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SSH2.php
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SSH2.php
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<?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 $ssh->read('username@username:~$');
* $ssh->write("ls -la\n");
* echo $ssh->read('username@username:~$');
* ?>
* </code>
*
* LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @category Net
* @package Net_SSH2
* @author Jim Wigginton <terrafrost@php.net>
* @copyright MMVII Jim Wigginton
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @link http://phpseclib.sourceforge.net
*/
/**#@+
* Execution Bitmap Masks
*
* @see Net_SSH2::bitmap
* @access private
*/
define('NET_SSH2_MASK_CONSTRUCTOR', 0x00000001);
define('NET_SSH2_MASK_LOGIN_REQ', 0x00000002);
define('NET_SSH2_MASK_LOGIN', 0x00000004);
define('NET_SSH2_MASK_SHELL', 0x00000008);
/**#@-*/
/**#@+
* 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
define('NET_SSH2_CHANNEL_SHELL',1);
/**#@-*/
/**#@+
* @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);
/**
* Outputs the content real-time
*/
define('NET_SSH2_LOG_REALTIME', 3);
/**
* Dumps the content real-time to a file
*/
define('NET_SSH2_LOG_REALTIME_FILE', 4);
/**#@-*/
/**#@+
* @access public
* @see Net_SSH2::read()
*/
/**
* Returns when a string matching $expect exactly is found
*/
define('NET_SSH2_READ_SIMPLE', 1);
/**
* Returns when a string matching the regular expression $expect is found
*/
define('NET_SSH2_READ_REGEX', 2);
/**
* Make sure that the log never gets larger than this
*/
define('NET_SSH2_LOG_MAX_SIZE', 1024 * 1024);
/**#@-*/
/**
* 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_0.3';
/**
* The Socket Object
*
* @var Object
* @access private
*/
var $fsock;
/**
* Execution Bitmap
*
* The bits that are set represent functions that have been called already. This is used to determine
* if a requisite function has been successfully executed. If not, an error should be thrown.
*
* @var 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;
/**
* Exchange hash
*
* The current exchange hash
*
* @see Net_SSH2::_key_exchange()
* @var String
* @access private
*/
var $exchange_hash = 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 = 2GB)
*
* @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_server_to_client = 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 = '';
/**
* Interactive Buffer
*
* @see Net_SSH2::read()
* @var Array
* @access private
*/
var $interactiveBuffer = '';
/**
* Current log size
*
* Should never exceed NET_SSH2_LOG_MAX_SIZE
*
* @see Net_SSH2::_send_binary_packet()
* @see Net_SSH2::_get_binary_packet()
* @var Integer
* @access private
*/
var $log_size;
/**
* Timeout
*
* @see Net_SSH2::setTimeout()
* @access private
*/
var $timeout;
/**
* Current Timeout
*
* @see Net_SSH2::_get_channel_packet()
* @access private
*/
var $curTimeout;
/**
* Real-time log file pointer
*
* @see Net_SSH2::_append_log()
* @var Resource
* @access private
*/
var $realtime_log_file;
/**
* Real-time log file size
*
* @see Net_SSH2::_append_log()
* @var Integer
* @access private
*/
var $realtime_log_size;
/**
* Has the signature been validated?
*
* @see Net_SSH2::getServerPublicHostKey()
* @var Boolean
* @access private
*/
var $signature_validated = false;
/**
* Real-time log file wrap boolean
*
* @see Net_SSH2::_append_log()
* @access private
*/
var $realtime_log_wrap;
/**
* Flag to suppress stderr from output
*
* @see Net_SSH2::enableQuietMode()
* @access private
*/
var $quiet_mode = false;
/**
* Time of first network activity
*
* @access private
*/
var $last_packet;
/**
* Exit status returned from ssh if any
*
* @var Integer
* @access private
*/
var $exit_status;
/**
* Flag to request a PTY when using exec()
*
* @see Net_SSH2::enablePTY()
* @access private
*/
var $request_pty = false;
/**
* Flag set while exec() is running when using enablePTY()
*
* @access private
*/
var $in_request_pty_exec = false;
/**
* Contents of stdError
*
* @access private
*/
var $stdErrorLog;
/**
* The Last Interactive Response
*
* @see Net_SSH2::_keyboard_interactive_process()
* @access private
*/
var $last_interactive_response = '';
/**
* Keyboard Interactive Request / Responses
*
* @see Net_SSH2::_keyboard_interactive_process()
* @access private
*/
var $keyboard_requests_responses = array();
/**
* Banner Message
*
* Quoting from the RFC, "in some jurisdictions, sending a warning message before
* authentication may be relevant for getting legal protection."
