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