Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.166
1.166 ! stevesk 1: /* $OpenBSD: clientloop.c,v 1.165 2006/07/02 23:01:55 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>
1.151 stevesk 70: #include <paths.h>
1.153 stevesk 71: #include <signal.h>
1.150 stevesk 72: #include <termios.h>
1.1 deraadt 73:
1.45 markus 74: #include "ssh.h"
75: #include "ssh1.h"
76: #include "ssh2.h"
1.1 deraadt 77: #include "xmalloc.h"
78: #include "packet.h"
79: #include "buffer.h"
1.15 markus 80: #include "compat.h"
1.74 markus 81: #include "channels.h"
1.15 markus 82: #include "dispatch.h"
1.30 markus 83: #include "buffer.h"
84: #include "bufaux.h"
1.40 markus 85: #include "key.h"
1.54 markus 86: #include "kex.h"
1.45 markus 87: #include "log.h"
88: #include "readconf.h"
89: #include "clientloop.h"
1.147 djm 90: #include "sshconnect.h"
1.40 markus 91: #include "authfd.h"
1.45 markus 92: #include "atomicio.h"
1.118 deraadt 93: #include "sshpty.h"
1.63 markus 94: #include "misc.h"
1.123 djm 95: #include "monitor_fdpass.h"
96: #include "match.h"
97: #include "msg.h"
1.39 markus 98:
99: /* import options */
100: extern Options options;
101:
1.1 deraadt 102: /* Flag indicating that stdin should be redirected from /dev/null. */
103: extern int stdin_null_flag;
104:
1.116 dtucker 105: /* Flag indicating that no shell has been requested */
106: extern int no_shell_flag;
107:
1.123 djm 108: /* Control socket */
109: extern int control_fd;
110:
1.13 markus 111: /*
112: * Name of the host we are connecting to. This is the name given on the
113: * command line, or the HostName specified for the user-supplied name in a
114: * configuration file.
115: */
1.1 deraadt 116: extern char *host;
117:
1.13 markus 118: /*
119: * Flag to indicate that we have received a window change signal which has
120: * not yet been processed. This will cause a message indicating the new
121: * window size to be sent to the server a little later. This is volatile
122: * because this is updated in a signal handler.
123: */
1.88 markus 124: static volatile sig_atomic_t received_window_change_signal = 0;
125: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 126:
1.145 djm 127: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 128: static int in_non_blocking_mode = 0;
129:
130: /* Common data for the client loop code. */
1.162 djm 131: static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.31 markus 132: static int escape_char; /* Escape character. */
1.11 markus 133: static int escape_pending; /* Last character was the escape character */
134: static int last_was_cr; /* Last character was a newline. */
135: static int exit_status; /* Used to store the exit status of the command. */
136: static int stdin_eof; /* EOF has been encountered on standard error. */
137: static Buffer stdin_buffer; /* Buffer for stdin data. */
138: static Buffer stdout_buffer; /* Buffer for stdout data. */
139: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 140: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
141: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 142: static int connection_in; /* Connection to server (input). */
143: static int connection_out; /* Connection to server (output). */
1.56 markus 144: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 145: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 146: static int server_alive_timeouts = 0;
1.1 deraadt 147:
1.77 itojun 148: static void client_init_dispatch(void);
1.16 markus 149: int session_ident = -1;
150:
1.123 djm 151: struct confirm_ctx {
152: int want_tty;
153: int want_subsys;
1.140 djm 154: int want_x_fwd;
155: int want_agent_fwd;
1.123 djm 156: Buffer cmd;
157: char *term;
158: struct termios tio;
1.126 djm 159: char **env;
1.123 djm 160: };
161:
1.54 markus 162: /*XXX*/
163: extern Kex *xxx_kex;
164:
1.123 djm 165: void ssh_process_session2_setup(int, int, int, Buffer *);
166:
1.1 deraadt 167: /* Restores stdin to blocking mode. */
168:
1.77 itojun 169: static void
1.49 itojun 170: leave_non_blocking(void)
1.1 deraadt 171: {
1.11 markus 172: if (in_non_blocking_mode) {
1.125 djm 173: unset_nonblock(fileno(stdin));
1.11 markus 174: in_non_blocking_mode = 0;
175: }
1.1 deraadt 176: }
177:
1.11 markus 178: /* Puts stdin terminal in non-blocking mode. */
179:
1.77 itojun 180: static void
1.49 itojun 181: enter_non_blocking(void)
1.1 deraadt 182: {
1.11 markus 183: in_non_blocking_mode = 1;
1.124 djm 184: set_nonblock(fileno(stdin));
1.1 deraadt 185: }
186:
1.13 markus 187: /*
188: * Signal handler for the window change signal (SIGWINCH). This just sets a
189: * flag indicating that the window has changed.
190: */
1.157 deraadt 191: /*ARGSUSED */
1.77 itojun 192: static void
1.11 markus 193: window_change_handler(int sig)
1.1 deraadt 194: {
1.11 markus 195: received_window_change_signal = 1;
196: signal(SIGWINCH, window_change_handler);
1.1 deraadt 197: }
198:
1.13 markus 199: /*
200: * Signal handler for signals that cause the program to terminate. These
201: * signals must be trapped to restore terminal modes.
202: */
1.157 deraadt 203: /*ARGSUSED */
1.77 itojun 204: static void
1.11 markus 205: signal_handler(int sig)
1.1 deraadt 206: {
1.75 markus 207: received_signal = sig;
208: quit_pending = 1;
1.1 deraadt 209: }
210:
1.13 markus 211: /*
212: * Returns current time in seconds from Jan 1, 1970 with the maximum
213: * available resolution.
214: */
1.1 deraadt 215:
1.77 itojun 216: static double
1.49 itojun 217: get_current_time(void)
1.1 deraadt 218: {
1.11 markus 219: struct timeval tv;
220: gettimeofday(&tv, NULL);
221: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 222: }
223:
224: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
225: void
226: client_x11_get_proto(const char *display, const char *xauth_path,
227: u_int trusted, char **_proto, char **_data)
228: {
229: char cmd[1024];
230: char line[512];
231: char xdisplay[512];
232: static char proto[512], data[512];
233: FILE *f;
234: int got_data = 0, generated = 0, do_unlink = 0, i;
235: char *xauthdir, *xauthfile;
236: struct stat st;
237:
238: xauthdir = xauthfile = NULL;
239: *_proto = proto;
240: *_data = data;
241: proto[0] = data[0] = '\0';
242:
243: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
244: debug("No xauth program.");
245: } else {
246: if (display == NULL) {
247: debug("x11_get_proto: DISPLAY not set");
248: return;
249: }
250: /*
251: * Handle FamilyLocal case where $DISPLAY does
252: * not match an authorization entry. For this we
253: * just try "xauth list unix:displaynum.screennum".
254: * XXX: "localhost" match to determine FamilyLocal
255: * is not perfect.
256: */
257: if (strncmp(display, "localhost:", 10) == 0) {
258: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
259: display + 10);
260: display = xdisplay;
261: }
262: if (trusted == 0) {
263: xauthdir = xmalloc(MAXPATHLEN);
264: xauthfile = xmalloc(MAXPATHLEN);
265: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
266: if (mkdtemp(xauthdir) != NULL) {
267: do_unlink = 1;
268: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
269: xauthdir);
270: snprintf(cmd, sizeof(cmd),
271: "%s -f %s generate %s " SSH_X11_PROTO
272: " untrusted timeout 1200 2>" _PATH_DEVNULL,
273: xauth_path, xauthfile, display);
274: debug2("x11_get_proto: %s", cmd);
275: if (system(cmd) == 0)
276: generated = 1;
277: }
278: }
279: snprintf(cmd, sizeof(cmd),
1.142 markus 280: "%s %s%s list %s 2>" _PATH_DEVNULL,
1.138 djm 281: xauth_path,
282: generated ? "-f " : "" ,
283: generated ? xauthfile : "",
284: display);
285: debug2("x11_get_proto: %s", cmd);
286: f = popen(cmd, "r");
287: if (f && fgets(line, sizeof(line), f) &&
288: sscanf(line, "%*s %511s %511s", proto, data) == 2)
289: got_data = 1;
290: if (f)
291: pclose(f);
292: }
293:
294: if (do_unlink) {
295: unlink(xauthfile);
296: rmdir(xauthdir);
297: }
298: if (xauthdir)
299: xfree(xauthdir);
300: if (xauthfile)
301: xfree(xauthfile);
302:
303: /*
304: * If we didn't get authentication data, just make up some
305: * data. The forwarding code will check the validity of the
306: * response anyway, and substitute this data. The X11
307: * server, however, will ignore this fake data and use
308: * whatever authentication mechanisms it was using otherwise
309: * for the local connection.