*
* @see Net_SSH2::_filter()
* @see Net_SSH2::getBannerMessage()
* @access private
*/
var $banner_message = '';
/**
* Did read() timeout or return normally?
*
* @see Net_SSH2::isTimeout
* @access private
*/
var $is_timeout = false;
/**
* 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)
{
// Include Math_BigInteger
// Used to do Diffie-Hellman key exchange and DSA/RSA signature verification.
if (!class_exists('Math_BigInteger')) {
require_once('Math/BigInteger.php');
}
if (!function_exists('crypt_random_string')) {
require_once('Crypt/Random.php');
}
if (!class_exists('Crypt_Hash')) {
require_once('Crypt/Hash.php');
}
$this->last_packet = strtok(microtime(), ' ') + strtok(''); // == microtime(true) in PHP5
$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'),
array(60 => 'NET_SSH2_MSG_USERAUTH_INFO_REQUEST',
61 => 'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE')
);
$start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
$this->fsock = @fsockopen($host, $port, $errno, $errstr, $timeout);
if (!$this->fsock) {
user_error(rtrim("Cannot connect to $host. Error $errno. $errstr"));
return;
}
$elapsed = strtok(microtime(), ' ') + strtok('') - $start;
$timeout-= $elapsed;
if ($timeout <= 0) {
user_error(rtrim("Cannot connect to $host. Timeout error"));
return;
}
$read = array($this->fsock);
$write = $except = NULL;
$sec = floor($timeout);
$usec = 1000000 * ($timeout - $sec);
// on windows this returns a "Warning: Invalid CRT parameters detected" error
// the !count() is done as a workaround for <https://bugs.php.net/42682>
if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) {
user_error(rtrim("Cannot connect to $host. Banner timeout"));
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);
}
if (feof($this->fsock)) {
user_error('Connection closed by server');
return false;
}
$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->_append_log('<-', $extra . $temp);
$this->_append_log('->', $this->identifier . "\r\n");
}
$this->server_identifier = trim($temp, "\r\n");
if (strlen($extra)) {
$this->errors[] = utf8_decode($extra);
}
if ($matches[1] != '1.99' && $matches[1] != '2.0') {
user_error("Cannot connect to SSH $matches[1] servers");
return;
}
fputs($this->fsock, $this->identifier . "\r\n");
$response = $this->_get_binary_packet();
if ($response === false) {
user_error('Connection closed by server');
return;
}
if (ord($response[0]) != NET_SSH2_MSG_KEXINIT) {
user_error('Expected SSH_MSG_KEXINIT');
return;
}
if (!$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
// CTR modes 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
'blowfish-ctr', // OPTIONAL Blowfish in SDCTR mode
'twofish128-ctr', // OPTIONAL Twofish in SDCTR mode, with 128-bit key
'twofish192-ctr', // OPTIONAL Twofish with 192-bit key
'twofish256-ctr', // OPTIONAL Twofish with 256-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
'blowfish-cbc', // OPTIONAL Blowfish in CBC mode
'twofish128-cbc', // OPTIONAL Twofish with a 128-bit key
'twofish192-cbc', // OPTIONAL Twofish with a 192-bit key
'twofish256-cbc',
'twofish-cbc', // OPTIONAL alias for "twofish256-cbc"
// (this is being retained for historical reasons)
'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 $compression_algorithms = array(
'none' // REQUIRED no compression
//'zlib' // OPTIONAL ZLIB (LZ77) compression
);
// some SSH servers have buggy implementations of some of the above algorithms
switch ($this->server_identifier) {
case 'SSH-2.0-SSHD':
$mac_algorithms = array_values(array_diff(
$mac_algorithms,
array('hmac-sha1-96', 'hmac-md5-96')
));
}