Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.173
1.173 ! stevesk 1: /* $OpenBSD: clientloop.c,v 1.172 2006/07/26 02:35:17 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>
1.173 ! stevesk 75: #include <stdlib.h>
1.170 stevesk 76: #include <string.h>
1.150 stevesk 77: #include <termios.h>
1.169 stevesk 78: #include <unistd.h>
1.1 deraadt 79:
1.45 markus 80: #include "ssh.h"
81: #include "ssh1.h"
82: #include "ssh2.h"
1.1 deraadt 83: #include "xmalloc.h"
84: #include "packet.h"
85: #include "buffer.h"
1.15 markus 86: #include "compat.h"
1.74 markus 87: #include "channels.h"
1.15 markus 88: #include "dispatch.h"
1.30 markus 89: #include "buffer.h"
90: #include "bufaux.h"
1.40 markus 91: #include "key.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: {
459: if (++server_alive_timeouts > options.server_alive_count_max)
460: packet_disconnect("Timeout, server not responding.");
461: packet_start(SSH2_MSG_GLOBAL_REQUEST);
462: packet_put_cstring("keepalive@openssh.com");
463: packet_put_char(1); /* boolean: want reply */
464: packet_send();
465: }
466:
1.13 markus 467: /*
468: * Waits until the client can do something (some data becomes available on
469: * one of the file descriptors).
470: */
1.77 itojun 471: static void
1.46 markus 472: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 473: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 474: {
1.117 markus 475: struct timeval tv, *tvp;
476: int ret;
477:
1.46 markus 478: /* Add any selections by the channel mechanism. */
1.81 markus 479: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 480:
1.16 markus 481: if (!compat20) {
1.17 markus 482: /* Read from the connection, unless our buffers are full. */
1.16 markus 483: if (buffer_len(&stdout_buffer) < buffer_high &&
484: buffer_len(&stderr_buffer) < buffer_high &&
485: channel_not_very_much_buffered_data())
1.46 markus 486: FD_SET(connection_in, *readsetp);
1.17 markus 487: /*
488: * Read from stdin, unless we have seen EOF or have very much
489: * buffered data to send to the server.
490: */
491: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 492: FD_SET(fileno(stdin), *readsetp);
1.17 markus 493:
494: /* Select stdout/stderr if have data in buffer. */
495: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 496: FD_SET(fileno(stdout), *writesetp);
1.17 markus 497: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 498: FD_SET(fileno(stderr), *writesetp);
1.16 markus 499: } else {
1.71 markus 500: /* channel_prepare_select could have closed the last channel */
1.84 markus 501: if (session_closed && !channel_still_open() &&
502: !packet_have_data_to_write()) {
503: /* clear mask since we did not call select() */
1.87 markus 504: memset(*readsetp, 0, *nallocp);
505: memset(*writesetp, 0, *nallocp);
1.84 markus 506: return;
1.71 markus 507: } else {
508: FD_SET(connection_in, *readsetp);
509: }
1.16 markus 510: }
1.11 markus 511:
512: /* Select server connection if have data to write to the server. */
513: if (packet_have_data_to_write())
1.46 markus 514: FD_SET(connection_out, *writesetp);
1.11 markus 515:
1.123 djm 516: if (control_fd != -1)
517: FD_SET(control_fd, *readsetp);
518:
1.13 markus 519: /*
520: * Wait for something to happen. This will suspend the process until
521: * some selected descriptor can be read, written, or has some other
1.117 markus 522: * event pending.
1.13 markus 523: */
1.11 markus 524:
1.117 markus 525: if (options.server_alive_interval == 0 || !compat20)
526: tvp = NULL;
1.129 deraadt 527: else {
1.117 markus 528: tv.tv_sec = options.server_alive_interval;
529: tv.tv_usec = 0;
530: tvp = &tv;
531: }
532: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
533: if (ret < 0) {
1.11 markus 534: char buf[100];
1.51 markus 535:
536: /*
537: * We have to clear the select masks, because we return.
538: * We have to return, because the mainloop checks for the flags
539: * set by the signal handlers.
540: */
1.87 markus 541: memset(*readsetp, 0, *nallocp);
542: memset(*writesetp, 0, *nallocp);
1.50 deraadt 543:
1.11 markus 544: if (errno == EINTR)
545: return;
546: /* Note: we might still have data in the buffers. */
547: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
548: buffer_append(&stderr_buffer, buf, strlen(buf));
549: quit_pending = 1;
1.117 markus 550: } else if (ret == 0)
551: server_alive_check();
1.11 markus 552: }
553:
1.77 itojun 554: static void
1.31 markus 555: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 556: {
1.11 markus 557: /* Flush stdout and stderr buffers. */
1.31 markus 558: if (buffer_len(bout) > 0)
1.112 deraadt 559: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 560: if (buffer_len(berr) > 0)
1.112 deraadt 561: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 562:
563: leave_raw_mode();
564:
1.13 markus 565: /*
566: * Free (and clear) the buffer to reduce the amount of data that gets
567: * written to swap.
568: */
1.31 markus 569: buffer_free(bin);
570: buffer_free(bout);
571: buffer_free(berr);
1.11 markus 572:
573: /* Send the suspend signal to the program itself. */
574: kill(getpid(), SIGTSTP);
575:
1.132 djm 576: /* Reset window sizes in case they have changed */
577: received_window_change_signal = 1;
1.11 markus 578:
579: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 580: buffer_init(bin);
581: buffer_init(bout);
582: buffer_init(berr);
1.11 markus 583:
584: enter_raw_mode();
585: }
586:
1.77 itojun 587: static void
1.161 deraadt 588: client_process_net_input(fd_set *readset)
1.11 markus 589: {
1.17 markus 590: int len;
591: char buf[8192];
1.11 markus 592:
1.13 markus 593: /*
594: * Read input from the server, and add any such data to the buffer of
595: * the packet subsystem.
596: */
1.11 markus 597: if (FD_ISSET(connection_in, readset)) {
598: /* Read as much as possible. */
599: len = read(connection_in, buf, sizeof(buf));
600: if (len == 0) {
601: /* Received EOF. The remote host has closed the connection. */
602: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
603: host);
1.1 deraadt 604: buffer_append(&stderr_buffer, buf, strlen(buf));
605: quit_pending = 1;
606: return;
1.11 markus 607: }
1.13 markus 608: /*
609: * There is a kernel bug on Solaris that causes select to
610: * sometimes wake up even though there is no data available.
