<?php
/**
* WordPress Filesystem Class for implementing SSH2
*
* To use this class you must follow these steps for PHP 5.2.6+
*
* @contrib http://kevin.vanzonneveld.net/techblog/article/make_ssh_connections_with_php/ - Installation Notes
*
* Complie libssh2 (Note: Only 0.14 is officaly working with PHP 5.2.6+ right now, But many users have found the latest versions work)
*
* cd /usr/src
* wget http://surfnet.dl.sourceforge.net/sourceforge/libssh2/libssh2-0.14.tar.gz
* tar -zxvf libssh2-0.14.tar.gz
* cd libssh2-0.14/
* ./configure
* make all install
*
* Note: Do not leave the directory yet!
*
* Enter: pecl install -f ssh2
*
* Copy the ssh.so file it creates to your PHP Module Directory.
* Open up your PHP.INI file and look for where extensions are placed.
* Add in your PHP.ini file: extension=ssh2.so
*
* Restart Apache!
* Check phpinfo() streams to confirm that: ssh2.shell, ssh2.exec, ssh2.tunnel, ssh2.scp, ssh2.sftp exist.
*
* Note: as of WordPress 2.8, This utilises the PHP5+ function 'stream_get_contents'
*
* @since 2.7.0
*
* @package WordPress
* @subpackage Filesystem
*/
class WP_Filesystem_SSH2 extends WP_Filesystem_Base {
/**
* @access public
*/
public $link = false;
/**
* @access public
* @var resource
*/
public $sftp_link;
public $keys = false;
/**
* @access public
*
* @param array $opt
*/
public function __construct( $opt = '' ) {
$this->method = 'ssh2';
$this->errors = new WP_Error();
//Check if possible to use ssh2 functions.
if ( ! extension_loaded('ssh2') ) {
$this->errors->add('no_ssh2_ext', __('The ssh2 PHP extension is not available'));
return;
}
if ( !function_exists('stream_get_contents') ) {
$this->errors->add(
'ssh2_php_requirement',
sprintf(
/* translators: %s: stream_get_contents() */
__( 'The ssh2 PHP extension is available, however, we require the PHP5 function %s' ),
'<code>stream_get_contents()</code>'
)
);
return;
}
// Set defaults:
if ( empty($opt['port']) )
$this->options['port'] = 22;
else
$this->options['port'] = $opt['port'];
if ( empty($opt['hostname']) )
$this->errors->add('empty_hostname', __('SSH2 hostname is required'));
else
$this->options['hostname'] = $opt['hostname'];
// Check if the options provided are OK.
if ( !empty ($opt['public_key']) && !empty ($opt['private_key']) ) {
$this->options['public_key'] = $opt['public_key'];
$this->options['private_key'] = $opt['private_key'];
$this->options['hostkey'] = array('hostkey' => 'ssh-rsa');
$this->keys = true;
} elseif ( empty ($opt['username']) ) {
$this->errors->add('empty_username', __('SSH2 username is required'));
}
if ( !empty($opt['username']) )
$this->options['username'] = $opt['username'];
if ( empty ($opt['password']) ) {
// Password can be blank if we are using keys.
