1 /* $OpenBSD: serverloop.c,v 1.182 2016/02/08 10:57:07 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 "ssherr.h" 82 83 extern ServerOptions options; 84 85 /* XXX */ 86 extern Authctxt *the_authctxt; 87 extern int use_privsep; 88 89 static Buffer stdin_buffer; /* Buffer for stdin data. */ 90 static Buffer stdout_buffer; /* Buffer for stdout data. */ 91 static Buffer stderr_buffer; /* Buffer for stderr data. */ 92 static int fdin; /* Descriptor for stdin (for writing) */ 93 static int fdout; /* Descriptor for stdout (for reading); 94 May be same number as fdin. */ 95 static int fderr; /* Descriptor for stderr. May be -1. */ 96 static long stdin_bytes = 0; /* Number of bytes written to stdin. */ 97 static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */ 98 static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */ 99 static long fdout_bytes = 0; /* Number of stdout bytes read from program. */ 100 static int stdin_eof = 0; /* EOF message received from client. */ 101 static int fdout_eof = 0; /* EOF encountered reading from fdout. */ 102 static int fderr_eof = 0; /* EOF encountered readung from fderr. */ 103 static int fdin_is_tty = 0; /* fdin points to a tty. */ 104 static int connection_in; /* Connection to client (input). */ 105 static int connection_out; /* Connection to client (output). */ 106 static int connection_closed = 0; /* Connection to client closed. */ 107 static u_int buffer_high; /* "Soft" max buffer size. */ 108 static int no_more_sessions = 0; /* Disallow further sessions. */ 109 110 /* 111 * This SIGCHLD kludge is used to detect when the child exits. The server 112 * will exit after that, as soon as forwarded connections have terminated. 113 */ 114 115 static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */ 116 117 /* Cleanup on signals (!use_privsep case only) */ 118 static volatile sig_atomic_t received_sigterm = 0; 119 120 /* prototypes */ 121 static void server_init_dispatch(void); 122 123 /* 124 * we write to this pipe if a SIGCHLD is caught in order to avoid 125 * the race between select() and child_terminated 126 */ 127 static int notify_pipe[2]; 128 static void 129 notify_setup(void) 130 { 131 if (pipe(notify_pipe) < 0) { 132 error("pipe(notify_pipe) failed %s", strerror(errno)); 133 } else if ((fcntl(notify_pipe[0], F_SETFD, FD_CLOEXEC) == -1) || 134 (fcntl(notify_pipe[1], F_SETFD, FD_CLOEXEC) == -1)) { 135 error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno)); 136 close(notify_pipe[0]); 137 close(notify_pipe[1]); 138 } else { 139 set_nonblock(notify_pipe[0]); 140 set_nonblock(notify_pipe[1]); 141 return; 142 } 143 notify_pipe[0] = -1; /* read end */ 144 notify_pipe[1] = -1; /* write end */ 145 } 146 static void 147 notify_parent(void) 148 { 149 if (notify_pipe[1] != -1) 150 (void)write(notify_pipe[1], "", 1); 151 } 152 static void 153 notify_prepare(fd_set *readset) 154 { 155 if (notify_pipe[0] != -1) 156 FD_SET(notify_pipe[0], readset); 157 } 158 static void 159 notify_done(fd_set *readset) 160 { 161 char c; 162 163 if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset)) 164 while (read(notify_pipe[0], &c, 1) != -1) 165 debug2("notify_done: reading"); 166 } 167 168 /*ARGSUSED*/ 169 static void 170 sigchld_handler(int sig) 171 { 172 int save_errno = errno; 173 child_terminated = 1; 174 #ifndef _UNICOS 175 mysignal(SIGCHLD, sigchld_handler); 176 #endif 177 notify_parent(); 178 errno = save_errno; 179 } 180 181 /*ARGSUSED*/ 182 static void 183 sigterm_handler(int sig) 184 { 185 received_sigterm = sig; 186 } 187 188 /* 189 * Make packets from buffered stderr data, and buffer it for sending 190 * to the client. 191 */ 192 static void 193 make_packets_from_stderr_data(void) 194 { 195 u_int len; 196 197 /* Send buffered stderr data to the client. */ 198 while (buffer_len(&stderr_buffer) > 0 && 199 packet_not_very_much_data_to_write()) { 200 len = buffer_len(&stderr_buffer); 201 if (packet_is_interactive()) { 202 if (len > 512) 203 len = 512; 204 } else { 205 /* Keep the packets at reasonable size. */ 206 if (len > packet_get_maxsize()) 207 len = packet_get_maxsize(); 208 } 209 packet_start(SSH_SMSG_STDERR_DATA); 210 packet_put_string(buffer_ptr(&stderr_buffer), len); 211 packet_send(); 212 buffer_consume(&stderr_buffer, len); 213 stderr_bytes += len; 214 } 215 } 216 217 /* 218 * Make packets from buffered stdout data, and buffer it for sending to the 219 * client. 