? stripslashes($HTTP_COOKIE_VARS[$cookiename . '_sid']) : "";
$sessionmethod = SESSION_METHOD_COOKIE;
}
else
{
$session_id = ( isset($HTTP_GET_VARS['sid']) ) ? $HTTP_GET_VARS['sid'] : "";
$sessionmethod = SESSION_METHOD_GET;
}
//
// Does a session exist?
//
if( !empty($session_id) )
{
//
// session_id exists so go ahead and attempt to grab all
// data in preparation
//
$sql = "SELECT u.*, s.*
FROM " . SESSIONS_TABLE . " s, " . USERS_TABLE . " u
WHERE s.session_id = '$session_id'
AND u.user_id = s.session_user_id
AND s.session_ip = '$user_ip'";
$result = $db->sql_query($sql);
if( !$result )
{
message_die(CRITICAL_ERROR, "Error doing DB query userdata row fetch : session_pagestart", "", __LINE__, __FILE__, $sql);
}
$userdata = $db->sql_fetchrow($result);
//
// Did the session exist in the DB?
//
if( isset($userdata['user_id']) )
{
$SID = ( $sessionmethod == SESSION_METHOD_GET ) ? "sid=" . $session_id : "";
//
// Only update session DB a minute or so after last update
//
$last_update = ( $userdata['user_id'] == ANONYMOUS ) ? $userdata['session_time'] : $userdata['user_session_time'];
if( $current_time - $last_update > 60 )
{
if( $userdata['user_id'] == ANONYMOUS )
{
$sessiondata['lastvisit'] = $current_time;
$sql = "UPDATE " . SESSIONS_TABLE . "
SET session_time = $current_time, session_page = $thispage_id
WHERE session_id = '" . $userdata['session_id'] . "'
AND session_ip = '$user_ip'";
}
else
{
$sql = "UPDATE " . USERS_TABLE . "
SET user_session_time = $current_time, user_session_page = $thispage_id
WHERE user_id = " . $userdata['user_id'];
}
if( !$db->sql_query($sql) )
{
message_die(CRITICAL_ERROR, "Error updating sessions table : session_pagestart", "", __LINE__, __FILE__, $sql);
}
//
// Delete expired sessions
//
$expiry_time = $current_time - $board_config['session_length'];
$sql = "DELETE FROM " . SESSIONS_TABLE . "
WHERE session_time < $expiry_time
AND session_id <> '$session_id'";
$result = $db->sql_query($sql);
if( !$result )
{
message_die(CRITICAL_ERROR, "Error clearing sessions table : session_pagestart", "", __LINE__, __FILE__, $sql);
}
}
setcookie($board_config['cookie_name'] . '_data', serialize($sessiondata), ($current_time + 31536000), $board_config['cookie_path'], $board_config['cookie_domain'], $board_config['cookie_secure']);
setcookie($board_config['cookie_name'] . '_sid', $session_id, 0, $board_config['cookie_path'], $board_config['cookie_domain'], $board_config['cookie_secure']);
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']) ) ? $sessiondata['userid'] : ANONYMOUS;
$result_id = session_begin($user_id, $user_ip, $thispage_id, $board_config['session_length'], TRUE);
if( !$result_id )
{
message_die(CRITICAL_ERROR, "Error creating user session : session_pagestart", "", __LINE__, __FILE__, $sql);
}
else
{
$sql = "SELECT u.*, s.*
FROM " . SESSIONS_TABLE . " s, " . USERS_TABLE . " u
WHERE s.session_id = '$result_id'
AND u.user_id = s.session_user_id
AND s.session_ip = '$user_ip'";
$result = $db->sql_query($sql);
if ( !$result )
{
message_die(CRITICAL_ERROR, "Error doing DB query userdata row fetch : session_pagestart new user", "", __LINE__, __FILE__, $sql);
}
$userdata = $db->sql_fetchrow($result);
}
return $userdata;
} // session_pagestart()
//
// session_end closes out a session
// deleting the corresponding entry
// in the sessions table
//
function session_end($session_id, $user_id)
{
global $db, $lang, $board_config;
global $HTTP_COOKIE_VARS, $HTTP_GET_VARS, $SID;
$cookiename = $board_config['cookie_name'];
$cookiepath = $board_config['cookie_path'];
$cookiedomain = $board_config['cookie_domain'];
$cookiesecure = $board_config['cookie_secure'];
$current_time = time();
//
// Pull cookiedata or grab the URI propagated sid
//
if( isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) || isset($HTTP_COOKIE_VARS[$cookiename . '_data']) )
{
$sessiondata = isset( $HTTP_COOKIE_VARS[$cookiename . '_data'] ) ? unserialize(stripslashes($HTTP_COOKIE_VARS[$cookiename . '_data'])) : "";
$session_id = isset( $HTTP_COOKIE_VARS[$cookiename . '_sid'] ) ? $HTTP_COOKIE_VARS[$cookiename . '_sid'] : "";
$sessionmethod = SESSION_METHOD_COOKIE;
}
else
{
$session_id = ( isset($HTTP_GET_VARS['sid']) ) ? $HTTP_GET_VARS['sid'] : "";
$sessionmethod = SESSION_METHOD_GET;
}
//
// Delete existing session
//
$sql = "DELETE FROM " . SESSIONS_TABLE . "
WHERE session_id = '$session_id'
AND session_user_id = $user_id";
$result = $db->sql_query($sql);
if(!$result)
{
message_die(CRITICAL_ERROR, "Error removing user session : session_end", "", __LINE__, __FILE__, $sql);
}
//
// If a registered user then update their last visit
// and autologin (if necessary) details
//
if( $user_id != ANONYMOUS )
{
if( isset($sessiondata['autologinid']) && $sessionmethod == SESSION_METHOD_COOKIE )
{
unset($sessiondata['autologinid']);
}
}
$sessiondata['userid'] = ANONYMOUS;
$serialised_cookiedata = serialize($sessiondata);
setcookie($cookiename . '_data', $serialised_cookiedata, ($current_time + 31536000), $cookiepath, $cookiedomain, $cookiesecure);
setcookie($cookiename . '_sid', '', 0, $cookiepath, $cookiedomain, $cookiesecure);
$SID = ($sessionmethod == SESSION_METHOD_GET) ? "sid=" . $session_id : "";
return TRUE;
} // session_end()
//
//
// 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) && !eregi("sid=", $url) )
{
$url .= ( ( strpos($url, "?") != false ) ? ( ( $non_html_amp ) ? "&" : "&amp;" ) : "?" ) . $SID;
}
return($url);
}
?>
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