Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.175.4.1
1.175.4.1! brad 1: /* $OpenBSD: clientloop.c,v 1.176 2006/10/11 12:38:03 markus 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:
1.152 stevesk 62:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.172 stevesk 68: #include <sys/param.h>
1.150 stevesk 69:
1.155 stevesk 70: #include <ctype.h>
1.168 stevesk 71: #include <errno.h>
1.151 stevesk 72: #include <paths.h>
1.153 stevesk 73: #include <signal.h>
1.174 stevesk 74: #include <stdio.h>
1.173 stevesk 75: #include <stdlib.h>
1.170 stevesk 76: #include <string.h>
1.150 stevesk 77: #include <termios.h>
1.175 deraadt 78: #include <pwd.h>
1.169 stevesk 79: #include <unistd.h>
1.1 deraadt 80:
1.175 deraadt 81: #include "xmalloc.h"
1.45 markus 82: #include "ssh.h"
83: #include "ssh1.h"
84: #include "ssh2.h"
1.1 deraadt 85: #include "packet.h"
86: #include "buffer.h"
1.15 markus 87: #include "compat.h"
1.74 markus 88: #include "channels.h"
1.15 markus 89: #include "dispatch.h"
1.40 markus 90: #include "key.h"
1.175 deraadt 91: #include "cipher.h"
1.54 markus 92: #include "kex.h"
1.45 markus 93: #include "log.h"
94: #include "readconf.h"
95: #include "clientloop.h"
1.147 djm 96: #include "sshconnect.h"
1.40 markus 97: #include "authfd.h"
1.45 markus 98: #include "atomicio.h"
1.118 deraadt 99: #include "sshpty.h"
1.63 markus 100: #include "misc.h"
1.123 djm 101: #include "monitor_fdpass.h"
102: #include "match.h"
103: #include "msg.h"
1.39 markus 104:
105: /* import options */
106: extern Options options;
107:
1.1 deraadt 108: /* Flag indicating that stdin should be redirected from /dev/null. */
109: extern int stdin_null_flag;
110:
1.116 dtucker 111: /* Flag indicating that no shell has been requested */
112: extern int no_shell_flag;
113:
1.123 djm 114: /* Control socket */
115: extern int control_fd;
116:
1.13 markus 117: /*
118: * Name of the host we are connecting to. This is the name given on the
119: * command line, or the HostName specified for the user-supplied name in a
120: * configuration file.
121: */
1.1 deraadt 122: extern char *host;
123:
1.13 markus 124: /*
125: * Flag to indicate that we have received a window change signal which has
126: * not yet been processed. This will cause a message indicating the new
127: * window size to be sent to the server a little later. This is volatile
128: * because this is updated in a signal handler.
129: */
1.88 markus 130: static volatile sig_atomic_t received_window_change_signal = 0;
131: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 132:
1.145 djm 133: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 134: static int in_non_blocking_mode = 0;
135:
136: /* Common data for the client loop code. */
1.162 djm 137: static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.31 markus 138: static int escape_char; /* Escape character. */
1.11 markus 139: static int escape_pending; /* Last character was the escape character */
140: static int last_was_cr; /* Last character was a newline. */
141: static int exit_status; /* Used to store the exit status of the command. */
142: static int stdin_eof; /* EOF has been encountered on standard error. */
143: static Buffer stdin_buffer; /* Buffer for stdin data. */
144: static Buffer stdout_buffer; /* Buffer for stdout data. */
145: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 146: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
147: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 148: static int connection_in; /* Connection to server (input). */
149: static int connection_out; /* Connection to server (output). */
1.56 markus 150: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 151: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 152: static int server_alive_timeouts = 0;
1.1 deraadt 153:
1.77 itojun 154: static void client_init_dispatch(void);
1.16 markus 155: int session_ident = -1;
156:
1.123 djm 157: struct confirm_ctx {
158: int want_tty;
159: int want_subsys;
1.140 djm 160: int want_x_fwd;
161: int want_agent_fwd;
1.123 djm 162: Buffer cmd;
163: char *term;
164: struct termios tio;
1.126 djm 165: char **env;
1.123 djm 166: };
167:
1.54 markus 168: /*XXX*/
169: extern Kex *xxx_kex;
170:
1.123 djm 171: void ssh_process_session2_setup(int, int, int, Buffer *);
172:
1.1 deraadt 173: /* Restores stdin to blocking mode. */
174:
1.77 itojun 175: static void
1.49 itojun 176: leave_non_blocking(void)
1.1 deraadt 177: {
1.11 markus 178: if (in_non_blocking_mode) {
1.125 djm 179: unset_nonblock(fileno(stdin));
1.11 markus 180: in_non_blocking_mode = 0;
181: }
1.1 deraadt 182: }
183:
1.11 markus 184: /* Puts stdin terminal in non-blocking mode. */
185:
1.77 itojun 186: static void
1.49 itojun 187: enter_non_blocking(void)
1.1 deraadt 188: {
1.11 markus 189: in_non_blocking_mode = 1;
1.124 djm 190: set_nonblock(fileno(stdin));
1.1 deraadt 191: }
192:
1.13 markus 193: /*
194: * Signal handler for the window change signal (SIGWINCH). This just sets a
195: * flag indicating that the window has changed.
196: */
1.157 deraadt 197: /*ARGSUSED */
1.77 itojun 198: static void
1.11 markus 199: window_change_handler(int sig)
1.1 deraadt 200: {
1.11 markus 201: received_window_change_signal = 1;
202: signal(SIGWINCH, window_change_handler);
1.1 deraadt 203: }
204:
1.13 markus 205: /*
206: * Signal handler for signals that cause the program to terminate. These
207: * signals must be trapped to restore terminal modes.
208: */
1.157 deraadt 209: /*ARGSUSED */
1.77 itojun 210: static void
1.11 markus 211: signal_handler(int sig)
1.1 deraadt 212: {
1.75 markus 213: received_signal = sig;
214: quit_pending = 1;
1.1 deraadt 215: }
216:
1.13 markus 217: /*
218: * Returns current time in seconds from Jan 1, 1970 with the maximum
219: * available resolution.
220: */
1.1 deraadt 221:
1.77 itojun 222: static double
1.49 itojun 223: get_current_time(void)
1.1 deraadt 224: {
1.11 markus 225: struct timeval tv;
226: gettimeofday(&tv, NULL);
227: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 228: }
229:
230: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
231: void
232: client_x11_get_proto(const char *display, const char *xauth_path,
233: u_int trusted, char **_proto, char **_data)
234: {
235: char cmd[1024];
236: char line[512];
237: char xdisplay[512];
238: static char proto[512], data[512];
239: FILE *f;
240: int got_data = 0, generated = 0, do_unlink = 0, i;
241: char *xauthdir, *xauthfile;
242: struct stat st;
243:
244: xauthdir = xauthfile = NULL;
245: *_proto = proto;
246: *_data = data;
247: proto[0] = data[0] = '\0';
248:
249: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
250: debug("No xauth program.");
251: } else {
252: if (display == NULL) {
253: debug("x11_get_proto: DISPLAY not set");
254: return;
255: }
256: /*
257: * Handle FamilyLocal case where $DISPLAY does
258: * not match an authorization entry. For this we
259: * just try "xauth list unix:displaynum.screennum".
260: * XXX: "localhost" match to determine FamilyLocal
261: * is not perfect.
262: */
263: if (strncmp(display, "localhost:", 10) == 0) {
264: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
265: display + 10);
266: display = xdisplay;
267: }
268: if (trusted == 0) {
269: xauthdir = xmalloc(MAXPATHLEN);
270: xauthfile = xmalloc(MAXPATHLEN);
271: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
272: if (mkdtemp(xauthdir) != NULL) {
273: do_unlink = 1;
274: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
275: xauthdir);
276: snprintf(cmd, sizeof(cmd),
277: "%s -f %s generate %s " SSH_X11_PROTO
278: " untrusted timeout 1200 2>" _PATH_DEVNULL,
279: xauth_path, xauthfile, display);
280: debug2("x11_get_proto: %s", cmd);
281: if (system(cmd) == 0)
282: generated = 1;
283: }
284: }
285: snprintf(cmd, sizeof(cmd),
1.142 markus 286: "%s %s%s list %s 2>" _PATH_DEVNULL,
1.138 djm 287: xauth_path,
288: generated ? "-f " : "" ,
289: generated ? xauthfile : "",
290: display);
291: debug2("x11_get_proto: %s", cmd);
292: f = popen(cmd, "r");
293: if (f && fgets(line, sizeof(line), f) &&
294: sscanf(line, "%*s %511s %511s", proto, data) == 2)
295: got_data = 1;
296: if (f)
297: pclose(f);
298: }
299:
300: if (do_unlink) {
301: unlink(xauthfile);
302: rmdir(xauthdir);
303: }
304: if (xauthdir)
305: xfree(xauthdir);
306: if (xauthfile)
307: xfree(xauthfile);
308:
309: /*
310: * If we didn't get authentication data, just make up some
311: * data. The forwarding code will check the validity of the
312: * response anyway, and substitute this data. The X11
313: * server, however, will ignore this fake data and use
314: * whatever authentication mechanisms it was using otherwise
315: * for the local connection.
