Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.178
1.178 ! djm 1: /* $OpenBSD: clientloop.c,v 1.177 2007/01/21 01:41:54 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:
1.152 stevesk 62:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.172 stevesk 68: #include <sys/param.h>
1.150 stevesk 69:
1.155 stevesk 70: #include <ctype.h>
1.168 stevesk 71: #include <errno.h>
1.151 stevesk 72: #include <paths.h>
1.153 stevesk 73: #include <signal.h>
1.174 stevesk 74: #include <stdio.h>
1.173 stevesk 75: #include <stdlib.h>
1.170 stevesk 76: #include <string.h>
1.150 stevesk 77: #include <termios.h>
1.175 deraadt 78: #include <pwd.h>
1.169 stevesk 79: #include <unistd.h>
1.1 deraadt 80:
1.175 deraadt 81: #include "xmalloc.h"
1.45 markus 82: #include "ssh.h"
83: #include "ssh1.h"
84: #include "ssh2.h"
1.1 deraadt 85: #include "packet.h"
86: #include "buffer.h"
1.15 markus 87: #include "compat.h"
1.74 markus 88: #include "channels.h"
1.15 markus 89: #include "dispatch.h"
1.40 markus 90: #include "key.h"
1.175 deraadt 91: #include "cipher.h"
1.54 markus 92: #include "kex.h"
1.45 markus 93: #include "log.h"
94: #include "readconf.h"
95: #include "clientloop.h"
1.147 djm 96: #include "sshconnect.h"
1.40 markus 97: #include "authfd.h"
1.45 markus 98: #include "atomicio.h"
1.118 deraadt 99: #include "sshpty.h"
1.63 markus 100: #include "misc.h"
1.123 djm 101: #include "monitor_fdpass.h"
102: #include "match.h"
103: #include "msg.h"
1.39 markus 104:
105: /* import options */
106: extern Options options;
107:
1.1 deraadt 108: /* Flag indicating that stdin should be redirected from /dev/null. */
109: extern int stdin_null_flag;
110:
1.116 dtucker 111: /* Flag indicating that no shell has been requested */
112: extern int no_shell_flag;
113:
1.123 djm 114: /* Control socket */
115: extern int control_fd;
116:
1.13 markus 117: /*
118: * Name of the host we are connecting to. This is the name given on the
119: * command line, or the HostName specified for the user-supplied name in a
120: * configuration file.
121: */
1.1 deraadt 122: extern char *host;
123:
1.13 markus 124: /*
125: * Flag to indicate that we have received a window change signal which has
126: * not yet been processed. This will cause a message indicating the new
127: * window size to be sent to the server a little later. This is volatile
128: * because this is updated in a signal handler.
129: */
1.88 markus 130: static volatile sig_atomic_t received_window_change_signal = 0;
131: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 132:
1.145 djm 133: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 134: static int in_non_blocking_mode = 0;
135:
136: /* Common data for the client loop code. */
1.162 djm 137: static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.31 markus 138: static int escape_char; /* Escape character. */
1.11 markus 139: static int escape_pending; /* Last character was the escape character */
140: static int last_was_cr; /* Last character was a newline. */
141: static int exit_status; /* Used to store the exit status of the command. */
142: static int stdin_eof; /* EOF has been encountered on standard error. */
143: static Buffer stdin_buffer; /* Buffer for stdin data. */
144: static Buffer stdout_buffer; /* Buffer for stdout data. */
145: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 146: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
147: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 148: static int connection_in; /* Connection to server (input). */
149: static int connection_out; /* Connection to server (output). */
1.56 markus 150: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 151: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 152: static int server_alive_timeouts = 0;
1.1 deraadt 153:
1.77 itojun 154: static void client_init_dispatch(void);
1.16 markus 155: int session_ident = -1;
156:
1.123 djm 157: struct confirm_ctx {
158: int want_tty;
159: int want_subsys;
1.140 djm 160: int want_x_fwd;
161: int want_agent_fwd;
1.123 djm 162: Buffer cmd;
163: char *term;
164: struct termios tio;
1.126 djm 165: char **env;
1.123 djm 166: };
167:
1.54 markus 168: /*XXX*/
169: extern Kex *xxx_kex;
170:
1.123 djm 171: void ssh_process_session2_setup(int, int, int, Buffer *);
172:
1.1 deraadt 173: /* Restores stdin to blocking mode. */
174:
1.77 itojun 175: static void
1.49 itojun 176: leave_non_blocking(void)
1.1 deraadt 177: {
1.11 markus 178: if (in_non_blocking_mode) {
1.125 djm 179: unset_nonblock(fileno(stdin));
1.11 markus 180: in_non_blocking_mode = 0;
181: }
1.1 deraadt 182: }
183:
1.11 markus 184: /* Puts stdin terminal in non-blocking mode. */
185:
1.77 itojun 186: static void
1.49 itojun 187: enter_non_blocking(void)
1.1 deraadt 188: {
1.11 markus 189: in_non_blocking_mode = 1;
1.124 djm 190: set_nonblock(fileno(stdin));
1.1 deraadt 191: }
192:
1.13 markus 193: /*
194: * Signal handler for the window change signal (SIGWINCH). This just sets a
195: * flag indicating that the window has changed.
196: */
1.157 deraadt 197: /*ARGSUSED */
1.77 itojun 198: static void
1.11 markus 199: window_change_handler(int sig)
1.1 deraadt 200: {
1.11 markus 201: received_window_change_signal = 1;
202: signal(SIGWINCH, window_change_handler);
1.1 deraadt 203: }
204:
1.13 markus 205: /*
206: * Signal handler for signals that cause the program to terminate. These
207: * signals must be trapped to restore terminal modes.
208: */
1.157 deraadt 209: /*ARGSUSED */
1.77 itojun 210: static void
1.11 markus 211: signal_handler(int sig)
1.1 deraadt 212: {
1.75 markus 213: received_signal = sig;
214: quit_pending = 1;
1.1 deraadt 215: }
216:
1.13 markus 217: /*
218: * Returns current time in seconds from Jan 1, 1970 with the maximum
219: * available resolution.
220: */
1.1 deraadt 221:
1.77 itojun 222: static double
1.49 itojun 223: get_current_time(void)
1.1 deraadt 224: {
1.11 markus 225: struct timeval tv;
226: gettimeofday(&tv, NULL);
227: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 228: }
229:
230: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
231: void
232: client_x11_get_proto(const char *display, const char *xauth_path,
233: u_int trusted, char **_proto, char **_data)
234: {
235: char cmd[1024];
236: char line[512];
237: char xdisplay[512];
238: static char proto[512], data[512];
239: FILE *f;
240: int got_data = 0, generated = 0, do_unlink = 0, i;
241: char *xauthdir, *xauthfile;
242: struct stat st;
243:
244: xauthdir = xauthfile = NULL;
245: *_proto = proto;
246: *_data = data;
247: proto[0] = data[0] = '\0';
248:
249: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
250: debug("No xauth program.");
251: } else {
252: if (display == NULL) {
253: debug("x11_get_proto: DISPLAY not set");
254: return;
255: }
256: /*
257: * Handle FamilyLocal case where $DISPLAY does
258: * not match an authorization entry. For this we
259: * just try "xauth list unix:displaynum.screennum".
260: * XXX: "localhost" match to determine FamilyLocal
261: * is not perfect.
262: */
263: if (strncmp(display, "localhost:", 10) == 0) {
264: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
265: display + 10);
266: display = xdisplay;
267: }
268: if (trusted == 0) {
269: xauthdir = xmalloc(MAXPATHLEN);
270: xauthfile = xmalloc(MAXPATHLEN);
271: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
272: if (mkdtemp(xauthdir) != NULL) {
273: do_unlink = 1;
274: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
275: xauthdir);
276: snprintf(cmd, sizeof(cmd),
277: "%s -f %s generate %s " SSH_X11_PROTO
278: " untrusted timeout 1200 2>" _PATH_DEVNULL,
279: xauth_path, xauthfile, display);
280: debug2("x11_get_proto: %s", cmd);
281: if (system(cmd) == 0)
282: generated = 1;
283: }
284: }
285: snprintf(cmd, sizeof(cmd),
1.142 markus 286: "%s %s%s list %s 2>" _PATH_DEVNULL,
1.138 djm 287: xauth_path,
288: generated ? "-f " : "" ,
289: generated ? xauthfile : "",
290: display);
291: debug2("x11_get_proto: %s", cmd);
292: f = popen(cmd, "r");
293: if (f && fgets(line, sizeof(line), f) &&
294: sscanf(line, "%*s %511s %511s", proto, data) == 2)
295: got_data = 1;
296: if (f)
297: pclose(f);
298: }
299:
300: if (do_unlink) {
301: unlink(xauthfile);
302: rmdir(xauthdir);
303: }
304: if (xauthdir)
305: xfree(xauthdir);
306: if (xauthfile)
307: xfree(xauthfile);
308:
309: /*
310: * If we didn't get authentication data, just make up some
311: * data. The forwarding code will check the validity of the
312: * response anyway, and substitute this data. The X11
313: * server, however, will ignore this fake data and use
314: * whatever authentication mechanisms it was using otherwise
315: * for the local connection.
