Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.111
1.1 deraadt 1: /*
1.12 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
1.33 deraadt 5: * The main loop for the interactive session (client side).
1.20 markus 6: *
1.33 deraadt 7: * As far as I am concerned, the code I have written for this software
8: * can be used freely for any purpose. Any derived versions of this
9: * software must be clearly marked as such, and if the derived work is
10: * incompatible with the protocol description in the RFC file, it must be
11: * called by a name other than "ssh" or "Secure Shell".
12: *
13: *
14: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
19: * 1. Redistributions of source code must retain the above copyright
20: * notice, this list of conditions and the following disclaimer.
21: * 2. Redistributions in binary form must reproduce the above copyright
22: * notice, this list of conditions and the following disclaimer in the
23: * documentation and/or other materials provided with the distribution.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 35: *
36: *
1.33 deraadt 37: * SSH2 support added by Markus Friedl.
1.78 markus 38: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 39: *
1.33 deraadt 40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
50: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
51: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
52: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
53: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
54: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
55: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
56: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
57: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
58: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 59: */
1.1 deraadt 60:
61: #include "includes.h"
1.111 ! markus 62: RCSID("$OpenBSD: clientloop.c,v 1.110 2003/05/11 20:30:24 markus Exp $");
1.1 deraadt 63:
1.45 markus 64: #include "ssh.h"
65: #include "ssh1.h"
66: #include "ssh2.h"
1.1 deraadt 67: #include "xmalloc.h"
68: #include "packet.h"
69: #include "buffer.h"
1.15 markus 70: #include "compat.h"
1.74 markus 71: #include "channels.h"
1.15 markus 72: #include "dispatch.h"
1.30 markus 73: #include "buffer.h"
74: #include "bufaux.h"
1.40 markus 75: #include "key.h"
1.54 markus 76: #include "kex.h"
1.45 markus 77: #include "log.h"
78: #include "readconf.h"
79: #include "clientloop.h"
1.40 markus 80: #include "authfd.h"
1.45 markus 81: #include "atomicio.h"
1.62 stevesk 82: #include "sshtty.h"
1.63 markus 83: #include "misc.h"
1.97 jakob 84: #include "readpass.h"
1.39 markus 85:
86: /* import options */
87: extern Options options;
88:
1.1 deraadt 89: /* Flag indicating that stdin should be redirected from /dev/null. */
90: extern int stdin_null_flag;
91:
1.13 markus 92: /*
93: * Name of the host we are connecting to. This is the name given on the
94: * command line, or the HostName specified for the user-supplied name in a
95: * configuration file.
96: */
1.1 deraadt 97: extern char *host;
98:
1.13 markus 99: /*
100: * Flag to indicate that we have received a window change signal which has
101: * not yet been processed. This will cause a message indicating the new
102: * window size to be sent to the server a little later. This is volatile
103: * because this is updated in a signal handler.
104: */
1.88 markus 105: static volatile sig_atomic_t received_window_change_signal = 0;
106: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 107:
108: /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
109: static int in_non_blocking_mode = 0;
110:
111: /* Common data for the client loop code. */
1.31 markus 112: static int quit_pending; /* Set to non-zero to quit the client loop. */
113: static int escape_char; /* Escape character. */
1.11 markus 114: static int escape_pending; /* Last character was the escape character */
115: static int last_was_cr; /* Last character was a newline. */
116: static int exit_status; /* Used to store the exit status of the command. */
117: static int stdin_eof; /* EOF has been encountered on standard error. */
118: static Buffer stdin_buffer; /* Buffer for stdin data. */
119: static Buffer stdout_buffer; /* Buffer for stdout data. */
120: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 121: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
122: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 123: static int connection_in; /* Connection to server (input). */
124: static int connection_out; /* Connection to server (output). */
1.56 markus 125: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 126: static int session_closed = 0; /* In SSH2: login session closed. */
1.1 deraadt 127:
1.77 itojun 128: static void client_init_dispatch(void);
1.16 markus 129: int session_ident = -1;
130:
1.54 markus 131: /*XXX*/
132: extern Kex *xxx_kex;
133:
1.1 deraadt 134: /* Restores stdin to blocking mode. */
135:
1.77 itojun 136: static void
1.49 itojun 137: leave_non_blocking(void)
1.1 deraadt 138: {
1.11 markus 139: if (in_non_blocking_mode) {
140: (void) fcntl(fileno(stdin), F_SETFL, 0);
141: in_non_blocking_mode = 0;
142: fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL);
143: }
1.1 deraadt 144: }
145:
1.11 markus 146: /* Puts stdin terminal in non-blocking mode. */
147:
1.77 itojun 148: static void
1.49 itojun 149: enter_non_blocking(void)
1.1 deraadt 150: {
1.11 markus 151: in_non_blocking_mode = 1;
152: (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK);
153: fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL);
1.1 deraadt 154: }
155:
1.13 markus 156: /*
157: * Signal handler for the window change signal (SIGWINCH). This just sets a
158: * flag indicating that the window has changed.
159: */
1.1 deraadt 160:
1.77 itojun 161: static void
1.11 markus 162: window_change_handler(int sig)
1.1 deraadt 163: {
1.11 markus 164: received_window_change_signal = 1;
165: signal(SIGWINCH, window_change_handler);
1.1 deraadt 166: }
167:
1.13 markus 168: /*
169: * Signal handler for signals that cause the program to terminate. These
170: * signals must be trapped to restore terminal modes.
171: */
1.1 deraadt 172:
1.77 itojun 173: static void
1.11 markus 174: signal_handler(int sig)
1.1 deraadt 175: {
1.75 markus 176: received_signal = sig;
177: quit_pending = 1;
1.1 deraadt 178: }
179:
1.13 markus 180: /*
181: * Returns current time in seconds from Jan 1, 1970 with the maximum
182: * available resolution.
