Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.325
1.325 ! dtucker 1: /* $OpenBSD: clientloop.c,v 1.324 2019/06/12 11:31:50 jmc 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"
1.317 markus 90: #include "sshkey.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"
1.319 djm 106:
1.39 markus 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
1.324 jmc 124: * command line, or the Hostname specified for the user-supplied name in a
1.13 markus 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:
1.321 djm 155: static void client_init_dispatch(struct ssh *ssh);
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: {
1.318 djm 274: char *cmd, line[512], xdisplay[512];
1.279 djm 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: rmdir(xauthdir);
334: return -1;
335: }
336:
1.318 djm 337: if (timeout == 0) {
338: /* auth doesn't time out */
339: xasprintf(&cmd, "%s -f %s generate %s %s "
340: "untrusted 2>%s",
341: xauth_path, xauthfile, display,
342: SSH_X11_PROTO, _PATH_DEVNULL);
343: } else {
344: /* Add some slack to requested expiry */
345: if (timeout < UINT_MAX - X11_TIMEOUT_SLACK)
346: x11_timeout_real = timeout +
347: X11_TIMEOUT_SLACK;
348: else {
349: /* Don't overflow on long timeouts */
350: x11_timeout_real = UINT_MAX;
351: }
352: xasprintf(&cmd, "%s -f %s generate %s %s "
353: "untrusted timeout %u 2>%s",
354: xauth_path, xauthfile, display,
355: SSH_X11_PROTO, x11_timeout_real,
356: _PATH_DEVNULL);
357: }
1.322 djm 358: debug2("%s: xauth command: %s", __func__, cmd);
1.318 djm 359:
360: if (timeout != 0 && x11_refuse_time == 0) {
1.279 djm 361: now = monotime() + 1;
362: if (UINT_MAX - timeout < now)
363: x11_refuse_time = UINT_MAX;
364: else
365: x11_refuse_time = now + timeout;
1.303 djm 366: channel_set_x11_refuse_time(ssh,
367: x11_refuse_time);
1.138 djm 368: }
1.279 djm 369: if (system(cmd) == 0)
370: generated = 1;
1.318 djm 371: free(cmd);
1.138 djm 372: }
1.181 markus 373:
374: /*
375: * When in untrusted mode, we read the cookie only if it was
376: * successfully generated as an untrusted one in the step
377: * above.
378: */
379: if (trusted || generated) {
1.318 djm 380: xasprintf(&cmd,
1.181 markus 381: "%s %s%s list %s 2>" _PATH_DEVNULL,
382: xauth_path,
383: generated ? "-f " : "" ,
384: generated ? xauthfile : "",
385: display);
386: debug2("x11_get_proto: %s", cmd);
387: f = popen(cmd, "r");
388: if (f && fgets(line, sizeof(line), f) &&
389: sscanf(line, "%*s %511s %511s", proto, data) == 2)
390: got_data = 1;
391: if (f)
392: pclose(f);
1.318 djm 393: free(cmd);
1.279 djm 394: }
1.138 djm 395: }
396:
397: if (do_unlink) {
398: unlink(xauthfile);
399: rmdir(xauthdir);
400: }
401:
1.279 djm 402: /* Don't fall back to fake X11 data for untrusted forwarding */
403: if (!trusted && !got_data) {
404: error("Warning: untrusted X11 forwarding setup failed: "
405: "xauth key data not generated");
406: return -1;
407: }
408:
1.138 djm 409: /*
410: * If we didn't get authentication data, just make up some
411: * data. The forwarding code will check the validity of the
412: * response anyway, and substitute this data. The X11
413: * server, however, will ignore this fake data and use
414: * whatever authentication mechanisms it was using otherwise
415: * for the local connection.
416: */
417: if (!got_data) {
1.288 tedu 418: u_int8_t rnd[16];
419: u_int i;
1.138 djm 420:
421: logit("Warning: No xauth data; "
422: "using fake authentication data for X11 forwarding.");
423: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.288 tedu 424: arc4random_buf(rnd, sizeof(rnd));
425: for (i = 0; i < sizeof(rnd); i++) {
1.138 djm 426: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.288 tedu 427: rnd[i]);
1.138 djm 428: }
429: }
1.279 djm 430:
431: return 0;
1.1 deraadt 432: }
433:
1.13 markus 434: /*
435: * Checks if the client window has changed, and sends a packet about it to
436: * the server if so. The actual change is detected elsewhere (by a software
437: * interrupt on Unix); this just checks the flag and sends a message if
438: * appropriate.
439: */
1.1 deraadt 440:
1.77 itojun 441: static void
1.303 djm 442: client_check_window_change(struct ssh *ssh)
1.1 deraadt 443: {
1.292 djm 444: if (!received_window_change_signal)
1.16 markus 445: return;
446: /** XXX race */
447: received_window_change_signal = 0;
448:
1.292 djm 449: debug2("%s: changed", __func__);
1.16 markus 450:
1.303 djm 451: channel_send_window_changes(ssh);
1.1 deraadt 452: }
453:
1.264 markus 454: static int
1.297 markus 455: client_global_request_reply(int type, u_int32_t seq, struct ssh *ssh)
1.117 markus 456: {
1.196 djm 457: struct global_confirm *gc;
458:
459: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 460: return 0;
1.196 djm 461: if (gc->cb != NULL)
1.303 djm 462: gc->cb(ssh, type, seq, gc->ctx);
1.196 djm 463: if (--gc->ref_count <= 0) {
464: TAILQ_REMOVE(&global_confirms, gc, entry);
1.257 tedu 465: explicit_bzero(gc, sizeof(*gc));
1.250 djm 466: free(gc);
1.196 djm 467: }
468:
1.320 djm 469: ssh_packet_set_alive_timeouts(ssh, 0);
1.264 markus 470: return 0;
1.117 markus 471: }
472:
473: static void
1.320 djm 474: server_alive_check(struct ssh *ssh)
1.117 markus 475: {
1.320 djm 476: int r;
477:
478: if (ssh_packet_inc_alive_timeouts(ssh) > options.server_alive_count_max) {
1.228 djm 479: logit("Timeout, server %s not responding.", host);
1.176 markus 480: cleanup_exit(255);
481: }
1.320 djm 482: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
483: (r = sshpkt_put_cstring(ssh, "keepalive@openssh.com")) != 0 ||
484: (r = sshpkt_put_u8(ssh, 1)) != 0 || /* boolean: want reply */
485: (r = sshpkt_send(ssh)) != 0)
1.322 djm 486: fatal("%s: send packet: %s", __func__, ssh_err(r));
1.196 djm 487: /* Insert an empty placeholder to maintain ordering */
488: client_register_global_confirm(NULL, NULL);
1.117 markus 489: }
490:
1.13 markus 491: /*
492: * Waits until the client can do something (some data becomes available on
493: * one of the file descriptors).
494: */
1.77 itojun 495: static void
1.303 djm 496: client_wait_until_can_do_something(struct ssh *ssh,
497: fd_set **readsetp, fd_set **writesetp,
1.130 avsm 498: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 499: {
1.117 markus 500: struct timeval tv, *tvp;
1.222 djm 501: int timeout_secs;
1.251 dtucker 502: time_t minwait_secs = 0, server_alive_time = 0, now = monotime();
1.315 markus 503: int r, ret;
1.117 markus 504:
1.46 markus 505: /* Add any selections by the channel mechanism. */
1.321 djm 506: channel_prepare_select(ssh, readsetp, writesetp, maxfdp,
1.302 djm 507: nallocp, &minwait_secs);
1.11 markus 508:
1.292 djm 509: /* channel_prepare_select could have closed the last channel */
1.303 djm 510: if (session_closed && !channel_still_open(ssh) &&
1.320 djm 511: !ssh_packet_have_data_to_write(ssh)) {
1.292 djm 512: /* clear mask since we did not call select() */
513: memset(*readsetp, 0, *nallocp);
514: memset(*writesetp, 0, *nallocp);
515: return;
1.16 markus 516: }
1.11 markus 517:
1.294 djm 518: FD_SET(connection_in, *readsetp);
519:
1.11 markus 520: /* Select server connection if have data to write to the server. */
1.320 djm 521: if (ssh_packet_have_data_to_write(ssh))
1.46 markus 522: FD_SET(connection_out, *writesetp);
1.11 markus 523:
1.13 markus 524: /*
525: * Wait for something to happen. This will suspend the process until
526: * some selected descriptor can be read, written, or has some other
1.222 djm 527: * event pending, or a timeout expires.
1.13 markus 528: */
1.11 markus 529:
1.222 djm 530: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.292 djm 531: if (options.server_alive_interval > 0) {
1.222 djm 532: timeout_secs = options.server_alive_interval;
1.249 dtucker 533: server_alive_time = now + options.server_alive_interval;
534: }
1.292 djm 535: if (options.rekey_interval > 0 && !rekeying)
1.320 djm 536: timeout_secs = MINIMUM(timeout_secs,
537: ssh_packet_get_rekey_timeout(ssh));
1.303 djm 538: set_control_persist_exit_time(ssh);
1.222 djm 539: if (control_persist_exit_time > 0) {
1.287 deraadt 540: timeout_secs = MINIMUM(timeout_secs,
1.249 dtucker 541: control_persist_exit_time - now);
1.222 djm 542: if (timeout_secs < 0)
543: timeout_secs = 0;
544: }
1.239 djm 545: if (minwait_secs != 0)
1.287 deraadt 546: timeout_secs = MINIMUM(timeout_secs, (int)minwait_secs);
1.222 djm 547: if (timeout_secs == INT_MAX)
1.117 markus 548: tvp = NULL;
1.129 deraadt 549: else {
1.222 djm 550: tv.tv_sec = timeout_secs;
1.117 markus 551: tv.tv_usec = 0;
552: tvp = &tv;
553: }
1.222 djm 554:
1.117 markus 555: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
556: if (ret < 0) {
1.51 markus 557: /*
558: * We have to clear the select masks, because we return.