220 */ 221 static void 222 make_packets_from_stdout_data(void) 223 { 224 u_int len; 225 226 /* Send buffered stdout data to the client. */ 227 while (buffer_len(&stdout_buffer) > 0 && 228 packet_not_very_much_data_to_write()) { 229 len = buffer_len(&stdout_buffer); 230 if (packet_is_interactive()) { 231 if (len > 512) 232 len = 512; 233 } else { 234 /* Keep the packets at reasonable size. */ 235 if (len > packet_get_maxsize()) 236 len = packet_get_maxsize(); 237 } 238 packet_start(SSH_SMSG_STDOUT_DATA); 239 packet_put_string(buffer_ptr(&stdout_buffer), len); 240 packet_send(); 241 buffer_consume(&stdout_buffer, len); 242 stdout_bytes += len; 243 } 244 } 245 246 static void 247 client_alive_check(void) 248 { 249 int channel_id; 250 251 /* timeout, check to see how many we have had */ 252 if (packet_inc_alive_timeouts() > options.client_alive_count_max) { 253 logit("Timeout, client not responding."); 254 cleanup_exit(255); 255 } 256 257 /* 258 * send a bogus global/channel request with "wantreply", 259 * we should get back a failure 260 */ 261 if ((channel_id = channel_find_open()) == -1) { 262 packet_start(SSH2_MSG_GLOBAL_REQUEST); 263 packet_put_cstring("keepalive@openssh.com"); 264 packet_put_char(1); /* boolean: want reply */ 265 } else { 266 channel_request_start(channel_id, "keepalive@openssh.com", 1); 267 } 268 packet_send(); 269 } 270 271 /* 272 * Sleep in select() until we can do something. This will initialize the 273 * select masks. Upon return, the masks will indicate which descriptors 274 * have data or can accept data. Optionally, a maximum time can be specified 275 * for the duration of the wait (0 = infinite). 276 */ 277 static void 278 wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp, 279 u_int *nallocp, u_int64_t max_time_milliseconds) 280 { 281 struct timeval tv, *tvp; 282 int ret; 283 time_t minwait_secs = 0; 284 int client_alive_scheduled = 0; 285 int program_alive_scheduled = 0; 286 287 /* Allocate and update select() masks for channel descriptors. */ 288 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, 289 &minwait_secs, 0); 290 291 if (minwait_secs != 0) 292 max_time_milliseconds = MIN(max_time_milliseconds, 293 (u_int)minwait_secs * 1000); 294 295 /* 296 * if using client_alive, set the max timeout accordingly, 297 * and indicate that this particular timeout was for client 298 * alive by setting the client_alive_scheduled flag. 299 * 300 * this could be randomized somewhat to make traffic 301 * analysis more difficult, but we're not doing it yet. 302 */ 303 if (compat20 && 304 max_time_milliseconds == 0 && options.client_alive_interval) { 305 client_alive_scheduled = 1; 306 max_time_milliseconds = 307 (u_int64_t)options.client_alive_interval * 1000; 308 } 309 310 if (compat20) { 311 #if 0 312 /* wrong: bad condition XXX */ 313 if (channel_not_very_much_buffered_data()) 314 #endif 315 FD_SET(connection_in, *readsetp); 316 } else { 317 /* 318 * Read packets from the client unless we have too much 319 * buffered stdin or channel data. 320 */ 321 if (buffer_len(&stdin_buffer) < buffer_high && 322 channel_not_very_much_buffered_data()) 323 FD_SET(connection_in, *readsetp); 324 /* 325 * If there is not too much data already buffered going to 326 * the client, try to get some more data from the program. 327 */ 328 if (packet_not_very_much_data_to_write()) { 329 program_alive_scheduled = child_terminated; 330 if (!fdout_eof) 331 FD_SET(fdout, *readsetp); 332 if (!fderr_eof) 333 FD_SET(fderr, *readsetp); 334 } 335 /* 336 * If we have buffered data, try to write some of that data 337 * to the program. 338 */ 339 if (fdin != -1 && buffer_len(&stdin_buffer) > 0) 340 FD_SET(fdin, *writesetp); 341 } 342 notify_prepare(*readsetp); 343 344 /* 345 * If we have buffered packet data going to the client, mark that 346 * descriptor. 347 */ 348 if (packet_have_data_to_write()) 349 FD_SET(connection_out, *writesetp); 350 351 /* 352 * If child has terminated and there is enough buffer space to read 353 * from it, then read as much as is available and exit. 354 */ 355 if (child_terminated && packet_not_very_much_data_to_write()) 356 if (max_time_milliseconds == 0 || client_alive_scheduled) 357 max_time_milliseconds = 100; 358 359 if (max_time_milliseconds == 0) 360 tvp = NULL; 361 else { 362 tv.tv_sec = max_time_milliseconds / 1000; 363 tv.tv_usec = 1000 * (max_time_milliseconds % 1000); 364 tvp = &tv; 365 } 366 367 /* Wait for something to happen, or the timeout to expire. */ 368 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); 369 370 if (ret == -1) { 371 memset(*readsetp, 0, *nallocp); 372 memset(*writesetp, 0, *nallocp); 373 if (errno != EINTR) 374 error("select: %.100s", strerror(errno)); 375 } else { 376 if (ret == 0 && client_alive_scheduled) 377 client_alive_check(); 378 if (!compat20 && program_alive_scheduled && fdin_is_tty) { 379 if (!fdout_eof) 380 FD_SET(fdout, *readsetp); 381 if (!fderr_eof) 382 FD_SET(fderr, *readsetp); 383 } 384 } 385 386 notify_done(*readsetp); 387 } 388 389 /* 390 * Processes input from the client and the program. Input data is stored 391 * in buffers and processed later. 