Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.152
1.1 deraadt 1: /*
1.12 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
1.33 deraadt 5: * The main loop for the interactive session (client side).
1.20 markus 6: *
1.33 deraadt 7: * As far as I am concerned, the code I have written for this software
8: * can be used freely for any purpose. Any derived versions of this
9: * software must be clearly marked as such, and if the derived work is
10: * incompatible with the protocol description in the RFC file, it must be
11: * called by a name other than "ssh" or "Secure Shell".
12: *
13: *
14: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
19: * 1. Redistributions of source code must retain the above copyright
20: * notice, this list of conditions and the following disclaimer.
21: * 2. Redistributions in binary form must reproduce the above copyright
22: * notice, this list of conditions and the following disclaimer in the
23: * documentation and/or other materials provided with the distribution.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 35: *
36: *
1.33 deraadt 37: * SSH2 support added by Markus Friedl.
1.78 markus 38: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 39: *
1.33 deraadt 40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
50: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
51: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
52: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
53: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
54: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
55: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
56: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
57: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
58: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 59: */
1.1 deraadt 60:
61: #include "includes.h"
1.152 ! stevesk 62: RCSID("$OpenBSD: clientloop.c,v 1.151 2006/02/08 12:15:27 stevesk Exp $");
! 63:
! 64: #include <sys/ioctl.h>
1.150 stevesk 65:
1.151 stevesk 66: #include <paths.h>
1.150 stevesk 67: #include <termios.h>
1.1 deraadt 68:
1.45 markus 69: #include "ssh.h"
70: #include "ssh1.h"
71: #include "ssh2.h"
1.1 deraadt 72: #include "xmalloc.h"
73: #include "packet.h"
74: #include "buffer.h"
1.15 markus 75: #include "compat.h"
1.74 markus 76: #include "channels.h"
1.15 markus 77: #include "dispatch.h"
1.30 markus 78: #include "buffer.h"
79: #include "bufaux.h"
1.40 markus 80: #include "key.h"
1.54 markus 81: #include "kex.h"
1.45 markus 82: #include "log.h"
83: #include "readconf.h"
84: #include "clientloop.h"
1.147 djm 85: #include "sshconnect.h"
1.40 markus 86: #include "authfd.h"
1.45 markus 87: #include "atomicio.h"
1.118 deraadt 88: #include "sshpty.h"
1.63 markus 89: #include "misc.h"
1.123 djm 90: #include "monitor_fdpass.h"
91: #include "match.h"
92: #include "msg.h"
1.39 markus 93:
94: /* import options */
95: extern Options options;
96:
1.1 deraadt 97: /* Flag indicating that stdin should be redirected from /dev/null. */
98: extern int stdin_null_flag;
99:
1.116 dtucker 100: /* Flag indicating that no shell has been requested */
101: extern int no_shell_flag;
102:
1.123 djm 103: /* Control socket */
104: extern int control_fd;
105:
1.13 markus 106: /*
107: * Name of the host we are connecting to. This is the name given on the
108: * command line, or the HostName specified for the user-supplied name in a
109: * configuration file.
110: */
1.1 deraadt 111: extern char *host;
112:
1.13 markus 113: /*
114: * Flag to indicate that we have received a window change signal which has
115: * not yet been processed. This will cause a message indicating the new
116: * window size to be sent to the server a little later. This is volatile
117: * because this is updated in a signal handler.
118: */
1.88 markus 119: static volatile sig_atomic_t received_window_change_signal = 0;
120: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 121:
1.145 djm 122: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 123: static int in_non_blocking_mode = 0;
124:
125: /* Common data for the client loop code. */
1.31 markus 126: static int quit_pending; /* Set to non-zero to quit the client loop. */
127: static int escape_char; /* Escape character. */
1.11 markus 128: static int escape_pending; /* Last character was the escape character */
129: static int last_was_cr; /* Last character was a newline. */
130: static int exit_status; /* Used to store the exit status of the command. */
131: static int stdin_eof; /* EOF has been encountered on standard error. */
132: static Buffer stdin_buffer; /* Buffer for stdin data. */
133: static Buffer stdout_buffer; /* Buffer for stdout data. */
134: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 135: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
136: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 137: static int connection_in; /* Connection to server (input). */
138: static int connection_out; /* Connection to server (output). */
1.56 markus 139: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 140: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 141: static int server_alive_timeouts = 0;
1.1 deraadt 142:
1.77 itojun 143: static void client_init_dispatch(void);
1.16 markus 144: int session_ident = -1;
145:
1.123 djm 146: struct confirm_ctx {
147: int want_tty;
148: int want_subsys;
1.140 djm 149: int want_x_fwd;
150: int want_agent_fwd;
1.123 djm 151: Buffer cmd;
152: char *term;
153: struct termios tio;
1.126 djm 154: char **env;
1.123 djm 155: };
156:
1.54 markus 157: /*XXX*/
158: extern Kex *xxx_kex;
159:
1.123 djm 160: void ssh_process_session2_setup(int, int, int, Buffer *);
161:
1.1 deraadt 162: /* Restores stdin to blocking mode. */
163:
1.77 itojun 164: static void
1.49 itojun 165: leave_non_blocking(void)
1.1 deraadt 166: {
1.11 markus 167: if (in_non_blocking_mode) {
1.125 djm 168: unset_nonblock(fileno(stdin));
1.11 markus 169: in_non_blocking_mode = 0;
170: }
1.1 deraadt 171: }
172:
1.11 markus 173: /* Puts stdin terminal in non-blocking mode. */
174:
1.77 itojun 175: static void
1.49 itojun 176: enter_non_blocking(void)
1.1 deraadt 177: {
1.11 markus 178: in_non_blocking_mode = 1;
1.124 djm 179: set_nonblock(fileno(stdin));
1.1 deraadt 180: }
181:
1.13 markus 182: /*
183: * Signal handler for the window change signal (SIGWINCH). This just sets a
184: * flag indicating that the window has changed.
185: */
1.1 deraadt 186:
1.77 itojun 187: static void
1.11 markus 188: window_change_handler(int sig)
1.1 deraadt 189: {
1.11 markus 190: received_window_change_signal = 1;
191: signal(SIGWINCH, window_change_handler);
1.1 deraadt 192: }
193:
1.13 markus 194: /*
195: * Signal handler for signals that cause the program to terminate. These
196: * signals must be trapped to restore terminal modes.
197: */
1.1 deraadt 198:
1.77 itojun 199: static void
1.11 markus 200: signal_handler(int sig)
1.1 deraadt 201: {
1.75 markus 202: received_signal = sig;
203: quit_pending = 1;
1.1 deraadt 204: }
205:
1.13 markus 206: /*
207: * Returns current time in seconds from Jan 1, 1970 with the maximum
208: * available resolution.
209: */
1.1 deraadt 210:
1.77 itojun 211: static double
1.49 itojun 212: get_current_time(void)
1.1 deraadt 213: {
1.11 markus 214: struct timeval tv;
215: gettimeofday(&tv, NULL);
216: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 217: }
218:
219: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
220: void
221: client_x11_get_proto(const char *display, const char *xauth_path,
222: u_int trusted, char **_proto, char **_data)
223: {
224: char cmd[1024];
225: char line[512];
226: char xdisplay[512];
227: static char proto[512], data[512];
228: FILE *f;
229: int got_data = 0, generated = 0, do_unlink = 0, i;
230: char *xauthdir, *xauthfile;
231: struct stat st;
232:
233: xauthdir = xauthfile = NULL;
234: *_proto = proto;
235: *_data = data;
236: proto[0] = data[0] = '\0';
237:
238: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
239: debug("No xauth program.");
240: } else {
241: if (display == NULL) {
242: debug("x11_get_proto: DISPLAY not set");
243: return;
244: }
245: /*
246: * Handle FamilyLocal case where $DISPLAY does
247: * not match an authorization entry. For this we
248: * just try "xauth list unix:displaynum.screennum".
249: * XXX: "localhost" match to determine FamilyLocal
250: * is not perfect.