316: */
317: if (!got_data) {
318: u_int32_t rnd = 0;
319:
320: logit("Warning: No xauth data; "
321: "using fake authentication data for X11 forwarding.");
322: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
323: for (i = 0; i < 16; i++) {
324: if (i % 4 == 0)
325: rnd = arc4random();
326: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
327: rnd & 0xff);
328: rnd >>= 8;
329: }
330: }
1.1 deraadt 331: }
332:
1.13 markus 333: /*
334: * This is called when the interactive is entered. This checks if there is
335: * an EOF coming on stdin. We must check this explicitly, as select() does
336: * not appear to wake up when redirecting from /dev/null.
337: */
1.1 deraadt 338:
1.77 itojun 339: static void
1.49 itojun 340: client_check_initial_eof_on_stdin(void)
1.1 deraadt 341: {
1.11 markus 342: int len;
343: char buf[1];
1.1 deraadt 344:
1.13 markus 345: /*
346: * If standard input is to be "redirected from /dev/null", we simply
347: * mark that we have seen an EOF and send an EOF message to the
348: * server. Otherwise, we try to read a single character; it appears
349: * that for some files, such /dev/null, select() never wakes up for
350: * read for this descriptor, which means that we never get EOF. This
351: * way we will get the EOF if stdin comes from /dev/null or similar.
352: */
1.11 markus 353: if (stdin_null_flag) {
354: /* Fake EOF on stdin. */
355: debug("Sending eof.");
356: stdin_eof = 1;
357: packet_start(SSH_CMSG_EOF);
358: packet_send();
359: } else {
360: enter_non_blocking();
361:
362: /* Check for immediate EOF on stdin. */
363: len = read(fileno(stdin), buf, 1);
364: if (len == 0) {
1.13 markus 365: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 366: debug("Sending eof.");
367: stdin_eof = 1;
368: packet_start(SSH_CMSG_EOF);
369: packet_send();
370: } else if (len > 0) {
1.13 markus 371: /*
372: * Got data. We must store the data in the buffer,
373: * and also process it as an escape character if
374: * appropriate.
375: */
1.42 markus 376: if ((u_char) buf[0] == escape_char)
1.11 markus 377: escape_pending = 1;
1.52 markus 378: else
1.11 markus 379: buffer_append(&stdin_buffer, buf, 1);
380: }
381: leave_non_blocking();
382: }
1.1 deraadt 383: }
384:
385:
1.13 markus 386: /*
387: * Make packets from buffered stdin data, and buffer them for sending to the
388: * connection.
389: */
1.1 deraadt 390:
1.77 itojun 391: static void
1.49 itojun 392: client_make_packets_from_stdin_data(void)
1.1 deraadt 393: {
1.42 markus 394: u_int len;
1.1 deraadt 395:
1.11 markus 396: /* Send buffered stdin data to the server. */
397: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 398: packet_not_very_much_data_to_write()) {
1.11 markus 399: len = buffer_len(&stdin_buffer);
400: /* Keep the packets at reasonable size. */
401: if (len > packet_get_maxsize())
402: len = packet_get_maxsize();
403: packet_start(SSH_CMSG_STDIN_DATA);
404: packet_put_string(buffer_ptr(&stdin_buffer), len);
405: packet_send();
406: buffer_consume(&stdin_buffer, len);
1.52 markus 407: stdin_bytes += len;
1.11 markus 408: /* If we have a pending EOF, send it now. */
409: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
410: packet_start(SSH_CMSG_EOF);
411: packet_send();
412: }
1.1 deraadt 413: }
414: }
415:
1.13 markus 416: /*
417: * Checks if the client window has changed, and sends a packet about it to
418: * the server if so. The actual change is detected elsewhere (by a software
419: * interrupt on Unix); this just checks the flag and sends a message if
420: * appropriate.
421: */
1.1 deraadt 422:
1.77 itojun 423: static void
1.49 itojun 424: client_check_window_change(void)
1.1 deraadt 425: {
1.16 markus 426: struct winsize ws;
427:
428: if (! received_window_change_signal)
429: return;
430: /** XXX race */
431: received_window_change_signal = 0;
432:
1.37 markus 433: debug2("client_check_window_change: changed");
1.16 markus 434:
435: if (compat20) {
1.123 djm 436: channel_send_window_changes();
1.16 markus 437: } else {
1.123 djm 438: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
439: return;
1.16 markus 440: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 441: packet_put_int((u_int)ws.ws_row);
442: packet_put_int((u_int)ws.ws_col);
443: packet_put_int((u_int)ws.ws_xpixel);
444: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 445: packet_send();
1.1 deraadt 446: }
447: }
448:
1.117 markus 449: static void
450: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
451: {
452: server_alive_timeouts = 0;
453: client_global_request_reply_fwd(type, seq, ctxt);
454: }
455:
456: static void
457: server_alive_check(void)
458: {
1.176 markus 459: if (++server_alive_timeouts > options.server_alive_count_max) {
460: logit("Timeout, server not responding.");
461: cleanup_exit(255);
462: }
1.117 markus 463: packet_start(SSH2_MSG_GLOBAL_REQUEST);
464: packet_put_cstring("keepalive@openssh.com");
465: packet_put_char(1); /* boolean: want reply */
466: packet_send();
467: }
468:
1.13 markus 469: /*
470: * Waits until the client can do something (some data becomes available on
471: * one of the file descriptors).
472: */
1.77 itojun 473: static void
1.46 markus 474: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 475: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 476: {
1.117 markus 477: struct timeval tv, *tvp;
478: int ret;
479:
1.46 markus 480: /* Add any selections by the channel mechanism. */
1.81 markus 481: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 482:
1.16 markus 483: if (!compat20) {
1.17 markus 484: /* Read from the connection, unless our buffers are full. */
1.16 markus 485: if (buffer_len(&stdout_buffer) < buffer_high &&
486: buffer_len(&stderr_buffer) < buffer_high &&
487: channel_not_very_much_buffered_data())
1.46 markus 488: FD_SET(connection_in, *readsetp);
1.17 markus 489: /*
490: * Read from stdin, unless we have seen EOF or have very much
491: * buffered data to send to the server.
492: */
493: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 494: FD_SET(fileno(stdin), *readsetp);
1.17 markus 495:
496: /* Select stdout/stderr if have data in buffer. */
497: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 498: FD_SET(fileno(stdout), *writesetp);
1.17 markus 499: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 500: FD_SET(fileno(stderr), *writesetp);
1.16 markus 501: } else {
1.71 markus 502: /* channel_prepare_select could have closed the last channel */
1.84 markus 503: if (session_closed && !channel_still_open() &&
504: !packet_have_data_to_write()) {
505: /* clear mask since we did not call select() */
1.87 markus 506: memset(*readsetp, 0, *nallocp);
507: memset(*writesetp, 0, *nallocp);
1.84 markus 508: return;
1.71 markus 509: } else {
510: FD_SET(connection_in, *readsetp);
511: }
1.16 markus 512: }
1.11 markus 513:
514: /* Select server connection if have data to write to the server. */
515: if (packet_have_data_to_write())
1.46 markus 516: FD_SET(connection_out, *writesetp);
1.11 markus 517:
1.123 djm 518: if (control_fd != -1)
519: FD_SET(control_fd, *readsetp);
520:
1.13 markus 521: /*
522: * Wait for something to happen. This will suspend the process until
523: * some selected descriptor can be read, written, or has some other
1.117 markus 524: * event pending.
1.13 markus 525: */
1.11 markus 526:
1.117 markus 527: if (options.server_alive_interval == 0 || !compat20)
528: tvp = NULL;
1.129 deraadt 529: else {
1.117 markus 530: tv.tv_sec = options.server_alive_interval;
531: tv.tv_usec = 0;
532: tvp = &tv;
533: }
534: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
535: if (ret < 0) {
1.11 markus 536: char buf[100];
1.51 markus 537:
538: /*
539: * We have to clear the select masks, because we return.
