655 lines
21 KiB
PHP
Executable File
655 lines
21 KiB
PHP
Executable File
<?php
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/**
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* Class for utility functions
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*
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*/
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class OC_Util {
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public static $scripts=array();
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public static $styles=array();
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public static $headers=array();
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private static $rootMounted=false;
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private static $fsSetup=false;
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public static $core_styles=array();
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public static $core_scripts=array();
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// Can be set up
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public static function setupFS( $user = '' ) {// configure the initial filesystem based on the configuration
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if(self::$fsSetup) {//setting up the filesystem twice can only lead to trouble
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return false;
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}
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// If we are not forced to load a specific user we load the one that is logged in
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if( $user == "" && OC_User::isLoggedIn()) {
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$user = OC_User::getUser();
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}
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// the filesystem will finish when $user is not empty,
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// mark fs setup here to avoid doing the setup from loading
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// OC_Filesystem
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if ($user != '') {
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self::$fsSetup=true;
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}
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$CONFIG_DATADIRECTORY = OC_Config::getValue( "datadirectory", OC::$SERVERROOT."/data" );
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//first set up the local "root" storage
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if(!self::$rootMounted) {
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OC_Filesystem::mount('OC_Filestorage_Local',array('datadir'=>$CONFIG_DATADIRECTORY),'/');
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self::$rootMounted=true;
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}
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if( $user != "" ) { //if we aren't logged in, there is no use to set up the filesystem
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$user_dir = '/'.$user.'/files';
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$user_root = OC_User::getHome($user);
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$userdirectory = $user_root . '/files';
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if( !is_dir( $userdirectory )) {
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mkdir( $userdirectory, 0755, true );
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}
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//jail the user into his "home" directory
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OC_Filesystem::mount('OC_Filestorage_Local', array('datadir' => $user_root), $user);
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OC_Filesystem::init($user_dir);
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$quotaProxy=new OC_FileProxy_Quota();
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$fileOperationProxy = new OC_FileProxy_FileOperations();
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OC_FileProxy::register($quotaProxy);
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OC_FileProxy::register($fileOperationProxy);
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// Load personal mount config
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if (is_file($user_root.'/mount.php')) {
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$mountConfig = include($user_root.'/mount.php');
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if (isset($mountConfig['user'][$user])) {
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foreach ($mountConfig['user'][$user] as $mountPoint => $options) {
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OC_Filesystem::mount($options['class'], $options['options'], $mountPoint);
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}
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}
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$mtime=filemtime($user_root.'/mount.php');
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$previousMTime=OC_Preferences::getValue($user,'files','mountconfigmtime',0);
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if($mtime>$previousMTime) {//mount config has changed, filecache needs to be updated
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OC_FileCache::triggerUpdate($user);
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OC_Preferences::setValue($user,'files','mountconfigmtime',$mtime);
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}
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}
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OC_Hook::emit('OC_Filesystem', 'setup', array('user' => $user, 'user_dir' => $user_dir));
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}
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}
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public static function tearDownFS() {
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OC_Filesystem::tearDown();
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self::$fsSetup=false;
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}
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/**
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* get the current installed version of ownCloud
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* @return array
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*/
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public static function getVersion() {
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// hint: We only can count up. So the internal version number of ownCloud 4.5 will be 4.90.0. This is not visible to the user
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return array(4,91,00);
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}
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/**
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* get the current installed version string of ownCloud
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* @return string
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*/
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public static function getVersionString() {
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return '5.0 pre alpha';
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}
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/**
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* get the current installed edition of ownCloud. There is the community edition that just returns an empty string and the enterprise edition that returns "Enterprise".
