Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.380
1.380 ! djm 1: /* $OpenBSD: clientloop.c,v 1.379 2022/04/20 04:19:11 djm Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.189 djm 68: #include <sys/queue.h>
1.150 stevesk 69:
1.155 stevesk 70: #include <ctype.h>
1.168 stevesk 71: #include <errno.h>
1.151 stevesk 72: #include <paths.h>
1.374 djm 73: #include <poll.h>
1.153 stevesk 74: #include <signal.h>
1.174 stevesk 75: #include <stdio.h>
1.173 stevesk 76: #include <stdlib.h>
1.170 stevesk 77: #include <string.h>
1.328 deraadt 78: #include <stdarg.h>
1.150 stevesk 79: #include <termios.h>
1.175 deraadt 80: #include <pwd.h>
1.169 stevesk 81: #include <unistd.h>
1.266 deraadt 82: #include <limits.h>
1.1 deraadt 83:
1.175 deraadt 84: #include "xmalloc.h"
1.45 markus 85: #include "ssh.h"
86: #include "ssh2.h"
1.1 deraadt 87: #include "packet.h"
1.315 markus 88: #include "sshbuf.h"
1.15 markus 89: #include "compat.h"
1.74 markus 90: #include "channels.h"
1.15 markus 91: #include "dispatch.h"
1.317 markus 92: #include "sshkey.h"
1.175 deraadt 93: #include "cipher.h"
1.54 markus 94: #include "kex.h"
1.275 markus 95: #include "myproposal.h"
1.45 markus 96: #include "log.h"
1.261 millert 97: #include "misc.h"
1.45 markus 98: #include "readconf.h"
99: #include "clientloop.h"
1.147 djm 100: #include "sshconnect.h"
1.40 markus 101: #include "authfd.h"
1.45 markus 102: #include "atomicio.h"
1.118 deraadt 103: #include "sshpty.h"
1.123 djm 104: #include "match.h"
105: #include "msg.h"
1.262 djm 106: #include "ssherr.h"
1.267 djm 107: #include "hostfile.h"
1.319 djm 108:
1.375 djm 109: /* Permitted RSA signature algorithms for UpdateHostkeys proofs */
110: #define HOSTKEY_PROOF_RSA_ALGS "rsa-sha2-512,rsa-sha2-256"
111:
1.39 markus 112: /* import options */
113: extern Options options;
1.1 deraadt 114:
1.123 djm 115: /* Control socket */
1.217 djm 116: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 117:
1.13 markus 118: /*
119: * Name of the host we are connecting to. This is the name given on the
1.324 jmc 120: * command line, or the Hostname specified for the user-supplied name in a
1.13 markus 121: * configuration file.
122: */
1.1 deraadt 123: extern char *host;
124:
1.13 markus 125: /*
1.330 djm 126: * If this field is not NULL, the ForwardAgent socket is this path and different
127: * instead of SSH_AUTH_SOCK.
128: */
129: extern char *forward_agent_sock_path;
130:
131: /*
1.13 markus 132: * Flag to indicate that we have received a window change signal which has
133: * not yet been processed. This will cause a message indicating the new
134: * window size to be sent to the server a little later. This is volatile
135: * because this is updated in a signal handler.
136: */
1.88 markus 137: static volatile sig_atomic_t received_window_change_signal = 0;
138: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 139:
1.222 djm 140: /* Time when backgrounded control master using ControlPersist should exit */
141: static time_t control_persist_exit_time = 0;
142:
1.1 deraadt 143: /* Common data for the client loop code. */
1.217 djm 144: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.11 markus 145: static int last_was_cr; /* Last character was a newline. */
1.197 djm 146: static int exit_status; /* Used to store the command exit status. */
1.315 markus 147: static struct sshbuf *stderr_buffer; /* Used for final exit message. */
1.11 markus 148: static int connection_in; /* Connection to server (input). */
149: static int connection_out; /* Connection to server (output). */
1.56 markus 150: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 151: static int session_closed; /* In SSH2: login session closed. */
1.274 djm 152: static u_int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.345 dtucker 153: static time_t server_alive_time; /* Time to do server_alive_check */
1.1 deraadt 154:
1.321 djm 155: static void client_init_dispatch(struct ssh *ssh);
1.16 markus 156: int session_ident = -1;
157:
1.195 djm 158: /* Track escape per proto2 channel */
159: struct escape_filter_ctx {
160: int escape_pending;
161: int escape_char;
162: };
163:
164: /* Context for channel confirmation replies */
1.190 djm 165: struct channel_reply_ctx {
166: const char *request_type;
1.234 djm 167: int id;
168: enum confirm_action action;
1.190 djm 169: };
170:
1.196 djm 171: /* Global request success/failure callbacks */
1.303 djm 172: /* XXX move to struct ssh? */
1.196 djm 173: struct global_confirm {
174: TAILQ_ENTRY(global_confirm) entry;
175: global_confirm_cb *cb;
176: void *ctx;
177: int ref_count;
178: };
179: TAILQ_HEAD(global_confirms, global_confirm);
180: static struct global_confirms global_confirms =
181: TAILQ_HEAD_INITIALIZER(global_confirms);
182:
1.315 markus 183: void ssh_process_session2_setup(int, int, int, struct sshbuf *);
1.377 djm 184: static void quit_message(const char *fmt, ...)
185: __attribute__((__format__ (printf, 1, 2)));
186:
187: static void
188: quit_message(const char *fmt, ...)
189: {
190: char *msg;
191: va_list args;
192: int r;
193:
194: va_start(args, fmt);
195: xvasprintf(&msg, fmt, args);
196: va_end(args);
197:
198: if ((r = sshbuf_putf(stderr_buffer, "%s\r\n", msg)) != 0)
199: fatal_fr(r, "sshbuf_putf");
200: quit_pending = 1;
201: }
1.123 djm 202:
1.13 markus 203: /*
204: * Signal handler for the window change signal (SIGWINCH). This just sets a
205: * flag indicating that the window has changed.
206: */
1.157 deraadt 207: /*ARGSUSED */
1.77 itojun 208: static void
1.11 markus 209: window_change_handler(int sig)
1.1 deraadt 210: {
1.11 markus 211: received_window_change_signal = 1;
1.1 deraadt 212: }
213:
1.13 markus 214: /*
215: * Signal handler for signals that cause the program to terminate. These
216: * signals must be trapped to restore terminal modes.
217: */
1.157 deraadt 218: /*ARGSUSED */
1.77 itojun 219: static void
1.11 markus 220: signal_handler(int sig)
1.1 deraadt 221: {
1.75 markus 222: received_signal = sig;
223: quit_pending = 1;
1.1 deraadt 224: }
225:
1.13 markus 226: /*
1.222 djm 227: * Sets control_persist_exit_time to the absolute time when the
228: * backgrounded control master should exit due to expiry of the
229: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
230: * control master process, or if there is no ControlPersist timeout.
231: */
232: static void
1.303 djm 233: set_control_persist_exit_time(struct ssh *ssh)
1.222 djm 234: {
235: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 236: || options.control_persist_timeout == 0) {
1.222 djm 237: /* not using a ControlPersist timeout */
238: control_persist_exit_time = 0;
1.303 djm 239: } else if (channel_still_open(ssh)) {
1.222 djm 240: /* some client connections are still open */
241: if (control_persist_exit_time > 0)
1.354 djm 242: debug2_f("cancel scheduled exit");
1.222 djm 243: control_persist_exit_time = 0;
244: } else if (control_persist_exit_time <= 0) {
245: /* a client connection has recently closed */
1.251 dtucker 246: control_persist_exit_time = monotime() +
1.222 djm 247: (time_t)options.control_persist_timeout;
1.354 djm 248: debug2_f("schedule exit in %d seconds",
1.222 djm 249: options.control_persist_timeout);
250: }
251: /* else we are already counting down to the timeout */
252: }
253:
1.238 dtucker 254: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
255: static int
256: client_x11_display_valid(const char *display)
257: {
258: size_t i, dlen;
259:
1.279 djm 260: if (display == NULL)
261: return 0;
262:
1.238 dtucker 263: dlen = strlen(display);
264: for (i = 0; i < dlen; i++) {
1.256 deraadt 265: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 266: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
267: debug("Invalid character '%c' in DISPLAY", display[i]);
268: return 0;
269: }
270: }
271: return 1;
272: }
273:
1.274 djm 274: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
275: #define X11_TIMEOUT_SLACK 60
1.279 djm 276: int
1.303 djm 277: client_x11_get_proto(struct ssh *ssh, const char *display,
278: const char *xauth_path, u_int trusted, u_int timeout,
279: char **_proto, char **_data)
1.138 djm 280: {
1.318 djm 281: char *cmd, line[512], xdisplay[512];
1.279 djm 282: char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
1.138 djm 283: static char proto[512], data[512];
284: FILE *f;
1.288 tedu 285: int got_data = 0, generated = 0, do_unlink = 0, r;
1.138 djm 286: struct stat st;
1.274 djm 287: u_int now, x11_timeout_real;
1.138 djm 288:
289: *_proto = proto;
290: *_data = data;
1.279 djm 291: proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
1.138 djm 292:
1.279 djm 293: if (!client_x11_display_valid(display)) {
1.283 millert 294: if (display != NULL)
295: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
296: display);
1.279 djm 297: return -1;
298: }
299: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
1.138 djm 300: debug("No xauth program.");
1.279 djm 301: xauth_path = NULL;
302: }
303:
304: if (xauth_path != NULL) {
1.138 djm 305: /*
306: * Handle FamilyLocal case where $DISPLAY does
307: * not match an authorization entry. For this we
308: * just try "xauth list unix:displaynum.screennum".
309: * XXX: "localhost" match to determine FamilyLocal
310: * is not perfect.
311: */
312: if (strncmp(display, "localhost:", 10) == 0) {
1.279 djm 313: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
314: display + 10)) < 0 ||
315: (size_t)r >= sizeof(xdisplay)) {
1.354 djm 316: error_f("display name too long");
1.279 djm 317: return -1;
318: }
1.138 djm 319: display = xdisplay;
320: }
321: if (trusted == 0) {
1.274 djm 322: /*
1.279 djm 323: * Generate an untrusted X11 auth cookie.
324: *
1.274 djm 325: * The authentication cookie should briefly outlive
326: * ssh's willingness to forward X11 connections to
327: * avoid nasty fail-open behaviour in the X server.
328: */
1.279 djm 329: mktemp_proto(xauthdir, sizeof(xauthdir));
330: if (mkdtemp(xauthdir) == NULL) {
1.354 djm 331: error_f("mkdtemp: %s", strerror(errno));
1.279 djm 332: return -1;
333: }
334: do_unlink = 1;
335: if ((r = snprintf(xauthfile, sizeof(xauthfile),
336: "%s/xauthfile", xauthdir)) < 0 ||
337: (size_t)r >= sizeof(xauthfile)) {
1.354 djm 338: error_f("xauthfile path too long");
1.279 djm 339: rmdir(xauthdir);
340: return -1;
341: }
342:
1.318 djm 343: if (timeout == 0) {
344: /* auth doesn't time out */
345: xasprintf(&cmd, "%s -f %s generate %s %s "
346: "untrusted 2>%s",
347: xauth_path, xauthfile, display,
348: SSH_X11_PROTO, _PATH_DEVNULL);
349: } else {
350: /* Add some slack to requested expiry */
351: if (timeout < UINT_MAX - X11_TIMEOUT_SLACK)
352: x11_timeout_real = timeout +
353: X11_TIMEOUT_SLACK;
354: else {
355: /* Don't overflow on long timeouts */
356: x11_timeout_real = UINT_MAX;
357: }
358: xasprintf(&cmd, "%s -f %s generate %s %s "
359: "untrusted timeout %u 2>%s",
360: xauth_path, xauthfile, display,
361: SSH_X11_PROTO, x11_timeout_real,
362: _PATH_DEVNULL);
363: }
1.354 djm 364: debug2_f("xauth command: %s", cmd);
1.318 djm 365:
366: if (timeout != 0 && x11_refuse_time == 0) {
1.279 djm 367: now = monotime() + 1;
368: if (UINT_MAX - timeout < now)
369: x11_refuse_time = UINT_MAX;
370: else
371: x11_refuse_time = now + timeout;
1.303 djm 372: channel_set_x11_refuse_time(ssh,
373: x11_refuse_time);
1.138 djm 374: }
1.279 djm 375: if (system(cmd) == 0)
376: generated = 1;
1.318 djm 377: free(cmd);
1.138 djm 378: }
1.181 markus 379:
380: /*
381: * When in untrusted mode, we read the cookie only if it was
382: * successfully generated as an untrusted one in the step
383: * above.
