Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.315
1.315 ! markus 1: /* $OpenBSD: clientloop.c,v 1.314 2018/06/26 02:02:36 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"
1.315 ! markus 86: #include "sshbuf.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. */
1.315 ! markus 148: static struct sshbuf *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:
1.315 ! markus 183: void ssh_process_session2_setup(int, int, int, struct sshbuf *);
1.123 djm 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();
1.315 ! markus 488: int r, ret;
1.117 markus 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) {
1.51 markus 541: /*
542: * We have to clear the select masks, because we return.
543: * We have to return, because the mainloop checks for the flags
544: * set by the signal handlers.
545: */
1.87 markus 546: memset(*readsetp, 0, *nallocp);
547: memset(*writesetp, 0, *nallocp);
1.50 deraadt 548:
1.11 markus 549: if (errno == EINTR)
550: return;
551: /* Note: we might still have data in the buffers. */
1.315 ! markus 552: if ((r = sshbuf_putf(stderr_buffer,
! 553: "select: %s\r\n", strerror(errno))) != 0)
! 554: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.11 markus 555: quit_pending = 1;
1.249 dtucker 556: } else if (ret == 0) {
557: /*
558: * Timeout. Could have been either keepalive or rekeying.
559: * Keepalive we check here, rekeying is checked in clientloop.
560: */
1.251 dtucker 561: if (server_alive_time != 0 && server_alive_time <= monotime())
1.249 dtucker 562: server_alive_check();
563: }
564:
1.11 markus 565: }
566:
1.77 itojun 567: static void
1.315 ! markus 568: client_suspend_self(struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr)
1.1 deraadt 569: {
1.11 markus 570: /* Flush stdout and stderr buffers. */
1.315 ! markus 571: if (sshbuf_len(bout) > 0)
! 572: atomicio(vwrite, fileno(stdout), sshbuf_mutable_ptr(bout),
! 573: sshbuf_len(bout));
! 574: if (sshbuf_len(berr) > 0)
! 575: atomicio(vwrite, fileno(stderr), sshbuf_mutable_ptr(berr),
! 576: sshbuf_len(berr));
1.11 markus 577:
1.233 djm 578: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 579:
1.305 djm 580: sshbuf_reset(bin);
581: sshbuf_reset(bout);
582: sshbuf_reset(berr);
1.11 markus 583:
584: /* Send the suspend signal to the program itself. */
585: kill(getpid(), SIGTSTP);
586:
1.132 djm 587: /* Reset window sizes in case they have changed */
588: received_window_change_signal = 1;
1.11 markus 589:
1.233 djm 590: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 591: }
592:
1.77 itojun 593: static void
1.161 deraadt 594: client_process_net_input(fd_set *readset)
1.11 markus 595: {
1.17 markus 596: char buf[8192];
1.315 ! markus 597: int r, len;
1.11 markus 598:
1.13 markus 599: /*
600: * Read input from the server, and add any such data to the buffer of
601: * the packet subsystem.
602: */
1.11 markus 603: if (FD_ISSET(connection_in, readset)) {
604: /* Read as much as possible. */
1.280 markus 605: len = read(connection_in, buf, sizeof(buf));
606: if (len == 0) {
1.197 djm 607: /*
608: * Received EOF. The remote host has closed the
609: * connection.
610: */
1.315 ! markus 611: if ((r = sshbuf_putf(stderr_buffer,
1.197 djm 612: "Connection to %.300s closed by remote host.\r\n",
1.315 ! markus 613: host)) != 0)
! 614: fatal("%s: buffer error: %s",
! 615: __func__, ssh_err(r));
1.1 deraadt 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: */
1.315 ! markus 631: if ((r = sshbuf_putf(stderr_buffer,
1.197 djm 632: "Read from remote host %.300s: %.100s\r\n",
1.315 ! markus 633: host, strerror(errno))) != 0)
! 634: fatal("%s: buffer error: %s",
! 635: __func__, ssh_err(r));
1.11 markus 636: quit_pending = 1;
637: return;
638: }
639: packet_process_incoming(buf, len);
640: }
1.17 markus 641: }
1.16 markus 642:
1.97 jakob 643: static void
1.303 djm 644: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 645: {
1.190 djm 646: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
647: char errmsg[256];
1.315 ! markus 648: int r, tochan;
1.190 djm 649:
1.234 djm 650: /*
651: * If a TTY was explicitly requested, then a failure to allocate
652: * one is fatal.
653: */
654: if (cr->action == CONFIRM_TTY &&
655: (options.request_tty == REQUEST_TTY_FORCE ||
656: options.request_tty == REQUEST_TTY_YES))
657: cr->action = CONFIRM_CLOSE;
658:
1.312 djm 659: /* XXX suppress on mux _client_ quietmode */
1.190 djm 660: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 661: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 662:
663: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
664: debug2("%s request accepted on channel %d",
665: cr->request_type, c->self);
666: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
667: if (tochan) {
668: snprintf(errmsg, sizeof(errmsg),
669: "%s request failed\r\n", cr->request_type);
670: } else {
671: snprintf(errmsg, sizeof(errmsg),
672: "%s request failed on channel %d",
673: cr->request_type, c->self);
674: }
675: /* If error occurred on primary session channel, then exit */
1.234 djm 676: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 677: fatal("%s", errmsg);
1.234 djm 678: /*
679: * If error occurred on mux client, append to
680: * their stderr.
681: */
682: if (tochan) {
1.315 ! markus 683: if ((r = sshbuf_put(c->extended, errmsg,
! 684: strlen(errmsg))) != 0)
! 685: fatal("%s: buffer error %s", __func__,
! 686: ssh_err(r));
1.234 djm 687: } else
1.190 djm 688: error("%s", errmsg);
1.234 djm 689: if (cr->action == CONFIRM_TTY) {
690: /*
691: * If a TTY allocation error occurred, then arrange
692: * for the correct TTY to leave raw mode.
