Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.310
1.310 ! djm 1: /* $OpenBSD: clientloop.c,v 1.309 2017/12/18 23:16:23 djm Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.189 djm 68: #include <sys/queue.h>
1.150 stevesk 69:
1.155 stevesk 70: #include <ctype.h>
1.168 stevesk 71: #include <errno.h>
1.151 stevesk 72: #include <paths.h>
1.153 stevesk 73: #include <signal.h>
1.174 stevesk 74: #include <stdio.h>
1.173 stevesk 75: #include <stdlib.h>
1.170 stevesk 76: #include <string.h>
1.150 stevesk 77: #include <termios.h>
1.175 deraadt 78: #include <pwd.h>
1.169 stevesk 79: #include <unistd.h>
1.266 deraadt 80: #include <limits.h>
1.1 deraadt 81:
1.175 deraadt 82: #include "xmalloc.h"
1.45 markus 83: #include "ssh.h"
84: #include "ssh2.h"
1.1 deraadt 85: #include "packet.h"
86: #include "buffer.h"
1.15 markus 87: #include "compat.h"
1.74 markus 88: #include "channels.h"
1.15 markus 89: #include "dispatch.h"
1.40 markus 90: #include "key.h"
1.175 deraadt 91: #include "cipher.h"
1.54 markus 92: #include "kex.h"
1.275 markus 93: #include "myproposal.h"
1.45 markus 94: #include "log.h"
1.261 millert 95: #include "misc.h"
1.45 markus 96: #include "readconf.h"
97: #include "clientloop.h"
1.147 djm 98: #include "sshconnect.h"
1.40 markus 99: #include "authfd.h"
1.45 markus 100: #include "atomicio.h"
1.118 deraadt 101: #include "sshpty.h"
1.123 djm 102: #include "match.h"
103: #include "msg.h"
1.262 djm 104: #include "ssherr.h"
1.267 djm 105: #include "hostfile.h"
1.39 markus 106:
107: /* import options */
108: extern Options options;
109:
1.1 deraadt 110: /* Flag indicating that stdin should be redirected from /dev/null. */
111: extern int stdin_null_flag;
112:
1.116 dtucker 113: /* Flag indicating that no shell has been requested */
114: extern int no_shell_flag;
115:
1.286 djm 116: /* Flag indicating that ssh should daemonise after authentication is complete */
117: extern int fork_after_authentication_flag;
118:
1.123 djm 119: /* Control socket */
1.217 djm 120: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 121:
1.13 markus 122: /*
123: * Name of the host we are connecting to. This is the name given on the
124: * command line, or the HostName specified for the user-supplied name in a
125: * configuration file.
126: */
1.1 deraadt 127: extern char *host;
128:
1.13 markus 129: /*
130: * Flag to indicate that we have received a window change signal which has
131: * not yet been processed. This will cause a message indicating the new
132: * window size to be sent to the server a little later. This is volatile
133: * because this is updated in a signal handler.
134: */
1.88 markus 135: static volatile sig_atomic_t received_window_change_signal = 0;
136: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 137:
1.145 djm 138: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 139: static int in_non_blocking_mode = 0;
140:
1.222 djm 141: /* Time when backgrounded control master using ControlPersist should exit */
142: static time_t control_persist_exit_time = 0;
143:
1.1 deraadt 144: /* Common data for the client loop code. */
1.217 djm 145: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.11 markus 146: static int last_was_cr; /* Last character was a newline. */
1.197 djm 147: static int exit_status; /* Used to store the command exit status. */
1.294 djm 148: static Buffer stderr_buffer; /* Used for final exit message. */
1.11 markus 149: static int connection_in; /* Connection to server (input). */
150: static int connection_out; /* Connection to server (output). */
1.56 markus 151: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 152: static int session_closed; /* In SSH2: login session closed. */
1.274 djm 153: static u_int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.1 deraadt 154:
1.77 itojun 155: static void client_init_dispatch(void);
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:
1.123 djm 183: void ssh_process_session2_setup(int, int, int, Buffer *);
184:
1.1 deraadt 185: /* Restores stdin to blocking mode. */
186:
1.77 itojun 187: static void
1.49 itojun 188: leave_non_blocking(void)
1.1 deraadt 189: {
1.11 markus 190: if (in_non_blocking_mode) {
1.125 djm 191: unset_nonblock(fileno(stdin));
1.11 markus 192: in_non_blocking_mode = 0;
193: }
1.1 deraadt 194: }
195:
1.13 markus 196: /*
197: * Signal handler for the window change signal (SIGWINCH). This just sets a
198: * flag indicating that the window has changed.
199: */
1.157 deraadt 200: /*ARGSUSED */
1.77 itojun 201: static void
1.11 markus 202: window_change_handler(int sig)
1.1 deraadt 203: {
1.11 markus 204: received_window_change_signal = 1;
205: signal(SIGWINCH, window_change_handler);
1.1 deraadt 206: }
207:
1.13 markus 208: /*
209: * Signal handler for signals that cause the program to terminate. These
210: * signals must be trapped to restore terminal modes.
211: */
1.157 deraadt 212: /*ARGSUSED */
1.77 itojun 213: static void
1.11 markus 214: signal_handler(int sig)
1.1 deraadt 215: {
1.75 markus 216: received_signal = sig;
217: quit_pending = 1;
1.1 deraadt 218: }
219:
1.13 markus 220: /*
1.222 djm 221: * Sets control_persist_exit_time to the absolute time when the
222: * backgrounded control master should exit due to expiry of the
223: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
224: * control master process, or if there is no ControlPersist timeout.
225: */
226: static void
1.303 djm 227: set_control_persist_exit_time(struct ssh *ssh)
1.222 djm 228: {
229: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 230: || options.control_persist_timeout == 0) {
1.222 djm 231: /* not using a ControlPersist timeout */
232: control_persist_exit_time = 0;
1.303 djm 233: } else if (channel_still_open(ssh)) {
1.222 djm 234: /* some client connections are still open */
235: if (control_persist_exit_time > 0)
236: debug2("%s: cancel scheduled exit", __func__);
237: control_persist_exit_time = 0;
238: } else if (control_persist_exit_time <= 0) {
239: /* a client connection has recently closed */
1.251 dtucker 240: control_persist_exit_time = monotime() +
1.222 djm 241: (time_t)options.control_persist_timeout;
242: debug2("%s: schedule exit in %d seconds", __func__,
243: options.control_persist_timeout);
244: }
245: /* else we are already counting down to the timeout */
246: }
247:
1.238 dtucker 248: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
249: static int
250: client_x11_display_valid(const char *display)
251: {
252: size_t i, dlen;
253:
1.279 djm 254: if (display == NULL)
255: return 0;
256:
1.238 dtucker 257: dlen = strlen(display);
258: for (i = 0; i < dlen; i++) {
1.256 deraadt 259: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 260: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
261: debug("Invalid character '%c' in DISPLAY", display[i]);
262: return 0;
263: }
264: }
265: return 1;
266: }
267:
1.274 djm 268: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
269: #define X11_TIMEOUT_SLACK 60
1.279 djm 270: int
1.303 djm 271: client_x11_get_proto(struct ssh *ssh, const char *display,
272: const char *xauth_path, u_int trusted, u_int timeout,
273: char **_proto, char **_data)
1.138 djm 274: {
1.279 djm 275: char cmd[1024], line[512], xdisplay[512];
276: char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
1.138 djm 277: static char proto[512], data[512];
278: FILE *f;
1.288 tedu 279: int got_data = 0, generated = 0, do_unlink = 0, r;
1.138 djm 280: struct stat st;
1.274 djm 281: u_int now, x11_timeout_real;
1.138 djm 282:
283: *_proto = proto;
284: *_data = data;
1.279 djm 285: proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
1.138 djm 286:
1.279 djm 287: if (!client_x11_display_valid(display)) {
1.283 millert 288: if (display != NULL)
289: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
290: display);
1.279 djm 291: return -1;
292: }
293: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
1.138 djm 294: debug("No xauth program.");
1.279 djm 295: xauth_path = NULL;
296: }
297:
298: if (xauth_path != NULL) {
1.138 djm 299: /*
300: * Handle FamilyLocal case where $DISPLAY does
301: * not match an authorization entry. For this we
302: * just try "xauth list unix:displaynum.screennum".
303: * XXX: "localhost" match to determine FamilyLocal
304: * is not perfect.
305: */
306: if (strncmp(display, "localhost:", 10) == 0) {
1.279 djm 307: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
308: display + 10)) < 0 ||
309: (size_t)r >= sizeof(xdisplay)) {
310: error("%s: display name too long", __func__);
311: return -1;
312: }
1.138 djm 313: display = xdisplay;
314: }
315: if (trusted == 0) {
1.274 djm 316: /*
1.279 djm 317: * Generate an untrusted X11 auth cookie.
318: *
1.274 djm 319: * The authentication cookie should briefly outlive
320: * ssh's willingness to forward X11 connections to
321: * avoid nasty fail-open behaviour in the X server.
322: */
1.279 djm 323: mktemp_proto(xauthdir, sizeof(xauthdir));
324: if (mkdtemp(xauthdir) == NULL) {
325: error("%s: mkdtemp: %s",
326: __func__, strerror(errno));
327: return -1;
328: }
329: do_unlink = 1;
330: if ((r = snprintf(xauthfile, sizeof(xauthfile),
331: "%s/xauthfile", xauthdir)) < 0 ||
332: (size_t)r >= sizeof(xauthfile)) {
333: error("%s: xauthfile path too long", __func__);
334: unlink(xauthfile);
335: rmdir(xauthdir);
336: return -1;
337: }
338:
1.274 djm 339: if (timeout >= UINT_MAX - X11_TIMEOUT_SLACK)
340: x11_timeout_real = UINT_MAX;
341: else
342: x11_timeout_real = timeout + X11_TIMEOUT_SLACK;
1.279 djm 343: if ((r = snprintf(cmd, sizeof(cmd),
344: "%s -f %s generate %s " SSH_X11_PROTO
345: " untrusted timeout %u 2>" _PATH_DEVNULL,
346: xauth_path, xauthfile, display,
347: x11_timeout_real)) < 0 ||
348: (size_t)r >= sizeof(cmd))
349: fatal("%s: cmd too long", __func__);
350: debug2("%s: %s", __func__, cmd);
351: if (x11_refuse_time == 0) {
352: now = monotime() + 1;
353: if (UINT_MAX - timeout < now)
354: x11_refuse_time = UINT_MAX;
355: else
356: x11_refuse_time = now + timeout;
1.303 djm 357: channel_set_x11_refuse_time(ssh,
358: x11_refuse_time);
1.138 djm 359: }
1.279 djm 360: if (system(cmd) == 0)
361: generated = 1;
1.138 djm 362: }
1.181 markus 363:
364: /*
365: * When in untrusted mode, we read the cookie only if it was
366: * successfully generated as an untrusted one in the step
367: * above.