if ( !$this->keys )
$this->errors->add('empty_password', __('SSH2 password is required'));
} else {
$this->options['password'] = $opt['password'];
}
}
/**
* @access public
*
* @return bool
*/
public function connect() {
if ( ! $this->keys ) {
$this->link = @ssh2_connect($this->options['hostname'], $this->options['port']);
} else {
$this->link = @ssh2_connect($this->options['hostname'], $this->options['port'], $this->options['hostkey']);
}
if ( ! $this->link ) {
$this->errors->add( 'connect',
/* translators: %s: hostname:port */
sprintf( __( 'Failed to connect to SSH2 Server %s' ),
$this->options['hostname'] . ':' . $this->options['port']
)
);
return false;
}
if ( !$this->keys ) {
if ( ! @ssh2_auth_password($this->link, $this->options['username'], $this->options['password']) ) {
$this->errors->add( 'auth',
/* translators: %s: username */
sprintf( __( 'Username/Password incorrect for %s' ),
$this->options['username']
)
);
return false;
}
} else {
if ( ! @ssh2_auth_pubkey_file($this->link, $this->options['username'], $this->options['public_key'], $this->options['private_key'], $this->options['password'] ) ) {
$this->errors->add( 'auth',
/* translators: %s: username */
sprintf( __( 'Public and Private keys incorrect for %s' ),
$this->options['username']
)
);
return false;
}
}
$this->sftp_link = ssh2_sftp( $this->link );
if ( ! $this->sftp_link ) {
$this->errors->add( 'connect',
/* translators: %s: hostname:port */
sprintf( __( 'Failed to initialize a SFTP subsystem session with the SSH2 Server %s' ),
$this->options['hostname'] . ':' . $this->options['port']
)
);
return false;
}
return true;
}
/**
* Gets the ssh2.sftp PHP stream wrapper path to open for the given file.
*
* This method also works around a PHP bug where the root directory (/) cannot
* be opened by PHP functions, causing a false failure. In order to work around
* this, the path is converted to /./ which is semantically the same as /
* See https://bugs.php.net/bug.php?id=64169 for more details.
*
* @access public
*
* @since 4.4.0
*
* @param string $path The File/Directory path on the remote server to return
* @return string The ssh2.sftp:// wrapped path to use.
*/
public function sftp_path( $path ) {
if ( '/' === $path ) {
$path = '/./';
}
return 'ssh2.sftp://' . $this->sftp_link . '/' . ltrim( $path, '/' );
}
/**
* @access public
*
* @param string $command
* @param bool $returnbool
* @return bool|string True on success, false on failure. String if the command was executed, `$returnbool`
* is false (default), and data from the resulting stream was retrieved.
*/
public function run_command( $command, $returnbool = false ) {
if ( ! $this->link )
return false;
if ( ! ($stream = ssh2_exec($this->link, $command)) ) {
$this->errors->add( 'command',
/* translators: %s: command */
sprintf( __( 'Unable to perform command: %s'),
$command
)
);
} else {
stream_set_blocking( $stream, true );
stream_set_timeout( $stream, FS_TIMEOUT );
$data = stream_get_contents( $stream );
fclose( $stream );
if ( $returnbool )
return ( $data === false ) ? false : '' != trim($data);
else
return $data;
}
return false;
}
/**
* @access public
*
* @param string $file
* @return string|false
*/
public function get_contents( $file ) {
return file_get_contents( $this->sftp_path( $file ) );
}
/**
* @access public
*
* @param string $file
* @return array
*/
public function get_contents_array($file) {
return file( $this->sftp_path( $file ) );
}
/**
* @access public
*
* @param string $file
* @param string $contents
* @param bool|int $mode
* @return bool
*/
public function put_contents($file, $contents, $mode = false ) {
$ret = file_put_contents( $this->sftp_path( $file ), $contents );
if ( $ret !== strlen( $contents ) )
return false;
$this->chmod($file, $mode);
return true;
}
/**
* @access public
*
* @return bool
*/
public function cwd() {
$cwd = ssh2_sftp_realpath( $this->sftp_link, '.' );
if ( $cwd ) {
$cwd = trailingslashit( trim( $cwd ) );
}
return $cwd;
}
/**
* @access public
*
* @param string $dir
* @return bool|string
*/
public function chdir($dir) {
return $this->run_command('cd ' . $dir, true);
}
/**
* @access public
*
* @param string $file
* @param string $group
* @param bool $recursive
*
* @return bool
*/
public function chgrp($file, $group, $recursive = false ) {
if ( ! $this->exists($file) )
return false;
if ( ! $recursive || ! $this->is_dir($file) )
return $this->run_command(sprintf('chgrp %s %s', escapeshellarg($group), escapeshellarg($file)), true);
return $this->run_command(sprintf('chgrp -R %s %s', escapeshellarg($group), escapeshellarg($file)), true);
}
/**
* @access public
*
* @param string $file
* @param int $mode
* @param bool $recursive
* @return bool|string
*/
public function chmod($file, $mode = false, $recursive = false) {
if ( ! $this->exists($file) )
return false;
if ( ! $mode ) {
if ( $this->is_file($file) )
$mode = FS_CHMOD_FILE;
elseif ( $this->is_dir($file) )
$mode = FS_CHMOD_DIR;
else
return false;
}
if ( ! $recursive || ! $this->is_dir($file) )
return $this->run_command(sprintf('chmod %o %s', $mode, escapeshellarg($file)), true);
return $this->run_command(sprintf('chmod -R %o %s', $mode, escapeshellarg($file)), true);
}
/**
* Change the ownership of a file / folder.
