1 /* $OpenBSD: serverloop.c,v 1.184 2016/03/07 19:02:43 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 <sys/param.h> /* MIN MAX */ 39 #include <sys/types.h> 40 #include <sys/wait.h> 41 #include <sys/socket.h> 42 #include <sys/time.h> 43 #include <sys/queue.h> 44 45 #include <netinet/in.h> 46 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <pwd.h> 50 #include <signal.h> 51 #include <string.h> 52 #include <termios.h> 53 #include <unistd.h> 54 #include <stdarg.h> 55 56 #include "xmalloc.h" 57 #include "packet.h" 58 #include "buffer.h" 59 #include "log.h" 60 #include "misc.h" 61 #include "servconf.h" 62 #include "canohost.h" 63 #include "sshpty.h" 64 #include "channels.h" 65 #include "compat.h" 66 #include "ssh1.h" 67 #include "ssh2.h" 68 #include "key.h" 69 #include "cipher.h" 70 #include "kex.h" 71 #include "hostfile.h" 72 #include "auth.h" 73 #include "session.h" 74 #include "dispatch.h" 75 #include "auth-options.h" 76 #include "serverloop.h" 77 #include "ssherr.h" 78 79 extern ServerOptions options; 80 81 /* XXX */ 82 extern Authctxt *the_authctxt; 83 extern int use_privsep; 84 85 static Buffer stdin_buffer; /* Buffer for stdin data. */ 86 static Buffer stdout_buffer; /* Buffer for stdout data. */ 87 static Buffer stderr_buffer; /* Buffer for stderr data. */ 88 static int fdin; /* Descriptor for stdin (for writing) */ 89 static int fdout; /* Descriptor for stdout (for reading); 90 May be same number as fdin. */ 91 static int fderr; /* Descriptor for stderr. May be -1. */ 92 static long stdin_bytes = 0; /* Number of bytes written to stdin. */ 93 static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */ 94 static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */ 95 static long fdout_bytes = 0; /* Number of stdout bytes read from program. */ 96 static int stdin_eof = 0; /* EOF message received from client. */ 97 static int fdout_eof = 0; /* EOF encountered reading from fdout. */ 98 static int fderr_eof = 0; /* EOF encountered readung from fderr. */ 99 static int fdin_is_tty = 0; /* fdin points to a tty. */ 100 static int connection_in; /* Connection to client (input). */ 101 static int connection_out; /* Connection to client (output). */ 102 static int connection_closed = 0; /* Connection to client closed. */ 103 static u_int buffer_high; /* "Soft" max buffer size. */ 104 static int no_more_sessions = 0; /* Disallow further sessions. */ 105 106 /* 107 * This SIGCHLD kludge is used to detect when the child exits. The server 108 * will exit after that, as soon as forwarded connections have terminated. 109 */ 110 111 static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */ 112 113 /* Cleanup on signals (!use_privsep case only) */ 114 static volatile sig_atomic_t received_sigterm = 0; 115 116 /* prototypes */ 117 static void server_init_dispatch(void); 118 119 /* 120 * we write to this pipe if a SIGCHLD is caught in order to avoid 121 * the race between select() and child_terminated 122 */ 123 static int notify_pipe[2]; 124 static void 125 notify_setup(void) 126 { 127 if (pipe(notify_pipe) < 0) { 128 error("pipe(notify_pipe) failed %s", strerror(errno)); 129 } else if ((fcntl(notify_pipe[0], F_SETFD, FD_CLOEXEC) == -1) || 130 (fcntl(notify_pipe[1], F_SETFD, FD_CLOEXEC) == -1)) { 131 error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno)); 132 close(notify_pipe[0]); 133 close(notify_pipe[1]); 134 } else { 135 set_nonblock(notify_pipe[0]); 136 set_nonblock(notify_pipe[1]); 137 return; 138 } 139 notify_pipe[0] = -1; /* read end */ 140 notify_pipe[1] = -1; /* write end */ 141 } 142 static void 143 notify_parent(void) 144 { 145 if (notify_pipe[1] != -1) 146 (void)write(notify_pipe[1], "", 1); 147 } 148 static void 149 notify_prepare(fd_set *readset) 150 { 151 if (notify_pipe[0] != -1) 152 FD_SET(notify_pipe[0], readset); 153 } 154 static void 155 notify_done(fd_set *readset) 156 { 157 char c; 158 159 if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset)) 160 while (read(notify_pipe[0], &c, 1) != -1) 161 debug2("notify_done: reading"); 162 } 163 164 /*ARGSUSED*/ 165 static void 166 sigchld_handler(int sig) 167 { 168 int save_errno = errno; 169 child_terminated = 1; 170 signal(SIGCHLD, sigchld_handler); 171 notify_parent(); 172 errno = save_errno; 173 } 174 175 /*ARGSUSED*/ 176 static void 177 sigterm_handler(int sig) 178 { 179 received_sigterm = sig; 180 } 181 182 /* 183 * Make packets from buffered stderr data, and buffer it for sending 184 * to the client. 185 */ 186 static void 187 make_packets_from_stderr_data(void) 188 { 189 u_int len; 190 191 /* Send buffered stderr data to the client. */ 192 while (buffer_len(&stderr_buffer) > 0 && 193 packet_not_very_much_data_to_write()) { 194 len = buffer_len(&stderr_buffer); 195 if (packet_is_interactive()) { 196 if (len > 512) 197 len = 512; 198 } else { 199 /* Keep the packets at reasonable size. */ 200 if (len > packet_get_maxsize()) 201 len = packet_get_maxsize(); 202 } 203 packet_start(SSH_SMSG_STDERR_DATA); 204 packet_put_string(buffer_ptr(&stderr_buffer), len); 205 packet_send(); 206 buffer_consume(&stderr_buffer, len); 207 stderr_bytes += len; 208 } 209 } 210 211 /* 212 * Make packets from buffered stdout data, and buffer it for sending to the 213 * client. 