serverloop.c revision 295367
1/* $OpenBSD: serverloop.c,v 1.178 2015/02/20 22:17:21 djm Exp $ */ 2/* 3 * Author: Tatu Ylonen <ylo@cs.hut.fi> 4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 5 * All rights reserved 6 * Server main loop for handling the interactive session. 7 * 8 * As far as I am concerned, the code I have written for this software 9 * can be used freely for any purpose. Any derived versions of this 10 * software must be clearly marked as such, and if the derived work is 11 * incompatible with the protocol description in the RFC file, it must be 12 * called by a name other than "ssh" or "Secure Shell". 13 * 14 * SSH2 support by Markus Friedl. 15 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38#include "includes.h" 39 40#include <sys/param.h> /* MIN MAX */ 41#include <sys/types.h> 42#include <sys/wait.h> 43#include <sys/socket.h> 44#ifdef HAVE_SYS_TIME_H 45# include <sys/time.h> 46#endif 47 48#include <netinet/in.h> 49 50#include <errno.h> 51#include <fcntl.h> 52#include <pwd.h> 53#include <signal.h> 54#include <string.h> 55#include <termios.h> 56#include <unistd.h> 57#include <stdarg.h> 58 59#include "openbsd-compat/sys-queue.h" 60#include "xmalloc.h" 61#include "packet.h" 62#include "buffer.h" 63#include "log.h" 64#include "misc.h" 65#include "servconf.h" 66#include "canohost.h" 67#include "sshpty.h" 68#include "channels.h" 69#include "compat.h" 70#include "ssh1.h" 71#include "ssh2.h" 72#include "key.h" 73#include "cipher.h" 74#include "kex.h" 75#include "hostfile.h" 76#include "auth.h" 77#include "session.h" 78#include "dispatch.h" 79#include "auth-options.h" 80#include "serverloop.h" 81#include "roaming.h" 82#include "ssherr.h" 83 84extern ServerOptions options; 85 86/* XXX */ 87extern Authctxt *the_authctxt; 88extern int use_privsep; 89 90static Buffer stdin_buffer; /* Buffer for stdin data. */ 91static Buffer stdout_buffer; /* Buffer for stdout data. */ 92static Buffer stderr_buffer; /* Buffer for stderr data. */ 93static int fdin; /* Descriptor for stdin (for writing) */ 94static int fdout; /* Descriptor for stdout (for reading); 95 May be same number as fdin. */ 96static int fderr; /* Descriptor for stderr. May be -1. */ 97static long stdin_bytes = 0; /* Number of bytes written to stdin. */ 98static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */ 99static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */ 100static long fdout_bytes = 0; /* Number of stdout bytes read from program. */ 101static int stdin_eof = 0; /* EOF message received from client. */ 102static int fdout_eof = 0; /* EOF encountered reading from fdout. */ 103static int fderr_eof = 0; /* EOF encountered readung from fderr. */ 104static int fdin_is_tty = 0; /* fdin points to a tty. */ 105static int connection_in; /* Connection to client (input). */ 106static int connection_out; /* Connection to client (output). */ 107static int connection_closed = 0; /* Connection to client closed. */ 108static u_int buffer_high; /* "Soft" max buffer size. */ 109static int no_more_sessions = 0; /* Disallow further sessions. */ 110 111/* 112 * This SIGCHLD kludge is used to detect when the child exits. The server 113 * will exit after that, as soon as forwarded connections have terminated. 114 */ 115 116static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */ 117 118/* Cleanup on signals (!use_privsep case only) */ 119static volatile sig_atomic_t received_sigterm = 0; 120 121/* prototypes */ 122static void server_init_dispatch(void); 123 124/* 125 * we write to this pipe if a SIGCHLD is caught in order to avoid 126 * the race between select() and child_terminated 127 */ 128static int notify_pipe[2]; 129static void 130notify_setup(void) 131{ 132 if (pipe(notify_pipe) < 0) { 133 error("pipe(notify_pipe) failed %s", strerror(errno)); 134 } else if ((fcntl(notify_pipe[0], F_SETFD, FD_CLOEXEC) == -1) || 135 (fcntl(notify_pipe[1], F_SETFD, FD_CLOEXEC) == -1)) { 136 error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno)); 137 close(notify_pipe[0]); 138 close(notify_pipe[1]); 139 } else { 140 set_nonblock(notify_pipe[0]); 141 set_nonblock(notify_pipe[1]); 142 return; 143 } 144 notify_pipe[0] = -1; /* read end */ 145 notify_pipe[1] = -1; /* write end */ 146} 147static void 148notify_parent(void) 149{ 150 if (notify_pipe[1] != -1) 151 (void)write(notify_pipe[1], "", 1); 152} 153static void 154notify_prepare(fd_set *readset) 155{ 156 if (notify_pipe[0] != -1) 157 FD_SET(notify_pipe[0], readset); 158} 159static void 160notify_done(fd_set *readset) 161{ 162 char c; 163 164 if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset)) 165 while (read(notify_pipe[0], &c, 1) != -1) 166 debug2("notify_done: reading"); 167} 168 169/*ARGSUSED*/ 170static void 171sigchld_handler(int sig) 172{ 173 int save_errno = errno; 174 child_terminated = 1; 175#ifndef _UNICOS 176 mysignal(SIGCHLD, sigchld_handler); 177#endif 178 notify_parent(); 179 errno = save_errno; 180} 181 182/*ARGSUSED*/ 183static void 184sigterm_handler(int sig) 185{ 186 received_sigterm = sig; 187} 188 189/* 190 * Make packets from buffered stderr data, and buffer it for sending 191 * to the client. 