Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.383
1.383 ! djm 1: /* $OpenBSD: clientloop.c,v 1.382 2022/11/10 23:03:10 dtucker Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.189 djm 68: #include <sys/queue.h>
1.150 stevesk 69:
1.155 stevesk 70: #include <ctype.h>
1.168 stevesk 71: #include <errno.h>
1.151 stevesk 72: #include <paths.h>
1.374 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 {
1.382 dtucker 840: /* -R specs can be both dynamic or not, so check both. */
841: if (remote) {
842: if (!parse_forward(&fwd, s, 0, remote) &&
843: !parse_forward(&fwd, s, 1, remote)) {
844: logit("Bad remote forwarding specification.");
845: goto out;
846: }
847: } else if (!parse_forward(&fwd, s, dynamic, remote)) {
848: logit("Bad local forwarding specification.");
1.121 djm 849: goto out;
850: }
1.204 stevesk 851: if (local || dynamic) {
1.303 djm 852: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 853: &options.fwd_opts)) {
1.121 djm 854: logit("Port forwarding failed.");
855: goto out;
856: }
1.135 djm 857: } else {
1.303 djm 858: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 859: logit("Port forwarding failed.");
860: goto out;
861: }
1.135 djm 862: }
1.121 djm 863: logit("Forwarding port.");
864: }
865:
1.97 jakob 866: out:
1.332 dtucker 867: ssh_signal(SIGINT, handler);
1.233 djm 868: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 869: free(cmd);
870: free(fwd.listen_host);
1.261 millert 871: free(fwd.listen_path);
1.250 djm 872: free(fwd.connect_host);
1.261 millert 873: free(fwd.connect_path);
1.97 jakob 874: }
875:
1.244 dtucker 876: /* reasons to suppress output of an escape command in help output */
877: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 878: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
879: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
880: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.383 ! djm 881: #define SUPPRESS_NOCMDLINE 8 /* don't show when cmdline disabled*/
1.244 dtucker 882: struct escape_help_text {
883: const char *cmd;
884: const char *text;
885: unsigned int flags;
886: };
887: static struct escape_help_text esc_txt[] = {
888: {".", "terminate session", SUPPRESS_MUXMASTER},
889: {".", "terminate connection (and any multiplexed sessions)",
890: SUPPRESS_MUXCLIENT},
1.292 djm 891: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.383 ! djm 892: {"C", "open a command line", SUPPRESS_MUXCLIENT|SUPPRESS_NOCMDLINE},
1.292 djm 893: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 894: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 895: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
896: {"#", "list forwarded connections", SUPPRESS_NEVER},
897: {"&", "background ssh (when waiting for connections to terminate)",
898: SUPPRESS_MUXCLIENT},
899: {"?", "this message", SUPPRESS_NEVER},
900: };
901:
902: static void
1.315 markus 903: print_escape_help(struct sshbuf *b, int escape_char, int mux_client,
904: int using_stderr)
1.244 dtucker 905: {
906: unsigned int i, suppress_flags;
1.315 markus 907: int r;
1.244 dtucker 908:
1.315 markus 909: if ((r = sshbuf_putf(b,
910: "%c?\r\nSupported escape sequences:\r\n", escape_char)) != 0)
1.354 djm 911: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 912:
1.292 djm 913: suppress_flags =
1.244 dtucker 914: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
915: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
1.383 ! djm 916: (using_stderr ? 0 : SUPPRESS_SYSLOG) |
! 917: (options.enable_escape_commandline == 0 ? SUPPRESS_NOCMDLINE : 0);
1.244 dtucker 918:
919: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
920: if (esc_txt[i].flags & suppress_flags)
921: continue;
1.315 markus 922: if ((r = sshbuf_putf(b, " %c%-3s - %s\r\n",
923: escape_char, esc_txt[i].cmd, esc_txt[i].text)) != 0)
1.354 djm 924: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 925: }
926:
1.315 markus 927: if ((r = sshbuf_putf(b,
1.246 dtucker 928: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 929: "(Note that escapes are only recognized immediately after "
1.315 markus 930: "newline.)\r\n", escape_char, escape_char)) != 0)
1.354 djm 931: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 932: }
933:
1.314 djm 934: /*
1.296 naddy 935: * Process the characters one by one.
1.195 djm 936: */
1.77 itojun 937: static int
1.303 djm 938: process_escapes(struct ssh *ssh, Channel *c,
1.315 markus 939: struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr,
1.195 djm 940: char *buf, int len)
1.31 markus 941: {
942: pid_t pid;
1.315 markus 943: int r, bytes = 0;
1.42 markus 944: u_int i;
945: u_char ch;
1.31 markus 946: char *s;
1.294 djm 947: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
948: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 949:
1.294 djm 950: if (c->filter_ctx == NULL)
951: return 0;
1.314 djm 952:
1.139 djm 953: if (len <= 0)
954: return (0);
955:
956: for (i = 0; i < (u_int)len; i++) {
1.31 markus 957: /* Get one character at a time. */
958: ch = buf[i];
959:
1.294 djm 960: if (efc->escape_pending) {
1.31 markus 961: /* We have previously seen an escape character. */
962: /* Clear the flag now. */
1.294 djm 963: efc->escape_pending = 0;
1.31 markus 964:
965: /* Process the escaped character. */
966: switch (ch) {
967: case '.':
968: /* Terminate the connection. */
1.315 markus 969: if ((r = sshbuf_putf(berr, "%c.\r\n",
970: efc->escape_char)) != 0)
1.354 djm 971: fatal_fr(r, "sshbuf_putf");
1.217 djm 972: if (c && c->ctl_chan != -1) {
1.303 djm 973: chan_read_failed(ssh, c);
974: chan_write_failed(ssh, c);
975: if (c->detach_user) {
976: c->detach_user(ssh,
977: c->self, NULL);
978: }
1.253 dtucker 979: c->type = SSH_CHANNEL_ABANDONED;
1.315 markus 980: sshbuf_reset(c->input);
1.303 djm 981: chan_ibuf_empty(ssh, c);
1.195 djm 982: return 0;
983: } else
984: quit_pending = 1;
1.31 markus 985: return -1;
986:
987: case 'Z' - 64:
1.195 djm 988: /* XXX support this for mux clients */
1.217 djm 989: if (c && c->ctl_chan != -1) {
1.245 dtucker 990: char b[16];
1.195 djm 991: noescape:
1.245 dtucker 992: if (ch == 'Z' - 64)
993: snprintf(b, sizeof b, "^Z");
994: else
995: snprintf(b, sizeof b, "%c", ch);
1.315 markus 996: if ((r = sshbuf_putf(berr,
1.245 dtucker 997: "%c%s escape not available to "
1.195 djm 998: "multiplexed sessions\r\n",
1.315 markus 999: efc->escape_char, b)) != 0)
1.354 djm 1000: fatal_fr(r, "sshbuf_putf");
1.195 djm 1001: continue;
1002: }
1.197 djm 1003: /* Suspend the program. Inform the user */
1.315 markus 1004: if ((r = sshbuf_putf(berr,
1005: "%c^Z [suspend ssh]\r\n",
1006: efc->escape_char)) != 0)
1.354 djm 1007: fatal_fr(r, "sshbuf_putf");
1.31 markus 1008:
1009: /* Restore terminal modes and suspend. */
1010: client_suspend_self(bin, bout, berr);
1011:
1012: /* We have been continued. */
1013: continue;
1014:
1.111 markus 1015: case 'B':
1.315 markus 1016: if ((r = sshbuf_putf(berr,
1017: "%cB\r\n", efc->escape_char)) != 0)
1.354 djm 1018: fatal_fr(r, "sshbuf_putf");
1.303 djm 1019: channel_request_start(ssh, c->self, "break", 0);
1.315 markus 1020: if ((r = sshpkt_put_u32(ssh, 1000)) != 0 ||
1021: (r = sshpkt_send(ssh)) != 0)
1.354 djm 1022: fatal_fr(r, "send packet");
1.111 markus 1023: continue;
1024:
1.54 markus 1025: case 'R':
1.357 djm 1026: if (ssh->compat & SSH_BUG_NOREKEY)
1.292 djm 1027: logit("Server does not "
1028: "support re-keying");
1029: else
1030: need_rekeying = 1;
1.54 markus 1031: continue;
1032:
1.242 dtucker 1033: case 'V':
1034: /* FALLTHROUGH */
1035: case 'v':
1036: if (c && c->ctl_chan != -1)
1037: goto noescape;
1038: if (!log_is_on_stderr()) {
1.315 markus 1039: if ((r = sshbuf_putf(berr,
1.242 dtucker 1040: "%c%c [Logging to syslog]\r\n",
1.315 markus 1041: efc->escape_char, ch)) != 0)
1.354 djm 1042: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1043: continue;
1044: }
1045: if (ch == 'V' && options.log_level >
1046: SYSLOG_LEVEL_QUIET)
1047: log_change_level(--options.log_level);
1048: if (ch == 'v' && options.log_level <
1049: SYSLOG_LEVEL_DEBUG3)
1050: log_change_level(++options.log_level);
1.315 markus 1051: if ((r = sshbuf_putf(berr,
1.294 djm 1052: "%c%c [LogLevel %s]\r\n",
1053: efc->escape_char, ch,
1.315 markus 1054: log_level_name(options.log_level))) != 0)
1.354 djm 1055: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1056: continue;
1057:
1.31 markus 1058: case '&':
1.217 djm 1059: if (c && c->ctl_chan != -1)
1.195 djm 1060: goto noescape;
1.31 markus 1061: /*
1.197 djm 1062: * Detach the program (continue to serve
1063: * connections, but put in background and no
1064: * more new connections).