214 */ 215 static void 216 make_packets_from_stdout_data(void) 217 { 218 u_int len; 219 220 /* Send buffered stdout data to the client. */ 221 while (buffer_len(&stdout_buffer) > 0 && 222 packet_not_very_much_data_to_write()) { 223 len = buffer_len(&stdout_buffer); 224 if (packet_is_interactive()) { 225 if (len > 512) 226 len = 512; 227 } else { 228 /* Keep the packets at reasonable size. */ 229 if (len > packet_get_maxsize()) 230 len = packet_get_maxsize(); 231 } 232 packet_start(SSH_SMSG_STDOUT_DATA); 233 packet_put_string(buffer_ptr(&stdout_buffer), len); 234 packet_send(); 235 buffer_consume(&stdout_buffer, len); 236 stdout_bytes += len; 237 } 238 } 239 240 static void 241 client_alive_check(void) 242 { 243 int channel_id; 244 245 /* timeout, check to see how many we have had */ 246 if (packet_inc_alive_timeouts() > options.client_alive_count_max) { 247 logit("Timeout, client not responding."); 248 cleanup_exit(255); 249 } 250 251 /* 252 * send a bogus global/channel request with "wantreply", 253 * we should get back a failure 254 */ 255 if ((channel_id = channel_find_open()) == -1) { 256 packet_start(SSH2_MSG_GLOBAL_REQUEST); 257 packet_put_cstring("keepalive@openssh.com"); 258 packet_put_char(1); /* boolean: want reply */ 259 } else { 260 channel_request_start(channel_id, "keepalive@openssh.com", 1); 261 } 262 packet_send(); 263 } 264 265 /* 266 * Sleep in select() until we can do something. This will initialize the 267 * select masks. Upon return, the masks will indicate which descriptors 268 * have data or can accept data. Optionally, a maximum time can be specified 269 * for the duration of the wait (0 = infinite). 270 */ 271 static void 272 wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp, 273 u_int *nallocp, u_int64_t max_time_ms) 274 { 275 struct timeval tv, *tvp; 276 int ret; 277 time_t minwait_secs = 0; 278 int client_alive_scheduled = 0; 279 280 /* Allocate and update select() masks for channel descriptors. */ 281 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, 282 &minwait_secs, 0); 283 284 /* XXX need proper deadline system for rekey/client alive */ 285 if (minwait_secs != 0) 286 max_time_ms = MIN(max_time_ms, (u_int)minwait_secs * 1000); 287 288 /* 289 * if using client_alive, set the max timeout accordingly, 290 * and indicate that this particular timeout was for client 291 * alive by setting the client_alive_scheduled flag. 292 * 293 * this could be randomized somewhat to make traffic 294 * analysis more difficult, but we're not doing it yet. 295 */ 296 if (compat20 && options.client_alive_interval) { 297 uint64_t keepalive_ms = 298 (uint64_t)options.client_alive_interval * 1000; 299 300 client_alive_scheduled = 1; 301 if (max_time_ms == 0 || max_time_ms > keepalive_ms) 302 max_time_ms = keepalive_ms; 303 } 304 305 if (compat20) { 306 #if 0 307 /* wrong: bad condition XXX */ 308 if (channel_not_very_much_buffered_data()) 309 #endif 310 FD_SET(connection_in, *readsetp); 311 } else { 312 /* 313 * Read packets from the client unless we have too much 314 * buffered stdin or channel data. 315 */ 316 if (buffer_len(&stdin_buffer) < buffer_high && 317 channel_not_very_much_buffered_data()) 318 FD_SET(connection_in, *readsetp); 319 /* 320 * If there is not too much data already buffered going to 321 * the client, try to get some more data from the program. 322 */ 323 if (packet_not_very_much_data_to_write()) { 324 if (!fdout_eof) 325 FD_SET(fdout, *readsetp); 326 if (!fderr_eof) 327 FD_SET(fderr, *readsetp); 328 } 329 /* 330 * If we have buffered data, try to write some of that data 331 * to the program. 332 */ 333 if (fdin != -1 && buffer_len(&stdin_buffer) > 0) 334 FD_SET(fdin, *writesetp); 335 } 336 notify_prepare(*readsetp); 337 338 /* 339 * If we have buffered packet data going to the client, mark that 340 * descriptor. 341 */ 342 if (packet_have_data_to_write()) 343 FD_SET(connection_out, *writesetp); 344 345 /* 346 * If child has terminated and there is enough buffer space to read 347 * from it, then read as much as is available and exit. 348 */ 349 if (child_terminated && packet_not_very_much_data_to_write()) 350 if (max_time_ms == 0 || client_alive_scheduled) 351 max_time_ms = 100; 352 353 if (max_time_ms == 0) 354 tvp = NULL; 355 else { 356 tv.tv_sec = max_time_ms / 1000; 357 tv.tv_usec = 1000 * (max_time_ms % 1000); 358 tvp = &tv; 359 } 360 361 /* Wait for something to happen, or the timeout to expire. */ 362 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); 363 364 if (ret == -1) { 365 memset(*readsetp, 0, *nallocp); 366 memset(*writesetp, 0, *nallocp); 367 if (errno != EINTR) 368 error("select: %.100s", strerror(errno)); 369 } else if (ret == 0 && client_alive_scheduled) 370 client_alive_check(); 371 372 notify_done(*readsetp); 373 } 374 375 /* 376 * Processes input from the client and the program. Input data is stored 377 * in buffers and processed later. 