Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.139
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"
1.139 ! djm 62: RCSID("$OpenBSD: clientloop.c,v 1.138 2005/06/16 03:38:36 djm Exp $");
1.1 deraadt 63:
1.45 markus 64: #include "ssh.h"
65: #include "ssh1.h"
66: #include "ssh2.h"
1.1 deraadt 67: #include "xmalloc.h"
68: #include "packet.h"
69: #include "buffer.h"
1.15 markus 70: #include "compat.h"
1.74 markus 71: #include "channels.h"
1.15 markus 72: #include "dispatch.h"
1.30 markus 73: #include "buffer.h"
74: #include "bufaux.h"
1.40 markus 75: #include "key.h"
1.54 markus 76: #include "kex.h"
1.45 markus 77: #include "log.h"
78: #include "readconf.h"
79: #include "clientloop.h"
1.40 markus 80: #include "authfd.h"
1.45 markus 81: #include "atomicio.h"
1.118 deraadt 82: #include "sshpty.h"
1.63 markus 83: #include "misc.h"
1.123 djm 84: #include "monitor_fdpass.h"
85: #include "match.h"
86: #include "msg.h"
1.39 markus 87:
88: /* import options */
89: extern Options options;
90:
1.1 deraadt 91: /* Flag indicating that stdin should be redirected from /dev/null. */
92: extern int stdin_null_flag;
93:
1.116 dtucker 94: /* Flag indicating that no shell has been requested */
95: extern int no_shell_flag;
96:
1.123 djm 97: /* Control socket */
98: extern int control_fd;
99:
1.13 markus 100: /*
101: * Name of the host we are connecting to. This is the name given on the
102: * command line, or the HostName specified for the user-supplied name in a
103: * configuration file.
104: */
1.1 deraadt 105: extern char *host;
106:
1.13 markus 107: /*
108: * Flag to indicate that we have received a window change signal which has
109: * not yet been processed. This will cause a message indicating the new
110: * window size to be sent to the server a little later. This is volatile
111: * because this is updated in a signal handler.
112: */
1.88 markus 113: static volatile sig_atomic_t received_window_change_signal = 0;
114: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 115:
116: /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
117: static int in_non_blocking_mode = 0;
118:
119: /* Common data for the client loop code. */
1.31 markus 120: static int quit_pending; /* Set to non-zero to quit the client loop. */
121: static int escape_char; /* Escape character. */
1.11 markus 122: static int escape_pending; /* Last character was the escape character */
123: static int last_was_cr; /* Last character was a newline. */
124: static int exit_status; /* Used to store the exit status of the command. */
125: static int stdin_eof; /* EOF has been encountered on standard error. */
126: static Buffer stdin_buffer; /* Buffer for stdin data. */
127: static Buffer stdout_buffer; /* Buffer for stdout data. */
128: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 129: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
130: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 131: static int connection_in; /* Connection to server (input). */
132: static int connection_out; /* Connection to server (output). */
1.56 markus 133: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 134: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 135: static int server_alive_timeouts = 0;
1.1 deraadt 136:
1.77 itojun 137: static void client_init_dispatch(void);
1.16 markus 138: int session_ident = -1;
139:
1.123 djm 140: struct confirm_ctx {
141: int want_tty;
142: int want_subsys;
143: Buffer cmd;
144: char *term;
145: struct termios tio;
1.126 djm 146: char **env;
1.123 djm 147: };
148:
1.54 markus 149: /*XXX*/
150: extern Kex *xxx_kex;
151:
1.123 djm 152: void ssh_process_session2_setup(int, int, int, Buffer *);
153:
1.1 deraadt 154: /* Restores stdin to blocking mode. */
155:
1.77 itojun 156: static void
1.49 itojun 157: leave_non_blocking(void)
1.1 deraadt 158: {
1.11 markus 159: if (in_non_blocking_mode) {
1.125 djm 160: unset_nonblock(fileno(stdin));
1.11 markus 161: in_non_blocking_mode = 0;
162: }
1.1 deraadt 163: }
164:
1.11 markus 165: /* Puts stdin terminal in non-blocking mode. */
166:
1.77 itojun 167: static void
1.49 itojun 168: enter_non_blocking(void)
1.1 deraadt 169: {
1.11 markus 170: in_non_blocking_mode = 1;
1.124 djm 171: set_nonblock(fileno(stdin));
1.1 deraadt 172: }
173:
1.13 markus 174: /*
175: * Signal handler for the window change signal (SIGWINCH). This just sets a
176: * flag indicating that the window has changed.
177: */
1.1 deraadt 178:
1.77 itojun 179: static void
1.11 markus 180: window_change_handler(int sig)
1.1 deraadt 181: {
1.11 markus 182: received_window_change_signal = 1;
183: signal(SIGWINCH, window_change_handler);
1.1 deraadt 184: }
185:
1.13 markus 186: /*
187: * Signal handler for signals that cause the program to terminate. These
188: * signals must be trapped to restore terminal modes.
189: */
1.1 deraadt 190:
1.77 itojun 191: static void
1.11 markus 192: signal_handler(int sig)
1.1 deraadt 193: {
1.75 markus 194: received_signal = sig;
195: quit_pending = 1;
1.1 deraadt 196: }
197:
1.13 markus 198: /*
199: * Returns current time in seconds from Jan 1, 1970 with the maximum
200: * available resolution.
201: */
1.1 deraadt 202:
1.77 itojun 203: static double
1.49 itojun 204: get_current_time(void)
1.1 deraadt 205: {
1.11 markus 206: struct timeval tv;
207: gettimeofday(&tv, NULL);
208: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 209: }
210:
211: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
212: void
213: client_x11_get_proto(const char *display, const char *xauth_path,
214: u_int trusted, char **_proto, char **_data)
215: {
216: char cmd[1024];
217: char line[512];
218: char xdisplay[512];
219: static char proto[512], data[512];
220: FILE *f;
221: int got_data = 0, generated = 0, do_unlink = 0, i;
222: char *xauthdir, *xauthfile;
223: struct stat st;
224:
225: xauthdir = xauthfile = NULL;
226: *_proto = proto;
227: *_data = data;
228: proto[0] = data[0] = '\0';
229:
230: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
231: debug("No xauth program.");
232: } else {
233: if (display == NULL) {
234: debug("x11_get_proto: DISPLAY not set");
235: return;
236: }
237: /*
238: * Handle FamilyLocal case where $DISPLAY does
239: * not match an authorization entry. For this we
240: * just try "xauth list unix:displaynum.screennum".
241: * XXX: "localhost" match to determine FamilyLocal
242: * is not perfect.
243: */
244: if (strncmp(display, "localhost:", 10) == 0) {
245: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
246: display + 10);
247: display = xdisplay;
248: }
249: if (trusted == 0) {
250: xauthdir = xmalloc(MAXPATHLEN);
251: xauthfile = xmalloc(MAXPATHLEN);
252: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
253: if (mkdtemp(xauthdir) != NULL) {
254: do_unlink = 1;
255: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
256: xauthdir);
257: snprintf(cmd, sizeof(cmd),
258: "%s -f %s generate %s " SSH_X11_PROTO
259: " untrusted timeout 1200 2>" _PATH_DEVNULL,
260: xauth_path, xauthfile, display);
261: debug2("x11_get_proto: %s", cmd);
262: if (system(cmd) == 0)
263: generated = 1;
264: }
265: }
266: snprintf(cmd, sizeof(cmd),
267: "%s %s%s list %s . 2>" _PATH_DEVNULL,
268: xauth_path,
269: generated ? "-f " : "" ,
270: generated ? xauthfile : "",
271: display);
272: debug2("x11_get_proto: %s", cmd);
273: f = popen(cmd, "r");
274: if (f && fgets(line, sizeof(line), f) &&
275: sscanf(line, "%*s %511s %511s", proto, data) == 2)
276: got_data = 1;
277: if (f)
278: pclose(f);
279: }
280:
281: if (do_unlink) {
282: unlink(xauthfile);
283: rmdir(xauthdir);
284: }
285: if (xauthdir)
286: xfree(xauthdir);
287: if (xauthfile)
288: xfree(xauthfile);
289:
290: /*
291: * If we didn't get authentication data, just make up some
292: * data. The forwarding code will check the validity of the
293: * response anyway, and substitute this data. The X11
294: * server, however, will ignore this fake data and use
295: * whatever authentication mechanisms it was using otherwise
296: * for the local connection.