316: */
317: if (!got_data) {
318: u_int32_t rnd = 0;
319:
320: logit("Warning: No xauth data; "
321: "using fake authentication data for X11 forwarding.");
322: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
323: for (i = 0; i < 16; i++) {
324: if (i % 4 == 0)
325: rnd = arc4random();
326: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
327: rnd & 0xff);
328: rnd >>= 8;
329: }
330: }
1.1 deraadt 331: }
332:
1.13 markus 333: /*
334: * This is called when the interactive is entered. This checks if there is
335: * an EOF coming on stdin. We must check this explicitly, as select() does
336: * not appear to wake up when redirecting from /dev/null.
337: */
1.1 deraadt 338:
1.77 itojun 339: static void
1.49 itojun 340: client_check_initial_eof_on_stdin(void)
1.1 deraadt 341: {
1.11 markus 342: int len;
343: char buf[1];
1.1 deraadt 344:
1.13 markus 345: /*
346: * If standard input is to be "redirected from /dev/null", we simply
347: * mark that we have seen an EOF and send an EOF message to the
348: * server. Otherwise, we try to read a single character; it appears
349: * that for some files, such /dev/null, select() never wakes up for
350: * read for this descriptor, which means that we never get EOF. This
351: * way we will get the EOF if stdin comes from /dev/null or similar.
352: */
1.11 markus 353: if (stdin_null_flag) {
354: /* Fake EOF on stdin. */
355: debug("Sending eof.");
356: stdin_eof = 1;
357: packet_start(SSH_CMSG_EOF);
358: packet_send();
359: } else {
360: enter_non_blocking();
361:
362: /* Check for immediate EOF on stdin. */
363: len = read(fileno(stdin), buf, 1);
364: if (len == 0) {
1.13 markus 365: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 366: debug("Sending eof.");
367: stdin_eof = 1;
368: packet_start(SSH_CMSG_EOF);
369: packet_send();
370: } else if (len > 0) {
1.13 markus 371: /*
372: * Got data. We must store the data in the buffer,
373: * and also process it as an escape character if
374: * appropriate.
375: */
1.42 markus 376: if ((u_char) buf[0] == escape_char)
1.11 markus 377: escape_pending = 1;
1.52 markus 378: else
1.11 markus 379: buffer_append(&stdin_buffer, buf, 1);
380: }
381: leave_non_blocking();
382: }
1.1 deraadt 383: }
384:
385:
1.13 markus 386: /*
387: * Make packets from buffered stdin data, and buffer them for sending to the
388: * connection.
389: */
1.1 deraadt 390:
1.77 itojun 391: static void
1.49 itojun 392: client_make_packets_from_stdin_data(void)
1.1 deraadt 393: {
1.42 markus 394: u_int len;
1.1 deraadt 395:
1.11 markus 396: /* Send buffered stdin data to the server. */
397: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 398: packet_not_very_much_data_to_write()) {
1.11 markus 399: len = buffer_len(&stdin_buffer);
400: /* Keep the packets at reasonable size. */
401: if (len > packet_get_maxsize())
402: len = packet_get_maxsize();
403: packet_start(SSH_CMSG_STDIN_DATA);
404: packet_put_string(buffer_ptr(&stdin_buffer), len);
405: packet_send();
406: buffer_consume(&stdin_buffer, len);
1.52 markus 407: stdin_bytes += len;
1.11 markus 408: /* If we have a pending EOF, send it now. */
409: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
410: packet_start(SSH_CMSG_EOF);
411: packet_send();
412: }
1.1 deraadt 413: }
414: }
415:
1.13 markus 416: /*
417: * Checks if the client window has changed, and sends a packet about it to
418: * the server if so. The actual change is detected elsewhere (by a software
419: * interrupt on Unix); this just checks the flag and sends a message if
420: * appropriate.
421: */
1.1 deraadt 422:
1.77 itojun 423: static void
1.49 itojun 424: client_check_window_change(void)
1.1 deraadt 425: {
1.16 markus 426: struct winsize ws;
427:
428: if (! received_window_change_signal)
429: return;
430: /** XXX race */
431: received_window_change_signal = 0;
432:
1.37 markus 433: debug2("client_check_window_change: changed");
1.16 markus 434:
435: if (compat20) {
1.123 djm 436: channel_send_window_changes();
1.16 markus 437: } else {
1.123 djm 438: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
439: return;
1.16 markus 440: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 441: packet_put_int((u_int)ws.ws_row);
442: packet_put_int((u_int)ws.ws_col);
443: packet_put_int((u_int)ws.ws_xpixel);
444: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 445: packet_send();
1.1 deraadt 446: }
447: }
448:
1.117 markus 449: static void
450: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
451: {
452: server_alive_timeouts = 0;
453: client_global_request_reply_fwd(type, seq, ctxt);
454: }
455:
456: static void
457: server_alive_check(void)
458: {
1.175.4.1! brad 459: if (++server_alive_timeouts > options.server_alive_count_max) {
! 460: logit("Timeout, server not responding.");
! 461: cleanup_exit(255);
! 462: }
1.117 markus 463: packet_start(SSH2_MSG_GLOBAL_REQUEST);
464: packet_put_cstring("keepalive@openssh.com");
465: packet_put_char(1); /* boolean: want reply */
466: packet_send();
467: }
468:
1.13 markus 469: /*
470: * Waits until the client can do something (some data becomes available on
471: * one of the file descriptors).
472: */
1.77 itojun 473: static void
1.46 markus 474: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 475: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 476: {
1.117 markus 477: struct timeval tv, *tvp;
478: int ret;
479:
1.46 markus 480: /* Add any selections by the channel mechanism. */
1.81 markus 481: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 482:
1.16 markus 483: if (!compat20) {
1.17 markus 484: /* Read from the connection, unless our buffers are full. */
1.16 markus 485: if (buffer_len(&stdout_buffer) < buffer_high &&
486: buffer_len(&stderr_buffer) < buffer_high &&
487: channel_not_very_much_buffered_data())
1.46 markus 488: FD_SET(connection_in, *readsetp);
1.17 markus 489: /*
490: * Read from stdin, unless we have seen EOF or have very much
491: * buffered data to send to the server.
492: */
493: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 494: FD_SET(fileno(stdin), *readsetp);
1.17 markus 495:
496: /* Select stdout/stderr if have data in buffer. */
497: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 498: FD_SET(fileno(stdout), *writesetp);
1.17 markus 499: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 500: FD_SET(fileno(stderr), *writesetp);
1.16 markus 501: } else {
1.71 markus 502: /* channel_prepare_select could have closed the last channel */
1.84 markus 503: if (session_closed && !channel_still_open() &&
504: !packet_have_data_to_write()) {
505: /* clear mask since we did not call select() */
1.87 markus 506: memset(*readsetp, 0, *nallocp);
507: memset(*writesetp, 0, *nallocp);
1.84 markus 508: return;
1.71 markus 509: } else {
510: FD_SET(connection_in, *readsetp);
511: }
1.16 markus 512: }
1.11 markus 513:
514: /* Select server connection if have data to write to the server. */
515: if (packet_have_data_to_write())
1.46 markus 516: FD_SET(connection_out, *writesetp);
1.11 markus 517:
1.123 djm 518: if (control_fd != -1)
519: FD_SET(control_fd, *readsetp);
520:
1.13 markus 521: /*
522: * Wait for something to happen. This will suspend the process until
523: * some selected descriptor can be read, written, or has some other
1.117 markus 524: * event pending.
