diff options
| author | Mike Macgirvin <mike@macgirvin.com> | 2010-10-07 02:53:31 -0700 |
|---|---|---|
| committer | Mike Macgirvin <mike@macgirvin.com> | 2010-10-07 02:53:31 -0700 |
| commit | 4daed0a009645377596fcf495a64edb32ee2245e (patch) | |
| tree | 072a695c28c96f33fcaad581c96f224da8e49efd /phpsec/Net/SSH2.php | |
| parent | 9c10ada9060c9745f49652469e172be8152f6cad (diff) | |
| download | volse-hubzilla-4daed0a009645377596fcf495a64edb32ee2245e.tar.gz volse-hubzilla-4daed0a009645377596fcf495a64edb32ee2245e.tar.bz2 volse-hubzilla-4daed0a009645377596fcf495a64edb32ee2245e.zip | |
Needed for salmon which seems to have a fixation with forcing you to encode/decode ASN.1. Sick.
Diffstat (limited to 'phpsec/Net/SSH2.php')
| -rw-r--r-- | phpsec/Net/SSH2.php | 2302 |
1 files changed, 2302 insertions, 0 deletions
diff --git a/phpsec/Net/SSH2.php b/phpsec/Net/SSH2.php new file mode 100644 index 000000000..aa9f6dbe5 --- /dev/null +++ b/phpsec/Net/SSH2.php @@ -0,0 +1,2302 @@ +<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Pure-PHP implementation of SSHv2.
+ *
+ * PHP versions 4 and 5
+ *
+ * Here are some examples of how to use this library:
+ * <code>
+ * <?php
+ * include('Net/SSH2.php');
+ *
+ * $ssh = new Net_SSH2('www.domain.tld');
+ * if (!$ssh->login('username', 'password')) {
+ * exit('Login Failed');
+ * }
+ *
+ * echo $ssh->exec('pwd');
+ * echo $ssh->exec('ls -la');
+ * ?>
+ * </code>
+ *
+ * <code>
+ * <?php
+ * include('Crypt/RSA.php');
+ * include('Net/SSH2.php');
+ *
+ * $key = new Crypt_RSA();
+ * //$key->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');
+ * ?>
+ * </code>
+ *
+ * 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 <terrafrost@php.net>
+ * @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 <terrafrost@php.net>
+ * @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 <http://tools.ietf.org/html/rfc4345#section-4>:
+ '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 <http://tools.ietf.org/html/rfc4344#section-4>:
+ '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 |