* login('username', 'password')) { * exit('Login Failed'); * } * * echo $ssh->exec('ls -la'); * ?> * * * Here's another short example: * * login('username', 'password')) { * exit('Login Failed'); * } * * echo $ssh->read('username@username:~$'); * $ssh->write("ls -la\n"); * echo $ssh->read('username@username:~$'); * ?> * * * More information on the SSHv1 specification can be found by reading * {@link http://www.snailbook.com/docs/protocol-1.5.txt protocol-1.5.txt}. * * @category Net * @package SSH1 * @author Jim Wigginton * @copyright 2007 Jim Wigginton * @license http://www.opensource.org/licenses/mit-license.html MIT License * @link http://phpseclib.sourceforge.net */ namespace phpseclib\Net; use phpseclib\Crypt\DES; use phpseclib\Crypt\Random; use phpseclib\Crypt\TripleDES; use phpseclib\Math\BigInteger; /** * Pure-PHP implementation of SSHv1. * * @package SSH1 * @author Jim Wigginton * @access public */ class SSH1 { /**#@+ * Encryption Methods * * @see \phpseclib\Net\SSH1::getSupportedCiphers() * @access public */ /** * No encryption * * Not supported. */ const CIPHER_NONE = 0; /** * IDEA in CFB mode * * Not supported. */ const CIPHER_IDEA = 1; /** * DES in CBC mode */ const CIPHER_DES = 2; /** * Triple-DES in CBC mode * * All implementations are required to support this */ const CIPHER_3DES = 3; /** * TRI's Simple Stream encryption CBC * * Not supported nor is it defined in the official SSH1 specs. OpenSSH, however, does define it (see cipher.h), * although it doesn't use it (see cipher.c) */ const CIPHER_BROKEN_TSS = 4; /** * RC4 * * Not supported. * * @internal According to the SSH1 specs: * * "The first 16 bytes of the session key are used as the key for * the server to client direction. The remaining 16 bytes are used * as the key for the client to server direction. This gives * independent 128-bit keys for each direction." * * This library currently only supports encryption when the same key is being used for both directions. This is * because there's only one $crypto object. Two could be added ($encrypt and $decrypt, perhaps). */ const CIPHER_RC4 = 5; /** * Blowfish * * Not supported nor is it defined in the official SSH1 specs. OpenSSH, however, defines it (see cipher.h) and * uses it (see cipher.c) */ const CIPHER_BLOWFISH = 6; /**#@-*/ /**#@+ * Authentication Methods * * @see \phpseclib\Net\SSH1::getSupportedAuthentications() * @access public */ /** * .rhosts or /etc/hosts.equiv */ const AUTH_RHOSTS = 1; /** * pure RSA authentication */ const AUTH_RSA = 2; /** * password authentication * * This is the only method that is supported by this library. */ const AUTH_PASSWORD = 3; /** * .rhosts with RSA host authentication */ const AUTH_RHOSTS_RSA = 4; /**#@-*/ /**#@+ * Terminal Modes * * @link http://3sp.com/content/developer/maverick-net/docs/Maverick.SSH.PseudoTerminalModesMembers.html * @access private */ const TTY_OP_END = 0; /**#@-*/ /** * The Response Type * * @see \phpseclib\Net\SSH1::_get_binary_packet() * @access private */ const RESPONSE_TYPE = 1; /** * The Response Data * * @see \phpseclib\Net\SSH1::_get_binary_packet() * @access private */ const RESPONSE_DATA = 2; /**#@+ * Execution Bitmap Masks * * @see \phpseclib\Net\SSH1::bitmap * @access private */ const MASK_CONSTRUCTOR = 0x00000001; const MASK_CONNECTED = 0x00000002; const MASK_LOGIN = 0x00000004; const MASK_SHELL = 0x00000008; /**#@-*/ /**#@+ * @access public * @see \phpseclib\Net\SSH1::getLog() */ /** * Returns the message numbers */ const LOG_SIMPLE = 1; /** * Returns the message content */ const LOG_COMPLEX = 2; /** * Outputs the content real-time */ const LOG_REALTIME = 3; /** * Dumps the content real-time to a file */ const LOG_REALTIME_FILE = 4; /**#@-*/ /**#@+ * @access public * @see \phpseclib\Net\SSH1::read() */ /** * Returns when a string matching $expect exactly is found */ const READ_SIMPLE = 1; /** * Returns when a string matching the regular expression $expect is found */ const READ_REGEX = 2; /**#@-*/ /** * The SSH identifier * * @var string * @access private */ var $identifier = 'SSH-1.5-phpseclib'; /** * The Socket Object * * @var object * @access private */ var $fsock; /** * The cryptography object * * @var object * @access private */ var $crypto = false; /** * Execution Bitmap * * The bits that are set represent functions that have been called already. This is used to determine * if a requisite function has been successfully executed. If not, an error should be thrown. * * @var int * @access private */ var $bitmap = 0; /** * The Server Key Public Exponent * * Logged for debug purposes * * @see self::getServerKeyPublicExponent() * @var string * @access private */ var $server_key_public_exponent; /** * The Server Key Public Modulus * * Logged for