Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.368
1.368 ! djm 1: /* $OpenBSD: clientloop.c,v 1.367 2021/07/16 09:00:23 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:
1.286 djm 111: /* Flag indicating that ssh should daemonise after authentication is complete */
112: extern int fork_after_authentication_flag;
113:
1.123 djm 114: /* Control socket */
1.217 djm 115: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 116:
1.13 markus 117: /*
118: * Name of the host we are connecting to. This is the name given on the
1.324 jmc 119: * command line, or the Hostname specified for the user-supplied name in a
1.13 markus 120: * configuration file.
121: */
1.1 deraadt 122: extern char *host;
123:
1.13 markus 124: /*
1.330 djm 125: * If this field is not NULL, the ForwardAgent socket is this path and different
126: * instead of SSH_AUTH_SOCK.
127: */
128: extern char *forward_agent_sock_path;
129:
130: /*
1.13 markus 131: * Flag to indicate that we have received a window change signal which has
132: * not yet been processed. This will cause a message indicating the new
133: * window size to be sent to the server a little later. This is volatile
134: * because this is updated in a signal handler.
135: */
1.88 markus 136: static volatile sig_atomic_t received_window_change_signal = 0;
137: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 138:
1.222 djm 139: /* Time when backgrounded control master using ControlPersist should exit */
140: static time_t control_persist_exit_time = 0;
141:
1.1 deraadt 142: /* Common data for the client loop code. */
1.217 djm 143: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.11 markus 144: static int last_was_cr; /* Last character was a newline. */
1.197 djm 145: static int exit_status; /* Used to store the command exit status. */
1.315 markus 146: static struct sshbuf *stderr_buffer; /* Used for final exit message. */
1.11 markus 147: static int connection_in; /* Connection to server (input). */
148: static int connection_out; /* Connection to server (output). */
1.56 markus 149: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 150: static int session_closed; /* In SSH2: login session closed. */
1.274 djm 151: static u_int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.345 dtucker 152: static time_t server_alive_time; /* Time to do server_alive_check */
1.1 deraadt 153:
1.321 djm 154: static void client_init_dispatch(struct ssh *ssh);
1.16 markus 155: int session_ident = -1;
156:
1.195 djm 157: /* Track escape per proto2 channel */
158: struct escape_filter_ctx {
159: int escape_pending;
160: int escape_char;
161: };
162:
163: /* Context for channel confirmation replies */
1.190 djm 164: struct channel_reply_ctx {
165: const char *request_type;
1.234 djm 166: int id;
167: enum confirm_action action;
1.190 djm 168: };
169:
1.196 djm 170: /* Global request success/failure callbacks */
1.303 djm 171: /* XXX move to struct ssh? */
1.196 djm 172: struct global_confirm {
173: TAILQ_ENTRY(global_confirm) entry;
174: global_confirm_cb *cb;
175: void *ctx;
176: int ref_count;
177: };
178: TAILQ_HEAD(global_confirms, global_confirm);
179: static struct global_confirms global_confirms =
180: TAILQ_HEAD_INITIALIZER(global_confirms);
181:
1.315 markus 182: void ssh_process_session2_setup(int, int, int, struct sshbuf *);
1.123 djm 183:
1.13 markus 184: /*
185: * Signal handler for the window change signal (SIGWINCH). This just sets a
186: * flag indicating that the window has changed.
187: */
1.157 deraadt 188: /*ARGSUSED */
1.77 itojun 189: static void
1.11 markus 190: window_change_handler(int sig)
1.1 deraadt 191: {
1.11 markus 192: received_window_change_signal = 1;
1.1 deraadt 193: }
194:
1.13 markus 195: /*
196: * Signal handler for signals that cause the program to terminate. These
197: * signals must be trapped to restore terminal modes.
198: */
1.157 deraadt 199: /*ARGSUSED */
1.77 itojun 200: static void
1.11 markus 201: signal_handler(int sig)
1.1 deraadt 202: {
1.75 markus 203: received_signal = sig;
204: quit_pending = 1;
1.1 deraadt 205: }
206:
1.13 markus 207: /*
1.222 djm 208: * Sets control_persist_exit_time to the absolute time when the
209: * backgrounded control master should exit due to expiry of the
210: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
211: * control master process, or if there is no ControlPersist timeout.
212: */
213: static void
1.303 djm 214: set_control_persist_exit_time(struct ssh *ssh)
1.222 djm 215: {
216: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 217: || options.control_persist_timeout == 0) {
1.222 djm 218: /* not using a ControlPersist timeout */
219: control_persist_exit_time = 0;
1.303 djm 220: } else if (channel_still_open(ssh)) {
1.222 djm 221: /* some client connections are still open */
222: if (control_persist_exit_time > 0)
1.354 djm 223: debug2_f("cancel scheduled exit");
1.222 djm 224: control_persist_exit_time = 0;
225: } else if (control_persist_exit_time <= 0) {
226: /* a client connection has recently closed */
1.251 dtucker 227: control_persist_exit_time = monotime() +
1.222 djm 228: (time_t)options.control_persist_timeout;
1.354 djm 229: debug2_f("schedule exit in %d seconds",
1.222 djm 230: options.control_persist_timeout);
231: }
232: /* else we are already counting down to the timeout */
233: }
234:
1.238 dtucker 235: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
236: static int
237: client_x11_display_valid(const char *display)
238: {
239: size_t i, dlen;
240:
1.279 djm 241: if (display == NULL)
242: return 0;
243:
1.238 dtucker 244: dlen = strlen(display);
245: for (i = 0; i < dlen; i++) {
1.256 deraadt 246: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 247: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
248: debug("Invalid character '%c' in DISPLAY", display[i]);
249: return 0;
250: }
251: }
252: return 1;
253: }
254:
1.274 djm 255: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
256: #define X11_TIMEOUT_SLACK 60
1.279 djm 257: int
1.303 djm 258: client_x11_get_proto(struct ssh *ssh, const char *display,
259: const char *xauth_path, u_int trusted, u_int timeout,
260: char **_proto, char **_data)
1.138 djm 261: {
1.318 djm 262: char *cmd, line[512], xdisplay[512];
1.279 djm 263: char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
1.138 djm 264: static char proto[512], data[512];
265: FILE *f;
1.288 tedu 266: int got_data = 0, generated = 0, do_unlink = 0, r;
1.138 djm 267: struct stat st;
1.274 djm 268: u_int now, x11_timeout_real;
1.138 djm 269:
270: *_proto = proto;
271: *_data = data;
1.279 djm 272: proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
1.138 djm 273:
1.279 djm 274: if (!client_x11_display_valid(display)) {
1.283 millert 275: if (display != NULL)
276: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
277: display);
1.279 djm 278: return -1;
279: }
280: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
1.138 djm 281: debug("No xauth program.");
1.279 djm 282: xauth_path = NULL;
283: }
284:
285: if (xauth_path != NULL) {
1.138 djm 286: /*
287: * Handle FamilyLocal case where $DISPLAY does
288: * not match an authorization entry. For this we
289: * just try "xauth list unix:displaynum.screennum".
290: * XXX: "localhost" match to determine FamilyLocal
291: * is not perfect.
292: */
293: if (strncmp(display, "localhost:", 10) == 0) {
1.279 djm 294: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
295: display + 10)) < 0 ||
296: (size_t)r >= sizeof(xdisplay)) {
1.354 djm 297: error_f("display name too long");
1.279 djm 298: return -1;
299: }
1.138 djm 300: display = xdisplay;
301: }
302: if (trusted == 0) {
1.274 djm 303: /*
1.279 djm 304: * Generate an untrusted X11 auth cookie.
305: *
1.274 djm 306: * The authentication cookie should briefly outlive
307: * ssh's willingness to forward X11 connections to
308: * avoid nasty fail-open behaviour in the X server.
309: */
1.279 djm 310: mktemp_proto(xauthdir, sizeof(xauthdir));
311: if (mkdtemp(xauthdir) == NULL) {
1.354 djm 312: error_f("mkdtemp: %s", strerror(errno));
1.279 djm 313: return -1;
314: }
315: do_unlink = 1;
316: if ((r = snprintf(xauthfile, sizeof(xauthfile),
317: "%s/xauthfile", xauthdir)) < 0 ||
318: (size_t)r >= sizeof(xauthfile)) {
1.354 djm 319: error_f("xauthfile path too long");
1.279 djm 320: rmdir(xauthdir);
321: return -1;
322: }
323:
1.318 djm 324: if (timeout == 0) {
325: /* auth doesn't time out */
326: xasprintf(&cmd, "%s -f %s generate %s %s "
327: "untrusted 2>%s",
328: xauth_path, xauthfile, display,
329: SSH_X11_PROTO, _PATH_DEVNULL);
330: } else {
331: /* Add some slack to requested expiry */
332: if (timeout < UINT_MAX - X11_TIMEOUT_SLACK)
333: x11_timeout_real = timeout +
334: X11_TIMEOUT_SLACK;
335: else {
336: /* Don't overflow on long timeouts */
337: x11_timeout_real = UINT_MAX;
338: }
339: xasprintf(&cmd, "%s -f %s generate %s %s "
340: "untrusted timeout %u 2>%s",
341: xauth_path, xauthfile, display,
342: SSH_X11_PROTO, x11_timeout_real,
343: _PATH_DEVNULL);
344: }
1.354 djm 345: debug2_f("xauth command: %s", cmd);
1.318 djm 346:
347: if (timeout != 0 && x11_refuse_time == 0) {
1.279 djm 348: now = monotime() + 1;
349: if (UINT_MAX - timeout < now)
350: x11_refuse_time = UINT_MAX;
351: else
352: x11_refuse_time = now + timeout;
1.303 djm 353: channel_set_x11_refuse_time(ssh,
354: x11_refuse_time);
1.138 djm 355: }
1.279 djm 356: if (system(cmd) == 0)
357: generated = 1;
1.318 djm 358: free(cmd);
1.138 djm 359: }
1.181 markus 360:
361: /*
362: * When in untrusted mode, we read the cookie only if it was
363: * successfully generated as an untrusted one in the step
364: * above.
365: */
366: if (trusted || generated) {
1.318 djm 367: xasprintf(&cmd,
1.181 markus 368: "%s %s%s list %s 2>" _PATH_DEVNULL,
369: xauth_path,
370: generated ? "-f " : "" ,
371: generated ? xauthfile : "",
372: display);
373: debug2("x11_get_proto: %s", cmd);
374: f = popen(cmd, "r");
375: if (f && fgets(line, sizeof(line), f) &&
376: sscanf(line, "%*s %511s %511s", proto, data) == 2)
377: got_data = 1;
378: if (f)
379: pclose(f);
1.318 djm 380: free(cmd);
1.279 djm 381: }
1.138 djm 382: }
383:
384: if (do_unlink) {
385: unlink(xauthfile);
386: rmdir(xauthdir);
387: }
388:
1.279 djm 389: /* Don't fall back to fake X11 data for untrusted forwarding */
390: if (!trusted && !got_data) {
391: error("Warning: untrusted X11 forwarding setup failed: "
392: "xauth key data not generated");
393: return -1;
394: }
395:
1.138 djm 396: /*
397: * If we didn't get authentication data, just make up some
398: * data. The forwarding code will check the validity of the
399: * response anyway, and substitute this data. The X11
400: * server, however, will ignore this fake data and use
401: * whatever authentication mechanisms it was using otherwise
402: * for the local connection.
403: */
404: if (!got_data) {
1.288 tedu 405: u_int8_t rnd[16];
406: u_int i;
1.138 djm 407:
408: logit("Warning: No xauth data; "
409: "using fake authentication data for X11 forwarding.");
410: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.288 tedu 411: arc4random_buf(rnd, sizeof(rnd));
412: for (i = 0; i < sizeof(rnd); i++) {
1.138 djm 413: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.288 tedu 414: rnd[i]);
1.138 djm 415: }
416: }
1.279 djm 417:
418: return 0;
1.1 deraadt 419: }
420:
1.13 markus 421: /*
422: * Checks if the client window has changed, and sends a packet about it to
423: * the server if so. The actual change is detected elsewhere (by a software
424: * interrupt on Unix); this just checks the flag and sends a message if
425: * appropriate.
