Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.148
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"
1.148 ! stevesk 62: RCSID("$OpenBSD: clientloop.c,v 1.147 2005/12/07 03:52:22 djm Exp $");
1.1 deraadt 63:
1.45 markus 64: #include "ssh.h"
65: #include "ssh1.h"
66: #include "ssh2.h"
1.1 deraadt 67: #include "xmalloc.h"
68: #include "packet.h"
69: #include "buffer.h"
1.15 markus 70: #include "compat.h"
1.74 markus 71: #include "channels.h"
1.15 markus 72: #include "dispatch.h"
1.30 markus 73: #include "buffer.h"
74: #include "bufaux.h"
1.40 markus 75: #include "key.h"
1.54 markus 76: #include "kex.h"
1.45 markus 77: #include "log.h"
78: #include "readconf.h"
79: #include "clientloop.h"
1.147 djm 80: #include "sshconnect.h"
1.40 markus 81: #include "authfd.h"
1.45 markus 82: #include "atomicio.h"
1.118 deraadt 83: #include "sshpty.h"
1.63 markus 84: #include "misc.h"
1.123 djm 85: #include "monitor_fdpass.h"
86: #include "match.h"
87: #include "msg.h"
1.39 markus 88:
89: /* import options */
90: extern Options options;
91:
1.1 deraadt 92: /* Flag indicating that stdin should be redirected from /dev/null. */
93: extern int stdin_null_flag;
94:
1.116 dtucker 95: /* Flag indicating that no shell has been requested */
96: extern int no_shell_flag;
97:
1.123 djm 98: /* Control socket */
99: extern int control_fd;
100:
1.13 markus 101: /*
102: * Name of the host we are connecting to. This is the name given on the
103: * command line, or the HostName specified for the user-supplied name in a
104: * configuration file.
105: */
1.1 deraadt 106: extern char *host;
107:
1.13 markus 108: /*
109: * Flag to indicate that we have received a window change signal which has
110: * not yet been processed. This will cause a message indicating the new
111: * window size to be sent to the server a little later. This is volatile
112: * because this is updated in a signal handler.
113: */
1.88 markus 114: static volatile sig_atomic_t received_window_change_signal = 0;
115: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 116:
1.145 djm 117: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 118: static int in_non_blocking_mode = 0;
119:
120: /* Common data for the client loop code. */
1.31 markus 121: static int quit_pending; /* Set to non-zero to quit the client loop. */
122: static int escape_char; /* Escape character. */
1.11 markus 123: static int escape_pending; /* Last character was the escape character */
124: static int last_was_cr; /* Last character was a newline. */
125: static int exit_status; /* Used to store the exit status of the command. */
126: static int stdin_eof; /* EOF has been encountered on standard error. */
127: static Buffer stdin_buffer; /* Buffer for stdin data. */
128: static Buffer stdout_buffer; /* Buffer for stdout data. */
129: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 130: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
131: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 132: static int connection_in; /* Connection to server (input). */
133: static int connection_out; /* Connection to server (output). */
1.56 markus 134: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 135: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 136: static int server_alive_timeouts = 0;
1.1 deraadt 137:
1.77 itojun 138: static void client_init_dispatch(void);
1.16 markus 139: int session_ident = -1;
140:
1.123 djm 141: struct confirm_ctx {
142: int want_tty;
143: int want_subsys;
1.140 djm 144: int want_x_fwd;
145: int want_agent_fwd;
1.123 djm 146: Buffer cmd;
147: char *term;
148: struct termios tio;
1.126 djm 149: char **env;
1.123 djm 150: };
151:
1.54 markus 152: /*XXX*/
153: extern Kex *xxx_kex;
154:
1.123 djm 155: void ssh_process_session2_setup(int, int, int, Buffer *);
156:
1.1 deraadt 157: /* Restores stdin to blocking mode. */
158:
1.77 itojun 159: static void
1.49 itojun 160: leave_non_blocking(void)
1.1 deraadt 161: {
1.11 markus 162: if (in_non_blocking_mode) {
1.125 djm 163: unset_nonblock(fileno(stdin));
1.11 markus 164: in_non_blocking_mode = 0;
165: }
1.1 deraadt 166: }
167:
1.11 markus 168: /* Puts stdin terminal in non-blocking mode. */
169:
1.77 itojun 170: static void
1.49 itojun 171: enter_non_blocking(void)
1.1 deraadt 172: {
1.11 markus 173: in_non_blocking_mode = 1;
1.124 djm 174: set_nonblock(fileno(stdin));
1.1 deraadt 175: }
176:
1.13 markus 177: /*
178: * Signal handler for the window change signal (SIGWINCH). This just sets a
179: * flag indicating that the window has changed.
180: */
1.1 deraadt 181:
1.77 itojun 182: static void
1.11 markus 183: window_change_handler(int sig)
1.1 deraadt 184: {
1.11 markus 185: received_window_change_signal = 1;
186: signal(SIGWINCH, window_change_handler);
1.1 deraadt 187: }
188:
1.13 markus 189: /*
190: * Signal handler for signals that cause the program to terminate. These
191: * signals must be trapped to restore terminal modes.
192: */
1.1 deraadt 193:
1.77 itojun 194: static void
1.11 markus 195: signal_handler(int sig)
1.1 deraadt 196: {
1.75 markus 197: received_signal = sig;
198: quit_pending = 1;
1.1 deraadt 199: }
200:
1.13 markus 201: /*
202: * Returns current time in seconds from Jan 1, 1970 with the maximum
203: * available resolution.
204: */
1.1 deraadt 205:
1.77 itojun 206: static double
1.49 itojun 207: get_current_time(void)
1.1 deraadt 208: {
1.11 markus 209: struct timeval tv;
210: gettimeofday(&tv, NULL);
211: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 212: }
213:
214: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
215: void
216: client_x11_get_proto(const char *display, const char *xauth_path,
217: u_int trusted, char **_proto, char **_data)
218: {
219: char cmd[1024];
220: char line[512];
221: char xdisplay[512];
222: static char proto[512], data[512];
223: FILE *f;
224: int got_data = 0, generated = 0, do_unlink = 0, i;
225: char *xauthdir, *xauthfile;
226: struct stat st;
227:
228: xauthdir = xauthfile = NULL;
229: *_proto = proto;
230: *_data = data;
231: proto[0] = data[0] = '\0';
232:
233: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
234: debug("No xauth program.");
235: } else {
236: if (display == NULL) {
237: debug("x11_get_proto: DISPLAY not set");
238: return;
239: }
240: /*
241: * Handle FamilyLocal case where $DISPLAY does
242: * not match an authorization entry. For this we
243: * just try "xauth list unix:displaynum.screennum".
244: * XXX: "localhost" match to determine FamilyLocal
245: * is not perfect.
246: */
247: if (strncmp(display, "localhost:", 10) == 0) {
248: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
249: display + 10);
250: display = xdisplay;
251: }
252: if (trusted == 0) {
253: xauthdir = xmalloc(MAXPATHLEN);
254: xauthfile = xmalloc(MAXPATHLEN);
255: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
256: if (mkdtemp(xauthdir) != NULL) {
257: do_unlink = 1;
258: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
259: xauthdir);
260: snprintf(cmd, sizeof(cmd),
261: "%s -f %s generate %s " SSH_X11_PROTO
262: " untrusted timeout 1200 2>" _PATH_DEVNULL,
263: xauth_path, xauthfile, display);
264: debug2("x11_get_proto: %s", cmd);
265: if (system(cmd) == 0)
266: generated = 1;
267: }
268: }
269: snprintf(cmd, sizeof(cmd),
1.142 markus 270: "%s %s%s list %s 2>" _PATH_DEVNULL,
1.138 djm 271: xauth_path,
272: generated ? "-f " : "" ,
273: generated ? xauthfile : "",
274: display);
275: debug2("x11_get_proto: %s", cmd);
276: f = popen(cmd, "r");
277: if (f && fgets(line, sizeof(line), f) &&
278: sscanf(line, "%*s %511s %511s", proto, data) == 2)
279: got_data = 1;
280: if (f)
281: pclose(f);
282: }
283:
284: if (do_unlink) {
285: unlink(xauthfile);
286: rmdir(xauthdir);
287: }
288: if (xauthdir)
289: xfree(xauthdir);
290: if (xauthfile)
291: xfree(xauthfile);
292:
293: /*
294: * If we didn't get authentication data, just make up some
295: * data. The forwarding code will check the validity of the
296: * response anyway, and substitute this data. The X11
297: * server, however, will ignore this fake data and use
298: * whatever authentication mechanisms it was using otherwise
299: * for the local connection.
