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<?php
/**
* WordPress Filesystem Class for implementing SSH2
*
* To use this class you must follow these steps for PHP 5.2.6+
*
* {@link http://kevin.vanzonneveld.net/techblog/article/make_ssh_connections_with_php/ - Installation Notes}
*
* Compile libssh2 (Note: Only 0.14 is officially working with PHP 5.2.6+ right now, But many users have found the latest versions work)
*
* cd /usr/src
* wget https://www.libssh2.org/download/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 utilizes the PHP5+ function `stream_get_contents()`.
*
* @since 2.7.0
*
* @package WordPress
* @subpackage Filesystem
*/
class WP_Filesystem_SSH2 extends WP_Filesystem_Base {
/**
* @since 2.7.0
* @var resource
*/
public $link = false;
/**
* @since 2.7.0
* @var resource
*/
public $sftp_link;
/**
* @since 2.7.0
* @var bool
*/
public $keys = false;
/**
* Constructor.
*
* @since 2.7.0
*
* @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;
}
// 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,ssh-ed25519' );
$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'] = null;
}
} else {
$this->options['password'] = $opt['password'];
}
}
/**
* Connects filesystem.
*
* @since 2.7.0
*
* @return bool True on success, false on failure.
*/
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',
sprintf(
/* translators: %s: hostname:port */
__( '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',
sprintf(
/* translators: %s: Username. */
__( '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',
sprintf(
/* translators: %s: Username. */
__( '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',
sprintf(
/* translators: %s: hostname:port */
__( '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.
*
* @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, '/' );
}
/**
* @since 2.7.0
*
* @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;
}
$stream = ssh2_exec( $this->link, $command );
if ( ! $stream ) {
$this->errors->add(
'command',
sprintf(
/* translators: %s: Command. */
__( '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 ( false === $data ) ? false : '' !== trim( $data );
} else {
return $data;
}
}
return false;
}
/**
* Reads entire file into a string.
*
* @since 2.7.0
*
* @param string $file Name of the file to read.
* @return string|false Read data on success, false if no temporary file could be opened,
* or if the file couldn't be retrieved.
*/
public function get_contents( $file ) {
return file_get_contents( $this->sftp_path( $file ) );
}
/**
* Reads entire file into an array.
*
* @since 2.7.0
*
* @param string $file Path to the file.
* @return array|false File contents in an array on success, false on failure.
*/
public function get_contents_array( $file ) {
return file( $this->sftp_path( $file ) );
}
/**
* Writes a string to a file.
*
* @since 2.7.0
*
* @param string $file Remote path to the file where to write the data.
* @param string $contents The data to write.
* @param int|false $mode Optional. The file permissions as octal number, usually 0644.
* Default false.
* @return bool True on success, false on failure.
*/
public function put_contents( $file, $contents, $mode = false ) {
$ret = file_put_contents( $this->sftp_path( $file ), $contents );
if ( strlen( $contents ) !== $ret ) {
return false;
}
$this->chmod( $file, $mode );
return true;
}
/**
* Gets the current working directory.
*
* @since 2.7.0
*
* @return string|false The current working directory on success, false on failure.
*/
public function cwd() {
$cwd = ssh2_sftp_realpath( $this->sftp_link, '.' );
if ( $cwd ) {
$cwd = trailingslashit( trim( $cwd ) );
}
return $cwd;
}
/**
* Changes current directory.
*
* @since 2.7.0
*
* @param string $dir The new current directory.
* @return bool True on success, false on failure.
*/
public function chdir( $dir ) {
return $this->run_command( 'cd ' . $dir, true );
}
/**
* Changes the file group.
*
* @since 2.7.0
*
* @param string $file Path to the file.
* @param string|int $group A group name or number.
* @param bool $recursive Optional. If set to true, changes file group recursively.
* Default false.
* @return bool True on success, false on failure.
*/
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 );
}
/**
* Changes filesystem permissions.
*
* @since 2.7.0
*
* @param string $file Path to the file.
* @param int|false $mode Optional. The permissions as octal number, usually 0644 for files,
* 0755 for directories. Default false.
* @param bool $recursive Optional. If set to true, changes file permissions recursively.
* Default false.
* @return bool True on success, false on failure.
*/
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 );
}
/**
* Changes the owner of a file or directory.
*
* @since 2.7.0
*
* @param string $file Path to the file or directory.
* @param string|int $owner A user name or number.
* @param bool $recursive Optional. If set to true, changes file owner recursively.
* Default false.
* @return bool True on success, 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 );
}
/**
* Gets the file owner.
*
* @since 2.7.0
*
* @param string $file Path to the file.
* @return string|false Username of the owner on success, false on failure.
*/
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 );
if ( ! $ownerarray ) {
return false;
}
return $ownerarray['name'];
}
/**
* Gets the permissions of the specified file or filepath in their octal format.
*
* @since 2.7.0
*
* @param string $file Path to the file.
* @return string Mode of the file (the last 3 digits).
*/
public function getchmod( $file ) {
return substr( decoct( @fileperms( $this->sftp_path( $file ) ) ), -3 );
}
/**
* Gets the file's group.
*
* @since 2.7.0
*
* @param string $file Path to the file.
* @return string|false The group on success, false on failure.
*/
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 );
if ( ! $grouparray ) {
return false;
}
return $grouparray['name'];
}
/**
* Copies a file.
*
* @since 2.7.0
*
* @param string $source Path to the source file.
* @param string $destination Path to the destination file.
* @param bool $overwrite Optional. Whether to overwrite the destination file if it exists.
* Default false.
* @param int|false $mode Optional. The permissions as octal number, usually 0644 for files,
* 0755 for dirs. Default false.
* @return bool True on success, false on failure.
*/
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 );
}
/**
* Moves a file or directory.
*
* After moving files or directories, OPcache will need to be invalidated.
*
* If moving a directory fails, `copy_dir()` can be used for a recursive copy.
*
* Use `move_dir()` for moving directories with OPcache invalidation and a
* fallback to `copy_dir()`.
*
* @since 2.7.0
*
* @param string $source Path to the source file or directory.
* @param string $destination Path to the destination file or directory.
* @param bool $overwrite Optional. Whether to overwrite the destination if it exists.
* Default false.
* @return bool True on success, false on failure.
*/
public function move( $source, $destination, $overwrite = false ) {
if ( $this->exists( $destination ) ) {
if ( $overwrite ) {
// We need to remove the destination before we can rename the source.
$this->delete( $destination, false, 'f' );
} else {
// If we're not overwriting, the rename will fail, so return early.
return false;
}
}
return ssh2_sftp_rename( $this->sftp_link, $source, $destination );
}
/**
* Deletes a file or directory.
*
* @since 2.7.0
*
* @param string $file Path to the file or directory.
* @param bool $recursive Optional. If set to true, deletes files and folders recursively.
* Default false.
* @param string|false $type Type of resource. 'f' for file, 'd' for directory.
* Default false.
* @return bool True on success, false on failure.
*/
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 );
}
/**
* Checks if a file or directory exists.
*
* @since 2.7.0
*
* @param string $path Path to file or directory.
* @return bool Whether $path exists or not.
*/
public function exists( $path ) {
return file_exists( $this->sftp_path( $path ) );
}
/**
* Checks if resource is a file.
*
* @since 2.7.0
*
* @param string $file File path.
* @return bool Whether $file is a file.
*/
public function is_file( $file ) {
return is_file( $this->sftp_path( $file ) );
}
/**
* Checks if resource is a directory.
*
* @since 2.7.0
*
* @param string $path Directory path.
* @return bool Whether $path is a directory.
*/
public function is_dir( $path ) {
return is_dir( $this->sftp_path( $path ) );
}
/**
* Checks if a file is readable.
*
* @since 2.7.0
*
* @param string $file Path to file.
* @return bool Whether $file is readable.
*/
public function is_readable( $file ) {
return is_readable( $this->sftp_path( $file ) );
}
/**
* Checks if a file or directory is writable.
*
* @since 2.7.0
*
* @param string $path Path to file or directory.
* @return bool Whether $path is writable.
*/
public function is_writable( $path ) {
// PHP will base its writable checks on system_user === file_owner, not ssh_user === file_owner.
return true;
}
/**
* Gets the file's last access time.
*
* @since 2.7.0
*
* @param string $file Path to file.
* @return int|false Unix timestamp representing last access time, false on failure.
*/
public function atime( $file ) {
return fileatime( $this->sftp_path( $file ) );
}
/**
* Gets the file modification time.
*
* @since 2.7.0
*
* @param string $file Path to file.
* @return int|false Unix timestamp representing modification time, false on failure.
*/
public function mtime( $file ) {
return filemtime( $this->sftp_path( $file ) );
}
/**
* Gets the file size (in bytes).
*
* @since 2.7.0
*
* @param string $file Path to file.
* @return int|false Size of the file in bytes on success, false on failure.
*/
public function size( $file ) {
return filesize( $this->sftp_path( $file ) );
}
/**
* Sets the access and modification times of a file.
*
* Note: Not implemented.
*
* @since 2.7.0
*
* @param string $file Path to file.
* @param int $time Optional. Modified time to set for file.
* Default 0.
* @param int $atime Optional. Access time to set for file.
* Default 0.
*/
public function touch( $file, $time = 0, $atime = 0 ) {
// Not implemented.
}
/**
* Creates a directory.
*
* @since 2.7.0
*
* @param string $path Path for new directory.
* @param int|false $chmod Optional. The permissions as octal number (or false to skip chmod).
* Default false.
* @param string|int|false $chown Optional. A user name or number (or false to skip chown).
* Default false.
* @param string|int|false $chgrp Optional. A group name or number (or false to skip chgrp).
* Default false.
* @return bool True on success, false on failure.
*/
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;
}
// Set directory permissions.
ssh2_sftp_chmod( $this->sftp_link, $path, $chmod );
if ( $chown ) {
$this->chown( $path, $chown );
}
if ( $chgrp ) {
$this->chgrp( $path, $chgrp );
}
return true;
}
/**
* Deletes a directory.
*
* @since 2.7.0
*
* @param string $path Path to directory.
* @param bool $recursive Optional. Whether to recursively remove files/directories.
* Default false.
* @return bool True on success, false on failure.
*/
public function rmdir( $path, $recursive = false ) {
return $this->delete( $path, $recursive );
}
/**
* Gets details for files in a directory or a specific file.
*
* @since 2.7.0
*
* @param string $path Path to directory or file.
* @param bool $include_hidden Optional. Whether to include details of hidden ("." prefixed) files.
* Default true.
* @param bool $recursive Optional. Whether to recursively include file details in nested directories.
* Default false.
* @return array|false {
* Array of arrays containing file information. False if unable to list directory contents.
*
* @type array ...$0 {
* Array of file information. Note that some elements may not be available on all filesystems.
*
* @type string $name Name of the file or directory.
* @type string $perms *nix representation of permissions.
* @type string $permsn Octal representation of permissions.
* @type false $number File number. Always false in this context.
* @type string|false $owner Owner name or ID, or false if not available.
* @type string|false $group File permissions group, or false if not available.
* @type int|string|false $size Size of file in bytes. May be a numeric string.
* False if not available.
* @type int|string|false $lastmodunix Last modified unix timestamp. May be a numeric string.
* False if not available.
* @type string|false $lastmod Last modified month (3 letters) and day (without leading 0), or
* false if not available.
* @type string|false $time Last modified time, or false if not available.
* @type string $type Type of resource. 'f' for file, 'd' for directory, 'l' for link.
* @type array|false $files If a directory and `$recursive` is true, contains another array of
* files. False if unable to list directory contents.
* }
* }
*/
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 ) || ! $this->is_readable( $path ) ) {
return false;
}
$ret = array();
$dir = dir( $this->sftp_path( $path ) );
if ( ! $dir ) {
return false;
}
$path = trailingslashit( $path );
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'] = gmdate( 'M j', $struc['lastmodunix'] );
$struc['time'] = gmdate( '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;
}
}