392 */ 393 static void 394 process_input(fd_set *readset) 395 { 396 int len; 397 char buf[16384]; 398 399 /* Read and buffer any input data from the client. */ 400 if (FD_ISSET(connection_in, readset)) { 401 len = read(connection_in, buf, sizeof(buf)); 402 if (len == 0) { 403 verbose("Connection closed by %.100s", 404 get_remote_ipaddr()); 405 connection_closed = 1; 406 if (compat20) 407 return; 408 cleanup_exit(255); 409 } else if (len < 0) { 410 if (errno != EINTR && errno != EAGAIN && 411 errno != EWOULDBLOCK) { 412 verbose("Read error from remote host " 413 "%.100s: %.100s", 414 get_remote_ipaddr(), strerror(errno)); 415 cleanup_exit(255); 416 } 417 } else { 418 /* Buffer any received data. */ 419 packet_process_incoming(buf, len); 420 } 421 } 422 if (compat20) 423 return; 424 425 /* Read and buffer any available stdout data from the program. */ 426 if (!fdout_eof && FD_ISSET(fdout, readset)) { 427 errno = 0; 428 len = read(fdout, buf, sizeof(buf)); 429 if (len < 0 && (errno == EINTR || ((errno == EAGAIN || 430 errno == EWOULDBLOCK) && !child_terminated))) { 431 /* do nothing */ 432 #ifndef PTY_ZEROREAD 433 } else if (len <= 0) { 434 #else 435 } else if ((!isatty(fdout) && len <= 0) || 436 (isatty(fdout) && (len < 0 || (len == 0 && errno != 0)))) { 437 #endif 438 fdout_eof = 1; 439 } else { 440 buffer_append(&stdout_buffer, buf, len); 441 fdout_bytes += len; 442 } 443 } 444 /* Read and buffer any available stderr data from the program. */ 445 if (!fderr_eof && FD_ISSET(fderr, readset)) { 446 errno = 0; 447 len = read(fderr, buf, sizeof(buf)); 448 if (len < 0 && (errno == EINTR || ((errno == EAGAIN || 449 errno == EWOULDBLOCK) && !child_terminated))) { 450 /* do nothing */ 451 #ifndef PTY_ZEROREAD 452 } else if (len <= 0) { 453 #else 454 } else if ((!isatty(fderr) && len <= 0) || 455 (isatty(fderr) && (len < 0 || (len == 0 && errno != 0)))) { 456 #endif 457 fderr_eof = 1; 458 } else { 459 buffer_append(&stderr_buffer, buf, len); 460 } 461 } 462 } 463 464 /* 465 * Sends data from internal buffers to client program stdin. 466 */ 467 static void 468 process_output(fd_set *writeset) 469 { 470 struct termios tio; 471 u_char *data; 472 u_int dlen; 473 int len; 474 475 /* Write buffered data to program stdin. */ 476 if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) { 477 data = buffer_ptr(&stdin_buffer); 478 dlen = buffer_len(&stdin_buffer); 479 len = write(fdin, data, dlen); 480 if (len < 0 && 481 (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) { 482 /* do nothing */ 483 } else if (len <= 0) { 484 if (fdin != fdout) 485 close(fdin); 486 else 487 shutdown(fdin, SHUT_WR); /* We will no longer send. */ 488 fdin = -1; 489 } else { 490 /* Successful write. */ 491 if (fdin_is_tty && dlen >= 1 && data[0] != '\r' && 492 tcgetattr(fdin, &tio) == 0 && 493 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { 494 /* 495 * Simulate echo to reduce the impact of 496 * traffic analysis 497 */ 498 packet_send_ignore(len); 499 packet_send(); 500 } 501 /* Consume the data from the buffer. */ 502 buffer_consume(&stdin_buffer, len); 503 /* Update the count of bytes written to the program. */ 504 stdin_bytes += len; 505 } 506 } 507 /* Send any buffered packet data to the client. */ 508 if (FD_ISSET(connection_out, writeset)) 509 packet_write_poll(); 510 } 511 512 /* 513 * Wait until all buffered output has been sent to the client. 514 * This is used when the program terminates. 515 */ 516 static void 517 drain_output(void) 518 { 519 /* Send any buffered stdout data to the client. */ 520 if (buffer_len(&stdout_buffer) > 0) { 521 packet_start(SSH_SMSG_STDOUT_DATA); 522 packet_put_string(buffer_ptr(&stdout_buffer), 523 buffer_len(&stdout_buffer)); 524 packet_send(); 525 /* Update the count of sent bytes. */ 526 stdout_bytes += buffer_len(&stdout_buffer); 527 } 528 /* Send any buffered stderr data to the client. */ 529 if (buffer_len(&stderr_buffer) > 0) { 530 packet_start(SSH_SMSG_STDERR_DATA); 531 packet_put_string(buffer_ptr(&stderr_buffer), 532 buffer_len(&stderr_buffer)); 533 packet_send(); 534 /* Update the count of sent bytes. */ 535 stderr_bytes += buffer_len(&stderr_buffer); 536 } 537 /* Wait until all buffered data has been written to the client. */ 538 packet_write_wait(); 539 } 540 541 static void 542 process_buffered_input_packets(void) 543 { 544 dispatch_run(DISPATCH_NONBLOCK, NULL, active_state); 545 } 546 547 /* 548 * Performs the interactive session. This handles data transmission between 549 * the client and the program. Note that the notion of stdin, stdout, and 550 * stderr in this function is sort of reversed: this function writes to 551 * stdin (of the child program), and reads from stdout and stderr (of the 552 * child program). 553 */ 554 void 555 server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg) 556 { 557 fd_set *readset = NULL, *writeset = NULL; 558 int max_fd = 0; 559 u_int nalloc = 0; 560 int wait_status; /* Status returned by wait(). */ 561 pid_t wait_pid; /* pid returned by wait(). */ 562 int waiting_termination = 0; /* Have displayed waiting close message. */ 563 u_int64_t max_time_milliseconds; 564 u_int previous_stdout_buffer_bytes; 565 u_int stdout_buffer_bytes; 566 int type; 567 568 debug("Entering interactive session."); 569 570 /* Initialize the SIGCHLD kludge. */ 571 child_terminated = 0; 572 mysignal(SIGCHLD, sigchld_handler); 573 574 if (!use_privsep) { 575 signal(SIGTERM, sigterm_handler); 576 signal(SIGINT, sigterm_handler); 577 signal(SIGQUIT, sigterm_handler); 578 } 579 580 /* Initialize our global variables. */ 581 fdin = fdin_arg; 582 fdout = fdout_arg; 583 fderr = fderr_arg; 584 585 /* nonblocking IO */ 586 set_nonblock(fdin); 587 set_nonblock(fdout); 588 /* we don't