Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.284
1.284 ! djm 1: /* $OpenBSD: clientloop.c,v 1.283 2016/02/01 21:18:17 millert 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"
1.275 markus 95: #include "myproposal.h"
1.45 markus 96: #include "log.h"
1.261 millert 97: #include "misc.h"
1.45 markus 98: #include "readconf.h"
99: #include "clientloop.h"
1.147 djm 100: #include "sshconnect.h"
1.40 markus 101: #include "authfd.h"
1.45 markus 102: #include "atomicio.h"
1.118 deraadt 103: #include "sshpty.h"
1.123 djm 104: #include "match.h"
105: #include "msg.h"
1.262 djm 106: #include "ssherr.h"
1.267 djm 107: #include "hostfile.h"
1.39 markus 108:
109: /* import options */
110: extern Options options;
111:
1.1 deraadt 112: /* Flag indicating that stdin should be redirected from /dev/null. */
113: extern int stdin_null_flag;
114:
1.116 dtucker 115: /* Flag indicating that no shell has been requested */
116: extern int no_shell_flag;
117:
1.123 djm 118: /* Control socket */
1.217 djm 119: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 120:
1.13 markus 121: /*
122: * Name of the host we are connecting to. This is the name given on the
123: * command line, or the HostName specified for the user-supplied name in a
124: * configuration file.
125: */
1.1 deraadt 126: extern char *host;
127:
1.13 markus 128: /*
129: * Flag to indicate that we have received a window change signal which has
130: * not yet been processed. This will cause a message indicating the new
131: * window size to be sent to the server a little later. This is volatile
132: * because this is updated in a signal handler.
133: */
1.88 markus 134: static volatile sig_atomic_t received_window_change_signal = 0;
135: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 136:
1.145 djm 137: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 138: static int in_non_blocking_mode = 0;
139:
1.222 djm 140: /* Time when backgrounded control master using ControlPersist should exit */
141: static time_t control_persist_exit_time = 0;
142:
1.1 deraadt 143: /* Common data for the client loop code. */
1.217 djm 144: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.195 djm 145: static int escape_char1; /* Escape character. (proto1 only) */
146: static int escape_pending1; /* Last character was an escape (proto1 only) */
1.11 markus 147: static int last_was_cr; /* Last character was a newline. */
1.197 djm 148: static int exit_status; /* Used to store the command exit status. */
149: static int stdin_eof; /* EOF has been encountered on stderr. */
1.11 markus 150: static Buffer stdin_buffer; /* Buffer for stdin data. */
151: static Buffer stdout_buffer; /* Buffer for stdout data. */
152: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.221 djm 153: static u_int buffer_high; /* Soft max buffer size. */
1.11 markus 154: static int connection_in; /* Connection to server (input). */
155: static int connection_out; /* Connection to server (output). */
1.56 markus 156: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 157: static int session_closed; /* In SSH2: login session closed. */
1.274 djm 158: static u_int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.1 deraadt 159:
1.77 itojun 160: static void client_init_dispatch(void);
1.16 markus 161: int session_ident = -1;
162:
1.195 djm 163: /* Track escape per proto2 channel */
164: struct escape_filter_ctx {
165: int escape_pending;
166: int escape_char;
167: };
168:
169: /* Context for channel confirmation replies */
1.190 djm 170: struct channel_reply_ctx {
171: const char *request_type;
1.234 djm 172: int id;
173: enum confirm_action action;
1.190 djm 174: };
175:
1.196 djm 176: /* Global request success/failure callbacks */
177: struct global_confirm {
178: TAILQ_ENTRY(global_confirm) entry;
179: global_confirm_cb *cb;
180: void *ctx;
181: int ref_count;
182: };
183: TAILQ_HEAD(global_confirms, global_confirm);
184: static struct global_confirms global_confirms =
185: TAILQ_HEAD_INITIALIZER(global_confirms);
186:
1.123 djm 187: void ssh_process_session2_setup(int, int, int, Buffer *);
188:
1.1 deraadt 189: /* Restores stdin to blocking mode. */
190:
1.77 itojun 191: static void
1.49 itojun 192: leave_non_blocking(void)
1.1 deraadt 193: {
1.11 markus 194: if (in_non_blocking_mode) {
1.125 djm 195: unset_nonblock(fileno(stdin));
1.11 markus 196: in_non_blocking_mode = 0;
197: }
1.1 deraadt 198: }
199:
1.11 markus 200: /* Puts stdin terminal in non-blocking mode. */
201:
1.77 itojun 202: static void
1.49 itojun 203: enter_non_blocking(void)
1.1 deraadt 204: {
1.11 markus 205: in_non_blocking_mode = 1;
1.124 djm 206: set_nonblock(fileno(stdin));
1.1 deraadt 207: }
208:
1.13 markus 209: /*
210: * Signal handler for the window change signal (SIGWINCH). This just sets a
211: * flag indicating that the window has changed.
212: */
1.157 deraadt 213: /*ARGSUSED */
1.77 itojun 214: static void
1.11 markus 215: window_change_handler(int sig)
1.1 deraadt 216: {
1.11 markus 217: received_window_change_signal = 1;
218: signal(SIGWINCH, window_change_handler);
1.1 deraadt 219: }
220:
1.13 markus 221: /*
222: * Signal handler for signals that cause the program to terminate. These
223: * signals must be trapped to restore terminal modes.
224: */
1.157 deraadt 225: /*ARGSUSED */
1.77 itojun 226: static void
1.11 markus 227: signal_handler(int sig)
1.1 deraadt 228: {
1.75 markus 229: received_signal = sig;
230: quit_pending = 1;
1.1 deraadt 231: }
232:
1.13 markus 233: /*
234: * Returns current time in seconds from Jan 1, 1970 with the maximum
235: * available resolution.
236: */
1.1 deraadt 237:
1.77 itojun 238: static double
1.49 itojun 239: get_current_time(void)
1.1 deraadt 240: {
1.11 markus 241: struct timeval tv;
242: gettimeofday(&tv, NULL);
243: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 244: }
245:
1.222 djm 246: /*
247: * Sets control_persist_exit_time to the absolute time when the
248: * backgrounded control master should exit due to expiry of the
249: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
250: * control master process, or if there is no ControlPersist timeout.
251: */
252: static void
253: set_control_persist_exit_time(void)
254: {
255: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 256: || options.control_persist_timeout == 0) {
1.222 djm 257: /* not using a ControlPersist timeout */
258: control_persist_exit_time = 0;
1.232 djm 259: } else if (channel_still_open()) {
1.222 djm 260: /* some client connections are still open */
261: if (control_persist_exit_time > 0)
262: debug2("%s: cancel scheduled exit", __func__);
263: control_persist_exit_time = 0;
264: } else if (control_persist_exit_time <= 0) {
265: /* a client connection has recently closed */
1.251 dtucker 266: control_persist_exit_time = monotime() +
1.222 djm 267: (time_t)options.control_persist_timeout;
268: debug2("%s: schedule exit in %d seconds", __func__,
269: options.control_persist_timeout);
270: }
271: /* else we are already counting down to the timeout */
272: }
273:
1.238 dtucker 274: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
275: static int
276: client_x11_display_valid(const char *display)
277: {
278: size_t i, dlen;
279:
1.279 djm 280: if (display == NULL)
281: return 0;
282:
1.238 dtucker 283: dlen = strlen(display);
284: for (i = 0; i < dlen; i++) {
1.256 deraadt 285: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 286: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
287: debug("Invalid character '%c' in DISPLAY", display[i]);
288: return 0;
289: }
290: }
291: return 1;
292: }
293:
1.274 djm 294: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
295: #define X11_TIMEOUT_SLACK 60
1.279 djm 296: int
1.138 djm 297: client_x11_get_proto(const char *display, const char *xauth_path,
1.221 djm 298: u_int trusted, u_int timeout, char **_proto, char **_data)
1.138 djm 299: {
1.279 djm 300: char cmd[1024], line[512], xdisplay[512];
301: char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
1.138 djm 302: static char proto[512], data[512];
303: FILE *f;
1.279 djm 304: int got_data = 0, generated = 0, do_unlink = 0, i, r;
1.138 djm 305: struct stat st;
1.274 djm 306: u_int now, x11_timeout_real;
1.138 djm 307:
308: *_proto = proto;
309: *_data = data;
1.279 djm 310: proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
1.138 djm 311:
1.279 djm 312: if (!client_x11_display_valid(display)) {
1.283 millert 313: if (display != NULL)
314: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
315: display);
1.279 djm 316: return -1;
317: }
318: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
1.138 djm 319: debug("No xauth program.");
1.279 djm 320: xauth_path = NULL;
321: }
322:
323: if (xauth_path != NULL) {
1.138 djm 324: /*
325: * Handle FamilyLocal case where $DISPLAY does
326: * not match an authorization entry. For this we
327: * just try "xauth list unix:displaynum.screennum".
328: * XXX: "localhost" match to determine FamilyLocal
329: * is not perfect.
330: */
331: if (strncmp(display, "localhost:", 10) == 0) {
1.279 djm 332: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
333: display + 10)) < 0 ||
334: (size_t)r >= sizeof(xdisplay)) {
335: error("%s: display name too long", __func__);
336: return -1;
337: }
1.138 djm 338: display = xdisplay;
339: }
340: if (trusted == 0) {
1.274 djm 341: /*
1.279 djm 342: * Generate an untrusted X11 auth cookie.
343: *
1.274 djm 344: * The authentication cookie should briefly outlive
345: * ssh's willingness to forward X11 connections to
346: * avoid nasty fail-open behaviour in the X server.
347: */
1.279 djm 348: mktemp_proto(xauthdir, sizeof(xauthdir));
349: if (mkdtemp(xauthdir) == NULL) {
350: error("%s: mkdtemp: %s",
351: __func__, strerror(errno));
352: return -1;
353: }
354: do_unlink = 1;
355: if ((r = snprintf(xauthfile, sizeof(xauthfile),
356: "%s/xauthfile", xauthdir)) < 0 ||
357: (size_t)r >= sizeof(xauthfile)) {
358: error("%s: xauthfile path too long", __func__);
359: unlink(xauthfile);
360: rmdir(xauthdir);
361: return -1;
362: }
363:
1.274 djm 364: if (timeout >= UINT_MAX - X11_TIMEOUT_SLACK)
365: x11_timeout_real = UINT_MAX;
366: else
367: x11_timeout_real = timeout + X11_TIMEOUT_SLACK;
1.279 djm 368: if ((r = snprintf(cmd, sizeof(cmd),
369: "%s -f %s generate %s " SSH_X11_PROTO
370: " untrusted timeout %u 2>" _PATH_DEVNULL,
371: xauth_path, xauthfile, display,
372: x11_timeout_real)) < 0 ||
373: (size_t)r >= sizeof(cmd))
374: fatal("%s: cmd too long", __func__);
375: debug2("%s: %s", __func__, cmd);
376: if (x11_refuse_time == 0) {
377: now = monotime() + 1;
378: if (UINT_MAX - timeout < now)
379: x11_refuse_time = UINT_MAX;
380: else
381: x11_refuse_time = now + timeout;
382: channel_set_x11_refuse_time(x11_refuse_time);
1.138 djm 383: }
1.279 djm 384: if (system(cmd) == 0)
385: generated = 1;
1.138 djm 386: }
1.181 markus 387:
388: /*
389: * When in untrusted mode, we read the cookie only if it was
390: * successfully generated as an untrusted one in the step
391: * above.
