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1 <?php 2 3 /** 4 * Pure-PHP implementation of SSHv2. 5 * 6 * PHP version 5 7 * 8 * Here are some examples of how to use this library: 9 * <code> 10 * <?php 11 * include 'vendor/autoload.php'; 12 * 13 * $ssh = new \phpseclib\Net\SSH2('www.domain.tld'); 14 * if (!$ssh->login('username', 'password')) { 15 * exit('Login Failed'); 16 * } 17 * 18 * echo $ssh->exec('pwd'); 19 * echo $ssh->exec('ls -la'); 20 * ?> 21 * </code> 22 * 23 * <code> 24 * <?php 25 * include 'vendor/autoload.php'; 26 * 27 * $key = new \phpseclib\Crypt\RSA(); 28 * //$key->setPassword('whatever'); 29 * $key->loadKey(file_get_contents('privatekey')); 30 * 31 * $ssh = new \phpseclib\Net\SSH2('www.domain.tld'); 32 * if (!$ssh->login('username', $key)) { 33 * exit('Login Failed'); 34 * } 35 * 36 * echo $ssh->read('username@username:~$'); 37 * $ssh->write("ls -la\n"); 38 * echo $ssh->read('username@username:~$'); 39 * ?> 40 * </code> 41 * 42 * @category Net 43 * @package SSH2 44 * @author Jim Wigginton <terrafrost@php.net> 45 * @copyright 2007 Jim Wigginton 46 * @license http://www.opensource.org/licenses/mit-license.html MIT License 47 * @link http://phpseclib.sourceforge.net 48 */ 49 50 namespace phpseclib\Net; 51 52 use phpseclib\Crypt\Base; 53 use phpseclib\Crypt\Blowfish; 54 use phpseclib\Crypt\Hash; 55 use phpseclib\Crypt\Random; 56 use phpseclib\Crypt\RC4; 57 use phpseclib\Crypt\Rijndael; 58 use phpseclib\Crypt\RSA; 59 use phpseclib\Crypt\TripleDES; 60 use phpseclib\Crypt\Twofish; 61 use phpseclib\Math\BigInteger; // Used to do Diffie-Hellman key exchange and DSA/RSA signature verification. 62 use phpseclib\System\SSH\Agent; 63 64 /** 65 * Pure-PHP implementation of SSHv2. 66 * 67 * @package SSH2 68 * @author Jim Wigginton <terrafrost@php.net> 69 * @access public 70 */ 71 class SSH2 72 { 73 /**#@+ 74 * Execution Bitmap Masks 75 * 76 * @see \phpseclib\Net\SSH2::bitmap 77 * @access private 78 */ 79 const MASK_CONSTRUCTOR = 0x00000001; 80 const MASK_CONNECTED = 0x00000002; 81 const MASK_LOGIN_REQ = 0x00000004; 82 const MASK_LOGIN = 0x00000008; 83 const MASK_SHELL = 0x00000010; 84 const MASK_WINDOW_ADJUST = 0x00000020; 85 /**#@-*/ 86 87 /**#@+ 88 * Channel constants 89 * 90 * RFC4254 refers not to client and server channels but rather to sender and recipient channels. we don't refer 91 * to them in that way because RFC4254 toggles the meaning. the client sends a SSH_MSG_CHANNEL_OPEN message with 92 * a sender channel and the server sends a SSH_MSG_CHANNEL_OPEN_CONFIRMATION in response, with a sender and a 93 * recepient channel. at first glance, you might conclude that SSH_MSG_CHANNEL_OPEN_CONFIRMATION's sender channel 94 * would be the same thing as SSH_MSG_CHANNEL_OPEN's sender channel, but it's not, per this snipet: 95 * The 'recipient channel' is the channel number given in the original 96 * open request, and 'sender channel' is the channel number allocated by 97 * the other side. 98 * 99 * @see \phpseclib\Net\SSH2::_send_channel_packet() 100 * @see \phpseclib\Net\SSH2::_get_channel_packet() 101 * @access private 102 */ 103 const CHANNEL_EXEC = 1; // PuTTy uses 0x100 104 const CHANNEL_SHELL = 2; 105 const CHANNEL_SUBSYSTEM = 3; 106 const CHANNEL_AGENT_FORWARD = 4; 107 const CHANNEL_KEEP_ALIVE = 5; 108 /**#@-*/ 109 110 /**#@+ 111 * @access public 112 * @see \phpseclib\Net\SSH2::getLog() 113 */ 114 /** 115 * Returns the message numbers 116 */ 117 const LOG_SIMPLE = 1; 118 /** 119 * Returns the message content 120 */ 121 const LOG_COMPLEX = 2; 122 /** 123 * Outputs the content real-time 124 */ 125 const LOG_REALTIME = 3; 126 /** 127 * Dumps the content real-time to a file 128 */ 129 const LOG_REALTIME_FILE = 4; 130 /** 131 * Make sure that the log never gets larger than this 132 */ 133 const LOG_MAX_SIZE = 1048576; // 1024 * 1024 134 /**#@-*/ 135 136 /**#@+ 137 * @access public 138 * @see \phpseclib\Net\SSH2::read() 139 */ 140 /** 141 * Returns when a string matching $expect exactly is found 142 */ 143 const READ_SIMPLE = 1; 144 /** 145 * Returns when a string matching the regular expression $expect is found 146 */ 147 const READ_REGEX = 2; 148 /** 149 * Returns whenever a data packet is received. 150 * 151 * Some data packets may only contain a single character so it may be necessary 152 * to call read() multiple times when using this option 153 */ 154 const READ_NEXT = 3; 155 /**#@-*/ 156 157 /** 158 * The SSH identifier 159 * 160 * @var string 161 * @access private 162 */ 163 var $identifier; 164 165 /** 166 * The Socket Object 167 * 168 * @var object 169 * @access private 170 */ 171 var $fsock; 172 173 /** 174 * Execution Bitmap 175 * 176 * The bits that are set represent functions that have been called already. This is used to determine 177 * if a requisite function has been successfully executed. If not, an error should be thrown. 178 * 179 * @var int 180 * @access private 181 */ 182 var $bitmap = 0; 183 184 /** 185 * Error information 186 * 187 * @see self::getErrors() 188 * @see self::getLastError() 189 * @var string 190 * @access private 191 */ 192 var $errors = array(); 193 194 /** 195 * Server Identifier 196 * 197 * @see self::getServerIdentification() 198 * @var array|false 199 * @access private 200 */ 201 var $server_identifier = false; 202 203 /** 204 * Key Exchange Algorithms 205 * 206 * @see self::getKexAlgorithims() 207 * @var array|false 208 * @access private 209 */ 210 var $kex_algorithms = false; 211 212 /** 213 * Key Exchange Algorithm 214 * 215 * @see self::getMethodsNegotiated() 216 * @var string|false 217 * @access private 218 */ 219 var $kex_algorithm = false; 220 221 /** 222 * Minimum Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods 223 * 224 * @see self::_key_exchange() 225 * @var int 226 * @access private 227 */ 228 var $kex_dh_group_size_min = 1536; 229 230 /** 231 * Preferred Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods 232 * 233 * @see self::_key_exchange() 234 * @var int 235 * @access private 236 */ 237 var $kex_dh_group_size_preferred = 2048; 238 239 /** 240 * Maximum Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods 241 * 242 * @see self::_key_exchange() 243 * @var int 244 * @access private 245 */ 246 var $kex_dh_group_size_max = 4096; 247 248 /** 249 * Server Host Key Algorithms 250 * 251 * @see self::getServerHostKeyAlgorithms() 252 * @var array|false 253 * @access private 254 */ 255 var $server_host_key_algorithms = false; 256 257 /** 258 * Encryption Algorithms: Client to Server 259 * 260 * @see self::getEncryptionAlgorithmsClient2Server() 261 * @var array|false 262 * @access private 263 */ 264 var $encryption_algorithms_client_to_server = false; 265 266 /** 267 * Encryption Algorithms: Server to Client 268 * 269 * @see self::getEncryptionAlgorithmsServer2Client() 270 * @var array|false 271 * @access private 272 */ 273 var $encryption_algorithms_server_to_client = false; 274 275 /** 276 * MAC Algorithms: Client to Server 277 * 278 * @see self::getMACAlgorithmsClient2Server() 279 * @var array|false 280 * @access private 281 */ 282 var $mac_algorithms_client_to_server = false; 283 284 /** 285 * MAC Algorithms: Server to Client 286 * 287 * @see self::getMACAlgorithmsServer2Client() 288 * @var array|false 289 * @access private 290 */ 291 var $mac_algorithms_server_to_client = false; 292 293 /** 294 * Compression Algorithms: Client to Server 295 * 296 * @see self::getCompressionAlgorithmsClient2Server() 297 * @var array|false 298 * @access private 299 */ 300 var $compression_algorithms_client_to_server = false; 301 302 /** 303 * Compression Algorithms: Server to Client 304 * 305 * @see self::getCompressionAlgorithmsServer2Client() 306 * @var array|false 307 * @access private 308 */ 309 var $compression_algorithms_server_to_client = false; 310 311 /** 312 * Languages: Server to Client 313 * 314 * @see self::getLanguagesServer2Client() 315 * @var array|false 316 * @access private 317 */ 318 var $languages_server_to_client = false; 319 320 /** 321 * Languages: Client to Server 322 * 323 * @see self::getLanguagesClient2Server() 324 * @var array|false 325 * @access private 326 */ 327 var $languages_client_to_server = false; 328 329 /** 330 * Preferred Algorithms 331 * 332 * @see self::setPreferredAlgorithms() 333 * @var array 334 * @access private 335 */ 336 var $preferred = array(); 337 338 /** 339 * Block Size for Server to Client Encryption 340 * 341 * "Note that the length of the concatenation of 'packet_length', 342 * 'padding_length', 'payload', and 'random padding' MUST be a multiple 343 * of the cipher block size or 8, whichever is larger. This constraint 344 * MUST be enforced, even when using stream ciphers." 345 * 346 * -- http://tools.ietf.org/html/rfc4253#section-6 347 * 348 * @see self::__construct() 349 * @see self::_send_binary_packet() 350 * @var int 351 * @access private 352 */ 353 var $encrypt_block_size = 8; 354 355 /** 356 * Block Size for Client to Server Encryption 357 * 358 * @see self::__construct() 359 * @see self::_get_binary_packet() 360 * @var int 361 * @access private 362 */ 363 var $decrypt_block_size = 8; 364 365 /** 366 * Server to Client Encryption Object 367 * 368 * @see self::_get_binary_packet() 369 * @var object 370 * @access private 371 */ 372 var $decrypt = false; 373 374 /** 375 * Client to Server Encryption Object 376 * 377 * @see self::_send_binary_packet() 378 * @var object 379 * @access private 380 */ 381 var $encrypt = false; 382 383 /** 384 * Client to Server HMAC Object 385 * 386 * @see self::_send_binary_packet() 387 * @var object 388 * @access private 389 */ 390 var $hmac_create = false; 391 392 /** 393 * Server to Client HMAC Object 394 * 395 * @see self::_get_binary_packet() 396 * @var object 397 * @access private 398 */ 399 var $hmac_check = false; 400 401 /** 402 * Size of server to client HMAC 403 * 404 * 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. 405 * 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 406 * append it. 407 * 408 * @see self::_get_binary_packet() 409 * @var int 410 * @access private 411 */ 412 var $hmac_size = false; 413 414 /** 415 * Server Public Host Key 416 * 417 * @see self::getServerPublicHostKey() 418 * @var string 419 * @access private 420 */ 421 var $server_public_host_key; 422 423 /** 424 * Session identifier 425 * 426 * "The exchange hash H from the first key exchange is additionally 427 * used as the session identifier, which is a unique identifier for 428 * this connection." 429 * 430 * -- http://tools.ietf.org/html/rfc4253#section-7.2 431 * 432 * @see self::_key_exchange() 433 * @var string 434 * @access private 435 */ 436 var $session_id = false; 437 438 /** 439 * Exchange hash 440 * 441 * The current exchange hash 442 * 443 * @see self::_key_exchange() 444 * @var string 445 * @access private 446 */ 447 var $exchange_hash = false; 448 449 /** 450 * Message Numbers 451 * 452 * @see self::__construct() 453 * @var array 454 * @access private 455 */ 456 var $message_numbers = array(); 457 458 /** 459 * Disconnection Message 'reason codes' defined in RFC4253 460 * 461 * @see self::__construct() 462 * @var array 463 * @access private 464 */ 465 var $disconnect_reasons = array(); 466 467 /** 468 * SSH_MSG_CHANNEL_OPEN_FAILURE 'reason codes', defined in RFC4254 469 * 470 * @see self::__construct() 471 * @var array 472 * @access private 473 */ 474 var $channel_open_failure_reasons = array(); 475 476 /** 477 * Terminal Modes 478 * 479 * @link http://tools.ietf.org/html/rfc4254#section-8 480 * @see self::__construct() 481 * @var array 482 * @access private 483 */ 484 var $terminal_modes = array(); 485 486 /** 487 * SSH_MSG_CHANNEL_EXTENDED_DATA's data_type_codes 488 * 489 * @link http://tools.ietf.org/html/rfc4254#section-5.2 490 * @see self::__construct() 491 * @var array 492 * @access private 493 */ 494 var $channel_extended_data_type_codes = array(); 495 496 /** 497 * Send Sequence Number 498 * 499 * See 'Section 6.4. Data Integrity' of rfc4253 for more info. 500 * 501 * @see self::_send_binary_packet() 502 * @var int 503 * @access private 504 */ 505 var $send_seq_no = 0; 506 507 /** 508 * Get Sequence Number 509 * 510 * See 'Section 6.4. Data Integrity' of rfc4253 for more info. 511 * 512 * @see self::_get_binary_packet() 513 * @var int 514 * @access private 515 */ 516 var $get_seq_no = 0; 517 518 /** 519 * Server Channels 520 * 521 * Maps client channels to server channels 522 * 523 * @see self::_get_channel_packet() 524 * @see self::exec() 525 * @var array 526 * @access private 527 */ 528 var $server_channels = array(); 529 530 /** 531 * Channel Buffers 532 * 533 * If a client requests a packet from one channel but receives two packets from another those packets should 534 * be placed in a buffer 535 * 536 * @see self::_get_channel_packet() 537 * @see self::exec() 538 * @var array 539 * @access private 540 */ 541 var $channel_buffers = array(); 542 543 /** 544 * Channel Status 545 * 546 * Contains the type of the last sent message 547 * 548 * @see self::_get_channel_packet() 549 * @var array 550 * @access private 551 */ 552 var $channel_status = array(); 553 554 /** 555 * Packet Size 556 * 557 * Maximum packet size indexed by channel 558 * 559 * @see self::_send_channel_packet() 560 * @var array 561 * @access private 562 */ 563 var $packet_size_client_to_server = array(); 564 565 /** 566 * Message Number Log 567 * 568 * @see self::getLog() 569 * @var array 570 * @access private 571 */ 572 var $message_number_log = array(); 573 574 /** 575 * Message Log 576 * 577 * @see self::getLog() 578 * @var array 579 * @access private 580 */ 581 var $message_log = array(); 582 583 /** 584 * The Window Size 585 * 586 * Bytes the other party can send before it must wait for the window to be adjusted (0x7FFFFFFF = 2GB) 587 * 588 * @var int 589 * @see self::_send_channel_packet() 590 * @see self::exec() 591 * @access private 592 */ 593 var $window_size = 0x7FFFFFFF; 594 595 /** 596 * Window size, server to client 597 * 598 * Window size indexed by channel 599 * 600 * @see self::_send_channel_packet() 601 * @var array 602 * @access private 603 */ 604 var $window_size_server_to_client = array(); 605 606 /** 607 * Window size, client to server 608 * 609 * Window size indexed by channel 610 * 611 * @see self::_get_channel_packet() 612 * @var array 613 * @access private 614 */ 615 var $window_size_client_to_server = array(); 616 617 /** 618 * Server signature 619 * 620 * Verified against $this->session_id 621 * 622 * @see self::getServerPublicHostKey() 623 * @var string 624 * @access private 625 */ 626 var $signature = ''; 627 628 /** 629 * Server signature format 630 * 631 * ssh-rsa or ssh-dss. 632 * 633 * @see self::getServerPublicHostKey() 634 * @var string 635 * @access private 636 */ 637 var $signature_format = ''; 638 639 /** 640 * Interactive Buffer 641 * 642 * @see self::read() 643 * @var array 644 * @access private 645 */ 646 var $interactiveBuffer = ''; 647 648 /** 649 * Current log size 650 * 651 * Should never exceed self::LOG_MAX_SIZE 652 * 653 * @see self::_send_binary_packet() 654 * @see self::_get_binary_packet() 655 * @var int 656 * @access private 657 */ 658 var $log_size; 659 660 /** 661 * Timeout 662 * 663 * @see self::setTimeout() 664 * @access private 665 */ 666 var $timeout; 667 668 /** 669 * Current Timeout 670 * 671 * @see self::_get_channel_packet() 672 * @access private 673 */ 674 var $curTimeout; 675 676 /** 677 * Real-time log file pointer 678 * 679 * @see self::_append_log() 680 * @var resource 681 * @access private 682 */ 683 var $realtime_log_file; 684 685 /** 686 * Real-time log file size 687 * 688 * @see self::_append_log() 689 * @var int 690 * @access private 691 */ 692 var $realtime_log_size; 693 694 /** 695 * Has the signature been validated? 696 * 697 * @see self::getServerPublicHostKey() 698 * @var bool 699 * @access private 700 */ 701 var $signature_validated = false; 702 703 /** 704 * Real-time log file wrap boolean 705 * 706 * @see self::_append_log() 707 * @access private 708 */ 709 var $realtime_log_wrap; 710 711 /** 712 * Flag to suppress stderr from output 713 * 714 * @see self::enableQuietMode() 715 * @access private 716 */ 717 var $quiet_mode = false; 718 719 /** 720 * Time of first network activity 721 * 722 * @var int 723 * @access private 724 */ 725 var $last_packet; 726 727 /** 728 * Exit status returned from ssh if any 729 * 730 * @var int 731 * @access private 732 */ 733 var $exit_status; 734 735 /** 736 * Flag to request a PTY when using exec() 737 * 738 * @var bool 739 * @see self::enablePTY() 740 * @access private 741 */ 742 var $request_pty = false; 743 744 /** 745 * Flag set while exec() is running when using enablePTY() 746 * 747 * @var bool 748 * @access private 749 */ 750 var $in_request_pty_exec = false; 751 752 /** 753 * Flag set after startSubsystem() is called 754 * 755 * @var bool 756 * @access private 757 */ 758 var $in_subsystem; 759 760 /** 761 * Contents of stdError 762 * 763 * @var string 764 * @access private 765 */ 766 var $stdErrorLog; 767 768 /** 769 * The Last Interactive Response 770 * 771 * @see self::_keyboard_interactive_process() 772 * @var string 773 * @access private 774 */ 775 var $last_interactive_response = ''; 776 777 /** 778 * Keyboard Interactive Request / Responses 779 * 780 * @see self::_keyboard_interactive_process() 781 * @var array 782 * @access private 783 */ 784 var $keyboard_requests_responses = array(); 785 786 /** 787 * Banner Message 788 * 789 * Quoting from the RFC, "in some jurisdictions, sending a warning message before 790 * authentication may be relevant for getting legal protection." 