540: * We have to return, because the mainloop checks for the flags
541: * set by the signal handlers.
542: */
1.87 markus 543: memset(*readsetp, 0, *nallocp);
544: memset(*writesetp, 0, *nallocp);
1.50 deraadt 545:
1.11 markus 546: if (errno == EINTR)
547: return;
548: /* Note: we might still have data in the buffers. */
549: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
550: buffer_append(&stderr_buffer, buf, strlen(buf));
551: quit_pending = 1;
1.117 markus 552: } else if (ret == 0)
553: server_alive_check();
1.11 markus 554: }
555:
1.77 itojun 556: static void
1.31 markus 557: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 558: {
1.11 markus 559: /* Flush stdout and stderr buffers. */
1.31 markus 560: if (buffer_len(bout) > 0)
1.112 deraadt 561: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 562: if (buffer_len(berr) > 0)
1.112 deraadt 563: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 564:
565: leave_raw_mode();
566:
1.13 markus 567: /*
568: * Free (and clear) the buffer to reduce the amount of data that gets
569: * written to swap.
570: */
1.31 markus 571: buffer_free(bin);
572: buffer_free(bout);
573: buffer_free(berr);
1.11 markus 574:
575: /* Send the suspend signal to the program itself. */
576: kill(getpid(), SIGTSTP);
577:
1.132 djm 578: /* Reset window sizes in case they have changed */
579: received_window_change_signal = 1;
1.11 markus 580:
581: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 582: buffer_init(bin);
583: buffer_init(bout);
584: buffer_init(berr);
1.11 markus 585:
586: enter_raw_mode();
587: }
588:
1.77 itojun 589: static void
1.161 deraadt 590: client_process_net_input(fd_set *readset)
1.11 markus 591: {
1.17 markus 592: int len;
593: char buf[8192];
1.11 markus 594:
1.13 markus 595: /*
596: * Read input from the server, and add any such data to the buffer of
597: * the packet subsystem.
598: */
1.11 markus 599: if (FD_ISSET(connection_in, readset)) {
600: /* Read as much as possible. */
601: len = read(connection_in, buf, sizeof(buf));
602: if (len == 0) {
603: /* Received EOF. The remote host has closed the connection. */
604: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
605: host);
1.1 deraadt 606: buffer_append(&stderr_buffer, buf, strlen(buf));
607: quit_pending = 1;
608: return;
1.11 markus 609: }
1.13 markus 610: /*
611: * There is a kernel bug on Solaris that causes select to
612: * sometimes wake up even though there is no data available.
613: */
1.53 millert 614: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 615: len = 0;
616:
617: if (len < 0) {
618: /* An error has encountered. Perhaps there is a network problem. */
619: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
620: host, strerror(errno));
621: buffer_append(&stderr_buffer, buf, strlen(buf));
622: quit_pending = 1;
623: return;
624: }
625: packet_process_incoming(buf, len);
626: }
1.17 markus 627: }
1.16 markus 628:
1.97 jakob 629: static void
1.123 djm 630: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
631: {
632: int id;
633: Channel *c;
1.129 deraadt 634:
1.123 djm 635: id = packet_get_int();
636: packet_check_eom();
637:
638: if ((c = channel_lookup(id)) == NULL) {
639: error("%s: no channel for id %d", __func__, id);
640: return;
641: }
642:
643: if (type == SSH2_MSG_CHANNEL_SUCCESS)
644: debug2("Request suceeded on channel %d", id);
645: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
646: error("Request failed on channel %d", id);
647: channel_free(c);
648: }
649: }
650:
651: static void
652: client_extra_session2_setup(int id, void *arg)
653: {
654: struct confirm_ctx *cctx = arg;
1.140 djm 655: const char *display;
1.123 djm 656: Channel *c;
1.126 djm 657: int i;
1.129 deraadt 658:
1.123 djm 659: if (cctx == NULL)
660: fatal("%s: cctx == NULL", __func__);
661: if ((c = channel_lookup(id)) == NULL)
662: fatal("%s: no channel for id %d", __func__, id);
663:
1.141 djm 664: display = getenv("DISPLAY");
1.140 djm 665: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
666: char *proto, *data;
667: /* Get reasonable local authentication information. */
668: client_x11_get_proto(display, options.xauth_location,
669: options.forward_x11_trusted, &proto, &data);
670: /* Request forwarding with authentication spoofing. */
671: debug("Requesting X11 forwarding with authentication spoofing.");
672: x11_request_forwarding_with_spoofing(id, display, proto, data);
673: /* XXX wait for reply */
674: }
675:
676: if (cctx->want_agent_fwd && options.forward_agent) {
677: debug("Requesting authentication agent forwarding.");
678: channel_request_start(id, "auth-agent-req@openssh.com", 0);
679: packet_send();
680: }
681:
1.129 deraadt 682: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 683: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 684: client_subsystem_reply);
1.127 djm 685:
1.123 djm 686: c->confirm_ctx = NULL;
687: buffer_free(&cctx->cmd);
1.126 djm 688: xfree(cctx->term);
689: if (cctx->env != NULL) {
690: for (i = 0; cctx->env[i] != NULL; i++)
691: xfree(cctx->env[i]);
692: xfree(cctx->env);
1.129 deraadt 693: }
1.126 djm 694: xfree(cctx);
1.123 djm 695: }
696:
697: static void
1.161 deraadt 698: client_process_control(fd_set *readset)
1.123 djm 699: {
700: Buffer m;
701: Channel *c;
1.178 ! djm 702: int client_fd, new_fd[3], ver, allowed, window, packetmax;
1.123 djm 703: socklen_t addrlen;
704: struct sockaddr_storage addr;
705: struct confirm_ctx *cctx;
706: char *cmd;
1.139 djm 707: u_int i, len, env_len, command, flags;
1.123 djm 708: uid_t euid;
709: gid_t egid;
710:
711: /*
712: * Accept connection on control socket
713: */
714: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
715: return;
716:
717: memset(&addr, 0, sizeof(addr));
718: addrlen = sizeof(addr);
719: if ((client_fd = accept(control_fd,
720: (struct sockaddr*)&addr, &addrlen)) == -1) {
721: error("%s accept: %s", __func__, strerror(errno));
722: return;
723: }
724:
725: if (getpeereid(client_fd, &euid, &egid) < 0) {
726: error("%s getpeereid failed: %s", __func__, strerror(errno));
727: close(client_fd);
728: return;
729: }
730: if ((euid != 0) && (getuid() != euid)) {
731: error("control mode uid mismatch: peer euid %u != uid %u",
732: (u_int) euid, (u_int) getuid());
733: close(client_fd);
734: return;
735: }
1.127 djm 736:
1.134 djm 737: unset_nonblock(client_fd);
738:
739: /* Read command */
740: buffer_init(&m);
741: if (ssh_msg_recv(client_fd, &m) == -1) {
742: error("%s: client msg_recv failed", __func__);
743: close(client_fd);
744: buffer_free(&m);
745: return;
746: }
1.140 djm 747: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 748: error("%s: wrong client version %d", __func__, ver);
749: buffer_free(&m);
750: close(client_fd);
751: return;
752: }
753:
1.127 djm 754: allowed = 1;
1.134 djm 755: command = buffer_get_int(&m);
756: flags = buffer_get_int(&m);
1.123 djm 757:
1.134 djm 758: buffer_clear(&m);
1.123 djm 759:
1.134 djm 760: switch (command) {
761: case SSHMUX_COMMAND_OPEN:
1.137 djm 762: if (options.control_master == SSHCTL_MASTER_ASK ||
763: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 764: allowed = ask_permission("Allow shared connection "
765: "to %s? ", host);
766: /* continue below */
767: break;
768: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 769: if (options.control_master == SSHCTL_MASTER_ASK ||
770: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 771: allowed = ask_permission("Terminate shared connection "
772: "to %s? ", host);
773: if (allowed)
774: quit_pending = 1;
1.136 deraadt 775: /* FALLTHROUGH */
1.134 djm 776: case SSHMUX_COMMAND_ALIVE_CHECK:
777: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
778: buffer_clear(&m);
779: buffer_put_int(&m, allowed);
780: buffer_put_int(&m, getpid());
1.140 djm 781: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 782: error("%s: client msg_send failed", __func__);
783: close(client_fd);
784: buffer_free(&m);
785: return;
786: }
787: buffer_free(&m);
788: close(client_fd);
789: return;
790: default:
791: error("Unsupported command %d", command);
792: buffer_free(&m);
793: close(client_fd);
794: return;
795: }
1.123 djm 796:
1.134 djm 797: /* Reply for SSHMUX_COMMAND_OPEN */
798: buffer_clear(&m);
1.127 djm 799: buffer_put_int(&m, allowed);
1.123 djm 800: buffer_put_int(&m, getpid());
1.140 djm 801: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 802: error("%s: client msg_send failed", __func__);
803: close(client_fd);
1.127 djm 804: buffer_free(&m);
1.123 djm 805: return;
806: }
807:
1.127 djm 808: if (!allowed) {
809: error("Refused control connection");
810: close(client_fd);
811: buffer_free(&m);
812: return;
813: }
814:
1.134 djm 815: buffer_clear(&m);
1.123 djm 816: if (ssh_msg_recv(client_fd, &m) == -1) {
817: error("%s: client msg_recv failed", __func__);
818: close(client_fd);
1.127 djm 819: buffer_free(&m);
1.123 djm 820: return;
821: }
1.140 djm 822: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 823: error("%s: wrong client version %d", __func__, ver);
824: buffer_free(&m);
825: close(client_fd);
826: return;
827: }
828:
1.159 djm 829: cctx = xcalloc(1, sizeof(*cctx));
1.134 djm 830: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
831: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 832: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
833: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 834: cctx->term = buffer_get_string(&m, &len);
835:
836: cmd = buffer_get_string(&m, &len);
837: buffer_init(&cctx->cmd);
838: buffer_append(&cctx->cmd, cmd, strlen(cmd));
839:
1.126 djm 840: env_len = buffer_get_int(&m);
841: env_len = MIN(env_len, 4096);
842: debug3("%s: receiving %d env vars", __func__, env_len);
843: if (env_len != 0) {
1.159 djm 844: cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
1.126 djm 845: for (i = 0; i < env_len; i++)
846: cctx->env[i] = buffer_get_string(&m, &len);
847: cctx->env[i] = NULL;
848: }
849:
1.123 djm 850: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
851: cctx->want_tty, cctx->want_subsys, cmd);
1.163 markus 852: xfree(cmd);
1.123 djm 853:
854: /* Gather fds from client */
855: new_fd[0] = mm_receive_fd(client_fd);
856: new_fd[1] = mm_receive_fd(client_fd);
857: new_fd[2] = mm_receive_fd(client_fd);
858:
859: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
860: new_fd[0], new_fd[1], new_fd[2]);
861:
862: /* Try to pick up ttymodes from client before it goes raw */
863: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
864: error("%s: tcgetattr: %s", __func__, strerror(errno));
865:
1.134 djm 866: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 867: buffer_clear(&m);
1.140 djm 868: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 869: error("%s: client msg_send failed", __func__);
870: close(client_fd);
871: close(new_fd[0]);
872: close(new_fd[1]);
873: close(new_fd[2]);
1.127 djm 874: buffer_free(&m);
1.134 djm 875: xfree(cctx->term);
876: if (env_len != 0) {
877: for (i = 0; i < env_len; i++)
878: xfree(cctx->env[i]);
879: xfree(cctx->env);
880: }
1.123 djm 881: return;
882: }
883: buffer_free(&m);
884:
885: /* enable nonblocking unless tty */
886: if (!isatty(new_fd[0]))
887: set_nonblock(new_fd[0]);
888: if (!isatty(new_fd[1]))
889: set_nonblock(new_fd[1]);
890: if (!isatty(new_fd[2]))
891: set_nonblock(new_fd[2]);
892:
893: set_nonblock(client_fd);
894:
1.178 ! djm 895: window = CHAN_SES_WINDOW_DEFAULT;
! 896: packetmax = CHAN_SES_PACKET_DEFAULT;
! 897: if (cctx->want_tty) {
! 898: window >>= 1;
! 899: packetmax >>= 1;
! 900: }
! 901:
1.129 deraadt 902: c = channel_new("session", SSH_CHANNEL_OPENING,
1.178 ! djm 903: new_fd[0], new_fd[1], new_fd[2], window, packetmax,
1.123 djm 904: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
905:
906: /* XXX */
907: c->ctl_fd = client_fd;
908:
909: debug3("%s: channel_new: %d", __func__, c->self);
910:
911: channel_send_open(c->self);
912: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
913: }
914:
915: static void
1.99 markus 916: process_cmdline(void)
1.97 jakob 917: {
918: void (*handler)(int);
1.135 djm 919: char *s, *cmd, *cancel_host;
1.121 djm 920: int delete = 0;
1.97 jakob 921: int local = 0;
1.135 djm 922: u_short cancel_port;
923: Forward fwd;
1.97 jakob 924:
925: leave_raw_mode();
1.101 markus 926: handler = signal(SIGINT, SIG_IGN);
1.99 markus 927: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 928: if (s == NULL)
929: goto out;
930: while (*s && isspace(*s))
931: s++;
1.121 djm 932: if (*s == '-')
933: s++; /* Skip cmdline '-', if any */
1.120 dtucker 934: if (*s == '\0')
1.97 jakob 935: goto out;
1.121 djm 936:
1.122 djm 937: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 938: logit("Commands:");
1.164 djm 939: logit(" -L[bind_address:]port:host:hostport "
940: "Request local forward");
941: logit(" -R[bind_address:]port:host:hostport "
942: "Request remote forward");
1.165 stevesk 943: logit(" -KR[bind_address:]port "
1.164 djm 944: "Cancel remote forward");
1.146 reyk 945: if (!options.permit_local_command)
946: goto out;
1.164 djm 947: logit(" !args "
948: "Execute local command");
1.146 reyk 949: goto out;
950: }
951:
952: if (*s == '!' && options.permit_local_command) {
953: s++;
954: ssh_local_cmd(s);
1.121 djm 955: goto out;
956: }
957:
958: if (*s == 'K') {
959: delete = 1;
960: s++;
961: }
962: if (*s != 'L' && *s != 'R') {
1.109 itojun 963: logit("Invalid command.");
1.97 jakob 964: goto out;
965: }
1.121 djm 966: if (*s == 'L')
1.97 jakob 967: local = 1;
1.121 djm 968: if (local && delete) {
969: logit("Not supported.");
970: goto out;
971: }
972: if ((!local || delete) && !compat20) {
1.109 itojun 973: logit("Not supported for SSH protocol version 1.");
1.97 jakob 974: goto out;
975: }
1.121 djm 976:
977: s++;
1.97 jakob 978: while (*s && isspace(*s))
979: s++;
980:
1.121 djm 981: if (delete) {
1.135 djm 982: cancel_port = 0;
983: cancel_host = hpdelim(&s); /* may be NULL */
984: if (s != NULL) {
985: cancel_port = a2port(s);
986: cancel_host = cleanhostname(cancel_host);
987: } else {
988: cancel_port = a2port(cancel_host);
989: cancel_host = NULL;
1.121 djm 990: }
1.135 djm 991: if (cancel_port == 0) {
992: logit("Bad forwarding close port");
1.121 djm 993: goto out;
994: }
1.135 djm 995: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 996: } else {
1.135 djm 997: if (!parse_forward(&fwd, s)) {
1.121 djm 998: logit("Bad forwarding specification.");
999: goto out;
1000: }
1001: if (local) {
1.135 djm 1002: if (channel_setup_local_fwd_listener(fwd.listen_host,
1003: fwd.listen_port, fwd.connect_host,
1004: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 1005: logit("Port forwarding failed.");
1006: goto out;
1007: }
1.135 djm 1008: } else {
1.167 markus 1009: if (channel_request_remote_forwarding(fwd.listen_host,
1.135 djm 1010: fwd.listen_port, fwd.connect_host,
1.167 markus 1011: fwd.connect_port) < 0) {
1012: logit("Port forwarding failed.");
1013: goto out;
1014: }
1.135 djm 1015: }
1016:
1.121 djm 1017: logit("Forwarding port.");
1018: }
1019:
1.97 jakob 1020: out:
1021: signal(SIGINT, handler);
1022: enter_raw_mode();
1023: if (cmd)
1024: xfree(cmd);
1025: }
1026:
1.31 markus 1027: /* process the characters one by one */
1.77 itojun 1028: static int
1.31 markus 1029: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1030: {
1.32 markus 1031: char string[1024];
1.31 markus 1032: pid_t pid;
1033: int bytes = 0;
1.42 markus 1034: u_int i;
1035: u_char ch;
1.31 markus 1036: char *s;
1037:
1.139 djm 1038: if (len <= 0)
1039: return (0);
1040:
1041: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1042: /* Get one character at a time. */
1043: ch = buf[i];
1044:
1045: if (escape_pending) {
1046: /* We have previously seen an escape character. */
1047: /* Clear the flag now. */
1048: escape_pending = 0;
1049:
1050: /* Process the escaped character. */
1051: switch (ch) {
1052: case '.':
1053: /* Terminate the connection. */
1.32 markus 1054: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1055: buffer_append(berr, string, strlen(string));
1.31 markus 1056:
1057: quit_pending = 1;
1058: return -1;
1059:
1060: case 'Z' - 64:
1061: /* Suspend the program. */
1062: /* Print a message to that effect to the user. */
1.32 markus 1063: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1064: buffer_append(berr, string, strlen(string));
1.31 markus 1065:
1066: /* Restore terminal modes and suspend. */
1067: client_suspend_self(bin, bout, berr);
1068:
1069: /* We have been continued. */
1070: continue;
1071:
1.111 markus 1072: case 'B':
1073: if (compat20) {
1074: snprintf(string, sizeof string,
1075: "%cB\r\n", escape_char);
1076: buffer_append(berr, string,
1077: strlen(string));
1078: channel_request_start(session_ident,
1079: "break", 0);
1080: packet_put_int(1000);
1081: packet_send();
1082: }
1083: continue;
1084:
1.54 markus 1085: case 'R':
1.59 markus 1086: if (compat20) {
1087: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1088: logit("Server does not support re-keying");
1.59 markus 1089: else
1090: need_rekeying = 1;
1091: }
1.54 markus 1092: continue;
1093:
1.31 markus 1094: case '&':
1095: /*
1096: * Detach the program (continue to serve connections,
1097: * but put in background and no more new connections).
