Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.170
1.170 ! stevesk 1: /* $OpenBSD: clientloop.c,v 1.169 2006/07/17 01:31:09 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>
1.150 stevesk 68:
1.155 stevesk 69: #include <ctype.h>
1.168 stevesk 70: #include <errno.h>
1.151 stevesk 71: #include <paths.h>
1.153 stevesk 72: #include <signal.h>
1.170 ! stevesk 73: #include <string.h>
1.150 stevesk 74: #include <termios.h>
1.169 stevesk 75: #include <unistd.h>
1.1 deraadt 76:
1.45 markus 77: #include "ssh.h"
78: #include "ssh1.h"
79: #include "ssh2.h"
1.1 deraadt 80: #include "xmalloc.h"
81: #include "packet.h"
82: #include "buffer.h"
1.15 markus 83: #include "compat.h"
1.74 markus 84: #include "channels.h"
1.15 markus 85: #include "dispatch.h"
1.30 markus 86: #include "buffer.h"
87: #include "bufaux.h"
1.40 markus 88: #include "key.h"
1.54 markus 89: #include "kex.h"
1.45 markus 90: #include "log.h"
91: #include "readconf.h"
92: #include "clientloop.h"
1.147 djm 93: #include "sshconnect.h"
1.40 markus 94: #include "authfd.h"
1.45 markus 95: #include "atomicio.h"
1.118 deraadt 96: #include "sshpty.h"
1.63 markus 97: #include "misc.h"
1.123 djm 98: #include "monitor_fdpass.h"
99: #include "match.h"
100: #include "msg.h"
1.39 markus 101:
102: /* import options */
103: extern Options options;
104:
1.1 deraadt 105: /* Flag indicating that stdin should be redirected from /dev/null. */
106: extern int stdin_null_flag;
107:
1.116 dtucker 108: /* Flag indicating that no shell has been requested */
109: extern int no_shell_flag;
110:
1.123 djm 111: /* Control socket */
112: extern int control_fd;
113:
1.13 markus 114: /*
115: * Name of the host we are connecting to. This is the name given on the
116: * command line, or the HostName specified for the user-supplied name in a
117: * configuration file.
118: */
1.1 deraadt 119: extern char *host;
120:
1.13 markus 121: /*
122: * Flag to indicate that we have received a window change signal which has
123: * not yet been processed. This will cause a message indicating the new
124: * window size to be sent to the server a little later. This is volatile
125: * because this is updated in a signal handler.
126: */
1.88 markus 127: static volatile sig_atomic_t received_window_change_signal = 0;
128: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 129:
1.145 djm 130: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 131: static int in_non_blocking_mode = 0;
132:
133: /* Common data for the client loop code. */
1.162 djm 134: static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.31 markus 135: static int escape_char; /* Escape character. */
1.11 markus 136: static int escape_pending; /* Last character was the escape character */
137: static int last_was_cr; /* Last character was a newline. */
138: static int exit_status; /* Used to store the exit status of the command. */
139: static int stdin_eof; /* EOF has been encountered on standard error. */
140: static Buffer stdin_buffer; /* Buffer for stdin data. */
141: static Buffer stdout_buffer; /* Buffer for stdout data. */
142: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 143: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
144: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 145: static int connection_in; /* Connection to server (input). */
146: static int connection_out; /* Connection to server (output). */
1.56 markus 147: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 148: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 149: static int server_alive_timeouts = 0;
1.1 deraadt 150:
1.77 itojun 151: static void client_init_dispatch(void);
1.16 markus 152: int session_ident = -1;
153:
1.123 djm 154: struct confirm_ctx {
155: int want_tty;
156: int want_subsys;
1.140 djm 157: int want_x_fwd;
158: int want_agent_fwd;
1.123 djm 159: Buffer cmd;
160: char *term;
161: struct termios tio;
1.126 djm 162: char **env;
1.123 djm 163: };
164:
1.54 markus 165: /*XXX*/
166: extern Kex *xxx_kex;
167:
1.123 djm 168: void ssh_process_session2_setup(int, int, int, Buffer *);
169:
1.1 deraadt 170: /* Restores stdin to blocking mode. */
171:
1.77 itojun 172: static void
1.49 itojun 173: leave_non_blocking(void)
1.1 deraadt 174: {
1.11 markus 175: if (in_non_blocking_mode) {
1.125 djm 176: unset_nonblock(fileno(stdin));
1.11 markus 177: in_non_blocking_mode = 0;
178: }
1.1 deraadt 179: }
180:
1.11 markus 181: /* Puts stdin terminal in non-blocking mode. */
182:
1.77 itojun 183: static void
1.49 itojun 184: enter_non_blocking(void)
1.1 deraadt 185: {
1.11 markus 186: in_non_blocking_mode = 1;
1.124 djm 187: set_nonblock(fileno(stdin));
1.1 deraadt 188: }
189:
1.13 markus 190: /*
191: * Signal handler for the window change signal (SIGWINCH). This just sets a
192: * flag indicating that the window has changed.
193: */
1.157 deraadt 194: /*ARGSUSED */
1.77 itojun 195: static void
1.11 markus 196: window_change_handler(int sig)
1.1 deraadt 197: {
1.11 markus 198: received_window_change_signal = 1;
199: signal(SIGWINCH, window_change_handler);
1.1 deraadt 200: }
201:
1.13 markus 202: /*
203: * Signal handler for signals that cause the program to terminate. These
204: * signals must be trapped to restore terminal modes.
205: */
1.157 deraadt 206: /*ARGSUSED */
1.77 itojun 207: static void
1.11 markus 208: signal_handler(int sig)
1.1 deraadt 209: {
1.75 markus 210: received_signal = sig;
211: quit_pending = 1;
1.1 deraadt 212: }
213:
1.13 markus 214: /*
215: * Returns current time in seconds from Jan 1, 1970 with the maximum
216: * available resolution.
217: */
1.1 deraadt 218:
1.77 itojun 219: static double
1.49 itojun 220: get_current_time(void)
1.1 deraadt 221: {
1.11 markus 222: struct timeval tv;
223: gettimeofday(&tv, NULL);
224: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 225: }
226:
227: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
228: void
229: client_x11_get_proto(const char *display, const char *xauth_path,
230: u_int trusted, char **_proto, char **_data)
231: {
232: char cmd[1024];
233: char line[512];
234: char xdisplay[512];
235: static char proto[512], data[512];
236: FILE *f;
237: int got_data = 0, generated = 0, do_unlink = 0, i;
238: char *xauthdir, *xauthfile;
239: struct stat st;
240:
241: xauthdir = xauthfile = NULL;
242: *_proto = proto;
243: *_data = data;
244: proto[0] = data[0] = '\0';
245:
246: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
247: debug("No xauth program.");
248: } else {
249: if (display == NULL) {
250: debug("x11_get_proto: DISPLAY not set");
251: return;
252: }
253: /*
254: * Handle FamilyLocal case where $DISPLAY does
255: * not match an authorization entry. For this we
256: * just try "xauth list unix:displaynum.screennum".
257: * XXX: "localhost" match to determine FamilyLocal
258: * is not perfect.
259: */
260: if (strncmp(display, "localhost:", 10) == 0) {
261: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
262: display + 10);
263: display = xdisplay;
264: }
265: if (trusted == 0) {
266: xauthdir = xmalloc(MAXPATHLEN);
267: xauthfile = xmalloc(MAXPATHLEN);
268: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
269: if (mkdtemp(xauthdir) != NULL) {
270: do_unlink = 1;
271: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
272: xauthdir);
273: snprintf(cmd, sizeof(cmd),
274: "%s -f %s generate %s " SSH_X11_PROTO
275: " untrusted timeout 1200 2>" _PATH_DEVNULL,
276: xauth_path, xauthfile, display);
277: debug2("x11_get_proto: %s", cmd);
278: if (system(cmd) == 0)
279: generated = 1;
280: }
281: }
282: snprintf(cmd, sizeof(cmd),
1.142 markus 283: "%s %s%s list %s 2>" _PATH_DEVNULL,
1.138 djm 284: xauth_path,
285: generated ? "-f " : "" ,
286: generated ? xauthfile : "",
287: display);
288: debug2("x11_get_proto: %s", cmd);
289: f = popen(cmd, "r");
290: if (f && fgets(line, sizeof(line), f) &&
291: sscanf(line, "%*s %511s %511s", proto, data) == 2)
292: got_data = 1;
293: if (f)
294: pclose(f);
295: }
296:
297: if (do_unlink) {
298: unlink(xauthfile);
299: rmdir(xauthdir);
300: }
301: if (xauthdir)
302: xfree(xauthdir);
303: if (xauthfile)
304: xfree(xauthfile);
305:
306: /*
307: * If we didn't get authentication data, just make up some
308: * data. The forwarding code will check the validity of the
309: * response anyway, and substitute this data. The X11
310: * server, however, will ignore this fake data and use
311: * whatever authentication mechanisms it was using otherwise
312: * for the local connection.
