Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.182
1.182 ! djm 1: /* $OpenBSD: clientloop.c,v 1.181 2007/08/15 08:14:46 markus Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.172 stevesk 68: #include <sys/param.h>
1.150 stevesk 69:
1.155 stevesk 70: #include <ctype.h>
1.168 stevesk 71: #include <errno.h>
1.151 stevesk 72: #include <paths.h>
1.153 stevesk 73: #include <signal.h>
1.174 stevesk 74: #include <stdio.h>
1.173 stevesk 75: #include <stdlib.h>
1.170 stevesk 76: #include <string.h>
1.150 stevesk 77: #include <termios.h>
1.175 deraadt 78: #include <pwd.h>
1.169 stevesk 79: #include <unistd.h>
1.1 deraadt 80:
1.175 deraadt 81: #include "xmalloc.h"
1.45 markus 82: #include "ssh.h"
83: #include "ssh1.h"
84: #include "ssh2.h"
1.1 deraadt 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"
1.40 markus 90: #include "key.h"
1.175 deraadt 91: #include "cipher.h"
1.54 markus 92: #include "kex.h"
1.45 markus 93: #include "log.h"
94: #include "readconf.h"
95: #include "clientloop.h"
1.147 djm 96: #include "sshconnect.h"
1.40 markus 97: #include "authfd.h"
1.45 markus 98: #include "atomicio.h"
1.118 deraadt 99: #include "sshpty.h"
1.63 markus 100: #include "misc.h"
1.123 djm 101: #include "monitor_fdpass.h"
102: #include "match.h"
103: #include "msg.h"
1.39 markus 104:
105: /* import options */
106: extern Options options;
107:
1.1 deraadt 108: /* Flag indicating that stdin should be redirected from /dev/null. */
109: extern int stdin_null_flag;
110:
1.116 dtucker 111: /* Flag indicating that no shell has been requested */
112: extern int no_shell_flag;
113:
1.123 djm 114: /* Control socket */
115: extern int control_fd;
116:
1.13 markus 117: /*
118: * Name of the host we are connecting to. This is the name given on the
119: * command line, or the HostName specified for the user-supplied name in a
120: * configuration file.
121: */
1.1 deraadt 122: extern char *host;
123:
1.13 markus 124: /*
125: * Flag to indicate that we have received a window change signal which has
126: * not yet been processed. This will cause a message indicating the new
127: * window size to be sent to the server a little later. This is volatile
128: * because this is updated in a signal handler.
129: */
1.88 markus 130: static volatile sig_atomic_t received_window_change_signal = 0;
131: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 132:
1.145 djm 133: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 134: static int in_non_blocking_mode = 0;
135:
136: /* Common data for the client loop code. */
1.162 djm 137: static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.31 markus 138: static int escape_char; /* Escape character. */
1.11 markus 139: static int escape_pending; /* Last character was the escape character */
140: static int last_was_cr; /* Last character was a newline. */
141: static int exit_status; /* Used to store the exit status of the command. */
142: static int stdin_eof; /* EOF has been encountered on standard error. */
143: static Buffer stdin_buffer; /* Buffer for stdin data. */
144: static Buffer stdout_buffer; /* Buffer for stdout data. */
145: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 146: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
147: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 148: static int connection_in; /* Connection to server (input). */
149: static int connection_out; /* Connection to server (output). */
1.56 markus 150: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 151: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 152: static int server_alive_timeouts = 0;
1.1 deraadt 153:
1.77 itojun 154: static void client_init_dispatch(void);
1.16 markus 155: int session_ident = -1;
156:
1.123 djm 157: struct confirm_ctx {
158: int want_tty;
159: int want_subsys;
1.140 djm 160: int want_x_fwd;
161: int want_agent_fwd;
1.123 djm 162: Buffer cmd;
163: char *term;
164: struct termios tio;
1.126 djm 165: char **env;
1.123 djm 166: };
167:
1.54 markus 168: /*XXX*/
169: extern Kex *xxx_kex;
170:
1.123 djm 171: void ssh_process_session2_setup(int, int, int, Buffer *);
172:
1.1 deraadt 173: /* Restores stdin to blocking mode. */
174:
1.77 itojun 175: static void
1.49 itojun 176: leave_non_blocking(void)
1.1 deraadt 177: {
1.11 markus 178: if (in_non_blocking_mode) {
1.125 djm 179: unset_nonblock(fileno(stdin));
1.11 markus 180: in_non_blocking_mode = 0;
181: }
1.1 deraadt 182: }
183:
1.11 markus 184: /* Puts stdin terminal in non-blocking mode. */
185:
1.77 itojun 186: static void
1.49 itojun 187: enter_non_blocking(void)
1.1 deraadt 188: {
1.11 markus 189: in_non_blocking_mode = 1;
1.124 djm 190: set_nonblock(fileno(stdin));
1.1 deraadt 191: }
192:
1.13 markus 193: /*
194: * Signal handler for the window change signal (SIGWINCH). This just sets a
195: * flag indicating that the window has changed.
196: */
1.157 deraadt 197: /*ARGSUSED */
1.77 itojun 198: static void
1.11 markus 199: window_change_handler(int sig)
1.1 deraadt 200: {
1.11 markus 201: received_window_change_signal = 1;
202: signal(SIGWINCH, window_change_handler);
1.1 deraadt 203: }
204:
1.13 markus 205: /*
206: * Signal handler for signals that cause the program to terminate. These
207: * signals must be trapped to restore terminal modes.
208: */
1.157 deraadt 209: /*ARGSUSED */
1.77 itojun 210: static void
1.11 markus 211: signal_handler(int sig)
1.1 deraadt 212: {
1.75 markus 213: received_signal = sig;
214: quit_pending = 1;
1.1 deraadt 215: }
216:
1.13 markus 217: /*
218: * Returns current time in seconds from Jan 1, 1970 with the maximum
219: * available resolution.
220: */
1.1 deraadt 221:
1.77 itojun 222: static double
1.49 itojun 223: get_current_time(void)
1.1 deraadt 224: {
1.11 markus 225: struct timeval tv;
226: gettimeofday(&tv, NULL);
227: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 228: }
229:
230: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
231: void
232: client_x11_get_proto(const char *display, const char *xauth_path,
233: u_int trusted, char **_proto, char **_data)
234: {
235: char cmd[1024];
236: char line[512];
237: char xdisplay[512];
238: static char proto[512], data[512];
239: FILE *f;
240: int got_data = 0, generated = 0, do_unlink = 0, i;
241: char *xauthdir, *xauthfile;
242: struct stat st;
243:
244: xauthdir = xauthfile = NULL;
245: *_proto = proto;
246: *_data = data;
247: proto[0] = data[0] = '\0';
248:
249: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
250: debug("No xauth program.");
251: } else {
252: if (display == NULL) {
253: debug("x11_get_proto: DISPLAY not set");
254: return;
255: }
256: /*
257: * Handle FamilyLocal case where $DISPLAY does
258: * not match an authorization entry. For this we
259: * just try "xauth list unix:displaynum.screennum".
260: * XXX: "localhost" match to determine FamilyLocal
261: * is not perfect.
262: */
263: if (strncmp(display, "localhost:", 10) == 0) {
264: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
265: display + 10);
266: display = xdisplay;
267: }
268: if (trusted == 0) {
269: xauthdir = xmalloc(MAXPATHLEN);
270: xauthfile = xmalloc(MAXPATHLEN);
271: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
272: if (mkdtemp(xauthdir) != NULL) {
273: do_unlink = 1;
274: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
275: xauthdir);
276: snprintf(cmd, sizeof(cmd),
277: "%s -f %s generate %s " SSH_X11_PROTO
278: " untrusted timeout 1200 2>" _PATH_DEVNULL,
279: xauth_path, xauthfile, display);
280: debug2("x11_get_proto: %s", cmd);
281: if (system(cmd) == 0)
282: generated = 1;
283: }
284: }
1.181 markus 285:
286: /*
287: * When in untrusted mode, we read the cookie only if it was
288: * successfully generated as an untrusted one in the step
289: * above.
290: */
291: if (trusted || generated) {
292: snprintf(cmd, sizeof(cmd),
293: "%s %s%s list %s 2>" _PATH_DEVNULL,
294: xauth_path,
295: generated ? "-f " : "" ,
296: generated ? xauthfile : "",
297: display);
298: debug2("x11_get_proto: %s", cmd);
299: f = popen(cmd, "r");
300: if (f && fgets(line, sizeof(line), f) &&
301: sscanf(line, "%*s %511s %511s", proto, data) == 2)
302: got_data = 1;
303: if (f)
304: pclose(f);
305: } else
306: error("Warning: untrusted X11 forwarding setup failed: "
307: "xauth key data not generated");
1.138 djm 308: }
309:
310: if (do_unlink) {
311: unlink(xauthfile);
312: rmdir(xauthdir);
313: }
314: if (xauthdir)
315: xfree(xauthdir);
316: if (xauthfile)
317: xfree(xauthfile);
318:
319: /*
320: * If we didn't get authentication data, just make up some
321: * data. The forwarding code will check the validity of the
322: * response anyway, and substitute this data. The X11
323: * server, however, will ignore this fake data and use
324: * whatever authentication mechanisms it was using otherwise
325: * for the local connection.
326: */
327: if (!got_data) {
328: u_int32_t rnd = 0;
329:
330: logit("Warning: No xauth data; "
331: "using fake authentication data for X11 forwarding.");
332: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
333: for (i = 0; i < 16; i++) {
334: if (i % 4 == 0)
335: rnd = arc4random();
336: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
337: rnd & 0xff);
338: rnd >>= 8;
339: }
340: }
1.1 deraadt 341: }
342:
1.13 markus 343: /*
344: * This is called when the interactive is entered. This checks if there is
345: * an EOF coming on stdin. We must check this explicitly, as select() does
346: * not appear to wake up when redirecting from /dev/null.
347: */
1.1 deraadt 348:
1.77 itojun 349: static void
1.49 itojun 350: client_check_initial_eof_on_stdin(void)
1.1 deraadt 351: {
1.11 markus 352: int len;
353: char buf[1];
1.1 deraadt 354:
1.13 markus 355: /*
356: * If standard input is to be "redirected from /dev/null", we simply
357: * mark that we have seen an EOF and send an EOF message to the
358: * server. Otherwise, we try to read a single character; it appears
359: * that for some files, such /dev/null, select() never wakes up for
360: * read for this descriptor, which means that we never get EOF. This
361: * way we will get the EOF if stdin comes from /dev/null or similar.
362: */
1.11 markus 363: if (stdin_null_flag) {
364: /* Fake EOF on stdin. */
365: debug("Sending eof.");
366: stdin_eof = 1;
367: packet_start(SSH_CMSG_EOF);
368: packet_send();
369: } else {
370: enter_non_blocking();
371:
372: /* Check for immediate EOF on stdin. */
373: len = read(fileno(stdin), buf, 1);
374: if (len == 0) {
1.13 markus 375: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 376: debug("Sending eof.");
377: stdin_eof = 1;
378: packet_start(SSH_CMSG_EOF);
379: packet_send();
380: } else if (len > 0) {
1.13 markus 381: /*
382: * Got data. We must store the data in the buffer,
383: * and also process it as an escape character if
384: * appropriate.
385: */
1.42 markus 386: if ((u_char) buf[0] == escape_char)
1.11 markus 387: escape_pending = 1;
1.52 markus 388: else
1.11 markus 389: buffer_append(&stdin_buffer, buf, 1);
390: }
391: leave_non_blocking();
392: }
1.1 deraadt 393: }
394:
395:
1.13 markus 396: /*
397: * Make packets from buffered stdin data, and buffer them for sending to the
398: * connection.
399: */
1.1 deraadt 400:
1.77 itojun 401: static void
1.49 itojun 402: client_make_packets_from_stdin_data(void)
1.1 deraadt 403: {
1.42 markus 404: u_int len;
1.1 deraadt 405:
1.11 markus 406: /* Send buffered stdin data to the server. */
407: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 408: packet_not_very_much_data_to_write()) {
1.11 markus 409: len = buffer_len(&stdin_buffer);
410: /* Keep the packets at reasonable size. */
411: if (len > packet_get_maxsize())
412: len = packet_get_maxsize();
413: packet_start(SSH_CMSG_STDIN_DATA);
414: packet_put_string(buffer_ptr(&stdin_buffer), len);
415: packet_send();
416: buffer_consume(&stdin_buffer, len);
1.52 markus 417: stdin_bytes += len;
1.11 markus 418: /* If we have a pending EOF, send it now. */
419: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
420: packet_start(SSH_CMSG_EOF);
421: packet_send();
422: }
1.1 deraadt 423: }
424: }
425:
1.13 markus 426: /*
427: * Checks if the client window has changed, and sends a packet about it to
428: * the server if so. The actual change is detected elsewhere (by a software
429: * interrupt on Unix); this just checks the flag and sends a message if
430: * appropriate.
431: */
1.1 deraadt 432:
1.77 itojun 433: static void
1.49 itojun 434: client_check_window_change(void)
1.1 deraadt 435: {
1.16 markus 436: struct winsize ws;
437:
438: if (! received_window_change_signal)
439: return;
440: /** XXX race */
441: received_window_change_signal = 0;
442:
1.37 markus 443: debug2("client_check_window_change: changed");
1.16 markus 444:
445: if (compat20) {
1.123 djm 446: channel_send_window_changes();
1.16 markus 447: } else {
1.123 djm 448: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
449: return;
1.16 markus 450: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 451: packet_put_int((u_int)ws.ws_row);
452: packet_put_int((u_int)ws.ws_col);
453: packet_put_int((u_int)ws.ws_xpixel);
454: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 455: packet_send();
1.1 deraadt 456: }
457: }
458:
1.117 markus 459: static void
460: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
461: {
462: server_alive_timeouts = 0;
463: client_global_request_reply_fwd(type, seq, ctxt);
464: }
465:
466: static void
467: server_alive_check(void)
468: {
1.176 markus 469: if (++server_alive_timeouts > options.server_alive_count_max) {
470: logit("Timeout, server not responding.");
471: cleanup_exit(255);
472: }
1.117 markus 473: packet_start(SSH2_MSG_GLOBAL_REQUEST);
474: packet_put_cstring("keepalive@openssh.com");
475: packet_put_char(1); /* boolean: want reply */
476: packet_send();
477: }
478:
1.13 markus 479: /*
480: * Waits until the client can do something (some data becomes available on
481: * one of the file descriptors).
482: */
1.77 itojun 483: static void
1.46 markus 484: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 485: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 486: {
1.117 markus 487: struct timeval tv, *tvp;
488: int ret;
489:
1.46 markus 490: /* Add any selections by the channel mechanism. */
1.81 markus 491: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 492:
1.16 markus 493: if (!compat20) {
1.17 markus 494: /* Read from the connection, unless our buffers are full. */
1.16 markus 495: if (buffer_len(&stdout_buffer) < buffer_high &&
496: buffer_len(&stderr_buffer) < buffer_high &&
497: channel_not_very_much_buffered_data())
1.46 markus 498: FD_SET(connection_in, *readsetp);
1.17 markus 499: /*
500: * Read from stdin, unless we have seen EOF or have very much
501: * buffered data to send to the server.
502: */
503: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 504: FD_SET(fileno(stdin), *readsetp);
1.17 markus 505:
506: /* Select stdout/stderr if have data in buffer. */
507: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 508: FD_SET(fileno(stdout), *writesetp);
1.17 markus 509: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 510: FD_SET(fileno(stderr), *writesetp);
1.16 markus 511: } else {
1.71 markus 512: /* channel_prepare_select could have closed the last channel */
1.84 markus 513: if (session_closed && !channel_still_open() &&
514: !packet_have_data_to_write()) {
515: /* clear mask since we did not call select() */
1.87 markus 516: memset(*readsetp, 0, *nallocp);
517: memset(*writesetp, 0, *nallocp);
1.84 markus 518: return;
1.71 markus 519: } else {
520: FD_SET(connection_in, *readsetp);
521: }
1.16 markus 522: }
1.11 markus 523:
524: /* Select server connection if have data to write to the server. */
525: if (packet_have_data_to_write())
1.46 markus 526: FD_SET(connection_out, *writesetp);
1.11 markus 527:
1.123 djm 528: if (control_fd != -1)
529: FD_SET(control_fd, *readsetp);
530:
1.13 markus 531: /*
532: * Wait for something to happen. This will suspend the process until
533: * some selected descriptor can be read, written, or has some other
1.117 markus 534: * event pending.
1.13 markus 535: */
1.11 markus 536:
1.117 markus 537: if (options.server_alive_interval == 0 || !compat20)
538: tvp = NULL;
1.129 deraadt 539: else {
1.117 markus 540: tv.tv_sec = options.server_alive_interval;
541: tv.tv_usec = 0;
542: tvp = &tv;
543: }
544: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
545: if (ret < 0) {
1.11 markus 546: char buf[100];
1.51 markus 547:
548: /*
549: * We have to clear the select masks, because we return.
550: * We have to return, because the mainloop checks for the flags
551: * set by the signal handlers.
552: */
1.87 markus 553: memset(*readsetp, 0, *nallocp);
554: memset(*writesetp, 0, *nallocp);
1.50 deraadt 555:
1.11 markus 556: if (errno == EINTR)
557: return;
558: /* Note: we might still have data in the buffers. */
559: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
560: buffer_append(&stderr_buffer, buf, strlen(buf));
561: quit_pending = 1;
1.117 markus 562: } else if (ret == 0)
563: server_alive_check();
1.11 markus 564: }
565:
1.77 itojun 566: static void
1.31 markus 567: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 568: {
1.11 markus 569: /* Flush stdout and stderr buffers. */
1.31 markus 570: if (buffer_len(bout) > 0)
1.112 deraadt 571: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 572: if (buffer_len(berr) > 0)
1.112 deraadt 573: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 574:
575: leave_raw_mode();
576:
1.13 markus 577: /*
578: * Free (and clear) the buffer to reduce the amount of data that gets
579: * written to swap.
580: */
1.31 markus 581: buffer_free(bin);
582: buffer_free(bout);
583: buffer_free(berr);
1.11 markus 584:
585: /* Send the suspend signal to the program itself. */
586: kill(getpid(), SIGTSTP);
587:
1.132 djm 588: /* Reset window sizes in case they have changed */
589: received_window_change_signal = 1;
1.11 markus 590:
591: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 592: buffer_init(bin);
593: buffer_init(bout);
594: buffer_init(berr);
1.11 markus 595:
596: enter_raw_mode();
597: }
598:
1.77 itojun 599: static void
1.161 deraadt 600: client_process_net_input(fd_set *readset)
1.11 markus 601: {
1.17 markus 602: int len;
603: char buf[8192];
1.11 markus 604:
1.13 markus 605: /*
606: * Read input from the server, and add any such data to the buffer of
607: * the packet subsystem.
608: */
1.11 markus 609: if (FD_ISSET(connection_in, readset)) {
610: /* Read as much as possible. */
611: len = read(connection_in, buf, sizeof(buf));
612: if (len == 0) {
613: /* Received EOF. The remote host has closed the connection. */
614: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
615: host);
1.1 deraadt 616: buffer_append(&stderr_buffer, buf, strlen(buf));
617: quit_pending = 1;
618: return;
1.11 markus 619: }
1.13 markus 620: /*
621: * There is a kernel bug on Solaris that causes select to
622: * sometimes wake up even though there is no data available.
623: */
1.53 millert 624: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 625: len = 0;
626:
627: if (len < 0) {
628: /* An error has encountered. Perhaps there is a network problem. */
629: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
630: host, strerror(errno));
631: buffer_append(&stderr_buffer, buf, strlen(buf));
632: quit_pending = 1;
633: return;
634: }
635: packet_process_incoming(buf, len);
636: }
1.17 markus 637: }
1.16 markus 638:
1.97 jakob 639: static void
1.123 djm 640: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
641: {
642: int id;
643: Channel *c;
1.129 deraadt 644:
1.123 djm 645: id = packet_get_int();
646: packet_check_eom();
647:
648: if ((c = channel_lookup(id)) == NULL) {
649: error("%s: no channel for id %d", __func__, id);
650: return;
651: }
652:
653: if (type == SSH2_MSG_CHANNEL_SUCCESS)
654: debug2("Request suceeded on channel %d", id);
655: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
656: error("Request failed on channel %d", id);
657: channel_free(c);
658: }
659: }
660:
661: static void
662: client_extra_session2_setup(int id, void *arg)
663: {
664: struct confirm_ctx *cctx = arg;
1.140 djm 665: const char *display;
1.123 djm 666: Channel *c;
1.126 djm 667: int i;
1.129 deraadt 668:
1.123 djm 669: if (cctx == NULL)
670: fatal("%s: cctx == NULL", __func__);
671: if ((c = channel_lookup(id)) == NULL)
672: fatal("%s: no channel for id %d", __func__, id);
673:
1.141 djm 674: display = getenv("DISPLAY");
1.140 djm 675: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
676: char *proto, *data;
677: /* Get reasonable local authentication information. */
678: client_x11_get_proto(display, options.xauth_location,
679: options.forward_x11_trusted, &proto, &data);
680: /* Request forwarding with authentication spoofing. */
681: debug("Requesting X11 forwarding with authentication spoofing.");
682: x11_request_forwarding_with_spoofing(id, display, proto, data);
683: /* XXX wait for reply */
684: }
685:
686: if (cctx->want_agent_fwd && options.forward_agent) {
687: debug("Requesting authentication agent forwarding.");
688: channel_request_start(id, "auth-agent-req@openssh.com", 0);
689: packet_send();
690: }
691:
1.129 deraadt 692: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 693: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 694: client_subsystem_reply);
1.127 djm 695:
1.123 djm 696: c->confirm_ctx = NULL;
697: buffer_free(&cctx->cmd);
1.126 djm 698: xfree(cctx->term);
699: if (cctx->env != NULL) {
700: for (i = 0; cctx->env[i] != NULL; i++)
701: xfree(cctx->env[i]);
702: xfree(cctx->env);
1.129 deraadt 703: }
1.126 djm 704: xfree(cctx);
1.123 djm 705: }
706:
707: static void
1.161 deraadt 708: client_process_control(fd_set *readset)
1.123 djm 709: {
710: Buffer m;
711: Channel *c;
1.178 djm 712: int client_fd, new_fd[3], ver, allowed, window, packetmax;
1.123 djm 713: socklen_t addrlen;
714: struct sockaddr_storage addr;
715: struct confirm_ctx *cctx;
716: char *cmd;
1.182 ! djm 717: u_int i, j, len, env_len, command, flags;
1.123 djm 718: uid_t euid;
719: gid_t egid;
720:
721: /*
722: * Accept connection on control socket
723: */
724: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
725: return;
726:
727: memset(&addr, 0, sizeof(addr));
728: addrlen = sizeof(addr);
729: if ((client_fd = accept(control_fd,
730: (struct sockaddr*)&addr, &addrlen)) == -1) {
731: error("%s accept: %s", __func__, strerror(errno));
732: return;
733: }
734:
735: if (getpeereid(client_fd, &euid, &egid) < 0) {
736: error("%s getpeereid failed: %s", __func__, strerror(errno));
737: close(client_fd);
738: return;
739: }
740: if ((euid != 0) && (getuid() != euid)) {
741: error("control mode uid mismatch: peer euid %u != uid %u",
742: (u_int) euid, (u_int) getuid());
743: close(client_fd);
744: return;
745: }
1.127 djm 746:
1.134 djm 747: unset_nonblock(client_fd);
748:
749: /* Read command */
750: buffer_init(&m);
751: if (ssh_msg_recv(client_fd, &m) == -1) {
752: error("%s: client msg_recv failed", __func__);
753: close(client_fd);
754: buffer_free(&m);
755: return;
756: }
1.140 djm 757: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 758: error("%s: wrong client version %d", __func__, ver);
759: buffer_free(&m);
760: close(client_fd);
761: return;
762: }
763:
1.127 djm 764: allowed = 1;
1.134 djm 765: command = buffer_get_int(&m);
766: flags = buffer_get_int(&m);
1.123 djm 767:
1.134 djm 768: buffer_clear(&m);
1.123 djm 769:
1.134 djm 770: switch (command) {
771: case SSHMUX_COMMAND_OPEN:
1.137 djm 772: if (options.control_master == SSHCTL_MASTER_ASK ||
773: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 774: allowed = ask_permission("Allow shared connection "
775: "to %s? ", host);
776: /* continue below */
777: break;
778: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 779: if (options.control_master == SSHCTL_MASTER_ASK ||
780: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 781: allowed = ask_permission("Terminate shared connection "
782: "to %s? ", host);
783: if (allowed)
784: quit_pending = 1;
1.136 deraadt 785: /* FALLTHROUGH */
1.134 djm 786: case SSHMUX_COMMAND_ALIVE_CHECK:
787: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
788: buffer_clear(&m);
789: buffer_put_int(&m, allowed);
790: buffer_put_int(&m, getpid());
1.140 djm 791: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 792: error("%s: client msg_send failed", __func__);
793: close(client_fd);
794: buffer_free(&m);
795: return;
796: }
797: buffer_free(&m);
798: close(client_fd);
799: return;
800: default:
801: error("Unsupported command %d", command);
802: buffer_free(&m);
803: close(client_fd);
804: return;
805: }
1.123 djm 806:
1.134 djm 807: /* Reply for SSHMUX_COMMAND_OPEN */
808: buffer_clear(&m);
1.127 djm 809: buffer_put_int(&m, allowed);
1.123 djm 810: buffer_put_int(&m, getpid());
1.140 djm 811: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 812: error("%s: client msg_send failed", __func__);
813: close(client_fd);
1.127 djm 814: buffer_free(&m);
1.123 djm 815: return;
816: }
817:
1.127 djm 818: if (!allowed) {
819: error("Refused control connection");
820: close(client_fd);
821: buffer_free(&m);
822: return;
823: }
824:
1.134 djm 825: buffer_clear(&m);
1.123 djm 826: if (ssh_msg_recv(client_fd, &m) == -1) {
827: error("%s: client msg_recv failed", __func__);
828: close(client_fd);
1.127 djm 829: buffer_free(&m);
1.123 djm 830: return;
831: }
1.140 djm 832: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 833: error("%s: wrong client version %d", __func__, ver);
834: buffer_free(&m);
835: close(client_fd);
836: return;
837: }
838:
1.159 djm 839: cctx = xcalloc(1, sizeof(*cctx));
1.134 djm 840: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
841: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 842: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
843: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 844: cctx->term = buffer_get_string(&m, &len);
845:
846: cmd = buffer_get_string(&m, &len);
847: buffer_init(&cctx->cmd);
848: buffer_append(&cctx->cmd, cmd, strlen(cmd));
849:
1.126 djm 850: env_len = buffer_get_int(&m);
851: env_len = MIN(env_len, 4096);
852: debug3("%s: receiving %d env vars", __func__, env_len);
853: if (env_len != 0) {
1.159 djm 854: cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
1.126 djm 855: for (i = 0; i < env_len; i++)
856: cctx->env[i] = buffer_get_string(&m, &len);
857: cctx->env[i] = NULL;
858: }
859:
1.123 djm 860: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
861: cctx->want_tty, cctx->want_subsys, cmd);
1.163 markus 862: xfree(cmd);
1.123 djm 863:
864: /* Gather fds from client */
1.182 ! djm 865: for(i = 0; i < 3; i++) {
! 866: if ((new_fd[i] = mm_receive_fd(client_fd)) == -1) {
! 867: error("%s: failed to receive fd %d from slave",
! 868: __func__, i);
! 869: for (j = 0; j < i; j++)
! 870: close(new_fd[j]);
! 871: for (j = 0; j < env_len; j++)
! 872: xfree(cctx->env[j]);
! 873: if (env_len > 0)
! 874: xfree(cctx->env);
! 875: xfree(cctx->term);
! 876: buffer_free(&cctx->cmd);
! 877: xfree(cctx);
! 878: return;
! 879: }
! 880: }
1.123 djm 881:
882: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
883: new_fd[0], new_fd[1], new_fd[2]);
884:
885: /* Try to pick up ttymodes from client before it goes raw */
886: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
887: error("%s: tcgetattr: %s", __func__, strerror(errno));
888:
1.134 djm 889: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 890: buffer_clear(&m);
1.140 djm 891: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 892: error("%s: client msg_send failed", __func__);
893: close(client_fd);
894: close(new_fd[0]);
895: close(new_fd[1]);
896: close(new_fd[2]);
1.127 djm 897: buffer_free(&m);
1.134 djm 898: xfree(cctx->term);
899: if (env_len != 0) {
900: for (i = 0; i < env_len; i++)
901: xfree(cctx->env[i]);
902: xfree(cctx->env);
903: }
1.123 djm 904: return;
905: }
906: buffer_free(&m);
907:
908: /* enable nonblocking unless tty */
909: if (!isatty(new_fd[0]))
910: set_nonblock(new_fd[0]);
911: if (!isatty(new_fd[1]))
912: set_nonblock(new_fd[1]);
913: if (!isatty(new_fd[2]))
914: set_nonblock(new_fd[2]);
915:
916: set_nonblock(client_fd);
917:
1.178 djm 918: window = CHAN_SES_WINDOW_DEFAULT;
919: packetmax = CHAN_SES_PACKET_DEFAULT;
920: if (cctx->want_tty) {
921: window >>= 1;
922: packetmax >>= 1;
923: }
924:
1.129 deraadt 925: c = channel_new("session", SSH_CHANNEL_OPENING,
1.178 djm 926: new_fd[0], new_fd[1], new_fd[2], window, packetmax,
1.123 djm 927: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
928:
929: /* XXX */
930: c->ctl_fd = client_fd;
931:
932: debug3("%s: channel_new: %d", __func__, c->self);
933:
934: channel_send_open(c->self);
935: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
936: }
937:
938: static void
1.99 markus 939: process_cmdline(void)
1.97 jakob 940: {
941: void (*handler)(int);
1.135 djm 942: char *s, *cmd, *cancel_host;
1.121 djm 943: int delete = 0;
1.97 jakob 944: int local = 0;
1.135 djm 945: u_short cancel_port;
946: Forward fwd;
1.97 jakob 947:
948: leave_raw_mode();
1.101 markus 949: handler = signal(SIGINT, SIG_IGN);
1.99 markus 950: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 951: if (s == NULL)
952: goto out;
1.179 tedu 953: while (isspace(*s))
1.97 jakob 954: s++;
1.121 djm 955: if (*s == '-')
956: s++; /* Skip cmdline '-', if any */
1.120 dtucker 957: if (*s == '\0')
1.97 jakob 958: goto out;
1.121 djm 959:
1.122 djm 960: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 961: logit("Commands:");
1.164 djm 962: logit(" -L[bind_address:]port:host:hostport "
963: "Request local forward");
964: logit(" -R[bind_address:]port:host:hostport "
965: "Request remote forward");
1.165 stevesk 966: logit(" -KR[bind_address:]port "
1.164 djm 967: "Cancel remote forward");
1.146 reyk 968: if (!options.permit_local_command)
969: goto out;
1.164 djm 970: logit(" !args "
971: "Execute local command");
1.146 reyk 972: goto out;
973: }
974:
975: if (*s == '!' && options.permit_local_command) {
976: s++;
977: ssh_local_cmd(s);
1.121 djm 978: goto out;
979: }
980:
981: if (*s == 'K') {
982: delete = 1;
983: s++;
984: }
985: if (*s != 'L' && *s != 'R') {
1.109 itojun 986: logit("Invalid command.");
1.97 jakob 987: goto out;
988: }
1.121 djm 989: if (*s == 'L')
1.97 jakob 990: local = 1;
1.121 djm 991: if (local && delete) {
992: logit("Not supported.");
993: goto out;
994: }
995: if ((!local || delete) && !compat20) {
1.109 itojun 996: logit("Not supported for SSH protocol version 1.");
1.97 jakob 997: goto out;
998: }
1.121 djm 999:
1.179 tedu 1000: while (isspace(*++s))
1001: ;
1.97 jakob 1002:
1.121 djm 1003: if (delete) {
1.135 djm 1004: cancel_port = 0;
1005: cancel_host = hpdelim(&s); /* may be NULL */
1006: if (s != NULL) {
1007: cancel_port = a2port(s);
1008: cancel_host = cleanhostname(cancel_host);
1009: } else {
1010: cancel_port = a2port(cancel_host);
1011: cancel_host = NULL;
1.121 djm 1012: }
1.135 djm 1013: if (cancel_port == 0) {
1014: logit("Bad forwarding close port");
1.121 djm 1015: goto out;
1016: }
1.135 djm 1017: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 1018: } else {
1.135 djm 1019: if (!parse_forward(&fwd, s)) {
1.121 djm 1020: logit("Bad forwarding specification.");
1021: goto out;
1022: }
1023: if (local) {
1.135 djm 1024: if (channel_setup_local_fwd_listener(fwd.listen_host,
1025: fwd.listen_port, fwd.connect_host,
1026: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 1027: logit("Port forwarding failed.");
1028: goto out;
1029: }
1.135 djm 1030: } else {
1.167 markus 1031: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 1032: fwd.listen_port, fwd.connect_host,
1.167 markus 1033: fwd.connect_port) < 0) {
1034: logit("Port forwarding failed.");
1035: goto out;
1036: }
1.135 djm 1037: }
1038:
1.121 djm 1039: logit("Forwarding port.");
1040: }
1041:
1.97 jakob 1042: out:
1043: signal(SIGINT, handler);
1044: enter_raw_mode();
1045: if (cmd)
1046: xfree(cmd);
1047: }
1048:
1.31 markus 1049: /* process the characters one by one */
1.77 itojun 1050: static int
1.31 markus 1051: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1052: {
1.32 markus 1053: char string[1024];
1.31 markus 1054: pid_t pid;
1055: int bytes = 0;
1.42 markus 1056: u_int i;
1057: u_char ch;
1.31 markus 1058: char *s;
1059:
1.139 djm 1060: if (len <= 0)
1061: return (0);
1062:
1063: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1064: /* Get one character at a time. */
1065: ch = buf[i];
1066:
1067: if (escape_pending) {
1068: /* We have previously seen an escape character. */
1069: /* Clear the flag now. */
1070: escape_pending = 0;
1071:
1072: /* Process the escaped character. */
1073: switch (ch) {
1074: case '.':
1075: /* Terminate the connection. */
1.32 markus 1076: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1077: buffer_append(berr, string, strlen(string));
1.31 markus 1078:
1079: quit_pending = 1;
1080: return -1;
1081:
1082: case 'Z' - 64:
1083: /* Suspend the program. */
1084: /* Print a message to that effect to the user. */
1.32 markus 1085: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1086: buffer_append(berr, string, strlen(string));
1.31 markus 1087:
1088: /* Restore terminal modes and suspend. */
1089: client_suspend_self(bin, bout, berr);
1090:
1091: /* We have been continued. */
1092: continue;
1093:
1.111 markus 1094: case 'B':
1095: if (compat20) {
1096: snprintf(string, sizeof string,
1097: "%cB\r\n", escape_char);
1098: buffer_append(berr, string,
1099: strlen(string));
1100: channel_request_start(session_ident,
1101: "break", 0);
1102: packet_put_int(1000);
1103: packet_send();
1104: }
1105: continue;
1106:
1.54 markus 1107: case 'R':
1.59 markus 1108: if (compat20) {
1109: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1110: logit("Server does not support re-keying");
1.59 markus 1111: else
1112: need_rekeying = 1;
1113: }
1.54 markus 1114: continue;
1115:
1.31 markus 1116: case '&':
1117: /*
1118: * Detach the program (continue to serve connections,
1119: * but put in background and no more new connections).
1120: */
1121: /* Restore tty modes. */
1122: leave_raw_mode();
1123:
1124: /* Stop listening for new connections. */
1.86 markus 1125: channel_stop_listening();
1.31 markus 1126:
1.86 markus 1127: snprintf(string, sizeof string,
1128: "%c& [backgrounded]\n", escape_char);
1129: buffer_append(berr, string, strlen(string));
1.31 markus 1130:
1131: /* Fork into background. */
1132: pid = fork();
1133: if (pid < 0) {
1134: error("fork: %.100s", strerror(errno));
1135: continue;
1136: }
1137: if (pid != 0) { /* This is the parent. */
1138: /* The parent just exits. */
1139: exit(0);
1140: }
1141: /* The child continues serving connections. */
1.86 markus 1142: if (compat20) {
1143: buffer_append(bin, "\004", 1);
1144: /* fake EOF on stdin */
1145: return -1;
1146: } else if (!stdin_eof) {
1147: /*
1148: * Sending SSH_CMSG_EOF alone does not always appear
1149: * to be enough. So we try to send an EOF character
1150: * first.
1151: */
1152: packet_start(SSH_CMSG_STDIN_DATA);
1153: packet_put_string("\004", 1);
1154: packet_send();
1155: /* Close stdin. */
1156: stdin_eof = 1;
1157: if (buffer_len(bin) == 0) {
1158: packet_start(SSH_CMSG_EOF);
1159: packet_send();
1160: }
1161: }
1162: continue;
1.31 markus 1163:
1164: case '?':
1.32 markus 1165: snprintf(string, sizeof string,
1.31 markus 1166: "%c?\r\n\
1167: Supported escape sequences:\r\n\
1.104 stevesk 1168: %c. - terminate connection\r\n\
1.111 markus 1169: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1170: %cC - open a command line\r\n\
1171: %cR - Request rekey (SSH protocol 2 only)\r\n\
1172: %c^Z - suspend ssh\r\n\
1173: %c# - list forwarded connections\r\n\
1174: %c& - background ssh (when waiting for connections to terminate)\r\n\
1175: %c? - this message\r\n\
1176: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1177: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1178: escape_char, escape_char, escape_char, escape_char,
1179: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1180: escape_char, escape_char, escape_char);
1.32 markus 1181: buffer_append(berr, string, strlen(string));
1.31 markus 1182: continue;
1183:
1184: case '#':
1.32 markus 1185: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1186: buffer_append(berr, string, strlen(string));
1.31 markus 1187: s = channel_open_message();
1188: buffer_append(berr, s, strlen(s));
1189: xfree(s);
1.97 jakob 1190: continue;
1191:
1192: case 'C':
1.99 markus 1193: process_cmdline();
1.31 markus 1194: continue;
1195:
1196: default:
1197: if (ch != escape_char) {
1198: buffer_put_char(bin, escape_char);
1199: bytes++;
1200: }
1201: /* Escaped characters fall through here */
1202: break;
1203: }
1204: } else {
1205: /*
1206: * The previous character was not an escape char. Check if this
1207: * is an escape.
1208: */
1209: if (last_was_cr && ch == escape_char) {
1210: /* It is. Set the flag and continue to next character. */
1211: escape_pending = 1;
1212: continue;
1213: }
1214: }
1215:
1216: /*
1217: * Normal character. Record whether it was a newline,
1218: * and append it to the buffer.
1219: */
1220: last_was_cr = (ch == '\r' || ch == '\n');
1221: buffer_put_char(bin, ch);
1222: bytes++;
1223: }
1224: return bytes;
1225: }
1226:
1.77 itojun 1227: static void
1.161 deraadt 1228: client_process_input(fd_set *readset)
1.17 markus 1229: {
1.21 deraadt 1230: int len;
1.31 markus 1231: char buf[8192];
1.16 markus 1232:
1.11 markus 1233: /* Read input from stdin. */
1234: if (FD_ISSET(fileno(stdin), readset)) {
1235: /* Read as much as possible. */
1236: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1237: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1238: return; /* we'll try again later */
1.11 markus 1239: if (len <= 0) {
1.13 markus 1240: /*
1241: * Received EOF or error. They are treated
1242: * similarly, except that an error message is printed
1243: * if it was an error condition.
1244: */
1.11 markus 1245: if (len < 0) {
1246: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1247: buffer_append(&stderr_buffer, buf, strlen(buf));
1248: }
1249: /* Mark that we have seen EOF. */
1250: stdin_eof = 1;
1.13 markus 1251: /*
1252: * Send an EOF message to the server unless there is
1253: * data in the buffer. If there is data in the
1254: * buffer, no message will be sent now. Code
1255: * elsewhere will send the EOF when the buffer
1256: * becomes empty if stdin_eof is set.
1257: */
1.11 markus 1258: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1259: packet_start(SSH_CMSG_EOF);
1260: packet_send();
1.11 markus 1261: }
1.72 stevesk 1262: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1263: /*
1264: * Normal successful read, and no escape character.
1265: * Just append the data to buffer.
1266: */
1.11 markus 1267: buffer_append(&stdin_buffer, buf, len);
1268: } else {
1.13 markus 1269: /*
1270: * Normal, successful read. But we have an escape character
1271: * and have to process the characters one by one.
1272: */
1.52 markus 1273: if (process_escapes(&stdin_buffer, &stdout_buffer,
1274: &stderr_buffer, buf, len) == -1)
1.31 markus 1275: return;
1.11 markus 1276: }
1277: }
1278: }
1279:
1.77 itojun 1280: static void
1.161 deraadt 1281: client_process_output(fd_set *writeset)
1.11 markus 1282: {
1283: int len;
1284: char buf[100];
1.1 deraadt 1285:
1.11 markus 1286: /* Write buffered output to stdout. */
1287: if (FD_ISSET(fileno(stdout), writeset)) {
1288: /* Write as much data as possible. */
1289: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1290: buffer_len(&stdout_buffer));
1.11 markus 1291: if (len <= 0) {
1.64 markus 1292: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1293: len = 0;
1294: else {
1.13 markus 1295: /*
1296: * An error or EOF was encountered. Put an
1297: * error message to stderr buffer.
1298: */
1.11 markus 1299: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1300: buffer_append(&stderr_buffer, buf, strlen(buf));
1301: quit_pending = 1;
1302: return;
1303: }
1304: }
1305: /* Consume printed data from the buffer. */
1306: buffer_consume(&stdout_buffer, len);
1.57 markus 1307: stdout_bytes += len;
1.11 markus 1308: }
1309: /* Write buffered output to stderr. */
1310: if (FD_ISSET(fileno(stderr), writeset)) {
1311: /* Write as much data as possible. */
1312: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1313: buffer_len(&stderr_buffer));
1.11 markus 1314: if (len <= 0) {
1.64 markus 1315: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1316: len = 0;
1317: else {
1.13 markus 1318: /* EOF or error, but can't even print error message. */
1.11 markus 1319: quit_pending = 1;
1320: return;
1321: }
1322: }
1323: /* Consume printed characters from the buffer. */
1324: buffer_consume(&stderr_buffer, len);
1.57 markus 1325: stderr_bytes += len;
1.11 markus 1326: }
1.1 deraadt 1327: }
1328:
1.13 markus 1329: /*
1.15 markus 1330: * Get packets from the connection input buffer, and process them as long as
1331: * there are packets available.
1332: *
1333: * Any unknown packets received during the actual
1334: * session cause the session to terminate. This is
1335: * intended to make debugging easier since no
1336: * confirmations are sent. Any compatible protocol
1337: * extensions must be negotiated during the
1338: * preparatory phase.
1339: */
1340:
1.77 itojun 1341: static void
1.49 itojun 1342: client_process_buffered_input_packets(void)
1.15 markus 1343: {
1.54 markus 1344: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1345: }
1346:
1.31 markus 1347: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1348:
1.77 itojun 1349: static int
1.31 markus 1350: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1351: {
1.31 markus 1352: /* XXX we assume c->extended is writeable */
1353: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1354: }
1355:
1.77 itojun 1356: static void
1.60 markus 1357: client_channel_closed(int id, void *arg)
1358: {
1.83 markus 1359: channel_cancel_cleanup(id);
1.60 markus 1360: session_closed = 1;
1.113 markus 1361: leave_raw_mode();
1.60 markus 1362: }
1363:
1.15 markus 1364: /*
1.13 markus 1365: * Implements the interactive session with the server. This is called after
1366: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1367: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1368: * used as an escape character for terminating or suspending the session.
1.13 markus 1369: */
1.1 deraadt 1370:
1.20 markus 1371: int
1.30 markus 1372: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1373: {
1.46 markus 1374: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1375: double start_time, total_time;
1.130 avsm 1376: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1377: u_int nalloc = 0;
1.11 markus 1378: char buf[100];
1379:
1380: debug("Entering interactive session.");
1381:
1382: start_time = get_current_time();
1383:
1384: /* Initialize variables. */
1385: escape_pending = 0;
1386: last_was_cr = 1;
1387: exit_status = -1;
1388: stdin_eof = 0;
1389: buffer_high = 64 * 1024;
1390: connection_in = packet_get_connection_in();
1391: connection_out = packet_get_connection_out();
1.46 markus 1392: max_fd = MAX(connection_in, connection_out);
1.123 djm 1393: if (control_fd != -1)
1394: max_fd = MAX(max_fd, control_fd);
1.46 markus 1395:
1396: if (!compat20) {
1.63 markus 1397: /* enable nonblocking unless tty */
1398: if (!isatty(fileno(stdin)))
1399: set_nonblock(fileno(stdin));
1400: if (!isatty(fileno(stdout)))
1401: set_nonblock(fileno(stdout));
1402: if (!isatty(fileno(stderr)))
1403: set_nonblock(fileno(stderr));
1.46 markus 1404: max_fd = MAX(max_fd, fileno(stdin));
1405: max_fd = MAX(max_fd, fileno(stdout));
1406: max_fd = MAX(max_fd, fileno(stderr));
1407: }
1.11 markus 1408: stdin_bytes = 0;
1409: stdout_bytes = 0;
1410: stderr_bytes = 0;
1411: quit_pending = 0;
1412: escape_char = escape_char_arg;
1413:
1414: /* Initialize buffers. */
1415: buffer_init(&stdin_buffer);
1416: buffer_init(&stdout_buffer);
1417: buffer_init(&stderr_buffer);
1418:
1.15 markus 1419: client_init_dispatch();
1420:
1.105 markus 1421: /*
1422: * Set signal handlers, (e.g. to restore non-blocking mode)
1423: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1424: */
1.131 djm 1425: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1426: signal(SIGHUP, signal_handler);
1.105 markus 1427: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1428: signal(SIGINT, signal_handler);
1429: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1430: signal(SIGQUIT, signal_handler);
1431: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1432: signal(SIGTERM, signal_handler);
1.132 djm 1433: signal(SIGWINCH, window_change_handler);
1.11 markus 1434:
1435: if (have_pty)
1436: enter_raw_mode();
1437:
1.48 markus 1438: if (compat20) {
1439: session_ident = ssh2_chan_id;
1.72 stevesk 1440: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1441: channel_register_filter(session_ident,
1.149 reyk 1442: simple_escape_filter, NULL);
1.60 markus 1443: if (session_ident != -1)
1444: channel_register_cleanup(session_ident,
1.143 djm 1445: client_channel_closed, 0);
1.48 markus 1446: } else {
1447: /* Check if we should immediately send eof on stdin. */
1.16 markus 1448: client_check_initial_eof_on_stdin();
1.48 markus 1449: }
1.30 markus 1450:
1.11 markus 1451: /* Main loop of the client for the interactive session mode. */
1452: while (!quit_pending) {
1453:
1.13 markus 1454: /* Process buffered packets sent by the server. */
1.11 markus 1455: client_process_buffered_input_packets();
1456:
1.60 markus 1457: if (compat20 && session_closed && !channel_still_open())
1458: break;
1459:
1.56 markus 1460: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1461:
1.56 markus 1462: if (rekeying) {
1463: debug("rekeying in progress");
1464: } else {
1465: /*
1466: * Make packets of buffered stdin data, and buffer
1467: * them for sending to the server.
1468: */
1469: if (!compat20)
1470: client_make_packets_from_stdin_data();
1.11 markus 1471:
1.56 markus 1472: /*
1473: * Make packets from buffered channel data, and
1474: * enqueue them for sending to the server.
1475: */
1476: if (packet_not_very_much_data_to_write())
1477: channel_output_poll();
1.11 markus 1478:
1.56 markus 1479: /*
1480: * Check if the window size has changed, and buffer a
1481: * message about it to the server if so.
1482: */
1483: client_check_window_change();
1.11 markus 1484:
1.56 markus 1485: if (quit_pending)
1486: break;
1487: }
1.13 markus 1488: /*
1489: * Wait until we have something to do (something becomes
1490: * available on one of the descriptors).
1491: */
1.81 markus 1492: max_fd2 = max_fd;
1.56 markus 1493: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1494: &max_fd2, &nalloc, rekeying);
1.11 markus 1495:
1496: if (quit_pending)
1497: break;
1498:
1.56 markus 1499: /* Do channel operations unless rekeying in progress. */
1500: if (!rekeying) {
1501: channel_after_select(readset, writeset);
1.108 markus 1502: if (need_rekeying || packet_need_rekeying()) {
1503: debug("need rekeying");
1.56 markus 1504: xxx_kex->done = 0;
1505: kex_send_kexinit(xxx_kex);
1506: need_rekeying = 0;
1507: }
1508: }
1.11 markus 1509:
1.17 markus 1510: /* Buffer input from the connection. */
1.46 markus 1511: client_process_net_input(readset);
1.17 markus 1512:
1.123 djm 1513: /* Accept control connections. */
1514: client_process_control(readset);
1515:
1.17 markus 1516: if (quit_pending)
1517: break;
1.11 markus 1518:
1.17 markus 1519: if (!compat20) {
1520: /* Buffer data from stdin */
1.46 markus 1521: client_process_input(readset);
1.17 markus 1522: /*
1523: * Process output to stdout and stderr. Output to
1524: * the connection is processed elsewhere (above).
1525: */
1.46 markus 1526: client_process_output(writeset);
1.17 markus 1527: }
1.11 markus 1528:
1.13 markus 1529: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1530: if (FD_ISSET(connection_out, writeset))
1.11 markus 1531: packet_write_poll();
1532: }
1.46 markus 1533: if (readset)
1534: xfree(readset);
1535: if (writeset)
1536: xfree(writeset);
1.11 markus 1537:
1538: /* Terminate the session. */
1539:
1540: /* Stop watching for window change. */
1.132 djm 1541: signal(SIGWINCH, SIG_DFL);
1.11 markus 1542:
1.76 markus 1543: channel_free_all();
1.11 markus 1544:
1.75 markus 1545: if (have_pty)
1546: leave_raw_mode();
1547:
1548: /* restore blocking io */
1549: if (!isatty(fileno(stdin)))
1550: unset_nonblock(fileno(stdin));
1551: if (!isatty(fileno(stdout)))
1552: unset_nonblock(fileno(stdout));
1553: if (!isatty(fileno(stderr)))
1554: unset_nonblock(fileno(stderr));
1.116 dtucker 1555:
1556: /*
1557: * If there was no shell or command requested, there will be no remote
1558: * exit status to be returned. In that case, clear error code if the
1559: * connection was deliberately terminated at this end.
1560: */
1561: if (no_shell_flag && received_signal == SIGTERM) {
1562: received_signal = 0;
1563: exit_status = 0;
1564: }
1.75 markus 1565:
1.113 markus 1566: if (received_signal)
1.89 itojun 1567: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1568:
1.13 markus 1569: /*
1570: * In interactive mode (with pseudo tty) display a message indicating
1571: * that the connection has been closed.
1572: */
1.11 markus 1573: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1574: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1575: buffer_append(&stderr_buffer, buf, strlen(buf));
1576: }
1.70 markus 1577:
1.11 markus 1578: /* Output any buffered data for stdout. */
1.70 markus 1579: while (buffer_len(&stdout_buffer) > 0) {
1580: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1581: buffer_len(&stdout_buffer));
1.70 markus 1582: if (len <= 0) {
1.11 markus 1583: error("Write failed flushing stdout buffer.");
1.70 markus 1584: break;
1585: }
1.11 markus 1586: buffer_consume(&stdout_buffer, len);
1.57 markus 1587: stdout_bytes += len;
1.11 markus 1588: }
1589:
1590: /* Output any buffered data for stderr. */
1.70 markus 1591: while (buffer_len(&stderr_buffer) > 0) {
1592: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1593: buffer_len(&stderr_buffer));
1.70 markus 1594: if (len <= 0) {
1.11 markus 1595: error("Write failed flushing stderr buffer.");
1.70 markus 1596: break;
1597: }
1.11 markus 1598: buffer_consume(&stderr_buffer, len);
1.57 markus 1599: stderr_bytes += len;
1.11 markus 1600: }
1601:
1602: /* Clear and free any buffers. */
1603: memset(buf, 0, sizeof(buf));
1604: buffer_free(&stdin_buffer);
1605: buffer_free(&stdout_buffer);
1606: buffer_free(&stderr_buffer);
1607:
1608: /* Report bytes transferred, and transfer rates. */
1609: total_time = get_current_time() - start_time;
1610: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1611: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1612: if (total_time > 0)
1613: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1614: stdin_bytes / total_time, stdout_bytes / total_time,
1615: stderr_bytes / total_time);
1.11 markus 1616:
1617: /* Return the exit status of the program. */
1618: debug("Exit status %d", exit_status);
1619: return exit_status;
1.15 markus 1620: }
1621:
1622: /*********/
1623:
1.77 itojun 1624: static void
1.94 markus 1625: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1626: {
1.42 markus 1627: u_int data_len;
1.15 markus 1628: char *data = packet_get_string(&data_len);
1.93 markus 1629: packet_check_eom();
1.15 markus 1630: buffer_append(&stdout_buffer, data, data_len);
1631: memset(data, 0, data_len);
1632: xfree(data);
1633: }
1.77 itojun 1634: static void
1.94 markus 1635: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1636: {
1.42 markus 1637: u_int data_len;
1.15 markus 1638: char *data = packet_get_string(&data_len);
1.93 markus 1639: packet_check_eom();
1.15 markus 1640: buffer_append(&stderr_buffer, data, data_len);
1641: memset(data, 0, data_len);
1642: xfree(data);
1643: }
1.77 itojun 1644: static void
1.94 markus 1645: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1646: {
1647: exit_status = packet_get_int();
1.93 markus 1648: packet_check_eom();
1.15 markus 1649: /* Acknowledge the exit. */
1650: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1651: packet_send();
1652: /*
1653: * Must wait for packet to be sent since we are
1654: * exiting the loop.
1655: */
1656: packet_write_wait();
1657: /* Flag that we want to exit. */
1658: quit_pending = 1;
1659: }
1.115 markus 1660: static void
1661: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1662: {
1663: Channel *c = NULL;
1664: int remote_id, sock;
1665:
1666: /* Read the remote channel number from the message. */
1667: remote_id = packet_get_int();
1668: packet_check_eom();
1669:
1670: /*
1671: * Get a connection to the local authentication agent (this may again
1672: * get forwarded).
1673: */
1674: sock = ssh_get_authentication_socket();
1675:
1676: /*
1677: * If we could not connect the agent, send an error message back to
1678: * the server. This should never happen unless the agent dies,
1679: * because authentication forwarding is only enabled if we have an
1680: * agent.
1681: */
1682: if (sock >= 0) {
1683: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1684: -1, 0, 0, 0, "authentication agent connection", 1);
1685: c->remote_id = remote_id;
1686: c->force_drain = 1;
1687: }
1688: if (c == NULL) {
1689: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1690: packet_put_int(remote_id);
1691: } else {
1692: /* Send a confirmation to the remote host. */
1693: debug("Forwarding authentication connection.");
1694: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1695: packet_put_int(remote_id);
1696: packet_put_int(c->self);
1697: }
1698: packet_send();
1699: }
1.15 markus 1700:
1.77 itojun 1701: static Channel *
1.40 markus 1702: client_request_forwarded_tcpip(const char *request_type, int rchan)
1703: {
1.103 deraadt 1704: Channel *c = NULL;
1.40 markus 1705: char *listen_address, *originator_address;
1706: int listen_port, originator_port;
1.67 markus 1707: int sock;
1.40 markus 1708:
1709: /* Get rest of the packet */
1710: listen_address = packet_get_string(NULL);
1711: listen_port = packet_get_int();
1712: originator_address = packet_get_string(NULL);
1713: originator_port = packet_get_int();
1.93 markus 1714: packet_check_eom();
1.40 markus 1715:
1716: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1717: listen_address, listen_port, originator_address, originator_port);
1718:
1.80 stevesk 1719: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1720: if (sock < 0) {
1721: xfree(originator_address);
1722: xfree(listen_address);
1723: return NULL;
1724: }
1725: c = channel_new("forwarded-tcpip",
1726: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1727: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1728: originator_address, 1);
1.40 markus 1729: xfree(originator_address);
1730: xfree(listen_address);
1731: return c;
1732: }
1733:
1.103 deraadt 1734: static Channel *
1.40 markus 1735: client_request_x11(const char *request_type, int rchan)
1736: {
1737: Channel *c = NULL;
1738: char *originator;
1739: int originator_port;
1.67 markus 1740: int sock;
1.40 markus 1741:
1742: if (!options.forward_x11) {
1743: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1744: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1745: return NULL;
1746: }
1747: originator = packet_get_string(NULL);
1748: if (datafellows & SSH_BUG_X11FWD) {
1749: debug2("buggy server: x11 request w/o originator_port");
1750: originator_port = 0;
1751: } else {
1752: originator_port = packet_get_int();
1753: }
1.93 markus 1754: packet_check_eom();
1.40 markus 1755: /* XXX check permission */
1.47 markus 1756: debug("client_request_x11: request from %s %d", originator,
1757: originator_port);
1.67 markus 1758: xfree(originator);
1.40 markus 1759: sock = x11_connect_display();
1.67 markus 1760: if (sock < 0)
1761: return NULL;
1762: c = channel_new("x11",
1763: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1764: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1765: c->force_drain = 1;
1.40 markus 1766: return c;
1767: }
1768:
1.103 deraadt 1769: static Channel *
1.40 markus 1770: client_request_agent(const char *request_type, int rchan)
1771: {
1772: Channel *c = NULL;
1.67 markus 1773: int sock;
1.40 markus 1774:
1775: if (!options.forward_agent) {
1776: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1777: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1778: return NULL;
1779: }
1.177 stevesk 1780: sock = ssh_get_authentication_socket();
1.67 markus 1781: if (sock < 0)
1782: return NULL;
1783: c = channel_new("authentication agent connection",
1784: SSH_CHANNEL_OPEN, sock, sock, -1,
1785: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1786: "authentication agent connection", 1);
1.82 markus 1787: c->force_drain = 1;
1.40 markus 1788: return c;
1.180 djm 1789: }
1790:
1791: int
1792: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1793: {
1794: Channel *c;
1795: int fd;
1796:
1797: if (tun_mode == SSH_TUNMODE_NO)
1798: return 0;
1799:
1800: if (!compat20) {
1801: error("Tunnel forwarding is not support for protocol 1");
1802: return -1;
1803: }
1804:
1805: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1806:
1807: /* Open local tunnel device */
1808: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1809: error("Tunnel device open failed.");
1810: return -1;
1811: }
1812:
1813: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1814: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1815: c->datagram = 1;
1816:
1817: packet_start(SSH2_MSG_CHANNEL_OPEN);
1818: packet_put_cstring("tun@openssh.com");
1819: packet_put_int(c->self);
1820: packet_put_int(c->local_window_max);
1821: packet_put_int(c->local_maxpacket);
1822: packet_put_int(tun_mode);
1823: packet_put_int(remote_tun);
1824: packet_send();
1825:
1826: return 0;
1.40 markus 1827: }
1828:
1.22 markus 1829: /* XXXX move to generic input handler */
1.77 itojun 1830: static void
1.94 markus 1831: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1832: {
1833: Channel *c = NULL;
1834: char *ctype;
1835: int rchan;
1.102 markus 1836: u_int rmaxpack, rwindow, len;
1.22 markus 1837:
1838: ctype = packet_get_string(&len);
1839: rchan = packet_get_int();
1840: rwindow = packet_get_int();
1841: rmaxpack = packet_get_int();
1842:
1.24 markus 1843: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1844: ctype, rchan, rwindow, rmaxpack);
1845:
1.40 markus 1846: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1847: c = client_request_forwarded_tcpip(ctype, rchan);
1848: } else if (strcmp(ctype, "x11") == 0) {
1849: c = client_request_x11(ctype, rchan);
1850: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1851: c = client_request_agent(ctype, rchan);
1.22 markus 1852: }
1853: /* XXX duplicate : */
1854: if (c != NULL) {
1855: debug("confirm %s", ctype);
1856: c->remote_id = rchan;
1857: c->remote_window = rwindow;
1858: c->remote_maxpacket = rmaxpack;
1.69 markus 1859: if (c->type != SSH_CHANNEL_CONNECTING) {
1860: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1861: packet_put_int(c->remote_id);
1862: packet_put_int(c->self);
1863: packet_put_int(c->local_window);
1864: packet_put_int(c->local_maxpacket);
1865: packet_send();
1866: }
1.22 markus 1867: } else {
1868: debug("failure %s", ctype);
1869: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1870: packet_put_int(rchan);
1871: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1872: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1873: packet_put_cstring("open failed");
1.66 markus 1874: packet_put_cstring("");
1875: }
1.22 markus 1876: packet_send();
1877: }
1878: xfree(ctype);
1879: }
1.77 itojun 1880: static void
1.94 markus 1881: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1882: {
1883: Channel *c = NULL;
1.123 djm 1884: int exitval, id, reply, success = 0;
1.48 markus 1885: char *rtype;
1886:
1887: id = packet_get_int();
1888: rtype = packet_get_string(NULL);
1889: reply = packet_get_char();
1890:
1891: debug("client_input_channel_req: channel %d rtype %s reply %d",
1892: id, rtype, reply);
1893:
1.128 djm 1894: if (id == -1) {
1895: error("client_input_channel_req: request for channel -1");
1896: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1897: error("client_input_channel_req: channel %d: unknown channel", id);
1898: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1899: exitval = packet_get_int();
1900: if (id == session_ident) {
1901: success = 1;
1902: exit_status = exitval;
1903: } else if (c->ctl_fd == -1) {
1904: error("client_input_channel_req: unexpected channel %d",
1905: session_ident);
1906: } else {
1907: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1908: success = 1;
1909: }
1.93 markus 1910: packet_check_eom();
1.48 markus 1911: }
1912: if (reply) {
1913: packet_start(success ?
1914: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1915: packet_put_int(id);
1.48 markus 1916: packet_send();
1917: }
1918: xfree(rtype);
1919: }
1.95 markus 1920: static void
1921: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1922: {
1923: char *rtype;
1924: int want_reply;
1925: int success = 0;
1926:
1927: rtype = packet_get_string(NULL);
1928: want_reply = packet_get_char();
1.117 markus 1929: debug("client_input_global_request: rtype %s want_reply %d",
1930: rtype, want_reply);
1.95 markus 1931: if (want_reply) {
1932: packet_start(success ?
1933: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1934: packet_send();
1935: packet_write_wait();
1936: }
1937: xfree(rtype);
1938: }
1.22 markus 1939:
1.123 djm 1940: void
1.129 deraadt 1941: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1942: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1943: dispatch_fn *subsys_repl)
1944: {
1945: int len;
1.132 djm 1946: Channel *c = NULL;
1.123 djm 1947:
1948: debug2("%s: id %d", __func__, id);
1949:
1.132 djm 1950: if ((c = channel_lookup(id)) == NULL)
1951: fatal("client_session2_setup: channel %d: unknown channel", id);
1952:
1.123 djm 1953: if (want_tty) {
1954: struct winsize ws;
1955: struct termios tio;
1956:
1957: /* Store window size in the packet. */
1958: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1959: memset(&ws, 0, sizeof(ws));
1960:
1961: channel_request_start(id, "pty-req", 0);
1962: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1963: packet_put_int((u_int)ws.ws_col);
1964: packet_put_int((u_int)ws.ws_row);
1965: packet_put_int((u_int)ws.ws_xpixel);
1966: packet_put_int((u_int)ws.ws_ypixel);
1.123 djm 1967: tio = get_saved_tio();
1968: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1969: packet_send();
1970: /* XXX wait for reply */
1.132 djm 1971: c->client_tty = 1;
1.123 djm 1972: }
1973:
1974: /* Transfer any environment variables from client to server */
1.126 djm 1975: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1976: int i, j, matched;
1977: char *name, *val;
1978:
1979: debug("Sending environment.");
1.126 djm 1980: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1981: /* Split */
1.126 djm 1982: name = xstrdup(env[i]);
1.123 djm 1983: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1984: xfree(name);
1.123 djm 1985: continue;
1986: }
1987: *val++ = '\0';
1988:
1989: matched = 0;
1990: for (j = 0; j < options.num_send_env; j++) {
1991: if (match_pattern(name, options.send_env[j])) {
1992: matched = 1;
1993: break;
1994: }
1995: }
1996: if (!matched) {
1997: debug3("Ignored env %s", name);
1.144 stevesk 1998: xfree(name);
1.123 djm 1999: continue;
2000: }
2001:
2002: debug("Sending env %s = %s", name, val);
2003: channel_request_start(id, "env", 0);
2004: packet_put_cstring(name);
2005: packet_put_cstring(val);
2006: packet_send();
1.144 stevesk 2007: xfree(name);
1.123 djm 2008: }
2009: }
2010:
2011: len = buffer_len(cmd);
2012: if (len > 0) {
2013: if (len > 900)
2014: len = 900;
2015: if (want_subsystem) {
2016: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
2017: channel_request_start(id, "subsystem", subsys_repl != NULL);
2018: if (subsys_repl != NULL) {
2019: /* register callback for reply */
2020: /* XXX we assume that client_loop has already been called */
2021: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
2022: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
2023: }
2024: } else {
2025: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
2026: channel_request_start(id, "exec", 0);
2027: }
2028: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2029: packet_send();
2030: } else {
2031: channel_request_start(id, "shell", 0);
2032: packet_send();
2033: }
2034: }
2035:
1.77 itojun 2036: static void
1.49 itojun 2037: client_init_dispatch_20(void)
1.16 markus 2038: {
1.55 markus 2039: dispatch_init(&dispatch_protocol_error);
1.100 markus 2040:
1.16 markus 2041: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2042: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2043: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2044: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2045: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2046: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2047: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2048: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2049: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 2050: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2051:
2052: /* rekeying */
2053: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2054:
2055: /* global request reply messages */
2056: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2057: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 2058: }
1.77 itojun 2059: static void
1.49 itojun 2060: client_init_dispatch_13(void)
1.15 markus 2061: {
2062: dispatch_init(NULL);
2063: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2064: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2065: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2066: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2067: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2068: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2069: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2070: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2071: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2072:
2073: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2074: &client_input_agent_open : &deny_input_open);
1.39 markus 2075: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2076: &x11_input_open : &deny_input_open);
1.15 markus 2077: }
1.77 itojun 2078: static void
1.49 itojun 2079: client_init_dispatch_15(void)
1.15 markus 2080: {
2081: client_init_dispatch_13();
2082: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2083: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2084: }
1.79 stevesk 2085: static void
1.49 itojun 2086: client_init_dispatch(void)
1.15 markus 2087: {
1.16 markus 2088: if (compat20)
2089: client_init_dispatch_20();
2090: else if (compat13)
1.15 markus 2091: client_init_dispatch_13();
2092: else
2093: client_init_dispatch_15();
1.113 markus 2094: }
2095:
2096: /* client specific fatal cleanup */
2097: void
1.114 markus 2098: cleanup_exit(int i)
1.113 markus 2099: {
2100: leave_raw_mode();
2101: leave_non_blocking();
1.123 djm 2102: if (options.control_path != NULL && control_fd != -1)
2103: unlink(options.control_path);
1.114 markus 2104: _exit(i);
1.1 deraadt 2105: }
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