have stderr for interactive terminal sessions, see below */ 589 if (fderr != -1) 590 set_nonblock(fderr); 591 592 if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin)) 593 fdin_is_tty = 1; 594 595 connection_in = packet_get_connection_in(); 596 connection_out = packet_get_connection_out(); 597 598 notify_setup(); 599 600 previous_stdout_buffer_bytes = 0; 601 602 /* Set approximate I/O buffer size. */ 603 if (packet_is_interactive()) 604 buffer_high = 4096; 605 else 606 buffer_high = 64 * 1024; 607 608 #if 0 609 /* Initialize max_fd to the maximum of the known file descriptors. */ 610 max_fd = MAX(connection_in, connection_out); 611 max_fd = MAX(max_fd, fdin); 612 max_fd = MAX(max_fd, fdout); 613 if (fderr != -1) 614 max_fd = MAX(max_fd, fderr); 615 #endif 616 617 /* Initialize Initialize buffers. */ 618 buffer_init(&stdin_buffer); 619 buffer_init(&stdout_buffer); 620 buffer_init(&stderr_buffer); 621 622 /* 623 * If we have no separate fderr (which is the case when we have a pty 624 * - there we cannot make difference between data sent to stdout and 625 * stderr), indicate that we have seen an EOF from stderr. This way 626 * we don't need to check the descriptor everywhere. 627 */ 628 if (fderr == -1) 629 fderr_eof = 1; 630 631 server_init_dispatch(); 632 633 /* Main loop of the server for the interactive session mode. */ 634 for (;;) { 635 636 /* Process buffered packets from the client. */ 637 process_buffered_input_packets(); 638 639 /* 640 * If we have received eof, and there is no more pending 641 * input data, cause a real eof by closing fdin. 642 */ 643 if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) { 644 if (fdin != fdout) 645 close(fdin); 646 else 647 shutdown(fdin, SHUT_WR); /* We will no longer send. */ 648 fdin = -1; 649 } 650 /* Make packets from buffered stderr data to send to the client. */ 651 make_packets_from_stderr_data(); 652 653 /* 654 * Make packets from buffered stdout data to send to the 655 * client. If there is very little to send, this arranges to 656 * not send them now, but to wait a short while to see if we 657 * are getting more data. This is necessary, as some systems 658 * wake up readers from a pty after each separate character. 659 */ 660 max_time_milliseconds = 0; 661 stdout_buffer_bytes = buffer_len(&stdout_buffer); 662 if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 && 663 stdout_buffer_bytes != previous_stdout_buffer_bytes) { 664 /* try again after a while */ 665 max_time_milliseconds = 10; 666 } else { 667 /* Send it now. */ 668 make_packets_from_stdout_data(); 669 } 670 previous_stdout_buffer_bytes = buffer_len(&stdout_buffer); 671 672 /* Send channel data to the client. */ 673 if (packet_not_very_much_data_to_write()) 674 channel_output_poll(); 675 676 /* 677 * Bail out of the loop if the program has closed its output 678 * descriptors, and we have no more data to send to the 679 * client, and there is no pending buffered data. 680 */ 681 if (fdout_eof && fderr_eof && !packet_have_data_to_write() && 682 buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) { 683 if (!channel_still_open()) 684 break; 685 if (!waiting_termination) { 686 const char *s = "Waiting for forwarded connections to terminate...\r\n"; 687 char *cp; 688 waiting_termination = 1; 689 buffer_append(&stderr_buffer, s, strlen(s)); 690 691 /* Display list of open channels. */ 692 cp = channel_open_message(); 693 buffer_append(&stderr_buffer, cp, strlen(cp)); 694 free(cp); 695 } 696 } 697 max_fd = MAX(connection_in, connection_out); 698 max_fd = MAX(max_fd, fdin); 699 max_fd = MAX(max_fd, fdout); 700 max_fd = MAX(max_fd, fderr); 701 max_fd = MAX(max_fd, notify_pipe[0]); 702 703 /* Sleep in select() until we can do something. */ 704 wait_until_can_do_something(&readset, &writeset, &max_fd, 705 &nalloc, max_time_milliseconds); 706 707 if (received_sigterm) { 708 logit("Exiting on signal %d", (int)received_sigterm); 709 /* Clean up sessions, utmp, etc. */ 710 cleanup_exit(255); 711 } 712 713 /* Process any channel events. */ 714 channel_after_select(readset, writeset); 715 716 /* Process input from the client and from program stdout/stderr. */ 717 process_input(readset); 718 719 /* Process output to the client and to program stdin. */ 720 process_output(writeset); 721 } 722 free(readset); 723 free(writeset); 724 725 /* Cleanup and termination code. */ 726 727 /* Wait until all output has been sent to the client. */ 728 drain_output(); 729 730 debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.", 731 stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes); 732 733 /* Free and clear the buffers. */ 734 buffer_free(&stdin_buffer); 735 buffer_free(&stdout_buffer); 736 buffer_free(&stderr_buffer); 737 738 /* Close the file descriptors. */ 739 if (fdout != -1) 740 close(fdout); 741 fdout = -1; 742 fdout_eof = 1; 743 if (fderr != -1) 744 close(fderr); 745 fderr = -1; 746 fderr_eof = 1; 747 if (fdin != -1) 748 close(fdin); 749 fdin = -1; 750 751 channel_free_all(); 752 753 /* We no longer want our SIGCHLD handler to be called. */ 754 mysignal(SIGCHLD, SIG_DFL); 755 756 while ((wait_pid = waitpid(-1, &wait_status, 0)) < 0) 757 if (errno != EINTR) 758 packet_disconnect("wait: %.100s", strerror(errno)); 759 if (wait_pid != pid) 760 error("Strange, wait returned pid %ld, expected %ld", 761 (long)wait_pid, (long)pid); 762 763 /* Check if it exited normally. */ 764 if (WIFEXITED(wait_status)) { 765 /* Yes, normal exit. Get exit status and send it to the client. */ 766 debug("Command exited with status %d.", WEXITSTATUS(wait_status)); 767 packet_start(SSH_SMSG_EXITSTATUS); 768 packet_put_int(WEXITSTATUS(wait_status)); 769 packet_send(); 770 packet_write_wait(); 771 772 /* 773 * Wait for exit confirmation. Note that there might be 774 * other packets coming before it; however, the program has 775 * already died so we just ignore them. The client is 776 * supposed to respond with the confirmation when it receives 777 * the exit status. 778 */ 779 do { 780 type = packet_read(); 781 } 782 while (type != SSH_CMSG_EXIT_CONFIRMATION); 783 784 debug("Received exit confirmation."); 785 return; 786 } 787 /* Check if the program terminated due to a signal. */ 788 if (WIFSIGNALED(wait_status)) 789 packet_disconnect("Command terminated on signal %d.", 790 WTERMSIG(wait_status)); 791 792 /* Some weird exit cause. Just exit. */ 793 packet_disconnect("wait returned status %04x.", wait_status); 794 /* NOTREACHED */ 795 } 796 797 static void 798 collect_children(void) 799 { 800 pid_t pid; 801 sigset_t oset, nset; 802 int status; 803 804 /* block SIGCHLD while we check for dead children */ 805 sigemptyset(&nset); 806 sigaddset(&nset, SIGCHLD); 807 sigprocmask(SIG_BLOCK, &nset, &oset); 808 if (child_terminated) { 809 debug("Received SIGCHLD."); 810 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || 811 (pid < 0 && errno == EINTR)) 812 if (pid > 0) 813 session_close_by_pid(pid, status); 814 child_terminated = 0; 815 } 816 sigprocmask(SIG_SETMASK, &oset, NULL); 817 } 818 819 void 820 server_loop2(Authctxt *authctxt) 821 { 822 fd_set *readset = NULL, *writeset = NULL; 823 int max_fd; 824 u_int nalloc = 0; 825 u_int64_t rekey_timeout_ms = 0; 826 827 debug("Entering interactive session for SSH2."); 828 829 mysignal(SIGCHLD, sigchld_handler); 830 child_terminated = 0; 831 connection_in = packet_get_connection_in(); 832 connection_out = packet_get_connection_out(); 833 834 if (!use_privsep) { 835 signal(SIGTERM, sigterm_handler); 836 signal(SIGINT, sigterm_handler); 837 signal(SIGQUIT, sigterm_handler); 838 } 839 840 notify_setup(); 841 842 max_fd = MAX(connection_in, connection_out); 843 max_fd = MAX(max_fd, notify_pipe[0]); 844 845 server_init_dispatch(); 846 847 for (;;) { 848 process_buffered_input_packets(); 849 850 if (!ssh_packet_is_rekeying(active_state) && 851 packet_not_very_much_data_to_write()) 852 channel_output_poll(); 853 if (options.rekey_interval > 0 && compat20 && 854 !ssh_packet_is_rekeying(active_state)) 855 rekey_timeout_ms = packet_get_rekey_timeout() * 1000; 856 else 857 rekey_timeout_ms = 0; 858 859 wait_until_can_do_something(&readset, &writeset, &max_fd, 860 &nalloc, rekey_timeout_ms); 861 862 if (received_sigterm) { 863 logit("Exiting on signal %d", (int)received_sigterm); 864 /* Clean up sessions, utmp, etc. */ 865 cleanup_exit(255); 866 } 867 868 collect_children(); 869 if (!ssh_packet_is_rekeying(active_state)) 870 channel_after_select(readset, writeset); 871 process_input(readset); 872 if (connection_closed) 873 break; 874 process_output(writeset); 875 } 876 collect_children(); 877 878 free(readset); 879 free(writeset); 880 881 /* free all channels, no more reads and writes */ 882 channel_free_all(); 883 884 /* free remaining sessions, e.g. remove wtmp entries */ 885 session_destroy_all(NULL); 886 } 887 888 static int 889 server_input_keep_alive(int type, u_int32_t seq, void *ctxt) 890 { 891 debug("Got %d/%u for keepalive", type, seq); 892 /* 893 * reset timeout, since we got a sane answer from the client. 894 * even if this was generated by something other than 895 * the bogus CHANNEL_REQUEST we send for keepalives. 896 */ 897 packet_set_alive_timeouts(0); 898 return 0; 899 } 900 901 static int 902 server_input_stdin_data(int type, u_int32_t seq, void *ctxt) 903 { 904 char *data; 905 u_int data_len; 906 907 /* Stdin data from the client. Append it to the buffer. */ 908 /* Ignore any data if the client has closed stdin. */ 909 if (fdin == -1) 910 return 0; 911 data = packet_get_string(&data_len); 912 packet_check_eom(); 913 buffer_append(&stdin_buffer, data, data_len); 914 explicit_bzero(data, data_len); 915 free(data); 916 return 0; 917 } 918 919 static int 920 server_input_eof(int type, u_int32_t seq, void *ctxt) 921 { 922 /* 923 * Eof from the client. The stdin descriptor to the 924 * program will be closed when all buffered data has 925 * drained. 926 */ 927 debug("EOF received for stdin."); 928 packet_check_eom(); 929 stdin_eof = 1; 930 return 0; 931 } 932 933 static int 934 server_input_window_size(int type, u_int32_t seq, void *ctxt) 935 { 936 u_int row = packet_get_int(); 937 u_int col = packet_get_int(); 938 u_int xpixel = packet_get_int(); 939 u_int ypixel = packet_get_int(); 940 941 debug("Window change received."); 942 packet_check_eom(); 943 if (fdin != -1) 944 pty_change_window_size(fdin, row, col, xpixel, ypixel); 945 return 0; 946 } 947 948 static Channel * 949 server_request_direct_tcpip(void) 950 { 951 Channel *c = NULL; 952 char *target, *originator; 953 u_short target_port, originator_port; 954 955 target = packet_get_string(NULL); 956 target_port = packet_get_int(); 957 originator = packet_get_string(NULL); 958 originator_port = packet_get_int(); 959 packet_check_eom(); 960 961 debug("server_request_direct_tcpip: originator %s port %d, target %s " 962 "port %d", originator, originator_port, target, target_port); 963 964 /* XXX fine grained permissions */ 965 if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0 && 966 !no_port_forwarding_flag) { 967 c = channel_connect_to_port(target, target_port, 968 "direct-tcpip", "direct-tcpip"); 969 } else { 970 logit("refused local port forward: " 971 "originator %s port %d, target %s port %d", 972 originator, originator_port, target, target_port); 973 } 974 975 free(originator); 976 free(target); 977 978 return c; 979 } 980 981 static Channel * 982 server_request_direct_streamlocal(void) 983 { 984 Channel *c = NULL; 985 char *target, *originator; 986 u_short originator_port; 987 988 target = packet_get_string(NULL); 989 originator = packet_get_string(NULL); 990 originator_port = packet_get_int(); 991 packet_check_eom(); 992 993 debug("server_request_direct_streamlocal: originator %s port %d, target %s", 994 originator, originator_port, target); 995 996 /* XXX fine grained permissions */ 997 if ((options.allow_streamlocal_forwarding & FORWARD_LOCAL) != 0 && 998 !no_port_forwarding_flag) { 999 c = channel_connect_to_path(target, 1000 "direct-streamlocal@openssh.com", "direct-streamlocal"); 1001 } else { 1002 logit("refused streamlocal port forward: " 1003 "originator %s port %d, target %s", 1004 originator, originator_port, target); 1005 } 1006 1007 free(originator); 1008 free(target); 1009 1010 return c; 1011 } 1012 1013 static Channel * 1014 server_request_tun(void) 1015 { 1016 Channel *c = NULL; 1017 int mode, tun; 1018 int sock; 1019 1020 mode = packet_get_int(); 1021 switch (mode) { 1022 case SSH_TUNMODE_POINTOPOINT: 1023 case SSH_TUNMODE_ETHERNET: 1024 break; 1025 default: 1026 packet_send_debug("Unsupported tunnel device mode."); 1027 return NULL; 1028 } 1029 if ((options.permit_tun & mode) == 0) { 1030 packet_send_debug("Server has rejected tunnel device " 1031 "forwarding"); 1032 return NULL; 1033 } 1034 1035 tun = packet_get_int(); 1036 if (forced_tun_device != -1) { 1037 if (tun != SSH_TUNID_ANY && forced_tun_device != tun) 1038 goto done; 1039 tun = forced_tun_device; 1040 } 1041 sock = tun_open(tun, mode); 1042 if (sock < 0) 1043 goto done; 1044 c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1, 1045 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); 1046 c->datagram = 1; 1047 #if defined(SSH_TUN_FILTER) 1048 if (mode == SSH_TUNMODE_POINTOPOINT) 1049 channel_register_filter(c->self, sys_tun_infilter, 1050 sys_tun_outfilter, NULL, NULL); 1051 #endif 1052 1053 done: 1054 if (c == NULL) 1055 packet_send_debug("Failed to open the tunnel device."); 1056 return c; 1057 } 1058 1059 static Channel * 1060 server_request_session(void) 1061 { 1062 Channel *c; 1063 1064 debug("input_session_request"); 1065 packet_check_eom(); 1066 1067 if (no_more_sessions) { 1068 packet_disconnect("Possible attack: attempt to open a session " 1069 "after additional sessions disabled"); 1070 } 1071 1072 /* 1073 * A server session has no fd to read or write until a 1074 * CHANNEL_REQUEST for a shell is made, so we set the type to 1075 * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all 1076 * CHANNEL_REQUEST messages is registered. 1077 */ 1078 c = channel_new("session", SSH_CHANNEL_LARVAL, 1079 -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT, 1080 0, "server-session", 1); 1081 if (session_open(the_authctxt, c->self) != 1) { 1082 debug("session open failed, free channel %d", c->self); 1083 channel_free(c); 1084 return NULL; 1085 } 1086 channel_register_cleanup(c->self, session_close_by_channel, 0); 1087 return c; 1088 } 1089 1090 static int 1091 server_input_channel_open(int type, u_int32_t seq, void *ctxt) 1092 { 1093 Channel *c = NULL; 1094 char *ctype; 1095 int rchan; 1096 u_int rmaxpack, rwindow, len; 1097 1098 ctype = packet_get_string(&len); 1099 rchan = packet_get_int(); 1100 rwindow = packet_get_int(); 1101 rmaxpack = packet_get_int(); 1102 1103 debug("server_input_channel_open: ctype %s rchan %d win %d max %d", 1104 ctype, rchan, rwindow, rmaxpack); 1105 1106 if (strcmp(ctype, "session") == 0) { 1107 c = server_request_session(); 1108 } else if (strcmp(ctype, "direct-tcpip") == 0) { 1109 c = server_request_direct_tcpip(); 1110 } else if (strcmp(ctype, "direct-streamlocal@openssh.com") == 0) { 1111 c = server_request_direct_streamlocal(); 1112 } else if (strcmp(ctype, "tun@openssh.com") == 0) { 1113 c = server_request_tun(); 1114 } 1115 if (c != NULL) { 1116 debug("server_input_channel_open: confirm %s", ctype); 1117 c->remote_id = rchan; 1118 c->remote_window = rwindow; 1119 c->remote_maxpacket = rmaxpack; 1120 if (c->type != SSH_CHANNEL_CONNECTING) { 1121 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); 1122 packet_put_int(c->remote_id); 1123 packet_put_int(c->self); 1124 packet_put_int(c->local_window); 1125 packet_put_int(c->local_maxpacket); 1126 packet_send(); 1127 } 1128 } else { 1129 debug("server_input_channel_open: failure %s", ctype); 1130 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); 1131 packet_put_int(rchan); 1132 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); 1133 if (!(datafellows & SSH_BUG_OPENFAILURE)) { 1134 packet_put_cstring("open failed"); 1135 packet_put_cstring(""); 1136 } 1137 packet_send(); 1138 } 1139 free(ctype); 1140 return 0; 1141 } 1142 1143 static int 1144 server_input_hostkeys_prove(struct sshbuf **respp) 1145 { 1146 struct ssh *ssh = active_state; /* XXX */ 1147 struct sshbuf *resp = NULL; 1148 struct sshbuf *sigbuf = NULL; 1149 struct sshkey *key = NULL, *key_pub = NULL, *key_prv = NULL; 1150 int r, ndx, success = 0; 1151 const u_char *blob; 1152 u_char *sig = 0; 1153 size_t blen, slen; 1154 1155 if ((resp = sshbuf_new()) == NULL || (sigbuf = sshbuf_new()) == NULL) 1156 fatal("%s: sshbuf_new", __func__); 1157 1158 while (ssh_packet_remaining(ssh) > 0) { 1159 sshkey_free(key); 1160 key = NULL; 1161 if ((r = sshpkt_get_string_direct(ssh, &blob, &blen)) != 0 || 1162 (r = sshkey_from_blob(blob, blen, &key)) != 0) { 1163 error("%s: couldn't parse key: %s", 1164 __func__, ssh_err(r)); 1165 goto out; 1166 } 1167 /* 1168 * Better check that this is actually one of our hostkeys 1169 * before attempting to sign anything with it. 1170 */ 1171 if ((ndx = ssh->kex->host_key_index(key, 1, ssh)) == -1) { 1172 error("%s: unknown host %s key", 1173 __func__, sshkey_type(key)); 1174 goto out; 1175 } 1176 /* 1177 * XXX refactor: make kex->sign just use an index rather 1178 * than passing in public and private keys 1179 */ 1180 if ((key_prv = get_hostkey_by_index(ndx)) == NULL && 1181 (key_pub = get_hostkey_public_by_index(ndx, ssh)) == NULL) { 1182 error("%s: can't retrieve hostkey %d", __func__, ndx); 1183 goto out; 1184 } 1185 sshbuf_reset(sigbuf); 1186 free(sig); 1187 sig = NULL; 1188 if ((r = sshbuf_put_cstring(sigbuf, 1189 "hostkeys-prove-00@openssh.com")) != 0 || 1190 (r = sshbuf_put_string(sigbuf, 1191 ssh->kex->session_id, ssh->kex->session_id_len)) != 0 || 1192 (r = sshkey_puts(key, sigbuf)) != 0 || 1193 (r = ssh->kex->sign(key_prv, key_pub, &sig, &slen, 1194 sshbuf_ptr(sigbuf), sshbuf_len(sigbuf), NULL, 0)) != 0 || 1195 (r = sshbuf_put_string(resp, sig, slen)) != 0) { 1196 error("%s: couldn't prepare signature: %s", 1197 __func__, ssh_err(r)); 1198 goto out; 1199 } 1200 } 1201 /* Success */ 1202 *respp = resp; 1203 resp = NULL; /* don't free it */ 1204 success = 1; 1205 out: 1206 free(sig); 1207 sshbuf_free(resp); 1208 sshbuf_free(sigbuf); 1209 sshkey_free(key); 1210 return success; 1211 } 1212 1213 static int 1214 server_input_global_request(int type, u_int32_t seq, void *ctxt) 1215 { 1216 char *rtype; 1217 int want_reply; 1218 int r, success = 0, allocated_listen_port = 0; 1219 struct sshbuf *resp = NULL; 1220 1221 rtype = packet_get_string(NULL); 1222 want_reply = packet_get_char(); 1223 debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply); 1224 1225 /* -R style forwarding */ 1226 if (strcmp(rtype, "tcpip-forward") == 0) { 1227 struct passwd *pw; 1228 struct Forward fwd; 1229 1230 pw = the_authctxt->pw; 1231 if (pw == NULL || !the_authctxt->valid) 1232 fatal("server_input_global_request: no/invalid user"); 1233 memset(&fwd, 0, sizeof(fwd)); 1234 fwd.listen_host = packet_get_string(NULL); 1235 fwd.listen_port = (u_short)packet_get_int(); 1236 debug("server_input_global_request: tcpip-forward listen %s port %d", 1237 fwd.listen_host, fwd.listen_port); 1238 1239 /* check permissions */ 1240 if ((options.allow_tcp_forwarding & FORWARD_REMOTE) == 0 || 1241 no_port_forwarding_flag || 1242 (!want_reply && fwd.listen_port == 0) 1243 #ifndef NO_IPPORT_RESERVED_CONCEPT 1244 || (fwd.listen_port != 0 && fwd.listen_port < IPPORT_RESERVED && 1245 pw->pw_uid != 0) 1246 #endif 1247 ) { 1248 success = 0; 1249 packet_send_debug("Server has disabled port forwarding."); 1250 } else { 1251 /* Start listening on the port */ 1252 success = channel_setup_remote_fwd_listener(&fwd, 1253 &allocated_listen_port, &options.fwd_opts); 1254 } 1255 free(fwd.listen_host); 1256 if ((resp = sshbuf_new()) == NULL) 1257 fatal("%s: sshbuf_new", __func__); 1258 if (allocated_listen_port != 0 && 1259 (r = sshbuf_put_u32(resp, allocated_listen_port)) != 0) 1260 fatal("%s: sshbuf_put_u32: %s", __func__, ssh_err(r)); 1261 } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) { 1262 struct Forward fwd; 1263 1264 memset(&fwd, 0, sizeof(fwd)); 1265 fwd.listen_host = packet_get_string(NULL); 1266 fwd.listen_port = (u_short)packet_get_int(); 1267 debug("%s: cancel-tcpip-forward addr %s port %d", __func__, 1268 fwd.listen_host, fwd.listen_port); 1269 1270 success = channel_cancel_rport_listener(&fwd); 1271 free(fwd.listen_host); 1272 } else if (strcmp(rtype, "streamlocal-forward@openssh.com") == 0) { 1273 struct Forward fwd; 1274 1275 memset(&fwd, 0, sizeof(fwd)); 1276 fwd.listen_path = packet_get_string(NULL); 1277 debug("server_input_global_request: streamlocal-forward listen path %s", 1278 fwd.listen_path); 1279 1280 /* check permissions */ 1281 if ((options.allow_streamlocal_forwarding & FORWARD_REMOTE) == 0 1282 || no_port_forwarding_flag) { 1283 success = 0; 1284 packet_send_debug("Server has disabled port forwarding."); 1285 } else { 1286 /* Start listening on the socket */ 1287 success = channel_setup_remote_fwd_listener( 1288 &fwd, NULL, &options.fwd_opts); 1289 } 1290 free(fwd.listen_path); 1291 } else if (strcmp(rtype, "cancel-streamlocal-forward@openssh.com") == 0) { 1292 struct Forward fwd; 1293 1294 memset(&fwd, 0, sizeof(fwd)); 1295 fwd.listen_path = packet_get_string(NULL); 1296 debug("%s: cancel-streamlocal-forward path %s", __func__, 1297 fwd.listen_path); 1298 1299 success = channel_cancel_rport_listener(&fwd); 1300 free(fwd.listen_path); 1301 } else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) { 1302 no_more_sessions = 1; 1303 success = 1; 1304 } else if (strcmp(rtype, "hostkeys-prove-00@openssh.com") == 0) { 1305 success = server_input_hostkeys_prove(&resp); 1306 } 1307 if (want_reply) { 1308 packet_start(success ? 1309 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); 1310 if (success && resp != NULL) 1311 ssh_packet_put_raw(active_state, sshbuf_ptr(resp), 1312 sshbuf_len(resp)); 1313 packet_send(); 1314 packet_write_wait(); 1315 } 1316 free(rtype); 1317 sshbuf_free(resp); 1318 return 0; 1319 } 1320 1321 static int 1322 server_input_channel_req(int type, u_int32_t seq, void *ctxt) 1323 { 1324 Channel *c; 1325 int id, reply, success = 0; 1326 char *rtype; 1327 1328 id = packet_get_int(); 1329 rtype = packet_get_string(NULL); 1330 reply = packet_get_char(); 1331 1332 debug("server_input_channel_req: channel %d request %s reply %d", 1333 id, rtype, reply); 1334 1335 if ((c = channel_lookup(id)) == NULL) 1336 packet_disconnect("server_input_channel_req: " 1337 "unknown channel %d", id); 1338 if (!strcmp(rtype, "eow@openssh.com")) { 1339 packet_check_eom(); 1340 chan_rcvd_eow(c); 1341 } else if ((c->type == SSH_CHANNEL_LARVAL || 1342 c->type == SSH_CHANNEL_OPEN) && strcmp(c->ctype, "session") == 0) 1343 success = session_input_channel_req(c, rtype); 1344 if (reply && !(c->flags & CHAN_CLOSE_SENT)) { 1345 packet_start(success ? 1346 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); 1347 packet_put_int(c->remote_id); 1348 packet_send(); 1349 } 1350 free(rtype); 1351 return 0; 1352 } 1353 1354 static void 1355 server_init_dispatch_20(void) 1356 { 1357 debug("server_init_dispatch_20"); 1358 dispatch_init(&dispatch_protocol_error); 1359 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); 1360 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); 1361 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); 1362 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); 1363 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open); 1364 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 1365 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 1366 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req); 1367 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); 1368 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request); 1369 /* client_alive */ 1370 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &server_input_keep_alive); 1371 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive); 1372 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive); 1373 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive); 1374 /* rekeying */ 1375 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); 1376 } 1377 static void 1378 server_init_dispatch_13(void) 1379 { 1380 debug("server_init_dispatch_13"); 1381 dispatch_init(NULL); 1382 dispatch_set(SSH_CMSG_EOF, &server_input_eof); 1383 dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data); 1384 dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size); 1385 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); 1386 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); 1387 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); 1388 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); 1389 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); 1390 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); 1391 } 1392 static void 1393 server_init_dispatch_15(void) 1394 { 1395 server_init_dispatch_13(); 1396 debug("server_init_dispatch_15"); 1397 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); 1398 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose); 1399 } 1400 static void 1401 server_init_dispatch(void) 1402 { 1403 if (compat20) 1404 server_init_dispatch_20(); 1405 else if (compat13) 1406 server_init_dispatch_13(); 1407 else 1408 server_init_dispatch_15(); 1409 } 1410