mirror of
https://github.com/EGroupware/egroupware.git
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e76f20f665
allowing to set an arbitrary uid, gid and mode for the vfs (like
mounting a dos Filesystem under Linux).
Can be used to mount eg. an upload dir writable only by Admins:
filemanger/cli.php mount --user root_admin --password whatever \
filesystem://dummy/var/www/html/uploads?group=Admins&mode=075 \
/uploads
Please note that you can NOT use filesystem:/something!
Fixed the vfs-classes to deal correctly with get-parameters used as
mount-options.
649 lines
23 KiB
PHP
649 lines
23 KiB
PHP
<?php
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/**
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* eGroupWare API: VFS - stream wrapper to access the regular filesystem (setting a given user, group and mode)
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*
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* @link http://www.egroupware.org
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package api
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* @subpackage vfs
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* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @copyright (c) 2008 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @version $Id$
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*/
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/**
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* eGroupWare API: VFS - stream wrapper to access the regular filesystem (setting a given user, group and mode)
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*
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* This stream wrapper allows to mount parts of the regular filesystem, under specified permissions.
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* You can eg. mount an directory in the docroot to allow the Admin group to upload files there.
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*
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* This stream wrapper uses query parameters to pass certain options to it:
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* - user: uid or user-name owning the path, default root
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* - group: gid or group-name owning the path, default root
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* - mode: mode bit for the path, default 0005 (read and execute for nobody)
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*
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* @link http://www.php.net/manual/en/function.stream-wrapper-register.php
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*/
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class filesystem_stream_wrapper implements iface_stream_wrapper
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{
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/**
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* Scheme / protocol used for this stream-wrapper
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*/
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const SCHEME = 'filesystem';
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/**
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* Mime type of directories, the old vfs used 'Directory', while eg. WebDAV uses 'httpd/unix-directory'
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*/
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const DIR_MIME_TYPE = egw_vfs::DIR_MIME_TYPE ;
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/**
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* mode-bits, which have to be set for files
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*/
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const MODE_FILE = 0100000;
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/**
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* mode-bits, which have to be set for directories
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*/
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const MODE_DIR = 040000;
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/**
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* optional context param when opening the stream, null if no context passed
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*
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* @var mixed
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*/
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var $context;
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/**
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* stream / ressouce this class is opened for by stream_open
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*
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* @var ressource
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*/
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private $opened_stream;
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/**
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* URL of the opened stream, used to build the complete URL of files in the dir
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*
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* @var string
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*/
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private $opened_stream_url;
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/**
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* directory-ressouce this class is opened for by dir_open
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*
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* @var ressource
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*/
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private $opened_dir;
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/**
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* URL of the opened dir, used to build the complete URL of files in the dir
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*
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* @var string
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*/
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private $opened_dir_url;
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/**
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* How much should be logged to the apache error-log
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*
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* 0 = Nothing
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* 1 = only errors
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* 2 = all function calls and errors (contains passwords too!)
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*/
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const LOG_LEVEL = 1;
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/**
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* This method is called immediately after your stream object is created.
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*
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* @param string $url URL that was passed to fopen() and that this object is expected to retrieve
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* @param string $mode mode used to open the file, as detailed for fopen()
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* @param int $options additional flags set by the streams API (or'ed together):
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* - STREAM_USE_PATH If path is relative, search for the resource using the include_path.
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* - STREAM_REPORT_ERRORS If this flag is set, you are responsible for raising errors using trigger_error() during opening of the stream.
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* If this flag is not set, you should not raise any errors.
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* @param string $opened_path full path of the file/resource, if the open was successfull and STREAM_USE_PATH was set
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* @return boolean true if the ressource was opened successful, otherwise false
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*/
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function stream_open ( $url, $mode, $options, &$opened_path )
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{
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$this->opened_stream = $this->opened_stream_url = null;
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// check access rights, based on the eGW mount perms
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if (!($stat = self::url_stat($url,0)) || $mode[0] == 'x') // file not found or file should NOT exist
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{
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$dir = egw_vfs::dirname($url);
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if ($mode[0] == 'r' || // does $mode require the file to exist (r,r+)
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$mode[0] == 'x' || // or file should not exist, but does
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!egw_vfs::check_access($dir,egw_vfs::WRITABLE,$dir_stat=self::url_stat($dir,0))) // or we are not allowed to create it
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{
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if (self::LOG_LEVEL) error_log(__METHOD__."($url,$mode,$options) file does not exist or can not be created!");
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if (!($options & STREAM_URL_STAT_QUIET))
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{
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trigger_error(__METHOD__."($url,$mode,$options) file does not exist or can not be created!",E_USER_WARNING);
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}
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return false;
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}
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}
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elseif ($mode != 'r' && !egw_vfs::check_access($url,egw_vfs::WRITABLE,$stat)) // we are not allowed to edit it
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{
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if (self::LOG_LEVEL) error_log(__METHOD__."($url,$mode,$options) file can not be edited!");
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if (!($options & STREAM_URL_STAT_QUIET))
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{
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trigger_error(__METHOD__."($url,$mode,$options) file can not be edited!",E_USER_WARNING);
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}
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return false;
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}
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// open the "real" file
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if (!($this->opened_stream = fopen(parse_url($url,PHP_URL_PATH),$mode,$options)))
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{
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return false;
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}
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$this->opened_stream_url = $url;
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return true;
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}
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/**
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* This method is called when the stream is closed, using fclose().
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*
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* You must release any resources that were locked or allocated by the stream.
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*/
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function stream_close ( )
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{
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$ret = fclose($this->opened_stream);
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$this->opened_stream = null;
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return $ret;
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}
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/**
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* This method is called in response to fread() and fgets() calls on the stream.
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*
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* You must return up-to count bytes of data from the current read/write position as a string.
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* If there are less than count bytes available, return as many as are available.
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* If no more data is available, return either FALSE or an empty string.
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* You must also update the read/write position of the stream by the number of bytes that were successfully read.
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*
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* @param int $count
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* @return string/false up to count bytes read or false on EOF
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*/
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function stream_read ( $count )
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{
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return fread($this->opened_stream,$count);
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}
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/**
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* This method is called in response to fwrite() calls on the stream.
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*
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* You should store data into the underlying storage used by your stream.
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* If there is not enough room, try to store as many bytes as possible.
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* You should return the number of bytes that were successfully stored in the stream, or 0 if none could be stored.
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* You must also update the read/write position of the stream by the number of bytes that were successfully written.
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*
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* @param string $data
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* @return integer
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*/
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function stream_write ( $data )
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{
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return fwrite($this->opened_stream,$data);
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}
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/**
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* This method is called in response to feof() calls on the stream.
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*
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* Important: PHP 5.0 introduced a bug that wasn't fixed until 5.1: the return value has to be the oposite!
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*
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* if(version_compare(PHP_VERSION,'5.0','>=') && version_compare(PHP_VERSION,'5.1','<'))
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* {
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* $eof = !$eof;
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* }
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*
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* @return boolean true if the read/write position is at the end of the stream and no more data availible, false otherwise
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*/
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function stream_eof ( )
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{
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return feof($this->opened_stream);
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}
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/**
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* This method is called in response to ftell() calls on the stream.
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*
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* @return integer current read/write position of the stream
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*/
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function stream_tell ( )
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{
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return ftell($this->opened_stream);
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}
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/**
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* This method is called in response to fseek() calls on the stream.
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*
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* You should update the read/write position of the stream according to offset and whence.
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* See fseek() for more information about these parameters.
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*
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* @param integer $offset
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* @param integer $whence SEEK_SET - Set position equal to offset bytes
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* SEEK_CUR - Set position to current location plus offset.
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* SEEK_END - Set position to end-of-file plus offset. (To move to a position before the end-of-file, you need to pass a negative value in offset.)
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* @return boolean TRUE if the position was updated, FALSE otherwise.
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*/
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function stream_seek ( $offset, $whence )
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{
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return fseek($this->opened_stream,$offset,$whence);
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}
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/**
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* This method is called in response to fflush() calls on the stream.
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*
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* If you have cached data in your stream but not yet stored it into the underlying storage, you should do so now.