1.13 markus 525: */
1.11 markus 526:
1.117 markus 527: if (options.server_alive_interval == 0 || !compat20)
528: tvp = NULL;
1.129 deraadt 529: else {
1.117 markus 530: tv.tv_sec = options.server_alive_interval;
531: tv.tv_usec = 0;
532: tvp = &tv;
533: }
534: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
535: if (ret < 0) {
1.11 markus 536: char buf[100];
1.51 markus 537:
538: /*
539: * We have to clear the select masks, because we return.
540: * We have to return, because the mainloop checks for the flags
541: * set by the signal handlers.
542: */
1.87 markus 543: memset(*readsetp, 0, *nallocp);
544: memset(*writesetp, 0, *nallocp);
1.50 deraadt 545:
1.11 markus 546: if (errno == EINTR)
547: return;
548: /* Note: we might still have data in the buffers. */
549: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
550: buffer_append(&stderr_buffer, buf, strlen(buf));
551: quit_pending = 1;
1.117 markus 552: } else if (ret == 0)
553: server_alive_check();
1.11 markus 554: }
555:
1.77 itojun 556: static void
1.31 markus 557: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 558: {
1.11 markus 559: /* Flush stdout and stderr buffers. */
1.31 markus 560: if (buffer_len(bout) > 0)
1.112 deraadt 561: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 562: if (buffer_len(berr) > 0)
1.112 deraadt 563: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 564:
565: leave_raw_mode();
566:
1.13 markus 567: /*
568: * Free (and clear) the buffer to reduce the amount of data that gets
569: * written to swap.
570: */
1.31 markus 571: buffer_free(bin);
572: buffer_free(bout);
573: buffer_free(berr);
1.11 markus 574:
575: /* Send the suspend signal to the program itself. */
576: kill(getpid(), SIGTSTP);
577:
1.132 djm 578: /* Reset window sizes in case they have changed */
579: received_window_change_signal = 1;
1.11 markus 580:
581: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 582: buffer_init(bin);
583: buffer_init(bout);
584: buffer_init(berr);
1.11 markus 585:
586: enter_raw_mode();
587: }
588:
1.77 itojun 589: static void
1.161 deraadt 590: client_process_net_input(fd_set *readset)
1.11 markus 591: {
1.17 markus 592: int len;
593: char buf[8192];
1.11 markus 594:
1.13 markus 595: /*
596: * Read input from the server, and add any such data to the buffer of
597: * the packet subsystem.
598: */
1.11 markus 599: if (FD_ISSET(connection_in, readset)) {
600: /* Read as much as possible. */
601: len = read(connection_in, buf, sizeof(buf));
602: if (len == 0) {
603: /* Received EOF. The remote host has closed the connection. */
604: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
605: host);
1.1 deraadt 606: buffer_append(&stderr_buffer, buf, strlen(buf));
607: quit_pending = 1;
608: return;
1.11 markus 609: }
1.13 markus 610: /*
611: * There is a kernel bug on Solaris that causes select to
612: * sometimes wake up even though there is no data available.
613: */
1.53 millert 614: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 615: len = 0;
616:
617: if (len < 0) {
618: /* An error has encountered. Perhaps there is a network problem. */
619: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
620: host, strerror(errno));
621: buffer_append(&stderr_buffer, buf, strlen(buf));
622: quit_pending = 1;
623: return;
624: }
625: packet_process_incoming(buf, len);
626: }
1.17 markus 627: }
1.16 markus 628:
1.97 jakob 629: static void
1.123 djm 630: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
631: {
632: int id;
633: Channel *c;
1.129 deraadt 634:
1.123 djm 635: id = packet_get_int();
636: packet_check_eom();
637:
638: if ((c = channel_lookup(id)) == NULL) {
639: error("%s: no channel for id %d", __func__, id);
640: return;
641: }
642:
643: if (type == SSH2_MSG_CHANNEL_SUCCESS)
644: debug2("Request suceeded on channel %d", id);
645: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
646: error("Request failed on channel %d", id);
647: channel_free(c);
648: }
649: }
650:
651: static void
652: client_extra_session2_setup(int id, void *arg)
653: {
654: struct confirm_ctx *cctx = arg;
1.140 djm 655: const char *display;
1.123 djm 656: Channel *c;
1.126 djm 657: int i;
1.129 deraadt 658:
1.123 djm 659: if (cctx == NULL)
660: fatal("%s: cctx == NULL", __func__);
661: if ((c = channel_lookup(id)) == NULL)
662: fatal("%s: no channel for id %d", __func__, id);
663:
1.141 djm 664: display = getenv("DISPLAY");
1.140 djm 665: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
666: char *proto, *data;
667: /* Get reasonable local authentication information. */
668: client_x11_get_proto(display, options.xauth_location,
669: options.forward_x11_trusted, &proto, &data);
670: /* Request forwarding with authentication spoofing. */
671: debug("Requesting X11 forwarding with authentication spoofing.");
672: x11_request_forwarding_with_spoofing(id, display, proto, data);
673: /* XXX wait for reply */
674: }
675:
676: if (cctx->want_agent_fwd && options.forward_agent) {
677: debug("Requesting authentication agent forwarding.");
678: channel_request_start(id, "auth-agent-req@openssh.com", 0);
679: packet_send();
680: }
681:
1.129 deraadt 682: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 683: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 684: client_subsystem_reply);
1.127 djm 685:
1.123 djm 686: c->confirm_ctx = NULL;
687: buffer_free(&cctx->cmd);
1.126 djm 688: xfree(cctx->term);
689: if (cctx->env != NULL) {
690: for (i = 0; cctx->env[i] != NULL; i++)
691: xfree(cctx->env[i]);
692: xfree(cctx->env);
1.129 deraadt 693: }
1.126 djm 694: xfree(cctx);
1.123 djm 695: }
696:
697: static void
1.161 deraadt 698: client_process_control(fd_set *readset)
1.123 djm 699: {
700: Buffer m;
701: Channel *c;
1.139 djm 702: int client_fd, new_fd[3], ver, allowed;
1.123 djm 703: socklen_t addrlen;
704: struct sockaddr_storage addr;
705: struct confirm_ctx *cctx;
706: char *cmd;
1.139 djm 707: u_int i, len, env_len, command, flags;
1.123 djm 708: uid_t euid;
709: gid_t egid;
710:
711: /*
712: * Accept connection on control socket
713: */
714: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
715: return;
716:
717: memset(&addr, 0, sizeof(addr));
718: addrlen = sizeof(addr);
719: if ((client_fd = accept(control_fd,
720: (struct sockaddr*)&addr, &addrlen)) == -1) {
721: error("%s accept: %s", __func__, strerror(errno));
722: return;
723: }
724:
725: if (getpeereid(client_fd, &euid, &egid) < 0) {
726: error("%s getpeereid failed: %s", __func__, strerror(errno));
727: close(client_fd);
728: return;
729: }
730: if ((euid != 0) && (getuid() != euid)) {
731: error("control mode uid mismatch: peer euid %u != uid %u",
732: (u_int) euid, (u_int) getuid());
733: close(client_fd);
734: return;
735: }
1.127 djm 736:
1.134 djm 737: unset_nonblock(client_fd);
738:
739: /* Read command */
740: buffer_init(&m);
741: if (ssh_msg_recv(client_fd, &m) == -1) {
742: error("%s: client msg_recv failed", __func__);
743: close(client_fd);
744: buffer_free(&m);
745: return;
746: }
1.140 djm 747: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 748: error("%s: wrong client version %d", __func__, ver);
749: buffer_free(&m);
750: close(client_fd);
751: return;
752: }
753:
1.127 djm 754: allowed = 1;
1.134 djm 755: command = buffer_get_int(&m);
756: flags = buffer_get_int(&m);
1.123 djm 757:
1.134 djm 758: buffer_clear(&m);
1.123 djm 759:
1.134 djm 760: switch (command) {
761: case SSHMUX_COMMAND_OPEN:
1.137 djm 762: if (options.control_master == SSHCTL_MASTER_ASK ||
763: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 764: allowed = ask_permission("Allow shared connection "
765: "to %s? ", host);
766: /* continue below */
767: break;
768: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 769: if (options.control_master == SSHCTL_MASTER_ASK ||
770: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 771: allowed = ask_permission("Terminate shared connection "
772: "to %s? ", host);
773: if (allowed)
774: quit_pending = 1;
1.136 deraadt 775: /* FALLTHROUGH */
1.134 djm 776: case SSHMUX_COMMAND_ALIVE_CHECK:
777: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
778: buffer_clear(&m);
779: buffer_put_int(&m, allowed);
780: buffer_put_int(&m, getpid());
1.140 djm 781: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 782: error("%s: client msg_send failed", __func__);
783: close(client_fd);
784: buffer_free(&m);
785: return;
786: }
787: buffer_free(&m);
788: close(client_fd);
789: return;
790: default:
791: error("Unsupported command %d", command);
792: buffer_free(&m);
793: close(client_fd);
794: return;
795: }
1.123 djm 796:
1.134 djm 797: /* Reply for SSHMUX_COMMAND_OPEN */
798: buffer_clear(&m);
1.127 djm 799: buffer_put_int(&m, allowed);
1.123 djm 800: buffer_put_int(&m, getpid());
