Sources LogInOut.php

Kod:

<?php
/**********************************************************************************
* LogInOut.php *
***********************************************************************************
* SMF: Simple Machines Forum *
* Open-Source Project Inspired by Zef Hemel (zef@zefhemel.com) *
* =============================================================================== *
* Software Version: SMF 1.1.2 *
* Software by: Simple Machines (http://www.simplemachines.org) *
* Copyright 2006 by: Simple Machines LLC (http://www.simplemachines.org) *
* 2001-2006 by: Lewis Media (http://www.lewismedia.com) *
* Support, News, Updates at: http://www.simplemachines.org *
***********************************************************************************
* This program is free software; you may redistribute it and/or modify it under *
* the terms of the provided license as published by Simple Machines LLC. *
* *
* This program is distributed in the hope that it is and will be useful, but *
* WITHOUT ANY WARRANTIES; without even any implied warranty of MERCHANTABILITY *
* or FITNESS FOR A PARTICULAR PURPOSE. *
* *
* See the "license.txt" file for details of the Simple Machines license. *
* The latest version can always be found at http://www.simplemachines.org. *
**********************************************************************************/
if (!defined('SMF'))
die('Hacking attempt...');

/* This file is concerned pretty entirely, as you see from its name, with
logging in and out members, and the validation of that. It contains:

void Login()
- shows a page for the user to type in their username and password.
- caches the referring URL in $_SESSION['login_url'].
- uses the Login template and language file with the login sub
 template.
- if you are using a wireless device, uses the protocol_login sub
 template in the Wireless template.
- accessed from ?action=login.

void Login2()
- actually logs you in and checks that login was successful.
- employs protection against a specific IP or user trying to brute
 force a login to an account.
- on error, uses the same templates Login() uses.
- upgrades password encryption on login, if necessary.
- after successful login, redirects you to $_SESSION['login_url'].
- accessed from ?action=login2, by forms.

void Logout(bool internal = false)
- logs the current user out of their account.
- requires that the session hash is sent as well, to prevent automatic
 logouts by images or javascript.
- doesn't check the session if internal is true.
- redirects back to $_SESSION['logout_url'], if it exists.
- accessed via ?action=logout;sc=...

string md5_hmac(string data, string key)
- old style SMF 1.0.x/YaBB SE 1.5.x hashing.
- returns the HMAC MD5 of data with key.
*/

// Ask them for their login information.
function Login()
{
global $txt, $context;

// In wireless? If so, use the correct sub template.
if (WIRELESS)
$context['sub_template'] = WIRELESS_PROTOCOL . '_login';
// Otherwise, we need to load the Login template/language file.
else
{
loadLanguage('Login');
loadTemplate('Login');
$context['sub_template'] = 'login';
}

// Get the template ready.... not really much else to do.
$context['page_title'] = $txt[34];
$context['default_username'] = &$_REQUEST['u'];
$context['default_password'] = '';
$context['never_expire'] = false;

// Set the login URL - will be used when the login process is done.
if (isset($_SESSION['old_url']) && preg_match('~(board|topic)[=,]~', $_SESSION['old_url']) != 0)
$_SESSION['login_url'] = $_SESSION['old_url'];
else
unset($_SESSION['login_url']);
}

// Perform the actual logging-in.
function Login2()
{
global $txt, $db_prefix, $scripturl, $user_info, $user_settings;
global $cookiename, $maintenance, $ID_MEMBER, $modSettings, $context, $sc;
global $sourcedir;

// Load cookie authentication stuff.
require_once($sourcedir . '/Subs-Auth.php');

if (isset($_GET['sa']) && $_GET['sa'] == 'salt' && !$user_info['is_guest'])
{
if (isset($_COOKIE[$cookiename]))
list (, , $timeout) = @unserialize($_COOKIE[$cookiename]);
elseif (isset($_SESSION['login_' . $cookiename]))
list (, , $timeout) = @unserialize(stripslashes($_SESSION['login_' . $cookiename]));
else
trigger_error('Login2(): Cannot be logged in without a session or cookie', E_USER_ERROR);