611: */
1.53 millert 612: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 613: len = 0;
614:
615: if (len < 0) {
616: /* An error has encountered. Perhaps there is a network problem. */
617: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
618: host, strerror(errno));
619: buffer_append(&stderr_buffer, buf, strlen(buf));
620: quit_pending = 1;
621: return;
622: }
623: packet_process_incoming(buf, len);
624: }
1.17 markus 625: }
1.16 markus 626:
1.97 jakob 627: static void
1.123 djm 628: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
629: {
630: int id;
631: Channel *c;
1.129 deraadt 632:
1.123 djm 633: id = packet_get_int();
634: packet_check_eom();
635:
636: if ((c = channel_lookup(id)) == NULL) {
637: error("%s: no channel for id %d", __func__, id);
638: return;
639: }
640:
641: if (type == SSH2_MSG_CHANNEL_SUCCESS)
642: debug2("Request suceeded on channel %d", id);
643: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
644: error("Request failed on channel %d", id);
645: channel_free(c);
646: }
647: }
648:
649: static void
650: client_extra_session2_setup(int id, void *arg)
651: {
652: struct confirm_ctx *cctx = arg;
1.140 djm 653: const char *display;
1.123 djm 654: Channel *c;
1.126 djm 655: int i;
1.129 deraadt 656:
1.123 djm 657: if (cctx == NULL)
658: fatal("%s: cctx == NULL", __func__);
659: if ((c = channel_lookup(id)) == NULL)
660: fatal("%s: no channel for id %d", __func__, id);
661:
1.141 djm 662: display = getenv("DISPLAY");
1.140 djm 663: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
664: char *proto, *data;
665: /* Get reasonable local authentication information. */
666: client_x11_get_proto(display, options.xauth_location,
667: options.forward_x11_trusted, &proto, &data);
668: /* Request forwarding with authentication spoofing. */
669: debug("Requesting X11 forwarding with authentication spoofing.");
670: x11_request_forwarding_with_spoofing(id, display, proto, data);
671: /* XXX wait for reply */
672: }
673:
674: if (cctx->want_agent_fwd && options.forward_agent) {
675: debug("Requesting authentication agent forwarding.");
676: channel_request_start(id, "auth-agent-req@openssh.com", 0);
677: packet_send();
678: }
679:
1.129 deraadt 680: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 681: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 682: client_subsystem_reply);
1.127 djm 683:
1.123 djm 684: c->confirm_ctx = NULL;
685: buffer_free(&cctx->cmd);
1.126 djm 686: xfree(cctx->term);
687: if (cctx->env != NULL) {
688: for (i = 0; cctx->env[i] != NULL; i++)
689: xfree(cctx->env[i]);
690: xfree(cctx->env);
1.129 deraadt 691: }
1.126 djm 692: xfree(cctx);
1.123 djm 693: }
694:
695: static void
1.161 deraadt 696: client_process_control(fd_set *readset)
1.123 djm 697: {
698: Buffer m;
699: Channel *c;
1.139 djm 700: int client_fd, new_fd[3], ver, allowed;
1.123 djm 701: socklen_t addrlen;
702: struct sockaddr_storage addr;
703: struct confirm_ctx *cctx;
704: char *cmd;
1.139 djm 705: u_int i, len, env_len, command, flags;
1.123 djm 706: uid_t euid;
707: gid_t egid;
708:
709: /*
710: * Accept connection on control socket
711: */
712: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
713: return;
714:
715: memset(&addr, 0, sizeof(addr));
716: addrlen = sizeof(addr);
717: if ((client_fd = accept(control_fd,
718: (struct sockaddr*)&addr, &addrlen)) == -1) {
719: error("%s accept: %s", __func__, strerror(errno));
720: return;
721: }
722:
723: if (getpeereid(client_fd, &euid, &egid) < 0) {
724: error("%s getpeereid failed: %s", __func__, strerror(errno));
725: close(client_fd);
726: return;
727: }
728: if ((euid != 0) && (getuid() != euid)) {
729: error("control mode uid mismatch: peer euid %u != uid %u",
730: (u_int) euid, (u_int) getuid());
731: close(client_fd);
732: return;
733: }
1.127 djm 734:
1.134 djm 735: unset_nonblock(client_fd);
736:
737: /* Read command */
738: buffer_init(&m);
739: if (ssh_msg_recv(client_fd, &m) == -1) {
740: error("%s: client msg_recv failed", __func__);
741: close(client_fd);
742: buffer_free(&m);
743: return;
744: }
1.140 djm 745: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 746: error("%s: wrong client version %d", __func__, ver);
747: buffer_free(&m);
748: close(client_fd);
749: return;
750: }
751:
1.127 djm 752: allowed = 1;
1.134 djm 753: command = buffer_get_int(&m);
754: flags = buffer_get_int(&m);
1.123 djm 755:
1.134 djm 756: buffer_clear(&m);
1.123 djm 757:
1.134 djm 758: switch (command) {
759: case SSHMUX_COMMAND_OPEN:
1.137 djm 760: if (options.control_master == SSHCTL_MASTER_ASK ||
761: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 762: allowed = ask_permission("Allow shared connection "
763: "to %s? ", host);
764: /* continue below */
765: break;
766: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 767: if (options.control_master == SSHCTL_MASTER_ASK ||
768: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 769: allowed = ask_permission("Terminate shared connection "
770: "to %s? ", host);
771: if (allowed)
772: quit_pending = 1;
1.136 deraadt 773: /* FALLTHROUGH */
1.134 djm 774: case SSHMUX_COMMAND_ALIVE_CHECK:
775: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
776: buffer_clear(&m);
777: buffer_put_int(&m, allowed);
778: buffer_put_int(&m, getpid());
1.140 djm 779: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 780: error("%s: client msg_send failed", __func__);
781: close(client_fd);
782: buffer_free(&m);
783: return;
784: }
785: buffer_free(&m);
786: close(client_fd);
787: return;
788: default:
789: error("Unsupported command %d", command);
790: buffer_free(&m);
791: close(client_fd);
792: return;
793: }
1.123 djm 794:
1.134 djm 795: /* Reply for SSHMUX_COMMAND_OPEN */
796: buffer_clear(&m);
1.127 djm 797: buffer_put_int(&m, allowed);
1.123 djm 798: buffer_put_int(&m, getpid());
1.140 djm 799: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 800: error("%s: client msg_send failed", __func__);
801: close(client_fd);
1.127 djm 802: buffer_free(&m);
1.123 djm 803: return;
804: }
805:
1.127 djm 806: if (!allowed) {
807: error("Refused control connection");
808: close(client_fd);
809: buffer_free(&m);
810: return;
811: }
812:
1.134 djm 813: buffer_clear(&m);
1.123 djm 814: if (ssh_msg_recv(client_fd, &m) == -1) {
815: error("%s: client msg_recv failed", __func__);
816: close(client_fd);
1.127 djm 817: buffer_free(&m);
1.123 djm 818: return;
819: }
1.140 djm 820: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 821: error("%s: wrong client version %d", __func__, ver);
822: buffer_free(&m);
823: close(client_fd);
824: return;
825: }
826:
1.159 djm 827: cctx = xcalloc(1, sizeof(*cctx));
1.134 djm 828: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
829: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 830: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
831: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 832: cctx->term = buffer_get_string(&m, &len);
833:
834: cmd = buffer_get_string(&m, &len);
835: buffer_init(&cctx->cmd);
836: buffer_append(&cctx->cmd, cmd, strlen(cmd));
837:
1.126 djm 838: env_len = buffer_get_int(&m);
839: env_len = MIN(env_len, 4096);
840: debug3("%s: receiving %d env vars", __func__, env_len);
841: if (env_len != 0) {
1.159 djm 842: cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