368: */
369: if (trusted || generated) {
370: snprintf(cmd, sizeof(cmd),
371: "%s %s%s list %s 2>" _PATH_DEVNULL,
372: xauth_path,
373: generated ? "-f " : "" ,
374: generated ? xauthfile : "",
375: display);
376: debug2("x11_get_proto: %s", cmd);
377: f = popen(cmd, "r");
378: if (f && fgets(line, sizeof(line), f) &&
379: sscanf(line, "%*s %511s %511s", proto, data) == 2)
380: got_data = 1;
381: if (f)
382: pclose(f);
1.279 djm 383: }
1.138 djm 384: }
385:
386: if (do_unlink) {
387: unlink(xauthfile);
388: rmdir(xauthdir);
389: }
390:
1.279 djm 391: /* Don't fall back to fake X11 data for untrusted forwarding */
392: if (!trusted && !got_data) {
393: error("Warning: untrusted X11 forwarding setup failed: "
394: "xauth key data not generated");
395: return -1;
396: }
397:
1.138 djm 398: /*
399: * If we didn't get authentication data, just make up some
400: * data. The forwarding code will check the validity of the
401: * response anyway, and substitute this data. The X11
402: * server, however, will ignore this fake data and use
403: * whatever authentication mechanisms it was using otherwise
404: * for the local connection.
405: */
406: if (!got_data) {
1.288 tedu 407: u_int8_t rnd[16];
408: u_int i;
1.138 djm 409:
410: logit("Warning: No xauth data; "
411: "using fake authentication data for X11 forwarding.");
412: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.288 tedu 413: arc4random_buf(rnd, sizeof(rnd));
414: for (i = 0; i < sizeof(rnd); i++) {
1.138 djm 415: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.288 tedu 416: rnd[i]);
1.138 djm 417: }
418: }
1.279 djm 419:
420: return 0;
1.1 deraadt 421: }
422:
1.13 markus 423: /*
424: * Checks if the client window has changed, and sends a packet about it to
425: * the server if so. The actual change is detected elsewhere (by a software
426: * interrupt on Unix); this just checks the flag and sends a message if
427: * appropriate.
428: */
1.1 deraadt 429:
1.77 itojun 430: static void
1.303 djm 431: client_check_window_change(struct ssh *ssh)
1.1 deraadt 432: {
1.292 djm 433: if (!received_window_change_signal)
1.16 markus 434: return;
435: /** XXX race */
436: received_window_change_signal = 0;
437:
1.292 djm 438: debug2("%s: changed", __func__);
1.16 markus 439:
1.303 djm 440: channel_send_window_changes(ssh);
1.1 deraadt 441: }
442:
1.264 markus 443: static int
1.297 markus 444: client_global_request_reply(int type, u_int32_t seq, struct ssh *ssh)
1.117 markus 445: {
1.196 djm 446: struct global_confirm *gc;
447:
448: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 449: return 0;
1.196 djm 450: if (gc->cb != NULL)
1.303 djm 451: gc->cb(ssh, type, seq, gc->ctx);
1.196 djm 452: if (--gc->ref_count <= 0) {
453: TAILQ_REMOVE(&global_confirms, gc, entry);
1.257 tedu 454: explicit_bzero(gc, sizeof(*gc));
1.250 djm 455: free(gc);
1.196 djm 456: }
457:
1.210 andreas 458: packet_set_alive_timeouts(0);
1.264 markus 459: return 0;
1.117 markus 460: }
461:
462: static void
463: server_alive_check(void)
464: {
1.210 andreas 465: if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
1.228 djm 466: logit("Timeout, server %s not responding.", host);
1.176 markus 467: cleanup_exit(255);
468: }
1.117 markus 469: packet_start(SSH2_MSG_GLOBAL_REQUEST);
470: packet_put_cstring("keepalive@openssh.com");
471: packet_put_char(1); /* boolean: want reply */
472: packet_send();
1.196 djm 473: /* Insert an empty placeholder to maintain ordering */
474: client_register_global_confirm(NULL, NULL);
1.117 markus 475: }
476:
1.13 markus 477: /*
478: * Waits until the client can do something (some data becomes available on
479: * one of the file descriptors).
480: */
1.77 itojun 481: static void
1.303 djm 482: client_wait_until_can_do_something(struct ssh *ssh,
483: fd_set **readsetp, fd_set **writesetp,
1.130 avsm 484: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 485: {
1.117 markus 486: struct timeval tv, *tvp;
1.222 djm 487: int timeout_secs;
1.251 dtucker 488: time_t minwait_secs = 0, server_alive_time = 0, now = monotime();
1.117 markus 489: int ret;
490:
1.46 markus 491: /* Add any selections by the channel mechanism. */
1.302 djm 492: channel_prepare_select(active_state, readsetp, writesetp, maxfdp,
493: nallocp, &minwait_secs);
1.11 markus 494:
1.292 djm 495: /* channel_prepare_select could have closed the last channel */
1.303 djm 496: if (session_closed && !channel_still_open(ssh) &&
1.292 djm 497: !packet_have_data_to_write()) {
498: /* clear mask since we did not call select() */
499: memset(*readsetp, 0, *nallocp);
500: memset(*writesetp, 0, *nallocp);
501: return;
1.16 markus 502: }
1.11 markus 503:
1.294 djm 504: FD_SET(connection_in, *readsetp);
505:
1.11 markus 506: /* Select server connection if have data to write to the server. */
507: if (packet_have_data_to_write())
1.46 markus 508: FD_SET(connection_out, *writesetp);
1.11 markus 509:
1.13 markus 510: /*
511: * Wait for something to happen. This will suspend the process until
512: * some selected descriptor can be read, written, or has some other
1.222 djm 513: * event pending, or a timeout expires.
1.13 markus 514: */
1.11 markus 515:
1.222 djm 516: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.292 djm 517: if (options.server_alive_interval > 0) {
1.222 djm 518: timeout_secs = options.server_alive_interval;
1.249 dtucker 519: server_alive_time = now + options.server_alive_interval;
520: }
1.292 djm 521: if (options.rekey_interval > 0 && !rekeying)
1.287 deraadt 522: timeout_secs = MINIMUM(timeout_secs, packet_get_rekey_timeout());
1.303 djm 523: set_control_persist_exit_time(ssh);
1.222 djm 524: if (control_persist_exit_time > 0) {
1.287 deraadt 525: timeout_secs = MINIMUM(timeout_secs,
1.249 dtucker 526: control_persist_exit_time - now);
1.222 djm 527: if (timeout_secs < 0)
528: timeout_secs = 0;
529: }
1.239 djm 530: if (minwait_secs != 0)
1.287 deraadt 531: timeout_secs = MINIMUM(timeout_secs, (int)minwait_secs);
1.222 djm 532: if (timeout_secs == INT_MAX)
1.117 markus 533: tvp = NULL;
1.129 deraadt 534: else {
1.222 djm 535: tv.tv_sec = timeout_secs;
1.117 markus 536: tv.tv_usec = 0;
537: tvp = &tv;
538: }
1.222 djm 539:
1.117 markus 540: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
541: if (ret < 0) {
1.11 markus 542: char buf[100];
1.51 markus 543:
544: /*
545: * We have to clear the select masks, because we return.
546: * We have to return, because the mainloop checks for the flags
547: * set by the signal handlers.
548: */
1.87 markus 549: memset(*readsetp, 0, *nallocp);
550: memset(*writesetp, 0, *nallocp);
1.50 deraadt 551:
1.11 markus 552: if (errno == EINTR)
553: return;
554: /* Note: we might still have data in the buffers. */
555: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
556: buffer_append(&stderr_buffer, buf, strlen(buf));
557: quit_pending = 1;
1.249 dtucker 558: } else if (ret == 0) {
559: /*
560: * Timeout. Could have been either keepalive or rekeying.
561: * Keepalive we check here, rekeying is checked in clientloop.
562: */
1.251 dtucker 563: if (server_alive_time != 0 && server_alive_time <= monotime())
1.249 dtucker 564: server_alive_check();
565: }
566:
1.11 markus 567: }
568:
1.77 itojun 569: static void
1.31 markus 570: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 571: {
1.11 markus 572: /* Flush stdout and stderr buffers. */
1.31 markus 573: if (buffer_len(bout) > 0)
1.197 djm 574: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
575: buffer_len(bout));
1.31 markus 576: if (buffer_len(berr) > 0)
1.197 djm 577: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
578: buffer_len(berr));
1.11 markus 579:
1.233 djm 580: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 581:
1.305 djm 582: sshbuf_reset(bin);
583: sshbuf_reset(bout);
584: sshbuf_reset(berr);
1.11 markus 585:
586: /* Send the suspend signal to the program itself. */
587: kill(getpid(), SIGTSTP);
588:
1.132 djm 589: /* Reset window sizes in case they have changed */
590: received_window_change_signal = 1;
1.11 markus 591:
1.233 djm 592: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 593: }
594:
1.77 itojun 595: static void
1.161 deraadt 596: client_process_net_input(fd_set *readset)
1.11 markus 597: {
1.280 markus 598: int len;
1.17 markus 599: char buf[8192];
1.11 markus 600:
1.13 markus 601: /*
602: * Read input from the server, and add any such data to the buffer of
603: * the packet subsystem.
604: */
1.11 markus 605: if (FD_ISSET(connection_in, readset)) {
606: /* Read as much as possible. */
1.280 markus 607: len = read(connection_in, buf, sizeof(buf));
608: if (len == 0) {
1.197 djm 609: /*
610: * Received EOF. The remote host has closed the
611: * connection.
612: */
613: snprintf(buf, sizeof buf,
614: "Connection to %.300s closed by remote host.\r\n",
615: host);
1.1 deraadt 616: buffer_append(&stderr_buffer, buf, strlen(buf));
617: quit_pending = 1;
618: return;
1.11 markus 619: }
1.13 markus 620: /*
621: * There is a kernel bug on Solaris that causes select to
622: * sometimes wake up even though there is no data available.
623: */
1.53 millert 624: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 625: len = 0;
626:
627: if (len < 0) {
1.197 djm 628: /*
629: * An error has encountered. Perhaps there is a
630: * network problem.
631: */
632: snprintf(buf, sizeof buf,
633: "Read from remote host %.300s: %.100s\r\n",
634: host, strerror(errno));
1.11 markus 635: buffer_append(&stderr_buffer, buf, strlen(buf));
636: quit_pending = 1;
637: return;
638: }
639: packet_process_incoming(buf, len);
640: }
1.17 markus 641: }
1.16 markus 642:
1.97 jakob 643: static void
1.303 djm 644: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 645: {
1.190 djm 646: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
647: char errmsg[256];
648: int tochan;
649:
1.234 djm 650: /*
651: * If a TTY was explicitly requested, then a failure to allocate
652: * one is fatal.
653: */
654: if (cr->action == CONFIRM_TTY &&
655: (options.request_tty == REQUEST_TTY_FORCE ||
656: options.request_tty == REQUEST_TTY_YES))
657: cr->action = CONFIRM_CLOSE;
658:
1.190 djm 659: /* XXX supress on mux _client_ quietmode */
660: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 661: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 662:
663: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
664: debug2("%s request accepted on channel %d",
665: cr->request_type, c->self);
666: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
667: if (tochan) {
668: snprintf(errmsg, sizeof(errmsg),
669: "%s request failed\r\n", cr->request_type);
670: } else {
671: snprintf(errmsg, sizeof(errmsg),
672: "%s request failed on channel %d",
673: cr->request_type, c->self);
674: }
675: /* If error occurred on primary session channel, then exit */
1.234 djm 676: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 677: fatal("%s", errmsg);
1.234 djm 678: /*
679: * If error occurred on mux client, append to
680: * their stderr.
681: */
682: if (tochan) {
1.303 djm 683: buffer_append(c->extended, errmsg, strlen(errmsg));
1.234 djm 684: } else
1.190 djm 685: error("%s", errmsg);
1.234 djm 686: if (cr->action == CONFIRM_TTY) {
687: /*
688: * If a TTY allocation error occurred, then arrange
689: * for the correct TTY to leave raw mode.
690: */
691: if (c->self == session_ident)
692: leave_raw_mode(0);
693: else
1.303 djm 694: mux_tty_alloc_failed(ssh, c);
1.234 djm 695: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 696: chan_read_failed(ssh, c);
697: chan_write_failed(ssh, c);
1.190 djm 698: }
699: }
1.250 djm 700: free(cr);
1.190 djm 701: }
702:
703: static void
1.303 djm 704: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 705: {
1.250 djm 706: free(ctx);
1.190 djm 707: }
1.129 deraadt 708:
1.236 djm 709: void
1.303 djm 710: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 711: enum confirm_action action)
1.190 djm 712: {
1.255 djm 713: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 714:
1.190 djm 715: cr->request_type = request;
1.234 djm 716: cr->action = action;
1.123 djm 717:
1.303 djm 718: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 719: client_abandon_status_confirm, cr);
1.196 djm 720: }
721:
722: void
723: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
724: {
1.201 djm 725: struct global_confirm *gc, *last_gc;
1.196 djm 726:
727: /* Coalesce identical callbacks */
1.201 djm 728: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
729: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
730: if (++last_gc->ref_count >= INT_MAX)
731: fatal("%s: last_gc->ref_count = %d",
732: __func__, last_gc->ref_count);
1.196 djm 733: return;
734: }
735:
1.255 djm 736: gc = xcalloc(1, sizeof(*gc));
1.196 djm 737: gc->cb = cb;
738: gc->ctx = ctx;
739: gc->ref_count = 1;
740: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 741: }
742:
743: static void
1.303 djm 744: process_cmdline(struct ssh *ssh)
1.97 jakob 745: {
746: void (*handler)(int);
1.261 millert 747: char *s, *cmd;
748: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
749: struct Forward fwd;
1.97 jakob 750:
1.257 tedu 751: memset(&fwd, 0, sizeof(fwd));
1.183 djm 752:
1.233 djm 753: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 754: handler = signal(SIGINT, SIG_IGN);
1.99 markus 755: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 756: if (s == NULL)
757: goto out;
1.256 deraadt 758: while (isspace((u_char)*s))
1.97 jakob 759: s++;
1.121 djm 760: if (*s == '-')
761: s++; /* Skip cmdline '-', if any */
1.120 dtucker 762: if (*s == '\0')
1.97 jakob 763: goto out;
1.121 djm 764:
1.122 djm 765: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 766: logit("Commands:");
1.164 djm 767: logit(" -L[bind_address:]port:host:hostport "
768: "Request local forward");
769: logit(" -R[bind_address:]port:host:hostport "
770: "Request remote forward");
1.204 stevesk 771: logit(" -D[bind_address:]port "
772: "Request dynamic forward");
1.237 markus 773: logit(" -KL[bind_address:]port "
774: "Cancel local forward");
1.165 stevesk 775: logit(" -KR[bind_address:]port "
1.164 djm 776: "Cancel remote forward");
1.237 markus 777: logit(" -KD[bind_address:]port "
778: "Cancel dynamic forward");
1.146 reyk 779: if (!options.permit_local_command)
780: goto out;
1.164 djm 781: logit(" !args "
782: "Execute local command");
1.146 reyk 783: goto out;
784: }
785:
786: if (*s == '!' && options.permit_local_command) {
787: s++;
788: ssh_local_cmd(s);
1.121 djm 789: goto out;
790: }
791:
792: if (*s == 'K') {
793: delete = 1;
794: s++;
795: }
1.204 stevesk 796: if (*s == 'L')
797: local = 1;
798: else if (*s == 'R')
799: remote = 1;
800: else if (*s == 'D')
801: dynamic = 1;
802: else {
1.109 itojun 803: logit("Invalid command.");
1.97 jakob 804: goto out;
805: }
1.204 stevesk 806:
1.256 deraadt 807: while (isspace((u_char)*++s))
1.179 tedu 808: ;
1.97 jakob 809:
1.217 djm 810: /* XXX update list of forwards in options */
1.121 djm 811: if (delete) {
1.261 millert 812: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
813: if (!parse_forward(&fwd, s, 1, 0)) {
814: logit("Bad forwarding close specification.");
1.121 djm 815: goto out;
816: }
1.237 markus 817: if (remote)
1.303 djm 818: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 819: else if (dynamic)
1.303 djm 820: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 821: 0, &options.fwd_opts) > 0;
1.237 markus 822: else
1.303 djm 823: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 824: CHANNEL_CANCEL_PORT_STATIC,
825: &options.fwd_opts) > 0;
1.237 markus 826: if (!ok) {
1.290 dtucker 827: logit("Unknown port forwarding.");
1.237 markus 828: goto out;
829: }
830: logit("Canceled forwarding.");
1.121 djm 831: } else {
1.209 djm 832: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 833: logit("Bad forwarding specification.");
834: goto out;
835: }
1.204 stevesk 836: if (local || dynamic) {
1.303 djm 837: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 838: &options.fwd_opts)) {
1.121 djm 839: logit("Port forwarding failed.");
840: goto out;
841: }
1.135 djm 842: } else {
1.303 djm 843: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 844: logit("Port forwarding failed.");
845: goto out;
846: }
1.135 djm 847: }
1.121 djm 848: logit("Forwarding port.");
849: }
850:
1.97 jakob 851: out:
852: signal(SIGINT, handler);
1.233 djm 853: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 854: free(cmd);
855: free(fwd.listen_host);
1.261 millert 856: free(fwd.listen_path);
1.250 djm 857: free(fwd.connect_host);
1.261 millert 858: free(fwd.connect_path);
1.97 jakob 859: }
860:
1.244 dtucker 861: /* reasons to suppress output of an escape command in help output */
862: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 863: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
864: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
865: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.244 dtucker 866: struct escape_help_text {
867: const char *cmd;
868: const char *text;
869: unsigned int flags;
870: };
871: static struct escape_help_text esc_txt[] = {
872: {".", "terminate session", SUPPRESS_MUXMASTER},
873: {".", "terminate connection (and any multiplexed sessions)",
874: SUPPRESS_MUXCLIENT},
1.292 djm 875: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.244 dtucker 876: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1.292 djm 877: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 878: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 879: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
880: {"#", "list forwarded connections", SUPPRESS_NEVER},
881: {"&", "background ssh (when waiting for connections to terminate)",
882: SUPPRESS_MUXCLIENT},
883: {"?", "this message", SUPPRESS_NEVER},
884: };
885:
886: static void
1.292 djm 887: print_escape_help(Buffer *b, int escape_char, int mux_client, int using_stderr)
1.244 dtucker 888: {
889: unsigned int i, suppress_flags;
890: char string[1024];
891:
892: snprintf(string, sizeof string, "%c?\r\n"
893: "Supported escape sequences:\r\n", escape_char);
894: buffer_append(b, string, strlen(string));
895:
1.292 djm 896: suppress_flags =
1.244 dtucker 897: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
898: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
899: (using_stderr ? 0 : SUPPRESS_SYSLOG);
900:
901: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
902: if (esc_txt[i].flags & suppress_flags)
903: continue;
1.246 dtucker 904: snprintf(string, sizeof string, " %c%-3s - %s\r\n",
1.244 dtucker 905: escape_char, esc_txt[i].cmd, esc_txt[i].text);
906: buffer_append(b, string, strlen(string));
907: }
908:
909: snprintf(string, sizeof string,
1.246 dtucker 910: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 911: "(Note that escapes are only recognized immediately after "
912: "newline.)\r\n", escape_char, escape_char);
913: buffer_append(b, string, strlen(string));
914: }
915:
1.195 djm 916: /*
1.296 naddy 917: * Process the characters one by one.
1.195 djm 918: */
1.77 itojun 919: static int
1.303 djm 920: process_escapes(struct ssh *ssh, Channel *c,
921: Buffer *bin, Buffer *bout, Buffer *berr,
1.195 djm 922: char *buf, int len)
1.31 markus 923: {
1.32 markus 924: char string[1024];
1.31 markus 925: pid_t pid;
926: int bytes = 0;
1.42 markus 927: u_int i;
928: u_char ch;
1.31 markus 929: char *s;
1.294 djm 930: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
931: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 932:
1.294 djm 933: if (c->filter_ctx == NULL)
934: return 0;
1.195 djm 935:
1.139 djm 936: if (len <= 0)
937: return (0);
938:
939: for (i = 0; i < (u_int)len; i++) {
1.31 markus 940: /* Get one character at a time. */
941: ch = buf[i];
942:
1.294 djm 943: if (efc->escape_pending) {
1.31 markus 944: /* We have previously seen an escape character. */
945: /* Clear the flag now. */
1.294 djm 946: efc->escape_pending = 0;
1.31 markus 947:
948: /* Process the escaped character. */
949: switch (ch) {
950: case '.':
951: /* Terminate the connection. */
1.195 djm 952: snprintf(string, sizeof string, "%c.\r\n",
1.294 djm 953: efc->escape_char);
1.32 markus 954: buffer_append(berr, string, strlen(string));
1.31 markus 955:
1.217 djm 956: if (c && c->ctl_chan != -1) {
1.303 djm 957: chan_read_failed(ssh, c);
958: chan_write_failed(ssh, c);
959: if (c->detach_user) {
960: c->detach_user(ssh,
961: c->self, NULL);
962: }
1.253 dtucker 963: c->type = SSH_CHANNEL_ABANDONED;
1.303 djm 964: buffer_clear(c->input);
965: chan_ibuf_empty(ssh, c);
1.195 djm 966: return 0;
967: } else
968: quit_pending = 1;
1.31 markus 969: return -1;
970:
971: case 'Z' - 64:
1.195 djm 972: /* XXX support this for mux clients */
1.217 djm 973: if (c && c->ctl_chan != -1) {
1.245 dtucker 974: char b[16];
1.195 djm 975: noescape:
1.245 dtucker 976: if (ch == 'Z' - 64)
977: snprintf(b, sizeof b, "^Z");
978: else
979: snprintf(b, sizeof b, "%c", ch);
1.195 djm 980: snprintf(string, sizeof string,
1.245 dtucker 981: "%c%s escape not available to "
1.195 djm 982: "multiplexed sessions\r\n",
1.294 djm 983: efc->escape_char, b);
1.195 djm 984: buffer_append(berr, string,
985: strlen(string));
986: continue;
987: }
1.197 djm 988: /* Suspend the program. Inform the user */
1.195 djm 989: snprintf(string, sizeof string,
1.294 djm 990: "%c^Z [suspend ssh]\r\n", efc->escape_char);
1.32 markus 991: buffer_append(berr, string, strlen(string));
1.31 markus 992:
993: /* Restore terminal modes and suspend. */
994: client_suspend_self(bin, bout, berr);
995:
996: /* We have been continued. */
997: continue;
998:
1.111 markus 999: case 'B':
1.292 djm 1000: snprintf(string, sizeof string,
1.294 djm 1001: "%cB\r\n", efc->escape_char);
1.292 djm 1002: buffer_append(berr, string, strlen(string));
1.303 djm 1003: channel_request_start(ssh, c->self, "break", 0);
1.292 djm 1004: packet_put_int(1000);
1005: packet_send();
1.111 markus 1006: continue;
1007:
1.54 markus 1008: case 'R':
1.292 djm 1009: if (datafellows & SSH_BUG_NOREKEY)
1010: logit("Server does not "
1011: "support re-keying");
1012: else
1013: need_rekeying = 1;
1.54 markus 1014: continue;
1015:
1.242 dtucker 1016: case 'V':
1017: /* FALLTHROUGH */
1018: case 'v':
1019: if (c && c->ctl_chan != -1)
1020: goto noescape;
1021: if (!log_is_on_stderr()) {
1022: snprintf(string, sizeof string,
1023: "%c%c [Logging to syslog]\r\n",
1.294 djm 1024: efc->escape_char, ch);
1.242 dtucker 1025: buffer_append(berr, string,
1026: strlen(string));
1027: continue;
1028: }
1029: if (ch == 'V' && options.log_level >
1030: SYSLOG_LEVEL_QUIET)
1031: log_change_level(--options.log_level);
1032: if (ch == 'v' && options.log_level <
1033: SYSLOG_LEVEL_DEBUG3)
1034: log_change_level(++options.log_level);
1035: snprintf(string, sizeof string,
1.294 djm 1036: "%c%c [LogLevel %s]\r\n",
1037: efc->escape_char, ch,
1.242 dtucker 1038: log_level_name(options.log_level));
1039: buffer_append(berr, string, strlen(string));
1040: continue;
1041:
1.31 markus 1042: case '&':
1.217 djm 1043: if (c && c->ctl_chan != -1)
1.195 djm 1044: goto noescape;
1.31 markus 1045: /*
1.197 djm 1046: * Detach the program (continue to serve
1047: * connections, but put in background and no
1048: * more new connections).
1.31 markus 1049: */
1050: /* Restore tty modes. */
1.233 djm 1051: leave_raw_mode(
1052: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1053:
1054: /* Stop listening for new connections. */
1.303 djm 1055: channel_stop_listening(ssh);
1.31 markus 1056:
1.86 markus 1057: snprintf(string, sizeof string,
1.294 djm 1058: "%c& [backgrounded]\n", efc->escape_char);
1.86 markus 1059: buffer_append(berr, string, strlen(string));
1.31 markus 1060:
1061: /* Fork into background. */
1062: pid = fork();
1063: if (pid < 0) {
1064: error("fork: %.100s", strerror(errno));
1065: continue;
1066: }
1067: if (pid != 0) { /* This is the parent. */
1068: /* The parent just exits. */
1069: exit(0);
1070: }
1071: /* The child continues serving connections. */
1.292 djm 1072: buffer_append(bin, "\004", 1);
1073: /* fake EOF on stdin */
1074: return -1;
1.31 markus 1075: case '?':
1.294 djm 1076: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1077: (c && c->ctl_chan != -1),
1078: log_is_on_stderr());
1.31 markus 1079: continue;
1080:
1081: case '#':
1.195 djm 1082: snprintf(string, sizeof string, "%c#\r\n",
1.294 djm 1083: efc->escape_char);
1.32 markus 1084: buffer_append(berr, string, strlen(string));
1.303 djm 1085: s = channel_open_message(ssh);
1.31 markus 1086: buffer_append(berr, s, strlen(s));
1.250 djm 1087: free(s);
1.97 jakob 1088: continue;
1089:
1090: case 'C':
1.217 djm 1091: if (c && c->ctl_chan != -1)
1.206 djm 1092: goto noescape;
1.303 djm 1093: process_cmdline(ssh);
1.31 markus 1094: continue;
1095:
1096: default:
1.294 djm 1097: if (ch != efc->escape_char) {
1098: buffer_put_char(bin, efc->escape_char);
1.31 markus 1099: bytes++;
1100: }
1101: /* Escaped characters fall through here */
1102: break;
1103: }
1104: } else {
1105: /*
1.197 djm 1106: * The previous character was not an escape char.
1107: * Check if this is an escape.
1.31 markus 1108: */
1.294 djm 1109: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1110: /*
1111: * It is. Set the flag and continue to
1112: * next character.
1113: */
1.294 djm 1114: efc->escape_pending = 1;
1.31 markus 1115: continue;
1116: }
1117: }
1118:
1119: /*
1120: * Normal character. Record whether it was a newline,
1121: * and append it to the buffer.
1122: */
1123: last_was_cr = (ch == '\r' || ch == '\n');
1124: buffer_put_char(bin, ch);
1125: bytes++;
1126: }
1127: return bytes;
1128: }
1129:
1.13 markus 1130: /*
1.15 markus 1131: * Get packets from the connection input buffer, and process them as long as
1132: * there are packets available.
1133: *
1134: * Any unknown packets received during the actual
1135: * session cause the session to terminate. This is
1136: * intended to make debugging easier since no
1137: * confirmations are sent. Any compatible protocol
1138: * extensions must be negotiated during the
1139: * preparatory phase.
1140: */
1141:
1.77 itojun 1142: static void
1.49 itojun 1143: client_process_buffered_input_packets(void)
1.15 markus 1144: {
1.298 markus 1145: ssh_dispatch_run_fatal(active_state, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1146: }
1147:
1.31 markus 1148: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1149:
1.195 djm 1150: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1151: void *
1152: client_new_escape_filter_ctx(int escape_char)
1153: {
1154: struct escape_filter_ctx *ret;
1155:
1.255 djm 1156: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1157: ret->escape_pending = 0;
1158: ret->escape_char = escape_char;
1159: return (void *)ret;
1160: }
1161:
1.198 djm 1162: /* Free the escape filter context on channel free */
1163: void
1.303 djm 1164: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1165: {
1.250 djm 1166: free(ctx);
1.198 djm 1167: }
1168:
1.195 djm 1169: int
1.303 djm 1170: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1171: {
1.190 djm 1172: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1173: return 0;
1174:
1.303 djm 1175: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1176: buf, len);
1.30 markus 1177: }
1178:
1.77 itojun 1179: static void
1.303 djm 1180: client_channel_closed(struct ssh *ssh, int id, void *arg)
1.60 markus 1181: {
1.303 djm 1182: channel_cancel_cleanup(ssh, id);
1.60 markus 1183: session_closed = 1;
1.233 djm 1184: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1185: }
1186:
1.15 markus 1187: /*
1.13 markus 1188: * Implements the interactive session with the server. This is called after
1189: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1190: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1191: * used as an escape character for terminating or suspending the session.
1.13 markus 1192: */
1.20 markus 1193: int
1.303 djm 1194: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1195: int ssh2_chan_id)
1.1 deraadt 1196: {
1.46 markus 1197: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1198: double start_time, total_time;
1.284 djm 1199: int r, max_fd = 0, max_fd2 = 0, len;
1.200 markus 1200: u_int64_t ibytes, obytes;
1.130 avsm 1201: u_int nalloc = 0;
1.11 markus 1202: char buf[100];
1203:
1204: debug("Entering interactive session.");
1.277 semarie 1205:
1.278 semarie 1206: if (options.control_master &&
1.286 djm 1207: !option_clear_or_none(options.control_path)) {
1.278 semarie 1208: debug("pledge: id");
1.285 tb 1209: if (pledge("stdio rpath wpath cpath unix inet dns recvfd proc exec id tty",
1.278 semarie 1210: NULL) == -1)
1211: fatal("%s pledge(): %s", __func__, strerror(errno));
1212:
1213: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1214: debug("pledge: exec");
1215: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1216: NULL) == -1)
1217: fatal("%s pledge(): %s", __func__, strerror(errno));
1218:
1219: } else if (options.update_hostkeys) {
1220: debug("pledge: filesystem full");
1221: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1222: NULL) == -1)
1223: fatal("%s pledge(): %s", __func__, strerror(errno));
1224:
1.286 djm 1225: } else if (!option_clear_or_none(options.proxy_command) ||
1226: fork_after_authentication_flag) {
1.277 semarie 1227: debug("pledge: proc");
1228: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1229: fatal("%s pledge(): %s", __func__, strerror(errno));
1230:
1231: } else {
1232: debug("pledge: network");
1.300 mestre 1233: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.277 semarie 1234: fatal("%s pledge(): %s", __func__, strerror(errno));
1235: }
1.11 markus 1236:
1.307 dtucker 1237: start_time = monotime_double();
1.11 markus 1238:
1239: /* Initialize variables. */
1240: last_was_cr = 1;
1241: exit_status = -1;
1242: connection_in = packet_get_connection_in();
1243: connection_out = packet_get_connection_out();
1.287 deraadt 1244: max_fd = MAXIMUM(connection_in, connection_out);
1.46 markus 1245:
1.11 markus 1246: quit_pending = 0;
1247:
1248: /* Initialize buffers. */
1249: buffer_init(&stderr_buffer);
1250:
1.15 markus 1251: client_init_dispatch();
1252:
1.105 markus 1253: /*
1254: * Set signal handlers, (e.g. to restore non-blocking mode)
1255: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1256: */
1.131 djm 1257: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1258: signal(SIGHUP, signal_handler);
1.105 markus 1259: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1260: signal(SIGINT, signal_handler);
1261: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1262: signal(SIGQUIT, signal_handler);
1263: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1264: signal(SIGTERM, signal_handler);
1.132 djm 1265: signal(SIGWINCH, window_change_handler);
1.11 markus 1266:
1267: if (have_pty)
1.233 djm 1268: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1269:
1.292 djm 1270: session_ident = ssh2_chan_id;
1271: if (session_ident != -1) {
1272: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1273: channel_register_filter(ssh, session_ident,
1.292 djm 1274: client_simple_escape_filter, NULL,
1275: client_filter_cleanup,
1276: client_new_escape_filter_ctx(
1277: escape_char_arg));
1.232 djm 1278: }
1.303 djm 1279: channel_register_cleanup(ssh, session_ident,
1.292 djm 1280: client_channel_closed, 0);
1.48 markus 1281: }
1.30 markus 1282:
1.11 markus 1283: /* Main loop of the client for the interactive session mode. */
1284: while (!quit_pending) {
1285:
1.13 markus 1286: /* Process buffered packets sent by the server. */
1.11 markus 1287: client_process_buffered_input_packets();
1288:
1.303 djm 1289: if (session_closed && !channel_still_open(ssh))
1.60 markus 1290: break;
1291:
1.303 djm 1292: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1293: debug("rekeying in progress");
1.284 djm 1294: } else if (need_rekeying) {
1295: /* manual rekey request */
1296: debug("need rekeying");
1.303 djm 1297: if ((r = kex_start_rekex(ssh)) != 0)
1.284 djm 1298: fatal("%s: kex_start_rekex: %s", __func__,
1299: ssh_err(r));
1300: need_rekeying = 0;
1.56 markus 1301: } else {
1302: /*
1303: * Make packets from buffered channel data, and
1304: * enqueue them for sending to the server.
1305: */
1306: if (packet_not_very_much_data_to_write())
1.303 djm 1307: channel_output_poll(ssh);
1.11 markus 1308:
1.56 markus 1309: /*
1310: * Check if the window size has changed, and buffer a
1311: * message about it to the server if so.
1312: */
1.303 djm 1313: client_check_window_change(ssh);
1.11 markus 1314:
1.56 markus 1315: if (quit_pending)
1316: break;
1317: }
1.13 markus 1318: /*
1319: * Wait until we have something to do (something becomes
1320: * available on one of the descriptors).
1321: */
1.81 markus 1322: max_fd2 = max_fd;
1.303 djm 1323: client_wait_until_can_do_something(ssh, &readset, &writeset,
1324: &max_fd2, &nalloc, ssh_packet_is_rekeying(ssh));
1.11 markus 1325:
1326: if (quit_pending)
1327: break;
1328:
1.56 markus 1329: /* Do channel operations unless rekeying in progress. */
1.303 djm 1330: if (!ssh_packet_is_rekeying(ssh))
1331: channel_after_select(ssh, readset, writeset);
1.11 markus 1332:
1.17 markus 1333: /* Buffer input from the connection. */
1.46 markus 1334: client_process_net_input(readset);
1.17 markus 1335:
1336: if (quit_pending)
1337: break;
1.11 markus 1338:
1.197 djm 1339: /*
1340: * Send as much buffered packet data as possible to the
1341: * sender.
1342: */
1.46 markus 1343: if (FD_ISSET(connection_out, writeset))
1.11 markus 1344: packet_write_poll();
1.222 djm 1345:
1346: /*
1347: * If we are a backgrounded control master, and the
1348: * timeout has expired without any active client
1349: * connections, then quit.
1350: */
1351: if (control_persist_exit_time > 0) {
1.251 dtucker 1352: if (monotime() >= control_persist_exit_time) {
1.222 djm 1353: debug("ControlPersist timeout expired");
1354: break;
1355: }
1356: }
1.11 markus 1357: }
1.250 djm 1358: free(readset);
1359: free(writeset);
1.11 markus 1360:
1361: /* Terminate the session. */
1362:
1363: /* Stop watching for window change. */
1.132 djm 1364: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1365:
1.292 djm 1366: packet_start(SSH2_MSG_DISCONNECT);
1367: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1368: packet_put_cstring("disconnected by user");
1369: packet_put_cstring(""); /* language tag */
1370: packet_send();
1371: packet_write_wait();
1.11 markus 1372:
1.303 djm 1373: channel_free_all(ssh);
1.11 markus 1374:
1.75 markus 1375: if (have_pty)
1.233 djm 1376: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1377:
1378: /* restore blocking io */
1379: if (!isatty(fileno(stdin)))
1380: unset_nonblock(fileno(stdin));
1381: if (!isatty(fileno(stdout)))
1382: unset_nonblock(fileno(stdout));
1383: if (!isatty(fileno(stderr)))
1384: unset_nonblock(fileno(stderr));
1.116 dtucker 1385:
1386: /*
1387: * If there was no shell or command requested, there will be no remote
1388: * exit status to be returned. In that case, clear error code if the
1389: * connection was deliberately terminated at this end.
1390: */
1391: if (no_shell_flag && received_signal == SIGTERM) {
1392: received_signal = 0;
1393: exit_status = 0;
1394: }
1.75 markus 1395:
1.301 dtucker 1396: if (received_signal) {
1397: verbose("Killed by signal %d.", (int) received_signal);
1398: cleanup_exit(0);
1399: }
1.75 markus 1400:
1.13 markus 1401: /*
1402: * In interactive mode (with pseudo tty) display a message indicating
1403: * that the connection has been closed.
1404: */
1.11 markus 1405: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1406: snprintf(buf, sizeof buf,
1407: "Connection to %.64s closed.\r\n", host);
1.11 markus 1408: buffer_append(&stderr_buffer, buf, strlen(buf));
1409: }
1.70 markus 1410:
1.11 markus 1411: /* Output any buffered data for stderr. */
1.231 djm 1412: if (buffer_len(&stderr_buffer) > 0) {
1.230 djm 1413: len = atomicio(vwrite, fileno(stderr),
1414: buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1.231 djm 1415: if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1.11 markus 1416: error("Write failed flushing stderr buffer.");
1.231 djm 1417: else
1418: buffer_consume(&stderr_buffer, len);
1.11 markus 1419: }
1420:
1421: /* Clear and free any buffers. */
1.281 jsg 1422: explicit_bzero(buf, sizeof(buf));
1.11 markus 1423: buffer_free(&stderr_buffer);
1424:
1425: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1426: total_time = monotime_double() - start_time;
1.263 markus 1427: packet_get_bytes(&ibytes, &obytes);
1.200 markus 1428: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1429: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1430: if (total_time > 0)
1.200 markus 1431: verbose("Bytes per second: sent %.1f, received %.1f",
1432: obytes / total_time, ibytes / total_time);
1.11 markus 1433: /* Return the exit status of the program. */
1434: debug("Exit status %d", exit_status);
1435: return exit_status;
1.15 markus 1436: }
1437:
1438: /*********/
1439:
1.77 itojun 1440: static Channel *
1.303 djm 1441: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1442: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1443: {
1.103 deraadt 1444: Channel *c = NULL;
1.289 markus 1445: struct sshbuf *b = NULL;
1.40 markus 1446: char *listen_address, *originator_address;
1.208 djm 1447: u_short listen_port, originator_port;
1.289 markus 1448: int r;
1.40 markus 1449:
1450: /* Get rest of the packet */
1451: listen_address = packet_get_string(NULL);
1452: listen_port = packet_get_int();
1453: originator_address = packet_get_string(NULL);
1454: originator_port = packet_get_int();
1.93 markus 1455: packet_check_eom();
1.40 markus 1456:
1.261 millert 1457: debug("%s: listen %s port %d, originator %s port %d", __func__,
1458: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1459:
1.303 djm 1460: c = channel_connect_by_listen_address(ssh, listen_address, listen_port,
1.191 djm 1461: "forwarded-tcpip", originator_address);
1.40 markus 1462:
1.289 markus 1463: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1464: if ((b = sshbuf_new()) == NULL) {
1465: error("%s: alloc reply", __func__);
1466: goto out;
1467: }
1468: /* reconstruct and send to muxclient */
1469: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1470: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1471: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1472: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1473: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1474: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1475: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1476: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1477: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1478: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1479: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.289 markus 1480: error("%s: compose for muxclient %s", __func__,
1481: ssh_err(r));
1482: goto out;
1483: }
1484: }
1485:
1486: out:
1487: sshbuf_free(b);
1.250 djm 1488: free(originator_address);
1489: free(listen_address);
1.40 markus 1490: return c;
1491: }
1492:
1.103 deraadt 1493: static Channel *
1.303 djm 1494: client_request_forwarded_streamlocal(struct ssh *ssh,
1495: const char *request_type, int rchan)
1.261 millert 1496: {
1497: Channel *c = NULL;
1498: char *listen_path;
1499:
1500: /* Get the remote path. */
1501: listen_path = packet_get_string(NULL);
1502: /* XXX: Skip reserved field for now. */
1503: if (packet_get_string_ptr(NULL) == NULL)
1504: fatal("%s: packet_get_string_ptr failed", __func__);
1505: packet_check_eom();
1506:
1507: debug("%s: %s", __func__, listen_path);
1508:
1.303 djm 1509: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1510: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1511: free(listen_path);
1512: return c;
1513: }
1514:
1515: static Channel *
1.303 djm 1516: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1517: {
1518: Channel *c = NULL;
1519: char *originator;
1.208 djm 1520: u_short originator_port;
1.67 markus 1521: int sock;
1.40 markus 1522:
1523: if (!options.forward_x11) {
1524: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1525: error("Warning: this is probably a break-in attempt by a "
1526: "malicious server.");
1.221 djm 1527: return NULL;
1528: }
1.274 djm 1529: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1530: verbose("Rejected X11 connection after ForwardX11Timeout "
1531: "expired");
1.40 markus 1532: return NULL;
1533: }
1534: originator = packet_get_string(NULL);
1.310 ! djm 1535: originator_port = packet_get_int();
1.93 markus 1536: packet_check_eom();
1.40 markus 1537: /* XXX check permission */
1.47 markus 1538: debug("client_request_x11: request from %s %d", originator,
1539: originator_port);
1.250 djm 1540: free(originator);
1.303 djm 1541: sock = x11_connect_display(ssh);
1.67 markus 1542: if (sock < 0)
1543: return NULL;
1.303 djm 1544: c = channel_new(ssh, "x11",
1.67 markus 1545: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1546: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1547: c->force_drain = 1;
1.40 markus 1548: return c;
1549: }
1550:
1.103 deraadt 1551: static Channel *
1.303 djm 1552: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1553: {
1554: Channel *c = NULL;
1.262 djm 1555: int r, sock;
1.40 markus 1556:
1557: if (!options.forward_agent) {
1558: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1559: error("Warning: this is probably a break-in attempt by a "
1560: "malicious server.");
1.40 markus 1561: return NULL;
1562: }
1.262 djm 1563: if ((r = ssh_get_authentication_socket(&sock)) != 0) {
1564: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1565: debug("%s: ssh_get_authentication_socket: %s",
1566: __func__, ssh_err(r));
1.67 markus 1567: return NULL;
1.262 djm 1568: }
1.303 djm 1569: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1570: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1571: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1572: "authentication agent connection", 1);
1.82 markus 1573: c->force_drain = 1;
1.40 markus 1574: return c;
1.180 djm 1575: }
1576:
1.306 djm 1577: char *
1.303 djm 1578: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1579: int local_tun, int remote_tun)
1.180 djm 1580: {
1581: Channel *c;
1582: int fd;
1.306 djm 1583: char *ifname = NULL;
1.180 djm 1584:
1585: if (tun_mode == SSH_TUNMODE_NO)
1586: return 0;
1587:
1588: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1589:
1590: /* Open local tunnel device */
1.306 djm 1591: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1592: error("Tunnel device open failed.");
1.306 djm 1593: return NULL;
1.180 djm 1594: }
1.306 djm 1595: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1596:
1.303 djm 1597: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1598: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1599: c->datagram = 1;
1600:
1601: packet_start(SSH2_MSG_CHANNEL_OPEN);
1602: packet_put_cstring("tun@openssh.com");
1603: packet_put_int(c->self);
1604: packet_put_int(c->local_window_max);
1605: packet_put_int(c->local_maxpacket);
1606: packet_put_int(tun_mode);
1607: packet_put_int(remote_tun);
1608: packet_send();
1609:
1.306 djm 1610: return ifname;
1.40 markus 1611: }
1612:
1.22 markus 1613: /* XXXX move to generic input handler */
1.264 markus 1614: static int
1.297 markus 1615: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1616: {
1617: Channel *c = NULL;
1618: char *ctype;
1619: int rchan;
1.102 markus 1620: u_int rmaxpack, rwindow, len;
1.22 markus 1621:
1622: ctype = packet_get_string(&len);
1623: rchan = packet_get_int();
1624: rwindow = packet_get_int();
1625: rmaxpack = packet_get_int();
1626:
1.24 markus 1627: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1628: ctype, rchan, rwindow, rmaxpack);
1629:
1.40 markus 1630: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1631: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1632: rmaxpack);
1.261 millert 1633: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1634: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1635: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1636: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1637: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1638: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1639: }
1.289 markus 1640: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1641: debug3("proxied to downstream: %s", ctype);
1642: } else if (c != NULL) {
1.22 markus 1643: debug("confirm %s", ctype);
1644: c->remote_id = rchan;
1.304 djm 1645: c->have_remote_id = 1;
1.22 markus 1646: c->remote_window = rwindow;
1647: c->remote_maxpacket = rmaxpack;
1.69 markus 1648: if (c->type != SSH_CHANNEL_CONNECTING) {
1649: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1650: packet_put_int(c->remote_id);
1651: packet_put_int(c->self);
1652: packet_put_int(c->local_window);
1653: packet_put_int(c->local_maxpacket);
1654: packet_send();
1655: }
1.22 markus 1656: } else {
1657: debug("failure %s", ctype);
1658: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1659: packet_put_int(rchan);
1660: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.310 ! djm 1661: packet_put_cstring("open failed");
! 1662: packet_put_cstring("");
1.22 markus 1663: packet_send();
1664: }
1.250 djm 1665: free(ctype);
1.264 markus 1666: return 0;
1.22 markus 1667: }
1.267 djm 1668:
1.264 markus 1669: static int
1.297 markus 1670: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1671: {
1672: Channel *c = NULL;
1.123 djm 1673: int exitval, id, reply, success = 0;
1.48 markus 1674: char *rtype;
1675:
1676: id = packet_get_int();
1.303 djm 1677: c = channel_lookup(ssh, id);
1.297 markus 1678: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1679: return 0;
1.48 markus 1680: rtype = packet_get_string(NULL);
1681: reply = packet_get_char();
1682:
1683: debug("client_input_channel_req: channel %d rtype %s reply %d",
1684: id, rtype, reply);
1685:
1.128 djm 1686: if (id == -1) {
1687: error("client_input_channel_req: request for channel -1");
1.289 markus 1688: } else if (c == NULL) {
1.197 djm 1689: error("client_input_channel_req: channel %d: "
1690: "unknown channel", id);
1.193 markus 1691: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1692: packet_check_eom();
1.303 djm 1693: chan_rcvd_eow(ssh, c);
1.48 markus 1694: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1695: exitval = packet_get_int();
1.217 djm 1696: if (c->ctl_chan != -1) {
1.303 djm 1697: mux_exit_message(ssh, c, exitval);
1.215 djm 1698: success = 1;
1699: } else if (id == session_ident) {
1700: /* Record exit value of local session */
1.123 djm 1701: success = 1;
1702: exit_status = exitval;
1.215 djm 1703: } else {
1.218 djm 1704: /* Probably for a mux channel that has already closed */
1705: debug("%s: no sink for exit-status on channel %d",
1706: __func__, id);
1.123 djm 1707: }
1.93 markus 1708: packet_check_eom();
1.48 markus 1709: }
1.259 djm 1710: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1711: if (!c->have_remote_id)
1712: fatal("%s: channel %d: no remote_id",
1713: __func__, c->self);
1.48 markus 1714: packet_start(success ?
1715: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 1716: packet_put_int(c->remote_id);
1.48 markus 1717: packet_send();
1718: }
1.250 djm 1719: free(rtype);
1.264 markus 1720: return 0;
1.48 markus 1721: }
1.267 djm 1722:
1.269 djm 1723: struct hostkeys_update_ctx {
1724: /* The hostname and (optionally) IP address string for the server */
1725: char *host_str, *ip_str;
1726:
1727: /*
1728: * Keys received from the server and a flag for each indicating
1729: * whether they already exist in known_hosts.
1730: * keys_seen is filled in by hostkeys_find() and later (for new
1731: * keys) by client_global_hostkeys_private_confirm().
1732: */
1733: struct sshkey **keys;
1734: int *keys_seen;
1.294 djm 1735: size_t nkeys, nnew;
1.269 djm 1736:
1737: /*
1738: * Keys that are in known_hosts, but were not present in the update
1739: * from the server (i.e. scheduled to be deleted).
1740: * Filled in by hostkeys_find().