791 * 792 * @see self::_filter() 793 * @see self::getBannerMessage() 794 * @var string 795 * @access private 796 */ 797 var $banner_message = ''; 798 799 /** 800 * Did read() timeout or return normally? 801 * 802 * @see self::isTimeout() 803 * @var bool 804 * @access private 805 */ 806 var $is_timeout = false; 807 808 /** 809 * Log Boundary 810 * 811 * @see self::_format_log() 812 * @var string 813 * @access private 814 */ 815 var $log_boundary = ':'; 816 817 /** 818 * Log Long Width 819 * 820 * @see self::_format_log() 821 * @var int 822 * @access private 823 */ 824 var $log_long_width = 65; 825 826 /** 827 * Log Short Width 828 * 829 * @see self::_format_log() 830 * @var int 831 * @access private 832 */ 833 var $log_short_width = 16; 834 835 /** 836 * Hostname 837 * 838 * @see self::__construct() 839 * @see self::_connect() 840 * @var string 841 * @access private 842 */ 843 var $host; 844 845 /** 846 * Port Number 847 * 848 * @see self::__construct() 849 * @see self::_connect() 850 * @var int 851 * @access private 852 */ 853 var $port; 854 855 /** 856 * Number of columns for terminal window size 857 * 858 * @see self::getWindowColumns() 859 * @see self::setWindowColumns() 860 * @see self::setWindowSize() 861 * @var int 862 * @access private 863 */ 864 var $windowColumns = 80; 865 866 /** 867 * Number of columns for terminal window size 868 * 869 * @see self::getWindowRows() 870 * @see self::setWindowRows() 871 * @see self::setWindowSize() 872 * @var int 873 * @access private 874 */ 875 var $windowRows = 24; 876 877 /** 878 * Crypto Engine 879 * 880 * @see self::setCryptoEngine() 881 * @see self::_key_exchange() 882 * @var int 883 * @access private 884 */ 885 var $crypto_engine = false; 886 887 /** 888 * A System_SSH_Agent for use in the SSH2 Agent Forwarding scenario 889 * 890 * @var System_SSH_Agent 891 * @access private 892 */ 893 var $agent; 894 895 /** 896 * Send the identification string first? 897 * 898 * @var bool 899 * @access private 900 */ 901 var $send_id_string_first = true; 902 903 /** 904 * Send the key exchange initiation packet first? 905 * 906 * @var bool 907 * @access private 908 */ 909 var $send_kex_first = true; 910 911 /** 912 * Some versions of OpenSSH incorrectly calculate the key size 913 * 914 * @var bool 915 * @access private 916 */ 917 var $bad_key_size_fix = false; 918 919 /** 920 * Should we try to re-connect to re-establish keys? 921 * 922 * @var bool 923 * @access private 924 */ 925 var $retry_connect = false; 926 927 /** 928 * Binary Packet Buffer 929 * 930 * @var string|false 931 * @access private 932 */ 933 var $binary_packet_buffer = false; 934 935 /** 936 * Preferred Signature Format 937 * 938 * @var string|false 939 * @access private 940 */ 941 var $preferred_signature_format = false; 942 943 /** 944 * Authentication Credentials 945 * 946 * @var array 947 * @access private 948 */ 949 var $auth = array(); 950 951 /** 952 * Default Constructor. 953 * 954 * $host can either be a string, representing the host, or a stream resource. 955 * 956 * @param mixed $host 957 * @param int $port 958 * @param int $timeout 959 * @see self::login() 960 * @return \phpseclib\Net\SSH2 961 * @access public 962 */ 963 function __construct($host, $port = 22, $timeout = 10) 964 { 965 $this->message_numbers = array( 966 1 => 'NET_SSH2_MSG_DISCONNECT', 967 2 => 'NET_SSH2_MSG_IGNORE', 968 3 => 'NET_SSH2_MSG_UNIMPLEMENTED', 969 4 => 'NET_SSH2_MSG_DEBUG', 970 5 => 'NET_SSH2_MSG_SERVICE_REQUEST', 971 6 => 'NET_SSH2_MSG_SERVICE_ACCEPT', 972 20 => 'NET_SSH2_MSG_KEXINIT', 973 21 => 'NET_SSH2_MSG_NEWKEYS', 974 30 => 'NET_SSH2_MSG_KEXDH_INIT', 975 31 => 'NET_SSH2_MSG_KEXDH_REPLY', 976 50 => 'NET_SSH2_MSG_USERAUTH_REQUEST', 977 51 => 'NET_SSH2_MSG_USERAUTH_FAILURE', 978 52 => 'NET_SSH2_MSG_USERAUTH_SUCCESS', 979 53 => 'NET_SSH2_MSG_USERAUTH_BANNER', 980 981 80 => 'NET_SSH2_MSG_GLOBAL_REQUEST', 982 81 => 'NET_SSH2_MSG_REQUEST_SUCCESS', 983 82 => 'NET_SSH2_MSG_REQUEST_FAILURE', 984 90 => 'NET_SSH2_MSG_CHANNEL_OPEN', 985 91 => 'NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION', 986 92 => 'NET_SSH2_MSG_CHANNEL_OPEN_FAILURE', 987 93 => 'NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST', 988 94 => 'NET_SSH2_MSG_CHANNEL_DATA', 989 95 => 'NET_SSH2_MSG_CHANNEL_EXTENDED_DATA', 990 96 => 'NET_SSH2_MSG_CHANNEL_EOF', 991 97 => 'NET_SSH2_MSG_CHANNEL_CLOSE', 992 98 => 'NET_SSH2_MSG_CHANNEL_REQUEST', 993 99 => 'NET_SSH2_MSG_CHANNEL_SUCCESS', 994 100 => 'NET_SSH2_MSG_CHANNEL_FAILURE' 995 ); 996 $this->disconnect_reasons = array( 997 1 => 'NET_SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT', 998 2 => 'NET_SSH2_DISCONNECT_PROTOCOL_ERROR', 999 3 => 'NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED', 1000 4 => 'NET_SSH2_DISCONNECT_RESERVED', 1001 5 => 'NET_SSH2_DISCONNECT_MAC_ERROR', 1002 6 => 'NET_SSH2_DISCONNECT_COMPRESSION_ERROR', 1003 7 => 'NET_SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE', 1004 8 => 'NET_SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED', 1005 9 => 'NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE', 1006 10 => 'NET_SSH2_DISCONNECT_CONNECTION_LOST', 1007 11 => 'NET_SSH2_DISCONNECT_BY_APPLICATION', 1008 12 => 'NET_SSH2_DISCONNECT_TOO_MANY_CONNECTIONS', 1009 13 => 'NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER', 1010 14 => 'NET_SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE', 1011 15 => 'NET_SSH2_DISCONNECT_ILLEGAL_USER_NAME' 1012 ); 1013 $this->channel_open_failure_reasons = array( 1014 1 => 'NET_SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED' 1015 ); 1016 $this->terminal_modes = array( 1017 0 => 'NET_SSH2_TTY_OP_END' 1018 ); 1019 $this->channel_extended_data_type_codes = array( 1020 1 => 'NET_SSH2_EXTENDED_DATA_STDERR' 1021 ); 1022 1023 $this->_define_array( 1024 $this->message_numbers, 1025 $this->disconnect_reasons, 1026 $this->channel_open_failure_reasons, 1027 $this->terminal_modes, 1028 $this->channel_extended_data_type_codes, 1029 array(60 => 'NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ'), 1030 array(60 => 'NET_SSH2_MSG_USERAUTH_PK_OK'), 1031 array(60 => 'NET_SSH2_MSG_USERAUTH_INFO_REQUEST', 1032 61 => 'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE'), 1033 // RFC 4419 - diffie-hellman-group-exchange-sha{1,256} 1034 array(30 => 'NET_SSH2_MSG_KEXDH_GEX_REQUEST_OLD', 1035 31 => 'NET_SSH2_MSG_KEXDH_GEX_GROUP', 1036 32 => 'NET_SSH2_MSG_KEXDH_GEX_INIT', 1037 33 => 'NET_SSH2_MSG_KEXDH_GEX_REPLY', 1038 34 => 'NET_SSH2_MSG_KEXDH_GEX_REQUEST'), 1039 // RFC 5656 - Elliptic Curves (for curve25519-sha256@libssh.org) 1040 array(30 => 'NET_SSH2_MSG_KEX_ECDH_INIT', 1041 31 => 'NET_SSH2_MSG_KEX_ECDH_REPLY') 1042 ); 1043 1044 if (is_resource($host)) { 1045 $this->fsock = $host; 1046 return; 1047 } 1048 1049 if (is_string($host)) { 1050 $this->host = $host; 1051 $this->port = $port; 1052 $this->timeout = $timeout; 1053 } 1054 } 1055 1056 /** 1057 * Set Crypto Engine Mode 1058 * 1059 * Possible $engine values: 1060 * CRYPT_MODE_INTERNAL, CRYPT_MODE_MCRYPT 1061 * 1062 * @param int $engine 1063 * @access public 1064 */ 1065 function setCryptoEngine($engine) 1066 { 1067 $this->crypto_engine = $engine; 1068 } 1069 1070 /** 1071 * Send Identification String First 1072 * 1073 * https://tools.ietf.org/html/rfc4253#section-4.2 says "when the connection has been established, 1074 * both sides MUST send an identification string". It does not say which side sends it first. In 1075 * theory it shouldn't matter but it is a fact of life that some SSH servers are simply buggy 1076 * 1077 * @access public 1078 */ 1079 function sendIdentificationStringFirst() 1080 { 1081 $this->send_id_string_first = true; 1082 } 1083 1084 /** 1085 * Send Identification String Last 1086 * 1087 * https://tools.ietf.org/html/rfc4253#section-4.2 says "when the connection has been established, 1088 * both sides MUST send an identification string". It does not say which side sends it first. In 1089 * theory it shouldn't matter but it is a fact of life that some SSH servers are simply buggy 1090 * 1091 * @access public 1092 */ 1093 function sendIdentificationStringLast() 1094 { 1095 $this->send_id_string_first = false; 1096 } 1097 1098 /** 1099 * Send SSH_MSG_KEXINIT First 1100 * 1101 * https://tools.ietf.org/html/rfc4253#section-7.1 says "key exchange begins by each sending 1102 * sending the [SSH_MSG_KEXINIT] packet". It does not say which side sends it first. In theory 1103 * it shouldn't matter but it is a fact of life that some SSH servers are simply buggy 1104 * 1105 * @access public 1106 */ 1107 function sendKEXINITFirst() 1108 { 1109 $this->send_kex_first = true; 1110 } 1111 1112 /** 1113 * Send SSH_MSG_KEXINIT Last 1114 * 1115 * https://tools.ietf.org/html/rfc4253#section-7.1 says "key exchange begins by each sending 1116 * sending the [SSH_MSG_KEXINIT] packet". It does not say which side sends it first. In theory 1117 * it shouldn't matter but it is a fact of life that some SSH servers are simply buggy 1118 * 1119 * @access public 1120 */ 1121 function sendKEXINITLast() 1122 { 1123 $this->send_kex_first = false; 1124 } 1125 1126 /** 1127 * Connect to an SSHv2 server 1128 * 1129 * @return bool 1130 * @access private 1131 */ 1132 function _connect() 1133 { 1134 if ($this->bitmap & self::MASK_CONSTRUCTOR) { 1135 return false; 1136 } 1137 1138 $this->bitmap |= self::MASK_CONSTRUCTOR; 1139 1140 $this->curTimeout = $this->timeout; 1141 1142 $this->last_packet = microtime(true); 1143 1144 if (!is_resource($this->fsock)) { 1145 $start = microtime(true); 1146 // with stream_select a timeout of 0 means that no timeout takes place; 1147 // with fsockopen a timeout of 0 means that you instantly timeout 1148 // to resolve this incompatibility a timeout of 100,000 will be used for fsockopen if timeout is 0 1149 $this->fsock = @fsockopen($this->host, $this->port, $errno, $errstr, $this->curTimeout == 0 ? 100000 : $this->curTimeout); 1150 if (!$this->fsock) { 1151 $host = $this->host . ':' . $this->port; 1152 user_error(rtrim("Cannot connect to $host. Error $errno. $errstr")); 1153 return false; 1154 } 1155 $elapsed = microtime(true) - $start; 1156 1157 if ($this->curTimeout) { 1158 $this->curTimeout-= $elapsed; 1159 if ($this->curTimeout < 0) { 1160 $this->is_timeout = true; 1161 return false; 1162 } 1163 } 1164 } 1165 1166 $this->identifier = $this->_generate_identifier(); 1167 1168 if ($this->send_id_string_first) { 1169 fputs($this->fsock, $this->identifier . "\r\n"); 1170 } 1171 1172 /* According to the SSH2 specs, 1173 1174 "The server MAY send other lines of data before sending the version 1175 string. Each line SHOULD be terminated by a Carriage Return and Line 1176 Feed. Such lines MUST NOT begin with "SSH-", and SHOULD be encoded 1177 in ISO-10646 UTF-8 [RFC3629] (language is not specified). Clients 1178 MUST be able to process such lines." */ 1179 $data = ''; 1180 while (!feof($this->fsock) && !preg_match('#(.*)^(SSH-(\d\.\d+).*)#ms', $data, $matches)) { 1181 $line = ''; 1182 while (true) { 1183 if ($this->curTimeout) { 1184 if ($this->curTimeout < 0) { 1185 $this->is_timeout = true; 1186 return false; 1187 } 1188 $read = array($this->fsock); 1189 $write = $except = null; 1190 $start = microtime(true); 1191 $sec = floor($this->curTimeout); 1192 $usec = 1000000 * ($this->curTimeout - $sec); 1193 // on windows this returns a "Warning: Invalid CRT parameters detected" error 1194 // the !count() is done as a workaround for <https://bugs.php.net/42682> 1195 if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) { 1196 $this->is_timeout = true; 1197 return false; 1198 } 1199 $elapsed = microtime(true) - $start; 1200 $this->curTimeout-= $elapsed; 1201 } 1202 1203 $temp = stream_get_line($this->fsock, 255, "\n"); 1204 if (strlen($temp) == 255) { 1205 continue; 1206 } 1207 1208 $line.= "$temp\n"; 1209 1210 // quoting RFC4253, "Implementers who wish to maintain 1211 // compatibility with older, undocumented versions of this protocol may 1212 // want to process the identification string without expecting the 1213 // presence of the carriage return character for reasons described in 1214 // Section 5 of this document." 1215 1216 //if (substr($line, -2) == "\r\n") { 1217 // break; 1218 //} 1219 1220 break; 1221 } 1222 1223 $data.= $line; 1224 } 1225 1226 if (feof($this->fsock)) { 1227 $this->bitmap = 0; 1228 user_error('Connection closed by server'); 1229 return false; 1230 } 1231 1232 $extra = $matches[1]; 1233 1234 if (defined('NET_SSH2_LOGGING')) { 1235 $this->_append_log('<-', $matches[0]); 1236 $this->_append_log('->', $this->identifier . "\r\n"); 1237 } 1238 1239 $this->server_identifier = trim($temp, "\r\n"); 1240 if (strlen($extra)) { 1241 $this->errors[] = $data; 1242 } 1243 1244 if (version_compare($matches[3], '1.99', '<')) { 1245 user_error("Cannot connect to SSH $matches[3] servers"); 1246 return false; 1247 } 1248 1249 if (!$this->send_id_string_first) { 1250 fputs($this->fsock, $this->identifier . "\r\n"); 1251 } 1252 1253 if (!$this->send_kex_first) { 1254 $response = $this->_get_binary_packet(); 1255 if ($response === false) { 1256 $this->bitmap = 0; 1257 user_error('Connection closed by server'); 1258 return false; 1259 } 1260 1261 if (!strlen($response) || ord($response[0]) != NET_SSH2_MSG_KEXINIT) { 1262 user_error('Expected SSH_MSG_KEXINIT'); 1263 return false; 1264 } 1265 1266 if (!$this->_key_exchange($response)) { 1267 return false; 1268 } 1269 } 1270 1271 if ($this->send_kex_first && !$this->_key_exchange()) { 1272 return false; 1273 } 1274 1275 $this->bitmap|= self::MASK_CONNECTED; 1276 1277 return true; 1278 } 1279 1280 /** 1281 * Generates the SSH identifier 1282 * 1283 * You should overwrite this method in your own class if you want to use another identifier 1284 * 1285 * @access protected 1286 * @return string 1287 */ 1288 function _generate_identifier() 1289 { 1290 $identifier = 'SSH-2.0-phpseclib_2.0'; 1291 1292 $ext = array(); 1293 if (function_exists('sodium_crypto_box_publickey_from_secretkey')) { 1294 $ext[] = 'libsodium'; 1295 } 1296 1297 if (extension_loaded('openssl')) { 1298 $ext[] = 'openssl'; 1299 } elseif (extension_loaded('mcrypt')) { 1300 $ext[] = 'mcrypt'; 1301 } 1302 1303 if (extension_loaded('gmp')) { 1304 $ext[] = 'gmp'; 1305 } elseif (extension_loaded('bcmath')) { 1306 $ext[] = 'bcmath'; 1307 } 1308 1309 if (!empty($ext)) { 1310 $identifier .= ' (' . implode(', ', $ext) . ')'; 1311 } 1312 1313 return $identifier; 1314 } 1315 1316 /** 1317 * Key Exchange 1318 * 1319 * @param string $kexinit_payload_server optional 1320 * @access private 1321 */ 1322 function _key_exchange($kexinit_payload_server = false) 1323 { 1324 $preferred = $this->preferred; 1325 1326 $kex_algorithms = isset($preferred['kex']) ? 1327 $preferred['kex'] : 1328 $this->getSupportedKEXAlgorithms(); 1329 $server_host_key_algorithms = isset($preferred['hostkey']) ? 1330 $preferred['hostkey'] : 1331 $this->getSupportedHostKeyAlgorithms(); 1332 $s2c_encryption_algorithms = isset($preferred['server_to_client']['crypt']) ? 1333 $preferred['server_to_client']['crypt'] : 1334 $this->getSupportedEncryptionAlgorithms(); 1335 $c2s_encryption_algorithms = isset($preferred['client_to_server']['crypt']) ? 1336 $preferred['client_to_server']['crypt'] : 1337 $this->getSupportedEncryptionAlgorithms(); 1338 $s2c_mac_algorithms = isset($preferred['server_to_client']['mac']) ? 1339 $preferred['server_to_client']['mac'] : 1340 $this->getSupportedMACAlgorithms(); 1341 $c2s_mac_algorithms = isset($preferred['client_to_server']['mac']) ? 1342 $preferred['client_to_server']['mac'] : 1343 $this->getSupportedMACAlgorithms(); 1344 $s2c_compression_algorithms = isset($preferred['server_to_client']['comp']) ? 1345 $preferred['server_to_client']['comp'] : 1346 $this->getSupportedCompressionAlgorithms(); 1347 $c2s_compression_algorithms = isset($preferred['client_to_server']['comp']) ? 1348 $preferred['client_to_server']['comp'] : 1349 $this->getSupportedCompressionAlgorithms(); 1350 1351 // some SSH servers have buggy implementations of some of the above algorithms 1352 switch (true) { 1353 case $this->server_identifier == 'SSH-2.0-SSHD': 1354 case substr($this->server_identifier, 0, 13) == 'SSH-2.0-DLINK': 1355 if (!isset($preferred['server_to_client']['mac'])) { 1356 $s2c_mac_algorithms = array_values(array_diff( 1357 $s2c_mac_algorithms, 1358 array('hmac-sha1-96', 'hmac-md5-96') 1359 )); 1360 } 1361 if (!isset($preferred['client_to_server']['mac'])) { 1362 $c2s_mac_algorithms = array_values(array_diff( 1363 $c2s_mac_algorithms, 1364 array('hmac-sha1-96', 'hmac-md5-96') 1365 )); 1366 } 1367 } 1368 1369 $str_kex_algorithms = implode(',', $kex_algorithms); 1370 $str_server_host_key_algorithms = implode(',', $server_host_key_algorithms); 1371 $encryption_algorithms_server_to_client = implode(',', $s2c_encryption_algorithms); 1372 $encryption_algorithms_client_to_server = implode(',', $c2s_encryption_algorithms); 1373 $mac_algorithms_server_to_client = implode(',', $s2c_mac_algorithms); 1374 $mac_algorithms_client_to_server = implode(',', $c2s_mac_algorithms); 1375 $compression_algorithms_server_to_client = implode(',', $s2c_compression_algorithms); 1376 $compression_algorithms_client_to_server = implode(',', $c2s_compression_algorithms); 1377 1378 $client_cookie = Random::string(16); 1379 1380 $kexinit_payload_client = pack( 1381 'Ca*Na*Na*Na*Na*Na*Na*Na*Na*Na*Na*CN', 1382 NET_SSH2_MSG_KEXINIT, 1383 $client_cookie, 1384 strlen($str_kex_algorithms), 1385 $str_kex_algorithms, 1386 strlen($str_server_host_key_algorithms), 1387 $str_server_host_key_algorithms, 1388 strlen($encryption_algorithms_client_to_server), 1389 $encryption_algorithms_client_to_server, 1390 strlen($encryption_algorithms_server_to_client), 1391 $encryption_algorithms_server_to_client, 1392 strlen($mac_algorithms_client_to_server), 1393 $mac_algorithms_client_to_server, 1394 strlen($mac_algorithms_server_to_client), 1395 $mac_algorithms_server_to_client, 1396 strlen($compression_algorithms_client_to_server), 1397 $compression_algorithms_client_to_server, 1398 strlen($compression_algorithms_server_to_client), 1399 $compression_algorithms_server_to_client, 1400 0, 1401 '', 1402 0, 1403 '', 1404 0, 1405 0 1406 ); 1407 1408 if ($this->send_kex_first) { 1409 if (!$this->_send_binary_packet($kexinit_payload_client)) { 1410 return false; 1411 } 1412 1413 $kexinit_payload_server = $this->_get_binary_packet(); 1414 if ($kexinit_payload_server === false) { 1415 $this->bitmap = 0; 1416 user_error('Connection closed by server'); 1417 return false; 1418 } 1419 1420 if (!strlen($kexinit_payload_server) || ord($kexinit_payload_server[0]) != NET_SSH2_MSG_KEXINIT) { 1421 user_error('Expected SSH_MSG_KEXINIT'); 1422 return false; 1423 } 1424 } 1425 1426 $response = $kexinit_payload_server; 1427 $this->_string_shift($response, 1); // skip past the message number (it should be SSH_MSG_KEXINIT) 1428 $server_cookie = $this->_string_shift($response, 16); 1429 1430 if (strlen($response) < 4) { 1431 return false; 1432 } 1433 $temp = unpack('Nlength', $this->_string_shift($response, 4)); 1434 $this->kex_algorithms = explode(',', $this->_string_shift($response, $temp['length'])); 1435 1436 if (strlen($response) < 4) { 1437 return false; 1438 } 1439 $temp = unpack('Nlength', $this->_string_shift($response, 4)); 1440 $this->server_host_key_algorithms = explode(',', $this->_string_shift($response, $temp['length'])); 1441 1442 if (strlen($response) < 4) { 1443 return false; 1444 } 1445 $temp = unpack('Nlength', $this->_string_shift($response, 4)); 1446 $this->encryption_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length'])); 1447 1448 if (strlen($response) < 4) { 1449 return false; 1450 } 1451 $temp = unpack('Nlength', $this->_string_shift($response, 4)); 1452 $this->encryption_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length'])); 1453 1454 if (strlen($response) < 4) { 1455 return false; 1456 } 1457 $temp = unpack('Nlength', $this->_string_shift($response, 4)); 1458 $this->mac_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length'])); 1459 1460 if (strlen($response) < 4) { 1461 return false; 1462 } 1463 $temp = unpack('Nlength', $this->_string_shift($response, 4)); 1464 $this->mac_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length'])); 1465 1466 if (strlen($response) < 4) { 1467 return false; 1468 } 1469 $temp = unpack('Nlength', $this->_string_shift($response, 4)); 1470 $this->compression_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length'])); 1471 1472 if (strlen($response) < 4) { 1473 return false; 1474 } 1475 $temp = unpack('Nlength', $this->_string_shift($response, 4)); 1476 $this->compression_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length'])); 1477 1478 if (strlen($response) < 4) { 1479 return false; 1480 } 1481 $temp = unpack('Nlength', $this->_string_shift($response, 4)); 1482 $this->languages_client_to_server = explode(',', $this->_string_shift($response, $temp['length'])); 1483 1484 if (strlen($response) < 4) { 1485 return false; 1486 } 1487 $temp = unpack('Nlength', $this->_string_shift($response, 4)); 1488 $this->languages_server_to_client = explode(',', $this->_string_shift($response, $temp['length'])); 1489 1490 if (!strlen($response)) { 1491 return false; 1492 } 1493 extract(unpack('Cfirst_kex_packet_follows', $this->_string_shift($response, 1))); 1494 $first_kex_packet_follows = $first_kex_packet_follows != 0; 1495 1496 if (!$this->send_kex_first && !$this->_send_binary_packet($kexinit_payload_client)) { 1497 return false; 1498 } 1499 1500 // we need to decide upon the symmetric encryption algorithms before we do the diffie-hellman key exchange 1501 // we don't initialize any crypto-objects, yet - we do that, later. for now, we need the lengths to make the 1502 // diffie-hellman key exchange as fast as possible 1503 $decrypt = $this->_array_intersect_first($s2c_encryption_algorithms, $this->encryption_algorithms_server_to_client); 1504 $decryptKeyLength = $this->_encryption_algorithm_to_key_size($decrypt); 1505 if ($decryptKeyLength === null) { 1506 user_error('No compatible server to client encryption algorithms found'); 1507 return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); 1508 } 1509 1510 $encrypt = $this->_array_intersect_first($c2s_encryption_algorithms, $this->encryption_algorithms_client_to_server); 1511 $encryptKeyLength = $this->_encryption_algorithm_to_key_size($encrypt); 1512 if ($encryptKeyLength === null) { 1513 user_error('No compatible client to server encryption algorithms found'); 1514 return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); 1515 } 1516 1517 // through diffie-hellman key exchange a symmetric key is obtained 1518 $this->kex_algorithm = $kex_algorithm = $this->_array_intersect_first($kex_algorithms, $this->kex_algorithms); 1519 if ($kex_algorithm === false) { 1520 user_error('No compatible key exchange algorithms found'); 1521 return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); 1522 } 1523 1524 // Only relevant in diffie-hellman-group-exchange-sha{1,256}, otherwise empty. 1525 $exchange_hash_rfc4419 = ''; 1526 1527 if ($kex_algorithm === 'curve25519-sha256@libssh.org') { 1528 $x = Random::string(32); 1529 $eBytes = sodium_crypto_box_publickey_from_secretkey($x); 1530 $clientKexInitMessage = NET_SSH2_MSG_KEX_ECDH_INIT; 1531 $serverKexReplyMessage = NET_SSH2_MSG_KEX_ECDH_REPLY; 1532 $kexHash = new Hash('sha256'); 1533 } else { 1534 if (strpos($kex_algorithm, 'diffie-hellman-group-exchange') === 0) { 1535 $dh_group_sizes_packed = pack( 1536 'NNN', 1537 $this->kex_dh_group_size_min, 1538 $this->kex_dh_group_size_preferred, 1539 $this->kex_dh_group_size_max 1540 ); 1541 $packet = pack( 1542 'Ca*', 1543 NET_SSH2_MSG_KEXDH_GEX_REQUEST, 1544 $dh_group_sizes_packed 1545 ); 1546 if (!$this->_send_binary_packet($packet)) { 1547 return false; 1548 } 1549 1550 $response = $this->_get_binary_packet(); 1551 if ($response === false) { 1552 $this->bitmap = 0; 1553 user_error('Connection closed by server'); 1554 return false; 1555 } 1556 extract(unpack('Ctype', $this->_string_shift($response, 1))); 1557 if ($type != NET_SSH2_MSG_KEXDH_GEX_GROUP) { 1558 user_error('Expected SSH_MSG_KEX_DH_GEX_GROUP'); 1559 return false; 1560 } 1561 1562 if (strlen($response) < 4) { 1563 return false; 1564 } 1565 extract(unpack('NprimeLength', $this->_string_shift($response, 4))); 1566 $primeBytes = $this->_string_shift($response, $primeLength); 1567 $prime = new BigInteger($primeBytes, -256); 1568 1569 if (strlen($response) < 4) { 1570 return false; 1571 } 1572 extract(unpack('NgLength', $this->_string_shift($response, 4))); 1573 $gBytes = $this->_string_shift($response, $gLength); 1574 $g = new BigInteger($gBytes, -256); 1575 1576 $exchange_hash_rfc4419 = pack( 1577 'a*Na*Na*', 1578 $dh_group_sizes_packed, 1579 $primeLength, 1580 $primeBytes, 1581 $gLength, 1582 $gBytes 1583 ); 1584 1585 $clientKexInitMessage = NET_SSH2_MSG_KEXDH_GEX_INIT; 1586 $serverKexReplyMessage = NET_SSH2_MSG_KEXDH_GEX_REPLY; 1587 } else { 1588 switch ($kex_algorithm) { 1589 // see http://tools.ietf.org/html/rfc2409#section-6.2 and 1590 // http://tools.ietf.org/html/rfc2412, appendex E 1591 case 'diffie-hellman-group1-sha1': 1592 $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' . 1593 '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' . 1594 '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' . 1595 'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF'; 1596 break; 1597 // see http://tools.ietf.org/html/rfc3526#section-3 1598 case 'diffie-hellman-group14-sha1': 1599 $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' . 1600 '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' . 1601 '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' . 1602 'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' . 1603 '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' . 1604 '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' . 1605 'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' . 1606 '3995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF'; 1607 break; 1608 } 1609 // For both diffie-hellman-group1-sha1 and diffie-hellman-group14-sha1 1610 // the generator field element is 2 (decimal) and the hash function is sha1. 1611 $g = new BigInteger(2); 1612 $prime = new BigInteger($prime, 16); 1613 $clientKexInitMessage = NET_SSH2_MSG_KEXDH_INIT; 1614 $serverKexReplyMessage = NET_SSH2_MSG_KEXDH_REPLY; 1615 } 1616 1617 switch ($kex_algorithm) { 1618 case 'diffie-hellman-group-exchange-sha256': 1619 $kexHash = new Hash('sha256'); 1620 break; 1621 default: 1622 $kexHash = new Hash('sha1'); 1623 } 1624 1625 /* To increase the speed of the key exchange, both client and server may 1626 reduce the size of their private exponents. It should be at least 1627 twice as long as the key material that is generated from the shared 1628 secret. For more details, see the paper by van Oorschot and Wiener 1629 [VAN-OORSCHOT]. 1630 1631 -- http://tools.ietf.org/html/rfc4419#section-6.2 */ 1632 $one = new BigInteger(1); 1633 $keyLength = min($kexHash->getLength(), max($encryptKeyLength, $decryptKeyLength)); 1634 $max = $one->bitwise_leftShift(16 * $keyLength); // 2 * 8 * $keyLength 1635 $max = $max->subtract($one); 1636 1637 $x = $one->random($one, $max); 1638 $e = $g->modPow($x, $prime); 1639 1640 $eBytes = $e->toBytes(true); 1641 } 1642 $data = pack('CNa*', $clientKexInitMessage, strlen($eBytes), $eBytes); 1643 1644 if (!$this->_send_binary_packet($data)) { 1645 $this->bitmap = 0; 1646 user_error('Connection closed by server'); 1647 return false; 1648 } 1649 1650 $response = $this->_get_binary_packet(); 1651 if ($response === false) { 1652 $this->bitmap = 0; 1653 user_error('Connection closed by server'); 1654 return false; 1655 } 1656 if (!strlen($response)) { 1657 return false; 1658 } 1659 extract(unpack('Ctype', $this->_string_shift($response, 1))); 1660 1661 if ($type != $serverKexReplyMessage) { 1662 user_error('Expected SSH_MSG_KEXDH_REPLY'); 1663 return false; 1664 } 1665 1666 if (strlen($response) < 4) { 1667 return false; 1668 } 1669 $temp = unpack('Nlength', $this->_string_shift($response, 4)); 1670 $this->server_public_host_key = $server_public_host_key = $this->_string_shift($response, $temp['length']); 1671 1672 if (strlen($server_public_host_key) < 4) { 1673 return false; 1674 } 1675 $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4)); 1676 $public_key_format = $this->_string_shift($server_public_host_key, $temp['length']); 1677 1678 if (strlen($response) < 4) { 1679 return false; 1680 } 1681 $temp = unpack('Nlength', $this->_string_shift($response, 4)); 1682 $fBytes = $this->_string_shift($response, $temp['length']); 1683 1684 if (strlen($response) < 4) { 1685 return false; 1686 } 1687 $temp = unpack('Nlength', $this->_string_shift($response, 4)); 1688 $this->signature = $this->_string_shift($response, $temp['length']); 1689 1690 if (strlen($this->signature) < 4) { 1691 return false; 1692 } 1693 $temp = unpack('Nlength', $this->_string_shift($this->signature, 4)); 1694 $this->signature_format = $this->_string_shift($this->signature, $temp['length']); 1695 1696 if ($kex_algorithm === 'curve25519-sha256@libssh.org') { 1697 if (strlen($fBytes) !== 32) { 1698 user_error('Received curve25519 public key of invalid length.'); 1699 return false; 1700 } 1701 $key = new BigInteger(sodium_crypto_scalarmult($x, $fBytes), 256); 1702 sodium_memzero($x); 1703 } else { 1704 $f = new BigInteger($fBytes, -256); 1705 $key = $f->modPow($x, $prime); 1706 } 1707 $keyBytes = $key->toBytes(true); 1708 1709 $this->exchange_hash = pack( 1710 'Na*Na*Na*Na*Na*a*Na*Na*Na*', 1711 strlen($this->identifier), 1712 $this->identifier, 1713 strlen($this->server_identifier), 1714 $this->server_identifier, 1715 strlen($kexinit_payload_client), 1716 $kexinit_payload_client, 1717 strlen($kexinit_payload_server), 1718 $kexinit_payload_server, 1719 strlen($this->server_public_host_key), 1720 $this->server_public_host_key, 1721 $exchange_hash_rfc4419, 1722 strlen($eBytes), 1723 $eBytes, 1724 strlen($fBytes), 1725 $fBytes, 1726 strlen($keyBytes), 1727 $keyBytes 1728 ); 1729 1730 $this->exchange_hash = $kexHash->hash($this->exchange_hash); 1731 1732 if ($this->session_id === false) { 1733 $this->session_id = $this->exchange_hash; 1734 } 1735 1736 $server_host_key_algorithm = $this->_array_intersect_first($server_host_key_algorithms, $this->server_host_key_algorithms); 1737 if ($server_host_key_algorithm === false) { 1738 user_error('No compatible server host key algorithms found'); 1739 return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); 1740 } 1741 1742 switch ($server_host_key_algorithm) { 1743 case 'ssh-dss': 1744 $expected_key_format = 'ssh-dss'; 1745 break; 1746 //case 'rsa-sha2-256': 1747 //case 'rsa-sha2-512': 1748 //case 'ssh-rsa': 1749 default: 1750 $expected_key_format = 'ssh-rsa'; 1751 } 1752 1753 if ($public_key_format != $expected_key_format || $this->signature_format != $server_host_key_algorithm) { 1754 switch (true) { 1755 case $this->signature_format == $server_host_key_algorithm: 1756 case $server_host_key_algorithm != 'rsa-sha2-256' && $server_host_key_algorithm != 'rsa-sha2-512': 1757 case $this->signature_format != 'ssh-rsa': 1758 user_error('Server Host Key Algorithm Mismatch'); 1759 return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); 1760 } 1761 } 1762 1763 $packet = pack( 1764 'C', 1765 NET_SSH2_MSG_NEWKEYS 1766 ); 1767 1768 if (!$this->_send_binary_packet($packet)) { 1769 return false; 1770 } 1771 1772 $response = $this->_get_binary_packet(); 1773 1774 if ($response === false) { 1775 $this->bitmap = 0; 1776 user_error('Connection closed by server'); 1777 return false; 1778 } 1779 1780 if (!strlen($response)) { 1781 return false; 1782 } 1783 extract(unpack('Ctype', $this->_string_shift($response, 1))); 1784 1785 if ($type != NET_SSH2_MSG_NEWKEYS) { 1786 user_error('Expected SSH_MSG_NEWKEYS'); 1787 return false; 1788 } 1789 1790 $keyBytes = pack('Na*', strlen($keyBytes), $keyBytes); 1791 1792 $this->encrypt = $this->_encryption_algorithm_to_crypt_instance($encrypt); 1793 if ($this->encrypt) { 1794 if ($this->crypto_engine) { 1795 $this->encrypt->setPreferredEngine($this->crypto_engine); 1796 } 1797 if ($this->encrypt->block_size) { 1798 $this->encrypt_block_size = $this->encrypt->block_size; 1799 } 1800 $this->encrypt->enableContinuousBuffer(); 1801 $this->encrypt->disablePadding(); 1802 1803 if ($this->encrypt->getBlockLength()) { 1804 $this->encrypt_block_size = $this->encrypt->getBlockLength() >> 3; 1805 } 1806 1807 $iv = $kexHash->hash($keyBytes . $this->exchange_hash . 'A' . $this->session_id); 1808 while ($this->encrypt_block_size > strlen($iv)) { 1809 $iv.= $kexHash->hash($keyBytes . $this->exchange_hash . $iv); 1810 } 1811 $this->encrypt->setIV(substr($iv, 0, $this->encrypt_block_size)); 1812 1813 $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'C' . $this->session_id); 1814 while ($encryptKeyLength > strlen($key)) { 1815 $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key); 1816 } 1817 $this->encrypt->setKey(substr($key, 0, $encryptKeyLength)); 1818 1819 $this->encrypt->name = $decrypt; 1820 } 1821 1822 $this->decrypt = $this->_encryption_algorithm_to_crypt_instance($decrypt); 1823 if ($this->decrypt) { 1824 if ($this->crypto_engine) { 1825 $this->decrypt->setPreferredEngine($this->crypto_engine); 1826 } 1827 if ($this->decrypt->block_size) { 1828 $this->decrypt_block_size = $this->decrypt->block_size; 1829 } 1830 $this->decrypt->enableContinuousBuffer(); 1831 $this->decrypt->disablePadding(); 1832 1833 if ($this->decrypt->getBlockLength()) { 1834 $this->decrypt_block_size = $this->decrypt->getBlockLength() >> 3; 1835 } 1836 1837 $iv = $kexHash->hash($keyBytes . $this->exchange_hash . 'B' . $this->session_id); 1838 while ($this->decrypt_block_size > strlen($iv)) { 1839 $iv.= $kexHash->hash($keyBytes . $this->exchange_hash . $iv); 1840 } 1841 $this->decrypt->setIV(substr($iv, 0, $this->decrypt_block_size)); 1842 1843 $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'D' . $this->session_id); 1844 while ($decryptKeyLength > strlen($key)) { 1845 $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key); 1846 } 1847 $this->decrypt->setKey(substr($key, 0, $decryptKeyLength)); 1848 1849 $this->decrypt->name = $decrypt; 1850 } 1851 1852 /* The "arcfour128" algorithm is the RC4 cipher, as described in 1853 [SCHNEIER], using a 128-bit key. The first 1536 bytes of keystream 1854 generated by the cipher MUST be discarded, and the first byte of the 1855 first encrypted packet MUST be encrypted using the 1537th byte of 1856 keystream. 1857 1858 -- http://tools.ietf.org/html/rfc4345#section-4 */ 1859 if ($encrypt == 'arcfour128' || $encrypt == 'arcfour256') { 1860 $this->encrypt->encrypt(str_repeat("\0", 1536)); 1861 } 1862 if ($decrypt == 'arcfour128' || $decrypt == 'arcfour256') { 1863 $this->decrypt->decrypt(str_repeat("\0", 1536)); 1864 } 1865 1866 $mac_algorithm = $this->_array_intersect_first($c2s_mac_algorithms, $this->mac_algorithms_client_to_server); 1867 if ($mac_algorithm === false) { 1868 user_error('No compatible client to server message authentication algorithms found'); 1869 return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); 1870 } 1871 1872 $createKeyLength = 0; // ie. $mac_algorithm == 'none' 1873 switch ($mac_algorithm) { 1874 case 'hmac-sha2-256': 1875 $this->hmac_create = new Hash('sha256'); 1876 $createKeyLength = 32; 1877 break; 1878 case 'hmac-sha1': 1879 $this->hmac_create = new Hash('sha1'); 1880 $createKeyLength = 20; 1881 break; 1882 case 'hmac-sha1-96': 1883 $this->hmac_create = new Hash('sha1-96'); 1884 $createKeyLength = 20; 1885 break; 1886 case 'hmac-md5': 1887 $this->hmac_create = new Hash('md5'); 1888 $createKeyLength = 16; 1889 break; 1890 case 'hmac-md5-96': 1891 $this->hmac_create = new Hash('md5-96'); 1892 $createKeyLength = 16; 1893 } 1894 $this->hmac_create->name = $mac_algorithm; 1895 1896 $mac_algorithm = $this->_array_intersect_first($s2c_mac_algorithms, $this->mac_algorithms_server_to_client); 1897 if ($mac_algorithm === false) { 1898 user_error('No compatible server to client message authentication algorithms found'); 1899 return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); 1900 } 1901 1902 $checkKeyLength = 0; 1903 $this->hmac_size = 0; 1904 switch ($mac_algorithm) { 1905 case 'hmac-sha2-256': 1906 $this->hmac_check = new Hash('sha256'); 1907 $checkKeyLength = 32; 1908 $this->hmac_size = 32; 1909 break; 1910 case 'hmac-sha1': 1911 $this->hmac_check = new Hash('sha1'); 1912 $checkKeyLength = 20; 1913 $this->hmac_size = 20; 1914 break; 1915 case 'hmac-sha1-96': 1916 $this->hmac_check = new Hash('sha1-96'); 1917 $checkKeyLength = 20; 1918 $this->hmac_size = 12; 1919 break; 1920 case 'hmac-md5': 1921 $this->hmac_check = new Hash('md5'); 1922 $checkKeyLength = 16; 1923 $this->hmac_size = 16; 1924 break; 1925 case 'hmac-md5-96': 1926 $this->hmac_check = new Hash('md5-96'); 1927 $checkKeyLength = 16; 1928 $this->hmac_size = 12; 1929 } 1930 $this->hmac_check->name = $mac_algorithm; 1931 1932 $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'E' . $this->session_id); 1933 while ($createKeyLength > strlen($key)) { 1934 $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key); 1935 } 1936 $this->hmac_create->setKey(substr($key, 0, $createKeyLength)); 1937 1938 $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'F' . $this->session_id); 1939 while ($checkKeyLength > strlen($key)) { 1940 $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key); 1941 } 1942 $this->hmac_check->setKey(substr($key, 0, $checkKeyLength)); 1943 1944 $compression_algorithm = $this->_array_intersect_first($c2s_compression_algorithms, $this->compression_algorithms_client_to_server); 1945 if ($compression_algorithm === false) { 1946 user_error('No compatible client to server compression algorithms found'); 1947 return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); 1948 } 1949 //$this->decompress = $compression_algorithm == 'zlib'; 1950 1951 $compression_algorithm = $this->_array_intersect_first($s2c_compression_algorithms, $this->compression_algorithms_client_to_server); 1952 if ($compression_algorithm === false) { 1953 user_error('No compatible server to client compression algorithms found'); 1954 return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); 1955 } 1956 //$this->compress = $compression_algorithm == 'zlib'; 1957 1958 return true; 1959 } 1960 1961 /** 1962 * Maps an encryption algorithm name to the number of key bytes. 1963 * 1964 * @param string $algorithm Name of the encryption algorithm 1965 * @return int|null Number of bytes as an integer or null for unknown 1966 * @access private 1967 */ 1968 function _encryption_algorithm_to_key_size($algorithm) 1969 { 1970 if ($this->bad_key_size_fix && $this->_bad_algorithm_candidate($algorithm)) { 1971 return 16; 1972 } 1973 1974 switch ($algorithm) { 1975 case 'none': 1976 return 0; 1977 case 'aes128-cbc': 1978 case 'aes128-ctr': 1979 case 'arcfour': 1980 case 'arcfour128': 1981 case 'blowfish-cbc': 1982 case 'blowfish-ctr': 1983 case 'twofish128-cbc': 1984 case 'twofish128-ctr': 1985 return 16; 1986 case '3des-cbc': 1987 case '3des-ctr': 1988 case 'aes192-cbc': 1989 case 'aes192-ctr': 1990 case 'twofish192-cbc': 1991 case 'twofish192-ctr': 1992 return 24; 1993 case 'aes256-cbc': 1994 case 'aes256-ctr': 1995 case 'arcfour256': 1996 case 'twofish-cbc': 1997 case 'twofish256-cbc': 1998 case 'twofish256-ctr': 1999 return 32; 2000 } 2001 return null; 2002 } 2003 2004 /** 2005 * Maps an encryption algorithm name to an instance of a subclass of 2006 * \phpseclib\Crypt\Base. 2007 * 2008 * @param string $algorithm Name of the encryption algorithm 2009 * @return mixed Instance of \phpseclib\Crypt\Base or null for unknown 2010 * @access private 2011 */ 2012 function _encryption_algorithm_to_crypt_instance($algorithm) 2013 { 2014 switch ($algorithm) { 2015 case '3des-cbc': 2016 return new TripleDES(); 2017 case '3des-ctr': 2018 return new TripleDES(Base::MODE_CTR); 2019 case 'aes256-cbc': 2020 case 'aes192-cbc': 2021 case 'aes128-cbc': 2022 return new Rijndael(); 2023 case 'aes256-ctr': 2024 case 'aes192-ctr': 2025 case 'aes128-ctr': 2026 return new Rijndael(Base::MODE_CTR); 2027 case 'blowfish-cbc': 2028 return new Blowfish(); 2029 case 'blowfish-ctr': 2030 return new Blowfish(Base::MODE_CTR); 2031 case 'twofish128-cbc': 2032 case 'twofish192-cbc': 2033 case 'twofish256-cbc': 2034 case 'twofish-cbc': 2035 return new Twofish(); 2036 case 'twofish128-ctr': 2037 case 'twofish192-ctr': 2038 case 'twofish256-ctr': 2039 return new Twofish(Base::MODE_CTR); 2040 case 'arcfour': 2041 case 'arcfour128': 2042 case 'arcfour256': 2043 return new RC4(); 2044 } 2045 return null; 2046 } 2047 2048 /** 2049 * Tests whether or not proposed algorithm has a potential for issues 2050 * 2051 * @link https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/ssh2-aesctr-openssh.html 2052 * @link https://bugzilla.mindrot.org/show_bug.cgi?id=1291 2053 * @param string $algorithm Name of the encryption algorithm 2054 * @return bool 2055 * @access private 2056 */ 2057 function _bad_algorithm_candidate($algorithm) 2058 { 2059 switch ($algorithm) { 2060 case 'arcfour256': 2061 case 'aes192-ctr': 2062 case 'aes256-ctr': 2063 return true; 2064 } 2065 2066 return false; 2067 } 2068 2069 /** 2070 * Login 2071 * 2072 * The $password parameter can be a plaintext password, a \phpseclib\Crypt\RSA object or an array 2073 * 2074 * @param string $username 2075 * @param mixed $password 2076 * @param mixed $... 2077 * @return bool 2078 * @see self::_login() 2079 * @access public 2080 */ 2081 function login($username) 2082 { 2083 $args = func_get_args(); 2084 $this->auth[] = $args; 2085 return call_user_func_array(array(&$this, '_login'), $args); 2086 } 2087 2088 /** 2089 * Login Helper 2090 * 2091 * @param string $username 2092 * @param mixed $password 2093 * @param mixed $... 2094 * @return bool 2095 * @see self::_login_helper() 2096 * @access private 2097 */ 2098 function _login($username) 2099 { 2100 if (!($this->bitmap & self::MASK_CONSTRUCTOR)) { 2101 if (!$this->_connect()) { 2102 return false; 2103 } 2104 } 2105 2106 $args = array_slice(func_get_args(), 1); 2107 if (empty($args)) { 2108 return $this->_login_helper($username); 2109 } 2110 2111 foreach ($args as $arg) { 2112 if ($this->_login_helper($username, $arg)) { 2113 return true; 2114 } 2115 } 2116 return false; 2117 } 2118 2119 /** 2120 * Login Helper 2121 * 2122 * @param string $username 2123 * @param string $password 2124 * @return bool 2125 * @access private 2126 * @internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis} 2127 * by sending dummy SSH_MSG_IGNORE messages. 2128 */ 2129 function _login_helper($username, $password = null) 2130 { 2131 if (!($this->bitmap & self::MASK_CONNECTED)) { 2132 return false; 2133 } 2134 2135 if (!($this->bitmap & self::MASK_LOGIN_REQ)) { 2136 $packet = pack( 2137 'CNa*', 2138 NET_SSH2_MSG_SERVICE_REQUEST, 2139 strlen('ssh-userauth'), 2140 'ssh-userauth' 2141 ); 2142 2143 if (!$this->_send_binary_packet($packet)) { 2144 return false; 2145 } 2146 2147 $response = $this->_get_binary_packet(); 2148 if ($response === false) { 2149 if ($this->retry_connect) { 2150 $this->retry_connect = false; 2151 if (!$this->_connect()) { 2152 return false; 2153 } 2154 return $this->_login_helper($username, $password); 2155 } 2156 $this->bitmap = 0; 2157 user_error('Connection closed by server'); 2158 return false; 2159 } 2160 2161 if (strlen($response) < 4) { 2162 return false; 2163 } 2164 extract(unpack('Ctype', $this->_string_shift($response, 1))); 2165 2166 if ($type != NET_SSH2_MSG_SERVICE_ACCEPT) { 2167 user_error('Expected SSH_MSG_SERVICE_ACCEPT'); 2168 return false; 2169 } 2170 $this->bitmap |= self::MASK_LOGIN_REQ; 2171 } 2172 2173 if (strlen($this->last_interactive_response)) { 2174 return !is_string($password) && !is_array($password) ? false : $this->_keyboard_interactive_process($password); 2175 } 2176 2177 if ($password instanceof RSA) { 2178 return $this->_privatekey_login($username, $password); 2179 } elseif ($password instanceof Agent) { 2180 return $this->_ssh_agent_login($username, $password); 2181 } 2182 2183 if (is_array($password)) { 2184 if ($this->_keyboard_interactive_login($username, $password)) { 2185 $this->bitmap |= self::MASK_LOGIN; 2186 return true; 2187 } 2188 return false; 2189 } 2190 2191 if (!isset($password)) { 2192 $packet = pack( 2193 'CNa*Na*Na*', 2194 NET_SSH2_MSG_USERAUTH_REQUEST, 2195 strlen($username), 2196 $username, 2197 strlen('ssh-connection'), 2198 'ssh-connection', 2199 strlen('none'), 2200 'none' 2201 ); 2202 2203 if (!$this->_send_binary_packet($packet)) { 2204 return false; 2205 } 2206 2207 $response = $this->_get_binary_packet(); 2208 if ($response === false) { 2209 $this->bitmap = 0; 2210 user_error('Connection closed by server'); 2211 return false; 2212 } 2213 2214 if (!strlen($response)) { 2215 return false; 2216 } 2217 extract(unpack('Ctype', $this->_string_shift($response, 1))); 2218 2219 switch ($type) { 2220 case NET_SSH2_MSG_USERAUTH_SUCCESS: 2221 $this->bitmap |= self::MASK_LOGIN; 2222 return true; 2223 //case NET_SSH2_MSG_USERAUTH_FAILURE: 2224 default: 2225 return false; 2226 } 2227 } 2228 2229 $packet = pack( 2230 'CNa*Na*Na*CNa*', 2231 NET_SSH2_MSG_USERAUTH_REQUEST, 2232 strlen($username), 2233 $username, 2234 strlen('ssh-connection'), 2235 'ssh-connection', 2236 strlen('password'), 2237 'password', 2238 0, 2239 strlen($password), 2240 $password 2241 ); 2242 2243 // remove the username and password from the logged packet 2244 if (!defined('NET_SSH2_LOGGING')) { 2245 $logged = null; 2246 } else { 2247 $logged = pack( 2248 'CNa*Na*Na*CNa*', 2249 NET_SSH2_MSG_USERAUTH_REQUEST, 2250 strlen('username'), 2251 'username', 2252 strlen('ssh-connection'), 2253 'ssh-connection', 2254 strlen('password'), 2255 'password', 2256 0, 2257 strlen('password'), 2258 'password' 2259 ); 2260 } 2261 2262 if (!$this->_send_binary_packet($packet, $logged)) { 2263 return false; 2264 } 2265 2266 $response = $this->_get_binary_packet(); 2267 if ($response === false) { 2268 $this->bitmap = 0; 2269 user_error('Connection closed by server'); 2270 return false; 2271 } 2272 2273 if (!strlen($response)) { 2274 return false; 2275 } 2276 extract(unpack('Ctype', $this->_string_shift($response, 1))); 2277 2278 switch ($type) { 2279 case NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ: // in theory, the password can be changed 2280 if (defined('NET_SSH2_LOGGING')) { 2281 $this->message_number_log[count($this->message_number_log) - 1] = 'NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ'; 2282 } 2283 if (strlen($response) < 4) { 2284 return false; 2285 } 2286 extract(unpack('Nlength', $this->_string_shift($response, 4))); 2287 $this->errors[] = 'SSH_MSG_USERAUTH_PASSWD_CHANGEREQ: ' . $this->_string_shift($response, $length); 2288 return $this->_disconnect(NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER); 2289 case NET_SSH2_MSG_USERAUTH_FAILURE: 2290 // can we use keyboard-interactive authentication? if not then either the login is bad or the server employees 2291 // multi-factor authentication 2292 if (strlen($response) < 4) { 2293 return false; 2294 } 2295 extract(unpack('Nlength', $this->_string_shift($response, 4))); 2296 $auth_methods = explode(',', $this->_string_shift($response, $length)); 2297 if (!strlen($response)) { 2298 return false; 2299 } 2300 extract(unpack('Cpartial_success', $this->_string_shift($response, 1))); 2301 $partial_success = $partial_success != 0; 2302 2303 if (!$partial_success && in_array('keyboard-interactive', $auth_methods)) { 2304 if ($this->_keyboard_interactive_login($username, $password)) { 2305 $this->bitmap |= self::MASK_LOGIN; 2306 return true; 2307 } 2308 return false; 2309 } 2310 return false; 2311 case NET_SSH2_MSG_USERAUTH_SUCCESS: 2312 $this->bitmap |= self::MASK_LOGIN; 2313 return true; 2314 } 2315 2316 return false; 2317 } 2318 2319 /** 2320 * Login via keyboard-interactive authentication 2321 * 2322 * See {@link http://tools.ietf.org/html/rfc4256 RFC4256} for details. This is not a full-featured keyboard-interactive authenticator. 2323 * 2324 * @param string $username 2325 * @param string $password 2326 * @return bool 2327 * @access private 2328 */ 2329 function _keyboard_interactive_login($username, $password) 2330 { 2331 $packet = pack( 2332 'CNa*Na*Na*Na*Na*', 2333 NET_SSH2_MSG_USERAUTH_REQUEST, 2334 strlen($username), 2335 $username, 2336 strlen('ssh-connection'), 2337 'ssh-connection', 2338 strlen('keyboard-interactive'), 2339 'keyboard-interactive', 2340 0, 2341 '', 2342 0, 2343 '' 2344 ); 2345 2346 if (!$this->_send_binary_packet($packet)) { 2347 return false; 2348 } 2349 2350 return $this->_keyboard_interactive_process($password); 2351 } 2352 2353 /** 2354 * Handle the keyboard-interactive requests / responses. 2355 * 2356 * @param string $responses... 2357 * @return bool 2358 * @access private 2359 */ 2360 function _keyboard_interactive_process() 2361 { 2362 $responses = func_get_args(); 2363 2364 if (strlen($this->last_interactive_response)) { 2365 $response = $this->last_interactive_response; 2366 } else { 2367 $orig = $response = $this->_get_binary_packet(); 2368 if ($response === false) { 2369 $this->bitmap = 0; 2370 user_error('Connection closed by server'); 2371 return false; 2372 } 2373 } 2374 2375 if (!strlen($response)) { 2376 return false; 2377 } 2378 extract(unpack('Ctype', $this->_string_shift($response, 1))); 2379 2380 switch ($type) { 2381 case NET_SSH2_MSG_USERAUTH_INFO_REQUEST: 2382 if (strlen($response) < 4) { 2383 return false; 2384 } 2385 extract(unpack('Nlength', $this->_string_shift($response, 4))); 2386 $this->_string_shift($response, $length); // name; may be empty 2387 if (strlen($response) < 4) { 2388 return false; 2389 } 2390 extract(unpack('Nlength', $this->_string_shift($response, 4))); 2391 $this->_string_shift($response, $length); // instruction; may be empty 2392 if (strlen($response) < 4) { 2393 return false; 2394 } 2395 extract(unpack('Nlength', $this->_string_shift($response, 4))); 2396 $this->_string_shift($response, $length); // language tag; may be empty 2397 if (strlen($response) < 4) { 2398 return false; 2399 } 2400 extract(unpack('Nnum_prompts', $this->_string_shift($response, 4))); 2401 2402 for ($i = 0; $i < count($responses); $i++) { 2403 if (is_array($responses[$i])) { 2404 foreach ($responses[$i] as $key => $value) { 2405 $this->keyboard_requests_responses[$key] = $value; 2406 } 2407 unset($responses[$i]); 2408 } 2409 } 2410 $responses = array_values($responses); 2411 2412 if (isset($this->keyboard_requests_responses)) { 2413 for ($i = 0; $i < $num_prompts; $i++) { 2414 if (strlen($response) < 4) { 2415 return false; 2416 } 2417 extract(unpack('Nlength', $this->_string_shift($response, 4))); 2418 // prompt - ie. "Password: "; must not be empty 2419 $prompt = $this->_string_shift($response, $length); 2420 //$echo = $this->_string_shift($response) != chr(0); 2421 foreach ($this->keyboard_requests_responses as $key => $value) { 2422 if (substr($prompt, 0, strlen($key)) == $key) { 2423 $responses[] = $value; 2424 break; 2425 } 2426 } 2427 } 2428 } 2429 2430 // see http://tools.ietf.org/html/rfc4256#section-3.2 2431 if (strlen($this->last_interactive_response)) { 2432 $this->last_interactive_response = ''; 2433 } elseif (defined('NET_SSH2_LOGGING')) { 2434 $this->message_number_log[count($this->message_number_log) - 1] = str_replace( 2435 'UNKNOWN', 2436 'NET_SSH2_MSG_USERAUTH_INFO_REQUEST', 2437 $this->message_number_log[count($this->message_number_log) - 1] 2438 ); 2439 } 2440 2441 if (!count($responses) && $num_prompts) { 2442 $this->last_interactive_response = $orig; 2443 return false; 2444 } 2445 2446 /* 2447 After obtaining the requested information from the user, the client 2448 MUST respond with an SSH_MSG_USERAUTH_INFO_RESPONSE message. 2449 */ 2450 // see http://tools.ietf.org/html/rfc4256#section-3.4 2451 $packet = $logged = pack('CN', NET_SSH2_MSG_USERAUTH_INFO_RESPONSE, count($responses)); 2452 for ($i = 0; $i < count($responses); $i++) { 2453 $packet.= pack('Na*', strlen($responses[$i]), $responses[$i]); 2454 $logged.= pack('Na*', strlen('dummy-answer'), 'dummy-answer'); 2455 } 2456 2457 if (!$this->_send_binary_packet($packet, $logged)) { 2458 return false; 2459 } 2460 2461 if (defined('NET_SSH2_LOGGING') && NET_SSH2_LOGGING == self::LOG_COMPLEX) { 2462 $this->message_number_log[count($this->message_number_log) - 1] = str_replace( 2463 'UNKNOWN', 2464 'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE', 2465 $this->message_number_log[count($this->message_number_log) - 1] 2466 ); 2467 } 2468 2469 /* 2470 After receiving the response, the server MUST send either an 2471 SSH_MSG_USERAUTH_SUCCESS, SSH_MSG_USERAUTH_FAILURE, or another 2472 SSH_MSG_USERAUTH_INFO_REQUEST message. 2473 */ 2474 // maybe phpseclib should force close the connection after x request / responses? unless something like that is done 2475 // there could be an infinite loop of request / responses. 2476 return $this->_keyboard_interactive_process(); 2477 case NET_SSH2_MSG_USERAUTH_SUCCESS: 2478 return true; 2479 case NET_SSH2_MSG_USERAUTH_FAILURE: 2480 return false; 2481 } 2482 2483 return false; 2484 } 2485 2486 /** 2487 * Login with an ssh-agent provided key 2488 * 2489 * @param string $username 2490 * @param \phpseclib\System\SSH\Agent $agent 2491 * @return bool 2492 * @access private 2493 */ 2494 function _ssh_agent_login($username, $agent) 2495 { 2496 $this->agent = $agent; 2497 $keys = $agent->requestIdentities(); 2498 foreach ($keys as $key) { 2499 if ($this->_privatekey_login($username, $key)) { 2500 return true; 2501 } 2502 } 2503 2504 return false; 2505 } 2506 2507 /** 2508 * Login with an RSA private key 2509 * 2510 * @param string $username 2511 * @param \phpseclib\Crypt\RSA $password 2512 * @return bool 2513 * @access private 2514 * @internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis} 2515 * by sending dummy SSH_MSG_IGNORE messages. 2516 */ 2517 function _privatekey_login($username, $privatekey) 2518 { 2519 // see http://tools.ietf.org/html/rfc4253#page-15 2520 $publickey = $privatekey->getPublicKey(RSA::PUBLIC_FORMAT_RAW); 2521 if ($publickey === false) { 2522 return false; 2523 } 2524 2525 $publickey = array( 2526 'e' => $publickey['e']->toBytes(true), 2527 'n' => $publickey['n']->toBytes(true) 2528 ); 2529 $publickey = pack( 2530 'Na*Na*Na*', 2531 strlen('ssh-rsa'), 2532 'ssh-rsa', 2533 strlen($publickey['e']), 2534 $publickey['e'], 2535 strlen($publickey['n']), 2536 $publickey['n'] 2537 ); 2538 2539 switch ($this->signature_format) { 2540 case 'rsa-sha2-512': 2541 $hash = 'sha512'; 2542 $signatureType = 'rsa-sha2-512'; 2543 break; 2544 case 'rsa-sha2-256': 2545 $hash = 'sha256'; 2546 $signatureType = 'rsa-sha2-256'; 2547 break; 2548 //case 'ssh-rsa': 2549 default: 2550 $hash = 'sha1'; 2551 $signatureType = 'ssh-rsa'; 2552 } 2553 2554 $part1 = pack( 2555 'CNa*Na*Na*', 2556 NET_SSH2_MSG_USERAUTH_REQUEST, 2557 strlen($username), 2558 $username, 2559 strlen('ssh-connection'), 2560 'ssh-connection', 2561 strlen('publickey'), 2562 'publickey' 2563 ); 2564 $part2 = pack('Na*Na*', strlen($signatureType), $signatureType, strlen($publickey), $publickey); 2565 2566 $packet = $part1 . chr(0) . $part2; 2567 if (!$this->_send_binary_packet($packet)) { 2568 return false; 2569 } 2570 2571 $response = $this->_get_binary_packet(); 2572 if ($response === false) { 2573 $this->bitmap = 0; 2574 user_error('Connection closed by server'); 2575 return false; 2576 } 2577 2578 if (!strlen($response)) { 2579 return false; 2580 } 2581 extract(unpack('Ctype', $this->_string_shift($response, 1))); 2582 2583 switch ($type) { 2584 case NET_SSH2_MSG_USERAUTH_FAILURE: 2585 if (strlen($response) < 4) { 2586 return false; 2587 } 2588 extract(unpack('Nlength', $this->_string_shift($response, 4))); 2589 $this->errors[] = 'SSH_MSG_USERAUTH_FAILURE: ' . $this->_string_shift($response, $length); 2590 return false; 2591 case NET_SSH2_MSG_USERAUTH_PK_OK: 2592 // we'll just take it on faith that the public key blob and the public key algorithm name are as 2593 // they should be 2594 if (defined('NET_SSH2_LOGGING') && NET_SSH2_LOGGING == self::LOG_COMPLEX) { 2595 $this->message_number_log[count($this->message_number_log) - 1] = str_replace( 2596 'UNKNOWN', 2597 'NET_SSH2_MSG_USERAUTH_PK_OK', 2598 $this->message_number_log[count($this->message_number_log) - 1] 2599 ); 2600 } 2601 } 2602 2603 $packet = $part1 . chr(1) . $part2; 2604 $privatekey->setSignatureMode(RSA::SIGNATURE_PKCS1); 2605 $privatekey->setHash($hash); 2606 $signature = $privatekey->sign(pack('Na*a*', strlen($this->session_id), $this->session_id, $packet)); 2607 $signature = pack('Na*Na*', strlen($signatureType), $signatureType, strlen($signature), $signature); 2608 $packet.= pack('Na*', strlen($signature), $signature); 2609 2610 if (!$this->_send_binary_packet($packet)) { 2611 return false; 2612 } 2613 2614 $response = $this->_get_binary_packet(); 2615 if ($response === false) { 2616 $this->bitmap = 0; 2617 user_error('Connection closed by server'); 2618 return false; 2619 } 2620 2621 if (!strlen($response)) { 2622 return false; 2623 } 2624 extract(unpack('Ctype', $this->_string_shift($response, 1))); 2625 2626 switch ($type) { 2627 case NET_SSH2_MSG_USERAUTH_FAILURE: 2628 // either the login is bad or the server employs multi-factor authentication 2629 return false; 2630 case NET_SSH2_MSG_USERAUTH_SUCCESS: 2631 $this->bitmap |= self::MASK_LOGIN; 2632 return true; 2633 } 2634 2635 return false; 2636 } 2637 2638 /** 2639 * Set Timeout 2640 * 2641 * $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. 2642 * Setting $timeout to false or 0 will mean there is no timeout. 2643 * 2644 * @param mixed $timeout 2645 * @access public 2646 */ 2647 function setTimeout($timeout) 2648 { 2649 $this->timeout = $this->curTimeout = $timeout; 2650 } 2651 2652 /** 2653 * Get the output from stdError 2654 * 2655 * @access public 2656 */ 2657 function getStdError() 2658 { 2659 return $this->stdErrorLog; 2660 } 2661 2662 /** 2663 * Execute Command 2664 * 2665 * If $callback is set to false then \phpseclib\Net\SSH2::_get_channel_packet(self::CHANNEL_EXEC) will need to be called manually. 2666 * In all likelihood, this is not a feature you want to be taking advantage of. 2667 * 2668 * @param string $command 2669 * @param Callback $callback 2670 * @return string 2671 * @access public 2672 */ 2673 function exec($command, $callback = null) 2674 { 2675 $this->curTimeout = $this->timeout; 2676 $this->is_timeout = false; 2677 $this->stdErrorLog = ''; 2678 2679 if (!$this->isAuthenticated()) { 2680 return false; 2681 } 2682 2683 if ($this->in_request_pty_exec) { 2684 user_error('If you want to run multiple exec()\'s you will need to disable (and re-enable if appropriate) a PTY for each one.'); 2685 return false; 2686 } 2687 2688 // RFC4254 defines the (client) window size as "bytes the other party can send before it must wait for the window to 2689 // be adjusted". 0x7FFFFFFF is, at 2GB, the max size. technically, it should probably be decremented, but, 2690 // honestly, if you're transferring more than 2GB, you probably shouldn't be using phpseclib, anyway. 2691 // see http://tools.ietf.org/html/rfc4254#section-5.2 for more info 2692 $this->window_size_server_to_client[self::CHANNEL_EXEC] = $this->window_size; 2693 // 0x8000 is the maximum max packet size, per http://tools.ietf.org/html/rfc4253#section-6.1, although since PuTTy 2694 // uses 0x4000, that's what will be used here, as well. 2695 $packet_size = 0x4000; 2696 2697 $packet = pack( 2698 'CNa*N3', 2699 NET_SSH2_MSG_CHANNEL_OPEN, 2700 strlen('session'), 2701 'session', 2702 self::CHANNEL_EXEC, 2703 $this->window_size_server_to_client[self::CHANNEL_EXEC], 2704 $packet_size 2705 ); 2706 2707 if (!$this->_send_binary_packet($packet)) { 2708 return false; 2709 } 2710 2711 $this->channel_status[self::CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_OPEN; 2712 2713 $response = $this->_get_channel_packet(self::CHANNEL_EXEC); 2714 if ($response === false) { 2715 return false; 2716 } 2717 2718 if ($this->request_pty === true) { 2719 $terminal_modes = pack('C', NET_SSH2_TTY_OP_END); 2720 $packet = pack( 2721 'CNNa*CNa*N5a*', 2722 NET_SSH2_MSG_CHANNEL_REQUEST, 2723 $this->server_channels[self::CHANNEL_EXEC], 2724 strlen('pty-req'), 2725 'pty-req', 2726 1, 2727 strlen('vt100'), 2728 'vt100', 2729 $this->windowColumns, 2730 $this->windowRows, 2731 0, 2732 0, 2733 strlen($terminal_modes), 2734 $terminal_modes 2735 ); 2736 2737 if (!$this->_send_binary_packet($packet)) { 2738 return false; 2739 } 2740 2741 $response = $this->_get_binary_packet(); 2742 if ($response === false) { 2743 $this->bitmap = 0; 2744 user_error('Connection closed by server'); 2745 return false; 2746 } 2747 2748 if (!strlen($response)) { 2749 return false; 2750 } 2751 list(, $type) = unpack('C', $this->_string_shift($response, 1)); 2752 2753 switch ($type) { 2754 case NET_SSH2_MSG_CHANNEL_SUCCESS: 2755 break; 2756 case NET_SSH2_MSG_CHANNEL_FAILURE: 2757 default: 2758 user_error('Unable to request pseudo-terminal'); 2759 return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); 2760 } 2761 $this->in_request_pty_exec = true; 2762 } 2763 2764 // sending a pty-req SSH_MSG_CHANNEL_REQUEST message is unnecessary and, in fact, in most cases, slows things 2765 // down. the one place where it might be desirable is if you're doing something like \phpseclib\Net\SSH2::exec('ping localhost &'). 2766 // with a pty-req SSH_MSG_CHANNEL_REQUEST, exec() will return immediately and the ping process will then 2767 // then immediately terminate. without such a request exec() will loop indefinitely. the ping process won't end but 2768 // neither will your script. 2769 2770 // although, in theory, the size of SSH_MSG_CHANNEL_REQUEST could exceed the maximum packet size established by 2771 // SSH_MSG_CHANNEL_OPEN_CONFIRMATION, RFC4254#section-5.1 states that the "maximum packet size" refers to the 2772 // "maximum size of an individual data packet". ie. SSH_MSG_CHANNEL_DATA. RFC4254#section-5.2 corroborates. 2773 $packet = pack( 2774 'CNNa*CNa*', 2775 NET_SSH2_MSG_CHANNEL_REQUEST, 2776 $this->server_channels[self::CHANNEL_EXEC], 2777 strlen('exec'), 2778 'exec', 2779 1, 2780 strlen($command), 2781 $command 2782 ); 2783 if (!$this->_send_binary_packet($packet)) { 2784 return false; 2785 } 2786 2787 $this->channel_status[self::CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_REQUEST; 2788 2789 $response = $this->_get_channel_packet(self::CHANNEL_EXEC); 2790 if ($response === false) { 2791 return false; 2792 } 2793 2794 $this->channel_status[self::CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_DATA; 2795 2796 if ($callback === false || $this->in_request_pty_exec) { 2797 return true; 2798 } 2799 2800 $output = ''; 2801 while (true) { 2802 $temp = $this->_get_channel_packet(self::CHANNEL_EXEC); 2803 switch (true) { 2804 case $temp === true: 2805 return is_callable($callback) ? true : $output; 2806 case $temp === false: 2807 return false; 2808 default: 2809 if (is_callable($callback)) { 2810 if (call_user_func($callback, $temp) === true) { 2811 $this->_close_channel(self::CHANNEL_EXEC); 2812 return true; 2813 } 2814 } else { 2815 $output.= $temp; 2816 } 2817 } 2818 } 2819 } 2820 2821 /** 2822 * Creates an interactive shell 2823 * 2824 * @see self::read() 2825 * @see self::write() 2826 * @return bool 2827 * @access private 2828 */ 2829 function _initShell() 2830 { 2831 if ($this->in_request_pty_exec === true) { 2832 return true; 2833 } 2834 2835 $this->window_size_server_to_client[self::CHANNEL_SHELL] = $this->window_size; 2836 $packet_size = 0x4000; 2837 2838 $packet = pack( 2839 'CNa*N3', 2840 NET_SSH2_MSG_CHANNEL_OPEN, 2841 strlen('session'), 2842 'session', 2843 self::CHANNEL_SHELL, 2844 $this->window_size_server_to_client[self::CHANNEL_SHELL], 2845 $packet_size 2846 ); 2847 2848 if (!$this->_send_binary_packet($packet)) { 2849 return false; 2850 } 2851 2852 $this->channel_status[self::CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_OPEN; 2853 2854 $response = $this->_get_channel_packet(self::CHANNEL_SHELL); 2855 if ($response === false) { 2856 return false; 2857 } 2858 2859 $terminal_modes = pack('C', NET_SSH2_TTY_OP_END); 2860 $packet = pack( 2861 'CNNa*CNa*N5a*', 2862 NET_SSH2_MSG_CHANNEL_REQUEST, 2863 $this->server_channels[self::CHANNEL_SHELL], 2864 strlen('pty-req'), 2865 'pty-req', 2866 1, 2867 strlen('vt100'), 2868 'vt100', 2869 $this->windowColumns, 2870 $this->windowRows, 2871 0, 2872 0, 2873 strlen($terminal_modes), 2874 $terminal_modes 2875 ); 2876 2877 if (!$this->_send_binary_packet($packet)) { 2878 return false; 2879 } 2880 2881 $response = $this->_get_binary_packet(); 2882 if ($response === false) { 2883 $this->bitmap = 0; 2884 user_error('Connection closed by server'); 2885 return false; 2886 } 2887 2888 if (!strlen($response)) { 2889 return false; 2890 } 2891 list(, $type) = unpack('C', $this->_string_shift($response, 1)); 2892 2893 switch ($type) { 2894 case NET_SSH2_MSG_CHANNEL_SUCCESS: 2895 // if a pty can't be opened maybe commands can still be executed 2896 case NET_SSH2_MSG_CHANNEL_FAILURE: 2897 break; 2898 default: 2899 user_error('Unable to request pseudo-terminal'); 2900 return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); 2901 } 2902 2903 $packet = pack( 2904 'CNNa*C', 2905 NET_SSH2_MSG_CHANNEL_REQUEST, 2906 $this->server_channels[self::CHANNEL_SHELL], 2907 strlen('shell'), 2908 'shell', 2909 1 2910 ); 2911 if (!$this->_send_binary_packet($packet)) { 2912 return false; 2913 } 2914 2915 $this->channel_status[self::CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_REQUEST; 2916 2917 $response = $this->_get_channel_packet(self::CHANNEL_SHELL); 2918 if ($response === false) { 2919 return false; 2920 } 2921 2922 $this->channel_status[self::CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_DATA; 2923 2924 $this->bitmap |= self::MASK_SHELL; 2925 2926 return true; 2927 } 2928 2929 /** 2930 * Return the channel to be used with read() / write() 2931 * 2932 * @see self::read() 2933 * @see self::write() 2934 * @return int 2935 * @access public 2936 */ 2937 function _get_interactive_channel() 2938 { 2939 switch (true) { 2940 case $this->in_subsystem: 2941 return self::CHANNEL_SUBSYSTEM; 2942 case $this->in_request_pty_exec: 2943 return self::CHANNEL_EXEC; 2944 default: 2945 return self::CHANNEL_SHELL; 2946 } 2947 } 2948 2949 /** 2950 * Return an available open channel 2951 * 2952 * @return int 2953 * @access public 2954 */ 2955 function _get_open_channel() 2956 { 2957 $channel = self::CHANNEL_EXEC; 2958 do { 2959 if (isset($this->channel_status[$channel]) && $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_OPEN) { 2960 return $channel; 2961 } 2962 } while ($channel++ < self::CHANNEL_SUBSYSTEM); 2963 2964 return false; 2965 } 2966 2967 /** 2968 * Returns the output of an interactive shell 2969 * 2970 * Returns when there's a match for $expect, which can take the form of a string literal or, 2971 * if $mode == self::READ_REGEX, a regular expression. 2972 * 2973 * @see self::write() 2974 * @param string $expect 2975 * @param int $mode 2976 * @return string 2977 * @access public 2978 */ 2979 function read($expect = '', $mode = self::READ_SIMPLE) 2980 { 2981 $this->curTimeout = $this->timeout; 2982 $this->is_timeout = false; 2983 2984 if (!$this->isAuthenticated()) { 2985 user_error('Operation disallowed prior to login()'); 2986 return false; 2987 } 2988 2989 if (!($this->bitmap & self::MASK_SHELL) && !$this->_initShell()) { 2990 user_error('Unable to initiate an interactive shell session'); 2991 return false; 2992 } 2993 2994 $channel = $this->_get_interactive_channel(); 2995 2996 if ($mode == self::READ_NEXT) { 2997 return $this->_get_channel_packet($channel); 2998 } 2999 3000 $match = $expect; 3001 while (true) { 3002 if ($mode == self::READ_REGEX) { 3003 preg_match($expect, substr($this->interactiveBuffer, -1024), $matches); 3004 $match = isset($matches[0]) ? $matches[0] : ''; 3005 } 3006 $pos = strlen($match) ? strpos($this->interactiveBuffer, $match) : false; 3007 if ($pos !== false) { 3008 return $this->_string_shift($this->interactiveBuffer, $pos + strlen($match)); 3009 } 3010 $response = $this->_get_channel_packet($channel); 3011 if (is_bool($response)) { 3012 $this->in_request_pty_exec = false; 3013 return $response ? $this->_string_shift($this->interactiveBuffer, strlen($this->interactiveBuffer)) : false; 3014 } 3015 3016 $this->interactiveBuffer.= $response; 3017 } 3018 } 3019 3020 /** 3021 * Inputs a command into an interactive shell. 3022 * 3023 * @see self::read() 3024 * @param string $cmd 3025 * @return bool 3026 * @access public 3027 */ 3028 function write($cmd) 3029 { 3030 if (!$this->isAuthenticated()) { 3031 user_error('Operation disallowed prior to login()'); 3032 return false; 3033 } 3034 3035 if (!($this->bitmap & self::MASK_SHELL) && !$this->_initShell()) { 3036 user_error('Unable to initiate an interactive shell session'); 3037 return false; 3038 } 3039 3040 return $this->_send_channel_packet($this->_get_interactive_channel(), $cmd); 3041 } 3042 3043 /** 3044 * Start a subsystem. 3045 * 3046 * Right now only one subsystem at a time is supported. To support multiple subsystem's stopSubsystem() could accept 3047 * a string that contained the name of the subsystem, but at that point, only one subsystem of each type could be opened. 3048 * To support multiple subsystem's of the same name maybe it'd be best if startSubsystem() generated a new channel id and 3049 * returns that and then that that was passed into stopSubsystem() but that'll be saved for a future date and implemented 3050 * if there's sufficient demand for such a feature. 3051 * 3052 * @see self::stopSubsystem() 3053 * @param string $subsystem 3054 * @return bool 3055 * @access public 3056 */ 3057 function startSubsystem($subsystem) 3058 { 3059 $this->window_size_server_to_client[self::CHANNEL_SUBSYSTEM] = $this->window_size; 3060 3061 $packet = pack( 3062 'CNa*N3', 3063 NET_SSH2_MSG_CHANNEL_OPEN, 3064 strlen('session'), 3065 'session', 3066 self::CHANNEL_SUBSYSTEM, 3067 $this->window_size, 3068 0x4000 3069 ); 3070 3071 if (!$this->_send_binary_packet($packet)) { 3072 return false; 3073 } 3074 3075 $this->channel_status[self::CHANNEL_SUBSYSTEM] = NET_SSH2_MSG_CHANNEL_OPEN; 3076 3077 $response = $this->_get_channel_packet(self::CHANNEL_SUBSYSTEM); 3078 if ($response === false) { 3079 return false; 3080 } 3081 3082 $packet = pack( 3083 'CNNa*CNa*', 3084 NET_SSH2_MSG_CHANNEL_REQUEST, 3085 $this->server_channels[self::CHANNEL_SUBSYSTEM], 3086 strlen('subsystem'), 3087 'subsystem', 3088 1, 3089 strlen($subsystem), 3090 $subsystem 3091 ); 3092 if (!$this->_send_binary_packet($packet)) { 3093 return false; 3094 } 3095 3096 $this->channel_status[self::CHANNEL_SUBSYSTEM] = NET_SSH2_MSG_CHANNEL_REQUEST; 3097 3098 $response = $this->_get_channel_packet(self::CHANNEL_SUBSYSTEM); 3099 3100 if ($response === false) { 3101 return false; 3102 } 3103 3104 $this->channel_status[self::CHANNEL_SUBSYSTEM] = NET_SSH2_MSG_CHANNEL_DATA; 3105 3106 $this->bitmap |= self::MASK_SHELL; 3107 $this->in_subsystem = true; 3108 3109 return true; 3110 } 3111 3112 /** 3113 * Stops a subsystem. 3114 * 3115 * @see self::startSubsystem() 3116 * @return bool 3117 * @access public 3118 */ 3119 function stopSubsystem() 3120 { 3121 $this->in_subsystem = false; 3122 $this->_close_channel(self::CHANNEL_SUBSYSTEM); 3123 return true; 3124 } 3125 3126 /** 3127 * Closes a channel 3128 * 3129 * If read() timed out you might want to just close the channel and have it auto-restart on the next read() call 3130 * 3131 * @access public 3132 */ 3133 function reset() 3134 { 3135 $this->_close_channel($this->_get_interactive_channel()); 3136 } 3137 3138 /** 3139 * Is timeout? 3140 * 3141 * Did exec() or read() return because they timed out or because they encountered the end? 3142 * 3143 * @access public 3144 */ 3145 function isTimeout() 3146 { 3147 return $this->is_timeout; 3148 } 3149 3150 /** 3151 * Disconnect 3152 * 3153 * @access public 3154 */ 3155 function disconnect() 3156 { 3157 $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); 3158 if (isset($this->realtime_log_file) && is_resource($this->realtime_log_file)) { 3159 fclose($this->realtime_log_file); 3160 } 3161 } 3162 3163 /** 3164 * Destructor. 3165 * 3166 * Will be called, automatically, if you're supporting just PHP5. If you're supporting PHP4, you'll need to call 3167 * disconnect(). 3168 * 3169 * @access public 3170 */ 3171 function __destruct() 3172 { 3173 $this->disconnect(); 3174 } 3175 3176 /** 3177 * Is the connection still active? 3178 * 3179 * @return bool 3180 * @access public 3181 */ 3182 function isConnected() 3183 { 3184 return (bool) ($this->bitmap & self::MASK_CONNECTED); 3185 } 3186 3187 /** 3188 * Have you successfully been logged in? 3189 * 3190 * @return bool 3191 * @access public 3192 */ 3193 function isAuthenticated() 3194 { 3195 return (bool) ($this->bitmap & self::MASK_LOGIN); 3196 } 3197 3198 /** 3199 * Pings a server connection, or tries to reconnect if the connection has gone down 3200 * 3201 * Inspired by http://php.net/manual/en/mysqli.ping.php 3202 * 3203 * @return bool 3204 * @access public 3205 */ 3206 function ping() 3207 { 3208 if (!$this->isAuthenticated()) { 3209 if (!empty($this->auth)) { 3210 return $this->_reconnect(); 3211 } 3212 return false; 3213 } 3214 3215 $this->window_size_server_to_client[self::CHANNEL_KEEP_ALIVE] = $this->window_size; 3216 $packet_size = 0x4000; 3217 $packet = pack( 3218 'CNa*N3', 3219 NET_SSH2_MSG_CHANNEL_OPEN, 3220 strlen('session'), 3221 'session', 3222 self::CHANNEL_KEEP_ALIVE, 3223 $this->window_size_server_to_client[self::CHANNEL_KEEP_ALIVE], 3224 $packet_size 3225 ); 3226 3227 if (!@$this->_send_binary_packet($packet)) { 3228 return $this->_reconnect(); 3229 } 3230 3231 $this->channel_status[self::CHANNEL_KEEP_ALIVE] = NET_SSH2_MSG_CHANNEL_OPEN; 3232 3233 $response = @$this->_get_channel_packet(self::CHANNEL_KEEP_ALIVE); 3234 if ($response !== false) { 3235 $this->_close_channel(self::CHANNEL_KEEP_ALIVE); 3236 return true; 3237 } 3238 3239 return $this->_reconnect(); 3240 } 3241 3242 /** 3243 * In situ reconnect method 3244 * 3245 * @return boolean 3246 * @access private 3247 */ 3248 function _reconnect() 3249 { 3250 $this->_reset_connection(NET_SSH2_DISCONNECT_CONNECTION_LOST); 3251 $this->retry_connect = true; 3252 if (!$this->_connect()) { 3253 return false; 3254 } 3255 foreach ($this->auth as $auth) { 3256 $result = call_user_func_array(array(&$this, 'login'), $auth); 3257 } 3258 return $result; 3259 } 3260 3261 /** 3262 * Resets a connection for re-use 3263 * 3264 * @param int $reason 3265 * @access private 3266 */ 3267 function _reset_connection($reason) 3268 { 3269 $this->_disconnect($reason); 3270 $this->decrypt = $this->encrypt = false; 3271 $this->decrypt_block_size = $this->encrypt_block_size = 8; 3272 $this->hmac_check = $this->hmac_create = false; 3273 $this->hmac_size = false; 3274 $this->session_id = false; 3275 $this->retry_connect = true; 3276 $this->get_seq_no = $this->send_seq_no = 0; 3277 } 3278 3279 /** 3280 * Gets Binary Packets 3281 * 3282 * See '6. Binary Packet Protocol' of rfc4253 for more info. 3283 * 3284 * @see self::_send_binary_packet() 3285 * @return string 3286 * @access private 3287 */ 3288 function _get_binary_packet($skip_channel_filter = false) 3289 { 3290 if (!is_resource($this->fsock) || feof($this->fsock)) { 3291 $this->bitmap = 0; 3292 user_error('Connection closed prematurely'); 3293 return false; 3294 } 3295 3296 $start = microtime(true); 3297 $raw = stream_get_contents($this->fsock, $this->decrypt_block_size); 3298 3299 if (!strlen($raw)) { 3300 return ''; 3301 } 3302 3303 if ($this->decrypt !== false) { 3304 $raw = $this->decrypt->decrypt($raw); 3305 } 3306 if ($raw === false) { 3307 user_error('Unable to decrypt content'); 3308 return false; 3309 } 3310 3311 if (strlen($raw) < 5) { 3312 return false; 3313 } 3314 extract(unpack('Npacket_length/Cpadding_length', $this->_string_shift($raw, 5))); 3315 3316 $remaining_length = $packet_length + 4 - $this->decrypt_block_size; 3317 3318 // quoting <http://tools.ietf.org/html/rfc4253#section-6.1>, 3319 // "implementations SHOULD check that the packet length is reasonable" 3320 // PuTTY uses 0x9000 as the actual max packet size and so to shall we 3321 if ($remaining_length < -$this->decrypt_block_size || $remaining_length > 0x9000 || $remaining_length % $this->decrypt_block_size != 0) { 3322 if (!$this->bad_key_size_fix && $this->_bad_algorithm_candidate($this->decrypt->name) && !($this->bitmap & SSH2::MASK_LOGIN)) { 3323 $this->bad_key_size_fix = true; 3324 $this->_reset_connection(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED); 3325 return false; 3326 } 3327 user_error('Invalid size'); 3328 return false; 3329 } 3330 3331 $buffer = ''; 3332 while ($remaining_length > 0) { 3333 $temp = stream_get_contents($this->fsock, $remaining_length); 3334 if ($temp === false || feof($this->fsock)) { 3335 $this->bitmap = 0; 3336 user_error('Error reading from socket'); 3337 return false; 3338 } 3339 $buffer.= $temp; 3340 $remaining_length-= strlen($temp); 3341 } 3342 3343 $stop = microtime(true); 3344 if (strlen($buffer)) { 3345 $raw.= $this->decrypt !== false ? $this->decrypt->decrypt($buffer) : $buffer; 3346 } 3347 3348 $payload = $this->_string_shift($raw, $packet_length - $padding_length - 1); 3349 $padding = $this->_string_shift($raw, $padding_length); // should leave $raw empty 3350 3351 if ($this->hmac_check !== false) { 3352 $hmac = stream_get_contents($this->fsock, $this->hmac_size); 3353 if ($hmac === false || strlen($hmac) != $this->hmac_size) { 3354 $this->bitmap = 0; 3355 user_error('Error reading socket'); 3356 return false; 3357 } elseif ($hmac != $this->hmac_check->hash(pack('NNCa*', $this->get_seq_no, $packet_length, $padding_length, $payload . $padding))) { 3358 user_error('Invalid HMAC'); 3359 return false; 3360 } 3361 } 3362 3363 //if ($this->decompress) { 3364 // $payload = gzinflate(substr($payload, 2)); 3365 //} 3366 3367 $this->get_seq_no++; 3368 3369 if (defined('NET_SSH2_LOGGING')) { 3370 $current = microtime(true); 3371 $message_number = isset($this->message_numbers[ord($payload[0])]) ? $this->message_numbers[ord($payload[0])] : 'UNKNOWN (' . ord($payload[0]) . ')'; 3372 $message_number = '<- ' . $message_number . 3373 ' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($stop - $start, 4) . 's)'; 3374 $this->_append_log($message_number, $payload); 3375 $this->last_packet = $current; 3376 } 3377 3378 return $this->_filter($payload, $skip_channel_filter); 3379 } 3380 3381 /** 3382 * Filter Binary Packets 3383 * 3384 * Because some binary packets need to be ignored... 3385 * 3386 * @see self::_get_binary_packet() 3387 * @return string 3388 * @access private 3389 */ 3390 function _filter($payload, $skip_channel_filter) 3391 { 3392 switch (ord($payload[0])) { 3393 case NET_SSH2_MSG_DISCONNECT: 3394 $this->_string_shift($payload, 1); 3395 if (strlen($payload) < 8) { 3396 return false; 3397 } 3398 extract(unpack('Nreason_code/Nlength', $this->_string_shift($payload, 8))); 3399 $this->errors[] = 'SSH_MSG_DISCONNECT: ' . $this->disconnect_reasons[$reason_code] . "\r\n" . $this->_string_shift($payload, $length); 3400 $this->bitmap = 0; 3401 return false; 3402 case NET_SSH2_MSG_IGNORE: 3403 $payload = $this->_get_binary_packet($skip_channel_filter); 3404 break; 3405 case NET_SSH2_MSG_DEBUG: 3406 $this->_string_shift($payload, 2); 3407 if (strlen($payload) < 4) { 3408 return false; 3409 } 3410 extract(unpack('Nlength', $this->_string_shift($payload, 4))); 3411 $this->errors[] = 'SSH_MSG_DEBUG: ' . $this->_string_shift($payload, $length); 3412 $payload = $this->_get_binary_packet($skip_channel_filter); 3413 break; 3414 case NET_SSH2_MSG_UNIMPLEMENTED: 3415 return false; 3416 case NET_SSH2_MSG_KEXINIT: 3417 if ($this->session_id !== false) { 3418 $this->send_kex_first = false; 3419 if (!$this->_key_exchange($payload)) { 3420 $this->bitmap = 0; 3421 return false; 3422 } 3423 $payload = $this->_get_binary_packet($skip_channel_filter); 3424 } 3425 } 3426 3427 // 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 3428 if (($this->bitmap & self::MASK_CONNECTED) && !$this->isAuthenticated() && ord($payload[0]) == NET_SSH2_MSG_USERAUTH_BANNER) { 3429 $this->_string_shift($payload, 1); 3430 if (strlen($payload) < 4) { 3431 return false; 3432 } 3433 extract(unpack('Nlength', $this->_string_shift($payload, 4))); 3434 $this->banner_message = $this->_string_shift($payload, $length); 3435 $payload = $this->_get_binary_packet(); 3436 } 3437 3438 // only called when we've already logged in 3439 if (($this->bitmap & self::MASK_CONNECTED) && $this->isAuthenticated()) { 3440 switch (ord($payload[0])) { 3441 case NET_SSH2_MSG_CHANNEL_DATA: 3442 case NET_SSH2_MSG_CHANNEL_EXTENDED_DATA: 3443 case NET_SSH2_MSG_CHANNEL_REQUEST: 3444 case NET_SSH2_MSG_CHANNEL_CLOSE: 3445 case NET_SSH2_MSG_CHANNEL_EOF: 3446 if (!$skip_channel_filter && !empty($this->server_channels)) { 3447 $this->binary_packet_buffer = $payload; 3448 $this->_get_channel_packet(true); 3449 $payload = $this->_get_binary_packet(); 3450 } 3451 break; 3452 case NET_SSH2_MSG_GLOBAL_REQUEST: // see http://tools.ietf.org/html/rfc4254#section-4 3453 if (strlen($payload) < 4) { 3454 return false; 3455 } 3456 extract(unpack('Nlength', $this->_string_shift($payload, 4))); 3457 $this->errors[] = 'SSH_MSG_GLOBAL_REQUEST: ' . $this->_string_shift($payload, $length); 3458 3459 if (!$this->_send_binary_packet(pack('C', NET_SSH2_MSG_REQUEST_FAILURE))) { 3460 return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); 3461 } 3462 3463 $payload = $this->_get_binary_packet($skip_channel_filter); 3464 break; 3465 case NET_SSH2_MSG_CHANNEL_OPEN: // see http://tools.ietf.org/html/rfc4254#section-5.1 3466 $this->_string_shift($payload, 1); 3467 if (strlen($payload) < 4) { 3468 return false; 3469 } 3470 extract(unpack('Nlength', $this->_string_shift($payload, 4))); 3471 $data = $this->_string_shift($payload, $length); 3472 if (strlen($payload) < 4) { 3473 return false; 3474 } 3475 extract(unpack('Nserver_channel', $this->_string_shift($payload, 4))); 3476 switch ($data) { 3477 case 'auth-agent': 3478 case 'auth-agent@openssh.com': 3479 if (isset($this->agent)) { 3480 $new_channel = self::CHANNEL_AGENT_FORWARD; 3481 3482 if (strlen($payload) < 8) { 3483 return false; 3484 } 3485 extract(unpack('Nremote_window_size', $this->_string_shift($payload, 4))); 3486 extract(unpack('Nremote_maximum_packet_size', $this->_string_shift($payload, 4))); 3487 3488 $this->packet_size_client_to_server[$new_channel] = $remote_window_size; 3489 $this->window_size_server_to_client[$new_channel] = $remote_maximum_packet_size; 3490 $this->window_size_client_to_server[$new_channel] = $this->window_size; 3491 3492 $packet_size = 0x4000; 3493 3494 $packet = pack( 3495 'CN4', 3496 NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, 3497 $server_channel, 3498 $new_channel, 3499 $packet_size, 3500 $packet_size 3501 ); 3502 3503 $this->server_channels[$new_channel] = $server_channel; 3504 $this->channel_status[$new_channel] = NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION; 3505 if (!$this->_send_binary_packet($packet)) { 3506 return false; 3507 } 3508 } 3509 break; 3510 default: 3511 $packet = pack( 3512 'CN3a*Na*', 3513 NET_SSH2_MSG_REQUEST_FAILURE, 3514 $server_channel, 3515 NET_SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED, 3516 0, 3517 '', 3518 0, 3519 '' 3520 ); 3521 3522 if (!$this->_send_binary_packet($packet)) { 3523 return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); 3524 } 3525 } 3526 $payload = $this->_get_binary_packet($skip_channel_filter); 3527 break; 3528 case NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST: 3529 $this->_string_shift($payload, 1); 3530 if (strlen($payload) < 8) { 3531 return false; 3532 } 3533 extract(unpack('Nchannel', $this->_string_shift($payload, 4))); 3534 extract(unpack('Nwindow_size', $this->_string_shift($payload, 4))); 3535 $this->window_size_client_to_server[$channel]+= $window_size; 3536 3537 $payload = ($this->bitmap & self::MASK_WINDOW_ADJUST) ? true : $this->_get_binary_packet($skip_channel_filter); 3538 } 3539 } 3540 3541 return $payload; 3542 } 3543 3544 /** 3545 * Enable Quiet Mode 3546 * 3547 * Suppress stderr from output 3548 * 3549 * @access public 3550 */ 3551 function enableQuietMode() 3552 { 3553 $this->quiet_mode = true; 3554 } 3555 3556 /** 3557 * Disable Quiet Mode 3558 * 3559 * Show stderr in output 3560 * 3561 * @access public 3562 */ 3563 function disableQuietMode() 3564 { 3565 $this->quiet_mode = false; 3566 } 3567 3568 /** 3569 * Returns whether Quiet Mode is enabled or not 3570 * 3571 * @see self::enableQuietMode() 3572 * @see self::disableQuietMode() 3573 * @access public 3574 * @return bool 3575 */ 3576 function isQuietModeEnabled() 3577 { 3578 return $this->quiet_mode; 3579 } 3580 3581 /** 3582 * Enable request-pty when using exec() 3583 * 3584 * @access public 3585 */ 3586 function enablePTY() 3587 { 3588 $this->request_pty = true; 3589 } 3590 3591 /** 3592 * Disable request-pty when using exec() 3593 * 3594 * @access public 3595 */ 3596 function disablePTY() 3597 { 3598 if ($this->in_request_pty_exec) { 3599 $this->_close_channel(self::CHANNEL_EXEC); 3600 $this->in_request_pty_exec = false; 3601 } 3602 $this->request_pty = false; 3603 } 3604 3605 /** 3606 * Returns whether request-pty is enabled or not 3607 * 3608 * @see self::enablePTY() 3609 * @see self::disablePTY() 3610 * @access public 3611 * @return bool 3612 */ 3613 function isPTYEnabled() 3614 { 3615 return $this->request_pty; 3616 } 3617 3618 /** 3619 * Gets channel data 3620 * 3621 * Returns the data as a string if it's available and false if not. 3622 * 3623 * @param $client_channel 3624 * @return mixed 3625 * @access private 3626 */ 3627 function _get_channel_packet($client_channel, $skip_extended = false) 3628 { 3629 if (!empty($this->channel_buffers[$client_channel])) { 3630 return array_shift($this->channel_buffers[$client_channel]); 3631 } 3632 3633 while (true) { 3634 if ($this->binary_packet_buffer !== false) { 3635 $response = $this->binary_packet_buffer; 3636 $this->binary_packet_buffer = false; 3637 } else { 3638 $read = array($this->fsock); 3639 $write = $except = null; 3640 3641 if (!$this->curTimeout) { 3642 @stream_select($read, $write, $except, null); 3643 } else { 3644 if ($this->curTimeout < 0) { 3645 $this->is_timeout = true; 3646 return true; 3647 } 3648 3649 $read = array($this->fsock); 3650 $write = $except = null; 3651 3652 $start = microtime(true); 3653 $sec = floor($this->curTimeout); 3654 $usec = 1000000 * ($this->curTimeout - $sec); 3655 // on windows this returns a "Warning: Invalid CRT parameters detected" error 3656 if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) { 3657 $this->is_timeout = true; 3658 if ($client_channel == self::CHANNEL_EXEC && !$this->request_pty) { 3659 $this->_close_channel($client_channel); 3660 } 3661 return true; 3662 } 3663 $elapsed = microtime(true) - $start; 3664 $this->curTimeout-= $elapsed; 3665 } 3666 3667 $response = $this->_get_binary_packet(true); 3668 if ($response === false) { 3669 $this->bitmap = 0; 3670 user_error('Connection closed by server'); 3671 return false; 3672 } 3673 } 3674 3675 if ($client_channel == -1 && $response === true) { 3676 return true; 3677 } 3678 if (!strlen($response)) { 3679 return false; 3680 } 3681 extract(unpack('Ctype', $this->_string_shift($response, 1))); 3682 3683 if (strlen($response) < 4) { 3684 return false; 3685 } 3686 if ($type == NET_SSH2_MSG_CHANNEL_OPEN) { 3687 extract(unpack('Nlength', $this->_string_shift($response, 4))); 3688 } else { 3689 extract(unpack('Nchannel', $this->_string_shift($response, 4))); 3690 } 3691 3692 // will not be setup yet on incoming channel open request 3693 if (isset($channel) && isset($this->channel_status[$channel]) && isset($this->window_size_server_to_client[$channel])) { 3694 $this->window_size_server_to_client[$channel]-= strlen($response); 3695 3696 // resize the window, if appropriate 3697 if ($this->window_size_server_to_client[$channel] < 0) { 3698 $packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$channel], $this->window_size); 3699 if (!$this->_send_binary_packet($packet)) { 3700 return false; 3701 } 3702 $this->window_size_server_to_client[$channel]+= $this->window_size; 3703 } 3704 3705 switch ($type) { 3706 case NET_SSH2_MSG_CHANNEL_EXTENDED_DATA: 3707 /* 3708 if ($client_channel == self::CHANNEL_EXEC) { 3709 $this->_send_channel_packet($client_channel, chr(0)); 3710 } 3711 */ 3712 // currently, there's only one possible value for $data_type_code: NET_SSH2_EXTENDED_DATA_STDERR 3713 if (strlen($response) < 8) { 3714 return false; 3715 } 3716 extract(unpack('Ndata_type_code/Nlength', $this->_string_shift($response, 8))); 3717 $data = $this->_string_shift($response, $length); 3718 $this->stdErrorLog.= $data; 3719 if ($skip_extended || $this->quiet_mode) { 3720 continue 2; 3721 } 3722 if ($client_channel == $channel && $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_DATA) { 3723 return $data; 3724 } 3725 if (!isset($this->channel_buffers[$channel])) { 3726 $this->channel_buffers[$channel] = array(); 3727 } 3728 $this->channel_buffers[$channel][] = $data; 3729 3730 continue 2; 3731 case NET_SSH2_MSG_CHANNEL_REQUEST: 3732 if ($this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_CLOSE) { 3733 continue 2; 3734 } 3735 if (strlen($response) < 4) { 3736 return false; 3737 } 3738 extract(unpack('Nlength', $this->_string_shift($response, 4))); 3739 $value = $this->_string_shift($response, $length); 3740 switch ($value) { 3741 case 'exit-signal': 3742 $this->_string_shift($response, 1); 3743 if (strlen($response) < 4) { 3744 return false; 3745 } 3746 extract(unpack('Nlength', $this->_string_shift($response, 4))); 3747 $this->errors[] = 'SSH_MSG_CHANNEL_REQUEST (exit-signal): ' . $this->_string_shift($response, $length); 3748 $this->_string_shift($response, 1); 3749 if (strlen($response) < 4) { 3750 return false; 3751 } 3752 extract(unpack('Nlength', $this->_string_shift($response, 4))); 3753 if ($length) { 3754 $this->errors[count($this->errors)].= "\r\n" . $this->_string_shift($response, $length); 3755 } 3756 3757 $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_EOF, $this->server_channels[$client_channel])); 3758 $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel])); 3759 3760 $this->channel_status[$channel] = NET_SSH2_MSG_CHANNEL_EOF; 3761 3762 continue 3; 3763 case 'exit-status': 3764 if (strlen($response) < 5) { 3765 return false; 3766 } 3767 extract(unpack('Cfalse/Nexit_status', $this->_string_shift($response, 5))); 3768 $this->exit_status = $exit_status; 3769 3770 // "The client MAY ignore these messages." 3771 // -- http://tools.ietf.org/html/rfc4254#section-6.10 3772 3773 continue 3; 3774 default: 3775 // "Some systems may not implement signals, in which case they SHOULD ignore this message." 3776 // -- http://tools.ietf.org/html/rfc4254#section-6.9 3777 continue 3; 3778 } 3779 } 3780 3781 switch ($this->channel_status[$channel]) { 3782 case NET_SSH2_MSG_CHANNEL_OPEN: 3783 switch ($type) { 3784 case NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION: 3785 if (strlen($response) < 4) { 3786 return false; 3787 } 3788 extract(unpack('Nserver_channel', $this->_string_shift($response, 4))); 3789 $this->server_channels[$channel] = $server_channel; 3790 if (strlen($response) < 4) { 3791 return false; 3792 } 3793 extract(unpack('Nwindow_size', $this->_string_shift($response, 4))); 3794 if ($window_size < 0) { 3795 $window_size&= 0x7FFFFFFF; 3796 $window_size+= 0x80000000; 3797 } 3798 $this->window_size_client_to_server[$channel] = $window_size; 3799 if (strlen($response) < 4) { 3800 return false; 3801 } 3802 $temp = unpack('Npacket_size_client_to_server', $this->_string_shift($response, 4)); 3803 $this->packet_size_client_to_server[$channel] = $temp['packet_size_client_to_server']; 3804 $result = $client_channel == $channel ? true : $this->_get_channel_packet($client_channel, $skip_extended); 3805 $this->_on_channel_open(); 3806 return $result; 3807 //case NET_SSH2_MSG_CHANNEL_OPEN_FAILURE: 3808 default: 3809 user_error('Unable to open channel'); 3810 return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); 3811 } 3812 break; 3813 case NET_SSH2_MSG_CHANNEL_REQUEST: 3814 switch ($type) { 3815 case NET_SSH2_MSG_CHANNEL_SUCCESS: 3816 return true; 3817 case NET_SSH2_MSG_CHANNEL_FAILURE: 3818 return false; 3819 default: 3820 user_error('Unable to fulfill channel request'); 3821 return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); 3822 } 3823 case NET_SSH2_MSG_CHANNEL_CLOSE: 3824 return $type == NET_SSH2_MSG_CHANNEL_CLOSE ? true : $this->_get_channel_packet($client_channel, $skip_extended); 3825 } 3826 } 3827 3828 // ie. $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_DATA 3829 3830 switch ($type) { 3831 case NET_SSH2_MSG_CHANNEL_DATA: 3832 /* 3833 if ($channel == self::CHANNEL_EXEC) { 3834 // SCP requires null packets, such as this, be sent. further, in the case of the ssh.com SSH server 3835 // this actually seems to make things twice as fast. more to the point, the message right after 3836 // SSH_MSG_CHANNEL_DATA (usually SSH_MSG_IGNORE) won't block for as long as it would have otherwise. 3837 // in OpenSSH it slows things down but only by a couple thousandths of a second. 3838 $this->_send_channel_packet($channel, chr(0)); 3839 } 3840 */ 3841 if (strlen($response) < 4) { 3842 return false; 3843 } 3844 extract(unpack('Nlength', $this->_string_shift($response, 4))); 3845 $data = $this->_string_shift($response, $length); 3846 3847 if ($channel == self::CHANNEL_AGENT_FORWARD) { 3848 $agent_response = $this->agent->_forward_data($data); 3849 if (!is_bool($agent_response)) { 3850 $this->_send_channel_packet($channel, $agent_response); 3851 } 3852 break; 3853 } 3854 3855 if ($client_channel == $channel) { 3856 return $data; 3857 } 3858 if (!isset($this->channel_buffers[$channel])) { 3859 $this->channel_buffers[$channel] = array(); 3860 } 3861 $this->channel_buffers[$channel][] = $data; 3862 break; 3863 case NET_SSH2_MSG_CHANNEL_CLOSE: 3864 $this->curTimeout = 0; 3865 3866 if ($this->bitmap & self::MASK_SHELL) { 3867 $this->bitmap&= ~self::MASK_SHELL; 3868 } 3869 if ($this->channel_status[$channel] != NET_SSH2_MSG_CHANNEL_EOF) { 3870 $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel])); 3871 } 3872 3873 $this->channel_status[$channel] = NET_SSH2_MSG_CHANNEL_CLOSE; 3874 if ($client_channel == $channel) { 3875 return true; 3876 } 3877 case NET_SSH2_MSG_CHANNEL_EOF: 3878 break; 3879 default: 3880 user_error('Error reading channel data'); 3881 return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION); 3882 } 3883 } 3884 } 3885 3886 /** 3887 * Sends Binary Packets 3888 * 3889 * See '6. Binary Packet Protocol' of rfc4253 for more info. 3890 * 3891 * @param string $data 3892 * @param string $logged 3893 * @see self::_get_binary_packet() 3894 * @return bool 3895 * @access private 3896 */ 3897 function _send_binary_packet($data, $logged = null) 3898 { 3899 if (!is_resource($this->fsock) || feof($this->fsock)) { 3900 $this->bitmap = 0; 3901 user_error('Connection closed prematurely'); 3902 return false; 3903 } 3904 3905 //if ($this->compress) { 3906 // // the -4 removes the checksum: 3907 // // http://php.net/function.gzcompress#57710 3908 // $data = substr(gzcompress($data), 0, -4); 3909 //} 3910 3911 // 4 (packet length) + 1 (padding length) + 4 (minimal padding amount) == 9 3912 $packet_length = strlen($data) + 9; 3913 // round up to the nearest $this->encrypt_block_size 3914 $packet_length+= (($this->encrypt_block_size - 1) * $packet_length) % $this->encrypt_block_size; 3915 // subtracting strlen($data) is obvious - subtracting 5 is necessary because of packet_length and padding_length 3916 $padding_length = $packet_length - strlen($data) - 5; 3917 $padding = Random::string($padding_length); 3918 3919 // we subtract 4 from packet_length because the packet_length field isn't supposed to include itself 3920 $packet = pack('NCa*', $packet_length - 4, $padding_length, $data . $padding); 3921 3922 $hmac = $this->hmac_create !== false ? $this->hmac_create->hash(pack('Na*', $this->send_seq_no, $packet)) : ''; 3923 $this->send_seq_no++; 3924 3925 if ($this->encrypt !== false) { 3926 $packet = $this->encrypt->encrypt($packet); 3927 } 3928 3929 $packet.= $hmac; 3930 3931 $start = microtime(true); 3932 $result = strlen($packet) == fputs($this->fsock, $packet); 3933 $stop = microtime(true); 3934 3935 if (defined('NET_SSH2_LOGGING')) { 3936 $current = microtime(true); 3937 $message_number = isset($this->message_numbers[ord($data[0])]) ? $this->message_numbers[ord($data[0])] : 'UNKNOWN (' . ord($data[0]) . ')'; 3938 $message_number = '-> ' . $message_number . 3939 ' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($stop - $start, 4) . 's)'; 3940 $this->_append_log($message_number, isset($logged) ? $logged : $data); 3941 $this->last_packet = $current; 3942 } 3943 3944 return $result; 3945 } 3946 3947 /** 3948 * Logs data packets 3949 * 3950 * Makes sure that only the last 1MB worth of packets will be logged 3951 * 3952 * @param string $data 3953 * @access private 3954 */ 3955 function _append_log($message_number, $message) 3956 { 3957 // remove the byte identifying the message type from all but the first two messages (ie. the identification strings) 3958 if (strlen($message_number) > 2) { 3959 $this->_string_shift($message); 3960 } 3961 3962 switch (NET_SSH2_LOGGING) { 3963 // useful for benchmarks 3964 case self::LOG_SIMPLE: 3965 $this->message_number_log[] = $message_number; 3966 break; 3967 // the most useful log for SSH2 3968 case self::LOG_COMPLEX: 3969 $this->message_number_log[] = $message_number; 3970 $this->log_size+= strlen($message); 3971 $this->message_log[] = $message; 3972 while ($this->log_size > self::LOG_MAX_SIZE) { 3973 $this->log_size-= strlen(array_shift($this->message_log)); 3974 array_shift($this->message_number_log); 3975 } 3976 break; 3977 // dump the output out realtime; packets may be interspersed with non packets, 3978 // passwords won't be filtered out and select other packets may not be correctly 3979 // identified 3980 case self::LOG_REALTIME: 3981 switch (PHP_SAPI) { 3982 case 'cli': 3983 $start = $stop = "\r\n"; 3984 break; 3985 default: 3986 $start = '<pre>'; 3987 $stop = '</pre>'; 3988 } 3989 echo $start . $this->_format_log(array($message), array($message_number)) . $stop; 3990 @flush(); 3991 @ob_flush(); 3992 break; 3993 // basically the same thing as self::LOG_REALTIME with the caveat that self::LOG_REALTIME_FILE 3994 // needs to be defined and that the resultant log file will be capped out at self::LOG_MAX_SIZE. 3995 // the earliest part of the log file is denoted by the first <<< START >>> and is not going to necessarily 3996 // at the beginning of the file 3997 case self::LOG_REALTIME_FILE: 3998 if (!isset($this->realtime_log_file)) { 3999 // PHP doesn't seem to like using constants in fopen() 4000 $filename = self::LOG_REALTIME_FILENAME; 4001 $fp = fopen($filename, 'w'); 4002 $this->realtime_log_file = $fp; 4003 } 4004 if (!is_resource($this->realtime_log_file)) { 4005 break; 4006 } 4007 $entry = $this->_format_log(array($message), array($message_number)); 4008 if ($this->realtime_log_wrap) { 4009 $temp = "<<< START >>>\r\n"; 4010 $entry.= $temp; 4011 fseek($this->realtime_log_file, ftell($this->realtime_log_file) - strlen($temp)); 4012 } 4013 $this->realtime_log_size+= strlen($entry); 4014 if ($this->realtime_log_size > self::LOG_MAX_SIZE) { 4015 fseek($this->realtime_log_file, 0); 4016 $this->realtime_log_size = strlen($entry); 4017 $this->realtime_log_wrap = true; 4018 } 4019 fputs($this->realtime_log_file, $entry); 4020 } 4021 } 4022 4023 /** 4024 * Sends channel data 4025 * 4026 * Spans multiple SSH_MSG_CHANNEL_DATAs if appropriate 4027 * 4028 * @param int $client_channel 4029 * @param string $data 4030 * @return bool 4031 * @access private 4032 */ 4033 function _send_channel_packet($client_channel, $data) 4034 { 4035 while (strlen($data)) { 4036 if (!$this->window_size_client_to_server[$client_channel]) { 4037 $this->bitmap^= self::MASK_WINDOW_ADJUST; 4038 // using an invalid channel will let the buffers be built up for the valid channels 4039 $this->_get_channel_packet(-1); 4040 $this->bitmap^= self::MASK_WINDOW_ADJUST; 4041 } 4042 4043 /* The maximum amount of data allowed is determined by the maximum 4044 packet size for the channel, and the current window size, whichever 4045 is smaller. 4046 -- http://tools.ietf.org/html/rfc4254#section-5.2 */ 4047 $max_size = min( 4048 $this->packet_size_client_to_server[$client_channel], 4049 $this->window_size_client_to_server[$client_channel] 4050 ); 4051 4052 $temp = $this->_string_shift($data, $max_size); 4053 $packet = pack( 4054 'CN2a*', 4055 NET_SSH2_MSG_CHANNEL_DATA, 4056 $this->server_channels[$client_channel], 4057 strlen($temp), 4058 $temp 4059 ); 4060 $this->window_size_client_to_server[$client_channel]-= strlen($temp); 4061 if (!$this->_send_binary_packet($packet)) { 4062 return false; 4063 } 4064 } 4065 4066 return true; 4067 } 4068 4069 /** 4070 * Closes and flushes a channel 4071 * 4072 * \phpseclib\Net\SSH2 doesn't properly close most channels. For exec() channels are normally closed by the server 4073 * and for SFTP channels are presumably closed when the client disconnects. This functions is intended 4074 * for SCP more than anything. 4075 * 4076 * @param int $client_channel 4077 * @param bool $want_reply 4078 * @return bool 4079 * @access private 4080 */ 4081 function _close_channel($client_channel, $want_reply = false) 4082 { 4083 // see http://tools.ietf.org/html/rfc4254#section-5.3 4084 4085 $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_EOF, $this->server_channels[$client_channel])); 4086 4087 if (!$want_reply) { 4088 $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$client_channel])); 4089 } 4090 4091 $this->channel_status[$client_channel] = NET_SSH2_MSG_CHANNEL_CLOSE; 4092 4093 $this->curTimeout = 0; 4094 4095 while (!is_bool($this->_get_channel_packet($client_channel))) { 4096 } 4097 4098 if ($want_reply) { 4099 $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$client_channel])); 4100 } 4101 4102 if ($this->bitmap & self::MASK_SHELL) { 4103 $this->bitmap&= ~self::MASK_SHELL; 4104 } 4105 } 4106 4107 /** 4108 * Disconnect 4109 * 4110 * @param int $reason 4111 * @return bool 4112 * @access private 4113 */ 4114 function _disconnect($reason) 4115 { 4116 if ($this->bitmap & self::MASK_CONNECTED) { 4117 $data = pack('CNNa*Na*', NET_SSH2_MSG_DISCONNECT, $reason, 0, '', 0, ''); 4118 $this->_send_binary_packet($data); 4119 } 4120 4121 $this->bitmap = 0; 4122 if (is_resource($this->fsock) && get_resource_type($this->fsock) == 'stream') { 4123 fclose($this->fsock); 4124 } 4125 4126 return false; 4127 } 4128 4129 /** 4130 * String Shift 4131 * 4132 * Inspired by array_shift 4133 * 4134 * @param string $string 4135 * @param int $index 4136 * @return string 4137 * @access private 4138 */ 4139 function _string_shift(&$string, $index = 1) 4140 { 4141 $substr = substr($string, 0, $index); 4142 $string = substr($string, $index); 4143 return $substr; 4144 } 4145 4146 /** 4147 * Define Array 4148 * 4149 * Takes any number of arrays whose indices are integers and whose values are strings and defines a bunch of 4150 * named constants from it, using the value as the name of the constant and the index as the value of the constant. 4151 * If any of the constants that would be defined already exists, none of the constants will be defined. 4152 * 4153 * @param array $array 4154 * @access private 4155 */ 4156 function _define_array() 4157 { 4158 $args = func_get_args(); 4159 foreach ($args as $arg) { 4160 foreach ($arg as $key => $value) { 4161 if (!defined($value)) { 4162 define($value, $key); 4163 } else { 4164 break 2; 4165 } 4166 } 4167 } 4168 } 4169 4170 /** 4171 * Returns a log of the packets that have been sent and received. 4172 * 4173 * Returns a string if NET_SSH2_LOGGING == self::LOG_COMPLEX, an array if NET_SSH2_LOGGING == self::LOG_SIMPLE and false if !defined('NET_SSH2_LOGGING') 4174 * 4175 * @access public 4176 * @return array|false|string 4177 */ 4178 function getLog() 4179 { 4180 if (!defined('NET_SSH2_LOGGING')) { 4181 return false; 4182 } 4183 4184 switch (NET_SSH2_LOGGING) { 4185 case self::LOG_SIMPLE: 4186 return $this->message_number_log; 4187 case self::LOG_COMPLEX: 4188 $log = $this->_format_log($this->message_log, $this->message_number_log); 4189 return PHP_SAPI == 'cli' ? $log : '<pre>' . $log . '</pre>'; 4190 default: 4191 return false; 4192 } 4193 } 4194 4195 /** 4196 * Formats a log for printing 4197 * 4198 * @param array $message_log 4199 * @param array $message_number_log 4200 * @access private 4201 * @return string 4202 */ 4203 function _format_log($message_log, $message_number_log) 4204 { 4205 $output = ''; 4206 for ($i = 0; $i < count($message_log); $i++) { 4207 $output.= $message_number_log[$i] . "\r\n"; 4208 $current_log = $message_log[$i]; 4209 $j = 0; 4210 do { 4211 if (strlen($current_log)) { 4212 $output.= str_pad(dechex($j), 7, '0', STR_PAD_LEFT) . '0 '; 4213 } 4214 $fragment = $this->_string_shift($current_log, $this->log_short_width); 4215 $hex = substr(preg_replace_callback('#.#s', array($this, '_format_log_helper'), $fragment), strlen($this->log_boundary)); 4216 // replace non ASCII printable characters with dots 4217 // http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters 4218 // also replace < with a . since < messes up the output on web browsers 4219 $raw = preg_replace('#[^\x20-\x7E]|<#', '.', $fragment); 4220 $output.= str_pad($hex, $this->log_long_width - $this->log_short_width, ' ') . $raw . "\r\n"; 4221 $j++; 4222 } while (strlen($current_log)); 4223 $output.= "\r\n"; 4224 } 4225 4226 return $output; 4227 } 4228 4229 /** 4230 * Helper function for _format_log 4231 * 4232 * For use with preg_replace_callback() 4233 * 4234 * @param array $matches 4235 * @access private 4236 * @return string 4237 */ 4238 function _format_log_helper($matches) 4239 { 4240 return $this->log_boundary . str_pad(dechex(ord($matches[0])), 2, '0', STR_PAD_LEFT); 4241 } 4242 4243 /** 4244 * Helper function for agent->_on_channel_open() 4245 * 4246 * Used when channels are created to inform agent 4247 * of said channel opening. Must be called after 4248 * channel open confirmation received 4249 * 4250 * @access private 4251 */ 4252 function _on_channel_open() 4253 { 4254 if (isset($this->agent)) { 4255 $this->agent->_on_channel_open($this); 4256 } 4257 } 4258 4259 /** 4260 * Returns the first value of the intersection of two arrays or false if 4261 * the intersection is empty. The order is defined by the first parameter. 4262 * 4263 * @param array $array1 4264 * @param array $array2 4265 * @return mixed False if intersection is empty, else intersected value. 4266 * @access private 4267 */ 4268 function _array_intersect_first($array1, $array2) 4269 { 4270 foreach ($array1 as $value) { 4271 if (in_array($value, $array2)) { 4272 return $value; 4273 } 4274 } 4275 return false; 4276 } 4277 4278 /** 4279 * Returns all errors 4280 * 4281 * @return string[] 4282 * @access public 4283 */ 4284 function getErrors() 4285 { 4286 return $this->errors; 4287 } 4288 4289 /** 4290 * Returns the last error 4291 * 4292 * @return string 4293 * @access public 4294 */ 4295 function getLastError() 4296 { 4297 $count = count($this->errors); 4298 4299 if ($count > 0) { 4300 return $this->errors[$count - 1]; 4301 } 4302 } 4303 4304 /** 4305 * Return the server identification. 4306 * 4307 * @return string 4308 * @access public 4309 */ 4310 function getServerIdentification() 4311 { 4312 $this->_connect(); 4313 4314 return $this->server_identifier; 4315 } 4316 4317 /** 4318 * Return a list of the key exchange algorithms the server supports. 4319 * 4320 * @return array 4321 * @access public 4322 */ 4323 function getKexAlgorithms() 4324 { 4325 $this->_connect(); 4326 4327 return $this->kex_algorithms; 4328 } 4329 4330 /** 4331 * Return a list of the host key (public key) algorithms the server supports. 4332 * 4333 * @return array 4334 * @access public 4335 */ 4336 function getServerHostKeyAlgorithms() 4337 { 4338 $this->_connect(); 4339 4340 return $this->server_host_key_algorithms; 4341 } 4342 4343 /** 4344 * Return a list of the (symmetric key) encryption algorithms the server supports, when receiving stuff from the client. 4345 * 4346 * @return array 4347 * @access public 4348 */ 4349 function getEncryptionAlgorithmsClient2Server() 4350 { 4351 $this->_connect(); 4352 4353 return $this->encryption_algorithms_client_to_server; 4354 } 4355 4356 /** 4357 * Return a list of the (symmetric key) encryption algorithms the server supports, when sending stuff to the client. 4358 * 4359 * @return array 4360 * @access public 4361 */ 4362 function getEncryptionAlgorithmsServer2Client() 4363 { 4364 $this->_connect(); 4365 4366 return $this->encryption_algorithms_server_to_client; 4367 } 4368 4369 /** 4370 * Return a list of the MAC algorithms the server supports, when receiving stuff from the client. 4371 * 4372 * @return array 4373 * @access public 4374 */ 4375 function getMACAlgorithmsClient2Server() 4376 { 4377 $this->_connect(); 4378 4379 return $this->mac_algorithms_client_to_server; 4380 } 4381 4382 /** 4383 * Return a list of the MAC algorithms the server supports, when sending stuff to the client. 4384 * 4385 * @return array 4386 * @access public 4387 */ 4388 function getMACAlgorithmsServer2Client() 4389 { 4390 $this->_connect(); 4391 4392 return $this->mac_algorithms_server_to_client; 4393 } 4394 4395 /** 4396 * Return a list of the compression algorithms the server supports, when receiving stuff from the client. 4397 * 4398 * @return array 4399 * @access public 4400 */ 4401 function getCompressionAlgorithmsClient2Server() 4402 { 4403 $this->_connect(); 4404 4405 return $this->compression_algorithms_client_to_server; 4406 } 4407 4408 /** 4409 * Return a list of the compression algorithms the server supports, when sending stuff to the client. 4410 * 4411 * @return array 4412 * @access public 4413 */ 4414 function getCompressionAlgorithmsServer2Client() 4415 { 4416 $this->_connect(); 4417 4418 return $this->compression_algorithms_server_to_client; 4419 } 4420 4421 /** 4422 * Return a list of the languages the server supports, when sending stuff to the client. 4423 * 4424 * @return array 4425 * @access public 4426 */ 4427 function getLanguagesServer2Client() 4428 { 4429 $this->_connect(); 4430 4431 return $this->languages_server_to_client; 4432 } 4433 4434 /** 4435 * Return a list of the languages the server supports, when receiving stuff from the client. 4436 * 4437 * @return array 4438 * @access public 4439 */ 4440 function getLanguagesClient2Server() 4441 { 4442 $this->_connect(); 4443 4444 return $this->languages_client_to_server; 4445 } 4446 4447 /** 4448 * Returns a list of algorithms the server supports 4449 * 4450 * @return array 4451 * @access public 4452 */ 4453 public function getServerAlgorithms() 4454 { 4455 $this->_connect(); 4456 4457 return array( 4458 'kex' => $this->kex_algorithms, 4459 'hostkey' => $this->server_host_key_algorithms, 4460 'client_to_server' => array( 4461 'crypt' => $this->encryption_algorithms_client_to_server, 4462 'mac' => $this->mac_algorithms_client_to_server, 4463 'comp' => $this->compression_algorithms_client_to_server, 4464 'lang' => $this->languages_client_to_server 4465 ), 4466 'server_to_client' => array( 4467 'crypt' => $this->encryption_algorithms_server_to_client, 4468 'mac' => $this->mac_algorithms_server_to_client, 4469 'comp' => $this->compression_algorithms_server_to_client, 4470 'lang' => $this->languages_server_to_client 4471 ) 4472 ); 4473 } 4474 4475 /** 4476 * Returns a list of KEX algorithms that phpseclib supports 4477 * 4478 * @return array 4479 * @access public 4480 */ 4481 function getSupportedKEXAlgorithms() 4482 { 4483 $kex_algorithms = array( 4484 // Elliptic Curve Diffie-Hellman Key Agreement (ECDH) using 4485 // Curve25519. See doc/curve25519-sha256@libssh.org.txt in the 4486 // libssh repository for more information. 4487 'curve25519-sha256@libssh.org', 4488 4489 'diffie-hellman-group-exchange-sha256',// RFC 4419 4490 'diffie-hellman-group-exchange-sha1', // RFC 4419 4491 4492 // Diffie-Hellman Key Agreement (DH) using integer modulo prime 4493 // groups. 4494 'diffie-hellman-group14-sha1', // REQUIRED 4495 'diffie-hellman-group1-sha1', // REQUIRED 4496 ); 4497 4498 if (!function_exists('sodium_crypto_box_publickey_from_secretkey')) { 4499 $kex_algorithms = array_diff( 4500 $kex_algorithms, 4501 array('curve25519-sha256@libssh.org') 4502 ); 4503 } 4504 4505 return $kex_algorithms; 4506 } 4507 4508 /** 4509 * Returns a list of host key algorithms that phpseclib supports 4510 * 4511 * @return array 4512 * @access public 4513 */ 4514 function getSupportedHostKeyAlgorithms() 4515 { 4516 return array( 4517 'rsa-sha2-256', // RFC 8332 4518 'rsa-sha2-512', // RFC 8332 4519 'ssh-rsa', // RECOMMENDED sign Raw RSA Key 4520 'ssh-dss' // REQUIRED sign Raw DSS Key 4521 ); 4522 } 4523 4524 /** 4525 * Returns a list of symmetric key algorithms that phpseclib supports 4526 * 4527 * @return array 4528 * @access public 4529 */ 4530 function getSupportedEncryptionAlgorithms() 4531 { 4532 $algos = array( 4533 // from <http://tools.ietf.org/html/rfc4345#section-4>: 4534 'arcfour256', 4535 'arcfour128', 4536 4537 //'arcfour', // OPTIONAL the ARCFOUR stream cipher with a 128-bit key 4538 4539 // CTR modes from <http://tools.ietf.org/html/rfc4344#section-4>: 4540 'aes128-ctr', // RECOMMENDED AES (Rijndael) in SDCTR mode, with 128-bit key 4541 'aes192-ctr', // RECOMMENDED AES with 192-bit key 4542 'aes256-ctr', // RECOMMENDED AES with 256-bit key 4543 4544 'twofish128-ctr', // OPTIONAL Twofish in SDCTR mode, with 128-bit key 4545 'twofish192-ctr', // OPTIONAL Twofish with 192-bit key 4546 'twofish256-ctr', // OPTIONAL Twofish with 256-bit key 4547 4548 'aes128-cbc', // RECOMMENDED AES with a 128-bit key 4549 'aes192-cbc', // OPTIONAL AES with a 192-bit key 4550 'aes256-cbc', // OPTIONAL AES in CBC mode, with a 256-bit key 4551 4552 'twofish128-cbc', // OPTIONAL Twofish with a 128-bit key 4553 'twofish192-cbc', // OPTIONAL Twofish with a 192-bit key 4554 'twofish256-cbc', 4555 'twofish-cbc', // OPTIONAL alias for "twofish256-cbc" 4556 // (this is being retained for historical reasons) 4557 4558 'blowfish-ctr', // OPTIONAL Blowfish in SDCTR mode 4559 4560 'blowfish-cbc', // OPTIONAL Blowfish in CBC mode 4561 4562 '3des-ctr', // RECOMMENDED Three-key 3DES in SDCTR mode 4563 4564 '3des-cbc', // REQUIRED three-key 3DES in CBC mode 4565 4566 //'none' // OPTIONAL no encryption; NOT RECOMMENDED 4567 ); 4568 4569 $engines = array( 4570 Base::ENGINE_OPENSSL, 4571 Base::ENGINE_MCRYPT, 4572 Base::ENGINE_INTERNAL 4573 ); 4574 4575 $ciphers = array(); 4576 foreach ($engines as $engine) { 4577 foreach ($algos as $algo) { 4578 $obj = $this->_encryption_algorithm_to_crypt_instance($algo); 4579 if ($obj instanceof Rijndael) { 4580 $obj->setKeyLength(preg_replace('#[^\d]#', '', $algo)); 4581 } 4582 switch ($algo) { 4583 case 'arcfour128': 4584 case 'arcfour256': 4585 if ($engine == Base::ENGINE_INTERNAL) { 4586 $algos = array_diff($algos, array($algo)); 4587 $ciphers[] = $algo; 4588 } else { 4589 continue 2; 4590 } 4591 } 4592 if ($obj->isValidEngine($engine)) { 4593 $algos = array_diff($algos, array($algo)); 4594 $ciphers[] = $algo; 4595 } 4596 } 4597 } 4598 4599 return $ciphers; 4600 } 4601 4602 /** 4603 * Returns a list of MAC algorithms that phpseclib supports 4604 * 4605 * @return array 4606 * @access public 4607 */ 4608 function getSupportedMACAlgorithms() 4609 { 4610 return array( 4611 // from <http://www.ietf.org/rfc/rfc6668.txt>: 4612 'hmac-sha2-256',// RECOMMENDED HMAC-SHA256 (digest length = key length = 32) 4613 4614 'hmac-sha1-96', // RECOMMENDED first 96 bits of HMAC-SHA1 (digest length = 12, key length = 20) 4615 'hmac-sha1', // REQUIRED HMAC-SHA1 (digest length = key length = 20) 4616 'hmac-md5-96', // OPTIONAL first 96 bits of HMAC-MD5 (digest length = 12, key length = 16) 4617 'hmac-md5', // OPTIONAL HMAC-MD5 (digest length = key length = 16) 4618 //'none' // OPTIONAL no MAC; NOT RECOMMENDED 4619 ); 4620 } 4621 4622 /** 4623 * Returns a list of compression algorithms that phpseclib supports 4624 * 4625 * @return array 4626 * @access public 4627 */ 4628 function getSupportedCompressionAlgorithms() 4629 { 4630 return array( 4631 'none' // REQUIRED no compression 4632 //'zlib' // OPTIONAL ZLIB (LZ77) compression 4633 ); 4634 } 4635 4636 /** 4637 * Return list of negotiated algorithms 4638 * 4639 * Uses the same format as https://www.php.net/ssh2-methods-negotiated 4640 * 4641 * @return array 4642 * @access public 4643 */ 4644 function getAlgorithmsNegotiated() 4645 { 4646 $this->_connect(); 4647 4648 return array( 4649 'kex' => $this->kex_algorithm, 4650 'hostkey' => $this->signature_format, 4651 'client_to_server' => array( 4652 'crypt' => $this->encrypt->name, 4653 'mac' => $this->hmac_create->name, 4654 'comp' => 'none', 4655 ), 4656 'server_to_client' => array( 4657 'crypt' => $this->decrypt->name, 4658 'mac' => $this->hmac_check->name, 4659 'comp' => 'none', 4660 ) 4661 ); 4662 } 4663 4664 /** 4665 * Accepts an associative array with up to four parameters as described at 4666 * <https://www.php.net/manual/en/function.ssh2-connect.php> 4667 * 4668 * @param array $methods 4669 * @access public 4670 */ 4671 function setPreferredAlgorithms($methods) 4672 { 4673 $preferred = $methods; 4674 4675 if (isset($preferred['kex'])) { 4676 $preferred['kex'] = array_intersect( 4677 $preferred['kex'], 4678 $this->getSupportedKEXAlgorithms() 4679 ); 4680 } 4681 4682 if (isset($preferred['hostkey'])) { 4683 $preferred['hostkey'] = array_intersect( 4684 $preferred['hostkey'], 4685 $this->getSupportedHostKeyAlgorithms() 4686 ); 4687 } 4688 4689 $keys = array('client_to_server', 'server_to_client'); 4690 foreach ($keys as $key) { 4691 if (isset($preferred[$key])) { 4692 $a = &$preferred[$key]; 4693 if (isset($a['crypt'])) { 4694 $a['crypt'] = array_intersect( 4695 $a['crypt'], 4696 $this->getSupportedEncryptionAlgorithms() 4697 ); 4698 } 4699 if (isset($a['comp'])) { 4700 $a['comp'] = array_intersect( 4701 $a['comp'], 4702 $this->getSupportedCompressionAlgorithms() 4703 ); 4704 } 4705 if (isset($a['mac'])) { 4706 $a['mac'] = array_intersect( 4707