Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.167
1.167 ! markus 1: /* $OpenBSD: clientloop.c,v 1.166 2006/07/08 21:47:12 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>
1.150 stevesk 68:
1.155 stevesk 69: #include <ctype.h>
1.151 stevesk 70: #include <paths.h>
1.153 stevesk 71: #include <signal.h>
1.150 stevesk 72: #include <termios.h>
1.1 deraadt 73:
1.45 markus 74: #include "ssh.h"
75: #include "ssh1.h"
76: #include "ssh2.h"
1.1 deraadt 77: #include "xmalloc.h"
78: #include "packet.h"
79: #include "buffer.h"
1.15 markus 80: #include "compat.h"
1.74 markus 81: #include "channels.h"
1.15 markus 82: #include "dispatch.h"
1.30 markus 83: #include "buffer.h"
84: #include "bufaux.h"
1.40 markus 85: #include "key.h"
1.54 markus 86: #include "kex.h"
1.45 markus 87: #include "log.h"
88: #include "readconf.h"
89: #include "clientloop.h"
1.147 djm 90: #include "sshconnect.h"
1.40 markus 91: #include "authfd.h"
1.45 markus 92: #include "atomicio.h"
1.118 deraadt 93: #include "sshpty.h"
1.63 markus 94: #include "misc.h"
1.123 djm 95: #include "monitor_fdpass.h"
96: #include "match.h"
97: #include "msg.h"
1.39 markus 98:
99: /* import options */
100: extern Options options;
101:
1.1 deraadt 102: /* Flag indicating that stdin should be redirected from /dev/null. */
103: extern int stdin_null_flag;
104:
1.116 dtucker 105: /* Flag indicating that no shell has been requested */
106: extern int no_shell_flag;
107:
1.123 djm 108: /* Control socket */
109: extern int control_fd;
110:
1.13 markus 111: /*
112: * Name of the host we are connecting to. This is the name given on the
113: * command line, or the HostName specified for the user-supplied name in a
114: * configuration file.
115: */
1.1 deraadt 116: extern char *host;
117:
1.13 markus 118: /*
119: * Flag to indicate that we have received a window change signal which has
120: * not yet been processed. This will cause a message indicating the new
121: * window size to be sent to the server a little later. This is volatile
122: * because this is updated in a signal handler.
123: */
1.88 markus 124: static volatile sig_atomic_t received_window_change_signal = 0;
125: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 126:
1.145 djm 127: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 128: static int in_non_blocking_mode = 0;
129:
130: /* Common data for the client loop code. */
1.162 djm 131: static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.31 markus 132: static int escape_char; /* Escape character. */
1.11 markus 133: static int escape_pending; /* Last character was the escape character */
134: static int last_was_cr; /* Last character was a newline. */
135: static int exit_status; /* Used to store the exit status of the command. */
136: static int stdin_eof; /* EOF has been encountered on standard error. */
137: static Buffer stdin_buffer; /* Buffer for stdin data. */
138: static Buffer stdout_buffer; /* Buffer for stdout data. */
139: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 140: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
141: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 142: static int connection_in; /* Connection to server (input). */
143: static int connection_out; /* Connection to server (output). */
1.56 markus 144: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 145: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 146: static int server_alive_timeouts = 0;
1.1 deraadt 147:
1.77 itojun 148: static void client_init_dispatch(void);
1.16 markus 149: int session_ident = -1;
150:
1.123 djm 151: struct confirm_ctx {
152: int want_tty;
153: int want_subsys;
1.140 djm 154: int want_x_fwd;
155: int want_agent_fwd;
1.123 djm 156: Buffer cmd;
157: char *term;
158: struct termios tio;
1.126 djm 159: char **env;
1.123 djm 160: };
161:
1.54 markus 162: /*XXX*/
163: extern Kex *xxx_kex;
164:
1.123 djm 165: void ssh_process_session2_setup(int, int, int, Buffer *);
166:
1.1 deraadt 167: /* Restores stdin to blocking mode. */
168:
1.77 itojun 169: static void
1.49 itojun 170: leave_non_blocking(void)
1.1 deraadt 171: {
1.11 markus 172: if (in_non_blocking_mode) {
1.125 djm 173: unset_nonblock(fileno(stdin));
1.11 markus 174: in_non_blocking_mode = 0;
175: }
1.1 deraadt 176: }
177:
1.11 markus 178: /* Puts stdin terminal in non-blocking mode. */
179:
1.77 itojun 180: static void
1.49 itojun 181: enter_non_blocking(void)
1.1 deraadt 182: {
1.11 markus 183: in_non_blocking_mode = 1;
1.124 djm 184: set_nonblock(fileno(stdin));
1.1 deraadt 185: }
186:
1.13 markus 187: /*
188: * Signal handler for the window change signal (SIGWINCH). This just sets a
189: * flag indicating that the window has changed.
190: */
1.157 deraadt 191: /*ARGSUSED */
1.77 itojun 192: static void
1.11 markus 193: window_change_handler(int sig)
1.1 deraadt 194: {
1.11 markus 195: received_window_change_signal = 1;
196: signal(SIGWINCH, window_change_handler);
1.1 deraadt 197: }
198:
1.13 markus 199: /*
200: * Signal handler for signals that cause the program to terminate. These
201: * signals must be trapped to restore terminal modes.
202: */
1.157 deraadt 203: /*ARGSUSED */
1.77 itojun 204: static void
1.11 markus 205: signal_handler(int sig)
1.1 deraadt 206: {
1.75 markus 207: received_signal = sig;
208: quit_pending = 1;
1.1 deraadt 209: }
210:
1.13 markus 211: /*
212: * Returns current time in seconds from Jan 1, 1970 with the maximum
213: * available resolution.
214: */
1.1 deraadt 215:
1.77 itojun 216: static double
1.49 itojun 217: get_current_time(void)
1.1 deraadt 218: {
1.11 markus 219: struct timeval tv;
220: gettimeofday(&tv, NULL);
221: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 222: }
223:
224: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
225: void
226: client_x11_get_proto(const char *display, const char *xauth_path,
227: u_int trusted, char **_proto, char **_data)
228: {
229: char cmd[1024];
230: char line[512];
231: char xdisplay[512];
232: static char proto[512], data[512];
233: FILE *f;
234: int got_data = 0, generated = 0, do_unlink = 0, i;
235: char *xauthdir, *xauthfile;
236: struct stat st;
237:
238: xauthdir = xauthfile = NULL;
239: *_proto = proto;
240: *_data = data;
241: proto[0] = data[0] = '\0';
242:
243: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
244: debug("No xauth program.");
245: } else {
246: if (display == NULL) {
247: debug("x11_get_proto: DISPLAY not set");
248: return;
249: }
250: /*
251: * Handle FamilyLocal case where $DISPLAY does
252: * not match an authorization entry. For this we
253: * just try "xauth list unix:displaynum.screennum".
254: * XXX: "localhost" match to determine FamilyLocal
255: * is not perfect.
256: */
257: if (strncmp(display, "localhost:", 10) == 0) {
258: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
259: display + 10);
260: display = xdisplay;
261: }
262: if (trusted == 0) {
263: xauthdir = xmalloc(MAXPATHLEN);
264: xauthfile = xmalloc(MAXPATHLEN);
265: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
266: if (mkdtemp(xauthdir) != NULL) {
267: do_unlink = 1;
268: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
269: xauthdir);
270: snprintf(cmd, sizeof(cmd),
271: "%s -f %s generate %s " SSH_X11_PROTO
272: " untrusted timeout 1200 2>" _PATH_DEVNULL,
273: xauth_path, xauthfile, display);
274: debug2("x11_get_proto: %s", cmd);
275: if (system(cmd) == 0)
276: generated = 1;
277: }
278: }
279: snprintf(cmd, sizeof(cmd),
1.142 markus 280: "%s %s%s list %s 2>" _PATH_DEVNULL,
1.138 djm 281: xauth_path,
282: generated ? "-f " : "" ,
283: generated ? xauthfile : "",
284: display);
285: debug2("x11_get_proto: %s", cmd);
286: f = popen(cmd, "r");
287: if (f && fgets(line, sizeof(line), f) &&
288: sscanf(line, "%*s %511s %511s", proto, data) == 2)
289: got_data = 1;
290: if (f)
291: pclose(f);
292: }
293:
294: if (do_unlink) {
295: unlink(xauthfile);
296: rmdir(xauthdir);
297: }
298: if (xauthdir)
299: xfree(xauthdir);
300: if (xauthfile)
301: xfree(xauthfile);
302:
303: /*
304: * If we didn't get authentication data, just make up some
305: * data. The forwarding code will check the validity of the
306: * response anyway, and substitute this data. The X11
307: * server, however, will ignore this fake data and use
308: * whatever authentication mechanisms it was using otherwise
309: * for the local connection.
310: */
311: if (!got_data) {
312: u_int32_t rnd = 0;
313:
314: logit("Warning: No xauth data; "
315: "using fake authentication data for X11 forwarding.");
316: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
317: for (i = 0; i < 16; i++) {
318: if (i % 4 == 0)
319: rnd = arc4random();
320: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
321: rnd & 0xff);
322: rnd >>= 8;
323: }
324: }
1.1 deraadt 325: }
326:
1.13 markus 327: /*
328: * This is called when the interactive is entered. This checks if there is
329: * an EOF coming on stdin. We must check this explicitly, as select() does
330: * not appear to wake up when redirecting from /dev/null.
331: */
1.1 deraadt 332:
1.77 itojun 333: static void
1.49 itojun 334: client_check_initial_eof_on_stdin(void)
1.1 deraadt 335: {
1.11 markus 336: int len;
337: char buf[1];
1.1 deraadt 338:
1.13 markus 339: /*
340: * If standard input is to be "redirected from /dev/null", we simply
341: * mark that we have seen an EOF and send an EOF message to the
342: * server. Otherwise, we try to read a single character; it appears
343: * that for some files, such /dev/null, select() never wakes up for
344: * read for this descriptor, which means that we never get EOF. This
345: * way we will get the EOF if stdin comes from /dev/null or similar.
346: */
1.11 markus 347: if (stdin_null_flag) {
348: /* Fake EOF on stdin. */
349: debug("Sending eof.");
350: stdin_eof = 1;
351: packet_start(SSH_CMSG_EOF);
352: packet_send();
353: } else {
354: enter_non_blocking();
355:
356: /* Check for immediate EOF on stdin. */
357: len = read(fileno(stdin), buf, 1);
358: if (len == 0) {
1.13 markus 359: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 360: debug("Sending eof.");
361: stdin_eof = 1;
362: packet_start(SSH_CMSG_EOF);
363: packet_send();
364: } else if (len > 0) {
1.13 markus 365: /*
366: * Got data. We must store the data in the buffer,
367: * and also process it as an escape character if
368: * appropriate.
369: */
1.42 markus 370: if ((u_char) buf[0] == escape_char)
1.11 markus 371: escape_pending = 1;
1.52 markus 372: else
1.11 markus 373: buffer_append(&stdin_buffer, buf, 1);
374: }
375: leave_non_blocking();
376: }
1.1 deraadt 377: }
378:
379:
1.13 markus 380: /*
381: * Make packets from buffered stdin data, and buffer them for sending to the
382: * connection.
383: */
1.1 deraadt 384:
1.77 itojun 385: static void
1.49 itojun 386: client_make_packets_from_stdin_data(void)
1.1 deraadt 387: {
1.42 markus 388: u_int len;
1.1 deraadt 389:
1.11 markus 390: /* Send buffered stdin data to the server. */
391: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 392: packet_not_very_much_data_to_write()) {
1.11 markus 393: len = buffer_len(&stdin_buffer);
394: /* Keep the packets at reasonable size. */
395: if (len > packet_get_maxsize())
396: len = packet_get_maxsize();
397: packet_start(SSH_CMSG_STDIN_DATA);
398: packet_put_string(buffer_ptr(&stdin_buffer), len);
399: packet_send();
400: buffer_consume(&stdin_buffer, len);
1.52 markus 401: stdin_bytes += len;
1.11 markus 402: /* If we have a pending EOF, send it now. */
403: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
404: packet_start(SSH_CMSG_EOF);
405: packet_send();
406: }
1.1 deraadt 407: }
408: }
409:
1.13 markus 410: /*
411: * Checks if the client window has changed, and sends a packet about it to
412: * the server if so. The actual change is detected elsewhere (by a software
413: * interrupt on Unix); this just checks the flag and sends a message if
414: * appropriate.
415: */
1.1 deraadt 416:
1.77 itojun 417: static void
1.49 itojun 418: client_check_window_change(void)
1.1 deraadt 419: {
1.16 markus 420: struct winsize ws;
421:
422: if (! received_window_change_signal)
423: return;
424: /** XXX race */
425: received_window_change_signal = 0;
426:
1.37 markus 427: debug2("client_check_window_change: changed");
1.16 markus 428:
429: if (compat20) {
1.123 djm 430: channel_send_window_changes();
1.16 markus 431: } else {
1.123 djm 432: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
433: return;
1.16 markus 434: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 435: packet_put_int((u_int)ws.ws_row);
436: packet_put_int((u_int)ws.ws_col);
437: packet_put_int((u_int)ws.ws_xpixel);
438: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 439: packet_send();
1.1 deraadt 440: }
441: }
442:
1.117 markus 443: static void
444: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
445: {
446: server_alive_timeouts = 0;
447: client_global_request_reply_fwd(type, seq, ctxt);
448: }
449:
450: static void
451: server_alive_check(void)
452: {
453: if (++server_alive_timeouts > options.server_alive_count_max)
454: packet_disconnect("Timeout, server not responding.");
455: packet_start(SSH2_MSG_GLOBAL_REQUEST);
456: packet_put_cstring("keepalive@openssh.com");
457: packet_put_char(1); /* boolean: want reply */
458: packet_send();
459: }
460:
1.13 markus 461: /*
462: * Waits until the client can do something (some data becomes available on
463: * one of the file descriptors).
464: */
1.77 itojun 465: static void
1.46 markus 466: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 467: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 468: {
1.117 markus 469: struct timeval tv, *tvp;
470: int ret;
471:
1.46 markus 472: /* Add any selections by the channel mechanism. */
1.81 markus 473: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 474:
1.16 markus 475: if (!compat20) {
1.17 markus 476: /* Read from the connection, unless our buffers are full. */
1.16 markus 477: if (buffer_len(&stdout_buffer) < buffer_high &&
478: buffer_len(&stderr_buffer) < buffer_high &&
479: channel_not_very_much_buffered_data())
1.46 markus 480: FD_SET(connection_in, *readsetp);
1.17 markus 481: /*
482: * Read from stdin, unless we have seen EOF or have very much
483: * buffered data to send to the server.
484: */
485: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 486: FD_SET(fileno(stdin), *readsetp);
1.17 markus 487:
488: /* Select stdout/stderr if have data in buffer. */
489: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 490: FD_SET(fileno(stdout), *writesetp);
1.17 markus 491: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 492: FD_SET(fileno(stderr), *writesetp);
1.16 markus 493: } else {
1.71 markus 494: /* channel_prepare_select could have closed the last channel */
1.84 markus 495: if (session_closed && !channel_still_open() &&
496: !packet_have_data_to_write()) {
497: /* clear mask since we did not call select() */
1.87 markus 498: memset(*readsetp, 0, *nallocp);
499: memset(*writesetp, 0, *nallocp);
1.84 markus 500: return;
1.71 markus 501: } else {
502: FD_SET(connection_in, *readsetp);
503: }
1.16 markus 504: }
1.11 markus 505:
506: /* Select server connection if have data to write to the server. */
507: if (packet_have_data_to_write())
1.46 markus 508: FD_SET(connection_out, *writesetp);
1.11 markus 509:
1.123 djm 510: if (control_fd != -1)
511: FD_SET(control_fd, *readsetp);
512:
1.13 markus 513: /*
514: * Wait for something to happen. This will suspend the process until
515: * some selected descriptor can be read, written, or has some other
1.117 markus 516: * event pending.
1.13 markus 517: */
1.11 markus 518:
1.117 markus 519: if (options.server_alive_interval == 0 || !compat20)
520: tvp = NULL;
1.129 deraadt 521: else {
1.117 markus 522: tv.tv_sec = options.server_alive_interval;
523: tv.tv_usec = 0;
524: tvp = &tv;
525: }
526: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
527: if (ret < 0) {
1.11 markus 528: char buf[100];
1.51 markus 529:
530: /*
531: * We have to clear the select masks, because we return.
532: * We have to return, because the mainloop checks for the flags
533: * set by the signal handlers.
534: */
1.87 markus 535: memset(*readsetp, 0, *nallocp);
536: memset(*writesetp, 0, *nallocp);
1.50 deraadt 537:
1.11 markus 538: if (errno == EINTR)
539: return;
540: /* Note: we might still have data in the buffers. */
541: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
542: buffer_append(&stderr_buffer, buf, strlen(buf));
543: quit_pending = 1;
1.117 markus 544: } else if (ret == 0)
545: server_alive_check();
1.11 markus 546: }
547:
1.77 itojun 548: static void
1.31 markus 549: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 550: {
1.11 markus 551: /* Flush stdout and stderr buffers. */
1.31 markus 552: if (buffer_len(bout) > 0)
1.112 deraadt 553: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 554: if (buffer_len(berr) > 0)
1.112 deraadt 555: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 556:
557: leave_raw_mode();
558:
1.13 markus 559: /*
560: * Free (and clear) the buffer to reduce the amount of data that gets
561: * written to swap.
562: */
1.31 markus 563: buffer_free(bin);
564: buffer_free(bout);
565: buffer_free(berr);
1.11 markus 566:
567: /* Send the suspend signal to the program itself. */
568: kill(getpid(), SIGTSTP);
569:
1.132 djm 570: /* Reset window sizes in case they have changed */
571: received_window_change_signal = 1;
1.11 markus 572:
573: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 574: buffer_init(bin);
575: buffer_init(bout);
576: buffer_init(berr);
1.11 markus 577:
578: enter_raw_mode();
579: }
580:
1.77 itojun 581: static void
1.161 deraadt 582: client_process_net_input(fd_set *readset)
1.11 markus 583: {
1.17 markus 584: int len;
585: char buf[8192];
1.11 markus 586:
1.13 markus 587: /*
588: * Read input from the server, and add any such data to the buffer of
589: * the packet subsystem.
590: */
1.11 markus 591: if (FD_ISSET(connection_in, readset)) {
592: /* Read as much as possible. */
593: len = read(connection_in, buf, sizeof(buf));
594: if (len == 0) {
595: /* Received EOF. The remote host has closed the connection. */
596: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
597: host);
1.1 deraadt 598: buffer_append(&stderr_buffer, buf, strlen(buf));
599: quit_pending = 1;
600: return;
1.11 markus 601: }
1.13 markus 602: /*
603: * There is a kernel bug on Solaris that causes select to
604: * sometimes wake up even though there is no data available.
605: */
1.53 millert 606: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 607: len = 0;
608:
609: if (len < 0) {
610: /* An error has encountered. Perhaps there is a network problem. */
611: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
612: host, strerror(errno));
613: buffer_append(&stderr_buffer, buf, strlen(buf));
614: quit_pending = 1;
615: return;
616: }
617: packet_process_incoming(buf, len);
618: }
1.17 markus 619: }
1.16 markus 620:
1.97 jakob 621: static void
1.123 djm 622: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
623: {
624: int id;
625: Channel *c;
1.129 deraadt 626:
1.123 djm 627: id = packet_get_int();
628: packet_check_eom();
629:
630: if ((c = channel_lookup(id)) == NULL) {
631: error("%s: no channel for id %d", __func__, id);
632: return;
633: }
634:
635: if (type == SSH2_MSG_CHANNEL_SUCCESS)
636: debug2("Request suceeded on channel %d", id);
637: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
638: error("Request failed on channel %d", id);
639: channel_free(c);
640: }
641: }
642:
643: static void
644: client_extra_session2_setup(int id, void *arg)
645: {
646: struct confirm_ctx *cctx = arg;
1.140 djm 647: const char *display;
1.123 djm 648: Channel *c;
1.126 djm 649: int i;
1.129 deraadt 650:
1.123 djm 651: if (cctx == NULL)
652: fatal("%s: cctx == NULL", __func__);
653: if ((c = channel_lookup(id)) == NULL)
654: fatal("%s: no channel for id %d", __func__, id);
655:
1.141 djm 656: display = getenv("DISPLAY");
1.140 djm 657: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
658: char *proto, *data;
659: /* Get reasonable local authentication information. */
660: client_x11_get_proto(display, options.xauth_location,
661: options.forward_x11_trusted, &proto, &data);
662: /* Request forwarding with authentication spoofing. */
663: debug("Requesting X11 forwarding with authentication spoofing.");
664: x11_request_forwarding_with_spoofing(id, display, proto, data);
665: /* XXX wait for reply */
666: }
667:
668: if (cctx->want_agent_fwd && options.forward_agent) {
669: debug("Requesting authentication agent forwarding.");
670: channel_request_start(id, "auth-agent-req@openssh.com", 0);
671: packet_send();
672: }
673:
1.129 deraadt 674: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 675: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 676: client_subsystem_reply);
1.127 djm 677:
1.123 djm 678: c->confirm_ctx = NULL;
679: buffer_free(&cctx->cmd);
1.126 djm 680: xfree(cctx->term);
681: if (cctx->env != NULL) {
682: for (i = 0; cctx->env[i] != NULL; i++)
683: xfree(cctx->env[i]);
684: xfree(cctx->env);
1.129 deraadt 685: }
1.126 djm 686: xfree(cctx);
1.123 djm 687: }
688:
689: static void
1.161 deraadt 690: client_process_control(fd_set *readset)
1.123 djm 691: {
692: Buffer m;
693: Channel *c;
1.139 djm 694: int client_fd, new_fd[3], ver, allowed;
1.123 djm 695: socklen_t addrlen;
696: struct sockaddr_storage addr;
697: struct confirm_ctx *cctx;
698: char *cmd;
1.139 djm 699: u_int i, len, env_len, command, flags;
1.123 djm 700: uid_t euid;
701: gid_t egid;
702:
703: /*
704: * Accept connection on control socket
705: */
706: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
707: return;
708:
709: memset(&addr, 0, sizeof(addr));
710: addrlen = sizeof(addr);
711: if ((client_fd = accept(control_fd,
712: (struct sockaddr*)&addr, &addrlen)) == -1) {
713: error("%s accept: %s", __func__, strerror(errno));
714: return;
715: }
716:
717: if (getpeereid(client_fd, &euid, &egid) < 0) {
718: error("%s getpeereid failed: %s", __func__, strerror(errno));
719: close(client_fd);
720: return;
721: }
722: if ((euid != 0) && (getuid() != euid)) {
723: error("control mode uid mismatch: peer euid %u != uid %u",
724: (u_int) euid, (u_int) getuid());
725: close(client_fd);
726: return;
727: }
1.127 djm 728:
1.134 djm 729: unset_nonblock(client_fd);
730:
731: /* Read command */
732: buffer_init(&m);
733: if (ssh_msg_recv(client_fd, &m) == -1) {
734: error("%s: client msg_recv failed", __func__);
735: close(client_fd);
736: buffer_free(&m);
737: return;
738: }
1.140 djm 739: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 740: error("%s: wrong client version %d", __func__, ver);
741: buffer_free(&m);
742: close(client_fd);
743: return;
744: }
745:
1.127 djm 746: allowed = 1;
1.134 djm 747: command = buffer_get_int(&m);
748: flags = buffer_get_int(&m);
1.123 djm 749:
1.134 djm 750: buffer_clear(&m);
1.123 djm 751:
1.134 djm 752: switch (command) {
753: case SSHMUX_COMMAND_OPEN:
1.137 djm 754: if (options.control_master == SSHCTL_MASTER_ASK ||
755: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 756: allowed = ask_permission("Allow shared connection "
757: "to %s? ", host);
758: /* continue below */
759: break;
760: case SSHMUX_COMMAND_TERMINATE:
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("Terminate shared connection "
764: "to %s? ", host);
765: if (allowed)
766: quit_pending = 1;
1.136 deraadt 767: /* FALLTHROUGH */
1.134 djm 768: case SSHMUX_COMMAND_ALIVE_CHECK:
769: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
770: buffer_clear(&m);
771: buffer_put_int(&m, allowed);
772: buffer_put_int(&m, getpid());
1.140 djm 773: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 774: error("%s: client msg_send failed", __func__);
775: close(client_fd);
776: buffer_free(&m);
777: return;
778: }
779: buffer_free(&m);
780: close(client_fd);
781: return;
782: default:
783: error("Unsupported command %d", command);
784: buffer_free(&m);
785: close(client_fd);
786: return;
787: }
1.123 djm 788:
1.134 djm 789: /* Reply for SSHMUX_COMMAND_OPEN */
790: buffer_clear(&m);
1.127 djm 791: buffer_put_int(&m, allowed);
1.123 djm 792: buffer_put_int(&m, getpid());
1.140 djm 793: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 794: error("%s: client msg_send failed", __func__);
795: close(client_fd);
1.127 djm 796: buffer_free(&m);
1.123 djm 797: return;
798: }
799:
1.127 djm 800: if (!allowed) {
801: error("Refused control connection");
802: close(client_fd);
803: buffer_free(&m);
804: return;
805: }
806:
1.134 djm 807: buffer_clear(&m);
1.123 djm 808: if (ssh_msg_recv(client_fd, &m) == -1) {
809: error("%s: client msg_recv failed", __func__);
810: close(client_fd);
1.127 djm 811: buffer_free(&m);
1.123 djm 812: return;
813: }
1.140 djm 814: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 815: error("%s: wrong client version %d", __func__, ver);
816: buffer_free(&m);
817: close(client_fd);
818: return;
819: }
820:
1.159 djm 821: cctx = xcalloc(1, sizeof(*cctx));
1.134 djm 822: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
823: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 824: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
825: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 826: cctx->term = buffer_get_string(&m, &len);
827:
828: cmd = buffer_get_string(&m, &len);
829: buffer_init(&cctx->cmd);
830: buffer_append(&cctx->cmd, cmd, strlen(cmd));
831:
1.126 djm 832: env_len = buffer_get_int(&m);
833: env_len = MIN(env_len, 4096);
834: debug3("%s: receiving %d env vars", __func__, env_len);
835: if (env_len != 0) {
1.159 djm 836: cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
1.126 djm 837: for (i = 0; i < env_len; i++)
838: cctx->env[i] = buffer_get_string(&m, &len);
839: cctx->env[i] = NULL;
840: }
841:
1.123 djm 842: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
843: cctx->want_tty, cctx->want_subsys, cmd);
1.163 markus 844: xfree(cmd);
1.123 djm 845:
846: /* Gather fds from client */
847: new_fd[0] = mm_receive_fd(client_fd);
848: new_fd[1] = mm_receive_fd(client_fd);
849: new_fd[2] = mm_receive_fd(client_fd);
850:
851: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
852: new_fd[0], new_fd[1], new_fd[2]);
853:
854: /* Try to pick up ttymodes from client before it goes raw */
855: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
856: error("%s: tcgetattr: %s", __func__, strerror(errno));
857:
1.134 djm 858: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 859: buffer_clear(&m);
1.140 djm 860: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 861: error("%s: client msg_send failed", __func__);
862: close(client_fd);
863: close(new_fd[0]);
864: close(new_fd[1]);
865: close(new_fd[2]);
1.127 djm 866: buffer_free(&m);
1.134 djm 867: xfree(cctx->term);
868: if (env_len != 0) {
869: for (i = 0; i < env_len; i++)
870: xfree(cctx->env[i]);
871: xfree(cctx->env);
872: }
1.123 djm 873: return;
874: }
875: buffer_free(&m);
876:
877: /* enable nonblocking unless tty */
878: if (!isatty(new_fd[0]))
879: set_nonblock(new_fd[0]);
880: if (!isatty(new_fd[1]))
881: set_nonblock(new_fd[1]);
882: if (!isatty(new_fd[2]))
883: set_nonblock(new_fd[2]);
884:
885: set_nonblock(client_fd);
886:
1.129 deraadt 887: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 888: new_fd[0], new_fd[1], new_fd[2],
889: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
890: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
891:
892: /* XXX */
893: c->ctl_fd = client_fd;
894:
895: debug3("%s: channel_new: %d", __func__, c->self);
896:
897: channel_send_open(c->self);
898: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
899: }
900:
901: static void
1.99 markus 902: process_cmdline(void)
1.97 jakob 903: {
904: void (*handler)(int);
1.135 djm 905: char *s, *cmd, *cancel_host;
1.121 djm 906: int delete = 0;
1.97 jakob 907: int local = 0;
1.135 djm 908: u_short cancel_port;
909: Forward fwd;
1.97 jakob 910:
911: leave_raw_mode();
1.101 markus 912: handler = signal(SIGINT, SIG_IGN);
1.99 markus 913: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 914: if (s == NULL)
915: goto out;
916: while (*s && isspace(*s))
917: s++;
1.121 djm 918: if (*s == '-')
919: s++; /* Skip cmdline '-', if any */
1.120 dtucker 920: if (*s == '\0')
1.97 jakob 921: goto out;
1.121 djm 922:
1.122 djm 923: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 924: logit("Commands:");
1.164 djm 925: logit(" -L[bind_address:]port:host:hostport "
926: "Request local forward");
927: logit(" -R[bind_address:]port:host:hostport "
928: "Request remote forward");
1.165 stevesk 929: logit(" -KR[bind_address:]port "
1.164 djm 930: "Cancel remote forward");
1.146 reyk 931: if (!options.permit_local_command)
932: goto out;
1.164 djm 933: logit(" !args "
934: "Execute local command");
1.146 reyk 935: goto out;
936: }
937:
938: if (*s == '!' && options.permit_local_command) {
939: s++;
940: ssh_local_cmd(s);
1.121 djm 941: goto out;
942: }
943:
944: if (*s == 'K') {
945: delete = 1;
946: s++;
947: }
948: if (*s != 'L' && *s != 'R') {
1.109 itojun 949: logit("Invalid command.");
1.97 jakob 950: goto out;
951: }
1.121 djm 952: if (*s == 'L')
1.97 jakob 953: local = 1;
1.121 djm 954: if (local && delete) {
955: logit("Not supported.");
956: goto out;
957: }
958: if ((!local || delete) && !compat20) {
1.109 itojun 959: logit("Not supported for SSH protocol version 1.");
1.97 jakob 960: goto out;
961: }
1.121 djm 962:
963: s++;
1.97 jakob 964: while (*s && isspace(*s))
965: s++;
966:
1.121 djm 967: if (delete) {
1.135 djm 968: cancel_port = 0;
969: cancel_host = hpdelim(&s); /* may be NULL */
970: if (s != NULL) {
971: cancel_port = a2port(s);
972: cancel_host = cleanhostname(cancel_host);
973: } else {
974: cancel_port = a2port(cancel_host);
975: cancel_host = NULL;
1.121 djm 976: }
1.135 djm 977: if (cancel_port == 0) {
978: logit("Bad forwarding close port");
1.121 djm 979: goto out;
980: }
1.135 djm 981: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 982: } else {
1.135 djm 983: if (!parse_forward(&fwd, s)) {
1.121 djm 984: logit("Bad forwarding specification.");
985: goto out;
986: }
987: if (local) {
1.135 djm 988: if (channel_setup_local_fwd_listener(fwd.listen_host,
989: fwd.listen_port, fwd.connect_host,
990: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 991: logit("Port forwarding failed.");
992: goto out;
993: }
1.135 djm 994: } else {
1.167 ! markus 995: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 996: fwd.listen_port, fwd.connect_host,
1.167 ! markus 997: fwd.connect_port) < 0) {
! 998: logit("Port forwarding failed.");
! 999: goto out;
! 1000: }
1.135 djm 1001: }
1002:
1.121 djm 1003: logit("Forwarding port.");
1004: }
1005:
1.97 jakob 1006: out:
1007: signal(SIGINT, handler);
1008: enter_raw_mode();
1009: if (cmd)
1010: xfree(cmd);
1011: }
1012:
1.31 markus 1013: /* process the characters one by one */
1.77 itojun 1014: static int
1.31 markus 1015: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1016: {
1.32 markus 1017: char string[1024];
1.31 markus 1018: pid_t pid;
1019: int bytes = 0;
1.42 markus 1020: u_int i;
1021: u_char ch;
1.31 markus 1022: char *s;
1023:
1.139 djm 1024: if (len <= 0)
1025: return (0);
1026:
1027: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1028: /* Get one character at a time. */
1029: ch = buf[i];
1030:
1031: if (escape_pending) {
1032: /* We have previously seen an escape character. */
1033: /* Clear the flag now. */
1034: escape_pending = 0;
1035:
1036: /* Process the escaped character. */
1037: switch (ch) {
1038: case '.':
1039: /* Terminate the connection. */
1.32 markus 1040: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1041: buffer_append(berr, string, strlen(string));
1.31 markus 1042:
1043: quit_pending = 1;
1044: return -1;
1045:
1046: case 'Z' - 64:
1047: /* Suspend the program. */
1048: /* Print a message to that effect to the user. */
1.32 markus 1049: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1050: buffer_append(berr, string, strlen(string));
1.31 markus 1051:
1052: /* Restore terminal modes and suspend. */
1053: client_suspend_self(bin, bout, berr);
1054:
1055: /* We have been continued. */
1056: continue;
1057:
1.111 markus 1058: case 'B':
1059: if (compat20) {
1060: snprintf(string, sizeof string,
1061: "%cB\r\n", escape_char);
1062: buffer_append(berr, string,
1063: strlen(string));
1064: channel_request_start(session_ident,
1065: "break", 0);
1066: packet_put_int(1000);
1067: packet_send();
1068: }
1069: continue;
1070:
1.54 markus 1071: case 'R':
1.59 markus 1072: if (compat20) {
1073: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1074: logit("Server does not support re-keying");
1.59 markus 1075: else
1076: need_rekeying = 1;
1077: }
1.54 markus 1078: continue;
1079:
1.31 markus 1080: case '&':
1081: /*
1082: * Detach the program (continue to serve connections,
1083: * but put in background and no more new connections).
1084: */
1085: /* Restore tty modes. */
1086: leave_raw_mode();
1087:
1088: /* Stop listening for new connections. */
1.86 markus 1089: channel_stop_listening();
1.31 markus 1090:
1.86 markus 1091: snprintf(string, sizeof string,
1092: "%c& [backgrounded]\n", escape_char);
1093: buffer_append(berr, string, strlen(string));
1.31 markus 1094:
1095: /* Fork into background. */
1096: pid = fork();
1097: if (pid < 0) {
1098: error("fork: %.100s", strerror(errno));
1099: continue;
1100: }
1101: if (pid != 0) { /* This is the parent. */
1102: /* The parent just exits. */
1103: exit(0);
1104: }
1105: /* The child continues serving connections. */
1.86 markus 1106: if (compat20) {
1107: buffer_append(bin, "\004", 1);
1108: /* fake EOF on stdin */
1109: return -1;
1110: } else if (!stdin_eof) {
1111: /*
1112: * Sending SSH_CMSG_EOF alone does not always appear
1113: * to be enough. So we try to send an EOF character
1114: * first.
1115: */
1116: packet_start(SSH_CMSG_STDIN_DATA);
1117: packet_put_string("\004", 1);
1118: packet_send();
1119: /* Close stdin. */
1120: stdin_eof = 1;
1121: if (buffer_len(bin) == 0) {
1122: packet_start(SSH_CMSG_EOF);
1123: packet_send();
1124: }
1125: }
1126: continue;
1.31 markus 1127:
1128: case '?':
1.32 markus 1129: snprintf(string, sizeof string,
1.31 markus 1130: "%c?\r\n\
1131: Supported escape sequences:\r\n\
1.104 stevesk 1132: %c. - terminate connection\r\n\
1.111 markus 1133: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1134: %cC - open a command line\r\n\
1135: %cR - Request rekey (SSH protocol 2 only)\r\n\
1136: %c^Z - suspend ssh\r\n\
1137: %c# - list forwarded connections\r\n\
1138: %c& - background ssh (when waiting for connections to terminate)\r\n\
1139: %c? - this message\r\n\
1140: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1141: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1142: escape_char, escape_char, escape_char, escape_char,
1143: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1144: escape_char, escape_char, escape_char);
1.32 markus 1145: buffer_append(berr, string, strlen(string));
1.31 markus 1146: continue;
1147:
1148: case '#':
1.32 markus 1149: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1150: buffer_append(berr, string, strlen(string));
1.31 markus 1151: s = channel_open_message();
1152: buffer_append(berr, s, strlen(s));
1153: xfree(s);
1.97 jakob 1154: continue;
1155:
1156: case 'C':
1.99 markus 1157: process_cmdline();
1.31 markus 1158: continue;
1159:
1160: default:
1161: if (ch != escape_char) {
1162: buffer_put_char(bin, escape_char);
1163: bytes++;
1164: }
1165: /* Escaped characters fall through here */
1166: break;
1167: }
1168: } else {
1169: /*
1170: * The previous character was not an escape char. Check if this
1171: * is an escape.
1172: */
1173: if (last_was_cr && ch == escape_char) {
1174: /* It is. Set the flag and continue to next character. */
1175: escape_pending = 1;
1176: continue;
1177: }
1178: }
1179:
1180: /*
1181: * Normal character. Record whether it was a newline,
1182: * and append it to the buffer.
1183: */
1184: last_was_cr = (ch == '\r' || ch == '\n');
1185: buffer_put_char(bin, ch);
1186: bytes++;
1187: }
1188: return bytes;
1189: }
1190:
1.77 itojun 1191: static void
1.161 deraadt 1192: client_process_input(fd_set *readset)
1.17 markus 1193: {
1.21 deraadt 1194: int len;
1.31 markus 1195: char buf[8192];
1.16 markus 1196:
1.11 markus 1197: /* Read input from stdin. */
1198: if (FD_ISSET(fileno(stdin), readset)) {
1199: /* Read as much as possible. */
1200: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1201: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1202: return; /* we'll try again later */
1.11 markus 1203: if (len <= 0) {
1.13 markus 1204: /*
1205: * Received EOF or error. They are treated
1206: * similarly, except that an error message is printed
1207: * if it was an error condition.
1208: */
1.11 markus 1209: if (len < 0) {
1210: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1211: buffer_append(&stderr_buffer, buf, strlen(buf));
1212: }
1213: /* Mark that we have seen EOF. */
1214: stdin_eof = 1;
1.13 markus 1215: /*
1216: * Send an EOF message to the server unless there is
1217: * data in the buffer. If there is data in the
1218: * buffer, no message will be sent now. Code
1219: * elsewhere will send the EOF when the buffer
1220: * becomes empty if stdin_eof is set.
1221: */
1.11 markus 1222: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1223: packet_start(SSH_CMSG_EOF);
1224: packet_send();
1.11 markus 1225: }
1.72 stevesk 1226: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1227: /*
1228: * Normal successful read, and no escape character.
1229: * Just append the data to buffer.
1230: */
1.11 markus 1231: buffer_append(&stdin_buffer, buf, len);
1232: } else {
1.13 markus 1233: /*
1234: * Normal, successful read. But we have an escape character
1235: * and have to process the characters one by one.
1236: */
1.52 markus 1237: if (process_escapes(&stdin_buffer, &stdout_buffer,
1238: &stderr_buffer, buf, len) == -1)
1.31 markus 1239: return;
1.11 markus 1240: }
1241: }
1242: }
1243:
1.77 itojun 1244: static void
1.161 deraadt 1245: client_process_output(fd_set *writeset)
1.11 markus 1246: {
1247: int len;
1248: char buf[100];
1.1 deraadt 1249:
1.11 markus 1250: /* Write buffered output to stdout. */
1251: if (FD_ISSET(fileno(stdout), writeset)) {
1252: /* Write as much data as possible. */
1253: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1254: buffer_len(&stdout_buffer));
1.11 markus 1255: if (len <= 0) {
1.64 markus 1256: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1257: len = 0;
1258: else {
1.13 markus 1259: /*
1260: * An error or EOF was encountered. Put an
1261: * error message to stderr buffer.
1262: */
1.11 markus 1263: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1264: buffer_append(&stderr_buffer, buf, strlen(buf));
1265: quit_pending = 1;
1266: return;
1267: }
1268: }
1269: /* Consume printed data from the buffer. */
1270: buffer_consume(&stdout_buffer, len);
1.57 markus 1271: stdout_bytes += len;
1.11 markus 1272: }
1273: /* Write buffered output to stderr. */
1274: if (FD_ISSET(fileno(stderr), writeset)) {
1275: /* Write as much data as possible. */
1276: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1277: buffer_len(&stderr_buffer));
1.11 markus 1278: if (len <= 0) {
1.64 markus 1279: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1280: len = 0;
1281: else {
1.13 markus 1282: /* EOF or error, but can't even print error message. */
1.11 markus 1283: quit_pending = 1;
1284: return;
1285: }
1286: }
1287: /* Consume printed characters from the buffer. */
1288: buffer_consume(&stderr_buffer, len);
1.57 markus 1289: stderr_bytes += len;
1.11 markus 1290: }
1.1 deraadt 1291: }
1292:
1.13 markus 1293: /*
1.15 markus 1294: * Get packets from the connection input buffer, and process them as long as
1295: * there are packets available.
1296: *
1297: * Any unknown packets received during the actual
1298: * session cause the session to terminate. This is
1299: * intended to make debugging easier since no
1300: * confirmations are sent. Any compatible protocol
1301: * extensions must be negotiated during the
1302: * preparatory phase.
1303: */
1304:
1.77 itojun 1305: static void
1.49 itojun 1306: client_process_buffered_input_packets(void)
1.15 markus 1307: {
1.54 markus 1308: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1309: }
1310:
1.31 markus 1311: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1312:
1.77 itojun 1313: static int
1.31 markus 1314: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1315: {
1.31 markus 1316: /* XXX we assume c->extended is writeable */
1317: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1318: }
1319:
1.77 itojun 1320: static void
1.60 markus 1321: client_channel_closed(int id, void *arg)
1322: {
1.83 markus 1323: channel_cancel_cleanup(id);
1.60 markus 1324: session_closed = 1;
1.113 markus 1325: leave_raw_mode();
1.60 markus 1326: }
1327:
1.15 markus 1328: /*
1.13 markus 1329: * Implements the interactive session with the server. This is called after
1330: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1331: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1332: * used as an escape character for terminating or suspending the session.
1.13 markus 1333: */
1.1 deraadt 1334:
1.20 markus 1335: int
1.30 markus 1336: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1337: {
1.46 markus 1338: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1339: double start_time, total_time;
1.130 avsm 1340: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1341: u_int nalloc = 0;
1.11 markus 1342: char buf[100];
1343:
1344: debug("Entering interactive session.");
1345:
1346: start_time = get_current_time();
1347:
1348: /* Initialize variables. */
1349: escape_pending = 0;
1350: last_was_cr = 1;
1351: exit_status = -1;
1352: stdin_eof = 0;
1353: buffer_high = 64 * 1024;
1354: connection_in = packet_get_connection_in();
1355: connection_out = packet_get_connection_out();
1.46 markus 1356: max_fd = MAX(connection_in, connection_out);
1.123 djm 1357: if (control_fd != -1)
1358: max_fd = MAX(max_fd, control_fd);
1.46 markus 1359:
1360: if (!compat20) {
1.63 markus 1361: /* enable nonblocking unless tty */
1362: if (!isatty(fileno(stdin)))
1363: set_nonblock(fileno(stdin));
1364: if (!isatty(fileno(stdout)))
1365: set_nonblock(fileno(stdout));
1366: if (!isatty(fileno(stderr)))
1367: set_nonblock(fileno(stderr));
1.46 markus 1368: max_fd = MAX(max_fd, fileno(stdin));
1369: max_fd = MAX(max_fd, fileno(stdout));
1370: max_fd = MAX(max_fd, fileno(stderr));
1371: }
1.11 markus 1372: stdin_bytes = 0;
1373: stdout_bytes = 0;
1374: stderr_bytes = 0;
1375: quit_pending = 0;
1376: escape_char = escape_char_arg;
1377:
1378: /* Initialize buffers. */
1379: buffer_init(&stdin_buffer);
1380: buffer_init(&stdout_buffer);
1381: buffer_init(&stderr_buffer);
1382:
1.15 markus 1383: client_init_dispatch();
1384:
1.105 markus 1385: /*
1386: * Set signal handlers, (e.g. to restore non-blocking mode)
1387: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1388: */
1.131 djm 1389: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1390: signal(SIGHUP, signal_handler);
1.105 markus 1391: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1392: signal(SIGINT, signal_handler);
1393: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1394: signal(SIGQUIT, signal_handler);
1395: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1396: signal(SIGTERM, signal_handler);
1.132 djm 1397: signal(SIGWINCH, window_change_handler);
1.11 markus 1398:
1399: if (have_pty)
1400: enter_raw_mode();
1401:
1.48 markus 1402: if (compat20) {
1403: session_ident = ssh2_chan_id;
1.72 stevesk 1404: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1405: channel_register_filter(session_ident,
1.149 reyk 1406: simple_escape_filter, NULL);
1.60 markus 1407: if (session_ident != -1)
1408: channel_register_cleanup(session_ident,
1.143 djm 1409: client_channel_closed, 0);
1.48 markus 1410: } else {
1411: /* Check if we should immediately send eof on stdin. */
1.16 markus 1412: client_check_initial_eof_on_stdin();
1.48 markus 1413: }
1.30 markus 1414:
1.11 markus 1415: /* Main loop of the client for the interactive session mode. */
1416: while (!quit_pending) {
1417:
1.13 markus 1418: /* Process buffered packets sent by the server. */
1.11 markus 1419: client_process_buffered_input_packets();
1420:
1.60 markus 1421: if (compat20 && session_closed && !channel_still_open())
1422: break;
1423:
1.56 markus 1424: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1425:
1.56 markus 1426: if (rekeying) {
1427: debug("rekeying in progress");
1428: } else {
1429: /*
1430: * Make packets of buffered stdin data, and buffer
1431: * them for sending to the server.
1432: */
1433: if (!compat20)
1434: client_make_packets_from_stdin_data();
1.11 markus 1435:
1.56 markus 1436: /*
1437: * Make packets from buffered channel data, and
1438: * enqueue them for sending to the server.
1439: */
1440: if (packet_not_very_much_data_to_write())
1441: channel_output_poll();
1.11 markus 1442:
1.56 markus 1443: /*
1444: * Check if the window size has changed, and buffer a
1445: * message about it to the server if so.
1446: */
1447: client_check_window_change();
1.11 markus 1448:
1.56 markus 1449: if (quit_pending)
1450: break;
1451: }
1.13 markus 1452: /*
1453: * Wait until we have something to do (something becomes
1454: * available on one of the descriptors).
1455: */
1.81 markus 1456: max_fd2 = max_fd;
1.56 markus 1457: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1458: &max_fd2, &nalloc, rekeying);
1.11 markus 1459:
1460: if (quit_pending)
1461: break;
1462:
1.56 markus 1463: /* Do channel operations unless rekeying in progress. */
1464: if (!rekeying) {
1465: channel_after_select(readset, writeset);
1.108 markus 1466: if (need_rekeying || packet_need_rekeying()) {
1467: debug("need rekeying");
1.56 markus 1468: xxx_kex->done = 0;
1469: kex_send_kexinit(xxx_kex);
1470: need_rekeying = 0;
1471: }
1472: }
1.11 markus 1473:
1.17 markus 1474: /* Buffer input from the connection. */
1.46 markus 1475: client_process_net_input(readset);
1.17 markus 1476:
1.123 djm 1477: /* Accept control connections. */
1478: client_process_control(readset);
1479:
1.17 markus 1480: if (quit_pending)
1481: break;
1.11 markus 1482:
1.17 markus 1483: if (!compat20) {
1484: /* Buffer data from stdin */
1.46 markus 1485: client_process_input(readset);
1.17 markus 1486: /*
1487: * Process output to stdout and stderr. Output to
1488: * the connection is processed elsewhere (above).
1489: */
1.46 markus 1490: client_process_output(writeset);
1.17 markus 1491: }
1.11 markus 1492:
1.13 markus 1493: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1494: if (FD_ISSET(connection_out, writeset))
1.11 markus 1495: packet_write_poll();
1496: }
1.46 markus 1497: if (readset)
1498: xfree(readset);
1499: if (writeset)
1500: xfree(writeset);
1.11 markus 1501:
1502: /* Terminate the session. */
1503:
1504: /* Stop watching for window change. */
1.132 djm 1505: signal(SIGWINCH, SIG_DFL);
1.11 markus 1506:
1.76 markus 1507: channel_free_all();
1.11 markus 1508:
1.75 markus 1509: if (have_pty)
1510: leave_raw_mode();
1511:
1512: /* restore blocking io */
1513: if (!isatty(fileno(stdin)))
1514: unset_nonblock(fileno(stdin));
1515: if (!isatty(fileno(stdout)))
1516: unset_nonblock(fileno(stdout));
1517: if (!isatty(fileno(stderr)))
1518: unset_nonblock(fileno(stderr));
1.116 dtucker 1519:
1520: /*
1521: * If there was no shell or command requested, there will be no remote
1522: * exit status to be returned. In that case, clear error code if the
1523: * connection was deliberately terminated at this end.
1524: */
1525: if (no_shell_flag && received_signal == SIGTERM) {
1526: received_signal = 0;
1527: exit_status = 0;
1528: }
1.75 markus 1529:
1.113 markus 1530: if (received_signal)
1.89 itojun 1531: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1532:
1.13 markus 1533: /*
1534: * In interactive mode (with pseudo tty) display a message indicating
1535: * that the connection has been closed.
1536: */
1.11 markus 1537: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1538: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1539: buffer_append(&stderr_buffer, buf, strlen(buf));
1540: }
1.70 markus 1541:
1.11 markus 1542: /* Output any buffered data for stdout. */
1.70 markus 1543: while (buffer_len(&stdout_buffer) > 0) {
1544: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1545: buffer_len(&stdout_buffer));
1.70 markus 1546: if (len <= 0) {
1.11 markus 1547: error("Write failed flushing stdout buffer.");
1.70 markus 1548: break;
1549: }
1.11 markus 1550: buffer_consume(&stdout_buffer, len);
1.57 markus 1551: stdout_bytes += len;
1.11 markus 1552: }
1553:
1554: /* Output any buffered data for stderr. */
1.70 markus 1555: while (buffer_len(&stderr_buffer) > 0) {
1556: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1557: buffer_len(&stderr_buffer));
1.70 markus 1558: if (len <= 0) {
1.11 markus 1559: error("Write failed flushing stderr buffer.");
1.70 markus 1560: break;
1561: }
1.11 markus 1562: buffer_consume(&stderr_buffer, len);
1.57 markus 1563: stderr_bytes += len;
1.11 markus 1564: }
1565:
1566: /* Clear and free any buffers. */
1567: memset(buf, 0, sizeof(buf));
1568: buffer_free(&stdin_buffer);
1569: buffer_free(&stdout_buffer);
1570: buffer_free(&stderr_buffer);
1571:
1572: /* Report bytes transferred, and transfer rates. */
1573: total_time = get_current_time() - start_time;
1574: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1575: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1576: if (total_time > 0)
1577: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1578: stdin_bytes / total_time, stdout_bytes / total_time,
1579: stderr_bytes / total_time);
1.11 markus 1580:
1581: /* Return the exit status of the program. */
1582: debug("Exit status %d", exit_status);
1583: return exit_status;
1.15 markus 1584: }
1585:
1586: /*********/
1587:
1.77 itojun 1588: static void
1.94 markus 1589: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1590: {
1.42 markus 1591: u_int data_len;
1.15 markus 1592: char *data = packet_get_string(&data_len);
1.93 markus 1593: packet_check_eom();
1.15 markus 1594: buffer_append(&stdout_buffer, data, data_len);
1595: memset(data, 0, data_len);
1596: xfree(data);
1597: }
1.77 itojun 1598: static void
1.94 markus 1599: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1600: {
1.42 markus 1601: u_int data_len;
1.15 markus 1602: char *data = packet_get_string(&data_len);
1.93 markus 1603: packet_check_eom();
1.15 markus 1604: buffer_append(&stderr_buffer, data, data_len);
1605: memset(data, 0, data_len);
1606: xfree(data);
1607: }
1.77 itojun 1608: static void
1.94 markus 1609: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1610: {
1611: exit_status = packet_get_int();
1.93 markus 1612: packet_check_eom();
1.15 markus 1613: /* Acknowledge the exit. */
1614: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1615: packet_send();
1616: /*
1617: * Must wait for packet to be sent since we are
1618: * exiting the loop.
1619: */
1620: packet_write_wait();
1621: /* Flag that we want to exit. */
1622: quit_pending = 1;
1623: }
1.115 markus 1624: static void
1625: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1626: {
1627: Channel *c = NULL;
1628: int remote_id, sock;
1629:
1630: /* Read the remote channel number from the message. */
1631: remote_id = packet_get_int();
1632: packet_check_eom();
1633:
1634: /*
1635: * Get a connection to the local authentication agent (this may again
1636: * get forwarded).
1637: */
1638: sock = ssh_get_authentication_socket();
1639:
1640: /*
1641: * If we could not connect the agent, send an error message back to
1642: * the server. This should never happen unless the agent dies,
1643: * because authentication forwarding is only enabled if we have an
1644: * agent.
1645: */
1646: if (sock >= 0) {
1647: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1648: -1, 0, 0, 0, "authentication agent connection", 1);
1649: c->remote_id = remote_id;
1650: c->force_drain = 1;
1651: }
1652: if (c == NULL) {
1653: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1654: packet_put_int(remote_id);
1655: } else {
1656: /* Send a confirmation to the remote host. */
1657: debug("Forwarding authentication connection.");
1658: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1659: packet_put_int(remote_id);
1660: packet_put_int(c->self);
1661: }
1662: packet_send();
1663: }
1.15 markus 1664:
1.77 itojun 1665: static Channel *
1.40 markus 1666: client_request_forwarded_tcpip(const char *request_type, int rchan)
1667: {
1.103 deraadt 1668: Channel *c = NULL;
1.40 markus 1669: char *listen_address, *originator_address;
1670: int listen_port, originator_port;
1.67 markus 1671: int sock;
1.40 markus 1672:
1673: /* Get rest of the packet */
1674: listen_address = packet_get_string(NULL);
1675: listen_port = packet_get_int();
1676: originator_address = packet_get_string(NULL);
1677: originator_port = packet_get_int();
1.93 markus 1678: packet_check_eom();
1.40 markus 1679:
1680: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1681: listen_address, listen_port, originator_address, originator_port);
1682:
1.80 stevesk 1683: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1684: if (sock < 0) {
1685: xfree(originator_address);
1686: xfree(listen_address);
1687: return NULL;
1688: }
1689: c = channel_new("forwarded-tcpip",
1690: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1691: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1692: originator_address, 1);
1.40 markus 1693: xfree(originator_address);
1694: xfree(listen_address);
1695: return c;
1696: }
1697:
1.103 deraadt 1698: static Channel *
1.40 markus 1699: client_request_x11(const char *request_type, int rchan)
1700: {
1701: Channel *c = NULL;
1702: char *originator;
1703: int originator_port;
1.67 markus 1704: int sock;
1.40 markus 1705:
1706: if (!options.forward_x11) {
1707: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1708: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1709: return NULL;
1710: }
1711: originator = packet_get_string(NULL);
1712: if (datafellows & SSH_BUG_X11FWD) {
1713: debug2("buggy server: x11 request w/o originator_port");
1714: originator_port = 0;
1715: } else {
1716: originator_port = packet_get_int();
1717: }
1.93 markus 1718: packet_check_eom();
1.40 markus 1719: /* XXX check permission */
1.47 markus 1720: debug("client_request_x11: request from %s %d", originator,
1721: originator_port);
1.67 markus 1722: xfree(originator);
1.40 markus 1723: sock = x11_connect_display();
1.67 markus 1724: if (sock < 0)
1725: return NULL;
1726: c = channel_new("x11",
1727: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1728: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1729: c->force_drain = 1;
1.40 markus 1730: return c;
1731: }
1732:
1.103 deraadt 1733: static Channel *
1.40 markus 1734: client_request_agent(const char *request_type, int rchan)
1735: {
1736: Channel *c = NULL;
1.67 markus 1737: int sock;
1.40 markus 1738:
1739: if (!options.forward_agent) {
1740: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1741: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1742: return NULL;
1743: }
1744: sock = ssh_get_authentication_socket();
1.67 markus 1745: if (sock < 0)
1746: return NULL;
1747: c = channel_new("authentication agent connection",
1748: SSH_CHANNEL_OPEN, sock, sock, -1,
1749: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1750: "authentication agent connection", 1);
1.82 markus 1751: c->force_drain = 1;
1.40 markus 1752: return c;
1753: }
1754:
1.22 markus 1755: /* XXXX move to generic input handler */
1.77 itojun 1756: static void
1.94 markus 1757: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1758: {
1759: Channel *c = NULL;
1760: char *ctype;
1761: int rchan;
1.102 markus 1762: u_int rmaxpack, rwindow, len;
1.22 markus 1763:
1764: ctype = packet_get_string(&len);
1765: rchan = packet_get_int();
1766: rwindow = packet_get_int();
1767: rmaxpack = packet_get_int();
1768:
1.24 markus 1769: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1770: ctype, rchan, rwindow, rmaxpack);
1771:
1.40 markus 1772: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1773: c = client_request_forwarded_tcpip(ctype, rchan);
1774: } else if (strcmp(ctype, "x11") == 0) {
1775: c = client_request_x11(ctype, rchan);
1776: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1777: c = client_request_agent(ctype, rchan);
1.22 markus 1778: }
1779: /* XXX duplicate : */
1780: if (c != NULL) {
1781: debug("confirm %s", ctype);
1782: c->remote_id = rchan;
1783: c->remote_window = rwindow;
1784: c->remote_maxpacket = rmaxpack;
1.69 markus 1785: if (c->type != SSH_CHANNEL_CONNECTING) {
1786: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1787: packet_put_int(c->remote_id);
1788: packet_put_int(c->self);
1789: packet_put_int(c->local_window);
1790: packet_put_int(c->local_maxpacket);
1791: packet_send();
1792: }
1.22 markus 1793: } else {
1794: debug("failure %s", ctype);
1795: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1796: packet_put_int(rchan);
1797: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1798: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1799: packet_put_cstring("open failed");
1.66 markus 1800: packet_put_cstring("");
1801: }
1.22 markus 1802: packet_send();
1803: }
1804: xfree(ctype);
1805: }
1.77 itojun 1806: static void
1.94 markus 1807: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1808: {
1809: Channel *c = NULL;
1.123 djm 1810: int exitval, id, reply, success = 0;
1.48 markus 1811: char *rtype;
1812:
1813: id = packet_get_int();
1814: rtype = packet_get_string(NULL);
1815: reply = packet_get_char();
1816:
1817: debug("client_input_channel_req: channel %d rtype %s reply %d",
1818: id, rtype, reply);
1819:
1.128 djm 1820: if (id == -1) {
1821: error("client_input_channel_req: request for channel -1");
1822: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1823: error("client_input_channel_req: channel %d: unknown channel", id);
1824: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1825: exitval = packet_get_int();
1826: if (id == session_ident) {
1827: success = 1;
1828: exit_status = exitval;
1829: } else if (c->ctl_fd == -1) {
1830: error("client_input_channel_req: unexpected channel %d",
1831: session_ident);
1832: } else {
1833: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1834: success = 1;
1835: }
1.93 markus 1836: packet_check_eom();
1.48 markus 1837: }
1838: if (reply) {
1839: packet_start(success ?
1840: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1841: packet_put_int(id);
1.48 markus 1842: packet_send();
1843: }
1844: xfree(rtype);
1845: }
1.95 markus 1846: static void
1847: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1848: {
1849: char *rtype;
1850: int want_reply;
1851: int success = 0;
1852:
1853: rtype = packet_get_string(NULL);
1854: want_reply = packet_get_char();
1.117 markus 1855: debug("client_input_global_request: rtype %s want_reply %d",
1856: rtype, want_reply);
1.95 markus 1857: if (want_reply) {
1858: packet_start(success ?
1859: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1860: packet_send();
1861: packet_write_wait();
1862: }
1863: xfree(rtype);
1864: }
1.22 markus 1865:
1.123 djm 1866: void
1.129 deraadt 1867: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1868: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1869: dispatch_fn *subsys_repl)
1870: {
1871: int len;
1.132 djm 1872: Channel *c = NULL;
1.123 djm 1873:
1874: debug2("%s: id %d", __func__, id);
1875:
1.132 djm 1876: if ((c = channel_lookup(id)) == NULL)
1877: fatal("client_session2_setup: channel %d: unknown channel", id);
1878:
1.123 djm 1879: if (want_tty) {
1880: struct winsize ws;
1881: struct termios tio;
1882:
1883: /* Store window size in the packet. */
1884: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1885: memset(&ws, 0, sizeof(ws));
1886:
1887: channel_request_start(id, "pty-req", 0);
1888: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1889: packet_put_int((u_int)ws.ws_col);
1890: packet_put_int((u_int)ws.ws_row);
1891: packet_put_int((u_int)ws.ws_xpixel);
1892: packet_put_int((u_int)ws.ws_ypixel);
1.123 djm 1893: tio = get_saved_tio();
1894: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1895: packet_send();
1896: /* XXX wait for reply */
1.132 djm 1897: c->client_tty = 1;
1.123 djm 1898: }
1899:
1900: /* Transfer any environment variables from client to server */
1.126 djm 1901: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1902: int i, j, matched;
1903: char *name, *val;
1904:
1905: debug("Sending environment.");
1.126 djm 1906: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1907: /* Split */
1.126 djm 1908: name = xstrdup(env[i]);
1.123 djm 1909: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1910: xfree(name);
1.123 djm 1911: continue;
1912: }
1913: *val++ = '\0';
1914:
1915: matched = 0;
1916: for (j = 0; j < options.num_send_env; j++) {
1917: if (match_pattern(name, options.send_env[j])) {
1918: matched = 1;
1919: break;
1920: }
1921: }
1922: if (!matched) {
1923: debug3("Ignored env %s", name);
1.144 stevesk 1924: xfree(name);
1.123 djm 1925: continue;
1926: }
1927:
1928: debug("Sending env %s = %s", name, val);
1929: channel_request_start(id, "env", 0);
1930: packet_put_cstring(name);
1931: packet_put_cstring(val);
1932: packet_send();
1.144 stevesk 1933: xfree(name);
1.123 djm 1934: }
1935: }
1936:
1937: len = buffer_len(cmd);
1938: if (len > 0) {
1939: if (len > 900)
1940: len = 900;
1941: if (want_subsystem) {
1942: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1943: channel_request_start(id, "subsystem", subsys_repl != NULL);
1944: if (subsys_repl != NULL) {
1945: /* register callback for reply */
1946: /* XXX we assume that client_loop has already been called */
1947: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1948: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1949: }
1950: } else {
1951: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1952: channel_request_start(id, "exec", 0);
1953: }
1954: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1955: packet_send();
1956: } else {
1957: channel_request_start(id, "shell", 0);
1958: packet_send();
1959: }
1960: }
1961:
1.77 itojun 1962: static void
1.49 itojun 1963: client_init_dispatch_20(void)
1.16 markus 1964: {
1.55 markus 1965: dispatch_init(&dispatch_protocol_error);
1.100 markus 1966:
1.16 markus 1967: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1968: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1969: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1970: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1971: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1972: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1973: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1974: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1975: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1976: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1977:
1978: /* rekeying */
1979: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1980:
1981: /* global request reply messages */
1982: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1983: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1984: }
1.77 itojun 1985: static void
1.49 itojun 1986: client_init_dispatch_13(void)
1.15 markus 1987: {
1988: dispatch_init(NULL);
1989: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1990: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1991: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1992: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1993: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1994: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1995: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1996: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1997: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1998:
1999: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2000: &client_input_agent_open : &deny_input_open);
1.39 markus 2001: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2002: &x11_input_open : &deny_input_open);
1.15 markus 2003: }
1.77 itojun 2004: static void
1.49 itojun 2005: client_init_dispatch_15(void)
1.15 markus 2006: {
2007: client_init_dispatch_13();
2008: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2009: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2010: }
1.79 stevesk 2011: static void
1.49 itojun 2012: client_init_dispatch(void)
1.15 markus 2013: {
1.16 markus 2014: if (compat20)
2015: client_init_dispatch_20();
2016: else if (compat13)
1.15 markus 2017: client_init_dispatch_13();
2018: else
2019: client_init_dispatch_15();
1.113 markus 2020: }
2021:
2022: /* client specific fatal cleanup */
2023: void
1.114 markus 2024: cleanup_exit(int i)
1.113 markus 2025: {
2026: leave_raw_mode();
2027: leave_non_blocking();
1.123 djm 2028: if (options.control_path != NULL && control_fd != -1)
2029: unlink(options.control_path);
1.114 markus 2030: _exit(i);
1.1 deraadt 2031: }