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Security.php
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Security.php
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<?php
/**
* @name ElkArte Forum
* @copyright ElkArte Forum contributors
* @license BSD http://opensource.org/licenses/BSD-3-Clause
*
* This software is a derived product, based on:
*
* Simple Machines Forum (SMF)
* copyright: 2011 Simple Machines (http://www.simplemachines.org)
* license: BSD, See included LICENSE.TXT for terms and conditions.
*
* @version 1.0 Alpha
*
* This file has the very important job of ensuring forum security.
* This task includes banning and permissions, namely.
*
*/
if (!defined('ELK'))
die('No access...');
/**
* Check if the user is who he/she says he is.
* This function makes sure the user is who they claim to be by requiring a password to be typed in every hour.
* This check can be turned on and off by the securityDisable setting.
* Uses the adminLogin() function of subs/Auth.subs.php if they need to login, which saves all request
* (POST and GET) data.
*
* @param string $type = admin
*/
function validateSession($type = 'admin')
{
global $modSettings, $user_info, $sc, $user_settings;
// Guests are not welcome here.
is_not_guest();
// Validate what type of session check this is.
$types = array();
call_integration_hook('integrate_validateSession', array(&$types));
$type = in_array($type, $types) || $type == 'moderate' ? $type : 'admin';
// If we're using XML give an additional ten minutes grace as an admin can't log on in XML mode.
$refreshTime = isset($_GET['xml']) ? 4200 : 3600;
// Is the security option off?
if (!empty($modSettings['securityDisable' . ($type != 'admin' ? '_' . $type : '')]))
return;
// If their admin or moderator session hasn't expired yet, let it pass.
if ((!empty($_SESSION[$type . '_time']) && $_SESSION[$type . '_time'] + $refreshTime >= time()) || (!empty($_SESSION['admin_time']) && $_SESSION['admin_time'] + $refreshTime >= time()))
return;
require_once(SUBSDIR . '/Auth.subs.php');
// Hashed password, ahoy!
if (isset($_POST[$type . '_hash_pass']) && strlen($_POST[$type . '_hash_pass']) == 40)
{
checkSession();
$good_password = in_array(true, call_integration_hook('integrate_verify_password', array($user_info['username'], $_POST[$type . '_hash_pass'], true)), true);
if ($good_password || $_POST[$type . '_hash_pass'] == sha1($user_info['passwd'] . $sc))
{
$_SESSION[$type . '_time'] = time();
unset($_SESSION['request_referer']);
return;
}
}
// Posting the password... check it.
if (isset($_POST[$type. '_pass']))
{
checkSession();
$good_password = in_array(true, call_integration_hook('integrate_verify_password', array($user_info['username'], $_POST[$type . '_pass'], false)), true);
// Password correct?
if ($good_password || sha1(strtolower($user_info['username']) . $_POST[$type . '_pass']) == $user_info['passwd'])
{
$_SESSION[$type . '_time'] = time();
unset($_SESSION['request_referer']);
return;
}
}
// OpenID?
if (!empty($user_settings['openid_uri']))
{
require_once(SUBSDIR . '/OpenID.subs.php');
openID_revalidate();
$_SESSION[$type . '_time'] = time();
unset($_SESSION['request_referer']);
return;
}
// Better be sure to remember the real referer
if (empty($_SESSION['request_referer']))
$_SESSION['request_referer'] = isset($_SERVER['HTTP_REFERER']) ? @parse_url($_SERVER['HTTP_REFERER']) : array();
elseif (empty($_POST))
unset($_SESSION['request_referer']);
// Need to type in a password for that, man.
if (!isset($_GET['xml']))
adminLogin($type);
else
return 'session_verify_fail';
}
/**
* Require a user who is logged in. (not a guest.)
* Checks if the user is currently a guest, and if so asks them to login with a message telling them why.
* Message is what to tell them when asking them to login.
*
* @param string $message = ''
*/
function is_not_guest($message = '', $is_fatal = true)
{
global $user_info, $txt, $context, $scripturl;
// Luckily, this person isn't a guest.
if (isset($user_info['is_guest']) && !$user_info['is_guest'])
return true;
// People always worry when they see people doing things they aren't actually doing...