*
* @access public
*
* @param string $file Path to the file.
* @param string|int $owner A user name or number.
* @param bool $recursive Optional. If set True changes file owner recursivly. Default False.
* @return bool True on success or false on failure.
*/
public function chown( $file, $owner, $recursive = false ) {
if ( ! $this->exists($file) )
return false;
if ( ! $recursive || ! $this->is_dir($file) )
return $this->run_command(sprintf('chown %s %s', escapeshellarg($owner), escapeshellarg($file)), true);
return $this->run_command(sprintf('chown -R %s %s', escapeshellarg($owner), escapeshellarg($file)), true);
}
/**
* @access public
*
* @param string $file
* @return string|false
*/
public function owner($file) {
$owneruid = @fileowner( $this->sftp_path( $file ) );
if ( ! $owneruid )
return false;
if ( ! function_exists('posix_getpwuid') )
return $owneruid;
$ownerarray = posix_getpwuid($owneruid);
return $ownerarray['name'];
}
/**
* @access public
*
* @param string $file
* @return string
*/
public function getchmod($file) {
return substr( decoct( @fileperms( $this->sftp_path( $file ) ) ), -3 );
}
/**
* @access public
*
* @param string $file
* @return string|false
*/
public function group($file) {
$gid = @filegroup( $this->sftp_path( $file ) );
if ( ! $gid )
return false;
if ( ! function_exists('posix_getgrgid') )
return $gid;
$grouparray = posix_getgrgid($gid);
return $grouparray['name'];
}
/**
* @access public
*
* @param string $source
* @param string $destination
* @param bool $overwrite
* @param int|bool $mode
* @return bool
*/
public function copy($source, $destination, $overwrite = false, $mode = false) {
if ( ! $overwrite && $this->exists($destination) )
return false;
$content = $this->get_contents($source);
if ( false === $content)
return false;
return $this->put_contents($destination, $content, $mode);
}
/**
* @access public
*
* @param string $source
* @param string $destination
* @param bool $overwrite
* @return bool
*/
public function move($source, $destination, $overwrite = false) {
return @ssh2_sftp_rename( $this->sftp_link, $source, $destination );
}
/**
* @access public
*
* @param string $file
* @param bool $recursive
* @param string|bool $type
* @return bool
*/
public function delete($file, $recursive = false, $type = false) {
if ( 'f' == $type || $this->is_file($file) )
return ssh2_sftp_unlink($this->sftp_link, $file);
if ( ! $recursive )
return ssh2_sftp_rmdir($this->sftp_link, $file);
$filelist = $this->dirlist($file);
if ( is_array($filelist) ) {
foreach ( $filelist as $filename => $fileinfo) {
$this->delete($file . '/' . $filename, $recursive, $fileinfo['type']);
}
}
return ssh2_sftp_rmdir($this->sftp_link, $file);
}
/**
* @access public
*
* @param string $file
* @return bool
*/
public function exists($file) {
return file_exists( $this->sftp_path( $file ) );
}
/**
* @access public
*
* @param string $file
* @return bool
*/
public function is_file($file) {
return is_file( $this->sftp_path( $file ) );
}
/**
* @access public
*
* @param string $path
* @return bool
*/
public function is_dir($path) {
return is_dir( $this->sftp_path( $path ) );
}
/**
* @access public
