Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.172
1.172 ! stevesk 1: /* $OpenBSD: clientloop.c,v 1.171 2006/07/25 02:59:21 stevesk Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
62: #include "includes.h"
1.152 stevesk 63:
64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/types.h>
66: #include <sys/stat.h>
1.166 stevesk 67: #include <sys/socket.h>
1.171 stevesk 68: #include <sys/time.h>
1.172 ! stevesk 69: #include <sys/param.h>
1.150 stevesk 70:
1.155 stevesk 71: #include <ctype.h>
1.168 stevesk 72: #include <errno.h>
1.151 stevesk 73: #include <paths.h>
1.153 stevesk 74: #include <signal.h>
1.170 stevesk 75: #include <string.h>
1.150 stevesk 76: #include <termios.h>
1.169 stevesk 77: #include <unistd.h>
1.1 deraadt 78:
1.45 markus 79: #include "ssh.h"
80: #include "ssh1.h"
81: #include "ssh2.h"
1.1 deraadt 82: #include "xmalloc.h"
83: #include "packet.h"
84: #include "buffer.h"
1.15 markus 85: #include "compat.h"
1.74 markus 86: #include "channels.h"
1.15 markus 87: #include "dispatch.h"
1.30 markus 88: #include "buffer.h"
89: #include "bufaux.h"
1.40 markus 90: #include "key.h"
1.54 markus 91: #include "kex.h"
1.45 markus 92: #include "log.h"
93: #include "readconf.h"
94: #include "clientloop.h"
1.147 djm 95: #include "sshconnect.h"
1.40 markus 96: #include "authfd.h"
1.45 markus 97: #include "atomicio.h"
1.118 deraadt 98: #include "sshpty.h"
1.63 markus 99: #include "misc.h"
1.123 djm 100: #include "monitor_fdpass.h"
101: #include "match.h"
102: #include "msg.h"
1.39 markus 103:
104: /* import options */
105: extern Options options;
106:
1.1 deraadt 107: /* Flag indicating that stdin should be redirected from /dev/null. */
108: extern int stdin_null_flag;
109:
1.116 dtucker 110: /* Flag indicating that no shell has been requested */
111: extern int no_shell_flag;
112:
1.123 djm 113: /* Control socket */
114: extern int control_fd;
115:
1.13 markus 116: /*
117: * Name of the host we are connecting to. This is the name given on the
118: * command line, or the HostName specified for the user-supplied name in a
119: * configuration file.
120: */
1.1 deraadt 121: extern char *host;
122:
1.13 markus 123: /*
124: * Flag to indicate that we have received a window change signal which has
125: * not yet been processed. This will cause a message indicating the new
126: * window size to be sent to the server a little later. This is volatile
127: * because this is updated in a signal handler.
128: */
1.88 markus 129: static volatile sig_atomic_t received_window_change_signal = 0;
130: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 131:
1.145 djm 132: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 133: static int in_non_blocking_mode = 0;
134:
135: /* Common data for the client loop code. */
1.162 djm 136: static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.31 markus 137: static int escape_char; /* Escape character. */
1.11 markus 138: static int escape_pending; /* Last character was the escape character */
139: static int last_was_cr; /* Last character was a newline. */
140: static int exit_status; /* Used to store the exit status of the command. */
141: static int stdin_eof; /* EOF has been encountered on standard error. */
142: static Buffer stdin_buffer; /* Buffer for stdin data. */
143: static Buffer stdout_buffer; /* Buffer for stdout data. */
144: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 145: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
146: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 147: static int connection_in; /* Connection to server (input). */
148: static int connection_out; /* Connection to server (output). */
1.56 markus 149: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 150: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 151: static int server_alive_timeouts = 0;
1.1 deraadt 152:
1.77 itojun 153: static void client_init_dispatch(void);
1.16 markus 154: int session_ident = -1;
155:
1.123 djm 156: struct confirm_ctx {
157: int want_tty;
158: int want_subsys;
1.140 djm 159: int want_x_fwd;
160: int want_agent_fwd;
1.123 djm 161: Buffer cmd;
162: char *term;
163: struct termios tio;
1.126 djm 164: char **env;
1.123 djm 165: };
166:
1.54 markus 167: /*XXX*/
168: extern Kex *xxx_kex;
169:
1.123 djm 170: void ssh_process_session2_setup(int, int, int, Buffer *);
171:
1.1 deraadt 172: /* Restores stdin to blocking mode. */
173:
1.77 itojun 174: static void
1.49 itojun 175: leave_non_blocking(void)
1.1 deraadt 176: {
1.11 markus 177: if (in_non_blocking_mode) {
1.125 djm 178: unset_nonblock(fileno(stdin));
1.11 markus 179: in_non_blocking_mode = 0;
180: }
1.1 deraadt 181: }
182:
1.11 markus 183: /* Puts stdin terminal in non-blocking mode. */
184:
1.77 itojun 185: static void
1.49 itojun 186: enter_non_blocking(void)
1.1 deraadt 187: {
1.11 markus 188: in_non_blocking_mode = 1;
1.124 djm 189: set_nonblock(fileno(stdin));
1.1 deraadt 190: }
191:
1.13 markus 192: /*
193: * Signal handler for the window change signal (SIGWINCH). This just sets a
194: * flag indicating that the window has changed.
195: */
1.157 deraadt 196: /*ARGSUSED */
1.77 itojun 197: static void
1.11 markus 198: window_change_handler(int sig)
1.1 deraadt 199: {
1.11 markus 200: received_window_change_signal = 1;
201: signal(SIGWINCH, window_change_handler);
1.1 deraadt 202: }
203:
1.13 markus 204: /*
205: * Signal handler for signals that cause the program to terminate. These
206: * signals must be trapped to restore terminal modes.
207: */
1.157 deraadt 208: /*ARGSUSED */
1.77 itojun 209: static void
1.11 markus 210: signal_handler(int sig)
1.1 deraadt 211: {
1.75 markus 212: received_signal = sig;
213: quit_pending = 1;
1.1 deraadt 214: }
215:
1.13 markus 216: /*
217: * Returns current time in seconds from Jan 1, 1970 with the maximum
218: * available resolution.
219: */
1.1 deraadt 220:
1.77 itojun 221: static double
1.49 itojun 222: get_current_time(void)
1.1 deraadt 223: {
1.11 markus 224: struct timeval tv;
225: gettimeofday(&tv, NULL);
226: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 227: }
228:
229: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
230: void
231: client_x11_get_proto(const char *display, const char *xauth_path,
232: u_int trusted, char **_proto, char **_data)
233: {
234: char cmd[1024];
235: char line[512];
236: char xdisplay[512];
237: static char proto[512], data[512];
238: FILE *f;
239: int got_data = 0, generated = 0, do_unlink = 0, i;
240: char *xauthdir, *xauthfile;
241: struct stat st;
242:
243: xauthdir = xauthfile = NULL;
244: *_proto = proto;
245: *_data = data;
246: proto[0] = data[0] = '\0';
247:
248: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
249: debug("No xauth program.");
250: } else {
251: if (display == NULL) {
252: debug("x11_get_proto: DISPLAY not set");
253: return;
254: }
255: /*
256: * Handle FamilyLocal case where $DISPLAY does
257: * not match an authorization entry. For this we
258: * just try "xauth list unix:displaynum.screennum".
259: * XXX: "localhost" match to determine FamilyLocal
260: * is not perfect.
261: */
262: if (strncmp(display, "localhost:", 10) == 0) {
263: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
264: display + 10);
265: display = xdisplay;
266: }
267: if (trusted == 0) {
268: xauthdir = xmalloc(MAXPATHLEN);
269: xauthfile = xmalloc(MAXPATHLEN);
270: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
271: if (mkdtemp(xauthdir) != NULL) {
272: do_unlink = 1;
273: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
274: xauthdir);
275: snprintf(cmd, sizeof(cmd),
276: "%s -f %s generate %s " SSH_X11_PROTO
277: " untrusted timeout 1200 2>" _PATH_DEVNULL,
278: xauth_path, xauthfile, display);
279: debug2("x11_get_proto: %s", cmd);
280: if (system(cmd) == 0)
281: generated = 1;
282: }
283: }
284: snprintf(cmd, sizeof(cmd),
1.142 markus 285: "%s %s%s list %s 2>" _PATH_DEVNULL,
1.138 djm 286: xauth_path,
287: generated ? "-f " : "" ,
288: generated ? xauthfile : "",
289: display);
290: debug2("x11_get_proto: %s", cmd);
291: f = popen(cmd, "r");
292: if (f && fgets(line, sizeof(line), f) &&
293: sscanf(line, "%*s %511s %511s", proto, data) == 2)
294: got_data = 1;
295: if (f)
296: pclose(f);
297: }
298:
299: if (do_unlink) {
300: unlink(xauthfile);
301: rmdir(xauthdir);
302: }
303: if (xauthdir)
304: xfree(xauthdir);
305: if (xauthfile)
306: xfree(xauthfile);
307:
308: /*
309: * If we didn't get authentication data, just make up some
310: * data. The forwarding code will check the validity of the
311: * response anyway, and substitute this data. The X11
312: * server, however, will ignore this fake data and use
313: * whatever authentication mechanisms it was using otherwise
314: * for the local connection.
