Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.151
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"
1.151 ! stevesk 62: RCSID("$OpenBSD: clientloop.c,v 1.150 2006/02/07 01:42:00 stevesk Exp $");
1.150 stevesk 63:
1.151 ! stevesk 64: #include <paths.h>
1.150 stevesk 65: #include <termios.h>
1.1 deraadt 66:
1.45 markus 67: #include "ssh.h"
68: #include "ssh1.h"
69: #include "ssh2.h"
1.1 deraadt 70: #include "xmalloc.h"
71: #include "packet.h"
72: #include "buffer.h"
1.15 markus 73: #include "compat.h"
1.74 markus 74: #include "channels.h"
1.15 markus 75: #include "dispatch.h"
1.30 markus 76: #include "buffer.h"
77: #include "bufaux.h"
1.40 markus 78: #include "key.h"
1.54 markus 79: #include "kex.h"
1.45 markus 80: #include "log.h"
81: #include "readconf.h"
82: #include "clientloop.h"
1.147 djm 83: #include "sshconnect.h"
1.40 markus 84: #include "authfd.h"
1.45 markus 85: #include "atomicio.h"
1.118 deraadt 86: #include "sshpty.h"
1.63 markus 87: #include "misc.h"
1.123 djm 88: #include "monitor_fdpass.h"
89: #include "match.h"
90: #include "msg.h"
1.39 markus 91:
92: /* import options */
93: extern Options options;
94:
1.1 deraadt 95: /* Flag indicating that stdin should be redirected from /dev/null. */
96: extern int stdin_null_flag;
97:
1.116 dtucker 98: /* Flag indicating that no shell has been requested */
99: extern int no_shell_flag;
100:
1.123 djm 101: /* Control socket */
102: extern int control_fd;
103:
1.13 markus 104: /*
105: * Name of the host we are connecting to. This is the name given on the
106: * command line, or the HostName specified for the user-supplied name in a
107: * configuration file.
108: */
1.1 deraadt 109: extern char *host;
110:
1.13 markus 111: /*
112: * Flag to indicate that we have received a window change signal which has
113: * not yet been processed. This will cause a message indicating the new
114: * window size to be sent to the server a little later. This is volatile
115: * because this is updated in a signal handler.
116: */
1.88 markus 117: static volatile sig_atomic_t received_window_change_signal = 0;
118: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 119:
1.145 djm 120: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 121: static int in_non_blocking_mode = 0;
122:
123: /* Common data for the client loop code. */
1.31 markus 124: static int quit_pending; /* Set to non-zero to quit the client loop. */
125: static int escape_char; /* Escape character. */
1.11 markus 126: static int escape_pending; /* Last character was the escape character */
127: static int last_was_cr; /* Last character was a newline. */
128: static int exit_status; /* Used to store the exit status of the command. */
129: static int stdin_eof; /* EOF has been encountered on standard error. */
130: static Buffer stdin_buffer; /* Buffer for stdin data. */
131: static Buffer stdout_buffer; /* Buffer for stdout data. */
132: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 133: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
134: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 135: static int connection_in; /* Connection to server (input). */
136: static int connection_out; /* Connection to server (output). */
1.56 markus 137: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 138: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 139: static int server_alive_timeouts = 0;
1.1 deraadt 140:
1.77 itojun 141: static void client_init_dispatch(void);
1.16 markus 142: int session_ident = -1;
143:
1.123 djm 144: struct confirm_ctx {
145: int want_tty;
146: int want_subsys;
1.140 djm 147: int want_x_fwd;
148: int want_agent_fwd;
1.123 djm 149: Buffer cmd;
150: char *term;
151: struct termios tio;
1.126 djm 152: char **env;
1.123 djm 153: };
154:
1.54 markus 155: /*XXX*/
156: extern Kex *xxx_kex;
157:
1.123 djm 158: void ssh_process_session2_setup(int, int, int, Buffer *);
159:
1.1 deraadt 160: /* Restores stdin to blocking mode. */
161:
1.77 itojun 162: static void
1.49 itojun 163: leave_non_blocking(void)
1.1 deraadt 164: {
1.11 markus 165: if (in_non_blocking_mode) {
1.125 djm 166: unset_nonblock(fileno(stdin));
1.11 markus 167: in_non_blocking_mode = 0;
168: }
1.1 deraadt 169: }
170:
1.11 markus 171: /* Puts stdin terminal in non-blocking mode. */
172:
1.77 itojun 173: static void
1.49 itojun 174: enter_non_blocking(void)
1.1 deraadt 175: {
1.11 markus 176: in_non_blocking_mode = 1;
1.124 djm 177: set_nonblock(fileno(stdin));
1.1 deraadt 178: }
179:
1.13 markus 180: /*
181: * Signal handler for the window change signal (SIGWINCH). This just sets a
182: * flag indicating that the window has changed.
183: */
1.1 deraadt 184:
1.77 itojun 185: static void
1.11 markus 186: window_change_handler(int sig)
1.1 deraadt 187: {
1.11 markus 188: received_window_change_signal = 1;
189: signal(SIGWINCH, window_change_handler);
1.1 deraadt 190: }
191:
1.13 markus 192: /*
193: * Signal handler for signals that cause the program to terminate. These
194: * signals must be trapped to restore terminal modes.
195: */
1.1 deraadt 196:
1.77 itojun 197: static void
1.11 markus 198: signal_handler(int sig)
1.1 deraadt 199: {
1.75 markus 200: received_signal = sig;
201: quit_pending = 1;
1.1 deraadt 202: }
203:
1.13 markus 204: /*
205: * Returns current time in seconds from Jan 1, 1970 with the maximum
206: * available resolution.
207: */
1.1 deraadt 208:
1.77 itojun 209: static double
1.49 itojun 210: get_current_time(void)
1.1 deraadt 211: {
1.11 markus 212: struct timeval tv;
213: gettimeofday(&tv, NULL);
214: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 215: }
216:
217: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
218: void
219: client_x11_get_proto(const char *display, const char *xauth_path,
220: u_int trusted, char **_proto, char **_data)
221: {
222: char cmd[1024];
223: char line[512];
224: char xdisplay[512];
225: static char proto[512], data[512];
226: FILE *f;
227: int got_data = 0, generated = 0, do_unlink = 0, i;
228: char *xauthdir, *xauthfile;
229: struct stat st;
230:
231: xauthdir = xauthfile = NULL;
232: *_proto = proto;
233: *_data = data;
234: proto[0] = data[0] = '\0';
235:
236: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
237: debug("No xauth program.");
238: } else {
239: if (display == NULL) {
240: debug("x11_get_proto: DISPLAY not set");
241: return;
242: }
243: /*
244: * Handle FamilyLocal case where $DISPLAY does
245: * not match an authorization entry. For this we
246: * just try "xauth list unix:displaynum.screennum".
247: * XXX: "localhost" match to determine FamilyLocal
248: * is not perfect.
249: */
250: if (strncmp(display, "localhost:", 10) == 0) {
251: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
252: display + 10);
253: display = xdisplay;
254: }
255: if (trusted == 0) {
256: xauthdir = xmalloc(MAXPATHLEN);
257: xauthfile = xmalloc(MAXPATHLEN);
258: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
259: if (mkdtemp(xauthdir) != NULL) {
260: do_unlink = 1;
261: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
262: xauthdir);
263: snprintf(cmd, sizeof(cmd),
264: "%s -f %s generate %s " SSH_X11_PROTO
265: " untrusted timeout 1200 2>" _PATH_DEVNULL,
266: xauth_path, xauthfile, display);
267: debug2("x11_get_proto: %s", cmd);
268: if (system(cmd) == 0)
269: generated = 1;
270: }
271: }
272: snprintf(cmd, sizeof(cmd),
1.142 markus 273: "%s %s%s list %s 2>" _PATH_DEVNULL,
1.138 djm 274: xauth_path,
275: generated ? "-f " : "" ,
276: generated ? xauthfile : "",
277: display);
278: debug2("x11_get_proto: %s", cmd);
279: f = popen(cmd, "r");
280: if (f && fgets(line, sizeof(line), f) &&
281: sscanf(line, "%*s %511s %511s", proto, data) == 2)
282: got_data = 1;
283: if (f)
284: pclose(f);
285: }
286:
287: if (do_unlink) {
288: unlink(xauthfile);
289: rmdir(xauthdir);
290: }
291: if (xauthdir)
292: xfree(xauthdir);
293: if (xauthfile)
294: xfree(xauthfile);
295:
296: /*
297: * If we didn't get authentication data, just make up some
298: * data. The forwarding code will check the validity of the
299: * response anyway, and substitute this data. The X11
300: * server, however, will ignore this fake data and use
301: * whatever authentication mechanisms it was using otherwise
302: * for the local connection.