*
* @param string $file
* @return bool
*/
public function is_readable($file) {
return is_readable( $this->sftp_path( $file ) );
}
/**
* @access public
*
* @param string $file
* @return bool
*/
public function is_writable($file) {
// PHP will base it's writable checks on system_user === file_owner, not ssh_user === file_owner
return true;
}
/**
* @access public
*
* @param string $file
* @return int
*/
public function atime($file) {
return fileatime( $this->sftp_path( $file ) );
}
/**
* @access public
*
* @param string $file
* @return int
*/
public function mtime($file) {
return filemtime( $this->sftp_path( $file ) );
}
/**
* @access public
*
* @param string $file
* @return int
*/
public function size($file) {
return filesize( $this->sftp_path( $file ) );
}
/**
* @access public
*
* @param string $file
* @param int $time
* @param int $atime
*/
public function touch($file, $time = 0, $atime = 0) {
//Not implemented.
}
/**
* @access public
*
* @param string $path
* @param mixed $chmod
* @param mixed $chown
* @param mixed $chgrp
* @return bool
*/
public function mkdir($path, $chmod = false, $chown = false, $chgrp = false) {
$path = untrailingslashit($path);
if ( empty($path) )
return false;
if ( ! $chmod )
$chmod = FS_CHMOD_DIR;
if ( ! ssh2_sftp_mkdir($this->sftp_link, $path, $chmod, true) )
return false;
if ( $chown )
$this->chown($path, $chown);
if ( $chgrp )
$this->chgrp($path, $chgrp);
return true;
}
/**
* @access public
*
* @param string $path
* @param bool $recursive
* @return bool
*/
public function rmdir($path, $recursive = false) {
return $this->delete($path, $recursive);
}
/**
* @access public
*
* @param string $path
* @param bool $include_hidden
* @param bool $recursive
* @return bool|array
*/
public function dirlist($path, $include_hidden = true, $recursive = false) {
if ( $this->is_file($path) ) {
$limit_file = basename($path);
$path = dirname($path);
} else {
$limit_file = false;
}
if ( ! $this->is_dir($path) )
return false;
$ret = array();
$dir = @dir( $this->sftp_path( $path ) );
if ( ! $dir )
return false;
while (false !== ($entry = $dir->read()) ) {
$struc = array();
$struc['name'] = $entry;
if ( '.' == $struc['name'] || '..' == $struc['name'] )
continue; //Do not care about these folders.
if ( ! $include_hidden && '.' == $struc['name'][0] )
continue;
if ( $limit_file && $struc['name'] != $limit_file )
continue;
$struc['perms'] = $this->gethchmod($path.'/'.$entry);
$struc['permsn'] = $this->getnumchmodfromh($struc['perms']);
$struc['number'] = false;
$struc['owner'] = $this->owner($path.'/'.$entry);
$struc['group'] = $this->group($path.'/'.$entry);
$struc['size'] = $this->size($path.'/'.$entry);
$struc['lastmodunix']= $this->mtime($path.'/'.$entry);
$struc['lastmod'] = date('M j',$struc['lastmodunix']);
$struc['time'] = date('h:i:s',$struc['lastmodunix']);
$struc['type'] = $this->is_dir($path.'/'.$entry) ? 'd' : 'f';
if ( 'd' == $struc['type'] ) {
if ( $recursive )
$struc['files'] = $this->dirlist($path . '/' . $struc['name'], $include_hidden, $recursive);
else
$struc['files'] = array();
}
$ret[ $struc['name'] ] = $struc;
}
$dir->close();
unset($dir);
return $ret;
}
}