310: */
311: if (!got_data) {
312: u_int32_t rnd = 0;
313:
314: logit("Warning: No xauth data; "
315: "using fake authentication data for X11 forwarding.");
316: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
317: for (i = 0; i < 16; i++) {
318: if (i % 4 == 0)
319: rnd = arc4random();
320: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
321: rnd & 0xff);
322: rnd >>= 8;
323: }
324: }
1.1 deraadt 325: }
326:
1.13 markus 327: /*
328: * This is called when the interactive is entered. This checks if there is
329: * an EOF coming on stdin. We must check this explicitly, as select() does
330: * not appear to wake up when redirecting from /dev/null.
331: */
1.1 deraadt 332:
1.77 itojun 333: static void
1.49 itojun 334: client_check_initial_eof_on_stdin(void)
1.1 deraadt 335: {
1.11 markus 336: int len;
337: char buf[1];
1.1 deraadt 338:
1.13 markus 339: /*
340: * If standard input is to be "redirected from /dev/null", we simply
341: * mark that we have seen an EOF and send an EOF message to the
342: * server. Otherwise, we try to read a single character; it appears
343: * that for some files, such /dev/null, select() never wakes up for
344: * read for this descriptor, which means that we never get EOF. This
345: * way we will get the EOF if stdin comes from /dev/null or similar.
346: */
1.11 markus 347: if (stdin_null_flag) {
348: /* Fake EOF on stdin. */
349: debug("Sending eof.");
350: stdin_eof = 1;
351: packet_start(SSH_CMSG_EOF);
352: packet_send();
353: } else {
354: enter_non_blocking();
355:
356: /* Check for immediate EOF on stdin. */
357: len = read(fileno(stdin), buf, 1);
358: if (len == 0) {
1.13 markus 359: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 360: debug("Sending eof.");
361: stdin_eof = 1;
362: packet_start(SSH_CMSG_EOF);
363: packet_send();
364: } else if (len > 0) {
1.13 markus 365: /*
366: * Got data. We must store the data in the buffer,
367: * and also process it as an escape character if
368: * appropriate.
369: */
1.42 markus 370: if ((u_char) buf[0] == escape_char)
1.11 markus 371: escape_pending = 1;
1.52 markus 372: else
1.11 markus 373: buffer_append(&stdin_buffer, buf, 1);
374: }
375: leave_non_blocking();
376: }
1.1 deraadt 377: }
378:
379:
1.13 markus 380: /*
381: * Make packets from buffered stdin data, and buffer them for sending to the
382: * connection.
383: */
1.1 deraadt 384:
1.77 itojun 385: static void
1.49 itojun 386: client_make_packets_from_stdin_data(void)
1.1 deraadt 387: {
1.42 markus 388: u_int len;
1.1 deraadt 389:
1.11 markus 390: /* Send buffered stdin data to the server. */
391: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 392: packet_not_very_much_data_to_write()) {
1.11 markus 393: len = buffer_len(&stdin_buffer);
394: /* Keep the packets at reasonable size. */
395: if (len > packet_get_maxsize())
396: len = packet_get_maxsize();
397: packet_start(SSH_CMSG_STDIN_DATA);
398: packet_put_string(buffer_ptr(&stdin_buffer), len);
399: packet_send();
400: buffer_consume(&stdin_buffer, len);
1.52 markus 401: stdin_bytes += len;
1.11 markus 402: /* If we have a pending EOF, send it now. */
403: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
404: packet_start(SSH_CMSG_EOF);
405: packet_send();
406: }
1.1 deraadt 407: }
408: }
409:
1.13 markus 410: /*
411: * Checks if the client window has changed, and sends a packet about it to
412: * the server if so. The actual change is detected elsewhere (by a software
413: * interrupt on Unix); this just checks the flag and sends a message if
414: * appropriate.
415: */
1.1 deraadt 416:
1.77 itojun 417: static void
1.49 itojun 418: client_check_window_change(void)
1.1 deraadt 419: {
1.16 markus 420: struct winsize ws;
421:
422: if (! received_window_change_signal)
423: return;
424: /** XXX race */
425: received_window_change_signal = 0;
426:
1.37 markus 427: debug2("client_check_window_change: changed");
1.16 markus 428:
429: if (compat20) {
1.123 djm 430: channel_send_window_changes();
1.16 markus 431: } else {
1.123 djm 432: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
433: return;
1.16 markus 434: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 435: packet_put_int((u_int)ws.ws_row);
436: packet_put_int((u_int)ws.ws_col);
437: packet_put_int((u_int)ws.ws_xpixel);
438: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 439: packet_send();
1.1 deraadt 440: }
441: }
442:
1.117 markus 443: static void
444: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
445: {
446: server_alive_timeouts = 0;
447: client_global_request_reply_fwd(type, seq, ctxt);
448: }
449:
450: static void
451: server_alive_check(void)
452: {
453: if (++server_alive_timeouts > options.server_alive_count_max)
454: packet_disconnect("Timeout, server not responding.");
455: packet_start(SSH2_MSG_GLOBAL_REQUEST);
456: packet_put_cstring("keepalive@openssh.com");
457: packet_put_char(1); /* boolean: want reply */
458: packet_send();
459: }
460:
1.13 markus 461: /*
462: * Waits until the client can do something (some data becomes available on
463: * one of the file descriptors).
464: */
1.77 itojun 465: static void
1.46 markus 466: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 467: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 468: {
1.117 markus 469: struct timeval tv, *tvp;
470: int ret;
471:
1.46 markus 472: /* Add any selections by the channel mechanism. */
1.81 markus 473: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 474:
1.16 markus 475: if (!compat20) {
1.17 markus 476: /* Read from the connection, unless our buffers are full. */
1.16 markus 477: if (buffer_len(&stdout_buffer) < buffer_high &&
478: buffer_len(&stderr_buffer) < buffer_high &&
479: channel_not_very_much_buffered_data())
1.46 markus 480: FD_SET(connection_in, *readsetp);
1.17 markus 481: /*
482: * Read from stdin, unless we have seen EOF or have very much
483: * buffered data to send to the server.
484: */
485: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 486: FD_SET(fileno(stdin), *readsetp);
1.17 markus 487:
488: /* Select stdout/stderr if have data in buffer. */
489: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 490: FD_SET(fileno(stdout), *writesetp);
1.17 markus 491: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 492: FD_SET(fileno(stderr), *writesetp);
1.16 markus 493: } else {
1.71 markus 494: /* channel_prepare_select could have closed the last channel */
1.84 markus 495: if (session_closed && !channel_still_open() &&
496: !packet_have_data_to_write()) {
497: /* clear mask since we did not call select() */
1.87 markus 498: memset(*readsetp, 0, *nallocp);
499: memset(*writesetp, 0, *nallocp);
1.84 markus 500: return;
1.71 markus 501: } else {
502: FD_SET(connection_in, *readsetp);
503: }
1.16 markus 504: }
1.11 markus 505:
506: /* Select server connection if have data to write to the server. */
507: if (packet_have_data_to_write())
1.46 markus 508: FD_SET(connection_out, *writesetp);
1.11 markus 509:
1.123 djm 510: if (control_fd != -1)
511: FD_SET(control_fd, *readsetp);
512:
1.13 markus 513: /*
514: * Wait for something to happen. This will suspend the process until
515: * some selected descriptor can be read, written, or has some other
1.117 markus 516: * event pending.
1.13 markus 517: */
1.11 markus 518:
1.117 markus 519: if (options.server_alive_interval == 0 || !compat20)
520: tvp = NULL;
1.129 deraadt 521: else {
1.117 markus 522: tv.tv_sec = options.server_alive_interval;
523: tv.tv_usec = 0;
524: tvp = &tv;
525: }
526: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
527: if (ret < 0) {
1.11 markus 528: char buf[100];
1.51 markus 529:
530: /*
531: * We have to clear the select masks, because we return.
532: * We have to return, because the mainloop checks for the flags
533: * set by the signal handlers.
534: */
1.87 markus 535: memset(*readsetp, 0, *nallocp);
536: memset(*writesetp, 0, *nallocp);
1.50 deraadt 537:
1.11 markus 538: if (errno == EINTR)
539: return;
540: /* Note: we might still have data in the buffers. */
541: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
542: buffer_append(&stderr_buffer, buf, strlen(buf));
543: quit_pending = 1;
1.117 markus 544: } else if (ret == 0)
545: server_alive_check();
1.11 markus 546: }
547:
1.77 itojun 548: static void
1.31 markus 549: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 550: {
1.11 markus 551: /* Flush stdout and stderr buffers. */
1.31 markus 552: if (buffer_len(bout) > 0)
1.112 deraadt 553: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 554: if (buffer_len(berr) > 0)
1.112 deraadt 555: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 556:
557: leave_raw_mode();
558:
1.13 markus 559: /*
560: * Free (and clear) the buffer to reduce the amount of data that gets
561: * written to swap.
562: */
1.31 markus 563: buffer_free(bin);
564: buffer_free(bout);
565: buffer_free(berr);
1.11 markus 566:
567: /* Send the suspend signal to the program itself. */
568: kill(getpid(), SIGTSTP);
569:
1.132 djm 570: /* Reset window sizes in case they have changed */
571: received_window_change_signal = 1;
1.11 markus 572:
573: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 574: buffer_init(bin);
575: buffer_init(bout);
576: buffer_init(berr);
1.11 markus 577:
578: enter_raw_mode();
579: }
580:
1.77 itojun 581: static void
1.161 deraadt 582: client_process_net_input(fd_set *readset)
1.11 markus 583: {
1.17 markus 584: int len;
585: char buf[8192];
1.11 markus 586:
1.13 markus 587: /*
588: * Read input from the server, and add any such data to the buffer of
589: * the packet subsystem.
590: */
1.11 markus 591: if (FD_ISSET(connection_in, readset)) {
592: /* Read as much as possible. */
593: len = read(connection_in, buf, sizeof(buf));
594: if (len == 0) {
595: /* Received EOF. The remote host has closed the connection. */
596: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
597: host);
1.1 deraadt 598: buffer_append(&stderr_buffer, buf, strlen(buf));
599: quit_pending = 1;
600: return;
1.11 markus 601: }
1.13 markus 602: /*
603: * There is a kernel bug on Solaris that causes select to
604: * sometimes wake up even though there is no data available.
605: */
1.53 millert 606: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 607: len = 0;
608:
609: if (len < 0) {
610: /* An error has encountered. Perhaps there is a network problem. */
611: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
612: host, strerror(errno));
613: buffer_append(&stderr_buffer, buf, strlen(buf));
614: quit_pending = 1;
615: return;
616: }
617: packet_process_incoming(buf, len);
618: }
1.17 markus 619: }
1.16 markus 620:
1.97 jakob 621: static void
1.123 djm 622: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
623: {
624: int id;
625: Channel *c;
1.129 deraadt 626:
1.123 djm 627: id = packet_get_int();
628: packet_check_eom();
629:
630: if ((c = channel_lookup(id)) == NULL) {
631: error("%s: no channel for id %d", __func__, id);
632: return;
633: }
634:
635: if (type == SSH2_MSG_CHANNEL_SUCCESS)
636: debug2("Request suceeded on channel %d", id);
637: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
638: error("Request failed on channel %d", id);
639: channel_free(c);
640: }
641: }
642:
643: static void
644: client_extra_session2_setup(int id, void *arg)
645: {
646: struct confirm_ctx *cctx = arg;
1.140 djm 647: const char *display;
1.123 djm 648: Channel *c;
1.126 djm 649: int i;
1.129 deraadt 650:
1.123 djm 651: if (cctx == NULL)
652: fatal("%s: cctx == NULL", __func__);
653: if ((c = channel_lookup(id)) == NULL)
654: fatal("%s: no channel for id %d", __func__, id);
655:
1.141 djm 656: display = getenv("DISPLAY");
1.140 djm 657: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
658: char *proto, *data;
659: /* Get reasonable local authentication information. */
660: client_x11_get_proto(display, options.xauth_location,
661: options.forward_x11_trusted, &proto, &data);
662: /* Request forwarding with authentication spoofing. */
663: debug("Requesting X11 forwarding with authentication spoofing.");
664: x11_request_forwarding_with_spoofing(id, display, proto, data);
665: /* XXX wait for reply */
666: }
667:
668: if (cctx->want_agent_fwd && options.forward_agent) {
669: debug("Requesting authentication agent forwarding.");
670: channel_request_start(id, "auth-agent-req@openssh.com", 0);
671: packet_send();
672: }
673:
1.129 deraadt 674: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 675: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 676: client_subsystem_reply);
1.127 djm 677:
1.123 djm 678: c->confirm_ctx = NULL;
679: buffer_free(&cctx->cmd);
1.126 djm 680: xfree(cctx->term);
681: if (cctx->env != NULL) {
682: for (i = 0; cctx->env[i] != NULL; i++)
683: xfree(cctx->env[i]);
684: xfree(cctx->env);
1.129 deraadt 685: }
1.126 djm 686: xfree(cctx);
1.123 djm 687: }
688:
689: static void
1.161 deraadt 690: client_process_control(fd_set *readset)
1.123 djm 691: {
692: Buffer m;
693: Channel *c;
1.139 djm 694: int client_fd, new_fd[3], ver, allowed;
1.123 djm 695: socklen_t addrlen;
696: struct sockaddr_storage addr;
697: struct confirm_ctx *cctx;
698: char *cmd;
1.139 djm 699: u_int i, len, env_len, command, flags;
1.123 djm 700: uid_t euid;
701: gid_t egid;
702:
703: /*
704: * Accept connection on control socket
705: */
706: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
707: return;
708:
709: memset(&addr, 0, sizeof(addr));
710: addrlen = sizeof(addr);
711: if ((client_fd = accept(control_fd,
712: (struct sockaddr*)&addr, &addrlen)) == -1) {
713: error("%s accept: %s", __func__, strerror(errno));
714: return;
715: }
716:
717: if (getpeereid(client_fd, &euid, &egid) < 0) {
718: error("%s getpeereid failed: %s", __func__, strerror(errno));
719: close(client_fd);
720: return;
721: }
722: if ((euid != 0) && (getuid() != euid)) {
723: error("control mode uid mismatch: peer euid %u != uid %u",
724: (u_int) euid, (u_int) getuid());
725: close(client_fd);
726: return;
727: }
1.127 djm 728:
1.134 djm 729: unset_nonblock(client_fd);
730:
731: /* Read command */
732: buffer_init(&m);
733: if (ssh_msg_recv(client_fd, &m) == -1) {
734: error("%s: client msg_recv failed", __func__);
735: close(client_fd);
736: buffer_free(&m);
737: return;
738: }
1.140 djm 739: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 740: error("%s: wrong client version %d", __func__, ver);
741: buffer_free(&m);
742: close(client_fd);
743: return;
744: }
745:
1.127 djm 746: allowed = 1;
1.134 djm 747: command = buffer_get_int(&m);
748: flags = buffer_get_int(&m);
1.123 djm 749:
1.134 djm 750: buffer_clear(&m);
1.123 djm 751:
1.134 djm 752: switch (command) {
753: case SSHMUX_COMMAND_OPEN:
1.137 djm 754: if (options.control_master == SSHCTL_MASTER_ASK ||
755: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 756: allowed = ask_permission("Allow shared connection "
757: "to %s? ", host);
758: /* continue below */
759: break;
760: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 761: if (options.control_master == SSHCTL_MASTER_ASK ||
762: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 763: allowed = ask_permission("Terminate shared connection "
764: "to %s? ", host);
765: if (allowed)
766: quit_pending = 1;
1.136 deraadt 767: /* FALLTHROUGH */
1.134 djm 768: case SSHMUX_COMMAND_ALIVE_CHECK:
769: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
770: buffer_clear(&m);
771: buffer_put_int(&m, allowed);
772: buffer_put_int(&m, getpid());
1.140 djm 773: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 774: error("%s: client msg_send failed", __func__);
775: close(client_fd);
776: buffer_free(&m);
777: return;
778: }
779: buffer_free(&m);
780: close(client_fd);
781: return;
782: default:
783: error("Unsupported command %d", command);
784: buffer_free(&m);
785: close(client_fd);
786: return;
787: }
1.123 djm 788:
1.134 djm 789: /* Reply for SSHMUX_COMMAND_OPEN */
790: buffer_clear(&m);
1.127 djm 791: buffer_put_int(&m, allowed);
1.123 djm 792: buffer_put_int(&m, getpid());
1.140 djm 793: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 794: error("%s: client msg_send failed", __func__);
795: close(client_fd);
1.127 djm 796: buffer_free(&m);