1.126 djm 843: for (i = 0; i < env_len; i++)
844: cctx->env[i] = buffer_get_string(&m, &len);
845: cctx->env[i] = NULL;
846: }
847:
1.123 djm 848: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
849: cctx->want_tty, cctx->want_subsys, cmd);
1.163 markus 850: xfree(cmd);
1.123 djm 851:
852: /* Gather fds from client */
853: new_fd[0] = mm_receive_fd(client_fd);
854: new_fd[1] = mm_receive_fd(client_fd);
855: new_fd[2] = mm_receive_fd(client_fd);
856:
857: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
858: new_fd[0], new_fd[1], new_fd[2]);
859:
860: /* Try to pick up ttymodes from client before it goes raw */
861: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
862: error("%s: tcgetattr: %s", __func__, strerror(errno));
863:
1.134 djm 864: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 865: buffer_clear(&m);
1.140 djm 866: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 867: error("%s: client msg_send failed", __func__);
868: close(client_fd);
869: close(new_fd[0]);
870: close(new_fd[1]);
871: close(new_fd[2]);
1.127 djm 872: buffer_free(&m);
1.134 djm 873: xfree(cctx->term);
874: if (env_len != 0) {
875: for (i = 0; i < env_len; i++)
876: xfree(cctx->env[i]);
877: xfree(cctx->env);
878: }
1.123 djm 879: return;
880: }
881: buffer_free(&m);
882:
883: /* enable nonblocking unless tty */
884: if (!isatty(new_fd[0]))
885: set_nonblock(new_fd[0]);
886: if (!isatty(new_fd[1]))
887: set_nonblock(new_fd[1]);
888: if (!isatty(new_fd[2]))
889: set_nonblock(new_fd[2]);
890:
891: set_nonblock(client_fd);
892:
1.129 deraadt 893: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 894: new_fd[0], new_fd[1], new_fd[2],
895: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
896: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
897:
898: /* XXX */
899: c->ctl_fd = client_fd;
900:
901: debug3("%s: channel_new: %d", __func__, c->self);
902:
903: channel_send_open(c->self);
904: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
905: }
906:
907: static void
1.99 markus 908: process_cmdline(void)
1.97 jakob 909: {
910: void (*handler)(int);
1.135 djm 911: char *s, *cmd, *cancel_host;
1.121 djm 912: int delete = 0;
1.97 jakob 913: int local = 0;
1.135 djm 914: u_short cancel_port;
915: Forward fwd;
1.97 jakob 916:
917: leave_raw_mode();
1.101 markus 918: handler = signal(SIGINT, SIG_IGN);
1.99 markus 919: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 920: if (s == NULL)
921: goto out;
922: while (*s && isspace(*s))
923: s++;
1.121 djm 924: if (*s == '-')
925: s++; /* Skip cmdline '-', if any */
1.120 dtucker 926: if (*s == '\0')
1.97 jakob 927: goto out;
1.121 djm 928:
1.122 djm 929: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 930: logit("Commands:");
1.164 djm 931: logit(" -L[bind_address:]port:host:hostport "
932: "Request local forward");
933: logit(" -R[bind_address:]port:host:hostport "
934: "Request remote forward");
1.165 stevesk 935: logit(" -KR[bind_address:]port "
1.164 djm 936: "Cancel remote forward");
1.146 reyk 937: if (!options.permit_local_command)
938: goto out;
1.164 djm 939: logit(" !args "
940: "Execute local command");
1.146 reyk 941: goto out;
942: }
943:
944: if (*s == '!' && options.permit_local_command) {
945: s++;
946: ssh_local_cmd(s);
1.121 djm 947: goto out;
948: }
949:
950: if (*s == 'K') {
951: delete = 1;
952: s++;
953: }
954: if (*s != 'L' && *s != 'R') {
1.109 itojun 955: logit("Invalid command.");
1.97 jakob 956: goto out;
957: }
1.121 djm 958: if (*s == 'L')
1.97 jakob 959: local = 1;
1.121 djm 960: if (local && delete) {
961: logit("Not supported.");
962: goto out;
963: }
964: if ((!local || delete) && !compat20) {
1.109 itojun 965: logit("Not supported for SSH protocol version 1.");
1.97 jakob 966: goto out;
967: }
1.121 djm 968:
969: s++;
1.97 jakob 970: while (*s && isspace(*s))
971: s++;
972:
1.121 djm 973: if (delete) {
1.135 djm 974: cancel_port = 0;
975: cancel_host = hpdelim(&s); /* may be NULL */
976: if (s != NULL) {
977: cancel_port = a2port(s);
978: cancel_host = cleanhostname(cancel_host);
979: } else {
980: cancel_port = a2port(cancel_host);
981: cancel_host = NULL;
1.121 djm 982: }
1.135 djm 983: if (cancel_port == 0) {
984: logit("Bad forwarding close port");
1.121 djm 985: goto out;
986: }
1.135 djm 987: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 988: } else {
1.135 djm 989: if (!parse_forward(&fwd, s)) {
1.121 djm 990: logit("Bad forwarding specification.");
991: goto out;
992: }
993: if (local) {
1.135 djm 994: if (channel_setup_local_fwd_listener(fwd.listen_host,
995: fwd.listen_port, fwd.connect_host,
996: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 997: logit("Port forwarding failed.");
998: goto out;
999: }
1.135 djm 1000: } else {
1.167 markus 1001: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 1002: fwd.listen_port, fwd.connect_host,
1.167 markus 1003: fwd.connect_port) < 0) {
1004: logit("Port forwarding failed.");
1005: goto out;
1006: }
1.135 djm 1007: }
1008:
1.121 djm 1009: logit("Forwarding port.");
1010: }
1011:
1.97 jakob 1012: out:
1013: signal(SIGINT, handler);
1014: enter_raw_mode();
1015: if (cmd)
1016: xfree(cmd);
1017: }
1018:
1.31 markus 1019: /* process the characters one by one */
1.77 itojun 1020: static int
1.31 markus 1021: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1022: {
1.32 markus 1023: char string[1024];
1.31 markus 1024: pid_t pid;
1025: int bytes = 0;
1.42 markus 1026: u_int i;
1027: u_char ch;
1.31 markus 1028: char *s;
1029:
1.139 djm 1030: if (len <= 0)
1031: return (0);
1032:
1033: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1034: /* Get one character at a time. */
1035: ch = buf[i];
1036:
1037: if (escape_pending) {
1038: /* We have previously seen an escape character. */
1039: /* Clear the flag now. */
1040: escape_pending = 0;
1041:
1042: /* Process the escaped character. */
1043: switch (ch) {
1044: case '.':
1045: /* Terminate the connection. */
1.32 markus 1046: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1047: buffer_append(berr, string, strlen(string));
1.31 markus 1048:
1049: quit_pending = 1;
1050: return -1;
1051:
1052: case 'Z' - 64:
1053: /* Suspend the program. */
1054: /* Print a message to that effect to the user. */
1.32 markus 1055: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1056: buffer_append(berr, string, strlen(string));
1.31 markus 1057:
1058: /* Restore terminal modes and suspend. */
1059: client_suspend_self(bin, bout, berr);
1060:
1061: /* We have been continued. */
1062: continue;
1063:
1.111 markus 1064: case 'B':
1065: if (compat20) {
1066: snprintf(string, sizeof string,
1067: "%cB\r\n", escape_char);
1068: buffer_append(berr, string,
1069: strlen(string));
1070: channel_request_start(session_ident,
1071: "break", 0);
1072: packet_put_int(1000);
1073: packet_send();
1074: }
1075: continue;
1076:
1.54 markus 1077: case 'R':
1.59 markus 1078: if (compat20) {
1079: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1080: logit("Server does not support re-keying");
1.59 markus 1081: else
1082: need_rekeying = 1;
1083: }
1.54 markus 1084: continue;
1085:
1.31 markus 1086: case '&':
1087: /*
1088: * Detach the program (continue to serve connections,
1089: * but put in background and no more new connections).