debug purposes * * @see self::getServerKeyPublicModulus() * @var string * @access private */ var $server_key_public_modulus; /** * The Host Key Public Exponent * * Logged for debug purposes * * @see self::getHostKeyPublicExponent() * @var string * @access private */ var $host_key_public_exponent; /** * The Host Key Public Modulus * * Logged for debug purposes * * @see self::getHostKeyPublicModulus() * @var string * @access private */ var $host_key_public_modulus; /** * Supported Ciphers * * Logged for debug purposes * * @see self::getSupportedCiphers() * @var array * @access private */ var $supported_ciphers = array( self::CIPHER_NONE => 'No encryption', self::CIPHER_IDEA => 'IDEA in CFB mode', self::CIPHER_DES => 'DES in CBC mode', self::CIPHER_3DES => 'Triple-DES in CBC mode', self::CIPHER_BROKEN_TSS => 'TRI\'s Simple Stream encryption CBC', self::CIPHER_RC4 => 'RC4', self::CIPHER_BLOWFISH => 'Blowfish' ); /** * Supported Authentications * * Logged for debug purposes * * @see self::getSupportedAuthentications() * @var array * @access private */ var $supported_authentications = array( self::AUTH_RHOSTS => '.rhosts or /etc/hosts.equiv', self::AUTH_RSA => 'pure RSA authentication', self::AUTH_PASSWORD => 'password authentication', self::AUTH_RHOSTS_RSA => '.rhosts with RSA host authentication' ); /** * Server Identification * * @see self::getServerIdentification() * @var string * @access private */ var $server_identification = ''; /** * Protocol Flags * * @see self::__construct() * @var array * @access private */ var $protocol_flags = array(); /** * Protocol Flag Log * * @see self::getLog() * @var array * @access private */ var $protocol_flag_log = array(); /** * Message Log * * @see self::getLog() * @var array * @access private */ var $message_log = array(); /** * Real-time log file pointer * * @see self::_append_log() * @var resource * @access private */ var $realtime_log_file; /** * Real-time log file size * * @see self::_append_log() * @var int * @access private */ var $realtime_log_size; /** * Real-time log file wrap boolean * * @see self::_append_log() * @var bool * @access private */ var $realtime_log_wrap; /** * Interactive Buffer * * @see self::read() * @var array * @access private */ var $interactiveBuffer = ''; /** * Timeout * * @see self::setTimeout() * @access private */ var $timeout; /** * Current Timeout * * @see self::_get_channel_packet() * @access private */ var $curTimeout; /** * Log Boundary * * @see self::_format_log() * @access private */ var $log_boundary = ':'; /** * Log Long Width * * @see self::_format_log() * @access private */ var $log_long_width = 65; /** * Log Short Width * * @see self::_format_log() * @access private */ var $log_short_width = 16; /** * Hostname * * @see self::__construct() * @see self::_connect() * @var string * @access private */ var $host; /** * Port Number * * @see self::__construct() * @see self::_connect() * @var int * @access private */ var $port; /** * Timeout for initial connection * * Set by the constructor call. Calling setTimeout() is optional. If it's not called functions like * exec() won't timeout unless some PHP setting forces it too. The timeout specified in the constructor, * however, is non-optional. There will be a timeout, whether or not you set it. If you don't it'll be * 10 seconds. It is used by fsockopen() in that function. * * @see self::__construct() * @see self::_connect() * @var int * @access private */ var $connectionTimeout; /** * Default cipher * * @see self::__construct() * @see self::_connect() * @var int * @access private */ var $cipher; /** * Default Constructor. * * Connects to an SSHv1 server * * @param string $host * @param int $port * @param int $timeout * @param int $cipher * @return \phpseclib\Net\SSH1 * @access public */ function __construct($host, $port = 22, $timeout = 10, $cipher = self::CIPHER_3DES) { $this->protocol_flags = array( 1 => 'NET_SSH1_MSG_DISCONNECT', 2 => 'NET_SSH1_SMSG_PUBLIC_KEY', 3 => 'NET_SSH1_CMSG_SESSION_KEY', 4 => 'NET_SSH1_CMSG_USER', 9 => 'NET_SSH1_CMSG_AUTH_PASSWORD', 10 => 'NET_SSH1_CMSG_REQUEST_PTY', 12 => 'NET_SSH1_CMSG_EXEC_SHELL', 13 => 'NET_SSH1_CMSG_EXEC_CMD', 14 => 'NET_SSH1_SMSG_SUCCESS', 15 => 'NET_SSH1_SMSG_FAILURE', 16 => 'NET_SSH1_CMSG_STDIN_DATA', 17 => 'NET_SSH1_SMSG_STDOUT_DATA', 18 => 'NET_SSH1_SMSG_STDERR_DATA', 19 => 'NET_SSH1_CMSG_EOF', 20 => 'NET_SSH1_SMSG_EXITSTATUS', 33 => 'NET_SSH1_CMSG_EXIT_CONFIRMATION' ); $this->_define_array($this->protocol_flags); $this->host = $host; $this->port = $port; $this->connectionTimeout = $timeout; $this->cipher = $cipher; } /** * Connect to an SSHv1 server * * @return bool * @access private */ function _connect() { $this->fsock = @fsockopen($this->host, $this->port, $errno, $errstr, $this->connectionTimeout); if (!