Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.274
1.274 ! djm 1: /* $OpenBSD: clientloop.c,v 1.273 2015/05/04 06:10:48 djm Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 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: *
15: * Copyright (c) 1999 Theo de Raadt. 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.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.266 deraadt 63: #include <sys/param.h> /* MIN MAX */
1.175 deraadt 64: #include <sys/types.h>
1.152 stevesk 65: #include <sys/ioctl.h>
1.154 stevesk 66: #include <sys/stat.h>
1.166 stevesk 67: #include <sys/socket.h>
1.171 stevesk 68: #include <sys/time.h>
1.189 djm 69: #include <sys/queue.h>
1.150 stevesk 70:
1.155 stevesk 71: #include <ctype.h>
1.168 stevesk 72: #include <errno.h>
1.151 stevesk 73: #include <paths.h>
1.153 stevesk 74: #include <signal.h>
1.174 stevesk 75: #include <stdio.h>
1.173 stevesk 76: #include <stdlib.h>
1.170 stevesk 77: #include <string.h>
1.150 stevesk 78: #include <termios.h>
1.175 deraadt 79: #include <pwd.h>
1.169 stevesk 80: #include <unistd.h>
1.266 deraadt 81: #include <limits.h>
1.1 deraadt 82:
1.175 deraadt 83: #include "xmalloc.h"
1.45 markus 84: #include "ssh.h"
85: #include "ssh1.h"
86: #include "ssh2.h"
1.1 deraadt 87: #include "packet.h"
88: #include "buffer.h"
1.15 markus 89: #include "compat.h"
1.74 markus 90: #include "channels.h"
1.15 markus 91: #include "dispatch.h"
1.40 markus 92: #include "key.h"
1.175 deraadt 93: #include "cipher.h"
1.54 markus 94: #include "kex.h"
1.45 markus 95: #include "log.h"
1.261 millert 96: #include "misc.h"
1.45 markus 97: #include "readconf.h"
98: #include "clientloop.h"
1.147 djm 99: #include "sshconnect.h"
1.40 markus 100: #include "authfd.h"
1.45 markus 101: #include "atomicio.h"
1.118 deraadt 102: #include "sshpty.h"
1.123 djm 103: #include "match.h"
104: #include "msg.h"
1.212 andreas 105: #include "roaming.h"
1.262 djm 106: #include "ssherr.h"
1.267 djm 107: #include "hostfile.h"
1.39 markus 108:
109: /* import options */
110: extern Options options;
111:
1.1 deraadt 112: /* Flag indicating that stdin should be redirected from /dev/null. */
113: extern int stdin_null_flag;
114:
1.116 dtucker 115: /* Flag indicating that no shell has been requested */
116: extern int no_shell_flag;
117:
1.123 djm 118: /* Control socket */
1.217 djm 119: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 120:
1.13 markus 121: /*
122: * Name of the host we are connecting to. This is the name given on the
123: * command line, or the HostName specified for the user-supplied name in a
124: * configuration file.
125: */
1.1 deraadt 126: extern char *host;
127:
1.13 markus 128: /*
129: * Flag to indicate that we have received a window change signal which has
130: * not yet been processed. This will cause a message indicating the new
131: * window size to be sent to the server a little later. This is volatile
132: * because this is updated in a signal handler.
133: */
1.88 markus 134: static volatile sig_atomic_t received_window_change_signal = 0;
135: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 136:
1.145 djm 137: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 138: static int in_non_blocking_mode = 0;
139:
1.222 djm 140: /* Time when backgrounded control master using ControlPersist should exit */
141: static time_t control_persist_exit_time = 0;
142:
1.1 deraadt 143: /* Common data for the client loop code. */
1.217 djm 144: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.195 djm 145: static int escape_char1; /* Escape character. (proto1 only) */
146: static int escape_pending1; /* Last character was an escape (proto1 only) */
1.11 markus 147: static int last_was_cr; /* Last character was a newline. */
1.197 djm 148: static int exit_status; /* Used to store the command exit status. */
149: static int stdin_eof; /* EOF has been encountered on stderr. */
1.11 markus 150: static Buffer stdin_buffer; /* Buffer for stdin data. */
151: static Buffer stdout_buffer; /* Buffer for stdout data. */
152: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.221 djm 153: static u_int buffer_high; /* Soft max buffer size. */
1.11 markus 154: static int connection_in; /* Connection to server (input). */
155: static int connection_out; /* Connection to server (output). */
1.56 markus 156: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 157: static int session_closed; /* In SSH2: login session closed. */
1.274 ! djm 158: static u_int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.1 deraadt 159:
1.77 itojun 160: static void client_init_dispatch(void);
1.16 markus 161: int session_ident = -1;
162:
1.214 andreas 163: int session_resumed = 0;
164:
1.195 djm 165: /* Track escape per proto2 channel */
166: struct escape_filter_ctx {
167: int escape_pending;
168: int escape_char;
169: };
170:
171: /* Context for channel confirmation replies */
1.190 djm 172: struct channel_reply_ctx {
173: const char *request_type;
1.234 djm 174: int id;
175: enum confirm_action action;
1.190 djm 176: };
177:
1.196 djm 178: /* Global request success/failure callbacks */
179: struct global_confirm {
180: TAILQ_ENTRY(global_confirm) entry;
181: global_confirm_cb *cb;
182: void *ctx;
183: int ref_count;
184: };
185: TAILQ_HEAD(global_confirms, global_confirm);
186: static struct global_confirms global_confirms =
187: TAILQ_HEAD_INITIALIZER(global_confirms);
188:
1.123 djm 189: void ssh_process_session2_setup(int, int, int, Buffer *);
190:
1.1 deraadt 191: /* Restores stdin to blocking mode. */
192:
1.77 itojun 193: static void
1.49 itojun 194: leave_non_blocking(void)
1.1 deraadt 195: {
1.11 markus 196: if (in_non_blocking_mode) {
1.125 djm 197: unset_nonblock(fileno(stdin));
1.11 markus 198: in_non_blocking_mode = 0;
199: }
1.1 deraadt 200: }
201:
1.11 markus 202: /* Puts stdin terminal in non-blocking mode. */
203:
1.77 itojun 204: static void
1.49 itojun 205: enter_non_blocking(void)
1.1 deraadt 206: {
1.11 markus 207: in_non_blocking_mode = 1;
1.124 djm 208: set_nonblock(fileno(stdin));
1.1 deraadt 209: }
210:
1.13 markus 211: /*
212: * Signal handler for the window change signal (SIGWINCH). This just sets a
213: * flag indicating that the window has changed.
214: */
1.157 deraadt 215: /*ARGSUSED */
1.77 itojun 216: static void
1.11 markus 217: window_change_handler(int sig)
1.1 deraadt 218: {
1.11 markus 219: received_window_change_signal = 1;
220: signal(SIGWINCH, window_change_handler);
1.1 deraadt 221: }
222:
1.13 markus 223: /*
224: * Signal handler for signals that cause the program to terminate. These
225: * signals must be trapped to restore terminal modes.
226: */
1.157 deraadt 227: /*ARGSUSED */
1.77 itojun 228: static void
1.11 markus 229: signal_handler(int sig)
1.1 deraadt 230: {
1.75 markus 231: received_signal = sig;
232: quit_pending = 1;
1.1 deraadt 233: }
234:
1.13 markus 235: /*
236: * Returns current time in seconds from Jan 1, 1970 with the maximum
237: * available resolution.
238: */
1.1 deraadt 239:
1.77 itojun 240: static double
1.49 itojun 241: get_current_time(void)
1.1 deraadt 242: {
1.11 markus 243: struct timeval tv;
244: gettimeofday(&tv, NULL);
245: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 246: }
247:
1.222 djm 248: /*
249: * Sets control_persist_exit_time to the absolute time when the
250: * backgrounded control master should exit due to expiry of the
251: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
252: * control master process, or if there is no ControlPersist timeout.
253: */
254: static void
255: set_control_persist_exit_time(void)
256: {
257: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 258: || options.control_persist_timeout == 0) {
1.222 djm 259: /* not using a ControlPersist timeout */
260: control_persist_exit_time = 0;
1.232 djm 261: } else if (channel_still_open()) {
1.222 djm 262: /* some client connections are still open */
263: if (control_persist_exit_time > 0)
264: debug2("%s: cancel scheduled exit", __func__);
265: control_persist_exit_time = 0;
266: } else if (control_persist_exit_time <= 0) {
267: /* a client connection has recently closed */
1.251 dtucker 268: control_persist_exit_time = monotime() +
1.222 djm 269: (time_t)options.control_persist_timeout;
270: debug2("%s: schedule exit in %d seconds", __func__,
271: options.control_persist_timeout);
272: }
273: /* else we are already counting down to the timeout */
274: }
275:
1.238 dtucker 276: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
277: static int
278: client_x11_display_valid(const char *display)
279: {
280: size_t i, dlen;
281:
282: dlen = strlen(display);
283: for (i = 0; i < dlen; i++) {
1.256 deraadt 284: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 285: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
286: debug("Invalid character '%c' in DISPLAY", display[i]);
287: return 0;
288: }
289: }
290: return 1;
291: }
292:
1.274 ! djm 293: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
! 294: #define X11_TIMEOUT_SLACK 60
1.138 djm 295: void
296: client_x11_get_proto(const char *display, const char *xauth_path,
1.221 djm 297: u_int trusted, u_int timeout, char **_proto, char **_data)
1.138 djm 298: {
299: char cmd[1024];
300: char line[512];
301: char xdisplay[512];
302: static char proto[512], data[512];
303: FILE *f;
304: int got_data = 0, generated = 0, do_unlink = 0, i;
305: char *xauthdir, *xauthfile;
306: struct stat st;
1.274 ! djm 307: u_int now, x11_timeout_real;
1.138 djm 308:
309: xauthdir = xauthfile = NULL;
310: *_proto = proto;
311: *_data = data;
312: proto[0] = data[0] = '\0';
313:
314: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
315: debug("No xauth program.");
1.238 dtucker 316: } else if (!client_x11_display_valid(display)) {
317: logit("DISPLAY '%s' invalid, falling back to fake xauth data",
318: display);
1.138 djm 319: } else {
320: if (display == NULL) {
321: debug("x11_get_proto: DISPLAY not set");
322: return;
323: }
324: /*
325: * Handle FamilyLocal case where $DISPLAY does
326: * not match an authorization entry. For this we
327: * just try "xauth list unix:displaynum.screennum".
328: * XXX: "localhost" match to determine FamilyLocal
329: * is not perfect.
330: */
331: if (strncmp(display, "localhost:", 10) == 0) {
332: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
333: display + 10);
334: display = xdisplay;
335: }
336: if (trusted == 0) {
1.266 deraadt 337: xauthdir = xmalloc(PATH_MAX);
338: xauthfile = xmalloc(PATH_MAX);
339: mktemp_proto(xauthdir, PATH_MAX);
1.274 ! djm 340: /*
! 341: * The authentication cookie should briefly outlive
! 342: * ssh's willingness to forward X11 connections to
! 343: * avoid nasty fail-open behaviour in the X server.
! 344: */
! 345: if (timeout >= UINT_MAX - X11_TIMEOUT_SLACK)
! 346: x11_timeout_real = UINT_MAX;
! 347: else
! 348: x11_timeout_real = timeout + X11_TIMEOUT_SLACK;
1.138 djm 349: if (mkdtemp(xauthdir) != NULL) {
350: do_unlink = 1;
1.266 deraadt 351: snprintf(xauthfile, PATH_MAX, "%s/xauthfile",
1.138 djm 352: xauthdir);
353: snprintf(cmd, sizeof(cmd),
354: "%s -f %s generate %s " SSH_X11_PROTO
1.221 djm 355: " untrusted timeout %u 2>" _PATH_DEVNULL,
1.274 ! djm 356: xauth_path, xauthfile, display,
! 357: x11_timeout_real);
1.138 djm 358: debug2("x11_get_proto: %s", cmd);
1.221 djm 359: if (x11_refuse_time == 0) {
1.251 dtucker 360: now = monotime() + 1;
1.221 djm 361: if (UINT_MAX - timeout < now)
362: x11_refuse_time = UINT_MAX;
363: else
364: x11_refuse_time = now + timeout;
1.274 ! djm 365: channel_set_x11_refuse_time(
! 366: x11_refuse_time);
1.221 djm 367: }
1.274 ! djm 368: if (system(cmd) == 0)
! 369: generated = 1;
1.138 djm 370: }
371: }
1.181 markus 372:
373: /*
374: * When in untrusted mode, we read the cookie only if it was
375: * successfully generated as an untrusted one in the step
376: * above.