183: */
1.1 deraadt 184:
1.77 itojun 185: static double
1.49 itojun 186: get_current_time(void)
1.1 deraadt 187: {
1.11 markus 188: struct timeval tv;
189: gettimeofday(&tv, NULL);
190: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.1 deraadt 191: }
192:
1.13 markus 193: /*
194: * This is called when the interactive is entered. This checks if there is
195: * an EOF coming on stdin. We must check this explicitly, as select() does
196: * not appear to wake up when redirecting from /dev/null.
197: */
1.1 deraadt 198:
1.77 itojun 199: static void
1.49 itojun 200: client_check_initial_eof_on_stdin(void)
1.1 deraadt 201: {
1.11 markus 202: int len;
203: char buf[1];
1.1 deraadt 204:
1.13 markus 205: /*
206: * If standard input is to be "redirected from /dev/null", we simply
207: * mark that we have seen an EOF and send an EOF message to the
208: * server. Otherwise, we try to read a single character; it appears
209: * that for some files, such /dev/null, select() never wakes up for
210: * read for this descriptor, which means that we never get EOF. This
211: * way we will get the EOF if stdin comes from /dev/null or similar.
212: */
1.11 markus 213: if (stdin_null_flag) {
214: /* Fake EOF on stdin. */
215: debug("Sending eof.");
216: stdin_eof = 1;
217: packet_start(SSH_CMSG_EOF);
218: packet_send();
219: } else {
220: enter_non_blocking();
221:
222: /* Check for immediate EOF on stdin. */
223: len = read(fileno(stdin), buf, 1);
224: if (len == 0) {
1.13 markus 225: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 226: debug("Sending eof.");
227: stdin_eof = 1;
228: packet_start(SSH_CMSG_EOF);
229: packet_send();
230: } else if (len > 0) {
1.13 markus 231: /*
232: * Got data. We must store the data in the buffer,
233: * and also process it as an escape character if
234: * appropriate.
235: */
1.42 markus 236: if ((u_char) buf[0] == escape_char)
1.11 markus 237: escape_pending = 1;
1.52 markus 238: else
1.11 markus 239: buffer_append(&stdin_buffer, buf, 1);
240: }
241: leave_non_blocking();
242: }
1.1 deraadt 243: }
244:
245:
1.13 markus 246: /*
247: * Make packets from buffered stdin data, and buffer them for sending to the
248: * connection.
249: */
1.1 deraadt 250:
1.77 itojun 251: static void
1.49 itojun 252: client_make_packets_from_stdin_data(void)
1.1 deraadt 253: {
1.42 markus 254: u_int len;
1.1 deraadt 255:
1.11 markus 256: /* Send buffered stdin data to the server. */
257: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 258: packet_not_very_much_data_to_write()) {
1.11 markus 259: len = buffer_len(&stdin_buffer);
260: /* Keep the packets at reasonable size. */
261: if (len > packet_get_maxsize())
262: len = packet_get_maxsize();
263: packet_start(SSH_CMSG_STDIN_DATA);
264: packet_put_string(buffer_ptr(&stdin_buffer), len);
265: packet_send();
266: buffer_consume(&stdin_buffer, len);
1.52 markus 267: stdin_bytes += len;
1.11 markus 268: /* If we have a pending EOF, send it now. */
269: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
270: packet_start(SSH_CMSG_EOF);
271: packet_send();
272: }
1.1 deraadt 273: }
274: }
275:
1.13 markus 276: /*
277: * Checks if the client window has changed, and sends a packet about it to
278: * the server if so. The actual change is detected elsewhere (by a software
279: * interrupt on Unix); this just checks the flag and sends a message if
280: * appropriate.
281: */
1.1 deraadt 282:
1.77 itojun 283: static void
1.49 itojun 284: client_check_window_change(void)
1.1 deraadt 285: {
1.16 markus 286: struct winsize ws;
287:
288: if (! received_window_change_signal)
289: return;
290: /** XXX race */
291: received_window_change_signal = 0;
292:
293: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
294: return;
295:
1.37 markus 296: debug2("client_check_window_change: changed");
1.16 markus 297:
298: if (compat20) {
299: channel_request_start(session_ident, "window-change", 0);
300: packet_put_int(ws.ws_col);
301: packet_put_int(ws.ws_row);
302: packet_put_int(ws.ws_xpixel);
303: packet_put_int(ws.ws_ypixel);
304: packet_send();
305: } else {
306: packet_start(SSH_CMSG_WINDOW_SIZE);
307: packet_put_int(ws.ws_row);
308: packet_put_int(ws.ws_col);
309: packet_put_int(ws.ws_xpixel);
310: packet_put_int(ws.ws_ypixel);
311: packet_send();
1.1 deraadt 312: }
313: }
314:
1.13 markus 315: /*
316: * Waits until the client can do something (some data becomes available on
317: * one of the file descriptors).
318: */
1.1 deraadt 319:
1.77 itojun 320: static void
1.46 markus 321: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.81 markus 322: int *maxfdp, int *nallocp, int rekeying)
1.11 markus 323: {
1.46 markus 324: /* Add any selections by the channel mechanism. */
1.81 markus 325: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 326:
1.16 markus 327: if (!compat20) {
1.17 markus 328: /* Read from the connection, unless our buffers are full. */
1.16 markus 329: if (buffer_len(&stdout_buffer) < buffer_high &&
330: buffer_len(&stderr_buffer) < buffer_high &&
331: channel_not_very_much_buffered_data())
1.46 markus 332: FD_SET(connection_in, *readsetp);
1.17 markus 333: /*
334: * Read from stdin, unless we have seen EOF or have very much
335: * buffered data to send to the server.