1.31 markus 1065: */
1066: /* Restore tty modes. */
1.233 djm 1067: leave_raw_mode(
1068: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1069:
1070: /* Stop listening for new connections. */
1.303 djm 1071: channel_stop_listening(ssh);
1.31 markus 1072:
1.354 djm 1073: if ((r = sshbuf_putf(berr, "%c& "
1074: "[backgrounded]\n", efc->escape_char)) != 0)
1075: fatal_fr(r, "sshbuf_putf");
1.31 markus 1076:
1077: /* Fork into background. */
1078: pid = fork();
1.326 deraadt 1079: if (pid == -1) {
1.31 markus 1080: error("fork: %.100s", strerror(errno));
1081: continue;
1082: }
1083: if (pid != 0) { /* This is the parent. */
1084: /* The parent just exits. */
1085: exit(0);
1086: }
1087: /* The child continues serving connections. */
1.292 djm 1088: /* fake EOF on stdin */
1.315 markus 1089: if ((r = sshbuf_put_u8(bin, 4)) != 0)
1.354 djm 1090: fatal_fr(r, "sshbuf_put_u8");
1.292 djm 1091: return -1;
1.31 markus 1092: case '?':
1.294 djm 1093: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1094: (c && c->ctl_chan != -1),
1095: log_is_on_stderr());
1.31 markus 1096: continue;
1097:
1098: case '#':
1.315 markus 1099: if ((r = sshbuf_putf(berr, "%c#\r\n",
1100: efc->escape_char)) != 0)
1.354 djm 1101: fatal_fr(r, "sshbuf_putf");
1.303 djm 1102: s = channel_open_message(ssh);
1.315 markus 1103: if ((r = sshbuf_put(berr, s, strlen(s))) != 0)
1.354 djm 1104: fatal_fr(r, "sshbuf_put");
1.250 djm 1105: free(s);
1.97 jakob 1106: continue;
1107:
1108: case 'C':
1.217 djm 1109: if (c && c->ctl_chan != -1)
1.206 djm 1110: goto noescape;
1.383 ! djm 1111: if (options.enable_escape_commandline == 0) {
! 1112: if ((r = sshbuf_putf(berr,
! 1113: "commandline disabled\r\n")) != 0)
! 1114: fatal_fr(r, "sshbuf_putf");
! 1115: continue;
! 1116: }
1.303 djm 1117: process_cmdline(ssh);
1.31 markus 1118: continue;
1119:
1120: default:
1.294 djm 1121: if (ch != efc->escape_char) {
1.315 markus 1122: if ((r = sshbuf_put_u8(bin,
1123: efc->escape_char)) != 0)
1.354 djm 1124: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1125: bytes++;
1126: }
1127: /* Escaped characters fall through here */
1128: break;
1129: }
1130: } else {
1131: /*
1.197 djm 1132: * The previous character was not an escape char.
1133: * Check if this is an escape.
1.31 markus 1134: */
1.294 djm 1135: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1136: /*
1137: * It is. Set the flag and continue to
1138: * next character.
1139: */
1.294 djm 1140: efc->escape_pending = 1;
1.31 markus 1141: continue;
1142: }
1143: }
1144:
1145: /*
1146: * Normal character. Record whether it was a newline,
1147: * and append it to the buffer.
1148: */
1149: last_was_cr = (ch == '\r' || ch == '\n');
1.315 markus 1150: if ((r = sshbuf_put_u8(bin, ch)) != 0)
1.354 djm 1151: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1152: bytes++;
1153: }
1154: return bytes;
1155: }
1156:
1.13 markus 1157: /*
1.15 markus 1158: * Get packets from the connection input buffer, and process them as long as
1159: * there are packets available.
1160: *
1161: * Any unknown packets received during the actual
1162: * session cause the session to terminate. This is
1163: * intended to make debugging easier since no
1164: * confirmations are sent. Any compatible protocol
1165: * extensions must be negotiated during the
1166: * preparatory phase.
1167: */
1168:
1.77 itojun 1169: static void
1.321 djm 1170: client_process_buffered_input_packets(struct ssh *ssh)
1.15 markus 1171: {
1.321 djm 1172: ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1173: }
1174:
1.31 markus 1175: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1176:
1.195 djm 1177: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1178: void *
1179: client_new_escape_filter_ctx(int escape_char)
1180: {
1181: struct escape_filter_ctx *ret;
1182:
1.255 djm 1183: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1184: ret->escape_pending = 0;
1185: ret->escape_char = escape_char;
1186: return (void *)ret;
1187: }
1188:
1.198 djm 1189: /* Free the escape filter context on channel free */
1190: void
1.303 djm 1191: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1192: {
1.250 djm 1193: free(ctx);
1.198 djm 1194: }
1195:
1.195 djm 1196: int
1.303 djm 1197: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1198: {
1.190 djm 1199: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1200: return 0;
1201:
1.303 djm 1202: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1203: buf, len);
1.30 markus 1204: }
1205:
1.77 itojun 1206: static void
1.303 djm 1207: client_channel_closed(struct ssh *ssh, int id, void *arg)
1.60 markus 1208: {
1.303 djm 1209: channel_cancel_cleanup(ssh, id);
1.60 markus 1210: session_closed = 1;
1.233 djm 1211: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1212: }
1213:
1.15 markus 1214: /*
1.13 markus 1215: * Implements the interactive session with the server. This is called after
1216: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1217: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1218: * used as an escape character for terminating or suspending the session.
1.13 markus 1219: */
1.20 markus 1220: int
1.303 djm 1221: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1222: int ssh2_chan_id)
1.1 deraadt 1223: {
1.374 djm 1224: struct pollfd *pfd = NULL;
1225: u_int npfd_alloc = 0, npfd_active = 0;
1.11 markus 1226: double start_time, total_time;
1.374 djm 1227: int r, len;
1.200 markus 1228: u_int64_t ibytes, obytes;
1.374 djm 1229: int conn_in_ready, conn_out_ready;
1.11 markus 1230:
1231: debug("Entering interactive session.");
1.277 semarie 1232:
1.278 semarie 1233: if (options.control_master &&
1.286 djm 1234: !option_clear_or_none(options.control_path)) {
1.278 semarie 1235: debug("pledge: id");
1.327 mestre 1236: if (pledge("stdio rpath wpath cpath unix inet dns recvfd sendfd proc exec id tty",
1.278 semarie 1237: NULL) == -1)
1.354 djm 1238: fatal_f("pledge(): %s", strerror(errno));
1.278 semarie 1239:
1240: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1241: debug("pledge: exec");
1242: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1243: NULL) == -1)
1.354 djm 1244: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1245:
1246: } else if (options.update_hostkeys) {
1.373 jsg 1247: debug("pledge: filesystem");
1.277 semarie 1248: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1249: NULL) == -1)
1.354 djm 1250: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1251:
1.286 djm 1252: } else if (!option_clear_or_none(options.proxy_command) ||
1.369 djm 1253: options.fork_after_authentication) {
1.277 semarie 1254: debug("pledge: proc");
1255: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1.354 djm 1256: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1257:
1258: } else {
1259: debug("pledge: network");
1.300 mestre 1260: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.354 djm 1261: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1262: }
1.11 markus 1263:
1.307 dtucker 1264: start_time = monotime_double();
1.11 markus 1265:
1266: /* Initialize variables. */
1267: last_was_cr = 1;
1268: exit_status = -1;
1.320 djm 1269: connection_in = ssh_packet_get_connection_in(ssh);
1270: connection_out = ssh_packet_get_connection_out(ssh);
1.46 markus 1271:
1.11 markus 1272: quit_pending = 0;
1273:
1.315 markus 1274: /* Initialize buffer. */
1275: if ((stderr_buffer = sshbuf_new()) == NULL)
1.354 djm 1276: fatal_f("sshbuf_new failed");
1.11 markus 1277:
1.321 djm 1278: client_init_dispatch(ssh);
1.15 markus 1279:
1.105 markus 1280: /*
1281: * Set signal handlers, (e.g. to restore non-blocking mode)
1282: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1283: */
1.332 dtucker 1284: if (ssh_signal(SIGHUP, SIG_IGN) != SIG_IGN)
1285: ssh_signal(SIGHUP, signal_handler);
1286: if (ssh_signal(SIGINT, SIG_IGN) != SIG_IGN)
1287: ssh_signal(SIGINT, signal_handler);
1288: if (ssh_signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1289: ssh_signal(SIGQUIT, signal_handler);
1290: if (ssh_signal(SIGTERM, SIG_IGN) != SIG_IGN)
1291: ssh_signal(SIGTERM, signal_handler);
1292: ssh_signal(SIGWINCH, window_change_handler);
1.11 markus 1293:
1294: if (have_pty)
1.233 djm 1295: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1296:
1.292 djm 1297: session_ident = ssh2_chan_id;
1298: if (session_ident != -1) {
1299: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1300: channel_register_filter(ssh, session_ident,
1.292 djm 1301: client_simple_escape_filter, NULL,
1302: client_filter_cleanup,
1303: client_new_escape_filter_ctx(
1304: escape_char_arg));
1.232 djm 1305: }
1.303 djm 1306: channel_register_cleanup(ssh, session_ident,
1.292 djm 1307: client_channel_closed, 0);
1.48 markus 1308: }
1.345 dtucker 1309:
1310: schedule_server_alive_check();
1.30 markus 1311:
1.11 markus 1312: /* Main loop of the client for the interactive session mode. */
1313: while (!quit_pending) {
1314:
1.13 markus 1315: /* Process buffered packets sent by the server. */
1.321 djm 1316: client_process_buffered_input_packets(ssh);
1.11 markus 1317:
1.303 djm 1318: if (session_closed && !channel_still_open(ssh))
1.60 markus 1319: break;
1320:
1.303 djm 1321: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1322: debug("rekeying in progress");
1.284 djm 1323: } else if (need_rekeying) {
1324: /* manual rekey request */
1325: debug("need rekeying");
1.303 djm 1326: if ((r = kex_start_rekex(ssh)) != 0)
1.354 djm 1327: fatal_fr(r, "kex_start_rekex");
1.284 djm 1328: need_rekeying = 0;
1.56 markus 1329: } else {
1330: /*
1331: * Make packets from buffered channel data, and
1332: * enqueue them for sending to the server.
1333: */
1.320 djm 1334: if (ssh_packet_not_very_much_data_to_write(ssh))
1.303 djm 1335: channel_output_poll(ssh);
1.11 markus 1336:
1.56 markus 1337: /*
1338: * Check if the window size has changed, and buffer a
1339: * message about it to the server if so.
1340: */
1.303 djm 1341: client_check_window_change(ssh);
1.11 markus 1342:
1.56 markus 1343: if (quit_pending)
1344: break;
1345: }
1.13 markus 1346: /*
1347: * Wait until we have something to do (something becomes
1348: * available on one of the descriptors).
1349: */
1.374 djm 1350: client_wait_until_can_do_something(ssh, &pfd, &npfd_alloc,
1351: &npfd_active, ssh_packet_is_rekeying(ssh),
1352: &conn_in_ready, &conn_out_ready);
1.11 markus 1353:
1354: if (quit_pending)
1355: break;
1356:
1.379 djm 1357: /* Do channel operations. */
1358: channel_after_poll(ssh, pfd, npfd_active);
1.11 markus 1359:
1.17 markus 1360: /* Buffer input from the connection. */
1.374 djm 1361: if (conn_in_ready)
1362: client_process_net_input(ssh);
1.17 markus 1363:
1364: if (quit_pending)
1365: break;
1.367 djm 1366:
1367: /* A timeout may have triggered rekeying */
1368: if ((r = ssh_packet_check_rekey(ssh)) != 0)
1369: fatal_fr(r, "cannot start rekeying");
1.11 markus 1370:
1.197 djm 1371: /*
1372: * Send as much buffered packet data as possible to the
1373: * sender.
1374: */
1.374 djm 1375: if (conn_out_ready) {
1.338 djm 1376: if ((r = ssh_packet_write_poll(ssh)) != 0) {
1377: sshpkt_fatal(ssh, r,
1378: "%s: ssh_packet_write_poll", __func__);
1379: }
1380: }
1.222 djm 1381:
1382: /*
1383: * If we are a backgrounded control master, and the
1384: * timeout has expired without any active client
1385: * connections, then quit.
1386: */
1387: if (control_persist_exit_time > 0) {
1.251 dtucker 1388: if (monotime() >= control_persist_exit_time) {
1.222 djm 1389: debug("ControlPersist timeout expired");
1390: break;
1391: }
1392: }
1.11 markus 1393: }
1.374 djm 1394: free(pfd);
1.11 markus 1395:
1396: /* Terminate the session. */
1397:
1398: /* Stop watching for window change. */
1.332 dtucker 1399: ssh_signal(SIGWINCH, SIG_DFL);
1.211 andreas 1400:
1.320 djm 1401: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
1402: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_BY_APPLICATION)) != 0 ||
1403: (r = sshpkt_put_cstring(ssh, "disconnected by user")) != 0 ||
1404: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language tag */
1405: (r = sshpkt_send(ssh)) != 0 ||
1406: (r = ssh_packet_write_wait(ssh)) != 0)
1.354 djm 1407: fatal_fr(r, "send disconnect");
1.11 markus 1408:
1.303 djm 1409: channel_free_all(ssh);
1.11 markus 1410:
1.75 markus 1411: if (have_pty)
1.233 djm 1412: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.116 dtucker 1413:
1414: /*
1415: * If there was no shell or command requested, there will be no remote
1416: * exit status to be returned. In that case, clear error code if the
1417: * connection was deliberately terminated at this end.
1418: */
1.370 djm 1419: if (options.session_type == SESSION_TYPE_NONE &&
1420: received_signal == SIGTERM) {
1.116 dtucker 1421: received_signal = 0;
1422: exit_status = 0;
1423: }
1.75 markus 1424:
1.301 dtucker 1425: if (received_signal) {
1426: verbose("Killed by signal %d.", (int) received_signal);
1.359 djm 1427: cleanup_exit(255);
1.301 dtucker 1428: }
1.75 markus 1429:
1.13 markus 1430: /*
1431: * In interactive mode (with pseudo tty) display a message indicating
1432: * that the connection has been closed.
1433: */
1.377 djm 1434: if (have_pty && options.log_level >= SYSLOG_LEVEL_INFO)
1435: quit_message("Connection to %s closed.", host);
1.70 markus 1436:
1.11 markus 1437: /* Output any buffered data for stderr. */
1.315 markus 1438: if (sshbuf_len(stderr_buffer) > 0) {
1.230 djm 1439: len = atomicio(vwrite, fileno(stderr),
1.315 markus 1440: (u_char *)sshbuf_ptr(stderr_buffer),
1441: sshbuf_len(stderr_buffer));
1442: if (len < 0 || (u_int)len != sshbuf_len(stderr_buffer))
1.11 markus 1443: error("Write failed flushing stderr buffer.");
1.315 markus 1444: else if ((r = sshbuf_consume(stderr_buffer, len)) != 0)
1.354 djm 1445: fatal_fr(r, "sshbuf_consume");
1.11 markus 1446: }
1447:
1448: /* Clear and free any buffers. */
1.315 markus 1449: sshbuf_free(stderr_buffer);
1.11 markus 1450:
1451: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1452: total_time = monotime_double() - start_time;
1.320 djm 1453: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.200 markus 1454: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1455: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1456: if (total_time > 0)
1.200 markus 1457: verbose("Bytes per second: sent %.1f, received %.1f",
1458: obytes / total_time, ibytes / total_time);
1.11 markus 1459: /* Return the exit status of the program. */
1460: debug("Exit status %d", exit_status);
1461: return exit_status;
1.15 markus 1462: }
1463:
1464: /*********/
1465:
1.77 itojun 1466: static Channel *
1.303 djm 1467: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1468: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1469: {
1.103 deraadt 1470: Channel *c = NULL;
1.289 markus 1471: struct sshbuf *b = NULL;
1.40 markus 1472: char *listen_address, *originator_address;
1.320 djm 1473: u_int listen_port, originator_port;
1.289 markus 1474: int r;
1.40 markus 1475:
1476: /* Get rest of the packet */
1.320 djm 1477: if ((r = sshpkt_get_cstring(ssh, &listen_address, NULL)) != 0 ||
1478: (r = sshpkt_get_u32(ssh, &listen_port)) != 0 ||
1479: (r = sshpkt_get_cstring(ssh, &originator_address, NULL)) != 0 ||
1480: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1481: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1482: fatal_fr(r, "parse packet");
1.40 markus 1483:
1.354 djm 1484: debug_f("listen %s port %d, originator %s port %d",
1.261 millert 1485: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1486:
1.320 djm 1487: if (listen_port > 0xffff)
1.354 djm 1488: error_f("invalid listen port");
1.320 djm 1489: else if (originator_port > 0xffff)
1.354 djm 1490: error_f("invalid originator port");
1.320 djm 1491: else {
1492: c = channel_connect_by_listen_address(ssh,
1493: listen_address, listen_port, "forwarded-tcpip",
1494: originator_address);
1495: }
1.40 markus 1496:
1.289 markus 1497: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1498: if ((b = sshbuf_new()) == NULL) {
1.354 djm 1499: error_f("alloc reply");
1.289 markus 1500: goto out;
1501: }
1502: /* reconstruct and send to muxclient */
1503: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1504: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1505: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1506: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1507: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1508: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1509: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1510: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1511: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1512: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1513: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.354 djm 1514: error_fr(r, "compose for muxclient");
1.289 markus 1515: goto out;
1516: }
1517: }
1518:
1519: out:
1520: sshbuf_free(b);
1.250 djm 1521: free(originator_address);
1522: free(listen_address);
1.40 markus 1523: return c;
1524: }
1525:
1.103 deraadt 1526: static Channel *
1.303 djm 1527: client_request_forwarded_streamlocal(struct ssh *ssh,
1528: const char *request_type, int rchan)
1.261 millert 1529: {
1530: Channel *c = NULL;
1531: char *listen_path;
1.320 djm 1532: int r;
1.261 millert 1533:
1534: /* Get the remote path. */
1.320 djm 1535: if ((r = sshpkt_get_cstring(ssh, &listen_path, NULL)) != 0 ||
1536: (r = sshpkt_get_string(ssh, NULL, NULL)) != 0 || /* reserved */
1537: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1538: fatal_fr(r, "parse packet");
1.261 millert 1539:
1.354 djm 1540: debug_f("request: %s", listen_path);
1.261 millert 1541:
1.303 djm 1542: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1543: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1544: free(listen_path);
1545: return c;
1546: }
1547:
1548: static Channel *
1.303 djm 1549: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1550: {
1551: Channel *c = NULL;
1552: char *originator;
1.321 djm 1553: u_int originator_port;
1.320 djm 1554: int r, sock;
1.40 markus 1555:
1556: if (!options.forward_x11) {
1557: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1558: error("Warning: this is probably a break-in attempt by a "
1559: "malicious server.");