1090: */
1091: /* Restore tty modes. */
1092: leave_raw_mode();
1093:
1094: /* Stop listening for new connections. */
1.86 markus 1095: channel_stop_listening();
1.31 markus 1096:
1.86 markus 1097: snprintf(string, sizeof string,
1098: "%c& [backgrounded]\n", escape_char);
1099: buffer_append(berr, string, strlen(string));
1.31 markus 1100:
1101: /* Fork into background. */
1102: pid = fork();
1103: if (pid < 0) {
1104: error("fork: %.100s", strerror(errno));
1105: continue;
1106: }
1107: if (pid != 0) { /* This is the parent. */
1108: /* The parent just exits. */
1109: exit(0);
1110: }
1111: /* The child continues serving connections. */
1.86 markus 1112: if (compat20) {
1113: buffer_append(bin, "\004", 1);
1114: /* fake EOF on stdin */
1115: return -1;
1116: } else if (!stdin_eof) {
1117: /*
1118: * Sending SSH_CMSG_EOF alone does not always appear
1119: * to be enough. So we try to send an EOF character
1120: * first.
1121: */
1122: packet_start(SSH_CMSG_STDIN_DATA);
1123: packet_put_string("\004", 1);
1124: packet_send();
1125: /* Close stdin. */
1126: stdin_eof = 1;
1127: if (buffer_len(bin) == 0) {
1128: packet_start(SSH_CMSG_EOF);
1129: packet_send();
1130: }
1131: }
1132: continue;
1.31 markus 1133:
1134: case '?':
1.32 markus 1135: snprintf(string, sizeof string,
1.31 markus 1136: "%c?\r\n\
1137: Supported escape sequences:\r\n\
1.104 stevesk 1138: %c. - terminate connection\r\n\
1.111 markus 1139: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1140: %cC - open a command line\r\n\
1141: %cR - Request rekey (SSH protocol 2 only)\r\n\
1142: %c^Z - suspend ssh\r\n\
1143: %c# - list forwarded connections\r\n\
1144: %c& - background ssh (when waiting for connections to terminate)\r\n\
1145: %c? - this message\r\n\
1146: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1147: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1148: escape_char, escape_char, escape_char, escape_char,
1149: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1150: escape_char, escape_char, escape_char);
1.32 markus 1151: buffer_append(berr, string, strlen(string));
1.31 markus 1152: continue;
1153:
1154: case '#':
1.32 markus 1155: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1156: buffer_append(berr, string, strlen(string));
1.31 markus 1157: s = channel_open_message();
1158: buffer_append(berr, s, strlen(s));
1159: xfree(s);
1.97 jakob 1160: continue;
1161:
1162: case 'C':
1.99 markus 1163: process_cmdline();
1.31 markus 1164: continue;
1165:
1166: default:
1167: if (ch != escape_char) {
1168: buffer_put_char(bin, escape_char);
1169: bytes++;
1170: }
1171: /* Escaped characters fall through here */
1172: break;
1173: }
1174: } else {
1175: /*
1176: * The previous character was not an escape char. Check if this
1177: * is an escape.
1178: */
1179: if (last_was_cr && ch == escape_char) {
1180: /* It is. Set the flag and continue to next character. */
1181: escape_pending = 1;
1182: continue;
1183: }
1184: }
1185:
1186: /*
1187: * Normal character. Record whether it was a newline,
1188: * and append it to the buffer.
1189: */
1190: last_was_cr = (ch == '\r' || ch == '\n');
1191: buffer_put_char(bin, ch);
1192: bytes++;
1193: }
1194: return bytes;
1195: }
1196:
1.77 itojun 1197: static void
1.161 deraadt 1198: client_process_input(fd_set *readset)
1.17 markus 1199: {
1.21 deraadt 1200: int len;
1.31 markus 1201: char buf[8192];
1.16 markus 1202:
1.11 markus 1203: /* Read input from stdin. */
1204: if (FD_ISSET(fileno(stdin), readset)) {
1205: /* Read as much as possible. */
1206: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1207: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1208: return; /* we'll try again later */
1.11 markus 1209: if (len <= 0) {
1.13 markus 1210: /*
1211: * Received EOF or error. They are treated
1212: * similarly, except that an error message is printed
1213: * if it was an error condition.
1214: */
1.11 markus 1215: if (len < 0) {
1216: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1217: buffer_append(&stderr_buffer, buf, strlen(buf));
1218: }
1219: /* Mark that we have seen EOF. */
1220: stdin_eof = 1;
1.13 markus 1221: /*
1222: * Send an EOF message to the server unless there is
1223: * data in the buffer. If there is data in the
1224: * buffer, no message will be sent now. Code
1225: * elsewhere will send the EOF when the buffer
1226: * becomes empty if stdin_eof is set.
1227: */
1.11 markus 1228: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1229: packet_start(SSH_CMSG_EOF);
1230: packet_send();
1.11 markus 1231: }
1.72 stevesk 1232: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1233: /*
1234: * Normal successful read, and no escape character.