426: */
1.1 deraadt 427:
1.77 itojun 428: static void
1.303 djm 429: client_check_window_change(struct ssh *ssh)
1.1 deraadt 430: {
1.292 djm 431: if (!received_window_change_signal)
1.16 markus 432: return;
433: received_window_change_signal = 0;
1.354 djm 434: debug2_f("changed");
1.303 djm 435: channel_send_window_changes(ssh);
1.1 deraadt 436: }
437:
1.264 markus 438: static int
1.297 markus 439: client_global_request_reply(int type, u_int32_t seq, struct ssh *ssh)
1.117 markus 440: {
1.196 djm 441: struct global_confirm *gc;
442:
443: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 444: return 0;
1.196 djm 445: if (gc->cb != NULL)
1.303 djm 446: gc->cb(ssh, type, seq, gc->ctx);
1.196 djm 447: if (--gc->ref_count <= 0) {
448: TAILQ_REMOVE(&global_confirms, gc, entry);
1.342 jsg 449: freezero(gc, sizeof(*gc));
1.196 djm 450: }
451:
1.320 djm 452: ssh_packet_set_alive_timeouts(ssh, 0);
1.264 markus 453: return 0;
1.117 markus 454: }
455:
456: static void
1.345 dtucker 457: schedule_server_alive_check(void)
458: {
459: if (options.server_alive_interval > 0)
460: server_alive_time = monotime() + options.server_alive_interval;
461: }
462:
463: static void
1.320 djm 464: server_alive_check(struct ssh *ssh)
1.117 markus 465: {
1.320 djm 466: int r;
467:
468: if (ssh_packet_inc_alive_timeouts(ssh) > options.server_alive_count_max) {
1.228 djm 469: logit("Timeout, server %s not responding.", host);
1.176 markus 470: cleanup_exit(255);
471: }
1.320 djm 472: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
473: (r = sshpkt_put_cstring(ssh, "keepalive@openssh.com")) != 0 ||
474: (r = sshpkt_put_u8(ssh, 1)) != 0 || /* boolean: want reply */
475: (r = sshpkt_send(ssh)) != 0)
1.354 djm 476: fatal_fr(r, "send packet");
1.196 djm 477: /* Insert an empty placeholder to maintain ordering */
478: client_register_global_confirm(NULL, NULL);
1.345 dtucker 479: schedule_server_alive_check();
1.117 markus 480: }
481:
1.13 markus 482: /*
483: * Waits until the client can do something (some data becomes available on
484: * one of the file descriptors).
485: */
1.77 itojun 486: static void
1.303 djm 487: client_wait_until_can_do_something(struct ssh *ssh,
488: fd_set **readsetp, fd_set **writesetp,
1.130 avsm 489: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 490: {
1.117 markus 491: struct timeval tv, *tvp;
1.222 djm 492: int timeout_secs;
1.345 dtucker 493: time_t minwait_secs = 0, now = monotime();
1.315 markus 494: int r, ret;
1.117 markus 495:
1.46 markus 496: /* Add any selections by the channel mechanism. */
1.321 djm 497: channel_prepare_select(ssh, readsetp, writesetp, maxfdp,
1.302 djm 498: nallocp, &minwait_secs);
1.11 markus 499:
1.292 djm 500: /* channel_prepare_select could have closed the last channel */
1.303 djm 501: if (session_closed && !channel_still_open(ssh) &&
1.320 djm 502: !ssh_packet_have_data_to_write(ssh)) {
1.292 djm 503: /* clear mask since we did not call select() */
504: memset(*readsetp, 0, *nallocp);
505: memset(*writesetp, 0, *nallocp);
506: return;
1.16 markus 507: }
1.11 markus 508:
1.294 djm 509: FD_SET(connection_in, *readsetp);
510:
1.11 markus 511: /* Select server connection if have data to write to the server. */
1.320 djm 512: if (ssh_packet_have_data_to_write(ssh))
1.46 markus 513: FD_SET(connection_out, *writesetp);
1.11 markus 514:
1.13 markus 515: /*
516: * Wait for something to happen. This will suspend the process until
517: * some selected descriptor can be read, written, or has some other
1.222 djm 518: * event pending, or a timeout expires.
1.13 markus 519: */
1.11 markus 520:
1.222 djm 521: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.345 dtucker 522: if (options.server_alive_interval > 0)
523: timeout_secs = MAXIMUM(server_alive_time - now, 0);
1.292 djm 524: if (options.rekey_interval > 0 && !rekeying)
1.320 djm 525: timeout_secs = MINIMUM(timeout_secs,
526: ssh_packet_get_rekey_timeout(ssh));
1.303 djm 527: set_control_persist_exit_time(ssh);
1.222 djm 528: if (control_persist_exit_time > 0) {
1.287 deraadt 529: timeout_secs = MINIMUM(timeout_secs,
1.249 dtucker 530: control_persist_exit_time - now);
1.222 djm 531: if (timeout_secs < 0)
532: timeout_secs = 0;
533: }
1.239 djm 534: if (minwait_secs != 0)
1.287 deraadt 535: timeout_secs = MINIMUM(timeout_secs, (int)minwait_secs);
1.222 djm 536: if (timeout_secs == INT_MAX)
1.117 markus 537: tvp = NULL;
1.129 deraadt 538: else {
1.222 djm 539: tv.tv_sec = timeout_secs;
1.117 markus 540: tv.tv_usec = 0;
541: tvp = &tv;
542: }
1.222 djm 543:
1.117 markus 544: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
1.326 deraadt 545: if (ret == -1) {
1.51 markus 546: /*
547: * We have to clear the select masks, because we return.
548: * We have to return, because the mainloop checks for the flags
549: * set by the signal handlers.
550: */
1.87 markus 551: memset(*readsetp, 0, *nallocp);
552: memset(*writesetp, 0, *nallocp);
1.11 markus 553: if (errno == EINTR)
554: return;
555: /* Note: we might still have data in the buffers. */
1.315 markus 556: if ((r = sshbuf_putf(stderr_buffer,
557: "select: %s\r\n", strerror(errno))) != 0)
1.354 djm 558: fatal_fr(r, "sshbuf_putf");
1.11 markus 559: quit_pending = 1;
1.345 dtucker 560: } else if (options.server_alive_interval > 0 && !FD_ISSET(connection_in,
1.365 dtucker 561: *readsetp) && monotime() >= server_alive_time)
1.249 dtucker 562: /*
1.345 dtucker 563: * ServerAlive check is needed. We can't rely on the select
564: * timing out since traffic on the client side such as port
565: * forwards can keep waking it up.
1.249 dtucker 566: */
1.345 dtucker 567: server_alive_check(ssh);
1.11 markus 568: }
569:
1.77 itojun 570: static void
1.315 markus 571: client_suspend_self(struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr)
1.1 deraadt 572: {
1.11 markus 573: /* Flush stdout and stderr buffers. */
1.315 markus 574: if (sshbuf_len(bout) > 0)
575: atomicio(vwrite, fileno(stdout), sshbuf_mutable_ptr(bout),
576: sshbuf_len(bout));
577: if (sshbuf_len(berr) > 0)
578: atomicio(vwrite, fileno(stderr), sshbuf_mutable_ptr(berr),
579: sshbuf_len(berr));
1.11 markus 580:
1.233 djm 581: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 582:
1.305 djm 583: sshbuf_reset(bin);
584: sshbuf_reset(bout);
585: sshbuf_reset(berr);
1.11 markus 586:
587: /* Send the suspend signal to the program itself. */
588: kill(getpid(), SIGTSTP);
589:
1.132 djm 590: /* Reset window sizes in case they have changed */
591: received_window_change_signal = 1;
1.11 markus 592:
1.233 djm 593: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 594: }
595:
1.77 itojun 596: static void
1.320 djm 597: client_process_net_input(struct ssh *ssh, fd_set *readset)
1.11 markus 598: {
1.17 markus 599: char buf[8192];
1.315 markus 600: int r, len;
1.11 markus 601:
1.13 markus 602: /*
603: * Read input from the server, and add any such data to the buffer of
604: * the packet subsystem.
605: */
1.11 markus 606: if (FD_ISSET(connection_in, readset)) {
1.345 dtucker 607: schedule_server_alive_check();
1.11 markus 608: /* Read as much as possible. */
1.280 markus 609: len = read(connection_in, buf, sizeof(buf));
610: if (len == 0) {
1.197 djm 611: /*
612: * Received EOF. The remote host has closed the
613: * connection.
614: */
1.315 markus 615: if ((r = sshbuf_putf(stderr_buffer,
1.197 djm 616: "Connection to %.300s closed by remote host.\r\n",
1.315 markus 617: host)) != 0)
1.354 djm 618: fatal_fr(r, "sshbuf_putf");
1.1 deraadt 619: quit_pending = 1;
620: return;
1.11 markus 621: }
1.13 markus 622: /*
623: * There is a kernel bug on Solaris that causes select to
624: * sometimes wake up even though there is no data available.
625: */
1.326 deraadt 626: if (len == -1 && (errno == EAGAIN || errno == EINTR))
1.11 markus 627: len = 0;
628:
1.326 deraadt 629: if (len == -1) {
1.197 djm 630: /*
631: * An error has encountered. Perhaps there is a
632: * network problem.
633: */
1.315 markus 634: if ((r = sshbuf_putf(stderr_buffer,
1.197 djm 635: "Read from remote host %.300s: %.100s\r\n",
1.315 markus 636: host, strerror(errno))) != 0)
1.354 djm 637: fatal_fr(r, "sshbuf_putf");
1.11 markus 638: quit_pending = 1;
639: return;
640: }
1.320 djm 641: ssh_packet_process_incoming(ssh, buf, len);
1.11 markus 642: }
1.17 markus 643: }
1.16 markus 644:
1.97 jakob 645: static void
1.303 djm 646: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 647: {
1.190 djm 648: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
649: char errmsg[256];
1.315 markus 650: int r, tochan;
1.190 djm 651:
1.234 djm 652: /*
653: * If a TTY was explicitly requested, then a failure to allocate
654: * one is fatal.
655: */
656: if (cr->action == CONFIRM_TTY &&
657: (options.request_tty == REQUEST_TTY_FORCE ||
658: options.request_tty == REQUEST_TTY_YES))
659: cr->action = CONFIRM_CLOSE;
660:
1.312 djm 661: /* XXX suppress on mux _client_ quietmode */
1.190 djm 662: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 663: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 664:
665: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
666: debug2("%s request accepted on channel %d",
667: cr->request_type, c->self);
668: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
669: if (tochan) {
670: snprintf(errmsg, sizeof(errmsg),
671: "%s request failed\r\n", cr->request_type);
672: } else {
673: snprintf(errmsg, sizeof(errmsg),
674: "%s request failed on channel %d",
675: cr->request_type, c->self);
676: }
677: /* If error occurred on primary session channel, then exit */
1.234 djm 678: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 679: fatal("%s", errmsg);
1.234 djm 680: /*
681: * If error occurred on mux client, append to
682: * their stderr.
683: */
684: if (tochan) {
1.360 djm 685: debug3_f("channel %d: mux request: %s", c->self,
686: cr->request_type);
1.315 markus 687: if ((r = sshbuf_put(c->extended, errmsg,
688: strlen(errmsg))) != 0)
1.354 djm 689: fatal_fr(r, "sshbuf_put");
1.234 djm 690: } else
1.190 djm 691: error("%s", errmsg);
1.234 djm 692: if (cr->action == CONFIRM_TTY) {
693: /*
694: * If a TTY allocation error occurred, then arrange
695: * for the correct TTY to leave raw mode.
696: */
697: if (c->self == session_ident)
698: leave_raw_mode(0);
699: else
1.303 djm 700: mux_tty_alloc_failed(ssh, c);
1.234 djm 701: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 702: chan_read_failed(ssh, c);
703: chan_write_failed(ssh, c);
1.190 djm 704: }
705: }
1.250 djm 706: free(cr);
1.190 djm 707: }
708:
709: static void
1.303 djm 710: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 711: {
1.250 djm 712: free(ctx);
1.190 djm 713: }
1.129 deraadt 714:
1.236 djm 715: void
1.303 djm 716: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 717: enum confirm_action action)
1.190 djm 718: {
1.255 djm 719: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 720:
1.190 djm 721: cr->request_type = request;
1.234 djm 722: cr->action = action;
1.123 djm 723:
1.303 djm 724: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 725: client_abandon_status_confirm, cr);
1.196 djm 726: }
727:
728: void
729: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
730: {
1.201 djm 731: struct global_confirm *gc, *last_gc;
1.196 djm 732:
733: /* Coalesce identical callbacks */
1.201 djm 734: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
735: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
736: if (++last_gc->ref_count >= INT_MAX)
1.354 djm 737: fatal_f("last_gc->ref_count = %d",
738: last_gc->ref_count);
1.196 djm 739: return;
740: }
741:
1.255 djm 742: gc = xcalloc(1, sizeof(*gc));
1.196 djm 743: gc->cb = cb;
744: gc->ctx = ctx;
745: gc->ref_count = 1;
746: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 747: }
748:
749: static void
1.303 djm 750: process_cmdline(struct ssh *ssh)
1.97 jakob 751: {
752: void (*handler)(int);
1.261 millert 753: char *s, *cmd;
754: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
755: struct Forward fwd;
1.97 jakob 756:
1.257 tedu 757: memset(&fwd, 0, sizeof(fwd));
1.183 djm 758:
1.233 djm 759: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.332 dtucker 760: handler = ssh_signal(SIGINT, SIG_IGN);
1.99 markus 761: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 762: if (s == NULL)
763: goto out;
1.256 deraadt 764: while (isspace((u_char)*s))
1.97 jakob 765: s++;
1.121 djm 766: if (*s == '-')
767: s++; /* Skip cmdline '-', if any */
1.120 dtucker 768: if (*s == '\0')
1.97 jakob 769: goto out;
1.121 djm 770:
1.122 djm 771: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 772: logit("Commands:");
1.164 djm 773: logit(" -L[bind_address:]port:host:hostport "
774: "Request local forward");
775: logit(" -R[bind_address:]port:host:hostport "
776: "Request remote forward");
1.204 stevesk 777: logit(" -D[bind_address:]port "
778: "Request dynamic forward");
1.237 markus 779: logit(" -KL[bind_address:]port "
780: "Cancel local forward");
1.165 stevesk 781: logit(" -KR[bind_address:]port "
1.164 djm 782: "Cancel remote forward");
1.237 markus 783: logit(" -KD[bind_address:]port "
784: "Cancel dynamic forward");
1.146 reyk 785: if (!options.permit_local_command)
786: goto out;
1.164 djm 787: logit(" !args "
788: "Execute local command");
1.146 reyk 789: goto out;
790: }
791:
792: if (*s == '!' && options.permit_local_command) {
793: s++;
794: ssh_local_cmd(s);
1.121 djm 795: goto out;
796: }
797:
798: if (*s == 'K') {
799: delete = 1;
800: s++;
801: }
1.204 stevesk 802: if (*s == 'L')
803: local = 1;
804: else if (*s == 'R')
805: remote = 1;
806: else if (*s == 'D')
807: dynamic = 1;
808: else {
1.109 itojun 809: logit("Invalid command.");
1.97 jakob 810: goto out;
811: }
1.204 stevesk 812:
1.256 deraadt 813: while (isspace((u_char)*++s))
1.179 tedu 814: ;
1.97 jakob 815:
1.217 djm 816: /* XXX update list of forwards in options */
1.121 djm 817: if (delete) {
1.261 millert 818: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
819: if (!parse_forward(&fwd, s, 1, 0)) {
820: logit("Bad forwarding close specification.");
1.121 djm 821: goto out;
822: }
1.237 markus 823: if (remote)
1.303 djm 824: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 825: else if (dynamic)
1.303 djm 826: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 827: 0, &options.fwd_opts) > 0;
1.237 markus 828: else
1.303 djm 829: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 830: CHANNEL_CANCEL_PORT_STATIC,
831: &options.fwd_opts) > 0;
1.237 markus 832: if (!ok) {
1.290 dtucker 833: logit("Unknown port forwarding.");
1.237 markus 834: goto out;
835: }
836: logit("Canceled forwarding.");
1.121 djm 837: } else {
1.209 djm 838: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 839: logit("Bad forwarding specification.");
840: goto out;
841: }
1.204 stevesk 842: if (local || dynamic) {
1.303 djm 843: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 844: &options.fwd_opts)) {
1.121 djm 845: logit("Port forwarding failed.");
846: goto out;
847: }
1.135 djm 848: } else {
1.303 djm 849: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 850: logit("Port forwarding failed.");
851: goto out;
852: }
1.135 djm 853: }
1.121 djm 854: logit("Forwarding port.");
855: }
856:
1.97 jakob 857: out:
1.332 dtucker 858: ssh_signal(SIGINT, handler);
1.233 djm 859: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 860: free(cmd);
861: free(fwd.listen_host);
1.261 millert 862: free(fwd.listen_path);
1.250 djm 863: free(fwd.connect_host);
1.261 millert 864: free(fwd.connect_path);
1.97 jakob 865: }
866:
1.244 dtucker 867: /* reasons to suppress output of an escape command in help output */
868: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 869: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
870: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
871: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.244 dtucker 872: struct escape_help_text {
873: const char *cmd;
874: const char *text;
875: unsigned int flags;
876: };
877: static struct escape_help_text esc_txt[] = {
878: {".", "terminate session", SUPPRESS_MUXMASTER},
879: {".", "terminate connection (and any multiplexed sessions)",
880: SUPPRESS_MUXCLIENT},
1.292 djm 881: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.244 dtucker 882: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1.292 djm 883: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 884: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 885: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
886: {"#", "list forwarded connections", SUPPRESS_NEVER},
887: {"&", "background ssh (when waiting for connections to terminate)",
888: SUPPRESS_MUXCLIENT},
889: {"?", "this message", SUPPRESS_NEVER},
890: };
891:
892: static void
1.315 markus 893: print_escape_help(struct sshbuf *b, int escape_char, int mux_client,
894: int using_stderr)
1.244 dtucker 895: {
896: unsigned int i, suppress_flags;
1.315 markus 897: int r;
1.244 dtucker 898:
1.315 markus 899: if ((r = sshbuf_putf(b,
900: "%c?\r\nSupported escape sequences:\r\n", escape_char)) != 0)
1.354 djm 901: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 902:
1.292 djm 903: suppress_flags =
1.244 dtucker 904: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
905: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
906: (using_stderr ? 0 : SUPPRESS_SYSLOG);
907:
908: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
909: if (esc_txt[i].flags & suppress_flags)
910: continue;
1.315 markus 911: if ((r = sshbuf_putf(b, " %c%-3s - %s\r\n",
912: escape_char, esc_txt[i].cmd, esc_txt[i].text)) != 0)
1.354 djm 913: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 914: }
915:
1.315 markus 916: if ((r = sshbuf_putf(b,
1.246 dtucker 917: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 918: "(Note that escapes are only recognized immediately after "
1.315 markus 919: "newline.)\r\n", escape_char, escape_char)) != 0)
1.354 djm 920: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 921: }
922:
1.314 djm 923: /*
1.296 naddy 924: * Process the characters one by one.
1.195 djm 925: */
1.77 itojun 926: static int
1.303 djm 927: process_escapes(struct ssh *ssh, Channel *c,
1.315 markus 928: struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr,
1.195 djm 929: char *buf, int len)
1.31 markus 930: {
931: pid_t pid;
1.315 markus 932: int r, bytes = 0;
1.42 markus 933: u_int i;
934: u_char ch;
1.31 markus 935: char *s;
1.294 djm 936: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
937: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 938:
1.294 djm 939: if (c->filter_ctx == NULL)
940: return 0;
1.314 djm 941:
1.139 djm 942: if (len <= 0)
943: return (0);
944:
945: for (i = 0; i < (u_int)len; i++) {
1.31 markus 946: /* Get one character at a time. */
947: ch = buf[i];
948:
1.294 djm 949: if (efc->escape_pending) {
1.31 markus 950: /* We have previously seen an escape character. */
951: /* Clear the flag now. */
1.294 djm 952: efc->escape_pending = 0;
1.31 markus 953:
954: /* Process the escaped character. */
955: switch (ch) {
956: case '.':
957: /* Terminate the connection. */
1.315 markus 958: if ((r = sshbuf_putf(berr, "%c.\r\n",
959: efc->escape_char)) != 0)
1.354 djm 960: fatal_fr(r, "sshbuf_putf");
1.217 djm 961: if (c && c->ctl_chan != -1) {
1.303 djm 962: chan_read_failed(ssh, c);
963: chan_write_failed(ssh, c);
964: if (c->detach_user) {
965: c->detach_user(ssh,
966: c->self, NULL);
967: }
1.253 dtucker 968: c->type = SSH_CHANNEL_ABANDONED;
1.315 markus 969: sshbuf_reset(c->input);
1.303 djm 970: chan_ibuf_empty(ssh, c);
1.195 djm 971: return 0;
972: } else
973: quit_pending = 1;
1.31 markus 974: return -1;
975:
976: case 'Z' - 64:
1.195 djm 977: /* XXX support this for mux clients */
1.217 djm 978: if (c && c->ctl_chan != -1) {
1.245 dtucker 979: char b[16];
1.195 djm 980: noescape:
1.245 dtucker 981: if (ch == 'Z' - 64)
982: snprintf(b, sizeof b, "^Z");
983: else
984: snprintf(b, sizeof b, "%c", ch);
1.315 markus 985: if ((r = sshbuf_putf(berr,
1.245 dtucker 986: "%c%s escape not available to "
1.195 djm 987: "multiplexed sessions\r\n",
1.315 markus 988: efc->escape_char, b)) != 0)
1.354 djm 989: fatal_fr(r, "sshbuf_putf");
1.195 djm 990: continue;
991: }
1.197 djm 992: /* Suspend the program. Inform the user */
1.315 markus 993: if ((r = sshbuf_putf(berr,
994: "%c^Z [suspend ssh]\r\n",
995: efc->escape_char)) != 0)
1.354 djm 996: fatal_fr(r, "sshbuf_putf");
1.31 markus 997:
998: /* Restore terminal modes and suspend. */
999: client_suspend_self(bin, bout, berr);
1000:
1001: /* We have been continued. */
1002: continue;
1003:
1.111 markus 1004: case 'B':
1.315 markus 1005: if ((r = sshbuf_putf(berr,
1006: "%cB\r\n", efc->escape_char)) != 0)
1.354 djm 1007: fatal_fr(r, "sshbuf_putf");
1.303 djm 1008: channel_request_start(ssh, c->self, "break", 0);
1.315 markus 1009: if ((r = sshpkt_put_u32(ssh, 1000)) != 0 ||
1010: (r = sshpkt_send(ssh)) != 0)
1.354 djm 1011: fatal_fr(r, "send packet");
1.111 markus 1012: continue;
1013:
1.54 markus 1014: case 'R':
1.357 djm 1015: if (ssh->compat & SSH_BUG_NOREKEY)
1.292 djm 1016: logit("Server does not "
1017: "support re-keying");
1018: else
1019: need_rekeying = 1;
1.54 markus 1020: continue;
1021:
1.242 dtucker 1022: case 'V':
1023: /* FALLTHROUGH */
1024: case 'v':
1025: if (c && c->ctl_chan != -1)
1026: goto noescape;
1027: if (!log_is_on_stderr()) {
1.315 markus 1028: if ((r = sshbuf_putf(berr,
1.242 dtucker 1029: "%c%c [Logging to syslog]\r\n",
1.315 markus 1030: efc->escape_char, ch)) != 0)
1.354 djm 1031: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1032: continue;
1033: }
1034: if (ch == 'V' && options.log_level >
1035: SYSLOG_LEVEL_QUIET)
1036: log_change_level(--options.log_level);
1037: if (ch == 'v' && options.log_level <
1038: SYSLOG_LEVEL_DEBUG3)
1039: log_change_level(++options.log_level);
1.315 markus 1040: if ((r = sshbuf_putf(berr,
1.294 djm 1041: "%c%c [LogLevel %s]\r\n",
1042: efc->escape_char, ch,
1.315 markus 1043: log_level_name(options.log_level))) != 0)
1.354 djm 1044: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1045: continue;
1046:
1.31 markus 1047: case '&':
1.217 djm 1048: if (c && c->ctl_chan != -1)
1.195 djm 1049: goto noescape;
1.31 markus 1050: /*
1.197 djm 1051: * Detach the program (continue to serve
1052: * connections, but put in background and no
1053: * more new connections).
