Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.366
1.366 ! djm 1: /* $OpenBSD: clientloop.c,v 1.365 2021/07/05 01:21:07 dtucker 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;
110:
1.1 deraadt 111: /* Flag indicating that stdin should be redirected from /dev/null. */
112: extern int stdin_null_flag;
113:
1.286 djm 114: /* Flag indicating that ssh should daemonise after authentication is complete */
115: extern int fork_after_authentication_flag;
116:
1.123 djm 117: /* Control socket */
1.217 djm 118: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 119:
1.13 markus 120: /*
121: * Name of the host we are connecting to. This is the name given on the
1.324 jmc 122: * command line, or the Hostname specified for the user-supplied name in a
1.13 markus 123: * configuration file.
124: */
1.1 deraadt 125: extern char *host;
126:
1.13 markus 127: /*
1.330 djm 128: * If this field is not NULL, the ForwardAgent socket is this path and different
129: * instead of SSH_AUTH_SOCK.
130: */
131: extern char *forward_agent_sock_path;
132:
133: /*
1.13 markus 134: * Flag to indicate that we have received a window change signal which has
135: * not yet been processed. This will cause a message indicating the new
136: * window size to be sent to the server a little later. This is volatile
137: * because this is updated in a signal handler.
138: */
1.88 markus 139: static volatile sig_atomic_t received_window_change_signal = 0;
140: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 141:
1.222 djm 142: /* Time when backgrounded control master using ControlPersist should exit */
143: static time_t control_persist_exit_time = 0;
144:
1.1 deraadt 145: /* Common data for the client loop code. */
1.217 djm 146: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.11 markus 147: static int last_was_cr; /* Last character was a newline. */
1.197 djm 148: static int exit_status; /* Used to store the command exit status. */
1.315 markus 149: static struct sshbuf *stderr_buffer; /* Used for final exit message. */
1.11 markus 150: static int connection_in; /* Connection to server (input). */
151: static int connection_out; /* Connection to server (output). */
1.56 markus 152: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 153: static int session_closed; /* In SSH2: login session closed. */
1.274 djm 154: static u_int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.345 dtucker 155: static time_t server_alive_time; /* Time to do server_alive_check */
1.1 deraadt 156:
1.321 djm 157: static void client_init_dispatch(struct ssh *ssh);
1.16 markus 158: int session_ident = -1;
159:
1.195 djm 160: /* Track escape per proto2 channel */
161: struct escape_filter_ctx {
162: int escape_pending;
163: int escape_char;
164: };
165:
166: /* Context for channel confirmation replies */
1.190 djm 167: struct channel_reply_ctx {
168: const char *request_type;
1.234 djm 169: int id;
170: enum confirm_action action;
1.190 djm 171: };
172:
1.196 djm 173: /* Global request success/failure callbacks */
1.303 djm 174: /* XXX move to struct ssh? */
1.196 djm 175: struct global_confirm {
176: TAILQ_ENTRY(global_confirm) entry;
177: global_confirm_cb *cb;
178: void *ctx;
179: int ref_count;
180: };
181: TAILQ_HEAD(global_confirms, global_confirm);
182: static struct global_confirms global_confirms =
183: TAILQ_HEAD_INITIALIZER(global_confirms);
184:
1.315 markus 185: void ssh_process_session2_setup(int, int, int, struct sshbuf *);
1.123 djm 186:
1.13 markus 187: /*
188: * Signal handler for the window change signal (SIGWINCH). This just sets a
189: * flag indicating that the window has changed.
190: */
1.157 deraadt 191: /*ARGSUSED */
1.77 itojun 192: static void
1.11 markus 193: window_change_handler(int sig)
1.1 deraadt 194: {
1.11 markus 195: received_window_change_signal = 1;
1.1 deraadt 196: }
197:
1.13 markus 198: /*
199: * Signal handler for signals that cause the program to terminate. These
200: * signals must be trapped to restore terminal modes.
201: */
1.157 deraadt 202: /*ARGSUSED */
1.77 itojun 203: static void
1.11 markus 204: signal_handler(int sig)
1.1 deraadt 205: {
1.75 markus 206: received_signal = sig;
207: quit_pending = 1;
1.1 deraadt 208: }
209:
1.13 markus 210: /*
1.222 djm 211: * Sets control_persist_exit_time to the absolute time when the
212: * backgrounded control master should exit due to expiry of the
213: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
214: * control master process, or if there is no ControlPersist timeout.
215: */
216: static void
1.303 djm 217: set_control_persist_exit_time(struct ssh *ssh)
1.222 djm 218: {
219: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 220: || options.control_persist_timeout == 0) {
1.222 djm 221: /* not using a ControlPersist timeout */
222: control_persist_exit_time = 0;
1.303 djm 223: } else if (channel_still_open(ssh)) {
1.222 djm 224: /* some client connections are still open */
225: if (control_persist_exit_time > 0)
1.354 djm 226: debug2_f("cancel scheduled exit");
1.222 djm 227: control_persist_exit_time = 0;
228: } else if (control_persist_exit_time <= 0) {
229: /* a client connection has recently closed */
1.251 dtucker 230: control_persist_exit_time = monotime() +
1.222 djm 231: (time_t)options.control_persist_timeout;
1.354 djm 232: debug2_f("schedule exit in %d seconds",
1.222 djm 233: options.control_persist_timeout);
234: }
235: /* else we are already counting down to the timeout */
236: }
237:
1.238 dtucker 238: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
239: static int
240: client_x11_display_valid(const char *display)
241: {
242: size_t i, dlen;
243:
1.279 djm 244: if (display == NULL)
245: return 0;
246:
1.238 dtucker 247: dlen = strlen(display);
248: for (i = 0; i < dlen; i++) {
1.256 deraadt 249: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 250: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
251: debug("Invalid character '%c' in DISPLAY", display[i]);
252: return 0;
253: }
254: }
255: return 1;
256: }
257:
1.274 djm 258: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
259: #define X11_TIMEOUT_SLACK 60
1.279 djm 260: int
1.303 djm 261: client_x11_get_proto(struct ssh *ssh, const char *display,
262: const char *xauth_path, u_int trusted, u_int timeout,
263: char **_proto, char **_data)
1.138 djm 264: {
1.318 djm 265: char *cmd, line[512], xdisplay[512];
1.279 djm 266: char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
1.138 djm 267: static char proto[512], data[512];
268: FILE *f;
1.288 tedu 269: int got_data = 0, generated = 0, do_unlink = 0, r;
1.138 djm 270: struct stat st;
1.274 djm 271: u_int now, x11_timeout_real;
1.138 djm 272:
273: *_proto = proto;
274: *_data = data;
1.279 djm 275: proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
1.138 djm 276:
1.279 djm 277: if (!client_x11_display_valid(display)) {
1.283 millert 278: if (display != NULL)
279: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
280: display);
1.279 djm 281: return -1;
282: }
283: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
1.138 djm 284: debug("No xauth program.");
1.279 djm 285: xauth_path = NULL;
286: }
287:
288: if (xauth_path != NULL) {
1.138 djm 289: /*
290: * Handle FamilyLocal case where $DISPLAY does
291: * not match an authorization entry. For this we
292: * just try "xauth list unix:displaynum.screennum".
293: * XXX: "localhost" match to determine FamilyLocal
294: * is not perfect.
295: */
296: if (strncmp(display, "localhost:", 10) == 0) {
1.279 djm 297: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
298: display + 10)) < 0 ||
299: (size_t)r >= sizeof(xdisplay)) {
1.354 djm 300: error_f("display name too long");
1.279 djm 301: return -1;
302: }
1.138 djm 303: display = xdisplay;
304: }
305: if (trusted == 0) {
1.274 djm 306: /*
1.279 djm 307: * Generate an untrusted X11 auth cookie.
308: *
1.274 djm 309: * The authentication cookie should briefly outlive
310: * ssh's willingness to forward X11 connections to
311: * avoid nasty fail-open behaviour in the X server.
312: */
1.279 djm 313: mktemp_proto(xauthdir, sizeof(xauthdir));
314: if (mkdtemp(xauthdir) == NULL) {
1.354 djm 315: error_f("mkdtemp: %s", strerror(errno));
1.279 djm 316: return -1;
317: }
318: do_unlink = 1;
319: if ((r = snprintf(xauthfile, sizeof(xauthfile),
320: "%s/xauthfile", xauthdir)) < 0 ||
321: (size_t)r >= sizeof(xauthfile)) {
1.354 djm 322: error_f("xauthfile path too long");
1.279 djm 323: rmdir(xauthdir);
324: return -1;
325: }
326:
1.318 djm 327: if (timeout == 0) {
328: /* auth doesn't time out */
329: xasprintf(&cmd, "%s -f %s generate %s %s "
330: "untrusted 2>%s",
331: xauth_path, xauthfile, display,
332: SSH_X11_PROTO, _PATH_DEVNULL);
333: } else {
334: /* Add some slack to requested expiry */
335: if (timeout < UINT_MAX - X11_TIMEOUT_SLACK)
336: x11_timeout_real = timeout +
337: X11_TIMEOUT_SLACK;
338: else {
339: /* Don't overflow on long timeouts */
340: x11_timeout_real = UINT_MAX;
341: }
342: xasprintf(&cmd, "%s -f %s generate %s %s "
343: "untrusted timeout %u 2>%s",
344: xauth_path, xauthfile, display,
345: SSH_X11_PROTO, x11_timeout_real,
346: _PATH_DEVNULL);
347: }
1.354 djm 348: debug2_f("xauth command: %s", cmd);
1.318 djm 349:
350: if (timeout != 0 && x11_refuse_time == 0) {
1.279 djm 351: now = monotime() + 1;
352: if (UINT_MAX - timeout < now)
353: x11_refuse_time = UINT_MAX;
354: else
355: x11_refuse_time = now + timeout;
1.303 djm 356: channel_set_x11_refuse_time(ssh,
357: x11_refuse_time);
1.138 djm 358: }
1.279 djm 359: if (system(cmd) == 0)
360: generated = 1;
1.318 djm 361: free(cmd);
1.138 djm 362: }
1.181 markus 363:
364: /*
365: * When in untrusted mode, we read the cookie only if it was
366: * successfully generated as an untrusted one in the step
367: * above.
368: */
369: if (trusted || generated) {
1.318 djm 370: xasprintf(&cmd,
1.181 markus 371: "%s %s%s list %s 2>" _PATH_DEVNULL,
372: xauth_path,
373: generated ? "-f " : "" ,
374: generated ? xauthfile : "",
375: display);
376: debug2("x11_get_proto: %s", cmd);
377: f = popen(cmd, "r");
378: if (f && fgets(line, sizeof(line), f) &&
379: sscanf(line, "%*s %511s %511s", proto, data) == 2)
380: got_data = 1;
381: if (f)
382: pclose(f);
1.318 djm 383: free(cmd);
1.279 djm 384: }
1.138 djm 385: }
386:
387: if (do_unlink) {
388: unlink(xauthfile);
389: rmdir(xauthdir);
390: }
391:
1.279 djm 392: /* Don't fall back to fake X11 data for untrusted forwarding */
393: if (!trusted && !got_data) {
394: error("Warning: untrusted X11 forwarding setup failed: "
395: "xauth key data not generated");
396: return -1;
397: }
398:
1.138 djm 399: /*
400: * If we didn't get authentication data, just make up some
401: * data. The forwarding code will check the validity of the
402: * response anyway, and substitute this data. The X11
403: * server, however, will ignore this fake data and use
404: * whatever authentication mechanisms it was using otherwise
405: * for the local connection.
406: */
407: if (!got_data) {
1.288 tedu 408: u_int8_t rnd[16];
409: u_int i;
1.138 djm 410:
411: logit("Warning: No xauth data; "
412: "using fake authentication data for X11 forwarding.");
413: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.288 tedu 414: arc4random_buf(rnd, sizeof(rnd));
415: for (i = 0; i < sizeof(rnd); i++) {
1.138 djm 416: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.288 tedu 417: rnd[i]);
1.138 djm 418: }
419: }
1.279 djm 420:
421: return 0;
1.1 deraadt 422: }
423:
1.13 markus 424: /*
425: * Checks if the client window has changed, and sends a packet about it to
426: * the server if so. The actual change is detected elsewhere (by a software
427: * interrupt on Unix); this just checks the flag and sends a message if
428: * appropriate.
429: */
1.1 deraadt 430:
1.77 itojun 431: static void
1.303 djm 432: client_check_window_change(struct ssh *ssh)
1.1 deraadt 433: {
1.292 djm 434: if (!received_window_change_signal)
1.16 markus 435: return;
436: received_window_change_signal = 0;
1.354 djm 437: debug2_f("changed");
1.303 djm 438: channel_send_window_changes(ssh);
1.1 deraadt 439: }
440:
1.264 markus 441: static int
1.297 markus 442: client_global_request_reply(int type, u_int32_t seq, struct ssh *ssh)
1.117 markus 443: {
1.196 djm 444: struct global_confirm *gc;
445:
446: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 447: return 0;
1.196 djm 448: if (gc->cb != NULL)
1.303 djm 449: gc->cb(ssh, type, seq, gc->ctx);
1.196 djm 450: if (--gc->ref_count <= 0) {
451: TAILQ_REMOVE(&global_confirms, gc, entry);
1.342 jsg 452: freezero(gc, sizeof(*gc));
1.196 djm 453: }
454:
1.320 djm 455: ssh_packet_set_alive_timeouts(ssh, 0);
1.264 markus 456: return 0;
1.117 markus 457: }
458:
459: static void
1.345 dtucker 460: schedule_server_alive_check(void)
461: {
462: if (options.server_alive_interval > 0)
463: server_alive_time = monotime() + options.server_alive_interval;
464: }
465:
466: static void
1.320 djm 467: server_alive_check(struct ssh *ssh)
1.117 markus 468: {
1.320 djm 469: int r;
470:
471: if (ssh_packet_inc_alive_timeouts(ssh) > options.server_alive_count_max) {
1.228 djm 472: logit("Timeout, server %s not responding.", host);
1.176 markus 473: cleanup_exit(255);
474: }
1.320 djm 475: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
476: (r = sshpkt_put_cstring(ssh, "keepalive@openssh.com")) != 0 ||
477: (r = sshpkt_put_u8(ssh, 1)) != 0 || /* boolean: want reply */
478: (r = sshpkt_send(ssh)) != 0)
1.354 djm 479: fatal_fr(r, "send packet");
1.196 djm 480: /* Insert an empty placeholder to maintain ordering */
481: client_register_global_confirm(NULL, NULL);
1.345 dtucker 482: schedule_server_alive_check();
1.117 markus 483: }
484:
1.13 markus 485: /*
486: * Waits until the client can do something (some data becomes available on
487: * one of the file descriptors).
488: */
1.77 itojun 489: static void
1.303 djm 490: client_wait_until_can_do_something(struct ssh *ssh,
491: fd_set **readsetp, fd_set **writesetp,
1.130 avsm 492: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 493: {
1.117 markus 494: struct timeval tv, *tvp;
1.222 djm 495: int timeout_secs;
1.345 dtucker 496: time_t minwait_secs = 0, now = monotime();
1.315 markus 497: int r, ret;
1.117 markus 498:
1.46 markus 499: /* Add any selections by the channel mechanism. */
1.321 djm 500: channel_prepare_select(ssh, readsetp, writesetp, maxfdp,
1.302 djm 501: nallocp, &minwait_secs);
1.11 markus 502:
1.292 djm 503: /* channel_prepare_select could have closed the last channel */
1.303 djm 504: if (session_closed && !channel_still_open(ssh) &&
1.320 djm 505: !ssh_packet_have_data_to_write(ssh)) {
1.292 djm 506: /* clear mask since we did not call select() */
507: memset(*readsetp, 0, *nallocp);
508: memset(*writesetp, 0, *nallocp);
509: return;
1.16 markus 510: }
1.11 markus 511:
1.294 djm 512: FD_SET(connection_in, *readsetp);
513:
1.11 markus 514: /* Select server connection if have data to write to the server. */
1.320 djm 515: if (ssh_packet_have_data_to_write(ssh))
1.46 markus 516: FD_SET(connection_out, *writesetp);
1.11 markus 517:
1.13 markus 518: /*
519: * Wait for something to happen. This will suspend the process until
520: * some selected descriptor can be read, written, or has some other
1.222 djm 521: * event pending, or a timeout expires.
1.13 markus 522: */
1.11 markus 523:
1.222 djm 524: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.345 dtucker 525: if (options.server_alive_interval > 0)
526: timeout_secs = MAXIMUM(server_alive_time - now, 0);
1.292 djm 527: if (options.rekey_interval > 0 && !rekeying)
1.320 djm 528: timeout_secs = MINIMUM(timeout_secs,
529: ssh_packet_get_rekey_timeout(ssh));
1.303 djm 530: set_control_persist_exit_time(ssh);
1.222 djm 531: if (control_persist_exit_time > 0) {
1.287 deraadt 532: timeout_secs = MINIMUM(timeout_secs,
1.249 dtucker 533: control_persist_exit_time - now);
1.222 djm 534: if (timeout_secs < 0)
535: timeout_secs = 0;
536: }
1.239 djm 537: if (minwait_secs != 0)
1.287 deraadt 538: timeout_secs = MINIMUM(timeout_secs, (int)minwait_secs);
1.222 djm 539: if (timeout_secs == INT_MAX)
1.117 markus 540: tvp = NULL;
1.129 deraadt 541: else {
1.222 djm 542: tv.tv_sec = timeout_secs;
1.117 markus 543: tv.tv_usec = 0;
544: tvp = &tv;
545: }
1.222 djm 546:
1.117 markus 547: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
1.326 deraadt 548: if (ret == -1) {
1.51 markus 549: /*
550: * We have to clear the select masks, because we return.
551: * We have to return, because the mainloop checks for the flags
552: * set by the signal handlers.
553: */
1.87 markus 554: memset(*readsetp, 0, *nallocp);
555: memset(*writesetp, 0, *nallocp);
1.11 markus 556: if (errno == EINTR)
557: return;
558: /* Note: we might still have data in the buffers. */
1.315 markus 559: if ((r = sshbuf_putf(stderr_buffer,
560: "select: %s\r\n", strerror(errno))) != 0)
1.354 djm 561: fatal_fr(r, "sshbuf_putf");
1.11 markus 562: quit_pending = 1;
1.345 dtucker 563: } else if (options.server_alive_interval > 0 && !FD_ISSET(connection_in,
1.365 dtucker 564: *readsetp) && monotime() >= server_alive_time)
1.249 dtucker 565: /*
1.345 dtucker 566: * ServerAlive check is needed. We can't rely on the select
567: * timing out since traffic on the client side such as port
568: * forwards can keep waking it up.
1.249 dtucker 569: */
1.345 dtucker 570: server_alive_check(ssh);
1.11 markus 571: }
572:
1.77 itojun 573: static void
1.315 markus 574: client_suspend_self(struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr)
1.1 deraadt 575: {
1.11 markus 576: /* Flush stdout and stderr buffers. */
1.315 markus 577: if (sshbuf_len(bout) > 0)
578: atomicio(vwrite, fileno(stdout), sshbuf_mutable_ptr(bout),
579: sshbuf_len(bout));
580: if (sshbuf_len(berr) > 0)
581: atomicio(vwrite, fileno(stderr), sshbuf_mutable_ptr(berr),
582: sshbuf_len(berr));
1.11 markus 583:
1.233 djm 584: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 585:
1.305 djm 586: sshbuf_reset(bin);
587: sshbuf_reset(bout);
588: sshbuf_reset(berr);
1.11 markus 589:
590: /* Send the suspend signal to the program itself. */
591: kill(getpid(), SIGTSTP);
592:
1.132 djm 593: /* Reset window sizes in case they have changed */
594: received_window_change_signal = 1;
1.11 markus 595:
1.233 djm 596: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 597: }
598:
1.77 itojun 599: static void
1.320 djm 600: client_process_net_input(struct ssh *ssh, fd_set *readset)
1.11 markus 601: {
1.17 markus 602: char buf[8192];
1.315 markus 603: int r, len;
1.11 markus 604:
1.13 markus 605: /*
606: * Read input from the server, and add any such data to the buffer of
607: * the packet subsystem.
608: */
1.11 markus 609: if (FD_ISSET(connection_in, readset)) {
1.345 dtucker 610: schedule_server_alive_check();
1.11 markus 611: /* Read as much as possible. */
1.280 markus 612: len = read(connection_in, buf, sizeof(buf));
613: if (len == 0) {
1.197 djm 614: /*
615: * Received EOF. The remote host has closed the
616: * connection.
617: */
1.315 markus 618: if ((r = sshbuf_putf(stderr_buffer,
1.197 djm 619: "Connection to %.300s closed by remote host.\r\n",
1.315 markus 620: host)) != 0)
1.354 djm 621: fatal_fr(r, "sshbuf_putf");
1.1 deraadt 622: quit_pending = 1;
623: return;
1.11 markus 624: }
1.13 markus 625: /*
626: * There is a kernel bug on Solaris that causes select to
627: * sometimes wake up even though there is no data available.
628: */
1.326 deraadt 629: if (len == -1 && (errno == EAGAIN || errno == EINTR))
1.11 markus 630: len = 0;
631:
1.326 deraadt 632: if (len == -1) {
1.197 djm 633: /*
634: * An error has encountered. Perhaps there is a
635: * network problem.
636: */
1.315 markus 637: if ((r = sshbuf_putf(stderr_buffer,
1.197 djm 638: "Read from remote host %.300s: %.100s\r\n",
1.315 markus 639: host, strerror(errno))) != 0)
1.354 djm 640: fatal_fr(r, "sshbuf_putf");
1.11 markus 641: quit_pending = 1;
642: return;
643: }
1.320 djm 644: ssh_packet_process_incoming(ssh, buf, len);
1.11 markus 645: }
1.17 markus 646: }
1.16 markus 647:
1.97 jakob 648: static void
1.303 djm 649: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 650: {
1.190 djm 651: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
652: char errmsg[256];
1.315 markus 653: int r, tochan;
1.190 djm 654:
1.234 djm 655: /*
656: * If a TTY was explicitly requested, then a failure to allocate
657: * one is fatal.
658: */
659: if (cr->action == CONFIRM_TTY &&
660: (options.request_tty == REQUEST_TTY_FORCE ||
661: options.request_tty == REQUEST_TTY_YES))
662: cr->action = CONFIRM_CLOSE;
663:
1.312 djm 664: /* XXX suppress on mux _client_ quietmode */
1.190 djm 665: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 666: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 667:
668: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
669: debug2("%s request accepted on channel %d",
670: cr->request_type, c->self);
671: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
672: if (tochan) {
673: snprintf(errmsg, sizeof(errmsg),
674: "%s request failed\r\n", cr->request_type);
675: } else {
676: snprintf(errmsg, sizeof(errmsg),
677: "%s request failed on channel %d",
678: cr->request_type, c->self);
679: }
680: /* If error occurred on primary session channel, then exit */
1.234 djm 681: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 682: fatal("%s", errmsg);
1.234 djm 683: /*
684: * If error occurred on mux client, append to
685: * their stderr.
686: */
687: if (tochan) {
1.360 djm 688: debug3_f("channel %d: mux request: %s", c->self,
689: cr->request_type);
1.315 markus 690: if ((r = sshbuf_put(c->extended, errmsg,
691: strlen(errmsg))) != 0)
1.354 djm 692: fatal_fr(r, "sshbuf_put");
1.234 djm 693: } else
1.190 djm 694: error("%s", errmsg);
1.234 djm 695: if (cr->action == CONFIRM_TTY) {
696: /*
697: * If a TTY allocation error occurred, then arrange
698: * for the correct TTY to leave raw mode.