1098: */
1099: /* Restore tty modes. */
1100: leave_raw_mode();
1101:
1102: /* Stop listening for new connections. */
1.86 markus 1103: channel_stop_listening();
1.31 markus 1104:
1.86 markus 1105: snprintf(string, sizeof string,
1106: "%c& [backgrounded]\n", escape_char);
1107: buffer_append(berr, string, strlen(string));
1.31 markus 1108:
1109: /* Fork into background. */
1110: pid = fork();
1111: if (pid < 0) {
1112: error("fork: %.100s", strerror(errno));
1113: continue;
1114: }
1115: if (pid != 0) { /* This is the parent. */
1116: /* The parent just exits. */
1117: exit(0);
1118: }
1119: /* The child continues serving connections. */
1.86 markus 1120: if (compat20) {
1121: buffer_append(bin, "\004", 1);
1122: /* fake EOF on stdin */
1123: return -1;
1124: } else if (!stdin_eof) {
1125: /*
1126: * Sending SSH_CMSG_EOF alone does not always appear
1127: * to be enough. So we try to send an EOF character
1128: * first.
1129: */
1130: packet_start(SSH_CMSG_STDIN_DATA);
1131: packet_put_string("\004", 1);
1132: packet_send();
1133: /* Close stdin. */
1134: stdin_eof = 1;
1135: if (buffer_len(bin) == 0) {
1136: packet_start(SSH_CMSG_EOF);
1137: packet_send();
1138: }
1139: }
1140: continue;
1.31 markus 1141:
1142: case '?':
1.32 markus 1143: snprintf(string, sizeof string,
1.31 markus 1144: "%c?\r\n\
1145: Supported escape sequences:\r\n\
1.104 stevesk 1146: %c. - terminate connection\r\n\
1.111 markus 1147: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1148: %cC - open a command line\r\n\
1149: %cR - Request rekey (SSH protocol 2 only)\r\n\
1150: %c^Z - suspend ssh\r\n\
1151: %c# - list forwarded connections\r\n\
1152: %c& - background ssh (when waiting for connections to terminate)\r\n\
1153: %c? - this message\r\n\
1154: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1155: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1156: escape_char, escape_char, escape_char, escape_char,
1157: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1158: escape_char, escape_char, escape_char);
1.32 markus 1159: buffer_append(berr, string, strlen(string));
1.31 markus 1160: continue;
1161:
1162: case '#':
1.32 markus 1163: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1164: buffer_append(berr, string, strlen(string));
1.31 markus 1165: s = channel_open_message();
1166: buffer_append(berr, s, strlen(s));
1167: xfree(s);
1.97 jakob 1168: continue;
1169:
1170: case 'C':
1.99 markus 1171: process_cmdline();
1.31 markus 1172: continue;
1173:
1174: default:
1175: if (ch != escape_char) {
1176: buffer_put_char(bin, escape_char);
1177: bytes++;
1178: }
1179: /* Escaped characters fall through here */
1180: break;
1181: }
1182: } else {
1183: /*
1184: * The previous character was not an escape char. Check if this
1185: * is an escape.
1186: */
1187: if (last_was_cr && ch == escape_char) {
1188: /* It is. Set the flag and continue to next character. */
1189: escape_pending = 1;
1190: continue;
1191: }
1192: }
1193:
1194: /*
1195: * Normal character. Record whether it was a newline,
1196: * and append it to the buffer.
1197: */
1198: last_was_cr = (ch == '\r' || ch == '\n');
1199: buffer_put_char(bin, ch);
1200: bytes++;
1201: }
1202: return bytes;
1203: }
1204:
1.77 itojun 1205: static void
1.161 deraadt 1206: client_process_input(fd_set *readset)
1.17 markus 1207: {
1.21 deraadt 1208: int len;
1.31 markus 1209: char buf[8192];
1.16 markus 1210:
1.11 markus 1211: /* Read input from stdin. */
1212: if (FD_ISSET(fileno(stdin), readset)) {
1213: /* Read as much as possible. */
1214: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1215: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1216: return; /* we'll try again later */
1.11 markus 1217: if (len <= 0) {
1.13 markus 1218: /*
1219: * Received EOF or error. They are treated
1220: * similarly, except that an error message is printed
1221: * if it was an error condition.
1222: */
1.11 markus 1223: if (len < 0) {
1224: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1225: buffer_append(&stderr_buffer, buf, strlen(buf));
1226: }
1227: /* Mark that we have seen EOF. */
1228: stdin_eof = 1;
1.13 markus 1229: /*
1230: * Send an EOF message to the server unless there is
1231: * data in the buffer. If there is data in the
1232: * buffer, no message will be sent now. Code
1233: * elsewhere will send the EOF when the buffer
1234: * becomes empty if stdin_eof is set.
1235: */
1.11 markus 1236: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1237: packet_start(SSH_CMSG_EOF);
1238: packet_send();
1.11 markus 1239: }
1.72 stevesk 1240: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1241: /*
1242: * Normal successful read, and no escape character.
1243: * Just append the data to buffer.
1244: */
1.11 markus 1245: buffer_append(&stdin_buffer, buf, len);
1246: } else {
1.13 markus 1247: /*
1248: * Normal, successful read. But we have an escape character
1249: * and have to process the characters one by one.
1250: */
1.52 markus 1251: if (process_escapes(&stdin_buffer, &stdout_buffer,
1252: &stderr_buffer, buf, len) == -1)
1.31 markus 1253: return;
1.11 markus 1254: }
1255: }
1256: }
1257:
1.77 itojun 1258: static void
1.161 deraadt 1259: client_process_output(fd_set *writeset)
1.11 markus 1260: {
1261: int len;
1262: char buf[100];
1.1 deraadt 1263:
1.11 markus 1264: /* Write buffered output to stdout. */
1265: if (FD_ISSET(fileno(stdout), writeset)) {
1266: /* Write as much data as possible. */
1267: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1268: buffer_len(&stdout_buffer));
1.11 markus 1269: if (len <= 0) {
1.64 markus 1270: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1271: len = 0;
1272: else {
1.13 markus 1273: /*
1274: * An error or EOF was encountered. Put an
1275: * error message to stderr buffer.
1276: */
1.11 markus 1277: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1278: buffer_append(&stderr_buffer, buf, strlen(buf));
1279: quit_pending = 1;
1280: return;
1281: }
1282: }
1283: /* Consume printed data from the buffer. */
1284: buffer_consume(&stdout_buffer, len);
1.57 markus 1285: stdout_bytes += len;
1.11 markus 1286: }
1287: /* Write buffered output to stderr. */
1288: if (FD_ISSET(fileno(stderr), writeset)) {
1289: /* Write as much data as possible. */
1290: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1291: buffer_len(&stderr_buffer));
1.11 markus 1292: if (len <= 0) {
1.64 markus 1293: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1294: len = 0;
1295: else {
1.13 markus 1296: /* EOF or error, but can't even print error message. */
1.11 markus 1297: quit_pending = 1;
1298: return;
1299: }
1300: }
1301: /* Consume printed characters from the buffer. */
1302: buffer_consume(&stderr_buffer, len);
1.57 markus 1303: stderr_bytes += len;
1.11 markus 1304: }
1.1 deraadt 1305: }
1306:
1.13 markus 1307: /*
1.15 markus 1308: * Get packets from the connection input buffer, and process them as long as
1309: * there are packets available.
1310: *
1311: * Any unknown packets received during the actual
1312: * session cause the session to terminate. This is
1313: * intended to make debugging easier since no
1314: * confirmations are sent. Any compatible protocol
1315: * extensions must be negotiated during the
1316: * preparatory phase.
1317: */
1318:
1.77 itojun 1319: static void
1.49 itojun 1320: client_process_buffered_input_packets(void)
1.15 markus 1321: {
1.54 markus 1322: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1323: }
1324:
1.31 markus 1325: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1326:
1.77 itojun 1327: static int
1.31 markus 1328: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1329: {
1.31 markus 1330: /* XXX we assume c->extended is writeable */
1331: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1332: }
1333:
1.77 itojun 1334: static void
1.60 markus 1335: client_channel_closed(int id, void *arg)
1336: {
1.83 markus 1337: channel_cancel_cleanup(id);
1.60 markus 1338: session_closed = 1;
1.113 markus 1339: leave_raw_mode();
1.60 markus 1340: }
1341:
1.15 markus 1342: /*
1.13 markus 1343: * Implements the interactive session with the server. This is called after
1344: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1345: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1346: * used as an escape character for terminating or suspending the session.
1.13 markus 1347: */
1.1 deraadt 1348:
1.20 markus 1349: int
1.30 markus 1350: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1351: {
1.46 markus 1352: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1353: double start_time, total_time;
1.130 avsm 1354: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1355: u_int nalloc = 0;
1.11 markus 1356: char buf[100];
1357:
1358: debug("Entering interactive session.");
1359:
1360: start_time = get_current_time();
1361:
1362: /* Initialize variables. */
1363: escape_pending = 0;
1364: last_was_cr = 1;
1365: exit_status = -1;
1366: stdin_eof = 0;
1367: buffer_high = 64 * 1024;
1368: connection_in = packet_get_connection_in();
1369: connection_out = packet_get_connection_out();
1.46 markus 1370: max_fd = MAX(connection_in, connection_out);
1.123 djm 1371: if (control_fd != -1)
1372: max_fd = MAX(max_fd, control_fd);
1.46 markus 1373:
1374: if (!compat20) {
1.63 markus 1375: /* enable nonblocking unless tty */
1376: if (!isatty(fileno(stdin)))
1377: set_nonblock(fileno(stdin));
1378: if (!isatty(fileno(stdout)))
1379: set_nonblock(fileno(stdout));
1380: if (!isatty(fileno(stderr)))
1381: set_nonblock(fileno(stderr));
1.46 markus 1382: max_fd = MAX(max_fd, fileno(stdin));
1383: max_fd = MAX(max_fd, fileno(stdout));
1384: max_fd = MAX(max_fd, fileno(stderr));
1385: }
1.11 markus 1386: stdin_bytes = 0;
1387: stdout_bytes = 0;
1388: stderr_bytes = 0;
1389: quit_pending = 0;
1390: escape_char = escape_char_arg;
1391:
1392: /* Initialize buffers. */
1393: buffer_init(&stdin_buffer);
1394: buffer_init(&stdout_buffer);
1395: buffer_init(&stderr_buffer);
1396:
1.15 markus 1397: client_init_dispatch();
1398:
1.105 markus 1399: /*
1400: * Set signal handlers, (e.g. to restore non-blocking mode)
1401: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1402: */
1.131 djm 1403: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1404: signal(SIGHUP, signal_handler);
1.105 markus 1405: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1406: signal(SIGINT, signal_handler);
1407: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1408: signal(SIGQUIT, signal_handler);
1409: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1410: signal(SIGTERM, signal_handler);
1.132 djm 1411: signal(SIGWINCH, window_change_handler);
1.11 markus 1412:
1413: if (have_pty)
1414: enter_raw_mode();
1415:
1.48 markus 1416: if (compat20) {
1417: session_ident = ssh2_chan_id;
1.72 stevesk 1418: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1419: channel_register_filter(session_ident,
1.149 reyk 1420: simple_escape_filter, NULL);
1.60 markus 1421: if (session_ident != -1)
1422: channel_register_cleanup(session_ident,
1.143 djm 1423: client_channel_closed, 0);
1.48 markus 1424: } else {
1425: /* Check if we should immediately send eof on stdin. */
1.16 markus 1426: client_check_initial_eof_on_stdin();
1.48 markus 1427: }
1.30 markus 1428:
1.11 markus 1429: /* Main loop of the client for the interactive session mode. */
1430: while (!quit_pending) {
1431:
1.13 markus 1432: /* Process buffered packets sent by the server. */
1.11 markus 1433: client_process_buffered_input_packets();
1434:
1.60 markus 1435: if (compat20 && session_closed && !channel_still_open())
1436: break;
1437:
1.56 markus 1438: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1439:
1.56 markus 1440: if (rekeying) {
1441: debug("rekeying in progress");
1442: } else {
1443: /*
1444: * Make packets of buffered stdin data, and buffer
1445: * them for sending to the server.
1446: */
1447: if (!compat20)
1448: client_make_packets_from_stdin_data();
1.11 markus 1449:
1.56 markus 1450: /*
1451: * Make packets from buffered channel data, and
1452: * enqueue them for sending to the server.
1453: */
1454: if (packet_not_very_much_data_to_write())
1455: channel_output_poll();
1.11 markus 1456:
1.56 markus 1457: /*
1458: * Check if the window size has changed, and buffer a
1459: * message about it to the server if so.
1460: */
1461: client_check_window_change();
1.11 markus 1462:
1.56 markus 1463: if (quit_pending)
1464: break;
1465: }
1.13 markus 1466: /*
1467: * Wait until we have something to do (something becomes
1468: * available on one of the descriptors).
1469: */
1.81 markus 1470: max_fd2 = max_fd;
1.56 markus 1471: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1472: &max_fd2, &nalloc, rekeying);
1.11 markus 1473:
1474: if (quit_pending)
1475: break;
1476:
1.56 markus 1477: /* Do channel operations unless rekeying in progress. */
1478: if (!rekeying) {
1479: channel_after_select(readset, writeset);
1.108 markus 1480: if (need_rekeying || packet_need_rekeying()) {
1481: debug("need rekeying");
1.56 markus 1482: xxx_kex->done = 0;
1483: kex_send_kexinit(xxx_kex);
1484: need_rekeying = 0;
1485: }
1486: }
1.11 markus 1487:
1.17 markus 1488: /* Buffer input from the connection. */
1.46 markus 1489: client_process_net_input(readset);
1.17 markus 1490:
1.123 djm 1491: /* Accept control connections. */
1492: client_process_control(readset);
1493:
1.17 markus 1494: if (quit_pending)
1495: break;
1.11 markus 1496:
1.17 markus 1497: if (!compat20) {
1498: /* Buffer data from stdin */
1.46 markus 1499: client_process_input(readset);
1.17 markus 1500: /*
1501: * Process output to stdout and stderr. Output to
1502: * the connection is processed elsewhere (above).
1503: */
1.46 markus 1504: client_process_output(writeset);
1.17 markus 1505: }
1.11 markus 1506:
1.13 markus 1507: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1508: if (FD_ISSET(connection_out, writeset))
1.11 markus 1509: packet_write_poll();
1510: }
1.46 markus 1511: if (readset)
1512: xfree(readset);
1513: if (writeset)
1514: xfree(writeset);
1.11 markus 1515:
1516: /* Terminate the session. */
1517:
1518: /* Stop watching for window change. */
1.132 djm 1519: signal(SIGWINCH, SIG_DFL);
1.11 markus 1520:
1.76 markus 1521: channel_free_all();
1.11 markus 1522:
1.75 markus 1523: if (have_pty)
1524: leave_raw_mode();
1525:
1526: /* restore blocking io */
1527: if (!isatty(fileno(stdin)))
1528: unset_nonblock(fileno(stdin));
1529: if (!isatty(fileno(stdout)))
1530: unset_nonblock(fileno(stdout));
1531: if (!isatty(fileno(stderr)))
1532: unset_nonblock(fileno(stderr));
1.116 dtucker 1533:
1534: /*
1535: * If there was no shell or command requested, there will be no remote
1536: * exit status to be returned. In that case, clear error code if the
1537: * connection was deliberately terminated at this end.
1538: */
1539: if (no_shell_flag && received_signal == SIGTERM) {
1540: received_signal = 0;
1541: exit_status = 0;
1542: }
1.75 markus 1543:
1.113 markus 1544: if (received_signal)
1.89 itojun 1545: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1546:
1.13 markus 1547: /*
1548: * In interactive mode (with pseudo tty) display a message indicating
1549: * that the connection has been closed.
1550: */
1.11 markus 1551: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1552: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1553: buffer_append(&stderr_buffer, buf, strlen(buf));
1554: }
1.70 markus 1555:
1.11 markus 1556: /* Output any buffered data for stdout. */
1.70 markus 1557: while (buffer_len(&stdout_buffer) > 0) {
1558: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1559: buffer_len(&stdout_buffer));
1.70 markus 1560: if (len <= 0) {
1.11 markus 1561: error("Write failed flushing stdout buffer.");
1.70 markus 1562: break;
1563: }
1.11 markus 1564: buffer_consume(&stdout_buffer, len);
1.57 markus 1565: stdout_bytes += len;
1.11 markus 1566: }
1567:
1568: /* Output any buffered data for stderr. */
1.70 markus 1569: while (buffer_len(&stderr_buffer) > 0) {
1570: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1571: buffer_len(&stderr_buffer));
1.70 markus 1572: if (len <= 0) {
1.11 markus 1573: error("Write failed flushing stderr buffer.");
1.70 markus 1574: break;
1575: }
1.11 markus 1576: buffer_consume(&stderr_buffer, len);
1.57 markus 1577: stderr_bytes += len;
1.11 markus 1578: }
1579:
1580: /* Clear and free any buffers. */
1581: memset(buf, 0, sizeof(buf));
1582: buffer_free(&stdin_buffer);
1583: buffer_free(&stdout_buffer);
1584: buffer_free(&stderr_buffer);
1585:
1586: /* Report bytes transferred, and transfer rates. */
1587: total_time = get_current_time() - start_time;
1588: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1589: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1590: if (total_time > 0)
1591: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1592: stdin_bytes / total_time, stdout_bytes / total_time,
1593: stderr_bytes / total_time);
1.11 markus 1594:
1595: /* Return the exit status of the program. */
1596: debug("Exit status %d", exit_status);
1597: return exit_status;
1.15 markus 1598: }
1599:
1600: /*********/
1601:
1.77 itojun 1602: static void
1.94 markus 1603: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1604: {
1.42 markus 1605: u_int data_len;
1.15 markus 1606: char *data = packet_get_string(&data_len);
1.93 markus 1607: packet_check_eom();
1.15 markus 1608: buffer_append(&stdout_buffer, data, data_len);
1609: memset(data, 0, data_len);
1610: xfree(data);
1611: }
1.77 itojun 1612: static void
1.94 markus 1613: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1614: {
1.42 markus 1615: u_int data_len;
1.15 markus 1616: char *data = packet_get_string(&data_len);
1.93 markus 1617: packet_check_eom();
1.15 markus 1618: buffer_append(&stderr_buffer, data, data_len);
1619: memset(data, 0, data_len);
1620: xfree(data);
1621: }
1.77 itojun 1622: static void
1.94 markus 1623: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1624: {
1625: exit_status = packet_get_int();
1.93 markus 1626: packet_check_eom();
1.15 markus 1627: /* Acknowledge the exit. */
1628: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1629: packet_send();
1630: /*
1631: * Must wait for packet to be sent since we are
1632: * exiting the loop.
1633: */
1634: packet_write_wait();
1635: /* Flag that we want to exit. */
1636: quit_pending = 1;
1637: }
1.115 markus 1638: static void
1639: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1640: {
1641: Channel *c = NULL;
1642: int remote_id, sock;
1643:
1644: /* Read the remote channel number from the message. */
1645: remote_id = packet_get_int();
1646: packet_check_eom();
1647:
1648: /*
1649: * Get a connection to the local authentication agent (this may again
1650: * get forwarded).
1651: */
1652: sock = ssh_get_authentication_socket();
1653:
1654: /*
1655: * If we could not connect the agent, send an error message back to
1656: * the server. This should never happen unless the agent dies,
1657: * because authentication forwarding is only enabled if we have an
1658: * agent.
1659: */
1660: if (sock >= 0) {
1661: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1662: -1, 0, 0, 0, "authentication agent connection", 1);
1663: c->remote_id = remote_id;
1664: c->force_drain = 1;
1665: }
1666: if (c == NULL) {
1667: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1668: packet_put_int(remote_id);
1669: } else {
1670: /* Send a confirmation to the remote host. */
1671: debug("Forwarding authentication connection.");
1672: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1673: packet_put_int(remote_id);
1674: packet_put_int(c->self);
1675: }
1676: packet_send();
1677: }
1.15 markus 1678:
1.77 itojun 1679: static Channel *
1.40 markus 1680: client_request_forwarded_tcpip(const char *request_type, int rchan)
1681: {
1.103 deraadt 1682: Channel *c = NULL;
1.40 markus 1683: char *listen_address, *originator_address;
1684: int listen_port, originator_port;
1.67 markus 1685: int sock;
1.40 markus 1686:
1687: /* Get rest of the packet */
1688: listen_address = packet_get_string(NULL);
1689: listen_port = packet_get_int();
1690: originator_address = packet_get_string(NULL);
1691: originator_port = packet_get_int();
1.93 markus 1692: packet_check_eom();
1.40 markus 1693:
1694: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1695: listen_address, listen_port, originator_address, originator_port);
1696:
1.80 stevesk 1697: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1698: if (sock < 0) {
1699: xfree(originator_address);
1700: xfree(listen_address);
1701: return NULL;
1702: }
1703: c = channel_new("forwarded-tcpip",
1704: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1705: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1706: originator_address, 1);
1.40 markus 1707: xfree(originator_address);
1708: xfree(listen_address);
1709: return c;
1710: }
1711:
1.103 deraadt 1712: static Channel *
1.40 markus 1713: client_request_x11(const char *request_type, int rchan)
1714: {
1715: Channel *c = NULL;
1716: char *originator;
1717: int originator_port;
1.67 markus 1718: int sock;
1.40 markus 1719:
1720: if (!options.forward_x11) {
1721: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1722: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1723: return NULL;
1724: }
1725: originator = packet_get_string(NULL);
1726: if (datafellows & SSH_BUG_X11FWD) {
1727: debug2("buggy server: x11 request w/o originator_port");
1728: originator_port = 0;
1729: } else {
1730: originator_port = packet_get_int();
1731: }
1.93 markus 1732: packet_check_eom();
1.40 markus 1733: /* XXX check permission */
1.47 markus 1734: debug("client_request_x11: request from %s %d", originator,
1735: originator_port);
1.67 markus 1736: xfree(originator);
1.40 markus 1737: sock = x11_connect_display();
1.67 markus 1738: if (sock < 0)
1739: return NULL;
1740: c = channel_new("x11",
1741: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1742: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1743: c->force_drain = 1;
1.40 markus 1744: return c;
1745: }
1746:
1.103 deraadt 1747: static Channel *
1.40 markus 1748: client_request_agent(const char *request_type, int rchan)
1749: {
1750: Channel *c = NULL;
1.67 markus 1751: int sock;
1.40 markus 1752:
1753: if (!options.forward_agent) {
1754: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1755: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1756: return NULL;
1757: }
1.177 stevesk 1758: sock = ssh_get_authentication_socket();
1.67 markus 1759: if (sock < 0)
1760: return NULL;
1761: c = channel_new("authentication agent connection",
1762: SSH_CHANNEL_OPEN, sock, sock, -1,
1763: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1764: "authentication agent connection", 1);
1.82 markus 1765: c->force_drain = 1;
1.40 markus 1766: return c;
1767: }
1768:
1.22 markus 1769: /* XXXX move to generic input handler */
1.77 itojun 1770: static void
1.94 markus 1771: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1772: {
1773: Channel *c = NULL;
1774: char *ctype;
1775: int rchan;
1.102 markus 1776: u_int rmaxpack, rwindow, len;
1.22 markus 1777:
1778: ctype = packet_get_string(&len);
1779: rchan = packet_get_int();
1780: rwindow = packet_get_int();
1781: rmaxpack = packet_get_int();
1782:
1.24 markus 1783: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1784: ctype, rchan, rwindow, rmaxpack);
1785:
1.40 markus 1786: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1787: c = client_request_forwarded_tcpip(ctype, rchan);
1788: } else if (strcmp(ctype, "x11") == 0) {
1789: c = client_request_x11(ctype, rchan);
1790: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1791: c = client_request_agent(ctype, rchan);
1.22 markus 1792: }
1793: /* XXX duplicate : */
1794: if (c != NULL) {
1795: debug("confirm %s", ctype);
1796: c->remote_id = rchan;
1797: c->remote_window = rwindow;
1798: c->remote_maxpacket = rmaxpack;
1.69 markus 1799: if (c->type != SSH_CHANNEL_CONNECTING) {
1800: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1801: packet_put_int(c->remote_id);
1802: packet_put_int(c->self);
1803: packet_put_int(c->local_window);
1804: packet_put_int(c->local_maxpacket);
1805: packet_send();
1806: }
1.22 markus 1807: } else {
1808: debug("failure %s", ctype);
1809: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1810: packet_put_int(rchan);
1811: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1812: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1813: packet_put_cstring("open failed");
1.66 markus 1814: packet_put_cstring("");
1815: }
1.22 markus 1816: packet_send();
1817: }
1818: xfree(ctype);
1819: }
1.77 itojun 1820: static void
1.94 markus 1821: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1822: {
1823: Channel *c = NULL;
1.123 djm 1824: int exitval, id, reply, success = 0;
1.48 markus 1825: char *rtype;
1826:
1827: id = packet_get_int();
1828: rtype = packet_get_string(NULL);
1829: reply = packet_get_char();
1830:
1831: debug("client_input_channel_req: channel %d rtype %s reply %d",
1832: id, rtype, reply);
1833:
1.128 djm 1834: if (id == -1) {
1835: error("client_input_channel_req: request for channel -1");
1836: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1837: error("client_input_channel_req: channel %d: unknown channel", id);
1838: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1839: exitval = packet_get_int();
1840: if (id == session_ident) {
1841: success = 1;
1842: exit_status = exitval;
1843: } else if (c->ctl_fd == -1) {
1844: error("client_input_channel_req: unexpected channel %d",
1845: session_ident);
1846: } else {
1847: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1848: success = 1;
1849: }
1.93 markus 1850: packet_check_eom();
1.48 markus 1851: }
1852: if (reply) {
1853: packet_start(success ?
1854: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1855: packet_put_int(id);
1.48 markus 1856: packet_send();
1857: }
1858: xfree(rtype);
1859: }
1.95 markus 1860: static void
1861: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1862: {
1863: char *rtype;
1864: int want_reply;
1865: int success = 0;
1866:
1867: rtype = packet_get_string(NULL);
1868: want_reply = packet_get_char();
1.117 markus 1869: debug("client_input_global_request: rtype %s want_reply %d",
1870: rtype, want_reply);
1.95 markus 1871: if (want_reply) {
1872: packet_start(success ?
1873: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1874: packet_send();
1875: packet_write_wait();
1876: }
1877: xfree(rtype);
1878: }
1.22 markus 1879:
1.123 djm 1880: void
1.129 deraadt 1881: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1882: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1883: dispatch_fn *subsys_repl)
1884: {
1885: int len;
1.132 djm 1886: Channel *c = NULL;
1.123 djm 1887:
1888: debug2("%s: id %d", __func__, id);
1889:
1.132 djm 1890: if ((c = channel_lookup(id)) == NULL)
1891: fatal("client_session2_setup: channel %d: unknown channel", id);
1892:
1.123 djm 1893: if (want_tty) {
1894: struct winsize ws;
1895: struct termios tio;
1896:
1897: /* Store window size in the packet. */
1898: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1899: memset(&ws, 0, sizeof(ws));
1900:
1901: channel_request_start(id, "pty-req", 0);
1902: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1903: packet_put_int((u_int)ws.ws_col);
1904: packet_put_int((u_int)ws.ws_row);
1905: packet_put_int((u_int)ws.ws_xpixel);
1906: packet_put_int((u_int)ws.ws_ypixel);
1.123 djm 1907: tio = get_saved_tio();
1908: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1909: packet_send();
1910: /* XXX wait for reply */
1.132 djm 1911: c->client_tty = 1;
1.123 djm 1912: }
1913:
1914: /* Transfer any environment variables from client to server */
1.126 djm 1915: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1916: int i, j, matched;
1917: char *name, *val;
1918:
1919: debug("Sending environment.");
1.126 djm 1920: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1921: /* Split */
1.126 djm 1922: name = xstrdup(env[i]);
1.123 djm 1923: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1924: xfree(name);
1.123 djm 1925: continue;
1926: }
1927: *val++ = '\0';
1928:
1929: matched = 0;
1930: for (j = 0; j < options.num_send_env; j++) {
1931: if (match_pattern(name, options.send_env[j])) {
1932: matched = 1;
1933: break;
1934: }
1935: }
1936: if (!matched) {
1937: debug3("Ignored env %s", name);
1.144 stevesk 1938: xfree(name);
1.123 djm 1939: continue;
1940: }
1941:
1942: debug("Sending env %s = %s", name, val);
1943: channel_request_start(id, "env", 0);
1944: packet_put_cstring(name);
1945: packet_put_cstring(val);
1946: packet_send();
1.144 stevesk 1947: xfree(name);
1.123 djm 1948: }
1949: }
1950:
1951: len = buffer_len(cmd);
1952: if (len > 0) {
1953: if (len > 900)
1954: len = 900;
1955: if (want_subsystem) {
1956: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1957: channel_request_start(id, "subsystem", subsys_repl != NULL);
1958: if (subsys_repl != NULL) {
1959: /* register callback for reply */
1960: /* XXX we assume that client_loop has already been called */
1961: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1962: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1963: }
1964: } else {
1965: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1966: channel_request_start(id, "exec", 0);
1967: }
1968: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1969: packet_send();
1970: } else {
1971: channel_request_start(id, "shell", 0);
1972: packet_send();
1973: }
1974: }
1975:
1.77 itojun 1976: static void
1.49 itojun 1977: client_init_dispatch_20(void)
1.16 markus 1978: {
1.55 markus 1979: dispatch_init(&dispatch_protocol_error);
1.100 markus 1980:
1.16 markus 1981: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1982: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1983: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1984: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1985: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1986: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1987: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1988: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1989: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1990: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1991:
1992: /* rekeying */
1993: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1994:
1995: /* global request reply messages */
1996: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1997: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1998: }
1.77 itojun 1999: static void
1.49 itojun 2000: client_init_dispatch_13(void)
1.15 markus 2001: {
2002: dispatch_init(NULL);
2003: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2004: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2005: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2006: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2007: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2008: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2009: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2010: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2011: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2012:
2013: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2014: &client_input_agent_open : &deny_input_open);
1.39 markus 2015: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2016: &x11_input_open : &deny_input_open);
1.15 markus 2017: }
1.77 itojun 2018: static void
1.49 itojun 2019: client_init_dispatch_15(void)
1.15 markus 2020: {
2021: client_init_dispatch_13();
2022: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2023: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2024: }
1.79 stevesk 2025: static void
1.49 itojun 2026: client_init_dispatch(void)
1.15 markus 2027: {
1.16 markus 2028: if (compat20)
2029: client_init_dispatch_20();
2030: else if (compat13)
1.15 markus 2031: client_init_dispatch_13();
2032: else
2033: client_init_dispatch_15();
1.113 markus 2034: }
2035:
2036: /* client specific fatal cleanup */
2037: void
1.114 markus 2038: cleanup_exit(int i)
1.113 markus 2039: {
2040: leave_raw_mode();
2041: leave_non_blocking();
1.123 djm 2042: if (options.control_path != NULL && control_fd != -1)
2043: unlink(options.control_path);
1.114 markus 2044: _exit(i);
1.1 deraadt 2045: }