From 6e08f398200de8a1560e14cdb4fb6c278a8e2b94 Mon Sep 17 00:00:00 2001 From: friendica Date: Sat, 21 Jul 2012 03:48:59 -0700 Subject: simplify --- library/phpsec/Net/SSH2.php | 2302 ------------------------------------------- 1 file changed, 2302 deletions(-) delete mode 100644 library/phpsec/Net/SSH2.php (limited to 'library/phpsec/Net/SSH2.php') diff --git a/library/phpsec/Net/SSH2.php b/library/phpsec/Net/SSH2.php deleted file mode 100644 index aa9f6dbe5..000000000 --- a/library/phpsec/Net/SSH2.php +++ /dev/null @@ -1,2302 +0,0 @@ - - * login('username', 'password')) { - * exit('Login Failed'); - * } - * - * echo $ssh->exec('pwd'); - * echo $ssh->exec('ls -la'); - * ?> - * - * - * - * setPassword('whatever'); - * $key->loadKey(file_get_contents('privatekey')); - * - * $ssh = new Net_SSH2('www.domain.tld'); - * if (!$ssh->login('username', $key)) { - * exit('Login Failed'); - * } - * - * echo $ssh->exec('pwd'); - * echo $ssh->exec('ls -la'); - * ?> - * - * - * LICENSE: This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA - * - * @category Net - * @package Net_SSH2 - * @author Jim Wigginton - * @copyright MMVII Jim Wigginton - * @license http://www.gnu.org/licenses/lgpl.txt - * @version $Id: SSH2.php,v 1.46 2010/04/27 21:29:36 terrafrost Exp $ - * @link http://phpseclib.sourceforge.net - */ - -/** - * Include Math_BigInteger - * - * Used to do Diffie-Hellman key exchange and DSA/RSA signature verification. - */ -require_once('Math/BigInteger.php'); - -/** - * Include Crypt_Random - */ -require_once('Crypt/Random.php'); - -/** - * Include Crypt_Hash - */ -require_once('Crypt/Hash.php'); - -/** - * Include Crypt_TripleDES - */ -require_once('Crypt/TripleDES.php'); - -/** - * Include Crypt_RC4 - */ -require_once('Crypt/RC4.php'); - -/** - * Include Crypt_AES - */ -require_once('Crypt/AES.php'); - -/**#@+ - * Execution Bitmap Masks - * - * @see Net_SSH2::bitmap - * @access private - */ -define('NET_SSH2_MASK_CONSTRUCTOR', 0x00000001); -define('NET_SSH2_MASK_LOGIN', 0x00000002); -/**#@-*/ - -/**#@+ - * Channel constants - * - * RFC4254 refers not to client and server channels but rather to sender and recipient channels. we don't refer - * to them in that way because RFC4254 toggles the meaning. the client sends a SSH_MSG_CHANNEL_OPEN message with - * a sender channel and the server sends a SSH_MSG_CHANNEL_OPEN_CONFIRMATION in response, with a sender and a - * recepient channel. at first glance, you might conclude that SSH_MSG_CHANNEL_OPEN_CONFIRMATION's sender channel - * would be the same thing as SSH_MSG_CHANNEL_OPEN's sender channel, but it's not, per this snipet: - * The 'recipient channel' is the channel number given in the original - * open request, and 'sender channel' is the channel number allocated by - * the other side. - * - * @see Net_SSH2::_send_channel_packet() - * @see Net_SSH2::_get_channel_packet() - * @access private - */ -define('NET_SSH2_CHANNEL_EXEC', 0); // PuTTy uses 0x100 -/**#@-*/ - -/**#@+ - * @access public - * @see Net_SSH2::getLog() - */ -/** - * Returns the message numbers - */ -define('NET_SSH2_LOG_SIMPLE', 1); -/** - * Returns the message content - */ -define('NET_SSH2_LOG_COMPLEX', 2); -/**#@-*/ - -/** - * Pure-PHP implementation of SSHv2. - * - * @author Jim Wigginton - * @version 0.1.0 - * @access public - * @package Net_SSH2 - */ -class Net_SSH2 { - /** - * The SSH identifier - * - * @var String - * @access private - */ - var $identifier = 'SSH-2.0-phpseclib_0.2'; - - /** - * The Socket Object - * - * @var Object - * @access private - */ - var $fsock; - - /** - * Execution Bitmap - * - * The bits that are set reprsent 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 Integer - * @access private - */ - var $bitmap = 0; - - /** - * Error information - * - * @see Net_SSH2::getErrors() - * @see Net_SSH2::getLastError() - * @var String - * @access private - */ - var $errors = array(); - - /** - * Server Identifier - * - * @see Net_SSH2::getServerIdentification() - * @var String - * @access private - */ - var $server_identifier = ''; - - /** - * Key Exchange Algorithms - * - * @see Net_SSH2::getKexAlgorithims() - * @var Array - * @access private - */ - var $kex_algorithms; - - /** - * Server Host Key Algorithms - * - * @see Net_SSH2::getServerHostKeyAlgorithms() - * @var Array - * @access private - */ - var $server_host_key_algorithms; - - /** - * Encryption Algorithms: Client to Server - * - * @see Net_SSH2::getEncryptionAlgorithmsClient2Server() - * @var Array - * @access private - */ - var $encryption_algorithms_client_to_server; - - /** - * Encryption Algorithms: Server to Client - * - * @see Net_SSH2::getEncryptionAlgorithmsServer2Client() - * @var Array - * @access private - */ - var $encryption_algorithms_server_to_client; - - /** - * MAC Algorithms: Client to Server - * - * @see Net_SSH2::getMACAlgorithmsClient2Server() - * @var Array - * @access private - */ - var $mac_algorithms_client_to_server; - - /** - * MAC Algorithms: Server to Client - * - * @see Net_SSH2::getMACAlgorithmsServer2Client() - * @var Array - * @access private - */ - var $mac_algorithms_server_to_client; - - /** - * Compression Algorithms: Client to Server - * - * @see Net_SSH2::getCompressionAlgorithmsClient2Server() - * @var Array - * @access private - */ - var $compression_algorithms_client_to_server; - - /** - * Compression Algorithms: Server to Client - * - * @see Net_SSH2::getCompressionAlgorithmsServer2Client() - * @var Array - * @access private - */ - var $compression_algorithms_server_to_client; - - /** - * Languages: Server to Client - * - * @see Net_SSH2::getLanguagesServer2Client() - * @var Array - * @access private - */ - var $languages_server_to_client; - - /** - * Languages: Client to Server - * - * @see Net_SSH2::getLanguagesClient2Server() - * @var Array - * @access private - */ - var $languages_client_to_server; - - /** - * Block Size for Server to Client Encryption - * - * "Note that the length of the concatenation of 'packet_length', - * 'padding_length', 'payload', and 'random padding' MUST be a multiple - * of the cipher block size or 8, whichever is larger. This constraint - * MUST be enforced, even when using stream ciphers." - * - * -- http://tools.ietf.org/html/rfc4253#section-6 - * - * @see Net_SSH2::Net_SSH2() - * @see Net_SSH2::_send_binary_packet() - * @var Integer - * @access private - */ - var $encrypt_block_size = 8; - - /** - * Block Size for Client to Server Encryption - * - * @see Net_SSH2::Net_SSH2() - * @see Net_SSH2::_get_binary_packet() - * @var Integer - * @access private - */ - var $decrypt_block_size = 8; - - /** - * Server to Client Encryption Object - * - * @see Net_SSH2::_get_binary_packet() - * @var Object - * @access private - */ - var $decrypt = false; - - /** - * Client to Server Encryption Object - * - * @see Net_SSH2::_send_binary_packet() - * @var Object - * @access private - */ - var $encrypt = false; - - /** - * Client to Server HMAC Object - * - * @see Net_SSH2::_send_binary_packet() - * @var Object - * @access private - */ - var $hmac_create = false; - - /** - * Server to Client HMAC Object - * - * @see Net_SSH2::_get_binary_packet() - * @var Object - * @access private - */ - var $hmac_check = false; - - /** - * Size of server to client HMAC - * - * We need to know how big the HMAC will be for the server to client direction so that we know how many bytes to read. - * For the client to server side, the HMAC object will make the HMAC as long as it needs to be. All we need to do is - * append it. - * - * @see Net_SSH2::_get_binary_packet() - * @var Integer - * @access private - */ - var $hmac_size = false; - - /** - * Server Public Host Key - * - * @see Net_SSH2::getServerPublicHostKey() - * @var String - * @access private - */ - var $server_public_host_key; - - /** - * Session identifer - * - * "The exchange hash H from the first key exchange is additionally - * used as the session identifier, which is a unique identifier for - * this connection." - * - * -- http://tools.ietf.org/html/rfc4253#section-7.2 - * - * @see Net_SSH2::_key_exchange() - * @var String - * @access private - */ - var $session_id = false; - - /** - * Message Numbers - * - * @see Net_SSH2::Net_SSH2() - * @var Array - * @access private - */ - var $message_numbers = array(); - - /** - * Disconnection Message 'reason