693: */
694: if (c->self == session_ident)
695: leave_raw_mode(0);
696: else
1.303 djm 697: mux_tty_alloc_failed(ssh, c);
1.234 djm 698: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 699: chan_read_failed(ssh, c);
700: chan_write_failed(ssh, c);
1.190 djm 701: }
702: }
1.250 djm 703: free(cr);
1.190 djm 704: }
705:
706: static void
1.303 djm 707: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 708: {
1.250 djm 709: free(ctx);
1.190 djm 710: }
1.129 deraadt 711:
1.236 djm 712: void
1.303 djm 713: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 714: enum confirm_action action)
1.190 djm 715: {
1.255 djm 716: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 717:
1.190 djm 718: cr->request_type = request;
1.234 djm 719: cr->action = action;
1.123 djm 720:
1.303 djm 721: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 722: client_abandon_status_confirm, cr);
1.196 djm 723: }
724:
725: void
726: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
727: {
1.201 djm 728: struct global_confirm *gc, *last_gc;
1.196 djm 729:
730: /* Coalesce identical callbacks */
1.201 djm 731: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
732: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
733: if (++last_gc->ref_count >= INT_MAX)
734: fatal("%s: last_gc->ref_count = %d",
735: __func__, last_gc->ref_count);
1.196 djm 736: return;
737: }
738:
1.255 djm 739: gc = xcalloc(1, sizeof(*gc));
1.196 djm 740: gc->cb = cb;
741: gc->ctx = ctx;
742: gc->ref_count = 1;
743: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 744: }
745:
746: static void
1.303 djm 747: process_cmdline(struct ssh *ssh)
1.97 jakob 748: {
749: void (*handler)(int);
1.261 millert 750: char *s, *cmd;
751: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
752: struct Forward fwd;
1.97 jakob 753:
1.257 tedu 754: memset(&fwd, 0, sizeof(fwd));
1.183 djm 755:
1.233 djm 756: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 757: handler = signal(SIGINT, SIG_IGN);
1.99 markus 758: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 759: if (s == NULL)
760: goto out;
1.256 deraadt 761: while (isspace((u_char)*s))
1.97 jakob 762: s++;
1.121 djm 763: if (*s == '-')
764: s++; /* Skip cmdline '-', if any */
1.120 dtucker 765: if (*s == '\0')
1.97 jakob 766: goto out;
1.121 djm 767:
1.122 djm 768: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 769: logit("Commands:");
1.164 djm 770: logit(" -L[bind_address:]port:host:hostport "
771: "Request local forward");
772: logit(" -R[bind_address:]port:host:hostport "
773: "Request remote forward");
1.204 stevesk 774: logit(" -D[bind_address:]port "
775: "Request dynamic forward");
1.237 markus 776: logit(" -KL[bind_address:]port "
777: "Cancel local forward");
1.165 stevesk 778: logit(" -KR[bind_address:]port "
1.164 djm 779: "Cancel remote forward");
1.237 markus 780: logit(" -KD[bind_address:]port "
781: "Cancel dynamic forward");
1.146 reyk 782: if (!options.permit_local_command)
783: goto out;
1.164 djm 784: logit(" !args "
785: "Execute local command");
1.146 reyk 786: goto out;
787: }
788:
789: if (*s == '!' && options.permit_local_command) {
790: s++;
791: ssh_local_cmd(s);
1.121 djm 792: goto out;
793: }
794:
795: if (*s == 'K') {
796: delete = 1;
797: s++;
798: }
1.204 stevesk 799: if (*s == 'L')
800: local = 1;
801: else if (*s == 'R')
802: remote = 1;
803: else if (*s == 'D')
804: dynamic = 1;
805: else {
1.109 itojun 806: logit("Invalid command.");
1.97 jakob 807: goto out;
808: }
1.204 stevesk 809:
1.256 deraadt 810: while (isspace((u_char)*++s))
1.179 tedu 811: ;
1.97 jakob 812:
1.217 djm 813: /* XXX update list of forwards in options */
1.121 djm 814: if (delete) {
1.261 millert 815: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
816: if (!parse_forward(&fwd, s, 1, 0)) {
817: logit("Bad forwarding close specification.");
1.121 djm 818: goto out;
819: }
1.237 markus 820: if (remote)
1.303 djm 821: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 822: else if (dynamic)
1.303 djm 823: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 824: 0, &options.fwd_opts) > 0;
1.237 markus 825: else
1.303 djm 826: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 827: CHANNEL_CANCEL_PORT_STATIC,
828: &options.fwd_opts) > 0;
1.237 markus 829: if (!ok) {
1.290 dtucker 830: logit("Unknown port forwarding.");
1.237 markus 831: goto out;
832: }
833: logit("Canceled forwarding.");
1.121 djm 834: } else {
1.209 djm 835: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 836: logit("Bad forwarding specification.");
837: goto out;
838: }
1.204 stevesk 839: if (local || dynamic) {
1.303 djm 840: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 841: &options.fwd_opts)) {
1.121 djm 842: logit("Port forwarding failed.");
843: goto out;
844: }
1.135 djm 845: } else {
1.303 djm 846: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 847: logit("Port forwarding failed.");
848: goto out;
849: }
1.135 djm 850: }
1.121 djm 851: logit("Forwarding port.");
852: }
853:
1.97 jakob 854: out:
855: signal(SIGINT, handler);
1.233 djm 856: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 857: free(cmd);
858: free(fwd.listen_host);
1.261 millert 859: free(fwd.listen_path);
1.250 djm 860: free(fwd.connect_host);
1.261 millert 861: free(fwd.connect_path);
1.97 jakob 862: }
863:
1.244 dtucker 864: /* reasons to suppress output of an escape command in help output */
865: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 866: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
867: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
868: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.244 dtucker 869: struct escape_help_text {
870: const char *cmd;
871: const char *text;
872: unsigned int flags;
873: };
874: static struct escape_help_text esc_txt[] = {
875: {".", "terminate session", SUPPRESS_MUXMASTER},
876: {".", "terminate connection (and any multiplexed sessions)",
877: SUPPRESS_MUXCLIENT},
1.292 djm 878: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.244 dtucker 879: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1.292 djm 880: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 881: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 882: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
883: {"#", "list forwarded connections", SUPPRESS_NEVER},
884: {"&", "background ssh (when waiting for connections to terminate)",
885: SUPPRESS_MUXCLIENT},
886: {"?", "this message", SUPPRESS_NEVER},
887: };
888:
889: static void
1.315 ! markus 890: print_escape_help(struct sshbuf *b, int escape_char, int mux_client,
! 891: int using_stderr)
1.244 dtucker 892: {
893: unsigned int i, suppress_flags;
1.315 ! markus 894: int r;
1.244 dtucker 895:
1.315 ! markus 896: if ((r = sshbuf_putf(b,
! 897: "%c?\r\nSupported escape sequences:\r\n", escape_char)) != 0)
! 898: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.244 dtucker 899:
1.292 djm 900: suppress_flags =
1.244 dtucker 901: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
902: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
903: (using_stderr ? 0 : SUPPRESS_SYSLOG);
904:
905: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
906: if (esc_txt[i].flags & suppress_flags)
907: continue;
1.315 ! markus 908: if ((r = sshbuf_putf(b, " %c%-3s - %s\r\n",
! 909: escape_char, esc_txt[i].cmd, esc_txt[i].text)) != 0)
! 910: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.244 dtucker 911: }
912:
1.315 ! markus 913: if ((r = sshbuf_putf(b,
1.246 dtucker 914: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 915: "(Note that escapes are only recognized immediately after "
1.315 ! markus 916: "newline.)\r\n", escape_char, escape_char)) != 0)
! 917: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.244 dtucker 918: }
919:
1.314 djm 920: /*
1.296 naddy 921: * Process the characters one by one.
1.195 djm 922: */
1.77 itojun 923: static int
1.303 djm 924: process_escapes(struct ssh *ssh, Channel *c,
1.315 ! markus 925: struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr,
1.195 djm 926: char *buf, int len)
1.31 markus 927: {
928: pid_t pid;
1.315 ! markus 929: int r, bytes = 0;
1.42 markus 930: u_int i;
931: u_char ch;
1.31 markus 932: char *s;
1.294 djm 933: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
934: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 935:
1.294 djm 936: if (c->filter_ctx == NULL)
937: return 0;
1.314 djm 938:
1.139 djm 939: if (len <= 0)
940: return (0);
941:
942: for (i = 0; i < (u_int)len; i++) {
1.31 markus 943: /* Get one character at a time. */
944: ch = buf[i];
945:
1.294 djm 946: if (efc->escape_pending) {
1.31 markus 947: /* We have previously seen an escape character. */