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* @return string
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*/
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public static function getEditionString() {
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return '';
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}
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/**
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* add a javascript file
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*
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* @param appid $application
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* @param filename $file
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*/
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public static function addScript( $application, $file = null ) {
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if( is_null( $file )) {
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$file = $application;
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$application = "";
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}
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if( !empty( $application )) {
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self::$scripts[] = "$application/js/$file";
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}else{
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self::$scripts[] = "js/$file";
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}
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}
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/**
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* add a css file
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*
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* @param appid $application
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* @param filename $file
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*/
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public static function addStyle( $application, $file = null ) {
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if( is_null( $file )) {
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$file = $application;
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$application = "";
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}
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if( !empty( $application )) {
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self::$styles[] = "$application/css/$file";
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}else{
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self::$styles[] = "css/$file";
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}
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}
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/**
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* @brief Add a custom element to the header
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* @param string tag tag name of the element
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* @param array $attributes array of attributes for the element
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* @param string $text the text content for the element
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*/
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public static function addHeader( $tag, $attributes, $text='') {
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self::$headers[]=array('tag'=>$tag,'attributes'=>$attributes,'text'=>$text);
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}
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/**
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* formats a timestamp in the "right" way
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*
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* @param int timestamp $timestamp
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* @param bool dateOnly option to ommit time from the result
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*/
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public static function formatDate( $timestamp,$dateOnly=false) {
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if(isset($_SESSION['timezone'])) {//adjust to clients timezone if we know it
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$systemTimeZone = intval(date('O'));
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$systemTimeZone=(round($systemTimeZone/100,0)*60)+($systemTimeZone%100);
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$clientTimeZone=$_SESSION['timezone']*60;
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$offset=$clientTimeZone-$systemTimeZone;
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$timestamp=$timestamp+$offset*60;
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}
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$l=OC_L10N::get('lib');
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return $l->l($dateOnly ? 'date' : 'datetime', $timestamp);
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}
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/**
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* Shows a pagenavi widget where you can jump to different pages.
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*
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* @param int $pagecount
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* @param int $page
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* @param string $url
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* @return OC_Template
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*/
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public static function getPageNavi($pagecount,$page,$url) {
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$pagelinkcount=8;
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if ($pagecount>1) {
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$pagestart=$page-$pagelinkcount;
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if($pagestart<0) $pagestart=0;
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$pagestop=$page+$pagelinkcount;
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if($pagestop>$pagecount) $pagestop=$pagecount;
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$tmpl = new OC_Template( '', 'part.pagenavi', '' );
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$tmpl->assign('page',$page);
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$tmpl->assign('pagecount',$pagecount);
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$tmpl->assign('pagestart',$pagestart);
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$tmpl->assign('pagestop',$pagestop);
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$tmpl->assign('url',$url);
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return $tmpl;
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}
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}
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/**
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* check if the current server configuration is suitable for ownCloud
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* @return array arrays with error messages and hints
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*/
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public static function checkServer() {
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$errors=array();
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$web_server_restart= false;
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//check for database drivers
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if(!(is_callable('sqlite_open') or class_exists('SQLite3')) and !is_callable('mysql_connect') and !is_callable('pg_connect')) {
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$errors[]=array('error'=>'No database drivers (sqlite, mysql, or postgresql) installed.<br/>','hint'=>'');//TODO: sane hint
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$web_server_restart= true;
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}
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//common hint for all file permissons error messages
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$permissionsHint="Permissions can usually be fixed by giving the webserver write access to the ownCloud directory";
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// Check if config folder is writable.
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if(!is_writable(OC::$SERVERROOT."/config/") or !is_readable(OC::$SERVERROOT."/config/")) {
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$errors[]=array('error'=>"Can't write into config directory 'config'",'hint'=>"You can usually fix this by giving the webserver user write access to the config directory in owncloud");
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}
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// Check if there is a writable install folder.