336: */
337: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 338: FD_SET(fileno(stdin), *readsetp);
1.17 markus 339:
340: /* Select stdout/stderr if have data in buffer. */
341: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 342: FD_SET(fileno(stdout), *writesetp);
1.17 markus 343: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 344: FD_SET(fileno(stderr), *writesetp);
1.16 markus 345: } else {
1.71 markus 346: /* channel_prepare_select could have closed the last channel */
1.84 markus 347: if (session_closed && !channel_still_open() &&
348: !packet_have_data_to_write()) {
349: /* clear mask since we did not call select() */
1.87 markus 350: memset(*readsetp, 0, *nallocp);
351: memset(*writesetp, 0, *nallocp);
1.84 markus 352: return;
1.71 markus 353: } else {
354: FD_SET(connection_in, *readsetp);
355: }
1.16 markus 356: }
1.11 markus 357:
358: /* Select server connection if have data to write to the server. */
359: if (packet_have_data_to_write())
1.46 markus 360: FD_SET(connection_out, *writesetp);
1.11 markus 361:
1.13 markus 362: /*
363: * Wait for something to happen. This will suspend the process until
364: * some selected descriptor can be read, written, or has some other
365: * event pending. Note: if you want to implement SSH_MSG_IGNORE
366: * messages to fool traffic analysis, this might be the place to do
367: * it: just have a random timeout for the select, and send a random
368: * SSH_MSG_IGNORE packet when the timeout expires.
369: */
1.11 markus 370:
1.46 markus 371: if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) {
1.11 markus 372: char buf[100];
1.51 markus 373:
374: /*
375: * We have to clear the select masks, because we return.
376: * We have to return, because the mainloop checks for the flags
377: * set by the signal handlers.
378: */
1.87 markus 379: memset(*readsetp, 0, *nallocp);
380: memset(*writesetp, 0, *nallocp);
1.50 deraadt 381:
1.11 markus 382: if (errno == EINTR)
383: return;
384: /* Note: we might still have data in the buffers. */
385: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
386: buffer_append(&stderr_buffer, buf, strlen(buf));
387: quit_pending = 1;
388: }
389: }
390:
1.77 itojun 391: static void
1.31 markus 392: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 393: {
1.11 markus 394: struct winsize oldws, newws;
395:
396: /* Flush stdout and stderr buffers. */
1.31 markus 397: if (buffer_len(bout) > 0)
398: atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
399: if (buffer_len(berr) > 0)
400: atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 401:
402: leave_raw_mode();
403:
1.13 markus 404: /*
405: * Free (and clear) the buffer to reduce the amount of data that gets
406: * written to swap.
407: */
1.31 markus 408: buffer_free(bin);
409: buffer_free(bout);
410: buffer_free(berr);
1.11 markus 411:
412: /* Save old window size. */
413: ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
414:
415: /* Send the suspend signal to the program itself. */
416: kill(getpid(), SIGTSTP);
417:
418: /* Check if the window size has changed. */
419: if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 &&
420: (oldws.ws_row != newws.ws_row ||
1.90 deraadt 421: oldws.ws_col != newws.ws_col ||
422: oldws.ws_xpixel != newws.ws_xpixel ||
423: oldws.ws_ypixel != newws.ws_ypixel))
1.11 markus 424: received_window_change_signal = 1;
425:
426: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 427: buffer_init(bin);
428: buffer_init(bout);
429: buffer_init(berr);
1.11 markus 430:
431: enter_raw_mode();
432: }
433:
1.77 itojun 434: static void
1.17 markus 435: client_process_net_input(fd_set * readset)
1.11 markus 436: {
1.17 markus 437: int len;
438: char buf[8192];
1.11 markus 439:
1.13 markus 440: /*
441: * Read input from the server, and add any such data to the buffer of
442: * the packet subsystem.
443: */
1.11 markus 444: if (FD_ISSET(connection_in, readset)) {
445: /* Read as much as possible. */
446: len = read(connection_in, buf, sizeof(buf));
447: if (len == 0) {
448: /* Received EOF. The remote host has closed the connection. */
449: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
450: host);
1.1 deraadt 451: buffer_append(&stderr_buffer, buf, strlen(buf));
452: quit_pending = 1;
453: return;
1.11 markus 454: }
1.13 markus 455: /*
456: * There is a kernel bug on Solaris that causes select to
457: * sometimes wake up even though there is no data available.
458: */
1.53 millert 459: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 460: len = 0;
461:
462: if (len < 0) {
463: /* An error has encountered. Perhaps there is a network problem. */
464: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
465: host, strerror(errno));
466: buffer_append(&stderr_buffer, buf, strlen(buf));
467: quit_pending = 1;
468: return;
469: }
470: packet_process_incoming(buf, len);
471: }
1.17 markus 472: }
1.16 markus 473:
1.97 jakob 474: static void
1.99 markus 475: process_cmdline(void)
1.97 jakob 476: {
477: void (*handler)(int);
478: char *s, *cmd;
479: u_short fwd_port, fwd_host_port;
480: char buf[1024], sfwd_port[6], sfwd_host_port[6];
481: int local = 0;
482:
483: leave_raw_mode();
1.101 markus 484: handler = signal(SIGINT, SIG_IGN);
1.99 markus 485: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 486: if (s == NULL)
487: goto out;
488: while (*s && isspace(*s))
489: s++;
490: if (*s == 0)
491: goto out;
492: if (strlen(s) < 2 || s[0] != '-' || !(s[1] == 'L' || s[1] == 'R')) {
1.109 itojun 493: logit("Invalid command.");
1.97 jakob 494: goto out;
495: }
496: if (s[1] == 'L')
497: local = 1;
498: if (!local && !compat20) {
1.109 itojun 499: logit("Not supported for SSH protocol version 1.");
1.97 jakob 500: goto out;
501: }
502: s += 2;
503: while (*s && isspace(*s))
504: s++;
505:
506: if (sscanf(s, "%5[0-9]:%255[^:]:%5[0-9]",
507: sfwd_port, buf, sfwd_host_port) != 3 &&
508: sscanf(s, "%5[0-9]/%255[^/]/%5[0-9]",
509: sfwd_port, buf, sfwd_host_port) != 3) {
1.109 itojun 510: logit("Bad forwarding specification.");
1.97 jakob 511: goto out;
512: }
513: if ((fwd_port = a2port(sfwd_port)) == 0 ||
514: (fwd_host_port = a2port(sfwd_host_port)) == 0) {
1.109 itojun 515: logit("Bad forwarding port(s).");
1.97 jakob 516: goto out;
517: }
518: if (local) {
1.99 markus 519: if (channel_setup_local_fwd_listener(fwd_port, buf,
520: fwd_host_port, options.gateway_ports) < 0) {
1.109 itojun 521: logit("Port forwarding failed.");
1.97 jakob 522: goto out;
523: }
524: } else
525: channel_request_remote_forwarding(fwd_port, buf,
526: fwd_host_port);
1.109 itojun 527: logit("Forwarding port.");
1.97 jakob 528: out:
529: signal(SIGINT, handler);
530: enter_raw_mode();
531: if (cmd)
532: xfree(cmd);
533: }
534:
1.31 markus 535: /* process the characters one by one */
1.77 itojun 536: static int
1.31 markus 537: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
538: {
1.32 markus 539: char string[1024];
1.31 markus 540: pid_t pid;
541: int bytes = 0;
1.42 markus 542: u_int i;
543: u_char ch;
1.31 markus 544: char *s;
545:
546: for (i = 0; i < len; i++) {
547: /* Get one character at a time. */
548: ch = buf[i];
549:
550: if (escape_pending) {
551: /* We have previously seen an escape character. */
552: /* Clear the flag now. */
553: escape_pending = 0;
554:
555: /* Process the escaped character. */
556: switch (ch) {
557: case '.':
558: /* Terminate the connection. */
1.32 markus 559: snprintf(string, sizeof string, "%c.\r\n", escape_char);
560: buffer_append(berr, string, strlen(string));
1.31 markus 561:
562: quit_pending = 1;
563: return -1;
564:
565: case 'Z' - 64:
566: /* Suspend the program. */
567: /* Print a message to that effect to the user. */
1.32 markus 568: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
569: buffer_append(berr, string, strlen(string));
1.31 markus 570:
571: /* Restore terminal modes and suspend. */
572: client_suspend_self(bin, bout, berr);
573:
574: /* We have been continued. */
575: continue;
576:
1.111 ! markus 577: case 'B':
! 578: if (compat20) {
! 579: snprintf(string, sizeof string,
! 580: "%cB\r\n", escape_char);
! 581: buffer_append(berr, string,
! 582: strlen(string));
! 583: channel_request_start(session_ident,
! 584: "break", 0);
! 585: packet_put_int(1000);
! 586: packet_send();
! 587: }
! 588: continue;
! 589:
1.54 markus 590: case 'R':
1.59 markus 591: if (compat20) {
592: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 593: logit("Server does not support re-keying");
1.59 markus 594: else
595: need_rekeying = 1;
596: }
1.54 markus 597: continue;
598:
1.31 markus 599: case '&':
600: /*
601: * Detach the program (continue to serve connections,
602: * but put in background and no more new connections).
603: */
604: /* Restore tty modes. */
605: leave_raw_mode();
606:
607: /* Stop listening for new connections. */
1.86 markus 608: channel_stop_listening();
1.31 markus 609:
1.86 markus 610: snprintf(string, sizeof string,
611: "%c& [backgrounded]\n", escape_char);
612: buffer_append(berr, string, strlen(string));
1.31 markus 613:
614: /* Fork into background. */
615: pid = fork();
616: if (pid < 0) {
617: error("fork: %.100s", strerror(errno));
618: continue;
619: }
620: if (pid != 0) { /* This is the parent. */
621: /* The parent just exits. */
622: exit(0);
623: }
624: /* The child continues serving connections. */
1.86 markus 625: if (compat20) {
626: buffer_append(bin, "\004", 1);
627: /* fake EOF on stdin */
628: return -1;
629: } else if (!stdin_eof) {
630: /*
631: * Sending SSH_CMSG_EOF alone does not always appear
632: * to be enough. So we try to send an EOF character
633: * first.
634: */
635: packet_start(SSH_CMSG_STDIN_DATA);
636: packet_put_string("\004", 1);
637: packet_send();
638: /* Close stdin. */
639: stdin_eof = 1;
640: if (buffer_len(bin) == 0) {
641: packet_start(SSH_CMSG_EOF);
642: packet_send();
643: }
644: }
645: continue;
1.31 markus 646:
647: case '?':
1.32 markus 648: snprintf(string, sizeof string,
1.31 markus 649: "%c?\r\n\
650: Supported escape sequences:\r\n\
1.104 stevesk 651: %c. - terminate connection\r\n\
1.111 ! markus 652: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 653: %cC - open a command line\r\n\
654: %cR - Request rekey (SSH protocol 2 only)\r\n\
655: %c^Z - suspend ssh\r\n\
656: %c# - list forwarded connections\r\n\
657: %c& - background ssh (when waiting for connections to terminate)\r\n\
658: %c? - this message\r\n\
659: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 660: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 661: escape_char, escape_char, escape_char, escape_char,
662: escape_char, escape_char, escape_char, escape_char,
1.111 ! markus 663: escape_char, escape_char, escape_char);
1.32 markus 664: buffer_append(berr, string, strlen(string));
1.31 markus 665: continue;
666:
667: case '#':
1.32 markus 668: snprintf(string, sizeof string, "%c#\r\n", escape_char);
669: buffer_append(berr, string, strlen(string));
1.31 markus 670: s = channel_open_message();
671: buffer_append(berr, s, strlen(s));
672: xfree(s);
1.97 jakob 673: continue;
674:
675: case 'C':
1.99 markus 676: process_cmdline();
1.31 markus 677: continue;
678:
679: default:
680: if (ch != escape_char) {
681: buffer_put_char(bin, escape_char);
682: bytes++;
683: }
684: /* Escaped characters fall through here */
685: break;
686: }
687: } else {
688: /*
689: * The previous character was not an escape char. Check if this
690: * is an escape.
