Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.266
1.266 ! deraadt 1: /* $OpenBSD: clientloop.c,v 1.265 2015/01/19 20:16:15 markus Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.266 ! deraadt 63: #include <sys/param.h> /* MIN MAX */
1.175 deraadt 64: #include <sys/types.h>
1.152 stevesk 65: #include <sys/ioctl.h>
1.154 stevesk 66: #include <sys/stat.h>
1.166 stevesk 67: #include <sys/socket.h>
1.171 stevesk 68: #include <sys/time.h>
1.189 djm 69: #include <sys/queue.h>
1.150 stevesk 70:
1.155 stevesk 71: #include <ctype.h>
1.168 stevesk 72: #include <errno.h>
1.151 stevesk 73: #include <paths.h>
1.153 stevesk 74: #include <signal.h>
1.174 stevesk 75: #include <stdio.h>
1.173 stevesk 76: #include <stdlib.h>
1.170 stevesk 77: #include <string.h>
1.150 stevesk 78: #include <termios.h>
1.175 deraadt 79: #include <pwd.h>
1.169 stevesk 80: #include <unistd.h>
1.266 ! deraadt 81: #include <limits.h>
1.1 deraadt 82:
1.175 deraadt 83: #include "xmalloc.h"
1.45 markus 84: #include "ssh.h"
85: #include "ssh1.h"
86: #include "ssh2.h"
1.1 deraadt 87: #include "packet.h"
88: #include "buffer.h"
1.15 markus 89: #include "compat.h"
1.74 markus 90: #include "channels.h"
1.15 markus 91: #include "dispatch.h"
1.40 markus 92: #include "key.h"
1.175 deraadt 93: #include "cipher.h"
1.54 markus 94: #include "kex.h"
1.45 markus 95: #include "log.h"
1.261 millert 96: #include "misc.h"
1.45 markus 97: #include "readconf.h"
98: #include "clientloop.h"
1.147 djm 99: #include "sshconnect.h"
1.40 markus 100: #include "authfd.h"
1.45 markus 101: #include "atomicio.h"
1.118 deraadt 102: #include "sshpty.h"
1.123 djm 103: #include "match.h"
104: #include "msg.h"
1.212 andreas 105: #include "roaming.h"
1.262 djm 106: #include "ssherr.h"
1.39 markus 107:
108: /* import options */
109: extern Options options;
110:
1.1 deraadt 111: /* Flag indicating that stdin should be redirected from /dev/null. */
112: extern int stdin_null_flag;
113:
1.116 dtucker 114: /* Flag indicating that no shell has been requested */
115: extern int no_shell_flag;
116:
1.123 djm 117: /* Control socket */
1.217 djm 118: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 119:
1.13 markus 120: /*
121: * Name of the host we are connecting to. This is the name given on the
122: * command line, or the HostName specified for the user-supplied name in a
123: * configuration file.
124: */
1.1 deraadt 125: extern char *host;
126:
1.13 markus 127: /*
128: * Flag to indicate that we have received a window change signal which has
129: * not yet been processed. This will cause a message indicating the new
130: * window size to be sent to the server a little later. This is volatile
131: * because this is updated in a signal handler.
132: */
1.88 markus 133: static volatile sig_atomic_t received_window_change_signal = 0;
134: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 135:
1.145 djm 136: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 137: static int in_non_blocking_mode = 0;
138:
1.222 djm 139: /* Time when backgrounded control master using ControlPersist should exit */
140: static time_t control_persist_exit_time = 0;
141:
1.1 deraadt 142: /* Common data for the client loop code. */
1.217 djm 143: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.195 djm 144: static int escape_char1; /* Escape character. (proto1 only) */
145: static int escape_pending1; /* Last character was an escape (proto1 only) */
1.11 markus 146: static int last_was_cr; /* Last character was a newline. */
1.197 djm 147: static int exit_status; /* Used to store the command exit status. */
148: static int stdin_eof; /* EOF has been encountered on stderr. */
1.11 markus 149: static Buffer stdin_buffer; /* Buffer for stdin data. */
150: static Buffer stdout_buffer; /* Buffer for stdout data. */
151: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.221 djm 152: static u_int buffer_high; /* Soft max buffer size. */
1.11 markus 153: static int connection_in; /* Connection to server (input). */
154: static int connection_out; /* Connection to server (output). */
1.56 markus 155: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 156: static int session_closed; /* In SSH2: login session closed. */
157: static int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.1 deraadt 158:
1.77 itojun 159: static void client_init_dispatch(void);
1.16 markus 160: int session_ident = -1;
161:
1.214 andreas 162: int session_resumed = 0;
163:
1.195 djm 164: /* Track escape per proto2 channel */
165: struct escape_filter_ctx {
166: int escape_pending;
167: int escape_char;
168: };
169:
170: /* Context for channel confirmation replies */
1.190 djm 171: struct channel_reply_ctx {
172: const char *request_type;
1.234 djm 173: int id;
174: enum confirm_action action;
1.190 djm 175: };
176:
1.196 djm 177: /* Global request success/failure callbacks */
178: struct global_confirm {
179: TAILQ_ENTRY(global_confirm) entry;
180: global_confirm_cb *cb;
181: void *ctx;
182: int ref_count;
183: };
184: TAILQ_HEAD(global_confirms, global_confirm);
185: static struct global_confirms global_confirms =
186: TAILQ_HEAD_INITIALIZER(global_confirms);
187:
1.123 djm 188: void ssh_process_session2_setup(int, int, int, Buffer *);
189:
1.1 deraadt 190: /* Restores stdin to blocking mode. */
191:
1.77 itojun 192: static void
1.49 itojun 193: leave_non_blocking(void)
1.1 deraadt 194: {
1.11 markus 195: if (in_non_blocking_mode) {
1.125 djm 196: unset_nonblock(fileno(stdin));
1.11 markus 197: in_non_blocking_mode = 0;
198: }
1.1 deraadt 199: }
200:
1.11 markus 201: /* Puts stdin terminal in non-blocking mode. */
202:
1.77 itojun 203: static void
1.49 itojun 204: enter_non_blocking(void)
1.1 deraadt 205: {
1.11 markus 206: in_non_blocking_mode = 1;
1.124 djm 207: set_nonblock(fileno(stdin));
1.1 deraadt 208: }
209:
1.13 markus 210: /*
211: * Signal handler for the window change signal (SIGWINCH). This just sets a
212: * flag indicating that the window has changed.
213: */
1.157 deraadt 214: /*ARGSUSED */
1.77 itojun 215: static void
1.11 markus 216: window_change_handler(int sig)
1.1 deraadt 217: {
1.11 markus 218: received_window_change_signal = 1;
219: signal(SIGWINCH, window_change_handler);
1.1 deraadt 220: }
221:
1.13 markus 222: /*
223: * Signal handler for signals that cause the program to terminate. These
224: * signals must be trapped to restore terminal modes.
225: */
1.157 deraadt 226: /*ARGSUSED */
1.77 itojun 227: static void
1.11 markus 228: signal_handler(int sig)
1.1 deraadt 229: {
1.75 markus 230: received_signal = sig;
231: quit_pending = 1;
1.1 deraadt 232: }
233:
1.13 markus 234: /*
235: * Returns current time in seconds from Jan 1, 1970 with the maximum
236: * available resolution.
237: */
1.1 deraadt 238:
1.77 itojun 239: static double
1.49 itojun 240: get_current_time(void)
1.1 deraadt 241: {
1.11 markus 242: struct timeval tv;
243: gettimeofday(&tv, NULL);
244: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 245: }
246:
1.222 djm 247: /*
248: * Sets control_persist_exit_time to the absolute time when the
249: * backgrounded control master should exit due to expiry of the
250: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
251: * control master process, or if there is no ControlPersist timeout.
252: */
253: static void
254: set_control_persist_exit_time(void)
255: {
256: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 257: || options.control_persist_timeout == 0) {
1.222 djm 258: /* not using a ControlPersist timeout */
259: control_persist_exit_time = 0;
1.232 djm 260: } else if (channel_still_open()) {
1.222 djm 261: /* some client connections are still open */
262: if (control_persist_exit_time > 0)
263: debug2("%s: cancel scheduled exit", __func__);
264: control_persist_exit_time = 0;
265: } else if (control_persist_exit_time <= 0) {
266: /* a client connection has recently closed */
1.251 dtucker 267: control_persist_exit_time = monotime() +
1.222 djm 268: (time_t)options.control_persist_timeout;
269: debug2("%s: schedule exit in %d seconds", __func__,
270: options.control_persist_timeout);
271: }
272: /* else we are already counting down to the timeout */
273: }
274:
1.238 dtucker 275: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
276: static int
277: client_x11_display_valid(const char *display)
278: {
279: size_t i, dlen;
280:
281: dlen = strlen(display);
282: for (i = 0; i < dlen; i++) {
1.256 deraadt 283: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 284: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
285: debug("Invalid character '%c' in DISPLAY", display[i]);
286: return 0;
287: }
288: }
289: return 1;
290: }
291:
1.138 djm 292: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
293: void
294: client_x11_get_proto(const char *display, const char *xauth_path,
1.221 djm 295: u_int trusted, u_int timeout, char **_proto, char **_data)
1.138 djm 296: {
297: char cmd[1024];
298: char line[512];
299: char xdisplay[512];
300: static char proto[512], data[512];
301: FILE *f;
302: int got_data = 0, generated = 0, do_unlink = 0, i;
303: char *xauthdir, *xauthfile;
304: struct stat st;
1.221 djm 305: u_int now;
1.138 djm 306:
307: xauthdir = xauthfile = NULL;
308: *_proto = proto;
309: *_data = data;
310: proto[0] = data[0] = '\0';
311:
312: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
313: debug("No xauth program.");
1.238 dtucker 314: } else if (!client_x11_display_valid(display)) {
315: logit("DISPLAY '%s' invalid, falling back to fake xauth data",
316: display);
1.138 djm 317: } else {
318: if (display == NULL) {
319: debug("x11_get_proto: DISPLAY not set");
320: return;
321: }
322: /*
323: * Handle FamilyLocal case where $DISPLAY does
324: * not match an authorization entry. For this we
325: * just try "xauth list unix:displaynum.screennum".