251: */
252: if (strncmp(display, "localhost:", 10) == 0) {
253: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
254: display + 10);
255: display = xdisplay;
256: }
257: if (trusted == 0) {
258: xauthdir = xmalloc(MAXPATHLEN);
259: xauthfile = xmalloc(MAXPATHLEN);
260: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
261: if (mkdtemp(xauthdir) != NULL) {
262: do_unlink = 1;
263: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
264: xauthdir);
265: snprintf(cmd, sizeof(cmd),
266: "%s -f %s generate %s " SSH_X11_PROTO
267: " untrusted timeout 1200 2>" _PATH_DEVNULL,
268: xauth_path, xauthfile, display);
269: debug2("x11_get_proto: %s", cmd);
270: if (system(cmd) == 0)
271: generated = 1;
272: }
273: }
274: snprintf(cmd, sizeof(cmd),
1.142 markus 275: "%s %s%s list %s 2>" _PATH_DEVNULL,
1.138 djm 276: xauth_path,
277: generated ? "-f " : "" ,
278: generated ? xauthfile : "",
279: display);
280: debug2("x11_get_proto: %s", cmd);
281: f = popen(cmd, "r");
282: if (f && fgets(line, sizeof(line), f) &&
283: sscanf(line, "%*s %511s %511s", proto, data) == 2)
284: got_data = 1;
285: if (f)
286: pclose(f);
287: }
288:
289: if (do_unlink) {
290: unlink(xauthfile);
291: rmdir(xauthdir);
292: }
293: if (xauthdir)
294: xfree(xauthdir);
295: if (xauthfile)
296: xfree(xauthfile);
297:
298: /*
299: * If we didn't get authentication data, just make up some
300: * data. The forwarding code will check the validity of the
301: * response anyway, and substitute this data. The X11
302: * server, however, will ignore this fake data and use
303: * whatever authentication mechanisms it was using otherwise
304: * for the local connection.
305: */
306: if (!got_data) {
307: u_int32_t rnd = 0;
308:
309: logit("Warning: No xauth data; "
310: "using fake authentication data for X11 forwarding.");
311: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
312: for (i = 0; i < 16; i++) {
313: if (i % 4 == 0)
314: rnd = arc4random();
315: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
316: rnd & 0xff);
317: rnd >>= 8;
318: }
319: }
1.1 deraadt 320: }
321:
1.13 markus 322: /*
323: * This is called when the interactive is entered. This checks if there is
324: * an EOF coming on stdin. We must check this explicitly, as select() does
325: * not appear to wake up when redirecting from /dev/null.
326: */
1.1 deraadt 327:
1.77 itojun 328: static void
1.49 itojun 329: client_check_initial_eof_on_stdin(void)
1.1 deraadt 330: {
1.11 markus 331: int len;
332: char buf[1];
1.1 deraadt 333:
1.13 markus 334: /*
335: * If standard input is to be "redirected from /dev/null", we simply
336: * mark that we have seen an EOF and send an EOF message to the
337: * server. Otherwise, we try to read a single character; it appears
338: * that for some files, such /dev/null, select() never wakes up for
339: * read for this descriptor, which means that we never get EOF. This
340: * way we will get the EOF if stdin comes from /dev/null or similar.
341: */
1.11 markus 342: if (stdin_null_flag) {
343: /* Fake EOF on stdin. */
344: debug("Sending eof.");
345: stdin_eof = 1;
346: packet_start(SSH_CMSG_EOF);
347: packet_send();
348: } else {
349: enter_non_blocking();
350:
351: /* Check for immediate EOF on stdin. */
352: len = read(fileno(stdin), buf, 1);
353: if (len == 0) {
1.13 markus 354: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 355: debug("Sending eof.");
356: stdin_eof = 1;
357: packet_start(SSH_CMSG_EOF);
358: packet_send();
359: } else if (len > 0) {
1.13 markus 360: /*
361: * Got data. We must store the data in the buffer,
362: * and also process it as an escape character if
363: * appropriate.
364: */
1.42 markus 365: if ((u_char) buf[0] == escape_char)
1.11 markus 366: escape_pending = 1;
1.52 markus 367: else
1.11 markus 368: buffer_append(&stdin_buffer, buf, 1);
369: }
370: leave_non_blocking();
371: }
1.1 deraadt 372: }
373:
374:
1.13 markus 375: /*
376: * Make packets from buffered stdin data, and buffer them for sending to the
377: * connection.
378: */
1.1 deraadt 379:
1.77 itojun 380: static void
1.49 itojun 381: client_make_packets_from_stdin_data(void)
1.1 deraadt 382: {
1.42 markus 383: u_int len;
1.1 deraadt 384:
1.11 markus 385: /* Send buffered stdin data to the server. */
386: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 387: packet_not_very_much_data_to_write()) {
1.11 markus 388: len = buffer_len(&stdin_buffer);
389: /* Keep the packets at reasonable size. */
390: if (len > packet_get_maxsize())
391: len = packet_get_maxsize();
392: packet_start(SSH_CMSG_STDIN_DATA);
393: packet_put_string(buffer_ptr(&stdin_buffer), len);
394: packet_send();
395: buffer_consume(&stdin_buffer, len);
1.52 markus 396: stdin_bytes += len;
1.11 markus 397: /* If we have a pending EOF, send it now. */
398: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
399: packet_start(SSH_CMSG_EOF);
400: packet_send();
401: }
1.1 deraadt 402: }
403: }
404:
1.13 markus 405: /*
406: * Checks if the client window has changed, and sends a packet about it to
407: * the server if so. The actual change is detected elsewhere (by a software
408: * interrupt on Unix); this just checks the flag and sends a message if
409: * appropriate.
410: */
1.1 deraadt 411:
1.77 itojun 412: static void
1.49 itojun 413: client_check_window_change(void)
1.1 deraadt 414: {
1.16 markus 415: struct winsize ws;
416:
417: if (! received_window_change_signal)
418: return;
419: /** XXX race */
420: received_window_change_signal = 0;
421:
1.37 markus 422: debug2("client_check_window_change: changed");
1.16 markus 423:
424: if (compat20) {
1.123 djm 425: channel_send_window_changes();
1.16 markus 426: } else {
1.123 djm 427: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
428: return;
1.16 markus 429: packet_start(SSH_CMSG_WINDOW_SIZE);
430: packet_put_int(ws.ws_row);
431: packet_put_int(ws.ws_col);
432: packet_put_int(ws.ws_xpixel);
433: packet_put_int(ws.ws_ypixel);
434: packet_send();
1.1 deraadt 435: }
436: }
437:
1.117 markus 438: static void
439: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
440: {
441: server_alive_timeouts = 0;
442: client_global_request_reply_fwd(type, seq, ctxt);
443: }
444:
445: static void
446: server_alive_check(void)
447: {
448: if (++server_alive_timeouts > options.server_alive_count_max)
449: packet_disconnect("Timeout, server not responding.");
450: packet_start(SSH2_MSG_GLOBAL_REQUEST);
451: packet_put_cstring("keepalive@openssh.com");
452: packet_put_char(1); /* boolean: want reply */
453: packet_send();
454: }
455:
1.13 markus 456: /*
457: * Waits until the client can do something (some data becomes available on
458: * one of the file descriptors).
459: */
1.77 itojun 460: static void
1.46 markus 461: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 462: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 463: {
1.117 markus 464: struct timeval tv, *tvp;
465: int ret;
466:
1.46 markus 467: /* Add any selections by the channel mechanism. */
1.81 markus 468: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 469:
1.16 markus 470: if (!compat20) {
1.17 markus 471: /* Read from the connection, unless our buffers are full. */
1.16 markus 472: if (buffer_len(&stdout_buffer) < buffer_high &&
473: buffer_len(&stderr_buffer) < buffer_high &&
474: channel_not_very_much_buffered_data())
1.46 markus 475: FD_SET(connection_in, *readsetp);
1.17 markus 476: /*
477: * Read from stdin, unless we have seen EOF or have very much
478: * buffered data to send to the server.
479: */
480: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 481: FD_SET(fileno(stdin), *readsetp);
1.17 markus 482:
483: /* Select stdout/stderr if have data in buffer. */
484: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 485: FD_SET(fileno(stdout), *writesetp);
1.17 markus 486: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 487: FD_SET(fileno(stderr), *writesetp);
1.16 markus 488: } else {
1.71 markus 489: /* channel_prepare_select could have closed the last channel */
1.84 markus 490: if (session_closed && !channel_still_open() &&
491: !packet_have_data_to_write()) {
492: /* clear mask since we did not call select() */
1.87 markus 493: memset(*readsetp, 0, *nallocp);
494: memset(*writesetp, 0, *nallocp);
1.84 markus 495: return;
1.71 markus 496: } else {
497: FD_SET(connection_in, *readsetp);
498: }
1.16 markus 499: }
1.11 markus 500:
501: /* Select server connection if have data to write to the server. */
502: if (packet_have_data_to_write())
1.46 markus 503: FD_SET(connection_out, *writesetp);
1.11 markus 504:
1.123 djm 505: if (control_fd != -1)
506: FD_SET(control_fd, *readsetp);
507:
1.13 markus 508: /*
509: * Wait for something to happen. This will suspend the process until
510: * some selected descriptor can be read, written, or has some other
1.117 markus 511: * event pending.
1.13 markus 512: */
1.11 markus 513:
1.117 markus 514: if (options.server_alive_interval == 0 || !compat20)
515: tvp = NULL;
1.129 deraadt 516: else {
1.117 markus 517: tv.tv_sec = options.server_alive_interval;
518: tv.tv_usec = 0;
519: tvp = &tv;
520: }
521: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
522: if (ret < 0) {
1.11 markus 523: char buf[100];
1.51 markus 524:
525: /*
526: * We have to clear the select masks, because we return.
527: * We have to return, because the mainloop checks for the flags
528: * set by the signal handlers.
529: */
1.87 markus 530: memset(*readsetp, 0, *nallocp);
531: memset(*writesetp, 0, *nallocp);
1.50 deraadt 532:
1.11 markus 533: if (errno == EINTR)
534: return;
535: /* Note: we might still have data in the buffers. */
536: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
537: buffer_append(&stderr_buffer, buf, strlen(buf));
538: quit_pending = 1;
1.117 markus 539: } else if (ret == 0)
540: server_alive_check();
1.11 markus 541: }
542:
1.77 itojun 543: static void
1.31 markus 544: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 545: {
1.11 markus 546: /* Flush stdout and stderr buffers. */
1.31 markus 547: if (buffer_len(bout) > 0)
1.112 deraadt 548: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 549: if (buffer_len(berr) > 0)
1.112 deraadt 550: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 551:
552: leave_raw_mode();
553:
1.13 markus 554: /*
555: * Free (and clear) the buffer to reduce the amount of data that gets
556: * written to swap.
557: */
1.31 markus 558: buffer_free(bin);
559: buffer_free(bout);
560: buffer_free(berr);
1.11 markus 561:
562: /* Send the suspend signal to the program itself. */
563: kill(getpid(), SIGTSTP);
564:
1.132 djm 565: /* Reset window sizes in case they have changed */
566: received_window_change_signal = 1;
1.11 markus 567:
568: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 569: buffer_init(bin);
570: buffer_init(bout);
571: buffer_init(berr);
1.11 markus 572:
573: enter_raw_mode();
574: }
575:
1.77 itojun 576: static void
1.17 markus 577: client_process_net_input(fd_set * readset)
1.11 markus 578: {
1.17 markus 579: int len;
580: char buf[8192];
1.11 markus 581:
1.13 markus 582: /*
583: * Read input from the server, and add any such data to the buffer of
584: * the packet subsystem.
585: */
1.11 markus 586: if (FD_ISSET(connection_in, readset)) {
587: /* Read as much as possible. */
588: len = read(connection_in, buf, sizeof(buf));
589: if (len == 0) {
590: /* Received EOF. The remote host has closed the connection. */
591: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
592: host);
1.1 deraadt 593: buffer_append(&stderr_buffer, buf, strlen(buf));
594: quit_pending = 1;
595: return;
1.11 markus 596: }
1.13 markus 597: /*
598: * There is a kernel bug on Solaris that causes select to
599: * sometimes wake up even though there is no data available.
600: */
1.53 millert 601: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 602: len = 0;
603:
604: if (len < 0) {
605: /* An error has encountered. Perhaps there is a network problem. */
606: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
607: host, strerror(errno));
608: buffer_append(&stderr_buffer, buf, strlen(buf));
609: quit_pending = 1;
610: return;
611: }
612: packet_process_incoming(buf, len);
613: }
1.17 markus 614: }
1.16 markus 615:
1.97 jakob 616: static void
1.123 djm 617: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
618: {
619: int id;
620: Channel *c;
1.129 deraadt 621:
1.123 djm 622: id = packet_get_int();
623: packet_check_eom();
624:
625: if ((c = channel_lookup(id)) == NULL) {
626: error("%s: no channel for id %d", __func__, id);
627: return;
628: }
629:
630: if (type == SSH2_MSG_CHANNEL_SUCCESS)
631: debug2("Request suceeded on channel %d", id);
632: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
633: error("Request failed on channel %d", id);
634: channel_free(c);
635: }
636: }
637:
638: static void
639: client_extra_session2_setup(int id, void *arg)
640: {
641: struct confirm_ctx *cctx = arg;
1.140 djm 642: const char *display;
1.123 djm 643: Channel *c;
1.126 djm 644: int i;
1.129 deraadt 645:
1.123 djm 646: if (cctx == NULL)
647: fatal("%s: cctx == NULL", __func__);
648: if ((c = channel_lookup(id)) == NULL)
649: fatal("%s: no channel for id %d", __func__, id);
650:
1.141 djm 651: display = getenv("DISPLAY");
1.140 djm 652: if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
653: char *proto, *data;
654: /* Get reasonable local authentication information. */
655: client_x11_get_proto(display, options.xauth_location,
656: options.forward_x11_trusted, &proto, &data);
657: /* Request forwarding with authentication spoofing. */
658: debug("Requesting X11 forwarding with authentication spoofing.");
659: x11_request_forwarding_with_spoofing(id, display, proto, data);
660: /* XXX wait for reply */
661: }
662:
663: if (cctx->want_agent_fwd && options.forward_agent) {
664: debug("Requesting authentication agent forwarding.");
665: channel_request_start(id, "auth-agent-req@openssh.com", 0);
666: packet_send();
667: }
668:
1.129 deraadt 669: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 670: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 671: client_subsystem_reply);
1.127 djm 672:
1.123 djm 673: c->confirm_ctx = NULL;
674: buffer_free(&cctx->cmd);
1.126 djm 675: xfree(cctx->term);
676: if (cctx->env != NULL) {
677: for (i = 0; cctx->env[i] != NULL; i++)
678: xfree(cctx->env[i]);
679: xfree(cctx->env);
1.129 deraadt 680: }
1.126 djm 681: xfree(cctx);
1.123 djm 682: }
683:
684: static void
685: client_process_control(fd_set * readset)
686: {
687: Buffer m;
688: Channel *c;
1.139 djm 689: int client_fd, new_fd[3], ver, allowed;
1.123 djm 690: socklen_t addrlen;
691: struct sockaddr_storage addr;
692: struct confirm_ctx *cctx;
693: char *cmd;
1.139 djm 694: u_int i, len, env_len, command, flags;
1.123 djm 695: uid_t euid;
696: gid_t egid;
697:
698: /*
699: * Accept connection on control socket
700: */
701: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
702: return;
703:
704: memset(&addr, 0, sizeof(addr));
705: addrlen = sizeof(addr);
706: if ((client_fd = accept(control_fd,
707: (struct sockaddr*)&addr, &addrlen)) == -1) {
708: error("%s accept: %s", __func__, strerror(errno));
709: return;
710: }
711:
712: if (getpeereid(client_fd, &euid, &egid) < 0) {
713: error("%s getpeereid failed: %s", __func__, strerror(errno));
714: close(client_fd);
715: return;
716: }
717: if ((euid != 0) && (getuid() != euid)) {
718: error("control mode uid mismatch: peer euid %u != uid %u",
719: (u_int) euid, (u_int) getuid());
720: close(client_fd);
721: return;
722: }
1.127 djm 723:
1.134 djm 724: unset_nonblock(client_fd);
725:
726: /* Read command */
727: buffer_init(&m);
728: if (ssh_msg_recv(client_fd, &m) == -1) {
729: error("%s: client msg_recv failed", __func__);
730: close(client_fd);
731: buffer_free(&m);
732: return;
733: }
1.140 djm 734: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.134 djm 735: error("%s: wrong client version %d", __func__, ver);
736: buffer_free(&m);
737: close(client_fd);
738: return;
739: }
740:
1.127 djm 741: allowed = 1;
1.134 djm 742: command = buffer_get_int(&m);
743: flags = buffer_get_int(&m);
1.123 djm 744:
1.134 djm 745: buffer_clear(&m);
1.123 djm 746:
1.134 djm 747: switch (command) {
748: case SSHMUX_COMMAND_OPEN:
1.137 djm 749: if (options.control_master == SSHCTL_MASTER_ASK ||
750: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 751: allowed = ask_permission("Allow shared connection "
752: "to %s? ", host);
753: /* continue below */
754: break;
755: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 756: if (options.control_master == SSHCTL_MASTER_ASK ||
757: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 758: allowed = ask_permission("Terminate shared connection "
759: "to %s? ", host);
760: if (allowed)
761: quit_pending = 1;
1.136 deraadt 762: /* FALLTHROUGH */
1.134 djm 763: case SSHMUX_COMMAND_ALIVE_CHECK:
764: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
765: buffer_clear(&m);
766: buffer_put_int(&m, allowed);
767: buffer_put_int(&m, getpid());
1.140 djm 768: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.134 djm 769: error("%s: client msg_send failed", __func__);
770: close(client_fd);
771: buffer_free(&m);
772: return;
773: }
774: buffer_free(&m);
775: close(client_fd);
776: return;
777: default:
778: error("Unsupported command %d", command);
779: buffer_free(&m);
780: close(client_fd);
781: return;
782: }
1.123 djm 783:
1.134 djm 784: /* Reply for SSHMUX_COMMAND_OPEN */