313: */
314: if (!got_data) {
315: u_int32_t rnd = 0;
316:
317: logit("Warning: No xauth data; "
318: "using fake authentication data for X11 forwarding.");
319: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
320: for (i = 0; i < 16; i++) {
321: if (i % 4 == 0)
322: rnd = arc4random();
323: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
324: rnd & 0xff);
325: rnd >>= 8;
326: }
327: }
1.1 deraadt 328: }
329:
1.13 markus 330: /*
331: * This is called when the interactive is entered. This checks if there is
332: * an EOF coming on stdin. We must check this explicitly, as select() does
333: * not appear to wake up when redirecting from /dev/null.
334: */
1.1 deraadt 335:
1.77 itojun 336: static void
1.49 itojun 337: client_check_initial_eof_on_stdin(void)
1.1 deraadt 338: {
1.11 markus 339: int len;
340: char buf[1];
1.1 deraadt 341:
1.13 markus 342: /*
343: * If standard input is to be "redirected from /dev/null", we simply
344: * mark that we have seen an EOF and send an EOF message to the
345: * server. Otherwise, we try to read a single character; it appears
346: * that for some files, such /dev/null, select() never wakes up for
347: * read for this descriptor, which means that we never get EOF. This
348: * way we will get the EOF if stdin comes from /dev/null or similar.
349: */
1.11 markus 350: if (stdin_null_flag) {
351: /* Fake EOF on stdin. */
352: debug("Sending eof.");
353: stdin_eof = 1;
354: packet_start(SSH_CMSG_EOF);
355: packet_send();
356: } else {
357: enter_non_blocking();
358:
359: /* Check for immediate EOF on stdin. */
360: len = read(fileno(stdin), buf, 1);
361: if (len == 0) {
1.13 markus 362: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 363: debug("Sending eof.");
364: stdin_eof = 1;
365: packet_start(SSH_CMSG_EOF);
366: packet_send();
367: } else if (len > 0) {
1.13 markus 368: /*
369: * Got data. We must store the data in the buffer,
370: * and also process it as an escape character if
371: * appropriate.
372: */
1.42 markus 373: if ((u_char) buf[0] == escape_char)
1.11 markus 374: escape_pending = 1;
1.52 markus 375: else
1.11 markus 376: buffer_append(&stdin_buffer, buf, 1);
377: }
378: leave_non_blocking();
379: }
1.1 deraadt 380: }
381:
382:
1.13 markus 383: /*
384: * Make packets from buffered stdin data, and buffer them for sending to the
385: * connection.
386: */
1.1 deraadt 387:
1.77 itojun 388: static void
1.49 itojun 389: client_make_packets_from_stdin_data(void)
1.1 deraadt 390: {
1.42 markus 391: u_int len;
1.1 deraadt 392:
1.11 markus 393: /* Send buffered stdin data to the server. */
394: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 395: packet_not_very_much_data_to_write()) {
1.11 markus 396: len = buffer_len(&stdin_buffer);
397: /* Keep the packets at reasonable size. */
398: if (len > packet_get_maxsize())
399: len = packet_get_maxsize();
400: packet_start(SSH_CMSG_STDIN_DATA);
401: packet_put_string(buffer_ptr(&stdin_buffer), len);
402: packet_send();
403: buffer_consume(&stdin_buffer, len);
1.52 markus 404: stdin_bytes += len;
1.11 markus 405: /* If we have a pending EOF, send it now. */
406: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
407: packet_start(SSH_CMSG_EOF);
408: packet_send();
409: }
1.1 deraadt 410: }
411: }
412:
1.13 markus 413: /*
414: * Checks if the client window has changed, and sends a packet about it to
415: * the server if so. The actual change is detected elsewhere (by a software
416: * interrupt on Unix); this just checks the flag and sends a message if
417: * appropriate.
418: */
1.1 deraadt 419:
1.77 itojun 420: static void
1.49 itojun 421: client_check_window_change(void)
1.1 deraadt 422: {
1.16 markus 423: struct winsize ws;
424:
425: if (! received_window_change_signal)
426: return;
427: /** XXX race */
428: received_window_change_signal = 0;
429:
1.37 markus 430: debug2("client_check_window_change: changed");
1.16 markus 431:
432: if (compat20) {
1.123 djm 433: channel_send_window_changes();
1.16 markus 434: } else {
1.123 djm 435: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
436: return;
1.16 markus 437: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 438: packet_put_int((u_int)ws.ws_row);
439: packet_put_int((u_int)ws.ws_col);
440: packet_put_int((u_int)ws.ws_xpixel);
441: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 442: packet_send();
1.1 deraadt 443: }
444: }
445:
1.117 markus 446: static void
447: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
448: {
449: server_alive_timeouts = 0;
450: client_global_request_reply_fwd(type, seq, ctxt);
451: }
452:
453: static void
454: server_alive_check(void)
455: {
456: if (++server_alive_timeouts > options.server_alive_count_max)
457: packet_disconnect("Timeout, server not responding.");
458: packet_start(SSH2_MSG_GLOBAL_REQUEST);
459: packet_put_cstring("keepalive@openssh.com");
460: packet_put_char(1); /* boolean: want reply */
461: packet_send();
462: }
463:
1.13 markus 464: /*
465: * Waits until the client can do something (some data becomes available on
466: * one of the file descriptors).
467: */
1.77 itojun 468: static void
1.46 markus 469: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 470: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 471: {
1.117 markus 472: struct timeval tv, *tvp;
473: int ret;
474:
1.46 markus 475: /* Add any selections by the channel mechanism. */
1.81 markus 476: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 477:
1.16 markus 478: if (!compat20) {
1.17 markus 479: /* Read from the connection, unless our buffers are full. */
1.16 markus 480: if (buffer_len(&stdout_buffer) < buffer_high &&
481: buffer_len(&stderr_buffer) < buffer_high &&
482: channel_not_very_much_buffered_data())
1.46 markus 483: FD_SET(connection_in, *readsetp);
1.17 markus 484: /*
485: * Read from stdin, unless we have seen EOF or have very much
486: * buffered data to send to the server.
487: */
488: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 489: FD_SET(fileno(stdin), *readsetp);
1.17 markus 490:
491: /* Select stdout/stderr if have data in buffer. */
492: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 493: FD_SET(fileno(stdout), *writesetp);
1.17 markus 494: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 495: FD_SET(fileno(stderr), *writesetp);
1.16 markus 496: } else {
1.71 markus 497: /* channel_prepare_select could have closed the last channel */
1.84 markus 498: if (session_closed && !channel_still_open() &&
499: !packet_have_data_to_write()) {
500: /* clear mask since we did not call select() */
1.87 markus 501: memset(*readsetp, 0, *nallocp);
502: memset(*writesetp, 0, *nallocp);
1.84 markus 503: return;
1.71 markus 504: } else {
505: FD_SET(connection_in, *readsetp);
506: }
1.16 markus 507: }
1.11 markus 508:
509: /* Select server connection if have data to write to the server. */
510: if (packet_have_data_to_write())
1.46 markus 511: FD_SET(connection_out, *writesetp);
1.11 markus 512:
1.123 djm 513: if (control_fd != -1)
514: FD_SET(control_fd, *readsetp);
515:
1.13 markus 516: /*
517: * Wait for something to happen. This will suspend the process until
518: * some selected descriptor can be read, written, or has some other
1.117 markus 519: * event pending.
1.13 markus 520: */
1.11 markus 521:
1.117 markus 522: if (options.server_alive_interval == 0 || !compat20)
523: tvp = NULL;
1.129 deraadt 524: else {
1.117 markus 525: tv.tv_sec = options.server_alive_interval;
526: tv.tv_usec = 0;
527: tvp = &tv;
528: }
529: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
530: if (ret < 0) {
1.11 markus 531: char buf[100];
1.51 markus 532:
533: /*
534: * We have to clear the select masks, because we return.