315: */
316: if (!got_data) {
317: u_int32_t rnd = 0;
318:
319: logit("Warning: No xauth data; "
320: "using fake authentication data for X11 forwarding.");
321: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
322: for (i = 0; i < 16; i++) {
323: if (i % 4 == 0)
324: rnd = arc4random();
325: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
326: rnd & 0xff);
327: rnd >>= 8;
328: }
329: }
1.1 deraadt 330: }
331:
1.13 markus 332: /*
333: * This is called when the interactive is entered. This checks if there is
334: * an EOF coming on stdin. We must check this explicitly, as select() does
335: * not appear to wake up when redirecting from /dev/null.
336: */
1.1 deraadt 337:
1.77 itojun 338: static void
1.49 itojun 339: client_check_initial_eof_on_stdin(void)
1.1 deraadt 340: {
1.11 markus 341: int len;
342: char buf[1];
1.1 deraadt 343:
1.13 markus 344: /*
345: * If standard input is to be "redirected from /dev/null", we simply
346: * mark that we have seen an EOF and send an EOF message to the
347: * server. Otherwise, we try to read a single character; it appears
348: * that for some files, such /dev/null, select() never wakes up for
349: * read for this descriptor, which means that we never get EOF. This
350: * way we will get the EOF if stdin comes from /dev/null or similar.
351: */
1.11 markus 352: if (stdin_null_flag) {
353: /* Fake EOF on stdin. */
354: debug("Sending eof.");
355: stdin_eof = 1;
356: packet_start(SSH_CMSG_EOF);
357: packet_send();
358: } else {
359: enter_non_blocking();
360:
361: /* Check for immediate EOF on stdin. */
362: len = read(fileno(stdin), buf, 1);
363: if (len == 0) {
1.13 markus 364: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 365: debug("Sending eof.");
366: stdin_eof = 1;
367: packet_start(SSH_CMSG_EOF);
368: packet_send();
369: } else if (len > 0) {
1.13 markus 370: /*
371: * Got data. We must store the data in the buffer,
372: * and also process it as an escape character if
373: * appropriate.
374: */
1.42 markus 375: if ((u_char) buf[0] == escape_char)
1.11 markus 376: escape_pending = 1;
1.52 markus 377: else
1.11 markus 378: buffer_append(&stdin_buffer, buf, 1);
379: }
380: leave_non_blocking();
381: }
1.1 deraadt 382: }
383:
384:
1.13 markus 385: /*
386: * Make packets from buffered stdin data, and buffer them for sending to the
387: * connection.
388: */
1.1 deraadt 389:
1.77 itojun 390: static void
1.49 itojun 391: client_make_packets_from_stdin_data(void)
1.1 deraadt 392: {
1.42 markus 393: u_int len;
1.1 deraadt 394:
1.11 markus 395: /* Send buffered stdin data to the server. */
396: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 397: packet_not_very_much_data_to_write()) {
1.11 markus 398: len = buffer_len(&stdin_buffer);
399: /* Keep the packets at reasonable size. */
400: if (len > packet_get_maxsize())
401: len = packet_get_maxsize();
402: packet_start(SSH_CMSG_STDIN_DATA);
403: packet_put_string(buffer_ptr(&stdin_buffer), len);
404: packet_send();
405: buffer_consume(&stdin_buffer, len);
1.52 markus 406: stdin_bytes += len;
1.11 markus 407: /* If we have a pending EOF, send it now. */
408: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
409: packet_start(SSH_CMSG_EOF);
410: packet_send();
411: }
1.1 deraadt 412: }
413: }
414:
1.13 markus 415: /*
416: * Checks if the client window has changed, and sends a packet about it to
417: * the server if so. The actual change is detected elsewhere (by a software
418: * interrupt on Unix); this just checks the flag and sends a message if
419: * appropriate.
420: */
1.1 deraadt 421:
1.77 itojun 422: static void
1.49 itojun 423: client_check_window_change(void)
1.1 deraadt 424: {
1.16 markus 425: struct winsize ws;
426:
427: if (! received_window_change_signal)
428: return;
429: /** XXX race */
430: received_window_change_signal = 0;
431:
1.37 markus 432: debug2("client_check_window_change: changed");
1.16 markus 433:
434: if (compat20) {
1.123 djm 435: channel_send_window_changes();
1.16 markus 436: } else {
1.123 djm 437: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
438: return;
1.16 markus 439: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 440: packet_put_int((u_int)ws.ws_row);
441: packet_put_int((u_int)ws.ws_col);
442: packet_put_int((u_int)ws.ws_xpixel);
443: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 444: packet_send();
1.1 deraadt 445: }
446: }
447:
1.117 markus 448: static void
449: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
450: {
451: server_alive_timeouts = 0;
452: client_global_request_reply_fwd(type, seq, ctxt);
453: }
454:
455: static void
456: server_alive_check(void)
457: {
458: if (++server_alive_timeouts > options.server_alive_count_max)
459: packet_disconnect("Timeout, server not responding.");
460: packet_start(SSH2_MSG_GLOBAL_REQUEST);
461: packet_put_cstring("keepalive@openssh.com");
462: packet_put_char(1); /* boolean: want reply */
463: packet_send();
464: }
465:
1.13 markus 466: /*
467: * Waits until the client can do something (some data becomes available on
468: * one of the file descriptors).
469: */
1.77 itojun 470: static void
1.46 markus 471: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 472: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 473: {
1.117 markus 474: struct timeval tv, *tvp;
475: int ret;
476:
1.46 markus 477: /* Add any selections by the channel mechanism. */
1.81 markus 478: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 479:
1.16 markus 480: if (!compat20) {
1.17 markus 481: /* Read from the connection, unless our buffers are full. */
1.16 markus 482: if (buffer_len(&stdout_buffer) < buffer_high &&
483: buffer_len(&stderr_buffer) < buffer_high &&
484: channel_not_very_much_buffered_data())
1.46 markus 485: FD_SET(connection_in, *readsetp);
1.17 markus 486: /*
487: * Read from stdin, unless we have seen EOF or have very much
488: * buffered data to send to the server.
489: */
490: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 491: FD_SET(fileno(stdin), *readsetp);
1.17 markus 492:
493: /* Select stdout/stderr if have data in buffer. */
494: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 495: FD_SET(fileno(stdout), *writesetp);
1.17 markus 496: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 497: FD_SET(fileno(stderr), *writesetp);
1.16 markus 498: } else {
1.71 markus 499: /* channel_prepare_select could have closed the last channel */
1.84 markus 500: if (session_closed && !channel_still_open() &&
501: !packet_have_data_to_write()) {
502: /* clear mask since we did not call select() */
1.87 markus 503: memset(*readsetp, 0, *nallocp);
504: memset(*writesetp, 0, *nallocp);
1.84 markus 505: return;
1.71 markus 506: } else {
507: FD_SET(connection_in, *readsetp);
508: }
1.16 markus 509: }
1.11 markus 510:
511: /* Select server connection if have data to write to the server. */
512: if (packet_have_data_to_write())
1.46 markus 513: FD_SET(connection_out, *writesetp);
1.11 markus 514:
1.123 djm 515: if (control_fd != -1)
516: FD_SET(control_fd, *readsetp);
517:
1.13 markus 518: /*
519: * Wait for something to happen. This will suspend the process until
520: * some selected descriptor can be read, written, or has some other
1.117 markus 521: * event pending.