$this->fsock) { user_error(rtrim("Cannot connect to {$this->host}:{$this->port}. Error $errno. $errstr")); return false; } $this->server_identification = $init_line = fgets($this->fsock, 255); if (defined('NET_SSH1_LOGGING')) { $this->_append_log('<-', $this->server_identification); $this->_append_log('->', $this->identifier . "\r\n"); } if (!preg_match('#SSH-([0-9\.]+)-(.+)#', $init_line, $parts)) { user_error('Can only connect to SSH servers'); return false; } if ($parts[1][0] != 1) { user_error("Cannot connect to SSH $parts[1] servers"); return false; } fputs($this->fsock, $this->identifier."\r\n"); $response = $this->_get_binary_packet(); if ($response[self::RESPONSE_TYPE] != NET_SSH1_SMSG_PUBLIC_KEY) { user_error('Expected SSH_SMSG_PUBLIC_KEY'); return false; } $anti_spoofing_cookie = $this->_string_shift($response[self::RESPONSE_DATA], 8); $this->_string_shift($response[self::RESPONSE_DATA], 4); if (strlen($response[self::RESPONSE_DATA]) < 2) { return false; } $temp = unpack('nlen', $this->_string_shift($response[self::RESPONSE_DATA], 2)); $server_key_public_exponent = new BigInteger($this->_string_shift($response[self::RESPONSE_DATA], ceil($temp['len'] / 8)), 256); $this->server_key_public_exponent = $server_key_public_exponent; if (strlen($response[self::RESPONSE_DATA]) < 2) { return false; } $temp = unpack('nlen', $this->_string_shift($response[self::RESPONSE_DATA], 2)); $server_key_public_modulus = new BigInteger($this->_string_shift($response[self::RESPONSE_DATA], ceil($temp['len'] / 8)), 256); $this->server_key_public_modulus = $server_key_public_modulus; $this->_string_shift($response[self::RESPONSE_DATA], 4); if (strlen($response[self::RESPONSE_DATA]) < 2) { return false; } $temp = unpack('nlen', $this->_string_shift($response[self::RESPONSE_DATA], 2)); $host_key_public_exponent = new BigInteger($this->_string_shift($response[self::RESPONSE_DATA], ceil($temp['len'] / 8)), 256); $this->host_key_public_exponent = $host_key_public_exponent; if (strlen($response[self::RESPONSE_DATA]) < 2) { return false; } $temp = unpack('nlen', $this->_string_shift($response[self::RESPONSE_DATA], 2)); $host_key_public_modulus = new BigInteger($this->_string_shift($response[self::RESPONSE_DATA], ceil($temp['len'] / 8)), 256); $this->host_key_public_modulus = $host_key_public_modulus; $this->_string_shift($response[self::RESPONSE_DATA], 4); // get a list of the supported ciphers if (strlen($response[self::RESPONSE_DATA]) < 4) { return false; } extract(unpack('Nsupported_ciphers_mask', $this->_string_shift($response[self::RESPONSE_DATA], 4))); foreach ($this->supported_ciphers as $mask => $name) { if (($supported_ciphers_mask & (1 << $mask)) == 0) { unset($this->supported_ciphers[$mask]); } } // get a list of the supported authentications if (strlen($response[self::RESPONSE_DATA]) < 4) { return false; } extract(unpack('Nsupported_authentications_mask', $this->_string_shift($response[self::RESPONSE_DATA], 4))); foreach ($this->supported_authentications as $mask => $name) { if (($supported_authentications_mask & (1 << $mask)) == 0) { unset($this->supported_authentications[$mask]); } } $session_id = pack('H*', md5($host_key_public_modulus->toBytes() . $server_key_public_modulus->toBytes() . $anti_spoofing_cookie)); $session_key = Random::string(32); $double_encrypted_session_key = $session_key ^ str_pad($session_id, 32, chr(0)); if ($server_key_public_modulus->compare($host_key_public_modulus) < 0) { $double_encrypted_session_key = $this->_rsa_crypt( $double_encrypted_session_key, array( $server_key_public_exponent, $server_key_public_modulus ) ); $double_encrypted_session_key = $this->_rsa_crypt( $double_encrypted_session_key, array( $host_key_public_exponent, $host_key_public_modulus ) ); } else { $double_encrypted_session_key = $this->_rsa_crypt( $double_encrypted_session_key, array( $host_key_public_exponent, $host_key_public_modulus ) ); $double_encrypted_session_key = $this->_rsa_crypt( $double_encrypted_session_key, array( $server_key_public_exponent, $server_key_public_modulus ) ); } $cipher = isset($this->supported_ciphers[$this->cipher]) ? $this->cipher : self::CIPHER_3DES; $data = pack('C2a*na*N', NET_SSH1_CMSG_SESSION_KEY, $cipher, $anti_spoofing_cookie, 8 * strlen($double_encrypted_session_key), $double_encrypted_session_key, 0); if (!$this->_send_binary_packet($data)) { user_error('Error sending SSH_CMSG_SESSION_KEY'); return false; } switch ($cipher) { //case self::CIPHER_NONE: // $this->crypto = new \phpseclib\Crypt\Null(); // break; case self::CIPHER_DES: $this->crypto = new DES(); $this->crypto->disablePadding(); $this->crypto->enableContinuousBuffer(); $this->crypto->setKey(substr($session_key, 0, 8)); break; case self::CIPHER_3DES: $this->crypto = new TripleDES(TripleDES::MODE_3CBC); $this->crypto->disablePadding(); $this->crypto->enableContinuousBuffer(); $this->crypto->setKey(substr($session_key, 0, 24)); break; //case self::CIPHER_RC4: // $this->crypto = new RC4(); // $this->crypto->enableContinuousBuffer(); // $this->crypto->setKey(substr($session_key, 0, 16)); // break; } $response = $this->_get_binary_packet(); if ($response[self::RESPONSE_TYPE] != NET_SSH1_SMSG_SUCCESS) { user_error('Expected SSH_SMSG_SUCCESS'); return false; } $this->bitmap = self::MASK_CONNECTED; return true; } /** * Login * * @param string $username * @param string $password * @return bool * @access public */ function login($username, $password = '') { if (!($this->bitmap & self::MASK_CONSTRUCTOR)) { $this->bitmap |= self::MASK_CONSTRUCTOR; if (!$this->_connect()) { return false; } } if (!($this->bitmap & self::MASK_CONNECTED)) { return false; } $data = pack('CNa*', NET_SSH1_CMSG_USER, strlen($username), $username); if (!$this->_send_binary_packet($data)) { user_error('Error sending SSH_CMSG_USER'); return false; } $response = $this->_get_binary_packet(); if ($response === true) { return false; } if ($response[self::RESPONSE_TYPE] == NET_SSH1_SMSG_SUCCESS) { $this->bitmap |= self::MASK_LOGIN; return true; } elseif ($response[self::RESPONSE_TYPE] != NET_SSH1_SMSG_FAILURE) { user_error('Expected SSH_SMSG_SUCCESS or SSH_SMSG_FAILURE'); return false; } $data = pack('CNa*', NET_SSH1_CMSG_AUTH_PASSWORD, strlen($password), $password); if (!$this->_send_binary_packet($data)) { user_error('Error sending SSH_CMSG_AUTH_PASSWORD'); return false; } // remove the username and password from the last logged packet if (defined('NET_SSH1_LOGGING') && NET_SSH1_LOGGING == self::LOG_COMPLEX) { $data = pack('CNa*', NET_SSH1_CMSG_AUTH_PASSWORD, strlen('password'), 'password'); $this->message_log[count($this->message_log) - 1] = $data; } $response = $this->_get_binary_packet(); if ($response === true) { return false; } if ($response[self::RESPONSE_TYPE] == NET_SSH1_SMSG_SUCCESS) { $this->bitmap |= self::MASK_LOGIN; return true; } elseif ($response[self::RESPONSE_TYPE] == NET_SSH1_SMSG_FAILURE) { return false; } else { user_error('Expected SSH_SMSG_SUCCESS or SSH_SMSG_FAILURE'); return false; } } /** * Set Timeout * * $ssh->exec('ping 127.0.0.1'); on a Linux host will never return and will run indefinitely. setTimeout() makes it so it'll timeout. * Setting $timeout to false or 0 will mean there is no timeout. * * @param mixed $timeout */ function setTimeout($timeout) { $this->timeout = $this->curTimeout = $timeout; } /** * Executes a command on a non-interactive shell, returns the output, and quits. * * An SSH1 server will close the connection after a command has been executed on a non-interactive shell. SSH2 * servers don't, however, this isn't an SSH2 client. The way this works, on the server, is by initiating a * shell with the -s option, as discussed in the following links: * * {@link http://www.faqs.org/docs/bashman/bashref_65.html http://www.faqs.org/docs/bashman/bashref_65.html} * {@link http://www.faqs.org/docs/bashman/bashref_62.html http://www.faqs.org/docs/bashman/bashref_62.html} * * To execute further commands, a new \phpseclib\Net\SSH1 object will need to be created. * * Returns false on failure and the output, otherwise. * * @see self::interactiveRead() * @see self::interactiveWrite() * @param string $cmd * @return mixed * @access public */ function exec($cmd, $block = true) { if (!($this->bitmap & self::MASK_LOGIN)) { user_error('Operation disallowed prior to login()'); return false; } $data = pack('CNa*', NET_SSH1_CMSG_EXEC_CMD, strlen($cmd), $cmd); if (!$this->_send_binary_packet($data)) { user_error('Error sending SSH_CMSG_EXEC_CMD'); return false; } if (!$block) { return true; } $output = ''; $response = $this->_get_binary_packet(); if ($response !== false) { do { $output.= substr($response[self::RESPONSE_DATA], 4); $response = $this->_get_binary_packet(); } while (is_array($response) && $response[self::RESPONSE_TYPE] != NET_SSH1_SMSG_EXITSTATUS); } $data = pack('C', NET_SSH1_CMSG_EXIT_CONFIRMATION); // i don't think it's really all that important if this packet gets sent or not. $this->_send_binary_packet($data); fclose($this->fsock); // reset the execution bitmap - a new \phpseclib\Net\SSH1 object needs to be created. $this->bitmap = 0; return $output; } /** * Creates an interactive shell * * @see self::interactiveRead() * @see self::interactiveWrite() * @return bool * @access private */ function _initShell() { // connect using the sample parameters in protocol-1.5.txt. // according to wikipedia.org's entry on text terminals, "the fundamental type of application running on a text // terminal is a command line interpreter or shell". thus, opening a terminal session to run the shell. $data = pack('CNa*N4C', NET_SSH1_CMSG_REQUEST_PTY, strlen('vt100'), 'vt100', 24, 80, 0, 0, self::TTY_OP_END); if (!