392: */
393: if (trusted || generated) {
394: snprintf(cmd, sizeof(cmd),
395: "%s %s%s list %s 2>" _PATH_DEVNULL,
396: xauth_path,
397: generated ? "-f " : "" ,
398: generated ? xauthfile : "",
399: display);
400: debug2("x11_get_proto: %s", cmd);
401: f = popen(cmd, "r");
402: if (f && fgets(line, sizeof(line), f) &&
403: sscanf(line, "%*s %511s %511s", proto, data) == 2)
404: got_data = 1;
405: if (f)
406: pclose(f);
1.279 djm 407: }
1.138 djm 408: }
409:
410: if (do_unlink) {
411: unlink(xauthfile);
412: rmdir(xauthdir);
413: }
414:
1.279 djm 415: /* Don't fall back to fake X11 data for untrusted forwarding */
416: if (!trusted && !got_data) {
417: error("Warning: untrusted X11 forwarding setup failed: "
418: "xauth key data not generated");
419: return -1;
420: }
421:
1.138 djm 422: /*
423: * If we didn't get authentication data, just make up some
424: * data. The forwarding code will check the validity of the
425: * response anyway, and substitute this data. The X11
426: * server, however, will ignore this fake data and use
427: * whatever authentication mechanisms it was using otherwise
428: * for the local connection.
429: */
430: if (!got_data) {
431: u_int32_t rnd = 0;
432:
433: logit("Warning: No xauth data; "
434: "using fake authentication data for X11 forwarding.");
435: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
436: for (i = 0; i < 16; i++) {
437: if (i % 4 == 0)
438: rnd = arc4random();
439: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
440: rnd & 0xff);
441: rnd >>= 8;
442: }
443: }
1.279 djm 444:
445: return 0;
1.1 deraadt 446: }
447:
1.13 markus 448: /*
449: * This is called when the interactive is entered. This checks if there is
450: * an EOF coming on stdin. We must check this explicitly, as select() does
451: * not appear to wake up when redirecting from /dev/null.
452: */
1.1 deraadt 453:
1.77 itojun 454: static void
1.49 itojun 455: client_check_initial_eof_on_stdin(void)
1.1 deraadt 456: {
1.11 markus 457: int len;
458: char buf[1];
1.1 deraadt 459:
1.13 markus 460: /*
461: * If standard input is to be "redirected from /dev/null", we simply
462: * mark that we have seen an EOF and send an EOF message to the
463: * server. Otherwise, we try to read a single character; it appears
464: * that for some files, such /dev/null, select() never wakes up for
465: * read for this descriptor, which means that we never get EOF. This
466: * way we will get the EOF if stdin comes from /dev/null or similar.
467: */
1.11 markus 468: if (stdin_null_flag) {
469: /* Fake EOF on stdin. */
470: debug("Sending eof.");
471: stdin_eof = 1;
472: packet_start(SSH_CMSG_EOF);
473: packet_send();
474: } else {
475: enter_non_blocking();
476:
477: /* Check for immediate EOF on stdin. */
478: len = read(fileno(stdin), buf, 1);
479: if (len == 0) {
1.197 djm 480: /*
481: * EOF. Record that we have seen it and send
482: * EOF to server.
483: */
1.11 markus 484: debug("Sending eof.");
485: stdin_eof = 1;
486: packet_start(SSH_CMSG_EOF);
487: packet_send();
488: } else if (len > 0) {
1.13 markus 489: /*
490: * Got data. We must store the data in the buffer,
491: * and also process it as an escape character if
492: * appropriate.
493: */
1.195 djm 494: if ((u_char) buf[0] == escape_char1)
495: escape_pending1 = 1;
1.52 markus 496: else
1.11 markus 497: buffer_append(&stdin_buffer, buf, 1);
498: }
499: leave_non_blocking();
500: }
1.1 deraadt 501: }
502:
503:
1.13 markus 504: /*
505: * Make packets from buffered stdin data, and buffer them for sending to the
506: * connection.
507: */
1.1 deraadt 508:
1.77 itojun 509: static void
1.49 itojun 510: client_make_packets_from_stdin_data(void)
1.1 deraadt 511: {
1.42 markus 512: u_int len;
1.1 deraadt 513:
1.11 markus 514: /* Send buffered stdin data to the server. */
515: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 516: packet_not_very_much_data_to_write()) {
1.11 markus 517: len = buffer_len(&stdin_buffer);
518: /* Keep the packets at reasonable size. */
519: if (len > packet_get_maxsize())
520: len = packet_get_maxsize();
521: packet_start(SSH_CMSG_STDIN_DATA);
522: packet_put_string(buffer_ptr(&stdin_buffer), len);
523: packet_send();
524: buffer_consume(&stdin_buffer, len);
525: /* If we have a pending EOF, send it now. */
526: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
527: packet_start(SSH_CMSG_EOF);
528: packet_send();
529: }
1.1 deraadt 530: }
531: }
532:
1.13 markus 533: /*
534: * Checks if the client window has changed, and sends a packet about it to
535: * the server if so. The actual change is detected elsewhere (by a software
536: * interrupt on Unix); this just checks the flag and sends a message if
537: * appropriate.
538: */
1.1 deraadt 539:
1.77 itojun 540: static void
1.49 itojun 541: client_check_window_change(void)
1.1 deraadt 542: {
1.16 markus 543: struct winsize ws;
544:
545: if (! received_window_change_signal)
546: return;
547: /** XXX race */
548: received_window_change_signal = 0;
549:
1.37 markus 550: debug2("client_check_window_change: changed");
1.16 markus 551:
552: if (compat20) {
1.123 djm 553: channel_send_window_changes();
1.16 markus 554: } else {
1.123 djm 555: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
556: return;
1.16 markus 557: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 558: packet_put_int((u_int)ws.ws_row);
559: packet_put_int((u_int)ws.ws_col);
560: packet_put_int((u_int)ws.ws_xpixel);
561: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 562: packet_send();
1.1 deraadt 563: }
564: }
565:
1.264 markus 566: static int
1.117 markus 567: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
568: {
1.196 djm 569: struct global_confirm *gc;
570:
571: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 572: return 0;
1.196 djm 573: if (gc->cb != NULL)
574: gc->cb(type, seq, gc->ctx);
575: if (--gc->ref_count <= 0) {
576: TAILQ_REMOVE(&global_confirms, gc, entry);
1.257 tedu 577: explicit_bzero(gc, sizeof(*gc));
1.250 djm 578: free(gc);
1.196 djm 579: }
580:
1.210 andreas 581: packet_set_alive_timeouts(0);
1.264 markus 582: return 0;
1.117 markus 583: }
584:
585: static void
586: server_alive_check(void)
587: {
1.210 andreas 588: if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
1.228 djm 589: logit("Timeout, server %s not responding.", host);
1.176 markus 590: cleanup_exit(255);
591: }
1.117 markus 592: packet_start(SSH2_MSG_GLOBAL_REQUEST);
593: packet_put_cstring("keepalive@openssh.com");
594: packet_put_char(1); /* boolean: want reply */
595: packet_send();
1.196 djm 596: /* Insert an empty placeholder to maintain ordering */
597: client_register_global_confirm(NULL, NULL);
1.117 markus 598: }
599:
1.13 markus 600: /*
601: * Waits until the client can do something (some data becomes available on
602: * one of the file descriptors).
603: */
1.77 itojun 604: static void
1.46 markus 605: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 606: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 607: {
1.117 markus 608: struct timeval tv, *tvp;
1.222 djm 609: int timeout_secs;
1.251 dtucker 610: time_t minwait_secs = 0, server_alive_time = 0, now = monotime();
1.117 markus 611: int ret;
612:
1.46 markus 613: /* Add any selections by the channel mechanism. */
1.239 djm 614: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp,
615: &minwait_secs, rekeying);
1.11 markus 616:
1.16 markus 617: if (!compat20) {
1.17 markus 618: /* Read from the connection, unless our buffers are full. */
1.16 markus 619: if (buffer_len(&stdout_buffer) < buffer_high &&
620: buffer_len(&stderr_buffer) < buffer_high &&
621: channel_not_very_much_buffered_data())
1.46 markus 622: FD_SET(connection_in, *readsetp);
1.17 markus 623: /*
624: * Read from stdin, unless we have seen EOF or have very much
625: * buffered data to send to the server.
626: */
627: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 628: FD_SET(fileno(stdin), *readsetp);
1.17 markus 629:
630: /* Select stdout/stderr if have data in buffer. */
631: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 632: FD_SET(fileno(stdout), *writesetp);
1.17 markus 633: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 634: FD_SET(fileno(stderr), *writesetp);
1.16 markus 635: } else {
1.71 markus 636: /* channel_prepare_select could have closed the last channel */
1.84 markus 637: if (session_closed && !channel_still_open() &&
638: !packet_have_data_to_write()) {
639: /* clear mask since we did not call select() */
1.87 markus 640: memset(*readsetp, 0, *nallocp);
641: memset(*writesetp, 0, *nallocp);
1.84 markus 642: return;
1.71 markus 643: } else {
644: FD_SET(connection_in, *readsetp);
645: }
1.16 markus 646: }
1.11 markus 647:
648: /* Select server connection if have data to write to the server. */
649: if (packet_have_data_to_write())
1.46 markus 650: FD_SET(connection_out, *writesetp);
1.11 markus 651:
1.13 markus 652: /*
653: * Wait for something to happen. This will suspend the process until
654: * some selected descriptor can be read, written, or has some other
1.222 djm 655: * event pending, or a timeout expires.
1.13 markus 656: */
1.11 markus 657:
1.222 djm 658: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.249 dtucker 659: if (options.server_alive_interval > 0 && compat20) {
1.222 djm 660: timeout_secs = options.server_alive_interval;
1.249 dtucker 661: server_alive_time = now + options.server_alive_interval;
662: }
663: if (options.rekey_interval > 0 && compat20 && !rekeying)
664: timeout_secs = MIN(timeout_secs, packet_get_rekey_timeout());
1.222 djm 665: set_control_persist_exit_time();
666: if (control_persist_exit_time > 0) {
667: timeout_secs = MIN(timeout_secs,
1.249 dtucker 668: control_persist_exit_time - now);
1.222 djm 669: if (timeout_secs < 0)
670: timeout_secs = 0;
671: }
1.239 djm 672: if (minwait_secs != 0)
673: timeout_secs = MIN(timeout_secs, (int)minwait_secs);
1.222 djm 674: if (timeout_secs == INT_MAX)
1.117 markus 675: tvp = NULL;
1.129 deraadt 676: else {
1.222 djm 677: tv.tv_sec = timeout_secs;
1.117 markus 678: tv.tv_usec = 0;
679: tvp = &tv;
680: }
1.222 djm 681:
1.117 markus 682: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
683: if (ret < 0) {
1.11 markus 684: char buf[100];
1.51 markus 685:
686: /*
687: * We have to clear the select masks, because we return.
688: * We have to return, because the mainloop checks for the flags
689: * set by the signal handlers.
690: */
1.87 markus 691: memset(*readsetp, 0, *nallocp);
692: memset(*writesetp, 0, *nallocp);
1.50 deraadt 693:
1.11 markus 694: if (errno == EINTR)
695: return;
696: /* Note: we might still have data in the buffers. */
697: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
698: buffer_append(&stderr_buffer, buf, strlen(buf));
699: quit_pending = 1;
1.249 dtucker 700: } else if (ret == 0) {
701: /*
702: * Timeout. Could have been either keepalive or rekeying.
703: * Keepalive we check here, rekeying is checked in clientloop.
704: */
1.251 dtucker 705: if (server_alive_time != 0 && server_alive_time <= monotime())
1.249 dtucker 706: server_alive_check();
707: }
708:
1.11 markus 709: }
710:
1.77 itojun 711: static void
1.31 markus 712: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 713: {
1.11 markus 714: /* Flush stdout and stderr buffers. */
1.31 markus 715: if (buffer_len(bout) > 0)
1.197 djm 716: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
717: buffer_len(bout));
1.31 markus 718: if (buffer_len(berr) > 0)
1.197 djm 719: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
720: buffer_len(berr));
1.11 markus 721:
1.233 djm 722: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 723:
1.13 markus 724: /*
725: * Free (and clear) the buffer to reduce the amount of data that gets
726: * written to swap.