691: */
692: if (last_was_cr && ch == escape_char) {
693: /* It is. Set the flag and continue to next character. */
694: escape_pending = 1;
695: continue;
696: }
697: }
698:
699: /*
700: * Normal character. Record whether it was a newline,
701: * and append it to the buffer.
702: */
703: last_was_cr = (ch == '\r' || ch == '\n');
704: buffer_put_char(bin, ch);
705: bytes++;
706: }
707: return bytes;
708: }
709:
1.77 itojun 710: static void
1.17 markus 711: client_process_input(fd_set * readset)
712: {
1.21 deraadt 713: int len;
1.31 markus 714: char buf[8192];
1.16 markus 715:
1.11 markus 716: /* Read input from stdin. */
717: if (FD_ISSET(fileno(stdin), readset)) {
718: /* Read as much as possible. */
719: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 720: if (len < 0 && (errno == EAGAIN || errno == EINTR))
721: return; /* we'll try again later */
1.11 markus 722: if (len <= 0) {
1.13 markus 723: /*
724: * Received EOF or error. They are treated
725: * similarly, except that an error message is printed
726: * if it was an error condition.
727: */
1.11 markus 728: if (len < 0) {
729: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
730: buffer_append(&stderr_buffer, buf, strlen(buf));
731: }
732: /* Mark that we have seen EOF. */
733: stdin_eof = 1;
1.13 markus 734: /*
735: * Send an EOF message to the server unless there is
736: * data in the buffer. If there is data in the
737: * buffer, no message will be sent now. Code
738: * elsewhere will send the EOF when the buffer
739: * becomes empty if stdin_eof is set.
740: */
1.11 markus 741: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 742: packet_start(SSH_CMSG_EOF);
743: packet_send();
1.11 markus 744: }
1.72 stevesk 745: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 746: /*
747: * Normal successful read, and no escape character.
748: * Just append the data to buffer.
749: */
1.11 markus 750: buffer_append(&stdin_buffer, buf, len);
751: } else {
1.13 markus 752: /*
753: * Normal, successful read. But we have an escape character
754: * and have to process the characters one by one.
755: */
1.52 markus 756: if (process_escapes(&stdin_buffer, &stdout_buffer,
757: &stderr_buffer, buf, len) == -1)
1.31 markus 758: return;
1.11 markus 759: }
760: }
761: }
762:
1.77 itojun 763: static void
1.11 markus 764: client_process_output(fd_set * writeset)
765: {
766: int len;
767: char buf[100];
1.1 deraadt 768:
1.11 markus 769: /* Write buffered output to stdout. */
770: if (FD_ISSET(fileno(stdout), writeset)) {
771: /* Write as much data as possible. */
772: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 773: buffer_len(&stdout_buffer));
1.11 markus 774: if (len <= 0) {
1.64 markus 775: if (errno == EINTR || errno == EAGAIN)
1.11 markus 776: len = 0;
777: else {
1.13 markus 778: /*
779: * An error or EOF was encountered. Put an
780: * error message to stderr buffer.
781: */
1.11 markus 782: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
783: buffer_append(&stderr_buffer, buf, strlen(buf));
784: quit_pending = 1;
785: return;
786: }
787: }
788: /* Consume printed data from the buffer. */
789: buffer_consume(&stdout_buffer, len);
1.57 markus 790: stdout_bytes += len;
1.11 markus 791: }
792: /* Write buffered output to stderr. */
793: if (FD_ISSET(fileno(stderr), writeset)) {
794: /* Write as much data as possible. */
795: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 796: buffer_len(&stderr_buffer));
1.11 markus 797: if (len <= 0) {
1.64 markus 798: if (errno == EINTR || errno == EAGAIN)
1.11 markus 799: len = 0;
800: else {
1.13 markus 801: /* EOF or error, but can't even print error message. */
1.11 markus 802: quit_pending = 1;
803: return;
804: }
805: }
806: /* Consume printed characters from the buffer. */
807: buffer_consume(&stderr_buffer, len);
1.57 markus 808: stderr_bytes += len;
1.11 markus 809: }
1.1 deraadt 810: }
811:
1.13 markus 812: /*
1.15 markus 813: * Get packets from the connection input buffer, and process them as long as
814: * there are packets available.
815: *
816: * Any unknown packets received during the actual
817: * session cause the session to terminate. This is
818: * intended to make debugging easier since no
819: * confirmations are sent. Any compatible protocol
820: * extensions must be negotiated during the
821: * preparatory phase.
822: */
823:
1.77 itojun 824: static void
1.49 itojun 825: client_process_buffered_input_packets(void)
1.15 markus 826: {
1.54 markus 827: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 828: }
829:
1.31 markus 830: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 831:
1.77 itojun 832: static int
1.31 markus 833: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 834: {
1.31 markus 835: /* XXX we assume c->extended is writeable */
836: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 837: }
838:
1.77 itojun 839: static void
1.60 markus 840: client_channel_closed(int id, void *arg)
841: {
842: if (id != session_ident)
843: error("client_channel_closed: id %d != session_ident %d",
844: id, session_ident);
1.83 markus 845: channel_cancel_cleanup(id);
1.60 markus 846: session_closed = 1;
1.62 stevesk 847: if (in_raw_mode())
1.61 markus 848: leave_raw_mode();
1.60 markus 849: }
850:
1.15 markus 851: /*
1.13 markus 852: * Implements the interactive session with the server. This is called after
853: * the user has been authenticated, and a command has been started on the
1.72 stevesk 854: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
855: * used as an escape character for terminating or suspending the session.
1.13 markus 856: */
1.1 deraadt 857:
1.20 markus 858: int
1.30 markus 859: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 860: {
1.46 markus 861: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 862: double start_time, total_time;
1.81 markus 863: int max_fd = 0, max_fd2 = 0, len, rekeying = 0, nalloc = 0;
1.11 markus 864: char buf[100];
865:
866: debug("Entering interactive session.");
867:
868: start_time = get_current_time();
869:
870: /* Initialize variables. */
871: escape_pending = 0;
872: last_was_cr = 1;
873: exit_status = -1;
874: stdin_eof = 0;
875: buffer_high = 64 * 1024;
876: connection_in = packet_get_connection_in();
877: connection_out = packet_get_connection_out();
1.46 markus 878: max_fd = MAX(connection_in, connection_out);
879:
880: if (!compat20) {
1.63 markus 881: /* enable nonblocking unless tty */
882: if (!isatty(fileno(stdin)))
883: set_nonblock(fileno(stdin));
884: if (!isatty(fileno(stdout)))
885: set_nonblock(fileno(stdout));
886: if (!isatty(fileno(stderr)))
887: set_nonblock(fileno(stderr));
1.46 markus 888: max_fd = MAX(max_fd, fileno(stdin));
889: max_fd = MAX(max_fd, fileno(stdout));
890: max_fd = MAX(max_fd, fileno(stderr));
891: }
1.11 markus 892: stdin_bytes = 0;
893: stdout_bytes = 0;
894: stderr_bytes = 0;
895: quit_pending = 0;
896: escape_char = escape_char_arg;
897:
898: /* Initialize buffers. */
899: buffer_init(&stdin_buffer);
900: buffer_init(&stdout_buffer);
901: buffer_init(&stderr_buffer);
902:
1.15 markus 903: client_init_dispatch();
904:
1.105 markus 905: /*
906: * Set signal handlers, (e.g. to restore non-blocking mode)
907: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
908: */
909: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
910: signal(SIGINT, signal_handler);
911: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
912: signal(SIGQUIT, signal_handler);
913: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
914: signal(SIGTERM, signal_handler);
1.11 markus 915: if (have_pty)
916: signal(SIGWINCH, window_change_handler);
917:
918: if (have_pty)
919: enter_raw_mode();
920:
1.48 markus 921: if (compat20) {
922: session_ident = ssh2_chan_id;
1.72 stevesk 923: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 924: channel_register_filter(session_ident,
925: simple_escape_filter);
1.60 markus 926: if (session_ident != -1)
927: channel_register_cleanup(session_ident,
928: client_channel_closed);
1.48 markus 929: } else {
930: /* Check if we should immediately send eof on stdin. */
1.16 markus 931: client_check_initial_eof_on_stdin();
1.48 markus 932: }
1.30 markus 933:
1.11 markus 934: /* Main loop of the client for the interactive session mode. */
935: while (!quit_pending) {
936:
1.13 markus 937: /* Process buffered packets sent by the server. */
1.11 markus 938: client_process_buffered_input_packets();
939:
1.60 markus 940: if (compat20 && session_closed && !channel_still_open())
941: break;
942:
1.56 markus 943: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 944:
1.56 markus 945: if (rekeying) {
946: debug("rekeying in progress");
947: } else {
948: /*
949: * Make packets of buffered stdin data, and buffer
950: * them for sending to the server.
951: */
952: if (!compat20)
953: client_make_packets_from_stdin_data();
1.11 markus 954:
1.56 markus 955: /*
956: * Make packets from buffered channel data, and
957: * enqueue them for sending to the server.
958: */
959: if (packet_not_very_much_data_to_write())
960: channel_output_poll();
1.11 markus 961:
1.56 markus 962: /*
963: * Check if the window size has changed, and buffer a
964: * message about it to the server if so.
965: */
966: client_check_window_change();
1.11 markus 967:
1.56 markus 968: if (quit_pending)
969: break;
970: }
1.13 markus 971: /*
972: * Wait until we have something to do (something becomes
973: * available on one of the descriptors).
974: */
1.81 markus 975: max_fd2 = max_fd;
1.56 markus 976: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 977: &max_fd2, &nalloc, rekeying);
1.11 markus 978:
979: if (quit_pending)
980: break;
981:
1.56 markus 982: /* Do channel operations unless rekeying in progress. */
983: if (!rekeying) {
984: channel_after_select(readset, writeset);
1.108 markus 985: if (need_rekeying || packet_need_rekeying()) {
986: debug("need rekeying");
1.56 markus 987: xxx_kex->done = 0;
988: kex_send_kexinit(xxx_kex);
989: need_rekeying = 0;
990: }
991: }
1.11 markus 992:
1.17 markus 993: /* Buffer input from the connection. */
1.46 markus 994: client_process_net_input(readset);
1.17 markus 995:
996: if (quit_pending)
997: break;
1.11 markus 998:
1.17 markus 999: if (!compat20) {
1000: /* Buffer data from stdin */
1.46 markus 1001: client_process_input(readset);
1.17 markus 1002: /*
1003: * Process output to stdout and stderr. Output to
1004: * the connection is processed elsewhere (above).
1005: */
1.46 markus 1006: client_process_output(writeset);
1.17 markus 1007: }
1.11 markus 1008:
1.13 markus 1009: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1010: if (FD_ISSET(connection_out, writeset))
1.11 markus 1011: packet_write_poll();
1012: }
1.46 markus 1013: if (readset)
1014: xfree(readset);
1015: if (writeset)
1016: xfree(writeset);
1.11 markus 1017:
1018: /* Terminate the session. */
1019:
1020: /* Stop watching for window change. */
1021: if (have_pty)
1022: signal(SIGWINCH, SIG_DFL);
1023:
1.76 markus 1024: channel_free_all();
1.11 markus 1025:
1.75 markus 1026: if (have_pty)
1027: leave_raw_mode();
1028:
1029: /* restore blocking io */
1030: if (!isatty(fileno(stdin)))
1031: unset_nonblock(fileno(stdin));
1032: if (!isatty(fileno(stdout)))
1033: unset_nonblock(fileno(stdout));
1034: if (!isatty(fileno(stderr)))
1035: unset_nonblock(fileno(stderr));
1036:
1037: if (received_signal) {
1038: if (in_non_blocking_mode) /* XXX */
1039: leave_non_blocking();
1.89 itojun 1040: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1041: }
1042:
1.13 markus 1043: /*
1044: * In interactive mode (with pseudo tty) display a message indicating
1045: * that the connection has been closed.
1046: */
1.11 markus 1047: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1048: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1049: buffer_append(&stderr_buffer, buf, strlen(buf));
1050: }
1.70 markus 1051:
1.11 markus 1052: /* Output any buffered data for stdout. */
1.70 markus 1053: while (buffer_len(&stdout_buffer) > 0) {
1054: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1055: buffer_len(&stdout_buffer));
1.70 markus 1056: if (len <= 0) {
1.11 markus 1057: error("Write failed flushing stdout buffer.");
1.70 markus 1058: break;
1059: }
1.11 markus 1060: buffer_consume(&stdout_buffer, len);
1.57 markus 1061: stdout_bytes += len;
1.11 markus 1062: }
1063:
1064: /* Output any buffered data for stderr. */
1.70 markus 1065: while (buffer_len(&stderr_buffer) > 0) {
1066: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1067: buffer_len(&stderr_buffer));
1.70 markus 1068: if (len <= 0) {
1.11 markus 1069: error("Write failed flushing stderr buffer.");
1.70 markus 1070: break;
1071: }
1.11 markus 1072: buffer_consume(&stderr_buffer, len);
1.57 markus 1073: stderr_bytes += len;
1.11 markus 1074: }
1075:
1076: /* Clear and free any buffers. */
1077: memset(buf, 0, sizeof(buf));
1078: buffer_free(&stdin_buffer);
1079: buffer_free(&stdout_buffer);
1080: buffer_free(&stderr_buffer);
1081:
1082: /* Report bytes transferred, and transfer rates. */
1083: total_time = get_current_time() - start_time;
1084: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1085: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1086: if (total_time > 0)
1087: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1088: stdin_bytes / total_time, stdout_bytes / total_time,
1089: stderr_bytes / total_time);
1.11 markus 1090:
1091: /* Return the exit status of the program. */
1092: debug("Exit status %d", exit_status);
1093: return exit_status;
1.15 markus 1094: }
1095:
1096: /*********/
1097:
1.77 itojun 1098: static void
1.94 markus 1099: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1100: {
1.42 markus 1101: u_int data_len;
1.15 markus 1102: char *data = packet_get_string(&data_len);
1.93 markus 1103: packet_check_eom();
1.15 markus 1104: buffer_append(&stdout_buffer, data, data_len);
1105: memset(data, 0, data_len);
1106: xfree(data);
1107: }
1.77 itojun 1108: static void
1.94 markus 1109: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1110: {
1.42 markus 1111: u_int data_len;
1.15 markus 1112: char *data = packet_get_string(&data_len);
1.93 markus 1113: packet_check_eom();
1.15 markus 1114: buffer_append(&stderr_buffer, data, data_len);
1115: memset(data, 0, data_len);
1116: xfree(data);
1117: }
1.77 itojun 1118: static void
1.94 markus 1119: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1120: {
1121: exit_status = packet_get_int();
1.93 markus 1122: packet_check_eom();
1.15 markus 1123: /* Acknowledge the exit. */
1124: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1125: packet_send();
1126: /*
1127: * Must wait for packet to be sent since we are
1128: * exiting the loop.
1129: */
1130: packet_write_wait();
1131: /* Flag that we want to exit. */
1132: quit_pending = 1;
1133: }
1134:
1.77 itojun 1135: static Channel *
1.40 markus 1136: client_request_forwarded_tcpip(const char *request_type, int rchan)
1137: {
1.103 deraadt 1138: Channel *c = NULL;
1.40 markus 1139: char *listen_address, *originator_address;
1140: int listen_port, originator_port;
1.67 markus 1141: int sock;
1.40 markus 1142:
1143: /* Get rest of the packet */
1144: listen_address = packet_get_string(NULL);
1145: listen_port = packet_get_int();
1146: originator_address = packet_get_string(NULL);
1147: originator_port = packet_get_int();
1.93 markus 1148: packet_check_eom();
1.40 markus 1149:
1150: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1151: listen_address, listen_port, originator_address, originator_port);
1152:
1.80 stevesk 1153: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1154: if (sock < 0) {
1155: xfree(originator_address);
1156: xfree(listen_address);
1157: return NULL;
1158: }
1159: c = channel_new("forwarded-tcpip",
1160: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1161: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1162: originator_address, 1);
1.40 markus 1163: xfree(originator_address);
1164: xfree(listen_address);
1165: return c;
1166: }
1167:
1.103 deraadt 1168: static Channel *
1.40 markus 1169: client_request_x11(const char *request_type, int rchan)
1170: {
1171: Channel *c = NULL;
1172: char *originator;
1173: int originator_port;
1.67 markus 1174: int sock;
1.40 markus 1175:
1176: if (!options.forward_x11) {
1177: error("Warning: ssh server tried X11 forwarding.");
1178: error("Warning: this is probably a break in attempt by a malicious server.");
1179: return NULL;
1180: }
1181: originator = packet_get_string(NULL);
1182: if (datafellows & SSH_BUG_X11FWD) {
1183: debug2("buggy server: x11 request w/o originator_port");
1184: originator_port = 0;
1185: } else {
1186: originator_port = packet_get_int();
1187: }
1.93 markus 1188: packet_check_eom();
1.40 markus 1189: /* XXX check permission */
1.47 markus 1190: debug("client_request_x11: request from %s %d", originator,
1191: originator_port);
1.67 markus 1192: xfree(originator);
1.40 markus 1193: sock = x11_connect_display();
1.67 markus 1194: if (sock < 0)
1195: return NULL;
1196: c = channel_new("x11",
1197: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1198: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1199: c->force_drain = 1;
1.40 markus 1200: return c;
1201: }
1202:
1.103 deraadt 1203: static Channel *
1.40 markus 1204: client_request_agent(const char *request_type, int rchan)
1205: {
1206: Channel *c = NULL;
1.67 markus 1207: int sock;
1.40 markus 1208:
1209: if (!options.forward_agent) {
1210: error("Warning: ssh server tried agent forwarding.");
1211: error("Warning: this is probably a break in attempt by a malicious server.");
1212: return NULL;
1213: }
1214: sock = ssh_get_authentication_socket();
1.67 markus 1215: if (sock < 0)
1216: return NULL;
1217: c = channel_new("authentication agent connection",
1218: SSH_CHANNEL_OPEN, sock, sock, -1,
1219: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1220: "authentication agent connection", 1);
1.82 markus 1221: c->force_drain = 1;
1.40 markus 1222: return c;
1223: }
1224:
1.22 markus 1225: /* XXXX move to generic input handler */
1.77 itojun 1226: static void
1.94 markus 1227: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1228: {
1229: Channel *c = NULL;
1230: char *ctype;
1231: int rchan;
1.102 markus 1232: u_int rmaxpack, rwindow, len;
1.22 markus 1233:
1234: ctype = packet_get_string(&len);
1235: rchan = packet_get_int();
1236: rwindow = packet_get_int();
1237: rmaxpack = packet_get_int();
1238:
1.24 markus 1239: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1240: ctype, rchan, rwindow, rmaxpack);
1241:
1.40 markus 1242: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1243: c = client_request_forwarded_tcpip(ctype, rchan);
1244: } else if (strcmp(ctype, "x11") == 0) {
1245: c = client_request_x11(ctype, rchan);
1246: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1247: c = client_request_agent(ctype, rchan);
1.22 markus 1248: }
1249: /* XXX duplicate : */
1250: if (c != NULL) {
1251: debug("confirm %s", ctype);
1252: c->remote_id = rchan;
1253: c->remote_window = rwindow;
1254: c->remote_maxpacket = rmaxpack;
1.69 markus 1255: if (c->type != SSH_CHANNEL_CONNECTING) {
1256: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1257: packet_put_int(c->remote_id);
1258: packet_put_int(c->self);
1259: packet_put_int(c->local_window);
1260: packet_put_int(c->local_maxpacket);
1261: packet_send();
1262: }
1.22 markus 1263: } else {
1264: debug("failure %s", ctype);
1265: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1266: packet_put_int(rchan);
1267: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1268: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1269: packet_put_cstring("open failed");
1.66 markus 1270: packet_put_cstring("");
1271: }
1.22 markus 1272: packet_send();
1273: }
1274: xfree(ctype);
1275: }
1.77 itojun 1276: static void
1.94 markus 1277: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1278: {
1279: Channel *c = NULL;
1280: int id, reply, success = 0;
1281: char *rtype;
1282:
1283: id = packet_get_int();
1284: rtype = packet_get_string(NULL);
1285: reply = packet_get_char();
1286:
1287: debug("client_input_channel_req: channel %d rtype %s reply %d",
1288: id, rtype, reply);
1289:
1290: if (session_ident == -1) {
1291: error("client_input_channel_req: no channel %d", session_ident);
1292: } else if (id != session_ident) {
1293: error("client_input_channel_req: channel %d: wrong channel: %d",
1294: session_ident, id);
1295: }
1296: c = channel_lookup(id);
1297: if (c == NULL) {
1298: error("client_input_channel_req: channel %d: unknown channel", id);
1299: } else if (strcmp(rtype, "exit-status") == 0) {
1300: success = 1;
1301: exit_status = packet_get_int();
1.93 markus 1302: packet_check_eom();
1.48 markus 1303: }
1304: if (reply) {
1305: packet_start(success ?
1306: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1307: packet_put_int(c->remote_id);
1308: packet_send();
1309: }
1310: xfree(rtype);
1311: }
1.95 markus 1312: static void
1313: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1314: {
1315: char *rtype;
1316: int want_reply;
1317: int success = 0;
1318:
1319: rtype = packet_get_string(NULL);
1320: want_reply = packet_get_char();
1321: debug("client_input_global_request: rtype %s want_reply %d", rtype, want_reply);
1322: if (want_reply) {
1323: packet_start(success ?
1324: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1325: packet_send();
1326: packet_write_wait();
1327: }
1328: xfree(rtype);
1329: }
1.22 markus 1330:
1.77 itojun 1331: static void
1.49 itojun 1332: client_init_dispatch_20(void)
1.16 markus 1333: {
1.55 markus 1334: dispatch_init(&dispatch_protocol_error);
1.100 markus 1335:
1.16 markus 1336: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1337: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1338: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1339: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1340: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1341: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1342: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1343: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1344: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1345: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1346:
1347: /* rekeying */
1348: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1349:
1350: /* global request reply messages */
1351: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1352: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1353: }
1.77 itojun 1354: static void
1.49 itojun 1355: client_init_dispatch_13(void)
1.15 markus 1356: {
1357: dispatch_init(NULL);
1358: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1359: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1360: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1361: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1362: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1363: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1364: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1365: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1366: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1367:
1368: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1369: &auth_input_open_request : &deny_input_open);
1370: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1371: &x11_input_open : &deny_input_open);
1.15 markus 1372: }
1.77 itojun 1373: static void
1.49 itojun 1374: client_init_dispatch_15(void)
1.15 markus 1375: {
1376: client_init_dispatch_13();
1377: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1378: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1379: }
1.79 stevesk 1380: static void
1.49 itojun 1381: client_init_dispatch(void)
1.15 markus 1382: {
1.16 markus 1383: if (compat20)
1384: client_init_dispatch_20();
1385: else if (compat13)
1.15 markus 1386: client_init_dispatch_13();
1387: else
1388: client_init_dispatch_15();
1.1 deraadt 1389: }
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