1.13 markus 522: */
1.11 markus 523:
1.117 markus 524: if (options.server_alive_interval == 0 || !compat20)
525: tvp = NULL;
1.129 deraadt 526: else {
1.117 markus 527: tv.tv_sec = options.server_alive_interval;
528: tv.tv_usec = 0;
529: tvp = &tv;
530: }
531: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
532: if (ret < 0) {
1.11 markus 533: char buf[100];
1.51 markus 534:
535: /*
536: * We have to clear the select masks, because we return.
537: * We have to return, because the mainloop checks for the flags
538: * set by the signal handlers.
539: */
1.87 markus 540: memset(*readsetp, 0, *nallocp);
541: memset(*writesetp, 0, *nallocp);
1.50 deraadt 542:
1.11 markus 543: if (errno == EINTR)
544: return;
545: /* Note: we might still have data in the buffers. */
546: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
547: buffer_append(&stderr_buffer, buf, strlen(buf));
548: quit_pending = 1;
1.117 markus 549: } else if (ret == 0)
550: server_alive_check();
1.11 markus 551: }
552:
1.77 itojun 553: static void
1.31 markus 554: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 555: {
1.11 markus 556: /* Flush stdout and stderr buffers. */
1.31 markus 557: if (buffer_len(bout) > 0)
1.112 deraadt 558: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 559: if (buffer_len(berr) > 0)
1.112 deraadt 560: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 561:
562: leave_raw_mode();
563:
1.13 markus 564: /*
565: * Free (and clear) the buffer to reduce the amount of data that gets
566: * written to swap.
567: */
1.31 markus 568: buffer_free(bin);
569: buffer_free(bout);
570: buffer_free(berr);
1.11 markus 571:
572: /* Send the suspend signal to the program itself. */
573: kill(getpid(), SIGTSTP);
574:
1.132 djm 575: /* Reset window sizes in case they have changed */
576: received_window_change_signal = 1;
1.11 markus 577:
578: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 579: buffer_init(bin);
580: buffer_init(bout);
581: buffer_init(berr);
1.11 markus 582:
583: enter_raw_mode();
584: }
585:
1.77 itojun 586: static void
1.161 deraadt 587: client_process_net_input(fd_set *readset)
1.11 markus 588: {
1.17 markus 589: int len;
590: char buf[8192];
1.11 markus 591:
1.13 markus 592: /*
593: * Read input from the server, and add any such data to the buffer of
594: * the packet subsystem.
595: */
1.11 markus 596: if (FD_ISSET(connection_in, readset)) {
597: /* Read as much as possible. */
598: len = read(connection_in, buf, sizeof(buf));
599: if (len == 0) {
600: /* Received EOF. The remote host has closed the connection. */
601: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
602: host);
1.1 deraadt 603: buffer_append(&stderr_buffer, buf, strlen(buf));
604: quit_pending = 1;
605: return;
1.11 markus 606: }
1.13 markus 607: /*
608: * There is a kernel bug on Solaris that causes select to
609: * sometimes wake up even though there is no data available.
610: */
1.53 millert 611: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 612: len = 0;
613:
614: if (len < 0) {
615: /* An error has encountered. Perhaps there is a network problem. */
616: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
617: host, strerror(errno));
618: buffer_append(&stderr_buffer, buf, strlen(buf));
619: quit_pending = 1;
620: return;
621: }
622: packet_process_incoming(buf, len);
623: }
1.17 markus 624: }
1.16 markus 625:
1.97 jakob 626: static void
1.123 djm 627: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
628: {
629: int id;
630: Channel *c;
1.129 deraadt 631:
1.123 djm 632: id = packet_get_int();
633: packet_check_eom();
634:
635: if ((c = channel_lookup(id)) == NULL) {
636: error("%s: no channel for id %d", __func__, id);
637: return;
638: }
639:
640: if (type == SSH2_MSG_CHANNEL_SUCCESS)
641: debug2("Request suceeded on channel %d", id);
642: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
643: error("Request failed on channel %d", id);
644: channel_free(c);
645: }
646: }
647:
648: static void
649: client_extra_session2_setup(int id, void *arg)
650: {
651: struct confirm_ctx *cctx = arg;
1.140 djm 652: const char *display;
1.123 djm 653: Channel *c;
1.126 djm 654: int i;
1.129 deraadt 655:
1.123 djm 656: if (cctx == NULL)
657: fatal("%s: cctx == NULL", __func__);
658: if ((c = channel_lookup(id)) == NULL)
659: fatal("%s: no channel for id %d", __func__, id);
660:
1.141 djm 661: display = getenv("DISPLAY");
1.140 djm 662: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
663: char *proto, *data;
664: /* Get reasonable local authentication information. */
665: client_x11_get_proto(display, options.xauth_location,
666: options.forward_x11_trusted, &proto, &data);
667: /* Request forwarding with authentication spoofing. */
668: debug("Requesting X11 forwarding with authentication spoofing.");
669: x11_request_forwarding_with_spoofing(id, display, proto, data);
670: /* XXX wait for reply */
671: }
672:
673: if (cctx->want_agent_fwd && options.forward_agent) {
674: debug("Requesting authentication agent forwarding.");
675: channel_request_start(id, "auth-agent-req@openssh.com", 0);
676: packet_send();
677: }
678:
1.129 deraadt 679: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 680: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 681: client_subsystem_reply);
1.127 djm 682:
1.123 djm 683: c->confirm_ctx = NULL;
684: buffer_free(&cctx->cmd);
1.126 djm 685: xfree(cctx->term);
686: if (cctx->env != NULL) {
687: for (i = 0; cctx->env[i] != NULL; i++)
688: xfree(cctx->env[i]);
689: xfree(cctx->env);
1.129 deraadt 690: }
1.126 djm 691: xfree(cctx);
1.123 djm 692: }
693:
694: static void
1.161 deraadt 695: client_process_control(fd_set *readset)
1.123 djm 696: {
697: Buffer m;
698: Channel *c;
1.139 djm 699: int client_fd, new_fd[3], ver, allowed;
1.123 djm 700: socklen_t addrlen;
701: struct sockaddr_storage addr;
702: struct confirm_ctx *cctx;
703: char *cmd;
1.139 djm 704: u_int i, len, env_len, command, flags;
1.123 djm 705: uid_t euid;
706: gid_t egid;
707:
708: /*
709: * Accept connection on control socket
710: */
711: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
712: return;
713:
714: memset(&addr, 0, sizeof(addr));
715: addrlen = sizeof(addr);
716: if ((client_fd = accept(control_fd,
717: (struct sockaddr*)&addr, &addrlen)) == -1) {
718: error("%s accept: %s", __func__, strerror(errno));
719: return;
720: }
721:
722: if (getpeereid(client_fd, &euid, &egid) < 0) {
723: error("%s getpeereid failed: %s", __func__, strerror(errno));
724: close(client_fd);
725: return;
726: }
727: if ((euid != 0) && (getuid() != euid)) {
728: error("control mode uid mismatch: peer euid %u != uid %u",
729: (u_int) euid, (u_int) getuid());
730: close(client_fd);
731: return;
732: }
1.127 djm 733:
1.134 djm 734: unset_nonblock(client_fd);
735:
736: /* Read command */
737: buffer_init(&m);
738: if (ssh_msg_recv(client_fd, &m) == -1) {
739: error("%s: client msg_recv failed", __func__);
740: close(client_fd);
741: buffer_free(&m);
742: return;
743: }
1.140 djm 744: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 745: error("%s: wrong client version %d", __func__, ver);
746: buffer_free(&m);
747: close(client_fd);
748: return;
749: }
750:
1.127 djm 751: allowed = 1;
1.134 djm 752: command = buffer_get_int(&m);
753: flags = buffer_get_int(&m);
1.123 djm 754:
1.134 djm 755: buffer_clear(&m);
1.123 djm 756:
1.134 djm 757: switch (command) {
758: case SSHMUX_COMMAND_OPEN:
1.137 djm 759: if (options.control_master == SSHCTL_MASTER_ASK ||
760: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 761: allowed = ask_permission("Allow shared connection "
762: "to %s? ", host);
763: /* continue below */
764: break;
765: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 766: if (options.control_master == SSHCTL_MASTER_ASK ||
767: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 768: allowed = ask_permission("Terminate shared connection "
769: "to %s? ", host);
770: if (allowed)
771: quit_pending = 1;
1.136 deraadt 772: /* FALLTHROUGH */
1.134 djm 773: case SSHMUX_COMMAND_ALIVE_CHECK:
774: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
775: buffer_clear(&m);
776: buffer_put_int(&m, allowed);
777: buffer_put_int(&m, getpid());
1.140 djm 778: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 779: error("%s: client msg_send failed", __func__);
780: close(client_fd);
781: buffer_free(&m);
782: return;
783: }
784: buffer_free(&m);
785: close(client_fd);
786: return;
787: default:
788: error("Unsupported command %d", command);
789: buffer_free(&m);
790: close(client_fd);
791: return;
792: }
1.123 djm 793:
1.134 djm 794: /* Reply for SSHMUX_COMMAND_OPEN */
795: buffer_clear(&m);
1.127 djm 796: buffer_put_int(&m, allowed);
1.123 djm 797: buffer_put_int(&m, getpid());
1.140 djm 798: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 799: error("%s: client msg_send failed", __func__);
800: close(client_fd);
1.127 djm 801: buffer_free(&m);
1.123 djm 802: return;
803: }
804:
1.127 djm 805: if (!allowed) {
806: error("Refused control connection");
807: close(client_fd);
808: buffer_free(&m);
809: return;
810: }
811:
1.134 djm 812: buffer_clear(&m);
1.123 djm 813: if (ssh_msg_recv(client_fd, &m) == -1) {
814: error("%s: client msg_recv failed", __func__);
815: close(client_fd);
1.127 djm 816: buffer_free(&m);
1.123 djm 817: return;
818: }
1.140 djm 819: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 820: error("%s: wrong client version %d", __func__, ver);
821: buffer_free(&m);
822: close(client_fd);
823: return;
824: }
825:
1.159 djm 826: cctx = xcalloc(1, sizeof(*cctx));
1.134 djm 827: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
828: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 829: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
830: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 831: cctx->term = buffer_get_string(&m, &len);
832:
833: cmd = buffer_get_string(&m, &len);
834: buffer_init(&cctx->cmd);
835: buffer_append(&cctx->cmd, cmd, strlen(cmd));
836:
1.126 djm 837: env_len = buffer_get_int(&m);
838: env_len = MIN(env_len, 4096);
839: debug3("%s: receiving %d env vars", __func__, env_len);
840: if (env_len != 0) {
1.159 djm 841: cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
1.126 djm 842: for (i = 0; i < env_len; i++)
843: cctx->env[i] = buffer_get_string(&m, &len);
844: cctx->env[i] = NULL;
845: }
846:
1.123 djm 847: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
848: cctx->want_tty, cctx->want_subsys, cmd);
1.163 markus 849: xfree(cmd);
1.123 djm 850:
851: /* Gather fds from client */
852: new_fd[0] = mm_receive_fd(client_fd);
853: new_fd[1] = mm_receive_fd(client_fd);
854: new_fd[2] = mm_receive_fd(client_fd);
855:
856: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
857: new_fd[0], new_fd[1], new_fd[2]);
858:
859: /* Try to pick up ttymodes from client before it goes raw */
860: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
861: error("%s: tcgetattr: %s", __func__, strerror(errno));
862:
1.134 djm 863: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 864: buffer_clear(&m);
1.140 djm 865: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 866: error("%s: client msg_send failed", __func__);
867: close(client_fd);
868: close(new_fd[0]);
869: close(new_fd[1]);
870: close(new_fd[2]);
1.127 djm 871: buffer_free(&m);
1.134 djm 872: xfree(cctx->term);
873: if (env_len != 0) {
874: for (i = 0; i < env_len; i++)
875: xfree(cctx->env[i]);
876: xfree(cctx->env);
877: }
1.123 djm 878: return;
879: }
880: buffer_free(&m);
881:
882: /* enable nonblocking unless tty */
883: if (!isatty(new_fd[0]))
884: set_nonblock(new_fd[0]);
885: if (!isatty(new_fd[1]))
886: set_nonblock(new_fd[1]);
887: if (!isatty(new_fd[2]))
888: set_nonblock(new_fd[2]);
889:
890: set_nonblock(client_fd);
891:
1.129 deraadt 892: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 893: new_fd[0], new_fd[1], new_fd[2],
894: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
895: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
896:
897: /* XXX */
898: c->ctl_fd = client_fd;
899:
900: debug3("%s: channel_new: %d", __func__, c->self);
901:
902: channel_send_open(c->self);
903: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
904: }
905:
906: static void
1.99 markus 907: process_cmdline(void)
1.97 jakob 908: {
909: void (*handler)(int);
1.135 djm 910: char *s, *cmd, *cancel_host;
1.121 djm 911: int delete = 0;
1.97 jakob 912: int local = 0;
1.135 djm 913: u_short cancel_port;
914: Forward fwd;
1.97 jakob 915:
916: leave_raw_mode();
1.101 markus 917: handler = signal(SIGINT, SIG_IGN);
1.99 markus 918: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 919: if (s == NULL)
920: goto out;
921: while (*s && isspace(*s))
922: s++;
1.121 djm 923: if (*s == '-')
924: s++; /* Skip cmdline '-', if any */
1.120 dtucker 925: if (*s == '\0')
1.97 jakob 926: goto out;
1.121 djm 927:
1.122 djm 928: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 929: logit("Commands:");
1.164 djm 930: logit(" -L[bind_address:]port:host:hostport "
931: "Request local forward");
932: logit(" -R[bind_address:]port:host:hostport "
933: "Request remote forward");
1.165 stevesk 934: logit(" -KR[bind_address:]port "
1.164 djm 935: "Cancel remote forward");
1.146 reyk 936: if (!options.permit_local_command)
937: goto out;
1.164 djm 938: logit(" !args "
939: "Execute local command");
1.146 reyk 940: goto out;
941: }
942:
943: if (*s == '!' && options.permit_local_command) {
944: s++;
945: ssh_local_cmd(s);
1.121 djm 946: goto out;
947: }
948:
949: if (*s == 'K') {
950: delete = 1;
951: s++;
952: }
953: if (*s != 'L' && *s != 'R') {
1.109 itojun 954: logit("Invalid command.");
1.97 jakob 955: goto out;
956: }
1.121 djm 957: if (*s == 'L')
1.97 jakob 958: local = 1;
1.121 djm 959: if (local && delete) {
960: logit("Not supported.");
961: goto out;
962: }
963: if ((!local || delete) && !compat20) {
1.109 itojun 964: logit("Not supported for SSH protocol version 1.");
1.97 jakob 965: goto out;
966: }
1.121 djm 967:
968: s++;
1.97 jakob 969: while (*s && isspace(*s))
970: s++;
971:
1.121 djm 972: if (delete) {
1.135 djm 973: cancel_port = 0;
974: cancel_host = hpdelim(&s); /* may be NULL */
975: if (s != NULL) {
976: cancel_port = a2port(s);
977: cancel_host = cleanhostname(cancel_host);
978: } else {
979: cancel_port = a2port(cancel_host);
980: cancel_host = NULL;
1.121 djm 981: }
1.135 djm 982: if (cancel_port == 0) {
983: logit("Bad forwarding close port");
1.121 djm 984: goto out;
985: }
1.135 djm 986: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 987: } else {
1.135 djm 988: if (!parse_forward(&fwd, s)) {
1.121 djm 989: logit("Bad forwarding specification.");
990: goto out;
991: }
992: if (local) {
1.135 djm 993: if (channel_setup_local_fwd_listener(fwd.listen_host,
994: fwd.listen_port, fwd.connect_host,
995: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 996: logit("Port forwarding failed.");
997: goto out;
998: }
1.135 djm 999: } else {
1.167 markus 1000: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 1001: fwd.listen_port, fwd.connect_host,
1.167 markus 1002: fwd.connect_port) < 0) {
1003: logit("Port forwarding failed.");
1004: goto out;
1005: }
1.135 djm 1006: }
1007:
1.121 djm 1008: logit("Forwarding port.");
1009: }
1010:
1.97 jakob 1011: out:
1012: signal(SIGINT, handler);
1013: enter_raw_mode();
1014: if (cmd)
1015: xfree(cmd);
1016: }
1017:
1.31 markus 1018: /* process the characters one by one */
1.77 itojun 1019: static int
1.31 markus 1020: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1021: {
1.32 markus 1022: char string[1024];
1.31 markus 1023: pid_t pid;
1024: int bytes = 0;
1.42 markus 1025: u_int i;
1026: u_char ch;
1.31 markus 1027: char *s;
1028:
1.139 djm 1029: if (len <= 0)
1030: return (0);
1031:
1032: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1033: /* Get one character at a time. */
1034: ch = buf[i];
1035:
1036: if (escape_pending) {
1037: /* We have previously seen an escape character. */
1038: /* Clear the flag now. */
1039: escape_pending = 0;
1040:
1041: /* Process the escaped character. */
1042: switch (ch) {
1043: case '.':
1044: /* Terminate the connection. */
1.32 markus 1045: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1046: buffer_append(berr, string, strlen(string));
1.31 markus 1047:
1048: quit_pending = 1;
1049: return -1;
1050:
1051: case 'Z' - 64:
1052: /* Suspend the program. */
1053: /* Print a message to that effect to the user. */
1.32 markus 1054: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1055: buffer_append(berr, string, strlen(string));
1.31 markus 1056:
1057: /* Restore terminal modes and suspend. */
1058: client_suspend_self(bin, bout, berr);
1059:
1060: /* We have been continued. */
1061: continue;
1062:
1.111 markus 1063: case 'B':
1064: if (compat20) {
1065: snprintf(string, sizeof string,
1066: "%cB\r\n", escape_char);
1067: buffer_append(berr, string,
1068: strlen(string));
1069: channel_request_start(session_ident,
1070: "break", 0);
1071: packet_put_int(1000);
1072: packet_send();
1073: }
1074: continue;
1075:
1.54 markus 1076: case 'R':
1.59 markus 1077: if (compat20) {
1078: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1079: logit("Server does not support re-keying");
1.59 markus 1080: else
1081: need_rekeying = 1;
1082: }
1.54 markus 1083: continue;
1084:
1.31 markus 1085: case '&':
1086: /*
1087: * Detach the program (continue to serve connections,
1088: * but put in background and no more new connections).
1089: */
1090: /* Restore tty modes. */
1091: leave_raw_mode();
1092:
1093: /* Stop listening for new connections. */
1.86 markus 1094: channel_stop_listening();
1.31 markus 1095:
1.86 markus 1096: snprintf(string, sizeof string,
1097: "%c& [backgrounded]\n", escape_char);
1098: buffer_append(berr, string, strlen(string));
1.31 markus 1099:
1100: /* Fork into background. */
1101: pid = fork();
1102: if (pid < 0) {
1103: error("fork: %.100s", strerror(errno));
1104: continue;
1105: }
1106: if (pid != 0) { /* This is the parent. */
1107: /* The parent just exits. */
1108: exit(0);
1109: }
1110: /* The child continues serving connections. */
1.86 markus 1111: if (compat20) {
1112: buffer_append(bin, "\004", 1);
1113: /* fake EOF on stdin */
1114: return -1;
1115: } else if (!stdin_eof) {
1116: /*
1117: * Sending SSH_CMSG_EOF alone does not always appear
1118: * to be enough. So we try to send an EOF character
1119: * first.
1120: */
1121: packet_start(SSH_CMSG_STDIN_DATA);
1122: packet_put_string("\004", 1);
1123: packet_send();
1124: /* Close stdin. */
1125: stdin_eof = 1;
1126: if (buffer_len(bin) == 0) {
1127: packet_start(SSH_CMSG_EOF);
1128: packet_send();
1129: }
1130: }
1131: continue;
1.31 markus 1132:
1133: case '?':
1.32 markus 1134: snprintf(string, sizeof string,
1.31 markus 1135: "%c?\r\n\
1136: Supported escape sequences:\r\n\
1.104 stevesk 1137: %c. - terminate connection\r\n\
1.111 markus 1138: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1139: %cC - open a command line\r\n\
1140: %cR - Request rekey (SSH protocol 2 only)\r\n\
1141: %c^Z - suspend ssh\r\n\
1142: %c# - list forwarded connections\r\n\
1143: %c& - background ssh (when waiting for connections to terminate)\r\n\
1144: %c? - this message\r\n\
1145: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1146: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1147: escape_char, escape_char, escape_char, escape_char,
1148: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1149: escape_char, escape_char, escape_char);
1.32 markus 1150: buffer_append(berr, string, strlen(string));
1.31 markus 1151: continue;
1152:
1153: case '#':
1.32 markus 1154: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1155: buffer_append(berr, string, strlen(string));
1.31 markus 1156: s = channel_open_message();
1157: buffer_append(berr, s, strlen(s));
1158: xfree(s);
1.97 jakob 1159: continue;
1160:
1161: case 'C':
1.99 markus 1162: process_cmdline();
1.31 markus 1163: continue;
1164:
1165: default:
1166: if (ch != escape_char) {
1167: buffer_put_char(bin, escape_char);
1168: bytes++;
1169: }
1170: /* Escaped characters fall through here */
1171: break;
1172: }
1173: } else {
1174: /*
1175: * The previous character was not an escape char. Check if this
1176: * is an escape.
1177: */
1178: if (last_was_cr && ch == escape_char) {
1179: /* It is. Set the flag and continue to next character. */
1180: escape_pending = 1;
1181: continue;
1182: }
1183: }
1184:
1185: /*
1186: * Normal character. Record whether it was a newline,
1187: * and append it to the buffer.
1188: */
1189: last_was_cr = (ch == '\r' || ch == '\n');
1190: buffer_put_char(bin, ch);
1191: bytes++;
1192: }
1193: return bytes;
1194: }
1195:
1.77 itojun 1196: static void
1.161 deraadt 1197: client_process_input(fd_set *readset)
1.17 markus 1198: {
1.21 deraadt 1199: int len;
1.31 markus 1200: char buf[8192];
1.16 markus 1201:
1.11 markus 1202: /* Read input from stdin. */
1203: if (FD_ISSET(fileno(stdin), readset)) {
1204: /* Read as much as possible. */
1205: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1206: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1207: return; /* we'll try again later */
1.11 markus 1208: if (len <= 0) {
1.13 markus 1209: /*
1210: * Received EOF or error. They are treated
1211: * similarly, except that an error message is printed
1212: * if it was an error condition.
1213: */
1.11 markus 1214: if (len < 0) {
1215: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1216: buffer_append(&stderr_buffer, buf, strlen(buf));
1217: }
1218: /* Mark that we have seen EOF. */
1219: stdin_eof = 1;
1.13 markus 1220: /*
1221: * Send an EOF message to the server unless there is
1222: * data in the buffer. If there is data in the
1223: * buffer, no message will be sent now. Code
1224: * elsewhere will send the EOF when the buffer
1225: * becomes empty if stdin_eof is set.
1226: */
1.11 markus 1227: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1228: packet_start(SSH_CMSG_EOF);
1229: packet_send();
1.11 markus 1230: }
1.72 stevesk 1231: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1232: /*
1233: * Normal successful read, and no escape character.
1234: * Just append the data to buffer.
1235: */
1.11 markus 1236: buffer_append(&stdin_buffer, buf, len);
1237: } else {
1.13 markus 1238: /*
1239: * Normal, successful read. But we have an escape character
1240: * and have to process the characters one by one.
1241: */
1.52 markus 1242: if (process_escapes(&stdin_buffer, &stdout_buffer,
1243: &stderr_buffer, buf, len) == -1)
1.31 markus 1244: return;
1.11 markus 1245: }
1246: }
1247: }
1248:
1.77 itojun 1249: static void
1.161 deraadt 1250: client_process_output(fd_set *writeset)
1.11 markus 1251: {
1252: int len;
1253: char buf[100];
1.1 deraadt 1254:
1.11 markus 1255: /* Write buffered output to stdout. */
1256: if (FD_ISSET(fileno(stdout), writeset)) {
1257: /* Write as much data as possible. */
1258: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1259: buffer_len(&stdout_buffer));
1.11 markus 1260: if (len <= 0) {
1.64 markus 1261: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1262: len = 0;
1263: else {
1.13 markus 1264: /*
1265: * An error or EOF was encountered. Put an
1266: * error message to stderr buffer.
1267: */
1.11 markus 1268: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1269: buffer_append(&stderr_buffer, buf, strlen(buf));
1270: quit_pending = 1;
1271: return;
1272: }
1273: }
1274: /* Consume printed data from the buffer. */
1275: buffer_consume(&stdout_buffer, len);
1.57 markus 1276: stdout_bytes += len;
1.11 markus 1277: }
1278: /* Write buffered output to stderr. */
1279: if (FD_ISSET(fileno(stderr), writeset)) {
1280: /* Write as much data as possible. */
1281: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1282: buffer_len(&stderr_buffer));
1.11 markus 1283: if (len <= 0) {
1.64 markus 1284: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1285: len = 0;
1286: else {
1.13 markus 1287: /* EOF or error, but can't even print error message. */
1.11 markus 1288: quit_pending = 1;
1289: return;
1290: }
1291: }
1292: /* Consume printed characters from the buffer. */
1293: buffer_consume(&stderr_buffer, len);
1.57 markus 1294: stderr_bytes += len;
1.11 markus 1295: }
1.1 deraadt 1296: }
1297:
1.13 markus 1298: /*
1.15 markus 1299: * Get packets from the connection input buffer, and process them as long as
1300: * there are packets available.
1301: *
1302: * Any unknown packets received during the actual
1303: * session cause the session to terminate. This is
1304: * intended to make debugging easier since no
1305: * confirmations are sent. Any compatible protocol
1306: * extensions must be negotiated during the
1307: * preparatory phase.
1308: */
1309:
1.77 itojun 1310: static void
1.49 itojun 1311: client_process_buffered_input_packets(void)
1.15 markus 1312: {
1.54 markus 1313: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1314: }
1315:
1.31 markus 1316: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1317:
1.77 itojun 1318: static int
1.31 markus 1319: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1320: {
1.31 markus 1321: /* XXX we assume c->extended is writeable */
1322: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1323: }
1324:
1.77 itojun 1325: static void
1.60 markus 1326: client_channel_closed(int id, void *arg)
1327: {
1.83 markus 1328: channel_cancel_cleanup(id);
1.60 markus 1329: session_closed = 1;
1.113 markus 1330: leave_raw_mode();
1.60 markus 1331: }
1332:
1.15 markus 1333: /*
1.13 markus 1334: * Implements the interactive session with the server. This is called after
1335: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1336: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1337: * used as an escape character for terminating or suspending the session.
1.13 markus 1338: */
1.1 deraadt 1339:
1.20 markus 1340: int
1.30 markus 1341: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1342: {
1.46 markus 1343: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1344: double start_time, total_time;
1.130 avsm 1345: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1346: u_int nalloc = 0;
1.11 markus 1347: char buf[100];
1348:
1349: debug("Entering interactive session.");
1350:
1351: start_time = get_current_time();
1352:
1353: /* Initialize variables. */
1354: escape_pending = 0;
1355: last_was_cr = 1;
1356: exit_status = -1;
1357: stdin_eof = 0;
1358: buffer_high = 64 * 1024;
1359: connection_in = packet_get_connection_in();
1360: connection_out = packet_get_connection_out();
1.46 markus 1361: max_fd = MAX(connection_in, connection_out);
1.123 djm 1362: if (control_fd != -1)
1363: max_fd = MAX(max_fd, control_fd);
1.46 markus 1364:
1365: if (!compat20) {
1.63 markus 1366: /* enable nonblocking unless tty */
1367: if (!isatty(fileno(stdin)))
1368: set_nonblock(fileno(stdin));
1369: if (!isatty(fileno(stdout)))
1370: set_nonblock(fileno(stdout));
1371: if (!isatty(fileno(stderr)))
1372: set_nonblock(fileno(stderr));
1.46 markus 1373: max_fd = MAX(max_fd, fileno(stdin));
1374: max_fd = MAX(max_fd, fileno(stdout));
1375: max_fd = MAX(max_fd, fileno(stderr));
1376: }
1.11 markus 1377: stdin_bytes = 0;
1378: stdout_bytes = 0;
1379: stderr_bytes = 0;
1380: quit_pending = 0;
1381: escape_char = escape_char_arg;
1382:
1383: /* Initialize buffers. */
1384: buffer_init(&stdin_buffer);
1385: buffer_init(&stdout_buffer);
1386: buffer_init(&stderr_buffer);
1387:
1.15 markus 1388: client_init_dispatch();
1389:
1.105 markus 1390: /*
1391: * Set signal handlers, (e.g. to restore non-blocking mode)
1392: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1393: */
1.131 djm 1394: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1395: signal(SIGHUP, signal_handler);
1.105 markus 1396: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1397: signal(SIGINT, signal_handler);
1398: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1399: signal(SIGQUIT, signal_handler);
1400: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1401: signal(SIGTERM, signal_handler);
1.132 djm 1402: signal(SIGWINCH, window_change_handler);
1.11 markus 1403:
1404: if (have_pty)
1405: enter_raw_mode();
1406:
1.48 markus 1407: if (compat20) {
1408: session_ident = ssh2_chan_id;
1.72 stevesk 1409: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1410: channel_register_filter(session_ident,
1.149 reyk 1411: simple_escape_filter, NULL);
1.60 markus 1412: if (session_ident != -1)
1413: channel_register_cleanup(session_ident,
1.143 djm 1414: client_channel_closed, 0);
1.48 markus 1415: } else {
1416: /* Check if we should immediately send eof on stdin. */
1.16 markus 1417: client_check_initial_eof_on_stdin();
1.48 markus 1418: }
1.30 markus 1419:
1.11 markus 1420: /* Main loop of the client for the interactive session mode. */
1421: while (!quit_pending) {
1422:
1.13 markus 1423: /* Process buffered packets sent by the server. */
1.11 markus 1424: client_process_buffered_input_packets();
1425:
1.60 markus 1426: if (compat20 && session_closed && !channel_still_open())
1427: break;
1428:
1.56 markus 1429: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1430:
1.56 markus 1431: if (rekeying) {
1432: debug("rekeying in progress");
1433: } else {
1434: /*
1435: * Make packets of buffered stdin data, and buffer
1436: * them for sending to the server.
1437: */
1438: if (!compat20)
1439: client_make_packets_from_stdin_data();
1.11 markus 1440:
1.56 markus 1441: /*
1442: * Make packets from buffered channel data, and
1443: * enqueue them for sending to the server.
1444: */
1445: if (packet_not_very_much_data_to_write())
1446: channel_output_poll();
1.11 markus 1447:
1.56 markus 1448: /*
1449: * Check if the window size has changed, and buffer a
1450: * message about it to the server if so.
1451: */
1452: client_check_window_change();
1.11 markus 1453:
1.56 markus 1454: if (quit_pending)
1455: break;
1456: }
1.13 markus 1457: /*
1458: * Wait until we have something to do (something becomes
1459: * available on one of the descriptors).
1460: */
1.81 markus 1461: max_fd2 = max_fd;
1.56 markus 1462: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1463: &max_fd2, &nalloc, rekeying);
1.11 markus 1464:
1465: if (quit_pending)
1466: break;
1467:
1.56 markus 1468: /* Do channel operations unless rekeying in progress. */
1469: if (!rekeying) {
1470: channel_after_select(readset, writeset);
1.108 markus 1471: if (need_rekeying || packet_need_rekeying()) {
1472: debug("need rekeying");
1.56 markus 1473: xxx_kex->done = 0;
1474: kex_send_kexinit(xxx_kex);
1475: need_rekeying = 0;
1476: }
1477: }
1.11 markus 1478:
1.17 markus 1479: /* Buffer input from the connection. */
1.46 markus 1480: client_process_net_input(readset);
1.17 markus 1481:
1.123 djm 1482: /* Accept control connections. */
1483: client_process_control(readset);
1484:
1.17 markus 1485: if (quit_pending)
1486: break;
1.11 markus 1487:
1.17 markus 1488: if (!compat20) {
1489: /* Buffer data from stdin */
1.46 markus 1490: client_process_input(readset);
1.17 markus 1491: /*
1492: * Process output to stdout and stderr. Output to
1493: * the connection is processed elsewhere (above).
1494: */
1.46 markus 1495: client_process_output(writeset);
1.17 markus 1496: }
1.11 markus 1497:
1.13 markus 1498: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1499: if (FD_ISSET(connection_out, writeset))
1.11 markus 1500: packet_write_poll();
1501: }
1.46 markus 1502: if (readset)
1503: xfree(readset);
1504: if (writeset)
1505: xfree(writeset);
1.11 markus 1506:
1507: /* Terminate the session. */
1508:
1509: /* Stop watching for window change. */
1.132 djm 1510: signal(SIGWINCH, SIG_DFL);
1.11 markus 1511:
1.76 markus 1512: channel_free_all();
1.11 markus 1513:
1.75 markus 1514: if (have_pty)
1515: leave_raw_mode();
1516:
1517: /* restore blocking io */
1518: if (!isatty(fileno(stdin)))
1519: unset_nonblock(fileno(stdin));
1520: if (!isatty(fileno(stdout)))
1521: unset_nonblock(fileno(stdout));
1522: if (!isatty(fileno(stderr)))
1523: unset_nonblock(fileno(stderr));
1.116 dtucker 1524:
1525: /*
1526: * If there was no shell or command requested, there will be no remote
1527: * exit status to be returned. In that case, clear error code if the
1528: * connection was deliberately terminated at this end.
1529: */
1530: if (no_shell_flag && received_signal == SIGTERM) {
1531: received_signal = 0;
1532: exit_status = 0;
1533: }
1.75 markus 1534:
1.113 markus 1535: if (received_signal)
1.89 itojun 1536: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1537:
1.13 markus 1538: /*
1539: * In interactive mode (with pseudo tty) display a message indicating
1540: * that the connection has been closed.
1541: */
1.11 markus 1542: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1543: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1544: buffer_append(&stderr_buffer, buf, strlen(buf));
1545: }
1.70 markus 1546:
1.11 markus 1547: /* Output any buffered data for stdout. */
1.70 markus 1548: while (buffer_len(&stdout_buffer) > 0) {
1549: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1550: buffer_len(&stdout_buffer));
1.70 markus 1551: if (len <= 0) {
1.11 markus 1552: error("Write failed flushing stdout buffer.");
1.70 markus 1553: break;
1554: }
1.11 markus 1555: buffer_consume(&stdout_buffer, len);
1.57 markus 1556: stdout_bytes += len;
1.11 markus 1557: }
1558:
1559: /* Output any buffered data for stderr. */
1.70 markus 1560: while (buffer_len(&stderr_buffer) > 0) {
1561: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1562: buffer_len(&stderr_buffer));
1.70 markus 1563: if (len <= 0) {
1.11 markus 1564: error("Write failed flushing stderr buffer.");
1.70 markus 1565: break;
1566: }
1.11 markus 1567: buffer_consume(&stderr_buffer, len);
1.57 markus 1568: stderr_bytes += len;
1.11 markus 1569: }
1570:
1571: /* Clear and free any buffers. */
1572: memset(buf, 0, sizeof(buf));
1573: buffer_free(&stdin_buffer);
1574: buffer_free(&stdout_buffer);
1575: buffer_free(&stderr_buffer);
1576:
1577: /* Report bytes transferred, and transfer rates. */
1578: total_time = get_current_time() - start_time;
1579: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1580: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1581: if (total_time > 0)
1582: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1583: stdin_bytes / total_time, stdout_bytes / total_time,
1584: stderr_bytes / total_time);
1.11 markus 1585:
1586: /* Return the exit status of the program. */
1587: debug("Exit status %d", exit_status);
1588: return exit_status;
1.15 markus 1589: }
1590:
1591: /*********/
1592:
1.77 itojun 1593: static void
1.94 markus 1594: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1595: {
1.42 markus 1596: u_int data_len;
1.15 markus 1597: char *data = packet_get_string(&data_len);
1.93 markus 1598: packet_check_eom();
1.15 markus 1599: buffer_append(&stdout_buffer, data, data_len);
1600: memset(data, 0, data_len);
1601: xfree(data);
1602: }
1.77 itojun 1603: static void
1.94 markus 1604: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1605: {
1.42 markus 1606: u_int data_len;
1.15 markus 1607: char *data = packet_get_string(&data_len);
1.93 markus 1608: packet_check_eom();
1.15 markus 1609: buffer_append(&stderr_buffer, data, data_len);
1610: memset(data, 0, data_len);
1611: xfree(data);
1612: }
1.77 itojun 1613: static void
1.94 markus 1614: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1615: {
1616: exit_status = packet_get_int();
1.93 markus 1617: packet_check_eom();
1.15 markus 1618: /* Acknowledge the exit. */
1619: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1620: packet_send();
1621: /*
1622: * Must wait for packet to be sent since we are
1623: * exiting the loop.
1624: */
1625: packet_write_wait();
1626: /* Flag that we want to exit. */
1627: quit_pending = 1;
1628: }
1.115 markus 1629: static void
1630: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1631: {
1632: Channel *c = NULL;
1633: int remote_id, sock;
1634:
1635: /* Read the remote channel number from the message. */
1636: remote_id = packet_get_int();
1637: packet_check_eom();
1638:
1639: /*
1640: * Get a connection to the local authentication agent (this may again
1641: * get forwarded).
1642: */
1643: sock = ssh_get_authentication_socket();
1644:
1645: /*
1646: * If we could not connect the agent, send an error message back to
1647: * the server. This should never happen unless the agent dies,
1648: * because authentication forwarding is only enabled if we have an
1649: * agent.
1650: */
1651: if (sock >= 0) {
1652: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1653: -1, 0, 0, 0, "authentication agent connection", 1);
1654: c->remote_id = remote_id;
1655: c->force_drain = 1;
1656: }
1657: if (c == NULL) {
1658: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1659: packet_put_int(remote_id);
1660: } else {
1661: /* Send a confirmation to the remote host. */
1662: debug("Forwarding authentication connection.");
1663: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1664: packet_put_int(remote_id);
1665: packet_put_int(c->self);
1666: }
1667: packet_send();
1668: }
1.15 markus 1669:
1.77 itojun 1670: static Channel *
1.40 markus 1671: client_request_forwarded_tcpip(const char *request_type, int rchan)
1672: {
1.103 deraadt 1673: Channel *c = NULL;
1.40 markus 1674: char *listen_address, *originator_address;
1675: int listen_port, originator_port;
1.67 markus 1676: int sock;
1.40 markus 1677:
1678: /* Get rest of the packet */
1679: listen_address = packet_get_string(NULL);
1680: listen_port = packet_get_int();
1681: originator_address = packet_get_string(NULL);
1682: originator_port = packet_get_int();
1.93 markus 1683: packet_check_eom();
1.40 markus 1684:
1685: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1686: listen_address, listen_port, originator_address, originator_port);
1687:
1.80 stevesk 1688: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1689: if (sock < 0) {
1690: xfree(originator_address);
1691: xfree(listen_address);
1692: return NULL;
1693: }
1694: c = channel_new("forwarded-tcpip",
1695: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1696: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1697: originator_address, 1);
1.40 markus 1698: xfree(originator_address);
1699: xfree(listen_address);
1700: return c;
1701: }
1702:
1.103 deraadt 1703: static Channel *
1.40 markus 1704: client_request_x11(const char *request_type, int rchan)
1705: {
1706: Channel *c = NULL;
1707: char *originator;
1708: int originator_port;
1.67 markus 1709: int sock;
1.40 markus 1710:
1711: if (!options.forward_x11) {
1712: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1713: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1714: return NULL;
1715: }
1716: originator = packet_get_string(NULL);
1717: if (datafellows & SSH_BUG_X11FWD) {
1718: debug2("buggy server: x11 request w/o originator_port");
1719: originator_port = 0;
1720: } else {
1721: originator_port = packet_get_int();
1722: }
1.93 markus 1723: packet_check_eom();
1.40 markus 1724: /* XXX check permission */
1.47 markus 1725: debug("client_request_x11: request from %s %d", originator,
1726: originator_port);
1.67 markus 1727: xfree(originator);
1.40 markus 1728: sock = x11_connect_display();
1.67 markus 1729: if (sock < 0)
1730: return NULL;
1731: c = channel_new("x11",
1732: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1733: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1734: c->force_drain = 1;
1.40 markus 1735: return c;
1736: }
1737:
1.103 deraadt 1738: static Channel *
1.40 markus 1739: client_request_agent(const char *request_type, int rchan)
1740: {
1741: Channel *c = NULL;
1.67 markus 1742: int sock;
1.40 markus 1743:
1744: if (!options.forward_agent) {
1745: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1746: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1747: return NULL;
1748: }
1749: sock = ssh_get_authentication_socket();
1.67 markus 1750: if (sock < 0)
1751: return NULL;
1752: c = channel_new("authentication agent connection",
1753: SSH_CHANNEL_OPEN, sock, sock, -1,
1754: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1755: "authentication agent connection", 1);
1.82 markus 1756: c->force_drain = 1;
1.40 markus 1757: return c;
1758: }
1759:
1.22 markus 1760: /* XXXX move to generic input handler */
1.77 itojun 1761: static void
1.94 markus 1762: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1763: {
1764: Channel *c = NULL;
1765: char *ctype;
1766: int rchan;
1.102 markus 1767: u_int rmaxpack, rwindow, len;
1.22 markus 1768:
1769: ctype = packet_get_string(&len);
1770: rchan = packet_get_int();
1771: rwindow = packet_get_int();
1772: rmaxpack = packet_get_int();
1773:
1.24 markus 1774: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1775: ctype, rchan, rwindow, rmaxpack);
1776:
1.40 markus 1777: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1778: c = client_request_forwarded_tcpip(ctype, rchan);
1779: } else if (strcmp(ctype, "x11") == 0) {
1780: c = client_request_x11(ctype, rchan);
1781: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1782: c = client_request_agent(ctype, rchan);
1.22 markus 1783: }
1784: /* XXX duplicate : */
1785: if (c != NULL) {
1786: debug("confirm %s", ctype);
1787: c->remote_id = rchan;
1788: c->remote_window = rwindow;
1789: c->remote_maxpacket = rmaxpack;
1.69 markus 1790: if (c->type != SSH_CHANNEL_CONNECTING) {
1791: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1792: packet_put_int(c->remote_id);
1793: packet_put_int(c->self);
1794: packet_put_int(c->local_window);
1795: packet_put_int(c->local_maxpacket);
1796: packet_send();
1797: }
1.22 markus 1798: } else {
1799: debug("failure %s", ctype);
1800: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1801: packet_put_int(rchan);
1802: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1803: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1804: packet_put_cstring("open failed");
1.66 markus 1805: packet_put_cstring("");
1806: }
1.22 markus 1807: packet_send();
1808: }
1809: xfree(ctype);
1810: }
1.77 itojun 1811: static void
1.94 markus 1812: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1813: {
1814: Channel *c = NULL;
1.123 djm 1815: int exitval, id, reply, success = 0;
1.48 markus 1816: char *rtype;
1817:
1818: id = packet_get_int();
1819: rtype = packet_get_string(NULL);
1820: reply = packet_get_char();
1821:
1822: debug("client_input_channel_req: channel %d rtype %s reply %d",
1823: id, rtype, reply);
1824:
1.128 djm 1825: if (id == -1) {
1826: error("client_input_channel_req: request for channel -1");
1827: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1828: error("client_input_channel_req: channel %d: unknown channel", id);
1829: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1830: exitval = packet_get_int();
1831: if (id == session_ident) {
1832: success = 1;
1833: exit_status = exitval;
1834: } else if (c->ctl_fd == -1) {
1835: error("client_input_channel_req: unexpected channel %d",
1836: session_ident);
1837: } else {
1838: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1839: success = 1;
1840: }
1.93 markus 1841: packet_check_eom();
1.48 markus 1842: }
1843: if (reply) {
1844: packet_start(success ?
1845: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1846: packet_put_int(id);
1.48 markus 1847: packet_send();
1848: }
1849: xfree(rtype);
1850: }
1.95 markus 1851: static void
1852: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1853: {
1854: char *rtype;
1855: int want_reply;
1856: int success = 0;
1857:
1858: rtype = packet_get_string(NULL);
1859: want_reply = packet_get_char();
1.117 markus 1860: debug("client_input_global_request: rtype %s want_reply %d",
1861: rtype, want_reply);
1.95 markus 1862: if (want_reply) {
1863: packet_start(success ?
1864: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1865: packet_send();
1866: packet_write_wait();
1867: }
1868: xfree(rtype);
1869: }
1.22 markus 1870:
1.123 djm 1871: void
1.129 deraadt 1872: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1873: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1874: dispatch_fn *subsys_repl)
1875: {
1876: int len;
1.132 djm 1877: Channel *c = NULL;
1.123 djm 1878:
1879: debug2("%s: id %d", __func__, id);
1880:
1.132 djm 1881: if ((c = channel_lookup(id)) == NULL)
1882: fatal("client_session2_setup: channel %d: unknown channel", id);
1883:
1.123 djm 1884: if (want_tty) {
1885: struct winsize ws;
1886: struct termios tio;
1887:
1888: /* Store window size in the packet. */
1889: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1890: memset(&ws, 0, sizeof(ws));
1891:
1892: channel_request_start(id, "pty-req", 0);
1893: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1894: packet_put_int((u_int)ws.ws_col);
1895: packet_put_int((u_int)ws.ws_row);
1896: packet_put_int((u_int)ws.ws_xpixel);
1897: packet_put_int((u_int)ws.ws_ypixel);
1.123 djm 1898: tio = get_saved_tio();
1899: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1900: packet_send();
1901: /* XXX wait for reply */
1.132 djm 1902: c->client_tty = 1;
1.123 djm 1903: }
1904:
1905: /* Transfer any environment variables from client to server */
1.126 djm 1906: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1907: int i, j, matched;
1908: char *name, *val;
1909:
1910: debug("Sending environment.");
1.126 djm 1911: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1912: /* Split */
1.126 djm 1913: name = xstrdup(env[i]);
1.123 djm 1914: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1915: xfree(name);
1.123 djm 1916: continue;
1917: }
1918: *val++ = '\0';
1919:
1920: matched = 0;
1921: for (j = 0; j < options.num_send_env; j++) {
1922: if (match_pattern(name, options.send_env[j])) {
1923: matched = 1;
1924: break;
1925: }
1926: }
1927: if (!matched) {
1928: debug3("Ignored env %s", name);
1.144 stevesk 1929: xfree(name);
1.123 djm 1930: continue;
1931: }
1932:
1933: debug("Sending env %s = %s", name, val);
1934: channel_request_start(id, "env", 0);
1935: packet_put_cstring(name);
1936: packet_put_cstring(val);
1937: packet_send();
1.144 stevesk 1938: xfree(name);
1.123 djm 1939: }
1940: }
1941:
1942: len = buffer_len(cmd);
1943: if (len > 0) {
1944: if (len > 900)
1945: len = 900;
1946: if (want_subsystem) {
1947: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1948: channel_request_start(id, "subsystem", subsys_repl != NULL);
1949: if (subsys_repl != NULL) {
1950: /* register callback for reply */
1951: /* XXX we assume that client_loop has already been called */
1952: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1953: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1954: }
1955: } else {
1956: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1957: channel_request_start(id, "exec", 0);
1958: }
1959: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1960: packet_send();
1961: } else {
1962: channel_request_start(id, "shell", 0);
1963: packet_send();
1964: }
1965: }
1966:
1.77 itojun 1967: static void
1.49 itojun 1968: client_init_dispatch_20(void)
1.16 markus 1969: {
1.55 markus 1970: dispatch_init(&dispatch_protocol_error);
1.100 markus 1971:
1.16 markus 1972: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1973: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1974: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1975: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1976: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1977: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1978: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1979: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1980: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1981: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1982:
1983: /* rekeying */
1984: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1985:
1986: /* global request reply messages */
1987: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1988: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1989: }
1.77 itojun 1990: static void
1.49 itojun 1991: client_init_dispatch_13(void)
1.15 markus 1992: {
1993: dispatch_init(NULL);
1994: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1995: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1996: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1997: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1998: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1999: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2000: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2001: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2002: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2003:
2004: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2005: &client_input_agent_open : &deny_input_open);
1.39 markus 2006: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2007: &x11_input_open : &deny_input_open);
1.15 markus 2008: }
1.77 itojun 2009: static void
1.49 itojun 2010: client_init_dispatch_15(void)
1.15 markus 2011: {
2012: client_init_dispatch_13();
2013: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2014: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2015: }
1.79 stevesk 2016: static void
1.49 itojun 2017: client_init_dispatch(void)
1.15 markus 2018: {
1.16 markus 2019: if (compat20)
2020: client_init_dispatch_20();
2021: else if (compat13)
1.15 markus 2022: client_init_dispatch_13();
2023: else
2024: client_init_dispatch_15();
1.113 markus 2025: }
2026:
2027: /* client specific fatal cleanup */
2028: void
1.114 markus 2029: cleanup_exit(int i)
1.113 markus 2030: {
2031: leave_raw_mode();
2032: leave_non_blocking();
1.123 djm 2033: if (options.control_path != NULL && control_fd != -1)
2034: unlink(options.control_path);
1.114 markus 2035: _exit(i);
1.1 deraadt 2036: }
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