297: */
298: if (!got_data) {
299: u_int32_t rnd = 0;
300:
301: logit("Warning: No xauth data; "
302: "using fake authentication data for X11 forwarding.");
303: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
304: for (i = 0; i < 16; i++) {
305: if (i % 4 == 0)
306: rnd = arc4random();
307: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
308: rnd & 0xff);
309: rnd >>= 8;
310: }
311: }
1.1 deraadt 312: }
313:
1.13 markus 314: /*
315: * This is called when the interactive is entered. This checks if there is
316: * an EOF coming on stdin. We must check this explicitly, as select() does
317: * not appear to wake up when redirecting from /dev/null.
318: */
1.1 deraadt 319:
1.77 itojun 320: static void
1.49 itojun 321: client_check_initial_eof_on_stdin(void)
1.1 deraadt 322: {
1.11 markus 323: int len;
324: char buf[1];
1.1 deraadt 325:
1.13 markus 326: /*
327: * If standard input is to be "redirected from /dev/null", we simply
328: * mark that we have seen an EOF and send an EOF message to the
329: * server. Otherwise, we try to read a single character; it appears
330: * that for some files, such /dev/null, select() never wakes up for
331: * read for this descriptor, which means that we never get EOF. This
332: * way we will get the EOF if stdin comes from /dev/null or similar.
333: */
1.11 markus 334: if (stdin_null_flag) {
335: /* Fake EOF on stdin. */
336: debug("Sending eof.");
337: stdin_eof = 1;
338: packet_start(SSH_CMSG_EOF);
339: packet_send();
340: } else {
341: enter_non_blocking();
342:
343: /* Check for immediate EOF on stdin. */
344: len = read(fileno(stdin), buf, 1);
345: if (len == 0) {
1.13 markus 346: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 347: debug("Sending eof.");
348: stdin_eof = 1;
349: packet_start(SSH_CMSG_EOF);
350: packet_send();
351: } else if (len > 0) {
1.13 markus 352: /*
353: * Got data. We must store the data in the buffer,
354: * and also process it as an escape character if
355: * appropriate.
356: */
1.42 markus 357: if ((u_char) buf[0] == escape_char)
1.11 markus 358: escape_pending = 1;
1.52 markus 359: else
1.11 markus 360: buffer_append(&stdin_buffer, buf, 1);
361: }
362: leave_non_blocking();
363: }
1.1 deraadt 364: }
365:
366:
1.13 markus 367: /*
368: * Make packets from buffered stdin data, and buffer them for sending to the
369: * connection.
370: */
1.1 deraadt 371:
1.77 itojun 372: static void
1.49 itojun 373: client_make_packets_from_stdin_data(void)
1.1 deraadt 374: {
1.42 markus 375: u_int len;
1.1 deraadt 376:
1.11 markus 377: /* Send buffered stdin data to the server. */
378: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 379: packet_not_very_much_data_to_write()) {
1.11 markus 380: len = buffer_len(&stdin_buffer);
381: /* Keep the packets at reasonable size. */
382: if (len > packet_get_maxsize())
383: len = packet_get_maxsize();
384: packet_start(SSH_CMSG_STDIN_DATA);
385: packet_put_string(buffer_ptr(&stdin_buffer), len);
386: packet_send();
387: buffer_consume(&stdin_buffer, len);
1.52 markus 388: stdin_bytes += len;
1.11 markus 389: /* If we have a pending EOF, send it now. */
390: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
391: packet_start(SSH_CMSG_EOF);
392: packet_send();
393: }
1.1 deraadt 394: }
395: }
396:
1.13 markus 397: /*
398: * Checks if the client window has changed, and sends a packet about it to
399: * the server if so. The actual change is detected elsewhere (by a software
400: * interrupt on Unix); this just checks the flag and sends a message if
401: * appropriate.
402: */
1.1 deraadt 403:
1.77 itojun 404: static void
1.49 itojun 405: client_check_window_change(void)
1.1 deraadt 406: {
1.16 markus 407: struct winsize ws;
408:
409: if (! received_window_change_signal)
410: return;
411: /** XXX race */
412: received_window_change_signal = 0;
413:
1.37 markus 414: debug2("client_check_window_change: changed");
1.16 markus 415:
416: if (compat20) {
1.123 djm 417: channel_send_window_changes();
1.16 markus 418: } else {
1.123 djm 419: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
420: return;
1.16 markus 421: packet_start(SSH_CMSG_WINDOW_SIZE);
422: packet_put_int(ws.ws_row);
423: packet_put_int(ws.ws_col);
424: packet_put_int(ws.ws_xpixel);
425: packet_put_int(ws.ws_ypixel);
426: packet_send();
1.1 deraadt 427: }
428: }
429:
1.117 markus 430: static void
431: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
432: {
433: server_alive_timeouts = 0;
434: client_global_request_reply_fwd(type, seq, ctxt);
435: }
436:
437: static void
438: server_alive_check(void)
439: {
440: if (++server_alive_timeouts > options.server_alive_count_max)
441: packet_disconnect("Timeout, server not responding.");
442: packet_start(SSH2_MSG_GLOBAL_REQUEST);
443: packet_put_cstring("keepalive@openssh.com");
444: packet_put_char(1); /* boolean: want reply */
445: packet_send();
446: }
447:
1.13 markus 448: /*
449: * Waits until the client can do something (some data becomes available on
450: * one of the file descriptors).
451: */
1.77 itojun 452: static void
1.46 markus 453: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 454: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 455: {
1.117 markus 456: struct timeval tv, *tvp;
457: int ret;
458:
1.46 markus 459: /* Add any selections by the channel mechanism. */
1.81 markus 460: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 461:
1.16 markus 462: if (!compat20) {
1.17 markus 463: /* Read from the connection, unless our buffers are full. */
1.16 markus 464: if (buffer_len(&stdout_buffer) < buffer_high &&
465: buffer_len(&stderr_buffer) < buffer_high &&
466: channel_not_very_much_buffered_data())
1.46 markus 467: FD_SET(connection_in, *readsetp);
1.17 markus 468: /*
469: * Read from stdin, unless we have seen EOF or have very much
470: * buffered data to send to the server.
471: */
472: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 473: FD_SET(fileno(stdin), *readsetp);
1.17 markus 474:
475: /* Select stdout/stderr if have data in buffer. */
476: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 477: FD_SET(fileno(stdout), *writesetp);
1.17 markus 478: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 479: FD_SET(fileno(stderr), *writesetp);
1.16 markus 480: } else {
1.71 markus 481: /* channel_prepare_select could have closed the last channel */
1.84 markus 482: if (session_closed && !channel_still_open() &&
483: !packet_have_data_to_write()) {
484: /* clear mask since we did not call select() */
1.87 markus 485: memset(*readsetp, 0, *nallocp);
486: memset(*writesetp, 0, *nallocp);
1.84 markus 487: return;
1.71 markus 488: } else {
489: FD_SET(connection_in, *readsetp);
490: }
1.16 markus 491: }
1.11 markus 492:
493: /* Select server connection if have data to write to the server. */
494: if (packet_have_data_to_write())
1.46 markus 495: FD_SET(connection_out, *writesetp);
1.11 markus 496:
1.123 djm 497: if (control_fd != -1)
498: FD_SET(control_fd, *readsetp);
499:
1.13 markus 500: /*
501: * Wait for something to happen. This will suspend the process until
502: * some selected descriptor can be read, written, or has some other
1.117 markus 503: * event pending.
1.13 markus 504: */
1.11 markus 505:
1.117 markus 506: if (options.server_alive_interval == 0 || !compat20)
507: tvp = NULL;
1.129 deraadt 508: else {
1.117 markus 509: tv.tv_sec = options.server_alive_interval;
510: tv.tv_usec = 0;
511: tvp = &tv;
512: }
513: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
514: if (ret < 0) {
1.11 markus 515: char buf[100];
1.51 markus 516:
517: /*
518: * We have to clear the select masks, because we return.
