Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.313
1.313 ! djm 1: /* $OpenBSD: clientloop.c,v 1.312 2018/04/10 00:10:49 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;
1.1 deraadt 205: }
206:
1.13 markus 207: /*
208: * Signal handler for signals that cause the program to terminate. These
209: * signals must be trapped to restore terminal modes.
210: */
1.157 deraadt 211: /*ARGSUSED */
1.77 itojun 212: static void
1.11 markus 213: signal_handler(int sig)
1.1 deraadt 214: {
1.75 markus 215: received_signal = sig;
216: quit_pending = 1;
1.1 deraadt 217: }
218:
1.13 markus 219: /*
1.222 djm 220: * Sets control_persist_exit_time to the absolute time when the
221: * backgrounded control master should exit due to expiry of the
222: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
223: * control master process, or if there is no ControlPersist timeout.
224: */
225: static void
1.303 djm 226: set_control_persist_exit_time(struct ssh *ssh)
1.222 djm 227: {
228: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 229: || options.control_persist_timeout == 0) {
1.222 djm 230: /* not using a ControlPersist timeout */
231: control_persist_exit_time = 0;
1.303 djm 232: } else if (channel_still_open(ssh)) {
1.222 djm 233: /* some client connections are still open */
234: if (control_persist_exit_time > 0)
235: debug2("%s: cancel scheduled exit", __func__);
236: control_persist_exit_time = 0;
237: } else if (control_persist_exit_time <= 0) {
238: /* a client connection has recently closed */
1.251 dtucker 239: control_persist_exit_time = monotime() +
1.222 djm 240: (time_t)options.control_persist_timeout;
241: debug2("%s: schedule exit in %d seconds", __func__,
242: options.control_persist_timeout);
243: }
244: /* else we are already counting down to the timeout */
245: }
246:
1.238 dtucker 247: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
248: static int
249: client_x11_display_valid(const char *display)
250: {
251: size_t i, dlen;
252:
1.279 djm 253: if (display == NULL)
254: return 0;
255:
1.238 dtucker 256: dlen = strlen(display);
257: for (i = 0; i < dlen; i++) {
1.256 deraadt 258: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 259: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
260: debug("Invalid character '%c' in DISPLAY", display[i]);
261: return 0;
262: }
263: }
264: return 1;
265: }
266:
1.274 djm 267: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
268: #define X11_TIMEOUT_SLACK 60
1.279 djm 269: int
1.303 djm 270: client_x11_get_proto(struct ssh *ssh, const char *display,
271: const char *xauth_path, u_int trusted, u_int timeout,
272: char **_proto, char **_data)
1.138 djm 273: {
1.279 djm 274: char cmd[1024], line[512], xdisplay[512];
275: char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
1.138 djm 276: static char proto[512], data[512];
277: FILE *f;
1.288 tedu 278: int got_data = 0, generated = 0, do_unlink = 0, r;
1.138 djm 279: struct stat st;
1.274 djm 280: u_int now, x11_timeout_real;
1.138 djm 281:
282: *_proto = proto;
283: *_data = data;
1.279 djm 284: proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
1.138 djm 285:
1.279 djm 286: if (!client_x11_display_valid(display)) {
1.283 millert 287: if (display != NULL)
288: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
289: display);
1.279 djm 290: return -1;
291: }
292: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
1.138 djm 293: debug("No xauth program.");
1.279 djm 294: xauth_path = NULL;
295: }
296:
297: if (xauth_path != NULL) {
1.138 djm 298: /*
299: * Handle FamilyLocal case where $DISPLAY does
300: * not match an authorization entry. For this we
301: * just try "xauth list unix:displaynum.screennum".
302: * XXX: "localhost" match to determine FamilyLocal
303: * is not perfect.
304: */
305: if (strncmp(display, "localhost:", 10) == 0) {
1.279 djm 306: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
307: display + 10)) < 0 ||
308: (size_t)r >= sizeof(xdisplay)) {
309: error("%s: display name too long", __func__);
310: return -1;
311: }
1.138 djm 312: display = xdisplay;
313: }
314: if (trusted == 0) {
1.274 djm 315: /*
1.279 djm 316: * Generate an untrusted X11 auth cookie.
317: *
1.274 djm 318: * The authentication cookie should briefly outlive
319: * ssh's willingness to forward X11 connections to
320: * avoid nasty fail-open behaviour in the X server.
321: */
1.279 djm 322: mktemp_proto(xauthdir, sizeof(xauthdir));
323: if (mkdtemp(xauthdir) == NULL) {
324: error("%s: mkdtemp: %s",
325: __func__, strerror(errno));
326: return -1;
327: }
328: do_unlink = 1;
329: if ((r = snprintf(xauthfile, sizeof(xauthfile),
330: "%s/xauthfile", xauthdir)) < 0 ||
331: (size_t)r >= sizeof(xauthfile)) {
332: error("%s: xauthfile path too long", __func__);
333: unlink(xauthfile);
334: rmdir(xauthdir);
335: return -1;
336: }
337:
1.274 djm 338: if (timeout >= UINT_MAX - X11_TIMEOUT_SLACK)
339: x11_timeout_real = UINT_MAX;
340: else
341: x11_timeout_real = timeout + X11_TIMEOUT_SLACK;
1.279 djm 342: if ((r = snprintf(cmd, sizeof(cmd),
343: "%s -f %s generate %s " SSH_X11_PROTO
344: " untrusted timeout %u 2>" _PATH_DEVNULL,
345: xauth_path, xauthfile, display,
346: x11_timeout_real)) < 0 ||
347: (size_t)r >= sizeof(cmd))
348: fatal("%s: cmd too long", __func__);
349: debug2("%s: %s", __func__, cmd);
350: if (x11_refuse_time == 0) {
351: now = monotime() + 1;
352: if (UINT_MAX - timeout < now)
353: x11_refuse_time = UINT_MAX;
354: else
355: x11_refuse_time = now + timeout;
1.303 djm 356: channel_set_x11_refuse_time(ssh,
357: x11_refuse_time);
1.138 djm 358: }
1.279 djm 359: if (system(cmd) == 0)
360: generated = 1;
1.138 djm 361: }
1.181 markus 362:
363: /*
364: * When in untrusted mode, we read the cookie only if it was
365: * successfully generated as an untrusted one in the step
366: * above.
367: */
368: if (trusted || generated) {
369: snprintf(cmd, sizeof(cmd),
370: "%s %s%s list %s 2>" _PATH_DEVNULL,
371: xauth_path,
372: generated ? "-f " : "" ,
373: generated ? xauthfile : "",
374: display);
375: debug2("x11_get_proto: %s", cmd);
376: f = popen(cmd, "r");
377: if (f && fgets(line, sizeof(line), f) &&
378: sscanf(line, "%*s %511s %511s", proto, data) == 2)
379: got_data = 1;
380: if (f)
381: pclose(f);
1.279 djm 382: }
1.138 djm 383: }
384:
385: if (do_unlink) {
386: unlink(xauthfile);
387: rmdir(xauthdir);
388: }
389:
1.279 djm 390: /* Don't fall back to fake X11 data for untrusted forwarding */
391: if (!trusted && !got_data) {
392: error("Warning: untrusted X11 forwarding setup failed: "
393: "xauth key data not generated");
394: return -1;
395: }
396:
1.138 djm 397: /*
398: * If we didn't get authentication data, just make up some
399: * data. The forwarding code will check the validity of the
400: * response anyway, and substitute this data. The X11
401: * server, however, will ignore this fake data and use
402: * whatever authentication mechanisms it was using otherwise
403: * for the local connection.
404: */
405: if (!got_data) {
1.288 tedu 406: u_int8_t rnd[16];
407: u_int i;
1.138 djm 408:
409: logit("Warning: No xauth data; "
410: "using fake authentication data for X11 forwarding.");
411: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.288 tedu 412: arc4random_buf(rnd, sizeof(rnd));
413: for (i = 0; i < sizeof(rnd); i++) {
1.138 djm 414: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.288 tedu 415: rnd[i]);
1.138 djm 416: }
417: }
1.279 djm 418:
419: return 0;
1.1 deraadt 420: }
421:
1.13 markus 422: /*
423: * Checks if the client window has changed, and sends a packet about it to
424: * the server if so. The actual change is detected elsewhere (by a software
425: * interrupt on Unix); this just checks the flag and sends a message if
426: * appropriate.
427: */
1.1 deraadt 428:
1.77 itojun 429: static void
1.303 djm 430: client_check_window_change(struct ssh *ssh)
1.1 deraadt 431: {
1.292 djm 432: if (!received_window_change_signal)
1.16 markus 433: return;
434: /** XXX race */
435: received_window_change_signal = 0;
436:
1.292 djm 437: debug2("%s: changed", __func__);
1.16 markus 438:
1.303 djm 439: channel_send_window_changes(ssh);
1.1 deraadt 440: }
441:
1.264 markus 442: static int
1.297 markus 443: client_global_request_reply(int type, u_int32_t seq, struct ssh *ssh)
1.117 markus 444: {
1.196 djm 445: struct global_confirm *gc;
446:
447: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 448: return 0;
1.196 djm 449: if (gc->cb != NULL)
1.303 djm 450: gc->cb(ssh, type, seq, gc->ctx);
1.196 djm 451: if (--gc->ref_count <= 0) {
452: TAILQ_REMOVE(&global_confirms, gc, entry);
1.257 tedu 453: explicit_bzero(gc, sizeof(*gc));
1.250 djm 454: free(gc);
1.196 djm 455: }
456:
1.210 andreas 457: packet_set_alive_timeouts(0);
1.264 markus 458: return 0;
1.117 markus 459: }
460:
461: static void
462: server_alive_check(void)
463: {
1.210 andreas 464: if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
1.228 djm 465: logit("Timeout, server %s not responding.", host);
1.176 markus 466: cleanup_exit(255);
467: }
1.117 markus 468: packet_start(SSH2_MSG_GLOBAL_REQUEST);
469: packet_put_cstring("keepalive@openssh.com");
470: packet_put_char(1); /* boolean: want reply */
471: packet_send();
1.196 djm 472: /* Insert an empty placeholder to maintain ordering */
473: client_register_global_confirm(NULL, NULL);
1.117 markus 474: }
475:
1.13 markus 476: /*
477: * Waits until the client can do something (some data becomes available on
478: * one of the file descriptors).