$user_settings['passwordSalt'] = substr(md5(rand()), 0, 4);
updateMemberData($ID_MEMBER, array('passwordSalt' => '\'' . $user_settings['passwordSalt'] . '\''));

setLoginCookie($timeout - time(), $ID_MEMBER, sha1($user_settings['passwd'] . $user_settings['passwordSalt']));

redirectexit('action=login2;sa=check;member=' . $ID_MEMBER, $context['server']['needs_login_fix']);
}
// Double check the cookie...
elseif (isset($_GET['sa']) && $_GET['sa'] == 'check')
{
// Strike! You're outta there!
if ($_GET['member'] != $ID_MEMBER)
fatal_lang_error('login_cookie_error', false);

// Some whitelisting for login_url...
if (empty($_SESSION['login_url']))
redirectexit();
else
{
// Best not to clutter the session data too much...
$temp = $_SESSION['login_url'];
unset($_SESSION['login_url']);

redirectexit($temp);
}
}

// Beyond this point you are assumed to be a guest trying to login.
if (!$user_info['is_guest'])
redirectexit();

// Set the login_url if it's not already set.
if (empty($_SESSION['login_url']) && isset($_SESSION['old_url']) && preg_match('~(board|topic)[=,]~', $_SESSION['old_url']) != 0)
$_SESSION['login_url'] = $_SESSION['old_url'];

// Are you guessing with a script that doesn't keep the session id?
spamProtection('login');

// Been guessing a lot, haven't we?
if (isset($_SESSION['failed_login']) && $_SESSION['failed_login'] >= $modSettings['failed_login_threshold'] * 3)
fatal_lang_error('login_threshold_fail');

// Set up the cookie length. (if it's invalid, just fall through and use the default.)
if (isset($_POST['cookieneverexp']) || (!empty($_POST['cookielength']) && $_POST['cookielength'] == -1))
$modSettings['cookieTime'] = 3153600;
elseif (!empty($_POST['cookielength']) && ($_POST['cookielength'] >= 1 || $_POST['cookielength'] <= 525600))
$modSettings['cookieTime'] = (int) $_POST['cookielength'];

// Set things up in case an error occurs.
if (!empty($maintenance) || empty($modSettings['allow_guestAccess']))
$context['sub_template'] = 'kick_guest';

loadLanguage('Login');
// Load the template stuff - wireless or normal.
if (WIRELESS)
$context['sub_template'] = WIRELESS_PROTOCOL . '_login';
else
{
loadTemplate('Login');
$context['sub_template'] = 'login';
}

// Set up the default/fallback stuff.
$context['default_username'] = isset($_REQUEST['user']) ? htmlspecialchars(stripslashes($_REQUEST['user'])) : '';
$context['default_password'] = '';
$context['never_expire'] = $modSettings['cookieTime'] == 525600 || $modSettings['cookieTime'] == 3153600;
$context['login_error'] = &$txt[106];
$context['page_title'] = $txt[34];

// You forgot to type your username, dummy!
if (!isset($_REQUEST['user']) || $_REQUEST['user'] == '')
{
$context['login_error'] = &$txt[37];
return;
}

// Hmm... maybe 'admin' will login with no password. Uhh... NO!
if ((!isset($_REQUEST['passwrd']) || $_REQUEST['passwrd'] == '') && (!isset($_REQUEST['hash_passwrd']) || strlen($_REQUEST['hash_passwrd']) != 40))
{
$context['login_error'] = &$txt[38];
return;
}

// No funky symbols either.
if (preg_match('~[<>&"\'=\\\]~', $_REQUEST['user']) != 0)
{
$context['login_error'] = &$txt[240];
return;
}

// Are we using any sort of integration to validate the login?
if (isset($modSettings['integrate_validate_login']) && function_exists($modSettings['integrate_validate_login']))
if (call_user_func($modSettings['integrate_validate_login'], $_REQUEST['user'], isset($_REQUEST['hash_passwrd']) && strlen($_REQUEST['hash_passwrd']) == 40 ? $_REQUEST['hash_passwrd'] : null, $modSettings['cookieTime']) == 'retry')
{
$context['login_error'] = $txt['login_hash_error'];
$context['disable_login_hashing'] = true;
return;
}