192 */ 193static void 194make_packets_from_stderr_data(void) 195{ 196 u_int len; 197 198 /* Send buffered stderr data to the client. */ 199 while (buffer_len(&stderr_buffer) > 0 && 200 packet_not_very_much_data_to_write()) { 201 len = buffer_len(&stderr_buffer); 202 if (packet_is_interactive()) { 203 if (len > 512) 204 len = 512; 205 } else { 206 /* Keep the packets at reasonable size. */ 207 if (len > packet_get_maxsize()) 208 len = packet_get_maxsize(); 209 } 210 packet_start(SSH_SMSG_STDERR_DATA); 211 packet_put_string(buffer_ptr(&stderr_buffer), len); 212 packet_send(); 213 buffer_consume(&stderr_buffer, len); 214 stderr_bytes += len; 215 } 216} 217 218/* 219 * Make packets from buffered stdout data, and buffer it for sending to the 220 * client. 221 */ 222static void 223make_packets_from_stdout_data(void) 224{ 225 u_int len; 226 227 /* Send buffered stdout data to the client. */ 228 while (buffer_len(&stdout_buffer) > 0 && 229 packet_not_very_much_data_to_write()) { 230 len = buffer_len(&stdout_buffer); 231 if (packet_is_interactive()) { 232 if (len > 512) 233 len = 512; 234 } else { 235 /* Keep the packets at reasonable size. */ 236 if (len > packet_get_maxsize()) 237 len = packet_get_maxsize(); 238 } 239 packet_start(SSH_SMSG_STDOUT_DATA); 240 packet_put_string(buffer_ptr(&stdout_buffer), len); 241 packet_send(); 242 buffer_consume(&stdout_buffer, len); 243 stdout_bytes += len; 244 } 245} 246 247static void 248client_alive_check(void) 249{ 250 int channel_id; 251 252 /* timeout, check to see how many we have had */ 253 if (packet_inc_alive_timeouts() > options.client_alive_count_max) { 254 logit("Timeout, client not responding."); 255 cleanup_exit(255); 256 } 257 258 /* 259 * send a bogus global/channel request with "wantreply", 260 * we should get back a failure 261 */ 262 if ((channel_id = channel_find_open()) == -1) { 263 packet_start(SSH2_MSG_GLOBAL_REQUEST); 264 packet_put_cstring("keepalive@openssh.com"); 265 packet_put_char(1); /* boolean: want reply */ 266 } else { 267 channel_request_start(channel_id, "keepalive@openssh.com", 1); 268 } 269 packet_send(); 270} 271 272/* 273 * Sleep in select() until we can do something. This will initialize the 274 * select masks. Upon return, the masks will indicate which descriptors 275 * have data or can accept data. Optionally, a maximum time can be specified 276 * for the duration of the wait (0 = infinite). 277 */ 278static void 279wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp, 280 u_int *nallocp, u_int64_t max_time_milliseconds) 281{ 282 struct timeval tv, *tvp; 283 int ret; 284 time_t minwait_secs = 0; 285 int client_alive_scheduled = 0; 286 int program_alive_scheduled = 0; 287 288 /* Allocate and update select() masks for channel descriptors. */ 289 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, 290 &minwait_secs, 0); 291 292 if (minwait_secs != 0) 293 max_time_milliseconds = MIN(max_time_milliseconds, 294 (u_int)minwait_secs * 1000); 295 296 /* 297 * if using client_alive, set the max timeout accordingly, 298 * and indicate that this particular timeout was for client 299 * alive by setting the client_alive_scheduled flag. 300 * 301 * this could be randomized somewhat to make traffic 302 * analysis more difficult, but we're not doing it yet. 303 */ 304 if (compat20 && 305 max_time_milliseconds == 0 && options.client_alive_interval) { 306 client_alive_scheduled = 1; 307 max_time_milliseconds = 308 (u_int64_t)options.client_alive_interval * 1000; 309 } 310 311 if (compat20) { 312#if 0 313 /* wrong: bad condition XXX */ 314 if (channel_not_very_much_buffered_data()) 315#endif 316 FD_SET(connection_in, *readsetp); 317 } else { 318 /* 319 * Read packets from the client unless we have too much 320 * buffered stdin or channel data. 321 */ 322 if (buffer_len(&stdin_buffer) < buffer_high && 323 channel_not_very_much_buffered_data()) 324 FD_SET(connection_in, *readsetp); 325 /* 326 * If there is not too much data already buffered going to 327 * the client, try to get some more data from the program. 328 */ 329 if (packet_not_very_much_data_to_write()) { 330 program_alive_scheduled = child_terminated; 331 if (!fdout_eof) 332 FD_SET(fdout, *readsetp); 333 if (!fderr_eof) 334 FD_SET(fderr, *readsetp); 335 } 336 /* 337 * If we have buffered data, try to write some of that data 338 * to the program. 339 */ 340 if (fdin != -1 && buffer_len(&stdin_buffer) > 0) 341 FD_SET(fdin, *writesetp); 342 } 343 notify_prepare(*readsetp); 344 345 /* 346 * If we have buffered packet data going to the client, mark that 347 * descriptor. 348 */ 349 if (packet_have_data_to_write()) 350 FD_SET(connection_out, *writesetp); 351 352 /* 353 * If child has terminated and there is enough buffer space to read 354 * from it, then read as much as is available and exit. 355 */ 356 if (child_terminated && packet_not_very_much_data_to_write()) 357 if (max_time_milliseconds == 0 || client_alive_scheduled) 358 max_time_milliseconds = 100; 359 360 if (max_time_milliseconds == 0) 361 tvp = NULL; 362 else { 363 tv.tv_sec = max_time_milliseconds / 1000; 364 tv.tv_usec = 1000 * (max_time_milliseconds % 1000); 365 tvp = &tv; 366 } 367 368 /* Wait for something to happen, or the timeout to expire. */ 369 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); 370 371 if (ret == -1) { 372 memset(*readsetp, 0, *nallocp); 373 memset(*writesetp, 0, *nallocp); 374 if (errno != EINTR) 375 error("select: %.100s", strerror(errno)); 376 } else { 377 if (ret == 0 && client_alive_scheduled) 378 client_alive_check(); 379 if (!compat20 && program_alive_scheduled && fdin_is_tty) { 380 if (!fdout_eof) 381 FD_SET(fdout, *readsetp); 382 if (!fderr_eof) 383 FD_SET(fderr, *readsetp); 384 } 385 } 386 387 notify_done(*readsetp); 388} 389 390/* 391 * Processes input from the client and the program. Input data is stored 392 * in buffers and processed later. 393 */ 394static void 395process_input(fd_set *readset) 396{ 397 int len; 398 char buf[16384]; 399 400 /* Read and buffer any input data from the client. */ 401 if (FD_ISSET(connection_in, readset)) { 402 int cont = 0; 403 len = roaming_read(connection_in, buf, sizeof(buf), &cont); 404 if (len == 0) { 405 if (cont) 406 return; 407 verbose("Connection closed by %.100s", 408 get_remote_ipaddr()); 409 connection_closed = 1; 410 if (compat20) 411 return; 412 cleanup_exit(255); 413 } else if (len < 0) { 414 if (errno != EINTR && errno != EAGAIN && 415 errno != EWOULDBLOCK) { 416 verbose("Read error from remote host " 417 "%.100s: %.100s", 418 get_remote_ipaddr(), strerror(errno)); 419 cleanup_exit(255); 420 } 421 } else { 422 /* Buffer any received data. */ 423 packet_process_incoming(buf, len); 424 } 425 } 426 if (compat20) 427 return; 428 429 /* Read and buffer any available stdout data from the program. */ 430 if (!fdout_eof && FD_ISSET(fdout, readset)) { 431 errno = 0; 432 len = read(fdout, buf, sizeof(buf)); 433 if (len < 0 && (errno == EINTR || ((errno == EAGAIN || 434 errno == EWOULDBLOCK) && !child_terminated))) { 435 /* do nothing */ 436#ifndef PTY_ZEROREAD 437 } else if (len <= 0) { 438#else 439 } else if ((!isatty(fdout) && len <= 0) || 440 (isatty(fdout) && (len < 0 || (len == 0 && errno != 0)))) { 441#endif 442 fdout_eof = 1; 443 } else { 444 buffer_append(&stdout_buffer, buf, len); 445 fdout_bytes += len; 446 } 447 } 448 /* Read and buffer any available stderr data from the program. */ 449 if (!fderr_eof && FD_ISSET(fderr, readset)) { 450 errno = 0; 451 len = read(fderr, buf, sizeof(buf)); 452 if (len < 0 && (errno == EINTR || ((errno == EAGAIN || 453 errno == EWOULDBLOCK) && !child_terminated))) { 454 /* do nothing */ 455#ifndef PTY_ZEROREAD 456 } else if (len <= 0) { 457#else 458 } else if ((!isatty(fderr) && len <= 0) || 459 (isatty(fderr) && (len < 0 || (len == 0 && errno != 0)))) { 460#endif 461 fderr_eof = 1; 462 } else { 463 buffer_append(&stderr_buffer, buf, len); 464 } 465 } 466} 467 468/* 469 * Sends data from internal buffers to client program stdin. 470 */ 471static void 472process_output(fd_set *writeset) 473{ 474 struct termios tio; 475 u_char *data; 476 u_int dlen; 477 int len; 478 479 /* Write buffered data to program stdin. */ 480 if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) { 481 data = buffer_ptr(&stdin_buffer); 482 dlen = buffer_len(&stdin_buffer); 483 len = write(fdin, data, dlen); 484 if (len < 0 && 485 (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) { 486 /* do nothing */ 487 } else if (len <= 0) { 488 if (fdin != fdout) 489 close(fdin); 490 else 491 shutdown(fdin, SHUT_WR); /* We will no longer send. */ 492 fdin = -1; 493 } else { 494 /* Successful write. */ 495 if (fdin_is_tty && dlen >= 1 && data[0] != '\r' && 496 tcgetattr(fdin, &tio) == 0 && 497 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { 498 /* 499 * Simulate echo to reduce the impact of 500 * traffic analysis 501 */ 502 packet_send_ignore(len); 503 packet_send(); 504 } 505 /* Consume the data from the buffer. */ 506 buffer_consume(&stdin_buffer, len); 507 /* Update the count of bytes written to the program. */ 508 stdin_bytes += len; 509 } 510 } 511 /* Send any buffered packet data to the client. */ 512 if (FD_ISSET(connection_out, writeset)) 513 packet_write_poll(); 514} 515 516/* 517 * Wait until all buffered output has been sent to the client. 518 * This is used when the program terminates. 519 */ 520static void 521drain_output(void) 522{ 523 /* Send any buffered stdout data to the client. */ 524 if (buffer_len(&stdout_buffer) > 0) { 525 packet_start(SSH_SMSG_STDOUT_DATA); 526 packet_put_string(buffer_ptr(&stdout_buffer), 527 buffer_len(&stdout_buffer)); 528 packet_send(); 529 /* Update the count of sent bytes. */ 530 stdout_bytes += buffer_len(&stdout_buffer); 531 } 532 /* Send any buffered stderr data to the client. */ 533 if (buffer_len(&stderr_buffer) > 0) { 534 packet_start(SSH_SMSG_STDERR_DATA); 535 packet_put_string(buffer_ptr(&stderr_buffer), 536 buffer_len(&stderr_buffer)); 537 packet_send(); 538 /* Update the count of sent bytes. */ 539 stderr_bytes += buffer_len(&stderr_buffer); 540 } 541 /* Wait until all buffered data has been written to the client. */ 542 packet_write_wait(); 543} 544 545static void 546process_buffered_input_packets(void) 547{ 548 dispatch_run(DISPATCH_NONBLOCK, NULL, active_state); 549} 550 551/* 552 * Performs the interactive session. This handles data transmission between 553 * the client and the program. Note that the notion of stdin, stdout, and 554 * stderr in this function is sort of reversed: this function writes to 555 * stdin (of the child program), and reads from stdout and stderr (of the 556 * child program). 