Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.171
1.171 ! stevesk 1: /* $OpenBSD: clientloop.c,v 1.170 2006/07/22 20:48:22 stevesk 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:
62: #include "includes.h"
1.152 stevesk 63:
64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/types.h>
66: #include <sys/stat.h>
1.166 stevesk 67: #include <sys/socket.h>
1.171 ! stevesk 68: #include <sys/time.h>
1.150 stevesk 69:
1.155 stevesk 70: #include <ctype.h>
1.168 stevesk 71: #include <errno.h>
1.151 stevesk 72: #include <paths.h>
1.153 stevesk 73: #include <signal.h>
1.170 stevesk 74: #include <string.h>
1.150 stevesk 75: #include <termios.h>
1.169 stevesk 76: #include <unistd.h>
1.1 deraadt 77:
1.45 markus 78: #include "ssh.h"
79: #include "ssh1.h"
80: #include "ssh2.h"
1.1 deraadt 81: #include "xmalloc.h"
82: #include "packet.h"
83: #include "buffer.h"
1.15 markus 84: #include "compat.h"
1.74 markus 85: #include "channels.h"
1.15 markus 86: #include "dispatch.h"
1.30 markus 87: #include "buffer.h"
88: #include "bufaux.h"
1.40 markus 89: #include "key.h"
1.54 markus 90: #include "kex.h"
1.45 markus 91: #include "log.h"
92: #include "readconf.h"
93: #include "clientloop.h"
1.147 djm 94: #include "sshconnect.h"
1.40 markus 95: #include "authfd.h"
1.45 markus 96: #include "atomicio.h"
1.118 deraadt 97: #include "sshpty.h"
1.63 markus 98: #include "misc.h"
1.123 djm 99: #include "monitor_fdpass.h"
100: #include "match.h"
101: #include "msg.h"
1.39 markus 102:
103: /* import options */
104: extern Options options;
105:
1.1 deraadt 106: /* Flag indicating that stdin should be redirected from /dev/null. */
107: extern int stdin_null_flag;
108:
1.116 dtucker 109: /* Flag indicating that no shell has been requested */
110: extern int no_shell_flag;
111:
1.123 djm 112: /* Control socket */
113: extern int control_fd;
114:
1.13 markus 115: /*
116: * Name of the host we are connecting to. This is the name given on the
117: * command line, or the HostName specified for the user-supplied name in a
118: * configuration file.
119: */
1.1 deraadt 120: extern char *host;
121:
1.13 markus 122: /*
123: * Flag to indicate that we have received a window change signal which has
124: * not yet been processed. This will cause a message indicating the new
125: * window size to be sent to the server a little later. This is volatile
126: * because this is updated in a signal handler.
127: */
1.88 markus 128: static volatile sig_atomic_t received_window_change_signal = 0;
129: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 130:
1.145 djm 131: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 132: static int in_non_blocking_mode = 0;
133:
134: /* Common data for the client loop code. */
1.162 djm 135: static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.31 markus 136: static int escape_char; /* Escape character. */
1.11 markus 137: static int escape_pending; /* Last character was the escape character */
138: static int last_was_cr; /* Last character was a newline. */
139: static int exit_status; /* Used to store the exit status of the command. */
140: static int stdin_eof; /* EOF has been encountered on standard error. */
141: static Buffer stdin_buffer; /* Buffer for stdin data. */
142: static Buffer stdout_buffer; /* Buffer for stdout data. */
143: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 144: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
145: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 146: static int connection_in; /* Connection to server (input). */
147: static int connection_out; /* Connection to server (output). */
1.56 markus 148: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 149: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 150: static int server_alive_timeouts = 0;
1.1 deraadt 151:
1.77 itojun 152: static void client_init_dispatch(void);
1.16 markus 153: int session_ident = -1;
154:
1.123 djm 155: struct confirm_ctx {
156: int want_tty;
157: int want_subsys;
1.140 djm 158: int want_x_fwd;
159: int want_agent_fwd;
1.123 djm 160: Buffer cmd;
161: char *term;
162: struct termios tio;
1.126 djm 163: char **env;
1.123 djm 164: };
165:
1.54 markus 166: /*XXX*/
167: extern Kex *xxx_kex;
168:
1.123 djm 169: void ssh_process_session2_setup(int, int, int, Buffer *);
170:
1.1 deraadt 171: /* Restores stdin to blocking mode. */
172:
1.77 itojun 173: static void
1.49 itojun 174: leave_non_blocking(void)
1.1 deraadt 175: {
1.11 markus 176: if (in_non_blocking_mode) {
1.125 djm 177: unset_nonblock(fileno(stdin));
1.11 markus 178: in_non_blocking_mode = 0;
179: }
1.1 deraadt 180: }
181:
1.11 markus 182: /* Puts stdin terminal in non-blocking mode. */
183:
1.77 itojun 184: static void
1.49 itojun 185: enter_non_blocking(void)
1.1 deraadt 186: {
1.11 markus 187: in_non_blocking_mode = 1;
1.124 djm 188: set_nonblock(fileno(stdin));
1.1 deraadt 189: }
190:
1.13 markus 191: /*
192: * Signal handler for the window change signal (SIGWINCH). This just sets a
193: * flag indicating that the window has changed.
194: */
1.157 deraadt 195: /*ARGSUSED */
1.77 itojun 196: static void
1.11 markus 197: window_change_handler(int sig)
1.1 deraadt 198: {
1.11 markus 199: received_window_change_signal = 1;
200: signal(SIGWINCH, window_change_handler);
1.1 deraadt 201: }
202:
1.13 markus 203: /*
204: * Signal handler for signals that cause the program to terminate. These
205: * signals must be trapped to restore terminal modes.
206: */
1.157 deraadt 207: /*ARGSUSED */
1.77 itojun 208: static void
1.11 markus 209: signal_handler(int sig)
1.1 deraadt 210: {
1.75 markus 211: received_signal = sig;
212: quit_pending = 1;
1.1 deraadt 213: }
214:
1.13 markus 215: /*
216: * Returns current time in seconds from Jan 1, 1970 with the maximum
217: * available resolution.
218: */
1.1 deraadt 219:
1.77 itojun 220: static double
1.49 itojun 221: get_current_time(void)
1.1 deraadt 222: {
1.11 markus 223: struct timeval tv;
224: gettimeofday(&tv, NULL);
225: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 226: }
227:
228: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
229: void
230: client_x11_get_proto(const char *display, const char *xauth_path,
231: u_int trusted, char **_proto, char **_data)
232: {
233: char cmd[1024];
234: char line[512];
235: char xdisplay[512];
236: static char proto[512], data[512];
237: FILE *f;
238: int got_data = 0, generated = 0, do_unlink = 0, i;
239: char *xauthdir, *xauthfile;
240: struct stat st;
241:
242: xauthdir = xauthfile = NULL;
243: *_proto = proto;
244: *_data = data;
245: proto[0] = data[0] = '\0';
246:
247: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
248: debug("No xauth program.");
249: } else {
250: if (display == NULL) {
251: debug("x11_get_proto: DISPLAY not set");
252: return;
253: }
254: /*
255: * Handle FamilyLocal case where $DISPLAY does
256: * not match an authorization entry. For this we
257: * just try "xauth list unix:displaynum.screennum".
258: * XXX: "localhost" match to determine FamilyLocal
259: * is not perfect.
260: */
261: if (strncmp(display, "localhost:", 10) == 0) {
262: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
263: display + 10);
264: display = xdisplay;
265: }
266: if (trusted == 0) {
267: xauthdir = xmalloc(MAXPATHLEN);
268: xauthfile = xmalloc(MAXPATHLEN);
269: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
270: if (mkdtemp(xauthdir) != NULL) {
271: do_unlink = 1;
272: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
273: xauthdir);
274: snprintf(cmd, sizeof(cmd),
275: "%s -f %s generate %s " SSH_X11_PROTO
276: " untrusted timeout 1200 2>" _PATH_DEVNULL,
277: xauth_path, xauthfile, display);
278: debug2("x11_get_proto: %s", cmd);
279: if (system(cmd) == 0)
280: generated = 1;
281: }
282: }
283: snprintf(cmd, sizeof(cmd),
1.142 markus 284: "%s %s%s list %s 2>" _PATH_DEVNULL,
1.138 djm 285: xauth_path,
286: generated ? "-f " : "" ,
287: generated ? xauthfile : "",
288: display);
289: debug2("x11_get_proto: %s", cmd);
290: f = popen(cmd, "r");
291: if (f && fgets(line, sizeof(line), f) &&
292: sscanf(line, "%*s %511s %511s", proto, data) == 2)
293: got_data = 1;
294: if (f)
295: pclose(f);
296: }
297:
298: if (do_unlink) {
299: unlink(xauthfile);
300: rmdir(xauthdir);
301: }
302: if (xauthdir)
303: xfree(xauthdir);
304: if (xauthfile)
305: xfree(xauthfile);
306:
307: /*
308: * If we didn't get authentication data, just make up some
309: * data. The forwarding code will check the validity of the
310: * response anyway, and substitute this data. The X11
311: * server, however, will ignore this fake data and use
312: * whatever authentication mechanisms it was using otherwise
313: * for the local connection.