326: * XXX: "localhost" match to determine FamilyLocal
327: * is not perfect.
328: */
329: if (strncmp(display, "localhost:", 10) == 0) {
330: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
331: display + 10);
332: display = xdisplay;
333: }
334: if (trusted == 0) {
1.266 ! deraadt 335: xauthdir = xmalloc(PATH_MAX);
! 336: xauthfile = xmalloc(PATH_MAX);
! 337: mktemp_proto(xauthdir, PATH_MAX);
1.138 djm 338: if (mkdtemp(xauthdir) != NULL) {
339: do_unlink = 1;
1.266 ! deraadt 340: snprintf(xauthfile, PATH_MAX, "%s/xauthfile",
1.138 djm 341: xauthdir);
342: snprintf(cmd, sizeof(cmd),
343: "%s -f %s generate %s " SSH_X11_PROTO
1.221 djm 344: " untrusted timeout %u 2>" _PATH_DEVNULL,
345: xauth_path, xauthfile, display, timeout);
1.138 djm 346: debug2("x11_get_proto: %s", cmd);
347: if (system(cmd) == 0)
348: generated = 1;
1.221 djm 349: if (x11_refuse_time == 0) {
1.251 dtucker 350: now = monotime() + 1;
1.221 djm 351: if (UINT_MAX - timeout < now)
352: x11_refuse_time = UINT_MAX;
353: else
354: x11_refuse_time = now + timeout;
355: }
1.138 djm 356: }
357: }
1.181 markus 358:
359: /*
360: * When in untrusted mode, we read the cookie only if it was
361: * successfully generated as an untrusted one in the step
362: * above.
363: */
364: if (trusted || generated) {
365: snprintf(cmd, sizeof(cmd),
366: "%s %s%s list %s 2>" _PATH_DEVNULL,
367: xauth_path,
368: generated ? "-f " : "" ,
369: generated ? xauthfile : "",
370: display);
371: debug2("x11_get_proto: %s", cmd);
372: f = popen(cmd, "r");
373: if (f && fgets(line, sizeof(line), f) &&
374: sscanf(line, "%*s %511s %511s", proto, data) == 2)
375: got_data = 1;
376: if (f)
377: pclose(f);
378: } else
379: error("Warning: untrusted X11 forwarding setup failed: "
380: "xauth key data not generated");
1.138 djm 381: }
382:
383: if (do_unlink) {
384: unlink(xauthfile);
385: rmdir(xauthdir);
386: }
1.250 djm 387: free(xauthdir);
388: free(xauthfile);
1.138 djm 389:
390: /*
391: * If we didn't get authentication data, just make up some
392: * data. The forwarding code will check the validity of the
393: * response anyway, and substitute this data. The X11
394: * server, however, will ignore this fake data and use
395: * whatever authentication mechanisms it was using otherwise
396: * for the local connection.
397: */
398: if (!got_data) {
399: u_int32_t rnd = 0;
400:
401: logit("Warning: No xauth data; "
402: "using fake authentication data for X11 forwarding.");
403: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
404: for (i = 0; i < 16; i++) {
405: if (i % 4 == 0)
406: rnd = arc4random();
407: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
408: rnd & 0xff);
409: rnd >>= 8;
410: }
411: }
1.1 deraadt 412: }
413:
1.13 markus 414: /*
415: * This is called when the interactive is entered. This checks if there is
416: * an EOF coming on stdin. We must check this explicitly, as select() does
417: * not appear to wake up when redirecting from /dev/null.
418: */
1.1 deraadt 419:
1.77 itojun 420: static void
1.49 itojun 421: client_check_initial_eof_on_stdin(void)
1.1 deraadt 422: {
1.11 markus 423: int len;
424: char buf[1];
1.1 deraadt 425:
1.13 markus 426: /*
427: * If standard input is to be "redirected from /dev/null", we simply
428: * mark that we have seen an EOF and send an EOF message to the
429: * server. Otherwise, we try to read a single character; it appears
430: * that for some files, such /dev/null, select() never wakes up for
431: * read for this descriptor, which means that we never get EOF. This
432: * way we will get the EOF if stdin comes from /dev/null or similar.
433: */
1.11 markus 434: if (stdin_null_flag) {
435: /* Fake EOF on stdin. */
436: debug("Sending eof.");
437: stdin_eof = 1;
438: packet_start(SSH_CMSG_EOF);
439: packet_send();
440: } else {
441: enter_non_blocking();
442:
443: /* Check for immediate EOF on stdin. */
444: len = read(fileno(stdin), buf, 1);
445: if (len == 0) {
1.197 djm 446: /*
447: * EOF. Record that we have seen it and send
448: * EOF to server.
449: */
1.11 markus 450: debug("Sending eof.");
451: stdin_eof = 1;
452: packet_start(SSH_CMSG_EOF);
453: packet_send();
454: } else if (len > 0) {
1.13 markus 455: /*
456: * Got data. We must store the data in the buffer,
457: * and also process it as an escape character if
458: * appropriate.
459: */
1.195 djm 460: if ((u_char) buf[0] == escape_char1)
461: escape_pending1 = 1;
1.52 markus 462: else
1.11 markus 463: buffer_append(&stdin_buffer, buf, 1);
464: }
465: leave_non_blocking();
466: }
1.1 deraadt 467: }
468:
469:
1.13 markus 470: /*
471: * Make packets from buffered stdin data, and buffer them for sending to the
472: * connection.
473: */
1.1 deraadt 474:
1.77 itojun 475: static void
1.49 itojun 476: client_make_packets_from_stdin_data(void)
1.1 deraadt 477: {
1.42 markus 478: u_int len;
1.1 deraadt 479:
1.11 markus 480: /* Send buffered stdin data to the server. */
481: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 482: packet_not_very_much_data_to_write()) {
1.11 markus 483: len = buffer_len(&stdin_buffer);
484: /* Keep the packets at reasonable size. */
485: if (len > packet_get_maxsize())
486: len = packet_get_maxsize();
487: packet_start(SSH_CMSG_STDIN_DATA);
488: packet_put_string(buffer_ptr(&stdin_buffer), len);
489: packet_send();
490: buffer_consume(&stdin_buffer, len);
491: /* If we have a pending EOF, send it now. */
492: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
493: packet_start(SSH_CMSG_EOF);
494: packet_send();
495: }
1.1 deraadt 496: }
497: }
498:
1.13 markus 499: /*
500: * Checks if the client window has changed, and sends a packet about it to
501: * the server if so. The actual change is detected elsewhere (by a software
502: * interrupt on Unix); this just checks the flag and sends a message if
503: * appropriate.
504: */
1.1 deraadt 505:
1.77 itojun 506: static void
1.49 itojun 507: client_check_window_change(void)
1.1 deraadt 508: {
1.16 markus 509: struct winsize ws;
510:
511: if (! received_window_change_signal)
512: return;
513: /** XXX race */
514: received_window_change_signal = 0;
515:
1.37 markus 516: debug2("client_check_window_change: changed");
1.16 markus 517:
518: if (compat20) {
1.123 djm 519: channel_send_window_changes();
1.16 markus 520: } else {
1.123 djm 521: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
522: return;
1.16 markus 523: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 524: packet_put_int((u_int)ws.ws_row);
525: packet_put_int((u_int)ws.ws_col);
526: packet_put_int((u_int)ws.ws_xpixel);
527: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 528: packet_send();
1.1 deraadt 529: }
530: }
531:
1.264 markus 532: static int
1.117 markus 533: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
534: {
1.196 djm 535: struct global_confirm *gc;
536:
537: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 538: return 0;
1.196 djm 539: if (gc->cb != NULL)
540: gc->cb(type, seq, gc->ctx);
541: if (--gc->ref_count <= 0) {
542: TAILQ_REMOVE(&global_confirms, gc, entry);
1.257 tedu 543: explicit_bzero(gc, sizeof(*gc));
1.250 djm 544: free(gc);
1.196 djm 545: }
546:
1.210 andreas 547: packet_set_alive_timeouts(0);
1.264 markus 548: return 0;
1.117 markus 549: }
550:
551: static void
552: server_alive_check(void)
553: {
1.210 andreas 554: if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
1.228 djm 555: logit("Timeout, server %s not responding.", host);
1.176 markus 556: cleanup_exit(255);
557: }
1.117 markus 558: packet_start(SSH2_MSG_GLOBAL_REQUEST);
559: packet_put_cstring("keepalive@openssh.com");
560: packet_put_char(1); /* boolean: want reply */
561: packet_send();
1.196 djm 562: /* Insert an empty placeholder to maintain ordering */
563: client_register_global_confirm(NULL, NULL);
1.117 markus 564: }
565:
1.13 markus 566: /*
567: * Waits until the client can do something (some data becomes available on
568: * one of the file descriptors).
569: */
1.77 itojun 570: static void
1.46 markus 571: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 572: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 573: {
1.117 markus 574: struct timeval tv, *tvp;
1.222 djm 575: int timeout_secs;
1.251 dtucker 576: time_t minwait_secs = 0, server_alive_time = 0, now = monotime();
1.117 markus 577: int ret;
578:
1.46 markus 579: /* Add any selections by the channel mechanism. */
1.239 djm 580: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp,
581: &minwait_secs, rekeying);
1.11 markus 582:
1.16 markus 583: if (!compat20) {
1.17 markus 584: /* Read from the connection, unless our buffers are full. */
1.16 markus 585: if (buffer_len(&stdout_buffer) < buffer_high &&
586: buffer_len(&stderr_buffer) < buffer_high &&
587: channel_not_very_much_buffered_data())
1.46 markus 588: FD_SET(connection_in, *readsetp);
1.17 markus 589: /*
590: * Read from stdin, unless we have seen EOF or have very much
591: * buffered data to send to the server.
