Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.249
1.249 ! dtucker 1: /* $OpenBSD: clientloop.c,v 1.248 2013/01/02 00:32:07 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;
1.234 djm 171: int id;
172: enum confirm_action action;
1.190 djm 173: };
174:
1.196 djm 175: /* Global request success/failure callbacks */
176: struct global_confirm {
177: TAILQ_ENTRY(global_confirm) entry;
178: global_confirm_cb *cb;
179: void *ctx;
180: int ref_count;
181: };
182: TAILQ_HEAD(global_confirms, global_confirm);
183: static struct global_confirms global_confirms =
184: TAILQ_HEAD_INITIALIZER(global_confirms);
185:
1.54 markus 186: /*XXX*/
187: extern Kex *xxx_kex;
188:
1.123 djm 189: void ssh_process_session2_setup(int, int, int, Buffer *);
190:
1.1 deraadt 191: /* Restores stdin to blocking mode. */
192:
1.77 itojun 193: static void
1.49 itojun 194: leave_non_blocking(void)
1.1 deraadt 195: {
1.11 markus 196: if (in_non_blocking_mode) {
1.125 djm 197: unset_nonblock(fileno(stdin));
1.11 markus 198: in_non_blocking_mode = 0;
199: }
1.1 deraadt 200: }
201:
1.11 markus 202: /* Puts stdin terminal in non-blocking mode. */
203:
1.77 itojun 204: static void
1.49 itojun 205: enter_non_blocking(void)
1.1 deraadt 206: {
1.11 markus 207: in_non_blocking_mode = 1;
1.124 djm 208: set_nonblock(fileno(stdin));
1.1 deraadt 209: }
210:
1.13 markus 211: /*
212: * Signal handler for the window change signal (SIGWINCH). This just sets a
213: * flag indicating that the window has changed.
214: */
1.157 deraadt 215: /*ARGSUSED */
1.77 itojun 216: static void
1.11 markus 217: window_change_handler(int sig)
1.1 deraadt 218: {
1.11 markus 219: received_window_change_signal = 1;
220: signal(SIGWINCH, window_change_handler);
1.1 deraadt 221: }
222:
1.13 markus 223: /*
224: * Signal handler for signals that cause the program to terminate. These
225: * signals must be trapped to restore terminal modes.
226: */
1.157 deraadt 227: /*ARGSUSED */
1.77 itojun 228: static void
1.11 markus 229: signal_handler(int sig)
1.1 deraadt 230: {
1.75 markus 231: received_signal = sig;
232: quit_pending = 1;
1.1 deraadt 233: }
234:
1.13 markus 235: /*
236: * Returns current time in seconds from Jan 1, 1970 with the maximum
237: * available resolution.
238: */
1.1 deraadt 239:
1.77 itojun 240: static double
1.49 itojun 241: get_current_time(void)
1.1 deraadt 242: {
1.11 markus 243: struct timeval tv;
244: gettimeofday(&tv, NULL);
245: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 246: }
247:
1.222 djm 248: /*
249: * Sets control_persist_exit_time to the absolute time when the
250: * backgrounded control master should exit due to expiry of the
251: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
252: * control master process, or if there is no ControlPersist timeout.
253: */
254: static void
255: set_control_persist_exit_time(void)
256: {
257: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 258: || options.control_persist_timeout == 0) {
1.222 djm 259: /* not using a ControlPersist timeout */
260: control_persist_exit_time = 0;
1.232 djm 261: } else if (channel_still_open()) {
1.222 djm 262: /* some client connections are still open */
263: if (control_persist_exit_time > 0)
264: debug2("%s: cancel scheduled exit", __func__);
265: control_persist_exit_time = 0;
266: } else if (control_persist_exit_time <= 0) {
267: /* a client connection has recently closed */
268: control_persist_exit_time = time(NULL) +
269: (time_t)options.control_persist_timeout;
270: debug2("%s: schedule exit in %d seconds", __func__,
271: options.control_persist_timeout);
272: }
273: /* else we are already counting down to the timeout */
274: }
275:
1.238 dtucker 276: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
277: static int
278: client_x11_display_valid(const char *display)
279: {
280: size_t i, dlen;
281:
282: dlen = strlen(display);
283: for (i = 0; i < dlen; i++) {
284: if (!isalnum(display[i]) &&
285: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
286: debug("Invalid character '%c' in DISPLAY", display[i]);
287: return 0;
288: }
289: }
290: return 1;
291: }
292:
1.138 djm 293: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
294: void
295: client_x11_get_proto(const char *display, const char *xauth_path,
1.221 djm 296: u_int trusted, u_int timeout, char **_proto, char **_data)
1.138 djm 297: {
298: char cmd[1024];
299: char line[512];
300: char xdisplay[512];
301: static char proto[512], data[512];
302: FILE *f;
303: int got_data = 0, generated = 0, do_unlink = 0, i;
304: char *xauthdir, *xauthfile;
305: struct stat st;
1.221 djm 306: u_int now;
1.138 djm 307:
308: xauthdir = xauthfile = NULL;
309: *_proto = proto;
310: *_data = data;
311: proto[0] = data[0] = '\0';
312:
313: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
314: debug("No xauth program.");
1.238 dtucker 315: } else if (!client_x11_display_valid(display)) {
316: logit("DISPLAY '%s' invalid, falling back to fake xauth data",
317: display);
1.138 djm 318: } else {
319: if (display == NULL) {
320: debug("x11_get_proto: DISPLAY not set");
321: return;
322: }
323: /*
324: * Handle FamilyLocal case where $DISPLAY does
325: * not match an authorization entry. For this we
326: * just try "xauth list unix:displaynum.screennum".
327: * XXX: "localhost" match to determine FamilyLocal
328: * is not perfect.
329: */
330: if (strncmp(display, "localhost:", 10) == 0) {
331: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
332: display + 10);
333: display = xdisplay;
334: }
335: if (trusted == 0) {
336: xauthdir = xmalloc(MAXPATHLEN);
337: xauthfile = xmalloc(MAXPATHLEN);
1.225 djm 338: mktemp_proto(xauthdir, MAXPATHLEN);
1.138 djm 339: if (mkdtemp(xauthdir) != NULL) {
340: do_unlink = 1;
341: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
342: xauthdir);
343: snprintf(cmd, sizeof(cmd),
344: "%s -f %s generate %s " SSH_X11_PROTO
1.221 djm 345: " untrusted timeout %u 2>" _PATH_DEVNULL,
346: xauth_path, xauthfile, display, timeout);
1.138 djm 347: debug2("x11_get_proto: %s", cmd);
348: if (system(cmd) == 0)
349: generated = 1;
1.221 djm 350: if (x11_refuse_time == 0) {
351: now = time(NULL) + 1;
352: if (UINT_MAX - timeout < now)
353: x11_refuse_time = UINT_MAX;
354: else
355: x11_refuse_time = now + timeout;
356: }
1.138 djm 357: }
358: }
1.181 markus 359:
360: /*
361: * When in untrusted mode, we read the cookie only if it was
362: * successfully generated as an untrusted one in the step
363: * above.
364: */
365: if (trusted || generated) {
366: snprintf(cmd, sizeof(cmd),
367: "%s %s%s list %s 2>" _PATH_DEVNULL,
368: xauth_path,
369: generated ? "-f " : "" ,
370: generated ? xauthfile : "",
371: display);
372: debug2("x11_get_proto: %s", cmd);
373: f = popen(cmd, "r");
374: if (f && fgets(line, sizeof(line), f) &&
375: sscanf(line, "%*s %511s %511s", proto, data) == 2)
376: got_data = 1;
377: if (f)
378: pclose(f);
379: } else
380: error("Warning: untrusted X11 forwarding setup failed: "
381: "xauth key data not generated");
1.138 djm 382: }
383:
384: if (do_unlink) {
385: unlink(xauthfile);
386: rmdir(xauthdir);
387: }
388: if (xauthdir)
389: xfree(xauthdir);
390: if (xauthfile)
391: xfree(xauthfile);
392:
393: /*
394: * If we didn't get authentication data, just make up some
395: * data. The forwarding code will check the validity of the
396: * response anyway, and substitute this data. The X11
397: * server, however, will ignore this fake data and use
398: * whatever authentication mechanisms it was using otherwise
399: * for the local connection.
400: */
401: if (!got_data) {
402: u_int32_t rnd = 0;
403:
404: logit("Warning: No xauth data; "
405: "using fake authentication data for X11 forwarding.");
406: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
407: for (i = 0; i < 16; i++) {
408: if (i % 4 == 0)
409: rnd = arc4random();
410: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
411: rnd & 0xff);
412: rnd >>= 8;
413: }
414: }
1.1 deraadt 415: }
416:
1.13 markus 417: /*
418: * This is called when the interactive is entered. This checks if there is
419: * an EOF coming on stdin. We must check this explicitly, as select() does
420: * not appear to wake up when redirecting from /dev/null.
421: */
1.1 deraadt 422:
1.77 itojun 423: static void
1.49 itojun 424: client_check_initial_eof_on_stdin(void)
1.1 deraadt 425: {
1.11 markus 426: int len;
427: char buf[1];
1.1 deraadt 428:
1.13 markus 429: /*
430: * If standard input is to be "redirected from /dev/null", we simply
431: * mark that we have seen an EOF and send an EOF message to the
432: * server. Otherwise, we try to read a single character; it appears
433: * that for some files, such /dev/null, select() never wakes up for
434: * read for this descriptor, which means that we never get EOF. This
435: * way we will get the EOF if stdin comes from /dev/null or similar.
436: */
1.11 markus 437: if (stdin_null_flag) {
438: /* Fake EOF on stdin. */
439: debug("Sending eof.");
440: stdin_eof = 1;
441: packet_start(SSH_CMSG_EOF);
442: packet_send();
443: } else {
444: enter_non_blocking();
445:
446: /* Check for immediate EOF on stdin. */
447: len = read(fileno(stdin), buf, 1);
448: if (len == 0) {
1.197 djm 449: /*
450: * EOF. Record that we have seen it and send
451: * EOF to server.
452: */
1.11 markus 453: debug("Sending eof.");
454: stdin_eof = 1;
455: packet_start(SSH_CMSG_EOF);
456: packet_send();
457: } else if (len > 0) {
1.13 markus 458: /*
459: * Got data. We must store the data in the buffer,
460: * and also process it as an escape character if
461: * appropriate.
462: */
1.195 djm 463: if ((u_char) buf[0] == escape_char1)
464: escape_pending1 = 1;
1.52 markus 465: else
1.11 markus 466: buffer_append(&stdin_buffer, buf, 1);
467: }
468: leave_non_blocking();
469: }
1.1 deraadt 470: }
471:
472:
1.13 markus 473: /*
474: * Make packets from buffered stdin data, and buffer them for sending to the
475: * connection.
476: */
1.1 deraadt 477:
1.77 itojun 478: static void
1.49 itojun 479: client_make_packets_from_stdin_data(void)
1.1 deraadt 480: {
1.42 markus 481: u_int len;
1.1 deraadt 482:
1.11 markus 483: /* Send buffered stdin data to the server. */
484: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 485: packet_not_very_much_data_to_write()) {
1.11 markus 486: len = buffer_len(&stdin_buffer);
487: /* Keep the packets at reasonable size. */
488: if (len > packet_get_maxsize())
489: len = packet_get_maxsize();
490: packet_start(SSH_CMSG_STDIN_DATA);
491: packet_put_string(buffer_ptr(&stdin_buffer), len);
492: packet_send();
493: buffer_consume(&stdin_buffer, len);
494: /* If we have a pending EOF, send it now. */
495: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
496: packet_start(SSH_CMSG_EOF);
497: packet_send();
498: }
1.1 deraadt 499: }
500: }
501:
1.13 markus 502: /*
503: * Checks if the client window has changed, and sends a packet about it to
504: * the server if so. The actual change is detected elsewhere (by a software
505: * interrupt on Unix); this just checks the flag and sends a message if
506: * appropriate.
507: */
1.1 deraadt 508:
1.77 itojun 509: static void
1.49 itojun 510: client_check_window_change(void)
1.1 deraadt 511: {
1.16 markus 512: struct winsize ws;
513:
514: if (! received_window_change_signal)
515: return;
516: /** XXX race */
517: received_window_change_signal = 0;
518:
1.37 markus 519: debug2("client_check_window_change: changed");
1.16 markus 520:
521: if (compat20) {
1.123 djm 522: channel_send_window_changes();
1.16 markus 523: } else {
1.123 djm 524: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
525: return;
1.16 markus 526: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 527: packet_put_int((u_int)ws.ws_row);
528: packet_put_int((u_int)ws.ws_col);
529: packet_put_int((u_int)ws.ws_xpixel);
530: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 531: packet_send();
1.1 deraadt 532: }
533: }
534:
1.117 markus 535: static void
536: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
537: {
1.196 djm 538: struct global_confirm *gc;
539:
540: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
541: return;
542: if (gc->cb != NULL)
543: gc->cb(type, seq, gc->ctx);
544: if (--gc->ref_count <= 0) {
545: TAILQ_REMOVE(&global_confirms, gc, entry);
546: bzero(gc, sizeof(*gc));
547: xfree(gc);
548: }
549:
1.210 andreas 550: packet_set_alive_timeouts(0);
1.117 markus 551: }
552:
553: static void
554: server_alive_check(void)
555: {
1.210 andreas 556: if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
1.228 djm 557: logit("Timeout, server %s not responding.", host);
1.176 markus 558: cleanup_exit(255);
559: }
1.117 markus 560: packet_start(SSH2_MSG_GLOBAL_REQUEST);
561: packet_put_cstring("keepalive@openssh.com");
562: packet_put_char(1); /* boolean: want reply */
563: packet_send();
1.196 djm 564: /* Insert an empty placeholder to maintain ordering */
565: client_register_global_confirm(NULL, NULL);
1.117 markus 566: }
567:
1.13 markus 568: /*
569: * Waits until the client can do something (some data becomes available on
570: * one of the file descriptors).
571: */
1.77 itojun 572: static void
1.46 markus 573: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 574: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 575: {
1.117 markus 576: struct timeval tv, *tvp;
1.222 djm 577: int timeout_secs;
1.249 ! dtucker 578: time_t minwait_secs = 0, server_alive_time = 0, now = time(NULL);
1.117 markus 579: int ret;
580:
1.46 markus 581: /* Add any selections by the channel mechanism. */
1.239 djm 582: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp,
583: &minwait_secs, rekeying);
1.11 markus 584:
1.16 markus 585: if (!compat20) {
1.17 markus 586: /* Read from the connection, unless our buffers are full. */
1.16 markus 587: if (buffer_len(&stdout_buffer) < buffer_high &&
588: buffer_len(&stderr_buffer) < buffer_high &&
589: channel_not_very_much_buffered_data())
1.46 markus 590: FD_SET(connection_in, *readsetp);
1.17 markus 591: /*
592: * Read from stdin, unless we have seen EOF or have very much
593: * buffered data to send to the server.
594: */
595: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 596: FD_SET(fileno(stdin), *readsetp);
1.17 markus 597:
598: /* Select stdout/stderr if have data in buffer. */
599: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 600: FD_SET(fileno(stdout), *writesetp);
1.17 markus 601: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 602: FD_SET(fileno(stderr), *writesetp);
1.16 markus 603: } else {
1.71 markus 604: /* channel_prepare_select could have closed the last channel */
1.84 markus 605: if (session_closed && !channel_still_open() &&
606: !packet_have_data_to_write()) {
607: /* clear mask since we did not call select() */
1.87 markus 608: memset(*readsetp, 0, *nallocp);
609: memset(*writesetp, 0, *nallocp);
1.84 markus 610: return;
1.71 markus 611: } else {
612: FD_SET(connection_in, *readsetp);
613: }
1.16 markus 614: }
1.11 markus 615:
616: /* Select server connection if have data to write to the server. */
617: if (packet_have_data_to_write())
1.46 markus 618: FD_SET(connection_out, *writesetp);
1.11 markus 619:
1.13 markus 620: /*
621: * Wait for something to happen. This will suspend the process until
622: * some selected descriptor can be read, written, or has some other
1.222 djm 623: * event pending, or a timeout expires.
1.13 markus 624: */
1.11 markus 625:
1.222 djm 626: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.249 ! dtucker 627: if (options.server_alive_interval > 0 && compat20) {
1.222 djm 628: timeout_secs = options.server_alive_interval;
1.249 ! dtucker 629: server_alive_time = now + options.server_alive_interval;
! 630: }
! 631: if (options.rekey_interval > 0 && compat20 && !rekeying)
! 632: timeout_secs = MIN(timeout_secs, packet_get_rekey_timeout());
1.222 djm 633: set_control_persist_exit_time();
634: if (control_persist_exit_time > 0) {
635: timeout_secs = MIN(timeout_secs,
1.249 ! dtucker 636: control_persist_exit_time - now);
1.222 djm 637: if (timeout_secs < 0)
638: timeout_secs = 0;
639: }
1.239 djm 640: if (minwait_secs != 0)
641: timeout_secs = MIN(timeout_secs, (int)minwait_secs);
1.222 djm 642: if (timeout_secs == INT_MAX)
1.117 markus 643: tvp = NULL;
1.129 deraadt 644: else {
1.222 djm 645: tv.tv_sec = timeout_secs;
1.117 markus 646: tv.tv_usec = 0;
647: tvp = &tv;
648: }
1.222 djm 649:
1.117 markus 650: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
651: if (ret < 0) {
1.11 markus 652: char buf[100];
1.51 markus 653:
654: /*
655: * We have to clear the select masks, because we return.
656: * We have to return, because the mainloop checks for the flags
657: * set by the signal handlers.
658: */
1.87 markus 659: memset(*readsetp, 0, *nallocp);
660: memset(*writesetp, 0, *nallocp);
1.50 deraadt 661:
1.11 markus 662: if (errno == EINTR)
663: return;
664: /* Note: we might still have data in the buffers. */
665: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
666: buffer_append(&stderr_buffer, buf, strlen(buf));
667: quit_pending = 1;
1.249 ! dtucker 668: } else if (ret == 0) {
! 669: /*
! 670: * Timeout. Could have been either keepalive or rekeying.
! 671: * Keepalive we check here, rekeying is checked in clientloop.
! 672: */
! 673: if (server_alive_time != 0 && server_alive_time <= time(NULL))
! 674: server_alive_check();
! 675: }
! 676:
1.11 markus 677: }
678:
1.77 itojun 679: static void
1.31 markus 680: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 681: {
1.11 markus 682: /* Flush stdout and stderr buffers. */
1.31 markus 683: if (buffer_len(bout) > 0)
1.197 djm 684: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
685: buffer_len(bout));
1.31 markus 686: if (buffer_len(berr) > 0)
1.197 djm 687: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
688: buffer_len(berr));
1.11 markus 689:
1.233 djm 690: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 691:
1.13 markus 692: /*
693: * Free (and clear) the buffer to reduce the amount of data that gets
694: * written to swap.
695: */
1.31 markus 696: buffer_free(bin);
697: buffer_free(bout);
698: buffer_free(berr);
1.11 markus 699:
700: /* Send the suspend signal to the program itself. */
701: kill(getpid(), SIGTSTP);
702:
1.132 djm 703: /* Reset window sizes in case they have changed */
704: received_window_change_signal = 1;
1.11 markus 705:
706: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 707: buffer_init(bin);
708: buffer_init(bout);
709: buffer_init(berr);
1.11 markus 710:
1.233 djm 711: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 712: }
713:
1.77 itojun 714: static void
1.161 deraadt 715: client_process_net_input(fd_set *readset)
1.11 markus 716: {
1.212 andreas 717: int len, cont = 0;
1.17 markus 718: char buf[8192];
1.11 markus 719:
1.13 markus 720: /*
721: * Read input from the server, and add any such data to the buffer of
722: * the packet subsystem.
723: */
1.11 markus 724: if (FD_ISSET(connection_in, readset)) {
725: /* Read as much as possible. */
1.212 andreas 726: len = roaming_read(connection_in, buf, sizeof(buf), &cont);
727: if (len == 0 && cont == 0) {
1.197 djm 728: /*
729: * Received EOF. The remote host has closed the
730: * connection.
731: */
732: snprintf(buf, sizeof buf,
733: "Connection to %.300s closed by remote host.\r\n",
734: host);
1.1 deraadt 735: buffer_append(&stderr_buffer, buf, strlen(buf));
736: quit_pending = 1;
737: return;
1.11 markus 738: }
1.13 markus 739: /*
740: * There is a kernel bug on Solaris that causes select to
741: * sometimes wake up even though there is no data available.
742: */
1.53 millert 743: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 744: len = 0;
745:
746: if (len < 0) {
1.197 djm 747: /*
748: * An error has encountered. Perhaps there is a
749: * network problem.
750: */
751: snprintf(buf, sizeof buf,
752: "Read from remote host %.300s: %.100s\r\n",
753: host, strerror(errno));
1.11 markus 754: buffer_append(&stderr_buffer, buf, strlen(buf));
755: quit_pending = 1;
756: return;
757: }
758: packet_process_incoming(buf, len);
759: }
1.17 markus 760: }
1.16 markus 761:
1.97 jakob 762: static void
1.190 djm 763: client_status_confirm(int type, Channel *c, void *ctx)
1.123 djm 764: {
1.190 djm 765: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
766: char errmsg[256];
767: int tochan;
768:
1.234 djm 769: /*
770: * If a TTY was explicitly requested, then a failure to allocate
771: * one is fatal.
772: */
773: if (cr->action == CONFIRM_TTY &&
774: (options.request_tty == REQUEST_TTY_FORCE ||
775: options.request_tty == REQUEST_TTY_YES))
776: cr->action = CONFIRM_CLOSE;
777:
1.190 djm 778: /* XXX supress on mux _client_ quietmode */
779: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 780: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 781:
782: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
783: debug2("%s request accepted on channel %d",
784: cr->request_type, c->self);
785: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
786: if (tochan) {
787: snprintf(errmsg, sizeof(errmsg),
788: "%s request failed\r\n", cr->request_type);
789: } else {
790: snprintf(errmsg, sizeof(errmsg),
791: "%s request failed on channel %d",
792: cr->request_type, c->self);
793: }
794: /* If error occurred on primary session channel, then exit */
1.234 djm 795: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 796: fatal("%s", errmsg);
1.234 djm 797: /*
798: * If error occurred on mux client, append to
799: * their stderr.
800: */
801: if (tochan) {
802: buffer_append(&c->extended, errmsg,
803: strlen(errmsg));
804: } else
1.190 djm 805: error("%s", errmsg);
1.234 djm 806: if (cr->action == CONFIRM_TTY) {
807: /*
808: * If a TTY allocation error occurred, then arrange
809: * for the correct TTY to leave raw mode.
810: */
811: if (c->self == session_ident)
812: leave_raw_mode(0);
813: else
814: mux_tty_alloc_failed(c);
815: } else if (cr->action == CONFIRM_CLOSE) {
1.190 djm 816: chan_read_failed(c);
817: chan_write_failed(c);
818: }
819: }
820: xfree(cr);
821: }
822:
823: static void
824: client_abandon_status_confirm(Channel *c, void *ctx)
825: {
826: xfree(ctx);
827: }
1.129 deraadt 828:
1.236 djm 829: void
1.234 djm 830: client_expect_confirm(int id, const char *request,
831: enum confirm_action action)
1.190 djm 832: {
833: struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
1.123 djm 834:
1.190 djm 835: cr->request_type = request;
1.234 djm 836: cr->action = action;
1.123 djm 837:
1.190 djm 838: channel_register_status_confirm(id, client_status_confirm,
839: client_abandon_status_confirm, cr);
1.196 djm 840: }
841:
842: void
843: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
844: {
1.201 djm 845: struct global_confirm *gc, *last_gc;
1.196 djm 846:
847: /* Coalesce identical callbacks */
1.201 djm 848: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
849: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
850: if (++last_gc->ref_count >= INT_MAX)
851: fatal("%s: last_gc->ref_count = %d",
852: __func__, last_gc->ref_count);
1.196 djm 853: return;
854: }
855:
856: gc = xmalloc(sizeof(*gc));
857: gc->cb = cb;
858: gc->ctx = ctx;
859: gc->ref_count = 1;
860: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 861: }
862:
863: static void
1.99 markus 864: process_cmdline(void)
1.97 jakob 865: {
866: void (*handler)(int);
1.135 djm 867: char *s, *cmd, *cancel_host;
1.237 markus 868: int delete = 0, local = 0, remote = 0, dynamic = 0;
869: int cancel_port, ok;
1.135 djm 870: Forward fwd;
1.97 jakob 871:
1.183 djm 872: bzero(&fwd, sizeof(fwd));
873: fwd.listen_host = fwd.connect_host = NULL;
874:
1.233 djm 875: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 876: handler = signal(SIGINT, SIG_IGN);
1.99 markus 877: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 878: if (s == NULL)
879: goto out;
1.179 tedu 880: while (isspace(*s))
1.97 jakob 881: s++;
1.121 djm 882: if (*s == '-')
883: s++; /* Skip cmdline '-', if any */
1.120 dtucker 884: if (*s == '\0')
1.97 jakob 885: goto out;
1.121 djm 886:
1.122 djm 887: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 888: logit("Commands:");
1.164 djm 889: logit(" -L[bind_address:]port:host:hostport "
890: "Request local forward");
891: logit(" -R[bind_address:]port:host:hostport "
892: "Request remote forward");
1.204 stevesk 893: logit(" -D[bind_address:]port "
894: "Request dynamic forward");
1.237 markus 895: logit(" -KL[bind_address:]port "
896: "Cancel local forward");
1.165 stevesk 897: logit(" -KR[bind_address:]port "
1.164 djm 898: "Cancel remote forward");
1.237 markus 899: logit(" -KD[bind_address:]port "
900: "Cancel dynamic forward");
1.146 reyk 901: if (!options.permit_local_command)
902: goto out;
1.164 djm 903: logit(" !args "
904: "Execute local command");
1.146 reyk 905: goto out;
906: }
907:
908: if (*s == '!' && options.permit_local_command) {
909: s++;
910: ssh_local_cmd(s);
1.121 djm 911: goto out;
912: }
913:
914: if (*s == 'K') {
915: delete = 1;
916: s++;
917: }
1.204 stevesk 918: if (*s == 'L')
919: local = 1;
920: else if (*s == 'R')
921: remote = 1;
922: else if (*s == 'D')
923: dynamic = 1;
924: else {
1.109 itojun 925: logit("Invalid command.");
1.97 jakob 926: goto out;
927: }
1.204 stevesk 928:
1.237 markus 929: if (delete && !compat20) {
1.109 itojun 930: logit("Not supported for SSH protocol version 1.");
1.97 jakob 931: goto out;
932: }
1.121 djm 933:
1.179 tedu 934: while (isspace(*++s))
935: ;
1.97 jakob 936:
1.217 djm 937: /* XXX update list of forwards in options */
1.121 djm 938: if (delete) {
1.135 djm 939: cancel_port = 0;
940: cancel_host = hpdelim(&s); /* may be NULL */
941: if (s != NULL) {
942: cancel_port = a2port(s);
943: cancel_host = cleanhostname(cancel_host);
944: } else {
945: cancel_port = a2port(cancel_host);
946: cancel_host = NULL;
1.121 djm 947: }
1.208 djm 948: if (cancel_port <= 0) {
1.135 djm 949: logit("Bad forwarding close port");
1.121 djm 950: goto out;
951: }
1.237 markus 952: if (remote)
953: ok = channel_request_rforward_cancel(cancel_host,
954: cancel_port) == 0;
955: else if (dynamic)
956: ok = channel_cancel_lport_listener(cancel_host,
957: cancel_port, 0, options.gateway_ports) > 0;
958: else
959: ok = channel_cancel_lport_listener(cancel_host,
960: cancel_port, CHANNEL_CANCEL_PORT_STATIC,
961: options.gateway_ports) > 0;
962: if (!ok) {
963: logit("Unkown port forwarding.");
964: goto out;
965: }
966: logit("Canceled forwarding.");
1.121 djm 967: } else {
1.209 djm 968: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 969: logit("Bad forwarding specification.");
970: goto out;
971: }
1.204 stevesk 972: if (local || dynamic) {
1.248 djm 973: if (!channel_setup_local_fwd_listener(fwd.listen_host,
1.135 djm 974: fwd.listen_port, fwd.connect_host,
1.248 djm 975: fwd.connect_port, options.gateway_ports)) {
1.121 djm 976: logit("Port forwarding failed.");
977: goto out;
978: }
1.135 djm 979: } else {
1.167 markus 980: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 981: fwd.listen_port, fwd.connect_host,
1.167 markus 982: fwd.connect_port) < 0) {
983: logit("Port forwarding failed.");
984: goto out;
985: }
1.135 djm 986: }
1.121 djm 987: logit("Forwarding port.");
988: }
989:
1.97 jakob 990: out:
991: signal(SIGINT, handler);
1.233 djm 992: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.97 jakob 993: if (cmd)
994: xfree(cmd);
1.183 djm 995: if (fwd.listen_host != NULL)
996: xfree(fwd.listen_host);
997: if (fwd.connect_host != NULL)
998: xfree(fwd.connect_host);
1.97 jakob 999: }
1000:
1.244 dtucker 1001: /* reasons to suppress output of an escape command in help output */
1002: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1003: #define SUPPRESS_PROTO1 1 /* don't show in protocol 1 sessions */
1004: #define SUPPRESS_MUXCLIENT 2 /* don't show in mux client sessions */
1005: #define SUPPRESS_MUXMASTER 4 /* don't show in mux master sessions */
1006: #define SUPPRESS_SYSLOG 8 /* don't show when logging to syslog */
1007: struct escape_help_text {
1008: const char *cmd;
1009: const char *text;
1010: unsigned int flags;
1011: };
1012: static struct escape_help_text esc_txt[] = {
1013: {".", "terminate session", SUPPRESS_MUXMASTER},
1014: {".", "terminate connection (and any multiplexed sessions)",
1015: SUPPRESS_MUXCLIENT},
1016: {"B", "send a BREAK to the remote system", SUPPRESS_PROTO1},
1017: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1018: {"R", "request rekey", SUPPRESS_PROTO1},
1.246 dtucker 1019: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 1020: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
1021: {"#", "list forwarded connections", SUPPRESS_NEVER},
1022: {"&", "background ssh (when waiting for connections to terminate)",
1023: SUPPRESS_MUXCLIENT},
1024: {"?", "this message", SUPPRESS_NEVER},
1025: };
1026:
1027: static void
1028: print_escape_help(Buffer *b, int escape_char, int protocol2, int mux_client,
1029: int using_stderr)
1030: {
1031: unsigned int i, suppress_flags;
1032: char string[1024];
1033:
1034: snprintf(string, sizeof string, "%c?\r\n"
1035: "Supported escape sequences:\r\n", escape_char);
1036: buffer_append(b, string, strlen(string));
1037:
1038: suppress_flags = (protocol2 ? 0 : SUPPRESS_PROTO1) |
1039: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
1040: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
1041: (using_stderr ? 0 : SUPPRESS_SYSLOG);
1042:
1043: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
1044: if (esc_txt[i].flags & suppress_flags)
1045: continue;
1.246 dtucker 1046: snprintf(string, sizeof string, " %c%-3s - %s\r\n",
1.244 dtucker 1047: escape_char, esc_txt[i].cmd, esc_txt[i].text);
1048: buffer_append(b, string, strlen(string));
1049: }
1050:
1051: snprintf(string, sizeof string,
1.246 dtucker 1052: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 1053: "(Note that escapes are only recognized immediately after "
1054: "newline.)\r\n", escape_char, escape_char);
1055: buffer_append(b, string, strlen(string));
1056: }
1057:
1.195 djm 1058: /*
1059: * Process the characters one by one, call with c==NULL for proto1 case.
1060: */
1.77 itojun 1061: static int
1.195 djm 1062: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
1063: char *buf, int len)
1.31 markus 1064: {
1.32 markus 1065: char string[1024];
1.31 markus 1066: pid_t pid;
1067: int bytes = 0;
1.42 markus 1068: u_int i;
1069: u_char ch;
1.31 markus 1070: char *s;
1.195 djm 1071: int *escape_pendingp, escape_char;
1072: struct escape_filter_ctx *efc;
1.31 markus 1073:
1.195 djm 1074: if (c == NULL) {
1075: escape_pendingp = &escape_pending1;
1076: escape_char = escape_char1;
1077: } else {
1078: if (c->filter_ctx == NULL)
1079: return 0;
1080: efc = (struct escape_filter_ctx *)c->filter_ctx;
1081: escape_pendingp = &efc->escape_pending;
1082: escape_char = efc->escape_char;
1083: }
1084:
1.139 djm 1085: if (len <= 0)
1086: return (0);
1087:
1088: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1089: /* Get one character at a time. */
1090: ch = buf[i];
1091:
1.195 djm 1092: if (*escape_pendingp) {
1.31 markus 1093: /* We have previously seen an escape character. */
1094: /* Clear the flag now. */
1.195 djm 1095: *escape_pendingp = 0;
1.31 markus 1096:
1097: /* Process the escaped character. */
1098: switch (ch) {
1099: case '.':
1100: /* Terminate the connection. */
1.195 djm 1101: snprintf(string, sizeof string, "%c.\r\n",
1102: escape_char);
1.32 markus 1103: buffer_append(berr, string, strlen(string));
1.31 markus 1104:
1.217 djm 1105: if (c && c->ctl_chan != -1) {
1.195 djm 1106: chan_read_failed(c);
1107: chan_write_failed(c);
1.241 dtucker 1108: mux_master_session_cleanup_cb(c->self,
1109: NULL);
1.195 djm 1110: return 0;
1111: } else
1112: quit_pending = 1;
1.31 markus 1113: return -1;
1114:
1115: case 'Z' - 64:
1.195 djm 1116: /* XXX support this for mux clients */
1.217 djm 1117: if (c && c->ctl_chan != -1) {
1.245 dtucker 1118: char b[16];
1.195 djm 1119: noescape:
1.245 dtucker 1120: if (ch == 'Z' - 64)
1121: snprintf(b, sizeof b, "^Z");
1122: else
1123: snprintf(b, sizeof b, "%c", ch);
1.195 djm 1124: snprintf(string, sizeof string,
1.245 dtucker 1125: "%c%s escape not available to "
1.195 djm 1126: "multiplexed sessions\r\n",
1.245 dtucker 1127: escape_char, b);
1.195 djm 1128: buffer_append(berr, string,
1129: strlen(string));
1130: continue;
1131: }
1.197 djm 1132: /* Suspend the program. Inform the user */
1.195 djm 1133: snprintf(string, sizeof string,
1134: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 1135: buffer_append(berr, string, strlen(string));
1.31 markus 1136:
1137: /* Restore terminal modes and suspend. */
1138: client_suspend_self(bin, bout, berr);
1139:
1140: /* We have been continued. */
1141: continue;
1142:
1.111 markus 1143: case 'B':
1144: if (compat20) {
1145: snprintf(string, sizeof string,
1146: "%cB\r\n", escape_char);
1147: buffer_append(berr, string,
1148: strlen(string));
1149: channel_request_start(session_ident,
1150: "break", 0);
1151: packet_put_int(1000);
1152: packet_send();
1153: }
1154: continue;
1155:
1.54 markus 1156: case 'R':
1.59 markus 1157: if (compat20) {
1158: if (datafellows & SSH_BUG_NOREKEY)
1.197 djm 1159: logit("Server does not "
1160: "support re-keying");
1.59 markus 1161: else
1162: need_rekeying = 1;
1163: }
1.54 markus 1164: continue;
1165:
1.242 dtucker 1166: case 'V':
1167: /* FALLTHROUGH */
1168: case 'v':
1169: if (c && c->ctl_chan != -1)
1170: goto noescape;
1171: if (!log_is_on_stderr()) {
1172: snprintf(string, sizeof string,
1173: "%c%c [Logging to syslog]\r\n",
1174: escape_char, ch);
1175: buffer_append(berr, string,
1176: strlen(string));
1177: continue;
1178: }
1179: if (ch == 'V' && options.log_level >
1180: SYSLOG_LEVEL_QUIET)
1181: log_change_level(--options.log_level);
1182: if (ch == 'v' && options.log_level <
1183: SYSLOG_LEVEL_DEBUG3)
1184: log_change_level(++options.log_level);
1185: snprintf(string, sizeof string,
1186: "%c%c [LogLevel %s]\r\n", escape_char, ch,
1187: log_level_name(options.log_level));
1188: buffer_append(berr, string, strlen(string));
1189: continue;
1190:
1.31 markus 1191: case '&':
1.217 djm 1192: if (c && c->ctl_chan != -1)
1.195 djm 1193: goto noescape;
1.31 markus 1194: /*
1.197 djm 1195: * Detach the program (continue to serve
1196: * connections, but put in background and no
1197: * more new connections).
1.31 markus 1198: */
1199: /* Restore tty modes. */
1.233 djm 1200: leave_raw_mode(
1201: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1202:
1203: /* Stop listening for new connections. */
1.86 markus 1204: channel_stop_listening();
1.31 markus 1205:
1.86 markus 1206: snprintf(string, sizeof string,
1207: "%c& [backgrounded]\n", escape_char);
1208: buffer_append(berr, string, strlen(string));
1.31 markus 1209:
1210: /* Fork into background. */
1211: pid = fork();
1212: if (pid < 0) {
1213: error("fork: %.100s", strerror(errno));
1214: continue;
1215: }
1216: if (pid != 0) { /* This is the parent. */
1217: /* The parent just exits. */
1218: exit(0);
1219: }
1220: /* The child continues serving connections. */
1.86 markus 1221: if (compat20) {
1222: buffer_append(bin, "\004", 1);
1223: /* fake EOF on stdin */
1224: return -1;
1225: } else if (!stdin_eof) {
1226: /*
1.197 djm 1227: * Sending SSH_CMSG_EOF alone does not
1228: * always appear to be enough. So we
1229: * try to send an EOF character first.
1.86 markus 1230: */
1231: packet_start(SSH_CMSG_STDIN_DATA);
1232: packet_put_string("\004", 1);
1233: packet_send();
1234: /* Close stdin. */
1235: stdin_eof = 1;
1236: if (buffer_len(bin) == 0) {
1237: packet_start(SSH_CMSG_EOF);
1238: packet_send();
1239: }
1240: }
1241: continue;
1.31 markus 1242:
1243: case '?':
1.244 dtucker 1244: print_escape_help(berr, escape_char, compat20,
1245: (c && c->ctl_chan != -1),
1246: log_is_on_stderr());
1.31 markus 1247: continue;
1248:
1249: case '#':
1.195 djm 1250: snprintf(string, sizeof string, "%c#\r\n",
1251: escape_char);
1.32 markus 1252: buffer_append(berr, string, strlen(string));
1.31 markus 1253: s = channel_open_message();
1254: buffer_append(berr, s, strlen(s));
1255: xfree(s);
1.97 jakob 1256: continue;
1257:
1258: case 'C':
1.217 djm 1259: if (c && c->ctl_chan != -1)
1.206 djm 1260: goto noescape;
1.99 markus 1261: process_cmdline();
1.31 markus 1262: continue;
1263:
1264: default:
1265: if (ch != escape_char) {
1266: buffer_put_char(bin, escape_char);
1267: bytes++;
1268: }
1269: /* Escaped characters fall through here */
1270: break;
1271: }
1272: } else {
1273: /*
1.197 djm 1274: * The previous character was not an escape char.
1275: * Check if this is an escape.
1.31 markus 1276: */
1277: if (last_was_cr && ch == escape_char) {
1.197 djm 1278: /*
1279: * It is. Set the flag and continue to
1280: * next character.
1281: */
1.195 djm 1282: *escape_pendingp = 1;
1.31 markus 1283: continue;
1284: }
1285: }
1286:
1287: /*
1288: * Normal character. Record whether it was a newline,
1289: * and append it to the buffer.
1290: */
1291: last_was_cr = (ch == '\r' || ch == '\n');
1292: buffer_put_char(bin, ch);
1293: bytes++;
1294: }
1295: return bytes;
1296: }
1297:
1.77 itojun 1298: static void
1.161 deraadt 1299: client_process_input(fd_set *readset)
1.17 markus 1300: {
1.21 deraadt 1301: int len;
1.31 markus 1302: char buf[8192];
1.16 markus 1303:
1.11 markus 1304: /* Read input from stdin. */
1305: if (FD_ISSET(fileno(stdin), readset)) {
1306: /* Read as much as possible. */
1307: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1308: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1309: return; /* we'll try again later */
1.11 markus 1310: if (len <= 0) {
1.13 markus 1311: /*
1312: * Received EOF or error. They are treated
1313: * similarly, except that an error message is printed
1314: * if it was an error condition.
1315: */
1.11 markus 1316: if (len < 0) {
1.197 djm 1317: snprintf(buf, sizeof buf, "read: %.100s\r\n",
1318: strerror(errno));
1.11 markus 1319: buffer_append(&stderr_buffer, buf, strlen(buf));
1320: }
1321: /* Mark that we have seen EOF. */
1322: stdin_eof = 1;
1.13 markus 1323: /*
1324: * Send an EOF message to the server unless there is
1325: * data in the buffer. If there is data in the
1326: * buffer, no message will be sent now. Code
1327: * elsewhere will send the EOF when the buffer
1328: * becomes empty if stdin_eof is set.
1329: */
1.11 markus 1330: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1331: packet_start(SSH_CMSG_EOF);
1332: packet_send();
1.11 markus 1333: }
1.195 djm 1334: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1335: /*
1336: * Normal successful read, and no escape character.
1337: * Just append the data to buffer.
1338: */
1.11 markus 1339: buffer_append(&stdin_buffer, buf, len);
1340: } else {
1.13 markus 1341: /*
1.197 djm 1342: * Normal, successful read. But we have an escape
1343: * character and have to process the characters one
1344: * by one.
1.13 markus 1345: */
1.195 djm 1346: if (process_escapes(NULL, &stdin_buffer,
1347: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1348: return;
1.11 markus 1349: }
1350: }
1351: }
1352:
1.77 itojun 1353: static void
1.161 deraadt 1354: client_process_output(fd_set *writeset)
1.11 markus 1355: {
1356: int len;
1357: char buf[100];
1.1 deraadt 1358:
1.11 markus 1359: /* Write buffered output to stdout. */
1360: if (FD_ISSET(fileno(stdout), writeset)) {
1361: /* Write as much data as possible. */
1362: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1363: buffer_len(&stdout_buffer));
1.11 markus 1364: if (len <= 0) {
1.64 markus 1365: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1366: len = 0;
1367: else {
1.13 markus 1368: /*
1369: * An error or EOF was encountered. Put an
1370: * error message to stderr buffer.
1371: */
1.197 djm 1372: snprintf(buf, sizeof buf,
1373: "write stdout: %.50s\r\n", strerror(errno));
1.11 markus 1374: buffer_append(&stderr_buffer, buf, strlen(buf));
1375: quit_pending = 1;
1376: return;
1377: }
1378: }
1379: /* Consume printed data from the buffer. */
1380: buffer_consume(&stdout_buffer, len);
1381: }
1382: /* Write buffered output to stderr. */
1383: if (FD_ISSET(fileno(stderr), writeset)) {
1384: /* Write as much data as possible. */
1385: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1386: buffer_len(&stderr_buffer));
1.11 markus 1387: if (len <= 0) {
1.64 markus 1388: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1389: len = 0;
1390: else {
1.197 djm 1391: /*
1392: * EOF or error, but can't even print
1393: * error message.
1394: */
1.11 markus 1395: quit_pending = 1;
1396: return;
1397: }
1398: }
1399: /* Consume printed characters from the buffer. */
1400: buffer_consume(&stderr_buffer, len);
1401: }
1.1 deraadt 1402: }
1403:
1.13 markus 1404: /*
1.15 markus 1405: * Get packets from the connection input buffer, and process them as long as
1406: * there are packets available.
1407: *
1408: * Any unknown packets received during the actual
1409: * session cause the session to terminate. This is
1410: * intended to make debugging easier since no
1411: * confirmations are sent. Any compatible protocol
1412: * extensions must be negotiated during the
1413: * preparatory phase.
1414: */
1415:
1.77 itojun 1416: static void
1.49 itojun 1417: client_process_buffered_input_packets(void)
1.15 markus 1418: {
1.197 djm 1419: dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1420: compat20 ? xxx_kex : NULL);
1.15 markus 1421: }
1422:
1.31 markus 1423: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1424:
1.195 djm 1425: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1426: void *
1427: client_new_escape_filter_ctx(int escape_char)
1428: {
1429: struct escape_filter_ctx *ret;
1430:
1431: ret = xmalloc(sizeof(*ret));
1432: ret->escape_pending = 0;
1433: ret->escape_char = escape_char;
1434: return (void *)ret;
1435: }
1436:
1.198 djm 1437: /* Free the escape filter context on channel free */
1438: void
1439: client_filter_cleanup(int cid, void *ctx)
1440: {
1441: xfree(ctx);
1442: }
1443:
1.195 djm 1444: int
1445: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1446: {
1.190 djm 1447: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1448: return 0;
1449:
1.195 djm 1450: return process_escapes(c, &c->input, &c->output, &c->extended,
1451: buf, len);
1.30 markus 1452: }
1453:
1.77 itojun 1454: static void
1.60 markus 1455: client_channel_closed(int id, void *arg)
1456: {
1.83 markus 1457: channel_cancel_cleanup(id);
1.60 markus 1458: session_closed = 1;
1.233 djm 1459: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1460: }
1461:
1.15 markus 1462: /*
1.13 markus 1463: * Implements the interactive session with the server. This is called after
1464: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1465: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1466: * used as an escape character for terminating or suspending the session.
1.13 markus 1467: */
1.1 deraadt 1468:
1.20 markus 1469: int
1.30 markus 1470: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1471: {
1.46 markus 1472: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1473: double start_time, total_time;
1.130 avsm 1474: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1.200 markus 1475: u_int64_t ibytes, obytes;
1.130 avsm 1476: u_int nalloc = 0;
1.11 markus 1477: char buf[100];
1478:
1479: debug("Entering interactive session.");
1480:
1481: start_time = get_current_time();
1482:
1483: /* Initialize variables. */
1.195 djm 1484: escape_pending1 = 0;
1.11 markus 1485: last_was_cr = 1;
1486: exit_status = -1;
1487: stdin_eof = 0;
1488: buffer_high = 64 * 1024;
1489: connection_in = packet_get_connection_in();
1490: connection_out = packet_get_connection_out();
1.46 markus 1491: max_fd = MAX(connection_in, connection_out);
1492:
1493: if (!compat20) {
1.63 markus 1494: /* enable nonblocking unless tty */
1495: if (!isatty(fileno(stdin)))
1496: set_nonblock(fileno(stdin));
1497: if (!isatty(fileno(stdout)))
1498: set_nonblock(fileno(stdout));
1499: if (!isatty(fileno(stderr)))
1500: set_nonblock(fileno(stderr));
1.46 markus 1501: max_fd = MAX(max_fd, fileno(stdin));
1502: max_fd = MAX(max_fd, fileno(stdout));
1503: max_fd = MAX(max_fd, fileno(stderr));
1504: }
1.11 markus 1505: quit_pending = 0;
1.195 djm 1506: escape_char1 = escape_char_arg;
1.11 markus 1507:
1508: /* Initialize buffers. */
1509: buffer_init(&stdin_buffer);
1510: buffer_init(&stdout_buffer);
1511: buffer_init(&stderr_buffer);
1512:
1.15 markus 1513: client_init_dispatch();
1514:
1.105 markus 1515: /*
1516: * Set signal handlers, (e.g. to restore non-blocking mode)
1517: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1518: */
1.131 djm 1519: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1520: signal(SIGHUP, signal_handler);
1.105 markus 1521: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1522: signal(SIGINT, signal_handler);
1523: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1524: signal(SIGQUIT, signal_handler);
1525: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1526: signal(SIGTERM, signal_handler);
1.132 djm 1527: signal(SIGWINCH, window_change_handler);
1.11 markus 1528:
1529: if (have_pty)
1.233 djm 1530: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1531:
1.48 markus 1532: if (compat20) {
1533: session_ident = ssh2_chan_id;
1.232 djm 1534: if (session_ident != -1) {
1535: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1536: channel_register_filter(session_ident,
1537: client_simple_escape_filter, NULL,
1538: client_filter_cleanup,
1539: client_new_escape_filter_ctx(
1540: escape_char_arg));
1541: }
1.60 markus 1542: channel_register_cleanup(session_ident,
1.143 djm 1543: client_channel_closed, 0);
1.232 djm 1544: }
1.48 markus 1545: } else {
1546: /* Check if we should immediately send eof on stdin. */
1.16 markus 1547: client_check_initial_eof_on_stdin();
1.48 markus 1548: }
1.30 markus 1549:
1.11 markus 1550: /* Main loop of the client for the interactive session mode. */
1551: while (!quit_pending) {
1552:
1.13 markus 1553: /* Process buffered packets sent by the server. */
1.11 markus 1554: client_process_buffered_input_packets();
1555:
1.60 markus 1556: if (compat20 && session_closed && !channel_still_open())
1557: break;
1558:
1.56 markus 1559: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1560:
1.56 markus 1561: if (rekeying) {
1562: debug("rekeying in progress");
1563: } else {
1564: /*
1565: * Make packets of buffered stdin data, and buffer
1566: * them for sending to the server.
1567: */
1568: if (!compat20)
1569: client_make_packets_from_stdin_data();
1.11 markus 1570:
1.56 markus 1571: /*
1572: * Make packets from buffered channel data, and
1573: * enqueue them for sending to the server.
1574: */
1575: if (packet_not_very_much_data_to_write())
1576: channel_output_poll();
1.11 markus 1577:
1.56 markus 1578: /*
1579: * Check if the window size has changed, and buffer a
1580: * message about it to the server if so.
1581: */
1582: client_check_window_change();
1.11 markus 1583:
1.56 markus 1584: if (quit_pending)
1585: break;
1586: }
1.13 markus 1587: /*
1588: * Wait until we have something to do (something becomes
1589: * available on one of the descriptors).
1590: */
1.81 markus 1591: max_fd2 = max_fd;
1.56 markus 1592: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1593: &max_fd2, &nalloc, rekeying);
1.11 markus 1594:
1595: if (quit_pending)
1596: break;
1597:
1.56 markus 1598: /* Do channel operations unless rekeying in progress. */
1599: if (!rekeying) {
1600: channel_after_select(readset, writeset);
1.108 markus 1601: if (need_rekeying || packet_need_rekeying()) {
1602: debug("need rekeying");
1.56 markus 1603: xxx_kex->done = 0;
1604: kex_send_kexinit(xxx_kex);
1605: need_rekeying = 0;
1606: }
1607: }
1.11 markus 1608:
1.17 markus 1609: /* Buffer input from the connection. */
1.46 markus 1610: client_process_net_input(readset);
1.17 markus 1611:
1612: if (quit_pending)
1613: break;
1.11 markus 1614:
1.17 markus 1615: if (!compat20) {
1616: /* Buffer data from stdin */
1.46 markus 1617: client_process_input(readset);
1.17 markus 1618: /*
1619: * Process output to stdout and stderr. Output to
1620: * the connection is processed elsewhere (above).
1621: */
1.46 markus 1622: client_process_output(writeset);
1.214 andreas 1623: }
1624:
1625: if (session_resumed) {
1626: connection_in = packet_get_connection_in();
1627: connection_out = packet_get_connection_out();
1628: max_fd = MAX(max_fd, connection_out);
1629: max_fd = MAX(max_fd, connection_in);
1630: session_resumed = 0;
1.17 markus 1631: }
1.11 markus 1632:
1.197 djm 1633: /*
1634: * Send as much buffered packet data as possible to the
1635: * sender.
1636: */
1.46 markus 1637: if (FD_ISSET(connection_out, writeset))
1.11 markus 1638: packet_write_poll();
1.222 djm 1639:
1640: /*
1641: * If we are a backgrounded control master, and the
1642: * timeout has expired without any active client
1643: * connections, then quit.
1644: */
1645: if (control_persist_exit_time > 0) {
1646: if (time(NULL) >= control_persist_exit_time) {
1647: debug("ControlPersist timeout expired");
1648: break;
1649: }
1650: }
1.11 markus 1651: }
1.46 markus 1652: if (readset)
1653: xfree(readset);
1654: if (writeset)
1655: xfree(writeset);
1.11 markus 1656:
1657: /* Terminate the session. */
1658:
1659: /* Stop watching for window change. */
1.132 djm 1660: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1661:
1.213 stevesk 1662: if (compat20) {
1663: packet_start(SSH2_MSG_DISCONNECT);
1664: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1665: packet_put_cstring("disconnected by user");
1.219 djm 1666: packet_put_cstring(""); /* language tag */
1.213 stevesk 1667: packet_send();
1668: packet_write_wait();
1669: }
1.11 markus 1670:
1.76 markus 1671: channel_free_all();
1.11 markus 1672:
1.75 markus 1673: if (have_pty)
1.233 djm 1674: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1675:
1676: /* restore blocking io */
1677: if (!isatty(fileno(stdin)))
1678: unset_nonblock(fileno(stdin));
1679: if (!isatty(fileno(stdout)))
1680: unset_nonblock(fileno(stdout));
1681: if (!isatty(fileno(stderr)))
1682: unset_nonblock(fileno(stderr));
1.116 dtucker 1683:
1684: /*
1685: * If there was no shell or command requested, there will be no remote
1686: * exit status to be returned. In that case, clear error code if the
1687: * connection was deliberately terminated at this end.
1688: */
1689: if (no_shell_flag && received_signal == SIGTERM) {
1690: received_signal = 0;
1691: exit_status = 0;
1692: }
1.75 markus 1693:
1.113 markus 1694: if (received_signal)
1.89 itojun 1695: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1696:
1.13 markus 1697: /*
1698: * In interactive mode (with pseudo tty) display a message indicating
1699: * that the connection has been closed.
1700: */
1.11 markus 1701: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1702: snprintf(buf, sizeof buf,
1703: "Connection to %.64s closed.\r\n", host);
1.11 markus 1704: buffer_append(&stderr_buffer, buf, strlen(buf));
1705: }
1.70 markus 1706:
1.11 markus 1707: /* Output any buffered data for stdout. */
1.231 djm 1708: if (buffer_len(&stdout_buffer) > 0) {
1.230 djm 1709: len = atomicio(vwrite, fileno(stdout),
1710: buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer));
1.231 djm 1711: if (len < 0 || (u_int)len != buffer_len(&stdout_buffer))
1.11 markus 1712: error("Write failed flushing stdout buffer.");
1.231 djm 1713: else
1714: buffer_consume(&stdout_buffer, len);
1.11 markus 1715: }
1716:
1717: /* Output any buffered data for stderr. */
1.231 djm 1718: if (buffer_len(&stderr_buffer) > 0) {
1.230 djm 1719: len = atomicio(vwrite, fileno(stderr),
1720: buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1.231 djm 1721: if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1.11 markus 1722: error("Write failed flushing stderr buffer.");
1.231 djm 1723: else
1724: buffer_consume(&stderr_buffer, len);
1.11 markus 1725: }
1726:
1727: /* Clear and free any buffers. */
1728: memset(buf, 0, sizeof(buf));
1729: buffer_free(&stdin_buffer);
1730: buffer_free(&stdout_buffer);
1731: buffer_free(&stderr_buffer);
1732:
1733: /* Report bytes transferred, and transfer rates. */
1734: total_time = get_current_time() - start_time;
1.200 markus 1735: packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1736: packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1737: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1738: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1739: if (total_time > 0)
1.200 markus 1740: verbose("Bytes per second: sent %.1f, received %.1f",
1741: obytes / total_time, ibytes / total_time);
1.11 markus 1742: /* Return the exit status of the program. */
1743: debug("Exit status %d", exit_status);
1744: return exit_status;
1.15 markus 1745: }
1746:
1747: /*********/
1748:
1.77 itojun 1749: static void
1.94 markus 1750: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1751: {
1.42 markus 1752: u_int data_len;
1.15 markus 1753: char *data = packet_get_string(&data_len);
1.93 markus 1754: packet_check_eom();
1.15 markus 1755: buffer_append(&stdout_buffer, data, data_len);
1756: memset(data, 0, data_len);
1757: xfree(data);
1758: }
1.77 itojun 1759: static void
1.94 markus 1760: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1761: {
1.42 markus 1762: u_int data_len;
1.15 markus 1763: char *data = packet_get_string(&data_len);
1.93 markus 1764: packet_check_eom();
1.15 markus 1765: buffer_append(&stderr_buffer, data, data_len);
1766: memset(data, 0, data_len);
1767: xfree(data);
1768: }
1.77 itojun 1769: static void
1.94 markus 1770: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1771: {
1772: exit_status = packet_get_int();
1.93 markus 1773: packet_check_eom();
1.15 markus 1774: /* Acknowledge the exit. */
1775: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1776: packet_send();
1777: /*
1778: * Must wait for packet to be sent since we are
1779: * exiting the loop.
1780: */
1781: packet_write_wait();
1782: /* Flag that we want to exit. */
1783: quit_pending = 1;
1784: }
1.115 markus 1785: static void
1786: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1787: {
1788: Channel *c = NULL;
1789: int remote_id, sock;
1790:
1791: /* Read the remote channel number from the message. */
1792: remote_id = packet_get_int();
1793: packet_check_eom();
1794:
1795: /*
1796: * Get a connection to the local authentication agent (this may again
1797: * get forwarded).
1798: */
1799: sock = ssh_get_authentication_socket();
1800:
1801: /*
1802: * If we could not connect the agent, send an error message back to
1803: * the server. This should never happen unless the agent dies,
1804: * because authentication forwarding is only enabled if we have an
1805: * agent.
1806: */
1807: if (sock >= 0) {
1808: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1809: -1, 0, 0, 0, "authentication agent connection", 1);
1810: c->remote_id = remote_id;
1811: c->force_drain = 1;
1812: }
1813: if (c == NULL) {
1814: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1815: packet_put_int(remote_id);
1816: } else {
1817: /* Send a confirmation to the remote host. */
1818: debug("Forwarding authentication connection.");
1819: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1820: packet_put_int(remote_id);
1821: packet_put_int(c->self);
1822: }
1823: packet_send();
1824: }
1.15 markus 1825:
1.77 itojun 1826: static Channel *
1.40 markus 1827: client_request_forwarded_tcpip(const char *request_type, int rchan)
1828: {
1.103 deraadt 1829: Channel *c = NULL;
1.40 markus 1830: char *listen_address, *originator_address;
1.208 djm 1831: u_short listen_port, originator_port;
1.40 markus 1832:
1833: /* Get rest of the packet */
1834: listen_address = packet_get_string(NULL);
1835: listen_port = packet_get_int();
1836: originator_address = packet_get_string(NULL);
1837: originator_port = packet_get_int();
1.93 markus 1838: packet_check_eom();
1.40 markus 1839:
1.191 djm 1840: debug("client_request_forwarded_tcpip: listen %s port %d, "
1841: "originator %s port %d", listen_address, listen_port,
1842: originator_address, originator_port);
1843:
1844: c = channel_connect_by_listen_address(listen_port,
1845: "forwarded-tcpip", originator_address);
1.40 markus 1846:
1847: xfree(originator_address);
1848: xfree(listen_address);
1849: return c;
1850: }
1851:
1.103 deraadt 1852: static Channel *
1.40 markus 1853: client_request_x11(const char *request_type, int rchan)
1854: {
1855: Channel *c = NULL;
1856: char *originator;
1.208 djm 1857: u_short originator_port;
1.67 markus 1858: int sock;
1.40 markus 1859:
1860: if (!options.forward_x11) {
1861: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1862: error("Warning: this is probably a break-in attempt by a "
1863: "malicious server.");
1.221 djm 1864: return NULL;
1865: }
1866: if (x11_refuse_time != 0 && time(NULL) >= x11_refuse_time) {
1867: verbose("Rejected X11 connection after ForwardX11Timeout "
1868: "expired");
1.40 markus 1869: return NULL;
1870: }
1871: originator = packet_get_string(NULL);
1872: if (datafellows & SSH_BUG_X11FWD) {
1873: debug2("buggy server: x11 request w/o originator_port");
1874: originator_port = 0;
1875: } else {
1876: originator_port = packet_get_int();
1877: }
1.93 markus 1878: packet_check_eom();
1.40 markus 1879: /* XXX check permission */
1.47 markus 1880: debug("client_request_x11: request from %s %d", originator,
1881: originator_port);
1.67 markus 1882: xfree(originator);
1.40 markus 1883: sock = x11_connect_display();
1.67 markus 1884: if (sock < 0)
1885: return NULL;
1886: c = channel_new("x11",
1887: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1888: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1889: c->force_drain = 1;
1.40 markus 1890: return c;
1891: }
1892:
1.103 deraadt 1893: static Channel *
1.40 markus 1894: client_request_agent(const char *request_type, int rchan)
1895: {
1896: Channel *c = NULL;
1.67 markus 1897: int sock;
1.40 markus 1898:
1899: if (!options.forward_agent) {
1900: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1901: error("Warning: this is probably a break-in attempt by a "
1902: "malicious server.");
1.40 markus 1903: return NULL;
1904: }
1.177 stevesk 1905: sock = ssh_get_authentication_socket();
1.67 markus 1906: if (sock < 0)
1907: return NULL;
1908: c = channel_new("authentication agent connection",
1909: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1910: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1911: "authentication agent connection", 1);
1.82 markus 1912: c->force_drain = 1;
1.40 markus 1913: return c;
1.180 djm 1914: }
1915:
1916: int
1917: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1918: {
1919: Channel *c;
1920: int fd;
1921:
1922: if (tun_mode == SSH_TUNMODE_NO)
1923: return 0;
1924:
1925: if (!compat20) {
1.207 stevesk 1926: error("Tunnel forwarding is not supported for protocol 1");
1.180 djm 1927: return -1;
1928: }
1929:
1930: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1931:
1932: /* Open local tunnel device */
1933: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1934: error("Tunnel device open failed.");
1935: return -1;
1936: }
1937:
1938: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1939: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1940: c->datagram = 1;
1941:
1942: packet_start(SSH2_MSG_CHANNEL_OPEN);
1943: packet_put_cstring("tun@openssh.com");
1944: packet_put_int(c->self);
1945: packet_put_int(c->local_window_max);
1946: packet_put_int(c->local_maxpacket);
1947: packet_put_int(tun_mode);
1948: packet_put_int(remote_tun);
1949: packet_send();
1950:
1951: return 0;
1.40 markus 1952: }
1953:
1.22 markus 1954: /* XXXX move to generic input handler */
1.77 itojun 1955: static void
1.94 markus 1956: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1957: {
1958: Channel *c = NULL;
1959: char *ctype;
1960: int rchan;
1.102 markus 1961: u_int rmaxpack, rwindow, len;
1.22 markus 1962:
1963: ctype = packet_get_string(&len);
1964: rchan = packet_get_int();
1965: rwindow = packet_get_int();
1966: rmaxpack = packet_get_int();
1967:
1.24 markus 1968: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1969: ctype, rchan, rwindow, rmaxpack);
1970:
1.40 markus 1971: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1972: c = client_request_forwarded_tcpip(ctype, rchan);
1973: } else if (strcmp(ctype, "x11") == 0) {
1974: c = client_request_x11(ctype, rchan);
1975: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1976: c = client_request_agent(ctype, rchan);
1.22 markus 1977: }
1978: /* XXX duplicate : */
1979: if (c != NULL) {
1980: debug("confirm %s", ctype);
1981: c->remote_id = rchan;
1982: c->remote_window = rwindow;
1983: c->remote_maxpacket = rmaxpack;
1.69 markus 1984: if (c->type != SSH_CHANNEL_CONNECTING) {
1985: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1986: packet_put_int(c->remote_id);
1987: packet_put_int(c->self);
1988: packet_put_int(c->local_window);
1989: packet_put_int(c->local_maxpacket);
1990: packet_send();
1991: }
1.22 markus 1992: } else {
1993: debug("failure %s", ctype);
1994: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1995: packet_put_int(rchan);
1996: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1997: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1998: packet_put_cstring("open failed");
1.66 markus 1999: packet_put_cstring("");
2000: }
1.22 markus 2001: packet_send();
2002: }
2003: xfree(ctype);
2004: }
1.77 itojun 2005: static void
1.94 markus 2006: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 2007: {
2008: Channel *c = NULL;
1.123 djm 2009: int exitval, id, reply, success = 0;
1.48 markus 2010: char *rtype;
2011:
2012: id = packet_get_int();
2013: rtype = packet_get_string(NULL);
2014: reply = packet_get_char();
2015:
2016: debug("client_input_channel_req: channel %d rtype %s reply %d",
2017: id, rtype, reply);
2018:
1.128 djm 2019: if (id == -1) {
2020: error("client_input_channel_req: request for channel -1");
2021: } else if ((c = channel_lookup(id)) == NULL) {
1.197 djm 2022: error("client_input_channel_req: channel %d: "
2023: "unknown channel", id);
1.193 markus 2024: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
2025: packet_check_eom();
2026: chan_rcvd_eow(c);
1.48 markus 2027: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 2028: exitval = packet_get_int();
1.217 djm 2029: if (c->ctl_chan != -1) {
2030: mux_exit_message(c, exitval);
1.215 djm 2031: success = 1;
2032: } else if (id == session_ident) {
2033: /* Record exit value of local session */
1.123 djm 2034: success = 1;
2035: exit_status = exitval;
1.215 djm 2036: } else {
1.218 djm 2037: /* Probably for a mux channel that has already closed */
2038: debug("%s: no sink for exit-status on channel %d",
2039: __func__, id);
1.123 djm 2040: }
1.93 markus 2041: packet_check_eom();
1.48 markus 2042: }
1.226 djm 2043: if (reply && c != NULL) {
1.48 markus 2044: packet_start(success ?
2045: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 2046: packet_put_int(c->remote_id);
1.48 markus 2047: packet_send();
2048: }
2049: xfree(rtype);
2050: }
1.95 markus 2051: static void
2052: client_input_global_request(int type, u_int32_t seq, void *ctxt)
2053: {
2054: char *rtype;
2055: int want_reply;
2056: int success = 0;
2057:
2058: rtype = packet_get_string(NULL);
2059: want_reply = packet_get_char();
1.117 markus 2060: debug("client_input_global_request: rtype %s want_reply %d",
2061: rtype, want_reply);
1.95 markus 2062: if (want_reply) {
2063: packet_start(success ?
2064: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
2065: packet_send();
2066: packet_write_wait();
2067: }
2068: xfree(rtype);
2069: }
1.22 markus 2070:
1.123 djm 2071: void
1.129 deraadt 2072: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 2073: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 2074: {
2075: int len;
1.132 djm 2076: Channel *c = NULL;
1.123 djm 2077:
2078: debug2("%s: id %d", __func__, id);
2079:
1.132 djm 2080: if ((c = channel_lookup(id)) == NULL)
2081: fatal("client_session2_setup: channel %d: unknown channel", id);
1.224 djm 2082:
2083: packet_set_interactive(want_tty,
2084: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2085:
1.123 djm 2086: if (want_tty) {
2087: struct winsize ws;
2088:
2089: /* Store window size in the packet. */
2090: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2091: memset(&ws, 0, sizeof(ws));
2092:
1.190 djm 2093: channel_request_start(id, "pty-req", 1);
1.234 djm 2094: client_expect_confirm(id, "PTY allocation", CONFIRM_TTY);
1.123 djm 2095: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 2096: packet_put_int((u_int)ws.ws_col);
2097: packet_put_int((u_int)ws.ws_row);
2098: packet_put_int((u_int)ws.ws_xpixel);
2099: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 2100: if (tiop == NULL)
2101: tiop = get_saved_tio();
2102: tty_make_modes(-1, tiop);
1.123 djm 2103: packet_send();
2104: /* XXX wait for reply */
1.132 djm 2105: c->client_tty = 1;
1.123 djm 2106: }
2107:
2108: /* Transfer any environment variables from client to server */
1.126 djm 2109: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2110: int i, j, matched;
2111: char *name, *val;
2112:
2113: debug("Sending environment.");
1.126 djm 2114: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2115: /* Split */
1.126 djm 2116: name = xstrdup(env[i]);
1.123 djm 2117: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 2118: xfree(name);
1.123 djm 2119: continue;
2120: }
2121: *val++ = '\0';
2122:
2123: matched = 0;
2124: for (j = 0; j < options.num_send_env; j++) {
2125: if (match_pattern(name, options.send_env[j])) {
2126: matched = 1;
2127: break;
2128: }
2129: }
2130: if (!matched) {
2131: debug3("Ignored env %s", name);
1.144 stevesk 2132: xfree(name);
1.123 djm 2133: continue;
2134: }
2135:
2136: debug("Sending env %s = %s", name, val);
2137: channel_request_start(id, "env", 0);
2138: packet_put_cstring(name);
2139: packet_put_cstring(val);
2140: packet_send();
1.144 stevesk 2141: xfree(name);
1.123 djm 2142: }
2143: }
2144:
2145: len = buffer_len(cmd);
2146: if (len > 0) {
2147: if (len > 900)
2148: len = 900;
2149: if (want_subsystem) {
1.190 djm 2150: debug("Sending subsystem: %.*s",
2151: len, (u_char*)buffer_ptr(cmd));
2152: channel_request_start(id, "subsystem", 1);
1.234 djm 2153: client_expect_confirm(id, "subsystem", CONFIRM_CLOSE);
1.123 djm 2154: } else {
1.190 djm 2155: debug("Sending command: %.*s",
2156: len, (u_char*)buffer_ptr(cmd));
2157: channel_request_start(id, "exec", 1);
1.234 djm 2158: client_expect_confirm(id, "exec", CONFIRM_CLOSE);
1.123 djm 2159: }
2160: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2161: packet_send();
2162: } else {
1.190 djm 2163: channel_request_start(id, "shell", 1);
1.234 djm 2164: client_expect_confirm(id, "shell", CONFIRM_CLOSE);
1.123 djm 2165: packet_send();
2166: }
2167: }
2168:
1.77 itojun 2169: static void
1.49 itojun 2170: client_init_dispatch_20(void)
1.16 markus 2171: {
1.55 markus 2172: dispatch_init(&dispatch_protocol_error);
1.100 markus 2173:
1.16 markus 2174: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2175: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2176: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2177: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2178: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2179: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2180: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2181: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2182: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2183: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2184: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2185: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2186:
2187: /* rekeying */
2188: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2189:
2190: /* global request reply messages */
2191: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2192: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 2193: }
1.197 djm 2194:
1.77 itojun 2195: static void
1.49 itojun 2196: client_init_dispatch_13(void)
1.15 markus 2197: {
2198: dispatch_init(NULL);
2199: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2200: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2201: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2202: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2203: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2204: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2205: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2206: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2207: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2208:
2209: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2210: &client_input_agent_open : &deny_input_open);
1.39 markus 2211: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2212: &x11_input_open : &deny_input_open);
1.15 markus 2213: }
1.197 djm 2214:
1.77 itojun 2215: static void
1.49 itojun 2216: client_init_dispatch_15(void)
1.15 markus 2217: {
2218: client_init_dispatch_13();
2219: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2220: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2221: }
1.197 djm 2222:
1.79 stevesk 2223: static void
1.49 itojun 2224: client_init_dispatch(void)
1.15 markus 2225: {
1.16 markus 2226: if (compat20)
2227: client_init_dispatch_20();
2228: else if (compat13)
1.15 markus 2229: client_init_dispatch_13();
2230: else
2231: client_init_dispatch_15();
1.232 djm 2232: }
2233:
2234: void
2235: client_stop_mux(void)
2236: {
2237: if (options.control_path != NULL && muxserver_sock != -1)
2238: unlink(options.control_path);
2239: /*
1.247 dtucker 2240: * If we are in persist mode, or don't have a shell, signal that we
2241: * should close when all active channels are closed.
1.232 djm 2242: */
1.247 dtucker 2243: if (options.control_persist || no_shell_flag) {
1.232 djm 2244: session_closed = 1;
1.235 djm 2245: setproctitle("[stopped mux]");
2246: }
1.113 markus 2247: }
2248:
2249: /* client specific fatal cleanup */
2250: void
1.114 markus 2251: cleanup_exit(int i)
1.113 markus 2252: {
1.233 djm 2253: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2254: leave_non_blocking();
1.192 djm 2255: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2256: unlink(options.control_path);
1.223 djm 2257: ssh_kill_proxy_command();
1.114 markus 2258: _exit(i);
1.1 deraadt 2259: }