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if(OC_Config::getValue('appstoreenabled', true)) {
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if( OC_App::getInstallPath() === null || !is_writable(OC_App::getInstallPath()) || !is_readable(OC_App::getInstallPath()) ) {
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$errors[]=array('error'=>"Can't write into apps directory",'hint'=>"You can usually fix this by giving the webserver user write access to the apps directory
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in owncloud or disabling the appstore in the config file.");
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}
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}
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$CONFIG_DATADIRECTORY = OC_Config::getValue( "datadirectory", OC::$SERVERROOT."/data" );
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//check for correct file permissions
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if(!stristr(PHP_OS, 'WIN')) {
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$permissionsModHint="Please change the permissions to 0770 so that the directory cannot be listed by other users.";
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$prems=substr(decoct(@fileperms($CONFIG_DATADIRECTORY)),-3);
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if(substr($prems,-1)!='0') {
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OC_Helper::chmodr($CONFIG_DATADIRECTORY,0770);
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clearstatcache();
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$prems=substr(decoct(@fileperms($CONFIG_DATADIRECTORY)),-3);
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if(substr($prems,2,1)!='0') {
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$errors[]=array('error'=>'Data directory ('.$CONFIG_DATADIRECTORY.') is readable for other users<br/>','hint'=>$permissionsModHint);
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}
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}
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if( OC_Config::getValue( "enablebackup", false )) {
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$CONFIG_BACKUPDIRECTORY = OC_Config::getValue( "backupdirectory", OC::$SERVERROOT."/backup" );
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$prems=substr(decoct(@fileperms($CONFIG_BACKUPDIRECTORY)),-3);
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if(substr($prems,-1)!='0') {
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OC_Helper::chmodr($CONFIG_BACKUPDIRECTORY,0770);
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clearstatcache();
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$prems=substr(decoct(@fileperms($CONFIG_BACKUPDIRECTORY)),-3);
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if(substr($prems,2,1)!='0') {
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$errors[]=array('error'=>'Data directory ('.$CONFIG_BACKUPDIRECTORY.') is readable for other users<br/>','hint'=>$permissionsModHint);
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}
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}
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}
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}else{
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//TODO: permissions checks for windows hosts
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}
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// Create root dir.
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if(!is_dir($CONFIG_DATADIRECTORY)) {
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$success=@mkdir($CONFIG_DATADIRECTORY);
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if(!$success) {
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$errors[]=array('error'=>"Can't create data directory (".$CONFIG_DATADIRECTORY.")",'hint'=>"You can usually fix this by giving the webserver write access to the ownCloud directory '".OC::$SERVERROOT."' (in a terminal, use the command 'chown -R www-data:www-data /path/to/your/owncloud/install/data' ");
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}
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} else if(!is_writable($CONFIG_DATADIRECTORY) or !is_readable($CONFIG_DATADIRECTORY)) {
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$errors[]=array('error'=>'Data directory ('.$CONFIG_DATADIRECTORY.') not writable by ownCloud<br/>','hint'=>$permissionsHint);
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}
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// check if all required php modules are present
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if(!class_exists('ZipArchive')) {
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$errors[]=array('error'=>'PHP module zip not installed.<br/>','hint'=>'Please ask your server administrator to install the module.');
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$web_server_restart= false;
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}
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if(!function_exists('mb_detect_encoding')) {
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$errors[]=array('error'=>'PHP module mb multibyte not installed.<br/>','hint'=>'Please ask your server administrator to install the module.');
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$web_server_restart= false;
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}
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if(!function_exists('ctype_digit')) {
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$errors[]=array('error'=>'PHP module ctype is not installed.<br/>','hint'=>'Please ask your server administrator to install the module.');
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$web_server_restart= false;
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}
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if(!function_exists('json_encode')) {
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$errors[]=array('error'=>'PHP module JSON is not installed.<br/>','hint'=>'Please ask your server administrator to install the module.');
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$web_server_restart= false;
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}
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if(!function_exists('imagepng')) {
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$errors[]=array('error'=>'PHP module GD is not installed.<br/>','hint'=>'Please ask your server administrator to install the module.');
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$web_server_restart= false;
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}
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if(!function_exists('gzencode')) {
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$errors[]=array('error'=>'PHP module zlib is not installed.<br/>','hint'=>'Please ask your server administrator to install the module.');
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$web_server_restart= false;
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}
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if(!function_exists('simplexml_load_string')) {
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$errors[]=array('error'=>'PHP module SimpleXML is not installed.<br/>','hint'=>'Please ask your server administrator to install the module.');
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$web_server_restart= false;
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}
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if(floatval(phpversion())<5.3) {
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$errors[]=array('error'=>'PHP 5.3 is required.<br/>','hint'=>'Please ask your server administrator to update PHP to version 5.3 or higher. PHP 5.2 is no longer supported by ownCloud and the PHP community.');