592: */
593: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 594: FD_SET(fileno(stdin), *readsetp);
1.17 markus 595:
596: /* Select stdout/stderr if have data in buffer. */
597: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 598: FD_SET(fileno(stdout), *writesetp);
1.17 markus 599: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 600: FD_SET(fileno(stderr), *writesetp);
1.16 markus 601: } else {
1.71 markus 602: /* channel_prepare_select could have closed the last channel */
1.84 markus 603: if (session_closed && !channel_still_open() &&
604: !packet_have_data_to_write()) {
605: /* clear mask since we did not call select() */
1.87 markus 606: memset(*readsetp, 0, *nallocp);
607: memset(*writesetp, 0, *nallocp);
1.84 markus 608: return;
1.71 markus 609: } else {
610: FD_SET(connection_in, *readsetp);
611: }
1.16 markus 612: }
1.11 markus 613:
614: /* Select server connection if have data to write to the server. */
615: if (packet_have_data_to_write())
1.46 markus 616: FD_SET(connection_out, *writesetp);
1.11 markus 617:
1.13 markus 618: /*
619: * Wait for something to happen. This will suspend the process until
620: * some selected descriptor can be read, written, or has some other
1.222 djm 621: * event pending, or a timeout expires.
1.13 markus 622: */
1.11 markus 623:
1.222 djm 624: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.249 dtucker 625: if (options.server_alive_interval > 0 && compat20) {
1.222 djm 626: timeout_secs = options.server_alive_interval;
1.249 dtucker 627: server_alive_time = now + options.server_alive_interval;
628: }
629: if (options.rekey_interval > 0 && compat20 && !rekeying)
630: timeout_secs = MIN(timeout_secs, packet_get_rekey_timeout());
1.222 djm 631: set_control_persist_exit_time();
632: if (control_persist_exit_time > 0) {
633: timeout_secs = MIN(timeout_secs,
1.249 dtucker 634: control_persist_exit_time - now);
1.222 djm 635: if (timeout_secs < 0)
636: timeout_secs = 0;
637: }
1.239 djm 638: if (minwait_secs != 0)
639: timeout_secs = MIN(timeout_secs, (int)minwait_secs);
1.222 djm 640: if (timeout_secs == INT_MAX)
1.117 markus 641: tvp = NULL;
1.129 deraadt 642: else {
1.222 djm 643: tv.tv_sec = timeout_secs;
1.117 markus 644: tv.tv_usec = 0;
645: tvp = &tv;
646: }
1.222 djm 647:
1.117 markus 648: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
649: if (ret < 0) {
1.11 markus 650: char buf[100];
1.51 markus 651:
652: /*
653: * We have to clear the select masks, because we return.
654: * We have to return, because the mainloop checks for the flags
655: * set by the signal handlers.
656: */
1.87 markus 657: memset(*readsetp, 0, *nallocp);
658: memset(*writesetp, 0, *nallocp);
1.50 deraadt 659:
1.11 markus 660: if (errno == EINTR)
661: return;
662: /* Note: we might still have data in the buffers. */
663: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
664: buffer_append(&stderr_buffer, buf, strlen(buf));
665: quit_pending = 1;
1.249 dtucker 666: } else if (ret == 0) {
667: /*
668: * Timeout. Could have been either keepalive or rekeying.
669: * Keepalive we check here, rekeying is checked in clientloop.
670: */
1.251 dtucker 671: if (server_alive_time != 0 && server_alive_time <= monotime())
1.249 dtucker 672: server_alive_check();
673: }
674:
1.11 markus 675: }
676:
1.77 itojun 677: static void
1.31 markus 678: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 679: {
1.11 markus 680: /* Flush stdout and stderr buffers. */
1.31 markus 681: if (buffer_len(bout) > 0)
1.197 djm 682: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
683: buffer_len(bout));
1.31 markus 684: if (buffer_len(berr) > 0)
1.197 djm 685: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
686: buffer_len(berr));
1.11 markus 687:
1.233 djm 688: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 689:
1.13 markus 690: /*
691: * Free (and clear) the buffer to reduce the amount of data that gets
692: * written to swap.
693: */
1.31 markus 694: buffer_free(bin);
695: buffer_free(bout);
696: buffer_free(berr);
1.11 markus 697:
698: /* Send the suspend signal to the program itself. */
699: kill(getpid(), SIGTSTP);
700:
1.132 djm 701: /* Reset window sizes in case they have changed */
702: received_window_change_signal = 1;
1.11 markus 703:
704: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 705: buffer_init(bin);
706: buffer_init(bout);
707: buffer_init(berr);
1.11 markus 708:
1.233 djm 709: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 710: }
711:
1.77 itojun 712: static void
1.161 deraadt 713: client_process_net_input(fd_set *readset)
1.11 markus 714: {
1.212 andreas 715: int len, cont = 0;
1.17 markus 716: char buf[8192];
1.11 markus 717:
1.13 markus 718: /*
719: * Read input from the server, and add any such data to the buffer of
720: * the packet subsystem.
721: */
1.11 markus 722: if (FD_ISSET(connection_in, readset)) {
723: /* Read as much as possible. */
1.212 andreas 724: len = roaming_read(connection_in, buf, sizeof(buf), &cont);
725: if (len == 0 && cont == 0) {
1.197 djm 726: /*
727: * Received EOF. The remote host has closed the
728: * connection.
729: */
730: snprintf(buf, sizeof buf,
731: "Connection to %.300s closed by remote host.\r\n",
732: host);
1.1 deraadt 733: buffer_append(&stderr_buffer, buf, strlen(buf));
734: quit_pending = 1;
735: return;
1.11 markus 736: }
1.13 markus 737: /*
738: * There is a kernel bug on Solaris that causes select to
739: * sometimes wake up even though there is no data available.
740: */
1.53 millert 741: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 742: len = 0;
743:
744: if (len < 0) {
1.197 djm 745: /*
746: * An error has encountered. Perhaps there is a
747: * network problem.
748: */
749: snprintf(buf, sizeof buf,
750: "Read from remote host %.300s: %.100s\r\n",
751: host, strerror(errno));
1.11 markus 752: buffer_append(&stderr_buffer, buf, strlen(buf));
753: quit_pending = 1;
754: return;
755: }
756: packet_process_incoming(buf, len);
757: }
1.17 markus 758: }
1.16 markus 759:
1.97 jakob 760: static void
1.190 djm 761: client_status_confirm(int type, Channel *c, void *ctx)
1.123 djm 762: {
1.190 djm 763: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
764: char errmsg[256];
765: int tochan;
766:
1.234 djm 767: /*
768: * If a TTY was explicitly requested, then a failure to allocate
769: * one is fatal.
770: */
771: if (cr->action == CONFIRM_TTY &&
772: (options.request_tty == REQUEST_TTY_FORCE ||
773: options.request_tty == REQUEST_TTY_YES))
774: cr->action = CONFIRM_CLOSE;
775:
1.190 djm 776: /* XXX supress on mux _client_ quietmode */
777: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 778: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 779:
780: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
781: debug2("%s request accepted on channel %d",
782: cr->request_type, c->self);
783: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
784: if (tochan) {
785: snprintf(errmsg, sizeof(errmsg),
786: "%s request failed\r\n", cr->request_type);
787: } else {
788: snprintf(errmsg, sizeof(errmsg),
789: "%s request failed on channel %d",
790: cr->request_type, c->self);
791: }
792: /* If error occurred on primary session channel, then exit */
1.234 djm 793: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 794: fatal("%s", errmsg);
1.234 djm 795: /*
796: * If error occurred on mux client, append to
797: * their stderr.
798: */
799: if (tochan) {
800: buffer_append(&c->extended, errmsg,
801: strlen(errmsg));
802: } else
1.190 djm 803: error("%s", errmsg);
1.234 djm 804: if (cr->action == CONFIRM_TTY) {
805: /*
806: * If a TTY allocation error occurred, then arrange
807: * for the correct TTY to leave raw mode.
