Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.105
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"
1.105 ! markus 62: RCSID("$OpenBSD: clientloop.c,v 1.104 2002/08/22 19:38:42 stevesk 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')) {
1.99 markus 493: log("Invalid command.");
1.97 jakob 494: goto out;
495: }
496: if (s[1] == 'L')
497: local = 1;
498: if (!local && !compat20) {
1.99 markus 499: log("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) {
1.99 markus 510: log("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) {
1.99 markus 515: log("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) {
521: log("Port forwarding failed.");
1.97 jakob 522: goto out;
523: }
524: } else
525: channel_request_remote_forwarding(fwd_port, buf,
526: fwd_host_port);
1.99 markus 527: log("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:
1.54 markus 577: case 'R':
1.59 markus 578: if (compat20) {
579: if (datafellows & SSH_BUG_NOREKEY)
580: log("Server does not support re-keying");
581: else
582: need_rekeying = 1;
583: }
1.54 markus 584: continue;
585:
1.31 markus 586: case '&':
587: /*
588: * Detach the program (continue to serve connections,
589: * but put in background and no more new connections).
590: */
591: /* Restore tty modes. */
592: leave_raw_mode();
593:
594: /* Stop listening for new connections. */
1.86 markus 595: channel_stop_listening();
1.31 markus 596:
1.86 markus 597: snprintf(string, sizeof string,
598: "%c& [backgrounded]\n", escape_char);
599: buffer_append(berr, string, strlen(string));
1.31 markus 600:
601: /* Fork into background. */
602: pid = fork();
603: if (pid < 0) {
604: error("fork: %.100s", strerror(errno));
605: continue;
606: }
607: if (pid != 0) { /* This is the parent. */
608: /* The parent just exits. */
609: exit(0);
610: }
611: /* The child continues serving connections. */
1.86 markus 612: if (compat20) {
613: buffer_append(bin, "\004", 1);
614: /* fake EOF on stdin */
615: return -1;
616: } else if (!stdin_eof) {
617: /*
618: * Sending SSH_CMSG_EOF alone does not always appear
619: * to be enough. So we try to send an EOF character
620: * first.
621: */
622: packet_start(SSH_CMSG_STDIN_DATA);
623: packet_put_string("\004", 1);
624: packet_send();
625: /* Close stdin. */
626: stdin_eof = 1;
627: if (buffer_len(bin) == 0) {
628: packet_start(SSH_CMSG_EOF);
629: packet_send();
630: }
631: }
632: continue;
1.31 markus 633:
634: case '?':
1.32 markus 635: snprintf(string, sizeof string,
1.31 markus 636: "%c?\r\n\
637: Supported escape sequences:\r\n\
1.104 stevesk 638: %c. - terminate connection\r\n\
639: %cC - open a command line\r\n\
640: %cR - Request rekey (SSH protocol 2 only)\r\n\
641: %c^Z - suspend ssh\r\n\
642: %c# - list forwarded connections\r\n\
643: %c& - background ssh (when waiting for connections to terminate)\r\n\
644: %c? - this message\r\n\
645: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 646: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 647: escape_char, escape_char, escape_char, escape_char,
648: escape_char, escape_char, escape_char, escape_char,
649: escape_char, escape_char);
1.32 markus 650: buffer_append(berr, string, strlen(string));
1.31 markus 651: continue;
652:
653: case '#':
1.32 markus 654: snprintf(string, sizeof string, "%c#\r\n", escape_char);
655: buffer_append(berr, string, strlen(string));
1.31 markus 656: s = channel_open_message();
657: buffer_append(berr, s, strlen(s));
658: xfree(s);
1.97 jakob 659: continue;
660:
661: case 'C':
1.99 markus 662: process_cmdline();
1.31 markus 663: continue;
664:
665: default:
666: if (ch != escape_char) {
667: buffer_put_char(bin, escape_char);
668: bytes++;
669: }
670: /* Escaped characters fall through here */
671: break;
672: }
673: } else {
674: /*
675: * The previous character was not an escape char. Check if this
676: * is an escape.
