Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.233
1.233 ! djm 1: /* $OpenBSD: clientloop.c,v 1.232 2011/04/17 22:42:41 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>
1.172 stevesk 68: #include <sys/param.h>
1.189 djm 69: #include <sys/queue.h>
1.150 stevesk 70:
1.155 stevesk 71: #include <ctype.h>
1.168 stevesk 72: #include <errno.h>
1.151 stevesk 73: #include <paths.h>
1.153 stevesk 74: #include <signal.h>
1.174 stevesk 75: #include <stdio.h>
1.173 stevesk 76: #include <stdlib.h>
1.170 stevesk 77: #include <string.h>
1.150 stevesk 78: #include <termios.h>
1.175 deraadt 79: #include <pwd.h>
1.169 stevesk 80: #include <unistd.h>
1.1 deraadt 81:
1.175 deraadt 82: #include "xmalloc.h"
1.45 markus 83: #include "ssh.h"
84: #include "ssh1.h"
85: #include "ssh2.h"
1.1 deraadt 86: #include "packet.h"
87: #include "buffer.h"
1.15 markus 88: #include "compat.h"
1.74 markus 89: #include "channels.h"
1.15 markus 90: #include "dispatch.h"
1.40 markus 91: #include "key.h"
1.175 deraadt 92: #include "cipher.h"
1.54 markus 93: #include "kex.h"
1.45 markus 94: #include "log.h"
95: #include "readconf.h"
96: #include "clientloop.h"
1.147 djm 97: #include "sshconnect.h"
1.40 markus 98: #include "authfd.h"
1.45 markus 99: #include "atomicio.h"
1.118 deraadt 100: #include "sshpty.h"
1.63 markus 101: #include "misc.h"
1.123 djm 102: #include "match.h"
103: #include "msg.h"
1.212 andreas 104: #include "roaming.h"
1.39 markus 105:
106: /* import options */
107: extern Options options;
108:
1.1 deraadt 109: /* Flag indicating that stdin should be redirected from /dev/null. */
110: extern int stdin_null_flag;
111:
1.116 dtucker 112: /* Flag indicating that no shell has been requested */
113: extern int no_shell_flag;
114:
1.123 djm 115: /* Control socket */
1.217 djm 116: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 117:
1.13 markus 118: /*
119: * Name of the host we are connecting to. This is the name given on the
120: * command line, or the HostName specified for the user-supplied name in a
121: * configuration file.
122: */
1.1 deraadt 123: extern char *host;
124:
1.13 markus 125: /*
126: * Flag to indicate that we have received a window change signal which has
127: * not yet been processed. This will cause a message indicating the new
128: * window size to be sent to the server a little later. This is volatile
129: * because this is updated in a signal handler.
130: */
1.88 markus 131: static volatile sig_atomic_t received_window_change_signal = 0;
132: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 133:
1.145 djm 134: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 135: static int in_non_blocking_mode = 0;
136:
1.222 djm 137: /* Time when backgrounded control master using ControlPersist should exit */
138: static time_t control_persist_exit_time = 0;
139:
1.1 deraadt 140: /* Common data for the client loop code. */
1.217 djm 141: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.195 djm 142: static int escape_char1; /* Escape character. (proto1 only) */
143: static int escape_pending1; /* Last character was an escape (proto1 only) */
1.11 markus 144: static int last_was_cr; /* Last character was a newline. */
1.197 djm 145: static int exit_status; /* Used to store the command exit status. */
146: static int stdin_eof; /* EOF has been encountered on stderr. */
1.11 markus 147: static Buffer stdin_buffer; /* Buffer for stdin data. */
148: static Buffer stdout_buffer; /* Buffer for stdout data. */
149: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.221 djm 150: static u_int buffer_high; /* Soft max buffer size. */
1.11 markus 151: static int connection_in; /* Connection to server (input). */
152: static int connection_out; /* Connection to server (output). */
1.56 markus 153: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 154: static int session_closed; /* In SSH2: login session closed. */
155: static int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.1 deraadt 156:
1.77 itojun 157: static void client_init_dispatch(void);
1.16 markus 158: int session_ident = -1;
159:
1.214 andreas 160: int session_resumed = 0;
161:
1.195 djm 162: /* Track escape per proto2 channel */
163: struct escape_filter_ctx {
164: int escape_pending;
165: int escape_char;
166: };
167:
168: /* Context for channel confirmation replies */
1.190 djm 169: struct channel_reply_ctx {
170: const char *request_type;
171: int id, do_close;
172: };
173:
1.196 djm 174: /* Global request success/failure callbacks */
175: struct global_confirm {
176: TAILQ_ENTRY(global_confirm) entry;
177: global_confirm_cb *cb;
178: void *ctx;
179: int ref_count;
180: };
181: TAILQ_HEAD(global_confirms, global_confirm);
182: static struct global_confirms global_confirms =
183: TAILQ_HEAD_INITIALIZER(global_confirms);
184:
1.54 markus 185: /*XXX*/
186: extern Kex *xxx_kex;
187:
1.123 djm 188: void ssh_process_session2_setup(int, int, int, Buffer *);
189:
1.1 deraadt 190: /* Restores stdin to blocking mode. */
191:
1.77 itojun 192: static void
1.49 itojun 193: leave_non_blocking(void)
1.1 deraadt 194: {
1.11 markus 195: if (in_non_blocking_mode) {
1.125 djm 196: unset_nonblock(fileno(stdin));
1.11 markus 197: in_non_blocking_mode = 0;
198: }
1.1 deraadt 199: }
200:
1.11 markus 201: /* Puts stdin terminal in non-blocking mode. */
202:
1.77 itojun 203: static void
1.49 itojun 204: enter_non_blocking(void)
1.1 deraadt 205: {
1.11 markus 206: in_non_blocking_mode = 1;
1.124 djm 207: set_nonblock(fileno(stdin));
1.1 deraadt 208: }
209:
1.13 markus 210: /*
211: * Signal handler for the window change signal (SIGWINCH). This just sets a
212: * flag indicating that the window has changed.
213: */
1.157 deraadt 214: /*ARGSUSED */
1.77 itojun 215: static void
1.11 markus 216: window_change_handler(int sig)
1.1 deraadt 217: {
1.11 markus 218: received_window_change_signal = 1;
219: signal(SIGWINCH, window_change_handler);
1.1 deraadt 220: }
221:
1.13 markus 222: /*
223: * Signal handler for signals that cause the program to terminate. These
224: * signals must be trapped to restore terminal modes.
225: */
1.157 deraadt 226: /*ARGSUSED */
1.77 itojun 227: static void
1.11 markus 228: signal_handler(int sig)
1.1 deraadt 229: {
1.75 markus 230: received_signal = sig;
231: quit_pending = 1;
1.1 deraadt 232: }
233:
1.13 markus 234: /*
235: * Returns current time in seconds from Jan 1, 1970 with the maximum
236: * available resolution.
237: */
1.1 deraadt 238:
1.77 itojun 239: static double
1.49 itojun 240: get_current_time(void)
1.1 deraadt 241: {
1.11 markus 242: struct timeval tv;
243: gettimeofday(&tv, NULL);
244: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 245: }
246:
1.222 djm 247: /*
248: * Sets control_persist_exit_time to the absolute time when the
249: * backgrounded control master should exit due to expiry of the
250: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
251: * control master process, or if there is no ControlPersist timeout.
252: */
253: static void
254: set_control_persist_exit_time(void)
255: {
256: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 257: || options.control_persist_timeout == 0) {
1.222 djm 258: /* not using a ControlPersist timeout */
259: control_persist_exit_time = 0;
1.232 djm 260: } else if (channel_still_open()) {
1.222 djm 261: /* some client connections are still open */
262: if (control_persist_exit_time > 0)
263: debug2("%s: cancel scheduled exit", __func__);
264: control_persist_exit_time = 0;
265: } else if (control_persist_exit_time <= 0) {
266: /* a client connection has recently closed */
267: control_persist_exit_time = time(NULL) +
268: (time_t)options.control_persist_timeout;
269: debug2("%s: schedule exit in %d seconds", __func__,
270: options.control_persist_timeout);
271: }
272: /* else we are already counting down to the timeout */
273: }
274:
1.138 djm 275: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
276: void
277: client_x11_get_proto(const char *display, const char *xauth_path,
1.221 djm 278: u_int trusted, u_int timeout, char **_proto, char **_data)
1.138 djm 279: {
280: char cmd[1024];
281: char line[512];
282: char xdisplay[512];
283: static char proto[512], data[512];
284: FILE *f;
285: int got_data = 0, generated = 0, do_unlink = 0, i;
286: char *xauthdir, *xauthfile;
287: struct stat st;
1.221 djm 288: u_int now;
1.138 djm 289:
290: xauthdir = xauthfile = NULL;
291: *_proto = proto;
292: *_data = data;
293: proto[0] = data[0] = '\0';
294:
295: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
296: debug("No xauth program.");
297: } else {
298: if (display == NULL) {
299: debug("x11_get_proto: DISPLAY not set");
300: return;
301: }
302: /*
303: * Handle FamilyLocal case where $DISPLAY does
304: * not match an authorization entry. For this we
305: * just try "xauth list unix:displaynum.screennum".
