Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.140
1.1 deraadt 1: /*
1.12 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
1.33 deraadt 5: * The main loop for the interactive session (client side).
1.20 markus 6: *
1.33 deraadt 7: * As far as I am concerned, the code I have written for this software
8: * can be used freely for any purpose. Any derived versions of this
9: * software must be clearly marked as such, and if the derived work is
10: * incompatible with the protocol description in the RFC file, it must be
11: * called by a name other than "ssh" or "Secure Shell".
12: *
13: *
14: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
19: * 1. Redistributions of source code must retain the above copyright
20: * notice, this list of conditions and the following disclaimer.
21: * 2. Redistributions in binary form must reproduce the above copyright
22: * notice, this list of conditions and the following disclaimer in the
23: * documentation and/or other materials provided with the distribution.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 35: *
36: *
1.33 deraadt 37: * SSH2 support added by Markus Friedl.
1.78 markus 38: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 39: *
1.33 deraadt 40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
50: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
51: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
52: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
53: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
54: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
55: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
56: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
57: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
58: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 59: */
1.1 deraadt 60:
61: #include "includes.h"
1.140 ! djm 62: RCSID("$OpenBSD: clientloop.c,v 1.139 2005/06/17 02:44:32 djm Exp $");
1.1 deraadt 63:
1.45 markus 64: #include "ssh.h"
65: #include "ssh1.h"
66: #include "ssh2.h"
1.1 deraadt 67: #include "xmalloc.h"
68: #include "packet.h"
69: #include "buffer.h"
1.15 markus 70: #include "compat.h"
1.74 markus 71: #include "channels.h"
1.15 markus 72: #include "dispatch.h"
1.30 markus 73: #include "buffer.h"
74: #include "bufaux.h"
1.40 markus 75: #include "key.h"
1.54 markus 76: #include "kex.h"
1.45 markus 77: #include "log.h"
78: #include "readconf.h"
79: #include "clientloop.h"
1.40 markus 80: #include "authfd.h"
1.45 markus 81: #include "atomicio.h"
1.118 deraadt 82: #include "sshpty.h"
1.63 markus 83: #include "misc.h"
1.123 djm 84: #include "monitor_fdpass.h"
85: #include "match.h"
86: #include "msg.h"
1.39 markus 87:
88: /* import options */
89: extern Options options;
90:
1.1 deraadt 91: /* Flag indicating that stdin should be redirected from /dev/null. */
92: extern int stdin_null_flag;
93:
1.116 dtucker 94: /* Flag indicating that no shell has been requested */
95: extern int no_shell_flag;
96:
1.123 djm 97: /* Control socket */
98: extern int control_fd;
99:
1.13 markus 100: /*
101: * Name of the host we are connecting to. This is the name given on the
102: * command line, or the HostName specified for the user-supplied name in a
103: * configuration file.
104: */
1.1 deraadt 105: extern char *host;
106:
1.13 markus 107: /*
108: * Flag to indicate that we have received a window change signal which has
109: * not yet been processed. This will cause a message indicating the new
110: * window size to be sent to the server a little later. This is volatile
111: * because this is updated in a signal handler.
112: */
1.88 markus 113: static volatile sig_atomic_t received_window_change_signal = 0;
114: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 115:
116: /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
117: static int in_non_blocking_mode = 0;
118:
119: /* Common data for the client loop code. */
1.31 markus 120: static int quit_pending; /* Set to non-zero to quit the client loop. */
121: static int escape_char; /* Escape character. */
1.11 markus 122: static int escape_pending; /* Last character was the escape character */
123: static int last_was_cr; /* Last character was a newline. */
124: static int exit_status; /* Used to store the exit status of the command. */
125: static int stdin_eof; /* EOF has been encountered on standard error. */
126: static Buffer stdin_buffer; /* Buffer for stdin data. */
127: static Buffer stdout_buffer; /* Buffer for stdout data. */
128: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 129: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
130: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 131: static int connection_in; /* Connection to server (input). */
132: static int connection_out; /* Connection to server (output). */
1.56 markus 133: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 134: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 135: static int server_alive_timeouts = 0;
1.1 deraadt 136:
1.77 itojun 137: static void client_init_dispatch(void);
1.16 markus 138: int session_ident = -1;
139:
1.123 djm 140: struct confirm_ctx {
141: int want_tty;
142: int want_subsys;
1.140 ! djm 143: int want_x_fwd;
! 144: int want_agent_fwd;
1.123 djm 145: Buffer cmd;
146: char *term;
147: struct termios tio;
1.126 djm 148: char **env;
1.123 djm 149: };
150:
1.54 markus 151: /*XXX*/
152: extern Kex *xxx_kex;
153:
1.123 djm 154: void ssh_process_session2_setup(int, int, int, Buffer *);
155:
1.1 deraadt 156: /* Restores stdin to blocking mode. */
157:
1.77 itojun 158: static void
1.49 itojun 159: leave_non_blocking(void)
1.1 deraadt 160: {
1.11 markus 161: if (in_non_blocking_mode) {
1.125 djm 162: unset_nonblock(fileno(stdin));
1.11 markus 163: in_non_blocking_mode = 0;
164: }
1.1 deraadt 165: }
166:
1.11 markus 167: /* Puts stdin terminal in non-blocking mode. */
168:
1.77 itojun 169: static void
1.49 itojun 170: enter_non_blocking(void)
1.1 deraadt 171: {
1.11 markus 172: in_non_blocking_mode = 1;
1.124 djm 173: set_nonblock(fileno(stdin));
1.1 deraadt 174: }
175:
1.13 markus 176: /*
177: * Signal handler for the window change signal (SIGWINCH). This just sets a
178: * flag indicating that the window has changed.
179: */
1.1 deraadt 180:
1.77 itojun 181: static void
1.11 markus 182: window_change_handler(int sig)
1.1 deraadt 183: {
1.11 markus 184: received_window_change_signal = 1;
185: signal(SIGWINCH, window_change_handler);
1.1 deraadt 186: }
187:
1.13 markus 188: /*
189: * Signal handler for signals that cause the program to terminate. These
190: * signals must be trapped to restore terminal modes.
191: */
1.1 deraadt 192:
1.77 itojun 193: static void
1.11 markus 194: signal_handler(int sig)
1.1 deraadt 195: {
1.75 markus 196: received_signal = sig;
197: quit_pending = 1;
1.1 deraadt 198: }
199:
1.13 markus 200: /*
201: * Returns current time in seconds from Jan 1, 1970 with the maximum
202: * available resolution.
203: */
1.1 deraadt 204:
1.77 itojun 205: static double
1.49 itojun 206: get_current_time(void)
1.1 deraadt 207: {
1.11 markus 208: struct timeval tv;
209: gettimeofday(&tv, NULL);
210: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 211: }
212:
213: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
214: void
215: client_x11_get_proto(const char *display, const char *xauth_path,
216: u_int trusted, char **_proto, char **_data)
217: {
218: char cmd[1024];
219: char line[512];
220: char xdisplay[512];
221: static char proto[512], data[512];
222: FILE *f;
223: int got_data = 0, generated = 0, do_unlink = 0, i;
224: char *xauthdir, *xauthfile;
225: struct stat st;
226:
227: xauthdir = xauthfile = NULL;
228: *_proto = proto;
229: *_data = data;
230: proto[0] = data[0] = '\0';
231:
232: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
233: debug("No xauth program.");
234: } else {
235: if (display == NULL) {
236: debug("x11_get_proto: DISPLAY not set");
237: return;
238: }
239: /*
240: * Handle FamilyLocal case where $DISPLAY does
241: * not match an authorization entry. For this we
242: * just try "xauth list unix:displaynum.screennum".
243: * XXX: "localhost" match to determine FamilyLocal
244: * is not perfect.