519: * We have to return, because the mainloop checks for the flags
520: * set by the signal handlers.
521: */
1.87 markus 522: memset(*readsetp, 0, *nallocp);
523: memset(*writesetp, 0, *nallocp);
1.50 deraadt 524:
1.11 markus 525: if (errno == EINTR)
526: return;
527: /* Note: we might still have data in the buffers. */
528: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
529: buffer_append(&stderr_buffer, buf, strlen(buf));
530: quit_pending = 1;
1.117 markus 531: } else if (ret == 0)
532: server_alive_check();
1.11 markus 533: }
534:
1.77 itojun 535: static void
1.31 markus 536: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 537: {
1.11 markus 538: /* Flush stdout and stderr buffers. */
1.31 markus 539: if (buffer_len(bout) > 0)
1.112 deraadt 540: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 541: if (buffer_len(berr) > 0)
1.112 deraadt 542: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 543:
544: leave_raw_mode();
545:
1.13 markus 546: /*
547: * Free (and clear) the buffer to reduce the amount of data that gets
548: * written to swap.
549: */
1.31 markus 550: buffer_free(bin);
551: buffer_free(bout);
552: buffer_free(berr);
1.11 markus 553:
554: /* Send the suspend signal to the program itself. */
555: kill(getpid(), SIGTSTP);
556:
1.132 djm 557: /* Reset window sizes in case they have changed */
558: received_window_change_signal = 1;
1.11 markus 559:
560: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 561: buffer_init(bin);
562: buffer_init(bout);
563: buffer_init(berr);
1.11 markus 564:
565: enter_raw_mode();
566: }
567:
1.77 itojun 568: static void
1.17 markus 569: client_process_net_input(fd_set * readset)
1.11 markus 570: {
1.17 markus 571: int len;
572: char buf[8192];
1.11 markus 573:
1.13 markus 574: /*
575: * Read input from the server, and add any such data to the buffer of
576: * the packet subsystem.
577: */
1.11 markus 578: if (FD_ISSET(connection_in, readset)) {
579: /* Read as much as possible. */
580: len = read(connection_in, buf, sizeof(buf));
581: if (len == 0) {
582: /* Received EOF. The remote host has closed the connection. */
583: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
584: host);
1.1 deraadt 585: buffer_append(&stderr_buffer, buf, strlen(buf));
586: quit_pending = 1;
587: return;
1.11 markus 588: }
1.13 markus 589: /*
590: * There is a kernel bug on Solaris that causes select to
591: * sometimes wake up even though there is no data available.
592: */
1.53 millert 593: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 594: len = 0;
595:
596: if (len < 0) {
597: /* An error has encountered. Perhaps there is a network problem. */
598: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
599: host, strerror(errno));
600: buffer_append(&stderr_buffer, buf, strlen(buf));
601: quit_pending = 1;
602: return;
603: }
604: packet_process_incoming(buf, len);
605: }
1.17 markus 606: }
1.16 markus 607:
1.97 jakob 608: static void
1.123 djm 609: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
610: {
611: int id;
612: Channel *c;
1.129 deraadt 613:
1.123 djm 614: id = packet_get_int();
615: packet_check_eom();
616:
617: if ((c = channel_lookup(id)) == NULL) {
618: error("%s: no channel for id %d", __func__, id);
619: return;
620: }
621:
622: if (type == SSH2_MSG_CHANNEL_SUCCESS)
623: debug2("Request suceeded on channel %d", id);
624: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
625: error("Request failed on channel %d", id);
626: channel_free(c);
627: }
628: }
629:
630: static void
631: client_extra_session2_setup(int id, void *arg)
632: {
633: struct confirm_ctx *cctx = arg;
634: Channel *c;
1.126 djm 635: int i;
1.129 deraadt 636:
1.123 djm 637: if (cctx == NULL)
638: fatal("%s: cctx == NULL", __func__);
639: if ((c = channel_lookup(id)) == NULL)
640: fatal("%s: no channel for id %d", __func__, id);
641:
1.129 deraadt 642: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 643: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 644: client_subsystem_reply);
1.127 djm 645:
1.123 djm 646: c->confirm_ctx = NULL;
647: buffer_free(&cctx->cmd);
1.126 djm 648: xfree(cctx->term);
649: if (cctx->env != NULL) {
650: for (i = 0; cctx->env[i] != NULL; i++)
651: xfree(cctx->env[i]);
652: xfree(cctx->env);
1.129 deraadt 653: }
1.126 djm 654: xfree(cctx);
1.123 djm 655: }
656:
657: static void
658: client_process_control(fd_set * readset)
659: {
660: Buffer m;
661: Channel *c;
1.139 ! djm 662: int client_fd, new_fd[3], ver, allowed;
1.123 djm 663: socklen_t addrlen;
664: struct sockaddr_storage addr;
665: struct confirm_ctx *cctx;
666: char *cmd;
1.139 ! djm 667: u_int i, len, env_len, command, flags;
1.123 djm 668: uid_t euid;
669: gid_t egid;
670:
671: /*
672: * Accept connection on control socket
673: */
674: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
675: return;
676:
677: memset(&addr, 0, sizeof(addr));
678: addrlen = sizeof(addr);
679: if ((client_fd = accept(control_fd,
680: (struct sockaddr*)&addr, &addrlen)) == -1) {
681: error("%s accept: %s", __func__, strerror(errno));
682: return;
683: }
684:
685: if (getpeereid(client_fd, &euid, &egid) < 0) {
686: error("%s getpeereid failed: %s", __func__, strerror(errno));
687: close(client_fd);
688: return;
689: }
690: if ((euid != 0) && (getuid() != euid)) {
691: error("control mode uid mismatch: peer euid %u != uid %u",
692: (u_int) euid, (u_int) getuid());
693: close(client_fd);
694: return;
695: }
1.127 djm 696:
1.134 djm 697: unset_nonblock(client_fd);
698:
699: /* Read command */
700: buffer_init(&m);
701: if (ssh_msg_recv(client_fd, &m) == -1) {
702: error("%s: client msg_recv failed", __func__);
703: close(client_fd);
704: buffer_free(&m);
705: return;
706: }
707: if ((ver = buffer_get_char(&m)) != 1) {
708: error("%s: wrong client version %d", __func__, ver);
709: buffer_free(&m);
710: close(client_fd);
711: return;
712: }
713:
1.127 djm 714: allowed = 1;
1.134 djm 715: command = buffer_get_int(&m);
716: flags = buffer_get_int(&m);
1.123 djm 717:
1.134 djm 718: buffer_clear(&m);
1.123 djm 719:
1.134 djm 720: switch (command) {
721: case SSHMUX_COMMAND_OPEN:
1.137 djm 722: if (options.control_master == SSHCTL_MASTER_ASK ||
723: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 724: allowed = ask_permission("Allow shared connection "
725: "to %s? ", host);
726: /* continue below */
727: break;
728: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 729: if (options.control_master == SSHCTL_MASTER_ASK ||
730: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 731: allowed = ask_permission("Terminate shared connection "
732: "to %s? ", host);
733: if (allowed)
734: quit_pending = 1;
1.136 deraadt 735: /* FALLTHROUGH */
1.134 djm 736: case SSHMUX_COMMAND_ALIVE_CHECK:
737: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
738: buffer_clear(&m);
739: buffer_put_int(&m, allowed);
740: buffer_put_int(&m, getpid());
741: if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
742: error("%s: client msg_send failed", __func__);
743: close(client_fd);
744: buffer_free(&m);
745: return;
746: }
747: buffer_free(&m);
748: close(client_fd);
749: return;
750: default:
751: error("Unsupported command %d", command);
752: buffer_free(&m);
753: close(client_fd);
754: return;
755: }
1.123 djm 756:
1.134 djm 757: /* Reply for SSHMUX_COMMAND_OPEN */
758: buffer_clear(&m);
1.127 djm 759: buffer_put_int(&m, allowed);
1.123 djm 760: buffer_put_int(&m, getpid());
1.134 djm 761: if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
1.123 djm 762: error("%s: client msg_send failed", __func__);
763: close(client_fd);
1.127 djm 764: buffer_free(&m);
1.123 djm 765: return;
766: }
767:
1.127 djm 768: if (!allowed) {
769: error("Refused control connection");
770: close(client_fd);
771: buffer_free(&m);
772: return;
773: }
774:
1.134 djm 775: buffer_clear(&m);
1.123 djm 776: if (ssh_msg_recv(client_fd, &m) == -1) {
777: error("%s: client msg_recv failed", __func__);
778: close(client_fd);
1.127 djm 779: buffer_free(&m);
1.123 djm 780: return;
781: }
1.134 djm 782: if ((ver = buffer_get_char(&m)) != 1) {
1.123 djm 783: error("%s: wrong client version %d", __func__, ver);
784: buffer_free(&m);
785: close(client_fd);
786: return;
787: }
788:
789: cctx = xmalloc(sizeof(*cctx));
790: memset(cctx, 0, sizeof(*cctx));
1.134 djm 791: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
792: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.123 djm 793: cctx->term = buffer_get_string(&m, &len);
794:
795: cmd = buffer_get_string(&m, &len);
796: buffer_init(&cctx->cmd);
797: buffer_append(&cctx->cmd, cmd, strlen(cmd));
798:
1.126 djm 799: env_len = buffer_get_int(&m);
800: env_len = MIN(env_len, 4096);
801: debug3("%s: receiving %d env vars", __func__, env_len);
802: if (env_len != 0) {
803: cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
804: for (i = 0; i < env_len; i++)
805: cctx->env[i] = buffer_get_string(&m, &len);
806: cctx->env[i] = NULL;
807: }
808:
1.123 djm 809: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
810: cctx->want_tty, cctx->want_subsys, cmd);
811:
812: /* Gather fds from client */
813: new_fd[0] = mm_receive_fd(client_fd);
814: new_fd[1] = mm_receive_fd(client_fd);
815: new_fd[2] = mm_receive_fd(client_fd);
816:
817: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
818: new_fd[0], new_fd[1], new_fd[2]);
819:
820: /* Try to pick up ttymodes from client before it goes raw */
821: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
822: error("%s: tcgetattr: %s", __func__, strerror(errno));
823:
1.134 djm 824: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 825: buffer_clear(&m);
1.134 djm 826: if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
1.123 djm 827: error("%s: client msg_send failed", __func__);
828: close(client_fd);
829: close(new_fd[0]);
830: close(new_fd[1]);
831: close(new_fd[2]);
1.127 djm 832: buffer_free(&m);
1.134 djm 833: xfree(cctx->term);
834: if (env_len != 0) {
835: for (i = 0; i < env_len; i++)
836: xfree(cctx->env[i]);
837: xfree(cctx->env);
838: }
1.123 djm 839: return;
840: }
841: buffer_free(&m);
842:
843: /* enable nonblocking unless tty */
844: if (!isatty(new_fd[0]))
845: set_nonblock(new_fd[0]);
846: if (!isatty(new_fd[1]))
847: set_nonblock(new_fd[1]);
848: if (!isatty(new_fd[2]))
849: set_nonblock(new_fd[2]);
850:
851: set_nonblock(client_fd);
852:
1.129 deraadt 853: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 854: new_fd[0], new_fd[1], new_fd[2],
855: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
856: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
857:
858: /* XXX */
859: c->ctl_fd = client_fd;
860:
861: debug3("%s: channel_new: %d", __func__, c->self);
862:
863: channel_send_open(c->self);
864: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
865: }
866:
867: static void
1.99 markus 868: process_cmdline(void)
1.97 jakob 869: {
870: void (*handler)(int);
1.135 djm 871: char *s, *cmd, *cancel_host;
1.121 djm 872: int delete = 0;
1.97 jakob 873: int local = 0;
1.135 djm 874: u_short cancel_port;
875: Forward fwd;
1.97 jakob 876:
877: leave_raw_mode();
1.101 markus 878: handler = signal(SIGINT, SIG_IGN);
1.99 markus 879: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 880: if (s == NULL)
881: goto out;
882: while (*s && isspace(*s))
883: s++;
1.121 djm 884: if (*s == '-')
885: s++; /* Skip cmdline '-', if any */
1.120 dtucker 886: if (*s == '\0')
1.97 jakob 887: goto out;
1.121 djm 888:
1.122 djm 889: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 890: logit("Commands:");
891: logit(" -Lport:host:hostport Request local forward");
892: logit(" -Rport:host:hostport Request remote forward");
893: logit(" -KRhostport Cancel remote forward");
894: goto out;
895: }
896:
897: if (*s == 'K') {
898: delete = 1;
899: s++;
900: }
901: if (*s != 'L' && *s != 'R') {
1.109 itojun 902: logit("Invalid command.");
1.97 jakob 903: goto out;
904: }
1.121 djm 905: if (*s == 'L')
1.97 jakob 906: local = 1;
1.121 djm 907: if (local && delete) {
908: logit("Not supported.");
909: goto out;
910: }
911: if ((!local || delete) && !compat20) {
1.109 itojun 912: logit("Not supported for SSH protocol version 1.");
1.97 jakob 913: goto out;
914: }
1.121 djm 915:
916: s++;
1.97 jakob 917: while (*s && isspace(*s))
918: s++;
919:
1.121 djm 920: if (delete) {
1.135 djm 921: cancel_port = 0;
922: cancel_host = hpdelim(&s); /* may be NULL */
923: if (s != NULL) {
924: cancel_port = a2port(s);
925: cancel_host = cleanhostname(cancel_host);
926: } else {
927: cancel_port = a2port(cancel_host);
928: cancel_host = NULL;
1.121 djm 929: }
1.135 djm 930: if (cancel_port == 0) {
931: logit("Bad forwarding close port");
1.121 djm 932: goto out;
933: }
1.135 djm 934: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 935: } else {
1.135 djm 936: if (!parse_forward(&fwd, s)) {
1.121 djm 937: logit("Bad forwarding specification.");
938: goto out;
939: }
940: if (local) {
1.135 djm 941: if (channel_setup_local_fwd_listener(fwd.listen_host,
942: fwd.listen_port, fwd.connect_host,
943: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 944: logit("Port forwarding failed.");
945: goto out;
946: }
1.135 djm 947: } else {
948: channel_request_remote_forwarding(fwd.listen_host,
949: fwd.listen_port, fwd.connect_host,
950: fwd.connect_port);
951: }
952:
1.121 djm 953: logit("Forwarding port.");
954: }
955:
1.97 jakob 956: out:
957: signal(SIGINT, handler);
958: enter_raw_mode();
959: if (cmd)
960: xfree(cmd);
961: }
962:
1.31 markus 963: /* process the characters one by one */
1.77 itojun 964: static int
1.31 markus 965: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
966: {
1.32 markus 967: char string[1024];
1.31 markus 968: pid_t pid;
969: int bytes = 0;
1.42 markus 970: u_int i;
971: u_char ch;
1.31 markus 972: char *s;
973:
1.139 ! djm 974: if (len <= 0)
! 975: return (0);
! 976:
! 977: for (i = 0; i < (u_int)len; i++) {
1.31 markus 978: /* Get one character at a time. */
979: ch = buf[i];
980:
981: if (escape_pending) {
982: /* We have previously seen an escape character. */
983: /* Clear the flag now. */
984: escape_pending = 0;
985:
986: /* Process the escaped character. */
987: switch (ch) {
988: case '.':
989: /* Terminate the connection. */
1.32 markus 990: snprintf(string, sizeof string, "%c.\r\n", escape_char);
991: buffer_append(berr, string, strlen(string));
1.31 markus 992:
993: quit_pending = 1;
994: return -1;
995:
996: case 'Z' - 64:
997: /* Suspend the program. */
998: /* Print a message to that effect to the user. */
1.32 markus 999: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1000: buffer_append(berr, string, strlen(string));
1.31 markus 1001:
1002: /* Restore terminal modes and suspend. */
1003: client_suspend_self(bin, bout, berr);
1004:
1005: /* We have been continued. */
1006: continue;
1007:
1.111 markus 1008: case 'B':
1009: if (compat20) {
1010: snprintf(string, sizeof string,
1011: "%cB\r\n", escape_char);
1012: buffer_append(berr, string,
1013: strlen(string));
1014: channel_request_start(session_ident,
1015: "break", 0);
1016: packet_put_int(1000);
1017: packet_send();
1018: }
1019: continue;
1020:
1.54 markus 1021: case 'R':
1.59 markus 1022: if (compat20) {
1023: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1024: logit("Server does not support re-keying");
1.59 markus 1025: else
1026: need_rekeying = 1;
1027: }
1.54 markus 1028: continue;
1029:
1.31 markus 1030: case '&':
1031: /*
1032: * Detach the program (continue to serve connections,
1033: * but put in background and no more new connections).