306: * XXX: "localhost" match to determine FamilyLocal
307: * is not perfect.
308: */
309: if (strncmp(display, "localhost:", 10) == 0) {
310: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
311: display + 10);
312: display = xdisplay;
313: }
314: if (trusted == 0) {
315: xauthdir = xmalloc(MAXPATHLEN);
316: xauthfile = xmalloc(MAXPATHLEN);
1.225 djm 317: mktemp_proto(xauthdir, MAXPATHLEN);
1.138 djm 318: if (mkdtemp(xauthdir) != NULL) {
319: do_unlink = 1;
320: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
321: xauthdir);
322: snprintf(cmd, sizeof(cmd),
323: "%s -f %s generate %s " SSH_X11_PROTO
1.221 djm 324: " untrusted timeout %u 2>" _PATH_DEVNULL,
325: xauth_path, xauthfile, display, timeout);
1.138 djm 326: debug2("x11_get_proto: %s", cmd);
327: if (system(cmd) == 0)
328: generated = 1;
1.221 djm 329: if (x11_refuse_time == 0) {
330: now = time(NULL) + 1;
331: if (UINT_MAX - timeout < now)
332: x11_refuse_time = UINT_MAX;
333: else
334: x11_refuse_time = now + timeout;
335: }
1.138 djm 336: }
337: }
1.181 markus 338:
339: /*
340: * When in untrusted mode, we read the cookie only if it was
341: * successfully generated as an untrusted one in the step
342: * above.
343: */
344: if (trusted || generated) {
345: snprintf(cmd, sizeof(cmd),
346: "%s %s%s list %s 2>" _PATH_DEVNULL,
347: xauth_path,
348: generated ? "-f " : "" ,
349: generated ? xauthfile : "",
350: display);
351: debug2("x11_get_proto: %s", cmd);
352: f = popen(cmd, "r");
353: if (f && fgets(line, sizeof(line), f) &&
354: sscanf(line, "%*s %511s %511s", proto, data) == 2)
355: got_data = 1;
356: if (f)
357: pclose(f);
358: } else
359: error("Warning: untrusted X11 forwarding setup failed: "
360: "xauth key data not generated");
1.138 djm 361: }
362:
363: if (do_unlink) {
364: unlink(xauthfile);
365: rmdir(xauthdir);
366: }
367: if (xauthdir)
368: xfree(xauthdir);
369: if (xauthfile)
370: xfree(xauthfile);
371:
372: /*
373: * If we didn't get authentication data, just make up some
374: * data. The forwarding code will check the validity of the
375: * response anyway, and substitute this data. The X11
376: * server, however, will ignore this fake data and use
377: * whatever authentication mechanisms it was using otherwise
378: * for the local connection.
379: */
380: if (!got_data) {
381: u_int32_t rnd = 0;
382:
383: logit("Warning: No xauth data; "
384: "using fake authentication data for X11 forwarding.");
385: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
386: for (i = 0; i < 16; i++) {
387: if (i % 4 == 0)
388: rnd = arc4random();
389: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
390: rnd & 0xff);
391: rnd >>= 8;
392: }
393: }
1.1 deraadt 394: }
395:
1.13 markus 396: /*
397: * This is called when the interactive is entered. This checks if there is
398: * an EOF coming on stdin. We must check this explicitly, as select() does
399: * not appear to wake up when redirecting from /dev/null.
400: */
1.1 deraadt 401:
1.77 itojun 402: static void
1.49 itojun 403: client_check_initial_eof_on_stdin(void)
1.1 deraadt 404: {
1.11 markus 405: int len;
406: char buf[1];
1.1 deraadt 407:
1.13 markus 408: /*
409: * If standard input is to be "redirected from /dev/null", we simply
410: * mark that we have seen an EOF and send an EOF message to the
411: * server. Otherwise, we try to read a single character; it appears
412: * that for some files, such /dev/null, select() never wakes up for
413: * read for this descriptor, which means that we never get EOF. This
414: * way we will get the EOF if stdin comes from /dev/null or similar.
415: */
1.11 markus 416: if (stdin_null_flag) {
417: /* Fake EOF on stdin. */
418: debug("Sending eof.");
419: stdin_eof = 1;
420: packet_start(SSH_CMSG_EOF);
421: packet_send();
422: } else {
423: enter_non_blocking();
424:
425: /* Check for immediate EOF on stdin. */
426: len = read(fileno(stdin), buf, 1);
427: if (len == 0) {
1.197 djm 428: /*
429: * EOF. Record that we have seen it and send
430: * EOF to server.
431: */
1.11 markus 432: debug("Sending eof.");
433: stdin_eof = 1;
434: packet_start(SSH_CMSG_EOF);
435: packet_send();
436: } else if (len > 0) {
1.13 markus 437: /*
438: * Got data. We must store the data in the buffer,
439: * and also process it as an escape character if
440: * appropriate.
441: */
1.195 djm 442: if ((u_char) buf[0] == escape_char1)
443: escape_pending1 = 1;
1.52 markus 444: else
1.11 markus 445: buffer_append(&stdin_buffer, buf, 1);
446: }
447: leave_non_blocking();
448: }
1.1 deraadt 449: }
450:
451:
1.13 markus 452: /*
453: * Make packets from buffered stdin data, and buffer them for sending to the
454: * connection.
455: */
1.1 deraadt 456:
1.77 itojun 457: static void
1.49 itojun 458: client_make_packets_from_stdin_data(void)
1.1 deraadt 459: {
1.42 markus 460: u_int len;
1.1 deraadt 461:
1.11 markus 462: /* Send buffered stdin data to the server. */
463: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 464: packet_not_very_much_data_to_write()) {
1.11 markus 465: len = buffer_len(&stdin_buffer);
466: /* Keep the packets at reasonable size. */
467: if (len > packet_get_maxsize())
468: len = packet_get_maxsize();
469: packet_start(SSH_CMSG_STDIN_DATA);
470: packet_put_string(buffer_ptr(&stdin_buffer), len);
471: packet_send();
472: buffer_consume(&stdin_buffer, len);
473: /* If we have a pending EOF, send it now. */
474: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
475: packet_start(SSH_CMSG_EOF);
476: packet_send();
477: }
1.1 deraadt 478: }
479: }
480:
1.13 markus 481: /*
482: * Checks if the client window has changed, and sends a packet about it to
483: * the server if so. The actual change is detected elsewhere (by a software
484: * interrupt on Unix); this just checks the flag and sends a message if
485: * appropriate.
486: */
1.1 deraadt 487:
1.77 itojun 488: static void
1.49 itojun 489: client_check_window_change(void)
1.1 deraadt 490: {
1.16 markus 491: struct winsize ws;
492:
493: if (! received_window_change_signal)
494: return;
495: /** XXX race */
496: received_window_change_signal = 0;
497:
1.37 markus 498: debug2("client_check_window_change: changed");
1.16 markus 499:
500: if (compat20) {
1.123 djm 501: channel_send_window_changes();
1.16 markus 502: } else {
1.123 djm 503: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
504: return;
1.16 markus 505: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 506: packet_put_int((u_int)ws.ws_row);
507: packet_put_int((u_int)ws.ws_col);
508: packet_put_int((u_int)ws.ws_xpixel);
509: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 510: packet_send();
1.1 deraadt 511: }
512: }
513:
1.117 markus 514: static void
515: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
516: {
1.196 djm 517: struct global_confirm *gc;
518:
519: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
520: return;
521: if (gc->cb != NULL)
522: gc->cb(type, seq, gc->ctx);
523: if (--gc->ref_count <= 0) {
524: TAILQ_REMOVE(&global_confirms, gc, entry);
525: bzero(gc, sizeof(*gc));
526: xfree(gc);
527: }
528:
1.210 andreas 529: packet_set_alive_timeouts(0);
1.117 markus 530: }
531:
532: static void
533: server_alive_check(void)
534: {
1.210 andreas 535: if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
1.228 djm 536: logit("Timeout, server %s not responding.", host);
1.176 markus 537: cleanup_exit(255);
538: }
1.117 markus 539: packet_start(SSH2_MSG_GLOBAL_REQUEST);
540: packet_put_cstring("keepalive@openssh.com");
541: packet_put_char(1); /* boolean: want reply */
542: packet_send();
1.196 djm 543: /* Insert an empty placeholder to maintain ordering */
544: client_register_global_confirm(NULL, NULL);
1.117 markus 545: }
546:
1.13 markus 547: /*
548: * Waits until the client can do something (some data becomes available on
549: * one of the file descriptors).
