Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.304
1.304 ! djm 1: /* $OpenBSD: clientloop.c,v 1.303 2017/09/12 06:32:07 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: /*
221: * Returns current time in seconds from Jan 1, 1970 with the maximum
222: * available resolution.
223: */
1.1 deraadt 224:
1.77 itojun 225: static double
1.49 itojun 226: get_current_time(void)
1.1 deraadt 227: {
1.11 markus 228: struct timeval tv;
229: gettimeofday(&tv, NULL);
230: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 231: }
232:
1.222 djm 233: /*
234: * Sets control_persist_exit_time to the absolute time when the
235: * backgrounded control master should exit due to expiry of the
236: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
237: * control master process, or if there is no ControlPersist timeout.
238: */
239: static void
1.303 djm 240: set_control_persist_exit_time(struct ssh *ssh)
1.222 djm 241: {
242: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 243: || options.control_persist_timeout == 0) {
1.222 djm 244: /* not using a ControlPersist timeout */
245: control_persist_exit_time = 0;
1.303 djm 246: } else if (channel_still_open(ssh)) {
1.222 djm 247: /* some client connections are still open */
248: if (control_persist_exit_time > 0)
249: debug2("%s: cancel scheduled exit", __func__);
250: control_persist_exit_time = 0;
251: } else if (control_persist_exit_time <= 0) {
252: /* a client connection has recently closed */
1.251 dtucker 253: control_persist_exit_time = monotime() +
1.222 djm 254: (time_t)options.control_persist_timeout;
255: debug2("%s: schedule exit in %d seconds", __func__,
256: options.control_persist_timeout);
257: }
258: /* else we are already counting down to the timeout */
259: }
260:
1.238 dtucker 261: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
262: static int
263: client_x11_display_valid(const char *display)
264: {
265: size_t i, dlen;
266:
1.279 djm 267: if (display == NULL)
268: return 0;
269:
1.238 dtucker 270: dlen = strlen(display);
271: for (i = 0; i < dlen; i++) {
1.256 deraadt 272: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 273: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
274: debug("Invalid character '%c' in DISPLAY", display[i]);
275: return 0;
276: }
277: }
278: return 1;
279: }
280:
1.274 djm 281: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
282: #define X11_TIMEOUT_SLACK 60
1.279 djm 283: int
1.303 djm 284: client_x11_get_proto(struct ssh *ssh, const char *display,
285: const char *xauth_path, u_int trusted, u_int timeout,
286: char **_proto, char **_data)
1.138 djm 287: {
1.279 djm 288: char cmd[1024], line[512], xdisplay[512];
289: char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
1.138 djm 290: static char proto[512], data[512];
291: FILE *f;
1.288 tedu 292: int got_data = 0, generated = 0, do_unlink = 0, r;
1.138 djm 293: struct stat st;
1.274 djm 294: u_int now, x11_timeout_real;
1.138 djm 295:
296: *_proto = proto;
297: *_data = data;
1.279 djm 298: proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
1.138 djm 299:
1.279 djm 300: if (!client_x11_display_valid(display)) {
1.283 millert 301: if (display != NULL)
302: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
303: display);
1.279 djm 304: return -1;
305: }
306: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
1.138 djm 307: debug("No xauth program.");
1.279 djm 308: xauth_path = NULL;
309: }
310:
311: if (xauth_path != NULL) {
1.138 djm 312: /*
313: * Handle FamilyLocal case where $DISPLAY does
314: * not match an authorization entry. For this we
315: * just try "xauth list unix:displaynum.screennum".
316: * XXX: "localhost" match to determine FamilyLocal
317: * is not perfect.
318: */
319: if (strncmp(display, "localhost:", 10) == 0) {
1.279 djm 320: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
321: display + 10)) < 0 ||
322: (size_t)r >= sizeof(xdisplay)) {
323: error("%s: display name too long", __func__);
324: return -1;
325: }
1.138 djm 326: display = xdisplay;
327: }
328: if (trusted == 0) {
1.274 djm 329: /*
1.279 djm 330: * Generate an untrusted X11 auth cookie.
331: *
1.274 djm 332: * The authentication cookie should briefly outlive
333: * ssh's willingness to forward X11 connections to
334: * avoid nasty fail-open behaviour in the X server.
335: */
1.279 djm 336: mktemp_proto(xauthdir, sizeof(xauthdir));
337: if (mkdtemp(xauthdir) == NULL) {
338: error("%s: mkdtemp: %s",
339: __func__, strerror(errno));
340: return -1;
341: }
342: do_unlink = 1;
343: if ((r = snprintf(xauthfile, sizeof(xauthfile),
344: "%s/xauthfile", xauthdir)) < 0 ||
345: (size_t)r >= sizeof(xauthfile)) {
346: error("%s: xauthfile path too long", __func__);
347: unlink(xauthfile);
348: rmdir(xauthdir);
349: return -1;
350: }
351:
1.274 djm 352: if (timeout >= UINT_MAX - X11_TIMEOUT_SLACK)
353: x11_timeout_real = UINT_MAX;
354: else
355: x11_timeout_real = timeout + X11_TIMEOUT_SLACK;
1.279 djm 356: if ((r = snprintf(cmd, sizeof(cmd),
357: "%s -f %s generate %s " SSH_X11_PROTO
358: " untrusted timeout %u 2>" _PATH_DEVNULL,
359: xauth_path, xauthfile, display,
360: x11_timeout_real)) < 0 ||
361: (size_t)r >= sizeof(cmd))
362: fatal("%s: cmd too long", __func__);
363: debug2("%s: %s", __func__, cmd);
364: if (x11_refuse_time == 0) {
365: now = monotime() + 1;
366: if (UINT_MAX - timeout < now)
367: x11_refuse_time = UINT_MAX;
368: else
369: x11_refuse_time = now + timeout;
1.303 djm 370: channel_set_x11_refuse_time(ssh,
371: x11_refuse_time);
1.138 djm 372: }
1.279 djm 373: if (system(cmd) == 0)
374: generated = 1;
1.138 djm 375: }
1.181 markus 376:
377: /*
378: * When in untrusted mode, we read the cookie only if it was
379: * successfully generated as an untrusted one in the step
380: * above.
381: */
382: if (trusted || generated) {
383: snprintf(cmd, sizeof(cmd),
384: "%s %s%s list %s 2>" _PATH_DEVNULL,
385: xauth_path,
386: generated ? "-f " : "" ,
387: generated ? xauthfile : "",
388: display);
389: debug2("x11_get_proto: %s", cmd);
390: f = popen(cmd, "r");
391: if (f && fgets(line, sizeof(line), f) &&
392: sscanf(line, "%*s %511s %511s", proto, data) == 2)
393: got_data = 1;
394: if (f)
395: pclose(f);
1.279 djm 396: }
1.138 djm 397: }
398:
399: if (do_unlink) {
400: unlink(xauthfile);
401: rmdir(xauthdir);
402: }
403:
1.279 djm 404: /* Don't fall back to fake X11 data for untrusted forwarding */
405: if (!trusted && !got_data) {
406: error("Warning: untrusted X11 forwarding setup failed: "
407: "xauth key data not generated");
408: return -1;
409: }
410:
1.138 djm 411: /*
412: * If we didn't get authentication data, just make up some
413: * data. The forwarding code will check the validity of the
414: * response anyway, and substitute this data. The X11
415: * server, however, will ignore this fake data and use
416: * whatever authentication mechanisms it was using otherwise
417: * for the local connection.
418: */
419: if (!got_data) {
1.288 tedu 420: u_int8_t rnd[16];
421: u_int i;
1.138 djm 422:
423: logit("Warning: No xauth data; "
424: "using fake authentication data for X11 forwarding.");
425: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.288 tedu 426: arc4random_buf(rnd, sizeof(rnd));
427: for (i = 0; i < sizeof(rnd); i++) {
1.138 djm 428: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.288 tedu 429: rnd[i]);
1.138 djm 430: }
431: }
1.279 djm 432:
433: return 0;
1.1 deraadt 434: }
435:
1.13 markus 436: /*
437: * Checks if the client window has changed, and sends a packet about it to
438: * the server if so. The actual change is detected elsewhere (by a software
439: * interrupt on Unix); this just checks the flag and sends a message if
440: * appropriate.
441: */
1.1 deraadt 442:
1.77 itojun 443: static void
1.303 djm 444: client_check_window_change(struct ssh *ssh)
1.1 deraadt 445: {
1.292 djm 446: if (!received_window_change_signal)
1.16 markus 447: return;
448: /** XXX race */
449: received_window_change_signal = 0;
450:
1.292 djm 451: debug2("%s: changed", __func__);
1.16 markus 452:
1.303 djm 453: channel_send_window_changes(ssh);
1.1 deraadt 454: }
455:
1.264 markus 456: static int
1.297 markus 457: client_global_request_reply(int type, u_int32_t seq, struct ssh *ssh)
1.117 markus 458: {
1.196 djm 459: struct global_confirm *gc;
460:
461: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 462: return 0;
1.196 djm 463: if (gc->cb != NULL)
1.303 djm 464: gc->cb(ssh, type, seq, gc->ctx);
1.196 djm 465: if (--gc->ref_count <= 0) {
466: TAILQ_REMOVE(&global_confirms, gc, entry);
1.257 tedu 467: explicit_bzero(gc, sizeof(*gc));
1.250 djm 468: free(gc);
1.196 djm 469: }
470:
1.210 andreas 471: packet_set_alive_timeouts(0);
1.264 markus 472: return 0;
1.117 markus 473: }
474:
475: static void
476: server_alive_check(void)
477: {
1.210 andreas 478: if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
1.228 djm 479: logit("Timeout, server %s not responding.", host);
1.176 markus 480: cleanup_exit(255);
481: }
1.117 markus 482: packet_start(SSH2_MSG_GLOBAL_REQUEST);
483: packet_put_cstring("keepalive@openssh.com");
484: packet_put_char(1); /* boolean: want reply */
485: packet_send();
1.196 djm 486: /* Insert an empty placeholder to maintain ordering */
487: client_register_global_confirm(NULL, NULL);
1.117 markus 488: }
489:
1.13 markus 490: /*
491: * Waits until the client can do something (some data becomes available on
492: * one of the file descriptors).
493: */
1.77 itojun 494: static void
1.303 djm 495: client_wait_until_can_do_something(struct ssh *ssh,
496: fd_set **readsetp, fd_set **writesetp,
1.130 avsm 497: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 498: {
1.117 markus 499: struct timeval tv, *tvp;
1.222 djm 500: int timeout_secs;
1.251 dtucker 501: time_t minwait_secs = 0, server_alive_time = 0, now = monotime();
1.117 markus 502: int ret;
503:
1.46 markus 504: /* Add any selections by the channel mechanism. */
1.302 djm 505: channel_prepare_select(active_state, readsetp, writesetp, maxfdp,
506: nallocp, &minwait_secs);
1.11 markus 507:
1.292 djm 508: /* channel_prepare_select could have closed the last channel */
1.303 djm 509: if (session_closed && !channel_still_open(ssh) &&
1.292 djm 510: !packet_have_data_to_write()) {
511: /* clear mask since we did not call select() */
512: memset(*readsetp, 0, *nallocp);
513: memset(*writesetp, 0, *nallocp);
514: return;
1.16 markus 515: }
1.11 markus 516:
1.294 djm 517: FD_SET(connection_in, *readsetp);
518:
1.11 markus 519: /* Select server connection if have data to write to the server. */
520: if (packet_have_data_to_write())
1.46 markus 521: FD_SET(connection_out, *writesetp);
1.11 markus 522:
1.13 markus 523: /*
524: * Wait for something to happen. This will suspend the process until
525: * some selected descriptor can be read, written, or has some other
1.222 djm 526: * event pending, or a timeout expires.
1.13 markus 527: */
1.11 markus 528:
1.222 djm 529: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.292 djm 530: if (options.server_alive_interval > 0) {
1.222 djm 531: timeout_secs = options.server_alive_interval;
1.249 dtucker 532: server_alive_time = now + options.server_alive_interval;
533: }
1.292 djm 534: if (options.rekey_interval > 0 && !rekeying)
1.287 deraadt 535: timeout_secs = MINIMUM(timeout_secs, packet_get_rekey_timeout());
1.303 djm 536: set_control_persist_exit_time(ssh);
1.222 djm 537: if (control_persist_exit_time > 0) {
1.287 deraadt 538: timeout_secs = MINIMUM(timeout_secs,
1.249 dtucker 539: control_persist_exit_time - now);
1.222 djm 540: if (timeout_secs < 0)
541: timeout_secs = 0;
542: }
1.239 djm 543: if (minwait_secs != 0)
1.287 deraadt 544: timeout_secs = MINIMUM(timeout_secs, (int)minwait_secs);
1.222 djm 545: if (timeout_secs == INT_MAX)
1.117 markus 546: tvp = NULL;
1.129 deraadt 547: else {
1.222 djm 548: tv.tv_sec = timeout_secs;
1.117 markus 549: tv.tv_usec = 0;
550: tvp = &tv;
551: }
1.222 djm 552:
1.117 markus 553: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
554: if (ret < 0) {
1.11 markus 555: char buf[100];
1.51 markus 556:
557: /*
558: * We have to clear the select masks, because we return.
559: * We have to return, because the mainloop checks for the flags
560: * set by the signal handlers.
561: */
1.87 markus 562: memset(*readsetp, 0, *nallocp);
563: memset(*writesetp, 0, *nallocp);
1.50 deraadt 564:
1.11 markus 565: if (errno == EINTR)
566: return;
567: /* Note: we might still have data in the buffers. */
568: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
569: buffer_append(&stderr_buffer, buf, strlen(buf));
570: quit_pending = 1;
1.249 dtucker 571: } else if (ret == 0) {
572: /*
573: * Timeout. Could have been either keepalive or rekeying.
574: * Keepalive we check here, rekeying is checked in clientloop.
575: */
1.251 dtucker 576: if (server_alive_time != 0 && server_alive_time <= monotime())
1.249 dtucker 577: server_alive_check();
578: }
579:
1.11 markus 580: }
581:
1.77 itojun 582: static void
1.31 markus 583: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 584: {
1.11 markus 585: /* Flush stdout and stderr buffers. */
1.31 markus 586: if (buffer_len(bout) > 0)
1.197 djm 587: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
588: buffer_len(bout));
1.31 markus 589: if (buffer_len(berr) > 0)
1.197 djm 590: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
591: buffer_len(berr));
1.11 markus 592:
1.233 djm 593: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 594:
1.13 markus 595: /*
596: * Free (and clear) the buffer to reduce the amount of data that gets
597: * written to swap.
598: */
1.31 markus 599: buffer_free(bin);
600: buffer_free(bout);
601: buffer_free(berr);
1.11 markus 602:
603: /* Send the suspend signal to the program itself. */
604: kill(getpid(), SIGTSTP);
605:
1.132 djm 606: /* Reset window sizes in case they have changed */
607: received_window_change_signal = 1;
1.11 markus 608:
609: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 610: buffer_init(bin);
611: buffer_init(bout);
612: buffer_init(berr);
1.11 markus 613:
1.233 djm 614: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 615: }
616:
1.77 itojun 617: static void
1.161 deraadt 618: client_process_net_input(fd_set *readset)
1.11 markus 619: {
1.280 markus 620: int len;
1.17 markus 621: char buf[8192];
1.11 markus 622:
1.13 markus 623: /*
624: * Read input from the server, and add any such data to the buffer of
625: * the packet subsystem.
626: */
1.11 markus 627: if (FD_ISSET(connection_in, readset)) {
628: /* Read as much as possible. */
1.280 markus 629: len = read(connection_in, buf, sizeof(buf));
630: if (len == 0) {
1.197 djm 631: /*
632: * Received EOF. The remote host has closed the
633: * connection.
634: */
635: snprintf(buf, sizeof buf,
636: "Connection to %.300s closed by remote host.\r\n",
637: host);
1.1 deraadt 638: buffer_append(&stderr_buffer, buf, strlen(buf));
639: quit_pending = 1;
640: return;
1.11 markus 641: }
1.13 markus 642: /*
643: * There is a kernel bug on Solaris that causes select to
644: * sometimes wake up even though there is no data available.
645: */
1.53 millert 646: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 647: len = 0;
648:
649: if (len < 0) {
1.197 djm 650: /*
651: * An error has encountered. Perhaps there is a
652: * network problem.
653: */
654: snprintf(buf, sizeof buf,
655: "Read from remote host %.300s: %.100s\r\n",
656: host, strerror(errno));
1.11 markus 657: buffer_append(&stderr_buffer, buf, strlen(buf));
658: quit_pending = 1;
659: return;
660: }
661: packet_process_incoming(buf, len);
662: }
1.17 markus 663: }
1.16 markus 664:
1.97 jakob 665: static void
1.303 djm 666: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 667: {
1.190 djm 668: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
669: char errmsg[256];
670: int tochan;
671:
1.234 djm 672: /*
673: * If a TTY was explicitly requested, then a failure to allocate
674: * one is fatal.
675: */
676: if (cr->action == CONFIRM_TTY &&
677: (options.request_tty == REQUEST_TTY_FORCE ||
678: options.request_tty == REQUEST_TTY_YES))
679: cr->action = CONFIRM_CLOSE;
680:
1.190 djm 681: /* XXX supress on mux _client_ quietmode */
682: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 683: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 684:
685: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
686: debug2("%s request accepted on channel %d",
687: cr->request_type, c->self);
688: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
689: if (tochan) {
690: snprintf(errmsg, sizeof(errmsg),
691: "%s request failed\r\n", cr->request_type);
692: } else {
693: snprintf(errmsg, sizeof(errmsg),
694: "%s request failed on channel %d",
695: cr->request_type, c->self);
696: }
697: /* If error occurred on primary session channel, then exit */
1.234 djm 698: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 699: fatal("%s", errmsg);
1.234 djm 700: /*
701: * If error occurred on mux client, append to
702: * their stderr.
703: */
704: if (tochan) {
1.303 djm 705: buffer_append(c->extended, errmsg, strlen(errmsg));
1.234 djm 706: } else
1.190 djm 707: error("%s", errmsg);
1.234 djm 708: if (cr->action == CONFIRM_TTY) {
709: /*
710: * If a TTY allocation error occurred, then arrange
711: * for the correct TTY to leave raw mode.
712: */
713: if (c->self == session_ident)
714: leave_raw_mode(0);
715: else
1.303 djm 716: mux_tty_alloc_failed(ssh, c);
1.234 djm 717: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 718: chan_read_failed(ssh, c);
719: chan_write_failed(ssh, c);
1.190 djm 720: }
721: }
1.250 djm 722: free(cr);
1.190 djm 723: }
724:
725: static void
1.303 djm 726: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 727: {
1.250 djm 728: free(ctx);
1.190 djm 729: }
1.129 deraadt 730:
1.236 djm 731: void
1.303 djm 732: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 733: enum confirm_action action)
1.190 djm 734: {
1.255 djm 735: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 736:
1.190 djm 737: cr->request_type = request;
1.234 djm 738: cr->action = action;
1.123 djm 739:
1.303 djm 740: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 741: client_abandon_status_confirm, cr);
1.196 djm 742: }
743:
744: void
745: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
746: {
1.201 djm 747: struct global_confirm *gc, *last_gc;
1.196 djm 748:
749: /* Coalesce identical callbacks */
1.201 djm 750: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
751: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
752: if (++last_gc->ref_count >= INT_MAX)
753: fatal("%s: last_gc->ref_count = %d",
754: __func__, last_gc->ref_count);
1.196 djm 755: return;
756: }
757:
1.255 djm 758: gc = xcalloc(1, sizeof(*gc));
1.196 djm 759: gc->cb = cb;
760: gc->ctx = ctx;
761: gc->ref_count = 1;
762: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 763: }
764:
765: static void
1.303 djm 766: process_cmdline(struct ssh *ssh)
1.97 jakob 767: {
768: void (*handler)(int);
1.261 millert 769: char *s, *cmd;
770: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
771: struct Forward fwd;
1.97 jakob 772:
1.257 tedu 773: memset(&fwd, 0, sizeof(fwd));
1.183 djm 774:
1.233 djm 775: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 776: handler = signal(SIGINT, SIG_IGN);
1.99 markus 777: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 778: if (s == NULL)
779: goto out;
1.256 deraadt 780: while (isspace((u_char)*s))
1.97 jakob 781: s++;
1.121 djm 782: if (*s == '-')
783: s++; /* Skip cmdline '-', if any */
1.120 dtucker 784: if (*s == '\0')
1.97 jakob 785: goto out;
1.121 djm 786:
1.122 djm 787: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 788: logit("Commands:");
1.164 djm 789: logit(" -L[bind_address:]port:host:hostport "
790: "Request local forward");
791: logit(" -R[bind_address:]port:host:hostport "
792: "Request remote forward");
1.204 stevesk 793: logit(" -D[bind_address:]port "
794: "Request dynamic forward");
1.237 markus 795: logit(" -KL[bind_address:]port "
796: "Cancel local forward");
1.165 stevesk 797: logit(" -KR[bind_address:]port "
1.164 djm 798: "Cancel remote forward");
1.237 markus 799: logit(" -KD[bind_address:]port "
800: "Cancel dynamic forward");
1.146 reyk 801: if (!options.permit_local_command)
802: goto out;
1.164 djm 803: logit(" !args "
804: "Execute local command");
1.146 reyk 805: goto out;
806: }
807:
808: if (*s == '!' && options.permit_local_command) {
809: s++;
810: ssh_local_cmd(s);
1.121 djm 811: goto out;
812: }
813:
814: if (*s == 'K') {
815: delete = 1;
816: s++;
817: }
1.204 stevesk 818: if (*s == 'L')
819: local = 1;
820: else if (*s == 'R')
821: remote = 1;
822: else if (*s == 'D')
823: dynamic = 1;
824: else {
1.109 itojun 825: logit("Invalid command.");
1.97 jakob 826: goto out;
827: }
1.204 stevesk 828:
1.256 deraadt 829: while (isspace((u_char)*++s))
1.179 tedu 830: ;
1.97 jakob 831:
1.217 djm 832: /* XXX update list of forwards in options */
1.121 djm 833: if (delete) {
1.261 millert 834: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
835: if (!parse_forward(&fwd, s, 1, 0)) {
836: logit("Bad forwarding close specification.");
1.121 djm 837: goto out;
838: }
1.237 markus 839: if (remote)
1.303 djm 840: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 841: else if (dynamic)
1.303 djm 842: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 843: 0, &options.fwd_opts) > 0;
1.237 markus 844: else
1.303 djm 845: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 846: CHANNEL_CANCEL_PORT_STATIC,
847: &options.fwd_opts) > 0;
1.237 markus 848: if (!ok) {
1.290 dtucker 849: logit("Unknown port forwarding.");
1.237 markus 850: goto out;
851: }
852: logit("Canceled forwarding.");
1.121 djm 853: } else {
1.209 djm 854: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 855: logit("Bad forwarding specification.");
856: goto out;
857: }
1.204 stevesk 858: if (local || dynamic) {
1.303 djm 859: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 860: &options.fwd_opts)) {
1.121 djm 861: logit("Port forwarding failed.");
862: goto out;
863: }
1.135 djm 864: } else {
1.303 djm 865: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 866: logit("Port forwarding failed.");
867: goto out;
868: }
1.135 djm 869: }
1.121 djm 870: logit("Forwarding port.");
871: }
872:
1.97 jakob 873: out:
874: signal(SIGINT, handler);
1.233 djm 875: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 876: free(cmd);
877: free(fwd.listen_host);
1.261 millert 878: free(fwd.listen_path);
1.250 djm 879: free(fwd.connect_host);
1.261 millert 880: free(fwd.connect_path);
1.97 jakob 881: }
882:
1.244 dtucker 883: /* reasons to suppress output of an escape command in help output */
884: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 885: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
886: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
887: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.244 dtucker 888: struct escape_help_text {
889: const char *cmd;
890: const char *text;
891: unsigned int flags;
892: };
893: static struct escape_help_text esc_txt[] = {
894: {".", "terminate session", SUPPRESS_MUXMASTER},
895: {".", "terminate connection (and any multiplexed sessions)",
896: SUPPRESS_MUXCLIENT},
1.292 djm 897: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.244 dtucker 898: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1.292 djm 899: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 900: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 901: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
902: {"#", "list forwarded connections", SUPPRESS_NEVER},
903: {"&", "background ssh (when waiting for connections to terminate)",
904: SUPPRESS_MUXCLIENT},
905: {"?", "this message", SUPPRESS_NEVER},
906: };
907:
908: static void
1.292 djm 909: print_escape_help(Buffer *b, int escape_char, int mux_client, int using_stderr)
1.244 dtucker 910: {
911: unsigned int i, suppress_flags;
912: char string[1024];
913:
914: snprintf(string, sizeof string, "%c?\r\n"
915: "Supported escape sequences:\r\n", escape_char);
916: buffer_append(b, string, strlen(string));
917:
1.292 djm 918: suppress_flags =
1.244 dtucker 919: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
920: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
921: (using_stderr ? 0 : SUPPRESS_SYSLOG);
922:
923: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
924: if (esc_txt[i].flags & suppress_flags)
925: continue;
1.246 dtucker 926: snprintf(string, sizeof string, " %c%-3s - %s\r\n",
1.244 dtucker 927: escape_char, esc_txt[i].cmd, esc_txt[i].text);
928: buffer_append(b, string, strlen(string));
929: }
930:
931: snprintf(string, sizeof string,
1.246 dtucker 932: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 933: "(Note that escapes are only recognized immediately after "
934: "newline.)\r\n", escape_char, escape_char);
935: buffer_append(b, string, strlen(string));
936: }
937:
1.195 djm 938: /*
1.296 naddy 939: * Process the characters one by one.
1.195 djm 940: */
1.77 itojun 941: static int
1.303 djm 942: process_escapes(struct ssh *ssh, Channel *c,
943: Buffer *bin, Buffer *bout, Buffer *berr,
1.195 djm 944: char *buf, int len)
1.31 markus 945: {
1.32 markus 946: char string[1024];
1.31 markus 947: pid_t pid;
948: int bytes = 0;
1.42 markus 949: u_int i;
950: u_char ch;
1.31 markus 951: char *s;
1.294 djm 952: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
953: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 954:
1.294 djm 955: if (c->filter_ctx == NULL)
956: return 0;
1.195 djm 957:
1.139 djm 958: if (len <= 0)
959: return (0);
960:
961: for (i = 0; i < (u_int)len; i++) {
1.31 markus 962: /* Get one character at a time. */
963: ch = buf[i];
964:
1.294 djm 965: if (efc->escape_pending) {
1.31 markus 966: /* We have previously seen an escape character. */
967: /* Clear the flag now. */
1.294 djm 968: efc->escape_pending = 0;
1.31 markus 969:
970: /* Process the escaped character. */
971: switch (ch) {
972: case '.':
973: /* Terminate the connection. */
1.195 djm 974: snprintf(string, sizeof string, "%c.\r\n",
1.294 djm 975: efc->escape_char);
1.32 markus 976: buffer_append(berr, string, strlen(string));
1.31 markus 977:
1.217 djm 978: if (c && c->ctl_chan != -1) {
1.303 djm 979: chan_read_failed(ssh, c);
980: chan_write_failed(ssh, c);
981: if (c->detach_user) {
982: c->detach_user(ssh,
983: c->self, NULL);
984: }
1.253 dtucker 985: c->type = SSH_CHANNEL_ABANDONED;
1.303 djm 986: buffer_clear(c->input);
987: chan_ibuf_empty(ssh, c);
1.195 djm 988: return 0;
989: } else
990: quit_pending = 1;
1.31 markus 991: return -1;
992:
993: case 'Z' - 64:
1.195 djm 994: /* XXX support this for mux clients */
1.217 djm 995: if (c && c->ctl_chan != -1) {
1.245 dtucker 996: char b[16];
1.195 djm 997: noescape:
1.245 dtucker 998: if (ch == 'Z' - 64)
999: snprintf(b, sizeof b, "^Z");
1000: else
1001: snprintf(b, sizeof b, "%c", ch);
1.195 djm 1002: snprintf(string, sizeof string,
1.245 dtucker 1003: "%c%s escape not available to "
1.195 djm 1004: "multiplexed sessions\r\n",
1.294 djm 1005: efc->escape_char, b);
1.195 djm 1006: buffer_append(berr, string,
1007: strlen(string));
1008: continue;
1009: }
1.197 djm 1010: /* Suspend the program. Inform the user */
1.195 djm 1011: snprintf(string, sizeof string,
1.294 djm 1012: "%c^Z [suspend ssh]\r\n", efc->escape_char);
1.32 markus 1013: buffer_append(berr, string, strlen(string));
1.31 markus 1014:
1015: /* Restore terminal modes and suspend. */
1016: client_suspend_self(bin, bout, berr);
1017:
1018: /* We have been continued. */
1019: continue;
1020:
1.111 markus 1021: case 'B':
1.292 djm 1022: snprintf(string, sizeof string,
1.294 djm 1023: "%cB\r\n", efc->escape_char);
1.292 djm 1024: buffer_append(berr, string, strlen(string));
1.303 djm 1025: channel_request_start(ssh, c->self, "break", 0);
1.292 djm 1026: packet_put_int(1000);
1027: packet_send();
1.111 markus 1028: continue;
1029:
1.54 markus 1030: case 'R':
1.292 djm 1031: if (datafellows & SSH_BUG_NOREKEY)
1032: logit("Server does not "
1033: "support re-keying");
1034: else
1035: need_rekeying = 1;
1.54 markus 1036: continue;
1037:
1.242 dtucker 1038: case 'V':
1039: /* FALLTHROUGH */
1040: case 'v':
1041: if (c && c->ctl_chan != -1)
1042: goto noescape;
1043: if (!log_is_on_stderr()) {
1044: snprintf(string, sizeof string,
1045: "%c%c [Logging to syslog]\r\n",
1.294 djm 1046: efc->escape_char, ch);
1.242 dtucker 1047: buffer_append(berr, string,
1048: strlen(string));
1049: continue;
1050: }
1051: if (ch == 'V' && options.log_level >
1052: SYSLOG_LEVEL_QUIET)
1053: log_change_level(--options.log_level);
1054: if (ch == 'v' && options.log_level <
1055: SYSLOG_LEVEL_DEBUG3)
1056: log_change_level(++options.log_level);
1057: snprintf(string, sizeof string,
1.294 djm 1058: "%c%c [LogLevel %s]\r\n",
1059: efc->escape_char, ch,
1.242 dtucker 1060: log_level_name(options.log_level));
1061: buffer_append(berr, string, strlen(string));
1062: continue;
1063:
1.31 markus 1064: case '&':
1.217 djm 1065: if (c && c->ctl_chan != -1)
1.195 djm 1066: goto noescape;
1.31 markus 1067: /*
1.197 djm 1068: * Detach the program (continue to serve
1069: * connections, but put in background and no
1070: * more new connections).
1.31 markus 1071: */
1072: /* Restore tty modes. */
1.233 djm 1073: leave_raw_mode(
1074: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1075:
1076: /* Stop listening for new connections. */
1.303 djm 1077: channel_stop_listening(ssh);
1.31 markus 1078:
1.86 markus 1079: snprintf(string, sizeof string,
1.294 djm 1080: "%c& [backgrounded]\n", efc->escape_char);
1.86 markus 1081: buffer_append(berr, string, strlen(string));
1.31 markus 1082:
1083: /* Fork into background. */
1084: pid = fork();
1085: if (pid < 0) {
1086: error("fork: %.100s", strerror(errno));
1087: continue;
1088: }
1089: if (pid != 0) { /* This is the parent. */
1090: /* The parent just exits. */
1091: exit(0);
1092: }
1093: /* The child continues serving connections. */
1.292 djm 1094: buffer_append(bin, "\004", 1);
1095: /* fake EOF on stdin */
1096: return -1;
1.31 markus 1097: case '?':
1.294 djm 1098: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1099: (c && c->ctl_chan != -1),
1100: log_is_on_stderr());
1.31 markus 1101: continue;
1102:
1103: case '#':
1.195 djm 1104: snprintf(string, sizeof string, "%c#\r\n",
1.294 djm 1105: efc->escape_char);
1.32 markus 1106: buffer_append(berr, string, strlen(string));
1.303 djm 1107: s = channel_open_message(ssh);
1.31 markus 1108: buffer_append(berr, s, strlen(s));
1.250 djm 1109: free(s);
1.97 jakob 1110: continue;
1111:
1112: case 'C':
1.217 djm 1113: if (c && c->ctl_chan != -1)
1.206 djm 1114: goto noescape;
1.303 djm 1115: process_cmdline(ssh);
1.31 markus 1116: continue;
1117:
1118: default:
1.294 djm 1119: if (ch != efc->escape_char) {
1120: buffer_put_char(bin, efc->escape_char);
1.31 markus 1121: bytes++;
1122: }
1123: /* Escaped characters fall through here */
1124: break;
1125: }
1126: } else {
1127: /*
1.197 djm 1128: * The previous character was not an escape char.
1129: * Check if this is an escape.
1.31 markus 1130: */
1.294 djm 1131: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1132: /*
1133: * It is. Set the flag and continue to
1134: * next character.
1135: */
1.294 djm 1136: efc->escape_pending = 1;
1.31 markus 1137: continue;
1138: }
1139: }
1140:
1141: /*
1142: * Normal character. Record whether it was a newline,
1143: * and append it to the buffer.
1144: */
1145: last_was_cr = (ch == '\r' || ch == '\n');
1146: buffer_put_char(bin, ch);
1147: bytes++;
1148: }
1149: return bytes;
1150: }
1151:
1.13 markus 1152: /*
1.15 markus 1153: * Get packets from the connection input buffer, and process them as long as
1154: * there are packets available.
1155: *
1156: * Any unknown packets received during the actual
1157: * session cause the session to terminate. This is
1158: * intended to make debugging easier since no
1159: * confirmations are sent. Any compatible protocol
1160: * extensions must be negotiated during the
1161: * preparatory phase.
1162: */
1163:
1.77 itojun 1164: static void
1.49 itojun 1165: client_process_buffered_input_packets(void)
1.15 markus 1166: {
1.298 markus 1167: ssh_dispatch_run_fatal(active_state, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1168: }
1169:
1.31 markus 1170: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1171:
1.195 djm 1172: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1173: void *
1174: client_new_escape_filter_ctx(int escape_char)
1175: {
1176: struct escape_filter_ctx *ret;
1177:
1.255 djm 1178: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1179: ret->escape_pending = 0;
1180: ret->escape_char = escape_char;
1181: return (void *)ret;
1182: }
1183:
1.198 djm 1184: /* Free the escape filter context on channel free */
1185: void
1.303 djm 1186: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1187: {
1.250 djm 1188: free(ctx);
1.198 djm 1189: }
1190:
1.195 djm 1191: int
1.303 djm 1192: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1193: {
1.190 djm 1194: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1195: return 0;
1196:
1.303 djm 1197: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1198: buf, len);
1.30 markus 1199: }
1200:
1.77 itojun 1201: static void
1.303 djm 1202: client_channel_closed(struct ssh *ssh, int id, void *arg)
1.60 markus 1203: {
1.303 djm 1204: channel_cancel_cleanup(ssh, id);
1.60 markus 1205: session_closed = 1;
1.233 djm 1206: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1207: }
1208:
1.15 markus 1209: /*
1.13 markus 1210: * Implements the interactive session with the server. This is called after
1211: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1212: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1213: * used as an escape character for terminating or suspending the session.
1.13 markus 1214: */
1.20 markus 1215: int
1.303 djm 1216: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1217: int ssh2_chan_id)
1.1 deraadt 1218: {
1.46 markus 1219: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1220: double start_time, total_time;
1.284 djm 1221: int r, max_fd = 0, max_fd2 = 0, len;
1.200 markus 1222: u_int64_t ibytes, obytes;
1.130 avsm 1223: u_int nalloc = 0;
1.11 markus 1224: char buf[100];
1225:
1226: debug("Entering interactive session.");
1.277 semarie 1227:
1.278 semarie 1228: if (options.control_master &&
1.286 djm 1229: !option_clear_or_none(options.control_path)) {
1.278 semarie 1230: debug("pledge: id");
1.285 tb 1231: if (pledge("stdio rpath wpath cpath unix inet dns recvfd proc exec id tty",
1.278 semarie 1232: NULL) == -1)
1233: fatal("%s pledge(): %s", __func__, strerror(errno));
1234:
1235: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1236: debug("pledge: exec");
1237: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1238: NULL) == -1)
1239: fatal("%s pledge(): %s", __func__, strerror(errno));
1240:
1241: } else if (options.update_hostkeys) {
1242: debug("pledge: filesystem full");
1243: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1244: NULL) == -1)
1245: fatal("%s pledge(): %s", __func__, strerror(errno));
1246:
1.286 djm 1247: } else if (!option_clear_or_none(options.proxy_command) ||
1248: fork_after_authentication_flag) {
1.277 semarie 1249: debug("pledge: proc");
1250: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1251: fatal("%s pledge(): %s", __func__, strerror(errno));
1252:
1253: } else {
1254: debug("pledge: network");
1.300 mestre 1255: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.277 semarie 1256: fatal("%s pledge(): %s", __func__, strerror(errno));
1257: }
1.11 markus 1258:
1259: start_time = get_current_time();
1260:
1261: /* Initialize variables. */
1262: last_was_cr = 1;
1263: exit_status = -1;
1264: connection_in = packet_get_connection_in();
1265: connection_out = packet_get_connection_out();
1.287 deraadt 1266: max_fd = MAXIMUM(connection_in, connection_out);
1.46 markus 1267:
1.11 markus 1268: quit_pending = 0;
1269:
1270: /* Initialize buffers. */
1271: buffer_init(&stderr_buffer);
1272:
1.15 markus 1273: client_init_dispatch();
1274:
1.105 markus 1275: /*
1276: * Set signal handlers, (e.g. to restore non-blocking mode)
1277: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1278: */
1.131 djm 1279: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1280: signal(SIGHUP, signal_handler);
1.105 markus 1281: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1282: signal(SIGINT, signal_handler);
1283: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1284: signal(SIGQUIT, signal_handler);
1285: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1286: signal(SIGTERM, signal_handler);
1.132 djm 1287: signal(SIGWINCH, window_change_handler);
1.11 markus 1288:
1289: if (have_pty)
1.233 djm 1290: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1291:
1.292 djm 1292: session_ident = ssh2_chan_id;
1293: if (session_ident != -1) {
1294: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1295: channel_register_filter(ssh, session_ident,
1.292 djm 1296: client_simple_escape_filter, NULL,
1297: client_filter_cleanup,
1298: client_new_escape_filter_ctx(
1299: escape_char_arg));
1.232 djm 1300: }
1.303 djm 1301: channel_register_cleanup(ssh, session_ident,
1.292 djm 1302: client_channel_closed, 0);
1.48 markus 1303: }
1.30 markus 1304:
1.11 markus 1305: /* Main loop of the client for the interactive session mode. */
1306: while (!quit_pending) {
1307:
1.13 markus 1308: /* Process buffered packets sent by the server. */
1.11 markus 1309: client_process_buffered_input_packets();
1310:
1.303 djm 1311: if (session_closed && !channel_still_open(ssh))
1.60 markus 1312: break;
1313:
1.303 djm 1314: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1315: debug("rekeying in progress");
1.284 djm 1316: } else if (need_rekeying) {
1317: /* manual rekey request */
1318: debug("need rekeying");
1.303 djm 1319: if ((r = kex_start_rekex(ssh)) != 0)
1.284 djm 1320: fatal("%s: kex_start_rekex: %s", __func__,
1321: ssh_err(r));
1322: need_rekeying = 0;
1.56 markus 1323: } else {
1324: /*
1325: * Make packets from buffered channel data, and
1326: * enqueue them for sending to the server.
1327: */
1328: if (packet_not_very_much_data_to_write())
1.303 djm 1329: channel_output_poll(ssh);
1.11 markus 1330:
1.56 markus 1331: /*
1332: * Check if the window size has changed, and buffer a
1333: * message about it to the server if so.
1334: */
1.303 djm 1335: client_check_window_change(ssh);
1.11 markus 1336:
1.56 markus 1337: if (quit_pending)
1338: break;
1339: }
1.13 markus 1340: /*
1341: * Wait until we have something to do (something becomes
1342: * available on one of the descriptors).
1343: */
1.81 markus 1344: max_fd2 = max_fd;
1.303 djm 1345: client_wait_until_can_do_something(ssh, &readset, &writeset,
1346: &max_fd2, &nalloc, ssh_packet_is_rekeying(ssh));
1.11 markus 1347:
1348: if (quit_pending)
1349: break;
1350:
1.56 markus 1351: /* Do channel operations unless rekeying in progress. */
1.303 djm 1352: if (!ssh_packet_is_rekeying(ssh))
1353: channel_after_select(ssh, readset, writeset);
1.11 markus 1354:
1.17 markus 1355: /* Buffer input from the connection. */
1.46 markus 1356: client_process_net_input(readset);
1.17 markus 1357:
1358: if (quit_pending)
1359: break;
1.11 markus 1360:
1.197 djm 1361: /*
1362: * Send as much buffered packet data as possible to the
1363: * sender.
1364: */
1.46 markus 1365: if (FD_ISSET(connection_out, writeset))
1.11 markus 1366: packet_write_poll();
1.222 djm 1367:
1368: /*
1369: * If we are a backgrounded control master, and the
1370: * timeout has expired without any active client
1371: * connections, then quit.
1372: */
1373: if (control_persist_exit_time > 0) {
1.251 dtucker 1374: if (monotime() >= control_persist_exit_time) {
1.222 djm 1375: debug("ControlPersist timeout expired");
1376: break;
1377: }
1378: }
1.11 markus 1379: }
1.250 djm 1380: free(readset);
1381: free(writeset);
1.11 markus 1382:
1383: /* Terminate the session. */
1384:
1385: /* Stop watching for window change. */
1.132 djm 1386: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1387:
1.292 djm 1388: packet_start(SSH2_MSG_DISCONNECT);
1389: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1390: packet_put_cstring("disconnected by user");
1391: packet_put_cstring(""); /* language tag */
1392: packet_send();
1393: packet_write_wait();
1.11 markus 1394:
1.303 djm 1395: channel_free_all(ssh);
1.11 markus 1396:
1.75 markus 1397: if (have_pty)
1.233 djm 1398: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1399:
1400: /* restore blocking io */
1401: if (!isatty(fileno(stdin)))
1402: unset_nonblock(fileno(stdin));
1403: if (!isatty(fileno(stdout)))
1404: unset_nonblock(fileno(stdout));
1405: if (!isatty(fileno(stderr)))
1406: unset_nonblock(fileno(stderr));
1.116 dtucker 1407:
1408: /*
1409: * If there was no shell or command requested, there will be no remote
1410: * exit status to be returned. In that case, clear error code if the
1411: * connection was deliberately terminated at this end.
1412: */
1413: if (no_shell_flag && received_signal == SIGTERM) {
1414: received_signal = 0;
1415: exit_status = 0;
1416: }
1.75 markus 1417:
1.301 dtucker 1418: if (received_signal) {
1419: verbose("Killed by signal %d.", (int) received_signal);
1420: cleanup_exit(0);
1421: }
1.75 markus 1422:
1.13 markus 1423: /*
1424: * In interactive mode (with pseudo tty) display a message indicating
1425: * that the connection has been closed.
1426: */
1.11 markus 1427: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1428: snprintf(buf, sizeof buf,
1429: "Connection to %.64s closed.\r\n", host);
1.11 markus 1430: buffer_append(&stderr_buffer, buf, strlen(buf));
1431: }
1.70 markus 1432:
1.11 markus 1433: /* Output any buffered data for stderr. */
1.231 djm 1434: if (buffer_len(&stderr_buffer) > 0) {
1.230 djm 1435: len = atomicio(vwrite, fileno(stderr),
1436: buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1.231 djm 1437: if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1.11 markus 1438: error("Write failed flushing stderr buffer.");
1.231 djm 1439: else
1440: buffer_consume(&stderr_buffer, len);
1.11 markus 1441: }
1442:
1443: /* Clear and free any buffers. */
1.281 jsg 1444: explicit_bzero(buf, sizeof(buf));
1.11 markus 1445: buffer_free(&stderr_buffer);
1446:
1447: /* Report bytes transferred, and transfer rates. */
1448: total_time = get_current_time() - start_time;
1.263 markus 1449: packet_get_bytes(&ibytes, &obytes);
1.200 markus 1450: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1451: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1452: if (total_time > 0)
1.200 markus 1453: verbose("Bytes per second: sent %.1f, received %.1f",
1454: obytes / total_time, ibytes / total_time);
1.11 markus 1455: /* Return the exit status of the program. */
1456: debug("Exit status %d", exit_status);
1457: return exit_status;
1.15 markus 1458: }
1459:
1460: /*********/
1461:
1.77 itojun 1462: static Channel *
1.303 djm 1463: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1464: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1465: {
1.103 deraadt 1466: Channel *c = NULL;
1.289 markus 1467: struct sshbuf *b = NULL;
1.40 markus 1468: char *listen_address, *originator_address;
1.208 djm 1469: u_short listen_port, originator_port;
1.289 markus 1470: int r;
1.40 markus 1471:
1472: /* Get rest of the packet */
1473: listen_address = packet_get_string(NULL);
1474: listen_port = packet_get_int();
1475: originator_address = packet_get_string(NULL);
1476: originator_port = packet_get_int();
1.93 markus 1477: packet_check_eom();
1.40 markus 1478:
1.261 millert 1479: debug("%s: listen %s port %d, originator %s port %d", __func__,
1480: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1481:
1.303 djm 1482: c = channel_connect_by_listen_address(ssh, listen_address, listen_port,
1.191 djm 1483: "forwarded-tcpip", originator_address);
1.40 markus 1484:
1.289 markus 1485: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1486: if ((b = sshbuf_new()) == NULL) {
1487: error("%s: alloc reply", __func__);
1488: goto out;
1489: }
1490: /* reconstruct and send to muxclient */
1491: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1492: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1493: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1494: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1495: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1496: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1497: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1498: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1499: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1500: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1501: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.289 markus 1502: error("%s: compose for muxclient %s", __func__,
1503: ssh_err(r));
1504: goto out;
1505: }
1506: }
1507:
1508: out:
1509: sshbuf_free(b);
1.250 djm 1510: free(originator_address);
1511: free(listen_address);
1.40 markus 1512: return c;
1513: }
1514:
1.103 deraadt 1515: static Channel *
1.303 djm 1516: client_request_forwarded_streamlocal(struct ssh *ssh,
1517: const char *request_type, int rchan)
1.261 millert 1518: {
1519: Channel *c = NULL;
1520: char *listen_path;
1521:
1522: /* Get the remote path. */
1523: listen_path = packet_get_string(NULL);
1524: /* XXX: Skip reserved field for now. */
1525: if (packet_get_string_ptr(NULL) == NULL)
1526: fatal("%s: packet_get_string_ptr failed", __func__);
1527: packet_check_eom();
1528:
1529: debug("%s: %s", __func__, listen_path);
1530:
1.303 djm 1531: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1532: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1533: free(listen_path);
1534: return c;
1535: }
1536:
1537: static Channel *
1.303 djm 1538: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1539: {
1540: Channel *c = NULL;
1541: char *originator;
1.208 djm 1542: u_short originator_port;
1.67 markus 1543: int sock;
1.40 markus 1544:
1545: if (!options.forward_x11) {
1546: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1547: error("Warning: this is probably a break-in attempt by a "
1548: "malicious server.");
1.221 djm 1549: return NULL;
1550: }
1.274 djm 1551: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1552: verbose("Rejected X11 connection after ForwardX11Timeout "
1553: "expired");
1.40 markus 1554: return NULL;
1555: }
1556: originator = packet_get_string(NULL);
1557: if (datafellows & SSH_BUG_X11FWD) {
1558: debug2("buggy server: x11 request w/o originator_port");
1559: originator_port = 0;
1560: } else {
1561: originator_port = packet_get_int();
1562: }
1.93 markus 1563: packet_check_eom();
1.40 markus 1564: /* XXX check permission */
1.47 markus 1565: debug("client_request_x11: request from %s %d", originator,
1566: originator_port);
1.250 djm 1567: free(originator);
1.303 djm 1568: sock = x11_connect_display(ssh);
1.67 markus 1569: if (sock < 0)
1570: return NULL;
1.303 djm 1571: c = channel_new(ssh, "x11",
1.67 markus 1572: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1573: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1574: c->force_drain = 1;
1.40 markus 1575: return c;
1576: }
1577:
1.103 deraadt 1578: static Channel *
1.303 djm 1579: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1580: {
1581: Channel *c = NULL;
1.262 djm 1582: int r, sock;
1.40 markus 1583:
1584: if (!options.forward_agent) {
1585: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1586: error("Warning: this is probably a break-in attempt by a "
1587: "malicious server.");
1.40 markus 1588: return NULL;
1589: }
1.262 djm 1590: if ((r = ssh_get_authentication_socket(&sock)) != 0) {
1591: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1592: debug("%s: ssh_get_authentication_socket: %s",
1593: __func__, ssh_err(r));
1.67 markus 1594: return NULL;
1.262 djm 1595: }
1.303 djm 1596: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1597: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1598: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1599: "authentication agent connection", 1);
1.82 markus 1600: c->force_drain = 1;
1.40 markus 1601: return c;
1.180 djm 1602: }
1603:
1604: int
1.303 djm 1605: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1606: int local_tun, int remote_tun)
1.180 djm 1607: {
1608: Channel *c;
1609: int fd;
1610:
1611: if (tun_mode == SSH_TUNMODE_NO)
1612: return 0;
1613:
1614: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1615:
1616: /* Open local tunnel device */
1617: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1618: error("Tunnel device open failed.");
1619: return -1;
1620: }
1621:
1.303 djm 1622: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1623: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1624: c->datagram = 1;
1625:
1626: packet_start(SSH2_MSG_CHANNEL_OPEN);
1627: packet_put_cstring("tun@openssh.com");
1628: packet_put_int(c->self);
1629: packet_put_int(c->local_window_max);
1630: packet_put_int(c->local_maxpacket);
1631: packet_put_int(tun_mode);
1632: packet_put_int(remote_tun);
1633: packet_send();
1634:
1635: return 0;
1.40 markus 1636: }
1637:
1.22 markus 1638: /* XXXX move to generic input handler */
1.264 markus 1639: static int
1.297 markus 1640: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1641: {
1642: Channel *c = NULL;
1643: char *ctype;
1644: int rchan;
1.102 markus 1645: u_int rmaxpack, rwindow, len;
1.22 markus 1646:
1647: ctype = packet_get_string(&len);
1648: rchan = packet_get_int();
1649: rwindow = packet_get_int();
1650: rmaxpack = packet_get_int();
1651:
1.24 markus 1652: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1653: ctype, rchan, rwindow, rmaxpack);
1654:
1.40 markus 1655: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1656: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1657: rmaxpack);
1.261 millert 1658: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1659: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1660: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1661: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1662: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1663: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1664: }
1.289 markus 1665: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1666: debug3("proxied to downstream: %s", ctype);
1667: } else if (c != NULL) {
1.22 markus 1668: debug("confirm %s", ctype);
1669: c->remote_id = rchan;
1.304 ! djm 1670: c->have_remote_id = 1;
1.22 markus 1671: c->remote_window = rwindow;
1672: c->remote_maxpacket = rmaxpack;
1.69 markus 1673: if (c->type != SSH_CHANNEL_CONNECTING) {
1674: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1675: packet_put_int(c->remote_id);
1676: packet_put_int(c->self);
1677: packet_put_int(c->local_window);
1678: packet_put_int(c->local_maxpacket);
1679: packet_send();
1680: }
1.22 markus 1681: } else {
1682: debug("failure %s", ctype);
1683: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1684: packet_put_int(rchan);
1685: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1686: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1687: packet_put_cstring("open failed");
1.66 markus 1688: packet_put_cstring("");
1689: }
1.22 markus 1690: packet_send();
1691: }
1.250 djm 1692: free(ctype);
1.264 markus 1693: return 0;
1.22 markus 1694: }
1.267 djm 1695:
1.264 markus 1696: static int
1.297 markus 1697: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1698: {
1699: Channel *c = NULL;
1.123 djm 1700: int exitval, id, reply, success = 0;
1.48 markus 1701: char *rtype;
1702:
1703: id = packet_get_int();
1.303 djm 1704: c = channel_lookup(ssh, id);
1.297 markus 1705: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1706: return 0;
1.48 markus 1707: rtype = packet_get_string(NULL);
1708: reply = packet_get_char();
1709:
1710: debug("client_input_channel_req: channel %d rtype %s reply %d",
1711: id, rtype, reply);
1712:
1.128 djm 1713: if (id == -1) {
1714: error("client_input_channel_req: request for channel -1");
1.289 markus 1715: } else if (c == NULL) {
1.197 djm 1716: error("client_input_channel_req: channel %d: "
1717: "unknown channel", id);
1.193 markus 1718: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1719: packet_check_eom();
1.303 djm 1720: chan_rcvd_eow(ssh, c);
1.48 markus 1721: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1722: exitval = packet_get_int();
1.217 djm 1723: if (c->ctl_chan != -1) {
1.303 djm 1724: mux_exit_message(ssh, c, exitval);
1.215 djm 1725: success = 1;
1726: } else if (id == session_ident) {
1727: /* Record exit value of local session */
1.123 djm 1728: success = 1;
1729: exit_status = exitval;
1.215 djm 1730: } else {
1.218 djm 1731: /* Probably for a mux channel that has already closed */
1732: debug("%s: no sink for exit-status on channel %d",
1733: __func__, id);
1.123 djm 1734: }
1.93 markus 1735: packet_check_eom();
1.48 markus 1736: }
1.259 djm 1737: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 ! djm 1738: if (!c->have_remote_id)
! 1739: fatal("%s: channel %d: no remote_id",
! 1740: __func__, c->self);
1.48 markus 1741: packet_start(success ?
1742: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 1743: packet_put_int(c->remote_id);
1.48 markus 1744: packet_send();
1745: }
1.250 djm 1746: free(rtype);
1.264 markus 1747: return 0;
1.48 markus 1748: }
1.267 djm 1749:
1.269 djm 1750: struct hostkeys_update_ctx {
1751: /* The hostname and (optionally) IP address string for the server */
1752: char *host_str, *ip_str;
1753:
1754: /*
1755: * Keys received from the server and a flag for each indicating
1756: * whether they already exist in known_hosts.
1757: * keys_seen is filled in by hostkeys_find() and later (for new
1758: * keys) by client_global_hostkeys_private_confirm().
1759: */
1760: struct sshkey **keys;
1761: int *keys_seen;
1.294 djm 1762: size_t nkeys, nnew;
1.269 djm 1763:
1764: /*
1765: * Keys that are in known_hosts, but were not present in the update
1766: * from the server (i.e. scheduled to be deleted).
1767: * Filled in by hostkeys_find().
1768: */
1769: struct sshkey **old_keys;
1770: size_t nold;
1771: };
1772:
1773: static void
1774: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1775: {
1776: size_t i;
1777:
1778: if (ctx == NULL)
1779: return;
1780: for (i = 0; i < ctx->nkeys; i++)
1781: sshkey_free(ctx->keys[i]);
1782: free(ctx->keys);
1783: free(ctx->keys_seen);
1784: for (i = 0; i < ctx->nold; i++)
1785: sshkey_free(ctx->old_keys[i]);
1786: free(ctx->old_keys);
1787: free(ctx->host_str);
1788: free(ctx->ip_str);
1789: free(ctx);
1790: }
1791:
1792: static int
1793: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1794: {
1795: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1796: size_t i;
1797: struct sshkey **tmp;
1798:
1.293 djm 1799: if (l->status != HKF_STATUS_MATCHED || l->key == NULL)
1.269 djm 1800: return 0;
1801:
1802: /* Mark off keys we've already seen for this host */
1803: for (i = 0; i < ctx->nkeys; i++) {
1804: if (sshkey_equal(l->key, ctx->keys[i])) {
1805: debug3("%s: found %s key at %s:%ld", __func__,
1806: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1807: ctx->keys_seen[i] = 1;
1808: return 0;
1809: }
1810: }
1811: /* This line contained a key that not offered by the server */
1812: debug3("%s: deprecated %s key at %s:%ld", __func__,
1813: sshkey_ssh_name(l->key), l->path, l->linenum);
1.299 deraadt 1814: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1815: sizeof(*ctx->old_keys))) == NULL)
1.299 deraadt 1816: fatal("%s: recallocarray failed nold = %zu",
1.269 djm 1817: __func__, ctx->nold);
1818: ctx->old_keys = tmp;
1819: ctx->old_keys[ctx->nold++] = l->key;
1820: l->key = NULL;
1821:
1822: return 0;
1823: }
1824:
1825: static void
1826: update_known_hosts(struct hostkeys_update_ctx *ctx)
1827: {
1.271 djm 1828: int r, was_raw = 0;
1829: int loglevel = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK ?
1.269 djm 1830: SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1831: char *fp, *response;
1832: size_t i;
1833:
1834: for (i = 0; i < ctx->nkeys; i++) {
1835: if (ctx->keys_seen[i] != 2)
1836: continue;
1837: if ((fp = sshkey_fingerprint(ctx->keys[i],
1838: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1839: fatal("%s: sshkey_fingerprint failed", __func__);
1840: do_log2(loglevel, "Learned new hostkey: %s %s",
1841: sshkey_type(ctx->keys[i]), fp);
1842: free(fp);
1843: }
1844: for (i = 0; i < ctx->nold; i++) {
1845: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
1846: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1847: fatal("%s: sshkey_fingerprint failed", __func__);
1848: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
1849: sshkey_type(ctx->old_keys[i]), fp);
1850: free(fp);
1851: }
1852: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 1853: if (get_saved_tio() != NULL) {
1854: leave_raw_mode(1);
1855: was_raw = 1;
1856: }
1.269 djm 1857: response = NULL;
1858: for (i = 0; !quit_pending && i < 3; i++) {
1859: free(response);
1860: response = read_passphrase("Accept updated hostkeys? "
1861: "(yes/no): ", RP_ECHO);
1862: if (strcasecmp(response, "yes") == 0)
1863: break;
1864: else if (quit_pending || response == NULL ||
1865: strcasecmp(response, "no") == 0) {
1866: options.update_hostkeys = 0;
1867: break;
1868: } else {
1869: do_log2(loglevel, "Please enter "
1870: "\"yes\" or \"no\"");
1871: }
1872: }
1873: if (quit_pending || i >= 3 || response == NULL)
1874: options.update_hostkeys = 0;
1875: free(response);
1.271 djm 1876: if (was_raw)
1877: enter_raw_mode(1);
1.269 djm 1878: }
1879:
1880: /*
1881: * Now that all the keys are verified, we can go ahead and replace
1882: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
1883: * cancel the operation).
1884: */
1885: if (options.update_hostkeys != 0 &&
1886: (r = hostfile_replace_entries(options.user_hostfiles[0],
1887: ctx->host_str, ctx->ip_str, ctx->keys, ctx->nkeys,
1888: options.hash_known_hosts, 0,
1889: options.fingerprint_hash)) != 0)
1890: error("%s: hostfile_replace_entries failed: %s",
1891: __func__, ssh_err(r));
1892: }
1893:
1894: static void
1.303 djm 1895: client_global_hostkeys_private_confirm(struct ssh *ssh, int type,
1896: u_int32_t seq, void *_ctx)
1.269 djm 1897: {
1898: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1899: size_t i, ndone;
1900: struct sshbuf *signdata;
1901: int r;
1902: const u_char *sig;
1903: size_t siglen;
1904:
1905: if (ctx->nnew == 0)
1906: fatal("%s: ctx->nnew == 0", __func__); /* sanity */
1907: if (type != SSH2_MSG_REQUEST_SUCCESS) {
1908: error("Server failed to confirm ownership of "
1909: "private host keys");
1910: hostkeys_update_ctx_free(ctx);
1911: return;
1912: }
1913: if ((signdata = sshbuf_new()) == NULL)
1914: fatal("%s: sshbuf_new failed", __func__);
1915: /* Don't want to accidentally accept an unbound signature */
1916: if (ssh->kex->session_id_len == 0)
1917: fatal("%s: ssh->kex->session_id_len == 0", __func__);
1918: /*
1919: * Expect a signature for each of the ctx->nnew private keys we
1920: * haven't seen before. They will be in the same order as the
1921: * ctx->keys where the corresponding ctx->keys_seen[i] == 0.
1922: */
1923: for (ndone = i = 0; i < ctx->nkeys; i++) {
1924: if (ctx->keys_seen[i])
1925: continue;
1926: /* Prepare data to be signed: session ID, unique string, key */
1927: sshbuf_reset(signdata);
1.270 djm 1928: if ( (r = sshbuf_put_cstring(signdata,
1929: "hostkeys-prove-00@openssh.com")) != 0 ||
1930: (r = sshbuf_put_string(signdata, ssh->kex->session_id,
1.269 djm 1931: ssh->kex->session_id_len)) != 0 ||
1932: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1933: fatal("%s: failed to prepare signature: %s",
1934: __func__, ssh_err(r));
1935: /* Extract and verify signature */
1936: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1937: error("%s: couldn't parse message: %s",
1938: __func__, ssh_err(r));
1939: goto out;
1940: }
1941: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1942: sshbuf_ptr(signdata), sshbuf_len(signdata), 0)) != 0) {
1943: error("%s: server gave bad signature for %s key %zu",
1944: __func__, sshkey_type(ctx->keys[i]), i);
1945: goto out;
1946: }
1947: /* Key is good. Mark it as 'seen' */
1948: ctx->keys_seen[i] = 2;
1949: ndone++;
1950: }
1951: if (ndone != ctx->nnew)
1952: fatal("%s: ndone != ctx->nnew (%zu / %zu)", __func__,
1953: ndone, ctx->nnew); /* Shouldn't happen */
1954: ssh_packet_check_eom(ssh);
1955:
1956: /* Make the edits to known_hosts */
1957: update_known_hosts(ctx);
1958: out:
1959: hostkeys_update_ctx_free(ctx);
1960: }
1961:
1.267 djm 1962: /*
1.291 djm 1963: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
1964: * Made slightly less trivial by the multiple RSA signature algorithm names.
1965: */
1966: static int
1967: key_accepted_by_hostkeyalgs(const struct sshkey *key)
1968: {
1969: const char *ktype = sshkey_ssh_name(key);
1970: const char *hostkeyalgs = options.hostkeyalgorithms != NULL ?
1971: options.hostkeyalgorithms : KEX_DEFAULT_PK_ALG;
1972:
1973: if (key == NULL || key->type == KEY_UNSPEC)
1974: return 0;
1975: if (key->type == KEY_RSA &&
1976: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
1977: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
1978: return 1;
1979: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
1980: }
1981:
1982: /*
1.270 djm 1983: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 1984: * the server's hostkeys. The keys are checked against the user's
1985: * HostkeyAlgorithms preference before they are accepted.
1986: */
1987: static int
1988: client_input_hostkeys(void)
1989: {
1.269 djm 1990: struct ssh *ssh = active_state; /* XXX */
1.267 djm 1991: const u_char *blob = NULL;
1.269 djm 1992: size_t i, len = 0;
1.267 djm 1993: struct sshbuf *buf = NULL;
1.269 djm 1994: struct sshkey *key = NULL, **tmp;
1995: int r;
1996: char *fp;
1.267 djm 1997: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 1998: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 1999: struct hostkeys_update_ctx *ctx = NULL;
1.267 djm 2000:
2001: if (hostkeys_seen)
2002: fatal("%s: server already sent hostkeys", __func__);
1.269 djm 2003: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2004: options.batch_mode)
2005: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2006: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2007: return 1;
1.272 djm 2008:
2009: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2010: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2011: sshkey_free(key);
2012: key = NULL;
1.269 djm 2013: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
2014: error("%s: couldn't parse message: %s",
2015: __func__, ssh_err(r));
2016: goto out;
2017: }
1.270 djm 2018: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
2019: error("%s: parse key: %s", __func__, ssh_err(r));
2020: goto out;
2021: }
1.267 djm 2022: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2023: SSH_FP_DEFAULT);
2024: debug3("%s: received %s key %s", __func__,
2025: sshkey_type(key), fp);
2026: free(fp);
1.275 markus 2027:
1.291 djm 2028: if (!key_accepted_by_hostkeyalgs(key)) {
1.267 djm 2029: debug3("%s: %s key not permitted by HostkeyAlgorithms",
2030: __func__, sshkey_ssh_name(key));
2031: continue;
2032: }
1.269 djm 2033: /* Skip certs */
2034: if (sshkey_is_cert(key)) {
2035: debug3("%s: %s key is a certificate; skipping",
2036: __func__, sshkey_ssh_name(key));
2037: continue;
2038: }
2039: /* Ensure keys are unique */
2040: for (i = 0; i < ctx->nkeys; i++) {
2041: if (sshkey_equal(key, ctx->keys[i])) {
2042: error("%s: received duplicated %s host key",
2043: __func__, sshkey_ssh_name(key));
2044: goto out;
2045: }
2046: }
2047: /* Key is good, record it */
1.299 deraadt 2048: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2049: sizeof(*ctx->keys))) == NULL)
1.299 deraadt 2050: fatal("%s: recallocarray failed nkeys = %zu",
1.269 djm 2051: __func__, ctx->nkeys);
2052: ctx->keys = tmp;
2053: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2054: key = NULL;
2055: }
2056:
1.269 djm 2057: if (ctx->nkeys == 0) {
1.270 djm 2058: debug("%s: server sent no hostkeys", __func__);
1.267 djm 2059: goto out;
2060: }
1.270 djm 2061:
1.269 djm 2062: if ((ctx->keys_seen = calloc(ctx->nkeys,
2063: sizeof(*ctx->keys_seen))) == NULL)
2064: fatal("%s: calloc failed", __func__);
1.267 djm 2065:
1.268 djm 2066: get_hostfile_hostname_ipaddr(host,
2067: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2068: options.port, &ctx->host_str,
2069: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2070:
1.269 djm 2071: /* Find which keys we already know about. */
2072: if ((r = hostkeys_foreach(options.user_hostfiles[0], hostkeys_find,
2073: ctx, ctx->host_str, ctx->ip_str,
2074: HKF_WANT_PARSE_KEY|HKF_WANT_MATCH)) != 0) {
2075: error("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1.267 djm 2076: goto out;
2077: }
2078:
1.269 djm 2079: /* Figure out if we have any new keys to add */
2080: ctx->nnew = 0;
2081: for (i = 0; i < ctx->nkeys; i++) {
2082: if (!ctx->keys_seen[i])
2083: ctx->nnew++;
2084: }
2085:
2086: debug3("%s: %zu keys from server: %zu new, %zu retained. %zu to remove",
2087: __func__, ctx->nkeys, ctx->nnew, ctx->nkeys - ctx->nnew, ctx->nold);
2088:
2089: if (ctx->nnew == 0 && ctx->nold != 0) {
2090: /* We have some keys to remove. Just do it. */
2091: update_known_hosts(ctx);
2092: } else if (ctx->nnew != 0) {
2093: /*
2094: * We have received hitherto-unseen keys from the server.
2095: * Ask the server to confirm ownership of the private halves.
2096: */
2097: debug3("%s: asking server to prove ownership for %zu keys",
2098: __func__, ctx->nnew);
2099: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2100: (r = sshpkt_put_cstring(ssh,
1.270 djm 2101: "hostkeys-prove-00@openssh.com")) != 0 ||
1.269 djm 2102: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
2103: fatal("%s: cannot prepare packet: %s",
2104: __func__, ssh_err(r));
2105: if ((buf = sshbuf_new()) == NULL)
2106: fatal("%s: sshbuf_new", __func__);
2107: for (i = 0; i < ctx->nkeys; i++) {
2108: if (ctx->keys_seen[i])
2109: continue;
2110: sshbuf_reset(buf);
2111: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0)
2112: fatal("%s: sshkey_putb: %s",
2113: __func__, ssh_err(r));
2114: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
2115: fatal("%s: sshpkt_put_string: %s",
2116: __func__, ssh_err(r));
2117: }
2118: if ((r = sshpkt_send(ssh)) != 0)
2119: fatal("%s: sshpkt_send: %s", __func__, ssh_err(r));
2120: client_register_global_confirm(
2121: client_global_hostkeys_private_confirm, ctx);
2122: ctx = NULL; /* will be freed in callback */
2123: }
2124:
1.267 djm 2125: /* Success */
2126: out:
1.269 djm 2127: hostkeys_update_ctx_free(ctx);
1.267 djm 2128: sshkey_free(key);
2129: sshbuf_free(buf);
1.269 djm 2130: /*
2131: * NB. Return success for all cases. The server doesn't need to know
2132: * what the client does with its hosts file.
2133: */
2134: return 1;
1.267 djm 2135: }
2136:
1.264 markus 2137: static int
1.297 markus 2138: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2139: {
2140: char *rtype;
2141: int want_reply;
2142: int success = 0;
2143:
1.267 djm 2144: rtype = packet_get_cstring(NULL);
1.95 markus 2145: want_reply = packet_get_char();
1.117 markus 2146: debug("client_input_global_request: rtype %s want_reply %d",
2147: rtype, want_reply);
1.270 djm 2148: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.267 djm 2149: success = client_input_hostkeys();
1.95 markus 2150: if (want_reply) {
2151: packet_start(success ?
2152: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
2153: packet_send();
2154: packet_write_wait();
2155: }
1.250 djm 2156: free(rtype);
1.264 markus 2157: return 0;
1.95 markus 2158: }
1.22 markus 2159:
1.123 djm 2160: void
1.303 djm 2161: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.190 djm 2162: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 2163: {
2164: int len;
1.132 djm 2165: Channel *c = NULL;
1.123 djm 2166:
2167: debug2("%s: id %d", __func__, id);
2168:
1.303 djm 2169: if ((c = channel_lookup(ssh, id)) == NULL)
2170: fatal("%s: channel %d: unknown channel", __func__, id);
1.224 djm 2171:
2172: packet_set_interactive(want_tty,
2173: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2174:
1.123 djm 2175: if (want_tty) {
2176: struct winsize ws;
2177:
2178: /* Store window size in the packet. */
2179: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2180: memset(&ws, 0, sizeof(ws));
2181:
1.303 djm 2182: channel_request_start(ssh, id, "pty-req", 1);
2183: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.123 djm 2184: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 2185: packet_put_int((u_int)ws.ws_col);
2186: packet_put_int((u_int)ws.ws_row);
2187: packet_put_int((u_int)ws.ws_xpixel);
2188: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 2189: if (tiop == NULL)
2190: tiop = get_saved_tio();
2191: tty_make_modes(-1, tiop);
1.123 djm 2192: packet_send();
2193: /* XXX wait for reply */
1.132 djm 2194: c->client_tty = 1;
1.123 djm 2195: }
2196:
2197: /* Transfer any environment variables from client to server */
1.126 djm 2198: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2199: int i, j, matched;
2200: char *name, *val;
2201:
2202: debug("Sending environment.");
1.126 djm 2203: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2204: /* Split */
1.126 djm 2205: name = xstrdup(env[i]);
1.123 djm 2206: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2207: free(name);
1.123 djm 2208: continue;
2209: }
2210: *val++ = '\0';
2211:
2212: matched = 0;
2213: for (j = 0; j < options.num_send_env; j++) {
2214: if (match_pattern(name, options.send_env[j])) {
2215: matched = 1;
2216: break;
2217: }
2218: }
2219: if (!matched) {
2220: debug3("Ignored env %s", name);
1.250 djm 2221: free(name);
1.123 djm 2222: continue;
2223: }
2224:
2225: debug("Sending env %s = %s", name, val);
1.303 djm 2226: channel_request_start(ssh, id, "env", 0);
1.123 djm 2227: packet_put_cstring(name);
2228: packet_put_cstring(val);
2229: packet_send();
1.250 djm 2230: free(name);
1.123 djm 2231: }
2232: }
2233:
2234: len = buffer_len(cmd);
2235: if (len > 0) {
2236: if (len > 900)
2237: len = 900;
2238: if (want_subsystem) {
1.190 djm 2239: debug("Sending subsystem: %.*s",
2240: len, (u_char*)buffer_ptr(cmd));
1.303 djm 2241: channel_request_start(ssh, id, "subsystem", 1);
2242: client_expect_confirm(ssh, id, "subsystem",
2243: CONFIRM_CLOSE);
1.123 djm 2244: } else {
1.190 djm 2245: debug("Sending command: %.*s",
2246: len, (u_char*)buffer_ptr(cmd));
1.303 djm 2247: channel_request_start(ssh, id, "exec", 1);
2248: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2249: }
2250: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2251: packet_send();
2252: } else {
1.303 djm 2253: channel_request_start(ssh, id, "shell", 1);
2254: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.123 djm 2255: packet_send();
2256: }
2257: }
2258:
1.77 itojun 2259: static void
1.292 djm 2260: client_init_dispatch(void)
1.16 markus 2261: {
1.55 markus 2262: dispatch_init(&dispatch_protocol_error);
1.100 markus 2263:
1.16 markus 2264: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2265: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2266: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2267: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2268: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2269: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2270: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2271: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2272: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2273: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2274: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2275: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2276:
2277: /* rekeying */
2278: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2279:
2280: /* global request reply messages */
2281: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2282: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2283: }
2284:
2285: void
2286: client_stop_mux(void)
2287: {
2288: if (options.control_path != NULL && muxserver_sock != -1)
2289: unlink(options.control_path);
2290: /*
1.247 dtucker 2291: * If we are in persist mode, or don't have a shell, signal that we
2292: * should close when all active channels are closed.
1.232 djm 2293: */
1.247 dtucker 2294: if (options.control_persist || no_shell_flag) {
1.232 djm 2295: session_closed = 1;
1.235 djm 2296: setproctitle("[stopped mux]");
2297: }
1.113 markus 2298: }
2299:
2300: /* client specific fatal cleanup */
2301: void
1.114 markus 2302: cleanup_exit(int i)
1.113 markus 2303: {
1.233 djm 2304: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2305: leave_non_blocking();
1.192 djm 2306: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2307: unlink(options.control_path);
1.223 djm 2308: ssh_kill_proxy_command();
1.114 markus 2309: _exit(i);
1.1 deraadt 2310: }
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