727: */
1.31 markus 728: buffer_free(bin);
729: buffer_free(bout);
730: buffer_free(berr);
1.11 markus 731:
732: /* Send the suspend signal to the program itself. */
733: kill(getpid(), SIGTSTP);
734:
1.132 djm 735: /* Reset window sizes in case they have changed */
736: received_window_change_signal = 1;
1.11 markus 737:
738: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 739: buffer_init(bin);
740: buffer_init(bout);
741: buffer_init(berr);
1.11 markus 742:
1.233 djm 743: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 744: }
745:
1.77 itojun 746: static void
1.161 deraadt 747: client_process_net_input(fd_set *readset)
1.11 markus 748: {
1.280 markus 749: int len;
1.17 markus 750: char buf[8192];
1.11 markus 751:
1.13 markus 752: /*
753: * Read input from the server, and add any such data to the buffer of
754: * the packet subsystem.
755: */
1.11 markus 756: if (FD_ISSET(connection_in, readset)) {
757: /* Read as much as possible. */
1.280 markus 758: len = read(connection_in, buf, sizeof(buf));
759: if (len == 0) {
1.197 djm 760: /*
761: * Received EOF. The remote host has closed the
762: * connection.
763: */
764: snprintf(buf, sizeof buf,
765: "Connection to %.300s closed by remote host.\r\n",
766: host);
1.1 deraadt 767: buffer_append(&stderr_buffer, buf, strlen(buf));
768: quit_pending = 1;
769: return;
1.11 markus 770: }
1.13 markus 771: /*
772: * There is a kernel bug on Solaris that causes select to
773: * sometimes wake up even though there is no data available.
774: */
1.53 millert 775: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 776: len = 0;
777:
778: if (len < 0) {
1.197 djm 779: /*
780: * An error has encountered. Perhaps there is a
781: * network problem.
782: */
783: snprintf(buf, sizeof buf,
784: "Read from remote host %.300s: %.100s\r\n",
785: host, strerror(errno));
1.11 markus 786: buffer_append(&stderr_buffer, buf, strlen(buf));
787: quit_pending = 1;
788: return;
789: }
790: packet_process_incoming(buf, len);
791: }
1.17 markus 792: }
1.16 markus 793:
1.97 jakob 794: static void
1.190 djm 795: client_status_confirm(int type, Channel *c, void *ctx)
1.123 djm 796: {
1.190 djm 797: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
798: char errmsg[256];
799: int tochan;
800:
1.234 djm 801: /*
802: * If a TTY was explicitly requested, then a failure to allocate
803: * one is fatal.
804: */
805: if (cr->action == CONFIRM_TTY &&
806: (options.request_tty == REQUEST_TTY_FORCE ||
807: options.request_tty == REQUEST_TTY_YES))
808: cr->action = CONFIRM_CLOSE;
809:
1.190 djm 810: /* XXX supress on mux _client_ quietmode */
811: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 812: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 813:
814: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
815: debug2("%s request accepted on channel %d",
816: cr->request_type, c->self);
817: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
818: if (tochan) {
819: snprintf(errmsg, sizeof(errmsg),
820: "%s request failed\r\n", cr->request_type);
821: } else {
822: snprintf(errmsg, sizeof(errmsg),
823: "%s request failed on channel %d",
824: cr->request_type, c->self);
825: }
826: /* If error occurred on primary session channel, then exit */
1.234 djm 827: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 828: fatal("%s", errmsg);
1.234 djm 829: /*
830: * If error occurred on mux client, append to
831: * their stderr.
832: */
833: if (tochan) {
834: buffer_append(&c->extended, errmsg,
835: strlen(errmsg));
836: } else
1.190 djm 837: error("%s", errmsg);
1.234 djm 838: if (cr->action == CONFIRM_TTY) {
839: /*
840: * If a TTY allocation error occurred, then arrange
841: * for the correct TTY to leave raw mode.
842: */
843: if (c->self == session_ident)
844: leave_raw_mode(0);
845: else
846: mux_tty_alloc_failed(c);
847: } else if (cr->action == CONFIRM_CLOSE) {
1.190 djm 848: chan_read_failed(c);
849: chan_write_failed(c);
850: }
851: }
1.250 djm 852: free(cr);
1.190 djm 853: }
854:
855: static void
856: client_abandon_status_confirm(Channel *c, void *ctx)
857: {
1.250 djm 858: free(ctx);
1.190 djm 859: }
1.129 deraadt 860:
1.236 djm 861: void
1.234 djm 862: client_expect_confirm(int id, const char *request,
863: enum confirm_action action)
1.190 djm 864: {
1.255 djm 865: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 866:
1.190 djm 867: cr->request_type = request;
1.234 djm 868: cr->action = action;
1.123 djm 869:
1.190 djm 870: channel_register_status_confirm(id, client_status_confirm,
871: client_abandon_status_confirm, cr);
1.196 djm 872: }
873:
874: void
875: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
876: {
1.201 djm 877: struct global_confirm *gc, *last_gc;
1.196 djm 878:
879: /* Coalesce identical callbacks */
1.201 djm 880: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
881: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
882: if (++last_gc->ref_count >= INT_MAX)
883: fatal("%s: last_gc->ref_count = %d",
884: __func__, last_gc->ref_count);
1.196 djm 885: return;
886: }
887:
1.255 djm 888: gc = xcalloc(1, sizeof(*gc));
1.196 djm 889: gc->cb = cb;
890: gc->ctx = ctx;
891: gc->ref_count = 1;
892: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 893: }
894:
895: static void
1.99 markus 896: process_cmdline(void)
1.97 jakob 897: {
898: void (*handler)(int);
1.261 millert 899: char *s, *cmd;
900: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
901: struct Forward fwd;
1.97 jakob 902:
1.257 tedu 903: memset(&fwd, 0, sizeof(fwd));
1.183 djm 904:
1.233 djm 905: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 906: handler = signal(SIGINT, SIG_IGN);
1.99 markus 907: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 908: if (s == NULL)
909: goto out;
1.256 deraadt 910: while (isspace((u_char)*s))
1.97 jakob 911: s++;
1.121 djm 912: if (*s == '-')
913: s++; /* Skip cmdline '-', if any */
1.120 dtucker 914: if (*s == '\0')
1.97 jakob 915: goto out;
1.121 djm 916:
1.122 djm 917: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 918: logit("Commands:");
1.164 djm 919: logit(" -L[bind_address:]port:host:hostport "
920: "Request local forward");
921: logit(" -R[bind_address:]port:host:hostport "
922: "Request remote forward");
1.204 stevesk 923: logit(" -D[bind_address:]port "
924: "Request dynamic forward");
1.237 markus 925: logit(" -KL[bind_address:]port "
926: "Cancel local forward");
1.165 stevesk 927: logit(" -KR[bind_address:]port "
1.164 djm 928: "Cancel remote forward");
1.237 markus 929: logit(" -KD[bind_address:]port "
930: "Cancel dynamic forward");
1.146 reyk 931: if (!options.permit_local_command)
932: goto out;
1.164 djm 933: logit(" !args "
934: "Execute local command");
1.146 reyk 935: goto out;
936: }
937:
938: if (*s == '!' && options.permit_local_command) {
939: s++;
940: ssh_local_cmd(s);
1.121 djm 941: goto out;
942: }
943:
944: if (*s == 'K') {
945: delete = 1;
946: s++;
947: }
1.204 stevesk 948: if (*s == 'L')
949: local = 1;
950: else if (*s == 'R')
951: remote = 1;
952: else if (*s == 'D')
953: dynamic = 1;
954: else {
1.109 itojun 955: logit("Invalid command.");
1.97 jakob 956: goto out;
957: }
1.204 stevesk 958:
1.237 markus 959: if (delete && !compat20) {
1.109 itojun 960: logit("Not supported for SSH protocol version 1.");
1.97 jakob 961: goto out;
962: }
1.121 djm 963:
1.256 deraadt 964: while (isspace((u_char)*++s))
1.179 tedu 965: ;
1.97 jakob 966:
1.217 djm 967: /* XXX update list of forwards in options */
1.121 djm 968: if (delete) {
1.261 millert 969: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
970: if (!parse_forward(&fwd, s, 1, 0)) {
971: logit("Bad forwarding close specification.");
1.121 djm 972: goto out;
973: }
1.237 markus 974: if (remote)
1.261 millert 975: ok = channel_request_rforward_cancel(&fwd) == 0;
1.237 markus 976: else if (dynamic)
1.261 millert 977: ok = channel_cancel_lport_listener(&fwd,
978: 0, &options.fwd_opts) > 0;
1.237 markus 979: else
1.261 millert 980: ok = channel_cancel_lport_listener(&fwd,
981: CHANNEL_CANCEL_PORT_STATIC,
982: &options.fwd_opts) > 0;
1.237 markus 983: if (!ok) {
984: logit("Unkown port forwarding.");
985: goto out;
986: }
987: logit("Canceled forwarding.");
1.121 djm 988: } else {
1.209 djm 989: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 990: logit("Bad forwarding specification.");
991: goto out;
992: }
1.204 stevesk 993: if (local || dynamic) {
1.261 millert 994: if (!channel_setup_local_fwd_listener(&fwd,
995: &options.fwd_opts)) {
1.121 djm 996: logit("Port forwarding failed.");
997: goto out;
998: }
1.135 djm 999: } else {
1.261 millert 1000: if (channel_request_remote_forwarding(&fwd) < 0) {
1.167 markus 1001: logit("Port forwarding failed.");
1002: goto out;
1003: }
1.135 djm 1004: }
1.121 djm 1005: logit("Forwarding port.");
1006: }
1007:
1.97 jakob 1008: out:
1009: signal(SIGINT, handler);
1.233 djm 1010: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 1011: free(cmd);
1012: free(fwd.listen_host);
1.261 millert 1013: free(fwd.listen_path);
1.250 djm 1014: free(fwd.connect_host);
1.261 millert 1015: free(fwd.connect_path);
1.97 jakob 1016: }
1017:
1.244 dtucker 1018: /* reasons to suppress output of an escape command in help output */
1019: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1020: #define SUPPRESS_PROTO1 1 /* don't show in protocol 1 sessions */
1021: #define SUPPRESS_MUXCLIENT 2 /* don't show in mux client sessions */
1022: #define SUPPRESS_MUXMASTER 4 /* don't show in mux master sessions */
1023: #define SUPPRESS_SYSLOG 8 /* don't show when logging to syslog */
1024: struct escape_help_text {
1025: const char *cmd;
1026: const char *text;
1027: unsigned int flags;
1028: };
1029: static struct escape_help_text esc_txt[] = {
1030: {".", "terminate session", SUPPRESS_MUXMASTER},
1031: {".", "terminate connection (and any multiplexed sessions)",
1032: SUPPRESS_MUXCLIENT},
1033: {"B", "send a BREAK to the remote system", SUPPRESS_PROTO1},
1034: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1035: {"R", "request rekey", SUPPRESS_PROTO1},
1.246 dtucker 1036: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 1037: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
1038: {"#", "list forwarded connections", SUPPRESS_NEVER},
1039: {"&", "background ssh (when waiting for connections to terminate)",
1040: SUPPRESS_MUXCLIENT},
1041: {"?", "this message", SUPPRESS_NEVER},
1042: };
1043:
1044: static void
1045: print_escape_help(Buffer *b, int escape_char, int protocol2, int mux_client,
1046: int using_stderr)
1047: {
1048: unsigned int i, suppress_flags;
1049: char string[1024];
1050:
1051: snprintf(string, sizeof string, "%c?\r\n"
1052: "Supported escape sequences:\r\n", escape_char);
1053: buffer_append(b, string, strlen(string));
1054:
1055: suppress_flags = (protocol2 ? 0 : SUPPRESS_PROTO1) |
1056: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
1057: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
1058: (using_stderr ? 0 : SUPPRESS_SYSLOG);
1059:
1060: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
1061: if (esc_txt[i].flags & suppress_flags)
1062: continue;
1.246 dtucker 1063: snprintf(string, sizeof string, " %c%-3s - %s\r\n",
1.244 dtucker 1064: escape_char, esc_txt[i].cmd, esc_txt[i].text);
1065: buffer_append(b, string, strlen(string));
1066: }
1067:
1068: snprintf(string, sizeof string,
1.246 dtucker 1069: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 1070: "(Note that escapes are only recognized immediately after "
1071: "newline.)\r\n", escape_char, escape_char);
1072: buffer_append(b, string, strlen(string));
1073: }
1074:
1.195 djm 1075: /*
1076: * Process the characters one by one, call with c==NULL for proto1 case.