// Load the data up!
$request = db_query("
SELECT passwd, ID_MEMBER, ID_GROUP, lngfile, is_activated, emailAddress, additionalGroups, memberName, passwordSalt
FROM {$db_prefix}members
WHERE memberName = '$_REQUEST[user]'
LIMIT 1", __FILE__, __LINE__);
// Probably mistyped or their email, try it as an email address. (memberName first, though!)
if (mysql_num_rows($request) == 0)
{
mysql_free_result($request);

$request = db_query("
SELECT passwd, ID_MEMBER, ID_GROUP, lngfile, is_activated, emailAddress, additionalGroups, memberName, passwordSalt
FROM {$db_prefix}members
WHERE emailAddress = '$_REQUEST[user]'
LIMIT 1", __FILE__, __LINE__);
// Let them try again, it didn't match anything...
if (mysql_num_rows($request) == 0)
{
$context['login_error'] = &$txt[40];
return;
}
}

$user_settings = mysql_fetch_assoc($request);
mysql_free_result($request);

// What is the true activation status of this account?
$activation_status = $user_settings['is_activated'] > 10 ? $user_settings['is_activated'] - 10 : $user_settings['is_activated'];

// Check if the account is activated - COPPA first...
if ($activation_status == 5)
{
$context['login_error'] = $txt['coppa_not_completed1'] . ' <a href="' . $scripturl . '?action=coppa;member=' . $user_settings['ID_MEMBER'] . '">' . $txt['coppa_not_completed2'] . '</a>';
return;
}
// Awaiting approval still?
elseif ($activation_status == 3)
fatal_lang_error('still_awaiting_approval');
// Awaiting deletion, changed their mind?
elseif ($activation_status == 4)
{
// Display an error if we haven't decided to undelete.
if (!isset($_REQUEST['undelete']))
{
$context['login_error'] = $txt['awaiting_delete_account'];
$context['login_show_undelete'] = true;
return;
}
// Otherwise reactivate!
else
{
updateMemberData($user_settings['ID_MEMBER'], array('is_activated' => 1));
updateSettings(array('unapprovedMembers' => ($modSettings['unapprovedMembers'] > 0 ? $modSettings['unapprovedMembers'] - 1 : 0)));
}
}
// Standard activation?
elseif ($activation_status != 1)
{
log_error($txt['activate_not_completed1'] . ' - ' . $user_settings['memberName'] . '', false);

$context['login_error'] = $txt['activate_not_completed1'] . ' <a href="' . $scripturl . '?action=activate;sa=resend;u=' . $user_settings['ID_MEMBER'] . '">' . $txt['activate_not_completed2'] . '</a>';
return;
}

// Figure out the password using SMF's encryption - if what they typed is right.
if (isset($_REQUEST['hash_passwrd']) && strlen($_REQUEST['hash_passwrd']) == 40)
{
// Needs upgrading?
if (strlen($user_settings['passwd']) != 40)
{
$context['login_error'] = $txt['login_hash_error'];
$context['disable_login_hashing'] = true;
return;
}
// Challenge passed.
elseif ($_REQUEST['hash_passwrd'] == sha1($user_settings['passwd'] . $sc))
$sha_passwd = $user_settings['passwd'];
else
{
$_SESSION['failed_login'] = @$_SESSION['failed_login'] + 1;

if ($_SESSION['failed_login'] >= $modSettings['failed_login_threshold'])
redirectexit('action=reminder');
else
{
log_error($txt[39] . ' - ' . $user_settings['memberName'] . '');

$context['disable_login_hashing'] = true;
$context['login_error'] = $txt[39];
return;
}
}
}
else
$sha_passwd = sha1(strtolower($user_settings['memberName']) . un_htmlspecialchars(stripslashes($_REQUEST['passwrd'])));

