includes/common.php
author Dan
Wed, 12 Dec 2007 21:04:20 -0500
changeset 316 c74736571f43
parent 311 a007145a0ff6
child 313 854eecfada20
child 317 f8356d9c3481
permissions -rw-r--r--
SECURITY: CRITICAL: Fix SQL injection in admin CP page editor
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<?php
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/*
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 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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 * Version 1.0.2 (Coblynau)
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 * Copyright (C) 2006-2007 Dan Fuhry
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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/**
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 * The main loader script that initializes everything about Enano in the proper order. Prepare to get
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 * redirected if you don't have $_GET['title'] or $_SERVER['PATH_INFO'] set up.
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 * @package Enano
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 * @subpackage Core
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 * @copyright See header block
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 */
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// Make sure we don't have an attempt to inject globals (register_globals on)
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if ( isset($_REQUEST['GLOBALS']) )
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{
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  ?>
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  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><html><head><title>Hacking Attempt</title><meta http-equiv="Content-type" content="text/html; charset=utf-8" /></head><style type="text/css">body{background-color:#000;color:#CCC;font-family:trebuchet ms,sans-serif;font-size:9pt;}a{color:#FFF;}</style><body><p>Hacking attempt using <a href="http://www.hardened-php.net/index.76.html">PHP $GLOBALS overwrite vulnerability</a> detected, reported to admin</p><p>You're worse than this guy! Unless you are this guy...</p><p id="billp"><img alt=" " src="about:blank" id="billi" /></p><script type="text/javascript">// <![CDATA[
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  window.onload=function(){counter();setInterval('counter();', 1000);};var text=false;var cnt=10;function counter(){if(!text){text=document.createElement('span');text.id='billc';text.innerHTML=cnt;text.style.fontSize='96pt';text.style.color='#FF0000';p=document.getElementById('billp');p.appendChild(text);}else{if(cnt==1){document.getElementById('billi').src='http://upload.wikimedia.org/wikipedia/commons/7/7f/Bill_Gates_2004_cr.jpg';document.getElementById('billc').innerHTML='';return;}cnt--;document.getElementById('billc').innerHTML=cnt+' ';}}
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  // ]]>
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  </script><p><span style="color:black;">You been f***ed by Enano | valid XHTML 1.1</span></p></body></html>
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  <?php
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  exit;
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}
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// Our version number
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// This needs to match the version number in the database. This number should
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// be the expected output of enano_version(), which will always be in the
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// format of 1.0.2, 1.0.2a1, 1.0.2b1, 1.0.2RC1
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// You'll want to change this for custom distributions.
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$version = '1.0.2';
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/**
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 * Returns a floating-point number with the current UNIX timestamp in microseconds. Defined very early because we gotta call it
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 * from very early on in the script to measure the starting time of Enano.
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 * @return float
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 */
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function microtime_float()
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{
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  list($usec, $sec) = explode(" ", microtime());
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  return ((float)$usec + (float)$sec);
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}
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// Determine starting time
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global $_starttime;
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$_starttime = microtime_float();
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// Verbose error reporting
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error_reporting(E_ALL);
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//
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// Determine the location of Enano as an absolute path.
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//
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// We need to see if this is a specially marked Enano development server. You can create an Enano
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// development server by cloning the Mercurial repository into a directory named repo, and then
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// using symlinks to reference the original files so as to segregate unique files from non-unique
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// and distribution-standard ones. Enano will pivot its root directory accordingly if the file
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// .enanodev is found in the Enano root (not /repo/).
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if ( strpos(__FILE__, '/repo/') && ( file_exists('.enanodev') || file_exists('../.enanodev') ) )
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{
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  // We have a development directory. Remove /repo/ from the picture.
