Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.188
1.188 ! dtucker 1: /* $OpenBSD: clientloop.c,v 1.187 2008/01/23 01:56:54 dtucker 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. */
1.1 deraadt 152:
1.77 itojun 153: static void client_init_dispatch(void);
1.16 markus 154: int session_ident = -1;
155:
1.123 djm 156: struct confirm_ctx {
157: int want_tty;
158: int want_subsys;
1.140 djm 159: int want_x_fwd;
160: int want_agent_fwd;
1.123 djm 161: Buffer cmd;
162: char *term;
163: struct termios tio;
1.126 djm 164: char **env;
1.123 djm 165: };
166:
1.54 markus 167: /*XXX*/
168: extern Kex *xxx_kex;
169:
1.123 djm 170: void ssh_process_session2_setup(int, int, int, Buffer *);
171:
1.1 deraadt 172: /* Restores stdin to blocking mode. */
173:
1.77 itojun 174: static void
1.49 itojun 175: leave_non_blocking(void)
1.1 deraadt 176: {
1.11 markus 177: if (in_non_blocking_mode) {
1.125 djm 178: unset_nonblock(fileno(stdin));
1.11 markus 179: in_non_blocking_mode = 0;
180: }
1.1 deraadt 181: }
182:
1.11 markus 183: /* Puts stdin terminal in non-blocking mode. */
184:
1.77 itojun 185: static void
1.49 itojun 186: enter_non_blocking(void)
1.1 deraadt 187: {
1.11 markus 188: in_non_blocking_mode = 1;
1.124 djm 189: set_nonblock(fileno(stdin));
1.1 deraadt 190: }
191:
1.13 markus 192: /*
193: * Signal handler for the window change signal (SIGWINCH). This just sets a
194: * flag indicating that the window has changed.
195: */
1.157 deraadt 196: /*ARGSUSED */
1.77 itojun 197: static void
1.11 markus 198: window_change_handler(int sig)
1.1 deraadt 199: {
1.11 markus 200: received_window_change_signal = 1;
201: signal(SIGWINCH, window_change_handler);
1.1 deraadt 202: }
203:
1.13 markus 204: /*
205: * Signal handler for signals that cause the program to terminate. These
206: * signals must be trapped to restore terminal modes.
207: */
1.157 deraadt 208: /*ARGSUSED */
1.77 itojun 209: static void
1.11 markus 210: signal_handler(int sig)
1.1 deraadt 211: {
1.75 markus 212: received_signal = sig;
213: quit_pending = 1;
1.1 deraadt 214: }
215:
1.13 markus 216: /*
217: * Returns current time in seconds from Jan 1, 1970 with the maximum
218: * available resolution.
219: */
1.1 deraadt 220:
1.77 itojun 221: static double
1.49 itojun 222: get_current_time(void)
1.1 deraadt 223: {
1.11 markus 224: struct timeval tv;
225: gettimeofday(&tv, NULL);
226: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 227: }
228:
229: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
230: void
231: client_x11_get_proto(const char *display, const char *xauth_path,
232: u_int trusted, char **_proto, char **_data)
233: {
234: char cmd[1024];
235: char line[512];
236: char xdisplay[512];
237: static char proto[512], data[512];
238: FILE *f;
239: int got_data = 0, generated = 0, do_unlink = 0, i;
240: char *xauthdir, *xauthfile;
241: struct stat st;
242:
243: xauthdir = xauthfile = NULL;
244: *_proto = proto;
245: *_data = data;
246: proto[0] = data[0] = '\0';
247:
248: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
249: debug("No xauth program.");
250: } else {
251: if (display == NULL) {
252: debug("x11_get_proto: DISPLAY not set");
253: return;
254: }
255: /*
256: * Handle FamilyLocal case where $DISPLAY does
257: * not match an authorization entry. For this we
258: * just try "xauth list unix:displaynum.screennum".
259: * XXX: "localhost" match to determine FamilyLocal
260: * is not perfect.
261: */
262: if (strncmp(display, "localhost:", 10) == 0) {
263: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
264: display + 10);
265: display = xdisplay;
266: }
267: if (trusted == 0) {
268: xauthdir = xmalloc(MAXPATHLEN);
269: xauthfile = xmalloc(MAXPATHLEN);
270: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
271: if (mkdtemp(xauthdir) != NULL) {
272: do_unlink = 1;
273: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
274: xauthdir);
275: snprintf(cmd, sizeof(cmd),
276: "%s -f %s generate %s " SSH_X11_PROTO
277: " untrusted timeout 1200 2>" _PATH_DEVNULL,
278: xauth_path, xauthfile, display);
279: debug2("x11_get_proto: %s", cmd);
280: if (system(cmd) == 0)
281: generated = 1;
282: }
283: }
1.181 markus 284:
285: /*
286: * When in untrusted mode, we read the cookie only if it was
287: * successfully generated as an untrusted one in the step
288: * above.
289: */
290: if (trusted || generated) {
291: snprintf(cmd, sizeof(cmd),
292: "%s %s%s list %s 2>" _PATH_DEVNULL,
293: xauth_path,
294: generated ? "-f " : "" ,
295: generated ? xauthfile : "",
296: display);
297: debug2("x11_get_proto: %s", cmd);
298: f = popen(cmd, "r");
299: if (f && fgets(line, sizeof(line), f) &&
300: sscanf(line, "%*s %511s %511s", proto, data) == 2)
301: got_data = 1;
302: if (f)
303: pclose(f);
304: } else
305: error("Warning: untrusted X11 forwarding setup failed: "
306: "xauth key data not generated");
1.138 djm 307: }
308:
309: if (do_unlink) {
310: unlink(xauthfile);
311: rmdir(xauthdir);
312: }
313: if (xauthdir)
314: xfree(xauthdir);
315: if (xauthfile)
316: xfree(xauthfile);
317:
318: /*
319: * If we didn't get authentication data, just make up some
320: * data. The forwarding code will check the validity of the
321: * response anyway, and substitute this data. The X11
322: * server, however, will ignore this fake data and use
323: * whatever authentication mechanisms it was using otherwise
324: * for the local connection.
325: */
326: if (!got_data) {
327: u_int32_t rnd = 0;
328:
329: logit("Warning: No xauth data; "
330: "using fake authentication data for X11 forwarding.");
331: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
332: for (i = 0; i < 16; i++) {
333: if (i % 4 == 0)
334: rnd = arc4random();
335: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
336: rnd & 0xff);
337: rnd >>= 8;
338: }
339: }
1.1 deraadt 340: }
341:
1.13 markus 342: /*
343: * This is called when the interactive is entered. This checks if there is
344: * an EOF coming on stdin. We must check this explicitly, as select() does
345: * not appear to wake up when redirecting from /dev/null.
346: */
1.1 deraadt 347:
1.77 itojun 348: static void
1.49 itojun 349: client_check_initial_eof_on_stdin(void)
1.1 deraadt 350: {
1.11 markus 351: int len;
352: char buf[1];
1.1 deraadt 353:
1.13 markus 354: /*
355: * If standard input is to be "redirected from /dev/null", we simply
356: * mark that we have seen an EOF and send an EOF message to the
357: * server. Otherwise, we try to read a single character; it appears
358: * that for some files, such /dev/null, select() never wakes up for
359: * read for this descriptor, which means that we never get EOF. This
360: * way we will get the EOF if stdin comes from /dev/null or similar.
361: */
1.11 markus 362: if (stdin_null_flag) {
363: /* Fake EOF on stdin. */
364: debug("Sending eof.");
365: stdin_eof = 1;
366: packet_start(SSH_CMSG_EOF);
367: packet_send();
368: } else {
369: enter_non_blocking();
370:
371: /* Check for immediate EOF on stdin. */
372: len = read(fileno(stdin), buf, 1);
373: if (len == 0) {
1.13 markus 374: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 375: debug("Sending eof.");
376: stdin_eof = 1;
377: packet_start(SSH_CMSG_EOF);
378: packet_send();
379: } else if (len > 0) {
1.13 markus 380: /*
381: * Got data. We must store the data in the buffer,
382: * and also process it as an escape character if
383: * appropriate.
384: */
1.42 markus 385: if ((u_char) buf[0] == escape_char)
1.11 markus 386: escape_pending = 1;
1.52 markus 387: else
1.11 markus 388: buffer_append(&stdin_buffer, buf, 1);
389: }
390: leave_non_blocking();
391: }
1.1 deraadt 392: }
393:
394:
1.13 markus 395: /*
396: * Make packets from buffered stdin data, and buffer them for sending to the
397: * connection.
398: */
1.1 deraadt 399:
1.77 itojun 400: static void
1.49 itojun 401: client_make_packets_from_stdin_data(void)
1.1 deraadt 402: {
1.42 markus 403: u_int len;
1.1 deraadt 404:
1.11 markus 405: /* Send buffered stdin data to the server. */
406: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 407: packet_not_very_much_data_to_write()) {
1.11 markus 408: len = buffer_len(&stdin_buffer);
409: /* Keep the packets at reasonable size. */
410: if (len > packet_get_maxsize())
411: len = packet_get_maxsize();
412: packet_start(SSH_CMSG_STDIN_DATA);
413: packet_put_string(buffer_ptr(&stdin_buffer), len);
414: packet_send();
415: buffer_consume(&stdin_buffer, len);
1.52 markus 416: stdin_bytes += len;
1.11 markus 417: /* If we have a pending EOF, send it now. */
418: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
419: packet_start(SSH_CMSG_EOF);
420: packet_send();
421: }
1.1 deraadt 422: }
423: }
424:
1.13 markus 425: /*
426: * Checks if the client window has changed, and sends a packet about it to
427: * the server if so. The actual change is detected elsewhere (by a software
428: * interrupt on Unix); this just checks the flag and sends a message if
429: * appropriate.
430: */
1.1 deraadt 431:
1.77 itojun 432: static void
1.49 itojun 433: client_check_window_change(void)
1.1 deraadt 434: {
1.16 markus 435: struct winsize ws;
436:
437: if (! received_window_change_signal)
438: return;
439: /** XXX race */
440: received_window_change_signal = 0;
441:
1.37 markus 442: debug2("client_check_window_change: changed");
1.16 markus 443:
444: if (compat20) {
1.123 djm 445: channel_send_window_changes();
1.16 markus 446: } else {
1.123 djm 447: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
448: return;
1.16 markus 449: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 450: packet_put_int((u_int)ws.ws_row);
451: packet_put_int((u_int)ws.ws_col);
452: packet_put_int((u_int)ws.ws_xpixel);
453: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 454: packet_send();
1.1 deraadt 455: }
456: }
457:
1.117 markus 458: static void
459: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
460: {
1.188 ! dtucker 461: keep_alive_timeouts = 0;
1.117 markus 462: client_global_request_reply_fwd(type, seq, ctxt);
463: }
464:
465: static void
466: server_alive_check(void)
467: {
1.188 ! dtucker 468: if (++keep_alive_timeouts > options.server_alive_count_max) {
1.176 markus 469: logit("Timeout, server not responding.");
470: cleanup_exit(255);
471: }
1.117 markus 472: packet_start(SSH2_MSG_GLOBAL_REQUEST);
473: packet_put_cstring("keepalive@openssh.com");
474: packet_put_char(1); /* boolean: want reply */
475: packet_send();
476: }
477:
1.13 markus 478: /*
479: * Waits until the client can do something (some data becomes available on
480: * one of the file descriptors).
481: */
1.77 itojun 482: static void
1.46 markus 483: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 484: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 485: {
1.117 markus 486: struct timeval tv, *tvp;
487: int ret;
488:
1.46 markus 489: /* Add any selections by the channel mechanism. */
1.81 markus 490: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 491:
1.16 markus 492: if (!compat20) {
1.17 markus 493: /* Read from the connection, unless our buffers are full. */
1.16 markus 494: if (buffer_len(&stdout_buffer) < buffer_high &&
495: buffer_len(&stderr_buffer) < buffer_high &&
496: channel_not_very_much_buffered_data())
1.46 markus 497: FD_SET(connection_in, *readsetp);
1.17 markus 498: /*
499: * Read from stdin, unless we have seen EOF or have very much
500: * buffered data to send to the server.
501: */
502: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 503: FD_SET(fileno(stdin), *readsetp);
1.17 markus 504:
505: /* Select stdout/stderr if have data in buffer. */
506: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 507: FD_SET(fileno(stdout), *writesetp);
1.17 markus 508: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 509: FD_SET(fileno(stderr), *writesetp);
1.16 markus 510: } else {
1.71 markus 511: /* channel_prepare_select could have closed the last channel */
1.84 markus 512: if (session_closed && !channel_still_open() &&
513: !packet_have_data_to_write()) {
514: /* clear mask since we did not call select() */
1.87 markus 515: memset(*readsetp, 0, *nallocp);
516: memset(*writesetp, 0, *nallocp);
1.84 markus 517: return;
1.71 markus 518: } else {
519: FD_SET(connection_in, *readsetp);
520: }
1.16 markus 521: }
1.11 markus 522:
523: /* Select server connection if have data to write to the server. */
524: if (packet_have_data_to_write())
1.46 markus 525: FD_SET(connection_out, *writesetp);
1.11 markus 526:
1.123 djm 527: if (control_fd != -1)
528: FD_SET(control_fd, *readsetp);
529:
1.13 markus 530: /*
531: * Wait for something to happen. This will suspend the process until
532: * some selected descriptor can be read, written, or has some other
1.117 markus 533: * event pending.
1.13 markus 534: */
1.11 markus 535:
1.117 markus 536: if (options.server_alive_interval == 0 || !compat20)
537: tvp = NULL;
1.129 deraadt 538: else {
1.117 markus 539: tv.tv_sec = options.server_alive_interval;
540: tv.tv_usec = 0;
541: tvp = &tv;
542: }
543: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
544: if (ret < 0) {
1.11 markus 545: char buf[100];
1.51 markus 546:
547: /*
548: * We have to clear the select masks, because we return.
549: * We have to return, because the mainloop checks for the flags
550: * set by the signal handlers.
551: */
1.87 markus 552: memset(*readsetp, 0, *nallocp);
553: memset(*writesetp, 0, *nallocp);
1.50 deraadt 554:
1.11 markus 555: if (errno == EINTR)
556: return;
557: /* Note: we might still have data in the buffers. */
558: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
559: buffer_append(&stderr_buffer, buf, strlen(buf));
560: quit_pending = 1;
1.117 markus 561: } else if (ret == 0)
562: server_alive_check();
1.11 markus 563: }
564:
1.77 itojun 565: static void
1.31 markus 566: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 567: {
1.11 markus 568: /* Flush stdout and stderr buffers. */
1.31 markus 569: if (buffer_len(bout) > 0)
1.112 deraadt 570: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 571: if (buffer_len(berr) > 0)
1.112 deraadt 572: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 573:
574: leave_raw_mode();
575:
1.13 markus 576: /*
577: * Free (and clear) the buffer to reduce the amount of data that gets
578: * written to swap.
579: */
1.31 markus 580: buffer_free(bin);
581: buffer_free(bout);
582: buffer_free(berr);
1.11 markus 583:
584: /* Send the suspend signal to the program itself. */
585: kill(getpid(), SIGTSTP);
586:
1.132 djm 587: /* Reset window sizes in case they have changed */
588: received_window_change_signal = 1;
1.11 markus 589:
590: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 591: buffer_init(bin);
592: buffer_init(bout);
593: buffer_init(berr);
1.11 markus 594:
595: enter_raw_mode();
596: }
597:
1.77 itojun 598: static void
1.161 deraadt 599: client_process_net_input(fd_set *readset)
1.11 markus 600: {
1.17 markus 601: int len;
602: char buf[8192];
1.11 markus 603:
1.13 markus 604: /*
605: * Read input from the server, and add any such data to the buffer of
606: * the packet subsystem.
607: */
1.11 markus 608: if (FD_ISSET(connection_in, readset)) {
609: /* Read as much as possible. */
610: len = read(connection_in, buf, sizeof(buf));
611: if (len == 0) {
612: /* Received EOF. The remote host has closed the connection. */
613: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
614: host);
1.1 deraadt 615: buffer_append(&stderr_buffer, buf, strlen(buf));
616: quit_pending = 1;
617: return;
1.11 markus 618: }
1.13 markus 619: /*
620: * There is a kernel bug on Solaris that causes select to
621: * sometimes wake up even though there is no data available.
622: */
1.53 millert 623: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 624: len = 0;
625:
626: if (len < 0) {
627: /* An error has encountered. Perhaps there is a network problem. */
628: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
629: host, strerror(errno));
630: buffer_append(&stderr_buffer, buf, strlen(buf));
631: quit_pending = 1;
632: return;
633: }
634: packet_process_incoming(buf, len);
635: }
1.17 markus 636: }
1.16 markus 637:
1.97 jakob 638: static void
1.123 djm 639: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
640: {
641: int id;
642: Channel *c;
1.129 deraadt 643:
1.123 djm 644: id = packet_get_int();
645: packet_check_eom();
646:
647: if ((c = channel_lookup(id)) == NULL) {
648: error("%s: no channel for id %d", __func__, id);
649: return;
650: }
651:
652: if (type == SSH2_MSG_CHANNEL_SUCCESS)
653: debug2("Request suceeded on channel %d", id);
654: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
655: error("Request failed on channel %d", id);
656: channel_free(c);
657: }
658: }
659:
660: static void
661: client_extra_session2_setup(int id, void *arg)
662: {
663: struct confirm_ctx *cctx = arg;
1.140 djm 664: const char *display;
1.123 djm 665: Channel *c;
1.126 djm 666: int i;
1.129 deraadt 667:
1.123 djm 668: if (cctx == NULL)
669: fatal("%s: cctx == NULL", __func__);
670: if ((c = channel_lookup(id)) == NULL)
671: fatal("%s: no channel for id %d", __func__, id);
672:
1.141 djm 673: display = getenv("DISPLAY");
1.140 djm 674: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
675: char *proto, *data;
676: /* Get reasonable local authentication information. */
677: client_x11_get_proto(display, options.xauth_location,
678: options.forward_x11_trusted, &proto, &data);
679: /* Request forwarding with authentication spoofing. */
680: debug("Requesting X11 forwarding with authentication spoofing.");
681: x11_request_forwarding_with_spoofing(id, display, proto, data);
682: /* XXX wait for reply */
683: }
684:
685: if (cctx->want_agent_fwd && options.forward_agent) {
686: debug("Requesting authentication agent forwarding.");
687: channel_request_start(id, "auth-agent-req@openssh.com", 0);
688: packet_send();
689: }
690:
1.129 deraadt 691: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 692: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 693: client_subsystem_reply);
1.127 djm 694:
1.123 djm 695: c->confirm_ctx = NULL;
696: buffer_free(&cctx->cmd);
1.126 djm 697: xfree(cctx->term);
698: if (cctx->env != NULL) {
699: for (i = 0; cctx->env[i] != NULL; i++)
700: xfree(cctx->env[i]);
701: xfree(cctx->env);
1.129 deraadt 702: }
1.126 djm 703: xfree(cctx);
1.123 djm 704: }
705:
706: static void
1.161 deraadt 707: client_process_control(fd_set *readset)
1.123 djm 708: {
709: Buffer m;
710: Channel *c;
1.178 djm 711: int client_fd, new_fd[3], ver, allowed, window, packetmax;
1.123 djm 712: socklen_t addrlen;
713: struct sockaddr_storage addr;
714: struct confirm_ctx *cctx;
715: char *cmd;
1.182 djm 716: u_int i, j, len, env_len, command, flags;
1.123 djm 717: uid_t euid;
718: gid_t egid;
719:
720: /*
721: * Accept connection on control socket
722: */
723: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
724: return;
725:
726: memset(&addr, 0, sizeof(addr));
727: addrlen = sizeof(addr);
728: if ((client_fd = accept(control_fd,
729: (struct sockaddr*)&addr, &addrlen)) == -1) {
730: error("%s accept: %s", __func__, strerror(errno));
731: return;
732: }
733:
734: if (getpeereid(client_fd, &euid, &egid) < 0) {
735: error("%s getpeereid failed: %s", __func__, strerror(errno));
736: close(client_fd);
737: return;
738: }
739: if ((euid != 0) && (getuid() != euid)) {
740: error("control mode uid mismatch: peer euid %u != uid %u",
741: (u_int) euid, (u_int) getuid());
742: close(client_fd);
743: return;
744: }
1.127 djm 745:
1.134 djm 746: unset_nonblock(client_fd);
747:
748: /* Read command */
749: buffer_init(&m);
750: if (ssh_msg_recv(client_fd, &m) == -1) {
751: error("%s: client msg_recv failed", __func__);
752: close(client_fd);
753: buffer_free(&m);
754: return;
755: }
1.140 djm 756: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 757: error("%s: wrong client version %d", __func__, ver);
758: buffer_free(&m);
759: close(client_fd);
760: return;
761: }
762:
1.127 djm 763: allowed = 1;
1.134 djm 764: command = buffer_get_int(&m);
765: flags = buffer_get_int(&m);
1.123 djm 766:
1.134 djm 767: buffer_clear(&m);
1.123 djm 768:
1.134 djm 769: switch (command) {
770: case SSHMUX_COMMAND_OPEN:
1.137 djm 771: if (options.control_master == SSHCTL_MASTER_ASK ||
772: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 773: allowed = ask_permission("Allow shared connection "
774: "to %s? ", host);
775: /* continue below */
776: break;
777: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 778: if (options.control_master == SSHCTL_MASTER_ASK ||
779: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 780: allowed = ask_permission("Terminate shared connection "
781: "to %s? ", host);
782: if (allowed)
783: quit_pending = 1;
1.136 deraadt 784: /* FALLTHROUGH */
1.134 djm 785: case SSHMUX_COMMAND_ALIVE_CHECK:
786: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
787: buffer_clear(&m);
788: buffer_put_int(&m, allowed);
789: buffer_put_int(&m, getpid());
1.140 djm 790: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 791: error("%s: client msg_send failed", __func__);
792: close(client_fd);
793: buffer_free(&m);
794: return;
795: }
796: buffer_free(&m);
797: close(client_fd);
798: return;
799: default:
800: error("Unsupported command %d", command);
801: buffer_free(&m);
802: close(client_fd);
803: return;
804: }
1.123 djm 805:
1.134 djm 806: /* Reply for SSHMUX_COMMAND_OPEN */
807: buffer_clear(&m);
1.127 djm 808: buffer_put_int(&m, allowed);
1.123 djm 809: buffer_put_int(&m, getpid());
1.140 djm 810: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 811: error("%s: client msg_send failed", __func__);
812: close(client_fd);
1.127 djm 813: buffer_free(&m);
1.123 djm 814: return;
815: }
816:
1.127 djm 817: if (!allowed) {
818: error("Refused control connection");
819: close(client_fd);
820: buffer_free(&m);
821: return;
822: }
823:
1.134 djm 824: buffer_clear(&m);
1.123 djm 825: if (ssh_msg_recv(client_fd, &m) == -1) {
826: error("%s: client msg_recv failed", __func__);
827: close(client_fd);
1.127 djm 828: buffer_free(&m);
1.123 djm 829: return;
830: }
1.140 djm 831: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 832: error("%s: wrong client version %d", __func__, ver);
833: buffer_free(&m);
834: close(client_fd);
835: return;
836: }
837:
1.159 djm 838: cctx = xcalloc(1, sizeof(*cctx));
1.134 djm 839: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
840: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 841: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
842: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 843: cctx->term = buffer_get_string(&m, &len);
844:
845: cmd = buffer_get_string(&m, &len);
846: buffer_init(&cctx->cmd);
847: buffer_append(&cctx->cmd, cmd, strlen(cmd));
848:
1.126 djm 849: env_len = buffer_get_int(&m);
850: env_len = MIN(env_len, 4096);
851: debug3("%s: receiving %d env vars", __func__, env_len);
852: if (env_len != 0) {
1.159 djm 853: cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
1.126 djm 854: for (i = 0; i < env_len; i++)
855: cctx->env[i] = buffer_get_string(&m, &len);
856: cctx->env[i] = NULL;
857: }
858:
1.123 djm 859: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
860: cctx->want_tty, cctx->want_subsys, cmd);
1.163 markus 861: xfree(cmd);
1.123 djm 862:
863: /* Gather fds from client */
1.182 djm 864: for(i = 0; i < 3; i++) {
865: if ((new_fd[i] = mm_receive_fd(client_fd)) == -1) {
866: error("%s: failed to receive fd %d from slave",
867: __func__, i);
868: for (j = 0; j < i; j++)
869: close(new_fd[j]);
870: for (j = 0; j < env_len; j++)
871: xfree(cctx->env[j]);
872: if (env_len > 0)
873: xfree(cctx->env);
874: xfree(cctx->term);
875: buffer_free(&cctx->cmd);
1.186 djm 876: close(client_fd);
1.182 djm 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:
1.183 djm 948: bzero(&fwd, sizeof(fwd));
949: fwd.listen_host = fwd.connect_host = NULL;
950:
1.97 jakob 951: leave_raw_mode();
1.101 markus 952: handler = signal(SIGINT, SIG_IGN);
1.99 markus 953: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 954: if (s == NULL)
955: goto out;
1.179 tedu 956: while (isspace(*s))
1.97 jakob 957: s++;
1.121 djm 958: if (*s == '-')
959: s++; /* Skip cmdline '-', if any */
1.120 dtucker 960: if (*s == '\0')
1.97 jakob 961: goto out;
1.121 djm 962:
1.122 djm 963: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 964: logit("Commands:");
1.164 djm 965: logit(" -L[bind_address:]port:host:hostport "
966: "Request local forward");
967: logit(" -R[bind_address:]port:host:hostport "
968: "Request remote forward");
1.165 stevesk 969: logit(" -KR[bind_address:]port "
1.164 djm 970: "Cancel remote forward");
1.146 reyk 971: if (!options.permit_local_command)
972: goto out;
1.164 djm 973: logit(" !args "
974: "Execute local command");
1.146 reyk 975: goto out;
976: }
977:
978: if (*s == '!' && options.permit_local_command) {
979: s++;
980: ssh_local_cmd(s);
1.121 djm 981: goto out;
982: }
983:
984: if (*s == 'K') {
985: delete = 1;
986: s++;
987: }
988: if (*s != 'L' && *s != 'R') {
1.109 itojun 989: logit("Invalid command.");
1.97 jakob 990: goto out;
991: }
1.121 djm 992: if (*s == 'L')
1.97 jakob 993: local = 1;
1.121 djm 994: if (local && delete) {
995: logit("Not supported.");
996: goto out;
997: }
998: if ((!local || delete) && !compat20) {
1.109 itojun 999: logit("Not supported for SSH protocol version 1.");
1.97 jakob 1000: goto out;
1001: }
1.121 djm 1002:
1.179 tedu 1003: while (isspace(*++s))
1004: ;
1.97 jakob 1005:
1.121 djm 1006: if (delete) {
1.135 djm 1007: cancel_port = 0;
1008: cancel_host = hpdelim(&s); /* may be NULL */
1009: if (s != NULL) {
1010: cancel_port = a2port(s);
1011: cancel_host = cleanhostname(cancel_host);
1012: } else {
1013: cancel_port = a2port(cancel_host);
1014: cancel_host = NULL;
1.121 djm 1015: }
1.135 djm 1016: if (cancel_port == 0) {
1017: logit("Bad forwarding close port");
1.121 djm 1018: goto out;
1019: }
1.135 djm 1020: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 1021: } else {
1.135 djm 1022: if (!parse_forward(&fwd, s)) {
1.121 djm 1023: logit("Bad forwarding specification.");
1024: goto out;
1025: }
1026: if (local) {
1.135 djm 1027: if (channel_setup_local_fwd_listener(fwd.listen_host,
1028: fwd.listen_port, fwd.connect_host,
1029: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 1030: logit("Port forwarding failed.");
1031: goto out;
1032: }
1.135 djm 1033: } else {
1.167 markus 1034: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 1035: fwd.listen_port, fwd.connect_host,
1.167 markus 1036: fwd.connect_port) < 0) {
1037: logit("Port forwarding failed.");
1038: goto out;
1039: }
1.135 djm 1040: }
1041:
1.121 djm 1042: logit("Forwarding port.");
1043: }
1044:
1.97 jakob 1045: out:
1046: signal(SIGINT, handler);
1047: enter_raw_mode();
1048: if (cmd)
1049: xfree(cmd);
1.183 djm 1050: if (fwd.listen_host != NULL)
1051: xfree(fwd.listen_host);
1052: if (fwd.connect_host != NULL)
1053: xfree(fwd.connect_host);
1.97 jakob 1054: }
1055:
1.31 markus 1056: /* process the characters one by one */
1.77 itojun 1057: static int
1.31 markus 1058: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1059: {
1.32 markus 1060: char string[1024];
1.31 markus 1061: pid_t pid;
1062: int bytes = 0;
1.42 markus 1063: u_int i;
1064: u_char ch;
1.31 markus 1065: char *s;
1066:
1.139 djm 1067: if (len <= 0)
1068: return (0);
1069:
1070: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1071: /* Get one character at a time. */
1072: ch = buf[i];
1073:
1074: if (escape_pending) {
1075: /* We have previously seen an escape character. */
1076: /* Clear the flag now. */
1077: escape_pending = 0;
1078:
1079: /* Process the escaped character. */
1080: switch (ch) {
1081: case '.':
1082: /* Terminate the connection. */
1.32 markus 1083: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1084: buffer_append(berr, string, strlen(string));
1.31 markus 1085:
1086: quit_pending = 1;
1087: return -1;
1088:
1089: case 'Z' - 64:
1090: /* Suspend the program. */
1091: /* Print a message to that effect to the user. */
1.32 markus 1092: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1093: buffer_append(berr, string, strlen(string));
1.31 markus 1094:
1095: /* Restore terminal modes and suspend. */
1096: client_suspend_self(bin, bout, berr);
1097:
1098: /* We have been continued. */
1099: continue;
1100:
1.111 markus 1101: case 'B':
1102: if (compat20) {
1103: snprintf(string, sizeof string,
1104: "%cB\r\n", escape_char);
1105: buffer_append(berr, string,
1106: strlen(string));
1107: channel_request_start(session_ident,
1108: "break", 0);
1109: packet_put_int(1000);
1110: packet_send();
1111: }
1112: continue;
1113:
1.54 markus 1114: case 'R':
1.59 markus 1115: if (compat20) {
1116: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1117: logit("Server does not support re-keying");
1.59 markus 1118: else
1119: need_rekeying = 1;
1120: }
1.54 markus 1121: continue;
1122:
1.31 markus 1123: case '&':
1124: /*
1125: * Detach the program (continue to serve connections,
1126: * but put in background and no more new connections).
1127: */
1128: /* Restore tty modes. */
1129: leave_raw_mode();
1130:
1131: /* Stop listening for new connections. */
1.86 markus 1132: channel_stop_listening();
1.31 markus 1133:
1.86 markus 1134: snprintf(string, sizeof string,
1135: "%c& [backgrounded]\n", escape_char);
1136: buffer_append(berr, string, strlen(string));
1.31 markus 1137:
1138: /* Fork into background. */
1139: pid = fork();
1140: if (pid < 0) {
1141: error("fork: %.100s", strerror(errno));
1142: continue;
1143: }
1144: if (pid != 0) { /* This is the parent. */
1145: /* The parent just exits. */
1146: exit(0);
1147: }
1148: /* The child continues serving connections. */
1.86 markus 1149: if (compat20) {
1150: buffer_append(bin, "\004", 1);
1151: /* fake EOF on stdin */
1152: return -1;
1153: } else if (!stdin_eof) {
1154: /*
1155: * Sending SSH_CMSG_EOF alone does not always appear
1156: * to be enough. So we try to send an EOF character
1157: * first.
1158: */
1159: packet_start(SSH_CMSG_STDIN_DATA);
1160: packet_put_string("\004", 1);
1161: packet_send();
1162: /* Close stdin. */
1163: stdin_eof = 1;
1164: if (buffer_len(bin) == 0) {
1165: packet_start(SSH_CMSG_EOF);
1166: packet_send();
1167: }
1168: }
1169: continue;
1.31 markus 1170:
1171: case '?':
1.32 markus 1172: snprintf(string, sizeof string,
1.31 markus 1173: "%c?\r\n\
1174: Supported escape sequences:\r\n\
1.104 stevesk 1175: %c. - terminate connection\r\n\
1.111 markus 1176: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1177: %cC - open a command line\r\n\
1178: %cR - Request rekey (SSH protocol 2 only)\r\n\
1179: %c^Z - suspend ssh\r\n\
1180: %c# - list forwarded connections\r\n\
1181: %c& - background ssh (when waiting for connections to terminate)\r\n\
1182: %c? - this message\r\n\
1183: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1184: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1185: escape_char, escape_char, escape_char, escape_char,
1186: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1187: escape_char, escape_char, escape_char);
1.32 markus 1188: buffer_append(berr, string, strlen(string));
1.31 markus 1189: continue;
1190:
1191: case '#':
1.32 markus 1192: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1193: buffer_append(berr, string, strlen(string));
1.31 markus 1194: s = channel_open_message();
1195: buffer_append(berr, s, strlen(s));
1196: xfree(s);
1.97 jakob 1197: continue;
1198:
1199: case 'C':
1.99 markus 1200: process_cmdline();
1.31 markus 1201: continue;
1202:
1203: default:
1204: if (ch != escape_char) {
1205: buffer_put_char(bin, escape_char);
1206: bytes++;
1207: }
1208: /* Escaped characters fall through here */
1209: break;
1210: }
1211: } else {
1212: /*
1213: * The previous character was not an escape char. Check if this
1214: * is an escape.
1215: */
1216: if (last_was_cr && ch == escape_char) {
1217: /* It is. Set the flag and continue to next character. */
1218: escape_pending = 1;
1219: continue;
1220: }
1221: }
1222:
1223: /*
1224: * Normal character. Record whether it was a newline,
1225: * and append it to the buffer.
1226: */
1227: last_was_cr = (ch == '\r' || ch == '\n');
1228: buffer_put_char(bin, ch);
1229: bytes++;
1230: }
1231: return bytes;
1232: }
1233:
1.77 itojun 1234: static void
1.161 deraadt 1235: client_process_input(fd_set *readset)
1.17 markus 1236: {
1.21 deraadt 1237: int len;
1.31 markus 1238: char buf[8192];
1.16 markus 1239:
1.11 markus 1240: /* Read input from stdin. */
1241: if (FD_ISSET(fileno(stdin), readset)) {
1242: /* Read as much as possible. */
1243: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1244: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1245: return; /* we'll try again later */
1.11 markus 1246: if (len <= 0) {
1.13 markus 1247: /*
1248: * Received EOF or error. They are treated
1249: * similarly, except that an error message is printed
1250: * if it was an error condition.
1251: */
1.11 markus 1252: if (len < 0) {
1253: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1254: buffer_append(&stderr_buffer, buf, strlen(buf));
1255: }
1256: /* Mark that we have seen EOF. */
1257: stdin_eof = 1;
1.13 markus 1258: /*
1259: * Send an EOF message to the server unless there is
1260: * data in the buffer. If there is data in the
1261: * buffer, no message will be sent now. Code
1262: * elsewhere will send the EOF when the buffer
1263: * becomes empty if stdin_eof is set.
1264: */
1.11 markus 1265: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1266: packet_start(SSH_CMSG_EOF);
1267: packet_send();
1.11 markus 1268: }
1.72 stevesk 1269: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1270: /*
1271: * Normal successful read, and no escape character.
1272: * Just append the data to buffer.
1273: */
1.11 markus 1274: buffer_append(&stdin_buffer, buf, len);
1275: } else {
1.13 markus 1276: /*
1277: * Normal, successful read. But we have an escape character
1278: * and have to process the characters one by one.
1279: */
1.52 markus 1280: if (process_escapes(&stdin_buffer, &stdout_buffer,
1281: &stderr_buffer, buf, len) == -1)
1.31 markus 1282: return;
1.11 markus 1283: }
1284: }
1285: }
1286:
1.77 itojun 1287: static void
1.161 deraadt 1288: client_process_output(fd_set *writeset)
1.11 markus 1289: {
1290: int len;
1291: char buf[100];
1.1 deraadt 1292:
1.11 markus 1293: /* Write buffered output to stdout. */
1294: if (FD_ISSET(fileno(stdout), writeset)) {
1295: /* Write as much data as possible. */
1296: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1297: buffer_len(&stdout_buffer));
1.11 markus 1298: if (len <= 0) {
1.64 markus 1299: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1300: len = 0;
1301: else {
1.13 markus 1302: /*
1303: * An error or EOF was encountered. Put an
1304: * error message to stderr buffer.
1305: */
1.11 markus 1306: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1307: buffer_append(&stderr_buffer, buf, strlen(buf));
1308: quit_pending = 1;
1309: return;
1310: }
1311: }
1312: /* Consume printed data from the buffer. */
1313: buffer_consume(&stdout_buffer, len);
1.57 markus 1314: stdout_bytes += len;
1.11 markus 1315: }
1316: /* Write buffered output to stderr. */
1317: if (FD_ISSET(fileno(stderr), writeset)) {
1318: /* Write as much data as possible. */
1319: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1320: buffer_len(&stderr_buffer));
1.11 markus 1321: if (len <= 0) {
1.64 markus 1322: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1323: len = 0;
1324: else {
1.13 markus 1325: /* EOF or error, but can't even print error message. */
1.11 markus 1326: quit_pending = 1;
1327: return;
1328: }
1329: }
1330: /* Consume printed characters from the buffer. */
1331: buffer_consume(&stderr_buffer, len);
1.57 markus 1332: stderr_bytes += len;
1.11 markus 1333: }
1.1 deraadt 1334: }
1335:
1.13 markus 1336: /*
1.15 markus 1337: * Get packets from the connection input buffer, and process them as long as
1338: * there are packets available.
1339: *
1340: * Any unknown packets received during the actual
1341: * session cause the session to terminate. This is
1342: * intended to make debugging easier since no
1343: * confirmations are sent. Any compatible protocol
1344: * extensions must be negotiated during the
1345: * preparatory phase.
1346: */
1347:
1.77 itojun 1348: static void
1.49 itojun 1349: client_process_buffered_input_packets(void)
1.15 markus 1350: {
1.54 markus 1351: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1352: }
1353:
1.31 markus 1354: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1355:
1.77 itojun 1356: static int
1.31 markus 1357: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1358: {
1.31 markus 1359: /* XXX we assume c->extended is writeable */
1360: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1361: }
1362:
1.77 itojun 1363: static void
1.60 markus 1364: client_channel_closed(int id, void *arg)
1365: {
1.83 markus 1366: channel_cancel_cleanup(id);
1.60 markus 1367: session_closed = 1;
1.113 markus 1368: leave_raw_mode();
1.60 markus 1369: }
1370:
1.15 markus 1371: /*
1.13 markus 1372: * Implements the interactive session with the server. This is called after
1373: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1374: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1375: * used as an escape character for terminating or suspending the session.
1.13 markus 1376: */
1.1 deraadt 1377:
1.20 markus 1378: int
1.30 markus 1379: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1380: {
1.46 markus 1381: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1382: double start_time, total_time;
1.130 avsm 1383: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1384: u_int nalloc = 0;
1.11 markus 1385: char buf[100];
1386:
1387: debug("Entering interactive session.");
1388:
1389: start_time = get_current_time();
1390:
1391: /* Initialize variables. */
1392: escape_pending = 0;
1393: last_was_cr = 1;
1394: exit_status = -1;
1395: stdin_eof = 0;
1396: buffer_high = 64 * 1024;
1397: connection_in = packet_get_connection_in();
1398: connection_out = packet_get_connection_out();
1.46 markus 1399: max_fd = MAX(connection_in, connection_out);
1.123 djm 1400: if (control_fd != -1)
1401: max_fd = MAX(max_fd, control_fd);
1.46 markus 1402:
1403: if (!compat20) {
1.63 markus 1404: /* enable nonblocking unless tty */
1405: if (!isatty(fileno(stdin)))
1406: set_nonblock(fileno(stdin));
1407: if (!isatty(fileno(stdout)))
1408: set_nonblock(fileno(stdout));
1409: if (!isatty(fileno(stderr)))
1410: set_nonblock(fileno(stderr));
1.46 markus 1411: max_fd = MAX(max_fd, fileno(stdin));
1412: max_fd = MAX(max_fd, fileno(stdout));
1413: max_fd = MAX(max_fd, fileno(stderr));
1414: }
1.11 markus 1415: stdin_bytes = 0;
1416: stdout_bytes = 0;
1417: stderr_bytes = 0;
1418: quit_pending = 0;
1419: escape_char = escape_char_arg;
1420:
1421: /* Initialize buffers. */
1422: buffer_init(&stdin_buffer);
1423: buffer_init(&stdout_buffer);
1424: buffer_init(&stderr_buffer);
1425:
1.15 markus 1426: client_init_dispatch();
1427:
1.105 markus 1428: /*
1429: * Set signal handlers, (e.g. to restore non-blocking mode)
1430: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1431: */
1.131 djm 1432: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1433: signal(SIGHUP, signal_handler);
1.105 markus 1434: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1435: signal(SIGINT, signal_handler);
1436: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1437: signal(SIGQUIT, signal_handler);
1438: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1439: signal(SIGTERM, signal_handler);
1.132 djm 1440: signal(SIGWINCH, window_change_handler);
1.11 markus 1441:
1442: if (have_pty)
1443: enter_raw_mode();
1444:
1.48 markus 1445: if (compat20) {
1446: session_ident = ssh2_chan_id;
1.72 stevesk 1447: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1448: channel_register_filter(session_ident,
1.149 reyk 1449: simple_escape_filter, NULL);
1.60 markus 1450: if (session_ident != -1)
1451: channel_register_cleanup(session_ident,
1.143 djm 1452: client_channel_closed, 0);
1.48 markus 1453: } else {
1454: /* Check if we should immediately send eof on stdin. */
1.16 markus 1455: client_check_initial_eof_on_stdin();
1.48 markus 1456: }
1.30 markus 1457:
1.11 markus 1458: /* Main loop of the client for the interactive session mode. */
1459: while (!quit_pending) {
1460:
1.13 markus 1461: /* Process buffered packets sent by the server. */
1.11 markus 1462: client_process_buffered_input_packets();
1463:
1.60 markus 1464: if (compat20 && session_closed && !channel_still_open())
1465: break;
1466:
1.56 markus 1467: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1468:
1.56 markus 1469: if (rekeying) {
1470: debug("rekeying in progress");
1471: } else {
1472: /*
1473: * Make packets of buffered stdin data, and buffer
1474: * them for sending to the server.
1475: */
1476: if (!compat20)
1477: client_make_packets_from_stdin_data();
1.11 markus 1478:
1.56 markus 1479: /*
1480: * Make packets from buffered channel data, and
1481: * enqueue them for sending to the server.
1482: */
1483: if (packet_not_very_much_data_to_write())
1484: channel_output_poll();
1.11 markus 1485:
1.56 markus 1486: /*
1487: * Check if the window size has changed, and buffer a
1488: * message about it to the server if so.
1489: */
1490: client_check_window_change();
1.11 markus 1491:
1.56 markus 1492: if (quit_pending)
1493: break;
1494: }
1.13 markus 1495: /*
1496: * Wait until we have something to do (something becomes
1497: * available on one of the descriptors).
1498: */
1.81 markus 1499: max_fd2 = max_fd;
1.56 markus 1500: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1501: &max_fd2, &nalloc, rekeying);
1.11 markus 1502:
1503: if (quit_pending)
1504: break;
1505:
1.56 markus 1506: /* Do channel operations unless rekeying in progress. */
1507: if (!rekeying) {
1508: channel_after_select(readset, writeset);
1.108 markus 1509: if (need_rekeying || packet_need_rekeying()) {
1510: debug("need rekeying");
1.56 markus 1511: xxx_kex->done = 0;
1512: kex_send_kexinit(xxx_kex);
1513: need_rekeying = 0;
1514: }
1515: }
1.11 markus 1516:
1.17 markus 1517: /* Buffer input from the connection. */
1.46 markus 1518: client_process_net_input(readset);
1.17 markus 1519:
1.123 djm 1520: /* Accept control connections. */
1521: client_process_control(readset);
1522:
1.17 markus 1523: if (quit_pending)
1524: break;
1.11 markus 1525:
1.17 markus 1526: if (!compat20) {
1527: /* Buffer data from stdin */
1.46 markus 1528: client_process_input(readset);
1.17 markus 1529: /*
1530: * Process output to stdout and stderr. Output to
1531: * the connection is processed elsewhere (above).
1532: */
1.46 markus 1533: client_process_output(writeset);
1.17 markus 1534: }
1.11 markus 1535:
1.13 markus 1536: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1537: if (FD_ISSET(connection_out, writeset))
1.11 markus 1538: packet_write_poll();
1539: }
1.46 markus 1540: if (readset)
1541: xfree(readset);
1542: if (writeset)
1543: xfree(writeset);
1.11 markus 1544:
1545: /* Terminate the session. */
1546:
1547: /* Stop watching for window change. */
1.132 djm 1548: signal(SIGWINCH, SIG_DFL);
1.11 markus 1549:
1.76 markus 1550: channel_free_all();
1.11 markus 1551:
1.75 markus 1552: if (have_pty)
1553: leave_raw_mode();
1554:
1555: /* restore blocking io */
1556: if (!isatty(fileno(stdin)))
1557: unset_nonblock(fileno(stdin));
1558: if (!isatty(fileno(stdout)))
1559: unset_nonblock(fileno(stdout));
1560: if (!isatty(fileno(stderr)))
1561: unset_nonblock(fileno(stderr));
1.116 dtucker 1562:
1563: /*
1564: * If there was no shell or command requested, there will be no remote
1565: * exit status to be returned. In that case, clear error code if the
1566: * connection was deliberately terminated at this end.
1567: */
1568: if (no_shell_flag && received_signal == SIGTERM) {
1569: received_signal = 0;
1570: exit_status = 0;
1571: }
1.75 markus 1572:
1.113 markus 1573: if (received_signal)
1.89 itojun 1574: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1575:
1.13 markus 1576: /*
1577: * In interactive mode (with pseudo tty) display a message indicating
1578: * that the connection has been closed.
1579: */
1.11 markus 1580: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1581: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1582: buffer_append(&stderr_buffer, buf, strlen(buf));
1583: }
1.70 markus 1584:
1.11 markus 1585: /* Output any buffered data for stdout. */
1.70 markus 1586: while (buffer_len(&stdout_buffer) > 0) {
1587: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1588: buffer_len(&stdout_buffer));
1.70 markus 1589: if (len <= 0) {
1.11 markus 1590: error("Write failed flushing stdout buffer.");
1.70 markus 1591: break;
1592: }
1.11 markus 1593: buffer_consume(&stdout_buffer, len);
1.57 markus 1594: stdout_bytes += len;
1.11 markus 1595: }
1596:
1597: /* Output any buffered data for stderr. */
1.70 markus 1598: while (buffer_len(&stderr_buffer) > 0) {
1599: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1600: buffer_len(&stderr_buffer));
1.70 markus 1601: if (len <= 0) {
1.11 markus 1602: error("Write failed flushing stderr buffer.");
1.70 markus 1603: break;
1604: }
1.11 markus 1605: buffer_consume(&stderr_buffer, len);
1.57 markus 1606: stderr_bytes += len;
1.11 markus 1607: }
1608:
1609: /* Clear and free any buffers. */
1610: memset(buf, 0, sizeof(buf));
1611: buffer_free(&stdin_buffer);
1612: buffer_free(&stdout_buffer);
1613: buffer_free(&stderr_buffer);
1614:
1615: /* Report bytes transferred, and transfer rates. */
1616: total_time = get_current_time() - start_time;
1617: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1618: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1619: if (total_time > 0)
1620: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1621: stdin_bytes / total_time, stdout_bytes / total_time,
1622: stderr_bytes / total_time);
1.11 markus 1623:
1624: /* Return the exit status of the program. */
1625: debug("Exit status %d", exit_status);
1626: return exit_status;
1.15 markus 1627: }
1628:
1629: /*********/
1630:
1.77 itojun 1631: static void
1.94 markus 1632: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1633: {
1.42 markus 1634: u_int data_len;
1.15 markus 1635: char *data = packet_get_string(&data_len);
1.93 markus 1636: packet_check_eom();
1.15 markus 1637: buffer_append(&stdout_buffer, data, data_len);
1638: memset(data, 0, data_len);
1639: xfree(data);
1640: }
1.77 itojun 1641: static void
1.94 markus 1642: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1643: {
1.42 markus 1644: u_int data_len;
1.15 markus 1645: char *data = packet_get_string(&data_len);
1.93 markus 1646: packet_check_eom();
1.15 markus 1647: buffer_append(&stderr_buffer, data, data_len);
1648: memset(data, 0, data_len);
1649: xfree(data);
1650: }
1.77 itojun 1651: static void
1.94 markus 1652: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1653: {
1654: exit_status = packet_get_int();
1.93 markus 1655: packet_check_eom();
1.15 markus 1656: /* Acknowledge the exit. */
1657: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1658: packet_send();
1659: /*
1660: * Must wait for packet to be sent since we are
1661: * exiting the loop.
1662: */
1663: packet_write_wait();
1664: /* Flag that we want to exit. */
1665: quit_pending = 1;
1666: }
1.115 markus 1667: static void
1668: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1669: {
1670: Channel *c = NULL;
1671: int remote_id, sock;
1672:
1673: /* Read the remote channel number from the message. */
1674: remote_id = packet_get_int();
1675: packet_check_eom();
1676:
1677: /*
1678: * Get a connection to the local authentication agent (this may again
1679: * get forwarded).
1680: */
1681: sock = ssh_get_authentication_socket();
1682:
1683: /*
1684: * If we could not connect the agent, send an error message back to
1685: * the server. This should never happen unless the agent dies,
1686: * because authentication forwarding is only enabled if we have an
1687: * agent.
1688: */
1689: if (sock >= 0) {
1690: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1691: -1, 0, 0, 0, "authentication agent connection", 1);
1692: c->remote_id = remote_id;
1693: c->force_drain = 1;
1694: }
1695: if (c == NULL) {
1696: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1697: packet_put_int(remote_id);
1698: } else {
1699: /* Send a confirmation to the remote host. */
1700: debug("Forwarding authentication connection.");
1701: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1702: packet_put_int(remote_id);
1703: packet_put_int(c->self);
1704: }
1705: packet_send();
1706: }
1.15 markus 1707:
1.77 itojun 1708: static Channel *
1.40 markus 1709: client_request_forwarded_tcpip(const char *request_type, int rchan)
1710: {
1.103 deraadt 1711: Channel *c = NULL;
1.40 markus 1712: char *listen_address, *originator_address;
1713: int listen_port, originator_port;
1.67 markus 1714: int sock;
1.40 markus 1715:
1716: /* Get rest of the packet */
1717: listen_address = packet_get_string(NULL);
1718: listen_port = packet_get_int();
1719: originator_address = packet_get_string(NULL);
1720: originator_port = packet_get_int();
1.93 markus 1721: packet_check_eom();
1.40 markus 1722:
1723: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1724: listen_address, listen_port, originator_address, originator_port);
1725:
1.80 stevesk 1726: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1727: if (sock < 0) {
1728: xfree(originator_address);
1729: xfree(listen_address);
1730: return NULL;
1731: }
1732: c = channel_new("forwarded-tcpip",
1733: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1.185 dtucker 1734: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1735: originator_address, 1);
1.40 markus 1736: xfree(originator_address);
1737: xfree(listen_address);
1738: return c;
1739: }
1740:
1.103 deraadt 1741: static Channel *
1.40 markus 1742: client_request_x11(const char *request_type, int rchan)
1743: {
1744: Channel *c = NULL;
1745: char *originator;
1746: int originator_port;
1.67 markus 1747: int sock;
1.40 markus 1748:
1749: if (!options.forward_x11) {
1750: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1751: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1752: return NULL;
1753: }
1754: originator = packet_get_string(NULL);
1755: if (datafellows & SSH_BUG_X11FWD) {
1756: debug2("buggy server: x11 request w/o originator_port");
1757: originator_port = 0;
1758: } else {
1759: originator_port = packet_get_int();
1760: }
1.93 markus 1761: packet_check_eom();
1.40 markus 1762: /* XXX check permission */
1.47 markus 1763: debug("client_request_x11: request from %s %d", originator,
1764: originator_port);
1.67 markus 1765: xfree(originator);
1.40 markus 1766: sock = x11_connect_display();
1.67 markus 1767: if (sock < 0)
1768: return NULL;
1769: c = channel_new("x11",
1770: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1771: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1772: c->force_drain = 1;
1.40 markus 1773: return c;
1774: }
1775:
1.103 deraadt 1776: static Channel *
1.40 markus 1777: client_request_agent(const char *request_type, int rchan)
1778: {
1779: Channel *c = NULL;
1.67 markus 1780: int sock;
1.40 markus 1781:
1782: if (!options.forward_agent) {
1783: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1784: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1785: return NULL;
1786: }
1.177 stevesk 1787: sock = ssh_get_authentication_socket();
1.67 markus 1788: if (sock < 0)
1789: return NULL;
1790: c = channel_new("authentication agent connection",
1791: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1792: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1793: "authentication agent connection", 1);
1.82 markus 1794: c->force_drain = 1;
1.40 markus 1795: return c;
1.180 djm 1796: }
1797:
1798: int
1799: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1800: {
1801: Channel *c;
1802: int fd;
1803:
1804: if (tun_mode == SSH_TUNMODE_NO)
1805: return 0;
1806:
1807: if (!compat20) {
1808: error("Tunnel forwarding is not support for protocol 1");
1809: return -1;
1810: }
1811:
1812: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1813:
1814: /* Open local tunnel device */
1815: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1816: error("Tunnel device open failed.");
1817: return -1;
1818: }
1819:
1820: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1821: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1822: c->datagram = 1;
1823:
1824: packet_start(SSH2_MSG_CHANNEL_OPEN);
1825: packet_put_cstring("tun@openssh.com");
1826: packet_put_int(c->self);
1827: packet_put_int(c->local_window_max);
1828: packet_put_int(c->local_maxpacket);
1829: packet_put_int(tun_mode);
1830: packet_put_int(remote_tun);
1831: packet_send();
1832:
1833: return 0;
1.40 markus 1834: }
1835:
1.22 markus 1836: /* XXXX move to generic input handler */
1.77 itojun 1837: static void
1.94 markus 1838: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1839: {
1840: Channel *c = NULL;
1841: char *ctype;
1842: int rchan;
1.102 markus 1843: u_int rmaxpack, rwindow, len;
1.22 markus 1844:
1845: ctype = packet_get_string(&len);
1846: rchan = packet_get_int();
1847: rwindow = packet_get_int();
1848: rmaxpack = packet_get_int();
1849:
1.24 markus 1850: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1851: ctype, rchan, rwindow, rmaxpack);
1852:
1.40 markus 1853: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1854: c = client_request_forwarded_tcpip(ctype, rchan);
1855: } else if (strcmp(ctype, "x11") == 0) {
1856: c = client_request_x11(ctype, rchan);
1857: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1858: c = client_request_agent(ctype, rchan);
1.22 markus 1859: }
1860: /* XXX duplicate : */
1861: if (c != NULL) {
1862: debug("confirm %s", ctype);
1863: c->remote_id = rchan;
1864: c->remote_window = rwindow;
1865: c->remote_maxpacket = rmaxpack;
1.69 markus 1866: if (c->type != SSH_CHANNEL_CONNECTING) {
1867: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1868: packet_put_int(c->remote_id);
1869: packet_put_int(c->self);
1870: packet_put_int(c->local_window);
1871: packet_put_int(c->local_maxpacket);
1872: packet_send();
1873: }
1.22 markus 1874: } else {
1875: debug("failure %s", ctype);
1876: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1877: packet_put_int(rchan);
1878: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1879: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1880: packet_put_cstring("open failed");
1.66 markus 1881: packet_put_cstring("");
1882: }
1.22 markus 1883: packet_send();
1884: }
1885: xfree(ctype);
1886: }
1.77 itojun 1887: static void
1.94 markus 1888: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1889: {
1890: Channel *c = NULL;
1.123 djm 1891: int exitval, id, reply, success = 0;
1.48 markus 1892: char *rtype;
1893:
1894: id = packet_get_int();
1895: rtype = packet_get_string(NULL);
1896: reply = packet_get_char();
1897:
1898: debug("client_input_channel_req: channel %d rtype %s reply %d",
1899: id, rtype, reply);
1900:
1.128 djm 1901: if (id == -1) {
1902: error("client_input_channel_req: request for channel -1");
1903: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1904: error("client_input_channel_req: channel %d: unknown channel", id);
1905: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1906: exitval = packet_get_int();
1907: if (id == session_ident) {
1908: success = 1;
1909: exit_status = exitval;
1910: } else if (c->ctl_fd == -1) {
1911: error("client_input_channel_req: unexpected channel %d",
1912: session_ident);
1913: } else {
1914: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1915: success = 1;
1916: }
1.93 markus 1917: packet_check_eom();
1.48 markus 1918: }
1919: if (reply) {
1920: packet_start(success ?
1921: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1922: packet_put_int(id);
1.48 markus 1923: packet_send();
1924: }
1925: xfree(rtype);
1926: }
1.95 markus 1927: static void
1928: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1929: {
1930: char *rtype;
1931: int want_reply;
1932: int success = 0;
1933:
1934: rtype = packet_get_string(NULL);
1935: want_reply = packet_get_char();
1.117 markus 1936: debug("client_input_global_request: rtype %s want_reply %d",
1937: rtype, want_reply);
1.95 markus 1938: if (want_reply) {
1939: packet_start(success ?
1940: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1941: packet_send();
1942: packet_write_wait();
1943: }
1944: xfree(rtype);
1945: }
1.22 markus 1946:
1.123 djm 1947: void
1.129 deraadt 1948: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1949: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1950: dispatch_fn *subsys_repl)
1951: {
1952: int len;
1.132 djm 1953: Channel *c = NULL;
1.123 djm 1954:
1955: debug2("%s: id %d", __func__, id);
1956:
1.132 djm 1957: if ((c = channel_lookup(id)) == NULL)
1958: fatal("client_session2_setup: channel %d: unknown channel", id);
1959:
1.123 djm 1960: if (want_tty) {
1961: struct winsize ws;
1962: struct termios tio;
1963:
1964: /* Store window size in the packet. */
1965: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1966: memset(&ws, 0, sizeof(ws));
1967:
1968: channel_request_start(id, "pty-req", 0);
1969: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1970: packet_put_int((u_int)ws.ws_col);
1971: packet_put_int((u_int)ws.ws_row);
1972: packet_put_int((u_int)ws.ws_xpixel);
1973: packet_put_int((u_int)ws.ws_ypixel);
1.123 djm 1974: tio = get_saved_tio();
1975: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1976: packet_send();
1977: /* XXX wait for reply */
1.132 djm 1978: c->client_tty = 1;
1.123 djm 1979: }
1980:
1981: /* Transfer any environment variables from client to server */
1.126 djm 1982: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1983: int i, j, matched;
1984: char *name, *val;
1985:
1986: debug("Sending environment.");
1.126 djm 1987: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1988: /* Split */
1.126 djm 1989: name = xstrdup(env[i]);
1.123 djm 1990: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1991: xfree(name);
1.123 djm 1992: continue;
1993: }
1994: *val++ = '\0';
1995:
1996: matched = 0;
1997: for (j = 0; j < options.num_send_env; j++) {
1998: if (match_pattern(name, options.send_env[j])) {
1999: matched = 1;
2000: break;
2001: }
2002: }
2003: if (!matched) {
2004: debug3("Ignored env %s", name);
1.144 stevesk 2005: xfree(name);
1.123 djm 2006: continue;
2007: }
2008:
2009: debug("Sending env %s = %s", name, val);
2010: channel_request_start(id, "env", 0);
2011: packet_put_cstring(name);
2012: packet_put_cstring(val);
2013: packet_send();
1.144 stevesk 2014: xfree(name);
1.123 djm 2015: }
2016: }
2017:
2018: len = buffer_len(cmd);
2019: if (len > 0) {
2020: if (len > 900)
2021: len = 900;
2022: if (want_subsystem) {
2023: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
2024: channel_request_start(id, "subsystem", subsys_repl != NULL);
2025: if (subsys_repl != NULL) {
2026: /* register callback for reply */
2027: /* XXX we assume that client_loop has already been called */
2028: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
2029: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
2030: }
2031: } else {
2032: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
2033: channel_request_start(id, "exec", 0);
2034: }
2035: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2036: packet_send();
2037: } else {
2038: channel_request_start(id, "shell", 0);
2039: packet_send();
2040: }
2041: }
2042:
1.77 itojun 2043: static void
1.49 itojun 2044: client_init_dispatch_20(void)
1.16 markus 2045: {
1.55 markus 2046: dispatch_init(&dispatch_protocol_error);
1.100 markus 2047:
1.16 markus 2048: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2049: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2050: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2051: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2052: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2053: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2054: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2055: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2056: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 2057: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2058:
2059: /* rekeying */
2060: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2061:
2062: /* global request reply messages */
2063: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2064: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 2065: }
1.77 itojun 2066: static void
1.49 itojun 2067: client_init_dispatch_13(void)
1.15 markus 2068: {
2069: dispatch_init(NULL);
2070: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2071: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2072: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2073: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2074: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2075: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2076: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2077: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2078: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2079:
2080: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2081: &client_input_agent_open : &deny_input_open);
1.39 markus 2082: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2083: &x11_input_open : &deny_input_open);
1.15 markus 2084: }
1.77 itojun 2085: static void
1.49 itojun 2086: client_init_dispatch_15(void)
1.15 markus 2087: {
2088: client_init_dispatch_13();
2089: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2090: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2091: }
1.79 stevesk 2092: static void
1.49 itojun 2093: client_init_dispatch(void)
1.15 markus 2094: {
1.16 markus 2095: if (compat20)
2096: client_init_dispatch_20();
2097: else if (compat13)
1.15 markus 2098: client_init_dispatch_13();
2099: else
2100: client_init_dispatch_15();
1.113 markus 2101: }
2102:
2103: /* client specific fatal cleanup */
2104: void
1.114 markus 2105: cleanup_exit(int i)
1.113 markus 2106: {
2107: leave_raw_mode();
2108: leave_non_blocking();
1.123 djm 2109: if (options.control_path != NULL && control_fd != -1)
2110: unlink(options.control_path);
1.114 markus 2111: _exit(i);
1.1 deraadt 2112: }
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