785: buffer_clear(&m);
1.127 djm 786: buffer_put_int(&m, allowed);
1.123 djm 787: buffer_put_int(&m, getpid());
1.140 djm 788: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 789: error("%s: client msg_send failed", __func__);
790: close(client_fd);
1.127 djm 791: buffer_free(&m);
1.123 djm 792: return;
793: }
794:
1.127 djm 795: if (!allowed) {
796: error("Refused control connection");
797: close(client_fd);
798: buffer_free(&m);
799: return;
800: }
801:
1.134 djm 802: buffer_clear(&m);
1.123 djm 803: if (ssh_msg_recv(client_fd, &m) == -1) {
804: error("%s: client msg_recv failed", __func__);
805: close(client_fd);
1.127 djm 806: buffer_free(&m);
1.123 djm 807: return;
808: }
1.140 djm 809: if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
1.123 djm 810: error("%s: wrong client version %d", __func__, ver);
811: buffer_free(&m);
812: close(client_fd);
813: return;
814: }
815:
816: cctx = xmalloc(sizeof(*cctx));
817: memset(cctx, 0, sizeof(*cctx));
1.134 djm 818: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
819: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.140 djm 820: cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
821: cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
1.123 djm 822: cctx->term = buffer_get_string(&m, &len);
823:
824: cmd = buffer_get_string(&m, &len);
825: buffer_init(&cctx->cmd);
826: buffer_append(&cctx->cmd, cmd, strlen(cmd));
827:
1.126 djm 828: env_len = buffer_get_int(&m);
829: env_len = MIN(env_len, 4096);
830: debug3("%s: receiving %d env vars", __func__, env_len);
831: if (env_len != 0) {
832: cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
833: for (i = 0; i < env_len; i++)
834: cctx->env[i] = buffer_get_string(&m, &len);
835: cctx->env[i] = NULL;
836: }
837:
1.123 djm 838: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
839: cctx->want_tty, cctx->want_subsys, cmd);
840:
841: /* Gather fds from client */
842: new_fd[0] = mm_receive_fd(client_fd);
843: new_fd[1] = mm_receive_fd(client_fd);
844: new_fd[2] = mm_receive_fd(client_fd);
845:
846: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
847: new_fd[0], new_fd[1], new_fd[2]);
848:
849: /* Try to pick up ttymodes from client before it goes raw */
850: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
851: error("%s: tcgetattr: %s", __func__, strerror(errno));
852:
1.134 djm 853: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 854: buffer_clear(&m);
1.140 djm 855: if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
1.123 djm 856: error("%s: client msg_send failed", __func__);
857: close(client_fd);
858: close(new_fd[0]);
859: close(new_fd[1]);
860: close(new_fd[2]);
1.127 djm 861: buffer_free(&m);
1.134 djm 862: xfree(cctx->term);
863: if (env_len != 0) {
864: for (i = 0; i < env_len; i++)
865: xfree(cctx->env[i]);
866: xfree(cctx->env);
867: }
1.123 djm 868: return;
869: }
870: buffer_free(&m);
871:
872: /* enable nonblocking unless tty */
873: if (!isatty(new_fd[0]))
874: set_nonblock(new_fd[0]);
875: if (!isatty(new_fd[1]))
876: set_nonblock(new_fd[1]);
877: if (!isatty(new_fd[2]))
878: set_nonblock(new_fd[2]);
879:
880: set_nonblock(client_fd);
881:
1.129 deraadt 882: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 883: new_fd[0], new_fd[1], new_fd[2],
884: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
885: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
886:
887: /* XXX */
888: c->ctl_fd = client_fd;
889:
890: debug3("%s: channel_new: %d", __func__, c->self);
891:
892: channel_send_open(c->self);
893: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
894: }
895:
896: static void
1.99 markus 897: process_cmdline(void)
1.97 jakob 898: {
899: void (*handler)(int);
1.135 djm 900: char *s, *cmd, *cancel_host;
1.121 djm 901: int delete = 0;
1.97 jakob 902: int local = 0;
1.135 djm 903: u_short cancel_port;
904: Forward fwd;
1.97 jakob 905:
906: leave_raw_mode();
1.101 markus 907: handler = signal(SIGINT, SIG_IGN);
1.99 markus 908: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 909: if (s == NULL)
910: goto out;
911: while (*s && isspace(*s))
912: s++;
1.121 djm 913: if (*s == '-')
914: s++; /* Skip cmdline '-', if any */
1.120 dtucker 915: if (*s == '\0')
1.97 jakob 916: goto out;
1.121 djm 917:
1.122 djm 918: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 919: logit("Commands:");
920: logit(" -Lport:host:hostport Request local forward");
921: logit(" -Rport:host:hostport Request remote forward");
922: logit(" -KRhostport Cancel remote forward");
1.146 reyk 923: if (!options.permit_local_command)
924: goto out;
925: logit(" !args Execute local command");
926: goto out;
927: }
928:
929: if (*s == '!' && options.permit_local_command) {
930: s++;
931: ssh_local_cmd(s);
1.121 djm 932: goto out;
933: }
934:
935: if (*s == 'K') {
936: delete = 1;
937: s++;
938: }
939: if (*s != 'L' && *s != 'R') {
1.109 itojun 940: logit("Invalid command.");
1.97 jakob 941: goto out;
942: }
1.121 djm 943: if (*s == 'L')
1.97 jakob 944: local = 1;
1.121 djm 945: if (local && delete) {
946: logit("Not supported.");
947: goto out;
948: }
949: if ((!local || delete) && !compat20) {
1.109 itojun 950: logit("Not supported for SSH protocol version 1.");
1.97 jakob 951: goto out;
952: }
1.121 djm 953:
954: s++;
1.97 jakob 955: while (*s && isspace(*s))
956: s++;
957:
1.121 djm 958: if (delete) {
1.135 djm 959: cancel_port = 0;
960: cancel_host = hpdelim(&s); /* may be NULL */
961: if (s != NULL) {
962: cancel_port = a2port(s);
963: cancel_host = cleanhostname(cancel_host);
964: } else {
965: cancel_port = a2port(cancel_host);
966: cancel_host = NULL;
1.121 djm 967: }
1.135 djm 968: if (cancel_port == 0) {
969: logit("Bad forwarding close port");
1.121 djm 970: goto out;
971: }
1.135 djm 972: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 973: } else {
1.135 djm 974: if (!parse_forward(&fwd, s)) {
1.121 djm 975: logit("Bad forwarding specification.");
976: goto out;
977: }
978: if (local) {
1.135 djm 979: if (channel_setup_local_fwd_listener(fwd.listen_host,
980: fwd.listen_port, fwd.connect_host,
981: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 982: logit("Port forwarding failed.");
983: goto out;
984: }
1.135 djm 985: } else {
986: channel_request_remote_forwarding(fwd.listen_host,
987: fwd.listen_port, fwd.connect_host,
988: fwd.connect_port);
989: }
990:
1.121 djm 991: logit("Forwarding port.");
992: }
993:
1.97 jakob 994: out:
995: signal(SIGINT, handler);
996: enter_raw_mode();
997: if (cmd)
998: xfree(cmd);
999: }
1000:
1.31 markus 1001: /* process the characters one by one */
1.77 itojun 1002: static int
1.31 markus 1003: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1004: {
1.32 markus 1005: char string[1024];
1.31 markus 1006: pid_t pid;
1007: int bytes = 0;
1.42 markus 1008: u_int i;
1009: u_char ch;
1.31 markus 1010: char *s;
1011:
1.139 djm 1012: if (len <= 0)
1013: return (0);
1014:
1015: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1016: /* Get one character at a time. */
1017: ch = buf[i];
1018:
1019: if (escape_pending) {
1020: /* We have previously seen an escape character. */
1021: /* Clear the flag now. */
1022: escape_pending = 0;
1023:
1024: /* Process the escaped character. */
1025: switch (ch) {
1026: case '.':
1027: /* Terminate the connection. */
1.32 markus 1028: snprintf(string, sizeof string, "%c.\r\n", escape_char);
1029: buffer_append(berr, string, strlen(string));
1.31 markus 1030:
1031: quit_pending = 1;
1032: return -1;
1033:
1034: case 'Z' - 64:
1035: /* Suspend the program. */
1036: /* Print a message to that effect to the user. */
1.32 markus 1037: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1038: buffer_append(berr, string, strlen(string));
1.31 markus 1039:
1040: /* Restore terminal modes and suspend. */
1041: client_suspend_self(bin, bout, berr);
1042:
1043: /* We have been continued. */
1044: continue;
1045:
1.111 markus 1046: case 'B':
1047: if (compat20) {
1048: snprintf(string, sizeof string,
1049: "%cB\r\n", escape_char);
1050: buffer_append(berr, string,
1051: strlen(string));
1052: channel_request_start(session_ident,
1053: "break", 0);
1054: packet_put_int(1000);
1055: packet_send();
1056: }
1057: continue;
1058:
1.54 markus 1059: case 'R':
1.59 markus 1060: if (compat20) {
1061: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1062: logit("Server does not support re-keying");
1.59 markus 1063: else
1064: need_rekeying = 1;
1065: }
1.54 markus 1066: continue;
1067:
1.31 markus 1068: case '&':
1069: /*
1070: * Detach the program (continue to serve connections,
1071: * but put in background and no more new connections).
