Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.371
1.371 ! djm 1: /* $OpenBSD: clientloop.c,v 1.370 2021/08/29 23:44:07 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:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.189 djm 68: #include <sys/queue.h>
1.150 stevesk 69:
1.155 stevesk 70: #include <ctype.h>
1.168 stevesk 71: #include <errno.h>
1.151 stevesk 72: #include <paths.h>
1.153 stevesk 73: #include <signal.h>
1.174 stevesk 74: #include <stdio.h>
1.173 stevesk 75: #include <stdlib.h>
1.170 stevesk 76: #include <string.h>
1.328 deraadt 77: #include <stdarg.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 "ssh2.h"
1.1 deraadt 86: #include "packet.h"
1.315 markus 87: #include "sshbuf.h"
1.15 markus 88: #include "compat.h"
1.74 markus 89: #include "channels.h"
1.15 markus 90: #include "dispatch.h"
1.317 markus 91: #include "sshkey.h"
1.175 deraadt 92: #include "cipher.h"
1.54 markus 93: #include "kex.h"
1.275 markus 94: #include "myproposal.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"
1.262 djm 105: #include "ssherr.h"
1.267 djm 106: #include "hostfile.h"
1.319 djm 107:
1.39 markus 108: /* import options */
109: extern Options options;
1.1 deraadt 110:
1.123 djm 111: /* Control socket */
1.217 djm 112: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 113:
1.13 markus 114: /*
115: * Name of the host we are connecting to. This is the name given on the
1.324 jmc 116: * command line, or the Hostname specified for the user-supplied name in a
1.13 markus 117: * configuration file.
118: */
1.1 deraadt 119: extern char *host;
120:
1.13 markus 121: /*
1.330 djm 122: * If this field is not NULL, the ForwardAgent socket is this path and different
123: * instead of SSH_AUTH_SOCK.
124: */
125: extern char *forward_agent_sock_path;
126:
127: /*
1.13 markus 128: * Flag to indicate that we have received a window change signal which has
129: * not yet been processed. This will cause a message indicating the new
130: * window size to be sent to the server a little later. This is volatile
131: * because this is updated in a signal handler.
132: */
1.88 markus 133: static volatile sig_atomic_t received_window_change_signal = 0;
134: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 135:
1.222 djm 136: /* Time when backgrounded control master using ControlPersist should exit */
137: static time_t control_persist_exit_time = 0;
138:
1.1 deraadt 139: /* Common data for the client loop code. */
1.217 djm 140: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.11 markus 141: static int last_was_cr; /* Last character was a newline. */
1.197 djm 142: static int exit_status; /* Used to store the command exit status. */
1.315 markus 143: static struct sshbuf *stderr_buffer; /* Used for final exit message. */
1.11 markus 144: static int connection_in; /* Connection to server (input). */
145: static int connection_out; /* Connection to server (output). */
1.56 markus 146: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 147: static int session_closed; /* In SSH2: login session closed. */
1.274 djm 148: static u_int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.345 dtucker 149: static time_t server_alive_time; /* Time to do server_alive_check */
1.1 deraadt 150:
1.321 djm 151: static void client_init_dispatch(struct ssh *ssh);
1.16 markus 152: int session_ident = -1;
153:
1.195 djm 154: /* Track escape per proto2 channel */
155: struct escape_filter_ctx {
156: int escape_pending;
157: int escape_char;
158: };
159:
160: /* Context for channel confirmation replies */
1.190 djm 161: struct channel_reply_ctx {
162: const char *request_type;
1.234 djm 163: int id;
164: enum confirm_action action;
1.190 djm 165: };
166:
1.196 djm 167: /* Global request success/failure callbacks */
1.303 djm 168: /* XXX move to struct ssh? */
1.196 djm 169: struct global_confirm {
170: TAILQ_ENTRY(global_confirm) entry;
171: global_confirm_cb *cb;
172: void *ctx;
173: int ref_count;
174: };
175: TAILQ_HEAD(global_confirms, global_confirm);
176: static struct global_confirms global_confirms =
177: TAILQ_HEAD_INITIALIZER(global_confirms);
178:
1.315 markus 179: void ssh_process_session2_setup(int, int, int, struct sshbuf *);
1.123 djm 180:
1.13 markus 181: /*
182: * Signal handler for the window change signal (SIGWINCH). This just sets a
183: * flag indicating that the window has changed.
184: */
1.157 deraadt 185: /*ARGSUSED */
1.77 itojun 186: static void
1.11 markus 187: window_change_handler(int sig)
1.1 deraadt 188: {
1.11 markus 189: received_window_change_signal = 1;
1.1 deraadt 190: }
191:
1.13 markus 192: /*
193: * Signal handler for signals that cause the program to terminate. These
194: * signals must be trapped to restore terminal modes.
195: */
1.157 deraadt 196: /*ARGSUSED */
1.77 itojun 197: static void
1.11 markus 198: signal_handler(int sig)
1.1 deraadt 199: {
1.75 markus 200: received_signal = sig;
201: quit_pending = 1;
1.1 deraadt 202: }
203:
1.13 markus 204: /*
1.222 djm 205: * Sets control_persist_exit_time to the absolute time when the
206: * backgrounded control master should exit due to expiry of the
207: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
208: * control master process, or if there is no ControlPersist timeout.
209: */
210: static void
1.303 djm 211: set_control_persist_exit_time(struct ssh *ssh)
1.222 djm 212: {
213: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 214: || options.control_persist_timeout == 0) {
1.222 djm 215: /* not using a ControlPersist timeout */
216: control_persist_exit_time = 0;
1.303 djm 217: } else if (channel_still_open(ssh)) {
1.222 djm 218: /* some client connections are still open */
219: if (control_persist_exit_time > 0)
1.354 djm 220: debug2_f("cancel scheduled exit");
1.222 djm 221: control_persist_exit_time = 0;
222: } else if (control_persist_exit_time <= 0) {
223: /* a client connection has recently closed */
1.251 dtucker 224: control_persist_exit_time = monotime() +
1.222 djm 225: (time_t)options.control_persist_timeout;
1.354 djm 226: debug2_f("schedule exit in %d seconds",
1.222 djm 227: options.control_persist_timeout);
228: }
229: /* else we are already counting down to the timeout */
230: }
231:
1.238 dtucker 232: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
233: static int
234: client_x11_display_valid(const char *display)
235: {
236: size_t i, dlen;
237:
1.279 djm 238: if (display == NULL)
239: return 0;
240:
1.238 dtucker 241: dlen = strlen(display);
242: for (i = 0; i < dlen; i++) {
1.256 deraadt 243: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 244: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
245: debug("Invalid character '%c' in DISPLAY", display[i]);
246: return 0;
247: }
248: }
249: return 1;
250: }
251:
1.274 djm 252: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
253: #define X11_TIMEOUT_SLACK 60
1.279 djm 254: int
1.303 djm 255: client_x11_get_proto(struct ssh *ssh, const char *display,
256: const char *xauth_path, u_int trusted, u_int timeout,
257: char **_proto, char **_data)
1.138 djm 258: {
1.318 djm 259: char *cmd, line[512], xdisplay[512];
1.279 djm 260: char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
1.138 djm 261: static char proto[512], data[512];
262: FILE *f;
1.288 tedu 263: int got_data = 0, generated = 0, do_unlink = 0, r;
1.138 djm 264: struct stat st;
1.274 djm 265: u_int now, x11_timeout_real;
1.138 djm 266:
267: *_proto = proto;
268: *_data = data;
1.279 djm 269: proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
1.138 djm 270:
1.279 djm 271: if (!client_x11_display_valid(display)) {
1.283 millert 272: if (display != NULL)
273: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
274: display);
1.279 djm 275: return -1;
276: }
277: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
1.138 djm 278: debug("No xauth program.");
1.279 djm 279: xauth_path = NULL;
280: }
281:
282: if (xauth_path != NULL) {
1.138 djm 283: /*
284: * Handle FamilyLocal case where $DISPLAY does
285: * not match an authorization entry. For this we
286: * just try "xauth list unix:displaynum.screennum".
287: * XXX: "localhost" match to determine FamilyLocal
288: * is not perfect.
289: */
290: if (strncmp(display, "localhost:", 10) == 0) {
1.279 djm 291: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
292: display + 10)) < 0 ||
293: (size_t)r >= sizeof(xdisplay)) {
1.354 djm 294: error_f("display name too long");
1.279 djm 295: return -1;
296: }
1.138 djm 297: display = xdisplay;
298: }
299: if (trusted == 0) {
1.274 djm 300: /*
1.279 djm 301: * Generate an untrusted X11 auth cookie.
302: *
1.274 djm 303: * The authentication cookie should briefly outlive
304: * ssh's willingness to forward X11 connections to
305: * avoid nasty fail-open behaviour in the X server.
306: */
1.279 djm 307: mktemp_proto(xauthdir, sizeof(xauthdir));
308: if (mkdtemp(xauthdir) == NULL) {
1.354 djm 309: error_f("mkdtemp: %s", strerror(errno));
1.279 djm 310: return -1;
311: }
312: do_unlink = 1;
313: if ((r = snprintf(xauthfile, sizeof(xauthfile),
314: "%s/xauthfile", xauthdir)) < 0 ||
315: (size_t)r >= sizeof(xauthfile)) {
1.354 djm 316: error_f("xauthfile path too long");
1.279 djm 317: rmdir(xauthdir);
318: return -1;
319: }
320:
1.318 djm 321: if (timeout == 0) {
322: /* auth doesn't time out */
323: xasprintf(&cmd, "%s -f %s generate %s %s "
324: "untrusted 2>%s",
325: xauth_path, xauthfile, display,
326: SSH_X11_PROTO, _PATH_DEVNULL);
327: } else {
328: /* Add some slack to requested expiry */
329: if (timeout < UINT_MAX - X11_TIMEOUT_SLACK)
330: x11_timeout_real = timeout +
331: X11_TIMEOUT_SLACK;
332: else {
333: /* Don't overflow on long timeouts */
334: x11_timeout_real = UINT_MAX;
335: }
336: xasprintf(&cmd, "%s -f %s generate %s %s "
337: "untrusted timeout %u 2>%s",
338: xauth_path, xauthfile, display,
339: SSH_X11_PROTO, x11_timeout_real,
340: _PATH_DEVNULL);
341: }
1.354 djm 342: debug2_f("xauth command: %s", cmd);
1.318 djm 343:
344: if (timeout != 0 && x11_refuse_time == 0) {
1.279 djm 345: now = monotime() + 1;
346: if (UINT_MAX - timeout < now)
347: x11_refuse_time = UINT_MAX;
348: else
349: x11_refuse_time = now + timeout;
1.303 djm 350: channel_set_x11_refuse_time(ssh,
351: x11_refuse_time);
1.138 djm 352: }
1.279 djm 353: if (system(cmd) == 0)
354: generated = 1;
1.318 djm 355: free(cmd);
1.138 djm 356: }
1.181 markus 357:
358: /*
359: * When in untrusted mode, we read the cookie only if it was
360: * successfully generated as an untrusted one in the step
361: * above.
362: */
363: if (trusted || generated) {
1.318 djm 364: xasprintf(&cmd,
1.181 markus 365: "%s %s%s list %s 2>" _PATH_DEVNULL,
366: xauth_path,
367: generated ? "-f " : "" ,
368: generated ? xauthfile : "",
369: display);
370: debug2("x11_get_proto: %s", cmd);
371: f = popen(cmd, "r");
372: if (f && fgets(line, sizeof(line), f) &&
373: sscanf(line, "%*s %511s %511s", proto, data) == 2)
374: got_data = 1;
375: if (f)
376: pclose(f);
1.318 djm 377: free(cmd);
1.279 djm 378: }
1.138 djm 379: }
380:
381: if (do_unlink) {
382: unlink(xauthfile);
383: rmdir(xauthdir);
384: }
385:
1.279 djm 386: /* Don't fall back to fake X11 data for untrusted forwarding */
387: if (!trusted && !got_data) {
388: error("Warning: untrusted X11 forwarding setup failed: "
389: "xauth key data not generated");
390: return -1;
391: }
392:
1.138 djm 393: /*
394: * If we didn't get authentication data, just make up some
395: * data. The forwarding code will check the validity of the
396: * response anyway, and substitute this data. The X11
397: * server, however, will ignore this fake data and use
398: * whatever authentication mechanisms it was using otherwise
399: * for the local connection.