377: */
378: if (trusted || generated) {
379: snprintf(cmd, sizeof(cmd),
380: "%s %s%s list %s 2>" _PATH_DEVNULL,
381: xauth_path,
382: generated ? "-f " : "" ,
383: generated ? xauthfile : "",
384: display);
385: debug2("x11_get_proto: %s", cmd);
386: f = popen(cmd, "r");
387: if (f && fgets(line, sizeof(line), f) &&
388: sscanf(line, "%*s %511s %511s", proto, data) == 2)
389: got_data = 1;
390: if (f)
391: pclose(f);
392: } else
393: error("Warning: untrusted X11 forwarding setup failed: "
394: "xauth key data not generated");
1.138 djm 395: }
396:
397: if (do_unlink) {
398: unlink(xauthfile);
399: rmdir(xauthdir);
400: }
1.250 djm 401: free(xauthdir);
402: free(xauthfile);
1.138 djm 403:
404: /*
405: * If we didn't get authentication data, just make up some
406: * data. The forwarding code will check the validity of the
407: * response anyway, and substitute this data. The X11
408: * server, however, will ignore this fake data and use
409: * whatever authentication mechanisms it was using otherwise
410: * for the local connection.
411: */
412: if (!got_data) {
413: u_int32_t rnd = 0;
414:
415: logit("Warning: No xauth data; "
416: "using fake authentication data for X11 forwarding.");
417: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
418: for (i = 0; i < 16; i++) {
419: if (i % 4 == 0)
420: rnd = arc4random();
421: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
422: rnd & 0xff);
423: rnd >>= 8;
424: }
425: }
1.1 deraadt 426: }
427:
1.13 markus 428: /*
429: * This is called when the interactive is entered. This checks if there is
430: * an EOF coming on stdin. We must check this explicitly, as select() does
431: * not appear to wake up when redirecting from /dev/null.
432: */
1.1 deraadt 433:
1.77 itojun 434: static void
1.49 itojun 435: client_check_initial_eof_on_stdin(void)
1.1 deraadt 436: {
1.11 markus 437: int len;
438: char buf[1];
1.1 deraadt 439:
1.13 markus 440: /*
441: * If standard input is to be "redirected from /dev/null", we simply
442: * mark that we have seen an EOF and send an EOF message to the
443: * server. Otherwise, we try to read a single character; it appears
444: * that for some files, such /dev/null, select() never wakes up for
445: * read for this descriptor, which means that we never get EOF. This
446: * way we will get the EOF if stdin comes from /dev/null or similar.
447: */
1.11 markus 448: if (stdin_null_flag) {
449: /* Fake EOF on stdin. */
450: debug("Sending eof.");
451: stdin_eof = 1;
452: packet_start(SSH_CMSG_EOF);
453: packet_send();
454: } else {
455: enter_non_blocking();
456:
457: /* Check for immediate EOF on stdin. */
458: len = read(fileno(stdin), buf, 1);
459: if (len == 0) {
1.197 djm 460: /*
461: * EOF. Record that we have seen it and send
462: * EOF to server.
463: */
1.11 markus 464: debug("Sending eof.");
465: stdin_eof = 1;
466: packet_start(SSH_CMSG_EOF);
467: packet_send();
468: } else if (len > 0) {
1.13 markus 469: /*
470: * Got data. We must store the data in the buffer,
471: * and also process it as an escape character if
472: * appropriate.
473: */
1.195 djm 474: if ((u_char) buf[0] == escape_char1)
475: escape_pending1 = 1;
1.52 markus 476: else
1.11 markus 477: buffer_append(&stdin_buffer, buf, 1);
478: }
479: leave_non_blocking();
480: }
1.1 deraadt 481: }
482:
483:
1.13 markus 484: /*
485: * Make packets from buffered stdin data, and buffer them for sending to the
486: * connection.
487: */
1.1 deraadt 488:
1.77 itojun 489: static void
1.49 itojun 490: client_make_packets_from_stdin_data(void)
1.1 deraadt 491: {
1.42 markus 492: u_int len;
1.1 deraadt 493:
1.11 markus 494: /* Send buffered stdin data to the server. */
495: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 496: packet_not_very_much_data_to_write()) {
1.11 markus 497: len = buffer_len(&stdin_buffer);
498: /* Keep the packets at reasonable size. */
499: if (len > packet_get_maxsize())
500: len = packet_get_maxsize();
501: packet_start(SSH_CMSG_STDIN_DATA);
502: packet_put_string(buffer_ptr(&stdin_buffer), len);
503: packet_send();
504: buffer_consume(&stdin_buffer, len);
505: /* If we have a pending EOF, send it now. */
506: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
507: packet_start(SSH_CMSG_EOF);
508: packet_send();
509: }
1.1 deraadt 510: }
511: }
512:
1.13 markus 513: /*
514: * Checks if the client window has changed, and sends a packet about it to
515: * the server if so. The actual change is detected elsewhere (by a software
516: * interrupt on Unix); this just checks the flag and sends a message if
517: * appropriate.
518: */
1.1 deraadt 519:
1.77 itojun 520: static void
1.49 itojun 521: client_check_window_change(void)
1.1 deraadt 522: {
1.16 markus 523: struct winsize ws;
524:
525: if (! received_window_change_signal)
526: return;
527: /** XXX race */
528: received_window_change_signal = 0;
529:
1.37 markus 530: debug2("client_check_window_change: changed");
1.16 markus 531:
532: if (compat20) {
1.123 djm 533: channel_send_window_changes();
1.16 markus 534: } else {
1.123 djm 535: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
536: return;
1.16 markus 537: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 538: packet_put_int((u_int)ws.ws_row);
539: packet_put_int((u_int)ws.ws_col);
540: packet_put_int((u_int)ws.ws_xpixel);
541: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 542: packet_send();
1.1 deraadt 543: }
544: }
545:
1.264 markus 546: static int
1.117 markus 547: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
548: {
1.196 djm 549: struct global_confirm *gc;
550:
551: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 552: return 0;
1.196 djm 553: if (gc->cb != NULL)
554: gc->cb(type, seq, gc->ctx);
555: if (--gc->ref_count <= 0) {
556: TAILQ_REMOVE(&global_confirms, gc, entry);
1.257 tedu 557: explicit_bzero(gc, sizeof(*gc));
1.250 djm 558: free(gc);
1.196 djm 559: }
560:
1.210 andreas 561: packet_set_alive_timeouts(0);
1.264 markus 562: return 0;
1.117 markus 563: }
564:
565: static void
566: server_alive_check(void)
567: {
1.210 andreas 568: if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
1.228 djm 569: logit("Timeout, server %s not responding.", host);
1.176 markus 570: cleanup_exit(255);
571: }
1.117 markus 572: packet_start(SSH2_MSG_GLOBAL_REQUEST);
573: packet_put_cstring("keepalive@openssh.com");
574: packet_put_char(1); /* boolean: want reply */
575: packet_send();
1.196 djm 576: /* Insert an empty placeholder to maintain ordering */
577: client_register_global_confirm(NULL, NULL);
1.117 markus 578: }
579:
1.13 markus 580: /*
581: * Waits until the client can do something (some data becomes available on
582: * one of the file descriptors).
583: */
1.77 itojun 584: static void
1.46 markus 585: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 586: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 587: {
1.117 markus 588: struct timeval tv, *tvp;
1.222 djm 589: int timeout_secs;
1.251 dtucker 590: time_t minwait_secs = 0, server_alive_time = 0, now = monotime();
1.117 markus 591: int ret;
592:
1.46 markus 593: /* Add any selections by the channel mechanism. */
1.239 djm 594: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp,
595: &minwait_secs, rekeying);
1.11 markus 596:
1.16 markus 597: if (!compat20) {
1.17 markus 598: /* Read from the connection, unless our buffers are full. */
1.16 markus 599: if (buffer_len(&stdout_buffer) < buffer_high &&
600: buffer_len(&stderr_buffer) < buffer_high &&
601: channel_not_very_much_buffered_data())
1.46 markus 602: FD_SET(connection_in, *readsetp);
1.17 markus 603: /*
604: * Read from stdin, unless we have seen EOF or have very much
605: * buffered data to send to the server.
606: */
607: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 608: FD_SET(fileno(stdin), *readsetp);
1.17 markus 609:
610: /* Select stdout/stderr if have data in buffer. */
611: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 612: FD_SET(fileno(stdout), *writesetp);
1.17 markus 613: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 614: FD_SET(fileno(stderr), *writesetp);
1.16 markus 615: } else {
1.71 markus 616: /* channel_prepare_select could have closed the last channel */
1.84 markus 617: if (session_closed && !channel_still_open() &&
618: !packet_have_data_to_write()) {
619: /* clear mask since we did not call select() */
1.87 markus 620: memset(*readsetp, 0, *nallocp);
621: memset(*writesetp, 0, *nallocp);
1.84 markus 622: return;
1.71 markus 623: } else {
624: FD_SET(connection_in, *readsetp);
625: }
1.16 markus 626: }
1.11 markus 627:
628: /* Select server connection if have data to write to the server. */
629: if (packet_have_data_to_write())
1.46 markus 630: FD_SET(connection_out, *writesetp);
1.11 markus 631:
1.13 markus 632: /*
633: * Wait for something to happen. This will suspend the process until
634: * some selected descriptor can be read, written, or has some other
1.222 djm 635: * event pending, or a timeout expires.
1.13 markus 636: */
1.11 markus 637:
1.222 djm 638: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.249 dtucker 639: if (options.server_alive_interval > 0 && compat20) {
1.222 djm 640: timeout_secs = options.server_alive_interval;
1.249 dtucker 641: server_alive_time = now + options.server_alive_interval;
642: }
643: if (options.rekey_interval > 0 && compat20 && !rekeying)
644: timeout_secs = MIN(timeout_secs, packet_get_rekey_timeout());
1.222 djm 645: set_control_persist_exit_time();
646: if (control_persist_exit_time > 0) {
647: timeout_secs = MIN(timeout_secs,
1.249 dtucker 648: control_persist_exit_time - now);
1.222 djm 649: if (timeout_secs < 0)
650: timeout_secs = 0;
651: }
1.239 djm 652: if (minwait_secs != 0)
653: timeout_secs = MIN(timeout_secs, (int)minwait_secs);
1.222 djm 654: if (timeout_secs == INT_MAX)
1.117 markus 655: tvp = NULL;
1.129 deraadt 656: else {
1.222 djm 657: tv.tv_sec = timeout_secs;
1.117 markus 658: tv.tv_usec = 0;
659: tvp = &tv;
660: }
1.222 djm 661:
1.117 markus 662: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
663: if (ret < 0) {
1.11 markus 664: char buf[100];
1.51 markus 665:
666: /*
667: * We have to clear the select masks, because we return.
668: * We have to return, because the mainloop checks for the flags
669: * set by the signal handlers.
670: */
1.87 markus 671: memset(*readsetp, 0, *nallocp);
672: memset(*writesetp, 0, *nallocp);
1.50 deraadt 673:
1.11 markus 674: if (errno == EINTR)
675: return;
676: /* Note: we might still have data in the buffers. */
677: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
678: buffer_append(&stderr_buffer, buf, strlen(buf));
679: quit_pending = 1;
1.249 dtucker 680: } else if (ret == 0) {
681: /*
682: * Timeout. Could have been either keepalive or rekeying.
