class-wp-filesystem-ssh2.php 15.2 KB
Newer Older
imac's avatar
imac committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631
<?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;
	}
}