1.31 markus 1054: */
1055: /* Restore tty modes. */
1.233 djm 1056: leave_raw_mode(
1057: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1058:
1059: /* Stop listening for new connections. */
1.303 djm 1060: channel_stop_listening(ssh);
1.31 markus 1061:
1.354 djm 1062: if ((r = sshbuf_putf(berr, "%c& "
1063: "[backgrounded]\n", efc->escape_char)) != 0)
1064: fatal_fr(r, "sshbuf_putf");
1.31 markus 1065:
1066: /* Fork into background. */
1067: pid = fork();
1.326 deraadt 1068: if (pid == -1) {
1.31 markus 1069: error("fork: %.100s", strerror(errno));
1070: continue;
1071: }
1072: if (pid != 0) { /* This is the parent. */
1073: /* The parent just exits. */
1074: exit(0);
1075: }
1076: /* The child continues serving connections. */
1.292 djm 1077: /* fake EOF on stdin */
1.315 markus 1078: if ((r = sshbuf_put_u8(bin, 4)) != 0)
1.354 djm 1079: fatal_fr(r, "sshbuf_put_u8");
1.292 djm 1080: return -1;
1.31 markus 1081: case '?':
1.294 djm 1082: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1083: (c && c->ctl_chan != -1),
1084: log_is_on_stderr());
1.31 markus 1085: continue;
1086:
1087: case '#':
1.315 markus 1088: if ((r = sshbuf_putf(berr, "%c#\r\n",
1089: efc->escape_char)) != 0)
1.354 djm 1090: fatal_fr(r, "sshbuf_putf");
1.303 djm 1091: s = channel_open_message(ssh);
1.315 markus 1092: if ((r = sshbuf_put(berr, s, strlen(s))) != 0)
1.354 djm 1093: fatal_fr(r, "sshbuf_put");
1.250 djm 1094: free(s);
1.97 jakob 1095: continue;
1096:
1097: case 'C':
1.217 djm 1098: if (c && c->ctl_chan != -1)
1.206 djm 1099: goto noescape;
1.303 djm 1100: process_cmdline(ssh);
1.31 markus 1101: continue;
1102:
1103: default:
1.294 djm 1104: if (ch != efc->escape_char) {
1.315 markus 1105: if ((r = sshbuf_put_u8(bin,
1106: efc->escape_char)) != 0)
1.354 djm 1107: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1108: bytes++;
1109: }
1110: /* Escaped characters fall through here */
1111: break;
1112: }
1113: } else {
1114: /*
1.197 djm 1115: * The previous character was not an escape char.
1116: * Check if this is an escape.
1.31 markus 1117: */
1.294 djm 1118: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1119: /*
1120: * It is. Set the flag and continue to
1121: * next character.
1122: */
1.294 djm 1123: efc->escape_pending = 1;
1.31 markus 1124: continue;
1125: }
1126: }
1127:
1128: /*
1129: * Normal character. Record whether it was a newline,
1130: * and append it to the buffer.
1131: */
1132: last_was_cr = (ch == '\r' || ch == '\n');
1.315 markus 1133: if ((r = sshbuf_put_u8(bin, ch)) != 0)
1.354 djm 1134: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1135: bytes++;
1136: }
1137: return bytes;
1138: }
1139:
1.13 markus 1140: /*
1.15 markus 1141: * Get packets from the connection input buffer, and process them as long as
1142: * there are packets available.
1143: *
1144: * Any unknown packets received during the actual
1145: * session cause the session to terminate. This is
1146: * intended to make debugging easier since no
1147: * confirmations are sent. Any compatible protocol
1148: * extensions must be negotiated during the
1149: * preparatory phase.
1150: */
1151:
1.77 itojun 1152: static void
1.321 djm 1153: client_process_buffered_input_packets(struct ssh *ssh)
1.15 markus 1154: {
1.321 djm 1155: ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1156: }
1157:
1.31 markus 1158: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1159:
1.195 djm 1160: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1161: void *
1162: client_new_escape_filter_ctx(int escape_char)
1163: {
1164: struct escape_filter_ctx *ret;
1165:
1.255 djm 1166: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1167: ret->escape_pending = 0;
1168: ret->escape_char = escape_char;
1169: return (void *)ret;
1170: }
1171:
1.198 djm 1172: /* Free the escape filter context on channel free */
1173: void
1.303 djm 1174: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1175: {
1.250 djm 1176: free(ctx);
1.198 djm 1177: }
1178:
1.195 djm 1179: int
1.303 djm 1180: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1181: {
1.190 djm 1182: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1183: return 0;
1184:
1.303 djm 1185: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1186: buf, len);
1.30 markus 1187: }
1188:
1.77 itojun 1189: static void
1.303 djm 1190: client_channel_closed(struct ssh *ssh, int id, void *arg)
1.60 markus 1191: {
1.303 djm 1192: channel_cancel_cleanup(ssh, id);
1.60 markus 1193: session_closed = 1;
1.233 djm 1194: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1195: }
1196:
1.15 markus 1197: /*
1.13 markus 1198: * Implements the interactive session with the server. This is called after
1199: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1200: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1201: * used as an escape character for terminating or suspending the session.
1.13 markus 1202: */
1.20 markus 1203: int
1.303 djm 1204: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1205: int ssh2_chan_id)
1.1 deraadt 1206: {
1.46 markus 1207: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1208: double start_time, total_time;
1.284 djm 1209: int r, max_fd = 0, max_fd2 = 0, len;
1.200 markus 1210: u_int64_t ibytes, obytes;
1.130 avsm 1211: u_int nalloc = 0;
1.11 markus 1212:
1213: debug("Entering interactive session.");
1.277 semarie 1214:
1.278 semarie 1215: if (options.control_master &&
1.286 djm 1216: !option_clear_or_none(options.control_path)) {
1.278 semarie 1217: debug("pledge: id");
1.327 mestre 1218: if (pledge("stdio rpath wpath cpath unix inet dns recvfd sendfd proc exec id tty",
1.278 semarie 1219: NULL) == -1)
1.354 djm 1220: fatal_f("pledge(): %s", strerror(errno));
1.278 semarie 1221:
1222: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1223: debug("pledge: exec");
1224: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1225: NULL) == -1)
1.354 djm 1226: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1227:
1228: } else if (options.update_hostkeys) {
1229: debug("pledge: filesystem full");
1230: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1231: NULL) == -1)
1.354 djm 1232: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1233:
1.286 djm 1234: } else if (!option_clear_or_none(options.proxy_command) ||
1235: fork_after_authentication_flag) {
1.277 semarie 1236: debug("pledge: proc");
1237: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1.354 djm 1238: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1239:
1240: } else {
1241: debug("pledge: network");
1.300 mestre 1242: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.354 djm 1243: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1244: }
1.11 markus 1245:
1.307 dtucker 1246: start_time = monotime_double();
1.11 markus 1247:
1248: /* Initialize variables. */
1249: last_was_cr = 1;
1250: exit_status = -1;
1.320 djm 1251: connection_in = ssh_packet_get_connection_in(ssh);
1252: connection_out = ssh_packet_get_connection_out(ssh);
1.287 deraadt 1253: max_fd = MAXIMUM(connection_in, connection_out);
1.46 markus 1254:
1.11 markus 1255: quit_pending = 0;
1256:
1.315 markus 1257: /* Initialize buffer. */
1258: if ((stderr_buffer = sshbuf_new()) == NULL)
1.354 djm 1259: fatal_f("sshbuf_new failed");
1.11 markus 1260:
1.321 djm 1261: client_init_dispatch(ssh);
1.15 markus 1262:
1.105 markus 1263: /*
1264: * Set signal handlers, (e.g. to restore non-blocking mode)
1265: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1266: */
1.332 dtucker 1267: if (ssh_signal(SIGHUP, SIG_IGN) != SIG_IGN)
1268: ssh_signal(SIGHUP, signal_handler);
1269: if (ssh_signal(SIGINT, SIG_IGN) != SIG_IGN)
1270: ssh_signal(SIGINT, signal_handler);
1271: if (ssh_signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1272: ssh_signal(SIGQUIT, signal_handler);
1273: if (ssh_signal(SIGTERM, SIG_IGN) != SIG_IGN)
1274: ssh_signal(SIGTERM, signal_handler);
1275: ssh_signal(SIGWINCH, window_change_handler);
1.11 markus 1276:
1277: if (have_pty)
1.233 djm 1278: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1279:
1.292 djm 1280: session_ident = ssh2_chan_id;
1281: if (session_ident != -1) {
1282: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1283: channel_register_filter(ssh, session_ident,
1.292 djm 1284: client_simple_escape_filter, NULL,
1285: client_filter_cleanup,
1286: client_new_escape_filter_ctx(
1287: escape_char_arg));
1.232 djm 1288: }
1.303 djm 1289: channel_register_cleanup(ssh, session_ident,
1.292 djm 1290: client_channel_closed, 0);
1.48 markus 1291: }
1.345 dtucker 1292:
1293: schedule_server_alive_check();
1.30 markus 1294:
1.11 markus 1295: /* Main loop of the client for the interactive session mode. */
1296: while (!quit_pending) {
1297:
1.13 markus 1298: /* Process buffered packets sent by the server. */
1.321 djm 1299: client_process_buffered_input_packets(ssh);
1.11 markus 1300:
1.303 djm 1301: if (session_closed && !channel_still_open(ssh))
1.60 markus 1302: break;
1303:
1.303 djm 1304: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1305: debug("rekeying in progress");
1.284 djm 1306: } else if (need_rekeying) {
1307: /* manual rekey request */
1308: debug("need rekeying");
1.303 djm 1309: if ((r = kex_start_rekex(ssh)) != 0)
1.354 djm 1310: fatal_fr(r, "kex_start_rekex");
1.284 djm 1311: need_rekeying = 0;
1.56 markus 1312: } else {
1313: /*
1314: * Make packets from buffered channel data, and
1315: * enqueue them for sending to the server.
1316: */
1.320 djm 1317: if (ssh_packet_not_very_much_data_to_write(ssh))
1.303 djm 1318: channel_output_poll(ssh);
1.11 markus 1319:
1.56 markus 1320: /*
1321: * Check if the window size has changed, and buffer a
1322: * message about it to the server if so.
1323: */
1.303 djm 1324: client_check_window_change(ssh);
1.11 markus 1325:
1.56 markus 1326: if (quit_pending)
1327: break;
1328: }
1.13 markus 1329: /*
1330: * Wait until we have something to do (something becomes
1331: * available on one of the descriptors).
1332: */
1.81 markus 1333: max_fd2 = max_fd;
1.303 djm 1334: client_wait_until_can_do_something(ssh, &readset, &writeset,
1335: &max_fd2, &nalloc, ssh_packet_is_rekeying(ssh));
1.11 markus 1336:
1337: if (quit_pending)
1338: break;
1339:
1.56 markus 1340: /* Do channel operations unless rekeying in progress. */
1.303 djm 1341: if (!ssh_packet_is_rekeying(ssh))
1342: channel_after_select(ssh, readset, writeset);
1.11 markus 1343:
1.17 markus 1344: /* Buffer input from the connection. */
1.320 djm 1345: client_process_net_input(ssh, readset);
1.17 markus 1346:
1347: if (quit_pending)
1348: break;
1.367 djm 1349:
1350: /* A timeout may have triggered rekeying */
1351: if ((r = ssh_packet_check_rekey(ssh)) != 0)
1352: fatal_fr(r, "cannot start rekeying");
1.11 markus 1353:
1.197 djm 1354: /*
1355: * Send as much buffered packet data as possible to the
1356: * sender.
1357: */
1.338 djm 1358: if (FD_ISSET(connection_out, writeset)) {
1359: if ((r = ssh_packet_write_poll(ssh)) != 0) {
1360: sshpkt_fatal(ssh, r,
1361: "%s: ssh_packet_write_poll", __func__);
1362: }
1363: }
1.222 djm 1364:
1365: /*
1366: * If we are a backgrounded control master, and the
1367: * timeout has expired without any active client
1368: * connections, then quit.