948: /* Clear the flag now. */
1.294 djm 949: efc->escape_pending = 0;
1.31 markus 950:
951: /* Process the escaped character. */
952: switch (ch) {
953: case '.':
954: /* Terminate the connection. */
1.315 ! markus 955: if ((r = sshbuf_putf(berr, "%c.\r\n",
! 956: efc->escape_char)) != 0)
! 957: fatal("%s: buffer error: %s",
! 958: __func__, ssh_err(r));
1.217 djm 959: if (c && c->ctl_chan != -1) {
1.303 djm 960: chan_read_failed(ssh, c);
961: chan_write_failed(ssh, c);
962: if (c->detach_user) {
963: c->detach_user(ssh,
964: c->self, NULL);
965: }
1.253 dtucker 966: c->type = SSH_CHANNEL_ABANDONED;
1.315 ! markus 967: sshbuf_reset(c->input);
1.303 djm 968: chan_ibuf_empty(ssh, c);
1.195 djm 969: return 0;
970: } else
971: quit_pending = 1;
1.31 markus 972: return -1;
973:
974: case 'Z' - 64:
1.195 djm 975: /* XXX support this for mux clients */
1.217 djm 976: if (c && c->ctl_chan != -1) {
1.245 dtucker 977: char b[16];
1.195 djm 978: noescape:
1.245 dtucker 979: if (ch == 'Z' - 64)
980: snprintf(b, sizeof b, "^Z");
981: else
982: snprintf(b, sizeof b, "%c", ch);
1.315 ! markus 983: if ((r = sshbuf_putf(berr,
1.245 dtucker 984: "%c%s escape not available to "
1.195 djm 985: "multiplexed sessions\r\n",
1.315 ! markus 986: efc->escape_char, b)) != 0)
! 987: fatal("%s: buffer error: %s",
! 988: __func__, ssh_err(r));
1.195 djm 989: continue;
990: }
1.197 djm 991: /* Suspend the program. Inform the user */
1.315 ! markus 992: if ((r = sshbuf_putf(berr,
! 993: "%c^Z [suspend ssh]\r\n",
! 994: efc->escape_char)) != 0)
! 995: fatal("%s: buffer error: %s",
! 996: __func__, ssh_err(r));
1.31 markus 997:
998: /* Restore terminal modes and suspend. */
999: client_suspend_self(bin, bout, berr);
1000:
1001: /* We have been continued. */
1002: continue;
1003:
1.111 markus 1004: case 'B':
1.315 ! markus 1005: if ((r = sshbuf_putf(berr,
! 1006: "%cB\r\n", efc->escape_char)) != 0)
! 1007: fatal("%s: buffer error: %s",
! 1008: __func__, ssh_err(r));
1.303 djm 1009: channel_request_start(ssh, c->self, "break", 0);
1.315 ! markus 1010: if ((r = sshpkt_put_u32(ssh, 1000)) != 0 ||
! 1011: (r = sshpkt_send(ssh)) != 0)
! 1012: fatal("%s: %s", __func__,
! 1013: ssh_err(r));
1.111 markus 1014: continue;
1015:
1.54 markus 1016: case 'R':
1.292 djm 1017: if (datafellows & SSH_BUG_NOREKEY)
1018: logit("Server does not "
1019: "support re-keying");
1020: else
1021: need_rekeying = 1;
1.54 markus 1022: continue;
1023:
1.242 dtucker 1024: case 'V':
1025: /* FALLTHROUGH */
1026: case 'v':
1027: if (c && c->ctl_chan != -1)
1028: goto noescape;
1029: if (!log_is_on_stderr()) {
1.315 ! markus 1030: if ((r = sshbuf_putf(berr,
1.242 dtucker 1031: "%c%c [Logging to syslog]\r\n",
1.315 ! markus 1032: efc->escape_char, ch)) != 0)
! 1033: fatal("%s: buffer error: %s",
! 1034: __func__, ssh_err(r));
1.242 dtucker 1035: continue;
1036: }
1037: if (ch == 'V' && options.log_level >
1038: SYSLOG_LEVEL_QUIET)
1039: log_change_level(--options.log_level);
1040: if (ch == 'v' && options.log_level <
1041: SYSLOG_LEVEL_DEBUG3)
1042: log_change_level(++options.log_level);
1.315 ! markus 1043: if ((r = sshbuf_putf(berr,
1.294 djm 1044: "%c%c [LogLevel %s]\r\n",
1045: efc->escape_char, ch,
1.315 ! markus 1046: log_level_name(options.log_level))) != 0)
! 1047: fatal("%s: buffer error: %s",
! 1048: __func__, ssh_err(r));
1.242 dtucker 1049: continue;
1050:
1.31 markus 1051: case '&':
1.217 djm 1052: if (c && c->ctl_chan != -1)
1.195 djm 1053: goto noescape;
1.31 markus 1054: /*
1.197 djm 1055: * Detach the program (continue to serve
1056: * connections, but put in background and no
1057: * more new connections).
1.31 markus 1058: */
1059: /* Restore tty modes. */
1.233 djm 1060: leave_raw_mode(
1061: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1062:
1063: /* Stop listening for new connections. */
1.303 djm 1064: channel_stop_listening(ssh);
1.31 markus 1065:
1.315 ! markus 1066: if ((r = sshbuf_putf(berr,
! 1067: "%c& [backgrounded]\n", efc->escape_char))
! 1068: != 0)
! 1069: fatal("%s: buffer error: %s",
! 1070: __func__, ssh_err(r));
1.31 markus 1071:
1072: /* Fork into background. */
1073: pid = fork();
1074: if (pid < 0) {
1075: error("fork: %.100s", strerror(errno));
1076: continue;
1077: }
1078: if (pid != 0) { /* This is the parent. */
1079: /* The parent just exits. */
1080: exit(0);
1081: }
1082: /* The child continues serving connections. */
1.292 djm 1083: /* fake EOF on stdin */
1.315 ! markus 1084: if ((r = sshbuf_put_u8(bin, 4)) != 0)
! 1085: fatal("%s: buffer error: %s",
! 1086: __func__, ssh_err(r));
1.292 djm 1087: return -1;
1.31 markus 1088: case '?':
1.294 djm 1089: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1090: (c && c->ctl_chan != -1),
1091: log_is_on_stderr());
1.31 markus 1092: continue;
1093:
1094: case '#':
1.315 ! markus 1095: if ((r = sshbuf_putf(berr, "%c#\r\n",
! 1096: efc->escape_char)) != 0)
! 1097: fatal("%s: buffer error: %s",
! 1098: __func__, ssh_err(r));
1.303 djm 1099: s = channel_open_message(ssh);
1.315 ! markus 1100: if ((r = sshbuf_put(berr, s, strlen(s))) != 0)
! 1101: fatal("%s: buffer error: %s",
! 1102: __func__, ssh_err(r));
1.250 djm 1103: free(s);
1.97 jakob 1104: continue;
1105:
1106: case 'C':
1.217 djm 1107: if (c && c->ctl_chan != -1)
1.206 djm 1108: goto noescape;
1.303 djm 1109: process_cmdline(ssh);
1.31 markus 1110: continue;
1111:
1112: default:
1.294 djm 1113: if (ch != efc->escape_char) {
1.315 ! markus 1114: if ((r = sshbuf_put_u8(bin,
! 1115: efc->escape_char)) != 0)
! 1116: fatal("%s: buffer error: %s",
! 1117: __func__, ssh_err(r));
1.31 markus 1118: bytes++;
1119: }
1120: /* Escaped characters fall through here */
1121: break;
1122: }
1123: } else {
1124: /*
1.197 djm 1125: * The previous character was not an escape char.
1126: * Check if this is an escape.
1.31 markus 1127: */
1.294 djm 1128: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1129: /*
1130: * It is. Set the flag and continue to
1131: * next character.
1132: */
1.294 djm 1133: efc->escape_pending = 1;
1.31 markus 1134: continue;
1135: }
1136: }
1137:
1138: /*
1139: * Normal character. Record whether it was a newline,
1140: * and append it to the buffer.
1141: */
1142: last_was_cr = (ch == '\r' || ch == '\n');
1.315 ! markus 1143: if ((r = sshbuf_put_u8(bin, ch)) != 0)
! 1144: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.31 markus 1145: bytes++;
1146: }
1147: return bytes;
1148: }
1149:
1.13 markus 1150: /*
1.15 markus 1151: * Get packets from the connection input buffer, and process them as long as
1152: * there are packets available.
1153: *
1154: * Any unknown packets received during the actual
1155: * session cause the session to terminate. This is
1156: * intended to make debugging easier since no
1157: * confirmations are sent. Any compatible protocol
1158: * extensions must be negotiated during the
1159: * preparatory phase.
1160: */
1161:
1.77 itojun 1162: static void
1.49 itojun 1163: client_process_buffered_input_packets(void)
1.15 markus 1164: {
1.298 markus 1165: ssh_dispatch_run_fatal(active_state, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1166: }
1167:
1.31 markus 1168: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1169:
1.195 djm 1170: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1171: void *
1172: client_new_escape_filter_ctx(int escape_char)
1173: {
1174: struct escape_filter_ctx *ret;
1175:
1.255 djm 1176: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1177: ret->escape_pending = 0;
1178: ret->escape_char = escape_char;
1179: return (void *)ret;
1180: }
1181:
1.198 djm 1182: /* Free the escape filter context on channel free */
1183: void
1.303 djm 1184: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1185: {
1.250 djm 1186: free(ctx);
1.198 djm 1187: }
1188:
1.195 djm 1189: int
1.303 djm 1190: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1191: {
1.190 djm 1192: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1193: return 0;
1194:
1.303 djm 1195: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1196: buf, len);
1.30 markus 1197: }
1198:
1.77 itojun 1199: static void
1.303 djm 1200: client_channel_closed(struct ssh *ssh, int id, void *arg)
1.60 markus 1201: {
1.303 djm 1202: channel_cancel_cleanup(ssh, id);
1.60 markus 1203: session_closed = 1;
1.233 djm 1204: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1205: }
1206:
1.15 markus 1207: /*
1.13 markus 1208: * Implements the interactive session with the server. This is called after
1209: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1210: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1211: * used as an escape character for terminating or suspending the session.
1.13 markus 1212: */
1.20 markus 1213: int
1.303 djm 1214: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1215: int ssh2_chan_id)
1.1 deraadt 1216: {
1.46 markus 1217: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1218: double start_time, total_time;
1.284 djm 1219: int r, max_fd = 0, max_fd2 = 0, len;
1.200 markus 1220: u_int64_t ibytes, obytes;
1.130 avsm 1221: u_int nalloc = 0;
1.11 markus 1222: char buf[100];
1223:
1224: debug("Entering interactive session.");
1.277 semarie 1225:
1.278 semarie 1226: if (options.control_master &&
1.286 djm 1227: !option_clear_or_none(options.control_path)) {
1.278 semarie 1228: debug("pledge: id");
1.285 tb 1229: if (pledge("stdio rpath wpath cpath unix inet dns recvfd proc exec id tty",
1.278 semarie 1230: NULL) == -1)
1231: fatal("%s pledge(): %s", __func__, strerror(errno));
1232:
1233: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1234: debug("pledge: exec");
1235: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1236: NULL) == -1)
1237: fatal("%s pledge(): %s", __func__, strerror(errno));
1238:
1239: } else if (options.update_hostkeys) {
1240: debug("pledge: filesystem full");
1241: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1242: NULL) == -1)
1243: fatal("%s pledge(): %s", __func__, strerror(errno));
1244:
1.286 djm 1245: } else if (!option_clear_or_none(options.proxy_command) ||
1246: fork_after_authentication_flag) {
1.277 semarie 1247: debug("pledge: proc");
1248: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1249: fatal("%s pledge(): %s", __func__, strerror(errno));
1250:
1251: } else {
1252: debug("pledge: network");
1.300 mestre 1253: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.277 semarie 1254: fatal("%s pledge(): %s", __func__, strerror(errno));
1255: }
1.11 markus 1256:
1.307 dtucker 1257: start_time = monotime_double();
1.11 markus 1258:
1259: /* Initialize variables. */
1260: last_was_cr = 1;
1261: exit_status = -1;
1262: connection_in = packet_get_connection_in();
1263: connection_out = packet_get_connection_out();
1.287 deraadt 1264: max_fd = MAXIMUM(connection_in, connection_out);
1.46 markus 1265:
1.11 markus 1266: quit_pending = 0;
1267:
1.315 ! markus 1268: /* Initialize buffer. */
! 1269: if ((stderr_buffer = sshbuf_new()) == NULL)
! 1270: fatal("%s: sshbuf_new failed", __func__);
1.11 markus 1271:
1.15 markus 1272: client_init_dispatch();
1273:
1.105 markus 1274: /*
1275: * Set signal handlers, (e.g. to restore non-blocking mode)
1276: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1277: */
1.131 djm 1278: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1279: signal(SIGHUP, signal_handler);
1.105 markus 1280: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1281: signal(SIGINT, signal_handler);
1282: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1283: signal(SIGQUIT, signal_handler);
1284: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1285: signal(SIGTERM, signal_handler);
1.132 djm 1286: signal(SIGWINCH, window_change_handler);
1.11 markus 1287:
1288: if (have_pty)
1.233 djm 1289: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1290:
1.292 djm 1291: session_ident = ssh2_chan_id;
1292: if (session_ident != -1) {
1293: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1294: channel_register_filter(ssh, session_ident,
1.292 djm 1295: client_simple_escape_filter, NULL,
1296: client_filter_cleanup,
1297: client_new_escape_filter_ctx(
1298: escape_char_arg));
1.232 djm 1299: }
1.303 djm 1300: channel_register_cleanup(ssh, session_ident,
1.292 djm 1301: client_channel_closed, 0);
1.48 markus 1302: }
1.30 markus 1303:
1.11 markus 1304: /* Main loop of the client for the interactive session mode. */
1305: while (!quit_pending) {
1306:
1.13 markus 1307: /* Process buffered packets sent by the server. */
1.11 markus 1308: client_process_buffered_input_packets();
1309:
1.303 djm 1310: if (session_closed && !channel_still_open(ssh))
1.60 markus 1311: break;
1312:
1.303 djm 1313: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1314: debug("rekeying in progress");
1.284 djm 1315: } else if (need_rekeying) {
1316: /* manual rekey request */
1317: debug("need rekeying");
1.303 djm 1318: if ((r = kex_start_rekex(ssh)) != 0)
1.284 djm 1319: fatal("%s: kex_start_rekex: %s", __func__,
1320: ssh_err(r));
1321: need_rekeying = 0;
1.56 markus 1322: } else {
1323: /*
1324: * Make packets from buffered channel data, and
1325: * enqueue them for sending to the server.
1326: */
1327: if (packet_not_very_much_data_to_write())
1.303 djm 1328: channel_output_poll(ssh);
1.11 markus 1329:
1.56 markus 1330: /*
1331: * Check if the window size has changed, and buffer a
1332: * message about it to the server if so.
1333: */
1.303 djm 1334: client_check_window_change(ssh);
1.11 markus 1335:
1.56 markus 1336: if (quit_pending)
1337: break;
1338: }
1.13 markus 1339: /*
1340: * Wait until we have something to do (something becomes
1341: * available on one of the descriptors).
1342: */
1.81 markus 1343: max_fd2 = max_fd;
1.303 djm 1344: client_wait_until_can_do_something(ssh, &readset, &writeset,
1345: &max_fd2, &nalloc, ssh_packet_is_rekeying(ssh));
1.11 markus 1346:
1347: if (quit_pending)
1348: break;
1349:
1.56 markus 1350: /* Do channel operations unless rekeying in progress. */
1.303 djm 1351: if (!ssh_packet_is_rekeying(ssh))
1352: channel_after_select(ssh, readset, writeset);
1.11 markus 1353:
1.17 markus 1354: /* Buffer input from the connection. */
1.46 markus 1355: client_process_net_input(readset);
1.17 markus 1356:
1357: if (quit_pending)
1358: break;
1.11 markus 1359:
1.197 djm 1360: /*
1361: * Send as much buffered packet data as possible to the
1362: * sender.
1363: */
1.46 markus 1364: if (FD_ISSET(connection_out, writeset))
1.11 markus 1365: packet_write_poll();
1.222 djm 1366:
1367: /*
1368: * If we are a backgrounded control master, and the
1369: * timeout has expired without any active client
1370: * connections, then quit.
1371: */
1372: if (control_persist_exit_time > 0) {
1.251 dtucker 1373: if (monotime() >= control_persist_exit_time) {
1.222 djm 1374: debug("ControlPersist timeout expired");
1375: break;
1376: }
1377: }
1.11 markus 1378: }
1.250 djm 1379: free(readset);
1380: free(writeset);
1.11 markus 1381:
1382: /* Terminate the session. */
1383:
1384: /* Stop watching for window change. */
1.132 djm 1385: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1386:
1.292 djm 1387: packet_start(SSH2_MSG_DISCONNECT);
1388: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1389: packet_put_cstring("disconnected by user");
1390: packet_put_cstring(""); /* language tag */
1391: packet_send();
1392: packet_write_wait();
1.11 markus 1393:
1.303 djm 1394: channel_free_all(ssh);
1.11 markus 1395:
1.75 markus 1396: if (have_pty)
1.233 djm 1397: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1398:
1399: /* restore blocking io */
1400: if (!isatty(fileno(stdin)))
1401: unset_nonblock(fileno(stdin));
1402: if (!isatty(fileno(stdout)))
1403: unset_nonblock(fileno(stdout));
1404: if (!isatty(fileno(stderr)))
1405: unset_nonblock(fileno(stderr));
1.116 dtucker 1406:
1407: /*
1408: * If there was no shell or command requested, there will be no remote
1409: * exit status to be returned. In that case, clear error code if the
1410: * connection was deliberately terminated at this end.
1411: */
1412: if (no_shell_flag && received_signal == SIGTERM) {
1413: received_signal = 0;
1414: exit_status = 0;
1415: }
1.75 markus 1416:
1.301 dtucker 1417: if (received_signal) {
1418: verbose("Killed by signal %d.", (int) received_signal);
1419: cleanup_exit(0);
1420: }
1.75 markus 1421:
1.13 markus 1422: /*
1423: * In interactive mode (with pseudo tty) display a message indicating
1424: * that the connection has been closed.
1425: */
1.11 markus 1426: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.315 ! markus 1427: if ((r = sshbuf_putf(stderr_buffer,
! 1428: "Connection to %.64s closed.\r\n", host)) != 0)
! 1429: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.11 markus 1430: }
1.70 markus 1431:
1.11 markus 1432: /* Output any buffered data for stderr. */
1.315 ! markus 1433: if (sshbuf_len(stderr_buffer) > 0) {
1.230 djm 1434: len = atomicio(vwrite, fileno(stderr),
1.315 ! markus 1435: (u_char *)sshbuf_ptr(stderr_buffer),
! 1436: sshbuf_len(stderr_buffer));
! 1437: if (len < 0 || (u_int)len != sshbuf_len(stderr_buffer))
1.11 markus 1438: error("Write failed flushing stderr buffer.");
1.315 ! markus 1439: else if ((r = sshbuf_consume(stderr_buffer, len)) != 0)
! 1440: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.11 markus 1441: }
1442:
1443: /* Clear and free any buffers. */
1.281 jsg 1444: explicit_bzero(buf, sizeof(buf));
1.315 ! markus 1445: sshbuf_free(stderr_buffer);
1.11 markus 1446:
1447: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1448: total_time = monotime_double() - start_time;
1.263 markus 1449: packet_get_bytes(&ibytes, &obytes);
1.200 markus 1450: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1451: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1452: if (total_time > 0)
1.200 markus 1453: verbose("Bytes per second: sent %.1f, received %.1f",
1454: obytes / total_time, ibytes / total_time);
1.11 markus 1455: /* Return the exit status of the program. */
1456: debug("Exit status %d", exit_status);
1457: return exit_status;
1.15 markus 1458: }
1459:
1460: /*********/
1461:
1.77 itojun 1462: static Channel *
1.303 djm 1463: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1464: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1465: {
1.103 deraadt 1466: Channel *c = NULL;
1.289 markus 1467: struct sshbuf *b = NULL;
1.40 markus 1468: char *listen_address, *originator_address;
1.208 djm 1469: u_short listen_port, originator_port;
1.289 markus 1470: int r;
1.40 markus 1471:
1472: /* Get rest of the packet */
1473: listen_address = packet_get_string(NULL);
1474: listen_port = packet_get_int();
1475: originator_address = packet_get_string(NULL);
1476: originator_port = packet_get_int();
1.93 markus 1477: packet_check_eom();
1.40 markus 1478:
1.261 millert 1479: debug("%s: listen %s port %d, originator %s port %d", __func__,
1480: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1481:
1.303 djm 1482: c = channel_connect_by_listen_address(ssh, listen_address, listen_port,
1.191 djm 1483: "forwarded-tcpip", originator_address);
1.40 markus 1484:
1.289 markus 1485: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1486: if ((b = sshbuf_new()) == NULL) {
1487: error("%s: alloc reply", __func__);
1488: goto out;
1489: }
1490: /* reconstruct and send to muxclient */
1491: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1492: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1493: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1494: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1495: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1496: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1497: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1498: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1499: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1500: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1501: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.289 markus 1502: error("%s: compose for muxclient %s", __func__,
1503: ssh_err(r));
1504: goto out;
1505: }
1506: }
1507:
1508: out:
1509: sshbuf_free(b);
1.250 djm 1510: free(originator_address);
1511: free(listen_address);
1.40 markus 1512: return c;
1513: }
1514:
1.103 deraadt 1515: static Channel *
1.303 djm 1516: client_request_forwarded_streamlocal(struct ssh *ssh,
1517: const char *request_type, int rchan)
1.261 millert 1518: {
1519: Channel *c = NULL;
1520: char *listen_path;
1521:
1522: /* Get the remote path. */
1523: listen_path = packet_get_string(NULL);
1524: /* XXX: Skip reserved field for now. */
1525: if (packet_get_string_ptr(NULL) == NULL)
1526: fatal("%s: packet_get_string_ptr failed", __func__);
1527: packet_check_eom();
1528:
1529: debug("%s: %s", __func__, listen_path);
1530:
1.303 djm 1531: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1532: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1533: free(listen_path);
1534: return c;
1535: }
1536:
1537: static Channel *
1.303 djm 1538: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1539: {
1540: Channel *c = NULL;
1541: char *originator;
1.208 djm 1542: u_short originator_port;
1.67 markus 1543: int sock;
1.40 markus 1544:
1545: if (!options.forward_x11) {
1546: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1547: error("Warning: this is probably a break-in attempt by a "
1548: "malicious server.");
1.221 djm 1549: return NULL;
1550: }
1.274 djm 1551: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1552: verbose("Rejected X11 connection after ForwardX11Timeout "
1553: "expired");
1.40 markus 1554: return NULL;
1555: }
1556: originator = packet_get_string(NULL);
1.310 djm 1557: originator_port = packet_get_int();
1.93 markus 1558: packet_check_eom();
1.40 markus 1559: /* XXX check permission */
1.47 markus 1560: debug("client_request_x11: request from %s %d", originator,
1561: originator_port);
1.250 djm 1562: free(originator);
1.303 djm 1563: sock = x11_connect_display(ssh);
1.67 markus 1564: if (sock < 0)
1565: return NULL;
1.303 djm 1566: c = channel_new(ssh, "x11",
1.67 markus 1567: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1568: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1569: c->force_drain = 1;
1.40 markus 1570: return c;
1571: }
1572:
1.103 deraadt 1573: static Channel *
1.303 djm 1574: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1575: {
1576: Channel *c = NULL;
1.262 djm 1577: int r, sock;
1.40 markus 1578:
1579: if (!options.forward_agent) {
1580: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1581: error("Warning: this is probably a break-in attempt by a "
1582: "malicious server.");
1.40 markus 1583: return NULL;
1584: }
1.262 djm 1585: if ((r = ssh_get_authentication_socket(&sock)) != 0) {
1586: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1587: debug("%s: ssh_get_authentication_socket: %s",
1588: __func__, ssh_err(r));
1.67 markus 1589: return NULL;
1.262 djm 1590: }
1.303 djm 1591: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1592: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1593: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1594: "authentication agent connection", 1);
1.82 markus 1595: c->force_drain = 1;
1.40 markus 1596: return c;
1.180 djm 1597: }
1598:
1.306 djm 1599: char *
1.303 djm 1600: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1601: int local_tun, int remote_tun)
1.180 djm 1602: {
1603: Channel *c;
1604: int fd;
1.306 djm 1605: char *ifname = NULL;
1.180 djm 1606:
1607: if (tun_mode == SSH_TUNMODE_NO)
1608: return 0;
1609:
1610: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1611:
1612: /* Open local tunnel device */
1.306 djm 1613: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1614: error("Tunnel device open failed.");
1.306 djm 1615: return NULL;
1.180 djm 1616: }
1.306 djm 1617: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1618:
1.303 djm 1619: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1620: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1621: c->datagram = 1;
1622:
1623: packet_start(SSH2_MSG_CHANNEL_OPEN);
1624: packet_put_cstring("tun@openssh.com");
1625: packet_put_int(c->self);
1626: packet_put_int(c->local_window_max);
1627: packet_put_int(c->local_maxpacket);
1628: packet_put_int(tun_mode);
1629: packet_put_int(remote_tun);
1630: packet_send();
1631:
1.306 djm 1632: return ifname;
1.40 markus 1633: }
1634:
1.22 markus 1635: /* XXXX move to generic input handler */
1.264 markus 1636: static int
1.297 markus 1637: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1638: {
1639: Channel *c = NULL;
1640: char *ctype;
1641: int rchan;
1.102 markus 1642: u_int rmaxpack, rwindow, len;
1.22 markus 1643:
1644: ctype = packet_get_string(&len);
1645: rchan = packet_get_int();
1646: rwindow = packet_get_int();
1647: rmaxpack = packet_get_int();
1648:
1.24 markus 1649: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1650: ctype, rchan, rwindow, rmaxpack);
1651:
1.40 markus 1652: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1653: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1654: rmaxpack);
1.261 millert 1655: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1656: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1657: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1658: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1659: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1660: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1661: }
1.289 markus 1662: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1663: debug3("proxied to downstream: %s", ctype);
1664: } else if (c != NULL) {
1.22 markus 1665: debug("confirm %s", ctype);
1666: c->remote_id = rchan;
1.304 djm 1667: c->have_remote_id = 1;
1.22 markus 1668: c->remote_window = rwindow;
1669: c->remote_maxpacket = rmaxpack;
1.69 markus 1670: if (c->type != SSH_CHANNEL_CONNECTING) {
1671: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1672: packet_put_int(c->remote_id);
1673: packet_put_int(c->self);
1674: packet_put_int(c->local_window);
1675: packet_put_int(c->local_maxpacket);
1676: packet_send();
1677: }
1.22 markus 1678: } else {
1679: debug("failure %s", ctype);
1680: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1681: packet_put_int(rchan);
1682: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.310 djm 1683: packet_put_cstring("open failed");
1684: packet_put_cstring("");
1.22 markus 1685: packet_send();
1686: }
1.250 djm 1687: free(ctype);
1.264 markus 1688: return 0;
1.22 markus 1689: }
1.267 djm 1690:
1.264 markus 1691: static int
1.297 markus 1692: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1693: {
1694: Channel *c = NULL;
1.123 djm 1695: int exitval, id, reply, success = 0;
1.48 markus 1696: char *rtype;
1697:
1698: id = packet_get_int();
1.303 djm 1699: c = channel_lookup(ssh, id);
1.297 markus 1700: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1701: return 0;
1.48 markus 1702: rtype = packet_get_string(NULL);
1703: reply = packet_get_char();
1704:
1705: debug("client_input_channel_req: channel %d rtype %s reply %d",
1706: id, rtype, reply);
1707:
1.128 djm 1708: if (id == -1) {
1709: error("client_input_channel_req: request for channel -1");
1.289 markus 1710: } else if (c == NULL) {
1.197 djm 1711: error("client_input_channel_req: channel %d: "
1712: "unknown channel", id);
1.193 markus 1713: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1714: packet_check_eom();
1.303 djm 1715: chan_rcvd_eow(ssh, c);
1.48 markus 1716: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1717: exitval = packet_get_int();
1.217 djm 1718: if (c->ctl_chan != -1) {
1.303 djm 1719: mux_exit_message(ssh, c, exitval);
1.215 djm 1720: success = 1;
1721: } else if (id == session_ident) {
1722: /* Record exit value of local session */
1.123 djm 1723: success = 1;
1724: exit_status = exitval;
1.215 djm 1725: } else {
1.218 djm 1726: /* Probably for a mux channel that has already closed */
1727: debug("%s: no sink for exit-status on channel %d",
1728: __func__, id);
1.123 djm 1729: }
1.93 markus 1730: packet_check_eom();
1.48 markus 1731: }
1.259 djm 1732: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1733: if (!c->have_remote_id)
1734: fatal("%s: channel %d: no remote_id",
1735: __func__, c->self);
1.48 markus 1736: packet_start(success ?
1737: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 1738: packet_put_int(c->remote_id);
1.48 markus 1739: packet_send();
1740: }
1.250 djm 1741: free(rtype);
1.264 markus 1742: return 0;
1.48 markus 1743: }
1.267 djm 1744:
1.269 djm 1745: struct hostkeys_update_ctx {
1746: /* The hostname and (optionally) IP address string for the server */
1747: char *host_str, *ip_str;
1748:
1749: /*
1750: * Keys received from the server and a flag for each indicating
1751: * whether they already exist in known_hosts.
1752: * keys_seen is filled in by hostkeys_find() and later (for new
1753: * keys) by client_global_hostkeys_private_confirm().
1754: */
1755: struct sshkey **keys;
1756: int *keys_seen;
1.314 djm 1757: size_t nkeys, nnew;
1.269 djm 1758:
1759: /*
1760: * Keys that are in known_hosts, but were not present in the update
1761: * from the server (i.e. scheduled to be deleted).
1762: * Filled in by hostkeys_find().
1763: */
1764: struct sshkey **old_keys;
1765: size_t nold;
1766: };
1767:
1768: static void
1769: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1770: {
1771: size_t i;
1772:
1773: if (ctx == NULL)
1774: return;
1775: for (i = 0; i < ctx->nkeys; i++)
1776: sshkey_free(ctx->keys[i]);
1777: free(ctx->keys);
1778: free(ctx->keys_seen);
1779: for (i = 0; i < ctx->nold; i++)
1780: sshkey_free(ctx->old_keys[i]);
1781: free(ctx->old_keys);
1782: free(ctx->host_str);
1783: free(ctx->ip_str);
1784: free(ctx);
1785: }
1786:
1787: static int
1788: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1789: {
1790: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1791: size_t i;
1792: struct sshkey **tmp;
1793:
1.293 djm 1794: if (l->status != HKF_STATUS_MATCHED || l->key == NULL)
1.269 djm 1795: return 0;
1796:
1797: /* Mark off keys we've already seen for this host */
1798: for (i = 0; i < ctx->nkeys; i++) {
1799: if (sshkey_equal(l->key, ctx->keys[i])) {
1800: debug3("%s: found %s key at %s:%ld", __func__,
1801: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1802: ctx->keys_seen[i] = 1;
1803: return 0;
1804: }
1805: }
1806: /* This line contained a key that not offered by the server */
1807: debug3("%s: deprecated %s key at %s:%ld", __func__,
1808: sshkey_ssh_name(l->key), l->path, l->linenum);
1.299 deraadt 1809: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1810: sizeof(*ctx->old_keys))) == NULL)
1.299 deraadt 1811: fatal("%s: recallocarray failed nold = %zu",
1.269 djm 1812: __func__, ctx->nold);
1813: ctx->old_keys = tmp;
1814: ctx->old_keys[ctx->nold++] = l->key;
1815: l->key = NULL;
1816:
1817: return 0;
1818: }
1819:
1820: static void
1821: update_known_hosts(struct hostkeys_update_ctx *ctx)
1822: {
1.271 djm 1823: int r, was_raw = 0;
1824: int loglevel = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK ?
1.269 djm 1825: SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1826: char *fp, *response;
1827: size_t i;
1828:
1829: for (i = 0; i < ctx->nkeys; i++) {
1830: if (ctx->keys_seen[i] != 2)
1831: continue;
1832: if ((fp = sshkey_fingerprint(ctx->keys[i],
1833: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1834: fatal("%s: sshkey_fingerprint failed", __func__);
1835: do_log2(loglevel, "Learned new hostkey: %s %s",
1836: sshkey_type(ctx->keys[i]), fp);
1837: free(fp);
1838: }
1839: for (i = 0; i < ctx->nold; i++) {
1840: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
1841: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1842: fatal("%s: sshkey_fingerprint failed", __func__);
1843: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
1844: sshkey_type(ctx->old_keys[i]), fp);
1845: free(fp);
1846: }
1847: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 1848: if (get_saved_tio() != NULL) {
1849: leave_raw_mode(1);
1850: was_raw = 1;
1851: }
1.269 djm 1852: response = NULL;
1853: for (i = 0; !quit_pending && i < 3; i++) {
1854: free(response);
1855: response = read_passphrase("Accept updated hostkeys? "
1856: "(yes/no): ", RP_ECHO);
1857: if (strcasecmp(response, "yes") == 0)
1858: break;
1859: else if (quit_pending || response == NULL ||
1860: strcasecmp(response, "no") == 0) {
1861: options.update_hostkeys = 0;
1862: break;
1863: } else {
1864: do_log2(loglevel, "Please enter "
1865: "\"yes\" or \"no\"");
1866: }
1867: }
1868: if (quit_pending || i >= 3 || response == NULL)
1869: options.update_hostkeys = 0;
1870: free(response);
1.271 djm 1871: if (was_raw)
1872: enter_raw_mode(1);
1.269 djm 1873: }
1874:
1875: /*
1876: * Now that all the keys are verified, we can go ahead and replace
1877: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
1878: * cancel the operation).
1879: */
1880: if (options.update_hostkeys != 0 &&
1881: (r = hostfile_replace_entries(options.user_hostfiles[0],
1882: ctx->host_str, ctx->ip_str, ctx->keys, ctx->nkeys,
1883: options.hash_known_hosts, 0,
1884: options.fingerprint_hash)) != 0)
1885: error("%s: hostfile_replace_entries failed: %s",
1886: __func__, ssh_err(r));
1887: }
1888:
1889: static void
1.303 djm 1890: client_global_hostkeys_private_confirm(struct ssh *ssh, int type,
1891: u_int32_t seq, void *_ctx)
1.269 djm 1892: {
1893: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1894: size_t i, ndone;
1895: struct sshbuf *signdata;
1.309 djm 1896: int r, kexsigtype, use_kexsigtype;
1.269 djm 1897: const u_char *sig;
1898: size_t siglen;
1899:
1900: if (ctx->nnew == 0)
1901: fatal("%s: ctx->nnew == 0", __func__); /* sanity */
1902: if (type != SSH2_MSG_REQUEST_SUCCESS) {
1903: error("Server failed to confirm ownership of "
1904: "private host keys");
1905: hostkeys_update_ctx_free(ctx);
1906: return;
1907: }
1.309 djm 1908: kexsigtype = sshkey_type_plain(
1909: sshkey_type_from_name(ssh->kex->hostkey_alg));
1910:
1.269 djm 1911: if ((signdata = sshbuf_new()) == NULL)
1912: fatal("%s: sshbuf_new failed", __func__);
1913: /* Don't want to accidentally accept an unbound signature */
1914: if (ssh->kex->session_id_len == 0)
1915: fatal("%s: ssh->kex->session_id_len == 0", __func__);
1916: /*
1917: * Expect a signature for each of the ctx->nnew private keys we
1918: * haven't seen before. They will be in the same order as the
1919: * ctx->keys where the corresponding ctx->keys_seen[i] == 0.
1920: */
1921: for (ndone = i = 0; i < ctx->nkeys; i++) {
1922: if (ctx->keys_seen[i])
1923: continue;
1924: /* Prepare data to be signed: session ID, unique string, key */
1925: sshbuf_reset(signdata);
1.270 djm 1926: if ( (r = sshbuf_put_cstring(signdata,
1927: "hostkeys-prove-00@openssh.com")) != 0 ||
1928: (r = sshbuf_put_string(signdata, ssh->kex->session_id,
1.269 djm 1929: ssh->kex->session_id_len)) != 0 ||
1930: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1931: fatal("%s: failed to prepare signature: %s",
1932: __func__, ssh_err(r));
1933: /* Extract and verify signature */
1934: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1935: error("%s: couldn't parse message: %s",
1936: __func__, ssh_err(r));
1937: goto out;
1938: }
1.309 djm 1939: /*
1940: * For RSA keys, prefer to use the signature type negotiated
1941: * during KEX to the default (SHA1).
1942: */
1943: use_kexsigtype = kexsigtype == KEY_RSA &&
1944: sshkey_type_plain(ctx->keys[i]->type) == KEY_RSA;
1.269 djm 1945: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 1946: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.309 djm 1947: use_kexsigtype ? ssh->kex->hostkey_alg : NULL, 0)) != 0) {
1.269 djm 1948: error("%s: server gave bad signature for %s key %zu",
1949: __func__, sshkey_type(ctx->keys[i]), i);
1950: goto out;
1951: }
1952: /* Key is good. Mark it as 'seen' */
1953: ctx->keys_seen[i] = 2;
1954: ndone++;
1955: }
1956: if (ndone != ctx->nnew)
1957: fatal("%s: ndone != ctx->nnew (%zu / %zu)", __func__,
1958: ndone, ctx->nnew); /* Shouldn't happen */
1959: ssh_packet_check_eom(ssh);
1960:
1961: /* Make the edits to known_hosts */
1962: update_known_hosts(ctx);
1963: out:
1964: hostkeys_update_ctx_free(ctx);
1965: }
1966:
1.267 djm 1967: /*
1.291 djm 1968: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
1969: * Made slightly less trivial by the multiple RSA signature algorithm names.
1970: */
1971: static int
1972: key_accepted_by_hostkeyalgs(const struct sshkey *key)
1973: {
1974: const char *ktype = sshkey_ssh_name(key);
1975: const char *hostkeyalgs = options.hostkeyalgorithms != NULL ?
1976: options.hostkeyalgorithms : KEX_DEFAULT_PK_ALG;
1977:
1978: if (key == NULL || key->type == KEY_UNSPEC)
1979: return 0;
1980: if (key->type == KEY_RSA &&
1981: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
1982: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
1983: return 1;
1984: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
1985: }
1986:
1987: /*
1.270 djm 1988: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 1989: * the server's hostkeys. The keys are checked against the user's
1990: * HostkeyAlgorithms preference before they are accepted.
1991: */
1992: static int
1993: client_input_hostkeys(void)
1994: {
1.269 djm 1995: struct ssh *ssh = active_state; /* XXX */
1.267 djm 1996: const u_char *blob = NULL;
1.269 djm 1997: size_t i, len = 0;
1.267 djm 1998: struct sshbuf *buf = NULL;
1.269 djm 1999: struct sshkey *key = NULL, **tmp;
2000: int r;
2001: char *fp;
1.267 djm 2002: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2003: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2004: struct hostkeys_update_ctx *ctx = NULL;
1.267 djm 2005:
2006: if (hostkeys_seen)
2007: fatal("%s: server already sent hostkeys", __func__);
1.269 djm 2008: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2009: options.batch_mode)
2010: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2011: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2012: return 1;
1.272 djm 2013:
2014: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2015: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2016: sshkey_free(key);
2017: key = NULL;
1.269 djm 2018: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
2019: error("%s: couldn't parse message: %s",
2020: __func__, ssh_err(r));
2021: goto out;
2022: }
1.270 djm 2023: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
2024: error("%s: parse key: %s", __func__, ssh_err(r));
2025: goto out;
2026: }
1.267 djm 2027: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2028: SSH_FP_DEFAULT);
2029: debug3("%s: received %s key %s", __func__,
2030: sshkey_type(key), fp);
2031: free(fp);
1.275 markus 2032:
1.291 djm 2033: if (!key_accepted_by_hostkeyalgs(key)) {
1.267 djm 2034: debug3("%s: %s key not permitted by HostkeyAlgorithms",
2035: __func__, sshkey_ssh_name(key));
2036: continue;
2037: }
1.269 djm 2038: /* Skip certs */
2039: if (sshkey_is_cert(key)) {
2040: debug3("%s: %s key is a certificate; skipping",
2041: __func__, sshkey_ssh_name(key));
2042: continue;
2043: }
2044: /* Ensure keys are unique */
2045: for (i = 0; i < ctx->nkeys; i++) {
2046: if (sshkey_equal(key, ctx->keys[i])) {
2047: error("%s: received duplicated %s host key",
2048: __func__, sshkey_ssh_name(key));
2049: goto out;
2050: }
2051: }
2052: /* Key is good, record it */
1.299 deraadt 2053: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2054: sizeof(*ctx->keys))) == NULL)
1.299 deraadt 2055: fatal("%s: recallocarray failed nkeys = %zu",
1.269 djm 2056: __func__, ctx->nkeys);
2057: ctx->keys = tmp;
2058: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2059: key = NULL;
2060: }
2061:
1.269 djm 2062: if (ctx->nkeys == 0) {
1.270 djm 2063: debug("%s: server sent no hostkeys", __func__);
1.267 djm 2064: goto out;
2065: }
1.270 djm 2066:
1.269 djm 2067: if ((ctx->keys_seen = calloc(ctx->nkeys,
2068: sizeof(*ctx->keys_seen))) == NULL)
2069: fatal("%s: calloc failed", __func__);
1.267 djm 2070:
1.268 djm 2071: get_hostfile_hostname_ipaddr(host,
2072: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2073: options.port, &ctx->host_str,
2074: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2075:
1.269 djm 2076: /* Find which keys we already know about. */
2077: if ((r = hostkeys_foreach(options.user_hostfiles[0], hostkeys_find,
2078: ctx, ctx->host_str, ctx->ip_str,
2079: HKF_WANT_PARSE_KEY|HKF_WANT_MATCH)) != 0) {
2080: error("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1.267 djm 2081: goto out;
2082: }
2083:
1.269 djm 2084: /* Figure out if we have any new keys to add */
2085: ctx->nnew = 0;
2086: for (i = 0; i < ctx->nkeys; i++) {
2087: if (!ctx->keys_seen[i])
2088: ctx->nnew++;
2089: }
2090:
2091: debug3("%s: %zu keys from server: %zu new, %zu retained. %zu to remove",
2092: __func__, ctx->nkeys, ctx->nnew, ctx->nkeys - ctx->nnew, ctx->nold);
2093:
2094: if (ctx->nnew == 0 && ctx->nold != 0) {
2095: /* We have some keys to remove. Just do it. */
2096: update_known_hosts(ctx);
2097: } else if (ctx->nnew != 0) {
2098: /*
2099: * We have received hitherto-unseen keys from the server.
2100: * Ask the server to confirm ownership of the private halves.
2101: */
2102: debug3("%s: asking server to prove ownership for %zu keys",
2103: __func__, ctx->nnew);
2104: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2105: (r = sshpkt_put_cstring(ssh,
1.270 djm 2106: "hostkeys-prove-00@openssh.com")) != 0 ||
1.269 djm 2107: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
2108: fatal("%s: cannot prepare packet: %s",
2109: __func__, ssh_err(r));
2110: if ((buf = sshbuf_new()) == NULL)
2111: fatal("%s: sshbuf_new", __func__);
2112: for (i = 0; i < ctx->nkeys; i++) {
2113: if (ctx->keys_seen[i])
2114: continue;
2115: sshbuf_reset(buf);
2116: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0)
2117: fatal("%s: sshkey_putb: %s",
2118: __func__, ssh_err(r));
2119: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
2120: fatal("%s: sshpkt_put_string: %s",
2121: __func__, ssh_err(r));
2122: }
2123: if ((r = sshpkt_send(ssh)) != 0)
2124: fatal("%s: sshpkt_send: %s", __func__, ssh_err(r));
2125: client_register_global_confirm(
2126: client_global_hostkeys_private_confirm, ctx);
2127: ctx = NULL; /* will be freed in callback */
2128: }
2129:
1.267 djm 2130: /* Success */
2131: out:
1.269 djm 2132: hostkeys_update_ctx_free(ctx);
1.267 djm 2133: sshkey_free(key);
2134: sshbuf_free(buf);
1.269 djm 2135: /*
2136: * NB. Return success for all cases. The server doesn't need to know
2137: * what the client does with its hosts file.
2138: */
2139: return 1;
1.267 djm 2140: }
2141:
1.264 markus 2142: static int
1.297 markus 2143: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2144: {
2145: char *rtype;
2146: int want_reply;
2147: int success = 0;
2148:
1.267 djm 2149: rtype = packet_get_cstring(NULL);
1.95 markus 2150: want_reply = packet_get_char();
1.117 markus 2151: debug("client_input_global_request: rtype %s want_reply %d",
2152: rtype, want_reply);
1.270 djm 2153: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.267 djm 2154: success = client_input_hostkeys();
1.95 markus 2155: if (want_reply) {
2156: packet_start(success ?
2157: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
2158: packet_send();
2159: packet_write_wait();
2160: }
1.250 djm 2161: free(rtype);
1.264 markus 2162: return 0;
1.95 markus 2163: }
1.22 markus 2164:
1.123 djm 2165: void
1.303 djm 2166: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.315 ! markus 2167: const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd,
! 2168: char **env)
1.123 djm 2169: {
1.313 djm 2170: int i, j, matched, len;
2171: char *name, *val;
1.132 djm 2172: Channel *c = NULL;
1.123 djm 2173:
2174: debug2("%s: id %d", __func__, id);
2175:
1.303 djm 2176: if ((c = channel_lookup(ssh, id)) == NULL)
2177: fatal("%s: channel %d: unknown channel", __func__, id);
1.224 djm 2178:
2179: packet_set_interactive(want_tty,
2180: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2181:
1.123 djm 2182: if (want_tty) {
2183: struct winsize ws;
2184:
2185: /* Store window size in the packet. */
2186: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2187: memset(&ws, 0, sizeof(ws));
2188:
1.303 djm 2189: channel_request_start(ssh, id, "pty-req", 1);
2190: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.123 djm 2191: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 2192: packet_put_int((u_int)ws.ws_col);
2193: packet_put_int((u_int)ws.ws_row);
2194: packet_put_int((u_int)ws.ws_xpixel);
2195: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 2196: if (tiop == NULL)
2197: tiop = get_saved_tio();
2198: tty_make_modes(-1, tiop);
1.123 djm 2199: packet_send();
2200: /* XXX wait for reply */
1.132 djm 2201: c->client_tty = 1;
1.123 djm 2202: }
2203:
2204: /* Transfer any environment variables from client to server */
1.126 djm 2205: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2206: debug("Sending environment.");
1.126 djm 2207: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2208: /* Split */
1.126 djm 2209: name = xstrdup(env[i]);
1.123 djm 2210: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2211: free(name);
1.123 djm 2212: continue;
2213: }
2214: *val++ = '\0';
2215:
2216: matched = 0;
2217: for (j = 0; j < options.num_send_env; j++) {
2218: if (match_pattern(name, options.send_env[j])) {
2219: matched = 1;
2220: break;
2221: }
2222: }
2223: if (!matched) {
2224: debug3("Ignored env %s", name);
1.250 djm 2225: free(name);
1.123 djm 2226: continue;
2227: }
2228:
2229: debug("Sending env %s = %s", name, val);
1.303 djm 2230: channel_request_start(ssh, id, "env", 0);
1.123 djm 2231: packet_put_cstring(name);
2232: packet_put_cstring(val);
2233: packet_send();
1.250 djm 2234: free(name);
1.123 djm 2235: }
1.313 djm 2236: }
2237: for (i = 0; i < options.num_setenv; i++) {
2238: /* Split */
2239: name = xstrdup(options.setenv[i]);
2240: if ((val = strchr(name, '=')) == NULL) {
2241: free(name);
2242: continue;
2243: }
2244: *val++ = '\0';
2245:
2246: debug("Setting env %s = %s", name, val);
2247: channel_request_start(ssh, id, "env", 0);
2248: packet_put_cstring(name);
2249: packet_put_cstring(val);
2250: packet_send();
2251: free(name);
1.123 djm 2252: }
2253:
1.315 ! markus 2254: len = sshbuf_len(cmd);
1.123 djm 2255: if (len > 0) {
2256: if (len > 900)
2257: len = 900;
2258: if (want_subsystem) {
1.190 djm 2259: debug("Sending subsystem: %.*s",
1.315 ! markus 2260: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2261: channel_request_start(ssh, id, "subsystem", 1);
2262: client_expect_confirm(ssh, id, "subsystem",
2263: CONFIRM_CLOSE);
1.123 djm 2264: } else {
1.190 djm 2265: debug("Sending command: %.*s",
1.315 ! markus 2266: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2267: channel_request_start(ssh, id, "exec", 1);
2268: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2269: }
1.315 ! markus 2270: packet_put_string(sshbuf_ptr(cmd), sshbuf_len(cmd));
1.123 djm 2271: packet_send();
2272: } else {
1.303 djm 2273: channel_request_start(ssh, id, "shell", 1);
2274: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.123 djm 2275: packet_send();
2276: }
2277: }
2278:
1.77 itojun 2279: static void
1.292 djm 2280: client_init_dispatch(void)
1.16 markus 2281: {
1.55 markus 2282: dispatch_init(&dispatch_protocol_error);
1.100 markus 2283:
1.16 markus 2284: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2285: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2286: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2287: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2288: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2289: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2290: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2291: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2292: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2293: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2294: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2295: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2296:
2297: /* rekeying */
2298: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2299:
2300: /* global request reply messages */
2301: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2302: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2303: }
2304:
2305: void
2306: client_stop_mux(void)
2307: {
2308: if (options.control_path != NULL && muxserver_sock != -1)
2309: unlink(options.control_path);
2310: /*
1.247 dtucker 2311: * If we are in persist mode, or don't have a shell, signal that we
2312: * should close when all active channels are closed.
1.232 djm 2313: */
1.247 dtucker 2314: if (options.control_persist || no_shell_flag) {
1.232 djm 2315: session_closed = 1;
1.235 djm 2316: setproctitle("[stopped mux]");
2317: }
1.113 markus 2318: }
2319:
2320: /* client specific fatal cleanup */
2321: void
1.114 markus 2322: cleanup_exit(int i)
1.113 markus 2323: {
1.233 djm 2324: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2325: leave_non_blocking();
1.192 djm 2326: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2327: unlink(options.control_path);
1.223 djm 2328: ssh_kill_proxy_command();
1.114 markus 2329: _exit(i);
1.1 deraadt 2330: }
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