699: */
700: if (c->self == session_ident)
701: leave_raw_mode(0);
702: else
1.303 djm 703: mux_tty_alloc_failed(ssh, c);
1.234 djm 704: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 705: chan_read_failed(ssh, c);
706: chan_write_failed(ssh, c);
1.190 djm 707: }
708: }
1.250 djm 709: free(cr);
1.190 djm 710: }
711:
712: static void
1.303 djm 713: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 714: {
1.250 djm 715: free(ctx);
1.190 djm 716: }
1.129 deraadt 717:
1.236 djm 718: void
1.303 djm 719: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 720: enum confirm_action action)
1.190 djm 721: {
1.255 djm 722: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 723:
1.190 djm 724: cr->request_type = request;
1.234 djm 725: cr->action = action;
1.123 djm 726:
1.303 djm 727: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 728: client_abandon_status_confirm, cr);
1.196 djm 729: }
730:
731: void
732: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
733: {
1.201 djm 734: struct global_confirm *gc, *last_gc;
1.196 djm 735:
736: /* Coalesce identical callbacks */
1.201 djm 737: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
738: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
739: if (++last_gc->ref_count >= INT_MAX)
1.354 djm 740: fatal_f("last_gc->ref_count = %d",
741: last_gc->ref_count);
1.196 djm 742: return;
743: }
744:
1.255 djm 745: gc = xcalloc(1, sizeof(*gc));
1.196 djm 746: gc->cb = cb;
747: gc->ctx = ctx;
748: gc->ref_count = 1;
749: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 750: }
751:
752: static void
1.303 djm 753: process_cmdline(struct ssh *ssh)
1.97 jakob 754: {
755: void (*handler)(int);
1.261 millert 756: char *s, *cmd;
757: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
758: struct Forward fwd;
1.97 jakob 759:
1.257 tedu 760: memset(&fwd, 0, sizeof(fwd));
1.183 djm 761:
1.233 djm 762: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.332 dtucker 763: handler = ssh_signal(SIGINT, SIG_IGN);
1.99 markus 764: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 765: if (s == NULL)
766: goto out;
1.256 deraadt 767: while (isspace((u_char)*s))
1.97 jakob 768: s++;
1.121 djm 769: if (*s == '-')
770: s++; /* Skip cmdline '-', if any */
1.120 dtucker 771: if (*s == '\0')
1.97 jakob 772: goto out;
1.121 djm 773:
1.122 djm 774: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 775: logit("Commands:");
1.164 djm 776: logit(" -L[bind_address:]port:host:hostport "
777: "Request local forward");
778: logit(" -R[bind_address:]port:host:hostport "
779: "Request remote forward");
1.204 stevesk 780: logit(" -D[bind_address:]port "
781: "Request dynamic forward");
1.237 markus 782: logit(" -KL[bind_address:]port "
783: "Cancel local forward");
1.165 stevesk 784: logit(" -KR[bind_address:]port "
1.164 djm 785: "Cancel remote forward");
1.237 markus 786: logit(" -KD[bind_address:]port "
787: "Cancel dynamic forward");
1.146 reyk 788: if (!options.permit_local_command)
789: goto out;
1.164 djm 790: logit(" !args "
791: "Execute local command");
1.146 reyk 792: goto out;
793: }
794:
795: if (*s == '!' && options.permit_local_command) {
796: s++;
797: ssh_local_cmd(s);
1.121 djm 798: goto out;
799: }
800:
801: if (*s == 'K') {
802: delete = 1;
803: s++;
804: }
1.204 stevesk 805: if (*s == 'L')
806: local = 1;
807: else if (*s == 'R')
808: remote = 1;
809: else if (*s == 'D')
810: dynamic = 1;
811: else {
1.109 itojun 812: logit("Invalid command.");
1.97 jakob 813: goto out;
814: }
1.204 stevesk 815:
1.256 deraadt 816: while (isspace((u_char)*++s))
1.179 tedu 817: ;
1.97 jakob 818:
1.217 djm 819: /* XXX update list of forwards in options */
1.121 djm 820: if (delete) {
1.261 millert 821: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
822: if (!parse_forward(&fwd, s, 1, 0)) {
823: logit("Bad forwarding close specification.");
1.121 djm 824: goto out;
825: }
1.237 markus 826: if (remote)
1.303 djm 827: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 828: else if (dynamic)
1.303 djm 829: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 830: 0, &options.fwd_opts) > 0;
1.237 markus 831: else
1.303 djm 832: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 833: CHANNEL_CANCEL_PORT_STATIC,
834: &options.fwd_opts) > 0;
1.237 markus 835: if (!ok) {
1.290 dtucker 836: logit("Unknown port forwarding.");
1.237 markus 837: goto out;
838: }
839: logit("Canceled forwarding.");
1.121 djm 840: } else {
1.209 djm 841: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 842: logit("Bad forwarding specification.");
843: goto out;
844: }
1.204 stevesk 845: if (local || dynamic) {
1.303 djm 846: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 847: &options.fwd_opts)) {
1.121 djm 848: logit("Port forwarding failed.");
849: goto out;
850: }
1.135 djm 851: } else {
1.303 djm 852: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 853: logit("Port forwarding failed.");
854: goto out;
855: }
1.135 djm 856: }
1.121 djm 857: logit("Forwarding port.");
858: }
859:
1.97 jakob 860: out:
1.332 dtucker 861: ssh_signal(SIGINT, handler);
1.233 djm 862: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 863: free(cmd);
864: free(fwd.listen_host);
1.261 millert 865: free(fwd.listen_path);
1.250 djm 866: free(fwd.connect_host);
1.261 millert 867: free(fwd.connect_path);
1.97 jakob 868: }
869:
1.244 dtucker 870: /* reasons to suppress output of an escape command in help output */
871: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 872: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
873: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
874: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.244 dtucker 875: struct escape_help_text {
876: const char *cmd;
877: const char *text;
878: unsigned int flags;
879: };
880: static struct escape_help_text esc_txt[] = {
881: {".", "terminate session", SUPPRESS_MUXMASTER},
882: {".", "terminate connection (and any multiplexed sessions)",
883: SUPPRESS_MUXCLIENT},
1.292 djm 884: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.244 dtucker 885: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1.292 djm 886: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 887: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 888: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
889: {"#", "list forwarded connections", SUPPRESS_NEVER},
890: {"&", "background ssh (when waiting for connections to terminate)",
891: SUPPRESS_MUXCLIENT},
892: {"?", "this message", SUPPRESS_NEVER},
893: };
894:
895: static void
1.315 markus 896: print_escape_help(struct sshbuf *b, int escape_char, int mux_client,
897: int using_stderr)
1.244 dtucker 898: {
899: unsigned int i, suppress_flags;
1.315 markus 900: int r;
1.244 dtucker 901:
1.315 markus 902: if ((r = sshbuf_putf(b,
903: "%c?\r\nSupported escape sequences:\r\n", escape_char)) != 0)
1.354 djm 904: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 905:
1.292 djm 906: suppress_flags =
1.244 dtucker 907: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
908: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
909: (using_stderr ? 0 : SUPPRESS_SYSLOG);
910:
911: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
912: if (esc_txt[i].flags & suppress_flags)
913: continue;
1.315 markus 914: if ((r = sshbuf_putf(b, " %c%-3s - %s\r\n",
915: escape_char, esc_txt[i].cmd, esc_txt[i].text)) != 0)
1.354 djm 916: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 917: }
918:
1.315 markus 919: if ((r = sshbuf_putf(b,
1.246 dtucker 920: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 921: "(Note that escapes are only recognized immediately after "
1.315 markus 922: "newline.)\r\n", escape_char, escape_char)) != 0)
1.354 djm 923: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 924: }
925:
1.314 djm 926: /*
1.296 naddy 927: * Process the characters one by one.
1.195 djm 928: */
1.77 itojun 929: static int
1.303 djm 930: process_escapes(struct ssh *ssh, Channel *c,
1.315 markus 931: struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr,
1.195 djm 932: char *buf, int len)
1.31 markus 933: {
934: pid_t pid;
1.315 markus 935: int r, bytes = 0;
1.42 markus 936: u_int i;
937: u_char ch;
1.31 markus 938: char *s;
1.294 djm 939: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
940: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 941:
1.294 djm 942: if (c->filter_ctx == NULL)
943: return 0;
1.314 djm 944:
1.139 djm 945: if (len <= 0)
946: return (0);
947:
948: for (i = 0; i < (u_int)len; i++) {
1.31 markus 949: /* Get one character at a time. */
950: ch = buf[i];
951:
1.294 djm 952: if (efc->escape_pending) {
1.31 markus 953: /* We have previously seen an escape character. */
954: /* Clear the flag now. */
1.294 djm 955: efc->escape_pending = 0;
1.31 markus 956:
957: /* Process the escaped character. */
958: switch (ch) {
959: case '.':
960: /* Terminate the connection. */
1.315 markus 961: if ((r = sshbuf_putf(berr, "%c.\r\n",
962: efc->escape_char)) != 0)
1.354 djm 963: fatal_fr(r, "sshbuf_putf");
1.217 djm 964: if (c && c->ctl_chan != -1) {
1.303 djm 965: chan_read_failed(ssh, c);
966: chan_write_failed(ssh, c);
967: if (c->detach_user) {
968: c->detach_user(ssh,
969: c->self, NULL);
970: }
1.253 dtucker 971: c->type = SSH_CHANNEL_ABANDONED;
1.315 markus 972: sshbuf_reset(c->input);
1.303 djm 973: chan_ibuf_empty(ssh, c);
1.195 djm 974: return 0;
975: } else
976: quit_pending = 1;
1.31 markus 977: return -1;
978:
979: case 'Z' - 64:
1.195 djm 980: /* XXX support this for mux clients */
1.217 djm 981: if (c && c->ctl_chan != -1) {
1.245 dtucker 982: char b[16];
1.195 djm 983: noescape:
1.245 dtucker 984: if (ch == 'Z' - 64)
985: snprintf(b, sizeof b, "^Z");
986: else
987: snprintf(b, sizeof b, "%c", ch);
1.315 markus 988: if ((r = sshbuf_putf(berr,
1.245 dtucker 989: "%c%s escape not available to "
1.195 djm 990: "multiplexed sessions\r\n",
1.315 markus 991: efc->escape_char, b)) != 0)
1.354 djm 992: fatal_fr(r, "sshbuf_putf");
1.195 djm 993: continue;
994: }
1.197 djm 995: /* Suspend the program. Inform the user */
1.315 markus 996: if ((r = sshbuf_putf(berr,
997: "%c^Z [suspend ssh]\r\n",
998: efc->escape_char)) != 0)
1.354 djm 999: fatal_fr(r, "sshbuf_putf");
1.31 markus 1000:
1001: /* Restore terminal modes and suspend. */
1002: client_suspend_self(bin, bout, berr);
1003:
1004: /* We have been continued. */
1005: continue;
1006:
1.111 markus 1007: case 'B':
1.315 markus 1008: if ((r = sshbuf_putf(berr,
1009: "%cB\r\n", efc->escape_char)) != 0)
1.354 djm 1010: fatal_fr(r, "sshbuf_putf");
1.303 djm 1011: channel_request_start(ssh, c->self, "break", 0);
1.315 markus 1012: if ((r = sshpkt_put_u32(ssh, 1000)) != 0 ||
1013: (r = sshpkt_send(ssh)) != 0)
1.354 djm 1014: fatal_fr(r, "send packet");
1.111 markus 1015: continue;
1016:
1.54 markus 1017: case 'R':
1.357 djm 1018: if (ssh->compat & SSH_BUG_NOREKEY)
1.292 djm 1019: logit("Server does not "
1020: "support re-keying");
1021: else
1022: need_rekeying = 1;
1.54 markus 1023: continue;
1024:
1.242 dtucker 1025: case 'V':
1026: /* FALLTHROUGH */
1027: case 'v':
1028: if (c && c->ctl_chan != -1)
1029: goto noescape;
1030: if (!log_is_on_stderr()) {
1.315 markus 1031: if ((r = sshbuf_putf(berr,
1.242 dtucker 1032: "%c%c [Logging to syslog]\r\n",
1.315 markus 1033: efc->escape_char, ch)) != 0)
1.354 djm 1034: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1035: continue;
1036: }
1037: if (ch == 'V' && options.log_level >
1038: SYSLOG_LEVEL_QUIET)
1039: log_change_level(--options.log_level);
1040: if (ch == 'v' && options.log_level <
1041: SYSLOG_LEVEL_DEBUG3)
1042: log_change_level(++options.log_level);
1.315 markus 1043: if ((r = sshbuf_putf(berr,
1.294 djm 1044: "%c%c [LogLevel %s]\r\n",
1045: efc->escape_char, ch,
1.315 markus 1046: log_level_name(options.log_level))) != 0)
1.354 djm 1047: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1048: continue;
1049:
1.31 markus 1050: case '&':
1.217 djm 1051: if (c && c->ctl_chan != -1)
1.195 djm 1052: goto noescape;
1.31 markus 1053: /*
1.197 djm 1054: * Detach the program (continue to serve
1055: * connections, but put in background and no
1056: * more new connections).
1.31 markus 1057: */
1058: /* Restore tty modes. */
1.233 djm 1059: leave_raw_mode(
1060: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1061:
1062: /* Stop listening for new connections. */
1.303 djm 1063: channel_stop_listening(ssh);
1.31 markus 1064:
1.354 djm 1065: if ((r = sshbuf_putf(berr, "%c& "
1066: "[backgrounded]\n", efc->escape_char)) != 0)
1067: fatal_fr(r, "sshbuf_putf");
1.31 markus 1068:
1069: /* Fork into background. */
1070: pid = fork();
1.326 deraadt 1071: if (pid == -1) {
1.31 markus 1072: error("fork: %.100s", strerror(errno));
1073: continue;
1074: }
1075: if (pid != 0) { /* This is the parent. */
1076: /* The parent just exits. */
1077: exit(0);
1078: }
1079: /* The child continues serving connections. */
1.292 djm 1080: /* fake EOF on stdin */
1.315 markus 1081: if ((r = sshbuf_put_u8(bin, 4)) != 0)
1.354 djm 1082: fatal_fr(r, "sshbuf_put_u8");
1.292 djm 1083: return -1;
1.31 markus 1084: case '?':
1.294 djm 1085: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1086: (c && c->ctl_chan != -1),
1087: log_is_on_stderr());
1.31 markus 1088: continue;
1089:
1090: case '#':
1.315 markus 1091: if ((r = sshbuf_putf(berr, "%c#\r\n",
1092: efc->escape_char)) != 0)
1.354 djm 1093: fatal_fr(r, "sshbuf_putf");
1.303 djm 1094: s = channel_open_message(ssh);
1.315 markus 1095: if ((r = sshbuf_put(berr, s, strlen(s))) != 0)
1.354 djm 1096: fatal_fr(r, "sshbuf_put");
1.250 djm 1097: free(s);
1.97 jakob 1098: continue;
1099:
1100: case 'C':
1.217 djm 1101: if (c && c->ctl_chan != -1)
1.206 djm 1102: goto noescape;
1.303 djm 1103: process_cmdline(ssh);
1.31 markus 1104: continue;
1105:
1106: default:
1.294 djm 1107: if (ch != efc->escape_char) {
1.315 markus 1108: if ((r = sshbuf_put_u8(bin,
1109: efc->escape_char)) != 0)
1.354 djm 1110: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1111: bytes++;
1112: }
1113: /* Escaped characters fall through here */
1114: break;
1115: }
1116: } else {
1117: /*
1.197 djm 1118: * The previous character was not an escape char.
1119: * Check if this is an escape.
1.31 markus 1120: */
1.294 djm 1121: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1122: /*
1123: * It is. Set the flag and continue to
1124: * next character.
1125: */
1.294 djm 1126: efc->escape_pending = 1;
1.31 markus 1127: continue;
1128: }
1129: }
1130:
1131: /*
1132: * Normal character. Record whether it was a newline,
1133: * and append it to the buffer.
1134: */
1135: last_was_cr = (ch == '\r' || ch == '\n');
1.315 markus 1136: if ((r = sshbuf_put_u8(bin, ch)) != 0)
1.354 djm 1137: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1138: bytes++;
1139: }
1140: return bytes;
1141: }
1142:
1.13 markus 1143: /*
1.15 markus 1144: * Get packets from the connection input buffer, and process them as long as
1145: * there are packets available.
1146: *
1147: * Any unknown packets received during the actual
1148: * session cause the session to terminate. This is
1149: * intended to make debugging easier since no
1150: * confirmations are sent. Any compatible protocol
1151: * extensions must be negotiated during the
1152: * preparatory phase.
1153: */
1154:
1.77 itojun 1155: static void
1.321 djm 1156: client_process_buffered_input_packets(struct ssh *ssh)
1.15 markus 1157: {
1.321 djm 1158: ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1159: }
1160:
1.31 markus 1161: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1162:
1.195 djm 1163: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1164: void *
1165: client_new_escape_filter_ctx(int escape_char)
1166: {
1167: struct escape_filter_ctx *ret;
1168:
1.255 djm 1169: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1170: ret->escape_pending = 0;
1171: ret->escape_char = escape_char;
1172: return (void *)ret;
1173: }
1174:
1.198 djm 1175: /* Free the escape filter context on channel free */
1176: void
1.303 djm 1177: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1178: {
1.250 djm 1179: free(ctx);
1.198 djm 1180: }
1181:
1.195 djm 1182: int
1.303 djm 1183: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1184: {
1.190 djm 1185: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1186: return 0;
1187:
1.303 djm 1188: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1189: buf, len);
1.30 markus 1190: }
1191:
1.77 itojun 1192: static void
1.303 djm 1193: client_channel_closed(struct ssh *ssh, int id, void *arg)
1.60 markus 1194: {
1.303 djm 1195: channel_cancel_cleanup(ssh, id);
1.60 markus 1196: session_closed = 1;
1.233 djm 1197: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1198: }
1199:
1.15 markus 1200: /*
1.13 markus 1201: * Implements the interactive session with the server. This is called after
1202: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1203: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1204: * used as an escape character for terminating or suspending the session.
1.13 markus 1205: */
1.20 markus 1206: int
1.303 djm 1207: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1208: int ssh2_chan_id)
1.1 deraadt 1209: {
1.46 markus 1210: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1211: double start_time, total_time;
1.284 djm 1212: int r, max_fd = 0, max_fd2 = 0, len;
1.200 markus 1213: u_int64_t ibytes, obytes;
1.130 avsm 1214: u_int nalloc = 0;
1.11 markus 1215:
1216: debug("Entering interactive session.");
1.277 semarie 1217:
1.278 semarie 1218: if (options.control_master &&
1.286 djm 1219: !option_clear_or_none(options.control_path)) {
1.278 semarie 1220: debug("pledge: id");
1.327 mestre 1221: if (pledge("stdio rpath wpath cpath unix inet dns recvfd sendfd proc exec id tty",
1.278 semarie 1222: NULL) == -1)
1.354 djm 1223: fatal_f("pledge(): %s", strerror(errno));
1.278 semarie 1224:
1225: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1226: debug("pledge: exec");
1227: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1228: NULL) == -1)
1.354 djm 1229: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1230:
1231: } else if (options.update_hostkeys) {
1232: debug("pledge: filesystem full");
1233: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1234: NULL) == -1)
1.354 djm 1235: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1236:
1.286 djm 1237: } else if (!option_clear_or_none(options.proxy_command) ||
1238: fork_after_authentication_flag) {
1.277 semarie 1239: debug("pledge: proc");
1240: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1.354 djm 1241: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1242:
1243: } else {
1244: debug("pledge: network");
1.300 mestre 1245: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.354 djm 1246: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1247: }
1.11 markus 1248:
1.307 dtucker 1249: start_time = monotime_double();
1.11 markus 1250:
1251: /* Initialize variables. */
1252: last_was_cr = 1;
1253: exit_status = -1;
1.320 djm 1254: connection_in = ssh_packet_get_connection_in(ssh);
1255: connection_out = ssh_packet_get_connection_out(ssh);
1.287 deraadt 1256: max_fd = MAXIMUM(connection_in, connection_out);
1.46 markus 1257:
1.11 markus 1258: quit_pending = 0;
1259:
1.315 markus 1260: /* Initialize buffer. */
1261: if ((stderr_buffer = sshbuf_new()) == NULL)
1.354 djm 1262: fatal_f("sshbuf_new failed");
1.11 markus 1263:
1.321 djm 1264: client_init_dispatch(ssh);
1.15 markus 1265:
1.105 markus 1266: /*
1267: * Set signal handlers, (e.g. to restore non-blocking mode)
1268: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1269: */
1.332 dtucker 1270: if (ssh_signal(SIGHUP, SIG_IGN) != SIG_IGN)
1271: ssh_signal(SIGHUP, signal_handler);
1272: if (ssh_signal(SIGINT, SIG_IGN) != SIG_IGN)
1273: ssh_signal(SIGINT, signal_handler);
1274: if (ssh_signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1275: ssh_signal(SIGQUIT, signal_handler);
1276: if (ssh_signal(SIGTERM, SIG_IGN) != SIG_IGN)
1277: ssh_signal(SIGTERM, signal_handler);
1278: ssh_signal(SIGWINCH, window_change_handler);
1.11 markus 1279:
1280: if (have_pty)
1.233 djm 1281: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1282:
1.292 djm 1283: session_ident = ssh2_chan_id;
1284: if (session_ident != -1) {
1285: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1286: channel_register_filter(ssh, session_ident,
1.292 djm 1287: client_simple_escape_filter, NULL,
1288: client_filter_cleanup,
1289: client_new_escape_filter_ctx(
1290: escape_char_arg));
1.232 djm 1291: }
1.303 djm 1292: channel_register_cleanup(ssh, session_ident,
1.292 djm 1293: client_channel_closed, 0);
1.48 markus 1294: }
1.345 dtucker 1295:
1296: schedule_server_alive_check();
1.30 markus 1297:
1.11 markus 1298: /* Main loop of the client for the interactive session mode. */
1299: while (!quit_pending) {
1300:
1.13 markus 1301: /* Process buffered packets sent by the server. */
1.321 djm 1302: client_process_buffered_input_packets(ssh);
1.11 markus 1303:
1.303 djm 1304: if (session_closed && !channel_still_open(ssh))
1.60 markus 1305: break;
1306:
1.303 djm 1307: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1308: debug("rekeying in progress");
1.284 djm 1309: } else if (need_rekeying) {
1310: /* manual rekey request */
1311: debug("need rekeying");
1.303 djm 1312: if ((r = kex_start_rekex(ssh)) != 0)
1.354 djm 1313: fatal_fr(r, "kex_start_rekex");
1.284 djm 1314: need_rekeying = 0;
1.56 markus 1315: } else {
1316: /*
1317: * Make packets from buffered channel data, and
1318: * enqueue them for sending to the server.
1319: */
1.320 djm 1320: if (ssh_packet_not_very_much_data_to_write(ssh))
1.303 djm 1321: channel_output_poll(ssh);
1.11 markus 1322:
1.56 markus 1323: /*
1324: * Check if the window size has changed, and buffer a
1325: * message about it to the server if so.
1326: */
1.303 djm 1327: client_check_window_change(ssh);
1.11 markus 1328:
1.56 markus 1329: if (quit_pending)
1330: break;
1331: }
1.13 markus 1332: /*
1333: * Wait until we have something to do (something becomes
1334: * available on one of the descriptors).
1335: */
1.81 markus 1336: max_fd2 = max_fd;
1.303 djm 1337: client_wait_until_can_do_something(ssh, &readset, &writeset,
1338: &max_fd2, &nalloc, ssh_packet_is_rekeying(ssh));
1.11 markus 1339:
1340: if (quit_pending)
1341: break;
1342:
1.56 markus 1343: /* Do channel operations unless rekeying in progress. */
1.303 djm 1344: if (!ssh_packet_is_rekeying(ssh))
1345: channel_after_select(ssh, readset, writeset);
1.11 markus 1346:
1.17 markus 1347: /* Buffer input from the connection. */
1.320 djm 1348: client_process_net_input(ssh, readset);
1.17 markus 1349:
1350: if (quit_pending)
1351: break;
1.11 markus 1352:
1.197 djm 1353: /*
1354: * Send as much buffered packet data as possible to the
1355: * sender.
1356: */
1.338 djm 1357: if (FD_ISSET(connection_out, writeset)) {
1358: if ((r = ssh_packet_write_poll(ssh)) != 0) {
1359: sshpkt_fatal(ssh, r,
1360: "%s: ssh_packet_write_poll", __func__);
1361: }
1362: }
1.222 djm 1363:
1364: /*
1365: * If we are a backgrounded control master, and the
1366: * timeout has expired without any active client
1367: * connections, then quit.
1368: */
1369: if (control_persist_exit_time > 0) {
1.251 dtucker 1370: if (monotime() >= control_persist_exit_time) {
1.222 djm 1371: debug("ControlPersist timeout expired");
1372: break;
1373: }
1374: }
1.11 markus 1375: }
1.250 djm 1376: free(readset);
1377: free(writeset);
1.11 markus 1378:
1379: /* Terminate the session. */
1380:
1381: /* Stop watching for window change. */
1.332 dtucker 1382: ssh_signal(SIGWINCH, SIG_DFL);
1.211 andreas 1383:
1.320 djm 1384: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
1385: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_BY_APPLICATION)) != 0 ||
1386: (r = sshpkt_put_cstring(ssh, "disconnected by user")) != 0 ||
1387: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language tag */
1388: (r = sshpkt_send(ssh)) != 0 ||
1389: (r = ssh_packet_write_wait(ssh)) != 0)
1.354 djm 1390: fatal_fr(r, "send disconnect");
1.11 markus 1391:
1.303 djm 1392: channel_free_all(ssh);
1.11 markus 1393:
1.75 markus 1394: if (have_pty)
1.233 djm 1395: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.116 dtucker 1396:
1397: /*
1398: * If there was no shell or command requested, there will be no remote
1399: * exit status to be returned. In that case, clear error code if the
1400: * connection was deliberately terminated at this end.
1401: */
1.366 ! djm 1402: if (options.session_type == SESSION_TYPE_NONE && received_signal == SIGTERM) {
1.116 dtucker 1403: received_signal = 0;
1404: exit_status = 0;
1405: }
1.75 markus 1406:
1.301 dtucker 1407: if (received_signal) {
1408: verbose("Killed by signal %d.", (int) received_signal);
1.359 djm 1409: cleanup_exit(255);
1.301 dtucker 1410: }
1.75 markus 1411:
1.13 markus 1412: /*
1413: * In interactive mode (with pseudo tty) display a message indicating
1414: * that the connection has been closed.
1415: */
1.11 markus 1416: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.315 markus 1417: if ((r = sshbuf_putf(stderr_buffer,
1418: "Connection to %.64s closed.\r\n", host)) != 0)
1.354 djm 1419: fatal_fr(r, "sshbuf_putf");
1.11 markus 1420: }
1.70 markus 1421:
1.11 markus 1422: /* Output any buffered data for stderr. */
1.315 markus 1423: if (sshbuf_len(stderr_buffer) > 0) {
1.230 djm 1424: len = atomicio(vwrite, fileno(stderr),
1.315 markus 1425: (u_char *)sshbuf_ptr(stderr_buffer),
1426: sshbuf_len(stderr_buffer));
1427: if (len < 0 || (u_int)len != sshbuf_len(stderr_buffer))
1.11 markus 1428: error("Write failed flushing stderr buffer.");
1.315 markus 1429: else if ((r = sshbuf_consume(stderr_buffer, len)) != 0)
1.354 djm 1430: fatal_fr(r, "sshbuf_consume");
1.11 markus 1431: }
1432:
1433: /* Clear and free any buffers. */
1.315 markus 1434: sshbuf_free(stderr_buffer);
1.11 markus 1435:
1436: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1437: total_time = monotime_double() - start_time;
1.320 djm 1438: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.200 markus 1439: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1440: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1441: if (total_time > 0)
1.200 markus 1442: verbose("Bytes per second: sent %.1f, received %.1f",
1443: obytes / total_time, ibytes / total_time);
1.11 markus 1444: /* Return the exit status of the program. */
1445: debug("Exit status %d", exit_status);
1446: return exit_status;
1.15 markus 1447: }
1448:
1449: /*********/
1450:
1.77 itojun 1451: static Channel *
1.303 djm 1452: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1453: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1454: {
1.103 deraadt 1455: Channel *c = NULL;
1.289 markus 1456: struct sshbuf *b = NULL;
1.40 markus 1457: char *listen_address, *originator_address;
1.320 djm 1458: u_int listen_port, originator_port;
1.289 markus 1459: int r;
1.40 markus 1460:
1461: /* Get rest of the packet */
1.320 djm 1462: if ((r = sshpkt_get_cstring(ssh, &listen_address, NULL)) != 0 ||
1463: (r = sshpkt_get_u32(ssh, &listen_port)) != 0 ||
1464: (r = sshpkt_get_cstring(ssh, &originator_address, NULL)) != 0 ||
1465: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1466: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1467: fatal_fr(r, "parse packet");
1.40 markus 1468:
1.354 djm 1469: debug_f("listen %s port %d, originator %s port %d",
1.261 millert 1470: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1471:
1.320 djm 1472: if (listen_port > 0xffff)
1.354 djm 1473: error_f("invalid listen port");
1.320 djm 1474: else if (originator_port > 0xffff)
1.354 djm 1475: error_f("invalid originator port");
1.320 djm 1476: else {
1477: c = channel_connect_by_listen_address(ssh,
1478: listen_address, listen_port, "forwarded-tcpip",
1479: originator_address);
1480: }
1.40 markus 1481:
1.289 markus 1482: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1483: if ((b = sshbuf_new()) == NULL) {
1.354 djm 1484: error_f("alloc reply");
1.289 markus 1485: goto out;
1486: }
1487: /* reconstruct and send to muxclient */
1488: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1489: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1490: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1491: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1492: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1493: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1494: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1495: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1496: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1497: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1498: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.354 djm 1499: error_fr(r, "compose for muxclient");
1.289 markus 1500: goto out;
1501: }
1502: }
1503:
1504: out:
1505: sshbuf_free(b);
1.250 djm 1506: free(originator_address);
1507: free(listen_address);
1.40 markus 1508: return c;
1509: }
1510:
1.103 deraadt 1511: static Channel *
1.303 djm 1512: client_request_forwarded_streamlocal(struct ssh *ssh,
1513: const char *request_type, int rchan)
1.261 millert 1514: {
1515: Channel *c = NULL;
1516: char *listen_path;
1.320 djm 1517: int r;
1.261 millert 1518:
1519: /* Get the remote path. */
1.320 djm 1520: if ((r = sshpkt_get_cstring(ssh, &listen_path, NULL)) != 0 ||
1521: (r = sshpkt_get_string(ssh, NULL, NULL)) != 0 || /* reserved */
1522: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1523: fatal_fr(r, "parse packet");
1.261 millert 1524:
1.354 djm 1525: debug_f("request: %s", listen_path);
1.261 millert 1526:
1.303 djm 1527: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1528: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1529: free(listen_path);
1530: return c;
1531: }
1532:
1533: static Channel *
1.303 djm 1534: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1535: {
1536: Channel *c = NULL;
1537: char *originator;
1.321 djm 1538: u_int originator_port;
1.320 djm 1539: int r, sock;
1.40 markus 1540:
1541: if (!options.forward_x11) {
1542: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1543: error("Warning: this is probably a break-in attempt by a "
1544: "malicious server.");
1.221 djm 1545: return NULL;
1546: }
1.274 djm 1547: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1548: verbose("Rejected X11 connection after ForwardX11Timeout "
1549: "expired");
1.40 markus 1550: return NULL;
1551: }
1.320 djm 1552: if ((r = sshpkt_get_cstring(ssh, &originator, NULL)) != 0 ||
1.321 djm 1553: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1.320 djm 1554: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1555: fatal_fr(r, "parse packet");
1.40 markus 1556: /* XXX check permission */
1.321 djm 1557: /* XXX range check originator port? */
1558: debug("client_request_x11: request from %s %u", originator,
1.47 markus 1559: originator_port);
1.250 djm 1560: free(originator);
1.303 djm 1561: sock = x11_connect_display(ssh);
1.67 markus 1562: if (sock < 0)
1563: return NULL;
1.303 djm 1564: c = channel_new(ssh, "x11",
1.67 markus 1565: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1566: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1567: c->force_drain = 1;
1.40 markus 1568: return c;
1569: }
1570:
1.103 deraadt 1571: static Channel *
1.303 djm 1572: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1573: {
1574: Channel *c = NULL;
1.262 djm 1575: int r, sock;
1.40 markus 1576:
1577: if (!options.forward_agent) {
1578: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1579: error("Warning: this is probably a break-in attempt by a "
1580: "malicious server.");
1.40 markus 1581: return NULL;
1582: }
1.330 djm 1583: if (forward_agent_sock_path == NULL) {
1584: r = ssh_get_authentication_socket(&sock);
1585: } else {
1586: r = ssh_get_authentication_socket_path(forward_agent_sock_path, &sock);
1587: }
1588: if (r != 0) {
1.262 djm 1589: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.354 djm 1590: debug_fr(r, "ssh_get_authentication_socket");
1.67 markus 1591: return NULL;
1.262 djm 1592: }
1.303 djm 1593: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1594: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1595: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1596: "authentication agent connection", 1);
1.82 markus 1597: c->force_drain = 1;
1.40 markus 1598: return c;
1.180 djm 1599: }
1600:
1.306 djm 1601: char *
1.303 djm 1602: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1.343 djm 1603: int local_tun, int remote_tun, channel_open_fn *cb, void *cbctx)
1.180 djm 1604: {
1605: Channel *c;
1.320 djm 1606: int r, fd;
1.306 djm 1607: char *ifname = NULL;
1.180 djm 1608:
1609: if (tun_mode == SSH_TUNMODE_NO)
1610: return 0;
1611:
1612: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1613:
1614: /* Open local tunnel device */
1.306 djm 1615: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1616: error("Tunnel device open failed.");
1.306 djm 1617: return NULL;
1.180 djm 1618: }
1.306 djm 1619: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1620:
1.303 djm 1621: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1622: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1623: c->datagram = 1;
1.343 djm 1624:
1625: if (cb != NULL)
1626: channel_register_open_confirm(ssh, c->self, cb, cbctx);
1.180 djm 1627:
1.320 djm 1628: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1629: (r = sshpkt_put_cstring(ssh, "tun@openssh.com")) != 0 ||
1630: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1631: (r = sshpkt_put_u32(ssh, c->local_window_max)) != 0 ||
1632: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1633: (r = sshpkt_put_u32(ssh, tun_mode)) != 0 ||
1634: (r = sshpkt_put_u32(ssh, remote_tun)) != 0 ||
1635: (r = sshpkt_send(ssh)) != 0)
1.321 djm 1636: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.180 djm 1637:
1.306 djm 1638: return ifname;
1.40 markus 1639: }
1640:
1.22 markus 1641: /* XXXX move to generic input handler */
1.264 markus 1642: static int
1.297 markus 1643: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1644: {
1645: Channel *c = NULL;
1.320 djm 1646: char *ctype = NULL;
1647: int r;
1648: u_int rchan;
1649: size_t len;
1650: u_int rmaxpack, rwindow;
1651:
1652: if ((r = sshpkt_get_cstring(ssh, &ctype, &len)) != 0 ||
1653: (r = sshpkt_get_u32(ssh, &rchan)) != 0 ||
1654: (r = sshpkt_get_u32(ssh, &rwindow)) != 0 ||
1655: (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0)
1656: goto out;
1.22 markus 1657:
1.24 markus 1658: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1659: ctype, rchan, rwindow, rmaxpack);
1660:
1.40 markus 1661: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1662: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1663: rmaxpack);
1.261 millert 1664: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1665: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1666: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1667: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1668: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1669: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1670: }
1.289 markus 1671: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1672: debug3("proxied to downstream: %s", ctype);
1673: } else if (c != NULL) {
1.22 markus 1674: debug("confirm %s", ctype);
1675: c->remote_id = rchan;
1.304 djm 1676: c->have_remote_id = 1;
1.22 markus 1677: c->remote_window = rwindow;
1678: c->remote_maxpacket = rmaxpack;
1.69 markus 1679: if (c->type != SSH_CHANNEL_CONNECTING) {
1.320 djm 1680: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1681: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1682: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1683: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1684: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1685: (r = sshpkt_send(ssh)) != 0)
1686: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.69 markus 1687: }
1.22 markus 1688: } else {
1689: debug("failure %s", ctype);
1.320 djm 1690: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
1691: (r = sshpkt_put_u32(ssh, rchan)) != 0 ||
1692: (r = sshpkt_put_u32(ssh, SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED)) != 0 ||
1693: (r = sshpkt_put_cstring(ssh, "open failed")) != 0 ||
1694: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1695: (r = sshpkt_send(ssh)) != 0)
1696: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.22 markus 1697: }
1.320 djm 1698: r = 0;
1699: out:
1.250 djm 1700: free(ctype);
1.320 djm 1701: return r;
1.22 markus 1702: }
1.267 djm 1703:
1.264 markus 1704: static int
1.297 markus 1705: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1706: {
1707: Channel *c = NULL;
1.320 djm 1708: char *rtype = NULL;
1709: u_char reply;
1710: u_int id, exitval;
1711: int r, success = 0;
1712:
1713: if ((r = sshpkt_get_u32(ssh, &id)) != 0)
1714: return r;
1715: if (id <= INT_MAX)
1716: c = channel_lookup(ssh, id);
1.297 markus 1717: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1718: return 0;
1.320 djm 1719: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
1720: (r = sshpkt_get_u8(ssh, &reply)) != 0)
1721: goto out;
1.48 markus 1722:
1.320 djm 1723: debug("client_input_channel_req: channel %u rtype %s reply %d",
1.48 markus 1724: id, rtype, reply);
1725:
1.320 djm 1726: if (c == NULL) {
1.197 djm 1727: error("client_input_channel_req: channel %d: "
1728: "unknown channel", id);
1.193 markus 1729: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1.320 djm 1730: if ((r = sshpkt_get_end(ssh)) != 0)
1731: goto out;
1.303 djm 1732: chan_rcvd_eow(ssh, c);
1.48 markus 1733: } else if (strcmp(rtype, "exit-status") == 0) {
1.320 djm 1734: if ((r = sshpkt_get_u32(ssh, &exitval)) != 0)
1735: goto out;
1.217 djm 1736: if (c->ctl_chan != -1) {
1.303 djm 1737: mux_exit_message(ssh, c, exitval);
1.215 djm 1738: success = 1;
1.320 djm 1739: } else if ((int)id == session_ident) {
1.215 djm 1740: /* Record exit value of local session */
1.123 djm 1741: success = 1;
1742: exit_status = exitval;
1.215 djm 1743: } else {
1.218 djm 1744: /* Probably for a mux channel that has already closed */
1.354 djm 1745: debug_f("no sink for exit-status on channel %d",
1746: id);
1.123 djm 1747: }
1.320 djm 1748: if ((r = sshpkt_get_end(ssh)) != 0)
1749: goto out;
1.48 markus 1750: }
1.259 djm 1751: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1752: if (!c->have_remote_id)
1.354 djm 1753: fatal_f("channel %d: no remote_id", c->self);
1.320 djm 1754: if ((r = sshpkt_start(ssh, success ?
1755: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE)) != 0 ||
1756: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1757: (r = sshpkt_send(ssh)) != 0)
1758: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.48 markus 1759: }
1.320 djm 1760: r = 0;
1761: out:
1.250 djm 1762: free(rtype);
1.320 djm 1763: return r;
1.48 markus 1764: }
1.267 djm 1765:
1.269 djm 1766: struct hostkeys_update_ctx {
1767: /* The hostname and (optionally) IP address string for the server */
1768: char *host_str, *ip_str;
1769:
1770: /*
1771: * Keys received from the server and a flag for each indicating
1772: * whether they already exist in known_hosts.
1.351 djm 1773: * keys_match is filled in by hostkeys_find() and later (for new
1.269 djm 1774: * keys) by client_global_hostkeys_private_confirm().
1775: */
1776: struct sshkey **keys;
1.351 djm 1777: u_int *keys_match; /* mask of HKF_MATCH_* from hostfile.h */
1778: int *keys_verified; /* flag for new keys verified by server */
1779: size_t nkeys, nnew, nincomplete; /* total, new keys, incomplete match */
1.269 djm 1780:
1781: /*
1782: * Keys that are in known_hosts, but were not present in the update
1783: * from the server (i.e. scheduled to be deleted).
1784: * Filled in by hostkeys_find().
1785: */
1786: struct sshkey **old_keys;
1787: size_t nold;
1.347 djm 1788:
1789: /* Various special cases. */
1.350 djm 1790: int complex_hostspec; /* wildcard or manual pattern-list host name */
1.347 djm 1791: int ca_available; /* saw CA key for this host */
1.352 djm 1792: int old_key_seen; /* saw old key with other name/addr */
1.353 djm 1793: int other_name_seen; /* saw key with other name/addr */
1.269 djm 1794: };
1795:
1796: static void
1797: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1798: {
1799: size_t i;
1800:
1801: if (ctx == NULL)
1802: return;
1803: for (i = 0; i < ctx->nkeys; i++)
1804: sshkey_free(ctx->keys[i]);
1805: free(ctx->keys);
1.351 djm 1806: free(ctx->keys_match);
1807: free(ctx->keys_verified);
1.269 djm 1808: for (i = 0; i < ctx->nold; i++)
1809: sshkey_free(ctx->old_keys[i]);
1810: free(ctx->old_keys);
1811: free(ctx->host_str);
1812: free(ctx->ip_str);
1813: free(ctx);
1814: }
1815:
1.350 djm 1816: /*
1817: * Returns non-zero if a known_hosts hostname list is not of a form that
1818: * can be handled by UpdateHostkeys. These include wildcard hostnames and
1819: * hostnames lists that do not follow the form host[,ip].
1820: */
1821: static int
1822: hostspec_is_complex(const char *hosts)
1823: {
1824: char *cp;
1825:
1826: /* wildcard */
1827: if (strchr(hosts, '*') != NULL || strchr(hosts, '?') != NULL)
1828: return 1;
1829: /* single host/ip = ok */
1830: if ((cp = strchr(hosts, ',')) == NULL)
1831: return 0;
1832: /* more than two entries on the line */
1833: if (strchr(cp + 1, ',') != NULL)
1834: return 1;
1835: /* XXX maybe parse cp+1 and ensure it is an IP? */
1836: return 0;
1837: }
1838:
1.352 djm 1839: /* callback to search for ctx->keys in known_hosts */
1.269 djm 1840: static int
1841: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1842: {
1843: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1844: size_t i;
1845: struct sshkey **tmp;
1846:
1.353 djm 1847: if (l->key == NULL)
1.269 djm 1848: return 0;
1.353 djm 1849: if (l->status != HKF_STATUS_MATCHED) {
1850: /* Record if one of the keys appears on a non-matching line */
1851: for (i = 0; i < ctx->nkeys; i++) {
1852: if (sshkey_equal(l->key, ctx->keys[i])) {
1853: ctx->other_name_seen = 1;
1.354 djm 1854: debug3_f("found %s key under different "
1855: "name/addr at %s:%ld",
1.353 djm 1856: sshkey_ssh_name(ctx->keys[i]),
1857: l->path, l->linenum);
1858: return 0;
1859: }
1860: }
1861: return 0;
1862: }
1863: /* Don't proceed if revocation or CA markers are present */
1864: /* XXX relax this */
1865: if (l->marker != MRK_NONE) {
1.354 djm 1866: debug3_f("hostkeys file %s:%ld has CA/revocation marker",
1867: l->path, l->linenum);
1.353 djm 1868: ctx->complex_hostspec = 1;
1869: return 0;
1870: }
1871:
1.355 djm 1872: /* If CheckHostIP is enabled, then check for mismatched hostname/addr */
1873: if (ctx->ip_str != NULL && strchr(l->hosts, ',') != NULL) {
1874: if ((l->match & HKF_MATCH_HOST) == 0) {
1875: /* Record if address matched a different hostname. */
1876: ctx->other_name_seen = 1;
1877: debug3_f("found address %s against different hostname "
1878: "at %s:%ld", ctx->ip_str, l->path, l->linenum);
1879: return 0;
1880: } else if ((l->match & HKF_MATCH_IP) == 0) {
1881: /* Record if hostname matched a different address. */
1882: ctx->other_name_seen = 1;
1883: debug3_f("found hostname %s against different address "
1884: "at %s:%ld", ctx->host_str, l->path, l->linenum);
1885: }
1.353 djm 1886: }
1.269 djm 1887:
1.350 djm 1888: /*
1889: * UpdateHostkeys is skipped for wildcard host names and hostnames
1890: * that contain more than two entries (ssh never writes these).
1891: */
1892: if (hostspec_is_complex(l->hosts)) {
1.354 djm 1893: debug3_f("hostkeys file %s:%ld complex host specification",
1894: l->path, l->linenum);
1.350 djm 1895: ctx->complex_hostspec = 1;
1.347 djm 1896: return 0;
1897: }
1898:
1.269 djm 1899: /* Mark off keys we've already seen for this host */
1900: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 1901: if (!sshkey_equal(l->key, ctx->keys[i]))
1902: continue;
1.354 djm 1903: debug3_f("found %s key at %s:%ld",
1.351 djm 1904: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1905: ctx->keys_match[i] |= l->match;
1906: return 0;
1.269 djm 1907: }
1908: /* This line contained a key that not offered by the server */
1.354 djm 1909: debug3_f("deprecated %s key at %s:%ld", sshkey_ssh_name(l->key),
1910: l->path, l->linenum);
1.299 deraadt 1911: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1912: sizeof(*ctx->old_keys))) == NULL)
1.354 djm 1913: fatal_f("recallocarray failed nold = %zu", ctx->nold);
1.269 djm 1914: ctx->old_keys = tmp;
1915: ctx->old_keys[ctx->nold++] = l->key;
1916: l->key = NULL;
1917:
1918: return 0;
1919: }
1920:
1.352 djm 1921: /* callback to search for ctx->old_keys in known_hosts under other names */
1922: static int
1923: hostkeys_check_old(struct hostkey_foreach_line *l, void *_ctx)
1924: {
1925: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1926: size_t i;
1927: int hashed;
1928:
1929: /* only care about lines that *don't* match the active host spec */
1930: if (l->status == HKF_STATUS_MATCHED || l->key == NULL)
1931: return 0;
1932:
1933: hashed = l->match & (HKF_MATCH_HOST_HASHED|HKF_MATCH_IP_HASHED);
1934: for (i = 0; i < ctx->nold; i++) {
1935: if (!sshkey_equal(l->key, ctx->old_keys[i]))
1936: continue;
1.354 djm 1937: debug3_f("found deprecated %s key at %s:%ld as %s",
1.364 djm 1938: sshkey_ssh_name(ctx->old_keys[i]), l->path, l->linenum,
1.352 djm 1939: hashed ? "[HASHED]" : l->hosts);
1940: ctx->old_key_seen = 1;
1941: break;
1942: }
1943: return 0;
1944: }
1945:
1946: /*
1947: * Check known_hosts files for deprecated keys under other names. Returns 0
1948: * on success or -1 on failure. Updates ctx->old_key_seen if deprecated keys
1949: * exist under names other than the active hostname/IP.
1950: */
1951: static int
1952: check_old_keys_othernames(struct hostkeys_update_ctx *ctx)
1953: {
1954: size_t i;
1955: int r;
1956:
1.354 djm 1957: debug2_f("checking for %zu deprecated keys", ctx->nold);
1.352 djm 1958: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 1959: debug3_f("searching %s for %s / %s",
1.352 djm 1960: options.user_hostfiles[i], ctx->host_str,
1961: ctx->ip_str ? ctx->ip_str : "(none)");
1962: if ((r = hostkeys_foreach(options.user_hostfiles[i],
1963: hostkeys_check_old, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 1964: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.352 djm 1965: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 1966: debug_f("hostkeys file %s does not exist",
1967: options.user_hostfiles[i]);
1.352 djm 1968: continue;
1969: }
1.354 djm 1970: error_fr(r, "hostkeys_foreach failed for %s",
1971: options.user_hostfiles[i]);
1.352 djm 1972: return -1;
1973: }
1974: }
1975: return 0;
1976: }
1977:
1.269 djm 1978: static void
1.337 djm 1979: hostkey_change_preamble(LogLevel loglevel)
1.269 djm 1980: {
1.336 djm 1981: do_log2(loglevel, "The server has updated its host keys.");
1982: do_log2(loglevel, "These changes were verified by the server's "
1983: "existing trusted key.");
1984: }
1985:
1986: static void
1987: update_known_hosts(struct hostkeys_update_ctx *ctx)
1988: {
1989: int r, was_raw = 0, first = 1;
1990: int asking = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK;
1991: LogLevel loglevel = asking ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1.269 djm 1992: char *fp, *response;
1993: size_t i;
1.333 djm 1994: struct stat sb;
1.269 djm 1995:
1996: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 1997: if (!ctx->keys_verified[i])
1.269 djm 1998: continue;
1999: if ((fp = sshkey_fingerprint(ctx->keys[i],
2000: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2001: fatal_f("sshkey_fingerprint failed");
1.336 djm 2002: if (first && asking)
1.337 djm 2003: hostkey_change_preamble(loglevel);
1.269 djm 2004: do_log2(loglevel, "Learned new hostkey: %s %s",
2005: sshkey_type(ctx->keys[i]), fp);
1.336 djm 2006: first = 0;
1.269 djm 2007: free(fp);
2008: }
2009: for (i = 0; i < ctx->nold; i++) {
2010: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2011: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2012: fatal_f("sshkey_fingerprint failed");
1.336 djm 2013: if (first && asking)
1.337 djm 2014: hostkey_change_preamble(loglevel);
1.269 djm 2015: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2016: sshkey_type(ctx->old_keys[i]), fp);
1.336 djm 2017: first = 0;
1.269 djm 2018: free(fp);
2019: }
2020: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2021: if (get_saved_tio() != NULL) {
2022: leave_raw_mode(1);
2023: was_raw = 1;
2024: }
1.269 djm 2025: response = NULL;
2026: for (i = 0; !quit_pending && i < 3; i++) {
2027: free(response);
2028: response = read_passphrase("Accept updated hostkeys? "
2029: "(yes/no): ", RP_ECHO);
2030: if (strcasecmp(response, "yes") == 0)
2031: break;
2032: else if (quit_pending || response == NULL ||
2033: strcasecmp(response, "no") == 0) {
2034: options.update_hostkeys = 0;
2035: break;
2036: } else {
2037: do_log2(loglevel, "Please enter "
2038: "\"yes\" or \"no\"");
2039: }
2040: }
2041: if (quit_pending || i >= 3 || response == NULL)
2042: options.update_hostkeys = 0;
2043: free(response);
1.271 djm 2044: if (was_raw)
2045: enter_raw_mode(1);
1.269 djm 2046: }
1.333 djm 2047: if (options.update_hostkeys == 0)
2048: return;
1.269 djm 2049: /*
2050: * Now that all the keys are verified, we can go ahead and replace
2051: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2052: * cancel the operation).
2053: */
1.333 djm 2054: for (i = 0; i < options.num_user_hostfiles; i++) {
2055: /*
2056: * NB. keys are only added to hostfiles[0], for the rest we
2057: * just delete the hostname entries.
2058: */
2059: if (stat(options.user_hostfiles[i], &sb) != 0) {
2060: if (errno == ENOENT) {
1.354 djm 2061: debug_f("known hosts file %s does not "
2062: "exist", options.user_hostfiles[i]);
1.333 djm 2063: } else {
1.354 djm 2064: error_f("known hosts file %s "
2065: "inaccessible: %s",
2066: options.user_hostfiles[i], strerror(errno));
1.333 djm 2067: }
2068: continue;
2069: }
2070: if ((r = hostfile_replace_entries(options.user_hostfiles[i],
2071: ctx->host_str, ctx->ip_str,
2072: i == 0 ? ctx->keys : NULL, i == 0 ? ctx->nkeys : 0,
2073: options.hash_known_hosts, 0,
2074: options.fingerprint_hash)) != 0) {
1.354 djm 2075: error_fr(r, "hostfile_replace_entries failed for %s",
2076: options.user_hostfiles[i]);
1.333 djm 2077: }
2078: }
1.269 djm 2079: }
2080:
2081: static void
1.303 djm 2082: client_global_hostkeys_private_confirm(struct ssh *ssh, int type,
2083: u_int32_t seq, void *_ctx)
1.269 djm 2084: {
2085: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2086: size_t i, ndone;
2087: struct sshbuf *signdata;
1.309 djm 2088: int r, kexsigtype, use_kexsigtype;
1.269 djm 2089: const u_char *sig;
2090: size_t siglen;
2091:
2092: if (ctx->nnew == 0)
1.354 djm 2093: fatal_f("ctx->nnew == 0"); /* sanity */
1.269 djm 2094: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2095: error("Server failed to confirm ownership of "
2096: "private host keys");
2097: hostkeys_update_ctx_free(ctx);
2098: return;
2099: }
1.309 djm 2100: kexsigtype = sshkey_type_plain(
2101: sshkey_type_from_name(ssh->kex->hostkey_alg));
2102:
1.269 djm 2103: if ((signdata = sshbuf_new()) == NULL)
1.354 djm 2104: fatal_f("sshbuf_new failed");
1.269 djm 2105: /*
2106: * Expect a signature for each of the ctx->nnew private keys we
2107: * haven't seen before. They will be in the same order as the
1.351 djm 2108: * ctx->keys where the corresponding ctx->keys_match[i] == 0.
1.269 djm 2109: */
2110: for (ndone = i = 0; i < ctx->nkeys; i++) {
1.351 djm 2111: if (ctx->keys_match[i])
1.269 djm 2112: continue;
2113: /* Prepare data to be signed: session ID, unique string, key */
2114: sshbuf_reset(signdata);
1.270 djm 2115: if ( (r = sshbuf_put_cstring(signdata,
2116: "hostkeys-prove-00@openssh.com")) != 0 ||
1.358 djm 2117: (r = sshbuf_put_stringb(signdata,
2118: ssh->kex->session_id)) != 0 ||
1.269 djm 2119: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1.354 djm 2120: fatal_fr(r, "compose signdata");
1.269 djm 2121: /* Extract and verify signature */
2122: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1.354 djm 2123: error_fr(r, "parse sig");
1.269 djm 2124: goto out;
2125: }
1.309 djm 2126: /*
2127: * For RSA keys, prefer to use the signature type negotiated
2128: * during KEX to the default (SHA1).
2129: */
2130: use_kexsigtype = kexsigtype == KEY_RSA &&
2131: sshkey_type_plain(ctx->keys[i]->type) == KEY_RSA;
1.361 djm 2132: debug3_f("verify %s key %zu using %s sigalg",
2133: sshkey_type(ctx->keys[i]), i,
1.362 dtucker 2134: use_kexsigtype ? ssh->kex->hostkey_alg : "default");
1.269 djm 2135: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 2136: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.329 djm 2137: use_kexsigtype ? ssh->kex->hostkey_alg : NULL, 0,
2138: NULL)) != 0) {
1.361 djm 2139: error_fr(r, "server gave bad signature for %s key %zu",
1.354 djm 2140: sshkey_type(ctx->keys[i]), i);
1.269 djm 2141: goto out;
2142: }
2143: /* Key is good. Mark it as 'seen' */
1.351 djm 2144: ctx->keys_verified[i] = 1;
1.269 djm 2145: ndone++;
2146: }
1.354 djm 2147: /* Shouldn't happen */
1.269 djm 2148: if (ndone != ctx->nnew)
1.354 djm 2149: fatal_f("ndone != ctx->nnew (%zu / %zu)", ndone, ctx->nnew);
1.320 djm 2150: if ((r = sshpkt_get_end(ssh)) != 0) {
1.354 djm 2151: error_f("protocol error");
1.320 djm 2152: goto out;
2153: }
1.269 djm 2154:
2155: /* Make the edits to known_hosts */
2156: update_known_hosts(ctx);
2157: out:
2158: hostkeys_update_ctx_free(ctx);
2159: }
2160:
1.267 djm 2161: /*
1.291 djm 2162: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
2163: * Made slightly less trivial by the multiple RSA signature algorithm names.
2164: */
2165: static int
2166: key_accepted_by_hostkeyalgs(const struct sshkey *key)
2167: {
2168: const char *ktype = sshkey_ssh_name(key);
1.331 dtucker 2169: const char *hostkeyalgs = options.hostkeyalgorithms;
1.291 djm 2170:
2171: if (key == NULL || key->type == KEY_UNSPEC)
2172: return 0;
2173: if (key->type == KEY_RSA &&
2174: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
2175: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
2176: return 1;
2177: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
2178: }
2179:
2180: /*
1.270 djm 2181: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2182: * the server's hostkeys. The keys are checked against the user's
2183: * HostkeyAlgorithms preference before they are accepted.
2184: */
2185: static int
1.321 djm 2186: client_input_hostkeys(struct ssh *ssh)
1.267 djm 2187: {
2188: const u_char *blob = NULL;
1.269 djm 2189: size_t i, len = 0;
1.267 djm 2190: struct sshbuf *buf = NULL;
1.269 djm 2191: struct sshkey *key = NULL, **tmp;
2192: int r;
2193: char *fp;
1.267 djm 2194: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2195: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2196: struct hostkeys_update_ctx *ctx = NULL;
1.351 djm 2197: u_int want;
1.267 djm 2198:
2199: if (hostkeys_seen)
1.354 djm 2200: fatal_f("server already sent hostkeys");
1.269 djm 2201: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2202: options.batch_mode)
2203: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2204: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2205: return 1;
1.272 djm 2206:
2207: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2208: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2209: sshkey_free(key);
2210: key = NULL;
1.269 djm 2211: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
1.354 djm 2212: error_fr(r, "parse key");
1.269 djm 2213: goto out;
2214: }
1.270 djm 2215: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
1.354 djm 2216: do_log2_fr(r, r == SSH_ERR_KEY_TYPE_UNKNOWN ?
1.335 djm 2217: SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR,
1.354 djm 2218: "convert key");
1.335 djm 2219: continue;
1.270 djm 2220: }
1.267 djm 2221: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2222: SSH_FP_DEFAULT);
1.354 djm 2223: debug3_f("received %s key %s", sshkey_type(key), fp);
1.267 djm 2224: free(fp);
1.275 markus 2225:
1.291 djm 2226: if (!key_accepted_by_hostkeyalgs(key)) {
1.354 djm 2227: debug3_f("%s key not permitted by "
2228: "HostkeyAlgorithms", sshkey_ssh_name(key));
1.267 djm 2229: continue;
2230: }
1.269 djm 2231: /* Skip certs */
2232: if (sshkey_is_cert(key)) {
1.354 djm 2233: debug3_f("%s key is a certificate; skipping",
2234: sshkey_ssh_name(key));
1.269 djm 2235: continue;
2236: }
2237: /* Ensure keys are unique */
2238: for (i = 0; i < ctx->nkeys; i++) {
2239: if (sshkey_equal(key, ctx->keys[i])) {
1.354 djm 2240: error_f("received duplicated %s host key",
2241: sshkey_ssh_name(key));
1.269 djm 2242: goto out;
2243: }
2244: }
2245: /* Key is good, record it */
1.299 deraadt 2246: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2247: sizeof(*ctx->keys))) == NULL)
1.354 djm 2248: fatal_f("recallocarray failed nkeys = %zu",
2249: ctx->nkeys);
1.269 djm 2250: ctx->keys = tmp;
2251: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2252: key = NULL;
2253: }
2254:
1.269 djm 2255: if (ctx->nkeys == 0) {
1.354 djm 2256: debug_f("server sent no hostkeys");
1.267 djm 2257: goto out;
2258: }
1.270 djm 2259:
1.351 djm 2260: if ((ctx->keys_match = calloc(ctx->nkeys,
2261: sizeof(*ctx->keys_match))) == NULL ||
2262: (ctx->keys_verified = calloc(ctx->nkeys,
2263: sizeof(*ctx->keys_verified))) == NULL)
1.354 djm 2264: fatal_f("calloc failed");
1.267 djm 2265:
1.268 djm 2266: get_hostfile_hostname_ipaddr(host,
2267: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2268: options.port, &ctx->host_str,
2269: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2270:
1.269 djm 2271: /* Find which keys we already know about. */
1.333 djm 2272: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2273: debug_f("searching %s for %s / %s",
1.339 dtucker 2274: options.user_hostfiles[i], ctx->host_str,
1.340 dtucker 2275: ctx->ip_str ? ctx->ip_str : "(none)");
1.333 djm 2276: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2277: hostkeys_find, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2278: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.333 djm 2279: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2280: debug_f("hostkeys file %s does not exist",
2281: options.user_hostfiles[i]);
1.333 djm 2282: continue;
2283: }
1.354 djm 2284: error_fr(r, "hostkeys_foreach failed for %s",
2285: options.user_hostfiles[i]);
1.333 djm 2286: goto out;
2287: }
1.267 djm 2288: }
2289:
1.269 djm 2290: /* Figure out if we have any new keys to add */
1.351 djm 2291: ctx->nnew = ctx->nincomplete = 0;
2292: want = HKF_MATCH_HOST | ( options.check_host_ip ? HKF_MATCH_IP : 0);
1.269 djm 2293: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2294: if (ctx->keys_match[i] == 0)
1.269 djm 2295: ctx->nnew++;
1.351 djm 2296: if ((ctx->keys_match[i] & want) != want)
2297: ctx->nincomplete++;
1.269 djm 2298: }
2299:
1.354 djm 2300: debug3_f("%zu server keys: %zu new, %zu retained, "
2301: "%zu incomplete match. %zu to remove", ctx->nkeys, ctx->nnew,
2302: ctx->nkeys - ctx->nnew - ctx->nincomplete,
1.351 djm 2303: ctx->nincomplete, ctx->nold);
1.269 djm 2304:
1.353 djm 2305: if (ctx->nnew == 0 && ctx->nold == 0) {
1.354 djm 2306: debug_f("no new or deprecated keys from server");
1.353 djm 2307: goto out;
2308: }
2309:
2310: /* Various reasons why we cannot proceed with the update */
2311: if (ctx->complex_hostspec) {
1.354 djm 2312: debug_f("CA/revocation marker, manual host list or wildcard "
2313: "host pattern found, skipping UserKnownHostsFile update");
1.353 djm 2314: goto out;
2315: }
2316: if (ctx->other_name_seen) {
1.354 djm 2317: debug_f("host key found matching a different name/address, "
2318: "skipping UserKnownHostsFile update");
1.347 djm 2319: goto out;
1.352 djm 2320: }
2321: /*
2322: * If removing keys, check whether they appear under different
2323: * names/addresses and refuse to proceed if they do. This avoids
2324: * cases such as hosts with multiple names becoming inconsistent
2325: * with regards to CheckHostIP entries.
2326: * XXX UpdateHostkeys=force to override this (and other) checks?
2327: */
2328: if (ctx->nold != 0) {
2329: if (check_old_keys_othernames(ctx) != 0)
2330: goto out; /* error already logged */
2331: if (ctx->old_key_seen) {
1.354 djm 2332: debug_f("key(s) for %s%s%s exist under other names; "
2333: "skipping UserKnownHostsFile update",
1.352 djm 2334: ctx->host_str, ctx->ip_str == NULL ? "" : ",",
2335: ctx->ip_str == NULL ? "" : ctx->ip_str);
2336: goto out;
2337: }
2338: }
2339:
1.353 djm 2340: if (ctx->nnew == 0) {
1.351 djm 2341: /*
2342: * We have some keys to remove or fix matching for.
2343: * We can proceed to do this without requiring a fresh proof
2344: * from the server.
2345: */
1.269 djm 2346: update_known_hosts(ctx);
1.353 djm 2347: goto out;
2348: }
2349: /*
2350: * We have received previously-unseen keys from the server.
2351: * Ask the server to confirm ownership of the private halves.
2352: */
1.354 djm 2353: debug3_f("asking server to prove ownership for %zu keys", ctx->nnew);
1.353 djm 2354: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2355: (r = sshpkt_put_cstring(ssh,
2356: "hostkeys-prove-00@openssh.com")) != 0 ||
2357: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
1.354 djm 2358: fatal_fr(r, "prepare hostkeys-prove");
1.353 djm 2359: if ((buf = sshbuf_new()) == NULL)
1.354 djm 2360: fatal_f("sshbuf_new");
1.353 djm 2361: for (i = 0; i < ctx->nkeys; i++) {
2362: if (ctx->keys_match[i])
2363: continue;
2364: sshbuf_reset(buf);
2365: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0 ||
1.354 djm 2366: (r = sshpkt_put_stringb(ssh, buf)) != 0)
2367: fatal_fr(r, "assemble hostkeys-prove");
1.269 djm 2368: }
1.353 djm 2369: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2370: fatal_fr(r, "send hostkeys-prove");
1.353 djm 2371: client_register_global_confirm(
2372: client_global_hostkeys_private_confirm, ctx);
2373: ctx = NULL; /* will be freed in callback */
1.269 djm 2374:
1.267 djm 2375: /* Success */
2376: out:
1.269 djm 2377: hostkeys_update_ctx_free(ctx);
1.267 djm 2378: sshkey_free(key);
2379: sshbuf_free(buf);
1.269 djm 2380: /*
2381: * NB. Return success for all cases. The server doesn't need to know
2382: * what the client does with its hosts file.
2383: */
2384: return 1;
1.267 djm 2385: }
2386:
1.264 markus 2387: static int
1.297 markus 2388: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2389: {
2390: char *rtype;
1.320 djm 2391: u_char want_reply;
2392: int r, success = 0;
1.95 markus 2393:
1.320 djm 2394: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
2395: (r = sshpkt_get_u8(ssh, &want_reply)) != 0)
2396: goto out;
1.117 markus 2397: debug("client_input_global_request: rtype %s want_reply %d",
2398: rtype, want_reply);
1.270 djm 2399: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.321 djm 2400: success = client_input_hostkeys(ssh);
1.95 markus 2401: if (want_reply) {
1.320 djm 2402: if ((r = sshpkt_start(ssh, success ? SSH2_MSG_REQUEST_SUCCESS :
2403: SSH2_MSG_REQUEST_FAILURE)) != 0 ||
2404: (r = sshpkt_send(ssh)) != 0 ||
2405: (r = ssh_packet_write_wait(ssh)) != 0)
2406: goto out;
1.95 markus 2407: }
1.320 djm 2408: r = 0;
2409: out:
1.250 djm 2410: free(rtype);
1.320 djm 2411: return r;
1.95 markus 2412: }
1.22 markus 2413:
1.354 djm 2414: static void
2415: client_send_env(struct ssh *ssh, int id, const char *name, const char *val)
2416: {
2417: int r;
2418:
2419: debug("channel %d: setting env %s = \"%s\"", id, name, val);
2420: channel_request_start(ssh, id, "env", 0);
2421: if ((r = sshpkt_put_cstring(ssh, name)) != 0 ||
2422: (r = sshpkt_put_cstring(ssh, val)) != 0 ||
2423: (r = sshpkt_send(ssh)) != 0)
2424: fatal_fr(r, "send setenv");
2425: }
2426:
1.123 djm 2427: void
1.303 djm 2428: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.315 markus 2429: const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd,
2430: char **env)
1.123 djm 2431: {
1.320 djm 2432: int i, j, matched, len, r;
1.313 djm 2433: char *name, *val;
1.132 djm 2434: Channel *c = NULL;
1.123 djm 2435:
1.354 djm 2436: debug2_f("id %d", id);
1.123 djm 2437:
1.303 djm 2438: if ((c = channel_lookup(ssh, id)) == NULL)
1.354 djm 2439: fatal_f("channel %d: unknown channel", id);
1.224 djm 2440:
1.320 djm 2441: ssh_packet_set_interactive(ssh, want_tty,
1.224 djm 2442: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2443:
1.123 djm 2444: if (want_tty) {
2445: struct winsize ws;
2446:
2447: /* Store window size in the packet. */
1.326 deraadt 2448: if (ioctl(in_fd, TIOCGWINSZ, &ws) == -1)
1.123 djm 2449: memset(&ws, 0, sizeof(ws));
2450:
1.303 djm 2451: channel_request_start(ssh, id, "pty-req", 1);
2452: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.320 djm 2453: if ((r = sshpkt_put_cstring(ssh, term != NULL ? term : ""))
2454: != 0 ||
2455: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
2456: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
2457: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
2458: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0)
1.354 djm 2459: fatal_fr(r, "build pty-req");
1.194 djm 2460: if (tiop == NULL)
2461: tiop = get_saved_tio();
1.316 markus 2462: ssh_tty_make_modes(ssh, -1, tiop);
1.320 djm 2463: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2464: fatal_fr(r, "send pty-req");
1.123 djm 2465: /* XXX wait for reply */
1.132 djm 2466: c->client_tty = 1;
1.123 djm 2467: }
2468:
2469: /* Transfer any environment variables from client to server */
1.126 djm 2470: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2471: debug("Sending environment.");
1.126 djm 2472: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2473: /* Split */
1.126 djm 2474: name = xstrdup(env[i]);
1.123 djm 2475: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2476: free(name);
1.123 djm 2477: continue;
2478: }
2479: *val++ = '\0';
2480:
2481: matched = 0;
2482: for (j = 0; j < options.num_send_env; j++) {
2483: if (match_pattern(name, options.send_env[j])) {
2484: matched = 1;
2485: break;
2486: }
2487: }
2488: if (!matched) {
2489: debug3("Ignored env %s", name);
1.250 djm 2490: free(name);
1.123 djm 2491: continue;
2492: }
1.354 djm 2493: client_send_env(ssh, id, name, val);
1.250 djm 2494: free(name);
1.123 djm 2495: }
1.313 djm 2496: }
2497: for (i = 0; i < options.num_setenv; i++) {
2498: /* Split */
2499: name = xstrdup(options.setenv[i]);
2500: if ((val = strchr(name, '=')) == NULL) {
2501: free(name);
2502: continue;
2503: }
2504: *val++ = '\0';
1.354 djm 2505: client_send_env(ssh, id, name, val);
1.313 djm 2506: free(name);
1.123 djm 2507: }
2508:
1.315 markus 2509: len = sshbuf_len(cmd);
1.123 djm 2510: if (len > 0) {
2511: if (len > 900)
2512: len = 900;
2513: if (want_subsystem) {
1.190 djm 2514: debug("Sending subsystem: %.*s",
1.315 markus 2515: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2516: channel_request_start(ssh, id, "subsystem", 1);
2517: client_expect_confirm(ssh, id, "subsystem",
2518: CONFIRM_CLOSE);
1.123 djm 2519: } else {
1.190 djm 2520: debug("Sending command: %.*s",
1.315 markus 2521: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2522: channel_request_start(ssh, id, "exec", 1);
2523: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2524: }
1.320 djm 2525: if ((r = sshpkt_put_stringb(ssh, cmd)) != 0 ||
2526: (r = sshpkt_send(ssh)) != 0)
1.354 djm 2527: fatal_fr(r, "send command");
1.123 djm 2528: } else {
1.303 djm 2529: channel_request_start(ssh, id, "shell", 1);
2530: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.354 djm 2531: if ((r = sshpkt_send(ssh)) != 0)
2532: fatal_fr(r, "send shell");
1.123 djm 2533: }
2534: }
2535:
1.77 itojun 2536: static void
1.321 djm 2537: client_init_dispatch(struct ssh *ssh)
1.16 markus 2538: {
1.321 djm 2539: ssh_dispatch_init(ssh, &dispatch_protocol_error);
1.100 markus 2540:
1.321 djm 2541: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2542: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2543: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2544: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2545: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2546: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2547: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2548: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2549: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2550: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2551: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2552: ssh_dispatch_set(ssh, SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2553:
2554: /* rekeying */
1.321 djm 2555: ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2556:
2557: /* global request reply messages */
1.321 djm 2558: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2559: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2560: }
2561:
2562: void
2563: client_stop_mux(void)
2564: {
2565: if (options.control_path != NULL && muxserver_sock != -1)
2566: unlink(options.control_path);
2567: /*
1.247 dtucker 2568: * If we are in persist mode, or don't have a shell, signal that we
2569: * should close when all active channels are closed.
1.232 djm 2570: */
1.366 ! djm 2571: if (options.control_persist || options.session_type == SESSION_TYPE_NONE) {
1.232 djm 2572: session_closed = 1;
1.235 djm 2573: setproctitle("[stopped mux]");
2574: }
1.113 markus 2575: }
2576:
2577: /* client specific fatal cleanup */
2578: void
1.114 markus 2579: cleanup_exit(int i)
1.113 markus 2580: {
1.233 djm 2581: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.192 djm 2582: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2583: unlink(options.control_path);
1.223 djm 2584: ssh_kill_proxy_command();
1.114 markus 2585: _exit(i);
1.1 deraadt 2586: }
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