559: * We have to return, because the mainloop checks for the flags
560: * set by the signal handlers.
561: */
1.87 markus 562: memset(*readsetp, 0, *nallocp);
563: memset(*writesetp, 0, *nallocp);
1.50 deraadt 564:
1.11 markus 565: if (errno == EINTR)
566: return;
567: /* Note: we might still have data in the buffers. */
1.315 markus 568: if ((r = sshbuf_putf(stderr_buffer,
569: "select: %s\r\n", strerror(errno))) != 0)
570: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.11 markus 571: quit_pending = 1;
1.249 dtucker 572: } else if (ret == 0) {
573: /*
574: * Timeout. Could have been either keepalive or rekeying.
575: * Keepalive we check here, rekeying is checked in clientloop.
576: */
1.251 dtucker 577: if (server_alive_time != 0 && server_alive_time <= monotime())
1.320 djm 578: server_alive_check(ssh);
1.249 dtucker 579: }
580:
1.11 markus 581: }
582:
1.77 itojun 583: static void
1.315 markus 584: client_suspend_self(struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr)
1.1 deraadt 585: {
1.11 markus 586: /* Flush stdout and stderr buffers. */
1.315 markus 587: if (sshbuf_len(bout) > 0)
588: atomicio(vwrite, fileno(stdout), sshbuf_mutable_ptr(bout),
589: sshbuf_len(bout));
590: if (sshbuf_len(berr) > 0)
591: atomicio(vwrite, fileno(stderr), sshbuf_mutable_ptr(berr),
592: sshbuf_len(berr));
1.11 markus 593:
1.233 djm 594: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 595:
1.305 djm 596: sshbuf_reset(bin);
597: sshbuf_reset(bout);
598: sshbuf_reset(berr);
1.11 markus 599:
600: /* Send the suspend signal to the program itself. */
601: kill(getpid(), SIGTSTP);
602:
1.132 djm 603: /* Reset window sizes in case they have changed */
604: received_window_change_signal = 1;
1.11 markus 605:
1.233 djm 606: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 607: }
608:
1.77 itojun 609: static void
1.320 djm 610: client_process_net_input(struct ssh *ssh, fd_set *readset)
1.11 markus 611: {
1.17 markus 612: char buf[8192];
1.315 markus 613: int r, len;
1.11 markus 614:
1.13 markus 615: /*
616: * Read input from the server, and add any such data to the buffer of
617: * the packet subsystem.
618: */
1.11 markus 619: if (FD_ISSET(connection_in, readset)) {
620: /* Read as much as possible. */
1.280 markus 621: len = read(connection_in, buf, sizeof(buf));
622: if (len == 0) {
1.197 djm 623: /*
624: * Received EOF. The remote host has closed the
625: * connection.
626: */
1.315 markus 627: if ((r = sshbuf_putf(stderr_buffer,
1.197 djm 628: "Connection to %.300s closed by remote host.\r\n",
1.315 markus 629: host)) != 0)
630: fatal("%s: buffer error: %s",
631: __func__, ssh_err(r));
1.1 deraadt 632: quit_pending = 1;
633: return;
1.11 markus 634: }
1.13 markus 635: /*
636: * There is a kernel bug on Solaris that causes select to
637: * sometimes wake up even though there is no data available.
638: */
1.53 millert 639: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 640: len = 0;
641:
642: if (len < 0) {
1.197 djm 643: /*
644: * An error has encountered. Perhaps there is a
645: * network problem.
646: */
1.315 markus 647: if ((r = sshbuf_putf(stderr_buffer,
1.197 djm 648: "Read from remote host %.300s: %.100s\r\n",
1.315 markus 649: host, strerror(errno))) != 0)
650: fatal("%s: buffer error: %s",
651: __func__, ssh_err(r));
1.11 markus 652: quit_pending = 1;
653: return;
654: }
1.320 djm 655: ssh_packet_process_incoming(ssh, buf, len);
1.11 markus 656: }
1.17 markus 657: }
1.16 markus 658:
1.97 jakob 659: static void
1.303 djm 660: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 661: {
1.190 djm 662: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
663: char errmsg[256];
1.315 markus 664: int r, tochan;
1.190 djm 665:
1.234 djm 666: /*
667: * If a TTY was explicitly requested, then a failure to allocate
668: * one is fatal.
669: */
670: if (cr->action == CONFIRM_TTY &&
671: (options.request_tty == REQUEST_TTY_FORCE ||
672: options.request_tty == REQUEST_TTY_YES))
673: cr->action = CONFIRM_CLOSE;
674:
1.312 djm 675: /* XXX suppress on mux _client_ quietmode */
1.190 djm 676: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 677: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 678:
679: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
680: debug2("%s request accepted on channel %d",
681: cr->request_type, c->self);
682: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
683: if (tochan) {
684: snprintf(errmsg, sizeof(errmsg),
685: "%s request failed\r\n", cr->request_type);
686: } else {
687: snprintf(errmsg, sizeof(errmsg),
688: "%s request failed on channel %d",
689: cr->request_type, c->self);
690: }
691: /* If error occurred on primary session channel, then exit */
1.234 djm 692: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 693: fatal("%s", errmsg);
1.234 djm 694: /*
695: * If error occurred on mux client, append to
696: * their stderr.
697: */
698: if (tochan) {
1.315 markus 699: if ((r = sshbuf_put(c->extended, errmsg,
700: strlen(errmsg))) != 0)
701: fatal("%s: buffer error %s", __func__,
702: ssh_err(r));
1.234 djm 703: } else
1.190 djm 704: error("%s", errmsg);
1.234 djm 705: if (cr->action == CONFIRM_TTY) {
706: /*
707: * If a TTY allocation error occurred, then arrange
708: * for the correct TTY to leave raw mode.
709: */
710: if (c->self == session_ident)
711: leave_raw_mode(0);
712: else
1.303 djm 713: mux_tty_alloc_failed(ssh, c);
1.234 djm 714: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 715: chan_read_failed(ssh, c);
716: chan_write_failed(ssh, c);
1.190 djm 717: }
718: }
1.250 djm 719: free(cr);
1.190 djm 720: }
721:
722: static void
1.303 djm 723: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 724: {
1.250 djm 725: free(ctx);
1.190 djm 726: }
1.129 deraadt 727:
1.236 djm 728: void
1.303 djm 729: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 730: enum confirm_action action)
1.190 djm 731: {
1.255 djm 732: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 733:
1.190 djm 734: cr->request_type = request;
1.234 djm 735: cr->action = action;
1.123 djm 736:
1.303 djm 737: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 738: client_abandon_status_confirm, cr);
1.196 djm 739: }
740:
741: void
742: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
743: {
1.201 djm 744: struct global_confirm *gc, *last_gc;
1.196 djm 745:
746: /* Coalesce identical callbacks */
1.201 djm 747: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
748: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
749: if (++last_gc->ref_count >= INT_MAX)
750: fatal("%s: last_gc->ref_count = %d",
751: __func__, last_gc->ref_count);
1.196 djm 752: return;
753: }
754:
1.255 djm 755: gc = xcalloc(1, sizeof(*gc));
1.196 djm 756: gc->cb = cb;
757: gc->ctx = ctx;
758: gc->ref_count = 1;
759: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 760: }
761:
762: static void
1.303 djm 763: process_cmdline(struct ssh *ssh)
1.97 jakob 764: {
765: void (*handler)(int);
1.261 millert 766: char *s, *cmd;
767: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
768: struct Forward fwd;
1.97 jakob 769:
1.257 tedu 770: memset(&fwd, 0, sizeof(fwd));
1.183 djm 771:
1.233 djm 772: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 773: handler = signal(SIGINT, SIG_IGN);
1.99 markus 774: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 775: if (s == NULL)
776: goto out;
1.256 deraadt 777: while (isspace((u_char)*s))
1.97 jakob 778: s++;
1.121 djm 779: if (*s == '-')
780: s++; /* Skip cmdline '-', if any */
1.120 dtucker 781: if (*s == '\0')
1.97 jakob 782: goto out;
1.121 djm 783:
1.122 djm 784: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 785: logit("Commands:");
1.164 djm 786: logit(" -L[bind_address:]port:host:hostport "
787: "Request local forward");
788: logit(" -R[bind_address:]port:host:hostport "
789: "Request remote forward");
1.204 stevesk 790: logit(" -D[bind_address:]port "
791: "Request dynamic forward");
1.237 markus 792: logit(" -KL[bind_address:]port "
793: "Cancel local forward");
1.165 stevesk 794: logit(" -KR[bind_address:]port "
1.164 djm 795: "Cancel remote forward");
1.237 markus 796: logit(" -KD[bind_address:]port "
797: "Cancel dynamic forward");
1.146 reyk 798: if (!options.permit_local_command)
799: goto out;
1.164 djm 800: logit(" !args "
801: "Execute local command");
1.146 reyk 802: goto out;
803: }
804:
805: if (*s == '!' && options.permit_local_command) {
806: s++;
807: ssh_local_cmd(s);
1.121 djm 808: goto out;
809: }
810:
811: if (*s == 'K') {
812: delete = 1;
813: s++;
814: }
1.204 stevesk 815: if (*s == 'L')
816: local = 1;
817: else if (*s == 'R')
818: remote = 1;
819: else if (*s == 'D')
820: dynamic = 1;
821: else {
1.109 itojun 822: logit("Invalid command.");
1.97 jakob 823: goto out;
824: }
1.204 stevesk 825:
1.256 deraadt 826: while (isspace((u_char)*++s))
1.179 tedu 827: ;
1.97 jakob 828:
1.217 djm 829: /* XXX update list of forwards in options */
1.121 djm 830: if (delete) {
1.261 millert 831: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
832: if (!parse_forward(&fwd, s, 1, 0)) {
833: logit("Bad forwarding close specification.");
1.121 djm 834: goto out;
835: }
1.237 markus 836: if (remote)
1.303 djm 837: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 838: else if (dynamic)
1.303 djm 839: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 840: 0, &options.fwd_opts) > 0;
1.237 markus 841: else
1.303 djm 842: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 843: CHANNEL_CANCEL_PORT_STATIC,
844: &options.fwd_opts) > 0;
1.237 markus 845: if (!ok) {
1.290 dtucker 846: logit("Unknown port forwarding.");
1.237 markus 847: goto out;
848: }
849: logit("Canceled forwarding.");
1.121 djm 850: } else {
1.209 djm 851: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 852: logit("Bad forwarding specification.");
853: goto out;
854: }
1.204 stevesk 855: if (local || dynamic) {
1.303 djm 856: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 857: &options.fwd_opts)) {
1.121 djm 858: logit("Port forwarding failed.");
859: goto out;
860: }
1.135 djm 861: } else {
1.303 djm 862: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 863: logit("Port forwarding failed.");
864: goto out;
865: }
1.135 djm 866: }
1.121 djm 867: logit("Forwarding port.");
868: }
869:
1.97 jakob 870: out:
871: signal(SIGINT, handler);
1.233 djm 872: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 873: free(cmd);
874: free(fwd.listen_host);
1.261 millert 875: free(fwd.listen_path);
1.250 djm 876: free(fwd.connect_host);
1.261 millert 877: free(fwd.connect_path);
1.97 jakob 878: }
879:
1.244 dtucker 880: /* reasons to suppress output of an escape command in help output */
881: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 882: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
883: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
884: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.244 dtucker 885: struct escape_help_text {
886: const char *cmd;
887: const char *text;
888: unsigned int flags;
889: };
890: static struct escape_help_text esc_txt[] = {
891: {".", "terminate session", SUPPRESS_MUXMASTER},
892: {".", "terminate connection (and any multiplexed sessions)",
893: SUPPRESS_MUXCLIENT},
1.292 djm 894: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.244 dtucker 895: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1.292 djm 896: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 897: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 898: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
899: {"#", "list forwarded connections", SUPPRESS_NEVER},
900: {"&", "background ssh (when waiting for connections to terminate)",
901: SUPPRESS_MUXCLIENT},
902: {"?", "this message", SUPPRESS_NEVER},
903: };
904:
905: static void
1.315 markus 906: print_escape_help(struct sshbuf *b, int escape_char, int mux_client,
907: int using_stderr)
1.244 dtucker 908: {
909: unsigned int i, suppress_flags;
1.315 markus 910: int r;
1.244 dtucker 911:
1.315 markus 912: if ((r = sshbuf_putf(b,
913: "%c?\r\nSupported escape sequences:\r\n", escape_char)) != 0)
914: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.244 dtucker 915:
1.292 djm 916: suppress_flags =
1.244 dtucker 917: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
918: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
919: (using_stderr ? 0 : SUPPRESS_SYSLOG);
920:
921: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
922: if (esc_txt[i].flags & suppress_flags)
923: continue;
1.315 markus 924: if ((r = sshbuf_putf(b, " %c%-3s - %s\r\n",
925: escape_char, esc_txt[i].cmd, esc_txt[i].text)) != 0)
926: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.244 dtucker 927: }
928:
1.315 markus 929: if ((r = sshbuf_putf(b,
1.246 dtucker 930: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 931: "(Note that escapes are only recognized immediately after "
1.315 markus 932: "newline.)\r\n", escape_char, escape_char)) != 0)
933: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.244 dtucker 934: }
935:
1.314 djm 936: /*
1.296 naddy 937: * Process the characters one by one.
1.195 djm 938: */
1.77 itojun 939: static int
1.303 djm 940: process_escapes(struct ssh *ssh, Channel *c,
1.315 markus 941: struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr,
1.195 djm 942: char *buf, int len)
1.31 markus 943: {
944: pid_t pid;
1.315 markus 945: int r, bytes = 0;
1.42 markus 946: u_int i;
947: u_char ch;
1.31 markus 948: char *s;
1.294 djm 949: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
950: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 951:
1.294 djm 952: if (c->filter_ctx == NULL)
953: return 0;
1.314 djm 954:
1.139 djm 955: if (len <= 0)
956: return (0);
957:
958: for (i = 0; i < (u_int)len; i++) {
1.31 markus 959: /* Get one character at a time. */
960: ch = buf[i];
961:
1.294 djm 962: if (efc->escape_pending) {
1.31 markus 963: /* We have previously seen an escape character. */
964: /* Clear the flag now. */
1.294 djm 965: efc->escape_pending = 0;
1.31 markus 966:
967: /* Process the escaped character. */
968: switch (ch) {
969: case '.':
970: /* Terminate the connection. */
1.315 markus 971: if ((r = sshbuf_putf(berr, "%c.\r\n",
972: efc->escape_char)) != 0)
973: fatal("%s: buffer error: %s",
974: __func__, ssh_err(r));
1.217 djm 975: if (c && c->ctl_chan != -1) {
1.303 djm 976: chan_read_failed(ssh, c);
977: chan_write_failed(ssh, c);
978: if (c->detach_user) {
979: c->detach_user(ssh,
980: c->self, NULL);
981: }
1.253 dtucker 982: c->type = SSH_CHANNEL_ABANDONED;
1.315 markus 983: sshbuf_reset(c->input);
1.303 djm 984: chan_ibuf_empty(ssh, c);
1.195 djm 985: return 0;
986: } else
987: quit_pending = 1;
1.31 markus 988: return -1;
989:
990: case 'Z' - 64:
1.195 djm 991: /* XXX support this for mux clients */
1.217 djm 992: if (c && c->ctl_chan != -1) {
1.245 dtucker 993: char b[16];
1.195 djm 994: noescape:
1.245 dtucker 995: if (ch == 'Z' - 64)
996: snprintf(b, sizeof b, "^Z");
997: else
998: snprintf(b, sizeof b, "%c", ch);
1.315 markus 999: if ((r = sshbuf_putf(berr,
1.245 dtucker 1000: "%c%s escape not available to "
1.195 djm 1001: "multiplexed sessions\r\n",
1.315 markus 1002: efc->escape_char, b)) != 0)
1003: fatal("%s: buffer error: %s",
1004: __func__, ssh_err(r));
1.195 djm 1005: continue;
1006: }
1.197 djm 1007: /* Suspend the program. Inform the user */
1.315 markus 1008: if ((r = sshbuf_putf(berr,
1009: "%c^Z [suspend ssh]\r\n",
1010: efc->escape_char)) != 0)
1011: fatal("%s: buffer error: %s",
1012: __func__, ssh_err(r));
1.31 markus 1013:
1014: /* Restore terminal modes and suspend. */
1015: client_suspend_self(bin, bout, berr);
1016:
1017: /* We have been continued. */
1018: continue;
1019:
1.111 markus 1020: case 'B':
1.315 markus 1021: if ((r = sshbuf_putf(berr,
1022: "%cB\r\n", efc->escape_char)) != 0)
1023: fatal("%s: buffer error: %s",
1024: __func__, ssh_err(r));
1.303 djm 1025: channel_request_start(ssh, c->self, "break", 0);
1.315 markus 1026: if ((r = sshpkt_put_u32(ssh, 1000)) != 0 ||
1027: (r = sshpkt_send(ssh)) != 0)
1.322 djm 1028: fatal("%s: send packet: %s", __func__,
1.315 markus 1029: ssh_err(r));
1.111 markus 1030: continue;
1031:
1.54 markus 1032: case 'R':
1.292 djm 1033: if (datafellows & SSH_BUG_NOREKEY)
1034: logit("Server does not "
1035: "support re-keying");
1036: else
1037: need_rekeying = 1;
1.54 markus 1038: continue;
1039:
1.242 dtucker 1040: case 'V':
1041: /* FALLTHROUGH */
1042: case 'v':
1043: if (c && c->ctl_chan != -1)
1044: goto noescape;
1045: if (!log_is_on_stderr()) {
1.315 markus 1046: if ((r = sshbuf_putf(berr,
1.242 dtucker 1047: "%c%c [Logging to syslog]\r\n",
1.315 markus 1048: efc->escape_char, ch)) != 0)
1049: fatal("%s: buffer error: %s",
1050: __func__, ssh_err(r));
1.242 dtucker 1051: continue;
1052: }
1053: if (ch == 'V' && options.log_level >
1054: SYSLOG_LEVEL_QUIET)
1055: log_change_level(--options.log_level);
1056: if (ch == 'v' && options.log_level <
1057: SYSLOG_LEVEL_DEBUG3)
1058: log_change_level(++options.log_level);
1.315 markus 1059: if ((r = sshbuf_putf(berr,
1.294 djm 1060: "%c%c [LogLevel %s]\r\n",
1061: efc->escape_char, ch,
1.315 markus 1062: log_level_name(options.log_level))) != 0)
1063: fatal("%s: buffer error: %s",
1064: __func__, ssh_err(r));
1.242 dtucker 1065: continue;
1066:
1.31 markus 1067: case '&':
1.217 djm 1068: if (c && c->ctl_chan != -1)
1.195 djm 1069: goto noescape;
1.31 markus 1070: /*
1.197 djm 1071: * Detach the program (continue to serve
1072: * connections, but put in background and no
1073: * more new connections).
1.31 markus 1074: */
1075: /* Restore tty modes. */
1.233 djm 1076: leave_raw_mode(
1077: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1078:
1079: /* Stop listening for new connections. */
1.303 djm 1080: channel_stop_listening(ssh);
1.31 markus 1081:
1.315 markus 1082: if ((r = sshbuf_putf(berr,
1083: "%c& [backgrounded]\n", efc->escape_char))
1084: != 0)
1085: fatal("%s: buffer error: %s",
1086: __func__, ssh_err(r));
1.31 markus 1087:
1088: /* Fork into background. */
1089: pid = fork();
1090: if (pid < 0) {
1091: error("fork: %.100s", strerror(errno));
1092: continue;
1093: }
1094: if (pid != 0) { /* This is the parent. */
1095: /* The parent just exits. */
1096: exit(0);
1097: }
1098: /* The child continues serving connections. */
1.292 djm 1099: /* fake EOF on stdin */
1.315 markus 1100: if ((r = sshbuf_put_u8(bin, 4)) != 0)
1101: fatal("%s: buffer error: %s",
1102: __func__, ssh_err(r));
1.292 djm 1103: return -1;
1.31 markus 1104: case '?':
1.294 djm 1105: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1106: (c && c->ctl_chan != -1),
1107: log_is_on_stderr());
1.31 markus 1108: continue;
1109:
1110: case '#':
1.315 markus 1111: if ((r = sshbuf_putf(berr, "%c#\r\n",
1112: efc->escape_char)) != 0)
1113: fatal("%s: buffer error: %s",
1114: __func__, ssh_err(r));
1.303 djm 1115: s = channel_open_message(ssh);
1.315 markus 1116: if ((r = sshbuf_put(berr, s, strlen(s))) != 0)
1117: fatal("%s: buffer error: %s",
1118: __func__, ssh_err(r));
1.250 djm 1119: free(s);
1.97 jakob 1120: continue;
1121:
1122: case 'C':
1.217 djm 1123: if (c && c->ctl_chan != -1)
1.206 djm 1124: goto noescape;
1.303 djm 1125: process_cmdline(ssh);
1.31 markus 1126: continue;
1127:
1128: default:
1.294 djm 1129: if (ch != efc->escape_char) {
1.315 markus 1130: if ((r = sshbuf_put_u8(bin,
1131: efc->escape_char)) != 0)
1132: fatal("%s: buffer error: %s",
1133: __func__, ssh_err(r));
1.31 markus 1134: bytes++;
1135: }
1136: /* Escaped characters fall through here */
1137: break;
1138: }
1139: } else {
1140: /*
1.197 djm 1141: * The previous character was not an escape char.
1142: * Check if this is an escape.
1.31 markus 1143: */
1.294 djm 1144: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1145: /*
1146: * It is. Set the flag and continue to
1147: * next character.
1148: */
1.294 djm 1149: efc->escape_pending = 1;
1.31 markus 1150: continue;
1151: }
1152: }
1153:
1154: /*
1155: * Normal character. Record whether it was a newline,
1156: * and append it to the buffer.
1157: */
1158: last_was_cr = (ch == '\r' || ch == '\n');
1.315 markus 1159: if ((r = sshbuf_put_u8(bin, ch)) != 0)
1160: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.31 markus 1161: bytes++;
1162: }
1163: return bytes;
1164: }
1165:
1.13 markus 1166: /*
1.15 markus 1167: * Get packets from the connection input buffer, and process them as long as
1168: * there are packets available.
1169: *
1170: * Any unknown packets received during the actual
1171: * session cause the session to terminate. This is
1172: * intended to make debugging easier since no
1173: * confirmations are sent. Any compatible protocol
1174: * extensions must be negotiated during the
1175: * preparatory phase.
1176: */
1177:
1.77 itojun 1178: static void
1.321 djm 1179: client_process_buffered_input_packets(struct ssh *ssh)
1.15 markus 1180: {
1.321 djm 1181: ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1182: }
1183:
1.31 markus 1184: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1185:
1.195 djm 1186: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1187: void *
1188: client_new_escape_filter_ctx(int escape_char)
1189: {
1190: struct escape_filter_ctx *ret;
1191:
1.255 djm 1192: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1193: ret->escape_pending = 0;
1194: ret->escape_char = escape_char;
1195: return (void *)ret;
1196: }
1197:
1.198 djm 1198: /* Free the escape filter context on channel free */
1199: void
1.303 djm 1200: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1201: {
1.250 djm 1202: free(ctx);
1.198 djm 1203: }
1204:
1.195 djm 1205: int
1.303 djm 1206: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1207: {
1.190 djm 1208: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1209: return 0;
1210:
1.303 djm 1211: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1212: buf, len);
1.30 markus 1213: }
1214:
1.77 itojun 1215: static void
1.303 djm 1216: client_channel_closed(struct ssh *ssh, int id, void *arg)
1.60 markus 1217: {
1.303 djm 1218: channel_cancel_cleanup(ssh, id);
1.60 markus 1219: session_closed = 1;
1.233 djm 1220: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1221: }
1222:
1.15 markus 1223: /*
1.13 markus 1224: * Implements the interactive session with the server. This is called after
1225: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1226: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1227: * used as an escape character for terminating or suspending the session.
1.13 markus 1228: */
1.20 markus 1229: int
1.303 djm 1230: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1231: int ssh2_chan_id)
1.1 deraadt 1232: {
1.46 markus 1233: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1234: double start_time, total_time;
1.284 djm 1235: int r, max_fd = 0, max_fd2 = 0, len;
1.200 markus 1236: u_int64_t ibytes, obytes;
1.130 avsm 1237: u_int nalloc = 0;
1.11 markus 1238: char buf[100];
1239:
1240: debug("Entering interactive session.");
1.277 semarie 1241:
1.278 semarie 1242: if (options.control_master &&
1.286 djm 1243: !option_clear_or_none(options.control_path)) {
1.278 semarie 1244: debug("pledge: id");
1.285 tb 1245: if (pledge("stdio rpath wpath cpath unix inet dns recvfd proc exec id tty",
1.278 semarie 1246: NULL) == -1)
1247: fatal("%s pledge(): %s", __func__, strerror(errno));
1248:
1249: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1250: debug("pledge: exec");
1251: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1252: NULL) == -1)
1253: fatal("%s pledge(): %s", __func__, strerror(errno));
1254:
1255: } else if (options.update_hostkeys) {
1256: debug("pledge: filesystem full");
1257: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1258: NULL) == -1)
1259: fatal("%s pledge(): %s", __func__, strerror(errno));
1260:
1.286 djm 1261: } else if (!option_clear_or_none(options.proxy_command) ||
1262: fork_after_authentication_flag) {
1.277 semarie 1263: debug("pledge: proc");
1264: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1265: fatal("%s pledge(): %s", __func__, strerror(errno));
1266:
1267: } else {
1268: debug("pledge: network");
1.300 mestre 1269: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.277 semarie 1270: fatal("%s pledge(): %s", __func__, strerror(errno));
1271: }
1.11 markus 1272:
1.307 dtucker 1273: start_time = monotime_double();
1.11 markus 1274:
1275: /* Initialize variables. */
1276: last_was_cr = 1;
1277: exit_status = -1;
1.320 djm 1278: connection_in = ssh_packet_get_connection_in(ssh);
1279: connection_out = ssh_packet_get_connection_out(ssh);
1.287 deraadt 1280: max_fd = MAXIMUM(connection_in, connection_out);
1.46 markus 1281:
1.11 markus 1282: quit_pending = 0;
1283:
1.315 markus 1284: /* Initialize buffer. */
1285: if ((stderr_buffer = sshbuf_new()) == NULL)
1286: fatal("%s: sshbuf_new failed", __func__);
1.11 markus 1287:
1.321 djm 1288: client_init_dispatch(ssh);
1.15 markus 1289:
1.105 markus 1290: /*
1291: * Set signal handlers, (e.g. to restore non-blocking mode)
1292: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1293: */
1.131 djm 1294: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1295: signal(SIGHUP, signal_handler);
1.105 markus 1296: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1297: signal(SIGINT, signal_handler);
1298: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1299: signal(SIGQUIT, signal_handler);
1300: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1301: signal(SIGTERM, signal_handler);
1.132 djm 1302: signal(SIGWINCH, window_change_handler);
1.11 markus 1303:
1304: if (have_pty)
1.233 djm 1305: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1306:
1.292 djm 1307: session_ident = ssh2_chan_id;
1308: if (session_ident != -1) {
1309: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1310: channel_register_filter(ssh, session_ident,
1.292 djm 1311: client_simple_escape_filter, NULL,
1312: client_filter_cleanup,
1313: client_new_escape_filter_ctx(
1314: escape_char_arg));
1.232 djm 1315: }
1.303 djm 1316: channel_register_cleanup(ssh, session_ident,
1.292 djm 1317: client_channel_closed, 0);
1.48 markus 1318: }
1.30 markus 1319:
1.11 markus 1320: /* Main loop of the client for the interactive session mode. */
1321: while (!quit_pending) {
1322:
1.13 markus 1323: /* Process buffered packets sent by the server. */
1.321 djm 1324: client_process_buffered_input_packets(ssh);
1.11 markus 1325:
1.303 djm 1326: if (session_closed && !channel_still_open(ssh))
1.60 markus 1327: break;
1328:
1.303 djm 1329: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1330: debug("rekeying in progress");
1.284 djm 1331: } else if (need_rekeying) {
1332: /* manual rekey request */
1333: debug("need rekeying");
1.303 djm 1334: if ((r = kex_start_rekex(ssh)) != 0)
1.284 djm 1335: fatal("%s: kex_start_rekex: %s", __func__,
1336: ssh_err(r));
1337: need_rekeying = 0;
1.56 markus 1338: } else {
1339: /*
1340: * Make packets from buffered channel data, and
1341: * enqueue them for sending to the server.
1342: */
1.320 djm 1343: if (ssh_packet_not_very_much_data_to_write(ssh))
1.303 djm 1344: channel_output_poll(ssh);
1.11 markus 1345:
1.56 markus 1346: /*
1347: * Check if the window size has changed, and buffer a
1348: * message about it to the server if so.
1349: */
1.303 djm 1350: client_check_window_change(ssh);
1.11 markus 1351:
1.56 markus 1352: if (quit_pending)
1353: break;
1354: }
1.13 markus 1355: /*
1356: * Wait until we have something to do (something becomes
1357: * available on one of the descriptors).
