Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.185
1.185 ! dtucker 1: /* $OpenBSD: clientloop.c,v 1.184 2007/12/28 15:32:24 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. */
1.117 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
1.184 dtucker 460: client_global_keepalive(int type, u_int32_t seq, void *ctxt)
461: {
462: server_alive_timeouts = 0;
463: }
464:
465: static void
1.117 markus 466: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
467: {
468: server_alive_timeouts = 0;
469: client_global_request_reply_fwd(type, seq, ctxt);
470: }
471:
472: static void
473: server_alive_check(void)
474: {
1.176 markus 475: if (++server_alive_timeouts > options.server_alive_count_max) {
476: logit("Timeout, server not responding.");
477: cleanup_exit(255);
478: }
1.117 markus 479: packet_start(SSH2_MSG_GLOBAL_REQUEST);
480: packet_put_cstring("keepalive@openssh.com");
481: packet_put_char(1); /* boolean: want reply */
482: packet_send();
483: }
484:
1.13 markus 485: /*
486: * Waits until the client can do something (some data becomes available on
487: * one of the file descriptors).
488: */
1.77 itojun 489: static void
1.46 markus 490: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 491: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 492: {
1.117 markus 493: struct timeval tv, *tvp;
494: int ret;
495:
1.46 markus 496: /* Add any selections by the channel mechanism. */
1.81 markus 497: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 498:
1.16 markus 499: if (!compat20) {
1.17 markus 500: /* Read from the connection, unless our buffers are full. */
1.16 markus 501: if (buffer_len(&stdout_buffer) < buffer_high &&
502: buffer_len(&stderr_buffer) < buffer_high &&
503: channel_not_very_much_buffered_data())
1.46 markus 504: FD_SET(connection_in, *readsetp);
1.17 markus 505: /*
506: * Read from stdin, unless we have seen EOF or have very much
507: * buffered data to send to the server.
508: */
509: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 510: FD_SET(fileno(stdin), *readsetp);
1.17 markus 511:
512: /* Select stdout/stderr if have data in buffer. */
513: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 514: FD_SET(fileno(stdout), *writesetp);
1.17 markus 515: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 516: FD_SET(fileno(stderr), *writesetp);
1.16 markus 517: } else {
1.71 markus 518: /* channel_prepare_select could have closed the last channel */
1.84 markus 519: if (session_closed && !channel_still_open() &&
520: !packet_have_data_to_write()) {
521: /* clear mask since we did not call select() */
1.87 markus 522: memset(*readsetp, 0, *nallocp);
523: memset(*writesetp, 0, *nallocp);
1.84 markus 524: return;
1.71 markus 525: } else {
526: FD_SET(connection_in, *readsetp);
527: }
1.16 markus 528: }
1.11 markus 529:
530: /* Select server connection if have data to write to the server. */
531: if (packet_have_data_to_write())
1.46 markus 532: FD_SET(connection_out, *writesetp);
1.11 markus 533:
1.123 djm 534: if (control_fd != -1)
535: FD_SET(control_fd, *readsetp);
536:
1.13 markus 537: /*
538: * Wait for something to happen. This will suspend the process until
539: * some selected descriptor can be read, written, or has some other
1.117 markus 540: * event pending.
1.13 markus 541: */
1.11 markus 542:
1.117 markus 543: if (options.server_alive_interval == 0 || !compat20)
544: tvp = NULL;
1.129 deraadt 545: else {
1.117 markus 546: tv.tv_sec = options.server_alive_interval;
547: tv.tv_usec = 0;
548: tvp = &tv;
549: }
550: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
551: if (ret < 0) {
1.11 markus 552: char buf[100];
1.51 markus 553:
554: /*
555: * We have to clear the select masks, because we return.
556: * We have to return, because the mainloop checks for the flags
557: * set by the signal handlers.
558: */
1.87 markus 559: memset(*readsetp, 0, *nallocp);
560: memset(*writesetp, 0, *nallocp);
1.50 deraadt 561:
1.11 markus 562: if (errno == EINTR)
563: return;
564: /* Note: we might still have data in the buffers. */
565: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
566: buffer_append(&stderr_buffer, buf, strlen(buf));
567: quit_pending = 1;
1.117 markus 568: } else if (ret == 0)
569: server_alive_check();
1.11 markus 570: }
571:
1.77 itojun 572: static void
1.31 markus 573: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 574: {
1.11 markus 575: /* Flush stdout and stderr buffers. */
1.31 markus 576: if (buffer_len(bout) > 0)
1.112 deraadt 577: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 578: if (buffer_len(berr) > 0)
1.112 deraadt 579: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 580:
581: leave_raw_mode();
582:
1.13 markus 583: /*
584: * Free (and clear) the buffer to reduce the amount of data that gets
585: * written to swap.
586: */
1.31 markus 587: buffer_free(bin);
588: buffer_free(bout);
589: buffer_free(berr);
1.11 markus 590:
591: /* Send the suspend signal to the program itself. */
592: kill(getpid(), SIGTSTP);
593:
1.132 djm 594: /* Reset window sizes in case they have changed */
595: received_window_change_signal = 1;
1.11 markus 596:
597: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 598: buffer_init(bin);
599: buffer_init(bout);
600: buffer_init(berr);
1.11 markus 601:
602: enter_raw_mode();
603: }
604:
1.77 itojun 605: static void
1.161 deraadt 606: client_process_net_input(fd_set *readset)
1.11 markus 607: {
1.17 markus 608: int len;
609: char buf[8192];
1.11 markus 610:
1.13 markus 611: /*
612: * Read input from the server, and add any such data to the buffer of
613: * the packet subsystem.
614: */
1.11 markus 615: if (FD_ISSET(connection_in, readset)) {
616: /* Read as much as possible. */
617: len = read(connection_in, buf, sizeof(buf));
618: if (len == 0) {
619: /* Received EOF. The remote host has closed the connection. */
620: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
621: host);
1.1 deraadt 622: buffer_append(&stderr_buffer, buf, strlen(buf));
623: quit_pending = 1;
624: return;
1.11 markus 625: }
1.13 markus 626: /*
627: * There is a kernel bug on Solaris that causes select to
628: * sometimes wake up even though there is no data available.
629: */
1.53 millert 630: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 631: len = 0;
632:
633: if (len < 0) {
634: /* An error has encountered. Perhaps there is a network problem. */
635: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
636: host, strerror(errno));
637: buffer_append(&stderr_buffer, buf, strlen(buf));
638: quit_pending = 1;
639: return;
640: }
641: packet_process_incoming(buf, len);
642: }
1.17 markus 643: }
1.16 markus 644:
1.97 jakob 645: static void
1.123 djm 646: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
647: {
648: int id;
649: Channel *c;
1.129 deraadt 650:
1.123 djm 651: id = packet_get_int();
652: packet_check_eom();
653:
654: if ((c = channel_lookup(id)) == NULL) {
655: error("%s: no channel for id %d", __func__, id);
656: return;
657: }
658:
659: if (type == SSH2_MSG_CHANNEL_SUCCESS)
660: debug2("Request suceeded on channel %d", id);
661: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
662: error("Request failed on channel %d", id);
663: channel_free(c);
664: }
665: }
666:
667: static void
668: client_extra_session2_setup(int id, void *arg)
669: {
670: struct confirm_ctx *cctx = arg;
1.140 djm 671: const char *display;
1.123 djm 672: Channel *c;
1.126 djm 673: int i;
1.129 deraadt 674:
1.123 djm 675: if (cctx == NULL)
676: fatal("%s: cctx == NULL", __func__);
677: if ((c = channel_lookup(id)) == NULL)
678: fatal("%s: no channel for id %d", __func__, id);
679:
1.141 djm 680: display = getenv("DISPLAY");
1.140 djm 681: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
682: char *proto, *data;
683: /* Get reasonable local authentication information. */
684: client_x11_get_proto(display, options.xauth_location,
685: options.forward_x11_trusted, &proto, &data);
686: /* Request forwarding with authentication spoofing. */
687: debug("Requesting X11 forwarding with authentication spoofing.");
688: x11_request_forwarding_with_spoofing(id, display, proto, data);
689: /* XXX wait for reply */
690: }
691:
692: if (cctx->want_agent_fwd && options.forward_agent) {
693: debug("Requesting authentication agent forwarding.");
694: channel_request_start(id, "auth-agent-req@openssh.com", 0);
695: packet_send();
696: }
697:
1.129 deraadt 698: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 699: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 700: client_subsystem_reply);
1.127 djm 701:
1.123 djm 702: c->confirm_ctx = NULL;
703: buffer_free(&cctx->cmd);
1.126 djm 704: xfree(cctx->term);
705: if (cctx->env != NULL) {
706: for (i = 0; cctx->env[i] != NULL; i++)
707: xfree(cctx->env[i]);
708: xfree(cctx->env);
1.129 deraadt 709: }
1.126 djm 710: xfree(cctx);
1.123 djm 711: }
712:
713: static void
1.161 deraadt 714: client_process_control(fd_set *readset)
1.123 djm 715: {
716: Buffer m;
717: Channel *c;
1.178 djm 718: int client_fd, new_fd[3], ver, allowed, window, packetmax;
1.123 djm 719: socklen_t addrlen;
720: struct sockaddr_storage addr;
721: struct confirm_ctx *cctx;
722: char *cmd;
1.182 djm 723: u_int i, j, len, env_len, command, flags;
1.123 djm 724: uid_t euid;
725: gid_t egid;
726:
727: /*
728: * Accept connection on control socket
729: */
730: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
731: return;
732:
733: memset(&addr, 0, sizeof(addr));
734: addrlen = sizeof(addr);
735: if ((client_fd = accept(control_fd,
736: (struct sockaddr*)&addr, &addrlen)) == -1) {
737: error("%s accept: %s", __func__, strerror(errno));
738: return;
739: }
740:
741: if (getpeereid(client_fd, &euid, &egid) < 0) {
742: error("%s getpeereid failed: %s", __func__, strerror(errno));
743: close(client_fd);
744: return;
745: }
746: if ((euid != 0) && (getuid() != euid)) {
747: error("control mode uid mismatch: peer euid %u != uid %u",
748: (u_int) euid, (u_int) getuid());
749: close(client_fd);
750: return;
751: }
1.127 djm 752:
1.134 djm 753: unset_nonblock(client_fd);
754:
755: /* Read command */
756: buffer_init(&m);
757: if (ssh_msg_recv(client_fd, &m) == -1) {
758: error("%s: client msg_recv failed", __func__);
759: close(client_fd);
760: buffer_free(&m);
761: return;
762: }
1.140 djm 763: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 764: error("%s: wrong client version %d", __func__, ver);
765: buffer_free(&m);
766: close(client_fd);
767: return;
768: }
769:
1.127 djm 770: allowed = 1;
1.134 djm 771: command = buffer_get_int(&m);
772: flags = buffer_get_int(&m);
1.123 djm 773:
1.134 djm 774: buffer_clear(&m);
1.123 djm 775:
1.134 djm 776: switch (command) {
777: case SSHMUX_COMMAND_OPEN:
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("Allow shared connection "
781: "to %s? ", host);
782: /* continue below */
783: break;
784: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 785: if (options.control_master == SSHCTL_MASTER_ASK ||
786: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 787: allowed = ask_permission("Terminate shared connection "
788: "to %s? ", host);
789: if (allowed)
790: quit_pending = 1;
1.136 deraadt 791: /* FALLTHROUGH */
1.134 djm 792: case SSHMUX_COMMAND_ALIVE_CHECK:
793: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
794: buffer_clear(&m);
795: buffer_put_int(&m, allowed);
796: buffer_put_int(&m, getpid());
1.140 djm 797: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 798: error("%s: client msg_send failed", __func__);
799: close(client_fd);
800: buffer_free(&m);
801: return;
802: }
803: buffer_free(&m);
804: close(client_fd);
805: return;
806: default:
807: error("Unsupported command %d", command);
808: buffer_free(&m);
809: close(client_fd);
810: return;
811: }
1.123 djm 812:
1.134 djm 813: /* Reply for SSHMUX_COMMAND_OPEN */
814: buffer_clear(&m);
1.127 djm 815: buffer_put_int(&m, allowed);
1.123 djm 816: buffer_put_int(&m, getpid());
1.140 djm 817: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 818: error("%s: client msg_send failed", __func__);
819: close(client_fd);
1.127 djm 820: buffer_free(&m);
1.123 djm 821: return;
822: }
823:
1.127 djm 824: if (!allowed) {
825: error("Refused control connection");
826: close(client_fd);
827: buffer_free(&m);
828: return;
829: }
830:
1.134 djm 831: buffer_clear(&m);
1.123 djm 832: if (ssh_msg_recv(client_fd, &m) == -1) {
833: error("%s: client msg_recv failed", __func__);
834: close(client_fd);
1.127 djm 835: buffer_free(&m);
1.123 djm 836: return;
837: }
1.140 djm 838: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 839: error("%s: wrong client version %d", __func__, ver);
840: buffer_free(&m);
841: close(client_fd);
842: return;
843: }
844:
1.159 djm 845: cctx = xcalloc(1, sizeof(*cctx));
1.134 djm 846: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
847: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 848: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
849: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 850: cctx->term = buffer_get_string(&m, &len);
851:
852: cmd = buffer_get_string(&m, &len);
853: buffer_init(&cctx->cmd);
854: buffer_append(&cctx->cmd, cmd, strlen(cmd));
855:
1.126 djm 856: env_len = buffer_get_int(&m);
857: env_len = MIN(env_len, 4096);
858: debug3("%s: receiving %d env vars", __func__, env_len);
859: if (env_len != 0) {
1.159 djm 860: cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
1.126 djm 861: for (i = 0; i < env_len; i++)
862: cctx->env[i] = buffer_get_string(&m, &len);
863: cctx->env[i] = NULL;
864: }
865:
1.123 djm 866: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
867: cctx->want_tty, cctx->want_subsys, cmd);
1.163 markus 868: xfree(cmd);
1.123 djm 869:
870: /* Gather fds from client */
1.182 djm 871: for(i = 0; i < 3; i++) {
872: if ((new_fd[i] = mm_receive_fd(client_fd)) == -1) {
873: error("%s: failed to receive fd %d from slave",
874: __func__, i);
875: for (j = 0; j < i; j++)
876: close(new_fd[j]);
877: for (j = 0; j < env_len; j++)
878: xfree(cctx->env[j]);
879: if (env_len > 0)
880: xfree(cctx->env);
881: xfree(cctx->term);
882: buffer_free(&cctx->cmd);
883: xfree(cctx);
884: return;
885: }
886: }
1.123 djm 887:
888: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
889: new_fd[0], new_fd[1], new_fd[2]);
890:
891: /* Try to pick up ttymodes from client before it goes raw */
892: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
893: error("%s: tcgetattr: %s", __func__, strerror(errno));
894:
1.134 djm 895: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 896: buffer_clear(&m);
1.140 djm 897: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 898: error("%s: client msg_send failed", __func__);
899: close(client_fd);
900: close(new_fd[0]);
901: close(new_fd[1]);
902: close(new_fd[2]);
1.127 djm 903: buffer_free(&m);
1.134 djm 904: xfree(cctx->term);
905: if (env_len != 0) {
906: for (i = 0; i < env_len; i++)
907: xfree(cctx->env[i]);
908: xfree(cctx->env);
909: }
1.123 djm 910: return;
911: }
912: buffer_free(&m);
913:
914: /* enable nonblocking unless tty */
915: if (!isatty(new_fd[0]))
916: set_nonblock(new_fd[0]);
917: if (!isatty(new_fd[1]))
918: set_nonblock(new_fd[1]);
919: if (!isatty(new_fd[2]))
920: set_nonblock(new_fd[2]);
921:
922: set_nonblock(client_fd);
923:
1.178 djm 924: window = CHAN_SES_WINDOW_DEFAULT;
925: packetmax = CHAN_SES_PACKET_DEFAULT;
926: if (cctx->want_tty) {
927: window >>= 1;
928: packetmax >>= 1;
929: }
930:
1.129 deraadt 931: c = channel_new("session", SSH_CHANNEL_OPENING,
1.178 djm 932: new_fd[0], new_fd[1], new_fd[2], window, packetmax,
1.123 djm 933: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
934:
935: /* XXX */
936: c->ctl_fd = client_fd;
937:
938: debug3("%s: channel_new: %d", __func__, c->self);
939:
940: channel_send_open(c->self);
941: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
942: }
943:
944: static void
1.99 markus 945: process_cmdline(void)
1.97 jakob 946: {
947: void (*handler)(int);
1.135 djm 948: char *s, *cmd, *cancel_host;
1.121 djm 949: int delete = 0;
1.97 jakob 950: int local = 0;
1.135 djm 951: u_short cancel_port;
952: Forward fwd;
1.97 jakob 953:
1.183 djm 954: bzero(&fwd, sizeof(fwd));
955: fwd.listen_host = fwd.connect_host = NULL;
956:
1.97 jakob 957: leave_raw_mode();
1.101 markus 958: handler = signal(SIGINT, SIG_IGN);
1.99 markus 959: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 960: if (s == NULL)
961: goto out;
1.179 tedu 962: while (isspace(*s))
1.97 jakob 963: s++;
1.121 djm 964: if (*s == '-')
965: s++; /* Skip cmdline '-', if any */
1.120 dtucker 966: if (*s == '\0')
1.97 jakob 967: goto out;
1.121 djm 968:
1.122 djm 969: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 970: logit("Commands:");
1.164 djm 971: logit(" -L[bind_address:]port:host:hostport "
972: "Request local forward");
973: logit(" -R[bind_address:]port:host:hostport "
974: "Request remote forward");
1.165 stevesk 975: logit(" -KR[bind_address:]port "
1.164 djm 976: "Cancel remote forward");
1.146 reyk 977: if (!options.permit_local_command)
978: goto out;
1.164 djm 979: logit(" !args "
980: "Execute local command");
1.146 reyk 981: goto out;
982: }
983:
984: if (*s == '!' && options.permit_local_command) {
985: s++;
986: ssh_local_cmd(s);
1.121 djm 987: goto out;
988: }
989:
990: if (*s == 'K') {
991: delete = 1;
992: s++;
993: }
994: if (*s != 'L' && *s != 'R') {
1.109 itojun 995: logit("Invalid command.");
1.97 jakob 996: goto out;
997: }
1.121 djm 998: if (*s == 'L')
1.97 jakob 999: local = 1;
1.121 djm 1000: if (local && delete) {
1001: logit("Not supported.");
1002: goto out;
1003: }
1004: if ((!local || delete) && !compat20) {
1.109 itojun 1005: logit("Not supported for SSH protocol version 1.");
1.97 jakob 1006: goto out;
1007: }
1.121 djm 1008:
1.179 tedu 1009: while (isspace(*++s))
1010: ;
1.97 jakob 1011:
1.121 djm 1012: if (delete) {
1.135 djm 1013: cancel_port = 0;
1014: cancel_host = hpdelim(&s); /* may be NULL */
1015: if (s != NULL) {
1016: cancel_port = a2port(s);
1017: cancel_host = cleanhostname(cancel_host);
1018: } else {
1019: cancel_port = a2port(cancel_host);
1020: cancel_host = NULL;
1.121 djm 1021: }
1.135 djm 1022: if (cancel_port == 0) {
1023: logit("Bad forwarding close port");
1.121 djm 1024: goto out;
1025: }
1.135 djm 1026: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 1027: } else {
1.135 djm 1028: if (!parse_forward(&fwd, s)) {
1.121 djm 1029: logit("Bad forwarding specification.");
1030: goto out;
1031: }
1032: if (local) {
1.135 djm 1033: if (channel_setup_local_fwd_listener(fwd.listen_host,
1034: fwd.listen_port, fwd.connect_host,
1035: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 1036: logit("Port forwarding failed.");
1037: goto out;
1038: }
1.135 djm 1039: } else {
1.167 markus 1040: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 1041: fwd.listen_port, fwd.connect_host,
1.167 markus 1042: fwd.connect_port) < 0) {
1043: logit("Port forwarding failed.");
1044: goto out;
1045: }
1.135 djm 1046: }
1047:
1.121 djm 1048: logit("Forwarding port.");
1049: }
1050:
1.97 jakob 1051: out:
1052: signal(SIGINT, handler);
1053: enter_raw_mode();
1054: if (cmd)
1055: xfree(cmd);
1.183 djm 1056: if (fwd.listen_host != NULL)
1057: xfree(fwd.listen_host);
1058: if (fwd.connect_host != NULL)
1059: xfree(fwd.connect_host);
1.97 jakob 1060: }
1061:
1.31 markus 1062: /* process the characters one by one */
1.77 itojun 1063: static int
1.31 markus 1064: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1065: {
1.32 markus 1066: char string[1024];
1.31 markus 1067: pid_t pid;
1068: int bytes = 0;
1.42 markus 1069: u_int i;
1070: u_char ch;
1.31 markus 1071: char *s;
1072:
1.139 djm 1073: if (len <= 0)
1074: return (0);
1075:
1076: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1077: /* Get one character at a time. */
1078: ch = buf[i];
1079:
1080: if (escape_pending) {
1081: /* We have previously seen an escape character. */
1082: /* Clear the flag now. */
1083: escape_pending = 0;
1084:
1085: /* Process the escaped character. */
1086: switch (ch) {
1087: case '.':
1088: /* Terminate the connection. */
1.32 markus 1089: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1090: buffer_append(berr, string, strlen(string));
1.31 markus 1091:
1092: quit_pending = 1;
1093: return -1;
1094:
1095: case 'Z' - 64:
1096: /* Suspend the program. */
1097: /* Print a message to that effect to the user. */
1.32 markus 1098: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1099: buffer_append(berr, string, strlen(string));
1.31 markus 1100:
1101: /* Restore terminal modes and suspend. */
1102: client_suspend_self(bin, bout, berr);
1103:
1104: /* We have been continued. */
1105: continue;
1106:
1.111 markus 1107: case 'B':
1108: if (compat20) {
1109: snprintf(string, sizeof string,
1110: "%cB\r\n", escape_char);
1111: buffer_append(berr, string,
1112: strlen(string));
1113: channel_request_start(session_ident,
1114: "break", 0);
1115: packet_put_int(1000);
1116: packet_send();
1117: }
1118: continue;
1119:
1.54 markus 1120: case 'R':
1.59 markus 1121: if (compat20) {
1122: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1123: logit("Server does not support re-keying");
1.59 markus 1124: else
1125: need_rekeying = 1;
1126: }
1.54 markus 1127: continue;
1128:
1.31 markus 1129: case '&':
1130: /*
1131: * Detach the program (continue to serve connections,
1132: * but put in background and no more new connections).
1133: */
1134: /* Restore tty modes. */
1135: leave_raw_mode();
1136:
1137: /* Stop listening for new connections. */
1.86 markus 1138: channel_stop_listening();
1.31 markus 1139:
1.86 markus 1140: snprintf(string, sizeof string,
1141: "%c& [backgrounded]\n", escape_char);
1142: buffer_append(berr, string, strlen(string));
1.31 markus 1143:
1144: /* Fork into background. */
1145: pid = fork();
1146: if (pid < 0) {
1147: error("fork: %.100s", strerror(errno));
1148: continue;
1149: }
1150: if (pid != 0) { /* This is the parent. */
1151: /* The parent just exits. */
1152: exit(0);
1153: }
1154: /* The child continues serving connections. */
1.86 markus 1155: if (compat20) {
1156: buffer_append(bin, "\004", 1);
1157: /* fake EOF on stdin */
1158: return -1;
1159: } else if (!stdin_eof) {
1160: /*
1161: * Sending SSH_CMSG_EOF alone does not always appear
1162: * to be enough. So we try to send an EOF character
1163: * first.
1164: */
1165: packet_start(SSH_CMSG_STDIN_DATA);
1166: packet_put_string("\004", 1);
1167: packet_send();
1168: /* Close stdin. */
1169: stdin_eof = 1;
1170: if (buffer_len(bin) == 0) {
1171: packet_start(SSH_CMSG_EOF);
1172: packet_send();
1173: }
1174: }
1175: continue;
1.31 markus 1176:
1177: case '?':
1.32 markus 1178: snprintf(string, sizeof string,
1.31 markus 1179: "%c?\r\n\
1180: Supported escape sequences:\r\n\
1.104 stevesk 1181: %c. - terminate connection\r\n\
1.111 markus 1182: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1183: %cC - open a command line\r\n\
1184: %cR - Request rekey (SSH protocol 2 only)\r\n\
1185: %c^Z - suspend ssh\r\n\
1186: %c# - list forwarded connections\r\n\
1187: %c& - background ssh (when waiting for connections to terminate)\r\n\
1188: %c? - this message\r\n\
1189: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1190: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1191: escape_char, escape_char, escape_char, escape_char,
1192: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1193: escape_char, escape_char, escape_char);
1.32 markus 1194: buffer_append(berr, string, strlen(string));
1.31 markus 1195: continue;
1196:
1197: case '#':
1.32 markus 1198: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1199: buffer_append(berr, string, strlen(string));
1.31 markus 1200: s = channel_open_message();
1201: buffer_append(berr, s, strlen(s));
1202: xfree(s);
1.97 jakob 1203: continue;
1204:
1205: case 'C':
1.99 markus 1206: process_cmdline();
1.31 markus 1207: continue;
1208:
1209: default:
1210: if (ch != escape_char) {
1211: buffer_put_char(bin, escape_char);
1212: bytes++;
1213: }
1214: /* Escaped characters fall through here */
1215: break;
1216: }
1217: } else {
1218: /*
1219: * The previous character was not an escape char. Check if this
1220: * is an escape.
1221: */
1222: if (last_was_cr && ch == escape_char) {
1223: /* It is. Set the flag and continue to next character. */
1224: escape_pending = 1;
1225: continue;
1226: }
1227: }
1228:
1229: /*
1230: * Normal character. Record whether it was a newline,
1231: * and append it to the buffer.
1232: */
1233: last_was_cr = (ch == '\r' || ch == '\n');
1234: buffer_put_char(bin, ch);
1235: bytes++;
1236: }
1237: return bytes;
1238: }
1239:
1.77 itojun 1240: static void
1.161 deraadt 1241: client_process_input(fd_set *readset)
1.17 markus 1242: {
1.21 deraadt 1243: int len;
1.31 markus 1244: char buf[8192];
1.16 markus 1245:
1.11 markus 1246: /* Read input from stdin. */
1247: if (FD_ISSET(fileno(stdin), readset)) {
1248: /* Read as much as possible. */
1249: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1250: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1251: return; /* we'll try again later */
1.11 markus 1252: if (len <= 0) {
1.13 markus 1253: /*
1254: * Received EOF or error. They are treated
1255: * similarly, except that an error message is printed
1256: * if it was an error condition.
1257: */
1.11 markus 1258: if (len < 0) {
1259: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1260: buffer_append(&stderr_buffer, buf, strlen(buf));
1261: }
1262: /* Mark that we have seen EOF. */
1263: stdin_eof = 1;
1.13 markus 1264: /*
1265: * Send an EOF message to the server unless there is
1266: * data in the buffer. If there is data in the
1267: * buffer, no message will be sent now. Code
1268: * elsewhere will send the EOF when the buffer
1269: * becomes empty if stdin_eof is set.
1270: */
1.11 markus 1271: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1272: packet_start(SSH_CMSG_EOF);
1273: packet_send();
1.11 markus 1274: }
1.72 stevesk 1275: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1276: /*
1277: * Normal successful read, and no escape character.
1278: * Just append the data to buffer.
1279: */
1.11 markus 1280: buffer_append(&stdin_buffer, buf, len);
1281: } else {
1.13 markus 1282: /*
1283: * Normal, successful read. But we have an escape character
1284: * and have to process the characters one by one.
1285: */
1.52 markus 1286: if (process_escapes(&stdin_buffer, &stdout_buffer,
1287: &stderr_buffer, buf, len) == -1)
1.31 markus 1288: return;
1.11 markus 1289: }
1290: }
1291: }
1292:
1.77 itojun 1293: static void
1.161 deraadt 1294: client_process_output(fd_set *writeset)
1.11 markus 1295: {
1296: int len;
1297: char buf[100];
1.1 deraadt 1298:
1.11 markus 1299: /* Write buffered output to stdout. */
1300: if (FD_ISSET(fileno(stdout), writeset)) {
1301: /* Write as much data as possible. */
1302: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1303: buffer_len(&stdout_buffer));
1.11 markus 1304: if (len <= 0) {
1.64 markus 1305: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1306: len = 0;
1307: else {
1.13 markus 1308: /*
1309: * An error or EOF was encountered. Put an
1310: * error message to stderr buffer.
1311: */
1.11 markus 1312: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1313: buffer_append(&stderr_buffer, buf, strlen(buf));
1314: quit_pending = 1;
1315: return;
1316: }
1317: }
1318: /* Consume printed data from the buffer. */
1319: buffer_consume(&stdout_buffer, len);
1.57 markus 1320: stdout_bytes += len;
1.11 markus 1321: }
1322: /* Write buffered output to stderr. */
1323: if (FD_ISSET(fileno(stderr), writeset)) {
1324: /* Write as much data as possible. */
1325: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1326: buffer_len(&stderr_buffer));
1.11 markus 1327: if (len <= 0) {
1.64 markus 1328: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1329: len = 0;
1330: else {
1.13 markus 1331: /* EOF or error, but can't even print error message. */
1.11 markus 1332: quit_pending = 1;
1333: return;
1334: }
1335: }
1336: /* Consume printed characters from the buffer. */
1337: buffer_consume(&stderr_buffer, len);
1.57 markus 1338: stderr_bytes += len;
1.11 markus 1339: }
1.1 deraadt 1340: }
1341:
1.13 markus 1342: /*
1.15 markus 1343: * Get packets from the connection input buffer, and process them as long as
1344: * there are packets available.
1345: *
1346: * Any unknown packets received during the actual
1347: * session cause the session to terminate. This is
1348: * intended to make debugging easier since no
1349: * confirmations are sent. Any compatible protocol
1350: * extensions must be negotiated during the
1351: * preparatory phase.
1352: */
1353:
1.77 itojun 1354: static void
1.49 itojun 1355: client_process_buffered_input_packets(void)
1.15 markus 1356: {
1.54 markus 1357: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1358: }
1359:
1.31 markus 1360: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1361:
1.77 itojun 1362: static int
1.31 markus 1363: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1364: {
1.31 markus 1365: /* XXX we assume c->extended is writeable */
1366: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1367: }
1368:
1.77 itojun 1369: static void
1.60 markus 1370: client_channel_closed(int id, void *arg)
1371: {
1.83 markus 1372: channel_cancel_cleanup(id);
1.60 markus 1373: session_closed = 1;
1.113 markus 1374: leave_raw_mode();
1.60 markus 1375: }
1376:
1.15 markus 1377: /*
1.13 markus 1378: * Implements the interactive session with the server. This is called after
1379: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1380: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1381: * used as an escape character for terminating or suspending the session.
1.13 markus 1382: */
1.1 deraadt 1383:
1.20 markus 1384: int
1.30 markus 1385: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1386: {
1.46 markus 1387: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1388: double start_time, total_time;
1.130 avsm 1389: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1390: u_int nalloc = 0;
1.11 markus 1391: char buf[100];
1392:
1393: debug("Entering interactive session.");
1394:
1395: start_time = get_current_time();
1396:
1397: /* Initialize variables. */
1398: escape_pending = 0;
1399: last_was_cr = 1;
1400: exit_status = -1;
1401: stdin_eof = 0;
1402: buffer_high = 64 * 1024;
1403: connection_in = packet_get_connection_in();
1404: connection_out = packet_get_connection_out();
1.46 markus 1405: max_fd = MAX(connection_in, connection_out);
1.123 djm 1406: if (control_fd != -1)
1407: max_fd = MAX(max_fd, control_fd);
1.46 markus 1408:
1409: if (!compat20) {
1.63 markus 1410: /* enable nonblocking unless tty */
1411: if (!isatty(fileno(stdin)))
1412: set_nonblock(fileno(stdin));
1413: if (!isatty(fileno(stdout)))
1414: set_nonblock(fileno(stdout));
1415: if (!isatty(fileno(stderr)))
1416: set_nonblock(fileno(stderr));
1.46 markus 1417: max_fd = MAX(max_fd, fileno(stdin));
1418: max_fd = MAX(max_fd, fileno(stdout));
1419: max_fd = MAX(max_fd, fileno(stderr));
1420: }
1.11 markus 1421: stdin_bytes = 0;
1422: stdout_bytes = 0;
1423: stderr_bytes = 0;
1424: quit_pending = 0;
1425: escape_char = escape_char_arg;
1426:
1427: /* Initialize buffers. */
1428: buffer_init(&stdin_buffer);
1429: buffer_init(&stdout_buffer);
1430: buffer_init(&stderr_buffer);
1431:
1.15 markus 1432: client_init_dispatch();
1433:
1.105 markus 1434: /*
1435: * Set signal handlers, (e.g. to restore non-blocking mode)
1436: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1437: */
1.131 djm 1438: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1439: signal(SIGHUP, signal_handler);
1.105 markus 1440: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1441: signal(SIGINT, signal_handler);
1442: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1443: signal(SIGQUIT, signal_handler);
1444: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1445: signal(SIGTERM, signal_handler);
1.132 djm 1446: signal(SIGWINCH, window_change_handler);
1.11 markus 1447:
1448: if (have_pty)
1449: enter_raw_mode();
1450:
1.48 markus 1451: if (compat20) {
1452: session_ident = ssh2_chan_id;
1.72 stevesk 1453: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1454: channel_register_filter(session_ident,
1.149 reyk 1455: simple_escape_filter, NULL);
1.60 markus 1456: if (session_ident != -1)
1457: channel_register_cleanup(session_ident,
1.143 djm 1458: client_channel_closed, 0);
1.48 markus 1459: } else {
1460: /* Check if we should immediately send eof on stdin. */
1.16 markus 1461: client_check_initial_eof_on_stdin();
1.48 markus 1462: }
1.30 markus 1463:
1.11 markus 1464: /* Main loop of the client for the interactive session mode. */
1465: while (!quit_pending) {
1466:
1.13 markus 1467: /* Process buffered packets sent by the server. */
1.11 markus 1468: client_process_buffered_input_packets();
1469:
1.60 markus 1470: if (compat20 && session_closed && !channel_still_open())
1471: break;
1472:
1.56 markus 1473: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1474:
1.56 markus 1475: if (rekeying) {
1476: debug("rekeying in progress");
1477: } else {
1478: /*
1479: * Make packets of buffered stdin data, and buffer
1480: * them for sending to the server.
1481: */
1482: if (!compat20)
1483: client_make_packets_from_stdin_data();
1.11 markus 1484:
1.56 markus 1485: /*
1486: * Make packets from buffered channel data, and
1487: * enqueue them for sending to the server.
1488: */
1489: if (packet_not_very_much_data_to_write())
1490: channel_output_poll();
1.11 markus 1491:
1.56 markus 1492: /*
1493: * Check if the window size has changed, and buffer a
1494: * message about it to the server if so.
1495: */
1496: client_check_window_change();
1.11 markus 1497:
1.56 markus 1498: if (quit_pending)
1499: break;
1500: }
1.13 markus 1501: /*
1502: * Wait until we have something to do (something becomes
1503: * available on one of the descriptors).
1504: */
1.81 markus 1505: max_fd2 = max_fd;
1.56 markus 1506: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1507: &max_fd2, &nalloc, rekeying);
1.11 markus 1508:
1509: if (quit_pending)
1510: break;
1511:
1.56 markus 1512: /* Do channel operations unless rekeying in progress. */
1513: if (!rekeying) {
1514: channel_after_select(readset, writeset);
1.108 markus 1515: if (need_rekeying || packet_need_rekeying()) {
1516: debug("need rekeying");
1.56 markus 1517: xxx_kex->done = 0;
1518: kex_send_kexinit(xxx_kex);
1519: need_rekeying = 0;
1520: }
1521: }
1.11 markus 1522:
1.17 markus 1523: /* Buffer input from the connection. */
1.46 markus 1524: client_process_net_input(readset);
1.17 markus 1525:
1.123 djm 1526: /* Accept control connections. */
1527: client_process_control(readset);
1528:
1.17 markus 1529: if (quit_pending)
1530: break;
1.11 markus 1531:
1.17 markus 1532: if (!compat20) {
1533: /* Buffer data from stdin */
1.46 markus 1534: client_process_input(readset);
1.17 markus 1535: /*
1536: * Process output to stdout and stderr. Output to
1537: * the connection is processed elsewhere (above).
1538: */
1.46 markus 1539: client_process_output(writeset);
1.17 markus 1540: }
1.11 markus 1541:
1.13 markus 1542: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1543: if (FD_ISSET(connection_out, writeset))
1.11 markus 1544: packet_write_poll();
1545: }
1.46 markus 1546: if (readset)
1547: xfree(readset);
1548: if (writeset)
1549: xfree(writeset);
1.11 markus 1550:
1551: /* Terminate the session. */
1552:
1553: /* Stop watching for window change. */
1.132 djm 1554: signal(SIGWINCH, SIG_DFL);
1.11 markus 1555:
1.76 markus 1556: channel_free_all();
1.11 markus 1557:
1.75 markus 1558: if (have_pty)
1559: leave_raw_mode();
1560:
1561: /* restore blocking io */
1562: if (!isatty(fileno(stdin)))
1563: unset_nonblock(fileno(stdin));
1564: if (!isatty(fileno(stdout)))
1565: unset_nonblock(fileno(stdout));
1566: if (!isatty(fileno(stderr)))
1567: unset_nonblock(fileno(stderr));
1.116 dtucker 1568:
1569: /*
1570: * If there was no shell or command requested, there will be no remote
1571: * exit status to be returned. In that case, clear error code if the
1572: * connection was deliberately terminated at this end.
1573: */
1574: if (no_shell_flag && received_signal == SIGTERM) {
1575: received_signal = 0;
1576: exit_status = 0;
1577: }
1.75 markus 1578:
1.113 markus 1579: if (received_signal)
1.89 itojun 1580: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1581:
1.13 markus 1582: /*
1583: * In interactive mode (with pseudo tty) display a message indicating
1584: * that the connection has been closed.
1585: */
1.11 markus 1586: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1587: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1588: buffer_append(&stderr_buffer, buf, strlen(buf));
1589: }
1.70 markus 1590:
1.11 markus 1591: /* Output any buffered data for stdout. */
1.70 markus 1592: while (buffer_len(&stdout_buffer) > 0) {
1593: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1594: buffer_len(&stdout_buffer));
1.70 markus 1595: if (len <= 0) {
1.11 markus 1596: error("Write failed flushing stdout buffer.");
1.70 markus 1597: break;
1598: }
1.11 markus 1599: buffer_consume(&stdout_buffer, len);
1.57 markus 1600: stdout_bytes += len;
1.11 markus 1601: }
1602:
1603: /* Output any buffered data for stderr. */
1.70 markus 1604: while (buffer_len(&stderr_buffer) > 0) {
1605: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1606: buffer_len(&stderr_buffer));
1.70 markus 1607: if (len <= 0) {
1.11 markus 1608: error("Write failed flushing stderr buffer.");
1.70 markus 1609: break;
1610: }
1.11 markus 1611: buffer_consume(&stderr_buffer, len);
1.57 markus 1612: stderr_bytes += len;
1.11 markus 1613: }
1614:
1615: /* Clear and free any buffers. */
1616: memset(buf, 0, sizeof(buf));
1617: buffer_free(&stdin_buffer);
1618: buffer_free(&stdout_buffer);
1619: buffer_free(&stderr_buffer);
1620:
1621: /* Report bytes transferred, and transfer rates. */
1622: total_time = get_current_time() - start_time;
1623: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1624: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1625: if (total_time > 0)
1626: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1627: stdin_bytes / total_time, stdout_bytes / total_time,
1628: stderr_bytes / total_time);
1.11 markus 1629:
1630: /* Return the exit status of the program. */
1631: debug("Exit status %d", exit_status);
1632: return exit_status;
1.15 markus 1633: }
1634:
1635: /*********/
1636:
1.77 itojun 1637: static void
1.94 markus 1638: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1639: {
1.42 markus 1640: u_int data_len;
1.15 markus 1641: char *data = packet_get_string(&data_len);
1.93 markus 1642: packet_check_eom();
1.15 markus 1643: buffer_append(&stdout_buffer, data, data_len);
1644: memset(data, 0, data_len);
1645: xfree(data);
1646: }
1.77 itojun 1647: static void
1.94 markus 1648: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1649: {
1.42 markus 1650: u_int data_len;
1.15 markus 1651: char *data = packet_get_string(&data_len);
1.93 markus 1652: packet_check_eom();
1.15 markus 1653: buffer_append(&stderr_buffer, data, data_len);
1654: memset(data, 0, data_len);
1655: xfree(data);
1656: }
1.77 itojun 1657: static void
1.94 markus 1658: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1659: {
1660: exit_status = packet_get_int();
1.93 markus 1661: packet_check_eom();
1.15 markus 1662: /* Acknowledge the exit. */
1663: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1664: packet_send();
1665: /*
1666: * Must wait for packet to be sent since we are
1667: * exiting the loop.
1668: */
1669: packet_write_wait();
1670: /* Flag that we want to exit. */
1671: quit_pending = 1;
1672: }
1.115 markus 1673: static void
1674: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1675: {
1676: Channel *c = NULL;
1677: int remote_id, sock;
1678:
1679: /* Read the remote channel number from the message. */
1680: remote_id = packet_get_int();
1681: packet_check_eom();
1682:
1683: /*
1684: * Get a connection to the local authentication agent (this may again
1685: * get forwarded).
1686: */
1687: sock = ssh_get_authentication_socket();
1688:
1689: /*
1690: * If we could not connect the agent, send an error message back to
1691: * the server. This should never happen unless the agent dies,
1692: * because authentication forwarding is only enabled if we have an
1693: * agent.
1694: */
1695: if (sock >= 0) {
1696: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1697: -1, 0, 0, 0, "authentication agent connection", 1);
1698: c->remote_id = remote_id;
1699: c->force_drain = 1;
1700: }
1701: if (c == NULL) {
1702: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1703: packet_put_int(remote_id);
1704: } else {
1705: /* Send a confirmation to the remote host. */
1706: debug("Forwarding authentication connection.");
1707: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1708: packet_put_int(remote_id);
1709: packet_put_int(c->self);
1710: }
1711: packet_send();
1712: }
1.15 markus 1713:
1.77 itojun 1714: static Channel *
1.40 markus 1715: client_request_forwarded_tcpip(const char *request_type, int rchan)
1716: {
1.103 deraadt 1717: Channel *c = NULL;
1.40 markus 1718: char *listen_address, *originator_address;
1719: int listen_port, originator_port;
1.67 markus 1720: int sock;
1.40 markus 1721:
1722: /* Get rest of the packet */
1723: listen_address = packet_get_string(NULL);
1724: listen_port = packet_get_int();
1725: originator_address = packet_get_string(NULL);
1726: originator_port = packet_get_int();
1.93 markus 1727: packet_check_eom();
1.40 markus 1728:
1729: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1730: listen_address, listen_port, originator_address, originator_port);
1731:
1.80 stevesk 1732: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1733: if (sock < 0) {
1734: xfree(originator_address);
1735: xfree(listen_address);
1736: return NULL;
1737: }
1738: c = channel_new("forwarded-tcpip",
1739: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1.185 ! dtucker 1740: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1741: originator_address, 1);
1.40 markus 1742: xfree(originator_address);
1743: xfree(listen_address);
1744: return c;
1745: }
1746:
1.103 deraadt 1747: static Channel *
1.40 markus 1748: client_request_x11(const char *request_type, int rchan)
1749: {
1750: Channel *c = NULL;
1751: char *originator;
1752: int originator_port;
1.67 markus 1753: int sock;
1.40 markus 1754:
1755: if (!options.forward_x11) {
1756: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1757: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1758: return NULL;
1759: }
1760: originator = packet_get_string(NULL);
1761: if (datafellows & SSH_BUG_X11FWD) {
1762: debug2("buggy server: x11 request w/o originator_port");
1763: originator_port = 0;
1764: } else {
1765: originator_port = packet_get_int();
1766: }
1.93 markus 1767: packet_check_eom();
1.40 markus 1768: /* XXX check permission */
1.47 markus 1769: debug("client_request_x11: request from %s %d", originator,
1770: originator_port);
1.67 markus 1771: xfree(originator);
1.40 markus 1772: sock = x11_connect_display();
1.67 markus 1773: if (sock < 0)
1774: return NULL;
1775: c = channel_new("x11",
1776: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1777: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1778: c->force_drain = 1;
1.40 markus 1779: return c;
1780: }
1781:
1.103 deraadt 1782: static Channel *
1.40 markus 1783: client_request_agent(const char *request_type, int rchan)
1784: {
1785: Channel *c = NULL;
1.67 markus 1786: int sock;
1.40 markus 1787:
1788: if (!options.forward_agent) {
1789: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1790: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1791: return NULL;
1792: }
1.177 stevesk 1793: sock = ssh_get_authentication_socket();
1.67 markus 1794: if (sock < 0)
1795: return NULL;
1796: c = channel_new("authentication agent connection",
1797: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 ! dtucker 1798: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1799: "authentication agent connection", 1);
1.82 markus 1800: c->force_drain = 1;
1.40 markus 1801: return c;
1.180 djm 1802: }
1803:
1804: int
1805: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1806: {
1807: Channel *c;
1808: int fd;
1809:
1810: if (tun_mode == SSH_TUNMODE_NO)
1811: return 0;
1812:
1813: if (!compat20) {
1814: error("Tunnel forwarding is not support for protocol 1");
1815: return -1;
1816: }
1817:
1818: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1819:
1820: /* Open local tunnel device */
1821: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1822: error("Tunnel device open failed.");
1823: return -1;
1824: }
1825:
1826: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1827: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1828: c->datagram = 1;
1829:
1830: packet_start(SSH2_MSG_CHANNEL_OPEN);
1831: packet_put_cstring("tun@openssh.com");
1832: packet_put_int(c->self);
1833: packet_put_int(c->local_window_max);
1834: packet_put_int(c->local_maxpacket);
1835: packet_put_int(tun_mode);
1836: packet_put_int(remote_tun);
1837: packet_send();
1838:
1839: return 0;
1.40 markus 1840: }
1841:
1.22 markus 1842: /* XXXX move to generic input handler */
1.77 itojun 1843: static void
1.94 markus 1844: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1845: {
1846: Channel *c = NULL;
1847: char *ctype;
1848: int rchan;
1.102 markus 1849: u_int rmaxpack, rwindow, len;
1.22 markus 1850:
1851: ctype = packet_get_string(&len);
1852: rchan = packet_get_int();
1853: rwindow = packet_get_int();
1854: rmaxpack = packet_get_int();
1855:
1.24 markus 1856: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1857: ctype, rchan, rwindow, rmaxpack);
1858:
1.40 markus 1859: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1860: c = client_request_forwarded_tcpip(ctype, rchan);
1861: } else if (strcmp(ctype, "x11") == 0) {
1862: c = client_request_x11(ctype, rchan);
1863: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1864: c = client_request_agent(ctype, rchan);
1.22 markus 1865: }
1866: /* XXX duplicate : */
1867: if (c != NULL) {
1868: debug("confirm %s", ctype);
1869: c->remote_id = rchan;
1870: c->remote_window = rwindow;
1871: c->remote_maxpacket = rmaxpack;
1.69 markus 1872: if (c->type != SSH_CHANNEL_CONNECTING) {
1873: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1874: packet_put_int(c->remote_id);
1875: packet_put_int(c->self);
1876: packet_put_int(c->local_window);
1877: packet_put_int(c->local_maxpacket);
1878: packet_send();
1879: }
1.22 markus 1880: } else {
1881: debug("failure %s", ctype);
1882: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1883: packet_put_int(rchan);
1884: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1885: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1886: packet_put_cstring("open failed");
1.66 markus 1887: packet_put_cstring("");
1888: }
1.22 markus 1889: packet_send();
1890: }
1891: xfree(ctype);
1892: }
1.77 itojun 1893: static void
1.94 markus 1894: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1895: {
1896: Channel *c = NULL;
1.123 djm 1897: int exitval, id, reply, success = 0;
1.48 markus 1898: char *rtype;
1899:
1900: id = packet_get_int();
1901: rtype = packet_get_string(NULL);
1902: reply = packet_get_char();
1903:
1904: debug("client_input_channel_req: channel %d rtype %s reply %d",
1905: id, rtype, reply);
1906:
1.128 djm 1907: if (id == -1) {
1908: error("client_input_channel_req: request for channel -1");
1909: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1910: error("client_input_channel_req: channel %d: unknown channel", id);
1911: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1912: exitval = packet_get_int();
1913: if (id == session_ident) {
1914: success = 1;
1915: exit_status = exitval;
1916: } else if (c->ctl_fd == -1) {
1917: error("client_input_channel_req: unexpected channel %d",
1918: session_ident);
1919: } else {
1920: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1921: success = 1;
1922: }
1.93 markus 1923: packet_check_eom();
1.48 markus 1924: }
1925: if (reply) {
1926: packet_start(success ?
1927: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1928: packet_put_int(id);
1.48 markus 1929: packet_send();
1930: }
1931: xfree(rtype);
1932: }
1.95 markus 1933: static void
1934: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1935: {
1936: char *rtype;
1937: int want_reply;
1938: int success = 0;
1939:
1940: rtype = packet_get_string(NULL);
1941: want_reply = packet_get_char();
1.117 markus 1942: debug("client_input_global_request: rtype %s want_reply %d",
1943: rtype, want_reply);
1.95 markus 1944: if (want_reply) {
1945: packet_start(success ?
1946: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1947: packet_send();
1948: packet_write_wait();
1949: }
1950: xfree(rtype);
1951: }
1.22 markus 1952:
1.123 djm 1953: void
1.129 deraadt 1954: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1955: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1956: dispatch_fn *subsys_repl)
1957: {
1958: int len;
1.132 djm 1959: Channel *c = NULL;
1.123 djm 1960:
1961: debug2("%s: id %d", __func__, id);
1962:
1.132 djm 1963: if ((c = channel_lookup(id)) == NULL)
1964: fatal("client_session2_setup: channel %d: unknown channel", id);
1965:
1.123 djm 1966: if (want_tty) {
1967: struct winsize ws;
1968: struct termios tio;
1969:
1970: /* Store window size in the packet. */
1971: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1972: memset(&ws, 0, sizeof(ws));
1973:
1974: channel_request_start(id, "pty-req", 0);
1975: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1976: packet_put_int((u_int)ws.ws_col);
1977: packet_put_int((u_int)ws.ws_row);
1978: packet_put_int((u_int)ws.ws_xpixel);
1979: packet_put_int((u_int)ws.ws_ypixel);
1.123 djm 1980: tio = get_saved_tio();
1981: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1982: packet_send();
1983: /* XXX wait for reply */
1.132 djm 1984: c->client_tty = 1;
1.123 djm 1985: }
1986:
1987: /* Transfer any environment variables from client to server */
1.126 djm 1988: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1989: int i, j, matched;
1990: char *name, *val;
1991:
1992: debug("Sending environment.");
1.126 djm 1993: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1994: /* Split */
1.126 djm 1995: name = xstrdup(env[i]);
1.123 djm 1996: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1997: xfree(name);
1.123 djm 1998: continue;
1999: }
2000: *val++ = '\0';
2001:
2002: matched = 0;
2003: for (j = 0; j < options.num_send_env; j++) {
2004: if (match_pattern(name, options.send_env[j])) {
2005: matched = 1;
2006: break;
2007: }
2008: }
2009: if (!matched) {
2010: debug3("Ignored env %s", name);
1.144 stevesk 2011: xfree(name);
1.123 djm 2012: continue;
2013: }
2014:
2015: debug("Sending env %s = %s", name, val);
2016: channel_request_start(id, "env", 0);
2017: packet_put_cstring(name);
2018: packet_put_cstring(val);
2019: packet_send();
1.144 stevesk 2020: xfree(name);
1.123 djm 2021: }
2022: }
2023:
2024: len = buffer_len(cmd);
2025: if (len > 0) {
2026: if (len > 900)
2027: len = 900;
2028: if (want_subsystem) {
2029: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
2030: channel_request_start(id, "subsystem", subsys_repl != NULL);
2031: if (subsys_repl != NULL) {
2032: /* register callback for reply */
2033: /* XXX we assume that client_loop has already been called */
2034: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
2035: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
2036: }
2037: } else {
2038: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
2039: channel_request_start(id, "exec", 0);
2040: }
2041: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2042: packet_send();
2043: } else {
2044: channel_request_start(id, "shell", 0);
2045: packet_send();
2046: }
2047: }
2048:
1.77 itojun 2049: static void
1.49 itojun 2050: client_init_dispatch_20(void)
1.16 markus 2051: {
1.55 markus 2052: dispatch_init(&dispatch_protocol_error);
1.100 markus 2053:
1.16 markus 2054: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2055: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2056: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2057: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2058: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2059: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2060: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2061: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2062: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 2063: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2064:
2065: /* rekeying */
2066: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2067:
2068: /* global request reply messages */
2069: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2070: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.184 dtucker 2071: dispatch_set(SSH2_MSG_IGNORE, &client_global_keepalive);
2072: dispatch_set(SSH2_MSG_UNIMPLEMENTED, &client_global_keepalive);
1.16 markus 2073: }
1.77 itojun 2074: static void
1.49 itojun 2075: client_init_dispatch_13(void)
1.15 markus 2076: {
2077: dispatch_init(NULL);
2078: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2079: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2080: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2081: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2082: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2083: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2084: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2085: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2086: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2087:
2088: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2089: &client_input_agent_open : &deny_input_open);
1.39 markus 2090: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2091: &x11_input_open : &deny_input_open);
1.15 markus 2092: }
1.77 itojun 2093: static void
1.49 itojun 2094: client_init_dispatch_15(void)
1.15 markus 2095: {
2096: client_init_dispatch_13();
2097: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2098: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2099: }
1.79 stevesk 2100: static void
1.49 itojun 2101: client_init_dispatch(void)
1.15 markus 2102: {
1.16 markus 2103: if (compat20)
2104: client_init_dispatch_20();
2105: else if (compat13)
1.15 markus 2106: client_init_dispatch_13();
2107: else
2108: client_init_dispatch_15();
1.113 markus 2109: }
2110:
2111: /* client specific fatal cleanup */
2112: void
1.114 markus 2113: cleanup_exit(int i)
1.113 markus 2114: {
2115: leave_raw_mode();
2116: leave_non_blocking();
1.123 djm 2117: if (options.control_path != NULL && control_fd != -1)
2118: unlink(options.control_path);
1.114 markus 2119: _exit(i);
1.1 deraadt 2120: }