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  $filename = str_replace('/repo/', '/', __FILE__);
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}
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else
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{
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  // Standard Enano installation
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  $filename = __FILE__;
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}
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// ENANO_ROOT is sometimes defined by plugins like AjIM that need the constant before the Enano API is initialized
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if ( !defined('ENANO_ROOT') )
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  define('ENANO_ROOT', dirname(dirname($filename)));
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// Debugging features are PHP5-specifid
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if ( defined('ENANO_DEBUG') && version_compare(PHP_VERSION, '5.0.0') < 0 )
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{
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  die(__FILE__.':'.__LINE__.': The debugConsole requires PHP 5.x.x or greater. Please comment out the ENANO_DEBUG constant in your index.php.');
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}
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// We deprecated debugConsole in 1.0.2 because it was never used and there were a lot of unneeded debugging points in the code.
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// _nightly.php is used to tag non-Mercurial-generated nightly builds
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if ( file_exists( ENANO_ROOT . '/_nightly.php') )
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  require(ENANO_ROOT.'/_nightly.php');
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// List of scheduled tasks (don't change this manually, use register_cron_task())
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$cron_tasks = array();
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// Start including files. LOTS of files. Yeah!
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require_once(ENANO_ROOT.'/includes/constants.php');
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require_once(ENANO_ROOT.'/includes/functions.php');
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require_once(ENANO_ROOT.'/includes/dbal.php');
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require_once(ENANO_ROOT.'/includes/paths.php');
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require_once(ENANO_ROOT.'/includes/sessions.php');
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require_once(ENANO_ROOT.'/includes/template.php');
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require_once(ENANO_ROOT.'/includes/plugins.php');
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require_once(ENANO_ROOT.'/includes/comment.php');
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require_once(ENANO_ROOT.'/includes/wikiformat.php');
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require_once(ENANO_ROOT.'/includes/diff.php');
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require_once(ENANO_ROOT.'/includes/render.php');
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require_once(ENANO_ROOT.'/includes/stats.php');
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require_once(ENANO_ROOT.'/includes/pageutils.php');
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require_once(ENANO_ROOT.'/includes/js-compressor.php');
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require_once(ENANO_ROOT.'/includes/rijndael.php');
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require_once(ENANO_ROOT.'/includes/email.php');
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require_once(ENANO_ROOT.'/includes/search.php');
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require_once(ENANO_ROOT.'/includes/json.php');
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require_once(ENANO_ROOT.'/includes/wikiengine/Tables.php');
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require_once(ENANO_ROOT.'/includes/pageprocess.php');
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require_once(ENANO_ROOT.'/includes/tagcloud.php');
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strip_magic_quotes_gpc();
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// Enano has five main components: the database abstraction layer (DBAL), the session manager,
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// the path/URL manager, the template engine, and the plugin manager.
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// Each part has its own class and a global object; nearly all Enano functions are handled by one of these five components.
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// All of these classes are singletons and are designed to carry as much data as possible within the object
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// to make data access and function calling easy.
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global $db, $session, $paths, $template, $plugins; // Common objects
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global $enano_config; // A global used to cache config information without making loads of queries ;-)
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                      // In addition, $enano_config is used to fetch config information if die_semicritical() is called.
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// Jim Tucek's e-mail encryption code                      
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global $email;
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// Because Enano sends out complete URLs in several occasions, we need to know what hostname the user is requesting the page from.
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// In future versions we may include a fallback "safety" host to use, but that's too much to worry about now
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if ( !isset($_SERVER['HTTP_HOST']) )
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  grinding_halt('Cannot get hostname', '<p>Your web browser did not provide the HTTP Host: field. This site requires a modern browser that supports the HTTP 1.1 standard.</p>');
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//
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// END BACKGROUND AND ENVIRONMENT CHECKS
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//
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//
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// MAIN API INITIALIZATION
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//
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// The first thing we need to do is start the database connection. At this point, for all we know, Enano might not
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// even be installed. If this connection attempt fails and it's because of a missing or corrupt config file, the
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// user will be redirected (intelligently) to install.php.
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$db = new mysql();
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$db->connect();
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// The URL separator is the character appended to contentPath + url_title type strings.
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// If the contentPath has a ? in it, this should be an ampersand; else, it should be a
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// question mark.
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$sep = ( strstr(contentPath, '?') ) ? '&' : '?';
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define('urlSeparator', $sep);
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unset($sep); // save 10 bytes of memory...
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// Sometimes there are critical failures triggered by initialization functions in the Enano API that are recurring
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// and cannot be fixed except for manual intervention. This is where that code should go.
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if ( isset($_GET['do']) && $_GET['do'] == 'diag' && isset($_GET['sub']) )
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{
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  switch($_GET['sub'])
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  {
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    case 'cookie_destroy':
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      unset($_COOKIE['sid']);
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      setcookie('sid', '', time()-3600*24, scriptPath);
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      setcookie('sid', '', time()-3600*24, scriptPath.'/');
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      die('Session cookie cleared. <a href="'.$_SERVER['PHP_SELF'].'">Continue</a>');
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      break;
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  }
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}
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// Select and fetch the site configuration
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$e = $db->sql_query('SELECT config_name, config_value FROM '.table_prefix.'config;');
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if ( !$e )
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{
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  $db->_die('Some critical configuration information could not be selected.');
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}
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// Used in die_semicritical to figure out whether to call getConfig() or not
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define('ENANO_CONFIG_FETCHED', '');
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// Initialize and fetch the site configuration array, which is used to cache the config
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$enano_config = Array();
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while($r = $db->fetchrow())
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{
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  $enano_config[$r['config_name']] = $r['config_value'];
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}
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$db->free_result();
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// Now that we have the config, check the Enano version.
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if ( enano_version(false, true) != $version )
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{
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  grinding_halt('Version mismatch', '<p>It seems that the Enano release we\'re trying to run ('.$version.') is different from the version specified in your database ('.enano_version().'). Perhaps you need to <a href="'.scriptPath.'/upgrade.php">upgrade</a>?</p>');
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}
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//
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// Low level maintenance
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//
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// If the AES key size has been changed, bail out and fast
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if ( !getConfig('aes_key_size') )
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{
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  setConfig('aes_key_size', AES_BITS);
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}
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else if ( $ks = getConfig('aes_key_size') )
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{
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  if ( intval($ks) != AES_BITS )
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  {
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    grinding_halt('AES key size changed', '<p>Enano has detected that the AES key size in constants.php has been changed. This change cannot be performed after installation, otherwise the private key would have to be re-generated and all passwords would have to be re-encrypted.</p><p>Please change the key size back to ' . $ks . ' bits and reload this page.</p>');
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  }
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}
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// Same for AES block size
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if ( !getConfig('aes_block_size') )
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{
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  setConfig('aes_block_size', AES_BLOCKSIZE);
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}
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else if ( $ks = getConfig('aes_block_size') )
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{
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  if ( intval($ks) != AES_BLOCKSIZE )
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  {
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    grinding_halt('AES block size changed', '<p>Enano has detected that the AES block size in constants.php has been changed. This change cannot be performed after installation, otherwise all passwords would have to be re-encrypted.</p><p>Please change the block size back to ' . $ks . ' bits and reload this page.</p>');
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  }
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}
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// Our list of tables included in Enano
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$system_table_list = Array(
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    table_prefix.'categories',
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    table_prefix.'comments',
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    table_prefix.'config',
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    table_prefix.'logs',
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    table_prefix.'page_text',
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    table_prefix.'session_keys',
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    table_prefix.'pages',
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    table_prefix.'users',
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    table_prefix.'users_extra',
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    table_prefix.'themes',
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    table_prefix.'buddies',
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    table_prefix.'banlist',
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    table_prefix.'files',
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    table_prefix.'privmsgs',
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    table_prefix.'sidebar',
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    table_prefix.'hits',
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    table_prefix.'search_index',
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    table_prefix.'groups',
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    table_prefix.'group_members',
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    table_prefix.'acl',
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    table_prefix.'page_groups',
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    table_prefix.'page_group_members',
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    table_prefix.'tags'
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  );
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// Load plugin manager
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$plugins = new pluginLoader();
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//
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// Mainstream API boot-up
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//
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// Obtain list of plugins
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$plugins->loadAll();
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global $plugins;
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// Load plugins from common because we can't give plugins full abilities in object context
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foreach ( $plugins->load_list as $f )
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{
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  include_once $f;
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}
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// Three fifths of the Enano API gets the breath of life right here.
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$session = new sessionManager();
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$paths = new pathManager();
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$template = new template();
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$email = new EmailEncryptor();
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// We've got the five main objects - flick on the switch so if a problem occurs, we can have a "friendly" UI
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define('ENANO_BASE_CLASSES_INITIALIZED', '');
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// From here on out, none of this functionality is needed during the installer stage.
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// Once $paths->init() is called, we could be redirected to the main page, so we don't want
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// that if the installer's running. Don't just go and define IN_ENANO_INSTALL from your
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// script though, because that will make the DBAL look in the wrong place for the config file.
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if ( !defined('IN_ENANO_INSTALL') )
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{
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  // And here you have it, the de facto way to place a hook. Plugins can place hooks and hook
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  // into other plugins. You just never know.
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  $code = $plugins->setHook('base_classes_initted');
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  foreach ( $code as $cmd )
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  {
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    eval($cmd);
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  }
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  // For special and administration pages, sometimes there is a "preloader" function that must be run
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  // before the session manager and/or path manager get the init signal. Call it here.  
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  $p = RenderMan::strToPageId($paths->get_pageid_from_url());
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  if( ( $p[1] == 'Admin' || $p[1] == 'Special' ) && function_exists('page_'.$p[1].'_'.$p[0].'_preloader'))
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  {
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    @call_user_func('page_'.$p[1].'_'.$p[0].'_preloader');
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  }
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  // One quick security check...
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  if ( !is_valid_ip($_SERVER['REMOTE_ADDR']) )
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  {
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    die('SECURITY: spoofed IP address');
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  }
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  // All checks passed! Start the main components up.  
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  $session->start();
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  $paths->init();
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  // We're ready for whatever life throws us now.
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  define('ENANO_MAINSTREAM', '');
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  // If the site is disabled, bail out, unless we're trying to log in or administer the site
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  if(getConfig('site_disabled') == '1' && $session->user_level < USER_LEVEL_ADMIN)
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  {
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    if ( $paths->namespace == 'Admin' || ( $paths->namespace == 'Special' && ( $paths->cpage['urlname_nons'] == 'CSS' || $paths->cpage['urlname_nons'] == 'Administration' || $paths->cpage['urlname_nons'] == 'Login' ) ) )
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    {
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      // do nothing; allow execution to continue
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    }
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    else
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    {
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      if(!$n = getConfig('site_disabled_notice')) 
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      {
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        $n = 'The administrator has disabled the site. Please check back later.';
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      }
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      $text = RenderMan::render($n) . '
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      <div class="info-box">
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        If you have an administrative account, you may <a href="'.makeUrlNS('Special', 'Login').'">log in</a> to the site.
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      </div>';
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      $paths->wiki_mode = 0;
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      die_semicritical('Site disabled', $text);
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    }
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  }
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  else if ( getConfig('site_disabled') == '1' && $session->user_level >= USER_LEVEL_ADMIN )
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  {
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    // If the site is disabled but the user has admin rights, allow browsing
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    // and stuff, but display the orange box notifying the admin.
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    $template->site_disabled = true;
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  }
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  // A better name for this hook would be common_post. At this point
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  // all of Enano is fully initialized and running and you're ready
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  // to do whatever you want.
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  $code = $plugins->setHook('session_started');
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  foreach ( $code as $cmd )
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  {
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    eval($cmd);
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  }
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  if ( isset($_GET['noheaders']) )
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    $template->no_headers = true;
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}
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// That's the end. Enano should be loaded now :-)
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?>