// Bad password! Thought you could fool the database?!
if ($user_settings['passwd'] != $sha_passwd)
{
// Maybe we were too hasty... let's try some other authentication methods.
$other_passwords = array();

// None of the below cases will be used most of the time (because the salt is normally set.)
if ($user_settings['passwordSalt'] == '')
{
// YaBB SE, Discus, MD5 (used a lot), SHA-1 (used some), SMF 1.0.x, IkonBoard, and none at all.
$other_passwords[] = crypt($_REQUEST['passwrd'], substr($_REQUEST['passwrd'], 0, 2));
$other_passwords[] = crypt($_REQUEST['passwrd'], substr($user_settings['passwd'], 0, 2));
$other_passwords[] = md5($_REQUEST['passwrd']);
$other_passwords[] = sha1($_REQUEST['passwrd']);
$other_passwords[] = md5_hmac($_REQUEST['passwrd'], strtolower($user_settings['memberName']));
$other_passwords[] = md5($_REQUEST['passwrd'] . strtolower($user_settings['memberName']));
$other_passwords[] = $_REQUEST['passwrd'];

// This one is a strange one... MyPHP, crypt() on the MD5 hash.
$other_passwords[] = crypt(md5($_REQUEST['passwrd']), md5($_REQUEST['passwrd']));

// Snitz style - SHA-256. Technically, this is a downgrade, but most PHP configurations don't support sha256 anyway.
if (strlen($user_settings['passwd']) == 64 && function_exists('mhash') && defined('MHASH_SHA256'))
$other_passwords[] = bin2hex(mhash(MHASH_SHA256, $_REQUEST['passwrd']));
}
// The hash should be 40 if it's SHA-1, so we're safe with more here too.
elseif (strlen($user_settings['passwd']) == 32)
{
// vBulletin 3 style hashing? Let's welcome them with open arms \o/.
$other_passwords[] = md5(md5($_REQUEST['passwrd']) . $user_settings['passwordSalt']);
// Hmm.. p'raps it's Invision 2 style?
$other_passwords[] = md5(md5($user_settings['passwordSalt']) . md5($_REQUEST['passwrd']));
}

// Maybe they are using a hash from before the password fix.
$other_passwords[] = sha1(strtolower($user_settings['memberName']) . addslashes(un_htmlspecialchars(stripslashes($_REQUEST['passwrd']))));

// SMF's sha1 function can give a funny result on Linux (Not our fault!). If we've now got the real one let the old one be valid!
require_once($sourcedir . '/Subs-Compat.php');
$other_passwords[] = sha1_smf(strtolower($user_settings['memberName']) . un_htmlspecialchars(stripslashes($_REQUEST['passwrd'])));

// Whichever encryption it was using, let's make it use SMF's now ;).
if (in_array($user_settings['passwd'], $other_passwords))
{
$user_settings['passwd'] = $sha_passwd;
$user_settings['passwordSalt'] = substr(md5(rand()), 0, 4);

// Update the password and set up the hash.
updateMemberData($user_settings['ID_MEMBER'], array('passwd' => '\'' . $user_settings['passwd'] . '\'', 'passwordSalt' => '\'' . $user_settings['passwordSalt'] . '\''));
}
// Okay, they for sure didn't enter the password!
else
{
// They've messed up again - keep a count to see if they need a hand.
$_SESSION['failed_login'] = @$_SESSION['failed_login'] + 1;

// Hmm... don't remember it, do you? Here, try the password reminder ;).
if ($_SESSION['failed_login'] >= $modSettings['failed_login_threshold'])
redirectexit('action=reminder');
// We'll give you another chance...
else
{
// Log an error so we know that it didn't go well in the error log.
log_error($txt[39] . ' - ' . $user_settings['memberName'] . '');

$context['login_error'] = $txt[39];
return;
}
}
}
// Correct password, but they've got no salt; fix it!
elseif ($user_settings['passwordSalt'] == '')
{
$user_settings['passwordSalt'] = substr(md5(rand()), 0, 4);
updateMemberData($user_settings['ID_MEMBER'], array('passwordSalt' => '\'' . $user_settings['passwordSalt'] . '\''));
}

if (isset($modSettings['integrate_login']) && function_exists($modSettings['integrate_login']))
$modSettings['integrate_login']($user_settings['memberName'], isset($_REQUEST['hash_passwrd']) && strlen($_REQUEST['hash_passwrd']) == 40 ? $_REQUEST['hash_passwrd'] : null, $modSettings['cookieTime']);