535: * We have to return, because the mainloop checks for the flags
536: * set by the signal handlers.
537: */
1.87 markus 538: memset(*readsetp, 0, *nallocp);
539: memset(*writesetp, 0, *nallocp);
1.50 deraadt 540:
1.11 markus 541: if (errno == EINTR)
542: return;
543: /* Note: we might still have data in the buffers. */
544: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
545: buffer_append(&stderr_buffer, buf, strlen(buf));
546: quit_pending = 1;
1.117 markus 547: } else if (ret == 0)
548: server_alive_check();
1.11 markus 549: }
550:
1.77 itojun 551: static void
1.31 markus 552: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 553: {
1.11 markus 554: /* Flush stdout and stderr buffers. */
1.31 markus 555: if (buffer_len(bout) > 0)
1.112 deraadt 556: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 557: if (buffer_len(berr) > 0)
1.112 deraadt 558: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 559:
560: leave_raw_mode();
561:
1.13 markus 562: /*
563: * Free (and clear) the buffer to reduce the amount of data that gets
564: * written to swap.
565: */
1.31 markus 566: buffer_free(bin);
567: buffer_free(bout);
568: buffer_free(berr);
1.11 markus 569:
570: /* Send the suspend signal to the program itself. */
571: kill(getpid(), SIGTSTP);
572:
1.132 djm 573: /* Reset window sizes in case they have changed */
574: received_window_change_signal = 1;
1.11 markus 575:
576: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 577: buffer_init(bin);
578: buffer_init(bout);
579: buffer_init(berr);
1.11 markus 580:
581: enter_raw_mode();
582: }
583:
1.77 itojun 584: static void
1.161 deraadt 585: client_process_net_input(fd_set *readset)
1.11 markus 586: {
1.17 markus 587: int len;
588: char buf[8192];
1.11 markus 589:
1.13 markus 590: /*
591: * Read input from the server, and add any such data to the buffer of
592: * the packet subsystem.
593: */
1.11 markus 594: if (FD_ISSET(connection_in, readset)) {
595: /* Read as much as possible. */
596: len = read(connection_in, buf, sizeof(buf));
597: if (len == 0) {
598: /* Received EOF. The remote host has closed the connection. */
599: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
600: host);
1.1 deraadt 601: buffer_append(&stderr_buffer, buf, strlen(buf));
602: quit_pending = 1;
603: return;
1.11 markus 604: }
1.13 markus 605: /*
606: * There is a kernel bug on Solaris that causes select to
607: * sometimes wake up even though there is no data available.
608: */
1.53 millert 609: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 610: len = 0;
611:
612: if (len < 0) {
613: /* An error has encountered. Perhaps there is a network problem. */
614: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
615: host, strerror(errno));
616: buffer_append(&stderr_buffer, buf, strlen(buf));
617: quit_pending = 1;
618: return;
619: }
620: packet_process_incoming(buf, len);
621: }
1.17 markus 622: }
1.16 markus 623:
1.97 jakob 624: static void
1.123 djm 625: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
626: {
627: int id;
628: Channel *c;
1.129 deraadt 629:
1.123 djm 630: id = packet_get_int();
631: packet_check_eom();
632:
633: if ((c = channel_lookup(id)) == NULL) {
634: error("%s: no channel for id %d", __func__, id);
635: return;
636: }
637:
638: if (type == SSH2_MSG_CHANNEL_SUCCESS)
639: debug2("Request suceeded on channel %d", id);
640: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
641: error("Request failed on channel %d", id);
642: channel_free(c);
643: }
644: }
645:
646: static void
647: client_extra_session2_setup(int id, void *arg)
648: {
649: struct confirm_ctx *cctx = arg;
1.140 djm 650: const char *display;
1.123 djm 651: Channel *c;
1.126 djm 652: int i;
1.129 deraadt 653:
1.123 djm 654: if (cctx == NULL)
655: fatal("%s: cctx == NULL", __func__);
656: if ((c = channel_lookup(id)) == NULL)
657: fatal("%s: no channel for id %d", __func__, id);
658:
1.141 djm 659: display = getenv("DISPLAY");
1.140 djm 660: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
661: char *proto, *data;
662: /* Get reasonable local authentication information. */
663: client_x11_get_proto(display, options.xauth_location,
664: options.forward_x11_trusted, &proto, &data);
665: /* Request forwarding with authentication spoofing. */
666: debug("Requesting X11 forwarding with authentication spoofing.");
667: x11_request_forwarding_with_spoofing(id, display, proto, data);
668: /* XXX wait for reply */
669: }
670:
671: if (cctx->want_agent_fwd && options.forward_agent) {
672: debug("Requesting authentication agent forwarding.");
673: channel_request_start(id, "auth-agent-req@openssh.com", 0);
674: packet_send();
675: }
676:
1.129 deraadt 677: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 678: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 679: client_subsystem_reply);
1.127 djm 680:
1.123 djm 681: c->confirm_ctx = NULL;
682: buffer_free(&cctx->cmd);
1.126 djm 683: xfree(cctx->term);
684: if (cctx->env != NULL) {
685: for (i = 0; cctx->env[i] != NULL; i++)
686: xfree(cctx->env[i]);
687: xfree(cctx->env);
1.129 deraadt 688: }
1.126 djm 689: xfree(cctx);
1.123 djm 690: }
691:
692: static void
1.161 deraadt 693: client_process_control(fd_set *readset)
1.123 djm 694: {
695: Buffer m;
696: Channel *c;
1.139 djm 697: int client_fd, new_fd[3], ver, allowed;
1.123 djm 698: socklen_t addrlen;
699: struct sockaddr_storage addr;
700: struct confirm_ctx *cctx;
701: char *cmd;
1.139 djm 702: u_int i, len, env_len, command, flags;
1.123 djm 703: uid_t euid;
704: gid_t egid;
705:
706: /*
707: * Accept connection on control socket
708: */
709: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
710: return;
711:
712: memset(&addr, 0, sizeof(addr));
713: addrlen = sizeof(addr);
714: if ((client_fd = accept(control_fd,
715: (struct sockaddr*)&addr, &addrlen)) == -1) {
716: error("%s accept: %s", __func__, strerror(errno));
717: return;
718: }
719:
720: if (getpeereid(client_fd, &euid, &egid) < 0) {
721: error("%s getpeereid failed: %s", __func__, strerror(errno));
722: close(client_fd);
723: return;
724: }
725: if ((euid != 0) && (getuid() != euid)) {
726: error("control mode uid mismatch: peer euid %u != uid %u",
727: (u_int) euid, (u_int) getuid());
728: close(client_fd);
729: return;
730: }
1.127 djm 731:
1.134 djm 732: unset_nonblock(client_fd);
733:
734: /* Read command */
735: buffer_init(&m);
736: if (ssh_msg_recv(client_fd, &m) == -1) {
737: error("%s: client msg_recv failed", __func__);
738: close(client_fd);
739: buffer_free(&m);
740: return;
741: }
1.140 djm 742: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 743: error("%s: wrong client version %d", __func__, ver);
744: buffer_free(&m);
745: close(client_fd);
746: return;
747: }
748:
1.127 djm 749: allowed = 1;
1.134 djm 750: command = buffer_get_int(&m);
751: flags = buffer_get_int(&m);
1.123 djm 752:
1.134 djm 753: buffer_clear(&m);
1.123 djm 754:
1.134 djm 755: switch (command) {
756: case SSHMUX_COMMAND_OPEN:
1.137 djm 757: if (options.control_master == SSHCTL_MASTER_ASK ||
758: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 759: allowed = ask_permission("Allow shared connection "
760: "to %s? ", host);
761: /* continue below */
762: break;
763: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 764: if (options.control_master == SSHCTL_MASTER_ASK ||
765: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 766: allowed = ask_permission("Terminate shared connection "
767: "to %s? ", host);
768: if (allowed)
769: quit_pending = 1;
1.136 deraadt 770: /* FALLTHROUGH */
1.134 djm 771: case SSHMUX_COMMAND_ALIVE_CHECK:
772: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
773: buffer_clear(&m);
774: buffer_put_int(&m, allowed);
775: buffer_put_int(&m, getpid());
1.140 djm 776: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 777: error("%s: client msg_send failed", __func__);
778: close(client_fd);
779: buffer_free(&m);
780: return;
781: }
782: buffer_free(&m);
783: close(client_fd);
784: return;
785: default:
786: error("Unsupported command %d", command);
787: buffer_free(&m);
788: close(client_fd);
789: return;
790: }
1.123 djm 791:
1.134 djm 792: /* Reply for SSHMUX_COMMAND_OPEN */
793: buffer_clear(&m);
1.127 djm 794: buffer_put_int(&m, allowed);
1.123 djm 795: buffer_put_int(&m, getpid());
1.140 djm 796: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 797: error("%s: client msg_send failed", __func__);
798: close(client_fd);
1.127 djm 799: buffer_free(&m);
1.123 djm 800: return;
801: }
802:
