Fixed complicated SQL injection vulnerability in URL handler, updated license info for Tigra Tree Menu, and killed one XSS vulnerability
<?php/* * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between * Version 1.0 (Banshee) * pageprocess.php - intelligent retrieval of pages * Copyright (C) 2006-2007 Dan Fuhry * * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details. *//** * Class to handle fetching page text (possibly from a cache) and formatting it. * @package Enano * @subpackage UI * @copyright 2007 Dan Fuhry * @license GNU General Public License <http://www.gnu.org/licenses/gpl.html> */class PageProcessor{ /** * Page ID and namespace of the page handled by this instance * @var string */ var $page_id; var $namespace; /** * Unsanitized page ID. * @var string */ var $page_id_unclean; /** * Tracks if the page we're loading exists in the database or not. * @var bool */ var $page_exists = false; /** * Permissions! * @var object */ var $perms = null; /** * Switch to track if redirects are allowed. Defaults to true. * @var bool */ var $allow_redir = true; /** * If this is set to true, this will call the header and footer funcs on $template when render() is called. * @var bool */ var $send_headers = false; /** * Cache the fetched text so we don't fetch it from the DB twice. * @var string */ var $text_cache = ''; /** * Debugging information to track errors. You can set enable to false to disable sending debug information. * @var array */ var $debug = array( 'enable' => true, 'works' => false ); /** * Constructor. * @param string The page ID (urlname) of the page * @param string The namespace of the page */ function __construct( $page_id, $namespace ) { global $db, $session, $paths, $template, $plugins; // Common objects // See if we can get some debug info if ( function_exists('debug_backtrace') && $this->debug['enable'] ) { $this->debug['works'] = true; $this->debug['backtrace'] = enano_debug_print_backtrace(true); } // First things first - check page existence and permissions if ( !isset($paths->nslist[$namespace]) ) { $this->send_error('The namespace "' . htmlspecialchars($namespace) . '" does not exist.'); } $this->_setup( $page_id, $namespace ); } /** * The main method to send the page content. Also responsible for checking permissions. */ function send() { global $db, $session, $paths, $template, $plugins; // Common objects if ( !$this->perms->get_permissions('read') ) { $this->err_access_denied(); return false; } if ( $this->namespace == 'Special' || $this->namespace == 'Admin' ) { if ( !$this->page_exists ) { redirect( makeUrl(getConfig('main_page')), 'Can\'t find special page', 'The special or administration page you requested does not exist. You will now be transferred to the main page.', 2 ); } $func_name = "page_{$this->namespace}_{$this->page_id}"; if ( function_exists($func_name) ) { return @call_user_func($func_name); } else { $title = 'Page backend not found'; $message = "The administration page you are looking for was properly registered using the page API, but the backend function (<tt>$fname</tt>) was not found. If this is a plugin page, then this is almost certainly a bug with the plugin."; if ( $this->send_headers ) { $template->tpl_strings['PAGE_NAME'] = $title; $template->header(); echo "<p>$message</p>"; $template->footer(); } else { echo "<h2>$title</h2> <p>$message</p>"; } return false; } } else if ( $this->namespace == 'User' ) { $this->_handle_userpage(); } else if ( ( $this->namespace == 'Template' || $this->namespace == 'System' ) && $this->page_exists ) { $this->header(); $text = $this->fetch_text(); $text = preg_replace('/<noinclude>(.*?)<\/noinclude>/is', '\\1', $text); $text = preg_replace('/<nodisplay>(.*?)<\/nodisplay>/is', '', $text); $text = RenderMan::render( $text ); echo $text; $this->footer(); } else if ( !$this->page_exists ) { // Perhaps this is hooked? ob_start(); $code = $plugins->setHook('page_not_found'); foreach ( $code as $cmd ) { eval($cmd); } $ob = ob_get_contents(); if ( empty($ob) ) { $this->err_page_not_existent(); } } else // (disabled for compatibility reasons) if ( in_array($this->namespace, array('Article', 'User', 'Project', 'Help', 'File', 'Category')) && $this->page_exists ) { // Send as regular page $text = $this->fetch_text(); if ( $text == 'err_no_text_rows' ) { $this->err_no_rows(); return false; } else { $this->render(); } } } /** * Sets internal variables. * @access private */ function _setup($page_id, $namespace) { global $db, $session, $paths, $template, $plugins; // Common objects $page_id_cleaned = sanitize_page_id($page_id); $this->page_id = $page_id_cleaned; $this->namespace = $namespace; $this->page_id_unclean = dirtify_page_id($page_id); $this->perms = $session->fetch_page_acl( $page_id, $namespace ); // Exception for Admin: pages if ( $this->namespace == 'Admin' ) { $fname = "page_Admin_{$this->page_id}"; } // Does the page "exist"? if ( $paths->cpage['urlname_nons'] == $page_id && $paths->namespace == $namespace && !$paths->page_exists && ( $this->namespace != 'Admin' || ($this->namespace == 'Admin' && !function_exists($fname) ) ) ) { $this->page_exists = false; } else if ( !isset( $paths->pages[ $paths->nslist[$namespace] . $page_id ] ) && ( $this->namespace == 'Admin' && !function_exists($fname) ) ) { $this->page_exists = false; } else { $this->page_exists = true; } } /** * Renders it all in one go, and echoes it out. This assumes that the text is in the DB. * @access private */ function render() { $text = $this->fetch_text(); $this->header(); if ( $this->send_headers ) { display_page_headers(); } $text = '?>' . RenderMan::render($text); // echo('<pre>'.htmlspecialchars($text).'</pre>'); eval ( $text ); if ( $this->send_headers ) { display_page_footers(); } $this->footer(); } /** * Sends the page header, dependent on, of course, whether we're supposed to. */ function header() { global $db, $session, $paths, $template, $plugins; // Common objects if ( $this->send_headers ) $template->header(); } /** * Sends the page footer, dependent on, of course, whether we're supposed to. */ function footer() { global $db, $session, $paths, $template, $plugins; // Common objects if ( $this->send_headers ) $template->footer(); } /** * Fetches the raw, unfiltered page text. * @access public */ function fetch_text() { global $db, $session, $paths, $template, $plugins; // Common objects if ( !empty($this->text_cache) ) { return $this->text_cache; } $q = $db->sql_query('SELECT page_text, char_tag FROM '.table_prefix.'page_text WHERE page_id=\'' . $this->page_id . '\' AND namespace=\'' . $this->namespace . '\';'); if ( !$q ) { $this->send_error('Error during SQL query.', true); } if ( $db->numrows() < 1 ) { $this->page_exists = false; return 'err_no_text_rows'; } $row = $db->fetchrow(); $db->free_result(); if ( !empty($row['char_tag']) ) { // This page text entry uses the old text-escaping format $from = array( "{APOS:{$row['char_tag']}}", "{QUOT:{$row['char_tag']}}", "{SLASH:{$row['char_tag']}}" ); $to = array("'", '"', '\\'); $row['page_text'] = str_replace($from, $to, $row['page_text']); } $this->text_cache = $row['page_text']; return $row['page_text']; } /** * Handles the extra overhead required for user pages. * @access private */ function _handle_userpage() { global $db, $session, $paths, $template, $plugins; // Common objects if ( $this->page_id == $paths->cpage['urlname_nons'] && $this->namespace == $paths->namespace ) { $page_name = ( isset($paths->cpage['name']) ) ? $paths->cpage['name'] : $this->page_id; } else { $page_name = ( isset($paths->pages[$this->page_id]) ) ? $paths->pages[$this->page_id]['name'] : $this->page_id; } if ( $page_name == str_replace('_', ' ', $this->page_id) || $page_name == $paths->nslist['User'] . str_replace('_', ' ', $this->page_id) ) { $target_username = strtr($page_name, Array( '_' => ' ', '<' => '<', '>' => '>' )); $target_username = preg_replace('/^' . preg_quote($paths->nslist['User']) . '/', '', $target_username); $page_name = "$target_username's user page"; } else { // User has a custom title for their userpage $page_name = $paths->pages[ $paths->nslist[$this->namespace] . $this->page_id ]['name']; } $template->tpl_strings['PAGE_NAME'] = htmlspecialchars($page_name); $this->header(); if ( $send_headers ) { display_page_headers(); } // Start left sidebar: basic user info, latest comments echo '<table border="0" cellspacing="4" cellpadding="0" style="width: 100%;">'; echo '<tr><td style="width: 150px;">'; echo '<div class="tblholder"> <table border="0" cellspacing="1" cellpadding="4">'; // Main part of sidebar echo ' </table> </div>'; echo '</td><td>'; // User's own content $send_headers = $this->send_headers; $this->send_headers = false; if ( $this->page_exists ) { $this->render(); } else { $this->err_page_not_existent(); } // Right sidebar echo '</td><td style="width: 150px;">'; echo '<div class="tblholder"> <table border="0" cellspacing="1" cellpadding="4">'; // Main part of sidebar echo ' </table> </div>'; echo '</tr></table>'; if ( $send_headers ) { display_page_footers(); } $this->send_headers = $send_headers; unset($send_headers); $this->footer(); } /** * Send the error message to the user that the access to this page is denied. * @access private */ function err_access_denied() { global $db, $session, $paths, $template, $plugins; // Common objects $ob = ''; $template->tpl_strings['PAGE_NAME'] = 'Access denied'; if ( $this->send_headers ) { $ob .= $template->getHeader(); } $ob .= '<div class="error-box"><b>Access to this page is denied.</b><br />This may be because you are not logged in or you have not met certain criteria for viewing this page.</div>'; if ( $this->send_headers ) { $ob .= $template->getFooter(); } echo $ob; } /** * Send the error message to the user complaining that there weren't any rows. * @access private */ function err_no_rows() { global $db, $session, $paths, $template, $plugins; // Common objects $title = 'No text rows'; $message = 'While the page\'s existence was verified, there were no rows in the database that matched the query for the text. This may indicate a bug with the software; ask the webmaster for more information. The offending query was:<pre>' . $db->latest_query . '</pre>'; if ( $this->send_headers ) { $template->tpl_strings['PAGE_NAME'] = $title; $template->header(); echo "<p>$message</p>"; $template->footer(); } else { echo "<h2>$title</h2> <p>$message</p>"; } } /** * Tell the user the page doesn't exist, and present them with their options. * @access private */ function err_page_not_existent() { global $db, $session, $paths, $template, $plugins; // Common objects $this->header(); header('HTTP/1.1 404 Not Found'); echo '<h3>There is no page with this title yet.</h3> <p>You have requested a page that doesn\'t exist yet.'; if ( $session->get_permissions('create_page') ) { echo ' You can <a href="'.makeUrlNS($this->namespace, $this->page_id, 'do=edit', true).'" onclick="ajaxEditor(); return false;">create this page</a>, or return to the <a href="'.makeUrl(getConfig('main_page')).'">homepage</a>.'; } else { echo ' Return to the <a href="'.makeUrl(getConfig('main_page')).'">homepage</a>.</p>'; } if ( $session->get_permissions('history_rollback') ) { $e = $db->sql_query('SELECT * FROM ' . table_prefix . 'logs WHERE action=\'delete\' AND page_id=\'' . $this->page_id . '\' AND namespace=\'' . $this->namespace . '\' ORDER BY time_id DESC;'); if ( !$e ) { $db->_die('The deletion log could not be selected.'); } if ( $db->numrows() > 0 ) { $r = $db->fetchrow(); echo '<p>This page also appears to have some log entries in the database - it seems that it was deleted on ' . $r['date_string'] . '. You can probably <a href="'.makeUrl($paths->page, 'do=rollback&id='.$r['time_id']).'" onclick="ajaxRollback(\''.$r['time_id'].'\'); return false;">roll back</a> the deletion.</p>'; } $db->free_result(); } echo '<p> HTTP Error: 404 Not Found </p>'; $this->footer(); } /** * PHP 4 constructor. * @see PageProcessor::__construct() */ function PageProcessor( $page_id, $namespace ) { $this->__construct($page_id, $namespace); } /** * Send an error message and die * @var string Error message * @var bool If true, send DBAL's debugging information as well */ function send_error($message, $sql = false) { global $db, $session, $paths, $template, $plugins; // Common objects $content = "<p>$message</p>"; $template->tpl_strings['PAGE_NAME'] = 'General error in page fetcher'; if ( $this->debug['works'] ) { $content .= $this->debug['backtrace']; } header('HTTP/1.1 500 Internal Server Error'); $template->header(); echo $content; $template->footer(); $db->close(); exit; }} // class PageProcessor?>