Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.174
1.174 ! stevesk 1: /* $OpenBSD: clientloop.c,v 1.173 2006/07/26 13:57:17 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>
1.172 stevesk 69: #include <sys/param.h>
1.150 stevesk 70:
1.155 stevesk 71: #include <ctype.h>
1.168 stevesk 72: #include <errno.h>
1.151 stevesk 73: #include <paths.h>
1.153 stevesk 74: #include <signal.h>
1.174 ! stevesk 75: #include <stdio.h>
1.173 stevesk 76: #include <stdlib.h>
1.170 stevesk 77: #include <string.h>
1.150 stevesk 78: #include <termios.h>
1.169 stevesk 79: #include <unistd.h>
1.1 deraadt 80:
1.45 markus 81: #include "ssh.h"
82: #include "ssh1.h"
83: #include "ssh2.h"
1.1 deraadt 84: #include "xmalloc.h"
85: #include "packet.h"
86: #include "buffer.h"
1.15 markus 87: #include "compat.h"
1.74 markus 88: #include "channels.h"
1.15 markus 89: #include "dispatch.h"
1.30 markus 90: #include "buffer.h"
91: #include "bufaux.h"
1.40 markus 92: #include "key.h"
1.54 markus 93: #include "kex.h"
1.45 markus 94: #include "log.h"
95: #include "readconf.h"
96: #include "clientloop.h"
1.147 djm 97: #include "sshconnect.h"
1.40 markus 98: #include "authfd.h"
1.45 markus 99: #include "atomicio.h"
1.118 deraadt 100: #include "sshpty.h"
1.63 markus 101: #include "misc.h"
1.123 djm 102: #include "monitor_fdpass.h"
103: #include "match.h"
104: #include "msg.h"
1.39 markus 105:
106: /* import options */
107: extern Options options;
108:
1.1 deraadt 109: /* Flag indicating that stdin should be redirected from /dev/null. */
110: extern int stdin_null_flag;
111:
1.116 dtucker 112: /* Flag indicating that no shell has been requested */
113: extern int no_shell_flag;
114:
1.123 djm 115: /* Control socket */
116: extern int control_fd;
117:
1.13 markus 118: /*
119: * Name of the host we are connecting to. This is the name given on the
120: * command line, or the HostName specified for the user-supplied name in a
121: * configuration file.
122: */
1.1 deraadt 123: extern char *host;
124:
1.13 markus 125: /*
126: * Flag to indicate that we have received a window change signal which has
127: * not yet been processed. This will cause a message indicating the new
128: * window size to be sent to the server a little later. This is volatile
129: * because this is updated in a signal handler.
130: */
1.88 markus 131: static volatile sig_atomic_t received_window_change_signal = 0;
132: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 133:
1.145 djm 134: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 135: static int in_non_blocking_mode = 0;
136:
137: /* Common data for the client loop code. */
1.162 djm 138: static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.31 markus 139: static int escape_char; /* Escape character. */
1.11 markus 140: static int escape_pending; /* Last character was the escape character */
141: static int last_was_cr; /* Last character was a newline. */
142: static int exit_status; /* Used to store the exit status of the command. */
143: static int stdin_eof; /* EOF has been encountered on standard error. */
144: static Buffer stdin_buffer; /* Buffer for stdin data. */
145: static Buffer stdout_buffer; /* Buffer for stdout data. */
146: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 147: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
148: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 149: static int connection_in; /* Connection to server (input). */
150: static int connection_out; /* Connection to server (output). */
1.56 markus 151: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 152: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 153: static int server_alive_timeouts = 0;
1.1 deraadt 154:
1.77 itojun 155: static void client_init_dispatch(void);
1.16 markus 156: int session_ident = -1;
157:
1.123 djm 158: struct confirm_ctx {
159: int want_tty;
160: int want_subsys;
1.140 djm 161: int want_x_fwd;
162: int want_agent_fwd;
1.123 djm 163: Buffer cmd;
164: char *term;
165: struct termios tio;
1.126 djm 166: char **env;
1.123 djm 167: };
168:
1.54 markus 169: /*XXX*/
170: extern Kex *xxx_kex;
171:
1.123 djm 172: void ssh_process_session2_setup(int, int, int, Buffer *);
173:
1.1 deraadt 174: /* Restores stdin to blocking mode. */
175:
1.77 itojun 176: static void
1.49 itojun 177: leave_non_blocking(void)
1.1 deraadt 178: {
1.11 markus 179: if (in_non_blocking_mode) {
1.125 djm 180: unset_nonblock(fileno(stdin));
1.11 markus 181: in_non_blocking_mode = 0;
182: }
1.1 deraadt 183: }
184:
1.11 markus 185: /* Puts stdin terminal in non-blocking mode. */
186:
1.77 itojun 187: static void
1.49 itojun 188: enter_non_blocking(void)
1.1 deraadt 189: {
1.11 markus 190: in_non_blocking_mode = 1;
1.124 djm 191: set_nonblock(fileno(stdin));
1.1 deraadt 192: }
193:
1.13 markus 194: /*
195: * Signal handler for the window change signal (SIGWINCH). This just sets a
196: * flag indicating that the window has changed.
197: */
1.157 deraadt 198: /*ARGSUSED */
1.77 itojun 199: static void
1.11 markus 200: window_change_handler(int sig)
1.1 deraadt 201: {
1.11 markus 202: received_window_change_signal = 1;
203: signal(SIGWINCH, window_change_handler);
1.1 deraadt 204: }
205:
1.13 markus 206: /*
207: * Signal handler for signals that cause the program to terminate. These
208: * signals must be trapped to restore terminal modes.
209: */
1.157 deraadt 210: /*ARGSUSED */
1.77 itojun 211: static void
1.11 markus 212: signal_handler(int sig)
1.1 deraadt 213: {
1.75 markus 214: received_signal = sig;
215: quit_pending = 1;
1.1 deraadt 216: }
217:
1.13 markus 218: /*
219: * Returns current time in seconds from Jan 1, 1970 with the maximum
220: * available resolution.
221: */
1.1 deraadt 222:
1.77 itojun 223: static double
1.49 itojun 224: get_current_time(void)
1.1 deraadt 225: {
1.11 markus 226: struct timeval tv;
227: gettimeofday(&tv, NULL);
228: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 229: }
230:
231: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
232: void
233: client_x11_get_proto(const char *display, const char *xauth_path,
234: u_int trusted, char **_proto, char **_data)
235: {
236: char cmd[1024];
237: char line[512];
238: char xdisplay[512];
239: static char proto[512], data[512];
240: FILE *f;
241: int got_data = 0, generated = 0, do_unlink = 0, i;
242: char *xauthdir, *xauthfile;
243: struct stat st;
244:
245: xauthdir = xauthfile = NULL;
246: *_proto = proto;
247: *_data = data;
248: proto[0] = data[0] = '\0';
249:
250: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
251: debug("No xauth program.");
252: } else {
253: if (display == NULL) {
254: debug("x11_get_proto: DISPLAY not set");
255: return;
256: }
257: /*
258: * Handle FamilyLocal case where $DISPLAY does
259: * not match an authorization entry. For this we
260: * just try "xauth list unix:displaynum.screennum".
261: * XXX: "localhost" match to determine FamilyLocal
262: * is not perfect.
263: */
264: if (strncmp(display, "localhost:", 10) == 0) {
265: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
266: display + 10);
267: display = xdisplay;
268: }
269: if (trusted == 0) {
270: xauthdir = xmalloc(MAXPATHLEN);
271: xauthfile = xmalloc(MAXPATHLEN);
272: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
273: if (mkdtemp(xauthdir) != NULL) {
274: do_unlink = 1;
275: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
276: xauthdir);
277: snprintf(cmd, sizeof(cmd),
278: "%s -f %s generate %s " SSH_X11_PROTO
279: " untrusted timeout 1200 2>" _PATH_DEVNULL,
280: xauth_path, xauthfile, display);
281: debug2("x11_get_proto: %s", cmd);
282: if (system(cmd) == 0)
283: generated = 1;
284: }
285: }
286: snprintf(cmd, sizeof(cmd),
1.142 markus 287: "%s %s%s list %s 2>" _PATH_DEVNULL,
1.138 djm 288: xauth_path,
289: generated ? "-f " : "" ,
290: generated ? xauthfile : "",
291: display);
292: debug2("x11_get_proto: %s", cmd);
293: f = popen(cmd, "r");
294: if (f && fgets(line, sizeof(line), f) &&
295: sscanf(line, "%*s %511s %511s", proto, data) == 2)
296: got_data = 1;
297: if (f)
298: pclose(f);
299: }
300:
301: if (do_unlink) {
302: unlink(xauthfile);
303: rmdir(xauthdir);
304: }
305: if (xauthdir)
306: xfree(xauthdir);
307: if (xauthfile)
308: xfree(xauthfile);
309:
310: /*
311: * If we didn't get authentication data, just make up some
312: * data. The forwarding code will check the validity of the
313: * response anyway, and substitute this data. The X11
314: * server, however, will ignore this fake data and use
315: * whatever authentication mechanisms it was using otherwise
316: * for the local connection.