384: */
385: if (trusted || generated) {
1.318 djm 386: xasprintf(&cmd,
1.181 markus 387: "%s %s%s list %s 2>" _PATH_DEVNULL,
388: xauth_path,
389: generated ? "-f " : "" ,
390: generated ? xauthfile : "",
391: display);
392: debug2("x11_get_proto: %s", cmd);
393: f = popen(cmd, "r");
394: if (f && fgets(line, sizeof(line), f) &&
395: sscanf(line, "%*s %511s %511s", proto, data) == 2)
396: got_data = 1;
397: if (f)
398: pclose(f);
1.318 djm 399: free(cmd);
1.279 djm 400: }
1.138 djm 401: }
402:
403: if (do_unlink) {
404: unlink(xauthfile);
405: rmdir(xauthdir);
406: }
407:
1.279 djm 408: /* Don't fall back to fake X11 data for untrusted forwarding */
409: if (!trusted && !got_data) {
410: error("Warning: untrusted X11 forwarding setup failed: "
411: "xauth key data not generated");
412: return -1;
413: }
414:
1.138 djm 415: /*
416: * If we didn't get authentication data, just make up some
417: * data. The forwarding code will check the validity of the
418: * response anyway, and substitute this data. The X11
419: * server, however, will ignore this fake data and use
420: * whatever authentication mechanisms it was using otherwise
421: * for the local connection.
422: */
423: if (!got_data) {
1.288 tedu 424: u_int8_t rnd[16];
425: u_int i;
1.138 djm 426:
427: logit("Warning: No xauth data; "
428: "using fake authentication data for X11 forwarding.");
429: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.288 tedu 430: arc4random_buf(rnd, sizeof(rnd));
431: for (i = 0; i < sizeof(rnd); i++) {
1.138 djm 432: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.288 tedu 433: rnd[i]);
1.138 djm 434: }
435: }
1.279 djm 436:
437: return 0;
1.1 deraadt 438: }
439:
1.13 markus 440: /*
441: * Checks if the client window has changed, and sends a packet about it to
442: * the server if so. The actual change is detected elsewhere (by a software
443: * interrupt on Unix); this just checks the flag and sends a message if
444: * appropriate.
445: */
1.1 deraadt 446:
1.77 itojun 447: static void
1.303 djm 448: client_check_window_change(struct ssh *ssh)
1.1 deraadt 449: {
1.292 djm 450: if (!received_window_change_signal)
1.16 markus 451: return;
452: received_window_change_signal = 0;
1.354 djm 453: debug2_f("changed");
1.303 djm 454: channel_send_window_changes(ssh);
1.1 deraadt 455: }
456:
1.264 markus 457: static int
1.297 markus 458: client_global_request_reply(int type, u_int32_t seq, struct ssh *ssh)
1.117 markus 459: {
1.196 djm 460: struct global_confirm *gc;
461:
462: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 463: return 0;
1.196 djm 464: if (gc->cb != NULL)
1.303 djm 465: gc->cb(ssh, type, seq, gc->ctx);
1.196 djm 466: if (--gc->ref_count <= 0) {
467: TAILQ_REMOVE(&global_confirms, gc, entry);
1.342 jsg 468: freezero(gc, sizeof(*gc));
1.196 djm 469: }
470:
1.320 djm 471: ssh_packet_set_alive_timeouts(ssh, 0);
1.264 markus 472: return 0;
1.117 markus 473: }
474:
475: static void
1.345 dtucker 476: schedule_server_alive_check(void)
477: {
478: if (options.server_alive_interval > 0)
479: server_alive_time = monotime() + options.server_alive_interval;
480: }
481:
482: static void
1.320 djm 483: server_alive_check(struct ssh *ssh)
1.117 markus 484: {
1.320 djm 485: int r;
486:
487: if (ssh_packet_inc_alive_timeouts(ssh) > options.server_alive_count_max) {
1.228 djm 488: logit("Timeout, server %s not responding.", host);
1.176 markus 489: cleanup_exit(255);
490: }
1.320 djm 491: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
492: (r = sshpkt_put_cstring(ssh, "keepalive@openssh.com")) != 0 ||
493: (r = sshpkt_put_u8(ssh, 1)) != 0 || /* boolean: want reply */
494: (r = sshpkt_send(ssh)) != 0)
1.354 djm 495: fatal_fr(r, "send packet");
1.196 djm 496: /* Insert an empty placeholder to maintain ordering */
497: client_register_global_confirm(NULL, NULL);
1.345 dtucker 498: schedule_server_alive_check();
1.117 markus 499: }
500:
1.13 markus 501: /*
502: * Waits until the client can do something (some data becomes available on
503: * one of the file descriptors).
504: */
1.77 itojun 505: static void
1.374 djm 506: client_wait_until_can_do_something(struct ssh *ssh, struct pollfd **pfdp,
507: u_int *npfd_allocp, u_int *npfd_activep, int rekeying,
508: int *conn_in_readyp, int *conn_out_readyp)
1.11 markus 509: {
1.374 djm 510: int timeout_secs, pollwait;
1.345 dtucker 511: time_t minwait_secs = 0, now = monotime();
1.377 djm 512: int ret;
1.374 djm 513: u_int p;
1.117 markus 514:
1.374 djm 515: *conn_in_readyp = *conn_out_readyp = 0;
1.11 markus 516:
1.374 djm 517: /* Prepare channel poll. First two pollfd entries are reserved */
518: channel_prepare_poll(ssh, pfdp, npfd_allocp, npfd_activep, 2,
519: &minwait_secs);
520: if (*npfd_activep < 2)
521: fatal_f("bad npfd %u", *npfd_activep); /* shouldn't happen */
522:
523: /* channel_prepare_poll could have closed the last channel */
1.303 djm 524: if (session_closed && !channel_still_open(ssh) &&
1.320 djm 525: !ssh_packet_have_data_to_write(ssh)) {
1.374 djm 526: /* clear events since we did not call poll() */
527: for (p = 0; p < *npfd_activep; p++)
528: (*pfdp)[p].revents = 0;
1.292 djm 529: return;
1.16 markus 530: }
1.11 markus 531:
1.374 djm 532: /* Monitor server connection on reserved pollfd entries */
533: (*pfdp)[0].fd = connection_in;
534: (*pfdp)[0].events = POLLIN;
535: (*pfdp)[1].fd = connection_out;
536: (*pfdp)[1].events = ssh_packet_have_data_to_write(ssh) ? POLLOUT : 0;
1.11 markus 537:
1.13 markus 538: /*
539: * Wait for something to happen. This will suspend the process until
1.374 djm 540: * some polled descriptor can be read, written, or has some other
1.222 djm 541: * event pending, or a timeout expires.
1.13 markus 542: */
1.11 markus 543:
1.222 djm 544: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.345 dtucker 545: if (options.server_alive_interval > 0)
546: timeout_secs = MAXIMUM(server_alive_time - now, 0);
1.292 djm 547: if (options.rekey_interval > 0 && !rekeying)
1.320 djm 548: timeout_secs = MINIMUM(timeout_secs,
549: ssh_packet_get_rekey_timeout(ssh));
1.303 djm 550: set_control_persist_exit_time(ssh);
1.222 djm 551: if (control_persist_exit_time > 0) {
1.287 deraadt 552: timeout_secs = MINIMUM(timeout_secs,
1.249 dtucker 553: control_persist_exit_time - now);
1.222 djm 554: if (timeout_secs < 0)
555: timeout_secs = 0;
556: }
1.239 djm 557: if (minwait_secs != 0)
1.287 deraadt 558: timeout_secs = MINIMUM(timeout_secs, (int)minwait_secs);
1.222 djm 559: if (timeout_secs == INT_MAX)
1.374 djm 560: pollwait = -1;
561: else if (timeout_secs >= INT_MAX / 1000)
562: pollwait = INT_MAX;
563: else
564: pollwait = timeout_secs * 1000;
565:
566: ret = poll(*pfdp, *npfd_activep, pollwait);
1.222 djm 567:
1.326 deraadt 568: if (ret == -1) {
1.51 markus 569: /*
1.374 djm 570: * We have to clear the events because we return.
1.51 markus 571: * We have to return, because the mainloop checks for the flags
572: * set by the signal handlers.
573: */
1.374 djm 574: for (p = 0; p < *npfd_activep; p++)
575: (*pfdp)[p].revents = 0;
1.11 markus 576: if (errno == EINTR)
577: return;
578: /* Note: we might still have data in the buffers. */
1.377 djm 579: quit_message("poll: %s", strerror(errno));
1.374 djm 580: return;
581: }
582:
583: *conn_in_readyp = (*pfdp)[0].revents != 0;
584: *conn_out_readyp = (*pfdp)[1].revents != 0;
585:
586: if (options.server_alive_interval > 0 && !*conn_in_readyp &&
587: monotime() >= server_alive_time) {
1.249 dtucker 588: /*
1.374 djm 589: * ServerAlive check is needed. We can't rely on the poll
1.345 dtucker 590: * timing out since traffic on the client side such as port
591: * forwards can keep waking it up.
1.249 dtucker 592: */
1.345 dtucker 593: server_alive_check(ssh);
1.374 djm 594: }
1.11 markus 595: }
596:
1.77 itojun 597: static void
1.315 markus 598: client_suspend_self(struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr)
1.1 deraadt 599: {
1.11 markus 600: /* Flush stdout and stderr buffers. */
1.315 markus 601: if (sshbuf_len(bout) > 0)
602: atomicio(vwrite, fileno(stdout), sshbuf_mutable_ptr(bout),
603: sshbuf_len(bout));
604: if (sshbuf_len(berr) > 0)
605: atomicio(vwrite, fileno(stderr), sshbuf_mutable_ptr(berr),
606: sshbuf_len(berr));
1.11 markus 607:
1.233 djm 608: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 609:
1.305 djm 610: sshbuf_reset(bin);
611: sshbuf_reset(bout);
612: sshbuf_reset(berr);
1.11 markus 613:
614: /* Send the suspend signal to the program itself. */
615: kill(getpid(), SIGTSTP);
616:
1.132 djm 617: /* Reset window sizes in case they have changed */
618: received_window_change_signal = 1;
1.11 markus 619:
1.233 djm 620: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 621: }
622:
1.77 itojun 623: static void
1.374 djm 624: client_process_net_input(struct ssh *ssh)
1.11 markus 625: {
1.378 djm 626: int r;
1.11 markus 627:
1.13 markus 628: /*
629: * Read input from the server, and add any such data to the buffer of
630: * the packet subsystem.