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$web_server_restart= false;
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}
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if(!defined('PDO::ATTR_DRIVER_NAME')) {
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$errors[]=array('error'=>'PHP PDO module is not installed.<br/>','hint'=>'Please ask your server administrator to install the module.');
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$web_server_restart= false;
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}
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if($web_server_restart) {
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$errors[]=array('error'=>'PHP modules have been installed, but they are still listed as missing?<br/>','hint'=>'Please ask your server administrator to restart the web server.');
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}
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return $errors;
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}
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public static function displayLoginPage($errors = array()) {
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$parameters = array();
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foreach( $errors as $key => $value ) {
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$parameters[$value] = true;
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}
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if (!empty($_POST['user'])) {
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$parameters["username"] =
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OC_Util::sanitizeHTML($_POST['user']).'"';
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$parameters['user_autofocus'] = false;
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} else {
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$parameters["username"] = '';
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$parameters['user_autofocus'] = true;
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}
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if (isset($_REQUEST['redirect_url'])) {
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$redirect_url = OC_Util::sanitizeHTML($_REQUEST['redirect_url']);
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} else {
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$redirect_url = $_SERVER['REQUEST_URI'];
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}
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$parameters['redirect_url'] = $redirect_url;
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OC_Template::printGuestPage("", "login", $parameters);
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}
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/**
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* Check if the app is enabled, redirects to home if not
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*/
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public static function checkAppEnabled($app) {
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if( !OC_App::isEnabled($app)) {
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header( 'Location: '.OC_Helper::linkToAbsolute( '', 'index.php' ));
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exit();
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}
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}
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/**
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* Check if the user is logged in, redirects to home if not. With
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* redirect URL parameter to the request URI.
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*/
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public static function checkLoggedIn() {
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// Check if we are a user
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if( !OC_User::isLoggedIn()) {
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header( 'Location: '.OC_Helper::linkToAbsolute( '', 'index.php', array('redirect_url' => $_SERVER["REQUEST_URI"])));
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exit();
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}
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}
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/**
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* Check if the user is a admin, redirects to home if not
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*/
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public static function checkAdminUser() {
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// Check if we are a user
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self::checkLoggedIn();
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self::verifyUser();
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if( !OC_Group::inGroup( OC_User::getUser(), 'admin' )) {
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header( 'Location: '.OC_Helper::linkToAbsolute( '', 'index.php' ));
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exit();
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}
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}
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/**
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* Check if the user is a subadmin, redirects to home if not
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* @return array $groups where the current user is subadmin
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*/
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public static function checkSubAdminUser() {
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// Check if we are a user
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self::checkLoggedIn();
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self::verifyUser();
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if(OC_Group::inGroup(OC_User::getUser(),'admin')) {
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return true;
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}
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if(!OC_SubAdmin::isSubAdmin(OC_User::getUser())) {
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header( 'Location: '.OC_Helper::linkToAbsolute( '', 'index.php' ));
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exit();
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}
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return true;
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}
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/**
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* Check if the user verified the login with his password in the last 15 minutes
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* If not, the user will be shown a password verification page
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*/
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public static function verifyUser() {
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if(OC_Config::getValue('enhancedauth', true) === true) {
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// Check password to set session
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if(isset($_POST['password'])) {
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if (OC_User::login(OC_User::getUser(), $_POST["password"] ) === true) {
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$_SESSION['verifiedLogin']=time() + OC_Config::getValue('enhancedauthtime', 15 * 60);
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}
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}
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// Check if the user verified his password