550: */
1.77 itojun 551: static void
1.46 markus 552: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 553: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 554: {
1.117 markus 555: struct timeval tv, *tvp;
1.222 djm 556: int timeout_secs;
1.117 markus 557: int ret;
558:
1.46 markus 559: /* Add any selections by the channel mechanism. */
1.81 markus 560: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 561:
1.16 markus 562: if (!compat20) {
1.17 markus 563: /* Read from the connection, unless our buffers are full. */
1.16 markus 564: if (buffer_len(&stdout_buffer) < buffer_high &&
565: buffer_len(&stderr_buffer) < buffer_high &&
566: channel_not_very_much_buffered_data())
1.46 markus 567: FD_SET(connection_in, *readsetp);
1.17 markus 568: /*
569: * Read from stdin, unless we have seen EOF or have very much
570: * buffered data to send to the server.
571: */
572: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 573: FD_SET(fileno(stdin), *readsetp);
1.17 markus 574:
575: /* Select stdout/stderr if have data in buffer. */
576: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 577: FD_SET(fileno(stdout), *writesetp);
1.17 markus 578: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 579: FD_SET(fileno(stderr), *writesetp);
1.16 markus 580: } else {
1.71 markus 581: /* channel_prepare_select could have closed the last channel */
1.84 markus 582: if (session_closed && !channel_still_open() &&
583: !packet_have_data_to_write()) {
584: /* clear mask since we did not call select() */
1.87 markus 585: memset(*readsetp, 0, *nallocp);
586: memset(*writesetp, 0, *nallocp);
1.84 markus 587: return;
1.71 markus 588: } else {
589: FD_SET(connection_in, *readsetp);
590: }
1.16 markus 591: }
1.11 markus 592:
593: /* Select server connection if have data to write to the server. */
594: if (packet_have_data_to_write())
1.46 markus 595: FD_SET(connection_out, *writesetp);
1.11 markus 596:
1.13 markus 597: /*
598: * Wait for something to happen. This will suspend the process until
599: * some selected descriptor can be read, written, or has some other
1.222 djm 600: * event pending, or a timeout expires.
1.13 markus 601: */
1.11 markus 602:
1.222 djm 603: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
604: if (options.server_alive_interval > 0 && compat20)
605: timeout_secs = options.server_alive_interval;
606: set_control_persist_exit_time();
607: if (control_persist_exit_time > 0) {
608: timeout_secs = MIN(timeout_secs,
609: control_persist_exit_time - time(NULL));
610: if (timeout_secs < 0)
611: timeout_secs = 0;
612: }
613: if (timeout_secs == INT_MAX)
1.117 markus 614: tvp = NULL;
1.129 deraadt 615: else {
1.222 djm 616: tv.tv_sec = timeout_secs;
1.117 markus 617: tv.tv_usec = 0;
618: tvp = &tv;
619: }
1.222 djm 620:
1.117 markus 621: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
622: if (ret < 0) {
1.11 markus 623: char buf[100];
1.51 markus 624:
625: /*
626: * We have to clear the select masks, because we return.
627: * We have to return, because the mainloop checks for the flags
628: * set by the signal handlers.
629: */
1.87 markus 630: memset(*readsetp, 0, *nallocp);
631: memset(*writesetp, 0, *nallocp);
1.50 deraadt 632:
1.11 markus 633: if (errno == EINTR)
634: return;
635: /* Note: we might still have data in the buffers. */
636: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
637: buffer_append(&stderr_buffer, buf, strlen(buf));
638: quit_pending = 1;
1.117 markus 639: } else if (ret == 0)
640: server_alive_check();
1.11 markus 641: }
642:
1.77 itojun 643: static void
1.31 markus 644: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 645: {
1.11 markus 646: /* Flush stdout and stderr buffers. */
1.31 markus 647: if (buffer_len(bout) > 0)
1.197 djm 648: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
649: buffer_len(bout));
1.31 markus 650: if (buffer_len(berr) > 0)
1.197 djm 651: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
652: buffer_len(berr));
1.11 markus 653:
1.233 ! djm 654: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 655:
1.13 markus 656: /*
657: * Free (and clear) the buffer to reduce the amount of data that gets
658: * written to swap.
659: */
1.31 markus 660: buffer_free(bin);
661: buffer_free(bout);
662: buffer_free(berr);
1.11 markus 663:
664: /* Send the suspend signal to the program itself. */
665: kill(getpid(), SIGTSTP);
666:
1.132 djm 667: /* Reset window sizes in case they have changed */
668: received_window_change_signal = 1;
1.11 markus 669:
670: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 671: buffer_init(bin);
672: buffer_init(bout);
673: buffer_init(berr);
1.11 markus 674:
1.233 ! djm 675: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 676: }
677:
1.77 itojun 678: static void
1.161 deraadt 679: client_process_net_input(fd_set *readset)
1.11 markus 680: {
1.212 andreas 681: int len, cont = 0;
1.17 markus 682: char buf[8192];
1.11 markus 683:
1.13 markus 684: /*
685: * Read input from the server, and add any such data to the buffer of
686: * the packet subsystem.
687: */
1.11 markus 688: if (FD_ISSET(connection_in, readset)) {
689: /* Read as much as possible. */
1.212 andreas 690: len = roaming_read(connection_in, buf, sizeof(buf), &cont);
691: if (len == 0 && cont == 0) {
1.197 djm 692: /*
693: * Received EOF. The remote host has closed the
694: * connection.
695: */
696: snprintf(buf, sizeof buf,
697: "Connection to %.300s closed by remote host.\r\n",
698: host);
1.1 deraadt 699: buffer_append(&stderr_buffer, buf, strlen(buf));
700: quit_pending = 1;
701: return;
1.11 markus 702: }
1.13 markus 703: /*
704: * There is a kernel bug on Solaris that causes select to
705: * sometimes wake up even though there is no data available.
706: */
1.53 millert 707: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 708: len = 0;
709:
710: if (len < 0) {
1.197 djm 711: /*
712: * An error has encountered. Perhaps there is a
713: * network problem.
714: */
715: snprintf(buf, sizeof buf,
716: "Read from remote host %.300s: %.100s\r\n",
717: host, strerror(errno));
1.11 markus 718: buffer_append(&stderr_buffer, buf, strlen(buf));
719: quit_pending = 1;
720: return;
721: }
722: packet_process_incoming(buf, len);
723: }
1.17 markus 724: }
1.16 markus 725:
1.97 jakob 726: static void
1.190 djm 727: client_status_confirm(int type, Channel *c, void *ctx)
1.123 djm 728: {
1.190 djm 729: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
730: char errmsg[256];
731: int tochan;
732:
733: /* XXX supress on mux _client_ quietmode */
734: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 735: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 736:
737: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
738: debug2("%s request accepted on channel %d",
739: cr->request_type, c->self);
740: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
741: if (tochan) {
742: snprintf(errmsg, sizeof(errmsg),
743: "%s request failed\r\n", cr->request_type);
744: } else {
745: snprintf(errmsg, sizeof(errmsg),
746: "%s request failed on channel %d",
747: cr->request_type, c->self);
748: }
749: /* If error occurred on primary session channel, then exit */
750: if (cr->do_close && c->self == session_ident)
751: fatal("%s", errmsg);
752: /* If error occurred on mux client, append to their stderr */
753: if (tochan)
754: buffer_append(&c->extended, errmsg, strlen(errmsg));
755: else
756: error("%s", errmsg);
757: if (cr->do_close) {
758: chan_read_failed(c);
759: chan_write_failed(c);
760: }
761: }
762: xfree(cr);
763: }
764:
765: static void
766: client_abandon_status_confirm(Channel *c, void *ctx)
767: {
768: xfree(ctx);
769: }
1.129 deraadt 770:
1.190 djm 771: static void
772: client_expect_confirm(int id, const char *request, int do_close)
773: {
774: struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
1.123 djm 775:
1.190 djm 776: cr->request_type = request;
777: cr->do_close = do_close;
1.123 djm 778:
1.190 djm 779: channel_register_status_confirm(id, client_status_confirm,
780: client_abandon_status_confirm, cr);
1.196 djm 781: }
782:
783: void
784: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
785: {
1.201 djm 786: struct global_confirm *gc, *last_gc;
1.196 djm 787:
788: /* Coalesce identical callbacks */
1.201 djm 789: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
790: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
791: if (++last_gc->ref_count >= INT_MAX)
792: fatal("%s: last_gc->ref_count = %d",
793: __func__, last_gc->ref_count);
1.196 djm 794: return;
795: }
796:
797: gc = xmalloc(sizeof(*gc));
798: gc->cb = cb;
799: gc->ctx = ctx;
800: gc->ref_count = 1;
801: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 802: }
803:
804: static void
1.99 markus 805: process_cmdline(void)
1.97 jakob 806: {
807: void (*handler)(int);
1.135 djm 808: char *s, *cmd, *cancel_host;
1.121 djm 809: int delete = 0;
1.204 stevesk 810: int local = 0, remote = 0, dynamic = 0;
1.208 djm 811: int cancel_port;
1.135 djm 812: Forward fwd;
1.97 jakob 813:
1.183 djm 814: bzero(&fwd, sizeof(fwd));
815: fwd.listen_host = fwd.connect_host = NULL;
816:
1.233 ! djm 817: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 818: handler = signal(SIGINT, SIG_IGN);
1.99 markus 819: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 820: if (s == NULL)
821: goto out;
1.179 tedu 822: while (isspace(*s))
1.97 jakob 823: s++;
1.121 djm 824: if (*s == '-')
825: s++; /* Skip cmdline '-', if any */
1.120 dtucker 826: if (*s == '\0')
1.97 jakob 827: goto out;
1.121 djm 828:
1.122 djm 829: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 830: logit("Commands:");
1.164 djm 831: logit(" -L[bind_address:]port:host:hostport "
832: "Request local forward");
833: logit(" -R[bind_address:]port:host:hostport "
834: "Request remote forward");
1.204 stevesk 835: logit(" -D[bind_address:]port "
836: "Request dynamic forward");
1.165 stevesk 837: logit(" -KR[bind_address:]port "
1.164 djm 838: "Cancel remote forward");
1.146 reyk 839: if (!options.permit_local_command)
840: goto out;
1.164 djm 841: logit(" !args "
842: "Execute local command");
1.146 reyk 843: goto out;
844: }
845:
846: if (*s == '!' && options.permit_local_command) {
847: s++;
848: ssh_local_cmd(s);
1.121 djm 849: goto out;
850: }
851:
852: if (*s == 'K') {
853: delete = 1;
854: s++;
855: }
1.204 stevesk 856: if (*s == 'L')
857: local = 1;
858: else if (*s == 'R')
859: remote = 1;
860: else if (*s == 'D')
861: dynamic = 1;
862: else {
1.109 itojun 863: logit("Invalid command.");
1.97 jakob 864: goto out;
865: }
1.204 stevesk 866:
867: if ((local || dynamic) && delete) {
1.121 djm 868: logit("Not supported.");
869: goto out;
870: }
1.204 stevesk 871: if (remote && delete && !compat20) {
1.109 itojun 872: logit("Not supported for SSH protocol version 1.");
1.97 jakob 873: goto out;
874: }
1.121 djm 875:
1.179 tedu 876: while (isspace(*++s))
877: ;
1.97 jakob 878:
1.217 djm 879: /* XXX update list of forwards in options */
1.121 djm 880: if (delete) {
1.135 djm 881: cancel_port = 0;
882: cancel_host = hpdelim(&s); /* may be NULL */
883: if (s != NULL) {
884: cancel_port = a2port(s);
885: cancel_host = cleanhostname(cancel_host);
886: } else {
887: cancel_port = a2port(cancel_host);
888: cancel_host = NULL;
1.121 djm 889: }
1.208 djm 890: if (cancel_port <= 0) {
1.135 djm 891: logit("Bad forwarding close port");
1.121 djm 892: goto out;
893: }
1.135 djm 894: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 895: } else {
1.209 djm 896: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 897: logit("Bad forwarding specification.");
898: goto out;
899: }
1.204 stevesk 900: if (local || dynamic) {
1.135 djm 901: if (channel_setup_local_fwd_listener(fwd.listen_host,
902: fwd.listen_port, fwd.connect_host,
903: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 904: logit("Port forwarding failed.");
905: goto out;
906: }
1.135 djm 907: } else {
1.167 markus 908: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 909: fwd.listen_port, fwd.connect_host,
1.167 markus 910: fwd.connect_port) < 0) {
911: logit("Port forwarding failed.");
912: goto out;
913: }
1.135 djm 914: }
915:
1.121 djm 916: logit("Forwarding port.");
917: }
918:
1.97 jakob 919: out:
920: signal(SIGINT, handler);
1.233 ! djm 921: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.97 jakob 922: if (cmd)
923: xfree(cmd);
1.183 djm 924: if (fwd.listen_host != NULL)
925: xfree(fwd.listen_host);
926: if (fwd.connect_host != NULL)
927: xfree(fwd.connect_host);
1.97 jakob 928: }
929:
1.195 djm 930: /*
931: * Process the characters one by one, call with c==NULL for proto1 case.
932: */
1.77 itojun 933: static int
1.195 djm 934: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
935: char *buf, int len)
1.31 markus 936: {
1.32 markus 937: char string[1024];
1.31 markus 938: pid_t pid;
939: int bytes = 0;
1.42 markus 940: u_int i;
941: u_char ch;
1.31 markus 942: char *s;
1.195 djm 943: int *escape_pendingp, escape_char;
944: struct escape_filter_ctx *efc;
1.31 markus 945:
1.195 djm 946: if (c == NULL) {
947: escape_pendingp = &escape_pending1;
948: escape_char = escape_char1;
949: } else {
950: if (c->filter_ctx == NULL)
951: return 0;
952: efc = (struct escape_filter_ctx *)c->filter_ctx;
953: escape_pendingp = &efc->escape_pending;
954: escape_char = efc->escape_char;
955: }
956:
1.139 djm 957: if (len <= 0)
958: return (0);
959:
960: for (i = 0; i < (u_int)len; i++) {
1.31 markus 961: /* Get one character at a time. */
962: ch = buf[i];
963:
1.195 djm 964: if (*escape_pendingp) {
1.31 markus 965: /* We have previously seen an escape character. */
966: /* Clear the flag now. */
1.195 djm 967: *escape_pendingp = 0;
1.31 markus 968:
969: /* Process the escaped character. */
970: switch (ch) {
971: case '.':
972: /* Terminate the connection. */
1.195 djm 973: snprintf(string, sizeof string, "%c.\r\n",
974: escape_char);
1.32 markus 975: buffer_append(berr, string, strlen(string));
1.31 markus 976:
1.217 djm 977: if (c && c->ctl_chan != -1) {
1.195 djm 978: chan_read_failed(c);
979: chan_write_failed(c);
980: return 0;
981: } else
982: quit_pending = 1;
1.31 markus 983: return -1;
984:
985: case 'Z' - 64:
1.195 djm 986: /* XXX support this for mux clients */
1.217 djm 987: if (c && c->ctl_chan != -1) {
1.195 djm 988: noescape:
989: snprintf(string, sizeof string,
990: "%c%c escape not available to "
991: "multiplexed sessions\r\n",
992: escape_char, ch);
993: buffer_append(berr, string,
994: strlen(string));
995: continue;
996: }
1.197 djm 997: /* Suspend the program. Inform the user */
1.195 djm 998: snprintf(string, sizeof string,
999: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 1000: buffer_append(berr, string, strlen(string));
1.31 markus 1001:
1002: /* Restore terminal modes and suspend. */
1003: client_suspend_self(bin, bout, berr);
1004:
1005: /* We have been continued. */
1006: continue;
1007:
1.111 markus 1008: case 'B':
1009: if (compat20) {
1010: snprintf(string, sizeof string,
1011: "%cB\r\n", escape_char);
1012: buffer_append(berr, string,
1013: strlen(string));
1014: channel_request_start(session_ident,
1015: "break", 0);
1016: packet_put_int(1000);
1017: packet_send();
1018: }
1019: continue;
1020:
1.54 markus 1021: case 'R':
1.59 markus 1022: if (compat20) {
1023: if (datafellows & SSH_BUG_NOREKEY)
1.197 djm 1024: logit("Server does not "
1025: "support re-keying");
1.59 markus 1026: else
1027: need_rekeying = 1;
1028: }
1.54 markus 1029: continue;
1030:
1.31 markus 1031: case '&':
1.217 djm 1032: if (c && c->ctl_chan != -1)
1.195 djm 1033: goto noescape;
1.31 markus 1034: /*
1.197 djm 1035: * Detach the program (continue to serve
1036: * connections, but put in background and no
1037: * more new connections).
1.31 markus 1038: */
1039: /* Restore tty modes. */
1.233 ! djm 1040: leave_raw_mode(
! 1041: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1042:
1043: /* Stop listening for new connections. */
1.86 markus 1044: channel_stop_listening();
1.31 markus 1045:
1.86 markus 1046: snprintf(string, sizeof string,
1047: "%c& [backgrounded]\n", escape_char);
1048: buffer_append(berr, string, strlen(string));
1.31 markus 1049:
1050: /* Fork into background. */
1051: pid = fork();
1052: if (pid < 0) {
1053: error("fork: %.100s", strerror(errno));
1054: continue;
1055: }
1056: if (pid != 0) { /* This is the parent. */
1057: /* The parent just exits. */
1058: exit(0);
1059: }
1060: /* The child continues serving connections. */
1.86 markus 1061: if (compat20) {
1062: buffer_append(bin, "\004", 1);
1063: /* fake EOF on stdin */
1064: return -1;
1065: } else if (!stdin_eof) {
1066: /*
1.197 djm 1067: * Sending SSH_CMSG_EOF alone does not
1068: * always appear to be enough. So we
1069: * try to send an EOF character first.