479: */
1.77 itojun 480: static void
1.303 djm 481: client_wait_until_can_do_something(struct ssh *ssh,
482: fd_set **readsetp, fd_set **writesetp,
1.130 avsm 483: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 484: {
1.117 markus 485: struct timeval tv, *tvp;
1.222 djm 486: int timeout_secs;
1.251 dtucker 487: time_t minwait_secs = 0, server_alive_time = 0, now = monotime();
1.117 markus 488: int ret;
489:
1.46 markus 490: /* Add any selections by the channel mechanism. */
1.302 djm 491: channel_prepare_select(active_state, readsetp, writesetp, maxfdp,
492: nallocp, &minwait_secs);
1.11 markus 493:
1.292 djm 494: /* channel_prepare_select could have closed the last channel */
1.303 djm 495: if (session_closed && !channel_still_open(ssh) &&
1.292 djm 496: !packet_have_data_to_write()) {
497: /* clear mask since we did not call select() */
498: memset(*readsetp, 0, *nallocp);
499: memset(*writesetp, 0, *nallocp);
500: return;
1.16 markus 501: }
1.11 markus 502:
1.294 djm 503: FD_SET(connection_in, *readsetp);
504:
1.11 markus 505: /* Select server connection if have data to write to the server. */
506: if (packet_have_data_to_write())
1.46 markus 507: FD_SET(connection_out, *writesetp);
1.11 markus 508:
1.13 markus 509: /*
510: * Wait for something to happen. This will suspend the process until
511: * some selected descriptor can be read, written, or has some other
1.222 djm 512: * event pending, or a timeout expires.
1.13 markus 513: */
1.11 markus 514:
1.222 djm 515: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.292 djm 516: if (options.server_alive_interval > 0) {
1.222 djm 517: timeout_secs = options.server_alive_interval;
1.249 dtucker 518: server_alive_time = now + options.server_alive_interval;
519: }
1.292 djm 520: if (options.rekey_interval > 0 && !rekeying)
1.287 deraadt 521: timeout_secs = MINIMUM(timeout_secs, packet_get_rekey_timeout());
1.303 djm 522: set_control_persist_exit_time(ssh);
1.222 djm 523: if (control_persist_exit_time > 0) {
1.287 deraadt 524: timeout_secs = MINIMUM(timeout_secs,
1.249 dtucker 525: control_persist_exit_time - now);
1.222 djm 526: if (timeout_secs < 0)
527: timeout_secs = 0;
528: }
1.239 djm 529: if (minwait_secs != 0)
1.287 deraadt 530: timeout_secs = MINIMUM(timeout_secs, (int)minwait_secs);
1.222 djm 531: if (timeout_secs == INT_MAX)
1.117 markus 532: tvp = NULL;
1.129 deraadt 533: else {
1.222 djm 534: tv.tv_sec = timeout_secs;
1.117 markus 535: tv.tv_usec = 0;
536: tvp = &tv;
537: }
1.222 djm 538:
1.117 markus 539: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
540: if (ret < 0) {
1.11 markus 541: char buf[100];
1.51 markus 542:
543: /*
544: * We have to clear the select masks, because we return.
545: * We have to return, because the mainloop checks for the flags
546: * set by the signal handlers.
547: */
1.87 markus 548: memset(*readsetp, 0, *nallocp);
549: memset(*writesetp, 0, *nallocp);
1.50 deraadt 550:
1.11 markus 551: if (errno == EINTR)
552: return;
553: /* Note: we might still have data in the buffers. */
554: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
555: buffer_append(&stderr_buffer, buf, strlen(buf));
556: quit_pending = 1;
1.249 dtucker 557: } else if (ret == 0) {
558: /*
559: * Timeout. Could have been either keepalive or rekeying.
560: * Keepalive we check here, rekeying is checked in clientloop.
561: */
1.251 dtucker 562: if (server_alive_time != 0 && server_alive_time <= monotime())
1.249 dtucker 563: server_alive_check();
564: }
565:
1.11 markus 566: }
567:
1.77 itojun 568: static void
1.31 markus 569: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 570: {
1.11 markus 571: /* Flush stdout and stderr buffers. */
1.31 markus 572: if (buffer_len(bout) > 0)
1.197 djm 573: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
574: buffer_len(bout));
1.31 markus 575: if (buffer_len(berr) > 0)
1.197 djm 576: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
577: buffer_len(berr));
1.11 markus 578:
1.233 djm 579: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 580:
1.305 djm 581: sshbuf_reset(bin);
582: sshbuf_reset(bout);
583: sshbuf_reset(berr);
1.11 markus 584:
585: /* Send the suspend signal to the program itself. */
586: kill(getpid(), SIGTSTP);
587:
1.132 djm 588: /* Reset window sizes in case they have changed */
589: received_window_change_signal = 1;
1.11 markus 590:
1.233 djm 591: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 592: }
593:
1.77 itojun 594: static void
1.161 deraadt 595: client_process_net_input(fd_set *readset)
1.11 markus 596: {
1.280 markus 597: int len;
1.17 markus 598: char buf[8192];
1.11 markus 599:
1.13 markus 600: /*
601: * Read input from the server, and add any such data to the buffer of
602: * the packet subsystem.
603: */
1.11 markus 604: if (FD_ISSET(connection_in, readset)) {
605: /* Read as much as possible. */
1.280 markus 606: len = read(connection_in, buf, sizeof(buf));
607: if (len == 0) {
1.197 djm 608: /*
609: * Received EOF. The remote host has closed the
610: * connection.
611: */
612: snprintf(buf, sizeof buf,
613: "Connection to %.300s closed by remote host.\r\n",
614: host);
1.1 deraadt 615: buffer_append(&stderr_buffer, buf, strlen(buf));
616: quit_pending = 1;
617: return;
1.11 markus 618: }
1.13 markus 619: /*
620: * There is a kernel bug on Solaris that causes select to
621: * sometimes wake up even though there is no data available.
622: */
1.53 millert 623: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 624: len = 0;
625:
626: if (len < 0) {
1.197 djm 627: /*
628: * An error has encountered. Perhaps there is a
629: * network problem.
630: */
631: snprintf(buf, sizeof buf,
632: "Read from remote host %.300s: %.100s\r\n",
633: host, strerror(errno));
1.11 markus 634: buffer_append(&stderr_buffer, buf, strlen(buf));
635: quit_pending = 1;
636: return;
637: }
638: packet_process_incoming(buf, len);
639: }
1.17 markus 640: }
1.16 markus 641:
1.97 jakob 642: static void
1.303 djm 643: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 644: {
1.190 djm 645: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
646: char errmsg[256];
647: int tochan;
648:
1.234 djm 649: /*
650: * If a TTY was explicitly requested, then a failure to allocate
651: * one is fatal.
652: */
653: if (cr->action == CONFIRM_TTY &&
654: (options.request_tty == REQUEST_TTY_FORCE ||
655: options.request_tty == REQUEST_TTY_YES))
656: cr->action = CONFIRM_CLOSE;
657:
1.312 djm 658: /* XXX suppress on mux _client_ quietmode */
1.190 djm 659: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 660: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 661:
662: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
663: debug2("%s request accepted on channel %d",
664: cr->request_type, c->self);
665: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
666: if (tochan) {
667: snprintf(errmsg, sizeof(errmsg),
668: "%s request failed\r\n", cr->request_type);
669: } else {
670: snprintf(errmsg, sizeof(errmsg),
671: "%s request failed on channel %d",
672: cr->request_type, c->self);
673: }
674: /* If error occurred on primary session channel, then exit */
1.234 djm 675: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 676: fatal("%s", errmsg);
1.234 djm 677: /*
678: * If error occurred on mux client, append to
679: * their stderr.
680: */
681: if (tochan) {
1.303 djm 682: buffer_append(c->extended, errmsg, strlen(errmsg));
1.234 djm 683: } else
1.190 djm 684: error("%s", errmsg);
1.234 djm 685: if (cr->action == CONFIRM_TTY) {
686: /*
687: * If a TTY allocation error occurred, then arrange
688: * for the correct TTY to leave raw mode.