1072: */
1073: /* Restore tty modes. */
1074: leave_raw_mode();
1075:
1076: /* Stop listening for new connections. */
1.86 markus 1077: channel_stop_listening();
1.31 markus 1078:
1.86 markus 1079: snprintf(string, sizeof string,
1080: "%c& [backgrounded]\n", escape_char);
1081: buffer_append(berr, string, strlen(string));
1.31 markus 1082:
1083: /* Fork into background. */
1084: pid = fork();
1085: if (pid < 0) {
1086: error("fork: %.100s", strerror(errno));
1087: continue;
1088: }
1089: if (pid != 0) { /* This is the parent. */
1090: /* The parent just exits. */
1091: exit(0);
1092: }
1093: /* The child continues serving connections. */
1.86 markus 1094: if (compat20) {
1095: buffer_append(bin, "\004", 1);
1096: /* fake EOF on stdin */
1097: return -1;
1098: } else if (!stdin_eof) {
1099: /*
1100: * Sending SSH_CMSG_EOF alone does not always appear
1101: * to be enough. So we try to send an EOF character
1102: * first.
1103: */
1104: packet_start(SSH_CMSG_STDIN_DATA);
1105: packet_put_string("\004", 1);
1106: packet_send();
1107: /* Close stdin. */
1108: stdin_eof = 1;
1109: if (buffer_len(bin) == 0) {
1110: packet_start(SSH_CMSG_EOF);
1111: packet_send();
1112: }
1113: }
1114: continue;
1.31 markus 1115:
1116: case '?':
1.32 markus 1117: snprintf(string, sizeof string,
1.31 markus 1118: "%c?\r\n\
1119: Supported escape sequences:\r\n\
1.104 stevesk 1120: %c. - terminate connection\r\n\
1.111 markus 1121: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1122: %cC - open a command line\r\n\
1123: %cR - Request rekey (SSH protocol 2 only)\r\n\
1124: %c^Z - suspend ssh\r\n\
1125: %c# - list forwarded connections\r\n\
1126: %c& - background ssh (when waiting for connections to terminate)\r\n\
1127: %c? - this message\r\n\
1128: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1129: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1130: escape_char, escape_char, escape_char, escape_char,
1131: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1132: escape_char, escape_char, escape_char);
1.32 markus 1133: buffer_append(berr, string, strlen(string));
1.31 markus 1134: continue;
1135:
1136: case '#':
1.32 markus 1137: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1138: buffer_append(berr, string, strlen(string));
1.31 markus 1139: s = channel_open_message();
1140: buffer_append(berr, s, strlen(s));
1141: xfree(s);
1.97 jakob 1142: continue;
1143:
1144: case 'C':
1.99 markus 1145: process_cmdline();
1.31 markus 1146: continue;
1147:
1148: default:
1149: if (ch != escape_char) {
1150: buffer_put_char(bin, escape_char);
1151: bytes++;
1152: }
1153: /* Escaped characters fall through here */
1154: break;
1155: }
1156: } else {
1157: /*
1158: * The previous character was not an escape char. Check if this
1159: * is an escape.
1160: */
1161: if (last_was_cr && ch == escape_char) {
1162: /* It is. Set the flag and continue to next character. */
1163: escape_pending = 1;
1164: continue;
1165: }
1166: }
1167:
1168: /*
1169: * Normal character. Record whether it was a newline,
1170: * and append it to the buffer.
1171: */
1172: last_was_cr = (ch == '\r' || ch == '\n');
1173: buffer_put_char(bin, ch);
1174: bytes++;
1175: }
1176: return bytes;
1177: }
1178:
1.77 itojun 1179: static void
1.17 markus 1180: client_process_input(fd_set * readset)
1181: {
1.21 deraadt 1182: int len;
1.31 markus 1183: char buf[8192];
1.16 markus 1184:
1.11 markus 1185: /* Read input from stdin. */
1186: if (FD_ISSET(fileno(stdin), readset)) {
1187: /* Read as much as possible. */
1188: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1189: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1190: return; /* we'll try again later */
1.11 markus 1191: if (len <= 0) {
1.13 markus 1192: /*
1193: * Received EOF or error. They are treated
1194: * similarly, except that an error message is printed
1195: * if it was an error condition.
1196: */
1.11 markus 1197: if (len < 0) {
1198: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1199: buffer_append(&stderr_buffer, buf, strlen(buf));
1200: }
1201: /* Mark that we have seen EOF. */
1202: stdin_eof = 1;
1.13 markus 1203: /*
1204: * Send an EOF message to the server unless there is
1205: * data in the buffer. If there is data in the
1206: * buffer, no message will be sent now. Code
1207: * elsewhere will send the EOF when the buffer
1208: * becomes empty if stdin_eof is set.
1209: */
1.11 markus 1210: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1211: packet_start(SSH_CMSG_EOF);
1212: packet_send();
1.11 markus 1213: }
1.72 stevesk 1214: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1215: /*
1216: * Normal successful read, and no escape character.
1217: * Just append the data to buffer.
1218: */
1.11 markus 1219: buffer_append(&stdin_buffer, buf, len);
1220: } else {
1.13 markus 1221: /*
1222: * Normal, successful read. But we have an escape character
1223: * and have to process the characters one by one.
1224: */
1.52 markus 1225: if (process_escapes(&stdin_buffer, &stdout_buffer,
1226: &stderr_buffer, buf, len) == -1)
1.31 markus 1227: return;
1.11 markus 1228: }
1229: }
1230: }
1231:
1.77 itojun 1232: static void
1.11 markus 1233: client_process_output(fd_set * writeset)
1234: {
1235: int len;
1236: char buf[100];
1.1 deraadt 1237:
1.11 markus 1238: /* Write buffered output to stdout. */
1239: if (FD_ISSET(fileno(stdout), writeset)) {
1240: /* Write as much data as possible. */
1241: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1242: buffer_len(&stdout_buffer));
1.11 markus 1243: if (len <= 0) {
1.64 markus 1244: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1245: len = 0;
1246: else {
1.13 markus 1247: /*
1248: * An error or EOF was encountered. Put an
1249: * error message to stderr buffer.