1369: */
1370: if (control_persist_exit_time > 0) {
1.251 dtucker 1371: if (monotime() >= control_persist_exit_time) {
1.222 djm 1372: debug("ControlPersist timeout expired");
1373: break;
1374: }
1375: }
1.11 markus 1376: }
1.250 djm 1377: free(readset);
1378: free(writeset);
1.11 markus 1379:
1380: /* Terminate the session. */
1381:
1382: /* Stop watching for window change. */
1.332 dtucker 1383: ssh_signal(SIGWINCH, SIG_DFL);
1.211 andreas 1384:
1.320 djm 1385: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
1386: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_BY_APPLICATION)) != 0 ||
1387: (r = sshpkt_put_cstring(ssh, "disconnected by user")) != 0 ||
1388: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language tag */
1389: (r = sshpkt_send(ssh)) != 0 ||
1390: (r = ssh_packet_write_wait(ssh)) != 0)
1.354 djm 1391: fatal_fr(r, "send disconnect");
1.11 markus 1392:
1.303 djm 1393: channel_free_all(ssh);
1.11 markus 1394:
1.75 markus 1395: if (have_pty)
1.233 djm 1396: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.116 dtucker 1397:
1398: /*
1399: * If there was no shell or command requested, there will be no remote
1400: * exit status to be returned. In that case, clear error code if the
1401: * connection was deliberately terminated at this end.
1402: */
1.366 djm 1403: if (options.session_type == SESSION_TYPE_NONE && received_signal == SIGTERM) {
1.116 dtucker 1404: received_signal = 0;
1405: exit_status = 0;
1406: }
1.75 markus 1407:
1.301 dtucker 1408: if (received_signal) {
1409: verbose("Killed by signal %d.", (int) received_signal);
1.359 djm 1410: cleanup_exit(255);
1.301 dtucker 1411: }
1.75 markus 1412:
1.13 markus 1413: /*
1414: * In interactive mode (with pseudo tty) display a message indicating
1415: * that the connection has been closed.
1416: */
1.11 markus 1417: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.315 markus 1418: if ((r = sshbuf_putf(stderr_buffer,
1419: "Connection to %.64s closed.\r\n", host)) != 0)
1.354 djm 1420: fatal_fr(r, "sshbuf_putf");
1.11 markus 1421: }
1.70 markus 1422:
1.11 markus 1423: /* Output any buffered data for stderr. */
1.315 markus 1424: if (sshbuf_len(stderr_buffer) > 0) {
1.230 djm 1425: len = atomicio(vwrite, fileno(stderr),
1.315 markus 1426: (u_char *)sshbuf_ptr(stderr_buffer),
1427: sshbuf_len(stderr_buffer));
1428: if (len < 0 || (u_int)len != sshbuf_len(stderr_buffer))
1.11 markus 1429: error("Write failed flushing stderr buffer.");
1.315 markus 1430: else if ((r = sshbuf_consume(stderr_buffer, len)) != 0)
1.354 djm 1431: fatal_fr(r, "sshbuf_consume");
1.11 markus 1432: }
1433:
1434: /* Clear and free any buffers. */
1.315 markus 1435: sshbuf_free(stderr_buffer);
1.11 markus 1436:
1437: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1438: total_time = monotime_double() - start_time;
1.320 djm 1439: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.200 markus 1440: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1441: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1442: if (total_time > 0)
1.200 markus 1443: verbose("Bytes per second: sent %.1f, received %.1f",
1444: obytes / total_time, ibytes / total_time);
1.11 markus 1445: /* Return the exit status of the program. */
1446: debug("Exit status %d", exit_status);
1447: return exit_status;
1.15 markus 1448: }
1449:
1450: /*********/
1451:
1.77 itojun 1452: static Channel *
1.303 djm 1453: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1454: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1455: {
1.103 deraadt 1456: Channel *c = NULL;
1.289 markus 1457: struct sshbuf *b = NULL;
1.40 markus 1458: char *listen_address, *originator_address;
1.320 djm 1459: u_int listen_port, originator_port;
1.289 markus 1460: int r;
1.40 markus 1461:
1462: /* Get rest of the packet */
1.320 djm 1463: if ((r = sshpkt_get_cstring(ssh, &listen_address, NULL)) != 0 ||
1464: (r = sshpkt_get_u32(ssh, &listen_port)) != 0 ||
1465: (r = sshpkt_get_cstring(ssh, &originator_address, NULL)) != 0 ||
1466: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1467: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1468: fatal_fr(r, "parse packet");
1.40 markus 1469:
1.354 djm 1470: debug_f("listen %s port %d, originator %s port %d",
1.261 millert 1471: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1472:
1.320 djm 1473: if (listen_port > 0xffff)
1.354 djm 1474: error_f("invalid listen port");
1.320 djm 1475: else if (originator_port > 0xffff)
1.354 djm 1476: error_f("invalid originator port");
1.320 djm 1477: else {
1478: c = channel_connect_by_listen_address(ssh,
1479: listen_address, listen_port, "forwarded-tcpip",
1480: originator_address);
1481: }
1.40 markus 1482:
1.289 markus 1483: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1484: if ((b = sshbuf_new()) == NULL) {
1.354 djm 1485: error_f("alloc reply");
1.289 markus 1486: goto out;
1487: }
1488: /* reconstruct and send to muxclient */
1489: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1490: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1491: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1492: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1493: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1494: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1495: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1496: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1497: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1498: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1499: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.354 djm 1500: error_fr(r, "compose for muxclient");
1.289 markus 1501: goto out;
1502: }
1503: }
1504:
1505: out:
1506: sshbuf_free(b);
1.250 djm 1507: free(originator_address);
1508: free(listen_address);
1.40 markus 1509: return c;
1510: }
1511:
1.103 deraadt 1512: static Channel *
1.303 djm 1513: client_request_forwarded_streamlocal(struct ssh *ssh,
1514: const char *request_type, int rchan)
1.261 millert 1515: {
1516: Channel *c = NULL;
1517: char *listen_path;
1.320 djm 1518: int r;
1.261 millert 1519:
1520: /* Get the remote path. */
1.320 djm 1521: if ((r = sshpkt_get_cstring(ssh, &listen_path, NULL)) != 0 ||
1522: (r = sshpkt_get_string(ssh, NULL, NULL)) != 0 || /* reserved */
1523: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1524: fatal_fr(r, "parse packet");
1.261 millert 1525:
1.354 djm 1526: debug_f("request: %s", listen_path);
1.261 millert 1527:
1.303 djm 1528: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1529: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1530: free(listen_path);
1531: return c;
1532: }
1533:
1534: static Channel *
1.303 djm 1535: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1536: {
1537: Channel *c = NULL;
1538: char *originator;
1.321 djm 1539: u_int originator_port;
1.320 djm 1540: int r, sock;
1.40 markus 1541:
1542: if (!options.forward_x11) {
1543: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1544: error("Warning: this is probably a break-in attempt by a "
1545: "malicious server.");
1.221 djm 1546: return NULL;
1547: }
1.274 djm 1548: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1549: verbose("Rejected X11 connection after ForwardX11Timeout "
1550: "expired");
1.40 markus 1551: return NULL;
1552: }
1.320 djm 1553: if ((r = sshpkt_get_cstring(ssh, &originator, NULL)) != 0 ||
1.321 djm 1554: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1.320 djm 1555: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1556: fatal_fr(r, "parse packet");
1.40 markus 1557: /* XXX check permission */
1.321 djm 1558: /* XXX range check originator port? */
1559: debug("client_request_x11: request from %s %u", originator,
1.47 markus 1560: originator_port);
1.250 djm 1561: free(originator);
1.303 djm 1562: sock = x11_connect_display(ssh);
1.67 markus 1563: if (sock < 0)
1564: return NULL;
1.303 djm 1565: c = channel_new(ssh, "x11",
1.67 markus 1566: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1567: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1568: c->force_drain = 1;
1.40 markus 1569: return c;
1570: }
1571:
1.103 deraadt 1572: static Channel *
1.303 djm 1573: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1574: {
1575: Channel *c = NULL;
1.262 djm 1576: int r, sock;
1.40 markus 1577:
1578: if (!options.forward_agent) {
1579: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1580: error("Warning: this is probably a break-in attempt by a "
1581: "malicious server.");
1.40 markus 1582: return NULL;
1583: }
1.330 djm 1584: if (forward_agent_sock_path == NULL) {
1585: r = ssh_get_authentication_socket(&sock);
1586: } else {
1587: r = ssh_get_authentication_socket_path(forward_agent_sock_path, &sock);
1588: }
1589: if (r != 0) {
1.262 djm 1590: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.354 djm 1591: debug_fr(r, "ssh_get_authentication_socket");
1.67 markus 1592: return NULL;
1.262 djm 1593: }
1.303 djm 1594: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1595: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1596: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1597: "authentication agent connection", 1);
1.82 markus 1598: c->force_drain = 1;
1.40 markus 1599: return c;
1.180 djm 1600: }
1601:
1.306 djm 1602: char *
1.303 djm 1603: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1.343 djm 1604: int local_tun, int remote_tun, channel_open_fn *cb, void *cbctx)
1.180 djm 1605: {
1606: Channel *c;
1.320 djm 1607: int r, fd;
1.306 djm 1608: char *ifname = NULL;
1.180 djm 1609:
1610: if (tun_mode == SSH_TUNMODE_NO)
1611: return 0;
1612:
1613: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1614:
1615: /* Open local tunnel device */
1.306 djm 1616: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1617: error("Tunnel device open failed.");
1.306 djm 1618: return NULL;
1.180 djm 1619: }
1.306 djm 1620: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1621:
1.303 djm 1622: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1623: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1624: c->datagram = 1;
1.343 djm 1625:
1626: if (cb != NULL)
1627: channel_register_open_confirm(ssh, c->self, cb, cbctx);
1.180 djm 1628:
1.320 djm 1629: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1630: (r = sshpkt_put_cstring(ssh, "tun@openssh.com")) != 0 ||
1631: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1632: (r = sshpkt_put_u32(ssh, c->local_window_max)) != 0 ||
1633: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1634: (r = sshpkt_put_u32(ssh, tun_mode)) != 0 ||
1635: (r = sshpkt_put_u32(ssh, remote_tun)) != 0 ||
1636: (r = sshpkt_send(ssh)) != 0)
1.321 djm 1637: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.180 djm 1638:
1.306 djm 1639: return ifname;
1.40 markus 1640: }
1641:
1.22 markus 1642: /* XXXX move to generic input handler */
1.264 markus 1643: static int
1.297 markus 1644: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1645: {
1646: Channel *c = NULL;
1.320 djm 1647: char *ctype = NULL;
1648: int r;
1649: u_int rchan;
1650: size_t len;
1651: u_int rmaxpack, rwindow;
1652:
1653: if ((r = sshpkt_get_cstring(ssh, &ctype, &len)) != 0 ||
1654: (r = sshpkt_get_u32(ssh, &rchan)) != 0 ||
1655: (r = sshpkt_get_u32(ssh, &rwindow)) != 0 ||
1656: (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0)
1657: goto out;
1.22 markus 1658:
1.24 markus 1659: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1660: ctype, rchan, rwindow, rmaxpack);
1661:
1.40 markus 1662: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1663: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1664: rmaxpack);
1.261 millert 1665: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1666: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1667: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1668: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1669: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1670: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1671: }
1.289 markus 1672: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1673: debug3("proxied to downstream: %s", ctype);
1674: } else if (c != NULL) {
1.22 markus 1675: debug("confirm %s", ctype);
1676: c->remote_id = rchan;
1.304 djm 1677: c->have_remote_id = 1;
1.22 markus 1678: c->remote_window = rwindow;
1679: c->remote_maxpacket = rmaxpack;
1.69 markus 1680: if (c->type != SSH_CHANNEL_CONNECTING) {
1.320 djm 1681: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1682: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1683: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1684: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1685: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1686: (r = sshpkt_send(ssh)) != 0)
1687: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.69 markus 1688: }
1.22 markus 1689: } else {
1690: debug("failure %s", ctype);
1.320 djm 1691: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
1692: (r = sshpkt_put_u32(ssh, rchan)) != 0 ||
1693: (r = sshpkt_put_u32(ssh, SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED)) != 0 ||
1694: (r = sshpkt_put_cstring(ssh, "open failed")) != 0 ||
1695: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1696: (r = sshpkt_send(ssh)) != 0)
1697: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.22 markus 1698: }
1.320 djm 1699: r = 0;
1700: out:
1.250 djm 1701: free(ctype);
1.320 djm 1702: return r;
1.22 markus 1703: }
1.267 djm 1704:
1.264 markus 1705: static int
1.297 markus 1706: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1707: {
1708: Channel *c = NULL;
1.320 djm 1709: char *rtype = NULL;
1710: u_char reply;
1711: u_int id, exitval;
1712: int r, success = 0;
1713:
1714: if ((r = sshpkt_get_u32(ssh, &id)) != 0)
1715: return r;
1716: if (id <= INT_MAX)
1717: c = channel_lookup(ssh, id);
1.297 markus 1718: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1719: return 0;
1.320 djm 1720: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
1721: (r = sshpkt_get_u8(ssh, &reply)) != 0)
1722: goto out;
1.48 markus 1723:
1.320 djm 1724: debug("client_input_channel_req: channel %u rtype %s reply %d",
1.48 markus 1725: id, rtype, reply);
1726:
1.320 djm 1727: if (c == NULL) {
1.197 djm 1728: error("client_input_channel_req: channel %d: "
1729: "unknown channel", id);
1.193 markus 1730: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1.320 djm 1731: if ((r = sshpkt_get_end(ssh)) != 0)
1732: goto out;
1.303 djm 1733: chan_rcvd_eow(ssh, c);
1.48 markus 1734: } else if (strcmp(rtype, "exit-status") == 0) {
1.320 djm 1735: if ((r = sshpkt_get_u32(ssh, &exitval)) != 0)
1736: goto out;
1.217 djm 1737: if (c->ctl_chan != -1) {
1.303 djm 1738: mux_exit_message(ssh, c, exitval);
1.215 djm 1739: success = 1;
1.320 djm 1740: } else if ((int)id == session_ident) {
1.215 djm 1741: /* Record exit value of local session */
1.123 djm 1742: success = 1;
1743: exit_status = exitval;
1.215 djm 1744: } else {
1.218 djm 1745: /* Probably for a mux channel that has already closed */
1.354 djm 1746: debug_f("no sink for exit-status on channel %d",
1747: id);
1.123 djm 1748: }
1.320 djm 1749: if ((r = sshpkt_get_end(ssh)) != 0)
1750: goto out;
1.48 markus 1751: }
1.259 djm 1752: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1753: if (!c->have_remote_id)
1.354 djm 1754: fatal_f("channel %d: no remote_id", c->self);
1.320 djm 1755: if ((r = sshpkt_start(ssh, success ?