400: */
401: if (!got_data) {
1.288 tedu 402: u_int8_t rnd[16];
403: u_int i;
1.138 djm 404:
405: logit("Warning: No xauth data; "
406: "using fake authentication data for X11 forwarding.");
407: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.288 tedu 408: arc4random_buf(rnd, sizeof(rnd));
409: for (i = 0; i < sizeof(rnd); i++) {
1.138 djm 410: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.288 tedu 411: rnd[i]);
1.138 djm 412: }
413: }
1.279 djm 414:
415: return 0;
1.1 deraadt 416: }
417:
1.13 markus 418: /*
419: * Checks if the client window has changed, and sends a packet about it to
420: * the server if so. The actual change is detected elsewhere (by a software
421: * interrupt on Unix); this just checks the flag and sends a message if
422: * appropriate.
423: */
1.1 deraadt 424:
1.77 itojun 425: static void
1.303 djm 426: client_check_window_change(struct ssh *ssh)
1.1 deraadt 427: {
1.292 djm 428: if (!received_window_change_signal)
1.16 markus 429: return;
430: received_window_change_signal = 0;
1.354 djm 431: debug2_f("changed");
1.303 djm 432: channel_send_window_changes(ssh);
1.1 deraadt 433: }
434:
1.264 markus 435: static int
1.297 markus 436: client_global_request_reply(int type, u_int32_t seq, struct ssh *ssh)
1.117 markus 437: {
1.196 djm 438: struct global_confirm *gc;
439:
440: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 441: return 0;
1.196 djm 442: if (gc->cb != NULL)
1.303 djm 443: gc->cb(ssh, type, seq, gc->ctx);
1.196 djm 444: if (--gc->ref_count <= 0) {
445: TAILQ_REMOVE(&global_confirms, gc, entry);
1.342 jsg 446: freezero(gc, sizeof(*gc));
1.196 djm 447: }
448:
1.320 djm 449: ssh_packet_set_alive_timeouts(ssh, 0);
1.264 markus 450: return 0;
1.117 markus 451: }
452:
453: static void
1.345 dtucker 454: schedule_server_alive_check(void)
455: {
456: if (options.server_alive_interval > 0)
457: server_alive_time = monotime() + options.server_alive_interval;
458: }
459:
460: static void
1.320 djm 461: server_alive_check(struct ssh *ssh)
1.117 markus 462: {
1.320 djm 463: int r;
464:
465: if (ssh_packet_inc_alive_timeouts(ssh) > options.server_alive_count_max) {
1.228 djm 466: logit("Timeout, server %s not responding.", host);
1.176 markus 467: cleanup_exit(255);
468: }
1.320 djm 469: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
470: (r = sshpkt_put_cstring(ssh, "keepalive@openssh.com")) != 0 ||
471: (r = sshpkt_put_u8(ssh, 1)) != 0 || /* boolean: want reply */
472: (r = sshpkt_send(ssh)) != 0)
1.354 djm 473: fatal_fr(r, "send packet");
1.196 djm 474: /* Insert an empty placeholder to maintain ordering */
475: client_register_global_confirm(NULL, NULL);
1.345 dtucker 476: schedule_server_alive_check();
1.117 markus 477: }
478:
1.13 markus 479: /*
480: * Waits until the client can do something (some data becomes available on
481: * one of the file descriptors).
482: */
1.77 itojun 483: static void
1.303 djm 484: client_wait_until_can_do_something(struct ssh *ssh,
485: fd_set **readsetp, fd_set **writesetp,
1.130 avsm 486: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 487: {
1.117 markus 488: struct timeval tv, *tvp;
1.222 djm 489: int timeout_secs;
1.345 dtucker 490: time_t minwait_secs = 0, now = monotime();
1.315 markus 491: int r, ret;
1.117 markus 492:
1.46 markus 493: /* Add any selections by the channel mechanism. */
1.321 djm 494: channel_prepare_select(ssh, readsetp, writesetp, maxfdp,
1.302 djm 495: nallocp, &minwait_secs);
1.11 markus 496:
1.292 djm 497: /* channel_prepare_select could have closed the last channel */
1.303 djm 498: if (session_closed && !channel_still_open(ssh) &&
1.320 djm 499: !ssh_packet_have_data_to_write(ssh)) {
1.292 djm 500: /* clear mask since we did not call select() */
501: memset(*readsetp, 0, *nallocp);
502: memset(*writesetp, 0, *nallocp);
503: return;
1.16 markus 504: }
1.11 markus 505:
1.294 djm 506: FD_SET(connection_in, *readsetp);
507:
1.11 markus 508: /* Select server connection if have data to write to the server. */
1.320 djm 509: if (ssh_packet_have_data_to_write(ssh))
1.46 markus 510: FD_SET(connection_out, *writesetp);
1.11 markus 511:
1.13 markus 512: /*
513: * Wait for something to happen. This will suspend the process until
514: * some selected descriptor can be read, written, or has some other
1.222 djm 515: * event pending, or a timeout expires.
1.13 markus 516: */
1.11 markus 517:
1.222 djm 518: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.345 dtucker 519: if (options.server_alive_interval > 0)
520: timeout_secs = MAXIMUM(server_alive_time - now, 0);
1.292 djm 521: if (options.rekey_interval > 0 && !rekeying)
1.320 djm 522: timeout_secs = MINIMUM(timeout_secs,
523: ssh_packet_get_rekey_timeout(ssh));
1.303 djm 524: set_control_persist_exit_time(ssh);
1.222 djm 525: if (control_persist_exit_time > 0) {
1.287 deraadt 526: timeout_secs = MINIMUM(timeout_secs,
1.249 dtucker 527: control_persist_exit_time - now);
1.222 djm 528: if (timeout_secs < 0)
529: timeout_secs = 0;
530: }
1.239 djm 531: if (minwait_secs != 0)
1.287 deraadt 532: timeout_secs = MINIMUM(timeout_secs, (int)minwait_secs);
1.222 djm 533: if (timeout_secs == INT_MAX)
1.117 markus 534: tvp = NULL;
1.129 deraadt 535: else {
1.222 djm 536: tv.tv_sec = timeout_secs;
1.117 markus 537: tv.tv_usec = 0;
538: tvp = &tv;
539: }
1.222 djm 540:
1.117 markus 541: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
1.326 deraadt 542: if (ret == -1) {
1.51 markus 543: /*
544: * We have to clear the select masks, because we return.
545: * We have to return, because the mainloop checks for the flags
546: * set by the signal handlers.
547: */
1.87 markus 548: memset(*readsetp, 0, *nallocp);
549: memset(*writesetp, 0, *nallocp);
1.11 markus 550: if (errno == EINTR)
551: return;
552: /* Note: we might still have data in the buffers. */
1.315 markus 553: if ((r = sshbuf_putf(stderr_buffer,
554: "select: %s\r\n", strerror(errno))) != 0)
1.354 djm 555: fatal_fr(r, "sshbuf_putf");
1.11 markus 556: quit_pending = 1;
1.345 dtucker 557: } else if (options.server_alive_interval > 0 && !FD_ISSET(connection_in,
1.365 dtucker 558: *readsetp) && monotime() >= server_alive_time)
1.249 dtucker 559: /*
1.345 dtucker 560: * ServerAlive check is needed. We can't rely on the select
561: * timing out since traffic on the client side such as port
562: * forwards can keep waking it up.
1.249 dtucker 563: */
1.345 dtucker 564: server_alive_check(ssh);
1.11 markus 565: }
566:
1.77 itojun 567: static void
1.315 markus 568: client_suspend_self(struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr)
1.1 deraadt 569: {
1.11 markus 570: /* Flush stdout and stderr buffers. */
1.315 markus 571: if (sshbuf_len(bout) > 0)
572: atomicio(vwrite, fileno(stdout), sshbuf_mutable_ptr(bout),
573: sshbuf_len(bout));
574: if (sshbuf_len(berr) > 0)
575: atomicio(vwrite, fileno(stderr), sshbuf_mutable_ptr(berr),
576: sshbuf_len(berr));
1.11 markus 577:
1.233 djm 578: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 579:
1.305 djm 580: sshbuf_reset(bin);
581: sshbuf_reset(bout);
582: sshbuf_reset(berr);
1.11 markus 583:
584: /* Send the suspend signal to the program itself. */
585: kill(getpid(), SIGTSTP);
586:
1.132 djm 587: /* Reset window sizes in case they have changed */
588: received_window_change_signal = 1;
1.11 markus 589:
1.233 djm 590: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 591: }
592:
1.77 itojun 593: static void
1.320 djm 594: client_process_net_input(struct ssh *ssh, fd_set *readset)
1.11 markus 595: {
1.17 markus 596: char buf[8192];
1.315 markus 597: int r, len;
1.11 markus 598:
1.13 markus 599: /*
600: * Read input from the server, and add any such data to the buffer of
601: * the packet subsystem.
602: */
1.11 markus 603: if (FD_ISSET(connection_in, readset)) {
1.345 dtucker 604: schedule_server_alive_check();
1.11 markus 605: /* Read as much as possible. */
1.280 markus 606: len = read(connection_in, buf, sizeof(buf));
607: if (len == 0) {
1.197 djm 608: /*
609: * Received EOF. The remote host has closed the
610: * connection.
611: */
1.315 markus 612: if ((r = sshbuf_putf(stderr_buffer,
1.197 djm 613: "Connection to %.300s closed by remote host.\r\n",
1.315 markus 614: host)) != 0)
1.354 djm 615: fatal_fr(r, "sshbuf_putf");
1.1 deraadt 616: quit_pending = 1;
617: return;
1.11 markus 618: }
1.13 markus 619: /*
620: * There is a kernel bug on Solaris that causes select to
621: * sometimes wake up even though there is no data available.
622: */
1.326 deraadt 623: if (len == -1 && (errno == EAGAIN || errno == EINTR))
1.11 markus 624: len = 0;
625:
1.326 deraadt 626: if (len == -1) {
1.197 djm 627: /*
628: * An error has encountered. Perhaps there is a
629: * network problem.
630: */
1.315 markus 631: if ((r = sshbuf_putf(stderr_buffer,
1.197 djm 632: "Read from remote host %.300s: %.100s\r\n",
1.315 markus 633: host, strerror(errno))) != 0)
1.354 djm 634: fatal_fr(r, "sshbuf_putf");
1.11 markus 635: quit_pending = 1;
636: return;
637: }
1.320 djm 638: ssh_packet_process_incoming(ssh, buf, len);
1.11 markus 639: }
1.17 markus 640: }
1.16 markus 641:
1.97 jakob 642: static void
1.303 djm 643: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 644: {
1.190 djm 645: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
646: char errmsg[256];
1.315 markus 647: int r, tochan;
1.190 djm 648:
1.234 djm 649: /*
650: * If a TTY was explicitly requested, then a failure to allocate
651: * one is fatal.
652: */
653: if (cr->action == CONFIRM_TTY &&
654: (options.request_tty == REQUEST_TTY_FORCE ||
655: options.request_tty == REQUEST_TTY_YES))
656: cr->action = CONFIRM_CLOSE;
657:
1.312 djm 658: /* XXX suppress on mux _client_ quietmode */
1.190 djm 659: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 660: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 661:
662: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
663: debug2("%s request accepted on channel %d",
664: cr->request_type, c->self);
665: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
666: if (tochan) {
667: snprintf(errmsg, sizeof(errmsg),
668: "%s request failed\r\n", cr->request_type);
669: } else {
670: snprintf(errmsg, sizeof(errmsg),
671: "%s request failed on channel %d",
672: cr->request_type, c->self);
673: }
674: /* If error occurred on primary session channel, then exit */
1.234 djm 675: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 676: fatal("%s", errmsg);
1.234 djm 677: /*
678: * If error occurred on mux client, append to
679: * their stderr.
680: */
681: if (tochan) {
1.360 djm 682: debug3_f("channel %d: mux request: %s", c->self,
683: cr->request_type);
1.315 markus 684: if ((r = sshbuf_put(c->extended, errmsg,
685: strlen(errmsg))) != 0)
1.354 djm 686: fatal_fr(r, "sshbuf_put");
1.234 djm 687: } else
1.190 djm 688: error("%s", errmsg);
1.234 djm 689: if (cr->action == CONFIRM_TTY) {
690: /*
691: * If a TTY allocation error occurred, then arrange
692: * for the correct TTY to leave raw mode.