631: */
1.374 djm 632: schedule_server_alive_check();
1.378 djm 633: if ((r = ssh_packet_process_read(ssh, connection_in)) == 0)
634: return; /* success */
635: if (r == SSH_ERR_SYSTEM_ERROR) {
636: if (errno == EAGAIN || errno == EINTR)
637: return;
638: if (errno == EPIPE) {
639: quit_message("Connection to %s closed by remote host.",
640: host);
641: return;
642: }
1.11 markus 643: }
1.378 djm 644: quit_message("Read from remote host %s: %s", host, ssh_err(r));
1.17 markus 645: }
1.16 markus 646:
1.97 jakob 647: static void
1.303 djm 648: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 649: {
1.190 djm 650: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
651: char errmsg[256];
1.315 markus 652: int r, tochan;
1.190 djm 653:
1.234 djm 654: /*
655: * If a TTY was explicitly requested, then a failure to allocate
656: * one is fatal.
657: */
658: if (cr->action == CONFIRM_TTY &&
659: (options.request_tty == REQUEST_TTY_FORCE ||
660: options.request_tty == REQUEST_TTY_YES))
661: cr->action = CONFIRM_CLOSE;
662:
1.312 djm 663: /* XXX suppress on mux _client_ quietmode */
1.190 djm 664: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 665: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 666:
667: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
668: debug2("%s request accepted on channel %d",
669: cr->request_type, c->self);
670: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
671: if (tochan) {
672: snprintf(errmsg, sizeof(errmsg),
673: "%s request failed\r\n", cr->request_type);
674: } else {
675: snprintf(errmsg, sizeof(errmsg),
676: "%s request failed on channel %d",
677: cr->request_type, c->self);
678: }
679: /* If error occurred on primary session channel, then exit */
1.234 djm 680: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 681: fatal("%s", errmsg);
1.234 djm 682: /*
683: * If error occurred on mux client, append to
684: * their stderr.
685: */
686: if (tochan) {
1.360 djm 687: debug3_f("channel %d: mux request: %s", c->self,
688: cr->request_type);
1.315 markus 689: if ((r = sshbuf_put(c->extended, errmsg,
690: strlen(errmsg))) != 0)
1.354 djm 691: fatal_fr(r, "sshbuf_put");
1.234 djm 692: } else
1.190 djm 693: error("%s", errmsg);
1.234 djm 694: if (cr->action == CONFIRM_TTY) {
695: /*
696: * If a TTY allocation error occurred, then arrange
697: * for the correct TTY to leave raw mode.
698: */
699: if (c->self == session_ident)
700: leave_raw_mode(0);
701: else
1.303 djm 702: mux_tty_alloc_failed(ssh, c);
1.234 djm 703: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 704: chan_read_failed(ssh, c);
705: chan_write_failed(ssh, c);
1.190 djm 706: }
707: }
1.250 djm 708: free(cr);
1.190 djm 709: }
710:
711: static void
1.303 djm 712: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 713: {
1.250 djm 714: free(ctx);
1.190 djm 715: }
1.129 deraadt 716:
1.236 djm 717: void
1.303 djm 718: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 719: enum confirm_action action)
1.190 djm 720: {
1.255 djm 721: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 722:
1.190 djm 723: cr->request_type = request;
1.234 djm 724: cr->action = action;
1.123 djm 725:
1.303 djm 726: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 727: client_abandon_status_confirm, cr);
1.196 djm 728: }
729:
730: void
731: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
732: {
1.201 djm 733: struct global_confirm *gc, *last_gc;
1.196 djm 734:
735: /* Coalesce identical callbacks */
1.201 djm 736: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
737: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
738: if (++last_gc->ref_count >= INT_MAX)
1.354 djm 739: fatal_f("last_gc->ref_count = %d",
740: last_gc->ref_count);
1.196 djm 741: return;
742: }
743:
1.255 djm 744: gc = xcalloc(1, sizeof(*gc));
1.196 djm 745: gc->cb = cb;
746: gc->ctx = ctx;
747: gc->ref_count = 1;
748: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 749: }
750:
751: static void
1.303 djm 752: process_cmdline(struct ssh *ssh)
1.97 jakob 753: {
754: void (*handler)(int);
1.261 millert 755: char *s, *cmd;
756: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
757: struct Forward fwd;
1.97 jakob 758:
1.257 tedu 759: memset(&fwd, 0, sizeof(fwd));
1.183 djm 760:
1.233 djm 761: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.332 dtucker 762: handler = ssh_signal(SIGINT, SIG_IGN);
1.99 markus 763: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 764: if (s == NULL)
765: goto out;
1.256 deraadt 766: while (isspace((u_char)*s))
1.97 jakob 767: s++;
1.121 djm 768: if (*s == '-')
769: s++; /* Skip cmdline '-', if any */
1.120 dtucker 770: if (*s == '\0')
1.97 jakob 771: goto out;
1.121 djm 772:
1.122 djm 773: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 774: logit("Commands:");
1.164 djm 775: logit(" -L[bind_address:]port:host:hostport "
776: "Request local forward");
777: logit(" -R[bind_address:]port:host:hostport "
778: "Request remote forward");
1.204 stevesk 779: logit(" -D[bind_address:]port "
780: "Request dynamic forward");
1.237 markus 781: logit(" -KL[bind_address:]port "
782: "Cancel local forward");
1.165 stevesk 783: logit(" -KR[bind_address:]port "
1.164 djm 784: "Cancel remote forward");
1.237 markus 785: logit(" -KD[bind_address:]port "
786: "Cancel dynamic forward");
1.146 reyk 787: if (!options.permit_local_command)
788: goto out;
1.164 djm 789: logit(" !args "
790: "Execute local command");
1.146 reyk 791: goto out;
792: }
793:
794: if (*s == '!' && options.permit_local_command) {
795: s++;
796: ssh_local_cmd(s);
1.121 djm 797: goto out;
798: }
799:
800: if (*s == 'K') {
801: delete = 1;
802: s++;
803: }
1.204 stevesk 804: if (*s == 'L')
805: local = 1;
806: else if (*s == 'R')
807: remote = 1;
808: else if (*s == 'D')
809: dynamic = 1;
810: else {
1.109 itojun 811: logit("Invalid command.");
1.97 jakob 812: goto out;
813: }
1.204 stevesk 814:
1.256 deraadt 815: while (isspace((u_char)*++s))
1.179 tedu 816: ;
1.97 jakob 817:
1.217 djm 818: /* XXX update list of forwards in options */
1.121 djm 819: if (delete) {
1.261 millert 820: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
821: if (!parse_forward(&fwd, s, 1, 0)) {
822: logit("Bad forwarding close specification.");
1.121 djm 823: goto out;
824: }
1.237 markus 825: if (remote)
1.303 djm 826: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 827: else if (dynamic)
1.303 djm 828: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 829: 0, &options.fwd_opts) > 0;
1.237 markus 830: else
1.303 djm 831: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 832: CHANNEL_CANCEL_PORT_STATIC,
833: &options.fwd_opts) > 0;
1.237 markus 834: if (!ok) {
1.290 dtucker 835: logit("Unknown port forwarding.");
1.237 markus 836: goto out;
837: }
838: logit("Canceled forwarding.");
1.121 djm 839: } else {
1.209 djm 840: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 841: logit("Bad forwarding specification.");
842: goto out;
843: }
1.204 stevesk 844: if (local || dynamic) {
1.303 djm 845: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 846: &options.fwd_opts)) {
1.121 djm 847: logit("Port forwarding failed.");
848: goto out;
849: }
1.135 djm 850: } else {
1.303 djm 851: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 852: logit("Port forwarding failed.");
853: goto out;
854: }
1.135 djm 855: }
1.121 djm 856: logit("Forwarding port.");
857: }
858:
1.97 jakob 859: out:
1.332 dtucker 860: ssh_signal(SIGINT, handler);
1.233 djm 861: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 862: free(cmd);
863: free(fwd.listen_host);
1.261 millert 864: free(fwd.listen_path);
1.250 djm 865: free(fwd.connect_host);
1.261 millert 866: free(fwd.connect_path);
1.97 jakob 867: }
868:
1.244 dtucker 869: /* reasons to suppress output of an escape command in help output */
870: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 871: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
872: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
873: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.244 dtucker 874: struct escape_help_text {
875: const char *cmd;
876: const char *text;
877: unsigned int flags;
878: };
879: static struct escape_help_text esc_txt[] = {
880: {".", "terminate session", SUPPRESS_MUXMASTER},
881: {".", "terminate connection (and any multiplexed sessions)",
882: SUPPRESS_MUXCLIENT},
1.292 djm 883: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.244 dtucker 884: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1.292 djm 885: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 886: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 887: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
888: {"#", "list forwarded connections", SUPPRESS_NEVER},
889: {"&", "background ssh (when waiting for connections to terminate)",
890: SUPPRESS_MUXCLIENT},
891: {"?", "this message", SUPPRESS_NEVER},
892: };
893:
894: static void
1.315 markus 895: print_escape_help(struct sshbuf *b, int escape_char, int mux_client,
896: int using_stderr)
1.244 dtucker 897: {
898: unsigned int i, suppress_flags;
1.315 markus 899: int r;
1.244 dtucker 900:
1.315 markus 901: if ((r = sshbuf_putf(b,
902: "%c?\r\nSupported escape sequences:\r\n", escape_char)) != 0)
1.354 djm 903: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 904:
1.292 djm 905: suppress_flags =
1.244 dtucker 906: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
907: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
908: (using_stderr ? 0 : SUPPRESS_SYSLOG);
909:
910: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
911: if (esc_txt[i].flags & suppress_flags)
912: continue;
1.315 markus 913: if ((r = sshbuf_putf(b, " %c%-3s - %s\r\n",
914: escape_char, esc_txt[i].cmd, esc_txt[i].text)) != 0)
1.354 djm 915: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 916: }
917:
1.315 markus 918: if ((r = sshbuf_putf(b,
1.246 dtucker 919: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 920: "(Note that escapes are only recognized immediately after "
1.315 markus 921: "newline.)\r\n", escape_char, escape_char)) != 0)
1.354 djm 922: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 923: }
924:
1.314 djm 925: /*
1.296 naddy 926: * Process the characters one by one.
1.195 djm 927: */
1.77 itojun 928: static int
1.303 djm 929: process_escapes(struct ssh *ssh, Channel *c,
1.315 markus 930: struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr,
1.195 djm 931: char *buf, int len)
1.31 markus 932: {
933: pid_t pid;
1.315 markus 934: int r, bytes = 0;
1.42 markus 935: u_int i;
936: u_char ch;
1.31 markus 937: char *s;
1.294 djm 938: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
939: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 940:
1.294 djm 941: if (c->filter_ctx == NULL)
942: return 0;
1.314 djm 943:
1.139 djm 944: if (len <= 0)
945: return (0);
946:
947: for (i = 0; i < (u_int)len; i++) {
1.31 markus 948: /* Get one character at a time. */
949: ch = buf[i];
950:
1.294 djm 951: if (efc->escape_pending) {
1.31 markus 952: /* We have previously seen an escape character. */
953: /* Clear the flag now. */
1.294 djm 954: efc->escape_pending = 0;
1.31 markus 955:
956: /* Process the escaped character. */
957: switch (ch) {
958: case '.':
959: /* Terminate the connection. */
1.315 markus 960: if ((r = sshbuf_putf(berr, "%c.\r\n",
961: efc->escape_char)) != 0)
1.354 djm 962: fatal_fr(r, "sshbuf_putf");
1.217 djm 963: if (c && c->ctl_chan != -1) {
1.303 djm 964: chan_read_failed(ssh, c);
965: chan_write_failed(ssh, c);
966: if (c->detach_user) {
967: c->detach_user(ssh,
968: c->self, NULL);
969: }
1.253 dtucker 970: c->type = SSH_CHANNEL_ABANDONED;
1.315 markus 971: sshbuf_reset(c->input);
1.303 djm 972: chan_ibuf_empty(ssh, c);
1.195 djm 973: return 0;
974: } else
975: quit_pending = 1;
1.31 markus 976: return -1;
977:
978: case 'Z' - 64:
1.195 djm 979: /* XXX support this for mux clients */
1.217 djm 980: if (c && c->ctl_chan != -1) {
1.245 dtucker 981: char b[16];
1.195 djm 982: noescape:
1.245 dtucker 983: if (ch == 'Z' - 64)
984: snprintf(b, sizeof b, "^Z");
985: else
986: snprintf(b, sizeof b, "%c", ch);
1.315 markus 987: if ((r = sshbuf_putf(berr,
1.245 dtucker 988: "%c%s escape not available to "
1.195 djm 989: "multiplexed sessions\r\n",
1.315 markus 990: efc->escape_char, b)) != 0)
1.354 djm 991: fatal_fr(r, "sshbuf_putf");
1.195 djm 992: continue;
993: }
1.197 djm 994: /* Suspend the program. Inform the user */
1.315 markus 995: if ((r = sshbuf_putf(berr,
996: "%c^Z [suspend ssh]\r\n",
997: efc->escape_char)) != 0)
1.354 djm 998: fatal_fr(r, "sshbuf_putf");
1.31 markus 999:
1000: /* Restore terminal modes and suspend. */
1001: client_suspend_self(bin, bout, berr);
1002:
1003: /* We have been continued. */
1004: continue;
1005:
1.111 markus 1006: case 'B':
1.315 markus 1007: if ((r = sshbuf_putf(berr,
1008: "%cB\r\n", efc->escape_char)) != 0)
1.354 djm 1009: fatal_fr(r, "sshbuf_putf");
1.303 djm 1010: channel_request_start(ssh, c->self, "break", 0);
1.315 markus 1011: if ((r = sshpkt_put_u32(ssh, 1000)) != 0 ||
1012: (r = sshpkt_send(ssh)) != 0)
1.354 djm 1013: fatal_fr(r, "send packet");
1.111 markus 1014: continue;
1015:
1.54 markus 1016: case 'R':
1.357 djm 1017: if (ssh->compat & SSH_BUG_NOREKEY)
1.292 djm 1018: logit("Server does not "
1019: "support re-keying");
1020: else
1021: need_rekeying = 1;
1.54 markus 1022: continue;
1023:
1.242 dtucker 1024: case 'V':
1025: /* FALLTHROUGH */
1026: case 'v':
1027: if (c && c->ctl_chan != -1)
1028: goto noescape;
1029: if (!log_is_on_stderr()) {
1.315 markus 1030: if ((r = sshbuf_putf(berr,
1.242 dtucker 1031: "%c%c [Logging to syslog]\r\n",
1.315 markus 1032: efc->escape_char, ch)) != 0)
1.354 djm 1033: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1034: continue;
1035: }
1036: if (ch == 'V' && options.log_level >
1037: SYSLOG_LEVEL_QUIET)
1038: log_change_level(--options.log_level);
1039: if (ch == 'v' && options.log_level <
1040: SYSLOG_LEVEL_DEBUG3)
1041: log_change_level(++options.log_level);
1.315 markus 1042: if ((r = sshbuf_putf(berr,
1.294 djm 1043: "%c%c [LogLevel %s]\r\n",
1044: efc->escape_char, ch,
1.315 markus 1045: log_level_name(options.log_level))) != 0)
1.354 djm 1046: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1047: continue;
1048:
1.31 markus 1049: case '&':
1.217 djm 1050: if (c && c->ctl_chan != -1)
1.195 djm 1051: goto noescape;
1.31 markus 1052: /*
1.197 djm 1053: * Detach the program (continue to serve
1054: * connections, but put in background and no
1055: * more new connections).
1.31 markus 1056: */
1057: /* Restore tty modes. */
1.233 djm 1058: leave_raw_mode(
1059: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1060:
1061: /* Stop listening for new connections. */
1.303 djm 1062: channel_stop_listening(ssh);
1.31 markus 1063:
1.354 djm 1064: if ((r = sshbuf_putf(berr, "%c& "
1065: "[backgrounded]\n", efc->escape_char)) != 0)
1066: fatal_fr(r, "sshbuf_putf");
1.31 markus 1067:
1068: /* Fork into background. */
1069: pid = fork();
1.326 deraadt 1070: if (pid == -1) {
1.31 markus 1071: error("fork: %.100s", strerror(errno));
1072: continue;
1073: }
1074: if (pid != 0) { /* This is the parent. */
1075: /* The parent just exits. */
1076: exit(0);
1077: }
1078: /* The child continues serving connections. */
1.292 djm 1079: /* fake EOF on stdin */
1.315 markus 1080: if ((r = sshbuf_put_u8(bin, 4)) != 0)
1.354 djm 1081: fatal_fr(r, "sshbuf_put_u8");
1.292 djm 1082: return -1;
1.31 markus 1083: case '?':
1.294 djm 1084: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1085: (c && c->ctl_chan != -1),
1086: log_is_on_stderr());
1.31 markus 1087: continue;
1088:
1089: case '#':
1.315 markus 1090: if ((r = sshbuf_putf(berr, "%c#\r\n",
1091: efc->escape_char)) != 0)
1.354 djm 1092: fatal_fr(r, "sshbuf_putf");
1.303 djm 1093: s = channel_open_message(ssh);
1.315 markus 1094: if ((r = sshbuf_put(berr, s, strlen(s))) != 0)
1.354 djm 1095: fatal_fr(r, "sshbuf_put");
1.250 djm 1096: free(s);
1.97 jakob 1097: continue;
1098:
1099: case 'C':
1.217 djm 1100: if (c && c->ctl_chan != -1)
1.206 djm 1101: goto noescape;
1.303 djm 1102: process_cmdline(ssh);
1.31 markus 1103: continue;
1104:
1105: default:
1.294 djm 1106: if (ch != efc->escape_char) {
1.315 markus 1107: if ((r = sshbuf_put_u8(bin,
1108: efc->escape_char)) != 0)
1.354 djm 1109: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1110: bytes++;
1111: }
1112: /* Escaped characters fall through here */
1113: break;
1114: }
1115: } else {
1116: /*
1.197 djm 1117: * The previous character was not an escape char.
1118: * Check if this is an escape.
1.31 markus 1119: */
1.294 djm 1120: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1121: /*
1122: * It is. Set the flag and continue to
1123: * next character.
1124: */
1.294 djm 1125: efc->escape_pending = 1;
1.31 markus 1126: continue;
1127: }
1128: }
1129:
1130: /*
1131: * Normal character. Record whether it was a newline,
1132: * and append it to the buffer.
1133: */
1134: last_was_cr = (ch == '\r' || ch == '\n');
1.315 markus 1135: if ((r = sshbuf_put_u8(bin, ch)) != 0)
1.354 djm 1136: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1137: bytes++;
1138: }
1139: return bytes;
1140: }
1141:
1.13 markus 1142: /*
1.15 markus 1143: * Get packets from the connection input buffer, and process them as long as
1144: * there are packets available.
1145: *
1146: * Any unknown packets received during the actual
1147: * session cause the session to terminate. This is
1148: * intended to make debugging easier since no
1149: * confirmations are sent. Any compatible protocol
1150: * extensions must be negotiated during the
1151: * preparatory phase.
1152: */
1153:
1.77 itojun 1154: static void
1.321 djm 1155: client_process_buffered_input_packets(struct ssh *ssh)
1.15 markus 1156: {
1.321 djm 1157: ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1158: }
1159:
1.31 markus 1160: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1161:
1.195 djm 1162: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1163: void *
1164: client_new_escape_filter_ctx(int escape_char)
1165: {
1166: struct escape_filter_ctx *ret;
1167:
1.255 djm 1168: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1169: ret->escape_pending = 0;
1170: ret->escape_char = escape_char;
1171: return (void *)ret;
1172: }
1173:
1.198 djm 1174: /* Free the escape filter context on channel free */
1175: void
1.303 djm 1176: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1177: {
1.250 djm 1178: free(ctx);
1.198 djm 1179: }
1180:
1.195 djm 1181: int
1.303 djm 1182: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1183: {
1.190 djm 1184: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1185: return 0;
1186:
1.303 djm 1187: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1188: buf, len);
1.30 markus 1189: }
1190:
1.77 itojun 1191: static void
1.303 djm 1192: client_channel_closed(struct ssh *ssh, int id, void *arg)
1.60 markus 1193: {
1.303 djm 1194: channel_cancel_cleanup(ssh, id);
1.60 markus 1195: session_closed = 1;
1.233 djm 1196: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1197: }
1198:
1.15 markus 1199: /*
1.13 markus 1200: * Implements the interactive session with the server. This is called after
1201: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1202: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1203: * used as an escape character for terminating or suspending the session.
1.13 markus 1204: */
1.20 markus 1205: int
1.303 djm 1206: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1207: int ssh2_chan_id)
1.1 deraadt 1208: {
1.374 djm 1209: struct pollfd *pfd = NULL;
1210: u_int npfd_alloc = 0, npfd_active = 0;
1.11 markus 1211: double start_time, total_time;
1.374 djm 1212: int r, len;
1.200 markus 1213: u_int64_t ibytes, obytes;
1.374 djm 1214: int conn_in_ready, conn_out_ready;
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) {
1.373 jsg 1232: debug("pledge: filesystem");
1.277 semarie 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) ||
1.369 djm 1238: options.fork_after_authentication) {
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);
1.46 markus 1256:
1.11 markus 1257: quit_pending = 0;
1258:
1.315 markus 1259: /* Initialize buffer. */
1260: if ((stderr_buffer = sshbuf_new()) == NULL)
1.354 djm 1261: fatal_f("sshbuf_new failed");
1.11 markus 1262:
1.321 djm 1263: client_init_dispatch(ssh);
1.15 markus 1264:
1.105 markus 1265: /*
1266: * Set signal handlers, (e.g. to restore non-blocking mode)
1267: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1268: */
1.332 dtucker 1269: if (ssh_signal(SIGHUP, SIG_IGN) != SIG_IGN)
1270: ssh_signal(SIGHUP, signal_handler);
1271: if (ssh_signal(SIGINT, SIG_IGN) != SIG_IGN)
1272: ssh_signal(SIGINT, signal_handler);
1273: if (ssh_signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1274: ssh_signal(SIGQUIT, signal_handler);
1275: if (ssh_signal(SIGTERM, SIG_IGN) != SIG_IGN)
1276: ssh_signal(SIGTERM, signal_handler);
1277: ssh_signal(SIGWINCH, window_change_handler);
1.11 markus 1278:
1279: if (have_pty)
1.233 djm 1280: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1281:
1.292 djm 1282: session_ident = ssh2_chan_id;
1283: if (session_ident != -1) {
1284: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1285: channel_register_filter(ssh, session_ident,
1.292 djm 1286: client_simple_escape_filter, NULL,
1287: client_filter_cleanup,
1288: client_new_escape_filter_ctx(
1289: escape_char_arg));
1.232 djm 1290: }
1.303 djm 1291: channel_register_cleanup(ssh, session_ident,
1.292 djm 1292: client_channel_closed, 0);
1.48 markus 1293: }
1.345 dtucker 1294:
1295: schedule_server_alive_check();
1.30 markus 1296:
1.11 markus 1297: /* Main loop of the client for the interactive session mode. */
1298: while (!quit_pending) {
1299:
1.13 markus 1300: /* Process buffered packets sent by the server. */
1.321 djm 1301: client_process_buffered_input_packets(ssh);
1.11 markus 1302:
1.303 djm 1303: if (session_closed && !channel_still_open(ssh))
1.60 markus 1304: break;
1305:
1.303 djm 1306: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1307: debug("rekeying in progress");
1.284 djm 1308: } else if (need_rekeying) {
1309: /* manual rekey request */
1310: debug("need rekeying");
1.303 djm 1311: if ((r = kex_start_rekex(ssh)) != 0)
1.354 djm 1312: fatal_fr(r, "kex_start_rekex");
1.284 djm 1313: need_rekeying = 0;
1.56 markus 1314: } else {
1315: /*
1316: * Make packets from buffered channel data, and
1317: * enqueue them for sending to the server.