1.140 djm 801: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 802: error("%s: client msg_send failed", __func__);
803: close(client_fd);
1.127 djm 804: buffer_free(&m);
1.123 djm 805: return;
806: }
807:
1.127 djm 808: if (!allowed) {
809: error("Refused control connection");
810: close(client_fd);
811: buffer_free(&m);
812: return;
813: }
814:
1.134 djm 815: buffer_clear(&m);
1.123 djm 816: if (ssh_msg_recv(client_fd, &m) == -1) {
817: error("%s: client msg_recv failed", __func__);
818: close(client_fd);
1.127 djm 819: buffer_free(&m);
1.123 djm 820: return;
821: }
1.140 djm 822: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 823: error("%s: wrong client version %d", __func__, ver);
824: buffer_free(&m);
825: close(client_fd);
826: return;
827: }
828:
1.159 djm 829: cctx = xcalloc(1, sizeof(*cctx));
1.134 djm 830: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
831: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 832: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
833: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 834: cctx->term = buffer_get_string(&m, &len);
835:
836: cmd = buffer_get_string(&m, &len);
837: buffer_init(&cctx->cmd);
838: buffer_append(&cctx->cmd, cmd, strlen(cmd));
839:
1.126 djm 840: env_len = buffer_get_int(&m);
841: env_len = MIN(env_len, 4096);
842: debug3("%s: receiving %d env vars", __func__, env_len);
843: if (env_len != 0) {
1.159 djm 844: cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
1.126 djm 845: for (i = 0; i < env_len; i++)
846: cctx->env[i] = buffer_get_string(&m, &len);
847: cctx->env[i] = NULL;
848: }
849:
1.123 djm 850: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
851: cctx->want_tty, cctx->want_subsys, cmd);
1.163 markus 852: xfree(cmd);
1.123 djm 853:
854: /* Gather fds from client */
855: new_fd[0] = mm_receive_fd(client_fd);
856: new_fd[1] = mm_receive_fd(client_fd);
857: new_fd[2] = mm_receive_fd(client_fd);
858:
859: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
860: new_fd[0], new_fd[1], new_fd[2]);
861:
862: /* Try to pick up ttymodes from client before it goes raw */
863: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
864: error("%s: tcgetattr: %s", __func__, strerror(errno));
865:
1.134 djm 866: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 867: buffer_clear(&m);
1.140 djm 868: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 869: error("%s: client msg_send failed", __func__);
870: close(client_fd);
871: close(new_fd[0]);
872: close(new_fd[1]);
873: close(new_fd[2]);
1.127 djm 874: buffer_free(&m);
1.134 djm 875: xfree(cctx->term);
876: if (env_len != 0) {
877: for (i = 0; i < env_len; i++)
878: xfree(cctx->env[i]);
879: xfree(cctx->env);
880: }
1.123 djm 881: return;
882: }
883: buffer_free(&m);
884:
885: /* enable nonblocking unless tty */
886: if (!isatty(new_fd[0]))
887: set_nonblock(new_fd[0]);
888: if (!isatty(new_fd[1]))
889: set_nonblock(new_fd[1]);
890: if (!isatty(new_fd[2]))
891: set_nonblock(new_fd[2]);
892:
893: set_nonblock(client_fd);
894:
1.129 deraadt 895: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 896: new_fd[0], new_fd[1], new_fd[2],
897: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
898: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
899:
900: /* XXX */
901: c->ctl_fd = client_fd;
902:
903: debug3("%s: channel_new: %d", __func__, c->self);
904:
905: channel_send_open(c->self);
906: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
907: }
908:
909: static void
1.99 markus 910: process_cmdline(void)
1.97 jakob 911: {
912: void (*handler)(int);
1.135 djm 913: char *s, *cmd, *cancel_host;
1.121 djm 914: int delete = 0;
1.97 jakob 915: int local = 0;
1.135 djm 916: u_short cancel_port;
917: Forward fwd;
1.97 jakob 918:
919: leave_raw_mode();
1.101 markus 920: handler = signal(SIGINT, SIG_IGN);
1.99 markus 921: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 922: if (s == NULL)
923: goto out;
924: while (*s && isspace(*s))
925: s++;
1.121 djm 926: if (*s == '-')
927: s++; /* Skip cmdline '-', if any */
1.120 dtucker 928: if (*s == '\0')
1.97 jakob 929: goto out;
1.121 djm 930:
1.122 djm 931: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 932: logit("Commands:");
1.164 djm 933: logit(" -L[bind_address:]port:host:hostport "
934: "Request local forward");
935: logit(" -R[bind_address:]port:host:hostport "
936: "Request remote forward");
1.165 stevesk 937: logit(" -KR[bind_address:]port "
1.164 djm 938: "Cancel remote forward");
1.146 reyk 939: if (!options.permit_local_command)
940: goto out;
1.164 djm 941: logit(" !args "
942: "Execute local command");
1.146 reyk 943: goto out;
944: }
945:
946: if (*s == '!' && options.permit_local_command) {
947: s++;
948: ssh_local_cmd(s);
1.121 djm 949: goto out;
950: }
951:
952: if (*s == 'K') {
953: delete = 1;
954: s++;
955: }
956: if (*s != 'L' && *s != 'R') {
1.109 itojun 957: logit("Invalid command.");
1.97 jakob 958: goto out;
959: }
1.121 djm 960: if (*s == 'L')
1.97 jakob 961: local = 1;
1.121 djm 962: if (local && delete) {
963: logit("Not supported.");
964: goto out;
965: }
966: if ((!local || delete) && !compat20) {
1.109 itojun 967: logit("Not supported for SSH protocol version 1.");
1.97 jakob 968: goto out;
969: }
1.121 djm 970:
971: s++;
1.97 jakob 972: while (*s && isspace(*s))
973: s++;
974:
1.121 djm 975: if (delete) {
1.135 djm 976: cancel_port = 0;
977: cancel_host = hpdelim(&s); /* may be NULL */
978: if (s != NULL) {
979: cancel_port = a2port(s);
980: cancel_host = cleanhostname(cancel_host);
981: } else {
982: cancel_port = a2port(cancel_host);
983: cancel_host = NULL;
1.121 djm 984: }
1.135 djm 985: if (cancel_port == 0) {
986: logit("Bad forwarding close port");
1.121 djm 987: goto out;
988: }
1.135 djm 989: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 990: } else {
1.135 djm 991: if (!parse_forward(&fwd, s)) {
1.121 djm 992: logit("Bad forwarding specification.");
993: goto out;
994: }
995: if (local) {
1.135 djm 996: if (channel_setup_local_fwd_listener(fwd.listen_host,
997: fwd.listen_port, fwd.connect_host,
998: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 999: logit("Port forwarding failed.");
1000: goto out;
1001: }
1.135 djm 1002: } else {
1.167 markus 1003: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 1004: fwd.listen_port, fwd.connect_host,
1.167 markus 1005: fwd.connect_port) < 0) {
1006: logit("Port forwarding failed.");
1007: goto out;
1008: }
1.135 djm 1009: }
1010:
1.121 djm 1011: logit("Forwarding port.");
1012: }
1013:
1.97 jakob 1014: out:
1015: signal(SIGINT, handler);
1016: enter_raw_mode();
1017: if (cmd)
1018: xfree(cmd);
1019: }
1020:
1.31 markus 1021: /* process the characters one by one */
1.77 itojun 1022: static int
1.31 markus 1023: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1024: {
1.32 markus 1025: char string[1024];
1.31 markus 1026: pid_t pid;
1027: int bytes = 0;
1.42 markus 1028: u_int i;
1029: u_char ch;
1.31 markus 1030: char *s;
1031:
1.139 djm 1032: if (len <= 0)
1033: return (0);
1034:
1035: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1036: /* Get one character at a time. */
1037: ch = buf[i];
1038:
1039: if (escape_pending) {
1040: /* We have previously seen an escape character. */
1041: /* Clear the flag now. */
1042: escape_pending = 0;
1043:
1044: /* Process the escaped character. */
1045: switch (ch) {
1046: case '.':
1047: /* Terminate the connection. */
1.32 markus 1048: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1049: buffer_append(berr, string, strlen(string));
1.31 markus 1050:
1051: quit_pending = 1;
1052: return -1;
1053:
1054: case 'Z' - 64:
1055: /* Suspend the program. */
1056: /* Print a message to that effect to the user. */
1.32 markus 1057: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1058: buffer_append(berr, string, strlen(string));
1.31 markus 1059:
1060: /* Restore terminal modes and suspend. */
1061: client_suspend_self(bin, bout, berr);
1062:
1063: /* We have been continued. */
1064: continue;
1065:
1.111 markus 1066: case 'B':
1067: if (compat20) {
1068: snprintf(string, sizeof string,
1069: "%cB\r\n", escape_char);
1070: buffer_append(berr, string,
1071: strlen(string));
1072: channel_request_start(session_ident,
1073: "break", 0);
1074: packet_put_int(1000);
1075: packet_send();
1076: }
1077: continue;
1078:
1.54 markus 1079: case 'R':
1.59 markus 1080: if (compat20) {
1081: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1082: logit("Server does not support re-keying");
1.59 markus 1083: else
1084: need_rekeying = 1;
1085: }
1.54 markus 1086: continue;
1087:
1.31 markus 1088: case '&':
1089: /*
1090: * Detach the program (continue to serve connections,
1091: * but put in background and no more new connections).
1092: */
1093: /* Restore tty modes. */
1094: leave_raw_mode();
1095:
1096: /* Stop listening for new connections. */
1.86 markus 1097: channel_stop_listening();
1.31 markus 1098:
1.86 markus 1099: snprintf(string, sizeof string,
1100: "%c& [backgrounded]\n", escape_char);
1101: buffer_append(berr, string, strlen(string));
1.31 markus 1102:
1103: /* Fork into background. */
1104: pid = fork();
1105: if (pid < 0) {
1106: error("fork: %.100s", strerror(errno));
1107: continue;
1108: }
1109: if (pid != 0) { /* This is the parent. */
1110: /* The parent just exits. */
1111: exit(0);
1112: }
1113: /* The child continues serving connections. */
1.86 markus 1114: if (compat20) {
1115: buffer_append(bin, "\004", 1);
1116: /* fake EOF on stdin */
1117: return -1;
1118: } else if (!stdin_eof) {
1119: /*
1120: * Sending SSH_CMSG_EOF alone does not always appear
1121: * to be enough. So we try to send an EOF character
1122: * first.
1123: */
1124: packet_start(SSH_CMSG_STDIN_DATA);
1125: packet_put_string("\004", 1);
1126: packet_send();
1127: /* Close stdin. */
1128: stdin_eof = 1;
1129: if (buffer_len(bin) == 0) {
1130: packet_start(SSH_CMSG_EOF);
1131: packet_send();
1132: }
1133: }
1134: continue;
1.31 markus 1135:
1136: case '?':
1.32 markus 1137: snprintf(string, sizeof string,
1.31 markus 1138: "%c?\r\n\
1139: Supported escape sequences:\r\n\
1.104 stevesk 1140: %c. - terminate connection\r\n\
1.111 markus 1141: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1142: %cC - open a command line\r\n\
1143: %cR - Request rekey (SSH protocol 2 only)\r\n\
1144: %c^Z - suspend ssh\r\n\
1145: %c# - list forwarded connections\r\n\
1146: %c& - background ssh (when waiting for connections to terminate)\r\n\
1147: %c? - this message\r\n\
1148: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1149: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1150: escape_char, escape_char, escape_char, escape_char,
1151: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1152: escape_char, escape_char, escape_char);
1.32 markus 1153: buffer_append(berr, string, strlen(string));
1.31 markus 1154: continue;
1155:
1156: case '#':
1.32 markus 1157: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1158: buffer_append(berr, string, strlen(string));
1.31 markus 1159: s = channel_open_message();
1160: buffer_append(berr, s, strlen(s));
1161: xfree(s);
1.97 jakob 1162: continue;
1163:
1164: case 'C':
1.99 markus 1165: process_cmdline();
1.31 markus 1166: continue;
1167:
1168: default:
1169: if (ch != escape_char) {
1170: buffer_put_char(bin, escape_char);
1171: bytes++;
1172: }
1173: /* Escaped characters fall through here */
1174: break;
1175: }
1176: } else {
1177: /*
1178: * The previous character was not an escape char. Check if this
1179: * is an escape.
1180: */
1181: if (last_was_cr && ch == escape_char) {
1182: /* It is. Set the flag and continue to next character. */
1183: escape_pending = 1;
1184: continue;
1185: }
1186: }
1187:
1188: /*
1189: * Normal character. Record whether it was a newline,
1190: * and append it to the buffer.
1191: */
1192: last_was_cr = (ch == '\r' || ch == '\n');
1193: buffer_put_char(bin, ch);
1194: bytes++;
1195: }
1196: return bytes;
1197: }
1198:
1.77 itojun 1199: static void
1.161 deraadt 1200: client_process_input(fd_set *readset)
1.17 markus 1201: {
1.21 deraadt 1202: int len;
1.31 markus 1203: char buf[8192];
1.16 markus 1204:
1.11 markus 1205: /* Read input from stdin. */
1206: if (FD_ISSET(fileno(stdin), readset)) {
1207: /* Read as much as possible. */
1208: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1209: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1210: return; /* we'll try again later */
1.11 markus 1211: if (len <= 0) {
1.13 markus 1212: /*
1213: * Received EOF or error. They are treated
1214: * similarly, except that an error message is printed
1215: * if it was an error condition.
1216: */
1.11 markus 1217: if (len < 0) {
1218: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1219: buffer_append(&stderr_buffer, buf, strlen(buf));
1220: }
1221: /* Mark that we have seen EOF. */
1222: stdin_eof = 1;
1.13 markus 1223: /*
1224: * Send an EOF message to the server unless there is
1225: * data in the buffer. If there is data in the
1226: * buffer, no message will be sent now. Code
1227: * elsewhere will send the EOF when the buffer
1228: * becomes empty if stdin_eof is set.
1229: */
1.11 markus 1230: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1231: packet_start(SSH_CMSG_EOF);
1232: packet_send();
1.11 markus 1233: }
1.72 stevesk 1234: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1235: /*
1236: * Normal successful read, and no escape character.
1237: * Just append the data to buffer.
1238: */
1.11 markus 1239: buffer_append(&stdin_buffer, buf, len);
1240: } else {
1.13 markus 1241: /*
1242: * Normal, successful read. But we have an escape character
1243: * and have to process the characters one by one.
1244: */
1.52 markus 1245: if (process_escapes(&stdin_buffer, &stdout_buffer,
1246: &stderr_buffer, buf, len) == -1)
1.31 markus 1247: return;
1.11 markus 1248: }
1249: }
1250: }
1251:
1.77 itojun 1252: static void
1.161 deraadt 1253: client_process_output(fd_set *writeset)
1.11 markus 1254: {
1255: int len;
1256: char buf[100];
1.1 deraadt 1257:
1.11 markus 1258: /* Write buffered output to stdout. */
1259: if (FD_ISSET(fileno(stdout), writeset)) {
1260: /* Write as much data as possible. */
1261: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1262: buffer_len(&stdout_buffer));
1.11 markus 1263: if (len <= 0) {
1.64 markus 1264: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1265: len = 0;
1266: else {
1.13 markus 1267: /*
1268: * An error or EOF was encountered. Put an
1269: * error message to stderr buffer.
1270: */
1.11 markus 1271: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1272: buffer_append(&stderr_buffer, buf, strlen(buf));
1273: quit_pending = 1;
1274: return;
1275: }
1276: }
1277: /* Consume printed data from the buffer. */
1278: buffer_consume(&stdout_buffer, len);
1.57 markus 1279: stdout_bytes += len;
1.11 markus 1280: }
1281: /* Write buffered output to stderr. */
1282: if (FD_ISSET(fileno(stderr), writeset)) {
1283: /* Write as much data as possible. */
1284: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1285: buffer_len(&stderr_buffer));
1.11 markus 1286: if (len <= 0) {
1.64 markus 1287: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1288: len = 0;
1289: else {
1.13 markus 1290: /* EOF or error, but can't even print error message. */
1.11 markus 1291: quit_pending = 1;
1292: return;
1293: }
1294: }
1295: /* Consume printed characters from the buffer. */
1296: buffer_consume(&stderr_buffer, len);
1.57 markus 1297: stderr_bytes += len;
1.11 markus 1298: }
1.1 deraadt 1299: }
1300:
1.13 markus 1301: /*
1.15 markus 1302: * Get packets from the connection input buffer, and process them as long as
1303: * there are packets available.
1304: *
1305: * Any unknown packets received during the actual
1306: * session cause the session to terminate. This is
1307: * intended to make debugging easier since no
1308: * confirmations are sent. Any compatible protocol
1309: * extensions must be negotiated during the
1310: * preparatory phase.
1311: */
1312:
1.77 itojun 1313: static void
1.49 itojun 1314: client_process_buffered_input_packets(void)
1.15 markus 1315: {
1.54 markus 1316: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1317: }
1318:
1.31 markus 1319: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1320:
1.77 itojun 1321: static int
1.31 markus 1322: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1323: {
1.31 markus 1324: /* XXX we assume c->extended is writeable */
1325: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1326: }
1327:
1.77 itojun 1328: static void
1.60 markus 1329: client_channel_closed(int id, void *arg)
1330: {
1.83 markus 1331: channel_cancel_cleanup(id);
1.60 markus 1332: session_closed = 1;
1.113 markus 1333: leave_raw_mode();
1.60 markus 1334: }
1335:
1.15 markus 1336: /*
1.13 markus 1337: * Implements the interactive session with the server. This is called after
1338: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1339: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1340: * used as an escape character for terminating or suspending the session.
1.13 markus 1341: */
1.1 deraadt 1342:
1.20 markus 1343: int
1.30 markus 1344: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1345: {
1.46 markus 1346: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1347: double start_time, total_time;
1.130 avsm 1348: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1349: u_int nalloc = 0;
1.11 markus 1350: char buf[100];
1351:
1352: debug("Entering interactive session.");
1353:
1354: start_time = get_current_time();
1355:
1356: /* Initialize variables. */
1357: escape_pending = 0;
1358: last_was_cr = 1;
1359: exit_status = -1;
1360: stdin_eof = 0;
1361: buffer_high = 64 * 1024;
1362: connection_in = packet_get_connection_in();
1363: connection_out = packet_get_connection_out();
1.46 markus 1364: max_fd = MAX(connection_in, connection_out);
1.123 djm 1365: if (control_fd != -1)
1366: max_fd = MAX(max_fd, control_fd);
1.46 markus 1367:
1368: if (!compat20) {
1.63 markus 1369: /* enable nonblocking unless tty */
1370: if (!isatty(fileno(stdin)))
1371: set_nonblock(fileno(stdin));
1372: if (!isatty(fileno(stdout)))
1373: set_nonblock(fileno(stdout));
1374: if (!isatty(fileno(stderr)))
1375: set_nonblock(fileno(stderr));
1.46 markus 1376: max_fd = MAX(max_fd, fileno(stdin));
1377: max_fd = MAX(max_fd, fileno(stdout));
1378: max_fd = MAX(max_fd, fileno(stderr));
1379: }
1.11 markus 1380: stdin_bytes = 0;
1381: stdout_bytes = 0;
1382: stderr_bytes = 0;
1383: quit_pending = 0;
1384: escape_char = escape_char_arg;
1385:
1386: /* Initialize buffers. */
1387: buffer_init(&stdin_buffer);
1388: buffer_init(&stdout_buffer);
1389: buffer_init(&stderr_buffer);
1390:
1.15 markus 1391: client_init_dispatch();
1392:
1.105 markus 1393: /*
1394: * Set signal handlers, (e.g. to restore non-blocking mode)
1395: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1396: */
1.131 djm 1397: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1398: signal(SIGHUP, signal_handler);
1.105 markus 1399: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1400: signal(SIGINT, signal_handler);
1401: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1402: signal(SIGQUIT, signal_handler);
1403: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1404: signal(SIGTERM, signal_handler);
1.132 djm 1405: signal(SIGWINCH, window_change_handler);
1.11 markus 1406:
1407: if (have_pty)
1408: enter_raw_mode();
1409:
1.48 markus 1410: if (compat20) {
1411: session_ident = ssh2_chan_id;
1.72 stevesk 1412: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1413: channel_register_filter(session_ident,
1.149 reyk 1414: simple_escape_filter, NULL);
1.60 markus 1415: if (session_ident != -1)
1416: channel_register_cleanup(session_ident,
1.143 djm 1417: client_channel_closed, 0);
1.48 markus 1418: } else {
1419: /* Check if we should immediately send eof on stdin. */
1.16 markus 1420: client_check_initial_eof_on_stdin();
1.48 markus 1421: }
1.30 markus 1422:
1.11 markus 1423: /* Main loop of the client for the interactive session mode. */
1424: while (!quit_pending) {
1425:
1.13 markus 1426: /* Process buffered packets sent by the server. */
1.11 markus 1427: client_process_buffered_input_packets();
1428:
1.60 markus 1429: if (compat20 && session_closed && !channel_still_open())
1430: break;
1431:
1.56 markus 1432: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1433:
1.56 markus 1434: if (rekeying) {
1435: debug("rekeying in progress");
1436: } else {
1437: /*
1438: * Make packets of buffered stdin data, and buffer
1439: * them for sending to the server.
1440: */
1441: if (!compat20)
1442: client_make_packets_from_stdin_data();
1.11 markus 1443:
1.56 markus 1444: /*
1445: * Make packets from buffered channel data, and
1446: * enqueue them for sending to the server.
1447: */
1448: if (packet_not_very_much_data_to_write())
1449: channel_output_poll();
1.11 markus 1450:
1.56 markus 1451: /*
1452: * Check if the window size has changed, and buffer a
1453: * message about it to the server if so.
1454: */
1455: client_check_window_change();
1.11 markus 1456:
1.56 markus 1457: if (quit_pending)
1458: break;
1459: }
1.13 markus 1460: /*
1461: * Wait until we have something to do (something becomes
1462: * available on one of the descriptors).
1463: */
1.81 markus 1464: max_fd2 = max_fd;
1.56 markus 1465: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1466: &max_fd2, &nalloc, rekeying);
1.11 markus 1467:
1468: if (quit_pending)
1469: break;
1470:
1.56 markus 1471: /* Do channel operations unless rekeying in progress. */
1472: if (!rekeying) {
1473: channel_after_select(readset, writeset);
1.108 markus 1474: if (need_rekeying || packet_need_rekeying()) {
1475: debug("need rekeying");
1.56 markus 1476: xxx_kex->done = 0;
1477: kex_send_kexinit(xxx_kex);
1478: need_rekeying = 0;
1479: }
1480: }
1.11 markus 1481:
1.17 markus 1482: /* Buffer input from the connection. */
1.46 markus 1483: client_process_net_input(readset);
1.17 markus 1484:
1.123 djm 1485: /* Accept control connections. */
1486: client_process_control(readset);
1487:
1.17 markus 1488: if (quit_pending)
1489: break;
1.11 markus 1490:
1.17 markus 1491: if (!compat20) {
1492: /* Buffer data from stdin */
1.46 markus 1493: client_process_input(readset);
1.17 markus 1494: /*
1495: * Process output to stdout and stderr. Output to
1496: * the connection is processed elsewhere (above).
1497: */
1.46 markus 1498: client_process_output(writeset);
1.17 markus 1499: }
1.11 markus 1500:
1.13 markus 1501: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1502: if (FD_ISSET(connection_out, writeset))
1.11 markus 1503: packet_write_poll();
1504: }
1.46 markus 1505: if (readset)
1506: xfree(readset);
1507: if (writeset)
1508: xfree(writeset);
1.11 markus 1509:
1510: /* Terminate the session. */
1511:
1512: /* Stop watching for window change. */
1.132 djm 1513: signal(SIGWINCH, SIG_DFL);
1.11 markus 1514:
1.76 markus 1515: channel_free_all();
1.11 markus 1516:
1.75 markus 1517: if (have_pty)
1518: leave_raw_mode();
1519:
1520: /* restore blocking io */
1521: if (!isatty(fileno(stdin)))
1522: unset_nonblock(fileno(stdin));
1523: if (!isatty(fileno(stdout)))
1524: unset_nonblock(fileno(stdout));
1525: if (!isatty(fileno(stderr)))
1526: unset_nonblock(fileno(stderr));
1.116 dtucker 1527:
1528: /*
1529: * If there was no shell or command requested, there will be no remote
1530: * exit status to be returned. In that case, clear error code if the
1531: * connection was deliberately terminated at this end.
1532: */
1533: if (no_shell_flag && received_signal == SIGTERM) {
1534: received_signal = 0;
1535: exit_status = 0;
1536: }
1.75 markus 1537:
1.113 markus 1538: if (received_signal)
1.89 itojun 1539: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1540:
1.13 markus 1541: /*
1542: * In interactive mode (with pseudo tty) display a message indicating
1543: * that the connection has been closed.
1544: */
1.11 markus 1545: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1546: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1547: buffer_append(&stderr_buffer, buf, strlen(buf));
1548: }
1.70 markus 1549:
1.11 markus 1550: /* Output any buffered data for stdout. */
1.70 markus 1551: while (buffer_len(&stdout_buffer) > 0) {
1552: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1553: buffer_len(&stdout_buffer));
1.70 markus 1554: if (len <= 0) {
1.11 markus 1555: error("Write failed flushing stdout buffer.");
1.70 markus 1556: break;
1557: }
1.11 markus 1558: buffer_consume(&stdout_buffer, len);
1.57 markus 1559: stdout_bytes += len;
1.11 markus 1560: }
1561:
1562: /* Output any buffered data for stderr. */
1.70 markus 1563: while (buffer_len(&stderr_buffer) > 0) {
1564: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1565: buffer_len(&stderr_buffer));
1.70 markus 1566: if (len <= 0) {
1.11 markus 1567: error("Write failed flushing stderr buffer.");
1.70 markus 1568: break;
1569: }
1.11 markus 1570: buffer_consume(&stderr_buffer, len);
1.57 markus 1571: stderr_bytes += len;
1.11 markus 1572: }
1573:
1574: /* Clear and free any buffers. */
1575: memset(buf, 0, sizeof(buf));
1576: buffer_free(&stdin_buffer);
1577: buffer_free(&stdout_buffer);
1578: buffer_free(&stderr_buffer);
1579:
1580: /* Report bytes transferred, and transfer rates. */
1581: total_time = get_current_time() - start_time;
1582: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1583: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1584: if (total_time > 0)
1585: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1586: stdin_bytes / total_time, stdout_bytes / total_time,
1587: stderr_bytes / total_time);
1.11 markus 1588:
1589: /* Return the exit status of the program. */
1590: debug("Exit status %d", exit_status);
1591: return exit_status;
1.15 markus 1592: }
1593:
1594: /*********/
1595:
1.77 itojun 1596: static void
1.94 markus 1597: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1598: {
1.42 markus 1599: u_int data_len;
1.15 markus 1600: char *data = packet_get_string(&data_len);
1.93 markus 1601: packet_check_eom();
1.15 markus 1602: buffer_append(&stdout_buffer, data, data_len);
1603: memset(data, 0, data_len);
1604: xfree(data);
1605: }
1.77 itojun 1606: static void
1.94 markus 1607: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1608: {
1.42 markus 1609: u_int data_len;
1.15 markus 1610: char *data = packet_get_string(&data_len);
1.93 markus 1611: packet_check_eom();
1.15 markus 1612: buffer_append(&stderr_buffer, data, data_len);
1613: memset(data, 0, data_len);
1614: xfree(data);
1615: }
1.77 itojun 1616: static void
1.94 markus 1617: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1618: {
1619: exit_status = packet_get_int();
1.93 markus 1620: packet_check_eom();
1.15 markus 1621: /* Acknowledge the exit. */
1622: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1623: packet_send();
1624: /*
1625: * Must wait for packet to be sent since we are
1626: * exiting the loop.
1627: */
1628: packet_write_wait();
1629: /* Flag that we want to exit. */
1630: quit_pending = 1;
1631: }
1.115 markus 1632: static void
1633: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1634: {
1635: Channel *c = NULL;
1636: int remote_id, sock;
1637:
1638: /* Read the remote channel number from the message. */
1639: remote_id = packet_get_int();
1640: packet_check_eom();
1641:
1642: /*
1643: * Get a connection to the local authentication agent (this may again
1644: * get forwarded).
1645: */
1646: sock = ssh_get_authentication_socket();
1647:
1648: /*
1649: * If we could not connect the agent, send an error message back to
1650: * the server. This should never happen unless the agent dies,
1651: * because authentication forwarding is only enabled if we have an
1652: * agent.
1653: */
1654: if (sock >= 0) {
1655: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1656: -1, 0, 0, 0, "authentication agent connection", 1);
1657: c->remote_id = remote_id;
1658: c->force_drain = 1;
1659: }
1660: if (c == NULL) {
1661: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1662: packet_put_int(remote_id);
1663: } else {
1664: /* Send a confirmation to the remote host. */
1665: debug("Forwarding authentication connection.");
1666: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1667: packet_put_int(remote_id);
1668: packet_put_int(c->self);
1669: }
1670: packet_send();
1671: }
1.15 markus 1672:
1.77 itojun 1673: static Channel *
1.40 markus 1674: client_request_forwarded_tcpip(const char *request_type, int rchan)
1675: {
1.103 deraadt 1676: Channel *c = NULL;
1.40 markus 1677: char *listen_address, *originator_address;
1678: int listen_port, originator_port;
1.67 markus 1679: int sock;
1.40 markus 1680:
1681: /* Get rest of the packet */
1682: listen_address = packet_get_string(NULL);
1683: listen_port = packet_get_int();
1684: originator_address = packet_get_string(NULL);
1685: originator_port = packet_get_int();
1.93 markus 1686: packet_check_eom();
1.40 markus 1687:
1688: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1689: listen_address, listen_port, originator_address, originator_port);
1690:
1.80 stevesk 1691: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1692: if (sock < 0) {
1693: xfree(originator_address);
1694: xfree(listen_address);
1695: return NULL;
1696: }
1697: c = channel_new("forwarded-tcpip",
1698: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1699: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1700: originator_address, 1);
1.40 markus 1701: xfree(originator_address);
1702: xfree(listen_address);
1703: return c;
1704: }
1705:
1.103 deraadt 1706: static Channel *
1.40 markus 1707: client_request_x11(const char *request_type, int rchan)
1708: {
1709: Channel *c = NULL;
1710: char *originator;
1711: int originator_port;
1.67 markus 1712: int sock;
1.40 markus 1713:
1714: if (!options.forward_x11) {
1715: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1716: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1717: return NULL;
1718: }
1719: originator = packet_get_string(NULL);
1720: if (datafellows & SSH_BUG_X11FWD) {
1721: debug2("buggy server: x11 request w/o originator_port");
1722: originator_port = 0;
1723: } else {
1724: originator_port = packet_get_int();
1725: }
1.93 markus 1726: packet_check_eom();
1.40 markus 1727: /* XXX check permission */
1.47 markus 1728: debug("client_request_x11: request from %s %d", originator,
1729: originator_port);
1.67 markus 1730: xfree(originator);
1.40 markus 1731: sock = x11_connect_display();
1.67 markus 1732: if (sock < 0)
1733: return NULL;
1734: c = channel_new("x11",
1735: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1736: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1737: c->force_drain = 1;
1.40 markus 1738: return c;
1739: }
1740:
1.103 deraadt 1741: static Channel *
1.40 markus 1742: client_request_agent(const char *request_type, int rchan)
1743: {
1744: Channel *c = NULL;
1.67 markus 1745: int sock;
1.40 markus 1746:
1747: if (!options.forward_agent) {
1748: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1749: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1750: return NULL;
1751: }
1752: sock = ssh_get_authentication_socket();
1.67 markus 1753: if (sock < 0)
1754: return NULL;
1755: c = channel_new("authentication agent connection",
1756: SSH_CHANNEL_OPEN, sock, sock, -1,
1757: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1758: "authentication agent connection", 1);
1.82 markus 1759: c->force_drain = 1;
1.40 markus 1760: return c;
1761: }
1762:
1.22 markus 1763: /* XXXX move to generic input handler */
1.77 itojun 1764: static void
1.94 markus 1765: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1766: {
1767: Channel *c = NULL;
1768: char *ctype;
1769: int rchan;
1.102 markus 1770: u_int rmaxpack, rwindow, len;
1.22 markus 1771:
1772: ctype = packet_get_string(&len);
1773: rchan = packet_get_int();
1774: rwindow = packet_get_int();
1775: rmaxpack = packet_get_int();
1776:
1.24 markus 1777: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1778: ctype, rchan, rwindow, rmaxpack);
1779:
1.40 markus 1780: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1781: c = client_request_forwarded_tcpip(ctype, rchan);
1782: } else if (strcmp(ctype, "x11") == 0) {
1783: c = client_request_x11(ctype, rchan);
1784: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1785: c = client_request_agent(ctype, rchan);
1.22 markus 1786: }
1787: /* XXX duplicate : */
1788: if (c != NULL) {
1789: debug("confirm %s", ctype);
1790: c->remote_id = rchan;
1791: c->remote_window = rwindow;
1792: c->remote_maxpacket = rmaxpack;
1.69 markus 1793: if (c->type != SSH_CHANNEL_CONNECTING) {
1794: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1795: packet_put_int(c->remote_id);
1796: packet_put_int(c->self);
1797: packet_put_int(c->local_window);
1798: packet_put_int(c->local_maxpacket);
1799: packet_send();
1800: }
1.22 markus 1801: } else {
1802: debug("failure %s", ctype);
1803: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1804: packet_put_int(rchan);
1805: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1806: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1807: packet_put_cstring("open failed");
1.66 markus 1808: packet_put_cstring("");
1809: }
1.22 markus 1810: packet_send();
1811: }
1812: xfree(ctype);
1813: }
1.77 itojun 1814: static void
1.94 markus 1815: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1816: {
1817: Channel *c = NULL;
1.123 djm 1818: int exitval, id, reply, success = 0;
1.48 markus 1819: char *rtype;
1820:
1821: id = packet_get_int();
1822: rtype = packet_get_string(NULL);
1823: reply = packet_get_char();
1824:
1825: debug("client_input_channel_req: channel %d rtype %s reply %d",
1826: id, rtype, reply);
1827:
1.128 djm 1828: if (id == -1) {
1829: error("client_input_channel_req: request for channel -1");
1830: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1831: error("client_input_channel_req: channel %d: unknown channel", id);
1832: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1833: exitval = packet_get_int();
1834: if (id == session_ident) {
1835: success = 1;
1836: exit_status = exitval;
1837: } else if (c->ctl_fd == -1) {
1838: error("client_input_channel_req: unexpected channel %d",
1839: session_ident);
1840: } else {
1841: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1842: success = 1;
1843: }
1.93 markus 1844: packet_check_eom();
1.48 markus 1845: }
1846: if (reply) {
1847: packet_start(success ?
1848: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1849: packet_put_int(id);
1.48 markus 1850: packet_send();
1851: }
1852: xfree(rtype);
1853: }
1.95 markus 1854: static void
1855: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1856: {
1857: char *rtype;
1858: int want_reply;
1859: int success = 0;
1860:
1861: rtype = packet_get_string(NULL);
1862: want_reply = packet_get_char();
1.117 markus 1863: debug("client_input_global_request: rtype %s want_reply %d",
1864: rtype, want_reply);
1.95 markus 1865: if (want_reply) {
1866: packet_start(success ?
1867: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1868: packet_send();
1869: packet_write_wait();
1870: }
1871: xfree(rtype);
1872: }
1.22 markus 1873:
1.123 djm 1874: void
1.129 deraadt 1875: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1876: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1877: dispatch_fn *subsys_repl)
1878: {
1879: int len;
1.132 djm 1880: Channel *c = NULL;
1.123 djm 1881:
1882: debug2("%s: id %d", __func__, id);
1883:
1.132 djm 1884: if ((c = channel_lookup(id)) == NULL)
1885: fatal("client_session2_setup: channel %d: unknown channel", id);
1886:
1.123 djm 1887: if (want_tty) {
1888: struct winsize ws;
1889: struct termios tio;
1890:
1891: /* Store window size in the packet. */
1892: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1893: memset(&ws, 0, sizeof(ws));
1894:
1895: channel_request_start(id, "pty-req", 0);
1896: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1897: packet_put_int((u_int)ws.ws_col);
1898: packet_put_int((u_int)ws.ws_row);
1899: packet_put_int((u_int)ws.ws_xpixel);
1900: packet_put_int((u_int)ws.ws_ypixel);
1.123 djm 1901: tio = get_saved_tio();
1902: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1903: packet_send();
1904: /* XXX wait for reply */
1.132 djm 1905: c->client_tty = 1;
1.123 djm 1906: }
1907:
1908: /* Transfer any environment variables from client to server */
1.126 djm 1909: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1910: int i, j, matched;
1911: char *name, *val;
1912:
1913: debug("Sending environment.");
1.126 djm 1914: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1915: /* Split */
1.126 djm 1916: name = xstrdup(env[i]);
1.123 djm 1917: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1918: xfree(name);
1.123 djm 1919: continue;
1920: }
1921: *val++ = '\0';
1922:
1923: matched = 0;
1924: for (j = 0; j < options.num_send_env; j++) {
1925: if (match_pattern(name, options.send_env[j])) {
1926: matched = 1;
1927: break;
1928: }
1929: }
1930: if (!matched) {
1931: debug3("Ignored env %s", name);
1.144 stevesk 1932: xfree(name);
1.123 djm 1933: continue;
1934: }
1935:
1936: debug("Sending env %s = %s", name, val);
1937: channel_request_start(id, "env", 0);
1938: packet_put_cstring(name);
1939: packet_put_cstring(val);
1940: packet_send();
1.144 stevesk 1941: xfree(name);
1.123 djm 1942: }
1943: }
1944:
1945: len = buffer_len(cmd);
1946: if (len > 0) {
1947: if (len > 900)
1948: len = 900;
1949: if (want_subsystem) {
1950: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1951: channel_request_start(id, "subsystem", subsys_repl != NULL);
1952: if (subsys_repl != NULL) {
1953: /* register callback for reply */
1954: /* XXX we assume that client_loop has already been called */
1955: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1956: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1957: }
1958: } else {
1959: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1960: channel_request_start(id, "exec", 0);
1961: }
1962: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1963: packet_send();
1964: } else {
1965: channel_request_start(id, "shell", 0);
1966: packet_send();
1967: }
1968: }
1969:
1.77 itojun 1970: static void
1.49 itojun 1971: client_init_dispatch_20(void)
1.16 markus 1972: {
1.55 markus 1973: dispatch_init(&dispatch_protocol_error);
1.100 markus 1974:
1.16 markus 1975: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1976: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1977: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1978: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1979: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1980: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1981: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1982: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1983: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1984: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1985:
1986: /* rekeying */
1987: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1988:
1989: /* global request reply messages */
1990: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1991: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1992: }
1.77 itojun 1993: static void
1.49 itojun 1994: client_init_dispatch_13(void)
1.15 markus 1995: {
1996: dispatch_init(NULL);
1997: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1998: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1999: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2000: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2001: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2002: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2003: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2004: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2005: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2006:
2007: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2008: &client_input_agent_open : &deny_input_open);
1.39 markus 2009: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2010: &x11_input_open : &deny_input_open);
1.15 markus 2011: }
1.77 itojun 2012: static void
1.49 itojun 2013: client_init_dispatch_15(void)
1.15 markus 2014: {
2015: client_init_dispatch_13();
2016: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2017: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2018: }
1.79 stevesk 2019: static void
1.49 itojun 2020: client_init_dispatch(void)
1.15 markus 2021: {
1.16 markus 2022: if (compat20)
2023: client_init_dispatch_20();
2024: else if (compat13)
1.15 markus 2025: client_init_dispatch_13();
2026: else
2027: client_init_dispatch_15();
1.113 markus 2028: }
2029:
2030: /* client specific fatal cleanup */
2031: void
1.114 markus 2032: cleanup_exit(int i)
1.113 markus 2033: {
2034: leave_raw_mode();
2035: leave_non_blocking();
1.123 djm 2036: if (options.control_path != NULL && control_fd != -1)
2037: unlink(options.control_path);
1.114 markus 2038: _exit(i);
1.1 deraadt 2039: }
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