$_GET['action'] = '';
$_GET['board'] = '';
$_GET['topic'] = '';
writeLog(true);
// Just die.
if (isset($_REQUEST['xml']) || !$is_fatal)
obExit(false);
// Attempt to detect if they came from dlattach.
if (ELK != 'SSI' && empty($context['theme_loaded']))
loadTheme();
// Never redirect to an attachment
if (strpos($_SERVER['REQUEST_URL'], 'dlattach') === false)
$_SESSION['login_url'] = $_SERVER['REQUEST_URL'];
// Load the Login template and language file.
loadLanguage('Login');
// Apparently we're not in a position to handle this now. Let's go to a safer location for now.
if (!Template_Layers::getInstance()->hasLayers())
{
$_SESSION['login_url'] = $scripturl . '?' . $_SERVER['QUERY_STRING'];
redirectexit('action=login');
}
elseif (isset($_GET['api']))
return false;
else
{
loadTemplate('Login');
$context['sub_template'] = 'kick_guest';
$context['robot_no_index'] = true;
}
// Use the kick_guest sub template...
$context['kick_message'] = $message;
$context['page_title'] = $txt['login'];
obExit();
// We should never get to this point, but if we did we wouldn't know the user isn't a guest.
trigger_error('Hacking attempt...', E_USER_ERROR);
}
/**
* Apply restrictions for banned users. For example, disallow access.
* If he user is banned, it dies with an error.
* Caches this information for optimization purposes.
* Forces a recheck if force_check is true.
*
* @param bool $forceCheck = false
*/
function is_not_banned($forceCheck = false)
{
global $txt, $modSettings, $context, $user_info;
global $cookiename, $user_settings;
$db = database();
// You cannot be banned if you are an admin - doesn't help if you log out.
if ($user_info['is_admin'])
return;
// Only check the ban every so often. (to reduce load.)
if ($forceCheck || !isset($_SESSION['ban']) || empty($modSettings['banLastUpdated']) || ($_SESSION['ban']['last_checked'] < $modSettings['banLastUpdated']) || $_SESSION['ban']['id_member'] != $user_info['id'] || $_SESSION['ban']['ip'] != $user_info['ip'] || $_SESSION['ban']['ip2'] != $user_info['ip2'] || (isset($user_info['email'], $_SESSION['ban']['email']) && $_SESSION['ban']['email'] != $user_info['email']))
{
// Innocent until proven guilty. (but we know you are! :P)
$_SESSION['ban'] = array(
'last_checked' => time(),
'id_member' => $user_info['id'],
'ip' => $user_info['ip'],
'ip2' => $user_info['ip2'],
'email' => $user_info['email'],
);
$ban_query = array();
$ban_query_vars = array('current_time' => time());
$flag_is_activated = false;
// Check both IP addresses.
foreach (array('ip', 'ip2') as $ip_number)
{
if ($ip_number == 'ip2' && $user_info['ip2'] == $user_info['ip'])
continue;
$ban_query[] = constructBanQueryIP($user_info[$ip_number]);
// IP was valid, maybe there's also a hostname...
if (empty($modSettings['disableHostnameLookup']) && $user_info[$ip_number] != 'unknown')
{
$hostname = host_from_ip($user_info[$ip_number]);
if (strlen($hostname) > 0)
{
$ban_query[] = '({string:hostname} LIKE bi.hostname)';
$ban_query_vars['hostname'] = $hostname;
}
}
}
// Is their email address banned?
if (strlen($user_info['email']) != 0)
{
$ban_query[] = '({string:email} LIKE bi.email_address)';
$ban_query_vars['email'] = $user_info['email'];
}
// How about this user?
if (!$user_info['is_guest'] && !empty($user_info['id']))
{
$ban_query[] = 'bi.id_member = {int:id_member}';
$ban_query_vars['id_member'] = $user_info['id'];
}
// Check the ban, if there's information.
if (!empty($ban_query))
{
$restrictions = array(
'cannot_access',
'cannot_login',
'cannot_post',
'cannot_register',
);
$request = $db->query('', '
SELECT bi.id_ban, bi.email_address, bi.id_member, bg.cannot_access, bg.cannot_register,
bg.cannot_post, bg.cannot_login, bg.reason, IFNULL(bg.expire_time, 0) AS expire_time
FROM {db_prefix}ban_items AS bi
INNER JOIN {db_prefix}ban_groups AS bg ON (bg.id_ban_group = bi.id_ban_group AND (bg.expire_time IS NULL OR bg.expire_time > {int:current_time}))
WHERE
(' . implode(' OR ', $ban_query) . ')',
$ban_query_vars
);
// Store every type of ban that applies to you in your session.
while ($row = $db->fetch_assoc($request))
{
foreach ($restrictions as $restriction)
if (!empty($row[$restriction]))
{
$_SESSION['ban'][$restriction]['reason'] = $row['reason'];
$_SESSION['ban'][$restriction]['ids'][] = $row['id_ban'];
if (!isset($_SESSION['ban']['expire_time']) || ($_SESSION['ban']['expire_time'] != 0 && ($row['expire_time'] == 0 || $row['expire_time'] > $_SESSION['ban']['expire_time'])))
$_SESSION['ban']['expire_time'] = $row['expire_time'];
if (!$user_info['is_guest'] && $restriction == 'cannot_access' && ($row['id_member'] == $user_info['id'] || $row['email_address'] == $user_info['email']))
$flag_is_activated = true;
}
}
$db->free_result($request);
}
// Mark the cannot_access and cannot_post bans as being 'hit'.
if (isset($_SESSION['ban']['cannot_access']) || isset($_SESSION['ban']['cannot_post']) || isset($_SESSION['ban']['cannot_login']))
log_ban(array_merge(isset($_SESSION['ban']['cannot_access']) ? $_SESSION['ban']['cannot_access']['ids'] : array(), isset($_SESSION['ban']['cannot_post']) ? $_SESSION['ban']['cannot_post']['ids'] : array(), isset($_SESSION['ban']['cannot_login']) ? $_SESSION['ban']['cannot_login']['ids'] : array()));
// If for whatever reason the is_activated flag seems wrong, do a little work to clear it up.
if ($user_info['id'] && (($user_settings['is_activated'] >= 10 && !$flag_is_activated)
|| ($user_settings['is_activated'] < 10 && $flag_is_activated)))
{
require_once(SUBSDIR . '/Bans.subs.php');
updateBanMembers();
}
}
// Hey, I know you! You're ehm...
if (!isset($_SESSION['ban']['cannot_access']) && !empty($_COOKIE[$cookiename . '_']))
{
$bans = explode(',', $_COOKIE[$cookiename . '_']);
foreach ($bans as $key => $value)
$bans[$key] = (int) $value;
$request = $db->query('', '
SELECT bi.id_ban, bg.reason
FROM {db_prefix}ban_items AS bi
INNER JOIN {db_prefix}ban_groups AS bg ON (bg.id_ban_group = bi.id_ban_group)
WHERE bi.id_ban IN ({array_int:ban_list})
AND (bg.expire_time IS NULL OR bg.expire_time > {int:current_time})
AND bg.cannot_access = {int:cannot_access}
LIMIT ' . count($bans),
array(
'cannot_access' => 1,
'ban_list' => $bans,
'current_time' => time(),
)
);
while ($row = $db->fetch_assoc($request))
{
$_SESSION['ban']['cannot_access']['ids'][] = $row['id_ban'];
$_SESSION['ban']['cannot_access']['reason'] = $row['reason'];
}
$db->free_result($request);
// My mistake. Next time better.
if (!isset($_SESSION['ban']['cannot_access']))
{
require_once(SUBSDIR . '/Auth.subs.php');
$cookie_url = url_parts(!empty($modSettings['localCookies']), !empty($modSettings['globalCookies']));
elk_setcookie($cookiename . '_', '', time() - 3600, $cookie_url[1], $cookie_url[0], false, false);
}
}
// If you're fully banned, it's end of the story for you.
if (isset($_SESSION['ban']['cannot_access']))
{
require_once(SUBSDIR . '/Auth.subs.php');
// We don't wanna see you!
if (!$user_info['is_guest'])
logOnline($user_info['id'], false);
// 'Log' the user out. Can't have any funny business... (save the name!)
$old_name = isset($user_info['name']) && $user_info['name'] != '' ? $user_info['name'] : $txt['guest_title'];
$user_info['name'] = '';
$user_info['username'] = '';
$user_info['is_guest'] = true;
$user_info['is_admin'] = false;
$user_info['permissions'] = array();
$user_info['id'] = 0;
$context['user'] = array(
'id' => 0,
'username' => '',
'name' => $txt['guest_title'],
'is_guest' => true,
'is_logged' => false,
'is_admin' => false,
'is_mod' => false,
'can_mod' => false,
'language' => $user_info['language'],
);
// A goodbye present.
$cookie_url = url_parts(!empty($modSettings['localCookies']), !empty($modSettings['globalCookies']));
elk_setcookie($cookiename . '_', implode(',', $_SESSION['ban']['cannot_access']['ids']), time() + 3153600, $cookie_url[1], $cookie_url[0], false, false);
// Don't scare anyone, now.
$_GET['action'] = '';
$_GET['board'] = '';
$_GET['topic'] = '';
writeLog(true);
// You banned, sucka!
fatal_error(sprintf($txt['your_ban'], $old_name) . (empty($_SESSION['ban']['cannot_access']['reason']) ? '' : '<br />' . $_SESSION['ban']['cannot_access']['reason']) . '<br />' . (!empty($_SESSION['ban']['expire_time']) ? sprintf($txt['your_ban_expires'], standardTime($_SESSION['ban']['expire_time'], false)) : $txt['your_ban_expires_never']), 'user');
// If we get here, something's gone wrong.... but let's try anyway.
trigger_error('Hacking attempt...', E_USER_ERROR);
}
// You're not allowed to log in but yet you are. Let's fix that.
elseif (isset($_SESSION['ban']['cannot_login']) && !$user_info['is_guest'])
{
// We don't wanna see you!
$db->query('', '
DELETE FROM {db_prefix}log_online
WHERE id_member = {int:current_member}',
array(
'current_member' => $user_info['id'],
)
);
// 'Log' the user out. Can't have any funny business... (save the name!)
$old_name = isset($user_info['name']) && $user_info['name'] != '' ? $user_info['name'] : $txt['guest_title'];
$user_info['name'] = '';
$user_info['username'] = '';
$user_info['is_guest'] = true;
$user_info['is_admin'] = false;
$user_info['permissions'] = array();
$user_info['id'] = 0;
$context['user'] = array(
'id' => 0,
'username' => '',
'name' => $txt['guest_title'],
'is_guest' => true,
'is_logged' => false,
'is_admin' => false,
'is_mod' => false,
'can_mod' => false,
'language' => $user_info['language'],
);
// Wipe 'n Clean(r) erases all traces.
$_GET['action'] = '';
$_GET['board'] = '';
$_GET['topic'] = '';
writeLog(true);
require_once(CONTROLLERDIR . '/Auth.controller.php');
$controller = new Auth_Controller();
$controller->action_logout(true, false);
fatal_error(sprintf($txt['your_ban'], $old_name) . (empty($_SESSION['ban']['cannot_login']['reason']) ? '' : '<br />' . $_SESSION['ban']['cannot_login']['reason']) . '<br />' . (!empty($_SESSION['ban']['expire_time']) ? sprintf($txt['your_ban_expires'], standardTime($_SESSION['ban']['expire_time'], false)) : $txt['your_ban_expires_never']) . '<br />' . $txt['ban_continue_browse'], 'user');
}
// Fix up the banning permissions.
if (isset($user_info['permissions']))
banPermissions();
}
/**
* Fix permissions according to ban status.
* Applies any states of banning by removing permissions the user cannot have.
*/
function banPermissions()
{
global $user_info, $modSettings, $context;
// Somehow they got here, at least take away all permissions...
if (isset($_SESSION['ban']['cannot_access']))
$user_info['permissions'] = array();
// Okay, well, you can watch, but don't touch a thing.
elseif (isset($_SESSION['ban']['cannot_post']) || (!empty($modSettings['warning_mute']) && $modSettings['warning_mute'] <= $user_info['warning']))
{
$denied_permissions = array(
'pm_send',
'calendar_post', 'calendar_edit_own', 'calendar_edit_any',
'poll_post',
'poll_add_own', 'poll_add_any',
'poll_edit_own', 'poll_edit_any',
'poll_lock_own', 'poll_lock_any',
'poll_remove_own', 'poll_remove_any',
'manage_attachments', 'manage_smileys', 'manage_boards', 'admin_forum', 'manage_permissions',
'moderate_forum', 'manage_membergroups', 'manage_bans', 'send_mail', 'edit_news',
'profile_identity_any', 'profile_extra_any', 'profile_title_any',
'post_new', 'post_reply_own', 'post_reply_any',
'delete_own', 'delete_any', 'delete_replies',
'make_sticky',
'merge_any', 'split_any',
'modify_own', 'modify_any', 'modify_replies',
'move_any',
'send_topic',
'lock_own', 'lock_any',
'remove_own', 'remove_any',
'post_unapproved_topics', 'post_unapproved_replies_own', 'post_unapproved_replies_any',
);
call_integration_hook('integrate_post_ban_permissions', array(&$denied_permissions));
$user_info['permissions'] = array_diff($user_info['permissions'], $denied_permissions);
}
// Are they absolutely under moderation?
elseif (!empty($modSettings['warning_moderate']) && $modSettings['warning_moderate'] <= $user_info['warning'])
{
// Work out what permissions should change...
$permission_change = array(
'post_new' => 'post_unapproved_topics',
'post_reply_own' => 'post_unapproved_replies_own',
'post_reply_any' => 'post_unapproved_replies_any',
'post_attachment' => 'post_unapproved_attachments',
);
call_integration_hook('integrate_warn_permissions', array(&$permission_change));
foreach ($permission_change as $old => $new)
{
if (!in_array($old, $user_info['permissions']))
unset($permission_change[$old]);
else
$user_info['permissions'][] = $new;
}
$user_info['permissions'] = array_diff($user_info['permissions'], array_keys($permission_change));
}
// @todo Find a better place to call this? Needs to be after permissions loaded!
// Finally, some bits we cache in the session because it saves queries.
if (isset($_SESSION['mc']) && $_SESSION['mc']['time'] > $modSettings['settings_updated'] && $_SESSION['mc']['id'] == $user_info['id'])
$user_info['mod_cache'] = $_SESSION['mc'];
else
{
require_once(SUBSDIR . '/Auth.subs.php');
rebuildModCache();
}
// Now that we have the mod cache taken care of lets setup a cache for the number of mod reports still open
if (isset($_SESSION['rc']) && $_SESSION['rc']['time'] > $modSettings['last_mod_report_action'] && $_SESSION['rc']['id'] == $user_info['id'])
$context['open_mod_reports'] = $_SESSION['rc']['reports'];
elseif ($_SESSION['mc']['bq'] != '0=1')
{
require_once(SUBSDIR . '/Moderation.subs.php');
recountOpenReports();
}
else
$context['open_mod_reports'] = 0;
}
/**
* Log a ban in the database.
* Log the current user in the ban logs.
* Increment the hit counters for the specified ban ID's (if any.)
*
* @param array $ban_ids = array()
* @param string $email = null
*/
function log_ban($ban_ids = array(), $email = null)
{
global $user_info;
$db = database();
// Don't log web accelerators, it's very confusing...
if (isset($_SERVER['HTTP_X_MOZ']) && $_SERVER['HTTP_X_MOZ'] == 'prefetch')
return;
$db->insert('',
'{db_prefix}log_banned',
array('id_member' => 'int', 'ip' => 'string-16', 'email' => 'string', 'log_time' => 'int'),
array($user_info['id'], $user_info['ip'], ($email === null ? ($user_info['is_guest'] ? '' : $user_info['email']) : $email), time()),
array('id_ban_log')
);
// One extra point for these bans.
if (!empty($ban_ids))
$db->query('', '
UPDATE {db_prefix}ban_items
SET hits = hits + 1
WHERE id_ban IN ({array_int:ban_ids})',
array(
'ban_ids' => $ban_ids,
)
);
}
/**
* Checks if a given email address might be banned.
* Check if a given email is banned.
* Performs an immediate ban if the turns turns out positive.
*
* @param string $email
* @param string $restriction
* @param string $error
*/
function isBannedEmail($email, $restriction, $error)
{
global $txt;
$db = database();
// Can't ban an empty email
if (empty($email) || trim($email) == '')
return;
// Let's start with the bans based on your IP/hostname/memberID...
$ban_ids = isset($_SESSION['ban'][$restriction]) ? $_SESSION['ban'][$restriction]['ids'] : array();
$ban_reason = isset($_SESSION['ban'][$restriction]) ? $_SESSION['ban'][$restriction]['reason'] : '';
// ...and add to that the email address you're trying to register.
$request = $db->query('', '
SELECT bi.id_ban, bg.' . $restriction . ', bg.cannot_access, bg.reason
FROM {db_prefix}ban_items AS bi
INNER JOIN {db_prefix}ban_groups AS bg ON (bg.id_ban_group = bi.id_ban_group)
WHERE {string:email} LIKE bi.email_address
AND (bg.' . $restriction . ' = {int:cannot_access} OR bg.cannot_access = {int:cannot_access})
AND (bg.expire_time IS NULL OR bg.expire_time >= {int:now})',
array(
'email' => $email,
'cannot_access' => 1,
'now' => time(),
)
);
while ($row = $db->fetch_assoc($request))
{
if (!empty($row['cannot_access']))
{
$_SESSION['ban']['cannot_access']['ids'][] = $row['id_ban'];
$_SESSION['ban']['cannot_access']['reason'] = $row['reason'];
}
if (!empty($row[$restriction]))
{
$ban_ids[] = $row['id_ban'];
$ban_reason = $row['reason'];
}
}
$db->free_result($request);
// You're in biiig trouble. Banned for the rest of this session!
if (isset($_SESSION['ban']['cannot_access']))
{
log_ban($_SESSION['ban']['cannot_access']['ids']);
$_SESSION['ban']['last_checked'] = time();
fatal_error(sprintf($txt['your_ban'], $txt['guest_title']) . $_SESSION['ban']['cannot_access']['reason'], false);
}
if (!empty($ban_ids))
{
// Log this ban for future reference.
log_ban($ban_ids, $email);
fatal_error($error . $ban_reason, false);
}
}
/**
* Make sure the user's correct session was passed, and they came from here.
* Checks the current session, verifying that the person is who he or she should be.
* Also checks the referrer to make sure they didn't get sent here.
* Depends on the disableCheckUA setting, which is usually missing.
* Will check GET, POST, or REQUEST depending on the passed type.
* Also optionally checks the referring action if passed. (note that the referring action must be by GET.)
*
* @param string $type = 'post' (post, get, request)
* @param string $from_action = ''
* @param bool $is_fatal = true
* @return string the error message if is_fatal is false.
*/
function checkSession($type = 'post', $from_action = '', $is_fatal = true)
{
global $sc, $modSettings, $boardurl;
// We'll work out user agent checks
$req = request();
// Is it in as $_POST['sc']?
if ($type == 'post')
{
$check = isset($_POST[$_SESSION['session_var']]) ? $_POST[$_SESSION['session_var']] : (empty($modSettings['strictSessionCheck']) && isset($_POST['sc']) ? $_POST['sc'] : null);
if ($check !== $sc)
$error = 'session_timeout';
}
// How about $_GET['sesc']?
elseif ($type === 'get')
{
$check = isset($_GET[$_SESSION['session_var']]) ? $_GET[$_SESSION['session_var']] : (empty($modSettings['strictSessionCheck']) && isset($_GET['sesc']) ? $_GET['sesc'] : null);
if ($check !== $sc)
$error = 'session_verify_fail';
}
// Or can it be in either?
elseif ($type == 'request')
{
$check = isset($_GET[$_SESSION['session_var']]) ? $_GET[$_SESSION['session_var']] : (empty($modSettings['strictSessionCheck']) && isset($_GET['sesc']) ? $_GET['sesc'] : (isset($_POST[$_SESSION['session_var']]) ? $_POST[$_SESSION['session_var']] : (empty($modSettings['strictSessionCheck']) && isset($_POST['sc']) ? $_POST['sc'] : null)));
if ($check !== $sc)
$error = 'session_verify_fail';
}
// Verify that they aren't changing user agents on us - that could be bad.
if ((!isset($_SESSION['USER_AGENT']) || $_SESSION['USER_AGENT'] != $req->user_agent()) && empty($modSettings['disableCheckUA']))
$error = 'session_verify_fail';
// Make sure a page with session check requirement is not being prefetched.
if (isset($_SERVER['HTTP_X_MOZ']) && $_SERVER['HTTP_X_MOZ'] == 'prefetch')
{
ob_end_clean();
header('HTTP/1.1 403 Forbidden');
die;
}
// Check the referring site - it should be the same server at least!
if (isset($_SESSION['request_referer']))
$referrer = $_SESSION['request_referer'];
else
$referrer = isset($_SERVER['HTTP_REFERER']) ? @parse_url($_SERVER['HTTP_REFERER']) : array();
if (!empty($referrer['host']))
{
if (strpos($_SERVER['HTTP_HOST'], ':') !== false)
$real_host = substr($_SERVER['HTTP_HOST'], 0, strpos($_SERVER['HTTP_HOST'], ':'));
else
$real_host = $_SERVER['HTTP_HOST'];
$parsed_url = parse_url($boardurl);
// Are global cookies on? If so, let's check them ;).
if (!empty($modSettings['globalCookies']))
{
if (preg_match('~(?:[^\.]+\.)?([^\.]{3,}\..+)\z~i', $parsed_url['host'], $parts) == 1)
$parsed_url['host'] = $parts[1];
if (preg_match('~(?:[^\.]+\.)?([^\.]{3,}\..+)\z~i', $referrer['host'], $parts) == 1)
$referrer['host'] = $parts[1];
if (preg_match('~(?:[^\.]+\.)?([^\.]{3,}\..+)\z~i', $real_host, $parts) == 1)
$real_host = $parts[1];
}
// Okay: referrer must either match parsed_url or real_host.
if (isset($parsed_url['host']) && strtolower($referrer['host']) != strtolower($parsed_url['host']) && strtolower($referrer['host']) != strtolower($real_host))
{
$error = 'verify_url_fail';
$log_error = true;
}
}
// Well, first of all, if a from_action is specified you'd better have an old_url.
if (!empty($from_action) && (!isset($_SESSION['old_url']) || preg_match('~[?;&]action=' . $from_action . '([;&]|$)~', $_SESSION['old_url']) == 0))
{
$error = 'verify_url_fail';
$log_error = true;
}
if (strtolower($req->user_agent()) == 'hacker')
fatal_error('Sound the alarm! It\'s a hacker! Close the castle gates!!', false);
// Everything is ok, return an empty string.
if (!isset($error))
return '';
// A session error occurred, show the error.
elseif ($is_fatal)
{
if (isset($_GET['xml']) || isset($_REQUEST['api']))
{
ob_end_clean();
header('HTTP/1.1 403 Forbidden - Session timeout');
die;
}
else
fatal_lang_error($error, isset($log_error) ? 'user' : false);
}
// A session error occurred, return the error to the calling function.
else
return $error;
// We really should never fall through here, for very important reasons. Let's make sure.
trigger_error('Hacking attempt...', E_USER_ERROR);
}
/**
* Check if a specific confirm parameter was given.
*
* @param string $action
*/
function checkConfirm($action)
{
global $modSettings;
$req = request();
if (isset($_GET['confirm']) && isset($_SESSION['confirm_' . $action]) && md5($_GET['confirm'] . $req->user_agent()) === $_SESSION['confirm_' . $action])
return true;
else
{
$token = md5(mt_rand() . session_id() . (string) microtime() . $modSettings['rand_seed']);
$_SESSION['confirm_' . $action] = md5($token . $req->user_agent());
return $token;
}
}
/**
* Lets give you a token of our appreciation.
*
* @param string $action
* @param string $type = 'post'
* @return array
*/
function createToken($action, $type = 'post')
{
global $modSettings, $context;
// we need user agent
$req = request();
$token = md5(mt_rand() . session_id() . (string) microtime() . $modSettings['rand_seed'] . $type);
$token_var = substr(preg_replace('~^\d+~', '', md5(mt_rand() . (string) microtime() . mt_rand())), 0, rand(7, 12));
$_SESSION['token'][$type . '-' . $action] = array($token_var, md5($token . $req->user_agent()), time(), $token);
$context[$action . '_token'] = $token;
$context[$action . '_token_var'] = $token_var;
return array($action . '_token_var' => $token_var, $action . '_token' => $token);
}
/**
* Only patrons with valid tokens can ride this ride.
*
* @param string $action
* @param string $type = 'post' (get, request, or post)
* @param bool $reset = true
* @return boolean
*/
function validateToken($action, $type = 'post', $reset = true)
{
$type = $type == 'get' || $type == 'request' ? $type : 'post';
// Logins are special: the token is used to has the password with javascript before POST it
if ($action == 'login')
{
if (isset($_SESSION['token'][$type . '-' . $action]))
{
$return = $_SESSION['token'][$type . '-' . $action][3];
unset($_SESSION['token'][$type . '-' . $action]);
return $return;
}
else
return '';
}
// This nasty piece of code validates a token.
// 1. The token exists in session.
// 2. The {$type} variable should exist.
// 3. We concat the variable we received with the user agent
// 4. Match that result against what is in the session.
// 5. If it matchs, success, otherwise we fallout.
// we use user agent
$req = request();
if (isset($_SESSION['token'][$type . '-' . $action], $GLOBALS['_' . strtoupper($type)][$_SESSION['token'][$type . '-' . $action][0]]) && md5($GLOBALS['_' . strtoupper($type)][$_SESSION['token'][$type . '-' . $action][0]] . $req->user_agent()) === $_SESSION['token'][$type . '-' . $action][1])
{
// Invalidate this token now.
unset($_SESSION['token'][$type . '-' . $action]);
return true;
}
// Patrons with invalid tokens get the boot.
if ($reset)
{
// Might as well do some cleanup on this.
cleanTokens();
// I'm back baby.
createToken($action, $type);
fatal_lang_error('token_verify_fail', false);
}
// Remove this token as its useless
else
unset($_SESSION['token'][$type . '-' . $action]);
// Randomly check if we should remove some older tokens.
if (mt_rand(0, 138) == 23)
cleanTokens();
return false;
}
/**
* Removes old unused tokens from session
* defaults to 3 hours before a token is considered expired
* if $complete = true will remove all tokens
*
* @param bool $complete = false
*/
function cleanTokens($complete = false)
{
// We appreciate cleaning up after yourselves.
if (!isset($_SESSION['token']))
return;
// Clean up tokens, trying to give enough time still.
foreach ($_SESSION['token'] as $key => $data)
if ($data[2] + 10800 < time() || $complete)
unset($_SESSION['token'][$key]);
}
/**
* Check whether a form has been submitted twice.
* Registers a sequence number for a form.
* Checks whether a submitted sequence number is registered in the current session.
* Depending on the value of is_fatal shows an error or returns true or false.
* Frees a sequence number from the stack after it's been checked.
* Frees a sequence number without checking if action == 'free'.
*
* @param string $action
* @param bool $is_fatal = true
* @return boolean
*/
function checkSubmitOnce($action, $is_fatal = true)
{
global $context;
if (!isset($_SESSION['forms']))
$_SESSION['forms'] = array();
// Register a form number and store it in the session stack. (use this on the page that has the form.)
if ($action == 'register')
{
$context['form_sequence_number'] = 0;
while (empty($context['form_sequence_number']) || in_array($context['form_sequence_number'], $_SESSION['forms']))
$context['form_sequence_number'] = mt_rand(1, 16000000);
}
// Check whether the submitted number can be found in the session.
elseif ($action == 'check')
{
if (!isset($_REQUEST['seqnum']))
return true;
elseif (!in_array($_REQUEST['seqnum'], $_SESSION['forms']))
{
$_SESSION['forms'][] = (int) $_REQUEST['seqnum'];
return true;
}
elseif ($is_fatal)
fatal_lang_error('error_form_already_submitted', false);
else
return false;
}
// Don't check, just free the stack number.
elseif ($action == 'free' && isset($_REQUEST['seqnum']) && in_array($_REQUEST['seqnum'], $_SESSION['forms']))
$_SESSION['forms'] = array_diff($_SESSION['forms'], array($_REQUEST['seqnum']));
elseif ($action != 'free')
trigger_error('checkSubmitOnce(): Invalid action \'' . $action . '\'', E_USER_WARNING);
}
/**
* This function checks whether the user is allowed to do permission. (ie. post_new.)
* If boards parameter is specified, checks those boards instead of the current one (if applicable).
* Always returns true if the user is an administrator.
*
* @param string $permission permission
* @param array $boards = null array of board IDs
* @return boolean if the user can do the permission
*/
function allowedTo($permission, $boards = null)
{
global $user_info;
$db = database();
// You're always allowed to do nothing. (unless you're a working man, MR. LAZY :P!)
if (empty($permission))
return true;
// You're never allowed to do something if your data hasn't been loaded yet!
if (empty($user_info))
return false;
// Administrators are supermen :P.
if ($user_info['is_admin'])
return true;
// Are we checking the _current_ board, or some other boards?
if ($boards === null)
{
// Check if they can do it.
if (!is_array($permission) && in_array($permission, $user_info['permissions']))
return true;
// Search for any of a list of permissions.
elseif (is_array($permission) && count(array_intersect($permission, $user_info['permissions'])) != 0)
return true;
// You aren't allowed, by default.
else
return false;
}
elseif (!is_array($boards))
$boards = array($boards);
$request = $db->query('', '
SELECT MIN(bp.add_deny) AS add_deny
FROM {db_prefix}boards AS b
INNER JOIN {db_prefix}board_permissions AS bp ON (bp.id_profile = b.id_profile)
LEFT JOIN {db_prefix}moderators AS mods ON (mods.id_board = b.id_board AND mods.id_member = {int:current_member})
WHERE b.id_board IN ({array_int:board_list})
AND bp.id_group IN ({array_int:group_list}, {int:moderator_group})
AND bp.permission {raw:permission_list}
AND (mods.id_member IS NOT NULL OR bp.id_group != {int:moderator_group})
GROUP BY b.id_board',
array(
'current_member' => $user_info['id'],
'board_list' => $boards,
'group_list' => $user_info['groups'],
'moderator_group' => 3,
'permission_list' => (is_array($permission) ? 'IN (\'' . implode('\', \'', $permission) . '\')' : ' = \'' . $permission . '\''),
)
);
// Make sure they can do it on all of the boards.
if ($db->num_rows($request) != count($boards))
return false;
$result = true;
while ($row = $db->fetch_assoc($request))
$result &= !empty($row['add_deny']);
$db->free_result($request);
// If the query returned 1, they can do it... otherwise, they can't.
return $result;
}
/**
* This function returns fatal error if the user doesn't have the respective permission.
* Uses allowedTo() to check if the user is allowed to do permission.
* Checks the passed boards or current board for the permission.
* If they are not, it loads the Errors language file and shows an error using $txt['cannot_' . $permission].
* If they are a guest and cannot do it, this calls is_not_guest().
*
* @param string $permission
* @param array $boards = null
*/
function isAllowedTo($permission, $boards = null)
{
global $user_info, $txt;