Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.150
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"
1.150 ! stevesk 62: RCSID("$OpenBSD: clientloop.c,v 1.149 2005/12/30 15:56:37 reyk Exp $");
! 63:
! 64: #include <termios.h>
1.1 deraadt 65:
1.45 markus 66: #include "ssh.h"
67: #include "ssh1.h"
68: #include "ssh2.h"
1.1 deraadt 69: #include "xmalloc.h"
70: #include "packet.h"
71: #include "buffer.h"
1.15 markus 72: #include "compat.h"
1.74 markus 73: #include "channels.h"
1.15 markus 74: #include "dispatch.h"
1.30 markus 75: #include "buffer.h"
76: #include "bufaux.h"
1.40 markus 77: #include "key.h"
1.54 markus 78: #include "kex.h"
1.45 markus 79: #include "log.h"
80: #include "readconf.h"
81: #include "clientloop.h"
1.147 djm 82: #include "sshconnect.h"
1.40 markus 83: #include "authfd.h"
1.45 markus 84: #include "atomicio.h"
1.118 deraadt 85: #include "sshpty.h"
1.63 markus 86: #include "misc.h"
1.123 djm 87: #include "monitor_fdpass.h"
88: #include "match.h"
89: #include "msg.h"
1.39 markus 90:
91: /* import options */
92: extern Options options;
93:
1.1 deraadt 94: /* Flag indicating that stdin should be redirected from /dev/null. */
95: extern int stdin_null_flag;
96:
1.116 dtucker 97: /* Flag indicating that no shell has been requested */
98: extern int no_shell_flag;
99:
1.123 djm 100: /* Control socket */
101: extern int control_fd;
102:
1.13 markus 103: /*
104: * Name of the host we are connecting to. This is the name given on the
105: * command line, or the HostName specified for the user-supplied name in a
106: * configuration file.
107: */
1.1 deraadt 108: extern char *host;
109:
1.13 markus 110: /*
111: * Flag to indicate that we have received a window change signal which has
112: * not yet been processed. This will cause a message indicating the new
113: * window size to be sent to the server a little later. This is volatile
114: * because this is updated in a signal handler.
115: */
1.88 markus 116: static volatile sig_atomic_t received_window_change_signal = 0;
117: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 118:
1.145 djm 119: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 120: static int in_non_blocking_mode = 0;
121:
122: /* Common data for the client loop code. */
1.31 markus 123: static int quit_pending; /* Set to non-zero to quit the client loop. */
124: static int escape_char; /* Escape character. */
1.11 markus 125: static int escape_pending; /* Last character was the escape character */
126: static int last_was_cr; /* Last character was a newline. */
127: static int exit_status; /* Used to store the exit status of the command. */
128: static int stdin_eof; /* EOF has been encountered on standard error. */
129: static Buffer stdin_buffer; /* Buffer for stdin data. */
130: static Buffer stdout_buffer; /* Buffer for stdout data. */
131: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 132: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
133: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 134: static int connection_in; /* Connection to server (input). */
135: static int connection_out; /* Connection to server (output). */
1.56 markus 136: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 137: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 138: static int server_alive_timeouts = 0;
1.1 deraadt 139:
1.77 itojun 140: static void client_init_dispatch(void);
1.16 markus 141: int session_ident = -1;
142:
1.123 djm 143: struct confirm_ctx {
144: int want_tty;
145: int want_subsys;
1.140 djm 146: int want_x_fwd;
147: int want_agent_fwd;
1.123 djm 148: Buffer cmd;
149: char *term;
150: struct termios tio;
1.126 djm 151: char **env;
1.123 djm 152: };
153:
1.54 markus 154: /*XXX*/
155: extern Kex *xxx_kex;
156:
1.123 djm 157: void ssh_process_session2_setup(int, int, int, Buffer *);
158:
1.1 deraadt 159: /* Restores stdin to blocking mode. */
160:
1.77 itojun 161: static void
1.49 itojun 162: leave_non_blocking(void)
1.1 deraadt 163: {
1.11 markus 164: if (in_non_blocking_mode) {
1.125 djm 165: unset_nonblock(fileno(stdin));
1.11 markus 166: in_non_blocking_mode = 0;
167: }
1.1 deraadt 168: }
169:
1.11 markus 170: /* Puts stdin terminal in non-blocking mode. */
171:
1.77 itojun 172: static void
1.49 itojun 173: enter_non_blocking(void)
1.1 deraadt 174: {
1.11 markus 175: in_non_blocking_mode = 1;
1.124 djm 176: set_nonblock(fileno(stdin));
1.1 deraadt 177: }
178:
1.13 markus 179: /*
180: * Signal handler for the window change signal (SIGWINCH). This just sets a
181: * flag indicating that the window has changed.
182: */
1.1 deraadt 183:
1.77 itojun 184: static void
1.11 markus 185: window_change_handler(int sig)
1.1 deraadt 186: {
1.11 markus 187: received_window_change_signal = 1;
188: signal(SIGWINCH, window_change_handler);
1.1 deraadt 189: }
190:
1.13 markus 191: /*
192: * Signal handler for signals that cause the program to terminate. These
193: * signals must be trapped to restore terminal modes.
194: */
1.1 deraadt 195:
1.77 itojun 196: static void
1.11 markus 197: signal_handler(int sig)
1.1 deraadt 198: {
1.75 markus 199: received_signal = sig;
200: quit_pending = 1;
1.1 deraadt 201: }
202:
1.13 markus 203: /*
204: * Returns current time in seconds from Jan 1, 1970 with the maximum
205: * available resolution.
206: */
1.1 deraadt 207:
1.77 itojun 208: static double
1.49 itojun 209: get_current_time(void)
1.1 deraadt 210: {
1.11 markus 211: struct timeval tv;
212: gettimeofday(&tv, NULL);
213: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 214: }
215:
216: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
217: void
218: client_x11_get_proto(const char *display, const char *xauth_path,
219: u_int trusted, char **_proto, char **_data)
220: {
221: char cmd[1024];
222: char line[512];
223: char xdisplay[512];
224: static char proto[512], data[512];
225: FILE *f;
226: int got_data = 0, generated = 0, do_unlink = 0, i;
227: char *xauthdir, *xauthfile;
228: struct stat st;
229:
230: xauthdir = xauthfile = NULL;
231: *_proto = proto;
232: *_data = data;
233: proto[0] = data[0] = '\0';
234:
235: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
236: debug("No xauth program.");
237: } else {
238: if (display == NULL) {
239: debug("x11_get_proto: DISPLAY not set");
240: return;
241: }
242: /*
243: * Handle FamilyLocal case where $DISPLAY does
244: * not match an authorization entry. For this we
245: * just try "xauth list unix:displaynum.screennum".
246: * XXX: "localhost" match to determine FamilyLocal
247: * is not perfect.
248: */
249: if (strncmp(display, "localhost:", 10) == 0) {
250: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
251: display + 10);
252: display = xdisplay;
253: }
254: if (trusted == 0) {
255: xauthdir = xmalloc(MAXPATHLEN);
256: xauthfile = xmalloc(MAXPATHLEN);
257: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
258: if (mkdtemp(xauthdir) != NULL) {
259: do_unlink = 1;
260: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
261: xauthdir);
262: snprintf(cmd, sizeof(cmd),
263: "%s -f %s generate %s " SSH_X11_PROTO
264: " untrusted timeout 1200 2>" _PATH_DEVNULL,
265: xauth_path, xauthfile, display);
266: debug2("x11_get_proto: %s", cmd);
267: if (system(cmd) == 0)
268: generated = 1;
269: }
270: }
271: snprintf(cmd, sizeof(cmd),
1.142 markus 272: "%s %s%s list %s 2>" _PATH_DEVNULL,
1.138 djm 273: xauth_path,
274: generated ? "-f " : "" ,
275: generated ? xauthfile : "",
276: display);
277: debug2("x11_get_proto: %s", cmd);
278: f = popen(cmd, "r");
279: if (f && fgets(line, sizeof(line), f) &&
280: sscanf(line, "%*s %511s %511s", proto, data) == 2)
281: got_data = 1;
282: if (f)
283: pclose(f);
284: }
285:
286: if (do_unlink) {
287: unlink(xauthfile);
288: rmdir(xauthdir);
289: }
290: if (xauthdir)
291: xfree(xauthdir);
292: if (xauthfile)
293: xfree(xauthfile);
294:
295: /*
296: * If we didn't get authentication data, just make up some
297: * data. The forwarding code will check the validity of the
298: * response anyway, and substitute this data. The X11
299: * server, however, will ignore this fake data and use
300: * whatever authentication mechanisms it was using otherwise
301: * for the local connection.
302: */
303: if (!got_data) {
304: u_int32_t rnd = 0;
305:
306: logit("Warning: No xauth data; "
307: "using fake authentication data for X11 forwarding.");
308: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
309: for (i = 0; i < 16; i++) {
310: if (i % 4 == 0)
311: rnd = arc4random();
312: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
313: rnd & 0xff);
314: rnd >>= 8;
315: }
316: }
1.1 deraadt 317: }
318:
1.13 markus 319: /*
320: * This is called when the interactive is entered. This checks if there is
321: * an EOF coming on stdin. We must check this explicitly, as select() does
322: * not appear to wake up when redirecting from /dev/null.
323: */
1.1 deraadt 324:
1.77 itojun 325: static void
1.49 itojun 326: client_check_initial_eof_on_stdin(void)
1.1 deraadt 327: {
1.11 markus 328: int len;
329: char buf[1];
1.1 deraadt 330:
1.13 markus 331: /*
332: * If standard input is to be "redirected from /dev/null", we simply
333: * mark that we have seen an EOF and send an EOF message to the
334: * server. Otherwise, we try to read a single character; it appears
335: * that for some files, such /dev/null, select() never wakes up for
336: * read for this descriptor, which means that we never get EOF. This
337: * way we will get the EOF if stdin comes from /dev/null or similar.
338: */
1.11 markus 339: if (stdin_null_flag) {
340: /* Fake EOF on stdin. */
341: debug("Sending eof.");
342: stdin_eof = 1;
343: packet_start(SSH_CMSG_EOF);
344: packet_send();
345: } else {
346: enter_non_blocking();
347:
348: /* Check for immediate EOF on stdin. */
349: len = read(fileno(stdin), buf, 1);
350: if (len == 0) {
1.13 markus 351: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 352: debug("Sending eof.");
353: stdin_eof = 1;
354: packet_start(SSH_CMSG_EOF);
355: packet_send();
356: } else if (len > 0) {
1.13 markus 357: /*
358: * Got data. We must store the data in the buffer,
359: * and also process it as an escape character if
360: * appropriate.
361: */
1.42 markus 362: if ((u_char) buf[0] == escape_char)
1.11 markus 363: escape_pending = 1;
1.52 markus 364: else
1.11 markus 365: buffer_append(&stdin_buffer, buf, 1);
366: }
367: leave_non_blocking();
368: }
1.1 deraadt 369: }
370:
371:
1.13 markus 372: /*
373: * Make packets from buffered stdin data, and buffer them for sending to the
374: * connection.
375: */
1.1 deraadt 376:
1.77 itojun 377: static void
1.49 itojun 378: client_make_packets_from_stdin_data(void)
1.1 deraadt 379: {
1.42 markus 380: u_int len;
1.1 deraadt 381:
1.11 markus 382: /* Send buffered stdin data to the server. */
383: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 384: packet_not_very_much_data_to_write()) {
1.11 markus 385: len = buffer_len(&stdin_buffer);
386: /* Keep the packets at reasonable size. */
387: if (len > packet_get_maxsize())
388: len = packet_get_maxsize();
389: packet_start(SSH_CMSG_STDIN_DATA);
390: packet_put_string(buffer_ptr(&stdin_buffer), len);
391: packet_send();
392: buffer_consume(&stdin_buffer, len);
1.52 markus 393: stdin_bytes += len;
1.11 markus 394: /* If we have a pending EOF, send it now. */
395: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
396: packet_start(SSH_CMSG_EOF);
397: packet_send();
398: }
1.1 deraadt 399: }
400: }
401:
1.13 markus 402: /*
403: * Checks if the client window has changed, and sends a packet about it to
404: * the server if so. The actual change is detected elsewhere (by a software
405: * interrupt on Unix); this just checks the flag and sends a message if
406: * appropriate.
407: */
1.1 deraadt 408:
1.77 itojun 409: static void
1.49 itojun 410: client_check_window_change(void)
1.1 deraadt 411: {
1.16 markus 412: struct winsize ws;
413:
414: if (! received_window_change_signal)
415: return;
416: /** XXX race */
417: received_window_change_signal = 0;
418:
1.37 markus 419: debug2("client_check_window_change: changed");
1.16 markus 420:
421: if (compat20) {
1.123 djm 422: channel_send_window_changes();
1.16 markus 423: } else {
1.123 djm 424: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
425: return;
1.16 markus 426: packet_start(SSH_CMSG_WINDOW_SIZE);
427: packet_put_int(ws.ws_row);
428: packet_put_int(ws.ws_col);
429: packet_put_int(ws.ws_xpixel);
430: packet_put_int(ws.ws_ypixel);
431: packet_send();
1.1 deraadt 432: }
433: }
434:
1.117 markus 435: static void
436: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
437: {
438: server_alive_timeouts = 0;
439: client_global_request_reply_fwd(type, seq, ctxt);
440: }
441:
442: static void
443: server_alive_check(void)
444: {
445: if (++server_alive_timeouts > options.server_alive_count_max)
446: packet_disconnect("Timeout, server not responding.");
447: packet_start(SSH2_MSG_GLOBAL_REQUEST);
448: packet_put_cstring("keepalive@openssh.com");
449: packet_put_char(1); /* boolean: want reply */
450: packet_send();
451: }
452:
1.13 markus 453: /*
454: * Waits until the client can do something (some data becomes available on
455: * one of the file descriptors).
456: */
1.77 itojun 457: static void
1.46 markus 458: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 459: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 460: {
1.117 markus 461: struct timeval tv, *tvp;
462: int ret;
463:
1.46 markus 464: /* Add any selections by the channel mechanism. */
1.81 markus 465: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 466:
1.16 markus 467: if (!compat20) {
1.17 markus 468: /* Read from the connection, unless our buffers are full. */
1.16 markus 469: if (buffer_len(&stdout_buffer) < buffer_high &&
470: buffer_len(&stderr_buffer) < buffer_high &&
471: channel_not_very_much_buffered_data())
1.46 markus 472: FD_SET(connection_in, *readsetp);
1.17 markus 473: /*
474: * Read from stdin, unless we have seen EOF or have very much
475: * buffered data to send to the server.
476: */
477: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 478: FD_SET(fileno(stdin), *readsetp);
1.17 markus 479:
480: /* Select stdout/stderr if have data in buffer. */
481: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 482: FD_SET(fileno(stdout), *writesetp);
1.17 markus 483: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 484: FD_SET(fileno(stderr), *writesetp);
1.16 markus 485: } else {
1.71 markus 486: /* channel_prepare_select could have closed the last channel */
1.84 markus 487: if (session_closed && !channel_still_open() &&
488: !packet_have_data_to_write()) {
489: /* clear mask since we did not call select() */
1.87 markus 490: memset(*readsetp, 0, *nallocp);
491: memset(*writesetp, 0, *nallocp);
1.84 markus 492: return;
1.71 markus 493: } else {
494: FD_SET(connection_in, *readsetp);
495: }
1.16 markus 496: }
1.11 markus 497:
498: /* Select server connection if have data to write to the server. */
499: if (packet_have_data_to_write())
1.46 markus 500: FD_SET(connection_out, *writesetp);
1.11 markus 501:
1.123 djm 502: if (control_fd != -1)
503: FD_SET(control_fd, *readsetp);
504:
1.13 markus 505: /*
506: * Wait for something to happen. This will suspend the process until
507: * some selected descriptor can be read, written, or has some other
1.117 markus 508: * event pending.
1.13 markus 509: */
1.11 markus 510:
1.117 markus 511: if (options.server_alive_interval == 0 || !compat20)
512: tvp = NULL;
1.129 deraadt 513: else {
1.117 markus 514: tv.tv_sec = options.server_alive_interval;
515: tv.tv_usec = 0;
516: tvp = &tv;
517: }
518: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
519: if (ret < 0) {
1.11 markus 520: char buf[100];
1.51 markus 521:
522: /*
523: * We have to clear the select masks, because we return.
524: * We have to return, because the mainloop checks for the flags
525: * set by the signal handlers.
526: */
1.87 markus 527: memset(*readsetp, 0, *nallocp);
528: memset(*writesetp, 0, *nallocp);
1.50 deraadt 529:
1.11 markus 530: if (errno == EINTR)
531: return;
532: /* Note: we might still have data in the buffers. */
533: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
534: buffer_append(&stderr_buffer, buf, strlen(buf));
535: quit_pending = 1;
1.117 markus 536: } else if (ret == 0)
537: server_alive_check();
1.11 markus 538: }
539:
1.77 itojun 540: static void
1.31 markus 541: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 542: {
1.11 markus 543: /* Flush stdout and stderr buffers. */
1.31 markus 544: if (buffer_len(bout) > 0)
1.112 deraadt 545: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 546: if (buffer_len(berr) > 0)
1.112 deraadt 547: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 548:
549: leave_raw_mode();
550:
1.13 markus 551: /*
552: * Free (and clear) the buffer to reduce the amount of data that gets
553: * written to swap.
554: */
1.31 markus 555: buffer_free(bin);
556: buffer_free(bout);
557: buffer_free(berr);
1.11 markus 558:
559: /* Send the suspend signal to the program itself. */
560: kill(getpid(), SIGTSTP);
561:
1.132 djm 562: /* Reset window sizes in case they have changed */
563: received_window_change_signal = 1;
1.11 markus 564:
565: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 566: buffer_init(bin);
567: buffer_init(bout);
568: buffer_init(berr);
1.11 markus 569:
570: enter_raw_mode();
571: }
572:
1.77 itojun 573: static void
1.17 markus 574: client_process_net_input(fd_set * readset)
1.11 markus 575: {
1.17 markus 576: int len;
577: char buf[8192];
1.11 markus 578:
1.13 markus 579: /*
580: * Read input from the server, and add any such data to the buffer of
581: * the packet subsystem.
582: */
1.11 markus 583: if (FD_ISSET(connection_in, readset)) {
584: /* Read as much as possible. */
585: len = read(connection_in, buf, sizeof(buf));
586: if (len == 0) {
587: /* Received EOF. The remote host has closed the connection. */
588: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
589: host);
1.1 deraadt 590: buffer_append(&stderr_buffer, buf, strlen(buf));
591: quit_pending = 1;
592: return;
1.11 markus 593: }
1.13 markus 594: /*
595: * There is a kernel bug on Solaris that causes select to
596: * sometimes wake up even though there is no data available.
597: */
1.53 millert 598: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 599: len = 0;
600:
601: if (len < 0) {
602: /* An error has encountered. Perhaps there is a network problem. */
603: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
604: host, strerror(errno));
605: buffer_append(&stderr_buffer, buf, strlen(buf));
606: quit_pending = 1;
607: return;
608: }
609: packet_process_incoming(buf, len);
610: }
1.17 markus 611: }
1.16 markus 612:
1.97 jakob 613: static void
1.123 djm 614: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
615: {
616: int id;
617: Channel *c;
1.129 deraadt 618:
1.123 djm 619: id = packet_get_int();
620: packet_check_eom();
621:
622: if ((c = channel_lookup(id)) == NULL) {
623: error("%s: no channel for id %d", __func__, id);
624: return;
625: }
626:
627: if (type == SSH2_MSG_CHANNEL_SUCCESS)
628: debug2("Request suceeded on channel %d", id);
629: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
630: error("Request failed on channel %d", id);
631: channel_free(c);
632: }
633: }
634:
635: static void
636: client_extra_session2_setup(int id, void *arg)
637: {
638: struct confirm_ctx *cctx = arg;
1.140 djm 639: const char *display;
1.123 djm 640: Channel *c;
1.126 djm 641: int i;
1.129 deraadt 642:
1.123 djm 643: if (cctx == NULL)
644: fatal("%s: cctx == NULL", __func__);
645: if ((c = channel_lookup(id)) == NULL)
646: fatal("%s: no channel for id %d", __func__, id);
647:
1.141 djm 648: display = getenv("DISPLAY");
1.140 djm 649: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
650: char *proto, *data;
651: /* Get reasonable local authentication information. */
652: client_x11_get_proto(display, options.xauth_location,
653: options.forward_x11_trusted, &proto, &data);
654: /* Request forwarding with authentication spoofing. */
655: debug("Requesting X11 forwarding with authentication spoofing.");
656: x11_request_forwarding_with_spoofing(id, display, proto, data);
657: /* XXX wait for reply */
658: }
659:
660: if (cctx->want_agent_fwd && options.forward_agent) {
661: debug("Requesting authentication agent forwarding.");
662: channel_request_start(id, "auth-agent-req@openssh.com", 0);
663: packet_send();
664: }
665:
1.129 deraadt 666: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 667: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 668: client_subsystem_reply);
1.127 djm 669:
1.123 djm 670: c->confirm_ctx = NULL;
671: buffer_free(&cctx->cmd);
1.126 djm 672: xfree(cctx->term);
673: if (cctx->env != NULL) {
674: for (i = 0; cctx->env[i] != NULL; i++)
675: xfree(cctx->env[i]);
676: xfree(cctx->env);
1.129 deraadt 677: }
1.126 djm 678: xfree(cctx);
1.123 djm 679: }
680:
681: static void
682: client_process_control(fd_set * readset)
683: {
684: Buffer m;
685: Channel *c;
1.139 djm 686: int client_fd, new_fd[3], ver, allowed;
1.123 djm 687: socklen_t addrlen;
688: struct sockaddr_storage addr;
689: struct confirm_ctx *cctx;
690: char *cmd;
1.139 djm 691: u_int i, len, env_len, command, flags;
1.123 djm 692: uid_t euid;
693: gid_t egid;
694:
695: /*
696: * Accept connection on control socket
697: */
698: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
699: return;
700:
701: memset(&addr, 0, sizeof(addr));
702: addrlen = sizeof(addr);
703: if ((client_fd = accept(control_fd,
704: (struct sockaddr*)&addr, &addrlen)) == -1) {
705: error("%s accept: %s", __func__, strerror(errno));
706: return;
707: }
708:
709: if (getpeereid(client_fd, &euid, &egid) < 0) {
710: error("%s getpeereid failed: %s", __func__, strerror(errno));
711: close(client_fd);
712: return;
713: }
714: if ((euid != 0) && (getuid() != euid)) {
715: error("control mode uid mismatch: peer euid %u != uid %u",
716: (u_int) euid, (u_int) getuid());
717: close(client_fd);
718: return;
719: }
1.127 djm 720:
1.134 djm 721: unset_nonblock(client_fd);
722:
723: /* Read command */
724: buffer_init(&m);
725: if (ssh_msg_recv(client_fd, &m) == -1) {
726: error("%s: client msg_recv failed", __func__);
727: close(client_fd);
728: buffer_free(&m);
729: return;
730: }
1.140 djm 731: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 732: error("%s: wrong client version %d", __func__, ver);
733: buffer_free(&m);
734: close(client_fd);
735: return;
736: }
737:
1.127 djm 738: allowed = 1;
1.134 djm 739: command = buffer_get_int(&m);
740: flags = buffer_get_int(&m);
1.123 djm 741:
1.134 djm 742: buffer_clear(&m);
1.123 djm 743:
1.134 djm 744: switch (command) {
745: case SSHMUX_COMMAND_OPEN:
1.137 djm 746: if (options.control_master == SSHCTL_MASTER_ASK ||
747: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 748: allowed = ask_permission("Allow shared connection "
749: "to %s? ", host);
750: /* continue below */
751: break;
752: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 753: if (options.control_master == SSHCTL_MASTER_ASK ||
754: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 755: allowed = ask_permission("Terminate shared connection "
756: "to %s? ", host);
757: if (allowed)
758: quit_pending = 1;
1.136 deraadt 759: /* FALLTHROUGH */
1.134 djm 760: case SSHMUX_COMMAND_ALIVE_CHECK:
761: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
762: buffer_clear(&m);
763: buffer_put_int(&m, allowed);
764: buffer_put_int(&m, getpid());
1.140 djm 765: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 766: error("%s: client msg_send failed", __func__);
767: close(client_fd);
768: buffer_free(&m);
769: return;
770: }
771: buffer_free(&m);
772: close(client_fd);
773: return;
774: default:
775: error("Unsupported command %d", command);
776: buffer_free(&m);
777: close(client_fd);
778: return;
779: }
1.123 djm 780:
1.134 djm 781: /* Reply for SSHMUX_COMMAND_OPEN */
782: buffer_clear(&m);
1.127 djm 783: buffer_put_int(&m, allowed);
1.123 djm 784: buffer_put_int(&m, getpid());
1.140 djm 785: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 786: error("%s: client msg_send failed", __func__);
787: close(client_fd);
1.127 djm 788: buffer_free(&m);
1.123 djm 789: return;
790: }
791:
1.127 djm 792: if (!allowed) {
793: error("Refused control connection");
794: close(client_fd);
795: buffer_free(&m);
796: return;
797: }
798:
1.134 djm 799: buffer_clear(&m);
1.123 djm 800: if (ssh_msg_recv(client_fd, &m) == -1) {
801: error("%s: client msg_recv failed", __func__);
802: close(client_fd);
1.127 djm 803: buffer_free(&m);
1.123 djm 804: return;
805: }
1.140 djm 806: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 807: error("%s: wrong client version %d", __func__, ver);
808: buffer_free(&m);
809: close(client_fd);
810: return;
811: }
812:
813: cctx = xmalloc(sizeof(*cctx));
814: memset(cctx, 0, sizeof(*cctx));
1.134 djm 815: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
816: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 817: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
818: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 819: cctx->term = buffer_get_string(&m, &len);
820:
821: cmd = buffer_get_string(&m, &len);
822: buffer_init(&cctx->cmd);
823: buffer_append(&cctx->cmd, cmd, strlen(cmd));
824:
1.126 djm 825: env_len = buffer_get_int(&m);
826: env_len = MIN(env_len, 4096);
827: debug3("%s: receiving %d env vars", __func__, env_len);
828: if (env_len != 0) {
829: cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
830: for (i = 0; i < env_len; i++)
831: cctx->env[i] = buffer_get_string(&m, &len);
832: cctx->env[i] = NULL;
833: }
834:
1.123 djm 835: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
836: cctx->want_tty, cctx->want_subsys, cmd);
837:
838: /* Gather fds from client */
839: new_fd[0] = mm_receive_fd(client_fd);
840: new_fd[1] = mm_receive_fd(client_fd);
841: new_fd[2] = mm_receive_fd(client_fd);
842:
843: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
844: new_fd[0], new_fd[1], new_fd[2]);
845:
846: /* Try to pick up ttymodes from client before it goes raw */
847: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
848: error("%s: tcgetattr: %s", __func__, strerror(errno));
849:
1.134 djm 850: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 851: buffer_clear(&m);
1.140 djm 852: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 853: error("%s: client msg_send failed", __func__);
854: close(client_fd);
855: close(new_fd[0]);
856: close(new_fd[1]);
857: close(new_fd[2]);
1.127 djm 858: buffer_free(&m);
1.134 djm 859: xfree(cctx->term);
860: if (env_len != 0) {
861: for (i = 0; i < env_len; i++)
862: xfree(cctx->env[i]);
863: xfree(cctx->env);
864: }
1.123 djm 865: return;
866: }
867: buffer_free(&m);
868:
869: /* enable nonblocking unless tty */
870: if (!isatty(new_fd[0]))
871: set_nonblock(new_fd[0]);
872: if (!isatty(new_fd[1]))
873: set_nonblock(new_fd[1]);
874: if (!isatty(new_fd[2]))
875: set_nonblock(new_fd[2]);
876:
877: set_nonblock(client_fd);
878:
1.129 deraadt 879: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 880: new_fd[0], new_fd[1], new_fd[2],
881: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
882: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
883:
884: /* XXX */
885: c->ctl_fd = client_fd;
886:
887: debug3("%s: channel_new: %d", __func__, c->self);
888:
889: channel_send_open(c->self);
890: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
891: }
892:
893: static void
1.99 markus 894: process_cmdline(void)
1.97 jakob 895: {
896: void (*handler)(int);
1.135 djm 897: char *s, *cmd, *cancel_host;
1.121 djm 898: int delete = 0;
1.97 jakob 899: int local = 0;
1.135 djm 900: u_short cancel_port;
901: Forward fwd;
1.97 jakob 902:
903: leave_raw_mode();
1.101 markus 904: handler = signal(SIGINT, SIG_IGN);
1.99 markus 905: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 906: if (s == NULL)
907: goto out;
908: while (*s && isspace(*s))
909: s++;
1.121 djm 910: if (*s == '-')
911: s++; /* Skip cmdline '-', if any */
1.120 dtucker 912: if (*s == '\0')
1.97 jakob 913: goto out;
1.121 djm 914:
1.122 djm 915: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 916: logit("Commands:");
917: logit(" -Lport:host:hostport Request local forward");
918: logit(" -Rport:host:hostport Request remote forward");
919: logit(" -KRhostport Cancel remote forward");
1.146 reyk 920: if (!options.permit_local_command)
921: goto out;
922: logit(" !args Execute local command");
923: goto out;
924: }
925:
926: if (*s == '!' && options.permit_local_command) {
927: s++;
928: ssh_local_cmd(s);
1.121 djm 929: goto out;
930: }
931:
932: if (*s == 'K') {
933: delete = 1;
934: s++;
935: }
936: if (*s != 'L' && *s != 'R') {
1.109 itojun 937: logit("Invalid command.");
1.97 jakob 938: goto out;
939: }
1.121 djm 940: if (*s == 'L')
1.97 jakob 941: local = 1;
1.121 djm 942: if (local && delete) {
943: logit("Not supported.");
944: goto out;
945: }
946: if ((!local || delete) && !compat20) {
1.109 itojun 947: logit("Not supported for SSH protocol version 1.");
1.97 jakob 948: goto out;
949: }
1.121 djm 950:
951: s++;
1.97 jakob 952: while (*s && isspace(*s))
953: s++;
954:
1.121 djm 955: if (delete) {
1.135 djm 956: cancel_port = 0;
957: cancel_host = hpdelim(&s); /* may be NULL */
958: if (s != NULL) {
959: cancel_port = a2port(s);
960: cancel_host = cleanhostname(cancel_host);
961: } else {
962: cancel_port = a2port(cancel_host);
963: cancel_host = NULL;
1.121 djm 964: }
1.135 djm 965: if (cancel_port == 0) {
966: logit("Bad forwarding close port");
1.121 djm 967: goto out;
968: }
1.135 djm 969: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 970: } else {
1.135 djm 971: if (!parse_forward(&fwd, s)) {
1.121 djm 972: logit("Bad forwarding specification.");
973: goto out;
974: }
975: if (local) {
1.135 djm 976: if (channel_setup_local_fwd_listener(fwd.listen_host,
977: fwd.listen_port, fwd.connect_host,
978: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 979: logit("Port forwarding failed.");
980: goto out;
981: }
1.135 djm 982: } else {
983: channel_request_remote_forwarding(fwd.listen_host,
984: fwd.listen_port, fwd.connect_host,
985: fwd.connect_port);
986: }
987:
1.121 djm 988: logit("Forwarding port.");
989: }
990:
1.97 jakob 991: out:
992: signal(SIGINT, handler);
993: enter_raw_mode();
994: if (cmd)
995: xfree(cmd);
996: }
997:
1.31 markus 998: /* process the characters one by one */
1.77 itojun 999: static int
1.31 markus 1000: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1001: {
1.32 markus 1002: char string[1024];
1.31 markus 1003: pid_t pid;
1004: int bytes = 0;
1.42 markus 1005: u_int i;
1006: u_char ch;
1.31 markus 1007: char *s;
1008:
1.139 djm 1009: if (len <= 0)
1010: return (0);
1011:
1012: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1013: /* Get one character at a time. */
1014: ch = buf[i];
1015:
1016: if (escape_pending) {
1017: /* We have previously seen an escape character. */
1018: /* Clear the flag now. */
1019: escape_pending = 0;
1020:
1021: /* Process the escaped character. */
1022: switch (ch) {
1023: case '.':
1024: /* Terminate the connection. */
1.32 markus 1025: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1026: buffer_append(berr, string, strlen(string));
1.31 markus 1027:
1028: quit_pending = 1;
1029: return -1;
1030:
1031: case 'Z' - 64:
1032: /* Suspend the program. */
1033: /* Print a message to that effect to the user. */
1.32 markus 1034: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1035: buffer_append(berr, string, strlen(string));
1.31 markus 1036:
1037: /* Restore terminal modes and suspend. */
1038: client_suspend_self(bin, bout, berr);
1039:
1040: /* We have been continued. */
1041: continue;
1042:
1.111 markus 1043: case 'B':
1044: if (compat20) {
1045: snprintf(string, sizeof string,
1046: "%cB\r\n", escape_char);
1047: buffer_append(berr, string,
1048: strlen(string));
1049: channel_request_start(session_ident,
1050: "break", 0);
1051: packet_put_int(1000);
1052: packet_send();
1053: }
1054: continue;
1055:
1.54 markus 1056: case 'R':
1.59 markus 1057: if (compat20) {
1058: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1059: logit("Server does not support re-keying");
1.59 markus 1060: else
1061: need_rekeying = 1;
1062: }
1.54 markus 1063: continue;
1064:
1.31 markus 1065: case '&':
1066: /*
1067: * Detach the program (continue to serve connections,
1068: * but put in background and no more new connections).
1069: */
1070: /* Restore tty modes. */
1071: leave_raw_mode();
1072:
1073: /* Stop listening for new connections. */
1.86 markus 1074: channel_stop_listening();
1.31 markus 1075:
1.86 markus 1076: snprintf(string, sizeof string,
1077: "%c& [backgrounded]\n", escape_char);
1078: buffer_append(berr, string, strlen(string));
1.31 markus 1079:
1080: /* Fork into background. */
1081: pid = fork();
1082: if (pid < 0) {
1083: error("fork: %.100s", strerror(errno));
1084: continue;
1085: }
1086: if (pid != 0) { /* This is the parent. */
1087: /* The parent just exits. */
1088: exit(0);
1089: }
1090: /* The child continues serving connections. */
1.86 markus 1091: if (compat20) {
1092: buffer_append(bin, "\004", 1);
1093: /* fake EOF on stdin */
1094: return -1;
1095: } else if (!stdin_eof) {
1096: /*
1097: * Sending SSH_CMSG_EOF alone does not always appear
1098: * to be enough. So we try to send an EOF character
1099: * first.
1100: */
1101: packet_start(SSH_CMSG_STDIN_DATA);
1102: packet_put_string("\004", 1);
1103: packet_send();
1104: /* Close stdin. */
1105: stdin_eof = 1;
1106: if (buffer_len(bin) == 0) {
1107: packet_start(SSH_CMSG_EOF);
1108: packet_send();
1109: }
1110: }
1111: continue;
1.31 markus 1112:
1113: case '?':
1.32 markus 1114: snprintf(string, sizeof string,
1.31 markus 1115: "%c?\r\n\
1116: Supported escape sequences:\r\n\
1.104 stevesk 1117: %c. - terminate connection\r\n\
1.111 markus 1118: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1119: %cC - open a command line\r\n\
1120: %cR - Request rekey (SSH protocol 2 only)\r\n\
1121: %c^Z - suspend ssh\r\n\
1122: %c# - list forwarded connections\r\n\
1123: %c& - background ssh (when waiting for connections to terminate)\r\n\
1124: %c? - this message\r\n\
1125: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1126: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1127: escape_char, escape_char, escape_char, escape_char,
1128: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1129: escape_char, escape_char, escape_char);
1.32 markus 1130: buffer_append(berr, string, strlen(string));
1.31 markus 1131: continue;
1132:
1133: case '#':
1.32 markus 1134: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1135: buffer_append(berr, string, strlen(string));
1.31 markus 1136: s = channel_open_message();
1137: buffer_append(berr, s, strlen(s));
1138: xfree(s);
1.97 jakob 1139: continue;
1140:
1141: case 'C':
1.99 markus 1142: process_cmdline();
1.31 markus 1143: continue;
1144:
1145: default:
1146: if (ch != escape_char) {
1147: buffer_put_char(bin, escape_char);
1148: bytes++;
1149: }
1150: /* Escaped characters fall through here */
1151: break;
1152: }
1153: } else {
1154: /*
1155: * The previous character was not an escape char. Check if this
1156: * is an escape.
1157: */
1158: if (last_was_cr && ch == escape_char) {
1159: /* It is. Set the flag and continue to next character. */
1160: escape_pending = 1;
1161: continue;
1162: }
1163: }
1164:
1165: /*
1166: * Normal character. Record whether it was a newline,
1167: * and append it to the buffer.
1168: */
1169: last_was_cr = (ch == '\r' || ch == '\n');
1170: buffer_put_char(bin, ch);
1171: bytes++;
1172: }
1173: return bytes;
1174: }
1175:
1.77 itojun 1176: static void
1.17 markus 1177: client_process_input(fd_set * readset)
1178: {
1.21 deraadt 1179: int len;
1.31 markus 1180: char buf[8192];
1.16 markus 1181:
1.11 markus 1182: /* Read input from stdin. */
1183: if (FD_ISSET(fileno(stdin), readset)) {
1184: /* Read as much as possible. */
1185: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1186: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1187: return; /* we'll try again later */
1.11 markus 1188: if (len <= 0) {
1.13 markus 1189: /*
1190: * Received EOF or error. They are treated
1191: * similarly, except that an error message is printed
1192: * if it was an error condition.
1193: */
1.11 markus 1194: if (len < 0) {
1195: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1196: buffer_append(&stderr_buffer, buf, strlen(buf));
1197: }
1198: /* Mark that we have seen EOF. */
1199: stdin_eof = 1;
1.13 markus 1200: /*
1201: * Send an EOF message to the server unless there is
1202: * data in the buffer. If there is data in the
1203: * buffer, no message will be sent now. Code
1204: * elsewhere will send the EOF when the buffer
1205: * becomes empty if stdin_eof is set.
1206: */
1.11 markus 1207: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1208: packet_start(SSH_CMSG_EOF);
1209: packet_send();
1.11 markus 1210: }
1.72 stevesk 1211: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1212: /*
1213: * Normal successful read, and no escape character.
1214: * Just append the data to buffer.
1215: */
1.11 markus 1216: buffer_append(&stdin_buffer, buf, len);
1217: } else {
1.13 markus 1218: /*
1219: * Normal, successful read. But we have an escape character
1220: * and have to process the characters one by one.
1221: */
1.52 markus 1222: if (process_escapes(&stdin_buffer, &stdout_buffer,
1223: &stderr_buffer, buf, len) == -1)
1.31 markus 1224: return;
1.11 markus 1225: }
1226: }
1227: }
1228:
1.77 itojun 1229: static void
1.11 markus 1230: client_process_output(fd_set * writeset)
1231: {
1232: int len;
1233: char buf[100];
1.1 deraadt 1234:
1.11 markus 1235: /* Write buffered output to stdout. */
1236: if (FD_ISSET(fileno(stdout), writeset)) {
1237: /* Write as much data as possible. */
1238: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1239: buffer_len(&stdout_buffer));
1.11 markus 1240: if (len <= 0) {
1.64 markus 1241: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1242: len = 0;
1243: else {
1.13 markus 1244: /*
1245: * An error or EOF was encountered. Put an
1246: * error message to stderr buffer.
1247: */
1.11 markus 1248: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1249: buffer_append(&stderr_buffer, buf, strlen(buf));
1250: quit_pending = 1;
1251: return;
1252: }
1253: }
1254: /* Consume printed data from the buffer. */
1255: buffer_consume(&stdout_buffer, len);
1.57 markus 1256: stdout_bytes += len;
1.11 markus 1257: }
1258: /* Write buffered output to stderr. */
1259: if (FD_ISSET(fileno(stderr), writeset)) {
1260: /* Write as much data as possible. */
1261: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1262: buffer_len(&stderr_buffer));
1.11 markus 1263: if (len <= 0) {
1.64 markus 1264: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1265: len = 0;
1266: else {
1.13 markus 1267: /* EOF or error, but can't even print error message. */
1.11 markus 1268: quit_pending = 1;
1269: return;
1270: }
1271: }
1272: /* Consume printed characters from the buffer. */
1273: buffer_consume(&stderr_buffer, len);
1.57 markus 1274: stderr_bytes += len;
1.11 markus 1275: }
1.1 deraadt 1276: }
1277:
1.13 markus 1278: /*
1.15 markus 1279: * Get packets from the connection input buffer, and process them as long as
1280: * there are packets available.
1281: *
1282: * Any unknown packets received during the actual
1283: * session cause the session to terminate. This is
1284: * intended to make debugging easier since no
1285: * confirmations are sent. Any compatible protocol
1286: * extensions must be negotiated during the
1287: * preparatory phase.
1288: */
1289:
1.77 itojun 1290: static void
1.49 itojun 1291: client_process_buffered_input_packets(void)
1.15 markus 1292: {
1.54 markus 1293: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1294: }
1295:
1.31 markus 1296: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1297:
1.77 itojun 1298: static int
1.31 markus 1299: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1300: {
1.31 markus 1301: /* XXX we assume c->extended is writeable */
1302: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1303: }
1304:
1.77 itojun 1305: static void
1.60 markus 1306: client_channel_closed(int id, void *arg)
1307: {
1.83 markus 1308: channel_cancel_cleanup(id);
1.60 markus 1309: session_closed = 1;
1.113 markus 1310: leave_raw_mode();
1.60 markus 1311: }
1312:
1.15 markus 1313: /*
1.13 markus 1314: * Implements the interactive session with the server. This is called after
1315: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1316: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1317: * used as an escape character for terminating or suspending the session.
1.13 markus 1318: */
1.1 deraadt 1319:
1.20 markus 1320: int
1.30 markus 1321: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1322: {
1.46 markus 1323: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1324: double start_time, total_time;
1.130 avsm 1325: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1326: u_int nalloc = 0;
1.11 markus 1327: char buf[100];
1328:
1329: debug("Entering interactive session.");
1330:
1331: start_time = get_current_time();
1332:
1333: /* Initialize variables. */
1334: escape_pending = 0;
1335: last_was_cr = 1;
1336: exit_status = -1;
1337: stdin_eof = 0;
1338: buffer_high = 64 * 1024;
1339: connection_in = packet_get_connection_in();
1340: connection_out = packet_get_connection_out();
1.46 markus 1341: max_fd = MAX(connection_in, connection_out);
1.123 djm 1342: if (control_fd != -1)
1343: max_fd = MAX(max_fd, control_fd);
1.46 markus 1344:
1345: if (!compat20) {
1.63 markus 1346: /* enable nonblocking unless tty */
1347: if (!isatty(fileno(stdin)))
1348: set_nonblock(fileno(stdin));
1349: if (!isatty(fileno(stdout)))
1350: set_nonblock(fileno(stdout));
1351: if (!isatty(fileno(stderr)))
1352: set_nonblock(fileno(stderr));
1.46 markus 1353: max_fd = MAX(max_fd, fileno(stdin));
1354: max_fd = MAX(max_fd, fileno(stdout));
1355: max_fd = MAX(max_fd, fileno(stderr));
1356: }
1.11 markus 1357: stdin_bytes = 0;
1358: stdout_bytes = 0;
1359: stderr_bytes = 0;
1360: quit_pending = 0;
1361: escape_char = escape_char_arg;
1362:
1363: /* Initialize buffers. */
1364: buffer_init(&stdin_buffer);
1365: buffer_init(&stdout_buffer);
1366: buffer_init(&stderr_buffer);
1367:
1.15 markus 1368: client_init_dispatch();
1369:
1.105 markus 1370: /*
1371: * Set signal handlers, (e.g. to restore non-blocking mode)
1372: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1373: */
1.131 djm 1374: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1375: signal(SIGHUP, signal_handler);
1.105 markus 1376: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1377: signal(SIGINT, signal_handler);
1378: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1379: signal(SIGQUIT, signal_handler);
1380: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1381: signal(SIGTERM, signal_handler);
1.132 djm 1382: signal(SIGWINCH, window_change_handler);
1.11 markus 1383:
1384: if (have_pty)
1385: enter_raw_mode();
1386:
1.48 markus 1387: if (compat20) {
1388: session_ident = ssh2_chan_id;
1.72 stevesk 1389: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1390: channel_register_filter(session_ident,
1.149 reyk 1391: simple_escape_filter, NULL);
1.60 markus 1392: if (session_ident != -1)
1393: channel_register_cleanup(session_ident,
1.143 djm 1394: client_channel_closed, 0);
1.48 markus 1395: } else {
1396: /* Check if we should immediately send eof on stdin. */
1.16 markus 1397: client_check_initial_eof_on_stdin();
1.48 markus 1398: }
1.30 markus 1399:
1.11 markus 1400: /* Main loop of the client for the interactive session mode. */
1401: while (!quit_pending) {
1402:
1.13 markus 1403: /* Process buffered packets sent by the server. */
1.11 markus 1404: client_process_buffered_input_packets();
1405:
1.60 markus 1406: if (compat20 && session_closed && !channel_still_open())
1407: break;
1408:
1.56 markus 1409: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1410:
1.56 markus 1411: if (rekeying) {
1412: debug("rekeying in progress");
1413: } else {
1414: /*
1415: * Make packets of buffered stdin data, and buffer
1416: * them for sending to the server.
1417: */
1418: if (!compat20)
1419: client_make_packets_from_stdin_data();
1.11 markus 1420:
1.56 markus 1421: /*
1422: * Make packets from buffered channel data, and
1423: * enqueue them for sending to the server.
1424: */
1425: if (packet_not_very_much_data_to_write())
1426: channel_output_poll();
1.11 markus 1427:
1.56 markus 1428: /*
1429: * Check if the window size has changed, and buffer a
1430: * message about it to the server if so.
1431: */
1432: client_check_window_change();
1.11 markus 1433:
1.56 markus 1434: if (quit_pending)
1435: break;
1436: }
1.13 markus 1437: /*
1438: * Wait until we have something to do (something becomes
1439: * available on one of the descriptors).
1440: */
1.81 markus 1441: max_fd2 = max_fd;
1.56 markus 1442: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1443: &max_fd2, &nalloc, rekeying);
1.11 markus 1444:
1445: if (quit_pending)
1446: break;
1447:
1.56 markus 1448: /* Do channel operations unless rekeying in progress. */
1449: if (!rekeying) {
1450: channel_after_select(readset, writeset);
1.108 markus 1451: if (need_rekeying || packet_need_rekeying()) {
1452: debug("need rekeying");
1.56 markus 1453: xxx_kex->done = 0;
1454: kex_send_kexinit(xxx_kex);
1455: need_rekeying = 0;
1456: }
1457: }
1.11 markus 1458:
1.17 markus 1459: /* Buffer input from the connection. */
1.46 markus 1460: client_process_net_input(readset);
1.17 markus 1461:
1.123 djm 1462: /* Accept control connections. */
1463: client_process_control(readset);
1464:
1.17 markus 1465: if (quit_pending)
1466: break;
1.11 markus 1467:
1.17 markus 1468: if (!compat20) {
1469: /* Buffer data from stdin */
1.46 markus 1470: client_process_input(readset);
1.17 markus 1471: /*
1472: * Process output to stdout and stderr. Output to
1473: * the connection is processed elsewhere (above).
1474: */
1.46 markus 1475: client_process_output(writeset);
1.17 markus 1476: }
1.11 markus 1477:
1.13 markus 1478: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1479: if (FD_ISSET(connection_out, writeset))
1.11 markus 1480: packet_write_poll();
1481: }
1.46 markus 1482: if (readset)
1483: xfree(readset);
1484: if (writeset)
1485: xfree(writeset);
1.11 markus 1486:
1487: /* Terminate the session. */
1488:
1489: /* Stop watching for window change. */
1.132 djm 1490: signal(SIGWINCH, SIG_DFL);
1.11 markus 1491:
1.76 markus 1492: channel_free_all();
1.11 markus 1493:
1.75 markus 1494: if (have_pty)
1495: leave_raw_mode();
1496:
1497: /* restore blocking io */
1498: if (!isatty(fileno(stdin)))
1499: unset_nonblock(fileno(stdin));
1500: if (!isatty(fileno(stdout)))
1501: unset_nonblock(fileno(stdout));
1502: if (!isatty(fileno(stderr)))
1503: unset_nonblock(fileno(stderr));
1.116 dtucker 1504:
1505: /*
1506: * If there was no shell or command requested, there will be no remote
1507: * exit status to be returned. In that case, clear error code if the
1508: * connection was deliberately terminated at this end.
1509: */
1510: if (no_shell_flag && received_signal == SIGTERM) {
1511: received_signal = 0;
1512: exit_status = 0;
1513: }
1.75 markus 1514:
1.113 markus 1515: if (received_signal)
1.89 itojun 1516: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1517:
1.13 markus 1518: /*
1519: * In interactive mode (with pseudo tty) display a message indicating
1520: * that the connection has been closed.
1521: */
1.11 markus 1522: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1523: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1524: buffer_append(&stderr_buffer, buf, strlen(buf));
1525: }
1.70 markus 1526:
1.11 markus 1527: /* Output any buffered data for stdout. */
1.70 markus 1528: while (buffer_len(&stdout_buffer) > 0) {
1529: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1530: buffer_len(&stdout_buffer));
1.70 markus 1531: if (len <= 0) {
1.11 markus 1532: error("Write failed flushing stdout buffer.");
1.70 markus 1533: break;
1534: }
1.11 markus 1535: buffer_consume(&stdout_buffer, len);
1.57 markus 1536: stdout_bytes += len;
1.11 markus 1537: }
1538:
1539: /* Output any buffered data for stderr. */
1.70 markus 1540: while (buffer_len(&stderr_buffer) > 0) {
1541: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1542: buffer_len(&stderr_buffer));
1.70 markus 1543: if (len <= 0) {
1.11 markus 1544: error("Write failed flushing stderr buffer.");
1.70 markus 1545: break;
1546: }
1.11 markus 1547: buffer_consume(&stderr_buffer, len);
1.57 markus 1548: stderr_bytes += len;
1.11 markus 1549: }
1550:
1551: /* Clear and free any buffers. */
1552: memset(buf, 0, sizeof(buf));
1553: buffer_free(&stdin_buffer);
1554: buffer_free(&stdout_buffer);
1555: buffer_free(&stderr_buffer);
1556:
1557: /* Report bytes transferred, and transfer rates. */
1558: total_time = get_current_time() - start_time;
1559: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1560: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1561: if (total_time > 0)
1562: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1563: stdin_bytes / total_time, stdout_bytes / total_time,
1564: stderr_bytes / total_time);
1.11 markus 1565:
1566: /* Return the exit status of the program. */
1567: debug("Exit status %d", exit_status);
1568: return exit_status;
1.15 markus 1569: }
1570:
1571: /*********/
1572:
1.77 itojun 1573: static void
1.94 markus 1574: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1575: {
1.42 markus 1576: u_int data_len;
1.15 markus 1577: char *data = packet_get_string(&data_len);
1.93 markus 1578: packet_check_eom();
1.15 markus 1579: buffer_append(&stdout_buffer, data, data_len);
1580: memset(data, 0, data_len);
1581: xfree(data);
1582: }
1.77 itojun 1583: static void
1.94 markus 1584: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1585: {
1.42 markus 1586: u_int data_len;
1.15 markus 1587: char *data = packet_get_string(&data_len);
1.93 markus 1588: packet_check_eom();
1.15 markus 1589: buffer_append(&stderr_buffer, data, data_len);
1590: memset(data, 0, data_len);
1591: xfree(data);
1592: }
1.77 itojun 1593: static void
1.94 markus 1594: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1595: {
1596: exit_status = packet_get_int();
1.93 markus 1597: packet_check_eom();
1.15 markus 1598: /* Acknowledge the exit. */
1599: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1600: packet_send();
1601: /*
1602: * Must wait for packet to be sent since we are
1603: * exiting the loop.
1604: */
1605: packet_write_wait();
1606: /* Flag that we want to exit. */
1607: quit_pending = 1;
1608: }
1.115 markus 1609: static void
1610: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1611: {
1612: Channel *c = NULL;
1613: int remote_id, sock;
1614:
1615: /* Read the remote channel number from the message. */
1616: remote_id = packet_get_int();
1617: packet_check_eom();
1618:
1619: /*
1620: * Get a connection to the local authentication agent (this may again
1621: * get forwarded).
1622: */
1623: sock = ssh_get_authentication_socket();
1624:
1625: /*
1626: * If we could not connect the agent, send an error message back to
1627: * the server. This should never happen unless the agent dies,
1628: * because authentication forwarding is only enabled if we have an
1629: * agent.
1630: */
1631: if (sock >= 0) {
1632: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1633: -1, 0, 0, 0, "authentication agent connection", 1);
1634: c->remote_id = remote_id;
1635: c->force_drain = 1;
1636: }
1637: if (c == NULL) {
1638: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1639: packet_put_int(remote_id);
1640: } else {
1641: /* Send a confirmation to the remote host. */
1642: debug("Forwarding authentication connection.");
1643: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1644: packet_put_int(remote_id);
1645: packet_put_int(c->self);
1646: }
1647: packet_send();
1648: }
1.15 markus 1649:
1.77 itojun 1650: static Channel *
1.40 markus 1651: client_request_forwarded_tcpip(const char *request_type, int rchan)
1652: {
1.103 deraadt 1653: Channel *c = NULL;
1.40 markus 1654: char *listen_address, *originator_address;
1655: int listen_port, originator_port;
1.67 markus 1656: int sock;
1.40 markus 1657:
1658: /* Get rest of the packet */
1659: listen_address = packet_get_string(NULL);
1660: listen_port = packet_get_int();
1661: originator_address = packet_get_string(NULL);
1662: originator_port = packet_get_int();
1.93 markus 1663: packet_check_eom();
1.40 markus 1664:
1665: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1666: listen_address, listen_port, originator_address, originator_port);
1667:
1.80 stevesk 1668: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1669: if (sock < 0) {
1670: xfree(originator_address);
1671: xfree(listen_address);
1672: return NULL;
1673: }
1674: c = channel_new("forwarded-tcpip",
1675: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1676: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1677: originator_address, 1);
1.40 markus 1678: xfree(originator_address);
1679: xfree(listen_address);
1680: return c;
1681: }
1682:
1.103 deraadt 1683: static Channel *
1.40 markus 1684: client_request_x11(const char *request_type, int rchan)
1685: {
1686: Channel *c = NULL;
1687: char *originator;
1688: int originator_port;
1.67 markus 1689: int sock;
1.40 markus 1690:
1691: if (!options.forward_x11) {
1692: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1693: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1694: return NULL;
1695: }
1696: originator = packet_get_string(NULL);
1697: if (datafellows & SSH_BUG_X11FWD) {
1698: debug2("buggy server: x11 request w/o originator_port");
1699: originator_port = 0;
1700: } else {
1701: originator_port = packet_get_int();
1702: }
1.93 markus 1703: packet_check_eom();
1.40 markus 1704: /* XXX check permission */
1.47 markus 1705: debug("client_request_x11: request from %s %d", originator,
1706: originator_port);
1.67 markus 1707: xfree(originator);
1.40 markus 1708: sock = x11_connect_display();
1.67 markus 1709: if (sock < 0)
1710: return NULL;
1711: c = channel_new("x11",
1712: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1713: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1714: c->force_drain = 1;
1.40 markus 1715: return c;
1716: }
1717:
1.103 deraadt 1718: static Channel *
1.40 markus 1719: client_request_agent(const char *request_type, int rchan)
1720: {
1721: Channel *c = NULL;
1.67 markus 1722: int sock;
1.40 markus 1723:
1724: if (!options.forward_agent) {
1725: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1726: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1727: return NULL;
1728: }
1729: sock = ssh_get_authentication_socket();
1.67 markus 1730: if (sock < 0)
1731: return NULL;
1732: c = channel_new("authentication agent connection",
1733: SSH_CHANNEL_OPEN, sock, sock, -1,
1734: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1735: "authentication agent connection", 1);
1.82 markus 1736: c->force_drain = 1;
1.40 markus 1737: return c;
1738: }
1739:
1.22 markus 1740: /* XXXX move to generic input handler */
1.77 itojun 1741: static void
1.94 markus 1742: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1743: {
1744: Channel *c = NULL;
1745: char *ctype;
1746: int rchan;
1.102 markus 1747: u_int rmaxpack, rwindow, len;
1.22 markus 1748:
1749: ctype = packet_get_string(&len);
1750: rchan = packet_get_int();
1751: rwindow = packet_get_int();
1752: rmaxpack = packet_get_int();
1753:
1.24 markus 1754: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1755: ctype, rchan, rwindow, rmaxpack);
1756:
1.40 markus 1757: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1758: c = client_request_forwarded_tcpip(ctype, rchan);
1759: } else if (strcmp(ctype, "x11") == 0) {
1760: c = client_request_x11(ctype, rchan);
1761: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1762: c = client_request_agent(ctype, rchan);
1.22 markus 1763: }
1764: /* XXX duplicate : */
1765: if (c != NULL) {
1766: debug("confirm %s", ctype);
1767: c->remote_id = rchan;
1768: c->remote_window = rwindow;
1769: c->remote_maxpacket = rmaxpack;
1.69 markus 1770: if (c->type != SSH_CHANNEL_CONNECTING) {
1771: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1772: packet_put_int(c->remote_id);
1773: packet_put_int(c->self);
1774: packet_put_int(c->local_window);
1775: packet_put_int(c->local_maxpacket);
1776: packet_send();
1777: }
1.22 markus 1778: } else {
1779: debug("failure %s", ctype);
1780: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1781: packet_put_int(rchan);
1782: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1783: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1784: packet_put_cstring("open failed");
1.66 markus 1785: packet_put_cstring("");
1786: }
1.22 markus 1787: packet_send();
1788: }
1789: xfree(ctype);
1790: }
1.77 itojun 1791: static void
1.94 markus 1792: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1793: {
1794: Channel *c = NULL;
1.123 djm 1795: int exitval, id, reply, success = 0;
1.48 markus 1796: char *rtype;
1797:
1798: id = packet_get_int();
1799: rtype = packet_get_string(NULL);
1800: reply = packet_get_char();
1801:
1802: debug("client_input_channel_req: channel %d rtype %s reply %d",
1803: id, rtype, reply);
1804:
1.128 djm 1805: if (id == -1) {
1806: error("client_input_channel_req: request for channel -1");
1807: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1808: error("client_input_channel_req: channel %d: unknown channel", id);
1809: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1810: exitval = packet_get_int();
1811: if (id == session_ident) {
1812: success = 1;
1813: exit_status = exitval;
1814: } else if (c->ctl_fd == -1) {
1815: error("client_input_channel_req: unexpected channel %d",
1816: session_ident);
1817: } else {
1818: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1819: success = 1;
1820: }
1.93 markus 1821: packet_check_eom();
1.48 markus 1822: }
1823: if (reply) {
1824: packet_start(success ?
1825: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1826: packet_put_int(id);
1.48 markus 1827: packet_send();
1828: }
1829: xfree(rtype);
1830: }
1.95 markus 1831: static void
1832: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1833: {
1834: char *rtype;
1835: int want_reply;
1836: int success = 0;
1837:
1838: rtype = packet_get_string(NULL);
1839: want_reply = packet_get_char();
1.117 markus 1840: debug("client_input_global_request: rtype %s want_reply %d",
1841: rtype, want_reply);
1.95 markus 1842: if (want_reply) {
1843: packet_start(success ?
1844: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1845: packet_send();
1846: packet_write_wait();
1847: }
1848: xfree(rtype);
1849: }
1.22 markus 1850:
1.123 djm 1851: void
1.129 deraadt 1852: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1853: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1854: dispatch_fn *subsys_repl)
1855: {
1856: int len;
1.132 djm 1857: Channel *c = NULL;
1.123 djm 1858:
1859: debug2("%s: id %d", __func__, id);
1860:
1.132 djm 1861: if ((c = channel_lookup(id)) == NULL)
1862: fatal("client_session2_setup: channel %d: unknown channel", id);
1863:
1.123 djm 1864: if (want_tty) {
1865: struct winsize ws;
1866: struct termios tio;
1867:
1868: /* Store window size in the packet. */
1869: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1870: memset(&ws, 0, sizeof(ws));
1871:
1872: channel_request_start(id, "pty-req", 0);
1873: packet_put_cstring(term != NULL ? term : "");
1874: packet_put_int(ws.ws_col);
1875: packet_put_int(ws.ws_row);
1876: packet_put_int(ws.ws_xpixel);
1877: packet_put_int(ws.ws_ypixel);
1878: tio = get_saved_tio();
1879: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1880: packet_send();
1881: /* XXX wait for reply */
1.132 djm 1882: c->client_tty = 1;
1.123 djm 1883: }
1884:
1885: /* Transfer any environment variables from client to server */
1.126 djm 1886: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1887: int i, j, matched;
1888: char *name, *val;
1889:
1890: debug("Sending environment.");
1.126 djm 1891: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1892: /* Split */
1.126 djm 1893: name = xstrdup(env[i]);
1.123 djm 1894: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1895: xfree(name);
1.123 djm 1896: continue;
1897: }
1898: *val++ = '\0';
1899:
1900: matched = 0;
1901: for (j = 0; j < options.num_send_env; j++) {
1902: if (match_pattern(name, options.send_env[j])) {
1903: matched = 1;
1904: break;
1905: }
1906: }
1907: if (!matched) {
1908: debug3("Ignored env %s", name);
1.144 stevesk 1909: xfree(name);
1.123 djm 1910: continue;
1911: }
1912:
1913: debug("Sending env %s = %s", name, val);
1914: channel_request_start(id, "env", 0);
1915: packet_put_cstring(name);
1916: packet_put_cstring(val);
1917: packet_send();
1.144 stevesk 1918: xfree(name);
1.123 djm 1919: }
1920: }
1921:
1922: len = buffer_len(cmd);
1923: if (len > 0) {
1924: if (len > 900)
1925: len = 900;
1926: if (want_subsystem) {
1927: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1928: channel_request_start(id, "subsystem", subsys_repl != NULL);
1929: if (subsys_repl != NULL) {
1930: /* register callback for reply */
1931: /* XXX we assume that client_loop has already been called */
1932: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1933: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1934: }
1935: } else {
1936: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1937: channel_request_start(id, "exec", 0);
1938: }
1939: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1940: packet_send();
1941: } else {
1942: channel_request_start(id, "shell", 0);
1943: packet_send();
1944: }
1945: }
1946:
1.77 itojun 1947: static void
1.49 itojun 1948: client_init_dispatch_20(void)
1.16 markus 1949: {
1.55 markus 1950: dispatch_init(&dispatch_protocol_error);
1.100 markus 1951:
1.16 markus 1952: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1953: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1954: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1955: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1956: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1957: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1958: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1959: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1960: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1961: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1962:
1963: /* rekeying */
1964: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1965:
1966: /* global request reply messages */
1967: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1968: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1969: }
1.77 itojun 1970: static void
1.49 itojun 1971: client_init_dispatch_13(void)
1.15 markus 1972: {
1973: dispatch_init(NULL);
1974: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1975: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1976: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1977: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1978: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1979: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1980: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1981: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1982: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1983:
1984: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1985: &client_input_agent_open : &deny_input_open);
1.39 markus 1986: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1987: &x11_input_open : &deny_input_open);
1.15 markus 1988: }
1.77 itojun 1989: static void
1.49 itojun 1990: client_init_dispatch_15(void)
1.15 markus 1991: {
1992: client_init_dispatch_13();
1993: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1994: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1995: }
1.79 stevesk 1996: static void
1.49 itojun 1997: client_init_dispatch(void)
1.15 markus 1998: {
1.16 markus 1999: if (compat20)
2000: client_init_dispatch_20();
2001: else if (compat13)
1.15 markus 2002: client_init_dispatch_13();
2003: else
2004: client_init_dispatch_15();
1.113 markus 2005: }
2006:
2007: /* client specific fatal cleanup */
2008: void
1.114 markus 2009: cleanup_exit(int i)
1.113 markus 2010: {
2011: leave_raw_mode();
2012: leave_non_blocking();
1.123 djm 2013: if (options.control_path != NULL && control_fd != -1)
2014: unlink(options.control_path);
1.114 markus 2015: _exit(i);
1.1 deraadt 2016: }
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