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tgseclib/phpseclib/Net/SSH1.php

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<?php
/**
* Pure-PHP implementation of SSHv1.
*
* PHP version 5
*
* Here's a short example of how to use this library:
* <code>
* <?php
* include 'vendor/autoload.php';
*
* $ssh = new \phpseclib\Net\SSH1('www.domain.tld');
* if (!$ssh->login('username', 'password')) {
* exit('Login Failed');
* }
*
* echo $ssh->exec('ls -la');
* ?>
* </code>
*
* Here's another short example:
* <code>
* <?php
* include 'vendor/autoload.php';
*
* $ssh = new \phpseclib\Net\SSH1('www.domain.tld');
* if (!$ssh->login('username', 'password')) {
* exit('Login Failed');
* }
*
* echo $ssh->read('username@username:~$');
* $ssh->write("ls -la\n");
* echo $ssh->read('username@username:~$');
* ?>
* </code>
*
* More information on the SSHv1 specification can be found by reading
* {@link http://www.snailbook.com/docs/protocol-1.5.txt protocol-1.5.txt}.
*
* @category Net
* @package SSH1
* @author Jim Wigginton <terrafrost@php.net>
* @copyright 2007 Jim Wigginton
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @link http://phpseclib.sourceforge.net
*/
namespace phpseclib\Net;
use ParagonIE\ConstantTime\Hex;
use phpseclib\Crypt\DES;
use phpseclib\Crypt\Random;
use phpseclib\Crypt\TripleDES;
use phpseclib\Math\BigInteger;
use phpseclib\Common\Functions\Strings;
/**
* Pure-PHP implementation of SSHv1.
*
* @package SSH1
* @author Jim Wigginton <terrafrost@php.net>
* @access public
*/
class SSH1
{
/**#@+
* Encryption Methods
*
* @see \phpseclib\Net\SSH1::getSupportedCiphers()
* @access public
*/
/**
* No encryption
*
* Not supported.
*/
const CIPHER_NONE = 0;
/**
* IDEA in CFB mode
*
* Not supported.
*/
const CIPHER_IDEA = 1;
/**
* DES in CBC mode
*/
const CIPHER_DES = 2;
/**
* Triple-DES in CBC mode
*
* All implementations are required to support this
*/
const CIPHER_3DES = 3;
/**
* TRI's Simple Stream encryption CBC
*
* Not supported nor is it defined in the official SSH1 specs. OpenSSH, however, does define it (see cipher.h),
* although it doesn't use it (see cipher.c)
*/
const CIPHER_BROKEN_TSS = 4;
/**
* RC4
*
* Not supported.
*
* @internal According to the SSH1 specs:
*
* "The first 16 bytes of the session key are used as the key for
* the server to client direction. The remaining 16 bytes are used
* as the key for the client to server direction. This gives
* independent 128-bit keys for each direction."
*
* This library currently only supports encryption when the same key is being used for both directions. This is
* because there's only one $crypto object. Two could be added ($encrypt and $decrypt, perhaps).
*/
const CIPHER_RC4 = 5;
/**
* Blowfish
*
* Not supported nor is it defined in the official SSH1 specs. OpenSSH, however, defines it (see cipher.h) and
* uses it (see cipher.c)
*/
const CIPHER_BLOWFISH = 6;
/**#@-*/
/**#@+
* Authentication Methods
*
* @see \phpseclib\Net\SSH1::getSupportedAuthentications()
* @access public
*/
/**
* .rhosts or /etc/hosts.equiv
*/
const AUTH_RHOSTS = 1;
/**
* pure RSA authentication
*/
const AUTH_RSA = 2;
/**
* password authentication
*
* This is the only method that is supported by this library.
*/
const AUTH_PASSWORD = 3;
/**
* .rhosts with RSA host authentication
*/
const AUTH_RHOSTS_RSA = 4;
/**#@-*/
/**#@+
* Terminal Modes
*
* @link http://3sp.com/content/developer/maverick-net/docs/Maverick.SSH.PseudoTerminalModesMembers.html
* @access private
*/
const TTY_OP_END = 0;
/**#@-*/
/**
* The Response Type
*
* @see \phpseclib\Net\SSH1::_get_binary_packet()
* @access private
*/
const RESPONSE_TYPE = 1;
/**
* The Response Data
*
* @see \phpseclib\Net\SSH1::_get_binary_packet()
* @access private
*/
const RESPONSE_DATA = 2;
/**#@+
* Execution Bitmap Masks
*
* @see \phpseclib\Net\SSH1::bitmap
* @access private
*/
const MASK_CONSTRUCTOR = 0x00000001;
const MASK_CONNECTED = 0x00000002;
const MASK_LOGIN = 0x00000004;
const MASK_SHELL = 0x00000008;
/**#@-*/
/**#@+
* @access public
* @see \phpseclib\Net\SSH1::getLog()
*/
/**
* Returns the message numbers
*/
const LOG_SIMPLE = 1;
/**
* Returns the message content
*/
const LOG_COMPLEX = 2;
/**
* Outputs the content real-time
*/
const LOG_REALTIME = 3;
/**
* Dumps the content real-time to a file
*/
const LOG_REALTIME_FILE = 4;
/**#@-*/
/**#@+
* @access public
* @see \phpseclib\Net\SSH1::read()
*/
/**
* Returns when a string matching $expect exactly is found
*/
const READ_SIMPLE = 1;
/**
* Returns when a string matching the regular expression $expect is found
*/
const READ_REGEX = 2;
/**#@-*/
/**
* The SSH identifier
*
* @var string
* @access private
*/
private $identifier = 'SSH-1.5-phpseclib';
/**
* The Socket Object
*
* @var object
* @access private
*/
private $fsock;
/**
* The cryptography object
*
* @var object
* @access private
*/
private $crypto = false;
/**
* Execution Bitmap
*
* The bits that are set represent functions that have been called already. This is used to determine
* if a requisite function has been successfully executed. If not, an error should be thrown.