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if(!isset($_SESSION['verifiedLogin']) OR $_SESSION['verifiedLogin'] < time()) {
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OC_Template::printGuestPage("", "verify", array('username' => OC_User::getUser()));
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exit();
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}
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}
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}
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/**
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* Check if the user verified the login with his password
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* @return bool
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*/
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public static function isUserVerified() {
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if(OC_Config::getValue('enhancedauth', true) === true) {
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if(!isset($_SESSION['verifiedLogin']) OR $_SESSION['verifiedLogin'] < time()) {
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return false;
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}
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return true;
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}
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}
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/**
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* Redirect to the user default page
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*/
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public static function redirectToDefaultPage() {
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if(isset($_REQUEST['redirect_url']) && (substr($_REQUEST['redirect_url'], 0, strlen(OC::$WEBROOT)) == OC::$WEBROOT || $_REQUEST['redirect_url'][0] == '/')) {
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$location = $_REQUEST['redirect_url'];
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}
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else if (isset(OC::$REQUESTEDAPP) && !empty(OC::$REQUESTEDAPP)) {
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$location = OC_Helper::linkToAbsolute( OC::$REQUESTEDAPP, 'index.php' );
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}
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else {
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$defaultpage = OC_Appconfig::getValue('core', 'defaultpage');
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if ($defaultpage) {
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$location = OC_Helper::makeURLAbsolute(OC::$WEBROOT.'/'.$defaultpage);
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}
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else {
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$location = OC_Helper::linkToAbsolute( 'files', 'index.php' );
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}
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}
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OC_Log::write('core', 'redirectToDefaultPage: '.$location, OC_Log::DEBUG);
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header( 'Location: '.$location );
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exit();
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}
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/**
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* get an id unqiue for this instance
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* @return string
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*/
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public static function getInstanceId() {
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$id=OC_Config::getValue('instanceid',null);
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if(is_null($id)) {
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$id=uniqid();
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OC_Config::setValue('instanceid',$id);
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}
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return $id;
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}
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/**
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* @brief Static lifespan (in seconds) when a request token expires.
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* @see OC_Util::callRegister()
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* @see OC_Util::isCallRegistered()
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* @description
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* Also required for the client side to compute the piont in time when to
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* request a fresh token. The client will do so when nearly 97% of the
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* timespan coded here has expired.
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*/
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public static $callLifespan = 3600; // 3600 secs = 1 hour
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/**
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* @brief Register an get/post call. Important to prevent CSRF attacks.
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* @todo Write howto: CSRF protection guide
|
|
* @return $token Generated token.
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* @description
|
|
* Creates a 'request token' (random) and stores it inside the session.
|
|
* Ever subsequent (ajax) request must use such a valid token to succeed,
|
|
* otherwise the request will be denied as a protection against CSRF.
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* The tokens expire after a fixed lifespan.
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|
* @see OC_Util::$callLifespan
|
|
* @see OC_Util::isCallRegistered()
|
|
*/
|
|
public static function callRegister() {
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|
// generate a random token.
|
|
$token = self::generate_random_bytes(20);
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|
|
|
// store the token together with a timestamp in the session.
|
|
$_SESSION['requesttoken-'.$token]=time();
|
|
|
|
// cleanup old tokens garbage collector
|
|
// only run every 20th time so we don't waste cpu cycles
|
|
if(rand(0,20)==0) {
|
|
foreach($_SESSION as $key=>$value) {
|
|
// search all tokens in the session
|
|
if(substr($key,0,12)=='requesttoken') {
|
|
// check if static lifespan has expired
|
|
if($value+self::$callLifespan<time()) {
|
|
// remove outdated tokens
|
|
unset($_SESSION[$key]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// return the token
|
|
return($token);
|
|
}
|
|
|
|
/**
|
|
* @brief Check an ajax get/post call if the request token is valid.
|
|
* @return boolean False if request token is not set or is invalid.
|
|
* @see OC_Util::$callLifespan
|
|
* @see OC_Util::calLRegister()
|
|
*/
|
|
public static function isCallRegistered() {
|
|
if(isset($_GET['requesttoken'])) {
|
|
$token=$_GET['requesttoken'];
|
|
}elseif(isset($_POST['requesttoken'])) {
|
|
$token=$_POST['requesttoken'];
|
|
}elseif(isset($_SERVER['HTTP_REQUESTTOKEN'])) {
|
|
$token=$_SERVER['HTTP_REQUESTTOKEN'];
|
|
}else{
|
|
//no token found.
|
|
return false;
|
|
}
|
|
if(isset($_SESSION['requesttoken-'.$token])) {
|
|
$timestamp=$_SESSION['requesttoken-'.$token];
|
|
// check if static lifespan has expired
|
|
if($timestamp+self::$callLifespan<time()) {
|
|
return false;
|
|
}else{
|
|
//token valid
|
|
return true;
|
|
}
|
|
}else{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Check an ajax get/post call if the request token is valid. exit if not.
|
|
* Todo: Write howto
|
|
*/
|
|
public static function callCheck() {
|
|
if(!OC_Util::isCallRegistered()) {
|
|
exit;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Public function to sanitize HTML
|
|
*
|
|
* This function is used to sanitize HTML and should be applied on any
|
|
* string or array of strings before displaying it on a web page.
|
|
*
|
|
* @param string or array of strings
|
|
* @return array with sanitized strings or a single sanitized string, depends on the input parameter.
|
|
*/
|
|
public static function sanitizeHTML( &$value ) {
|
|
if (is_array($value) || is_object($value)) array_walk_recursive($value,'OC_Util::sanitizeHTML');
|
|
else $value = htmlentities($value, ENT_QUOTES, 'UTF-8'); //Specify encoding for PHP<5.4
|
|
return $value;
|
|
}
|
|
|
|
|
|
/**
|
|
* Check if the htaccess file is working by creating a test file in the data directory and trying to access via http
|
|
*/
|
|
public static function ishtaccessworking() {
|
|
// testdata
|
|
$filename='/htaccesstest.txt';
|
|
$testcontent='testcontent';
|
|
|
|
// creating a test file
|
|
$testfile = OC_Config::getValue( "datadirectory", OC::$SERVERROOT."/data" ).'/'.$filename;
|
|
$fp = @fopen($testfile, 'w');
|
|
@fwrite($fp, $testcontent);
|
|
@fclose($fp);
|
|
|
|
// accessing the file via http
|
|
$url = OC_Helper::makeURLAbsolute(OC::$WEBROOT.'/data'.$filename);
|
|
$fp = @fopen($url, 'r');
|
|
$content=@fread($fp, 2048);
|
|
@fclose($fp);
|
|
|
|
// cleanup
|
|
@unlink($testfile);
|
|
|
|
// does it work ?
|
|
if($content==$testcontent) {
|
|
return(false);
|
|
}else{
|
|
return(true);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Generates a cryptographical secure pseudorandom string
|
|
* @param Int with the length of the random string
|
|
* @return String
|
|
* Please also update secureRNG_available if you change something here
|
|
*/
|
|
public static function generate_random_bytes($length = 30) {
|
|
|
|
// Try to use openssl_random_pseudo_bytes
|
|
if(function_exists('openssl_random_pseudo_bytes')) {
|
|
$pseudo_byte = bin2hex(openssl_random_pseudo_bytes($length, $strong));
|
|
if($strong == TRUE) {
|
|
return substr($pseudo_byte, 0, $length); // Truncate it to match the length
|
|
}
|
|
}
|
|
|
|
// Try to use /dev/urandom
|
|
$fp = @file_get_contents('/dev/urandom', false, null, 0, $length);
|
|
if ($fp !== FALSE) {
|
|
$string = substr(bin2hex($fp), 0, $length);
|
|
return $string;
|
|
}
|
|
|
|
// Fallback to mt_rand()
|
|
$characters = '0123456789';
|
|
$characters .= 'abcdefghijklmnopqrstuvwxyz';
|
|
$charactersLength = strlen($characters)-1;
|
|
$pseudo_byte = "";
|
|
|
|
// Select some random characters
|
|
for ($i = 0; $i < $length; $i++) {
|
|
$pseudo_byte .= $characters[mt_rand(0, $charactersLength)];
|
|
}
|
|
return $pseudo_byte;
|
|
}
|
|
|
|
/**
|
|
* @brief Checks if a secure random number generator is available
|
|
* @return bool
|
|
*/
|
|
public static function secureRNG_available() {
|
|
|
|
// Check openssl_random_pseudo_bytes
|
|
if(function_exists('openssl_random_pseudo_bytes')) {
|
|
openssl_random_pseudo_bytes(1, $strong);
|
|
if($strong == TRUE) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// Check /dev/urandom
|
|
$fp = @file_get_contents('/dev/urandom', false, null, 0, 1);
|
|
if ($fp !== FALSE) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
}
|