1.127 djm 803: if (!allowed) {
804: error("Refused control connection");
805: close(client_fd);
806: buffer_free(&m);
807: return;
808: }
809:
1.134 djm 810: buffer_clear(&m);
1.123 djm 811: if (ssh_msg_recv(client_fd, &m) == -1) {
812: error("%s: client msg_recv failed", __func__);
813: close(client_fd);
1.127 djm 814: buffer_free(&m);
1.123 djm 815: return;
816: }
1.140 djm 817: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 818: error("%s: wrong client version %d", __func__, ver);
819: buffer_free(&m);
820: close(client_fd);
821: return;
822: }
823:
1.159 djm 824: cctx = xcalloc(1, sizeof(*cctx));
1.134 djm 825: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
826: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 827: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
828: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 829: cctx->term = buffer_get_string(&m, &len);
830:
831: cmd = buffer_get_string(&m, &len);
832: buffer_init(&cctx->cmd);
833: buffer_append(&cctx->cmd, cmd, strlen(cmd));
834:
1.126 djm 835: env_len = buffer_get_int(&m);
836: env_len = MIN(env_len, 4096);
837: debug3("%s: receiving %d env vars", __func__, env_len);
838: if (env_len != 0) {
1.159 djm 839: cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
1.126 djm 840: for (i = 0; i < env_len; i++)
841: cctx->env[i] = buffer_get_string(&m, &len);
842: cctx->env[i] = NULL;
843: }
844:
1.123 djm 845: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
846: cctx->want_tty, cctx->want_subsys, cmd);
1.163 markus 847: xfree(cmd);
1.123 djm 848:
849: /* Gather fds from client */
850: new_fd[0] = mm_receive_fd(client_fd);
851: new_fd[1] = mm_receive_fd(client_fd);
852: new_fd[2] = mm_receive_fd(client_fd);
853:
854: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
855: new_fd[0], new_fd[1], new_fd[2]);
856:
857: /* Try to pick up ttymodes from client before it goes raw */
858: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
859: error("%s: tcgetattr: %s", __func__, strerror(errno));
860:
1.134 djm 861: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 862: buffer_clear(&m);
1.140 djm 863: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 864: error("%s: client msg_send failed", __func__);
865: close(client_fd);
866: close(new_fd[0]);
867: close(new_fd[1]);
868: close(new_fd[2]);
1.127 djm 869: buffer_free(&m);
1.134 djm 870: xfree(cctx->term);
871: if (env_len != 0) {
872: for (i = 0; i < env_len; i++)
873: xfree(cctx->env[i]);
874: xfree(cctx->env);
875: }
1.123 djm 876: return;
877: }
878: buffer_free(&m);
879:
880: /* enable nonblocking unless tty */
881: if (!isatty(new_fd[0]))
882: set_nonblock(new_fd[0]);
883: if (!isatty(new_fd[1]))
884: set_nonblock(new_fd[1]);
885: if (!isatty(new_fd[2]))
886: set_nonblock(new_fd[2]);
887:
888: set_nonblock(client_fd);
889:
1.129 deraadt 890: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 891: new_fd[0], new_fd[1], new_fd[2],
892: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
893: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
894:
895: /* XXX */
896: c->ctl_fd = client_fd;
897:
898: debug3("%s: channel_new: %d", __func__, c->self);
899:
900: channel_send_open(c->self);
901: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
902: }
903:
904: static void
1.99 markus 905: process_cmdline(void)
1.97 jakob 906: {
907: void (*handler)(int);
1.135 djm 908: char *s, *cmd, *cancel_host;
1.121 djm 909: int delete = 0;
1.97 jakob 910: int local = 0;
1.135 djm 911: u_short cancel_port;
912: Forward fwd;
1.97 jakob 913:
914: leave_raw_mode();
1.101 markus 915: handler = signal(SIGINT, SIG_IGN);
1.99 markus 916: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 917: if (s == NULL)
918: goto out;
919: while (*s && isspace(*s))
920: s++;
1.121 djm 921: if (*s == '-')
922: s++; /* Skip cmdline '-', if any */
1.120 dtucker 923: if (*s == '\0')
1.97 jakob 924: goto out;
1.121 djm 925:
1.122 djm 926: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 927: logit("Commands:");
1.164 djm 928: logit(" -L[bind_address:]port:host:hostport "
929: "Request local forward");
930: logit(" -R[bind_address:]port:host:hostport "
931: "Request remote forward");
1.165 stevesk 932: logit(" -KR[bind_address:]port "
1.164 djm 933: "Cancel remote forward");
1.146 reyk 934: if (!options.permit_local_command)
935: goto out;
1.164 djm 936: logit(" !args "
937: "Execute local command");
1.146 reyk 938: goto out;
939: }
940:
941: if (*s == '!' && options.permit_local_command) {
942: s++;
943: ssh_local_cmd(s);
1.121 djm 944: goto out;
945: }
946:
947: if (*s == 'K') {
948: delete = 1;
949: s++;
950: }
951: if (*s != 'L' && *s != 'R') {
1.109 itojun 952: logit("Invalid command.");
1.97 jakob 953: goto out;
954: }
1.121 djm 955: if (*s == 'L')
1.97 jakob 956: local = 1;
1.121 djm 957: if (local && delete) {
958: logit("Not supported.");
959: goto out;
960: }
961: if ((!local || delete) && !compat20) {
1.109 itojun 962: logit("Not supported for SSH protocol version 1.");
1.97 jakob 963: goto out;
964: }
1.121 djm 965:
966: s++;
1.97 jakob 967: while (*s && isspace(*s))
968: s++;
969:
1.121 djm 970: if (delete) {
1.135 djm 971: cancel_port = 0;
972: cancel_host = hpdelim(&s); /* may be NULL */
973: if (s != NULL) {
974: cancel_port = a2port(s);
975: cancel_host = cleanhostname(cancel_host);
976: } else {
977: cancel_port = a2port(cancel_host);
978: cancel_host = NULL;
1.121 djm 979: }
1.135 djm 980: if (cancel_port == 0) {
981: logit("Bad forwarding close port");
1.121 djm 982: goto out;
983: }
1.135 djm 984: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 985: } else {
1.135 djm 986: if (!parse_forward(&fwd, s)) {
1.121 djm 987: logit("Bad forwarding specification.");
988: goto out;
989: }
990: if (local) {
1.135 djm 991: if (channel_setup_local_fwd_listener(fwd.listen_host,
992: fwd.listen_port, fwd.connect_host,
993: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 994: logit("Port forwarding failed.");
995: goto out;
996: }
1.135 djm 997: } else {
1.167 markus 998: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 999: fwd.listen_port, fwd.connect_host,
1.167 markus 1000: fwd.connect_port) < 0) {
1001: logit("Port forwarding failed.");
1002: goto out;
1003: }
1.135 djm 1004: }
1005:
1.121 djm 1006: logit("Forwarding port.");
1007: }
1008:
1.97 jakob 1009: out:
1010: signal(SIGINT, handler);
1011: enter_raw_mode();
1012: if (cmd)
1013: xfree(cmd);
1014: }
1015:
1.31 markus 1016: /* process the characters one by one */
1.77 itojun 1017: static int
1.31 markus 1018: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1019: {
1.32 markus 1020: char string[1024];
1.31 markus 1021: pid_t pid;
1022: int bytes = 0;
1.42 markus 1023: u_int i;
1024: u_char ch;
1.31 markus 1025: char *s;
1026:
1.139 djm 1027: if (len <= 0)
1028: return (0);
1029:
1030: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1031: /* Get one character at a time. */
1032: ch = buf[i];
1033:
1034: if (escape_pending) {
1035: /* We have previously seen an escape character. */
1036: /* Clear the flag now. */
1037: escape_pending = 0;
1038:
1039: /* Process the escaped character. */
1040: switch (ch) {
1041: case '.':
1042: /* Terminate the connection. */
1.32 markus 1043: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1044: buffer_append(berr, string, strlen(string));
1.31 markus 1045:
1046: quit_pending = 1;
1047: return -1;
1048:
1049: case 'Z' - 64:
1050: /* Suspend the program. */
1051: /* Print a message to that effect to the user. */
1.32 markus 1052: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1053: buffer_append(berr, string, strlen(string));
1.31 markus 1054:
1055: /* Restore terminal modes and suspend. */
1056: client_suspend_self(bin, bout, berr);
1057:
1058: /* We have been continued. */
1059: continue;
1060:
1.111 markus 1061: case 'B':
1062: if (compat20) {
1063: snprintf(string, sizeof string,
1064: "%cB\r\n", escape_char);
1065: buffer_append(berr, string,
1066: strlen(string));
1067: channel_request_start(session_ident,
1068: "break", 0);
1069: packet_put_int(1000);
1070: packet_send();
1071: }
1072: continue;
1073:
1.54 markus 1074: case 'R':
1.59 markus 1075: if (compat20) {
1076: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1077: logit("Server does not support re-keying");
1.59 markus 1078: else
1079: need_rekeying = 1;
1080: }
1.54 markus 1081: continue;
1082:
1.31 markus 1083: case '&':
1084: /*
1085: * Detach the program (continue to serve connections,
1086: * but put in background and no more new connections).