378 */ 379 static void 380 process_input(fd_set *readset) 381 { 382 struct ssh *ssh = active_state; /* XXX */ 383 int len; 384 char buf[16384]; 385 386 /* Read and buffer any input data from the client. */ 387 if (FD_ISSET(connection_in, readset)) { 388 len = read(connection_in, buf, sizeof(buf)); 389 if (len == 0) { 390 verbose("Connection closed by %.100s port %d", 391 ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)); 392 connection_closed = 1; 393 if (compat20) 394 return; 395 cleanup_exit(255); 396 } else if (len < 0) { 397 if (errno != EINTR && errno != EAGAIN) { 398 verbose("Read error from remote host " 399 "%.100s port %d: %.100s", 400 ssh_remote_ipaddr(ssh), 401 ssh_remote_port(ssh), strerror(errno)); 402 cleanup_exit(255); 403 } 404 } else { 405 /* Buffer any received data. */ 406 packet_process_incoming(buf, len); 407 } 408 } 409 if (compat20) 410 return; 411 412 /* Read and buffer any available stdout data from the program. */ 413 if (!fdout_eof && FD_ISSET(fdout, readset)) { 414 len = read(fdout, buf, sizeof(buf)); 415 if (len < 0 && (errno == EINTR || errno == EAGAIN)) { 416 /* do nothing */ 417 } else if (len <= 0) { 418 fdout_eof = 1; 419 } else { 420 buffer_append(&stdout_buffer, buf, len); 421 fdout_bytes += len; 422 } 423 } 424 /* Read and buffer any available stderr data from the program. */ 425 if (!fderr_eof && FD_ISSET(fderr, readset)) { 426 len = read(fderr, buf, sizeof(buf)); 427 if (len < 0 && (errno == EINTR || errno == EAGAIN)) { 428 /* do nothing */ 429 } else if (len <= 0) { 430 fderr_eof = 1; 431 } else { 432 buffer_append(&stderr_buffer, buf, len); 433 } 434 } 435 } 436 437 /* 438 * Sends data from internal buffers to client program stdin. 439 */ 440 static void 441 process_output(fd_set *writeset) 442 { 443 struct termios tio; 444 u_char *data; 445 u_int dlen; 446 int len; 447 448 /* Write buffered data to program stdin. */ 449 if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) { 450 data = buffer_ptr(&stdin_buffer); 451 dlen = buffer_len(&stdin_buffer); 452 len = write(fdin, data, dlen); 453 if (len < 0 && (errno == EINTR || errno == EAGAIN)) { 454 /* do nothing */ 455 } else if (len <= 0) { 456 if (fdin != fdout) 457 close(fdin); 458 else 459 shutdown(fdin, SHUT_WR); /* We will no longer send. */ 460 fdin = -1; 461 } else { 462 /* Successful write. */ 463 if (fdin_is_tty && dlen >= 1 && data[0] != '\r' && 464 tcgetattr(fdin, &tio) == 0 && 465 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { 466 /* 467 * Simulate echo to reduce the impact of 468 * traffic analysis 469 */ 470 packet_send_ignore(len); 471 packet_send(); 472 } 473 /* Consume the data from the buffer. */ 474 buffer_consume(&stdin_buffer, len); 475 /* Update the count of bytes written to the program. */ 476 stdin_bytes += len; 477 } 478 } 479 /* Send any buffered packet data to the client. */ 480 if (FD_ISSET(connection_out, writeset)) 481 packet_write_poll(); 482 } 483 484 /* 485 * Wait until all buffered output has been sent to the client. 486 * This is used when the program terminates. 487 */ 488 static void 489 drain_output(void) 490 { 491 /* Send any buffered stdout data to the client. */ 492 if (buffer_len(&stdout_buffer) > 0) { 493 packet_start(SSH_SMSG_STDOUT_DATA); 494 packet_put_string(buffer_ptr(&stdout_buffer), 495 buffer_len(&stdout_buffer)); 496 packet_send(); 497 /* Update the count of sent bytes. */ 498 stdout_bytes += buffer_len(&stdout_buffer); 499 } 500 /* Send any buffered stderr data to the client. */ 501 if (buffer_len(&stderr_buffer) > 0) { 502 packet_start(SSH_SMSG_STDERR_DATA); 503 packet_put_string(buffer_ptr(&stderr_buffer), 504 buffer_len(&stderr_buffer)); 505 packet_send(); 506 /* Update the count of sent bytes. */ 507 stderr_bytes += buffer_len(&stderr_buffer); 508 } 509 /* Wait until all buffered data has been written to the client. */ 510 packet_write_wait(); 511 } 512 513 static void 514 process_buffered_input_packets(void) 515 { 516 dispatch_run(DISPATCH_NONBLOCK, NULL, active_state); 517 } 518 519 /* 520 * Performs the interactive session. This handles data transmission between 521 * the client and the program. Note that the notion of stdin, stdout, and 522 * stderr in this function is sort of reversed: this function writes to 523 * stdin (of the child program), and reads from stdout and stderr (of the 524 * child program). 