codes' defined in RFC4253 - * - * @see Net_SSH2::Net_SSH2() - * @var Array - * @access private - */ - var $disconnect_reasons = array(); - - /** - * SSH_MSG_CHANNEL_OPEN_FAILURE 'reason codes', defined in RFC4254 - * - * @see Net_SSH2::Net_SSH2() - * @var Array - * @access private - */ - var $channel_open_failure_reasons = array(); - - /** - * Terminal Modes - * - * @link http://tools.ietf.org/html/rfc4254#section-8 - * @see Net_SSH2::Net_SSH2() - * @var Array - * @access private - */ - var $terminal_modes = array(); - - /** - * SSH_MSG_CHANNEL_EXTENDED_DATA's data_type_codes - * - * @link http://tools.ietf.org/html/rfc4254#section-5.2 - * @see Net_SSH2::Net_SSH2() - * @var Array - * @access private - */ - var $channel_extended_data_type_codes = array(); - - /** - * Send Sequence Number - * - * See 'Section 6.4. Data Integrity' of rfc4253 for more info. - * - * @see Net_SSH2::_send_binary_packet() - * @var Integer - * @access private - */ - var $send_seq_no = 0; - - /** - * Get Sequence Number - * - * See 'Section 6.4. Data Integrity' of rfc4253 for more info. - * - * @see Net_SSH2::_get_binary_packet() - * @var Integer - * @access private - */ - var $get_seq_no = 0; - - /** - * Server Channels - * - * Maps client channels to server channels - * - * @see Net_SSH2::_get_channel_packet() - * @see Net_SSH2::exec() - * @var Array - * @access private - */ - var $server_channels = array(); - - /** - * Channel Buffers - * - * If a client requests a packet from one channel but receives two packets from another those packets should - * be placed in a buffer - * - * @see Net_SSH2::_get_channel_packet() - * @see Net_SSH2::exec() - * @var Array - * @access private - */ - var $channel_buffers = array(); - - /** - * Channel Status - * - * Contains the type of the last sent message - * - * @see Net_SSH2::_get_channel_packet() - * @var Array - * @access private - */ - var $channel_status = array(); - - /** - * Packet Size - * - * Maximum packet size indexed by channel - * - * @see Net_SSH2::_send_channel_packet() - * @var Array - * @access private - */ - var $packet_size_client_to_server = array(); - - /** - * Message Number Log - * - * @see Net_SSH2::getLog() - * @var Array - * @access private - */ - var $message_number_log = array(); - - /** - * Message Log - * - * @see Net_SSH2::getLog() - * @var Array - * @access private - */ - var $message_log = array(); - - /** - * The Window Size - * - * Bytes the other party can send before it must wait for the window to be adjusted (0x7FFFFFFF = 4GB) - * - * @var Integer - * @see Net_SSH2::_send_channel_packet() - * @see Net_SSH2::exec() - * @access private - */ - var $window_size = 0x7FFFFFFF; - - /** - * Window size - * - * Window size indexed by channel - * - * @see Net_SSH2::_send_channel_packet() - * @var Array - * @access private - */ - var $window_size_client_to_server = array(); - - /** - * Server signature - * - * Verified against $this->session_id - * - * @see Net_SSH2::getServerPublicHostKey() - * @var String - * @access private - */ - var $signature = ''; - - /** - * Server signature format - * - * ssh-rsa or ssh-dss. - * - * @see Net_SSH2::getServerPublicHostKey() - * @var String - * @access private - */ - var $signature_format = ''; - - /** - * Default Constructor. - * - * Connects to an SSHv2 server - * - * @param String $host - * @param optional Integer $port - * @param optional Integer $timeout - * @return Net_SSH2 - * @access public - */ - function Net_SSH2($host, $port = 22, $timeout = 10) - { - $this->message_numbers = array( - 1 => 'NET_SSH2_MSG_DISCONNECT', - 2 => 'NET_SSH2_MSG_IGNORE', - 3 => 'NET_SSH2_MSG_UNIMPLEMENTED', - 4 => 'NET_SSH2_MSG_DEBUG', - 5 => 'NET_SSH2_MSG_SERVICE_REQUEST', - 6 => 'NET_SSH2_MSG_SERVICE_ACCEPT', - 20 => 'NET_SSH2_MSG_KEXINIT', - 21 => 'NET_SSH2_MSG_NEWKEYS', - 30 => 'NET_SSH2_MSG_KEXDH_INIT', - 31 => 'NET_SSH2_MSG_KEXDH_REPLY', - 50 => 'NET_SSH2_MSG_USERAUTH_REQUEST', - 51 => 'NET_SSH2_MSG_USERAUTH_FAILURE', - 52 => 'NET_SSH2_MSG_USERAUTH_SUCCESS', - 53 => 'NET_SSH2_MSG_USERAUTH_BANNER', - - 80 => 'NET_SSH2_MSG_GLOBAL_REQUEST', - 81 => 'NET_SSH2_MSG_REQUEST_SUCCESS', - 82 => 'NET_SSH2_MSG_REQUEST_FAILURE', - 90 => 'NET_SSH2_MSG_CHANNEL_OPEN', - 91 => 'NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION', - 92 => 'NET_SSH2_MSG_CHANNEL_OPEN_FAILURE', - 93 => 'NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST', - 94 => 'NET_SSH2_MSG_CHANNEL_DATA', - 95 => 'NET_SSH2_MSG_CHANNEL_EXTENDED_DATA', - 96 => 'NET_SSH2_MSG_CHANNEL_EOF', - 97 => 'NET_SSH2_MSG_CHANNEL_CLOSE', - 98 => 'NET_SSH2_MSG_CHANNEL_REQUEST', - 99 => 'NET_SSH2_MSG_CHANNEL_SUCCESS', - 100 => 'NET_SSH2_MSG_CHANNEL_FAILURE' - ); - $this->disconnect_reasons = array( - 1 => 'NET_SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT', - 2 => 'NET_SSH2_DISCONNECT_PROTOCOL_ERROR', - 3 => 'NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED', - 4 => 'NET_SSH2_DISCONNECT_RESERVED', - 5 => 'NET_SSH2_DISCONNECT_MAC_ERROR', - 6 => 'NET_SSH2_DISCONNECT_COMPRESSION_ERROR', - 7 => 'NET_SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE', - 8 => 'NET_SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED', - 9 => 'NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE', - 10 => 'NET_SSH2_DISCONNECT_CONNECTION_LOST', - 11 => 'NET_SSH2_DISCONNECT_BY_APPLICATION', - 12 => 'NET_SSH2_DISCONNECT_TOO_MANY_CONNECTIONS', - 13 => 'NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER', - 14 => 'NET_SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE', - 15 => 'NET_SSH2_DISCONNECT_ILLEGAL_USER_NAME' - ); - $this->channel_open_failure_reasons = array( - 1 => 'NET_SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED' - ); - $this->terminal_modes = array( - 0 => 'NET_SSH2_TTY_OP_END' - ); - $this->channel_extended_data_type_codes = array( - 1 => 'NET_SSH2_EXTENDED_DATA_STDERR' - ); - - $this->_define_array( - $this->message_numbers, - $this->disconnect_reasons, - $this->channel_open_failure_reasons, - $this->terminal_modes, - $this->channel_extended_data_type_codes, - array(60 => 'NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ'), - array(60 => 'NET_SSH2_MSG_USERAUTH_PK_OK') - ); - - $this->fsock = @fsockopen($host, $port, $errno, $errstr, $timeout); - if (!$this->fsock) { - user_error(rtrim("Cannot connect to $host. Error $errno. $errstr"), E_USER_NOTICE); - return; - } - - /* According to the SSH2 specs, - - "The server MAY send other lines of data before sending the version - string. Each line SHOULD be terminated by a Carriage Return and Line - Feed. Such lines MUST NOT begin with "SSH-", and SHOULD be encoded - in ISO-10646 UTF-8 [RFC3629] (language is not specified). Clients - MUST be able to process such lines." */ - $temp = ''; - $extra = ''; - while (!feof($this->fsock) && !preg_match('#^SSH-(\d\.\d+)#', $temp, $matches)) { - if (substr($temp, -2) == "\r\n") { - $extra.= $temp; - $temp = ''; - } - $temp.= fgets($this->fsock, 255); - } - - $ext = array(); - if (extension_loaded('mcrypt')) { - $ext[] = 'mcrypt'; - } - if (extension_loaded('gmp')) { - $ext[] = 'gmp'; - } else if (extension_loaded('bcmath')) { - $ext[] = 'bcmath'; - } - - if (!empty($ext)) { - $this->identifier.= ' (' . implode(', ', $ext) . ')'; - } - - if (defined('NET_SSH2_LOGGING')) { - $this->message_number_log[] = '<-'; - $this->message_number_log[] = '->'; - - if (NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) { - $this->message_log[] = $temp; - $this->message_log[] = $this->identifier . "\r\n"; - } - } - - $this->server_identifier = trim($temp, "\r\n"); - if (!empty($extra)) { - $this->errors[] = utf8_decode($extra); - } - - if ($matches[1] != '1.99' && $matches[1] != '2.0') { - user_error("Cannot connect to SSH $matches[1] servers", E_USER_NOTICE); - return; - } - - fputs($this->fsock, $this->identifier . "\r\n"); - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server', E_USER_NOTICE); - return; - } - - if (ord($response[0]) != NET_SSH2_MSG_KEXINIT) { - user_error('Expected SSH_MSG_KEXINIT', E_USER_NOTICE); - return; - } - - if (!$this->_key_exchange($response)) { - return; - } - - $this->bitmap = NET_SSH2_MASK_CONSTRUCTOR; - } - - /** - * Key Exchange - * - * @param String $kexinit_payload_server - * @access private - */ - function _key_exchange($kexinit_payload_server) - { - static $kex_algorithms = array( - 'diffie-hellman-group1-sha1', // REQUIRED - 'diffie-hellman-group14-sha1' // REQUIRED - ); - - static $server_host_key_algorithms = array( - 'ssh-rsa', // RECOMMENDED sign Raw RSA Key - 'ssh-dss' // REQUIRED sign Raw DSS Key - ); - - static $encryption_algorithms = array( - // from : - 'arcfour256', - 'arcfour128', - - 'arcfour', // OPTIONAL the ARCFOUR stream cipher with a 128-bit key - - 'aes128-cbc', // RECOMMENDED AES with a 128-bit key - 'aes192-cbc', // OPTIONAL AES with a 192-bit key - 'aes256-cbc', // OPTIONAL AES in CBC mode, with a 256-bit key - - // from : - 'aes128-ctr', // RECOMMENDED AES (Rijndael) in SDCTR mode, with 128-bit key - 'aes192-ctr', // RECOMMENDED AES with 192-bit key - 'aes256-ctr', // RECOMMENDED AES with 256-bit key - '3des-ctr', // RECOMMENDED Three-key 3DES in SDCTR mode - - '3des-cbc', // REQUIRED three-key 3DES in CBC mode - 'none' // OPTIONAL no encryption; NOT RECOMMENDED - ); - - static $mac_algorithms = array( - 'hmac-sha1-96', // RECOMMENDED first 96 bits of HMAC-SHA1 (digest length = 12, key length = 20) - 'hmac-sha1', // REQUIRED HMAC-SHA1 (digest length = key length = 20) - 'hmac-md5-96', // OPTIONAL first 96 bits of HMAC-MD5 (digest length = 12, key length = 16) - 'hmac-md5', // OPTIONAL HMAC-MD5 (digest length = key length = 16) - 'none' // OPTIONAL no MAC; NOT RECOMMENDED - ); - - static $compression_algorithms = array( - 'none' // REQUIRED no compression - //'zlib' // OPTIONAL ZLIB (LZ77) compression - ); - - static $str_kex_algorithms, $str_server_host_key_algorithms, - $encryption_algorithms_server_to_client, $mac_algorithms_server_to_client, $compression_algorithms_server_to_client, - $encryption_algorithms_client_to_server, $mac_algorithms_client_to_server, $compression_algorithms_client_to_server; - - if (empty($str_kex_algorithms)) { - $str_kex_algorithms = implode(',', $kex_algorithms); - $str_server_host_key_algorithms = implode(',', $server_host_key_algorithms); - $encryption_algorithms_server_to_client = $encryption_algorithms_client_to_server = implode(',', $encryption_algorithms); - $mac_algorithms_server_to_client = $mac_algorithms_client_to_server = implode(',', $mac_algorithms); - $compression_algorithms_server_to_client = $compression_algorithms_client_to_server = implode(',', $compression_algorithms); - } - - $client_cookie = ''; - for ($i = 0; $i < 16; $i++) { - $client_cookie.= chr(crypt_random(0, 255)); - } - - $response = $kexinit_payload_server; - $this->_string_shift($response, 1); // skip past the message number (it should be SSH_MSG_KEXINIT) - $server_cookie = $this->_string_shift($response, 16); - - $temp = unpack('Nlength', $this->_string_shift($response, 4)); - $this->kex_algorithms = explode(',', $this->_string_shift($response, $temp['length'])); - - $temp = unpack('Nlength', $this->_string_shift($response, 4)); - $this->server_host_key_algorithms = explode(',', $this->_string_shift($response, $temp['length'])); - - $temp = unpack('Nlength', $this->_string_shift($response, 4)); - $this->encryption_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length'])); - - $temp = unpack('Nlength', $this->_string_shift($response, 4)); - $this->encryption_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length'])); - - $temp = unpack('Nlength', $this->_string_shift($response, 4)); - $this->mac_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length'])); - - $temp = unpack('Nlength', $this->_string_shift($response, 4)); - $this->mac_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length'])); - - $temp = unpack('Nlength', $this->_string_shift($response, 4)); - $this->compression_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length'])); - - $temp = unpack('Nlength', $this->_string_shift($response, 4)); - $this->compression_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length'])); - - $temp = unpack('Nlength', $this->_string_shift($response, 4)); - $this->languages_client_to_server = explode(',', $this->_string_shift($response, $temp['length'])); - - $temp = unpack('Nlength', $this->_string_shift($response, 4)); - $this->languages_server_to_client = explode(',', $this->_string_shift($response, $temp['length'])); - - extract(unpack('Cfirst_kex_packet_follows', $this->_string_shift($response, 1))); - $first_kex_packet_follows = $first_kex_packet_follows != 0; - - // the sending of SSH2_MSG_KEXINIT could go in one of two places. this is the second place. - $kexinit_payload_client = pack('Ca*Na*Na*Na*Na*Na*Na*Na*Na*Na*Na*CN', - NET_SSH2_MSG_KEXINIT, $client_cookie, strlen($str_kex_algorithms), $str_kex_algorithms, - strlen($str_server_host_key_algorithms), $str_server_host_key_algorithms, strlen($encryption_algorithms_client_to_server), - $encryption_algorithms_client_to_server, strlen($encryption_algorithms_server_to_client), $encryption_algorithms_server_to_client, - strlen($mac_algorithms_client_to_server), $mac_algorithms_client_to_server, strlen($mac_algorithms_server_to_client), - $mac_algorithms_server_to_client, strlen($compression_algorithms_client_to_server), $compression_algorithms_client_to_server, - strlen($compression_algorithms_server_to_client), $compression_algorithms_server_to_client, 0, '', 0, '', - 0, 0 - ); - - if (!$this->_send_binary_packet($kexinit_payload_client)) { - return false; - } - // here ends the second place. - - // we need to decide upon the symmetric encryption algorithms before we do the diffie-hellman key exchange - for ($i = 0; $i < count($encryption_algorithms) && !in_array($encryption_algorithms[$i], $this->encryption_algorithms_server_to_client); $i++); - if ($i == count($encryption_algorithms)) { - user_error('No compatible server to client encryption algorithms found', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - // we don't initialize any crypto-objects, yet - we do that, later. for now, we need the lengths to make the - // diffie-hellman key exchange as fast as possible - $decrypt = $encryption_algorithms[$i]; - switch ($decrypt) { - case '3des-cbc': - case '3des-ctr': - $decryptKeyLength = 24; // eg. 192 / 8 - break; - case 'aes256-cbc': - case 'aes256-ctr': - $decryptKeyLength = 32; // eg. 256 / 8 - break; - case 'aes192-cbc': - case 'aes192-ctr': - $decryptKeyLength = 24; // eg. 192 / 8 - break; - case 'aes128-cbc': - case 'aes128-ctr': - $decryptKeyLength = 16; // eg. 128 / 8 - break; - case 'arcfour': - case 'arcfour128': - $decryptKeyLength = 16; // eg. 128 / 8 - break; - case 'arcfour256': - $decryptKeyLength = 32; // eg. 128 / 8 - break; - case 'none'; - $decryptKeyLength = 0; - } - - for ($i = 0; $i < count($encryption_algorithms) && !in_array($encryption_algorithms[$i], $this->encryption_algorithms_client_to_server); $i++); - if ($i == count($encryption_algorithms)) { - user_error('No compatible client to server encryption algorithms found', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - $encrypt = $encryption_algorithms[$i]; - switch ($encrypt) { - case '3des-cbc': - case '3des-ctr': - $encryptKeyLength = 24; - break; - case 'aes256-cbc': - case 'aes256-ctr': - $encryptKeyLength = 32; - break; - case 'aes192-cbc': - case 'aes192-ctr': - $encryptKeyLength = 24; - break; - case 'aes128-cbc': - case 'aes128-ctr': - $encryptKeyLength = 16; - break; - case 'arcfour': - case 'arcfour128': - $encryptKeyLength = 16; - break; - case 'arcfour256': - $encryptKeyLength = 32; - break; - case 'none'; - $encryptKeyLength = 0; - } - - $keyLength = $decryptKeyLength > $encryptKeyLength ? $decryptKeyLength : $encryptKeyLength; - - // through diffie-hellman key exchange a symmetric key is obtained - for ($i = 0; $i < count($kex_algorithms) && !in_array($kex_algorithms[$i], $this->kex_algorithms); $i++); - if ($i == count($kex_algorithms)) { - user_error('No compatible key exchange algorithms found', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - switch ($kex_algorithms[$i]) { - // see http://tools.ietf.org/html/rfc2409#section-6.2 and - // http://tools.ietf.org/html/rfc2412, appendex E - case 'diffie-hellman-group1-sha1': - $p = pack('H256', 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' . - '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' . - '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' . - 'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF'); - $keyLength = $keyLength < 160 ? $keyLength : 160; - $hash = 'sha1'; - break; - // see http://tools.ietf.org/html/rfc3526#section-3 - case 'diffie-hellman-group14-sha1': - $p = pack('H512', 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' . - '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' . - '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' . - 'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' . - '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' . - '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' . - 'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' . - '3995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF'); - $keyLength = $keyLength < 160 ? $keyLength : 160; - $hash = 'sha1'; - } - - $p = new Math_BigInteger($p, 256); - //$q = $p->bitwise_rightShift(1); - - /* To increase the speed of the key exchange, both client and server may - reduce the size of their private exponents. It should be at least - twice as long as the key material that is generated from the shared - secret. For more details, see the paper by van Oorschot and Wiener - [VAN-OORSCHOT]. - - -- http://tools.ietf.org/html/rfc4419#section-6.2 */ - $q = new Math_BigInteger(1); - $q = $q->bitwise_leftShift(2 * $keyLength); - $q = $q->subtract(new Math_BigInteger(1)); - - $g = new Math_BigInteger(2); - $x = new Math_BigInteger(); - $x->setRandomGenerator('crypt_random'); - $x = $x->random(new Math_BigInteger(1), $q); - $e = $g->modPow($x, $p); - - $eBytes = $e->toBytes(true); - $data = pack('CNa*', NET_SSH2_MSG_KEXDH_INIT, strlen($eBytes), $eBytes); - - if (!$this->_send_binary_packet($data)) { - user_error('Connection closed by server', E_USER_NOTICE); - return false; - } - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server', E_USER_NOTICE); - return false; - } - extract(unpack('Ctype', $this->_string_shift($response, 1))); - - if ($type != NET_SSH2_MSG_KEXDH_REPLY) { - user_error('Expected SSH_MSG_KEXDH_REPLY', E_USER_NOTICE); - return false; - } - - $temp = unpack('Nlength', $this->_string_shift($response, 4)); - $this->server_public_host_key = $server_public_host_key = $this->_string_shift($response, $temp['length']); - - $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4)); - $public_key_format = $this->_string_shift($server_public_host_key, $temp['length']); - - $temp = unpack('Nlength', $this->_string_shift($response, 4)); - $fBytes = $this->_string_shift($response, $temp['length']); - $f = new Math_BigInteger($fBytes, -256); - - $temp = unpack('Nlength', $this->_string_shift($response, 4)); - $this->signature = $this->_string_shift($response, $temp['length']); - - $temp = unpack('Nlength', $this->_string_shift($this->signature, 4)); - $this->signature_format = $this->_string_shift($this->signature, $temp['length']); - - $key = $f->modPow($x, $p); - $keyBytes = $key->toBytes(true); - - if ($this->session_id === false) { - $source = pack('Na*Na*Na*Na*Na*Na*Na*Na*', - strlen($this->identifier), $this->identifier, strlen($this->server_identifier), $this->server_identifier, - strlen($kexinit_payload_client), $kexinit_payload_client, strlen($kexinit_payload_server), - $kexinit_payload_server, strlen($this->server_public_host_key), $this->server_public_host_key, strlen($eBytes), - $eBytes, strlen($fBytes), $fBytes, strlen($keyBytes), $keyBytes - ); - - $source = pack('H*', $hash($source)); - - $this->session_id = $source; - } - - for ($i = 0; $i < count($server_host_key_algorithms) && !in_array($server_host_key_algorithms[$i], $this->server_host_key_algorithms); $i++); - if ($i == count($server_host_key_algorithms)) { - user_error('No compatible server host key algorithms found', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - if ($public_key_format != $server_host_key_algorithms[$i] || $this->signature_format != $server_host_key_algorithms[$i]) { - user_error('Sever Host Key Algorithm Mismatch', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - $packet = pack('C', - NET_SSH2_MSG_NEWKEYS - ); - - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $response = $this->_get_binary_packet(); - - if ($response === false) { - user_error('Connection closed by server', E_USER_NOTICE); - return false; - } - - extract(unpack('Ctype', $this->_string_shift($response, 1))); - - if ($type != NET_SSH2_MSG_NEWKEYS) { - user_error('Expected SSH_MSG_NEWKEYS', E_USER_NOTICE); - return false; - } - - switch ($encrypt) { - case '3des-cbc': - $this->encrypt = new Crypt_TripleDES(); - // $this->encrypt_block_size = 64 / 8 == the default - break; - case '3des-ctr': - $this->encrypt = new Crypt_TripleDES(CRYPT_DES_MODE_CTR); - // $this->encrypt_block_size = 64 / 8 == the default - break; - case 'aes256-cbc': - case 'aes192-cbc': - case 'aes128-cbc': - $this->encrypt = new Crypt_AES(); - $this->encrypt_block_size = 16; // eg. 128 / 8 - break; - case 'aes256-ctr': - case 'aes192-ctr': - case 'aes128-ctr': - $this->encrypt = new Crypt_AES(CRYPT_AES_MODE_CTR); - $this->encrypt_block_size = 16; // eg. 128 / 8 - break; - case 'arcfour': - case 'arcfour128': - case 'arcfour256': - $this->encrypt = new Crypt_RC4(); - break; - case 'none'; - //$this->encrypt = new Crypt_Null(); - } - - switch ($decrypt) { - case '3des-cbc': - $this->decrypt = new Crypt_TripleDES(); - break; - case '3des-ctr': - $this->decrypt = new Crypt_TripleDES(CRYPT_DES_MODE_CTR); - break; - case 'aes256-cbc': - case 'aes192-cbc': - case 'aes128-cbc': - $this->decrypt = new Crypt_AES(); - $this->decrypt_block_size = 16; - break; - case 'aes256-ctr': - case 'aes192-ctr': - case 'aes128-ctr': - $this->decrypt = new Crypt_AES(CRYPT_AES_MODE_CTR); - $this->decrypt_block_size = 16; - break; - case 'arcfour': - case 'arcfour128': - case 'arcfour256': - $this->decrypt = new Crypt_RC4(); - break; - case 'none'; - //$this->decrypt = new Crypt_Null(); - } - - $keyBytes = pack('Na*', strlen($keyBytes), $keyBytes); - - if ($this->encrypt) { - $this->encrypt->enableContinuousBuffer(); - $this->encrypt->disablePadding(); - - $iv = pack('H*', $hash($keyBytes . $this->session_id . 'A' . $this->session_id)); - while ($this->encrypt_block_size > strlen($iv)) { - $iv.= pack('H*', $hash($keyBytes . $this->session_id . $iv)); - } - $this->encrypt->setIV(substr($iv, 0, $this->encrypt_block_size)); - - $key = pack('H*', $hash($keyBytes . $this->session_id . 'C' . $this->session_id)); - while ($encryptKeyLength > strlen($key)) { - $key.= pack('H*', $hash($keyBytes . $this->session_id . $key)); - } - $this->encrypt->setKey(substr($key, 0, $encryptKeyLength)); - } - - if ($this->decrypt) { - $this->decrypt->enableContinuousBuffer(); - $this->decrypt->disablePadding(); - - $iv = pack('H*', $hash($keyBytes . $this->session_id . 'B' . $this->session_id)); - while ($this->decrypt_block_size > strlen($iv)) { - $iv.= pack('H*', $hash($keyBytes . $this->session_id . $iv)); - } - $this->decrypt->setIV(substr($iv, 0, $this->decrypt_block_size)); - - $key = pack('H*', $hash($keyBytes . $this->session_id . 'D' . $this->session_id)); - while ($decryptKeyLength > strlen($key)) { - $key.= pack('H*', $hash($keyBytes . $this->session_id . $key)); - } - $this->decrypt->setKey(substr($key, 0, $decryptKeyLength)); - } - - /* The "arcfour128" algorithm is the RC4 cipher, as described in - [SCHNEIER], using a 128-bit key. The first 1536 bytes of keystream - generated by the cipher MUST be discarded, and the first byte of the - first encrypted packet MUST be encrypted using the 1537th byte of - keystream. - - -- http://tools.ietf.org/html/rfc4345#section-4 */ - if ($encrypt == 'arcfour128' || $encrypt == 'arcfour256') { - $this->encrypt->encrypt(str_repeat("\0", 1536)); - } - if ($decrypt == 'arcfour128' || $decrypt == 'arcfour256') { - $this->decrypt->decrypt(str_repeat("\0", 1536)); - } - - for ($i = 0; $i < count($mac_algorithms) && !in_array($mac_algorithms[$i], $this->mac_algorithms_client_to_server); $i++); - if ($i == count($mac_algorithms)) { - user_error('No compatible client to server message authentication algorithms found', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - $createKeyLength = 0; // ie. $mac_algorithms[$i] == 'none' - switch ($mac_algorithms[$i]) { - case 'hmac-sha1': - $this->hmac_create = new Crypt_Hash('sha1'); - $createKeyLength = 20; - break; - case 'hmac-sha1-96': - $this->hmac_create = new Crypt_Hash('sha1-96'); - $createKeyLength = 20; - break; - case 'hmac-md5': - $this->hmac_create = new Crypt_Hash('md5'); - $createKeyLength = 16; - break; - case 'hmac-md5-96': - $this->hmac_create = new Crypt_Hash('md5-96'); - $createKeyLength = 16; - } - - for ($i = 0; $i < count($mac_algorithms) && !in_array($mac_algorithms[$i], $this->mac_algorithms_server_to_client); $i++); - if ($i == count($mac_algorithms)) { - user_error('No compatible server to client message authentication algorithms found', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - $checkKeyLength = 0; - $this->hmac_size = 0; - switch ($mac_algorithms[$i]) { - case 'hmac-sha1': - $this->hmac_check = new Crypt_Hash('sha1'); - $checkKeyLength = 20; - $this->hmac_size = 20; - break; - case 'hmac-sha1-96': - $this->hmac_check = new Crypt_Hash('sha1-96'); - $checkKeyLength = 20; - $this->hmac_size = 12; - break; - case 'hmac-md5': - $this->hmac_check = new Crypt_Hash('md5'); - $checkKeyLength = 16; - $this->hmac_size = 16; - break; - case 'hmac-md5-96': - $this->hmac_check = new Crypt_Hash('md5-96'); - $checkKeyLength = 16; - $this->hmac_size = 12; - } - - $key = pack('H*', $hash($keyBytes . $this->session_id . 'E' . $this->session_id)); - while ($createKeyLength > strlen($key)) { - $key.= pack('H*', $hash($keyBytes . $this->session_id . $key)); - } - $this->hmac_create->setKey(substr($key, 0, $createKeyLength)); - - $key = pack('H*', $hash($keyBytes . $this->session_id . 'F' . $this->session_id)); - while ($checkKeyLength > strlen($key)) { - $key.= pack('H*', $hash($keyBytes . $this->session_id . $key)); - } - $this->hmac_check->setKey(substr($key, 0, $checkKeyLength)); - - for ($i = 0; $i < count($compression_algorithms) && !in_array($compression_algorithms[$i], $this->compression_algorithms_server_to_client); $i++); - if ($i == count($compression_algorithms)) { - user_error('No compatible server to client compression algorithms found', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - $this->decompress = $compression_algorithms[$i] == 'zlib'; - - for ($i = 0; $i < count($compression_algorithms) && !in_array($compression_algorithms[$i], $this->compression_algorithms_client_to_server); $i++); - if ($i == count($compression_algorithms)) { - user_error('No compatible client to server compression algorithms found', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - $this->compress = $compression_algorithms[$i] == 'zlib'; - - return true; - } - - /** - * Login - * - * @param String $username - * @param optional String $password - * @return Boolean - * @access public - * @internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis} - * by sending dummy SSH_MSG_IGNORE messages. - */ - function login($username, $password = '') - { - if (!($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR)) { - return false; - } - - $packet = pack('CNa*', - NET_SSH2_MSG_SERVICE_REQUEST, strlen('ssh-userauth'), 'ssh-userauth' - ); - - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server', E_USER_NOTICE); - return false; - } - - extract(unpack('Ctype', $this->_string_shift($response, 1))); - - if ($type != NET_SSH2_MSG_SERVICE_ACCEPT) { - user_error('Expected SSH_MSG_SERVICE_ACCEPT', E_USER_NOTICE); - return false; - } - - // although PHP5's get_class() preserves the case, PHP4's does not - if (is_object($password) && strtolower(get_class($password)) == 'crypt_rsa') { - return $this->_privatekey_login($username, $password); - } - - $utf8_password = utf8_encode($password); - $packet = pack('CNa*Na*Na*CNa*', - NET_SSH2_MSG_USERAUTH_REQUEST, strlen($username), $username, strlen('ssh-connection'), 'ssh-connection', - strlen('password'), 'password', 0, strlen($utf8_password), $utf8_password - ); - - if (!$this->_send_binary_packet($packet)) { - return false; - } - - // remove the username and password from the last logged packet - if (defined('NET_SSH2_LOGGING') && NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) { - $packet = pack('CNa*Na*Na*CNa*', - NET_SSH2_MSG_USERAUTH_REQUEST, strlen('username'), 'username', strlen('ssh-connection'), 'ssh-connection', - strlen('password'), 'password', 0, strlen('password'), 'password' - ); - $this->message_log[count($this->message_log) - 1] = $packet; - } - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server', E_USER_NOTICE); - return false; - } - - extract(unpack('Ctype', $this->_string_shift($response, 1))); - - switch ($type) { - case NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ: // in theory, the password can be changed - if (defined('NET_SSH2_LOGGING')) { - $this->message_number_log[count($this->message_number_log) - 1] = 'NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ'; - } - extract(unpack('Nlength', $this->_string_shift($response, 4))); - $this->errors[] = 'SSH_MSG_USERAUTH_PASSWD_CHANGEREQ: ' . utf8_decode($this->_string_shift($response, $length)); - return $this->_disconnect(NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER); - case NET_SSH2_MSG_USERAUTH_FAILURE: - // either the login is bad or the server employees multi-factor authentication - return false; - case NET_SSH2_MSG_USERAUTH_SUCCESS: - $this->bitmap |= NET_SSH2_MASK_LOGIN; - return true; - } - - return false; - } - - /** - * Login with an RSA private key - * - * @param String $username - * @param Crypt_RSA $password - * @return Boolean - * @access private - * @internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis} - * by sending dummy SSH_MSG_IGNORE messages. - */ - function _privatekey_login($username, $privatekey) - { - // see http://tools.ietf.org/html/rfc4253#page-15 - $publickey = $privatekey->getPublicKey(CRYPT_RSA_PUBLIC_FORMAT_RAW); - if ($publickey === false) { - return false; - } - - $publickey = array( - 'e' => $publickey['e']->toBytes(true), - 'n' => $publickey['n']->toBytes(true) - ); - $publickey = pack('Na*Na*Na*', - strlen('ssh-rsa'), 'ssh-rsa', strlen($publickey['e']), $publickey['e'], strlen($publickey['n']), $publickey['n'] - ); - - $part1 = pack('CNa*Na*Na*', - NET_SSH2_MSG_USERAUTH_REQUEST, strlen($username), $username, strlen('ssh-connection'), 'ssh-connection', - strlen('publickey'), 'publickey' - ); - $part2 = pack('Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($publickey), $publickey); - - $packet = $part1 . chr(0) . $part2; - - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server', E_USER_NOTICE); - return false; - } - - extract(unpack('Ctype', $this->_string_shift($response, 1))); - - switch ($type) { - case NET_SSH2_MSG_USERAUTH_FAILURE: - extract(unpack('Nlength', $this->_string_shift($response, 4))); - $this->errors[] = 'SSH_MSG_USERAUTH_FAILURE: ' . $this->_string_shift($response, $length); - return $this->_disconnect(NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER); - case NET_SSH2_MSG_USERAUTH_PK_OK: - // we'll just take it on faith that the public key blob and the public key algorithm name are as - // they should be - if (defined('NET_SSH2_LOGGING')) { - $this->message_number_log[count($this->message_number_log) - 1] = 'NET_SSH2_MSG_USERAUTH_PK_OK'; - } - } - - $packet = $part1 . chr(1) . $part2; - $privatekey->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1); - $signature = $privatekey->sign(pack('Na*a*', strlen($this->session_id), $this->session_id, $packet)); - $signature = pack('Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($signature), $signature); - $packet.= pack('Na*', strlen($signature), $signature); - - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server', E_USER_NOTICE); - return false; - } - - extract(unpack('Ctype', $this->_string_shift($response, 1))); - - switch ($type) { - case NET_SSH2_MSG_USERAUTH_FAILURE: - // either the login is bad or the server employees multi-factor authentication - return false; - case NET_SSH2_MSG_USERAUTH_SUCCESS: - $this->bitmap |= NET_SSH2_MASK_LOGIN; - return true; - } - - return false; - } - - /** - * Execute Command - * - * @param String $command - * @return String - * @access public - */ - function exec($command) - { - if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) { - return false; - } - - // RFC4254 defines the (client) window size as "bytes the other party can send before it must wait for the window to - // be adjusted". 0x7FFFFFFF is, at 4GB, the max size. technically, it should probably be decremented, but, - // honestly, if you're transfering more than 4GB, you probably shouldn't be using phpseclib, anyway. - // see http://tools.ietf.org/html/rfc4254#section-5.2 for more info - $this->window_size_client_to_server[NET_SSH2_CHANNEL_EXEC] = 0x7FFFFFFF; - // 0x8000 is the maximum max packet size, per http://tools.ietf.org/html/rfc4253#section-6.1, although since PuTTy - // uses 0x4000, that's what will be used here, as well. - $packet_size = 0x4000; - - $packet = pack('CNa*N3', - NET_SSH2_MSG_CHANNEL_OPEN, strlen('session'), 'session', NET_SSH2_CHANNEL_EXEC, $this->window_size_client_to_server[NET_SSH2_CHANNEL_EXEC], $packet_size); - - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_OPEN; - - $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_EXEC); - if ($response === false) { - return false; - } - - // sending a pty-req SSH_MSG_CHANNEL_REQUEST message is unnecessary and, in fact, in most cases, slows things - // down. the one place where it might be desirable is if you're doing something like Net_SSH2::exec('ping localhost &'). - // with a pty-req SSH_MSG_cHANNEL_REQUEST, exec() will return immediately and the ping process will then - // then immediately terminate. without such a request exec() will loop indefinitely. the ping process won't end but - // neither will your script. - - // although, in theory, the size of SSH_MSG_CHANNEL_REQUEST could exceed the maximum packet size established by - // SSH_MSG_CHANNEL_OPEN_CONFIRMATION, RFC4254#section-5.1 states that the "maximum packet size" refers to the - // "maximum size of an individual data packet". ie. SSH_MSG_CHANNEL_DATA. RFC4254#section-5.2 corroborates. - $packet = pack('CNNa*CNa*', - NET_SSH2_MSG_CHANNEL_REQUEST, $this->server_channels[NET_SSH2_CHANNEL_EXEC], strlen('exec'), 'exec', 1, strlen($command), $command); - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_REQUEST; - - $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_EXEC); - if ($response === false) { - return false; - } - - $this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_DATA; - - $output = ''; - while (true) { - $temp = $this->_get_channel_packet(NET_SSH2_CHANNEL_EXEC); - switch (true) { - case $temp === true: - return $output; - case $temp === false: - return false; - default: - $output.= $temp; - } - } - } - - /** - * Disconnect - * - * @access public - */ - function disconnect() - { - $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); - } - - /** - * 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() - { - $this->disconnect(); - } - - /** - * Gets Binary Packets - * - * See '6. Binary Packet Protocol' of rfc4253 for more info. - * - * @see Net_SSH2::_send_binary_packet() - * @return String - * @access private - */ - function _get_binary_packet() - { - if (feof($this->fsock)) { - user_error('Connection closed prematurely', E_USER_NOTICE); - return false; - } - - $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838 - $raw = fread($this->fsock, $this->decrypt_block_size); - $stop = strtok(microtime(), ' ') + strtok(''); - - if ($this->decrypt !== false) { - $raw = $this->decrypt->decrypt($raw); - } - - extract(unpack('Npacket_length/Cpadding_length', $this->_string_shift($raw, 5))); - - $remaining_length = $packet_length + 4 - $this->decrypt_block_size; - $buffer = ''; - while ($remaining_length > 0) { - $temp = fread($this->fsock, $remaining_length); - $buffer.= $temp; - $remaining_length-= strlen($temp); - } - if (!empty($buffer)) { - $raw.= $this->decrypt !== false ? $this->decrypt->decrypt($buffer) : $buffer; - $buffer = $temp = ''; - } - - $payload = $this->_string_shift($raw, $packet_length - $padding_length - 1); - $padding = $this->_string_shift($raw, $padding_length); // should leave $raw empty - - if ($this->hmac_check !== false) { - $hmac = fread($this->fsock, $this->hmac_size); - if ($hmac != $this->hmac_check->hash(pack('NNCa*', $this->get_seq_no, $packet_length, $padding_length, $payload . $padding))) { - user_error('Invalid HMAC', E_USER_NOTICE); - return false; - } - } - - //if ($this->decompress) { - // $payload = gzinflate(substr($payload, 2)); - //} - - $this->get_seq_no++; - - if (defined('NET_SSH2_LOGGING')) { - $temp = isset($this->message_numbers[ord($payload[0])]) ? $this->message_numbers[ord($payload[0])] : 'UNKNOWN'; - $this->message_number_log[] = '<- ' . $temp . - ' (' . round($stop - $start, 4) . 's)'; - if (NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) { - $this->message_log[] = substr($payload, 1); - } - } - - return $this->_filter($payload); - } - - /** - * Filter Binary Packets - * - * Because some binary packets need to be ignored... - * - * @see Net_SSH2::_get_binary_packet() - * @return String - * @access private - */ - function _filter($payload) - { - switch (ord($payload[0])) { - case NET_SSH2_MSG_DISCONNECT: - $this->_string_shift($payload, 1); - extract(unpack('Nreason_code/Nlength', $this->_string_shift($payload, 8))); - $this->errors[] = 'SSH_MSG_DISCONNECT: ' . $this->disconnect_reasons[$reason_code] . "\r\n" . utf8_decode($this->_string_shift($payload, $length)); - $this->bitmask = 0; - return false; - case NET_SSH2_MSG_IGNORE: - $payload = $this->_get_binary_packet(); - break; - case NET_SSH2_MSG_DEBUG: - $this->_string_shift($payload, 2); - extract(unpack('Nlength', $this->_string_shift($payload, 4))); - $this->errors[] = 'SSH_MSG_DEBUG: ' . utf8_decode($this->_string_shift($payload, $length)); - $payload = $this->_get_binary_packet(); - break; - case NET_SSH2_MSG_UNIMPLEMENTED: - return false; - case NET_SSH2_MSG_KEXINIT: - if ($this->session_id !== false) { - if (!$this->_key_exchange($payload)) { - $this->bitmask = 0; - return false; - } - $payload = $this->_get_binary_packet(); - } - } - - // see http://tools.ietf.org/html/rfc4252#section-5.4; only called when the encryption has been activated and when we haven't already logged in - if (($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR) && !($this->bitmap & NET_SSH2_MASK_LOGIN) && ord($payload[0]) == NET_SSH2_MSG_USERAUTH_BANNER) { - $this->_string_shift($payload, 1); - extract(unpack('Nlength', $this->_string_shift($payload, 4))); - $this->errors[] = 'SSH_MSG_USERAUTH_BANNER: ' . utf8_decode($this->_string_shift($payload, $length)); - $payload = $this->_get_binary_packet(); - } - - // only called when we've already logged in - if (($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR) && ($this->bitmap & NET_SSH2_MASK_LOGIN)) { - switch (ord($payload[0])) { - case NET_SSH2_MSG_GLOBAL_REQUEST: // see http://tools.ietf.org/html/rfc4254#section-4 - $this->_string_shift($payload, 1); - extract(unpack('Nlength', $this->_string_shift($payload))); - $this->errors[] = 'SSH_MSG_GLOBAL_REQUEST: ' . utf8_decode($this->_string_shift($payload, $length)); - - if (!$this->_send_binary_packet(pack('C', NET_SSH2_MSG_REQUEST_FAILURE))) { - return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); - } - - $payload = $this->_get_binary_packet(); - break; - case NET_SSH2_MSG_CHANNEL_OPEN: // see http://tools.ietf.org/html/rfc4254#section-5.1 - $this->_string_shift($payload, 1); - extract(unpack('N', $this->_string_shift($payload, 4))); - $this->errors[] = 'SSH_MSG_CHANNEL_OPEN: ' . utf8_decode($this->_string_shift($payload, $length)); - - $this->_string_shift($payload, 4); // skip over client channel - extract(unpack('Nserver_channel', $this->_string_shift($payload, 4))); - - $packet = pack('CN3a*Na*', - NET_SSH2_MSG_REQUEST_FAILURE, $server_channel, NET_SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED, 0, '', 0, ''); - - if (!$this->_send_binary_packet($packet)) { - return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); - } - - $payload = $this->_get_binary_packet(); - break; - case NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST: - $payload = $this->_get_binary_packet(); - } - } - - return $payload; - } - - /** - * Gets channel data - * - * Returns the data as a string if it's available and false if not. - * - * @param $client_channel - * @return Mixed - * @access private - */ - function _get_channel_packet($client_channel) - { - if (!empty($this->channel_buffers[$client_channel])) { - return array_shift($this->channel_buffers[$client_channel]); - } - - while (true) { - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server', E_USER_NOTICE); - return false; - } - - extract(unpack('Ctype/Nchannel', $this->_string_shift($response, 5))); - - switch ($this->channel_status[$channel]) { - case NET_SSH2_MSG_CHANNEL_OPEN: - switch ($type) { - case NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION: - extract(unpack('Nserver_channel', $this->_string_shift($response, 4))); - $this->server_channels[$client_channel] = $server_channel; - $this->_string_shift($response, 4); // skip over (server) window size - $temp = unpack('Npacket_size_client_to_server', $this->_string_shift($response, 4)); - $this->packet_size_client_to_server[$client_channel] = $temp['packet_size_client_to_server']; - return true; - //case NET_SSH2_MSG_CHANNEL_OPEN_FAILURE: - default: - user_error('Unable to open channel', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); - } - break; - case NET_SSH2_MSG_CHANNEL_REQUEST: - switch ($type) { - case NET_SSH2_MSG_CHANNEL_SUCCESS: - return true; - //case NET_SSH2_MSG_CHANNEL_FAILURE: - default: - user_error('Unable to request pseudo-terminal', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); - } - - } - - switch ($type) { - case NET_SSH2_MSG_CHANNEL_DATA: - if ($client_channel == NET_SSH2_CHANNEL_EXEC) { - // SCP requires null packets, such as this, be sent. further, in the case of the ssh.com SSH server - // this actually seems to make things twice as fast. more to the point, the message right after - // SSH_MSG_CHANNEL_DATA (usually SSH_MSG_IGNORE) won't block for as long as it would have otherwise. - // in OpenSSH it slows things down but only by a couple thousandths of a second. - $this->_send_channel_packet($client_channel, chr(0)); - } - extract(unpack('Nlength', $this->_string_shift($response, 4))); - $data = $this->_string_shift($response, $length); - if ($client_channel == $channel) { - return $data; - } - if (!isset($this->channel_buffers[$client_channel])) { - $this->channel_buffers[$client_channel] = array(); - } - $this->channel_buffers[$client_channel][] = $data; - break; - case NET_SSH2_MSG_CHANNEL_EXTENDED_DATA: - if ($client_channel == NET_SSH2_CHANNEL_EXEC) { - $this->_send_channel_packet($client_channel, chr(0)); - } - // currently, there's only one possible value for $data_type_code: NET_SSH2_EXTENDED_DATA_STDERR - extract(unpack('Ndata_type_code/Nlength', $this->_string_shift($response, 8))); - $data = $this->_string_shift($response, $length); - if ($client_channel == $channel) { - return $data; - } - if (!isset($this->channel_buffers[$client_channel])) { - $this->channel_buffers[$client_channel] = array(); - } - $this->channel_buffers[$client_channel][] = $data; - break; - case NET_SSH2_MSG_CHANNEL_REQUEST: - extract(unpack('Nlength', $this->_string_shift($response, 4))); - $value = $this->_string_shift($response, $length); - switch ($value) { - case 'exit-signal': - $this->_string_shift($response, 1); - extract(unpack('Nlength', $this->_string_shift($response, 4))); - $this->errors[] = 'SSH_MSG_CHANNEL_REQUEST (exit-signal): ' . $this->_string_shift($response, $length); - $this->_string_shift($response, 1); - extract(unpack('Nlength', $this->_string_shift($response, 4))); - if ($length) { - $this->errors[count($this->errors)].= "\r\n" . $this->_string_shift($response, $length); - } - //case 'exit-status': - default: - // "Some systems may not implement signals, in which case they SHOULD ignore this message." - // -- http://tools.ietf.org/html/rfc4254#section-6.9 - break; - } - break; - case NET_SSH2_MSG_CHANNEL_CLOSE: - $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel])); - return true; - case NET_SSH2_MSG_CHANNEL_EOF: - break; - default: - user_error('Error reading channel data', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); - } - } - } - - /** - * Sends Binary Packets - * - * See '6. Binary Packet Protocol' of rfc4253 for more info. - * - * @param String $data - * @see Net_SSH2::_get_binary_packet() - * @return Boolean - * @access private - */ - function _send_binary_packet($data) - { - if (feof($this->fsock)) { - user_error('Connection closed prematurely', E_USER_NOTICE); - return false; - } - - //if ($this->compress) { - // // the -4 removes the checksum: - // // http://php.net/function.gzcompress#57710 - // $data = substr(gzcompress($data), 0, -4); - //} - - // 4 (packet length) + 1 (padding length) + 4 (minimal padding amount) == 9 - $packet_length = strlen($data) + 9; - // round up to the nearest $this->encrypt_block_size - $packet_length+= (($this->encrypt_block_size - 1) * $packet_length) % $this->encrypt_block_size; - // subtracting strlen($data) is obvious - subtracting 5 is necessary because of packet_length and padding_length - $padding_length = $packet_length - strlen($data) - 5; - - $padding = ''; - for ($i = 0; $i < $padding_length; $i++) { - $padding.= chr(crypt_random(0, 255)); - } - - // we subtract 4 from packet_length because the packet_length field isn't supposed to include itself - $packet = pack('NCa*', $packet_length - 4, $padding_length, $data . $padding); - - $hmac = $this->hmac_create !== false ? $this->hmac_create->hash(pack('Na*', $this->send_seq_no, $packet)) : ''; - $this->send_seq_no++; - - if ($this->encrypt !== false) { - $packet = $this->encrypt->encrypt($packet); - } - - $packet.= $hmac; - - $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838 - $result = strlen($packet) == fputs($this->fsock, $packet); - $stop = strtok(microtime(), ' ') + strtok(''); - - if (defined('NET_SSH2_LOGGING')) { - $temp = isset($this->message_numbers[ord($data[0])]) ? $this->message_numbers[ord($data[0])] : 'UNKNOWN'; - $this->message_number_log[] = '-> ' . $temp . - ' (' . round($stop - $start, 4) . 's)'; - if (NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) { - $this->message_log[] = substr($data, 1); - } - } - - return $result; - } - - /** - * Sends channel data - * - * Spans multiple SSH_MSG_CHANNEL_DATAs if appropriate - * - * @param Integer $client_channel - * @param String $data - * @return Boolean - * @access private - */ - function _send_channel_packet($client_channel, $data) - { - while (strlen($data) > $this->packet_size_client_to_server[$client_channel]) { - // resize the window, if appropriate - $this->window_size_client_to_server[$client_channel]-= $this->packet_size_client_to_server[$client_channel]; - if ($this->window_size_client_to_server[$client_channel] < 0) { - $packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$client_channel], $this->window_size); - if (!$this->_send_binary_packet($packet)) { - return false; - } - $this->window_size_client_to_server[$client_channel]+= $this->window_size; - } - - $packet = pack('CN2a*', - NET_SSH2_MSG_CHANNEL_DATA, - $this->server_channels[$client_channel], - $this->packet_size_client_to_server[$client_channel], - $this->_string_shift($data, $this->packet_size_client_to_server[$client_channel]) - ); - - if (!$this->_send_binary_packet($packet)) { - return false; - } - } - - // resize the window, if appropriate - $this->window_size_client_to_server[$client_channel]-= strlen($data); - if ($this->window_size_client_to_server[$client_channel] < 0) { - $packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$client_channel], $this->window_size); - if (!$this->_send_binary_packet($packet)) { - return false; - } - $this->window_size_client_to_server[$client_channel]+= $this->window_size; - } - - return $this->_send_binary_packet(pack('CN2a*', - NET_SSH2_MSG_CHANNEL_DATA, - $this->server_channels[$client_channel], - strlen($data), - $data)); - } - - /** - * Disconnect - * - * @param Integer $reason - * @return Boolean - * @access private - */ - function _disconnect($reason) - { - if ($this->bitmap) { - $data = pack('CNNa*Na*', NET_SSH2_MSG_DISCONNECT, $reason, 0, '', 0, ''); - $this->_send_binary_packet($data); - $this->bitmap = 0; - fclose($this->fsock); - return false; - } - } - - /** - * String Shift - * - * Inspired by array_shift - * - * @param String $string - * @param optional Integer $index - * @return String - * @access private - */ - function _string_shift(&$string, $index = 1) - { - $substr = substr($string, 0, $index); - $string = substr($string, $index); - return $substr; - } - - /** - * 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_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX, an array if NET_SSH2_LOGGING == NET_SSH2_LOG_SIMPLE and false if !defined('NET_SSH2_LOGGING') - * - * @access public - * @return String or Array - */ - function getLog() - { - if (!defined('NET_SSH2_LOGGING')) { - return false; - } - - switch (NET_SSH2_LOGGING) { - case NET_SSH2_LOG_SIMPLE: - return $this->message_number_log; - break; - case NET_SSH2_LOG_COMPLEX: - return $this->_format_log($this->message_log, $this->message_number_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) - { - static $boundary = ':', $long_width = 65, $short_width = 16; - - $output = ''; - for ($i = 0; $i < count($message_log); $i++) { - $output.= $message_number_log[$i] . "\r\n"; - $current_log = $message_log[$i]; - $j = 0; - do { - if (!empty($current_log)) { - $output.= str_pad(dechex($j), 7, '0', STR_PAD_LEFT) . '0 '; - } - $fragment = $this->_string_shift($current_log, $short_width); - $hex = substr( - preg_replace( - '#(.)#es', - '"' . $boundary . '" . str_pad(dechex(ord(substr("\\1", -1))), 2, "0", STR_PAD_LEFT)', - $fragment), - strlen($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, $long_width - $short_width, ' ') . $raw . "\r\n"; - $j++; - } while (!empty($current_log)); - $output.= "\r\n"; - } - - return $output; - } - - /** - * Returns all errors - * - * @return String - * @access public - */ - function getErrors() - { - return $this->errors; - } - - /** - * Returns the last error - * - * @return String - * @access public - */ - function getLastError() - { - return $this->errors[count($this->errors) - 1]; - } - - /** - * Return the server identification. - * - * @return String - * @access public - */ - function getServerIdentification() - { - return $this->server_identifier; - } - - /** - * Return a list of the key exchange algorithms the server supports. - * - * @return Array - * @access public - */ - function getKexAlgorithms() - { - return $this->kex_algorithms; - } - - /** - * Return a list of the host key (public key) algorithms the server supports. - * - * @return Array - * @access public - */ - function getServerHostKeyAlgorithms() - { - return $this->server_host_key_algorithms; - } - - /** - * Return a list of the (symmetric key) encryption algorithms the server supports, when receiving stuff from the client. - * - * @return Array - * @access public - */ - function getEncryptionAlgorithmsClient2Server() - { - return $this->encryption_algorithms_client_to_server; - } - - /** - * Return a list of the (symmetric key) encryption algorithms the server supports, when sending stuff to the client. - * - * @return Array - * @access public - */ - function getEncryptionAlgorithmsServer2Client() - { - return $this->encryption_algorithms_server_to_client; - } - - /** - * Return a list of the MAC algorithms the server supports, when receiving stuff from the client. - * - * @return Array - * @access public - */ - function getMACAlgorithmsClient2Server() - { - return $this->mac_algorithms_client_to_server; - } - - /** - * Return a list of the MAC algorithms the server supports, when sending stuff to the client. - * - * @return Array - * @access public - */ - function getMACAlgorithmsServer2Client() - { - return $this->mac_algorithms_server_to_client; - } - - /** - * Return a list of the compression algorithms the server supports, when receiving stuff from the client. - * - * @return Array - * @access public - */ - function getCompressionAlgorithmsClient2Server() - { - return $this->compression_algorithms_client_to_server; - } - - /** - * Return a list of the compression algorithms the server supports, when sending stuff to the client. - * - * @return Array - * @access public - */ - function getCompressionAlgorithmsServer2Client() - { - return $this->compression_algorithms_server_to_client; - } - - /** - * Return a list of the languages the server supports, when sending stuff to the client. - * - * @return Array - * @access public - */ - function getLanguagesServer2Client() - { - return $this->languages_server_to_client; - } - - /** - * Return a list of the languages the server supports, when receiving stuff from the client. - * - * @return Array - * @access public - */ - function getLanguagesClient2Server() - { - return $this->languages_client_to_server; - } - - /** - * Returns the server public host key. - * - * Caching this the first time you connect to a server and checking the result on subsequent connections - * is recommended. Returns false if the server signature is not signed correctly with the public host key. - * - * @return Mixed - * @access public - */ - function getServerPublicHostKey() - { - $signature = $this->signature; - $server_public_host_key = $this->server_public_host_key; - - extract(unpack('Nlength', $this->_string_shift($server_public_host_key, 4))); - $this->_string_shift($server_public_host_key, $length); - - switch ($this->signature_format) { - case 'ssh-dss': - $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4)); - $p = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256); - - $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4)); - $q = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256); - - $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4)); - $g = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256); - - $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4)); - $y = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256); - - /* The value for 'dss_signature_blob' is encoded as a string containing - r, followed by s (which are 160-bit integers, without lengths or - padding, unsigned, and in network byte order). */ - $temp = unpack('Nlength', $this->_string_shift($signature, 4)); - if ($temp['length'] != 40) { - user_error('Invalid signature', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - $r = new Math_BigInteger($this->_string_shift($signature, 20), 256); - $s = new Math_BigInteger($this->_string_shift($signature, 20), 256); - - if ($r->compare($q) >= 0 || $s->compare($q) >= 0) { - user_error('Invalid signature', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - $w = $s->modInverse($q); - - $u1 = $w->multiply(new Math_BigInteger(sha1($this->session_id), 16)); - list(, $u1) = $u1->divide($q); - - $u2 = $w->multiply($r); - list(, $u2) = $u2->divide($q); - - $g = $g->modPow($u1, $p); - $y = $y->modPow($u2, $p); - - $v = $g->multiply($y); - list(, $v) = $v->divide($p); - list(, $v) = $v->divide($q); - - if (!$v->equals($r)) { - user_error('Bad server signature', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE); - } - - break; - case 'ssh-rsa': - $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4)); - $e = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256); - - $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4)); - $n = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256); - $nLength = $temp['length']; - - /* - $temp = unpack('Nlength', $this->_string_shift($signature, 4)); - $signature = $this->_string_shift($signature, $temp['length']); - - if (!class_exists('Crypt_RSA')) { - require_once('Crypt/RSA.php'); - } - - $rsa = new Crypt_RSA(); - $rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1); - $rsa->loadKey(array('e' => $e, 'n' => $n), CRYPT_RSA_PUBLIC_FORMAT_RAW); - if (!$rsa->verify($this->session_id, $signature)) { - user_error('Bad server signature', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE); - } - */ - - $temp = unpack('Nlength', $this->_string_shift($signature, 4)); - $s = new Math_BigInteger($this->_string_shift($signature, $temp['length']), 256); - - // validate an RSA signature per "8.2 RSASSA-PKCS1-v1_5", "5.2.2 RSAVP1", and "9.1 EMSA-PSS" in the - // following URL: - // ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1.pdf - - // also, see SSHRSA.c (rsa2_verifysig) in PuTTy's source. - - if ($s->compare(new Math_BigInteger()) < 0 || $s->compare($n->subtract(new Math_BigInteger(1))) > 0) { - user_error('Invalid signature', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - $s = $s->modPow($e, $n); - $s = $s->toBytes(); - - $h = pack('N4H*', 0x00302130, 0x0906052B, 0x0E03021A, 0x05000414, sha1($this->session_id)); - $h = chr(0x01) . str_repeat(chr(0xFF), $nLength - 3 - strlen($h)) . $h; - - if ($s != $h) { - user_error('Bad server signature', E_USER_NOTICE); - return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE); - } - } - - return $this->server_public_host_key; - } -} \ No newline at end of file -- cgit v1.2.3