1077: */
1.77 itojun 1078: static int
1.195 djm 1079: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
1080: char *buf, int len)
1.31 markus 1081: {
1.32 markus 1082: char string[1024];
1.31 markus 1083: pid_t pid;
1084: int bytes = 0;
1.42 markus 1085: u_int i;
1086: u_char ch;
1.31 markus 1087: char *s;
1.195 djm 1088: int *escape_pendingp, escape_char;
1089: struct escape_filter_ctx *efc;
1.31 markus 1090:
1.195 djm 1091: if (c == NULL) {
1092: escape_pendingp = &escape_pending1;
1093: escape_char = escape_char1;
1094: } else {
1095: if (c->filter_ctx == NULL)
1096: return 0;
1097: efc = (struct escape_filter_ctx *)c->filter_ctx;
1098: escape_pendingp = &efc->escape_pending;
1099: escape_char = efc->escape_char;
1100: }
1101:
1.139 djm 1102: if (len <= 0)
1103: return (0);
1104:
1105: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1106: /* Get one character at a time. */
1107: ch = buf[i];
1108:
1.195 djm 1109: if (*escape_pendingp) {
1.31 markus 1110: /* We have previously seen an escape character. */
1111: /* Clear the flag now. */
1.195 djm 1112: *escape_pendingp = 0;
1.31 markus 1113:
1114: /* Process the escaped character. */
1115: switch (ch) {
1116: case '.':
1117: /* Terminate the connection. */
1.195 djm 1118: snprintf(string, sizeof string, "%c.\r\n",
1119: escape_char);
1.32 markus 1120: buffer_append(berr, string, strlen(string));
1.31 markus 1121:
1.217 djm 1122: if (c && c->ctl_chan != -1) {
1.195 djm 1123: chan_read_failed(c);
1124: chan_write_failed(c);
1.252 dtucker 1125: if (c->detach_user)
1126: c->detach_user(c->self, NULL);
1.253 dtucker 1127: c->type = SSH_CHANNEL_ABANDONED;
1128: buffer_clear(&c->input);
1129: chan_ibuf_empty(c);
1.195 djm 1130: return 0;
1131: } else
1132: quit_pending = 1;
1.31 markus 1133: return -1;
1134:
1135: case 'Z' - 64:
1.195 djm 1136: /* XXX support this for mux clients */
1.217 djm 1137: if (c && c->ctl_chan != -1) {
1.245 dtucker 1138: char b[16];
1.195 djm 1139: noescape:
1.245 dtucker 1140: if (ch == 'Z' - 64)
1141: snprintf(b, sizeof b, "^Z");
1142: else
1143: snprintf(b, sizeof b, "%c", ch);
1.195 djm 1144: snprintf(string, sizeof string,
1.245 dtucker 1145: "%c%s escape not available to "
1.195 djm 1146: "multiplexed sessions\r\n",
1.245 dtucker 1147: escape_char, b);
1.195 djm 1148: buffer_append(berr, string,
1149: strlen(string));
1150: continue;
1151: }
1.197 djm 1152: /* Suspend the program. Inform the user */
1.195 djm 1153: snprintf(string, sizeof string,
1154: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 1155: buffer_append(berr, string, strlen(string));
1.31 markus 1156:
1157: /* Restore terminal modes and suspend. */
1158: client_suspend_self(bin, bout, berr);
1159:
1160: /* We have been continued. */
1161: continue;
1162:
1.111 markus 1163: case 'B':
1164: if (compat20) {
1165: snprintf(string, sizeof string,
1166: "%cB\r\n", escape_char);
1167: buffer_append(berr, string,
1168: strlen(string));
1.254 djm 1169: channel_request_start(c->self,
1.111 markus 1170: "break", 0);
1171: packet_put_int(1000);
1172: packet_send();
1173: }
1174: continue;
1175:
1.54 markus 1176: case 'R':
1.59 markus 1177: if (compat20) {
1178: if (datafellows & SSH_BUG_NOREKEY)
1.197 djm 1179: logit("Server does not "
1180: "support re-keying");
1.59 markus 1181: else
1182: need_rekeying = 1;
1183: }
1.54 markus 1184: continue;
1185:
1.242 dtucker 1186: case 'V':
1187: /* FALLTHROUGH */
1188: case 'v':
1189: if (c && c->ctl_chan != -1)
1190: goto noescape;
1191: if (!log_is_on_stderr()) {
1192: snprintf(string, sizeof string,
1193: "%c%c [Logging to syslog]\r\n",
1194: escape_char, ch);
1195: buffer_append(berr, string,
1196: strlen(string));
1197: continue;
1198: }
1199: if (ch == 'V' && options.log_level >
1200: SYSLOG_LEVEL_QUIET)
1201: log_change_level(--options.log_level);
1202: if (ch == 'v' && options.log_level <
1203: SYSLOG_LEVEL_DEBUG3)
1204: log_change_level(++options.log_level);
1205: snprintf(string, sizeof string,
1206: "%c%c [LogLevel %s]\r\n", escape_char, ch,
1207: log_level_name(options.log_level));
1208: buffer_append(berr, string, strlen(string));
1209: continue;
1210:
1.31 markus 1211: case '&':
1.217 djm 1212: if (c && c->ctl_chan != -1)
1.195 djm 1213: goto noescape;
1.31 markus 1214: /*
1.197 djm 1215: * Detach the program (continue to serve
1216: * connections, but put in background and no
1217: * more new connections).
1.31 markus 1218: */
1219: /* Restore tty modes. */
1.233 djm 1220: leave_raw_mode(
1221: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1222:
1223: /* Stop listening for new connections. */
1.86 markus 1224: channel_stop_listening();
1.31 markus 1225:
1.86 markus 1226: snprintf(string, sizeof string,
1227: "%c& [backgrounded]\n", escape_char);
1228: buffer_append(berr, string, strlen(string));
1.31 markus 1229:
1230: /* Fork into background. */
1231: pid = fork();
1232: if (pid < 0) {
1233: error("fork: %.100s", strerror(errno));
1234: continue;
1235: }
1236: if (pid != 0) { /* This is the parent. */
1237: /* The parent just exits. */
1238: exit(0);
1239: }
1240: /* The child continues serving connections. */
1.86 markus 1241: if (compat20) {
1242: buffer_append(bin, "\004", 1);
1243: /* fake EOF on stdin */
1244: return -1;
1245: } else if (!stdin_eof) {
1246: /*
1.197 djm 1247: * Sending SSH_CMSG_EOF alone does not
1248: * always appear to be enough. So we
1249: * try to send an EOF character first.
1.86 markus 1250: */
1251: packet_start(SSH_CMSG_STDIN_DATA);
1252: packet_put_string("\004", 1);
1253: packet_send();
1254: /* Close stdin. */
1255: stdin_eof = 1;
1256: if (buffer_len(bin) == 0) {
1257: packet_start(SSH_CMSG_EOF);
1258: packet_send();
1259: }
1260: }
1261: continue;
1.31 markus 1262:
1263: case '?':
1.244 dtucker 1264: print_escape_help(berr, escape_char, compat20,
1265: (c && c->ctl_chan != -1),
1266: log_is_on_stderr());
1.31 markus 1267: continue;
1268:
1269: case '#':
1.195 djm 1270: snprintf(string, sizeof string, "%c#\r\n",
1271: escape_char);
1.32 markus 1272: buffer_append(berr, string, strlen(string));
1.31 markus 1273: s = channel_open_message();
1274: buffer_append(berr, s, strlen(s));
1.250 djm 1275: free(s);
1.97 jakob 1276: continue;
1277:
1278: case 'C':
1.217 djm 1279: if (c && c->ctl_chan != -1)
1.206 djm 1280: goto noescape;
1.99 markus 1281: process_cmdline();
1.31 markus 1282: continue;
1283:
1284: default:
1285: if (ch != escape_char) {
1286: buffer_put_char(bin, escape_char);
1287: bytes++;
1288: }
1289: /* Escaped characters fall through here */
1290: break;
1291: }
1292: } else {
1293: /*
1.197 djm 1294: * The previous character was not an escape char.
1295: * Check if this is an escape.
1.31 markus 1296: */
1297: if (last_was_cr && ch == escape_char) {
1.197 djm 1298: /*
1299: * It is. Set the flag and continue to
1300: * next character.
1301: */
1.195 djm 1302: *escape_pendingp = 1;
1.31 markus 1303: continue;
1304: }
1305: }
1306:
1307: /*
1308: * Normal character. Record whether it was a newline,
1309: * and append it to the buffer.
1310: */
1311: last_was_cr = (ch == '\r' || ch == '\n');
1312: buffer_put_char(bin, ch);
1313: bytes++;
1314: }
1315: return bytes;
1316: }
1317:
1.77 itojun 1318: static void
1.161 deraadt 1319: client_process_input(fd_set *readset)
1.17 markus 1320: {
1.21 deraadt 1321: int len;
1.31 markus 1322: char buf[8192];
1.16 markus 1323:
1.11 markus 1324: /* Read input from stdin. */
1325: if (FD_ISSET(fileno(stdin), readset)) {
1326: /* Read as much as possible. */
1327: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1328: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1329: return; /* we'll try again later */
1.11 markus 1330: if (len <= 0) {
1.13 markus 1331: /*
1332: * Received EOF or error. They are treated
1333: * similarly, except that an error message is printed
1334: * if it was an error condition.
1335: */
1.11 markus 1336: if (len < 0) {
1.197 djm 1337: snprintf(buf, sizeof buf, "read: %.100s\r\n",
1338: strerror(errno));
1.11 markus 1339: buffer_append(&stderr_buffer, buf, strlen(buf));
1340: }
1341: /* Mark that we have seen EOF. */
1342: stdin_eof = 1;
1.13 markus 1343: /*
1344: * Send an EOF message to the server unless there is
1345: * data in the buffer. If there is data in the
1346: * buffer, no message will be sent now. Code
1347: * elsewhere will send the EOF when the buffer
1348: * becomes empty if stdin_eof is set.
1349: */
1.11 markus 1350: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1351: packet_start(SSH_CMSG_EOF);
1352: packet_send();
1.11 markus 1353: }
1.195 djm 1354: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1355: /*
1356: * Normal successful read, and no escape character.
1357: * Just append the data to buffer.
1358: */
1.11 markus 1359: buffer_append(&stdin_buffer, buf, len);
1360: } else {
1.13 markus 1361: /*
1.197 djm 1362: * Normal, successful read. But we have an escape
1363: * character and have to process the characters one
1364: * by one.
1.13 markus 1365: */
1.195 djm 1366: if (process_escapes(NULL, &stdin_buffer,
1367: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1368: return;
1.11 markus 1369: }
1370: }
1371: }
1372:
1.77 itojun 1373: static void
1.161 deraadt 1374: client_process_output(fd_set *writeset)
1.11 markus 1375: {
1376: int len;
1377: char buf[100];
1.1 deraadt 1378:
1.11 markus 1379: /* Write buffered output to stdout. */
1380: if (FD_ISSET(fileno(stdout), writeset)) {
1381: /* Write as much data as possible. */
1382: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1383: buffer_len(&stdout_buffer));
1.11 markus 1384: if (len <= 0) {
1.64 markus 1385: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1386: len = 0;
1387: else {
1.13 markus 1388: /*
1389: * An error or EOF was encountered. Put an
1390: * error message to stderr buffer.
1391: */
1.197 djm 1392: snprintf(buf, sizeof buf,
1393: "write stdout: %.50s\r\n", strerror(errno));
1.11 markus 1394: buffer_append(&stderr_buffer, buf, strlen(buf));
1395: quit_pending = 1;
1396: return;
1397: }
1398: }
1399: /* Consume printed data from the buffer. */
1400: buffer_consume(&stdout_buffer, len);
1401: }
1402: /* Write buffered output to stderr. */
1403: if (FD_ISSET(fileno(stderr), writeset)) {
1404: /* Write as much data as possible. */
1405: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1406: buffer_len(&stderr_buffer));
1.11 markus 1407: if (len <= 0) {
1.64 markus 1408: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1409: len = 0;
1410: else {
1.197 djm 1411: /*
1412: * EOF or error, but can't even print
1413: * error message.
1414: */
1.11 markus 1415: quit_pending = 1;
1416: return;
1417: }
1418: }
1419: /* Consume printed characters from the buffer. */
1420: buffer_consume(&stderr_buffer, len);
1421: }
1.1 deraadt 1422: }
1423:
1.13 markus 1424: /*
1.15 markus 1425: * Get packets from the connection input buffer, and process them as long as
1426: * there are packets available.
1427: *
1428: * Any unknown packets received during the actual
1429: * session cause the session to terminate. This is
1430: * intended to make debugging easier since no
1431: * confirmations are sent. Any compatible protocol
1432: * extensions must be negotiated during the
1433: * preparatory phase.
1434: */
1435:
1.77 itojun 1436: static void
1.49 itojun 1437: client_process_buffered_input_packets(void)
1.15 markus 1438: {
1.265 markus 1439: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, active_state);
1.15 markus 1440: }
1441:
1.31 markus 1442: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1443:
1.195 djm 1444: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1445: void *
1446: client_new_escape_filter_ctx(int escape_char)
1447: {
1448: struct escape_filter_ctx *ret;
1449:
1.255 djm 1450: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1451: ret->escape_pending = 0;
1452: ret->escape_char = escape_char;
1453: return (void *)ret;
1454: }
1455:
1.198 djm 1456: /* Free the escape filter context on channel free */
1457: void
1458: client_filter_cleanup(int cid, void *ctx)
1459: {
1.250 djm 1460: free(ctx);
1.198 djm 1461: }
1462:
1.195 djm 1463: int
1464: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1465: {
1.190 djm 1466: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1467: return 0;
1468:
1.195 djm 1469: return process_escapes(c, &c->input, &c->output, &c->extended,
1470: buf, len);
1.30 markus 1471: }
1472:
1.77 itojun 1473: static void
1.60 markus 1474: client_channel_closed(int id, void *arg)
1475: {
1.83 markus 1476: channel_cancel_cleanup(id);
1.60 markus 1477: session_closed = 1;
1.233 djm 1478: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1479: }
1480:
1.15 markus 1481: /*
1.13 markus 1482: * Implements the interactive session with the server. This is called after
1483: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1484: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1485: * used as an escape character for terminating or suspending the session.
1.13 markus 1486: */
1.1 deraadt 1487:
1.20 markus 1488: int
1.30 markus 1489: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1490: {
1.46 markus 1491: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1492: double start_time, total_time;
1.284 ! djm 1493: int r, max_fd = 0, max_fd2 = 0, len;
1.200 markus 1494: u_int64_t ibytes, obytes;
1.130 avsm 1495: u_int nalloc = 0;
1.11 markus 1496: char buf[100];
1497:
1498: debug("Entering interactive session.");
1.277 semarie 1499:
1.278 semarie 1500: if (options.control_master &&
1501: ! option_clear_or_none(options.control_path)) {
1502: debug("pledge: id");
1503: if (pledge("stdio rpath wpath cpath unix inet dns proc exec id tty",
1504: NULL) == -1)
1505: fatal("%s pledge(): %s", __func__, strerror(errno));
1506:
1507: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1508: debug("pledge: exec");
1509: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1510: NULL) == -1)
1511: fatal("%s pledge(): %s", __func__, strerror(errno));
1512:
1513: } else if (options.update_hostkeys) {
1514: debug("pledge: filesystem full");
1515: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1516: NULL) == -1)
1517: fatal("%s pledge(): %s", __func__, strerror(errno));
1518:
1519: } else if (! option_clear_or_none(options.proxy_command)) {
1520: debug("pledge: proc");
1521: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1522: fatal("%s pledge(): %s", __func__, strerror(errno));
1523:
1524: } else {
1525: debug("pledge: network");
1526: if (pledge("stdio unix inet dns tty", NULL) == -1)
1527: fatal("%s pledge(): %s", __func__, strerror(errno));
1528: }
1.11 markus 1529:
1530: start_time = get_current_time();
1531:
1532: /* Initialize variables. */
1.195 djm 1533: escape_pending1 = 0;
1.11 markus 1534: last_was_cr = 1;
1535: exit_status = -1;
1536: stdin_eof = 0;
1537: buffer_high = 64 * 1024;
1538: connection_in = packet_get_connection_in();
1539: connection_out = packet_get_connection_out();
1.46 markus 1540: max_fd = MAX(connection_in, connection_out);
1541:
1542: if (!compat20) {
1.63 markus 1543: /* enable nonblocking unless tty */
1544: if (!isatty(fileno(stdin)))
1545: set_nonblock(fileno(stdin));
1546: if (!isatty(fileno(stdout)))
1547: set_nonblock(fileno(stdout));
1548: if (!isatty(fileno(stderr)))
1549: set_nonblock(fileno(stderr));
1.46 markus 1550: max_fd = MAX(max_fd, fileno(stdin));
1551: max_fd = MAX(max_fd, fileno(stdout));
1552: max_fd = MAX(max_fd, fileno(stderr));
1553: }
1.11 markus 1554: quit_pending = 0;
1.195 djm 1555: escape_char1 = escape_char_arg;
1.11 markus 1556:
1557: /* Initialize buffers. */
1558: buffer_init(&stdin_buffer);
1559: buffer_init(&stdout_buffer);
1560: buffer_init(&stderr_buffer);
1561:
1.15 markus 1562: client_init_dispatch();
1563:
1.105 markus 1564: /*
1565: * Set signal handlers, (e.g. to restore non-blocking mode)
1566: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1567: */
1.131 djm 1568: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1569: signal(SIGHUP, signal_handler);
1.105 markus 1570: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1571: signal(SIGINT, signal_handler);
1572: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1573: signal(SIGQUIT, signal_handler);
1574: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1575: signal(SIGTERM, signal_handler);
1.132 djm 1576: signal(SIGWINCH, window_change_handler);
1.11 markus 1577:
1578: if (have_pty)
1.233 djm 1579: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1580:
1.48 markus 1581: if (compat20) {
1582: session_ident = ssh2_chan_id;
1.232 djm 1583: if (session_ident != -1) {
1584: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1585: channel_register_filter(session_ident,
1586: client_simple_escape_filter, NULL,
1587: client_filter_cleanup,
1588: client_new_escape_filter_ctx(
1589: escape_char_arg));
1590: }
1.60 markus 1591: channel_register_cleanup(session_ident,
1.143 djm 1592: client_channel_closed, 0);
1.232 djm 1593: }
1.48 markus 1594: } else {
1595: /* Check if we should immediately send eof on stdin. */
1.16 markus 1596: client_check_initial_eof_on_stdin();
1.48 markus 1597: }
1.30 markus 1598:
1.11 markus 1599: /* Main loop of the client for the interactive session mode. */
1600: while (!quit_pending) {
1601:
1.13 markus 1602: /* Process buffered packets sent by the server. */
1.11 markus 1603: client_process_buffered_input_packets();
1604:
1.60 markus 1605: if (compat20 && session_closed && !channel_still_open())
1606: break;
1607:
1.284 ! djm 1608: if (ssh_packet_is_rekeying(active_state)) {
1.56 markus 1609: debug("rekeying in progress");
1.284 ! djm 1610: } else if (need_rekeying) {
! 1611: /* manual rekey request */
! 1612: debug("need rekeying");
! 1613: if ((r = kex_start_rekex(active_state)) != 0)
! 1614: fatal("%s: kex_start_rekex: %s", __func__,
! 1615: ssh_err(r));
! 1616: need_rekeying = 0;
1.56 markus 1617: } else {
1618: /*
1619: * Make packets of buffered stdin data, and buffer
1620: * them for sending to the server.
1621: */
1622: if (!compat20)
1623: client_make_packets_from_stdin_data();
1.11 markus 1624:
1.56 markus 1625: /*
1626: * Make packets from buffered channel data, and
1627: * enqueue them for sending to the server.
1628: */
1629: if (packet_not_very_much_data_to_write())
1630: channel_output_poll();
1.11 markus 1631:
1.56 markus 1632: /*
1633: * Check if the window size has changed, and buffer a
1634: * message about it to the server if so.
1635: */
1636: client_check_window_change();
1.11 markus 1637:
1.56 markus 1638: if (quit_pending)
1639: break;
1640: }
1.13 markus 1641: /*
1642: * Wait until we have something to do (something becomes
1643: * available on one of the descriptors).
1644: */
1.81 markus 1645: max_fd2 = max_fd;
1.56 markus 1646: client_wait_until_can_do_something(&readset, &writeset,
1.284 ! djm 1647: &max_fd2, &nalloc, ssh_packet_is_rekeying(active_state));
1.11 markus 1648:
1649: if (quit_pending)
1650: break;
1651:
1.56 markus 1652: /* Do channel operations unless rekeying in progress. */
1.284 ! djm 1653: if (!ssh_packet_is_rekeying(active_state))
1.56 markus 1654: channel_after_select(readset, writeset);
1.11 markus 1655:
1.17 markus 1656: /* Buffer input from the connection. */
1.46 markus 1657: client_process_net_input(readset);
1.17 markus 1658:
1659: if (quit_pending)
1660: break;
1.11 markus 1661:
1.17 markus 1662: if (!compat20) {
1663: /* Buffer data from stdin */
1.46 markus 1664: client_process_input(readset);
1.17 markus 1665: /*
1666: * Process output to stdout and stderr. Output to
1667: * the connection is processed elsewhere (above).
1668: */
1.46 markus 1669: client_process_output(writeset);
1.17 markus 1670: }
1.11 markus 1671:
1.197 djm 1672: /*
1673: * Send as much buffered packet data as possible to the
1674: * sender.
1675: */
1.46 markus 1676: if (FD_ISSET(connection_out, writeset))
1.11 markus 1677: packet_write_poll();
1.222 djm 1678:
1679: /*
1680: * If we are a backgrounded control master, and the
1681: * timeout has expired without any active client
1682: * connections, then quit.
1683: */
1684: if (control_persist_exit_time > 0) {
1.251 dtucker 1685: if (monotime() >= control_persist_exit_time) {
1.222 djm 1686: debug("ControlPersist timeout expired");
1687: break;
1688: }
1689: }
1.11 markus 1690: }
1.250 djm 1691: free(readset);
1692: free(writeset);
1.11 markus 1693:
1694: /* Terminate the session. */
1695:
1696: /* Stop watching for window change. */
1.132 djm 1697: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1698:
1.213 stevesk 1699: if (compat20) {
1700: packet_start(SSH2_MSG_DISCONNECT);
1701: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1702: packet_put_cstring("disconnected by user");
1.219 djm 1703: packet_put_cstring(""); /* language tag */
1.213 stevesk 1704: packet_send();
1705: packet_write_wait();
1706: }
1.11 markus 1707:
1.76 markus 1708: channel_free_all();
1.11 markus 1709:
1.75 markus 1710: if (have_pty)
1.233 djm 1711: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1712:
1713: /* restore blocking io */
1714: if (!isatty(fileno(stdin)))
1715: unset_nonblock(fileno(stdin));
1716: if (!isatty(fileno(stdout)))
1717: unset_nonblock(fileno(stdout));
1718: if (!isatty(fileno(stderr)))
1719: unset_nonblock(fileno(stderr));
1.116 dtucker 1720:
1721: /*
1722: * If there was no shell or command requested, there will be no remote
1723: * exit status to be returned. In that case, clear error code if the
1724: * connection was deliberately terminated at this end.
1725: */
1726: if (no_shell_flag && received_signal == SIGTERM) {
1727: received_signal = 0;
1728: exit_status = 0;
1729: }
1.75 markus 1730:
1.113 markus 1731: if (received_signal)
1.89 itojun 1732: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1733:
1.13 markus 1734: /*
1735: * In interactive mode (with pseudo tty) display a message indicating
1736: * that the connection has been closed.
1737: */
1.11 markus 1738: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1739: snprintf(buf, sizeof buf,
1740: "Connection to %.64s closed.\r\n", host);
1.11 markus 1741: buffer_append(&stderr_buffer, buf, strlen(buf));
1742: }
1.70 markus 1743:
1.11 markus 1744: /* Output any buffered data for stdout. */
1.231 djm 1745: if (buffer_len(&stdout_buffer) > 0) {
1.230 djm 1746: len = atomicio(vwrite, fileno(stdout),
1747: buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer));
1.231 djm 1748: if (len < 0 || (u_int)len != buffer_len(&stdout_buffer))
1.11 markus 1749: error("Write failed flushing stdout buffer.");
1.231 djm 1750: else
1751: buffer_consume(&stdout_buffer, len);
1.11 markus 1752: }
1753:
1754: /* Output any buffered data for stderr. */
1.231 djm 1755: if (buffer_len(&stderr_buffer) > 0) {
1.230 djm 1756: len = atomicio(vwrite, fileno(stderr),
1757: buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1.231 djm 1758: if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1.11 markus 1759: error("Write failed flushing stderr buffer.");
1.231 djm 1760: else
1761: buffer_consume(&stderr_buffer, len);
1.11 markus 1762: }
1763:
1764: /* Clear and free any buffers. */
1.281 jsg 1765: explicit_bzero(buf, sizeof(buf));
1.11 markus 1766: buffer_free(&stdin_buffer);
1767: buffer_free(&stdout_buffer);
1768: buffer_free(&stderr_buffer);
1769:
1770: /* Report bytes transferred, and transfer rates. */
1771: total_time = get_current_time() - start_time;
1.263 markus 1772: packet_get_bytes(&ibytes, &obytes);
1.200 markus 1773: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1774: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1775: if (total_time > 0)
1.200 markus 1776: verbose("Bytes per second: sent %.1f, received %.1f",
1777: obytes / total_time, ibytes / total_time);
1.11 markus 1778: /* Return the exit status of the program. */
1779: debug("Exit status %d", exit_status);
1780: return exit_status;
1.15 markus 1781: }
1782:
1783: /*********/
1784:
1.264 markus 1785: static int
1.94 markus 1786: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1787: {
1.42 markus 1788: u_int data_len;
1.15 markus 1789: char *data = packet_get_string(&data_len);
1.93 markus 1790: packet_check_eom();
1.15 markus 1791: buffer_append(&stdout_buffer, data, data_len);
1.258 djm 1792: explicit_bzero(data, data_len);
1.250 djm 1793: free(data);
1.264 markus 1794: return 0;
1.15 markus 1795: }
1.264 markus 1796: static int
1.94 markus 1797: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1798: {
1.42 markus 1799: u_int data_len;
1.15 markus 1800: char *data = packet_get_string(&data_len);
1.93 markus 1801: packet_check_eom();
1.15 markus 1802: buffer_append(&stderr_buffer, data, data_len);
1.258 djm 1803: explicit_bzero(data, data_len);
1.250 djm 1804: free(data);
1.264 markus 1805: return 0;
1.15 markus 1806: }
1.264 markus 1807: static int
1.94 markus 1808: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1809: {
1810: exit_status = packet_get_int();
1.93 markus 1811: packet_check_eom();
1.15 markus 1812: /* Acknowledge the exit. */
1813: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1814: packet_send();
1815: /*
1816: * Must wait for packet to be sent since we are
1817: * exiting the loop.
1818: */
1819: packet_write_wait();
1820: /* Flag that we want to exit. */
1821: quit_pending = 1;
1.264 markus 1822: return 0;
1.15 markus 1823: }
1.267 djm 1824:
1.264 markus 1825: static int
1.115 markus 1826: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1827: {
1828: Channel *c = NULL;
1.262 djm 1829: int r, remote_id, sock;
1.115 markus 1830:
1831: /* Read the remote channel number from the message. */
1832: remote_id = packet_get_int();
1833: packet_check_eom();
1834:
1835: /*
1836: * Get a connection to the local authentication agent (this may again
1837: * get forwarded).
1838: */
1.262 djm 1839: if ((r = ssh_get_authentication_socket(&sock)) != 0 &&
1840: r != SSH_ERR_AGENT_NOT_PRESENT)
1841: debug("%s: ssh_get_authentication_socket: %s",
1842: __func__, ssh_err(r));
1843:
1.115 markus 1844:
1845: /*
1846: * If we could not connect the agent, send an error message back to
1847: * the server. This should never happen unless the agent dies,
1848: * because authentication forwarding is only enabled if we have an
1849: * agent.
1850: */
1851: if (sock >= 0) {
1852: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1853: -1, 0, 0, 0, "authentication agent connection", 1);
1854: c->remote_id = remote_id;
1855: c->force_drain = 1;
1856: }
1857: if (c == NULL) {
1858: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1859: packet_put_int(remote_id);
1860: } else {
1861: /* Send a confirmation to the remote host. */
1862: debug("Forwarding authentication connection.");
1863: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1864: packet_put_int(remote_id);
1865: packet_put_int(c->self);
1866: }
1867: packet_send();
1.264 markus 1868: return 0;
1.115 markus 1869: }
1.15 markus 1870:
1.77 itojun 1871: static Channel *
1.40 markus 1872: client_request_forwarded_tcpip(const char *request_type, int rchan)
1873: {
1.103 deraadt 1874: Channel *c = NULL;
1.40 markus 1875: char *listen_address, *originator_address;
1.208 djm 1876: u_short listen_port, originator_port;
1.40 markus 1877:
1878: /* Get rest of the packet */
1879: listen_address = packet_get_string(NULL);
1880: listen_port = packet_get_int();
1881: originator_address = packet_get_string(NULL);
1882: originator_port = packet_get_int();
1.93 markus 1883: packet_check_eom();
1.40 markus 1884:
1.261 millert 1885: debug("%s: listen %s port %d, originator %s port %d", __func__,
1886: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1887:
1.260 markus 1888: c = channel_connect_by_listen_address(listen_address, listen_port,
1.191 djm 1889: "forwarded-tcpip", originator_address);
1.40 markus 1890:
1.250 djm 1891: free(originator_address);
1892: free(listen_address);
1.40 markus 1893: return c;
1894: }
1895:
1.103 deraadt 1896: static Channel *
1.261 millert 1897: client_request_forwarded_streamlocal(const char *request_type, int rchan)
1898: {
1899: Channel *c = NULL;
1900: char *listen_path;
1901:
1902: /* Get the remote path. */
1903: listen_path = packet_get_string(NULL);
1904: /* XXX: Skip reserved field for now. */
1905: if (packet_get_string_ptr(NULL) == NULL)
1906: fatal("%s: packet_get_string_ptr failed", __func__);
1907: packet_check_eom();
1908:
1909: debug("%s: %s", __func__, listen_path);
1910:
1911: c = channel_connect_by_listen_path(listen_path,
1912: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1913: free(listen_path);
1914: return c;
1915: }
1916:
1917: static Channel *
1.40 markus 1918: client_request_x11(const char *request_type, int rchan)
1919: {
1920: Channel *c = NULL;
1921: char *originator;
1.208 djm 1922: u_short originator_port;
1.67 markus 1923: int sock;
1.40 markus 1924:
1925: if (!options.forward_x11) {
1926: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1927: error("Warning: this is probably a break-in attempt by a "
1928: "malicious server.");
1.221 djm 1929: return NULL;
1930: }
1.274 djm 1931: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1932: verbose("Rejected X11 connection after ForwardX11Timeout "
1933: "expired");
1.40 markus 1934: return NULL;
1935: }
1936: originator = packet_get_string(NULL);
1937: if (datafellows & SSH_BUG_X11FWD) {
1938: debug2("buggy server: x11 request w/o originator_port");
1939: originator_port = 0;
1940: } else {
1941: originator_port = packet_get_int();
1942: }
1.93 markus 1943: packet_check_eom();
1.40 markus 1944: /* XXX check permission */
1.47 markus 1945: debug("client_request_x11: request from %s %d", originator,
1946: originator_port);
1.250 djm 1947: free(originator);
1.40 markus 1948: sock = x11_connect_display();
1.67 markus 1949: if (sock < 0)
1950: return NULL;
1951: c = channel_new("x11",
1952: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1953: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1954: c->force_drain = 1;
1.40 markus 1955: return c;
1956: }
1957:
1.103 deraadt 1958: static Channel *
1.40 markus 1959: client_request_agent(const char *request_type, int rchan)
1960: {
1961: Channel *c = NULL;
1.262 djm 1962: int r, sock;
1.40 markus 1963:
1964: if (!options.forward_agent) {
1965: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1966: error("Warning: this is probably a break-in attempt by a "
1967: "malicious server.");
1.40 markus 1968: return NULL;
1969: }
1.262 djm 1970: if ((r = ssh_get_authentication_socket(&sock)) != 0) {
1971: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1972: debug("%s: ssh_get_authentication_socket: %s",
1973: __func__, ssh_err(r));
1.67 markus 1974: return NULL;
1.262 djm 1975: }
1.67 markus 1976: c = channel_new("authentication agent connection",
1977: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1978: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1979: "authentication agent connection", 1);
1.82 markus 1980: c->force_drain = 1;
1.40 markus 1981: return c;
1.180 djm 1982: }
1983:
1984: int
1985: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1986: {
1987: Channel *c;
1988: int fd;
1989:
1990: if (tun_mode == SSH_TUNMODE_NO)
1991: return 0;
1992:
1993: if (!compat20) {
1.207 stevesk 1994: error("Tunnel forwarding is not supported for protocol 1");
1.180 djm 1995: return -1;
1996: }
1997:
1998: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1999:
2000: /* Open local tunnel device */
2001: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
2002: error("Tunnel device open failed.");
2003: return -1;
2004: }
2005:
2006: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
2007: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
2008: c->datagram = 1;
2009:
2010: packet_start(SSH2_MSG_CHANNEL_OPEN);
2011: packet_put_cstring("tun@openssh.com");
2012: packet_put_int(c->self);
2013: packet_put_int(c->local_window_max);
2014: packet_put_int(c->local_maxpacket);
2015: packet_put_int(tun_mode);
2016: packet_put_int(remote_tun);
2017: packet_send();
2018:
2019: return 0;
1.40 markus 2020: }
2021:
1.22 markus 2022: /* XXXX move to generic input handler */
1.264 markus 2023: static int
1.94 markus 2024: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 2025: {
2026: Channel *c = NULL;
2027: char *ctype;
2028: int rchan;
1.102 markus 2029: u_int rmaxpack, rwindow, len;
1.22 markus 2030:
2031: ctype = packet_get_string(&len);
2032: rchan = packet_get_int();
2033: rwindow = packet_get_int();
2034: rmaxpack = packet_get_int();
2035:
1.24 markus 2036: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 2037: ctype, rchan, rwindow, rmaxpack);
2038:
1.40 markus 2039: if (strcmp(ctype, "forwarded-tcpip") == 0) {
2040: c = client_request_forwarded_tcpip(ctype, rchan);
1.261 millert 2041: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
2042: c = client_request_forwarded_streamlocal(ctype, rchan);
1.40 markus 2043: } else if (strcmp(ctype, "x11") == 0) {
2044: c = client_request_x11(ctype, rchan);
2045: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
2046: c = client_request_agent(ctype, rchan);
1.22 markus 2047: }
2048: /* XXX duplicate : */
2049: if (c != NULL) {
2050: debug("confirm %s", ctype);
2051: c->remote_id = rchan;
2052: c->remote_window = rwindow;
2053: c->remote_maxpacket = rmaxpack;
1.69 markus 2054: if (c->type != SSH_CHANNEL_CONNECTING) {
2055: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
2056: packet_put_int(c->remote_id);
2057: packet_put_int(c->self);
2058: packet_put_int(c->local_window);
2059: packet_put_int(c->local_maxpacket);
2060: packet_send();
2061: }
1.22 markus 2062: } else {
2063: debug("failure %s", ctype);
2064: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
2065: packet_put_int(rchan);
2066: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 2067: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 2068: packet_put_cstring("open failed");
1.66 markus 2069: packet_put_cstring("");
2070: }
1.22 markus 2071: packet_send();
2072: }
1.250 djm 2073: free(ctype);
1.264 markus 2074: return 0;
1.22 markus 2075: }
1.267 djm 2076:
1.264 markus 2077: static int
1.94 markus 2078: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 2079: {
2080: Channel *c = NULL;
1.123 djm 2081: int exitval, id, reply, success = 0;
1.48 markus 2082: char *rtype;
2083:
2084: id = packet_get_int();
2085: rtype = packet_get_string(NULL);
2086: reply = packet_get_char();
2087:
2088: debug("client_input_channel_req: channel %d rtype %s reply %d",
2089: id, rtype, reply);
2090:
1.128 djm 2091: if (id == -1) {
2092: error("client_input_channel_req: request for channel -1");
2093: } else if ((c = channel_lookup(id)) == NULL) {
1.197 djm 2094: error("client_input_channel_req: channel %d: "
2095: "unknown channel", id);
1.193 markus 2096: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
2097: packet_check_eom();
2098: chan_rcvd_eow(c);
1.48 markus 2099: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 2100: exitval = packet_get_int();
1.217 djm 2101: if (c->ctl_chan != -1) {
2102: mux_exit_message(c, exitval);
1.215 djm 2103: success = 1;
2104: } else if (id == session_ident) {
2105: /* Record exit value of local session */
1.123 djm 2106: success = 1;
2107: exit_status = exitval;
1.215 djm 2108: } else {
1.218 djm 2109: /* Probably for a mux channel that has already closed */
2110: debug("%s: no sink for exit-status on channel %d",
2111: __func__, id);
1.123 djm 2112: }
1.93 markus 2113: packet_check_eom();
1.48 markus 2114: }
1.259 djm 2115: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.48 markus 2116: packet_start(success ?