300: */
301: if (!got_data) {
302: u_int32_t rnd = 0;
303:
304: logit("Warning: No xauth data; "
305: "using fake authentication data for X11 forwarding.");
306: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
307: for (i = 0; i < 16; i++) {
308: if (i % 4 == 0)
309: rnd = arc4random();
310: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
311: rnd & 0xff);
312: rnd >>= 8;
313: }
314: }
1.1 deraadt 315: }
316:
1.13 markus 317: /*
318: * This is called when the interactive is entered. This checks if there is
319: * an EOF coming on stdin. We must check this explicitly, as select() does
320: * not appear to wake up when redirecting from /dev/null.
321: */
1.1 deraadt 322:
1.77 itojun 323: static void
1.49 itojun 324: client_check_initial_eof_on_stdin(void)
1.1 deraadt 325: {
1.11 markus 326: int len;
327: char buf[1];
1.1 deraadt 328:
1.13 markus 329: /*
330: * If standard input is to be "redirected from /dev/null", we simply
331: * mark that we have seen an EOF and send an EOF message to the
332: * server. Otherwise, we try to read a single character; it appears
333: * that for some files, such /dev/null, select() never wakes up for
334: * read for this descriptor, which means that we never get EOF. This
335: * way we will get the EOF if stdin comes from /dev/null or similar.
336: */
1.11 markus 337: if (stdin_null_flag) {
338: /* Fake EOF on stdin. */
339: debug("Sending eof.");
340: stdin_eof = 1;
341: packet_start(SSH_CMSG_EOF);
342: packet_send();
343: } else {
344: enter_non_blocking();
345:
346: /* Check for immediate EOF on stdin. */
347: len = read(fileno(stdin), buf, 1);
348: if (len == 0) {
1.13 markus 349: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 350: debug("Sending eof.");
351: stdin_eof = 1;
352: packet_start(SSH_CMSG_EOF);
353: packet_send();
354: } else if (len > 0) {
1.13 markus 355: /*
356: * Got data. We must store the data in the buffer,
357: * and also process it as an escape character if
358: * appropriate.
359: */
1.42 markus 360: if ((u_char) buf[0] == escape_char)
1.11 markus 361: escape_pending = 1;
1.52 markus 362: else
1.11 markus 363: buffer_append(&stdin_buffer, buf, 1);
364: }
365: leave_non_blocking();
366: }
1.1 deraadt 367: }
368:
369:
1.13 markus 370: /*
371: * Make packets from buffered stdin data, and buffer them for sending to the
372: * connection.
373: */
1.1 deraadt 374:
1.77 itojun 375: static void
1.49 itojun 376: client_make_packets_from_stdin_data(void)
1.1 deraadt 377: {
1.42 markus 378: u_int len;
1.1 deraadt 379:
1.11 markus 380: /* Send buffered stdin data to the server. */
381: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 382: packet_not_very_much_data_to_write()) {
1.11 markus 383: len = buffer_len(&stdin_buffer);
384: /* Keep the packets at reasonable size. */
385: if (len > packet_get_maxsize())
386: len = packet_get_maxsize();
387: packet_start(SSH_CMSG_STDIN_DATA);
388: packet_put_string(buffer_ptr(&stdin_buffer), len);
389: packet_send();
390: buffer_consume(&stdin_buffer, len);
1.52 markus 391: stdin_bytes += len;
1.11 markus 392: /* If we have a pending EOF, send it now. */
393: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
394: packet_start(SSH_CMSG_EOF);
395: packet_send();
396: }
1.1 deraadt 397: }
398: }
399:
1.13 markus 400: /*
401: * Checks if the client window has changed, and sends a packet about it to
402: * the server if so. The actual change is detected elsewhere (by a software
403: * interrupt on Unix); this just checks the flag and sends a message if
404: * appropriate.
405: */
1.1 deraadt 406:
1.77 itojun 407: static void
1.49 itojun 408: client_check_window_change(void)
1.1 deraadt 409: {
1.16 markus 410: struct winsize ws;
411:
412: if (! received_window_change_signal)
413: return;
414: /** XXX race */
415: received_window_change_signal = 0;
416:
1.37 markus 417: debug2("client_check_window_change: changed");
1.16 markus 418:
419: if (compat20) {
1.123 djm 420: channel_send_window_changes();
1.16 markus 421: } else {
1.123 djm 422: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
423: return;
1.16 markus 424: packet_start(SSH_CMSG_WINDOW_SIZE);
425: packet_put_int(ws.ws_row);
426: packet_put_int(ws.ws_col);
427: packet_put_int(ws.ws_xpixel);
428: packet_put_int(ws.ws_ypixel);
429: packet_send();
1.1 deraadt 430: }
431: }
432:
1.117 markus 433: static void
434: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
435: {
436: server_alive_timeouts = 0;
437: client_global_request_reply_fwd(type, seq, ctxt);
438: }
439:
440: static void
441: server_alive_check(void)
442: {
443: if (++server_alive_timeouts > options.server_alive_count_max)
444: packet_disconnect("Timeout, server not responding.");
445: packet_start(SSH2_MSG_GLOBAL_REQUEST);
446: packet_put_cstring("keepalive@openssh.com");
447: packet_put_char(1); /* boolean: want reply */
448: packet_send();
449: }
450:
1.13 markus 451: /*
452: * Waits until the client can do something (some data becomes available on
453: * one of the file descriptors).
454: */
1.77 itojun 455: static void
1.46 markus 456: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 457: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 458: {
1.117 markus 459: struct timeval tv, *tvp;
460: int ret;
461:
1.46 markus 462: /* Add any selections by the channel mechanism. */
1.81 markus 463: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 464:
1.16 markus 465: if (!compat20) {
1.17 markus 466: /* Read from the connection, unless our buffers are full. */
1.16 markus 467: if (buffer_len(&stdout_buffer) < buffer_high &&
468: buffer_len(&stderr_buffer) < buffer_high &&
469: channel_not_very_much_buffered_data())
1.46 markus 470: FD_SET(connection_in, *readsetp);
1.17 markus 471: /*
472: * Read from stdin, unless we have seen EOF or have very much
473: * buffered data to send to the server.
474: */
475: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 476: FD_SET(fileno(stdin), *readsetp);
1.17 markus 477:
478: /* Select stdout/stderr if have data in buffer. */
479: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 480: FD_SET(fileno(stdout), *writesetp);
1.17 markus 481: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 482: FD_SET(fileno(stderr), *writesetp);
1.16 markus 483: } else {
1.71 markus 484: /* channel_prepare_select could have closed the last channel */
1.84 markus 485: if (session_closed && !channel_still_open() &&
486: !packet_have_data_to_write()) {
487: /* clear mask since we did not call select() */
1.87 markus 488: memset(*readsetp, 0, *nallocp);
489: memset(*writesetp, 0, *nallocp);
1.84 markus 490: return;
1.71 markus 491: } else {
492: FD_SET(connection_in, *readsetp);
493: }
1.16 markus 494: }
1.11 markus 495:
496: /* Select server connection if have data to write to the server. */
497: if (packet_have_data_to_write())
1.46 markus 498: FD_SET(connection_out, *writesetp);
1.11 markus 499:
1.123 djm 500: if (control_fd != -1)
501: FD_SET(control_fd, *readsetp);
502:
1.13 markus 503: /*
504: * Wait for something to happen. This will suspend the process until
505: * some selected descriptor can be read, written, or has some other
1.117 markus 506: * event pending.
1.13 markus 507: */
1.11 markus 508:
1.117 markus 509: if (options.server_alive_interval == 0 || !compat20)
510: tvp = NULL;
1.129 deraadt 511: else {
1.117 markus 512: tv.tv_sec = options.server_alive_interval;
513: tv.tv_usec = 0;
514: tvp = &tv;
515: }
516: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
517: if (ret < 0) {
1.11 markus 518: char buf[100];
1.51 markus 519:
520: /*
521: * We have to clear the select masks, because we return.
522: * We have to return, because the mainloop checks for the flags
523: * set by the signal handlers.
524: */
1.87 markus 525: memset(*readsetp, 0, *nallocp);
526: memset(*writesetp, 0, *nallocp);
1.50 deraadt 527:
1.11 markus 528: if (errno == EINTR)
529: return;
530: /* Note: we might still have data in the buffers. */
531: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
532: buffer_append(&stderr_buffer, buf, strlen(buf));
533: quit_pending = 1;
1.117 markus 534: } else if (ret == 0)
535: server_alive_check();
1.11 markus 536: }
537:
1.77 itojun 538: static void
1.31 markus 539: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 540: {
1.11 markus 541: /* Flush stdout and stderr buffers. */
1.31 markus 542: if (buffer_len(bout) > 0)
1.112 deraadt 543: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 544: if (buffer_len(berr) > 0)
1.112 deraadt 545: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 546:
547: leave_raw_mode();
548:
1.13 markus 549: /*
550: * Free (and clear) the buffer to reduce the amount of data that gets
551: * written to swap.
552: */
1.31 markus 553: buffer_free(bin);
554: buffer_free(bout);
555: buffer_free(berr);
1.11 markus 556:
557: /* Send the suspend signal to the program itself. */
558: kill(getpid(), SIGTSTP);
559:
1.132 djm 560: /* Reset window sizes in case they have changed */
561: received_window_change_signal = 1;
1.11 markus 562:
563: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 564: buffer_init(bin);
565: buffer_init(bout);
566: buffer_init(berr);
1.11 markus 567:
568: enter_raw_mode();
569: }
570:
1.77 itojun 571: static void
1.17 markus 572: client_process_net_input(fd_set * readset)
1.11 markus 573: {
1.17 markus 574: int len;
575: char buf[8192];
1.11 markus 576:
1.13 markus 577: /*
578: * Read input from the server, and add any such data to the buffer of
579: * the packet subsystem.
580: */
1.11 markus 581: if (FD_ISSET(connection_in, readset)) {
582: /* Read as much as possible. */
583: len = read(connection_in, buf, sizeof(buf));
584: if (len == 0) {
585: /* Received EOF. The remote host has closed the connection. */
586: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
587: host);
1.1 deraadt 588: buffer_append(&stderr_buffer, buf, strlen(buf));
589: quit_pending = 1;
590: return;
1.11 markus 591: }
1.13 markus 592: /*
593: * There is a kernel bug on Solaris that causes select to
594: * sometimes wake up even though there is no data available.
595: */
1.53 millert 596: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 597: len = 0;
598:
599: if (len < 0) {
600: /* An error has encountered. Perhaps there is a network problem. */
601: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
602: host, strerror(errno));
603: buffer_append(&stderr_buffer, buf, strlen(buf));
604: quit_pending = 1;
605: return;
606: }
607: packet_process_incoming(buf, len);
608: }
1.17 markus 609: }
1.16 markus 610:
1.97 jakob 611: static void
1.123 djm 612: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
613: {
614: int id;
615: Channel *c;
1.129 deraadt 616:
1.123 djm 617: id = packet_get_int();
618: packet_check_eom();
619:
620: if ((c = channel_lookup(id)) == NULL) {
621: error("%s: no channel for id %d", __func__, id);
622: return;
623: }
624:
625: if (type == SSH2_MSG_CHANNEL_SUCCESS)
626: debug2("Request suceeded on channel %d", id);
627: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
628: error("Request failed on channel %d", id);
629: channel_free(c);
630: }
631: }
632:
633: static void
634: client_extra_session2_setup(int id, void *arg)
635: {
636: struct confirm_ctx *cctx = arg;
1.140 djm 637: const char *display;
1.123 djm 638: Channel *c;
1.126 djm 639: int i;
1.129 deraadt 640:
1.123 djm 641: if (cctx == NULL)
642: fatal("%s: cctx == NULL", __func__);
643: if ((c = channel_lookup(id)) == NULL)
644: fatal("%s: no channel for id %d", __func__, id);
645:
1.141 djm 646: display = getenv("DISPLAY");
1.140 djm 647: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
648: char *proto, *data;
649: /* Get reasonable local authentication information. */
650: client_x11_get_proto(display, options.xauth_location,
651: options.forward_x11_trusted, &proto, &data);
652: /* Request forwarding with authentication spoofing. */
653: debug("Requesting X11 forwarding with authentication spoofing.");
654: x11_request_forwarding_with_spoofing(id, display, proto, data);
655: /* XXX wait for reply */
656: }
657:
658: if (cctx->want_agent_fwd && options.forward_agent) {
659: debug("Requesting authentication agent forwarding.");
660: channel_request_start(id, "auth-agent-req@openssh.com", 0);
661: packet_send();
662: }
663:
1.129 deraadt 664: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 665: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 666: client_subsystem_reply);
1.127 djm 667:
1.123 djm 668: c->confirm_ctx = NULL;
669: buffer_free(&cctx->cmd);
1.126 djm 670: xfree(cctx->term);
671: if (cctx->env != NULL) {
672: for (i = 0; cctx->env[i] != NULL; i++)
673: xfree(cctx->env[i]);
674: xfree(cctx->env);
1.129 deraadt 675: }
1.126 djm 676: xfree(cctx);
1.123 djm 677: }
678:
679: static void
680: client_process_control(fd_set * readset)
681: {
682: Buffer m;
683: Channel *c;
1.139 djm 684: int client_fd, new_fd[3], ver, allowed;
1.123 djm 685: socklen_t addrlen;
686: struct sockaddr_storage addr;
687: struct confirm_ctx *cctx;
688: char *cmd;
1.139 djm 689: u_int i, len, env_len, command, flags;
1.123 djm 690: uid_t euid;
691: gid_t egid;
692:
693: /*
694: * Accept connection on control socket
695: */
696: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
697: return;
698:
699: memset(&addr, 0, sizeof(addr));
700: addrlen = sizeof(addr);
701: if ((client_fd = accept(control_fd,
702: (struct sockaddr*)&addr, &addrlen)) == -1) {
703: error("%s accept: %s", __func__, strerror(errno));
704: return;
705: }
706:
707: if (getpeereid(client_fd, &euid, &egid) < 0) {
708: error("%s getpeereid failed: %s", __func__, strerror(errno));
709: close(client_fd);
710: return;
711: }
712: if ((euid != 0) && (getuid() != euid)) {
713: error("control mode uid mismatch: peer euid %u != uid %u",
714: (u_int) euid, (u_int) getuid());
715: close(client_fd);
716: return;
717: }
1.127 djm 718:
1.134 djm 719: unset_nonblock(client_fd);
720:
721: /* Read command */
722: buffer_init(&m);
723: if (ssh_msg_recv(client_fd, &m) == -1) {
724: error("%s: client msg_recv failed", __func__);
725: close(client_fd);
726: buffer_free(&m);
727: return;
728: }
1.140 djm 729: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 730: error("%s: wrong client version %d", __func__, ver);
731: buffer_free(&m);
732: close(client_fd);
733: return;
734: }
735:
1.127 djm 736: allowed = 1;
1.134 djm 737: command = buffer_get_int(&m);
738: flags = buffer_get_int(&m);
1.123 djm 739:
1.134 djm 740: buffer_clear(&m);
1.123 djm 741:
1.134 djm 742: switch (command) {
743: case SSHMUX_COMMAND_OPEN:
1.137 djm 744: if (options.control_master == SSHCTL_MASTER_ASK ||
745: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 746: allowed = ask_permission("Allow shared connection "
747: "to %s? ", host);
748: /* continue below */
749: break;
750: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 751: if (options.control_master == SSHCTL_MASTER_ASK ||
752: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 753: allowed = ask_permission("Terminate shared connection "
754: "to %s? ", host);
755: if (allowed)
756: quit_pending = 1;
1.136 deraadt 757: /* FALLTHROUGH */
1.134 djm 758: case SSHMUX_COMMAND_ALIVE_CHECK:
759: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
760: buffer_clear(&m);
761: buffer_put_int(&m, allowed);
762: buffer_put_int(&m, getpid());
1.140 djm 763: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 764: error("%s: client msg_send failed", __func__);
765: close(client_fd);
766: buffer_free(&m);
767: return;
768: }
769: buffer_free(&m);
770: close(client_fd);
771: return;
772: default:
773: error("Unsupported command %d", command);
774: buffer_free(&m);
775: close(client_fd);
776: return;
777: }
1.123 djm 778:
1.134 djm 779: /* Reply for SSHMUX_COMMAND_OPEN */
780: buffer_clear(&m);
1.127 djm 781: buffer_put_int(&m, allowed);
1.123 djm 782: buffer_put_int(&m, getpid());
1.140 djm 783: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 784: error("%s: client msg_send failed", __func__);
785: close(client_fd);
1.127 djm 786: buffer_free(&m);
1.123 djm 787: return;
788: }
789:
1.127 djm 790: if (!allowed) {
791: error("Refused control connection");
792: close(client_fd);
793: buffer_free(&m);
794: return;
795: }
796:
1.134 djm 797: buffer_clear(&m);
1.123 djm 798: if (ssh_msg_recv(client_fd, &m) == -1) {
799: error("%s: client msg_recv failed", __func__);
800: close(client_fd);
1.127 djm 801: buffer_free(&m);
1.123 djm 802: return;
803: }
1.140 djm 804: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 805: error("%s: wrong client version %d", __func__, ver);
806: buffer_free(&m);
807: close(client_fd);
808: return;
809: }
810:
811: cctx = xmalloc(sizeof(*cctx));
812: memset(cctx, 0, sizeof(*cctx));
1.134 djm 813: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
814: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 815: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
816: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 817: cctx->term = buffer_get_string(&m, &len);
818:
819: cmd = buffer_get_string(&m, &len);
820: buffer_init(&cctx->cmd);
821: buffer_append(&cctx->cmd, cmd, strlen(cmd));
822:
1.126 djm 823: env_len = buffer_get_int(&m);
824: env_len = MIN(env_len, 4096);
825: debug3("%s: receiving %d env vars", __func__, env_len);
826: if (env_len != 0) {
827: cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
828: for (i = 0; i < env_len; i++)
829: cctx->env[i] = buffer_get_string(&m, &len);
830: cctx->env[i] = NULL;
831: }
832:
1.123 djm 833: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
834: cctx->want_tty, cctx->want_subsys, cmd);
835:
836: /* Gather fds from client */
837: new_fd[0] = mm_receive_fd(client_fd);
838: new_fd[1] = mm_receive_fd(client_fd);
839: new_fd[2] = mm_receive_fd(client_fd);
840:
841: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
842: new_fd[0], new_fd[1], new_fd[2]);
843:
844: /* Try to pick up ttymodes from client before it goes raw */
845: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
846: error("%s: tcgetattr: %s", __func__, strerror(errno));
847:
1.134 djm 848: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 849: buffer_clear(&m);
1.140 djm 850: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 851: error("%s: client msg_send failed", __func__);
852: close(client_fd);
853: close(new_fd[0]);
854: close(new_fd[1]);
855: close(new_fd[2]);
1.127 djm 856: buffer_free(&m);
1.134 djm 857: xfree(cctx->term);
858: if (env_len != 0) {
859: for (i = 0; i < env_len; i++)
860: xfree(cctx->env[i]);
861: xfree(cctx->env);
862: }
1.123 djm 863: return;
864: }
865: buffer_free(&m);
866:
867: /* enable nonblocking unless tty */
868: if (!isatty(new_fd[0]))
869: set_nonblock(new_fd[0]);
870: if (!isatty(new_fd[1]))
871: set_nonblock(new_fd[1]);
872: if (!isatty(new_fd[2]))
873: set_nonblock(new_fd[2]);
874:
875: set_nonblock(client_fd);
876:
1.129 deraadt 877: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 878: new_fd[0], new_fd[1], new_fd[2],
879: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
880: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
881:
882: /* XXX */
883: c->ctl_fd = client_fd;
884:
885: debug3("%s: channel_new: %d", __func__, c->self);
886:
887: channel_send_open(c->self);
888: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
889: }
890:
891: static void
1.99 markus 892: process_cmdline(void)
1.97 jakob 893: {
894: void (*handler)(int);
1.135 djm 895: char *s, *cmd, *cancel_host;
1.121 djm 896: int delete = 0;
1.97 jakob 897: int local = 0;
1.135 djm 898: u_short cancel_port;
899: Forward fwd;
1.97 jakob 900:
901: leave_raw_mode();
1.101 markus 902: handler = signal(SIGINT, SIG_IGN);
1.99 markus 903: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 904: if (s == NULL)
905: goto out;
906: while (*s && isspace(*s))
907: s++;
1.121 djm 908: if (*s == '-')
909: s++; /* Skip cmdline '-', if any */
1.120 dtucker 910: if (*s == '\0')
1.97 jakob 911: goto out;
1.121 djm 912:
1.122 djm 913: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 914: logit("Commands:");
915: logit(" -Lport:host:hostport Request local forward");
916: logit(" -Rport:host:hostport Request remote forward");
917: logit(" -KRhostport Cancel remote forward");
1.146 reyk 918: if (!options.permit_local_command)
919: goto out;
920: logit(" !args Execute local command");
921: goto out;
922: }
923:
924: if (*s == '!' && options.permit_local_command) {
925: s++;
926: ssh_local_cmd(s);
1.121 djm 927: goto out;
928: }
929:
930: if (*s == 'K') {
931: delete = 1;
932: s++;
933: }
934: if (*s != 'L' && *s != 'R') {
1.109 itojun 935: logit("Invalid command.");
1.97 jakob 936: goto out;
937: }
1.121 djm 938: if (*s == 'L')
1.97 jakob 939: local = 1;
1.121 djm 940: if (local && delete) {
941: logit("Not supported.");
942: goto out;
943: }
944: if ((!local || delete) && !compat20) {
1.109 itojun 945: logit("Not supported for SSH protocol version 1.");
1.97 jakob 946: goto out;
947: }
1.121 djm 948:
949: s++;
1.97 jakob 950: while (*s && isspace(*s))
951: s++;
952:
1.121 djm 953: if (delete) {
1.135 djm 954: cancel_port = 0;
955: cancel_host = hpdelim(&s); /* may be NULL */
956: if (s != NULL) {
957: cancel_port = a2port(s);
958: cancel_host = cleanhostname(cancel_host);
959: } else {
960: cancel_port = a2port(cancel_host);
961: cancel_host = NULL;
1.121 djm 962: }
1.135 djm 963: if (cancel_port == 0) {
964: logit("Bad forwarding close port");
1.121 djm 965: goto out;
966: }
1.135 djm 967: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 968: } else {
1.135 djm 969: if (!parse_forward(&fwd, s)) {
1.121 djm 970: logit("Bad forwarding specification.");
971: goto out;
972: }
973: if (local) {
1.135 djm 974: if (channel_setup_local_fwd_listener(fwd.listen_host,
975: fwd.listen_port, fwd.connect_host,
976: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 977: logit("Port forwarding failed.");
978: goto out;
979: }
1.135 djm 980: } else {
981: channel_request_remote_forwarding(fwd.listen_host,
982: fwd.listen_port, fwd.connect_host,
983: fwd.connect_port);
984: }
985:
1.121 djm 986: logit("Forwarding port.");
987: }
988:
1.97 jakob 989: out:
990: signal(SIGINT, handler);
991: enter_raw_mode();
992: if (cmd)
993: xfree(cmd);
994: }
995:
1.31 markus 996: /* process the characters one by one */
1.77 itojun 997: static int
1.31 markus 998: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
999: {
1.32 markus 1000: char string[1024];
1.31 markus 1001: pid_t pid;
1002: int bytes = 0;
1.42 markus 1003: u_int i;
1004: u_char ch;
1.31 markus 1005: char *s;
1006:
1.139 djm 1007: if (len <= 0)
1008: return (0);
1009:
1010: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1011: /* Get one character at a time. */
1012: ch = buf[i];
1013:
1014: if (escape_pending) {
1015: /* We have previously seen an escape character. */
1016: /* Clear the flag now. */
1017: escape_pending = 0;
1018:
1019: /* Process the escaped character. */
1020: switch (ch) {
1021: case '.':
1022: /* Terminate the connection. */
1.32 markus 1023: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1024: buffer_append(berr, string, strlen(string));
1.31 markus 1025:
1026: quit_pending = 1;
1027: return -1;
1028:
1029: case 'Z' - 64:
1030: /* Suspend the program. */
1031: /* Print a message to that effect to the user. */
1.32 markus 1032: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1033: buffer_append(berr, string, strlen(string));
1.31 markus 1034:
1035: /* Restore terminal modes and suspend. */
1036: client_suspend_self(bin, bout, berr);
1037:
1038: /* We have been continued. */
1039: continue;
1040:
1.111 markus 1041: case 'B':
1042: if (compat20) {
1043: snprintf(string, sizeof string,
1044: "%cB\r\n", escape_char);
1045: buffer_append(berr, string,
1046: strlen(string));
1047: channel_request_start(session_ident,
1048: "break", 0);
1049: packet_put_int(1000);
1050: packet_send();
1051: }
1052: continue;
1053:
1.54 markus 1054: case 'R':
1.59 markus 1055: if (compat20) {
1056: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1057: logit("Server does not support re-keying");
1.59 markus 1058: else
1059: need_rekeying = 1;
1060: }
1.54 markus 1061: continue;
1062:
1.31 markus 1063: case '&':
1064: /*
1065: * Detach the program (continue to serve connections,
1066: * but put in background and no more new connections).
1067: */
1068: /* Restore tty modes. */
1069: leave_raw_mode();
1070:
1071: /* Stop listening for new connections. */
1.86 markus 1072: channel_stop_listening();
1.31 markus 1073:
1.86 markus 1074: snprintf(string, sizeof string,
1075: "%c& [backgrounded]\n", escape_char);
1076: buffer_append(berr, string, strlen(string));
1.31 markus 1077:
1078: /* Fork into background. */
1079: pid = fork();
1080: if (pid < 0) {
1081: error("fork: %.100s", strerror(errno));
1082: continue;
1083: }
1084: if (pid != 0) { /* This is the parent. */
1085: /* The parent just exits. */
1086: exit(0);
1087: }
1088: /* The child continues serving connections. */
1.86 markus 1089: if (compat20) {
1090: buffer_append(bin, "\004", 1);
1091: /* fake EOF on stdin */
1092: return -1;
1093: } else if (!stdin_eof) {
1094: /*
1095: * Sending SSH_CMSG_EOF alone does not always appear
1096: * to be enough. So we try to send an EOF character
1097: * first.
1098: */
1099: packet_start(SSH_CMSG_STDIN_DATA);
1100: packet_put_string("\004", 1);
1101: packet_send();
1102: /* Close stdin. */
1103: stdin_eof = 1;
1104: if (buffer_len(bin) == 0) {
1105: packet_start(SSH_CMSG_EOF);
1106: packet_send();
1107: }
1108: }
1109: continue;
1.31 markus 1110:
1111: case '?':
1.32 markus 1112: snprintf(string, sizeof string,
1.31 markus 1113: "%c?\r\n\
1114: Supported escape sequences:\r\n\
1.104 stevesk 1115: %c. - terminate connection\r\n\
1.111 markus 1116: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1117: %cC - open a command line\r\n\
1118: %cR - Request rekey (SSH protocol 2 only)\r\n\
1119: %c^Z - suspend ssh\r\n\
1120: %c# - list forwarded connections\r\n\
1121: %c& - background ssh (when waiting for connections to terminate)\r\n\
1122: %c? - this message\r\n\
1123: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1124: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1125: escape_char, escape_char, escape_char, escape_char,
1126: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1127: escape_char, escape_char, escape_char);
1.32 markus 1128: buffer_append(berr, string, strlen(string));
1.31 markus 1129: continue;
1130:
1131: case '#':
1.32 markus 1132: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1133: buffer_append(berr, string, strlen(string));
1.31 markus 1134: s = channel_open_message();
1135: buffer_append(berr, s, strlen(s));
1136: xfree(s);
1.97 jakob 1137: continue;
1138:
1139: case 'C':
1.99 markus 1140: process_cmdline();
1.31 markus 1141: continue;
1142:
1143: default:
1144: if (ch != escape_char) {
1145: buffer_put_char(bin, escape_char);
1146: bytes++;
1147: }
1148: /* Escaped characters fall through here */
1149: break;
1150: }
1151: } else {
1152: /*
1153: * The previous character was not an escape char. Check if this
1154: * is an escape.
1155: */
1156: if (last_was_cr && ch == escape_char) {
1157: /* It is. Set the flag and continue to next character. */
1158: escape_pending = 1;
1159: continue;
1160: }
1161: }
1162:
1163: /*
1164: * Normal character. Record whether it was a newline,
1165: * and append it to the buffer.
1166: */
1167: last_was_cr = (ch == '\r' || ch == '\n');
1168: buffer_put_char(bin, ch);
1169: bytes++;
1170: }
1171: return bytes;
1172: }
1173:
1.77 itojun 1174: static void
1.17 markus 1175: client_process_input(fd_set * readset)
1176: {
1.21 deraadt 1177: int len;
1.31 markus 1178: char buf[8192];
1.16 markus 1179:
1.11 markus 1180: /* Read input from stdin. */
1181: if (FD_ISSET(fileno(stdin), readset)) {
1182: /* Read as much as possible. */
1183: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1184: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1185: return; /* we'll try again later */
1.11 markus 1186: if (len <= 0) {
1.13 markus 1187: /*
1188: * Received EOF or error. They are treated
1189: * similarly, except that an error message is printed
1190: * if it was an error condition.
1191: */
1.11 markus 1192: if (len < 0) {
1193: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1194: buffer_append(&stderr_buffer, buf, strlen(buf));
1195: }
1196: /* Mark that we have seen EOF. */
1197: stdin_eof = 1;
1.13 markus 1198: /*
1199: * Send an EOF message to the server unless there is
1200: * data in the buffer. If there is data in the
1201: * buffer, no message will be sent now. Code
1202: * elsewhere will send the EOF when the buffer
1203: * becomes empty if stdin_eof is set.
1204: */
1.11 markus 1205: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1206: packet_start(SSH_CMSG_EOF);
1207: packet_send();
1.11 markus 1208: }
1.72 stevesk 1209: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1210: /*
1211: * Normal successful read, and no escape character.
1212: * Just append the data to buffer.
1213: */
1.11 markus 1214: buffer_append(&stdin_buffer, buf, len);
1215: } else {
1.13 markus 1216: /*
1217: * Normal, successful read. But we have an escape character
1218: * and have to process the characters one by one.
1219: */
1.52 markus 1220: if (process_escapes(&stdin_buffer, &stdout_buffer,
1221: &stderr_buffer, buf, len) == -1)
1.31 markus 1222: return;
1.11 markus 1223: }
1224: }
1225: }
1226:
1.77 itojun 1227: static void
1.11 markus 1228: client_process_output(fd_set * writeset)
1229: {
1230: int len;
1231: char buf[100];
1.1 deraadt 1232:
1.11 markus 1233: /* Write buffered output to stdout. */
1234: if (FD_ISSET(fileno(stdout), writeset)) {
1235: /* Write as much data as possible. */
1236: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1237: buffer_len(&stdout_buffer));
1.11 markus 1238: if (len <= 0) {
1.64 markus 1239: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1240: len = 0;
1241: else {
1.13 markus 1242: /*
1243: * An error or EOF was encountered. Put an
1244: * error message to stderr buffer.
1245: */
1.11 markus 1246: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1247: buffer_append(&stderr_buffer, buf, strlen(buf));
1248: quit_pending = 1;
1249: return;
1250: }
1251: }
1252: /* Consume printed data from the buffer. */
1253: buffer_consume(&stdout_buffer, len);
1.57 markus 1254: stdout_bytes += len;
1.11 markus 1255: }
1256: /* Write buffered output to stderr. */
1257: if (FD_ISSET(fileno(stderr), writeset)) {
1258: /* Write as much data as possible. */
1259: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1260: buffer_len(&stderr_buffer));
1.11 markus 1261: if (len <= 0) {
1.64 markus 1262: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1263: len = 0;
1264: else {
1.13 markus 1265: /* EOF or error, but can't even print error message. */
1.11 markus 1266: quit_pending = 1;
1267: return;
1268: }
1269: }
1270: /* Consume printed characters from the buffer. */
1271: buffer_consume(&stderr_buffer, len);
1.57 markus 1272: stderr_bytes += len;
1.11 markus 1273: }
1.1 deraadt 1274: }
1275:
1.13 markus 1276: /*
1.15 markus 1277: * Get packets from the connection input buffer, and process them as long as
1278: * there are packets available.
1279: *
1280: * Any unknown packets received during the actual
1281: * session cause the session to terminate. This is
1282: * intended to make debugging easier since no
1283: * confirmations are sent. Any compatible protocol
1284: * extensions must be negotiated during the
1285: * preparatory phase.
1286: */
1287:
1.77 itojun 1288: static void
1.49 itojun 1289: client_process_buffered_input_packets(void)
1.15 markus 1290: {
1.54 markus 1291: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1292: }
1293:
1.31 markus 1294: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1295:
1.77 itojun 1296: static int
1.31 markus 1297: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1298: {
1.31 markus 1299: /* XXX we assume c->extended is writeable */
1300: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1301: }
1302:
1.77 itojun 1303: static void
1.60 markus 1304: client_channel_closed(int id, void *arg)
1305: {
1.83 markus 1306: channel_cancel_cleanup(id);
1.60 markus 1307: session_closed = 1;
1.113 markus 1308: leave_raw_mode();
1.60 markus 1309: }
1310:
1.15 markus 1311: /*
1.13 markus 1312: * Implements the interactive session with the server. This is called after
1313: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1314: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1315: * used as an escape character for terminating or suspending the session.
1.13 markus 1316: */
1.1 deraadt 1317:
1.20 markus 1318: int
1.30 markus 1319: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1320: {
1.46 markus 1321: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1322: double start_time, total_time;
1.130 avsm 1323: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1324: u_int nalloc = 0;
1.11 markus 1325: char buf[100];
1326:
1327: debug("Entering interactive session.");
1328:
1329: start_time = get_current_time();
1330:
1331: /* Initialize variables. */
1332: escape_pending = 0;
1333: last_was_cr = 1;
1334: exit_status = -1;
1335: stdin_eof = 0;
1336: buffer_high = 64 * 1024;
1337: connection_in = packet_get_connection_in();
1338: connection_out = packet_get_connection_out();
1.46 markus 1339: max_fd = MAX(connection_in, connection_out);
1.123 djm 1340: if (control_fd != -1)
1341: max_fd = MAX(max_fd, control_fd);
1.46 markus 1342:
1343: if (!compat20) {
1.63 markus 1344: /* enable nonblocking unless tty */
1345: if (!isatty(fileno(stdin)))
1346: set_nonblock(fileno(stdin));
1347: if (!isatty(fileno(stdout)))
1348: set_nonblock(fileno(stdout));
1349: if (!isatty(fileno(stderr)))
1350: set_nonblock(fileno(stderr));
1.46 markus 1351: max_fd = MAX(max_fd, fileno(stdin));
1352: max_fd = MAX(max_fd, fileno(stdout));
1353: max_fd = MAX(max_fd, fileno(stderr));
1354: }
1.11 markus 1355: stdin_bytes = 0;
1356: stdout_bytes = 0;
1357: stderr_bytes = 0;
1358: quit_pending = 0;
1359: escape_char = escape_char_arg;
1360:
1361: /* Initialize buffers. */
1362: buffer_init(&stdin_buffer);
1363: buffer_init(&stdout_buffer);
1364: buffer_init(&stderr_buffer);
1365:
1.15 markus 1366: client_init_dispatch();
1367:
1.105 markus 1368: /*
1369: * Set signal handlers, (e.g. to restore non-blocking mode)
1370: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1371: */
1.131 djm 1372: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1373: signal(SIGHUP, signal_handler);
1.105 markus 1374: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1375: signal(SIGINT, signal_handler);
1376: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1377: signal(SIGQUIT, signal_handler);
1378: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1379: signal(SIGTERM, signal_handler);
1.132 djm 1380: signal(SIGWINCH, window_change_handler);
1.11 markus 1381:
1382: if (have_pty)
1383: enter_raw_mode();
1384:
1.48 markus 1385: if (compat20) {
1386: session_ident = ssh2_chan_id;
1.72 stevesk 1387: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1388: channel_register_filter(session_ident,
1389: simple_escape_filter);
1.60 markus 1390: if (session_ident != -1)
1391: channel_register_cleanup(session_ident,
1.143 djm 1392: client_channel_closed, 0);
1.48 markus 1393: } else {
1394: /* Check if we should immediately send eof on stdin. */
1.16 markus 1395: client_check_initial_eof_on_stdin();
1.48 markus 1396: }
1.30 markus 1397:
1.11 markus 1398: /* Main loop of the client for the interactive session mode. */
1399: while (!quit_pending) {
1400:
1.13 markus 1401: /* Process buffered packets sent by the server. */
1.11 markus 1402: client_process_buffered_input_packets();
1403:
1.60 markus 1404: if (compat20 && session_closed && !channel_still_open())
1405: break;
1406:
1.56 markus 1407: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1408:
1.56 markus 1409: if (rekeying) {
1410: debug("rekeying in progress");
1411: } else {
1412: /*
1413: * Make packets of buffered stdin data, and buffer
1414: * them for sending to the server.
1415: */
1416: if (!compat20)
1417: client_make_packets_from_stdin_data();
1.11 markus 1418:
1.56 markus 1419: /*
1420: * Make packets from buffered channel data, and
1421: * enqueue them for sending to the server.
1422: */
1423: if (packet_not_very_much_data_to_write())
1424: channel_output_poll();
1.11 markus 1425:
1.56 markus 1426: /*
1427: * Check if the window size has changed, and buffer a
1428: * message about it to the server if so.
1429: */
1430: client_check_window_change();
1.11 markus 1431:
1.56 markus 1432: if (quit_pending)
1433: break;
1434: }
1.13 markus 1435: /*
1436: * Wait until we have something to do (something becomes
1437: * available on one of the descriptors).
1438: */
1.81 markus 1439: max_fd2 = max_fd;
1.56 markus 1440: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1441: &max_fd2, &nalloc, rekeying);
1.11 markus 1442:
1443: if (quit_pending)
1444: break;
1445:
1.56 markus 1446: /* Do channel operations unless rekeying in progress. */
1447: if (!rekeying) {
1448: channel_after_select(readset, writeset);
1.108 markus 1449: if (need_rekeying || packet_need_rekeying()) {
1450: debug("need rekeying");
1.56 markus 1451: xxx_kex->done = 0;
1452: kex_send_kexinit(xxx_kex);
1453: need_rekeying = 0;
1454: }
1455: }
1.11 markus 1456:
1.17 markus 1457: /* Buffer input from the connection. */
1.46 markus 1458: client_process_net_input(readset);
1.17 markus 1459:
1.123 djm 1460: /* Accept control connections. */
1461: client_process_control(readset);
1462:
1.17 markus 1463: if (quit_pending)
1464: break;
1.11 markus 1465:
1.17 markus 1466: if (!compat20) {
1467: /* Buffer data from stdin */
1.46 markus 1468: client_process_input(readset);
1.17 markus 1469: /*
1470: * Process output to stdout and stderr. Output to
1471: * the connection is processed elsewhere (above).
1472: */
1.46 markus 1473: client_process_output(writeset);
1.17 markus 1474: }
1.11 markus 1475:
1.13 markus 1476: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1477: if (FD_ISSET(connection_out, writeset))
1.11 markus 1478: packet_write_poll();
1479: }
1.46 markus 1480: if (readset)
1481: xfree(readset);
1482: if (writeset)
1483: xfree(writeset);
1.11 markus 1484:
1485: /* Terminate the session. */
1486:
1487: /* Stop watching for window change. */
1.132 djm 1488: signal(SIGWINCH, SIG_DFL);
1.11 markus 1489:
1.76 markus 1490: channel_free_all();
1.11 markus 1491:
1.75 markus 1492: if (have_pty)
1493: leave_raw_mode();
1494:
1495: /* restore blocking io */
1496: if (!isatty(fileno(stdin)))
1497: unset_nonblock(fileno(stdin));
1498: if (!isatty(fileno(stdout)))
1499: unset_nonblock(fileno(stdout));
1500: if (!isatty(fileno(stderr)))
1501: unset_nonblock(fileno(stderr));
1.116 dtucker 1502:
1503: /*
1504: * If there was no shell or command requested, there will be no remote
1505: * exit status to be returned. In that case, clear error code if the
1506: * connection was deliberately terminated at this end.
1507: */
1508: if (no_shell_flag && received_signal == SIGTERM) {
1509: received_signal = 0;
1510: exit_status = 0;
1511: }
1.75 markus 1512:
1.113 markus 1513: if (received_signal)
1.89 itojun 1514: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1515:
1.13 markus 1516: /*
1517: * In interactive mode (with pseudo tty) display a message indicating
1518: * that the connection has been closed.
1519: */
1.11 markus 1520: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1521: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1522: buffer_append(&stderr_buffer, buf, strlen(buf));
1523: }
1.70 markus 1524:
1.11 markus 1525: /* Output any buffered data for stdout. */
1.70 markus 1526: while (buffer_len(&stdout_buffer) > 0) {
1527: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1528: buffer_len(&stdout_buffer));
1.70 markus 1529: if (len <= 0) {
1.11 markus 1530: error("Write failed flushing stdout buffer.");
1.70 markus 1531: break;
1532: }
1.11 markus 1533: buffer_consume(&stdout_buffer, len);
1.57 markus 1534: stdout_bytes += len;
1.11 markus 1535: }
1536:
1537: /* Output any buffered data for stderr. */
1.70 markus 1538: while (buffer_len(&stderr_buffer) > 0) {
1539: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1540: buffer_len(&stderr_buffer));
1.70 markus 1541: if (len <= 0) {
1.11 markus 1542: error("Write failed flushing stderr buffer.");
1.70 markus 1543: break;
1544: }
1.11 markus 1545: buffer_consume(&stderr_buffer, len);
1.57 markus 1546: stderr_bytes += len;
1.11 markus 1547: }
1548:
1549: /* Clear and free any buffers. */
1550: memset(buf, 0, sizeof(buf));
1551: buffer_free(&stdin_buffer);
1552: buffer_free(&stdout_buffer);
1553: buffer_free(&stderr_buffer);
1554:
1555: /* Report bytes transferred, and transfer rates. */
1556: total_time = get_current_time() - start_time;
1557: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1558: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1559: if (total_time > 0)
1560: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1561: stdin_bytes / total_time, stdout_bytes / total_time,
1562: stderr_bytes / total_time);
1.11 markus 1563:
1564: /* Return the exit status of the program. */
1565: debug("Exit status %d", exit_status);
1566: return exit_status;
1.15 markus 1567: }
1568:
1569: /*********/
1570:
1.77 itojun 1571: static void
1.94 markus 1572: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1573: {
1.42 markus 1574: u_int data_len;
1.15 markus 1575: char *data = packet_get_string(&data_len);
1.93 markus 1576: packet_check_eom();
1.15 markus 1577: buffer_append(&stdout_buffer, data, data_len);
1578: memset(data, 0, data_len);
1579: xfree(data);
1580: }
1.77 itojun 1581: static void
1.94 markus 1582: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1583: {
1.42 markus 1584: u_int data_len;
1.15 markus 1585: char *data = packet_get_string(&data_len);
1.93 markus 1586: packet_check_eom();
1.15 markus 1587: buffer_append(&stderr_buffer, data, data_len);
1588: memset(data, 0, data_len);
1589: xfree(data);
1590: }
1.77 itojun 1591: static void
1.94 markus 1592: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1593: {
1594: exit_status = packet_get_int();
1.93 markus 1595: packet_check_eom();
1.15 markus 1596: /* Acknowledge the exit. */
1597: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1598: packet_send();
1599: /*
1600: * Must wait for packet to be sent since we are
1601: * exiting the loop.
1602: */
1603: packet_write_wait();
1604: /* Flag that we want to exit. */
1605: quit_pending = 1;
1606: }
1.115 markus 1607: static void
1608: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1609: {
1610: Channel *c = NULL;
1611: int remote_id, sock;
1612:
1613: /* Read the remote channel number from the message. */
1614: remote_id = packet_get_int();
1615: packet_check_eom();
1616:
1617: /*
1618: * Get a connection to the local authentication agent (this may again
1619: * get forwarded).
1620: */
1621: sock = ssh_get_authentication_socket();
1622:
1623: /*
1624: * If we could not connect the agent, send an error message back to
1625: * the server. This should never happen unless the agent dies,
1626: * because authentication forwarding is only enabled if we have an
1627: * agent.
1628: */
1629: if (sock >= 0) {
1630: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1631: -1, 0, 0, 0, "authentication agent connection", 1);
1632: c->remote_id = remote_id;
1633: c->force_drain = 1;
1634: }
1635: if (c == NULL) {
1636: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1637: packet_put_int(remote_id);
1638: } else {
1639: /* Send a confirmation to the remote host. */
1640: debug("Forwarding authentication connection.");
1641: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1642: packet_put_int(remote_id);
1643: packet_put_int(c->self);
1644: }
1645: packet_send();
1646: }
1.15 markus 1647:
1.77 itojun 1648: static Channel *
1.40 markus 1649: client_request_forwarded_tcpip(const char *request_type, int rchan)
1650: {
1.103 deraadt 1651: Channel *c = NULL;
1.40 markus 1652: char *listen_address, *originator_address;
1653: int listen_port, originator_port;
1.67 markus 1654: int sock;
1.40 markus 1655:
1656: /* Get rest of the packet */
1657: listen_address = packet_get_string(NULL);
1658: listen_port = packet_get_int();
1659: originator_address = packet_get_string(NULL);
1660: originator_port = packet_get_int();
1.93 markus 1661: packet_check_eom();
1.40 markus 1662:
1663: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1664: listen_address, listen_port, originator_address, originator_port);
1665:
1.80 stevesk 1666: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1667: if (sock < 0) {
1668: xfree(originator_address);
1669: xfree(listen_address);
1670: return NULL;
1671: }
1672: c = channel_new("forwarded-tcpip",
1673: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1674: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1675: originator_address, 1);
1.40 markus 1676: xfree(originator_address);
1677: xfree(listen_address);
1678: return c;
1679: }
1680:
1.103 deraadt 1681: static Channel *
1.40 markus 1682: client_request_x11(const char *request_type, int rchan)
1683: {
1684: Channel *c = NULL;
1685: char *originator;
1686: int originator_port;
1.67 markus 1687: int sock;
1.40 markus 1688:
1689: if (!options.forward_x11) {
1690: error("Warning: ssh server tried X11 forwarding.");
1.148 ! stevesk 1691: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1692: return NULL;
1693: }
1694: originator = packet_get_string(NULL);
1695: if (datafellows & SSH_BUG_X11FWD) {
1696: debug2("buggy server: x11 request w/o originator_port");
1697: originator_port = 0;
1698: } else {
1699: originator_port = packet_get_int();
1700: }
1.93 markus 1701: packet_check_eom();
1.40 markus 1702: /* XXX check permission */
1.47 markus 1703: debug("client_request_x11: request from %s %d", originator,
1704: originator_port);
1.67 markus 1705: xfree(originator);
1.40 markus 1706: sock = x11_connect_display();
1.67 markus 1707: if (sock < 0)
1708: return NULL;
1709: c = channel_new("x11",
1710: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1711: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1712: c->force_drain = 1;
1.40 markus 1713: return c;
1714: }
1715:
1.103 deraadt 1716: static Channel *
1.40 markus 1717: client_request_agent(const char *request_type, int rchan)
1718: {
1719: Channel *c = NULL;
1.67 markus 1720: int sock;
1.40 markus 1721:
1722: if (!options.forward_agent) {
1723: error("Warning: ssh server tried agent forwarding.");
1.148 ! stevesk 1724: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1725: return NULL;
1726: }
1727: sock = ssh_get_authentication_socket();
1.67 markus 1728: if (sock < 0)
1729: return NULL;
1730: c = channel_new("authentication agent connection",
1731: SSH_CHANNEL_OPEN, sock, sock, -1,
1732: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1733: "authentication agent connection", 1);
1.82 markus 1734: c->force_drain = 1;
1.40 markus 1735: return c;
1736: }
1737:
1.22 markus 1738: /* XXXX move to generic input handler */
1.77 itojun 1739: static void
1.94 markus 1740: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1741: {
1742: Channel *c = NULL;
1743: char *ctype;
1744: int rchan;
1.102 markus 1745: u_int rmaxpack, rwindow, len;
1.22 markus 1746:
1747: ctype = packet_get_string(&len);
1748: rchan = packet_get_int();
1749: rwindow = packet_get_int();
1750: rmaxpack = packet_get_int();
1751:
1.24 markus 1752: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1753: ctype, rchan, rwindow, rmaxpack);
1754:
1.40 markus 1755: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1756: c = client_request_forwarded_tcpip(ctype, rchan);
1757: } else if (strcmp(ctype, "x11") == 0) {
1758: c = client_request_x11(ctype, rchan);
1759: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1760: c = client_request_agent(ctype, rchan);
1.22 markus 1761: }
1762: /* XXX duplicate : */
1763: if (c != NULL) {
1764: debug("confirm %s", ctype);
1765: c->remote_id = rchan;
1766: c->remote_window = rwindow;
1767: c->remote_maxpacket = rmaxpack;
1.69 markus 1768: if (c->type != SSH_CHANNEL_CONNECTING) {
1769: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1770: packet_put_int(c->remote_id);
1771: packet_put_int(c->self);
1772: packet_put_int(c->local_window);
1773: packet_put_int(c->local_maxpacket);
1774: packet_send();
1775: }
1.22 markus 1776: } else {
1777: debug("failure %s", ctype);
1778: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1779: packet_put_int(rchan);
1780: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1781: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1782: packet_put_cstring("open failed");
1.66 markus 1783: packet_put_cstring("");
1784: }
1.22 markus 1785: packet_send();
1786: }
1787: xfree(ctype);
1788: }
1.77 itojun 1789: static void
1.94 markus 1790: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1791: {
1792: Channel *c = NULL;
1.123 djm 1793: int exitval, id, reply, success = 0;
1.48 markus 1794: char *rtype;
1795:
1796: id = packet_get_int();
1797: rtype = packet_get_string(NULL);
1798: reply = packet_get_char();
1799:
1800: debug("client_input_channel_req: channel %d rtype %s reply %d",
1801: id, rtype, reply);
1802:
1.128 djm 1803: if (id == -1) {
1804: error("client_input_channel_req: request for channel -1");
1805: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1806: error("client_input_channel_req: channel %d: unknown channel", id);
1807: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1808: exitval = packet_get_int();
1809: if (id == session_ident) {
1810: success = 1;
1811: exit_status = exitval;
1812: } else if (c->ctl_fd == -1) {
1813: error("client_input_channel_req: unexpected channel %d",
1814: session_ident);
1815: } else {
1816: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1817: success = 1;
1818: }
1.93 markus 1819: packet_check_eom();
1.48 markus 1820: }
1821: if (reply) {
1822: packet_start(success ?
1823: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1824: packet_put_int(id);
1.48 markus 1825: packet_send();
1826: }
1827: xfree(rtype);
1828: }
1.95 markus 1829: static void
1830: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1831: {
1832: char *rtype;
1833: int want_reply;
1834: int success = 0;
1835:
1836: rtype = packet_get_string(NULL);
1837: want_reply = packet_get_char();
1.117 markus 1838: debug("client_input_global_request: rtype %s want_reply %d",
1839: rtype, want_reply);
1.95 markus 1840: if (want_reply) {
1841: packet_start(success ?
1842: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1843: packet_send();
1844: packet_write_wait();
1845: }
1846: xfree(rtype);
1847: }
1.22 markus 1848:
1.123 djm 1849: void
1.129 deraadt 1850: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1851: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1852: dispatch_fn *subsys_repl)
1853: {
1854: int len;
1.132 djm 1855: Channel *c = NULL;
1.123 djm 1856:
1857: debug2("%s: id %d", __func__, id);
1858:
1.132 djm 1859: if ((c = channel_lookup(id)) == NULL)
1860: fatal("client_session2_setup: channel %d: unknown channel", id);
1861:
1.123 djm 1862: if (want_tty) {
1863: struct winsize ws;
1864: struct termios tio;
1865:
1866: /* Store window size in the packet. */
1867: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1868: memset(&ws, 0, sizeof(ws));
1869:
1870: channel_request_start(id, "pty-req", 0);
1871: packet_put_cstring(term != NULL ? term : "");
1872: packet_put_int(ws.ws_col);
1873: packet_put_int(ws.ws_row);
1874: packet_put_int(ws.ws_xpixel);
1875: packet_put_int(ws.ws_ypixel);
1876: tio = get_saved_tio();
1877: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1878: packet_send();
1879: /* XXX wait for reply */
1.132 djm 1880: c->client_tty = 1;
1.123 djm 1881: }
1882:
1883: /* Transfer any environment variables from client to server */
1.126 djm 1884: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1885: int i, j, matched;
1886: char *name, *val;
1887:
1888: debug("Sending environment.");
1.126 djm 1889: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1890: /* Split */
1.126 djm 1891: name = xstrdup(env[i]);
1.123 djm 1892: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1893: xfree(name);
1.123 djm 1894: continue;
1895: }
1896: *val++ = '\0';
1897:
1898: matched = 0;
1899: for (j = 0; j < options.num_send_env; j++) {
1900: if (match_pattern(name, options.send_env[j])) {
1901: matched = 1;
1902: break;
1903: }
1904: }
1905: if (!matched) {
1906: debug3("Ignored env %s", name);
1.144 stevesk 1907: xfree(name);
1.123 djm 1908: continue;
1909: }
1910:
1911: debug("Sending env %s = %s", name, val);
1912: channel_request_start(id, "env", 0);
1913: packet_put_cstring(name);
1914: packet_put_cstring(val);
1915: packet_send();
1.144 stevesk 1916: xfree(name);
1.123 djm 1917: }
1918: }
1919:
1920: len = buffer_len(cmd);
1921: if (len > 0) {
1922: if (len > 900)
1923: len = 900;
1924: if (want_subsystem) {
1925: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1926: channel_request_start(id, "subsystem", subsys_repl != NULL);
1927: if (subsys_repl != NULL) {
1928: /* register callback for reply */
1929: /* XXX we assume that client_loop has already been called */
1930: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1931: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1932: }
1933: } else {
1934: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1935: channel_request_start(id, "exec", 0);
1936: }
1937: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1938: packet_send();
1939: } else {
1940: channel_request_start(id, "shell", 0);
1941: packet_send();
1942: }
1943: }
1944:
1.77 itojun 1945: static void
1.49 itojun 1946: client_init_dispatch_20(void)
1.16 markus 1947: {
1.55 markus 1948: dispatch_init(&dispatch_protocol_error);
1.100 markus 1949:
1.16 markus 1950: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1951: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1952: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1953: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1954: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1955: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1956: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1957: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1958: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1959: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1960:
1961: /* rekeying */
1962: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1963:
1964: /* global request reply messages */
1965: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1966: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1967: }
1.77 itojun 1968: static void
1.49 itojun 1969: client_init_dispatch_13(void)
1.15 markus 1970: {
1971: dispatch_init(NULL);
1972: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1973: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1974: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1975: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1976: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1977: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1978: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1979: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1980: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1981:
1982: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1983: &client_input_agent_open : &deny_input_open);
1.39 markus 1984: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1985: &x11_input_open : &deny_input_open);
1.15 markus 1986: }
1.77 itojun 1987: static void
1.49 itojun 1988: client_init_dispatch_15(void)
1.15 markus 1989: {
1990: client_init_dispatch_13();
1991: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1992: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1993: }
1.79 stevesk 1994: static void
1.49 itojun 1995: client_init_dispatch(void)
1.15 markus 1996: {
1.16 markus 1997: if (compat20)
1998: client_init_dispatch_20();
1999: else if (compat13)
1.15 markus 2000: client_init_dispatch_13();
2001: else
2002: client_init_dispatch_15();
1.113 markus 2003: }
2004:
2005: /* client specific fatal cleanup */
2006: void
1.114 markus 2007: cleanup_exit(int i)
1.113 markus 2008: {
2009: leave_raw_mode();
2010: leave_non_blocking();
1.123 djm 2011: if (options.control_path != NULL && control_fd != -1)
2012: unlink(options.control_path);
1.114 markus 2013: _exit(i);
1.1 deraadt 2014: }
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