1756: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE)) != 0 ||
1757: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1758: (r = sshpkt_send(ssh)) != 0)
1759: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.48 markus 1760: }
1.320 djm 1761: r = 0;
1762: out:
1.250 djm 1763: free(rtype);
1.320 djm 1764: return r;
1.48 markus 1765: }
1.267 djm 1766:
1.269 djm 1767: struct hostkeys_update_ctx {
1768: /* The hostname and (optionally) IP address string for the server */
1769: char *host_str, *ip_str;
1770:
1771: /*
1772: * Keys received from the server and a flag for each indicating
1773: * whether they already exist in known_hosts.
1.351 djm 1774: * keys_match is filled in by hostkeys_find() and later (for new
1.269 djm 1775: * keys) by client_global_hostkeys_private_confirm().
1776: */
1777: struct sshkey **keys;
1.351 djm 1778: u_int *keys_match; /* mask of HKF_MATCH_* from hostfile.h */
1779: int *keys_verified; /* flag for new keys verified by server */
1780: size_t nkeys, nnew, nincomplete; /* total, new keys, incomplete match */
1.269 djm 1781:
1782: /*
1783: * Keys that are in known_hosts, but were not present in the update
1784: * from the server (i.e. scheduled to be deleted).
1785: * Filled in by hostkeys_find().
1786: */
1787: struct sshkey **old_keys;
1788: size_t nold;
1.347 djm 1789:
1790: /* Various special cases. */
1.350 djm 1791: int complex_hostspec; /* wildcard or manual pattern-list host name */
1.347 djm 1792: int ca_available; /* saw CA key for this host */
1.352 djm 1793: int old_key_seen; /* saw old key with other name/addr */
1.353 djm 1794: int other_name_seen; /* saw key with other name/addr */
1.269 djm 1795: };
1796:
1797: static void
1798: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1799: {
1800: size_t i;
1801:
1802: if (ctx == NULL)
1803: return;
1804: for (i = 0; i < ctx->nkeys; i++)
1805: sshkey_free(ctx->keys[i]);
1806: free(ctx->keys);
1.351 djm 1807: free(ctx->keys_match);
1808: free(ctx->keys_verified);
1.269 djm 1809: for (i = 0; i < ctx->nold; i++)
1810: sshkey_free(ctx->old_keys[i]);
1811: free(ctx->old_keys);
1812: free(ctx->host_str);
1813: free(ctx->ip_str);
1814: free(ctx);
1815: }
1816:
1.350 djm 1817: /*
1818: * Returns non-zero if a known_hosts hostname list is not of a form that
1819: * can be handled by UpdateHostkeys. These include wildcard hostnames and
1820: * hostnames lists that do not follow the form host[,ip].
1821: */
1822: static int
1823: hostspec_is_complex(const char *hosts)
1824: {
1825: char *cp;
1826:
1827: /* wildcard */
1828: if (strchr(hosts, '*') != NULL || strchr(hosts, '?') != NULL)
1829: return 1;
1830: /* single host/ip = ok */
1831: if ((cp = strchr(hosts, ',')) == NULL)
1832: return 0;
1833: /* more than two entries on the line */
1834: if (strchr(cp + 1, ',') != NULL)
1835: return 1;
1836: /* XXX maybe parse cp+1 and ensure it is an IP? */
1837: return 0;
1838: }
1839:
1.352 djm 1840: /* callback to search for ctx->keys in known_hosts */
1.269 djm 1841: static int
1842: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1843: {
1844: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1845: size_t i;
1846: struct sshkey **tmp;
1847:
1.353 djm 1848: if (l->key == NULL)
1.269 djm 1849: return 0;
1.353 djm 1850: if (l->status != HKF_STATUS_MATCHED) {
1851: /* Record if one of the keys appears on a non-matching line */
1852: for (i = 0; i < ctx->nkeys; i++) {
1853: if (sshkey_equal(l->key, ctx->keys[i])) {
1854: ctx->other_name_seen = 1;
1.354 djm 1855: debug3_f("found %s key under different "
1856: "name/addr at %s:%ld",
1.353 djm 1857: sshkey_ssh_name(ctx->keys[i]),
1858: l->path, l->linenum);
1859: return 0;
1860: }
1861: }
1862: return 0;
1863: }
1864: /* Don't proceed if revocation or CA markers are present */
1865: /* XXX relax this */
1866: if (l->marker != MRK_NONE) {
1.354 djm 1867: debug3_f("hostkeys file %s:%ld has CA/revocation marker",
1868: l->path, l->linenum);
1.353 djm 1869: ctx->complex_hostspec = 1;
1870: return 0;
1871: }
1872:
1.355 djm 1873: /* If CheckHostIP is enabled, then check for mismatched hostname/addr */
1874: if (ctx->ip_str != NULL && strchr(l->hosts, ',') != NULL) {
1875: if ((l->match & HKF_MATCH_HOST) == 0) {
1876: /* Record if address matched a different hostname. */
1877: ctx->other_name_seen = 1;
1878: debug3_f("found address %s against different hostname "
1879: "at %s:%ld", ctx->ip_str, l->path, l->linenum);
1880: return 0;
1881: } else if ((l->match & HKF_MATCH_IP) == 0) {
1882: /* Record if hostname matched a different address. */
1883: ctx->other_name_seen = 1;
1884: debug3_f("found hostname %s against different address "
1885: "at %s:%ld", ctx->host_str, l->path, l->linenum);
1886: }
1.353 djm 1887: }
1.269 djm 1888:
1.350 djm 1889: /*
1890: * UpdateHostkeys is skipped for wildcard host names and hostnames
1891: * that contain more than two entries (ssh never writes these).
1892: */
1893: if (hostspec_is_complex(l->hosts)) {
1.354 djm 1894: debug3_f("hostkeys file %s:%ld complex host specification",
1895: l->path, l->linenum);
1.350 djm 1896: ctx->complex_hostspec = 1;
1.347 djm 1897: return 0;
1898: }
1899:
1.269 djm 1900: /* Mark off keys we've already seen for this host */
1901: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 1902: if (!sshkey_equal(l->key, ctx->keys[i]))
1903: continue;
1.354 djm 1904: debug3_f("found %s key at %s:%ld",
1.351 djm 1905: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1906: ctx->keys_match[i] |= l->match;
1907: return 0;
1.269 djm 1908: }
1909: /* This line contained a key that not offered by the server */
1.354 djm 1910: debug3_f("deprecated %s key at %s:%ld", sshkey_ssh_name(l->key),
1911: l->path, l->linenum);
1.299 deraadt 1912: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1913: sizeof(*ctx->old_keys))) == NULL)
1.354 djm 1914: fatal_f("recallocarray failed nold = %zu", ctx->nold);
1.269 djm 1915: ctx->old_keys = tmp;
1916: ctx->old_keys[ctx->nold++] = l->key;
1917: l->key = NULL;
1918:
1919: return 0;
1920: }
1921:
1.352 djm 1922: /* callback to search for ctx->old_keys in known_hosts under other names */
1923: static int
1924: hostkeys_check_old(struct hostkey_foreach_line *l, void *_ctx)
1925: {
1926: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1927: size_t i;
1928: int hashed;
1929:
1930: /* only care about lines that *don't* match the active host spec */
1931: if (l->status == HKF_STATUS_MATCHED || l->key == NULL)
1932: return 0;
1933:
1934: hashed = l->match & (HKF_MATCH_HOST_HASHED|HKF_MATCH_IP_HASHED);
1935: for (i = 0; i < ctx->nold; i++) {
1936: if (!sshkey_equal(l->key, ctx->old_keys[i]))
1937: continue;
1.354 djm 1938: debug3_f("found deprecated %s key at %s:%ld as %s",
1.364 djm 1939: sshkey_ssh_name(ctx->old_keys[i]), l->path, l->linenum,
1.352 djm 1940: hashed ? "[HASHED]" : l->hosts);
1941: ctx->old_key_seen = 1;
1942: break;
1943: }
1944: return 0;
1945: }
1946:
1947: /*
1948: * Check known_hosts files for deprecated keys under other names. Returns 0
1949: * on success or -1 on failure. Updates ctx->old_key_seen if deprecated keys
1950: * exist under names other than the active hostname/IP.