// Get ready to set the cookie...
$username = $user_settings['memberName'];
$ID_MEMBER = $user_settings['ID_MEMBER'];

// Bam! Cookie set. A session too, just incase.
setLoginCookie(60 * $modSettings['cookieTime'], $user_settings['ID_MEMBER'], sha1($user_settings['passwd'] . $user_settings['passwordSalt']));

// Reset the login threshold.
if (isset($_SESSION['failed_login']))
unset($_SESSION['failed_login']);

$user_info['is_guest'] = false;
$user_settings['additionalGroups'] = explode(',', $user_settings['additionalGroups']);
$user_info['is_admin'] = $user_settings['ID_GROUP'] == 1 || in_array(1, $user_settings['additionalGroups']);

// Are you banned?
is_not_banned(true);

// An administrator, set up the login so they don't have to type it again.
if ($user_info['is_admin'])
{
$_SESSION['admin_time'] = time();
unset($_SESSION['just_registered']);
}

// Don't stick the language or theme after this point.
unset($_SESSION['language']);
unset($_SESSION['ID_THEME']);

// You've logged in, haven't you?
updateMemberData($ID_MEMBER, array('lastLogin' => time(), 'memberIP' => '\'' . $user_info['ip'] . '\'', 'memberIP2' => '\'' . $_SERVER['BAN_CHECK_IP'] . '\''));

// Get rid of the online entry for that old guest....
db_query("
DELETE FROM {$db_prefix}log_online
WHERE session = 'ip$user_info[ip]'
LIMIT 1", __FILE__, __LINE__);
$_SESSION['log_time'] = 0;

// Just log you back out if it's in maintenance mode and you AREN'T an admin.
if (empty($maintenance) || allowedTo('admin_forum'))
redirectexit('action=login2;sa=check;member=' . $ID_MEMBER, $context['server']['needs_login_fix']);
else
redirectexit('action=logout;sesc=' . $sc, $context['server']['needs_login_fix']);
}

// Log the user out.
function Logout($internal = false)
{
global $db_prefix, $sourcedir, $ID_MEMBER, $user_info, $user_settings, $context, $modSettings;

// Make sure they aren't being auto-logged out.
if (!$internal)
checkSession('get');

require_once($sourcedir . '/Subs-Auth.php');

if (isset($_SESSION['pack_ftp']))
$_SESSION['pack_ftp'] = null;

// Just ensure they aren't a guest!
if (!$user_info['is_guest'])
{
if (isset($modSettings['integrate_logout']) && function_exists($modSettings['integrate_logout']))
call_user_func($modSettings['integrate_logout'], $user_settings['memberName']);

// If you log out, you aren't online anymore :P.
db_query("
DELETE FROM {$db_prefix}log_online
WHERE ID_MEMBER = $ID_MEMBER
LIMIT 1", __FILE__, __LINE__);
}

$_SESSION['log_time'] = 0;

// Empty the cookie! (set it in the past, and for ID_MEMBER = 0)
setLoginCookie(-3600, 0);

// Off to the merry board index we go!
if (empty($_SESSION['logout_url']))
redirectexit('', $context['server']['needs_login_fix']);
else
{
$temp = $_SESSION['logout_url'];
unset($_SESSION['logout_url']);

redirectexit($temp, $context['server']['needs_login_fix']);
}
}

// MD5 Encryption used for older passwords.
function md5_hmac($data, $key)
{
$key = str_pad(strlen($key) <= 64 ? $key : pack('H*', md5($key)), 64, chr(0x00));
return md5(($key ^ str_repeat(chr(0x5c), 64)) . pack('H*', md5(($key ^ str_repeat(chr(0x36), 64)) . $data)));
}

?>