245: */
246: if (strncmp(display, "localhost:", 10) == 0) {
247: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
248: display + 10);
249: display = xdisplay;
250: }
251: if (trusted == 0) {
252: xauthdir = xmalloc(MAXPATHLEN);
253: xauthfile = xmalloc(MAXPATHLEN);
254: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
255: if (mkdtemp(xauthdir) != NULL) {
256: do_unlink = 1;
257: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
258: xauthdir);
259: snprintf(cmd, sizeof(cmd),
260: "%s -f %s generate %s " SSH_X11_PROTO
261: " untrusted timeout 1200 2>" _PATH_DEVNULL,
262: xauth_path, xauthfile, display);
263: debug2("x11_get_proto: %s", cmd);
264: if (system(cmd) == 0)
265: generated = 1;
266: }
267: }
268: snprintf(cmd, sizeof(cmd),
269: "%s %s%s list %s . 2>" _PATH_DEVNULL,
270: xauth_path,
271: generated ? "-f " : "" ,
272: generated ? xauthfile : "",
273: display);
274: debug2("x11_get_proto: %s", cmd);
275: f = popen(cmd, "r");
276: if (f && fgets(line, sizeof(line), f) &&
277: sscanf(line, "%*s %511s %511s", proto, data) == 2)
278: got_data = 1;
279: if (f)
280: pclose(f);
281: }
282:
283: if (do_unlink) {
284: unlink(xauthfile);
285: rmdir(xauthdir);
286: }
287: if (xauthdir)
288: xfree(xauthdir);
289: if (xauthfile)
290: xfree(xauthfile);
291:
292: /*
293: * If we didn't get authentication data, just make up some
294: * data. The forwarding code will check the validity of the
295: * response anyway, and substitute this data. The X11
296: * server, however, will ignore this fake data and use
297: * whatever authentication mechanisms it was using otherwise
298: * for the local connection.
299: */
300: if (!got_data) {
301: u_int32_t rnd = 0;
302:
303: logit("Warning: No xauth data; "
304: "using fake authentication data for X11 forwarding.");
305: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
306: for (i = 0; i < 16; i++) {
307: if (i % 4 == 0)
308: rnd = arc4random();
309: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
310: rnd & 0xff);
311: rnd >>= 8;
312: }
313: }
1.1 deraadt 314: }
315:
1.13 markus 316: /*
317: * This is called when the interactive is entered. This checks if there is
318: * an EOF coming on stdin. We must check this explicitly, as select() does
319: * not appear to wake up when redirecting from /dev/null.
320: */
1.1 deraadt 321:
1.77 itojun 322: static void
1.49 itojun 323: client_check_initial_eof_on_stdin(void)
1.1 deraadt 324: {
1.11 markus 325: int len;
326: char buf[1];
1.1 deraadt 327:
1.13 markus 328: /*
329: * If standard input is to be "redirected from /dev/null", we simply
330: * mark that we have seen an EOF and send an EOF message to the
331: * server. Otherwise, we try to read a single character; it appears
332: * that for some files, such /dev/null, select() never wakes up for
333: * read for this descriptor, which means that we never get EOF. This
334: * way we will get the EOF if stdin comes from /dev/null or similar.
335: */
1.11 markus 336: if (stdin_null_flag) {
337: /* Fake EOF on stdin. */
338: debug("Sending eof.");
339: stdin_eof = 1;
340: packet_start(SSH_CMSG_EOF);
341: packet_send();
342: } else {
343: enter_non_blocking();
344:
345: /* Check for immediate EOF on stdin. */
346: len = read(fileno(stdin), buf, 1);
347: if (len == 0) {
1.13 markus 348: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 349: debug("Sending eof.");
350: stdin_eof = 1;
351: packet_start(SSH_CMSG_EOF);
352: packet_send();
353: } else if (len > 0) {
1.13 markus 354: /*
355: * Got data. We must store the data in the buffer,
356: * and also process it as an escape character if
357: * appropriate.
358: */
1.42 markus 359: if ((u_char) buf[0] == escape_char)
1.11 markus 360: escape_pending = 1;
1.52 markus 361: else
1.11 markus 362: buffer_append(&stdin_buffer, buf, 1);
363: }
364: leave_non_blocking();
365: }
1.1 deraadt 366: }
367:
368:
1.13 markus 369: /*
370: * Make packets from buffered stdin data, and buffer them for sending to the
371: * connection.
372: */
1.1 deraadt 373:
1.77 itojun 374: static void
1.49 itojun 375: client_make_packets_from_stdin_data(void)
1.1 deraadt 376: {
1.42 markus 377: u_int len;
1.1 deraadt 378:
1.11 markus 379: /* Send buffered stdin data to the server. */
380: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 381: packet_not_very_much_data_to_write()) {
1.11 markus 382: len = buffer_len(&stdin_buffer);
383: /* Keep the packets at reasonable size. */
384: if (len > packet_get_maxsize())
385: len = packet_get_maxsize();
386: packet_start(SSH_CMSG_STDIN_DATA);
387: packet_put_string(buffer_ptr(&stdin_buffer), len);
388: packet_send();
389: buffer_consume(&stdin_buffer, len);
1.52 markus 390: stdin_bytes += len;
1.11 markus 391: /* If we have a pending EOF, send it now. */
392: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
393: packet_start(SSH_CMSG_EOF);
394: packet_send();
395: }
1.1 deraadt 396: }
397: }
398:
1.13 markus 399: /*
400: * Checks if the client window has changed, and sends a packet about it to
401: * the server if so. The actual change is detected elsewhere (by a software
402: * interrupt on Unix); this just checks the flag and sends a message if
403: * appropriate.
404: */
1.1 deraadt 405:
1.77 itojun 406: static void
1.49 itojun 407: client_check_window_change(void)
1.1 deraadt 408: {
1.16 markus 409: struct winsize ws;
410:
411: if (! received_window_change_signal)
412: return;
413: /** XXX race */
414: received_window_change_signal = 0;
415:
1.37 markus 416: debug2("client_check_window_change: changed");
1.16 markus 417:
418: if (compat20) {
1.123 djm 419: channel_send_window_changes();
1.16 markus 420: } else {
1.123 djm 421: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
422: return;
1.16 markus 423: packet_start(SSH_CMSG_WINDOW_SIZE);
424: packet_put_int(ws.ws_row);
425: packet_put_int(ws.ws_col);
426: packet_put_int(ws.ws_xpixel);
427: packet_put_int(ws.ws_ypixel);
428: packet_send();
1.1 deraadt 429: }
430: }
431:
1.117 markus 432: static void
433: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
434: {
435: server_alive_timeouts = 0;
436: client_global_request_reply_fwd(type, seq, ctxt);
437: }
438:
439: static void
440: server_alive_check(void)
441: {
442: if (++server_alive_timeouts > options.server_alive_count_max)
443: packet_disconnect("Timeout, server not responding.");
444: packet_start(SSH2_MSG_GLOBAL_REQUEST);
445: packet_put_cstring("keepalive@openssh.com");
446: packet_put_char(1); /* boolean: want reply */
447: packet_send();
448: }
449:
1.13 markus 450: /*
451: * Waits until the client can do something (some data becomes available on
452: * one of the file descriptors).
453: */
1.77 itojun 454: static void
1.46 markus 455: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 456: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 457: {
1.117 markus 458: struct timeval tv, *tvp;
459: int ret;
460:
1.46 markus 461: /* Add any selections by the channel mechanism. */
1.81 markus 462: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 463:
1.16 markus 464: if (!compat20) {
1.17 markus 465: /* Read from the connection, unless our buffers are full. */
1.16 markus 466: if (buffer_len(&stdout_buffer) < buffer_high &&
467: buffer_len(&stderr_buffer) < buffer_high &&
468: channel_not_very_much_buffered_data())
1.46 markus 469: FD_SET(connection_in, *readsetp);
1.17 markus 470: /*
471: * Read from stdin, unless we have seen EOF or have very much
472: * buffered data to send to the server.
473: */
474: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 475: FD_SET(fileno(stdin), *readsetp);
1.17 markus 476:
477: /* Select stdout/stderr if have data in buffer. */
478: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 479: FD_SET(fileno(stdout), *writesetp);
1.17 markus 480: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 481: FD_SET(fileno(stderr), *writesetp);
1.16 markus 482: } else {
1.71 markus 483: /* channel_prepare_select could have closed the last channel */
1.84 markus 484: if (session_closed && !channel_still_open() &&
485: !packet_have_data_to_write()) {
486: /* clear mask since we did not call select() */
1.87 markus 487: memset(*readsetp, 0, *nallocp);
488: memset(*writesetp, 0, *nallocp);
1.84 markus 489: return;
1.71 markus 490: } else {
491: FD_SET(connection_in, *readsetp);
492: }
1.16 markus 493: }
1.11 markus 494:
495: /* Select server connection if have data to write to the server. */
496: if (packet_have_data_to_write())
1.46 markus 497: FD_SET(connection_out, *writesetp);
1.11 markus 498:
1.123 djm 499: if (control_fd != -1)
500: FD_SET(control_fd, *readsetp);
501:
1.13 markus 502: /*
503: * Wait for something to happen. This will suspend the process until
504: * some selected descriptor can be read, written, or has some other
1.117 markus 505: * event pending.
1.13 markus 506: */
1.11 markus 507:
1.117 markus 508: if (options.server_alive_interval == 0 || !compat20)
509: tvp = NULL;
1.129 deraadt 510: else {
1.117 markus 511: tv.tv_sec = options.server_alive_interval;
512: tv.tv_usec = 0;
513: tvp = &tv;
514: }
515: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
516: if (ret < 0) {
1.11 markus 517: char buf[100];
1.51 markus 518:
519: /*
520: * We have to clear the select masks, because we return.
521: * We have to return, because the mainloop checks for the flags
522: * set by the signal handlers.
523: */
1.87 markus 524: memset(*readsetp, 0, *nallocp);
525: memset(*writesetp, 0, *nallocp);
1.50 deraadt 526:
1.11 markus 527: if (errno == EINTR)
528: return;
529: /* Note: we might still have data in the buffers. */
530: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
531: buffer_append(&stderr_buffer, buf, strlen(buf));
532: quit_pending = 1;
1.117 markus 533: } else if (ret == 0)
534: server_alive_check();
1.11 markus 535: }
536:
1.77 itojun 537: static void
1.31 markus 538: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 539: {
1.11 markus 540: /* Flush stdout and stderr buffers. */
1.31 markus 541: if (buffer_len(bout) > 0)
1.112 deraadt 542: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 543: if (buffer_len(berr) > 0)
1.112 deraadt 544: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 545:
546: leave_raw_mode();
547:
1.13 markus 548: /*
549: * Free (and clear) the buffer to reduce the amount of data that gets
550: * written to swap.
551: */
1.31 markus 552: buffer_free(bin);
553: buffer_free(bout);
554: buffer_free(berr);
1.11 markus 555:
556: /* Send the suspend signal to the program itself. */
557: kill(getpid(), SIGTSTP);
558:
1.132 djm 559: /* Reset window sizes in case they have changed */
560: received_window_change_signal = 1;
1.11 markus 561:
562: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 563: buffer_init(bin);
564: buffer_init(bout);
565: buffer_init(berr);
1.11 markus 566:
567: enter_raw_mode();
568: }
569:
1.77 itojun 570: static void
1.17 markus 571: client_process_net_input(fd_set * readset)
1.11 markus 572: {
1.17 markus 573: int len;
574: char buf[8192];
1.11 markus 575:
1.13 markus 576: /*
577: * Read input from the server, and add any such data to the buffer of
578: * the packet subsystem.
579: */
1.11 markus 580: if (FD_ISSET(connection_in, readset)) {
581: /* Read as much as possible. */
582: len = read(connection_in, buf, sizeof(buf));
583: if (len == 0) {
584: /* Received EOF. The remote host has closed the connection. */
585: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
586: host);
1.1 deraadt 587: buffer_append(&stderr_buffer, buf, strlen(buf));
588: quit_pending = 1;
589: return;
1.11 markus 590: }
1.13 markus 591: /*
592: * There is a kernel bug on Solaris that causes select to
593: * sometimes wake up even though there is no data available.
594: */
1.53 millert 595: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 596: len = 0;
597:
598: if (len < 0) {
599: /* An error has encountered. Perhaps there is a network problem. */
600: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
601: host, strerror(errno));
602: buffer_append(&stderr_buffer, buf, strlen(buf));
603: quit_pending = 1;
604: return;
605: }
606: packet_process_incoming(buf, len);
607: }
1.17 markus 608: }
1.16 markus 609:
1.97 jakob 610: static void
1.123 djm 611: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
612: {
613: int id;
614: Channel *c;
1.129 deraadt 615:
1.123 djm 616: id = packet_get_int();
617: packet_check_eom();
618:
619: if ((c = channel_lookup(id)) == NULL) {
620: error("%s: no channel for id %d", __func__, id);
621: return;
622: }
623:
624: if (type == SSH2_MSG_CHANNEL_SUCCESS)
625: debug2("Request suceeded on channel %d", id);
626: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
627: error("Request failed on channel %d", id);
628: channel_free(c);
629: }
630: }
631:
632: static void
633: client_extra_session2_setup(int id, void *arg)
634: {
635: struct confirm_ctx *cctx = arg;
1.140 ! djm 636: const char *display;
1.123 djm 637: Channel *c;
1.126 djm 638: int i;
1.129 deraadt 639:
1.123 djm 640: if (cctx == NULL)
641: fatal("%s: cctx == NULL", __func__);
642: if ((c = channel_lookup(id)) == NULL)
643: fatal("%s: no channel for id %d", __func__, id);
644:
1.140 ! djm 645: display = getenv("DISPLAY");
! 646: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
! 647: char *proto, *data;
! 648: /* Get reasonable local authentication information. */
! 649: client_x11_get_proto(display, options.xauth_location,
! 650: options.forward_x11_trusted, &proto, &data);
! 651: /* Request forwarding with authentication spoofing. */
! 652: debug("Requesting X11 forwarding with authentication spoofing.");
! 653: x11_request_forwarding_with_spoofing(id, display, proto, data);
! 654: /* XXX wait for reply */
! 655: }
! 656:
! 657: if (cctx->want_agent_fwd && options.forward_agent) {
! 658: debug("Requesting authentication agent forwarding.");
! 659: channel_request_start(id, "auth-agent-req@openssh.com", 0);
! 660: packet_send();
! 661: }
! 662:
1.129 deraadt 663: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 664: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 665: client_subsystem_reply);
1.127 djm 666:
1.123 djm 667: c->confirm_ctx = NULL;
668: buffer_free(&cctx->cmd);
1.126 djm 669: xfree(cctx->term);
670: if (cctx->env != NULL) {
671: for (i = 0; cctx->env[i] != NULL; i++)
672: xfree(cctx->env[i]);
673: xfree(cctx->env);
1.129 deraadt 674: }
1.126 djm 675: xfree(cctx);
1.123 djm 676: }
677:
678: static void
679: client_process_control(fd_set * readset)
680: {
681: Buffer m;
682: Channel *c;
1.139 djm 683: int client_fd, new_fd[3], ver, allowed;
1.123 djm 684: socklen_t addrlen;
685: struct sockaddr_storage addr;
686: struct confirm_ctx *cctx;
687: char *cmd;
1.139 djm 688: u_int i, len, env_len, command, flags;
1.123 djm 689: uid_t euid;
690: gid_t egid;
691:
692: /*
693: * Accept connection on control socket
694: */
695: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
696: return;
697:
698: memset(&addr, 0, sizeof(addr));
699: addrlen = sizeof(addr);
700: if ((client_fd = accept(control_fd,
701: (struct sockaddr*)&addr, &addrlen)) == -1) {
702: error("%s accept: %s", __func__, strerror(errno));
703: return;
704: }
705:
706: if (getpeereid(client_fd, &euid, &egid) < 0) {
707: error("%s getpeereid failed: %s", __func__, strerror(errno));
708: close(client_fd);
709: return;
710: }
711: if ((euid != 0) && (getuid() != euid)) {
712: error("control mode uid mismatch: peer euid %u != uid %u",
713: (u_int) euid, (u_int) getuid());
714: close(client_fd);
715: return;
716: }
1.127 djm 717:
1.134 djm 718: unset_nonblock(client_fd);
719:
720: /* Read command */
721: buffer_init(&m);
722: if (ssh_msg_recv(client_fd, &m) == -1) {
723: error("%s: client msg_recv failed", __func__);
724: close(client_fd);
725: buffer_free(&m);
726: return;
727: }
1.140 ! djm 728: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 729: error("%s: wrong client version %d", __func__, ver);
730: buffer_free(&m);
731: close(client_fd);
732: return;
733: }
734:
1.127 djm 735: allowed = 1;
1.134 djm 736: command = buffer_get_int(&m);
737: flags = buffer_get_int(&m);
1.123 djm 738:
1.134 djm 739: buffer_clear(&m);
1.123 djm 740:
1.134 djm 741: switch (command) {
742: case SSHMUX_COMMAND_OPEN:
1.137 djm 743: if (options.control_master == SSHCTL_MASTER_ASK ||
744: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 745: allowed = ask_permission("Allow shared connection "
746: "to %s? ", host);
747: /* continue below */
748: break;
749: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 750: if (options.control_master == SSHCTL_MASTER_ASK ||
751: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 752: allowed = ask_permission("Terminate shared connection "
753: "to %s? ", host);
754: if (allowed)
755: quit_pending = 1;
1.136 deraadt 756: /* FALLTHROUGH */
1.134 djm 757: case SSHMUX_COMMAND_ALIVE_CHECK:
758: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
759: buffer_clear(&m);
760: buffer_put_int(&m, allowed);
761: buffer_put_int(&m, getpid());
1.140 ! djm 762: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 763: error("%s: client msg_send failed", __func__);
764: close(client_fd);
765: buffer_free(&m);
766: return;
767: }
768: buffer_free(&m);
769: close(client_fd);
770: return;
771: default:
772: error("Unsupported command %d", command);
773: buffer_free(&m);
774: close(client_fd);
775: return;
776: }
1.123 djm 777:
1.134 djm 778: /* Reply for SSHMUX_COMMAND_OPEN */
779: buffer_clear(&m);
1.127 djm 780: buffer_put_int(&m, allowed);
1.123 djm 781: buffer_put_int(&m, getpid());
1.140 ! djm 782: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 783: error("%s: client msg_send failed", __func__);
784: close(client_fd);
1.127 djm 785: buffer_free(&m);
1.123 djm 786: return;
787: }
788:
1.127 djm 789: if (!allowed) {
790: error("Refused control connection");
791: close(client_fd);
792: buffer_free(&m);
793: return;
794: }
795:
1.134 djm 796: buffer_clear(&m);
1.123 djm 797: if (ssh_msg_recv(client_fd, &m) == -1) {
798: error("%s: client msg_recv failed", __func__);
799: close(client_fd);
1.127 djm 800: buffer_free(&m);
1.123 djm 801: return;
802: }
1.140 ! djm 803: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 804: error("%s: wrong client version %d", __func__, ver);
805: buffer_free(&m);
806: close(client_fd);
807: return;
808: }
809:
810: cctx = xmalloc(sizeof(*cctx));
811: memset(cctx, 0, sizeof(*cctx));
1.134 djm 812: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
813: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 ! djm 814: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
! 815: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 816: cctx->term = buffer_get_string(&m, &len);
817:
818: cmd = buffer_get_string(&m, &len);
819: buffer_init(&cctx->cmd);
820: buffer_append(&cctx->cmd, cmd, strlen(cmd));
821:
1.126 djm 822: env_len = buffer_get_int(&m);
823: env_len = MIN(env_len, 4096);
824: debug3("%s: receiving %d env vars", __func__, env_len);
825: if (env_len != 0) {
826: cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
827: for (i = 0; i < env_len; i++)
828: cctx->env[i] = buffer_get_string(&m, &len);
829: cctx->env[i] = NULL;
830: }
831:
1.123 djm 832: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
833: cctx->want_tty, cctx->want_subsys, cmd);
834:
835: /* Gather fds from client */
836: new_fd[0] = mm_receive_fd(client_fd);
837: new_fd[1] = mm_receive_fd(client_fd);
838: new_fd[2] = mm_receive_fd(client_fd);
839:
840: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
841: new_fd[0], new_fd[1], new_fd[2]);
842:
843: /* Try to pick up ttymodes from client before it goes raw */
844: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
845: error("%s: tcgetattr: %s", __func__, strerror(errno));
846:
1.134 djm 847: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 848: buffer_clear(&m);
1.140 ! djm 849: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 850: error("%s: client msg_send failed", __func__);
851: close(client_fd);
852: close(new_fd[0]);
853: close(new_fd[1]);
854: close(new_fd[2]);
1.127 djm 855: buffer_free(&m);
1.134 djm 856: xfree(cctx->term);
857: if (env_len != 0) {
858: for (i = 0; i < env_len; i++)
859: xfree(cctx->env[i]);
860: xfree(cctx->env);
861: }
1.123 djm 862: return;
863: }
864: buffer_free(&m);
865:
866: /* enable nonblocking unless tty */
867: if (!isatty(new_fd[0]))
868: set_nonblock(new_fd[0]);
869: if (!isatty(new_fd[1]))
870: set_nonblock(new_fd[1]);
871: if (!isatty(new_fd[2]))
872: set_nonblock(new_fd[2]);
873:
874: set_nonblock(client_fd);
875:
1.129 deraadt 876: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 877: new_fd[0], new_fd[1], new_fd[2],
878: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
879: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
880:
881: /* XXX */
882: c->ctl_fd = client_fd;
883:
884: debug3("%s: channel_new: %d", __func__, c->self);
885:
886: channel_send_open(c->self);
887: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
888: }
889:
890: static void
1.99 markus 891: process_cmdline(void)
1.97 jakob 892: {
893: void (*handler)(int);
1.135 djm 894: char *s, *cmd, *cancel_host;
1.121 djm 895: int delete = 0;
1.97 jakob 896: int local = 0;
1.135 djm 897: u_short cancel_port;
898: Forward fwd;
1.97 jakob 899:
900: leave_raw_mode();
1.101 markus 901: handler = signal(SIGINT, SIG_IGN);
1.99 markus 902: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 903: if (s == NULL)
904: goto out;
905: while (*s && isspace(*s))
906: s++;
1.121 djm 907: if (*s == '-')
908: s++; /* Skip cmdline '-', if any */
1.120 dtucker 909: if (*s == '\0')
1.97 jakob 910: goto out;
1.121 djm 911:
1.122 djm 912: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 913: logit("Commands:");
914: logit(" -Lport:host:hostport Request local forward");
915: logit(" -Rport:host:hostport Request remote forward");
916: logit(" -KRhostport Cancel remote forward");
917: goto out;
918: }
919:
920: if (*s == 'K') {
921: delete = 1;
922: s++;
923: }
924: if (*s != 'L' && *s != 'R') {
1.109 itojun 925: logit("Invalid command.");
1.97 jakob 926: goto out;
927: }
1.121 djm 928: if (*s == 'L')
1.97 jakob 929: local = 1;
1.121 djm 930: if (local && delete) {
931: logit("Not supported.");
932: goto out;
933: }
934: if ((!local || delete) && !compat20) {
1.109 itojun 935: logit("Not supported for SSH protocol version 1.");
1.97 jakob 936: goto out;
937: }
1.121 djm 938:
939: s++;
1.97 jakob 940: while (*s && isspace(*s))
941: s++;
942:
1.121 djm 943: if (delete) {
1.135 djm 944: cancel_port = 0;
945: cancel_host = hpdelim(&s); /* may be NULL */
946: if (s != NULL) {
947: cancel_port = a2port(s);
948: cancel_host = cleanhostname(cancel_host);
949: } else {
950: cancel_port = a2port(cancel_host);
951: cancel_host = NULL;
1.121 djm 952: }
1.135 djm 953: if (cancel_port == 0) {
954: logit("Bad forwarding close port");
1.121 djm 955: goto out;
956: }
1.135 djm 957: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 958: } else {
1.135 djm 959: if (!parse_forward(&fwd, s)) {
1.121 djm 960: logit("Bad forwarding specification.");
961: goto out;
962: }
963: if (local) {
1.135 djm 964: if (channel_setup_local_fwd_listener(fwd.listen_host,
965: fwd.listen_port, fwd.connect_host,
966: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 967: logit("Port forwarding failed.");
968: goto out;
969: }
1.135 djm 970: } else {
971: channel_request_remote_forwarding(fwd.listen_host,
972: fwd.listen_port, fwd.connect_host,
973: fwd.connect_port);
974: }
975:
1.121 djm 976: logit("Forwarding port.");
977: }
978:
1.97 jakob 979: out:
980: signal(SIGINT, handler);
981: enter_raw_mode();
982: if (cmd)
983: xfree(cmd);
984: }
985:
1.31 markus 986: /* process the characters one by one */
1.77 itojun 987: static int
1.31 markus 988: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
989: {
1.32 markus 990: char string[1024];
1.31 markus 991: pid_t pid;
992: int bytes = 0;
1.42 markus 993: u_int i;
994: u_char ch;
1.31 markus 995: char *s;
996:
1.139 djm 997: if (len <= 0)
998: return (0);
999:
1000: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1001: /* Get one character at a time. */
1002: ch = buf[i];
1003:
1004: if (escape_pending) {
1005: /* We have previously seen an escape character. */
1006: /* Clear the flag now. */
1007: escape_pending = 0;
1008:
1009: /* Process the escaped character. */
1010: switch (ch) {
1011: case '.':
1012: /* Terminate the connection. */
1.32 markus 1013: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1014: buffer_append(berr, string, strlen(string));
1.31 markus 1015:
1016: quit_pending = 1;
1017: return -1;
1018:
1019: case 'Z' - 64:
1020: /* Suspend the program. */
1021: /* Print a message to that effect to the user. */
1.32 markus 1022: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1023: buffer_append(berr, string, strlen(string));
1.31 markus 1024:
1025: /* Restore terminal modes and suspend. */
1026: client_suspend_self(bin, bout, berr);
1027:
1028: /* We have been continued. */
1029: continue;
1030:
1.111 markus 1031: case 'B':
1032: if (compat20) {
1033: snprintf(string, sizeof string,
1034: "%cB\r\n", escape_char);
1035: buffer_append(berr, string,
1036: strlen(string));
1037: channel_request_start(session_ident,
1038: "break", 0);
1039: packet_put_int(1000);
1040: packet_send();
1041: }
1042: continue;
1043:
1.54 markus 1044: case 'R':
1.59 markus 1045: if (compat20) {
1046: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1047: logit("Server does not support re-keying");
1.59 markus 1048: else
1049: need_rekeying = 1;
1050: }
1.54 markus 1051: continue;
1052:
1.31 markus 1053: case '&':
1054: /*
1055: * Detach the program (continue to serve connections,
1056: * but put in background and no more new connections).
1057: */
1058: /* Restore tty modes. */
1059: leave_raw_mode();
1060:
1061: /* Stop listening for new connections. */
1.86 markus 1062: channel_stop_listening();
1.31 markus 1063:
1.86 markus 1064: snprintf(string, sizeof string,
1065: "%c& [backgrounded]\n", escape_char);
1066: buffer_append(berr, string, strlen(string));
1.31 markus 1067:
1068: /* Fork into background. */
1069: pid = fork();
1070: if (pid < 0) {
1071: error("fork: %.100s", strerror(errno));
1072: continue;
1073: }
1074: if (pid != 0) { /* This is the parent. */
1075: /* The parent just exits. */
1076: exit(0);
1077: }
1078: /* The child continues serving connections. */
1.86 markus 1079: if (compat20) {
1080: buffer_append(bin, "\004", 1);
1081: /* fake EOF on stdin */
1082: return -1;
1083: } else if (!stdin_eof) {
1084: /*
1085: * Sending SSH_CMSG_EOF alone does not always appear
1086: * to be enough. So we try to send an EOF character
1087: * first.
1088: */
1089: packet_start(SSH_CMSG_STDIN_DATA);
1090: packet_put_string("\004", 1);
1091: packet_send();
1092: /* Close stdin. */
1093: stdin_eof = 1;
1094: if (buffer_len(bin) == 0) {
1095: packet_start(SSH_CMSG_EOF);
1096: packet_send();
1097: }
1098: }
1099: continue;
1.31 markus 1100:
1101: case '?':
1.32 markus 1102: snprintf(string, sizeof string,
1.31 markus 1103: "%c?\r\n\
1104: Supported escape sequences:\r\n\
1.104 stevesk 1105: %c. - terminate connection\r\n\
1.111 markus 1106: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1107: %cC - open a command line\r\n\
1108: %cR - Request rekey (SSH protocol 2 only)\r\n\
1109: %c^Z - suspend ssh\r\n\
1110: %c# - list forwarded connections\r\n\
1111: %c& - background ssh (when waiting for connections to terminate)\r\n\
1112: %c? - this message\r\n\
1113: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1114: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1115: escape_char, escape_char, escape_char, escape_char,
1116: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1117: escape_char, escape_char, escape_char);
1.32 markus 1118: buffer_append(berr, string, strlen(string));
1.31 markus 1119: continue;
1120:
1121: case '#':
1.32 markus 1122: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1123: buffer_append(berr, string, strlen(string));
1.31 markus 1124: s = channel_open_message();
1125: buffer_append(berr, s, strlen(s));
1126: xfree(s);
1.97 jakob 1127: continue;
1128:
1129: case 'C':
1.99 markus 1130: process_cmdline();
1.31 markus 1131: continue;
1132:
1133: default:
1134: if (ch != escape_char) {
1135: buffer_put_char(bin, escape_char);
1136: bytes++;
1137: }
1138: /* Escaped characters fall through here */
1139: break;
1140: }
1141: } else {
1142: /*
1143: * The previous character was not an escape char. Check if this
1144: * is an escape.
1145: */
1146: if (last_was_cr && ch == escape_char) {
1147: /* It is. Set the flag and continue to next character. */
1148: escape_pending = 1;
1149: continue;
1150: }
1151: }
1152:
1153: /*
1154: * Normal character. Record whether it was a newline,
1155: * and append it to the buffer.
1156: */
1157: last_was_cr = (ch == '\r' || ch == '\n');
1158: buffer_put_char(bin, ch);
1159: bytes++;
1160: }
1161: return bytes;
1162: }
1163:
1.77 itojun 1164: static void
1.17 markus 1165: client_process_input(fd_set * readset)
1166: {
1.21 deraadt 1167: int len;
1.31 markus 1168: char buf[8192];
1.16 markus 1169:
1.11 markus 1170: /* Read input from stdin. */
1171: if (FD_ISSET(fileno(stdin), readset)) {
1172: /* Read as much as possible. */
1173: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1174: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1175: return; /* we'll try again later */
1.11 markus 1176: if (len <= 0) {
1.13 markus 1177: /*
1178: * Received EOF or error. They are treated
1179: * similarly, except that an error message is printed
1180: * if it was an error condition.
1181: */
1.11 markus 1182: if (len < 0) {
1183: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1184: buffer_append(&stderr_buffer, buf, strlen(buf));
1185: }
1186: /* Mark that we have seen EOF. */
1187: stdin_eof = 1;
1.13 markus 1188: /*
1189: * Send an EOF message to the server unless there is
1190: * data in the buffer. If there is data in the
1191: * buffer, no message will be sent now. Code
1192: * elsewhere will send the EOF when the buffer
1193: * becomes empty if stdin_eof is set.
1194: */
1.11 markus 1195: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1196: packet_start(SSH_CMSG_EOF);
1197: packet_send();
1.11 markus 1198: }
1.72 stevesk 1199: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1200: /*
1201: * Normal successful read, and no escape character.
1202: * Just append the data to buffer.
1203: */
1.11 markus 1204: buffer_append(&stdin_buffer, buf, len);
1205: } else {
1.13 markus 1206: /*
1207: * Normal, successful read. But we have an escape character
1208: * and have to process the characters one by one.
1209: */
1.52 markus 1210: if (process_escapes(&stdin_buffer, &stdout_buffer,
1211: &stderr_buffer, buf, len) == -1)
1.31 markus 1212: return;
1.11 markus 1213: }
1214: }
1215: }
1216:
1.77 itojun 1217: static void
1.11 markus 1218: client_process_output(fd_set * writeset)
1219: {
1220: int len;
1221: char buf[100];
1.1 deraadt 1222:
1.11 markus 1223: /* Write buffered output to stdout. */
1224: if (FD_ISSET(fileno(stdout), writeset)) {
1225: /* Write as much data as possible. */
1226: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1227: buffer_len(&stdout_buffer));
1.11 markus 1228: if (len <= 0) {
1.64 markus 1229: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1230: len = 0;
1231: else {
1.13 markus 1232: /*
1233: * An error or EOF was encountered. Put an
1234: * error message to stderr buffer.
1235: */
1.11 markus 1236: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1237: buffer_append(&stderr_buffer, buf, strlen(buf));
1238: quit_pending = 1;
1239: return;
1240: }
1241: }
1242: /* Consume printed data from the buffer. */
1243: buffer_consume(&stdout_buffer, len);
1.57 markus 1244: stdout_bytes += len;
1.11 markus 1245: }
1246: /* Write buffered output to stderr. */
1247: if (FD_ISSET(fileno(stderr), writeset)) {
1248: /* Write as much data as possible. */
1249: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1250: buffer_len(&stderr_buffer));
1.11 markus 1251: if (len <= 0) {
1.64 markus 1252: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1253: len = 0;
1254: else {
1.13 markus 1255: /* EOF or error, but can't even print error message. */
1.11 markus 1256: quit_pending = 1;
1257: return;
1258: }
1259: }
1260: /* Consume printed characters from the buffer. */
1261: buffer_consume(&stderr_buffer, len);
1.57 markus 1262: stderr_bytes += len;
1.11 markus 1263: }
1.1 deraadt 1264: }
1265:
1.13 markus 1266: /*
1.15 markus 1267: * Get packets from the connection input buffer, and process them as long as
1268: * there are packets available.
1269: *
1270: * Any unknown packets received during the actual
1271: * session cause the session to terminate. This is
1272: * intended to make debugging easier since no
1273: * confirmations are sent. Any compatible protocol
1274: * extensions must be negotiated during the
1275: * preparatory phase.
1276: */
1277:
1.77 itojun 1278: static void
1.49 itojun 1279: client_process_buffered_input_packets(void)
1.15 markus 1280: {
1.54 markus 1281: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1282: }
1283:
1.31 markus 1284: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1285:
1.77 itojun 1286: static int
1.31 markus 1287: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1288: {
1.31 markus 1289: /* XXX we assume c->extended is writeable */
1290: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1291: }
1292:
1.77 itojun 1293: static void
1.60 markus 1294: client_channel_closed(int id, void *arg)
1295: {
1.83 markus 1296: channel_cancel_cleanup(id);
1.60 markus 1297: session_closed = 1;
1.113 markus 1298: leave_raw_mode();
1.60 markus 1299: }
1300:
1.15 markus 1301: /*
1.13 markus 1302: * Implements the interactive session with the server. This is called after
1303: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1304: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1305: * used as an escape character for terminating or suspending the session.
1.13 markus 1306: */
1.1 deraadt 1307:
1.20 markus 1308: int
1.30 markus 1309: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1310: {
1.46 markus 1311: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1312: double start_time, total_time;
1.130 avsm 1313: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1314: u_int nalloc = 0;
1.11 markus 1315: char buf[100];
1316:
1317: debug("Entering interactive session.");
1318:
1319: start_time = get_current_time();
1320:
1321: /* Initialize variables. */
1322: escape_pending = 0;
1323: last_was_cr = 1;
1324: exit_status = -1;
1325: stdin_eof = 0;
1326: buffer_high = 64 * 1024;
1327: connection_in = packet_get_connection_in();
1328: connection_out = packet_get_connection_out();
1.46 markus 1329: max_fd = MAX(connection_in, connection_out);
1.123 djm 1330: if (control_fd != -1)
1331: max_fd = MAX(max_fd, control_fd);
1.46 markus 1332:
1333: if (!compat20) {
1.63 markus 1334: /* enable nonblocking unless tty */
1335: if (!isatty(fileno(stdin)))
1336: set_nonblock(fileno(stdin));
1337: if (!isatty(fileno(stdout)))
1338: set_nonblock(fileno(stdout));
1339: if (!isatty(fileno(stderr)))
1340: set_nonblock(fileno(stderr));
1.46 markus 1341: max_fd = MAX(max_fd, fileno(stdin));
1342: max_fd = MAX(max_fd, fileno(stdout));
1343: max_fd = MAX(max_fd, fileno(stderr));
1344: }
1.11 markus 1345: stdin_bytes = 0;
1346: stdout_bytes = 0;
1347: stderr_bytes = 0;
1348: quit_pending = 0;
1349: escape_char = escape_char_arg;
1350:
1351: /* Initialize buffers. */
1352: buffer_init(&stdin_buffer);
1353: buffer_init(&stdout_buffer);
1354: buffer_init(&stderr_buffer);
1355:
1.15 markus 1356: client_init_dispatch();
1357:
1.105 markus 1358: /*
1359: * Set signal handlers, (e.g. to restore non-blocking mode)
1360: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1361: */
1.131 djm 1362: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1363: signal(SIGHUP, signal_handler);
1.105 markus 1364: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1365: signal(SIGINT, signal_handler);
1366: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1367: signal(SIGQUIT, signal_handler);
1368: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1369: signal(SIGTERM, signal_handler);
1.132 djm 1370: signal(SIGWINCH, window_change_handler);
1.11 markus 1371:
1372: if (have_pty)
1373: enter_raw_mode();
1374:
1.48 markus 1375: if (compat20) {
1376: session_ident = ssh2_chan_id;
1.72 stevesk 1377: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1378: channel_register_filter(session_ident,
1379: simple_escape_filter);
1.60 markus 1380: if (session_ident != -1)
1381: channel_register_cleanup(session_ident,
1382: client_channel_closed);
1.48 markus 1383: } else {
1384: /* Check if we should immediately send eof on stdin. */
1.16 markus 1385: client_check_initial_eof_on_stdin();
1.48 markus 1386: }
1.30 markus 1387:
1.11 markus 1388: /* Main loop of the client for the interactive session mode. */
1389: while (!quit_pending) {
1390:
1.13 markus 1391: /* Process buffered packets sent by the server. */
1.11 markus 1392: client_process_buffered_input_packets();
1393:
1.60 markus 1394: if (compat20 && session_closed && !channel_still_open())
1395: break;
1396:
1.56 markus 1397: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1398:
1.56 markus 1399: if (rekeying) {
1400: debug("rekeying in progress");
1401: } else {
1402: /*
1403: * Make packets of buffered stdin data, and buffer
1404: * them for sending to the server.
1405: */
1406: if (!compat20)
1407: client_make_packets_from_stdin_data();
1.11 markus 1408:
1.56 markus 1409: /*
1410: * Make packets from buffered channel data, and
1411: * enqueue them for sending to the server.
1412: */
1413: if (packet_not_very_much_data_to_write())
1414: channel_output_poll();
1.11 markus 1415:
1.56 markus 1416: /*
1417: * Check if the window size has changed, and buffer a
1418: * message about it to the server if so.
1419: */
1420: client_check_window_change();
1.11 markus 1421:
1.56 markus 1422: if (quit_pending)
1423: break;
1424: }
1.13 markus 1425: /*
1426: * Wait until we have something to do (something becomes
1427: * available on one of the descriptors).
1428: */
1.81 markus 1429: max_fd2 = max_fd;
1.56 markus 1430: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1431: &max_fd2, &nalloc, rekeying);
1.11 markus 1432:
1433: if (quit_pending)
1434: break;
1435:
1.56 markus 1436: /* Do channel operations unless rekeying in progress. */
1437: if (!rekeying) {
1438: channel_after_select(readset, writeset);
1.108 markus 1439: if (need_rekeying || packet_need_rekeying()) {
1440: debug("need rekeying");
1.56 markus 1441: xxx_kex->done = 0;
1442: kex_send_kexinit(xxx_kex);
1443: need_rekeying = 0;
1444: }
1445: }
1.11 markus 1446:
1.17 markus 1447: /* Buffer input from the connection. */
1.46 markus 1448: client_process_net_input(readset);
1.17 markus 1449:
1.123 djm 1450: /* Accept control connections. */
1451: client_process_control(readset);
1452:
1.17 markus 1453: if (quit_pending)
1454: break;
1.11 markus 1455:
1.17 markus 1456: if (!compat20) {
1457: /* Buffer data from stdin */
1.46 markus 1458: client_process_input(readset);
1.17 markus 1459: /*
1460: * Process output to stdout and stderr. Output to
1461: * the connection is processed elsewhere (above).
1462: */
1.46 markus 1463: client_process_output(writeset);
1.17 markus 1464: }
1.11 markus 1465:
1.13 markus 1466: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1467: if (FD_ISSET(connection_out, writeset))
1.11 markus 1468: packet_write_poll();
1469: }
1.46 markus 1470: if (readset)
1471: xfree(readset);
1472: if (writeset)
1473: xfree(writeset);
1.11 markus 1474:
1475: /* Terminate the session. */
1476:
1477: /* Stop watching for window change. */
1.132 djm 1478: signal(SIGWINCH, SIG_DFL);
1.11 markus 1479:
1.76 markus 1480: channel_free_all();
1.11 markus 1481:
1.75 markus 1482: if (have_pty)
1483: leave_raw_mode();
1484:
1485: /* restore blocking io */
1486: if (!isatty(fileno(stdin)))
1487: unset_nonblock(fileno(stdin));
1488: if (!isatty(fileno(stdout)))
1489: unset_nonblock(fileno(stdout));
1490: if (!isatty(fileno(stderr)))
1491: unset_nonblock(fileno(stderr));
1.116 dtucker 1492:
1493: /*
1494: * If there was no shell or command requested, there will be no remote
1495: * exit status to be returned. In that case, clear error code if the
1496: * connection was deliberately terminated at this end.