683: * Keepalive we check here, rekeying is checked in clientloop.
684: */
1.251 dtucker 685: if (server_alive_time != 0 && server_alive_time <= monotime())
1.249 dtucker 686: server_alive_check();
687: }
688:
1.11 markus 689: }
690:
1.77 itojun 691: static void
1.31 markus 692: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 693: {
1.11 markus 694: /* Flush stdout and stderr buffers. */
1.31 markus 695: if (buffer_len(bout) > 0)
1.197 djm 696: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
697: buffer_len(bout));
1.31 markus 698: if (buffer_len(berr) > 0)
1.197 djm 699: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
700: buffer_len(berr));
1.11 markus 701:
1.233 djm 702: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 703:
1.13 markus 704: /*
705: * Free (and clear) the buffer to reduce the amount of data that gets
706: * written to swap.
707: */
1.31 markus 708: buffer_free(bin);
709: buffer_free(bout);
710: buffer_free(berr);
1.11 markus 711:
712: /* Send the suspend signal to the program itself. */
713: kill(getpid(), SIGTSTP);
714:
1.132 djm 715: /* Reset window sizes in case they have changed */
716: received_window_change_signal = 1;
1.11 markus 717:
718: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 719: buffer_init(bin);
720: buffer_init(bout);
721: buffer_init(berr);
1.11 markus 722:
1.233 djm 723: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 724: }
725:
1.77 itojun 726: static void
1.161 deraadt 727: client_process_net_input(fd_set *readset)
1.11 markus 728: {
1.212 andreas 729: int len, cont = 0;
1.17 markus 730: char buf[8192];
1.11 markus 731:
1.13 markus 732: /*
733: * Read input from the server, and add any such data to the buffer of
734: * the packet subsystem.
735: */
1.11 markus 736: if (FD_ISSET(connection_in, readset)) {
737: /* Read as much as possible. */
1.212 andreas 738: len = roaming_read(connection_in, buf, sizeof(buf), &cont);
739: if (len == 0 && cont == 0) {
1.197 djm 740: /*
741: * Received EOF. The remote host has closed the
742: * connection.
743: */
744: snprintf(buf, sizeof buf,
745: "Connection to %.300s closed by remote host.\r\n",
746: host);
1.1 deraadt 747: buffer_append(&stderr_buffer, buf, strlen(buf));
748: quit_pending = 1;
749: return;
1.11 markus 750: }
1.13 markus 751: /*
752: * There is a kernel bug on Solaris that causes select to
753: * sometimes wake up even though there is no data available.
754: */
1.53 millert 755: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 756: len = 0;
757:
758: if (len < 0) {
1.197 djm 759: /*
760: * An error has encountered. Perhaps there is a
761: * network problem.
762: */
763: snprintf(buf, sizeof buf,
764: "Read from remote host %.300s: %.100s\r\n",
765: host, strerror(errno));
1.11 markus 766: buffer_append(&stderr_buffer, buf, strlen(buf));
767: quit_pending = 1;
768: return;
769: }
770: packet_process_incoming(buf, len);
771: }
1.17 markus 772: }
1.16 markus 773:
1.97 jakob 774: static void
1.190 djm 775: client_status_confirm(int type, Channel *c, void *ctx)
1.123 djm 776: {
1.190 djm 777: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
778: char errmsg[256];
779: int tochan;
780:
1.234 djm 781: /*
782: * If a TTY was explicitly requested, then a failure to allocate
783: * one is fatal.
784: */
785: if (cr->action == CONFIRM_TTY &&
786: (options.request_tty == REQUEST_TTY_FORCE ||
787: options.request_tty == REQUEST_TTY_YES))
788: cr->action = CONFIRM_CLOSE;
789:
1.190 djm 790: /* XXX supress on mux _client_ quietmode */
791: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 792: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 793:
794: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
795: debug2("%s request accepted on channel %d",
796: cr->request_type, c->self);
797: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
798: if (tochan) {
799: snprintf(errmsg, sizeof(errmsg),
800: "%s request failed\r\n", cr->request_type);
801: } else {
802: snprintf(errmsg, sizeof(errmsg),
803: "%s request failed on channel %d",
804: cr->request_type, c->self);
805: }
806: /* If error occurred on primary session channel, then exit */
1.234 djm 807: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 808: fatal("%s", errmsg);
1.234 djm 809: /*
810: * If error occurred on mux client, append to
811: * their stderr.
812: */
813: if (tochan) {
814: buffer_append(&c->extended, errmsg,
815: strlen(errmsg));
816: } else
1.190 djm 817: error("%s", errmsg);
1.234 djm 818: if (cr->action == CONFIRM_TTY) {
819: /*
820: * If a TTY allocation error occurred, then arrange
821: * for the correct TTY to leave raw mode.
822: */
823: if (c->self == session_ident)
824: leave_raw_mode(0);
825: else
826: mux_tty_alloc_failed(c);
827: } else if (cr->action == CONFIRM_CLOSE) {
1.190 djm 828: chan_read_failed(c);
829: chan_write_failed(c);
830: }
831: }
1.250 djm 832: free(cr);
1.190 djm 833: }
834:
835: static void
836: client_abandon_status_confirm(Channel *c, void *ctx)
837: {
1.250 djm 838: free(ctx);
1.190 djm 839: }
1.129 deraadt 840:
1.236 djm 841: void
1.234 djm 842: client_expect_confirm(int id, const char *request,
843: enum confirm_action action)
1.190 djm 844: {
1.255 djm 845: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 846:
1.190 djm 847: cr->request_type = request;
1.234 djm 848: cr->action = action;
1.123 djm 849:
1.190 djm 850: channel_register_status_confirm(id, client_status_confirm,
851: client_abandon_status_confirm, cr);
1.196 djm 852: }
853:
854: void
855: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
856: {
1.201 djm 857: struct global_confirm *gc, *last_gc;
1.196 djm 858:
859: /* Coalesce identical callbacks */
1.201 djm 860: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
861: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
862: if (++last_gc->ref_count >= INT_MAX)
863: fatal("%s: last_gc->ref_count = %d",
864: __func__, last_gc->ref_count);
1.196 djm 865: return;
866: }
867:
1.255 djm 868: gc = xcalloc(1, sizeof(*gc));
1.196 djm 869: gc->cb = cb;
870: gc->ctx = ctx;
871: gc->ref_count = 1;
872: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 873: }
874:
875: static void
1.99 markus 876: process_cmdline(void)
1.97 jakob 877: {
878: void (*handler)(int);
1.261 millert 879: char *s, *cmd;
880: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
881: struct Forward fwd;
1.97 jakob 882:
1.257 tedu 883: memset(&fwd, 0, sizeof(fwd));
1.183 djm 884:
1.233 djm 885: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 886: handler = signal(SIGINT, SIG_IGN);
1.99 markus 887: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 888: if (s == NULL)
889: goto out;
1.256 deraadt 890: while (isspace((u_char)*s))
1.97 jakob 891: s++;
1.121 djm 892: if (*s == '-')
893: s++; /* Skip cmdline '-', if any */
1.120 dtucker 894: if (*s == '\0')
1.97 jakob 895: goto out;
1.121 djm 896:
1.122 djm 897: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 898: logit("Commands:");
1.164 djm 899: logit(" -L[bind_address:]port:host:hostport "
900: "Request local forward");
901: logit(" -R[bind_address:]port:host:hostport "
902: "Request remote forward");
1.204 stevesk 903: logit(" -D[bind_address:]port "
904: "Request dynamic forward");
1.237 markus 905: logit(" -KL[bind_address:]port "
906: "Cancel local forward");
1.165 stevesk 907: logit(" -KR[bind_address:]port "
1.164 djm 908: "Cancel remote forward");
1.237 markus 909: logit(" -KD[bind_address:]port "
910: "Cancel dynamic forward");
1.146 reyk 911: if (!options.permit_local_command)
912: goto out;
1.164 djm 913: logit(" !args "
914: "Execute local command");
1.146 reyk 915: goto out;
916: }
917:
918: if (*s == '!' && options.permit_local_command) {
919: s++;
920: ssh_local_cmd(s);
1.121 djm 921: goto out;
922: }
923:
924: if (*s == 'K') {
925: delete = 1;
926: s++;
927: }
1.204 stevesk 928: if (*s == 'L')
929: local = 1;
930: else if (*s == 'R')
931: remote = 1;
932: else if (*s == 'D')
933: dynamic = 1;
934: else {
1.109 itojun 935: logit("Invalid command.");
1.97 jakob 936: goto out;
937: }
1.204 stevesk 938:
1.237 markus 939: if (delete && !compat20) {
1.109 itojun 940: logit("Not supported for SSH protocol version 1.");
1.97 jakob 941: goto out;
942: }
1.121 djm 943:
1.256 deraadt 944: while (isspace((u_char)*++s))
1.179 tedu 945: ;
1.97 jakob 946:
1.217 djm 947: /* XXX update list of forwards in options */
1.121 djm 948: if (delete) {
1.261 millert 949: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
950: if (!parse_forward(&fwd, s, 1, 0)) {
951: logit("Bad forwarding close specification.");
1.121 djm 952: goto out;
953: }
1.237 markus 954: if (remote)
1.261 millert 955: ok = channel_request_rforward_cancel(&fwd) == 0;
1.237 markus 956: else if (dynamic)
1.261 millert 957: ok = channel_cancel_lport_listener(&fwd,
958: 0, &options.fwd_opts) > 0;
1.237 markus 959: else
1.261 millert 960: ok = channel_cancel_lport_listener(&fwd,
961: CHANNEL_CANCEL_PORT_STATIC,
962: &options.fwd_opts) > 0;
1.237 markus 963: if (!ok) {
964: logit("Unkown port forwarding.");
965: goto out;
966: }
967: logit("Canceled forwarding.");
1.121 djm 968: } else {
1.209 djm 969: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 970: logit("Bad forwarding specification.");
971: goto out;
972: }
1.204 stevesk 973: if (local || dynamic) {
1.261 millert 974: if (!channel_setup_local_fwd_listener(&fwd,
975: &options.fwd_opts)) {
1.121 djm 976: logit("Port forwarding failed.");
977: goto out;
978: }
1.135 djm 979: } else {
1.261 millert 980: if (channel_request_remote_forwarding(&fwd) < 0) {
1.167 markus 981: logit("Port forwarding failed.");
982: goto out;
983: }
1.135 djm 984: }
1.121 djm 985: logit("Forwarding port.");
986: }
987:
1.97 jakob 988: out:
989: signal(SIGINT, handler);
1.233 djm 990: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 991: free(cmd);
992: free(fwd.listen_host);
1.261 millert 993: free(fwd.listen_path);
1.250 djm 994: free(fwd.connect_host);
1.261 millert 995: free(fwd.connect_path);
1.97 jakob 996: }
997:
1.244 dtucker 998: /* reasons to suppress output of an escape command in help output */
999: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1000: #define SUPPRESS_PROTO1 1 /* don't show in protocol 1 sessions */
1001: #define SUPPRESS_MUXCLIENT 2 /* don't show in mux client sessions */
1002: #define SUPPRESS_MUXMASTER 4 /* don't show in mux master sessions */
1003: #define SUPPRESS_SYSLOG 8 /* don't show when logging to syslog */
1004: struct escape_help_text {
1005: const char *cmd;
1006: const char *text;
1007: unsigned int flags;
1008: };
1009: static struct escape_help_text esc_txt[] = {
1010: {".", "terminate session", SUPPRESS_MUXMASTER},
1011: {".", "terminate connection (and any multiplexed sessions)",
1012: SUPPRESS_MUXCLIENT},
1013: {"B", "send a BREAK to the remote system", SUPPRESS_PROTO1},
1014: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1015: {"R", "request rekey", SUPPRESS_PROTO1},
1.246 dtucker 1016: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 1017: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
1018: {"#", "list forwarded connections", SUPPRESS_NEVER},
1019: {"&", "background ssh (when waiting for connections to terminate)",
1020: SUPPRESS_MUXCLIENT},
1021: {"?", "this message", SUPPRESS_NEVER},
1022: };
1023:
1024: static void
1025: print_escape_help(Buffer *b, int escape_char, int protocol2, int mux_client,
1026: int using_stderr)
1027: {
1028: unsigned int i, suppress_flags;
1029: char string[1024];
1030:
1031: snprintf(string, sizeof string, "%c?\r\n"
1032: "Supported escape sequences:\r\n", escape_char);
1033: buffer_append(b, string, strlen(string));
1034:
1035: suppress_flags = (protocol2 ? 0 : SUPPRESS_PROTO1) |
1036: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
1037: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
1038: (using_stderr ? 0 : SUPPRESS_SYSLOG);
1039:
1040: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
1041: if (esc_txt[i].flags & suppress_flags)
1042: continue;
1.246 dtucker 1043: snprintf(string, sizeof string, " %c%-3s - %s\r\n",
1.244 dtucker 1044: escape_char, esc_txt[i].cmd, esc_txt[i].text);
1045: buffer_append(b, string, strlen(string));
1046: }
1047:
1048: snprintf(string, sizeof string,
1.246 dtucker 1049: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 1050: "(Note that escapes are only recognized immediately after "
1051: "newline.)\r\n", escape_char, escape_char);
1052: buffer_append(b, string, strlen(string));
1053: }
1054:
1.195 djm 1055: /*
1056: * Process the characters one by one, call with c==NULL for proto1 case.
1057: */
1.77 itojun 1058: static int
1.195 djm 1059: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
1060: char *buf, int len)
1.31 markus 1061: {
1.32 markus 1062: char string[1024];
1.31 markus 1063: pid_t pid;
1064: int bytes = 0;
1.42 markus 1065: u_int i;
1066: u_char ch;
1.31 markus 1067: char *s;
1.195 djm 1068: int *escape_pendingp, escape_char;
1069: struct escape_filter_ctx *efc;
1.31 markus 1070:
1.195 djm 1071: if (c == NULL) {
1072: escape_pendingp = &escape_pending1;
1073: escape_char = escape_char1;
1074: } else {
1075: if (c->filter_ctx == NULL)
1076: return 0;
1077: efc = (struct escape_filter_ctx *)c->filter_ctx;
1078: escape_pendingp = &efc->escape_pending;
1079: escape_char = efc->escape_char;
1080: }
1081:
1.139 djm 1082: if (len <= 0)
1083: return (0);
1084:
1085: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1086: /* Get one character at a time. */
1087: ch = buf[i];
1088:
1.195 djm 1089: if (*escape_pendingp) {
1.31 markus 1090: /* We have previously seen an escape character. */
1091: /* Clear the flag now. */
1.195 djm 1092: *escape_pendingp = 0;
1.31 markus 1093:
1094: /* Process the escaped character. */
1095: switch (ch) {
1096: case '.':
1097: /* Terminate the connection. */
1.195 djm 1098: snprintf(string, sizeof string, "%c.\r\n",
1099: escape_char);
1.32 markus 1100: buffer_append(berr, string, strlen(string));
1.31 markus 1101:
1.217 djm 1102: if (c && c->ctl_chan != -1) {
1.195 djm 1103: chan_read_failed(c);
1104: chan_write_failed(c);
1.252 dtucker 1105: if (c->detach_user)
1106: c->detach_user(c->self, NULL);
1.253 dtucker 1107: c->type = SSH_CHANNEL_ABANDONED;
1108: buffer_clear(&c->input);
1109: chan_ibuf_empty(c);
1.195 djm 1110: return 0;
1111: } else
1112: quit_pending = 1;
1.31 markus 1113: return -1;
1114:
1115: case 'Z' - 64:
1.195 djm 1116: /* XXX support this for mux clients */
1.217 djm 1117: if (c && c->ctl_chan != -1) {
1.245 dtucker 1118: char b[16];
1.195 djm 1119: noescape:
1.245 dtucker 1120: if (ch == 'Z' - 64)
1121: snprintf(b, sizeof b, "^Z");
1122: else
1123: snprintf(b, sizeof b, "%c", ch);
1.195 djm 1124: snprintf(string, sizeof string,
1.245 dtucker 1125: "%c%s escape not available to "
1.195 djm 1126: "multiplexed sessions\r\n",
1.245 dtucker 1127: escape_char, b);
1.195 djm 1128: buffer_append(berr, string,
1129: strlen(string));
1130: continue;
1131: }
1.197 djm 1132: /* Suspend the program. Inform the user */
1.195 djm 1133: snprintf(string, sizeof string,
1134: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 1135: buffer_append(berr, string, strlen(string));
1.31 markus 1136:
1137: /* Restore terminal modes and suspend. */
1138: client_suspend_self(bin, bout, berr);
1139:
1140: /* We have been continued. */
1141: continue;
1142:
1.111 markus 1143: case 'B':
1144: if (compat20) {
1145: snprintf(string, sizeof string,
1146: "%cB\r\n", escape_char);
1147: buffer_append(berr, string,
1148: strlen(string));
1.254 djm 1149: channel_request_start(c->self,
1.111 markus 1150: "break", 0);
1151: packet_put_int(1000);
1152: packet_send();
1153: }
1154: continue;
1155:
1.54 markus 1156: case 'R':
1.59 markus 1157: if (compat20) {
1158: if (datafellows & SSH_BUG_NOREKEY)
1.197 djm 1159: logit("Server does not "
1160: "support re-keying");
1.59 markus 1161: else
1162: need_rekeying = 1;
1163: }
1.54 markus 1164: continue;
1165:
1.242 dtucker 1166: case 'V':
1167: /* FALLTHROUGH */
1168: case 'v':
1169: if (c && c->ctl_chan != -1)
1170: goto noescape;
1171: if (!log_is_on_stderr()) {
1172: snprintf(string, sizeof string,
1173: "%c%c [Logging to syslog]\r\n",
1174: escape_char, ch);
1175: buffer_append(berr, string,
1176: strlen(string));
1177: continue;
1178: }
1179: if (ch == 'V' && options.log_level >
1180: SYSLOG_LEVEL_QUIET)
1181: log_change_level(--options.log_level);
1182: if (ch == 'v' && options.log_level <
1183: SYSLOG_LEVEL_DEBUG3)
1184: log_change_level(++options.log_level);
1185: snprintf(string, sizeof string,
1186: "%c%c [LogLevel %s]\r\n", escape_char, ch,
1187: log_level_name(options.log_level));
1188: buffer_append(berr, string, strlen(string));
1189: continue;
1190:
1.31 markus 1191: case '&':
1.217 djm 1192: if (c && c->ctl_chan != -1)
1.195 djm 1193: goto noescape;
1.31 markus 1194: /*
1.197 djm 1195: * Detach the program (continue to serve
1196: * connections, but put in background and no
1197: * more new connections).
1.31 markus 1198: */
1199: /* Restore tty modes. */
1.233 djm 1200: leave_raw_mode(
1201: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1202:
1203: /* Stop listening for new connections. */
1.86 markus 1204: channel_stop_listening();
1.31 markus 1205:
1.86 markus 1206: snprintf(string, sizeof string,
1207: "%c& [backgrounded]\n", escape_char);
1208: buffer_append(berr, string, strlen(string));
1.31 markus 1209:
1210: /* Fork into background. */
1211: pid = fork();
1212: if (pid < 0) {
1213: error("fork: %.100s", strerror(errno));
1214: continue;
1215: }
1216: if (pid != 0) { /* This is the parent. */
1217: /* The parent just exits. */
1218: exit(0);
1219: }
1220: /* The child continues serving connections. */
1.86 markus 1221: if (compat20) {
1222: buffer_append(bin, "\004", 1);
1223: /* fake EOF on stdin */
1224: return -1;
1225: } else if (!stdin_eof) {
1226: /*
1.197 djm 1227: * Sending SSH_CMSG_EOF alone does not
1228: * always appear to be enough. So we
1229: * try to send an EOF character first.
1.86 markus 1230: */
1231: packet_start(SSH_CMSG_STDIN_DATA);
1232: packet_put_string("\004", 1);
1233: packet_send();
1234: /* Close stdin. */
1235: stdin_eof = 1;
1236: if (buffer_len(bin) == 0) {
1237: packet_start(SSH_CMSG_EOF);
1238: packet_send();
1239: }
1240: }
1241: continue;
1.31 markus 1242:
1243: case '?':
1.244 dtucker 1244: print_escape_help(berr, escape_char, compat20,
1245: (c && c->ctl_chan != -1),
1246: log_is_on_stderr());
1.31 markus 1247: continue;
1248:
1249: case '#':
1.195 djm 1250: snprintf(string, sizeof string, "%c#\r\n",
1251: escape_char);
1.32 markus 1252: buffer_append(berr, string, strlen(string));
1.31 markus 1253: s = channel_open_message();
1254: buffer_append(berr, s, strlen(s));
1.250 djm 1255: free(s);
1.97 jakob 1256: continue;
1257:
1258: case 'C':
1.217 djm 1259: if (c && c->ctl_chan != -1)
1.206 djm 1260: goto noescape;
1.99 markus 1261: process_cmdline();
1.31 markus 1262: continue;
1263:
1264: default:
1265: if (ch != escape_char) {
1266: buffer_put_char(bin, escape_char);
1267: bytes++;
1268: }
1269: /* Escaped characters fall through here */
1270: break;
1271: }
1272: } else {
1273: /*
1.197 djm 1274: * The previous character was not an escape char.
1275: * Check if this is an escape.
1.31 markus 1276: */
1277: if (last_was_cr && ch == escape_char) {
1.197 djm 1278: /*
1279: * It is. Set the flag and continue to
1280: * next character.
1281: */
1.195 djm 1282: *escape_pendingp = 1;
1.31 markus 1283: continue;
1284: }
1285: }
1286:
1287: /*
1288: * Normal character. Record whether it was a newline,
1289: * and append it to the buffer.
1290: */
1291: last_was_cr = (ch == '\r' || ch == '\n');
1292: buffer_put_char(bin, ch);
1293: bytes++;
1294: }
1295: return bytes;
1296: }
1297:
1.77 itojun 1298: static void
1.161 deraadt 1299: client_process_input(fd_set *readset)
1.17 markus 1300: {
1.21 deraadt 1301: int len;
1.31 markus 1302: char buf[8192];
1.16 markus 1303:
1.11 markus 1304: /* Read input from stdin. */
1305: if (FD_ISSET(fileno(stdin), readset)) {
1306: /* Read as much as possible. */
1307: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1308: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1309: return; /* we'll try again later */
1.11 markus 1310: if (len <= 0) {
1.13 markus 1311: /*
1312: * Received EOF or error. They are treated
1313: * similarly, except that an error message is printed
1314: * if it was an error condition.
1315: */
1.11 markus 1316: if (len < 0) {
1.197 djm 1317: snprintf(buf, sizeof buf, "read: %.100s\r\n",
1318: strerror(errno));
1.11 markus 1319: buffer_append(&stderr_buffer, buf, strlen(buf));
1320: }
1321: /* Mark that we have seen EOF. */
1322: stdin_eof = 1;
1.13 markus 1323: /*
1324: * Send an EOF message to the server unless there is
1325: * data in the buffer. If there is data in the
1326: * buffer, no message will be sent now. Code
1327: * elsewhere will send the EOF when the buffer
1328: * becomes empty if stdin_eof is set.
1329: */
1.11 markus 1330: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1331: packet_start(SSH_CMSG_EOF);
1332: packet_send();
1.11 markus 1333: }
1.195 djm 1334: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1335: /*
1336: * Normal successful read, and no escape character.
1337: * Just append the data to buffer.
1338: */
1.11 markus 1339: buffer_append(&stdin_buffer, buf, len);
1340: } else {
1.13 markus 1341: /*
1.197 djm 1342: * Normal, successful read. But we have an escape
1343: * character and have to process the characters one
1344: * by one.