1318: */
1.320 djm 1319: if (ssh_packet_not_very_much_data_to_write(ssh))
1.303 djm 1320: channel_output_poll(ssh);
1.11 markus 1321:
1.56 markus 1322: /*
1323: * Check if the window size has changed, and buffer a
1324: * message about it to the server if so.
1325: */
1.303 djm 1326: client_check_window_change(ssh);
1.11 markus 1327:
1.56 markus 1328: if (quit_pending)
1329: break;
1330: }
1.13 markus 1331: /*
1332: * Wait until we have something to do (something becomes
1333: * available on one of the descriptors).
1334: */
1.374 djm 1335: client_wait_until_can_do_something(ssh, &pfd, &npfd_alloc,
1336: &npfd_active, ssh_packet_is_rekeying(ssh),
1337: &conn_in_ready, &conn_out_ready);
1.11 markus 1338:
1339: if (quit_pending)
1340: break;
1341:
1.379 djm 1342: /* Do channel operations. */
1343: channel_after_poll(ssh, pfd, npfd_active);
1.11 markus 1344:
1.17 markus 1345: /* Buffer input from the connection. */
1.374 djm 1346: if (conn_in_ready)
1347: client_process_net_input(ssh);
1.17 markus 1348:
1349: if (quit_pending)
1350: break;
1.367 djm 1351:
1352: /* A timeout may have triggered rekeying */
1353: if ((r = ssh_packet_check_rekey(ssh)) != 0)
1354: fatal_fr(r, "cannot start rekeying");
1.11 markus 1355:
1.197 djm 1356: /*
1357: * Send as much buffered packet data as possible to the
1358: * sender.
1359: */
1.374 djm 1360: if (conn_out_ready) {
1.338 djm 1361: if ((r = ssh_packet_write_poll(ssh)) != 0) {
1362: sshpkt_fatal(ssh, r,
1363: "%s: ssh_packet_write_poll", __func__);
1364: }
1365: }
1.222 djm 1366:
1367: /*
1368: * If we are a backgrounded control master, and the
1369: * timeout has expired without any active client
1370: * connections, then quit.
1371: */
1372: if (control_persist_exit_time > 0) {
1.251 dtucker 1373: if (monotime() >= control_persist_exit_time) {
1.222 djm 1374: debug("ControlPersist timeout expired");
1375: break;
1376: }
1377: }
1.11 markus 1378: }
1.374 djm 1379: free(pfd);
1.11 markus 1380:
1381: /* Terminate the session. */
1382:
1383: /* Stop watching for window change. */
1.332 dtucker 1384: ssh_signal(SIGWINCH, SIG_DFL);
1.211 andreas 1385:
1.320 djm 1386: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
1387: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_BY_APPLICATION)) != 0 ||
1388: (r = sshpkt_put_cstring(ssh, "disconnected by user")) != 0 ||
1389: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language tag */
1390: (r = sshpkt_send(ssh)) != 0 ||
1391: (r = ssh_packet_write_wait(ssh)) != 0)
1.354 djm 1392: fatal_fr(r, "send disconnect");
1.11 markus 1393:
1.303 djm 1394: channel_free_all(ssh);
1.11 markus 1395:
1.75 markus 1396: if (have_pty)
1.233 djm 1397: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.116 dtucker 1398:
1399: /*
1400: * If there was no shell or command requested, there will be no remote
1401: * exit status to be returned. In that case, clear error code if the
1402: * connection was deliberately terminated at this end.
1403: */
1.370 djm 1404: if (options.session_type == SESSION_TYPE_NONE &&
1405: received_signal == SIGTERM) {
1.116 dtucker 1406: received_signal = 0;
1407: exit_status = 0;
1408: }
1.75 markus 1409:
1.301 dtucker 1410: if (received_signal) {
1411: verbose("Killed by signal %d.", (int) received_signal);
1.359 djm 1412: cleanup_exit(255);
1.301 dtucker 1413: }
1.75 markus 1414:
1.13 markus 1415: /*
1416: * In interactive mode (with pseudo tty) display a message indicating
1417: * that the connection has been closed.
1418: */
1.377 djm 1419: if (have_pty && options.log_level >= SYSLOG_LEVEL_INFO)
1420: quit_message("Connection to %s closed.", host);
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: }
1.372 djm 1593: if ((r = ssh_agent_bind_hostkey(sock, ssh->kex->initial_hostkey,
1594: ssh->kex->session_id, ssh->kex->initial_sig, 1)) == 0)
1595: debug_f("bound agent to hostkey");
1596: else
1597: debug2_fr(r, "ssh_agent_bind_hostkey");
1598:
1.303 djm 1599: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1600: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1601: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1602: "authentication agent connection", 1);
1.82 markus 1603: c->force_drain = 1;
1.40 markus 1604: return c;
1.180 djm 1605: }
1606:
1.306 djm 1607: char *
1.303 djm 1608: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1.343 djm 1609: int local_tun, int remote_tun, channel_open_fn *cb, void *cbctx)
1.180 djm 1610: {
1611: Channel *c;
1.320 djm 1612: int r, fd;
1.306 djm 1613: char *ifname = NULL;
1.180 djm 1614:
1615: if (tun_mode == SSH_TUNMODE_NO)
1616: return 0;
1617:
1618: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1619:
1620: /* Open local tunnel device */
1.306 djm 1621: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1622: error("Tunnel device open failed.");
1.306 djm 1623: return NULL;
1.180 djm 1624: }
1.306 djm 1625: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1626:
1.303 djm 1627: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1628: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1629: c->datagram = 1;
1.343 djm 1630:
1631: if (cb != NULL)
1632: channel_register_open_confirm(ssh, c->self, cb, cbctx);
1.180 djm 1633:
1.320 djm 1634: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1635: (r = sshpkt_put_cstring(ssh, "tun@openssh.com")) != 0 ||
1636: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1637: (r = sshpkt_put_u32(ssh, c->local_window_max)) != 0 ||
1638: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1639: (r = sshpkt_put_u32(ssh, tun_mode)) != 0 ||
1640: (r = sshpkt_put_u32(ssh, remote_tun)) != 0 ||
1641: (r = sshpkt_send(ssh)) != 0)
1.321 djm 1642: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.180 djm 1643:
1.306 djm 1644: return ifname;
1.40 markus 1645: }
1646:
1.22 markus 1647: /* XXXX move to generic input handler */
1.264 markus 1648: static int
1.297 markus 1649: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1650: {
1651: Channel *c = NULL;
1.320 djm 1652: char *ctype = NULL;
1653: int r;
1654: u_int rchan;
1655: size_t len;
1656: u_int rmaxpack, rwindow;
1657:
1658: if ((r = sshpkt_get_cstring(ssh, &ctype, &len)) != 0 ||
1659: (r = sshpkt_get_u32(ssh, &rchan)) != 0 ||
1660: (r = sshpkt_get_u32(ssh, &rwindow)) != 0 ||
1661: (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0)
1662: goto out;
1.22 markus 1663:
1.24 markus 1664: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1665: ctype, rchan, rwindow, rmaxpack);
1666:
1.40 markus 1667: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1668: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1669: rmaxpack);
1.261 millert 1670: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1671: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1672: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1673: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1674: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1675: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1676: }
1.289 markus 1677: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1678: debug3("proxied to downstream: %s", ctype);
1679: } else if (c != NULL) {
1.22 markus 1680: debug("confirm %s", ctype);
1681: c->remote_id = rchan;
1.304 djm 1682: c->have_remote_id = 1;
1.22 markus 1683: c->remote_window = rwindow;
1684: c->remote_maxpacket = rmaxpack;
1.69 markus 1685: if (c->type != SSH_CHANNEL_CONNECTING) {
1.320 djm 1686: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1687: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1688: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1689: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1690: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1691: (r = sshpkt_send(ssh)) != 0)
1692: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.69 markus 1693: }
1.22 markus 1694: } else {
1695: debug("failure %s", ctype);
1.320 djm 1696: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
1697: (r = sshpkt_put_u32(ssh, rchan)) != 0 ||
1698: (r = sshpkt_put_u32(ssh, SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED)) != 0 ||
1699: (r = sshpkt_put_cstring(ssh, "open failed")) != 0 ||
1700: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1701: (r = sshpkt_send(ssh)) != 0)
1702: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.22 markus 1703: }
1.320 djm 1704: r = 0;
1705: out:
1.250 djm 1706: free(ctype);
1.320 djm 1707: return r;
1.22 markus 1708: }
1.267 djm 1709:
1.264 markus 1710: static int
1.297 markus 1711: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1712: {
1713: Channel *c = NULL;
1.320 djm 1714: char *rtype = NULL;
1715: u_char reply;
1716: u_int id, exitval;
1717: int r, success = 0;
1718:
1719: if ((r = sshpkt_get_u32(ssh, &id)) != 0)
1720: return r;
1721: if (id <= INT_MAX)
1722: c = channel_lookup(ssh, id);
1.297 markus 1723: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1724: return 0;
1.320 djm 1725: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
1726: (r = sshpkt_get_u8(ssh, &reply)) != 0)
1727: goto out;
1.48 markus 1728:
1.320 djm 1729: debug("client_input_channel_req: channel %u rtype %s reply %d",
1.48 markus 1730: id, rtype, reply);
1731:
1.320 djm 1732: if (c == NULL) {
1.197 djm 1733: error("client_input_channel_req: channel %d: "
1734: "unknown channel", id);
1.193 markus 1735: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1.320 djm 1736: if ((r = sshpkt_get_end(ssh)) != 0)
1737: goto out;
1.303 djm 1738: chan_rcvd_eow(ssh, c);
1.48 markus 1739: } else if (strcmp(rtype, "exit-status") == 0) {
1.320 djm 1740: if ((r = sshpkt_get_u32(ssh, &exitval)) != 0)
1741: goto out;
1.217 djm 1742: if (c->ctl_chan != -1) {
1.303 djm 1743: mux_exit_message(ssh, c, exitval);
1.215 djm 1744: success = 1;
1.320 djm 1745: } else if ((int)id == session_ident) {
1.215 djm 1746: /* Record exit value of local session */
1.123 djm 1747: success = 1;
1748: exit_status = exitval;
1.215 djm 1749: } else {
1.218 djm 1750: /* Probably for a mux channel that has already closed */
1.354 djm 1751: debug_f("no sink for exit-status on channel %d",
1752: id);
1.123 djm 1753: }
1.320 djm 1754: if ((r = sshpkt_get_end(ssh)) != 0)
1755: goto out;
1.48 markus 1756: }
1.259 djm 1757: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1758: if (!c->have_remote_id)
1.354 djm 1759: fatal_f("channel %d: no remote_id", c->self);
1.320 djm 1760: if ((r = sshpkt_start(ssh, success ?
1761: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE)) != 0 ||
1762: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1763: (r = sshpkt_send(ssh)) != 0)
1764: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.48 markus 1765: }
1.320 djm 1766: r = 0;
1767: out:
1.250 djm 1768: free(rtype);
1.320 djm 1769: return r;
1.48 markus 1770: }
1.267 djm 1771:
1.269 djm 1772: struct hostkeys_update_ctx {
1773: /* The hostname and (optionally) IP address string for the server */
1774: char *host_str, *ip_str;
1775:
1776: /*
1777: * Keys received from the server and a flag for each indicating
1778: * whether they already exist in known_hosts.
1.351 djm 1779: * keys_match is filled in by hostkeys_find() and later (for new
1.269 djm 1780: * keys) by client_global_hostkeys_private_confirm().
1781: */
1782: struct sshkey **keys;
1.351 djm 1783: u_int *keys_match; /* mask of HKF_MATCH_* from hostfile.h */
1784: int *keys_verified; /* flag for new keys verified by server */
1785: size_t nkeys, nnew, nincomplete; /* total, new keys, incomplete match */
1.269 djm 1786:
1787: /*
1788: * Keys that are in known_hosts, but were not present in the update
1789: * from the server (i.e. scheduled to be deleted).
1790: * Filled in by hostkeys_find().
1791: */
1792: struct sshkey **old_keys;
1793: size_t nold;
1.347 djm 1794:
1795: /* Various special cases. */
1.350 djm 1796: int complex_hostspec; /* wildcard or manual pattern-list host name */
1.347 djm 1797: int ca_available; /* saw CA key for this host */
1.352 djm 1798: int old_key_seen; /* saw old key with other name/addr */
1.353 djm 1799: int other_name_seen; /* saw key with other name/addr */
1.269 djm 1800: };
1801:
1802: static void
1803: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1804: {
1805: size_t i;
1806:
1807: if (ctx == NULL)
1808: return;
1809: for (i = 0; i < ctx->nkeys; i++)
1810: sshkey_free(ctx->keys[i]);
1811: free(ctx->keys);
1.351 djm 1812: free(ctx->keys_match);
1813: free(ctx->keys_verified);
1.269 djm 1814: for (i = 0; i < ctx->nold; i++)
1815: sshkey_free(ctx->old_keys[i]);
1816: free(ctx->old_keys);
1817: free(ctx->host_str);
1818: free(ctx->ip_str);
1819: free(ctx);
1820: }
1821:
1.350 djm 1822: /*
1823: * Returns non-zero if a known_hosts hostname list is not of a form that
1824: * can be handled by UpdateHostkeys. These include wildcard hostnames and
1825: * hostnames lists that do not follow the form host[,ip].
1826: */
1827: static int
1828: hostspec_is_complex(const char *hosts)
1829: {
1830: char *cp;
1831:
1832: /* wildcard */
1833: if (strchr(hosts, '*') != NULL || strchr(hosts, '?') != NULL)
1834: return 1;
1835: /* single host/ip = ok */
1836: if ((cp = strchr(hosts, ',')) == NULL)
1837: return 0;
1838: /* more than two entries on the line */
1839: if (strchr(cp + 1, ',') != NULL)
1840: return 1;
1841: /* XXX maybe parse cp+1 and ensure it is an IP? */
1842: return 0;
1843: }
1844:
1.352 djm 1845: /* callback to search for ctx->keys in known_hosts */
1.269 djm 1846: static int
1847: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1848: {
1849: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1850: size_t i;
1851: struct sshkey **tmp;
1852:
1.353 djm 1853: if (l->key == NULL)
1.269 djm 1854: return 0;
1.353 djm 1855: if (l->status != HKF_STATUS_MATCHED) {
1856: /* Record if one of the keys appears on a non-matching line */
1857: for (i = 0; i < ctx->nkeys; i++) {
1858: if (sshkey_equal(l->key, ctx->keys[i])) {
1859: ctx->other_name_seen = 1;
1.354 djm 1860: debug3_f("found %s key under different "
1861: "name/addr at %s:%ld",
1.353 djm 1862: sshkey_ssh_name(ctx->keys[i]),
1863: l->path, l->linenum);
1864: return 0;
1865: }
1866: }
1867: return 0;
1868: }
1869: /* Don't proceed if revocation or CA markers are present */
1870: /* XXX relax this */
1871: if (l->marker != MRK_NONE) {
1.354 djm 1872: debug3_f("hostkeys file %s:%ld has CA/revocation marker",
1873: l->path, l->linenum);
1.353 djm 1874: ctx->complex_hostspec = 1;
1875: return 0;
1876: }
1877:
1.355 djm 1878: /* If CheckHostIP is enabled, then check for mismatched hostname/addr */
1879: if (ctx->ip_str != NULL && strchr(l->hosts, ',') != NULL) {
1880: if ((l->match & HKF_MATCH_HOST) == 0) {
1881: /* Record if address matched a different hostname. */
1882: ctx->other_name_seen = 1;
1883: debug3_f("found address %s against different hostname "
1884: "at %s:%ld", ctx->ip_str, l->path, l->linenum);
1885: return 0;
1886: } else if ((l->match & HKF_MATCH_IP) == 0) {
1887: /* Record if hostname matched a different address. */
1888: ctx->other_name_seen = 1;
1889: debug3_f("found hostname %s against different address "
1890: "at %s:%ld", ctx->host_str, l->path, l->linenum);
1891: }
1.353 djm 1892: }
1.269 djm 1893:
1.350 djm 1894: /*
1895: * UpdateHostkeys is skipped for wildcard host names and hostnames
1896: * that contain more than two entries (ssh never writes these).
1897: */
1898: if (hostspec_is_complex(l->hosts)) {
1.354 djm 1899: debug3_f("hostkeys file %s:%ld complex host specification",
1900: l->path, l->linenum);
1.350 djm 1901: ctx->complex_hostspec = 1;
1.347 djm 1902: return 0;
1903: }
1904:
1.269 djm 1905: /* Mark off keys we've already seen for this host */
1906: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 1907: if (!sshkey_equal(l->key, ctx->keys[i]))
1908: continue;
1.354 djm 1909: debug3_f("found %s key at %s:%ld",
1.351 djm 1910: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1911: ctx->keys_match[i] |= l->match;
1912: return 0;
1.269 djm 1913: }
1914: /* This line contained a key that not offered by the server */
1.354 djm 1915: debug3_f("deprecated %s key at %s:%ld", sshkey_ssh_name(l->key),
1916: l->path, l->linenum);
1.299 deraadt 1917: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1918: sizeof(*ctx->old_keys))) == NULL)
1.354 djm 1919: fatal_f("recallocarray failed nold = %zu", ctx->nold);
1.269 djm 1920: ctx->old_keys = tmp;
1921: ctx->old_keys[ctx->nold++] = l->key;
1922: l->key = NULL;
1923:
1924: return 0;
1925: }
1926:
1.352 djm 1927: /* callback to search for ctx->old_keys in known_hosts under other names */
1928: static int
1929: hostkeys_check_old(struct hostkey_foreach_line *l, void *_ctx)
1930: {
1931: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1932: size_t i;
1933: int hashed;
1934:
1935: /* only care about lines that *don't* match the active host spec */
1936: if (l->status == HKF_STATUS_MATCHED || l->key == NULL)
1937: return 0;
1938:
1939: hashed = l->match & (HKF_MATCH_HOST_HASHED|HKF_MATCH_IP_HASHED);
1940: for (i = 0; i < ctx->nold; i++) {
1941: if (!sshkey_equal(l->key, ctx->old_keys[i]))
1942: continue;
1.354 djm 1943: debug3_f("found deprecated %s key at %s:%ld as %s",
1.364 djm 1944: sshkey_ssh_name(ctx->old_keys[i]), l->path, l->linenum,
1.352 djm 1945: hashed ? "[HASHED]" : l->hosts);
1946: ctx->old_key_seen = 1;
1947: break;
1948: }
1949: return 0;
1950: }
1951:
1952: /*
1953: * Check known_hosts files for deprecated keys under other names. Returns 0
1954: * on success or -1 on failure. Updates ctx->old_key_seen if deprecated keys
1955: * exist under names other than the active hostname/IP.
1956: */
1957: static int
1958: check_old_keys_othernames(struct hostkeys_update_ctx *ctx)
1959: {
1960: size_t i;
1961: int r;
1962:
1.354 djm 1963: debug2_f("checking for %zu deprecated keys", ctx->nold);
1.352 djm 1964: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 1965: debug3_f("searching %s for %s / %s",
1.352 djm 1966: options.user_hostfiles[i], ctx->host_str,
1967: ctx->ip_str ? ctx->ip_str : "(none)");
1968: if ((r = hostkeys_foreach(options.user_hostfiles[i],
1969: hostkeys_check_old, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 1970: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.352 djm 1971: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 1972: debug_f("hostkeys file %s does not exist",
1973: options.user_hostfiles[i]);
1.352 djm 1974: continue;
1975: }
1.354 djm 1976: error_fr(r, "hostkeys_foreach failed for %s",
1977: options.user_hostfiles[i]);
1.352 djm 1978: return -1;
1979: }
1980: }
1981: return 0;
1982: }
1983:
1.269 djm 1984: static void
1.337 djm 1985: hostkey_change_preamble(LogLevel loglevel)
1.269 djm 1986: {
1.336 djm 1987: do_log2(loglevel, "The server has updated its host keys.");
1988: do_log2(loglevel, "These changes were verified by the server's "
1989: "existing trusted key.");
1990: }
1991:
1992: static void
1993: update_known_hosts(struct hostkeys_update_ctx *ctx)
1994: {
1995: int r, was_raw = 0, first = 1;
1996: int asking = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK;
1997: LogLevel loglevel = asking ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1.269 djm 1998: char *fp, *response;
1999: size_t i;
1.333 djm 2000: struct stat sb;
1.269 djm 2001:
2002: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2003: if (!ctx->keys_verified[i])
1.269 djm 2004: continue;
2005: if ((fp = sshkey_fingerprint(ctx->keys[i],
2006: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2007: fatal_f("sshkey_fingerprint failed");
1.336 djm 2008: if (first && asking)
1.337 djm 2009: hostkey_change_preamble(loglevel);
1.269 djm 2010: do_log2(loglevel, "Learned new hostkey: %s %s",
2011: sshkey_type(ctx->keys[i]), fp);
1.336 djm 2012: first = 0;
1.269 djm 2013: free(fp);
2014: }
2015: for (i = 0; i < ctx->nold; i++) {
2016: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2017: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2018: fatal_f("sshkey_fingerprint failed");
1.336 djm 2019: if (first && asking)
1.337 djm 2020: hostkey_change_preamble(loglevel);
1.269 djm 2021: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2022: sshkey_type(ctx->old_keys[i]), fp);
1.336 djm 2023: first = 0;
1.269 djm 2024: free(fp);
2025: }
2026: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2027: if (get_saved_tio() != NULL) {
2028: leave_raw_mode(1);
2029: was_raw = 1;
2030: }
1.269 djm 2031: response = NULL;
2032: for (i = 0; !quit_pending && i < 3; i++) {
2033: free(response);
2034: response = read_passphrase("Accept updated hostkeys? "
2035: "(yes/no): ", RP_ECHO);
2036: if (strcasecmp(response, "yes") == 0)
2037: break;
2038: else if (quit_pending || response == NULL ||
2039: strcasecmp(response, "no") == 0) {
2040: options.update_hostkeys = 0;
2041: break;
2042: } else {
2043: do_log2(loglevel, "Please enter "
2044: "\"yes\" or \"no\"");
2045: }
2046: }
2047: if (quit_pending || i >= 3 || response == NULL)
2048: options.update_hostkeys = 0;
2049: free(response);
1.271 djm 2050: if (was_raw)
2051: enter_raw_mode(1);
1.269 djm 2052: }
1.333 djm 2053: if (options.update_hostkeys == 0)
2054: return;
1.269 djm 2055: /*
2056: * Now that all the keys are verified, we can go ahead and replace
2057: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2058: * cancel the operation).
2059: */
1.333 djm 2060: for (i = 0; i < options.num_user_hostfiles; i++) {
2061: /*
2062: * NB. keys are only added to hostfiles[0], for the rest we
2063: * just delete the hostname entries.
2064: */
2065: if (stat(options.user_hostfiles[i], &sb) != 0) {
2066: if (errno == ENOENT) {
1.354 djm 2067: debug_f("known hosts file %s does not "
2068: "exist", options.user_hostfiles[i]);
1.333 djm 2069: } else {
1.354 djm 2070: error_f("known hosts file %s "
2071: "inaccessible: %s",
2072: options.user_hostfiles[i], strerror(errno));
1.333 djm 2073: }
2074: continue;
2075: }
2076: if ((r = hostfile_replace_entries(options.user_hostfiles[i],
2077: ctx->host_str, ctx->ip_str,
2078: i == 0 ? ctx->keys : NULL, i == 0 ? ctx->nkeys : 0,
2079: options.hash_known_hosts, 0,
2080: options.fingerprint_hash)) != 0) {
1.354 djm 2081: error_fr(r, "hostfile_replace_entries failed for %s",
2082: options.user_hostfiles[i]);
1.333 djm 2083: }
2084: }
1.269 djm 2085: }
2086:
2087: static void
1.303 djm 2088: client_global_hostkeys_private_confirm(struct ssh *ssh, int type,
2089: u_int32_t seq, void *_ctx)
1.269 djm 2090: {
2091: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2092: size_t i, ndone;
2093: struct sshbuf *signdata;
1.375 djm 2094: int r, plaintype;
1.269 djm 2095: const u_char *sig;
1.375 djm 2096: const char *rsa_kexalg = NULL;
2097: char *alg = NULL;
1.269 djm 2098: size_t siglen;
2099:
2100: if (ctx->nnew == 0)
1.354 djm 2101: fatal_f("ctx->nnew == 0"); /* sanity */
1.269 djm 2102: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2103: error("Server failed to confirm ownership of "
2104: "private host keys");
2105: hostkeys_update_ctx_free(ctx);
2106: return;
2107: }
1.375 djm 2108: if (sshkey_type_plain(sshkey_type_from_name(
2109: ssh->kex->hostkey_alg)) == KEY_RSA)
2110: rsa_kexalg = ssh->kex->hostkey_alg;
1.269 djm 2111: if ((signdata = sshbuf_new()) == NULL)
1.354 djm 2112: fatal_f("sshbuf_new failed");
1.269 djm 2113: /*
2114: * Expect a signature for each of the ctx->nnew private keys we
2115: * haven't seen before. They will be in the same order as the
1.351 djm 2116: * ctx->keys where the corresponding ctx->keys_match[i] == 0.
1.269 djm 2117: */
2118: for (ndone = i = 0; i < ctx->nkeys; i++) {
1.351 djm 2119: if (ctx->keys_match[i])
1.269 djm 2120: continue;
1.375 djm 2121: plaintype = sshkey_type_plain(ctx->keys[i]->type);
1.269 djm 2122: /* Prepare data to be signed: session ID, unique string, key */
2123: sshbuf_reset(signdata);
1.270 djm 2124: if ( (r = sshbuf_put_cstring(signdata,
2125: "hostkeys-prove-00@openssh.com")) != 0 ||
1.358 djm 2126: (r = sshbuf_put_stringb(signdata,
2127: ssh->kex->session_id)) != 0 ||
1.269 djm 2128: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1.354 djm 2129: fatal_fr(r, "compose signdata");
1.269 djm 2130: /* Extract and verify signature */
2131: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1.354 djm 2132: error_fr(r, "parse sig");
1.269 djm 2133: goto out;
2134: }
1.375 djm 2135: if ((r = sshkey_get_sigtype(sig, siglen, &alg)) != 0) {
2136: error_fr(r, "server gave unintelligible signature "
2137: "for %s key %zu", sshkey_type(ctx->keys[i]), i);
2138: goto out;
2139: }
1.309 djm 2140: /*
1.375 djm 2141: * Special case for RSA keys: if a RSA hostkey was negotiated,
2142: * then use its signature type for verification of RSA hostkey
2143: * proofs. Otherwise, accept only RSA-SHA256/512 signatures.
1.309 djm 2144: */
1.375 djm 2145: if (plaintype == KEY_RSA && rsa_kexalg == NULL &&
2146: match_pattern_list(alg, HOSTKEY_PROOF_RSA_ALGS, 0) != 1) {
2147: debug_f("server used untrusted RSA signature algorithm "
2148: "%s for key %zu, disregarding", alg, i);
2149: free(alg);
2150: /* zap the key from the list */
2151: sshkey_free(ctx->keys[i]);
2152: ctx->keys[i] = NULL;
2153: ndone++;
2154: continue;
2155: }
2156: debug3_f("verify %s key %zu using sigalg %s",
2157: sshkey_type(ctx->keys[i]), i, alg);
2158: free(alg);
1.269 djm 2159: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 2160: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.375 djm 2161: plaintype == KEY_RSA ? rsa_kexalg : NULL, 0, NULL)) != 0) {
1.361 djm 2162: error_fr(r, "server gave bad signature for %s key %zu",
1.354 djm 2163: sshkey_type(ctx->keys[i]), i);
1.269 djm 2164: goto out;
2165: }
2166: /* Key is good. Mark it as 'seen' */
1.351 djm 2167: ctx->keys_verified[i] = 1;
1.269 djm 2168: ndone++;
2169: }
1.354 djm 2170: /* Shouldn't happen */
1.269 djm 2171: if (ndone != ctx->nnew)
1.354 djm 2172: fatal_f("ndone != ctx->nnew (%zu / %zu)", ndone, ctx->nnew);
1.320 djm 2173: if ((r = sshpkt_get_end(ssh)) != 0) {
1.354 djm 2174: error_f("protocol error");
1.320 djm 2175: goto out;
2176: }
1.269 djm 2177:
2178: /* Make the edits to known_hosts */
2179: update_known_hosts(ctx);
2180: out:
2181: hostkeys_update_ctx_free(ctx);
2182: }
2183:
1.267 djm 2184: /*
1.291 djm 2185: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
2186: * Made slightly less trivial by the multiple RSA signature algorithm names.
2187: */
2188: static int
2189: key_accepted_by_hostkeyalgs(const struct sshkey *key)
2190: {
2191: const char *ktype = sshkey_ssh_name(key);
1.331 dtucker 2192: const char *hostkeyalgs = options.hostkeyalgorithms;
1.291 djm 2193:
2194: if (key == NULL || key->type == KEY_UNSPEC)
2195: return 0;
2196: if (key->type == KEY_RSA &&
2197: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
2198: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
2199: return 1;
2200: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
2201: }
2202:
2203: /*
1.270 djm 2204: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2205: * the server's hostkeys. The keys are checked against the user's
2206: * HostkeyAlgorithms preference before they are accepted.
2207: */
2208: static int
1.321 djm 2209: client_input_hostkeys(struct ssh *ssh)
1.267 djm 2210: {
2211: const u_char *blob = NULL;
1.269 djm 2212: size_t i, len = 0;
1.267 djm 2213: struct sshbuf *buf = NULL;
1.269 djm 2214: struct sshkey *key = NULL, **tmp;
2215: int r;
2216: char *fp;
1.267 djm 2217: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2218: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2219: struct hostkeys_update_ctx *ctx = NULL;
1.351 djm 2220: u_int want;
1.267 djm 2221:
2222: if (hostkeys_seen)
1.354 djm 2223: fatal_f("server already sent hostkeys");
1.269 djm 2224: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2225: options.batch_mode)
2226: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2227: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2228: return 1;
1.272 djm 2229:
2230: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2231: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2232: sshkey_free(key);
2233: key = NULL;
1.269 djm 2234: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
1.354 djm 2235: error_fr(r, "parse key");
1.269 djm 2236: goto out;
2237: }
1.270 djm 2238: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
1.354 djm 2239: do_log2_fr(r, r == SSH_ERR_KEY_TYPE_UNKNOWN ?
1.335 djm 2240: SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR,
1.354 djm 2241: "convert key");
1.335 djm 2242: continue;
1.270 djm 2243: }
1.267 djm 2244: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2245: SSH_FP_DEFAULT);
1.354 djm 2246: debug3_f("received %s key %s", sshkey_type(key), fp);
1.267 djm 2247: free(fp);
1.275 markus 2248:
1.291 djm 2249: if (!key_accepted_by_hostkeyalgs(key)) {
1.354 djm 2250: debug3_f("%s key not permitted by "
2251: "HostkeyAlgorithms", sshkey_ssh_name(key));
1.267 djm 2252: continue;
2253: }
1.269 djm 2254: /* Skip certs */
2255: if (sshkey_is_cert(key)) {
1.354 djm 2256: debug3_f("%s key is a certificate; skipping",
2257: sshkey_ssh_name(key));
1.269 djm 2258: continue;
2259: }
2260: /* Ensure keys are unique */
2261: for (i = 0; i < ctx->nkeys; i++) {
2262: if (sshkey_equal(key, ctx->keys[i])) {
1.354 djm 2263: error_f("received duplicated %s host key",
2264: sshkey_ssh_name(key));
1.269 djm 2265: goto out;
2266: }
2267: }
2268: /* Key is good, record it */
1.299 deraadt 2269: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2270: sizeof(*ctx->keys))) == NULL)
1.354 djm 2271: fatal_f("recallocarray failed nkeys = %zu",
2272: ctx->nkeys);
1.269 djm 2273: ctx->keys = tmp;
2274: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2275: key = NULL;
2276: }
2277:
1.269 djm 2278: if (ctx->nkeys == 0) {
1.354 djm 2279: debug_f("server sent no hostkeys");
1.267 djm 2280: goto out;
2281: }
1.270 djm 2282:
1.351 djm 2283: if ((ctx->keys_match = calloc(ctx->nkeys,
2284: sizeof(*ctx->keys_match))) == NULL ||
2285: (ctx->keys_verified = calloc(ctx->nkeys,
2286: sizeof(*ctx->keys_verified))) == NULL)
1.354 djm 2287: fatal_f("calloc failed");
1.267 djm 2288:
1.268 djm 2289: get_hostfile_hostname_ipaddr(host,
2290: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2291: options.port, &ctx->host_str,
2292: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2293:
1.269 djm 2294: /* Find which keys we already know about. */
1.333 djm 2295: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2296: debug_f("searching %s for %s / %s",
1.339 dtucker 2297: options.user_hostfiles[i], ctx->host_str,
1.340 dtucker 2298: ctx->ip_str ? ctx->ip_str : "(none)");
1.333 djm 2299: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2300: hostkeys_find, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2301: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.333 djm 2302: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2303: debug_f("hostkeys file %s does not exist",
2304: options.user_hostfiles[i]);
1.333 djm 2305: continue;
2306: }
1.354 djm 2307: error_fr(r, "hostkeys_foreach failed for %s",
2308: options.user_hostfiles[i]);
1.333 djm 2309: goto out;
2310: }
1.267 djm 2311: }
2312:
1.269 djm 2313: /* Figure out if we have any new keys to add */
1.351 djm 2314: ctx->nnew = ctx->nincomplete = 0;
2315: want = HKF_MATCH_HOST | ( options.check_host_ip ? HKF_MATCH_IP : 0);
1.269 djm 2316: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2317: if (ctx->keys_match[i] == 0)
1.269 djm 2318: ctx->nnew++;
1.351 djm 2319: if ((ctx->keys_match[i] & want) != want)
2320: ctx->nincomplete++;
1.269 djm 2321: }
2322:
1.354 djm 2323: debug3_f("%zu server keys: %zu new, %zu retained, "
2324: "%zu incomplete match. %zu to remove", ctx->nkeys, ctx->nnew,
2325: ctx->nkeys - ctx->nnew - ctx->nincomplete,
1.351 djm 2326: ctx->nincomplete, ctx->nold);
1.269 djm 2327:
1.353 djm 2328: if (ctx->nnew == 0 && ctx->nold == 0) {
1.354 djm 2329: debug_f("no new or deprecated keys from server");
1.353 djm 2330: goto out;
2331: }
2332:
2333: /* Various reasons why we cannot proceed with the update */
2334: if (ctx->complex_hostspec) {
1.354 djm 2335: debug_f("CA/revocation marker, manual host list or wildcard "
2336: "host pattern found, skipping UserKnownHostsFile update");
1.353 djm 2337: goto out;
2338: }
2339: if (ctx->other_name_seen) {
1.354 djm 2340: debug_f("host key found matching a different name/address, "
2341: "skipping UserKnownHostsFile update");
1.347 djm 2342: goto out;
1.352 djm 2343: }
2344: /*
2345: * If removing keys, check whether they appear under different
2346: * names/addresses and refuse to proceed if they do. This avoids
2347: * cases such as hosts with multiple names becoming inconsistent
2348: * with regards to CheckHostIP entries.
2349: * XXX UpdateHostkeys=force to override this (and other) checks?
2350: */
2351: if (ctx->nold != 0) {
2352: if (check_old_keys_othernames(ctx) != 0)
2353: goto out; /* error already logged */
2354: if (ctx->old_key_seen) {
1.354 djm 2355: debug_f("key(s) for %s%s%s exist under other names; "
2356: "skipping UserKnownHostsFile update",
1.352 djm 2357: ctx->host_str, ctx->ip_str == NULL ? "" : ",",
2358: ctx->ip_str == NULL ? "" : ctx->ip_str);
2359: goto out;
2360: }
2361: }
2362:
1.353 djm 2363: if (ctx->nnew == 0) {
1.351 djm 2364: /*
2365: * We have some keys to remove or fix matching for.
2366: * We can proceed to do this without requiring a fresh proof
2367: * from the server.
2368: */
1.269 djm 2369: update_known_hosts(ctx);
1.353 djm 2370: goto out;
2371: }
2372: /*
2373: * We have received previously-unseen keys from the server.
2374: * Ask the server to confirm ownership of the private halves.
2375: */
1.354 djm 2376: debug3_f("asking server to prove ownership for %zu keys", ctx->nnew);
1.353 djm 2377: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2378: (r = sshpkt_put_cstring(ssh,
2379: "hostkeys-prove-00@openssh.com")) != 0 ||
2380: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
1.354 djm 2381: fatal_fr(r, "prepare hostkeys-prove");
1.353 djm 2382: if ((buf = sshbuf_new()) == NULL)
1.354 djm 2383: fatal_f("sshbuf_new");
1.353 djm 2384: for (i = 0; i < ctx->nkeys; i++) {
2385: if (ctx->keys_match[i])
2386: continue;
2387: sshbuf_reset(buf);
2388: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0 ||
1.354 djm 2389: (r = sshpkt_put_stringb(ssh, buf)) != 0)
2390: fatal_fr(r, "assemble hostkeys-prove");
1.269 djm 2391: }
1.353 djm 2392: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2393: fatal_fr(r, "send hostkeys-prove");
1.353 djm 2394: client_register_global_confirm(
2395: client_global_hostkeys_private_confirm, ctx);
2396: ctx = NULL; /* will be freed in callback */
1.269 djm 2397:
1.267 djm 2398: /* Success */
2399: out:
1.269 djm 2400: hostkeys_update_ctx_free(ctx);
1.267 djm 2401: sshkey_free(key);
2402: sshbuf_free(buf);
1.269 djm 2403: /*
2404: * NB. Return success for all cases. The server doesn't need to know
2405: * what the client does with its hosts file.
2406: */
2407: return 1;
1.267 djm 2408: }
2409:
1.264 markus 2410: static int
1.297 markus 2411: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2412: {
2413: char *rtype;
1.320 djm 2414: u_char want_reply;
2415: int r, success = 0;
1.95 markus 2416:
1.320 djm 2417: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
2418: (r = sshpkt_get_u8(ssh, &want_reply)) != 0)
2419: goto out;
1.117 markus 2420: debug("client_input_global_request: rtype %s want_reply %d",
2421: rtype, want_reply);
1.270 djm 2422: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.321 djm 2423: success = client_input_hostkeys(ssh);
1.95 markus 2424: if (want_reply) {
1.320 djm 2425: if ((r = sshpkt_start(ssh, success ? SSH2_MSG_REQUEST_SUCCESS :
2426: SSH2_MSG_REQUEST_FAILURE)) != 0 ||
2427: (r = sshpkt_send(ssh)) != 0 ||
2428: (r = ssh_packet_write_wait(ssh)) != 0)
2429: goto out;
1.95 markus 2430: }
1.320 djm 2431: r = 0;
2432: out:
1.250 djm 2433: free(rtype);
1.320 djm 2434: return r;
1.95 markus 2435: }
1.22 markus 2436:
1.354 djm 2437: static void
2438: client_send_env(struct ssh *ssh, int id, const char *name, const char *val)
2439: {
2440: int r;
2441:
2442: debug("channel %d: setting env %s = \"%s\"", id, name, val);
2443: channel_request_start(ssh, id, "env", 0);
2444: if ((r = sshpkt_put_cstring(ssh, name)) != 0 ||
2445: (r = sshpkt_put_cstring(ssh, val)) != 0 ||
2446: (r = sshpkt_send(ssh)) != 0)
2447: fatal_fr(r, "send setenv");
2448: }
2449:
1.123 djm 2450: void
1.303 djm 2451: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.315 markus 2452: const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd,
2453: char **env)
1.123 djm 2454: {
1.380 ! djm 2455: size_t i, j, len;
! 2456: int matched, r;
1.313 djm 2457: char *name, *val;
1.132 djm 2458: Channel *c = NULL;
1.123 djm 2459:
1.354 djm 2460: debug2_f("id %d", id);
1.123 djm 2461:
1.303 djm 2462: if ((c = channel_lookup(ssh, id)) == NULL)
1.354 djm 2463: fatal_f("channel %d: unknown channel", id);
1.224 djm 2464:
1.320 djm 2465: ssh_packet_set_interactive(ssh, want_tty,
1.224 djm 2466: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2467:
1.123 djm 2468: if (want_tty) {
2469: struct winsize ws;
2470:
2471: /* Store window size in the packet. */
1.326 deraadt 2472: if (ioctl(in_fd, TIOCGWINSZ, &ws) == -1)
1.123 djm 2473: memset(&ws, 0, sizeof(ws));
2474:
1.303 djm 2475: channel_request_start(ssh, id, "pty-req", 1);
2476: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.320 djm 2477: if ((r = sshpkt_put_cstring(ssh, term != NULL ? term : ""))
2478: != 0 ||
2479: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
2480: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
2481: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
2482: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0)
1.354 djm 2483: fatal_fr(r, "build pty-req");
1.194 djm 2484: if (tiop == NULL)
2485: tiop = get_saved_tio();
1.316 markus 2486: ssh_tty_make_modes(ssh, -1, tiop);
1.320 djm 2487: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2488: fatal_fr(r, "send pty-req");
1.123 djm 2489: /* XXX wait for reply */
1.132 djm 2490: c->client_tty = 1;
1.123 djm 2491: }
2492:
2493: /* Transfer any environment variables from client to server */
1.126 djm 2494: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2495: debug("Sending environment.");
1.126 djm 2496: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2497: /* Split */
1.126 djm 2498: name = xstrdup(env[i]);
1.123 djm 2499: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2500: free(name);
1.123 djm 2501: continue;
2502: }
2503: *val++ = '\0';
2504:
2505: matched = 0;
2506: for (j = 0; j < options.num_send_env; j++) {
2507: if (match_pattern(name, options.send_env[j])) {
2508: matched = 1;
2509: break;
2510: }
2511: }
2512: if (!matched) {
2513: debug3("Ignored env %s", name);
1.250 djm 2514: free(name);
1.123 djm 2515: continue;
2516: }
1.354 djm 2517: client_send_env(ssh, id, name, val);
1.250 djm 2518: free(name);
1.123 djm 2519: }
1.313 djm 2520: }
2521: for (i = 0; i < options.num_setenv; i++) {
2522: /* Split */
2523: name = xstrdup(options.setenv[i]);
2524: if ((val = strchr(name, '=')) == NULL) {
2525: free(name);
2526: continue;
2527: }
2528: *val++ = '\0';
1.354 djm 2529: client_send_env(ssh, id, name, val);
1.313 djm 2530: free(name);
1.123 djm 2531: }
2532:
1.315 markus 2533: len = sshbuf_len(cmd);
1.123 djm 2534: if (len > 0) {
2535: if (len > 900)
2536: len = 900;
2537: if (want_subsystem) {
1.190 djm 2538: debug("Sending subsystem: %.*s",
1.380 ! djm 2539: (int)len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2540: channel_request_start(ssh, id, "subsystem", 1);
2541: client_expect_confirm(ssh, id, "subsystem",
2542: CONFIRM_CLOSE);
1.123 djm 2543: } else {
1.190 djm 2544: debug("Sending command: %.*s",
1.380 ! djm 2545: (int)len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2546: channel_request_start(ssh, id, "exec", 1);
2547: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2548: }
1.320 djm 2549: if ((r = sshpkt_put_stringb(ssh, cmd)) != 0 ||
2550: (r = sshpkt_send(ssh)) != 0)
1.354 djm 2551: fatal_fr(r, "send command");
1.123 djm 2552: } else {
1.303 djm 2553: channel_request_start(ssh, id, "shell", 1);
2554: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.354 djm 2555: if ((r = sshpkt_send(ssh)) != 0)
2556: fatal_fr(r, "send shell");
1.123 djm 2557: }
2558: }
2559:
1.77 itojun 2560: static void
1.321 djm 2561: client_init_dispatch(struct ssh *ssh)
1.16 markus 2562: {
1.321 djm 2563: ssh_dispatch_init(ssh, &dispatch_protocol_error);
1.100 markus 2564:
1.321 djm 2565: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2566: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2567: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2568: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2569: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2570: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2571: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2572: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2573: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2574: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2575: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2576: ssh_dispatch_set(ssh, SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2577:
2578: /* rekeying */
1.321 djm 2579: ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2580:
2581: /* global request reply messages */
1.321 djm 2582: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2583: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2584: }
2585:
2586: void
2587: client_stop_mux(void)
2588: {
2589: if (options.control_path != NULL && muxserver_sock != -1)
2590: unlink(options.control_path);
2591: /*
1.247 dtucker 2592: * If we are in persist mode, or don't have a shell, signal that we
2593: * should close when all active channels are closed.
1.232 djm 2594: */
1.366 djm 2595: if (options.control_persist || options.session_type == SESSION_TYPE_NONE) {
1.232 djm 2596: session_closed = 1;
1.235 djm 2597: setproctitle("[stopped mux]");
2598: }
1.113 markus 2599: }
2600:
2601: /* client specific fatal cleanup */
2602: void
1.114 markus 2603: cleanup_exit(int i)
1.113 markus 2604: {
1.233 djm 2605: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.192 djm 2606: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2607: unlink(options.control_path);
1.223 djm 2608: ssh_kill_proxy_command();
1.114 markus 2609: _exit(i);
1.1 deraadt 2610: }
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