314: */
315: if (!got_data) {
316: u_int32_t rnd = 0;
317:
318: logit("Warning: No xauth data; "
319: "using fake authentication data for X11 forwarding.");
320: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
321: for (i = 0; i < 16; i++) {
322: if (i % 4 == 0)
323: rnd = arc4random();
324: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
325: rnd & 0xff);
326: rnd >>= 8;
327: }
328: }
1.1 deraadt 329: }
330:
1.13 markus 331: /*
332: * This is called when the interactive is entered. This checks if there is
333: * an EOF coming on stdin. We must check this explicitly, as select() does
334: * not appear to wake up when redirecting from /dev/null.
335: */
1.1 deraadt 336:
1.77 itojun 337: static void
1.49 itojun 338: client_check_initial_eof_on_stdin(void)
1.1 deraadt 339: {
1.11 markus 340: int len;
341: char buf[1];
1.1 deraadt 342:
1.13 markus 343: /*
344: * If standard input is to be "redirected from /dev/null", we simply
345: * mark that we have seen an EOF and send an EOF message to the
346: * server. Otherwise, we try to read a single character; it appears
347: * that for some files, such /dev/null, select() never wakes up for
348: * read for this descriptor, which means that we never get EOF. This
349: * way we will get the EOF if stdin comes from /dev/null or similar.
350: */
1.11 markus 351: if (stdin_null_flag) {
352: /* Fake EOF on stdin. */
353: debug("Sending eof.");
354: stdin_eof = 1;
355: packet_start(SSH_CMSG_EOF);
356: packet_send();
357: } else {
358: enter_non_blocking();
359:
360: /* Check for immediate EOF on stdin. */
361: len = read(fileno(stdin), buf, 1);
362: if (len == 0) {
1.13 markus 363: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 364: debug("Sending eof.");
365: stdin_eof = 1;
366: packet_start(SSH_CMSG_EOF);
367: packet_send();
368: } else if (len > 0) {
1.13 markus 369: /*
370: * Got data. We must store the data in the buffer,
371: * and also process it as an escape character if
372: * appropriate.
373: */
1.42 markus 374: if ((u_char) buf[0] == escape_char)
1.11 markus 375: escape_pending = 1;
1.52 markus 376: else
1.11 markus 377: buffer_append(&stdin_buffer, buf, 1);
378: }
379: leave_non_blocking();
380: }
1.1 deraadt 381: }
382:
383:
1.13 markus 384: /*
385: * Make packets from buffered stdin data, and buffer them for sending to the
386: * connection.
387: */
1.1 deraadt 388:
1.77 itojun 389: static void
1.49 itojun 390: client_make_packets_from_stdin_data(void)
1.1 deraadt 391: {
1.42 markus 392: u_int len;
1.1 deraadt 393:
1.11 markus 394: /* Send buffered stdin data to the server. */
395: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 396: packet_not_very_much_data_to_write()) {
1.11 markus 397: len = buffer_len(&stdin_buffer);
398: /* Keep the packets at reasonable size. */
399: if (len > packet_get_maxsize())
400: len = packet_get_maxsize();
401: packet_start(SSH_CMSG_STDIN_DATA);
402: packet_put_string(buffer_ptr(&stdin_buffer), len);
403: packet_send();
404: buffer_consume(&stdin_buffer, len);
1.52 markus 405: stdin_bytes += len;
1.11 markus 406: /* If we have a pending EOF, send it now. */
407: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
408: packet_start(SSH_CMSG_EOF);
409: packet_send();
410: }
1.1 deraadt 411: }
412: }
413:
1.13 markus 414: /*
415: * Checks if the client window has changed, and sends a packet about it to
416: * the server if so. The actual change is detected elsewhere (by a software
417: * interrupt on Unix); this just checks the flag and sends a message if
418: * appropriate.
419: */
1.1 deraadt 420:
1.77 itojun 421: static void
1.49 itojun 422: client_check_window_change(void)
1.1 deraadt 423: {
1.16 markus 424: struct winsize ws;
425:
426: if (! received_window_change_signal)
427: return;
428: /** XXX race */
429: received_window_change_signal = 0;
430:
1.37 markus 431: debug2("client_check_window_change: changed");
1.16 markus 432:
433: if (compat20) {
1.123 djm 434: channel_send_window_changes();
1.16 markus 435: } else {
1.123 djm 436: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
437: return;
1.16 markus 438: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 439: packet_put_int((u_int)ws.ws_row);
440: packet_put_int((u_int)ws.ws_col);
441: packet_put_int((u_int)ws.ws_xpixel);
442: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 443: packet_send();
1.1 deraadt 444: }
445: }
446:
1.117 markus 447: static void
448: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
449: {
450: server_alive_timeouts = 0;
451: client_global_request_reply_fwd(type, seq, ctxt);
452: }
453:
454: static void
455: server_alive_check(void)
456: {
457: if (++server_alive_timeouts > options.server_alive_count_max)
458: packet_disconnect("Timeout, server not responding.");
459: packet_start(SSH2_MSG_GLOBAL_REQUEST);
460: packet_put_cstring("keepalive@openssh.com");
461: packet_put_char(1); /* boolean: want reply */
462: packet_send();
463: }
464:
1.13 markus 465: /*
466: * Waits until the client can do something (some data becomes available on
467: * one of the file descriptors).
468: */
1.77 itojun 469: static void
1.46 markus 470: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 471: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 472: {
1.117 markus 473: struct timeval tv, *tvp;
474: int ret;
475:
1.46 markus 476: /* Add any selections by the channel mechanism. */
1.81 markus 477: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 478:
1.16 markus 479: if (!compat20) {
1.17 markus 480: /* Read from the connection, unless our buffers are full. */
1.16 markus 481: if (buffer_len(&stdout_buffer) < buffer_high &&
482: buffer_len(&stderr_buffer) < buffer_high &&
483: channel_not_very_much_buffered_data())
1.46 markus 484: FD_SET(connection_in, *readsetp);
1.17 markus 485: /*
486: * Read from stdin, unless we have seen EOF or have very much
487: * buffered data to send to the server.
488: */
489: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 490: FD_SET(fileno(stdin), *readsetp);
1.17 markus 491:
492: /* Select stdout/stderr if have data in buffer. */
493: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 494: FD_SET(fileno(stdout), *writesetp);
1.17 markus 495: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 496: FD_SET(fileno(stderr), *writesetp);
1.16 markus 497: } else {
1.71 markus 498: /* channel_prepare_select could have closed the last channel */
1.84 markus 499: if (session_closed && !channel_still_open() &&
500: !packet_have_data_to_write()) {
501: /* clear mask since we did not call select() */
1.87 markus 502: memset(*readsetp, 0, *nallocp);
503: memset(*writesetp, 0, *nallocp);
1.84 markus 504: return;
1.71 markus 505: } else {
506: FD_SET(connection_in, *readsetp);
507: }
1.16 markus 508: }
1.11 markus 509:
510: /* Select server connection if have data to write to the server. */
511: if (packet_have_data_to_write())
1.46 markus 512: FD_SET(connection_out, *writesetp);
1.11 markus 513:
1.123 djm 514: if (control_fd != -1)
515: FD_SET(control_fd, *readsetp);
516:
1.13 markus 517: /*
518: * Wait for something to happen. This will suspend the process until
519: * some selected descriptor can be read, written, or has some other
1.117 markus 520: * event pending.