1087: */
1088: /* Restore tty modes. */
1089: leave_raw_mode();
1090:
1091: /* Stop listening for new connections. */
1.86 markus 1092: channel_stop_listening();
1.31 markus 1093:
1.86 markus 1094: snprintf(string, sizeof string,
1095: "%c& [backgrounded]\n", escape_char);
1096: buffer_append(berr, string, strlen(string));
1.31 markus 1097:
1098: /* Fork into background. */
1099: pid = fork();
1100: if (pid < 0) {
1101: error("fork: %.100s", strerror(errno));
1102: continue;
1103: }
1104: if (pid != 0) { /* This is the parent. */
1105: /* The parent just exits. */
1106: exit(0);
1107: }
1108: /* The child continues serving connections. */
1.86 markus 1109: if (compat20) {
1110: buffer_append(bin, "\004", 1);
1111: /* fake EOF on stdin */
1112: return -1;
1113: } else if (!stdin_eof) {
1114: /*
1115: * Sending SSH_CMSG_EOF alone does not always appear
1116: * to be enough. So we try to send an EOF character
1117: * first.
1118: */
1119: packet_start(SSH_CMSG_STDIN_DATA);
1120: packet_put_string("\004", 1);
1121: packet_send();
1122: /* Close stdin. */
1123: stdin_eof = 1;
1124: if (buffer_len(bin) == 0) {
1125: packet_start(SSH_CMSG_EOF);
1126: packet_send();
1127: }
1128: }
1129: continue;
1.31 markus 1130:
1131: case '?':
1.32 markus 1132: snprintf(string, sizeof string,
1.31 markus 1133: "%c?\r\n\
1134: Supported escape sequences:\r\n\
1.104 stevesk 1135: %c. - terminate connection\r\n\
1.111 markus 1136: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1137: %cC - open a command line\r\n\
1138: %cR - Request rekey (SSH protocol 2 only)\r\n\
1139: %c^Z - suspend ssh\r\n\
1140: %c# - list forwarded connections\r\n\
1141: %c& - background ssh (when waiting for connections to terminate)\r\n\
1142: %c? - this message\r\n\
1143: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1144: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1145: escape_char, escape_char, escape_char, escape_char,
1146: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1147: escape_char, escape_char, escape_char);
1.32 markus 1148: buffer_append(berr, string, strlen(string));
1.31 markus 1149: continue;
1150:
1151: case '#':
1.32 markus 1152: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1153: buffer_append(berr, string, strlen(string));
1.31 markus 1154: s = channel_open_message();
1155: buffer_append(berr, s, strlen(s));
1156: xfree(s);
1.97 jakob 1157: continue;
1158:
1159: case 'C':
1.99 markus 1160: process_cmdline();
1.31 markus 1161: continue;
1162:
1163: default:
1164: if (ch != escape_char) {
1165: buffer_put_char(bin, escape_char);
1166: bytes++;
1167: }
1168: /* Escaped characters fall through here */
1169: break;
1170: }
1171: } else {
1172: /*
1173: * The previous character was not an escape char. Check if this
1174: * is an escape.
1175: */
1176: if (last_was_cr && ch == escape_char) {
1177: /* It is. Set the flag and continue to next character. */
1178: escape_pending = 1;
1179: continue;
1180: }
1181: }
1182:
1183: /*
1184: * Normal character. Record whether it was a newline,
1185: * and append it to the buffer.
1186: */
1187: last_was_cr = (ch == '\r' || ch == '\n');
1188: buffer_put_char(bin, ch);
1189: bytes++;
1190: }
1191: return bytes;
1192: }
1193:
1.77 itojun 1194: static void
1.161 deraadt 1195: client_process_input(fd_set *readset)
1.17 markus 1196: {
1.21 deraadt 1197: int len;
1.31 markus 1198: char buf[8192];
1.16 markus 1199:
1.11 markus 1200: /* Read input from stdin. */
1201: if (FD_ISSET(fileno(stdin), readset)) {
1202: /* Read as much as possible. */
1203: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1204: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1205: return; /* we'll try again later */
1.11 markus 1206: if (len <= 0) {
1.13 markus 1207: /*
1208: * Received EOF or error. They are treated
1209: * similarly, except that an error message is printed
1210: * if it was an error condition.
1211: */
1.11 markus 1212: if (len < 0) {
1213: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1214: buffer_append(&stderr_buffer, buf, strlen(buf));
1215: }
1216: /* Mark that we have seen EOF. */
1217: stdin_eof = 1;
1.13 markus 1218: /*
1219: * Send an EOF message to the server unless there is
1220: * data in the buffer. If there is data in the
1221: * buffer, no message will be sent now. Code
1222: * elsewhere will send the EOF when the buffer
1223: * becomes empty if stdin_eof is set.
1224: */
1.11 markus 1225: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1226: packet_start(SSH_CMSG_EOF);
1227: packet_send();
1.11 markus 1228: }
1.72 stevesk 1229: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1230: /*
1231: * Normal successful read, and no escape character.
1232: * Just append the data to buffer.
1233: */
1.11 markus 1234: buffer_append(&stdin_buffer, buf, len);
1235: } else {
1.13 markus 1236: /*
1237: * Normal, successful read. But we have an escape character
1238: * and have to process the characters one by one.
1239: */
1.52 markus 1240: if (process_escapes(&stdin_buffer, &stdout_buffer,
1241: &stderr_buffer, buf, len) == -1)
1.31 markus 1242: return;
1.11 markus 1243: }
1244: }
1245: }
1246:
1.77 itojun 1247: static void
1.161 deraadt 1248: client_process_output(fd_set *writeset)
1.11 markus 1249: {
1250: int len;
1251: char buf[100];
1.1 deraadt 1252:
1.11 markus 1253: /* Write buffered output to stdout. */
1254: if (FD_ISSET(fileno(stdout), writeset)) {
1255: /* Write as much data as possible. */
1256: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1257: buffer_len(&stdout_buffer));
1.11 markus 1258: if (len <= 0) {
1.64 markus 1259: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1260: len = 0;
1261: else {
1.13 markus 1262: /*
1263: * An error or EOF was encountered. Put an
1264: * error message to stderr buffer.