1497: */
1498: if (no_shell_flag && received_signal == SIGTERM) {
1499: received_signal = 0;
1500: exit_status = 0;
1501: }
1.75 markus 1502:
1.113 markus 1503: if (received_signal)
1.89 itojun 1504: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1505:
1.13 markus 1506: /*
1507: * In interactive mode (with pseudo tty) display a message indicating
1508: * that the connection has been closed.
1509: */
1.11 markus 1510: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1511: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1512: buffer_append(&stderr_buffer, buf, strlen(buf));
1513: }
1.70 markus 1514:
1.11 markus 1515: /* Output any buffered data for stdout. */
1.70 markus 1516: while (buffer_len(&stdout_buffer) > 0) {
1517: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1518: buffer_len(&stdout_buffer));
1.70 markus 1519: if (len <= 0) {
1.11 markus 1520: error("Write failed flushing stdout buffer.");
1.70 markus 1521: break;
1522: }
1.11 markus 1523: buffer_consume(&stdout_buffer, len);
1.57 markus 1524: stdout_bytes += len;
1.11 markus 1525: }
1526:
1527: /* Output any buffered data for stderr. */
1.70 markus 1528: while (buffer_len(&stderr_buffer) > 0) {
1529: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1530: buffer_len(&stderr_buffer));
1.70 markus 1531: if (len <= 0) {
1.11 markus 1532: error("Write failed flushing stderr buffer.");
1.70 markus 1533: break;
1534: }
1.11 markus 1535: buffer_consume(&stderr_buffer, len);
1.57 markus 1536: stderr_bytes += len;
1.11 markus 1537: }
1538:
1539: /* Clear and free any buffers. */
1540: memset(buf, 0, sizeof(buf));
1541: buffer_free(&stdin_buffer);
1542: buffer_free(&stdout_buffer);
1543: buffer_free(&stderr_buffer);
1544:
1545: /* Report bytes transferred, and transfer rates. */
1546: total_time = get_current_time() - start_time;
1547: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1548: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1549: if (total_time > 0)
1550: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1551: stdin_bytes / total_time, stdout_bytes / total_time,
1552: stderr_bytes / total_time);
1.11 markus 1553:
1554: /* Return the exit status of the program. */
1555: debug("Exit status %d", exit_status);
1556: return exit_status;
1.15 markus 1557: }
1558:
1559: /*********/
1560:
1.77 itojun 1561: static void
1.94 markus 1562: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1563: {
1.42 markus 1564: u_int data_len;
1.15 markus 1565: char *data = packet_get_string(&data_len);
1.93 markus 1566: packet_check_eom();
1.15 markus 1567: buffer_append(&stdout_buffer, data, data_len);
1568: memset(data, 0, data_len);
1569: xfree(data);
1570: }
1.77 itojun 1571: static void
1.94 markus 1572: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1573: {
1.42 markus 1574: u_int data_len;
1.15 markus 1575: char *data = packet_get_string(&data_len);
1.93 markus 1576: packet_check_eom();
1.15 markus 1577: buffer_append(&stderr_buffer, data, data_len);
1578: memset(data, 0, data_len);
1579: xfree(data);
1580: }
1.77 itojun 1581: static void
1.94 markus 1582: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1583: {
1584: exit_status = packet_get_int();
1.93 markus 1585: packet_check_eom();
1.15 markus 1586: /* Acknowledge the exit. */
1587: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1588: packet_send();
1589: /*
1590: * Must wait for packet to be sent since we are
1591: * exiting the loop.
1592: */
1593: packet_write_wait();
1594: /* Flag that we want to exit. */
1595: quit_pending = 1;
1596: }
1.115 markus 1597: static void
1598: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1599: {
1600: Channel *c = NULL;
1601: int remote_id, sock;
1602:
1603: /* Read the remote channel number from the message. */
1604: remote_id = packet_get_int();
1605: packet_check_eom();
1606:
1607: /*
1608: * Get a connection to the local authentication agent (this may again
1609: * get forwarded).
1610: */
1611: sock = ssh_get_authentication_socket();
1612:
1613: /*
1614: * If we could not connect the agent, send an error message back to
1615: * the server. This should never happen unless the agent dies,
1616: * because authentication forwarding is only enabled if we have an
1617: * agent.
1618: */
1619: if (sock >= 0) {
1620: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1621: -1, 0, 0, 0, "authentication agent connection", 1);
1622: c->remote_id = remote_id;
1623: c->force_drain = 1;
1624: }
1625: if (c == NULL) {
1626: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1627: packet_put_int(remote_id);
1628: } else {
1629: /* Send a confirmation to the remote host. */
1630: debug("Forwarding authentication connection.");
1631: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1632: packet_put_int(remote_id);
1633: packet_put_int(c->self);
1634: }
1635: packet_send();
1636: }
1.15 markus 1637:
1.77 itojun 1638: static Channel *
1.40 markus 1639: client_request_forwarded_tcpip(const char *request_type, int rchan)
1640: {
1.103 deraadt 1641: Channel *c = NULL;
1.40 markus 1642: char *listen_address, *originator_address;
1643: int listen_port, originator_port;
1.67 markus 1644: int sock;
1.40 markus 1645:
1646: /* Get rest of the packet */
1647: listen_address = packet_get_string(NULL);
1648: listen_port = packet_get_int();
1649: originator_address = packet_get_string(NULL);
1650: originator_port = packet_get_int();
1.93 markus 1651: packet_check_eom();
1.40 markus 1652:
1653: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1654: listen_address, listen_port, originator_address, originator_port);
1655:
1.80 stevesk 1656: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1657: if (sock < 0) {
1658: xfree(originator_address);
1659: xfree(listen_address);
1660: return NULL;
1661: }
1662: c = channel_new("forwarded-tcpip",
1663: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1664: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1665: originator_address, 1);
1.40 markus 1666: xfree(originator_address);
1667: xfree(listen_address);
1668: return c;
1669: }
1670:
1.103 deraadt 1671: static Channel *
1.40 markus 1672: client_request_x11(const char *request_type, int rchan)
1673: {
1674: Channel *c = NULL;
1675: char *originator;
1676: int originator_port;
1.67 markus 1677: int sock;
1.40 markus 1678:
1679: if (!options.forward_x11) {
1680: error("Warning: ssh server tried X11 forwarding.");
1681: error("Warning: this is probably a break in attempt by a malicious server.");
1682: return NULL;
1683: }
1684: originator = packet_get_string(NULL);
1685: if (datafellows & SSH_BUG_X11FWD) {
1686: debug2("buggy server: x11 request w/o originator_port");
1687: originator_port = 0;
1688: } else {
1689: originator_port = packet_get_int();
1690: }
1.93 markus 1691: packet_check_eom();
1.40 markus 1692: /* XXX check permission */
1.47 markus 1693: debug("client_request_x11: request from %s %d", originator,
1694: originator_port);
1.67 markus 1695: xfree(originator);
1.40 markus 1696: sock = x11_connect_display();
1.67 markus 1697: if (sock < 0)
1698: return NULL;
1699: c = channel_new("x11",
1700: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1701: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1702: c->force_drain = 1;
1.40 markus 1703: return c;
1704: }
1705:
1.103 deraadt 1706: static Channel *
1.40 markus 1707: client_request_agent(const char *request_type, int rchan)
1708: {
1709: Channel *c = NULL;
1.67 markus 1710: int sock;
1.40 markus 1711:
1712: if (!options.forward_agent) {
1713: error("Warning: ssh server tried agent forwarding.");
1714: error("Warning: this is probably a break in attempt by a malicious server.");
1715: return NULL;
1716: }
1717: sock = ssh_get_authentication_socket();
1.67 markus 1718: if (sock < 0)
1719: return NULL;
1720: c = channel_new("authentication agent connection",
1721: SSH_CHANNEL_OPEN, sock, sock, -1,
1722: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1723: "authentication agent connection", 1);
1.82 markus 1724: c->force_drain = 1;
1.40 markus 1725: return c;
1726: }
1727:
1.22 markus 1728: /* XXXX move to generic input handler */
1.77 itojun 1729: static void
1.94 markus 1730: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1731: {
1732: Channel *c = NULL;
1733: char *ctype;
1734: int rchan;
1.102 markus 1735: u_int rmaxpack, rwindow, len;
1.22 markus 1736:
1737: ctype = packet_get_string(&len);
1738: rchan = packet_get_int();
1739: rwindow = packet_get_int();
1740: rmaxpack = packet_get_int();
1741:
1.24 markus 1742: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1743: ctype, rchan, rwindow, rmaxpack);
1744:
1.40 markus 1745: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1746: c = client_request_forwarded_tcpip(ctype, rchan);
1747: } else if (strcmp(ctype, "x11") == 0) {
1748: c = client_request_x11(ctype, rchan);
1749: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1750: c = client_request_agent(ctype, rchan);
1.22 markus 1751: }
1752: /* XXX duplicate : */
1753: if (c != NULL) {
1754: debug("confirm %s", ctype);
1755: c->remote_id = rchan;
1756: c->remote_window = rwindow;
1757: c->remote_maxpacket = rmaxpack;
1.69 markus 1758: if (c->type != SSH_CHANNEL_CONNECTING) {
1759: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1760: packet_put_int(c->remote_id);
1761: packet_put_int(c->self);
1762: packet_put_int(c->local_window);
1763: packet_put_int(c->local_maxpacket);
1764: packet_send();
1765: }
1.22 markus 1766: } else {
1767: debug("failure %s", ctype);
1768: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1769: packet_put_int(rchan);
1770: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1771: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1772: packet_put_cstring("open failed");
1.66 markus 1773: packet_put_cstring("");
1774: }
1.22 markus 1775: packet_send();
1776: }
1777: xfree(ctype);
1778: }
1.77 itojun 1779: static void
1.94 markus 1780: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1781: {
1782: Channel *c = NULL;
1.123 djm 1783: int exitval, id, reply, success = 0;
1.48 markus 1784: char *rtype;
1785:
1786: id = packet_get_int();
1787: rtype = packet_get_string(NULL);
1788: reply = packet_get_char();
1789:
1790: debug("client_input_channel_req: channel %d rtype %s reply %d",
1791: id, rtype, reply);
1792:
1.128 djm 1793: if (id == -1) {
1794: error("client_input_channel_req: request for channel -1");
1795: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1796: error("client_input_channel_req: channel %d: unknown channel", id);
1797: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1798: exitval = packet_get_int();
1799: if (id == session_ident) {
1800: success = 1;
1801: exit_status = exitval;
1802: } else if (c->ctl_fd == -1) {
1803: error("client_input_channel_req: unexpected channel %d",
1804: session_ident);
1805: } else {
1806: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1807: success = 1;
1808: }
1.93 markus 1809: packet_check_eom();
1.48 markus 1810: }
1811: if (reply) {
1812: packet_start(success ?
1813: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1814: packet_put_int(id);
1.48 markus 1815: packet_send();
1816: }
1817: xfree(rtype);
1818: }
1.95 markus 1819: static void
1820: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1821: {
1822: char *rtype;
1823: int want_reply;
1824: int success = 0;
1825:
1826: rtype = packet_get_string(NULL);
1827: want_reply = packet_get_char();
1.117 markus 1828: debug("client_input_global_request: rtype %s want_reply %d",
1829: rtype, want_reply);
1.95 markus 1830: if (want_reply) {
1831: packet_start(success ?
1832: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1833: packet_send();
1834: packet_write_wait();
1835: }
1836: xfree(rtype);
1837: }
1.22 markus 1838:
1.123 djm 1839: void
1.129 deraadt 1840: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1841: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1842: dispatch_fn *subsys_repl)
1843: {
1844: int len;
1.132 djm 1845: Channel *c = NULL;
1.123 djm 1846:
1847: debug2("%s: id %d", __func__, id);
1848:
1.132 djm 1849: if ((c = channel_lookup(id)) == NULL)
1850: fatal("client_session2_setup: channel %d: unknown channel", id);
1851:
1.123 djm 1852: if (want_tty) {
1853: struct winsize ws;
1854: struct termios tio;
1855:
1856: /* Store window size in the packet. */
1857: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1858: memset(&ws, 0, sizeof(ws));
1859:
1860: channel_request_start(id, "pty-req", 0);
1861: packet_put_cstring(term != NULL ? term : "");
1862: packet_put_int(ws.ws_col);
1863: packet_put_int(ws.ws_row);
1864: packet_put_int(ws.ws_xpixel);
1865: packet_put_int(ws.ws_ypixel);
1866: tio = get_saved_tio();
1867: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1868: packet_send();
1869: /* XXX wait for reply */
1.132 djm 1870: c->client_tty = 1;
1.123 djm 1871: }
1872:
1873: /* Transfer any environment variables from client to server */
1.126 djm 1874: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1875: int i, j, matched;
1876: char *name, *val;
1877:
1878: debug("Sending environment.");
1.126 djm 1879: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1880: /* Split */
1.126 djm 1881: name = xstrdup(env[i]);
1.123 djm 1882: if ((val = strchr(name, '=')) == NULL) {
1883: free(name);
1884: continue;
1885: }
1886: *val++ = '\0';
1887:
1888: matched = 0;
1889: for (j = 0; j < options.num_send_env; j++) {
1890: if (match_pattern(name, options.send_env[j])) {
1891: matched = 1;
1892: break;
1893: }
1894: }
1895: if (!matched) {
1896: debug3("Ignored env %s", name);
1897: free(name);
1898: continue;
1899: }
1900:
1901: debug("Sending env %s = %s", name, val);
1902: channel_request_start(id, "env", 0);
1903: packet_put_cstring(name);
1904: packet_put_cstring(val);
1905: packet_send();
1906: free(name);
1907: }
1908: }
1909:
1910: len = buffer_len(cmd);
1911: if (len > 0) {
1912: if (len > 900)
1913: len = 900;
1914: if (want_subsystem) {
1915: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1916: channel_request_start(id, "subsystem", subsys_repl != NULL);
1917: if (subsys_repl != NULL) {
1918: /* register callback for reply */
1919: /* XXX we assume that client_loop has already been called */
1920: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1921: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1922: }
1923: } else {
1924: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1925: channel_request_start(id, "exec", 0);
1926: }
1927: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1928: packet_send();
1929: } else {
1930: channel_request_start(id, "shell", 0);
1931: packet_send();
1932: }
1933: }
1934:
1.77 itojun 1935: static void
1.49 itojun 1936: client_init_dispatch_20(void)
1.16 markus 1937: {
1.55 markus 1938: dispatch_init(&dispatch_protocol_error);
1.100 markus 1939:
1.16 markus 1940: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1941: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1942: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1943: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1944: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1945: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1946: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1947: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1948: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1949: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1950:
1951: /* rekeying */
1952: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1953:
1954: /* global request reply messages */
1955: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1956: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1957: }
1.77 itojun 1958: static void
1.49 itojun 1959: client_init_dispatch_13(void)
1.15 markus 1960: {
1961: dispatch_init(NULL);
1962: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1963: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1964: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1965: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1966: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1967: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1968: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1969: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1970: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1971:
1972: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1973: &client_input_agent_open : &deny_input_open);
1.39 markus 1974: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1975: &x11_input_open : &deny_input_open);
1.15 markus 1976: }
1.77 itojun 1977: static void
1.49 itojun 1978: client_init_dispatch_15(void)
1.15 markus 1979: {
1980: client_init_dispatch_13();
1981: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1982: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1983: }
1.79 stevesk 1984: static void
1.49 itojun 1985: client_init_dispatch(void)
1.15 markus 1986: {
1.16 markus 1987: if (compat20)
1988: client_init_dispatch_20();
1989: else if (compat13)
1.15 markus 1990: client_init_dispatch_13();
1991: else
1992: client_init_dispatch_15();
1.113 markus 1993: }
1994:
1995: /* client specific fatal cleanup */
1996: void
1.114 markus 1997: cleanup_exit(int i)
1.113 markus 1998: {
1999: leave_raw_mode();
2000: leave_non_blocking();
1.123 djm 2001: if (options.control_path != NULL && control_fd != -1)
2002: unlink(options.control_path);
1.114 markus 2003: _exit(i);
1.1 deraadt 2004: }
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