557 */ 558void 559server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg) 560{ 561 fd_set *readset = NULL, *writeset = NULL; 562 int max_fd = 0; 563 u_int nalloc = 0; 564 int wait_status; /* Status returned by wait(). */ 565 pid_t wait_pid; /* pid returned by wait(). */ 566 int waiting_termination = 0; /* Have displayed waiting close message. */ 567 u_int64_t max_time_milliseconds; 568 u_int previous_stdout_buffer_bytes; 569 u_int stdout_buffer_bytes; 570 int type; 571 572 debug("Entering interactive session."); 573 574 /* Initialize the SIGCHLD kludge. */ 575 child_terminated = 0; 576 mysignal(SIGCHLD, sigchld_handler); 577 578 if (!use_privsep) { 579 signal(SIGTERM, sigterm_handler); 580 signal(SIGINT, sigterm_handler); 581 signal(SIGQUIT, sigterm_handler); 582 } 583 584 /* Initialize our global variables. */ 585 fdin = fdin_arg; 586 fdout = fdout_arg; 587 fderr = fderr_arg; 588 589 /* nonblocking IO */ 590 set_nonblock(fdin); 591 set_nonblock(fdout); 592 /* we don't have stderr for interactive terminal sessions, see below */ 593 if (fderr != -1) 594 set_nonblock(fderr); 595 596 if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin)) 597 fdin_is_tty = 1; 598 599 connection_in = packet_get_connection_in(); 600 connection_out = packet_get_connection_out(); 601 602 notify_setup(); 603 604 previous_stdout_buffer_bytes = 0; 605 606 /* Set approximate I/O buffer size. */ 607 if (packet_is_interactive()) 608 buffer_high = 4096; 609 else 610 buffer_high = 64 * 1024; 611 612#if 0 613 /* Initialize max_fd to the maximum of the known file descriptors. */ 614 max_fd = MAX(connection_in, connection_out); 615 max_fd = MAX(max_fd, fdin); 616 max_fd = MAX(max_fd, fdout); 617 if (fderr != -1) 618 max_fd = MAX(max_fd, fderr); 619#endif 620 621 /* Initialize Initialize buffers. */ 622 buffer_init(&stdin_buffer); 623 buffer_init(&stdout_buffer); 624 buffer_init(&stderr_buffer); 625 626 /* 627 * If we have no separate fderr (which is the case when we have a pty 628 * - there we cannot make difference between data sent to stdout and 629 * stderr), indicate that we have seen an EOF from stderr. This way 630 * we don't need to check the descriptor everywhere. 631 */ 632 if (fderr == -1) 633 fderr_eof = 1; 634 635 server_init_dispatch(); 636 637 /* Main loop of the server for the interactive session mode. */ 638 for (;;) { 639 640 /* Process buffered packets from the client. */ 641 process_buffered_input_packets(); 642 643 /* 644 * If we have received eof, and there is no more pending 645 * input data, cause a real eof by closing fdin. 646 */ 647 if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) { 648 if (fdin != fdout) 649 close(fdin); 650 else 651 shutdown(fdin, SHUT_WR); /* We will no longer send. */ 652 fdin = -1; 653 } 654 /* Make packets from buffered stderr data to send to the client. */ 655 make_packets_from_stderr_data(); 656 657 /* 658 * Make packets from buffered stdout data to send to the 659 * client. If there is very little to send, this arranges to 660 * not send them now, but to wait a short while to see if we 661 * are getting more data. This is necessary, as some systems 662 * wake up readers from a pty after each separate character. 663 */ 664 max_time_milliseconds = 0; 665 stdout_buffer_bytes = buffer_len(&stdout_buffer); 666 if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 && 667 stdout_buffer_bytes != previous_stdout_buffer_bytes) { 668 /* try again after a while */ 669 max_time_milliseconds = 10; 670 } else { 671 /* Send it now. */ 672 make_packets_from_stdout_data(); 673 } 674 previous_stdout_buffer_bytes = buffer_len(&stdout_buffer); 675 676 /* Send channel data to the client. */ 677 if (packet_not_very_much_data_to_write()) 678 channel_output_poll(); 679 680 /* 681 * Bail out of the loop if the program has closed its output 682 * descriptors, and we have no more data to send to the 683 * client, and there is no pending buffered data. 684 */ 685 if (fdout_eof && fderr_eof && !packet_have_data_to_write() && 686 buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) { 687 if (!channel_still_open()) 688 break; 689 if (!waiting_termination) { 690 const char *s = "Waiting for forwarded connections to terminate...\r\n"; 691 char *cp; 692 waiting_termination = 1; 693 buffer_append(&stderr_buffer, s, strlen(s)); 694 695 /* Display list of open channels. */ 696 cp = channel_open_message(); 697 buffer_append(&stderr_buffer, cp, strlen(cp)); 698 free(cp); 699 } 700 } 701 max_fd = MAX(connection_in, connection_out); 702 max_fd = MAX(max_fd, fdin); 703 max_fd = MAX(max_fd, fdout); 704 max_fd = MAX(max_fd, fderr); 705 max_fd = MAX(max_fd, notify_pipe[0]); 706 707 /* Sleep in select() until we can do something. */ 708 wait_until_can_do_something(&readset, &writeset, &max_fd, 709 &nalloc, max_time_milliseconds); 710 711 if (received_sigterm) { 712 logit("Exiting on signal %d", (int)received_sigterm); 713 /* Clean up sessions, utmp, etc. */ 714 cleanup_exit(255); 715 } 716 717 /* Process any channel events. */ 718 channel_after_select(readset, writeset); 719 720 /* Process input from the client and from program stdout/stderr. */ 721 process_input(readset); 722 723 /* Process output to the client and to program stdin. */ 724 process_output(writeset); 725 } 726 free(readset); 727 free(writeset); 728 729 /* Cleanup and termination code. */ 730 731 /* Wait until all output has been sent to the client. */ 732 drain_output(); 733 734 debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.", 735 stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes); 736 737 /* Free and clear the buffers. */ 738 buffer_free(&stdin_buffer); 739 buffer_free(&stdout_buffer); 740 buffer_free(&stderr_buffer); 741 742 /* Close the file descriptors. */ 743 if (fdout != -1) 744 close(fdout); 745 fdout = -1; 746 fdout_eof = 1; 747 if (fderr != -1) 748 close(fderr); 749 fderr = -1; 750 fderr_eof = 1; 751 if (fdin != -1) 752 close(fdin); 753 fdin = -1; 754 755 channel_free_all(); 756 757 /* We no longer want our SIGCHLD handler to be called. */ 758 mysignal(SIGCHLD, SIG_DFL); 759 760 while ((wait_pid = waitpid(-1, &wait_status, 0)) < 0) 761 if (errno != EINTR) 762 packet_disconnect("wait: %.100s", strerror(errno)); 763 if (wait_pid != pid) 764 error("Strange, wait returned pid %ld, expected %ld", 765 (long)wait_pid, (long)pid); 766 767 /* Check if it exited normally. */ 768 if (WIFEXITED(wait_status)) { 769 /* Yes, normal exit. Get exit status and send it to the client. */ 770 debug("Command exited with status %d.", WEXITSTATUS(wait_status)); 771 packet_start(SSH_SMSG_EXITSTATUS); 772 packet_put_int(WEXITSTATUS(wait_status)); 773 packet_send(); 774 packet_write_wait(); 775 776 /* 777 * Wait for exit confirmation. Note that there might be 778 * other packets coming before it; however, the program has 779 * already died so we just ignore them. The client is 780 * supposed to respond with the confirmation when it receives 781 * the exit status. 782 */ 783 do { 784 type = packet_read(); 785 } 786 while (type != SSH_CMSG_EXIT_CONFIRMATION); 787 788 debug("Received exit confirmation."); 789 return; 790 } 791 /* Check if the program terminated due to a signal. */ 792 if (WIFSIGNALED(wait_status)) 793 packet_disconnect("Command terminated on signal %d.", 794 WTERMSIG(wait_status)); 795 796 /* Some weird exit cause. Just exit. */ 797 packet_disconnect("wait returned status %04x.", wait_status); 798 /* NOTREACHED */ 799} 800 801static void 802collect_children(void) 803{ 804 pid_t pid; 805 sigset_t oset, nset; 806 int status; 807 808 /* block SIGCHLD while we check for dead children */ 809 sigemptyset(&nset); 810 sigaddset(&nset, SIGCHLD); 811 sigprocmask(SIG_BLOCK, &nset, &oset); 812 if (child_terminated) { 813 debug("Received SIGCHLD."); 814 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || 815 (pid < 0 && errno == EINTR)) 816 if (pid > 0) 817 session_close_by_pid(pid, status); 818 child_terminated = 0; 819 } 820 sigprocmask(SIG_SETMASK, &oset, NULL); 821} 822 823void 824server_loop2(Authctxt *authctxt) 825{ 826 fd_set *readset = NULL, *writeset = NULL; 827 int rekeying = 0, max_fd; 828 u_int nalloc = 0; 829 u_int64_t rekey_timeout_ms = 0; 830 831 debug("Entering interactive session for SSH2."); 832 833 mysignal(SIGCHLD, sigchld_handler); 834 child_terminated = 0; 835 connection_in = packet_get_connection_in(); 836 connection_out = packet_get_connection_out(); 837 838 if (!use_privsep) { 839 signal(SIGTERM, sigterm_handler); 840 signal(SIGINT, sigterm_handler); 841 signal(SIGQUIT, sigterm_handler); 842 } 843 844 notify_setup(); 845 846 max_fd = MAX(connection_in, connection_out); 847 max_fd = MAX(max_fd, notify_pipe[0]); 848 849 server_init_dispatch(); 850 851 for (;;) { 852 process_buffered_input_packets(); 853 854 rekeying = (active_state->kex != NULL && !active_state->kex->done); 855 856 if (!rekeying && packet_not_very_much_data_to_write()) 857 channel_output_poll(); 858 if (options.rekey_interval > 0 && compat20 && !rekeying) 859 rekey_timeout_ms = packet_get_rekey_timeout() * 1000; 860 else 861 rekey_timeout_ms = 0; 862 863 wait_until_can_do_something(&readset, &writeset, &max_fd, 864 &nalloc, rekey_timeout_ms); 865 866 if (received_sigterm) { 867 logit("Exiting on signal %d", (int)received_sigterm); 868 /* Clean up sessions, utmp, etc. */ 869 cleanup_exit(255); 870 } 871 872 collect_children(); 873 if (!rekeying) { 874 channel_after_select(readset, writeset); 875 if (packet_need_rekeying()) { 876 debug("need rekeying"); 877 active_state->kex->done = 0; 878 kex_send_kexinit(active_state); 879 } 880 } 881 process_input(readset); 882 if (connection_closed) 883 break; 884 process_output(writeset); 885 } 886 collect_children(); 887 888 free(readset); 889 free(writeset); 890 891 /* free all channels, no more reads and writes */ 892 channel_free_all(); 893 894 /* free remaining sessions, e.g. remove wtmp entries */ 895 session_destroy_all(NULL); 896} 897 898static int 899server_input_keep_alive(int type, u_int32_t seq, void *ctxt) 900{ 901 debug("Got %d/%u for keepalive", type, seq); 902 /* 903 * reset timeout, since we got a sane answer from the client. 904 * even if this was generated by something other than 905 * the bogus CHANNEL_REQUEST we send for keepalives. 