808: */
809: if (c->self == session_ident)
810: leave_raw_mode(0);
811: else
812: mux_tty_alloc_failed(c);
813: } else if (cr->action == CONFIRM_CLOSE) {
1.190 djm 814: chan_read_failed(c);
815: chan_write_failed(c);
816: }
817: }
1.250 djm 818: free(cr);
1.190 djm 819: }
820:
821: static void
822: client_abandon_status_confirm(Channel *c, void *ctx)
823: {
1.250 djm 824: free(ctx);
1.190 djm 825: }
1.129 deraadt 826:
1.236 djm 827: void
1.234 djm 828: client_expect_confirm(int id, const char *request,
829: enum confirm_action action)
1.190 djm 830: {
1.255 djm 831: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 832:
1.190 djm 833: cr->request_type = request;
1.234 djm 834: cr->action = action;
1.123 djm 835:
1.190 djm 836: channel_register_status_confirm(id, client_status_confirm,
837: client_abandon_status_confirm, cr);
1.196 djm 838: }
839:
840: void
841: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
842: {
1.201 djm 843: struct global_confirm *gc, *last_gc;
1.196 djm 844:
845: /* Coalesce identical callbacks */
1.201 djm 846: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
847: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
848: if (++last_gc->ref_count >= INT_MAX)
849: fatal("%s: last_gc->ref_count = %d",
850: __func__, last_gc->ref_count);
1.196 djm 851: return;
852: }
853:
1.255 djm 854: gc = xcalloc(1, sizeof(*gc));
1.196 djm 855: gc->cb = cb;
856: gc->ctx = ctx;
857: gc->ref_count = 1;
858: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 859: }
860:
861: static void
1.99 markus 862: process_cmdline(void)
1.97 jakob 863: {
864: void (*handler)(int);
1.261 millert 865: char *s, *cmd;
866: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
867: struct Forward fwd;
1.97 jakob 868:
1.257 tedu 869: memset(&fwd, 0, sizeof(fwd));
1.183 djm 870:
1.233 djm 871: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 872: handler = signal(SIGINT, SIG_IGN);
1.99 markus 873: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 874: if (s == NULL)
875: goto out;
1.256 deraadt 876: while (isspace((u_char)*s))
1.97 jakob 877: s++;
1.121 djm 878: if (*s == '-')
879: s++; /* Skip cmdline '-', if any */
1.120 dtucker 880: if (*s == '\0')
1.97 jakob 881: goto out;
1.121 djm 882:
1.122 djm 883: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 884: logit("Commands:");
1.164 djm 885: logit(" -L[bind_address:]port:host:hostport "
886: "Request local forward");
887: logit(" -R[bind_address:]port:host:hostport "
888: "Request remote forward");
1.204 stevesk 889: logit(" -D[bind_address:]port "
890: "Request dynamic forward");
1.237 markus 891: logit(" -KL[bind_address:]port "
892: "Cancel local forward");
1.165 stevesk 893: logit(" -KR[bind_address:]port "
1.164 djm 894: "Cancel remote forward");
1.237 markus 895: logit(" -KD[bind_address:]port "
896: "Cancel dynamic forward");
1.146 reyk 897: if (!options.permit_local_command)
898: goto out;
1.164 djm 899: logit(" !args "
900: "Execute local command");
1.146 reyk 901: goto out;
902: }
903:
904: if (*s == '!' && options.permit_local_command) {
905: s++;
906: ssh_local_cmd(s);
1.121 djm 907: goto out;
908: }
909:
910: if (*s == 'K') {
911: delete = 1;
912: s++;
913: }
1.204 stevesk 914: if (*s == 'L')
915: local = 1;
916: else if (*s == 'R')
917: remote = 1;
918: else if (*s == 'D')
919: dynamic = 1;
920: else {
1.109 itojun 921: logit("Invalid command.");
1.97 jakob 922: goto out;
923: }
1.204 stevesk 924:
1.237 markus 925: if (delete && !compat20) {
1.109 itojun 926: logit("Not supported for SSH protocol version 1.");
1.97 jakob 927: goto out;
928: }
1.121 djm 929:
1.256 deraadt 930: while (isspace((u_char)*++s))
1.179 tedu 931: ;
1.97 jakob 932:
1.217 djm 933: /* XXX update list of forwards in options */
1.121 djm 934: if (delete) {
1.261 millert 935: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
936: if (!parse_forward(&fwd, s, 1, 0)) {
937: logit("Bad forwarding close specification.");
1.121 djm 938: goto out;
939: }
1.237 markus 940: if (remote)
1.261 millert 941: ok = channel_request_rforward_cancel(&fwd) == 0;
1.237 markus 942: else if (dynamic)
1.261 millert 943: ok = channel_cancel_lport_listener(&fwd,
944: 0, &options.fwd_opts) > 0;
1.237 markus 945: else
1.261 millert 946: ok = channel_cancel_lport_listener(&fwd,
947: CHANNEL_CANCEL_PORT_STATIC,
948: &options.fwd_opts) > 0;
1.237 markus 949: if (!ok) {
950: logit("Unkown port forwarding.");
951: goto out;
952: }
953: logit("Canceled forwarding.");
1.121 djm 954: } else {
1.209 djm 955: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 956: logit("Bad forwarding specification.");
957: goto out;
958: }
1.204 stevesk 959: if (local || dynamic) {
1.261 millert 960: if (!channel_setup_local_fwd_listener(&fwd,
961: &options.fwd_opts)) {
1.121 djm 962: logit("Port forwarding failed.");
963: goto out;
964: }
1.135 djm 965: } else {
1.261 millert 966: if (channel_request_remote_forwarding(&fwd) < 0) {
1.167 markus 967: logit("Port forwarding failed.");
968: goto out;
969: }
1.135 djm 970: }
1.121 djm 971: logit("Forwarding port.");
972: }
973:
1.97 jakob 974: out:
975: signal(SIGINT, handler);
1.233 djm 976: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 977: free(cmd);
978: free(fwd.listen_host);
1.261 millert 979: free(fwd.listen_path);
1.250 djm 980: free(fwd.connect_host);
1.261 millert 981: free(fwd.connect_path);
1.97 jakob 982: }
983:
1.244 dtucker 984: /* reasons to suppress output of an escape command in help output */
985: #define SUPPRESS_NEVER 0 /* never suppress, always show */
986: #define SUPPRESS_PROTO1 1 /* don't show in protocol 1 sessions */
987: #define SUPPRESS_MUXCLIENT 2 /* don't show in mux client sessions */
988: #define SUPPRESS_MUXMASTER 4 /* don't show in mux master sessions */
989: #define SUPPRESS_SYSLOG 8 /* don't show when logging to syslog */
990: struct escape_help_text {
991: const char *cmd;
992: const char *text;
993: unsigned int flags;
994: };
995: static struct escape_help_text esc_txt[] = {
996: {".", "terminate session", SUPPRESS_MUXMASTER},
997: {".", "terminate connection (and any multiplexed sessions)",
998: SUPPRESS_MUXCLIENT},
999: {"B", "send a BREAK to the remote system", SUPPRESS_PROTO1},
1000: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1001: {"R", "request rekey", SUPPRESS_PROTO1},
1.246 dtucker 1002: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 1003: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
1004: {"#", "list forwarded connections", SUPPRESS_NEVER},
1005: {"&", "background ssh (when waiting for connections to terminate)",
1006: SUPPRESS_MUXCLIENT},
1007: {"?", "this message", SUPPRESS_NEVER},
1008: };
1009:
1010: static void
1011: print_escape_help(Buffer *b, int escape_char, int protocol2, int mux_client,
1012: int using_stderr)
1013: {
1014: unsigned int i, suppress_flags;
1015: char string[1024];
1016:
1017: snprintf(string, sizeof string, "%c?\r\n"
1018: "Supported escape sequences:\r\n", escape_char);
1019: buffer_append(b, string, strlen(string));
1020:
1021: suppress_flags = (protocol2 ? 0 : SUPPRESS_PROTO1) |
1022: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
1023: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
1024: (using_stderr ? 0 : SUPPRESS_SYSLOG);
1025:
1026: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
1027: if (esc_txt[i].flags & suppress_flags)
1028: continue;
1.246 dtucker 1029: snprintf(string, sizeof string, " %c%-3s - %s\r\n",
1.244 dtucker 1030: escape_char, esc_txt[i].cmd, esc_txt[i].text);
1031: buffer_append(b, string, strlen(string));
1032: }
1033:
1034: snprintf(string, sizeof string,
1.246 dtucker 1035: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 1036: "(Note that escapes are only recognized immediately after "
1037: "newline.)\r\n", escape_char, escape_char);
1038: buffer_append(b, string, strlen(string));
1039: }
1040:
1.195 djm 1041: /*
1042: * Process the characters one by one, call with c==NULL for proto1 case.
1043: */
1.77 itojun 1044: static int
1.195 djm 1045: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
1046: char *buf, int len)
1.31 markus 1047: {
1.32 markus 1048: char string[1024];
1.31 markus 1049: pid_t pid;
1050: int bytes = 0;
1.42 markus 1051: u_int i;
1052: u_char ch;
1.31 markus 1053: char *s;
1.195 djm 1054: int *escape_pendingp, escape_char;
1055: struct escape_filter_ctx *efc;
1.31 markus 1056:
1.195 djm 1057: if (c == NULL) {
1058: escape_pendingp = &escape_pending1;
1059: escape_char = escape_char1;
1060: } else {
1061: if (c->filter_ctx == NULL)
1062: return 0;
1063: efc = (struct escape_filter_ctx *)c->filter_ctx;
1064: escape_pendingp = &efc->escape_pending;
1065: escape_char = efc->escape_char;
1066: }
1067:
1.139 djm 1068: if (len <= 0)
1069: return (0);
1070:
1071: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1072: /* Get one character at a time. */
1073: ch = buf[i];
1074:
1.195 djm 1075: if (*escape_pendingp) {
1.31 markus 1076: /* We have previously seen an escape character. */
1077: /* Clear the flag now. */
1.195 djm 1078: *escape_pendingp = 0;
1.31 markus 1079:
1080: /* Process the escaped character. */
1081: switch (ch) {
1082: case '.':
1083: /* Terminate the connection. */
1.195 djm 1084: snprintf(string, sizeof string, "%c.\r\n",
1085: escape_char);
1.32 markus 1086: buffer_append(berr, string, strlen(string));
1.31 markus 1087:
1.217 djm 1088: if (c && c->ctl_chan != -1) {
1.195 djm 1089: chan_read_failed(c);
1090: chan_write_failed(c);
1.252 dtucker 1091: if (c->detach_user)
1092: c->detach_user(c->self, NULL);
1.253 dtucker 1093: c->type = SSH_CHANNEL_ABANDONED;
1094: buffer_clear(&c->input);
1095: chan_ibuf_empty(c);
1.195 djm 1096: return 0;
1097: } else
1098: quit_pending = 1;
1.31 markus 1099: return -1;
1100:
1101: case 'Z' - 64:
1.195 djm 1102: /* XXX support this for mux clients */
1.217 djm 1103: if (c && c->ctl_chan != -1) {
1.245 dtucker 1104: char b[16];
1.195 djm 1105: noescape:
1.245 dtucker 1106: if (ch == 'Z' - 64)
1107: snprintf(b, sizeof b, "^Z");
1108: else
1109: snprintf(b, sizeof b, "%c", ch);
1.195 djm 1110: snprintf(string, sizeof string,
1.245 dtucker 1111: "%c%s escape not available to "
1.195 djm 1112: "multiplexed sessions\r\n",
1.245 dtucker 1113: escape_char, b);
1.195 djm 1114: buffer_append(berr, string,
1115: strlen(string));
1116: continue;
1117: }
1.197 djm 1118: /* Suspend the program. Inform the user */
1.195 djm 1119: snprintf(string, sizeof string,
1120: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 1121: buffer_append(berr, string, strlen(string));
1.31 markus 1122:
1123: /* Restore terminal modes and suspend. */
1124: client_suspend_self(bin, bout, berr);
1125:
1126: /* We have been continued. */
1127: continue;
1128:
1.111 markus 1129: case 'B':
1130: if (compat20) {
1131: snprintf(string, sizeof string,
1132: "%cB\r\n", escape_char);
1133: buffer_append(berr, string,
1134: strlen(string));
1.254 djm 1135: channel_request_start(c->self,
1.111 markus 1136: "break", 0);
1137: packet_put_int(1000);
1138: packet_send();
1139: }
1140: continue;
1141:
1.54 markus 1142: case 'R':
1.59 markus 1143: if (compat20) {
1144: if (datafellows & SSH_BUG_NOREKEY)
1.197 djm 1145: logit("Server does not "
1146: "support re-keying");
1.59 markus 1147: else
1148: need_rekeying = 1;
1149: }
1.54 markus 1150: continue;
1151:
1.242 dtucker 1152: case 'V':
1153: /* FALLTHROUGH */
1154: case 'v':
1155: if (c && c->ctl_chan != -1)
1156: goto noescape;
1157: if (!log_is_on_stderr()) {
1158: snprintf(string, sizeof string,
1159: "%c%c [Logging to syslog]\r\n",
1160: escape_char, ch);
1161: buffer_append(berr, string,
1162: strlen(string));
1163: continue;
1164: }
1165: if (ch == 'V' && options.log_level >
1166: SYSLOG_LEVEL_QUIET)
1167: log_change_level(--options.log_level);
1168: if (ch == 'v' && options.log_level <
1169: SYSLOG_LEVEL_DEBUG3)
1170: log_change_level(++options.log_level);
1171: snprintf(string, sizeof string,
1172: "%c%c [LogLevel %s]\r\n", escape_char, ch,
1173: log_level_name(options.log_level));
1174: buffer_append(berr, string, strlen(string));
1175: continue;
1176:
1.31 markus 1177: case '&':
1.217 djm 1178: if (c && c->ctl_chan != -1)
1.195 djm 1179: goto noescape;
1.31 markus 1180: /*
1.197 djm 1181: * Detach the program (continue to serve
1182: * connections, but put in background and no
1183: * more new connections).