$this->_send_binary_packet($data)) { user_error('Error sending SSH_CMSG_REQUEST_PTY'); return false; } $response = $this->_get_binary_packet(); if ($response === true) { return false; } if ($response[self::RESPONSE_TYPE] != NET_SSH1_SMSG_SUCCESS) { user_error('Expected SSH_SMSG_SUCCESS'); return false; } $data = pack('C', NET_SSH1_CMSG_EXEC_SHELL); if (!$this->_send_binary_packet($data)) { user_error('Error sending SSH_CMSG_EXEC_SHELL'); return false; } $this->bitmap |= self::MASK_SHELL; //stream_set_blocking($this->fsock, 0); return true; } /** * Inputs a command into an interactive shell. * * @see self::interactiveWrite() * @param string $cmd * @return bool * @access public */ function write($cmd) { return $this->interactiveWrite($cmd); } /** * Returns the output of an interactive shell when there's a match for $expect * * $expect can take the form of a string literal or, if $mode == self::READ__REGEX, * a regular expression. * * @see self::write() * @param string $expect * @param int $mode * @return bool * @access public */ function read($expect, $mode = self::READ__SIMPLE) { if (!($this->bitmap & self::MASK_LOGIN)) { user_error('Operation disallowed prior to login()'); return false; } if (!($this->bitmap & self::MASK_SHELL) && !$this->_initShell()) { user_error('Unable to initiate an interactive shell session'); return false; } $match = $expect; while (true) { if ($mode == self::READ__REGEX) { preg_match($expect, $this->interactiveBuffer, $matches); $match = isset($matches[0]) ? $matches[0] : ''; } $pos = strlen($match) ? strpos($this->interactiveBuffer, $match) : false; if ($pos !== false) { return $this->_string_shift($this->interactiveBuffer, $pos + strlen($match)); } $response = $this->_get_binary_packet(); if ($response === true) { return $this->_string_shift($this->interactiveBuffer, strlen($this->interactiveBuffer)); } $this->interactiveBuffer.= substr($response[self::RESPONSE_DATA], 4); } } /** * Inputs a command into an interactive shell. * * @see self::interactiveRead() * @param string $cmd * @return bool * @access public */ function interactiveWrite($cmd) { if (!($this->bitmap & self::MASK_LOGIN)) { user_error('Operation disallowed prior to login()'); return false; } if (!($this->bitmap & self::MASK_SHELL) && !$this->_initShell()) { user_error('Unable to initiate an interactive shell session'); return false; } $data = pack('CNa*', NET_SSH1_CMSG_STDIN_DATA, strlen($cmd), $cmd); if (!$this->_send_binary_packet($data)) { user_error('Error sending SSH_CMSG_STDIN'); return false; } return true; } /** * Returns the output of an interactive shell when no more output is available. * * Requires PHP 4.3.0 or later due to the use of the stream_select() function. If you see stuff like * "^[[00m", you're seeing ANSI escape codes. According to * {@link http://support.microsoft.com/kb/101875 How to Enable ANSI.SYS in a Command Window}, "Windows NT * does not support ANSI escape sequences in Win32 Console applications", so if you're a Windows user, * there's not going to be much recourse. * * @see self::interactiveRead() * @return string * @access public */ function interactiveRead() { if (!($this->bitmap & self::MASK_LOGIN)) { user_error('Operation disallowed prior to login()'); return false; } if (!($this->bitmap & self::MASK_SHELL) && !$this->_initShell()) { user_error('Unable to initiate an interactive shell session'); return false; } $read = array($this->fsock); $write = $except = null; if (stream_select($read, $write, $except, 0)) { $response = $this->_get_binary_packet(); return substr($response[self::RESPONSE_DATA], 4); } else { return ''; } } /** * Disconnect * * @access public */ function disconnect() { $this->_disconnect(); } /** * Destructor. * * Will be called, automatically, if you're supporting just PHP5. If you're supporting PHP4, you'll need to call * disconnect(). * * @access public */ function __destruct() { $this->_disconnect(); } /** * Disconnect * * @param string $msg * @access private */ function _disconnect($msg = 'Client Quit') { if ($this->bitmap) { $data = pack('C', NET_SSH1_CMSG_EOF); $this->_send_binary_packet($data); /* $response = $this->_get_binary_packet(); if ($response === true) { $response = array(self::RESPONSE_TYPE => -1); } switch ($response[self::RESPONSE_TYPE]) { case NET_SSH1_SMSG_EXITSTATUS: $data = pack('C', NET_SSH1_CMSG_EXIT_CONFIRMATION); break; default: $data = pack('CNa*', NET_SSH1_MSG_DISCONNECT, strlen($msg), $msg); } */ $data = pack('CNa*', NET_SSH1_MSG_DISCONNECT, strlen($msg), $msg); $this->_send_binary_packet($data); fclose($this->fsock); $this->bitmap = 0; } } /** * Gets Binary Packets * * See 'The Binary Packet Protocol' of protocol-1.5.txt for more info. * * Also, this function could be improved upon by adding detection for the following exploit: * http://www.securiteam.com/securitynews/5LP042K3FY.html * * @see self::_send_binary_packet() * @return array * @access private */ function _get_binary_packet() { if (feof($this->fsock)) { //user_error('connection closed prematurely'); return false; } if ($this->curTimeout) { $read = array($this->fsock); $write = $except = null; $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838 $sec = floor($this->curTimeout); $usec = 1000000 * ($this->curTimeout - $sec); // on windows this returns a "Warning: Invalid CRT parameters detected" error if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) { //$this->_disconnect('Timeout'); return true; } $elapsed = strtok(microtime(), ' ') + strtok('') - $start; $this->curTimeout-= $elapsed; } $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838 $data = fread($this->fsock, 4); if (strlen($data) < 4) { return false; } $temp = unpack('Nlength', $data); $padding_length = 8 - ($temp['length'] & 7); $length = $temp['length'] + $padding_length; $raw = ''; while ($length > 0) { $temp = fread($this->fsock, $length); $raw.= $temp; $length-= strlen($temp); } $stop = strtok(microtime(), ' ') + strtok(''); if (strlen($raw) && $this->crypto !== false) { $raw = $this->crypto->decrypt($raw); } $padding = substr($raw, 0, $padding_length); $type = $raw[$padding_length]; $data = substr($raw, $padding_length + 1, -4); if (strlen($raw) < 4) { return false; } $temp = unpack('Ncrc', substr($raw, -4)); //if ( $temp['crc'] != $this->_crc($padding . $type . $data) ) { // user_error('Bad CRC in packet from server'); // return false; //} $type = ord($type); if (defined('NET_SSH1_LOGGING')) { $temp = isset($this->protocol_flags[$type]) ? $this->protocol_flags[$type] : 'UNKNOWN'; $temp = '<- ' . $temp . ' (' . round($stop - $start, 4) . 's)'; $this->_append_log($temp, $data); } return array( self::RESPONSE_TYPE => $type, self::RESPONSE_DATA => $data ); } /** * Sends Binary Packets * * Returns true on success, false on failure. * * @see self::_get_binary_packet() * @param string $data * @return bool * @access private */ function _send_binary_packet($data) { if (feof($this->fsock)) { //user_error('connection closed prematurely'); return false; } $length = strlen($data) + 4; $padding = Random::string(8 - ($length & 7)); $orig = $data; $data = $padding . $data; $data.= pack('N', $this->_crc($data)); if ($this->crypto !== false) { $data = $this->crypto->encrypt($data); } $packet = pack('Na*', $length, $data); $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838 $result = strlen($packet) == fputs($this->fsock, $packet); $stop = strtok(microtime(), ' ') + strtok(''); if (defined('NET_SSH1_LOGGING')) { $temp = isset($this->protocol_flags[ord($orig[0])]) ? $this->protocol_flags[ord($orig[0])] : 'UNKNOWN'; $temp = '-> ' . $temp . ' (' . round($stop - $start, 4) . 's)'; $this->_append_log($temp, $orig); } return $result; } /** * Cyclic Redundancy Check (CRC) * * PHP's crc32 function is implemented slightly differently than the one that SSH v1 uses, so * we've reimplemented it. A more detailed discussion of the differences can be found after * $crc_lookup_table's initialization. * * @see self::_get_binary_packet() * @see self::_send_binary_packet() * @param string $data * @return int * @access private */ function _crc($data) { static $crc_lookup_table = array( 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D ); // For this function to yield the same output as PHP's crc32 function, $crc would have to be // set to 0xFFFFFFFF, initially - not 0x00000000 as it currently is. $crc = 0x00000000; $length = strlen($data); for ($i=0; $i<$length; $i++) { // We AND $crc >> 8 with 0x00FFFFFF because we want the eight newly added bits to all // be zero. PHP, unfortunately, doesn't always do this. 0x80000000 >> 8, as an example, // yields 0xFF800000 - not 0x00800000. The following link elaborates: // http://www.php.net/manual/en/language.operators.bitwise.php#57281 $crc = (($crc >> 8) & 0x00FFFFFF) ^ $crc_lookup_table[($crc & 0xFF) ^ ord($data[$i])]; } // In addition to having to set $crc to 0xFFFFFFFF, initially, the return value must be XOR'd with // 0xFFFFFFFF for this function to return the same thing that PHP's crc32 function would. return $crc; } /** * String Shift * * Inspired by array_shift * * @param string $string * @param int $index * @return string * @access private */ function _string_shift(&$string, $index = 1) { $substr = substr($string, 0, $index); $string = substr($string, $index); return $substr; } /** * RSA Encrypt * * Returns mod(pow($m, $e), $n), where $n should be the product of two (large) primes $p and $q and where $e * should be a number with the property that gcd($e, ($p - 1) * ($q - 1)) == 1. Could just make anything that * calls this call modexp, instead, but I think this makes things clearer, maybe... * * @see self::__construct() * @param BigInteger $m * @param array $key * @return BigInteger * @access private */ function _rsa_crypt($m, $key) { /* $rsa = new RSA(); $rsa->loadKey($key, RSA::PUBLIC_FORMAT_RAW); $rsa->setEncryptionMode(RSA::ENCRYPTION_PKCS1); return $rsa->encrypt($m); */ // To quote from protocol-1.5.txt: // The most significant byte (which is only partial as the value must be // less than the public modulus, which is never a power of two) is zero. // // The next byte contains the value 2 (which stands for public-key // encrypted data in the PKCS standard [PKCS#1]). Then, there are non- // zero random bytes to fill any unused space, a zero byte, and the data // to be encrypted in the least significant bytes, the last byte of the // data in the least significant byte. // Presumably the part of PKCS#1 they're refering to is "Section 7.2.1 Encryption Operation", // under "7.2 RSAES-PKCS1-v1.5" and "7 Encryption schemes" of the following URL: // ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1.pdf $modulus = $key[1]->toBytes(); $length = strlen($modulus) - strlen($m) - 3; $random = ''; while (strlen($random) != $length) { $block = Random::string($length - strlen($random)); $block = str_replace("\x00", '', $block); $random.= $block; } $temp = chr(0) . chr(2) . $random . chr(0) . $m; $m = new BigInteger($temp, 256); $m = $m->modPow($key[0], $key[1]); return $m->toBytes(); } /** * Define Array * * Takes any number of arrays whose indices are integers and whose values are strings and defines a bunch of * named constants from it, using the value as the name of the constant and the index as the value of the constant. * If any of the constants that would be defined already exists, none of the constants will be defined. * * @param array $array * @access private */ function _define_array() { $args = func_get_args(); foreach ($args as $arg) { foreach ($arg as $key => $value) { if (!defined($value)) { define($value, $key); } else { break 2; } } } } /** * Returns a log of the packets that have been sent and received. * * Returns a string if NET_SSH1_LOGGING == self::LOG_COMPLEX, an array if NET_SSH1_LOGGING == self::LOG_SIMPLE and false if !defined('NET_SSH1_LOGGING') * * @access public * @return array|false|string */ function getLog() { if (!defined('NET_SSH1_LOGGING')) { return false; } switch (NET_SSH1_LOGGING) { case self::LOG_SIMPLE: return $this->message_number_log; break; case self::LOG_COMPLEX: return $this->_format_log($this->message_log, $this->protocol_flags_log); break; default: return false; } } /** * Formats a log for printing * * @param array $message_log * @param array $message_number_log * @access private * @return string */ function _format_log($message_log, $message_number_log) { $output = ''; for ($i = 0; $i < count($message_log); $i++) { $output.= $message_number_log[$i] . "\r\n"; $current_log = $message_log[$i]; $j = 0; do { if (strlen($current_log)) { $output.= str_pad(dechex($j), 7, '0', STR_PAD_LEFT) . '0 '; } $fragment = $this->_string_shift($current_log, $this->log_short_width); $hex = substr(preg_replace_callback('#.#s', array($this, '_format_log_helper'), $fragment), strlen($this->log_boundary)); // replace non ASCII printable characters with dots // http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters // also replace < with a . since < messes up the output on web browsers $raw = preg_replace('#[^\x20-\x7E]|<#', '.', $fragment); $output.= str_pad($hex, $this->log_long_width - $this->log_short_width, ' ') . $raw . "\r\n"; $j++; } while (strlen($current_log)); $output.= "\r\n"; } return $output; } /** * Helper function for _format_log * * For use with preg_replace_callback() * * @param array $matches * @access private * @return string */ function _format_log_helper($matches) { return $this->log_boundary . str_pad(dechex(ord($matches[0])), 2, '0', STR_PAD_LEFT); } /** * Return the server key public exponent * * Returns, by default, the base-10 representation. If $raw_output is set to true, returns, instead, * the raw bytes. This behavior is similar to PHP's md5() function. * * @param bool $raw_output * @return string * @access public */ function getServerKeyPublicExponent($raw_output = false) { return $raw_output ? $this->server_key_public_exponent->toBytes() : $this->server_key_public_exponent->toString(); } /** * Return the server key public modulus * * Returns, by default, the base-10 representation. If $raw_output is set to true, returns, instead, * the raw bytes. This behavior is similar to PHP's md5() function. * * @param bool $raw_output * @return string * @access public */ function getServerKeyPublicModulus($raw_output = false) { return $raw_output ? $this->server_key_public_modulus->toBytes() : $this->server_key_public_modulus->toString(); } /** * Return the host key public exponent * * Returns, by default, the base-10 representation. If $raw_output is set to true, returns, instead, * the raw bytes. This behavior is similar to PHP's md5() function. * * @param bool $raw_output * @return string * @access public */ function getHostKeyPublicExponent($raw_output = false) { return $raw_output ? $this->host_key_public_exponent->toBytes() : $this->host_key_public_exponent->toString(); } /** * Return the host key public modulus * * Returns, by default, the base-10 representation. If $raw_output is set to true, returns, instead, * the raw bytes. This behavior is similar to PHP's md5() function. * * @param bool $raw_output * @return string * @access public */ function getHostKeyPublicModulus($raw_output = false) { return $raw_output ? $this->host_key_public_modulus->toBytes() : $this->host_key_public_modulus->toString(); } /** * Return a list of ciphers supported by SSH1 server. * * Just because a cipher is supported by an SSH1 server doesn't mean it's supported by this library. If $raw_output * is set to true, returns, instead, an array of constants. ie. instead of array('Triple-DES in CBC mode'), you'll * get array(self::CIPHER_3DES). * * @param bool $raw_output * @return array * @access public */ function getSupportedCiphers($raw_output = false) { return $raw_output ? array_keys($this->supported_ciphers) : array_values($this->supported_ciphers); } /** * Return a list of authentications supported by SSH1 server. * * Just because a cipher is supported by an SSH1 server doesn't mean it's supported by this library. If $raw_output * is set to true, returns, instead, an array of constants. ie. instead of array('password authentication'), you'll * get array(self::AUTH_PASSWORD). * * @param bool $raw_output * @return array * @access public */ function getSupportedAuthentications($raw_output = false) { return $raw_output ? array_keys($this->supported_authentications) : array_values($this->supported_authentications); } /** * Return the server identification. * * @return string * @access public */ function getServerIdentification() { return rtrim($this->server_identification); } /** * Logs data packets * * Makes sure that only the last 1MB worth of packets will be logged * * @param string $data * @access private */ function _append_log($protocol_flags, $message) { switch (NET_SSH1_LOGGING) { // useful for benchmarks case self::LOG_SIMPLE: $this->protocol_flags_log[] = $protocol_flags; break; // the most useful log for SSH1 case self::LOG_COMPLEX: $this->protocol_flags_log[] = $protocol_flags; $this->_string_shift($message); $this->log_size+= strlen($message); $this->message_log[] = $message; while ($this->log_size > self::LOG_MAX_SIZE) { $this->log_size-= strlen(array_shift($this->message_log)); array_shift($this->protocol_flags_log); } break; // dump the output out realtime; packets may be interspersed with non packets, // passwords won't be filtered out and select other packets may not be correctly // identified case self::LOG_REALTIME: echo "
\r\n" . $this->_format_log(array($message), array($protocol_flags)) . "\r\n
\r\n"; @flush(); @ob_flush(); break; // basically the same thing as self::LOG_REALTIME with the caveat that self::LOG_REALTIME_FILE // needs to be defined and that the resultant log file will be capped out at self::LOG_MAX_SIZE. // the earliest part of the log file is denoted by the first <<< START >>> and is not going to necessarily // at the beginning of the file case self::LOG_REALTIME_FILE: if (!isset($this->realtime_log_file)) { // PHP doesn't seem to like using constants in fopen() $filename = self::LOG_REALTIME_FILE; $fp = fopen($filename, 'w'); $this->realtime_log_file = $fp; } if (!is_resource($this->realtime_log_file)) { break; } $entry = $this->_format_log(array($message), array($protocol_flags)); if ($this->realtime_log_wrap) { $temp = "<<< START >>>\r\n"; $entry.= $temp; fseek($this->realtime_log_file, ftell($this->realtime_log_file) - strlen($temp)); } $this->realtime_log_size+= strlen($entry); if ($this->realtime_log_size > self::LOG_MAX_SIZE) { fseek($this->realtime_log_file, 0); $this->realtime_log_size = strlen($entry); $this->realtime_log_wrap = true; } fputs($this->realtime_log_file, $entry); } } }