1.123 djm 797: return;
798: }
799:
1.127 djm 800: if (!allowed) {
801: error("Refused control connection");
802: close(client_fd);
803: buffer_free(&m);
804: return;
805: }
806:
1.134 djm 807: buffer_clear(&m);
1.123 djm 808: if (ssh_msg_recv(client_fd, &m) == -1) {
809: error("%s: client msg_recv failed", __func__);
810: close(client_fd);
1.127 djm 811: buffer_free(&m);
1.123 djm 812: return;
813: }
1.140 djm 814: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 815: error("%s: wrong client version %d", __func__, ver);
816: buffer_free(&m);
817: close(client_fd);
818: return;
819: }
820:
1.159 djm 821: cctx = xcalloc(1, sizeof(*cctx));
1.134 djm 822: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
823: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 824: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
825: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 826: cctx->term = buffer_get_string(&m, &len);
827:
828: cmd = buffer_get_string(&m, &len);
829: buffer_init(&cctx->cmd);
830: buffer_append(&cctx->cmd, cmd, strlen(cmd));
831:
1.126 djm 832: env_len = buffer_get_int(&m);
833: env_len = MIN(env_len, 4096);
834: debug3("%s: receiving %d env vars", __func__, env_len);
835: if (env_len != 0) {
1.159 djm 836: cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
1.126 djm 837: for (i = 0; i < env_len; i++)
838: cctx->env[i] = buffer_get_string(&m, &len);
839: cctx->env[i] = NULL;
840: }
841:
1.123 djm 842: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
843: cctx->want_tty, cctx->want_subsys, cmd);
1.163 markus 844: xfree(cmd);
1.123 djm 845:
846: /* Gather fds from client */
847: new_fd[0] = mm_receive_fd(client_fd);
848: new_fd[1] = mm_receive_fd(client_fd);
849: new_fd[2] = mm_receive_fd(client_fd);
850:
851: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
852: new_fd[0], new_fd[1], new_fd[2]);
853:
854: /* Try to pick up ttymodes from client before it goes raw */
855: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
856: error("%s: tcgetattr: %s", __func__, strerror(errno));
857:
1.134 djm 858: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 859: buffer_clear(&m);
1.140 djm 860: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 861: error("%s: client msg_send failed", __func__);
862: close(client_fd);
863: close(new_fd[0]);
864: close(new_fd[1]);
865: close(new_fd[2]);
1.127 djm 866: buffer_free(&m);
1.134 djm 867: xfree(cctx->term);
868: if (env_len != 0) {
869: for (i = 0; i < env_len; i++)
870: xfree(cctx->env[i]);
871: xfree(cctx->env);
872: }
1.123 djm 873: return;
874: }
875: buffer_free(&m);
876:
877: /* enable nonblocking unless tty */
878: if (!isatty(new_fd[0]))
879: set_nonblock(new_fd[0]);
880: if (!isatty(new_fd[1]))
881: set_nonblock(new_fd[1]);
882: if (!isatty(new_fd[2]))
883: set_nonblock(new_fd[2]);
884:
885: set_nonblock(client_fd);
886:
1.129 deraadt 887: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 888: new_fd[0], new_fd[1], new_fd[2],
889: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
890: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
891:
892: /* XXX */
893: c->ctl_fd = client_fd;
894:
895: debug3("%s: channel_new: %d", __func__, c->self);
896:
897: channel_send_open(c->self);
898: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
899: }
900:
901: static void
1.99 markus 902: process_cmdline(void)
1.97 jakob 903: {
904: void (*handler)(int);
1.135 djm 905: char *s, *cmd, *cancel_host;
1.121 djm 906: int delete = 0;
1.97 jakob 907: int local = 0;
1.135 djm 908: u_short cancel_port;
909: Forward fwd;
1.97 jakob 910:
911: leave_raw_mode();
1.101 markus 912: handler = signal(SIGINT, SIG_IGN);
1.99 markus 913: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 914: if (s == NULL)
915: goto out;
916: while (*s && isspace(*s))
917: s++;
1.121 djm 918: if (*s == '-')
919: s++; /* Skip cmdline '-', if any */
1.120 dtucker 920: if (*s == '\0')
1.97 jakob 921: goto out;
1.121 djm 922:
1.122 djm 923: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 924: logit("Commands:");
1.164 djm 925: logit(" -L[bind_address:]port:host:hostport "
926: "Request local forward");
927: logit(" -R[bind_address:]port:host:hostport "
928: "Request remote forward");
1.165 stevesk 929: logit(" -KR[bind_address:]port "
1.164 djm 930: "Cancel remote forward");
1.146 reyk 931: if (!options.permit_local_command)
932: goto out;
1.164 djm 933: logit(" !args "
934: "Execute local command");
1.146 reyk 935: goto out;
936: }
937:
938: if (*s == '!' && options.permit_local_command) {
939: s++;
940: ssh_local_cmd(s);
1.121 djm 941: goto out;
942: }
943:
944: if (*s == 'K') {
945: delete = 1;
946: s++;
947: }
948: if (*s != 'L' && *s != 'R') {
1.109 itojun 949: logit("Invalid command.");
1.97 jakob 950: goto out;
951: }
1.121 djm 952: if (*s == 'L')
1.97 jakob 953: local = 1;
1.121 djm 954: if (local && delete) {
955: logit("Not supported.");
956: goto out;
957: }
958: if ((!local || delete) && !compat20) {
1.109 itojun 959: logit("Not supported for SSH protocol version 1.");
1.97 jakob 960: goto out;
961: }
1.121 djm 962:
963: s++;
1.97 jakob 964: while (*s && isspace(*s))
965: s++;
966:
1.121 djm 967: if (delete) {
1.135 djm 968: cancel_port = 0;
969: cancel_host = hpdelim(&s); /* may be NULL */
970: if (s != NULL) {
971: cancel_port = a2port(s);
972: cancel_host = cleanhostname(cancel_host);
973: } else {
974: cancel_port = a2port(cancel_host);
975: cancel_host = NULL;
1.121 djm 976: }
1.135 djm 977: if (cancel_port == 0) {
978: logit("Bad forwarding close port");
1.121 djm 979: goto out;
980: }
1.135 djm 981: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 982: } else {
1.135 djm 983: if (!parse_forward(&fwd, s)) {
1.121 djm 984: logit("Bad forwarding specification.");
985: goto out;
986: }
987: if (local) {
1.135 djm 988: if (channel_setup_local_fwd_listener(fwd.listen_host,
989: fwd.listen_port, fwd.connect_host,
990: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 991: logit("Port forwarding failed.");
992: goto out;
993: }
1.135 djm 994: } else {
995: channel_request_remote_forwarding(fwd.listen_host,
996: fwd.listen_port, fwd.connect_host,
997: fwd.connect_port);
998: }
999:
1.121 djm 1000: logit("Forwarding port.");
1001: }
1002:
1.97 jakob 1003: out:
1004: signal(SIGINT, handler);
1005: enter_raw_mode();
1006: if (cmd)
1007: xfree(cmd);
1008: }
1009:
1.31 markus 1010: /* process the characters one by one */
1.77 itojun 1011: static int
1.31 markus 1012: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1013: {
1.32 markus 1014: char string[1024];
1.31 markus 1015: pid_t pid;
1016: int bytes = 0;
1.42 markus 1017: u_int i;
1018: u_char ch;
1.31 markus 1019: char *s;
1020:
1.139 djm 1021: if (len <= 0)
1022: return (0);
1023:
1024: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1025: /* Get one character at a time. */
1026: ch = buf[i];
1027:
1028: if (escape_pending) {
1029: /* We have previously seen an escape character. */
1030: /* Clear the flag now. */
1031: escape_pending = 0;
1032:
1033: /* Process the escaped character. */
1034: switch (ch) {
1035: case '.':
1036: /* Terminate the connection. */
1.32 markus 1037: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1038: buffer_append(berr, string, strlen(string));
1.31 markus 1039:
1040: quit_pending = 1;
1041: return -1;
1042:
1043: case 'Z' - 64:
1044: /* Suspend the program. */
1045: /* Print a message to that effect to the user. */
1.32 markus 1046: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1047: buffer_append(berr, string, strlen(string));
1.31 markus 1048:
1049: /* Restore terminal modes and suspend. */
1050: client_suspend_self(bin, bout, berr);
1051:
1052: /* We have been continued. */
1053: continue;
1054:
1.111 markus 1055: case 'B':
1056: if (compat20) {
1057: snprintf(string, sizeof string,
1058: "%cB\r\n", escape_char);
1059: buffer_append(berr, string,
1060: strlen(string));
1061: channel_request_start(session_ident,
1062: "break", 0);
1063: packet_put_int(1000);
1064: packet_send();
1065: }
1066: continue;
1067:
1.54 markus 1068: case 'R':
1.59 markus 1069: if (compat20) {
1070: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1071: logit("Server does not support re-keying");
1.59 markus 1072: else
1073: need_rekeying = 1;
1074: }
1.54 markus 1075: continue;
1076:
1.31 markus 1077: case '&':
1078: /*
1079: * Detach the program (continue to serve connections,
1080: * but put in background and no more new connections).
1081: */
1082: /* Restore tty modes. */
1083: leave_raw_mode();
1084:
1085: /* Stop listening for new connections. */
1.86 markus 1086: channel_stop_listening();
1.31 markus 1087:
1.86 markus 1088: snprintf(string, sizeof string,
1089: "%c& [backgrounded]\n", escape_char);
1090: buffer_append(berr, string, strlen(string));
1.31 markus 1091:
1092: /* Fork into background. */
1093: pid = fork();
1094: if (pid < 0) {
1095: error("fork: %.100s", strerror(errno));
1096: continue;
1097: }
1098: if (pid != 0) { /* This is the parent. */
1099: /* The parent just exits. */
1100: exit(0);
1101: }
1102: /* The child continues serving connections. */
1.86 markus 1103: if (compat20) {
1104: buffer_append(bin, "\004", 1);
1105: /* fake EOF on stdin */
1106: return -1;
1107: } else if (!stdin_eof) {
1108: /*
1109: * Sending SSH_CMSG_EOF alone does not always appear
1110: * to be enough. So we try to send an EOF character
1111: * first.
1112: */
1113: packet_start(SSH_CMSG_STDIN_DATA);
1114: packet_put_string("\004", 1);
1115: packet_send();
1116: /* Close stdin. */
1117: stdin_eof = 1;
1118: if (buffer_len(bin) == 0) {
1119: packet_start(SSH_CMSG_EOF);
1120: packet_send();
1121: }
1122: }
1123: continue;
1.31 markus 1124:
1125: case '?':
1.32 markus 1126: snprintf(string, sizeof string,
1.31 markus 1127: "%c?\r\n\
1128: Supported escape sequences:\r\n\
1.104 stevesk 1129: %c. - terminate connection\r\n\
1.111 markus 1130: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1131: %cC - open a command line\r\n\
1132: %cR - Request rekey (SSH protocol 2 only)\r\n\
1133: %c^Z - suspend ssh\r\n\
1134: %c# - list forwarded connections\r\n\
1135: %c& - background ssh (when waiting for connections to terminate)\r\n\
1136: %c? - this message\r\n\
1137: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1138: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1139: escape_char, escape_char, escape_char, escape_char,
1140: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1141: escape_char, escape_char, escape_char);
1.32 markus 1142: buffer_append(berr, string, strlen(string));
1.31 markus 1143: continue;
1144:
1145: case '#':
1.32 markus 1146: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1147: buffer_append(berr, string, strlen(string));
1.31 markus 1148: s = channel_open_message();
1149: buffer_append(berr, s, strlen(s));
1150: xfree(s);
1.97 jakob 1151: continue;
1152:
1153: case 'C':
1.99 markus 1154: process_cmdline();
1.31 markus 1155: continue;
1156:
1157: default:
1158: if (ch != escape_char) {
1159: buffer_put_char(bin, escape_char);
1160: bytes++;
1161: }
1162: /* Escaped characters fall through here */
1163: break;
1164: }
1165: } else {
1166: /*
1167: * The previous character was not an escape char. Check if this
1168: * is an escape.
1169: */
1170: if (last_was_cr && ch == escape_char) {
1171: /* It is. Set the flag and continue to next character. */
1172: escape_pending = 1;
1173: continue;
1174: }
1175: }
1176:
1177: /*
1178: * Normal character. Record whether it was a newline,
1179: * and append it to the buffer.
1180: */
1181: last_was_cr = (ch == '\r' || ch == '\n');
1182: buffer_put_char(bin, ch);
1183: bytes++;
1184: }
1185: return bytes;
1186: }
1187:
1.77 itojun 1188: static void
1.161 deraadt 1189: client_process_input(fd_set *readset)
1.17 markus 1190: {
1.21 deraadt 1191: int len;
1.31 markus 1192: char buf[8192];
1.16 markus 1193:
1.11 markus 1194: /* Read input from stdin. */
1195: if (FD_ISSET(fileno(stdin), readset)) {
1196: /* Read as much as possible. */
1197: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1198: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1199: return; /* we'll try again later */
1.11 markus 1200: if (len <= 0) {
1.13 markus 1201: /*
1202: * Received EOF or error. They are treated
1203: * similarly, except that an error message is printed
1204: * if it was an error condition.
1205: */
1.11 markus 1206: if (len < 0) {
1207: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1208: buffer_append(&stderr_buffer, buf, strlen(buf));
1209: }
1210: /* Mark that we have seen EOF. */
1211: stdin_eof = 1;
1.13 markus 1212: /*
1213: * Send an EOF message to the server unless there is
1214: * data in the buffer. If there is data in the
1215: * buffer, no message will be sent now. Code
1216: * elsewhere will send the EOF when the buffer
1217: * becomes empty if stdin_eof is set.
1218: */
1.11 markus 1219: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1220: packet_start(SSH_CMSG_EOF);
1221: packet_send();
1.11 markus 1222: }
1.72 stevesk 1223: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1224: /*
1225: * Normal successful read, and no escape character.
1226: * Just append the data to buffer.
1227: */
1.11 markus 1228: buffer_append(&stdin_buffer, buf, len);
1229: } else {
1.13 markus 1230: /*
1231: * Normal, successful read. But we have an escape character
1232: * and have to process the characters one by one.
1233: */
1.52 markus 1234: if (process_escapes(&stdin_buffer, &stdout_buffer,
1235: &stderr_buffer, buf, len) == -1)
1.31 markus 1236: return;
1.11 markus 1237: }
1238: }
1239: }
1240:
1.77 itojun 1241: static void
1.161 deraadt 1242: client_process_output(fd_set *writeset)
1.11 markus 1243: {
1244: int len;
1245: char buf[100];
1.1 deraadt 1246:
1.11 markus 1247: /* Write buffered output to stdout. */
1248: if (FD_ISSET(fileno(stdout), writeset)) {
1249: /* Write as much data as possible. */
1250: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1251: buffer_len(&stdout_buffer));
1.11 markus 1252: if (len <= 0) {
1.64 markus 1253: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1254: len = 0;
1255: else {
1.13 markus 1256: /*
1257: * An error or EOF was encountered. Put an
1258: * error message to stderr buffer.
1259: */
1.11 markus 1260: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1261: buffer_append(&stderr_buffer, buf, strlen(buf));
1262: quit_pending = 1;
1263: return;
1264: }
1265: }
1266: /* Consume printed data from the buffer. */
1267: buffer_consume(&stdout_buffer, len);
1.57 markus 1268: stdout_bytes += len;
1.11 markus 1269: }
1270: /* Write buffered output to stderr. */
1271: if (FD_ISSET(fileno(stderr), writeset)) {
1272: /* Write as much data as possible. */
1273: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1274: buffer_len(&stderr_buffer));
1.11 markus 1275: if (len <= 0) {
1.64 markus 1276: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1277: len = 0;
1278: else {
1.13 markus 1279: /* EOF or error, but can't even print error message. */
1.11 markus 1280: quit_pending = 1;
1281: return;
1282: }
1283: }
1284: /* Consume printed characters from the buffer. */
1285: buffer_consume(&stderr_buffer, len);
1.57 markus 1286: stderr_bytes += len;
1.11 markus 1287: }
1.1 deraadt 1288: }
1289:
1.13 markus 1290: /*
1.15 markus 1291: * Get packets from the connection input buffer, and process them as long as
1292: * there are packets available.