1741: */
1742: struct sshkey **old_keys;
1743: size_t nold;
1744: };
1745:
1746: static void
1747: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1748: {
1749: size_t i;
1750:
1751: if (ctx == NULL)
1752: return;
1753: for (i = 0; i < ctx->nkeys; i++)
1754: sshkey_free(ctx->keys[i]);
1755: free(ctx->keys);
1756: free(ctx->keys_seen);
1757: for (i = 0; i < ctx->nold; i++)
1758: sshkey_free(ctx->old_keys[i]);
1759: free(ctx->old_keys);
1760: free(ctx->host_str);
1761: free(ctx->ip_str);
1762: free(ctx);
1763: }
1764:
1765: static int
1766: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1767: {
1768: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1769: size_t i;
1770: struct sshkey **tmp;
1771:
1.293 djm 1772: if (l->status != HKF_STATUS_MATCHED || l->key == NULL)
1.269 djm 1773: return 0;
1774:
1775: /* Mark off keys we've already seen for this host */
1776: for (i = 0; i < ctx->nkeys; i++) {
1777: if (sshkey_equal(l->key, ctx->keys[i])) {
1778: debug3("%s: found %s key at %s:%ld", __func__,
1779: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1780: ctx->keys_seen[i] = 1;
1781: return 0;
1782: }
1783: }
1784: /* This line contained a key that not offered by the server */
1785: debug3("%s: deprecated %s key at %s:%ld", __func__,
1786: sshkey_ssh_name(l->key), l->path, l->linenum);
1.299 deraadt 1787: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1788: sizeof(*ctx->old_keys))) == NULL)
1.299 deraadt 1789: fatal("%s: recallocarray failed nold = %zu",
1.269 djm 1790: __func__, ctx->nold);
1791: ctx->old_keys = tmp;
1792: ctx->old_keys[ctx->nold++] = l->key;
1793: l->key = NULL;
1794:
1795: return 0;
1796: }
1797:
1798: static void
1799: update_known_hosts(struct hostkeys_update_ctx *ctx)
1800: {
1.271 djm 1801: int r, was_raw = 0;
1802: int loglevel = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK ?
1.269 djm 1803: SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1804: char *fp, *response;
1805: size_t i;
1806:
1807: for (i = 0; i < ctx->nkeys; i++) {
1808: if (ctx->keys_seen[i] != 2)
1809: continue;
1810: if ((fp = sshkey_fingerprint(ctx->keys[i],
1811: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1812: fatal("%s: sshkey_fingerprint failed", __func__);
1813: do_log2(loglevel, "Learned new hostkey: %s %s",
1814: sshkey_type(ctx->keys[i]), fp);
1815: free(fp);
1816: }
1817: for (i = 0; i < ctx->nold; i++) {
1818: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
1819: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1820: fatal("%s: sshkey_fingerprint failed", __func__);
1821: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
1822: sshkey_type(ctx->old_keys[i]), fp);
1823: free(fp);
1824: }
1825: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 1826: if (get_saved_tio() != NULL) {
1827: leave_raw_mode(1);
1828: was_raw = 1;
1829: }
1.269 djm 1830: response = NULL;
1831: for (i = 0; !quit_pending && i < 3; i++) {
1832: free(response);
1833: response = read_passphrase("Accept updated hostkeys? "
1834: "(yes/no): ", RP_ECHO);
1835: if (strcasecmp(response, "yes") == 0)
1836: break;
1837: else if (quit_pending || response == NULL ||
1838: strcasecmp(response, "no") == 0) {
1839: options.update_hostkeys = 0;
1840: break;
1841: } else {
1842: do_log2(loglevel, "Please enter "
1843: "\"yes\" or \"no\"");
1844: }
1845: }
1846: if (quit_pending || i >= 3 || response == NULL)
1847: options.update_hostkeys = 0;
1848: free(response);
1.271 djm 1849: if (was_raw)
1850: enter_raw_mode(1);
1.269 djm 1851: }
1852:
1853: /*
1854: * Now that all the keys are verified, we can go ahead and replace
1855: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
1856: * cancel the operation).
1857: */
1858: if (options.update_hostkeys != 0 &&
1859: (r = hostfile_replace_entries(options.user_hostfiles[0],
1860: ctx->host_str, ctx->ip_str, ctx->keys, ctx->nkeys,
1861: options.hash_known_hosts, 0,
1862: options.fingerprint_hash)) != 0)
1863: error("%s: hostfile_replace_entries failed: %s",
1864: __func__, ssh_err(r));
1865: }
1866:
1867: static void
1.303 djm 1868: client_global_hostkeys_private_confirm(struct ssh *ssh, int type,
1869: u_int32_t seq, void *_ctx)
1.269 djm 1870: {
1871: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1872: size_t i, ndone;
1873: struct sshbuf *signdata;
1.309 djm 1874: int r, kexsigtype, use_kexsigtype;
1.269 djm 1875: const u_char *sig;
1876: size_t siglen;
1877:
1878: if (ctx->nnew == 0)
1879: fatal("%s: ctx->nnew == 0", __func__); /* sanity */
1880: if (type != SSH2_MSG_REQUEST_SUCCESS) {
1881: error("Server failed to confirm ownership of "
1882: "private host keys");
1883: hostkeys_update_ctx_free(ctx);
1884: return;
1885: }
1.309 djm 1886: kexsigtype = sshkey_type_plain(
1887: sshkey_type_from_name(ssh->kex->hostkey_alg));
1888:
1.269 djm 1889: if ((signdata = sshbuf_new()) == NULL)
1890: fatal("%s: sshbuf_new failed", __func__);
1891: /* Don't want to accidentally accept an unbound signature */
1892: if (ssh->kex->session_id_len == 0)
1893: fatal("%s: ssh->kex->session_id_len == 0", __func__);
1894: /*
1895: * Expect a signature for each of the ctx->nnew private keys we
1896: * haven't seen before. They will be in the same order as the
1897: * ctx->keys where the corresponding ctx->keys_seen[i] == 0.
1898: */
1899: for (ndone = i = 0; i < ctx->nkeys; i++) {
1900: if (ctx->keys_seen[i])
1901: continue;
1902: /* Prepare data to be signed: session ID, unique string, key */
1903: sshbuf_reset(signdata);
1.270 djm 1904: if ( (r = sshbuf_put_cstring(signdata,
1905: "hostkeys-prove-00@openssh.com")) != 0 ||
1906: (r = sshbuf_put_string(signdata, ssh->kex->session_id,
1.269 djm 1907: ssh->kex->session_id_len)) != 0 ||
1908: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1909: fatal("%s: failed to prepare signature: %s",
1910: __func__, ssh_err(r));
1911: /* Extract and verify signature */
1912: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1913: error("%s: couldn't parse message: %s",
1914: __func__, ssh_err(r));
1915: goto out;
1916: }
1.309 djm 1917: /*
1918: * For RSA keys, prefer to use the signature type negotiated
1919: * during KEX to the default (SHA1).
1920: */
1921: use_kexsigtype = kexsigtype == KEY_RSA &&
1922: sshkey_type_plain(ctx->keys[i]->type) == KEY_RSA;
1.269 djm 1923: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 1924: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.309 djm 1925: use_kexsigtype ? ssh->kex->hostkey_alg : NULL, 0)) != 0) {
1.269 djm 1926: error("%s: server gave bad signature for %s key %zu",
1927: __func__, sshkey_type(ctx->keys[i]), i);
1928: goto out;
1929: }
1930: /* Key is good. Mark it as 'seen' */
1931: ctx->keys_seen[i] = 2;
1932: ndone++;
1933: }
1934: if (ndone != ctx->nnew)
1935: fatal("%s: ndone != ctx->nnew (%zu / %zu)", __func__,
1936: ndone, ctx->nnew); /* Shouldn't happen */
1937: ssh_packet_check_eom(ssh);
1938:
1939: /* Make the edits to known_hosts */
1940: update_known_hosts(ctx);
1941: out:
1942: hostkeys_update_ctx_free(ctx);
1943: }
1944:
1.267 djm 1945: /*
1.291 djm 1946: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
1947: * Made slightly less trivial by the multiple RSA signature algorithm names.
1948: */
1949: static int
1950: key_accepted_by_hostkeyalgs(const struct sshkey *key)
1951: {
1952: const char *ktype = sshkey_ssh_name(key);
1953: const char *hostkeyalgs = options.hostkeyalgorithms != NULL ?
1954: options.hostkeyalgorithms : KEX_DEFAULT_PK_ALG;
1955:
1956: if (key == NULL || key->type == KEY_UNSPEC)
1957: return 0;
1958: if (key->type == KEY_RSA &&
1959: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
1960: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
1961: return 1;
1962: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
1963: }
1964:
1965: /*
1.270 djm 1966: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 1967: * the server's hostkeys. The keys are checked against the user's
1968: * HostkeyAlgorithms preference before they are accepted.
1969: */
1970: static int
1971: client_input_hostkeys(void)
1972: {
1.269 djm 1973: struct ssh *ssh = active_state; /* XXX */
1.267 djm 1974: const u_char *blob = NULL;
1.269 djm 1975: size_t i, len = 0;
1.267 djm 1976: struct sshbuf *buf = NULL;
1.269 djm 1977: struct sshkey *key = NULL, **tmp;
1978: int r;
1979: char *fp;
1.267 djm 1980: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 1981: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 1982: struct hostkeys_update_ctx *ctx = NULL;
1.267 djm 1983:
1984: if (hostkeys_seen)
1985: fatal("%s: server already sent hostkeys", __func__);
1.269 djm 1986: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
1987: options.batch_mode)
1988: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 1989: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
1990: return 1;
1.272 djm 1991:
1992: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 1993: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 1994: sshkey_free(key);
1995: key = NULL;
1.269 djm 1996: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
1997: error("%s: couldn't parse message: %s",
1998: __func__, ssh_err(r));
1999: goto out;
2000: }
1.270 djm 2001: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
2002: error("%s: parse key: %s", __func__, ssh_err(r));
2003: goto out;
2004: }
1.267 djm 2005: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2006: SSH_FP_DEFAULT);
2007: debug3("%s: received %s key %s", __func__,
2008: sshkey_type(key), fp);
2009: free(fp);
1.275 markus 2010:
1.291 djm 2011: if (!key_accepted_by_hostkeyalgs(key)) {
1.267 djm 2012: debug3("%s: %s key not permitted by HostkeyAlgorithms",
2013: __func__, sshkey_ssh_name(key));
2014: continue;
2015: }
1.269 djm 2016: /* Skip certs */
2017: if (sshkey_is_cert(key)) {
2018: debug3("%s: %s key is a certificate; skipping",
2019: __func__, sshkey_ssh_name(key));
2020: continue;
2021: }
2022: /* Ensure keys are unique */
2023: for (i = 0; i < ctx->nkeys; i++) {
2024: if (sshkey_equal(key, ctx->keys[i])) {
2025: error("%s: received duplicated %s host key",
2026: __func__, sshkey_ssh_name(key));
2027: goto out;
2028: }
2029: }
2030: /* Key is good, record it */
1.299 deraadt 2031: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2032: sizeof(*ctx->keys))) == NULL)
1.299 deraadt 2033: fatal("%s: recallocarray failed nkeys = %zu",
1.269 djm 2034: __func__, ctx->nkeys);
2035: ctx->keys = tmp;
2036: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2037: key = NULL;
2038: }
2039:
1.269 djm 2040: if (ctx->nkeys == 0) {
1.270 djm 2041: debug("%s: server sent no hostkeys", __func__);
1.267 djm 2042: goto out;
2043: }
1.270 djm 2044:
1.269 djm 2045: if ((ctx->keys_seen = calloc(ctx->nkeys,
2046: sizeof(*ctx->keys_seen))) == NULL)
2047: fatal("%s: calloc failed", __func__);
1.267 djm 2048:
1.268 djm 2049: get_hostfile_hostname_ipaddr(host,
2050: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2051: options.port, &ctx->host_str,
2052: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2053:
1.269 djm 2054: /* Find which keys we already know about. */
2055: if ((r = hostkeys_foreach(options.user_hostfiles[0], hostkeys_find,
2056: ctx, ctx->host_str, ctx->ip_str,
2057: HKF_WANT_PARSE_KEY|HKF_WANT_MATCH)) != 0) {
2058: error("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1.267 djm 2059: goto out;
2060: }
2061:
1.269 djm 2062: /* Figure out if we have any new keys to add */
2063: ctx->nnew = 0;
2064: for (i = 0; i < ctx->nkeys; i++) {
2065: if (!ctx->keys_seen[i])
2066: ctx->nnew++;
2067: }
2068:
2069: debug3("%s: %zu keys from server: %zu new, %zu retained. %zu to remove",
2070: __func__, ctx->nkeys, ctx->nnew, ctx->nkeys - ctx->nnew, ctx->nold);
2071:
2072: if (ctx->nnew == 0 && ctx->nold != 0) {
2073: /* We have some keys to remove. Just do it. */
2074: update_known_hosts(ctx);
2075: } else if (ctx->nnew != 0) {
2076: /*
2077: * We have received hitherto-unseen keys from the server.
2078: * Ask the server to confirm ownership of the private halves.
2079: */
2080: debug3("%s: asking server to prove ownership for %zu keys",
2081: __func__, ctx->nnew);
2082: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2083: (r = sshpkt_put_cstring(ssh,
1.270 djm 2084: "hostkeys-prove-00@openssh.com")) != 0 ||
1.269 djm 2085: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
2086: fatal("%s: cannot prepare packet: %s",
2087: __func__, ssh_err(r));
2088: if ((buf = sshbuf_new()) == NULL)
2089: fatal("%s: sshbuf_new", __func__);
2090: for (i = 0; i < ctx->nkeys; i++) {
2091: if (ctx->keys_seen[i])
2092: continue;
2093: sshbuf_reset(buf);
2094: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0)
2095: fatal("%s: sshkey_putb: %s",
2096: __func__, ssh_err(r));
2097: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
2098: fatal("%s: sshpkt_put_string: %s",
2099: __func__, ssh_err(r));
2100: }
2101: if ((r = sshpkt_send(ssh)) != 0)
2102: fatal("%s: sshpkt_send: %s", __func__, ssh_err(r));
2103: client_register_global_confirm(
2104: client_global_hostkeys_private_confirm, ctx);
2105: ctx = NULL; /* will be freed in callback */
2106: }
2107:
1.267 djm 2108: /* Success */
2109: out:
1.269 djm 2110: hostkeys_update_ctx_free(ctx);
1.267 djm 2111: sshkey_free(key);
2112: sshbuf_free(buf);
1.269 djm 2113: /*
2114: * NB. Return success for all cases. The server doesn't need to know
2115: * what the client does with its hosts file.
2116: */
2117: return 1;
1.267 djm 2118: }
2119:
1.264 markus 2120: static int
1.297 markus 2121: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2122: {
2123: char *rtype;
2124: int want_reply;
2125: int success = 0;
2126:
1.267 djm 2127: rtype = packet_get_cstring(NULL);
1.95 markus 2128: want_reply = packet_get_char();
1.117 markus 2129: debug("client_input_global_request: rtype %s want_reply %d",
2130: rtype, want_reply);
1.270 djm 2131: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.267 djm 2132: success = client_input_hostkeys();
1.95 markus 2133: if (want_reply) {
2134: packet_start(success ?
2135: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
2136: packet_send();
2137: packet_write_wait();
2138: }
1.250 djm 2139: free(rtype);
1.264 markus 2140: return 0;
1.95 markus 2141: }
1.22 markus 2142:
1.123 djm 2143: void
1.303 djm 2144: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.190 djm 2145: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 2146: {
2147: int len;
1.132 djm 2148: Channel *c = NULL;
1.123 djm 2149:
2150: debug2("%s: id %d", __func__, id);
2151:
1.303 djm 2152: if ((c = channel_lookup(ssh, id)) == NULL)
2153: fatal("%s: channel %d: unknown channel", __func__, id);
1.224 djm 2154:
2155: packet_set_interactive(want_tty,
2156: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2157:
1.123 djm 2158: if (want_tty) {
2159: struct winsize ws;
2160:
2161: /* Store window size in the packet. */
2162: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2163: memset(&ws, 0, sizeof(ws));
2164:
1.303 djm 2165: channel_request_start(ssh, id, "pty-req", 1);
2166: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.123 djm 2167: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 2168: packet_put_int((u_int)ws.ws_col);
2169: packet_put_int((u_int)ws.ws_row);
2170: packet_put_int((u_int)ws.ws_xpixel);
2171: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 2172: if (tiop == NULL)
2173: tiop = get_saved_tio();
2174: tty_make_modes(-1, tiop);
1.123 djm 2175: packet_send();
2176: /* XXX wait for reply */
1.132 djm 2177: c->client_tty = 1;
1.123 djm 2178: }
2179:
2180: /* Transfer any environment variables from client to server */
1.126 djm 2181: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2182: int i, j, matched;
2183: char *name, *val;
2184:
2185: debug("Sending environment.");
1.126 djm 2186: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2187: /* Split */
1.126 djm 2188: name = xstrdup(env[i]);
1.123 djm 2189: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2190: free(name);
1.123 djm 2191: continue;
2192: }
2193: *val++ = '\0';
2194:
2195: matched = 0;
2196: for (j = 0; j < options.num_send_env; j++) {
2197: if (match_pattern(name, options.send_env[j])) {
2198: matched = 1;
2199: break;
2200: }
2201: }
2202: if (!matched) {
2203: debug3("Ignored env %s", name);
1.250 djm 2204: free(name);
1.123 djm 2205: continue;
2206: }
2207:
2208: debug("Sending env %s = %s", name, val);
1.303 djm 2209: channel_request_start(ssh, id, "env", 0);
1.123 djm 2210: packet_put_cstring(name);
2211: packet_put_cstring(val);
2212: packet_send();
1.250 djm 2213: free(name);
1.123 djm 2214: }
2215: }
2216:
2217: len = buffer_len(cmd);
2218: if (len > 0) {
2219: if (len > 900)
2220: len = 900;
2221: if (want_subsystem) {
1.190 djm 2222: debug("Sending subsystem: %.*s",
2223: len, (u_char*)buffer_ptr(cmd));
1.303 djm 2224: channel_request_start(ssh, id, "subsystem", 1);
2225: client_expect_confirm(ssh, id, "subsystem",
2226: CONFIRM_CLOSE);
1.123 djm 2227: } else {
1.190 djm 2228: debug("Sending command: %.*s",
2229: len, (u_char*)buffer_ptr(cmd));
1.303 djm 2230: channel_request_start(ssh, id, "exec", 1);
2231: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2232: }
2233: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2234: packet_send();
2235: } else {
1.303 djm 2236: channel_request_start(ssh, id, "shell", 1);
2237: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.123 djm 2238: packet_send();
2239: }
2240: }
2241:
1.77 itojun 2242: static void
1.292 djm 2243: client_init_dispatch(void)
1.16 markus 2244: {
1.55 markus 2245: dispatch_init(&dispatch_protocol_error);
1.100 markus 2246:
1.16 markus 2247: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2248: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2249: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2250: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2251: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2252: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2253: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2254: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2255: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2256: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2257: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2258: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2259:
2260: /* rekeying */
2261: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2262:
2263: /* global request reply messages */
2264: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2265: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2266: }
2267:
2268: void
2269: client_stop_mux(void)
2270: {
2271: if (options.control_path != NULL && muxserver_sock != -1)
2272: unlink(options.control_path);
2273: /*
1.247 dtucker 2274: * If we are in persist mode, or don't have a shell, signal that we
2275: * should close when all active channels are closed.
1.232 djm 2276: */
1.247 dtucker 2277: if (options.control_persist || no_shell_flag) {
1.232 djm 2278: session_closed = 1;
1.235 djm 2279: setproctitle("[stopped mux]");
2280: }
1.113 markus 2281: }
2282:
2283: /* client specific fatal cleanup */
2284: void
1.114 markus 2285: cleanup_exit(int i)
1.113 markus 2286: {
1.233 djm 2287: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2288: leave_non_blocking();
1.192 djm 2289: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2290: unlink(options.control_path);
1.223 djm 2291: ssh_kill_proxy_command();
1.114 markus 2292: _exit(i);
1.1 deraadt 2293: }
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