1358: */
1.81 markus 1359: max_fd2 = max_fd;
1.303 djm 1360: client_wait_until_can_do_something(ssh, &readset, &writeset,
1361: &max_fd2, &nalloc, ssh_packet_is_rekeying(ssh));
1.11 markus 1362:
1363: if (quit_pending)
1364: break;
1365:
1.56 markus 1366: /* Do channel operations unless rekeying in progress. */
1.303 djm 1367: if (!ssh_packet_is_rekeying(ssh))
1368: channel_after_select(ssh, readset, writeset);
1.11 markus 1369:
1.17 markus 1370: /* Buffer input from the connection. */
1.320 djm 1371: client_process_net_input(ssh, readset);
1.17 markus 1372:
1373: if (quit_pending)
1374: break;
1.11 markus 1375:
1.197 djm 1376: /*
1377: * Send as much buffered packet data as possible to the
1378: * sender.
1379: */
1.46 markus 1380: if (FD_ISSET(connection_out, writeset))
1.320 djm 1381: ssh_packet_write_poll(ssh);
1.222 djm 1382:
1383: /*
1384: * If we are a backgrounded control master, and the
1385: * timeout has expired without any active client
1386: * connections, then quit.
1387: */
1388: if (control_persist_exit_time > 0) {
1.251 dtucker 1389: if (monotime() >= control_persist_exit_time) {
1.222 djm 1390: debug("ControlPersist timeout expired");
1391: break;
1392: }
1393: }
1.11 markus 1394: }
1.250 djm 1395: free(readset);
1396: free(writeset);
1.11 markus 1397:
1398: /* Terminate the session. */
1399:
1400: /* Stop watching for window change. */
1.132 djm 1401: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1402:
1.320 djm 1403: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
1404: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_BY_APPLICATION)) != 0 ||
1405: (r = sshpkt_put_cstring(ssh, "disconnected by user")) != 0 ||
1406: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language tag */
1407: (r = sshpkt_send(ssh)) != 0 ||
1408: (r = ssh_packet_write_wait(ssh)) != 0)
1.322 djm 1409: fatal("%s: send disconnect: %s", __func__, ssh_err(r));
1.11 markus 1410:
1.303 djm 1411: channel_free_all(ssh);
1.11 markus 1412:
1.75 markus 1413: if (have_pty)
1.233 djm 1414: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1415:
1416: /* restore blocking io */
1417: if (!isatty(fileno(stdin)))
1418: unset_nonblock(fileno(stdin));
1419: if (!isatty(fileno(stdout)))
1420: unset_nonblock(fileno(stdout));
1421: if (!isatty(fileno(stderr)))
1422: unset_nonblock(fileno(stderr));
1.116 dtucker 1423:
1424: /*
1425: * If there was no shell or command requested, there will be no remote
1426: * exit status to be returned. In that case, clear error code if the
1427: * connection was deliberately terminated at this end.
1428: */
1429: if (no_shell_flag && received_signal == SIGTERM) {
1430: received_signal = 0;
1431: exit_status = 0;
1432: }
1.75 markus 1433:
1.301 dtucker 1434: if (received_signal) {
1435: verbose("Killed by signal %d.", (int) received_signal);
1436: cleanup_exit(0);
1437: }
1.75 markus 1438:
1.13 markus 1439: /*
1440: * In interactive mode (with pseudo tty) display a message indicating
1441: * that the connection has been closed.
1442: */
1.11 markus 1443: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.315 markus 1444: if ((r = sshbuf_putf(stderr_buffer,
1445: "Connection to %.64s closed.\r\n", host)) != 0)
1446: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.11 markus 1447: }
1.70 markus 1448:
1.11 markus 1449: /* Output any buffered data for stderr. */
1.315 markus 1450: if (sshbuf_len(stderr_buffer) > 0) {
1.230 djm 1451: len = atomicio(vwrite, fileno(stderr),
1.315 markus 1452: (u_char *)sshbuf_ptr(stderr_buffer),
1453: sshbuf_len(stderr_buffer));
1454: if (len < 0 || (u_int)len != sshbuf_len(stderr_buffer))
1.11 markus 1455: error("Write failed flushing stderr buffer.");
1.315 markus 1456: else if ((r = sshbuf_consume(stderr_buffer, len)) != 0)
1457: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.11 markus 1458: }
1459:
1460: /* Clear and free any buffers. */
1.281 jsg 1461: explicit_bzero(buf, sizeof(buf));
1.315 markus 1462: sshbuf_free(stderr_buffer);
1.11 markus 1463:
1464: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1465: total_time = monotime_double() - start_time;
1.320 djm 1466: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.200 markus 1467: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1468: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1469: if (total_time > 0)
1.200 markus 1470: verbose("Bytes per second: sent %.1f, received %.1f",
1471: obytes / total_time, ibytes / total_time);
1.11 markus 1472: /* Return the exit status of the program. */
1473: debug("Exit status %d", exit_status);
1474: return exit_status;
1.15 markus 1475: }
1476:
1477: /*********/
1478:
1.77 itojun 1479: static Channel *
1.303 djm 1480: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1481: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1482: {
1.103 deraadt 1483: Channel *c = NULL;
1.289 markus 1484: struct sshbuf *b = NULL;
1.40 markus 1485: char *listen_address, *originator_address;
1.320 djm 1486: u_int listen_port, originator_port;
1.289 markus 1487: int r;
1.40 markus 1488:
1489: /* Get rest of the packet */
1.320 djm 1490: if ((r = sshpkt_get_cstring(ssh, &listen_address, NULL)) != 0 ||
1491: (r = sshpkt_get_u32(ssh, &listen_port)) != 0 ||
1492: (r = sshpkt_get_cstring(ssh, &originator_address, NULL)) != 0 ||
1493: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1494: (r = sshpkt_get_end(ssh)) != 0)
1.322 djm 1495: fatal("%s: parse packet: %s", __func__, ssh_err(r));
1.40 markus 1496:
1.261 millert 1497: debug("%s: listen %s port %d, originator %s port %d", __func__,
1498: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1499:
1.320 djm 1500: if (listen_port > 0xffff)
1501: error("%s: invalid listen port", __func__);
1502: else if (originator_port > 0xffff)
1503: error("%s: invalid originator port", __func__);
1504: else {
1505: c = channel_connect_by_listen_address(ssh,
1506: listen_address, listen_port, "forwarded-tcpip",
1507: originator_address);
1508: }
1.40 markus 1509:
1.289 markus 1510: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1511: if ((b = sshbuf_new()) == NULL) {
1512: error("%s: alloc reply", __func__);
1513: goto out;
1514: }
1515: /* reconstruct and send to muxclient */
1516: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1517: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1518: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1519: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1520: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1521: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1522: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1523: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1524: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1525: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1526: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.289 markus 1527: error("%s: compose for muxclient %s", __func__,
1528: ssh_err(r));
1529: goto out;
1530: }
1531: }
1532:
1533: out:
1534: sshbuf_free(b);
1.250 djm 1535: free(originator_address);
1536: free(listen_address);
1.40 markus 1537: return c;
1538: }
1539:
1.103 deraadt 1540: static Channel *
1.303 djm 1541: client_request_forwarded_streamlocal(struct ssh *ssh,
1542: const char *request_type, int rchan)
1.261 millert 1543: {
1544: Channel *c = NULL;
1545: char *listen_path;
1.320 djm 1546: int r;
1.261 millert 1547:
1548: /* Get the remote path. */
1.320 djm 1549: if ((r = sshpkt_get_cstring(ssh, &listen_path, NULL)) != 0 ||
1550: (r = sshpkt_get_string(ssh, NULL, NULL)) != 0 || /* reserved */
1551: (r = sshpkt_get_end(ssh)) != 0)
1.322 djm 1552: fatal("%s: parse packet: %s", __func__, ssh_err(r));
1.261 millert 1553:
1.322 djm 1554: debug("%s: request: %s", __func__, listen_path);
1.261 millert 1555:
1.303 djm 1556: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1557: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1558: free(listen_path);
1559: return c;
1560: }
1561:
1562: static Channel *
1.303 djm 1563: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1564: {
1565: Channel *c = NULL;
1566: char *originator;
1.321 djm 1567: u_int originator_port;
1.320 djm 1568: int r, sock;
1.40 markus 1569:
1570: if (!options.forward_x11) {
1571: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1572: error("Warning: this is probably a break-in attempt by a "
1573: "malicious server.");
1.221 djm 1574: return NULL;
1575: }
1.274 djm 1576: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1577: verbose("Rejected X11 connection after ForwardX11Timeout "
1578: "expired");
1.40 markus 1579: return NULL;
1580: }
1.320 djm 1581: if ((r = sshpkt_get_cstring(ssh, &originator, NULL)) != 0 ||
1.321 djm 1582: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1.320 djm 1583: (r = sshpkt_get_end(ssh)) != 0)
1.322 djm 1584: fatal("%s: parse packet: %s", __func__, ssh_err(r));
1.40 markus 1585: /* XXX check permission */
1.321 djm 1586: /* XXX range check originator port? */
1587: debug("client_request_x11: request from %s %u", originator,
1.47 markus 1588: originator_port);
1.250 djm 1589: free(originator);
1.303 djm 1590: sock = x11_connect_display(ssh);
1.67 markus 1591: if (sock < 0)
1592: return NULL;
1.303 djm 1593: c = channel_new(ssh, "x11",
1.67 markus 1594: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1595: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1596: c->force_drain = 1;
1.40 markus 1597: return c;
1598: }
1599:
1.103 deraadt 1600: static Channel *
1.303 djm 1601: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1602: {
1603: Channel *c = NULL;
1.262 djm 1604: int r, sock;
1.40 markus 1605:
1606: if (!options.forward_agent) {
1607: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1608: error("Warning: this is probably a break-in attempt by a "
1609: "malicious server.");
1.40 markus 1610: return NULL;
1611: }
1.262 djm 1612: if ((r = ssh_get_authentication_socket(&sock)) != 0) {
1613: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1614: debug("%s: ssh_get_authentication_socket: %s",
1615: __func__, ssh_err(r));
1.67 markus 1616: return NULL;
1.262 djm 1617: }
1.303 djm 1618: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1619: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1620: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1621: "authentication agent connection", 1);
1.82 markus 1622: c->force_drain = 1;
1.40 markus 1623: return c;
1.180 djm 1624: }
1625:
1.306 djm 1626: char *
1.303 djm 1627: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1628: int local_tun, int remote_tun)
1.180 djm 1629: {
1630: Channel *c;
1.320 djm 1631: int r, fd;
1.306 djm 1632: char *ifname = NULL;
1.180 djm 1633:
1634: if (tun_mode == SSH_TUNMODE_NO)
1635: return 0;
1636:
1637: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1638:
1639: /* Open local tunnel device */
1.306 djm 1640: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1641: error("Tunnel device open failed.");
1.306 djm 1642: return NULL;
1.180 djm 1643: }
1.306 djm 1644: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1645:
1.303 djm 1646: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1647: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1648: c->datagram = 1;
1649:
1.320 djm 1650: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1651: (r = sshpkt_put_cstring(ssh, "tun@openssh.com")) != 0 ||
1652: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1653: (r = sshpkt_put_u32(ssh, c->local_window_max)) != 0 ||
1654: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1655: (r = sshpkt_put_u32(ssh, tun_mode)) != 0 ||
1656: (r = sshpkt_put_u32(ssh, remote_tun)) != 0 ||
1657: (r = sshpkt_send(ssh)) != 0)
1.321 djm 1658: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.180 djm 1659:
1.306 djm 1660: return ifname;
1.40 markus 1661: }
1662:
1.22 markus 1663: /* XXXX move to generic input handler */
1.264 markus 1664: static int
1.297 markus 1665: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1666: {
1667: Channel *c = NULL;
1.320 djm 1668: char *ctype = NULL;
1669: int r;
1670: u_int rchan;
1671: size_t len;
1672: u_int rmaxpack, rwindow;
1673:
1674: if ((r = sshpkt_get_cstring(ssh, &ctype, &len)) != 0 ||
1675: (r = sshpkt_get_u32(ssh, &rchan)) != 0 ||
1676: (r = sshpkt_get_u32(ssh, &rwindow)) != 0 ||
1677: (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0)
1678: goto out;
1.22 markus 1679:
1.24 markus 1680: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1681: ctype, rchan, rwindow, rmaxpack);
1682:
1.40 markus 1683: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1684: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1685: rmaxpack);
1.261 millert 1686: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1687: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1688: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1689: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1690: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1691: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1692: }
1.289 markus 1693: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1694: debug3("proxied to downstream: %s", ctype);
1695: } else if (c != NULL) {
1.22 markus 1696: debug("confirm %s", ctype);
1697: c->remote_id = rchan;
1.304 djm 1698: c->have_remote_id = 1;
1.22 markus 1699: c->remote_window = rwindow;
1700: c->remote_maxpacket = rmaxpack;
1.69 markus 1701: if (c->type != SSH_CHANNEL_CONNECTING) {
1.320 djm 1702: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1703: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1704: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1705: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1706: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1707: (r = sshpkt_send(ssh)) != 0)
1708: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.69 markus 1709: }
1.22 markus 1710: } else {
1711: debug("failure %s", ctype);
1.320 djm 1712: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
1713: (r = sshpkt_put_u32(ssh, rchan)) != 0 ||
1714: (r = sshpkt_put_u32(ssh, SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED)) != 0 ||
1715: (r = sshpkt_put_cstring(ssh, "open failed")) != 0 ||
1716: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1717: (r = sshpkt_send(ssh)) != 0)
1718: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.22 markus 1719: }
1.320 djm 1720: r = 0;
1721: out:
1.250 djm 1722: free(ctype);
1.320 djm 1723: return r;
1.22 markus 1724: }
1.267 djm 1725:
1.264 markus 1726: static int
1.297 markus 1727: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1728: {
1729: Channel *c = NULL;
1.320 djm 1730: char *rtype = NULL;
1731: u_char reply;
1732: u_int id, exitval;
1733: int r, success = 0;
1734:
1735: if ((r = sshpkt_get_u32(ssh, &id)) != 0)
1736: return r;
1737: if (id <= INT_MAX)
1738: c = channel_lookup(ssh, id);
1.297 markus 1739: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1740: return 0;
1.320 djm 1741: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
1742: (r = sshpkt_get_u8(ssh, &reply)) != 0)
1743: goto out;
1.48 markus 1744:
1.320 djm 1745: debug("client_input_channel_req: channel %u rtype %s reply %d",
1.48 markus 1746: id, rtype, reply);
1747:
1.320 djm 1748: if (c == NULL) {
1.197 djm 1749: error("client_input_channel_req: channel %d: "
1750: "unknown channel", id);
1.193 markus 1751: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1.320 djm 1752: if ((r = sshpkt_get_end(ssh)) != 0)
1753: goto out;
1.303 djm 1754: chan_rcvd_eow(ssh, c);
1.48 markus 1755: } else if (strcmp(rtype, "exit-status") == 0) {
1.320 djm 1756: if ((r = sshpkt_get_u32(ssh, &exitval)) != 0)
1757: goto out;
1.217 djm 1758: if (c->ctl_chan != -1) {
1.303 djm 1759: mux_exit_message(ssh, c, exitval);
1.215 djm 1760: success = 1;
1.320 djm 1761: } else if ((int)id == session_ident) {
1.215 djm 1762: /* Record exit value of local session */
1.123 djm 1763: success = 1;
1764: exit_status = exitval;
1.215 djm 1765: } else {
1.218 djm 1766: /* Probably for a mux channel that has already closed */
1767: debug("%s: no sink for exit-status on channel %d",
1768: __func__, id);
1.123 djm 1769: }
1.320 djm 1770: if ((r = sshpkt_get_end(ssh)) != 0)
1771: goto out;
1.48 markus 1772: }
1.259 djm 1773: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1774: if (!c->have_remote_id)
1775: fatal("%s: channel %d: no remote_id",
1776: __func__, c->self);
1.320 djm 1777: if ((r = sshpkt_start(ssh, success ?
1778: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE)) != 0 ||
1779: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1780: (r = sshpkt_send(ssh)) != 0)
1781: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.48 markus 1782: }
1.320 djm 1783: r = 0;
1784: out:
1.250 djm 1785: free(rtype);
1.320 djm 1786: return r;
1.48 markus 1787: }
1.267 djm 1788:
1.269 djm 1789: struct hostkeys_update_ctx {
1790: /* The hostname and (optionally) IP address string for the server */
1791: char *host_str, *ip_str;
1792:
1793: /*
1794: * Keys received from the server and a flag for each indicating
1795: * whether they already exist in known_hosts.
1796: * keys_seen is filled in by hostkeys_find() and later (for new
1797: * keys) by client_global_hostkeys_private_confirm().
1798: */
1799: struct sshkey **keys;
1800: int *keys_seen;
1.314 djm 1801: size_t nkeys, nnew;
1.269 djm 1802:
1803: /*
1804: * Keys that are in known_hosts, but were not present in the update
1805: * from the server (i.e. scheduled to be deleted).
1806: * Filled in by hostkeys_find().
1807: */
1808: struct sshkey **old_keys;
1809: size_t nold;
1810: };
1811:
1812: static void
1813: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1814: {
1815: size_t i;
1816:
1817: if (ctx == NULL)
1818: return;
1819: for (i = 0; i < ctx->nkeys; i++)
1820: sshkey_free(ctx->keys[i]);
1821: free(ctx->keys);
1822: free(ctx->keys_seen);
1823: for (i = 0; i < ctx->nold; i++)
1824: sshkey_free(ctx->old_keys[i]);
1825: free(ctx->old_keys);
1826: free(ctx->host_str);
1827: free(ctx->ip_str);
1828: free(ctx);
1829: }
1830:
1831: static int
1832: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1833: {
1834: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1835: size_t i;
1836: struct sshkey **tmp;
1837:
1.293 djm 1838: if (l->status != HKF_STATUS_MATCHED || l->key == NULL)
1.269 djm 1839: return 0;
1840:
1841: /* Mark off keys we've already seen for this host */
1842: for (i = 0; i < ctx->nkeys; i++) {
1843: if (sshkey_equal(l->key, ctx->keys[i])) {
1844: debug3("%s: found %s key at %s:%ld", __func__,
1845: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1846: ctx->keys_seen[i] = 1;
1847: return 0;
1848: }
1849: }
1850: /* This line contained a key that not offered by the server */
1851: debug3("%s: deprecated %s key at %s:%ld", __func__,
1852: sshkey_ssh_name(l->key), l->path, l->linenum);
1.299 deraadt 1853: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1854: sizeof(*ctx->old_keys))) == NULL)
1.299 deraadt 1855: fatal("%s: recallocarray failed nold = %zu",
1.269 djm 1856: __func__, ctx->nold);
1857: ctx->old_keys = tmp;
1858: ctx->old_keys[ctx->nold++] = l->key;
1859: l->key = NULL;
1860:
1861: return 0;
1862: }
1863:
1864: static void
1865: update_known_hosts(struct hostkeys_update_ctx *ctx)
1866: {
1.271 djm 1867: int r, was_raw = 0;
1.323 dtucker 1868: LogLevel loglevel = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK ?
1.269 djm 1869: SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1870: char *fp, *response;
1871: size_t i;
1872:
1873: for (i = 0; i < ctx->nkeys; i++) {
1874: if (ctx->keys_seen[i] != 2)
1875: continue;
1876: if ((fp = sshkey_fingerprint(ctx->keys[i],
1877: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1878: fatal("%s: sshkey_fingerprint failed", __func__);
1879: do_log2(loglevel, "Learned new hostkey: %s %s",
1880: sshkey_type(ctx->keys[i]), fp);
1881: free(fp);
1882: }
1883: for (i = 0; i < ctx->nold; i++) {
1884: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
1885: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1886: fatal("%s: sshkey_fingerprint failed", __func__);
1887: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
1888: sshkey_type(ctx->old_keys[i]), fp);
1889: free(fp);
1890: }
1891: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 1892: if (get_saved_tio() != NULL) {
1893: leave_raw_mode(1);
1894: was_raw = 1;
1895: }
1.269 djm 1896: response = NULL;
1897: for (i = 0; !quit_pending && i < 3; i++) {
1898: free(response);
1899: response = read_passphrase("Accept updated hostkeys? "
1900: "(yes/no): ", RP_ECHO);
1901: if (strcasecmp(response, "yes") == 0)
1902: break;
1903: else if (quit_pending || response == NULL ||
1904: strcasecmp(response, "no") == 0) {
1905: options.update_hostkeys = 0;
1906: break;
1907: } else {
1908: do_log2(loglevel, "Please enter "
1909: "\"yes\" or \"no\"");
1910: }
1911: }
1912: if (quit_pending || i >= 3 || response == NULL)
1913: options.update_hostkeys = 0;
1914: free(response);
1.271 djm 1915: if (was_raw)
1916: enter_raw_mode(1);
1.269 djm 1917: }
1918:
1919: /*
1920: * Now that all the keys are verified, we can go ahead and replace
1921: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
1922: * cancel the operation).
1923: */
1924: if (options.update_hostkeys != 0 &&
1925: (r = hostfile_replace_entries(options.user_hostfiles[0],
1926: ctx->host_str, ctx->ip_str, ctx->keys, ctx->nkeys,
1927: options.hash_known_hosts, 0,
1928: options.fingerprint_hash)) != 0)
1929: error("%s: hostfile_replace_entries failed: %s",
1930: __func__, ssh_err(r));
1931: }
1932:
1933: static void
1.303 djm 1934: client_global_hostkeys_private_confirm(struct ssh *ssh, int type,
1935: u_int32_t seq, void *_ctx)
1.269 djm 1936: {
1937: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1938: size_t i, ndone;
1939: struct sshbuf *signdata;
1.309 djm 1940: int r, kexsigtype, use_kexsigtype;
1.269 djm 1941: const u_char *sig;
1942: size_t siglen;
1943:
1944: if (ctx->nnew == 0)
1945: fatal("%s: ctx->nnew == 0", __func__); /* sanity */
1946: if (type != SSH2_MSG_REQUEST_SUCCESS) {
1947: error("Server failed to confirm ownership of "
1948: "private host keys");
1949: hostkeys_update_ctx_free(ctx);
1950: return;
1951: }
1.309 djm 1952: kexsigtype = sshkey_type_plain(
1953: sshkey_type_from_name(ssh->kex->hostkey_alg));
1954:
1.269 djm 1955: if ((signdata = sshbuf_new()) == NULL)
1956: fatal("%s: sshbuf_new failed", __func__);
1957: /* Don't want to accidentally accept an unbound signature */
1958: if (ssh->kex->session_id_len == 0)
1959: fatal("%s: ssh->kex->session_id_len == 0", __func__);
1960: /*
1961: * Expect a signature for each of the ctx->nnew private keys we
1962: * haven't seen before. They will be in the same order as the
1963: * ctx->keys where the corresponding ctx->keys_seen[i] == 0.
1964: */
1965: for (ndone = i = 0; i < ctx->nkeys; i++) {
1966: if (ctx->keys_seen[i])
1967: continue;
1968: /* Prepare data to be signed: session ID, unique string, key */
1969: sshbuf_reset(signdata);
1.270 djm 1970: if ( (r = sshbuf_put_cstring(signdata,
1971: "hostkeys-prove-00@openssh.com")) != 0 ||
1972: (r = sshbuf_put_string(signdata, ssh->kex->session_id,
1.269 djm 1973: ssh->kex->session_id_len)) != 0 ||
1974: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1975: fatal("%s: failed to prepare signature: %s",
1976: __func__, ssh_err(r));
1977: /* Extract and verify signature */
1978: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1979: error("%s: couldn't parse message: %s",
1980: __func__, ssh_err(r));
1981: goto out;
1982: }
1.309 djm 1983: /*
1984: * For RSA keys, prefer to use the signature type negotiated
1985: * during KEX to the default (SHA1).
1986: */
1987: use_kexsigtype = kexsigtype == KEY_RSA &&
1988: sshkey_type_plain(ctx->keys[i]->type) == KEY_RSA;
1.269 djm 1989: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 1990: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.309 djm 1991: use_kexsigtype ? ssh->kex->hostkey_alg : NULL, 0)) != 0) {
1.269 djm 1992: error("%s: server gave bad signature for %s key %zu",
1993: __func__, sshkey_type(ctx->keys[i]), i);
1994: goto out;
1995: }
1996: /* Key is good. Mark it as 'seen' */
1997: ctx->keys_seen[i] = 2;
1998: ndone++;
1999: }
2000: if (ndone != ctx->nnew)
2001: fatal("%s: ndone != ctx->nnew (%zu / %zu)", __func__,
2002: ndone, ctx->nnew); /* Shouldn't happen */
1.320 djm 2003: if ((r = sshpkt_get_end(ssh)) != 0) {
2004: error("%s: protocol error", __func__);
2005: goto out;
2006: }
1.269 djm 2007:
2008: /* Make the edits to known_hosts */
2009: update_known_hosts(ctx);
2010: out:
2011: hostkeys_update_ctx_free(ctx);
2012: }
2013:
1.267 djm 2014: /*
1.291 djm 2015: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
2016: * Made slightly less trivial by the multiple RSA signature algorithm names.
2017: */
2018: static int
2019: key_accepted_by_hostkeyalgs(const struct sshkey *key)
2020: {
2021: const char *ktype = sshkey_ssh_name(key);
2022: const char *hostkeyalgs = options.hostkeyalgorithms != NULL ?
2023: options.hostkeyalgorithms : KEX_DEFAULT_PK_ALG;
2024:
2025: if (key == NULL || key->type == KEY_UNSPEC)
2026: return 0;
2027: if (key->type == KEY_RSA &&
2028: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
2029: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
2030: return 1;
2031: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
2032: }
2033:
2034: /*
1.270 djm 2035: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2036: * the server's hostkeys. The keys are checked against the user's
2037: * HostkeyAlgorithms preference before they are accepted.
2038: */
2039: static int
1.321 djm 2040: client_input_hostkeys(struct ssh *ssh)
1.267 djm 2041: {
2042: const u_char *blob = NULL;
1.269 djm 2043: size_t i, len = 0;
1.267 djm 2044: struct sshbuf *buf = NULL;
1.269 djm 2045: struct sshkey *key = NULL, **tmp;
2046: int r;
2047: char *fp;
1.267 djm 2048: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2049: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2050: struct hostkeys_update_ctx *ctx = NULL;
1.267 djm 2051:
2052: if (hostkeys_seen)
2053: fatal("%s: server already sent hostkeys", __func__);
1.269 djm 2054: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2055: options.batch_mode)
2056: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2057: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2058: return 1;
1.272 djm 2059:
2060: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2061: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2062: sshkey_free(key);
2063: key = NULL;
1.269 djm 2064: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
2065: error("%s: couldn't parse message: %s",
2066: __func__, ssh_err(r));
2067: goto out;
2068: }
1.270 djm 2069: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
2070: error("%s: parse key: %s", __func__, ssh_err(r));
2071: goto out;
2072: }
1.267 djm 2073: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2074: SSH_FP_DEFAULT);
2075: debug3("%s: received %s key %s", __func__,
2076: sshkey_type(key), fp);
2077: free(fp);
1.275 markus 2078:
1.291 djm 2079: if (!key_accepted_by_hostkeyalgs(key)) {
1.267 djm 2080: debug3("%s: %s key not permitted by HostkeyAlgorithms",
2081: __func__, sshkey_ssh_name(key));
2082: continue;
2083: }
1.269 djm 2084: /* Skip certs */
2085: if (sshkey_is_cert(key)) {
2086: debug3("%s: %s key is a certificate; skipping",
2087: __func__, sshkey_ssh_name(key));
2088: continue;
2089: }
2090: /* Ensure keys are unique */
2091: for (i = 0; i < ctx->nkeys; i++) {
2092: if (sshkey_equal(key, ctx->keys[i])) {
2093: error("%s: received duplicated %s host key",
2094: __func__, sshkey_ssh_name(key));
2095: goto out;
2096: }
2097: }
2098: /* Key is good, record it */
1.299 deraadt 2099: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2100: sizeof(*ctx->keys))) == NULL)
1.299 deraadt 2101: fatal("%s: recallocarray failed nkeys = %zu",
1.269 djm 2102: __func__, ctx->nkeys);
2103: ctx->keys = tmp;
2104: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2105: key = NULL;
2106: }
2107:
1.269 djm 2108: if (ctx->nkeys == 0) {
1.270 djm 2109: debug("%s: server sent no hostkeys", __func__);
1.267 djm 2110: goto out;
2111: }
1.270 djm 2112:
1.269 djm 2113: if ((ctx->keys_seen = calloc(ctx->nkeys,
2114: sizeof(*ctx->keys_seen))) == NULL)
2115: fatal("%s: calloc failed", __func__);
1.267 djm 2116:
1.268 djm 2117: get_hostfile_hostname_ipaddr(host,
2118: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2119: options.port, &ctx->host_str,
2120: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2121:
1.269 djm 2122: /* Find which keys we already know about. */
2123: if ((r = hostkeys_foreach(options.user_hostfiles[0], hostkeys_find,
2124: ctx, ctx->host_str, ctx->ip_str,
2125: HKF_WANT_PARSE_KEY|HKF_WANT_MATCH)) != 0) {
2126: error("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1.267 djm 2127: goto out;
2128: }
2129:
1.269 djm 2130: /* Figure out if we have any new keys to add */
2131: ctx->nnew = 0;
2132: for (i = 0; i < ctx->nkeys; i++) {
2133: if (!ctx->keys_seen[i])
2134: ctx->nnew++;
2135: }
2136:
2137: debug3("%s: %zu keys from server: %zu new, %zu retained. %zu to remove",
2138: __func__, ctx->nkeys, ctx->nnew, ctx->nkeys - ctx->nnew, ctx->nold);
2139:
2140: if (ctx->nnew == 0 && ctx->nold != 0) {
2141: /* We have some keys to remove. Just do it. */
2142: update_known_hosts(ctx);
2143: } else if (ctx->nnew != 0) {
2144: /*
2145: * We have received hitherto-unseen keys from the server.
2146: * Ask the server to confirm ownership of the private halves.
2147: */
2148: debug3("%s: asking server to prove ownership for %zu keys",
2149: __func__, ctx->nnew);
2150: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2151: (r = sshpkt_put_cstring(ssh,
1.270 djm 2152: "hostkeys-prove-00@openssh.com")) != 0 ||
1.269 djm 2153: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
2154: fatal("%s: cannot prepare packet: %s",
2155: __func__, ssh_err(r));
2156: if ((buf = sshbuf_new()) == NULL)
2157: fatal("%s: sshbuf_new", __func__);
2158: for (i = 0; i < ctx->nkeys; i++) {
2159: if (ctx->keys_seen[i])
2160: continue;
2161: sshbuf_reset(buf);
2162: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0)
2163: fatal("%s: sshkey_putb: %s",
2164: __func__, ssh_err(r));
2165: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
2166: fatal("%s: sshpkt_put_string: %s",
2167: __func__, ssh_err(r));
2168: }
2169: if ((r = sshpkt_send(ssh)) != 0)
2170: fatal("%s: sshpkt_send: %s", __func__, ssh_err(r));
2171: client_register_global_confirm(
2172: client_global_hostkeys_private_confirm, ctx);
2173: ctx = NULL; /* will be freed in callback */
2174: }
2175:
1.267 djm 2176: /* Success */
2177: out:
1.269 djm 2178: hostkeys_update_ctx_free(ctx);
1.267 djm 2179: sshkey_free(key);
2180: sshbuf_free(buf);
1.269 djm 2181: /*
2182: * NB. Return success for all cases. The server doesn't need to know
2183: * what the client does with its hosts file.
2184: */
2185: return 1;
1.267 djm 2186: }
2187:
1.264 markus 2188: static int
1.297 markus 2189: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2190: {
2191: char *rtype;
1.320 djm 2192: u_char want_reply;
2193: int r, success = 0;
1.95 markus 2194:
1.320 djm 2195: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
2196: (r = sshpkt_get_u8(ssh, &want_reply)) != 0)
2197: goto out;
1.117 markus 2198: debug("client_input_global_request: rtype %s want_reply %d",
2199: rtype, want_reply);
1.270 djm 2200: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.321 djm 2201: success = client_input_hostkeys(ssh);
1.95 markus 2202: if (want_reply) {
1.320 djm 2203: if ((r = sshpkt_start(ssh, success ? SSH2_MSG_REQUEST_SUCCESS :
2204: SSH2_MSG_REQUEST_FAILURE)) != 0 ||
2205: (r = sshpkt_send(ssh)) != 0 ||
2206: (r = ssh_packet_write_wait(ssh)) != 0)
2207: goto out;
1.95 markus 2208: }
1.320 djm 2209: r = 0;
2210: out:
1.250 djm 2211: free(rtype);
1.320 djm 2212: return r;
1.95 markus 2213: }
1.22 markus 2214:
1.123 djm 2215: void
1.303 djm 2216: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.315 markus 2217: const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd,
2218: char **env)
1.123 djm 2219: {
1.320 djm 2220: int i, j, matched, len, r;
1.313 djm 2221: char *name, *val;
1.132 djm 2222: Channel *c = NULL;
1.123 djm 2223:
2224: debug2("%s: id %d", __func__, id);
2225:
1.303 djm 2226: if ((c = channel_lookup(ssh, id)) == NULL)
2227: fatal("%s: channel %d: unknown channel", __func__, id);
1.224 djm 2228:
1.320 djm 2229: ssh_packet_set_interactive(ssh, want_tty,
1.224 djm 2230: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2231:
1.123 djm 2232: if (want_tty) {
2233: struct winsize ws;
2234:
2235: /* Store window size in the packet. */
2236: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2237: memset(&ws, 0, sizeof(ws));
2238:
1.303 djm 2239: channel_request_start(ssh, id, "pty-req", 1);
2240: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.320 djm 2241: if ((r = sshpkt_put_cstring(ssh, term != NULL ? term : ""))
2242: != 0 ||
2243: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
2244: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
2245: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
2246: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0)
1.322 djm 2247: fatal("%s: build packet: %s", __func__, ssh_err(r));
1.194 djm 2248: if (tiop == NULL)
2249: tiop = get_saved_tio();
1.316 markus 2250: ssh_tty_make_modes(ssh, -1, tiop);
1.320 djm 2251: if ((r = sshpkt_send(ssh)) != 0)
1.322 djm 2252: fatal("%s: send packet: %s", __func__, ssh_err(r));
1.123 djm 2253: /* XXX wait for reply */
1.132 djm 2254: c->client_tty = 1;
1.123 djm 2255: }
2256:
2257: /* Transfer any environment variables from client to server */
1.126 djm 2258: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2259: debug("Sending environment.");
1.126 djm 2260: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2261: /* Split */
1.126 djm 2262: name = xstrdup(env[i]);
1.123 djm 2263: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2264: free(name);
1.123 djm 2265: continue;
2266: }
2267: *val++ = '\0';
2268:
2269: matched = 0;
2270: for (j = 0; j < options.num_send_env; j++) {
2271: if (match_pattern(name, options.send_env[j])) {
2272: matched = 1;
2273: break;
2274: }
2275: }
2276: if (!matched) {
2277: debug3("Ignored env %s", name);
1.250 djm 2278: free(name);
1.123 djm 2279: continue;
2280: }
2281:
2282: debug("Sending env %s = %s", name, val);
1.303 djm 2283: channel_request_start(ssh, id, "env", 0);
1.320 djm 2284: if ((r = sshpkt_put_cstring(ssh, name)) != 0 ||
2285: (r = sshpkt_put_cstring(ssh, val)) != 0 ||
1.322 djm 2286: (r = sshpkt_send(ssh)) != 0) {
2287: fatal("%s: send packet: %s",
2288: __func__, ssh_err(r));
2289: }
1.250 djm 2290: free(name);
1.123 djm 2291: }
1.313 djm 2292: }
2293: for (i = 0; i < options.num_setenv; i++) {
2294: /* Split */
2295: name = xstrdup(options.setenv[i]);
2296: if ((val = strchr(name, '=')) == NULL) {
2297: free(name);
2298: continue;
2299: }
2300: *val++ = '\0';
2301:
2302: debug("Setting env %s = %s", name, val);
2303: channel_request_start(ssh, id, "env", 0);
1.320 djm 2304: if ((r = sshpkt_put_cstring(ssh, name)) != 0 ||
2305: (r = sshpkt_put_cstring(ssh, val)) != 0 ||
2306: (r = sshpkt_send(ssh)) != 0)
1.322 djm 2307: fatal("%s: send packet: %s", __func__, ssh_err(r));
1.313 djm 2308: free(name);
1.123 djm 2309: }
2310:
1.315 markus 2311: len = sshbuf_len(cmd);
1.123 djm 2312: if (len > 0) {
2313: if (len > 900)
2314: len = 900;
2315: if (want_subsystem) {
1.190 djm 2316: debug("Sending subsystem: %.*s",
1.315 markus 2317: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2318: channel_request_start(ssh, id, "subsystem", 1);
2319: client_expect_confirm(ssh, id, "subsystem",
2320: CONFIRM_CLOSE);
1.123 djm 2321: } else {
1.190 djm 2322: debug("Sending command: %.*s",
1.315 markus 2323: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2324: channel_request_start(ssh, id, "exec", 1);
2325: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2326: }
1.320 djm 2327: if ((r = sshpkt_put_stringb(ssh, cmd)) != 0 ||
2328: (r = sshpkt_send(ssh)) != 0)
1.322 djm 2329: fatal("%s: send command: %s", __func__, ssh_err(r));
1.123 djm 2330: } else {
1.303 djm 2331: channel_request_start(ssh, id, "shell", 1);
2332: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.322 djm 2333: if ((r = sshpkt_send(ssh)) != 0) {
2334: fatal("%s: send shell request: %s",
2335: __func__, ssh_err(r));
2336: }
1.123 djm 2337: }
2338: }
2339:
1.77 itojun 2340: static void
1.321 djm 2341: client_init_dispatch(struct ssh *ssh)
1.16 markus 2342: {
1.321 djm 2343: ssh_dispatch_init(ssh, &dispatch_protocol_error);
1.100 markus 2344:
1.321 djm 2345: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2346: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2347: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2348: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2349: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2350: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2351: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2352: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2353: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2354: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2355: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2356: ssh_dispatch_set(ssh, SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2357:
2358: /* rekeying */
1.321 djm 2359: ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2360:
2361: /* global request reply messages */
1.321 djm 2362: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2363: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2364: }
2365:
2366: void
2367: client_stop_mux(void)
2368: {
2369: if (options.control_path != NULL && muxserver_sock != -1)
2370: unlink(options.control_path);
2371: /*
1.247 dtucker 2372: * If we are in persist mode, or don't have a shell, signal that we
2373: * should close when all active channels are closed.
1.232 djm 2374: */
1.247 dtucker 2375: if (options.control_persist || no_shell_flag) {
1.232 djm 2376: session_closed = 1;
1.235 djm 2377: setproctitle("[stopped mux]");
2378: }
1.113 markus 2379: }
2380:
2381: /* client specific fatal cleanup */
2382: void
1.114 markus 2383: cleanup_exit(int i)
1.113 markus 2384: {
1.233 djm 2385: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2386: leave_non_blocking();
1.192 djm 2387: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2388: unlink(options.control_path);
1.223 djm 2389: ssh_kill_proxy_command();
1.114 markus 2390: _exit(i);
1.1 deraadt 2391: }
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