*
* @var int
* @access private
*/
private $bitmap = 0;
/**
* The Server Key Public Exponent
*
* Logged for debug purposes
*
* @see self::getServerKeyPublicExponent()
* @var string
* @access private
*/
private $server_key_public_exponent;
/**
* The Server Key Public Modulus
*
* Logged for debug purposes
*
* @see self::getServerKeyPublicModulus()
* @var string
* @access private
*/
private $server_key_public_modulus;
/**
* The Host Key Public Exponent
*
* Logged for debug purposes
*
* @see self::getHostKeyPublicExponent()
* @var string
* @access private
*/
private $host_key_public_exponent;
/**
* The Host Key Public Modulus
*
* Logged for debug purposes
*
* @see self::getHostKeyPublicModulus()
* @var string
* @access private
*/
private $host_key_public_modulus;
/**
* Supported Ciphers
*
* Logged for debug purposes
*
* @see self::getSupportedCiphers()
* @var array
* @access private
*/
private $supported_ciphers = [
self::CIPHER_NONE => 'No encryption',
self::CIPHER_IDEA => 'IDEA in CFB mode',
self::CIPHER_DES => 'DES in CBC mode',
self::CIPHER_3DES => 'Triple-DES in CBC mode',
self::CIPHER_BROKEN_TSS => 'TRI\'s Simple Stream encryption CBC',
self::CIPHER_RC4 => 'RC4',
self::CIPHER_BLOWFISH => 'Blowfish'
];
/**
* Supported Authentications
*
* Logged for debug purposes
*
* @see self::getSupportedAuthentications()
* @var array
* @access private
*/
private $supported_authentications = [
self::AUTH_RHOSTS => '.rhosts or /etc/hosts.equiv',
self::AUTH_RSA => 'pure RSA authentication',
self::AUTH_PASSWORD => 'password authentication',
self::AUTH_RHOSTS_RSA => '.rhosts with RSA host authentication'
];
/**
* Server Identification
*
* @see self::getServerIdentification()
* @var string
* @access private
*/
private $server_identification = '';
/**
* Protocol Flags
*
* @see self::__construct()
* @var array
* @access private
*/
private $protocol_flags = [];
/**
* Protocol Flag Log
*
* @see self::getLog()
* @var array
* @access private
*/
private $protocol_flag_log = [];
/**
* Message Log
*
* @see self::getLog()
* @var array
* @access private
*/
private $message_log = [];
/**
* Real-time log file pointer
*
* @see self::_append_log()
* @var resource
* @access private
*/
private $realtime_log_file;
/**
* Real-time log file size
*
* @see self::_append_log()
* @var int
* @access private
*/
private $realtime_log_size;
/**
* Real-time log file wrap boolean
*
* @see self::_append_log()
* @var bool
* @access private
*/
private $realtime_log_wrap;
/**
* Interactive Buffer
*
* @see self::read()
* @var array
* @access private
*/
private $interactiveBuffer = '';
/**
* Timeout
*
* @see self::setTimeout()
* @access private
*/
private $timeout;
/**
* Current Timeout
*
* @see self::_get_channel_packet()
* @access private
*/
private $curTimeout;
/**
* Log Boundary
*
* @see self::_format_log()
* @access private
*/
private $log_boundary = ':';
/**
* Log Long Width
*
* @see self::_format_log()
* @access private
*/
private $log_long_width = 65;
/**
* Log Short Width
*
* @see self::_format_log()
* @access private
*/
private $log_short_width = 16;
/**
* Hostname
*
* @see self::__construct()
* @see self::_connect()
* @var string
* @access private
*/
private $host;
/**
* Port Number
*
* @see self::__construct()
* @see self::_connect()
* @var int
* @access private
*/
private $port;
/**
* Timeout for initial connection
*
* Set by the constructor call. Calling setTimeout() is optional. If it's not called functions like
* exec() won't timeout unless some PHP setting forces it too. The timeout specified in the constructor,
* however, is non-optional. There will be a timeout, whether or not you set it. If you don't it'll be
* 10 seconds. It is used by fsockopen() in that function.
*
* @see self::__construct()
* @see self::_connect()
* @var int
* @access private
*/
private $connectionTimeout;
/**
* Default cipher
*
* @see self::__construct()
* @see self::_connect()
* @var int
* @access private
*/
private $cipher;
/**
* Default Constructor.
*
* Connects to an SSHv1 server
*
* @param string $host
* @param int $port
* @param int $timeout
* @param int $cipher
* @return \phpseclib\Net\SSH1
* @access public
*/
public function __construct($host, $port = 22, $timeout = 10, $cipher = self::CIPHER_3DES)
{
$this->protocol_flags = [
1 => 'NET_SSH1_MSG_DISCONNECT',
2 => 'NET_SSH1_SMSG_PUBLIC_KEY',
3 => 'NET_SSH1_CMSG_SESSION_KEY',
4 => 'NET_SSH1_CMSG_USER',
9 => 'NET_SSH1_CMSG_AUTH_PASSWORD',
10 => 'NET_SSH1_CMSG_REQUEST_PTY',
12 => 'NET_SSH1_CMSG_EXEC_SHELL',
13 => 'NET_SSH1_CMSG_EXEC_CMD',
14 => 'NET_SSH1_SMSG_SUCCESS',
15 => 'NET_SSH1_SMSG_FAILURE',
16 => 'NET_SSH1_CMSG_STDIN_DATA',
17 => 'NET_SSH1_SMSG_STDOUT_DATA',
18 => 'NET_SSH1_SMSG_STDERR_DATA',
19 => 'NET_SSH1_CMSG_EOF',
20 => 'NET_SSH1_SMSG_EXITSTATUS',
33 => 'NET_SSH1_CMSG_EXIT_CONFIRMATION'
];
$this->define_array($this->protocol_flags);
$this->host = $host;
$this->port = $port;
$this->connectionTimeout = $timeout;
$this->cipher = $cipher;
}
/**
* Connect to an SSHv1 server
*
* @return bool
* @throws \UnexpectedValueException on receipt of unexpected packets
* @throws \RuntimeException on other errors
* @access private
*/
private function connect()
{
$this->fsock = @fsockopen($this->host, $this->port, $errno, $errstr, $this->connectionTimeout);
if (!$this->fsock) {
throw new \RuntimeException(rtrim("Cannot connect to $host. Error $errno. $errstr"));
}
$this->server_identification = $init_line = fgets($this->fsock, 255);
if (defined('NET_SSH1_LOGGING')) {
$this->append_log('<-', $this->server_identification);
$this->append_log('->', $this->identifier . "\r\n");
}
if (!preg_match('#SSH-([0-9\.]+)-(.+)#', $init_line, $parts)) {
throw new \RuntimeException('Can only connect to SSH servers');
}
if ($parts[1][0] != 1) {
throw new \RuntimeException("Cannot connect to $parts[1] servers");
}
fputs($this->fsock, $this->identifier."\r\n");
$response = $this->get_binary_packet();
if ($response[self::RESPONSE_TYPE] != NET_SSH1_SMSG_PUBLIC_KEY) {
throw new \UnexpectedValueException('Expected SSH_SMSG_PUBLIC_KEY');
}
$anti_spoofing_cookie = Strings::shift($response[self::RESPONSE_DATA], 8);
Strings::shift($response[self::RESPONSE_DATA], 4);
if (strlen($response[self::RESPONSE_DATA]) < 2) {
return false;
}
$temp = unpack('nlen', Strings::shift($response[self::RESPONSE_DATA], 2));
$server_key_public_exponent = new BigInteger(Strings::shift($response[self::RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
$this->server_key_public_exponent = $server_key_public_exponent;
if (strlen($response[self::RESPONSE_DATA]) < 2) {
return false;
}
$temp = unpack('nlen', Strings::shift($response[self::RESPONSE_DATA], 2));
$server_key_public_modulus = new BigInteger(Strings::shift($response[self::RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
$this->server_key_public_modulus = $server_key_public_modulus;
Strings::shift($response[self::RESPONSE_DATA], 4);
if (strlen($response[self::RESPONSE_DATA]) < 2) {
return false;
}
$temp = unpack('nlen', Strings::shift($response[self::RESPONSE_DATA], 2));
$host_key_public_exponent = new BigInteger(Strings::shift($response[self::RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
$this->host_key_public_exponent = $host_key_public_exponent;
if (strlen($response[self::RESPONSE_DATA]) < 2) {
return false;
}
$temp = unpack('nlen', Strings::shift($response[self::RESPONSE_DATA], 2));
$host_key_public_modulus = new BigInteger(Strings::shift($response[self::RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
$this->host_key_public_modulus = $host_key_public_modulus;
Strings::shift($response[self::RESPONSE_DATA], 4);
// get a list of the supported ciphers
if (strlen($response[self::RESPONSE_DATA]) < 4) {
return false;
}
extract(unpack('Nsupported_ciphers_mask', Strings::shift($response[self::RESPONSE_DATA], 4)));
foreach ($this->supported_ciphers as $mask => $name) {
if (($supported_ciphers_mask & (1 << $mask)) == 0) {
unset($this->supported_ciphers[$mask]);
}
}
// get a list of the supported authentications
if (strlen($response[self::RESPONSE_DATA]) < 4) {
return false;
}
extract(unpack('Nsupported_authentications_mask', Strings::shift($response[self::RESPONSE_DATA], 4)));
foreach ($this->supported_authentications as $mask => $name) {
if (($supported_authentications_mask & (1 << $mask)) == 0) {
unset($this->supported_authentications[$mask]);
}
}
$session_id = md5($host_key_public_modulus->toBytes() . $server_key_public_modulus->toBytes() . $anti_spoofing_cookie, true);
$session_key = Random::string(32);
$double_encrypted_session_key = $session_key ^ str_pad($session_id, 32, chr(0));
if ($server_key_public_modulus->compare($host_key_public_modulus) < 0) {
$double_encrypted_session_key = $this->rsa_crypt(
$double_encrypted_session_key,
[
$server_key_public_exponent,
$server_key_public_modulus
]
);
$double_encrypted_session_key = $this->rsa_crypt(
$double_encrypted_session_key,
[
$host_key_public_exponent,
$host_key_public_modulus
]
);
} else {
$double_encrypted_session_key = $this->rsa_crypt(
$double_encrypted_session_key,
[
$host_key_public_exponent,
$host_key_public_modulus
]
);
$double_encrypted_session_key = $this->rsa_crypt(
$double_encrypted_session_key,
[
$server_key_public_exponent,
$server_key_public_modulus
]
);
}
$cipher = isset($this->supported_ciphers[$this->cipher]) ? $this->cipher : self::CIPHER_3DES;
$data = pack('C2a*na*N', NET_SSH1_CMSG_SESSION_KEY, $cipher, $anti_spoofing_cookie, 8 * strlen($double_encrypted_session_key), $double_encrypted_session_key, 0);
if (!$this->send_binary_packet($data)) {
throw new \RuntimeException('Error sending SSH_CMSG_SESSION_KEY');
}
switch ($cipher) {
//case self::CIPHER_NONE:
// $this->crypto = new \phpseclib\Crypt\Null();
// break;
case self::CIPHER_DES:
$this->crypto = new DES(DES::MODE_CBC);
$this->crypto->disablePadding();
$this->crypto->enableContinuousBuffer();
$this->crypto->setKey(substr($session_key, 0, 8));
// "The iv (initialization vector) is initialized to all zeroes."
$this->crypto->setIV(str_repeat("\0", 8));
break;
case self::CIPHER_3DES:
$this->crypto = new TripleDES(TripleDES::MODE_3CBC);
$this->crypto->disablePadding();
$this->crypto->enableContinuousBuffer();
$this->crypto->setKey(substr($session_key, 0, 24));
// "All three initialization vectors are initialized to zero."
$this->crypto->setIV(str_repeat("\0", 8));
break;
//case self::CIPHER_RC4:
// $this->crypto = new RC4();
// $this->crypto->enableContinuousBuffer();
// $this->crypto->setKey(substr($session_key, 0, 16));
// break;
}
$response = $this->get_binary_packet();
if ($response[self::RESPONSE_TYPE] != NET_SSH1_SMSG_SUCCESS) {
throw new \UnexpectedValueException('Expected SSH_SMSG_SUCCESS');
}
$this->bitmap = self::MASK_CONNECTED;
return true;
}
/**
* Login
*
* @param string $username
* @param string $password
* @return bool
* @throws \UnexpectedValueException on receipt of unexpected packets
* @throws \RuntimeException on other errors
* @access public
*/
public function login($username, $password = '')
{
if (!($this->bitmap & self::MASK_CONSTRUCTOR)) {
$this->bitmap |= self::MASK_CONSTRUCTOR;
if (!$this->connect()) {
return false;
}
}
if (!($this->bitmap & self::MASK_CONNECTED)) {
return false;
}
$data = pack('CNa*', NET_SSH1_CMSG_USER, strlen($username), $username);
if (!$this->send_binary_packet($data)) {
throw new \RuntimeException('Error sending SSH_CMSG_USER');
}
$response = $this->get_binary_packet();
if ($response === true) {
return false;
}
if ($response[self::RESPONSE_TYPE] == NET_SSH1_SMSG_SUCCESS) {
$this->bitmap |= self::MASK_LOGIN;
return true;
} elseif ($response[self::RESPONSE_TYPE] != NET_SSH1_SMSG_FAILURE) {
throw new \UnexpectedValueException('Expected SSH_SMSG_SUCCESS or SSH_SMSG_FAILURE');
}
$data = pack('CNa*', NET_SSH1_CMSG_AUTH_PASSWORD, strlen($password), $password);
if (!$this->send_binary_packet($data)) {
throw new \RuntimeException('Error sending SSH_CMSG_AUTH_PASSWORD');
}
// remove the username and password from the last logged packet
if (defined('NET_SSH1_LOGGING') && NET_SSH1_LOGGING == self::LOG_COMPLEX) {
$data = pack('CNa*', NET_SSH1_CMSG_AUTH_PASSWORD, strlen('password'), 'password');
$this->message_log[count($this->message_log) - 1] = $data;
}
$response = $this->get_binary_packet();
if ($response === true) {
return false;
}
if ($response[self::RESPONSE_TYPE] == NET_SSH1_SMSG_SUCCESS) {
$this->bitmap |= self::MASK_LOGIN;
return true;
} elseif ($response[self::RESPONSE_TYPE] == NET_SSH1_SMSG_FAILURE) {
return false;
} else {
throw new \UnexpectedValueException('Expected SSH_SMSG_SUCCESS or SSH_SMSG_FAILURE');
}
}
/**
* Set Timeout
*
* $ssh->exec('ping 127.0.0.1'); on a Linux host will never return and will run indefinitely. setTimeout() makes it so it'll timeout.
* Setting $timeout to false or 0 will mean there is no timeout.
*
* @param mixed $timeout
*/
public function setTimeout($timeout)
{
$this->timeout = $this->curTimeout = $timeout;
}
/**
* Executes a command on a non-interactive shell, returns the output, and quits.
*
* An SSH1 server will close the connection after a command has been executed on a non-interactive shell. SSH2
* servers don't, however, this isn't an SSH2 client. The way this works, on the server, is by initiating a
* shell with the -s option, as discussed in the following links:
*
* {@link http://www.faqs.org/docs/bashman/bashref_65.html http://www.faqs.org/docs/bashman/bashref_65.html}
* {@link http://www.faqs.org/docs/bashman/bashref_62.html http://www.faqs.org/docs/bashman/bashref_62.html}
*
* To execute further commands, a new \phpseclib\Net\SSH1 object will need to be created.
*
* Returns false on failure and the output, otherwise.
*
* @see self::interactiveRead()
* @see self::interactiveWrite()
* @param string $cmd
* @return mixed
* @throws \RuntimeException on error sending command
* @access public
*/
public function exec($cmd, $block = true)
{
if (!($this->bitmap & self::MASK_LOGIN)) {
throw new \RuntimeException('Operation disallowed prior to login()');
}
$data = pack('CNa*', NET_SSH1_CMSG_EXEC_CMD, strlen($cmd), $cmd);
if (!$this->send_binary_packet($data)) {
throw new \RuntimeException('Error sending SSH_CMSG_EXEC_CMD');
}
if (!$block) {
return true;
}
$output = '';
$response = $this->get_binary_packet();
if ($response !== false) {
do {
$output.= substr($response[self::RESPONSE_DATA], 4);
$response = $this->get_binary_packet();
} while (is_array($response) && $response[self::RESPONSE_TYPE] != NET_SSH1_SMSG_EXITSTATUS);
}
$data = pack('C', NET_SSH1_CMSG_EXIT_CONFIRMATION);
// i don't think it's really all that important if this packet gets sent or not.
$this->send_binary_packet($data);
fclose($this->fsock);
// reset the execution bitmap - a new \phpseclib\Net\SSH1 object needs to be created.
$this->bitmap = 0;
return $output;
}
/**
* Creates an interactive shell
*
* @see self::interactiveRead()
* @see self::interactiveWrite()
* @return bool
* @throws \UnexpectedValueException on receipt of unexpected packets
* @throws \RuntimeException on other errors
* @access private
*/
private function initShell()
{
// connect using the sample parameters in protocol-1.5.txt.
// according to wikipedia.org's entry on text terminals, "the fundamental type of application running on a text
// terminal is a command line interpreter or shell". thus, opening a terminal session to run the shell.
$data = pack('CNa*N4C', NET_SSH1_CMSG_REQUEST_PTY, strlen('vt100'), 'vt100', 24, 80, 0, 0, self::TTY_OP_END);
if (!$this->send_binary_packet($data)) {
throw new \RuntimeException('Error sending SSH_CMSG_REQUEST_PTY');
}
$response = $this->get_binary_packet();
if ($response === true) {
return false;
}
if ($response[self::RESPONSE_TYPE] != NET_SSH1_SMSG_SUCCESS) {
throw new \UnexpectedValueException('Expected SSH_SMSG_SUCCESS');
}
$data = pack('C', NET_SSH1_CMSG_EXEC_SHELL);
if (!$this->send_binary_packet($data)) {
throw new \RuntimeException('Error sending SSH_CMSG_EXEC_SHELL');
}
$this->bitmap |= self::MASK_SHELL;
//stream_set_blocking($this->fsock, 0);
return true;
}
/**
* Inputs a command into an interactive shell.
*
* @see self::interactiveWrite()
* @param string $cmd
* @return bool
* @access public
*/
public function write($cmd)
{
return $this->interactiveWrite($cmd);
}
/**
* Returns the output of an interactive shell when there's a match for $expect
*
* $expect can take the form of a string literal or, if $mode == self::READ__REGEX,
* a regular expression.
*
* @see self::write()
* @param string $expect
* @param int $mode
* @return bool
* @throws \RuntimeException on connection error
* @access public
*/
public function read($expect, $mode = self::READ__SIMPLE)
{
if (!($this->bitmap & self::MASK_LOGIN)) {
throw new \RuntimeException('Operation disallowed prior to login()');
}
if (!($this->bitmap & self::MASK_SHELL) && !$this->initShell()) {
throw new \RuntimeException('Unable to initiate an interactive shell session');
}
$match = $expect;
while (true) {
if ($mode == self::READ__REGEX) {
preg_match($expect, $this->interactiveBuffer, $matches);
$match = isset($matches[0]) ? $matches[0] : '';
}
$pos = strlen($match) ? strpos($this->interactiveBuffer, $match) : false;
if ($pos !== false) {
return Strings::shift($this->interactiveBuffer, $pos + strlen($match));
}
$response = $this->get_binary_packet();
if ($response === true) {
return Strings::shift($this->interactiveBuffer, strlen($this->interactiveBuffer));
}
$this->interactiveBuffer.= substr($response[self::RESPONSE_DATA], 4);
}
}
/**
* Inputs a command into an interactive shell.
*
* @see self::interactiveRead()
* @param string $cmd
* @return bool
* @throws \RuntimeException on connection error
* @access public
*/
public function interactiveWrite($cmd)
{
if (!($this->bitmap & self::MASK_LOGIN)) {
throw new \RuntimeException('Operation disallowed prior to login()');
}
if (!($this->bitmap & self::MASK_SHELL) && !$this->initShell()) {
throw new \RuntimeException('Unable to initiate an interactive shell session');
}
$data = pack('CNa*', NET_SSH1_CMSG_STDIN_DATA, strlen($cmd), $cmd);
if (!$this->send_binary_packet($data)) {
throw new \RuntimeException('Error sending SSH_CMSG_STDIN');
}
return true;
}
/**
* Returns the output of an interactive shell when no more output is available.
*
* Requires PHP 4.3.0 or later due to the use of the stream_select() function. If you see stuff like
* "^[[00m", you're seeing ANSI escape codes. According to
* {@link http://support.microsoft.com/kb/101875 How to Enable ANSI.SYS in a Command Window}, "Windows NT
* does not support ANSI escape sequences in Win32 Console applications", so if you're a Windows user,
* there's not going to be much recourse.
*
* @see self::interactiveRead()
* @return string
* @throws \RuntimeException on connection error
* @access public
*/
public function interactiveRead()
{
if (!($this->bitmap & self::MASK_LOGIN)) {
throw new \RuntimeException('Operation disallowed prior to login()');
}
if (!($this->bitmap & self::MASK_SHELL) && !$this->initShell()) {
throw new \RuntimeException('Unable to initiate an interactive shell session');
}
$read = [$this->fsock];
$write = $except = null;
if (stream_select($read, $write, $except, 0)) {
$response = $this->get_binary_packet();
return substr($response[self::RESPONSE_DATA], 4);
} else {
return '';
}
}
/**
* Disconnect
*
* @access public
*/
public function disconnect()
{
$this->disconnect_helper();
}
/**
* Destructor.
*
* Will be called, automatically, if you're supporting just PHP5. If you're supporting PHP4, you'll need to call
* disconnect().
*
* @access public
*/
public function __destruct()
{
$this->disconnect_helper();
}
/**
* Disconnect
*
* @param string $msg
* @access private
*/
private function disconnect_helper($msg = 'Client Quit')
{
if ($this->bitmap) {
$data = pack('C', NET_SSH1_CMSG_EOF);
$this->send_binary_packet($data);
/*
$response = $this->get_binary_packet();
if ($response === true) {
$response = [self::RESPONSE_TYPE => -1];
}
switch ($response[self::RESPONSE_TYPE]) {
case NET_SSH1_SMSG_EXITSTATUS:
$data = pack('C', NET_SSH1_CMSG_EXIT_CONFIRMATION);
break;
default:
$data = pack('CNa*', NET_SSH1_MSG_DISCONNECT, strlen($msg), $msg);
}
*/
$data = pack('CNa*', NET_SSH1_MSG_DISCONNECT, strlen($msg), $msg);
$this->send_binary_packet($data);
fclose($this->fsock);
$this->bitmap = 0;
}
}
/**
* Gets Binary Packets
*
* See 'The Binary Packet Protocol' of protocol-1.5.txt for more info.
*
* Also, this function could be improved upon by adding detection for the following exploit:
* http://www.securiteam.com/securitynews/5LP042K3FY.html
*
* @see self::_send_binary_packet()
* @return array
* @access private
*/
private function get_binary_packet()
{
if (feof($this->fsock)) {
//user_error('connection closed prematurely');
return false;
}
if ($this->curTimeout) {
$read = [$this->fsock];
$write = $except = null;
$start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
$sec = floor($this->curTimeout);
$usec = 1000000 * ($this->curTimeout - $sec);
// on windows this returns a "Warning: Invalid CRT parameters detected" error
if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) {
//$this->disconnect_helper('Timeout');
return true;
}
$elapsed = strtok(microtime(), ' ') + strtok('') - $start;
$this->curTimeout-= $elapsed;
}
$start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
$data = fread($this->fsock, 4);
if (strlen($data) < 4) {
return false;
}
$temp = unpack('Nlength', $data);
$padding_length = 8 - ($temp['length'] & 7);
$length = $temp['length'] + $padding_length;
$raw = '';
while ($length > 0) {
$temp = fread($this->fsock, $length);
$raw.= $temp;
$length-= strlen($temp);
}
$stop = strtok(microtime(), ' ') + strtok('');
if (strlen($raw) && $this->crypto !== false) {
$raw = $this->crypto->decrypt($raw);
}
$padding = substr($raw, 0, $padding_length);
$type = $raw[$padding_length];
$data = substr($raw, $padding_length + 1, -4);
if (strlen($raw) < 4) {
return false;
}
$temp = unpack('Ncrc', substr($raw, -4));
//if ( $temp['crc'] != $this->crc($padding . $type . $data) ) {
// user_error('Bad CRC in packet from server');
// return false;
//}
$type = ord($type);
if (defined('NET_SSH1_LOGGING')) {
$temp = isset($this->protocol_flags[$type]) ? $this->protocol_flags[$type] : 'UNKNOWN';
$temp = '<- ' . $temp .
' (' . round($stop - $start, 4) . 's)';
$this->append_log($temp, $data);
}
return [
self::RESPONSE_TYPE => $type,
self::RESPONSE_DATA => $data
];
}
/**
* Sends Binary Packets
*
* Returns true on success, false on failure.
*
* @see self::_get_binary_packet()
* @param string $data
* @return bool
* @access private
*/
private function send_binary_packet($data)
{
if (feof($this->fsock)) {
//user_error('connection closed prematurely');
return false;
}
$length = strlen($data) + 4;
$padding = Random::string(8 - ($length & 7));
$orig = $data;
$data = $padding . $data;
$data.= pack('N', $this->crc($data));
if ($this->crypto !== false) {
$data = $this->crypto->encrypt($data);
}
$packet = pack('Na*', $length, $data);
$start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
$result = strlen($packet) == fputs($this->fsock, $packet);
$stop = strtok(microtime(), ' ') + strtok('');
if (defined('NET_SSH1_LOGGING')) {
$temp = isset($this->protocol_flags[ord($orig[0])]) ? $this->protocol_flags[ord($orig[0])] : 'UNKNOWN';
$temp = '-> ' . $temp .
' (' . round($stop - $start, 4) . 's)';
$this->append_log($temp, $orig);
}
return $result;
}
/**
* Cyclic Redundancy Check (CRC)
*
* PHP's crc32 function is implemented slightly differently than the one that SSH v1 uses, so
* we've reimplemented it. A more detailed discussion of the differences can be found after
* $crc_lookup_table's initialization.
*
* @see self::_get_binary_packet()
* @see self::_send_binary_packet()
* @param string $data
* @return int
* @access private
*/
private function crc($data)
{
static $crc_lookup_table = [
0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
];
// For this function to yield the same output as PHP's crc32 function, $crc would have to be
// set to 0xFFFFFFFF, initially - not 0x00000000 as it currently is.
$crc = 0x00000000;
$length = strlen($data);
for ($i=0; $i<$length; $i++) {
// We AND $crc >> 8 with 0x00FFFFFF because we want the eight newly added bits to all
// be zero. PHP, unfortunately, doesn't always do this. 0x80000000 >> 8, as an example,
// yields 0xFF800000 - not 0x00800000. The following link elaborates:
// http://www.php.net/manual/en/language.operators.bitwise.php#57281
$crc = (($crc >> 8) & 0x00FFFFFF) ^ $crc_lookup_table[($crc & 0xFF) ^ ord($data[$i])];
}
// In addition to having to set $crc to 0xFFFFFFFF, initially, the return value must be XOR'd with
// 0xFFFFFFFF for this function to return the same thing that PHP's crc32 function would.
return $crc;
}
/**
* RSA Encrypt
*
* Returns mod(pow($m, $e), $n), where $n should be the product of two (large) primes $p and $q and where $e
* should be a number with the property that gcd($e, ($p - 1) * ($q - 1)) == 1. Could just make anything that
* calls this call modexp, instead, but I think this makes things clearer, maybe...
*
* @see self::__construct()
* @param BigInteger $m
* @param array $key
* @return BigInteger
* @access private
*/
private function rsa_crypt($m, $key)
{
/*
$rsa = new RSA();
$rsa->load($key, 'raw');
$rsa->setHash('sha1');
return $rsa->encrypt($m, RSA::PADDING_PKCS1);
*/
// To quote from protocol-1.5.txt:
// The most significant byte (which is only partial as the value must be
// less than the public modulus, which is never a power of two) is zero.
//
// The next byte contains the value 2 (which stands for public-key
// encrypted data in the PKCS standard [PKCS#1]). Then, there are non-
// zero random bytes to fill any unused space, a zero byte, and the data
// to be encrypted in the least significant bytes, the last byte of the
// data in the least significant byte.
// Presumably the part of PKCS#1 they're refering to is "Section 7.2.1 Encryption Operation",
// under "7.2 RSAES-PKCS1-v1.5" and "7 Encryption schemes" of the following URL:
// ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1.pdf
$modulus = $key[1]->toBytes();
$length = strlen($modulus) - strlen($m) - 3;
$random = '';
while (strlen($random) != $length) {
$block = Random::string($length - strlen($random));
$block = str_replace("\x00", '', $block);
$random.= $block;
}
$temp = chr(0) . chr(2) . $random . chr(0) . $m;
$m = new BigInteger($temp, 256);
$m = $m->modPow($key[0], $key[1]);
return $m->toBytes();
}
/**
* Define Array
*
* Takes any number of arrays whose indices are integers and whose values are strings and defines a bunch of
* named constants from it, using the value as the name of the constant and the index as the value of the constant.
* If any of the constants that would be defined already exists, none of the constants will be defined.
*
* @param array $array
* @access private
*/
private function define_array()
{
$args = func_get_args();
foreach ($args as $arg) {
foreach ($arg as $key => $value) {
if (!defined($value)) {
define($value, $key);
} else {
break 2;
}
}
}
}
/**
* Returns a log of the packets that have been sent and received.
*
* Returns a string if NET_SSH1_LOGGING == self::LOG_COMPLEX, an array if NET_SSH1_LOGGING == self::LOG_SIMPLE and false if !defined('NET_SSH1_LOGGING')
*
* @access public
* @return array|false|string
*/
public function getLog()
{
if (!defined('NET_SSH1_LOGGING')) {
return false;
}
switch (NET_SSH1_LOGGING) {
case self::LOG_SIMPLE:
return $this->message_number_log;
break;
case self::LOG_COMPLEX:
return $this->format_log($this->message_log, $this->protocol_flags_log);
break;
default:
return false;
}
}
/**
* Formats a log for printing
*
* @param array $message_log
* @param array $message_number_log
* @access private
* @return string
*/
private function format_log($message_log, $message_number_log)
{
$output = '';
for ($i = 0; $i < count($message_log); $i++) {
$output.= $message_number_log[$i] . "\r\n";
$current_log = $message_log[$i];
$j = 0;
do {
if (strlen($current_log)) {
$output.= str_pad(dechex($j), 7, '0', STR_PAD_LEFT) . '0 ';
}
$fragment = Strings::shift($current_log, $this->log_short_width);
$hex = substr(preg_replace_callback('#.#s', [$this, 'format_log_helper'], $fragment), strlen($this->log_boundary));
// replace non ASCII printable characters with dots
// http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters
// also replace < with a . since < messes up the output on web browsers
$raw = preg_replace('#[^\x20-\x7E]|<#', '.', $fragment);
$output.= str_pad($hex, $this->log_long_width - $this->log_short_width, ' ') . $raw . "\r\n";
$j++;
} while (strlen($current_log));
$output.= "\r\n";
}
return $output;
}
/**
* Helper function for _format_log
*
* For use with preg_replace_callback()
*
* @param array $matches
* @access private
* @return string
*/
private function format_log_helper($matches)
{
return $this->log_boundary . str_pad(dechex(ord($matches[0])), 2, '0', STR_PAD_LEFT);
}
/**
* Return the server key public exponent
*
* Returns, by default, the base-10 representation. If $raw_output is set to true, returns, instead,
* the raw bytes. This behavior is similar to PHP's md5() function.
*
* @param bool $raw_output
* @return string
* @access public
*/
public function getServerKeyPublicExponent($raw_output = false)
{
return $raw_output ? $this->server_key_public_exponent->toBytes() : $this->server_key_public_exponent->toString();
}
/**
* Return the server key public modulus
*
* Returns, by default, the base-10 representation. If $raw_output is set to true, returns, instead,
* the raw bytes. This behavior is similar to PHP's md5() function.
*
* @param bool $raw_output
* @return string
* @access public
*/
public function getServerKeyPublicModulus($raw_output = false)
{
return $raw_output ? $this->server_key_public_modulus->toBytes() : $this->server_key_public_modulus->toString();
}
/**
* Return the host key public exponent
*
* Returns, by default, the base-10 representation. If $raw_output is set to true, returns, instead,
* the raw bytes. This behavior is similar to PHP's md5() function.
*
* @param bool $raw_output
* @return string
* @access public
*/
public function getHostKeyPublicExponent($raw_output = false)
{
return $raw_output ? $this->host_key_public_exponent->toBytes() : $this->host_key_public_exponent->toString();
}
/**
* Return the host key public modulus
*
* Returns, by default, the base-10 representation. If $raw_output is set to true, returns, instead,
* the raw bytes. This behavior is similar to PHP's md5() function.
*
* @param bool $raw_output
* @return string
* @access public
*/
public function getHostKeyPublicModulus($raw_output = false)
{
return $raw_output ? $this->host_key_public_modulus->toBytes() : $this->host_key_public_modulus->toString();
}
/**
* Return a list of ciphers supported by SSH1 server.
*
* Just because a cipher is supported by an SSH1 server doesn't mean it's supported by this library. If $raw_output
* is set to true, returns, instead, an array of constants. ie. instead of ['Triple-DES in CBC mode'], you'll
* get [self::CIPHER_3DES].
*
* @param bool $raw_output
* @return array
* @access public
*/
public function getSupportedCiphers($raw_output = false)
{
return $raw_output ? array_keys($this->supported_ciphers) : array_values($this->supported_ciphers);
}
/**
* Return a list of authentications supported by SSH1 server.
*
* Just because a cipher is supported by an SSH1 server doesn't mean it's supported by this library. If $raw_output
* is set to true, returns, instead, an array of constants. ie. instead of ['password authentication'], you'll
* get [self::AUTH_PASSWORD].
*
* @param bool $raw_output
* @return array
* @access public
*/
public function getSupportedAuthentications($raw_output = false)
{
return $raw_output ? array_keys($this->supported_authentications) : array_values($this->supported_authentications);
}
/**
* Return the server identification.
*
* @return string
* @access public
*/
public function getServerIdentification()
{
return rtrim($this->server_identification);
}
/**
* Logs data packets
*
* Makes sure that only the last 1MB worth of packets will be logged
*
* @param string $data
* @access private
*/
private function append_log($protocol_flags, $message)
{
switch (NET_SSH1_LOGGING) {
// useful for benchmarks
case self::LOG_SIMPLE:
$this->protocol_flags_log[] = $protocol_flags;
break;
// the most useful log for SSH1
case self::LOG_COMPLEX:
$this->protocol_flags_log[] = $protocol_flags;
Strings::shift($message);
$this->log_size+= strlen($message);
$this->message_log[] = $message;
while ($this->log_size > self::LOG_MAX_SIZE) {
$this->log_size-= strlen(array_shift($this->message_log));
array_shift($this->protocol_flags_log);
}
break;
// dump the output out realtime; packets may be interspersed with non packets,
// passwords won't be filtered out and select other packets may not be correctly
// identified
case self::LOG_REALTIME:
echo "<pre>\r\n" . $this->format_log([$message], [$protocol_flags]) . "\r\n</pre>\r\n";
@flush();
@ob_flush();
break;
// basically the same thing as self::LOG_REALTIME with the caveat that self::LOG_REALTIME_FILE
// needs to be defined and that the resultant log file will be capped out at self::LOG_MAX_SIZE.
// the earliest part of the log file is denoted by the first <<< START >>> and is not going to necessarily
// at the beginning of the file
case self::LOG_REALTIME_FILE:
if (!isset($this->realtime_log_file)) {
// PHP doesn't seem to like using constants in fopen()
$filename = self::LOG_REALTIME_FILE;
$fp = fopen($filename, 'w');
$this->realtime_log_file = $fp;
}
if (!is_resource($this->realtime_log_file)) {
break;
}
$entry = $this->format_log([$message], [$protocol_flags]);
if ($this->realtime_log_wrap) {
$temp = "<<< START >>>\r\n";
$entry.= $temp;
fseek($this->realtime_log_file, ftell($this->realtime_log_file) - strlen($temp));
}
$this->realtime_log_size+= strlen($entry);
if ($this->realtime_log_size > self::LOG_MAX_SIZE) {
fseek($this->realtime_log_file, 0);
$this->realtime_log_size = strlen($entry);
$this->realtime_log_wrap = true;
}
fputs($this->realtime_log_file, $entry);
}
}
}
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