diff options
Diffstat (limited to 'libs/phpseclib-1.0.4/phpseclib/Net/SSH2.php')
| -rw-r--r-- | libs/phpseclib-1.0.4/phpseclib/Net/SSH2.php | 4292 |
1 files changed, 0 insertions, 4292 deletions
diff --git a/libs/phpseclib-1.0.4/phpseclib/Net/SSH2.php b/libs/phpseclib-1.0.4/phpseclib/Net/SSH2.php deleted file mode 100644 index 8281e73..0000000 --- a/libs/phpseclib-1.0.4/phpseclib/Net/SSH2.php +++ /dev/null @@ -1,4292 +0,0 @@ -<?php - -/** - * 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 2007 Jim Wigginton - * @license http://www.opensource.org/licenses/mit-license.html MIT License - * @link http://phpseclib.sourceforge.net - */ - -/**#@+ - * Execution Bitmap Masks - * - * @see self::bitmap - * @access private - */ -define('NET_SSH2_MASK_CONSTRUCTOR', 0x00000001); -define('NET_SSH2_MASK_CONNECTED', 0x00000002); -define('NET_SSH2_MASK_LOGIN_REQ', 0x00000004); -define('NET_SSH2_MASK_LOGIN', 0x00000008); -define('NET_SSH2_MASK_SHELL', 0x00000010); -define('NET_SSH2_MASK_WINDOW_ADJUST', 0x00000020); -/**#@-*/ - -/**#@+ - * 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 self::_send_channel_packet() - * @see self::_get_channel_packet() - * @access private - */ -define('NET_SSH2_CHANNEL_EXEC', 0); // PuTTy uses 0x100 -define('NET_SSH2_CHANNEL_SHELL', 1); -define('NET_SSH2_CHANNEL_SUBSYSTEM', 2); -define('NET_SSH2_CHANNEL_AGENT_FORWARD', 3); -/**#@-*/ - -/**#@+ - * @access public - * @see self::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 self::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. - * - * @package Net_SSH2 - * @author Jim Wigginton <terrafrost@php.net> - * @access public - */ -class Net_SSH2 -{ - /** - * The SSH identifier - * - * @var string - * @access private - */ - var $identifier; - - /** - * 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 int - * @access private - */ - var $bitmap = 0; - - /** - * Error information - * - * @see self::getErrors() - * @see self::getLastError() - * @var string - * @access private - */ - var $errors = array(); - - /** - * Server Identifier - * - * @see self::getServerIdentification() - * @var array|false - * @access private - */ - var $server_identifier = false; - - /** - * Key Exchange Algorithms - * - * @see self::getKexAlgorithims() - * @var array|false - * @access private - */ - var $kex_algorithms = false; - - /** - * Minimum Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods - * - * @see self::_key_exchange() - * @var int - * @access private - */ - var $kex_dh_group_size_min = 1536; - - /** - * Preferred Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods - * - * @see self::_key_exchange() - * @var int - * @access private - */ - var $kex_dh_group_size_preferred = 2048; - - /** - * Maximum Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods - * - * @see self::_key_exchange() - * @var int - * @access private - */ - var $kex_dh_group_size_max = 4096; - - /** - * Server Host Key Algorithms - * - * @see self::getServerHostKeyAlgorithms() - * @var array|false - * @access private - */ - var $server_host_key_algorithms = false; - - /** - * Encryption Algorithms: Client to Server - * - * @see self::getEncryptionAlgorithmsClient2Server() - * @var array|false - * @access private - */ - var $encryption_algorithms_client_to_server = false; - - /** - * Encryption Algorithms: Server to Client - * - * @see self::getEncryptionAlgorithmsServer2Client() - * @var array|false - * @access private - */ - var $encryption_algorithms_server_to_client = false; - - /** - * MAC Algorithms: Client to Server - * - * @see self::getMACAlgorithmsClient2Server() - * @var array|false - * @access private - */ - var $mac_algorithms_client_to_server = false; - - /** - * MAC Algorithms: Server to Client - * - * @see self::getMACAlgorithmsServer2Client() - * @var array|false - * @access private - */ - var $mac_algorithms_server_to_client = false; - - /** - * Compression Algorithms: Client to Server - * - * @see self::getCompressionAlgorithmsClient2Server() - * @var array|false - * @access private - */ - var $compression_algorithms_client_to_server = false; - - /** - * Compression Algorithms: Server to Client - * - * @see self::getCompressionAlgorithmsServer2Client() - * @var array|false - * @access private - */ - var $compression_algorithms_server_to_client = false; - - /** - * Languages: Server to Client - * - * @see self::getLanguagesServer2Client() - * @var array|false - * @access private - */ - var $languages_server_to_client = false; - - /** - * Languages: Client to Server - * - * @see self::getLanguagesClient2Server() - * @var array|false - * @access private - */ - var $languages_client_to_server = false; - - /** - * 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 self::Net_SSH2() - * @see self::_send_binary_packet() - * @var int - * @access private - */ - var $encrypt_block_size = 8; - - /** - * Block Size for Client to Server Encryption - * - * @see self::Net_SSH2() - * @see self::_get_binary_packet() - * @var int - * @access private - */ - var $decrypt_block_size = 8; - - /** - * Server to Client Encryption Object - * - * @see self::_get_binary_packet() - * @var object - * @access private - */ - var $decrypt = false; - - /** - * Client to Server Encryption Object - * - * @see self::_send_binary_packet() - * @var object - * @access private - */ - var $encrypt = false; - - /** - * Client to Server HMAC Object - * - * @see self::_send_binary_packet() - * @var object - * @access private - */ - var $hmac_create = false; - - /** - * Server to Client HMAC Object - * - * @see self::_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 self::_get_binary_packet() - * @var int - * @access private - */ - var $hmac_size = false; - - /** - * Server Public Host Key - * - * @see self::getServerPublicHostKey() - * @var string - * @access private - */ - var $server_public_host_key; - - /** - * Session identifier - * - * "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 self::_key_exchange() - * @var string - * @access private - */ - var $session_id = false; - - /** - * Exchange hash - * - * The current exchange hash - * - * @see self::_key_exchange() - * @var string - * @access private - */ - var $exchange_hash = false; - - /** - * Message Numbers - * - * @see self::Net_SSH2() - * @var array - * @access private - */ - var $message_numbers = array(); - - /** - * Disconnection Message 'reason codes' defined in RFC4253 - * - * @see self::Net_SSH2() - * @var array - * @access private - */ - var $disconnect_reasons = array(); - - /** - * SSH_MSG_CHANNEL_OPEN_FAILURE 'reason codes', defined in RFC4254 - * - * @see self::Net_SSH2() - * @var array - * @access private - */ - var $channel_open_failure_reasons = array(); - - /** - * Terminal Modes - * - * @link http://tools.ietf.org/html/rfc4254#section-8 - * @see self::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 self::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 self::_send_binary_packet() - * @var int - * @access private - */ - var $send_seq_no = 0; - - /** - * Get Sequence Number - * - * See 'Section 6.4. Data Integrity' of rfc4253 for more info. - * - * @see self::_get_binary_packet() - * @var int - * @access private - */ - var $get_seq_no = 0; - - /** - * Server Channels - * - * Maps client channels to server channels - * - * @see self::_get_channel_packet() - * @see self::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 self::_get_channel_packet() - * @see self::exec() - * @var array - * @access private - */ - var $channel_buffers = array(); - - /** - * Channel Status - * - * Contains the type of the last sent message - * - * @see self::_get_channel_packet() - * @var array - * @access private - */ - var $channel_status = array(); - - /** - * Packet Size - * - * Maximum packet size indexed by channel - * - * @see self::_send_channel_packet() - * @var array - * @access private - */ - var $packet_size_client_to_server = array(); - - /** - * Message Number Log - * - * @see self::getLog() - * @var array - * @access private - */ - var $message_number_log = array(); - - /** - * Message Log - * - * @see self::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 int - * @see self::_send_channel_packet() - * @see self::exec() - * @access private - */ - var $window_size = 0x7FFFFFFF; - - /** - * Window size, server to client - * - * Window size indexed by channel - * - * @see self::_send_channel_packet() - * @var array - * @access private - */ - var $window_size_server_to_client = array(); - - /** - * Window size, client to server - * - * Window size indexed by channel - * - * @see self::_get_channel_packet() - * @var array - * @access private - */ - var $window_size_client_to_server = array(); - - /** - * Server signature - * - * Verified against $this->session_id - * - * @see self::getServerPublicHostKey() - * @var string - * @access private - */ - var $signature = ''; - - /** - * Server signature format - * - * ssh-rsa or ssh-dss. - * - * @see self::getServerPublicHostKey() - * @var string - * @access private - */ - var $signature_format = ''; - - /** - * Interactive Buffer - * - * @see self::read() - * @var array - * @access private - */ - var $interactiveBuffer = ''; - - /** - * Current log size - * - * Should never exceed NET_SSH2_LOG_MAX_SIZE - * - * @see self::_send_binary_packet() - * @see self::_get_binary_packet() - * @var int - * @access private - */ - var $log_size; - - /** - * Timeout - * - * @see self::setTimeout() - * @access private - */ - var $timeout; - - /** - * Current Timeout - * - * @see self::_get_channel_packet() - * @access private - */ - var $curTimeout; - - /** - * Real-time log file pointer - * - * @see self::_append_log() - * @var resource - * @access private - */ - var $realtime_log_file; - - /** - * Real-time log file size - * - * @see self::_append_log() - * @var int - * @access private - */ - var $realtime_log_size; - - /** - * Has the signature been validated? - * - * @see self::getServerPublicHostKey() - * @var bool - * @access private - */ - var $signature_validated = false; - - /** - * Real-time log file wrap boolean - * - * @see self::_append_log() - * @access private - */ - var $realtime_log_wrap; - - /** - * Flag to suppress stderr from output - * - * @see self::enableQuietMode() - * @access private - */ - var $quiet_mode = false; - - /** - * Time of first network activity - * - * @var int - * @access private - */ - var $last_packet; - - /** - * Exit status returned from ssh if any - * - * @var int - * @access private - */ - var $exit_status; - - /** - * Flag to request a PTY when using exec() - * - * @var bool - * @see self::enablePTY() - * @access private - */ - var $request_pty = false; - - /** - * Flag set while exec() is running when using enablePTY() - * - * @var bool - * @access private - */ - var $in_request_pty_exec = false; - - /** - * Flag set after startSubsystem() is called - * - * @var bool - * @access private - */ - var $in_subsystem; - - /** - * Contents of stdError - * - * @var string - * @access private - */ - var $stdErrorLog; - - /** - * The Last Interactive Response - * - * @see self::_keyboard_interactive_process() - * @var string - * @access private - */ - var $last_interactive_response = ''; - - /** - * Keyboard Interactive Request / Responses - * - * @see self::_keyboard_interactive_process() - * @var array - * @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 self::_filter() - * @see self::getBannerMessage() - * @var string - * @access private - */ - var $banner_message = ''; - - /** - * Did read() timeout or return normally? - * - * @see self::isTimeout() - * @var bool - * @access private - */ - var $is_timeout = false; - - /** - * Log Boundary - * - * @see self::_format_log() - * @var string - * @access private - */ - var $log_boundary = ':'; - - /** - * Log Long Width - * - * @see self::_format_log() - * @var int - * @access private - */ - var $log_long_width = 65; - - /** - * Log Short Width - * - * @see self::_format_log() - * @var int - * @access private - */ - var $log_short_width = 16; - - /** - * Hostname - * - * @see self::Net_SSH2() - * @see self::_connect() - * @var string - * @access private - */ - var $host; - - /** - * Port Number - * - * @see self::Net_SSH2() - * @see self::_connect() - * @var int - * @access private - */ - var $port; - - /** - * Number of columns for terminal window size - * - * @see self::getWindowColumns() - * @see self::setWindowColumns() - * @see self::setWindowSize() - * @var int - * @access private - */ - var $windowColumns = 80; - - /** - * Number of columns for terminal window size - * - * @see self::getWindowRows() - * @see self::setWindowRows() - * @see self::setWindowSize() - * @var int - * @access private - */ - var $windowRows = 24; - - /** - * Crypto Engine - * - * @see self::setCryptoEngine() - * @see self::_key_exchange() - * @var int - * @access private - */ - var $crypto_engine = false; - - /** - * A System_SSH_Agent for use in the SSH2 Agent Forwarding scenario - * - * @var System_SSH_Agent - * @access private - */ - var $agent; - - /** - * Default Constructor. - * - * $host can either be a string, representing the host, or a stream resource. - * - * @param mixed $host - * @param int $port - * @param int $timeout - * @see self::login() - * @return Net_SSH2 - * @access public - */ - function __construct($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')) { - include_once 'Math/BigInteger.php'; - } - - if (!function_exists('crypt_random_string')) { - include_once 'Crypt/Random.php'; - } - - if (!class_exists('Crypt_Hash')) { - include_once 'Crypt/Hash.php'; - } - - // include Crypt_Base so constants can be defined for setCryptoEngine() - if (!class_exists('Crypt_Base')) { - include_once 'Crypt/Base.php'; - } - - $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, - $this->channel_extended_data_type_codes, - array(60 => 'NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ'), - array(60 => 'NET_SSH2_MSG_USERAUTH_PK_OK'), - array(60 => 'NET_SSH2_MSG_USERAUTH_INFO_REQUEST', - 61 => 'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE'), - // RFC 4419 - diffie-hellman-group-exchange-sha{1,256} - array(30 => 'NET_SSH2_MSG_KEXDH_GEX_REQUEST_OLD', - 31 => 'NET_SSH2_MSG_KEXDH_GEX_GROUP', - 32 => 'NET_SSH2_MSG_KEXDH_GEX_INIT', - 33 => 'NET_SSH2_MSG_KEXDH_GEX_REPLY', - 34 => 'NET_SSH2_MSG_KEXDH_GEX_REQUEST') - ); - - if (is_resource($host)) { - $this->fsock = $host; - return; - } - - if (is_string($host)) { - $this->host = $host; - $this->port = $port; - $this->timeout = $timeout; - } - } - - /** - * PHP4 compatible Default Constructor. - * - * @see self::__construct() - * @param mixed $host - * @param int $port - * @param int $timeout - * @access public - */ - function Net_SSH2($host, $port = 22, $timeout = 10) - { - $this->__construct($host, $port, $timeout); - } - - /** - * Set Crypto Engine Mode - * - * Possible $engine values: - * CRYPT_MODE_INTERNAL, CRYPT_MODE_MCRYPT - * - * @param int $engine - * @access private - */ - function setCryptoEngine($engine) - { - $this->crypto_engine = $engine; - } - - /** - * Connect to an SSHv2 server - * - * @return bool - * @access private - */ - function _connect() - { - if ($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR) { - return false; - } - - $this->bitmap |= NET_SSH2_MASK_CONSTRUCTOR; - - $this->curTimeout = $this->timeout; - - $this->last_packet = strtok(microtime(), ' ') + strtok(''); // == microtime(true) in PHP5 - - if (!is_resource($this->fsock)) { - $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838 - $this->fsock = @fsockopen($this->host, $this->port, $errno, $errstr, $this->curTimeout); - if (!$this->fsock) { - $host = $this->host . ':' . $this->port; - user_error(rtrim("Cannot connect to $host. Error $errno. $errstr")); - return false; - } - $elapsed = strtok(microtime(), ' ') + strtok('') - $start; - - $this->curTimeout-= $elapsed; - - if ($this->curTimeout <= 0) { - $this->is_timeout = true; - return false; - } - } - - /* 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; - $temp = ''; - } - - if ($this->curTimeout) { - if ($this->curTimeout < 0) { - $this->is_timeout = true; - return false; - } - $read = array($this->fsock); - $write = $except = null; - $start = strtok(microtime(), ' ') + strtok(''); - $sec = floor($this->curTimeout); - $usec = 1000000 * ($this->curTimeout - $sec); - // on windows this returns a "Warning: Invalid CRT parameters detected" error - // the !count() is done as a workaround for <https://bugs.php.net/42682> - if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) { - $this->is_timeout = true; - return false; - } - $elapsed = strtok(microtime(), ' ') + strtok('') - $start; - $this->curTimeout-= $elapsed; - } - - $temp.= fgets($this->fsock, 255); - } - - if (feof($this->fsock)) { - user_error('Connection closed by server'); - return false; - } - - $this->identifier = $this->_generate_identifier(); - - 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 $matches[1] servers"); - return false; - } - - fputs($this->fsock, $this->identifier . "\r\n"); - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server'); - return false; - } - - if (ord($response[0]) != NET_SSH2_MSG_KEXINIT) { - user_error('Expected SSH_MSG_KEXINIT'); - return false; - } - - if (!$this->_key_exchange($response)) { - return false; - } - - $this->bitmap|= NET_SSH2_MASK_CONNECTED; - - return true; - } - - /** - * Generates the SSH identifier - * - * You should overwrite this method in your own class if you want to use another identifier - * - * @access protected - * @return string - */ - function _generate_identifier() - { - $identifier = 'SSH-2.0-phpseclib_1.0'; - - $ext = array(); - if (extension_loaded('openssl')) { - $ext[] = 'openssl'; - } elseif (extension_loaded('mcrypt')) { - $ext[] = 'mcrypt'; - } - - if (extension_loaded('gmp')) { - $ext[] = 'gmp'; - } elseif (extension_loaded('bcmath')) { - $ext[] = 'bcmath'; - } - - if (!empty($ext)) { - $identifier .= ' (' . implode(', ', $ext) . ')'; - } - - return $identifier; - } - - /** - * 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 - 'diffie-hellman-group-exchange-sha1', // RFC 4419 - 'diffie-hellman-group-exchange-sha256', // RFC 4419 - ); - - static $server_host_key_algorithms = array( - 'ssh-rsa', // RECOMMENDED sign Raw RSA Key - 'ssh-dss' // REQUIRED sign Raw DSS Key - ); - - static $encryption_algorithms = false; - if ($encryption_algorithms === false) { - $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 - - '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 - - '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) - - 'blowfish-ctr', // OPTIONAL Blowfish in SDCTR mode - - 'blowfish-cbc', // OPTIONAL Blowfish in CBC mode - - '3des-ctr', // RECOMMENDED Three-key 3DES in SDCTR mode - - '3des-cbc', // REQUIRED three-key 3DES in CBC mode - //'none' // OPTIONAL no encryption; NOT RECOMMENDED - ); - - if (extension_loaded('openssl') && !extension_loaded('mcrypt')) { - // OpenSSL does not support arcfour256 in any capacity and arcfour128 / arcfour support is limited to - // instances that do not use continuous buffers - $encryption_algorithms = array_diff( - $encryption_algorithms, - array('arcfour256', 'arcfour128', 'arcfour') - ); - } - - if (phpseclib_resolve_include_path('Crypt/RC4.php') === false) { - $encryption_algorithms = array_diff( - $encryption_algorithms, - array('arcfour256', 'arcfour128', 'arcfour') - ); - } - if (phpseclib_resolve_include_path('Crypt/Rijndael.php') === false) { - $encryption_algorithms = array_diff( - $encryption_algorithms, - array('aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc') - ); - } - if (phpseclib_resolve_include_path('Crypt/Twofish.php') === false) { - $encryption_algorithms = array_diff( - $encryption_algorithms, - array('twofish128-ctr', 'twofish192-ctr', 'twofish256-ctr', 'twofish128-cbc', 'twofish192-cbc', 'twofish256-cbc', 'twofish-cbc') - ); - } - if (phpseclib_resolve_include_path('Crypt/Blowfish.php') === false) { - $encryption_algorithms = array_diff( - $encryption_algorithms, - array('blowfish-ctr', 'blowfish-cbc') - ); - } - if (phpseclib_resolve_include_path('Crypt/TripleDES.php') === false) { - $encryption_algorithms = array_diff( - $encryption_algorithms, - array('3des-ctr', '3des-cbc') - ); - } - $encryption_algorithms = array_values($encryption_algorithms); - } - - $mac_algorithms = array( - // from <http://www.ietf.org/rfc/rfc6668.txt>: - 'hmac-sha2-256',// RECOMMENDED HMAC-SHA256 (digest length = key length = 32) - - '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') - )); - } - - 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 = crypt_random_string(16); - - $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 - // 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 = $this->_array_intersect_first($encryption_algorithms, $this->encryption_algorithms_server_to_client); - $decryptKeyLength = $this->_encryption_algorithm_to_key_size($decrypt); - if ($decryptKeyLength === null) { - user_error('No compatible server to client encryption algorithms found'); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - $encrypt = $this->_array_intersect_first($encryption_algorithms, $this->encryption_algorithms_client_to_server); - $encryptKeyLength = $this->_encryption_algorithm_to_key_size($encrypt); - if ($encryptKeyLength === null) { - user_error('No compatible client to server encryption algorithms found'); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - $keyLength = $decryptKeyLength > $encryptKeyLength ? $decryptKeyLength : $encryptKeyLength; - - // through diffie-hellman key exchange a symmetric key is obtained - $kex_algorithm = $this->_array_intersect_first($kex_algorithms, $this->kex_algorithms); - if ($kex_algorithm === false) { - user_error('No compatible key exchange algorithms found'); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - if (strpos($kex_algorithm, 'diffie-hellman-group-exchange') === 0) { - $dh_group_sizes_packed = pack( - 'NNN', - $this->kex_dh_group_size_min, - $this->kex_dh_group_size_preferred, - $this->kex_dh_group_size_max - ); - $packet = pack( - 'Ca*', - NET_SSH2_MSG_KEXDH_GEX_REQUEST, - $dh_group_sizes_packed - ); - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server'); - return false; - } - extract(unpack('Ctype', $this->_string_shift($response, 1))); - if ($type != NET_SSH2_MSG_KEXDH_GEX_GROUP) { - user_error('Expected SSH_MSG_KEX_DH_GEX_GROUP'); - return false; - } - - extract(unpack('NprimeLength', $this->_string_shift($response, 4))); - $primeBytes = $this->_string_shift($response, $primeLength); - $prime = new Math_BigInteger($primeBytes, -256); - - extract(unpack('NgLength', $this->_string_shift($response, 4))); - $gBytes = $this->_string_shift($response, $gLength); - $g = new Math_BigInteger($gBytes, -256); - - $exchange_hash_rfc4419 = pack( - 'a*Na*Na*', - $dh_group_sizes_packed, - $primeLength, - $primeBytes, - $gLength, - $gBytes - ); - - $clientKexInitMessage = NET_SSH2_MSG_KEXDH_GEX_INIT; - $serverKexReplyMessage = NET_SSH2_MSG_KEXDH_GEX_REPLY; - } else { - switch ($kex_algorithm) { - // see http://tools.ietf.org/html/rfc2409#section-6.2 and - // http://tools.ietf.org/html/rfc2412, appendex E - case 'diffie-hellman-group1-sha1': - $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' . - '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' . - '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' . - 'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF'; - break; - // see http://tools.ietf.org/html/rfc3526#section-3 - case 'diffie-hellman-group14-sha1': - $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' . - '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' . - '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' . - 'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' . - '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' . - '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' . - 'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' . - '3995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF'; - break; - } - // For both diffie-hellman-group1-sha1 and diffie-hellman-group14-sha1 - // the generator field element is 2 (decimal) and the hash function is sha1. - $g = new Math_BigInteger(2); - $prime = new Math_BigInteger($prime, 16); - $exchange_hash_rfc4419 = ''; - $clientKexInitMessage = NET_SSH2_MSG_KEXDH_INIT; - $serverKexReplyMessage = NET_SSH2_MSG_KEXDH_REPLY; - } - - switch ($kex_algorithm) { - case 'diffie-hellman-group-exchange-sha256': - $kexHash = new Crypt_Hash('sha256'); - break; - default: - $kexHash = new Crypt_Hash('sha1'); - } - - /* 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 */ - $one = new Math_BigInteger(1); - $keyLength = min($keyLength, $kexHash->getLength()); - $max = $one->bitwise_leftShift(16 * $keyLength); // 2 * 8 * $keyLength - $max = $max->subtract($one); - - $x = $one->random($one, $max); - $e = $g->modPow($x, $prime); - - $eBytes = $e->toBytes(true); - $data = pack('CNa*', $clientKexInitMessage, strlen($eBytes), $eBytes); - - if (!$this->_send_binary_packet($data)) { - user_error('Connection closed by server'); - return false; - } - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server'); - return false; - } - extract(unpack('Ctype', $this->_string_shift($response, 1))); - - if ($type != $serverKexReplyMessage) { - user_error('Expected SSH_MSG_KEXDH_REPLY'); - 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, $prime); - $keyBytes = $key->toBytes(true); - - $this->exchange_hash = pack( - 'Na*Na*Na*Na*Na*a*Na*Na*Na*', - strlen($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, - $exchange_hash_rfc4419, - strlen($eBytes), - $eBytes, - strlen($fBytes), - $fBytes, - strlen($keyBytes), - $keyBytes - ); - - $this->exchange_hash = $kexHash->hash($this->exchange_hash); - - if ($this->session_id === false) { - $this->session_id = $this->exchange_hash; - } - - $server_host_key_algorithm = $this->_array_intersect_first($server_host_key_algorithms, $this->server_host_key_algorithms); - if ($server_host_key_algorithm === false) { - user_error('No compatible server host key algorithms found'); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - if ($public_key_format != $server_host_key_algorithm || $this->signature_format != $server_host_key_algorithm) { - user_error('Server Host Key Algorithm Mismatch'); - 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'); - return false; - } - - extract(unpack('Ctype', $this->_string_shift($response, 1))); - - if ($type != NET_SSH2_MSG_NEWKEYS) { - user_error('Expected SSH_MSG_NEWKEYS'); - return false; - } - - switch ($encrypt) { - case '3des-cbc': - if (!class_exists('Crypt_TripleDES')) { - include_once 'Crypt/TripleDES.php'; - } - $this->encrypt = new Crypt_TripleDES(); - // $this->encrypt_block_size = 64 / 8 == the default - break; - case '3des-ctr': - if (!class_exists('Crypt_TripleDES')) { - include_once 'Crypt/TripleDES.php'; - } - $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': - if (!class_exists('Crypt_Rijndael')) { - include_once 'Crypt/Rijndael.php'; - } - $this->encrypt = new Crypt_Rijndael(); - $this->encrypt_block_size = 16; // eg. 128 / 8 - break; - case 'aes256-ctr': - case 'aes192-ctr': - case 'aes128-ctr': - if (!class_exists('Crypt_Rijndael')) { - include_once 'Crypt/Rijndael.php'; - } - $this->encrypt = new Crypt_Rijndael(CRYPT_RIJNDAEL_MODE_CTR); - $this->encrypt_block_size = 16; // eg. 128 / 8 - break; - case 'blowfish-cbc': - if (!class_exists('Crypt_Blowfish')) { - include_once 'Crypt/Blowfish.php'; - } - $this->encrypt = new Crypt_Blowfish(); - $this->encrypt_block_size = 8; - break; - case 'blowfish-ctr': - if (!class_exists('Crypt_Blowfish')) { - include_once 'Crypt/Blowfish.php'; - } - $this->encrypt = new Crypt_Blowfish(CRYPT_BLOWFISH_MODE_CTR); - $this->encrypt_block_size = 8; - break; - case 'twofish128-cbc': - case 'twofish192-cbc': - case 'twofish256-cbc': - case 'twofish-cbc': - if (!class_exists('Crypt_Twofish')) { - include_once 'Crypt/Twofish.php'; - } - $this->encrypt = new Crypt_Twofish(); - $this->encrypt_block_size = 16; - break; - case 'twofish128-ctr': - case 'twofish192-ctr': - case 'twofish256-ctr': - if (!class_exists('Crypt_Twofish')) { - include_once 'Crypt/Twofish.php'; - } - $this->encrypt = new Crypt_Twofish(CRYPT_TWOFISH_MODE_CTR); - $this->encrypt_block_size = 16; - break; - case 'arcfour': - case 'arcfour128': - case 'arcfour256': - if (!class_exists('Crypt_RC4')) { - include_once 'Crypt/RC4.php'; - } - $this->encrypt = new Crypt_RC4(); - break; - case 'none': - //$this->encrypt = new Crypt_Null(); - } - - switch ($decrypt) { - case '3des-cbc': - if (!class_exists('Crypt_TripleDES')) { - include_once 'Crypt/TripleDES.php'; - } - $this->decrypt = new Crypt_TripleDES(); - break; - case '3des-ctr': - if (!class_exists('Crypt_TripleDES')) { - include_once 'Crypt/TripleDES.php'; - } - $this->decrypt = new Crypt_TripleDES(CRYPT_DES_MODE_CTR); - break; - case 'aes256-cbc': - case 'aes192-cbc': - case 'aes128-cbc': - if (!class_exists('Crypt_Rijndael')) { - include_once 'Crypt/Rijndael.php'; - } - $this->decrypt = new Crypt_Rijndael(); - $this->decrypt_block_size = 16; - break; - case 'aes256-ctr': - case 'aes192-ctr': - case 'aes128-ctr': - if (!class_exists('Crypt_Rijndael')) { - include_once 'Crypt/Rijndael.php'; - } - $this->decrypt = new Crypt_Rijndael(CRYPT_RIJNDAEL_MODE_CTR); - $this->decrypt_block_size = 16; - break; - case 'blowfish-cbc': - if (!class_exists('Crypt_Blowfish')) { - include_once 'Crypt/Blowfish.php'; - } - $this->decrypt = new Crypt_Blowfish(); - $this->decrypt_block_size = 8; - break; - case 'blowfish-ctr': - if (!class_exists('Crypt_Blowfish')) { - include_once 'Crypt/Blowfish.php'; - } - $this->decrypt = new Crypt_Blowfish(CRYPT_BLOWFISH_MODE_CTR); - $this->decrypt_block_size = 8; - break; - case 'twofish128-cbc': - case 'twofish192-cbc': - case 'twofish256-cbc': - case 'twofish-cbc': - if (!class_exists('Crypt_Twofish')) { - include_once 'Crypt/Twofish.php'; - } - $this->decrypt = new Crypt_Twofish(); - $this->decrypt_block_size = 16; - break; - case 'twofish128-ctr': - case 'twofish192-ctr': - case 'twofish256-ctr': - if (!class_exists('Crypt_Twofish')) { - include_once 'Crypt/Twofish.php'; - } - $this->decrypt = new Crypt_Twofish(CRYPT_TWOFISH_MODE_CTR); - $this->decrypt_block_size = 16; - break; - case 'arcfour': - case 'arcfour128': - case 'arcfour256': - if (!class_exists('Crypt_RC4')) { - include_once 'Crypt/RC4.php'; - } - $this->decrypt = new Crypt_RC4(); - break; - case 'none': - //$this->decrypt = new Crypt_Null(); - } - - $keyBytes = pack('Na*', strlen($keyBytes), $keyBytes); - - if ($this->encrypt) { - if ($this->crypto_engine) { - $this->encrypt->setEngine($this->crypto_engine); - } - $this->encrypt->enableContinuousBuffer(); - $this->encrypt->disablePadding(); - - $iv = $kexHash->hash($keyBytes . $this->exchange_hash . 'A' . $this->session_id); - while ($this->encrypt_block_size > strlen($iv)) { - $iv.= $kexHash->hash($keyBytes . $this->exchange_hash . $iv); - } - $this->encrypt->setIV(substr($iv, 0, $this->encrypt_block_size)); - - $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'C' . $this->session_id); - while ($encryptKeyLength > strlen($key)) { - $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key); - } - $this->encrypt->setKey(substr($key, 0, $encryptKeyLength)); - } - - if ($this->decrypt) { - if ($this->crypto_engine) { - $this->decrypt->setEngine($this->crypto_engine); - } - $this->decrypt->enableContinuousBuffer(); - $this->decrypt->disablePadding(); - - $iv = $kexHash->hash($keyBytes . $this->exchange_hash . 'B' . $this->session_id); - while ($this->decrypt_block_size > strlen($iv)) { - $iv.= $kexHash->hash($keyBytes . $this->exchange_hash . $iv); - } - $this->decrypt->setIV(substr($iv, 0, $this->decrypt_block_size)); - - $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'D' . $this->session_id); - while ($decryptKeyLength > strlen($key)) { - $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $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)); - } - - $mac_algorithm = $this->_array_intersect_first($mac_algorithms, $this->mac_algorithms_client_to_server); - if ($mac_algorithm === false) { - user_error('No compatible client to server message authentication algorithms found'); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - $createKeyLength = 0; // ie. $mac_algorithm == 'none' - switch ($mac_algorithm) { - case 'hmac-sha2-256': - $this->hmac_create = new Crypt_Hash('sha256'); - $createKeyLength = 32; - break; - 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; - } - - $mac_algorithm = $this->_array_intersect_first($mac_algorithms, $this->mac_algorithms_server_to_client); - if ($mac_algorithm === false) { - user_error('No compatible server to client message authentication algorithms found'); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - $checkKeyLength = 0; - $this->hmac_size = 0; - switch ($mac_algorithm) { - case 'hmac-sha2-256': - $this->hmac_check = new Crypt_Hash('sha256'); - $checkKeyLength = 32; - $this->hmac_size = 32; - break; - 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 = $kexHash->hash($keyBytes . $this->exchange_hash . 'E' . $this->session_id); - while ($createKeyLength > strlen($key)) { - $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key); - } - $this->hmac_create->setKey(substr($key, 0, $createKeyLength)); - - $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'F' . $this->session_id); - while ($checkKeyLength > strlen($key)) { - $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key); - } - $this->hmac_check->setKey(substr($key, 0, $checkKeyLength)); - - $compression_algorithm = $this->_array_intersect_first($compression_algorithms, $this->compression_algorithms_server_to_client); - if ($compression_algorithm === false) { - user_error('No compatible server to client compression algorithms found'); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - $this->decompress = $compression_algorithm == 'zlib'; - - $compression_algorithm = $this->_array_intersect_first($compression_algorithms, $this->compression_algorithms_client_to_server); - if ($compression_algorithm === false) { - user_error('No compatible client to server compression algorithms found'); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - $this->compress = $compression_algorithm == 'zlib'; - - return true; - } - - /** - * Maps an encryption algorithm name to the number of key bytes. - * - * @param string $algorithm Name of the encryption algorithm - * @return int|null Number of bytes as an integer or null for unknown - * @access private - */ - function _encryption_algorithm_to_key_size($algorithm) - { - switch ($algorithm) { - case 'none': - return 0; - case 'aes128-cbc': - case 'aes128-ctr': - case 'arcfour': - case 'arcfour128': - case 'blowfish-cbc': - case 'blowfish-ctr': - case 'twofish128-cbc': - case 'twofish128-ctr': - return 16; - case '3des-cbc': - case '3des-ctr': - case 'aes192-cbc': - case 'aes192-ctr': - case 'twofish192-cbc': - case 'twofish192-ctr': - return 24; - case 'aes256-cbc': - case 'aes256-ctr': - case 'arcfour256': - case 'twofish-cbc': - case 'twofish256-cbc': - case 'twofish256-ctr': - return 32; - } - return null; - } - - /** - * Login - * - * The $password parameter can be a plaintext password, a Crypt_RSA object or an array - * - * @param string $username - * @param mixed $password - * @param mixed $... - * @return bool - * @see self::_login() - * @access public - */ - function login($username) - { - $args = func_get_args(); - return call_user_func_array(array(&$this, '_login'), $args); - } - - /** - * Login Helper - * - * @param string $username - * @param mixed $password - * @param mixed $... - * @return bool - * @see self::_login_helper() - * @access private - */ - function _login($username) - { - if (!($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR)) { - if (!$this->_connect()) { - return false; - } - } - - $args = array_slice(func_get_args(), 1); - if (empty($args)) { - return $this->_login_helper($username); - } - - foreach ($args as $arg) { - if ($this->_login_helper($username, $arg)) { - return true; - } - } - return false; - } - - /** - * Login Helper - * - * @param string $username - * @param string $password - * @return bool - * @access private - * @internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis} - * by sending dummy SSH_MSG_IGNORE messages. - */ - function _login_helper($username, $password = null) - { - if (!($this->bitmap & NET_SSH2_MASK_CONNECTED)) { - return false; - } - - if (!($this->bitmap & NET_SSH2_MASK_LOGIN_REQ)) { - $packet = pack( - 'CNa*', - NET_SSH2_MSG_SERVICE_REQUEST, - strlen('ssh-userauth'), - 'ssh-userauth' - ); - - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server'); - return false; - } - - extract(unpack('Ctype', $this->_string_shift($response, 1))); - - if ($type != NET_SSH2_MSG_SERVICE_ACCEPT) { - user_error('Expected SSH_MSG_SERVICE_ACCEPT'); - return false; - } - $this->bitmap |= NET_SSH2_MASK_LOGIN_REQ; - } - - if (strlen($this->last_interactive_response)) { - return !is_string($password) && !is_array($password) ? false : $this->_keyboard_interactive_process($password); - } - - // although PHP5's get_class() preserves the case, PHP4's does not - if (is_object($password)) { - switch (strtolower(get_class($password))) { - case 'crypt_rsa': - return $this->_privatekey_login($username, $password); - case 'system_ssh_agent': - return $this->_ssh_agent_login($username, $password); - } - } - - if (is_array($password)) { - if ($this->_keyboard_interactive_login($username, $password)) { - $this->bitmap |= NET_SSH2_MASK_LOGIN; - return true; - } - return false; - } - - if (!isset($password)) { - $packet = pack( - 'CNa*Na*Na*', - NET_SSH2_MSG_USERAUTH_REQUEST, - strlen($username), - $username, - strlen('ssh-connection'), - 'ssh-connection', - strlen('none'), - 'none' - ); - - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server'); - return false; - } - - extract(unpack('Ctype', $this->_string_shift($response, 1))); - - switch ($type) { - case NET_SSH2_MSG_USERAUTH_SUCCESS: - $this->bitmap |= NET_SSH2_MASK_LOGIN; - return true; - //case NET_SSH2_MSG_USERAUTH_FAILURE: - default: - return false; - } - } - - $packet = pack( - 'CNa*Na*Na*CNa*', - NET_SSH2_MSG_USERAUTH_REQUEST, - strlen($username), - $username, - strlen('ssh-connection'), - 'ssh-connection', - strlen('password'), - 'password', - 0, - strlen($password), - $password - ); - - // remove the username and password from the logged packet - if (!defined('NET_SSH2_LOGGING')) { - $logged = null; - } else { - $logged = pack( - 'CNa*Na*Na*CNa*', - NET_SSH2_MSG_USERAUTH_REQUEST, - strlen('username'), - 'username', - strlen('ssh-connection'), - 'ssh-connection', - strlen('password'), - 'password', - 0, - strlen('password'), - 'password' - ); - } - - if (!$this->_send_binary_packet($packet, $logged)) { - return false; - } - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server'); - 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: - // can we use keyboard-interactive authentication? if not then either the login is bad or the server employees - // multi-factor authentication - extract(unpack('Nlength', $this->_string_shift($response, 4))); - $auth_methods = explode(',', $this->_string_shift($response, $length)); - extract(unpack('Cpartial_success', $this->_string_shift($response, 1))); - $partial_success = $partial_success != 0; - - if (!$partial_success && in_array('keyboard-interactive', $auth_methods)) { - if ($this->_keyboard_interactive_login($username, $password)) { - $this->bitmap |= NET_SSH2_MASK_LOGIN; - return true; - } - return false; - } - return false; - case NET_SSH2_MSG_USERAUTH_SUCCESS: - $this->bitmap |= NET_SSH2_MASK_LOGIN; - return true; - } - - return false; - } - - /** - * Login via keyboard-interactive authentication - * - * See {@link http://tools.ietf.org/html/rfc4256 RFC4256} for details. This is not a full-featured keyboard-interactive authenticator. - * - * @param string $username - * @param string $password - * @return bool - * @access private - */ - function _keyboard_interactive_login($username, $password) - { - $packet = pack( - 'CNa*Na*Na*Na*Na*', - NET_SSH2_MSG_USERAUTH_REQUEST, - strlen($username), - $username, - strlen('ssh-connection'), - 'ssh-connection', - strlen('keyboard-interactive'), - 'keyboard-interactive', - 0, - '', - 0, - '' - ); - - if (!$this->_send_binary_packet($packet)) { - return false; - } - - return $this->_keyboard_interactive_process($password); - } - - /** - * Handle the keyboard-interactive requests / responses. - * - * @param string $responses... - * @return bool - * @access private - */ - function _keyboard_interactive_process() - { - $responses = func_get_args(); - - if (strlen($this->last_interactive_response)) { - $response = $this->last_interactive_response; - } else { - $orig = $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server'); - return false; - } - } - - extract(unpack('Ctype', $this->_string_shift($response, 1))); - - switch ($type) { - case NET_SSH2_MSG_USERAUTH_INFO_REQUEST: - extract(unpack('Nlength', $this->_string_shift($response, 4))); - $this->_string_shift($response, $length); // name; may be empty - extract(unpack('Nlength', $this->_string_shift($response, 4))); - $this->_string_shift($response, $length); // instruction; may be empty - extract(unpack('Nlength', $this->_string_shift($response, 4))); - $this->_string_shift($response, $length); // language tag; may be empty - extract(unpack('Nnum_prompts', $this->_string_shift($response, 4))); - - for ($i = 0; $i < count($responses); $i++) { - if (is_array($responses[$i])) { - foreach ($responses[$i] as $key => $value) { - $this->keyboard_requests_responses[$key] = $value; - } - unset($responses[$i]); - } - } - $responses = array_values($responses); - - if (isset($this->keyboard_requests_responses)) { - for ($i = 0; $i < $num_prompts; $i++) { - extract(unpack('Nlength', $this->_string_shift($response, 4))); - // prompt - ie. "Password: "; must not be empty - $prompt = $this->_string_shift($response, $length); - //$echo = $this->_string_shift($response) != chr(0); - foreach ($this->keyboard_requests_responses as $key => $value) { - if (substr($prompt, 0, strlen($key)) == $key) { - $responses[] = $value; - break; - } - } - } - } - - // see http://tools.ietf.org/html/rfc4256#section-3.2 - if (strlen($this->last_interactive_response)) { - $this->last_interactive_response = ''; - } elseif (defined('NET_SSH2_LOGGING')) { - $this->message_number_log[count($this->message_number_log) - 1] = str_replace( - 'UNKNOWN', - 'NET_SSH2_MSG_USERAUTH_INFO_REQUEST', - $this->message_number_log[count($this->message_number_log) - 1] - ); - } - - if (!count($responses) && $num_prompts) { - $this->last_interactive_response = $orig; - return false; - } - - /* - After obtaining the requested information from the user, the client - MUST respond with an SSH_MSG_USERAUTH_INFO_RESPONSE message. - */ - // see http://tools.ietf.org/html/rfc4256#section-3.4 - $packet = $logged = pack('CN', NET_SSH2_MSG_USERAUTH_INFO_RESPONSE, count($responses)); - for ($i = 0; $i < count($responses); $i++) { - $packet.= pack('Na*', strlen($responses[$i]), $responses[$i]); - $logged.= pack('Na*', strlen('dummy-answer'), 'dummy-answer'); - } - - if (!$this->_send_binary_packet($packet, $logged)) { - return false; - } - - if (defined('NET_SSH2_LOGGING') && NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) { - $this->message_number_log[count($this->message_number_log) - 1] = str_replace( - 'UNKNOWN', - 'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE', - $this->message_number_log[count($this->message_number_log) - 1] - ); - } - - /* - After receiving the response, the server MUST send either an - SSH_MSG_USERAUTH_SUCCESS, SSH_MSG_USERAUTH_FAILURE, or another - SSH_MSG_USERAUTH_INFO_REQUEST message. - */ - // maybe phpseclib should force close the connection after x request / responses? unless something like that is done - // there could be an infinite loop of request / responses. - return $this->_keyboard_interactive_process(); - case NET_SSH2_MSG_USERAUTH_SUCCESS: - return true; - case NET_SSH2_MSG_USERAUTH_FAILURE: - return false; - } - - return false; - } - - /** - * Login with an ssh-agent provided key - * - * @param string $username - * @param System_SSH_Agent $agent - * @return bool - * @access private - */ - function _ssh_agent_login($username, $agent) - { - $this->agent = $agent; - $keys = $agent->requestIdentities(); - foreach ($keys as $key) { - if ($this->_privatekey_login($username, $key)) { - return true; - } - } - - return false; - } - - /** - * Login with an RSA private key - * - * @param string $username - * @param Crypt_RSA $password - * @return bool - * @access private - * @internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis} - * by sending dummy SSH_MSG_IGNORE messages. - */ - function _privatekey_login($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'); - 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 false; - 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') && NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) { - $this->message_number_log[count($this->message_number_log) - 1] = str_replace( - 'UNKNOWN', - 'NET_SSH2_MSG_USERAUTH_PK_OK', - $this->message_number_log[count($this->message_number_log) - 1] - ); - } - } - - $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'); - 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 employs multi-factor authentication - return false; - case NET_SSH2_MSG_USERAUTH_SUCCESS: - $this->bitmap |= NET_SSH2_MASK_LOGIN; - return true; - } - - return false; - } - - /** - * 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 $timeout - * @access public - */ - function setTimeout($timeout) - { - $this->timeout = $this->curTimeout = $timeout; - } - - /** - * Get the output from stdError - * - * @access public - */ - function getStdError() - { - return $this->stdErrorLog; - } - - /** - * Execute Command - * - * If $callback is set to false then Net_SSH2::_get_channel_packet(NET_SSH2_CHANNEL_EXEC) will need to be called manually. - * In all likelihood, this is not a feature you want to be taking advantage of. - * - * @param string $command - * @param Callback $callback - * @return string - * @access public - */ - function exec($command, $callback = null) - { - $this->curTimeout = $this->timeout; - $this->is_timeout = false; - $this->stdErrorLog = ''; - - if (!($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 2GB, the max size. technically, it should probably be decremented, but, - // honestly, if you're transferring more than 2GB, you probably shouldn't be using phpseclib, anyway. - // see http://tools.ietf.org/html/rfc4254#section-5.2 for more info - $this->window_size_server_to_client[NET_SSH2_CHANNEL_EXEC] = $this->window_size; - // 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_server_to_client[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; - } - - if ($this->request_pty === true) { - $terminal_modes = pack('C', NET_SSH2_TTY_OP_END); - $packet = pack( - 'CNNa*CNa*N5a*', - NET_SSH2_MSG_CHANNEL_REQUEST, - $this->server_channels[NET_SSH2_CHANNEL_EXEC], - strlen('pty-req'), - 'pty-req', - 1, - strlen('vt100'), - 'vt100', - $this->windowColumns, - $this->windowRows, - 0, - 0, - strlen($terminal_modes), - $terminal_modes - ); - - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server'); - return false; - } - - list(, $type) = unpack('C', $this->_string_shift($response, 1)); - - switch ($type) { - case NET_SSH2_MSG_CHANNEL_SUCCESS: - break; - case NET_SSH2_MSG_CHANNEL_FAILURE: - default: - user_error('Unable to request pseudo-terminal'); - return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); - } - $this->in_request_pty_exec = true; - } - - // 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; - } - - $this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_DATA; - - if ($callback === false || $this->in_request_pty_exec) { - return true; - } - - $output = ''; - while (true) { - $temp = $this->_get_channel_packet(NET_SSH2_CHANNEL_EXEC); - switch (true) { - case $temp === true: - return is_callable($callback) ? true : $output; - case $temp === false: - return false; - default: - if (is_callable($callback)) { - if (call_user_func($callback, $temp) === true) { - $this->_close_channel(NET_SSH2_CHANNEL_EXEC); - return true; - } - } else { - $output.= $temp; - } - } - } - } - - /** - * Creates an interactive shell - * - * @see self::read() - * @see self::write() - * @return bool - * @access private - */ - function _initShell() - { - if ($this->in_request_pty_exec === true) { - return true; - } - - $this->window_size_server_to_client[NET_SSH2_CHANNEL_SHELL] = $this->window_size; - $packet_size = 0x4000; - - $packet = pack( - 'CNa*N3', - NET_SSH2_MSG_CHANNEL_OPEN, - strlen('session'), - 'session', - NET_SSH2_CHANNEL_SHELL, - $this->window_size_server_to_client[NET_SSH2_CHANNEL_SHELL], - $packet_size - ); - - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_OPEN; - - $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SHELL); - if ($response === false) { - return false; - } - - $terminal_modes = pack('C', NET_SSH2_TTY_OP_END); - $packet = pack( - 'CNNa*CNa*N5a*', - NET_SSH2_MSG_CHANNEL_REQUEST, - $this->server_channels[NET_SSH2_CHANNEL_SHELL], - strlen('pty-req'), - 'pty-req', - 1, - strlen('vt100'), - 'vt100', - $this->windowColumns, - $this->windowRows, - 0, - 0, - strlen($terminal_modes), - $terminal_modes - ); - - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server'); - return false; - } - - list(, $type) = unpack('C', $this->_string_shift($response, 1)); - - switch ($type) { - case NET_SSH2_MSG_CHANNEL_SUCCESS: - // if a pty can't be opened maybe commands can still be executed - case NET_SSH2_MSG_CHANNEL_FAILURE: - break; - default: - user_error('Unable to request pseudo-terminal'); - return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); - } - - $packet = pack( - 'CNNa*C', - NET_SSH2_MSG_CHANNEL_REQUEST, - $this->server_channels[NET_SSH2_CHANNEL_SHELL], - strlen('shell'), - 'shell', - 1 - ); - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_REQUEST; - - $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SHELL); - if ($response === false) { - return false; - } - - $this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_DATA; - - $this->bitmap |= NET_SSH2_MASK_SHELL; - - return true; - } - - /** - * Return the channel to be used with read() / write() - * - * @see self::read() - * @see self::write() - * @return int - * @access public - */ - function _get_interactive_channel() - { - switch (true) { - case $this->in_subsystem: - return NET_SSH2_CHANNEL_SUBSYSTEM; - case $this->in_request_pty_exec: - return NET_SSH2_CHANNEL_EXEC; - default: - return NET_SSH2_CHANNEL_SHELL; - } - } - - /** - * Return an available open channel - * - * @return int - * @access public - */ - function _get_open_channel() - { - $channel = NET_SSH2_CHANNEL_EXEC; - do { - if (isset($this->channel_status[$channel]) && $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_OPEN) { - return $channel; - } - } while ($channel++ < NET_SSH2_CHANNEL_SUBSYSTEM); - - return false; - } - - /** - * Returns the output of an interactive shell - * - * Returns when there's a match for $expect, which can take the form of a string literal or, - * if $mode == NET_SSH2_READ_REGEX, a regular expression. - * - * @see self::write() - * @param string $expect - * @param int $mode - * @return string - * @access public - */ - function read($expect = '', $mode = NET_SSH2_READ_SIMPLE) - { - $this->curTimeout = $this->timeout; - $this->is_timeout = false; - - if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) { - user_error('Operation disallowed prior to login()'); - return false; - } - - if (!($this->bitmap & NET_SSH2_MASK_SHELL) && !$this->_initShell()) { - user_error('Unable to initiate an interactive shell session'); - return false; - } - - $channel = $this->_get_interactive_channel(); - - $match = $expect; - while (true) { - if ($mode == NET_SSH2_READ_REGEX) { - preg_match($expect, substr($this->interactiveBuffer, -1024), $matches); - $match = isset($matches[0]) ? $matches[0] : ''; - } - $pos = strlen($match) ? strpos($this->interactiveBuffer, $match) : false; - if ($pos !== false) { - return $this->_string_shift($this->interactiveBuffer, $pos + strlen($match)); - } - $response = $this->_get_channel_packet($channel); - if (is_bool($response)) { - $this->in_request_pty_exec = false; - return $response ? $this->_string_shift($this->interactiveBuffer, strlen($this->interactiveBuffer)) : false; - } - - $this->interactiveBuffer.= $response; - } - } - - /** - * Inputs a command into an interactive shell. - * - * @see self::read() - * @param string $cmd - * @return bool - * @access public - */ - function write($cmd) - { - if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) { - user_error('Operation disallowed prior to login()'); - return false; - } - - if (!($this->bitmap & NET_SSH2_MASK_SHELL) && !$this->_initShell()) { - user_error('Unable to initiate an interactive shell session'); - return false; - } - - return $this->_send_channel_packet($this->_get_interactive_channel(), $cmd); - } - - /** - * Start a subsystem. - * - * Right now only one subsystem at a time is supported. To support multiple subsystem's stopSubsystem() could accept - * a string that contained the name of the subsystem, but at that point, only one subsystem of each type could be opened. - * To support multiple subsystem's of the same name maybe it'd be best if startSubsystem() generated a new channel id and - * returns that and then that that was passed into stopSubsystem() but that'll be saved for a future date and implemented - * if there's sufficient demand for such a feature. - * - * @see self::stopSubsystem() - * @param string $subsystem - * @return bool - * @access public - */ - function startSubsystem($subsystem) - { - $this->window_size_server_to_client[NET_SSH2_CHANNEL_SUBSYSTEM] = $this->window_size; - - $packet = pack( - 'CNa*N3', - NET_SSH2_MSG_CHANNEL_OPEN, - strlen('session'), - 'session', - NET_SSH2_CHANNEL_SUBSYSTEM, - $this->window_size, - 0x4000 - ); - - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $this->channel_status[NET_SSH2_CHANNEL_SUBSYSTEM] = NET_SSH2_MSG_CHANNEL_OPEN; - - $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SUBSYSTEM); - if ($response === false) { - return false; - } - - $packet = pack( - 'CNNa*CNa*', - NET_SSH2_MSG_CHANNEL_REQUEST, - $this->server_channels[NET_SSH2_CHANNEL_SUBSYSTEM], - strlen('subsystem'), - 'subsystem', - 1, - strlen($subsystem), - $subsystem - ); - if (!$this->_send_binary_packet($packet)) { - return false; - } - - $this->channel_status[NET_SSH2_CHANNEL_SUBSYSTEM] = NET_SSH2_MSG_CHANNEL_REQUEST; - - $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SUBSYSTEM); - - if ($response === false) { - return false; - } - - $this->channel_status[NET_SSH2_CHANNEL_SUBSYSTEM] = NET_SSH2_MSG_CHANNEL_DATA; - - $this->bitmap |= NET_SSH2_MASK_SHELL; - $this->in_subsystem = true; - - return true; - } - - /** - * Stops a subsystem. - * - * @see self::startSubsystem() - * @return bool - * @access public - */ - function stopSubsystem() - { - $this->in_subsystem = false; - $this->_close_channel(NET_SSH2_CHANNEL_SUBSYSTEM); - return true; - } - - /** - * Closes a channel - * - * If read() timed out you might want to just close the channel and have it auto-restart on the next read() call - * - * @access public - */ - function reset() - { - $this->_close_channel($this->_get_interactive_channel()); - } - - /** - * Is timeout? - * - * Did exec() or read() return because they timed out or because they encountered the end? - * - * @access public - */ - function isTimeout() - { - return $this->is_timeout; - } - - /** - * Disconnect - * - * @access public - */ - function disconnect() - { - $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); - if (isset($this->realtime_log_file) && is_resource($this->realtime_log_file)) { - fclose($this->realtime_log_file); - } - } - - /** - * 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() - { - $this->disconnect(); - } - - /** - * Is the connection still active? - * - * @return bool - * @access public - */ - function isConnected() - { - return (bool) ($this->bitmap & NET_SSH2_MASK_CONNECTED); - } - - /** - * Have you successfully been logged in? - * - * @return bool - * @access public - */ - function isAuthenticated() - { - return (bool) ($this->bitmap & NET_SSH2_MASK_LOGIN); - } - - /** - * Gets Binary Packets - * - * See '6. Binary Packet Protocol' of rfc4253 for more info. - * - * @see self::_send_binary_packet() - * @return string - * @access private - */ - function _get_binary_packet() - { - if (!is_resource($this->fsock) || feof($this->fsock)) { - user_error('Connection closed prematurely'); - $this->bitmap = 0; - return false; - } - - $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838 - $raw = fread($this->fsock, $this->decrypt_block_size); - - if (!strlen($raw)) { - return ''; - } - - if ($this->decrypt !== false) { - $raw = $this->decrypt->decrypt($raw); - } - if ($raw === false) { - user_error('Unable to decrypt content'); - return false; - } - - extract(unpack('Npacket_length/Cpadding_length', $this->_string_shift($raw, 5))); - - $remaining_length = $packet_length + 4 - $this->decrypt_block_size; - - // quoting <http://tools.ietf.org/html/rfc4253#section-6.1>, - // "implementations SHOULD check that the packet length is reasonable" - // PuTTY uses 0x9000 as the actual max packet size and so to shall we - if ($remaining_length < -$this->decrypt_block_size || $remaining_length > 0x9000 || $remaining_length % $this->decrypt_block_size != 0) { - user_error('Invalid size'); - return false; - } - - $buffer = ''; - while ($remaining_length > 0) { - $temp = fread($this->fsock, $remaining_length); - if ($temp === false || feof($this->fsock)) { - user_error('Error reading from socket'); - $this->bitmap = 0; - return false; - } - $buffer.= $temp; - $remaining_length-= strlen($temp); - } - $stop = strtok(microtime(), ' ') + strtok(''); - if (strlen($buffer)) { - $raw.= $this->decrypt !== false ? $this->decrypt->decrypt($buffer) : $buffer; - } - - $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 === false || strlen($hmac) != $this->hmac_size) { - user_error('Error reading socket'); - $this->bitmap = 0; - return false; - } elseif ($hmac != $this->hmac_check->hash(pack('NNCa*', $this->get_seq_no, $packet_length, $padding_length, $payload . $padding))) { - user_error('Invalid HMAC'); - return false; - } - } - - //if ($this->decompress) { - // $payload = gzinflate(substr($payload, 2)); - //} - - $this->get_seq_no++; - - if (defined('NET_SSH2_LOGGING')) { - $current = strtok(microtime(), ' ') + strtok(''); - $message_number = isset($this->message_numbers[ord($payload[0])]) ? $this->message_numbers[ord($payload[0])] : 'UNKNOWN (' . ord($payload[0]) . ')'; - $message_number = '<- ' . $message_number . - ' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($stop - $start, 4) . 's)'; - $this->_append_log($message_number, $payload); - $this->last_packet = $current; - } - - return $this->_filter($payload); - } - - /** - * Filter Binary Packets - * - * Because some binary packets need to be ignored... - * - * @see self::_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->bitmap = 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->bitmap = 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_CONNECTED) && !($this->bitmap & NET_SSH2_MASK_LOGIN) && ord($payload[0]) == NET_SSH2_MSG_USERAUTH_BANNER) { - $this->_string_shift($payload, 1); - extract(unpack('Nlength', $this->_string_shift($payload, 4))); - $this->banner_message = utf8_decode($this->_string_shift($payload, $length)); - $payload = $this->_get_binary_packet(); - } - - // only called when we've already logged in - if (($this->bitmap & NET_SSH2_MASK_CONNECTED) && ($this->bitmap & NET_SSH2_MASK_LOGIN)) { - switch (ord($payload[0])) { - case NET_SSH2_MSG_GLOBAL_REQUEST: // see http://tools.ietf.org/html/rfc4254#section-4 - extract(unpack('Nlength', $this->_string_shift($payload, 4))); - $this->errors[] = 'SSH_MSG_GLOBAL_REQUEST: ' . $this->_string_shift($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('Nlength', $this->_string_shift($payload, 4))); - $data = $this->_string_shift($payload, $length); - extract(unpack('Nserver_channel', $this->_string_shift($payload, 4))); - switch ($data) { - case 'auth-agent': - case 'auth-agent@openssh.com': - if (isset($this->agent)) { - $new_channel = NET_SSH2_CHANNEL_AGENT_FORWARD; - - extract(unpack('Nremote_window_size', $this->_string_shift($payload, 4))); - extract(unpack('Nremote_maximum_packet_size', $this->_string_shift($payload, 4))); - - $this->packet_size_client_to_server[$new_channel] = $remote_window_size; - $this->window_size_server_to_client[$new_channel] = $remote_maximum_packet_size; - $this->window_size_client_to_server[$new_channel] = $this->window_size; - - $packet_size = 0x4000; - - $packet = pack( - 'CN4', - NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, - $server_channel, - $new_channel, - $packet_size, - $packet_size - ); - - $this->server_channels[$new_channel] = $server_channel; - $this->channel_status[$new_channel] = NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION; - if (!$this->_send_binary_packet($packet)) { - return false; - } - } - break; - default: - $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: - $this->_string_shift($payload, 1); - extract(unpack('Nchannel', $this->_string_shift($payload, 4))); - extract(unpack('Nwindow_size', $this->_string_shift($payload, 4))); - $this->window_size_client_to_server[$channel]+= $window_size; - - $payload = ($this->bitmap & NET_SSH2_MASK_WINDOW_ADJUST) ? true : $this->_get_binary_packet(); - } - } - - return $payload; - } - - /** - * Enable Quiet Mode - * - * Suppress stderr from output - * - * @access public - */ - function enableQuietMode() - { - $this->quiet_mode = true; - } - - /** - * Disable Quiet Mode - * - * Show stderr in output - * - * @access public - */ - function disableQuietMode() - { - $this->quiet_mode = false; - } - - /** - * Returns whether Quiet Mode is enabled or not - * - * @see self::enableQuietMode() - * @see self::disableQuietMode() - * - * @access public - * @return bool - */ - function isQuietModeEnabled() - { - return $this->quiet_mode; - } - - /** - * Enable request-pty when using exec() - * - * @access public - */ - function enablePTY() - { - $this->request_pty = true; - } - - /** - * Disable request-pty when using exec() - * - * @access public - */ - function disablePTY() - { - $this->request_pty = false; - } - - /** - * Returns whether request-pty is enabled or not - * - * @see self::enablePTY() - * @see self::disablePTY() - * - * @access public - * @return bool - */ - function isPTYEnabled() - { - return $this->request_pty; - } - - /** - * 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, $skip_extended = false) - { - if (!empty($this->channel_buffers[$client_channel])) { - return array_shift($this->channel_buffers[$client_channel]); - } - - while (true) { - if ($this->curTimeout) { - if ($this->curTimeout < 0) { - $this->is_timeout = true; - return true; - } - - $read = array($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->is_timeout = true; - return true; - } - $elapsed = strtok(microtime(), ' ') + strtok('') - $start; - $this->curTimeout-= $elapsed; - } - - $response = $this->_get_binary_packet(); - if ($response === false) { - user_error('Connection closed by server'); - return false; - } - if ($client_channel == -1 && $response === true) { - return true; - } - if (!strlen($response)) { - return ''; - } - - extract(unpack('Ctype', $this->_string_shift($response, 1))); - - if ($type == NET_SSH2_MSG_CHANNEL_OPEN) { - extract(unpack('Nlength', $this->_string_shift($response, 4))); - } else { - extract(unpack('Nchannel', $this->_string_shift($response, 4))); - } - - // will not be setup yet on incoming channel open request - if (isset($channel) && isset($this->channel_status[$channel]) && isset($this->window_size_server_to_client[$channel])) { - $this->window_size_server_to_client[$channel]-= strlen($response); - - // resize the window, if appropriate - if ($this->window_size_server_to_client[$channel] < 0) { - $packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$channel], $this->window_size); - if (!$this->_send_binary_packet($packet)) { - return false; - } - $this->window_size_server_to_client[$channel]+= $this->window_size; - } - - switch ($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))); - $this->server_channels[$channel] = $server_channel; - extract(unpack('Nwindow_size', $this->_string_shift($response, 4))); - if ($window_size < 0) { - $window_size&= 0x7FFFFFFF; - $window_size+= 0x80000000; - } - $this->window_size_client_to_server[$channel] = $window_size; - $temp = unpack('Npacket_size_client_to_server', $this->_string_shift($response, 4)); - $this->packet_size_client_to_server[$channel] = $temp['packet_size_client_to_server']; - $result = $client_channel == $channel ? true : $this->_get_channel_packet($client_channel, $skip_extended); - $this->_on_channel_open(); - return $result; - //case NET_SSH2_MSG_CHANNEL_OPEN_FAILURE: - default: - user_error('Unable to open channel'); - 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: - return false; - default: - user_error('Unable to fulfill channel request'); - return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); - } - case NET_SSH2_MSG_CHANNEL_CLOSE: - return $type == NET_SSH2_MSG_CHANNEL_CLOSE ? true : $this->_get_channel_packet($client_channel, $skip_extended); - } - } - - // ie. $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_DATA - - switch ($type) { - case NET_SSH2_MSG_CHANNEL_DATA: - /* - if ($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. - $this->_send_channel_packet($channel, chr(0)); - } - */ - extract(unpack('Nlength', $this->_string_shift($response, 4))); - $data = $this->_string_shift($response, $length); - - if ($channel == NET_SSH2_CHANNEL_AGENT_FORWARD) { - $agent_response = $this->agent->_forward_data($data); - if (!is_bool($agent_response)) { - $this->_send_channel_packet($channel, $agent_response); - } - break; - } - - if ($client_channel == $channel) { - return $data; - } - if (!isset($this->channel_buffers[$channel])) { - $this->channel_buffers[$channel] = array(); - } - $this->channel_buffers[$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); - $this->stdErrorLog.= $data; - if ($skip_extended || $this->quiet_mode) { - break; - } - if ($client_channel == $channel) { - return $data; - } - if (!isset($this->channel_buffers[$channel])) { - $this->channel_buffers[$channel] = array(); - } - $this->channel_buffers[$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); - } - - $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_EOF, $this->server_channels[$client_channel])); - $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel])); - - $this->channel_status[$channel] = NET_SSH2_MSG_CHANNEL_EOF; - - break; - case 'exit-status': - extract(unpack('Cfalse/Nexit_status', $this->_string_shift($response, 5))); - $this->exit_status = $exit_status; - - // "The client MAY ignore these messages." - // -- http://tools.ietf.org/html/rfc4254#section-6.10 - - break; - 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: - $this->curTimeout = 0; - - if ($this->bitmap & NET_SSH2_MASK_SHELL) { - $this->bitmap&= ~NET_SSH2_MASK_SHELL; - } - if ($this->channel_status[$channel] != NET_SSH2_MSG_CHANNEL_EOF) { - $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel])); - } - - $this->channel_status[$channel] = NET_SSH2_MSG_CHANNEL_CLOSE; - if ($client_channel == $channel) { - return true; - } - case NET_SSH2_MSG_CHANNEL_EOF: - break; - default: - user_error('Error reading channel data'); - return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); - } - } - } - - /** - * Sends Binary Packets - * - * See '6. Binary Packet Protocol' of rfc4253 for more info. - * - * @param string $data - * @param string $logged - * @see self::_get_binary_packet() - * @return bool - * @access private - */ - function _send_binary_packet($data, $logged = null) - { - if (!is_resource($this->fsock) || feof($this->fsock)) { - user_error('Connection closed prematurely'); - $this->bitmap = 0; - return false; - } - - //if ($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; - $padding = crypt_random_string($padding_length); - - // 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')) { - $current = strtok(microtime(), ' ') + strtok(''); - $message_number = isset($this->message_numbers[ord($data[0])]) ? $this->message_numbers[ord($data[0])] : 'UNKNOWN (' . ord($data[0]) . ')'; - $message_number = '-> ' . $message_number . - ' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($stop - $start, 4) . 's)'; - $this->_append_log($message_number, isset($logged) ? $logged : $data); - $this->last_packet = $current; - } - - return $result; - } - - /** - * Logs data packets - * - * Makes sure that only the last 1MB worth of packets will be logged - * - * @param string $data - * @access private - */ - function _append_log($message_number, $message) - { - // remove the byte identifying the message type from all but the first two messages (ie. the identification strings) - if (strlen($message_number) > 2) { - $this->_string_shift($message); - } - - switch (NET_SSH2_LOGGING) { - // useful for benchmarks - case NET_SSH2_LOG_SIMPLE: - $this->message_number_log[] = $message_number; - break; - // the most useful log for SSH2 - case NET_SSH2_LOG_COMPLEX: - $this->message_number_log[] = $message_number; - $this->log_size+= strlen($message); - $this->message_log[] = $message; - while ($this->log_size > NET_SSH2_LOG_MAX_SIZE) { - $this->log_size-= strlen(array_shift($this->message_log)); - array_shift($this->message_number_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 NET_SSH2_LOG_REALTIME: - switch (PHP_SAPI) { - case 'cli': - $start = $stop = "\r\n"; - break; - default: - $start = '<pre>'; - $stop = '</pre>'; - } - echo $start . $this->_format_log(array($message), array($message_number)) . $stop; - @flush(); - @ob_flush(); - break; - // basically the same thing as NET_SSH2_LOG_REALTIME with the caveat that NET_SSH2_LOG_REALTIME_FILE - // needs to be defined and that the resultant log file will be capped out at NET_SSH2_LOG_MAX_SIZE. - // the earliest part of the log file is denoted by the first <<< START >>> and is not going to necessarily - // at the beginning of the file - case NET_SSH2_LOG_REALTIME_FILE: - if (!isset($this->realtime_log_file)) { - // PHP doesn't seem to like using constants in fopen() - $filename = NET_SSH2_LOG_REALTIME_FILENAME; - $fp = fopen($filename, 'w'); - $this->realtime_log_file = $fp; - } - if (!is_resource($this->realtime_log_file)) { - break; - } - $entry = $this->_format_log(array($message), array($message_number)); - if ($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 ($this->realtime_log_size > NET_SSH2_LOG_MAX_SIZE) { - fseek($this->realtime_log_file, 0); - $this->realtime_log_size = strlen($entry); - $this->realtime_log_wrap = true; - } - fputs($this->realtime_log_file, $entry); - } - } - - /** - * Sends channel data - * - * Spans multiple SSH_MSG_CHANNEL_DATAs if appropriate - * - * @param int $client_channel - * @param string $data - * @return bool - * @access private - */ - function _send_channel_packet($client_channel, $data) - { - while (strlen($data)) { - if (!$this->window_size_client_to_server[$client_channel]) { - $this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST; - // using an invalid channel will let the buffers be built up for the valid channels - $this->_get_channel_packet(-1); - $this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST; - } - - /* The maximum amount of data allowed is determined by the maximum - packet size for the channel, and the current window size, whichever - is smaller. - -- http://tools.ietf.org/html/rfc4254#section-5.2 */ - $max_size = min( - $this->packet_size_client_to_server[$client_channel], - $this->window_size_client_to_server[$client_channel] - ); - - $temp = $this->_string_shift($data, $max_size); - $packet = pack( - 'CN2a*', - NET_SSH2_MSG_CHANNEL_DATA, - $this->server_channels[$client_channel], - strlen($temp), - $temp - ); - $this->window_size_client_to_server[$client_channel]-= strlen($temp); - if (!$this->_send_binary_packet($packet)) { - return false; - } - } - - return true; - } - - /** - * Closes and flushes a channel - * - * Net_SSH2 doesn't properly close most channels. For exec() channels are normally closed by the server - * and for SFTP channels are presumably closed when the client disconnects. This functions is intended - * for SCP more than anything. - * - * @param int $client_channel - * @param bool $want_reply - * @return bool - * @access private - */ - function _close_channel($client_channel, $want_reply = false) - { - // see http://tools.ietf.org/html/rfc4254#section-5.3 - - $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_EOF, $this->server_channels[$client_channel])); - - if (!$want_reply) { - $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$client_channel])); - } - - $this->channel_status[$client_channel] = NET_SSH2_MSG_CHANNEL_CLOSE; - - $this->curTimeout = 0; - - while (!is_bool($this->_get_channel_packet($client_channel))) { - } - - if ($want_reply) { - $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$client_channel])); - } - - if ($this->bitmap & NET_SSH2_MASK_SHELL) { - $this->bitmap&= ~NET_SSH2_MASK_SHELL; - } - } - - /** - * Disconnect - * - * @param int $reason - * @return bool - * @access private - */ - function _disconnect($reason) - { - if ($this->bitmap & NET_SSH2_MASK_CONNECTED) { - $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 int $index - * @return string - * @access private - */ - function _string_shift(&$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 array|false|string - */ - 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) - { - $output = ''; - for ($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 = $this->_string_shift($current_log, $this->log_short_width); - $hex = substr(preg_replace_callback('#.#s', array($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 $matches - * @access private - * @return string - */ - function _format_log_helper($matches) - { - return $this->log_boundary . str_pad(dechex(ord($matches[0])), 2, '0', STR_PAD_LEFT); - } - - /** - * Helper function for agent->_on_channel_open() - * - * Used when channels are created to inform agent - * of said channel opening. Must be called after - * channel open confirmation received - * - * @access private - */ - function _on_channel_open() - { - if (isset($this->agent)) { - $this->agent->_on_channel_open($this); - } - } - - /** - * Returns the first value of the intersection of two arrays or false if - * the intersection is empty. The order is defined by the first parameter. - * - * @param array $array1 - * @param array $array2 - * @return mixed False if intersection is empty, else intersected value. - * @access private - */ - function _array_intersect_first($array1, $array2) - { - foreach ($array1 as $value) { - if (in_array($value, $array2)) { - return $value; - } - } - return false; - } - - /** - * Returns all errors - * - * @return string[] - * @access public - */ - function getErrors() - { - return $this->errors; - } - - /** - * Returns the last error - * - * @return string - * @access public - */ - function getLastError() - { - $count = count($this->errors); - - if ($count > 0) { - return $this->errors[$count - 1]; - } - } - - /** - * Return the server identification. - * - * @return string - * @access public - */ - function getServerIdentification() - { - $this->_connect(); - - return $this->server_identifier; - } - - /** - * Return a list of the key exchange algorithms the server supports. - * - * @return array - * @access public - */ - function getKexAlgorithms() - { - $this->_connect(); - - return $this->kex_algorithms; - } - - /** - * Return a list of the host key (public key) algorithms the server supports. - * - * @return array - * @access public - */ - function getServerHostKeyAlgorithms() - { - $this->_connect(); - - 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() - { - $this->_connect(); - - 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() - { - $this->_connect(); - - 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() - { - $this->_connect(); - - 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() - { - $this->_connect(); - - 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() - { - $this->_connect(); - - 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() - { - $this->_connect(); - - 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() - { - $this->_connect(); - - 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() - { - $this->_connect(); - - return $this->languages_client_to_server; - } - - /** - * Returns the banner message. - * - * Quoting from the RFC, "in some jurisdictions, sending a warning message before - * authentication may be relevant for getting legal protection." - * - * @return string - * @access public - */ - function getBannerMessage() - { - return $this->banner_message; - } - - /** - * Returns the server public host key. - * - * Caching this the first time you connect to a server and checking the result on subsequent connections - * is recommended. Returns false if the server signature is not signed correctly with the public host key. - * - * @return mixed - * @access public - */ - function getServerPublicHostKey() - { - if (!($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR)) { - if (!$this->_connect()) { - return false; - } - } - - $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, $length); - - if ($this->signature_validated) { - return $this->bitmap ? - $this->signature_format . ' ' . base64_encode($this->server_public_host_key) : - false; - } - - $this->signature_validated = true; - - switch ($this->signature_format) { - case 'ssh-dss': - $zero = new Math_BigInteger(); - - $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'); - 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); - - switch (true) { - case $r->equals($zero): - case $r->compare($q) >= 0: - case $s->equals($zero): - case $s->compare($q) >= 0: - user_error('Invalid signature'); - return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); - } - - $w = $s->modInverse($q); - - $u1 = $w->multiply(new Math_BigInteger(sha1($this->exchange_hash), 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'); - 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)); - $rawN = $this->_string_shift($server_public_host_key, $temp['length']); - $n = new Math_BigInteger($rawN, -256); - $nLength = strlen(ltrim($rawN, "\0")); - - /* - $temp = unpack('Nlength', $this->_string_shift($signature, 4)); - $signature = $this->_string_shift($signature, $temp['length']); - - if (!class_exists('Crypt_RSA')) { - include_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->exchange_hash, $signature)) { - user_error('Bad server signature'); - 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'); - 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->exchange_hash)); - $h = chr(0x01) . str_repeat(chr(0xFF), $nLength - 2 - strlen($h)) . $h; - - if ($s != $h) { - user_error('Bad server signature'); - return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE); - } - break; - default: - user_error('Unsupported signature format'); - return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE); - } - - return $this->signature_format . ' ' . base64_encode($this->server_public_host_key); - } - - /** - * Returns the exit status of an SSH command or false. - * - * @return false|int - * @access public - */ - function getExitStatus() - { - if (is_null($this->exit_status)) { - return false; - } - return $this->exit_status; - } - - /** - * Returns the number of columns for the terminal window size. - * - * @return int - * @access public - */ - function getWindowColumns() - { - return $this->windowColumns; - } - - /** - * Returns the number of rows for the terminal window size. - * - * @return int - * @access public - */ - function getWindowRows() - { - return $this->windowRows; - } - - /** - * Sets the number of columns for the terminal window size. - * - * @param int $value - * @access public - */ - function setWindowColumns($value) - { - $this->windowColumns = $value; - } - - /** - * Sets the number of rows for the terminal window size. - * - * @param int $value - * @access public - */ - function setWindowRows($value) - { - $this->windowRows = $value; - } - - /** - * Sets the number of columns and rows for the terminal window size. - * - * @param int $columns - * @param int $rows - * @access public - */ - function setWindowSize($columns = 80, $rows = 24) - { - $this->windowColumns = $columns; - $this->windowRows = $rows; - } -} |