689: */
690: if (c->self == session_ident)
691: leave_raw_mode(0);
692: else
1.303 djm 693: mux_tty_alloc_failed(ssh, c);
1.234 djm 694: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 695: chan_read_failed(ssh, c);
696: chan_write_failed(ssh, c);
1.190 djm 697: }
698: }
1.250 djm 699: free(cr);
1.190 djm 700: }
701:
702: static void
1.303 djm 703: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 704: {
1.250 djm 705: free(ctx);
1.190 djm 706: }
1.129 deraadt 707:
1.236 djm 708: void
1.303 djm 709: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 710: enum confirm_action action)
1.190 djm 711: {
1.255 djm 712: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 713:
1.190 djm 714: cr->request_type = request;
1.234 djm 715: cr->action = action;
1.123 djm 716:
1.303 djm 717: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 718: client_abandon_status_confirm, cr);
1.196 djm 719: }
720:
721: void
722: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
723: {
1.201 djm 724: struct global_confirm *gc, *last_gc;
1.196 djm 725:
726: /* Coalesce identical callbacks */
1.201 djm 727: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
728: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
729: if (++last_gc->ref_count >= INT_MAX)
730: fatal("%s: last_gc->ref_count = %d",
731: __func__, last_gc->ref_count);
1.196 djm 732: return;
733: }
734:
1.255 djm 735: gc = xcalloc(1, sizeof(*gc));
1.196 djm 736: gc->cb = cb;
737: gc->ctx = ctx;
738: gc->ref_count = 1;
739: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 740: }
741:
742: static void
1.303 djm 743: process_cmdline(struct ssh *ssh)
1.97 jakob 744: {
745: void (*handler)(int);
1.261 millert 746: char *s, *cmd;
747: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
748: struct Forward fwd;
1.97 jakob 749:
1.257 tedu 750: memset(&fwd, 0, sizeof(fwd));
1.183 djm 751:
1.233 djm 752: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 753: handler = signal(SIGINT, SIG_IGN);
1.99 markus 754: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 755: if (s == NULL)
756: goto out;
1.256 deraadt 757: while (isspace((u_char)*s))
1.97 jakob 758: s++;
1.121 djm 759: if (*s == '-')
760: s++; /* Skip cmdline '-', if any */
1.120 dtucker 761: if (*s == '\0')
1.97 jakob 762: goto out;
1.121 djm 763:
1.122 djm 764: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 765: logit("Commands:");
1.164 djm 766: logit(" -L[bind_address:]port:host:hostport "
767: "Request local forward");
768: logit(" -R[bind_address:]port:host:hostport "
769: "Request remote forward");
1.204 stevesk 770: logit(" -D[bind_address:]port "
771: "Request dynamic forward");
1.237 markus 772: logit(" -KL[bind_address:]port "
773: "Cancel local forward");
1.165 stevesk 774: logit(" -KR[bind_address:]port "
1.164 djm 775: "Cancel remote forward");
1.237 markus 776: logit(" -KD[bind_address:]port "
777: "Cancel dynamic forward");
1.146 reyk 778: if (!options.permit_local_command)
779: goto out;
1.164 djm 780: logit(" !args "
781: "Execute local command");
1.146 reyk 782: goto out;
783: }
784:
785: if (*s == '!' && options.permit_local_command) {
786: s++;
787: ssh_local_cmd(s);
1.121 djm 788: goto out;
789: }
790:
791: if (*s == 'K') {
792: delete = 1;
793: s++;
794: }
1.204 stevesk 795: if (*s == 'L')
796: local = 1;
797: else if (*s == 'R')
798: remote = 1;
799: else if (*s == 'D')
800: dynamic = 1;
801: else {
1.109 itojun 802: logit("Invalid command.");
1.97 jakob 803: goto out;
804: }
1.204 stevesk 805:
1.256 deraadt 806: while (isspace((u_char)*++s))
1.179 tedu 807: ;
1.97 jakob 808:
1.217 djm 809: /* XXX update list of forwards in options */
1.121 djm 810: if (delete) {
1.261 millert 811: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
812: if (!parse_forward(&fwd, s, 1, 0)) {
813: logit("Bad forwarding close specification.");
1.121 djm 814: goto out;
815: }
1.237 markus 816: if (remote)
1.303 djm 817: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 818: else if (dynamic)
1.303 djm 819: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 820: 0, &options.fwd_opts) > 0;
1.237 markus 821: else
1.303 djm 822: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 823: CHANNEL_CANCEL_PORT_STATIC,
824: &options.fwd_opts) > 0;
1.237 markus 825: if (!ok) {
1.290 dtucker 826: logit("Unknown port forwarding.");
1.237 markus 827: goto out;
828: }
829: logit("Canceled forwarding.");
1.121 djm 830: } else {
1.209 djm 831: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 832: logit("Bad forwarding specification.");
833: goto out;
834: }
1.204 stevesk 835: if (local || dynamic) {
1.303 djm 836: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 837: &options.fwd_opts)) {
1.121 djm 838: logit("Port forwarding failed.");
839: goto out;
840: }
1.135 djm 841: } else {
1.303 djm 842: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 843: logit("Port forwarding failed.");
844: goto out;
845: }
1.135 djm 846: }
1.121 djm 847: logit("Forwarding port.");
848: }
849:
1.97 jakob 850: out:
851: signal(SIGINT, handler);
1.233 djm 852: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 853: free(cmd);
854: free(fwd.listen_host);
1.261 millert 855: free(fwd.listen_path);
1.250 djm 856: free(fwd.connect_host);
1.261 millert 857: free(fwd.connect_path);
1.97 jakob 858: }
859:
1.244 dtucker 860: /* reasons to suppress output of an escape command in help output */
861: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 862: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
863: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
864: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.244 dtucker 865: struct escape_help_text {
866: const char *cmd;
867: const char *text;
868: unsigned int flags;
869: };
870: static struct escape_help_text esc_txt[] = {
871: {".", "terminate session", SUPPRESS_MUXMASTER},
872: {".", "terminate connection (and any multiplexed sessions)",
873: SUPPRESS_MUXCLIENT},
1.292 djm 874: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.244 dtucker 875: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1.292 djm 876: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 877: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 878: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
879: {"#", "list forwarded connections", SUPPRESS_NEVER},
880: {"&", "background ssh (when waiting for connections to terminate)",
881: SUPPRESS_MUXCLIENT},
882: {"?", "this message", SUPPRESS_NEVER},
883: };
884:
885: static void
1.292 djm 886: print_escape_help(Buffer *b, int escape_char, int mux_client, int using_stderr)
1.244 dtucker 887: {
888: unsigned int i, suppress_flags;
889: char string[1024];
890:
891: snprintf(string, sizeof string, "%c?\r\n"
892: "Supported escape sequences:\r\n", escape_char);
893: buffer_append(b, string, strlen(string));
894:
1.292 djm 895: suppress_flags =
1.244 dtucker 896: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
897: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
898: (using_stderr ? 0 : SUPPRESS_SYSLOG);
899:
900: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
901: if (esc_txt[i].flags & suppress_flags)
902: continue;
1.246 dtucker 903: snprintf(string, sizeof string, " %c%-3s - %s\r\n",
1.244 dtucker 904: escape_char, esc_txt[i].cmd, esc_txt[i].text);
905: buffer_append(b, string, strlen(string));
906: }
907:
908: snprintf(string, sizeof string,
1.246 dtucker 909: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 910: "(Note that escapes are only recognized immediately after "
911: "newline.)\r\n", escape_char, escape_char);
912: buffer_append(b, string, strlen(string));
913: }
914:
1.195 djm 915: /*
1.296 naddy 916: * Process the characters one by one.
1.195 djm 917: */
1.77 itojun 918: static int
1.303 djm 919: process_escapes(struct ssh *ssh, Channel *c,
920: Buffer *bin, Buffer *bout, Buffer *berr,
1.195 djm 921: char *buf, int len)
1.31 markus 922: {
1.32 markus 923: char string[1024];
1.31 markus 924: pid_t pid;
925: int bytes = 0;
1.42 markus 926: u_int i;
927: u_char ch;
1.31 markus 928: char *s;
1.294 djm 929: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
930: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 931:
1.294 djm 932: if (c->filter_ctx == NULL)
933: return 0;
1.195 djm 934:
1.139 djm 935: if (len <= 0)
936: return (0);
937:
938: for (i = 0; i < (u_int)len; i++) {
1.31 markus 939: /* Get one character at a time. */
940: ch = buf[i];
941:
1.294 djm 942: if (efc->escape_pending) {
1.31 markus 943: /* We have previously seen an escape character. */
944: /* Clear the flag now. */
1.294 djm 945: efc->escape_pending = 0;
1.31 markus 946:
947: /* Process the escaped character. */
948: switch (ch) {
949: case '.':
950: /* Terminate the connection. */
1.195 djm 951: snprintf(string, sizeof string, "%c.\r\n",
1.294 djm 952: efc->escape_char);
1.32 markus 953: buffer_append(berr, string, strlen(string));
1.31 markus 954:
1.217 djm 955: if (c && c->ctl_chan != -1) {
1.303 djm 956: chan_read_failed(ssh, c);
957: chan_write_failed(ssh, c);
958: if (c->detach_user) {
959: c->detach_user(ssh,
960: c->self, NULL);
961: }
1.253 dtucker 962: c->type = SSH_CHANNEL_ABANDONED;
1.303 djm 963: buffer_clear(c->input);
964: chan_ibuf_empty(ssh, c);
1.195 djm 965: return 0;
966: } else
967: quit_pending = 1;
1.31 markus 968: return -1;
969:
970: case 'Z' - 64:
1.195 djm 971: /* XXX support this for mux clients */
1.217 djm 972: if (c && c->ctl_chan != -1) {
1.245 dtucker 973: char b[16];
1.195 djm 974: noescape:
1.245 dtucker 975: if (ch == 'Z' - 64)
976: snprintf(b, sizeof b, "^Z");
977: else
978: snprintf(b, sizeof b, "%c", ch);
1.195 djm 979: snprintf(string, sizeof string,
1.245 dtucker 980: "%c%s escape not available to "
1.195 djm 981: "multiplexed sessions\r\n",
1.294 djm 982: efc->escape_char, b);
1.195 djm 983: buffer_append(berr, string,
984: strlen(string));
985: continue;
986: }
1.197 djm 987: /* Suspend the program. Inform the user */
1.195 djm 988: snprintf(string, sizeof string,
1.294 djm 989: "%c^Z [suspend ssh]\r\n", efc->escape_char);
1.32 markus 990: buffer_append(berr, string, strlen(string));
1.31 markus 991:
992: /* Restore terminal modes and suspend. */
993: client_suspend_self(bin, bout, berr);
994:
995: /* We have been continued. */
996: continue;
997:
1.111 markus 998: case 'B':
1.292 djm 999: snprintf(string, sizeof string,
1.294 djm 1000: "%cB\r\n", efc->escape_char);
1.292 djm 1001: buffer_append(berr, string, strlen(string));
1.303 djm 1002: channel_request_start(ssh, c->self, "break", 0);
1.292 djm 1003: packet_put_int(1000);
1004: packet_send();
1.111 markus 1005: continue;
1006:
1.54 markus 1007: case 'R':
1.292 djm 1008: if (datafellows & SSH_BUG_NOREKEY)
1009: logit("Server does not "
1010: "support re-keying");
1011: else
1012: need_rekeying = 1;
1.54 markus 1013: continue;
1014:
1.242 dtucker 1015: case 'V':
1016: /* FALLTHROUGH */
1017: case 'v':
1018: if (c && c->ctl_chan != -1)
1019: goto noescape;
1020: if (!log_is_on_stderr()) {
1021: snprintf(string, sizeof string,
1022: "%c%c [Logging to syslog]\r\n",
1.294 djm 1023: efc->escape_char, ch);
1.242 dtucker 1024: buffer_append(berr, string,
1025: strlen(string));
1026: continue;
1027: }
1028: if (ch == 'V' && options.log_level >
1029: SYSLOG_LEVEL_QUIET)
1030: log_change_level(--options.log_level);
1031: if (ch == 'v' && options.log_level <
1032: SYSLOG_LEVEL_DEBUG3)
1033: log_change_level(++options.log_level);
1034: snprintf(string, sizeof string,
1.294 djm 1035: "%c%c [LogLevel %s]\r\n",
1036: efc->escape_char, ch,
1.242 dtucker 1037: log_level_name(options.log_level));
1038: buffer_append(berr, string, strlen(string));
1039: continue;
1040:
1.31 markus 1041: case '&':
1.217 djm 1042: if (c && c->ctl_chan != -1)
1.195 djm 1043: goto noescape;
1.31 markus 1044: /*
1.197 djm 1045: * Detach the program (continue to serve
1046: * connections, but put in background and no
1047: * more new connections).
1.31 markus 1048: */
1049: /* Restore tty modes. */
1.233 djm 1050: leave_raw_mode(
1051: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1052:
1053: /* Stop listening for new connections. */
1.303 djm 1054: channel_stop_listening(ssh);
1.31 markus 1055:
1.86 markus 1056: snprintf(string, sizeof string,
1.294 djm 1057: "%c& [backgrounded]\n", efc->escape_char);
1.86 markus 1058: buffer_append(berr, string, strlen(string));
1.31 markus 1059:
1060: /* Fork into background. */
1061: pid = fork();
1062: if (pid < 0) {
1063: error("fork: %.100s", strerror(errno));
1064: continue;
1065: }
1066: if (pid != 0) { /* This is the parent. */
1067: /* The parent just exits. */
1068: exit(0);
1069: }
1070: /* The child continues serving connections. */
1.292 djm 1071: buffer_append(bin, "\004", 1);
1072: /* fake EOF on stdin */
1073: return -1;
1.31 markus 1074: case '?':
1.294 djm 1075: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1076: (c && c->ctl_chan != -1),
1077: log_is_on_stderr());
1.31 markus 1078: continue;
1079:
1080: case '#':
1.195 djm 1081: snprintf(string, sizeof string, "%c#\r\n",
1.294 djm 1082: efc->escape_char);
1.32 markus 1083: buffer_append(berr, string, strlen(string));
1.303 djm 1084: s = channel_open_message(ssh);
1.31 markus 1085: buffer_append(berr, s, strlen(s));
1.250 djm 1086: free(s);
1.97 jakob 1087: continue;
1088:
1089: case 'C':
1.217 djm 1090: if (c && c->ctl_chan != -1)
1.206 djm 1091: goto noescape;
1.303 djm 1092: process_cmdline(ssh);
1.31 markus 1093: continue;
1094:
1095: default:
1.294 djm 1096: if (ch != efc->escape_char) {
1097: buffer_put_char(bin, efc->escape_char);
1.31 markus 1098: bytes++;
1099: }
1100: /* Escaped characters fall through here */
1101: break;
1102: }
1103: } else {
1104: /*
1.197 djm 1105: * The previous character was not an escape char.
1106: * Check if this is an escape.
1.31 markus 1107: */
1.294 djm 1108: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1109: /*
1110: * It is. Set the flag and continue to
1111: * next character.
1112: */
1.294 djm 1113: efc->escape_pending = 1;
1.31 markus 1114: continue;
1115: }
1116: }
1117:
1118: /*
1119: * Normal character. Record whether it was a newline,
1120: * and append it to the buffer.
1121: */
1122: last_was_cr = (ch == '\r' || ch == '\n');
1123: buffer_put_char(bin, ch);
1124: bytes++;
1125: }
1126: return bytes;
1127: }
1128:
1.13 markus 1129: /*
1.15 markus 1130: * Get packets from the connection input buffer, and process them as long as
1131: * there are packets available.
1132: *
1133: * Any unknown packets received during the actual
1134: * session cause the session to terminate. This is
1135: * intended to make debugging easier since no
1136: * confirmations are sent. Any compatible protocol
1137: * extensions must be negotiated during the
1138: * preparatory phase.
1139: */
1140:
1.77 itojun 1141: static void
1.49 itojun 1142: client_process_buffered_input_packets(void)
1.15 markus 1143: {
1.298 markus 1144: ssh_dispatch_run_fatal(active_state, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1145: }
1146:
1.31 markus 1147: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1148:
1.195 djm 1149: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1150: void *
1151: client_new_escape_filter_ctx(int escape_char)
1152: {
1153: struct escape_filter_ctx *ret;
1154:
1.255 djm 1155: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1156: ret->escape_pending = 0;
1157: ret->escape_char = escape_char;
1158: return (void *)ret;
1159: }
1160:
1.198 djm 1161: /* Free the escape filter context on channel free */
1162: void
1.303 djm 1163: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1164: {
1.250 djm 1165: free(ctx);
1.198 djm 1166: }
1167:
1.195 djm 1168: int
1.303 djm 1169: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1170: {
1.190 djm 1171: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1172: return 0;
1173:
1.303 djm 1174: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1175: buf, len);
1.30 markus 1176: }
1177:
1.77 itojun 1178: static void
1.303 djm 1179: client_channel_closed(struct ssh *ssh, int id, void *arg)
1.60 markus 1180: {
1.303 djm 1181: channel_cancel_cleanup(ssh, id);
1.60 markus 1182: session_closed = 1;
1.233 djm 1183: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1184: }
1185:
1.15 markus 1186: /*
1.13 markus 1187: * Implements the interactive session with the server. This is called after
1188: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1189: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1190: * used as an escape character for terminating or suspending the session.
1.13 markus 1191: */
1.20 markus 1192: int
1.303 djm 1193: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1194: int ssh2_chan_id)
1.1 deraadt 1195: {
1.46 markus 1196: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1197: double start_time, total_time;
1.284 djm 1198: int r, max_fd = 0, max_fd2 = 0, len;
1.200 markus 1199: u_int64_t ibytes, obytes;
1.130 avsm 1200: u_int nalloc = 0;
1.11 markus 1201: char buf[100];
1202:
1203: debug("Entering interactive session.");
1.277 semarie 1204:
1.278 semarie 1205: if (options.control_master &&
1.286 djm 1206: !option_clear_or_none(options.control_path)) {
1.278 semarie 1207: debug("pledge: id");
1.285 tb 1208: if (pledge("stdio rpath wpath cpath unix inet dns recvfd proc exec id tty",
1.278 semarie 1209: NULL) == -1)
1210: fatal("%s pledge(): %s", __func__, strerror(errno));
1211:
1212: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1213: debug("pledge: exec");
1214: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1215: NULL) == -1)
1216: fatal("%s pledge(): %s", __func__, strerror(errno));
1217:
1218: } else if (options.update_hostkeys) {
1219: debug("pledge: filesystem full");
1220: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1221: NULL) == -1)
1222: fatal("%s pledge(): %s", __func__, strerror(errno));
1223:
1.286 djm 1224: } else if (!option_clear_or_none(options.proxy_command) ||
1225: fork_after_authentication_flag) {
1.277 semarie 1226: debug("pledge: proc");
1227: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1228: fatal("%s pledge(): %s", __func__, strerror(errno));
1229:
1230: } else {
1231: debug("pledge: network");
1.300 mestre 1232: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.277 semarie 1233: fatal("%s pledge(): %s", __func__, strerror(errno));
1234: }
1.11 markus 1235:
1.307 dtucker 1236: start_time = monotime_double();
1.11 markus 1237:
1238: /* Initialize variables. */
1239: last_was_cr = 1;
1240: exit_status = -1;
1241: connection_in = packet_get_connection_in();
1242: connection_out = packet_get_connection_out();
1.287 deraadt 1243: max_fd = MAXIMUM(connection_in, connection_out);
1.46 markus 1244:
1.11 markus 1245: quit_pending = 0;
1246:
1247: /* Initialize buffers. */
1248: buffer_init(&stderr_buffer);
1249:
1.15 markus 1250: client_init_dispatch();
1251:
1.105 markus 1252: /*
1253: * Set signal handlers, (e.g. to restore non-blocking mode)
1254: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1255: */
1.131 djm 1256: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1257: signal(SIGHUP, signal_handler);
1.105 markus 1258: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1259: signal(SIGINT, signal_handler);
1260: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1261: signal(SIGQUIT, signal_handler);
1262: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1263: signal(SIGTERM, signal_handler);
1.132 djm 1264: signal(SIGWINCH, window_change_handler);
1.11 markus 1265:
1266: if (have_pty)
1.233 djm 1267: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1268:
1.292 djm 1269: session_ident = ssh2_chan_id;
1270: if (session_ident != -1) {
1271: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1272: channel_register_filter(ssh, session_ident,
1.292 djm 1273: client_simple_escape_filter, NULL,
1274: client_filter_cleanup,
1275: client_new_escape_filter_ctx(
1276: escape_char_arg));
1.232 djm 1277: }
1.303 djm 1278: channel_register_cleanup(ssh, session_ident,
1.292 djm 1279: client_channel_closed, 0);
1.48 markus 1280: }
1.30 markus 1281:
1.11 markus 1282: /* Main loop of the client for the interactive session mode. */
1283: while (!quit_pending) {
1284:
1.13 markus 1285: /* Process buffered packets sent by the server. */
1.11 markus 1286: client_process_buffered_input_packets();
1287:
1.303 djm 1288: if (session_closed && !channel_still_open(ssh))
1.60 markus 1289: break;
1290:
1.303 djm 1291: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1292: debug("rekeying in progress");
1.284 djm 1293: } else if (need_rekeying) {
1294: /* manual rekey request */
1295: debug("need rekeying");
1.303 djm 1296: if ((r = kex_start_rekex(ssh)) != 0)
1.284 djm 1297: fatal("%s: kex_start_rekex: %s", __func__,
1298: ssh_err(r));
1299: need_rekeying = 0;
1.56 markus 1300: } else {
1301: /*
1302: * Make packets from buffered channel data, and
1303: * enqueue them for sending to the server.
1304: */
1305: if (packet_not_very_much_data_to_write())
1.303 djm 1306: channel_output_poll(ssh);
1.11 markus 1307:
1.56 markus 1308: /*
1309: * Check if the window size has changed, and buffer a
1310: * message about it to the server if so.
1311: */
1.303 djm 1312: client_check_window_change(ssh);
1.11 markus 1313:
1.56 markus 1314: if (quit_pending)
1315: break;
1316: }
1.13 markus 1317: /*
1318: * Wait until we have something to do (something becomes
1319: * available on one of the descriptors).
1320: */
1.81 markus 1321: max_fd2 = max_fd;
1.303 djm 1322: client_wait_until_can_do_something(ssh, &readset, &writeset,
1323: &max_fd2, &nalloc, ssh_packet_is_rekeying(ssh));
1.11 markus 1324:
1325: if (quit_pending)
1326: break;
1327:
1.56 markus 1328: /* Do channel operations unless rekeying in progress. */
1.303 djm 1329: if (!ssh_packet_is_rekeying(ssh))
1330: channel_after_select(ssh, readset, writeset);
1.11 markus 1331:
1.17 markus 1332: /* Buffer input from the connection. */
1.46 markus 1333: client_process_net_input(readset);
1.17 markus 1334:
1335: if (quit_pending)
1336: break;
1.11 markus 1337:
1.197 djm 1338: /*
1339: * Send as much buffered packet data as possible to the
1340: * sender.
1341: */
1.46 markus 1342: if (FD_ISSET(connection_out, writeset))
1.11 markus 1343: packet_write_poll();
1.222 djm 1344:
1345: /*
1346: * If we are a backgrounded control master, and the
1347: * timeout has expired without any active client
1348: * connections, then quit.
1349: */
1350: if (control_persist_exit_time > 0) {
1.251 dtucker 1351: if (monotime() >= control_persist_exit_time) {
1.222 djm 1352: debug("ControlPersist timeout expired");
1353: break;
1354: }
1355: }
1.11 markus 1356: }
1.250 djm 1357: free(readset);
1358: free(writeset);
1.11 markus 1359:
1360: /* Terminate the session. */
1361:
1362: /* Stop watching for window change. */
1.132 djm 1363: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1364:
1.292 djm 1365: packet_start(SSH2_MSG_DISCONNECT);
1366: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1367: packet_put_cstring("disconnected by user");
1368: packet_put_cstring(""); /* language tag */
1369: packet_send();
1370: packet_write_wait();
1.11 markus 1371:
1.303 djm 1372: channel_free_all(ssh);
1.11 markus 1373:
1.75 markus 1374: if (have_pty)
1.233 djm 1375: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1376:
1377: /* restore blocking io */
1378: if (!isatty(fileno(stdin)))
1379: unset_nonblock(fileno(stdin));
1380: if (!isatty(fileno(stdout)))
1381: unset_nonblock(fileno(stdout));
1382: if (!isatty(fileno(stderr)))
1383: unset_nonblock(fileno(stderr));
1.116 dtucker 1384:
1385: /*
1386: * If there was no shell or command requested, there will be no remote
1387: * exit status to be returned. In that case, clear error code if the
1388: * connection was deliberately terminated at this end.
1389: */
1390: if (no_shell_flag && received_signal == SIGTERM) {
1391: received_signal = 0;
1392: exit_status = 0;
1393: }
1.75 markus 1394:
1.301 dtucker 1395: if (received_signal) {
1396: verbose("Killed by signal %d.", (int) received_signal);
1397: cleanup_exit(0);
1398: }
1.75 markus 1399:
1.13 markus 1400: /*
1401: * In interactive mode (with pseudo tty) display a message indicating
1402: * that the connection has been closed.
1403: */
1.11 markus 1404: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1405: snprintf(buf, sizeof buf,
1406: "Connection to %.64s closed.\r\n", host);
1.11 markus 1407: buffer_append(&stderr_buffer, buf, strlen(buf));
1408: }
1.70 markus 1409:
1.11 markus 1410: /* Output any buffered data for stderr. */
1.231 djm 1411: if (buffer_len(&stderr_buffer) > 0) {
1.230 djm 1412: len = atomicio(vwrite, fileno(stderr),
1413: buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1.231 djm 1414: if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1.11 markus 1415: error("Write failed flushing stderr buffer.");
1.231 djm 1416: else
1417: buffer_consume(&stderr_buffer, len);
1.11 markus 1418: }
1419:
1420: /* Clear and free any buffers. */
1.281 jsg 1421: explicit_bzero(buf, sizeof(buf));
1.11 markus 1422: buffer_free(&stderr_buffer);
1423:
1424: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1425: total_time = monotime_double() - start_time;
1.263 markus 1426: packet_get_bytes(&ibytes, &obytes);
1.200 markus 1427: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1428: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1429: if (total_time > 0)
1.200 markus 1430: verbose("Bytes per second: sent %.1f, received %.1f",
1431: obytes / total_time, ibytes / total_time);
1.11 markus 1432: /* Return the exit status of the program. */
1433: debug("Exit status %d", exit_status);
1434: return exit_status;
1.15 markus 1435: }
1436:
1437: /*********/
1438:
1.77 itojun 1439: static Channel *
1.303 djm 1440: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1441: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1442: {
1.103 deraadt 1443: Channel *c = NULL;
1.289 markus 1444: struct sshbuf *b = NULL;
1.40 markus 1445: char *listen_address, *originator_address;
1.208 djm 1446: u_short listen_port, originator_port;
1.289 markus 1447: int r;
1.40 markus 1448:
1449: /* Get rest of the packet */
1450: listen_address = packet_get_string(NULL);
1451: listen_port = packet_get_int();
1452: originator_address = packet_get_string(NULL);
1453: originator_port = packet_get_int();
1.93 markus 1454: packet_check_eom();
1.40 markus 1455:
1.261 millert 1456: debug("%s: listen %s port %d, originator %s port %d", __func__,
1457: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1458:
1.303 djm 1459: c = channel_connect_by_listen_address(ssh, listen_address, listen_port,
1.191 djm 1460: "forwarded-tcpip", originator_address);
1.40 markus 1461:
1.289 markus 1462: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1463: if ((b = sshbuf_new()) == NULL) {
1464: error("%s: alloc reply", __func__);
1465: goto out;
1466: }
1467: /* reconstruct and send to muxclient */
1468: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1469: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1470: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1471: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1472: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1473: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1474: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1475: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1476: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1477: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1478: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.289 markus 1479: error("%s: compose for muxclient %s", __func__,
1480: ssh_err(r));
1481: goto out;
1482: }
1483: }
1484:
1485: out:
1486: sshbuf_free(b);
1.250 djm 1487: free(originator_address);
1488: free(listen_address);
1.40 markus 1489: return c;
1490: }
1491:
1.103 deraadt 1492: static Channel *
1.303 djm 1493: client_request_forwarded_streamlocal(struct ssh *ssh,
1494: const char *request_type, int rchan)
1.261 millert 1495: {
1496: Channel *c = NULL;
1497: char *listen_path;
1498:
1499: /* Get the remote path. */
1500: listen_path = packet_get_string(NULL);
1501: /* XXX: Skip reserved field for now. */
1502: if (packet_get_string_ptr(NULL) == NULL)
1503: fatal("%s: packet_get_string_ptr failed", __func__);
1504: packet_check_eom();
1505:
1506: debug("%s: %s", __func__, listen_path);
1507:
1.303 djm 1508: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1509: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1510: free(listen_path);
1511: return c;
1512: }
1513:
1514: static Channel *
1.303 djm 1515: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1516: {
1517: Channel *c = NULL;
1518: char *originator;
1.208 djm 1519: u_short originator_port;
1.67 markus 1520: int sock;
1.40 markus 1521:
1522: if (!options.forward_x11) {
1523: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1524: error("Warning: this is probably a break-in attempt by a "
1525: "malicious server.");
1.221 djm 1526: return NULL;
1527: }
1.274 djm 1528: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1529: verbose("Rejected X11 connection after ForwardX11Timeout "
1530: "expired");
1.40 markus 1531: return NULL;
1532: }
1533: originator = packet_get_string(NULL);
1.310 djm 1534: originator_port = packet_get_int();
1.93 markus 1535: packet_check_eom();
1.40 markus 1536: /* XXX check permission */
1.47 markus 1537: debug("client_request_x11: request from %s %d", originator,
1538: originator_port);
1.250 djm 1539: free(originator);
1.303 djm 1540: sock = x11_connect_display(ssh);
1.67 markus 1541: if (sock < 0)
1542: return NULL;
1.303 djm 1543: c = channel_new(ssh, "x11",
1.67 markus 1544: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1545: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1546: c->force_drain = 1;
1.40 markus 1547: return c;
1548: }
1549:
1.103 deraadt 1550: static Channel *
1.303 djm 1551: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1552: {
1553: Channel *c = NULL;
1.262 djm 1554: int r, sock;
1.40 markus 1555:
1556: if (!options.forward_agent) {
1557: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1558: error("Warning: this is probably a break-in attempt by a "
1559: "malicious server.");
1.40 markus 1560: return NULL;
1561: }
1.262 djm 1562: if ((r = ssh_get_authentication_socket(&sock)) != 0) {
1563: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1564: debug("%s: ssh_get_authentication_socket: %s",
1565: __func__, ssh_err(r));
1.67 markus 1566: return NULL;
1.262 djm 1567: }
1.303 djm 1568: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1569: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1570: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1571: "authentication agent connection", 1);
1.82 markus 1572: c->force_drain = 1;
1.40 markus 1573: return c;
1.180 djm 1574: }
1575:
1.306 djm 1576: char *
1.303 djm 1577: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1578: int local_tun, int remote_tun)
1.180 djm 1579: {
1580: Channel *c;
1581: int fd;
1.306 djm 1582: char *ifname = NULL;
1.180 djm 1583:
1584: if (tun_mode == SSH_TUNMODE_NO)
1585: return 0;
1586:
1587: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1588:
1589: /* Open local tunnel device */
1.306 djm 1590: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1591: error("Tunnel device open failed.");
1.306 djm 1592: return NULL;
1.180 djm 1593: }
1.306 djm 1594: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1595:
1.303 djm 1596: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1597: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1598: c->datagram = 1;
1599:
1600: packet_start(SSH2_MSG_CHANNEL_OPEN);
1601: packet_put_cstring("tun@openssh.com");
1602: packet_put_int(c->self);
1603: packet_put_int(c->local_window_max);
1604: packet_put_int(c->local_maxpacket);
1605: packet_put_int(tun_mode);
1606: packet_put_int(remote_tun);
1607: packet_send();
1608:
1.306 djm 1609: return ifname;
1.40 markus 1610: }
1611:
1.22 markus 1612: /* XXXX move to generic input handler */
1.264 markus 1613: static int
1.297 markus 1614: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1615: {
1616: Channel *c = NULL;
1617: char *ctype;
1618: int rchan;
1.102 markus 1619: u_int rmaxpack, rwindow, len;
1.22 markus 1620:
1621: ctype = packet_get_string(&len);
1622: rchan = packet_get_int();
1623: rwindow = packet_get_int();
1624: rmaxpack = packet_get_int();
1625:
1.24 markus 1626: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1627: ctype, rchan, rwindow, rmaxpack);
1628:
1.40 markus 1629: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1630: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1631: rmaxpack);
1.261 millert 1632: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1633: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1634: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1635: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1636: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1637: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1638: }
1.289 markus 1639: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1640: debug3("proxied to downstream: %s", ctype);
1641: } else if (c != NULL) {
1.22 markus 1642: debug("confirm %s", ctype);
1643: c->remote_id = rchan;
1.304 djm 1644: c->have_remote_id = 1;
1.22 markus 1645: c->remote_window = rwindow;
1646: c->remote_maxpacket = rmaxpack;
1.69 markus 1647: if (c->type != SSH_CHANNEL_CONNECTING) {
1648: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1649: packet_put_int(c->remote_id);
1650: packet_put_int(c->self);
1651: packet_put_int(c->local_window);
1652: packet_put_int(c->local_maxpacket);
1653: packet_send();
1654: }
1.22 markus 1655: } else {
1656: debug("failure %s", ctype);
1657: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1658: packet_put_int(rchan);
1659: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.310 djm 1660: packet_put_cstring("open failed");
1661: packet_put_cstring("");
1.22 markus 1662: packet_send();
1663: }
1.250 djm 1664: free(ctype);
1.264 markus 1665: return 0;
1.22 markus 1666: }
1.267 djm 1667:
1.264 markus 1668: static int
1.297 markus 1669: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1670: {
1671: Channel *c = NULL;
1.123 djm 1672: int exitval, id, reply, success = 0;
1.48 markus 1673: char *rtype;
1674:
1675: id = packet_get_int();
1.303 djm 1676: c = channel_lookup(ssh, id);
1.297 markus 1677: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1678: return 0;
1.48 markus 1679: rtype = packet_get_string(NULL);
1680: reply = packet_get_char();
1681:
1682: debug("client_input_channel_req: channel %d rtype %s reply %d",
1683: id, rtype, reply);
1684:
1.128 djm 1685: if (id == -1) {
1686: error("client_input_channel_req: request for channel -1");
1.289 markus 1687: } else if (c == NULL) {
1.197 djm 1688: error("client_input_channel_req: channel %d: "
1689: "unknown channel", id);
1.193 markus 1690: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1691: packet_check_eom();
1.303 djm 1692: chan_rcvd_eow(ssh, c);
1.48 markus 1693: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1694: exitval = packet_get_int();
1.217 djm 1695: if (c->ctl_chan != -1) {
1.303 djm 1696: mux_exit_message(ssh, c, exitval);
1.215 djm 1697: success = 1;
1698: } else if (id == session_ident) {
1699: /* Record exit value of local session */
1.123 djm 1700: success = 1;
1701: exit_status = exitval;
1.215 djm 1702: } else {
1.218 djm 1703: /* Probably for a mux channel that has already closed */
1704: debug("%s: no sink for exit-status on channel %d",
1705: __func__, id);
1.123 djm 1706: }
1.93 markus 1707: packet_check_eom();
1.48 markus 1708: }
1.259 djm 1709: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1710: if (!c->have_remote_id)
1711: fatal("%s: channel %d: no remote_id",
1712: __func__, c->self);
1.48 markus 1713: packet_start(success ?
1714: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 1715: packet_put_int(c->remote_id);
1.48 markus 1716: packet_send();
1717: }
1.250 djm 1718: free(rtype);
1.264 markus 1719: return 0;
1.48 markus 1720: }
1.267 djm 1721:
1.269 djm 1722: struct hostkeys_update_ctx {
1723: /* The hostname and (optionally) IP address string for the server */
1724: char *host_str, *ip_str;
1725:
1726: /*
1727: * Keys received from the server and a flag for each indicating
1728: * whether they already exist in known_hosts.
1729: * keys_seen is filled in by hostkeys_find() and later (for new
1730: * keys) by client_global_hostkeys_private_confirm().
1731: */
1732: struct sshkey **keys;
1733: int *keys_seen;
1.294 djm 1734: size_t nkeys, nnew;
1.269 djm 1735:
1736: /*
1737: * Keys that are in known_hosts, but were not present in the update
1738: * from the server (i.e. scheduled to be deleted).
1739: * Filled in by hostkeys_find().
1740: */
1741: struct sshkey **old_keys;
1742: size_t nold;
1743: };
1744:
1745: static void
1746: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1747: {
1748: size_t i;
1749:
1750: if (ctx == NULL)
1751: return;
1752: for (i = 0; i < ctx->nkeys; i++)
1753: sshkey_free(ctx->keys[i]);
1754: free(ctx->keys);
1755: free(ctx->keys_seen);
1756: for (i = 0; i < ctx->nold; i++)
1757: sshkey_free(ctx->old_keys[i]);
1758: free(ctx->old_keys);
1759: free(ctx->host_str);
1760: free(ctx->ip_str);
1761: free(ctx);
1762: }
1763:
1764: static int
1765: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1766: {
1767: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1768: size_t i;
1769: struct sshkey **tmp;
1770:
1.293 djm 1771: if (l->status != HKF_STATUS_MATCHED || l->key == NULL)
1.269 djm 1772: return 0;
1773:
1774: /* Mark off keys we've already seen for this host */
1775: for (i = 0; i < ctx->nkeys; i++) {
1776: if (sshkey_equal(l->key, ctx->keys[i])) {
1777: debug3("%s: found %s key at %s:%ld", __func__,
1778: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1779: ctx->keys_seen[i] = 1;
1780: return 0;
1781: }
1782: }
1783: /* This line contained a key that not offered by the server */
1784: debug3("%s: deprecated %s key at %s:%ld", __func__,
1785: sshkey_ssh_name(l->key), l->path, l->linenum);
1.299 deraadt 1786: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1787: sizeof(*ctx->old_keys))) == NULL)
1.299 deraadt 1788: fatal("%s: recallocarray failed nold = %zu",
1.269 djm 1789: __func__, ctx->nold);
1790: ctx->old_keys = tmp;
1791: ctx->old_keys[ctx->nold++] = l->key;
1792: l->key = NULL;
1793:
1794: return 0;
1795: }
1796:
1797: static void
1798: update_known_hosts(struct hostkeys_update_ctx *ctx)
1799: {
1.271 djm 1800: int r, was_raw = 0;
1801: int loglevel = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK ?
1.269 djm 1802: SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1803: char *fp, *response;
1804: size_t i;
1805:
1806: for (i = 0; i < ctx->nkeys; i++) {
1807: if (ctx->keys_seen[i] != 2)
1808: continue;
1809: if ((fp = sshkey_fingerprint(ctx->keys[i],
1810: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1811: fatal("%s: sshkey_fingerprint failed", __func__);
1812: do_log2(loglevel, "Learned new hostkey: %s %s",
1813: sshkey_type(ctx->keys[i]), fp);
1814: free(fp);
1815: }
1816: for (i = 0; i < ctx->nold; i++) {
1817: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
1818: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1819: fatal("%s: sshkey_fingerprint failed", __func__);
1820: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
1821: sshkey_type(ctx->old_keys[i]), fp);
1822: free(fp);
1823: }
1824: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 1825: if (get_saved_tio() != NULL) {
1826: leave_raw_mode(1);
1827: was_raw = 1;
1828: }
1.269 djm 1829: response = NULL;
1830: for (i = 0; !quit_pending && i < 3; i++) {
1831: free(response);
1832: response = read_passphrase("Accept updated hostkeys? "
1833: "(yes/no): ", RP_ECHO);
1834: if (strcasecmp(response, "yes") == 0)
1835: break;
1836: else if (quit_pending || response == NULL ||
1837: strcasecmp(response, "no") == 0) {
1838: options.update_hostkeys = 0;
1839: break;
1840: } else {
1841: do_log2(loglevel, "Please enter "
1842: "\"yes\" or \"no\"");
1843: }
1844: }
1845: if (quit_pending || i >= 3 || response == NULL)
1846: options.update_hostkeys = 0;
1847: free(response);
1.271 djm 1848: if (was_raw)
1849: enter_raw_mode(1);
1.269 djm 1850: }
1851:
1852: /*
1853: * Now that all the keys are verified, we can go ahead and replace
1854: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
1855: * cancel the operation).
1856: */
1857: if (options.update_hostkeys != 0 &&
1858: (r = hostfile_replace_entries(options.user_hostfiles[0],
1859: ctx->host_str, ctx->ip_str, ctx->keys, ctx->nkeys,
1860: options.hash_known_hosts, 0,
1861: options.fingerprint_hash)) != 0)
1862: error("%s: hostfile_replace_entries failed: %s",
1863: __func__, ssh_err(r));
1864: }
1865:
1866: static void
1.303 djm 1867: client_global_hostkeys_private_confirm(struct ssh *ssh, int type,
1868: u_int32_t seq, void *_ctx)
1.269 djm 1869: {
1870: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1871: size_t i, ndone;
1872: struct sshbuf *signdata;
1.309 djm 1873: int r, kexsigtype, use_kexsigtype;
1.269 djm 1874: const u_char *sig;
1875: size_t siglen;
1876:
1877: if (ctx->nnew == 0)
1878: fatal("%s: ctx->nnew == 0", __func__); /* sanity */
1879: if (type != SSH2_MSG_REQUEST_SUCCESS) {
1880: error("Server failed to confirm ownership of "
1881: "private host keys");
1882: hostkeys_update_ctx_free(ctx);
1883: return;
1884: }
1.309 djm 1885: kexsigtype = sshkey_type_plain(
1886: sshkey_type_from_name(ssh->kex->hostkey_alg));
1887:
1.269 djm 1888: if ((signdata = sshbuf_new()) == NULL)
1889: fatal("%s: sshbuf_new failed", __func__);
1890: /* Don't want to accidentally accept an unbound signature */
1891: if (ssh->kex->session_id_len == 0)
1892: fatal("%s: ssh->kex->session_id_len == 0", __func__);
1893: /*
1894: * Expect a signature for each of the ctx->nnew private keys we
1895: * haven't seen before. They will be in the same order as the
1896: * ctx->keys where the corresponding ctx->keys_seen[i] == 0.
1897: */
1898: for (ndone = i = 0; i < ctx->nkeys; i++) {
1899: if (ctx->keys_seen[i])
1900: continue;
1901: /* Prepare data to be signed: session ID, unique string, key */
1902: sshbuf_reset(signdata);
1.270 djm 1903: if ( (r = sshbuf_put_cstring(signdata,
1904: "hostkeys-prove-00@openssh.com")) != 0 ||
1905: (r = sshbuf_put_string(signdata, ssh->kex->session_id,
1.269 djm 1906: ssh->kex->session_id_len)) != 0 ||
1907: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1908: fatal("%s: failed to prepare signature: %s",
1909: __func__, ssh_err(r));
1910: /* Extract and verify signature */
1911: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1912: error("%s: couldn't parse message: %s",
1913: __func__, ssh_err(r));
1914: goto out;
1915: }
1.309 djm 1916: /*
1917: * For RSA keys, prefer to use the signature type negotiated
1918: * during KEX to the default (SHA1).
1919: */
1920: use_kexsigtype = kexsigtype == KEY_RSA &&
1921: sshkey_type_plain(ctx->keys[i]->type) == KEY_RSA;
1.269 djm 1922: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 1923: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.309 djm 1924: use_kexsigtype ? ssh->kex->hostkey_alg : NULL, 0)) != 0) {
1.269 djm 1925: error("%s: server gave bad signature for %s key %zu",
1926: __func__, sshkey_type(ctx->keys[i]), i);
1927: goto out;
1928: }
1929: /* Key is good. Mark it as 'seen' */
1930: ctx->keys_seen[i] = 2;
1931: ndone++;
1932: }
1933: if (ndone != ctx->nnew)
1934: fatal("%s: ndone != ctx->nnew (%zu / %zu)", __func__,
1935: ndone, ctx->nnew); /* Shouldn't happen */
1936: ssh_packet_check_eom(ssh);
1937:
1938: /* Make the edits to known_hosts */
1939: update_known_hosts(ctx);
1940: out:
1941: hostkeys_update_ctx_free(ctx);
1942: }
1943:
1.267 djm 1944: /*
1.291 djm 1945: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
1946: * Made slightly less trivial by the multiple RSA signature algorithm names.
1947: */
1948: static int
1949: key_accepted_by_hostkeyalgs(const struct sshkey *key)
1950: {
1951: const char *ktype = sshkey_ssh_name(key);
1952: const char *hostkeyalgs = options.hostkeyalgorithms != NULL ?
1953: options.hostkeyalgorithms : KEX_DEFAULT_PK_ALG;
1954:
1955: if (key == NULL || key->type == KEY_UNSPEC)
1956: return 0;
1957: if (key->type == KEY_RSA &&
1958: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
1959: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
1960: return 1;
1961: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
1962: }
1963:
1964: /*
1.270 djm 1965: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 1966: * the server's hostkeys. The keys are checked against the user's
1967: * HostkeyAlgorithms preference before they are accepted.
1968: */
1969: static int
1970: client_input_hostkeys(void)
1971: {
1.269 djm 1972: struct ssh *ssh = active_state; /* XXX */
1.267 djm 1973: const u_char *blob = NULL;
1.269 djm 1974: size_t i, len = 0;
1.267 djm 1975: struct sshbuf *buf = NULL;
1.269 djm 1976: struct sshkey *key = NULL, **tmp;
1977: int r;
1978: char *fp;
1.267 djm 1979: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 1980: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 1981: struct hostkeys_update_ctx *ctx = NULL;
1.267 djm 1982:
1983: if (hostkeys_seen)
1984: fatal("%s: server already sent hostkeys", __func__);
1.269 djm 1985: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
1986: options.batch_mode)
1987: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 1988: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
1989: return 1;
1.272 djm 1990:
1991: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 1992: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 1993: sshkey_free(key);
1994: key = NULL;
1.269 djm 1995: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
1996: error("%s: couldn't parse message: %s",
1997: __func__, ssh_err(r));
1998: goto out;
1999: }
1.270 djm 2000: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
2001: error("%s: parse key: %s", __func__, ssh_err(r));
2002: goto out;
2003: }
1.267 djm 2004: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2005: SSH_FP_DEFAULT);
2006: debug3("%s: received %s key %s", __func__,
2007: sshkey_type(key), fp);
2008: free(fp);
1.275 markus 2009:
1.291 djm 2010: if (!key_accepted_by_hostkeyalgs(key)) {
1.267 djm 2011: debug3("%s: %s key not permitted by HostkeyAlgorithms",
2012: __func__, sshkey_ssh_name(key));
2013: continue;
2014: }
1.269 djm 2015: /* Skip certs */
2016: if (sshkey_is_cert(key)) {
2017: debug3("%s: %s key is a certificate; skipping",
2018: __func__, sshkey_ssh_name(key));
2019: continue;
2020: }
2021: /* Ensure keys are unique */
2022: for (i = 0; i < ctx->nkeys; i++) {
2023: if (sshkey_equal(key, ctx->keys[i])) {
2024: error("%s: received duplicated %s host key",
2025: __func__, sshkey_ssh_name(key));
2026: goto out;
2027: }
2028: }
2029: /* Key is good, record it */
1.299 deraadt 2030: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2031: sizeof(*ctx->keys))) == NULL)
1.299 deraadt 2032: fatal("%s: recallocarray failed nkeys = %zu",
1.269 djm 2033: __func__, ctx->nkeys);
2034: ctx->keys = tmp;
2035: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2036: key = NULL;
2037: }
2038:
1.269 djm 2039: if (ctx->nkeys == 0) {
1.270 djm 2040: debug("%s: server sent no hostkeys", __func__);
1.267 djm 2041: goto out;
2042: }
1.270 djm 2043:
1.269 djm 2044: if ((ctx->keys_seen = calloc(ctx->nkeys,
2045: sizeof(*ctx->keys_seen))) == NULL)
2046: fatal("%s: calloc failed", __func__);
1.267 djm 2047:
1.268 djm 2048: get_hostfile_hostname_ipaddr(host,
2049: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2050: options.port, &ctx->host_str,
2051: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2052:
1.269 djm 2053: /* Find which keys we already know about. */
2054: if ((r = hostkeys_foreach(options.user_hostfiles[0], hostkeys_find,
2055: ctx, ctx->host_str, ctx->ip_str,
2056: HKF_WANT_PARSE_KEY|HKF_WANT_MATCH)) != 0) {
2057: error("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1.267 djm 2058: goto out;
2059: }
2060:
1.269 djm 2061: /* Figure out if we have any new keys to add */
2062: ctx->nnew = 0;
2063: for (i = 0; i < ctx->nkeys; i++) {
2064: if (!ctx->keys_seen[i])
2065: ctx->nnew++;
2066: }
2067:
2068: debug3("%s: %zu keys from server: %zu new, %zu retained. %zu to remove",
2069: __func__, ctx->nkeys, ctx->nnew, ctx->nkeys - ctx->nnew, ctx->nold);
2070:
2071: if (ctx->nnew == 0 && ctx->nold != 0) {
2072: /* We have some keys to remove. Just do it. */
2073: update_known_hosts(ctx);
2074: } else if (ctx->nnew != 0) {
2075: /*
2076: * We have received hitherto-unseen keys from the server.
2077: * Ask the server to confirm ownership of the private halves.
2078: */
2079: debug3("%s: asking server to prove ownership for %zu keys",
2080: __func__, ctx->nnew);
2081: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2082: (r = sshpkt_put_cstring(ssh,
1.270 djm 2083: "hostkeys-prove-00@openssh.com")) != 0 ||
1.269 djm 2084: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
2085: fatal("%s: cannot prepare packet: %s",
2086: __func__, ssh_err(r));
2087: if ((buf = sshbuf_new()) == NULL)
2088: fatal("%s: sshbuf_new", __func__);
2089: for (i = 0; i < ctx->nkeys; i++) {
2090: if (ctx->keys_seen[i])
2091: continue;
2092: sshbuf_reset(buf);
2093: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0)
2094: fatal("%s: sshkey_putb: %s",
2095: __func__, ssh_err(r));
2096: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
2097: fatal("%s: sshpkt_put_string: %s",
2098: __func__, ssh_err(r));
2099: }
2100: if ((r = sshpkt_send(ssh)) != 0)
2101: fatal("%s: sshpkt_send: %s", __func__, ssh_err(r));
2102: client_register_global_confirm(
2103: client_global_hostkeys_private_confirm, ctx);
2104: ctx = NULL; /* will be freed in callback */
2105: }
2106:
1.267 djm 2107: /* Success */
2108: out:
1.269 djm 2109: hostkeys_update_ctx_free(ctx);
1.267 djm 2110: sshkey_free(key);
2111: sshbuf_free(buf);
1.269 djm 2112: /*
2113: * NB. Return success for all cases. The server doesn't need to know
2114: * what the client does with its hosts file.
2115: */
2116: return 1;
1.267 djm 2117: }
2118:
1.264 markus 2119: static int
1.297 markus 2120: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2121: {
2122: char *rtype;
2123: int want_reply;
2124: int success = 0;
2125:
1.267 djm 2126: rtype = packet_get_cstring(NULL);
1.95 markus 2127: want_reply = packet_get_char();
1.117 markus 2128: debug("client_input_global_request: rtype %s want_reply %d",
2129: rtype, want_reply);
1.270 djm 2130: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.267 djm 2131: success = client_input_hostkeys();
1.95 markus 2132: if (want_reply) {
2133: packet_start(success ?
2134: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
2135: packet_send();
2136: packet_write_wait();
2137: }
1.250 djm 2138: free(rtype);
1.264 markus 2139: return 0;
1.95 markus 2140: }
1.22 markus 2141:
1.123 djm 2142: void
1.303 djm 2143: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.190 djm 2144: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 2145: {
1.313 ! djm 2146: int i, j, matched, len;
! 2147: char *name, *val;
1.132 djm 2148: Channel *c = NULL;
1.123 djm 2149:
2150: debug2("%s: id %d", __func__, id);
2151:
1.303 djm 2152: if ((c = channel_lookup(ssh, id)) == NULL)
2153: fatal("%s: channel %d: unknown channel", __func__, id);
1.224 djm 2154:
2155: packet_set_interactive(want_tty,
2156: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2157:
1.123 djm 2158: if (want_tty) {
2159: struct winsize ws;
2160:
2161: /* Store window size in the packet. */
2162: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2163: memset(&ws, 0, sizeof(ws));
2164:
1.303 djm 2165: channel_request_start(ssh, id, "pty-req", 1);
2166: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.123 djm 2167: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 2168: packet_put_int((u_int)ws.ws_col);
2169: packet_put_int((u_int)ws.ws_row);
2170: packet_put_int((u_int)ws.ws_xpixel);
2171: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 2172: if (tiop == NULL)
2173: tiop = get_saved_tio();
2174: tty_make_modes(-1, tiop);
1.123 djm 2175: packet_send();
2176: /* XXX wait for reply */
1.132 djm 2177: c->client_tty = 1;
1.123 djm 2178: }
2179:
2180: /* Transfer any environment variables from client to server */
1.126 djm 2181: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2182: debug("Sending environment.");
1.126 djm 2183: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2184: /* Split */
1.126 djm 2185: name = xstrdup(env[i]);
1.123 djm 2186: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2187: free(name);
1.123 djm 2188: continue;
2189: }
2190: *val++ = '\0';
2191:
2192: matched = 0;
2193: for (j = 0; j < options.num_send_env; j++) {
2194: if (match_pattern(name, options.send_env[j])) {
2195: matched = 1;
2196: break;
2197: }
2198: }
2199: if (!matched) {
2200: debug3("Ignored env %s", name);
1.250 djm 2201: free(name);
1.123 djm 2202: continue;
2203: }
2204:
2205: debug("Sending env %s = %s", name, val);
1.303 djm 2206: channel_request_start(ssh, id, "env", 0);
1.123 djm 2207: packet_put_cstring(name);
2208: packet_put_cstring(val);
2209: packet_send();
1.250 djm 2210: free(name);
1.123 djm 2211: }
1.313 ! djm 2212: }
! 2213: for (i = 0; i < options.num_setenv; i++) {
! 2214: /* Split */
! 2215: name = xstrdup(options.setenv[i]);
! 2216: if ((val = strchr(name, '=')) == NULL) {
! 2217: free(name);
! 2218: continue;
! 2219: }
! 2220: *val++ = '\0';
! 2221:
! 2222: debug("Setting env %s = %s", name, val);
! 2223: channel_request_start(ssh, id, "env", 0);
! 2224: packet_put_cstring(name);
! 2225: packet_put_cstring(val);
! 2226: packet_send();
! 2227: free(name);
1.123 djm 2228: }
2229:
2230: len = buffer_len(cmd);
2231: if (len > 0) {
2232: if (len > 900)
2233: len = 900;
2234: if (want_subsystem) {
1.190 djm 2235: debug("Sending subsystem: %.*s",
2236: len, (u_char*)buffer_ptr(cmd));
1.303 djm 2237: channel_request_start(ssh, id, "subsystem", 1);
2238: client_expect_confirm(ssh, id, "subsystem",
2239: CONFIRM_CLOSE);
1.123 djm 2240: } else {
1.190 djm 2241: debug("Sending command: %.*s",
2242: len, (u_char*)buffer_ptr(cmd));
1.303 djm 2243: channel_request_start(ssh, id, "exec", 1);
2244: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2245: }
2246: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2247: packet_send();
2248: } else {
1.303 djm 2249: channel_request_start(ssh, id, "shell", 1);
2250: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.123 djm 2251: packet_send();
2252: }
2253: }
2254:
1.77 itojun 2255: static void
1.292 djm 2256: client_init_dispatch(void)
1.16 markus 2257: {
1.55 markus 2258: dispatch_init(&dispatch_protocol_error);
1.100 markus 2259:
1.16 markus 2260: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2261: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2262: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2263: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2264: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2265: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2266: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2267: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2268: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2269: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2270: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2271: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2272:
2273: /* rekeying */
2274: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2275:
2276: /* global request reply messages */
2277: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2278: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2279: }
2280:
2281: void
2282: client_stop_mux(void)
2283: {
2284: if (options.control_path != NULL && muxserver_sock != -1)
2285: unlink(options.control_path);
2286: /*
1.247 dtucker 2287: * If we are in persist mode, or don't have a shell, signal that we
2288: * should close when all active channels are closed.
1.232 djm 2289: */
1.247 dtucker 2290: if (options.control_persist || no_shell_flag) {
1.232 djm 2291: session_closed = 1;
1.235 djm 2292: setproctitle("[stopped mux]");
2293: }
1.113 markus 2294: }
2295:
2296: /* client specific fatal cleanup */
2297: void
1.114 markus 2298: cleanup_exit(int i)
1.113 markus 2299: {
1.233 djm 2300: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2301: leave_non_blocking();
1.192 djm 2302: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2303: unlink(options.control_path);
1.223 djm 2304: ssh_kill_proxy_command();
1.114 markus 2305: _exit(i);
1.1 deraadt 2306: }
![[BACK]](/icons/back.gif){kind=icon}
Return to clientloop.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh