Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.180
1.180 ! djm 1: /* $OpenBSD: clientloop.c,v 1.179 2007/03/20 03:56:12 tedu 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: }
285: snprintf(cmd, sizeof(cmd),
1.142 markus 286: "%s %s%s list %s 2>" _PATH_DEVNULL,
1.138 djm 287: xauth_path,
288: generated ? "-f " : "" ,
289: generated ? xauthfile : "",
290: display);
291: debug2("x11_get_proto: %s", cmd);
292: f = popen(cmd, "r");
293: if (f && fgets(line, sizeof(line), f) &&
294: sscanf(line, "%*s %511s %511s", proto, data) == 2)
295: got_data = 1;
296: if (f)
297: pclose(f);
298: }
299:
300: if (do_unlink) {
301: unlink(xauthfile);
302: rmdir(xauthdir);
303: }
304: if (xauthdir)
305: xfree(xauthdir);
306: if (xauthfile)
307: xfree(xauthfile);
308:
309: /*
310: * If we didn't get authentication data, just make up some
311: * data. The forwarding code will check the validity of the
312: * response anyway, and substitute this data. The X11
313: * server, however, will ignore this fake data and use
314: * whatever authentication mechanisms it was using otherwise
315: * for the local connection.
316: */
317: if (!got_data) {
318: u_int32_t rnd = 0;
319:
320: logit("Warning: No xauth data; "
321: "using fake authentication data for X11 forwarding.");
322: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
323: for (i = 0; i < 16; i++) {
324: if (i % 4 == 0)
325: rnd = arc4random();
326: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
327: rnd & 0xff);
328: rnd >>= 8;
329: }
330: }
1.1 deraadt 331: }
332:
1.13 markus 333: /*
334: * This is called when the interactive is entered. This checks if there is
335: * an EOF coming on stdin. We must check this explicitly, as select() does
336: * not appear to wake up when redirecting from /dev/null.
337: */
1.1 deraadt 338:
1.77 itojun 339: static void
1.49 itojun 340: client_check_initial_eof_on_stdin(void)
1.1 deraadt 341: {
1.11 markus 342: int len;
343: char buf[1];
1.1 deraadt 344:
1.13 markus 345: /*
346: * If standard input is to be "redirected from /dev/null", we simply
347: * mark that we have seen an EOF and send an EOF message to the
348: * server. Otherwise, we try to read a single character; it appears
349: * that for some files, such /dev/null, select() never wakes up for
350: * read for this descriptor, which means that we never get EOF. This
351: * way we will get the EOF if stdin comes from /dev/null or similar.
352: */
1.11 markus 353: if (stdin_null_flag) {
354: /* Fake EOF on stdin. */
355: debug("Sending eof.");
356: stdin_eof = 1;
357: packet_start(SSH_CMSG_EOF);
358: packet_send();
359: } else {
360: enter_non_blocking();
361:
362: /* Check for immediate EOF on stdin. */
363: len = read(fileno(stdin), buf, 1);
364: if (len == 0) {
1.13 markus 365: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 366: debug("Sending eof.");
367: stdin_eof = 1;
368: packet_start(SSH_CMSG_EOF);
369: packet_send();
370: } else if (len > 0) {
1.13 markus 371: /*
372: * Got data. We must store the data in the buffer,
373: * and also process it as an escape character if
374: * appropriate.
375: */
1.42 markus 376: if ((u_char) buf[0] == escape_char)
1.11 markus 377: escape_pending = 1;
1.52 markus 378: else
1.11 markus 379: buffer_append(&stdin_buffer, buf, 1);
380: }
381: leave_non_blocking();
382: }
1.1 deraadt 383: }
384:
385:
1.13 markus 386: /*
387: * Make packets from buffered stdin data, and buffer them for sending to the
388: * connection.
389: */
1.1 deraadt 390:
1.77 itojun 391: static void
1.49 itojun 392: client_make_packets_from_stdin_data(void)
1.1 deraadt 393: {
1.42 markus 394: u_int len;
1.1 deraadt 395:
1.11 markus 396: /* Send buffered stdin data to the server. */
397: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 398: packet_not_very_much_data_to_write()) {
1.11 markus 399: len = buffer_len(&stdin_buffer);
400: /* Keep the packets at reasonable size. */
401: if (len > packet_get_maxsize())
402: len = packet_get_maxsize();
403: packet_start(SSH_CMSG_STDIN_DATA);
404: packet_put_string(buffer_ptr(&stdin_buffer), len);
405: packet_send();
406: buffer_consume(&stdin_buffer, len);
1.52 markus 407: stdin_bytes += len;
1.11 markus 408: /* If we have a pending EOF, send it now. */
409: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
410: packet_start(SSH_CMSG_EOF);
411: packet_send();
412: }
1.1 deraadt 413: }
414: }
415:
1.13 markus 416: /*
417: * Checks if the client window has changed, and sends a packet about it to
418: * the server if so. The actual change is detected elsewhere (by a software
419: * interrupt on Unix); this just checks the flag and sends a message if
420: * appropriate.
421: */
1.1 deraadt 422:
1.77 itojun 423: static void
1.49 itojun 424: client_check_window_change(void)
1.1 deraadt 425: {
1.16 markus 426: struct winsize ws;
427:
428: if (! received_window_change_signal)
429: return;
430: /** XXX race */
431: received_window_change_signal = 0;
432:
1.37 markus 433: debug2("client_check_window_change: changed");
1.16 markus 434:
435: if (compat20) {
1.123 djm 436: channel_send_window_changes();
1.16 markus 437: } else {
1.123 djm 438: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
439: return;
1.16 markus 440: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 441: packet_put_int((u_int)ws.ws_row);
442: packet_put_int((u_int)ws.ws_col);
443: packet_put_int((u_int)ws.ws_xpixel);
444: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 445: packet_send();
1.1 deraadt 446: }
447: }
448:
1.117 markus 449: static void
450: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
451: {
452: server_alive_timeouts = 0;
453: client_global_request_reply_fwd(type, seq, ctxt);
454: }
455:
456: static void
457: server_alive_check(void)
458: {
1.176 markus 459: if (++server_alive_timeouts > options.server_alive_count_max) {
460: logit("Timeout, server not responding.");
461: cleanup_exit(255);
462: }
1.117 markus 463: packet_start(SSH2_MSG_GLOBAL_REQUEST);
464: packet_put_cstring("keepalive@openssh.com");
465: packet_put_char(1); /* boolean: want reply */
466: packet_send();
467: }
468:
1.13 markus 469: /*
470: * Waits until the client can do something (some data becomes available on
471: * one of the file descriptors).
472: */
1.77 itojun 473: static void
1.46 markus 474: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 475: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 476: {
1.117 markus 477: struct timeval tv, *tvp;
478: int ret;
479:
1.46 markus 480: /* Add any selections by the channel mechanism. */
1.81 markus 481: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 482:
1.16 markus 483: if (!compat20) {
1.17 markus 484: /* Read from the connection, unless our buffers are full. */
1.16 markus 485: if (buffer_len(&stdout_buffer) < buffer_high &&
486: buffer_len(&stderr_buffer) < buffer_high &&
487: channel_not_very_much_buffered_data())
1.46 markus 488: FD_SET(connection_in, *readsetp);
1.17 markus 489: /*
490: * Read from stdin, unless we have seen EOF or have very much
491: * buffered data to send to the server.
492: */
493: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 494: FD_SET(fileno(stdin), *readsetp);
1.17 markus 495:
496: /* Select stdout/stderr if have data in buffer. */
497: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 498: FD_SET(fileno(stdout), *writesetp);
1.17 markus 499: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 500: FD_SET(fileno(stderr), *writesetp);
1.16 markus 501: } else {
1.71 markus 502: /* channel_prepare_select could have closed the last channel */
1.84 markus 503: if (session_closed && !channel_still_open() &&
504: !packet_have_data_to_write()) {
505: /* clear mask since we did not call select() */
1.87 markus 506: memset(*readsetp, 0, *nallocp);
507: memset(*writesetp, 0, *nallocp);
1.84 markus 508: return;
1.71 markus 509: } else {
510: FD_SET(connection_in, *readsetp);
511: }
1.16 markus 512: }
1.11 markus 513:
514: /* Select server connection if have data to write to the server. */
515: if (packet_have_data_to_write())
1.46 markus 516: FD_SET(connection_out, *writesetp);
1.11 markus 517:
1.123 djm 518: if (control_fd != -1)
519: FD_SET(control_fd, *readsetp);
520:
1.13 markus 521: /*
522: * Wait for something to happen. This will suspend the process until
523: * some selected descriptor can be read, written, or has some other
1.117 markus 524: * event pending.
1.13 markus 525: */
1.11 markus 526:
1.117 markus 527: if (options.server_alive_interval == 0 || !compat20)
528: tvp = NULL;
1.129 deraadt 529: else {
1.117 markus 530: tv.tv_sec = options.server_alive_interval;
531: tv.tv_usec = 0;
532: tvp = &tv;
533: }
534: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
535: if (ret < 0) {
1.11 markus 536: char buf[100];
1.51 markus 537:
538: /*
539: * We have to clear the select masks, because we return.
540: * We have to return, because the mainloop checks for the flags
541: * set by the signal handlers.
542: */
1.87 markus 543: memset(*readsetp, 0, *nallocp);
544: memset(*writesetp, 0, *nallocp);
1.50 deraadt 545:
1.11 markus 546: if (errno == EINTR)
547: return;
548: /* Note: we might still have data in the buffers. */
549: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
550: buffer_append(&stderr_buffer, buf, strlen(buf));
551: quit_pending = 1;
1.117 markus 552: } else if (ret == 0)
553: server_alive_check();
1.11 markus 554: }
555:
1.77 itojun 556: static void
1.31 markus 557: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 558: {
1.11 markus 559: /* Flush stdout and stderr buffers. */
1.31 markus 560: if (buffer_len(bout) > 0)
1.112 deraadt 561: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 562: if (buffer_len(berr) > 0)
1.112 deraadt 563: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 564:
565: leave_raw_mode();
566:
1.13 markus 567: /*
568: * Free (and clear) the buffer to reduce the amount of data that gets
569: * written to swap.
570: */
1.31 markus 571: buffer_free(bin);
572: buffer_free(bout);
573: buffer_free(berr);
1.11 markus 574:
575: /* Send the suspend signal to the program itself. */
576: kill(getpid(), SIGTSTP);
577:
1.132 djm 578: /* Reset window sizes in case they have changed */
579: received_window_change_signal = 1;
1.11 markus 580:
581: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 582: buffer_init(bin);
583: buffer_init(bout);
584: buffer_init(berr);
1.11 markus 585:
586: enter_raw_mode();
587: }
588:
1.77 itojun 589: static void
1.161 deraadt 590: client_process_net_input(fd_set *readset)
1.11 markus 591: {
1.17 markus 592: int len;
593: char buf[8192];
1.11 markus 594:
1.13 markus 595: /*
596: * Read input from the server, and add any such data to the buffer of
597: * the packet subsystem.
598: */
1.11 markus 599: if (FD_ISSET(connection_in, readset)) {
600: /* Read as much as possible. */
601: len = read(connection_in, buf, sizeof(buf));
602: if (len == 0) {
603: /* Received EOF. The remote host has closed the connection. */
604: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
605: host);
1.1 deraadt 606: buffer_append(&stderr_buffer, buf, strlen(buf));
607: quit_pending = 1;
608: return;
1.11 markus 609: }
1.13 markus 610: /*
611: * There is a kernel bug on Solaris that causes select to
612: * sometimes wake up even though there is no data available.
613: */
1.53 millert 614: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 615: len = 0;
616:
617: if (len < 0) {
618: /* An error has encountered. Perhaps there is a network problem. */
619: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
620: host, strerror(errno));
621: buffer_append(&stderr_buffer, buf, strlen(buf));
622: quit_pending = 1;
623: return;
624: }
625: packet_process_incoming(buf, len);
626: }
1.17 markus 627: }
1.16 markus 628:
1.97 jakob 629: static void
1.123 djm 630: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
631: {
632: int id;
633: Channel *c;
1.129 deraadt 634:
1.123 djm 635: id = packet_get_int();
636: packet_check_eom();
637:
638: if ((c = channel_lookup(id)) == NULL) {
639: error("%s: no channel for id %d", __func__, id);
640: return;
641: }
642:
643: if (type == SSH2_MSG_CHANNEL_SUCCESS)
644: debug2("Request suceeded on channel %d", id);
645: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
646: error("Request failed on channel %d", id);
647: channel_free(c);
648: }
649: }
650:
651: static void
652: client_extra_session2_setup(int id, void *arg)
653: {
654: struct confirm_ctx *cctx = arg;
1.140 djm 655: const char *display;
1.123 djm 656: Channel *c;
1.126 djm 657: int i;
1.129 deraadt 658:
1.123 djm 659: if (cctx == NULL)
660: fatal("%s: cctx == NULL", __func__);
661: if ((c = channel_lookup(id)) == NULL)
662: fatal("%s: no channel for id %d", __func__, id);
663:
1.141 djm 664: display = getenv("DISPLAY");
1.140 djm 665: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
666: char *proto, *data;
667: /* Get reasonable local authentication information. */
668: client_x11_get_proto(display, options.xauth_location,
669: options.forward_x11_trusted, &proto, &data);
670: /* Request forwarding with authentication spoofing. */
671: debug("Requesting X11 forwarding with authentication spoofing.");
672: x11_request_forwarding_with_spoofing(id, display, proto, data);
673: /* XXX wait for reply */
674: }
675:
676: if (cctx->want_agent_fwd && options.forward_agent) {
677: debug("Requesting authentication agent forwarding.");
678: channel_request_start(id, "auth-agent-req@openssh.com", 0);
679: packet_send();
680: }
681:
1.129 deraadt 682: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 683: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 684: client_subsystem_reply);
1.127 djm 685:
1.123 djm 686: c->confirm_ctx = NULL;
687: buffer_free(&cctx->cmd);
1.126 djm 688: xfree(cctx->term);
689: if (cctx->env != NULL) {
690: for (i = 0; cctx->env[i] != NULL; i++)
691: xfree(cctx->env[i]);
692: xfree(cctx->env);
1.129 deraadt 693: }
1.126 djm 694: xfree(cctx);
1.123 djm 695: }
696:
697: static void
1.161 deraadt 698: client_process_control(fd_set *readset)
1.123 djm 699: {
700: Buffer m;
701: Channel *c;
1.178 djm 702: int client_fd, new_fd[3], ver, allowed, window, packetmax;
1.123 djm 703: socklen_t addrlen;
704: struct sockaddr_storage addr;
705: struct confirm_ctx *cctx;
706: char *cmd;
1.139 djm 707: u_int i, len, env_len, command, flags;
1.123 djm 708: uid_t euid;
709: gid_t egid;
710:
711: /*
712: * Accept connection on control socket
713: */
714: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
715: return;
716:
717: memset(&addr, 0, sizeof(addr));
718: addrlen = sizeof(addr);
719: if ((client_fd = accept(control_fd,
720: (struct sockaddr*)&addr, &addrlen)) == -1) {
721: error("%s accept: %s", __func__, strerror(errno));
722: return;
723: }
724:
725: if (getpeereid(client_fd, &euid, &egid) < 0) {
726: error("%s getpeereid failed: %s", __func__, strerror(errno));
727: close(client_fd);
728: return;
729: }
730: if ((euid != 0) && (getuid() != euid)) {
731: error("control mode uid mismatch: peer euid %u != uid %u",
732: (u_int) euid, (u_int) getuid());
733: close(client_fd);
734: return;
735: }
1.127 djm 736:
1.134 djm 737: unset_nonblock(client_fd);
738:
739: /* Read command */
740: buffer_init(&m);
741: if (ssh_msg_recv(client_fd, &m) == -1) {
742: error("%s: client msg_recv failed", __func__);
743: close(client_fd);
744: buffer_free(&m);
745: return;
746: }
1.140 djm 747: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 748: error("%s: wrong client version %d", __func__, ver);
749: buffer_free(&m);
750: close(client_fd);
751: return;
752: }
753:
1.127 djm 754: allowed = 1;
1.134 djm 755: command = buffer_get_int(&m);
756: flags = buffer_get_int(&m);
1.123 djm 757:
1.134 djm 758: buffer_clear(&m);
1.123 djm 759:
1.134 djm 760: switch (command) {
761: case SSHMUX_COMMAND_OPEN:
1.137 djm 762: if (options.control_master == SSHCTL_MASTER_ASK ||
763: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 764: allowed = ask_permission("Allow shared connection "
765: "to %s? ", host);
766: /* continue below */
767: break;
768: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 769: if (options.control_master == SSHCTL_MASTER_ASK ||
770: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 771: allowed = ask_permission("Terminate shared connection "
772: "to %s? ", host);
773: if (allowed)
774: quit_pending = 1;
1.136 deraadt 775: /* FALLTHROUGH */
1.134 djm 776: case SSHMUX_COMMAND_ALIVE_CHECK:
777: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
778: buffer_clear(&m);
779: buffer_put_int(&m, allowed);
780: buffer_put_int(&m, getpid());
1.140 djm 781: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 782: error("%s: client msg_send failed", __func__);
783: close(client_fd);
784: buffer_free(&m);
785: return;
786: }
787: buffer_free(&m);
788: close(client_fd);
789: return;
790: default:
791: error("Unsupported command %d", command);
792: buffer_free(&m);
793: close(client_fd);
794: return;
795: }
1.123 djm 796:
1.134 djm 797: /* Reply for SSHMUX_COMMAND_OPEN */
798: buffer_clear(&m);
1.127 djm 799: buffer_put_int(&m, allowed);
1.123 djm 800: buffer_put_int(&m, getpid());
1.140 djm 801: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 802: error("%s: client msg_send failed", __func__);
803: close(client_fd);
1.127 djm 804: buffer_free(&m);
1.123 djm 805: return;
806: }
807:
1.127 djm 808: if (!allowed) {
809: error("Refused control connection");
810: close(client_fd);
811: buffer_free(&m);
812: return;
813: }
814:
1.134 djm 815: buffer_clear(&m);
1.123 djm 816: if (ssh_msg_recv(client_fd, &m) == -1) {
817: error("%s: client msg_recv failed", __func__);
818: close(client_fd);
1.127 djm 819: buffer_free(&m);
1.123 djm 820: return;
821: }
1.140 djm 822: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 823: error("%s: wrong client version %d", __func__, ver);
824: buffer_free(&m);
825: close(client_fd);
826: return;
827: }
828:
1.159 djm 829: cctx = xcalloc(1, sizeof(*cctx));
1.134 djm 830: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
831: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 832: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
833: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 834: cctx->term = buffer_get_string(&m, &len);
835:
836: cmd = buffer_get_string(&m, &len);
837: buffer_init(&cctx->cmd);
838: buffer_append(&cctx->cmd, cmd, strlen(cmd));
839:
1.126 djm 840: env_len = buffer_get_int(&m);
841: env_len = MIN(env_len, 4096);
842: debug3("%s: receiving %d env vars", __func__, env_len);
843: if (env_len != 0) {
1.159 djm 844: cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
1.126 djm 845: for (i = 0; i < env_len; i++)
846: cctx->env[i] = buffer_get_string(&m, &len);
847: cctx->env[i] = NULL;
848: }
849:
1.123 djm 850: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
851: cctx->want_tty, cctx->want_subsys, cmd);
1.163 markus 852: xfree(cmd);
1.123 djm 853:
854: /* Gather fds from client */
855: new_fd[0] = mm_receive_fd(client_fd);
856: new_fd[1] = mm_receive_fd(client_fd);
857: new_fd[2] = mm_receive_fd(client_fd);
858:
859: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
860: new_fd[0], new_fd[1], new_fd[2]);
861:
862: /* Try to pick up ttymodes from client before it goes raw */
863: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
864: error("%s: tcgetattr: %s", __func__, strerror(errno));
865:
1.134 djm 866: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 867: buffer_clear(&m);
1.140 djm 868: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 869: error("%s: client msg_send failed", __func__);
870: close(client_fd);
871: close(new_fd[0]);
872: close(new_fd[1]);
873: close(new_fd[2]);
1.127 djm 874: buffer_free(&m);
1.134 djm 875: xfree(cctx->term);
876: if (env_len != 0) {
877: for (i = 0; i < env_len; i++)
878: xfree(cctx->env[i]);
879: xfree(cctx->env);
880: }
1.123 djm 881: return;
882: }
883: buffer_free(&m);
884:
885: /* enable nonblocking unless tty */
886: if (!isatty(new_fd[0]))
887: set_nonblock(new_fd[0]);
888: if (!isatty(new_fd[1]))
889: set_nonblock(new_fd[1]);
890: if (!isatty(new_fd[2]))
891: set_nonblock(new_fd[2]);
892:
893: set_nonblock(client_fd);
894:
1.178 djm 895: window = CHAN_SES_WINDOW_DEFAULT;
896: packetmax = CHAN_SES_PACKET_DEFAULT;
897: if (cctx->want_tty) {
898: window >>= 1;
899: packetmax >>= 1;
900: }
901:
1.129 deraadt 902: c = channel_new("session", SSH_CHANNEL_OPENING,
1.178 djm 903: new_fd[0], new_fd[1], new_fd[2], window, packetmax,
1.123 djm 904: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
905:
906: /* XXX */
907: c->ctl_fd = client_fd;
908:
909: debug3("%s: channel_new: %d", __func__, c->self);
910:
911: channel_send_open(c->self);
912: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
913: }
914:
915: static void
1.99 markus 916: process_cmdline(void)
1.97 jakob 917: {
918: void (*handler)(int);
1.135 djm 919: char *s, *cmd, *cancel_host;
1.121 djm 920: int delete = 0;
1.97 jakob 921: int local = 0;
1.135 djm 922: u_short cancel_port;
923: Forward fwd;
1.97 jakob 924:
925: leave_raw_mode();
1.101 markus 926: handler = signal(SIGINT, SIG_IGN);
1.99 markus 927: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 928: if (s == NULL)
929: goto out;
1.179 tedu 930: while (isspace(*s))
1.97 jakob 931: s++;
1.121 djm 932: if (*s == '-')
933: s++; /* Skip cmdline '-', if any */
1.120 dtucker 934: if (*s == '\0')
1.97 jakob 935: goto out;
1.121 djm 936:
1.122 djm 937: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 938: logit("Commands:");
1.164 djm 939: logit(" -L[bind_address:]port:host:hostport "
940: "Request local forward");
941: logit(" -R[bind_address:]port:host:hostport "
942: "Request remote forward");
1.165 stevesk 943: logit(" -KR[bind_address:]port "
1.164 djm 944: "Cancel remote forward");
1.146 reyk 945: if (!options.permit_local_command)
946: goto out;
1.164 djm 947: logit(" !args "
948: "Execute local command");
1.146 reyk 949: goto out;
950: }
951:
952: if (*s == '!' && options.permit_local_command) {
953: s++;
954: ssh_local_cmd(s);
1.121 djm 955: goto out;
956: }
957:
958: if (*s == 'K') {
959: delete = 1;
960: s++;
961: }
962: if (*s != 'L' && *s != 'R') {
1.109 itojun 963: logit("Invalid command.");
1.97 jakob 964: goto out;
965: }
1.121 djm 966: if (*s == 'L')
1.97 jakob 967: local = 1;
1.121 djm 968: if (local && delete) {
969: logit("Not supported.");
970: goto out;
971: }
972: if ((!local || delete) && !compat20) {
1.109 itojun 973: logit("Not supported for SSH protocol version 1.");
1.97 jakob 974: goto out;
975: }
1.121 djm 976:
1.179 tedu 977: while (isspace(*++s))
978: ;
1.97 jakob 979:
1.121 djm 980: if (delete) {
1.135 djm 981: cancel_port = 0;
982: cancel_host = hpdelim(&s); /* may be NULL */
983: if (s != NULL) {
984: cancel_port = a2port(s);
985: cancel_host = cleanhostname(cancel_host);
986: } else {
987: cancel_port = a2port(cancel_host);
988: cancel_host = NULL;
1.121 djm 989: }
1.135 djm 990: if (cancel_port == 0) {
991: logit("Bad forwarding close port");
1.121 djm 992: goto out;
993: }
1.135 djm 994: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 995: } else {
1.135 djm 996: if (!parse_forward(&fwd, s)) {
1.121 djm 997: logit("Bad forwarding specification.");
998: goto out;
999: }
1000: if (local) {
1.135 djm 1001: if (channel_setup_local_fwd_listener(fwd.listen_host,
1002: fwd.listen_port, fwd.connect_host,
1003: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 1004: logit("Port forwarding failed.");
1005: goto out;
1006: }
1.135 djm 1007: } else {
1.167 markus 1008: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 1009: fwd.listen_port, fwd.connect_host,
1.167 markus 1010: fwd.connect_port) < 0) {
1011: logit("Port forwarding failed.");
1012: goto out;
1013: }
1.135 djm 1014: }
1015:
1.121 djm 1016: logit("Forwarding port.");
1017: }
1018:
1.97 jakob 1019: out:
1020: signal(SIGINT, handler);
1021: enter_raw_mode();
1022: if (cmd)
1023: xfree(cmd);
1024: }
1025:
1.31 markus 1026: /* process the characters one by one */
1.77 itojun 1027: static int
1.31 markus 1028: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1029: {
1.32 markus 1030: char string[1024];
1.31 markus 1031: pid_t pid;
1032: int bytes = 0;
1.42 markus 1033: u_int i;
1034: u_char ch;
1.31 markus 1035: char *s;
1036:
1.139 djm 1037: if (len <= 0)
1038: return (0);
1039:
1040: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1041: /* Get one character at a time. */
1042: ch = buf[i];
1043:
1044: if (escape_pending) {
1045: /* We have previously seen an escape character. */
1046: /* Clear the flag now. */
1047: escape_pending = 0;
1048:
1049: /* Process the escaped character. */
1050: switch (ch) {
1051: case '.':
1052: /* Terminate the connection. */
1.32 markus 1053: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1054: buffer_append(berr, string, strlen(string));
1.31 markus 1055:
1056: quit_pending = 1;
1057: return -1;
1058:
1059: case 'Z' - 64:
1060: /* Suspend the program. */
1061: /* Print a message to that effect to the user. */
1.32 markus 1062: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1063: buffer_append(berr, string, strlen(string));
1.31 markus 1064:
1065: /* Restore terminal modes and suspend. */
1066: client_suspend_self(bin, bout, berr);
1067:
1068: /* We have been continued. */
1069: continue;
1070:
1.111 markus 1071: case 'B':
1072: if (compat20) {
1073: snprintf(string, sizeof string,
1074: "%cB\r\n", escape_char);
1075: buffer_append(berr, string,
1076: strlen(string));
1077: channel_request_start(session_ident,
1078: "break", 0);
1079: packet_put_int(1000);
1080: packet_send();
1081: }
1082: continue;
1083:
1.54 markus 1084: case 'R':
1.59 markus 1085: if (compat20) {
1086: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1087: logit("Server does not support re-keying");
1.59 markus 1088: else
1089: need_rekeying = 1;
1090: }
1.54 markus 1091: continue;
1092:
1.31 markus 1093: case '&':
1094: /*
1095: * Detach the program (continue to serve connections,
1096: * but put in background and no more new connections).
1097: */
1098: /* Restore tty modes. */
1099: leave_raw_mode();
1100:
1101: /* Stop listening for new connections. */
1.86 markus 1102: channel_stop_listening();
1.31 markus 1103:
1.86 markus 1104: snprintf(string, sizeof string,
1105: "%c& [backgrounded]\n", escape_char);
1106: buffer_append(berr, string, strlen(string));
1.31 markus 1107:
1108: /* Fork into background. */
1109: pid = fork();
1110: if (pid < 0) {
1111: error("fork: %.100s", strerror(errno));
1112: continue;
1113: }
1114: if (pid != 0) { /* This is the parent. */
1115: /* The parent just exits. */
1116: exit(0);
1117: }
1118: /* The child continues serving connections. */
1.86 markus 1119: if (compat20) {
1120: buffer_append(bin, "\004", 1);
1121: /* fake EOF on stdin */
1122: return -1;
1123: } else if (!stdin_eof) {
1124: /*
1125: * Sending SSH_CMSG_EOF alone does not always appear
1126: * to be enough. So we try to send an EOF character
1127: * first.
1128: */
1129: packet_start(SSH_CMSG_STDIN_DATA);
1130: packet_put_string("\004", 1);
1131: packet_send();
1132: /* Close stdin. */
1133: stdin_eof = 1;
1134: if (buffer_len(bin) == 0) {
1135: packet_start(SSH_CMSG_EOF);
1136: packet_send();
1137: }
1138: }
1139: continue;
1.31 markus 1140:
1141: case '?':
1.32 markus 1142: snprintf(string, sizeof string,
1.31 markus 1143: "%c?\r\n\
1144: Supported escape sequences:\r\n\
1.104 stevesk 1145: %c. - terminate connection\r\n\
1.111 markus 1146: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1147: %cC - open a command line\r\n\
1148: %cR - Request rekey (SSH protocol 2 only)\r\n\
1149: %c^Z - suspend ssh\r\n\
1150: %c# - list forwarded connections\r\n\
1151: %c& - background ssh (when waiting for connections to terminate)\r\n\
1152: %c? - this message\r\n\
1153: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1154: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1155: escape_char, escape_char, escape_char, escape_char,
1156: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1157: escape_char, escape_char, escape_char);
1.32 markus 1158: buffer_append(berr, string, strlen(string));
1.31 markus 1159: continue;
1160:
1161: case '#':
1.32 markus 1162: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1163: buffer_append(berr, string, strlen(string));
1.31 markus 1164: s = channel_open_message();
1165: buffer_append(berr, s, strlen(s));
1166: xfree(s);
1.97 jakob 1167: continue;
1168:
1169: case 'C':
1.99 markus 1170: process_cmdline();
1.31 markus 1171: continue;
1172:
1173: default:
1174: if (ch != escape_char) {
1175: buffer_put_char(bin, escape_char);
1176: bytes++;
1177: }
1178: /* Escaped characters fall through here */
1179: break;
1180: }
1181: } else {
1182: /*
1183: * The previous character was not an escape char. Check if this
1184: * is an escape.
1185: */
1186: if (last_was_cr && ch == escape_char) {
1187: /* It is. Set the flag and continue to next character. */
1188: escape_pending = 1;
1189: continue;
1190: }
1191: }
1192:
1193: /*
1194: * Normal character. Record whether it was a newline,
1195: * and append it to the buffer.
1196: */
1197: last_was_cr = (ch == '\r' || ch == '\n');
1198: buffer_put_char(bin, ch);
1199: bytes++;
1200: }
1201: return bytes;
1202: }
1203:
1.77 itojun 1204: static void
1.161 deraadt 1205: client_process_input(fd_set *readset)
1.17 markus 1206: {
1.21 deraadt 1207: int len;
1.31 markus 1208: char buf[8192];
1.16 markus 1209:
1.11 markus 1210: /* Read input from stdin. */
1211: if (FD_ISSET(fileno(stdin), readset)) {
1212: /* Read as much as possible. */
1213: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1214: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1215: return; /* we'll try again later */
1.11 markus 1216: if (len <= 0) {
1.13 markus 1217: /*
1218: * Received EOF or error. They are treated
1219: * similarly, except that an error message is printed
1220: * if it was an error condition.
1221: */
1.11 markus 1222: if (len < 0) {
1223: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1224: buffer_append(&stderr_buffer, buf, strlen(buf));
1225: }
1226: /* Mark that we have seen EOF. */
1227: stdin_eof = 1;
1.13 markus 1228: /*
1229: * Send an EOF message to the server unless there is
1230: * data in the buffer. If there is data in the
1231: * buffer, no message will be sent now. Code
1232: * elsewhere will send the EOF when the buffer
1233: * becomes empty if stdin_eof is set.
1234: */
1.11 markus 1235: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1236: packet_start(SSH_CMSG_EOF);
1237: packet_send();
1.11 markus 1238: }
1.72 stevesk 1239: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1240: /*
1241: * Normal successful read, and no escape character.
1242: * Just append the data to buffer.
1243: */
1.11 markus 1244: buffer_append(&stdin_buffer, buf, len);
1245: } else {
1.13 markus 1246: /*
1247: * Normal, successful read. But we have an escape character
1248: * and have to process the characters one by one.
1249: */
1.52 markus 1250: if (process_escapes(&stdin_buffer, &stdout_buffer,
1251: &stderr_buffer, buf, len) == -1)
1.31 markus 1252: return;
1.11 markus 1253: }
1254: }
1255: }
1256:
1.77 itojun 1257: static void
1.161 deraadt 1258: client_process_output(fd_set *writeset)
1.11 markus 1259: {
1260: int len;
1261: char buf[100];
1.1 deraadt 1262:
1.11 markus 1263: /* Write buffered output to stdout. */
1264: if (FD_ISSET(fileno(stdout), writeset)) {
1265: /* Write as much data as possible. */
1266: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1267: buffer_len(&stdout_buffer));
1.11 markus 1268: if (len <= 0) {
1.64 markus 1269: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1270: len = 0;
1271: else {
1.13 markus 1272: /*
1273: * An error or EOF was encountered. Put an
1274: * error message to stderr buffer.
1275: */
1.11 markus 1276: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1277: buffer_append(&stderr_buffer, buf, strlen(buf));
1278: quit_pending = 1;
1279: return;
1280: }
1281: }
1282: /* Consume printed data from the buffer. */
1283: buffer_consume(&stdout_buffer, len);
1.57 markus 1284: stdout_bytes += len;
1.11 markus 1285: }
1286: /* Write buffered output to stderr. */
1287: if (FD_ISSET(fileno(stderr), writeset)) {
1288: /* Write as much data as possible. */
1289: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1290: buffer_len(&stderr_buffer));
1.11 markus 1291: if (len <= 0) {
1.64 markus 1292: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1293: len = 0;
1294: else {
1.13 markus 1295: /* EOF or error, but can't even print error message. */
1.11 markus 1296: quit_pending = 1;
1297: return;
1298: }
1299: }
1300: /* Consume printed characters from the buffer. */
1301: buffer_consume(&stderr_buffer, len);
1.57 markus 1302: stderr_bytes += len;
1.11 markus 1303: }
1.1 deraadt 1304: }
1305:
1.13 markus 1306: /*
1.15 markus 1307: * Get packets from the connection input buffer, and process them as long as
1308: * there are packets available.
1309: *
1310: * Any unknown packets received during the actual
1311: * session cause the session to terminate. This is
1312: * intended to make debugging easier since no
1313: * confirmations are sent. Any compatible protocol
1314: * extensions must be negotiated during the
1315: * preparatory phase.
1316: */
1317:
1.77 itojun 1318: static void
1.49 itojun 1319: client_process_buffered_input_packets(void)
1.15 markus 1320: {
1.54 markus 1321: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1322: }
1323:
1.31 markus 1324: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1325:
1.77 itojun 1326: static int
1.31 markus 1327: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1328: {
1.31 markus 1329: /* XXX we assume c->extended is writeable */
1330: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1331: }
1332:
1.77 itojun 1333: static void
1.60 markus 1334: client_channel_closed(int id, void *arg)
1335: {
1.83 markus 1336: channel_cancel_cleanup(id);
1.60 markus 1337: session_closed = 1;
1.113 markus 1338: leave_raw_mode();
1.60 markus 1339: }
1340:
1.15 markus 1341: /*
1.13 markus 1342: * Implements the interactive session with the server. This is called after
1343: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1344: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1345: * used as an escape character for terminating or suspending the session.
1.13 markus 1346: */
1.1 deraadt 1347:
1.20 markus 1348: int
1.30 markus 1349: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1350: {
1.46 markus 1351: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1352: double start_time, total_time;
1.130 avsm 1353: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1354: u_int nalloc = 0;
1.11 markus 1355: char buf[100];
1356:
1357: debug("Entering interactive session.");
1358:
1359: start_time = get_current_time();
1360:
1361: /* Initialize variables. */
1362: escape_pending = 0;
1363: last_was_cr = 1;
1364: exit_status = -1;
1365: stdin_eof = 0;
1366: buffer_high = 64 * 1024;
1367: connection_in = packet_get_connection_in();
1368: connection_out = packet_get_connection_out();
1.46 markus 1369: max_fd = MAX(connection_in, connection_out);
1.123 djm 1370: if (control_fd != -1)
1371: max_fd = MAX(max_fd, control_fd);
1.46 markus 1372:
1373: if (!compat20) {
1.63 markus 1374: /* enable nonblocking unless tty */
1375: if (!isatty(fileno(stdin)))
1376: set_nonblock(fileno(stdin));
1377: if (!isatty(fileno(stdout)))
1378: set_nonblock(fileno(stdout));
1379: if (!isatty(fileno(stderr)))
1380: set_nonblock(fileno(stderr));
1.46 markus 1381: max_fd = MAX(max_fd, fileno(stdin));
1382: max_fd = MAX(max_fd, fileno(stdout));
1383: max_fd = MAX(max_fd, fileno(stderr));
1384: }
1.11 markus 1385: stdin_bytes = 0;
1386: stdout_bytes = 0;
1387: stderr_bytes = 0;
1388: quit_pending = 0;
1389: escape_char = escape_char_arg;
1390:
1391: /* Initialize buffers. */
1392: buffer_init(&stdin_buffer);
1393: buffer_init(&stdout_buffer);
1394: buffer_init(&stderr_buffer);
1395:
1.15 markus 1396: client_init_dispatch();
1397:
1.105 markus 1398: /*
1399: * Set signal handlers, (e.g. to restore non-blocking mode)
1400: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1401: */
1.131 djm 1402: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1403: signal(SIGHUP, signal_handler);
1.105 markus 1404: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1405: signal(SIGINT, signal_handler);
1406: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1407: signal(SIGQUIT, signal_handler);
1408: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1409: signal(SIGTERM, signal_handler);
1.132 djm 1410: signal(SIGWINCH, window_change_handler);
1.11 markus 1411:
1412: if (have_pty)
1413: enter_raw_mode();
1414:
1.48 markus 1415: if (compat20) {
1416: session_ident = ssh2_chan_id;
1.72 stevesk 1417: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1418: channel_register_filter(session_ident,
1.149 reyk 1419: simple_escape_filter, NULL);
1.60 markus 1420: if (session_ident != -1)
1421: channel_register_cleanup(session_ident,
1.143 djm 1422: client_channel_closed, 0);
1.48 markus 1423: } else {
1424: /* Check if we should immediately send eof on stdin. */
1.16 markus 1425: client_check_initial_eof_on_stdin();
1.48 markus 1426: }
1.30 markus 1427:
1.11 markus 1428: /* Main loop of the client for the interactive session mode. */
1429: while (!quit_pending) {
1430:
1.13 markus 1431: /* Process buffered packets sent by the server. */
1.11 markus 1432: client_process_buffered_input_packets();
1433:
1.60 markus 1434: if (compat20 && session_closed && !channel_still_open())
1435: break;
1436:
1.56 markus 1437: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1438:
1.56 markus 1439: if (rekeying) {
1440: debug("rekeying in progress");
1441: } else {
1442: /*
1443: * Make packets of buffered stdin data, and buffer
1444: * them for sending to the server.
1445: */
1446: if (!compat20)
1447: client_make_packets_from_stdin_data();
1.11 markus 1448:
1.56 markus 1449: /*
1450: * Make packets from buffered channel data, and
1451: * enqueue them for sending to the server.
1452: */
1453: if (packet_not_very_much_data_to_write())
1454: channel_output_poll();
1.11 markus 1455:
1.56 markus 1456: /*
1457: * Check if the window size has changed, and buffer a
1458: * message about it to the server if so.
1459: */
1460: client_check_window_change();
1.11 markus 1461:
1.56 markus 1462: if (quit_pending)
1463: break;
1464: }
1.13 markus 1465: /*
1466: * Wait until we have something to do (something becomes
1467: * available on one of the descriptors).
1468: */
1.81 markus 1469: max_fd2 = max_fd;
1.56 markus 1470: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1471: &max_fd2, &nalloc, rekeying);
1.11 markus 1472:
1473: if (quit_pending)
1474: break;
1475:
1.56 markus 1476: /* Do channel operations unless rekeying in progress. */
1477: if (!rekeying) {
1478: channel_after_select(readset, writeset);
1.108 markus 1479: if (need_rekeying || packet_need_rekeying()) {
1480: debug("need rekeying");
1.56 markus 1481: xxx_kex->done = 0;
1482: kex_send_kexinit(xxx_kex);
1483: need_rekeying = 0;
1484: }
1485: }
1.11 markus 1486:
1.17 markus 1487: /* Buffer input from the connection. */
1.46 markus 1488: client_process_net_input(readset);
1.17 markus 1489:
1.123 djm 1490: /* Accept control connections. */
1491: client_process_control(readset);
1492:
1.17 markus 1493: if (quit_pending)
1494: break;
1.11 markus 1495:
1.17 markus 1496: if (!compat20) {
1497: /* Buffer data from stdin */
1.46 markus 1498: client_process_input(readset);
1.17 markus 1499: /*
1500: * Process output to stdout and stderr. Output to
1501: * the connection is processed elsewhere (above).
1502: */
1.46 markus 1503: client_process_output(writeset);
1.17 markus 1504: }
1.11 markus 1505:
1.13 markus 1506: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1507: if (FD_ISSET(connection_out, writeset))
1.11 markus 1508: packet_write_poll();
1509: }
1.46 markus 1510: if (readset)
1511: xfree(readset);
1512: if (writeset)
1513: xfree(writeset);
1.11 markus 1514:
1515: /* Terminate the session. */
1516:
1517: /* Stop watching for window change. */
1.132 djm 1518: signal(SIGWINCH, SIG_DFL);
1.11 markus 1519:
1.76 markus 1520: channel_free_all();
1.11 markus 1521:
1.75 markus 1522: if (have_pty)
1523: leave_raw_mode();
1524:
1525: /* restore blocking io */
1526: if (!isatty(fileno(stdin)))
1527: unset_nonblock(fileno(stdin));
1528: if (!isatty(fileno(stdout)))
1529: unset_nonblock(fileno(stdout));
1530: if (!isatty(fileno(stderr)))
1531: unset_nonblock(fileno(stderr));
1.116 dtucker 1532:
1533: /*
1534: * If there was no shell or command requested, there will be no remote
1535: * exit status to be returned. In that case, clear error code if the
1536: * connection was deliberately terminated at this end.
1537: */
1538: if (no_shell_flag && received_signal == SIGTERM) {
1539: received_signal = 0;
1540: exit_status = 0;
1541: }
1.75 markus 1542:
1.113 markus 1543: if (received_signal)
1.89 itojun 1544: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1545:
1.13 markus 1546: /*
1547: * In interactive mode (with pseudo tty) display a message indicating
1548: * that the connection has been closed.
1549: */
1.11 markus 1550: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1551: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1552: buffer_append(&stderr_buffer, buf, strlen(buf));
1553: }
1.70 markus 1554:
1.11 markus 1555: /* Output any buffered data for stdout. */
1.70 markus 1556: while (buffer_len(&stdout_buffer) > 0) {
1557: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1558: buffer_len(&stdout_buffer));
1.70 markus 1559: if (len <= 0) {
1.11 markus 1560: error("Write failed flushing stdout buffer.");
1.70 markus 1561: break;
1562: }
1.11 markus 1563: buffer_consume(&stdout_buffer, len);
1.57 markus 1564: stdout_bytes += len;
1.11 markus 1565: }
1566:
1567: /* Output any buffered data for stderr. */
1.70 markus 1568: while (buffer_len(&stderr_buffer) > 0) {
1569: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1570: buffer_len(&stderr_buffer));
1.70 markus 1571: if (len <= 0) {
1.11 markus 1572: error("Write failed flushing stderr buffer.");
1.70 markus 1573: break;
1574: }
1.11 markus 1575: buffer_consume(&stderr_buffer, len);
1.57 markus 1576: stderr_bytes += len;
1.11 markus 1577: }
1578:
1579: /* Clear and free any buffers. */
1580: memset(buf, 0, sizeof(buf));
1581: buffer_free(&stdin_buffer);
1582: buffer_free(&stdout_buffer);
1583: buffer_free(&stderr_buffer);
1584:
1585: /* Report bytes transferred, and transfer rates. */
1586: total_time = get_current_time() - start_time;
1587: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1588: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1589: if (total_time > 0)
1590: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1591: stdin_bytes / total_time, stdout_bytes / total_time,
1592: stderr_bytes / total_time);
1.11 markus 1593:
1594: /* Return the exit status of the program. */
1595: debug("Exit status %d", exit_status);
1596: return exit_status;
1.15 markus 1597: }
1598:
1599: /*********/
1600:
1.77 itojun 1601: static void
1.94 markus 1602: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1603: {
1.42 markus 1604: u_int data_len;
1.15 markus 1605: char *data = packet_get_string(&data_len);
1.93 markus 1606: packet_check_eom();
1.15 markus 1607: buffer_append(&stdout_buffer, data, data_len);
1608: memset(data, 0, data_len);
1609: xfree(data);
1610: }
1.77 itojun 1611: static void
1.94 markus 1612: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1613: {
1.42 markus 1614: u_int data_len;
1.15 markus 1615: char *data = packet_get_string(&data_len);
1.93 markus 1616: packet_check_eom();
1.15 markus 1617: buffer_append(&stderr_buffer, data, data_len);
1618: memset(data, 0, data_len);
1619: xfree(data);
1620: }
1.77 itojun 1621: static void
1.94 markus 1622: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1623: {
1624: exit_status = packet_get_int();
1.93 markus 1625: packet_check_eom();
1.15 markus 1626: /* Acknowledge the exit. */
1627: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1628: packet_send();
1629: /*
1630: * Must wait for packet to be sent since we are
1631: * exiting the loop.
1632: */
1633: packet_write_wait();
1634: /* Flag that we want to exit. */
1635: quit_pending = 1;
1636: }
1.115 markus 1637: static void
1638: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1639: {
1640: Channel *c = NULL;
1641: int remote_id, sock;
1642:
1643: /* Read the remote channel number from the message. */
1644: remote_id = packet_get_int();
1645: packet_check_eom();
1646:
1647: /*
1648: * Get a connection to the local authentication agent (this may again
1649: * get forwarded).
1650: */
1651: sock = ssh_get_authentication_socket();
1652:
1653: /*
1654: * If we could not connect the agent, send an error message back to
1655: * the server. This should never happen unless the agent dies,
1656: * because authentication forwarding is only enabled if we have an
1657: * agent.
1658: */
1659: if (sock >= 0) {
1660: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1661: -1, 0, 0, 0, "authentication agent connection", 1);
1662: c->remote_id = remote_id;
1663: c->force_drain = 1;
1664: }
1665: if (c == NULL) {
1666: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1667: packet_put_int(remote_id);
1668: } else {
1669: /* Send a confirmation to the remote host. */
1670: debug("Forwarding authentication connection.");
1671: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1672: packet_put_int(remote_id);
1673: packet_put_int(c->self);
1674: }
1675: packet_send();
1676: }
1.15 markus 1677:
1.77 itojun 1678: static Channel *
1.40 markus 1679: client_request_forwarded_tcpip(const char *request_type, int rchan)
1680: {
1.103 deraadt 1681: Channel *c = NULL;
1.40 markus 1682: char *listen_address, *originator_address;
1683: int listen_port, originator_port;
1.67 markus 1684: int sock;
1.40 markus 1685:
1686: /* Get rest of the packet */
1687: listen_address = packet_get_string(NULL);
1688: listen_port = packet_get_int();
1689: originator_address = packet_get_string(NULL);
1690: originator_port = packet_get_int();
1.93 markus 1691: packet_check_eom();
1.40 markus 1692:
1693: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1694: listen_address, listen_port, originator_address, originator_port);
1695:
1.80 stevesk 1696: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1697: if (sock < 0) {
1698: xfree(originator_address);
1699: xfree(listen_address);
1700: return NULL;
1701: }
1702: c = channel_new("forwarded-tcpip",
1703: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1704: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1705: originator_address, 1);
1.40 markus 1706: xfree(originator_address);
1707: xfree(listen_address);
1708: return c;
1709: }
1710:
1.103 deraadt 1711: static Channel *
1.40 markus 1712: client_request_x11(const char *request_type, int rchan)
1713: {
1714: Channel *c = NULL;
1715: char *originator;
1716: int originator_port;
1.67 markus 1717: int sock;
1.40 markus 1718:
1719: if (!options.forward_x11) {
1720: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1721: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1722: return NULL;
1723: }
1724: originator = packet_get_string(NULL);
1725: if (datafellows & SSH_BUG_X11FWD) {
1726: debug2("buggy server: x11 request w/o originator_port");
1727: originator_port = 0;
1728: } else {
1729: originator_port = packet_get_int();
1730: }
1.93 markus 1731: packet_check_eom();
1.40 markus 1732: /* XXX check permission */
1.47 markus 1733: debug("client_request_x11: request from %s %d", originator,
1734: originator_port);
1.67 markus 1735: xfree(originator);
1.40 markus 1736: sock = x11_connect_display();
1.67 markus 1737: if (sock < 0)
1738: return NULL;
1739: c = channel_new("x11",
1740: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1741: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1742: c->force_drain = 1;
1.40 markus 1743: return c;
1744: }
1745:
1.103 deraadt 1746: static Channel *
1.40 markus 1747: client_request_agent(const char *request_type, int rchan)
1748: {
1749: Channel *c = NULL;
1.67 markus 1750: int sock;
1.40 markus 1751:
1752: if (!options.forward_agent) {
1753: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1754: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1755: return NULL;
1756: }
1.177 stevesk 1757: sock = ssh_get_authentication_socket();
1.67 markus 1758: if (sock < 0)
1759: return NULL;
1760: c = channel_new("authentication agent connection",
1761: SSH_CHANNEL_OPEN, sock, sock, -1,
1762: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1763: "authentication agent connection", 1);
1.82 markus 1764: c->force_drain = 1;
1.40 markus 1765: return c;
1.180 ! djm 1766: }
! 1767:
! 1768: int
! 1769: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
! 1770: {
! 1771: Channel *c;
! 1772: int fd;
! 1773:
! 1774: if (tun_mode == SSH_TUNMODE_NO)
! 1775: return 0;
! 1776:
! 1777: if (!compat20) {
! 1778: error("Tunnel forwarding is not support for protocol 1");
! 1779: return -1;
! 1780: }
! 1781:
! 1782: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
! 1783:
! 1784: /* Open local tunnel device */
! 1785: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
! 1786: error("Tunnel device open failed.");
! 1787: return -1;
! 1788: }
! 1789:
! 1790: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
! 1791: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
! 1792: c->datagram = 1;
! 1793:
! 1794: packet_start(SSH2_MSG_CHANNEL_OPEN);
! 1795: packet_put_cstring("tun@openssh.com");
! 1796: packet_put_int(c->self);
! 1797: packet_put_int(c->local_window_max);
! 1798: packet_put_int(c->local_maxpacket);
! 1799: packet_put_int(tun_mode);
! 1800: packet_put_int(remote_tun);
! 1801: packet_send();
! 1802:
! 1803: return 0;
1.40 markus 1804: }
1805:
1.22 markus 1806: /* XXXX move to generic input handler */
1.77 itojun 1807: static void
1.94 markus 1808: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1809: {
1810: Channel *c = NULL;
1811: char *ctype;
1812: int rchan;
1.102 markus 1813: u_int rmaxpack, rwindow, len;
1.22 markus 1814:
1815: ctype = packet_get_string(&len);
1816: rchan = packet_get_int();
1817: rwindow = packet_get_int();
1818: rmaxpack = packet_get_int();
1819:
1.24 markus 1820: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1821: ctype, rchan, rwindow, rmaxpack);
1822:
1.40 markus 1823: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1824: c = client_request_forwarded_tcpip(ctype, rchan);
1825: } else if (strcmp(ctype, "x11") == 0) {
1826: c = client_request_x11(ctype, rchan);
1827: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1828: c = client_request_agent(ctype, rchan);
1.22 markus 1829: }
1830: /* XXX duplicate : */
1831: if (c != NULL) {
1832: debug("confirm %s", ctype);
1833: c->remote_id = rchan;
1834: c->remote_window = rwindow;
1835: c->remote_maxpacket = rmaxpack;
1.69 markus 1836: if (c->type != SSH_CHANNEL_CONNECTING) {
1837: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1838: packet_put_int(c->remote_id);
1839: packet_put_int(c->self);
1840: packet_put_int(c->local_window);
1841: packet_put_int(c->local_maxpacket);
1842: packet_send();
1843: }
1.22 markus 1844: } else {
1845: debug("failure %s", ctype);
1846: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1847: packet_put_int(rchan);
1848: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1849: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1850: packet_put_cstring("open failed");
1.66 markus 1851: packet_put_cstring("");
1852: }
1.22 markus 1853: packet_send();
1854: }
1855: xfree(ctype);
1856: }
1.77 itojun 1857: static void
1.94 markus 1858: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1859: {
1860: Channel *c = NULL;
1.123 djm 1861: int exitval, id, reply, success = 0;
1.48 markus 1862: char *rtype;
1863:
1864: id = packet_get_int();
1865: rtype = packet_get_string(NULL);
1866: reply = packet_get_char();
1867:
1868: debug("client_input_channel_req: channel %d rtype %s reply %d",
1869: id, rtype, reply);
1870:
1.128 djm 1871: if (id == -1) {
1872: error("client_input_channel_req: request for channel -1");
1873: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1874: error("client_input_channel_req: channel %d: unknown channel", id);
1875: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1876: exitval = packet_get_int();
1877: if (id == session_ident) {
1878: success = 1;
1879: exit_status = exitval;
1880: } else if (c->ctl_fd == -1) {
1881: error("client_input_channel_req: unexpected channel %d",
1882: session_ident);
1883: } else {
1884: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1885: success = 1;
1886: }
1.93 markus 1887: packet_check_eom();
1.48 markus 1888: }
1889: if (reply) {
1890: packet_start(success ?
1891: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1892: packet_put_int(id);
1.48 markus 1893: packet_send();
1894: }
1895: xfree(rtype);
1896: }
1.95 markus 1897: static void
1898: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1899: {
1900: char *rtype;
1901: int want_reply;
1902: int success = 0;
1903:
1904: rtype = packet_get_string(NULL);
1905: want_reply = packet_get_char();
1.117 markus 1906: debug("client_input_global_request: rtype %s want_reply %d",
1907: rtype, want_reply);
1.95 markus 1908: if (want_reply) {
1909: packet_start(success ?
1910: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1911: packet_send();
1912: packet_write_wait();
1913: }
1914: xfree(rtype);
1915: }
1.22 markus 1916:
1.123 djm 1917: void
1.129 deraadt 1918: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1919: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1920: dispatch_fn *subsys_repl)
1921: {
1922: int len;
1.132 djm 1923: Channel *c = NULL;
1.123 djm 1924:
1925: debug2("%s: id %d", __func__, id);
1926:
1.132 djm 1927: if ((c = channel_lookup(id)) == NULL)
1928: fatal("client_session2_setup: channel %d: unknown channel", id);
1929:
1.123 djm 1930: if (want_tty) {
1931: struct winsize ws;
1932: struct termios tio;
1933:
1934: /* Store window size in the packet. */
1935: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1936: memset(&ws, 0, sizeof(ws));
1937:
1938: channel_request_start(id, "pty-req", 0);
1939: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1940: packet_put_int((u_int)ws.ws_col);
1941: packet_put_int((u_int)ws.ws_row);
1942: packet_put_int((u_int)ws.ws_xpixel);
1943: packet_put_int((u_int)ws.ws_ypixel);
1.123 djm 1944: tio = get_saved_tio();
1945: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1946: packet_send();
1947: /* XXX wait for reply */
1.132 djm 1948: c->client_tty = 1;
1.123 djm 1949: }
1950:
1951: /* Transfer any environment variables from client to server */
1.126 djm 1952: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1953: int i, j, matched;
1954: char *name, *val;
1955:
1956: debug("Sending environment.");
1.126 djm 1957: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1958: /* Split */
1.126 djm 1959: name = xstrdup(env[i]);
1.123 djm 1960: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1961: xfree(name);
1.123 djm 1962: continue;
1963: }
1964: *val++ = '\0';
1965:
1966: matched = 0;
1967: for (j = 0; j < options.num_send_env; j++) {
1968: if (match_pattern(name, options.send_env[j])) {
1969: matched = 1;
1970: break;
1971: }
1972: }
1973: if (!matched) {
1974: debug3("Ignored env %s", name);
1.144 stevesk 1975: xfree(name);
1.123 djm 1976: continue;
1977: }
1978:
1979: debug("Sending env %s = %s", name, val);
1980: channel_request_start(id, "env", 0);
1981: packet_put_cstring(name);
1982: packet_put_cstring(val);
1983: packet_send();
1.144 stevesk 1984: xfree(name);
1.123 djm 1985: }
1986: }
1987:
1988: len = buffer_len(cmd);
1989: if (len > 0) {
1990: if (len > 900)
1991: len = 900;
1992: if (want_subsystem) {
1993: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1994: channel_request_start(id, "subsystem", subsys_repl != NULL);
1995: if (subsys_repl != NULL) {
1996: /* register callback for reply */
1997: /* XXX we assume that client_loop has already been called */
1998: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1999: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
2000: }
2001: } else {
2002: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
2003: channel_request_start(id, "exec", 0);
2004: }
2005: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2006: packet_send();
2007: } else {
2008: channel_request_start(id, "shell", 0);
2009: packet_send();
2010: }
2011: }
2012:
1.77 itojun 2013: static void
1.49 itojun 2014: client_init_dispatch_20(void)
1.16 markus 2015: {
1.55 markus 2016: dispatch_init(&dispatch_protocol_error);
1.100 markus 2017:
1.16 markus 2018: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2019: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2020: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2021: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2022: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2023: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2024: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2025: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2026: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 2027: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2028:
2029: /* rekeying */
2030: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2031:
2032: /* global request reply messages */
2033: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2034: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 2035: }
1.77 itojun 2036: static void
1.49 itojun 2037: client_init_dispatch_13(void)
1.15 markus 2038: {
2039: dispatch_init(NULL);
2040: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2041: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2042: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2043: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2044: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2045: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2046: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2047: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2048: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2049:
2050: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2051: &client_input_agent_open : &deny_input_open);
1.39 markus 2052: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2053: &x11_input_open : &deny_input_open);
1.15 markus 2054: }
1.77 itojun 2055: static void
1.49 itojun 2056: client_init_dispatch_15(void)
1.15 markus 2057: {
2058: client_init_dispatch_13();
2059: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2060: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2061: }
1.79 stevesk 2062: static void
1.49 itojun 2063: client_init_dispatch(void)
1.15 markus 2064: {
1.16 markus 2065: if (compat20)
2066: client_init_dispatch_20();
2067: else if (compat13)
1.15 markus 2068: client_init_dispatch_13();
2069: else
2070: client_init_dispatch_15();
1.113 markus 2071: }
2072:
2073: /* client specific fatal cleanup */
2074: void
1.114 markus 2075: cleanup_exit(int i)
1.113 markus 2076: {
2077: leave_raw_mode();
2078: leave_non_blocking();
1.123 djm 2079: if (options.control_path != NULL && control_fd != -1)
2080: unlink(options.control_path);
1.114 markus 2081: _exit(i);
1.1 deraadt 2082: }
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