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*
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* @return booelan TRUE if the cached data was successfully stored (or if there was no data to store), or FALSE if the data could not be stored.
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*/
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function stream_flush ( )
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{
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return fflush($this->opened_stream);
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}
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/**
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* This method is called in response to fstat() calls on the stream.
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*
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* If you plan to use your wrapper in a require_once you need to define stream_stat().
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* If you plan to allow any other tests like is_file()/is_dir(), you have to define url_stat().
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* stream_stat() must define the size of the file, or it will never be included.
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* url_stat() must define mode, or is_file()/is_dir()/is_executable(), and any of those functions affected by clearstatcache() simply won't work.
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* It's not documented, but directories must be a mode like 040777 (octal), and files a mode like 0100666.
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* If you wish the file to be executable, use 7s instead of 6s.
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* The last 3 digits are exactly the same thing as what you pass to chmod.
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* 040000 defines a directory, and 0100000 defines a file.
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*
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* @return array containing the same values as appropriate for the stream.
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*/
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function stream_stat ( )
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{
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return self::url_stat($this->opened_stream_url,0);
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}
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/**
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* This method is called in response to unlink() calls on URL paths associated with the wrapper.
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*
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* It should attempt to delete the item specified by path.
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* In order for the appropriate error message to be returned, do not define this method if your wrapper does not support unlinking!
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*
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* @param string $url
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* @return boolean TRUE on success or FALSE on failure
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*/
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static function unlink ( $url )
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{
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$path = parse_url($url,PHP_URL_PATH);
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// check access rights (file need to exist and directory need to be writable
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if (!file_exists($path) || is_dir($path) || !egw_vfs::check_access(egw_vfs::dirname($url),egw_vfs::WRITABLE))
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{
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if (self::LOG_LEVEL) error_log(__METHOD__."($url) permission denied!");
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return false; // no permission or file does not exist
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}
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return unlink($path);
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}
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/**
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* This method is called in response to rename() calls on URL paths associated with the wrapper.
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*
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* It should attempt to rename the item specified by path_from to the specification given by path_to.
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* In order for the appropriate error message to be returned, do not define this method if your wrapper does not support renaming.
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*
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* The regular filesystem stream-wrapper returns an error, if $url_from and $url_to are not either both files or both dirs!
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*
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* @param string $url_from
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* @param string $url_to
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* @return boolean TRUE on success or FALSE on failure
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*/
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static function rename ( $url_from, $url_to )
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{
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$from = parse_url($url_from);
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$to = parse_url($url_to);
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// check access rights
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if (!($from_stat = self::url_stat($url_from,0)) || !egw_vfs::check_access(egw_vfs::dirname($url_from),egw_vfs::WRITABLE))
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{
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if (self::LOG_LEVEL) error_log(__METHOD__."($url_from,$url_to): $path_from permission denied!");
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return false; // no permission or file does not exist
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}
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if (!egw_vfs::check_access($to_dir,egw_vfs::WRITABLE,$to_dir_stat = self::url_stat($to_dir,0)))
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{
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if (self::LOG_LEVEL) error_log(__METHOD__."($url_from,$url_to): $path_to permission denied!");
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return false; // no permission or parent-dir does not exist
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}
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// the filesystem stream-wrapper does NOT allow to rename files to directories, as this makes problems
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// for our vfs too, we abort here with an error, like the filesystem one does
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if (($to_stat = self::url_stat($path_to,0)) &&
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($to_stat['mime'] === self::DIR_MIME_TYPE) !== ($from_stat['mime'] === self::DIR_MIME_TYPE))
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{
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$is_dir = $to_stat['mime'] === self::DIR_MIME_TYPE ? 'a' : 'no';
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if (self::LOG_LEVEL) error_log(__METHOD__."($url_to,$url_from) $path_to is $is_dir directory!");
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return false; // no permission or file does not exist
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}
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// if destination file already exists, delete it
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if ($to_stat && !self::unlink($url_to,$operation))
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{
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if (self::LOG_LEVEL) error_log(__METHOD__."($url_to,$url_from) can't unlink existing $url_to!");
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return false;
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}
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return rename($from['path'],$to['path']);
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}
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/**
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* This method is called in response to mkdir() calls on URL paths associated with the wrapper.