303: */
304: if (!got_data) {
305: u_int32_t rnd = 0;
306:
307: logit("Warning: No xauth data; "
308: "using fake authentication data for X11 forwarding.");
309: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
310: for (i = 0; i < 16; i++) {
311: if (i % 4 == 0)
312: rnd = arc4random();
313: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
314: rnd & 0xff);
315: rnd >>= 8;
316: }
317: }
1.1 deraadt 318: }
319:
1.13 markus 320: /*
321: * This is called when the interactive is entered. This checks if there is
322: * an EOF coming on stdin. We must check this explicitly, as select() does
323: * not appear to wake up when redirecting from /dev/null.
324: */
1.1 deraadt 325:
1.77 itojun 326: static void
1.49 itojun 327: client_check_initial_eof_on_stdin(void)
1.1 deraadt 328: {
1.11 markus 329: int len;
330: char buf[1];
1.1 deraadt 331:
1.13 markus 332: /*
333: * If standard input is to be "redirected from /dev/null", we simply
334: * mark that we have seen an EOF and send an EOF message to the
335: * server. Otherwise, we try to read a single character; it appears
336: * that for some files, such /dev/null, select() never wakes up for
337: * read for this descriptor, which means that we never get EOF. This
338: * way we will get the EOF if stdin comes from /dev/null or similar.
339: */
1.11 markus 340: if (stdin_null_flag) {
341: /* Fake EOF on stdin. */
342: debug("Sending eof.");
343: stdin_eof = 1;
344: packet_start(SSH_CMSG_EOF);
345: packet_send();
346: } else {
347: enter_non_blocking();
348:
349: /* Check for immediate EOF on stdin. */
350: len = read(fileno(stdin), buf, 1);
351: if (len == 0) {
1.13 markus 352: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 353: debug("Sending eof.");
354: stdin_eof = 1;
355: packet_start(SSH_CMSG_EOF);
356: packet_send();
357: } else if (len > 0) {
1.13 markus 358: /*
359: * Got data. We must store the data in the buffer,
360: * and also process it as an escape character if
361: * appropriate.
362: */
1.42 markus 363: if ((u_char) buf[0] == escape_char)
1.11 markus 364: escape_pending = 1;
1.52 markus 365: else
1.11 markus 366: buffer_append(&stdin_buffer, buf, 1);
367: }
368: leave_non_blocking();
369: }
1.1 deraadt 370: }
371:
372:
1.13 markus 373: /*
374: * Make packets from buffered stdin data, and buffer them for sending to the
375: * connection.
376: */
1.1 deraadt 377:
1.77 itojun 378: static void
1.49 itojun 379: client_make_packets_from_stdin_data(void)
1.1 deraadt 380: {
1.42 markus 381: u_int len;
1.1 deraadt 382:
1.11 markus 383: /* Send buffered stdin data to the server. */
384: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 385: packet_not_very_much_data_to_write()) {
1.11 markus 386: len = buffer_len(&stdin_buffer);
387: /* Keep the packets at reasonable size. */
388: if (len > packet_get_maxsize())
389: len = packet_get_maxsize();
390: packet_start(SSH_CMSG_STDIN_DATA);
391: packet_put_string(buffer_ptr(&stdin_buffer), len);
392: packet_send();
393: buffer_consume(&stdin_buffer, len);
1.52 markus 394: stdin_bytes += len;
1.11 markus 395: /* If we have a pending EOF, send it now. */
396: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
397: packet_start(SSH_CMSG_EOF);
398: packet_send();
399: }
1.1 deraadt 400: }
401: }
402:
1.13 markus 403: /*
404: * Checks if the client window has changed, and sends a packet about it to
405: * the server if so. The actual change is detected elsewhere (by a software
406: * interrupt on Unix); this just checks the flag and sends a message if
407: * appropriate.
408: */
1.1 deraadt 409:
1.77 itojun 410: static void
1.49 itojun 411: client_check_window_change(void)
1.1 deraadt 412: {
1.16 markus 413: struct winsize ws;
414:
415: if (! received_window_change_signal)
416: return;
417: /** XXX race */
418: received_window_change_signal = 0;
419:
1.37 markus 420: debug2("client_check_window_change: changed");
1.16 markus 421:
422: if (compat20) {
1.123 djm 423: channel_send_window_changes();
1.16 markus 424: } else {
1.123 djm 425: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
426: return;
1.16 markus 427: packet_start(SSH_CMSG_WINDOW_SIZE);
428: packet_put_int(ws.ws_row);
429: packet_put_int(ws.ws_col);
430: packet_put_int(ws.ws_xpixel);
431: packet_put_int(ws.ws_ypixel);
432: packet_send();
1.1 deraadt 433: }
434: }
435:
1.117 markus 436: static void
437: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
438: {
439: server_alive_timeouts = 0;
440: client_global_request_reply_fwd(type, seq, ctxt);
441: }
442:
443: static void
444: server_alive_check(void)
445: {
446: if (++server_alive_timeouts > options.server_alive_count_max)
447: packet_disconnect("Timeout, server not responding.");
448: packet_start(SSH2_MSG_GLOBAL_REQUEST);
449: packet_put_cstring("keepalive@openssh.com");
450: packet_put_char(1); /* boolean: want reply */
451: packet_send();
452: }
453:
1.13 markus 454: /*
455: * Waits until the client can do something (some data becomes available on
456: * one of the file descriptors).
457: */
1.77 itojun 458: static void
1.46 markus 459: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 460: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 461: {
1.117 markus 462: struct timeval tv, *tvp;
463: int ret;
464:
1.46 markus 465: /* Add any selections by the channel mechanism. */
1.81 markus 466: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 467:
1.16 markus 468: if (!compat20) {
1.17 markus 469: /* Read from the connection, unless our buffers are full. */
1.16 markus 470: if (buffer_len(&stdout_buffer) < buffer_high &&
471: buffer_len(&stderr_buffer) < buffer_high &&
472: channel_not_very_much_buffered_data())
1.46 markus 473: FD_SET(connection_in, *readsetp);
1.17 markus 474: /*
475: * Read from stdin, unless we have seen EOF or have very much
476: * buffered data to send to the server.
477: */
478: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 479: FD_SET(fileno(stdin), *readsetp);
1.17 markus 480:
481: /* Select stdout/stderr if have data in buffer. */
482: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 483: FD_SET(fileno(stdout), *writesetp);
1.17 markus 484: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 485: FD_SET(fileno(stderr), *writesetp);
1.16 markus 486: } else {
1.71 markus 487: /* channel_prepare_select could have closed the last channel */
1.84 markus 488: if (session_closed && !channel_still_open() &&
489: !packet_have_data_to_write()) {
490: /* clear mask since we did not call select() */
1.87 markus 491: memset(*readsetp, 0, *nallocp);
492: memset(*writesetp, 0, *nallocp);
1.84 markus 493: return;
1.71 markus 494: } else {
495: FD_SET(connection_in, *readsetp);
496: }
1.16 markus 497: }
1.11 markus 498:
499: /* Select server connection if have data to write to the server. */
500: if (packet_have_data_to_write())
1.46 markus 501: FD_SET(connection_out, *writesetp);
1.11 markus 502:
1.123 djm 503: if (control_fd != -1)
504: FD_SET(control_fd, *readsetp);
505:
1.13 markus 506: /*
507: * Wait for something to happen. This will suspend the process until
508: * some selected descriptor can be read, written, or has some other
1.117 markus 509: * event pending.
1.13 markus 510: */
1.11 markus 511:
1.117 markus 512: if (options.server_alive_interval == 0 || !compat20)
513: tvp = NULL;
1.129 deraadt 514: else {
1.117 markus 515: tv.tv_sec = options.server_alive_interval;
516: tv.tv_usec = 0;
517: tvp = &tv;
518: }
519: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
520: if (ret < 0) {
1.11 markus 521: char buf[100];
1.51 markus 522:
523: /*
524: * We have to clear the select masks, because we return.
525: * We have to return, because the mainloop checks for the flags
526: * set by the signal handlers.
527: */
1.87 markus 528: memset(*readsetp, 0, *nallocp);
529: memset(*writesetp, 0, *nallocp);
1.50 deraadt 530:
1.11 markus 531: if (errno == EINTR)
532: return;
533: /* Note: we might still have data in the buffers. */
534: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
535: buffer_append(&stderr_buffer, buf, strlen(buf));
536: quit_pending = 1;
1.117 markus 537: } else if (ret == 0)
538: server_alive_check();
1.11 markus 539: }
540:
1.77 itojun 541: static void
1.31 markus 542: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 543: {
1.11 markus 544: /* Flush stdout and stderr buffers. */
1.31 markus 545: if (buffer_len(bout) > 0)
1.112 deraadt 546: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 547: if (buffer_len(berr) > 0)
1.112 deraadt 548: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 549:
550: leave_raw_mode();
551:
1.13 markus 552: /*
553: * Free (and clear) the buffer to reduce the amount of data that gets
554: * written to swap.
555: */
1.31 markus 556: buffer_free(bin);
557: buffer_free(bout);
558: buffer_free(berr);
1.11 markus 559:
560: /* Send the suspend signal to the program itself. */
561: kill(getpid(), SIGTSTP);
562:
1.132 djm 563: /* Reset window sizes in case they have changed */
564: received_window_change_signal = 1;
1.11 markus 565:
566: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 567: buffer_init(bin);
568: buffer_init(bout);
569: buffer_init(berr);
1.11 markus 570:
571: enter_raw_mode();
572: }
573:
1.77 itojun 574: static void
1.17 markus 575: client_process_net_input(fd_set * readset)
1.11 markus 576: {
1.17 markus 577: int len;
578: char buf[8192];
1.11 markus 579:
1.13 markus 580: /*
581: * Read input from the server, and add any such data to the buffer of
582: * the packet subsystem.
583: */
1.11 markus 584: if (FD_ISSET(connection_in, readset)) {
585: /* Read as much as possible. */
586: len = read(connection_in, buf, sizeof(buf));
587: if (len == 0) {
588: /* Received EOF. The remote host has closed the connection. */
589: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
590: host);
1.1 deraadt 591: buffer_append(&stderr_buffer, buf, strlen(buf));
592: quit_pending = 1;
593: return;
1.11 markus 594: }
1.13 markus 595: /*
596: * There is a kernel bug on Solaris that causes select to
597: * sometimes wake up even though there is no data available.
598: */
1.53 millert 599: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 600: len = 0;
601:
602: if (len < 0) {
603: /* An error has encountered. Perhaps there is a network problem. */
604: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
605: host, strerror(errno));
606: buffer_append(&stderr_buffer, buf, strlen(buf));
607: quit_pending = 1;
608: return;
609: }
610: packet_process_incoming(buf, len);
611: }
1.17 markus 612: }
1.16 markus 613:
1.97 jakob 614: static void
1.123 djm 615: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
616: {
617: int id;
618: Channel *c;
1.129 deraadt 619:
1.123 djm 620: id = packet_get_int();
621: packet_check_eom();
622:
623: if ((c = channel_lookup(id)) == NULL) {
624: error("%s: no channel for id %d", __func__, id);
625: return;
626: }
627:
628: if (type == SSH2_MSG_CHANNEL_SUCCESS)
629: debug2("Request suceeded on channel %d", id);
630: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
631: error("Request failed on channel %d", id);
632: channel_free(c);
633: }
634: }
635:
636: static void
637: client_extra_session2_setup(int id, void *arg)
638: {
639: struct confirm_ctx *cctx = arg;
1.140 djm 640: const char *display;
1.123 djm 641: Channel *c;
1.126 djm 642: int i;
1.129 deraadt 643:
1.123 djm 644: if (cctx == NULL)
645: fatal("%s: cctx == NULL", __func__);
646: if ((c = channel_lookup(id)) == NULL)
647: fatal("%s: no channel for id %d", __func__, id);
648:
1.141 djm 649: display = getenv("DISPLAY");
1.140 djm 650: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
651: char *proto, *data;
652: /* Get reasonable local authentication information. */
653: client_x11_get_proto(display, options.xauth_location,
654: options.forward_x11_trusted, &proto, &data);
655: /* Request forwarding with authentication spoofing. */
656: debug("Requesting X11 forwarding with authentication spoofing.");
657: x11_request_forwarding_with_spoofing(id, display, proto, data);
658: /* XXX wait for reply */
659: }
660:
661: if (cctx->want_agent_fwd && options.forward_agent) {
662: debug("Requesting authentication agent forwarding.");
663: channel_request_start(id, "auth-agent-req@openssh.com", 0);
664: packet_send();
665: }
666:
1.129 deraadt 667: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 668: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 669: client_subsystem_reply);
1.127 djm 670:
1.123 djm 671: c->confirm_ctx = NULL;
672: buffer_free(&cctx->cmd);
1.126 djm 673: xfree(cctx->term);
674: if (cctx->env != NULL) {
675: for (i = 0; cctx->env[i] != NULL; i++)
676: xfree(cctx->env[i]);
677: xfree(cctx->env);
1.129 deraadt 678: }
1.126 djm 679: xfree(cctx);
1.123 djm 680: }
681:
682: static void
683: client_process_control(fd_set * readset)
684: {
685: Buffer m;
686: Channel *c;
1.139 djm 687: int client_fd, new_fd[3], ver, allowed;
1.123 djm 688: socklen_t addrlen;
689: struct sockaddr_storage addr;
690: struct confirm_ctx *cctx;
691: char *cmd;
1.139 djm 692: u_int i, len, env_len, command, flags;
1.123 djm 693: uid_t euid;
694: gid_t egid;
695:
696: /*
697: * Accept connection on control socket
698: */
699: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
700: return;
701:
702: memset(&addr, 0, sizeof(addr));
703: addrlen = sizeof(addr);
704: if ((client_fd = accept(control_fd,
705: (struct sockaddr*)&addr, &addrlen)) == -1) {
706: error("%s accept: %s", __func__, strerror(errno));
707: return;
708: }
709:
710: if (getpeereid(client_fd, &euid, &egid) < 0) {
711: error("%s getpeereid failed: %s", __func__, strerror(errno));
712: close(client_fd);
713: return;
714: }
715: if ((euid != 0) && (getuid() != euid)) {
716: error("control mode uid mismatch: peer euid %u != uid %u",
717: (u_int) euid, (u_int) getuid());
718: close(client_fd);
719: return;
720: }
1.127 djm 721:
1.134 djm 722: unset_nonblock(client_fd);
723:
724: /* Read command */
725: buffer_init(&m);
726: if (ssh_msg_recv(client_fd, &m) == -1) {
727: error("%s: client msg_recv failed", __func__);
728: close(client_fd);
729: buffer_free(&m);
730: return;
731: }
1.140 djm 732: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 733: error("%s: wrong client version %d", __func__, ver);
734: buffer_free(&m);
735: close(client_fd);
736: return;
737: }
738:
1.127 djm 739: allowed = 1;
1.134 djm 740: command = buffer_get_int(&m);
741: flags = buffer_get_int(&m);
1.123 djm 742:
1.134 djm 743: buffer_clear(&m);
1.123 djm 744:
1.134 djm 745: switch (command) {
746: case SSHMUX_COMMAND_OPEN:
1.137 djm 747: if (options.control_master == SSHCTL_MASTER_ASK ||
748: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 749: allowed = ask_permission("Allow shared connection "
750: "to %s? ", host);
751: /* continue below */
752: break;
753: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 754: if (options.control_master == SSHCTL_MASTER_ASK ||
755: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 756: allowed = ask_permission("Terminate shared connection "
757: "to %s? ", host);
758: if (allowed)
759: quit_pending = 1;
1.136 deraadt 760: /* FALLTHROUGH */
1.134 djm 761: case SSHMUX_COMMAND_ALIVE_CHECK:
762: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
763: buffer_clear(&m);
764: buffer_put_int(&m, allowed);
765: buffer_put_int(&m, getpid());
1.140 djm 766: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 767: error("%s: client msg_send failed", __func__);
768: close(client_fd);
769: buffer_free(&m);
770: return;
771: }
772: buffer_free(&m);
773: close(client_fd);
774: return;
775: default:
776: error("Unsupported command %d", command);
777: buffer_free(&m);
778: close(client_fd);
779: return;
780: }
1.123 djm 781:
1.134 djm 782: /* Reply for SSHMUX_COMMAND_OPEN */
783: buffer_clear(&m);
1.127 djm 784: buffer_put_int(&m, allowed);
1.123 djm 785: buffer_put_int(&m, getpid());
1.140 djm 786: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 787: error("%s: client msg_send failed", __func__);
788: close(client_fd);
1.127 djm 789: buffer_free(&m);
1.123 djm 790: return;
791: }
792:
1.127 djm 793: if (!allowed) {
794: error("Refused control connection");
795: close(client_fd);
796: buffer_free(&m);
797: return;
798: }
799:
1.134 djm 800: buffer_clear(&m);
1.123 djm 801: if (ssh_msg_recv(client_fd, &m) == -1) {
802: error("%s: client msg_recv failed", __func__);
803: close(client_fd);
1.127 djm 804: buffer_free(&m);
1.123 djm 805: return;
806: }
1.140 djm 807: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 808: error("%s: wrong client version %d", __func__, ver);
809: buffer_free(&m);
810: close(client_fd);
811: return;
812: }
813:
814: cctx = xmalloc(sizeof(*cctx));
815: memset(cctx, 0, sizeof(*cctx));
1.134 djm 816: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
817: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 818: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
819: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 820: cctx->term = buffer_get_string(&m, &len);
821:
822: cmd = buffer_get_string(&m, &len);
823: buffer_init(&cctx->cmd);
824: buffer_append(&cctx->cmd, cmd, strlen(cmd));
825:
1.126 djm 826: env_len = buffer_get_int(&m);
827: env_len = MIN(env_len, 4096);
828: debug3("%s: receiving %d env vars", __func__, env_len);
829: if (env_len != 0) {
830: cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
831: for (i = 0; i < env_len; i++)
832: cctx->env[i] = buffer_get_string(&m, &len);
833: cctx->env[i] = NULL;
834: }
835:
1.123 djm 836: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
837: cctx->want_tty, cctx->want_subsys, cmd);
838:
839: /* Gather fds from client */
840: new_fd[0] = mm_receive_fd(client_fd);
841: new_fd[1] = mm_receive_fd(client_fd);
842: new_fd[2] = mm_receive_fd(client_fd);
843:
844: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
845: new_fd[0], new_fd[1], new_fd[2]);
846:
847: /* Try to pick up ttymodes from client before it goes raw */
848: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
849: error("%s: tcgetattr: %s", __func__, strerror(errno));
850:
1.134 djm 851: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 852: buffer_clear(&m);
1.140 djm 853: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 854: error("%s: client msg_send failed", __func__);
855: close(client_fd);
856: close(new_fd[0]);
857: close(new_fd[1]);
858: close(new_fd[2]);
1.127 djm 859: buffer_free(&m);
1.134 djm 860: xfree(cctx->term);
861: if (env_len != 0) {
862: for (i = 0; i < env_len; i++)
863: xfree(cctx->env[i]);
864: xfree(cctx->env);
865: }
1.123 djm 866: return;
867: }
868: buffer_free(&m);
869:
870: /* enable nonblocking unless tty */
871: if (!isatty(new_fd[0]))
872: set_nonblock(new_fd[0]);
873: if (!isatty(new_fd[1]))
874: set_nonblock(new_fd[1]);
875: if (!isatty(new_fd[2]))
876: set_nonblock(new_fd[2]);
877:
878: set_nonblock(client_fd);
879:
1.129 deraadt 880: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 881: new_fd[0], new_fd[1], new_fd[2],
882: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
883: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
884:
885: /* XXX */
886: c->ctl_fd = client_fd;
887:
888: debug3("%s: channel_new: %d", __func__, c->self);
889:
890: channel_send_open(c->self);
891: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
892: }
893:
894: static void
1.99 markus 895: process_cmdline(void)
1.97 jakob 896: {
897: void (*handler)(int);
1.135 djm 898: char *s, *cmd, *cancel_host;
1.121 djm 899: int delete = 0;
1.97 jakob 900: int local = 0;
1.135 djm 901: u_short cancel_port;
902: Forward fwd;
1.97 jakob 903:
904: leave_raw_mode();
1.101 markus 905: handler = signal(SIGINT, SIG_IGN);
1.99 markus 906: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 907: if (s == NULL)
908: goto out;
909: while (*s && isspace(*s))
910: s++;
1.121 djm 911: if (*s == '-')
912: s++; /* Skip cmdline '-', if any */
1.120 dtucker 913: if (*s == '\0')
1.97 jakob 914: goto out;
1.121 djm 915:
1.122 djm 916: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 917: logit("Commands:");
918: logit(" -Lport:host:hostport Request local forward");
919: logit(" -Rport:host:hostport Request remote forward");
920: logit(" -KRhostport Cancel remote forward");
1.146 reyk 921: if (!options.permit_local_command)
922: goto out;
923: logit(" !args Execute local command");
924: goto out;
925: }
926:
927: if (*s == '!' && options.permit_local_command) {
928: s++;
929: ssh_local_cmd(s);
1.121 djm 930: goto out;
931: }
932:
933: if (*s == 'K') {
934: delete = 1;
935: s++;
936: }
937: if (*s != 'L' && *s != 'R') {
1.109 itojun 938: logit("Invalid command.");
1.97 jakob 939: goto out;
940: }
1.121 djm 941: if (*s == 'L')
1.97 jakob 942: local = 1;
1.121 djm 943: if (local && delete) {
944: logit("Not supported.");
945: goto out;
946: }
947: if ((!local || delete) && !compat20) {
1.109 itojun 948: logit("Not supported for SSH protocol version 1.");
1.97 jakob 949: goto out;
950: }
1.121 djm 951:
952: s++;
1.97 jakob 953: while (*s && isspace(*s))
954: s++;
955:
1.121 djm 956: if (delete) {
1.135 djm 957: cancel_port = 0;
958: cancel_host = hpdelim(&s); /* may be NULL */
959: if (s != NULL) {
960: cancel_port = a2port(s);
961: cancel_host = cleanhostname(cancel_host);
962: } else {
963: cancel_port = a2port(cancel_host);
964: cancel_host = NULL;
1.121 djm 965: }
1.135 djm 966: if (cancel_port == 0) {
967: logit("Bad forwarding close port");
1.121 djm 968: goto out;
969: }
1.135 djm 970: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 971: } else {
1.135 djm 972: if (!parse_forward(&fwd, s)) {
1.121 djm 973: logit("Bad forwarding specification.");
974: goto out;
975: }
976: if (local) {
1.135 djm 977: if (channel_setup_local_fwd_listener(fwd.listen_host,
978: fwd.listen_port, fwd.connect_host,
979: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 980: logit("Port forwarding failed.");
981: goto out;
982: }
1.135 djm 983: } else {
984: channel_request_remote_forwarding(fwd.listen_host,
985: fwd.listen_port, fwd.connect_host,
986: fwd.connect_port);
987: }
988:
1.121 djm 989: logit("Forwarding port.");
990: }
991:
1.97 jakob 992: out:
993: signal(SIGINT, handler);
994: enter_raw_mode();
995: if (cmd)
996: xfree(cmd);
997: }
998:
1.31 markus 999: /* process the characters one by one */
1.77 itojun 1000: static int
1.31 markus 1001: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1002: {
1.32 markus 1003: char string[1024];
1.31 markus 1004: pid_t pid;
1005: int bytes = 0;
1.42 markus 1006: u_int i;
1007: u_char ch;
1.31 markus 1008: char *s;
1009:
1.139 djm 1010: if (len <= 0)
1011: return (0);
1012:
1013: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1014: /* Get one character at a time. */
1015: ch = buf[i];
1016:
1017: if (escape_pending) {
1018: /* We have previously seen an escape character. */
1019: /* Clear the flag now. */
1020: escape_pending = 0;
1021:
1022: /* Process the escaped character. */
1023: switch (ch) {
1024: case '.':
1025: /* Terminate the connection. */
1.32 markus 1026: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1027: buffer_append(berr, string, strlen(string));
1.31 markus 1028:
1029: quit_pending = 1;
1030: return -1;
1031:
1032: case 'Z' - 64:
1033: /* Suspend the program. */
1034: /* Print a message to that effect to the user. */
1.32 markus 1035: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1036: buffer_append(berr, string, strlen(string));
1.31 markus 1037:
1038: /* Restore terminal modes and suspend. */
1039: client_suspend_self(bin, bout, berr);
1040:
1041: /* We have been continued. */
1042: continue;
1043:
1.111 markus 1044: case 'B':
1045: if (compat20) {
1046: snprintf(string, sizeof string,
1047: "%cB\r\n", escape_char);
1048: buffer_append(berr, string,
1049: strlen(string));
1050: channel_request_start(session_ident,
1051: "break", 0);
1052: packet_put_int(1000);
1053: packet_send();
1054: }
1055: continue;
1056:
1.54 markus 1057: case 'R':
1.59 markus 1058: if (compat20) {
1059: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1060: logit("Server does not support re-keying");
1.59 markus 1061: else
1062: need_rekeying = 1;
1063: }
1.54 markus 1064: continue;
1065:
1.31 markus 1066: case '&':
1067: /*
1068: * Detach the program (continue to serve connections,
1069: * but put in background and no more new connections).
1070: */
1071: /* Restore tty modes. */
1072: leave_raw_mode();
1073:
1074: /* Stop listening for new connections. */
1.86 markus 1075: channel_stop_listening();
1.31 markus 1076:
1.86 markus 1077: snprintf(string, sizeof string,
1078: "%c& [backgrounded]\n", escape_char);
1079: buffer_append(berr, string, strlen(string));
1.31 markus 1080:
1081: /* Fork into background. */
1082: pid = fork();
1083: if (pid < 0) {
1084: error("fork: %.100s", strerror(errno));
1085: continue;
1086: }
1087: if (pid != 0) { /* This is the parent. */
1088: /* The parent just exits. */
1089: exit(0);
1090: }
1091: /* The child continues serving connections. */
1.86 markus 1092: if (compat20) {
1093: buffer_append(bin, "\004", 1);
1094: /* fake EOF on stdin */
1095: return -1;
1096: } else if (!stdin_eof) {
1097: /*
1098: * Sending SSH_CMSG_EOF alone does not always appear
1099: * to be enough. So we try to send an EOF character
1100: * first.
1101: */
1102: packet_start(SSH_CMSG_STDIN_DATA);
1103: packet_put_string("\004", 1);
1104: packet_send();
1105: /* Close stdin. */
1106: stdin_eof = 1;
1107: if (buffer_len(bin) == 0) {
1108: packet_start(SSH_CMSG_EOF);
1109: packet_send();
1110: }
1111: }
1112: continue;
1.31 markus 1113:
1114: case '?':
1.32 markus 1115: snprintf(string, sizeof string,
1.31 markus 1116: "%c?\r\n\
1117: Supported escape sequences:\r\n\
1.104 stevesk 1118: %c. - terminate connection\r\n\
1.111 markus 1119: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1120: %cC - open a command line\r\n\
1121: %cR - Request rekey (SSH protocol 2 only)\r\n\
1122: %c^Z - suspend ssh\r\n\
1123: %c# - list forwarded connections\r\n\
1124: %c& - background ssh (when waiting for connections to terminate)\r\n\
1125: %c? - this message\r\n\
1126: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1127: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1128: escape_char, escape_char, escape_char, escape_char,
1129: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1130: escape_char, escape_char, escape_char);
1.32 markus 1131: buffer_append(berr, string, strlen(string));
1.31 markus 1132: continue;
1133:
1134: case '#':
1.32 markus 1135: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1136: buffer_append(berr, string, strlen(string));
1.31 markus 1137: s = channel_open_message();
1138: buffer_append(berr, s, strlen(s));
1139: xfree(s);
1.97 jakob 1140: continue;
1141:
1142: case 'C':
1.99 markus 1143: process_cmdline();
1.31 markus 1144: continue;
1145:
1146: default:
1147: if (ch != escape_char) {
1148: buffer_put_char(bin, escape_char);
1149: bytes++;
1150: }
1151: /* Escaped characters fall through here */
1152: break;
1153: }
1154: } else {
1155: /*
1156: * The previous character was not an escape char. Check if this
1157: * is an escape.
1158: */
1159: if (last_was_cr && ch == escape_char) {
1160: /* It is. Set the flag and continue to next character. */
1161: escape_pending = 1;
1162: continue;
1163: }
1164: }
1165:
1166: /*
1167: * Normal character. Record whether it was a newline,
1168: * and append it to the buffer.
1169: */
1170: last_was_cr = (ch == '\r' || ch == '\n');
1171: buffer_put_char(bin, ch);
1172: bytes++;
1173: }
1174: return bytes;
1175: }
1176:
1.77 itojun 1177: static void
1.17 markus 1178: client_process_input(fd_set * readset)
1179: {
1.21 deraadt 1180: int len;
1.31 markus 1181: char buf[8192];
1.16 markus 1182:
1.11 markus 1183: /* Read input from stdin. */
1184: if (FD_ISSET(fileno(stdin), readset)) {
1185: /* Read as much as possible. */
1186: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1187: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1188: return; /* we'll try again later */
1.11 markus 1189: if (len <= 0) {
1.13 markus 1190: /*
1191: * Received EOF or error. They are treated
1192: * similarly, except that an error message is printed
1193: * if it was an error condition.
1194: */
1.11 markus 1195: if (len < 0) {
1196: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1197: buffer_append(&stderr_buffer, buf, strlen(buf));
1198: }
1199: /* Mark that we have seen EOF. */
1200: stdin_eof = 1;
1.13 markus 1201: /*
1202: * Send an EOF message to the server unless there is
1203: * data in the buffer. If there is data in the
1204: * buffer, no message will be sent now. Code
1205: * elsewhere will send the EOF when the buffer
1206: * becomes empty if stdin_eof is set.
1207: */
1.11 markus 1208: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1209: packet_start(SSH_CMSG_EOF);
1210: packet_send();
1.11 markus 1211: }
1.72 stevesk 1212: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1213: /*
1214: * Normal successful read, and no escape character.
1215: * Just append the data to buffer.
1216: */
1.11 markus 1217: buffer_append(&stdin_buffer, buf, len);
1218: } else {
1.13 markus 1219: /*
1220: * Normal, successful read. But we have an escape character
1221: * and have to process the characters one by one.
1222: */
1.52 markus 1223: if (process_escapes(&stdin_buffer, &stdout_buffer,
1224: &stderr_buffer, buf, len) == -1)
1.31 markus 1225: return;
1.11 markus 1226: }
1227: }
1228: }
1229:
1.77 itojun 1230: static void
1.11 markus 1231: client_process_output(fd_set * writeset)
1232: {
1233: int len;
1234: char buf[100];
1.1 deraadt 1235:
1.11 markus 1236: /* Write buffered output to stdout. */
1237: if (FD_ISSET(fileno(stdout), writeset)) {
1238: /* Write as much data as possible. */
1239: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1240: buffer_len(&stdout_buffer));
1.11 markus 1241: if (len <= 0) {
1.64 markus 1242: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1243: len = 0;
1244: else {
1.13 markus 1245: /*
1246: * An error or EOF was encountered. Put an
1247: * error message to stderr buffer.
1248: */
1.11 markus 1249: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1250: buffer_append(&stderr_buffer, buf, strlen(buf));
1251: quit_pending = 1;
1252: return;
1253: }
1254: }
1255: /* Consume printed data from the buffer. */
1256: buffer_consume(&stdout_buffer, len);
1.57 markus 1257: stdout_bytes += len;
1.11 markus 1258: }
1259: /* Write buffered output to stderr. */
1260: if (FD_ISSET(fileno(stderr), writeset)) {
1261: /* Write as much data as possible. */
1262: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1263: buffer_len(&stderr_buffer));
1.11 markus 1264: if (len <= 0) {
1.64 markus 1265: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1266: len = 0;
1267: else {
1.13 markus 1268: /* EOF or error, but can't even print error message. */
1.11 markus 1269: quit_pending = 1;
1270: return;
1271: }
1272: }
1273: /* Consume printed characters from the buffer. */
1274: buffer_consume(&stderr_buffer, len);
1.57 markus 1275: stderr_bytes += len;
1.11 markus 1276: }
1.1 deraadt 1277: }
1278:
1.13 markus 1279: /*
1.15 markus 1280: * Get packets from the connection input buffer, and process them as long as
1281: * there are packets available.
1282: *
1283: * Any unknown packets received during the actual
1284: * session cause the session to terminate. This is
1285: * intended to make debugging easier since no
1286: * confirmations are sent. Any compatible protocol
1287: * extensions must be negotiated during the
1288: * preparatory phase.
1289: */
1290:
1.77 itojun 1291: static void
1.49 itojun 1292: client_process_buffered_input_packets(void)
1.15 markus 1293: {
1.54 markus 1294: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1295: }
1296:
1.31 markus 1297: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1298:
1.77 itojun 1299: static int
1.31 markus 1300: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1301: {
1.31 markus 1302: /* XXX we assume c->extended is writeable */
1303: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1304: }
1305:
1.77 itojun 1306: static void
1.60 markus 1307: client_channel_closed(int id, void *arg)
1308: {
1.83 markus 1309: channel_cancel_cleanup(id);
1.60 markus 1310: session_closed = 1;
1.113 markus 1311: leave_raw_mode();
1.60 markus 1312: }
1313:
1.15 markus 1314: /*
1.13 markus 1315: * Implements the interactive session with the server. This is called after
1316: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1317: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1318: * used as an escape character for terminating or suspending the session.
1.13 markus 1319: */
1.1 deraadt 1320:
1.20 markus 1321: int
1.30 markus 1322: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1323: {
1.46 markus 1324: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1325: double start_time, total_time;
1.130 avsm 1326: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1327: u_int nalloc = 0;
1.11 markus 1328: char buf[100];
1329:
1330: debug("Entering interactive session.");
1331:
1332: start_time = get_current_time();
1333:
1334: /* Initialize variables. */
1335: escape_pending = 0;
1336: last_was_cr = 1;
1337: exit_status = -1;
1338: stdin_eof = 0;
1339: buffer_high = 64 * 1024;
1340: connection_in = packet_get_connection_in();
1341: connection_out = packet_get_connection_out();
1.46 markus 1342: max_fd = MAX(connection_in, connection_out);
1.123 djm 1343: if (control_fd != -1)
1344: max_fd = MAX(max_fd, control_fd);
1.46 markus 1345:
1346: if (!compat20) {
1.63 markus 1347: /* enable nonblocking unless tty */
1348: if (!isatty(fileno(stdin)))
1349: set_nonblock(fileno(stdin));
1350: if (!isatty(fileno(stdout)))
1351: set_nonblock(fileno(stdout));
1352: if (!isatty(fileno(stderr)))
1353: set_nonblock(fileno(stderr));
1.46 markus 1354: max_fd = MAX(max_fd, fileno(stdin));
1355: max_fd = MAX(max_fd, fileno(stdout));
1356: max_fd = MAX(max_fd, fileno(stderr));
1357: }
1.11 markus 1358: stdin_bytes = 0;
1359: stdout_bytes = 0;
1360: stderr_bytes = 0;
1361: quit_pending = 0;
1362: escape_char = escape_char_arg;
1363:
1364: /* Initialize buffers. */
1365: buffer_init(&stdin_buffer);
1366: buffer_init(&stdout_buffer);
1367: buffer_init(&stderr_buffer);
1368:
1.15 markus 1369: client_init_dispatch();
1370:
1.105 markus 1371: /*
1372: * Set signal handlers, (e.g. to restore non-blocking mode)
1373: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1374: */
1.131 djm 1375: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1376: signal(SIGHUP, signal_handler);
1.105 markus 1377: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1378: signal(SIGINT, signal_handler);
1379: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1380: signal(SIGQUIT, signal_handler);
1381: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1382: signal(SIGTERM, signal_handler);
1.132 djm 1383: signal(SIGWINCH, window_change_handler);
1.11 markus 1384:
1385: if (have_pty)
1386: enter_raw_mode();
1387:
1.48 markus 1388: if (compat20) {
1389: session_ident = ssh2_chan_id;
1.72 stevesk 1390: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1391: channel_register_filter(session_ident,
1.149 reyk 1392: simple_escape_filter, NULL);
1.60 markus 1393: if (session_ident != -1)
1394: channel_register_cleanup(session_ident,
1.143 djm 1395: client_channel_closed, 0);
1.48 markus 1396: } else {
1397: /* Check if we should immediately send eof on stdin. */
1.16 markus 1398: client_check_initial_eof_on_stdin();
1.48 markus 1399: }
1.30 markus 1400:
1.11 markus 1401: /* Main loop of the client for the interactive session mode. */
1402: while (!quit_pending) {
1403:
1.13 markus 1404: /* Process buffered packets sent by the server. */
1.11 markus 1405: client_process_buffered_input_packets();
1406:
1.60 markus 1407: if (compat20 && session_closed && !channel_still_open())
1408: break;
1409:
1.56 markus 1410: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1411:
1.56 markus 1412: if (rekeying) {
1413: debug("rekeying in progress");
1414: } else {
1415: /*
1416: * Make packets of buffered stdin data, and buffer
1417: * them for sending to the server.
1418: */
1419: if (!compat20)
1420: client_make_packets_from_stdin_data();
1.11 markus 1421:
1.56 markus 1422: /*
1423: * Make packets from buffered channel data, and
1424: * enqueue them for sending to the server.
1425: */
1426: if (packet_not_very_much_data_to_write())
1427: channel_output_poll();
1.11 markus 1428:
1.56 markus 1429: /*
1430: * Check if the window size has changed, and buffer a
1431: * message about it to the server if so.
1432: */
1433: client_check_window_change();
1.11 markus 1434:
1.56 markus 1435: if (quit_pending)
1436: break;
1437: }
1.13 markus 1438: /*
1439: * Wait until we have something to do (something becomes
1440: * available on one of the descriptors).
1441: */
1.81 markus 1442: max_fd2 = max_fd;
1.56 markus 1443: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1444: &max_fd2, &nalloc, rekeying);
1.11 markus 1445:
1446: if (quit_pending)
1447: break;
1448:
1.56 markus 1449: /* Do channel operations unless rekeying in progress. */
1450: if (!rekeying) {
1451: channel_after_select(readset, writeset);
1.108 markus 1452: if (need_rekeying || packet_need_rekeying()) {
1453: debug("need rekeying");
1.56 markus 1454: xxx_kex->done = 0;
1455: kex_send_kexinit(xxx_kex);
1456: need_rekeying = 0;
1457: }
1458: }
1.11 markus 1459:
1.17 markus 1460: /* Buffer input from the connection. */
1.46 markus 1461: client_process_net_input(readset);
1.17 markus 1462:
1.123 djm 1463: /* Accept control connections. */
1464: client_process_control(readset);
1465:
1.17 markus 1466: if (quit_pending)
1467: break;
1.11 markus 1468:
1.17 markus 1469: if (!compat20) {
1470: /* Buffer data from stdin */
1.46 markus 1471: client_process_input(readset);
1.17 markus 1472: /*
1473: * Process output to stdout and stderr. Output to
1474: * the connection is processed elsewhere (above).
1475: */
1.46 markus 1476: client_process_output(writeset);
1.17 markus 1477: }
1.11 markus 1478:
1.13 markus 1479: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1480: if (FD_ISSET(connection_out, writeset))
1.11 markus 1481: packet_write_poll();
1482: }
1.46 markus 1483: if (readset)
1484: xfree(readset);
1485: if (writeset)
1486: xfree(writeset);
1.11 markus 1487:
1488: /* Terminate the session. */
1489:
1490: /* Stop watching for window change. */
1.132 djm 1491: signal(SIGWINCH, SIG_DFL);
1.11 markus 1492:
1.76 markus 1493: channel_free_all();
1.11 markus 1494:
1.75 markus 1495: if (have_pty)
1496: leave_raw_mode();
1497:
1498: /* restore blocking io */
1499: if (!isatty(fileno(stdin)))
1500: unset_nonblock(fileno(stdin));
1501: if (!isatty(fileno(stdout)))
1502: unset_nonblock(fileno(stdout));
1503: if (!isatty(fileno(stderr)))
1504: unset_nonblock(fileno(stderr));
1.116 dtucker 1505:
1506: /*
1507: * If there was no shell or command requested, there will be no remote
1508: * exit status to be returned. In that case, clear error code if the
1509: * connection was deliberately terminated at this end.
1510: */
1511: if (no_shell_flag && received_signal == SIGTERM) {
1512: received_signal = 0;
1513: exit_status = 0;
1514: }
1.75 markus 1515:
1.113 markus 1516: if (received_signal)
1.89 itojun 1517: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1518:
1.13 markus 1519: /*
1520: * In interactive mode (with pseudo tty) display a message indicating
1521: * that the connection has been closed.
1522: */
1.11 markus 1523: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1524: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1525: buffer_append(&stderr_buffer, buf, strlen(buf));
1526: }
1.70 markus 1527:
1.11 markus 1528: /* Output any buffered data for stdout. */
1.70 markus 1529: while (buffer_len(&stdout_buffer) > 0) {
1530: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1531: buffer_len(&stdout_buffer));
1.70 markus 1532: if (len <= 0) {
1.11 markus 1533: error("Write failed flushing stdout buffer.");
1.70 markus 1534: break;
1535: }
1.11 markus 1536: buffer_consume(&stdout_buffer, len);
1.57 markus 1537: stdout_bytes += len;
1.11 markus 1538: }
1539:
1540: /* Output any buffered data for stderr. */
1.70 markus 1541: while (buffer_len(&stderr_buffer) > 0) {
1542: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1543: buffer_len(&stderr_buffer));
1.70 markus 1544: if (len <= 0) {
1.11 markus 1545: error("Write failed flushing stderr buffer.");
1.70 markus 1546: break;
1547: }
1.11 markus 1548: buffer_consume(&stderr_buffer, len);
1.57 markus 1549: stderr_bytes += len;
1.11 markus 1550: }
1551:
1552: /* Clear and free any buffers. */
1553: memset(buf, 0, sizeof(buf));
1554: buffer_free(&stdin_buffer);
1555: buffer_free(&stdout_buffer);
1556: buffer_free(&stderr_buffer);
1557:
1558: /* Report bytes transferred, and transfer rates. */
1559: total_time = get_current_time() - start_time;
1560: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1561: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1562: if (total_time > 0)
1563: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1564: stdin_bytes / total_time, stdout_bytes / total_time,
1565: stderr_bytes / total_time);
1.11 markus 1566:
1567: /* Return the exit status of the program. */
1568: debug("Exit status %d", exit_status);
1569: return exit_status;
1.15 markus 1570: }
1571:
1572: /*********/
1573:
1.77 itojun 1574: static void
1.94 markus 1575: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1576: {
1.42 markus 1577: u_int data_len;
1.15 markus 1578: char *data = packet_get_string(&data_len);
1.93 markus 1579: packet_check_eom();
1.15 markus 1580: buffer_append(&stdout_buffer, data, data_len);
1581: memset(data, 0, data_len);
1582: xfree(data);
1583: }
1.77 itojun 1584: static void
1.94 markus 1585: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1586: {
1.42 markus 1587: u_int data_len;
1.15 markus 1588: char *data = packet_get_string(&data_len);
1.93 markus 1589: packet_check_eom();
1.15 markus 1590: buffer_append(&stderr_buffer, data, data_len);
1591: memset(data, 0, data_len);
1592: xfree(data);
1593: }
1.77 itojun 1594: static void
1.94 markus 1595: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1596: {
1597: exit_status = packet_get_int();
1.93 markus 1598: packet_check_eom();
1.15 markus 1599: /* Acknowledge the exit. */
1600: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1601: packet_send();
1602: /*
1603: * Must wait for packet to be sent since we are
1604: * exiting the loop.
1605: */
1606: packet_write_wait();
1607: /* Flag that we want to exit. */
1608: quit_pending = 1;
1609: }
1.115 markus 1610: static void
1611: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1612: {
1613: Channel *c = NULL;
1614: int remote_id, sock;
1615:
1616: /* Read the remote channel number from the message. */
1617: remote_id = packet_get_int();
1618: packet_check_eom();
1619:
1620: /*
1621: * Get a connection to the local authentication agent (this may again
1622: * get forwarded).
1623: */
1624: sock = ssh_get_authentication_socket();
1625:
1626: /*
1627: * If we could not connect the agent, send an error message back to
1628: * the server. This should never happen unless the agent dies,
1629: * because authentication forwarding is only enabled if we have an
1630: * agent.
1631: */
1632: if (sock >= 0) {
1633: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1634: -1, 0, 0, 0, "authentication agent connection", 1);
1635: c->remote_id = remote_id;
1636: c->force_drain = 1;
1637: }
1638: if (c == NULL) {
1639: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1640: packet_put_int(remote_id);
1641: } else {
1642: /* Send a confirmation to the remote host. */
1643: debug("Forwarding authentication connection.");
1644: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1645: packet_put_int(remote_id);
1646: packet_put_int(c->self);
1647: }
1648: packet_send();
1649: }
1.15 markus 1650:
1.77 itojun 1651: static Channel *
1.40 markus 1652: client_request_forwarded_tcpip(const char *request_type, int rchan)
1653: {
1.103 deraadt 1654: Channel *c = NULL;
1.40 markus 1655: char *listen_address, *originator_address;
1656: int listen_port, originator_port;
1.67 markus 1657: int sock;
1.40 markus 1658:
1659: /* Get rest of the packet */
1660: listen_address = packet_get_string(NULL);
1661: listen_port = packet_get_int();
1662: originator_address = packet_get_string(NULL);
1663: originator_port = packet_get_int();
1.93 markus 1664: packet_check_eom();
1.40 markus 1665:
1666: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1667: listen_address, listen_port, originator_address, originator_port);
1668:
1.80 stevesk 1669: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1670: if (sock < 0) {
1671: xfree(originator_address);
1672: xfree(listen_address);
1673: return NULL;
1674: }
1675: c = channel_new("forwarded-tcpip",
1676: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1677: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1678: originator_address, 1);
1.40 markus 1679: xfree(originator_address);
1680: xfree(listen_address);
1681: return c;
1682: }
1683:
1.103 deraadt 1684: static Channel *
1.40 markus 1685: client_request_x11(const char *request_type, int rchan)
1686: {
1687: Channel *c = NULL;
1688: char *originator;
1689: int originator_port;
1.67 markus 1690: int sock;
1.40 markus 1691:
1692: if (!options.forward_x11) {
1693: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1694: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1695: return NULL;
1696: }
1697: originator = packet_get_string(NULL);
1698: if (datafellows & SSH_BUG_X11FWD) {
1699: debug2("buggy server: x11 request w/o originator_port");
1700: originator_port = 0;
1701: } else {
1702: originator_port = packet_get_int();
1703: }
1.93 markus 1704: packet_check_eom();
1.40 markus 1705: /* XXX check permission */
1.47 markus 1706: debug("client_request_x11: request from %s %d", originator,
1707: originator_port);
1.67 markus 1708: xfree(originator);
1.40 markus 1709: sock = x11_connect_display();
1.67 markus 1710: if (sock < 0)
1711: return NULL;
1712: c = channel_new("x11",
1713: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1714: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1715: c->force_drain = 1;
1.40 markus 1716: return c;
1717: }
1718:
1.103 deraadt 1719: static Channel *
1.40 markus 1720: client_request_agent(const char *request_type, int rchan)
1721: {
1722: Channel *c = NULL;
1.67 markus 1723: int sock;
1.40 markus 1724:
1725: if (!options.forward_agent) {
1726: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1727: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1728: return NULL;
1729: }
1730: sock = ssh_get_authentication_socket();
1.67 markus 1731: if (sock < 0)
1732: return NULL;
1733: c = channel_new("authentication agent connection",
1734: SSH_CHANNEL_OPEN, sock, sock, -1,
1735: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1736: "authentication agent connection", 1);
1.82 markus 1737: c->force_drain = 1;
1.40 markus 1738: return c;
1739: }
1740:
1.22 markus 1741: /* XXXX move to generic input handler */
1.77 itojun 1742: static void
1.94 markus 1743: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1744: {
1745: Channel *c = NULL;
1746: char *ctype;
1747: int rchan;
1.102 markus 1748: u_int rmaxpack, rwindow, len;
1.22 markus 1749:
1750: ctype = packet_get_string(&len);
1751: rchan = packet_get_int();
1752: rwindow = packet_get_int();
1753: rmaxpack = packet_get_int();
1754:
1.24 markus 1755: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1756: ctype, rchan, rwindow, rmaxpack);
1757:
1.40 markus 1758: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1759: c = client_request_forwarded_tcpip(ctype, rchan);
1760: } else if (strcmp(ctype, "x11") == 0) {
1761: c = client_request_x11(ctype, rchan);
1762: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1763: c = client_request_agent(ctype, rchan);
1.22 markus 1764: }
1765: /* XXX duplicate : */
1766: if (c != NULL) {
1767: debug("confirm %s", ctype);
1768: c->remote_id = rchan;
1769: c->remote_window = rwindow;
1770: c->remote_maxpacket = rmaxpack;
1.69 markus 1771: if (c->type != SSH_CHANNEL_CONNECTING) {
1772: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1773: packet_put_int(c->remote_id);
1774: packet_put_int(c->self);
1775: packet_put_int(c->local_window);
1776: packet_put_int(c->local_maxpacket);
1777: packet_send();
1778: }
1.22 markus 1779: } else {
1780: debug("failure %s", ctype);
1781: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1782: packet_put_int(rchan);
1783: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1784: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1785: packet_put_cstring("open failed");
1.66 markus 1786: packet_put_cstring("");
1787: }
1.22 markus 1788: packet_send();
1789: }
1790: xfree(ctype);
1791: }
1.77 itojun 1792: static void
1.94 markus 1793: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1794: {
1795: Channel *c = NULL;
1.123 djm 1796: int exitval, id, reply, success = 0;
1.48 markus 1797: char *rtype;
1798:
1799: id = packet_get_int();
1800: rtype = packet_get_string(NULL);
1801: reply = packet_get_char();
1802:
1803: debug("client_input_channel_req: channel %d rtype %s reply %d",
1804: id, rtype, reply);
1805:
1.128 djm 1806: if (id == -1) {
1807: error("client_input_channel_req: request for channel -1");
1808: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1809: error("client_input_channel_req: channel %d: unknown channel", id);
1810: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1811: exitval = packet_get_int();
1812: if (id == session_ident) {
1813: success = 1;
1814: exit_status = exitval;
1815: } else if (c->ctl_fd == -1) {
1816: error("client_input_channel_req: unexpected channel %d",
1817: session_ident);
1818: } else {
1819: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1820: success = 1;
1821: }
1.93 markus 1822: packet_check_eom();
1.48 markus 1823: }
1824: if (reply) {
1825: packet_start(success ?
1826: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1827: packet_put_int(id);
1.48 markus 1828: packet_send();
1829: }
1830: xfree(rtype);
1831: }
1.95 markus 1832: static void
1833: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1834: {
1835: char *rtype;
1836: int want_reply;
1837: int success = 0;
1838:
1839: rtype = packet_get_string(NULL);
1840: want_reply = packet_get_char();
1.117 markus 1841: debug("client_input_global_request: rtype %s want_reply %d",
1842: rtype, want_reply);
1.95 markus 1843: if (want_reply) {
1844: packet_start(success ?
1845: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1846: packet_send();
1847: packet_write_wait();
1848: }
1849: xfree(rtype);
1850: }
1.22 markus 1851:
1.123 djm 1852: void
1.129 deraadt 1853: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1854: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1855: dispatch_fn *subsys_repl)
1856: {
1857: int len;
1.132 djm 1858: Channel *c = NULL;
1.123 djm 1859:
1860: debug2("%s: id %d", __func__, id);
1861:
1.132 djm 1862: if ((c = channel_lookup(id)) == NULL)
1863: fatal("client_session2_setup: channel %d: unknown channel", id);
1864:
1.123 djm 1865: if (want_tty) {
1866: struct winsize ws;
1867: struct termios tio;
1868:
1869: /* Store window size in the packet. */
1870: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1871: memset(&ws, 0, sizeof(ws));
1872:
1873: channel_request_start(id, "pty-req", 0);
1874: packet_put_cstring(term != NULL ? term : "");
1875: packet_put_int(ws.ws_col);
1876: packet_put_int(ws.ws_row);
1877: packet_put_int(ws.ws_xpixel);
1878: packet_put_int(ws.ws_ypixel);
1879: tio = get_saved_tio();
1880: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1881: packet_send();
1882: /* XXX wait for reply */
1.132 djm 1883: c->client_tty = 1;
1.123 djm 1884: }
1885:
1886: /* Transfer any environment variables from client to server */
1.126 djm 1887: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1888: int i, j, matched;
1889: char *name, *val;
1890:
1891: debug("Sending environment.");
1.126 djm 1892: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1893: /* Split */
1.126 djm 1894: name = xstrdup(env[i]);
1.123 djm 1895: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1896: xfree(name);
1.123 djm 1897: continue;
1898: }
1899: *val++ = '\0';
1900:
1901: matched = 0;
1902: for (j = 0; j < options.num_send_env; j++) {
1903: if (match_pattern(name, options.send_env[j])) {
1904: matched = 1;
1905: break;
1906: }
1907: }
1908: if (!matched) {
1909: debug3("Ignored env %s", name);
1.144 stevesk 1910: xfree(name);
1.123 djm 1911: continue;
1912: }
1913:
1914: debug("Sending env %s = %s", name, val);
1915: channel_request_start(id, "env", 0);
1916: packet_put_cstring(name);
1917: packet_put_cstring(val);
1918: packet_send();
1.144 stevesk 1919: xfree(name);
1.123 djm 1920: }
1921: }
1922:
1923: len = buffer_len(cmd);
1924: if (len > 0) {
1925: if (len > 900)
1926: len = 900;
1927: if (want_subsystem) {
1928: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1929: channel_request_start(id, "subsystem", subsys_repl != NULL);
1930: if (subsys_repl != NULL) {
1931: /* register callback for reply */
1932: /* XXX we assume that client_loop has already been called */
1933: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1934: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1935: }
1936: } else {
1937: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1938: channel_request_start(id, "exec", 0);
1939: }
1940: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1941: packet_send();
1942: } else {
1943: channel_request_start(id, "shell", 0);
1944: packet_send();
1945: }
1946: }
1947:
1.77 itojun 1948: static void
1.49 itojun 1949: client_init_dispatch_20(void)
1.16 markus 1950: {
1.55 markus 1951: dispatch_init(&dispatch_protocol_error);
1.100 markus 1952:
1.16 markus 1953: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1954: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1955: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1956: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1957: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1958: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1959: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1960: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1961: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1962: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1963:
1964: /* rekeying */
1965: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1966:
1967: /* global request reply messages */
1968: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1969: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1970: }
1.77 itojun 1971: static void
1.49 itojun 1972: client_init_dispatch_13(void)
1.15 markus 1973: {
1974: dispatch_init(NULL);
1975: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1976: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1977: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1978: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1979: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1980: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1981: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1982: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1983: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1984:
1985: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1986: &client_input_agent_open : &deny_input_open);
1.39 markus 1987: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1988: &x11_input_open : &deny_input_open);
1.15 markus 1989: }
1.77 itojun 1990: static void
1.49 itojun 1991: client_init_dispatch_15(void)
1.15 markus 1992: {
1993: client_init_dispatch_13();
1994: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1995: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1996: }
1.79 stevesk 1997: static void
1.49 itojun 1998: client_init_dispatch(void)
1.15 markus 1999: {
1.16 markus 2000: if (compat20)
2001: client_init_dispatch_20();
2002: else if (compat13)
1.15 markus 2003: client_init_dispatch_13();
2004: else
2005: client_init_dispatch_15();
1.113 markus 2006: }
2007:
2008: /* client specific fatal cleanup */
2009: void
1.114 markus 2010: cleanup_exit(int i)
1.113 markus 2011: {
2012: leave_raw_mode();
2013: leave_non_blocking();
1.123 djm 2014: if (options.control_path != NULL && control_fd != -1)
2015: unlink(options.control_path);
1.114 markus 2016: _exit(i);
1.1 deraadt 2017: }
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