311 lines
10 KiB
Plaintext
311 lines
10 KiB
Plaintext
<?php
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/*
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* Gallery - a web based photo album viewer and editor
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* Copyright (C) 2000-2007 Bharat Mediratta
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* 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
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/**
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* Setup filesytem storage directory
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* @package Install
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*/
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class StorageSetupStep extends InstallStep {
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function stepName() {
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return _('Storage Setup');
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}
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function loadTemplateData(&$templateData) {
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global $galleryStub;
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if (empty($this->_dir)) {
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$this->_dir = $galleryStub->getConfig('data.gallery.base');
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if (empty($this->_dir)) {
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$this->_dir = $_SESSION['configPath'] . DIRECTORY_SEPARATOR . 'g2data';
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}
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}
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/*
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* An example for a slightly obfuscated g2data folder name such that the location
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* of the storage folder can't be guessed too easily.
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*/
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$templateData['suggested_obfuscated_g2data_name'] = 'g2data_' . substr(md5(rand()),0 , 10);
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$templateData['isMultisite'] = $galleryStub->getConfig('isMultisite');
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if (!empty($_POST['action']) && $_POST['action'] == 'save') {
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if (empty($_POST['dir'])) {
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$templateData['error']['missing_value'] = 1;
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} else {
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$dir = rtrim($this->sanitize($_POST['dir']));
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/* Normalize the path, add a traling slash if necessary */
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if (substr($dir, -1) != DIRECTORY_SEPARATOR) {
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$dir .= DIRECTORY_SEPARATOR;
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}
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/*
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* Make the path absolute since relative to the install/ folder isn't the same as
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* relative to the main.php entry file. And also check if it exists.
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*/
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$realPath = @realpath($dir);
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if (empty($realPath)) {
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/*
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* The folder does not exist yet. If we have already write permission on the
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* parent folder, create the storage folder.
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*/
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$parentDir = realpath(dirname($dir));
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if (!empty($parentDir) && is_dir($parentDir)
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&& is_readable($parentDir) && is_writeable($parentDir)) {
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$dir = $parentDir . DIRECTORY_SEPARATOR
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. basename($dir) . DIRECTORY_SEPARATOR;
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/* Create the storage folder with restrictive permissions */
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if (@mkdir($dir)) {
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chmod($dir, 0700);
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}
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}
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}
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/* Check if the (newly created) dir exists, is writeable etc. */
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if (!is_dir($dir)) {
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$templateData['error']['missing_dir'] = 1;
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} else if (!is_readable($dir)) {
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$templateData['error']['inaccessible_dir'] = 1;
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} else if (!is_writeable($dir)) {
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$templateData['error']['readonly_dir'] = 1;
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} else {
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/*
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* Security check:
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* If the user ticks the checkbox and thereby acknowledges that the storage
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* folder might be accessible from the web, we proceed with the installation.
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*/
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list ($checkExecuted, $webAccessible) =
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$this->_isStoragePathWebAccessible($dir);
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if (empty($_POST['i_acknowledge_the_risk'])
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&& (!$checkExecuted || $webAccessible)) {
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if (!$checkExecuted) {
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/* Show a warning suggesting an obfuscated path. */
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$templateData['error']['possibly_web_accessible_dir'] = 1;
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} else if ($webAccessible) {
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$templateData['error']['web_accessible_dir'] = 1;
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}
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} else {
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/*
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* Populate the dir.
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*/
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if (!populateDataDirectory($dir)) {
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$templateData['error']['creation_error'] = 1;
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} else {
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$this->_dir = $dir;
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$this->setComplete(true);
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}
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}
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}
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}
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$templateData['dir'] = $dir;
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} else {
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$templateData['dir'] = $this->_dir;
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}
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if ($this->isComplete()) {
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$galleryStub->setConfig('data.gallery.base', $this->_dir);
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$templateData['bodyFile'] = 'StorageSetupSuccess.html';
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} else {
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$templateData['bodyFile'] = 'StorageSetupRequest.html';
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}
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if (!strncasecmp(PHP_OS, 'win', 3)) {
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$templateData['OS'] = 'winnt';
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} else {
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$templateData['OS'] = 'unix';
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}
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}
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function processRequest() {
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if (!empty($_GET['doAutoComplete'])) {
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processAutoCompleteRequest();
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return false;
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}
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return true;
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}
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function isRedoable() {
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return true;
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}
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/**
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* Try to protect the given folder with a .htaccess file from direct web-access.
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* And then check if the given folder is web-accessible either way.
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* Precondition: gallery and g2data folders exist.
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*
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* @return array(boolean false if check procedure failed due to platform issues,
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* boolean true if the folder is accessible from the web (=insecure))
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*/
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function _isStoragePathWebAccessible($dir) {
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/* Check if we can use fsockopen. Else we can't test it at all. */
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if (!function_exists('fsockopen')
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|| in_array('fsockopen', split(',\s*', ini_get('disable_functions')))) {
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return array(false, false);
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}
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/* Add a .htaccess file. */
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if (!secureStorageFolder($dir)) {
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return array(false, false);
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}
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/* Add a probe file. */
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$probeFileName = 'probe_' . substr(md5(uniqid(rand())), 0, 10) . '.html';
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$probeFilePath = $dir . $probeFileName;
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$checkString = md5(rand());
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$fh = @fopen($probeFilePath, 'w');
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if ($fh) {
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$contents = "<html><head><title>Probe</title><body>$checkString</body></html>";
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fwrite($fh, $contents);
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fclose($fh);
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}
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if (!file_exists($probeFilePath)) {
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return array(false, false);
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}
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/* Try to guess the URL to the g2data folder. */
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$storageUrlCandidates = array();
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/* Get the URL of the G2 folder. */
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$galleryUrl = getGalleryDirUrl();
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/* Get the relative path of the g2data folder to the gallery dir. */
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$storagePath = realpath($dir);
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$galleryPath = realpath(dirname(dirname(dirname(__FILE__))));
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if (strpos($storagePath, $galleryPath) === 0) {
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/* The g2data folder is within the gallery folder. */
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$relativeStoragePath = substr($storagePath, strlen($galleryPath) + 1);
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$relativeStoragePath = str_replace("\\", '/', $relativeStoragePath);
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$storageUrlCandidates[] = $galleryUrl . $relativeStoragePath . '/';
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} else {
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/*
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* The g2data folder is in another directory tree.
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* Try to remove the common part of the paths and then construct a URL.
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*/
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$galleryPathElements = explode(DIRECTORY_SEPARATOR, $galleryPath);
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$storagePathElements = explode(DIRECTORY_SEPARATOR, $storagePath);
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$max = 30;
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/* Before: e.g. /foo/bar/gallery2/ and /foo/bar/g2data/. */
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while (!empty($galleryPathElements) && !empty($storagePathElements) && $max-- > 0
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&& $galleryPathElements[0] == $storagePathElements[0]) {
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array_shift($storagePathElements);
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array_shift($galleryPathElements);
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}
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/* After, e.g. /g2data/ (common part removed). */
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$relativeStoragePath = implode('/', $storagePathElements);
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$storageUrlCandidates[] = getBaseUrl() . '/' . $relativeStoragePath . '/';
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if (preg_match('!^.*?://.*?/[^/]+!', $galleryUrl, $matches)) {
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$storageUrlCandidates[] = $matches[0] . '/' . $relativeStoragePath . '/';
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}
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}
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/* Also try the default path and other common paths. */
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$storageUrlCandidates[] = $galleryUrl . basename($dir) . '/';
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$storageUrlCandidates[] = getBaseUrl() . '/' . basename($dir) . '/';
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/* Try to fetch the probe file. */
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$isAccessible = false;
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foreach ($storageUrlCandidates as $storageFolderUrl) {
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$url = $storageFolderUrl . $probeFileName;
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list ($urlFetched, $isAccessible) = $this->_isUrlAccessible($url, $checkString);
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if ($urlFetched && $isAccessible) {
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$isAccessible = true;
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break;
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}
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}
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/* Cleanup: Delete the probe file. */
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unlink($probeFilePath);
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return array(true, $isAccessible);
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}
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/**
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* Try to fetch a a probe file from the storage folder and check if the returned page contains
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* the probe string. If so, the storage folder is web-accessible (read: not secure).
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*
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* @param string $url the URL that should be fetched
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* @param string $probeString expected string from the fetched file
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* @return array(boolean false if check procedure failed due to platform issues,
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* boolean true if the folder is accessible from the web (=insecure))
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*/
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function _isUrlAccessible($url, $probeString) {
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$components = @parse_url($url);
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if (!$components) {
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return array(false, false);
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}
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$port = empty($components['port']) ? 80 : $components['port'];
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if (empty($components['path'])) {
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$components['path'] = '/';
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}
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$fd = @fsockopen($components['host'], $port, $errno, $errstr, 1);
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if (empty($fd)) {
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return array(false, false);
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}
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$get = $components['path'];
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/* Read the web page into a buffer */
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$ok = fwrite($fd, sprintf("GET %s HTTP/1.0\r\n" .
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"Host: %s\r\n" .
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"\r\n",
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$get,
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$components['host']));
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if (!$ok) {
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/* Zero bytes written or false was returned */
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return array(false, false);
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}
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fflush($fd);
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/*
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* Read the response code. fgets stops after newlines.
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* The first line contains only the status code (200, 404, etc.).
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*/
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$headers = array();
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$response = trim(fgets($fd, 4096));
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/*
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* Ignore the status code.
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* We expect either a 2xx code which would mean that the file has been fetched successfully
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* (or there's a 404 -> redirect that suppresses the 404) and we check that later
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* with the probe text.
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* Or we expect an internal server 500 because mod_access is not installed.
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* Or a 403 Forbidden since the .htaccess rule works correctly.
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* Or a 404 because the URL is just plain wrong.
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*
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* Let's interpret everything but a successfully detected probe page as "secure".
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*/
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/* Ignore the headers. */
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while (!feof($fd)) {
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$line = trim(fgets($fd, 4096));
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if (empty($line)) {
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break;
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}
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}
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/* Read the body */
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$fetchedPage = '';
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while (!feof($fd)) {
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$fetchedPage .= fread($fd, 4096);
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}
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fclose($fd);
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/* Check if the expected string is present. */
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return array(true, strpos($fetchedPage, $probeString) !== false);
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}
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}
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?>
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