1.31 markus 1184: */
1185: /* Restore tty modes. */
1.233 djm 1186: leave_raw_mode(
1187: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1188:
1189: /* Stop listening for new connections. */
1.86 markus 1190: channel_stop_listening();
1.31 markus 1191:
1.86 markus 1192: snprintf(string, sizeof string,
1193: "%c& [backgrounded]\n", escape_char);
1194: buffer_append(berr, string, strlen(string));
1.31 markus 1195:
1196: /* Fork into background. */
1197: pid = fork();
1198: if (pid < 0) {
1199: error("fork: %.100s", strerror(errno));
1200: continue;
1201: }
1202: if (pid != 0) { /* This is the parent. */
1203: /* The parent just exits. */
1204: exit(0);
1205: }
1206: /* The child continues serving connections. */
1.86 markus 1207: if (compat20) {
1208: buffer_append(bin, "\004", 1);
1209: /* fake EOF on stdin */
1210: return -1;
1211: } else if (!stdin_eof) {
1212: /*
1.197 djm 1213: * Sending SSH_CMSG_EOF alone does not
1214: * always appear to be enough. So we
1215: * try to send an EOF character first.
1.86 markus 1216: */
1217: packet_start(SSH_CMSG_STDIN_DATA);
1218: packet_put_string("\004", 1);
1219: packet_send();
1220: /* Close stdin. */
1221: stdin_eof = 1;
1222: if (buffer_len(bin) == 0) {
1223: packet_start(SSH_CMSG_EOF);
1224: packet_send();
1225: }
1226: }
1227: continue;
1.31 markus 1228:
1229: case '?':
1.244 dtucker 1230: print_escape_help(berr, escape_char, compat20,
1231: (c && c->ctl_chan != -1),
1232: log_is_on_stderr());
1.31 markus 1233: continue;
1234:
1235: case '#':
1.195 djm 1236: snprintf(string, sizeof string, "%c#\r\n",
1237: escape_char);
1.32 markus 1238: buffer_append(berr, string, strlen(string));
1.31 markus 1239: s = channel_open_message();
1240: buffer_append(berr, s, strlen(s));
1.250 djm 1241: free(s);
1.97 jakob 1242: continue;
1243:
1244: case 'C':
1.217 djm 1245: if (c && c->ctl_chan != -1)
1.206 djm 1246: goto noescape;
1.99 markus 1247: process_cmdline();
1.31 markus 1248: continue;
1249:
1250: default:
1251: if (ch != escape_char) {
1252: buffer_put_char(bin, escape_char);
1253: bytes++;
1254: }
1255: /* Escaped characters fall through here */
1256: break;
1257: }
1258: } else {
1259: /*
1.197 djm 1260: * The previous character was not an escape char.
1261: * Check if this is an escape.
1.31 markus 1262: */
1263: if (last_was_cr && ch == escape_char) {
1.197 djm 1264: /*
1265: * It is. Set the flag and continue to
1266: * next character.
1267: */
1.195 djm 1268: *escape_pendingp = 1;
1.31 markus 1269: continue;
1270: }
1271: }
1272:
1273: /*
1274: * Normal character. Record whether it was a newline,
1275: * and append it to the buffer.
1276: */
1277: last_was_cr = (ch == '\r' || ch == '\n');
1278: buffer_put_char(bin, ch);
1279: bytes++;
1280: }
1281: return bytes;
1282: }
1283:
1.77 itojun 1284: static void
1.161 deraadt 1285: client_process_input(fd_set *readset)
1.17 markus 1286: {
1.21 deraadt 1287: int len;
1.31 markus 1288: char buf[8192];
1.16 markus 1289:
1.11 markus 1290: /* Read input from stdin. */
1291: if (FD_ISSET(fileno(stdin), readset)) {
1292: /* Read as much as possible. */
1293: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1294: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1295: return; /* we'll try again later */
1.11 markus 1296: if (len <= 0) {
1.13 markus 1297: /*
1298: * Received EOF or error. They are treated
1299: * similarly, except that an error message is printed
1300: * if it was an error condition.
1301: */
1.11 markus 1302: if (len < 0) {
1.197 djm 1303: snprintf(buf, sizeof buf, "read: %.100s\r\n",
1304: strerror(errno));
1.11 markus 1305: buffer_append(&stderr_buffer, buf, strlen(buf));
1306: }
1307: /* Mark that we have seen EOF. */
1308: stdin_eof = 1;
1.13 markus 1309: /*
1310: * Send an EOF message to the server unless there is
1311: * data in the buffer. If there is data in the
1312: * buffer, no message will be sent now. Code
1313: * elsewhere will send the EOF when the buffer
1314: * becomes empty if stdin_eof is set.
1315: */
1.11 markus 1316: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1317: packet_start(SSH_CMSG_EOF);
1318: packet_send();
1.11 markus 1319: }
1.195 djm 1320: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1321: /*
1322: * Normal successful read, and no escape character.
1323: * Just append the data to buffer.
1324: */
1.11 markus 1325: buffer_append(&stdin_buffer, buf, len);
1326: } else {
1.13 markus 1327: /*
1.197 djm 1328: * Normal, successful read. But we have an escape
1329: * character and have to process the characters one
1330: * by one.
1.13 markus 1331: */
1.195 djm 1332: if (process_escapes(NULL, &stdin_buffer,
1333: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1334: return;
1.11 markus 1335: }
1336: }
1337: }
1338:
1.77 itojun 1339: static void
1.161 deraadt 1340: client_process_output(fd_set *writeset)
1.11 markus 1341: {
1342: int len;
1343: char buf[100];
1.1 deraadt 1344:
1.11 markus 1345: /* Write buffered output to stdout. */
1346: if (FD_ISSET(fileno(stdout), writeset)) {
1347: /* Write as much data as possible. */
1348: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1349: buffer_len(&stdout_buffer));
1.11 markus 1350: if (len <= 0) {
1.64 markus 1351: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1352: len = 0;
1353: else {
1.13 markus 1354: /*
1355: * An error or EOF was encountered. Put an
1356: * error message to stderr buffer.
1357: */
1.197 djm 1358: snprintf(buf, sizeof buf,
1359: "write stdout: %.50s\r\n", strerror(errno));
1.11 markus 1360: buffer_append(&stderr_buffer, buf, strlen(buf));
1361: quit_pending = 1;
1362: return;
1363: }
1364: }
1365: /* Consume printed data from the buffer. */
1366: buffer_consume(&stdout_buffer, len);
1367: }
1368: /* Write buffered output to stderr. */
1369: if (FD_ISSET(fileno(stderr), writeset)) {
1370: /* Write as much data as possible. */
1371: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1372: buffer_len(&stderr_buffer));
1.11 markus 1373: if (len <= 0) {
1.64 markus 1374: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1375: len = 0;
1376: else {
1.197 djm 1377: /*
1378: * EOF or error, but can't even print
1379: * error message.
1380: */
1.11 markus 1381: quit_pending = 1;
1382: return;
1383: }
1384: }
1385: /* Consume printed characters from the buffer. */
1386: buffer_consume(&stderr_buffer, len);
1387: }
1.1 deraadt 1388: }
1389:
1.13 markus 1390: /*
1.15 markus 1391: * Get packets from the connection input buffer, and process them as long as
1392: * there are packets available.
1393: *
1394: * Any unknown packets received during the actual
1395: * session cause the session to terminate. This is
1396: * intended to make debugging easier since no
1397: * confirmations are sent. Any compatible protocol
1398: * extensions must be negotiated during the
1399: * preparatory phase.
1400: */
1401:
1.77 itojun 1402: static void
1.49 itojun 1403: client_process_buffered_input_packets(void)
1.15 markus 1404: {
1.265 markus 1405: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, active_state);
1.15 markus 1406: }
1407:
1.31 markus 1408: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1409:
1.195 djm 1410: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1411: void *
1412: client_new_escape_filter_ctx(int escape_char)
1413: {
1414: struct escape_filter_ctx *ret;
1415:
1.255 djm 1416: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1417: ret->escape_pending = 0;
1418: ret->escape_char = escape_char;
1419: return (void *)ret;
1420: }
1421:
1.198 djm 1422: /* Free the escape filter context on channel free */
1423: void
1424: client_filter_cleanup(int cid, void *ctx)
1425: {
1.250 djm 1426: free(ctx);
1.198 djm 1427: }
1428:
1.195 djm 1429: int
1430: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1431: {
1.190 djm 1432: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1433: return 0;
1434:
1.195 djm 1435: return process_escapes(c, &c->input, &c->output, &c->extended,
1436: buf, len);
1.30 markus 1437: }
1438:
1.77 itojun 1439: static void
1.60 markus 1440: client_channel_closed(int id, void *arg)
1441: {
1.83 markus 1442: channel_cancel_cleanup(id);
1.60 markus 1443: session_closed = 1;
1.233 djm 1444: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1445: }
1446:
1.15 markus 1447: /*
1.13 markus 1448: * Implements the interactive session with the server. This is called after
1449: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1450: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1451: * used as an escape character for terminating or suspending the session.