317: */
318: if (!got_data) {
319: u_int32_t rnd = 0;
320:
321: logit("Warning: No xauth data; "
322: "using fake authentication data for X11 forwarding.");
323: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
324: for (i = 0; i < 16; i++) {
325: if (i % 4 == 0)
326: rnd = arc4random();
327: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
328: rnd & 0xff);
329: rnd >>= 8;
330: }
331: }
1.1 deraadt 332: }
333:
1.13 markus 334: /*
335: * This is called when the interactive is entered. This checks if there is
336: * an EOF coming on stdin. We must check this explicitly, as select() does
337: * not appear to wake up when redirecting from /dev/null.
338: */
1.1 deraadt 339:
1.77 itojun 340: static void
1.49 itojun 341: client_check_initial_eof_on_stdin(void)
1.1 deraadt 342: {
1.11 markus 343: int len;
344: char buf[1];
1.1 deraadt 345:
1.13 markus 346: /*
347: * If standard input is to be "redirected from /dev/null", we simply
348: * mark that we have seen an EOF and send an EOF message to the
349: * server. Otherwise, we try to read a single character; it appears
350: * that for some files, such /dev/null, select() never wakes up for
351: * read for this descriptor, which means that we never get EOF. This
352: * way we will get the EOF if stdin comes from /dev/null or similar.
353: */
1.11 markus 354: if (stdin_null_flag) {
355: /* Fake EOF on stdin. */
356: debug("Sending eof.");
357: stdin_eof = 1;
358: packet_start(SSH_CMSG_EOF);
359: packet_send();
360: } else {
361: enter_non_blocking();
362:
363: /* Check for immediate EOF on stdin. */
364: len = read(fileno(stdin), buf, 1);
365: if (len == 0) {
1.13 markus 366: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 367: debug("Sending eof.");
368: stdin_eof = 1;
369: packet_start(SSH_CMSG_EOF);
370: packet_send();
371: } else if (len > 0) {
1.13 markus 372: /*
373: * Got data. We must store the data in the buffer,
374: * and also process it as an escape character if
375: * appropriate.
376: */
1.42 markus 377: if ((u_char) buf[0] == escape_char)
1.11 markus 378: escape_pending = 1;
1.52 markus 379: else
1.11 markus 380: buffer_append(&stdin_buffer, buf, 1);
381: }
382: leave_non_blocking();
383: }
1.1 deraadt 384: }
385:
386:
1.13 markus 387: /*
388: * Make packets from buffered stdin data, and buffer them for sending to the
389: * connection.
390: */
1.1 deraadt 391:
1.77 itojun 392: static void
1.49 itojun 393: client_make_packets_from_stdin_data(void)
1.1 deraadt 394: {
1.42 markus 395: u_int len;
1.1 deraadt 396:
1.11 markus 397: /* Send buffered stdin data to the server. */
398: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 399: packet_not_very_much_data_to_write()) {
1.11 markus 400: len = buffer_len(&stdin_buffer);
401: /* Keep the packets at reasonable size. */
402: if (len > packet_get_maxsize())
403: len = packet_get_maxsize();
404: packet_start(SSH_CMSG_STDIN_DATA);
405: packet_put_string(buffer_ptr(&stdin_buffer), len);
406: packet_send();
407: buffer_consume(&stdin_buffer, len);
1.52 markus 408: stdin_bytes += len;
1.11 markus 409: /* If we have a pending EOF, send it now. */
410: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
411: packet_start(SSH_CMSG_EOF);
412: packet_send();
413: }
1.1 deraadt 414: }
415: }
416:
1.13 markus 417: /*
418: * Checks if the client window has changed, and sends a packet about it to
419: * the server if so. The actual change is detected elsewhere (by a software
420: * interrupt on Unix); this just checks the flag and sends a message if
421: * appropriate.
422: */
1.1 deraadt 423:
1.77 itojun 424: static void
1.49 itojun 425: client_check_window_change(void)
1.1 deraadt 426: {
1.16 markus 427: struct winsize ws;
428:
429: if (! received_window_change_signal)
430: return;
431: /** XXX race */
432: received_window_change_signal = 0;
433:
1.37 markus 434: debug2("client_check_window_change: changed");
1.16 markus 435:
436: if (compat20) {
1.123 djm 437: channel_send_window_changes();
1.16 markus 438: } else {
1.123 djm 439: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
440: return;
1.16 markus 441: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 442: packet_put_int((u_int)ws.ws_row);
443: packet_put_int((u_int)ws.ws_col);
444: packet_put_int((u_int)ws.ws_xpixel);
445: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 446: packet_send();
1.1 deraadt 447: }
448: }
449:
1.117 markus 450: static void
451: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
452: {
453: server_alive_timeouts = 0;
454: client_global_request_reply_fwd(type, seq, ctxt);
455: }
456:
457: static void
458: server_alive_check(void)
459: {
460: if (++server_alive_timeouts > options.server_alive_count_max)
461: packet_disconnect("Timeout, server not responding.");
462: packet_start(SSH2_MSG_GLOBAL_REQUEST);
463: packet_put_cstring("keepalive@openssh.com");
464: packet_put_char(1); /* boolean: want reply */
465: packet_send();
466: }
467:
1.13 markus 468: /*
469: * Waits until the client can do something (some data becomes available on
470: * one of the file descriptors).
471: */
1.77 itojun 472: static void
1.46 markus 473: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 474: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 475: {
1.117 markus 476: struct timeval tv, *tvp;
477: int ret;
478:
1.46 markus 479: /* Add any selections by the channel mechanism. */
1.81 markus 480: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 481:
1.16 markus 482: if (!compat20) {
1.17 markus 483: /* Read from the connection, unless our buffers are full. */
1.16 markus 484: if (buffer_len(&stdout_buffer) < buffer_high &&
485: buffer_len(&stderr_buffer) < buffer_high &&
486: channel_not_very_much_buffered_data())
1.46 markus 487: FD_SET(connection_in, *readsetp);
1.17 markus 488: /*
489: * Read from stdin, unless we have seen EOF or have very much
490: * buffered data to send to the server.
491: */
492: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 493: FD_SET(fileno(stdin), *readsetp);
1.17 markus 494:
495: /* Select stdout/stderr if have data in buffer. */
496: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 497: FD_SET(fileno(stdout), *writesetp);
1.17 markus 498: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 499: FD_SET(fileno(stderr), *writesetp);
1.16 markus 500: } else {
1.71 markus 501: /* channel_prepare_select could have closed the last channel */
1.84 markus 502: if (session_closed && !channel_still_open() &&
503: !packet_have_data_to_write()) {
504: /* clear mask since we did not call select() */
1.87 markus 505: memset(*readsetp, 0, *nallocp);
506: memset(*writesetp, 0, *nallocp);
1.84 markus 507: return;
1.71 markus 508: } else {
509: FD_SET(connection_in, *readsetp);
510: }
1.16 markus 511: }
1.11 markus 512:
513: /* Select server connection if have data to write to the server. */
514: if (packet_have_data_to_write())
1.46 markus 515: FD_SET(connection_out, *writesetp);
1.11 markus 516:
1.123 djm 517: if (control_fd != -1)
518: FD_SET(control_fd, *readsetp);
519:
1.13 markus 520: /*
521: * Wait for something to happen. This will suspend the process until
522: * some selected descriptor can be read, written, or has some other
1.117 markus 523: * event pending.
1.13 markus 524: */
1.11 markus 525:
1.117 markus 526: if (options.server_alive_interval == 0 || !compat20)
527: tvp = NULL;
1.129 deraadt 528: else {
1.117 markus 529: tv.tv_sec = options.server_alive_interval;
530: tv.tv_usec = 0;
531: tvp = &tv;
532: }
533: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
534: if (ret < 0) {
1.11 markus 535: char buf[100];
1.51 markus 536:
537: /*
538: * We have to clear the select masks, because we return.
539: * We have to return, because the mainloop checks for the flags
540: * set by the signal handlers.
541: */
1.87 markus 542: memset(*readsetp, 0, *nallocp);
543: memset(*writesetp, 0, *nallocp);
1.50 deraadt 544:
1.11 markus 545: if (errno == EINTR)
546: return;
547: /* Note: we might still have data in the buffers. */
548: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
549: buffer_append(&stderr_buffer, buf, strlen(buf));
550: quit_pending = 1;
1.117 markus 551: } else if (ret == 0)
552: server_alive_check();
1.11 markus 553: }
554:
1.77 itojun 555: static void
1.31 markus 556: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 557: {
1.11 markus 558: /* Flush stdout and stderr buffers. */
1.31 markus 559: if (buffer_len(bout) > 0)
1.112 deraadt 560: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 561: if (buffer_len(berr) > 0)
1.112 deraadt 562: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 563:
564: leave_raw_mode();
565:
1.13 markus 566: /*
567: * Free (and clear) the buffer to reduce the amount of data that gets
568: * written to swap.
569: */
1.31 markus 570: buffer_free(bin);
571: buffer_free(bout);
572: buffer_free(berr);
1.11 markus 573:
574: /* Send the suspend signal to the program itself. */
575: kill(getpid(), SIGTSTP);
576:
1.132 djm 577: /* Reset window sizes in case they have changed */
578: received_window_change_signal = 1;
1.11 markus 579:
580: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 581: buffer_init(bin);
582: buffer_init(bout);
583: buffer_init(berr);
1.11 markus 584:
585: enter_raw_mode();
586: }
587:
1.77 itojun 588: static void
1.161 deraadt 589: client_process_net_input(fd_set *readset)
1.11 markus 590: {
1.17 markus 591: int len;
592: char buf[8192];
1.11 markus 593:
1.13 markus 594: /*
595: * Read input from the server, and add any such data to the buffer of
596: * the packet subsystem.
597: */
1.11 markus 598: if (FD_ISSET(connection_in, readset)) {
599: /* Read as much as possible. */
600: len = read(connection_in, buf, sizeof(buf));
601: if (len == 0) {
602: /* Received EOF. The remote host has closed the connection. */
603: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
604: host);
1.1 deraadt 605: buffer_append(&stderr_buffer, buf, strlen(buf));
606: quit_pending = 1;
607: return;
1.11 markus 608: }
1.13 markus 609: /*
610: * There is a kernel bug on Solaris that causes select to
611: * sometimes wake up even though there is no data available.
612: */
1.53 millert 613: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 614: len = 0;
615:
616: if (len < 0) {
617: /* An error has encountered. Perhaps there is a network problem. */
618: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
619: host, strerror(errno));
620: buffer_append(&stderr_buffer, buf, strlen(buf));
621: quit_pending = 1;
622: return;
623: }
624: packet_process_incoming(buf, len);
625: }
1.17 markus 626: }
1.16 markus 627:
1.97 jakob 628: static void
1.123 djm 629: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
630: {
631: int id;
632: Channel *c;
1.129 deraadt 633:
1.123 djm 634: id = packet_get_int();
635: packet_check_eom();
636:
637: if ((c = channel_lookup(id)) == NULL) {
638: error("%s: no channel for id %d", __func__, id);
639: return;
640: }
641:
642: if (type == SSH2_MSG_CHANNEL_SUCCESS)
643: debug2("Request suceeded on channel %d", id);
644: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
645: error("Request failed on channel %d", id);
646: channel_free(c);
647: }
648: }
649:
650: static void
651: client_extra_session2_setup(int id, void *arg)
652: {
653: struct confirm_ctx *cctx = arg;
1.140 djm 654: const char *display;
1.123 djm 655: Channel *c;
1.126 djm 656: int i;
1.129 deraadt 657:
1.123 djm 658: if (cctx == NULL)
659: fatal("%s: cctx == NULL", __func__);
660: if ((c = channel_lookup(id)) == NULL)
661: fatal("%s: no channel for id %d", __func__, id);
662:
1.141 djm 663: display = getenv("DISPLAY");
1.140 djm 664: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
665: char *proto, *data;
666: /* Get reasonable local authentication information. */
667: client_x11_get_proto(display, options.xauth_location,
668: options.forward_x11_trusted, &proto, &data);
669: /* Request forwarding with authentication spoofing. */
670: debug("Requesting X11 forwarding with authentication spoofing.");
671: x11_request_forwarding_with_spoofing(id, display, proto, data);
672: /* XXX wait for reply */
673: }
674:
675: if (cctx->want_agent_fwd && options.forward_agent) {
676: debug("Requesting authentication agent forwarding.");
677: channel_request_start(id, "auth-agent-req@openssh.com", 0);
678: packet_send();
679: }
680:
1.129 deraadt 681: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 682: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 683: client_subsystem_reply);
1.127 djm 684:
1.123 djm 685: c->confirm_ctx = NULL;
686: buffer_free(&cctx->cmd);
1.126 djm 687: xfree(cctx->term);
688: if (cctx->env != NULL) {
689: for (i = 0; cctx->env[i] != NULL; i++)
690: xfree(cctx->env[i]);
691: xfree(cctx->env);
1.129 deraadt 692: }
1.126 djm 693: xfree(cctx);
1.123 djm 694: }
695:
696: static void
1.161 deraadt 697: client_process_control(fd_set *readset)
1.123 djm 698: {
699: Buffer m;
700: Channel *c;
1.139 djm 701: int client_fd, new_fd[3], ver, allowed;
1.123 djm 702: socklen_t addrlen;
703: struct sockaddr_storage addr;
704: struct confirm_ctx *cctx;
705: char *cmd;
1.139 djm 706: u_int i, len, env_len, command, flags;
1.123 djm 707: uid_t euid;
708: gid_t egid;
709:
710: /*
711: * Accept connection on control socket
712: */
713: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
714: return;
715:
716: memset(&addr, 0, sizeof(addr));
717: addrlen = sizeof(addr);
718: if ((client_fd = accept(control_fd,
719: (struct sockaddr*)&addr, &addrlen)) == -1) {
720: error("%s accept: %s", __func__, strerror(errno));
721: return;
722: }
723:
724: if (getpeereid(client_fd, &euid, &egid) < 0) {
725: error("%s getpeereid failed: %s", __func__, strerror(errno));
726: close(client_fd);
727: return;
728: }
729: if ((euid != 0) && (getuid() != euid)) {
730: error("control mode uid mismatch: peer euid %u != uid %u",
731: (u_int) euid, (u_int) getuid());
732: close(client_fd);
733: return;
734: }
1.127 djm 735:
1.134 djm 736: unset_nonblock(client_fd);
737:
738: /* Read command */
739: buffer_init(&m);
740: if (ssh_msg_recv(client_fd, &m) == -1) {
741: error("%s: client msg_recv failed", __func__);
742: close(client_fd);
743: buffer_free(&m);
744: return;
745: }
1.140 djm 746: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 747: error("%s: wrong client version %d", __func__, ver);
748: buffer_free(&m);
749: close(client_fd);
750: return;
751: }
752:
1.127 djm 753: allowed = 1;
1.134 djm 754: command = buffer_get_int(&m);
755: flags = buffer_get_int(&m);
1.123 djm 756:
1.134 djm 757: buffer_clear(&m);
1.123 djm 758:
1.134 djm 759: switch (command) {
760: case SSHMUX_COMMAND_OPEN:
1.137 djm 761: if (options.control_master == SSHCTL_MASTER_ASK ||
762: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 763: allowed = ask_permission("Allow shared connection "
764: "to %s? ", host);
765: /* continue below */
766: break;
767: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 768: if (options.control_master == SSHCTL_MASTER_ASK ||
769: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 770: allowed = ask_permission("Terminate shared connection "
771: "to %s? ", host);
772: if (allowed)
773: quit_pending = 1;
1.136 deraadt 774: /* FALLTHROUGH */
1.134 djm 775: case SSHMUX_COMMAND_ALIVE_CHECK:
776: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
777: buffer_clear(&m);
778: buffer_put_int(&m, allowed);
779: buffer_put_int(&m, getpid());
1.140 djm 780: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 781: error("%s: client msg_send failed", __func__);
782: close(client_fd);
783: buffer_free(&m);
784: return;
785: }
786: buffer_free(&m);
787: close(client_fd);
788: return;
789: default:
790: error("Unsupported command %d", command);
791: buffer_free(&m);
792: close(client_fd);
793: return;
794: }
1.123 djm 795:
1.134 djm 796: /* Reply for SSHMUX_COMMAND_OPEN */
797: buffer_clear(&m);
1.127 djm 798: buffer_put_int(&m, allowed);
1.123 djm 799: buffer_put_int(&m, getpid());
1.140 djm 800: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 801: error("%s: client msg_send failed", __func__);
802: close(client_fd);
1.127 djm 803: buffer_free(&m);
1.123 djm 804: return;
805: }
806:
1.127 djm 807: if (!allowed) {
808: error("Refused control connection");
809: close(client_fd);
810: buffer_free(&m);
811: return;
812: }
813:
1.134 djm 814: buffer_clear(&m);
1.123 djm 815: if (ssh_msg_recv(client_fd, &m) == -1) {
816: error("%s: client msg_recv failed", __func__);
817: close(client_fd);
1.127 djm 818: buffer_free(&m);
1.123 djm 819: return;
820: }
1.140 djm 821: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 822: error("%s: wrong client version %d", __func__, ver);
823: buffer_free(&m);
824: close(client_fd);
825: return;
826: }
827:
1.159 djm 828: cctx = xcalloc(1, sizeof(*cctx));
1.134 djm 829: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
830: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 831: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
832: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 833: cctx->term = buffer_get_string(&m, &len);
834:
835: cmd = buffer_get_string(&m, &len);
836: buffer_init(&cctx->cmd);
837: buffer_append(&cctx->cmd, cmd, strlen(cmd));
838:
1.126 djm 839: env_len = buffer_get_int(&m);
840: env_len = MIN(env_len, 4096);
841: debug3("%s: receiving %d env vars", __func__, env_len);
842: if (env_len != 0) {
1.159 djm 843: cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
1.126 djm 844: for (i = 0; i < env_len; i++)
845: cctx->env[i] = buffer_get_string(&m, &len);
846: cctx->env[i] = NULL;
847: }
848:
1.123 djm 849: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
850: cctx->want_tty, cctx->want_subsys, cmd);
1.163 markus 851: xfree(cmd);
1.123 djm 852:
853: /* Gather fds from client */
854: new_fd[0] = mm_receive_fd(client_fd);
855: new_fd[1] = mm_receive_fd(client_fd);
856: new_fd[2] = mm_receive_fd(client_fd);
857:
858: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
859: new_fd[0], new_fd[1], new_fd[2]);
860:
861: /* Try to pick up ttymodes from client before it goes raw */
862: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
863: error("%s: tcgetattr: %s", __func__, strerror(errno));
864:
1.134 djm 865: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 866: buffer_clear(&m);
1.140 djm 867: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 868: error("%s: client msg_send failed", __func__);
869: close(client_fd);
870: close(new_fd[0]);
871: close(new_fd[1]);
872: close(new_fd[2]);
1.127 djm 873: buffer_free(&m);
1.134 djm 874: xfree(cctx->term);
875: if (env_len != 0) {
876: for (i = 0; i < env_len; i++)
877: xfree(cctx->env[i]);
878: xfree(cctx->env);
879: }
1.123 djm 880: return;
881: }
882: buffer_free(&m);
883:
884: /* enable nonblocking unless tty */
885: if (!isatty(new_fd[0]))
886: set_nonblock(new_fd[0]);
887: if (!isatty(new_fd[1]))
888: set_nonblock(new_fd[1]);
889: if (!isatty(new_fd[2]))
890: set_nonblock(new_fd[2]);
891:
892: set_nonblock(client_fd);
893:
1.129 deraadt 894: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 895: new_fd[0], new_fd[1], new_fd[2],
896: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
897: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
898:
899: /* XXX */
900: c->ctl_fd = client_fd;
901:
902: debug3("%s: channel_new: %d", __func__, c->self);
903:
904: channel_send_open(c->self);
905: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
906: }
907:
908: static void
1.99 markus 909: process_cmdline(void)
1.97 jakob 910: {
911: void (*handler)(int);
1.135 djm 912: char *s, *cmd, *cancel_host;
1.121 djm 913: int delete = 0;
1.97 jakob 914: int local = 0;
1.135 djm 915: u_short cancel_port;
916: Forward fwd;
1.97 jakob 917:
918: leave_raw_mode();
1.101 markus 919: handler = signal(SIGINT, SIG_IGN);
1.99 markus 920: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 921: if (s == NULL)
922: goto out;
923: while (*s && isspace(*s))
924: s++;
1.121 djm 925: if (*s == '-')
926: s++; /* Skip cmdline '-', if any */
1.120 dtucker 927: if (*s == '\0')
1.97 jakob 928: goto out;
1.121 djm 929:
1.122 djm 930: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 931: logit("Commands:");
1.164 djm 932: logit(" -L[bind_address:]port:host:hostport "
933: "Request local forward");
934: logit(" -R[bind_address:]port:host:hostport "
935: "Request remote forward");
1.165 stevesk 936: logit(" -KR[bind_address:]port "
1.164 djm 937: "Cancel remote forward");
1.146 reyk 938: if (!options.permit_local_command)
939: goto out;
1.164 djm 940: logit(" !args "
941: "Execute local command");
1.146 reyk 942: goto out;
943: }
944:
945: if (*s == '!' && options.permit_local_command) {
946: s++;
947: ssh_local_cmd(s);
1.121 djm 948: goto out;
949: }
950:
951: if (*s == 'K') {
952: delete = 1;
953: s++;
954: }
955: if (*s != 'L' && *s != 'R') {
1.109 itojun 956: logit("Invalid command.");
1.97 jakob 957: goto out;
958: }
1.121 djm 959: if (*s == 'L')
1.97 jakob 960: local = 1;
1.121 djm 961: if (local && delete) {
962: logit("Not supported.");
963: goto out;
964: }
965: if ((!local || delete) && !compat20) {
1.109 itojun 966: logit("Not supported for SSH protocol version 1.");
1.97 jakob 967: goto out;
968: }
1.121 djm 969:
970: s++;
1.97 jakob 971: while (*s && isspace(*s))
972: s++;
973:
1.121 djm 974: if (delete) {
1.135 djm 975: cancel_port = 0;
976: cancel_host = hpdelim(&s); /* may be NULL */
977: if (s != NULL) {
978: cancel_port = a2port(s);
979: cancel_host = cleanhostname(cancel_host);
980: } else {
981: cancel_port = a2port(cancel_host);
982: cancel_host = NULL;
1.121 djm 983: }
1.135 djm 984: if (cancel_port == 0) {
985: logit("Bad forwarding close port");
1.121 djm 986: goto out;
987: }
1.135 djm 988: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 989: } else {
1.135 djm 990: if (!parse_forward(&fwd, s)) {
1.121 djm 991: logit("Bad forwarding specification.");
992: goto out;
993: }
994: if (local) {
1.135 djm 995: if (channel_setup_local_fwd_listener(fwd.listen_host,
996: fwd.listen_port, fwd.connect_host,
997: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 998: logit("Port forwarding failed.");
999: goto out;
1000: }
1.135 djm 1001: } else {
1.167 markus 1002: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 1003: fwd.listen_port, fwd.connect_host,
1.167 markus 1004: fwd.connect_port) < 0) {
1005: logit("Port forwarding failed.");
1006: goto out;
1007: }
1.135 djm 1008: }
1009:
1.121 djm 1010: logit("Forwarding port.");
1011: }
1012:
1.97 jakob 1013: out:
1014: signal(SIGINT, handler);
1015: enter_raw_mode();
1016: if (cmd)
1017: xfree(cmd);
1018: }
1019:
1.31 markus 1020: /* process the characters one by one */
1.77 itojun 1021: static int
1.31 markus 1022: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1023: {
1.32 markus 1024: char string[1024];
1.31 markus 1025: pid_t pid;
1026: int bytes = 0;
1.42 markus 1027: u_int i;
1028: u_char ch;
1.31 markus 1029: char *s;
1030:
1.139 djm 1031: if (len <= 0)
1032: return (0);
1033:
1034: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1035: /* Get one character at a time. */
1036: ch = buf[i];
1037:
1038: if (escape_pending) {
1039: /* We have previously seen an escape character. */
1040: /* Clear the flag now. */
1041: escape_pending = 0;
1042:
1043: /* Process the escaped character. */
1044: switch (ch) {
1045: case '.':
1046: /* Terminate the connection. */
1.32 markus 1047: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1048: buffer_append(berr, string, strlen(string));
1.31 markus 1049:
1050: quit_pending = 1;
1051: return -1;
1052:
1053: case 'Z' - 64:
1054: /* Suspend the program. */
1055: /* Print a message to that effect to the user. */
1.32 markus 1056: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1057: buffer_append(berr, string, strlen(string));
1.31 markus 1058:
1059: /* Restore terminal modes and suspend. */
1060: client_suspend_self(bin, bout, berr);
1061:
1062: /* We have been continued. */
1063: continue;
1064:
1.111 markus 1065: case 'B':
1066: if (compat20) {
1067: snprintf(string, sizeof string,
1068: "%cB\r\n", escape_char);
1069: buffer_append(berr, string,
1070: strlen(string));
1071: channel_request_start(session_ident,
1072: "break", 0);
1073: packet_put_int(1000);
1074: packet_send();
1075: }
1076: continue;
1077:
1.54 markus 1078: case 'R':
1.59 markus 1079: if (compat20) {
1080: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1081: logit("Server does not support re-keying");
1.59 markus 1082: else
1083: need_rekeying = 1;
1084: }
1.54 markus 1085: continue;
1086:
1.31 markus 1087: case '&':
1088: /*
1089: * Detach the program (continue to serve connections,
1090: * but put in background and no more new connections).
1091: */
1092: /* Restore tty modes. */
1093: leave_raw_mode();
1094:
1095: /* Stop listening for new connections. */
1.86 markus 1096: channel_stop_listening();
1.31 markus 1097:
1.86 markus 1098: snprintf(string, sizeof string,
1099: "%c& [backgrounded]\n", escape_char);
1100: buffer_append(berr, string, strlen(string));
1.31 markus 1101:
1102: /* Fork into background. */
1103: pid = fork();
1104: if (pid < 0) {
1105: error("fork: %.100s", strerror(errno));
1106: continue;
1107: }
1108: if (pid != 0) { /* This is the parent. */
1109: /* The parent just exits. */
1110: exit(0);
1111: }
1112: /* The child continues serving connections. */
1.86 markus 1113: if (compat20) {
1114: buffer_append(bin, "\004", 1);
1115: /* fake EOF on stdin */
1116: return -1;
1117: } else if (!stdin_eof) {
1118: /*
1119: * Sending SSH_CMSG_EOF alone does not always appear
1120: * to be enough. So we try to send an EOF character
1121: * first.
1122: */
1123: packet_start(SSH_CMSG_STDIN_DATA);
1124: packet_put_string("\004", 1);
1125: packet_send();
1126: /* Close stdin. */
1127: stdin_eof = 1;
1128: if (buffer_len(bin) == 0) {
1129: packet_start(SSH_CMSG_EOF);
1130: packet_send();
1131: }
1132: }
1133: continue;
1.31 markus 1134:
1135: case '?':
1.32 markus 1136: snprintf(string, sizeof string,
1.31 markus 1137: "%c?\r\n\
1138: Supported escape sequences:\r\n\
1.104 stevesk 1139: %c. - terminate connection\r\n\
1.111 markus 1140: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1141: %cC - open a command line\r\n\
1142: %cR - Request rekey (SSH protocol 2 only)\r\n\
1143: %c^Z - suspend ssh\r\n\
1144: %c# - list forwarded connections\r\n\
1145: %c& - background ssh (when waiting for connections to terminate)\r\n\
1146: %c? - this message\r\n\
1147: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1148: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1149: escape_char, escape_char, escape_char, escape_char,
1150: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1151: escape_char, escape_char, escape_char);
1.32 markus 1152: buffer_append(berr, string, strlen(string));
1.31 markus 1153: continue;
1154:
1155: case '#':
1.32 markus 1156: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1157: buffer_append(berr, string, strlen(string));
1.31 markus 1158: s = channel_open_message();
1159: buffer_append(berr, s, strlen(s));
1160: xfree(s);
1.97 jakob 1161: continue;
1162:
1163: case 'C':
1.99 markus 1164: process_cmdline();
1.31 markus 1165: continue;
1166:
1167: default:
1168: if (ch != escape_char) {
1169: buffer_put_char(bin, escape_char);
1170: bytes++;
1171: }
1172: /* Escaped characters fall through here */
1173: break;
1174: }
1175: } else {
1176: /*
1177: * The previous character was not an escape char. Check if this
1178: * is an escape.
1179: */
1180: if (last_was_cr && ch == escape_char) {
1181: /* It is. Set the flag and continue to next character. */
1182: escape_pending = 1;
1183: continue;
1184: }
1185: }
1186:
1187: /*
1188: * Normal character. Record whether it was a newline,
1189: * and append it to the buffer.
1190: */
1191: last_was_cr = (ch == '\r' || ch == '\n');
1192: buffer_put_char(bin, ch);
1193: bytes++;
1194: }
1195: return bytes;
1196: }
1197:
1.77 itojun 1198: static void
1.161 deraadt 1199: client_process_input(fd_set *readset)
1.17 markus 1200: {
1.21 deraadt 1201: int len;
1.31 markus 1202: char buf[8192];
1.16 markus 1203:
1.11 markus 1204: /* Read input from stdin. */
1205: if (FD_ISSET(fileno(stdin), readset)) {
1206: /* Read as much as possible. */
1207: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1208: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1209: return; /* we'll try again later */
1.11 markus 1210: if (len <= 0) {
1.13 markus 1211: /*
1212: * Received EOF or error. They are treated
1213: * similarly, except that an error message is printed
1214: * if it was an error condition.
1215: */
1.11 markus 1216: if (len < 0) {
1217: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1218: buffer_append(&stderr_buffer, buf, strlen(buf));
1219: }
1220: /* Mark that we have seen EOF. */
1221: stdin_eof = 1;
1.13 markus 1222: /*
1223: * Send an EOF message to the server unless there is
1224: * data in the buffer. If there is data in the
1225: * buffer, no message will be sent now. Code
1226: * elsewhere will send the EOF when the buffer
1227: * becomes empty if stdin_eof is set.
1228: */
1.11 markus 1229: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1230: packet_start(SSH_CMSG_EOF);
1231: packet_send();
1.11 markus 1232: }
1.72 stevesk 1233: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1234: /*
1235: * Normal successful read, and no escape character.
1236: * Just append the data to buffer.
1237: */
1.11 markus 1238: buffer_append(&stdin_buffer, buf, len);
1239: } else {
1.13 markus 1240: /*
1241: * Normal, successful read. But we have an escape character
1242: * and have to process the characters one by one.
1243: */
1.52 markus 1244: if (process_escapes(&stdin_buffer, &stdout_buffer,
1245: &stderr_buffer, buf, len) == -1)
1.31 markus 1246: return;
1.11 markus 1247: }
1248: }
1249: }
1250:
1.77 itojun 1251: static void
1.161 deraadt 1252: client_process_output(fd_set *writeset)
1.11 markus 1253: {
1254: int len;
1255: char buf[100];
1.1 deraadt 1256:
1.11 markus 1257: /* Write buffered output to stdout. */
1258: if (FD_ISSET(fileno(stdout), writeset)) {
1259: /* Write as much data as possible. */
1260: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1261: buffer_len(&stdout_buffer));
1.11 markus 1262: if (len <= 0) {
1.64 markus 1263: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1264: len = 0;
1265: else {
1.13 markus 1266: /*
1267: * An error or EOF was encountered. Put an
1268: * error message to stderr buffer.
1269: */
1.11 markus 1270: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1271: buffer_append(&stderr_buffer, buf, strlen(buf));
1272: quit_pending = 1;
1273: return;
1274: }
1275: }
1276: /* Consume printed data from the buffer. */
1277: buffer_consume(&stdout_buffer, len);
1.57 markus 1278: stdout_bytes += len;
1.11 markus 1279: }
1280: /* Write buffered output to stderr. */
1281: if (FD_ISSET(fileno(stderr), writeset)) {
1282: /* Write as much data as possible. */
1283: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1284: buffer_len(&stderr_buffer));
1.11 markus 1285: if (len <= 0) {
1.64 markus 1286: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1287: len = 0;
1288: else {
1.13 markus 1289: /* EOF or error, but can't even print error message. */
1.11 markus 1290: quit_pending = 1;
1291: return;
1292: }
1293: }
1294: /* Consume printed characters from the buffer. */
1295: buffer_consume(&stderr_buffer, len);
1.57 markus 1296: stderr_bytes += len;
1.11 markus 1297: }
1.1 deraadt 1298: }
1299:
1.13 markus 1300: /*
1.15 markus 1301: * Get packets from the connection input buffer, and process them as long as
1302: * there are packets available.
1303: *
1304: * Any unknown packets received during the actual
1305: * session cause the session to terminate. This is
1306: * intended to make debugging easier since no
1307: * confirmations are sent. Any compatible protocol
1308: * extensions must be negotiated during the
1309: * preparatory phase.
1310: */
1311:
1.77 itojun 1312: static void
1.49 itojun 1313: client_process_buffered_input_packets(void)
1.15 markus 1314: {
1.54 markus 1315: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1316: }
1317:
1.31 markus 1318: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1319:
1.77 itojun 1320: static int
1.31 markus 1321: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1322: {
1.31 markus 1323: /* XXX we assume c->extended is writeable */
1324: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1325: }
1326:
1.77 itojun 1327: static void
1.60 markus 1328: client_channel_closed(int id, void *arg)
1329: {
1.83 markus 1330: channel_cancel_cleanup(id);
1.60 markus 1331: session_closed = 1;
1.113 markus 1332: leave_raw_mode();
1.60 markus 1333: }
1334:
1.15 markus 1335: /*
1.13 markus 1336: * Implements the interactive session with the server. This is called after
1337: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1338: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1339: * used as an escape character for terminating or suspending the session.
1.13 markus 1340: */
1.1 deraadt 1341:
1.20 markus 1342: int
1.30 markus 1343: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1344: {
1.46 markus 1345: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1346: double start_time, total_time;
1.130 avsm 1347: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1348: u_int nalloc = 0;
1.11 markus 1349: char buf[100];
1350:
1351: debug("Entering interactive session.");
1352:
1353: start_time = get_current_time();
1354:
1355: /* Initialize variables. */
1356: escape_pending = 0;
1357: last_was_cr = 1;
1358: exit_status = -1;
1359: stdin_eof = 0;
1360: buffer_high = 64 * 1024;
1361: connection_in = packet_get_connection_in();
1362: connection_out = packet_get_connection_out();
1.46 markus 1363: max_fd = MAX(connection_in, connection_out);
1.123 djm 1364: if (control_fd != -1)
1365: max_fd = MAX(max_fd, control_fd);
1.46 markus 1366:
1367: if (!compat20) {
1.63 markus 1368: /* enable nonblocking unless tty */
1369: if (!isatty(fileno(stdin)))
1370: set_nonblock(fileno(stdin));
1371: if (!isatty(fileno(stdout)))
1372: set_nonblock(fileno(stdout));
1373: if (!isatty(fileno(stderr)))
1374: set_nonblock(fileno(stderr));
1.46 markus 1375: max_fd = MAX(max_fd, fileno(stdin));
1376: max_fd = MAX(max_fd, fileno(stdout));
1377: max_fd = MAX(max_fd, fileno(stderr));
1378: }
1.11 markus 1379: stdin_bytes = 0;
1380: stdout_bytes = 0;
1381: stderr_bytes = 0;
1382: quit_pending = 0;
1383: escape_char = escape_char_arg;
1384:
1385: /* Initialize buffers. */
1386: buffer_init(&stdin_buffer);
1387: buffer_init(&stdout_buffer);
1388: buffer_init(&stderr_buffer);
1389:
1.15 markus 1390: client_init_dispatch();
1391:
1.105 markus 1392: /*
1393: * Set signal handlers, (e.g. to restore non-blocking mode)
1394: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1395: */
1.131 djm 1396: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1397: signal(SIGHUP, signal_handler);
1.105 markus 1398: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1399: signal(SIGINT, signal_handler);
1400: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1401: signal(SIGQUIT, signal_handler);
1402: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1403: signal(SIGTERM, signal_handler);
1.132 djm 1404: signal(SIGWINCH, window_change_handler);
1.11 markus 1405:
1406: if (have_pty)
1407: enter_raw_mode();
1408:
1.48 markus 1409: if (compat20) {
1410: session_ident = ssh2_chan_id;
1.72 stevesk 1411: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1412: channel_register_filter(session_ident,
1.149 reyk 1413: simple_escape_filter, NULL);
1.60 markus 1414: if (session_ident != -1)
1415: channel_register_cleanup(session_ident,
1.143 djm 1416: client_channel_closed, 0);
1.48 markus 1417: } else {
1418: /* Check if we should immediately send eof on stdin. */
1.16 markus 1419: client_check_initial_eof_on_stdin();
1.48 markus 1420: }
1.30 markus 1421:
1.11 markus 1422: /* Main loop of the client for the interactive session mode. */
1423: while (!quit_pending) {
1424:
1.13 markus 1425: /* Process buffered packets sent by the server. */
1.11 markus 1426: client_process_buffered_input_packets();
1427:
1.60 markus 1428: if (compat20 && session_closed && !channel_still_open())
1429: break;
1430:
1.56 markus 1431: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1432:
1.56 markus 1433: if (rekeying) {
1434: debug("rekeying in progress");
1435: } else {
1436: /*
1437: * Make packets of buffered stdin data, and buffer
1438: * them for sending to the server.
1439: */
1440: if (!compat20)
1441: client_make_packets_from_stdin_data();
1.11 markus 1442:
1.56 markus 1443: /*
1444: * Make packets from buffered channel data, and
1445: * enqueue them for sending to the server.
1446: */
1447: if (packet_not_very_much_data_to_write())
1448: channel_output_poll();
1.11 markus 1449:
1.56 markus 1450: /*
1451: * Check if the window size has changed, and buffer a
1452: * message about it to the server if so.
1453: */
1454: client_check_window_change();
1.11 markus 1455:
1.56 markus 1456: if (quit_pending)
1457: break;
1458: }
1.13 markus 1459: /*
1460: * Wait until we have something to do (something becomes
1461: * available on one of the descriptors).
1462: */
1.81 markus 1463: max_fd2 = max_fd;
1.56 markus 1464: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1465: &max_fd2, &nalloc, rekeying);
1.11 markus 1466:
1467: if (quit_pending)
1468: break;
1469:
1.56 markus 1470: /* Do channel operations unless rekeying in progress. */
1471: if (!rekeying) {
1472: channel_after_select(readset, writeset);
1.108 markus 1473: if (need_rekeying || packet_need_rekeying()) {
1474: debug("need rekeying");
1.56 markus 1475: xxx_kex->done = 0;
1476: kex_send_kexinit(xxx_kex);
1477: need_rekeying = 0;
1478: }
1479: }
1.11 markus 1480:
1.17 markus 1481: /* Buffer input from the connection. */
1.46 markus 1482: client_process_net_input(readset);
1.17 markus 1483:
1.123 djm 1484: /* Accept control connections. */
1485: client_process_control(readset);
1486:
1.17 markus 1487: if (quit_pending)
1488: break;
1.11 markus 1489:
1.17 markus 1490: if (!compat20) {
1491: /* Buffer data from stdin */
1.46 markus 1492: client_process_input(readset);
1.17 markus 1493: /*
1494: * Process output to stdout and stderr. Output to
1495: * the connection is processed elsewhere (above).
1496: */
1.46 markus 1497: client_process_output(writeset);
1.17 markus 1498: }
1.11 markus 1499:
1.13 markus 1500: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1501: if (FD_ISSET(connection_out, writeset))
1.11 markus 1502: packet_write_poll();
1503: }
1.46 markus 1504: if (readset)
1505: xfree(readset);
1506: if (writeset)
1507: xfree(writeset);
1.11 markus 1508:
1509: /* Terminate the session. */
1510:
1511: /* Stop watching for window change. */
1.132 djm 1512: signal(SIGWINCH, SIG_DFL);
1.11 markus 1513:
1.76 markus 1514: channel_free_all();
1.11 markus 1515:
1.75 markus 1516: if (have_pty)
1517: leave_raw_mode();
1518:
1519: /* restore blocking io */
1520: if (!isatty(fileno(stdin)))
1521: unset_nonblock(fileno(stdin));
1522: if (!isatty(fileno(stdout)))
1523: unset_nonblock(fileno(stdout));
1524: if (!isatty(fileno(stderr)))
1525: unset_nonblock(fileno(stderr));
1.116 dtucker 1526:
1527: /*
1528: * If there was no shell or command requested, there will be no remote
1529: * exit status to be returned. In that case, clear error code if the
1530: * connection was deliberately terminated at this end.
1531: */
1532: if (no_shell_flag && received_signal == SIGTERM) {
1533: received_signal = 0;
1534: exit_status = 0;
1535: }
1.75 markus 1536:
1.113 markus 1537: if (received_signal)
1.89 itojun 1538: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1539:
1.13 markus 1540: /*
1541: * In interactive mode (with pseudo tty) display a message indicating
1542: * that the connection has been closed.
1543: */
1.11 markus 1544: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1545: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1546: buffer_append(&stderr_buffer, buf, strlen(buf));
1547: }
1.70 markus 1548:
1.11 markus 1549: /* Output any buffered data for stdout. */
1.70 markus 1550: while (buffer_len(&stdout_buffer) > 0) {
1551: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1552: buffer_len(&stdout_buffer));
1.70 markus 1553: if (len <= 0) {
1.11 markus 1554: error("Write failed flushing stdout buffer.");
1.70 markus 1555: break;
1556: }
1.11 markus 1557: buffer_consume(&stdout_buffer, len);
1.57 markus 1558: stdout_bytes += len;
1.11 markus 1559: }
1560:
1561: /* Output any buffered data for stderr. */
1.70 markus 1562: while (buffer_len(&stderr_buffer) > 0) {
1563: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1564: buffer_len(&stderr_buffer));
1.70 markus 1565: if (len <= 0) {
1.11 markus 1566: error("Write failed flushing stderr buffer.");
1.70 markus 1567: break;
1568: }
1.11 markus 1569: buffer_consume(&stderr_buffer, len);
1.57 markus 1570: stderr_bytes += len;
1.11 markus 1571: }
1572:
1573: /* Clear and free any buffers. */
1574: memset(buf, 0, sizeof(buf));
1575: buffer_free(&stdin_buffer);
1576: buffer_free(&stdout_buffer);
1577: buffer_free(&stderr_buffer);
1578:
1579: /* Report bytes transferred, and transfer rates. */
1580: total_time = get_current_time() - start_time;
1581: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1582: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1583: if (total_time > 0)
1584: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1585: stdin_bytes / total_time, stdout_bytes / total_time,
1586: stderr_bytes / total_time);
1.11 markus 1587:
1588: /* Return the exit status of the program. */
1589: debug("Exit status %d", exit_status);
1590: return exit_status;
1.15 markus 1591: }
1592:
1593: /*********/
1594:
1.77 itojun 1595: static void
1.94 markus 1596: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1597: {
1.42 markus 1598: u_int data_len;
1.15 markus 1599: char *data = packet_get_string(&data_len);
1.93 markus 1600: packet_check_eom();
1.15 markus 1601: buffer_append(&stdout_buffer, data, data_len);
1602: memset(data, 0, data_len);
1603: xfree(data);
1604: }
1.77 itojun 1605: static void
1.94 markus 1606: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1607: {
1.42 markus 1608: u_int data_len;
1.15 markus 1609: char *data = packet_get_string(&data_len);
1.93 markus 1610: packet_check_eom();
1.15 markus 1611: buffer_append(&stderr_buffer, data, data_len);
1612: memset(data, 0, data_len);
1613: xfree(data);
1614: }
1.77 itojun 1615: static void
1.94 markus 1616: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1617: {
1618: exit_status = packet_get_int();
1.93 markus 1619: packet_check_eom();
1.15 markus 1620: /* Acknowledge the exit. */
1621: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1622: packet_send();
1623: /*
1624: * Must wait for packet to be sent since we are
1625: * exiting the loop.
1626: */
1627: packet_write_wait();
1628: /* Flag that we want to exit. */
1629: quit_pending = 1;
1630: }
1.115 markus 1631: static void
1632: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1633: {
1634: Channel *c = NULL;
1635: int remote_id, sock;
1636:
1637: /* Read the remote channel number from the message. */
1638: remote_id = packet_get_int();
1639: packet_check_eom();
1640:
1641: /*
1642: * Get a connection to the local authentication agent (this may again
1643: * get forwarded).
1644: */
1645: sock = ssh_get_authentication_socket();
1646:
1647: /*
1648: * If we could not connect the agent, send an error message back to
1649: * the server. This should never happen unless the agent dies,
1650: * because authentication forwarding is only enabled if we have an
1651: * agent.
1652: */
1653: if (sock >= 0) {
1654: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1655: -1, 0, 0, 0, "authentication agent connection", 1);
1656: c->remote_id = remote_id;
1657: c->force_drain = 1;
1658: }
1659: if (c == NULL) {
1660: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1661: packet_put_int(remote_id);
1662: } else {
1663: /* Send a confirmation to the remote host. */
1664: debug("Forwarding authentication connection.");
1665: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1666: packet_put_int(remote_id);
1667: packet_put_int(c->self);
1668: }
1669: packet_send();
1670: }
1.15 markus 1671:
1.77 itojun 1672: static Channel *
1.40 markus 1673: client_request_forwarded_tcpip(const char *request_type, int rchan)
1674: {
1.103 deraadt 1675: Channel *c = NULL;
1.40 markus 1676: char *listen_address, *originator_address;
1677: int listen_port, originator_port;
1.67 markus 1678: int sock;
1.40 markus 1679:
1680: /* Get rest of the packet */
1681: listen_address = packet_get_string(NULL);
1682: listen_port = packet_get_int();
1683: originator_address = packet_get_string(NULL);
1684: originator_port = packet_get_int();
1.93 markus 1685: packet_check_eom();
1.40 markus 1686:
1687: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1688: listen_address, listen_port, originator_address, originator_port);
1689:
1.80 stevesk 1690: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1691: if (sock < 0) {
1692: xfree(originator_address);
1693: xfree(listen_address);
1694: return NULL;
1695: }
1696: c = channel_new("forwarded-tcpip",
1697: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1698: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1699: originator_address, 1);
1.40 markus 1700: xfree(originator_address);
1701: xfree(listen_address);
1702: return c;
1703: }
1704:
1.103 deraadt 1705: static Channel *
1.40 markus 1706: client_request_x11(const char *request_type, int rchan)
1707: {
1708: Channel *c = NULL;
1709: char *originator;
1710: int originator_port;
1.67 markus 1711: int sock;
1.40 markus 1712:
1713: if (!options.forward_x11) {
1714: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1715: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1716: return NULL;
1717: }
1718: originator = packet_get_string(NULL);
1719: if (datafellows & SSH_BUG_X11FWD) {
1720: debug2("buggy server: x11 request w/o originator_port");
1721: originator_port = 0;
1722: } else {
1723: originator_port = packet_get_int();
1724: }
1.93 markus 1725: packet_check_eom();
1.40 markus 1726: /* XXX check permission */
1.47 markus 1727: debug("client_request_x11: request from %s %d", originator,
1728: originator_port);
1.67 markus 1729: xfree(originator);
1.40 markus 1730: sock = x11_connect_display();
1.67 markus 1731: if (sock < 0)
1732: return NULL;
1733: c = channel_new("x11",
1734: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1735: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1736: c->force_drain = 1;
1.40 markus 1737: return c;
1738: }
1739:
1.103 deraadt 1740: static Channel *
1.40 markus 1741: client_request_agent(const char *request_type, int rchan)
1742: {
1743: Channel *c = NULL;
1.67 markus 1744: int sock;
1.40 markus 1745:
1746: if (!options.forward_agent) {
1747: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1748: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1749: return NULL;
1750: }
1751: sock = ssh_get_authentication_socket();
1.67 markus 1752: if (sock < 0)
1753: return NULL;
1754: c = channel_new("authentication agent connection",
1755: SSH_CHANNEL_OPEN, sock, sock, -1,
1756: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1757: "authentication agent connection", 1);
1.82 markus 1758: c->force_drain = 1;
1.40 markus 1759: return c;
1760: }
1761:
1.22 markus 1762: /* XXXX move to generic input handler */
1.77 itojun 1763: static void
1.94 markus 1764: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1765: {
1766: Channel *c = NULL;
1767: char *ctype;
1768: int rchan;
1.102 markus 1769: u_int rmaxpack, rwindow, len;
1.22 markus 1770:
1771: ctype = packet_get_string(&len);
1772: rchan = packet_get_int();
1773: rwindow = packet_get_int();
1774: rmaxpack = packet_get_int();
1775:
1.24 markus 1776: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1777: ctype, rchan, rwindow, rmaxpack);
1778:
1.40 markus 1779: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1780: c = client_request_forwarded_tcpip(ctype, rchan);
1781: } else if (strcmp(ctype, "x11") == 0) {
1782: c = client_request_x11(ctype, rchan);
1783: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1784: c = client_request_agent(ctype, rchan);
1.22 markus 1785: }
1786: /* XXX duplicate : */
1787: if (c != NULL) {
1788: debug("confirm %s", ctype);
1789: c->remote_id = rchan;
1790: c->remote_window = rwindow;
1791: c->remote_maxpacket = rmaxpack;
1.69 markus 1792: if (c->type != SSH_CHANNEL_CONNECTING) {
1793: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1794: packet_put_int(c->remote_id);
1795: packet_put_int(c->self);
1796: packet_put_int(c->local_window);
1797: packet_put_int(c->local_maxpacket);
1798: packet_send();
1799: }
1.22 markus 1800: } else {
1801: debug("failure %s", ctype);
1802: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1803: packet_put_int(rchan);
1804: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1805: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1806: packet_put_cstring("open failed");
1.66 markus 1807: packet_put_cstring("");
1808: }
1.22 markus 1809: packet_send();
1810: }
1811: xfree(ctype);
1812: }
1.77 itojun 1813: static void
1.94 markus 1814: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1815: {
1816: Channel *c = NULL;
1.123 djm 1817: int exitval, id, reply, success = 0;
1.48 markus 1818: char *rtype;
1819:
1820: id = packet_get_int();
1821: rtype = packet_get_string(NULL);
1822: reply = packet_get_char();
1823:
1824: debug("client_input_channel_req: channel %d rtype %s reply %d",
1825: id, rtype, reply);
1826:
1.128 djm 1827: if (id == -1) {
1828: error("client_input_channel_req: request for channel -1");
1829: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1830: error("client_input_channel_req: channel %d: unknown channel", id);
1831: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1832: exitval = packet_get_int();
1833: if (id == session_ident) {
1834: success = 1;
1835: exit_status = exitval;
1836: } else if (c->ctl_fd == -1) {
1837: error("client_input_channel_req: unexpected channel %d",
1838: session_ident);
1839: } else {
1840: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1841: success = 1;
1842: }
1.93 markus 1843: packet_check_eom();
1.48 markus 1844: }
1845: if (reply) {
1846: packet_start(success ?
1847: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1848: packet_put_int(id);
1.48 markus 1849: packet_send();
1850: }
1851: xfree(rtype);
1852: }
1.95 markus 1853: static void
1854: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1855: {
1856: char *rtype;
1857: int want_reply;
1858: int success = 0;
1859:
1860: rtype = packet_get_string(NULL);
1861: want_reply = packet_get_char();
1.117 markus 1862: debug("client_input_global_request: rtype %s want_reply %d",
1863: rtype, want_reply);
1.95 markus 1864: if (want_reply) {
1865: packet_start(success ?
1866: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1867: packet_send();
1868: packet_write_wait();
1869: }
1870: xfree(rtype);
1871: }
1.22 markus 1872:
1.123 djm 1873: void
1.129 deraadt 1874: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1875: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1876: dispatch_fn *subsys_repl)
1877: {
1878: int len;
1.132 djm 1879: Channel *c = NULL;
1.123 djm 1880:
1881: debug2("%s: id %d", __func__, id);
1882:
1.132 djm 1883: if ((c = channel_lookup(id)) == NULL)
1884: fatal("client_session2_setup: channel %d: unknown channel", id);
1885:
1.123 djm 1886: if (want_tty) {
1887: struct winsize ws;
1888: struct termios tio;
1889:
1890: /* Store window size in the packet. */
1891: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1892: memset(&ws, 0, sizeof(ws));
1893:
1894: channel_request_start(id, "pty-req", 0);
1895: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1896: packet_put_int((u_int)ws.ws_col);
1897: packet_put_int((u_int)ws.ws_row);
1898: packet_put_int((u_int)ws.ws_xpixel);
1899: packet_put_int((u_int)ws.ws_ypixel);
1.123 djm 1900: tio = get_saved_tio();
1901: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1902: packet_send();
1903: /* XXX wait for reply */
1.132 djm 1904: c->client_tty = 1;
1.123 djm 1905: }
1906:
1907: /* Transfer any environment variables from client to server */
1.126 djm 1908: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1909: int i, j, matched;
1910: char *name, *val;
1911:
1912: debug("Sending environment.");
1.126 djm 1913: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1914: /* Split */
1.126 djm 1915: name = xstrdup(env[i]);
1.123 djm 1916: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1917: xfree(name);
1.123 djm 1918: continue;
1919: }
1920: *val++ = '\0';
1921:
1922: matched = 0;
1923: for (j = 0; j < options.num_send_env; j++) {
1924: if (match_pattern(name, options.send_env[j])) {
1925: matched = 1;
1926: break;
1927: }
1928: }
1929: if (!matched) {
1930: debug3("Ignored env %s", name);
1.144 stevesk 1931: xfree(name);
1.123 djm 1932: continue;
1933: }
1934:
1935: debug("Sending env %s = %s", name, val);
1936: channel_request_start(id, "env", 0);
1937: packet_put_cstring(name);
1938: packet_put_cstring(val);
1939: packet_send();
1.144 stevesk 1940: xfree(name);
1.123 djm 1941: }
1942: }
1943:
1944: len = buffer_len(cmd);
1945: if (len > 0) {
1946: if (len > 900)
1947: len = 900;
1948: if (want_subsystem) {
1949: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1950: channel_request_start(id, "subsystem", subsys_repl != NULL);
1951: if (subsys_repl != NULL) {
1952: /* register callback for reply */
1953: /* XXX we assume that client_loop has already been called */
1954: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1955: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1956: }
1957: } else {
1958: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1959: channel_request_start(id, "exec", 0);
1960: }
1961: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1962: packet_send();
1963: } else {
1964: channel_request_start(id, "shell", 0);
1965: packet_send();
1966: }
1967: }
1968:
1.77 itojun 1969: static void
1.49 itojun 1970: client_init_dispatch_20(void)
1.16 markus 1971: {
1.55 markus 1972: dispatch_init(&dispatch_protocol_error);
1.100 markus 1973:
1.16 markus 1974: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1975: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1976: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1977: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1978: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1979: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1980: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1981: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1982: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1983: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1984:
1985: /* rekeying */
1986: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1987:
1988: /* global request reply messages */
1989: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1990: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1991: }
1.77 itojun 1992: static void
1.49 itojun 1993: client_init_dispatch_13(void)
1.15 markus 1994: {
1995: dispatch_init(NULL);
1996: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1997: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1998: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1999: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2000: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2001: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2002: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2003: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2004: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2005:
2006: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2007: &client_input_agent_open : &deny_input_open);
1.39 markus 2008: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2009: &x11_input_open : &deny_input_open);
1.15 markus 2010: }
1.77 itojun 2011: static void
1.49 itojun 2012: client_init_dispatch_15(void)
1.15 markus 2013: {
2014: client_init_dispatch_13();
2015: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2016: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2017: }
1.79 stevesk 2018: static void
1.49 itojun 2019: client_init_dispatch(void)
1.15 markus 2020: {
1.16 markus 2021: if (compat20)
2022: client_init_dispatch_20();
2023: else if (compat13)
1.15 markus 2024: client_init_dispatch_13();
2025: else
2026: client_init_dispatch_15();
1.113 markus 2027: }
2028:
2029: /* client specific fatal cleanup */
2030: void
1.114 markus 2031: cleanup_exit(int i)
1.113 markus 2032: {
2033: leave_raw_mode();
2034: leave_non_blocking();
1.123 djm 2035: if (options.control_path != NULL && control_fd != -1)
2036: unlink(options.control_path);
1.114 markus 2037: _exit(i);
1.1 deraadt 2038: }
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