525 */ 526 void 527 server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg) 528 { 529 fd_set *readset = NULL, *writeset = NULL; 530 int max_fd = 0; 531 u_int nalloc = 0; 532 int wait_status; /* Status returned by wait(). */ 533 pid_t wait_pid; /* pid returned by wait(). */ 534 int waiting_termination = 0; /* Have displayed waiting close message. */ 535 u_int64_t max_time_milliseconds; 536 u_int previous_stdout_buffer_bytes; 537 u_int stdout_buffer_bytes; 538 int type; 539 540 debug("Entering interactive session."); 541 542 /* Initialize the SIGCHLD kludge. */ 543 child_terminated = 0; 544 signal(SIGCHLD, sigchld_handler); 545 546 if (!use_privsep) { 547 signal(SIGTERM, sigterm_handler); 548 signal(SIGINT, sigterm_handler); 549 signal(SIGQUIT, sigterm_handler); 550 } 551 552 /* Initialize our global variables. */ 553 fdin = fdin_arg; 554 fdout = fdout_arg; 555 fderr = fderr_arg; 556 557 /* nonblocking IO */ 558 set_nonblock(fdin); 559 set_nonblock(fdout); 560 /* we don't have stderr for interactive terminal sessions, see below */ 561 if (fderr != -1) 562 set_nonblock(fderr); 563 564 if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin)) 565 fdin_is_tty = 1; 566 567 connection_in = packet_get_connection_in(); 568 connection_out = packet_get_connection_out(); 569 570 notify_setup(); 571 572 previous_stdout_buffer_bytes = 0; 573 574 /* Set approximate I/O buffer size. */ 575 if (packet_is_interactive()) 576 buffer_high = 4096; 577 else 578 buffer_high = 64 * 1024; 579 580 #if 0 581 /* Initialize max_fd to the maximum of the known file descriptors. */ 582 max_fd = MAX(connection_in, connection_out); 583 max_fd = MAX(max_fd, fdin); 584 max_fd = MAX(max_fd, fdout); 585 if (fderr != -1) 586 max_fd = MAX(max_fd, fderr); 587 #endif 588 589 /* Initialize Initialize buffers. */ 590 buffer_init(&stdin_buffer); 591 buffer_init(&stdout_buffer); 592 buffer_init(&stderr_buffer); 593 594 /* 595 * If we have no separate fderr (which is the case when we have a pty 596 * - there we cannot make difference between data sent to stdout and 597 * stderr), indicate that we have seen an EOF from stderr. This way 598 * we don't need to check the descriptor everywhere. 599 */ 600 if (fderr == -1) 601 fderr_eof = 1; 602 603 server_init_dispatch(); 604 605 /* Main loop of the server for the interactive session mode. */ 606 for (;;) { 607 608 /* Process buffered packets from the client. */ 609 process_buffered_input_packets(); 610 611 /* 612 * If we have received eof, and there is no more pending 613 * input data, cause a real eof by closing fdin. 614 */ 615 if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) { 616 if (fdin != fdout) 617 close(fdin); 618 else 619 shutdown(fdin, SHUT_WR); /* We will no longer send. */ 620 fdin = -1; 621 } 622 /* Make packets from buffered stderr data to send to the client. */ 623 make_packets_from_stderr_data(); 624 625 /* 626 * Make packets from buffered stdout data to send to the 627 * client. If there is very little to send, this arranges to 628 * not send them now, but to wait a short while to see if we 629 * are getting more data. This is necessary, as some systems 630 * wake up readers from a pty after each separate character. 631 */ 632 max_time_milliseconds = 0; 633 stdout_buffer_bytes = buffer_len(&stdout_buffer); 634 if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 && 635 stdout_buffer_bytes != previous_stdout_buffer_bytes) { 636 /* try again after a while */ 637 max_time_milliseconds = 10; 638 } else { 639 /* Send it now. */ 640 make_packets_from_stdout_data(); 641 } 642 previous_stdout_buffer_bytes = buffer_len(&stdout_buffer); 643 644 /* Send channel data to the client. */ 645 if (packet_not_very_much_data_to_write()) 646 channel_output_poll(); 647 648 /* 649 * Bail out of the loop if the program has closed its output 650 * descriptors, and we have no more data to send to the 651 * client, and there is no pending buffered data. 652 */ 653 if (fdout_eof && fderr_eof && !packet_have_data_to_write() && 654 buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) { 655 if (!channel_still_open()) 656 break; 657 if (!waiting_termination) { 658 const char *s = "Waiting for forwarded connections to terminate...\r\n"; 659 char *cp; 660 waiting_termination = 1; 661 buffer_append(&stderr_buffer, s, strlen(s)); 662 663 /* Display list of open channels. */ 664 cp = channel_open_message(); 665 buffer_append(&stderr_buffer, cp, strlen(cp)); 666 free(cp); 667 } 668 } 669 max_fd = MAX(connection_in, connection_out); 670 max_fd = MAX(max_fd, fdin); 671 max_fd = MAX(max_fd, fdout); 672 max_fd = MAX(max_fd, fderr); 673 max_fd = MAX(max_fd, notify_pipe[0]); 674 675 /* Sleep in select() until we can do something. */ 676 wait_until_can_do_something(&readset, &writeset, &max_fd, 677 &nalloc, max_time_milliseconds); 678 679 if (received_sigterm) { 680 logit("Exiting on signal %d", (int)received_sigterm); 681 /* Clean up sessions, utmp, etc. */ 682 cleanup_exit(255); 683 } 684 685 /* Process any channel events. */ 686 channel_after_select(readset, writeset); 687 688 /* Process input from the client and from program stdout/stderr. */ 689 process_input(readset); 690 691 /* Process output to the client and to program stdin. */ 692 process_output(writeset); 693 } 694 free(readset); 695 free(writeset); 696 697 /* Cleanup and termination code. */ 698 699 /* Wait until all output has been sent to the client. */ 700 drain_output(); 701 702 debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.", 703 stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes); 704 705 /* Free and clear the buffers. */ 706 buffer_free(&stdin_buffer); 707 buffer_free(&stdout_buffer); 708 buffer_free(&stderr_buffer); 709 710 /* Close the file descriptors. */ 711 if (fdout != -1) 712 close(fdout); 713 fdout = -1; 714 fdout_eof = 1; 715 if (fderr != -1) 716 close(fderr); 717 fderr = -1; 718 fderr_eof = 1; 719 if (fdin != -1) 720 close(fdin); 721 fdin = -1; 722 723 channel_free_all(); 724 725 /* We no longer want our SIGCHLD handler to be called. */ 726 signal(SIGCHLD, SIG_DFL); 727 728 while ((wait_pid = waitpid(-1, &wait_status, 0)) < 0) 729 if (errno != EINTR) 730 packet_disconnect("wait: %.100s", strerror(errno)); 731 if (wait_pid != pid) 732 error("Strange, wait returned pid %ld, expected %ld", 733 (long)wait_pid, (long)pid); 734 735 /* Check if it exited normally. */ 736 if (WIFEXITED(wait_status)) { 737 /* Yes, normal exit. Get exit status and send it to the client. */ 738 debug("Command exited with status %d.", WEXITSTATUS(wait_status)); 739 packet_start(SSH_SMSG_EXITSTATUS); 740 packet_put_int(WEXITSTATUS(wait_status)); 741 packet_send(); 742 packet_write_wait(); 743 744 /* 745 * Wait for exit confirmation. Note that there might be 746 * other packets coming before it; however, the program has 747 * already died so we just ignore them. The client is 748 * supposed to respond with the confirmation when it receives 749 * the exit status. 750 */ 751 do { 752 type = packet_read(); 753 } 754 while (type != SSH_CMSG_EXIT_CONFIRMATION); 755 756 debug("Received exit confirmation."); 757 return; 758 } 759 /* Check if the program terminated due to a signal. */ 760 if (WIFSIGNALED(wait_status)) 761 packet_disconnect("Command terminated on signal %d.", 762 WTERMSIG(wait_status)); 763 764 /* Some weird exit cause. Just exit. */ 765 packet_disconnect("wait returned status %04x.", wait_status); 766 /* NOTREACHED */ 767 } 768 769 static void 770 collect_children(void) 771 { 772 pid_t pid; 773 sigset_t oset, nset; 774 int status; 775 776 /* block SIGCHLD while we check for dead children */ 777 sigemptyset(&nset); 778 sigaddset(&nset, SIGCHLD); 779 sigprocmask(SIG_BLOCK, &nset, &oset); 780 if (child_terminated) { 781 debug("Received SIGCHLD."); 782 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || 783 (pid < 0 && errno == EINTR)) 784 if (pid > 0) 785 session_close_by_pid(pid, status); 786 child_terminated = 0; 787 } 788 sigprocmask(SIG_SETMASK, &oset, NULL); 789 } 790 791 void 792 server_loop2(Authctxt *authctxt) 793 { 794 fd_set *readset = NULL, *writeset = NULL; 795 int max_fd; 796 u_int nalloc = 0; 797 u_int64_t rekey_timeout_ms = 0; 798 799 debug("Entering interactive session for SSH2."); 800 801 signal(SIGCHLD, sigchld_handler); 802 child_terminated = 0; 803 connection_in = packet_get_connection_in(); 804 connection_out = packet_get_connection_out(); 805 806 if (!use_privsep) { 807 signal(SIGTERM, sigterm_handler); 808 signal(SIGINT, sigterm_handler); 809 signal(SIGQUIT, sigterm_handler); 810 } 811 812 notify_setup(); 813 814 max_fd = MAX(connection_in, connection_out); 815 max_fd = MAX(max_fd, notify_pipe[0]); 816 817 server_init_dispatch(); 818 819 for (;;) { 820 process_buffered_input_packets(); 821 822 if (!ssh_packet_is_rekeying(active_state) && 823 packet_not_very_much_data_to_write()) 824 channel_output_poll(); 825 if (options.rekey_interval > 0 && compat20 && 826 !ssh_packet_is_rekeying(active_state)) 827 rekey_timeout_ms = packet_get_rekey_timeout() * 1000; 828 else 829 rekey_timeout_ms = 0; 830 831 wait_until_can_do_something(&readset, &writeset, &max_fd, 832 &nalloc, rekey_timeout_ms); 833 834 if (received_sigterm) { 835 logit("Exiting on signal %d", (int)received_sigterm); 836 /* Clean up sessions, utmp, etc. */ 837 cleanup_exit(255); 838 } 839 840 collect_children(); 841 if (!ssh_packet_is_rekeying(active_state)) 842 channel_after_select(readset, writeset); 843 process_input(readset); 844 if (connection_closed) 845 break; 846 process_output(writeset); 847 } 848 collect_children(); 849 850 free(readset); 851 free(writeset); 852 853 /* free all channels, no more reads and writes */ 854 channel_free_all(); 855 856 /* free remaining sessions, e.g. remove wtmp entries */ 857 session_destroy_all(NULL); 858 } 859 860 static int 861 server_input_keep_alive(int type, u_int32_t seq, void *ctxt) 862 { 863 debug("Got %d/%u for keepalive", type, seq); 864 /* 865 * reset timeout, since we got a sane answer from the client. 866 * even if this was generated by something other than 867 * the bogus CHANNEL_REQUEST we send for keepalives. 868 */ 869 packet_set_alive_timeouts(0); 870 return 0; 871 } 872 873 static int 874 server_input_stdin_data(int type, u_int32_t seq, void *ctxt) 875 { 876 char *data; 877 u_int data_len; 878 879 /* Stdin data from the client. Append it to the buffer. */ 880 /* Ignore any data if the client has closed stdin. */ 881 if (fdin == -1) 882 return 0; 883 data = packet_get_string(&data_len); 884 packet_check_eom(); 885 buffer_append(&stdin_buffer, data, data_len); 886 explicit_bzero(data, data_len); 887 free(data); 888 return 0; 889 } 890 891 static int 892 server_input_eof(int type, u_int32_t seq, void *ctxt) 893 { 894 /* 895 * Eof from the client. The stdin descriptor to the 896 * program will be closed when all buffered data has 897 * drained. 898 */ 899 debug("EOF received for stdin."); 900 packet_check_eom(); 901 stdin_eof = 1; 902 return 0; 903 } 904 905 static int 906 server_input_window_size(int type, u_int32_t seq, void *ctxt) 907 { 908 u_int row = packet_get_int(); 909 u_int col = packet_get_int(); 910 u_int xpixel = packet_get_int(); 911 u_int ypixel = packet_get_int(); 912 913 debug("Window change received."); 914 packet_check_eom(); 915 if (fdin != -1) 916 pty_change_window_size(fdin, row, col, xpixel, ypixel); 917 return 0; 918 } 919 920 static Channel * 921 server_request_direct_tcpip(void) 922 { 923 Channel *c = NULL; 924 char *target, *originator; 925 u_short target_port, originator_port; 926 927 target = packet_get_string(NULL); 928 target_port = packet_get_int(); 929 originator = packet_get_string(NULL); 930 originator_port = packet_get_int(); 931 packet_check_eom(); 932 933 debug("server_request_direct_tcpip: originator %s port %d, target %s " 934 "port %d", originator, originator_port, target, target_port); 935 936 /* XXX fine grained permissions */ 937 if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0 && 938 !no_port_forwarding_flag) { 939 c = channel_connect_to_port(target, target_port, 940 "direct-tcpip", "direct-tcpip"); 941 } else { 942 logit("refused local port forward: " 943 "originator %s port %d, target %s port %d", 944 originator, originator_port, target, target_port); 945 } 946 947 free(originator); 948 free(target); 949 950 return c; 951 } 952 953 static Channel * 954 server_request_direct_streamlocal(void) 955 { 956 Channel *c = NULL; 957 char *target, *originator; 958 u_short originator_port; 959 960 target = packet_get_string(NULL); 961 originator = packet_get_string(NULL); 962 originator_port = packet_get_int(); 963 packet_check_eom(); 964 965 debug("server_request_direct_streamlocal: originator %s port %d, target %s", 966 originator, originator_port, target); 967 968 /* XXX fine grained permissions */ 969 if ((options.allow_streamlocal_forwarding & FORWARD_LOCAL) != 0 && 970 !no_port_forwarding_flag) { 971 c = channel_connect_to_path(target, 972 "direct-streamlocal@openssh.com", "direct-streamlocal"); 973 } else { 974 logit("refused streamlocal port forward: " 975 "originator %s port %d, target %s", 976 originator, originator_port, target); 977 } 978 979 free(originator); 980 free(target); 981 982 return c; 983 } 984 985 static Channel * 986 server_request_tun(void) 987 { 988 Channel *c = NULL; 989 int mode, tun; 990 int sock; 991 992 mode = packet_get_int(); 993 switch (mode) { 994 case SSH_TUNMODE_POINTOPOINT: 995 case SSH_TUNMODE_ETHERNET: 996 break; 997 default: 998 packet_send_debug("Unsupported tunnel device mode."); 999 return NULL; 1000 } 1001 if ((options.permit_tun & mode) == 0) { 1002 packet_send_debug("Server has rejected tunnel device " 1003 "forwarding"); 1004 return NULL; 1005 } 1006 1007 tun = packet_get_int(); 1008 if (forced_tun_device != -1) { 1009 if (tun != SSH_TUNID_ANY && forced_tun_device != tun) 1010 goto done; 1011 tun = forced_tun_device; 1012 } 1013 sock = tun_open(tun, mode); 1014 if (sock < 0) 1015 goto done; 1016 c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1, 1017 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); 1018 c->datagram = 1; 1019 1020 done: 1021 if (c == NULL) 1022 packet_send_debug("Failed to open the tunnel device."); 1023 return c; 1024 } 1025 1026 static Channel * 1027 server_request_session(void) 1028 { 1029 Channel *c; 1030 1031 debug("input_session_request"); 1032 packet_check_eom(); 1033 1034 if (no_more_sessions) { 1035 packet_disconnect("Possible attack: attempt to open a session " 1036 "after additional sessions disabled"); 1037 } 1038 1039 /* 1040 * A server session has no fd to read or write until a 1041 * CHANNEL_REQUEST for a shell is made, so we set the type to 1042 * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all 1043 * CHANNEL_REQUEST messages is registered. 1044 */ 1045 c = channel_new("session", SSH_CHANNEL_LARVAL, 1046 -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT, 1047 0, "server-session", 1); 1048 if (session_open(the_authctxt, c->self) != 1) { 1049 debug("session open failed, free channel %d", c->self); 1050 channel_free(c); 1051 return NULL; 1052 } 1053 channel_register_cleanup(c->self, session_close_by_channel, 0); 1054 return c; 1055 } 1056 1057 static int 1058 server_input_channel_open(int type, u_int32_t seq, void *ctxt) 1059 { 1060 Channel *c = NULL; 1061 char *ctype; 1062 int rchan; 1063 u_int rmaxpack, rwindow, len; 1064 1065 ctype = packet_get_string(&len); 1066 rchan = packet_get_int(); 1067 rwindow = packet_get_int(); 1068 rmaxpack = packet_get_int(); 1069 1070 debug("server_input_channel_open: ctype %s rchan %d win %d max %d", 1071 ctype, rchan, rwindow, rmaxpack); 1072 1073 if (strcmp(ctype, "session") == 0) { 1074 c = server_request_session(); 1075 } else if (strcmp(ctype, "direct-tcpip") == 0) { 1076 c = server_request_direct_tcpip(); 1077 } else if (strcmp(ctype, "direct-streamlocal@openssh.com") == 0) { 1078 c = server_request_direct_streamlocal(); 1079 } else if (strcmp(ctype, "tun@openssh.com") == 0) { 1080 c = server_request_tun(); 1081 } 1082 if (c != NULL) { 1083 debug("server_input_channel_open: confirm %s", ctype); 1084 c->remote_id = rchan; 1085 c->remote_window = rwindow; 1086 c->remote_maxpacket = rmaxpack; 1087 if (c->type != SSH_CHANNEL_CONNECTING) { 1088 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); 1089 packet_put_int(c->remote_id); 1090 packet_put_int(c->self); 1091 packet_put_int(c->local_window); 1092 packet_put_int(c->local_maxpacket); 1093 packet_send(); 1094 } 1095 } else { 1096 debug("server_input_channel_open: failure %s", ctype); 1097 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); 1098 packet_put_int(rchan); 1099 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); 1100 if (!(datafellows & SSH_BUG_OPENFAILURE)) { 1101 packet_put_cstring("open failed"); 1102 packet_put_cstring(""); 1103 } 1104 packet_send(); 1105 } 1106 free(ctype); 1107 return 0; 1108 } 1109 1110 static int 1111 server_input_hostkeys_prove(struct sshbuf **respp) 1112 { 1113 struct ssh *ssh = active_state; /* XXX */ 1114 struct sshbuf *resp = NULL; 1115 struct sshbuf *sigbuf = NULL; 1116 struct sshkey *key = NULL, *key_pub = NULL, *key_prv = NULL; 1117 int r, ndx, success = 0; 1118 const u_char *blob; 1119 u_char *sig = 0; 1120 size_t blen, slen; 1121 1122 if ((resp = sshbuf_new()) == NULL || (sigbuf = sshbuf_new()) == NULL) 1123 fatal("%s: sshbuf_new", __func__); 1124 1125 while (ssh_packet_remaining(ssh) > 0) { 1126 sshkey_free(key); 1127 key = NULL; 1128 if ((r = sshpkt_get_string_direct(ssh, &blob, &blen)) != 0 || 1129 (r = sshkey_from_blob(blob, blen, &key)) != 0) { 1130 error("%s: couldn't parse key: %s", 1131 __func__, ssh_err(r)); 1132 goto out; 1133 } 1134 /* 1135 * Better check that this is actually one of our hostkeys 1136 * before attempting to sign anything with it. 1137 */ 1138 if ((ndx = ssh->kex->host_key_index(key, 1, ssh)) == -1) { 1139 error("%s: unknown host %s key", 1140 __func__, sshkey_type(key)); 1141 goto out; 1142 } 1143 /* 1144 * XXX refactor: make kex->sign just use an index rather 1145 * than passing in public and private keys 1146 */ 1147 if ((key_prv = get_hostkey_by_index(ndx)) == NULL && 1148 (key_pub = get_hostkey_public_by_index(ndx, ssh)) == NULL) { 1149 error("%s: can't retrieve hostkey %d", __func__, ndx); 1150 goto out; 1151 } 1152 sshbuf_reset(sigbuf); 1153 free(sig); 1154 sig = NULL; 1155 if ((r = sshbuf_put_cstring(sigbuf, 1156 "hostkeys-prove-00@openssh.com")) != 0 || 1157 (r = sshbuf_put_string(sigbuf, 1158 ssh->kex->session_id, ssh->kex->session_id_len)) != 0 || 1159 (r = sshkey_puts(key, sigbuf)) != 0 || 1160 (r = ssh->kex->sign(key_prv, key_pub, &sig, &slen, 1161 sshbuf_ptr(sigbuf), sshbuf_len(sigbuf), NULL, 0)) != 0 || 1162 (r = sshbuf_put_string(resp, sig, slen)) != 0) { 1163 error("%s: couldn't prepare signature: %s", 1164 __func__, ssh_err(r)); 1165 goto out; 1166 } 1167 } 1168 /* Success */ 1169 *respp = resp; 1170 resp = NULL; /* don't free it */ 1171 success = 1; 1172 out: 1173 free(sig); 1174 sshbuf_free(resp); 1175 sshbuf_free(sigbuf); 1176 sshkey_free(key); 1177 return success; 1178 } 1179 1180 static int 1181 server_input_global_request(int type, u_int32_t seq, void *ctxt) 1182 { 1183 char *rtype; 1184 int want_reply; 1185 int r, success = 0, allocated_listen_port = 0; 1186 struct sshbuf *resp = NULL; 1187 1188 rtype = packet_get_string(NULL); 1189 want_reply = packet_get_char(); 1190 debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply); 1191 1192 /* -R style forwarding */ 1193 if (strcmp(rtype, "tcpip-forward") == 0) { 1194 struct passwd *pw; 1195 struct Forward fwd; 1196 1197 pw = the_authctxt->pw; 1198 if (pw == NULL || !the_authctxt->valid) 1199 fatal("server_input_global_request: no/invalid user"); 1200 memset(&fwd, 0, sizeof(fwd)); 1201 fwd.listen_host = packet_get_string(NULL); 1202 fwd.listen_port = (u_short)packet_get_int(); 1203 debug("server_input_global_request: tcpip-forward listen %s port %d", 1204 fwd.listen_host, fwd.listen_port); 1205 1206 /* check permissions */ 1207 if ((options.allow_tcp_forwarding & FORWARD_REMOTE) == 0 || 1208 no_port_forwarding_flag || 1209 (!want_reply && fwd.listen_port == 0) || 1210 (fwd.listen_port != 0 && fwd.listen_port < IPPORT_RESERVED && 1211 pw->pw_uid != 0)) { 1212 success = 0; 1213 packet_send_debug("Server has disabled port forwarding."); 1214 } else { 1215 /* Start listening on the port */ 1216 success = channel_setup_remote_fwd_listener(&fwd, 1217 &allocated_listen_port, &options.fwd_opts); 1218 } 1219 free(fwd.listen_host); 1220 if ((resp = sshbuf_new()) == NULL) 1221 fatal("%s: sshbuf_new", __func__); 1222 if (allocated_listen_port != 0 && 1223 (r = sshbuf_put_u32(resp, allocated_listen_port)) != 0) 1224 fatal("%s: sshbuf_put_u32: %s", __func__, ssh_err(r)); 1225 } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) { 1226 struct Forward fwd; 1227 1228 memset(&fwd, 0, sizeof(fwd)); 1229 fwd.listen_host = packet_get_string(NULL); 1230 fwd.listen_port = (u_short)packet_get_int(); 1231 debug("%s: cancel-tcpip-forward addr %s port %d", __func__, 1232 fwd.listen_host, fwd.listen_port); 1233 1234 success = channel_cancel_rport_listener(&fwd); 1235 free(fwd.listen_host); 1236 } else if (strcmp(rtype, "streamlocal-forward@openssh.com") == 0) { 1237 struct Forward fwd; 1238 1239 memset(&fwd, 0, sizeof(fwd)); 1240 fwd.listen_path = packet_get_string(NULL); 1241 debug("server_input_global_request: streamlocal-forward listen path %s", 1242 fwd.listen_path); 1243 1244 /* check permissions */ 1245 if ((options.allow_streamlocal_forwarding & FORWARD_REMOTE) == 0 1246 || no_port_forwarding_flag) { 1247 success = 0; 1248 packet_send_debug("Server has disabled port forwarding."); 1249 } else { 1250 /* Start listening on the socket */ 1251 success = channel_setup_remote_fwd_listener( 1252 &fwd, NULL, &options.fwd_opts); 1253 } 1254 free(fwd.listen_path); 1255 } else if (strcmp(rtype, "cancel-streamlocal-forward@openssh.com") == 0) { 1256 struct Forward fwd; 1257 1258 memset(&fwd, 0, sizeof(fwd)); 1259 fwd.listen_path = packet_get_string(NULL); 1260 debug("%s: cancel-streamlocal-forward path %s", __func__, 1261 fwd.listen_path); 1262 1263 success = channel_cancel_rport_listener(&fwd); 1264 free(fwd.listen_path); 1265 } else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) { 1266 no_more_sessions = 1; 1267 success = 1; 1268 } else if (strcmp(rtype, "hostkeys-prove-00@openssh.com") == 0) { 1269 success = server_input_hostkeys_prove(&resp); 1270 } 1271 if (want_reply) { 1272 packet_start(success ? 1273 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); 1274 if (success && resp != NULL) 1275 ssh_packet_put_raw(active_state, sshbuf_ptr(resp), 1276 sshbuf_len(resp)); 1277 packet_send(); 1278 packet_write_wait(); 1279 } 1280 free(rtype); 1281 sshbuf_free(resp); 1282 return 0; 1283 } 1284 1285 static int 1286 server_input_channel_req(int type, u_int32_t seq, void *ctxt) 1287 { 1288 Channel *c; 1289 int id, reply, success = 0; 1290 char *rtype; 1291 1292 id = packet_get_int(); 1293 rtype = packet_get_string(NULL); 1294 reply = packet_get_char(); 1295 1296 debug("server_input_channel_req: channel %d request %s reply %d", 1297 id, rtype, reply); 1298 1299 if ((c = channel_lookup(id)) == NULL) 1300 packet_disconnect("server_input_channel_req: " 1301 "unknown channel %d", id); 1302 if (!strcmp(rtype, "eow@openssh.com")) { 1303 packet_check_eom(); 1304 chan_rcvd_eow(c); 1305 } else if ((c->type == SSH_CHANNEL_LARVAL || 1306 c->type == SSH_CHANNEL_OPEN) && strcmp(c->ctype, "session") == 0) 1307 success = session_input_channel_req(c, rtype); 1308 if (reply && !(c->flags & CHAN_CLOSE_SENT)) { 1309 packet_start(success ? 1310 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); 1311 packet_put_int(c->remote_id); 1312 packet_send(); 1313 } 1314 free(rtype); 1315 return 0; 1316 } 1317 1318 static void 1319 server_init_dispatch_20(void) 1320 { 1321 debug("server_init_dispatch_20"); 1322 dispatch_init(&dispatch_protocol_error); 1323 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); 1324 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); 1325 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); 1326 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); 1327 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open); 1328 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 1329 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 1330 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req); 1331 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); 1332 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request); 1333 /* client_alive */ 1334 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &server_input_keep_alive); 1335 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive); 1336 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive); 1337 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive); 1338 /* rekeying */ 1339 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); 1340 } 1341 static void 1342 server_init_dispatch_13(void) 1343 { 1344 debug("server_init_dispatch_13"); 1345 dispatch_init(NULL); 1346 dispatch_set(SSH_CMSG_EOF, &server_input_eof); 1347 dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data); 1348 dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size); 1349 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); 1350 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); 1351 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); 1352 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 1353 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 1354 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); 1355 } 1356 static void 1357 server_init_dispatch_15(void) 1358 { 1359 server_init_dispatch_13(); 1360 debug("server_init_dispatch_15"); 1361 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); 1362 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose); 1363 } 1364 static void 1365 server_init_dispatch(void) 1366 { 1367 if (compat20) 1368 server_init_dispatch_20(); 1369 else if (compat13) 1370 server_init_dispatch_13(); 1371 else 1372 server_init_dispatch_15(); 1373 } 1374