1.13 markus 1345: */
1.195 djm 1346: if (process_escapes(NULL, &stdin_buffer,
1347: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1348: return;
1.11 markus 1349: }
1350: }
1351: }
1352:
1.77 itojun 1353: static void
1.161 deraadt 1354: client_process_output(fd_set *writeset)
1.11 markus 1355: {
1356: int len;
1357: char buf[100];
1.1 deraadt 1358:
1.11 markus 1359: /* Write buffered output to stdout. */
1360: if (FD_ISSET(fileno(stdout), writeset)) {
1361: /* Write as much data as possible. */
1362: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1363: buffer_len(&stdout_buffer));
1.11 markus 1364: if (len <= 0) {
1.64 markus 1365: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1366: len = 0;
1367: else {
1.13 markus 1368: /*
1369: * An error or EOF was encountered. Put an
1370: * error message to stderr buffer.
1371: */
1.197 djm 1372: snprintf(buf, sizeof buf,
1373: "write stdout: %.50s\r\n", strerror(errno));
1.11 markus 1374: buffer_append(&stderr_buffer, buf, strlen(buf));
1375: quit_pending = 1;
1376: return;
1377: }
1378: }
1379: /* Consume printed data from the buffer. */
1380: buffer_consume(&stdout_buffer, len);
1381: }
1382: /* Write buffered output to stderr. */
1383: if (FD_ISSET(fileno(stderr), writeset)) {
1384: /* Write as much data as possible. */
1385: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1386: buffer_len(&stderr_buffer));
1.11 markus 1387: if (len <= 0) {
1.64 markus 1388: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1389: len = 0;
1390: else {
1.197 djm 1391: /*
1392: * EOF or error, but can't even print
1393: * error message.
1394: */
1.11 markus 1395: quit_pending = 1;
1396: return;
1397: }
1398: }
1399: /* Consume printed characters from the buffer. */
1400: buffer_consume(&stderr_buffer, len);
1401: }
1.1 deraadt 1402: }
1403:
1.13 markus 1404: /*
1.15 markus 1405: * Get packets from the connection input buffer, and process them as long as
1406: * there are packets available.
1407: *
1408: * Any unknown packets received during the actual
1409: * session cause the session to terminate. This is
1410: * intended to make debugging easier since no
1411: * confirmations are sent. Any compatible protocol
1412: * extensions must be negotiated during the
1413: * preparatory phase.
1414: */
1415:
1.77 itojun 1416: static void
1.49 itojun 1417: client_process_buffered_input_packets(void)
1.15 markus 1418: {
1.265 markus 1419: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, active_state);
1.15 markus 1420: }
1421:
1.31 markus 1422: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1423:
1.195 djm 1424: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1425: void *
1426: client_new_escape_filter_ctx(int escape_char)
1427: {
1428: struct escape_filter_ctx *ret;
1429:
1.255 djm 1430: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1431: ret->escape_pending = 0;
1432: ret->escape_char = escape_char;
1433: return (void *)ret;
1434: }
1435:
1.198 djm 1436: /* Free the escape filter context on channel free */
1437: void
1438: client_filter_cleanup(int cid, void *ctx)
1439: {
1.250 djm 1440: free(ctx);
1.198 djm 1441: }
1442:
1.195 djm 1443: int
1444: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1445: {
1.190 djm 1446: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1447: return 0;
1448:
1.195 djm 1449: return process_escapes(c, &c->input, &c->output, &c->extended,
1450: buf, len);
1.30 markus 1451: }
1452:
1.77 itojun 1453: static void
1.60 markus 1454: client_channel_closed(int id, void *arg)
1455: {
1.83 markus 1456: channel_cancel_cleanup(id);
1.60 markus 1457: session_closed = 1;
1.233 djm 1458: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1459: }
1460:
1.15 markus 1461: /*
1.13 markus 1462: * Implements the interactive session with the server. This is called after
1463: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1464: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1465: * used as an escape character for terminating or suspending the session.
1.13 markus 1466: */
1.1 deraadt 1467:
1.20 markus 1468: int
1.30 markus 1469: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1470: {
1.46 markus 1471: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1472: double start_time, total_time;
1.265 markus 1473: int r, max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1.200 markus 1474: u_int64_t ibytes, obytes;
1.130 avsm 1475: u_int nalloc = 0;
1.11 markus 1476: char buf[100];
1477:
1478: debug("Entering interactive session.");
1479:
1480: start_time = get_current_time();
1481:
1482: /* Initialize variables. */
1.195 djm 1483: escape_pending1 = 0;
1.11 markus 1484: last_was_cr = 1;
1485: exit_status = -1;
1486: stdin_eof = 0;
1487: buffer_high = 64 * 1024;
1488: connection_in = packet_get_connection_in();
1489: connection_out = packet_get_connection_out();
1.46 markus 1490: max_fd = MAX(connection_in, connection_out);
1491:
1492: if (!compat20) {
1.63 markus 1493: /* enable nonblocking unless tty */
1494: if (!isatty(fileno(stdin)))
1495: set_nonblock(fileno(stdin));
1496: if (!isatty(fileno(stdout)))
1497: set_nonblock(fileno(stdout));
1498: if (!isatty(fileno(stderr)))
1499: set_nonblock(fileno(stderr));
1.46 markus 1500: max_fd = MAX(max_fd, fileno(stdin));
1501: max_fd = MAX(max_fd, fileno(stdout));
1502: max_fd = MAX(max_fd, fileno(stderr));
1503: }
1.11 markus 1504: quit_pending = 0;
1.195 djm 1505: escape_char1 = escape_char_arg;
1.11 markus 1506:
1507: /* Initialize buffers. */
1508: buffer_init(&stdin_buffer);
1509: buffer_init(&stdout_buffer);
1510: buffer_init(&stderr_buffer);
1511:
1.15 markus 1512: client_init_dispatch();
1513:
1.105 markus 1514: /*
1515: * Set signal handlers, (e.g. to restore non-blocking mode)
1516: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1517: */
1.131 djm 1518: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1519: signal(SIGHUP, signal_handler);
1.105 markus 1520: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1521: signal(SIGINT, signal_handler);
1522: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1523: signal(SIGQUIT, signal_handler);
1524: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1525: signal(SIGTERM, signal_handler);
1.132 djm 1526: signal(SIGWINCH, window_change_handler);
1.11 markus 1527:
1528: if (have_pty)
1.233 djm 1529: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1530:
1.48 markus 1531: if (compat20) {
1532: session_ident = ssh2_chan_id;
1.232 djm 1533: if (session_ident != -1) {
1534: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1535: channel_register_filter(session_ident,
1536: client_simple_escape_filter, NULL,
1537: client_filter_cleanup,
1538: client_new_escape_filter_ctx(
1539: escape_char_arg));
1540: }
1.60 markus 1541: channel_register_cleanup(session_ident,
1.143 djm 1542: client_channel_closed, 0);
1.232 djm 1543: }
1.48 markus 1544: } else {
1545: /* Check if we should immediately send eof on stdin. */
1.16 markus 1546: client_check_initial_eof_on_stdin();
1.48 markus 1547: }
1.30 markus 1548:
1.11 markus 1549: /* Main loop of the client for the interactive session mode. */
1550: while (!quit_pending) {
1551:
1.13 markus 1552: /* Process buffered packets sent by the server. */
1.11 markus 1553: client_process_buffered_input_packets();
1554:
1.60 markus 1555: if (compat20 && session_closed && !channel_still_open())
1556: break;
1557:
1.263 markus 1558: rekeying = (active_state->kex != NULL && !active_state->kex->done);
1.16 markus 1559:
1.56 markus 1560: if (rekeying) {
1561: debug("rekeying in progress");
1562: } else {
1563: /*
1564: * Make packets of buffered stdin data, and buffer
1565: * them for sending to the server.
1566: */
1567: if (!compat20)
1568: client_make_packets_from_stdin_data();
1.11 markus 1569:
1.56 markus 1570: /*
1571: * Make packets from buffered channel data, and
1572: * enqueue them for sending to the server.
1573: */
1574: if (packet_not_very_much_data_to_write())
1575: channel_output_poll();
1.11 markus 1576:
1.56 markus 1577: /*
1578: * Check if the window size has changed, and buffer a
1579: * message about it to the server if so.
1580: */
1581: client_check_window_change();
1.11 markus 1582:
1.56 markus 1583: if (quit_pending)
1584: break;
1585: }
1.13 markus 1586: /*
1587: * Wait until we have something to do (something becomes
1588: * available on one of the descriptors).
1589: */
1.81 markus 1590: max_fd2 = max_fd;
1.56 markus 1591: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1592: &max_fd2, &nalloc, rekeying);
1.11 markus 1593:
1594: if (quit_pending)
1595: break;
1596:
1.56 markus 1597: /* Do channel operations unless rekeying in progress. */
1598: if (!rekeying) {
1599: channel_after_select(readset, writeset);
1.108 markus 1600: if (need_rekeying || packet_need_rekeying()) {
1601: debug("need rekeying");
1.263 markus 1602: active_state->kex->done = 0;
1.265 markus 1603: if ((r = kex_send_kexinit(active_state)) != 0)
1604: fatal("%s: kex_send_kexinit: %s",
1605: __func__, ssh_err(r));
1.56 markus 1606: need_rekeying = 0;
1607: }
1608: }
1.11 markus 1609:
1.17 markus 1610: /* Buffer input from the connection. */
1.46 markus 1611: client_process_net_input(readset);
1.17 markus 1612:
1613: if (quit_pending)
1614: break;
1.11 markus 1615:
1.17 markus 1616: if (!compat20) {
1617: /* Buffer data from stdin */
1.46 markus 1618: client_process_input(readset);
1.17 markus 1619: /*
1620: * Process output to stdout and stderr. Output to
1621: * the connection is processed elsewhere (above).
1622: */
1.46 markus 1623: client_process_output(writeset);
1.214 andreas 1624: }
1625:
1626: if (session_resumed) {
1627: connection_in = packet_get_connection_in();
1628: connection_out = packet_get_connection_out();
1629: max_fd = MAX(max_fd, connection_out);
1630: max_fd = MAX(max_fd, connection_in);
1631: session_resumed = 0;
1.17 markus 1632: }
1.11 markus 1633:
1.197 djm 1634: /*
1635: * Send as much buffered packet data as possible to the
1636: * sender.
1637: */
1.46 markus 1638: if (FD_ISSET(connection_out, writeset))
1.11 markus 1639: packet_write_poll();
1.222 djm 1640:
1641: /*
1642: * If we are a backgrounded control master, and the
1643: * timeout has expired without any active client
1644: * connections, then quit.
1645: */
1646: if (control_persist_exit_time > 0) {
1.251 dtucker 1647: if (monotime() >= control_persist_exit_time) {
1.222 djm 1648: debug("ControlPersist timeout expired");
1649: break;
1650: }
1651: }
1.11 markus 1652: }
1.250 djm 1653: free(readset);
1654: free(writeset);
1.11 markus 1655:
1656: /* Terminate the session. */
1657:
1658: /* Stop watching for window change. */
1.132 djm 1659: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1660:
1.213 stevesk 1661: if (compat20) {
1662: packet_start(SSH2_MSG_DISCONNECT);
1663: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1664: packet_put_cstring("disconnected by user");
1.219 djm 1665: packet_put_cstring(""); /* language tag */
1.213 stevesk 1666: packet_send();
1667: packet_write_wait();
1668: }
1.11 markus 1669:
1.76 markus 1670: channel_free_all();
1.11 markus 1671:
1.75 markus 1672: if (have_pty)
1.233 djm 1673: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1674:
1675: /* restore blocking io */
1676: if (!isatty(fileno(stdin)))
1677: unset_nonblock(fileno(stdin));
1678: if (!isatty(fileno(stdout)))
1679: unset_nonblock(fileno(stdout));
1680: if (!isatty(fileno(stderr)))
1681: unset_nonblock(fileno(stderr));
1.116 dtucker 1682:
1683: /*
1684: * If there was no shell or command requested, there will be no remote
1685: * exit status to be returned. In that case, clear error code if the
1686: * connection was deliberately terminated at this end.
1687: */
1688: if (no_shell_flag && received_signal == SIGTERM) {
1689: received_signal = 0;
1690: exit_status = 0;
1691: }
1.75 markus 1692:
1.113 markus 1693: if (received_signal)
1.89 itojun 1694: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1695:
1.13 markus 1696: /*
1697: * In interactive mode (with pseudo tty) display a message indicating
1698: * that the connection has been closed.
1699: */
1.11 markus 1700: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1701: snprintf(buf, sizeof buf,
1702: "Connection to %.64s closed.\r\n", host);
1.11 markus 1703: buffer_append(&stderr_buffer, buf, strlen(buf));
1704: }
1.70 markus 1705:
1.11 markus 1706: /* Output any buffered data for stdout. */
1.231 djm 1707: if (buffer_len(&stdout_buffer) > 0) {
1.230 djm 1708: len = atomicio(vwrite, fileno(stdout),
1709: buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer));
1.231 djm 1710: if (len < 0 || (u_int)len != buffer_len(&stdout_buffer))
1.11 markus 1711: error("Write failed flushing stdout buffer.");
1.231 djm 1712: else
1713: buffer_consume(&stdout_buffer, len);
1.11 markus 1714: }
1715:
1716: /* Output any buffered data for stderr. */
1.231 djm 1717: if (buffer_len(&stderr_buffer) > 0) {
1.230 djm 1718: len = atomicio(vwrite, fileno(stderr),
1719: buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1.231 djm 1720: if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1.11 markus 1721: error("Write failed flushing stderr buffer.");
1.231 djm 1722: else
1723: buffer_consume(&stderr_buffer, len);
1.11 markus 1724: }
1725:
1726: /* Clear and free any buffers. */
1727: memset(buf, 0, sizeof(buf));
1728: buffer_free(&stdin_buffer);
1729: buffer_free(&stdout_buffer);
1730: buffer_free(&stderr_buffer);
1731:
1732: /* Report bytes transferred, and transfer rates. */
1733: total_time = get_current_time() - start_time;
1.263 markus 1734: packet_get_bytes(&ibytes, &obytes);
1.200 markus 1735: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1736: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1737: if (total_time > 0)
1.200 markus 1738: verbose("Bytes per second: sent %.1f, received %.1f",
1739: obytes / total_time, ibytes / total_time);
1.11 markus 1740: /* Return the exit status of the program. */
1741: debug("Exit status %d", exit_status);
1742: return exit_status;
1.15 markus 1743: }
1744:
1745: /*********/
1746:
1.264 markus 1747: static int
1.94 markus 1748: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1749: {
1.42 markus 1750: u_int data_len;
1.15 markus 1751: char *data = packet_get_string(&data_len);
1.93 markus 1752: packet_check_eom();
1.15 markus 1753: buffer_append(&stdout_buffer, data, data_len);
1.258 djm 1754: explicit_bzero(data, data_len);
1.250 djm 1755: free(data);
1.264 markus 1756: return 0;
1.15 markus 1757: }
1.264 markus 1758: static int
1.94 markus 1759: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1760: {
1.42 markus 1761: u_int data_len;
1.15 markus 1762: char *data = packet_get_string(&data_len);
1.93 markus 1763: packet_check_eom();
1.15 markus 1764: buffer_append(&stderr_buffer, data, data_len);
1.258 djm 1765: explicit_bzero(data, data_len);
1.250 djm 1766: free(data);
1.264 markus 1767: return 0;
1.15 markus 1768: }
1.264 markus 1769: static int
1.94 markus 1770: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1771: {
1772: exit_status = packet_get_int();
1.93 markus 1773: packet_check_eom();
1.15 markus 1774: /* Acknowledge the exit. */
1775: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1776: packet_send();
1777: /*
1778: * Must wait for packet to be sent since we are
1779: * exiting the loop.
1780: */
1781: packet_write_wait();
1782: /* Flag that we want to exit. */
1783: quit_pending = 1;
1.264 markus 1784: return 0;
1.15 markus 1785: }
1.267 djm 1786:
1.264 markus 1787: static int
1.115 markus 1788: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1789: {
1790: Channel *c = NULL;
1.262 djm 1791: int r, remote_id, sock;
1.115 markus 1792:
1793: /* Read the remote channel number from the message. */
1794: remote_id = packet_get_int();
1795: packet_check_eom();
1796:
1797: /*
1798: * Get a connection to the local authentication agent (this may again
1799: * get forwarded).
1800: */
1.262 djm 1801: if ((r = ssh_get_authentication_socket(&sock)) != 0 &&
1802: r != SSH_ERR_AGENT_NOT_PRESENT)
1803: debug("%s: ssh_get_authentication_socket: %s",
1804: __func__, ssh_err(r));
1805:
1.115 markus 1806:
1807: /*
1808: * If we could not connect the agent, send an error message back to
1809: * the server. This should never happen unless the agent dies,
1810: * because authentication forwarding is only enabled if we have an
1811: * agent.
1812: */
1813: if (sock >= 0) {
1814: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1815: -1, 0, 0, 0, "authentication agent connection", 1);
1816: c->remote_id = remote_id;
1817: c->force_drain = 1;
1818: }
1819: if (c == NULL) {
1820: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1821: packet_put_int(remote_id);
1822: } else {
1823: /* Send a confirmation to the remote host. */
1824: debug("Forwarding authentication connection.");
1825: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1826: packet_put_int(remote_id);
1827: packet_put_int(c->self);
1828: }
1829: packet_send();
1.264 markus 1830: return 0;
1.115 markus 1831: }
1.15 markus 1832:
1.77 itojun 1833: static Channel *
1.40 markus 1834: client_request_forwarded_tcpip(const char *request_type, int rchan)
1835: {
1.103 deraadt 1836: Channel *c = NULL;
1.40 markus 1837: char *listen_address, *originator_address;
1.208 djm 1838: u_short listen_port, originator_port;
1.40 markus 1839:
1840: /* Get rest of the packet */
1841: listen_address = packet_get_string(NULL);
1842: listen_port = packet_get_int();
1843: originator_address = packet_get_string(NULL);
1844: originator_port = packet_get_int();
1.93 markus 1845: packet_check_eom();
1.40 markus 1846:
1.261 millert 1847: debug("%s: listen %s port %d, originator %s port %d", __func__,
1848: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1849:
1.260 markus 1850: c = channel_connect_by_listen_address(listen_address, listen_port,
1.191 djm 1851: "forwarded-tcpip", originator_address);
1.40 markus 1852:
1.250 djm 1853: free(originator_address);
1854: free(listen_address);
1.40 markus 1855: return c;
1856: }
1857:
1.103 deraadt 1858: static Channel *
1.261 millert 1859: client_request_forwarded_streamlocal(const char *request_type, int rchan)
1860: {
1861: Channel *c = NULL;
1862: char *listen_path;
1863:
1864: /* Get the remote path. */
1865: listen_path = packet_get_string(NULL);
1866: /* XXX: Skip reserved field for now. */
1867: if (packet_get_string_ptr(NULL) == NULL)
1868: fatal("%s: packet_get_string_ptr failed", __func__);
1869: packet_check_eom();
1870:
1871: debug("%s: %s", __func__, listen_path);
1872:
1873: c = channel_connect_by_listen_path(listen_path,
1874: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1875: free(listen_path);
1876: return c;
1877: }
1878:
1879: static Channel *
1.40 markus 1880: client_request_x11(const char *request_type, int rchan)
1881: {
1882: Channel *c = NULL;
1883: char *originator;
1.208 djm 1884: u_short originator_port;
1.67 markus 1885: int sock;
1.40 markus 1886:
1887: if (!options.forward_x11) {
1888: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1889: error("Warning: this is probably a break-in attempt by a "
1890: "malicious server.");
1.221 djm 1891: return NULL;
1892: }
1.274 ! djm 1893: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1894: verbose("Rejected X11 connection after ForwardX11Timeout "
1895: "expired");
1.40 markus 1896: return NULL;
1897: }
1898: originator = packet_get_string(NULL);
1899: if (datafellows & SSH_BUG_X11FWD) {
1900: debug2("buggy server: x11 request w/o originator_port");
1901: originator_port = 0;
1902: } else {
1903: originator_port = packet_get_int();
1904: }
1.93 markus 1905: packet_check_eom();
1.40 markus 1906: /* XXX check permission */
1.47 markus 1907: debug("client_request_x11: request from %s %d", originator,
1908: originator_port);
1.250 djm 1909: free(originator);
1.40 markus 1910: sock = x11_connect_display();
1.67 markus 1911: if (sock < 0)
1912: return NULL;
1913: c = channel_new("x11",
1914: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1915: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1916: c->force_drain = 1;
1.40 markus 1917: return c;
1918: }
1919:
1.103 deraadt 1920: static Channel *
1.40 markus 1921: client_request_agent(const char *request_type, int rchan)
1922: {
1923: Channel *c = NULL;
1.262 djm 1924: int r, sock;
1.40 markus 1925:
1926: if (!options.forward_agent) {
1927: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1928: error("Warning: this is probably a break-in attempt by a "
1929: "malicious server.");
1.40 markus 1930: return NULL;
1931: }
1.262 djm 1932: if ((r = ssh_get_authentication_socket(&sock)) != 0) {
1933: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1934: debug("%s: ssh_get_authentication_socket: %s",
1935: __func__, ssh_err(r));
1.67 markus 1936: return NULL;
1.262 djm 1937: }
1.67 markus 1938: c = channel_new("authentication agent connection",
1939: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1940: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1941: "authentication agent connection", 1);
1.82 markus 1942: c->force_drain = 1;
1.40 markus 1943: return c;
1.180 djm 1944: }
1945:
1946: int
1947: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1948: {
1949: Channel *c;
1950: int fd;
1951:
1952: if (tun_mode == SSH_TUNMODE_NO)
1953: return 0;
1954:
1955: if (!compat20) {
1.207 stevesk 1956: error("Tunnel forwarding is not supported for protocol 1");
1.180 djm 1957: return -1;
1958: }
1959:
1960: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1961:
1962: /* Open local tunnel device */
1963: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1964: error("Tunnel device open failed.");
1965: return -1;
1966: }
1967:
1968: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1969: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1970: c->datagram = 1;
1971:
1972: packet_start(SSH2_MSG_CHANNEL_OPEN);
1973: packet_put_cstring("tun@openssh.com");
1974: packet_put_int(c->self);
1975: packet_put_int(c->local_window_max);
1976: packet_put_int(c->local_maxpacket);
1977: packet_put_int(tun_mode);
1978: packet_put_int(remote_tun);
1979: packet_send();
1980:
1981: return 0;
1.40 markus 1982: }
1983:
1.22 markus 1984: /* XXXX move to generic input handler */
1.264 markus 1985: static int
1.94 markus 1986: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1987: {
1988: Channel *c = NULL;
1989: char *ctype;
1990: int rchan;
1.102 markus 1991: u_int rmaxpack, rwindow, len;
1.22 markus 1992:
1993: ctype = packet_get_string(&len);
1994: rchan = packet_get_int();
1995: rwindow = packet_get_int();
1996: rmaxpack = packet_get_int();
1997:
1.24 markus 1998: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1999: ctype, rchan, rwindow, rmaxpack);
2000:
1.40 markus 2001: if (strcmp(ctype, "forwarded-tcpip") == 0) {
2002: c = client_request_forwarded_tcpip(ctype, rchan);
1.261 millert 2003: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
2004: c = client_request_forwarded_streamlocal(ctype, rchan);
1.40 markus 2005: } else if (strcmp(ctype, "x11") == 0) {
2006: c = client_request_x11(ctype, rchan);
2007: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
2008: c = client_request_agent(ctype, rchan);
1.22 markus 2009: }
2010: /* XXX duplicate : */
2011: if (c != NULL) {
2012: debug("confirm %s", ctype);
2013: c->remote_id = rchan;
2014: c->remote_window = rwindow;
2015: c->remote_maxpacket = rmaxpack;
1.69 markus 2016: if (c->type != SSH_CHANNEL_CONNECTING) {
2017: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
2018: packet_put_int(c->remote_id);
2019: packet_put_int(c->self);
2020: packet_put_int(c->local_window);
2021: packet_put_int(c->local_maxpacket);
2022: packet_send();
2023: }
1.22 markus 2024: } else {
2025: debug("failure %s", ctype);
2026: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
2027: packet_put_int(rchan);
2028: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 2029: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 2030: packet_put_cstring("open failed");
1.66 markus 2031: packet_put_cstring("");
2032: }
1.22 markus 2033: packet_send();
2034: }
1.250 djm 2035: free(ctype);
1.264 markus 2036: return 0;
1.22 markus 2037: }
1.267 djm 2038:
1.264 markus 2039: static int
1.94 markus 2040: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 2041: {
2042: Channel *c = NULL;
1.123 djm 2043: int exitval, id, reply, success = 0;
1.48 markus 2044: char *rtype;
2045:
2046: id = packet_get_int();
2047: rtype = packet_get_string(NULL);
2048: reply = packet_get_char();
2049:
2050: debug("client_input_channel_req: channel %d rtype %s reply %d",
2051: id, rtype, reply);
2052:
1.128 djm 2053: if (id == -1) {
2054: error("client_input_channel_req: request for channel -1");
2055: } else if ((c = channel_lookup(id)) == NULL) {
1.197 djm 2056: error("client_input_channel_req: channel %d: "
2057: "unknown channel", id);
1.193 markus 2058: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
2059: packet_check_eom();
2060: chan_rcvd_eow(c);
1.48 markus 2061: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 2062: exitval = packet_get_int();
1.217 djm 2063: if (c->ctl_chan != -1) {
2064: mux_exit_message(c, exitval);
1.215 djm 2065: success = 1;
2066: } else if (id == session_ident) {
2067: /* Record exit value of local session */
1.123 djm 2068: success = 1;
2069: exit_status = exitval;
1.215 djm 2070: } else {
1.218 djm 2071: /* Probably for a mux channel that has already closed */
2072: debug("%s: no sink for exit-status on channel %d",
2073: __func__, id);
1.123 djm 2074: }
1.93 markus 2075: packet_check_eom();
1.48 markus 2076: }
1.259 djm 2077: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.48 markus 2078: packet_start(success ?