677: */
678: if (last_was_cr && ch == escape_char) {
679: /* It is. Set the flag and continue to next character. */
680: escape_pending = 1;
681: continue;
682: }
683: }
684:
685: /*
686: * Normal character. Record whether it was a newline,
687: * and append it to the buffer.
688: */
689: last_was_cr = (ch == '\r' || ch == '\n');
690: buffer_put_char(bin, ch);
691: bytes++;
692: }
693: return bytes;
694: }
695:
1.77 itojun 696: static void
1.17 markus 697: client_process_input(fd_set * readset)
698: {
1.21 deraadt 699: int len;
1.31 markus 700: char buf[8192];
1.16 markus 701:
1.11 markus 702: /* Read input from stdin. */
703: if (FD_ISSET(fileno(stdin), readset)) {
704: /* Read as much as possible. */
705: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 706: if (len < 0 && (errno == EAGAIN || errno == EINTR))
707: return; /* we'll try again later */
1.11 markus 708: if (len <= 0) {
1.13 markus 709: /*
710: * Received EOF or error. They are treated
711: * similarly, except that an error message is printed
712: * if it was an error condition.
713: */
1.11 markus 714: if (len < 0) {
715: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
716: buffer_append(&stderr_buffer, buf, strlen(buf));
717: }
718: /* Mark that we have seen EOF. */
719: stdin_eof = 1;
1.13 markus 720: /*
721: * Send an EOF message to the server unless there is
722: * data in the buffer. If there is data in the
723: * buffer, no message will be sent now. Code
724: * elsewhere will send the EOF when the buffer
725: * becomes empty if stdin_eof is set.
726: */
1.11 markus 727: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 728: packet_start(SSH_CMSG_EOF);
729: packet_send();
1.11 markus 730: }
1.72 stevesk 731: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 732: /*
733: * Normal successful read, and no escape character.
734: * Just append the data to buffer.
735: */
1.11 markus 736: buffer_append(&stdin_buffer, buf, len);
737: } else {
1.13 markus 738: /*
739: * Normal, successful read. But we have an escape character
740: * and have to process the characters one by one.
741: */
1.52 markus 742: if (process_escapes(&stdin_buffer, &stdout_buffer,
743: &stderr_buffer, buf, len) == -1)
1.31 markus 744: return;
1.11 markus 745: }
746: }
747: }
748:
1.77 itojun 749: static void
1.11 markus 750: client_process_output(fd_set * writeset)
751: {
752: int len;
753: char buf[100];
1.1 deraadt 754:
1.11 markus 755: /* Write buffered output to stdout. */
756: if (FD_ISSET(fileno(stdout), writeset)) {
757: /* Write as much data as possible. */
758: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 759: buffer_len(&stdout_buffer));
1.11 markus 760: if (len <= 0) {
1.64 markus 761: if (errno == EINTR || errno == EAGAIN)
1.11 markus 762: len = 0;
763: else {
1.13 markus 764: /*
765: * An error or EOF was encountered. Put an
766: * error message to stderr buffer.
767: */
1.11 markus 768: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
769: buffer_append(&stderr_buffer, buf, strlen(buf));
770: quit_pending = 1;
771: return;
772: }
773: }
774: /* Consume printed data from the buffer. */
775: buffer_consume(&stdout_buffer, len);
1.57 markus 776: stdout_bytes += len;
1.11 markus 777: }
778: /* Write buffered output to stderr. */
779: if (FD_ISSET(fileno(stderr), writeset)) {
780: /* Write as much data as possible. */
781: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 782: buffer_len(&stderr_buffer));
1.11 markus 783: if (len <= 0) {
1.64 markus 784: if (errno == EINTR || errno == EAGAIN)
1.11 markus 785: len = 0;
786: else {
1.13 markus 787: /* EOF or error, but can't even print error message. */
1.11 markus 788: quit_pending = 1;
789: return;
790: }
791: }
792: /* Consume printed characters from the buffer. */
793: buffer_consume(&stderr_buffer, len);
1.57 markus 794: stderr_bytes += len;
1.11 markus 795: }
1.1 deraadt 796: }
797:
1.13 markus 798: /*
1.15 markus 799: * Get packets from the connection input buffer, and process them as long as
800: * there are packets available.
801: *
802: * Any unknown packets received during the actual
803: * session cause the session to terminate. This is
804: * intended to make debugging easier since no
805: * confirmations are sent. Any compatible protocol
806: * extensions must be negotiated during the
807: * preparatory phase.
808: */
809:
1.77 itojun 810: static void
1.49 itojun 811: client_process_buffered_input_packets(void)
1.15 markus 812: {
1.54 markus 813: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 814: }
815:
1.31 markus 816: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 817:
1.77 itojun 818: static int
1.31 markus 819: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 820: {
1.31 markus 821: /* XXX we assume c->extended is writeable */
822: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 823: }
824:
1.77 itojun 825: static void
1.60 markus 826: client_channel_closed(int id, void *arg)
827: {
828: if (id != session_ident)
829: error("client_channel_closed: id %d != session_ident %d",
830: id, session_ident);
1.83 markus 831: channel_cancel_cleanup(id);
1.60 markus 832: session_closed = 1;
1.62 stevesk 833: if (in_raw_mode())
1.61 markus 834: leave_raw_mode();
1.60 markus 835: }
836:
1.15 markus 837: /*
1.13 markus 838: * Implements the interactive session with the server. This is called after
839: * the user has been authenticated, and a command has been started on the
1.72 stevesk 840: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
841: * used as an escape character for terminating or suspending the session.
1.13 markus 842: */
1.1 deraadt 843:
1.20 markus 844: int
1.30 markus 845: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 846: {
1.46 markus 847: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 848: double start_time, total_time;
1.81 markus 849: int max_fd = 0, max_fd2 = 0, len, rekeying = 0, nalloc = 0;
1.11 markus 850: char buf[100];
851:
852: debug("Entering interactive session.");
853:
854: start_time = get_current_time();
855:
856: /* Initialize variables. */
857: escape_pending = 0;
858: last_was_cr = 1;
859: exit_status = -1;
860: stdin_eof = 0;
861: buffer_high = 64 * 1024;
862: connection_in = packet_get_connection_in();
863: connection_out = packet_get_connection_out();
1.46 markus 864: max_fd = MAX(connection_in, connection_out);
865:
866: if (!compat20) {
1.63 markus 867: /* enable nonblocking unless tty */
868: if (!isatty(fileno(stdin)))
869: set_nonblock(fileno(stdin));
870: if (!isatty(fileno(stdout)))
871: set_nonblock(fileno(stdout));
872: if (!isatty(fileno(stderr)))
873: set_nonblock(fileno(stderr));
1.46 markus 874: max_fd = MAX(max_fd, fileno(stdin));
875: max_fd = MAX(max_fd, fileno(stdout));
876: max_fd = MAX(max_fd, fileno(stderr));
877: }
1.11 markus 878: stdin_bytes = 0;
879: stdout_bytes = 0;
880: stderr_bytes = 0;
881: quit_pending = 0;
882: escape_char = escape_char_arg;
883:
884: /* Initialize buffers. */
885: buffer_init(&stdin_buffer);
886: buffer_init(&stdout_buffer);
887: buffer_init(&stderr_buffer);
888:
1.15 markus 889: client_init_dispatch();
890:
1.105 ! markus 891: /*
! 892: * Set signal handlers, (e.g. to restore non-blocking mode)
! 893: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
! 894: */
! 895: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
! 896: signal(SIGINT, signal_handler);
! 897: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
! 898: signal(SIGQUIT, signal_handler);
! 899: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
! 900: signal(SIGTERM, signal_handler);
1.11 markus 901: if (have_pty)
902: signal(SIGWINCH, window_change_handler);
903:
904: if (have_pty)
905: enter_raw_mode();
906:
1.48 markus 907: if (compat20) {
908: session_ident = ssh2_chan_id;
1.72 stevesk 909: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 910: channel_register_filter(session_ident,
911: simple_escape_filter);
1.60 markus 912: if (session_ident != -1)
913: channel_register_cleanup(session_ident,
914: client_channel_closed);
1.48 markus 915: } else {
916: /* Check if we should immediately send eof on stdin. */
1.16 markus 917: client_check_initial_eof_on_stdin();
1.48 markus 918: }
1.30 markus 919:
1.11 markus 920: /* Main loop of the client for the interactive session mode. */
921: while (!quit_pending) {
922:
1.13 markus 923: /* Process buffered packets sent by the server. */
1.11 markus 924: client_process_buffered_input_packets();
925:
1.60 markus 926: if (compat20 && session_closed && !channel_still_open())
927: break;
928:
1.56 markus 929: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 930:
1.56 markus 931: if (rekeying) {
932: debug("rekeying in progress");
933: } else {
934: /*
935: * Make packets of buffered stdin data, and buffer
936: * them for sending to the server.
937: */
938: if (!compat20)
939: client_make_packets_from_stdin_data();
1.11 markus 940:
1.56 markus 941: /*
942: * Make packets from buffered channel data, and
943: * enqueue them for sending to the server.
944: */
945: if (packet_not_very_much_data_to_write())
946: channel_output_poll();
1.11 markus 947:
1.56 markus 948: /*
949: * Check if the window size has changed, and buffer a
950: * message about it to the server if so.
951: */
952: client_check_window_change();
1.11 markus 953:
1.56 markus 954: if (quit_pending)
955: break;
956: }
1.13 markus 957: /*
958: * Wait until we have something to do (something becomes
959: * available on one of the descriptors).
960: */
1.81 markus 961: max_fd2 = max_fd;
1.56 markus 962: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 963: &max_fd2, &nalloc, rekeying);
1.11 markus 964:
965: if (quit_pending)
966: break;
967:
1.56 markus 968: /* Do channel operations unless rekeying in progress. */
969: if (!rekeying) {
970: channel_after_select(readset, writeset);
971:
972: if (need_rekeying) {
973: debug("user requests rekeying");
974: xxx_kex->done = 0;
975: kex_send_kexinit(xxx_kex);
976: need_rekeying = 0;
977: }
978: }
1.11 markus 979:
1.17 markus 980: /* Buffer input from the connection. */
1.46 markus 981: client_process_net_input(readset);
1.17 markus 982:
983: if (quit_pending)
984: break;
1.11 markus 985:
1.17 markus 986: if (!compat20) {
987: /* Buffer data from stdin */
1.46 markus 988: client_process_input(readset);
1.17 markus 989: /*
990: * Process output to stdout and stderr. Output to
991: * the connection is processed elsewhere (above).
992: */
1.46 markus 993: client_process_output(writeset);
1.17 markus 994: }
1.11 markus 995:
1.13 markus 996: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 997: if (FD_ISSET(connection_out, writeset))
1.11 markus 998: packet_write_poll();
999: }
1.46 markus 1000: if (readset)
1001: xfree(readset);
1002: if (writeset)
1003: xfree(writeset);
1.11 markus 1004:
1005: /* Terminate the session. */
1006:
1007: /* Stop watching for window change. */
1008: if (have_pty)
1009: signal(SIGWINCH, SIG_DFL);
1010:
1.76 markus 1011: channel_free_all();
1.11 markus 1012:
1.75 markus 1013: if (have_pty)
1014: leave_raw_mode();
1015:
1016: /* restore blocking io */
1017: if (!isatty(fileno(stdin)))
1018: unset_nonblock(fileno(stdin));
1019: if (!isatty(fileno(stdout)))
1020: unset_nonblock(fileno(stdout));
1021: if (!isatty(fileno(stderr)))
1022: unset_nonblock(fileno(stderr));
1023:
1024: if (received_signal) {
1025: if (in_non_blocking_mode) /* XXX */
1026: leave_non_blocking();
1.89 itojun 1027: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1028: }
1029:
1.13 markus 1030: /*
1031: * In interactive mode (with pseudo tty) display a message indicating
1032: * that the connection has been closed.
1033: */
1.11 markus 1034: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1035: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1036: buffer_append(&stderr_buffer, buf, strlen(buf));
1037: }
1.70 markus 1038:
1.11 markus 1039: /* Output any buffered data for stdout. */
1.70 markus 1040: while (buffer_len(&stdout_buffer) > 0) {
1041: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1042: buffer_len(&stdout_buffer));
1.70 markus 1043: if (len <= 0) {
1.11 markus 1044: error("Write failed flushing stdout buffer.");
1.70 markus 1045: break;
1046: }
1.11 markus 1047: buffer_consume(&stdout_buffer, len);
1.57 markus 1048: stdout_bytes += len;
1.11 markus 1049: }
1050:
1051: /* Output any buffered data for stderr. */
1.70 markus 1052: while (buffer_len(&stderr_buffer) > 0) {
1053: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1054: buffer_len(&stderr_buffer));
1.70 markus 1055: if (len <= 0) {
1.11 markus 1056: error("Write failed flushing stderr buffer.");
1.70 markus 1057: break;
1058: }
1.11 markus 1059: buffer_consume(&stderr_buffer, len);
1.57 markus 1060: stderr_bytes += len;
1.11 markus 1061: }
1062:
1063: /* Clear and free any buffers. */
1064: memset(buf, 0, sizeof(buf));
1065: buffer_free(&stdin_buffer);
1066: buffer_free(&stdout_buffer);
1067: buffer_free(&stderr_buffer);
1068:
1069: /* Report bytes transferred, and transfer rates. */
1070: total_time = get_current_time() - start_time;
1071: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1072: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1073: if (total_time > 0)
1074: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1075: stdin_bytes / total_time, stdout_bytes / total_time,
1076: stderr_bytes / total_time);
1.11 markus 1077:
1078: /* Return the exit status of the program. */
1079: debug("Exit status %d", exit_status);
1080: return exit_status;
1.15 markus 1081: }
1082:
1083: /*********/
1084:
1.77 itojun 1085: static void
1.94 markus 1086: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1087: {
1.42 markus 1088: u_int data_len;
1.15 markus 1089: char *data = packet_get_string(&data_len);
1.93 markus 1090: packet_check_eom();
1.15 markus 1091: buffer_append(&stdout_buffer, data, data_len);
1092: memset(data, 0, data_len);
1093: xfree(data);
1094: }
1.77 itojun 1095: static void
1.94 markus 1096: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1097: {
1.42 markus 1098: u_int data_len;
1.15 markus 1099: char *data = packet_get_string(&data_len);
1.93 markus 1100: packet_check_eom();
1.15 markus 1101: buffer_append(&stderr_buffer, data, data_len);
1102: memset(data, 0, data_len);
1103: xfree(data);
1104: }
1.77 itojun 1105: static void
1.94 markus 1106: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1107: {
1108: exit_status = packet_get_int();
1.93 markus 1109: packet_check_eom();
1.15 markus 1110: /* Acknowledge the exit. */
1111: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1112: packet_send();
1113: /*
1114: * Must wait for packet to be sent since we are
1115: * exiting the loop.
1116: */
1117: packet_write_wait();
1118: /* Flag that we want to exit. */
1119: quit_pending = 1;
1120: }
1121:
1.77 itojun 1122: static Channel *
1.40 markus 1123: client_request_forwarded_tcpip(const char *request_type, int rchan)
1124: {
1.103 deraadt 1125: Channel *c = NULL;
1.40 markus 1126: char *listen_address, *originator_address;
1127: int listen_port, originator_port;
1.67 markus 1128: int sock;
1.40 markus 1129:
1130: /* Get rest of the packet */
1131: listen_address = packet_get_string(NULL);
1132: listen_port = packet_get_int();
1133: originator_address = packet_get_string(NULL);
1134: originator_port = packet_get_int();
1.93 markus 1135: packet_check_eom();
1.40 markus 1136:
1137: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1138: listen_address, listen_port, originator_address, originator_port);
1139:
1.80 stevesk 1140: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1141: if (sock < 0) {
1142: xfree(originator_address);
1143: xfree(listen_address);
1144: return NULL;
1145: }
1146: c = channel_new("forwarded-tcpip",
1147: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1148: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1149: xstrdup(originator_address), 1);
1.40 markus 1150: xfree(originator_address);
1151: xfree(listen_address);
1152: return c;
1153: }
1154:
1.103 deraadt 1155: static Channel *
1.40 markus 1156: client_request_x11(const char *request_type, int rchan)
1157: {
1158: Channel *c = NULL;
1159: char *originator;
1160: int originator_port;
1.67 markus 1161: int sock;
1.40 markus 1162:
1163: if (!options.forward_x11) {
1164: error("Warning: ssh server tried X11 forwarding.");
1165: error("Warning: this is probably a break in attempt by a malicious server.");
1166: return NULL;
1167: }
1168: originator = packet_get_string(NULL);
1169: if (datafellows & SSH_BUG_X11FWD) {
1170: debug2("buggy server: x11 request w/o originator_port");
1171: originator_port = 0;
1172: } else {
1173: originator_port = packet_get_int();
1174: }
1.93 markus 1175: packet_check_eom();
1.40 markus 1176: /* XXX check permission */
1.47 markus 1177: debug("client_request_x11: request from %s %d", originator,
1178: originator_port);
1.67 markus 1179: xfree(originator);
1.40 markus 1180: sock = x11_connect_display();
1.67 markus 1181: if (sock < 0)
1182: return NULL;
1183: c = channel_new("x11",
1184: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1185: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0,
1186: xstrdup("x11"), 1);
1.82 markus 1187: c->force_drain = 1;
1.40 markus 1188: return c;
1189: }
1190:
1.103 deraadt 1191: static Channel *
1.40 markus 1192: client_request_agent(const char *request_type, int rchan)
1193: {
1194: Channel *c = NULL;
1.67 markus 1195: int sock;
1.40 markus 1196:
1197: if (!options.forward_agent) {
1198: error("Warning: ssh server tried agent forwarding.");
1199: error("Warning: this is probably a break in attempt by a malicious server.");
1200: return NULL;
1201: }
1202: sock = ssh_get_authentication_socket();
1.67 markus 1203: if (sock < 0)
1204: return NULL;
1205: c = channel_new("authentication agent connection",
1206: SSH_CHANNEL_OPEN, sock, sock, -1,
1207: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1208: xstrdup("authentication agent connection"), 1);
1.82 markus 1209: c->force_drain = 1;
1.40 markus 1210: return c;
1211: }
1212:
1.22 markus 1213: /* XXXX move to generic input handler */
1.77 itojun 1214: static void
1.94 markus 1215: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1216: {
1217: Channel *c = NULL;
1218: char *ctype;
1219: int rchan;
1.102 markus 1220: u_int rmaxpack, rwindow, len;
1.22 markus 1221:
1222: ctype = packet_get_string(&len);
1223: rchan = packet_get_int();
1224: rwindow = packet_get_int();
1225: rmaxpack = packet_get_int();
1226:
1.24 markus 1227: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1228: ctype, rchan, rwindow, rmaxpack);
1229:
1.40 markus 1230: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1231: c = client_request_forwarded_tcpip(ctype, rchan);
1232: } else if (strcmp(ctype, "x11") == 0) {
1233: c = client_request_x11(ctype, rchan);
1234: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1235: c = client_request_agent(ctype, rchan);
1.22 markus 1236: }
1237: /* XXX duplicate : */
1238: if (c != NULL) {
1239: debug("confirm %s", ctype);
1240: c->remote_id = rchan;
1241: c->remote_window = rwindow;
1242: c->remote_maxpacket = rmaxpack;
1.69 markus 1243: if (c->type != SSH_CHANNEL_CONNECTING) {
1244: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1245: packet_put_int(c->remote_id);
1246: packet_put_int(c->self);
1247: packet_put_int(c->local_window);
1248: packet_put_int(c->local_maxpacket);
1249: packet_send();
1250: }
1.22 markus 1251: } else {
1252: debug("failure %s", ctype);
1253: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1254: packet_put_int(rchan);
1255: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1256: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1257: packet_put_cstring("open failed");
1.66 markus 1258: packet_put_cstring("");
1259: }
1.22 markus 1260: packet_send();
1261: }
1262: xfree(ctype);
1263: }
1.77 itojun 1264: static void
1.94 markus 1265: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1266: {
1267: Channel *c = NULL;
1268: int id, reply, success = 0;
1269: char *rtype;
1270:
1271: id = packet_get_int();
1272: rtype = packet_get_string(NULL);
1273: reply = packet_get_char();
1274:
1275: debug("client_input_channel_req: channel %d rtype %s reply %d",
1276: id, rtype, reply);
1277:
1278: if (session_ident == -1) {
1279: error("client_input_channel_req: no channel %d", session_ident);
1280: } else if (id != session_ident) {
1281: error("client_input_channel_req: channel %d: wrong channel: %d",
1282: session_ident, id);
1283: }
1284: c = channel_lookup(id);
1285: if (c == NULL) {
1286: error("client_input_channel_req: channel %d: unknown channel", id);
1287: } else if (strcmp(rtype, "exit-status") == 0) {
1288: success = 1;
1289: exit_status = packet_get_int();
1.93 markus 1290: packet_check_eom();
1.48 markus 1291: }
1292: if (reply) {
1293: packet_start(success ?
1294: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1295: packet_put_int(c->remote_id);
1296: packet_send();
1297: }
1298: xfree(rtype);
1299: }
1.95 markus 1300: static void
1301: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1302: {
1303: char *rtype;
1304: int want_reply;
1305: int success = 0;
1306:
1307: rtype = packet_get_string(NULL);
1308: want_reply = packet_get_char();
1309: debug("client_input_global_request: rtype %s want_reply %d", rtype, want_reply);
1310: if (want_reply) {
1311: packet_start(success ?
1312: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1313: packet_send();
1314: packet_write_wait();
1315: }
1316: xfree(rtype);
1317: }
1.22 markus 1318:
1.77 itojun 1319: static void
1.49 itojun 1320: client_init_dispatch_20(void)
1.16 markus 1321: {
1.55 markus 1322: dispatch_init(&dispatch_protocol_error);
1.100 markus 1323:
1.16 markus 1324: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1325: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1326: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1327: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1328: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1329: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1330: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1331: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1332: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1333: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1334:
1335: /* rekeying */
1336: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1337:
1338: /* global request reply messages */
1339: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1340: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1341: }
1.77 itojun 1342: static void
1.49 itojun 1343: client_init_dispatch_13(void)
1.15 markus 1344: {
1345: dispatch_init(NULL);
1346: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1347: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1348: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1349: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1350: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1351: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1352: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1353: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1354: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1355:
1356: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1357: &auth_input_open_request : &deny_input_open);
1358: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1359: &x11_input_open : &deny_input_open);
1.15 markus 1360: }
1.77 itojun 1361: static void
1.49 itojun 1362: client_init_dispatch_15(void)
1.15 markus 1363: {
1364: client_init_dispatch_13();
1365: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1366: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1367: }
1.79 stevesk 1368: static void
1.49 itojun 1369: client_init_dispatch(void)
1.15 markus 1370: {
1.16 markus 1371: if (compat20)
1372: client_init_dispatch_20();
1373: else if (compat13)
1.15 markus 1374: client_init_dispatch_13();
1375: else
1376: client_init_dispatch_15();
1.1 deraadt 1377: }