501 lines
No EOL
20 KiB
PHP
501 lines
No EOL
20 KiB
PHP
<?php
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/**
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* Simple Machines Forum (SMF)
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*
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* @package SMF
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* @author Simple Machines http://www.simplemachines.org
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* @copyright 2011 Simple Machines
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* @license http://www.simplemachines.org/about/smf/license.php BSD
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*
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* @version 2.0.9
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*/
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if (!defined('SMF'))
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die('Hacking attempt...');
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/* This file does a lot of important stuff. Mainly, this means it handles
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the query string, request variables, and session management. It contains
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the following functions:
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void cleanRequest()
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- cleans the request variables (ENV, GET, POST, COOKIE, SERVER) and
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makes sure the query string was parsed correctly.
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- handles the URLs passed by the queryless URLs option.
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- makes sure, regardless of php.ini, everything has slashes.
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- sets up $board, $topic, and $scripturl and $_REQUEST['start'].
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- determines, or rather tries to determine, the client's IP.
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array escapestring__recursive(array var)
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- returns the var, as an array or string, with escapes as required.
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- importantly escapes all keys and values!
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- calls itself recursively if necessary.
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array htmlspecialchars__recursive(array var)
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- adds entities (", <, >) to the array or string var.
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- importantly, does not effect keys, only values.
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- calls itself recursively if necessary.
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array urldecode__recursive(array var)
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- takes off url encoding (%20, etc.) from the array or string var.
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- importantly, does it to keys too!
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- calls itself recursively if there are any sub arrays.
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array unescapestring__recursive(array var)
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- unescapes, recursively, from the array or string var.
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- effects both keys and values of arrays.
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- calls itself recursively to handle arrays of arrays.
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array stripslashes__recursive(array var)
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- removes slashes, recursively, from the array or string var.
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- effects both keys and values of arrays.
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- calls itself recursively to handle arrays of arrays.
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array htmltrim__recursive(array var)
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- trims a string or an the var array using html characters as well.
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- does not effect keys, only values.
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- may call itself recursively if needed.
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string cleanXml(string var)
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- removes invalid XML characters to assure the input string being
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parsed properly.
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string ob_sessrewrite(string buffer)
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- rewrites the URLs outputted to have the session ID, if the user
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is not accepting cookies and is using a standard web browser.
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- handles rewriting URLs for the queryless URLs option.
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- can be turned off entirely by setting $scripturl to an empty
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string, ''. (it wouldn't work well like that anyway.)
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- because of bugs in certain builds of PHP, does not function in
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versions lower than 4.3.0 - please upgrade if this hurts you.
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*/
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// Clean the request variables - add html entities to GET and slashes if magic_quotes_gpc is Off.
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function cleanRequest()
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{
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global $board, $topic, $boardurl, $scripturl, $modSettings, $smcFunc;
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// Makes it easier to refer to things this way.
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$scripturl = $boardurl . '/index.php';
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// What function to use to reverse magic quotes - if sybase is on we assume that the database sensibly has the right unescape function!
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$removeMagicQuoteFunction = @ini_get('magic_quotes_sybase') || strtolower(@ini_get('magic_quotes_sybase')) == 'on' ? 'unescapestring__recursive' : 'stripslashes__recursive';
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// Save some memory.. (since we don't use these anyway.)
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unset($GLOBALS['HTTP_POST_VARS'], $GLOBALS['HTTP_POST_VARS']);
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unset($GLOBALS['HTTP_POST_FILES'], $GLOBALS['HTTP_POST_FILES']);
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// These keys shouldn't be set...ever.
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if (isset($_REQUEST['GLOBALS']) || isset($_COOKIE['GLOBALS']))
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die('Invalid request variable.');
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// Same goes for numeric keys.
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foreach (array_merge(array_keys($_POST), array_keys($_GET), array_keys($_FILES)) as $key)
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if (is_numeric($key))
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die('Numeric request keys are invalid.');
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// Numeric keys in cookies are less of a problem. Just unset those.
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foreach ($_COOKIE as $key => $value)
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if (is_numeric($key))
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unset($_COOKIE[$key]);
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// Get the correct query string. It may be in an environment variable...
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if (!isset($_SERVER['QUERY_STRING']))
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$_SERVER['QUERY_STRING'] = getenv('QUERY_STRING');
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// It seems that sticking a URL after the query string is mighty common, well, it's evil - don't.
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if (strpos($_SERVER['QUERY_STRING'], 'http') === 0)
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{
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header('HTTP/1.1 400 Bad Request');
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die;
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}
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// Are we going to need to parse the ; out?
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if ((strpos(@ini_get('arg_separator.input'), ';') === false || @version_compare(PHP_VERSION, '4.2.0') == -1) && !empty($_SERVER['QUERY_STRING']))
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{
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// Get rid of the old one! You don't know where it's been!
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$_GET = array();
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// Was this redirected? If so, get the REDIRECT_QUERY_STRING.
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// Do not urldecode() the querystring, unless you so much wish to break OpenID implementation. :)
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$_SERVER['QUERY_STRING'] = substr($_SERVER['QUERY_STRING'], 0, 5) === 'url=/' ? $_SERVER['REDIRECT_QUERY_STRING'] : $_SERVER['QUERY_STRING'];
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// Replace ';' with '&' and '&something&' with '&something=&'. (this is done for compatibility...)
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// !!! smflib
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parse_str(preg_replace('/&(\w+)(?=&|$)/', '&$1=', strtr($_SERVER['QUERY_STRING'], array(';?' => '&', ';' => '&', '%00' => '', "\0" => ''))), $_GET);
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// Magic quotes still applies with parse_str - so clean it up.
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if (function_exists('get_magic_quotes_gpc') && @get_magic_quotes_gpc() != 0 && empty($modSettings['integrate_magic_quotes']))
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$_GET = $removeMagicQuoteFunction($_GET);
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}
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elseif (strpos(@ini_get('arg_separator.input'), ';') !== false)
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{
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if (function_exists('get_magic_quotes_gpc') && @get_magic_quotes_gpc() != 0 && empty($modSettings['integrate_magic_quotes']))
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$_GET = $removeMagicQuoteFunction($_GET);
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// Search engines will send action=profile%3Bu=1, which confuses PHP.
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foreach ($_GET as $k => $v)
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{
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if (is_string($v) && strpos($k, ';') !== false)
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{
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$temp = explode(';', $v);
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$_GET[$k] = $temp[0];
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for ($i = 1, $n = count($temp); $i < $n; $i++)
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{
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@list ($key, $val) = @explode('=', $temp[$i], 2);
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if (!isset($_GET[$key]))
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$_GET[$key] = $val;
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}
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}
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// This helps a lot with integration!
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if (strpos($k, '?') === 0)
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{
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$_GET[substr($k, 1)] = $v;
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unset($_GET[$k]);
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}
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}
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}
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// There's no query string, but there is a URL... try to get the data from there.
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if (!empty($_SERVER['REQUEST_URI']))
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{
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// Remove the .html, assuming there is one.
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if (substr($_SERVER['REQUEST_URI'], strrpos($_SERVER['REQUEST_URI'], '.'), 4) == '.htm')
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$request = substr($_SERVER['REQUEST_URI'], 0, strrpos($_SERVER['REQUEST_URI'], '.'));
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else
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$request = $_SERVER['REQUEST_URI'];
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// !!! smflib.
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// Replace 'index.php/a,b,c/d/e,f' with 'a=b,c&d=&e=f' and parse it into $_GET.
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if (strpos($request, basename($scripturl) . '/') !== false)
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{
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parse_str(substr(preg_replace('/&(\w+)(?=&|$)/', '&$1=', strtr(preg_replace('~/([^,/]+),~', '/$1=', substr($request, strpos($request, basename($scripturl)) + strlen(basename($scripturl)))), '/', '&')), 1), $temp);
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if (function_exists('get_magic_quotes_gpc') && @get_magic_quotes_gpc() != 0 && empty($modSettings['integrate_magic_quotes']))
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$temp = $removeMagicQuoteFunction($temp);
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$_GET += $temp;
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}
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}
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// If magic quotes is on we have some work...
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if (function_exists('get_magic_quotes_gpc') && @get_magic_quotes_gpc() != 0)
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{
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$_ENV = $removeMagicQuoteFunction($_ENV);
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$_POST = $removeMagicQuoteFunction($_POST);
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$_COOKIE = $removeMagicQuoteFunction($_COOKIE);
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foreach ($_FILES as $k => $dummy)
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if (isset($_FILES[$k]['name']))
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$_FILES[$k]['name'] = $removeMagicQuoteFunction($_FILES[$k]['name']);
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}
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// Add entities to GET. This is kinda like the slashes on everything else.
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$_GET = htmlspecialchars__recursive($_GET);
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// Let's not depend on the ini settings... why even have COOKIE in there, anyway?
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$_REQUEST = $_POST + $_GET;
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// Make sure $board and $topic are numbers.
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if (isset($_REQUEST['board']))
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{
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// Make sure its a string and not something else like an array
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$_REQUEST['board'] = (string) $_REQUEST['board'];
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// If there's a slash in it, we've got a start value! (old, compatible links.)
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if (strpos($_REQUEST['board'], '/') !== false)
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list ($_REQUEST['board'], $_REQUEST['start']) = explode('/', $_REQUEST['board']);
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// Same idea, but dots. This is the currently used format - ?board=1.0...
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elseif (strpos($_REQUEST['board'], '.') !== false)
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list ($_REQUEST['board'], $_REQUEST['start']) = explode('.', $_REQUEST['board']);
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// Now make absolutely sure it's a number.
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$board = (int) $_REQUEST['board'];
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$_REQUEST['start'] = isset($_REQUEST['start']) ? (int) $_REQUEST['start'] : 0;
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// This is for "Who's Online" because it might come via POST - and it should be an int here.
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$_GET['board'] = $board;
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}
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// Well, $board is going to be a number no matter what.
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else
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$board = 0;
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// If there's a threadid, it's probably an old YaBB SE link. Flow with it.
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if (isset($_REQUEST['threadid']) && !isset($_REQUEST['topic']))
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$_REQUEST['topic'] = $_REQUEST['threadid'];
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// We've got topic!
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if (isset($_REQUEST['topic']))
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{
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// Make sure its a string and not something else like an array
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$_REQUEST['topic'] = (string) $_REQUEST['topic'];
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// Slash means old, beta style, formatting. That's okay though, the link should still work.
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if (strpos($_REQUEST['topic'], '/') !== false)
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list ($_REQUEST['topic'], $_REQUEST['start']) = explode('/', $_REQUEST['topic']);
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// Dots are useful and fun ;). This is ?topic=1.15.
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elseif (strpos($_REQUEST['topic'], '.') !== false)
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list ($_REQUEST['topic'], $_REQUEST['start']) = explode('.', $_REQUEST['topic']);
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$topic = (int) $_REQUEST['topic'];
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// Now make sure the online log gets the right number.
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$_GET['topic'] = $topic;
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}
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else
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$topic = 0;
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// There should be a $_REQUEST['start'], some at least. If you need to default to other than 0, use $_GET['start'].
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if (empty($_REQUEST['start']) || $_REQUEST['start'] < 0 || (int) $_REQUEST['start'] > 2147473647)
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$_REQUEST['start'] = 0;
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// The action needs to be a string and not an array or anything else
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if (isset($_REQUEST['action']))
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$_REQUEST['action'] = (string) $_REQUEST['action'];
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if (isset($_GET['action']))
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$_GET['action'] = (string) $_GET['action'];
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// Some mail providers like to encode semicolons in activation URLs...
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if (!empty($_REQUEST['action']) && substr($_SERVER['QUERY_STRING'], 0, 18) == 'action=activate%3b')
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{
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header('Location: ' . $scripturl . '?' . str_replace('%3b', ';', $_SERVER['QUERY_STRING']));
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exit;
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}
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// Make sure we have a valid REMOTE_ADDR.
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if (!isset($_SERVER['REMOTE_ADDR']))
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{
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$_SERVER['REMOTE_ADDR'] = '';
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// A new magic variable to indicate we think this is command line.
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$_SERVER['is_cli'] = true;
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}
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elseif (preg_match('~^((([1]?\d)?\d|2[0-4]\d|25[0-5])\.){3}(([1]?\d)?\d|2[0-4]\d|25[0-5])$~', $_SERVER['REMOTE_ADDR']) === 0)
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$_SERVER['REMOTE_ADDR'] = 'unknown';
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// Try to calculate their most likely IP for those people behind proxies (And the like).
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$_SERVER['BAN_CHECK_IP'] = $_SERVER['REMOTE_ADDR'];
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// Find the user's IP address. (but don't let it give you 'unknown'!)
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if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']) && !empty($_SERVER['HTTP_CLIENT_IP']) && (preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['HTTP_CLIENT_IP']) == 0 || preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['REMOTE_ADDR']) != 0))
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{
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// We have both forwarded for AND client IP... check the first forwarded for as the block - only switch if it's better that way.
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if (strtok($_SERVER['HTTP_X_FORWARDED_FOR'], '.') != strtok($_SERVER['HTTP_CLIENT_IP'], '.') && '.' . strtok($_SERVER['HTTP_X_FORWARDED_FOR'], '.') == strrchr($_SERVER['HTTP_CLIENT_IP'], '.') && (preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['HTTP_X_FORWARDED_FOR']) == 0 || preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['REMOTE_ADDR']) != 0))
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$_SERVER['BAN_CHECK_IP'] = implode('.', array_reverse(explode('.', $_SERVER['HTTP_CLIENT_IP'])));
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else
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$_SERVER['BAN_CHECK_IP'] = $_SERVER['HTTP_CLIENT_IP'];
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}
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if (!empty($_SERVER['HTTP_CLIENT_IP']) && (preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['HTTP_CLIENT_IP']) == 0 || preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['REMOTE_ADDR']) != 0))
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{
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// Since they are in different blocks, it's probably reversed.
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if (strtok($_SERVER['REMOTE_ADDR'], '.') != strtok($_SERVER['HTTP_CLIENT_IP'], '.'))
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$_SERVER['BAN_CHECK_IP'] = implode('.', array_reverse(explode('.', $_SERVER['HTTP_CLIENT_IP'])));
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else
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$_SERVER['BAN_CHECK_IP'] = $_SERVER['HTTP_CLIENT_IP'];
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}
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elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
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{
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// If there are commas, get the last one.. probably.
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if (strpos($_SERVER['HTTP_X_FORWARDED_FOR'], ',') !== false)
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{
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$ips = array_reverse(explode(', ', $_SERVER['HTTP_X_FORWARDED_FOR']));
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// Go through each IP...
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foreach ($ips as $i => $ip)
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{
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// Make sure it's in a valid range...
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if (preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $ip) != 0 && preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['REMOTE_ADDR']) == 0)
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continue;
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// Otherwise, we've got an IP!
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$_SERVER['BAN_CHECK_IP'] = trim($ip);
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break;
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}
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}
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// Otherwise just use the only one.
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elseif (preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['HTTP_X_FORWARDED_FOR']) == 0 || preg_match('~^((0|10|172\.(1[6-9]|2[0-9]|3[01])|192\.168|255|127)\.|unknown)~', $_SERVER['REMOTE_ADDR']) != 0)
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$_SERVER['BAN_CHECK_IP'] = $_SERVER['HTTP_X_FORWARDED_FOR'];
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}
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// Make sure we know the URL of the current request.
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if (empty($_SERVER['REQUEST_URI']))
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$_SERVER['REQUEST_URL'] = $scripturl . (!empty($_SERVER['QUERY_STRING']) ? '?' . $_SERVER['QUERY_STRING'] : '');
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elseif (preg_match('~^([^/]+//[^/]+)~', $scripturl, $match) == 1)
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$_SERVER['REQUEST_URL'] = $match[1] . $_SERVER['REQUEST_URI'];
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else
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$_SERVER['REQUEST_URL'] = $_SERVER['REQUEST_URI'];
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// And make sure HTTP_USER_AGENT is set.
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$_SERVER['HTTP_USER_AGENT'] = isset($_SERVER['HTTP_USER_AGENT']) ? htmlspecialchars($smcFunc['db_unescape_string']($_SERVER['HTTP_USER_AGENT']), ENT_QUOTES) : '';
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// Some final checking.
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if (preg_match('~^((([1]?\d)?\d|2[0-4]\d|25[0-5])\.){3}(([1]?\d)?\d|2[0-4]\d|25[0-5])$~', $_SERVER['BAN_CHECK_IP']) === 0)
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$_SERVER['BAN_CHECK_IP'] = '';
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if ($_SERVER['REMOTE_ADDR'] == 'unknown')
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$_SERVER['REMOTE_ADDR'] = '';
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}
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// Adds slashes to the array/variable. Uses two underscores to guard against overloading.
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function escapestring__recursive($var)
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{
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global $smcFunc;
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if (!is_array($var))
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return $smcFunc['db_escape_string']($var);
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// Reindex the array with slashes.
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$new_var = array();
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// Add slashes to every element, even the indexes!
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foreach ($var as $k => $v)
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$new_var[$smcFunc['db_escape_string']($k)] = escapestring__recursive($v);
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return $new_var;
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}
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// Adds html entities to the array/variable. Uses two underscores to guard against overloading.
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function htmlspecialchars__recursive($var, $level = 0)
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{
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global $smcFunc;
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if (!is_array($var))
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return isset($smcFunc['htmlspecialchars']) ? $smcFunc['htmlspecialchars']($var, ENT_QUOTES) : htmlspecialchars($var, ENT_QUOTES);
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// Add the htmlspecialchars to every element.
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foreach ($var as $k => $v)
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$var[$k] = $level > 25 ? null : htmlspecialchars__recursive($v, $level + 1);
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return $var;
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}
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// Removes url stuff from the array/variable. Uses two underscores to guard against overloading.
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function urldecode__recursive($var, $level = 0)
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{
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if (!is_array($var))
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return urldecode($var);
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// Reindex the array...
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$new_var = array();
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// Add the htmlspecialchars to every element.
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foreach ($var as $k => $v)
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$new_var[urldecode($k)] = $level > 25 ? null : urldecode__recursive($v, $level + 1);
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return $new_var;
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}
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// Unescapes any array or variable. Two underscores for the normal reason.
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function unescapestring__recursive($var)
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{
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global $smcFunc;
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if (!is_array($var))
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return $smcFunc['db_unescape_string']($var);
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// Reindex the array without slashes, this time.
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$new_var = array();
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// Strip the slashes from every element.
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foreach ($var as $k => $v)
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$new_var[$smcFunc['db_unescape_string']($k)] = unescapestring__recursive($v);
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return $new_var;
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}
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// Remove slashes recursively...
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function stripslashes__recursive($var, $level = 0)
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{
|
|
if (!is_array($var))
|
|
return stripslashes($var);
|
|
|
|
// Reindex the array without slashes, this time.
|
|
$new_var = array();
|
|
|
|
// Strip the slashes from every element.
|
|
foreach ($var as $k => $v)
|
|
$new_var[stripslashes($k)] = $level > 25 ? null : stripslashes__recursive($v, $level + 1);
|
|
|
|
return $new_var;
|
|
}
|
|
|
|
// Trim a string including the HTML space, character 160.
|
|
function htmltrim__recursive($var, $level = 0)
|
|
{
|
|
global $smcFunc;
|
|
|
|
// Remove spaces (32), tabs (9), returns (13, 10, and 11), nulls (0), and hard spaces. (160)
|
|
if (!is_array($var))
|
|
return isset($smcFunc) ? $smcFunc['htmltrim']($var) : trim($var, ' ' . "\t\n\r\x0B" . '\0' . "\xA0");
|
|
|
|
// Go through all the elements and remove the whitespace.
|
|
foreach ($var as $k => $v)
|
|
$var[$k] = $level > 25 ? null : htmltrim__recursive($v, $level + 1);
|
|
|
|
return $var;
|
|
}
|
|
|
|
// Clean up the XML to make sure it doesn't contain invalid characters.
|
|
function cleanXml($string)
|
|
{
|
|
global $context;
|
|
|
|
// http://www.w3.org/TR/2000/REC-xml-20001006#NT-Char
|
|
return preg_replace('~[\x00-\x08\x0B\x0C\x0E-\x19' . ($context['utf8'] ? (@version_compare(PHP_VERSION, '4.3.3') != -1 ? '\x{FFFE}\x{FFFF}' : "\xED\xA0\x80-\xED\xBF\xBF\xEF\xBF\xBE\xEF\xBF\xBF") : '') . ']~' . ($context['utf8'] ? 'u' : ''), '', $string);
|
|
}
|
|
|
|
function JavaScriptEscape($string)
|
|
{
|
|
global $scripturl;
|
|
|
|
return '\'' . strtr($string, array(
|
|
"\r" => '',
|
|
"\n" => '\\n',
|
|
"\t" => '\\t',
|
|
'\\' => '\\\\',
|
|
'\'' => '\\\'',
|
|
'</' => '<\' + \'/',
|
|
'script' => 'scri\'+\'pt',
|
|
'<a href' => '<a hr\'+\'ef',
|
|
$scripturl => $scripturl . '\'+\'',
|
|
)) . '\'';
|
|
}
|
|
|
|
// Rewrite URLs to include the session ID.
|
|
function ob_sessrewrite($buffer)
|
|
{
|
|
global $scripturl, $modSettings, $user_info, $context;
|
|
|
|
// If $scripturl is set to nothing, or the SID is not defined (SSI?) just quit.
|
|
if ($scripturl == '' || !defined('SID'))
|
|
return $buffer;
|
|
|
|
// Do nothing if the session is cookied, or they are a crawler - guests are caught by redirectexit(). This doesn't work below PHP 4.3.0, because it makes the output buffer bigger.
|
|
// !!! smflib
|
|
if (empty($_COOKIE) && SID != '' && empty($context['browser']['possibly_robot']) && @version_compare(PHP_VERSION, '4.3.0') != -1)
|
|
$buffer = preg_replace('/(?<!<link rel="canonical" href=)"' . preg_quote($scripturl, '/') . '(?!\?' . preg_quote(SID, '/') . ')\\??/', '"' . $scripturl . '?' . SID . '&', $buffer);
|
|
// Debugging templates, are we?
|
|
elseif (isset($_GET['debug']))
|
|
$buffer = preg_replace('/(?<!<link rel="canonical" href=)"' . preg_quote($scripturl, '/') . '\\??/', '"' . $scripturl . '?debug;', $buffer);
|
|
|
|
// This should work even in 4.2.x, just not CGI without cgi.fix_pathinfo.
|
|
if (!empty($modSettings['queryless_urls']) && (!$context['server']['is_cgi'] || @ini_get('cgi.fix_pathinfo') == 1 || @get_cfg_var('cgi.fix_pathinfo') == 1) && ($context['server']['is_apache'] || $context['server']['is_lighttpd']))
|
|
{
|
|
// Let's do something special for session ids!
|
|
if (defined('SID') && SID != '')
|
|
$buffer = preg_replace_callback('~"' . preg_quote($scripturl, '/') . '\?(?:' . SID . '(?:;|&|&))((?:board|topic)=[^#"]+?)(#[^"]*?)?"~', 'sid_insert__preg_callback', $buffer);
|
|
else
|
|
$buffer = preg_replace_callback('~"' . preg_quote($scripturl, '/') . '\?((?:board|topic)=[^#"]+?)(#[^"]*?)?"~', 'pathinfo_insert__preg_callback', $buffer);
|
|
}
|
|
|
|
// Return the changed buffer.
|
|
return $buffer;
|
|
}
|
|
|
|
function sid_insert__preg_callback($matches)
|
|
{
|
|
global $scripturl;
|
|
return '"' . $scripturl . "/" . strtr($matches[1], '&;=', '//,') . ".html?" . SID . (isset($matches[2]) ? $matches[2] : "") . '"';
|
|
}
|
|
|
|
function pathinfo_insert__preg_callback($matches)
|
|
{
|
|
global $scripturl;
|
|
return '"' . $scripturl . "/" . strtr($matches[1], '&;=', '//,') . ".html" . (isset($matches[2]) ? $matches[2] : "") . '"';
|
|
}
|
|
?>
|