1034: */
1035: /* Restore tty modes. */
1036: leave_raw_mode();
1037:
1038: /* Stop listening for new connections. */
1.86 markus 1039: channel_stop_listening();
1.31 markus 1040:
1.86 markus 1041: snprintf(string, sizeof string,
1042: "%c& [backgrounded]\n", escape_char);
1043: buffer_append(berr, string, strlen(string));
1.31 markus 1044:
1045: /* Fork into background. */
1046: pid = fork();
1047: if (pid < 0) {
1048: error("fork: %.100s", strerror(errno));
1049: continue;
1050: }
1051: if (pid != 0) { /* This is the parent. */
1052: /* The parent just exits. */
1053: exit(0);
1054: }
1055: /* The child continues serving connections. */
1.86 markus 1056: if (compat20) {
1057: buffer_append(bin, "\004", 1);
1058: /* fake EOF on stdin */
1059: return -1;
1060: } else if (!stdin_eof) {
1061: /*
1062: * Sending SSH_CMSG_EOF alone does not always appear
1063: * to be enough. So we try to send an EOF character
1064: * first.
1065: */
1066: packet_start(SSH_CMSG_STDIN_DATA);
1067: packet_put_string("\004", 1);
1068: packet_send();
1069: /* Close stdin. */
1070: stdin_eof = 1;
1071: if (buffer_len(bin) == 0) {
1072: packet_start(SSH_CMSG_EOF);
1073: packet_send();
1074: }
1075: }
1076: continue;
1.31 markus 1077:
1078: case '?':
1.32 markus 1079: snprintf(string, sizeof string,
1.31 markus 1080: "%c?\r\n\
1081: Supported escape sequences:\r\n\
1.104 stevesk 1082: %c. - terminate connection\r\n\
1.111 markus 1083: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1084: %cC - open a command line\r\n\
1085: %cR - Request rekey (SSH protocol 2 only)\r\n\
1086: %c^Z - suspend ssh\r\n\
1087: %c# - list forwarded connections\r\n\
1088: %c& - background ssh (when waiting for connections to terminate)\r\n\
1089: %c? - this message\r\n\
1090: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1091: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1092: escape_char, escape_char, escape_char, escape_char,
1093: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1094: escape_char, escape_char, escape_char);
1.32 markus 1095: buffer_append(berr, string, strlen(string));
1.31 markus 1096: continue;
1097:
1098: case '#':
1.32 markus 1099: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1100: buffer_append(berr, string, strlen(string));
1.31 markus 1101: s = channel_open_message();
1102: buffer_append(berr, s, strlen(s));
1103: xfree(s);
1.97 jakob 1104: continue;
1105:
1106: case 'C':
1.99 markus 1107: process_cmdline();
1.31 markus 1108: continue;
1109:
1110: default:
1111: if (ch != escape_char) {
1112: buffer_put_char(bin, escape_char);
1113: bytes++;
1114: }
1115: /* Escaped characters fall through here */
1116: break;
1117: }
1118: } else {
1119: /*
1120: * The previous character was not an escape char. Check if this
1121: * is an escape.
1122: */
1123: if (last_was_cr && ch == escape_char) {
1124: /* It is. Set the flag and continue to next character. */
1125: escape_pending = 1;
1126: continue;
1127: }
1128: }
1129:
1130: /*
1131: * Normal character. Record whether it was a newline,
1132: * and append it to the buffer.
1133: */
1134: last_was_cr = (ch == '\r' || ch == '\n');
1135: buffer_put_char(bin, ch);
1136: bytes++;
1137: }
1138: return bytes;
1139: }
1140:
1.77 itojun 1141: static void
1.17 markus 1142: client_process_input(fd_set * readset)
1143: {
1.21 deraadt 1144: int len;
1.31 markus 1145: char buf[8192];
1.16 markus 1146:
1.11 markus 1147: /* Read input from stdin. */
1148: if (FD_ISSET(fileno(stdin), readset)) {
1149: /* Read as much as possible. */
1150: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1151: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1152: return; /* we'll try again later */
1.11 markus 1153: if (len <= 0) {
1.13 markus 1154: /*
1155: * Received EOF or error. They are treated
1156: * similarly, except that an error message is printed
1157: * if it was an error condition.
1158: */
1.11 markus 1159: if (len < 0) {
1160: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1161: buffer_append(&stderr_buffer, buf, strlen(buf));
1162: }
1163: /* Mark that we have seen EOF. */
1164: stdin_eof = 1;
1.13 markus 1165: /*
1166: * Send an EOF message to the server unless there is
1167: * data in the buffer. If there is data in the
1168: * buffer, no message will be sent now. Code
1169: * elsewhere will send the EOF when the buffer
1170: * becomes empty if stdin_eof is set.
1171: */
1.11 markus 1172: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1173: packet_start(SSH_CMSG_EOF);
1174: packet_send();
1.11 markus 1175: }
1.72 stevesk 1176: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1177: /*
1178: * Normal successful read, and no escape character.
1179: * Just append the data to buffer.
1180: */
1.11 markus 1181: buffer_append(&stdin_buffer, buf, len);
1182: } else {
1.13 markus 1183: /*
1184: * Normal, successful read. But we have an escape character
1185: * and have to process the characters one by one.
1186: */
1.52 markus 1187: if (process_escapes(&stdin_buffer, &stdout_buffer,
1188: &stderr_buffer, buf, len) == -1)
1.31 markus 1189: return;
1.11 markus 1190: }
1191: }
1192: }
1193:
1.77 itojun 1194: static void
1.11 markus 1195: client_process_output(fd_set * writeset)
1196: {
1197: int len;
1198: char buf[100];
1.1 deraadt 1199:
1.11 markus 1200: /* Write buffered output to stdout. */
1201: if (FD_ISSET(fileno(stdout), writeset)) {
1202: /* Write as much data as possible. */
1203: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1204: buffer_len(&stdout_buffer));
1.11 markus 1205: if (len <= 0) {
1.64 markus 1206: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1207: len = 0;
1208: else {
1.13 markus 1209: /*
1210: * An error or EOF was encountered. Put an
1211: * error message to stderr buffer.
1212: */
1.11 markus 1213: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1214: buffer_append(&stderr_buffer, buf, strlen(buf));
1215: quit_pending = 1;
1216: return;
1217: }
1218: }
1219: /* Consume printed data from the buffer. */
1220: buffer_consume(&stdout_buffer, len);
1.57 markus 1221: stdout_bytes += len;
1.11 markus 1222: }
1223: /* Write buffered output to stderr. */
1224: if (FD_ISSET(fileno(stderr), writeset)) {
1225: /* Write as much data as possible. */
1226: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1227: buffer_len(&stderr_buffer));
1.11 markus 1228: if (len <= 0) {
1.64 markus 1229: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1230: len = 0;
1231: else {
1.13 markus 1232: /* EOF or error, but can't even print error message. */
1.11 markus 1233: quit_pending = 1;
1234: return;
1235: }
1236: }
1237: /* Consume printed characters from the buffer. */
1238: buffer_consume(&stderr_buffer, len);
1.57 markus 1239: stderr_bytes += len;
1.11 markus 1240: }
1.1 deraadt 1241: }
1242:
1.13 markus 1243: /*
1.15 markus 1244: * Get packets from the connection input buffer, and process them as long as
1245: * there are packets available.
1246: *
1247: * Any unknown packets received during the actual
1248: * session cause the session to terminate. This is
1249: * intended to make debugging easier since no
1250: * confirmations are sent. Any compatible protocol
1251: * extensions must be negotiated during the
1252: * preparatory phase.
1253: */
1254:
1.77 itojun 1255: static void
1.49 itojun 1256: client_process_buffered_input_packets(void)
1.15 markus 1257: {
1.54 markus 1258: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1259: }
1260:
1.31 markus 1261: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1262:
1.77 itojun 1263: static int
1.31 markus 1264: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1265: {
1.31 markus 1266: /* XXX we assume c->extended is writeable */
1267: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1268: }
1269:
1.77 itojun 1270: static void
1.60 markus 1271: client_channel_closed(int id, void *arg)
1272: {
1.83 markus 1273: channel_cancel_cleanup(id);
1.60 markus 1274: session_closed = 1;
1.113 markus 1275: leave_raw_mode();
1.60 markus 1276: }
1277:
1.15 markus 1278: /*
1.13 markus 1279: * Implements the interactive session with the server. This is called after
1280: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1281: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1282: * used as an escape character for terminating or suspending the session.
1.13 markus 1283: */
1.1 deraadt 1284:
1.20 markus 1285: int
1.30 markus 1286: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1287: {
1.46 markus 1288: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1289: double start_time, total_time;
1.130 avsm 1290: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1291: u_int nalloc = 0;
1.11 markus 1292: char buf[100];
1293:
1294: debug("Entering interactive session.");
1295:
1296: start_time = get_current_time();
1297:
1298: /* Initialize variables. */
1299: escape_pending = 0;
1300: last_was_cr = 1;
1301: exit_status = -1;
1302: stdin_eof = 0;
1303: buffer_high = 64 * 1024;
1304: connection_in = packet_get_connection_in();
1305: connection_out = packet_get_connection_out();
1.46 markus 1306: max_fd = MAX(connection_in, connection_out);
1.123 djm 1307: if (control_fd != -1)
1308: max_fd = MAX(max_fd, control_fd);
1.46 markus 1309:
1310: if (!compat20) {
1.63 markus 1311: /* enable nonblocking unless tty */
1312: if (!isatty(fileno(stdin)))
1313: set_nonblock(fileno(stdin));
1314: if (!isatty(fileno(stdout)))
1315: set_nonblock(fileno(stdout));
1316: if (!isatty(fileno(stderr)))
1317: set_nonblock(fileno(stderr));
1.46 markus 1318: max_fd = MAX(max_fd, fileno(stdin));
1319: max_fd = MAX(max_fd, fileno(stdout));
1320: max_fd = MAX(max_fd, fileno(stderr));
1321: }
1.11 markus 1322: stdin_bytes = 0;
1323: stdout_bytes = 0;
1324: stderr_bytes = 0;
1325: quit_pending = 0;
1326: escape_char = escape_char_arg;
1327:
1328: /* Initialize buffers. */
1329: buffer_init(&stdin_buffer);
1330: buffer_init(&stdout_buffer);
1331: buffer_init(&stderr_buffer);
1332:
1.15 markus 1333: client_init_dispatch();
1334:
1.105 markus 1335: /*
1336: * Set signal handlers, (e.g. to restore non-blocking mode)
1337: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1338: */
1.131 djm 1339: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1340: signal(SIGHUP, signal_handler);
1.105 markus 1341: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1342: signal(SIGINT, signal_handler);
1343: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1344: signal(SIGQUIT, signal_handler);
1345: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1346: signal(SIGTERM, signal_handler);
1.132 djm 1347: signal(SIGWINCH, window_change_handler);
1.11 markus 1348:
1349: if (have_pty)
1350: enter_raw_mode();
1351:
1.48 markus 1352: if (compat20) {
1353: session_ident = ssh2_chan_id;
1.72 stevesk 1354: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1355: channel_register_filter(session_ident,
1356: simple_escape_filter);
1.60 markus 1357: if (session_ident != -1)
1358: channel_register_cleanup(session_ident,
1359: client_channel_closed);
1.48 markus 1360: } else {
1361: /* Check if we should immediately send eof on stdin. */
1.16 markus 1362: client_check_initial_eof_on_stdin();
1.48 markus 1363: }
1.30 markus 1364:
1.11 markus 1365: /* Main loop of the client for the interactive session mode. */
1366: while (!quit_pending) {
1367:
1.13 markus 1368: /* Process buffered packets sent by the server. */
1.11 markus 1369: client_process_buffered_input_packets();
1370:
1.60 markus 1371: if (compat20 && session_closed && !channel_still_open())
1372: break;
1373:
1.56 markus 1374: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1375:
1.56 markus 1376: if (rekeying) {
1377: debug("rekeying in progress");
1378: } else {
1379: /*
1380: * Make packets of buffered stdin data, and buffer
1381: * them for sending to the server.
1382: */
1383: if (!compat20)
1384: client_make_packets_from_stdin_data();
1.11 markus 1385:
1.56 markus 1386: /*
1387: * Make packets from buffered channel data, and
1388: * enqueue them for sending to the server.
1389: */
1390: if (packet_not_very_much_data_to_write())
1391: channel_output_poll();
1.11 markus 1392:
1.56 markus 1393: /*
1394: * Check if the window size has changed, and buffer a
1395: * message about it to the server if so.
1396: */
1397: client_check_window_change();
1.11 markus 1398:
1.56 markus 1399: if (quit_pending)
1400: break;
1401: }
1.13 markus 1402: /*
1403: * Wait until we have something to do (something becomes
1404: * available on one of the descriptors).
1405: */
1.81 markus 1406: max_fd2 = max_fd;
1.56 markus 1407: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1408: &max_fd2, &nalloc, rekeying);
1.11 markus 1409:
1410: if (quit_pending)
1411: break;
1412:
1.56 markus 1413: /* Do channel operations unless rekeying in progress. */
1414: if (!rekeying) {
1415: channel_after_select(readset, writeset);
1.108 markus 1416: if (need_rekeying || packet_need_rekeying()) {
1417: debug("need rekeying");
1.56 markus 1418: xxx_kex->done = 0;
1419: kex_send_kexinit(xxx_kex);
1420: need_rekeying = 0;
1421: }
1422: }
1.11 markus 1423:
1.17 markus 1424: /* Buffer input from the connection. */
1.46 markus 1425: client_process_net_input(readset);
1.17 markus 1426:
1.123 djm 1427: /* Accept control connections. */
1428: client_process_control(readset);
1429:
1.17 markus 1430: if (quit_pending)
1431: break;
1.11 markus 1432:
1.17 markus 1433: if (!compat20) {
1434: /* Buffer data from stdin */
1.46 markus 1435: client_process_input(readset);
1.17 markus 1436: /*
1437: * Process output to stdout and stderr. Output to
1438: * the connection is processed elsewhere (above).
1439: */
1.46 markus 1440: client_process_output(writeset);
1.17 markus 1441: }
1.11 markus 1442:
1.13 markus 1443: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1444: if (FD_ISSET(connection_out, writeset))
1.11 markus 1445: packet_write_poll();
1446: }
1.46 markus 1447: if (readset)
1448: xfree(readset);
1449: if (writeset)
1450: xfree(writeset);
1.11 markus 1451:
1452: /* Terminate the session. */
1453:
1454: /* Stop watching for window change. */
1.132 djm 1455: signal(SIGWINCH, SIG_DFL);
1.11 markus 1456:
1.76 markus 1457: channel_free_all();
1.11 markus 1458:
1.75 markus 1459: if (have_pty)
1460: leave_raw_mode();
1461:
1462: /* restore blocking io */
1463: if (!isatty(fileno(stdin)))
1464: unset_nonblock(fileno(stdin));
1465: if (!isatty(fileno(stdout)))
1466: unset_nonblock(fileno(stdout));
1467: if (!isatty(fileno(stderr)))
1468: unset_nonblock(fileno(stderr));
1.116 dtucker 1469:
1470: /*
1471: * If there was no shell or command requested, there will be no remote
1472: * exit status to be returned. In that case, clear error code if the
1473: * connection was deliberately terminated at this end.
1474: */
1475: if (no_shell_flag && received_signal == SIGTERM) {
1476: received_signal = 0;
1477: exit_status = 0;
1478: }
1.75 markus 1479:
1.113 markus 1480: if (received_signal)
1.89 itojun 1481: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1482:
1.13 markus 1483: /*
1484: * In interactive mode (with pseudo tty) display a message indicating
1485: * that the connection has been closed.
1486: */
1.11 markus 1487: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1488: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1489: buffer_append(&stderr_buffer, buf, strlen(buf));
1490: }
1.70 markus 1491:
1.11 markus 1492: /* Output any buffered data for stdout. */
1.70 markus 1493: while (buffer_len(&stdout_buffer) > 0) {
1494: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1495: buffer_len(&stdout_buffer));
1.70 markus 1496: if (len <= 0) {
1.11 markus 1497: error("Write failed flushing stdout buffer.");
1.70 markus 1498: break;
1499: }
1.11 markus 1500: buffer_consume(&stdout_buffer, len);
1.57 markus 1501: stdout_bytes += len;
1.11 markus 1502: }
1503:
1504: /* Output any buffered data for stderr. */
1.70 markus 1505: while (buffer_len(&stderr_buffer) > 0) {
1506: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1507: buffer_len(&stderr_buffer));
1.70 markus 1508: if (len <= 0) {
1.11 markus 1509: error("Write failed flushing stderr buffer.");
1.70 markus 1510: break;
1511: }
1.11 markus 1512: buffer_consume(&stderr_buffer, len);
1.57 markus 1513: stderr_bytes += len;
1.11 markus 1514: }
1515:
1516: /* Clear and free any buffers. */
1517: memset(buf, 0, sizeof(buf));
1518: buffer_free(&stdin_buffer);
1519: buffer_free(&stdout_buffer);
1520: buffer_free(&stderr_buffer);
1521:
1522: /* Report bytes transferred, and transfer rates. */
1523: total_time = get_current_time() - start_time;
1524: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1525: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1526: if (total_time > 0)
1527: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1528: stdin_bytes / total_time, stdout_bytes / total_time,
1529: stderr_bytes / total_time);
1.11 markus 1530:
1531: /* Return the exit status of the program. */
1532: debug("Exit status %d", exit_status);
1533: return exit_status;
1.15 markus 1534: }
1535:
1536: /*********/
1537:
1.77 itojun 1538: static void
1.94 markus 1539: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1540: {
1.42 markus 1541: u_int data_len;
1.15 markus 1542: char *data = packet_get_string(&data_len);
1.93 markus 1543: packet_check_eom();
1.15 markus 1544: buffer_append(&stdout_buffer, data, data_len);
1545: memset(data, 0, data_len);
1546: xfree(data);
1547: }
1.77 itojun 1548: static void
1.94 markus 1549: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1550: {
1.42 markus 1551: u_int data_len;
1.15 markus 1552: char *data = packet_get_string(&data_len);
1.93 markus 1553: packet_check_eom();
1.15 markus 1554: buffer_append(&stderr_buffer, data, data_len);
1555: memset(data, 0, data_len);
1556: xfree(data);
1557: }
1.77 itojun 1558: static void
1.94 markus 1559: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1560: {
1561: exit_status = packet_get_int();
1.93 markus 1562: packet_check_eom();
1.15 markus 1563: /* Acknowledge the exit. */
1564: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1565: packet_send();
1566: /*
1567: * Must wait for packet to be sent since we are
1568: * exiting the loop.
1569: */
1570: packet_write_wait();
1571: /* Flag that we want to exit. */
1572: quit_pending = 1;
1573: }
1.115 markus 1574: static void
1575: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1576: {
1577: Channel *c = NULL;
1578: int remote_id, sock;
1579:
1580: /* Read the remote channel number from the message. */
1581: remote_id = packet_get_int();
1582: packet_check_eom();
1583:
1584: /*
1585: * Get a connection to the local authentication agent (this may again
1586: * get forwarded).
1587: */
1588: sock = ssh_get_authentication_socket();
1589:
1590: /*
1591: * If we could not connect the agent, send an error message back to
1592: * the server. This should never happen unless the agent dies,
1593: * because authentication forwarding is only enabled if we have an
1594: * agent.
1595: */
1596: if (sock >= 0) {
1597: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1598: -1, 0, 0, 0, "authentication agent connection", 1);
1599: c->remote_id = remote_id;
1600: c->force_drain = 1;
1601: }
1602: if (c == NULL) {
1603: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1604: packet_put_int(remote_id);
1605: } else {
1606: /* Send a confirmation to the remote host. */
1607: debug("Forwarding authentication connection.");
1608: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1609: packet_put_int(remote_id);
1610: packet_put_int(c->self);
1611: }
1612: packet_send();
1613: }
1.15 markus 1614:
1.77 itojun 1615: static Channel *
1.40 markus 1616: client_request_forwarded_tcpip(const char *request_type, int rchan)
1617: {
1.103 deraadt 1618: Channel *c = NULL;
1.40 markus 1619: char *listen_address, *originator_address;
1620: int listen_port, originator_port;
1.67 markus 1621: int sock;
1.40 markus 1622:
1623: /* Get rest of the packet */
1624: listen_address = packet_get_string(NULL);
1625: listen_port = packet_get_int();
1626: originator_address = packet_get_string(NULL);
1627: originator_port = packet_get_int();
1.93 markus 1628: packet_check_eom();
1.40 markus 1629:
1630: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1631: listen_address, listen_port, originator_address, originator_port);
1632:
1.80 stevesk 1633: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1634: if (sock < 0) {
1635: xfree(originator_address);
1636: xfree(listen_address);
1637: return NULL;
1638: }
1639: c = channel_new("forwarded-tcpip",
1640: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1641: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1642: originator_address, 1);
1.40 markus 1643: xfree(originator_address);
1644: xfree(listen_address);
1645: return c;
1646: }
1647:
1.103 deraadt 1648: static Channel *
1.40 markus 1649: client_request_x11(const char *request_type, int rchan)
1650: {
1651: Channel *c = NULL;
1652: char *originator;
1653: int originator_port;
1.67 markus 1654: int sock;
1.40 markus 1655:
1656: if (!options.forward_x11) {
1657: error("Warning: ssh server tried X11 forwarding.");
1658: error("Warning: this is probably a break in attempt by a malicious server.");
1659: return NULL;
1660: }
1661: originator = packet_get_string(NULL);
1662: if (datafellows & SSH_BUG_X11FWD) {
1663: debug2("buggy server: x11 request w/o originator_port");
1664: originator_port = 0;
1665: } else {
1666: originator_port = packet_get_int();
1667: }
1.93 markus 1668: packet_check_eom();
1.40 markus 1669: /* XXX check permission */
1.47 markus 1670: debug("client_request_x11: request from %s %d", originator,
1671: originator_port);
1.67 markus 1672: xfree(originator);
1.40 markus 1673: sock = x11_connect_display();
1.67 markus 1674: if (sock < 0)
1675: return NULL;
1676: c = channel_new("x11",
1677: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1678: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1679: c->force_drain = 1;
1.40 markus 1680: return c;
1681: }
1682:
1.103 deraadt 1683: static Channel *
1.40 markus 1684: client_request_agent(const char *request_type, int rchan)
1685: {
1686: Channel *c = NULL;
1.67 markus 1687: int sock;
1.40 markus 1688:
1689: if (!options.forward_agent) {
1690: error("Warning: ssh server tried agent forwarding.");
1691: error("Warning: this is probably a break in attempt by a malicious server.");
1692: return NULL;
1693: }
1694: sock = ssh_get_authentication_socket();
1.67 markus 1695: if (sock < 0)
1696: return NULL;
1697: c = channel_new("authentication agent connection",
1698: SSH_CHANNEL_OPEN, sock, sock, -1,
1699: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1700: "authentication agent connection", 1);
1.82 markus 1701: c->force_drain = 1;
1.40 markus 1702: return c;
1703: }
1704:
1.22 markus 1705: /* XXXX move to generic input handler */
1.77 itojun 1706: static void
1.94 markus 1707: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1708: {
1709: Channel *c = NULL;
1710: char *ctype;
1711: int rchan;
1.102 markus 1712: u_int rmaxpack, rwindow, len;
1.22 markus 1713:
1714: ctype = packet_get_string(&len);
1715: rchan = packet_get_int();
1716: rwindow = packet_get_int();
1717: rmaxpack = packet_get_int();
1718:
1.24 markus 1719: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1720: ctype, rchan, rwindow, rmaxpack);
1721:
1.40 markus 1722: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1723: c = client_request_forwarded_tcpip(ctype, rchan);
1724: } else if (strcmp(ctype, "x11") == 0) {
1725: c = client_request_x11(ctype, rchan);
1726: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1727: c = client_request_agent(ctype, rchan);
1.22 markus 1728: }
1729: /* XXX duplicate : */
1730: if (c != NULL) {
1731: debug("confirm %s", ctype);
1732: c->remote_id = rchan;
1733: c->remote_window = rwindow;
1734: c->remote_maxpacket = rmaxpack;
1.69 markus 1735: if (c->type != SSH_CHANNEL_CONNECTING) {
1736: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1737: packet_put_int(c->remote_id);
1738: packet_put_int(c->self);
1739: packet_put_int(c->local_window);
1740: packet_put_int(c->local_maxpacket);
1741: packet_send();
1742: }
1.22 markus 1743: } else {
1744: debug("failure %s", ctype);
1745: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1746: packet_put_int(rchan);
1747: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1748: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1749: packet_put_cstring("open failed");
1.66 markus 1750: packet_put_cstring("");
1751: }
1.22 markus 1752: packet_send();
1753: }
1754: xfree(ctype);
1755: }
1.77 itojun 1756: static void
1.94 markus 1757: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1758: {
1759: Channel *c = NULL;
1.123 djm 1760: int exitval, id, reply, success = 0;
1.48 markus 1761: char *rtype;
1762:
1763: id = packet_get_int();
1764: rtype = packet_get_string(NULL);
1765: reply = packet_get_char();
1766:
1767: debug("client_input_channel_req: channel %d rtype %s reply %d",
1768: id, rtype, reply);
1769:
1.128 djm 1770: if (id == -1) {
1771: error("client_input_channel_req: request for channel -1");
1772: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1773: error("client_input_channel_req: channel %d: unknown channel", id);
1774: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1775: exitval = packet_get_int();
1776: if (id == session_ident) {
1777: success = 1;
1778: exit_status = exitval;
1779: } else if (c->ctl_fd == -1) {
1780: error("client_input_channel_req: unexpected channel %d",
1781: session_ident);
1782: } else {
1783: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1784: success = 1;
1785: }
1.93 markus 1786: packet_check_eom();
1.48 markus 1787: }
1788: if (reply) {
1789: packet_start(success ?
1790: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1791: packet_put_int(id);
1.48 markus 1792: packet_send();
1793: }
1794: xfree(rtype);
1795: }
1.95 markus 1796: static void
1797: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1798: {
1799: char *rtype;
1800: int want_reply;
1801: int success = 0;
1802:
1803: rtype = packet_get_string(NULL);
1804: want_reply = packet_get_char();
1.117 markus 1805: debug("client_input_global_request: rtype %s want_reply %d",
1806: rtype, want_reply);
1.95 markus 1807: if (want_reply) {
1808: packet_start(success ?
1809: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1810: packet_send();
1811: packet_write_wait();
1812: }
1813: xfree(rtype);
1814: }
1.22 markus 1815:
1.123 djm 1816: void
1.129 deraadt 1817: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1818: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1819: dispatch_fn *subsys_repl)
1820: {
1821: int len;
1.132 djm 1822: Channel *c = NULL;
1.123 djm 1823:
1824: debug2("%s: id %d", __func__, id);
1825:
1.132 djm 1826: if ((c = channel_lookup(id)) == NULL)
1827: fatal("client_session2_setup: channel %d: unknown channel", id);
1828:
1.123 djm 1829: if (want_tty) {
1830: struct winsize ws;
1831: struct termios tio;
1832:
1833: /* Store window size in the packet. */
1834: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1835: memset(&ws, 0, sizeof(ws));
1836:
1837: channel_request_start(id, "pty-req", 0);
1838: packet_put_cstring(term != NULL ? term : "");
1839: packet_put_int(ws.ws_col);
1840: packet_put_int(ws.ws_row);
1841: packet_put_int(ws.ws_xpixel);
1842: packet_put_int(ws.ws_ypixel);
1843: tio = get_saved_tio();
1844: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1845: packet_send();
1846: /* XXX wait for reply */
1.132 djm 1847: c->client_tty = 1;
1.123 djm 1848: }
1849:
1850: /* Transfer any environment variables from client to server */
1.126 djm 1851: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1852: int i, j, matched;
1853: char *name, *val;
1854:
1855: debug("Sending environment.");
1.126 djm 1856: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1857: /* Split */
1.126 djm 1858: name = xstrdup(env[i]);
1.123 djm 1859: if ((val = strchr(name, '=')) == NULL) {
1860: free(name);
1861: continue;
1862: }
1863: *val++ = '\0';
1864:
1865: matched = 0;
1866: for (j = 0; j < options.num_send_env; j++) {
1867: if (match_pattern(name, options.send_env[j])) {
1868: matched = 1;
1869: break;
1870: }
1871: }
1872: if (!matched) {
1873: debug3("Ignored env %s", name);
1874: free(name);
1875: continue;
1876: }
1877:
1878: debug("Sending env %s = %s", name, val);
1879: channel_request_start(id, "env", 0);
1880: packet_put_cstring(name);
1881: packet_put_cstring(val);
1882: packet_send();
1883: free(name);
1884: }
1885: }
1886:
1887: len = buffer_len(cmd);
1888: if (len > 0) {
1889: if (len > 900)
1890: len = 900;
1891: if (want_subsystem) {
1892: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1893: channel_request_start(id, "subsystem", subsys_repl != NULL);
1894: if (subsys_repl != NULL) {
1895: /* register callback for reply */
1896: /* XXX we assume that client_loop has already been called */
1897: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1898: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1899: }
1900: } else {
1901: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1902: channel_request_start(id, "exec", 0);
1903: }
1904: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1905: packet_send();
1906: } else {
1907: channel_request_start(id, "shell", 0);
1908: packet_send();
1909: }
1910: }
1911:
1.77 itojun 1912: static void
1.49 itojun 1913: client_init_dispatch_20(void)
1.16 markus 1914: {
1.55 markus 1915: dispatch_init(&dispatch_protocol_error);
1.100 markus 1916:
1.16 markus 1917: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1918: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1919: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1920: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1921: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1922: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1923: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1924: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1925: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1926: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1927:
1928: /* rekeying */
1929: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1930:
1931: /* global request reply messages */
1932: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1933: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1934: }
1.77 itojun 1935: static void
1.49 itojun 1936: client_init_dispatch_13(void)
1.15 markus 1937: {
1938: dispatch_init(NULL);
1939: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1940: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1941: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1942: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1943: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1944: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1945: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1946: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1947: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1948:
1949: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1950: &client_input_agent_open : &deny_input_open);
1.39 markus 1951: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1952: &x11_input_open : &deny_input_open);
1.15 markus 1953: }
1.77 itojun 1954: static void
1.49 itojun 1955: client_init_dispatch_15(void)
1.15 markus 1956: {
1957: client_init_dispatch_13();
1958: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1959: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1960: }
1.79 stevesk 1961: static void
1.49 itojun 1962: client_init_dispatch(void)
1.15 markus 1963: {
1.16 markus 1964: if (compat20)
1965: client_init_dispatch_20();
1966: else if (compat13)
1.15 markus 1967: client_init_dispatch_13();
1968: else
1969: client_init_dispatch_15();
1.113 markus 1970: }
1971:
1972: /* client specific fatal cleanup */
1973: void
1.114 markus 1974: cleanup_exit(int i)
1.113 markus 1975: {
1976: leave_raw_mode();
1977: leave_non_blocking();
1.123 djm 1978: if (options.control_path != NULL && control_fd != -1)
1979: unlink(options.control_path);
1.114 markus 1980: _exit(i);
1.1 deraadt 1981: }
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