1.221 djm 1560: return NULL;
1561: }
1.274 djm 1562: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1563: verbose("Rejected X11 connection after ForwardX11Timeout "
1564: "expired");
1.40 markus 1565: return NULL;
1566: }
1.320 djm 1567: if ((r = sshpkt_get_cstring(ssh, &originator, NULL)) != 0 ||
1.321 djm 1568: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1.320 djm 1569: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1570: fatal_fr(r, "parse packet");
1.40 markus 1571: /* XXX check permission */
1.321 djm 1572: /* XXX range check originator port? */
1573: debug("client_request_x11: request from %s %u", originator,
1.47 markus 1574: originator_port);
1.250 djm 1575: free(originator);
1.303 djm 1576: sock = x11_connect_display(ssh);
1.67 markus 1577: if (sock < 0)
1578: return NULL;
1.303 djm 1579: c = channel_new(ssh, "x11",
1.67 markus 1580: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1581: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1582: c->force_drain = 1;
1.40 markus 1583: return c;
1584: }
1585:
1.103 deraadt 1586: static Channel *
1.303 djm 1587: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1588: {
1589: Channel *c = NULL;
1.262 djm 1590: int r, sock;
1.40 markus 1591:
1592: if (!options.forward_agent) {
1593: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1594: error("Warning: this is probably a break-in attempt by a "
1595: "malicious server.");
1.40 markus 1596: return NULL;
1597: }
1.330 djm 1598: if (forward_agent_sock_path == NULL) {
1599: r = ssh_get_authentication_socket(&sock);
1600: } else {
1601: r = ssh_get_authentication_socket_path(forward_agent_sock_path, &sock);
1602: }
1603: if (r != 0) {
1.262 djm 1604: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.354 djm 1605: debug_fr(r, "ssh_get_authentication_socket");
1.67 markus 1606: return NULL;
1.262 djm 1607: }
1.372 djm 1608: if ((r = ssh_agent_bind_hostkey(sock, ssh->kex->initial_hostkey,
1609: ssh->kex->session_id, ssh->kex->initial_sig, 1)) == 0)
1610: debug_f("bound agent to hostkey");
1611: else
1612: debug2_fr(r, "ssh_agent_bind_hostkey");
1613:
1.303 djm 1614: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1615: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1616: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1617: "authentication agent connection", 1);
1.82 markus 1618: c->force_drain = 1;
1.40 markus 1619: return c;
1.180 djm 1620: }
1621:
1.306 djm 1622: char *
1.303 djm 1623: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1.343 djm 1624: int local_tun, int remote_tun, channel_open_fn *cb, void *cbctx)
1.180 djm 1625: {
1626: Channel *c;
1.320 djm 1627: int r, fd;
1.306 djm 1628: char *ifname = NULL;
1.180 djm 1629:
1630: if (tun_mode == SSH_TUNMODE_NO)
1631: return 0;
1632:
1633: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1634:
1635: /* Open local tunnel device */
1.306 djm 1636: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1637: error("Tunnel device open failed.");
1.306 djm 1638: return NULL;
1.180 djm 1639: }
1.306 djm 1640: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1641:
1.303 djm 1642: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1643: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1644: c->datagram = 1;
1.343 djm 1645:
1646: if (cb != NULL)
1647: channel_register_open_confirm(ssh, c->self, cb, cbctx);
1.180 djm 1648:
1.320 djm 1649: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1650: (r = sshpkt_put_cstring(ssh, "tun@openssh.com")) != 0 ||
1651: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1652: (r = sshpkt_put_u32(ssh, c->local_window_max)) != 0 ||
1653: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1654: (r = sshpkt_put_u32(ssh, tun_mode)) != 0 ||
1655: (r = sshpkt_put_u32(ssh, remote_tun)) != 0 ||
1656: (r = sshpkt_send(ssh)) != 0)
1.321 djm 1657: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.180 djm 1658:
1.306 djm 1659: return ifname;
1.40 markus 1660: }
1661:
1.22 markus 1662: /* XXXX move to generic input handler */
1.264 markus 1663: static int
1.297 markus 1664: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1665: {
1666: Channel *c = NULL;
1.320 djm 1667: char *ctype = NULL;
1668: int r;
1669: u_int rchan;
1670: size_t len;
1671: u_int rmaxpack, rwindow;
1672:
1673: if ((r = sshpkt_get_cstring(ssh, &ctype, &len)) != 0 ||
1674: (r = sshpkt_get_u32(ssh, &rchan)) != 0 ||
1675: (r = sshpkt_get_u32(ssh, &rwindow)) != 0 ||
1676: (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0)
1677: goto out;
1.22 markus 1678:
1.24 markus 1679: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1680: ctype, rchan, rwindow, rmaxpack);
1681:
1.40 markus 1682: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1683: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1684: rmaxpack);
1.261 millert 1685: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1686: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1687: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1688: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1689: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1690: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1691: }
1.289 markus 1692: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1693: debug3("proxied to downstream: %s", ctype);
1694: } else if (c != NULL) {
1.22 markus 1695: debug("confirm %s", ctype);
1696: c->remote_id = rchan;
1.304 djm 1697: c->have_remote_id = 1;
1.22 markus 1698: c->remote_window = rwindow;
1699: c->remote_maxpacket = rmaxpack;
1.69 markus 1700: if (c->type != SSH_CHANNEL_CONNECTING) {
1.320 djm 1701: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1702: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1703: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1704: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1705: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1706: (r = sshpkt_send(ssh)) != 0)
1707: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.69 markus 1708: }
1.22 markus 1709: } else {
1710: debug("failure %s", ctype);
1.320 djm 1711: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
1712: (r = sshpkt_put_u32(ssh, rchan)) != 0 ||
1713: (r = sshpkt_put_u32(ssh, SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED)) != 0 ||
1714: (r = sshpkt_put_cstring(ssh, "open failed")) != 0 ||
1715: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1716: (r = sshpkt_send(ssh)) != 0)
1717: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.22 markus 1718: }
1.320 djm 1719: r = 0;
1720: out:
1.250 djm 1721: free(ctype);
1.320 djm 1722: return r;
1.22 markus 1723: }
1.267 djm 1724:
1.264 markus 1725: static int
1.297 markus 1726: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1727: {
1728: Channel *c = NULL;
1.320 djm 1729: char *rtype = NULL;
1730: u_char reply;
1731: u_int id, exitval;
1732: int r, success = 0;
1733:
1734: if ((r = sshpkt_get_u32(ssh, &id)) != 0)
1735: return r;
1736: if (id <= INT_MAX)
1737: c = channel_lookup(ssh, id);
1.297 markus 1738: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1739: return 0;
1.320 djm 1740: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
1741: (r = sshpkt_get_u8(ssh, &reply)) != 0)
1742: goto out;
1.48 markus 1743:
1.320 djm 1744: debug("client_input_channel_req: channel %u rtype %s reply %d",
1.48 markus 1745: id, rtype, reply);
1746:
1.320 djm 1747: if (c == NULL) {
1.197 djm 1748: error("client_input_channel_req: channel %d: "
1749: "unknown channel", id);
1.193 markus 1750: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1.320 djm 1751: if ((r = sshpkt_get_end(ssh)) != 0)
1752: goto out;
1.303 djm 1753: chan_rcvd_eow(ssh, c);
1.48 markus 1754: } else if (strcmp(rtype, "exit-status") == 0) {
1.320 djm 1755: if ((r = sshpkt_get_u32(ssh, &exitval)) != 0)
1756: goto out;
1.217 djm 1757: if (c->ctl_chan != -1) {
1.303 djm 1758: mux_exit_message(ssh, c, exitval);
1.215 djm 1759: success = 1;
1.320 djm 1760: } else if ((int)id == session_ident) {
1.215 djm 1761: /* Record exit value of local session */
1.123 djm 1762: success = 1;
1763: exit_status = exitval;
1.215 djm 1764: } else {
1.218 djm 1765: /* Probably for a mux channel that has already closed */
1.354 djm 1766: debug_f("no sink for exit-status on channel %d",
1767: id);
1.123 djm 1768: }
1.320 djm 1769: if ((r = sshpkt_get_end(ssh)) != 0)
1770: goto out;
1.48 markus 1771: }
1.259 djm 1772: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1773: if (!c->have_remote_id)
1.354 djm 1774: fatal_f("channel %d: no remote_id", c->self);
1.320 djm 1775: if ((r = sshpkt_start(ssh, success ?