1951: */
1952: static int
1953: check_old_keys_othernames(struct hostkeys_update_ctx *ctx)
1954: {
1955: size_t i;
1956: int r;
1957:
1.354 djm 1958: debug2_f("checking for %zu deprecated keys", ctx->nold);
1.352 djm 1959: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 1960: debug3_f("searching %s for %s / %s",
1.352 djm 1961: options.user_hostfiles[i], ctx->host_str,
1962: ctx->ip_str ? ctx->ip_str : "(none)");
1963: if ((r = hostkeys_foreach(options.user_hostfiles[i],
1964: hostkeys_check_old, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 1965: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.352 djm 1966: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 1967: debug_f("hostkeys file %s does not exist",
1968: options.user_hostfiles[i]);
1.352 djm 1969: continue;
1970: }
1.354 djm 1971: error_fr(r, "hostkeys_foreach failed for %s",
1972: options.user_hostfiles[i]);
1.352 djm 1973: return -1;
1974: }
1975: }
1976: return 0;
1977: }
1978:
1.269 djm 1979: static void
1.337 djm 1980: hostkey_change_preamble(LogLevel loglevel)
1.269 djm 1981: {
1.336 djm 1982: do_log2(loglevel, "The server has updated its host keys.");
1983: do_log2(loglevel, "These changes were verified by the server's "
1984: "existing trusted key.");
1985: }
1986:
1987: static void
1988: update_known_hosts(struct hostkeys_update_ctx *ctx)
1989: {
1990: int r, was_raw = 0, first = 1;
1991: int asking = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK;
1992: LogLevel loglevel = asking ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1.269 djm 1993: char *fp, *response;
1994: size_t i;
1.333 djm 1995: struct stat sb;
1.269 djm 1996:
1997: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 1998: if (!ctx->keys_verified[i])
1.269 djm 1999: continue;
2000: if ((fp = sshkey_fingerprint(ctx->keys[i],
2001: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2002: fatal_f("sshkey_fingerprint failed");
1.336 djm 2003: if (first && asking)
1.337 djm 2004: hostkey_change_preamble(loglevel);
1.269 djm 2005: do_log2(loglevel, "Learned new hostkey: %s %s",
2006: sshkey_type(ctx->keys[i]), fp);
1.336 djm 2007: first = 0;
1.269 djm 2008: free(fp);
2009: }
2010: for (i = 0; i < ctx->nold; i++) {
2011: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2012: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2013: fatal_f("sshkey_fingerprint failed");
1.336 djm 2014: if (first && asking)
1.337 djm 2015: hostkey_change_preamble(loglevel);
1.269 djm 2016: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2017: sshkey_type(ctx->old_keys[i]), fp);
1.336 djm 2018: first = 0;
1.269 djm 2019: free(fp);
2020: }
2021: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2022: if (get_saved_tio() != NULL) {
2023: leave_raw_mode(1);
2024: was_raw = 1;
2025: }
1.269 djm 2026: response = NULL;
2027: for (i = 0; !quit_pending && i < 3; i++) {
2028: free(response);
2029: response = read_passphrase("Accept updated hostkeys? "
2030: "(yes/no): ", RP_ECHO);
2031: if (strcasecmp(response, "yes") == 0)
2032: break;
2033: else if (quit_pending || response == NULL ||
2034: strcasecmp(response, "no") == 0) {
2035: options.update_hostkeys = 0;
2036: break;
2037: } else {
2038: do_log2(loglevel, "Please enter "
2039: "\"yes\" or \"no\"");
2040: }
2041: }
2042: if (quit_pending || i >= 3 || response == NULL)
2043: options.update_hostkeys = 0;
2044: free(response);
1.271 djm 2045: if (was_raw)
2046: enter_raw_mode(1);
1.269 djm 2047: }
1.333 djm 2048: if (options.update_hostkeys == 0)
2049: return;
1.269 djm 2050: /*
2051: * Now that all the keys are verified, we can go ahead and replace
2052: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2053: * cancel the operation).
2054: */
1.333 djm 2055: for (i = 0; i < options.num_user_hostfiles; i++) {
2056: /*
2057: * NB. keys are only added to hostfiles[0], for the rest we
2058: * just delete the hostname entries.
2059: */
2060: if (stat(options.user_hostfiles[i], &sb) != 0) {
2061: if (errno == ENOENT) {
1.354 djm 2062: debug_f("known hosts file %s does not "
2063: "exist", options.user_hostfiles[i]);
1.333 djm 2064: } else {
1.354 djm 2065: error_f("known hosts file %s "
2066: "inaccessible: %s",
2067: options.user_hostfiles[i], strerror(errno));
1.333 djm 2068: }
2069: continue;
2070: }
2071: if ((r = hostfile_replace_entries(options.user_hostfiles[i],
2072: ctx->host_str, ctx->ip_str,
2073: i == 0 ? ctx->keys : NULL, i == 0 ? ctx->nkeys : 0,
2074: options.hash_known_hosts, 0,
2075: options.fingerprint_hash)) != 0) {
1.354 djm 2076: error_fr(r, "hostfile_replace_entries failed for %s",
2077: options.user_hostfiles[i]);
1.333 djm 2078: }
2079: }
1.269 djm 2080: }
2081:
2082: static void
1.303 djm 2083: client_global_hostkeys_private_confirm(struct ssh *ssh, int type,
2084: u_int32_t seq, void *_ctx)
1.269 djm 2085: {
2086: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2087: size_t i, ndone;
2088: struct sshbuf *signdata;
1.309 djm 2089: int r, kexsigtype, use_kexsigtype;
1.269 djm 2090: const u_char *sig;
2091: size_t siglen;
2092:
2093: if (ctx->nnew == 0)
1.354 djm 2094: fatal_f("ctx->nnew == 0"); /* sanity */
1.269 djm 2095: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2096: error("Server failed to confirm ownership of "
2097: "private host keys");
2098: hostkeys_update_ctx_free(ctx);
2099: return;
2100: }
1.309 djm 2101: kexsigtype = sshkey_type_plain(
2102: sshkey_type_from_name(ssh->kex->hostkey_alg));
2103:
1.269 djm 2104: if ((signdata = sshbuf_new()) == NULL)
1.354 djm 2105: fatal_f("sshbuf_new failed");
1.269 djm 2106: /*
2107: * Expect a signature for each of the ctx->nnew private keys we
2108: * haven't seen before. They will be in the same order as the
1.351 djm 2109: * ctx->keys where the corresponding ctx->keys_match[i] == 0.
1.269 djm 2110: */
2111: for (ndone = i = 0; i < ctx->nkeys; i++) {
1.351 djm 2112: if (ctx->keys_match[i])
1.269 djm 2113: continue;
2114: /* Prepare data to be signed: session ID, unique string, key */
2115: sshbuf_reset(signdata);
1.270 djm 2116: if ( (r = sshbuf_put_cstring(signdata,
2117: "hostkeys-prove-00@openssh.com")) != 0 ||
1.358 djm 2118: (r = sshbuf_put_stringb(signdata,
2119: ssh->kex->session_id)) != 0 ||
1.269 djm 2120: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1.354 djm 2121: fatal_fr(r, "compose signdata");
1.269 djm 2122: /* Extract and verify signature */
2123: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1.354 djm 2124: error_fr(r, "parse sig");
1.269 djm 2125: goto out;
2126: }
1.309 djm 2127: /*
2128: * For RSA keys, prefer to use the signature type negotiated
2129: * during KEX to the default (SHA1).
2130: */
2131: use_kexsigtype = kexsigtype == KEY_RSA &&
2132: sshkey_type_plain(ctx->keys[i]->type) == KEY_RSA;
1.361 djm 2133: debug3_f("verify %s key %zu using %s sigalg",
2134: sshkey_type(ctx->keys[i]), i,
1.362 dtucker 2135: use_kexsigtype ? ssh->kex->hostkey_alg : "default");
1.269 djm 2136: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 2137: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.329 djm 2138: use_kexsigtype ? ssh->kex->hostkey_alg : NULL, 0,
2139: NULL)) != 0) {
1.361 djm 2140: error_fr(r, "server gave bad signature for %s key %zu",
1.354 djm 2141: sshkey_type(ctx->keys[i]), i);
1.269 djm 2142: goto out;
2143: }
2144: /* Key is good. Mark it as 'seen' */
1.351 djm 2145: ctx->keys_verified[i] = 1;
1.269 djm 2146: ndone++;
2147: }
1.354 djm 2148: /* Shouldn't happen */
1.269 djm 2149: if (ndone != ctx->nnew)
1.354 djm 2150: fatal_f("ndone != ctx->nnew (%zu / %zu)", ndone, ctx->nnew);
1.320 djm 2151: if ((r = sshpkt_get_end(ssh)) != 0) {
1.354 djm 2152: error_f("protocol error");
1.320 djm 2153: goto out;
2154: }
1.269 djm 2155:
2156: /* Make the edits to known_hosts */
2157: update_known_hosts(ctx);
2158: out:
2159: hostkeys_update_ctx_free(ctx);
2160: }
2161:
1.267 djm 2162: /*
1.291 djm 2163: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
2164: * Made slightly less trivial by the multiple RSA signature algorithm names.
2165: */
2166: static int
2167: key_accepted_by_hostkeyalgs(const struct sshkey *key)
2168: {
2169: const char *ktype = sshkey_ssh_name(key);
1.331 dtucker 2170: const char *hostkeyalgs = options.hostkeyalgorithms;
1.291 djm 2171:
2172: if (key == NULL || key->type == KEY_UNSPEC)
2173: return 0;
2174: if (key->type == KEY_RSA &&
2175: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
2176: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
2177: return 1;
2178: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
2179: }
2180:
2181: /*
1.270 djm 2182: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2183: * the server's hostkeys. The keys are checked against the user's
2184: * HostkeyAlgorithms preference before they are accepted.
2185: */
2186: static int
1.321 djm 2187: client_input_hostkeys(struct ssh *ssh)
1.267 djm 2188: {
2189: const u_char *blob = NULL;
1.269 djm 2190: size_t i, len = 0;
1.267 djm 2191: struct sshbuf *buf = NULL;
1.269 djm 2192: struct sshkey *key = NULL, **tmp;
2193: int r;
2194: char *fp;
1.267 djm 2195: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2196: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2197: struct hostkeys_update_ctx *ctx = NULL;
1.351 djm 2198: u_int want;
1.267 djm 2199:
2200: if (hostkeys_seen)
1.354 djm 2201: fatal_f("server already sent hostkeys");
1.269 djm 2202: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2203: options.batch_mode)
2204: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2205: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2206: return 1;
1.272 djm 2207:
2208: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2209: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2210: sshkey_free(key);
2211: key = NULL;
1.269 djm 2212: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
1.354 djm 2213: error_fr(r, "parse key");
1.269 djm 2214: goto out;
2215: }
1.270 djm 2216: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
1.354 djm 2217: do_log2_fr(r, r == SSH_ERR_KEY_TYPE_UNKNOWN ?
1.335 djm 2218: SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR,
1.354 djm 2219: "convert key");
1.335 djm 2220: continue;
1.270 djm 2221: }
1.267 djm 2222: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2223: SSH_FP_DEFAULT);
1.354 djm 2224: debug3_f("received %s key %s", sshkey_type(key), fp);
1.267 djm 2225: free(fp);
1.275 markus 2226:
1.291 djm 2227: if (!key_accepted_by_hostkeyalgs(key)) {
1.354 djm 2228: debug3_f("%s key not permitted by "
2229: "HostkeyAlgorithms", sshkey_ssh_name(key));
1.267 djm 2230: continue;
2231: }
1.269 djm 2232: /* Skip certs */
2233: if (sshkey_is_cert(key)) {
1.354 djm 2234: debug3_f("%s key is a certificate; skipping",
2235: sshkey_ssh_name(key));
1.269 djm 2236: continue;
2237: }
2238: /* Ensure keys are unique */
2239: for (i = 0; i < ctx->nkeys; i++) {
2240: if (sshkey_equal(key, ctx->keys[i])) {
1.354 djm 2241: error_f("received duplicated %s host key",
2242: sshkey_ssh_name(key));
1.269 djm 2243: goto out;
2244: }
2245: }
2246: /* Key is good, record it */
1.299 deraadt 2247: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2248: sizeof(*ctx->keys))) == NULL)
1.354 djm 2249: fatal_f("recallocarray failed nkeys = %zu",
2250: ctx->nkeys);
1.269 djm 2251: ctx->keys = tmp;
2252: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2253: key = NULL;
2254: }
2255:
1.269 djm 2256: if (ctx->nkeys == 0) {
1.354 djm 2257: debug_f("server sent no hostkeys");
1.267 djm 2258: goto out;
2259: }
1.270 djm 2260:
1.351 djm 2261: if ((ctx->keys_match = calloc(ctx->nkeys,
2262: sizeof(*ctx->keys_match))) == NULL ||
2263: (ctx->keys_verified = calloc(ctx->nkeys,
2264: sizeof(*ctx->keys_verified))) == NULL)
1.354 djm 2265: fatal_f("calloc failed");
1.267 djm 2266:
1.268 djm 2267: get_hostfile_hostname_ipaddr(host,
2268: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2269: options.port, &ctx->host_str,
2270: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2271:
1.269 djm 2272: /* Find which keys we already know about. */
1.333 djm 2273: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2274: debug_f("searching %s for %s / %s",
1.339 dtucker 2275: options.user_hostfiles[i], ctx->host_str,
1.340 dtucker 2276: ctx->ip_str ? ctx->ip_str : "(none)");
1.333 djm 2277: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2278: hostkeys_find, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2279: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.333 djm 2280: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2281: debug_f("hostkeys file %s does not exist",
2282: options.user_hostfiles[i]);
1.333 djm 2283: continue;
2284: }
1.354 djm 2285: error_fr(r, "hostkeys_foreach failed for %s",
2286: options.user_hostfiles[i]);
1.333 djm 2287: goto out;
2288: }
1.267 djm 2289: }
2290:
1.269 djm 2291: /* Figure out if we have any new keys to add */
1.351 djm 2292: ctx->nnew = ctx->nincomplete = 0;
2293: want = HKF_MATCH_HOST | ( options.check_host_ip ? HKF_MATCH_IP : 0);
1.269 djm 2294: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2295: if (ctx->keys_match[i] == 0)
1.269 djm 2296: ctx->nnew++;
1.351 djm 2297: if ((ctx->keys_match[i] & want) != want)
2298: ctx->nincomplete++;
1.269 djm 2299: }
2300:
1.354 djm 2301: debug3_f("%zu server keys: %zu new, %zu retained, "
2302: "%zu incomplete match. %zu to remove", ctx->nkeys, ctx->nnew,
2303: ctx->nkeys - ctx->nnew - ctx->nincomplete,
1.351 djm 2304: ctx->nincomplete, ctx->nold);
1.269 djm 2305:
1.353 djm 2306: if (ctx->nnew == 0 && ctx->nold == 0) {
1.354 djm 2307: debug_f("no new or deprecated keys from server");
1.353 djm 2308: goto out;
2309: }
2310:
2311: /* Various reasons why we cannot proceed with the update */
2312: if (ctx->complex_hostspec) {
1.354 djm 2313: debug_f("CA/revocation marker, manual host list or wildcard "
2314: "host pattern found, skipping UserKnownHostsFile update");
1.353 djm 2315: goto out;
2316: }
2317: if (ctx->other_name_seen) {
1.354 djm 2318: debug_f("host key found matching a different name/address, "
2319: "skipping UserKnownHostsFile update");
1.347 djm 2320: goto out;
1.352 djm 2321: }
2322: /*
2323: * If removing keys, check whether they appear under different
2324: * names/addresses and refuse to proceed if they do. This avoids
2325: * cases such as hosts with multiple names becoming inconsistent
2326: * with regards to CheckHostIP entries.