1235: * Just append the data to buffer.
1236: */
1.11 markus 1237: buffer_append(&stdin_buffer, buf, len);
1238: } else {
1.13 markus 1239: /*
1240: * Normal, successful read. But we have an escape character
1241: * and have to process the characters one by one.
1242: */
1.52 markus 1243: if (process_escapes(&stdin_buffer, &stdout_buffer,
1244: &stderr_buffer, buf, len) == -1)
1.31 markus 1245: return;
1.11 markus 1246: }
1247: }
1248: }
1249:
1.77 itojun 1250: static void
1.161 deraadt 1251: client_process_output(fd_set *writeset)
1.11 markus 1252: {
1253: int len;
1254: char buf[100];
1.1 deraadt 1255:
1.11 markus 1256: /* Write buffered output to stdout. */
1257: if (FD_ISSET(fileno(stdout), writeset)) {
1258: /* Write as much data as possible. */
1259: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1260: buffer_len(&stdout_buffer));
1.11 markus 1261: if (len <= 0) {
1.64 markus 1262: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1263: len = 0;
1264: else {
1.13 markus 1265: /*
1266: * An error or EOF was encountered. Put an
1267: * error message to stderr buffer.
1268: */
1.11 markus 1269: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1270: buffer_append(&stderr_buffer, buf, strlen(buf));
1271: quit_pending = 1;
1272: return;
1273: }
1274: }
1275: /* Consume printed data from the buffer. */
1276: buffer_consume(&stdout_buffer, len);
1.57 markus 1277: stdout_bytes += len;
1.11 markus 1278: }
1279: /* Write buffered output to stderr. */
1280: if (FD_ISSET(fileno(stderr), writeset)) {
1281: /* Write as much data as possible. */
1282: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1283: buffer_len(&stderr_buffer));
1.11 markus 1284: if (len <= 0) {
1.64 markus 1285: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1286: len = 0;
1287: else {
1.13 markus 1288: /* EOF or error, but can't even print error message. */
1.11 markus 1289: quit_pending = 1;
1290: return;
1291: }
1292: }
1293: /* Consume printed characters from the buffer. */
1294: buffer_consume(&stderr_buffer, len);
1.57 markus 1295: stderr_bytes += len;
1.11 markus 1296: }
1.1 deraadt 1297: }
1298:
1.13 markus 1299: /*
1.15 markus 1300: * Get packets from the connection input buffer, and process them as long as
1301: * there are packets available.
1302: *
1303: * Any unknown packets received during the actual
1304: * session cause the session to terminate. This is
1305: * intended to make debugging easier since no
1306: * confirmations are sent. Any compatible protocol
1307: * extensions must be negotiated during the
1308: * preparatory phase.
1309: */
1310:
1.77 itojun 1311: static void
1.49 itojun 1312: client_process_buffered_input_packets(void)
1.15 markus 1313: {
1.54 markus 1314: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1315: }
1316:
1.31 markus 1317: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1318:
1.77 itojun 1319: static int
1.31 markus 1320: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1321: {
1.31 markus 1322: /* XXX we assume c->extended is writeable */
1323: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1324: }
1325:
1.77 itojun 1326: static void
1.60 markus 1327: client_channel_closed(int id, void *arg)
1328: {
1.83 markus 1329: channel_cancel_cleanup(id);
1.60 markus 1330: session_closed = 1;
1.113 markus 1331: leave_raw_mode();
1.60 markus 1332: }
1333:
1.15 markus 1334: /*
1.13 markus 1335: * Implements the interactive session with the server. This is called after
1336: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1337: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1338: * used as an escape character for terminating or suspending the session.
1.13 markus 1339: */
1.1 deraadt 1340:
1.20 markus 1341: int
1.30 markus 1342: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1343: {
1.46 markus 1344: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1345: double start_time, total_time;
1.130 avsm 1346: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1347: u_int nalloc = 0;
1.11 markus 1348: char buf[100];
1349:
1350: debug("Entering interactive session.");
1351:
1352: start_time = get_current_time();
1353:
1354: /* Initialize variables. */
1355: escape_pending = 0;
1356: last_was_cr = 1;
1357: exit_status = -1;
1358: stdin_eof = 0;
1359: buffer_high = 64 * 1024;
1360: connection_in = packet_get_connection_in();
1361: connection_out = packet_get_connection_out();
1.46 markus 1362: max_fd = MAX(connection_in, connection_out);
1.123 djm 1363: if (control_fd != -1)
1364: max_fd = MAX(max_fd, control_fd);
1.46 markus 1365:
1366: if (!compat20) {
1.63 markus 1367: /* enable nonblocking unless tty */
1368: if (!isatty(fileno(stdin)))
1369: set_nonblock(fileno(stdin));
1370: if (!isatty(fileno(stdout)))
1371: set_nonblock(fileno(stdout));
1372: if (!isatty(fileno(stderr)))
1373: set_nonblock(fileno(stderr));
1.46 markus 1374: max_fd = MAX(max_fd, fileno(stdin));
1375: max_fd = MAX(max_fd, fileno(stdout));
1376: max_fd = MAX(max_fd, fileno(stderr));
1377: }
1.11 markus 1378: stdin_bytes = 0;
1379: stdout_bytes = 0;
1380: stderr_bytes = 0;
1381: quit_pending = 0;
1382: escape_char = escape_char_arg;
1383:
1384: /* Initialize buffers. */
1385: buffer_init(&stdin_buffer);
1386: buffer_init(&stdout_buffer);
1387: buffer_init(&stderr_buffer);
1388:
1.15 markus 1389: client_init_dispatch();
1390:
1.105 markus 1391: /*
1392: * Set signal handlers, (e.g. to restore non-blocking mode)
1393: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1394: */
1.131 djm 1395: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1396: signal(SIGHUP, signal_handler);
1.105 markus 1397: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1398: signal(SIGINT, signal_handler);
1399: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1400: signal(SIGQUIT, signal_handler);
1401: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1402: signal(SIGTERM, signal_handler);
1.132 djm 1403: signal(SIGWINCH, window_change_handler);
1.11 markus 1404:
1405: if (have_pty)
1406: enter_raw_mode();
1407:
1.48 markus 1408: if (compat20) {
1409: session_ident = ssh2_chan_id;
1.72 stevesk 1410: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1411: channel_register_filter(session_ident,
1.149 reyk 1412: simple_escape_filter, NULL);
1.60 markus 1413: if (session_ident != -1)
1414: channel_register_cleanup(session_ident,
1.143 djm 1415: client_channel_closed, 0);
1.48 markus 1416: } else {
1417: /* Check if we should immediately send eof on stdin. */
1.16 markus 1418: client_check_initial_eof_on_stdin();
1.48 markus 1419: }
1.30 markus 1420:
1.11 markus 1421: /* Main loop of the client for the interactive session mode. */
1422: while (!quit_pending) {
1423:
1.13 markus 1424: /* Process buffered packets sent by the server. */
1.11 markus 1425: client_process_buffered_input_packets();
1426:
1.60 markus 1427: if (compat20 && session_closed && !channel_still_open())
1428: break;
1429:
1.56 markus 1430: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1431:
1.56 markus 1432: if (rekeying) {
1433: debug("rekeying in progress");
1434: } else {
1435: /*
1436: * Make packets of buffered stdin data, and buffer
1437: * them for sending to the server.