1.86 markus 1070: */
1071: packet_start(SSH_CMSG_STDIN_DATA);
1072: packet_put_string("\004", 1);
1073: packet_send();
1074: /* Close stdin. */
1075: stdin_eof = 1;
1076: if (buffer_len(bin) == 0) {
1077: packet_start(SSH_CMSG_EOF);
1078: packet_send();
1079: }
1080: }
1081: continue;
1.31 markus 1082:
1083: case '?':
1.217 djm 1084: if (c && c->ctl_chan != -1) {
1.195 djm 1085: snprintf(string, sizeof string,
1086: "%c?\r\n\
1087: Supported escape sequences:\r\n\
1088: %c. - terminate session\r\n\
1089: %cB - send a BREAK to the remote system\r\n\
1090: %cR - Request rekey (SSH protocol 2 only)\r\n\
1091: %c# - list forwarded connections\r\n\
1092: %c? - this message\r\n\
1093: %c%c - send the escape character by typing it twice\r\n\
1094: (Note that escapes are only recognized immediately after newline.)\r\n",
1095: escape_char, escape_char,
1096: escape_char, escape_char,
1097: escape_char, escape_char,
1.206 djm 1098: escape_char, escape_char);
1.195 djm 1099: } else {
1100: snprintf(string, sizeof string,
1.31 markus 1101: "%c?\r\n\
1102: Supported escape sequences:\r\n\
1.195 djm 1103: %c. - terminate connection (and any multiplexed sessions)\r\n\
1104: %cB - send a BREAK to the remote system\r\n\
1105: %cC - open a command line\r\n\
1106: %cR - Request rekey (SSH protocol 2 only)\r\n\
1107: %c^Z - suspend ssh\r\n\
1108: %c# - list forwarded connections\r\n\
1109: %c& - background ssh (when waiting for connections to terminate)\r\n\
1110: %c? - this message\r\n\
1111: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1112: (Note that escapes are only recognized immediately after newline.)\r\n",
1.195 djm 1113: escape_char, escape_char,
1114: escape_char, escape_char,
1115: escape_char, escape_char,
1116: escape_char, escape_char,
1117: escape_char, escape_char,
1118: escape_char);
1119: }
1.32 markus 1120: buffer_append(berr, string, strlen(string));
1.31 markus 1121: continue;
1122:
1123: case '#':
1.195 djm 1124: snprintf(string, sizeof string, "%c#\r\n",
1125: escape_char);
1.32 markus 1126: buffer_append(berr, string, strlen(string));
1.31 markus 1127: s = channel_open_message();
1128: buffer_append(berr, s, strlen(s));
1129: xfree(s);
1.97 jakob 1130: continue;
1131:
1132: case 'C':
1.217 djm 1133: if (c && c->ctl_chan != -1)
1.206 djm 1134: goto noescape;
1.99 markus 1135: process_cmdline();
1.31 markus 1136: continue;
1137:
1138: default:
1139: if (ch != escape_char) {
1140: buffer_put_char(bin, escape_char);
1141: bytes++;
1142: }
1143: /* Escaped characters fall through here */
1144: break;
1145: }
1146: } else {
1147: /*
1.197 djm 1148: * The previous character was not an escape char.
1149: * Check if this is an escape.
1.31 markus 1150: */
1151: if (last_was_cr && ch == escape_char) {
1.197 djm 1152: /*
1153: * It is. Set the flag and continue to
1154: * next character.
1155: */
1.195 djm 1156: *escape_pendingp = 1;
1.31 markus 1157: continue;
1158: }
1159: }
1160:
1161: /*
1162: * Normal character. Record whether it was a newline,
1163: * and append it to the buffer.
1164: */
1165: last_was_cr = (ch == '\r' || ch == '\n');
1166: buffer_put_char(bin, ch);
1167: bytes++;
1168: }
1169: return bytes;
1170: }
1171:
1.77 itojun 1172: static void
1.161 deraadt 1173: client_process_input(fd_set *readset)
1.17 markus 1174: {
1.21 deraadt 1175: int len;
1.31 markus 1176: char buf[8192];
1.16 markus 1177:
1.11 markus 1178: /* Read input from stdin. */
1179: if (FD_ISSET(fileno(stdin), readset)) {
1180: /* Read as much as possible. */
1181: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1182: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1183: return; /* we'll try again later */
1.11 markus 1184: if (len <= 0) {
1.13 markus 1185: /*
1186: * Received EOF or error. They are treated
1187: * similarly, except that an error message is printed
1188: * if it was an error condition.
1189: */
1.11 markus 1190: if (len < 0) {
1.197 djm 1191: snprintf(buf, sizeof buf, "read: %.100s\r\n",
1192: strerror(errno));
1.11 markus 1193: buffer_append(&stderr_buffer, buf, strlen(buf));
1194: }
1195: /* Mark that we have seen EOF. */
1196: stdin_eof = 1;
1.13 markus 1197: /*
1198: * Send an EOF message to the server unless there is
1199: * data in the buffer. If there is data in the
1200: * buffer, no message will be sent now. Code
1201: * elsewhere will send the EOF when the buffer
1202: * becomes empty if stdin_eof is set.
1203: */
1.11 markus 1204: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1205: packet_start(SSH_CMSG_EOF);
1206: packet_send();
1.11 markus 1207: }
1.195 djm 1208: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1209: /*
1210: * Normal successful read, and no escape character.
1211: * Just append the data to buffer.
1212: */
1.11 markus 1213: buffer_append(&stdin_buffer, buf, len);
1214: } else {
1.13 markus 1215: /*
1.197 djm 1216: * Normal, successful read. But we have an escape
1217: * character and have to process the characters one
1218: * by one.
1.13 markus 1219: */
1.195 djm 1220: if (process_escapes(NULL, &stdin_buffer,
1221: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1222: return;
1.11 markus 1223: }
1224: }
1225: }
1226:
1.77 itojun 1227: static void
1.161 deraadt 1228: client_process_output(fd_set *writeset)
1.11 markus 1229: {
1230: int len;
1231: char buf[100];
1.1 deraadt 1232:
1.11 markus 1233: /* Write buffered output to stdout. */
1234: if (FD_ISSET(fileno(stdout), writeset)) {
1235: /* Write as much data as possible. */
1236: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1237: buffer_len(&stdout_buffer));
1.11 markus 1238: if (len <= 0) {
1.64 markus 1239: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1240: len = 0;
1241: else {
1.13 markus 1242: /*
1243: * An error or EOF was encountered. Put an
1244: * error message to stderr buffer.
1245: */
1.197 djm 1246: snprintf(buf, sizeof buf,
1247: "write stdout: %.50s\r\n", strerror(errno));
1.11 markus 1248: buffer_append(&stderr_buffer, buf, strlen(buf));
1249: quit_pending = 1;
1250: return;
1251: }
1252: }
1253: /* Consume printed data from the buffer. */
1254: buffer_consume(&stdout_buffer, len);
1255: }
1256: /* Write buffered output to stderr. */
1257: if (FD_ISSET(fileno(stderr), writeset)) {
1258: /* Write as much data as possible. */
1259: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1260: buffer_len(&stderr_buffer));
1.11 markus 1261: if (len <= 0) {
1.64 markus 1262: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1263: len = 0;
1264: else {
1.197 djm 1265: /*
1266: * EOF or error, but can't even print
1267: * error message.
1268: */
1.11 markus 1269: quit_pending = 1;
1270: return;
1271: }
1272: }
1273: /* Consume printed characters from the buffer. */
1274: buffer_consume(&stderr_buffer, len);
1275: }
1.1 deraadt 1276: }
1277:
1.13 markus 1278: /*
1.15 markus 1279: * Get packets from the connection input buffer, and process them as long as
1280: * there are packets available.
1281: *
1282: * Any unknown packets received during the actual
1283: * session cause the session to terminate. This is
1284: * intended to make debugging easier since no
1285: * confirmations are sent. Any compatible protocol
1286: * extensions must be negotiated during the
1287: * preparatory phase.
1288: */
1289:
1.77 itojun 1290: static void
1.49 itojun 1291: client_process_buffered_input_packets(void)
1.15 markus 1292: {
1.197 djm 1293: dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1294: compat20 ? xxx_kex : NULL);
1.15 markus 1295: }
1296:
1.31 markus 1297: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1298:
1.195 djm 1299: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1300: void *
1301: client_new_escape_filter_ctx(int escape_char)
1302: {
1303: struct escape_filter_ctx *ret;
1304:
1305: ret = xmalloc(sizeof(*ret));
1306: ret->escape_pending = 0;
1307: ret->escape_char = escape_char;
1308: return (void *)ret;
1309: }
1310:
1.198 djm 1311: /* Free the escape filter context on channel free */
1312: void
1313: client_filter_cleanup(int cid, void *ctx)
1314: {
1315: xfree(ctx);
1316: }
1317:
1.195 djm 1318: int
1319: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1320: {
1.190 djm 1321: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1322: return 0;
1323:
1.195 djm 1324: return process_escapes(c, &c->input, &c->output, &c->extended,
1325: buf, len);
1.30 markus 1326: }
1327:
1.77 itojun 1328: static void
1.60 markus 1329: client_channel_closed(int id, void *arg)
1330: {
1.83 markus 1331: channel_cancel_cleanup(id);
1.60 markus 1332: session_closed = 1;
1.233 ! djm 1333: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1334: }
1335:
1.15 markus 1336: /*
1.13 markus 1337: * Implements the interactive session with the server. This is called after
1338: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1339: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1340: * used as an escape character for terminating or suspending the session.