1250: */
1.11 markus 1251: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1252: buffer_append(&stderr_buffer, buf, strlen(buf));
1253: quit_pending = 1;
1254: return;
1255: }
1256: }
1257: /* Consume printed data from the buffer. */
1258: buffer_consume(&stdout_buffer, len);
1.57 markus 1259: stdout_bytes += len;
1.11 markus 1260: }
1261: /* Write buffered output to stderr. */
1262: if (FD_ISSET(fileno(stderr), writeset)) {
1263: /* Write as much data as possible. */
1264: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1265: buffer_len(&stderr_buffer));
1.11 markus 1266: if (len <= 0) {
1.64 markus 1267: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1268: len = 0;
1269: else {
1.13 markus 1270: /* EOF or error, but can't even print error message. */
1.11 markus 1271: quit_pending = 1;
1272: return;
1273: }
1274: }
1275: /* Consume printed characters from the buffer. */
1276: buffer_consume(&stderr_buffer, len);
1.57 markus 1277: stderr_bytes += len;
1.11 markus 1278: }
1.1 deraadt 1279: }
1280:
1.13 markus 1281: /*
1.15 markus 1282: * Get packets from the connection input buffer, and process them as long as
1283: * there are packets available.
1284: *
1285: * Any unknown packets received during the actual
1286: * session cause the session to terminate. This is
1287: * intended to make debugging easier since no
1288: * confirmations are sent. Any compatible protocol
1289: * extensions must be negotiated during the
1290: * preparatory phase.
1291: */
1292:
1.77 itojun 1293: static void
1.49 itojun 1294: client_process_buffered_input_packets(void)
1.15 markus 1295: {
1.54 markus 1296: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1297: }
1298:
1.31 markus 1299: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1300:
1.77 itojun 1301: static int
1.31 markus 1302: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1303: {
1.31 markus 1304: /* XXX we assume c->extended is writeable */
1305: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1306: }
1307:
1.77 itojun 1308: static void
1.60 markus 1309: client_channel_closed(int id, void *arg)
1310: {
1.83 markus 1311: channel_cancel_cleanup(id);
1.60 markus 1312: session_closed = 1;
1.113 markus 1313: leave_raw_mode();
1.60 markus 1314: }
1315:
1.15 markus 1316: /*
1.13 markus 1317: * Implements the interactive session with the server. This is called after
1318: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1319: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1320: * used as an escape character for terminating or suspending the session.
1.13 markus 1321: */
1.1 deraadt 1322:
1.20 markus 1323: int
1.30 markus 1324: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1325: {
1.46 markus 1326: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1327: double start_time, total_time;
1.130 avsm 1328: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1329: u_int nalloc = 0;
1.11 markus 1330: char buf[100];
1331:
1332: debug("Entering interactive session.");
1333:
1334: start_time = get_current_time();
1335:
1336: /* Initialize variables. */
1337: escape_pending = 0;
1338: last_was_cr = 1;
1339: exit_status = -1;
1340: stdin_eof = 0;
1341: buffer_high = 64 * 1024;
1342: connection_in = packet_get_connection_in();
1343: connection_out = packet_get_connection_out();
1.46 markus 1344: max_fd = MAX(connection_in, connection_out);
1.123 djm 1345: if (control_fd != -1)
1346: max_fd = MAX(max_fd, control_fd);
1.46 markus 1347:
1348: if (!compat20) {
1.63 markus 1349: /* enable nonblocking unless tty */
1350: if (!isatty(fileno(stdin)))
1351: set_nonblock(fileno(stdin));
1352: if (!isatty(fileno(stdout)))
1353: set_nonblock(fileno(stdout));
1354: if (!isatty(fileno(stderr)))
1355: set_nonblock(fileno(stderr));
1.46 markus 1356: max_fd = MAX(max_fd, fileno(stdin));
1357: max_fd = MAX(max_fd, fileno(stdout));
1358: max_fd = MAX(max_fd, fileno(stderr));
1359: }
1.11 markus 1360: stdin_bytes = 0;
1361: stdout_bytes = 0;
1362: stderr_bytes = 0;
1363: quit_pending = 0;
1364: escape_char = escape_char_arg;
1365:
1366: /* Initialize buffers. */
1367: buffer_init(&stdin_buffer);
1368: buffer_init(&stdout_buffer);
1369: buffer_init(&stderr_buffer);
1370:
1.15 markus 1371: client_init_dispatch();
1372:
1.105 markus 1373: /*
1374: * Set signal handlers, (e.g. to restore non-blocking mode)
1375: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1376: */
1.131 djm 1377: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1378: signal(SIGHUP, signal_handler);
1.105 markus 1379: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1380: signal(SIGINT, signal_handler);
1381: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1382: signal(SIGQUIT, signal_handler);
1383: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1384: signal(SIGTERM, signal_handler);
1.132 djm 1385: signal(SIGWINCH, window_change_handler);
1.11 markus 1386:
1387: if (have_pty)
1388: enter_raw_mode();
1389:
1.48 markus 1390: if (compat20) {
1391: session_ident = ssh2_chan_id;
1.72 stevesk 1392: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1393: channel_register_filter(session_ident,
1.149 reyk 1394: simple_escape_filter, NULL);
1.60 markus 1395: if (session_ident != -1)
1396: channel_register_cleanup(session_ident,
1.143 djm 1397: client_channel_closed, 0);
1.48 markus 1398: } else {
1399: /* Check if we should immediately send eof on stdin. */
1.16 markus 1400: client_check_initial_eof_on_stdin();
1.48 markus 1401: }
1.30 markus 1402:
1.11 markus 1403: /* Main loop of the client for the interactive session mode. */
1404: while (!quit_pending) {
1405:
1.13 markus 1406: /* Process buffered packets sent by the server. */
1.11 markus 1407: client_process_buffered_input_packets();
1408:
1.60 markus 1409: if (compat20 && session_closed && !channel_still_open())
1410: break;
1411:
1.56 markus 1412: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1413:
1.56 markus 1414: if (rekeying) {
1415: debug("rekeying in progress");
1416: } else {
1417: /*
1418: * Make packets of buffered stdin data, and buffer
1419: * them for sending to the server.
1420: */
1421: if (!compat20)
1422: client_make_packets_from_stdin_data();
1.11 markus 1423:
1.56 markus 1424: /*
1425: * Make packets from buffered channel data, and
1426: * enqueue them for sending to the server.
1427: */
1428: if (packet_not_very_much_data_to_write())
1429: channel_output_poll();
1.11 markus 1430:
1.56 markus 1431: /*
1432: * Check if the window size has changed, and buffer a
1433: * message about it to the server if so.
1434: */
1435: client_check_window_change();
1.11 markus 1436:
1.56 markus 1437: if (quit_pending)
1438: break;
1439: }
1.13 markus 1440: /*
1441: * Wait until we have something to do (something becomes
1442: * available on one of the descriptors).
1443: */
1.81 markus 1444: max_fd2 = max_fd;
1.56 markus 1445: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1446: &max_fd2, &nalloc, rekeying);
1.11 markus 1447:
1448: if (quit_pending)
1449: break;
1450:
1.56 markus 1451: /* Do channel operations unless rekeying in progress. */
1452: if (!rekeying) {
1453: channel_after_select(readset, writeset);
1.108 markus 1454: if (need_rekeying || packet_need_rekeying()) {
1455: debug("need rekeying");
1.56 markus 1456: xxx_kex->done = 0;
1457: kex_send_kexinit(xxx_kex);
1458: need_rekeying = 0;
1459: }
1460: }
1.11 markus 1461:
1.17 markus 1462: /* Buffer input from the connection. */
1.46 markus 1463: client_process_net_input(readset);
1.17 markus 1464:
1.123 djm 1465: /* Accept control connections. */
1466: client_process_control(readset);
1467:
1.17 markus 1468: if (quit_pending)
1469: break;
1.11 markus 1470:
1.17 markus 1471: if (!compat20) {
1472: /* Buffer data from stdin */
1.46 markus 1473: client_process_input(readset);
1.17 markus 1474: /*
1475: * Process output to stdout and stderr. Output to
1476: * the connection is processed elsewhere (above).
1477: */
1.46 markus 1478: client_process_output(writeset);
1.17 markus 1479: }
1.11 markus 1480:
1.13 markus 1481: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1482: if (FD_ISSET(connection_out, writeset))
1.11 markus 1483: packet_write_poll();
1484: }
1.46 markus 1485: if (readset)
1486: xfree(readset);
1487: if (writeset)
1488: xfree(writeset);
1.11 markus 1489:
1490: /* Terminate the session. */
1491:
1492: /* Stop watching for window change. */
1.132 djm 1493: signal(SIGWINCH, SIG_DFL);
1.11 markus 1494:
1.76 markus 1495: channel_free_all();
1.11 markus 1496:
1.75 markus 1497: if (have_pty)
1498: leave_raw_mode();
1499:
1500: /* restore blocking io */
1501: if (!isatty(fileno(stdin)))
1502: unset_nonblock(fileno(stdin));
1503: if (!isatty(fileno(stdout)))
1504: unset_nonblock(fileno(stdout));
1505: if (!isatty(fileno(stderr)))
1506: unset_nonblock(fileno(stderr));
1.116 dtucker 1507:
1508: /*
1509: * If there was no shell or command requested, there will be no remote
1510: * exit status to be returned. In that case, clear error code if the
1511: * connection was deliberately terminated at this end.
1512: */
1513: if (no_shell_flag && received_signal == SIGTERM) {
1514: received_signal = 0;
1515: exit_status = 0;
1516: }
1.75 markus 1517:
1.113 markus 1518: if (received_signal)
1.89 itojun 1519: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1520:
1.13 markus 1521: /*
1522: * In interactive mode (with pseudo tty) display a message indicating
1523: * that the connection has been closed.
1524: */
1.11 markus 1525: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1526: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1527: buffer_append(&stderr_buffer, buf, strlen(buf));
1528: }
1.70 markus 1529:
1.11 markus 1530: /* Output any buffered data for stdout. */
1.70 markus 1531: while (buffer_len(&stdout_buffer) > 0) {
1532: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1533: buffer_len(&stdout_buffer));
1.70 markus 1534: if (len <= 0) {
1.11 markus 1535: error("Write failed flushing stdout buffer.");
1.70 markus 1536: break;
1537: }
1.11 markus 1538: buffer_consume(&stdout_buffer, len);
1.57 markus 1539: stdout_bytes += len;
1.11 markus 1540: }
1541:
1542: /* Output any buffered data for stderr. */
1.70 markus 1543: while (buffer_len(&stderr_buffer) > 0) {
1544: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1545: buffer_len(&stderr_buffer));
1.70 markus 1546: if (len <= 0) {
1.11 markus 1547: error("Write failed flushing stderr buffer.");
1.70 markus 1548: break;
1549: }
1.11 markus 1550: buffer_consume(&stderr_buffer, len);
1.57 markus 1551: stderr_bytes += len;
1.11 markus 1552: }
1553:
1554: /* Clear and free any buffers. */
1555: memset(buf, 0, sizeof(buf));
1556: buffer_free(&stdin_buffer);
1557: buffer_free(&stdout_buffer);
1558: buffer_free(&stderr_buffer);
1559:
1560: /* Report bytes transferred, and transfer rates. */
1561: total_time = get_current_time() - start_time;
1562: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1563: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1564: if (total_time > 0)
1565: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1566: stdin_bytes / total_time, stdout_bytes / total_time,
1567: stderr_bytes / total_time);
1.11 markus 1568:
1569: /* Return the exit status of the program. */
1570: debug("Exit status %d", exit_status);
1571: return exit_status;
1.15 markus 1572: }
1573:
1574: /*********/
1575:
1.77 itojun 1576: static void
1.94 markus 1577: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1578: {
1.42 markus 1579: u_int data_len;
1.15 markus 1580: char *data = packet_get_string(&data_len);
1.93 markus 1581: packet_check_eom();
1.15 markus 1582: buffer_append(&stdout_buffer, data, data_len);
1583: memset(data, 0, data_len);
1584: xfree(data);
1585: }
1.77 itojun 1586: static void
1.94 markus 1587: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1588: {
1.42 markus 1589: u_int data_len;
1.15 markus 1590: char *data = packet_get_string(&data_len);
1.93 markus 1591: packet_check_eom();
1.15 markus 1592: buffer_append(&stderr_buffer, data, data_len);
1593: memset(data, 0, data_len);
1594: xfree(data);
1595: }
1.77 itojun 1596: static void
1.94 markus 1597: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1598: {
1599: exit_status = packet_get_int();
1.93 markus 1600: packet_check_eom();
1.15 markus 1601: /* Acknowledge the exit. */
1602: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1603: packet_send();
1604: /*
1605: * Must wait for packet to be sent since we are
1606: * exiting the loop.
1607: */
1608: packet_write_wait();
1609: /* Flag that we want to exit. */
1610: quit_pending = 1;
1611: }
1.115 markus 1612: static void
1613: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1614: {
1615: Channel *c = NULL;
1616: int remote_id, sock;
1617:
1618: /* Read the remote channel number from the message. */
1619: remote_id = packet_get_int();
1620: packet_check_eom();
1621:
1622: /*
1623: * Get a connection to the local authentication agent (this may again
1624: * get forwarded).
1625: */
1626: sock = ssh_get_authentication_socket();
1627:
1628: /*
1629: * If we could not connect the agent, send an error message back to
1630: * the server. This should never happen unless the agent dies,
1631: * because authentication forwarding is only enabled if we have an
1632: * agent.
1633: */
1634: if (sock >= 0) {
1635: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1636: -1, 0, 0, 0, "authentication agent connection", 1);
1637: c->remote_id = remote_id;
1638: c->force_drain = 1;
1639: }
1640: if (c == NULL) {
1641: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1642: packet_put_int(remote_id);
1643: } else {
1644: /* Send a confirmation to the remote host. */
1645: debug("Forwarding authentication connection.");
1646: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1647: packet_put_int(remote_id);
1648: packet_put_int(c->self);
1649: }
1650: packet_send();
1651: }
1.15 markus 1652:
1.77 itojun 1653: static Channel *
1.40 markus 1654: client_request_forwarded_tcpip(const char *request_type, int rchan)
1655: {
1.103 deraadt 1656: Channel *c = NULL;
1.40 markus 1657: char *listen_address, *originator_address;
1658: int listen_port, originator_port;
1.67 markus 1659: int sock;
1.40 markus 1660:
1661: /* Get rest of the packet */
1662: listen_address = packet_get_string(NULL);
1663: listen_port = packet_get_int();
1664: originator_address = packet_get_string(NULL);
1665: originator_port = packet_get_int();
1.93 markus 1666: packet_check_eom();
1.40 markus 1667:
1668: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1669: listen_address, listen_port, originator_address, originator_port);
1670:
1.80 stevesk 1671: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1672: if (sock < 0) {
1673: xfree(originator_address);
1674: xfree(listen_address);
1675: return NULL;
1676: }
1677: c = channel_new("forwarded-tcpip",
1678: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1679: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1680: originator_address, 1);
1.40 markus 1681: xfree(originator_address);
1682: xfree(listen_address);
1683: return c;
1684: }
1685:
1.103 deraadt 1686: static Channel *
1.40 markus 1687: client_request_x11(const char *request_type, int rchan)
1688: {
1689: Channel *c = NULL;
1690: char *originator;
1691: int originator_port;
1.67 markus 1692: int sock;
1.40 markus 1693:
1694: if (!options.forward_x11) {
1695: error("Warning: ssh server tried X11 forwarding.");
1.148 stevesk 1696: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1697: return NULL;
1698: }
1699: originator = packet_get_string(NULL);
1700: if (datafellows & SSH_BUG_X11FWD) {
1701: debug2("buggy server: x11 request w/o originator_port");
1702: originator_port = 0;
1703: } else {
1704: originator_port = packet_get_int();
1705: }
1.93 markus 1706: packet_check_eom();
1.40 markus 1707: /* XXX check permission */
1.47 markus 1708: debug("client_request_x11: request from %s %d", originator,
1709: originator_port);
1.67 markus 1710: xfree(originator);
1.40 markus 1711: sock = x11_connect_display();
1.67 markus 1712: if (sock < 0)
1713: return NULL;
1714: c = channel_new("x11",
1715: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1716: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1717: c->force_drain = 1;
1.40 markus 1718: return c;
1719: }
1720:
1.103 deraadt 1721: static Channel *
1.40 markus 1722: client_request_agent(const char *request_type, int rchan)
1723: {
1724: Channel *c = NULL;
1.67 markus 1725: int sock;
1.40 markus 1726:
1727: if (!options.forward_agent) {
1728: error("Warning: ssh server tried agent forwarding.");
1.148 stevesk 1729: error("Warning: this is probably a break-in attempt by a malicious server.");
1.40 markus 1730: return NULL;
1731: }
1732: sock = ssh_get_authentication_socket();
1.67 markus 1733: if (sock < 0)
1734: return NULL;
1735: c = channel_new("authentication agent connection",
1736: SSH_CHANNEL_OPEN, sock, sock, -1,
1737: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1738: "authentication agent connection", 1);
1.82 markus 1739: c->force_drain = 1;
1.40 markus 1740: return c;
1741: }
1742:
1.22 markus 1743: /* XXXX move to generic input handler */
1.77 itojun 1744: static void
1.94 markus 1745: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1746: {
1747: Channel *c = NULL;
1748: char *ctype;
1749: int rchan;
1.102 markus 1750: u_int rmaxpack, rwindow, len;
1.22 markus 1751:
1752: ctype = packet_get_string(&len);
1753: rchan = packet_get_int();
1754: rwindow = packet_get_int();
1755: rmaxpack = packet_get_int();
1756:
1.24 markus 1757: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1758: ctype, rchan, rwindow, rmaxpack);
1759:
1.40 markus 1760: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1761: c = client_request_forwarded_tcpip(ctype, rchan);
1762: } else if (strcmp(ctype, "x11") == 0) {
1763: c = client_request_x11(ctype, rchan);
1764: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1765: c = client_request_agent(ctype, rchan);
1.22 markus 1766: }
1767: /* XXX duplicate : */
1768: if (c != NULL) {
1769: debug("confirm %s", ctype);
1770: c->remote_id = rchan;
1771: c->remote_window = rwindow;
1772: c->remote_maxpacket = rmaxpack;
1.69 markus 1773: if (c->type != SSH_CHANNEL_CONNECTING) {
1774: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1775: packet_put_int(c->remote_id);
1776: packet_put_int(c->self);
1777: packet_put_int(c->local_window);
1778: packet_put_int(c->local_maxpacket);
1779: packet_send();
1780: }
1.22 markus 1781: } else {
1782: debug("failure %s", ctype);
1783: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1784: packet_put_int(rchan);
1785: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1786: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1787: packet_put_cstring("open failed");
1.66 markus 1788: packet_put_cstring("");
1789: }
1.22 markus 1790: packet_send();
1791: }
1792: xfree(ctype);
1793: }
1.77 itojun 1794: static void
1.94 markus 1795: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1796: {
1797: Channel *c = NULL;
1.123 djm 1798: int exitval, id, reply, success = 0;
1.48 markus 1799: char *rtype;
1800:
1801: id = packet_get_int();
1802: rtype = packet_get_string(NULL);
1803: reply = packet_get_char();
1804:
1805: debug("client_input_channel_req: channel %d rtype %s reply %d",
1806: id, rtype, reply);
1807:
1.128 djm 1808: if (id == -1) {
1809: error("client_input_channel_req: request for channel -1");
1810: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1811: error("client_input_channel_req: channel %d: unknown channel", id);
1812: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1813: exitval = packet_get_int();
1814: if (id == session_ident) {
1815: success = 1;
1816: exit_status = exitval;
1817: } else if (c->ctl_fd == -1) {
1818: error("client_input_channel_req: unexpected channel %d",
1819: session_ident);
1820: } else {
1821: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1822: success = 1;
1823: }
1.93 markus 1824: packet_check_eom();
1.48 markus 1825: }
1826: if (reply) {
1827: packet_start(success ?
1828: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1829: packet_put_int(id);
1.48 markus 1830: packet_send();
1831: }
1832: xfree(rtype);
1833: }
1.95 markus 1834: static void
1835: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1836: {
1837: char *rtype;
1838: int want_reply;
1839: int success = 0;
1840:
1841: rtype = packet_get_string(NULL);
1842: want_reply = packet_get_char();
1.117 markus 1843: debug("client_input_global_request: rtype %s want_reply %d",
1844: rtype, want_reply);
1.95 markus 1845: if (want_reply) {
1846: packet_start(success ?
1847: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1848: packet_send();
1849: packet_write_wait();
1850: }
1851: xfree(rtype);
1852: }
1.22 markus 1853:
1.123 djm 1854: void
1.129 deraadt 1855: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1856: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1857: dispatch_fn *subsys_repl)
1858: {
1859: int len;
1.132 djm 1860: Channel *c = NULL;
1.123 djm 1861:
1862: debug2("%s: id %d", __func__, id);
1863:
1.132 djm 1864: if ((c = channel_lookup(id)) == NULL)
1865: fatal("client_session2_setup: channel %d: unknown channel", id);
1866:
1.123 djm 1867: if (want_tty) {
1868: struct winsize ws;
1869: struct termios tio;
1870:
1871: /* Store window size in the packet. */
1872: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1873: memset(&ws, 0, sizeof(ws));
1874:
1875: channel_request_start(id, "pty-req", 0);
1876: packet_put_cstring(term != NULL ? term : "");
1877: packet_put_int(ws.ws_col);
1878: packet_put_int(ws.ws_row);
1879: packet_put_int(ws.ws_xpixel);
1880: packet_put_int(ws.ws_ypixel);
1881: tio = get_saved_tio();
1882: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1883: packet_send();
1884: /* XXX wait for reply */
1.132 djm 1885: c->client_tty = 1;
1.123 djm 1886: }
1887:
1888: /* Transfer any environment variables from client to server */
1.126 djm 1889: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1890: int i, j, matched;
1891: char *name, *val;
1892:
1893: debug("Sending environment.");
1.126 djm 1894: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1895: /* Split */
1.126 djm 1896: name = xstrdup(env[i]);
1.123 djm 1897: if ((val = strchr(name, '=')) == NULL) {
1.144 stevesk 1898: xfree(name);
1.123 djm 1899: continue;
1900: }
1901: *val++ = '\0';
1902:
1903: matched = 0;
1904: for (j = 0; j < options.num_send_env; j++) {
1905: if (match_pattern(name, options.send_env[j])) {
1906: matched = 1;
1907: break;
1908: }
1909: }
1910: if (!matched) {
1911: debug3("Ignored env %s", name);
1.144 stevesk 1912: xfree(name);
1.123 djm 1913: continue;
1914: }
1915:
1916: debug("Sending env %s = %s", name, val);
1917: channel_request_start(id, "env", 0);
1918: packet_put_cstring(name);
1919: packet_put_cstring(val);
1920: packet_send();
1.144 stevesk 1921: xfree(name);
1.123 djm 1922: }
1923: }
1924:
1925: len = buffer_len(cmd);
1926: if (len > 0) {
1927: if (len > 900)
1928: len = 900;
1929: if (want_subsystem) {
1930: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1931: channel_request_start(id, "subsystem", subsys_repl != NULL);
1932: if (subsys_repl != NULL) {
1933: /* register callback for reply */
1934: /* XXX we assume that client_loop has already been called */
1935: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1936: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1937: }
1938: } else {
1939: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1940: channel_request_start(id, "exec", 0);
1941: }
1942: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1943: packet_send();
1944: } else {
1945: channel_request_start(id, "shell", 0);
1946: packet_send();
1947: }
1948: }
1949:
1.77 itojun 1950: static void
1.49 itojun 1951: client_init_dispatch_20(void)
1.16 markus 1952: {
1.55 markus 1953: dispatch_init(&dispatch_protocol_error);
1.100 markus 1954:
1.16 markus 1955: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1956: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1957: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1958: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1959: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1960: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1961: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1962: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1963: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1964: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1965:
1966: /* rekeying */
1967: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1968:
1969: /* global request reply messages */
1970: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1971: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1972: }
1.77 itojun 1973: static void
1.49 itojun 1974: client_init_dispatch_13(void)
1.15 markus 1975: {
1976: dispatch_init(NULL);
1977: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1978: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1979: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1980: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1981: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1982: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1983: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1984: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1985: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1986:
1987: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1988: &client_input_agent_open : &deny_input_open);
1.39 markus 1989: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1990: &x11_input_open : &deny_input_open);
1.15 markus 1991: }
1.77 itojun 1992: static void
1.49 itojun 1993: client_init_dispatch_15(void)
1.15 markus 1994: {
1995: client_init_dispatch_13();
1996: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1997: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1998: }
1.79 stevesk 1999: static void
1.49 itojun 2000: client_init_dispatch(void)
1.15 markus 2001: {
1.16 markus 2002: if (compat20)
2003: client_init_dispatch_20();
2004: else if (compat13)
1.15 markus 2005: client_init_dispatch_13();
2006: else
2007: client_init_dispatch_15();
1.113 markus 2008: }
2009:
2010: /* client specific fatal cleanup */
2011: void
1.114 markus 2012: cleanup_exit(int i)
1.113 markus 2013: {
2014: leave_raw_mode();
2015: leave_non_blocking();
1.123 djm 2016: if (options.control_path != NULL && control_fd != -1)
2017: unlink(options.control_path);
1.114 markus 2018: _exit(i);
1.1 deraadt 2019: }
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