1776: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE)) != 0 ||
1777: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1778: (r = sshpkt_send(ssh)) != 0)
1779: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.48 markus 1780: }
1.320 djm 1781: r = 0;
1782: out:
1.250 djm 1783: free(rtype);
1.320 djm 1784: return r;
1.48 markus 1785: }
1.267 djm 1786:
1.269 djm 1787: struct hostkeys_update_ctx {
1788: /* The hostname and (optionally) IP address string for the server */
1789: char *host_str, *ip_str;
1790:
1791: /*
1792: * Keys received from the server and a flag for each indicating
1793: * whether they already exist in known_hosts.
1.351 djm 1794: * keys_match is filled in by hostkeys_find() and later (for new
1.381 djm 1795: * keys) by client_global_hostkeys_prove_confirm().
1.269 djm 1796: */
1797: struct sshkey **keys;
1.351 djm 1798: u_int *keys_match; /* mask of HKF_MATCH_* from hostfile.h */
1799: int *keys_verified; /* flag for new keys verified by server */
1800: size_t nkeys, nnew, nincomplete; /* total, new keys, incomplete match */
1.269 djm 1801:
1802: /*
1803: * Keys that are in known_hosts, but were not present in the update
1804: * from the server (i.e. scheduled to be deleted).
1805: * Filled in by hostkeys_find().
1806: */
1807: struct sshkey **old_keys;
1808: size_t nold;
1.347 djm 1809:
1810: /* Various special cases. */
1.350 djm 1811: int complex_hostspec; /* wildcard or manual pattern-list host name */
1.347 djm 1812: int ca_available; /* saw CA key for this host */
1.352 djm 1813: int old_key_seen; /* saw old key with other name/addr */
1.353 djm 1814: int other_name_seen; /* saw key with other name/addr */
1.269 djm 1815: };
1816:
1817: static void
1818: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1819: {
1820: size_t i;
1821:
1822: if (ctx == NULL)
1823: return;
1824: for (i = 0; i < ctx->nkeys; i++)
1825: sshkey_free(ctx->keys[i]);
1826: free(ctx->keys);
1.351 djm 1827: free(ctx->keys_match);
1828: free(ctx->keys_verified);
1.269 djm 1829: for (i = 0; i < ctx->nold; i++)
1830: sshkey_free(ctx->old_keys[i]);
1831: free(ctx->old_keys);
1832: free(ctx->host_str);
1833: free(ctx->ip_str);
1834: free(ctx);
1835: }
1836:
1.350 djm 1837: /*
1838: * Returns non-zero if a known_hosts hostname list is not of a form that
1839: * can be handled by UpdateHostkeys. These include wildcard hostnames and
1840: * hostnames lists that do not follow the form host[,ip].
1841: */
1842: static int
1843: hostspec_is_complex(const char *hosts)
1844: {
1845: char *cp;
1846:
1847: /* wildcard */
1848: if (strchr(hosts, '*') != NULL || strchr(hosts, '?') != NULL)
1849: return 1;
1850: /* single host/ip = ok */
1851: if ((cp = strchr(hosts, ',')) == NULL)
1852: return 0;
1853: /* more than two entries on the line */
1854: if (strchr(cp + 1, ',') != NULL)
1855: return 1;
1856: /* XXX maybe parse cp+1 and ensure it is an IP? */
1857: return 0;
1858: }
1859:
1.352 djm 1860: /* callback to search for ctx->keys in known_hosts */
1.269 djm 1861: static int
1862: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1863: {
1864: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1865: size_t i;
1866: struct sshkey **tmp;
1867:
1.353 djm 1868: if (l->key == NULL)
1.269 djm 1869: return 0;
1.353 djm 1870: if (l->status != HKF_STATUS_MATCHED) {
1871: /* Record if one of the keys appears on a non-matching line */
1872: for (i = 0; i < ctx->nkeys; i++) {
1873: if (sshkey_equal(l->key, ctx->keys[i])) {
1874: ctx->other_name_seen = 1;
1.354 djm 1875: debug3_f("found %s key under different "
1876: "name/addr at %s:%ld",
1.353 djm 1877: sshkey_ssh_name(ctx->keys[i]),
1878: l->path, l->linenum);
1879: return 0;
1880: }
1881: }
1882: return 0;
1883: }
1884: /* Don't proceed if revocation or CA markers are present */
1885: /* XXX relax this */
1886: if (l->marker != MRK_NONE) {
1.354 djm 1887: debug3_f("hostkeys file %s:%ld has CA/revocation marker",
1888: l->path, l->linenum);
1.353 djm 1889: ctx->complex_hostspec = 1;
1890: return 0;
1891: }
1892:
1.355 djm 1893: /* If CheckHostIP is enabled, then check for mismatched hostname/addr */
1894: if (ctx->ip_str != NULL && strchr(l->hosts, ',') != NULL) {
1895: if ((l->match & HKF_MATCH_HOST) == 0) {
1896: /* Record if address matched a different hostname. */
1897: ctx->other_name_seen = 1;
1898: debug3_f("found address %s against different hostname "
1899: "at %s:%ld", ctx->ip_str, l->path, l->linenum);
1900: return 0;
1901: } else if ((l->match & HKF_MATCH_IP) == 0) {
1902: /* Record if hostname matched a different address. */
1903: ctx->other_name_seen = 1;
1904: debug3_f("found hostname %s against different address "
1905: "at %s:%ld", ctx->host_str, l->path, l->linenum);
1906: }
1.353 djm 1907: }
1.269 djm 1908:
1.350 djm 1909: /*
1910: * UpdateHostkeys is skipped for wildcard host names and hostnames
1911: * that contain more than two entries (ssh never writes these).
1912: */
1913: if (hostspec_is_complex(l->hosts)) {
1.354 djm 1914: debug3_f("hostkeys file %s:%ld complex host specification",
1915: l->path, l->linenum);
1.350 djm 1916: ctx->complex_hostspec = 1;
1.347 djm 1917: return 0;
1918: }
1919:
1.269 djm 1920: /* Mark off keys we've already seen for this host */
1921: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 1922: if (!sshkey_equal(l->key, ctx->keys[i]))
1923: continue;
1.354 djm 1924: debug3_f("found %s key at %s:%ld",
1.351 djm 1925: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1926: ctx->keys_match[i] |= l->match;
1927: return 0;
1.269 djm 1928: }
1929: /* This line contained a key that not offered by the server */
1.354 djm 1930: debug3_f("deprecated %s key at %s:%ld", sshkey_ssh_name(l->key),
1931: l->path, l->linenum);
1.299 deraadt 1932: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1933: sizeof(*ctx->old_keys))) == NULL)
1.354 djm 1934: fatal_f("recallocarray failed nold = %zu", ctx->nold);
1.269 djm 1935: ctx->old_keys = tmp;
1936: ctx->old_keys[ctx->nold++] = l->key;
1937: l->key = NULL;
1938:
1939: return 0;
1940: }
1941:
1.352 djm 1942: /* callback to search for ctx->old_keys in known_hosts under other names */
1943: static int
1944: hostkeys_check_old(struct hostkey_foreach_line *l, void *_ctx)
1945: {
1946: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1947: size_t i;
1948: int hashed;
1949:
1950: /* only care about lines that *don't* match the active host spec */
1951: if (l->status == HKF_STATUS_MATCHED || l->key == NULL)
1952: return 0;
1953:
1954: hashed = l->match & (HKF_MATCH_HOST_HASHED|HKF_MATCH_IP_HASHED);
1955: for (i = 0; i < ctx->nold; i++) {
1956: if (!sshkey_equal(l->key, ctx->old_keys[i]))
1957: continue;
1.354 djm 1958: debug3_f("found deprecated %s key at %s:%ld as %s",
1.364 djm 1959: sshkey_ssh_name(ctx->old_keys[i]), l->path, l->linenum,
1.352 djm 1960: hashed ? "[HASHED]" : l->hosts);
1961: ctx->old_key_seen = 1;
1962: break;
1963: }
1964: return 0;
1965: }
1966:
1967: /*
1968: * Check known_hosts files for deprecated keys under other names. Returns 0
1969: * on success or -1 on failure. Updates ctx->old_key_seen if deprecated keys
1970: * exist under names other than the active hostname/IP.
1971: */
1972: static int
1973: check_old_keys_othernames(struct hostkeys_update_ctx *ctx)
1974: {
1975: size_t i;
1976: int r;
1977:
1.354 djm 1978: debug2_f("checking for %zu deprecated keys", ctx->nold);
1.352 djm 1979: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 1980: debug3_f("searching %s for %s / %s",
1.352 djm 1981: options.user_hostfiles[i], ctx->host_str,
1982: ctx->ip_str ? ctx->ip_str : "(none)");
1983: if ((r = hostkeys_foreach(options.user_hostfiles[i],
1984: hostkeys_check_old, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 1985: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.352 djm 1986: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 1987: debug_f("hostkeys file %s does not exist",
1988: options.user_hostfiles[i]);
1.352 djm 1989: continue;
1990: }
1.354 djm 1991: error_fr(r, "hostkeys_foreach failed for %s",
1992: options.user_hostfiles[i]);
1.352 djm 1993: return -1;
1994: }
1995: }
1996: return 0;
1997: }
1998:
1.269 djm 1999: static void
1.337 djm 2000: hostkey_change_preamble(LogLevel loglevel)
1.269 djm 2001: {
1.336 djm 2002: do_log2(loglevel, "The server has updated its host keys.");
2003: do_log2(loglevel, "These changes were verified by the server's "
2004: "existing trusted key.");
2005: }
2006:
2007: static void
2008: update_known_hosts(struct hostkeys_update_ctx *ctx)
2009: {
2010: int r, was_raw = 0, first = 1;
2011: int asking = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK;
2012: LogLevel loglevel = asking ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1.269 djm 2013: char *fp, *response;
2014: size_t i;
1.333 djm 2015: struct stat sb;
1.269 djm 2016:
2017: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2018: if (!ctx->keys_verified[i])
1.269 djm 2019: continue;
2020: if ((fp = sshkey_fingerprint(ctx->keys[i],
2021: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2022: fatal_f("sshkey_fingerprint failed");
1.336 djm 2023: if (first && asking)
1.337 djm 2024: hostkey_change_preamble(loglevel);
1.269 djm 2025: do_log2(loglevel, "Learned new hostkey: %s %s",
2026: sshkey_type(ctx->keys[i]), fp);
1.336 djm 2027: first = 0;
1.269 djm 2028: free(fp);
2029: }
2030: for (i = 0; i < ctx->nold; i++) {
2031: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2032: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2033: fatal_f("sshkey_fingerprint failed");
1.336 djm 2034: if (first && asking)
1.337 djm 2035: hostkey_change_preamble(loglevel);
1.269 djm 2036: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2037: sshkey_type(ctx->old_keys[i]), fp);
1.336 djm 2038: first = 0;
1.269 djm 2039: free(fp);
2040: }
2041: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2042: if (get_saved_tio() != NULL) {
2043: leave_raw_mode(1);
2044: was_raw = 1;
2045: }
1.269 djm 2046: response = NULL;
2047: for (i = 0; !quit_pending && i < 3; i++) {
2048: free(response);
2049: response = read_passphrase("Accept updated hostkeys? "
2050: "(yes/no): ", RP_ECHO);
2051: if (strcasecmp(response, "yes") == 0)
2052: break;
2053: else if (quit_pending || response == NULL ||
2054: strcasecmp(response, "no") == 0) {
2055: options.update_hostkeys = 0;
2056: break;
2057: } else {
2058: do_log2(loglevel, "Please enter "
2059: "\"yes\" or \"no\"");
2060: }
2061: }
2062: if (quit_pending || i >= 3 || response == NULL)
2063: options.update_hostkeys = 0;
2064: free(response);
1.271 djm 2065: if (was_raw)
2066: enter_raw_mode(1);
1.269 djm 2067: }
1.333 djm 2068: if (options.update_hostkeys == 0)
2069: return;
1.269 djm 2070: /*
2071: * Now that all the keys are verified, we can go ahead and replace
2072: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2073: * cancel the operation).
2074: */
1.333 djm 2075: for (i = 0; i < options.num_user_hostfiles; i++) {
2076: /*
2077: * NB. keys are only added to hostfiles[0], for the rest we
2078: * just delete the hostname entries.
2079: */
2080: if (stat(options.user_hostfiles[i], &sb) != 0) {
2081: if (errno == ENOENT) {
1.354 djm 2082: debug_f("known hosts file %s does not "
2083: "exist", options.user_hostfiles[i]);
1.333 djm 2084: } else {
1.354 djm 2085: error_f("known hosts file %s "
2086: "inaccessible: %s",
2087: options.user_hostfiles[i], strerror(errno));
1.333 djm 2088: }
2089: continue;
2090: }
2091: if ((r = hostfile_replace_entries(options.user_hostfiles[i],
2092: ctx->host_str, ctx->ip_str,
2093: i == 0 ? ctx->keys : NULL, i == 0 ? ctx->nkeys : 0,
2094: options.hash_known_hosts, 0,
2095: options.fingerprint_hash)) != 0) {
1.354 djm 2096: error_fr(r, "hostfile_replace_entries failed for %s",
2097: options.user_hostfiles[i]);
1.333 djm 2098: }
2099: }
1.269 djm 2100: }
2101:
2102: static void
1.381 djm 2103: client_global_hostkeys_prove_confirm(struct ssh *ssh, int type,
1.303 djm 2104: u_int32_t seq, void *_ctx)
1.269 djm 2105: {
2106: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2107: size_t i, ndone;
2108: struct sshbuf *signdata;
1.375 djm 2109: int r, plaintype;
1.269 djm 2110: const u_char *sig;
1.375 djm 2111: const char *rsa_kexalg = NULL;
2112: char *alg = NULL;
1.269 djm 2113: size_t siglen;
2114:
2115: if (ctx->nnew == 0)
1.354 djm 2116: fatal_f("ctx->nnew == 0"); /* sanity */
1.269 djm 2117: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2118: error("Server failed to confirm ownership of "
2119: "private host keys");
2120: hostkeys_update_ctx_free(ctx);
2121: return;
2122: }
1.375 djm 2123: if (sshkey_type_plain(sshkey_type_from_name(
2124: ssh->kex->hostkey_alg)) == KEY_RSA)
2125: rsa_kexalg = ssh->kex->hostkey_alg;
1.269 djm 2126: if ((signdata = sshbuf_new()) == NULL)
1.354 djm 2127: fatal_f("sshbuf_new failed");
1.269 djm 2128: /*
2129: * Expect a signature for each of the ctx->nnew private keys we
2130: * haven't seen before. They will be in the same order as the
1.351 djm 2131: * ctx->keys where the corresponding ctx->keys_match[i] == 0.
1.269 djm 2132: */
2133: for (ndone = i = 0; i < ctx->nkeys; i++) {
1.351 djm 2134: if (ctx->keys_match[i])
1.269 djm 2135: continue;
1.375 djm 2136: plaintype = sshkey_type_plain(ctx->keys[i]->type);
1.269 djm 2137: /* Prepare data to be signed: session ID, unique string, key */
2138: sshbuf_reset(signdata);
1.270 djm 2139: if ( (r = sshbuf_put_cstring(signdata,
2140: "hostkeys-prove-00@openssh.com")) != 0 ||
1.358 djm 2141: (r = sshbuf_put_stringb(signdata,
2142: ssh->kex->session_id)) != 0 ||
1.269 djm 2143: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1.354 djm 2144: fatal_fr(r, "compose signdata");
1.269 djm 2145: /* Extract and verify signature */
2146: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1.354 djm 2147: error_fr(r, "parse sig");
1.269 djm 2148: goto out;
2149: }
1.375 djm 2150: if ((r = sshkey_get_sigtype(sig, siglen, &alg)) != 0) {
2151: error_fr(r, "server gave unintelligible signature "
2152: "for %s key %zu", sshkey_type(ctx->keys[i]), i);
2153: goto out;
2154: }
1.309 djm 2155: /*
1.375 djm 2156: * Special case for RSA keys: if a RSA hostkey was negotiated,
2157: * then use its signature type for verification of RSA hostkey
2158: * proofs. Otherwise, accept only RSA-SHA256/512 signatures.
1.309 djm 2159: */
1.375 djm 2160: if (plaintype == KEY_RSA && rsa_kexalg == NULL &&
2161: match_pattern_list(alg, HOSTKEY_PROOF_RSA_ALGS, 0) != 1) {
2162: debug_f("server used untrusted RSA signature algorithm "
2163: "%s for key %zu, disregarding", alg, i);
2164: free(alg);
2165: /* zap the key from the list */
2166: sshkey_free(ctx->keys[i]);
2167: ctx->keys[i] = NULL;
2168: ndone++;
2169: continue;
2170: }
2171: debug3_f("verify %s key %zu using sigalg %s",
2172: sshkey_type(ctx->keys[i]), i, alg);
2173: free(alg);
1.269 djm 2174: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 2175: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.375 djm 2176: plaintype == KEY_RSA ? rsa_kexalg : NULL, 0, NULL)) != 0) {
1.361 djm 2177: error_fr(r, "server gave bad signature for %s key %zu",
1.354 djm 2178: sshkey_type(ctx->keys[i]), i);
1.269 djm 2179: goto out;
2180: }
2181: /* Key is good. Mark it as 'seen' */
1.351 djm 2182: ctx->keys_verified[i] = 1;
1.269 djm 2183: ndone++;
2184: }
1.354 djm 2185: /* Shouldn't happen */
1.269 djm 2186: if (ndone != ctx->nnew)
1.354 djm 2187: fatal_f("ndone != ctx->nnew (%zu / %zu)", ndone, ctx->nnew);
1.320 djm 2188: if ((r = sshpkt_get_end(ssh)) != 0) {
1.354 djm 2189: error_f("protocol error");
1.320 djm 2190: goto out;
2191: }
1.269 djm 2192:
2193: /* Make the edits to known_hosts */
2194: update_known_hosts(ctx);
2195: out:
2196: hostkeys_update_ctx_free(ctx);
2197: }
2198:
1.267 djm 2199: /*
1.291 djm 2200: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
2201: * Made slightly less trivial by the multiple RSA signature algorithm names.
2202: */
2203: static int
2204: key_accepted_by_hostkeyalgs(const struct sshkey *key)
2205: {
2206: const char *ktype = sshkey_ssh_name(key);
1.331 dtucker 2207: const char *hostkeyalgs = options.hostkeyalgorithms;
1.291 djm 2208:
2209: if (key == NULL || key->type == KEY_UNSPEC)
2210: return 0;
2211: if (key->type == KEY_RSA &&
2212: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
2213: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
2214: return 1;
2215: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
2216: }
2217:
2218: /*
1.270 djm 2219: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2220: * the server's hostkeys. The keys are checked against the user's
2221: * HostkeyAlgorithms preference before they are accepted.
2222: */
2223: static int
1.321 djm 2224: client_input_hostkeys(struct ssh *ssh)
1.267 djm 2225: {
2226: const u_char *blob = NULL;
1.269 djm 2227: size_t i, len = 0;
1.267 djm 2228: struct sshbuf *buf = NULL;
1.269 djm 2229: struct sshkey *key = NULL, **tmp;
2230: int r;
2231: char *fp;
1.267 djm 2232: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2233: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2234: struct hostkeys_update_ctx *ctx = NULL;
1.351 djm 2235: u_int want;
1.267 djm 2236:
2237: if (hostkeys_seen)
1.354 djm 2238: fatal_f("server already sent hostkeys");
1.269 djm 2239: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2240: options.batch_mode)
2241: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2242: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2243: return 1;
1.272 djm 2244:
2245: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2246: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2247: sshkey_free(key);
2248: key = NULL;
1.269 djm 2249: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
1.354 djm 2250: error_fr(r, "parse key");
1.269 djm 2251: goto out;
2252: }
1.270 djm 2253: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
1.354 djm 2254: do_log2_fr(r, r == SSH_ERR_KEY_TYPE_UNKNOWN ?
1.335 djm 2255: SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR,
1.354 djm 2256: "convert key");
1.335 djm 2257: continue;
1.270 djm 2258: }
1.267 djm 2259: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2260: SSH_FP_DEFAULT);
1.354 djm 2261: debug3_f("received %s key %s", sshkey_type(key), fp);
1.267 djm 2262: free(fp);
1.275 markus 2263:
1.291 djm 2264: if (!key_accepted_by_hostkeyalgs(key)) {
1.354 djm 2265: debug3_f("%s key not permitted by "
2266: "HostkeyAlgorithms", sshkey_ssh_name(key));
1.267 djm 2267: continue;
2268: }
1.269 djm 2269: /* Skip certs */
2270: if (sshkey_is_cert(key)) {
1.354 djm 2271: debug3_f("%s key is a certificate; skipping",
2272: sshkey_ssh_name(key));
1.269 djm 2273: continue;
2274: }
2275: /* Ensure keys are unique */
2276: for (i = 0; i < ctx->nkeys; i++) {
2277: if (sshkey_equal(key, ctx->keys[i])) {
1.354 djm 2278: error_f("received duplicated %s host key",
2279: sshkey_ssh_name(key));
1.269 djm 2280: goto out;
2281: }
2282: }
2283: /* Key is good, record it */
1.299 deraadt 2284: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2285: sizeof(*ctx->keys))) == NULL)
1.354 djm 2286: fatal_f("recallocarray failed nkeys = %zu",
2287: ctx->nkeys);
1.269 djm 2288: ctx->keys = tmp;
2289: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2290: key = NULL;
2291: }
2292:
1.269 djm 2293: if (ctx->nkeys == 0) {
1.354 djm 2294: debug_f("server sent no hostkeys");
1.267 djm 2295: goto out;
2296: }
1.270 djm 2297:
1.351 djm 2298: if ((ctx->keys_match = calloc(ctx->nkeys,
2299: sizeof(*ctx->keys_match))) == NULL ||
2300: (ctx->keys_verified = calloc(ctx->nkeys,
2301: sizeof(*ctx->keys_verified))) == NULL)
1.354 djm 2302: fatal_f("calloc failed");
1.267 djm 2303:
1.268 djm 2304: get_hostfile_hostname_ipaddr(host,
2305: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2306: options.port, &ctx->host_str,
2307: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2308:
1.269 djm 2309: /* Find which keys we already know about. */
1.333 djm 2310: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2311: debug_f("searching %s for %s / %s",
1.339 dtucker 2312: options.user_hostfiles[i], ctx->host_str,
1.340 dtucker 2313: ctx->ip_str ? ctx->ip_str : "(none)");
1.333 djm 2314: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2315: hostkeys_find, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2316: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.333 djm 2317: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2318: debug_f("hostkeys file %s does not exist",
2319: options.user_hostfiles[i]);
1.333 djm 2320: continue;
2321: }
1.354 djm 2322: error_fr(r, "hostkeys_foreach failed for %s",
2323: options.user_hostfiles[i]);
1.333 djm 2324: goto out;
2325: }
1.267 djm 2326: }
2327:
1.269 djm 2328: /* Figure out if we have any new keys to add */
1.351 djm 2329: ctx->nnew = ctx->nincomplete = 0;
2330: want = HKF_MATCH_HOST | ( options.check_host_ip ? HKF_MATCH_IP : 0);
1.269 djm 2331: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2332: if (ctx->keys_match[i] == 0)
1.269 djm 2333: ctx->nnew++;
1.351 djm 2334: if ((ctx->keys_match[i] & want) != want)
2335: ctx->nincomplete++;
1.269 djm 2336: }
2337:
1.354 djm 2338: debug3_f("%zu server keys: %zu new, %zu retained, "
2339: "%zu incomplete match. %zu to remove", ctx->nkeys, ctx->nnew,
2340: ctx->nkeys - ctx->nnew - ctx->nincomplete,
1.351 djm 2341: ctx->nincomplete, ctx->nold);
1.269 djm 2342:
1.353 djm 2343: if (ctx->nnew == 0 && ctx->nold == 0) {
1.354 djm 2344: debug_f("no new or deprecated keys from server");
1.353 djm 2345: goto out;
2346: }
2347:
2348: /* Various reasons why we cannot proceed with the update */
2349: if (ctx->complex_hostspec) {
1.354 djm 2350: debug_f("CA/revocation marker, manual host list or wildcard "
2351: "host pattern found, skipping UserKnownHostsFile update");
1.353 djm 2352: goto out;
2353: }
2354: if (ctx->other_name_seen) {
1.354 djm 2355: debug_f("host key found matching a different name/address, "
2356: "skipping UserKnownHostsFile update");
1.347 djm 2357: goto out;
1.352 djm 2358: }
2359: /*
2360: * If removing keys, check whether they appear under different
2361: * names/addresses and refuse to proceed if they do. This avoids
2362: * cases such as hosts with multiple names becoming inconsistent
2363: * with regards to CheckHostIP entries.
2364: * XXX UpdateHostkeys=force to override this (and other) checks?
2365: */
2366: if (ctx->nold != 0) {
2367: if (check_old_keys_othernames(ctx) != 0)
2368: goto out; /* error already logged */
2369: if (ctx->old_key_seen) {
1.354 djm 2370: debug_f("key(s) for %s%s%s exist under other names; "
2371: "skipping UserKnownHostsFile update",
1.352 djm 2372: ctx->host_str, ctx->ip_str == NULL ? "" : ",",
2373: ctx->ip_str == NULL ? "" : ctx->ip_str);
2374: goto out;
2375: }
2376: }
2377:
1.353 djm 2378: if (ctx->nnew == 0) {
1.351 djm 2379: /*
2380: * We have some keys to remove or fix matching for.
2381: * We can proceed to do this without requiring a fresh proof
2382: * from the server.
2383: */
1.269 djm 2384: update_known_hosts(ctx);
1.353 djm 2385: goto out;
2386: }
2387: /*
2388: * We have received previously-unseen keys from the server.
2389: * Ask the server to confirm ownership of the private halves.
2390: */
1.354 djm 2391: debug3_f("asking server to prove ownership for %zu keys", ctx->nnew);
1.353 djm 2392: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2393: (r = sshpkt_put_cstring(ssh,
2394: "hostkeys-prove-00@openssh.com")) != 0 ||
2395: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
1.354 djm 2396: fatal_fr(r, "prepare hostkeys-prove");
1.353 djm 2397: if ((buf = sshbuf_new()) == NULL)
1.354 djm 2398: fatal_f("sshbuf_new");
1.353 djm 2399: for (i = 0; i < ctx->nkeys; i++) {
2400: if (ctx->keys_match[i])
2401: continue;
2402: sshbuf_reset(buf);
2403: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0 ||
1.354 djm 2404: (r = sshpkt_put_stringb(ssh, buf)) != 0)
2405: fatal_fr(r, "assemble hostkeys-prove");
1.269 djm 2406: }
1.353 djm 2407: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2408: fatal_fr(r, "send hostkeys-prove");
1.353 djm 2409: client_register_global_confirm(
1.381 djm 2410: client_global_hostkeys_prove_confirm, ctx);
1.353 djm 2411: ctx = NULL; /* will be freed in callback */
1.269 djm 2412:
1.267 djm 2413: /* Success */
2414: out:
1.269 djm 2415: hostkeys_update_ctx_free(ctx);
1.267 djm 2416: sshkey_free(key);
2417: sshbuf_free(buf);
1.269 djm 2418: /*
2419: * NB. Return success for all cases. The server doesn't need to know
2420: * what the client does with its hosts file.
2421: */
2422: return 1;
1.267 djm 2423: }
2424:
1.264 markus 2425: static int
1.297 markus 2426: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2427: {
2428: char *rtype;
1.320 djm 2429: u_char want_reply;
2430: int r, success = 0;
1.95 markus 2431:
1.320 djm 2432: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
2433: (r = sshpkt_get_u8(ssh, &want_reply)) != 0)
2434: goto out;
1.117 markus 2435: debug("client_input_global_request: rtype %s want_reply %d",
2436: rtype, want_reply);
1.270 djm 2437: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.321 djm 2438: success = client_input_hostkeys(ssh);
1.95 markus 2439: if (want_reply) {
1.320 djm 2440: if ((r = sshpkt_start(ssh, success ? SSH2_MSG_REQUEST_SUCCESS :
2441: SSH2_MSG_REQUEST_FAILURE)) != 0 ||
2442: (r = sshpkt_send(ssh)) != 0 ||
2443: (r = ssh_packet_write_wait(ssh)) != 0)
2444: goto out;
1.95 markus 2445: }
1.320 djm 2446: r = 0;
2447: out:
1.250 djm 2448: free(rtype);
1.320 djm 2449: return r;
1.95 markus 2450: }
1.22 markus 2451:
1.354 djm 2452: static void
2453: client_send_env(struct ssh *ssh, int id, const char *name, const char *val)
2454: {
2455: int r;
2456:
2457: debug("channel %d: setting env %s = \"%s\"", id, name, val);
2458: channel_request_start(ssh, id, "env", 0);
2459: if ((r = sshpkt_put_cstring(ssh, name)) != 0 ||
2460: (r = sshpkt_put_cstring(ssh, val)) != 0 ||
2461: (r = sshpkt_send(ssh)) != 0)
2462: fatal_fr(r, "send setenv");
2463: }
2464:
1.123 djm 2465: void
1.303 djm 2466: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.315 markus 2467: const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd,
2468: char **env)
1.123 djm 2469: {
1.380 djm 2470: size_t i, j, len;
2471: int matched, r;
1.313 djm 2472: char *name, *val;
1.132 djm 2473: Channel *c = NULL;
1.123 djm 2474:
1.354 djm 2475: debug2_f("id %d", id);
1.123 djm 2476:
1.303 djm 2477: if ((c = channel_lookup(ssh, id)) == NULL)
1.354 djm 2478: fatal_f("channel %d: unknown channel", id);
1.224 djm 2479:
1.320 djm 2480: ssh_packet_set_interactive(ssh, want_tty,
1.224 djm 2481: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2482:
1.123 djm 2483: if (want_tty) {
2484: struct winsize ws;
2485:
2486: /* Store window size in the packet. */
1.326 deraadt 2487: if (ioctl(in_fd, TIOCGWINSZ, &ws) == -1)
1.123 djm 2488: memset(&ws, 0, sizeof(ws));
2489:
1.303 djm 2490: channel_request_start(ssh, id, "pty-req", 1);
2491: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.320 djm 2492: if ((r = sshpkt_put_cstring(ssh, term != NULL ? term : ""))
2493: != 0 ||
2494: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
2495: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
2496: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
2497: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0)
1.354 djm 2498: fatal_fr(r, "build pty-req");
1.194 djm 2499: if (tiop == NULL)
2500: tiop = get_saved_tio();
1.316 markus 2501: ssh_tty_make_modes(ssh, -1, tiop);
1.320 djm 2502: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2503: fatal_fr(r, "send pty-req");
1.123 djm 2504: /* XXX wait for reply */
1.132 djm 2505: c->client_tty = 1;
1.123 djm 2506: }
2507:
2508: /* Transfer any environment variables from client to server */
1.126 djm 2509: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2510: debug("Sending environment.");
1.126 djm 2511: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2512: /* Split */
1.126 djm 2513: name = xstrdup(env[i]);
1.123 djm 2514: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2515: free(name);
1.123 djm 2516: continue;
2517: }
2518: *val++ = '\0';
2519:
2520: matched = 0;
2521: for (j = 0; j < options.num_send_env; j++) {
2522: if (match_pattern(name, options.send_env[j])) {
2523: matched = 1;
2524: break;
2525: }
2526: }
2527: if (!matched) {
2528: debug3("Ignored env %s", name);
1.250 djm 2529: free(name);
1.123 djm 2530: continue;
2531: }
1.354 djm 2532: client_send_env(ssh, id, name, val);
1.250 djm 2533: free(name);
1.123 djm 2534: }
1.313 djm 2535: }
2536: for (i = 0; i < options.num_setenv; i++) {
2537: /* Split */
2538: name = xstrdup(options.setenv[i]);
2539: if ((val = strchr(name, '=')) == NULL) {
2540: free(name);
2541: continue;
2542: }
2543: *val++ = '\0';
1.354 djm 2544: client_send_env(ssh, id, name, val);
1.313 djm 2545: free(name);
1.123 djm 2546: }
2547:
1.315 markus 2548: len = sshbuf_len(cmd);
1.123 djm 2549: if (len > 0) {
2550: if (len > 900)
2551: len = 900;
2552: if (want_subsystem) {
1.190 djm 2553: debug("Sending subsystem: %.*s",
1.380 djm 2554: (int)len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2555: channel_request_start(ssh, id, "subsystem", 1);
2556: client_expect_confirm(ssh, id, "subsystem",
2557: CONFIRM_CLOSE);
1.123 djm 2558: } else {
1.190 djm 2559: debug("Sending command: %.*s",
1.380 djm 2560: (int)len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2561: channel_request_start(ssh, id, "exec", 1);
2562: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2563: }
1.320 djm 2564: if ((r = sshpkt_put_stringb(ssh, cmd)) != 0 ||
2565: (r = sshpkt_send(ssh)) != 0)
1.354 djm 2566: fatal_fr(r, "send command");
1.123 djm 2567: } else {
1.303 djm 2568: channel_request_start(ssh, id, "shell", 1);
2569: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.354 djm 2570: if ((r = sshpkt_send(ssh)) != 0)
2571: fatal_fr(r, "send shell");
1.123 djm 2572: }
2573: }
2574:
1.77 itojun 2575: static void
1.321 djm 2576: client_init_dispatch(struct ssh *ssh)
1.16 markus 2577: {
1.321 djm 2578: ssh_dispatch_init(ssh, &dispatch_protocol_error);
1.100 markus 2579:
1.321 djm 2580: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2581: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2582: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2583: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2584: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2585: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2586: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2587: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2588: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2589: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2590: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2591: ssh_dispatch_set(ssh, SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2592:
2593: /* rekeying */
1.321 djm 2594: ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2595:
2596: /* global request reply messages */
1.321 djm 2597: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2598: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2599: }
2600:
2601: void
2602: client_stop_mux(void)
2603: {
2604: if (options.control_path != NULL && muxserver_sock != -1)
2605: unlink(options.control_path);
2606: /*
1.247 dtucker 2607: * If we are in persist mode, or don't have a shell, signal that we
2608: * should close when all active channels are closed.
1.232 djm 2609: */
1.366 djm 2610: if (options.control_persist || options.session_type == SESSION_TYPE_NONE) {
1.232 djm 2611: session_closed = 1;
1.235 djm 2612: setproctitle("[stopped mux]");
2613: }
1.113 markus 2614: }
2615:
2616: /* client specific fatal cleanup */
2617: void
1.114 markus 2618: cleanup_exit(int i)
1.113 markus 2619: {
1.233 djm 2620: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.192 djm 2621: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2622: unlink(options.control_path);
1.223 djm 2623: ssh_kill_proxy_command();
1.114 markus 2624: _exit(i);
1.1 deraadt 2625: }