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*
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* It should attempt to create the directory specified by path.
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* In order for the appropriate error message to be returned, do not define this method if your wrapper does not support creating directories.
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*
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* @param string $url
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* @param int $mode not used, as we dont allow to change mode
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* @param int $options Posible values include STREAM_REPORT_ERRORS and STREAM_MKDIR_RECURSIVE
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* @return boolean TRUE on success or FALSE on failure
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*/
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static function mkdir ( $url, $mode, $options )
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{
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$path = parse_url($url,PHP_URL_PATH);
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$recursive = (bool)($options & STREAM_MKDIR_RECURSIVE);
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// find the real parent (might be more then one level if $recursive!)
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do {
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$parent = dirname($parent ? $parent : $path);
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$parent_url = egw_vfs::dirname($parent_url ? $parent_url : $url);
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}
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while ($recursive && $parent != '/' && !file_exists($parent));
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//echo __METHOD__."($url,$mode,$options) path=$path, recursive=$recursive, parent=$parent, egw_vfs::check_access(parent_url=$parent_url,egw_vfs::WRITABLE)=".(int)egw_vfs::check_access($parent_url,egw_vfs::WRITABLE)."\n";
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// check access rights (in real filesystem AND by mount perms)
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if (file_exists($path) || !file_exists($parent) || !is_writable($parent) || !egw_vfs::check_access($parent_url,egw_vfs::WRITABLE))
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{
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if (self::LOG_LEVEL) error_log(__METHOD__."($url) permission denied!");
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return false;
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}
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return mkdir($path,$mode=0700,$recursive); // setting mode 0700 allows (only) apache to write into the dir
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}
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/**
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* This method is called in response to rmdir() calls on URL paths associated with the wrapper.
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*
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* It should attempt to remove the directory specified by path.
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* In order for the appropriate error message to be returned, do not define this method if your wrapper does not support removing directories.
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*
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* @param string $url
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* @param int $options Possible values include STREAM_REPORT_ERRORS.
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* @return boolean TRUE on success or FALSE on failure.
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*/
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static function rmdir ( $url, $options )
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{
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$path = parse_url($url,PHP_URL_PATH);
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$parent = dirname($path);
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// check access rights (in real filesystem AND by mount perms)
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if (!file_exists($path) || !is_writable($parent) || !egw_vfs::check_access(egw_vfs::dirname($url),egw_vfs::WRITABLE))
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{
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if (self::LOG_LEVEL) error_log(__METHOD__."($url) permission denied!");
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return false;
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}
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return rmdir($path);
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}
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/**
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* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
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*
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* @param string $path
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* @param int $time=null modification time (unix timestamp), default null = current time
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* @param int $atime=null access time (unix timestamp), default null = current time, not implemented in the vfs!
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* @return boolean true on success, false otherwise
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*/
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static function touch($url,$time=null,$atime=null)
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{
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$path = parse_url($url,PHP_URL_PATH);
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$parent = dirname($path);
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// check access rights (in real filesystem AND by mount perms)
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if (!file_exists($path) || !is_writable($parent) || !egw_vfs::check_access(egw_vfs::dirname($url),egw_vfs::WRITABLE))
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{
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if (self::LOG_LEVEL) error_log(__METHOD__."($url) permission denied!");
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return false;
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}
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return touch($path,$time,$atime);
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}
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/**
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* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
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*
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* Not supported, as it would require root rights!
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*
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* @param string $path
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* @param string $mode mode string see egw_vfs::mode2int
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* @return boolean true on success, false otherwise
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*/
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static function chmod($path,$mode)
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{
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return false;
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}
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/**
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* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
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*
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* Not supported, as it would require root rights!
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*
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* @param string $path
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* @param int $owner numeric user id
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* @return boolean true on success, false otherwise
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*/
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static function chown($path,$owner)
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{
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return false;
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}
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/**
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* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
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*
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* Not supported, as it would require root rights!
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*
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* @param string $path
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* @param int $group numeric group id
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* @return boolean true on success, false otherwise
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*/
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static function chgrp($path,$group)
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{
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return false;
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}
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/**
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* This method is called immediately when your stream object is created for examining directory contents with opendir().
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*
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* @param string $url URL that was passed to opendir() and that this object is expected to explore.
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* @param int $options
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* @return booelan
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*/
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function dir_opendir ( $url, $options )
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{
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error_log(__METHOD__."($url,$options)");
|
|
|
|
$this->opened_dir = null;
|
|
|
|
$parts = parse_url($this->opened_dir_url = $url);
|
|
|
|
// ToDo: check access rights
|
|
|
|
if (!($this->opened_dir = opendir($parts['path'])))
|
|
{
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* This method is called in response to stat() calls on the URL paths associated with the wrapper.
|
|
*
|
|
* It should return as many elements in common with the system function as possible.
|
|
* Unknown or unavailable values should be set to a rational value (usually 0).
|
|
*
|
|
* If you plan to use your wrapper in a require_once you need to define stream_stat().
|
|
* If you plan to allow any other tests like is_file()/is_dir(), you have to define url_stat().
|
|
* stream_stat() must define the size of the file, or it will never be included.
|
|
* url_stat() must define mode, or is_file()/is_dir()/is_executable(), and any of those functions affected by clearstatcache() simply won't work.
|
|
* It's not documented, but directories must be a mode like 040777 (octal), and files a mode like 0100666.
|
|
* If you wish the file to be executable, use 7s instead of 6s.
|
|
* The last 3 digits are exactly the same thing as what you pass to chmod.
|
|
* 040000 defines a directory, and 0100000 defines a file.
|
|
*
|
|
* @param string $url
|
|
* @param int $flags holds additional flags set by the streams API. It can hold one or more of the following values OR'd together:
|
|
* - STREAM_URL_STAT_LINK For resources with the ability to link to other resource (such as an HTTP Location: forward,
|
|
* or a filesystem symlink). This flag specified that only information about the link itself should be returned,
|
|
* not the resource pointed to by the link.
|
|
* This flag is set in response to calls to lstat(), is_link(), or filetype().
|
|
* - STREAM_URL_STAT_QUIET If this flag is set, your wrapper should not raise any errors. If this flag is not set,
|
|
* you are responsible for reporting errors using the trigger_error() function during stating of the path.
|
|
* stat triggers it's own warning anyway, so it makes no sense to trigger one by our stream-wrapper!
|
|
* @return array
|
|
*/
|
|
static function url_stat ( $url, $flags )
|
|
{
|
|
$parts = parse_url($url);
|
|
|
|
//error_log(__METHOD__."('$path',$flags) calling stat($url)");
|
|
$stat = @stat($parts['path']); // suppressed the stat failed warnings
|
|
|
|
if ($stat)
|
|
{
|
|
// set owner, group and mode from mount options
|
|
if (!self::parse_query($parts['query'],$uid,$gid,$mode))
|
|
{
|
|
return false;
|
|
}
|
|
$stat['uid'] = $stat[4] = $uid;
|
|
$stat['gid'] = $stat[5] = $gid;
|
|
$stat['mode'] = $stat[2] = $stat['mode'] & self::MODE_DIR ? self::MODE_DIR | $mode : self::MODE_FILE | ($mode & ~0111);
|
|
}
|
|
//echo __METHOD__."($url,$flags) path=$parts[path], mount_mode=".sprintf('0%o',$mode).", mode=".sprintf('0%o',$stat['mode']).'='.egw_vfs::int2mode($stat['mode'])."\n"; //print_r($stat);
|
|
return $stat;
|
|
}
|
|
|
|
/**
|
|
* This method is called in response to readdir().
|
|
*
|
|
* It should return a string representing the next filename in the location opened by dir_opendir().
|
|
*
|
|
* Unless other filesystem, we only return files readable by the user, if the dir is not writable for him.
|
|
* This is done to hide files and dirs not accessible by the user (eg. other peoples home-dirs in /home).
|
|
*
|
|
* @return string
|
|
*/
|
|
function dir_readdir ( )
|
|
{
|
|
return readdir($this->opened_dir);
|
|
}
|
|
|
|
/**
|
|
* This method is called in response to rewinddir().
|
|
*
|
|
* It should reset the output generated by dir_readdir(). i.e.:
|
|
* The next call to dir_readdir() should return the first entry in the location returned by dir_opendir().
|
|
*
|
|
* @return boolean
|
|
*/
|
|
function dir_rewinddir ( )
|
|
{
|
|
return rewinddir($this->opened_dir);
|
|
}
|
|
|
|
/**
|
|
* This method is called in response to closedir().
|
|
*
|
|
* You should release any resources which were locked or allocated during the opening and use of the directory stream.
|
|
*
|
|
* @return boolean
|
|
*/
|
|
function dir_closedir ( )
|
|
{
|
|
$ret = closedir($this->opened_dir);
|
|
|
|
$this->opened_dir = $this->extra_dirs = null;
|
|
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* parse a query containing mount parameters: user, uid, group, gid or mode
|
|
*
|
|
* @param string|array $query query string or array returned by parse_url (key 'query' holds the value)
|
|
* @param int &$uid default if not set is 0=root
|
|
* @param int &$gid default if not set is 0=root
|
|
* @param int &$mode default if not set is 05 r-x for others
|
|
* @return boolean true on successfull parse, false on error
|
|
*/
|
|
static function parse_query($query,&$uid,&$gid,&$mode)
|
|
{
|
|
parse_str(is_array($query) ? $query['query'] : $query,$params);
|
|
|
|
// setting the default perms root.root r-x for other
|
|
$uid = $gid = 0;
|
|
$mode = 05;
|
|
|
|
foreach($params as $name => $value)
|
|
{
|
|
switch($name)
|
|
{
|
|
case 'user':
|
|
if (!is_numeric($value))
|
|
{
|
|
if ($name === 'root')
|
|
{
|
|
$value = 0;
|
|
}
|
|
elseif (($value = $GLOBALS['egw']->accounts->name2id($value,'account_lid','u')) === false)
|
|
{
|
|
error_log(__METHOD__."('$query') unknown user-name '$value'!");
|
|
return false; // wrong user-name
|
|
}
|
|
}
|
|
// fall-through
|
|
case 'uid':
|
|
if (!is_numeric($value) || $value < 0 || !is_int($value) && !$GLOBALS['egw']->accounts->id2name($value))
|
|
{
|
|
error_log(__METHOD__."('$query') wrong numeric user-id '$value'!");
|
|
return false;
|
|
}
|
|
$uid = (int)$value;
|
|
break;
|
|
case 'group':
|
|
if (!is_numeric($value))
|
|
{
|
|
if ($name === 'root')
|
|
{
|
|
$value = 0;
|
|
}
|
|
elseif (($value = $GLOBALS['egw']->accounts->name2id($value,'account_lid','g')) === false)
|
|
{
|
|
error_log(__METHOD__."('$query') unknown group-name '$value'!");
|
|
return false; // wrong group-name
|
|
}
|
|
$value = -$value; // vfs uses positiv gid's!
|
|
}
|
|
// fall-through
|
|
case 'gid':
|
|
if (!is_numeric($value) || $value < 0 || !is_int($value) && !$GLOBALS['egw']->accounts->id2name(-$value))
|
|
{
|
|
error_log(__METHOD__."('$query') wrong numeric group-id '$value'!");
|
|
return false;
|
|
}
|
|
$gid = (int)$value;
|
|
break;
|
|
case 'mode':
|
|
$mode = egw_vfs::mode2int($value);
|
|
break;
|
|
default:
|
|
error_log(__METHOD__."('$query') unknown option '$name'!");
|
|
break;
|
|
}
|
|
}
|
|
//echo __METHOD__.'('.print_r($query,true).") uid=$uid, gid=$gid, mode=".sprintf('0%o',$mode)."\n";
|
|
return true;
|
|
}
|
|
}
|
|
|
|
stream_register_wrapper(filesystem_stream_wrapper::SCHEME ,'filesystem_stream_wrapper');
|