693: */
694: if (c->self == session_ident)
695: leave_raw_mode(0);
696: else
1.303 djm 697: mux_tty_alloc_failed(ssh, c);
1.234 djm 698: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 699: chan_read_failed(ssh, c);
700: chan_write_failed(ssh, c);
1.190 djm 701: }
702: }
1.250 djm 703: free(cr);
1.190 djm 704: }
705:
706: static void
1.303 djm 707: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 708: {
1.250 djm 709: free(ctx);
1.190 djm 710: }
1.129 deraadt 711:
1.236 djm 712: void
1.303 djm 713: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 714: enum confirm_action action)
1.190 djm 715: {
1.255 djm 716: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 717:
1.190 djm 718: cr->request_type = request;
1.234 djm 719: cr->action = action;
1.123 djm 720:
1.303 djm 721: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 722: client_abandon_status_confirm, cr);
1.196 djm 723: }
724:
725: void
726: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
727: {
1.201 djm 728: struct global_confirm *gc, *last_gc;
1.196 djm 729:
730: /* Coalesce identical callbacks */
1.201 djm 731: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
732: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
733: if (++last_gc->ref_count >= INT_MAX)
1.354 djm 734: fatal_f("last_gc->ref_count = %d",
735: last_gc->ref_count);
1.196 djm 736: return;
737: }
738:
1.255 djm 739: gc = xcalloc(1, sizeof(*gc));
1.196 djm 740: gc->cb = cb;
741: gc->ctx = ctx;
742: gc->ref_count = 1;
743: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 744: }
745:
746: static void
1.303 djm 747: process_cmdline(struct ssh *ssh)
1.97 jakob 748: {
749: void (*handler)(int);
1.261 millert 750: char *s, *cmd;
751: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
752: struct Forward fwd;
1.97 jakob 753:
1.257 tedu 754: memset(&fwd, 0, sizeof(fwd));
1.183 djm 755:
1.233 djm 756: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.332 dtucker 757: handler = ssh_signal(SIGINT, SIG_IGN);
1.99 markus 758: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 759: if (s == NULL)
760: goto out;
1.256 deraadt 761: while (isspace((u_char)*s))
1.97 jakob 762: s++;
1.121 djm 763: if (*s == '-')
764: s++; /* Skip cmdline '-', if any */
1.120 dtucker 765: if (*s == '\0')
1.97 jakob 766: goto out;
1.121 djm 767:
1.122 djm 768: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 769: logit("Commands:");
1.164 djm 770: logit(" -L[bind_address:]port:host:hostport "
771: "Request local forward");
772: logit(" -R[bind_address:]port:host:hostport "
773: "Request remote forward");
1.204 stevesk 774: logit(" -D[bind_address:]port "
775: "Request dynamic forward");
1.237 markus 776: logit(" -KL[bind_address:]port "
777: "Cancel local forward");
1.165 stevesk 778: logit(" -KR[bind_address:]port "
1.164 djm 779: "Cancel remote forward");
1.237 markus 780: logit(" -KD[bind_address:]port "
781: "Cancel dynamic forward");
1.146 reyk 782: if (!options.permit_local_command)
783: goto out;
1.164 djm 784: logit(" !args "
785: "Execute local command");
1.146 reyk 786: goto out;
787: }
788:
789: if (*s == '!' && options.permit_local_command) {
790: s++;
791: ssh_local_cmd(s);
1.121 djm 792: goto out;
793: }
794:
795: if (*s == 'K') {
796: delete = 1;
797: s++;
798: }
1.204 stevesk 799: if (*s == 'L')
800: local = 1;
801: else if (*s == 'R')
802: remote = 1;
803: else if (*s == 'D')
804: dynamic = 1;
805: else {
1.109 itojun 806: logit("Invalid command.");
1.97 jakob 807: goto out;
808: }
1.204 stevesk 809:
1.256 deraadt 810: while (isspace((u_char)*++s))
1.179 tedu 811: ;
1.97 jakob 812:
1.217 djm 813: /* XXX update list of forwards in options */
1.121 djm 814: if (delete) {
1.261 millert 815: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
816: if (!parse_forward(&fwd, s, 1, 0)) {
817: logit("Bad forwarding close specification.");
1.121 djm 818: goto out;
819: }
1.237 markus 820: if (remote)
1.303 djm 821: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 822: else if (dynamic)
1.303 djm 823: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 824: 0, &options.fwd_opts) > 0;
1.237 markus 825: else
1.303 djm 826: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 827: CHANNEL_CANCEL_PORT_STATIC,
828: &options.fwd_opts) > 0;
1.237 markus 829: if (!ok) {
1.290 dtucker 830: logit("Unknown port forwarding.");
1.237 markus 831: goto out;
832: }
833: logit("Canceled forwarding.");
1.121 djm 834: } else {
1.209 djm 835: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 836: logit("Bad forwarding specification.");
837: goto out;
838: }
1.204 stevesk 839: if (local || dynamic) {
1.303 djm 840: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 841: &options.fwd_opts)) {
1.121 djm 842: logit("Port forwarding failed.");
843: goto out;
844: }
1.135 djm 845: } else {
1.303 djm 846: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 847: logit("Port forwarding failed.");
848: goto out;
849: }
1.135 djm 850: }
1.121 djm 851: logit("Forwarding port.");
852: }
853:
1.97 jakob 854: out:
1.332 dtucker 855: ssh_signal(SIGINT, handler);
1.233 djm 856: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 857: free(cmd);
858: free(fwd.listen_host);
1.261 millert 859: free(fwd.listen_path);
1.250 djm 860: free(fwd.connect_host);
1.261 millert 861: free(fwd.connect_path);
1.97 jakob 862: }
863:
1.244 dtucker 864: /* reasons to suppress output of an escape command in help output */
865: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 866: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
867: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
868: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.244 dtucker 869: struct escape_help_text {
870: const char *cmd;
871: const char *text;
872: unsigned int flags;
873: };
874: static struct escape_help_text esc_txt[] = {
875: {".", "terminate session", SUPPRESS_MUXMASTER},
876: {".", "terminate connection (and any multiplexed sessions)",
877: SUPPRESS_MUXCLIENT},
1.292 djm 878: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.244 dtucker 879: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1.292 djm 880: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 881: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 882: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
883: {"#", "list forwarded connections", SUPPRESS_NEVER},
884: {"&", "background ssh (when waiting for connections to terminate)",
885: SUPPRESS_MUXCLIENT},
886: {"?", "this message", SUPPRESS_NEVER},
887: };
888:
889: static void
1.315 markus 890: print_escape_help(struct sshbuf *b, int escape_char, int mux_client,
891: int using_stderr)
1.244 dtucker 892: {
893: unsigned int i, suppress_flags;
1.315 markus 894: int r;
1.244 dtucker 895:
1.315 markus 896: if ((r = sshbuf_putf(b,
897: "%c?\r\nSupported escape sequences:\r\n", escape_char)) != 0)
1.354 djm 898: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 899:
1.292 djm 900: suppress_flags =
1.244 dtucker 901: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
902: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
903: (using_stderr ? 0 : SUPPRESS_SYSLOG);
904:
905: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
906: if (esc_txt[i].flags & suppress_flags)
907: continue;
1.315 markus 908: if ((r = sshbuf_putf(b, " %c%-3s - %s\r\n",
909: escape_char, esc_txt[i].cmd, esc_txt[i].text)) != 0)
1.354 djm 910: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 911: }
912:
1.315 markus 913: if ((r = sshbuf_putf(b,
1.246 dtucker 914: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 915: "(Note that escapes are only recognized immediately after "
1.315 markus 916: "newline.)\r\n", escape_char, escape_char)) != 0)
1.354 djm 917: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 918: }
919:
1.314 djm 920: /*
1.296 naddy 921: * Process the characters one by one.
1.195 djm 922: */
1.77 itojun 923: static int
1.303 djm 924: process_escapes(struct ssh *ssh, Channel *c,
1.315 markus 925: struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr,
1.195 djm 926: char *buf, int len)
1.31 markus 927: {
928: pid_t pid;
1.315 markus 929: int r, bytes = 0;
1.42 markus 930: u_int i;
931: u_char ch;
1.31 markus 932: char *s;
1.294 djm 933: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
934: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 935:
1.294 djm 936: if (c->filter_ctx == NULL)
937: return 0;
1.314 djm 938:
1.139 djm 939: if (len <= 0)
940: return (0);
941:
942: for (i = 0; i < (u_int)len; i++) {
1.31 markus 943: /* Get one character at a time. */
944: ch = buf[i];
945:
1.294 djm 946: if (efc->escape_pending) {
1.31 markus 947: /* We have previously seen an escape character. */
948: /* Clear the flag now. */
1.294 djm 949: efc->escape_pending = 0;
1.31 markus 950:
951: /* Process the escaped character. */
952: switch (ch) {
953: case '.':
954: /* Terminate the connection. */
1.315 markus 955: if ((r = sshbuf_putf(berr, "%c.\r\n",
956: efc->escape_char)) != 0)
1.354 djm 957: fatal_fr(r, "sshbuf_putf");
1.217 djm 958: if (c && c->ctl_chan != -1) {
1.303 djm 959: chan_read_failed(ssh, c);
960: chan_write_failed(ssh, c);
961: if (c->detach_user) {
962: c->detach_user(ssh,
963: c->self, NULL);
964: }
1.253 dtucker 965: c->type = SSH_CHANNEL_ABANDONED;
1.315 markus 966: sshbuf_reset(c->input);
1.303 djm 967: chan_ibuf_empty(ssh, c);
1.195 djm 968: return 0;
969: } else
970: quit_pending = 1;
1.31 markus 971: return -1;
972:
973: case 'Z' - 64:
1.195 djm 974: /* XXX support this for mux clients */
1.217 djm 975: if (c && c->ctl_chan != -1) {
1.245 dtucker 976: char b[16];
1.195 djm 977: noescape:
1.245 dtucker 978: if (ch == 'Z' - 64)
979: snprintf(b, sizeof b, "^Z");
980: else
981: snprintf(b, sizeof b, "%c", ch);
1.315 markus 982: if ((r = sshbuf_putf(berr,
1.245 dtucker 983: "%c%s escape not available to "
1.195 djm 984: "multiplexed sessions\r\n",
1.315 markus 985: efc->escape_char, b)) != 0)
1.354 djm 986: fatal_fr(r, "sshbuf_putf");
1.195 djm 987: continue;
988: }
1.197 djm 989: /* Suspend the program. Inform the user */
1.315 markus 990: if ((r = sshbuf_putf(berr,
991: "%c^Z [suspend ssh]\r\n",
992: efc->escape_char)) != 0)
1.354 djm 993: fatal_fr(r, "sshbuf_putf");
1.31 markus 994:
995: /* Restore terminal modes and suspend. */
996: client_suspend_self(bin, bout, berr);
997:
998: /* We have been continued. */
999: continue;
1000:
1.111 markus 1001: case 'B':
1.315 markus 1002: if ((r = sshbuf_putf(berr,
1003: "%cB\r\n", efc->escape_char)) != 0)
1.354 djm 1004: fatal_fr(r, "sshbuf_putf");
1.303 djm 1005: channel_request_start(ssh, c->self, "break", 0);
1.315 markus 1006: if ((r = sshpkt_put_u32(ssh, 1000)) != 0 ||
1007: (r = sshpkt_send(ssh)) != 0)
1.354 djm 1008: fatal_fr(r, "send packet");
1.111 markus 1009: continue;
1010:
1.54 markus 1011: case 'R':
1.357 djm 1012: if (ssh->compat & SSH_BUG_NOREKEY)
1.292 djm 1013: logit("Server does not "
1014: "support re-keying");
1015: else
1016: need_rekeying = 1;
1.54 markus 1017: continue;
1018:
1.242 dtucker 1019: case 'V':
1020: /* FALLTHROUGH */
1021: case 'v':
1022: if (c && c->ctl_chan != -1)
1023: goto noescape;
1024: if (!log_is_on_stderr()) {
1.315 markus 1025: if ((r = sshbuf_putf(berr,
1.242 dtucker 1026: "%c%c [Logging to syslog]\r\n",
1.315 markus 1027: efc->escape_char, ch)) != 0)
1.354 djm 1028: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1029: continue;
1030: }
1031: if (ch == 'V' && options.log_level >
1032: SYSLOG_LEVEL_QUIET)
1033: log_change_level(--options.log_level);
1034: if (ch == 'v' && options.log_level <
1035: SYSLOG_LEVEL_DEBUG3)
1036: log_change_level(++options.log_level);
1.315 markus 1037: if ((r = sshbuf_putf(berr,
1.294 djm 1038: "%c%c [LogLevel %s]\r\n",
1039: efc->escape_char, ch,
1.315 markus 1040: log_level_name(options.log_level))) != 0)
1.354 djm 1041: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1042: continue;
1043:
1.31 markus 1044: case '&':
1.217 djm 1045: if (c && c->ctl_chan != -1)
1.195 djm 1046: goto noescape;
1.31 markus 1047: /*
1.197 djm 1048: * Detach the program (continue to serve
1049: * connections, but put in background and no
1050: * more new connections).
1.31 markus 1051: */
1052: /* Restore tty modes. */
1.233 djm 1053: leave_raw_mode(
1054: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1055:
1056: /* Stop listening for new connections. */
1.303 djm 1057: channel_stop_listening(ssh);
1.31 markus 1058:
1.354 djm 1059: if ((r = sshbuf_putf(berr, "%c& "
1060: "[backgrounded]\n", efc->escape_char)) != 0)
1061: fatal_fr(r, "sshbuf_putf");
1.31 markus 1062:
1063: /* Fork into background. */
1064: pid = fork();
1.326 deraadt 1065: if (pid == -1) {
1.31 markus 1066: error("fork: %.100s", strerror(errno));
1067: continue;
1068: }
1069: if (pid != 0) { /* This is the parent. */
1070: /* The parent just exits. */
1071: exit(0);
1072: }
1073: /* The child continues serving connections. */
1.292 djm 1074: /* fake EOF on stdin */
1.315 markus 1075: if ((r = sshbuf_put_u8(bin, 4)) != 0)
1.354 djm 1076: fatal_fr(r, "sshbuf_put_u8");
1.292 djm 1077: return -1;
1.31 markus 1078: case '?':
1.294 djm 1079: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1080: (c && c->ctl_chan != -1),
1081: log_is_on_stderr());
1.31 markus 1082: continue;
1083:
1084: case '#':
1.315 markus 1085: if ((r = sshbuf_putf(berr, "%c#\r\n",
1086: efc->escape_char)) != 0)
1.354 djm 1087: fatal_fr(r, "sshbuf_putf");
1.303 djm 1088: s = channel_open_message(ssh);
1.315 markus 1089: if ((r = sshbuf_put(berr, s, strlen(s))) != 0)
1.354 djm 1090: fatal_fr(r, "sshbuf_put");
1.250 djm 1091: free(s);
1.97 jakob 1092: continue;
1093:
1094: case 'C':
1.217 djm 1095: if (c && c->ctl_chan != -1)
1.206 djm 1096: goto noescape;
1.303 djm 1097: process_cmdline(ssh);
1.31 markus 1098: continue;
1099:
1100: default:
1.294 djm 1101: if (ch != efc->escape_char) {
1.315 markus 1102: if ((r = sshbuf_put_u8(bin,
1103: efc->escape_char)) != 0)
1.354 djm 1104: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1105: bytes++;
1106: }
1107: /* Escaped characters fall through here */
1108: break;
1109: }
1110: } else {
1111: /*
1.197 djm 1112: * The previous character was not an escape char.
1113: * Check if this is an escape.
1.31 markus 1114: */
1.294 djm 1115: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1116: /*
1117: * It is. Set the flag and continue to
1118: * next character.
1119: */
1.294 djm 1120: efc->escape_pending = 1;
1.31 markus 1121: continue;
1122: }
1123: }
1124:
1125: /*
1126: * Normal character. Record whether it was a newline,
1127: * and append it to the buffer.
1128: */
1129: last_was_cr = (ch == '\r' || ch == '\n');
1.315 markus 1130: if ((r = sshbuf_put_u8(bin, ch)) != 0)
1.354 djm 1131: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1132: bytes++;
1133: }
1134: return bytes;
1135: }
1136:
1.13 markus 1137: /*
1.15 markus 1138: * Get packets from the connection input buffer, and process them as long as
1139: * there are packets available.
1140: *
1141: * Any unknown packets received during the actual
1142: * session cause the session to terminate. This is
1143: * intended to make debugging easier since no
1144: * confirmations are sent. Any compatible protocol
1145: * extensions must be negotiated during the
1146: * preparatory phase.
1147: */
1148:
1.77 itojun 1149: static void
1.321 djm 1150: client_process_buffered_input_packets(struct ssh *ssh)
1.15 markus 1151: {
1.321 djm 1152: ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1153: }
1154:
1.31 markus 1155: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1156:
1.195 djm 1157: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1158: void *
1159: client_new_escape_filter_ctx(int escape_char)
1160: {
1161: struct escape_filter_ctx *ret;
1162:
1.255 djm 1163: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1164: ret->escape_pending = 0;
1165: ret->escape_char = escape_char;
1166: return (void *)ret;
1167: }
1168:
1.198 djm 1169: /* Free the escape filter context on channel free */
1170: void
1.303 djm 1171: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1172: {
1.250 djm 1173: free(ctx);
1.198 djm 1174: }
1175:
1.195 djm 1176: int
1.303 djm 1177: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1178: {
1.190 djm 1179: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1180: return 0;
1181:
1.303 djm 1182: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1183: buf, len);
1.30 markus 1184: }
1185:
1.77 itojun 1186: static void
1.303 djm 1187: client_channel_closed(struct ssh *ssh, int id, void *arg)
1.60 markus 1188: {
1.303 djm 1189: channel_cancel_cleanup(ssh, id);
1.60 markus 1190: session_closed = 1;
1.233 djm 1191: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1192: }
1193:
1.15 markus 1194: /*
1.13 markus 1195: * Implements the interactive session with the server. This is called after
1196: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1197: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1198: * used as an escape character for terminating or suspending the session.
1.13 markus 1199: */
1.20 markus 1200: int
1.303 djm 1201: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1202: int ssh2_chan_id)
1.1 deraadt 1203: {
1.46 markus 1204: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1205: double start_time, total_time;
1.284 djm 1206: int r, max_fd = 0, max_fd2 = 0, len;
1.200 markus 1207: u_int64_t ibytes, obytes;
1.130 avsm 1208: u_int nalloc = 0;
1.11 markus 1209:
1210: debug("Entering interactive session.");
1.277 semarie 1211:
1.278 semarie 1212: if (options.control_master &&
1.286 djm 1213: !option_clear_or_none(options.control_path)) {
1.278 semarie 1214: debug("pledge: id");
1.327 mestre 1215: if (pledge("stdio rpath wpath cpath unix inet dns recvfd sendfd proc exec id tty",
1.278 semarie 1216: NULL) == -1)
1.354 djm 1217: fatal_f("pledge(): %s", strerror(errno));
1.278 semarie 1218:
1219: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1220: debug("pledge: exec");
1221: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1222: NULL) == -1)
1.354 djm 1223: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1224:
1225: } else if (options.update_hostkeys) {
1.371 ! djm 1226: debug("pledge: fileystem");
1.277 semarie 1227: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1228: NULL) == -1)
1.354 djm 1229: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1230:
1.286 djm 1231: } else if (!option_clear_or_none(options.proxy_command) ||
1.369 djm 1232: options.fork_after_authentication) {
1.277 semarie 1233: debug("pledge: proc");
1234: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1.354 djm 1235: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1236:
1237: } else {
1238: debug("pledge: network");
1.300 mestre 1239: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.354 djm 1240: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1241: }
1.11 markus 1242:
1.307 dtucker 1243: start_time = monotime_double();
1.11 markus 1244:
1245: /* Initialize variables. */
1246: last_was_cr = 1;
1247: exit_status = -1;
1.320 djm 1248: connection_in = ssh_packet_get_connection_in(ssh);
1249: connection_out = ssh_packet_get_connection_out(ssh);
1.287 deraadt 1250: max_fd = MAXIMUM(connection_in, connection_out);
1.46 markus 1251:
1.11 markus 1252: quit_pending = 0;
1253:
1.315 markus 1254: /* Initialize buffer. */
1255: if ((stderr_buffer = sshbuf_new()) == NULL)
1.354 djm 1256: fatal_f("sshbuf_new failed");
1.11 markus 1257:
1.321 djm 1258: client_init_dispatch(ssh);
1.15 markus 1259:
1.105 markus 1260: /*
1261: * Set signal handlers, (e.g. to restore non-blocking mode)
1262: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1263: */
1.332 dtucker 1264: if (ssh_signal(SIGHUP, SIG_IGN) != SIG_IGN)
1265: ssh_signal(SIGHUP, signal_handler);
1266: if (ssh_signal(SIGINT, SIG_IGN) != SIG_IGN)
1267: ssh_signal(SIGINT, signal_handler);
1268: if (ssh_signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1269: ssh_signal(SIGQUIT, signal_handler);
1270: if (ssh_signal(SIGTERM, SIG_IGN) != SIG_IGN)
1271: ssh_signal(SIGTERM, signal_handler);
1272: ssh_signal(SIGWINCH, window_change_handler);
1.11 markus 1273:
1274: if (have_pty)
1.233 djm 1275: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1276:
1.292 djm 1277: session_ident = ssh2_chan_id;
1278: if (session_ident != -1) {
1279: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1280: channel_register_filter(ssh, session_ident,
1.292 djm 1281: client_simple_escape_filter, NULL,
1282: client_filter_cleanup,
1283: client_new_escape_filter_ctx(
1284: escape_char_arg));
1.232 djm 1285: }
1.303 djm 1286: channel_register_cleanup(ssh, session_ident,
1.292 djm 1287: client_channel_closed, 0);
1.48 markus 1288: }
1.345 dtucker 1289:
1290: schedule_server_alive_check();
1.30 markus 1291:
1.11 markus 1292: /* Main loop of the client for the interactive session mode. */
1293: while (!quit_pending) {
1294:
1.13 markus 1295: /* Process buffered packets sent by the server. */
1.321 djm 1296: client_process_buffered_input_packets(ssh);
1.11 markus 1297:
1.303 djm 1298: if (session_closed && !channel_still_open(ssh))
1.60 markus 1299: break;
1300:
1.303 djm 1301: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1302: debug("rekeying in progress");
1.284 djm 1303: } else if (need_rekeying) {
1304: /* manual rekey request */
1305: debug("need rekeying");
1.303 djm 1306: if ((r = kex_start_rekex(ssh)) != 0)
1.354 djm 1307: fatal_fr(r, "kex_start_rekex");
1.284 djm 1308: need_rekeying = 0;
1.56 markus 1309: } else {
1310: /*
1311: * Make packets from buffered channel data, and
1312: * enqueue them for sending to the server.
1313: */
1.320 djm 1314: if (ssh_packet_not_very_much_data_to_write(ssh))
1.303 djm 1315: channel_output_poll(ssh);
1.11 markus 1316:
1.56 markus 1317: /*
1318: * Check if the window size has changed, and buffer a
1319: * message about it to the server if so.
1320: */
1.303 djm 1321: client_check_window_change(ssh);
1.11 markus 1322:
1.56 markus 1323: if (quit_pending)
1324: break;
1325: }
1.13 markus 1326: /*
1327: * Wait until we have something to do (something becomes
1328: * available on one of the descriptors).
1329: */
1.81 markus 1330: max_fd2 = max_fd;
1.303 djm 1331: client_wait_until_can_do_something(ssh, &readset, &writeset,
1332: &max_fd2, &nalloc, ssh_packet_is_rekeying(ssh));
1.11 markus 1333:
1334: if (quit_pending)
1335: break;
1336:
1.56 markus 1337: /* Do channel operations unless rekeying in progress. */
1.303 djm 1338: if (!ssh_packet_is_rekeying(ssh))
1339: channel_after_select(ssh, readset, writeset);
1.11 markus 1340:
1.17 markus 1341: /* Buffer input from the connection. */
1.320 djm 1342: client_process_net_input(ssh, readset);
1.17 markus 1343:
1344: if (quit_pending)
1345: break;
1.367 djm 1346:
1347: /* A timeout may have triggered rekeying */
1348: if ((r = ssh_packet_check_rekey(ssh)) != 0)
1349: fatal_fr(r, "cannot start rekeying");
1.11 markus 1350:
1.197 djm 1351: /*
1352: * Send as much buffered packet data as possible to the
1353: * sender.
1354: */
1.338 djm 1355: if (FD_ISSET(connection_out, writeset)) {
1356: if ((r = ssh_packet_write_poll(ssh)) != 0) {
1357: sshpkt_fatal(ssh, r,
1358: "%s: ssh_packet_write_poll", __func__);
1359: }
1360: }
1.222 djm 1361:
1362: /*
1363: * If we are a backgrounded control master, and the
1364: * timeout has expired without any active client
1365: * connections, then quit.
1366: */
1367: if (control_persist_exit_time > 0) {
1.251 dtucker 1368: if (monotime() >= control_persist_exit_time) {
1.222 djm 1369: debug("ControlPersist timeout expired");
1370: break;
1371: }
1372: }
1.11 markus 1373: }
1.250 djm 1374: free(readset);
1375: free(writeset);
1.11 markus 1376:
1377: /* Terminate the session. */
1378:
1379: /* Stop watching for window change. */
1.332 dtucker 1380: ssh_signal(SIGWINCH, SIG_DFL);
1.211 andreas 1381:
1.320 djm 1382: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
1383: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_BY_APPLICATION)) != 0 ||
1384: (r = sshpkt_put_cstring(ssh, "disconnected by user")) != 0 ||
1385: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language tag */
1386: (r = sshpkt_send(ssh)) != 0 ||
1387: (r = ssh_packet_write_wait(ssh)) != 0)
1.354 djm 1388: fatal_fr(r, "send disconnect");
1.11 markus 1389:
1.303 djm 1390: channel_free_all(ssh);
1.11 markus 1391:
1.75 markus 1392: if (have_pty)
1.233 djm 1393: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.116 dtucker 1394:
1395: /*
1396: * If there was no shell or command requested, there will be no remote
1397: * exit status to be returned. In that case, clear error code if the
1398: * connection was deliberately terminated at this end.
1399: */
1.370 djm 1400: if (options.session_type == SESSION_TYPE_NONE &&
1401: received_signal == SIGTERM) {
1.116 dtucker 1402: received_signal = 0;
1403: exit_status = 0;
1404: }
1.75 markus 1405:
1.301 dtucker 1406: if (received_signal) {
1407: verbose("Killed by signal %d.", (int) received_signal);
1.359 djm 1408: cleanup_exit(255);
1.301 dtucker 1409: }
1.75 markus 1410:
1.13 markus 1411: /*
1412: * In interactive mode (with pseudo tty) display a message indicating
1413: * that the connection has been closed.
1414: */
1.11 markus 1415: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.315 markus 1416: if ((r = sshbuf_putf(stderr_buffer,
1417: "Connection to %.64s closed.\r\n", host)) != 0)
1.354 djm 1418: fatal_fr(r, "sshbuf_putf");
1.11 markus 1419: }
1.70 markus 1420:
1.11 markus 1421: /* Output any buffered data for stderr. */
1.315 markus 1422: if (sshbuf_len(stderr_buffer) > 0) {
1.230 djm 1423: len = atomicio(vwrite, fileno(stderr),
1.315 markus 1424: (u_char *)sshbuf_ptr(stderr_buffer),
1425: sshbuf_len(stderr_buffer));
1426: if (len < 0 || (u_int)len != sshbuf_len(stderr_buffer))
1.11 markus 1427: error("Write failed flushing stderr buffer.");
1.315 markus 1428: else if ((r = sshbuf_consume(stderr_buffer, len)) != 0)
1.354 djm 1429: fatal_fr(r, "sshbuf_consume");
1.11 markus 1430: }
1431:
1432: /* Clear and free any buffers. */
1.315 markus 1433: sshbuf_free(stderr_buffer);
1.11 markus 1434:
1435: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1436: total_time = monotime_double() - start_time;
1.320 djm 1437: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.200 markus 1438: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1439: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1440: if (total_time > 0)
1.200 markus 1441: verbose("Bytes per second: sent %.1f, received %.1f",
1442: obytes / total_time, ibytes / total_time);
1.11 markus 1443: /* Return the exit status of the program. */
1444: debug("Exit status %d", exit_status);
1445: return exit_status;
1.15 markus 1446: }
1447:
1448: /*********/
1449:
1.77 itojun 1450: static Channel *
1.303 djm 1451: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1452: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1453: {
1.103 deraadt 1454: Channel *c = NULL;
1.289 markus 1455: struct sshbuf *b = NULL;
1.40 markus 1456: char *listen_address, *originator_address;
1.320 djm 1457: u_int listen_port, originator_port;
1.289 markus 1458: int r;
1.40 markus 1459:
1460: /* Get rest of the packet */
1.320 djm 1461: if ((r = sshpkt_get_cstring(ssh, &listen_address, NULL)) != 0 ||
1462: (r = sshpkt_get_u32(ssh, &listen_port)) != 0 ||
1463: (r = sshpkt_get_cstring(ssh, &originator_address, NULL)) != 0 ||
1464: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1465: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1466: fatal_fr(r, "parse packet");
1.40 markus 1467:
1.354 djm 1468: debug_f("listen %s port %d, originator %s port %d",
1.261 millert 1469: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1470:
1.320 djm 1471: if (listen_port > 0xffff)
1.354 djm 1472: error_f("invalid listen port");
1.320 djm 1473: else if (originator_port > 0xffff)
1.354 djm 1474: error_f("invalid originator port");
1.320 djm 1475: else {
1476: c = channel_connect_by_listen_address(ssh,
1477: listen_address, listen_port, "forwarded-tcpip",
1478: originator_address);
1479: }
1.40 markus 1480:
1.289 markus 1481: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1482: if ((b = sshbuf_new()) == NULL) {
1.354 djm 1483: error_f("alloc reply");
1.289 markus 1484: goto out;
1485: }
1486: /* reconstruct and send to muxclient */
1487: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1488: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1489: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1490: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1491: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1492: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1493: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1494: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1495: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1496: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1497: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.354 djm 1498: error_fr(r, "compose for muxclient");
1.289 markus 1499: goto out;
1500: }
1501: }
1502:
1503: out:
1504: sshbuf_free(b);
1.250 djm 1505: free(originator_address);
1506: free(listen_address);
1.40 markus 1507: return c;
1508: }
1509:
1.103 deraadt 1510: static Channel *
1.303 djm 1511: client_request_forwarded_streamlocal(struct ssh *ssh,
1512: const char *request_type, int rchan)
1.261 millert 1513: {
1514: Channel *c = NULL;
1515: char *listen_path;
1.320 djm 1516: int r;
1.261 millert 1517:
1518: /* Get the remote path. */
1.320 djm 1519: if ((r = sshpkt_get_cstring(ssh, &listen_path, NULL)) != 0 ||
1520: (r = sshpkt_get_string(ssh, NULL, NULL)) != 0 || /* reserved */
1521: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1522: fatal_fr(r, "parse packet");
1.261 millert 1523:
1.354 djm 1524: debug_f("request: %s", listen_path);
1.261 millert 1525:
1.303 djm 1526: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1527: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1528: free(listen_path);
1529: return c;
1530: }
1531:
1532: static Channel *
1.303 djm 1533: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1534: {
1535: Channel *c = NULL;
1536: char *originator;
1.321 djm 1537: u_int originator_port;
1.320 djm 1538: int r, sock;
1.40 markus 1539:
1540: if (!options.forward_x11) {
1541: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1542: error("Warning: this is probably a break-in attempt by a "
1543: "malicious server.");
1.221 djm 1544: return NULL;
1545: }
1.274 djm 1546: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1547: verbose("Rejected X11 connection after ForwardX11Timeout "
1548: "expired");
1.40 markus 1549: return NULL;
1550: }
1.320 djm 1551: if ((r = sshpkt_get_cstring(ssh, &originator, NULL)) != 0 ||
1.321 djm 1552: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1.320 djm 1553: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1554: fatal_fr(r, "parse packet");
1.40 markus 1555: /* XXX check permission */
1.321 djm 1556: /* XXX range check originator port? */
1557: debug("client_request_x11: request from %s %u", originator,
1.47 markus 1558: originator_port);
1.250 djm 1559: free(originator);
1.303 djm 1560: sock = x11_connect_display(ssh);
1.67 markus 1561: if (sock < 0)
1562: return NULL;
1.303 djm 1563: c = channel_new(ssh, "x11",
1.67 markus 1564: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1565: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1566: c->force_drain = 1;
1.40 markus 1567: return c;
1568: }
1569:
1.103 deraadt 1570: static Channel *
1.303 djm 1571: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1572: {
1573: Channel *c = NULL;
1.262 djm 1574: int r, sock;
1.40 markus 1575:
1576: if (!options.forward_agent) {
1577: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1578: error("Warning: this is probably a break-in attempt by a "
1579: "malicious server.");
1.40 markus 1580: return NULL;
1581: }
1.330 djm 1582: if (forward_agent_sock_path == NULL) {
1583: r = ssh_get_authentication_socket(&sock);
1584: } else {
1585: r = ssh_get_authentication_socket_path(forward_agent_sock_path, &sock);
1586: }
1587: if (r != 0) {
1.262 djm 1588: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.354 djm 1589: debug_fr(r, "ssh_get_authentication_socket");
1.67 markus 1590: return NULL;
1.262 djm 1591: }
1.303 djm 1592: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1593: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1594: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1595: "authentication agent connection", 1);
1.82 markus 1596: c->force_drain = 1;
1.40 markus 1597: return c;
1.180 djm 1598: }
1599:
1.306 djm 1600: char *
1.303 djm 1601: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1.343 djm 1602: int local_tun, int remote_tun, channel_open_fn *cb, void *cbctx)
1.180 djm 1603: {
1604: Channel *c;
1.320 djm 1605: int r, fd;
1.306 djm 1606: char *ifname = NULL;
1.180 djm 1607:
1608: if (tun_mode == SSH_TUNMODE_NO)
1609: return 0;
1610:
1611: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1612:
1613: /* Open local tunnel device */
1.306 djm 1614: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1615: error("Tunnel device open failed.");
1.306 djm 1616: return NULL;
1.180 djm 1617: }
1.306 djm 1618: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1619:
1.303 djm 1620: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1621: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1622: c->datagram = 1;
1.343 djm 1623:
1624: if (cb != NULL)
1625: channel_register_open_confirm(ssh, c->self, cb, cbctx);
1.180 djm 1626:
1.320 djm 1627: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1628: (r = sshpkt_put_cstring(ssh, "tun@openssh.com")) != 0 ||
1629: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1630: (r = sshpkt_put_u32(ssh, c->local_window_max)) != 0 ||
1631: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1632: (r = sshpkt_put_u32(ssh, tun_mode)) != 0 ||
1633: (r = sshpkt_put_u32(ssh, remote_tun)) != 0 ||
1634: (r = sshpkt_send(ssh)) != 0)
1.321 djm 1635: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.180 djm 1636:
1.306 djm 1637: return ifname;
1.40 markus 1638: }
1639:
1.22 markus 1640: /* XXXX move to generic input handler */
1.264 markus 1641: static int
1.297 markus 1642: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1643: {
1644: Channel *c = NULL;
1.320 djm 1645: char *ctype = NULL;
1646: int r;
1647: u_int rchan;
1648: size_t len;
1649: u_int rmaxpack, rwindow;
1650:
1651: if ((r = sshpkt_get_cstring(ssh, &ctype, &len)) != 0 ||
1652: (r = sshpkt_get_u32(ssh, &rchan)) != 0 ||
1653: (r = sshpkt_get_u32(ssh, &rwindow)) != 0 ||
1654: (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0)
1655: goto out;
1.22 markus 1656:
1.24 markus 1657: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1658: ctype, rchan, rwindow, rmaxpack);
1659:
1.40 markus 1660: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1661: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1662: rmaxpack);
1.261 millert 1663: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1664: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1665: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1666: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1667: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1668: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1669: }
1.289 markus 1670: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1671: debug3("proxied to downstream: %s", ctype);
1672: } else if (c != NULL) {
1.22 markus 1673: debug("confirm %s", ctype);
1674: c->remote_id = rchan;
1.304 djm 1675: c->have_remote_id = 1;
1.22 markus 1676: c->remote_window = rwindow;
1677: c->remote_maxpacket = rmaxpack;
1.69 markus 1678: if (c->type != SSH_CHANNEL_CONNECTING) {
1.320 djm 1679: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1680: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1681: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1682: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1683: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1684: (r = sshpkt_send(ssh)) != 0)
1685: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.69 markus 1686: }
1.22 markus 1687: } else {
1688: debug("failure %s", ctype);
1.320 djm 1689: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
1690: (r = sshpkt_put_u32(ssh, rchan)) != 0 ||
1691: (r = sshpkt_put_u32(ssh, SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED)) != 0 ||
1692: (r = sshpkt_put_cstring(ssh, "open failed")) != 0 ||
1693: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1694: (r = sshpkt_send(ssh)) != 0)
1695: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.22 markus 1696: }
1.320 djm 1697: r = 0;
1698: out:
1.250 djm 1699: free(ctype);
1.320 djm 1700: return r;
1.22 markus 1701: }
1.267 djm 1702:
1.264 markus 1703: static int
1.297 markus 1704: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1705: {
1706: Channel *c = NULL;
1.320 djm 1707: char *rtype = NULL;
1708: u_char reply;
1709: u_int id, exitval;
1710: int r, success = 0;
1711:
1712: if ((r = sshpkt_get_u32(ssh, &id)) != 0)
1713: return r;
1714: if (id <= INT_MAX)
1715: c = channel_lookup(ssh, id);
1.297 markus 1716: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1717: return 0;
1.320 djm 1718: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
1719: (r = sshpkt_get_u8(ssh, &reply)) != 0)
1720: goto out;
1.48 markus 1721:
1.320 djm 1722: debug("client_input_channel_req: channel %u rtype %s reply %d",
1.48 markus 1723: id, rtype, reply);
1724:
1.320 djm 1725: if (c == NULL) {
1.197 djm 1726: error("client_input_channel_req: channel %d: "
1727: "unknown channel", id);
1.193 markus 1728: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1.320 djm 1729: if ((r = sshpkt_get_end(ssh)) != 0)
1730: goto out;
1.303 djm 1731: chan_rcvd_eow(ssh, c);
1.48 markus 1732: } else if (strcmp(rtype, "exit-status") == 0) {
1.320 djm 1733: if ((r = sshpkt_get_u32(ssh, &exitval)) != 0)
1734: goto out;
1.217 djm 1735: if (c->ctl_chan != -1) {
1.303 djm 1736: mux_exit_message(ssh, c, exitval);
1.215 djm 1737: success = 1;
1.320 djm 1738: } else if ((int)id == session_ident) {
1.215 djm 1739: /* Record exit value of local session */
1.123 djm 1740: success = 1;
1741: exit_status = exitval;
1.215 djm 1742: } else {
1.218 djm 1743: /* Probably for a mux channel that has already closed */
1.354 djm 1744: debug_f("no sink for exit-status on channel %d",
1745: id);
1.123 djm 1746: }
1.320 djm 1747: if ((r = sshpkt_get_end(ssh)) != 0)
1748: goto out;
1.48 markus 1749: }
1.259 djm 1750: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1751: if (!c->have_remote_id)
1.354 djm 1752: fatal_f("channel %d: no remote_id", c->self);
1.320 djm 1753: if ((r = sshpkt_start(ssh, success ?
1754: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE)) != 0 ||
1755: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1756: (r = sshpkt_send(ssh)) != 0)
1757: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.48 markus 1758: }
1.320 djm 1759: r = 0;
1760: out:
1.250 djm 1761: free(rtype);
1.320 djm 1762: return r;
1.48 markus 1763: }
1.267 djm 1764:
1.269 djm 1765: struct hostkeys_update_ctx {
1766: /* The hostname and (optionally) IP address string for the server */
1767: char *host_str, *ip_str;
1768:
1769: /*
1770: * Keys received from the server and a flag for each indicating
1771: * whether they already exist in known_hosts.
1.351 djm 1772: * keys_match is filled in by hostkeys_find() and later (for new
1.269 djm 1773: * keys) by client_global_hostkeys_private_confirm().
1774: */
1775: struct sshkey **keys;
1.351 djm 1776: u_int *keys_match; /* mask of HKF_MATCH_* from hostfile.h */
1777: int *keys_verified; /* flag for new keys verified by server */
1778: size_t nkeys, nnew, nincomplete; /* total, new keys, incomplete match */
1.269 djm 1779:
1780: /*
1781: * Keys that are in known_hosts, but were not present in the update
1782: * from the server (i.e. scheduled to be deleted).
1783: * Filled in by hostkeys_find().
1784: */
1785: struct sshkey **old_keys;
1786: size_t nold;
1.347 djm 1787:
1788: /* Various special cases. */
1.350 djm 1789: int complex_hostspec; /* wildcard or manual pattern-list host name */
1.347 djm 1790: int ca_available; /* saw CA key for this host */
1.352 djm 1791: int old_key_seen; /* saw old key with other name/addr */
1.353 djm 1792: int other_name_seen; /* saw key with other name/addr */
1.269 djm 1793: };
1794:
1795: static void
1796: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1797: {
1798: size_t i;
1799:
1800: if (ctx == NULL)
1801: return;
1802: for (i = 0; i < ctx->nkeys; i++)
1803: sshkey_free(ctx->keys[i]);
1804: free(ctx->keys);
1.351 djm 1805: free(ctx->keys_match);
1806: free(ctx->keys_verified);
1.269 djm 1807: for (i = 0; i < ctx->nold; i++)
1808: sshkey_free(ctx->old_keys[i]);
1809: free(ctx->old_keys);
1810: free(ctx->host_str);
1811: free(ctx->ip_str);
1812: free(ctx);
1813: }
1814:
1.350 djm 1815: /*
1816: * Returns non-zero if a known_hosts hostname list is not of a form that
1817: * can be handled by UpdateHostkeys. These include wildcard hostnames and
1818: * hostnames lists that do not follow the form host[,ip].
1819: */
1820: static int
1821: hostspec_is_complex(const char *hosts)
1822: {
1823: char *cp;
1824:
1825: /* wildcard */
1826: if (strchr(hosts, '*') != NULL || strchr(hosts, '?') != NULL)
1827: return 1;
1828: /* single host/ip = ok */
1829: if ((cp = strchr(hosts, ',')) == NULL)
1830: return 0;
1831: /* more than two entries on the line */
1832: if (strchr(cp + 1, ',') != NULL)
1833: return 1;
1834: /* XXX maybe parse cp+1 and ensure it is an IP? */
1835: return 0;
1836: }
1837:
1.352 djm 1838: /* callback to search for ctx->keys in known_hosts */
1.269 djm 1839: static int
1840: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1841: {
1842: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1843: size_t i;
1844: struct sshkey **tmp;
1845:
1.353 djm 1846: if (l->key == NULL)
1.269 djm 1847: return 0;
1.353 djm 1848: if (l->status != HKF_STATUS_MATCHED) {
1849: /* Record if one of the keys appears on a non-matching line */
1850: for (i = 0; i < ctx->nkeys; i++) {
1851: if (sshkey_equal(l->key, ctx->keys[i])) {
1852: ctx->other_name_seen = 1;
1.354 djm 1853: debug3_f("found %s key under different "
1854: "name/addr at %s:%ld",
1.353 djm 1855: sshkey_ssh_name(ctx->keys[i]),
1856: l->path, l->linenum);
1857: return 0;
1858: }
1859: }
1860: return 0;
1861: }
1862: /* Don't proceed if revocation or CA markers are present */
1863: /* XXX relax this */
1864: if (l->marker != MRK_NONE) {
1.354 djm 1865: debug3_f("hostkeys file %s:%ld has CA/revocation marker",
1866: l->path, l->linenum);
1.353 djm 1867: ctx->complex_hostspec = 1;
1868: return 0;
1869: }
1870:
1.355 djm 1871: /* If CheckHostIP is enabled, then check for mismatched hostname/addr */
1872: if (ctx->ip_str != NULL && strchr(l->hosts, ',') != NULL) {
1873: if ((l->match & HKF_MATCH_HOST) == 0) {
1874: /* Record if address matched a different hostname. */
1875: ctx->other_name_seen = 1;
1876: debug3_f("found address %s against different hostname "
1877: "at %s:%ld", ctx->ip_str, l->path, l->linenum);
1878: return 0;
1879: } else if ((l->match & HKF_MATCH_IP) == 0) {
1880: /* Record if hostname matched a different address. */
1881: ctx->other_name_seen = 1;
1882: debug3_f("found hostname %s against different address "
1883: "at %s:%ld", ctx->host_str, l->path, l->linenum);
1884: }
1.353 djm 1885: }
1.269 djm 1886:
1.350 djm 1887: /*
1888: * UpdateHostkeys is skipped for wildcard host names and hostnames
1889: * that contain more than two entries (ssh never writes these).
1890: */
1891: if (hostspec_is_complex(l->hosts)) {
1.354 djm 1892: debug3_f("hostkeys file %s:%ld complex host specification",
1893: l->path, l->linenum);
1.350 djm 1894: ctx->complex_hostspec = 1;
1.347 djm 1895: return 0;
1896: }
1897:
1.269 djm 1898: /* Mark off keys we've already seen for this host */
1899: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 1900: if (!sshkey_equal(l->key, ctx->keys[i]))
1901: continue;
1.354 djm 1902: debug3_f("found %s key at %s:%ld",
1.351 djm 1903: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1904: ctx->keys_match[i] |= l->match;
1905: return 0;
1.269 djm 1906: }
1907: /* This line contained a key that not offered by the server */
1.354 djm 1908: debug3_f("deprecated %s key at %s:%ld", sshkey_ssh_name(l->key),
1909: l->path, l->linenum);
1.299 deraadt 1910: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1911: sizeof(*ctx->old_keys))) == NULL)
1.354 djm 1912: fatal_f("recallocarray failed nold = %zu", ctx->nold);
1.269 djm 1913: ctx->old_keys = tmp;
1914: ctx->old_keys[ctx->nold++] = l->key;
1915: l->key = NULL;
1916:
1917: return 0;
1918: }
1919:
1.352 djm 1920: /* callback to search for ctx->old_keys in known_hosts under other names */
1921: static int
1922: hostkeys_check_old(struct hostkey_foreach_line *l, void *_ctx)
1923: {
1924: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1925: size_t i;
1926: int hashed;
1927:
1928: /* only care about lines that *don't* match the active host spec */
1929: if (l->status == HKF_STATUS_MATCHED || l->key == NULL)
1930: return 0;
1931:
1932: hashed = l->match & (HKF_MATCH_HOST_HASHED|HKF_MATCH_IP_HASHED);
1933: for (i = 0; i < ctx->nold; i++) {
1934: if (!sshkey_equal(l->key, ctx->old_keys[i]))
1935: continue;
1.354 djm 1936: debug3_f("found deprecated %s key at %s:%ld as %s",
1.364 djm 1937: sshkey_ssh_name(ctx->old_keys[i]), l->path, l->linenum,
1.352 djm 1938: hashed ? "[HASHED]" : l->hosts);
1939: ctx->old_key_seen = 1;
1940: break;
1941: }
1942: return 0;
1943: }
1944:
1945: /*
1946: * Check known_hosts files for deprecated keys under other names. Returns 0
1947: * on success or -1 on failure. Updates ctx->old_key_seen if deprecated keys
1948: * exist under names other than the active hostname/IP.
1949: */
1950: static int
1951: check_old_keys_othernames(struct hostkeys_update_ctx *ctx)
1952: {
1953: size_t i;
1954: int r;
1955:
1.354 djm 1956: debug2_f("checking for %zu deprecated keys", ctx->nold);
1.352 djm 1957: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 1958: debug3_f("searching %s for %s / %s",
1.352 djm 1959: options.user_hostfiles[i], ctx->host_str,
1960: ctx->ip_str ? ctx->ip_str : "(none)");
1961: if ((r = hostkeys_foreach(options.user_hostfiles[i],
1962: hostkeys_check_old, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 1963: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.352 djm 1964: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 1965: debug_f("hostkeys file %s does not exist",
1966: options.user_hostfiles[i]);
1.352 djm 1967: continue;
1968: }
1.354 djm 1969: error_fr(r, "hostkeys_foreach failed for %s",
1970: options.user_hostfiles[i]);
1.352 djm 1971: return -1;
1972: }
1973: }
1974: return 0;
1975: }
1976:
1.269 djm 1977: static void
1.337 djm 1978: hostkey_change_preamble(LogLevel loglevel)
1.269 djm 1979: {
1.336 djm 1980: do_log2(loglevel, "The server has updated its host keys.");
1981: do_log2(loglevel, "These changes were verified by the server's "
1982: "existing trusted key.");
1983: }
1984:
1985: static void
1986: update_known_hosts(struct hostkeys_update_ctx *ctx)
1987: {
1988: int r, was_raw = 0, first = 1;
1989: int asking = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK;
1990: LogLevel loglevel = asking ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1.269 djm 1991: char *fp, *response;
1992: size_t i;
1.333 djm 1993: struct stat sb;
1.269 djm 1994:
1995: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 1996: if (!ctx->keys_verified[i])
1.269 djm 1997: continue;
1998: if ((fp = sshkey_fingerprint(ctx->keys[i],
1999: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2000: fatal_f("sshkey_fingerprint failed");
1.336 djm 2001: if (first && asking)
1.337 djm 2002: hostkey_change_preamble(loglevel);
1.269 djm 2003: do_log2(loglevel, "Learned new hostkey: %s %s",
2004: sshkey_type(ctx->keys[i]), fp);
1.336 djm 2005: first = 0;
1.269 djm 2006: free(fp);
2007: }
2008: for (i = 0; i < ctx->nold; i++) {
2009: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2010: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2011: fatal_f("sshkey_fingerprint failed");
1.336 djm 2012: if (first && asking)
1.337 djm 2013: hostkey_change_preamble(loglevel);
1.269 djm 2014: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2015: sshkey_type(ctx->old_keys[i]), fp);
1.336 djm 2016: first = 0;
1.269 djm 2017: free(fp);
2018: }
2019: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2020: if (get_saved_tio() != NULL) {
2021: leave_raw_mode(1);
2022: was_raw = 1;
2023: }
1.269 djm 2024: response = NULL;
2025: for (i = 0; !quit_pending && i < 3; i++) {
2026: free(response);
2027: response = read_passphrase("Accept updated hostkeys? "
2028: "(yes/no): ", RP_ECHO);
2029: if (strcasecmp(response, "yes") == 0)
2030: break;
2031: else if (quit_pending || response == NULL ||
2032: strcasecmp(response, "no") == 0) {
2033: options.update_hostkeys = 0;
2034: break;
2035: } else {
2036: do_log2(loglevel, "Please enter "
2037: "\"yes\" or \"no\"");
2038: }
2039: }
2040: if (quit_pending || i >= 3 || response == NULL)
2041: options.update_hostkeys = 0;
2042: free(response);
1.271 djm 2043: if (was_raw)
2044: enter_raw_mode(1);
1.269 djm 2045: }
1.333 djm 2046: if (options.update_hostkeys == 0)
2047: return;
1.269 djm 2048: /*
2049: * Now that all the keys are verified, we can go ahead and replace
2050: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2051: * cancel the operation).
2052: */
1.333 djm 2053: for (i = 0; i < options.num_user_hostfiles; i++) {
2054: /*
2055: * NB. keys are only added to hostfiles[0], for the rest we
2056: * just delete the hostname entries.
2057: */
2058: if (stat(options.user_hostfiles[i], &sb) != 0) {
2059: if (errno == ENOENT) {
1.354 djm 2060: debug_f("known hosts file %s does not "
2061: "exist", options.user_hostfiles[i]);
1.333 djm 2062: } else {
1.354 djm 2063: error_f("known hosts file %s "
2064: "inaccessible: %s",
2065: options.user_hostfiles[i], strerror(errno));
1.333 djm 2066: }
2067: continue;
2068: }
2069: if ((r = hostfile_replace_entries(options.user_hostfiles[i],
2070: ctx->host_str, ctx->ip_str,
2071: i == 0 ? ctx->keys : NULL, i == 0 ? ctx->nkeys : 0,
2072: options.hash_known_hosts, 0,
2073: options.fingerprint_hash)) != 0) {
1.354 djm 2074: error_fr(r, "hostfile_replace_entries failed for %s",
2075: options.user_hostfiles[i]);
1.333 djm 2076: }
2077: }
1.269 djm 2078: }
2079:
2080: static void
1.303 djm 2081: client_global_hostkeys_private_confirm(struct ssh *ssh, int type,
2082: u_int32_t seq, void *_ctx)
1.269 djm 2083: {
2084: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2085: size_t i, ndone;
2086: struct sshbuf *signdata;
1.309 djm 2087: int r, kexsigtype, use_kexsigtype;
1.269 djm 2088: const u_char *sig;
2089: size_t siglen;
2090:
2091: if (ctx->nnew == 0)
1.354 djm 2092: fatal_f("ctx->nnew == 0"); /* sanity */
1.269 djm 2093: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2094: error("Server failed to confirm ownership of "
2095: "private host keys");
2096: hostkeys_update_ctx_free(ctx);
2097: return;
2098: }
1.309 djm 2099: kexsigtype = sshkey_type_plain(
2100: sshkey_type_from_name(ssh->kex->hostkey_alg));
2101:
1.269 djm 2102: if ((signdata = sshbuf_new()) == NULL)
1.354 djm 2103: fatal_f("sshbuf_new failed");
1.269 djm 2104: /*
2105: * Expect a signature for each of the ctx->nnew private keys we
2106: * haven't seen before. They will be in the same order as the
1.351 djm 2107: * ctx->keys where the corresponding ctx->keys_match[i] == 0.
1.269 djm 2108: */
2109: for (ndone = i = 0; i < ctx->nkeys; i++) {
1.351 djm 2110: if (ctx->keys_match[i])
1.269 djm 2111: continue;
2112: /* Prepare data to be signed: session ID, unique string, key */
2113: sshbuf_reset(signdata);
1.270 djm 2114: if ( (r = sshbuf_put_cstring(signdata,
2115: "hostkeys-prove-00@openssh.com")) != 0 ||
1.358 djm 2116: (r = sshbuf_put_stringb(signdata,
2117: ssh->kex->session_id)) != 0 ||
1.269 djm 2118: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1.354 djm 2119: fatal_fr(r, "compose signdata");
1.269 djm 2120: /* Extract and verify signature */
2121: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1.354 djm 2122: error_fr(r, "parse sig");
1.269 djm 2123: goto out;
2124: }
1.309 djm 2125: /*
2126: * For RSA keys, prefer to use the signature type negotiated
2127: * during KEX to the default (SHA1).
2128: */
2129: use_kexsigtype = kexsigtype == KEY_RSA &&
2130: sshkey_type_plain(ctx->keys[i]->type) == KEY_RSA;
1.361 djm 2131: debug3_f("verify %s key %zu using %s sigalg",
2132: sshkey_type(ctx->keys[i]), i,
1.362 dtucker 2133: use_kexsigtype ? ssh->kex->hostkey_alg : "default");
1.269 djm 2134: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 2135: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.329 djm 2136: use_kexsigtype ? ssh->kex->hostkey_alg : NULL, 0,
2137: NULL)) != 0) {
1.361 djm 2138: error_fr(r, "server gave bad signature for %s key %zu",
1.354 djm 2139: sshkey_type(ctx->keys[i]), i);
1.269 djm 2140: goto out;
2141: }
2142: /* Key is good. Mark it as 'seen' */
1.351 djm 2143: ctx->keys_verified[i] = 1;
1.269 djm 2144: ndone++;
2145: }
1.354 djm 2146: /* Shouldn't happen */
1.269 djm 2147: if (ndone != ctx->nnew)
1.354 djm 2148: fatal_f("ndone != ctx->nnew (%zu / %zu)", ndone, ctx->nnew);
1.320 djm 2149: if ((r = sshpkt_get_end(ssh)) != 0) {
1.354 djm 2150: error_f("protocol error");
1.320 djm 2151: goto out;
2152: }
1.269 djm 2153:
2154: /* Make the edits to known_hosts */
2155: update_known_hosts(ctx);
2156: out:
2157: hostkeys_update_ctx_free(ctx);
2158: }
2159:
1.267 djm 2160: /*
1.291 djm 2161: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
2162: * Made slightly less trivial by the multiple RSA signature algorithm names.
2163: */
2164: static int
2165: key_accepted_by_hostkeyalgs(const struct sshkey *key)
2166: {
2167: const char *ktype = sshkey_ssh_name(key);
1.331 dtucker 2168: const char *hostkeyalgs = options.hostkeyalgorithms;
1.291 djm 2169:
2170: if (key == NULL || key->type == KEY_UNSPEC)
2171: return 0;
2172: if (key->type == KEY_RSA &&
2173: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
2174: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
2175: return 1;
2176: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
2177: }
2178:
2179: /*
1.270 djm 2180: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2181: * the server's hostkeys. The keys are checked against the user's
2182: * HostkeyAlgorithms preference before they are accepted.
2183: */
2184: static int
1.321 djm 2185: client_input_hostkeys(struct ssh *ssh)
1.267 djm 2186: {
2187: const u_char *blob = NULL;
1.269 djm 2188: size_t i, len = 0;
1.267 djm 2189: struct sshbuf *buf = NULL;
1.269 djm 2190: struct sshkey *key = NULL, **tmp;
2191: int r;
2192: char *fp;
1.267 djm 2193: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2194: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2195: struct hostkeys_update_ctx *ctx = NULL;
1.351 djm 2196: u_int want;
1.267 djm 2197:
2198: if (hostkeys_seen)
1.354 djm 2199: fatal_f("server already sent hostkeys");
1.269 djm 2200: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2201: options.batch_mode)
2202: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2203: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2204: return 1;
1.272 djm 2205:
2206: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2207: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2208: sshkey_free(key);
2209: key = NULL;
1.269 djm 2210: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
1.354 djm 2211: error_fr(r, "parse key");
1.269 djm 2212: goto out;
2213: }
1.270 djm 2214: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
1.354 djm 2215: do_log2_fr(r, r == SSH_ERR_KEY_TYPE_UNKNOWN ?
1.335 djm 2216: SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR,
1.354 djm 2217: "convert key");
1.335 djm 2218: continue;
1.270 djm 2219: }
1.267 djm 2220: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2221: SSH_FP_DEFAULT);
1.354 djm 2222: debug3_f("received %s key %s", sshkey_type(key), fp);
1.267 djm 2223: free(fp);
1.275 markus 2224:
1.291 djm 2225: if (!key_accepted_by_hostkeyalgs(key)) {
1.354 djm 2226: debug3_f("%s key not permitted by "
2227: "HostkeyAlgorithms", sshkey_ssh_name(key));
1.267 djm 2228: continue;
2229: }
1.269 djm 2230: /* Skip certs */
2231: if (sshkey_is_cert(key)) {
1.354 djm 2232: debug3_f("%s key is a certificate; skipping",
2233: sshkey_ssh_name(key));
1.269 djm 2234: continue;
2235: }
2236: /* Ensure keys are unique */
2237: for (i = 0; i < ctx->nkeys; i++) {
2238: if (sshkey_equal(key, ctx->keys[i])) {
1.354 djm 2239: error_f("received duplicated %s host key",
2240: sshkey_ssh_name(key));
1.269 djm 2241: goto out;
2242: }
2243: }
2244: /* Key is good, record it */
1.299 deraadt 2245: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2246: sizeof(*ctx->keys))) == NULL)
1.354 djm 2247: fatal_f("recallocarray failed nkeys = %zu",
2248: ctx->nkeys);
1.269 djm 2249: ctx->keys = tmp;
2250: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2251: key = NULL;
2252: }
2253:
1.269 djm 2254: if (ctx->nkeys == 0) {
1.354 djm 2255: debug_f("server sent no hostkeys");
1.267 djm 2256: goto out;
2257: }
1.270 djm 2258:
1.351 djm 2259: if ((ctx->keys_match = calloc(ctx->nkeys,
2260: sizeof(*ctx->keys_match))) == NULL ||
2261: (ctx->keys_verified = calloc(ctx->nkeys,
2262: sizeof(*ctx->keys_verified))) == NULL)
1.354 djm 2263: fatal_f("calloc failed");
1.267 djm 2264:
1.268 djm 2265: get_hostfile_hostname_ipaddr(host,
2266: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2267: options.port, &ctx->host_str,
2268: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2269:
1.269 djm 2270: /* Find which keys we already know about. */
1.333 djm 2271: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2272: debug_f("searching %s for %s / %s",
1.339 dtucker 2273: options.user_hostfiles[i], ctx->host_str,
1.340 dtucker 2274: ctx->ip_str ? ctx->ip_str : "(none)");
1.333 djm 2275: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2276: hostkeys_find, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2277: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.333 djm 2278: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2279: debug_f("hostkeys file %s does not exist",
2280: options.user_hostfiles[i]);
1.333 djm 2281: continue;
2282: }
1.354 djm 2283: error_fr(r, "hostkeys_foreach failed for %s",
2284: options.user_hostfiles[i]);
1.333 djm 2285: goto out;
2286: }
1.267 djm 2287: }
2288:
1.269 djm 2289: /* Figure out if we have any new keys to add */
1.351 djm 2290: ctx->nnew = ctx->nincomplete = 0;
2291: want = HKF_MATCH_HOST | ( options.check_host_ip ? HKF_MATCH_IP : 0);
1.269 djm 2292: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2293: if (ctx->keys_match[i] == 0)
1.269 djm 2294: ctx->nnew++;
1.351 djm 2295: if ((ctx->keys_match[i] & want) != want)
2296: ctx->nincomplete++;
1.269 djm 2297: }
2298:
1.354 djm 2299: debug3_f("%zu server keys: %zu new, %zu retained, "
2300: "%zu incomplete match. %zu to remove", ctx->nkeys, ctx->nnew,
2301: ctx->nkeys - ctx->nnew - ctx->nincomplete,
1.351 djm 2302: ctx->nincomplete, ctx->nold);
1.269 djm 2303:
1.353 djm 2304: if (ctx->nnew == 0 && ctx->nold == 0) {
1.354 djm 2305: debug_f("no new or deprecated keys from server");
1.353 djm 2306: goto out;
2307: }
2308:
2309: /* Various reasons why we cannot proceed with the update */
2310: if (ctx->complex_hostspec) {
1.354 djm 2311: debug_f("CA/revocation marker, manual host list or wildcard "
2312: "host pattern found, skipping UserKnownHostsFile update");
1.353 djm 2313: goto out;
2314: }
2315: if (ctx->other_name_seen) {
1.354 djm 2316: debug_f("host key found matching a different name/address, "
2317: "skipping UserKnownHostsFile update");
1.347 djm 2318: goto out;
1.352 djm 2319: }
2320: /*
2321: * If removing keys, check whether they appear under different
2322: * names/addresses and refuse to proceed if they do. This avoids
2323: * cases such as hosts with multiple names becoming inconsistent
2324: * with regards to CheckHostIP entries.
2325: * XXX UpdateHostkeys=force to override this (and other) checks?
2326: */
2327: if (ctx->nold != 0) {
2328: if (check_old_keys_othernames(ctx) != 0)
2329: goto out; /* error already logged */
2330: if (ctx->old_key_seen) {
1.354 djm 2331: debug_f("key(s) for %s%s%s exist under other names; "
2332: "skipping UserKnownHostsFile update",
1.352 djm 2333: ctx->host_str, ctx->ip_str == NULL ? "" : ",",
2334: ctx->ip_str == NULL ? "" : ctx->ip_str);
2335: goto out;
2336: }
2337: }
2338:
1.353 djm 2339: if (ctx->nnew == 0) {
1.351 djm 2340: /*
2341: * We have some keys to remove or fix matching for.
2342: * We can proceed to do this without requiring a fresh proof
2343: * from the server.
2344: */
1.269 djm 2345: update_known_hosts(ctx);
1.353 djm 2346: goto out;
2347: }
2348: /*
2349: * We have received previously-unseen keys from the server.
2350: * Ask the server to confirm ownership of the private halves.
2351: */
1.354 djm 2352: debug3_f("asking server to prove ownership for %zu keys", ctx->nnew);
1.353 djm 2353: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2354: (r = sshpkt_put_cstring(ssh,
2355: "hostkeys-prove-00@openssh.com")) != 0 ||
2356: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
1.354 djm 2357: fatal_fr(r, "prepare hostkeys-prove");
1.353 djm 2358: if ((buf = sshbuf_new()) == NULL)
1.354 djm 2359: fatal_f("sshbuf_new");
1.353 djm 2360: for (i = 0; i < ctx->nkeys; i++) {
2361: if (ctx->keys_match[i])
2362: continue;
2363: sshbuf_reset(buf);
2364: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0 ||
1.354 djm 2365: (r = sshpkt_put_stringb(ssh, buf)) != 0)
2366: fatal_fr(r, "assemble hostkeys-prove");
1.269 djm 2367: }
1.353 djm 2368: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2369: fatal_fr(r, "send hostkeys-prove");
1.353 djm 2370: client_register_global_confirm(
2371: client_global_hostkeys_private_confirm, ctx);
2372: ctx = NULL; /* will be freed in callback */
1.269 djm 2373:
1.267 djm 2374: /* Success */
2375: out:
1.269 djm 2376: hostkeys_update_ctx_free(ctx);
1.267 djm 2377: sshkey_free(key);
2378: sshbuf_free(buf);
1.269 djm 2379: /*
2380: * NB. Return success for all cases. The server doesn't need to know
2381: * what the client does with its hosts file.
2382: */
2383: return 1;
1.267 djm 2384: }
2385:
1.264 markus 2386: static int
1.297 markus 2387: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2388: {
2389: char *rtype;
1.320 djm 2390: u_char want_reply;
2391: int r, success = 0;
1.95 markus 2392:
1.320 djm 2393: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
2394: (r = sshpkt_get_u8(ssh, &want_reply)) != 0)
2395: goto out;
1.117 markus 2396: debug("client_input_global_request: rtype %s want_reply %d",
2397: rtype, want_reply);
1.270 djm 2398: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.321 djm 2399: success = client_input_hostkeys(ssh);
1.95 markus 2400: if (want_reply) {
1.320 djm 2401: if ((r = sshpkt_start(ssh, success ? SSH2_MSG_REQUEST_SUCCESS :
2402: SSH2_MSG_REQUEST_FAILURE)) != 0 ||
2403: (r = sshpkt_send(ssh)) != 0 ||
2404: (r = ssh_packet_write_wait(ssh)) != 0)
2405: goto out;
1.95 markus 2406: }
1.320 djm 2407: r = 0;
2408: out:
1.250 djm 2409: free(rtype);
1.320 djm 2410: return r;
1.95 markus 2411: }
1.22 markus 2412:
1.354 djm 2413: static void
2414: client_send_env(struct ssh *ssh, int id, const char *name, const char *val)
2415: {
2416: int r;
2417:
2418: debug("channel %d: setting env %s = \"%s\"", id, name, val);
2419: channel_request_start(ssh, id, "env", 0);
2420: if ((r = sshpkt_put_cstring(ssh, name)) != 0 ||
2421: (r = sshpkt_put_cstring(ssh, val)) != 0 ||
2422: (r = sshpkt_send(ssh)) != 0)
2423: fatal_fr(r, "send setenv");
2424: }
2425:
1.123 djm 2426: void
1.303 djm 2427: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.315 markus 2428: const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd,
2429: char **env)
1.123 djm 2430: {
1.320 djm 2431: int i, j, matched, len, r;
1.313 djm 2432: char *name, *val;
1.132 djm 2433: Channel *c = NULL;
1.123 djm 2434:
1.354 djm 2435: debug2_f("id %d", id);
1.123 djm 2436:
1.303 djm 2437: if ((c = channel_lookup(ssh, id)) == NULL)
1.354 djm 2438: fatal_f("channel %d: unknown channel", id);
1.224 djm 2439:
1.320 djm 2440: ssh_packet_set_interactive(ssh, want_tty,
1.224 djm 2441: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2442:
1.123 djm 2443: if (want_tty) {
2444: struct winsize ws;
2445:
2446: /* Store window size in the packet. */
1.326 deraadt 2447: if (ioctl(in_fd, TIOCGWINSZ, &ws) == -1)
1.123 djm 2448: memset(&ws, 0, sizeof(ws));
2449:
1.303 djm 2450: channel_request_start(ssh, id, "pty-req", 1);
2451: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.320 djm 2452: if ((r = sshpkt_put_cstring(ssh, term != NULL ? term : ""))
2453: != 0 ||
2454: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
2455: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
2456: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
2457: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0)
1.354 djm 2458: fatal_fr(r, "build pty-req");
1.194 djm 2459: if (tiop == NULL)
2460: tiop = get_saved_tio();
1.316 markus 2461: ssh_tty_make_modes(ssh, -1, tiop);
1.320 djm 2462: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2463: fatal_fr(r, "send pty-req");
1.123 djm 2464: /* XXX wait for reply */
1.132 djm 2465: c->client_tty = 1;
1.123 djm 2466: }
2467:
2468: /* Transfer any environment variables from client to server */
1.126 djm 2469: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2470: debug("Sending environment.");
1.126 djm 2471: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2472: /* Split */
1.126 djm 2473: name = xstrdup(env[i]);
1.123 djm 2474: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2475: free(name);
1.123 djm 2476: continue;
2477: }
2478: *val++ = '\0';
2479:
2480: matched = 0;
2481: for (j = 0; j < options.num_send_env; j++) {
2482: if (match_pattern(name, options.send_env[j])) {
2483: matched = 1;
2484: break;
2485: }
2486: }
2487: if (!matched) {
2488: debug3("Ignored env %s", name);
1.250 djm 2489: free(name);
1.123 djm 2490: continue;
2491: }
1.354 djm 2492: client_send_env(ssh, id, name, val);
1.250 djm 2493: free(name);
1.123 djm 2494: }
1.313 djm 2495: }
2496: for (i = 0; i < options.num_setenv; i++) {
2497: /* Split */
2498: name = xstrdup(options.setenv[i]);
2499: if ((val = strchr(name, '=')) == NULL) {
2500: free(name);
2501: continue;
2502: }
2503: *val++ = '\0';
1.354 djm 2504: client_send_env(ssh, id, name, val);
1.313 djm 2505: free(name);
1.123 djm 2506: }
2507:
1.315 markus 2508: len = sshbuf_len(cmd);
1.123 djm 2509: if (len > 0) {
2510: if (len > 900)
2511: len = 900;
2512: if (want_subsystem) {
1.190 djm 2513: debug("Sending subsystem: %.*s",
1.315 markus 2514: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2515: channel_request_start(ssh, id, "subsystem", 1);
2516: client_expect_confirm(ssh, id, "subsystem",
2517: CONFIRM_CLOSE);
1.123 djm 2518: } else {
1.190 djm 2519: debug("Sending command: %.*s",
1.315 markus 2520: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2521: channel_request_start(ssh, id, "exec", 1);
2522: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2523: }
1.320 djm 2524: if ((r = sshpkt_put_stringb(ssh, cmd)) != 0 ||
2525: (r = sshpkt_send(ssh)) != 0)
1.354 djm 2526: fatal_fr(r, "send command");
1.123 djm 2527: } else {
1.303 djm 2528: channel_request_start(ssh, id, "shell", 1);
2529: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.354 djm 2530: if ((r = sshpkt_send(ssh)) != 0)
2531: fatal_fr(r, "send shell");
1.123 djm 2532: }
2533: }
2534:
1.77 itojun 2535: static void
1.321 djm 2536: client_init_dispatch(struct ssh *ssh)
1.16 markus 2537: {
1.321 djm 2538: ssh_dispatch_init(ssh, &dispatch_protocol_error);
1.100 markus 2539:
1.321 djm 2540: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2541: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2542: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2543: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2544: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2545: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2546: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2547: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2548: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2549: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2550: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2551: ssh_dispatch_set(ssh, SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2552:
2553: /* rekeying */
1.321 djm 2554: ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2555:
2556: /* global request reply messages */
1.321 djm 2557: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2558: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2559: }
2560:
2561: void
2562: client_stop_mux(void)
2563: {
2564: if (options.control_path != NULL && muxserver_sock != -1)
2565: unlink(options.control_path);
2566: /*
1.247 dtucker 2567: * If we are in persist mode, or don't have a shell, signal that we
2568: * should close when all active channels are closed.
1.232 djm 2569: */
1.366 djm 2570: if (options.control_persist || options.session_type == SESSION_TYPE_NONE) {
1.232 djm 2571: session_closed = 1;
1.235 djm 2572: setproctitle("[stopped mux]");
2573: }
1.113 markus 2574: }
2575:
2576: /* client specific fatal cleanup */
2577: void
1.114 markus 2578: cleanup_exit(int i)
1.113 markus 2579: {
1.233 djm 2580: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.192 djm 2581: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2582: unlink(options.control_path);
1.223 djm 2583: ssh_kill_proxy_command();
1.114 markus 2584: _exit(i);
1.1 deraadt 2585: }
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