1.13 markus 521: */
1.11 markus 522:
1.117 markus 523: if (options.server_alive_interval == 0 || !compat20)
524: tvp = NULL;
1.129 deraadt 525: else {
1.117 markus 526: tv.tv_sec = options.server_alive_interval;
527: tv.tv_usec = 0;
528: tvp = &tv;
529: }
530: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
531: if (ret < 0) {
1.11 markus 532: char buf[100];
1.51 markus 533:
534: /*
535: * We have to clear the select masks, because we return.
536: * We have to return, because the mainloop checks for the flags
537: * set by the signal handlers.
538: */
1.87 markus 539: memset(*readsetp, 0, *nallocp);
540: memset(*writesetp, 0, *nallocp);
1.50 deraadt 541:
1.11 markus 542: if (errno == EINTR)
543: return;
544: /* Note: we might still have data in the buffers. */
545: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
546: buffer_append(&stderr_buffer, buf, strlen(buf));
547: quit_pending = 1;
1.117 markus 548: } else if (ret == 0)
549: server_alive_check();
1.11 markus 550: }
551:
1.77 itojun 552: static void
1.31 markus 553: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 554: {
1.11 markus 555: /* Flush stdout and stderr buffers. */
1.31 markus 556: if (buffer_len(bout) > 0)
1.112 deraadt 557: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 558: if (buffer_len(berr) > 0)
1.112 deraadt 559: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 560:
561: leave_raw_mode();
562:
1.13 markus 563: /*
564: * Free (and clear) the buffer to reduce the amount of data that gets
565: * written to swap.
566: */
1.31 markus 567: buffer_free(bin);
568: buffer_free(bout);
569: buffer_free(berr);
1.11 markus 570:
571: /* Send the suspend signal to the program itself. */
572: kill(getpid(), SIGTSTP);
573:
1.132 djm 574: /* Reset window sizes in case they have changed */
575: received_window_change_signal = 1;
1.11 markus 576:
577: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 578: buffer_init(bin);
579: buffer_init(bout);
580: buffer_init(berr);
1.11 markus 581:
582: enter_raw_mode();
583: }
584:
1.77 itojun 585: static void
1.161 deraadt 586: client_process_net_input(fd_set *readset)
1.11 markus 587: {
1.17 markus 588: int len;
589: char buf[8192];
1.11 markus 590:
1.13 markus 591: /*
592: * Read input from the server, and add any such data to the buffer of
593: * the packet subsystem.
594: */
1.11 markus 595: if (FD_ISSET(connection_in, readset)) {
596: /* Read as much as possible. */
597: len = read(connection_in, buf, sizeof(buf));
598: if (len == 0) {
599: /* Received EOF. The remote host has closed the connection. */
600: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
601: host);
1.1 deraadt 602: buffer_append(&stderr_buffer, buf, strlen(buf));
603: quit_pending = 1;
604: return;
1.11 markus 605: }
1.13 markus 606: /*
607: * There is a kernel bug on Solaris that causes select to
608: * sometimes wake up even though there is no data available.
609: */
1.53 millert 610: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 611: len = 0;
612:
613: if (len < 0) {
614: /* An error has encountered. Perhaps there is a network problem. */
615: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
616: host, strerror(errno));
617: buffer_append(&stderr_buffer, buf, strlen(buf));
618: quit_pending = 1;
619: return;
620: }
621: packet_process_incoming(buf, len);
622: }
1.17 markus 623: }
1.16 markus 624:
1.97 jakob 625: static void
1.123 djm 626: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
627: {
628: int id;
629: Channel *c;
1.129 deraadt 630:
1.123 djm 631: id = packet_get_int();
632: packet_check_eom();
633:
634: if ((c = channel_lookup(id)) == NULL) {
635: error("%s: no channel for id %d", __func__, id);
636: return;
637: }
638:
639: if (type == SSH2_MSG_CHANNEL_SUCCESS)
640: debug2("Request suceeded on channel %d", id);
641: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
642: error("Request failed on channel %d", id);
643: channel_free(c);
644: }
645: }
646:
647: static void
648: client_extra_session2_setup(int id, void *arg)
649: {
650: struct confirm_ctx *cctx = arg;
1.140 djm 651: const char *display;
1.123 djm 652: Channel *c;
1.126 djm 653: int i;
1.129 deraadt 654:
1.123 djm 655: if (cctx == NULL)
656: fatal("%s: cctx == NULL", __func__);
657: if ((c = channel_lookup(id)) == NULL)
658: fatal("%s: no channel for id %d", __func__, id);
659:
1.141 djm 660: display = getenv("DISPLAY");
1.140 djm 661: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
662: char *proto, *data;
663: /* Get reasonable local authentication information. */
664: client_x11_get_proto(display, options.xauth_location,
665: options.forward_x11_trusted, &proto, &data);
666: /* Request forwarding with authentication spoofing. */
667: debug("Requesting X11 forwarding with authentication spoofing.");
668: x11_request_forwarding_with_spoofing(id, display, proto, data);
669: /* XXX wait for reply */
670: }
671:
672: if (cctx->want_agent_fwd && options.forward_agent) {
673: debug("Requesting authentication agent forwarding.");
674: channel_request_start(id, "auth-agent-req@openssh.com", 0);
675: packet_send();
676: }
677:
1.129 deraadt 678: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 679: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 680: client_subsystem_reply);
1.127 djm 681:
1.123 djm 682: c->confirm_ctx = NULL;
683: buffer_free(&cctx->cmd);
1.126 djm 684: xfree(cctx->term);
685: if (cctx->env != NULL) {
686: for (i = 0; cctx->env[i] != NULL; i++)
687: xfree(cctx->env[i]);
688: xfree(cctx->env);
1.129 deraadt 689: }
1.126 djm 690: xfree(cctx);
1.123 djm 691: }
692:
693: static void
1.161 deraadt 694: client_process_control(fd_set *readset)
1.123 djm 695: {
696: Buffer m;
697: Channel *c;
1.139 djm 698: int client_fd, new_fd[3], ver, allowed;
1.123 djm 699: socklen_t addrlen;
700: struct sockaddr_storage addr;
701: struct confirm_ctx *cctx;
702: char *cmd;
1.139 djm 703: u_int i, len, env_len, command, flags;
1.123 djm 704: uid_t euid;
705: gid_t egid;
706:
707: /*
708: * Accept connection on control socket
709: */
710: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
711: return;
712:
713: memset(&addr, 0, sizeof(addr));
714: addrlen = sizeof(addr);
715: if ((client_fd = accept(control_fd,
716: (struct sockaddr*)&addr, &addrlen)) == -1) {
717: error("%s accept: %s", __func__, strerror(errno));
718: return;
719: }
720:
721: if (getpeereid(client_fd, &euid, &egid) < 0) {
722: error("%s getpeereid failed: %s", __func__, strerror(errno));
723: close(client_fd);
724: return;
725: }
726: if ((euid != 0) && (getuid() != euid)) {
727: error("control mode uid mismatch: peer euid %u != uid %u",
728: (u_int) euid, (u_int) getuid());
729: close(client_fd);
730: return;
731: }
1.127 djm 732:
1.134 djm 733: unset_nonblock(client_fd);
734:
735: /* Read command */
736: buffer_init(&m);
737: if (ssh_msg_recv(client_fd, &m) == -1) {
738: error("%s: client msg_recv failed", __func__);
739: close(client_fd);
740: buffer_free(&m);
741: return;
742: }
1.140 djm 743: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 744: error("%s: wrong client version %d", __func__, ver);
745: buffer_free(&m);
746: close(client_fd);
747: return;
748: }
749:
1.127 djm 750: allowed = 1;
1.134 djm 751: command = buffer_get_int(&m);
752: flags = buffer_get_int(&m);
1.123 djm 753:
1.134 djm 754: buffer_clear(&m);
1.123 djm 755:
1.134 djm 756: switch (command) {
757: case SSHMUX_COMMAND_OPEN:
1.137 djm 758: if (options.control_master == SSHCTL_MASTER_ASK ||
759: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 760: allowed = ask_permission("Allow shared connection "
761: "to %s? ", host);
762: /* continue below */
763: break;
764: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 765: if (options.control_master == SSHCTL_MASTER_ASK ||
766: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 767: allowed = ask_permission("Terminate shared connection "
768: "to %s? ", host);
769: if (allowed)
770: quit_pending = 1;
1.136 deraadt 771: /* FALLTHROUGH */
1.134 djm 772: case SSHMUX_COMMAND_ALIVE_CHECK:
773: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
774: buffer_clear(&m);
775: buffer_put_int(&m, allowed);
776: buffer_put_int(&m, getpid());
1.140 djm 777: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 778: error("%s: client msg_send failed", __func__);
779: close(client_fd);
780: buffer_free(&m);
781: return;
782: }
783: buffer_free(&m);
784: close(client_fd);
785: return;
786: default:
787: error("Unsupported command %d", command);
788: buffer_free(&m);
789: close(client_fd);
790: return;
791: }
1.123 djm 792:
1.134 djm 793: /* Reply for SSHMUX_COMMAND_OPEN */
794: buffer_clear(&m);
1.127 djm 795: buffer_put_int(&m, allowed);
1.123 djm 796: buffer_put_int(&m, getpid());