2327: * XXX UpdateHostkeys=force to override this (and other) checks?
2328: */
2329: if (ctx->nold != 0) {
2330: if (check_old_keys_othernames(ctx) != 0)
2331: goto out; /* error already logged */
2332: if (ctx->old_key_seen) {
1.354 djm 2333: debug_f("key(s) for %s%s%s exist under other names; "
2334: "skipping UserKnownHostsFile update",
1.352 djm 2335: ctx->host_str, ctx->ip_str == NULL ? "" : ",",
2336: ctx->ip_str == NULL ? "" : ctx->ip_str);
2337: goto out;
2338: }
2339: }
2340:
1.353 djm 2341: if (ctx->nnew == 0) {
1.351 djm 2342: /*
2343: * We have some keys to remove or fix matching for.
2344: * We can proceed to do this without requiring a fresh proof
2345: * from the server.
2346: */
1.269 djm 2347: update_known_hosts(ctx);
1.353 djm 2348: goto out;
2349: }
2350: /*
2351: * We have received previously-unseen keys from the server.
2352: * Ask the server to confirm ownership of the private halves.
2353: */
1.354 djm 2354: debug3_f("asking server to prove ownership for %zu keys", ctx->nnew);
1.353 djm 2355: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2356: (r = sshpkt_put_cstring(ssh,
2357: "hostkeys-prove-00@openssh.com")) != 0 ||
2358: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
1.354 djm 2359: fatal_fr(r, "prepare hostkeys-prove");
1.353 djm 2360: if ((buf = sshbuf_new()) == NULL)
1.354 djm 2361: fatal_f("sshbuf_new");
1.353 djm 2362: for (i = 0; i < ctx->nkeys; i++) {
2363: if (ctx->keys_match[i])
2364: continue;
2365: sshbuf_reset(buf);
2366: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0 ||
1.354 djm 2367: (r = sshpkt_put_stringb(ssh, buf)) != 0)
2368: fatal_fr(r, "assemble hostkeys-prove");
1.269 djm 2369: }
1.353 djm 2370: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2371: fatal_fr(r, "send hostkeys-prove");
1.353 djm 2372: client_register_global_confirm(
2373: client_global_hostkeys_private_confirm, ctx);
2374: ctx = NULL; /* will be freed in callback */
1.269 djm 2375:
1.267 djm 2376: /* Success */
2377: out:
1.269 djm 2378: hostkeys_update_ctx_free(ctx);
1.267 djm 2379: sshkey_free(key);
2380: sshbuf_free(buf);
1.269 djm 2381: /*
2382: * NB. Return success for all cases. The server doesn't need to know
2383: * what the client does with its hosts file.
2384: */
2385: return 1;
1.267 djm 2386: }
2387:
1.264 markus 2388: static int
1.297 markus 2389: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2390: {
2391: char *rtype;
1.320 djm 2392: u_char want_reply;
2393: int r, success = 0;
1.95 markus 2394:
1.320 djm 2395: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
2396: (r = sshpkt_get_u8(ssh, &want_reply)) != 0)
2397: goto out;
1.117 markus 2398: debug("client_input_global_request: rtype %s want_reply %d",
2399: rtype, want_reply);
1.270 djm 2400: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.321 djm 2401: success = client_input_hostkeys(ssh);
1.95 markus 2402: if (want_reply) {
1.320 djm 2403: if ((r = sshpkt_start(ssh, success ? SSH2_MSG_REQUEST_SUCCESS :
2404: SSH2_MSG_REQUEST_FAILURE)) != 0 ||
2405: (r = sshpkt_send(ssh)) != 0 ||
2406: (r = ssh_packet_write_wait(ssh)) != 0)
2407: goto out;
1.95 markus 2408: }
1.320 djm 2409: r = 0;
2410: out:
1.250 djm 2411: free(rtype);
1.320 djm 2412: return r;
1.95 markus 2413: }
1.22 markus 2414:
1.354 djm 2415: static void
2416: client_send_env(struct ssh *ssh, int id, const char *name, const char *val)
2417: {
2418: int r;
2419:
2420: debug("channel %d: setting env %s = \"%s\"", id, name, val);
2421: channel_request_start(ssh, id, "env", 0);
2422: if ((r = sshpkt_put_cstring(ssh, name)) != 0 ||
2423: (r = sshpkt_put_cstring(ssh, val)) != 0 ||
2424: (r = sshpkt_send(ssh)) != 0)
2425: fatal_fr(r, "send setenv");
2426: }
2427:
1.123 djm 2428: void
1.303 djm 2429: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.315 markus 2430: const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd,
2431: char **env)
1.123 djm 2432: {
1.320 djm 2433: int i, j, matched, len, r;
1.313 djm 2434: char *name, *val;
1.132 djm 2435: Channel *c = NULL;
1.123 djm 2436:
1.354 djm 2437: debug2_f("id %d", id);
1.123 djm 2438:
1.303 djm 2439: if ((c = channel_lookup(ssh, id)) == NULL)
1.354 djm 2440: fatal_f("channel %d: unknown channel", id);
1.224 djm 2441:
1.320 djm 2442: ssh_packet_set_interactive(ssh, want_tty,
1.224 djm 2443: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2444:
1.123 djm 2445: if (want_tty) {
2446: struct winsize ws;
2447:
2448: /* Store window size in the packet. */
1.326 deraadt 2449: if (ioctl(in_fd, TIOCGWINSZ, &ws) == -1)
1.123 djm 2450: memset(&ws, 0, sizeof(ws));
2451:
1.303 djm 2452: channel_request_start(ssh, id, "pty-req", 1);
2453: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.320 djm 2454: if ((r = sshpkt_put_cstring(ssh, term != NULL ? term : ""))
2455: != 0 ||
2456: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
2457: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
2458: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
2459: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0)
1.354 djm 2460: fatal_fr(r, "build pty-req");
1.194 djm 2461: if (tiop == NULL)
2462: tiop = get_saved_tio();
1.316 markus 2463: ssh_tty_make_modes(ssh, -1, tiop);
1.320 djm 2464: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2465: fatal_fr(r, "send pty-req");
1.123 djm 2466: /* XXX wait for reply */
1.132 djm 2467: c->client_tty = 1;
1.123 djm 2468: }
2469:
2470: /* Transfer any environment variables from client to server */
1.126 djm 2471: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2472: debug("Sending environment.");
1.126 djm 2473: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2474: /* Split */
1.126 djm 2475: name = xstrdup(env[i]);
1.123 djm 2476: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2477: free(name);
1.123 djm 2478: continue;
2479: }
2480: *val++ = '\0';
2481:
2482: matched = 0;
2483: for (j = 0; j < options.num_send_env; j++) {
2484: if (match_pattern(name, options.send_env[j])) {
2485: matched = 1;
2486: break;
2487: }
2488: }
2489: if (!matched) {
2490: debug3("Ignored env %s", name);
1.250 djm 2491: free(name);
1.123 djm 2492: continue;
2493: }
1.354 djm 2494: client_send_env(ssh, id, name, val);
1.250 djm 2495: free(name);
1.123 djm 2496: }
1.313 djm 2497: }
2498: for (i = 0; i < options.num_setenv; i++) {
2499: /* Split */
2500: name = xstrdup(options.setenv[i]);
2501: if ((val = strchr(name, '=')) == NULL) {
2502: free(name);
2503: continue;
2504: }
2505: *val++ = '\0';
1.354 djm 2506: client_send_env(ssh, id, name, val);
1.313 djm 2507: free(name);
1.123 djm 2508: }
2509:
1.315 markus 2510: len = sshbuf_len(cmd);
1.123 djm 2511: if (len > 0) {
2512: if (len > 900)
2513: len = 900;
2514: if (want_subsystem) {
1.190 djm 2515: debug("Sending subsystem: %.*s",
1.315 markus 2516: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2517: channel_request_start(ssh, id, "subsystem", 1);
2518: client_expect_confirm(ssh, id, "subsystem",
2519: CONFIRM_CLOSE);
1.123 djm 2520: } else {
1.190 djm 2521: debug("Sending command: %.*s",
1.315 markus 2522: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2523: channel_request_start(ssh, id, "exec", 1);
2524: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2525: }
1.320 djm 2526: if ((r = sshpkt_put_stringb(ssh, cmd)) != 0 ||
2527: (r = sshpkt_send(ssh)) != 0)
1.354 djm 2528: fatal_fr(r, "send command");
1.123 djm 2529: } else {
1.303 djm 2530: channel_request_start(ssh, id, "shell", 1);
2531: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.354 djm 2532: if ((r = sshpkt_send(ssh)) != 0)
2533: fatal_fr(r, "send shell");
1.123 djm 2534: }
2535: }
2536:
1.77 itojun 2537: static void
1.321 djm 2538: client_init_dispatch(struct ssh *ssh)
1.16 markus 2539: {
1.321 djm 2540: ssh_dispatch_init(ssh, &dispatch_protocol_error);
1.100 markus 2541:
1.321 djm 2542: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2543: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2544: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2545: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2546: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2547: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2548: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2549: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2550: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2551: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2552: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2553: ssh_dispatch_set(ssh, SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2554:
2555: /* rekeying */
1.321 djm 2556: ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2557:
2558: /* global request reply messages */
1.321 djm 2559: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2560: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2561: }
2562:
2563: void
2564: client_stop_mux(void)
2565: {
2566: if (options.control_path != NULL && muxserver_sock != -1)
2567: unlink(options.control_path);
2568: /*
1.247 dtucker 2569: * If we are in persist mode, or don't have a shell, signal that we
2570: * should close when all active channels are closed.
1.232 djm 2571: */
1.366 djm 2572: if (options.control_persist || options.session_type == SESSION_TYPE_NONE) {
1.232 djm 2573: session_closed = 1;
1.235 djm 2574: setproctitle("[stopped mux]");
2575: }
1.113 markus 2576: }
2577:
2578: /* client specific fatal cleanup */
2579: void
1.114 markus 2580: cleanup_exit(int i)
1.113 markus 2581: {
1.233 djm 2582: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.192 djm 2583: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2584: unlink(options.control_path);
1.223 djm 2585: ssh_kill_proxy_command();
1.114 markus 2586: _exit(i);
1.1 deraadt 2587: }
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