2117: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 2118: packet_put_int(c->remote_id);
1.48 markus 2119: packet_send();
2120: }
1.250 djm 2121: free(rtype);
1.264 markus 2122: return 0;
1.48 markus 2123: }
1.267 djm 2124:
1.269 djm 2125: struct hostkeys_update_ctx {
2126: /* The hostname and (optionally) IP address string for the server */
2127: char *host_str, *ip_str;
2128:
2129: /*
2130: * Keys received from the server and a flag for each indicating
2131: * whether they already exist in known_hosts.
2132: * keys_seen is filled in by hostkeys_find() and later (for new
2133: * keys) by client_global_hostkeys_private_confirm().
2134: */
2135: struct sshkey **keys;
2136: int *keys_seen;
2137: size_t nkeys;
2138:
2139: size_t nnew;
2140:
2141: /*
2142: * Keys that are in known_hosts, but were not present in the update
2143: * from the server (i.e. scheduled to be deleted).
2144: * Filled in by hostkeys_find().
2145: */
2146: struct sshkey **old_keys;
2147: size_t nold;
2148: };
2149:
2150: static void
2151: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
2152: {
2153: size_t i;
2154:
2155: if (ctx == NULL)
2156: return;
2157: for (i = 0; i < ctx->nkeys; i++)
2158: sshkey_free(ctx->keys[i]);
2159: free(ctx->keys);
2160: free(ctx->keys_seen);
2161: for (i = 0; i < ctx->nold; i++)
2162: sshkey_free(ctx->old_keys[i]);
2163: free(ctx->old_keys);
2164: free(ctx->host_str);
2165: free(ctx->ip_str);
2166: free(ctx);
2167: }
2168:
2169: static int
2170: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
2171: {
2172: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2173: size_t i;
2174: struct sshkey **tmp;
2175:
2176: if (l->status != HKF_STATUS_MATCHED || l->key == NULL ||
2177: l->key->type == KEY_RSA1)
2178: return 0;
2179:
2180: /* Mark off keys we've already seen for this host */
2181: for (i = 0; i < ctx->nkeys; i++) {
2182: if (sshkey_equal(l->key, ctx->keys[i])) {
2183: debug3("%s: found %s key at %s:%ld", __func__,
2184: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
2185: ctx->keys_seen[i] = 1;
2186: return 0;
2187: }
2188: }
2189: /* This line contained a key that not offered by the server */
2190: debug3("%s: deprecated %s key at %s:%ld", __func__,
2191: sshkey_ssh_name(l->key), l->path, l->linenum);
2192: if ((tmp = reallocarray(ctx->old_keys, ctx->nold + 1,
2193: sizeof(*ctx->old_keys))) == NULL)
2194: fatal("%s: reallocarray failed nold = %zu",
2195: __func__, ctx->nold);
2196: ctx->old_keys = tmp;
2197: ctx->old_keys[ctx->nold++] = l->key;
2198: l->key = NULL;
2199:
2200: return 0;
2201: }
2202:
2203: static void
2204: update_known_hosts(struct hostkeys_update_ctx *ctx)
2205: {
1.271 djm 2206: int r, was_raw = 0;
2207: int loglevel = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK ?
1.269 djm 2208: SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
2209: char *fp, *response;
2210: size_t i;
2211:
2212: for (i = 0; i < ctx->nkeys; i++) {
2213: if (ctx->keys_seen[i] != 2)
2214: continue;
2215: if ((fp = sshkey_fingerprint(ctx->keys[i],
2216: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2217: fatal("%s: sshkey_fingerprint failed", __func__);
2218: do_log2(loglevel, "Learned new hostkey: %s %s",
2219: sshkey_type(ctx->keys[i]), fp);
2220: free(fp);
2221: }
2222: for (i = 0; i < ctx->nold; i++) {
2223: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2224: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2225: fatal("%s: sshkey_fingerprint failed", __func__);
2226: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2227: sshkey_type(ctx->old_keys[i]), fp);
2228: free(fp);
2229: }
2230: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2231: if (get_saved_tio() != NULL) {
2232: leave_raw_mode(1);
2233: was_raw = 1;
2234: }
1.269 djm 2235: response = NULL;
2236: for (i = 0; !quit_pending && i < 3; i++) {
2237: free(response);
2238: response = read_passphrase("Accept updated hostkeys? "
2239: "(yes/no): ", RP_ECHO);
2240: if (strcasecmp(response, "yes") == 0)
2241: break;
2242: else if (quit_pending || response == NULL ||
2243: strcasecmp(response, "no") == 0) {
2244: options.update_hostkeys = 0;
2245: break;
2246: } else {
2247: do_log2(loglevel, "Please enter "
2248: "\"yes\" or \"no\"");
2249: }
2250: }
2251: if (quit_pending || i >= 3 || response == NULL)
2252: options.update_hostkeys = 0;
2253: free(response);
1.271 djm 2254: if (was_raw)
2255: enter_raw_mode(1);
1.269 djm 2256: }
2257:
2258: /*
2259: * Now that all the keys are verified, we can go ahead and replace
2260: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2261: * cancel the operation).
2262: */
2263: if (options.update_hostkeys != 0 &&
2264: (r = hostfile_replace_entries(options.user_hostfiles[0],
2265: ctx->host_str, ctx->ip_str, ctx->keys, ctx->nkeys,
2266: options.hash_known_hosts, 0,
2267: options.fingerprint_hash)) != 0)
2268: error("%s: hostfile_replace_entries failed: %s",
2269: __func__, ssh_err(r));
2270: }
2271:
2272: static void
2273: client_global_hostkeys_private_confirm(int type, u_int32_t seq, void *_ctx)
2274: {
2275: struct ssh *ssh = active_state; /* XXX */
2276: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2277: size_t i, ndone;
2278: struct sshbuf *signdata;
2279: int r;
2280: const u_char *sig;
2281: size_t siglen;
2282:
2283: if (ctx->nnew == 0)
2284: fatal("%s: ctx->nnew == 0", __func__); /* sanity */
2285: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2286: error("Server failed to confirm ownership of "
2287: "private host keys");
2288: hostkeys_update_ctx_free(ctx);
2289: return;
2290: }
2291: if ((signdata = sshbuf_new()) == NULL)
2292: fatal("%s: sshbuf_new failed", __func__);
2293: /* Don't want to accidentally accept an unbound signature */
2294: if (ssh->kex->session_id_len == 0)
2295: fatal("%s: ssh->kex->session_id_len == 0", __func__);
2296: /*
2297: * Expect a signature for each of the ctx->nnew private keys we
2298: * haven't seen before. They will be in the same order as the
2299: * ctx->keys where the corresponding ctx->keys_seen[i] == 0.
2300: */
2301: for (ndone = i = 0; i < ctx->nkeys; i++) {
2302: if (ctx->keys_seen[i])
2303: continue;
2304: /* Prepare data to be signed: session ID, unique string, key */
2305: sshbuf_reset(signdata);
1.270 djm 2306: if ( (r = sshbuf_put_cstring(signdata,
2307: "hostkeys-prove-00@openssh.com")) != 0 ||
2308: (r = sshbuf_put_string(signdata, ssh->kex->session_id,
1.269 djm 2309: ssh->kex->session_id_len)) != 0 ||
2310: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
2311: fatal("%s: failed to prepare signature: %s",
2312: __func__, ssh_err(r));
2313: /* Extract and verify signature */
2314: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
2315: error("%s: couldn't parse message: %s",
2316: __func__, ssh_err(r));
2317: goto out;
2318: }
2319: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
2320: sshbuf_ptr(signdata), sshbuf_len(signdata), 0)) != 0) {
2321: error("%s: server gave bad signature for %s key %zu",
2322: __func__, sshkey_type(ctx->keys[i]), i);
2323: goto out;
2324: }
2325: /* Key is good. Mark it as 'seen' */
2326: ctx->keys_seen[i] = 2;
2327: ndone++;
2328: }
2329: if (ndone != ctx->nnew)
2330: fatal("%s: ndone != ctx->nnew (%zu / %zu)", __func__,
2331: ndone, ctx->nnew); /* Shouldn't happen */
2332: ssh_packet_check_eom(ssh);
2333:
2334: /* Make the edits to known_hosts */
2335: update_known_hosts(ctx);
2336: out:
2337: hostkeys_update_ctx_free(ctx);
2338: }
2339:
1.267 djm 2340: /*
1.270 djm 2341: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2342: * the server's hostkeys. The keys are checked against the user's
2343: * HostkeyAlgorithms preference before they are accepted.
2344: */
2345: static int
2346: client_input_hostkeys(void)
2347: {
1.269 djm 2348: struct ssh *ssh = active_state; /* XXX */
1.267 djm 2349: const u_char *blob = NULL;
1.269 djm 2350: size_t i, len = 0;
1.267 djm 2351: struct sshbuf *buf = NULL;
1.269 djm 2352: struct sshkey *key = NULL, **tmp;
2353: int r;
2354: char *fp;
1.267 djm 2355: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2356: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2357: struct hostkeys_update_ctx *ctx = NULL;
1.267 djm 2358:
2359: if (hostkeys_seen)
2360: fatal("%s: server already sent hostkeys", __func__);
1.269 djm 2361: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2362: options.batch_mode)
2363: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2364: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2365: return 1;
1.272 djm 2366:
2367: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2368: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2369: sshkey_free(key);
2370: key = NULL;
1.269 djm 2371: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
2372: error("%s: couldn't parse message: %s",
2373: __func__, ssh_err(r));
2374: goto out;
2375: }
1.270 djm 2376: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
2377: error("%s: parse key: %s", __func__, ssh_err(r));
2378: goto out;
2379: }
1.267 djm 2380: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2381: SSH_FP_DEFAULT);
2382: debug3("%s: received %s key %s", __func__,
2383: sshkey_type(key), fp);
2384: free(fp);
1.275 markus 2385:
1.267 djm 2386: /* Check that the key is accepted in HostkeyAlgorithms */
1.275 markus 2387: if (match_pattern_list(sshkey_ssh_name(key),
2388: options.hostkeyalgorithms ? options.hostkeyalgorithms :
2389: KEX_DEFAULT_PK_ALG, 0) != 1) {
1.267 djm 2390: debug3("%s: %s key not permitted by HostkeyAlgorithms",
2391: __func__, sshkey_ssh_name(key));
2392: continue;
2393: }
1.269 djm 2394: /* Skip certs */
2395: if (sshkey_is_cert(key)) {
2396: debug3("%s: %s key is a certificate; skipping",
2397: __func__, sshkey_ssh_name(key));
2398: continue;
2399: }
2400: /* Ensure keys are unique */
2401: for (i = 0; i < ctx->nkeys; i++) {
2402: if (sshkey_equal(key, ctx->keys[i])) {
2403: error("%s: received duplicated %s host key",
2404: __func__, sshkey_ssh_name(key));
2405: goto out;
2406: }
2407: }
2408: /* Key is good, record it */
2409: if ((tmp = reallocarray(ctx->keys, ctx->nkeys + 1,
2410: sizeof(*ctx->keys))) == NULL)
2411: fatal("%s: reallocarray failed nkeys = %zu",
2412: __func__, ctx->nkeys);
2413: ctx->keys = tmp;
2414: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2415: key = NULL;
2416: }
2417:
1.269 djm 2418: if (ctx->nkeys == 0) {
1.270 djm 2419: debug("%s: server sent no hostkeys", __func__);
1.267 djm 2420: goto out;
2421: }
1.270 djm 2422:
1.269 djm 2423: if ((ctx->keys_seen = calloc(ctx->nkeys,
2424: sizeof(*ctx->keys_seen))) == NULL)
2425: fatal("%s: calloc failed", __func__);
1.267 djm 2426:
1.268 djm 2427: get_hostfile_hostname_ipaddr(host,
2428: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2429: options.port, &ctx->host_str,
2430: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2431:
1.269 djm 2432: /* Find which keys we already know about. */
2433: if ((r = hostkeys_foreach(options.user_hostfiles[0], hostkeys_find,
2434: ctx, ctx->host_str, ctx->ip_str,
2435: HKF_WANT_PARSE_KEY|HKF_WANT_MATCH)) != 0) {
2436: error("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1.267 djm 2437: goto out;
2438: }
2439:
1.269 djm 2440: /* Figure out if we have any new keys to add */
2441: ctx->nnew = 0;
2442: for (i = 0; i < ctx->nkeys; i++) {
2443: if (!ctx->keys_seen[i])
2444: ctx->nnew++;
2445: }
2446:
2447: debug3("%s: %zu keys from server: %zu new, %zu retained. %zu to remove",
2448: __func__, ctx->nkeys, ctx->nnew, ctx->nkeys - ctx->nnew, ctx->nold);
2449:
2450: if (ctx->nnew == 0 && ctx->nold != 0) {
2451: /* We have some keys to remove. Just do it. */
2452: update_known_hosts(ctx);
2453: } else if (ctx->nnew != 0) {
2454: /*
2455: * We have received hitherto-unseen keys from the server.
2456: * Ask the server to confirm ownership of the private halves.
2457: */
2458: debug3("%s: asking server to prove ownership for %zu keys",
2459: __func__, ctx->nnew);
2460: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2461: (r = sshpkt_put_cstring(ssh,
1.270 djm 2462: "hostkeys-prove-00@openssh.com")) != 0 ||
1.269 djm 2463: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
2464: fatal("%s: cannot prepare packet: %s",
2465: __func__, ssh_err(r));
2466: if ((buf = sshbuf_new()) == NULL)
2467: fatal("%s: sshbuf_new", __func__);
2468: for (i = 0; i < ctx->nkeys; i++) {
2469: if (ctx->keys_seen[i])
2470: continue;
2471: sshbuf_reset(buf);
2472: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0)
2473: fatal("%s: sshkey_putb: %s",
2474: __func__, ssh_err(r));
2475: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
2476: fatal("%s: sshpkt_put_string: %s",
2477: __func__, ssh_err(r));
2478: }
2479: if ((r = sshpkt_send(ssh)) != 0)
2480: fatal("%s: sshpkt_send: %s", __func__, ssh_err(r));
2481: client_register_global_confirm(
2482: client_global_hostkeys_private_confirm, ctx);
2483: ctx = NULL; /* will be freed in callback */
2484: }
2485:
1.267 djm 2486: /* Success */
2487: out:
1.269 djm 2488: hostkeys_update_ctx_free(ctx);
1.267 djm 2489: sshkey_free(key);
2490: sshbuf_free(buf);
1.269 djm 2491: /*
2492: * NB. Return success for all cases. The server doesn't need to know
2493: * what the client does with its hosts file.
2494: */
2495: return 1;
1.267 djm 2496: }
2497:
1.264 markus 2498: static int
1.95 markus 2499: client_input_global_request(int type, u_int32_t seq, void *ctxt)
2500: {
2501: char *rtype;
2502: int want_reply;
2503: int success = 0;
2504:
1.267 djm 2505: rtype = packet_get_cstring(NULL);
1.95 markus 2506: want_reply = packet_get_char();
1.117 markus 2507: debug("client_input_global_request: rtype %s want_reply %d",
2508: rtype, want_reply);
1.270 djm 2509: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.267 djm 2510: success = client_input_hostkeys();
1.95 markus 2511: if (want_reply) {
2512: packet_start(success ?
2513: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
2514: packet_send();
2515: packet_write_wait();
2516: }
1.250 djm 2517: free(rtype);
1.264 markus 2518: return 0;
1.95 markus 2519: }
1.22 markus 2520:
1.123 djm 2521: void
1.129 deraadt 2522: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 2523: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 2524: {
2525: int len;
1.132 djm 2526: Channel *c = NULL;
1.123 djm 2527:
2528: debug2("%s: id %d", __func__, id);
2529:
1.132 djm 2530: if ((c = channel_lookup(id)) == NULL)
2531: fatal("client_session2_setup: channel %d: unknown channel", id);
1.224 djm 2532:
2533: packet_set_interactive(want_tty,
2534: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2535:
1.123 djm 2536: if (want_tty) {
2537: struct winsize ws;
2538:
2539: /* Store window size in the packet. */
2540: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2541: memset(&ws, 0, sizeof(ws));
2542:
1.190 djm 2543: channel_request_start(id, "pty-req", 1);
1.234 djm 2544: client_expect_confirm(id, "PTY allocation", CONFIRM_TTY);
1.123 djm 2545: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 2546: packet_put_int((u_int)ws.ws_col);
2547: packet_put_int((u_int)ws.ws_row);
2548: packet_put_int((u_int)ws.ws_xpixel);
2549: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 2550: if (tiop == NULL)
2551: tiop = get_saved_tio();
2552: tty_make_modes(-1, tiop);
1.123 djm 2553: packet_send();
2554: /* XXX wait for reply */
1.132 djm 2555: c->client_tty = 1;
1.123 djm 2556: }
2557:
2558: /* Transfer any environment variables from client to server */
1.126 djm 2559: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2560: int i, j, matched;
2561: char *name, *val;
2562:
2563: debug("Sending environment.");
1.126 djm 2564: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2565: /* Split */
1.126 djm 2566: name = xstrdup(env[i]);
1.123 djm 2567: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2568: free(name);
1.123 djm 2569: continue;
2570: }
2571: *val++ = '\0';
2572:
2573: matched = 0;
2574: for (j = 0; j < options.num_send_env; j++) {
2575: if (match_pattern(name, options.send_env[j])) {
2576: matched = 1;
2577: break;
2578: }
2579: }
2580: if (!matched) {
2581: debug3("Ignored env %s", name);
1.250 djm 2582: free(name);
1.123 djm 2583: continue;
2584: }
2585:
2586: debug("Sending env %s = %s", name, val);
2587: channel_request_start(id, "env", 0);
2588: packet_put_cstring(name);
2589: packet_put_cstring(val);
2590: packet_send();
1.250 djm 2591: free(name);
1.123 djm 2592: }
2593: }
2594:
2595: len = buffer_len(cmd);
2596: if (len > 0) {
2597: if (len > 900)
2598: len = 900;
2599: if (want_subsystem) {
1.190 djm 2600: debug("Sending subsystem: %.*s",
2601: len, (u_char*)buffer_ptr(cmd));
2602: channel_request_start(id, "subsystem", 1);
1.234 djm 2603: client_expect_confirm(id, "subsystem", CONFIRM_CLOSE);
1.123 djm 2604: } else {
1.190 djm 2605: debug("Sending command: %.*s",
2606: len, (u_char*)buffer_ptr(cmd));
2607: channel_request_start(id, "exec", 1);
1.234 djm 2608: client_expect_confirm(id, "exec", CONFIRM_CLOSE);
1.123 djm 2609: }
2610: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2611: packet_send();
2612: } else {
1.190 djm 2613: channel_request_start(id, "shell", 1);
1.234 djm 2614: client_expect_confirm(id, "shell", CONFIRM_CLOSE);
1.123 djm 2615: packet_send();
2616: }
2617: }
2618:
1.77 itojun 2619: static void
1.49 itojun 2620: client_init_dispatch_20(void)
1.16 markus 2621: {
1.55 markus 2622: dispatch_init(&dispatch_protocol_error);
1.100 markus 2623:
1.16 markus 2624: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2625: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2626: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2627: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2628: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2629: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2630: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2631: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2632: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2633: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2634: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2635: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2636:
2637: /* rekeying */
2638: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2639:
2640: /* global request reply messages */
2641: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2642: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 2643: }
1.197 djm 2644:
1.77 itojun 2645: static void
1.49 itojun 2646: client_init_dispatch_13(void)
1.15 markus 2647: {
2648: dispatch_init(NULL);
2649: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2650: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2651: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2652: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2653: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2654: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2655: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2656: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2657: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2658:
2659: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2660: &client_input_agent_open : &deny_input_open);
1.39 markus 2661: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2662: &x11_input_open : &deny_input_open);
1.15 markus 2663: }
1.197 djm 2664:
1.77 itojun 2665: static void
1.49 itojun 2666: client_init_dispatch_15(void)
1.15 markus 2667: {
2668: client_init_dispatch_13();
2669: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2670: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2671: }
1.197 djm 2672:
1.79 stevesk 2673: static void
1.49 itojun 2674: client_init_dispatch(void)
1.15 markus 2675: {
1.16 markus 2676: if (compat20)
2677: client_init_dispatch_20();
2678: else if (compat13)
1.15 markus 2679: client_init_dispatch_13();
2680: else
2681: client_init_dispatch_15();
1.232 djm 2682: }
2683:
2684: void
2685: client_stop_mux(void)
2686: {
2687: if (options.control_path != NULL && muxserver_sock != -1)
2688: unlink(options.control_path);
2689: /*
1.247 dtucker 2690: * If we are in persist mode, or don't have a shell, signal that we
2691: * should close when all active channels are closed.
1.232 djm 2692: */
1.247 dtucker 2693: if (options.control_persist || no_shell_flag) {
1.232 djm 2694: session_closed = 1;
1.235 djm 2695: setproctitle("[stopped mux]");
2696: }
1.113 markus 2697: }
2698:
2699: /* client specific fatal cleanup */
2700: void
1.114 markus 2701: cleanup_exit(int i)
1.113 markus 2702: {
1.233 djm 2703: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2704: leave_non_blocking();
1.192 djm 2705: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2706: unlink(options.control_path);
1.223 djm 2707: ssh_kill_proxy_command();
1.114 markus 2708: _exit(i);
1.1 deraadt 2709: }
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