<?php

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/**

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* Pure-PHP implementation of SFTP.

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*

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* PHP versions 4 and 5

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*

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* Currently only supports SFTPv2 and v3, which, according to wikipedia.org, "is the most widely used version,

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* implemented by the popular OpenSSH SFTP server". If you want SFTPv4/5/6 support, provide me with access

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* to an SFTPv4/5/6 server.

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*

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* The API for this library is modeled after the API from PHP's {@link http://php.net/book.ftp FTP extension}.

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*

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* Here's a short example of how to use this library:

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* <code>

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* <?php

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* include 'Net/SFTP.php';

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*

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* $sftp = new Net_SFTP('www.domain.tld');

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* if (!$sftp->login('username', 'password')) {

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* exit('Login Failed');

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* }

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*

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* echo $sftp->pwd() . "\r\n";

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* $sftp->put('filename.ext', 'hello, world!');

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* print_r($sftp->nlist());

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* ?>

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* </code>

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*

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* LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy

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* of this software and associated documentation files (the "Software"), to deal

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* in the Software without restriction, including without limitation the rights

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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

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* copies of the Software, and to permit persons to whom the Software is

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* furnished to do so, subject to the following conditions:

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*

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* The above copyright notice and this permission notice shall be included in

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* all copies or substantial portions of the Software.

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*

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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

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* THE SOFTWARE.

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*

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* @category Net

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* @package Net_SFTP

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* @author Jim Wigginton <terrafrost@php.net>

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* @copyright MMIX Jim Wigginton

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* @license http://www.opensource.org/licenses/mit-license.html MIT License

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* @link http://phpseclib.sourceforge.net

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*/

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/**

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* Include Net_SSH2

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*/

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if (!class_exists('Net_SSH2')) {

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require_once dirname(__FILE__).'/SSH2.php';

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}

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/**#@+

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* @access public

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* @see Net_SFTP::getLog()

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*/

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/**

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* Returns the message numbers

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*/

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define('NET_SFTP_LOG_SIMPLE', NET_SSH2_LOG_SIMPLE);

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/**

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* Returns the message content

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*/

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define('NET_SFTP_LOG_COMPLEX', NET_SSH2_LOG_COMPLEX);

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/**

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* Outputs the message content in real-time.

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*/

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define('NET_SFTP_LOG_REALTIME', 3);

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/**#@-*/

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/**

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* SFTP channel constant

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*

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* Net_SSH2::exec() uses 0 and Net_SSH2::read() / Net_SSH2::write() use 1.

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*

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* @see Net_SSH2::_send_channel_packet()

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* @see Net_SSH2::_get_channel_packet()

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* @access private

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*/

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define('NET_SFTP_CHANNEL', 0x100);

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/**#@+

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* @access public

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* @see Net_SFTP::put()

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*/

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/**

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* Reads data from a local file.

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*/

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define('NET_SFTP_LOCAL_FILE', 1);

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/**

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* Reads data from a string.

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*/

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// this value isn't really used anymore but i'm keeping it reserved for historical reasons

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define('NET_SFTP_STRING', 2);

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/**

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* Resumes an upload

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*/

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define('NET_SFTP_RESUME', 4);

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/**

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* Append a local file to an already existing remote file

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*/

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define('NET_SFTP_RESUME_START', 8);

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/**#@-*/

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/**

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* Pure-PHP implementations of SFTP.

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*

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* @package Net_SFTP

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* @author Jim Wigginton <terrafrost@php.net>

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* @access public

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*/

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class Net_SFTP extends Net_SSH2

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{

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/**

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* Packet Types

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*

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* @see Net_SFTP::Net_SFTP()

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* @var Array

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* @access private

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*/

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public $packet_types = array();

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/**

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* Status Codes

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*

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* @see Net_SFTP::Net_SFTP()

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* @var Array

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* @access private

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*/

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public $status_codes = array();

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/**

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* The Request ID

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*

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* The request ID exists in the off chance that a packet is sent out-of-order. Of course, this library doesn't support

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* concurrent actions, so it's somewhat academic, here.

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*

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* @var Integer

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* @see Net_SFTP::_send_sftp_packet()

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* @access private

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*/

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public $request_id = false;

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/**

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* The Packet Type

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*

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* The request ID exists in the off chance that a packet is sent out-of-order. Of course, this library doesn't support

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* concurrent actions, so it's somewhat academic, here.

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*

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* @var Integer

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* @see Net_SFTP::_get_sftp_packet()

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* @access private

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*/

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public $packet_type = -1;

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/**

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* Packet Buffer

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*

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* @var String

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* @see Net_SFTP::_get_sftp_packet()

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* @access private

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*/

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public $packet_buffer = '';

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/**

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* Extensions supported by the server

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*

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* @var Array

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* @see Net_SFTP::_initChannel()

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* @access private

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*/

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public $extensions = array();

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/**

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* Server SFTP version

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*

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* @var Integer

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* @see Net_SFTP::_initChannel()

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* @access private

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*/

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public $version;

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/**

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* Current working directory

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*

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* @var String

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* @see Net_SFTP::_realpath()

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* @see Net_SFTP::chdir()

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* @access private

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*/

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public $pwd = false;

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/**

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* Packet Type Log

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*

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* @see Net_SFTP::getLog()

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* @var Array

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* @access private

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*/

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public $packet_type_log = array();

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/**

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* Packet Log

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*

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* @see Net_SFTP::getLog()

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* @var Array

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* @access private

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*/

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public $packet_log = array();

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/**

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* Error information

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*

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* @see Net_SFTP::getSFTPErrors()

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* @see Net_SFTP::getLastSFTPError()

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* @var String

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* @access private

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*/

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public $sftp_errors = array();

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/**

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* Stat Cache

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*

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* Rather than always having to open a directory and close it immediately there after to see if a file is a directory

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* we'll cache the results.

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*

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* @see Net_SFTP::_update_stat_cache()

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* @see Net_SFTP::_remove_from_stat_cache()

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* @see Net_SFTP::_query_stat_cache()

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* @var Array

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* @access private

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*/

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public $stat_cache = array();

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/**

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* Max SFTP Packet Size

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*

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* @see Net_SFTP::Net_SFTP()

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* @see Net_SFTP::get()

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* @var Array

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* @access private

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*/

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public $max_sftp_packet;

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/**

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* Stat Cache Flag

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*

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* @see Net_SFTP::disableStatCache()

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* @see Net_SFTP::enableStatCache()

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* @var Boolean

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* @access private

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*/

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public $use_stat_cache = true;

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/**

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* Sort Options

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*

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* @see Net_SFTP::_comparator()

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* @see Net_SFTP::setListOrder()

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* @var Array

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* @access private

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*/

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public $sortOptions = array();

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/**

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* Default Constructor.

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*

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* Connects to an SFTP server

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*

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* @param String $host

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* @param optional Integer $port

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* @param optional Integer $timeout

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*

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* @return Net_SFTP

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* @access public

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*/

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public function __construct($host, $port = 22, $timeout = 10)

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{

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parent::__construct($host, $port, $timeout);

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$this->max_sftp_packet = 1 << 15;

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$this->packet_types = array(

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1 => 'NET_SFTP_INIT',

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2 => 'NET_SFTP_VERSION',

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/* the format of SSH_FXP_OPEN changed between SFTPv4 and SFTPv5+:

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SFTPv5+: http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.1.1

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pre-SFTPv5 : http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-6.3 */

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3 => 'NET_SFTP_OPEN',

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4 => 'NET_SFTP_CLOSE',

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5 => 'NET_SFTP_READ',

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6 => 'NET_SFTP_WRITE',

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7 => 'NET_SFTP_LSTAT',

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9 => 'NET_SFTP_SETSTAT',

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11 => 'NET_SFTP_OPENDIR',

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12 => 'NET_SFTP_READDIR',

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13 => 'NET_SFTP_REMOVE',

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14 => 'NET_SFTP_MKDIR',

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15 => 'NET_SFTP_RMDIR',

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16 => 'NET_SFTP_REALPATH',

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17 => 'NET_SFTP_STAT',

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/* the format of SSH_FXP_RENAME changed between SFTPv4 and SFTPv5+:

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SFTPv5+: http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.3

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pre-SFTPv5 : http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-6.5 */

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18 => 'NET_SFTP_RENAME',

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19 => 'NET_SFTP_READLINK',

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20 => 'NET_SFTP_SYMLINK',

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101 => 'NET_SFTP_STATUS',

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102 => 'NET_SFTP_HANDLE',

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/* the format of SSH_FXP_NAME changed between SFTPv3 and SFTPv4+:

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SFTPv4+: http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-9.4

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pre-SFTPv4 : http://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-7 */

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103 => 'NET_SFTP_DATA',

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104 => 'NET_SFTP_NAME',

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105 => 'NET_SFTP_ATTRS',

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200 => 'NET_SFTP_EXTENDED',

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);

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$this->status_codes = array(

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0 => 'NET_SFTP_STATUS_OK',

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1 => 'NET_SFTP_STATUS_EOF',

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2 => 'NET_SFTP_STATUS_NO_SUCH_FILE',

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3 => 'NET_SFTP_STATUS_PERMISSION_DENIED',

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4 => 'NET_SFTP_STATUS_FAILURE',

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5 => 'NET_SFTP_STATUS_BAD_MESSAGE',

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6 => 'NET_SFTP_STATUS_NO_CONNECTION',

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7 => 'NET_SFTP_STATUS_CONNECTION_LOST',

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8 => 'NET_SFTP_STATUS_OP_UNSUPPORTED',

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9 => 'NET_SFTP_STATUS_INVALID_HANDLE',

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10 => 'NET_SFTP_STATUS_NO_SUCH_PATH',

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11 => 'NET_SFTP_STATUS_FILE_ALREADY_EXISTS',

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12 => 'NET_SFTP_STATUS_WRITE_PROTECT',

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13 => 'NET_SFTP_STATUS_NO_MEDIA',

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14 => 'NET_SFTP_STATUS_NO_SPACE_ON_FILESYSTEM',

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15 => 'NET_SFTP_STATUS_QUOTA_EXCEEDED',

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16 => 'NET_SFTP_STATUS_UNKNOWN_PRINCIPAL',

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17 => 'NET_SFTP_STATUS_LOCK_CONFLICT',

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18 => 'NET_SFTP_STATUS_DIR_NOT_EMPTY',

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19 => 'NET_SFTP_STATUS_NOT_A_DIRECTORY',

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20 => 'NET_SFTP_STATUS_INVALID_FILENAME',

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21 => 'NET_SFTP_STATUS_LINK_LOOP',

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22 => 'NET_SFTP_STATUS_CANNOT_DELETE',

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23 => 'NET_SFTP_STATUS_INVALID_PARAMETER',

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24 => 'NET_SFTP_STATUS_FILE_IS_A_DIRECTORY',

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25 => 'NET_SFTP_STATUS_BYTE_RANGE_LOCK_CONFLICT',

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26 => 'NET_SFTP_STATUS_BYTE_RANGE_LOCK_REFUSED',

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27 => 'NET_SFTP_STATUS_DELETE_PENDING',

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28 => 'NET_SFTP_STATUS_FILE_CORRUPT',

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29 => 'NET_SFTP_STATUS_OWNER_INVALID',

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30 => 'NET_SFTP_STATUS_GROUP_INVALID',

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31 => 'NET_SFTP_STATUS_NO_MATCHING_BYTE_RANGE_LOCK',

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);

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// http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-7.1

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// the order, in this case, matters quite a lot - see Net_SFTP::_parseAttributes() to understand why

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$this->attributes = array(

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0x00000001 => 'NET_SFTP_ATTR_SIZE',

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0x00000002 => 'NET_SFTP_ATTR_UIDGID', // defined in SFTPv3, removed in SFTPv4+

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0x00000004 => 'NET_SFTP_ATTR_PERMISSIONS',

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0x00000008 => 'NET_SFTP_ATTR_ACCESSTIME',

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// 0x80000000 will yield a floating point on 32-bit systems and converting floating points to integers

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// yields inconsistent behavior depending on how php is compiled. so we left shift -1 (which, in

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// two's compliment, consists of all 1 bits) by 31. on 64-bit systems this'll yield 0xFFFFFFFF80000000.

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// that's not a problem, however, and 'anded' and a 32-bit number, as all the leading 1 bits are ignored.

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-1 << 31 => 'NET_SFTP_ATTR_EXTENDED',

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);

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// http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-6.3

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// the flag definitions change somewhat in SFTPv5+. if SFTPv5+ support is added to this library, maybe name

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// the array for that $this->open5_flags and similarily alter the constant names.

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$this->open_flags = array(

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0x00000001 => 'NET_SFTP_OPEN_READ',

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0x00000002 => 'NET_SFTP_OPEN_WRITE',

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0x00000004 => 'NET_SFTP_OPEN_APPEND',

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0x00000008 => 'NET_SFTP_OPEN_CREATE',

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0x00000010 => 'NET_SFTP_OPEN_TRUNCATE',

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0x00000020 => 'NET_SFTP_OPEN_EXCL',

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);

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// http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-5.2

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// see Net_SFTP::_parseLongname() for an explanation

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$this->file_types = array(

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1 => 'NET_SFTP_TYPE_REGULAR',

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2 => 'NET_SFTP_TYPE_DIRECTORY',

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3 => 'NET_SFTP_TYPE_SYMLINK',

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4 => 'NET_SFTP_TYPE_SPECIAL',

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5 => 'NET_SFTP_TYPE_UNKNOWN',

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// the followin types were first defined for use in SFTPv5+

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// http://tools.ietf.org/html/draft-ietf-secsh-filexfer-05#section-5.2

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6 => 'NET_SFTP_TYPE_SOCKET',

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7 => 'NET_SFTP_TYPE_CHAR_DEVICE',

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8 => 'NET_SFTP_TYPE_BLOCK_DEVICE',

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9 => 'NET_SFTP_TYPE_FIFO',

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);

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$this->_define_array(

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$this->packet_types,

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$this->status_codes,

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$this->attributes,

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$this->open_flags,

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$this->file_types

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);

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[409] Fix | Delete

if (!defined('NET_SFTP_QUEUE_SIZE')) {

[410] Fix | Delete

define('NET_SFTP_QUEUE_SIZE', 50);

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}

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}

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[414] Fix | Delete

/**

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* Login

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*

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* @param String $username

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* @param optional String $password

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*

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* @return Boolean

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* @access public

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*/

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public function login($username)

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{

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$args = func_get_args();

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if (!call_user_func_array(array(&$this, '_login'), $args)) {

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return false;

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}

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$this->window_size_server_to_client[NET_SFTP_CHANNEL] = $this->window_size;

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$packet = pack('CNa*N3',

[433] Fix | Delete

NET_SSH2_MSG_CHANNEL_OPEN, strlen('session'), 'session', NET_SFTP_CHANNEL, $this->window_size, 0x4000);

[434] Fix | Delete

[435] Fix | Delete

if (!$this->_send_binary_packet($packet)) {

[436] Fix | Delete

return false;

[437] Fix | Delete

}

[438] Fix | Delete

[439] Fix | Delete

$this->channel_status[NET_SFTP_CHANNEL] = NET_SSH2_MSG_CHANNEL_OPEN;

[440] Fix | Delete

[441] Fix | Delete

$response = $this->_get_channel_packet(NET_SFTP_CHANNEL);

[442] Fix | Delete

if ($response === false) {

[443] Fix | Delete

return false;

[444] Fix | Delete

}

[445] Fix | Delete

[446] Fix | Delete

$packet = pack('CNNa*CNa*',

[447] Fix | Delete

NET_SSH2_MSG_CHANNEL_REQUEST, $this->server_channels[NET_SFTP_CHANNEL], strlen('subsystem'), 'subsystem', 1, strlen('sftp'), 'sftp');

[448] Fix | Delete

if (!$this->_send_binary_packet($packet)) {

[449] Fix | Delete

return false;

[450] Fix | Delete

}

[451] Fix | Delete

[452] Fix | Delete

$this->channel_status[NET_SFTP_CHANNEL] = NET_SSH2_MSG_CHANNEL_REQUEST;

[453] Fix | Delete

[454] Fix | Delete

$response = $this->_get_channel_packet(NET_SFTP_CHANNEL);

[455] Fix | Delete

if ($response === false) {

[456] Fix | Delete

// from PuTTY's psftp.exe

[457] Fix | Delete

$command = "test -x /usr/lib/sftp-server && exec /usr/lib/sftp-server\n".

[458] Fix | Delete

"test -x /usr/local/lib/sftp-server && exec /usr/local/lib/sftp-server\n".

[459] Fix | Delete

"exec sftp-server";

[460] Fix | Delete

// we don't do $this->exec($command, false) because exec() operates on a different channel and plus the SSH_MSG_CHANNEL_OPEN that exec() does

[461] Fix | Delete

// is redundant

[462] Fix | Delete

$packet = pack('CNNa*CNa*',

[463] Fix | Delete

NET_SSH2_MSG_CHANNEL_REQUEST, $this->server_channels[NET_SFTP_CHANNEL], strlen('exec'), 'exec', 1, strlen($command), $command);

[464] Fix | Delete

if (!$this->_send_binary_packet($packet)) {

[465] Fix | Delete

return false;

[466] Fix | Delete

}

[467] Fix | Delete

[468] Fix | Delete

$this->channel_status[NET_SFTP_CHANNEL] = NET_SSH2_MSG_CHANNEL_REQUEST;

[469] Fix | Delete

[470] Fix | Delete

$response = $this->_get_channel_packet(NET_SFTP_CHANNEL);

[471] Fix | Delete

if ($response === false) {

[472] Fix | Delete

return false;

[473] Fix | Delete

}

[474] Fix | Delete

}

[475] Fix | Delete

[476] Fix | Delete

$this->channel_status[NET_SFTP_CHANNEL] = NET_SSH2_MSG_CHANNEL_DATA;

[477] Fix | Delete

[478] Fix | Delete

if (!$this->_send_sftp_packet(NET_SFTP_INIT, "\0\0\0\3")) {

[479] Fix | Delete

return false;

[480] Fix | Delete

}

[481] Fix | Delete

[482] Fix | Delete

$response = $this->_get_sftp_packet();

[483] Fix | Delete

if ($this->packet_type != NET_SFTP_VERSION) {

[484] Fix | Delete

user_error('Expected SSH_FXP_VERSION');

[485] Fix | Delete

[486] Fix | Delete

return false;

[487] Fix | Delete

}

[488] Fix | Delete

[489] Fix | Delete

extract(unpack('Nversion', $this->_string_shift($response, 4)));

[490] Fix | Delete

$this->version = $version;

[491] Fix | Delete

while (!empty($response)) {

[492] Fix | Delete

extract(unpack('Nlength', $this->_string_shift($response, 4)));

[493] Fix | Delete

$key = $this->_string_shift($response, $length);

[494] Fix | Delete

extract(unpack('Nlength', $this->_string_shift($response, 4)));

[495] Fix | Delete

$value = $this->_string_shift($response, $length);

[496] Fix | Delete

$this->extensions[$key] = $value;

[497] Fix | Delete

}

[498] Fix | Delete

[499] Fix | Delete