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Diffstat (limited to 'phpsec/Net/SSH2.php')
| -rw-r--r-- | phpsec/Net/SSH2.php | 2302 |
1 files changed, 0 insertions, 2302 deletions
diff --git a/phpsec/Net/SSH2.php b/phpsec/Net/SSH2.php deleted file mode 100644 index aa9f6dbe5..000000000 --- a/phpsec/Net/SSH2.php +++ /dev/null @@ -1,2302 +0,0 @@ -<?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 |