1265: */
1.11 markus 1266: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1267: buffer_append(&stderr_buffer, buf, strlen(buf));
1268: quit_pending = 1;
1269: return;
1270: }
1271: }
1272: /* Consume printed data from the buffer. */
1273: buffer_consume(&stdout_buffer, len);
1.57 markus 1274: stdout_bytes += len;
1.11 markus 1275: }
1276: /* Write buffered output to stderr. */
1277: if (FD_ISSET(fileno(stderr), writeset)) {
1278: /* Write as much data as possible. */
1279: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1280: buffer_len(&stderr_buffer));
1.11 markus 1281: if (len <= 0) {
1.64 markus 1282: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1283: len = 0;
1284: else {
1.13 markus 1285: /* EOF or error, but can't even print error message. */
1.11 markus 1286: quit_pending = 1;
1287: return;
1288: }
1289: }
1290: /* Consume printed characters from the buffer. */
1291: buffer_consume(&stderr_buffer, len);
1.57 markus 1292: stderr_bytes += len;
1.11 markus 1293: }
1.1 deraadt 1294: }
1295:
1.13 markus 1296: /*
1.15 markus 1297: * Get packets from the connection input buffer, and process them as long as
1298: * there are packets available.
1299: *
1300: * Any unknown packets received during the actual
1301: * session cause the session to terminate. This is
1302: * intended to make debugging easier since no
1303: * confirmations are sent. Any compatible protocol
1304: * extensions must be negotiated during the
1305: * preparatory phase.
1306: */
1307:
1.77 itojun 1308: static void
1.49 itojun 1309: client_process_buffered_input_packets(void)
1.15 markus 1310: {
1.54 markus 1311: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1312: }
1313:
1.31 markus 1314: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1315:
1.77 itojun 1316: static int
1.31 markus 1317: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1318: {
1.31 markus 1319: /* XXX we assume c->extended is writeable */
1320: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1321: }
1322:
1.77 itojun 1323: static void
1.60 markus 1324: client_channel_closed(int id, void *arg)
1325: {
1.83 markus 1326: channel_cancel_cleanup(id);
1.60 markus 1327: session_closed = 1;
1.113 markus 1328: leave_raw_mode();
1.60 markus 1329: }
1330:
1.15 markus 1331: /*
1.13 markus 1332: * Implements the interactive session with the server. This is called after
1333: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1334: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1335: * used as an escape character for terminating or suspending the session.
1.13 markus 1336: */
1.1 deraadt 1337:
1.20 markus 1338: int
1.30 markus 1339: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1340: {
1.46 markus 1341: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1342: double start_time, total_time;
1.130 avsm 1343: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1344: u_int nalloc = 0;
1.11 markus 1345: char buf[100];
1346:
1347: debug("Entering interactive session.");
1348:
1349: start_time = get_current_time();
1350:
1351: /* Initialize variables. */
1352: escape_pending = 0;
1353: last_was_cr = 1;
1354: exit_status = -1;
1355: stdin_eof = 0;
1356: buffer_high = 64 * 1024;
1357: connection_in = packet_get_connection_in();
1358: connection_out = packet_get_connection_out();
1.46 markus 1359: max_fd = MAX(connection_in, connection_out);
1.123 djm 1360: if (control_fd != -1)
1361: max_fd = MAX(max_fd, control_fd);
1.46 markus 1362:
1363: if (!compat20) {
1.63 markus 1364: /* enable nonblocking unless tty */
1365: if (!isatty(fileno(stdin)))
1366: set_nonblock(fileno(stdin));
1367: if (!isatty(fileno(stdout)))
1368: set_nonblock(fileno(stdout));
1369: if (!isatty(fileno(stderr)))
1370: set_nonblock(fileno(stderr));
1.46 markus 1371: max_fd = MAX(max_fd, fileno(stdin));
1372: max_fd = MAX(max_fd, fileno(stdout));
1373: max_fd = MAX(max_fd, fileno(stderr));
1374: }
1.11 markus 1375: stdin_bytes = 0;
1376: stdout_bytes = 0;
1377: stderr_bytes = 0;
1378: quit_pending = 0;
1379: escape_char = escape_char_arg;
1380:
1381: /* Initialize buffers. */
1382: buffer_init(&stdin_buffer);
1383: buffer_init(&stdout_buffer);
1384: buffer_init(&stderr_buffer);
1385:
1.15 markus 1386: client_init_dispatch();
1387:
1.105 markus 1388: /*
1389: * Set signal handlers, (e.g. to restore non-blocking mode)
1390: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1391: */
1.131 djm 1392: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1393: signal(SIGHUP, signal_handler);
1.105 markus 1394: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1395: signal(SIGINT, signal_handler);
1396: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1397: signal(SIGQUIT, signal_handler);
1398: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1399: signal(SIGTERM, signal_handler);
1.132 djm 1400: signal(SIGWINCH, window_change_handler);
1.11 markus 1401:
1402: if (have_pty)
1403: enter_raw_mode();
1404:
1.48 markus 1405: if (compat20) {
1406: session_ident = ssh2_chan_id;
1.72 stevesk 1407: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1408: channel_register_filter(session_ident,
1.149 reyk 1409: simple_escape_filter, NULL);
1.60 markus 1410: if (session_ident != -1)
1411: channel_register_cleanup(session_ident,
1.143 djm 1412: client_channel_closed, 0);
1.48 markus 1413: } else {
1414: /* Check if we should immediately send eof on stdin. */
1.16 markus 1415: client_check_initial_eof_on_stdin();
1.48 markus 1416: }
1.30 markus 1417:
1.11 markus 1418: /* Main loop of the client for the interactive session mode. */
1419: while (!quit_pending) {
1420:
1.13 markus 1421: /* Process buffered packets sent by the server. */
1.11 markus 1422: client_process_buffered_input_packets();
1423:
1.60 markus 1424: if (compat20 && session_closed && !channel_still_open())
1425: break;
1426:
1.56 markus 1427: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1428:
1.56 markus 1429: if (rekeying) {
1430: debug("rekeying in progress");
1431: } else {
1432: /*
1433: * Make packets of buffered stdin data, and buffer
1434: * them for sending to the server.
1435: */
1436: if (!compat20)
1437: client_make_packets_from_stdin_data();
1.11 markus 1438:
1.56 markus 1439: /*
1440: * Make packets from buffered channel data, and
1441: * enqueue them for sending to the server.
1442: */
1443: if (packet_not_very_much_data_to_write())
1444: channel_output_poll();
1.11 markus 1445:
1.56 markus 1446: /*
1447: * Check if the window size has changed, and buffer a
1448: * message about it to the server if so.
1449: */
1450: client_check_window_change();
1.11 markus 1451:
1.56 markus 1452: if (quit_pending)
1453: break;
1454: }
1.13 markus 1455: /*
1456: * Wait until we have something to do (something becomes
1457: * available on one of the descriptors).
1458: */
1.81 markus 1459: max_fd2 = max_fd;
1.56 markus 1460: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1461: &max_fd2, &nalloc, rekeying);
1.11 markus 1462:
1463: if (quit_pending)
1464: break;
1465:
1.56 markus 1466: /* Do channel operations unless rekeying in progress. */
1467: if (!rekeying) {
1468: channel_after_select(readset, writeset);
1.108 markus 1469: if (need_rekeying || packet_need_rekeying()) {
1470: debug("need rekeying");
1.56 markus 1471: xxx_kex->done = 0;
1472: kex_send_kexinit(xxx_kex);
1473: need_rekeying = 0;
1474: }
1475: }
1.11 markus 1476:
1.17 markus 1477: /* Buffer input from the connection. */
1.46 markus 1478: client_process_net_input(readset);
1.17 markus 1479:
1.123 djm 1480: /* Accept control connections. */
1481: client_process_control(readset);
1482:
1.17 markus 1483: if (quit_pending)
1484: break;
1.11 markus 1485:
1.17 markus 1486: if (!compat20) {
1487: /* Buffer data from stdin */
1.46 markus 1488: client_process_input(readset);
1.17 markus 1489: /*
1490: * Process output to stdout and stderr. Output to
1491: * the connection is processed elsewhere (above).
1492: */
1.46 markus 1493: client_process_output(writeset);
1.17 markus 1494: }
1.11 markus 1495:
1.13 markus 1496: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1497: if (FD_ISSET(connection_out, writeset))
1.11 markus 1498: packet_write_poll();
1499: }
1.46 markus 1500: if (readset)
1501: xfree(readset);
1502: if (writeset)
1503: xfree(writeset);
1.11 markus 1504:
1505: /* Terminate the session. */
1506:
1507: /* Stop watching for window change. */
1.132 djm 1508: signal(SIGWINCH, SIG_DFL);
1.11 markus 1509:
1.76 markus 1510: channel_free_all();
1.11 markus 1511:
1.75 markus 1512: if (have_pty)
1513: leave_raw_mode();
1514:
1515: /* restore blocking io */
1516: if (!isatty(fileno(stdin)))
1517: unset_nonblock(fileno(stdin));
1518: if (!isatty(fileno(stdout)))
1519: unset_nonblock(fileno(stdout));
1520: if (!isatty(fileno(stderr)))
1521: unset_nonblock(fileno(stderr));
1.116 dtucker 1522:
1523: /*
1524: * If there was no shell or command requested, there will be no remote
1525: * exit status to be returned. In that case, clear error code if the
1526: * connection was deliberately terminated at this end.
1527: */
1528: if (no_shell_flag && received_signal == SIGTERM) {
1529: received_signal = 0;
1530: exit_status = 0;
1531: }
1.75 markus 1532:
1.113 markus 1533: if (received_signal)
1.89 itojun 1534: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1535:
1.13 markus 1536: /*
1537: * In interactive mode (with pseudo tty) display a message indicating
1538: * that the connection has been closed.
1539: */
1.11 markus 1540: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1541: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1542: buffer_append(&stderr_buffer, buf, strlen(buf));
1543: }
1.70 markus 1544:
1.11 markus 1545: /* Output any buffered data for stdout. */
1.70 markus 1546: while (buffer_len(&stdout_buffer) > 0) {
1547: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1548: buffer_len(&stdout_buffer));
1.70 markus 1549: if (len <= 0) {
1.11 markus 1550: error("Write failed flushing stdout buffer.");
1.70 markus 1551: break;
1552: }
1.11 markus 1553: buffer_consume(&stdout_buffer, len);
1.57 markus 1554: stdout_bytes += len;
1.11 markus 1555: }
1556:
1557: /* Output any buffered data for stderr. */
1.70 markus 1558: while (buffer_len(&stderr_buffer) > 0) {
1559: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1560: buffer_len(&stderr_buffer));
1.70 markus 1561: if (len <= 0) {
1.11 markus 1562: error("Write failed flushing stderr buffer.");
1.70 markus 1563: break;
1564: }
1.11 markus 1565: buffer_consume(&stderr_buffer, len);
1.57 markus 1566: stderr_bytes += len;
1.11 markus 1567: }
1568:
1569: /* Clear and free any buffers. */
1570: memset(buf, 0, sizeof(buf));
1571: buffer_free(&stdin_buffer);
1572: buffer_free(&stdout_buffer);
1573: buffer_free(&stderr_buffer);
1574:
1575: /* Report bytes transferred, and transfer rates. */
1576: total_time = get_current_time() - start_time;
1577: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1578: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1579: if (total_time > 0)
1580: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1581: stdin_bytes / total_time, stdout_bytes / total_time,
1582: stderr_bytes / total_time);
1.11 markus 1583:
1584: /* Return the exit status of the program. */
1585: debug("Exit status %d", exit_status);
1586: return exit_status;
1.15 markus 1587: }
1588:
1589: /*********/
1590:
1.77 itojun 1591: static void
1.94 markus 1592: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1593: {
1.42 markus 1594: u_int data_len;
1.15 markus 1595: char *data = packet_get_string(&data_len);
1.93 markus 1596: packet_check_eom();
1.15 markus 1597: buffer_append(&stdout_buffer, data, data_len);
1598: memset(data, 0, data_len);
1599: xfree(data);
1600: }
1.77 itojun 1601: static void
1.94 markus 1602: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1603: {
1.42 markus 1604: u_int data_len;
1.15 markus 1605: char *data = packet_get_string(&data_len);
1.93 markus 1606: packet_check_eom();
1.15 markus 1607: buffer_append(&stderr_buffer, data, data_len);
1608: memset(data, 0, data_len);
1609: xfree(data);
1610: }
1.77 itojun 1611: static void
1.94 markus 1612: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1613: {
1614: exit_status = packet_get_int();
1.93 markus 1615: packet_check_eom();
1.15 markus 1616: /* Acknowledge the exit. */
1617: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1618: packet_send();
1619: /*
1620: * Must wait for packet to be sent since we are
1621: * exiting the loop.
1622: */
1623: packet_write_wait();
1624: /* Flag that we want to exit. */
1625: quit_pending = 1;
1626: }
1.115 markus 1627: static void
1628: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1629: {
1630: Channel *c = NULL;
1631: int remote_id, sock;
1632:
1633: /* Read the remote channel number from the message. */
1634: remote_id = packet_get_int();
1635: packet_check_eom();
1636:
1637: /*
1638: * Get a connection to the local authentication agent (this may again
1639: * get forwarded).
1640: */
1641: sock = ssh_get_authentication_socket();
1642:
1643: /*
1644: * If we could not connect the agent, send an error message back to
1645: * the server. This should never happen unless the agent dies,
1646: * because authentication forwarding is only enabled if we have an
1647: * agent.
1648: */
1649: if (sock >= 0) {
1650: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1651: -1, 0, 0, 0, "authentication agent connection", 1);
1652: c->remote_id = remote_id;
1653: c->force_drain = 1;
1654: }
1655: if (c == NULL) {
1656: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1657: packet_put_int(remote_id);
1658: } else {
1659: /* Send a confirmation to the remote host. */
1660: debug("Forwarding authentication connection.");
1661: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1662: packet_put_int(remote_id);
1663: packet_put_int(c->self);
1664: }
1665: packet_send();
1666: }
1.15 markus 1667:
1.77 itojun 1668: static Channel *
1.40 markus 1669: client_request_forwarded_tcpip(const char *request_type, int rchan)
1670: {
1.103 deraadt 1671: Channel *c = NULL;
1.40 markus 1672: char *listen_address, *originator_address;
1673: int listen_port, originator_port;
1.67 markus 1674: int sock;
1.40 markus 1675:
1676: /* Get rest of the packet */
1677: listen_address = packet_get_string(NULL);
1678: listen_port = packet_get_int();
1679: originator_address = packet_get_string(NULL);
1680: originator_port = packet_get_int();
1.93 markus 1681: packet_check_eom();
1.40 markus 1682:
1683: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1684: listen_address, listen_port, originator_address, originator_port);
1685:
1.80 stevesk 1686: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1687: if (sock < 0) {
1688: xfree(originator_address);
1689: xfree(listen_address);
1690: return NULL;
1691: }
1692: c = channel_new("forwarded-tcpip",
1693: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1694: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1695: originator_address, 1);
1.40 markus 1696: xfree(originator_address);
1697: xfree(listen_address);
1698: return c;
1699: }
1700:
1.103 deraadt 1701: static Channel *
1.40 markus 1702: client_request_x11(const char *request_type, int rchan)
1703: {
1704: Channel *c = NULL;
1705: char *originator;
1706: int originator_port;
1.67 markus 1707: int sock;
1.40 markus 1708:
1709: if (!options.forward_x11) {
1710: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1711: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1712: return NULL;
1713: }
1714: originator = packet_get_string(NULL);
1715: if (datafellows & SSH_BUG_X11FWD) {
1716: debug2("buggy server: x11 request w/o originator_port");
1717: originator_port = 0;
1718: } else {
1719: originator_port = packet_get_int();
1720: }
1.93 markus 1721: packet_check_eom();
1.40 markus 1722: /* XXX check permission */
1.47 markus 1723: debug("client_request_x11: request from %s %d", originator,
1724: originator_port);
1.67 markus 1725: xfree(originator);
1.40 markus 1726: sock = x11_connect_display();
1.67 markus 1727: if (sock < 0)
1728: return NULL;
1729: c = channel_new("x11",
1730: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1731: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1732: c->force_drain = 1;
1.40 markus 1733: return c;
1734: }
1735:
1.103 deraadt 1736: static Channel *
1.40 markus 1737: client_request_agent(const char *request_type, int rchan)
1738: {
1739: Channel *c = NULL;
1.67 markus 1740: int sock;
1.40 markus 1741:
1742: if (!options.forward_agent) {
1743: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1744: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1745: return NULL;
1746: }
1747: sock = ssh_get_authentication_socket();
1.67 markus 1748: if (sock < 0)
1749: return NULL;
1750: c = channel_new("authentication agent connection",
1751: SSH_CHANNEL_OPEN, sock, sock, -1,
1752: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1753: "authentication agent connection", 1);
1.82 markus 1754: c->force_drain = 1;
1.40 markus 1755: return c;
1756: }
1757:
1.22 markus 1758: /* XXXX move to generic input handler */
1.77 itojun 1759: static void
1.94 markus 1760: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1761: {
1762: Channel *c = NULL;
1763: char *ctype;
1764: int rchan;
1.102 markus 1765: u_int rmaxpack, rwindow, len;
1.22 markus 1766:
1767: ctype = packet_get_string(&len);
1768: rchan = packet_get_int();
1769: rwindow = packet_get_int();
1770: rmaxpack = packet_get_int();
1771:
1.24 markus 1772: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1773: ctype, rchan, rwindow, rmaxpack);
1774:
1.40 markus 1775: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1776: c = client_request_forwarded_tcpip(ctype, rchan);
1777: } else if (strcmp(ctype, "x11") == 0) {
1778: c = client_request_x11(ctype, rchan);
1779: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1780: c = client_request_agent(ctype, rchan);
1.22 markus 1781: }
1782: /* XXX duplicate : */
1783: if (c != NULL) {
1784: debug("confirm %s", ctype);
1785: c->remote_id = rchan;
1786: c->remote_window = rwindow;
1787: c->remote_maxpacket = rmaxpack;
1.69 markus 1788: if (c->type != SSH_CHANNEL_CONNECTING) {
1789: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1790: packet_put_int(c->remote_id);
1791: packet_put_int(c->self);
1792: packet_put_int(c->local_window);
1793: packet_put_int(c->local_maxpacket);
1794: packet_send();
1795: }
1.22 markus 1796: } else {
1797: debug("failure %s", ctype);
1798: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1799: packet_put_int(rchan);
1800: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1801: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1802: packet_put_cstring("open failed");
1.66 markus 1803: packet_put_cstring("");
1804: }
1.22 markus 1805: packet_send();
1806: }
1807: xfree(ctype);
1808: }
1.77 itojun 1809: static void
1.94 markus 1810: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1811: {
1812: Channel *c = NULL;
1.123 djm 1813: int exitval, id, reply, success = 0;
1.48 markus 1814: char *rtype;
1815:
1816: id = packet_get_int();
1817: rtype = packet_get_string(NULL);
1818: reply = packet_get_char();
1819:
1820: debug("client_input_channel_req: channel %d rtype %s reply %d",
1821: id, rtype, reply);
1822:
1.128 djm 1823: if (id == -1) {
1824: error("client_input_channel_req: request for channel -1");
1825: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1826: error("client_input_channel_req: channel %d: unknown channel", id);
1827: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1828: exitval = packet_get_int();
1829: if (id == session_ident) {
1830: success = 1;
1831: exit_status = exitval;
1832: } else if (c->ctl_fd == -1) {
1833: error("client_input_channel_req: unexpected channel %d",
1834: session_ident);
1835: } else {
1836: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1837: success = 1;
1838: }
1.93 markus 1839: packet_check_eom();
1.48 markus 1840: }
1841: if (reply) {
1842: packet_start(success ?
1843: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1844: packet_put_int(id);
1.48 markus 1845: packet_send();
1846: }
1847: xfree(rtype);
1848: }
1.95 markus 1849: static void
1850: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1851: {
1852: char *rtype;
1853: int want_reply;
1854: int success = 0;
1855:
1856: rtype = packet_get_string(NULL);
1857: want_reply = packet_get_char();
1.117 markus 1858: debug("client_input_global_request: rtype %s want_reply %d",
1859: rtype, want_reply);
1.95 markus 1860: if (want_reply) {
1861: packet_start(success ?
1862: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1863: packet_send();
1864: packet_write_wait();
1865: }
1866: xfree(rtype);
1867: }
1.22 markus 1868:
1.123 djm 1869: void
1.129 deraadt 1870: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1871: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1872: dispatch_fn *subsys_repl)
1873: {
1874: int len;
1.132 djm 1875: Channel *c = NULL;
1.123 djm 1876:
1877: debug2("%s: id %d", __func__, id);
1878:
1.132 djm 1879: if ((c = channel_lookup(id)) == NULL)
1880: fatal("client_session2_setup: channel %d: unknown channel", id);
1881:
1.123 djm 1882: if (want_tty) {
1883: struct winsize ws;
1884: struct termios tio;
1885:
1886: /* Store window size in the packet. */
1887: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1888: memset(&ws, 0, sizeof(ws));
1889:
1890: channel_request_start(id, "pty-req", 0);
1891: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1892: packet_put_int((u_int)ws.ws_col);
1893: packet_put_int((u_int)ws.ws_row);
1894: packet_put_int((u_int)ws.ws_xpixel);
1895: packet_put_int((u_int)ws.ws_ypixel);
1.123 djm 1896: tio = get_saved_tio();
1897: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1898: packet_send();
1899: /* XXX wait for reply */
1.132 djm 1900: c->client_tty = 1;
1.123 djm 1901: }
1902:
1903: /* Transfer any environment variables from client to server */
1.126 djm 1904: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1905: int i, j, matched;
1906: char *name, *val;
1907:
1908: debug("Sending environment.");
1.126 djm 1909: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1910: /* Split */
1.126 djm 1911: name = xstrdup(env[i]);
1.123 djm 1912: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1913: xfree(name);
1.123 djm 1914: continue;
1915: }
1916: *val++ = '\0';
1917:
1918: matched = 0;
1919: for (j = 0; j < options.num_send_env; j++) {
1920: if (match_pattern(name, options.send_env[j])) {
1921: matched = 1;
1922: break;
1923: }
1924: }
1925: if (!matched) {
1926: debug3("Ignored env %s", name);
1.144 stevesk 1927: xfree(name);
1.123 djm 1928: continue;
1929: }
1930:
1931: debug("Sending env %s = %s", name, val);
1932: channel_request_start(id, "env", 0);
1933: packet_put_cstring(name);
1934: packet_put_cstring(val);
1935: packet_send();
1.144 stevesk 1936: xfree(name);
1.123 djm 1937: }
1938: }
1939:
1940: len = buffer_len(cmd);
1941: if (len > 0) {
1942: if (len > 900)
1943: len = 900;
1944: if (want_subsystem) {
1945: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1946: channel_request_start(id, "subsystem", subsys_repl != NULL);
1947: if (subsys_repl != NULL) {
1948: /* register callback for reply */
1949: /* XXX we assume that client_loop has already been called */
1950: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1951: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1952: }
1953: } else {
1954: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1955: channel_request_start(id, "exec", 0);
1956: }
1957: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1958: packet_send();
1959: } else {
1960: channel_request_start(id, "shell", 0);
1961: packet_send();
1962: }
1963: }
1964:
1.77 itojun 1965: static void
1.49 itojun 1966: client_init_dispatch_20(void)
1.16 markus 1967: {
1.55 markus 1968: dispatch_init(&dispatch_protocol_error);
1.100 markus 1969:
1.16 markus 1970: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1971: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1972: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1973: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1974: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1975: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1976: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1977: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1978: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1979: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1980:
1981: /* rekeying */
1982: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1983:
1984: /* global request reply messages */
1985: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1986: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1987: }
1.77 itojun 1988: static void
1.49 itojun 1989: client_init_dispatch_13(void)
1.15 markus 1990: {
1991: dispatch_init(NULL);
1992: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1993: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1994: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1995: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1996: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1997: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1998: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1999: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2000: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2001:
2002: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2003: &client_input_agent_open : &deny_input_open);
1.39 markus 2004: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2005: &x11_input_open : &deny_input_open);
1.15 markus 2006: }
1.77 itojun 2007: static void
1.49 itojun 2008: client_init_dispatch_15(void)
1.15 markus 2009: {
2010: client_init_dispatch_13();
2011: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2012: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2013: }
1.79 stevesk 2014: static void
1.49 itojun 2015: client_init_dispatch(void)
1.15 markus 2016: {
1.16 markus 2017: if (compat20)
2018: client_init_dispatch_20();
2019: else if (compat13)
1.15 markus 2020: client_init_dispatch_13();
2021: else
2022: client_init_dispatch_15();
1.113 markus 2023: }
2024:
2025: /* client specific fatal cleanup */
2026: void
1.114 markus 2027: cleanup_exit(int i)
1.113 markus 2028: {
2029: leave_raw_mode();
2030: leave_non_blocking();
1.123 djm 2031: if (options.control_path != NULL && control_fd != -1)
2032: unlink(options.control_path);
1.114 markus 2033: _exit(i);
1.1 deraadt 2034: }
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