1.140 djm 797: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 798: error("%s: client msg_send failed", __func__);
799: close(client_fd);
1.127 djm 800: buffer_free(&m);
1.123 djm 801: return;
802: }
803:
1.127 djm 804: if (!allowed) {
805: error("Refused control connection");
806: close(client_fd);
807: buffer_free(&m);
808: return;
809: }
810:
1.134 djm 811: buffer_clear(&m);
1.123 djm 812: if (ssh_msg_recv(client_fd, &m) == -1) {
813: error("%s: client msg_recv failed", __func__);
814: close(client_fd);
1.127 djm 815: buffer_free(&m);
1.123 djm 816: return;
817: }
1.140 djm 818: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 819: error("%s: wrong client version %d", __func__, ver);
820: buffer_free(&m);
821: close(client_fd);
822: return;
823: }
824:
1.159 djm 825: cctx = xcalloc(1, sizeof(*cctx));
1.134 djm 826: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
827: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 828: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
829: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 830: cctx->term = buffer_get_string(&m, &len);
831:
832: cmd = buffer_get_string(&m, &len);
833: buffer_init(&cctx->cmd);
834: buffer_append(&cctx->cmd, cmd, strlen(cmd));
835:
1.126 djm 836: env_len = buffer_get_int(&m);
837: env_len = MIN(env_len, 4096);
838: debug3("%s: receiving %d env vars", __func__, env_len);
839: if (env_len != 0) {
1.159 djm 840: cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
1.126 djm 841: for (i = 0; i < env_len; i++)
842: cctx->env[i] = buffer_get_string(&m, &len);
843: cctx->env[i] = NULL;
844: }
845:
1.123 djm 846: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
847: cctx->want_tty, cctx->want_subsys, cmd);
1.163 markus 848: xfree(cmd);
1.123 djm 849:
850: /* Gather fds from client */
851: new_fd[0] = mm_receive_fd(client_fd);
852: new_fd[1] = mm_receive_fd(client_fd);
853: new_fd[2] = mm_receive_fd(client_fd);
854:
855: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
856: new_fd[0], new_fd[1], new_fd[2]);
857:
858: /* Try to pick up ttymodes from client before it goes raw */
859: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
860: error("%s: tcgetattr: %s", __func__, strerror(errno));
861:
1.134 djm 862: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 863: buffer_clear(&m);
1.140 djm 864: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 865: error("%s: client msg_send failed", __func__);
866: close(client_fd);
867: close(new_fd[0]);
868: close(new_fd[1]);
869: close(new_fd[2]);
1.127 djm 870: buffer_free(&m);
1.134 djm 871: xfree(cctx->term);
872: if (env_len != 0) {
873: for (i = 0; i < env_len; i++)
874: xfree(cctx->env[i]);
875: xfree(cctx->env);
876: }
1.123 djm 877: return;
878: }
879: buffer_free(&m);
880:
881: /* enable nonblocking unless tty */
882: if (!isatty(new_fd[0]))
883: set_nonblock(new_fd[0]);
884: if (!isatty(new_fd[1]))
885: set_nonblock(new_fd[1]);
886: if (!isatty(new_fd[2]))
887: set_nonblock(new_fd[2]);
888:
889: set_nonblock(client_fd);
890:
1.129 deraadt 891: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 892: new_fd[0], new_fd[1], new_fd[2],
893: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
894: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
895:
896: /* XXX */
897: c->ctl_fd = client_fd;
898:
899: debug3("%s: channel_new: %d", __func__, c->self);
900:
901: channel_send_open(c->self);
902: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
903: }
904:
905: static void
1.99 markus 906: process_cmdline(void)
1.97 jakob 907: {
908: void (*handler)(int);
1.135 djm 909: char *s, *cmd, *cancel_host;
1.121 djm 910: int delete = 0;
1.97 jakob 911: int local = 0;
1.135 djm 912: u_short cancel_port;
913: Forward fwd;
1.97 jakob 914:
915: leave_raw_mode();
1.101 markus 916: handler = signal(SIGINT, SIG_IGN);
1.99 markus 917: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 918: if (s == NULL)
919: goto out;
920: while (*s && isspace(*s))
921: s++;
1.121 djm 922: if (*s == '-')
923: s++; /* Skip cmdline '-', if any */
1.120 dtucker 924: if (*s == '\0')
1.97 jakob 925: goto out;
1.121 djm 926:
1.122 djm 927: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 928: logit("Commands:");
1.164 djm 929: logit(" -L[bind_address:]port:host:hostport "
930: "Request local forward");
931: logit(" -R[bind_address:]port:host:hostport "
932: "Request remote forward");
1.165 stevesk 933: logit(" -KR[bind_address:]port "
1.164 djm 934: "Cancel remote forward");
1.146 reyk 935: if (!options.permit_local_command)
936: goto out;
1.164 djm 937: logit(" !args "
938: "Execute local command");
1.146 reyk 939: goto out;
940: }
941:
942: if (*s == '!' && options.permit_local_command) {
943: s++;
944: ssh_local_cmd(s);
1.121 djm 945: goto out;
946: }
947:
948: if (*s == 'K') {
949: delete = 1;
950: s++;
951: }
952: if (*s != 'L' && *s != 'R') {
1.109 itojun 953: logit("Invalid command.");
1.97 jakob 954: goto out;
955: }
1.121 djm 956: if (*s == 'L')
1.97 jakob 957: local = 1;
1.121 djm 958: if (local && delete) {
959: logit("Not supported.");
960: goto out;
961: }
962: if ((!local || delete) && !compat20) {
1.109 itojun 963: logit("Not supported for SSH protocol version 1.");
1.97 jakob 964: goto out;
965: }
1.121 djm 966:
967: s++;
1.97 jakob 968: while (*s && isspace(*s))
969: s++;
970:
1.121 djm 971: if (delete) {
1.135 djm 972: cancel_port = 0;
973: cancel_host = hpdelim(&s); /* may be NULL */
974: if (s != NULL) {
975: cancel_port = a2port(s);
976: cancel_host = cleanhostname(cancel_host);
977: } else {
978: cancel_port = a2port(cancel_host);
979: cancel_host = NULL;
1.121 djm 980: }
1.135 djm 981: if (cancel_port == 0) {
982: logit("Bad forwarding close port");
1.121 djm 983: goto out;
984: }
1.135 djm 985: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 986: } else {
1.135 djm 987: if (!parse_forward(&fwd, s)) {
1.121 djm 988: logit("Bad forwarding specification.");
989: goto out;
990: }
991: if (local) {
1.135 djm 992: if (channel_setup_local_fwd_listener(fwd.listen_host,
993: fwd.listen_port, fwd.connect_host,
994: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 995: logit("Port forwarding failed.");
996: goto out;
997: }
1.135 djm 998: } else {
1.167 markus 999: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 1000: fwd.listen_port, fwd.connect_host,
1.167 markus 1001: fwd.connect_port) < 0) {
1002: logit("Port forwarding failed.");
1003: goto out;
1004: }
1.135 djm 1005: }
1006:
1.121 djm 1007: logit("Forwarding port.");
1008: }
1009:
1.97 jakob 1010: out:
1011: signal(SIGINT, handler);
1012: enter_raw_mode();
1013: if (cmd)
1014: xfree(cmd);
1015: }
1016:
1.31 markus 1017: /* process the characters one by one */
1.77 itojun 1018: static int
1.31 markus 1019: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1020: {
1.32 markus 1021: char string[1024];
1.31 markus 1022: pid_t pid;
1023: int bytes = 0;
1.42 markus 1024: u_int i;
1025: u_char ch;
1.31 markus 1026: char *s;
1027:
1.139 djm 1028: if (len <= 0)
1029: return (0);
1030:
1031: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1032: /* Get one character at a time. */
1033: ch = buf[i];
1034:
1035: if (escape_pending) {
1036: /* We have previously seen an escape character. */
1037: /* Clear the flag now. */
1038: escape_pending = 0;
1039:
1040: /* Process the escaped character. */
1041: switch (ch) {
1042: case '.':
1043: /* Terminate the connection. */
1.32 markus 1044: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1045: buffer_append(berr, string, strlen(string));
1.31 markus 1046:
1047: quit_pending = 1;
1048: return -1;
1049:
1050: case 'Z' - 64:
1051: /* Suspend the program. */
1052: /* Print a message to that effect to the user. */
1.32 markus 1053: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1054: buffer_append(berr, string, strlen(string));
1.31 markus 1055:
1056: /* Restore terminal modes and suspend. */
1057: client_suspend_self(bin, bout, berr);
1058:
1059: /* We have been continued. */
1060: continue;
1061:
1.111 markus 1062: case 'B':
1063: if (compat20) {
1064: snprintf(string, sizeof string,
1065: "%cB\r\n", escape_char);
1066: buffer_append(berr, string,
1067: strlen(string));
1068: channel_request_start(session_ident,
1069: "break", 0);
1070: packet_put_int(1000);
1071: packet_send();
1072: }
1073: continue;
1074:
1.54 markus 1075: case 'R':
1.59 markus 1076: if (compat20) {
1077: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1078: logit("Server does not support re-keying");
1.59 markus 1079: else
1080: need_rekeying = 1;
1081: }
1.54 markus 1082: continue;
1083:
1.31 markus 1084: case '&':
1085: /*
1086: * Detach the program (continue to serve connections,
1087: * but put in background and no more new connections).
1088: */
1089: /* Restore tty modes. */
1090: leave_raw_mode();
1091:
1092: /* Stop listening for new connections. */
1.86 markus 1093: channel_stop_listening();
1.31 markus 1094:
1.86 markus 1095: snprintf(string, sizeof string,
1096: "%c& [backgrounded]\n", escape_char);
1097: buffer_append(berr, string, strlen(string));
1.31 markus 1098:
1099: /* Fork into background. */
1100: pid = fork();
1101: if (pid < 0) {
1102: error("fork: %.100s", strerror(errno));
1103: continue;
1104: }
1105: if (pid != 0) { /* This is the parent. */
1106: /* The parent just exits. */
1107: exit(0);
1108: }
1109: /* The child continues serving connections. */
1.86 markus 1110: if (compat20) {
1111: buffer_append(bin, "\004", 1);
1112: /* fake EOF on stdin */
1113: return -1;
1114: } else if (!stdin_eof) {
1115: /*
1116: * Sending SSH_CMSG_EOF alone does not always appear
1117: * to be enough. So we try to send an EOF character
1118: * first.
1119: */
1120: packet_start(SSH_CMSG_STDIN_DATA);
1121: packet_put_string("\004", 1);
1122: packet_send();
1123: /* Close stdin. */
1124: stdin_eof = 1;
1125: if (buffer_len(bin) == 0) {
1126: packet_start(SSH_CMSG_EOF);
1127: packet_send();
1128: }
1129: }
1130: continue;
1.31 markus 1131:
1132: case '?':
1.32 markus 1133: snprintf(string, sizeof string,
1.31 markus 1134: "%c?\r\n\
1135: Supported escape sequences:\r\n\
1.104 stevesk 1136: %c. - terminate connection\r\n\
1.111 markus 1137: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1138: %cC - open a command line\r\n\
1139: %cR - Request rekey (SSH protocol 2 only)\r\n\
1140: %c^Z - suspend ssh\r\n\
1141: %c# - list forwarded connections\r\n\
1142: %c& - background ssh (when waiting for connections to terminate)\r\n\
1143: %c? - this message\r\n\
1144: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1145: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1146: escape_char, escape_char, escape_char, escape_char,
1147: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1148: escape_char, escape_char, escape_char);
1.32 markus 1149: buffer_append(berr, string, strlen(string));
1.31 markus 1150: continue;
1151:
1152: case '#':
1.32 markus 1153: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1154: buffer_append(berr, string, strlen(string));
1.31 markus 1155: s = channel_open_message();
1156: buffer_append(berr, s, strlen(s));
1157: xfree(s);
1.97 jakob 1158: continue;
1159:
1160: case 'C':
1.99 markus 1161: process_cmdline();
1.31 markus 1162: continue;
1163:
1164: default:
1165: if (ch != escape_char) {
1166: buffer_put_char(bin, escape_char);
1167: bytes++;
1168: }
1169: /* Escaped characters fall through here */
1170: break;
1171: }
1172: } else {
1173: /*
1174: * The previous character was not an escape char. Check if this
1175: * is an escape.
1176: */
1177: if (last_was_cr && ch == escape_char) {
1178: /* It is. Set the flag and continue to next character. */
1179: escape_pending = 1;
1180: continue;
1181: }
1182: }
1183:
1184: /*
1185: * Normal character. Record whether it was a newline,
1186: * and append it to the buffer.
1187: */
1188: last_was_cr = (ch == '\r' || ch == '\n');
1189: buffer_put_char(bin, ch);
1190: bytes++;
1191: }
1192: return bytes;
1193: }
1194:
1.77 itojun 1195: static void
1.161 deraadt 1196: client_process_input(fd_set *readset)
1.17 markus 1197: {
1.21 deraadt 1198: int len;
1.31 markus 1199: char buf[8192];
1.16 markus 1200:
1.11 markus 1201: /* Read input from stdin. */
1202: if (FD_ISSET(fileno(stdin), readset)) {
1203: /* Read as much as possible. */
1204: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1205: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1206: return; /* we'll try again later */
1.11 markus 1207: if (len <= 0) {
1.13 markus 1208: /*
1209: * Received EOF or error. They are treated
1210: * similarly, except that an error message is printed
1211: * if it was an error condition.
1212: */
1.11 markus 1213: if (len < 0) {
1214: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1215: buffer_append(&stderr_buffer, buf, strlen(buf));
1216: }
1217: /* Mark that we have seen EOF. */
1218: stdin_eof = 1;
1.13 markus 1219: /*
1220: * Send an EOF message to the server unless there is
1221: * data in the buffer. If there is data in the
1222: * buffer, no message will be sent now. Code
1223: * elsewhere will send the EOF when the buffer
1224: * becomes empty if stdin_eof is set.
1225: */
1.11 markus 1226: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1227: packet_start(SSH_CMSG_EOF);
1228: packet_send();
1.11 markus 1229: }
1.72 stevesk 1230: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1231: /*
1232: * Normal successful read, and no escape character.
1233: * Just append the data to buffer.
1234: */
1.11 markus 1235: buffer_append(&stdin_buffer, buf, len);
1236: } else {
1.13 markus 1237: /*
1238: * Normal, successful read. But we have an escape character
1239: * and have to process the characters one by one.
1240: */
1.52 markus 1241: if (process_escapes(&stdin_buffer, &stdout_buffer,
1242: &stderr_buffer, buf, len) == -1)
1.31 markus 1243: return;
1.11 markus 1244: }
1245: }
1246: }
1247:
1.77 itojun 1248: static void
1.161 deraadt 1249: client_process_output(fd_set *writeset)
1.11 markus 1250: {
1251: int len;
1252: char buf[100];
1.1 deraadt 1253:
1.11 markus 1254: /* Write buffered output to stdout. */
1255: if (FD_ISSET(fileno(stdout), writeset)) {
1256: /* Write as much data as possible. */
1257: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1258: buffer_len(&stdout_buffer));
1.11 markus 1259: if (len <= 0) {
1.64 markus 1260: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1261: len = 0;
1262: else {
1.13 markus 1263: /*
1264: * An error or EOF was encountered. Put an
1265: * error message to stderr buffer.
1266: */
1.11 markus 1267: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1268: buffer_append(&stderr_buffer, buf, strlen(buf));
1269: quit_pending = 1;
1270: return;
1271: }
1272: }
1273: /* Consume printed data from the buffer. */
1274: buffer_consume(&stdout_buffer, len);
1.57 markus 1275: stdout_bytes += len;
1.11 markus 1276: }
1277: /* Write buffered output to stderr. */
1278: if (FD_ISSET(fileno(stderr), writeset)) {
1279: /* Write as much data as possible. */
1280: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1281: buffer_len(&stderr_buffer));
1.11 markus 1282: if (len <= 0) {
1.64 markus 1283: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1284: len = 0;
1285: else {
1.13 markus 1286: /* EOF or error, but can't even print error message. */
1.11 markus 1287: quit_pending = 1;
1288: return;
1289: }
1290: }
1291: /* Consume printed characters from the buffer. */
1292: buffer_consume(&stderr_buffer, len);
1.57 markus 1293: stderr_bytes += len;
1.11 markus 1294: }
1.1 deraadt 1295: }
1296:
1.13 markus 1297: /*
1.15 markus 1298: * Get packets from the connection input buffer, and process them as long as
1299: * there are packets available.
1300: *
1301: * Any unknown packets received during the actual
1302: * session cause the session to terminate. This is
1303: * intended to make debugging easier since no
1304: * confirmations are sent. Any compatible protocol
1305: * extensions must be negotiated during the
1306: * preparatory phase.
1307: */
1308:
1.77 itojun 1309: static void
1.49 itojun 1310: client_process_buffered_input_packets(void)
1.15 markus 1311: {
1.54 markus 1312: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1313: }
1314:
1.31 markus 1315: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1316:
1.77 itojun 1317: static int
1.31 markus 1318: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1319: {
1.31 markus 1320: /* XXX we assume c->extended is writeable */
1321: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1322: }
1323:
1.77 itojun 1324: static void
1.60 markus 1325: client_channel_closed(int id, void *arg)
1326: {
1.83 markus 1327: channel_cancel_cleanup(id);
1.60 markus 1328: session_closed = 1;
1.113 markus 1329: leave_raw_mode();
1.60 markus 1330: }
1331:
1.15 markus 1332: /*
1.13 markus 1333: * Implements the interactive session with the server. This is called after
1334: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1335: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1336: * used as an escape character for terminating or suspending the session.
1.13 markus 1337: */
1.1 deraadt 1338:
1.20 markus 1339: int
1.30 markus 1340: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1341: {
1.46 markus 1342: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1343: double start_time, total_time;
1.130 avsm 1344: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1345: u_int nalloc = 0;
1.11 markus 1346: char buf[100];
1347:
1348: debug("Entering interactive session.");
1349:
1350: start_time = get_current_time();
1351:
1352: /* Initialize variables. */
1353: escape_pending = 0;
1354: last_was_cr = 1;
1355: exit_status = -1;
1356: stdin_eof = 0;
1357: buffer_high = 64 * 1024;
1358: connection_in = packet_get_connection_in();
1359: connection_out = packet_get_connection_out();
1.46 markus 1360: max_fd = MAX(connection_in, connection_out);
1.123 djm 1361: if (control_fd != -1)
1362: max_fd = MAX(max_fd, control_fd);
1.46 markus 1363:
1364: if (!compat20) {
1.63 markus 1365: /* enable nonblocking unless tty */
1366: if (!isatty(fileno(stdin)))
1367: set_nonblock(fileno(stdin));
1368: if (!isatty(fileno(stdout)))
1369: set_nonblock(fileno(stdout));
1370: if (!isatty(fileno(stderr)))
1371: set_nonblock(fileno(stderr));
1.46 markus 1372: max_fd = MAX(max_fd, fileno(stdin));
1373: max_fd = MAX(max_fd, fileno(stdout));
1374: max_fd = MAX(max_fd, fileno(stderr));
1375: }
1.11 markus 1376: stdin_bytes = 0;
1377: stdout_bytes = 0;
1378: stderr_bytes = 0;
1379: quit_pending = 0;
1380: escape_char = escape_char_arg;
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)
1404: enter_raw_mode();
1405:
1.48 markus 1406: if (compat20) {
1407: session_ident = ssh2_chan_id;
1.72 stevesk 1408: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1409: channel_register_filter(session_ident,
1.149 reyk 1410: simple_escape_filter, NULL);
1.60 markus 1411: if (session_ident != -1)
1412: channel_register_cleanup(session_ident,
1.143 djm 1413: client_channel_closed, 0);
1.48 markus 1414: } else {
1415: /* Check if we should immediately send eof on stdin. */
1.16 markus 1416: client_check_initial_eof_on_stdin();
1.48 markus 1417: }
1.30 markus 1418:
1.11 markus 1419: /* Main loop of the client for the interactive session mode. */
1420: while (!quit_pending) {
1421:
1.13 markus 1422: /* Process buffered packets sent by the server. */
1.11 markus 1423: client_process_buffered_input_packets();
1424:
1.60 markus 1425: if (compat20 && session_closed && !channel_still_open())
1426: break;
1427:
1.56 markus 1428: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1429:
1.56 markus 1430: if (rekeying) {
1431: debug("rekeying in progress");
1432: } else {
1433: /*
1434: * Make packets of buffered stdin data, and buffer
1435: * them for sending to the server.
1436: */
1437: if (!compat20)
1438: client_make_packets_from_stdin_data();
1.11 markus 1439:
1.56 markus 1440: /*
1441: * Make packets from buffered channel data, and
1442: * enqueue them for sending to the server.
1443: */
1444: if (packet_not_very_much_data_to_write())
1445: channel_output_poll();
1.11 markus 1446:
1.56 markus 1447: /*
1448: * Check if the window size has changed, and buffer a
1449: * message about it to the server if so.
1450: */
1451: client_check_window_change();
1.11 markus 1452:
1.56 markus 1453: if (quit_pending)
1454: break;
1455: }
1.13 markus 1456: /*
1457: * Wait until we have something to do (something becomes
1458: * available on one of the descriptors).
1459: */
1.81 markus 1460: max_fd2 = max_fd;
1.56 markus 1461: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1462: &max_fd2, &nalloc, rekeying);
1.11 markus 1463:
1464: if (quit_pending)
1465: break;
1466:
1.56 markus 1467: /* Do channel operations unless rekeying in progress. */
1468: if (!rekeying) {
1469: channel_after_select(readset, writeset);
1.108 markus 1470: if (need_rekeying || packet_need_rekeying()) {
1471: debug("need rekeying");
1.56 markus 1472: xxx_kex->done = 0;
1473: kex_send_kexinit(xxx_kex);
1474: need_rekeying = 0;
1475: }
1476: }
1.11 markus 1477:
1.17 markus 1478: /* Buffer input from the connection. */
1.46 markus 1479: client_process_net_input(readset);
1.17 markus 1480:
1.123 djm 1481: /* Accept control connections. */
1482: client_process_control(readset);
1483:
1.17 markus 1484: if (quit_pending)
1485: break;
1.11 markus 1486:
1.17 markus 1487: if (!compat20) {
1488: /* Buffer data from stdin */
1.46 markus 1489: client_process_input(readset);
1.17 markus 1490: /*
1491: * Process output to stdout and stderr. Output to
1492: * the connection is processed elsewhere (above).
1493: */
1.46 markus 1494: client_process_output(writeset);
1.17 markus 1495: }
1.11 markus 1496:
1.13 markus 1497: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1498: if (FD_ISSET(connection_out, writeset))
1.11 markus 1499: packet_write_poll();
1500: }
1.46 markus 1501: if (readset)
1502: xfree(readset);
1503: if (writeset)
1504: xfree(writeset);
1.11 markus 1505:
1506: /* Terminate the session. */
1507:
1508: /* Stop watching for window change. */
1.132 djm 1509: signal(SIGWINCH, SIG_DFL);
1.11 markus 1510:
1.76 markus 1511: channel_free_all();
1.11 markus 1512:
1.75 markus 1513: if (have_pty)
1514: leave_raw_mode();
1515:
1516: /* restore blocking io */
1517: if (!isatty(fileno(stdin)))
1518: unset_nonblock(fileno(stdin));
1519: if (!isatty(fileno(stdout)))
1520: unset_nonblock(fileno(stdout));
1521: if (!isatty(fileno(stderr)))
1522: unset_nonblock(fileno(stderr));
1.116 dtucker 1523:
1524: /*
1525: * If there was no shell or command requested, there will be no remote
1526: * exit status to be returned. In that case, clear error code if the
1527: * connection was deliberately terminated at this end.
1528: */
1529: if (no_shell_flag && received_signal == SIGTERM) {
1530: received_signal = 0;
1531: exit_status = 0;
1532: }
1.75 markus 1533:
1.113 markus 1534: if (received_signal)
1.89 itojun 1535: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1536:
1.13 markus 1537: /*
1538: * In interactive mode (with pseudo tty) display a message indicating
1539: * that the connection has been closed.
1540: */
1.11 markus 1541: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1542: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1543: buffer_append(&stderr_buffer, buf, strlen(buf));
1544: }
1.70 markus 1545:
1.11 markus 1546: /* Output any buffered data for stdout. */
1.70 markus 1547: while (buffer_len(&stdout_buffer) > 0) {
1548: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1549: buffer_len(&stdout_buffer));
1.70 markus 1550: if (len <= 0) {
1.11 markus 1551: error("Write failed flushing stdout buffer.");
1.70 markus 1552: break;
1553: }
1.11 markus 1554: buffer_consume(&stdout_buffer, len);
1.57 markus 1555: stdout_bytes += len;
1.11 markus 1556: }
1557:
1558: /* Output any buffered data for stderr. */
1.70 markus 1559: while (buffer_len(&stderr_buffer) > 0) {
1560: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1561: buffer_len(&stderr_buffer));
1.70 markus 1562: if (len <= 0) {
1.11 markus 1563: error("Write failed flushing stderr buffer.");
1.70 markus 1564: break;
1565: }
1.11 markus 1566: buffer_consume(&stderr_buffer, len);
1.57 markus 1567: stderr_bytes += len;
1.11 markus 1568: }
1569:
1570: /* Clear and free any buffers. */
1571: memset(buf, 0, sizeof(buf));
1572: buffer_free(&stdin_buffer);
1573: buffer_free(&stdout_buffer);
1574: buffer_free(&stderr_buffer);
1575:
1576: /* Report bytes transferred, and transfer rates. */
1577: total_time = get_current_time() - start_time;
1578: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1579: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1580: if (total_time > 0)
1581: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1582: stdin_bytes / total_time, stdout_bytes / total_time,
1583: stderr_bytes / total_time);
1.11 markus 1584:
1585: /* Return the exit status of the program. */
1586: debug("Exit status %d", exit_status);
1587: return exit_status;
1.15 markus 1588: }
1589:
1590: /*********/
1591:
1.77 itojun 1592: static void
1.94 markus 1593: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1594: {
1.42 markus 1595: u_int data_len;
1.15 markus 1596: char *data = packet_get_string(&data_len);
1.93 markus 1597: packet_check_eom();
1.15 markus 1598: buffer_append(&stdout_buffer, data, data_len);
1599: memset(data, 0, data_len);
1600: xfree(data);
1601: }
1.77 itojun 1602: static void
1.94 markus 1603: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1604: {
1.42 markus 1605: u_int data_len;
1.15 markus 1606: char *data = packet_get_string(&data_len);
1.93 markus 1607: packet_check_eom();
1.15 markus 1608: buffer_append(&stderr_buffer, data, data_len);
1609: memset(data, 0, data_len);
1610: xfree(data);
1611: }
1.77 itojun 1612: static void
1.94 markus 1613: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1614: {
1615: exit_status = packet_get_int();
1.93 markus 1616: packet_check_eom();
1.15 markus 1617: /* Acknowledge the exit. */
1618: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1619: packet_send();
1620: /*
1621: * Must wait for packet to be sent since we are
1622: * exiting the loop.
1623: */
1624: packet_write_wait();
1625: /* Flag that we want to exit. */
1626: quit_pending = 1;
1627: }
1.115 markus 1628: static void
1629: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1630: {
1631: Channel *c = NULL;
1632: int remote_id, sock;
1633:
1634: /* Read the remote channel number from the message. */
1635: remote_id = packet_get_int();
1636: packet_check_eom();
1637:
1638: /*
1639: * Get a connection to the local authentication agent (this may again
1640: * get forwarded).
1641: */
1642: sock = ssh_get_authentication_socket();
1643:
1644: /*
1645: * If we could not connect the agent, send an error message back to
1646: * the server. This should never happen unless the agent dies,
1647: * because authentication forwarding is only enabled if we have an
1648: * agent.
1649: */
1650: if (sock >= 0) {
1651: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1652: -1, 0, 0, 0, "authentication agent connection", 1);
1653: c->remote_id = remote_id;
1654: c->force_drain = 1;
1655: }
1656: if (c == NULL) {
1657: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1658: packet_put_int(remote_id);
1659: } else {
1660: /* Send a confirmation to the remote host. */
1661: debug("Forwarding authentication connection.");
1662: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1663: packet_put_int(remote_id);
1664: packet_put_int(c->self);
1665: }
1666: packet_send();
1667: }
1.15 markus 1668:
1.77 itojun 1669: static Channel *
1.40 markus 1670: client_request_forwarded_tcpip(const char *request_type, int rchan)
1671: {
1.103 deraadt 1672: Channel *c = NULL;
1.40 markus 1673: char *listen_address, *originator_address;
1674: int listen_port, originator_port;
1.67 markus 1675: int sock;
1.40 markus 1676:
1677: /* Get rest of the packet */
1678: listen_address = packet_get_string(NULL);
1679: listen_port = packet_get_int();
1680: originator_address = packet_get_string(NULL);
1681: originator_port = packet_get_int();
1.93 markus 1682: packet_check_eom();
1.40 markus 1683:
1684: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1685: listen_address, listen_port, originator_address, originator_port);
1686:
1.80 stevesk 1687: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1688: if (sock < 0) {
1689: xfree(originator_address);
1690: xfree(listen_address);
1691: return NULL;
1692: }
1693: c = channel_new("forwarded-tcpip",
1694: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1695: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1696: originator_address, 1);
1.40 markus 1697: xfree(originator_address);
1698: xfree(listen_address);
1699: return c;
1700: }
1701:
1.103 deraadt 1702: static Channel *
1.40 markus 1703: client_request_x11(const char *request_type, int rchan)
1704: {
1705: Channel *c = NULL;
1706: char *originator;
1707: int originator_port;
1.67 markus 1708: int sock;
1.40 markus 1709:
1710: if (!options.forward_x11) {
1711: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1712: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1713: return NULL;
1714: }
1715: originator = packet_get_string(NULL);
1716: if (datafellows & SSH_BUG_X11FWD) {
1717: debug2("buggy server: x11 request w/o originator_port");
1718: originator_port = 0;
1719: } else {
1720: originator_port = packet_get_int();
1721: }
1.93 markus 1722: packet_check_eom();
1.40 markus 1723: /* XXX check permission */
1.47 markus 1724: debug("client_request_x11: request from %s %d", originator,
1725: originator_port);
1.67 markus 1726: xfree(originator);
1.40 markus 1727: sock = x11_connect_display();
1.67 markus 1728: if (sock < 0)
1729: return NULL;
1730: c = channel_new("x11",
1731: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1732: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1733: c->force_drain = 1;
1.40 markus 1734: return c;
1735: }
1736:
1.103 deraadt 1737: static Channel *
1.40 markus 1738: client_request_agent(const char *request_type, int rchan)
1739: {
1740: Channel *c = NULL;
1.67 markus 1741: int sock;
1.40 markus 1742:
1743: if (!options.forward_agent) {
1744: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1745: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1746: return NULL;
1747: }
1748: sock = ssh_get_authentication_socket();
1.67 markus 1749: if (sock < 0)
1750: return NULL;
1751: c = channel_new("authentication agent connection",
1752: SSH_CHANNEL_OPEN, sock, sock, -1,
1753: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1754: "authentication agent connection", 1);
1.82 markus 1755: c->force_drain = 1;
1.40 markus 1756: return c;
1757: }
1758:
1.22 markus 1759: /* XXXX move to generic input handler */
1.77 itojun 1760: static void
1.94 markus 1761: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1762: {
1763: Channel *c = NULL;
1764: char *ctype;
1765: int rchan;
1.102 markus 1766: u_int rmaxpack, rwindow, len;
1.22 markus 1767:
1768: ctype = packet_get_string(&len);
1769: rchan = packet_get_int();
1770: rwindow = packet_get_int();
1771: rmaxpack = packet_get_int();
1772:
1.24 markus 1773: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1774: ctype, rchan, rwindow, rmaxpack);
1775:
1.40 markus 1776: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1777: c = client_request_forwarded_tcpip(ctype, rchan);
1778: } else if (strcmp(ctype, "x11") == 0) {
1779: c = client_request_x11(ctype, rchan);
1780: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1781: c = client_request_agent(ctype, rchan);
1.22 markus 1782: }
1783: /* XXX duplicate : */
1784: if (c != NULL) {
1785: debug("confirm %s", ctype);
1786: c->remote_id = rchan;
1787: c->remote_window = rwindow;
1788: c->remote_maxpacket = rmaxpack;
1.69 markus 1789: if (c->type != SSH_CHANNEL_CONNECTING) {
1790: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1791: packet_put_int(c->remote_id);
1792: packet_put_int(c->self);
1793: packet_put_int(c->local_window);
1794: packet_put_int(c->local_maxpacket);
1795: packet_send();
1796: }
1.22 markus 1797: } else {
1798: debug("failure %s", ctype);
1799: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1800: packet_put_int(rchan);
1801: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1802: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1803: packet_put_cstring("open failed");
1.66 markus 1804: packet_put_cstring("");
1805: }
1.22 markus 1806: packet_send();
1807: }
1808: xfree(ctype);
1809: }
1.77 itojun 1810: static void
1.94 markus 1811: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1812: {
1813: Channel *c = NULL;
1.123 djm 1814: int exitval, id, reply, success = 0;
1.48 markus 1815: char *rtype;
1816:
1817: id = packet_get_int();
1818: rtype = packet_get_string(NULL);
1819: reply = packet_get_char();
1820:
1821: debug("client_input_channel_req: channel %d rtype %s reply %d",
1822: id, rtype, reply);
1823:
1.128 djm 1824: if (id == -1) {
1825: error("client_input_channel_req: request for channel -1");
1826: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1827: error("client_input_channel_req: channel %d: unknown channel", id);
1828: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1829: exitval = packet_get_int();
1830: if (id == session_ident) {
1831: success = 1;
1832: exit_status = exitval;
1833: } else if (c->ctl_fd == -1) {
1834: error("client_input_channel_req: unexpected channel %d",
1835: session_ident);
1836: } else {
1837: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1838: success = 1;
1839: }
1.93 markus 1840: packet_check_eom();
1.48 markus 1841: }
1842: if (reply) {
1843: packet_start(success ?
1844: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1845: packet_put_int(id);
1.48 markus 1846: packet_send();
1847: }
1848: xfree(rtype);
1849: }
1.95 markus 1850: static void
1851: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1852: {
1853: char *rtype;
1854: int want_reply;
1855: int success = 0;
1856:
1857: rtype = packet_get_string(NULL);
1858: want_reply = packet_get_char();
1.117 markus 1859: debug("client_input_global_request: rtype %s want_reply %d",
1860: rtype, want_reply);
1.95 markus 1861: if (want_reply) {
1862: packet_start(success ?
1863: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1864: packet_send();
1865: packet_write_wait();
1866: }
1867: xfree(rtype);
1868: }
1.22 markus 1869:
1.123 djm 1870: void
1.129 deraadt 1871: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1872: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1873: dispatch_fn *subsys_repl)
1874: {
1875: int len;
1.132 djm 1876: Channel *c = NULL;
1.123 djm 1877:
1878: debug2("%s: id %d", __func__, id);
1879:
1.132 djm 1880: if ((c = channel_lookup(id)) == NULL)
1881: fatal("client_session2_setup: channel %d: unknown channel", id);
1882:
1.123 djm 1883: if (want_tty) {
1884: struct winsize ws;
1885: struct termios tio;
1886:
1887: /* Store window size in the packet. */
1888: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1889: memset(&ws, 0, sizeof(ws));
1890:
1891: channel_request_start(id, "pty-req", 0);
1892: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1893: packet_put_int((u_int)ws.ws_col);
1894: packet_put_int((u_int)ws.ws_row);
1895: packet_put_int((u_int)ws.ws_xpixel);
1896: packet_put_int((u_int)ws.ws_ypixel);
1.123 djm 1897: tio = get_saved_tio();
1898: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1899: packet_send();
1900: /* XXX wait for reply */
1.132 djm 1901: c->client_tty = 1;
1.123 djm 1902: }
1903:
1904: /* Transfer any environment variables from client to server */
1.126 djm 1905: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1906: int i, j, matched;
1907: char *name, *val;
1908:
1909: debug("Sending environment.");
1.126 djm 1910: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1911: /* Split */
1.126 djm 1912: name = xstrdup(env[i]);
1.123 djm 1913: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1914: xfree(name);
1.123 djm 1915: continue;
1916: }
1917: *val++ = '\0';
1918:
1919: matched = 0;
1920: for (j = 0; j < options.num_send_env; j++) {
1921: if (match_pattern(name, options.send_env[j])) {
1922: matched = 1;
1923: break;
1924: }
1925: }
1926: if (!matched) {
1927: debug3("Ignored env %s", name);
1.144 stevesk 1928: xfree(name);
1.123 djm 1929: continue;
1930: }
1931:
1932: debug("Sending env %s = %s", name, val);
1933: channel_request_start(id, "env", 0);
1934: packet_put_cstring(name);
1935: packet_put_cstring(val);
1936: packet_send();
1.144 stevesk 1937: xfree(name);
1.123 djm 1938: }
1939: }
1940:
1941: len = buffer_len(cmd);
1942: if (len > 0) {
1943: if (len > 900)
1944: len = 900;
1945: if (want_subsystem) {
1946: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1947: channel_request_start(id, "subsystem", subsys_repl != NULL);
1948: if (subsys_repl != NULL) {
1949: /* register callback for reply */
1950: /* XXX we assume that client_loop has already been called */
1951: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1952: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1953: }
1954: } else {
1955: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1956: channel_request_start(id, "exec", 0);
1957: }
1958: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1959: packet_send();
1960: } else {
1961: channel_request_start(id, "shell", 0);
1962: packet_send();
1963: }
1964: }
1965:
1.77 itojun 1966: static void
1.49 itojun 1967: client_init_dispatch_20(void)
1.16 markus 1968: {
1.55 markus 1969: dispatch_init(&dispatch_protocol_error);
1.100 markus 1970:
1.16 markus 1971: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1972: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1973: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1974: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1975: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1976: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1977: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1978: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1979: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1980: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1981:
1982: /* rekeying */
1983: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1984:
1985: /* global request reply messages */
1986: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1987: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1988: }
1.77 itojun 1989: static void
1.49 itojun 1990: client_init_dispatch_13(void)
1.15 markus 1991: {
1992: dispatch_init(NULL);
1993: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1994: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1995: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1996: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1997: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1998: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1999: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2000: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2001: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2002:
2003: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2004: &client_input_agent_open : &deny_input_open);
1.39 markus 2005: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2006: &x11_input_open : &deny_input_open);
1.15 markus 2007: }
1.77 itojun 2008: static void
1.49 itojun 2009: client_init_dispatch_15(void)
1.15 markus 2010: {
2011: client_init_dispatch_13();
2012: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2013: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2014: }
1.79 stevesk 2015: static void
1.49 itojun 2016: client_init_dispatch(void)
1.15 markus 2017: {
1.16 markus 2018: if (compat20)
2019: client_init_dispatch_20();
2020: else if (compat13)
1.15 markus 2021: client_init_dispatch_13();
2022: else
2023: client_init_dispatch_15();
1.113 markus 2024: }
2025:
2026: /* client specific fatal cleanup */
2027: void
1.114 markus 2028: cleanup_exit(int i)
1.113 markus 2029: {
2030: leave_raw_mode();
2031: leave_non_blocking();
1.123 djm 2032: if (options.control_path != NULL && control_fd != -1)
2033: unlink(options.control_path);
1.114 markus 2034: _exit(i);
1.1 deraadt 2035: }
![[BACK]](/icons/back.gif){kind=icon}
Return to clientloop.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh