Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.375
1.375 ! djm 1: /* $OpenBSD: clientloop.c,v 1.374 2022/01/06 21:48:38 djm Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.189 djm 68: #include <sys/queue.h>
1.150 stevesk 69:
1.155 stevesk 70: #include <ctype.h>
1.168 stevesk 71: #include <errno.h>
1.151 stevesk 72: #include <paths.h>
1.374 djm 73: #include <poll.h>
1.153 stevesk 74: #include <signal.h>
1.174 stevesk 75: #include <stdio.h>
1.173 stevesk 76: #include <stdlib.h>
1.170 stevesk 77: #include <string.h>
1.328 deraadt 78: #include <stdarg.h>
1.150 stevesk 79: #include <termios.h>
1.175 deraadt 80: #include <pwd.h>
1.169 stevesk 81: #include <unistd.h>
1.266 deraadt 82: #include <limits.h>
1.1 deraadt 83:
1.175 deraadt 84: #include "xmalloc.h"
1.45 markus 85: #include "ssh.h"
86: #include "ssh2.h"
1.1 deraadt 87: #include "packet.h"
1.315 markus 88: #include "sshbuf.h"
1.15 markus 89: #include "compat.h"
1.74 markus 90: #include "channels.h"
1.15 markus 91: #include "dispatch.h"
1.317 markus 92: #include "sshkey.h"
1.175 deraadt 93: #include "cipher.h"
1.54 markus 94: #include "kex.h"
1.275 markus 95: #include "myproposal.h"
1.45 markus 96: #include "log.h"
1.261 millert 97: #include "misc.h"
1.45 markus 98: #include "readconf.h"
99: #include "clientloop.h"
1.147 djm 100: #include "sshconnect.h"
1.40 markus 101: #include "authfd.h"
1.45 markus 102: #include "atomicio.h"
1.118 deraadt 103: #include "sshpty.h"
1.123 djm 104: #include "match.h"
105: #include "msg.h"
1.262 djm 106: #include "ssherr.h"
1.267 djm 107: #include "hostfile.h"
1.319 djm 108:
1.375 ! djm 109: /* Permitted RSA signature algorithms for UpdateHostkeys proofs */
! 110: #define HOSTKEY_PROOF_RSA_ALGS "rsa-sha2-512,rsa-sha2-256"
! 111:
1.39 markus 112: /* import options */
113: extern Options options;
1.1 deraadt 114:
1.123 djm 115: /* Control socket */
1.217 djm 116: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 117:
1.13 markus 118: /*
119: * Name of the host we are connecting to. This is the name given on the
1.324 jmc 120: * command line, or the Hostname specified for the user-supplied name in a
1.13 markus 121: * configuration file.
122: */
1.1 deraadt 123: extern char *host;
124:
1.13 markus 125: /*
1.330 djm 126: * If this field is not NULL, the ForwardAgent socket is this path and different
127: * instead of SSH_AUTH_SOCK.
128: */
129: extern char *forward_agent_sock_path;
130:
131: /*
1.13 markus 132: * Flag to indicate that we have received a window change signal which has
133: * not yet been processed. This will cause a message indicating the new
134: * window size to be sent to the server a little later. This is volatile
135: * because this is updated in a signal handler.
136: */
1.88 markus 137: static volatile sig_atomic_t received_window_change_signal = 0;
138: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 139:
1.222 djm 140: /* Time when backgrounded control master using ControlPersist should exit */
141: static time_t control_persist_exit_time = 0;
142:
1.1 deraadt 143: /* Common data for the client loop code. */
1.217 djm 144: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.11 markus 145: static int last_was_cr; /* Last character was a newline. */
1.197 djm 146: static int exit_status; /* Used to store the command exit status. */
1.315 markus 147: static struct sshbuf *stderr_buffer; /* Used for final exit message. */
1.11 markus 148: static int connection_in; /* Connection to server (input). */
149: static int connection_out; /* Connection to server (output). */
1.56 markus 150: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 151: static int session_closed; /* In SSH2: login session closed. */
1.274 djm 152: static u_int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.345 dtucker 153: static time_t server_alive_time; /* Time to do server_alive_check */
1.1 deraadt 154:
1.321 djm 155: static void client_init_dispatch(struct ssh *ssh);
1.16 markus 156: int session_ident = -1;
157:
1.195 djm 158: /* Track escape per proto2 channel */
159: struct escape_filter_ctx {
160: int escape_pending;
161: int escape_char;
162: };
163:
164: /* Context for channel confirmation replies */
1.190 djm 165: struct channel_reply_ctx {
166: const char *request_type;
1.234 djm 167: int id;
168: enum confirm_action action;
1.190 djm 169: };
170:
1.196 djm 171: /* Global request success/failure callbacks */
1.303 djm 172: /* XXX move to struct ssh? */
1.196 djm 173: struct global_confirm {
174: TAILQ_ENTRY(global_confirm) entry;
175: global_confirm_cb *cb;
176: void *ctx;
177: int ref_count;
178: };
179: TAILQ_HEAD(global_confirms, global_confirm);
180: static struct global_confirms global_confirms =
181: TAILQ_HEAD_INITIALIZER(global_confirms);
182:
1.315 markus 183: void ssh_process_session2_setup(int, int, int, struct sshbuf *);
1.123 djm 184:
1.13 markus 185: /*
186: * Signal handler for the window change signal (SIGWINCH). This just sets a
187: * flag indicating that the window has changed.
188: */
1.157 deraadt 189: /*ARGSUSED */
1.77 itojun 190: static void
1.11 markus 191: window_change_handler(int sig)
1.1 deraadt 192: {
1.11 markus 193: received_window_change_signal = 1;
1.1 deraadt 194: }
195:
1.13 markus 196: /*
197: * Signal handler for signals that cause the program to terminate. These
198: * signals must be trapped to restore terminal modes.
199: */
1.157 deraadt 200: /*ARGSUSED */
1.77 itojun 201: static void
1.11 markus 202: signal_handler(int sig)
1.1 deraadt 203: {
1.75 markus 204: received_signal = sig;
205: quit_pending = 1;
1.1 deraadt 206: }
207:
1.13 markus 208: /*
1.222 djm 209: * Sets control_persist_exit_time to the absolute time when the
210: * backgrounded control master should exit due to expiry of the
211: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
212: * control master process, or if there is no ControlPersist timeout.
213: */
214: static void
1.303 djm 215: set_control_persist_exit_time(struct ssh *ssh)
1.222 djm 216: {
217: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 218: || options.control_persist_timeout == 0) {
1.222 djm 219: /* not using a ControlPersist timeout */
220: control_persist_exit_time = 0;
1.303 djm 221: } else if (channel_still_open(ssh)) {
1.222 djm 222: /* some client connections are still open */
223: if (control_persist_exit_time > 0)
1.354 djm 224: debug2_f("cancel scheduled exit");
1.222 djm 225: control_persist_exit_time = 0;
226: } else if (control_persist_exit_time <= 0) {
227: /* a client connection has recently closed */
1.251 dtucker 228: control_persist_exit_time = monotime() +
1.222 djm 229: (time_t)options.control_persist_timeout;
1.354 djm 230: debug2_f("schedule exit in %d seconds",
1.222 djm 231: options.control_persist_timeout);
232: }
233: /* else we are already counting down to the timeout */
234: }
235:
1.238 dtucker 236: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
237: static int
238: client_x11_display_valid(const char *display)
239: {
240: size_t i, dlen;
241:
1.279 djm 242: if (display == NULL)
243: return 0;
244:
1.238 dtucker 245: dlen = strlen(display);
246: for (i = 0; i < dlen; i++) {
1.256 deraadt 247: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 248: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
249: debug("Invalid character '%c' in DISPLAY", display[i]);
250: return 0;
251: }
252: }
253: return 1;
254: }
255:
1.274 djm 256: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
257: #define X11_TIMEOUT_SLACK 60
1.279 djm 258: int
1.303 djm 259: client_x11_get_proto(struct ssh *ssh, const char *display,
260: const char *xauth_path, u_int trusted, u_int timeout,
261: char **_proto, char **_data)
1.138 djm 262: {
1.318 djm 263: char *cmd, line[512], xdisplay[512];
1.279 djm 264: char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
1.138 djm 265: static char proto[512], data[512];
266: FILE *f;
1.288 tedu 267: int got_data = 0, generated = 0, do_unlink = 0, r;
1.138 djm 268: struct stat st;
1.274 djm 269: u_int now, x11_timeout_real;
1.138 djm 270:
271: *_proto = proto;
272: *_data = data;
1.279 djm 273: proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
1.138 djm 274:
1.279 djm 275: if (!client_x11_display_valid(display)) {
1.283 millert 276: if (display != NULL)
277: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
278: display);
1.279 djm 279: return -1;
280: }
281: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
1.138 djm 282: debug("No xauth program.");
1.279 djm 283: xauth_path = NULL;
284: }
285:
286: if (xauth_path != NULL) {
1.138 djm 287: /*
288: * Handle FamilyLocal case where $DISPLAY does
289: * not match an authorization entry. For this we
290: * just try "xauth list unix:displaynum.screennum".
291: * XXX: "localhost" match to determine FamilyLocal
292: * is not perfect.
293: */
294: if (strncmp(display, "localhost:", 10) == 0) {
1.279 djm 295: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
296: display + 10)) < 0 ||
297: (size_t)r >= sizeof(xdisplay)) {
1.354 djm 298: error_f("display name too long");
1.279 djm 299: return -1;
300: }
1.138 djm 301: display = xdisplay;
302: }
303: if (trusted == 0) {
1.274 djm 304: /*
1.279 djm 305: * Generate an untrusted X11 auth cookie.
306: *
1.274 djm 307: * The authentication cookie should briefly outlive
308: * ssh's willingness to forward X11 connections to
309: * avoid nasty fail-open behaviour in the X server.
310: */
1.279 djm 311: mktemp_proto(xauthdir, sizeof(xauthdir));
312: if (mkdtemp(xauthdir) == NULL) {
1.354 djm 313: error_f("mkdtemp: %s", strerror(errno));
1.279 djm 314: return -1;
315: }
316: do_unlink = 1;
317: if ((r = snprintf(xauthfile, sizeof(xauthfile),
318: "%s/xauthfile", xauthdir)) < 0 ||
319: (size_t)r >= sizeof(xauthfile)) {
1.354 djm 320: error_f("xauthfile path too long");
1.279 djm 321: rmdir(xauthdir);
322: return -1;
323: }
324:
1.318 djm 325: if (timeout == 0) {
326: /* auth doesn't time out */
327: xasprintf(&cmd, "%s -f %s generate %s %s "
328: "untrusted 2>%s",
329: xauth_path, xauthfile, display,
330: SSH_X11_PROTO, _PATH_DEVNULL);
331: } else {
332: /* Add some slack to requested expiry */
333: if (timeout < UINT_MAX - X11_TIMEOUT_SLACK)
334: x11_timeout_real = timeout +
335: X11_TIMEOUT_SLACK;
336: else {
337: /* Don't overflow on long timeouts */
338: x11_timeout_real = UINT_MAX;
339: }
340: xasprintf(&cmd, "%s -f %s generate %s %s "
341: "untrusted timeout %u 2>%s",
342: xauth_path, xauthfile, display,
343: SSH_X11_PROTO, x11_timeout_real,
344: _PATH_DEVNULL);
345: }
1.354 djm 346: debug2_f("xauth command: %s", cmd);
1.318 djm 347:
348: if (timeout != 0 && x11_refuse_time == 0) {
1.279 djm 349: now = monotime() + 1;
350: if (UINT_MAX - timeout < now)
351: x11_refuse_time = UINT_MAX;
352: else
353: x11_refuse_time = now + timeout;
1.303 djm 354: channel_set_x11_refuse_time(ssh,
355: x11_refuse_time);
1.138 djm 356: }
1.279 djm 357: if (system(cmd) == 0)
358: generated = 1;
1.318 djm 359: free(cmd);
1.138 djm 360: }
1.181 markus 361:
362: /*
363: * When in untrusted mode, we read the cookie only if it was
364: * successfully generated as an untrusted one in the step
365: * above.
366: */
367: if (trusted || generated) {
1.318 djm 368: xasprintf(&cmd,
1.181 markus 369: "%s %s%s list %s 2>" _PATH_DEVNULL,
370: xauth_path,
371: generated ? "-f " : "" ,
372: generated ? xauthfile : "",
373: display);
374: debug2("x11_get_proto: %s", cmd);
375: f = popen(cmd, "r");
376: if (f && fgets(line, sizeof(line), f) &&
377: sscanf(line, "%*s %511s %511s", proto, data) == 2)
378: got_data = 1;
379: if (f)
380: pclose(f);
1.318 djm 381: free(cmd);
1.279 djm 382: }
1.138 djm 383: }
384:
385: if (do_unlink) {
386: unlink(xauthfile);
387: rmdir(xauthdir);
388: }
389:
1.279 djm 390: /* Don't fall back to fake X11 data for untrusted forwarding */
391: if (!trusted && !got_data) {
392: error("Warning: untrusted X11 forwarding setup failed: "
393: "xauth key data not generated");
394: return -1;
395: }
396:
1.138 djm 397: /*
398: * If we didn't get authentication data, just make up some
399: * data. The forwarding code will check the validity of the
400: * response anyway, and substitute this data. The X11
401: * server, however, will ignore this fake data and use
402: * whatever authentication mechanisms it was using otherwise
403: * for the local connection.
404: */
405: if (!got_data) {
1.288 tedu 406: u_int8_t rnd[16];
407: u_int i;
1.138 djm 408:
409: logit("Warning: No xauth data; "
410: "using fake authentication data for X11 forwarding.");
411: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.288 tedu 412: arc4random_buf(rnd, sizeof(rnd));
413: for (i = 0; i < sizeof(rnd); i++) {
1.138 djm 414: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.288 tedu 415: rnd[i]);
1.138 djm 416: }
417: }
1.279 djm 418:
419: return 0;
1.1 deraadt 420: }
421:
1.13 markus 422: /*
423: * Checks if the client window has changed, and sends a packet about it to
424: * the server if so. The actual change is detected elsewhere (by a software
425: * interrupt on Unix); this just checks the flag and sends a message if
426: * appropriate.
427: */
1.1 deraadt 428:
1.77 itojun 429: static void
1.303 djm 430: client_check_window_change(struct ssh *ssh)
1.1 deraadt 431: {
1.292 djm 432: if (!received_window_change_signal)
1.16 markus 433: return;
434: received_window_change_signal = 0;
1.354 djm 435: debug2_f("changed");
1.303 djm 436: channel_send_window_changes(ssh);
1.1 deraadt 437: }
438:
1.264 markus 439: static int
1.297 markus 440: client_global_request_reply(int type, u_int32_t seq, struct ssh *ssh)
1.117 markus 441: {
1.196 djm 442: struct global_confirm *gc;
443:
444: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 445: return 0;
1.196 djm 446: if (gc->cb != NULL)
1.303 djm 447: gc->cb(ssh, type, seq, gc->ctx);
1.196 djm 448: if (--gc->ref_count <= 0) {
449: TAILQ_REMOVE(&global_confirms, gc, entry);
1.342 jsg 450: freezero(gc, sizeof(*gc));
1.196 djm 451: }
452:
1.320 djm 453: ssh_packet_set_alive_timeouts(ssh, 0);
1.264 markus 454: return 0;
1.117 markus 455: }
456:
457: static void
1.345 dtucker 458: schedule_server_alive_check(void)
459: {
460: if (options.server_alive_interval > 0)
461: server_alive_time = monotime() + options.server_alive_interval;
462: }
463:
464: static void
1.320 djm 465: server_alive_check(struct ssh *ssh)
1.117 markus 466: {
1.320 djm 467: int r;
468:
469: if (ssh_packet_inc_alive_timeouts(ssh) > options.server_alive_count_max) {
1.228 djm 470: logit("Timeout, server %s not responding.", host);
1.176 markus 471: cleanup_exit(255);
472: }
1.320 djm 473: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
474: (r = sshpkt_put_cstring(ssh, "keepalive@openssh.com")) != 0 ||
475: (r = sshpkt_put_u8(ssh, 1)) != 0 || /* boolean: want reply */
476: (r = sshpkt_send(ssh)) != 0)
1.354 djm 477: fatal_fr(r, "send packet");
1.196 djm 478: /* Insert an empty placeholder to maintain ordering */
479: client_register_global_confirm(NULL, NULL);
1.345 dtucker 480: schedule_server_alive_check();
1.117 markus 481: }
482:
1.13 markus 483: /*
484: * Waits until the client can do something (some data becomes available on
485: * one of the file descriptors).
486: */
1.77 itojun 487: static void
1.374 djm 488: client_wait_until_can_do_something(struct ssh *ssh, struct pollfd **pfdp,
489: u_int *npfd_allocp, u_int *npfd_activep, int rekeying,
490: int *conn_in_readyp, int *conn_out_readyp)
1.11 markus 491: {
1.374 djm 492: int timeout_secs, pollwait;
1.345 dtucker 493: time_t minwait_secs = 0, now = monotime();
1.315 markus 494: int r, ret;
1.374 djm 495: u_int p;
1.117 markus 496:
1.374 djm 497: *conn_in_readyp = *conn_out_readyp = 0;
1.11 markus 498:
1.374 djm 499: /* Prepare channel poll. First two pollfd entries are reserved */
500: channel_prepare_poll(ssh, pfdp, npfd_allocp, npfd_activep, 2,
501: &minwait_secs);
502: if (*npfd_activep < 2)
503: fatal_f("bad npfd %u", *npfd_activep); /* shouldn't happen */
504:
505: /* channel_prepare_poll could have closed the last channel */
1.303 djm 506: if (session_closed && !channel_still_open(ssh) &&
1.320 djm 507: !ssh_packet_have_data_to_write(ssh)) {
1.374 djm 508: /* clear events since we did not call poll() */
509: for (p = 0; p < *npfd_activep; p++)
510: (*pfdp)[p].revents = 0;
1.292 djm 511: return;
1.16 markus 512: }
1.11 markus 513:
1.374 djm 514: /* Monitor server connection on reserved pollfd entries */
515: (*pfdp)[0].fd = connection_in;
516: (*pfdp)[0].events = POLLIN;
517: (*pfdp)[1].fd = connection_out;
518: (*pfdp)[1].events = ssh_packet_have_data_to_write(ssh) ? POLLOUT : 0;
1.11 markus 519:
1.13 markus 520: /*
521: * Wait for something to happen. This will suspend the process until
1.374 djm 522: * some polled descriptor can be read, written, or has some other
1.222 djm 523: * event pending, or a timeout expires.
1.13 markus 524: */
1.11 markus 525:
1.222 djm 526: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.345 dtucker 527: if (options.server_alive_interval > 0)
528: timeout_secs = MAXIMUM(server_alive_time - now, 0);
1.292 djm 529: if (options.rekey_interval > 0 && !rekeying)
1.320 djm 530: timeout_secs = MINIMUM(timeout_secs,
531: ssh_packet_get_rekey_timeout(ssh));
1.303 djm 532: set_control_persist_exit_time(ssh);
1.222 djm 533: if (control_persist_exit_time > 0) {
1.287 deraadt 534: timeout_secs = MINIMUM(timeout_secs,
1.249 dtucker 535: control_persist_exit_time - now);
1.222 djm 536: if (timeout_secs < 0)
537: timeout_secs = 0;
538: }
1.239 djm 539: if (minwait_secs != 0)
1.287 deraadt 540: timeout_secs = MINIMUM(timeout_secs, (int)minwait_secs);
1.222 djm 541: if (timeout_secs == INT_MAX)
1.374 djm 542: pollwait = -1;
543: else if (timeout_secs >= INT_MAX / 1000)
544: pollwait = INT_MAX;
545: else
546: pollwait = timeout_secs * 1000;
547:
548: ret = poll(*pfdp, *npfd_activep, pollwait);
1.222 djm 549:
1.326 deraadt 550: if (ret == -1) {
1.51 markus 551: /*
1.374 djm 552: * We have to clear the events because we return.
1.51 markus 553: * We have to return, because the mainloop checks for the flags
554: * set by the signal handlers.
555: */
1.374 djm 556: for (p = 0; p < *npfd_activep; p++)
557: (*pfdp)[p].revents = 0;
1.11 markus 558: if (errno == EINTR)
559: return;
560: /* Note: we might still have data in the buffers. */
1.315 markus 561: if ((r = sshbuf_putf(stderr_buffer,
1.374 djm 562: "poll: %s\r\n", strerror(errno))) != 0)
1.354 djm 563: fatal_fr(r, "sshbuf_putf");
1.11 markus 564: quit_pending = 1;
1.374 djm 565: return;
566: }
567:
568: *conn_in_readyp = (*pfdp)[0].revents != 0;
569: *conn_out_readyp = (*pfdp)[1].revents != 0;
570:
571: if (options.server_alive_interval > 0 && !*conn_in_readyp &&
572: monotime() >= server_alive_time) {
1.249 dtucker 573: /*
1.374 djm 574: * ServerAlive check is needed. We can't rely on the poll
1.345 dtucker 575: * timing out since traffic on the client side such as port
576: * forwards can keep waking it up.
1.249 dtucker 577: */
1.345 dtucker 578: server_alive_check(ssh);
1.374 djm 579: }
1.11 markus 580: }
581:
1.77 itojun 582: static void
1.315 markus 583: client_suspend_self(struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr)
1.1 deraadt 584: {
1.11 markus 585: /* Flush stdout and stderr buffers. */
1.315 markus 586: if (sshbuf_len(bout) > 0)
587: atomicio(vwrite, fileno(stdout), sshbuf_mutable_ptr(bout),
588: sshbuf_len(bout));
589: if (sshbuf_len(berr) > 0)
590: atomicio(vwrite, fileno(stderr), sshbuf_mutable_ptr(berr),
591: sshbuf_len(berr));
1.11 markus 592:
1.233 djm 593: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 594:
1.305 djm 595: sshbuf_reset(bin);
596: sshbuf_reset(bout);
597: sshbuf_reset(berr);
1.11 markus 598:
599: /* Send the suspend signal to the program itself. */
600: kill(getpid(), SIGTSTP);
601:
1.132 djm 602: /* Reset window sizes in case they have changed */
603: received_window_change_signal = 1;
1.11 markus 604:
1.233 djm 605: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 606: }
607:
1.77 itojun 608: static void
1.374 djm 609: client_process_net_input(struct ssh *ssh)
1.11 markus 610: {
1.17 markus 611: char buf[8192];
1.315 markus 612: int r, len;
1.11 markus 613:
1.13 markus 614: /*
615: * Read input from the server, and add any such data to the buffer of
616: * the packet subsystem.
617: */
1.374 djm 618: schedule_server_alive_check();
619: /* Read as much as possible. */
620: len = read(connection_in, buf, sizeof(buf));
621: if (len == 0) {
622: /* Received EOF. The remote host has closed the connection. */
623: if ((r = sshbuf_putf(stderr_buffer,
624: "Connection to %.300s closed by remote host.\r\n",
625: host)) != 0)
626: fatal_fr(r, "sshbuf_putf");
627: quit_pending = 1;
628: return;
629: }
630: /*
631: * There is a kernel bug on Solaris that causes poll to
632: * sometimes wake up even though there is no data available.
633: */
634: if (len == -1 && (errno == EAGAIN || errno == EINTR))
635: len = 0;
636:
637: if (len == -1) {
1.13 markus 638: /*
1.374 djm 639: * An error has encountered. Perhaps there is a
640: * network problem.
1.13 markus 641: */
1.374 djm 642: if ((r = sshbuf_putf(stderr_buffer,
643: "Read from remote host %.300s: %.100s\r\n",
644: host, strerror(errno))) != 0)
645: fatal_fr(r, "sshbuf_putf");
646: quit_pending = 1;
647: return;
1.11 markus 648: }
1.374 djm 649: ssh_packet_process_incoming(ssh, buf, len);
1.17 markus 650: }
1.16 markus 651:
1.97 jakob 652: static void
1.303 djm 653: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 654: {
1.190 djm 655: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
656: char errmsg[256];
1.315 markus 657: int r, tochan;
1.190 djm 658:
1.234 djm 659: /*
660: * If a TTY was explicitly requested, then a failure to allocate
661: * one is fatal.
662: */
663: if (cr->action == CONFIRM_TTY &&
664: (options.request_tty == REQUEST_TTY_FORCE ||
665: options.request_tty == REQUEST_TTY_YES))
666: cr->action = CONFIRM_CLOSE;
667:
1.312 djm 668: /* XXX suppress on mux _client_ quietmode */
1.190 djm 669: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 670: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 671:
672: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
673: debug2("%s request accepted on channel %d",
674: cr->request_type, c->self);
675: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
676: if (tochan) {
677: snprintf(errmsg, sizeof(errmsg),
678: "%s request failed\r\n", cr->request_type);
679: } else {
680: snprintf(errmsg, sizeof(errmsg),
681: "%s request failed on channel %d",
682: cr->request_type, c->self);
683: }
684: /* If error occurred on primary session channel, then exit */
1.234 djm 685: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 686: fatal("%s", errmsg);
1.234 djm 687: /*
688: * If error occurred on mux client, append to
689: * their stderr.
690: */
691: if (tochan) {
1.360 djm 692: debug3_f("channel %d: mux request: %s", c->self,
693: cr->request_type);
1.315 markus 694: if ((r = sshbuf_put(c->extended, errmsg,
695: strlen(errmsg))) != 0)
1.354 djm 696: fatal_fr(r, "sshbuf_put");
1.234 djm 697: } else
1.190 djm 698: error("%s", errmsg);
1.234 djm 699: if (cr->action == CONFIRM_TTY) {
700: /*
701: * If a TTY allocation error occurred, then arrange
702: * for the correct TTY to leave raw mode.
703: */
704: if (c->self == session_ident)
705: leave_raw_mode(0);
706: else
1.303 djm 707: mux_tty_alloc_failed(ssh, c);
1.234 djm 708: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 709: chan_read_failed(ssh, c);
710: chan_write_failed(ssh, c);
1.190 djm 711: }
712: }
1.250 djm 713: free(cr);
1.190 djm 714: }
715:
716: static void
1.303 djm 717: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 718: {
1.250 djm 719: free(ctx);
1.190 djm 720: }
1.129 deraadt 721:
1.236 djm 722: void
1.303 djm 723: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 724: enum confirm_action action)
1.190 djm 725: {
1.255 djm 726: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 727:
1.190 djm 728: cr->request_type = request;
1.234 djm 729: cr->action = action;
1.123 djm 730:
1.303 djm 731: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 732: client_abandon_status_confirm, cr);
1.196 djm 733: }
734:
735: void
736: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
737: {
1.201 djm 738: struct global_confirm *gc, *last_gc;
1.196 djm 739:
740: /* Coalesce identical callbacks */
1.201 djm 741: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
742: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
743: if (++last_gc->ref_count >= INT_MAX)
1.354 djm 744: fatal_f("last_gc->ref_count = %d",
745: last_gc->ref_count);
1.196 djm 746: return;
747: }
748:
1.255 djm 749: gc = xcalloc(1, sizeof(*gc));
1.196 djm 750: gc->cb = cb;
751: gc->ctx = ctx;
752: gc->ref_count = 1;
753: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 754: }
755:
756: static void
1.303 djm 757: process_cmdline(struct ssh *ssh)
1.97 jakob 758: {
759: void (*handler)(int);
1.261 millert 760: char *s, *cmd;
761: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
762: struct Forward fwd;
1.97 jakob 763:
1.257 tedu 764: memset(&fwd, 0, sizeof(fwd));
1.183 djm 765:
1.233 djm 766: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.332 dtucker 767: handler = ssh_signal(SIGINT, SIG_IGN);
1.99 markus 768: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 769: if (s == NULL)
770: goto out;
1.256 deraadt 771: while (isspace((u_char)*s))
1.97 jakob 772: s++;
1.121 djm 773: if (*s == '-')
774: s++; /* Skip cmdline '-', if any */
1.120 dtucker 775: if (*s == '\0')
1.97 jakob 776: goto out;
1.121 djm 777:
1.122 djm 778: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 779: logit("Commands:");
1.164 djm 780: logit(" -L[bind_address:]port:host:hostport "
781: "Request local forward");
782: logit(" -R[bind_address:]port:host:hostport "
783: "Request remote forward");
1.204 stevesk 784: logit(" -D[bind_address:]port "
785: "Request dynamic forward");
1.237 markus 786: logit(" -KL[bind_address:]port "
787: "Cancel local forward");
1.165 stevesk 788: logit(" -KR[bind_address:]port "
1.164 djm 789: "Cancel remote forward");
1.237 markus 790: logit(" -KD[bind_address:]port "
791: "Cancel dynamic forward");
1.146 reyk 792: if (!options.permit_local_command)
793: goto out;
1.164 djm 794: logit(" !args "
795: "Execute local command");
1.146 reyk 796: goto out;
797: }
798:
799: if (*s == '!' && options.permit_local_command) {
800: s++;
801: ssh_local_cmd(s);
1.121 djm 802: goto out;
803: }
804:
805: if (*s == 'K') {
806: delete = 1;
807: s++;
808: }
1.204 stevesk 809: if (*s == 'L')
810: local = 1;
811: else if (*s == 'R')
812: remote = 1;
813: else if (*s == 'D')
814: dynamic = 1;
815: else {
1.109 itojun 816: logit("Invalid command.");
1.97 jakob 817: goto out;
818: }
1.204 stevesk 819:
1.256 deraadt 820: while (isspace((u_char)*++s))
1.179 tedu 821: ;
1.97 jakob 822:
1.217 djm 823: /* XXX update list of forwards in options */
1.121 djm 824: if (delete) {
1.261 millert 825: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
826: if (!parse_forward(&fwd, s, 1, 0)) {
827: logit("Bad forwarding close specification.");
1.121 djm 828: goto out;
829: }
1.237 markus 830: if (remote)
1.303 djm 831: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 832: else if (dynamic)
1.303 djm 833: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 834: 0, &options.fwd_opts) > 0;
1.237 markus 835: else
1.303 djm 836: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 837: CHANNEL_CANCEL_PORT_STATIC,
838: &options.fwd_opts) > 0;
1.237 markus 839: if (!ok) {
1.290 dtucker 840: logit("Unknown port forwarding.");
1.237 markus 841: goto out;
842: }
843: logit("Canceled forwarding.");
1.121 djm 844: } else {
1.209 djm 845: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 846: logit("Bad forwarding specification.");
847: goto out;
848: }
1.204 stevesk 849: if (local || dynamic) {
1.303 djm 850: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 851: &options.fwd_opts)) {
1.121 djm 852: logit("Port forwarding failed.");
853: goto out;
854: }
1.135 djm 855: } else {
1.303 djm 856: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 857: logit("Port forwarding failed.");
858: goto out;
859: }
1.135 djm 860: }
1.121 djm 861: logit("Forwarding port.");
862: }
863:
1.97 jakob 864: out:
1.332 dtucker 865: ssh_signal(SIGINT, handler);
1.233 djm 866: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 867: free(cmd);
868: free(fwd.listen_host);
1.261 millert 869: free(fwd.listen_path);
1.250 djm 870: free(fwd.connect_host);
1.261 millert 871: free(fwd.connect_path);
1.97 jakob 872: }
873:
1.244 dtucker 874: /* reasons to suppress output of an escape command in help output */
875: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 876: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
877: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
878: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.244 dtucker 879: struct escape_help_text {
880: const char *cmd;
881: const char *text;
882: unsigned int flags;
883: };
884: static struct escape_help_text esc_txt[] = {
885: {".", "terminate session", SUPPRESS_MUXMASTER},
886: {".", "terminate connection (and any multiplexed sessions)",
887: SUPPRESS_MUXCLIENT},
1.292 djm 888: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.244 dtucker 889: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1.292 djm 890: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 891: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 892: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
893: {"#", "list forwarded connections", SUPPRESS_NEVER},
894: {"&", "background ssh (when waiting for connections to terminate)",
895: SUPPRESS_MUXCLIENT},
896: {"?", "this message", SUPPRESS_NEVER},
897: };
898:
899: static void
1.315 markus 900: print_escape_help(struct sshbuf *b, int escape_char, int mux_client,
901: int using_stderr)
1.244 dtucker 902: {
903: unsigned int i, suppress_flags;
1.315 markus 904: int r;
1.244 dtucker 905:
1.315 markus 906: if ((r = sshbuf_putf(b,
907: "%c?\r\nSupported escape sequences:\r\n", escape_char)) != 0)
1.354 djm 908: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 909:
1.292 djm 910: suppress_flags =
1.244 dtucker 911: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
912: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
913: (using_stderr ? 0 : SUPPRESS_SYSLOG);
914:
915: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
916: if (esc_txt[i].flags & suppress_flags)
917: continue;
1.315 markus 918: if ((r = sshbuf_putf(b, " %c%-3s - %s\r\n",
919: escape_char, esc_txt[i].cmd, esc_txt[i].text)) != 0)
1.354 djm 920: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 921: }
922:
1.315 markus 923: if ((r = sshbuf_putf(b,
1.246 dtucker 924: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 925: "(Note that escapes are only recognized immediately after "
1.315 markus 926: "newline.)\r\n", escape_char, escape_char)) != 0)
1.354 djm 927: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 928: }
929:
1.314 djm 930: /*
1.296 naddy 931: * Process the characters one by one.
1.195 djm 932: */
1.77 itojun 933: static int
1.303 djm 934: process_escapes(struct ssh *ssh, Channel *c,
1.315 markus 935: struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr,
1.195 djm 936: char *buf, int len)
1.31 markus 937: {
938: pid_t pid;
1.315 markus 939: int r, bytes = 0;
1.42 markus 940: u_int i;
941: u_char ch;
1.31 markus 942: char *s;
1.294 djm 943: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
944: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 945:
1.294 djm 946: if (c->filter_ctx == NULL)
947: return 0;
1.314 djm 948:
1.139 djm 949: if (len <= 0)
950: return (0);
951:
952: for (i = 0; i < (u_int)len; i++) {
1.31 markus 953: /* Get one character at a time. */
954: ch = buf[i];
955:
1.294 djm 956: if (efc->escape_pending) {
1.31 markus 957: /* We have previously seen an escape character. */
958: /* Clear the flag now. */
1.294 djm 959: efc->escape_pending = 0;
1.31 markus 960:
961: /* Process the escaped character. */
962: switch (ch) {
963: case '.':
964: /* Terminate the connection. */
1.315 markus 965: if ((r = sshbuf_putf(berr, "%c.\r\n",
966: efc->escape_char)) != 0)
1.354 djm 967: fatal_fr(r, "sshbuf_putf");
1.217 djm 968: if (c && c->ctl_chan != -1) {
1.303 djm 969: chan_read_failed(ssh, c);
970: chan_write_failed(ssh, c);
971: if (c->detach_user) {
972: c->detach_user(ssh,
973: c->self, NULL);
974: }
1.253 dtucker 975: c->type = SSH_CHANNEL_ABANDONED;
1.315 markus 976: sshbuf_reset(c->input);
1.303 djm 977: chan_ibuf_empty(ssh, c);
1.195 djm 978: return 0;
979: } else
980: quit_pending = 1;
1.31 markus 981: return -1;
982:
983: case 'Z' - 64:
1.195 djm 984: /* XXX support this for mux clients */
1.217 djm 985: if (c && c->ctl_chan != -1) {
1.245 dtucker 986: char b[16];
1.195 djm 987: noescape:
1.245 dtucker 988: if (ch == 'Z' - 64)
989: snprintf(b, sizeof b, "^Z");
990: else
991: snprintf(b, sizeof b, "%c", ch);
1.315 markus 992: if ((r = sshbuf_putf(berr,
1.245 dtucker 993: "%c%s escape not available to "
1.195 djm 994: "multiplexed sessions\r\n",
1.315 markus 995: efc->escape_char, b)) != 0)
1.354 djm 996: fatal_fr(r, "sshbuf_putf");
1.195 djm 997: continue;
998: }
1.197 djm 999: /* Suspend the program. Inform the user */
1.315 markus 1000: if ((r = sshbuf_putf(berr,
1001: "%c^Z [suspend ssh]\r\n",
1002: efc->escape_char)) != 0)
1.354 djm 1003: fatal_fr(r, "sshbuf_putf");
1.31 markus 1004:
1005: /* Restore terminal modes and suspend. */
1006: client_suspend_self(bin, bout, berr);
1007:
1008: /* We have been continued. */
1009: continue;
1010:
1.111 markus 1011: case 'B':
1.315 markus 1012: if ((r = sshbuf_putf(berr,
1013: "%cB\r\n", efc->escape_char)) != 0)
1.354 djm 1014: fatal_fr(r, "sshbuf_putf");
1.303 djm 1015: channel_request_start(ssh, c->self, "break", 0);
1.315 markus 1016: if ((r = sshpkt_put_u32(ssh, 1000)) != 0 ||
1017: (r = sshpkt_send(ssh)) != 0)
1.354 djm 1018: fatal_fr(r, "send packet");
1.111 markus 1019: continue;
1020:
1.54 markus 1021: case 'R':
1.357 djm 1022: if (ssh->compat & SSH_BUG_NOREKEY)
1.292 djm 1023: logit("Server does not "
1024: "support re-keying");
1025: else
1026: need_rekeying = 1;
1.54 markus 1027: continue;
1028:
1.242 dtucker 1029: case 'V':
1030: /* FALLTHROUGH */
1031: case 'v':
1032: if (c && c->ctl_chan != -1)
1033: goto noescape;
1034: if (!log_is_on_stderr()) {
1.315 markus 1035: if ((r = sshbuf_putf(berr,
1.242 dtucker 1036: "%c%c [Logging to syslog]\r\n",
1.315 markus 1037: efc->escape_char, ch)) != 0)
1.354 djm 1038: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1039: continue;
1040: }
1041: if (ch == 'V' && options.log_level >
1042: SYSLOG_LEVEL_QUIET)
1043: log_change_level(--options.log_level);
1044: if (ch == 'v' && options.log_level <
1045: SYSLOG_LEVEL_DEBUG3)
1046: log_change_level(++options.log_level);
1.315 markus 1047: if ((r = sshbuf_putf(berr,
1.294 djm 1048: "%c%c [LogLevel %s]\r\n",
1049: efc->escape_char, ch,
1.315 markus 1050: log_level_name(options.log_level))) != 0)
1.354 djm 1051: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1052: continue;
1053:
1.31 markus 1054: case '&':
1.217 djm 1055: if (c && c->ctl_chan != -1)
1.195 djm 1056: goto noescape;
1.31 markus 1057: /*
1.197 djm 1058: * Detach the program (continue to serve
1059: * connections, but put in background and no
1060: * more new connections).
1.31 markus 1061: */
1062: /* Restore tty modes. */
1.233 djm 1063: leave_raw_mode(
1064: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1065:
1066: /* Stop listening for new connections. */
1.303 djm 1067: channel_stop_listening(ssh);
1.31 markus 1068:
1.354 djm 1069: if ((r = sshbuf_putf(berr, "%c& "
1070: "[backgrounded]\n", efc->escape_char)) != 0)
1071: fatal_fr(r, "sshbuf_putf");
1.31 markus 1072:
1073: /* Fork into background. */
1074: pid = fork();
1.326 deraadt 1075: if (pid == -1) {
1.31 markus 1076: error("fork: %.100s", strerror(errno));
1077: continue;
1078: }
1079: if (pid != 0) { /* This is the parent. */
1080: /* The parent just exits. */
1081: exit(0);
1082: }
1083: /* The child continues serving connections. */
1.292 djm 1084: /* fake EOF on stdin */
1.315 markus 1085: if ((r = sshbuf_put_u8(bin, 4)) != 0)
1.354 djm 1086: fatal_fr(r, "sshbuf_put_u8");
1.292 djm 1087: return -1;
1.31 markus 1088: case '?':
1.294 djm 1089: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1090: (c && c->ctl_chan != -1),
1091: log_is_on_stderr());
1.31 markus 1092: continue;
1093:
1094: case '#':
1.315 markus 1095: if ((r = sshbuf_putf(berr, "%c#\r\n",
1096: efc->escape_char)) != 0)
1.354 djm 1097: fatal_fr(r, "sshbuf_putf");
1.303 djm 1098: s = channel_open_message(ssh);
1.315 markus 1099: if ((r = sshbuf_put(berr, s, strlen(s))) != 0)
1.354 djm 1100: fatal_fr(r, "sshbuf_put");
1.250 djm 1101: free(s);
1.97 jakob 1102: continue;
1103:
1104: case 'C':
1.217 djm 1105: if (c && c->ctl_chan != -1)
1.206 djm 1106: goto noescape;
1.303 djm 1107: process_cmdline(ssh);
1.31 markus 1108: continue;
1109:
1110: default:
1.294 djm 1111: if (ch != efc->escape_char) {
1.315 markus 1112: if ((r = sshbuf_put_u8(bin,
1113: efc->escape_char)) != 0)
1.354 djm 1114: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1115: bytes++;
1116: }
1117: /* Escaped characters fall through here */
1118: break;
1119: }
1120: } else {
1121: /*
1.197 djm 1122: * The previous character was not an escape char.
1123: * Check if this is an escape.
1.31 markus 1124: */
1.294 djm 1125: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1126: /*
1127: * It is. Set the flag and continue to
1128: * next character.
1129: */
1.294 djm 1130: efc->escape_pending = 1;
1.31 markus 1131: continue;
1132: }
1133: }
1134:
1135: /*
1136: * Normal character. Record whether it was a newline,
1137: * and append it to the buffer.
1138: */
1139: last_was_cr = (ch == '\r' || ch == '\n');
1.315 markus 1140: if ((r = sshbuf_put_u8(bin, ch)) != 0)
1.354 djm 1141: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1142: bytes++;
1143: }
1144: return bytes;
1145: }
1146:
1.13 markus 1147: /*
1.15 markus 1148: * Get packets from the connection input buffer, and process them as long as
1149: * there are packets available.
1150: *
1151: * Any unknown packets received during the actual
1152: * session cause the session to terminate. This is
1153: * intended to make debugging easier since no
1154: * confirmations are sent. Any compatible protocol
1155: * extensions must be negotiated during the
1156: * preparatory phase.
1157: */
1158:
1.77 itojun 1159: static void
1.321 djm 1160: client_process_buffered_input_packets(struct ssh *ssh)
1.15 markus 1161: {
1.321 djm 1162: ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1163: }
1164:
1.31 markus 1165: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1166:
1.195 djm 1167: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1168: void *
1169: client_new_escape_filter_ctx(int escape_char)
1170: {
1171: struct escape_filter_ctx *ret;
1172:
1.255 djm 1173: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1174: ret->escape_pending = 0;
1175: ret->escape_char = escape_char;
1176: return (void *)ret;
1177: }
1178:
1.198 djm 1179: /* Free the escape filter context on channel free */
1180: void
1.303 djm 1181: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1182: {
1.250 djm 1183: free(ctx);
1.198 djm 1184: }
1185:
1.195 djm 1186: int
1.303 djm 1187: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1188: {
1.190 djm 1189: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1190: return 0;
1191:
1.303 djm 1192: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1193: buf, len);
1.30 markus 1194: }
1195:
1.77 itojun 1196: static void
1.303 djm 1197: client_channel_closed(struct ssh *ssh, int id, void *arg)
1.60 markus 1198: {
1.303 djm 1199: channel_cancel_cleanup(ssh, id);
1.60 markus 1200: session_closed = 1;
1.233 djm 1201: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1202: }
1203:
1.15 markus 1204: /*
1.13 markus 1205: * Implements the interactive session with the server. This is called after
1206: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1207: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1208: * used as an escape character for terminating or suspending the session.
1.13 markus 1209: */
1.20 markus 1210: int
1.303 djm 1211: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1212: int ssh2_chan_id)
1.1 deraadt 1213: {
1.374 djm 1214: struct pollfd *pfd = NULL;
1215: u_int npfd_alloc = 0, npfd_active = 0;
1.11 markus 1216: double start_time, total_time;
1.374 djm 1217: int r, len;
1.200 markus 1218: u_int64_t ibytes, obytes;
1.374 djm 1219: int conn_in_ready, conn_out_ready;
1.11 markus 1220:
1221: debug("Entering interactive session.");
1.277 semarie 1222:
1.278 semarie 1223: if (options.control_master &&
1.286 djm 1224: !option_clear_or_none(options.control_path)) {
1.278 semarie 1225: debug("pledge: id");
1.327 mestre 1226: if (pledge("stdio rpath wpath cpath unix inet dns recvfd sendfd proc exec id tty",
1.278 semarie 1227: NULL) == -1)
1.354 djm 1228: fatal_f("pledge(): %s", strerror(errno));
1.278 semarie 1229:
1230: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1231: debug("pledge: exec");
1232: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1233: NULL) == -1)
1.354 djm 1234: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1235:
1236: } else if (options.update_hostkeys) {
1.373 jsg 1237: debug("pledge: filesystem");
1.277 semarie 1238: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1239: NULL) == -1)
1.354 djm 1240: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1241:
1.286 djm 1242: } else if (!option_clear_or_none(options.proxy_command) ||
1.369 djm 1243: options.fork_after_authentication) {
1.277 semarie 1244: debug("pledge: proc");
1245: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1.354 djm 1246: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1247:
1248: } else {
1249: debug("pledge: network");
1.300 mestre 1250: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.354 djm 1251: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1252: }
1.11 markus 1253:
1.307 dtucker 1254: start_time = monotime_double();
1.11 markus 1255:
1256: /* Initialize variables. */
1257: last_was_cr = 1;
1258: exit_status = -1;
1.320 djm 1259: connection_in = ssh_packet_get_connection_in(ssh);
1260: connection_out = ssh_packet_get_connection_out(ssh);
1.46 markus 1261:
1.11 markus 1262: quit_pending = 0;
1263:
1.315 markus 1264: /* Initialize buffer. */
1265: if ((stderr_buffer = sshbuf_new()) == NULL)
1.354 djm 1266: fatal_f("sshbuf_new failed");
1.11 markus 1267:
1.321 djm 1268: client_init_dispatch(ssh);
1.15 markus 1269:
1.105 markus 1270: /*
1271: * Set signal handlers, (e.g. to restore non-blocking mode)
1272: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1273: */
1.332 dtucker 1274: if (ssh_signal(SIGHUP, SIG_IGN) != SIG_IGN)
1275: ssh_signal(SIGHUP, signal_handler);
1276: if (ssh_signal(SIGINT, SIG_IGN) != SIG_IGN)
1277: ssh_signal(SIGINT, signal_handler);
1278: if (ssh_signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1279: ssh_signal(SIGQUIT, signal_handler);
1280: if (ssh_signal(SIGTERM, SIG_IGN) != SIG_IGN)
1281: ssh_signal(SIGTERM, signal_handler);
1282: ssh_signal(SIGWINCH, window_change_handler);
1.11 markus 1283:
1284: if (have_pty)
1.233 djm 1285: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1286:
1.292 djm 1287: session_ident = ssh2_chan_id;
1288: if (session_ident != -1) {
1289: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1290: channel_register_filter(ssh, session_ident,
1.292 djm 1291: client_simple_escape_filter, NULL,
1292: client_filter_cleanup,
1293: client_new_escape_filter_ctx(
1294: escape_char_arg));
1.232 djm 1295: }
1.303 djm 1296: channel_register_cleanup(ssh, session_ident,
1.292 djm 1297: client_channel_closed, 0);
1.48 markus 1298: }
1.345 dtucker 1299:
1300: schedule_server_alive_check();
1.30 markus 1301:
1.11 markus 1302: /* Main loop of the client for the interactive session mode. */
1303: while (!quit_pending) {
1304:
1.13 markus 1305: /* Process buffered packets sent by the server. */
1.321 djm 1306: client_process_buffered_input_packets(ssh);
1.11 markus 1307:
1.303 djm 1308: if (session_closed && !channel_still_open(ssh))
1.60 markus 1309: break;
1310:
1.303 djm 1311: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1312: debug("rekeying in progress");
1.284 djm 1313: } else if (need_rekeying) {
1314: /* manual rekey request */
1315: debug("need rekeying");
1.303 djm 1316: if ((r = kex_start_rekex(ssh)) != 0)
1.354 djm 1317: fatal_fr(r, "kex_start_rekex");
1.284 djm 1318: need_rekeying = 0;
1.56 markus 1319: } else {
1320: /*
1321: * Make packets from buffered channel data, and
1322: * enqueue them for sending to the server.
1323: */
1.320 djm 1324: if (ssh_packet_not_very_much_data_to_write(ssh))
1.303 djm 1325: channel_output_poll(ssh);
1.11 markus 1326:
1.56 markus 1327: /*
1328: * Check if the window size has changed, and buffer a
1329: * message about it to the server if so.
1330: */
1.303 djm 1331: client_check_window_change(ssh);
1.11 markus 1332:
1.56 markus 1333: if (quit_pending)
1334: break;
1335: }
1.13 markus 1336: /*
1337: * Wait until we have something to do (something becomes
1338: * available on one of the descriptors).
1339: */
1.374 djm 1340: client_wait_until_can_do_something(ssh, &pfd, &npfd_alloc,
1341: &npfd_active, ssh_packet_is_rekeying(ssh),
1342: &conn_in_ready, &conn_out_ready);
1.11 markus 1343:
1344: if (quit_pending)
1345: break;
1346:
1.56 markus 1347: /* Do channel operations unless rekeying in progress. */
1.303 djm 1348: if (!ssh_packet_is_rekeying(ssh))
1.374 djm 1349: channel_after_poll(ssh, pfd, npfd_active);
1.11 markus 1350:
1.17 markus 1351: /* Buffer input from the connection. */
1.374 djm 1352: if (conn_in_ready)
1353: client_process_net_input(ssh);
1.17 markus 1354:
1355: if (quit_pending)
1356: break;
1.367 djm 1357:
1358: /* A timeout may have triggered rekeying */
1359: if ((r = ssh_packet_check_rekey(ssh)) != 0)
1360: fatal_fr(r, "cannot start rekeying");
1.11 markus 1361:
1.197 djm 1362: /*
1363: * Send as much buffered packet data as possible to the
1364: * sender.
1365: */
1.374 djm 1366: if (conn_out_ready) {
1.338 djm 1367: if ((r = ssh_packet_write_poll(ssh)) != 0) {
1368: sshpkt_fatal(ssh, r,
1369: "%s: ssh_packet_write_poll", __func__);
1370: }
1371: }
1.222 djm 1372:
1373: /*
1374: * If we are a backgrounded control master, and the
1375: * timeout has expired without any active client
1376: * connections, then quit.
1377: */
1378: if (control_persist_exit_time > 0) {
1.251 dtucker 1379: if (monotime() >= control_persist_exit_time) {
1.222 djm 1380: debug("ControlPersist timeout expired");
1381: break;
1382: }
1383: }
1.11 markus 1384: }
1.374 djm 1385: free(pfd);
1.11 markus 1386:
1387: /* Terminate the session. */
1388:
1389: /* Stop watching for window change. */
1.332 dtucker 1390: ssh_signal(SIGWINCH, SIG_DFL);
1.211 andreas 1391:
1.320 djm 1392: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
1393: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_BY_APPLICATION)) != 0 ||
1394: (r = sshpkt_put_cstring(ssh, "disconnected by user")) != 0 ||
1395: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language tag */
1396: (r = sshpkt_send(ssh)) != 0 ||
1397: (r = ssh_packet_write_wait(ssh)) != 0)
1.354 djm 1398: fatal_fr(r, "send disconnect");
1.11 markus 1399:
1.303 djm 1400: channel_free_all(ssh);
1.11 markus 1401:
1.75 markus 1402: if (have_pty)
1.233 djm 1403: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.116 dtucker 1404:
1405: /*
1406: * If there was no shell or command requested, there will be no remote
1407: * exit status to be returned. In that case, clear error code if the
1408: * connection was deliberately terminated at this end.
1409: */
1.370 djm 1410: if (options.session_type == SESSION_TYPE_NONE &&
1411: received_signal == SIGTERM) {
1.116 dtucker 1412: received_signal = 0;
1413: exit_status = 0;
1414: }
1.75 markus 1415:
1.301 dtucker 1416: if (received_signal) {
1417: verbose("Killed by signal %d.", (int) received_signal);
1.359 djm 1418: cleanup_exit(255);
1.301 dtucker 1419: }
1.75 markus 1420:
1.13 markus 1421: /*
1422: * In interactive mode (with pseudo tty) display a message indicating
1423: * that the connection has been closed.
1424: */
1.11 markus 1425: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.315 markus 1426: if ((r = sshbuf_putf(stderr_buffer,
1427: "Connection to %.64s closed.\r\n", host)) != 0)
1.354 djm 1428: fatal_fr(r, "sshbuf_putf");
1.11 markus 1429: }
1.70 markus 1430:
1.11 markus 1431: /* Output any buffered data for stderr. */
1.315 markus 1432: if (sshbuf_len(stderr_buffer) > 0) {
1.230 djm 1433: len = atomicio(vwrite, fileno(stderr),
1.315 markus 1434: (u_char *)sshbuf_ptr(stderr_buffer),
1435: sshbuf_len(stderr_buffer));
1436: if (len < 0 || (u_int)len != sshbuf_len(stderr_buffer))
1.11 markus 1437: error("Write failed flushing stderr buffer.");
1.315 markus 1438: else if ((r = sshbuf_consume(stderr_buffer, len)) != 0)
1.354 djm 1439: fatal_fr(r, "sshbuf_consume");
1.11 markus 1440: }
1441:
1442: /* Clear and free any buffers. */
1.315 markus 1443: sshbuf_free(stderr_buffer);
1.11 markus 1444:
1445: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1446: total_time = monotime_double() - start_time;
1.320 djm 1447: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.200 markus 1448: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1449: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1450: if (total_time > 0)
1.200 markus 1451: verbose("Bytes per second: sent %.1f, received %.1f",
1452: obytes / total_time, ibytes / total_time);
1.11 markus 1453: /* Return the exit status of the program. */
1454: debug("Exit status %d", exit_status);
1455: return exit_status;
1.15 markus 1456: }
1457:
1458: /*********/
1459:
1.77 itojun 1460: static Channel *
1.303 djm 1461: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1462: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1463: {
1.103 deraadt 1464: Channel *c = NULL;
1.289 markus 1465: struct sshbuf *b = NULL;
1.40 markus 1466: char *listen_address, *originator_address;
1.320 djm 1467: u_int listen_port, originator_port;
1.289 markus 1468: int r;
1.40 markus 1469:
1470: /* Get rest of the packet */
1.320 djm 1471: if ((r = sshpkt_get_cstring(ssh, &listen_address, NULL)) != 0 ||
1472: (r = sshpkt_get_u32(ssh, &listen_port)) != 0 ||
1473: (r = sshpkt_get_cstring(ssh, &originator_address, NULL)) != 0 ||
1474: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1475: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1476: fatal_fr(r, "parse packet");
1.40 markus 1477:
1.354 djm 1478: debug_f("listen %s port %d, originator %s port %d",
1.261 millert 1479: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1480:
1.320 djm 1481: if (listen_port > 0xffff)
1.354 djm 1482: error_f("invalid listen port");
1.320 djm 1483: else if (originator_port > 0xffff)
1.354 djm 1484: error_f("invalid originator port");
1.320 djm 1485: else {
1486: c = channel_connect_by_listen_address(ssh,
1487: listen_address, listen_port, "forwarded-tcpip",
1488: originator_address);
1489: }
1.40 markus 1490:
1.289 markus 1491: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1492: if ((b = sshbuf_new()) == NULL) {
1.354 djm 1493: error_f("alloc reply");
1.289 markus 1494: goto out;
1495: }
1496: /* reconstruct and send to muxclient */
1497: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1498: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1499: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1500: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1501: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1502: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1503: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1504: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1505: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1506: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1507: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.354 djm 1508: error_fr(r, "compose for muxclient");
1.289 markus 1509: goto out;
1510: }
1511: }
1512:
1513: out:
1514: sshbuf_free(b);
1.250 djm 1515: free(originator_address);
1516: free(listen_address);
1.40 markus 1517: return c;
1518: }
1519:
1.103 deraadt 1520: static Channel *
1.303 djm 1521: client_request_forwarded_streamlocal(struct ssh *ssh,
1522: const char *request_type, int rchan)
1.261 millert 1523: {
1524: Channel *c = NULL;
1525: char *listen_path;
1.320 djm 1526: int r;
1.261 millert 1527:
1528: /* Get the remote path. */
1.320 djm 1529: if ((r = sshpkt_get_cstring(ssh, &listen_path, NULL)) != 0 ||
1530: (r = sshpkt_get_string(ssh, NULL, NULL)) != 0 || /* reserved */
1531: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1532: fatal_fr(r, "parse packet");
1.261 millert 1533:
1.354 djm 1534: debug_f("request: %s", listen_path);
1.261 millert 1535:
1.303 djm 1536: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1537: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1538: free(listen_path);
1539: return c;
1540: }
1541:
1542: static Channel *
1.303 djm 1543: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1544: {
1545: Channel *c = NULL;
1546: char *originator;
1.321 djm 1547: u_int originator_port;
1.320 djm 1548: int r, sock;
1.40 markus 1549:
1550: if (!options.forward_x11) {
1551: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1552: error("Warning: this is probably a break-in attempt by a "
1553: "malicious server.");
1.221 djm 1554: return NULL;
1555: }
1.274 djm 1556: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1557: verbose("Rejected X11 connection after ForwardX11Timeout "
1558: "expired");
1.40 markus 1559: return NULL;
1560: }
1.320 djm 1561: if ((r = sshpkt_get_cstring(ssh, &originator, NULL)) != 0 ||
1.321 djm 1562: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1.320 djm 1563: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1564: fatal_fr(r, "parse packet");
1.40 markus 1565: /* XXX check permission */
1.321 djm 1566: /* XXX range check originator port? */
1567: debug("client_request_x11: request from %s %u", originator,
1.47 markus 1568: originator_port);
1.250 djm 1569: free(originator);
1.303 djm 1570: sock = x11_connect_display(ssh);
1.67 markus 1571: if (sock < 0)
1572: return NULL;
1.303 djm 1573: c = channel_new(ssh, "x11",
1.67 markus 1574: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1575: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1576: c->force_drain = 1;
1.40 markus 1577: return c;
1578: }
1579:
1.103 deraadt 1580: static Channel *
1.303 djm 1581: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1582: {
1583: Channel *c = NULL;
1.262 djm 1584: int r, sock;
1.40 markus 1585:
1586: if (!options.forward_agent) {
1587: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1588: error("Warning: this is probably a break-in attempt by a "
1589: "malicious server.");
1.40 markus 1590: return NULL;
1591: }
1.330 djm 1592: if (forward_agent_sock_path == NULL) {
1593: r = ssh_get_authentication_socket(&sock);
1594: } else {
1595: r = ssh_get_authentication_socket_path(forward_agent_sock_path, &sock);
1596: }
1597: if (r != 0) {
1.262 djm 1598: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.354 djm 1599: debug_fr(r, "ssh_get_authentication_socket");
1.67 markus 1600: return NULL;
1.262 djm 1601: }
1.372 djm 1602: if ((r = ssh_agent_bind_hostkey(sock, ssh->kex->initial_hostkey,
1603: ssh->kex->session_id, ssh->kex->initial_sig, 1)) == 0)
1604: debug_f("bound agent to hostkey");
1605: else
1606: debug2_fr(r, "ssh_agent_bind_hostkey");
1607:
1.303 djm 1608: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1609: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1610: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1611: "authentication agent connection", 1);
1.82 markus 1612: c->force_drain = 1;
1.40 markus 1613: return c;
1.180 djm 1614: }
1615:
1.306 djm 1616: char *
1.303 djm 1617: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1.343 djm 1618: int local_tun, int remote_tun, channel_open_fn *cb, void *cbctx)
1.180 djm 1619: {
1620: Channel *c;
1.320 djm 1621: int r, fd;
1.306 djm 1622: char *ifname = NULL;
1.180 djm 1623:
1624: if (tun_mode == SSH_TUNMODE_NO)
1625: return 0;
1626:
1627: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1628:
1629: /* Open local tunnel device */
1.306 djm 1630: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1631: error("Tunnel device open failed.");
1.306 djm 1632: return NULL;
1.180 djm 1633: }
1.306 djm 1634: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1635:
1.303 djm 1636: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1637: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1638: c->datagram = 1;
1.343 djm 1639:
1640: if (cb != NULL)
1641: channel_register_open_confirm(ssh, c->self, cb, cbctx);
1.180 djm 1642:
1.320 djm 1643: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1644: (r = sshpkt_put_cstring(ssh, "tun@openssh.com")) != 0 ||
1645: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1646: (r = sshpkt_put_u32(ssh, c->local_window_max)) != 0 ||
1647: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1648: (r = sshpkt_put_u32(ssh, tun_mode)) != 0 ||
1649: (r = sshpkt_put_u32(ssh, remote_tun)) != 0 ||
1650: (r = sshpkt_send(ssh)) != 0)
1.321 djm 1651: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.180 djm 1652:
1.306 djm 1653: return ifname;
1.40 markus 1654: }
1655:
1.22 markus 1656: /* XXXX move to generic input handler */
1.264 markus 1657: static int
1.297 markus 1658: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1659: {
1660: Channel *c = NULL;
1.320 djm 1661: char *ctype = NULL;
1662: int r;
1663: u_int rchan;
1664: size_t len;
1665: u_int rmaxpack, rwindow;
1666:
1667: if ((r = sshpkt_get_cstring(ssh, &ctype, &len)) != 0 ||
1668: (r = sshpkt_get_u32(ssh, &rchan)) != 0 ||
1669: (r = sshpkt_get_u32(ssh, &rwindow)) != 0 ||
1670: (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0)
1671: goto out;
1.22 markus 1672:
1.24 markus 1673: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1674: ctype, rchan, rwindow, rmaxpack);
1675:
1.40 markus 1676: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1677: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1678: rmaxpack);
1.261 millert 1679: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1680: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1681: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1682: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1683: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1684: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1685: }
1.289 markus 1686: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1687: debug3("proxied to downstream: %s", ctype);
1688: } else if (c != NULL) {
1.22 markus 1689: debug("confirm %s", ctype);
1690: c->remote_id = rchan;
1.304 djm 1691: c->have_remote_id = 1;
1.22 markus 1692: c->remote_window = rwindow;
1693: c->remote_maxpacket = rmaxpack;
1.69 markus 1694: if (c->type != SSH_CHANNEL_CONNECTING) {
1.320 djm 1695: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1696: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1697: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1698: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1699: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1700: (r = sshpkt_send(ssh)) != 0)
1701: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.69 markus 1702: }
1.22 markus 1703: } else {
1704: debug("failure %s", ctype);
1.320 djm 1705: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
1706: (r = sshpkt_put_u32(ssh, rchan)) != 0 ||
1707: (r = sshpkt_put_u32(ssh, SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED)) != 0 ||
1708: (r = sshpkt_put_cstring(ssh, "open failed")) != 0 ||
1709: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1710: (r = sshpkt_send(ssh)) != 0)
1711: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.22 markus 1712: }
1.320 djm 1713: r = 0;
1714: out:
1.250 djm 1715: free(ctype);
1.320 djm 1716: return r;
1.22 markus 1717: }
1.267 djm 1718:
1.264 markus 1719: static int
1.297 markus 1720: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1721: {
1722: Channel *c = NULL;
1.320 djm 1723: char *rtype = NULL;
1724: u_char reply;
1725: u_int id, exitval;
1726: int r, success = 0;
1727:
1728: if ((r = sshpkt_get_u32(ssh, &id)) != 0)
1729: return r;
1730: if (id <= INT_MAX)
1731: c = channel_lookup(ssh, id);
1.297 markus 1732: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1733: return 0;
1.320 djm 1734: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
1735: (r = sshpkt_get_u8(ssh, &reply)) != 0)
1736: goto out;
1.48 markus 1737:
1.320 djm 1738: debug("client_input_channel_req: channel %u rtype %s reply %d",
1.48 markus 1739: id, rtype, reply);
1740:
1.320 djm 1741: if (c == NULL) {
1.197 djm 1742: error("client_input_channel_req: channel %d: "
1743: "unknown channel", id);
1.193 markus 1744: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1.320 djm 1745: if ((r = sshpkt_get_end(ssh)) != 0)
1746: goto out;
1.303 djm 1747: chan_rcvd_eow(ssh, c);
1.48 markus 1748: } else if (strcmp(rtype, "exit-status") == 0) {
1.320 djm 1749: if ((r = sshpkt_get_u32(ssh, &exitval)) != 0)
1750: goto out;
1.217 djm 1751: if (c->ctl_chan != -1) {
1.303 djm 1752: mux_exit_message(ssh, c, exitval);
1.215 djm 1753: success = 1;
1.320 djm 1754: } else if ((int)id == session_ident) {
1.215 djm 1755: /* Record exit value of local session */
1.123 djm 1756: success = 1;
1757: exit_status = exitval;
1.215 djm 1758: } else {
1.218 djm 1759: /* Probably for a mux channel that has already closed */
1.354 djm 1760: debug_f("no sink for exit-status on channel %d",
1761: id);
1.123 djm 1762: }
1.320 djm 1763: if ((r = sshpkt_get_end(ssh)) != 0)
1764: goto out;
1.48 markus 1765: }
1.259 djm 1766: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1767: if (!c->have_remote_id)
1.354 djm 1768: fatal_f("channel %d: no remote_id", c->self);
1.320 djm 1769: if ((r = sshpkt_start(ssh, success ?
1770: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE)) != 0 ||
1771: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1772: (r = sshpkt_send(ssh)) != 0)
1773: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.48 markus 1774: }
1.320 djm 1775: r = 0;
1776: out:
1.250 djm 1777: free(rtype);
1.320 djm 1778: return r;
1.48 markus 1779: }
1.267 djm 1780:
1.269 djm 1781: struct hostkeys_update_ctx {
1782: /* The hostname and (optionally) IP address string for the server */
1783: char *host_str, *ip_str;
1784:
1785: /*
1786: * Keys received from the server and a flag for each indicating
1787: * whether they already exist in known_hosts.
1.351 djm 1788: * keys_match is filled in by hostkeys_find() and later (for new
1.269 djm 1789: * keys) by client_global_hostkeys_private_confirm().
1790: */
1791: struct sshkey **keys;
1.351 djm 1792: u_int *keys_match; /* mask of HKF_MATCH_* from hostfile.h */
1793: int *keys_verified; /* flag for new keys verified by server */
1794: size_t nkeys, nnew, nincomplete; /* total, new keys, incomplete match */
1.269 djm 1795:
1796: /*
1797: * Keys that are in known_hosts, but were not present in the update
1798: * from the server (i.e. scheduled to be deleted).
1799: * Filled in by hostkeys_find().
1800: */
1801: struct sshkey **old_keys;
1802: size_t nold;
1.347 djm 1803:
1804: /* Various special cases. */
1.350 djm 1805: int complex_hostspec; /* wildcard or manual pattern-list host name */
1.347 djm 1806: int ca_available; /* saw CA key for this host */
1.352 djm 1807: int old_key_seen; /* saw old key with other name/addr */
1.353 djm 1808: int other_name_seen; /* saw key with other name/addr */
1.269 djm 1809: };
1810:
1811: static void
1812: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1813: {
1814: size_t i;
1815:
1816: if (ctx == NULL)
1817: return;
1818: for (i = 0; i < ctx->nkeys; i++)
1819: sshkey_free(ctx->keys[i]);
1820: free(ctx->keys);
1.351 djm 1821: free(ctx->keys_match);
1822: free(ctx->keys_verified);
1.269 djm 1823: for (i = 0; i < ctx->nold; i++)
1824: sshkey_free(ctx->old_keys[i]);
1825: free(ctx->old_keys);
1826: free(ctx->host_str);
1827: free(ctx->ip_str);
1828: free(ctx);
1829: }
1830:
1.350 djm 1831: /*
1832: * Returns non-zero if a known_hosts hostname list is not of a form that
1833: * can be handled by UpdateHostkeys. These include wildcard hostnames and
1834: * hostnames lists that do not follow the form host[,ip].
1835: */
1836: static int
1837: hostspec_is_complex(const char *hosts)
1838: {
1839: char *cp;
1840:
1841: /* wildcard */
1842: if (strchr(hosts, '*') != NULL || strchr(hosts, '?') != NULL)
1843: return 1;
1844: /* single host/ip = ok */
1845: if ((cp = strchr(hosts, ',')) == NULL)
1846: return 0;
1847: /* more than two entries on the line */
1848: if (strchr(cp + 1, ',') != NULL)
1849: return 1;
1850: /* XXX maybe parse cp+1 and ensure it is an IP? */
1851: return 0;
1852: }
1853:
1.352 djm 1854: /* callback to search for ctx->keys in known_hosts */
1.269 djm 1855: static int
1856: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1857: {
1858: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1859: size_t i;
1860: struct sshkey **tmp;
1861:
1.353 djm 1862: if (l->key == NULL)
1.269 djm 1863: return 0;
1.353 djm 1864: if (l->status != HKF_STATUS_MATCHED) {
1865: /* Record if one of the keys appears on a non-matching line */
1866: for (i = 0; i < ctx->nkeys; i++) {
1867: if (sshkey_equal(l->key, ctx->keys[i])) {
1868: ctx->other_name_seen = 1;
1.354 djm 1869: debug3_f("found %s key under different "
1870: "name/addr at %s:%ld",
1.353 djm 1871: sshkey_ssh_name(ctx->keys[i]),
1872: l->path, l->linenum);
1873: return 0;
1874: }
1875: }
1876: return 0;
1877: }
1878: /* Don't proceed if revocation or CA markers are present */
1879: /* XXX relax this */
1880: if (l->marker != MRK_NONE) {
1.354 djm 1881: debug3_f("hostkeys file %s:%ld has CA/revocation marker",
1882: l->path, l->linenum);
1.353 djm 1883: ctx->complex_hostspec = 1;
1884: return 0;
1885: }
1886:
1.355 djm 1887: /* If CheckHostIP is enabled, then check for mismatched hostname/addr */
1888: if (ctx->ip_str != NULL && strchr(l->hosts, ',') != NULL) {
1889: if ((l->match & HKF_MATCH_HOST) == 0) {
1890: /* Record if address matched a different hostname. */
1891: ctx->other_name_seen = 1;
1892: debug3_f("found address %s against different hostname "
1893: "at %s:%ld", ctx->ip_str, l->path, l->linenum);
1894: return 0;
1895: } else if ((l->match & HKF_MATCH_IP) == 0) {
1896: /* Record if hostname matched a different address. */
1897: ctx->other_name_seen = 1;
1898: debug3_f("found hostname %s against different address "
1899: "at %s:%ld", ctx->host_str, l->path, l->linenum);
1900: }
1.353 djm 1901: }
1.269 djm 1902:
1.350 djm 1903: /*
1904: * UpdateHostkeys is skipped for wildcard host names and hostnames
1905: * that contain more than two entries (ssh never writes these).
1906: */
1907: if (hostspec_is_complex(l->hosts)) {
1.354 djm 1908: debug3_f("hostkeys file %s:%ld complex host specification",
1909: l->path, l->linenum);
1.350 djm 1910: ctx->complex_hostspec = 1;
1.347 djm 1911: return 0;
1912: }
1913:
1.269 djm 1914: /* Mark off keys we've already seen for this host */
1915: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 1916: if (!sshkey_equal(l->key, ctx->keys[i]))
1917: continue;
1.354 djm 1918: debug3_f("found %s key at %s:%ld",
1.351 djm 1919: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1920: ctx->keys_match[i] |= l->match;
1921: return 0;
1.269 djm 1922: }
1923: /* This line contained a key that not offered by the server */
1.354 djm 1924: debug3_f("deprecated %s key at %s:%ld", sshkey_ssh_name(l->key),
1925: l->path, l->linenum);
1.299 deraadt 1926: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1927: sizeof(*ctx->old_keys))) == NULL)
1.354 djm 1928: fatal_f("recallocarray failed nold = %zu", ctx->nold);
1.269 djm 1929: ctx->old_keys = tmp;
1930: ctx->old_keys[ctx->nold++] = l->key;
1931: l->key = NULL;
1932:
1933: return 0;
1934: }
1935:
1.352 djm 1936: /* callback to search for ctx->old_keys in known_hosts under other names */
1937: static int
1938: hostkeys_check_old(struct hostkey_foreach_line *l, void *_ctx)
1939: {
1940: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1941: size_t i;
1942: int hashed;
1943:
1944: /* only care about lines that *don't* match the active host spec */
1945: if (l->status == HKF_STATUS_MATCHED || l->key == NULL)
1946: return 0;
1947:
1948: hashed = l->match & (HKF_MATCH_HOST_HASHED|HKF_MATCH_IP_HASHED);
1949: for (i = 0; i < ctx->nold; i++) {
1950: if (!sshkey_equal(l->key, ctx->old_keys[i]))
1951: continue;
1.354 djm 1952: debug3_f("found deprecated %s key at %s:%ld as %s",
1.364 djm 1953: sshkey_ssh_name(ctx->old_keys[i]), l->path, l->linenum,
1.352 djm 1954: hashed ? "[HASHED]" : l->hosts);
1955: ctx->old_key_seen = 1;
1956: break;
1957: }
1958: return 0;
1959: }
1960:
1961: /*
1962: * Check known_hosts files for deprecated keys under other names. Returns 0
1963: * on success or -1 on failure. Updates ctx->old_key_seen if deprecated keys
1964: * exist under names other than the active hostname/IP.
1965: */
1966: static int
1967: check_old_keys_othernames(struct hostkeys_update_ctx *ctx)
1968: {
1969: size_t i;
1970: int r;
1971:
1.354 djm 1972: debug2_f("checking for %zu deprecated keys", ctx->nold);
1.352 djm 1973: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 1974: debug3_f("searching %s for %s / %s",
1.352 djm 1975: options.user_hostfiles[i], ctx->host_str,
1976: ctx->ip_str ? ctx->ip_str : "(none)");
1977: if ((r = hostkeys_foreach(options.user_hostfiles[i],
1978: hostkeys_check_old, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 1979: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.352 djm 1980: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 1981: debug_f("hostkeys file %s does not exist",
1982: options.user_hostfiles[i]);
1.352 djm 1983: continue;
1984: }
1.354 djm 1985: error_fr(r, "hostkeys_foreach failed for %s",
1986: options.user_hostfiles[i]);
1.352 djm 1987: return -1;
1988: }
1989: }
1990: return 0;
1991: }
1992:
1.269 djm 1993: static void
1.337 djm 1994: hostkey_change_preamble(LogLevel loglevel)
1.269 djm 1995: {
1.336 djm 1996: do_log2(loglevel, "The server has updated its host keys.");
1997: do_log2(loglevel, "These changes were verified by the server's "
1998: "existing trusted key.");
1999: }
2000:
2001: static void
2002: update_known_hosts(struct hostkeys_update_ctx *ctx)
2003: {
2004: int r, was_raw = 0, first = 1;
2005: int asking = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK;
2006: LogLevel loglevel = asking ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1.269 djm 2007: char *fp, *response;
2008: size_t i;
1.333 djm 2009: struct stat sb;
1.269 djm 2010:
2011: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2012: if (!ctx->keys_verified[i])
1.269 djm 2013: continue;
2014: if ((fp = sshkey_fingerprint(ctx->keys[i],
2015: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2016: fatal_f("sshkey_fingerprint failed");
1.336 djm 2017: if (first && asking)
1.337 djm 2018: hostkey_change_preamble(loglevel);
1.269 djm 2019: do_log2(loglevel, "Learned new hostkey: %s %s",
2020: sshkey_type(ctx->keys[i]), fp);
1.336 djm 2021: first = 0;
1.269 djm 2022: free(fp);
2023: }
2024: for (i = 0; i < ctx->nold; i++) {
2025: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2026: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2027: fatal_f("sshkey_fingerprint failed");
1.336 djm 2028: if (first && asking)
1.337 djm 2029: hostkey_change_preamble(loglevel);
1.269 djm 2030: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2031: sshkey_type(ctx->old_keys[i]), fp);
1.336 djm 2032: first = 0;
1.269 djm 2033: free(fp);
2034: }
2035: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2036: if (get_saved_tio() != NULL) {
2037: leave_raw_mode(1);
2038: was_raw = 1;
2039: }
1.269 djm 2040: response = NULL;
2041: for (i = 0; !quit_pending && i < 3; i++) {
2042: free(response);
2043: response = read_passphrase("Accept updated hostkeys? "
2044: "(yes/no): ", RP_ECHO);
2045: if (strcasecmp(response, "yes") == 0)
2046: break;
2047: else if (quit_pending || response == NULL ||
2048: strcasecmp(response, "no") == 0) {
2049: options.update_hostkeys = 0;
2050: break;
2051: } else {
2052: do_log2(loglevel, "Please enter "
2053: "\"yes\" or \"no\"");
2054: }
2055: }
2056: if (quit_pending || i >= 3 || response == NULL)
2057: options.update_hostkeys = 0;
2058: free(response);
1.271 djm 2059: if (was_raw)
2060: enter_raw_mode(1);
1.269 djm 2061: }
1.333 djm 2062: if (options.update_hostkeys == 0)
2063: return;
1.269 djm 2064: /*
2065: * Now that all the keys are verified, we can go ahead and replace
2066: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2067: * cancel the operation).
2068: */
1.333 djm 2069: for (i = 0; i < options.num_user_hostfiles; i++) {
2070: /*
2071: * NB. keys are only added to hostfiles[0], for the rest we
2072: * just delete the hostname entries.
2073: */
2074: if (stat(options.user_hostfiles[i], &sb) != 0) {
2075: if (errno == ENOENT) {
1.354 djm 2076: debug_f("known hosts file %s does not "
2077: "exist", options.user_hostfiles[i]);
1.333 djm 2078: } else {
1.354 djm 2079: error_f("known hosts file %s "
2080: "inaccessible: %s",
2081: options.user_hostfiles[i], strerror(errno));
1.333 djm 2082: }
2083: continue;
2084: }
2085: if ((r = hostfile_replace_entries(options.user_hostfiles[i],
2086: ctx->host_str, ctx->ip_str,
2087: i == 0 ? ctx->keys : NULL, i == 0 ? ctx->nkeys : 0,
2088: options.hash_known_hosts, 0,
2089: options.fingerprint_hash)) != 0) {
1.354 djm 2090: error_fr(r, "hostfile_replace_entries failed for %s",
2091: options.user_hostfiles[i]);
1.333 djm 2092: }
2093: }
1.269 djm 2094: }
2095:
2096: static void
1.303 djm 2097: client_global_hostkeys_private_confirm(struct ssh *ssh, int type,
2098: u_int32_t seq, void *_ctx)
1.269 djm 2099: {
2100: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2101: size_t i, ndone;
2102: struct sshbuf *signdata;
1.375 ! djm 2103: int r, plaintype;
1.269 djm 2104: const u_char *sig;
1.375 ! djm 2105: const char *rsa_kexalg = NULL;
! 2106: char *alg = NULL;
1.269 djm 2107: size_t siglen;
2108:
2109: if (ctx->nnew == 0)
1.354 djm 2110: fatal_f("ctx->nnew == 0"); /* sanity */
1.269 djm 2111: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2112: error("Server failed to confirm ownership of "
2113: "private host keys");
2114: hostkeys_update_ctx_free(ctx);
2115: return;
2116: }
1.375 ! djm 2117: if (sshkey_type_plain(sshkey_type_from_name(
! 2118: ssh->kex->hostkey_alg)) == KEY_RSA)
! 2119: rsa_kexalg = ssh->kex->hostkey_alg;
1.269 djm 2120: if ((signdata = sshbuf_new()) == NULL)
1.354 djm 2121: fatal_f("sshbuf_new failed");
1.269 djm 2122: /*
2123: * Expect a signature for each of the ctx->nnew private keys we
2124: * haven't seen before. They will be in the same order as the
1.351 djm 2125: * ctx->keys where the corresponding ctx->keys_match[i] == 0.
1.269 djm 2126: */
2127: for (ndone = i = 0; i < ctx->nkeys; i++) {
1.351 djm 2128: if (ctx->keys_match[i])
1.269 djm 2129: continue;
1.375 ! djm 2130: plaintype = sshkey_type_plain(ctx->keys[i]->type);
1.269 djm 2131: /* Prepare data to be signed: session ID, unique string, key */
2132: sshbuf_reset(signdata);
1.270 djm 2133: if ( (r = sshbuf_put_cstring(signdata,
2134: "hostkeys-prove-00@openssh.com")) != 0 ||
1.358 djm 2135: (r = sshbuf_put_stringb(signdata,
2136: ssh->kex->session_id)) != 0 ||
1.269 djm 2137: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1.354 djm 2138: fatal_fr(r, "compose signdata");
1.269 djm 2139: /* Extract and verify signature */
2140: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1.354 djm 2141: error_fr(r, "parse sig");
1.269 djm 2142: goto out;
2143: }
1.375 ! djm 2144: if ((r = sshkey_get_sigtype(sig, siglen, &alg)) != 0) {
! 2145: error_fr(r, "server gave unintelligible signature "
! 2146: "for %s key %zu", sshkey_type(ctx->keys[i]), i);
! 2147: goto out;
! 2148: }
1.309 djm 2149: /*
1.375 ! djm 2150: * Special case for RSA keys: if a RSA hostkey was negotiated,
! 2151: * then use its signature type for verification of RSA hostkey
! 2152: * proofs. Otherwise, accept only RSA-SHA256/512 signatures.
1.309 djm 2153: */
1.375 ! djm 2154: if (plaintype == KEY_RSA && rsa_kexalg == NULL &&
! 2155: match_pattern_list(alg, HOSTKEY_PROOF_RSA_ALGS, 0) != 1) {
! 2156: debug_f("server used untrusted RSA signature algorithm "
! 2157: "%s for key %zu, disregarding", alg, i);
! 2158: free(alg);
! 2159: /* zap the key from the list */
! 2160: sshkey_free(ctx->keys[i]);
! 2161: ctx->keys[i] = NULL;
! 2162: ndone++;
! 2163: continue;
! 2164: }
! 2165: debug3_f("verify %s key %zu using sigalg %s",
! 2166: sshkey_type(ctx->keys[i]), i, alg);
! 2167: free(alg);
1.269 djm 2168: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 2169: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.375 ! djm 2170: plaintype == KEY_RSA ? rsa_kexalg : NULL, 0, NULL)) != 0) {
1.361 djm 2171: error_fr(r, "server gave bad signature for %s key %zu",
1.354 djm 2172: sshkey_type(ctx->keys[i]), i);
1.269 djm 2173: goto out;
2174: }
2175: /* Key is good. Mark it as 'seen' */
1.351 djm 2176: ctx->keys_verified[i] = 1;
1.269 djm 2177: ndone++;
2178: }
1.354 djm 2179: /* Shouldn't happen */
1.269 djm 2180: if (ndone != ctx->nnew)
1.354 djm 2181: fatal_f("ndone != ctx->nnew (%zu / %zu)", ndone, ctx->nnew);
1.320 djm 2182: if ((r = sshpkt_get_end(ssh)) != 0) {
1.354 djm 2183: error_f("protocol error");
1.320 djm 2184: goto out;
2185: }
1.269 djm 2186:
2187: /* Make the edits to known_hosts */
2188: update_known_hosts(ctx);
2189: out:
2190: hostkeys_update_ctx_free(ctx);
2191: }
2192:
1.267 djm 2193: /*
1.291 djm 2194: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
2195: * Made slightly less trivial by the multiple RSA signature algorithm names.
2196: */
2197: static int
2198: key_accepted_by_hostkeyalgs(const struct sshkey *key)
2199: {
2200: const char *ktype = sshkey_ssh_name(key);
1.331 dtucker 2201: const char *hostkeyalgs = options.hostkeyalgorithms;
1.291 djm 2202:
2203: if (key == NULL || key->type == KEY_UNSPEC)
2204: return 0;
2205: if (key->type == KEY_RSA &&
2206: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
2207: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
2208: return 1;
2209: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
2210: }
2211:
2212: /*
1.270 djm 2213: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2214: * the server's hostkeys. The keys are checked against the user's
2215: * HostkeyAlgorithms preference before they are accepted.
2216: */
2217: static int
1.321 djm 2218: client_input_hostkeys(struct ssh *ssh)
1.267 djm 2219: {
2220: const u_char *blob = NULL;
1.269 djm 2221: size_t i, len = 0;
1.267 djm 2222: struct sshbuf *buf = NULL;
1.269 djm 2223: struct sshkey *key = NULL, **tmp;
2224: int r;
2225: char *fp;
1.267 djm 2226: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2227: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2228: struct hostkeys_update_ctx *ctx = NULL;
1.351 djm 2229: u_int want;
1.267 djm 2230:
2231: if (hostkeys_seen)
1.354 djm 2232: fatal_f("server already sent hostkeys");
1.269 djm 2233: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2234: options.batch_mode)
2235: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2236: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2237: return 1;
1.272 djm 2238:
2239: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2240: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2241: sshkey_free(key);
2242: key = NULL;
1.269 djm 2243: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
1.354 djm 2244: error_fr(r, "parse key");
1.269 djm 2245: goto out;
2246: }
1.270 djm 2247: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
1.354 djm 2248: do_log2_fr(r, r == SSH_ERR_KEY_TYPE_UNKNOWN ?
1.335 djm 2249: SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR,
1.354 djm 2250: "convert key");
1.335 djm 2251: continue;
1.270 djm 2252: }
1.267 djm 2253: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2254: SSH_FP_DEFAULT);
1.354 djm 2255: debug3_f("received %s key %s", sshkey_type(key), fp);
1.267 djm 2256: free(fp);
1.275 markus 2257:
1.291 djm 2258: if (!key_accepted_by_hostkeyalgs(key)) {
1.354 djm 2259: debug3_f("%s key not permitted by "
2260: "HostkeyAlgorithms", sshkey_ssh_name(key));
1.267 djm 2261: continue;
2262: }
1.269 djm 2263: /* Skip certs */
2264: if (sshkey_is_cert(key)) {
1.354 djm 2265: debug3_f("%s key is a certificate; skipping",
2266: sshkey_ssh_name(key));
1.269 djm 2267: continue;
2268: }
2269: /* Ensure keys are unique */
2270: for (i = 0; i < ctx->nkeys; i++) {
2271: if (sshkey_equal(key, ctx->keys[i])) {
1.354 djm 2272: error_f("received duplicated %s host key",
2273: sshkey_ssh_name(key));
1.269 djm 2274: goto out;
2275: }
2276: }
2277: /* Key is good, record it */
1.299 deraadt 2278: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2279: sizeof(*ctx->keys))) == NULL)
1.354 djm 2280: fatal_f("recallocarray failed nkeys = %zu",
2281: ctx->nkeys);
1.269 djm 2282: ctx->keys = tmp;
2283: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2284: key = NULL;
2285: }
2286:
1.269 djm 2287: if (ctx->nkeys == 0) {
1.354 djm 2288: debug_f("server sent no hostkeys");
1.267 djm 2289: goto out;
2290: }
1.270 djm 2291:
1.351 djm 2292: if ((ctx->keys_match = calloc(ctx->nkeys,
2293: sizeof(*ctx->keys_match))) == NULL ||
2294: (ctx->keys_verified = calloc(ctx->nkeys,
2295: sizeof(*ctx->keys_verified))) == NULL)
1.354 djm 2296: fatal_f("calloc failed");
1.267 djm 2297:
1.268 djm 2298: get_hostfile_hostname_ipaddr(host,
2299: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2300: options.port, &ctx->host_str,
2301: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2302:
1.269 djm 2303: /* Find which keys we already know about. */
1.333 djm 2304: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2305: debug_f("searching %s for %s / %s",
1.339 dtucker 2306: options.user_hostfiles[i], ctx->host_str,
1.340 dtucker 2307: ctx->ip_str ? ctx->ip_str : "(none)");
1.333 djm 2308: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2309: hostkeys_find, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2310: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.333 djm 2311: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2312: debug_f("hostkeys file %s does not exist",
2313: options.user_hostfiles[i]);
1.333 djm 2314: continue;
2315: }
1.354 djm 2316: error_fr(r, "hostkeys_foreach failed for %s",
2317: options.user_hostfiles[i]);
1.333 djm 2318: goto out;
2319: }
1.267 djm 2320: }
2321:
1.269 djm 2322: /* Figure out if we have any new keys to add */
1.351 djm 2323: ctx->nnew = ctx->nincomplete = 0;
2324: want = HKF_MATCH_HOST | ( options.check_host_ip ? HKF_MATCH_IP : 0);
1.269 djm 2325: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2326: if (ctx->keys_match[i] == 0)
1.269 djm 2327: ctx->nnew++;
1.351 djm 2328: if ((ctx->keys_match[i] & want) != want)
2329: ctx->nincomplete++;
1.269 djm 2330: }
2331:
1.354 djm 2332: debug3_f("%zu server keys: %zu new, %zu retained, "
2333: "%zu incomplete match. %zu to remove", ctx->nkeys, ctx->nnew,
2334: ctx->nkeys - ctx->nnew - ctx->nincomplete,
1.351 djm 2335: ctx->nincomplete, ctx->nold);
1.269 djm 2336:
1.353 djm 2337: if (ctx->nnew == 0 && ctx->nold == 0) {
1.354 djm 2338: debug_f("no new or deprecated keys from server");
1.353 djm 2339: goto out;
2340: }
2341:
2342: /* Various reasons why we cannot proceed with the update */
2343: if (ctx->complex_hostspec) {
1.354 djm 2344: debug_f("CA/revocation marker, manual host list or wildcard "
2345: "host pattern found, skipping UserKnownHostsFile update");
1.353 djm 2346: goto out;
2347: }
2348: if (ctx->other_name_seen) {
1.354 djm 2349: debug_f("host key found matching a different name/address, "
2350: "skipping UserKnownHostsFile update");
1.347 djm 2351: goto out;
1.352 djm 2352: }
2353: /*
2354: * If removing keys, check whether they appear under different
2355: * names/addresses and refuse to proceed if they do. This avoids
2356: * cases such as hosts with multiple names becoming inconsistent
2357: * with regards to CheckHostIP entries.
2358: * XXX UpdateHostkeys=force to override this (and other) checks?
2359: */
2360: if (ctx->nold != 0) {
2361: if (check_old_keys_othernames(ctx) != 0)
2362: goto out; /* error already logged */
2363: if (ctx->old_key_seen) {
1.354 djm 2364: debug_f("key(s) for %s%s%s exist under other names; "
2365: "skipping UserKnownHostsFile update",
1.352 djm 2366: ctx->host_str, ctx->ip_str == NULL ? "" : ",",
2367: ctx->ip_str == NULL ? "" : ctx->ip_str);
2368: goto out;
2369: }
2370: }
2371:
1.353 djm 2372: if (ctx->nnew == 0) {
1.351 djm 2373: /*
2374: * We have some keys to remove or fix matching for.
2375: * We can proceed to do this without requiring a fresh proof
2376: * from the server.
2377: */
1.269 djm 2378: update_known_hosts(ctx);
1.353 djm 2379: goto out;
2380: }
2381: /*
2382: * We have received previously-unseen keys from the server.
2383: * Ask the server to confirm ownership of the private halves.
2384: */
1.354 djm 2385: debug3_f("asking server to prove ownership for %zu keys", ctx->nnew);
1.353 djm 2386: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2387: (r = sshpkt_put_cstring(ssh,
2388: "hostkeys-prove-00@openssh.com")) != 0 ||
2389: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
1.354 djm 2390: fatal_fr(r, "prepare hostkeys-prove");
1.353 djm 2391: if ((buf = sshbuf_new()) == NULL)
1.354 djm 2392: fatal_f("sshbuf_new");
1.353 djm 2393: for (i = 0; i < ctx->nkeys; i++) {
2394: if (ctx->keys_match[i])
2395: continue;
2396: sshbuf_reset(buf);
2397: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0 ||
1.354 djm 2398: (r = sshpkt_put_stringb(ssh, buf)) != 0)
2399: fatal_fr(r, "assemble hostkeys-prove");
1.269 djm 2400: }
1.353 djm 2401: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2402: fatal_fr(r, "send hostkeys-prove");
1.353 djm 2403: client_register_global_confirm(
2404: client_global_hostkeys_private_confirm, ctx);
2405: ctx = NULL; /* will be freed in callback */
1.269 djm 2406:
1.267 djm 2407: /* Success */
2408: out:
1.269 djm 2409: hostkeys_update_ctx_free(ctx);
1.267 djm 2410: sshkey_free(key);
2411: sshbuf_free(buf);
1.269 djm 2412: /*
2413: * NB. Return success for all cases. The server doesn't need to know
2414: * what the client does with its hosts file.
2415: */
2416: return 1;
1.267 djm 2417: }
2418:
1.264 markus 2419: static int
1.297 markus 2420: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2421: {
2422: char *rtype;
1.320 djm 2423: u_char want_reply;
2424: int r, success = 0;
1.95 markus 2425:
1.320 djm 2426: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
2427: (r = sshpkt_get_u8(ssh, &want_reply)) != 0)
2428: goto out;
1.117 markus 2429: debug("client_input_global_request: rtype %s want_reply %d",
2430: rtype, want_reply);
1.270 djm 2431: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.321 djm 2432: success = client_input_hostkeys(ssh);
1.95 markus 2433: if (want_reply) {
1.320 djm 2434: if ((r = sshpkt_start(ssh, success ? SSH2_MSG_REQUEST_SUCCESS :
2435: SSH2_MSG_REQUEST_FAILURE)) != 0 ||
2436: (r = sshpkt_send(ssh)) != 0 ||
2437: (r = ssh_packet_write_wait(ssh)) != 0)
2438: goto out;
1.95 markus 2439: }
1.320 djm 2440: r = 0;
2441: out:
1.250 djm 2442: free(rtype);
1.320 djm 2443: return r;
1.95 markus 2444: }
1.22 markus 2445:
1.354 djm 2446: static void
2447: client_send_env(struct ssh *ssh, int id, const char *name, const char *val)
2448: {
2449: int r;
2450:
2451: debug("channel %d: setting env %s = \"%s\"", id, name, val);
2452: channel_request_start(ssh, id, "env", 0);
2453: if ((r = sshpkt_put_cstring(ssh, name)) != 0 ||
2454: (r = sshpkt_put_cstring(ssh, val)) != 0 ||
2455: (r = sshpkt_send(ssh)) != 0)
2456: fatal_fr(r, "send setenv");
2457: }
2458:
1.123 djm 2459: void
1.303 djm 2460: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.315 markus 2461: const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd,
2462: char **env)
1.123 djm 2463: {
1.320 djm 2464: int i, j, matched, len, r;
1.313 djm 2465: char *name, *val;
1.132 djm 2466: Channel *c = NULL;
1.123 djm 2467:
1.354 djm 2468: debug2_f("id %d", id);
1.123 djm 2469:
1.303 djm 2470: if ((c = channel_lookup(ssh, id)) == NULL)
1.354 djm 2471: fatal_f("channel %d: unknown channel", id);
1.224 djm 2472:
1.320 djm 2473: ssh_packet_set_interactive(ssh, want_tty,
1.224 djm 2474: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2475:
1.123 djm 2476: if (want_tty) {
2477: struct winsize ws;
2478:
2479: /* Store window size in the packet. */
1.326 deraadt 2480: if (ioctl(in_fd, TIOCGWINSZ, &ws) == -1)
1.123 djm 2481: memset(&ws, 0, sizeof(ws));
2482:
1.303 djm 2483: channel_request_start(ssh, id, "pty-req", 1);
2484: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.320 djm 2485: if ((r = sshpkt_put_cstring(ssh, term != NULL ? term : ""))
2486: != 0 ||
2487: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
2488: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
2489: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
2490: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0)
1.354 djm 2491: fatal_fr(r, "build pty-req");
1.194 djm 2492: if (tiop == NULL)
2493: tiop = get_saved_tio();
1.316 markus 2494: ssh_tty_make_modes(ssh, -1, tiop);
1.320 djm 2495: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2496: fatal_fr(r, "send pty-req");
1.123 djm 2497: /* XXX wait for reply */
1.132 djm 2498: c->client_tty = 1;
1.123 djm 2499: }
2500:
2501: /* Transfer any environment variables from client to server */
1.126 djm 2502: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2503: debug("Sending environment.");
1.126 djm 2504: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2505: /* Split */
1.126 djm 2506: name = xstrdup(env[i]);
1.123 djm 2507: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2508: free(name);
1.123 djm 2509: continue;
2510: }
2511: *val++ = '\0';
2512:
2513: matched = 0;
2514: for (j = 0; j < options.num_send_env; j++) {
2515: if (match_pattern(name, options.send_env[j])) {
2516: matched = 1;
2517: break;
2518: }
2519: }
2520: if (!matched) {
2521: debug3("Ignored env %s", name);
1.250 djm 2522: free(name);
1.123 djm 2523: continue;
2524: }
1.354 djm 2525: client_send_env(ssh, id, name, val);
1.250 djm 2526: free(name);
1.123 djm 2527: }
1.313 djm 2528: }
2529: for (i = 0; i < options.num_setenv; i++) {
2530: /* Split */
2531: name = xstrdup(options.setenv[i]);
2532: if ((val = strchr(name, '=')) == NULL) {
2533: free(name);
2534: continue;
2535: }
2536: *val++ = '\0';
1.354 djm 2537: client_send_env(ssh, id, name, val);
1.313 djm 2538: free(name);
1.123 djm 2539: }
2540:
1.315 markus 2541: len = sshbuf_len(cmd);
1.123 djm 2542: if (len > 0) {
2543: if (len > 900)
2544: len = 900;
2545: if (want_subsystem) {
1.190 djm 2546: debug("Sending subsystem: %.*s",
1.315 markus 2547: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2548: channel_request_start(ssh, id, "subsystem", 1);
2549: client_expect_confirm(ssh, id, "subsystem",
2550: CONFIRM_CLOSE);
1.123 djm 2551: } else {
1.190 djm 2552: debug("Sending command: %.*s",
1.315 markus 2553: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2554: channel_request_start(ssh, id, "exec", 1);
2555: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2556: }
1.320 djm 2557: if ((r = sshpkt_put_stringb(ssh, cmd)) != 0 ||
2558: (r = sshpkt_send(ssh)) != 0)
1.354 djm 2559: fatal_fr(r, "send command");
1.123 djm 2560: } else {
1.303 djm 2561: channel_request_start(ssh, id, "shell", 1);
2562: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.354 djm 2563: if ((r = sshpkt_send(ssh)) != 0)
2564: fatal_fr(r, "send shell");
1.123 djm 2565: }
2566: }
2567:
1.77 itojun 2568: static void
1.321 djm 2569: client_init_dispatch(struct ssh *ssh)
1.16 markus 2570: {
1.321 djm 2571: ssh_dispatch_init(ssh, &dispatch_protocol_error);
1.100 markus 2572:
1.321 djm 2573: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2574: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2575: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2576: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2577: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2578: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2579: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2580: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2581: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2582: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2583: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2584: ssh_dispatch_set(ssh, SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2585:
2586: /* rekeying */
1.321 djm 2587: ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2588:
2589: /* global request reply messages */
1.321 djm 2590: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2591: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2592: }
2593:
2594: void
2595: client_stop_mux(void)
2596: {
2597: if (options.control_path != NULL && muxserver_sock != -1)
2598: unlink(options.control_path);
2599: /*
1.247 dtucker 2600: * If we are in persist mode, or don't have a shell, signal that we
2601: * should close when all active channels are closed.
1.232 djm 2602: */
1.366 djm 2603: if (options.control_persist || options.session_type == SESSION_TYPE_NONE) {
1.232 djm 2604: session_closed = 1;
1.235 djm 2605: setproctitle("[stopped mux]");
2606: }
1.113 markus 2607: }
2608:
2609: /* client specific fatal cleanup */
2610: void
1.114 markus 2611: cleanup_exit(int i)
1.113 markus 2612: {
1.233 djm 2613: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.192 djm 2614: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2615: unlink(options.control_path);
1.223 djm 2616: ssh_kill_proxy_command();
1.114 markus 2617: _exit(i);
1.1 deraadt 2618: }
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