906 */ 907 packet_set_alive_timeouts(0); 908 return 0; 909} 910 911static int 912server_input_stdin_data(int type, u_int32_t seq, void *ctxt) 913{ 914 char *data; 915 u_int data_len; 916 917 /* Stdin data from the client. Append it to the buffer. */ 918 /* Ignore any data if the client has closed stdin. */ 919 if (fdin == -1) 920 return 0; 921 data = packet_get_string(&data_len); 922 packet_check_eom(); 923 buffer_append(&stdin_buffer, data, data_len); 924 explicit_bzero(data, data_len); 925 free(data); 926 return 0; 927} 928 929static int 930server_input_eof(int type, u_int32_t seq, void *ctxt) 931{ 932 /* 933 * Eof from the client. The stdin descriptor to the 934 * program will be closed when all buffered data has 935 * drained. 936 */ 937 debug("EOF received for stdin."); 938 packet_check_eom(); 939 stdin_eof = 1; 940 return 0; 941} 942 943static int 944server_input_window_size(int type, u_int32_t seq, void *ctxt) 945{ 946 u_int row = packet_get_int(); 947 u_int col = packet_get_int(); 948 u_int xpixel = packet_get_int(); 949 u_int ypixel = packet_get_int(); 950 951 debug("Window change received."); 952 packet_check_eom(); 953 if (fdin != -1) 954 pty_change_window_size(fdin, row, col, xpixel, ypixel); 955 return 0; 956} 957 958static Channel * 959server_request_direct_tcpip(void) 960{ 961 Channel *c = NULL; 962 char *target, *originator; 963 u_short target_port, originator_port; 964 965 target = packet_get_string(NULL); 966 target_port = packet_get_int(); 967 originator = packet_get_string(NULL); 968 originator_port = packet_get_int(); 969 packet_check_eom(); 970 971 debug("server_request_direct_tcpip: originator %s port %d, target %s " 972 "port %d", originator, originator_port, target, target_port); 973 974 /* XXX fine grained permissions */ 975 if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0 && 976 !no_port_forwarding_flag) { 977 c = channel_connect_to_port(target, target_port, 978 "direct-tcpip", "direct-tcpip"); 979 } else { 980 logit("refused local port forward: " 981 "originator %s port %d, target %s port %d", 982 originator, originator_port, target, target_port); 983 } 984 985 free(originator); 986 free(target); 987 988 return c; 989} 990 991static Channel * 992server_request_direct_streamlocal(void) 993{ 994 Channel *c = NULL; 995 char *target, *originator; 996 u_short originator_port; 997 998 target = packet_get_string(NULL); 999 originator = packet_get_string(NULL); 1000 originator_port = packet_get_int(); 1001 packet_check_eom(); 1002 1003 debug("server_request_direct_streamlocal: originator %s port %d, target %s", 1004 originator, originator_port, target); 1005 1006 /* XXX fine grained permissions */ 1007 if ((options.allow_streamlocal_forwarding & FORWARD_LOCAL) != 0 && 1008 !no_port_forwarding_flag) { 1009 c = channel_connect_to_path(target, 1010 "direct-streamlocal@openssh.com", "direct-streamlocal"); 1011 } else { 1012 logit("refused streamlocal port forward: " 1013 "originator %s port %d, target %s", 1014 originator, originator_port, target); 1015 } 1016 1017 free(originator); 1018 free(target); 1019 1020 return c; 1021} 1022 1023static Channel * 1024server_request_tun(void) 1025{ 1026 Channel *c = NULL; 1027 int mode, tun; 1028 int sock; 1029 1030 mode = packet_get_int(); 1031 switch (mode) { 1032 case SSH_TUNMODE_POINTOPOINT: 1033 case SSH_TUNMODE_ETHERNET: 1034 break; 1035 default: 1036 packet_send_debug("Unsupported tunnel device mode."); 1037 return NULL; 1038 } 1039 if ((options.permit_tun & mode) == 0) { 1040 packet_send_debug("Server has rejected tunnel device " 1041 "forwarding"); 1042 return NULL; 1043 } 1044 1045 tun = packet_get_int(); 1046 if (forced_tun_device != -1) { 1047 if (tun != SSH_TUNID_ANY && forced_tun_device != tun) 1048 goto done; 1049 tun = forced_tun_device; 1050 } 1051 sock = tun_open(tun, mode); 1052 if (sock < 0) 1053 goto done; 1054 c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1, 1055 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); 1056 c->datagram = 1; 1057#if defined(SSH_TUN_FILTER) 1058 if (mode == SSH_TUNMODE_POINTOPOINT) 1059 channel_register_filter(c->self, sys_tun_infilter, 1060 sys_tun_outfilter, NULL, NULL); 1061#endif 1062 1063 done: 1064 if (c == NULL) 1065 packet_send_debug("Failed to open the tunnel device."); 1066 return c; 1067} 1068 1069static Channel * 1070server_request_session(void) 1071{ 1072 Channel *c; 1073 1074 debug("input_session_request"); 1075 packet_check_eom(); 1076 1077 if (no_more_sessions) { 1078 packet_disconnect("Possible attack: attempt to open a session " 1079 "after additional sessions disabled"); 1080 } 1081 1082 /* 1083 * A server session has no fd to read or write until a 1084 * CHANNEL_REQUEST for a shell is made, so we set the type to 1085 * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all 1086 * CHANNEL_REQUEST messages is registered. 1087 */ 1088 c = channel_new("session", SSH_CHANNEL_LARVAL, 1089 -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT, 1090 0, "server-session", 1); 1091 if (session_open(the_authctxt, c->self) != 1) { 1092 debug("session open failed, free channel %d", c->self); 1093 channel_free(c); 1094 return NULL; 1095 } 1096 channel_register_cleanup(c->self, session_close_by_channel, 0); 1097 return c; 1098} 1099 1100static int 1101server_input_channel_open(int type, u_int32_t seq, void *ctxt) 1102{ 1103 Channel *c = NULL; 1104 char *ctype; 1105 int rchan; 1106 u_int rmaxpack, rwindow, len; 1107 1108 ctype = packet_get_string(&len); 1109 rchan = packet_get_int(); 1110 rwindow = packet_get_int(); 1111 rmaxpack = packet_get_int(); 1112 1113 debug("server_input_channel_open: ctype %s rchan %d win %d max %d", 1114 ctype, rchan, rwindow, rmaxpack); 1115 1116 if (strcmp(ctype, "session") == 0) { 1117 c = server_request_session(); 1118 } else if (strcmp(ctype, "direct-tcpip") == 0) { 1119 c = server_request_direct_tcpip(); 1120 } else if (strcmp(ctype, "direct-streamlocal@openssh.com") == 0) { 1121 c = server_request_direct_streamlocal(); 1122 } else if (strcmp(ctype, "tun@openssh.com") == 0) { 1123 c = server_request_tun(); 1124 } 1125 if (c != NULL) { 1126 debug("server_input_channel_open: confirm %s", ctype); 1127 c->remote_id = rchan; 1128 c->remote_window = rwindow; 1129 c->remote_maxpacket = rmaxpack; 1130 if (c->type != SSH_CHANNEL_CONNECTING) { 1131 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); 1132 packet_put_int(c->remote_id); 1133 packet_put_int(c->self); 1134 packet_put_int(c->local_window); 1135 packet_put_int(c->local_maxpacket); 1136 packet_send(); 1137 } 1138 } else { 1139 debug("server_input_channel_open: failure %s", ctype); 1140 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); 1141 packet_put_int(rchan); 1142 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); 1143 if (!(datafellows & SSH_BUG_OPENFAILURE)) { 1144 packet_put_cstring("open failed"); 1145 packet_put_cstring(""); 1146 } 1147 packet_send(); 1148 } 1149 free(ctype); 1150 return 0; 1151} 1152 1153static int 1154server_input_hostkeys_prove(struct sshbuf **respp) 1155{ 1156 struct ssh *ssh = active_state; /* XXX */ 1157 struct sshbuf *resp = NULL; 1158 struct sshbuf *sigbuf = NULL; 1159 struct sshkey *key = NULL, *key_pub = NULL, *key_prv = NULL; 1160 int r, ndx, success = 0; 1161 const u_char *blob; 1162 u_char *sig = 0; 1163 size_t blen, slen; 1164 1165 if ((resp = sshbuf_new()) == NULL || (sigbuf = sshbuf_new()) == NULL) 1166 fatal("%s: sshbuf_new", __func__); 1167 1168 while (ssh_packet_remaining(ssh) > 0) { 1169 sshkey_free(key); 1170 key = NULL; 1171 if ((r = sshpkt_get_string_direct(ssh, &blob, &blen)) != 0 || 1172 (r = sshkey_from_blob(blob, blen, &key)) != 0) { 1173 error("%s: couldn't parse key: %s", 1174 __func__, ssh_err(r)); 1175 goto out; 1176 } 1177 /* 1178 * Better check that this is actually one of our hostkeys 1179 * before attempting to sign anything with it. 1180 */ 1181 if ((ndx = ssh->kex->host_key_index(key, 1, ssh)) == -1) { 1182 error("%s: unknown host %s key", 1183 __func__, sshkey_type(key)); 1184 goto out; 1185 } 1186 /* 1187 * XXX refactor: make kex->sign just use an index rather 1188 * than passing in public and private keys 1189 */ 1190 if ((key_prv = get_hostkey_by_index(ndx)) == NULL && 1191 (key_pub = get_hostkey_public_by_index(ndx, ssh)) == NULL) { 1192 error("%s: can't retrieve hostkey %d", __func__, ndx); 1193 goto out; 1194 } 1195 sshbuf_reset(sigbuf); 1196 free(sig); 1197 sig = NULL; 1198 if ((r = sshbuf_put_cstring(sigbuf, 1199 "hostkeys-prove-00@openssh.com")) != 0 || 1200 (r = sshbuf_put_string(sigbuf, 1201 ssh->kex->session_id, ssh->kex->session_id_len)) != 0 || 1202 (r = sshkey_puts(key, sigbuf)) != 0 || 1203 (r = ssh->kex->sign(key_prv, key_pub, &sig, &slen, 1204 sshbuf_ptr(sigbuf), sshbuf_len(sigbuf), 0)) != 0 || 1205 (r = sshbuf_put_string(resp, sig, slen)) != 0) { 1206 error("%s: couldn't prepare signature: %s", 1207 __func__, ssh_err(r)); 1208 goto out; 1209 } 1210 } 1211 /* Success */ 1212 *respp = resp; 1213 resp = NULL; /* don't free it */ 1214 success = 1; 1215 out: 1216 free(sig); 1217 sshbuf_free(resp); 1218 sshbuf_free(sigbuf); 1219 sshkey_free(key); 1220 return success; 1221} 1222 1223static int 1224server_input_global_request(int type, u_int32_t seq, void *ctxt) 1225{ 1226 char *rtype; 1227 int want_reply; 1228 int r, success = 0, allocated_listen_port = 0; 1229 struct sshbuf *resp = NULL; 1230 1231 rtype = packet_get_string(NULL); 1232 want_reply = packet_get_char(); 1233 debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply); 1234 1235 /* -R style forwarding */ 1236 if (strcmp(rtype, "tcpip-forward") == 0) { 1237 struct passwd *pw; 1238 struct Forward fwd; 1239 1240 pw = the_authctxt->pw; 1241 if (pw == NULL || !the_authctxt->valid) 1242 fatal("server_input_global_request: no/invalid user"); 1243 memset(&fwd, 0, sizeof(fwd)); 1244 fwd.listen_host = packet_get_string(NULL); 1245 fwd.listen_port = (u_short)packet_get_int(); 1246 debug("server_input_global_request: tcpip-forward listen %s port %d", 1247 fwd.listen_host, fwd.listen_port); 1248 1249 /* check permissions */ 1250 if ((options.allow_tcp_forwarding & FORWARD_REMOTE) == 0 || 1251 no_port_forwarding_flag || 1252 (!want_reply && fwd.listen_port == 0) 1253#ifndef NO_IPPORT_RESERVED_CONCEPT 1254 || (fwd.listen_port != 0 && fwd.listen_port < IPPORT_RESERVED && 1255 pw->pw_uid != 0) 1256#endif 1257 ) { 1258 success = 0; 1259 packet_send_debug("Server has disabled port forwarding."); 1260 } else { 1261 /* Start listening on the port */ 1262 success = channel_setup_remote_fwd_listener(&fwd, 1263 &allocated_listen_port, &options.fwd_opts); 1264 } 1265 free(fwd.listen_host); 1266 if ((resp = sshbuf_new()) == NULL) 1267 fatal("%s: sshbuf_new", __func__); 1268 if ((r = sshbuf_put_u32(resp, allocated_listen_port)) != 0) 1269 fatal("%s: sshbuf_put_u32: %s", __func__, ssh_err(r)); 1270 } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) { 1271 struct Forward fwd; 1272 1273 memset(&fwd, 0, sizeof(fwd)); 1274 fwd.listen_host = packet_get_string(NULL); 1275 fwd.listen_port = (u_short)packet_get_int(); 1276 debug("%s: cancel-tcpip-forward addr %s port %d", __func__, 1277 fwd.listen_host, fwd.listen_port); 1278 1279 success = channel_cancel_rport_listener(&fwd); 1280 free(fwd.listen_host); 1281 } else if (strcmp(rtype, "streamlocal-forward@openssh.com") == 0) { 1282 struct Forward fwd; 1283 1284 memset(&fwd, 0, sizeof(fwd)); 1285 fwd.listen_path = packet_get_string(NULL); 1286 debug("server_input_global_request: streamlocal-forward listen path %s", 1287 fwd.listen_path); 1288 1289 /* check permissions */ 1290 if ((options.allow_streamlocal_forwarding & FORWARD_REMOTE) == 0 1291 || no_port_forwarding_flag) { 1292 success = 0; 1293 packet_send_debug("Server has disabled port forwarding."); 1294 } else { 1295 /* Start listening on the socket */ 1296 success = channel_setup_remote_fwd_listener( 1297 &fwd, NULL, &options.fwd_opts); 1298 } 1299 free(fwd.listen_path); 1300 } else if (strcmp(rtype, "cancel-streamlocal-forward@openssh.com") == 0) { 1301 struct Forward fwd; 1302 1303 memset(&fwd, 0, sizeof(fwd)); 1304 fwd.listen_path = packet_get_string(NULL); 1305 debug("%s: cancel-streamlocal-forward path %s", __func__, 1306 fwd.listen_path); 1307 1308 success = channel_cancel_rport_listener(&fwd); 1309 free(fwd.listen_path); 1310 } else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) { 1311 no_more_sessions = 1; 1312 success = 1; 1313 } else if (strcmp(rtype, "hostkeys-prove-00@openssh.com") == 0) { 1314 success = server_input_hostkeys_prove(&resp); 1315 } 1316 if (want_reply) { 1317 packet_start(success ? 1318 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); 1319 if (success && resp != NULL) 1320 ssh_packet_put_raw(active_state, sshbuf_ptr(resp), 1321 sshbuf_len(resp)); 1322 packet_send(); 1323 packet_write_wait(); 1324 } 1325 free(rtype); 1326 sshbuf_free(resp); 1327 return 0; 1328} 1329 1330static int 1331server_input_channel_req(int type, u_int32_t seq, void *ctxt) 1332{ 1333 Channel *c; 1334 int id, reply, success = 0; 1335 char *rtype; 1336 1337 id = packet_get_int(); 1338 rtype = packet_get_string(NULL); 1339 reply = packet_get_char(); 1340 1341 debug("server_input_channel_req: channel %d request %s reply %d", 1342 id, rtype, reply); 1343 1344 if ((c = channel_lookup(id)) == NULL) 1345 packet_disconnect("server_input_channel_req: " 1346 "unknown channel %d", id); 1347 if (!strcmp(rtype, "eow@openssh.com")) { 1348 packet_check_eom(); 1349 chan_rcvd_eow(c); 1350 } else if ((c->type == SSH_CHANNEL_LARVAL || 1351 c->type == SSH_CHANNEL_OPEN) && strcmp(c->ctype, "session") == 0) 1352 success = session_input_channel_req(c, rtype); 1353 if (reply && !(c->flags & CHAN_CLOSE_SENT)) { 1354 packet_start(success ? 1355 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); 1356 packet_put_int(c->remote_id); 1357 packet_send(); 1358 } 1359 free(rtype); 1360 return 0; 1361} 1362 1363static void 1364server_init_dispatch_20(void) 1365{ 1366 debug("server_init_dispatch_20"); 1367 dispatch_init(&dispatch_protocol_error); 1368 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); 1369 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); 1370 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); 1371 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); 1372 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open); 1373 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 1374 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 1375 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req); 1376 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); 1377 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request); 1378 /* client_alive */ 1379 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &server_input_keep_alive); 1380 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive); 1381 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive); 1382 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive); 1383 /* rekeying */ 1384 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); 1385} 1386static void 1387server_init_dispatch_13(void) 1388{ 1389 debug("server_init_dispatch_13"); 1390 dispatch_init(NULL); 1391 dispatch_set(SSH_CMSG_EOF, &server_input_eof); 1392 dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data); 1393 dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size); 1394 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); 1395 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); 1396 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); 1397 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 1398 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 1399 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); 1400} 1401static void 1402server_init_dispatch_15(void) 1403{ 1404 server_init_dispatch_13(); 1405 debug("server_init_dispatch_15"); 1406 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); 1407 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose); 1408} 1409static void 1410server_init_dispatch(void) 1411{ 1412 if (compat20) 1413 server_init_dispatch_20(); 1414 else if (compat13) 1415 server_init_dispatch_13(); 1416 else 1417 server_init_dispatch_15(); 1418} 1419