Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.305
1.305 ! djm 1: /* $OpenBSD: clientloop.c,v 1.304 2017/09/12 06:35:32 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:
1.305 ! djm 595: sshbuf_reset(bin);
! 596: sshbuf_reset(bout);
! 597: sshbuf_reset(berr);
1.11 markus 598:
599: /* Send the suspend signal to the program itself. */
600: kill(getpid(), SIGTSTP);
601:
1.132 djm 602: /* Reset window sizes in case they have changed */
603: received_window_change_signal = 1;
1.11 markus 604:
1.233 djm 605: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 606: }
607:
1.77 itojun 608: static void
1.161 deraadt 609: client_process_net_input(fd_set *readset)
1.11 markus 610: {
1.280 markus 611: int len;
1.17 markus 612: char buf[8192];
1.11 markus 613:
1.13 markus 614: /*
615: * Read input from the server, and add any such data to the buffer of
616: * the packet subsystem.
617: */
1.11 markus 618: if (FD_ISSET(connection_in, readset)) {
619: /* Read as much as possible. */
1.280 markus 620: len = read(connection_in, buf, sizeof(buf));
621: if (len == 0) {
1.197 djm 622: /*
623: * Received EOF. The remote host has closed the
624: * connection.
625: */
626: snprintf(buf, sizeof buf,
627: "Connection to %.300s closed by remote host.\r\n",
628: host);
1.1 deraadt 629: buffer_append(&stderr_buffer, buf, strlen(buf));
630: quit_pending = 1;
631: return;
1.11 markus 632: }
1.13 markus 633: /*
634: * There is a kernel bug on Solaris that causes select to
635: * sometimes wake up even though there is no data available.
636: */
1.53 millert 637: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 638: len = 0;
639:
640: if (len < 0) {
1.197 djm 641: /*
642: * An error has encountered. Perhaps there is a
643: * network problem.
644: */
645: snprintf(buf, sizeof buf,
646: "Read from remote host %.300s: %.100s\r\n",
647: host, strerror(errno));
1.11 markus 648: buffer_append(&stderr_buffer, buf, strlen(buf));
649: quit_pending = 1;
650: return;
651: }
652: packet_process_incoming(buf, len);
653: }
1.17 markus 654: }
1.16 markus 655:
1.97 jakob 656: static void
1.303 djm 657: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 658: {
1.190 djm 659: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
660: char errmsg[256];
661: int tochan;
662:
1.234 djm 663: /*
664: * If a TTY was explicitly requested, then a failure to allocate
665: * one is fatal.
666: */
667: if (cr->action == CONFIRM_TTY &&
668: (options.request_tty == REQUEST_TTY_FORCE ||
669: options.request_tty == REQUEST_TTY_YES))
670: cr->action = CONFIRM_CLOSE;
671:
1.190 djm 672: /* XXX supress on mux _client_ quietmode */
673: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 674: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 675:
676: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
677: debug2("%s request accepted on channel %d",
678: cr->request_type, c->self);
679: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
680: if (tochan) {
681: snprintf(errmsg, sizeof(errmsg),
682: "%s request failed\r\n", cr->request_type);
683: } else {
684: snprintf(errmsg, sizeof(errmsg),
685: "%s request failed on channel %d",
686: cr->request_type, c->self);
687: }
688: /* If error occurred on primary session channel, then exit */
1.234 djm 689: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 690: fatal("%s", errmsg);
1.234 djm 691: /*
692: * If error occurred on mux client, append to
693: * their stderr.
694: */
695: if (tochan) {
1.303 djm 696: buffer_append(c->extended, errmsg, strlen(errmsg));
1.234 djm 697: } else
1.190 djm 698: error("%s", errmsg);
1.234 djm 699: if (cr->action == CONFIRM_TTY) {
700: /*
701: * If a TTY allocation error occurred, then arrange
702: * for the correct TTY to leave raw mode.
703: */
704: if (c->self == session_ident)
705: leave_raw_mode(0);
706: else
1.303 djm 707: mux_tty_alloc_failed(ssh, c);
1.234 djm 708: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 709: chan_read_failed(ssh, c);
710: chan_write_failed(ssh, c);
1.190 djm 711: }
712: }
1.250 djm 713: free(cr);
1.190 djm 714: }
715:
716: static void
1.303 djm 717: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 718: {
1.250 djm 719: free(ctx);
1.190 djm 720: }
1.129 deraadt 721:
1.236 djm 722: void
1.303 djm 723: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 724: enum confirm_action action)
1.190 djm 725: {
1.255 djm 726: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 727:
1.190 djm 728: cr->request_type = request;
1.234 djm 729: cr->action = action;
1.123 djm 730:
1.303 djm 731: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 732: client_abandon_status_confirm, cr);
1.196 djm 733: }
734:
735: void
736: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
737: {
1.201 djm 738: struct global_confirm *gc, *last_gc;
1.196 djm 739:
740: /* Coalesce identical callbacks */
1.201 djm 741: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
742: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
743: if (++last_gc->ref_count >= INT_MAX)
744: fatal("%s: last_gc->ref_count = %d",
745: __func__, last_gc->ref_count);
1.196 djm 746: return;
747: }
748:
1.255 djm 749: gc = xcalloc(1, sizeof(*gc));
1.196 djm 750: gc->cb = cb;
751: gc->ctx = ctx;
752: gc->ref_count = 1;
753: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 754: }
755:
756: static void
1.303 djm 757: process_cmdline(struct ssh *ssh)
1.97 jakob 758: {
759: void (*handler)(int);
1.261 millert 760: char *s, *cmd;
761: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
762: struct Forward fwd;
1.97 jakob 763:
1.257 tedu 764: memset(&fwd, 0, sizeof(fwd));
1.183 djm 765:
1.233 djm 766: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 767: handler = signal(SIGINT, SIG_IGN);
1.99 markus 768: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 769: if (s == NULL)
770: goto out;
1.256 deraadt 771: while (isspace((u_char)*s))
1.97 jakob 772: s++;
1.121 djm 773: if (*s == '-')
774: s++; /* Skip cmdline '-', if any */
1.120 dtucker 775: if (*s == '\0')
1.97 jakob 776: goto out;
1.121 djm 777:
1.122 djm 778: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 779: logit("Commands:");
1.164 djm 780: logit(" -L[bind_address:]port:host:hostport "
781: "Request local forward");
782: logit(" -R[bind_address:]port:host:hostport "
783: "Request remote forward");
1.204 stevesk 784: logit(" -D[bind_address:]port "
785: "Request dynamic forward");
1.237 markus 786: logit(" -KL[bind_address:]port "
787: "Cancel local forward");
1.165 stevesk 788: logit(" -KR[bind_address:]port "
1.164 djm 789: "Cancel remote forward");
1.237 markus 790: logit(" -KD[bind_address:]port "
791: "Cancel dynamic forward");
1.146 reyk 792: if (!options.permit_local_command)
793: goto out;
1.164 djm 794: logit(" !args "
795: "Execute local command");
1.146 reyk 796: goto out;
797: }
798:
799: if (*s == '!' && options.permit_local_command) {
800: s++;
801: ssh_local_cmd(s);
1.121 djm 802: goto out;
803: }
804:
805: if (*s == 'K') {
806: delete = 1;
807: s++;
808: }
1.204 stevesk 809: if (*s == 'L')
810: local = 1;
811: else if (*s == 'R')
812: remote = 1;
813: else if (*s == 'D')
814: dynamic = 1;
815: else {
1.109 itojun 816: logit("Invalid command.");
1.97 jakob 817: goto out;
818: }
1.204 stevesk 819:
1.256 deraadt 820: while (isspace((u_char)*++s))
1.179 tedu 821: ;
1.97 jakob 822:
1.217 djm 823: /* XXX update list of forwards in options */
1.121 djm 824: if (delete) {
1.261 millert 825: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
826: if (!parse_forward(&fwd, s, 1, 0)) {
827: logit("Bad forwarding close specification.");
1.121 djm 828: goto out;
829: }
1.237 markus 830: if (remote)
1.303 djm 831: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 832: else if (dynamic)
1.303 djm 833: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 834: 0, &options.fwd_opts) > 0;
1.237 markus 835: else
1.303 djm 836: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 837: CHANNEL_CANCEL_PORT_STATIC,
838: &options.fwd_opts) > 0;
1.237 markus 839: if (!ok) {
1.290 dtucker 840: logit("Unknown port forwarding.");
1.237 markus 841: goto out;
842: }
843: logit("Canceled forwarding.");
1.121 djm 844: } else {
1.209 djm 845: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 846: logit("Bad forwarding specification.");
847: goto out;
848: }
1.204 stevesk 849: if (local || dynamic) {
1.303 djm 850: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 851: &options.fwd_opts)) {
1.121 djm 852: logit("Port forwarding failed.");
853: goto out;
854: }
1.135 djm 855: } else {
1.303 djm 856: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 857: logit("Port forwarding failed.");
858: goto out;
859: }
1.135 djm 860: }
1.121 djm 861: logit("Forwarding port.");
862: }
863:
1.97 jakob 864: out:
865: signal(SIGINT, handler);
1.233 djm 866: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 867: free(cmd);
868: free(fwd.listen_host);
1.261 millert 869: free(fwd.listen_path);
1.250 djm 870: free(fwd.connect_host);
1.261 millert 871: free(fwd.connect_path);
1.97 jakob 872: }
873:
1.244 dtucker 874: /* reasons to suppress output of an escape command in help output */
875: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 876: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
877: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
878: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.244 dtucker 879: struct escape_help_text {
880: const char *cmd;
881: const char *text;
882: unsigned int flags;
883: };
884: static struct escape_help_text esc_txt[] = {
885: {".", "terminate session", SUPPRESS_MUXMASTER},
886: {".", "terminate connection (and any multiplexed sessions)",
887: SUPPRESS_MUXCLIENT},
1.292 djm 888: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.244 dtucker 889: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1.292 djm 890: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 891: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 892: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
893: {"#", "list forwarded connections", SUPPRESS_NEVER},
894: {"&", "background ssh (when waiting for connections to terminate)",
895: SUPPRESS_MUXCLIENT},
896: {"?", "this message", SUPPRESS_NEVER},
897: };
898:
899: static void
1.292 djm 900: print_escape_help(Buffer *b, int escape_char, int mux_client, int using_stderr)
1.244 dtucker 901: {
902: unsigned int i, suppress_flags;
903: char string[1024];
904:
905: snprintf(string, sizeof string, "%c?\r\n"
906: "Supported escape sequences:\r\n", escape_char);
907: buffer_append(b, string, strlen(string));
908:
1.292 djm 909: suppress_flags =
1.244 dtucker 910: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
911: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
912: (using_stderr ? 0 : SUPPRESS_SYSLOG);
913:
914: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
915: if (esc_txt[i].flags & suppress_flags)
916: continue;
1.246 dtucker 917: snprintf(string, sizeof string, " %c%-3s - %s\r\n",
1.244 dtucker 918: escape_char, esc_txt[i].cmd, esc_txt[i].text);
919: buffer_append(b, string, strlen(string));
920: }
921:
922: snprintf(string, sizeof string,
1.246 dtucker 923: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 924: "(Note that escapes are only recognized immediately after "
925: "newline.)\r\n", escape_char, escape_char);
926: buffer_append(b, string, strlen(string));
927: }
928:
1.195 djm 929: /*
1.296 naddy 930: * Process the characters one by one.
1.195 djm 931: */
1.77 itojun 932: static int
1.303 djm 933: process_escapes(struct ssh *ssh, Channel *c,
934: Buffer *bin, Buffer *bout, Buffer *berr,
1.195 djm 935: char *buf, int len)
1.31 markus 936: {
1.32 markus 937: char string[1024];
1.31 markus 938: pid_t pid;
939: int bytes = 0;
1.42 markus 940: u_int i;
941: u_char ch;
1.31 markus 942: char *s;
1.294 djm 943: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
944: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 945:
1.294 djm 946: if (c->filter_ctx == NULL)
947: return 0;
1.195 djm 948:
1.139 djm 949: if (len <= 0)
950: return (0);
951:
952: for (i = 0; i < (u_int)len; i++) {
1.31 markus 953: /* Get one character at a time. */
954: ch = buf[i];
955:
1.294 djm 956: if (efc->escape_pending) {
1.31 markus 957: /* We have previously seen an escape character. */
958: /* Clear the flag now. */
1.294 djm 959: efc->escape_pending = 0;
1.31 markus 960:
961: /* Process the escaped character. */
962: switch (ch) {
963: case '.':
964: /* Terminate the connection. */
1.195 djm 965: snprintf(string, sizeof string, "%c.\r\n",
1.294 djm 966: efc->escape_char);
1.32 markus 967: buffer_append(berr, string, strlen(string));
1.31 markus 968:
1.217 djm 969: if (c && c->ctl_chan != -1) {
1.303 djm 970: chan_read_failed(ssh, c);
971: chan_write_failed(ssh, c);
972: if (c->detach_user) {
973: c->detach_user(ssh,
974: c->self, NULL);
975: }
1.253 dtucker 976: c->type = SSH_CHANNEL_ABANDONED;
1.303 djm 977: buffer_clear(c->input);
978: chan_ibuf_empty(ssh, c);
1.195 djm 979: return 0;
980: } else
981: quit_pending = 1;
1.31 markus 982: return -1;
983:
984: case 'Z' - 64:
1.195 djm 985: /* XXX support this for mux clients */
1.217 djm 986: if (c && c->ctl_chan != -1) {
1.245 dtucker 987: char b[16];
1.195 djm 988: noescape:
1.245 dtucker 989: if (ch == 'Z' - 64)
990: snprintf(b, sizeof b, "^Z");
991: else
992: snprintf(b, sizeof b, "%c", ch);
1.195 djm 993: snprintf(string, sizeof string,
1.245 dtucker 994: "%c%s escape not available to "
1.195 djm 995: "multiplexed sessions\r\n",
1.294 djm 996: efc->escape_char, b);
1.195 djm 997: buffer_append(berr, string,
998: strlen(string));
999: continue;
1000: }
1.197 djm 1001: /* Suspend the program. Inform the user */
1.195 djm 1002: snprintf(string, sizeof string,
1.294 djm 1003: "%c^Z [suspend ssh]\r\n", efc->escape_char);
1.32 markus 1004: buffer_append(berr, string, strlen(string));
1.31 markus 1005:
1006: /* Restore terminal modes and suspend. */
1007: client_suspend_self(bin, bout, berr);
1008:
1009: /* We have been continued. */
1010: continue;
1011:
1.111 markus 1012: case 'B':
1.292 djm 1013: snprintf(string, sizeof string,
1.294 djm 1014: "%cB\r\n", efc->escape_char);
1.292 djm 1015: buffer_append(berr, string, strlen(string));
1.303 djm 1016: channel_request_start(ssh, c->self, "break", 0);
1.292 djm 1017: packet_put_int(1000);
1018: packet_send();
1.111 markus 1019: continue;
1020:
1.54 markus 1021: case 'R':
1.292 djm 1022: if (datafellows & SSH_BUG_NOREKEY)
1023: logit("Server does not "
1024: "support re-keying");
1025: else
1026: need_rekeying = 1;
1.54 markus 1027: continue;
1028:
1.242 dtucker 1029: case 'V':
1030: /* FALLTHROUGH */
1031: case 'v':
1032: if (c && c->ctl_chan != -1)
1033: goto noescape;
1034: if (!log_is_on_stderr()) {
1035: snprintf(string, sizeof string,
1036: "%c%c [Logging to syslog]\r\n",
1.294 djm 1037: efc->escape_char, ch);
1.242 dtucker 1038: buffer_append(berr, string,
1039: strlen(string));
1040: continue;
1041: }
1042: if (ch == 'V' && options.log_level >
1043: SYSLOG_LEVEL_QUIET)
1044: log_change_level(--options.log_level);
1045: if (ch == 'v' && options.log_level <
1046: SYSLOG_LEVEL_DEBUG3)
1047: log_change_level(++options.log_level);
1048: snprintf(string, sizeof string,
1.294 djm 1049: "%c%c [LogLevel %s]\r\n",
1050: efc->escape_char, ch,
1.242 dtucker 1051: log_level_name(options.log_level));
1052: buffer_append(berr, string, strlen(string));
1053: continue;
1054:
1.31 markus 1055: case '&':
1.217 djm 1056: if (c && c->ctl_chan != -1)
1.195 djm 1057: goto noescape;
1.31 markus 1058: /*
1.197 djm 1059: * Detach the program (continue to serve
1060: * connections, but put in background and no
1061: * more new connections).
1.31 markus 1062: */
1063: /* Restore tty modes. */
1.233 djm 1064: leave_raw_mode(
1065: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1066:
1067: /* Stop listening for new connections. */
1.303 djm 1068: channel_stop_listening(ssh);
1.31 markus 1069:
1.86 markus 1070: snprintf(string, sizeof string,
1.294 djm 1071: "%c& [backgrounded]\n", efc->escape_char);
1.86 markus 1072: buffer_append(berr, string, strlen(string));
1.31 markus 1073:
1074: /* Fork into background. */
1075: pid = fork();
1076: if (pid < 0) {
1077: error("fork: %.100s", strerror(errno));
1078: continue;
1079: }
1080: if (pid != 0) { /* This is the parent. */
1081: /* The parent just exits. */
1082: exit(0);
1083: }
1084: /* The child continues serving connections. */
1.292 djm 1085: buffer_append(bin, "\004", 1);
1086: /* fake EOF on stdin */
1087: return -1;
1.31 markus 1088: case '?':
1.294 djm 1089: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1090: (c && c->ctl_chan != -1),
1091: log_is_on_stderr());
1.31 markus 1092: continue;
1093:
1094: case '#':
1.195 djm 1095: snprintf(string, sizeof string, "%c#\r\n",
1.294 djm 1096: efc->escape_char);
1.32 markus 1097: buffer_append(berr, string, strlen(string));
1.303 djm 1098: s = channel_open_message(ssh);
1.31 markus 1099: buffer_append(berr, s, strlen(s));
1.250 djm 1100: free(s);
1.97 jakob 1101: continue;
1102:
1103: case 'C':
1.217 djm 1104: if (c && c->ctl_chan != -1)
1.206 djm 1105: goto noescape;
1.303 djm 1106: process_cmdline(ssh);
1.31 markus 1107: continue;
1108:
1109: default:
1.294 djm 1110: if (ch != efc->escape_char) {
1111: buffer_put_char(bin, efc->escape_char);
1.31 markus 1112: bytes++;
1113: }
1114: /* Escaped characters fall through here */
1115: break;
1116: }
1117: } else {
1118: /*
1.197 djm 1119: * The previous character was not an escape char.
1120: * Check if this is an escape.
1.31 markus 1121: */
1.294 djm 1122: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1123: /*
1124: * It is. Set the flag and continue to
1125: * next character.
1126: */
1.294 djm 1127: efc->escape_pending = 1;
1.31 markus 1128: continue;
1129: }
1130: }
1131:
1132: /*
1133: * Normal character. Record whether it was a newline,
1134: * and append it to the buffer.
1135: */
1136: last_was_cr = (ch == '\r' || ch == '\n');
1137: buffer_put_char(bin, ch);
1138: bytes++;
1139: }
1140: return bytes;
1141: }
1142:
1.13 markus 1143: /*
1.15 markus 1144: * Get packets from the connection input buffer, and process them as long as
1145: * there are packets available.
1146: *
1147: * Any unknown packets received during the actual
1148: * session cause the session to terminate. This is
1149: * intended to make debugging easier since no
1150: * confirmations are sent. Any compatible protocol
1151: * extensions must be negotiated during the
1152: * preparatory phase.
1153: */
1154:
1.77 itojun 1155: static void
1.49 itojun 1156: client_process_buffered_input_packets(void)
1.15 markus 1157: {
1.298 markus 1158: ssh_dispatch_run_fatal(active_state, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1159: }
1160:
1.31 markus 1161: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1162:
1.195 djm 1163: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1164: void *
1165: client_new_escape_filter_ctx(int escape_char)
1166: {
1167: struct escape_filter_ctx *ret;
1168:
1.255 djm 1169: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1170: ret->escape_pending = 0;
1171: ret->escape_char = escape_char;
1172: return (void *)ret;
1173: }
1174:
1.198 djm 1175: /* Free the escape filter context on channel free */
1176: void
1.303 djm 1177: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1178: {
1.250 djm 1179: free(ctx);
1.198 djm 1180: }
1181:
1.195 djm 1182: int
1.303 djm 1183: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1184: {
1.190 djm 1185: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1186: return 0;
1187:
1.303 djm 1188: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1189: buf, len);
1.30 markus 1190: }
1191:
1.77 itojun 1192: static void
1.303 djm 1193: client_channel_closed(struct ssh *ssh, int id, void *arg)
1.60 markus 1194: {
1.303 djm 1195: channel_cancel_cleanup(ssh, id);
1.60 markus 1196: session_closed = 1;
1.233 djm 1197: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1198: }
1199:
1.15 markus 1200: /*
1.13 markus 1201: * Implements the interactive session with the server. This is called after
1202: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1203: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1204: * used as an escape character for terminating or suspending the session.
1.13 markus 1205: */
1.20 markus 1206: int
1.303 djm 1207: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1208: int ssh2_chan_id)
1.1 deraadt 1209: {
1.46 markus 1210: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1211: double start_time, total_time;
1.284 djm 1212: int r, max_fd = 0, max_fd2 = 0, len;
1.200 markus 1213: u_int64_t ibytes, obytes;
1.130 avsm 1214: u_int nalloc = 0;
1.11 markus 1215: char buf[100];
1216:
1217: debug("Entering interactive session.");
1.277 semarie 1218:
1.278 semarie 1219: if (options.control_master &&
1.286 djm 1220: !option_clear_or_none(options.control_path)) {
1.278 semarie 1221: debug("pledge: id");
1.285 tb 1222: if (pledge("stdio rpath wpath cpath unix inet dns recvfd proc exec id tty",
1.278 semarie 1223: NULL) == -1)
1224: fatal("%s pledge(): %s", __func__, strerror(errno));
1225:
1226: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1227: debug("pledge: exec");
1228: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1229: NULL) == -1)
1230: fatal("%s pledge(): %s", __func__, strerror(errno));
1231:
1232: } else if (options.update_hostkeys) {
1233: debug("pledge: filesystem full");
1234: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1235: NULL) == -1)
1236: fatal("%s pledge(): %s", __func__, strerror(errno));
1237:
1.286 djm 1238: } else if (!option_clear_or_none(options.proxy_command) ||
1239: fork_after_authentication_flag) {
1.277 semarie 1240: debug("pledge: proc");
1241: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1242: fatal("%s pledge(): %s", __func__, strerror(errno));
1243:
1244: } else {
1245: debug("pledge: network");
1.300 mestre 1246: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.277 semarie 1247: fatal("%s pledge(): %s", __func__, strerror(errno));
1248: }
1.11 markus 1249:
1250: start_time = get_current_time();
1251:
1252: /* Initialize variables. */
1253: last_was_cr = 1;
1254: exit_status = -1;
1255: connection_in = packet_get_connection_in();
1256: connection_out = packet_get_connection_out();
1.287 deraadt 1257: max_fd = MAXIMUM(connection_in, connection_out);
1.46 markus 1258:
1.11 markus 1259: quit_pending = 0;
1260:
1261: /* Initialize buffers. */
1262: buffer_init(&stderr_buffer);
1263:
1.15 markus 1264: client_init_dispatch();
1265:
1.105 markus 1266: /*
1267: * Set signal handlers, (e.g. to restore non-blocking mode)
1268: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1269: */
1.131 djm 1270: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1271: signal(SIGHUP, signal_handler);
1.105 markus 1272: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1273: signal(SIGINT, signal_handler);
1274: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1275: signal(SIGQUIT, signal_handler);
1276: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1277: signal(SIGTERM, signal_handler);
1.132 djm 1278: signal(SIGWINCH, window_change_handler);
1.11 markus 1279:
1280: if (have_pty)
1.233 djm 1281: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1282:
1.292 djm 1283: session_ident = ssh2_chan_id;
1284: if (session_ident != -1) {
1285: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1286: channel_register_filter(ssh, session_ident,
1.292 djm 1287: client_simple_escape_filter, NULL,
1288: client_filter_cleanup,
1289: client_new_escape_filter_ctx(
1290: escape_char_arg));
1.232 djm 1291: }
1.303 djm 1292: channel_register_cleanup(ssh, session_ident,
1.292 djm 1293: client_channel_closed, 0);
1.48 markus 1294: }
1.30 markus 1295:
1.11 markus 1296: /* Main loop of the client for the interactive session mode. */
1297: while (!quit_pending) {
1298:
1.13 markus 1299: /* Process buffered packets sent by the server. */
1.11 markus 1300: client_process_buffered_input_packets();
1301:
1.303 djm 1302: if (session_closed && !channel_still_open(ssh))
1.60 markus 1303: break;
1304:
1.303 djm 1305: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1306: debug("rekeying in progress");
1.284 djm 1307: } else if (need_rekeying) {
1308: /* manual rekey request */
1309: debug("need rekeying");
1.303 djm 1310: if ((r = kex_start_rekex(ssh)) != 0)
1.284 djm 1311: fatal("%s: kex_start_rekex: %s", __func__,
1312: ssh_err(r));
1313: need_rekeying = 0;
1.56 markus 1314: } else {
1315: /*
1316: * Make packets from buffered channel data, and
1317: * enqueue them for sending to the server.
1318: */
1319: if (packet_not_very_much_data_to_write())
1.303 djm 1320: channel_output_poll(ssh);
1.11 markus 1321:
1.56 markus 1322: /*
1323: * Check if the window size has changed, and buffer a
1324: * message about it to the server if so.
1325: */
1.303 djm 1326: client_check_window_change(ssh);
1.11 markus 1327:
1.56 markus 1328: if (quit_pending)
1329: break;
1330: }
1.13 markus 1331: /*
1332: * Wait until we have something to do (something becomes
1333: * available on one of the descriptors).
1334: */
1.81 markus 1335: max_fd2 = max_fd;
1.303 djm 1336: client_wait_until_can_do_something(ssh, &readset, &writeset,
1337: &max_fd2, &nalloc, ssh_packet_is_rekeying(ssh));
1.11 markus 1338:
1339: if (quit_pending)
1340: break;
1341:
1.56 markus 1342: /* Do channel operations unless rekeying in progress. */
1.303 djm 1343: if (!ssh_packet_is_rekeying(ssh))
1344: channel_after_select(ssh, readset, writeset);
1.11 markus 1345:
1.17 markus 1346: /* Buffer input from the connection. */
1.46 markus 1347: client_process_net_input(readset);
1.17 markus 1348:
1349: if (quit_pending)
1350: break;
1.11 markus 1351:
1.197 djm 1352: /*
1353: * Send as much buffered packet data as possible to the
1354: * sender.
1355: */
1.46 markus 1356: if (FD_ISSET(connection_out, writeset))
1.11 markus 1357: packet_write_poll();
1.222 djm 1358:
1359: /*
1360: * If we are a backgrounded control master, and the
1361: * timeout has expired without any active client
1362: * connections, then quit.
1363: */
1364: if (control_persist_exit_time > 0) {
1.251 dtucker 1365: if (monotime() >= control_persist_exit_time) {
1.222 djm 1366: debug("ControlPersist timeout expired");
1367: break;
1368: }
1369: }
1.11 markus 1370: }
1.250 djm 1371: free(readset);
1372: free(writeset);
1.11 markus 1373:
1374: /* Terminate the session. */
1375:
1376: /* Stop watching for window change. */
1.132 djm 1377: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1378:
1.292 djm 1379: packet_start(SSH2_MSG_DISCONNECT);
1380: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1381: packet_put_cstring("disconnected by user");
1382: packet_put_cstring(""); /* language tag */
1383: packet_send();
1384: packet_write_wait();
1.11 markus 1385:
1.303 djm 1386: channel_free_all(ssh);
1.11 markus 1387:
1.75 markus 1388: if (have_pty)
1.233 djm 1389: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1390:
1391: /* restore blocking io */
1392: if (!isatty(fileno(stdin)))
1393: unset_nonblock(fileno(stdin));
1394: if (!isatty(fileno(stdout)))
1395: unset_nonblock(fileno(stdout));
1396: if (!isatty(fileno(stderr)))
1397: unset_nonblock(fileno(stderr));
1.116 dtucker 1398:
1399: /*
1400: * If there was no shell or command requested, there will be no remote
1401: * exit status to be returned. In that case, clear error code if the
1402: * connection was deliberately terminated at this end.
1403: */
1404: if (no_shell_flag && received_signal == SIGTERM) {
1405: received_signal = 0;
1406: exit_status = 0;
1407: }
1.75 markus 1408:
1.301 dtucker 1409: if (received_signal) {
1410: verbose("Killed by signal %d.", (int) received_signal);
1411: cleanup_exit(0);
1412: }
1.75 markus 1413:
1.13 markus 1414: /*
1415: * In interactive mode (with pseudo tty) display a message indicating
1416: * that the connection has been closed.
1417: */
1.11 markus 1418: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1419: snprintf(buf, sizeof buf,
1420: "Connection to %.64s closed.\r\n", host);
1.11 markus 1421: buffer_append(&stderr_buffer, buf, strlen(buf));
1422: }
1.70 markus 1423:
1.11 markus 1424: /* Output any buffered data for stderr. */
1.231 djm 1425: if (buffer_len(&stderr_buffer) > 0) {
1.230 djm 1426: len = atomicio(vwrite, fileno(stderr),
1427: buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1.231 djm 1428: if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1.11 markus 1429: error("Write failed flushing stderr buffer.");
1.231 djm 1430: else
1431: buffer_consume(&stderr_buffer, len);
1.11 markus 1432: }
1433:
1434: /* Clear and free any buffers. */
1.281 jsg 1435: explicit_bzero(buf, sizeof(buf));
1.11 markus 1436: buffer_free(&stderr_buffer);
1437:
1438: /* Report bytes transferred, and transfer rates. */
1439: total_time = get_current_time() - start_time;
1.263 markus 1440: packet_get_bytes(&ibytes, &obytes);
1.200 markus 1441: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1442: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1443: if (total_time > 0)
1.200 markus 1444: verbose("Bytes per second: sent %.1f, received %.1f",
1445: obytes / total_time, ibytes / total_time);
1.11 markus 1446: /* Return the exit status of the program. */
1447: debug("Exit status %d", exit_status);
1448: return exit_status;
1.15 markus 1449: }
1450:
1451: /*********/
1452:
1.77 itojun 1453: static Channel *
1.303 djm 1454: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1455: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1456: {
1.103 deraadt 1457: Channel *c = NULL;
1.289 markus 1458: struct sshbuf *b = NULL;
1.40 markus 1459: char *listen_address, *originator_address;
1.208 djm 1460: u_short listen_port, originator_port;
1.289 markus 1461: int r;
1.40 markus 1462:
1463: /* Get rest of the packet */
1464: listen_address = packet_get_string(NULL);
1465: listen_port = packet_get_int();
1466: originator_address = packet_get_string(NULL);
1467: originator_port = packet_get_int();
1.93 markus 1468: packet_check_eom();
1.40 markus 1469:
1.261 millert 1470: debug("%s: listen %s port %d, originator %s port %d", __func__,
1471: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1472:
1.303 djm 1473: c = channel_connect_by_listen_address(ssh, listen_address, listen_port,
1.191 djm 1474: "forwarded-tcpip", originator_address);
1.40 markus 1475:
1.289 markus 1476: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1477: if ((b = sshbuf_new()) == NULL) {
1478: error("%s: alloc reply", __func__);
1479: goto out;
1480: }
1481: /* reconstruct and send to muxclient */
1482: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1483: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1484: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1485: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1486: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1487: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1488: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1489: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1490: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1491: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1492: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.289 markus 1493: error("%s: compose for muxclient %s", __func__,
1494: ssh_err(r));
1495: goto out;
1496: }
1497: }
1498:
1499: out:
1500: sshbuf_free(b);
1.250 djm 1501: free(originator_address);
1502: free(listen_address);
1.40 markus 1503: return c;
1504: }
1505:
1.103 deraadt 1506: static Channel *
1.303 djm 1507: client_request_forwarded_streamlocal(struct ssh *ssh,
1508: const char *request_type, int rchan)
1.261 millert 1509: {
1510: Channel *c = NULL;
1511: char *listen_path;
1512:
1513: /* Get the remote path. */
1514: listen_path = packet_get_string(NULL);
1515: /* XXX: Skip reserved field for now. */
1516: if (packet_get_string_ptr(NULL) == NULL)
1517: fatal("%s: packet_get_string_ptr failed", __func__);
1518: packet_check_eom();
1519:
1520: debug("%s: %s", __func__, listen_path);
1521:
1.303 djm 1522: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1523: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1524: free(listen_path);
1525: return c;
1526: }
1527:
1528: static Channel *
1.303 djm 1529: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1530: {
1531: Channel *c = NULL;
1532: char *originator;
1.208 djm 1533: u_short originator_port;
1.67 markus 1534: int sock;
1.40 markus 1535:
1536: if (!options.forward_x11) {
1537: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1538: error("Warning: this is probably a break-in attempt by a "
1539: "malicious server.");
1.221 djm 1540: return NULL;
1541: }
1.274 djm 1542: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1543: verbose("Rejected X11 connection after ForwardX11Timeout "
1544: "expired");
1.40 markus 1545: return NULL;
1546: }
1547: originator = packet_get_string(NULL);
1548: if (datafellows & SSH_BUG_X11FWD) {
1549: debug2("buggy server: x11 request w/o originator_port");
1550: originator_port = 0;
1551: } else {
1552: originator_port = packet_get_int();
1553: }
1.93 markus 1554: packet_check_eom();
1.40 markus 1555: /* XXX check permission */
1.47 markus 1556: debug("client_request_x11: request from %s %d", originator,
1557: originator_port);
1.250 djm 1558: free(originator);
1.303 djm 1559: sock = x11_connect_display(ssh);
1.67 markus 1560: if (sock < 0)
1561: return NULL;
1.303 djm 1562: c = channel_new(ssh, "x11",
1.67 markus 1563: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1564: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1565: c->force_drain = 1;
1.40 markus 1566: return c;
1567: }
1568:
1.103 deraadt 1569: static Channel *
1.303 djm 1570: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1571: {
1572: Channel *c = NULL;
1.262 djm 1573: int r, sock;
1.40 markus 1574:
1575: if (!options.forward_agent) {
1576: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1577: error("Warning: this is probably a break-in attempt by a "
1578: "malicious server.");
1.40 markus 1579: return NULL;
1580: }
1.262 djm 1581: if ((r = ssh_get_authentication_socket(&sock)) != 0) {
1582: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1583: debug("%s: ssh_get_authentication_socket: %s",
1584: __func__, ssh_err(r));
1.67 markus 1585: return NULL;
1.262 djm 1586: }
1.303 djm 1587: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1588: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1589: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1590: "authentication agent connection", 1);
1.82 markus 1591: c->force_drain = 1;
1.40 markus 1592: return c;
1.180 djm 1593: }
1594:
1595: int
1.303 djm 1596: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1597: int local_tun, int remote_tun)
1.180 djm 1598: {
1599: Channel *c;
1600: int fd;
1601:
1602: if (tun_mode == SSH_TUNMODE_NO)
1603: return 0;
1604:
1605: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1606:
1607: /* Open local tunnel device */
1608: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1609: error("Tunnel device open failed.");
1610: return -1;
1611: }
1612:
1.303 djm 1613: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1614: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1615: c->datagram = 1;
1616:
1617: packet_start(SSH2_MSG_CHANNEL_OPEN);
1618: packet_put_cstring("tun@openssh.com");
1619: packet_put_int(c->self);
1620: packet_put_int(c->local_window_max);
1621: packet_put_int(c->local_maxpacket);
1622: packet_put_int(tun_mode);
1623: packet_put_int(remote_tun);
1624: packet_send();
1625:
1626: return 0;
1.40 markus 1627: }
1628:
1.22 markus 1629: /* XXXX move to generic input handler */
1.264 markus 1630: static int
1.297 markus 1631: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1632: {
1633: Channel *c = NULL;
1634: char *ctype;
1635: int rchan;
1.102 markus 1636: u_int rmaxpack, rwindow, len;
1.22 markus 1637:
1638: ctype = packet_get_string(&len);
1639: rchan = packet_get_int();
1640: rwindow = packet_get_int();
1641: rmaxpack = packet_get_int();
1642:
1.24 markus 1643: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1644: ctype, rchan, rwindow, rmaxpack);
1645:
1.40 markus 1646: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1647: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1648: rmaxpack);
1.261 millert 1649: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1650: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1651: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1652: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1653: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1654: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1655: }
1.289 markus 1656: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1657: debug3("proxied to downstream: %s", ctype);
1658: } else if (c != NULL) {
1.22 markus 1659: debug("confirm %s", ctype);
1660: c->remote_id = rchan;
1.304 djm 1661: c->have_remote_id = 1;
1.22 markus 1662: c->remote_window = rwindow;
1663: c->remote_maxpacket = rmaxpack;
1.69 markus 1664: if (c->type != SSH_CHANNEL_CONNECTING) {
1665: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1666: packet_put_int(c->remote_id);
1667: packet_put_int(c->self);
1668: packet_put_int(c->local_window);
1669: packet_put_int(c->local_maxpacket);
1670: packet_send();
1671: }
1.22 markus 1672: } else {
1673: debug("failure %s", ctype);
1674: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1675: packet_put_int(rchan);
1676: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1677: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1678: packet_put_cstring("open failed");
1.66 markus 1679: packet_put_cstring("");
1680: }
1.22 markus 1681: packet_send();
1682: }
1.250 djm 1683: free(ctype);
1.264 markus 1684: return 0;
1.22 markus 1685: }
1.267 djm 1686:
1.264 markus 1687: static int
1.297 markus 1688: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1689: {
1690: Channel *c = NULL;
1.123 djm 1691: int exitval, id, reply, success = 0;
1.48 markus 1692: char *rtype;
1693:
1694: id = packet_get_int();
1.303 djm 1695: c = channel_lookup(ssh, id);
1.297 markus 1696: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1697: return 0;
1.48 markus 1698: rtype = packet_get_string(NULL);
1699: reply = packet_get_char();
1700:
1701: debug("client_input_channel_req: channel %d rtype %s reply %d",
1702: id, rtype, reply);
1703:
1.128 djm 1704: if (id == -1) {
1705: error("client_input_channel_req: request for channel -1");
1.289 markus 1706: } else if (c == NULL) {
1.197 djm 1707: error("client_input_channel_req: channel %d: "
1708: "unknown channel", id);
1.193 markus 1709: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1710: packet_check_eom();
1.303 djm 1711: chan_rcvd_eow(ssh, c);
1.48 markus 1712: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1713: exitval = packet_get_int();
1.217 djm 1714: if (c->ctl_chan != -1) {
1.303 djm 1715: mux_exit_message(ssh, c, exitval);
1.215 djm 1716: success = 1;
1717: } else if (id == session_ident) {
1718: /* Record exit value of local session */
1.123 djm 1719: success = 1;
1720: exit_status = exitval;
1.215 djm 1721: } else {
1.218 djm 1722: /* Probably for a mux channel that has already closed */
1723: debug("%s: no sink for exit-status on channel %d",
1724: __func__, id);
1.123 djm 1725: }
1.93 markus 1726: packet_check_eom();
1.48 markus 1727: }
1.259 djm 1728: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1729: if (!c->have_remote_id)
1730: fatal("%s: channel %d: no remote_id",
1731: __func__, c->self);
1.48 markus 1732: packet_start(success ?
1733: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 1734: packet_put_int(c->remote_id);
1.48 markus 1735: packet_send();
1736: }
1.250 djm 1737: free(rtype);
1.264 markus 1738: return 0;
1.48 markus 1739: }
1.267 djm 1740:
1.269 djm 1741: struct hostkeys_update_ctx {
1742: /* The hostname and (optionally) IP address string for the server */
1743: char *host_str, *ip_str;
1744:
1745: /*
1746: * Keys received from the server and a flag for each indicating
1747: * whether they already exist in known_hosts.
1748: * keys_seen is filled in by hostkeys_find() and later (for new
1749: * keys) by client_global_hostkeys_private_confirm().
1750: */
1751: struct sshkey **keys;
1752: int *keys_seen;
1.294 djm 1753: size_t nkeys, nnew;
1.269 djm 1754:
1755: /*
1756: * Keys that are in known_hosts, but were not present in the update
1757: * from the server (i.e. scheduled to be deleted).
1758: * Filled in by hostkeys_find().
1759: */
1760: struct sshkey **old_keys;
1761: size_t nold;
1762: };
1763:
1764: static void
1765: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1766: {
1767: size_t i;
1768:
1769: if (ctx == NULL)
1770: return;
1771: for (i = 0; i < ctx->nkeys; i++)
1772: sshkey_free(ctx->keys[i]);
1773: free(ctx->keys);
1774: free(ctx->keys_seen);
1775: for (i = 0; i < ctx->nold; i++)
1776: sshkey_free(ctx->old_keys[i]);
1777: free(ctx->old_keys);
1778: free(ctx->host_str);
1779: free(ctx->ip_str);
1780: free(ctx);
1781: }
1782:
1783: static int
1784: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1785: {
1786: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1787: size_t i;
1788: struct sshkey **tmp;
1789:
1.293 djm 1790: if (l->status != HKF_STATUS_MATCHED || l->key == NULL)
1.269 djm 1791: return 0;
1792:
1793: /* Mark off keys we've already seen for this host */
1794: for (i = 0; i < ctx->nkeys; i++) {
1795: if (sshkey_equal(l->key, ctx->keys[i])) {
1796: debug3("%s: found %s key at %s:%ld", __func__,
1797: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1798: ctx->keys_seen[i] = 1;
1799: return 0;
1800: }
1801: }
1802: /* This line contained a key that not offered by the server */
1803: debug3("%s: deprecated %s key at %s:%ld", __func__,
1804: sshkey_ssh_name(l->key), l->path, l->linenum);
1.299 deraadt 1805: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1806: sizeof(*ctx->old_keys))) == NULL)
1.299 deraadt 1807: fatal("%s: recallocarray failed nold = %zu",
1.269 djm 1808: __func__, ctx->nold);
1809: ctx->old_keys = tmp;
1810: ctx->old_keys[ctx->nold++] = l->key;
1811: l->key = NULL;
1812:
1813: return 0;
1814: }
1815:
1816: static void
1817: update_known_hosts(struct hostkeys_update_ctx *ctx)
1818: {
1.271 djm 1819: int r, was_raw = 0;
1820: int loglevel = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK ?
1.269 djm 1821: SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1822: char *fp, *response;
1823: size_t i;
1824:
1825: for (i = 0; i < ctx->nkeys; i++) {
1826: if (ctx->keys_seen[i] != 2)
1827: continue;
1828: if ((fp = sshkey_fingerprint(ctx->keys[i],
1829: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1830: fatal("%s: sshkey_fingerprint failed", __func__);
1831: do_log2(loglevel, "Learned new hostkey: %s %s",
1832: sshkey_type(ctx->keys[i]), fp);
1833: free(fp);
1834: }
1835: for (i = 0; i < ctx->nold; i++) {
1836: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
1837: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1838: fatal("%s: sshkey_fingerprint failed", __func__);
1839: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
1840: sshkey_type(ctx->old_keys[i]), fp);
1841: free(fp);
1842: }
1843: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 1844: if (get_saved_tio() != NULL) {
1845: leave_raw_mode(1);
1846: was_raw = 1;
1847: }
1.269 djm 1848: response = NULL;
1849: for (i = 0; !quit_pending && i < 3; i++) {
1850: free(response);
1851: response = read_passphrase("Accept updated hostkeys? "
1852: "(yes/no): ", RP_ECHO);
1853: if (strcasecmp(response, "yes") == 0)
1854: break;
1855: else if (quit_pending || response == NULL ||
1856: strcasecmp(response, "no") == 0) {
1857: options.update_hostkeys = 0;
1858: break;
1859: } else {
1860: do_log2(loglevel, "Please enter "
1861: "\"yes\" or \"no\"");
1862: }
1863: }
1864: if (quit_pending || i >= 3 || response == NULL)
1865: options.update_hostkeys = 0;
1866: free(response);
1.271 djm 1867: if (was_raw)
1868: enter_raw_mode(1);
1.269 djm 1869: }
1870:
1871: /*
1872: * Now that all the keys are verified, we can go ahead and replace
1873: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
1874: * cancel the operation).
1875: */
1876: if (options.update_hostkeys != 0 &&
1877: (r = hostfile_replace_entries(options.user_hostfiles[0],
1878: ctx->host_str, ctx->ip_str, ctx->keys, ctx->nkeys,
1879: options.hash_known_hosts, 0,
1880: options.fingerprint_hash)) != 0)
1881: error("%s: hostfile_replace_entries failed: %s",
1882: __func__, ssh_err(r));
1883: }
1884:
1885: static void
1.303 djm 1886: client_global_hostkeys_private_confirm(struct ssh *ssh, int type,
1887: u_int32_t seq, void *_ctx)
1.269 djm 1888: {
1889: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1890: size_t i, ndone;
1891: struct sshbuf *signdata;
1892: int r;
1893: const u_char *sig;
1894: size_t siglen;
1895:
1896: if (ctx->nnew == 0)
1897: fatal("%s: ctx->nnew == 0", __func__); /* sanity */
1898: if (type != SSH2_MSG_REQUEST_SUCCESS) {
1899: error("Server failed to confirm ownership of "
1900: "private host keys");
1901: hostkeys_update_ctx_free(ctx);
1902: return;
1903: }
1904: if ((signdata = sshbuf_new()) == NULL)
1905: fatal("%s: sshbuf_new failed", __func__);
1906: /* Don't want to accidentally accept an unbound signature */
1907: if (ssh->kex->session_id_len == 0)
1908: fatal("%s: ssh->kex->session_id_len == 0", __func__);
1909: /*
1910: * Expect a signature for each of the ctx->nnew private keys we
1911: * haven't seen before. They will be in the same order as the
1912: * ctx->keys where the corresponding ctx->keys_seen[i] == 0.
1913: */
1914: for (ndone = i = 0; i < ctx->nkeys; i++) {
1915: if (ctx->keys_seen[i])
1916: continue;
1917: /* Prepare data to be signed: session ID, unique string, key */
1918: sshbuf_reset(signdata);
1.270 djm 1919: if ( (r = sshbuf_put_cstring(signdata,
1920: "hostkeys-prove-00@openssh.com")) != 0 ||
1921: (r = sshbuf_put_string(signdata, ssh->kex->session_id,
1.269 djm 1922: ssh->kex->session_id_len)) != 0 ||
1923: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1924: fatal("%s: failed to prepare signature: %s",
1925: __func__, ssh_err(r));
1926: /* Extract and verify signature */
1927: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1928: error("%s: couldn't parse message: %s",
1929: __func__, ssh_err(r));
1930: goto out;
1931: }
1932: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1933: sshbuf_ptr(signdata), sshbuf_len(signdata), 0)) != 0) {
1934: error("%s: server gave bad signature for %s key %zu",
1935: __func__, sshkey_type(ctx->keys[i]), i);
1936: goto out;
1937: }
1938: /* Key is good. Mark it as 'seen' */
1939: ctx->keys_seen[i] = 2;
1940: ndone++;
1941: }
1942: if (ndone != ctx->nnew)
1943: fatal("%s: ndone != ctx->nnew (%zu / %zu)", __func__,
1944: ndone, ctx->nnew); /* Shouldn't happen */
1945: ssh_packet_check_eom(ssh);
1946:
1947: /* Make the edits to known_hosts */
1948: update_known_hosts(ctx);
1949: out:
1950: hostkeys_update_ctx_free(ctx);
1951: }
1952:
1.267 djm 1953: /*
1.291 djm 1954: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
1955: * Made slightly less trivial by the multiple RSA signature algorithm names.
1956: */
1957: static int
1958: key_accepted_by_hostkeyalgs(const struct sshkey *key)
1959: {
1960: const char *ktype = sshkey_ssh_name(key);
1961: const char *hostkeyalgs = options.hostkeyalgorithms != NULL ?
1962: options.hostkeyalgorithms : KEX_DEFAULT_PK_ALG;
1963:
1964: if (key == NULL || key->type == KEY_UNSPEC)
1965: return 0;
1966: if (key->type == KEY_RSA &&
1967: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
1968: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
1969: return 1;
1970: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
1971: }
1972:
1973: /*
1.270 djm 1974: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 1975: * the server's hostkeys. The keys are checked against the user's
1976: * HostkeyAlgorithms preference before they are accepted.
1977: */
1978: static int
1979: client_input_hostkeys(void)
1980: {
1.269 djm 1981: struct ssh *ssh = active_state; /* XXX */
1.267 djm 1982: const u_char *blob = NULL;
1.269 djm 1983: size_t i, len = 0;
1.267 djm 1984: struct sshbuf *buf = NULL;
1.269 djm 1985: struct sshkey *key = NULL, **tmp;
1986: int r;
1987: char *fp;
1.267 djm 1988: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 1989: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 1990: struct hostkeys_update_ctx *ctx = NULL;
1.267 djm 1991:
1992: if (hostkeys_seen)
1993: fatal("%s: server already sent hostkeys", __func__);
1.269 djm 1994: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
1995: options.batch_mode)
1996: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 1997: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
1998: return 1;
1.272 djm 1999:
2000: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2001: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2002: sshkey_free(key);
2003: key = NULL;
1.269 djm 2004: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
2005: error("%s: couldn't parse message: %s",
2006: __func__, ssh_err(r));
2007: goto out;
2008: }
1.270 djm 2009: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
2010: error("%s: parse key: %s", __func__, ssh_err(r));
2011: goto out;
2012: }
1.267 djm 2013: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2014: SSH_FP_DEFAULT);
2015: debug3("%s: received %s key %s", __func__,
2016: sshkey_type(key), fp);
2017: free(fp);
1.275 markus 2018:
1.291 djm 2019: if (!key_accepted_by_hostkeyalgs(key)) {
1.267 djm 2020: debug3("%s: %s key not permitted by HostkeyAlgorithms",
2021: __func__, sshkey_ssh_name(key));
2022: continue;
2023: }
1.269 djm 2024: /* Skip certs */
2025: if (sshkey_is_cert(key)) {
2026: debug3("%s: %s key is a certificate; skipping",
2027: __func__, sshkey_ssh_name(key));
2028: continue;
2029: }
2030: /* Ensure keys are unique */
2031: for (i = 0; i < ctx->nkeys; i++) {
2032: if (sshkey_equal(key, ctx->keys[i])) {
2033: error("%s: received duplicated %s host key",
2034: __func__, sshkey_ssh_name(key));
2035: goto out;
2036: }
2037: }
2038: /* Key is good, record it */
1.299 deraadt 2039: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2040: sizeof(*ctx->keys))) == NULL)
1.299 deraadt 2041: fatal("%s: recallocarray failed nkeys = %zu",
1.269 djm 2042: __func__, ctx->nkeys);
2043: ctx->keys = tmp;
2044: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2045: key = NULL;
2046: }
2047:
1.269 djm 2048: if (ctx->nkeys == 0) {
1.270 djm 2049: debug("%s: server sent no hostkeys", __func__);
1.267 djm 2050: goto out;
2051: }
1.270 djm 2052:
1.269 djm 2053: if ((ctx->keys_seen = calloc(ctx->nkeys,
2054: sizeof(*ctx->keys_seen))) == NULL)
2055: fatal("%s: calloc failed", __func__);
1.267 djm 2056:
1.268 djm 2057: get_hostfile_hostname_ipaddr(host,
2058: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2059: options.port, &ctx->host_str,
2060: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2061:
1.269 djm 2062: /* Find which keys we already know about. */
2063: if ((r = hostkeys_foreach(options.user_hostfiles[0], hostkeys_find,
2064: ctx, ctx->host_str, ctx->ip_str,
2065: HKF_WANT_PARSE_KEY|HKF_WANT_MATCH)) != 0) {
2066: error("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1.267 djm 2067: goto out;
2068: }
2069:
1.269 djm 2070: /* Figure out if we have any new keys to add */
2071: ctx->nnew = 0;
2072: for (i = 0; i < ctx->nkeys; i++) {
2073: if (!ctx->keys_seen[i])
2074: ctx->nnew++;
2075: }
2076:
2077: debug3("%s: %zu keys from server: %zu new, %zu retained. %zu to remove",
2078: __func__, ctx->nkeys, ctx->nnew, ctx->nkeys - ctx->nnew, ctx->nold);
2079:
2080: if (ctx->nnew == 0 && ctx->nold != 0) {
2081: /* We have some keys to remove. Just do it. */
2082: update_known_hosts(ctx);
2083: } else if (ctx->nnew != 0) {
2084: /*
2085: * We have received hitherto-unseen keys from the server.
2086: * Ask the server to confirm ownership of the private halves.
2087: */
2088: debug3("%s: asking server to prove ownership for %zu keys",
2089: __func__, ctx->nnew);
2090: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2091: (r = sshpkt_put_cstring(ssh,
1.270 djm 2092: "hostkeys-prove-00@openssh.com")) != 0 ||
1.269 djm 2093: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
2094: fatal("%s: cannot prepare packet: %s",
2095: __func__, ssh_err(r));
2096: if ((buf = sshbuf_new()) == NULL)
2097: fatal("%s: sshbuf_new", __func__);
2098: for (i = 0; i < ctx->nkeys; i++) {
2099: if (ctx->keys_seen[i])
2100: continue;
2101: sshbuf_reset(buf);
2102: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0)
2103: fatal("%s: sshkey_putb: %s",
2104: __func__, ssh_err(r));
2105: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
2106: fatal("%s: sshpkt_put_string: %s",
2107: __func__, ssh_err(r));
2108: }
2109: if ((r = sshpkt_send(ssh)) != 0)
2110: fatal("%s: sshpkt_send: %s", __func__, ssh_err(r));
2111: client_register_global_confirm(
2112: client_global_hostkeys_private_confirm, ctx);
2113: ctx = NULL; /* will be freed in callback */
2114: }
2115:
1.267 djm 2116: /* Success */
2117: out:
1.269 djm 2118: hostkeys_update_ctx_free(ctx);
1.267 djm 2119: sshkey_free(key);
2120: sshbuf_free(buf);
1.269 djm 2121: /*
2122: * NB. Return success for all cases. The server doesn't need to know
2123: * what the client does with its hosts file.
2124: */
2125: return 1;
1.267 djm 2126: }
2127:
1.264 markus 2128: static int
1.297 markus 2129: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2130: {
2131: char *rtype;
2132: int want_reply;
2133: int success = 0;
2134:
1.267 djm 2135: rtype = packet_get_cstring(NULL);
1.95 markus 2136: want_reply = packet_get_char();
1.117 markus 2137: debug("client_input_global_request: rtype %s want_reply %d",
2138: rtype, want_reply);
1.270 djm 2139: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.267 djm 2140: success = client_input_hostkeys();
1.95 markus 2141: if (want_reply) {
2142: packet_start(success ?
2143: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
2144: packet_send();
2145: packet_write_wait();
2146: }
1.250 djm 2147: free(rtype);
1.264 markus 2148: return 0;
1.95 markus 2149: }
1.22 markus 2150:
1.123 djm 2151: void
1.303 djm 2152: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.190 djm 2153: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 2154: {
2155: int len;
1.132 djm 2156: Channel *c = NULL;
1.123 djm 2157:
2158: debug2("%s: id %d", __func__, id);
2159:
1.303 djm 2160: if ((c = channel_lookup(ssh, id)) == NULL)
2161: fatal("%s: channel %d: unknown channel", __func__, id);
1.224 djm 2162:
2163: packet_set_interactive(want_tty,
2164: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2165:
1.123 djm 2166: if (want_tty) {
2167: struct winsize ws;
2168:
2169: /* Store window size in the packet. */
2170: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2171: memset(&ws, 0, sizeof(ws));
2172:
1.303 djm 2173: channel_request_start(ssh, id, "pty-req", 1);
2174: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.123 djm 2175: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 2176: packet_put_int((u_int)ws.ws_col);
2177: packet_put_int((u_int)ws.ws_row);
2178: packet_put_int((u_int)ws.ws_xpixel);
2179: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 2180: if (tiop == NULL)
2181: tiop = get_saved_tio();
2182: tty_make_modes(-1, tiop);
1.123 djm 2183: packet_send();
2184: /* XXX wait for reply */
1.132 djm 2185: c->client_tty = 1;
1.123 djm 2186: }
2187:
2188: /* Transfer any environment variables from client to server */
1.126 djm 2189: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2190: int i, j, matched;
2191: char *name, *val;
2192:
2193: debug("Sending environment.");
1.126 djm 2194: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2195: /* Split */
1.126 djm 2196: name = xstrdup(env[i]);
1.123 djm 2197: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2198: free(name);
1.123 djm 2199: continue;
2200: }
2201: *val++ = '\0';
2202:
2203: matched = 0;
2204: for (j = 0; j < options.num_send_env; j++) {
2205: if (match_pattern(name, options.send_env[j])) {
2206: matched = 1;
2207: break;
2208: }
2209: }
2210: if (!matched) {
2211: debug3("Ignored env %s", name);
1.250 djm 2212: free(name);
1.123 djm 2213: continue;
2214: }
2215:
2216: debug("Sending env %s = %s", name, val);
1.303 djm 2217: channel_request_start(ssh, id, "env", 0);
1.123 djm 2218: packet_put_cstring(name);
2219: packet_put_cstring(val);
2220: packet_send();
1.250 djm 2221: free(name);
1.123 djm 2222: }
2223: }
2224:
2225: len = buffer_len(cmd);
2226: if (len > 0) {
2227: if (len > 900)
2228: len = 900;
2229: if (want_subsystem) {
1.190 djm 2230: debug("Sending subsystem: %.*s",
2231: len, (u_char*)buffer_ptr(cmd));
1.303 djm 2232: channel_request_start(ssh, id, "subsystem", 1);
2233: client_expect_confirm(ssh, id, "subsystem",
2234: CONFIRM_CLOSE);
1.123 djm 2235: } else {
1.190 djm 2236: debug("Sending command: %.*s",
2237: len, (u_char*)buffer_ptr(cmd));
1.303 djm 2238: channel_request_start(ssh, id, "exec", 1);
2239: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2240: }
2241: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2242: packet_send();
2243: } else {
1.303 djm 2244: channel_request_start(ssh, id, "shell", 1);
2245: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.123 djm 2246: packet_send();
2247: }
2248: }
2249:
1.77 itojun 2250: static void
1.292 djm 2251: client_init_dispatch(void)
1.16 markus 2252: {
1.55 markus 2253: dispatch_init(&dispatch_protocol_error);
1.100 markus 2254:
1.16 markus 2255: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2256: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2257: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2258: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2259: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2260: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2261: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2262: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2263: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2264: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2265: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2266: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2267:
2268: /* rekeying */
2269: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2270:
2271: /* global request reply messages */
2272: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2273: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2274: }
2275:
2276: void
2277: client_stop_mux(void)
2278: {
2279: if (options.control_path != NULL && muxserver_sock != -1)
2280: unlink(options.control_path);
2281: /*
1.247 dtucker 2282: * If we are in persist mode, or don't have a shell, signal that we
2283: * should close when all active channels are closed.
1.232 djm 2284: */
1.247 dtucker 2285: if (options.control_persist || no_shell_flag) {
1.232 djm 2286: session_closed = 1;
1.235 djm 2287: setproctitle("[stopped mux]");
2288: }
1.113 markus 2289: }
2290:
2291: /* client specific fatal cleanup */
2292: void
1.114 markus 2293: cleanup_exit(int i)
1.113 markus 2294: {
1.233 djm 2295: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2296: leave_non_blocking();
1.192 djm 2297: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2298: unlink(options.control_path);
1.223 djm 2299: ssh_kill_proxy_command();
1.114 markus 2300: _exit(i);
1.1 deraadt 2301: }
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