2079: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 2080: packet_put_int(c->remote_id);
1.48 markus 2081: packet_send();
2082: }
1.250 djm 2083: free(rtype);
1.264 markus 2084: return 0;
1.48 markus 2085: }
1.267 djm 2086:
1.269 djm 2087: struct hostkeys_update_ctx {
2088: /* The hostname and (optionally) IP address string for the server */
2089: char *host_str, *ip_str;
2090:
2091: /*
2092: * Keys received from the server and a flag for each indicating
2093: * whether they already exist in known_hosts.
2094: * keys_seen is filled in by hostkeys_find() and later (for new
2095: * keys) by client_global_hostkeys_private_confirm().
2096: */
2097: struct sshkey **keys;
2098: int *keys_seen;
2099: size_t nkeys;
2100:
2101: size_t nnew;
2102:
2103: /*
2104: * Keys that are in known_hosts, but were not present in the update
2105: * from the server (i.e. scheduled to be deleted).
2106: * Filled in by hostkeys_find().
2107: */
2108: struct sshkey **old_keys;
2109: size_t nold;
2110: };
2111:
2112: static void
2113: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
2114: {
2115: size_t i;
2116:
2117: if (ctx == NULL)
2118: return;
2119: for (i = 0; i < ctx->nkeys; i++)
2120: sshkey_free(ctx->keys[i]);
2121: free(ctx->keys);
2122: free(ctx->keys_seen);
2123: for (i = 0; i < ctx->nold; i++)
2124: sshkey_free(ctx->old_keys[i]);
2125: free(ctx->old_keys);
2126: free(ctx->host_str);
2127: free(ctx->ip_str);
2128: free(ctx);
2129: }
2130:
2131: static int
2132: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
2133: {
2134: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2135: size_t i;
2136: struct sshkey **tmp;
2137:
2138: if (l->status != HKF_STATUS_MATCHED || l->key == NULL ||
2139: l->key->type == KEY_RSA1)
2140: return 0;
2141:
2142: /* Mark off keys we've already seen for this host */
2143: for (i = 0; i < ctx->nkeys; i++) {
2144: if (sshkey_equal(l->key, ctx->keys[i])) {
2145: debug3("%s: found %s key at %s:%ld", __func__,
2146: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
2147: ctx->keys_seen[i] = 1;
2148: return 0;
2149: }
2150: }
2151: /* This line contained a key that not offered by the server */
2152: debug3("%s: deprecated %s key at %s:%ld", __func__,
2153: sshkey_ssh_name(l->key), l->path, l->linenum);
2154: if ((tmp = reallocarray(ctx->old_keys, ctx->nold + 1,
2155: sizeof(*ctx->old_keys))) == NULL)
2156: fatal("%s: reallocarray failed nold = %zu",
2157: __func__, ctx->nold);
2158: ctx->old_keys = tmp;
2159: ctx->old_keys[ctx->nold++] = l->key;
2160: l->key = NULL;
2161:
2162: return 0;
2163: }
2164:
2165: static void
2166: update_known_hosts(struct hostkeys_update_ctx *ctx)
2167: {
1.271 djm 2168: int r, was_raw = 0;
2169: int loglevel = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK ?
1.269 djm 2170: SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
2171: char *fp, *response;
2172: size_t i;
2173:
2174: for (i = 0; i < ctx->nkeys; i++) {
2175: if (ctx->keys_seen[i] != 2)
2176: continue;
2177: if ((fp = sshkey_fingerprint(ctx->keys[i],
2178: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2179: fatal("%s: sshkey_fingerprint failed", __func__);
2180: do_log2(loglevel, "Learned new hostkey: %s %s",
2181: sshkey_type(ctx->keys[i]), fp);
2182: free(fp);
2183: }
2184: for (i = 0; i < ctx->nold; i++) {
2185: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2186: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2187: fatal("%s: sshkey_fingerprint failed", __func__);
2188: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2189: sshkey_type(ctx->old_keys[i]), fp);
2190: free(fp);
2191: }
2192: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2193: if (get_saved_tio() != NULL) {
2194: leave_raw_mode(1);
2195: was_raw = 1;
2196: }
1.269 djm 2197: response = NULL;
2198: for (i = 0; !quit_pending && i < 3; i++) {
2199: free(response);
2200: response = read_passphrase("Accept updated hostkeys? "
2201: "(yes/no): ", RP_ECHO);
2202: if (strcasecmp(response, "yes") == 0)
2203: break;
2204: else if (quit_pending || response == NULL ||
2205: strcasecmp(response, "no") == 0) {
2206: options.update_hostkeys = 0;
2207: break;
2208: } else {
2209: do_log2(loglevel, "Please enter "
2210: "\"yes\" or \"no\"");
2211: }
2212: }
2213: if (quit_pending || i >= 3 || response == NULL)
2214: options.update_hostkeys = 0;
2215: free(response);
1.271 djm 2216: if (was_raw)
2217: enter_raw_mode(1);
1.269 djm 2218: }
2219:
2220: /*
2221: * Now that all the keys are verified, we can go ahead and replace
2222: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2223: * cancel the operation).
2224: */
2225: if (options.update_hostkeys != 0 &&
2226: (r = hostfile_replace_entries(options.user_hostfiles[0],
2227: ctx->host_str, ctx->ip_str, ctx->keys, ctx->nkeys,
2228: options.hash_known_hosts, 0,
2229: options.fingerprint_hash)) != 0)
2230: error("%s: hostfile_replace_entries failed: %s",
2231: __func__, ssh_err(r));
2232: }
2233:
2234: static void
2235: client_global_hostkeys_private_confirm(int type, u_int32_t seq, void *_ctx)
2236: {
2237: struct ssh *ssh = active_state; /* XXX */
2238: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2239: size_t i, ndone;
2240: struct sshbuf *signdata;
2241: int r;
2242: const u_char *sig;
2243: size_t siglen;
2244:
2245: if (ctx->nnew == 0)
2246: fatal("%s: ctx->nnew == 0", __func__); /* sanity */
2247: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2248: error("Server failed to confirm ownership of "
2249: "private host keys");
2250: hostkeys_update_ctx_free(ctx);
2251: return;
2252: }
2253: if ((signdata = sshbuf_new()) == NULL)
2254: fatal("%s: sshbuf_new failed", __func__);
2255: /* Don't want to accidentally accept an unbound signature */
2256: if (ssh->kex->session_id_len == 0)
2257: fatal("%s: ssh->kex->session_id_len == 0", __func__);
2258: /*
2259: * Expect a signature for each of the ctx->nnew private keys we
2260: * haven't seen before. They will be in the same order as the
2261: * ctx->keys where the corresponding ctx->keys_seen[i] == 0.
2262: */
2263: for (ndone = i = 0; i < ctx->nkeys; i++) {
2264: if (ctx->keys_seen[i])
2265: continue;
2266: /* Prepare data to be signed: session ID, unique string, key */
2267: sshbuf_reset(signdata);
1.270 djm 2268: if ( (r = sshbuf_put_cstring(signdata,
2269: "hostkeys-prove-00@openssh.com")) != 0 ||
2270: (r = sshbuf_put_string(signdata, ssh->kex->session_id,
1.269 djm 2271: ssh->kex->session_id_len)) != 0 ||
2272: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
2273: fatal("%s: failed to prepare signature: %s",
2274: __func__, ssh_err(r));
2275: /* Extract and verify signature */
2276: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
2277: error("%s: couldn't parse message: %s",
2278: __func__, ssh_err(r));
2279: goto out;
2280: }
2281: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
2282: sshbuf_ptr(signdata), sshbuf_len(signdata), 0)) != 0) {
2283: error("%s: server gave bad signature for %s key %zu",
2284: __func__, sshkey_type(ctx->keys[i]), i);
2285: goto out;
2286: }
2287: /* Key is good. Mark it as 'seen' */
2288: ctx->keys_seen[i] = 2;
2289: ndone++;
2290: }
2291: if (ndone != ctx->nnew)
2292: fatal("%s: ndone != ctx->nnew (%zu / %zu)", __func__,
2293: ndone, ctx->nnew); /* Shouldn't happen */
2294: ssh_packet_check_eom(ssh);
2295:
2296: /* Make the edits to known_hosts */
2297: update_known_hosts(ctx);
2298: out:
2299: hostkeys_update_ctx_free(ctx);
2300: }
2301:
1.267 djm 2302: /*
1.270 djm 2303: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2304: * the server's hostkeys. The keys are checked against the user's
2305: * HostkeyAlgorithms preference before they are accepted.
2306: */
2307: static int
2308: client_input_hostkeys(void)
2309: {
1.269 djm 2310: struct ssh *ssh = active_state; /* XXX */
1.267 djm 2311: const u_char *blob = NULL;
1.269 djm 2312: size_t i, len = 0;
1.267 djm 2313: struct sshbuf *buf = NULL;
1.269 djm 2314: struct sshkey *key = NULL, **tmp;
2315: int r;
2316: char *fp;
1.267 djm 2317: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2318: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2319: struct hostkeys_update_ctx *ctx = NULL;
1.267 djm 2320:
2321: if (hostkeys_seen)
2322: fatal("%s: server already sent hostkeys", __func__);
1.269 djm 2323: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2324: options.batch_mode)
2325: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2326: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2327: return 1;
1.272 djm 2328:
2329: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2330: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2331: sshkey_free(key);
2332: key = NULL;
1.269 djm 2333: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
2334: error("%s: couldn't parse message: %s",
2335: __func__, ssh_err(r));
2336: goto out;
2337: }
1.270 djm 2338: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
2339: error("%s: parse key: %s", __func__, ssh_err(r));
2340: goto out;
2341: }
1.267 djm 2342: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2343: SSH_FP_DEFAULT);
2344: debug3("%s: received %s key %s", __func__,
2345: sshkey_type(key), fp);
2346: free(fp);
2347: /* Check that the key is accepted in HostkeyAlgorithms */
2348: if (options.hostkeyalgorithms != NULL &&
2349: match_pattern_list(sshkey_ssh_name(key),
1.273 djm 2350: options.hostkeyalgorithms, 0) != 1) {
1.267 djm 2351: debug3("%s: %s key not permitted by HostkeyAlgorithms",
2352: __func__, sshkey_ssh_name(key));
2353: continue;
2354: }
1.269 djm 2355: /* Skip certs */
2356: if (sshkey_is_cert(key)) {
2357: debug3("%s: %s key is a certificate; skipping",
2358: __func__, sshkey_ssh_name(key));
2359: continue;
2360: }
2361: /* Ensure keys are unique */
2362: for (i = 0; i < ctx->nkeys; i++) {
2363: if (sshkey_equal(key, ctx->keys[i])) {
2364: error("%s: received duplicated %s host key",
2365: __func__, sshkey_ssh_name(key));
2366: goto out;
2367: }
2368: }
2369: /* Key is good, record it */
2370: if ((tmp = reallocarray(ctx->keys, ctx->nkeys + 1,
2371: sizeof(*ctx->keys))) == NULL)
2372: fatal("%s: reallocarray failed nkeys = %zu",
2373: __func__, ctx->nkeys);
2374: ctx->keys = tmp;
2375: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2376: key = NULL;
2377: }
2378:
1.269 djm 2379: if (ctx->nkeys == 0) {
1.270 djm 2380: debug("%s: server sent no hostkeys", __func__);
1.267 djm 2381: goto out;
2382: }
1.270 djm 2383:
1.269 djm 2384: if ((ctx->keys_seen = calloc(ctx->nkeys,
2385: sizeof(*ctx->keys_seen))) == NULL)
2386: fatal("%s: calloc failed", __func__);
1.267 djm 2387:
1.268 djm 2388: get_hostfile_hostname_ipaddr(host,
2389: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2390: options.port, &ctx->host_str,
2391: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2392:
1.269 djm 2393: /* Find which keys we already know about. */
2394: if ((r = hostkeys_foreach(options.user_hostfiles[0], hostkeys_find,
2395: ctx, ctx->host_str, ctx->ip_str,
2396: HKF_WANT_PARSE_KEY|HKF_WANT_MATCH)) != 0) {
2397: error("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1.267 djm 2398: goto out;
2399: }
2400:
1.269 djm 2401: /* Figure out if we have any new keys to add */
2402: ctx->nnew = 0;
2403: for (i = 0; i < ctx->nkeys; i++) {
2404: if (!ctx->keys_seen[i])
2405: ctx->nnew++;
2406: }
2407:
2408: debug3("%s: %zu keys from server: %zu new, %zu retained. %zu to remove",
2409: __func__, ctx->nkeys, ctx->nnew, ctx->nkeys - ctx->nnew, ctx->nold);
2410:
2411: if (ctx->nnew == 0 && ctx->nold != 0) {
2412: /* We have some keys to remove. Just do it. */
2413: update_known_hosts(ctx);
2414: } else if (ctx->nnew != 0) {
2415: /*
2416: * We have received hitherto-unseen keys from the server.
2417: * Ask the server to confirm ownership of the private halves.
2418: */
2419: debug3("%s: asking server to prove ownership for %zu keys",
2420: __func__, ctx->nnew);
2421: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2422: (r = sshpkt_put_cstring(ssh,
1.270 djm 2423: "hostkeys-prove-00@openssh.com")) != 0 ||
1.269 djm 2424: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
2425: fatal("%s: cannot prepare packet: %s",
2426: __func__, ssh_err(r));
2427: if ((buf = sshbuf_new()) == NULL)
2428: fatal("%s: sshbuf_new", __func__);
2429: for (i = 0; i < ctx->nkeys; i++) {
2430: if (ctx->keys_seen[i])
2431: continue;
2432: sshbuf_reset(buf);
2433: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0)
2434: fatal("%s: sshkey_putb: %s",
2435: __func__, ssh_err(r));
2436: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
2437: fatal("%s: sshpkt_put_string: %s",
2438: __func__, ssh_err(r));
2439: }
2440: if ((r = sshpkt_send(ssh)) != 0)
2441: fatal("%s: sshpkt_send: %s", __func__, ssh_err(r));
2442: client_register_global_confirm(
2443: client_global_hostkeys_private_confirm, ctx);
2444: ctx = NULL; /* will be freed in callback */
2445: }
2446:
1.267 djm 2447: /* Success */
2448: out:
1.269 djm 2449: hostkeys_update_ctx_free(ctx);
1.267 djm 2450: sshkey_free(key);
2451: sshbuf_free(buf);
1.269 djm 2452: /*
2453: * NB. Return success for all cases. The server doesn't need to know
2454: * what the client does with its hosts file.
2455: */
2456: return 1;
1.267 djm 2457: }
2458:
1.264 markus 2459: static int
1.95 markus 2460: client_input_global_request(int type, u_int32_t seq, void *ctxt)
2461: {
2462: char *rtype;
2463: int want_reply;
2464: int success = 0;
2465:
1.267 djm 2466: rtype = packet_get_cstring(NULL);
1.95 markus 2467: want_reply = packet_get_char();
1.117 markus 2468: debug("client_input_global_request: rtype %s want_reply %d",
2469: rtype, want_reply);
1.270 djm 2470: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.267 djm 2471: success = client_input_hostkeys();
1.95 markus 2472: if (want_reply) {
2473: packet_start(success ?
2474: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
2475: packet_send();
2476: packet_write_wait();
2477: }
1.250 djm 2478: free(rtype);
1.264 markus 2479: return 0;
1.95 markus 2480: }
1.22 markus 2481:
1.123 djm 2482: void
1.129 deraadt 2483: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 2484: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 2485: {
2486: int len;
1.132 djm 2487: Channel *c = NULL;
1.123 djm 2488:
2489: debug2("%s: id %d", __func__, id);
2490:
1.132 djm 2491: if ((c = channel_lookup(id)) == NULL)
2492: fatal("client_session2_setup: channel %d: unknown channel", id);
1.224 djm 2493:
2494: packet_set_interactive(want_tty,
2495: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2496:
1.123 djm 2497: if (want_tty) {
2498: struct winsize ws;
2499:
2500: /* Store window size in the packet. */
2501: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2502: memset(&ws, 0, sizeof(ws));
2503:
1.190 djm 2504: channel_request_start(id, "pty-req", 1);
1.234 djm 2505: client_expect_confirm(id, "PTY allocation", CONFIRM_TTY);
1.123 djm 2506: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 2507: packet_put_int((u_int)ws.ws_col);
2508: packet_put_int((u_int)ws.ws_row);
2509: packet_put_int((u_int)ws.ws_xpixel);
2510: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 2511: if (tiop == NULL)
2512: tiop = get_saved_tio();
2513: tty_make_modes(-1, tiop);
1.123 djm 2514: packet_send();
2515: /* XXX wait for reply */
1.132 djm 2516: c->client_tty = 1;
1.123 djm 2517: }
2518:
2519: /* Transfer any environment variables from client to server */
1.126 djm 2520: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2521: int i, j, matched;
2522: char *name, *val;
2523:
2524: debug("Sending environment.");
1.126 djm 2525: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2526: /* Split */
1.126 djm 2527: name = xstrdup(env[i]);
1.123 djm 2528: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2529: free(name);
1.123 djm 2530: continue;
2531: }
2532: *val++ = '\0';
2533:
2534: matched = 0;
2535: for (j = 0; j < options.num_send_env; j++) {
2536: if (match_pattern(name, options.send_env[j])) {
2537: matched = 1;
2538: break;
2539: }
2540: }
2541: if (!matched) {
2542: debug3("Ignored env %s", name);
1.250 djm 2543: free(name);
1.123 djm 2544: continue;
2545: }
2546:
2547: debug("Sending env %s = %s", name, val);
2548: channel_request_start(id, "env", 0);
2549: packet_put_cstring(name);
2550: packet_put_cstring(val);
2551: packet_send();
1.250 djm 2552: free(name);
1.123 djm 2553: }
2554: }
2555:
2556: len = buffer_len(cmd);
2557: if (len > 0) {
2558: if (len > 900)
2559: len = 900;
2560: if (want_subsystem) {
1.190 djm 2561: debug("Sending subsystem: %.*s",
2562: len, (u_char*)buffer_ptr(cmd));
2563: channel_request_start(id, "subsystem", 1);
1.234 djm 2564: client_expect_confirm(id, "subsystem", CONFIRM_CLOSE);
1.123 djm 2565: } else {
1.190 djm 2566: debug("Sending command: %.*s",
2567: len, (u_char*)buffer_ptr(cmd));
2568: channel_request_start(id, "exec", 1);
1.234 djm 2569: client_expect_confirm(id, "exec", CONFIRM_CLOSE);
1.123 djm 2570: }
2571: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2572: packet_send();
2573: } else {
1.190 djm 2574: channel_request_start(id, "shell", 1);
1.234 djm 2575: client_expect_confirm(id, "shell", CONFIRM_CLOSE);
1.123 djm 2576: packet_send();
2577: }
2578: }
2579:
1.77 itojun 2580: static void
1.49 itojun 2581: client_init_dispatch_20(void)
1.16 markus 2582: {
1.55 markus 2583: dispatch_init(&dispatch_protocol_error);
1.100 markus 2584:
1.16 markus 2585: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2586: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2587: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2588: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2589: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2590: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2591: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2592: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2593: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2594: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2595: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2596: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2597:
2598: /* rekeying */
2599: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2600:
2601: /* global request reply messages */
2602: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2603: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 2604: }
1.197 djm 2605:
1.77 itojun 2606: static void
1.49 itojun 2607: client_init_dispatch_13(void)
1.15 markus 2608: {
2609: dispatch_init(NULL);
2610: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2611: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2612: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2613: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2614: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2615: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2616: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2617: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2618: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2619:
2620: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2621: &client_input_agent_open : &deny_input_open);
1.39 markus 2622: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2623: &x11_input_open : &deny_input_open);
1.15 markus 2624: }
1.197 djm 2625:
1.77 itojun 2626: static void
1.49 itojun 2627: client_init_dispatch_15(void)
1.15 markus 2628: {
2629: client_init_dispatch_13();
2630: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2631: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2632: }
1.197 djm 2633:
1.79 stevesk 2634: static void
1.49 itojun 2635: client_init_dispatch(void)
1.15 markus 2636: {
1.16 markus 2637: if (compat20)
2638: client_init_dispatch_20();
2639: else if (compat13)
1.15 markus 2640: client_init_dispatch_13();
2641: else
2642: client_init_dispatch_15();
1.232 djm 2643: }
2644:
2645: void
2646: client_stop_mux(void)
2647: {
2648: if (options.control_path != NULL && muxserver_sock != -1)
2649: unlink(options.control_path);
2650: /*
1.247 dtucker 2651: * If we are in persist mode, or don't have a shell, signal that we
2652: * should close when all active channels are closed.
1.232 djm 2653: */
1.247 dtucker 2654: if (options.control_persist || no_shell_flag) {
1.232 djm 2655: session_closed = 1;
1.235 djm 2656: setproctitle("[stopped mux]");
2657: }
1.113 markus 2658: }
2659:
2660: /* client specific fatal cleanup */
2661: void
1.114 markus 2662: cleanup_exit(int i)
1.113 markus 2663: {
1.233 djm 2664: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2665: leave_non_blocking();
1.192 djm 2666: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2667: unlink(options.control_path);
1.223 djm 2668: ssh_kill_proxy_command();
1.114 markus 2669: _exit(i);
1.1 deraadt 2670: }
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