1.13 markus 1341: */
1.1 deraadt 1342:
1.20 markus 1343: int
1.30 markus 1344: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1345: {
1.46 markus 1346: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1347: double start_time, total_time;
1.130 avsm 1348: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1.200 markus 1349: u_int64_t ibytes, obytes;
1.130 avsm 1350: u_int nalloc = 0;
1.11 markus 1351: char buf[100];
1352:
1353: debug("Entering interactive session.");
1354:
1355: start_time = get_current_time();
1356:
1357: /* Initialize variables. */
1.195 djm 1358: escape_pending1 = 0;
1.11 markus 1359: last_was_cr = 1;
1360: exit_status = -1;
1361: stdin_eof = 0;
1362: buffer_high = 64 * 1024;
1363: connection_in = packet_get_connection_in();
1364: connection_out = packet_get_connection_out();
1.46 markus 1365: max_fd = MAX(connection_in, connection_out);
1366:
1367: if (!compat20) {
1.63 markus 1368: /* enable nonblocking unless tty */
1369: if (!isatty(fileno(stdin)))
1370: set_nonblock(fileno(stdin));
1371: if (!isatty(fileno(stdout)))
1372: set_nonblock(fileno(stdout));
1373: if (!isatty(fileno(stderr)))
1374: set_nonblock(fileno(stderr));
1.46 markus 1375: max_fd = MAX(max_fd, fileno(stdin));
1376: max_fd = MAX(max_fd, fileno(stdout));
1377: max_fd = MAX(max_fd, fileno(stderr));
1378: }
1.11 markus 1379: quit_pending = 0;
1.195 djm 1380: escape_char1 = escape_char_arg;
1.11 markus 1381:
1382: /* Initialize buffers. */
1383: buffer_init(&stdin_buffer);
1384: buffer_init(&stdout_buffer);
1385: buffer_init(&stderr_buffer);
1386:
1.15 markus 1387: client_init_dispatch();
1388:
1.105 markus 1389: /*
1390: * Set signal handlers, (e.g. to restore non-blocking mode)
1391: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1392: */
1.131 djm 1393: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1394: signal(SIGHUP, signal_handler);
1.105 markus 1395: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1396: signal(SIGINT, signal_handler);
1397: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1398: signal(SIGQUIT, signal_handler);
1399: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1400: signal(SIGTERM, signal_handler);
1.132 djm 1401: signal(SIGWINCH, window_change_handler);
1.11 markus 1402:
1403: if (have_pty)
1.233 ! djm 1404: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1405:
1.48 markus 1406: if (compat20) {
1407: session_ident = ssh2_chan_id;
1.232 djm 1408: if (session_ident != -1) {
1409: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1410: channel_register_filter(session_ident,
1411: client_simple_escape_filter, NULL,
1412: client_filter_cleanup,
1413: client_new_escape_filter_ctx(
1414: escape_char_arg));
1415: }
1.60 markus 1416: channel_register_cleanup(session_ident,
1.143 djm 1417: client_channel_closed, 0);
1.232 djm 1418: }
1.48 markus 1419: } else {
1420: /* Check if we should immediately send eof on stdin. */
1.16 markus 1421: client_check_initial_eof_on_stdin();
1.48 markus 1422: }
1.30 markus 1423:
1.11 markus 1424: /* Main loop of the client for the interactive session mode. */
1425: while (!quit_pending) {
1426:
1.13 markus 1427: /* Process buffered packets sent by the server. */
1.11 markus 1428: client_process_buffered_input_packets();
1429:
1.60 markus 1430: if (compat20 && session_closed && !channel_still_open())
1431: break;
1432:
1.56 markus 1433: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1434:
1.56 markus 1435: if (rekeying) {
1436: debug("rekeying in progress");
1437: } else {
1438: /*
1439: * Make packets of buffered stdin data, and buffer
1440: * them for sending to the server.
1441: */
1442: if (!compat20)
1443: client_make_packets_from_stdin_data();
1.11 markus 1444:
1.56 markus 1445: /*
1446: * Make packets from buffered channel data, and
1447: * enqueue them for sending to the server.
1448: */
1449: if (packet_not_very_much_data_to_write())
1450: channel_output_poll();
1.11 markus 1451:
1.56 markus 1452: /*
1453: * Check if the window size has changed, and buffer a
1454: * message about it to the server if so.
1455: */
1456: client_check_window_change();
1.11 markus 1457:
1.56 markus 1458: if (quit_pending)
1459: break;
1460: }
1.13 markus 1461: /*
1462: * Wait until we have something to do (something becomes
1463: * available on one of the descriptors).
1464: */
1.81 markus 1465: max_fd2 = max_fd;
1.56 markus 1466: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1467: &max_fd2, &nalloc, rekeying);
1.11 markus 1468:
1469: if (quit_pending)
1470: break;
1471:
1.56 markus 1472: /* Do channel operations unless rekeying in progress. */
1473: if (!rekeying) {
1474: channel_after_select(readset, writeset);
1.108 markus 1475: if (need_rekeying || packet_need_rekeying()) {
1476: debug("need rekeying");
1.56 markus 1477: xxx_kex->done = 0;
1478: kex_send_kexinit(xxx_kex);
1479: need_rekeying = 0;
1480: }
1481: }
1.11 markus 1482:
1.17 markus 1483: /* Buffer input from the connection. */
1.46 markus 1484: client_process_net_input(readset);
1.17 markus 1485:
1486: if (quit_pending)
1487: break;
1.11 markus 1488:
1.17 markus 1489: if (!compat20) {
1490: /* Buffer data from stdin */
1.46 markus 1491: client_process_input(readset);
1.17 markus 1492: /*
1493: * Process output to stdout and stderr. Output to
1494: * the connection is processed elsewhere (above).
1495: */
1.46 markus 1496: client_process_output(writeset);
1.214 andreas 1497: }
1498:
1499: if (session_resumed) {
1500: connection_in = packet_get_connection_in();
1501: connection_out = packet_get_connection_out();
1502: max_fd = MAX(max_fd, connection_out);
1503: max_fd = MAX(max_fd, connection_in);
1504: session_resumed = 0;
1.17 markus 1505: }
1.11 markus 1506:
1.197 djm 1507: /*
1508: * Send as much buffered packet data as possible to the
1509: * sender.
1510: */
1.46 markus 1511: if (FD_ISSET(connection_out, writeset))
1.11 markus 1512: packet_write_poll();
1.222 djm 1513:
1514: /*
1515: * If we are a backgrounded control master, and the
1516: * timeout has expired without any active client
1517: * connections, then quit.
1518: */
1519: if (control_persist_exit_time > 0) {
1520: if (time(NULL) >= control_persist_exit_time) {
1521: debug("ControlPersist timeout expired");
1522: break;
1523: }
1524: }
1.11 markus 1525: }
1.46 markus 1526: if (readset)
1527: xfree(readset);
1528: if (writeset)
1529: xfree(writeset);
1.11 markus 1530:
1531: /* Terminate the session. */
1532:
1533: /* Stop watching for window change. */
1.132 djm 1534: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1535:
1.213 stevesk 1536: if (compat20) {
1537: packet_start(SSH2_MSG_DISCONNECT);
1538: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1539: packet_put_cstring("disconnected by user");
1.219 djm 1540: packet_put_cstring(""); /* language tag */
1.213 stevesk 1541: packet_send();
1542: packet_write_wait();
1543: }
1.11 markus 1544:
1.76 markus 1545: channel_free_all();
1.11 markus 1546:
1.75 markus 1547: if (have_pty)
1.233 ! djm 1548: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1549:
1550: /* restore blocking io */
1551: if (!isatty(fileno(stdin)))
1552: unset_nonblock(fileno(stdin));
1553: if (!isatty(fileno(stdout)))
1554: unset_nonblock(fileno(stdout));
1555: if (!isatty(fileno(stderr)))
1556: unset_nonblock(fileno(stderr));
1.116 dtucker 1557:
1558: /*
1559: * If there was no shell or command requested, there will be no remote
1560: * exit status to be returned. In that case, clear error code if the
1561: * connection was deliberately terminated at this end.
1562: */
1563: if (no_shell_flag && received_signal == SIGTERM) {
1564: received_signal = 0;
1565: exit_status = 0;
1566: }
1.75 markus 1567:
1.113 markus 1568: if (received_signal)
1.89 itojun 1569: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1570:
1.13 markus 1571: /*
1572: * In interactive mode (with pseudo tty) display a message indicating
1573: * that the connection has been closed.