1438: */
1439: if (!compat20)
1440: client_make_packets_from_stdin_data();
1.11 markus 1441:
1.56 markus 1442: /*
1443: * Make packets from buffered channel data, and
1444: * enqueue them for sending to the server.
1445: */
1446: if (packet_not_very_much_data_to_write())
1447: channel_output_poll();
1.11 markus 1448:
1.56 markus 1449: /*
1450: * Check if the window size has changed, and buffer a
1451: * message about it to the server if so.
1452: */
1453: client_check_window_change();
1.11 markus 1454:
1.56 markus 1455: if (quit_pending)
1456: break;
1457: }
1.13 markus 1458: /*
1459: * Wait until we have something to do (something becomes
1460: * available on one of the descriptors).
1461: */
1.81 markus 1462: max_fd2 = max_fd;
1.56 markus 1463: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1464: &max_fd2, &nalloc, rekeying);
1.11 markus 1465:
1466: if (quit_pending)
1467: break;
1468:
1.56 markus 1469: /* Do channel operations unless rekeying in progress. */
1470: if (!rekeying) {
1471: channel_after_select(readset, writeset);
1.108 markus 1472: if (need_rekeying || packet_need_rekeying()) {
1473: debug("need rekeying");
1.56 markus 1474: xxx_kex->done = 0;
1475: kex_send_kexinit(xxx_kex);
1476: need_rekeying = 0;
1477: }
1478: }
1.11 markus 1479:
1.17 markus 1480: /* Buffer input from the connection. */
1.46 markus 1481: client_process_net_input(readset);
1.17 markus 1482:
1.123 djm 1483: /* Accept control connections. */
1484: client_process_control(readset);
1485:
1.17 markus 1486: if (quit_pending)
1487: break;
1.11 markus 1488:
1.17 markus 1489: if (!compat20) {
1490: /* Buffer data from stdin */
1.46 markus 1491: client_process_input(readset);
1.17 markus 1492: /*
1493: * Process output to stdout and stderr. Output to
1494: * the connection is processed elsewhere (above).
1495: */
1.46 markus 1496: client_process_output(writeset);
1.17 markus 1497: }
1.11 markus 1498:
1.13 markus 1499: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1500: if (FD_ISSET(connection_out, writeset))
1.11 markus 1501: packet_write_poll();
1502: }
1.46 markus 1503: if (readset)
1504: xfree(readset);
1505: if (writeset)
1506: xfree(writeset);
1.11 markus 1507:
1508: /* Terminate the session. */
1509:
1510: /* Stop watching for window change. */
1.132 djm 1511: signal(SIGWINCH, SIG_DFL);
1.11 markus 1512:
1.76 markus 1513: channel_free_all();
1.11 markus 1514:
1.75 markus 1515: if (have_pty)
1516: leave_raw_mode();
1517:
1518: /* restore blocking io */
1519: if (!isatty(fileno(stdin)))
1520: unset_nonblock(fileno(stdin));
1521: if (!isatty(fileno(stdout)))
1522: unset_nonblock(fileno(stdout));
1523: if (!isatty(fileno(stderr)))
1524: unset_nonblock(fileno(stderr));
1.116 dtucker 1525:
1526: /*
1527: * If there was no shell or command requested, there will be no remote
1528: * exit status to be returned. In that case, clear error code if the
1529: * connection was deliberately terminated at this end.
1530: */
1531: if (no_shell_flag && received_signal == SIGTERM) {
1532: received_signal = 0;
1533: exit_status = 0;
1534: }
1.75 markus 1535:
1.113 markus 1536: if (received_signal)
1.89 itojun 1537: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1538:
1.13 markus 1539: /*
1540: * In interactive mode (with pseudo tty) display a message indicating
1541: * that the connection has been closed.
1542: */
1.11 markus 1543: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1544: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1545: buffer_append(&stderr_buffer, buf, strlen(buf));
1546: }
1.70 markus 1547:
1.11 markus 1548: /* Output any buffered data for stdout. */
1.70 markus 1549: while (buffer_len(&stdout_buffer) > 0) {
1550: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1551: buffer_len(&stdout_buffer));
1.70 markus 1552: if (len <= 0) {
1.11 markus 1553: error("Write failed flushing stdout buffer.");
1.70 markus 1554: break;
1555: }
1.11 markus 1556: buffer_consume(&stdout_buffer, len);
1.57 markus 1557: stdout_bytes += len;
1.11 markus 1558: }
1559:
1560: /* Output any buffered data for stderr. */
1.70 markus 1561: while (buffer_len(&stderr_buffer) > 0) {
1562: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1563: buffer_len(&stderr_buffer));
1.70 markus 1564: if (len <= 0) {
1.11 markus 1565: error("Write failed flushing stderr buffer.");
1.70 markus 1566: break;
1567: }
1.11 markus 1568: buffer_consume(&stderr_buffer, len);
1.57 markus 1569: stderr_bytes += len;
1.11 markus 1570: }
1571:
1572: /* Clear and free any buffers. */
1573: memset(buf, 0, sizeof(buf));
1574: buffer_free(&stdin_buffer);
1575: buffer_free(&stdout_buffer);
1576: buffer_free(&stderr_buffer);
1577:
1578: /* Report bytes transferred, and transfer rates. */
1579: total_time = get_current_time() - start_time;
1580: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1581: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1582: if (total_time > 0)
1583: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1584: stdin_bytes / total_time, stdout_bytes / total_time,
1585: stderr_bytes / total_time);
1.11 markus 1586:
1587: /* Return the exit status of the program. */
1588: debug("Exit status %d", exit_status);
1589: return exit_status;
1.15 markus 1590: }
1591:
1592: /*********/
1593:
1.77 itojun 1594: static void
1.94 markus 1595: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1596: {
1.42 markus 1597: u_int data_len;
1.15 markus 1598: char *data = packet_get_string(&data_len);
1.93 markus 1599: packet_check_eom();
1.15 markus 1600: buffer_append(&stdout_buffer, data, data_len);
1601: memset(data, 0, data_len);
1602: xfree(data);
1603: }
1.77 itojun 1604: static void
1.94 markus 1605: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1606: {
1.42 markus 1607: u_int data_len;
1.15 markus 1608: char *data = packet_get_string(&data_len);
1.93 markus 1609: packet_check_eom();
1.15 markus 1610: buffer_append(&stderr_buffer, data, data_len);
1611: memset(data, 0, data_len);
1612: xfree(data);
1613: }
1.77 itojun 1614: static void
1.94 markus 1615: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1616: {
1617: exit_status = packet_get_int();
1.93 markus 1618: packet_check_eom();
1.15 markus 1619: /* Acknowledge the exit. */
1620: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1621: packet_send();
1622: /*
1623: * Must wait for packet to be sent since we are
1624: * exiting the loop.
1625: */
1626: packet_write_wait();
1627: /* Flag that we want to exit. */
1628: quit_pending = 1;
1629: }
1.115 markus 1630: static void
1631: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1632: {
1633: Channel *c = NULL;
1634: int remote_id, sock;
1635:
1636: /* Read the remote channel number from the message. */
1637: remote_id = packet_get_int();
1638: packet_check_eom();
1639:
1640: /*
1641: * Get a connection to the local authentication agent (this may again
1642: * get forwarded).
1643: */
1644: sock = ssh_get_authentication_socket();
1645:
1646: /*
1647: * If we could not connect the agent, send an error message back to
1648: * the server. This should never happen unless the agent dies,
1649: * because authentication forwarding is only enabled if we have an
1650: * agent.
1651: */
1652: if (sock >= 0) {
1653: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1654: -1, 0, 0, 0, "authentication agent connection", 1);
1655: c->remote_id = remote_id;
1656: c->force_drain = 1;
1657: }
1658: if (c == NULL) {
1659: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1660: packet_put_int(remote_id);
1661: } else {
1662: /* Send a confirmation to the remote host. */
1663: debug("Forwarding authentication connection.");
1664: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1665: packet_put_int(remote_id);
1666: packet_put_int(c->self);
1667: }
1668: packet_send();
1669: }
1.15 markus 1670:
1.77 itojun 1671: static Channel *
1.40 markus 1672: client_request_forwarded_tcpip(const char *request_type, int rchan)
1673: {
1.103 deraadt 1674: Channel *c = NULL;
1.40 markus 1675: char *listen_address, *originator_address;
1676: int listen_port, originator_port;
1.67 markus 1677: int sock;
1.40 markus 1678:
1679: /* Get rest of the packet */
1680: listen_address = packet_get_string(NULL);
1681: listen_port = packet_get_int();
1682: originator_address = packet_get_string(NULL);
1683: originator_port = packet_get_int();
1.93 markus 1684: packet_check_eom();
1.40 markus 1685:
1686: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1687: listen_address, listen_port, originator_address, originator_port);
1688:
1.80 stevesk 1689: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1690: if (sock < 0) {
1691: xfree(originator_address);
1692: xfree(listen_address);
1693: return NULL;
1694: }
1695: c = channel_new("forwarded-tcpip",
1696: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1697: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1698: originator_address, 1);
1.40 markus 1699: xfree(originator_address);
1700: xfree(listen_address);
1701: return c;
1702: }
1703:
1.103 deraadt 1704: static Channel *
1.40 markus 1705: client_request_x11(const char *request_type, int rchan)
1706: {
1707: Channel *c = NULL;
1708: char *originator;
1709: int originator_port;
1.67 markus 1710: int sock;
1.40 markus 1711:
1712: if (!options.forward_x11) {
1713: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1714: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1715: return NULL;
1716: }
1717: originator = packet_get_string(NULL);
1718: if (datafellows & SSH_BUG_X11FWD) {
1719: debug2("buggy server: x11 request w/o originator_port");
1720: originator_port = 0;
1721: } else {
1722: originator_port = packet_get_int();
1723: }
1.93 markus 1724: packet_check_eom();
1.40 markus 1725: /* XXX check permission */
1.47 markus 1726: debug("client_request_x11: request from %s %d", originator,
1727: originator_port);
1.67 markus 1728: xfree(originator);
1.40 markus 1729: sock = x11_connect_display();
1.67 markus 1730: if (sock < 0)
1731: return NULL;
1732: c = channel_new("x11",
1733: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1734: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1735: c->force_drain = 1;
1.40 markus 1736: return c;
1737: }
1738:
1.103 deraadt 1739: static Channel *
1.40 markus 1740: client_request_agent(const char *request_type, int rchan)
1741: {
1742: Channel *c = NULL;
1.67 markus 1743: int sock;
1.40 markus 1744:
1745: if (!options.forward_agent) {
1746: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1747: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1748: return NULL;
1749: }
1750: sock = ssh_get_authentication_socket();
1.67 markus 1751: if (sock < 0)
1752: return NULL;
1753: c = channel_new("authentication agent connection",
1754: SSH_CHANNEL_OPEN, sock, sock, -1,
1755: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1756: "authentication agent connection", 1);
1.82 markus 1757: c->force_drain = 1;
1.40 markus 1758: return c;
1759: }
1760:
1.22 markus 1761: /* XXXX move to generic input handler */
1.77 itojun 1762: static void
1.94 markus 1763: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1764: {
1765: Channel *c = NULL;
1766: char *ctype;
1767: int rchan;
1.102 markus 1768: u_int rmaxpack, rwindow, len;
1.22 markus 1769:
1770: ctype = packet_get_string(&len);
1771: rchan = packet_get_int();
1772: rwindow = packet_get_int();
1773: rmaxpack = packet_get_int();
1774:
1.24 markus 1775: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1776: ctype, rchan, rwindow, rmaxpack);
1777:
1.40 markus 1778: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1779: c = client_request_forwarded_tcpip(ctype, rchan);
1780: } else if (strcmp(ctype, "x11") == 0) {
1781: c = client_request_x11(ctype, rchan);
1782: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1783: c = client_request_agent(ctype, rchan);
1.22 markus 1784: }
1785: /* XXX duplicate : */
1786: if (c != NULL) {
1787: debug("confirm %s", ctype);
1788: c->remote_id = rchan;
1789: c->remote_window = rwindow;
1790: c->remote_maxpacket = rmaxpack;
1.69 markus 1791: if (c->type != SSH_CHANNEL_CONNECTING) {
1792: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1793: packet_put_int(c->remote_id);
1794: packet_put_int(c->self);
1795: packet_put_int(c->local_window);
1796: packet_put_int(c->local_maxpacket);
1797: packet_send();
1798: }
1.22 markus 1799: } else {
1800: debug("failure %s", ctype);
1801: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1802: packet_put_int(rchan);
1803: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1804: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1805: packet_put_cstring("open failed");
1.66 markus 1806: packet_put_cstring("");
1807: }
1.22 markus 1808: packet_send();
1809: }
1810: xfree(ctype);
1811: }
1.77 itojun 1812: static void
1.94 markus 1813: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1814: {
1815: Channel *c = NULL;
1.123 djm 1816: int exitval, id, reply, success = 0;
1.48 markus 1817: char *rtype;
1818:
1819: id = packet_get_int();
1820: rtype = packet_get_string(NULL);
1821: reply = packet_get_char();
1822:
1823: debug("client_input_channel_req: channel %d rtype %s reply %d",
1824: id, rtype, reply);
1825:
1.128 djm 1826: if (id == -1) {
1827: error("client_input_channel_req: request for channel -1");
1828: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1829: error("client_input_channel_req: channel %d: unknown channel", id);
1830: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1831: exitval = packet_get_int();
1832: if (id == session_ident) {
1833: success = 1;
1834: exit_status = exitval;
1835: } else if (c->ctl_fd == -1) {
1836: error("client_input_channel_req: unexpected channel %d",
1837: session_ident);
1838: } else {
1839: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1840: success = 1;
1841: }
1.93 markus 1842: packet_check_eom();
1.48 markus 1843: }
1844: if (reply) {
1845: packet_start(success ?
1846: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1847: packet_put_int(id);
1.48 markus 1848: packet_send();
1849: }
1850: xfree(rtype);
1851: }
1.95 markus 1852: static void
1853: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1854: {
1855: char *rtype;
1856: int want_reply;
1857: int success = 0;
1858:
1859: rtype = packet_get_string(NULL);
1860: want_reply = packet_get_char();
1.117 markus 1861: debug("client_input_global_request: rtype %s want_reply %d",
1862: rtype, want_reply);
1.95 markus 1863: if (want_reply) {
1864: packet_start(success ?
1865: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1866: packet_send();
1867: packet_write_wait();
1868: }
1869: xfree(rtype);
1870: }
1.22 markus 1871:
1.123 djm 1872: void
1.129 deraadt 1873: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1874: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1875: dispatch_fn *subsys_repl)
1876: {
1877: int len;
1.132 djm 1878: Channel *c = NULL;
1.123 djm 1879:
1880: debug2("%s: id %d", __func__, id);
1881:
1.132 djm 1882: if ((c = channel_lookup(id)) == NULL)
1883: fatal("client_session2_setup: channel %d: unknown channel", id);
1884:
1.123 djm 1885: if (want_tty) {
1886: struct winsize ws;
1887: struct termios tio;
1888:
1889: /* Store window size in the packet. */
1890: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1891: memset(&ws, 0, sizeof(ws));
1892:
1893: channel_request_start(id, "pty-req", 0);
1894: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1895: packet_put_int((u_int)ws.ws_col);
1896: packet_put_int((u_int)ws.ws_row);
1897: packet_put_int((u_int)ws.ws_xpixel);
1898: packet_put_int((u_int)ws.ws_ypixel);
1.123 djm 1899: tio = get_saved_tio();
1900: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1901: packet_send();
1902: /* XXX wait for reply */
1.132 djm 1903: c->client_tty = 1;
1.123 djm 1904: }
1905:
1906: /* Transfer any environment variables from client to server */
1.126 djm 1907: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1908: int i, j, matched;
1909: char *name, *val;
1910:
1911: debug("Sending environment.");
1.126 djm 1912: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1913: /* Split */
1.126 djm 1914: name = xstrdup(env[i]);
1.123 djm 1915: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1916: xfree(name);
1.123 djm 1917: continue;
1918: }
1919: *val++ = '\0';
1920:
1921: matched = 0;
1922: for (j = 0; j < options.num_send_env; j++) {
1923: if (match_pattern(name, options.send_env[j])) {
1924: matched = 1;
1925: break;
1926: }
1927: }
1928: if (!matched) {
1929: debug3("Ignored env %s", name);
1.144 stevesk 1930: xfree(name);
1.123 djm 1931: continue;
1932: }
1933:
1934: debug("Sending env %s = %s", name, val);
1935: channel_request_start(id, "env", 0);
1936: packet_put_cstring(name);
1937: packet_put_cstring(val);
1938: packet_send();
1.144 stevesk 1939: xfree(name);
1.123 djm 1940: }
1941: }
1942:
1943: len = buffer_len(cmd);
1944: if (len > 0) {
1945: if (len > 900)
1946: len = 900;
1947: if (want_subsystem) {
1948: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1949: channel_request_start(id, "subsystem", subsys_repl != NULL);
1950: if (subsys_repl != NULL) {
1951: /* register callback for reply */
1952: /* XXX we assume that client_loop has already been called */
1953: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1954: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1955: }
1956: } else {
1957: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1958: channel_request_start(id, "exec", 0);
1959: }
1960: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1961: packet_send();
1962: } else {
1963: channel_request_start(id, "shell", 0);
1964: packet_send();
1965: }
1966: }
1967:
1.77 itojun 1968: static void
1.49 itojun 1969: client_init_dispatch_20(void)
1.16 markus 1970: {
1.55 markus 1971: dispatch_init(&dispatch_protocol_error);
1.100 markus 1972:
1.16 markus 1973: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1974: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1975: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1976: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1977: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1978: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1979: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1980: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1981: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1982: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1983:
1984: /* rekeying */
1985: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1986:
1987: /* global request reply messages */
1988: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1989: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1990: }
1.77 itojun 1991: static void
1.49 itojun 1992: client_init_dispatch_13(void)
1.15 markus 1993: {
1994: dispatch_init(NULL);
1995: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1996: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1997: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1998: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1999: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2000: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2001: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2002: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2003: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2004:
2005: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2006: &client_input_agent_open : &deny_input_open);
1.39 markus 2007: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2008: &x11_input_open : &deny_input_open);
1.15 markus 2009: }
1.77 itojun 2010: static void
1.49 itojun 2011: client_init_dispatch_15(void)
1.15 markus 2012: {
2013: client_init_dispatch_13();
2014: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2015: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2016: }
1.79 stevesk 2017: static void
1.49 itojun 2018: client_init_dispatch(void)
1.15 markus 2019: {
1.16 markus 2020: if (compat20)
2021: client_init_dispatch_20();
2022: else if (compat13)
1.15 markus 2023: client_init_dispatch_13();
2024: else
2025: client_init_dispatch_15();
1.113 markus 2026: }
2027:
2028: /* client specific fatal cleanup */
2029: void
1.114 markus 2030: cleanup_exit(int i)
1.113 markus 2031: {
2032: leave_raw_mode();
2033: leave_non_blocking();
1.123 djm 2034: if (options.control_path != NULL && control_fd != -1)
2035: unlink(options.control_path);
1.114 markus 2036: _exit(i);
1.1 deraadt 2037: }
![[BACK]](/icons/back.gif){kind=icon}
Return to clientloop.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh