309 lines
7 KiB
PHP
309 lines
7 KiB
PHP
<?php
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/**
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* Copyright (c) 2012 Henrik Kjölhede <hkjolhede@gmail.com>
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* This file is licensed under the Affero General Public License version 3 or
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* later.
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* See the COPYING-README file.
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*/
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namespace OC\Files\Storage;
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/**
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* Uses phpseclib's Net_SFTP class and the Net_SFTP_Stream stream wrapper to
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* provide access to SFTP servers.
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*/
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class SFTP extends \OC\Files\Storage\Common {
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private $host;
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private $user;
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private $password;
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private $root;
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/**
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* @var \Net_SFTP
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*/
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private $client;
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private static $tempFiles = array();
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public function __construct($params) {
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// The sftp:// scheme has to be manually registered via inclusion of
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// the 'Net/SFTP/Stream.php' file which registers the Net_SFTP_Stream
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// stream wrapper as a side effect.
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// A slightly better way to register the stream wrapper is available
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// since phpseclib 0.3.7 in the form of a static call to
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// Net_SFTP_Stream::register() which will trigger autoloading if
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// necessary.
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// TODO: Call Net_SFTP_Stream::register() instead when phpseclib is
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// updated to 0.3.7 or higher.
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require_once 'Net/SFTP/Stream.php';
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$this->host = $params['host'];
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$proto = strpos($this->host, '://');
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if ($proto != false) {
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$this->host = substr($this->host, $proto+3);
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}
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$this->user = $params['user'];
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$this->password = $params['password'];
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$this->root
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= isset($params['root']) ? $this->cleanPath($params['root']) : '/';
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if ($this->root[0] != '/') {
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$this->root = '/' . $this->root;
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}
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if (substr($this->root, -1, 1) != '/') {
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$this->root .= '/';
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}
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$hostKeys = $this->readHostKeys();
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$this->client = new \Net_SFTP($this->host);
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// The SSH Host Key MUST be verified before login().
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$currentHostKey = $this->client->getServerPublicHostKey();
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if (array_key_exists($this->host, $hostKeys)) {
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if ($hostKeys[$this->host] != $currentHostKey) {
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throw new \Exception('Host public key does not match known key');
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}
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} else {
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$hostKeys[$this->host] = $currentHostKey;
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$this->writeHostKeys($hostKeys);
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}
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if (!$this->client->login($this->user, $this->password)) {
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throw new \Exception('Login failed');
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}
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}
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public function test() {
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if (
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!isset($this->host)
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|| !isset($this->user)
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|| !isset($this->password)
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) {
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return false;
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}
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return $this->client->nlist() !== false;
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}
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public function getId(){
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return 'sftp::' . $this->user . '@' . $this->host . '/' . $this->root;
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}
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/**
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* @param string $path
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*/
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private function absPath($path) {
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return $this->root . $this->cleanPath($path);
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}
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private function hostKeysPath() {
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try {
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$storage_view = \OCP\Files::getStorage('files_external');
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if ($storage_view) {
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return \OCP\Config::getSystemValue('datadirectory') .
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$storage_view->getAbsolutePath('') .
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'ssh_hostKeys';
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}
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} catch (\Exception $e) {
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}
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return false;
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}
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private function writeHostKeys($keys) {
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try {
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$keyPath = $this->hostKeysPath();
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if ($keyPath && file_exists($keyPath)) {
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$fp = fopen($keyPath, 'w');
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foreach ($keys as $host => $key) {
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fwrite($fp, $host . '::' . $key . "\n");
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}
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fclose($fp);
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return true;
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}
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} catch (\Exception $e) {
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}
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return false;
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}
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private function readHostKeys() {
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try {
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$keyPath = $this->hostKeysPath();
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if (file_exists($keyPath)) {
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$hosts = array();
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$keys = array();
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$lines = file($keyPath, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
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if ($lines) {
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foreach ($lines as $line) {
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$hostKeyArray = explode("::", $line, 2);
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if (count($hostKeyArray) == 2) {
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$hosts[] = $hostKeyArray[0];
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$keys[] = $hostKeyArray[1];
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}
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}
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return array_combine($hosts, $keys);
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}
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}
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} catch (\Exception $e) {
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}
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return array();
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}
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public function mkdir($path) {
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try {
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return $this->client->mkdir($this->absPath($path));
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} catch (\Exception $e) {
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return false;
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}
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}
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public function rmdir($path) {
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try {
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return $this->client->delete($this->absPath($path), true);
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} catch (\Exception $e) {
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return false;
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}
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}
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public function opendir($path) {
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try {
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$list = $this->client->nlist($this->absPath($path));
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if ($list === false) {
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return false;
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}
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$id = md5('sftp:' . $path);
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$dirStream = array();
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foreach($list as $file) {
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if ($file != '.' && $file != '..') {
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$dirStream[] = $file;
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}
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}
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\OC\Files\Stream\Dir::register($id, $dirStream);
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return opendir('fakedir://' . $id);
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} catch(\Exception $e) {
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return false;
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}
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}
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public function filetype($path) {
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try {
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$stat = $this->client->stat($this->absPath($path));
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if ($stat['type'] == NET_SFTP_TYPE_REGULAR) {
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return 'file';
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}
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if ($stat['type'] == NET_SFTP_TYPE_DIRECTORY) {
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return 'dir';
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}
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} catch (\Exeption $e) {
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}
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return false;
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}
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public function file_exists($path) {
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try {
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return $this->client->stat($this->absPath($path)) !== false;
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} catch (\Exception $e) {
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return false;
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}
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}
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public function unlink($path) {
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try {
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return $this->client->delete($this->absPath($path), true);
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} catch (\Exception $e) {
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return false;
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}
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}
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public function fopen($path, $mode) {
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try {
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$absPath = $this->absPath($path);
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switch($mode) {
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case 'r':
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case 'rb':
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if ( !$this->file_exists($path)) {
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return false;
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}
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case 'w':
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case 'wb':
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case 'a':
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case 'ab':
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case 'r+':
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case 'w+':
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case 'wb+':
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case 'a+':
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case 'x':
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case 'x+':
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case 'c':
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case 'c+':
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$context = stream_context_create(array('sftp' => array('session' => $this->client)));
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return fopen($this->constructUrl($path), $mode, false, $context);
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}
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} catch (\Exception $e) {
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}
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return false;
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}
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public function touch($path, $mtime=null) {
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try {
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if (!is_null($mtime)) {
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return false;
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}
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if (!$this->file_exists($path)) {
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$this->client->put($this->absPath($path), '');
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} else {
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return false;
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}
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} catch (\Exception $e) {
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return false;
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}
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return true;
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}
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public function getFile($path, $target) {
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$this->client->get($path, $target);
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}
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public function uploadFile($path, $target) {
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$this->client->put($target, $path, NET_SFTP_LOCAL_FILE);
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}
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public function rename($source, $target) {
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try {
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if (!$this->is_dir($target) && $this->file_exists($target)) {
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$this->unlink($target);
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}
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return $this->client->rename(
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$this->absPath($source),
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$this->absPath($target)
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);
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} catch (\Exception $e) {
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return false;
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}
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}
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public function stat($path) {
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try {
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$stat = $this->client->stat($this->absPath($path));
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$mtime = $stat ? $stat['mtime'] : -1;
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$size = $stat ? $stat['size'] : 0;
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return array('mtime' => $mtime, 'size' => $size, 'ctime' => -1);
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} catch (\Exception $e) {
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return false;
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}
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}
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/**
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* @param string $path
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*/
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public function constructUrl($path) {
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// Do not pass the password here. We want to use the Net_SFTP object
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// supplied via stream context or fail. We only supply username and
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// hostname because this might show up in logs (they are not used).
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$url = 'sftp://'.$this->user.'@'.$this->host.$this->root.$path;
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return $url;
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}
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}
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