1.13 markus 1452: */
1.1 deraadt 1453:
1.20 markus 1454: int
1.30 markus 1455: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1456: {
1.46 markus 1457: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1458: double start_time, total_time;
1.265 markus 1459: int r, max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1.200 markus 1460: u_int64_t ibytes, obytes;
1.130 avsm 1461: u_int nalloc = 0;
1.11 markus 1462: char buf[100];
1463:
1464: debug("Entering interactive session.");
1465:
1466: start_time = get_current_time();
1467:
1468: /* Initialize variables. */
1.195 djm 1469: escape_pending1 = 0;
1.11 markus 1470: last_was_cr = 1;
1471: exit_status = -1;
1472: stdin_eof = 0;
1473: buffer_high = 64 * 1024;
1474: connection_in = packet_get_connection_in();
1475: connection_out = packet_get_connection_out();
1.46 markus 1476: max_fd = MAX(connection_in, connection_out);
1477:
1478: if (!compat20) {
1.63 markus 1479: /* enable nonblocking unless tty */
1480: if (!isatty(fileno(stdin)))
1481: set_nonblock(fileno(stdin));
1482: if (!isatty(fileno(stdout)))
1483: set_nonblock(fileno(stdout));
1484: if (!isatty(fileno(stderr)))
1485: set_nonblock(fileno(stderr));
1.46 markus 1486: max_fd = MAX(max_fd, fileno(stdin));
1487: max_fd = MAX(max_fd, fileno(stdout));
1488: max_fd = MAX(max_fd, fileno(stderr));
1489: }
1.11 markus 1490: quit_pending = 0;
1.195 djm 1491: escape_char1 = escape_char_arg;
1.11 markus 1492:
1493: /* Initialize buffers. */
1494: buffer_init(&stdin_buffer);
1495: buffer_init(&stdout_buffer);
1496: buffer_init(&stderr_buffer);
1497:
1.15 markus 1498: client_init_dispatch();
1499:
1.105 markus 1500: /*
1501: * Set signal handlers, (e.g. to restore non-blocking mode)
1502: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1503: */
1.131 djm 1504: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1505: signal(SIGHUP, signal_handler);
1.105 markus 1506: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1507: signal(SIGINT, signal_handler);
1508: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1509: signal(SIGQUIT, signal_handler);
1510: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1511: signal(SIGTERM, signal_handler);
1.132 djm 1512: signal(SIGWINCH, window_change_handler);
1.11 markus 1513:
1514: if (have_pty)
1.233 djm 1515: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1516:
1.48 markus 1517: if (compat20) {
1518: session_ident = ssh2_chan_id;
1.232 djm 1519: if (session_ident != -1) {
1520: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1521: channel_register_filter(session_ident,
1522: client_simple_escape_filter, NULL,
1523: client_filter_cleanup,
1524: client_new_escape_filter_ctx(
1525: escape_char_arg));
1526: }
1.60 markus 1527: channel_register_cleanup(session_ident,
1.143 djm 1528: client_channel_closed, 0);
1.232 djm 1529: }
1.48 markus 1530: } else {
1531: /* Check if we should immediately send eof on stdin. */
1.16 markus 1532: client_check_initial_eof_on_stdin();
1.48 markus 1533: }
1.30 markus 1534:
1.11 markus 1535: /* Main loop of the client for the interactive session mode. */
1536: while (!quit_pending) {
1537:
1.13 markus 1538: /* Process buffered packets sent by the server. */
1.11 markus 1539: client_process_buffered_input_packets();
1540:
1.60 markus 1541: if (compat20 && session_closed && !channel_still_open())
1542: break;
1543:
1.263 markus 1544: rekeying = (active_state->kex != NULL && !active_state->kex->done);
1.16 markus 1545:
1.56 markus 1546: if (rekeying) {
1547: debug("rekeying in progress");
1548: } else {
1549: /*
1550: * Make packets of buffered stdin data, and buffer
1551: * them for sending to the server.
1552: */
1553: if (!compat20)
1554: client_make_packets_from_stdin_data();
1.11 markus 1555:
1.56 markus 1556: /*
1557: * Make packets from buffered channel data, and
1558: * enqueue them for sending to the server.
1559: */
1560: if (packet_not_very_much_data_to_write())
1561: channel_output_poll();
1.11 markus 1562:
1.56 markus 1563: /*
1564: * Check if the window size has changed, and buffer a
1565: * message about it to the server if so.
1566: */
1567: client_check_window_change();
1.11 markus 1568:
1.56 markus 1569: if (quit_pending)
1570: break;
1571: }
1.13 markus 1572: /*
1573: * Wait until we have something to do (something becomes
1574: * available on one of the descriptors).
1575: */
1.81 markus 1576: max_fd2 = max_fd;
1.56 markus 1577: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1578: &max_fd2, &nalloc, rekeying);
1.11 markus 1579:
1580: if (quit_pending)
1581: break;
1582:
1.56 markus 1583: /* Do channel operations unless rekeying in progress. */
1584: if (!rekeying) {
1585: channel_after_select(readset, writeset);
1.108 markus 1586: if (need_rekeying || packet_need_rekeying()) {
1587: debug("need rekeying");
1.263 markus 1588: active_state->kex->done = 0;
1.265 markus 1589: if ((r = kex_send_kexinit(active_state)) != 0)
1590: fatal("%s: kex_send_kexinit: %s",
1591: __func__, ssh_err(r));
1.56 markus 1592: need_rekeying = 0;
1593: }
1594: }
1.11 markus 1595:
1.17 markus 1596: /* Buffer input from the connection. */
1.46 markus 1597: client_process_net_input(readset);
1.17 markus 1598:
1599: if (quit_pending)
1600: break;
1.11 markus 1601:
1.17 markus 1602: if (!compat20) {
1603: /* Buffer data from stdin */
1.46 markus 1604: client_process_input(readset);
1.17 markus 1605: /*
1606: * Process output to stdout and stderr. Output to
1607: * the connection is processed elsewhere (above).
1608: */
1.46 markus 1609: client_process_output(writeset);
1.214 andreas 1610: }
1611:
1612: if (session_resumed) {
1613: connection_in = packet_get_connection_in();
1614: connection_out = packet_get_connection_out();
1615: max_fd = MAX(max_fd, connection_out);
1616: max_fd = MAX(max_fd, connection_in);
1617: session_resumed = 0;
1.17 markus 1618: }
1.11 markus 1619:
1.197 djm 1620: /*
1621: * Send as much buffered packet data as possible to the
1622: * sender.
1623: */
1.46 markus 1624: if (FD_ISSET(connection_out, writeset))
1.11 markus 1625: packet_write_poll();
1.222 djm 1626:
1627: /*
1628: * If we are a backgrounded control master, and the
1629: * timeout has expired without any active client
1630: * connections, then quit.
1631: */
1632: if (control_persist_exit_time > 0) {
1.251 dtucker 1633: if (monotime() >= control_persist_exit_time) {
1.222 djm 1634: debug("ControlPersist timeout expired");
1635: break;
1636: }
1637: }
1.11 markus 1638: }
1.250 djm 1639: free(readset);
1640: free(writeset);
1.11 markus 1641:
1642: /* Terminate the session. */
1643:
1644: /* Stop watching for window change. */
1.132 djm 1645: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1646:
1.213 stevesk 1647: if (compat20) {
1648: packet_start(SSH2_MSG_DISCONNECT);
1649: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1650: packet_put_cstring("disconnected by user");
1.219 djm 1651: packet_put_cstring(""); /* language tag */
1.213 stevesk 1652: packet_send();
1653: packet_write_wait();
1654: }
1.11 markus 1655:
1.76 markus 1656: channel_free_all();
1.11 markus 1657:
1.75 markus 1658: if (have_pty)
1.233 djm 1659: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1660:
1661: /* restore blocking io */
1662: if (!isatty(fileno(stdin)))
1663: unset_nonblock(fileno(stdin));
1664: if (!isatty(fileno(stdout)))
1665: unset_nonblock(fileno(stdout));
1666: if (!isatty(fileno(stderr)))
1667: unset_nonblock(fileno(stderr));
1.116 dtucker 1668:
1669: /*
1670: * If there was no shell or command requested, there will be no remote
1671: * exit status to be returned. In that case, clear error code if the
1672: * connection was deliberately terminated at this end.
1673: */
1674: if (no_shell_flag && received_signal == SIGTERM) {
1675: received_signal = 0;
1676: exit_status = 0;
1677: }
1.75 markus 1678:
1.113 markus 1679: if (received_signal)
1.89 itojun 1680: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1681:
1.13 markus 1682: /*
1683: * In interactive mode (with pseudo tty) display a message indicating
1684: * that the connection has been closed.
1685: */
1.11 markus 1686: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1687: snprintf(buf, sizeof buf,
1688: "Connection to %.64s closed.\r\n", host);
1.11 markus 1689: buffer_append(&stderr_buffer, buf, strlen(buf));
1690: }
1.70 markus 1691:
1.11 markus 1692: /* Output any buffered data for stdout. */
1.231 djm 1693: if (buffer_len(&stdout_buffer) > 0) {
1.230 djm 1694: len = atomicio(vwrite, fileno(stdout),
1695: buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer));
1.231 djm 1696: if (len < 0 || (u_int)len != buffer_len(&stdout_buffer))
1.11 markus 1697: error("Write failed flushing stdout buffer.");
1.231 djm 1698: else
1699: buffer_consume(&stdout_buffer, len);
1.11 markus 1700: }
1701:
1702: /* Output any buffered data for stderr. */
1.231 djm 1703: if (buffer_len(&stderr_buffer) > 0) {
1.230 djm 1704: len = atomicio(vwrite, fileno(stderr),
1705: buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1.231 djm 1706: if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1.11 markus 1707: error("Write failed flushing stderr buffer.");
1.231 djm 1708: else
1709: buffer_consume(&stderr_buffer, len);
1.11 markus 1710: }
1711:
1712: /* Clear and free any buffers. */
1713: memset(buf, 0, sizeof(buf));
1714: buffer_free(&stdin_buffer);
1715: buffer_free(&stdout_buffer);
1716: buffer_free(&stderr_buffer);
1717:
1718: /* Report bytes transferred, and transfer rates. */
1719: total_time = get_current_time() - start_time;
1.263 markus 1720: packet_get_bytes(&ibytes, &obytes);
1.200 markus 1721: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1722: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1723: if (total_time > 0)
1.200 markus 1724: verbose("Bytes per second: sent %.1f, received %.1f",
1725: obytes / total_time, ibytes / total_time);
1.11 markus 1726: /* Return the exit status of the program. */
1727: debug("Exit status %d", exit_status);
1728: return exit_status;
1.15 markus 1729: }
1730:
1731: /*********/
1732:
1.264 markus 1733: static int
1.94 markus 1734: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1735: {
1.42 markus 1736: u_int data_len;
1.15 markus 1737: char *data = packet_get_string(&data_len);
1.93 markus 1738: packet_check_eom();
1.15 markus 1739: buffer_append(&stdout_buffer, data, data_len);
1.258 djm 1740: explicit_bzero(data, data_len);
1.250 djm 1741: free(data);
1.264 markus 1742: return 0;
1.15 markus 1743: }
1.264 markus 1744: static int
1.94 markus 1745: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1746: {
1.42 markus 1747: u_int data_len;
1.15 markus 1748: char *data = packet_get_string(&data_len);
1.93 markus 1749: packet_check_eom();
1.15 markus 1750: buffer_append(&stderr_buffer, data, data_len);
1.258 djm 1751: explicit_bzero(data, data_len);
1.250 djm 1752: free(data);
1.264 markus 1753: return 0;
1.15 markus 1754: }
1.264 markus 1755: static int
1.94 markus 1756: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1757: {
1758: exit_status = packet_get_int();
1.93 markus 1759: packet_check_eom();
1.15 markus 1760: /* Acknowledge the exit. */
1761: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1762: packet_send();
1763: /*
1764: * Must wait for packet to be sent since we are
1765: * exiting the loop.
1766: */
1767: packet_write_wait();
1768: /* Flag that we want to exit. */
1769: quit_pending = 1;
1.264 markus 1770: return 0;
1.15 markus 1771: }
1.264 markus 1772: static int
1.115 markus 1773: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1774: {
1775: Channel *c = NULL;
1.262 djm 1776: int r, remote_id, sock;
1.115 markus 1777:
1778: /* Read the remote channel number from the message. */
1779: remote_id = packet_get_int();
1780: packet_check_eom();
1781:
1782: /*
1783: * Get a connection to the local authentication agent (this may again
1784: * get forwarded).
1785: */
1.262 djm 1786: if ((r = ssh_get_authentication_socket(&sock)) != 0 &&
1787: r != SSH_ERR_AGENT_NOT_PRESENT)
1788: debug("%s: ssh_get_authentication_socket: %s",
1789: __func__, ssh_err(r));
1790:
1.115 markus 1791:
1792: /*
1793: * If we could not connect the agent, send an error message back to
1794: * the server. This should never happen unless the agent dies,
1795: * because authentication forwarding is only enabled if we have an
1796: * agent.
1797: */
1798: if (sock >= 0) {
1799: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1800: -1, 0, 0, 0, "authentication agent connection", 1);
1801: c->remote_id = remote_id;
1802: c->force_drain = 1;
1803: }
1804: if (c == NULL) {
1805: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1806: packet_put_int(remote_id);
1807: } else {
1808: /* Send a confirmation to the remote host. */
1809: debug("Forwarding authentication connection.");
1810: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1811: packet_put_int(remote_id);
1812: packet_put_int(c->self);
1813: }
1814: packet_send();
1.264 markus 1815: return 0;
1.115 markus 1816: }
1.15 markus 1817:
1.77 itojun 1818: static Channel *
1.40 markus 1819: client_request_forwarded_tcpip(const char *request_type, int rchan)
1820: {
1.103 deraadt 1821: Channel *c = NULL;
1.40 markus 1822: char *listen_address, *originator_address;
1.208 djm 1823: u_short listen_port, originator_port;
1.40 markus 1824:
1825: /* Get rest of the packet */
1826: listen_address = packet_get_string(NULL);
1827: listen_port = packet_get_int();
1828: originator_address = packet_get_string(NULL);
1829: originator_port = packet_get_int();
1.93 markus 1830: packet_check_eom();
1.40 markus 1831:
1.261 millert 1832: debug("%s: listen %s port %d, originator %s port %d", __func__,
1833: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1834:
1.260 markus 1835: c = channel_connect_by_listen_address(listen_address, listen_port,
1.191 djm 1836: "forwarded-tcpip", originator_address);
1.40 markus 1837:
1.250 djm 1838: free(originator_address);
1839: free(listen_address);
1.40 markus 1840: return c;
1841: }
1842:
1.103 deraadt 1843: static Channel *
1.261 millert 1844: client_request_forwarded_streamlocal(const char *request_type, int rchan)
1845: {
1846: Channel *c = NULL;
1847: char *listen_path;
1848:
1849: /* Get the remote path. */
1850: listen_path = packet_get_string(NULL);
1851: /* XXX: Skip reserved field for now. */
1852: if (packet_get_string_ptr(NULL) == NULL)
1853: fatal("%s: packet_get_string_ptr failed", __func__);
1854: packet_check_eom();
1855:
1856: debug("%s: %s", __func__, listen_path);
1857:
1858: c = channel_connect_by_listen_path(listen_path,
1859: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1860: free(listen_path);
1861: return c;
1862: }
1863:
1864: static Channel *
1.40 markus 1865: client_request_x11(const char *request_type, int rchan)
1866: {
1867: Channel *c = NULL;
1868: char *originator;
1.208 djm 1869: u_short originator_port;
1.67 markus 1870: int sock;
1.40 markus 1871:
1872: if (!options.forward_x11) {
1873: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1874: error("Warning: this is probably a break-in attempt by a "
1875: "malicious server.");
1.221 djm 1876: return NULL;
1877: }
1.251 dtucker 1878: if (x11_refuse_time != 0 && monotime() >= x11_refuse_time) {
1.221 djm 1879: verbose("Rejected X11 connection after ForwardX11Timeout "
1880: "expired");
1.40 markus 1881: return NULL;
1882: }
1883: originator = packet_get_string(NULL);
1884: if (datafellows & SSH_BUG_X11FWD) {
1885: debug2("buggy server: x11 request w/o originator_port");
1886: originator_port = 0;
1887: } else {
1888: originator_port = packet_get_int();
1889: }
1.93 markus 1890: packet_check_eom();
1.40 markus 1891: /* XXX check permission */
1.47 markus 1892: debug("client_request_x11: request from %s %d", originator,
1893: originator_port);
1.250 djm 1894: free(originator);
1.40 markus 1895: sock = x11_connect_display();
1.67 markus 1896: if (sock < 0)
1897: return NULL;
1898: c = channel_new("x11",
1899: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1900: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1901: c->force_drain = 1;
1.40 markus 1902: return c;
1903: }
1904:
1.103 deraadt 1905: static Channel *
1.40 markus 1906: client_request_agent(const char *request_type, int rchan)
1907: {
1908: Channel *c = NULL;
1.262 djm 1909: int r, sock;
1.40 markus 1910:
1911: if (!options.forward_agent) {
1912: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1913: error("Warning: this is probably a break-in attempt by a "
1914: "malicious server.");
1.40 markus 1915: return NULL;
1916: }
1.262 djm 1917: if ((r = ssh_get_authentication_socket(&sock)) != 0) {
1918: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1919: debug("%s: ssh_get_authentication_socket: %s",
1920: __func__, ssh_err(r));
1.67 markus 1921: return NULL;
1.262 djm 1922: }
1.67 markus 1923: c = channel_new("authentication agent connection",
1924: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1925: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1926: "authentication agent connection", 1);
1.82 markus 1927: c->force_drain = 1;
1.40 markus 1928: return c;
1.180 djm 1929: }
1930:
1931: int
1932: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1933: {
1934: Channel *c;
1935: int fd;
1936:
1937: if (tun_mode == SSH_TUNMODE_NO)
1938: return 0;
1939:
1940: if (!compat20) {
1.207 stevesk 1941: error("Tunnel forwarding is not supported for protocol 1");
1.180 djm 1942: return -1;
1943: }
1944:
1945: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1946:
1947: /* Open local tunnel device */
1948: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1949: error("Tunnel device open failed.");
1950: return -1;
1951: }
1952:
1953: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1954: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1955: c->datagram = 1;
1956:
1957: packet_start(SSH2_MSG_CHANNEL_OPEN);
1958: packet_put_cstring("tun@openssh.com");
1959: packet_put_int(c->self);
1960: packet_put_int(c->local_window_max);
1961: packet_put_int(c->local_maxpacket);
1962: packet_put_int(tun_mode);
1963: packet_put_int(remote_tun);
1964: packet_send();
1965:
1966: return 0;
1.40 markus 1967: }
1968:
1.22 markus 1969: /* XXXX move to generic input handler */
1.264 markus 1970: static int
1.94 markus 1971: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1972: {
1973: Channel *c = NULL;
1974: char *ctype;
1975: int rchan;
1.102 markus 1976: u_int rmaxpack, rwindow, len;
1.22 markus 1977:
1978: ctype = packet_get_string(&len);
1979: rchan = packet_get_int();
1980: rwindow = packet_get_int();
1981: rmaxpack = packet_get_int();
1982:
1.24 markus 1983: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1984: ctype, rchan, rwindow, rmaxpack);
1985:
1.40 markus 1986: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1987: c = client_request_forwarded_tcpip(ctype, rchan);
1.261 millert 1988: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1989: c = client_request_forwarded_streamlocal(ctype, rchan);
1.40 markus 1990: } else if (strcmp(ctype, "x11") == 0) {
1991: c = client_request_x11(ctype, rchan);
1992: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1993: c = client_request_agent(ctype, rchan);
1.22 markus 1994: }
1995: /* XXX duplicate : */
1996: if (c != NULL) {
1997: debug("confirm %s", ctype);
1998: c->remote_id = rchan;
1999: c->remote_window = rwindow;
2000: c->remote_maxpacket = rmaxpack;
1.69 markus 2001: if (c->type != SSH_CHANNEL_CONNECTING) {
2002: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
2003: packet_put_int(c->remote_id);
2004: packet_put_int(c->self);
2005: packet_put_int(c->local_window);
2006: packet_put_int(c->local_maxpacket);
2007: packet_send();
2008: }
1.22 markus 2009: } else {
2010: debug("failure %s", ctype);
2011: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
2012: packet_put_int(rchan);
2013: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 2014: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 2015: packet_put_cstring("open failed");
1.66 markus 2016: packet_put_cstring("");
2017: }
1.22 markus 2018: packet_send();
2019: }
1.250 djm 2020: free(ctype);
1.264 markus 2021: return 0;
1.22 markus 2022: }
1.264 markus 2023: static int
1.94 markus 2024: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 2025: {
2026: Channel *c = NULL;
1.123 djm 2027: int exitval, id, reply, success = 0;
1.48 markus 2028: char *rtype;
2029:
2030: id = packet_get_int();
2031: rtype = packet_get_string(NULL);
2032: reply = packet_get_char();
2033:
2034: debug("client_input_channel_req: channel %d rtype %s reply %d",
2035: id, rtype, reply);
2036:
1.128 djm 2037: if (id == -1) {
2038: error("client_input_channel_req: request for channel -1");
2039: } else if ((c = channel_lookup(id)) == NULL) {
1.197 djm 2040: error("client_input_channel_req: channel %d: "
2041: "unknown channel", id);
1.193 markus 2042: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
2043: packet_check_eom();
2044: chan_rcvd_eow(c);
1.48 markus 2045: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 2046: exitval = packet_get_int();
1.217 djm 2047: if (c->ctl_chan != -1) {
2048: mux_exit_message(c, exitval);
1.215 djm 2049: success = 1;
2050: } else if (id == session_ident) {
2051: /* Record exit value of local session */
1.123 djm 2052: success = 1;
2053: exit_status = exitval;
1.215 djm 2054: } else {
1.218 djm 2055: /* Probably for a mux channel that has already closed */
2056: debug("%s: no sink for exit-status on channel %d",
2057: __func__, id);
1.123 djm 2058: }
1.93 markus 2059: packet_check_eom();
1.48 markus 2060: }
1.259 djm 2061: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.48 markus 2062: packet_start(success ?
2063: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 2064: packet_put_int(c->remote_id);
1.48 markus 2065: packet_send();
2066: }
1.250 djm 2067: free(rtype);
1.264 markus 2068: return 0;
1.48 markus 2069: }
1.264 markus 2070: static int
1.95 markus 2071: client_input_global_request(int type, u_int32_t seq, void *ctxt)
2072: {
2073: char *rtype;
2074: int want_reply;
2075: int success = 0;
2076:
2077: rtype = packet_get_string(NULL);
2078: want_reply = packet_get_char();
1.117 markus 2079: debug("client_input_global_request: rtype %s want_reply %d",
2080: rtype, want_reply);
1.95 markus 2081: if (want_reply) {
2082: packet_start(success ?
2083: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
2084: packet_send();
2085: packet_write_wait();
2086: }
1.250 djm 2087: free(rtype);
1.264 markus 2088: return 0;
1.95 markus 2089: }
1.22 markus 2090:
1.123 djm 2091: void
1.129 deraadt 2092: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 2093: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 2094: {
2095: int len;
1.132 djm 2096: Channel *c = NULL;
1.123 djm 2097:
2098: debug2("%s: id %d", __func__, id);
2099:
1.132 djm 2100: if ((c = channel_lookup(id)) == NULL)
2101: fatal("client_session2_setup: channel %d: unknown channel", id);
1.224 djm 2102:
2103: packet_set_interactive(want_tty,
2104: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2105:
1.123 djm 2106: if (want_tty) {
2107: struct winsize ws;
2108:
2109: /* Store window size in the packet. */
2110: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2111: memset(&ws, 0, sizeof(ws));
2112:
1.190 djm 2113: channel_request_start(id, "pty-req", 1);
1.234 djm 2114: client_expect_confirm(id, "PTY allocation", CONFIRM_TTY);
1.123 djm 2115: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 2116: packet_put_int((u_int)ws.ws_col);
2117: packet_put_int((u_int)ws.ws_row);
2118: packet_put_int((u_int)ws.ws_xpixel);
2119: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 2120: if (tiop == NULL)
2121: tiop = get_saved_tio();
2122: tty_make_modes(-1, tiop);
1.123 djm 2123: packet_send();
2124: /* XXX wait for reply */
1.132 djm 2125: c->client_tty = 1;
1.123 djm 2126: }
2127:
2128: /* Transfer any environment variables from client to server */
1.126 djm 2129: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2130: int i, j, matched;
2131: char *name, *val;
2132:
2133: debug("Sending environment.");
1.126 djm 2134: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2135: /* Split */
1.126 djm 2136: name = xstrdup(env[i]);
1.123 djm 2137: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2138: free(name);
1.123 djm 2139: continue;
2140: }
2141: *val++ = '\0';
2142:
2143: matched = 0;
2144: for (j = 0; j < options.num_send_env; j++) {
2145: if (match_pattern(name, options.send_env[j])) {
2146: matched = 1;
2147: break;
2148: }
2149: }
2150: if (!matched) {
2151: debug3("Ignored env %s", name);
1.250 djm 2152: free(name);
1.123 djm 2153: continue;
2154: }
2155:
2156: debug("Sending env %s = %s", name, val);
2157: channel_request_start(id, "env", 0);
2158: packet_put_cstring(name);
2159: packet_put_cstring(val);
2160: packet_send();
1.250 djm 2161: free(name);
1.123 djm 2162: }
2163: }
2164:
2165: len = buffer_len(cmd);
2166: if (len > 0) {
2167: if (len > 900)
2168: len = 900;
2169: if (want_subsystem) {
1.190 djm 2170: debug("Sending subsystem: %.*s",
2171: len, (u_char*)buffer_ptr(cmd));
2172: channel_request_start(id, "subsystem", 1);
1.234 djm 2173: client_expect_confirm(id, "subsystem", CONFIRM_CLOSE);
1.123 djm 2174: } else {
1.190 djm 2175: debug("Sending command: %.*s",
2176: len, (u_char*)buffer_ptr(cmd));
2177: channel_request_start(id, "exec", 1);
1.234 djm 2178: client_expect_confirm(id, "exec", CONFIRM_CLOSE);
1.123 djm 2179: }
2180: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2181: packet_send();
2182: } else {
1.190 djm 2183: channel_request_start(id, "shell", 1);
1.234 djm 2184: client_expect_confirm(id, "shell", CONFIRM_CLOSE);
1.123 djm 2185: packet_send();
2186: }
2187: }
2188:
1.77 itojun 2189: static void
1.49 itojun 2190: client_init_dispatch_20(void)
1.16 markus 2191: {
1.55 markus 2192: dispatch_init(&dispatch_protocol_error);
1.100 markus 2193:
1.16 markus 2194: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2195: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2196: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2197: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2198: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2199: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2200: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2201: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2202: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2203: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2204: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2205: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2206:
2207: /* rekeying */
2208: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2209:
2210: /* global request reply messages */
2211: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2212: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 2213: }
1.197 djm 2214:
1.77 itojun 2215: static void
1.49 itojun 2216: client_init_dispatch_13(void)
1.15 markus 2217: {
2218: dispatch_init(NULL);
2219: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2220: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2221: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2222: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2223: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2224: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2225: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2226: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2227: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2228:
2229: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2230: &client_input_agent_open : &deny_input_open);
1.39 markus 2231: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2232: &x11_input_open : &deny_input_open);
1.15 markus 2233: }
1.197 djm 2234:
1.77 itojun 2235: static void
1.49 itojun 2236: client_init_dispatch_15(void)
1.15 markus 2237: {
2238: client_init_dispatch_13();
2239: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2240: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2241: }
1.197 djm 2242:
1.79 stevesk 2243: static void
1.49 itojun 2244: client_init_dispatch(void)
1.15 markus 2245: {
1.16 markus 2246: if (compat20)
2247: client_init_dispatch_20();
2248: else if (compat13)
1.15 markus 2249: client_init_dispatch_13();
2250: else
2251: client_init_dispatch_15();
1.232 djm 2252: }
2253:
2254: void
2255: client_stop_mux(void)
2256: {
2257: if (options.control_path != NULL && muxserver_sock != -1)
2258: unlink(options.control_path);
2259: /*
1.247 dtucker 2260: * If we are in persist mode, or don't have a shell, signal that we
2261: * should close when all active channels are closed.
1.232 djm 2262: */
1.247 dtucker 2263: if (options.control_persist || no_shell_flag) {
1.232 djm 2264: session_closed = 1;
1.235 djm 2265: setproctitle("[stopped mux]");
2266: }
1.113 markus 2267: }
2268:
2269: /* client specific fatal cleanup */
2270: void
1.114 markus 2271: cleanup_exit(int i)
1.113 markus 2272: {
1.233 djm 2273: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2274: leave_non_blocking();
1.192 djm 2275: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2276: unlink(options.control_path);
1.223 djm 2277: ssh_kill_proxy_command();
1.114 markus 2278: _exit(i);
1.1 deraadt 2279: }
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