1574: */
1.11 markus 1575: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1576: snprintf(buf, sizeof buf,
1577: "Connection to %.64s closed.\r\n", host);
1.11 markus 1578: buffer_append(&stderr_buffer, buf, strlen(buf));
1579: }
1.70 markus 1580:
1.11 markus 1581: /* Output any buffered data for stdout. */
1.231 djm 1582: if (buffer_len(&stdout_buffer) > 0) {
1.230 djm 1583: len = atomicio(vwrite, fileno(stdout),
1584: buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer));
1.231 djm 1585: if (len < 0 || (u_int)len != buffer_len(&stdout_buffer))
1.11 markus 1586: error("Write failed flushing stdout buffer.");
1.231 djm 1587: else
1588: buffer_consume(&stdout_buffer, len);
1.11 markus 1589: }
1590:
1591: /* Output any buffered data for stderr. */
1.231 djm 1592: if (buffer_len(&stderr_buffer) > 0) {
1.230 djm 1593: len = atomicio(vwrite, fileno(stderr),
1594: buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1.231 djm 1595: if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1.11 markus 1596: error("Write failed flushing stderr buffer.");
1.231 djm 1597: else
1598: buffer_consume(&stderr_buffer, len);
1.11 markus 1599: }
1600:
1601: /* Clear and free any buffers. */
1602: memset(buf, 0, sizeof(buf));
1603: buffer_free(&stdin_buffer);
1604: buffer_free(&stdout_buffer);
1605: buffer_free(&stderr_buffer);
1606:
1607: /* Report bytes transferred, and transfer rates. */
1608: total_time = get_current_time() - start_time;
1.200 markus 1609: packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1610: packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1611: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1612: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1613: if (total_time > 0)
1.200 markus 1614: verbose("Bytes per second: sent %.1f, received %.1f",
1615: obytes / total_time, ibytes / total_time);
1.11 markus 1616: /* Return the exit status of the program. */
1617: debug("Exit status %d", exit_status);
1618: return exit_status;
1.15 markus 1619: }
1620:
1621: /*********/
1622:
1.77 itojun 1623: static void
1.94 markus 1624: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1625: {
1.42 markus 1626: u_int data_len;
1.15 markus 1627: char *data = packet_get_string(&data_len);
1.93 markus 1628: packet_check_eom();
1.15 markus 1629: buffer_append(&stdout_buffer, data, data_len);
1630: memset(data, 0, data_len);
1631: xfree(data);
1632: }
1.77 itojun 1633: static void
1.94 markus 1634: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1635: {
1.42 markus 1636: u_int data_len;
1.15 markus 1637: char *data = packet_get_string(&data_len);
1.93 markus 1638: packet_check_eom();
1.15 markus 1639: buffer_append(&stderr_buffer, data, data_len);
1640: memset(data, 0, data_len);
1641: xfree(data);
1642: }
1.77 itojun 1643: static void
1.94 markus 1644: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1645: {
1646: exit_status = packet_get_int();
1.93 markus 1647: packet_check_eom();
1.15 markus 1648: /* Acknowledge the exit. */
1649: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1650: packet_send();
1651: /*
1652: * Must wait for packet to be sent since we are
1653: * exiting the loop.
1654: */
1655: packet_write_wait();
1656: /* Flag that we want to exit. */
1657: quit_pending = 1;
1658: }
1.115 markus 1659: static void
1660: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1661: {
1662: Channel *c = NULL;
1663: int remote_id, sock;
1664:
1665: /* Read the remote channel number from the message. */
1666: remote_id = packet_get_int();
1667: packet_check_eom();
1668:
1669: /*
1670: * Get a connection to the local authentication agent (this may again
1671: * get forwarded).
1672: */
1673: sock = ssh_get_authentication_socket();
1674:
1675: /*
1676: * If we could not connect the agent, send an error message back to
1677: * the server. This should never happen unless the agent dies,
1678: * because authentication forwarding is only enabled if we have an
1679: * agent.
1680: */
1681: if (sock >= 0) {
1682: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1683: -1, 0, 0, 0, "authentication agent connection", 1);
1684: c->remote_id = remote_id;
1685: c->force_drain = 1;
1686: }
1687: if (c == NULL) {
1688: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1689: packet_put_int(remote_id);
1690: } else {
1691: /* Send a confirmation to the remote host. */
1692: debug("Forwarding authentication connection.");
1693: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1694: packet_put_int(remote_id);
1695: packet_put_int(c->self);
1696: }
1697: packet_send();
1698: }
1.15 markus 1699:
1.77 itojun 1700: static Channel *
1.40 markus 1701: client_request_forwarded_tcpip(const char *request_type, int rchan)
1702: {
1.103 deraadt 1703: Channel *c = NULL;
1.40 markus 1704: char *listen_address, *originator_address;
1.208 djm 1705: u_short listen_port, originator_port;
1.40 markus 1706:
1707: /* Get rest of the packet */
1708: listen_address = packet_get_string(NULL);
1709: listen_port = packet_get_int();
1710: originator_address = packet_get_string(NULL);
1711: originator_port = packet_get_int();
1.93 markus 1712: packet_check_eom();
1.40 markus 1713:
1.191 djm 1714: debug("client_request_forwarded_tcpip: listen %s port %d, "
1715: "originator %s port %d", listen_address, listen_port,
1716: originator_address, originator_port);
1717:
1718: c = channel_connect_by_listen_address(listen_port,
1719: "forwarded-tcpip", originator_address);
1.40 markus 1720:
1721: xfree(originator_address);
1722: xfree(listen_address);
1723: return c;
1724: }
1725:
1.103 deraadt 1726: static Channel *
1.40 markus 1727: client_request_x11(const char *request_type, int rchan)
1728: {
1729: Channel *c = NULL;
1730: char *originator;
1.208 djm 1731: u_short originator_port;
1.67 markus 1732: int sock;
1.40 markus 1733:
1734: if (!options.forward_x11) {
1735: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1736: error("Warning: this is probably a break-in attempt by a "
1737: "malicious server.");
1.221 djm 1738: return NULL;
1739: }
1740: if (x11_refuse_time != 0 && time(NULL) >= x11_refuse_time) {
1741: verbose("Rejected X11 connection after ForwardX11Timeout "
1742: "expired");
1.40 markus 1743: return NULL;
1744: }
1745: originator = packet_get_string(NULL);
1746: if (datafellows & SSH_BUG_X11FWD) {
1747: debug2("buggy server: x11 request w/o originator_port");
1748: originator_port = 0;
1749: } else {
1750: originator_port = packet_get_int();
1751: }
1.93 markus 1752: packet_check_eom();
1.40 markus 1753: /* XXX check permission */
1.47 markus 1754: debug("client_request_x11: request from %s %d", originator,
1755: originator_port);
1.67 markus 1756: xfree(originator);
1.40 markus 1757: sock = x11_connect_display();
1.67 markus 1758: if (sock < 0)
1759: return NULL;
1760: c = channel_new("x11",
1761: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1762: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1763: c->force_drain = 1;
1.40 markus 1764: return c;
1765: }
1766:
1.103 deraadt 1767: static Channel *
1.40 markus 1768: client_request_agent(const char *request_type, int rchan)
1769: {
1770: Channel *c = NULL;
1.67 markus 1771: int sock;
1.40 markus 1772:
1773: if (!options.forward_agent) {
1774: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1775: error("Warning: this is probably a break-in attempt by a "
1776: "malicious server.");
1.40 markus 1777: return NULL;
1778: }
1.177 stevesk 1779: sock = ssh_get_authentication_socket();
1.67 markus 1780: if (sock < 0)
1781: return NULL;
1782: c = channel_new("authentication agent connection",
1783: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1784: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1785: "authentication agent connection", 1);
1.82 markus 1786: c->force_drain = 1;
1.40 markus 1787: return c;
1.180 djm 1788: }
1789:
1790: int
1791: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1792: {
1793: Channel *c;
1794: int fd;
1795:
1796: if (tun_mode == SSH_TUNMODE_NO)
1797: return 0;
1798:
1799: if (!compat20) {
1.207 stevesk 1800: error("Tunnel forwarding is not supported for protocol 1");
1.180 djm 1801: return -1;
1802: }
1803:
1804: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1805:
1806: /* Open local tunnel device */
1807: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1808: error("Tunnel device open failed.");
1809: return -1;
1810: }
1811:
1812: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1813: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1814: c->datagram = 1;
1815:
1816: packet_start(SSH2_MSG_CHANNEL_OPEN);
1817: packet_put_cstring("tun@openssh.com");
1818: packet_put_int(c->self);
1819: packet_put_int(c->local_window_max);
1820: packet_put_int(c->local_maxpacket);
1821: packet_put_int(tun_mode);
1822: packet_put_int(remote_tun);
1823: packet_send();
1824:
1825: return 0;
1.40 markus 1826: }
1827:
1.22 markus 1828: /* XXXX move to generic input handler */
1.77 itojun 1829: static void
1.94 markus 1830: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1831: {
1832: Channel *c = NULL;
1833: char *ctype;
1834: int rchan;
1.102 markus 1835: u_int rmaxpack, rwindow, len;
1.22 markus 1836:
1837: ctype = packet_get_string(&len);
1838: rchan = packet_get_int();
1839: rwindow = packet_get_int();
1840: rmaxpack = packet_get_int();
1841:
1.24 markus 1842: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1843: ctype, rchan, rwindow, rmaxpack);
1844:
1.40 markus 1845: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1846: c = client_request_forwarded_tcpip(ctype, rchan);
1847: } else if (strcmp(ctype, "x11") == 0) {
1848: c = client_request_x11(ctype, rchan);
1849: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1850: c = client_request_agent(ctype, rchan);
1.22 markus 1851: }
1852: /* XXX duplicate : */
1853: if (c != NULL) {
1854: debug("confirm %s", ctype);
1855: c->remote_id = rchan;
1856: c->remote_window = rwindow;
1857: c->remote_maxpacket = rmaxpack;
1.69 markus 1858: if (c->type != SSH_CHANNEL_CONNECTING) {
1859: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1860: packet_put_int(c->remote_id);
1861: packet_put_int(c->self);
1862: packet_put_int(c->local_window);
1863: packet_put_int(c->local_maxpacket);
1864: packet_send();
1865: }
1.22 markus 1866: } else {
1867: debug("failure %s", ctype);
1868: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1869: packet_put_int(rchan);
1870: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1871: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1872: packet_put_cstring("open failed");
1.66 markus 1873: packet_put_cstring("");
1874: }
1.22 markus 1875: packet_send();
1876: }
1877: xfree(ctype);
1878: }
1.77 itojun 1879: static void
1.94 markus 1880: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1881: {
1882: Channel *c = NULL;
1.123 djm 1883: int exitval, id, reply, success = 0;
1.48 markus 1884: char *rtype;
1885:
1886: id = packet_get_int();
1887: rtype = packet_get_string(NULL);
1888: reply = packet_get_char();
1889:
1890: debug("client_input_channel_req: channel %d rtype %s reply %d",
1891: id, rtype, reply);
1892:
1.128 djm 1893: if (id == -1) {
1894: error("client_input_channel_req: request for channel -1");
1895: } else if ((c = channel_lookup(id)) == NULL) {
1.197 djm 1896: error("client_input_channel_req: channel %d: "
1897: "unknown channel", id);
1.193 markus 1898: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1899: packet_check_eom();
1900: chan_rcvd_eow(c);
1.48 markus 1901: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1902: exitval = packet_get_int();
1.217 djm 1903: if (c->ctl_chan != -1) {
1904: mux_exit_message(c, exitval);
1.215 djm 1905: success = 1;
1906: } else if (id == session_ident) {
1907: /* Record exit value of local session */
1.123 djm 1908: success = 1;
1909: exit_status = exitval;
1.215 djm 1910: } else {
1.218 djm 1911: /* Probably for a mux channel that has already closed */
1912: debug("%s: no sink for exit-status on channel %d",
1913: __func__, id);
1.123 djm 1914: }
1.93 markus 1915: packet_check_eom();
1.48 markus 1916: }
1.226 djm 1917: if (reply && c != NULL) {
1.48 markus 1918: packet_start(success ?
1919: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 1920: packet_put_int(c->remote_id);
1.48 markus 1921: packet_send();
1922: }
1923: xfree(rtype);
1924: }
1.95 markus 1925: static void
1926: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1927: {
1928: char *rtype;
1929: int want_reply;
1930: int success = 0;
1931:
1932: rtype = packet_get_string(NULL);
1933: want_reply = packet_get_char();
1.117 markus 1934: debug("client_input_global_request: rtype %s want_reply %d",
1935: rtype, want_reply);
1.95 markus 1936: if (want_reply) {
1937: packet_start(success ?
1938: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1939: packet_send();
1940: packet_write_wait();
1941: }
1942: xfree(rtype);
1943: }
1.22 markus 1944:
1.123 djm 1945: void
1.129 deraadt 1946: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 1947: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 1948: {
1949: int len;
1.132 djm 1950: Channel *c = NULL;
1.123 djm 1951:
1952: debug2("%s: id %d", __func__, id);
1953:
1.132 djm 1954: if ((c = channel_lookup(id)) == NULL)
1955: fatal("client_session2_setup: channel %d: unknown channel", id);
1.224 djm 1956:
1957: packet_set_interactive(want_tty,
1958: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 1959:
1.123 djm 1960: if (want_tty) {
1961: struct winsize ws;
1962:
1963: /* Store window size in the packet. */
1964: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1965: memset(&ws, 0, sizeof(ws));
1966:
1.190 djm 1967: channel_request_start(id, "pty-req", 1);
1.220 djm 1968: client_expect_confirm(id, "PTY allocation", 1);
1.123 djm 1969: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1970: packet_put_int((u_int)ws.ws_col);
1971: packet_put_int((u_int)ws.ws_row);
1972: packet_put_int((u_int)ws.ws_xpixel);
1973: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 1974: if (tiop == NULL)
1975: tiop = get_saved_tio();
1976: tty_make_modes(-1, tiop);
1.123 djm 1977: packet_send();
1978: /* XXX wait for reply */
1.132 djm 1979: c->client_tty = 1;
1.123 djm 1980: }
1981:
1982: /* Transfer any environment variables from client to server */
1.126 djm 1983: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1984: int i, j, matched;
1985: char *name, *val;
1986:
1987: debug("Sending environment.");
1.126 djm 1988: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1989: /* Split */
1.126 djm 1990: name = xstrdup(env[i]);
1.123 djm 1991: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1992: xfree(name);
1.123 djm 1993: continue;
1994: }
1995: *val++ = '\0';
1996:
1997: matched = 0;
1998: for (j = 0; j < options.num_send_env; j++) {
1999: if (match_pattern(name, options.send_env[j])) {
2000: matched = 1;
2001: break;
2002: }
2003: }
2004: if (!matched) {
2005: debug3("Ignored env %s", name);
1.144 stevesk 2006: xfree(name);
1.123 djm 2007: continue;
2008: }
2009:
2010: debug("Sending env %s = %s", name, val);
2011: channel_request_start(id, "env", 0);
2012: packet_put_cstring(name);
2013: packet_put_cstring(val);
2014: packet_send();
1.144 stevesk 2015: xfree(name);
1.123 djm 2016: }
2017: }
2018:
2019: len = buffer_len(cmd);
2020: if (len > 0) {
2021: if (len > 900)
2022: len = 900;
2023: if (want_subsystem) {
1.190 djm 2024: debug("Sending subsystem: %.*s",
2025: len, (u_char*)buffer_ptr(cmd));
2026: channel_request_start(id, "subsystem", 1);
2027: client_expect_confirm(id, "subsystem", 1);
1.123 djm 2028: } else {
1.190 djm 2029: debug("Sending command: %.*s",
2030: len, (u_char*)buffer_ptr(cmd));
2031: channel_request_start(id, "exec", 1);
2032: client_expect_confirm(id, "exec", 1);
1.123 djm 2033: }
2034: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2035: packet_send();
2036: } else {
1.190 djm 2037: channel_request_start(id, "shell", 1);
2038: client_expect_confirm(id, "shell", 1);
1.123 djm 2039: packet_send();
2040: }
2041: }
2042:
1.77 itojun 2043: static void
1.49 itojun 2044: client_init_dispatch_20(void)
1.16 markus 2045: {
1.55 markus 2046: dispatch_init(&dispatch_protocol_error);
1.100 markus 2047:
1.16 markus 2048: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2049: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2050: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2051: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2052: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2053: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2054: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2055: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2056: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2057: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2058: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2059: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2060:
2061: /* rekeying */
2062: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2063:
2064: /* global request reply messages */
2065: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2066: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 2067: }
1.197 djm 2068:
1.77 itojun 2069: static void
1.49 itojun 2070: client_init_dispatch_13(void)
1.15 markus 2071: {
2072: dispatch_init(NULL);
2073: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2074: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2075: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2076: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2077: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2078: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2079: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2080: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2081: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2082:
2083: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2084: &client_input_agent_open : &deny_input_open);
1.39 markus 2085: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2086: &x11_input_open : &deny_input_open);
1.15 markus 2087: }
1.197 djm 2088:
1.77 itojun 2089: static void
1.49 itojun 2090: client_init_dispatch_15(void)
1.15 markus 2091: {
2092: client_init_dispatch_13();
2093: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2094: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2095: }
1.197 djm 2096:
1.79 stevesk 2097: static void
1.49 itojun 2098: client_init_dispatch(void)
1.15 markus 2099: {
1.16 markus 2100: if (compat20)
2101: client_init_dispatch_20();
2102: else if (compat13)
1.15 markus 2103: client_init_dispatch_13();
2104: else
2105: client_init_dispatch_15();
1.232 djm 2106: }
2107:
2108: void
2109: client_stop_mux(void)
2110: {
2111: if (options.control_path != NULL && muxserver_sock != -1)
2112: unlink(options.control_path);
2113: /*
2114: * If we are in persist mode, signal that we should close when all
2115: * active channels are closed.
2116: */
2117: if (options.control_persist)
2118: session_closed = 1;
1.113 markus 2119: }
2120:
2121: /* client specific fatal cleanup */
2122: void
1.114 markus 2123: cleanup_exit(int i)
1.113 markus 2124: {
1.233 ! djm 2125: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2126: leave_non_blocking();
1.192 djm 2127: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2128: unlink(options.control_path);
1.223 djm 2129: ssh_kill_proxy_command();
1.114 markus 2130: _exit(i);
1.1 deraadt 2131: }
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