1293: *
1294: * Any unknown packets received during the actual
1295: * session cause the session to terminate. This is
1296: * intended to make debugging easier since no
1297: * confirmations are sent. Any compatible protocol
1298: * extensions must be negotiated during the
1299: * preparatory phase.
1300: */
1301:
1.77 itojun 1302: static void
1.49 itojun 1303: client_process_buffered_input_packets(void)
1.15 markus 1304: {
1.54 markus 1305: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1306: }
1307:
1.31 markus 1308: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1309:
1.77 itojun 1310: static int
1.31 markus 1311: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1312: {
1.31 markus 1313: /* XXX we assume c->extended is writeable */
1314: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1315: }
1316:
1.77 itojun 1317: static void
1.60 markus 1318: client_channel_closed(int id, void *arg)
1319: {
1.83 markus 1320: channel_cancel_cleanup(id);
1.60 markus 1321: session_closed = 1;
1.113 markus 1322: leave_raw_mode();
1.60 markus 1323: }
1324:
1.15 markus 1325: /*
1.13 markus 1326: * Implements the interactive session with the server. This is called after
1327: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1328: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1329: * used as an escape character for terminating or suspending the session.
1.13 markus 1330: */
1.1 deraadt 1331:
1.20 markus 1332: int
1.30 markus 1333: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1334: {
1.46 markus 1335: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1336: double start_time, total_time;
1.130 avsm 1337: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1338: u_int nalloc = 0;
1.11 markus 1339: char buf[100];
1340:
1341: debug("Entering interactive session.");
1342:
1343: start_time = get_current_time();
1344:
1345: /* Initialize variables. */
1346: escape_pending = 0;
1347: last_was_cr = 1;
1348: exit_status = -1;
1349: stdin_eof = 0;
1350: buffer_high = 64 * 1024;
1351: connection_in = packet_get_connection_in();
1352: connection_out = packet_get_connection_out();
1.46 markus 1353: max_fd = MAX(connection_in, connection_out);
1.123 djm 1354: if (control_fd != -1)
1355: max_fd = MAX(max_fd, control_fd);
1.46 markus 1356:
1357: if (!compat20) {
1.63 markus 1358: /* enable nonblocking unless tty */
1359: if (!isatty(fileno(stdin)))
1360: set_nonblock(fileno(stdin));
1361: if (!isatty(fileno(stdout)))
1362: set_nonblock(fileno(stdout));
1363: if (!isatty(fileno(stderr)))
1364: set_nonblock(fileno(stderr));
1.46 markus 1365: max_fd = MAX(max_fd, fileno(stdin));
1366: max_fd = MAX(max_fd, fileno(stdout));
1367: max_fd = MAX(max_fd, fileno(stderr));
1368: }
1.11 markus 1369: stdin_bytes = 0;
1370: stdout_bytes = 0;
1371: stderr_bytes = 0;
1372: quit_pending = 0;
1373: escape_char = escape_char_arg;
1374:
1375: /* Initialize buffers. */
1376: buffer_init(&stdin_buffer);
1377: buffer_init(&stdout_buffer);
1378: buffer_init(&stderr_buffer);
1379:
1.15 markus 1380: client_init_dispatch();
1381:
1.105 markus 1382: /*
1383: * Set signal handlers, (e.g. to restore non-blocking mode)
1384: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1385: */
1.131 djm 1386: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1387: signal(SIGHUP, signal_handler);
1.105 markus 1388: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1389: signal(SIGINT, signal_handler);
1390: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1391: signal(SIGQUIT, signal_handler);
1392: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1393: signal(SIGTERM, signal_handler);
1.132 djm 1394: signal(SIGWINCH, window_change_handler);
1.11 markus 1395:
1396: if (have_pty)
1397: enter_raw_mode();
1398:
1.48 markus 1399: if (compat20) {
1400: session_ident = ssh2_chan_id;
1.72 stevesk 1401: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1402: channel_register_filter(session_ident,
1.149 reyk 1403: simple_escape_filter, NULL);
1.60 markus 1404: if (session_ident != -1)
1405: channel_register_cleanup(session_ident,
1.143 djm 1406: client_channel_closed, 0);
1.48 markus 1407: } else {
1408: /* Check if we should immediately send eof on stdin. */
1.16 markus 1409: client_check_initial_eof_on_stdin();
1.48 markus 1410: }
1.30 markus 1411:
1.11 markus 1412: /* Main loop of the client for the interactive session mode. */
1413: while (!quit_pending) {
1414:
1.13 markus 1415: /* Process buffered packets sent by the server. */
1.11 markus 1416: client_process_buffered_input_packets();
1417:
1.60 markus 1418: if (compat20 && session_closed && !channel_still_open())
1419: break;
1420:
1.56 markus 1421: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1422:
1.56 markus 1423: if (rekeying) {
1424: debug("rekeying in progress");
1425: } else {
1426: /*
1427: * Make packets of buffered stdin data, and buffer
1428: * them for sending to the server.
1429: */
1430: if (!compat20)
1431: client_make_packets_from_stdin_data();
1.11 markus 1432:
1.56 markus 1433: /*
1434: * Make packets from buffered channel data, and
1435: * enqueue them for sending to the server.
1436: */
1437: if (packet_not_very_much_data_to_write())
1438: channel_output_poll();
1.11 markus 1439:
1.56 markus 1440: /*
1441: * Check if the window size has changed, and buffer a
1442: * message about it to the server if so.
1443: */
1444: client_check_window_change();
1.11 markus 1445:
1.56 markus 1446: if (quit_pending)
1447: break;
1448: }
1.13 markus 1449: /*
1450: * Wait until we have something to do (something becomes
1451: * available on one of the descriptors).
1452: */
1.81 markus 1453: max_fd2 = max_fd;
1.56 markus 1454: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1455: &max_fd2, &nalloc, rekeying);
1.11 markus 1456:
1457: if (quit_pending)
1458: break;
1459:
1.56 markus 1460: /* Do channel operations unless rekeying in progress. */
1461: if (!rekeying) {
1462: channel_after_select(readset, writeset);
1.108 markus 1463: if (need_rekeying || packet_need_rekeying()) {
1464: debug("need rekeying");
1.56 markus 1465: xxx_kex->done = 0;
1466: kex_send_kexinit(xxx_kex);
1467: need_rekeying = 0;
1468: }
1469: }
1.11 markus 1470:
1.17 markus 1471: /* Buffer input from the connection. */
1.46 markus 1472: client_process_net_input(readset);
1.17 markus 1473:
1.123 djm 1474: /* Accept control connections. */
1475: client_process_control(readset);
1476:
1.17 markus 1477: if (quit_pending)
1478: break;
1.11 markus 1479:
1.17 markus 1480: if (!compat20) {
1481: /* Buffer data from stdin */
1.46 markus 1482: client_process_input(readset);
1.17 markus 1483: /*
1484: * Process output to stdout and stderr. Output to
1485: * the connection is processed elsewhere (above).
1486: */
1.46 markus 1487: client_process_output(writeset);
1.17 markus 1488: }
1.11 markus 1489:
1.13 markus 1490: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1491: if (FD_ISSET(connection_out, writeset))
1.11 markus 1492: packet_write_poll();
1493: }
1.46 markus 1494: if (readset)
1495: xfree(readset);
1496: if (writeset)
1497: xfree(writeset);
1.11 markus 1498:
1499: /* Terminate the session. */
1500:
1501: /* Stop watching for window change. */
1.132 djm 1502: signal(SIGWINCH, SIG_DFL);
1.11 markus 1503:
1.76 markus 1504: channel_free_all();
1.11 markus 1505:
1.75 markus 1506: if (have_pty)
1507: leave_raw_mode();
1508:
1509: /* restore blocking io */
1510: if (!isatty(fileno(stdin)))
1511: unset_nonblock(fileno(stdin));
1512: if (!isatty(fileno(stdout)))
1513: unset_nonblock(fileno(stdout));
1514: if (!isatty(fileno(stderr)))
1515: unset_nonblock(fileno(stderr));
1.116 dtucker 1516:
1517: /*
1518: * If there was no shell or command requested, there will be no remote
1519: * exit status to be returned. In that case, clear error code if the
1520: * connection was deliberately terminated at this end.
1521: */
1522: if (no_shell_flag && received_signal == SIGTERM) {
1523: received_signal = 0;
1524: exit_status = 0;
1525: }
1.75 markus 1526:
1.113 markus 1527: if (received_signal)
1.89 itojun 1528: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1529:
1.13 markus 1530: /*
1531: * In interactive mode (with pseudo tty) display a message indicating
1532: * that the connection has been closed.
1533: */
1.11 markus 1534: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1535: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1536: buffer_append(&stderr_buffer, buf, strlen(buf));
1537: }
1.70 markus 1538:
1.11 markus 1539: /* Output any buffered data for stdout. */
1.70 markus 1540: while (buffer_len(&stdout_buffer) > 0) {
1541: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1542: buffer_len(&stdout_buffer));
1.70 markus 1543: if (len <= 0) {
1.11 markus 1544: error("Write failed flushing stdout buffer.");
1.70 markus 1545: break;
1546: }
1.11 markus 1547: buffer_consume(&stdout_buffer, len);
1.57 markus 1548: stdout_bytes += len;
1.11 markus 1549: }
1550:
1551: /* Output any buffered data for stderr. */
1.70 markus 1552: while (buffer_len(&stderr_buffer) > 0) {
1553: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1554: buffer_len(&stderr_buffer));
1.70 markus 1555: if (len <= 0) {
1.11 markus 1556: error("Write failed flushing stderr buffer.");
1.70 markus 1557: break;
1558: }
1.11 markus 1559: buffer_consume(&stderr_buffer, len);
1.57 markus 1560: stderr_bytes += len;
1.11 markus 1561: }
1562:
1563: /* Clear and free any buffers. */
1564: memset(buf, 0, sizeof(buf));
1565: buffer_free(&stdin_buffer);
1566: buffer_free(&stdout_buffer);
1567: buffer_free(&stderr_buffer);
1568:
1569: /* Report bytes transferred, and transfer rates. */
1570: total_time = get_current_time() - start_time;
1571: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1572: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1573: if (total_time > 0)
1574: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1575: stdin_bytes / total_time, stdout_bytes / total_time,
1576: stderr_bytes / total_time);
1.11 markus 1577:
1578: /* Return the exit status of the program. */
1579: debug("Exit status %d", exit_status);
1580: return exit_status;
1.15 markus 1581: }
1582:
1583: /*********/
1584:
1.77 itojun 1585: static void
1.94 markus 1586: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1587: {
1.42 markus 1588: u_int data_len;
1.15 markus 1589: char *data = packet_get_string(&data_len);
1.93 markus 1590: packet_check_eom();
1.15 markus 1591: buffer_append(&stdout_buffer, data, data_len);
1592: memset(data, 0, data_len);
1593: xfree(data);
1594: }
1.77 itojun 1595: static void
1.94 markus 1596: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1597: {
1.42 markus 1598: u_int data_len;
1.15 markus 1599: char *data = packet_get_string(&data_len);
1.93 markus 1600: packet_check_eom();
1.15 markus 1601: buffer_append(&stderr_buffer, data, data_len);
1602: memset(data, 0, data_len);
1603: xfree(data);
1604: }
1.77 itojun 1605: static void
1.94 markus 1606: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1607: {
1608: exit_status = packet_get_int();
1.93 markus 1609: packet_check_eom();
1.15 markus 1610: /* Acknowledge the exit. */
1611: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1612: packet_send();
1613: /*
1614: * Must wait for packet to be sent since we are
1615: * exiting the loop.
1616: */
1617: packet_write_wait();
1618: /* Flag that we want to exit. */
1619: quit_pending = 1;
1620: }
1.115 markus 1621: static void
1622: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1623: {
1624: Channel *c = NULL;
1625: int remote_id, sock;
1626:
1627: /* Read the remote channel number from the message. */
1628: remote_id = packet_get_int();
1629: packet_check_eom();
1630:
1631: /*
1632: * Get a connection to the local authentication agent (this may again
1633: * get forwarded).
1634: */
1635: sock = ssh_get_authentication_socket();
1636:
1637: /*
1638: * If we could not connect the agent, send an error message back to
1639: * the server. This should never happen unless the agent dies,
1640: * because authentication forwarding is only enabled if we have an
1641: * agent.
1642: */
1643: if (sock >= 0) {
1644: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1645: -1, 0, 0, 0, "authentication agent connection", 1);
1646: c->remote_id = remote_id;
1647: c->force_drain = 1;
1648: }
1649: if (c == NULL) {
1650: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1651: packet_put_int(remote_id);
1652: } else {
1653: /* Send a confirmation to the remote host. */
1654: debug("Forwarding authentication connection.");
1655: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1656: packet_put_int(remote_id);
1657: packet_put_int(c->self);
1658: }
1659: packet_send();
1660: }
1.15 markus 1661:
1.77 itojun 1662: static Channel *
1.40 markus 1663: client_request_forwarded_tcpip(const char *request_type, int rchan)
1664: {
1.103 deraadt 1665: Channel *c = NULL;
1.40 markus 1666: char *listen_address, *originator_address;
1667: int listen_port, originator_port;
1.67 markus 1668: int sock;
1.40 markus 1669:
1670: /* Get rest of the packet */
1671: listen_address = packet_get_string(NULL);
1672: listen_port = packet_get_int();
1673: originator_address = packet_get_string(NULL);
1674: originator_port = packet_get_int();
1.93 markus 1675: packet_check_eom();
1.40 markus 1676:
1677: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1678: listen_address, listen_port, originator_address, originator_port);
1679:
1.80 stevesk 1680: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1681: if (sock < 0) {
1682: xfree(originator_address);
1683: xfree(listen_address);
1684: return NULL;
1685: }
1686: c = channel_new("forwarded-tcpip",
1687: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1688: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1689: originator_address, 1);
1.40 markus 1690: xfree(originator_address);
1691: xfree(listen_address);
1692: return c;
1693: }
1694:
1.103 deraadt 1695: static Channel *
1.40 markus 1696: client_request_x11(const char *request_type, int rchan)
1697: {
1698: Channel *c = NULL;
1699: char *originator;
1700: int originator_port;
1.67 markus 1701: int sock;
1.40 markus 1702:
1703: if (!options.forward_x11) {
1704: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1705: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1706: return NULL;
1707: }
1708: originator = packet_get_string(NULL);
1709: if (datafellows & SSH_BUG_X11FWD) {
1710: debug2("buggy server: x11 request w/o originator_port");
1711: originator_port = 0;
1712: } else {
1713: originator_port = packet_get_int();
1714: }
1.93 markus 1715: packet_check_eom();
1.40 markus 1716: /* XXX check permission */
1.47 markus 1717: debug("client_request_x11: request from %s %d", originator,
1718: originator_port);
1.67 markus 1719: xfree(originator);
1.40 markus 1720: sock = x11_connect_display();
1.67 markus 1721: if (sock < 0)
1722: return NULL;
1723: c = channel_new("x11",
1724: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1725: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1726: c->force_drain = 1;
1.40 markus 1727: return c;
1728: }
1729:
1.103 deraadt 1730: static Channel *
1.40 markus 1731: client_request_agent(const char *request_type, int rchan)
1732: {
1733: Channel *c = NULL;
1.67 markus 1734: int sock;
1.40 markus 1735:
1736: if (!options.forward_agent) {
1737: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1738: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1739: return NULL;
1740: }
1741: sock = ssh_get_authentication_socket();
1.67 markus 1742: if (sock < 0)
1743: return NULL;
1744: c = channel_new("authentication agent connection",
1745: SSH_CHANNEL_OPEN, sock, sock, -1,
1746: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1747: "authentication agent connection", 1);
1.82 markus 1748: c->force_drain = 1;
1.40 markus 1749: return c;
1750: }
1751:
1.22 markus 1752: /* XXXX move to generic input handler */
1.77 itojun 1753: static void
1.94 markus 1754: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1755: {
1756: Channel *c = NULL;
1757: char *ctype;
1758: int rchan;
1.102 markus 1759: u_int rmaxpack, rwindow, len;
1.22 markus 1760:
1761: ctype = packet_get_string(&len);
1762: rchan = packet_get_int();
1763: rwindow = packet_get_int();
1764: rmaxpack = packet_get_int();
1765:
1.24 markus 1766: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1767: ctype, rchan, rwindow, rmaxpack);
1768:
1.40 markus 1769: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1770: c = client_request_forwarded_tcpip(ctype, rchan);
1771: } else if (strcmp(ctype, "x11") == 0) {
1772: c = client_request_x11(ctype, rchan);
1773: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1774: c = client_request_agent(ctype, rchan);
1.22 markus 1775: }
1776: /* XXX duplicate : */
1777: if (c != NULL) {
1778: debug("confirm %s", ctype);
1779: c->remote_id = rchan;
1780: c->remote_window = rwindow;
1781: c->remote_maxpacket = rmaxpack;
1.69 markus 1782: if (c->type != SSH_CHANNEL_CONNECTING) {
1783: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1784: packet_put_int(c->remote_id);
1785: packet_put_int(c->self);
1786: packet_put_int(c->local_window);
1787: packet_put_int(c->local_maxpacket);
1788: packet_send();
1789: }
1.22 markus 1790: } else {
1791: debug("failure %s", ctype);
1792: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1793: packet_put_int(rchan);
1794: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1795: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1796: packet_put_cstring("open failed");
1.66 markus 1797: packet_put_cstring("");
1798: }
1.22 markus 1799: packet_send();
1800: }
1801: xfree(ctype);
1802: }
1.77 itojun 1803: static void
1.94 markus 1804: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1805: {
1806: Channel *c = NULL;
1.123 djm 1807: int exitval, id, reply, success = 0;
1.48 markus 1808: char *rtype;
1809:
1810: id = packet_get_int();
1811: rtype = packet_get_string(NULL);
1812: reply = packet_get_char();
1813:
1814: debug("client_input_channel_req: channel %d rtype %s reply %d",
1815: id, rtype, reply);
1816:
1.128 djm 1817: if (id == -1) {
1818: error("client_input_channel_req: request for channel -1");
1819: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1820: error("client_input_channel_req: channel %d: unknown channel", id);
1821: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1822: exitval = packet_get_int();
1823: if (id == session_ident) {
1824: success = 1;
1825: exit_status = exitval;
1826: } else if (c->ctl_fd == -1) {
1827: error("client_input_channel_req: unexpected channel %d",
1828: session_ident);
1829: } else {
1830: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1831: success = 1;
1832: }
1.93 markus 1833: packet_check_eom();
1.48 markus 1834: }
1835: if (reply) {
1836: packet_start(success ?
1837: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1838: packet_put_int(id);
1.48 markus 1839: packet_send();
1840: }
1841: xfree(rtype);
1842: }
1.95 markus 1843: static void
1844: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1845: {
1846: char *rtype;
1847: int want_reply;
1848: int success = 0;
1849:
1850: rtype = packet_get_string(NULL);
1851: want_reply = packet_get_char();
1.117 markus 1852: debug("client_input_global_request: rtype %s want_reply %d",
1853: rtype, want_reply);
1.95 markus 1854: if (want_reply) {
1855: packet_start(success ?
1856: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1857: packet_send();
1858: packet_write_wait();
1859: }
1860: xfree(rtype);
1861: }
1.22 markus 1862:
1.123 djm 1863: void
1.129 deraadt 1864: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1865: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1866: dispatch_fn *subsys_repl)
1867: {
1868: int len;
1.132 djm 1869: Channel *c = NULL;
1.123 djm 1870:
1871: debug2("%s: id %d", __func__, id);
1872:
1.132 djm 1873: if ((c = channel_lookup(id)) == NULL)
1874: fatal("client_session2_setup: channel %d: unknown channel", id);
1875:
1.123 djm 1876: if (want_tty) {
1877: struct winsize ws;
1878: struct termios tio;
1879:
1880: /* Store window size in the packet. */
1881: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1882: memset(&ws, 0, sizeof(ws));
1883:
1884: channel_request_start(id, "pty-req", 0);
1885: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 1886: packet_put_int((u_int)ws.ws_col);
1887: packet_put_int((u_int)ws.ws_row);
1888: packet_put_int((u_int)ws.ws_xpixel);
1889: packet_put_int((u_int)ws.ws_ypixel);
1.123 djm 1890: tio = get_saved_tio();
1891: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1892: packet_send();
1893: /* XXX wait for reply */
1.132 djm 1894: c->client_tty = 1;
1.123 djm 1895: }
1896:
1897: /* Transfer any environment variables from client to server */
1.126 djm 1898: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1899: int i, j, matched;
1900: char *name, *val;
1901:
1902: debug("Sending environment.");
1.126 djm 1903: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1904: /* Split */
1.126 djm 1905: name = xstrdup(env[i]);
1.123 djm 1906: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1907: xfree(name);
1.123 djm 1908: continue;
1909: }
1910: *val++ = '\0';
1911:
1912: matched = 0;
1913: for (j = 0; j < options.num_send_env; j++) {
1914: if (match_pattern(name, options.send_env[j])) {
1915: matched = 1;
1916: break;
1917: }
1918: }
1919: if (!matched) {
1920: debug3("Ignored env %s", name);
1.144 stevesk 1921: xfree(name);
1.123 djm 1922: continue;
1923: }
1924:
1925: debug("Sending env %s = %s", name, val);
1926: channel_request_start(id, "env", 0);
1927: packet_put_cstring(name);
1928: packet_put_cstring(val);
1929: packet_send();
1.144 stevesk 1930: xfree(name);
1.123 djm 1931: }
1932: }
1933:
1934: len = buffer_len(cmd);
1935: if (len > 0) {
1936: if (len > 900)
1937: len = 900;
1938: if (want_subsystem) {
1939: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1940: channel_request_start(id, "subsystem", subsys_repl != NULL);
1941: if (subsys_repl != NULL) {
1942: /* register callback for reply */
1943: /* XXX we assume that client_loop has already been called */
1944: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1945: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1946: }
1947: } else {
1948: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1949: channel_request_start(id, "exec", 0);
1950: }
1951: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1952: packet_send();
1953: } else {
1954: channel_request_start(id, "shell", 0);
1955: packet_send();
1956: }
1957: }
1958:
1.77 itojun 1959: static void
1.49 itojun 1960: client_init_dispatch_20(void)
1.16 markus 1961: {
1.55 markus 1962: dispatch_init(&dispatch_protocol_error);
1.100 markus 1963:
1.16 markus 1964: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1965: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1966: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1967: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1968: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1969: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1970: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1971: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1972: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1973: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1974:
1975: /* rekeying */
1976: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1977:
1978: /* global request reply messages */
1979: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1980: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1981: }
1.77 itojun 1982: static void
1.49 itojun 1983: client_init_dispatch_13(void)
1.15 markus 1984: {
1985: dispatch_init(NULL);
1986: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1987: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1988: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1989: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1990: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1991: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1992: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1993: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1994: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1995:
1996: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1997: &client_input_agent_open : &deny_input_open);
1.39 markus 1998: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1999: &x11_input_open : &deny_input_open);
1.15 markus 2000: }
1.77 itojun 2001: static void
1.49 itojun 2002: client_init_dispatch_15(void)
1.15 markus 2003: {
2004: client_init_dispatch_13();
2005: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2006: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2007: }
1.79 stevesk 2008: static void
1.49 itojun 2009: client_init_dispatch(void)
1.15 markus 2010: {
1.16 markus 2011: if (compat20)
2012: client_init_dispatch_20();
2013: else if (compat13)
1.15 markus 2014: client_init_dispatch_13();
2015: else
2016: client_init_dispatch_15();
1.113 markus 2017: }
2018:
2019: /* client specific fatal cleanup */
2020: void
1.114 markus 2021: cleanup_exit(int i)
1.113 markus 2022: {
2023: leave_raw_mode();
2024: leave_non_blocking();
1.123 djm 2025: if (options.control_path != NULL && control_fd != -1)
2026: unlink(options.control_path);
1.114 markus 2027: _exit(i);
1.1 deraadt 2028: }
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