Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.287
1.287 ! deraadt 1: /* $OpenBSD: clientloop.c,v 1.286 2016/07/23 02:54:08 djm 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:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.189 djm 68: #include <sys/queue.h>
1.150 stevesk 69:
1.155 stevesk 70: #include <ctype.h>
1.168 stevesk 71: #include <errno.h>
1.151 stevesk 72: #include <paths.h>
1.153 stevesk 73: #include <signal.h>
1.174 stevesk 74: #include <stdio.h>
1.173 stevesk 75: #include <stdlib.h>
1.170 stevesk 76: #include <string.h>
1.150 stevesk 77: #include <termios.h>
1.175 deraadt 78: #include <pwd.h>
1.169 stevesk 79: #include <unistd.h>
1.266 deraadt 80: #include <limits.h>
1.1 deraadt 81:
1.175 deraadt 82: #include "xmalloc.h"
1.45 markus 83: #include "ssh.h"
84: #include "ssh1.h"
85: #include "ssh2.h"
1.1 deraadt 86: #include "packet.h"
87: #include "buffer.h"
1.15 markus 88: #include "compat.h"
1.74 markus 89: #include "channels.h"
1.15 markus 90: #include "dispatch.h"
1.40 markus 91: #include "key.h"
1.175 deraadt 92: #include "cipher.h"
1.54 markus 93: #include "kex.h"
1.275 markus 94: #include "myproposal.h"
1.45 markus 95: #include "log.h"
1.261 millert 96: #include "misc.h"
1.45 markus 97: #include "readconf.h"
98: #include "clientloop.h"
1.147 djm 99: #include "sshconnect.h"
1.40 markus 100: #include "authfd.h"
1.45 markus 101: #include "atomicio.h"
1.118 deraadt 102: #include "sshpty.h"
1.123 djm 103: #include "match.h"
104: #include "msg.h"
1.262 djm 105: #include "ssherr.h"
1.267 djm 106: #include "hostfile.h"
1.39 markus 107:
108: /* import options */
109: extern Options options;
110:
1.1 deraadt 111: /* Flag indicating that stdin should be redirected from /dev/null. */
112: extern int stdin_null_flag;
113:
1.116 dtucker 114: /* Flag indicating that no shell has been requested */
115: extern int no_shell_flag;
116:
1.286 djm 117: /* Flag indicating that ssh should daemonise after authentication is complete */
118: extern int fork_after_authentication_flag;
119:
1.123 djm 120: /* Control socket */
1.217 djm 121: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 122:
1.13 markus 123: /*
124: * Name of the host we are connecting to. This is the name given on the
125: * command line, or the HostName specified for the user-supplied name in a
126: * configuration file.
127: */
1.1 deraadt 128: extern char *host;
129:
1.13 markus 130: /*
131: * Flag to indicate that we have received a window change signal which has
132: * not yet been processed. This will cause a message indicating the new
133: * window size to be sent to the server a little later. This is volatile
134: * because this is updated in a signal handler.
135: */
1.88 markus 136: static volatile sig_atomic_t received_window_change_signal = 0;
137: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 138:
1.145 djm 139: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 140: static int in_non_blocking_mode = 0;
141:
1.222 djm 142: /* Time when backgrounded control master using ControlPersist should exit */
143: static time_t control_persist_exit_time = 0;
144:
1.1 deraadt 145: /* Common data for the client loop code. */
1.217 djm 146: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.195 djm 147: static int escape_char1; /* Escape character. (proto1 only) */
148: static int escape_pending1; /* Last character was an escape (proto1 only) */
1.11 markus 149: static int last_was_cr; /* Last character was a newline. */
1.197 djm 150: static int exit_status; /* Used to store the command exit status. */
151: static int stdin_eof; /* EOF has been encountered on stderr. */
1.11 markus 152: static Buffer stdin_buffer; /* Buffer for stdin data. */
153: static Buffer stdout_buffer; /* Buffer for stdout data. */
154: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.221 djm 155: static u_int buffer_high; /* Soft max buffer size. */
1.11 markus 156: static int connection_in; /* Connection to server (input). */
157: static int connection_out; /* Connection to server (output). */
1.56 markus 158: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 159: static int session_closed; /* In SSH2: login session closed. */
1.274 djm 160: static u_int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.1 deraadt 161:
1.77 itojun 162: static void client_init_dispatch(void);
1.16 markus 163: int session_ident = -1;
164:
1.195 djm 165: /* Track escape per proto2 channel */
166: struct escape_filter_ctx {
167: int escape_pending;
168: int escape_char;
169: };
170:
171: /* Context for channel confirmation replies */
1.190 djm 172: struct channel_reply_ctx {
173: const char *request_type;
1.234 djm 174: int id;
175: enum confirm_action action;
1.190 djm 176: };
177:
1.196 djm 178: /* Global request success/failure callbacks */
179: struct global_confirm {
180: TAILQ_ENTRY(global_confirm) entry;
181: global_confirm_cb *cb;
182: void *ctx;
183: int ref_count;
184: };
185: TAILQ_HEAD(global_confirms, global_confirm);
186: static struct global_confirms global_confirms =
187: TAILQ_HEAD_INITIALIZER(global_confirms);
188:
1.123 djm 189: void ssh_process_session2_setup(int, int, int, Buffer *);
190:
1.1 deraadt 191: /* Restores stdin to blocking mode. */
192:
1.77 itojun 193: static void
1.49 itojun 194: leave_non_blocking(void)
1.1 deraadt 195: {
1.11 markus 196: if (in_non_blocking_mode) {
1.125 djm 197: unset_nonblock(fileno(stdin));
1.11 markus 198: in_non_blocking_mode = 0;
199: }
1.1 deraadt 200: }
201:
1.11 markus 202: /* Puts stdin terminal in non-blocking mode. */
203:
1.77 itojun 204: static void
1.49 itojun 205: enter_non_blocking(void)
1.1 deraadt 206: {
1.11 markus 207: in_non_blocking_mode = 1;
1.124 djm 208: set_nonblock(fileno(stdin));
1.1 deraadt 209: }
210:
1.13 markus 211: /*
212: * Signal handler for the window change signal (SIGWINCH). This just sets a
213: * flag indicating that the window has changed.
214: */
1.157 deraadt 215: /*ARGSUSED */
1.77 itojun 216: static void
1.11 markus 217: window_change_handler(int sig)
1.1 deraadt 218: {
1.11 markus 219: received_window_change_signal = 1;
220: signal(SIGWINCH, window_change_handler);
1.1 deraadt 221: }
222:
1.13 markus 223: /*
224: * Signal handler for signals that cause the program to terminate. These
225: * signals must be trapped to restore terminal modes.
226: */
1.157 deraadt 227: /*ARGSUSED */
1.77 itojun 228: static void
1.11 markus 229: signal_handler(int sig)
1.1 deraadt 230: {
1.75 markus 231: received_signal = sig;
232: quit_pending = 1;
1.1 deraadt 233: }
234:
1.13 markus 235: /*
236: * Returns current time in seconds from Jan 1, 1970 with the maximum
237: * available resolution.
238: */
1.1 deraadt 239:
1.77 itojun 240: static double
1.49 itojun 241: get_current_time(void)
1.1 deraadt 242: {
1.11 markus 243: struct timeval tv;
244: gettimeofday(&tv, NULL);
245: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 246: }
247:
1.222 djm 248: /*
249: * Sets control_persist_exit_time to the absolute time when the
250: * backgrounded control master should exit due to expiry of the
251: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
252: * control master process, or if there is no ControlPersist timeout.
253: */
254: static void
255: set_control_persist_exit_time(void)
256: {
257: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 258: || options.control_persist_timeout == 0) {
1.222 djm 259: /* not using a ControlPersist timeout */
260: control_persist_exit_time = 0;
1.232 djm 261: } else if (channel_still_open()) {
1.222 djm 262: /* some client connections are still open */
263: if (control_persist_exit_time > 0)
264: debug2("%s: cancel scheduled exit", __func__);
265: control_persist_exit_time = 0;
266: } else if (control_persist_exit_time <= 0) {
267: /* a client connection has recently closed */
1.251 dtucker 268: control_persist_exit_time = monotime() +
1.222 djm 269: (time_t)options.control_persist_timeout;
270: debug2("%s: schedule exit in %d seconds", __func__,
271: options.control_persist_timeout);
272: }
273: /* else we are already counting down to the timeout */
274: }
275:
1.238 dtucker 276: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
277: static int
278: client_x11_display_valid(const char *display)
279: {
280: size_t i, dlen;
281:
1.279 djm 282: if (display == NULL)
283: return 0;
284:
1.238 dtucker 285: dlen = strlen(display);
286: for (i = 0; i < dlen; i++) {
1.256 deraadt 287: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 288: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
289: debug("Invalid character '%c' in DISPLAY", display[i]);
290: return 0;
291: }
292: }
293: return 1;
294: }
295:
1.274 djm 296: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
297: #define X11_TIMEOUT_SLACK 60
1.279 djm 298: int
1.138 djm 299: client_x11_get_proto(const char *display, const char *xauth_path,
1.221 djm 300: u_int trusted, u_int timeout, char **_proto, char **_data)
1.138 djm 301: {
1.279 djm 302: char cmd[1024], line[512], xdisplay[512];
303: char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
1.138 djm 304: static char proto[512], data[512];
305: FILE *f;
1.279 djm 306: int got_data = 0, generated = 0, do_unlink = 0, i, r;
1.138 djm 307: struct stat st;
1.274 djm 308: u_int now, x11_timeout_real;
1.138 djm 309:
310: *_proto = proto;
311: *_data = data;
1.279 djm 312: proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
1.138 djm 313:
1.279 djm 314: if (!client_x11_display_valid(display)) {
1.283 millert 315: if (display != NULL)
316: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
317: display);
1.279 djm 318: return -1;
319: }
320: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
1.138 djm 321: debug("No xauth program.");
1.279 djm 322: xauth_path = NULL;
323: }
324:
325: if (xauth_path != NULL) {
1.138 djm 326: /*
327: * Handle FamilyLocal case where $DISPLAY does
328: * not match an authorization entry. For this we
329: * just try "xauth list unix:displaynum.screennum".
330: * XXX: "localhost" match to determine FamilyLocal
331: * is not perfect.
332: */
333: if (strncmp(display, "localhost:", 10) == 0) {
1.279 djm 334: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
335: display + 10)) < 0 ||
336: (size_t)r >= sizeof(xdisplay)) {
337: error("%s: display name too long", __func__);
338: return -1;
339: }
1.138 djm 340: display = xdisplay;
341: }
342: if (trusted == 0) {
1.274 djm 343: /*
1.279 djm 344: * Generate an untrusted X11 auth cookie.
345: *
1.274 djm 346: * The authentication cookie should briefly outlive
347: * ssh's willingness to forward X11 connections to
348: * avoid nasty fail-open behaviour in the X server.
349: */
1.279 djm 350: mktemp_proto(xauthdir, sizeof(xauthdir));
351: if (mkdtemp(xauthdir) == NULL) {
352: error("%s: mkdtemp: %s",
353: __func__, strerror(errno));
354: return -1;
355: }
356: do_unlink = 1;
357: if ((r = snprintf(xauthfile, sizeof(xauthfile),
358: "%s/xauthfile", xauthdir)) < 0 ||
359: (size_t)r >= sizeof(xauthfile)) {
360: error("%s: xauthfile path too long", __func__);
361: unlink(xauthfile);
362: rmdir(xauthdir);
363: return -1;
364: }
365:
1.274 djm 366: if (timeout >= UINT_MAX - X11_TIMEOUT_SLACK)
367: x11_timeout_real = UINT_MAX;
368: else
369: x11_timeout_real = timeout + X11_TIMEOUT_SLACK;
1.279 djm 370: if ((r = snprintf(cmd, sizeof(cmd),
371: "%s -f %s generate %s " SSH_X11_PROTO
372: " untrusted timeout %u 2>" _PATH_DEVNULL,
373: xauth_path, xauthfile, display,
374: x11_timeout_real)) < 0 ||
375: (size_t)r >= sizeof(cmd))
376: fatal("%s: cmd too long", __func__);
377: debug2("%s: %s", __func__, cmd);
378: if (x11_refuse_time == 0) {
379: now = monotime() + 1;
380: if (UINT_MAX - timeout < now)
381: x11_refuse_time = UINT_MAX;
382: else
383: x11_refuse_time = now + timeout;
384: channel_set_x11_refuse_time(x11_refuse_time);
1.138 djm 385: }
1.279 djm 386: if (system(cmd) == 0)
387: generated = 1;
1.138 djm 388: }
1.181 markus 389:
390: /*
391: * When in untrusted mode, we read the cookie only if it was
392: * successfully generated as an untrusted one in the step
393: * above.
394: */
395: if (trusted || generated) {
396: snprintf(cmd, sizeof(cmd),
397: "%s %s%s list %s 2>" _PATH_DEVNULL,
398: xauth_path,
399: generated ? "-f " : "" ,
400: generated ? xauthfile : "",
401: display);
402: debug2("x11_get_proto: %s", cmd);
403: f = popen(cmd, "r");
404: if (f && fgets(line, sizeof(line), f) &&
405: sscanf(line, "%*s %511s %511s", proto, data) == 2)
406: got_data = 1;
407: if (f)
408: pclose(f);
1.279 djm 409: }
1.138 djm 410: }
411:
412: if (do_unlink) {
413: unlink(xauthfile);
414: rmdir(xauthdir);
415: }
416:
1.279 djm 417: /* Don't fall back to fake X11 data for untrusted forwarding */
418: if (!trusted && !got_data) {
419: error("Warning: untrusted X11 forwarding setup failed: "
420: "xauth key data not generated");
421: return -1;
422: }
423:
1.138 djm 424: /*
425: * If we didn't get authentication data, just make up some
426: * data. The forwarding code will check the validity of the
427: * response anyway, and substitute this data. The X11
428: * server, however, will ignore this fake data and use
429: * whatever authentication mechanisms it was using otherwise
430: * for the local connection.
431: */
432: if (!got_data) {
433: u_int32_t rnd = 0;
434:
435: logit("Warning: No xauth data; "
436: "using fake authentication data for X11 forwarding.");
437: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
438: for (i = 0; i < 16; i++) {
439: if (i % 4 == 0)
440: rnd = arc4random();
441: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
442: rnd & 0xff);
443: rnd >>= 8;
444: }
445: }
1.279 djm 446:
447: return 0;
1.1 deraadt 448: }
449:
1.13 markus 450: /*
451: * This is called when the interactive is entered. This checks if there is
452: * an EOF coming on stdin. We must check this explicitly, as select() does
453: * not appear to wake up when redirecting from /dev/null.
454: */
1.1 deraadt 455:
1.77 itojun 456: static void
1.49 itojun 457: client_check_initial_eof_on_stdin(void)
1.1 deraadt 458: {
1.11 markus 459: int len;
460: char buf[1];
1.1 deraadt 461:
1.13 markus 462: /*
463: * If standard input is to be "redirected from /dev/null", we simply
464: * mark that we have seen an EOF and send an EOF message to the
465: * server. Otherwise, we try to read a single character; it appears
466: * that for some files, such /dev/null, select() never wakes up for
467: * read for this descriptor, which means that we never get EOF. This
468: * way we will get the EOF if stdin comes from /dev/null or similar.
469: */
1.11 markus 470: if (stdin_null_flag) {
471: /* Fake EOF on stdin. */
472: debug("Sending eof.");
473: stdin_eof = 1;
474: packet_start(SSH_CMSG_EOF);
475: packet_send();
476: } else {
477: enter_non_blocking();
478:
479: /* Check for immediate EOF on stdin. */
480: len = read(fileno(stdin), buf, 1);
481: if (len == 0) {
1.197 djm 482: /*
483: * EOF. Record that we have seen it and send
484: * EOF to server.
485: */
1.11 markus 486: debug("Sending eof.");
487: stdin_eof = 1;
488: packet_start(SSH_CMSG_EOF);
489: packet_send();
490: } else if (len > 0) {
1.13 markus 491: /*
492: * Got data. We must store the data in the buffer,
493: * and also process it as an escape character if
494: * appropriate.
495: */
1.195 djm 496: if ((u_char) buf[0] == escape_char1)
497: escape_pending1 = 1;
1.52 markus 498: else
1.11 markus 499: buffer_append(&stdin_buffer, buf, 1);
500: }
501: leave_non_blocking();
502: }
1.1 deraadt 503: }
504:
505:
1.13 markus 506: /*
507: * Make packets from buffered stdin data, and buffer them for sending to the
508: * connection.
509: */
1.1 deraadt 510:
1.77 itojun 511: static void
1.49 itojun 512: client_make_packets_from_stdin_data(void)
1.1 deraadt 513: {
1.42 markus 514: u_int len;
1.1 deraadt 515:
1.11 markus 516: /* Send buffered stdin data to the server. */
517: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 518: packet_not_very_much_data_to_write()) {
1.11 markus 519: len = buffer_len(&stdin_buffer);
520: /* Keep the packets at reasonable size. */
521: if (len > packet_get_maxsize())
522: len = packet_get_maxsize();
523: packet_start(SSH_CMSG_STDIN_DATA);
524: packet_put_string(buffer_ptr(&stdin_buffer), len);
525: packet_send();
526: buffer_consume(&stdin_buffer, len);
527: /* If we have a pending EOF, send it now. */
528: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
529: packet_start(SSH_CMSG_EOF);
530: packet_send();
531: }
1.1 deraadt 532: }
533: }
534:
1.13 markus 535: /*
536: * Checks if the client window has changed, and sends a packet about it to
537: * the server if so. The actual change is detected elsewhere (by a software
538: * interrupt on Unix); this just checks the flag and sends a message if
539: * appropriate.
540: */
1.1 deraadt 541:
1.77 itojun 542: static void
1.49 itojun 543: client_check_window_change(void)
1.1 deraadt 544: {
1.16 markus 545: struct winsize ws;
546:
547: if (! received_window_change_signal)
548: return;
549: /** XXX race */
550: received_window_change_signal = 0;
551:
1.37 markus 552: debug2("client_check_window_change: changed");
1.16 markus 553:
554: if (compat20) {
1.123 djm 555: channel_send_window_changes();
1.16 markus 556: } else {
1.123 djm 557: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
558: return;
1.16 markus 559: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 560: packet_put_int((u_int)ws.ws_row);
561: packet_put_int((u_int)ws.ws_col);
562: packet_put_int((u_int)ws.ws_xpixel);
563: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 564: packet_send();
1.1 deraadt 565: }
566: }
567:
1.264 markus 568: static int
1.117 markus 569: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
570: {
1.196 djm 571: struct global_confirm *gc;
572:
573: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 574: return 0;
1.196 djm 575: if (gc->cb != NULL)
576: gc->cb(type, seq, gc->ctx);
577: if (--gc->ref_count <= 0) {
578: TAILQ_REMOVE(&global_confirms, gc, entry);
1.257 tedu 579: explicit_bzero(gc, sizeof(*gc));
1.250 djm 580: free(gc);
1.196 djm 581: }
582:
1.210 andreas 583: packet_set_alive_timeouts(0);
1.264 markus 584: return 0;
1.117 markus 585: }
586:
587: static void
588: server_alive_check(void)
589: {
1.210 andreas 590: if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
1.228 djm 591: logit("Timeout, server %s not responding.", host);
1.176 markus 592: cleanup_exit(255);
593: }
1.117 markus 594: packet_start(SSH2_MSG_GLOBAL_REQUEST);
595: packet_put_cstring("keepalive@openssh.com");
596: packet_put_char(1); /* boolean: want reply */
597: packet_send();
1.196 djm 598: /* Insert an empty placeholder to maintain ordering */
599: client_register_global_confirm(NULL, NULL);
1.117 markus 600: }
601:
1.13 markus 602: /*
603: * Waits until the client can do something (some data becomes available on
604: * one of the file descriptors).
605: */
1.77 itojun 606: static void
1.46 markus 607: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 608: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 609: {
1.117 markus 610: struct timeval tv, *tvp;
1.222 djm 611: int timeout_secs;
1.251 dtucker 612: time_t minwait_secs = 0, server_alive_time = 0, now = monotime();
1.117 markus 613: int ret;
614:
1.46 markus 615: /* Add any selections by the channel mechanism. */
1.239 djm 616: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp,
617: &minwait_secs, rekeying);
1.11 markus 618:
1.16 markus 619: if (!compat20) {
1.17 markus 620: /* Read from the connection, unless our buffers are full. */
1.16 markus 621: if (buffer_len(&stdout_buffer) < buffer_high &&
622: buffer_len(&stderr_buffer) < buffer_high &&
623: channel_not_very_much_buffered_data())
1.46 markus 624: FD_SET(connection_in, *readsetp);
1.17 markus 625: /*
626: * Read from stdin, unless we have seen EOF or have very much
627: * buffered data to send to the server.
628: */
629: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 630: FD_SET(fileno(stdin), *readsetp);
1.17 markus 631:
632: /* Select stdout/stderr if have data in buffer. */
633: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 634: FD_SET(fileno(stdout), *writesetp);
1.17 markus 635: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 636: FD_SET(fileno(stderr), *writesetp);
1.16 markus 637: } else {
1.71 markus 638: /* channel_prepare_select could have closed the last channel */
1.84 markus 639: if (session_closed && !channel_still_open() &&
640: !packet_have_data_to_write()) {
641: /* clear mask since we did not call select() */
1.87 markus 642: memset(*readsetp, 0, *nallocp);
643: memset(*writesetp, 0, *nallocp);
1.84 markus 644: return;
1.71 markus 645: } else {
646: FD_SET(connection_in, *readsetp);
647: }
1.16 markus 648: }
1.11 markus 649:
650: /* Select server connection if have data to write to the server. */
651: if (packet_have_data_to_write())
1.46 markus 652: FD_SET(connection_out, *writesetp);
1.11 markus 653:
1.13 markus 654: /*
655: * Wait for something to happen. This will suspend the process until
656: * some selected descriptor can be read, written, or has some other
1.222 djm 657: * event pending, or a timeout expires.
1.13 markus 658: */
1.11 markus 659:
1.222 djm 660: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.249 dtucker 661: if (options.server_alive_interval > 0 && compat20) {
1.222 djm 662: timeout_secs = options.server_alive_interval;
1.249 dtucker 663: server_alive_time = now + options.server_alive_interval;
664: }
665: if (options.rekey_interval > 0 && compat20 && !rekeying)
1.287 ! deraadt 666: timeout_secs = MINIMUM(timeout_secs, packet_get_rekey_timeout());
1.222 djm 667: set_control_persist_exit_time();
668: if (control_persist_exit_time > 0) {
1.287 ! deraadt 669: timeout_secs = MINIMUM(timeout_secs,
1.249 dtucker 670: control_persist_exit_time - now);
1.222 djm 671: if (timeout_secs < 0)
672: timeout_secs = 0;
673: }
1.239 djm 674: if (minwait_secs != 0)
1.287 ! deraadt 675: timeout_secs = MINIMUM(timeout_secs, (int)minwait_secs);
1.222 djm 676: if (timeout_secs == INT_MAX)
1.117 markus 677: tvp = NULL;
1.129 deraadt 678: else {
1.222 djm 679: tv.tv_sec = timeout_secs;
1.117 markus 680: tv.tv_usec = 0;
681: tvp = &tv;
682: }
1.222 djm 683:
1.117 markus 684: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
685: if (ret < 0) {
1.11 markus 686: char buf[100];
1.51 markus 687:
688: /*
689: * We have to clear the select masks, because we return.
690: * We have to return, because the mainloop checks for the flags
691: * set by the signal handlers.
692: */
1.87 markus 693: memset(*readsetp, 0, *nallocp);
694: memset(*writesetp, 0, *nallocp);
1.50 deraadt 695:
1.11 markus 696: if (errno == EINTR)
697: return;
698: /* Note: we might still have data in the buffers. */
699: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
700: buffer_append(&stderr_buffer, buf, strlen(buf));
701: quit_pending = 1;
1.249 dtucker 702: } else if (ret == 0) {
703: /*
704: * Timeout. Could have been either keepalive or rekeying.
705: * Keepalive we check here, rekeying is checked in clientloop.
706: */
1.251 dtucker 707: if (server_alive_time != 0 && server_alive_time <= monotime())
1.249 dtucker 708: server_alive_check();
709: }
710:
1.11 markus 711: }
712:
1.77 itojun 713: static void
1.31 markus 714: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 715: {
1.11 markus 716: /* Flush stdout and stderr buffers. */
1.31 markus 717: if (buffer_len(bout) > 0)
1.197 djm 718: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
719: buffer_len(bout));
1.31 markus 720: if (buffer_len(berr) > 0)
1.197 djm 721: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
722: buffer_len(berr));
1.11 markus 723:
1.233 djm 724: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 725:
1.13 markus 726: /*
727: * Free (and clear) the buffer to reduce the amount of data that gets
728: * written to swap.
729: */
1.31 markus 730: buffer_free(bin);
731: buffer_free(bout);
732: buffer_free(berr);
1.11 markus 733:
734: /* Send the suspend signal to the program itself. */
735: kill(getpid(), SIGTSTP);
736:
1.132 djm 737: /* Reset window sizes in case they have changed */
738: received_window_change_signal = 1;
1.11 markus 739:
740: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 741: buffer_init(bin);
742: buffer_init(bout);
743: buffer_init(berr);
1.11 markus 744:
1.233 djm 745: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 746: }
747:
1.77 itojun 748: static void
1.161 deraadt 749: client_process_net_input(fd_set *readset)
1.11 markus 750: {
1.280 markus 751: int len;
1.17 markus 752: char buf[8192];
1.11 markus 753:
1.13 markus 754: /*
755: * Read input from the server, and add any such data to the buffer of
756: * the packet subsystem.
757: */
1.11 markus 758: if (FD_ISSET(connection_in, readset)) {
759: /* Read as much as possible. */
1.280 markus 760: len = read(connection_in, buf, sizeof(buf));
761: if (len == 0) {
1.197 djm 762: /*
763: * Received EOF. The remote host has closed the
764: * connection.
765: */
766: snprintf(buf, sizeof buf,
767: "Connection to %.300s closed by remote host.\r\n",
768: host);
1.1 deraadt 769: buffer_append(&stderr_buffer, buf, strlen(buf));
770: quit_pending = 1;
771: return;
1.11 markus 772: }
1.13 markus 773: /*
774: * There is a kernel bug on Solaris that causes select to
775: * sometimes wake up even though there is no data available.
776: */
1.53 millert 777: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 778: len = 0;
779:
780: if (len < 0) {
1.197 djm 781: /*
782: * An error has encountered. Perhaps there is a
783: * network problem.
784: */
785: snprintf(buf, sizeof buf,
786: "Read from remote host %.300s: %.100s\r\n",
787: host, strerror(errno));
1.11 markus 788: buffer_append(&stderr_buffer, buf, strlen(buf));
789: quit_pending = 1;
790: return;
791: }
792: packet_process_incoming(buf, len);
793: }
1.17 markus 794: }
1.16 markus 795:
1.97 jakob 796: static void
1.190 djm 797: client_status_confirm(int type, Channel *c, void *ctx)
1.123 djm 798: {
1.190 djm 799: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
800: char errmsg[256];
801: int tochan;
802:
1.234 djm 803: /*
804: * If a TTY was explicitly requested, then a failure to allocate
805: * one is fatal.
806: */
807: if (cr->action == CONFIRM_TTY &&
808: (options.request_tty == REQUEST_TTY_FORCE ||
809: options.request_tty == REQUEST_TTY_YES))
810: cr->action = CONFIRM_CLOSE;
811:
1.190 djm 812: /* XXX supress on mux _client_ quietmode */
813: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 814: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 815:
816: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
817: debug2("%s request accepted on channel %d",
818: cr->request_type, c->self);
819: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
820: if (tochan) {
821: snprintf(errmsg, sizeof(errmsg),
822: "%s request failed\r\n", cr->request_type);
823: } else {
824: snprintf(errmsg, sizeof(errmsg),
825: "%s request failed on channel %d",
826: cr->request_type, c->self);
827: }
828: /* If error occurred on primary session channel, then exit */
1.234 djm 829: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 830: fatal("%s", errmsg);
1.234 djm 831: /*
832: * If error occurred on mux client, append to
833: * their stderr.
834: */
835: if (tochan) {
836: buffer_append(&c->extended, errmsg,
837: strlen(errmsg));
838: } else
1.190 djm 839: error("%s", errmsg);
1.234 djm 840: if (cr->action == CONFIRM_TTY) {
841: /*
842: * If a TTY allocation error occurred, then arrange
843: * for the correct TTY to leave raw mode.
844: */
845: if (c->self == session_ident)
846: leave_raw_mode(0);
847: else
848: mux_tty_alloc_failed(c);
849: } else if (cr->action == CONFIRM_CLOSE) {
1.190 djm 850: chan_read_failed(c);
851: chan_write_failed(c);
852: }
853: }
1.250 djm 854: free(cr);
1.190 djm 855: }
856:
857: static void
858: client_abandon_status_confirm(Channel *c, void *ctx)
859: {
1.250 djm 860: free(ctx);
1.190 djm 861: }
1.129 deraadt 862:
1.236 djm 863: void
1.234 djm 864: client_expect_confirm(int id, const char *request,
865: enum confirm_action action)
1.190 djm 866: {
1.255 djm 867: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 868:
1.190 djm 869: cr->request_type = request;
1.234 djm 870: cr->action = action;
1.123 djm 871:
1.190 djm 872: channel_register_status_confirm(id, client_status_confirm,
873: client_abandon_status_confirm, cr);
1.196 djm 874: }
875:
876: void
877: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
878: {
1.201 djm 879: struct global_confirm *gc, *last_gc;
1.196 djm 880:
881: /* Coalesce identical callbacks */
1.201 djm 882: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
883: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
884: if (++last_gc->ref_count >= INT_MAX)
885: fatal("%s: last_gc->ref_count = %d",
886: __func__, last_gc->ref_count);
1.196 djm 887: return;
888: }
889:
1.255 djm 890: gc = xcalloc(1, sizeof(*gc));
1.196 djm 891: gc->cb = cb;
892: gc->ctx = ctx;
893: gc->ref_count = 1;
894: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 895: }
896:
897: static void
1.99 markus 898: process_cmdline(void)
1.97 jakob 899: {
900: void (*handler)(int);
1.261 millert 901: char *s, *cmd;
902: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
903: struct Forward fwd;
1.97 jakob 904:
1.257 tedu 905: memset(&fwd, 0, sizeof(fwd));
1.183 djm 906:
1.233 djm 907: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 908: handler = signal(SIGINT, SIG_IGN);
1.99 markus 909: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 910: if (s == NULL)
911: goto out;
1.256 deraadt 912: while (isspace((u_char)*s))
1.97 jakob 913: s++;
1.121 djm 914: if (*s == '-')
915: s++; /* Skip cmdline '-', if any */
1.120 dtucker 916: if (*s == '\0')
1.97 jakob 917: goto out;
1.121 djm 918:
1.122 djm 919: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 920: logit("Commands:");
1.164 djm 921: logit(" -L[bind_address:]port:host:hostport "
922: "Request local forward");
923: logit(" -R[bind_address:]port:host:hostport "
924: "Request remote forward");
1.204 stevesk 925: logit(" -D[bind_address:]port "
926: "Request dynamic forward");
1.237 markus 927: logit(" -KL[bind_address:]port "
928: "Cancel local forward");
1.165 stevesk 929: logit(" -KR[bind_address:]port "
1.164 djm 930: "Cancel remote forward");
1.237 markus 931: logit(" -KD[bind_address:]port "
932: "Cancel dynamic forward");
1.146 reyk 933: if (!options.permit_local_command)
934: goto out;
1.164 djm 935: logit(" !args "
936: "Execute local command");
1.146 reyk 937: goto out;
938: }
939:
940: if (*s == '!' && options.permit_local_command) {
941: s++;
942: ssh_local_cmd(s);
1.121 djm 943: goto out;
944: }
945:
946: if (*s == 'K') {
947: delete = 1;
948: s++;
949: }
1.204 stevesk 950: if (*s == 'L')
951: local = 1;
952: else if (*s == 'R')
953: remote = 1;
954: else if (*s == 'D')
955: dynamic = 1;
956: else {
1.109 itojun 957: logit("Invalid command.");
1.97 jakob 958: goto out;
959: }
1.204 stevesk 960:
1.237 markus 961: if (delete && !compat20) {
1.109 itojun 962: logit("Not supported for SSH protocol version 1.");
1.97 jakob 963: goto out;
964: }
1.121 djm 965:
1.256 deraadt 966: while (isspace((u_char)*++s))
1.179 tedu 967: ;
1.97 jakob 968:
1.217 djm 969: /* XXX update list of forwards in options */
1.121 djm 970: if (delete) {
1.261 millert 971: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
972: if (!parse_forward(&fwd, s, 1, 0)) {
973: logit("Bad forwarding close specification.");
1.121 djm 974: goto out;
975: }
1.237 markus 976: if (remote)
1.261 millert 977: ok = channel_request_rforward_cancel(&fwd) == 0;
1.237 markus 978: else if (dynamic)
1.261 millert 979: ok = channel_cancel_lport_listener(&fwd,
980: 0, &options.fwd_opts) > 0;
1.237 markus 981: else
1.261 millert 982: ok = channel_cancel_lport_listener(&fwd,
983: CHANNEL_CANCEL_PORT_STATIC,
984: &options.fwd_opts) > 0;
1.237 markus 985: if (!ok) {
986: logit("Unkown port forwarding.");
987: goto out;
988: }
989: logit("Canceled forwarding.");
1.121 djm 990: } else {
1.209 djm 991: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 992: logit("Bad forwarding specification.");
993: goto out;
994: }
1.204 stevesk 995: if (local || dynamic) {
1.261 millert 996: if (!channel_setup_local_fwd_listener(&fwd,
997: &options.fwd_opts)) {
1.121 djm 998: logit("Port forwarding failed.");
999: goto out;
1000: }
1.135 djm 1001: } else {
1.261 millert 1002: if (channel_request_remote_forwarding(&fwd) < 0) {
1.167 markus 1003: logit("Port forwarding failed.");
1004: goto out;
1005: }
1.135 djm 1006: }
1.121 djm 1007: logit("Forwarding port.");
1008: }
1009:
1.97 jakob 1010: out:
1011: signal(SIGINT, handler);
1.233 djm 1012: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 1013: free(cmd);
1014: free(fwd.listen_host);
1.261 millert 1015: free(fwd.listen_path);
1.250 djm 1016: free(fwd.connect_host);
1.261 millert 1017: free(fwd.connect_path);
1.97 jakob 1018: }
1019:
1.244 dtucker 1020: /* reasons to suppress output of an escape command in help output */
1021: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1022: #define SUPPRESS_PROTO1 1 /* don't show in protocol 1 sessions */
1023: #define SUPPRESS_MUXCLIENT 2 /* don't show in mux client sessions */
1024: #define SUPPRESS_MUXMASTER 4 /* don't show in mux master sessions */
1025: #define SUPPRESS_SYSLOG 8 /* don't show when logging to syslog */
1026: struct escape_help_text {
1027: const char *cmd;
1028: const char *text;
1029: unsigned int flags;
1030: };
1031: static struct escape_help_text esc_txt[] = {
1032: {".", "terminate session", SUPPRESS_MUXMASTER},
1033: {".", "terminate connection (and any multiplexed sessions)",
1034: SUPPRESS_MUXCLIENT},
1035: {"B", "send a BREAK to the remote system", SUPPRESS_PROTO1},
1036: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1037: {"R", "request rekey", SUPPRESS_PROTO1},
1.246 dtucker 1038: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 1039: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
1040: {"#", "list forwarded connections", SUPPRESS_NEVER},
1041: {"&", "background ssh (when waiting for connections to terminate)",
1042: SUPPRESS_MUXCLIENT},
1043: {"?", "this message", SUPPRESS_NEVER},
1044: };
1045:
1046: static void
1047: print_escape_help(Buffer *b, int escape_char, int protocol2, int mux_client,
1048: int using_stderr)
1049: {
1050: unsigned int i, suppress_flags;
1051: char string[1024];
1052:
1053: snprintf(string, sizeof string, "%c?\r\n"
1054: "Supported escape sequences:\r\n", escape_char);
1055: buffer_append(b, string, strlen(string));
1056:
1057: suppress_flags = (protocol2 ? 0 : SUPPRESS_PROTO1) |
1058: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
1059: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
1060: (using_stderr ? 0 : SUPPRESS_SYSLOG);
1061:
1062: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
1063: if (esc_txt[i].flags & suppress_flags)
1064: continue;
1.246 dtucker 1065: snprintf(string, sizeof string, " %c%-3s - %s\r\n",
1.244 dtucker 1066: escape_char, esc_txt[i].cmd, esc_txt[i].text);
1067: buffer_append(b, string, strlen(string));
1068: }
1069:
1070: snprintf(string, sizeof string,
1.246 dtucker 1071: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 1072: "(Note that escapes are only recognized immediately after "
1073: "newline.)\r\n", escape_char, escape_char);
1074: buffer_append(b, string, strlen(string));
1075: }
1076:
1.195 djm 1077: /*
1078: * Process the characters one by one, call with c==NULL for proto1 case.
1079: */
1.77 itojun 1080: static int
1.195 djm 1081: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
1082: char *buf, int len)
1.31 markus 1083: {
1.32 markus 1084: char string[1024];
1.31 markus 1085: pid_t pid;
1086: int bytes = 0;
1.42 markus 1087: u_int i;
1088: u_char ch;
1.31 markus 1089: char *s;
1.195 djm 1090: int *escape_pendingp, escape_char;
1091: struct escape_filter_ctx *efc;
1.31 markus 1092:
1.195 djm 1093: if (c == NULL) {
1094: escape_pendingp = &escape_pending1;
1095: escape_char = escape_char1;
1096: } else {
1097: if (c->filter_ctx == NULL)
1098: return 0;
1099: efc = (struct escape_filter_ctx *)c->filter_ctx;
1100: escape_pendingp = &efc->escape_pending;
1101: escape_char = efc->escape_char;
1102: }
1103:
1.139 djm 1104: if (len <= 0)
1105: return (0);
1106:
1107: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1108: /* Get one character at a time. */
1109: ch = buf[i];
1110:
1.195 djm 1111: if (*escape_pendingp) {
1.31 markus 1112: /* We have previously seen an escape character. */
1113: /* Clear the flag now. */
1.195 djm 1114: *escape_pendingp = 0;
1.31 markus 1115:
1116: /* Process the escaped character. */
1117: switch (ch) {
1118: case '.':
1119: /* Terminate the connection. */
1.195 djm 1120: snprintf(string, sizeof string, "%c.\r\n",
1121: escape_char);
1.32 markus 1122: buffer_append(berr, string, strlen(string));
1.31 markus 1123:
1.217 djm 1124: if (c && c->ctl_chan != -1) {
1.195 djm 1125: chan_read_failed(c);
1126: chan_write_failed(c);
1.252 dtucker 1127: if (c->detach_user)
1128: c->detach_user(c->self, NULL);
1.253 dtucker 1129: c->type = SSH_CHANNEL_ABANDONED;
1130: buffer_clear(&c->input);
1131: chan_ibuf_empty(c);
1.195 djm 1132: return 0;
1133: } else
1134: quit_pending = 1;
1.31 markus 1135: return -1;
1136:
1137: case 'Z' - 64:
1.195 djm 1138: /* XXX support this for mux clients */
1.217 djm 1139: if (c && c->ctl_chan != -1) {
1.245 dtucker 1140: char b[16];
1.195 djm 1141: noescape:
1.245 dtucker 1142: if (ch == 'Z' - 64)
1143: snprintf(b, sizeof b, "^Z");
1144: else
1145: snprintf(b, sizeof b, "%c", ch);
1.195 djm 1146: snprintf(string, sizeof string,
1.245 dtucker 1147: "%c%s escape not available to "
1.195 djm 1148: "multiplexed sessions\r\n",
1.245 dtucker 1149: escape_char, b);
1.195 djm 1150: buffer_append(berr, string,
1151: strlen(string));
1152: continue;
1153: }
1.197 djm 1154: /* Suspend the program. Inform the user */
1.195 djm 1155: snprintf(string, sizeof string,
1156: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 1157: buffer_append(berr, string, strlen(string));
1.31 markus 1158:
1159: /* Restore terminal modes and suspend. */
1160: client_suspend_self(bin, bout, berr);
1161:
1162: /* We have been continued. */
1163: continue;
1164:
1.111 markus 1165: case 'B':
1166: if (compat20) {
1167: snprintf(string, sizeof string,
1168: "%cB\r\n", escape_char);
1169: buffer_append(berr, string,
1170: strlen(string));
1.254 djm 1171: channel_request_start(c->self,
1.111 markus 1172: "break", 0);
1173: packet_put_int(1000);
1174: packet_send();
1175: }
1176: continue;
1177:
1.54 markus 1178: case 'R':
1.59 markus 1179: if (compat20) {
1180: if (datafellows & SSH_BUG_NOREKEY)
1.197 djm 1181: logit("Server does not "
1182: "support re-keying");
1.59 markus 1183: else
1184: need_rekeying = 1;
1185: }
1.54 markus 1186: continue;
1187:
1.242 dtucker 1188: case 'V':
1189: /* FALLTHROUGH */
1190: case 'v':
1191: if (c && c->ctl_chan != -1)
1192: goto noescape;
1193: if (!log_is_on_stderr()) {
1194: snprintf(string, sizeof string,
1195: "%c%c [Logging to syslog]\r\n",
1196: escape_char, ch);
1197: buffer_append(berr, string,
1198: strlen(string));
1199: continue;
1200: }
1201: if (ch == 'V' && options.log_level >
1202: SYSLOG_LEVEL_QUIET)
1203: log_change_level(--options.log_level);
1204: if (ch == 'v' && options.log_level <
1205: SYSLOG_LEVEL_DEBUG3)
1206: log_change_level(++options.log_level);
1207: snprintf(string, sizeof string,
1208: "%c%c [LogLevel %s]\r\n", escape_char, ch,
1209: log_level_name(options.log_level));
1210: buffer_append(berr, string, strlen(string));
1211: continue;
1212:
1.31 markus 1213: case '&':
1.217 djm 1214: if (c && c->ctl_chan != -1)
1.195 djm 1215: goto noescape;
1.31 markus 1216: /*
1.197 djm 1217: * Detach the program (continue to serve
1218: * connections, but put in background and no
1219: * more new connections).
1.31 markus 1220: */
1221: /* Restore tty modes. */
1.233 djm 1222: leave_raw_mode(
1223: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1224:
1225: /* Stop listening for new connections. */
1.86 markus 1226: channel_stop_listening();
1.31 markus 1227:
1.86 markus 1228: snprintf(string, sizeof string,
1229: "%c& [backgrounded]\n", escape_char);
1230: buffer_append(berr, string, strlen(string));
1.31 markus 1231:
1232: /* Fork into background. */
1233: pid = fork();
1234: if (pid < 0) {
1235: error("fork: %.100s", strerror(errno));
1236: continue;
1237: }
1238: if (pid != 0) { /* This is the parent. */
1239: /* The parent just exits. */
1240: exit(0);
1241: }
1242: /* The child continues serving connections. */
1.86 markus 1243: if (compat20) {
1244: buffer_append(bin, "\004", 1);
1245: /* fake EOF on stdin */
1246: return -1;
1247: } else if (!stdin_eof) {
1248: /*
1.197 djm 1249: * Sending SSH_CMSG_EOF alone does not
1250: * always appear to be enough. So we
1251: * try to send an EOF character first.
1.86 markus 1252: */
1253: packet_start(SSH_CMSG_STDIN_DATA);
1254: packet_put_string("\004", 1);
1255: packet_send();
1256: /* Close stdin. */
1257: stdin_eof = 1;
1258: if (buffer_len(bin) == 0) {
1259: packet_start(SSH_CMSG_EOF);
1260: packet_send();
1261: }
1262: }
1263: continue;
1.31 markus 1264:
1265: case '?':
1.244 dtucker 1266: print_escape_help(berr, escape_char, compat20,
1267: (c && c->ctl_chan != -1),
1268: log_is_on_stderr());
1.31 markus 1269: continue;
1270:
1271: case '#':
1.195 djm 1272: snprintf(string, sizeof string, "%c#\r\n",
1273: escape_char);
1.32 markus 1274: buffer_append(berr, string, strlen(string));
1.31 markus 1275: s = channel_open_message();
1276: buffer_append(berr, s, strlen(s));
1.250 djm 1277: free(s);
1.97 jakob 1278: continue;
1279:
1280: case 'C':
1.217 djm 1281: if (c && c->ctl_chan != -1)
1.206 djm 1282: goto noescape;
1.99 markus 1283: process_cmdline();
1.31 markus 1284: continue;
1285:
1286: default:
1287: if (ch != escape_char) {
1288: buffer_put_char(bin, escape_char);
1289: bytes++;
1290: }
1291: /* Escaped characters fall through here */
1292: break;
1293: }
1294: } else {
1295: /*
1.197 djm 1296: * The previous character was not an escape char.
1297: * Check if this is an escape.
1.31 markus 1298: */
1299: if (last_was_cr && ch == escape_char) {
1.197 djm 1300: /*
1301: * It is. Set the flag and continue to
1302: * next character.
1303: */
1.195 djm 1304: *escape_pendingp = 1;
1.31 markus 1305: continue;
1306: }
1307: }
1308:
1309: /*
1310: * Normal character. Record whether it was a newline,
1311: * and append it to the buffer.
1312: */
1313: last_was_cr = (ch == '\r' || ch == '\n');
1314: buffer_put_char(bin, ch);
1315: bytes++;
1316: }
1317: return bytes;
1318: }
1319:
1.77 itojun 1320: static void
1.161 deraadt 1321: client_process_input(fd_set *readset)
1.17 markus 1322: {
1.21 deraadt 1323: int len;
1.31 markus 1324: char buf[8192];
1.16 markus 1325:
1.11 markus 1326: /* Read input from stdin. */
1327: if (FD_ISSET(fileno(stdin), readset)) {
1328: /* Read as much as possible. */
1329: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1330: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1331: return; /* we'll try again later */
1.11 markus 1332: if (len <= 0) {
1.13 markus 1333: /*
1334: * Received EOF or error. They are treated
1335: * similarly, except that an error message is printed
1336: * if it was an error condition.
1337: */
1.11 markus 1338: if (len < 0) {
1.197 djm 1339: snprintf(buf, sizeof buf, "read: %.100s\r\n",
1340: strerror(errno));
1.11 markus 1341: buffer_append(&stderr_buffer, buf, strlen(buf));
1342: }
1343: /* Mark that we have seen EOF. */
1344: stdin_eof = 1;
1.13 markus 1345: /*
1346: * Send an EOF message to the server unless there is
1347: * data in the buffer. If there is data in the
1348: * buffer, no message will be sent now. Code
1349: * elsewhere will send the EOF when the buffer
1350: * becomes empty if stdin_eof is set.
1351: */
1.11 markus 1352: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1353: packet_start(SSH_CMSG_EOF);
1354: packet_send();
1.11 markus 1355: }
1.195 djm 1356: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1357: /*
1358: * Normal successful read, and no escape character.
1359: * Just append the data to buffer.
1360: */
1.11 markus 1361: buffer_append(&stdin_buffer, buf, len);
1362: } else {
1.13 markus 1363: /*
1.197 djm 1364: * Normal, successful read. But we have an escape
1365: * character and have to process the characters one
1366: * by one.
1.13 markus 1367: */
1.195 djm 1368: if (process_escapes(NULL, &stdin_buffer,
1369: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1370: return;
1.11 markus 1371: }
1372: }
1373: }
1374:
1.77 itojun 1375: static void
1.161 deraadt 1376: client_process_output(fd_set *writeset)
1.11 markus 1377: {
1378: int len;
1379: char buf[100];
1.1 deraadt 1380:
1.11 markus 1381: /* Write buffered output to stdout. */
1382: if (FD_ISSET(fileno(stdout), writeset)) {
1383: /* Write as much data as possible. */
1384: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1385: buffer_len(&stdout_buffer));
1.11 markus 1386: if (len <= 0) {
1.64 markus 1387: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1388: len = 0;
1389: else {
1.13 markus 1390: /*
1391: * An error or EOF was encountered. Put an
1392: * error message to stderr buffer.
1393: */
1.197 djm 1394: snprintf(buf, sizeof buf,
1395: "write stdout: %.50s\r\n", strerror(errno));
1.11 markus 1396: buffer_append(&stderr_buffer, buf, strlen(buf));
1397: quit_pending = 1;
1398: return;
1399: }
1400: }
1401: /* Consume printed data from the buffer. */
1402: buffer_consume(&stdout_buffer, len);
1403: }
1404: /* Write buffered output to stderr. */
1405: if (FD_ISSET(fileno(stderr), writeset)) {
1406: /* Write as much data as possible. */
1407: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1408: buffer_len(&stderr_buffer));
1.11 markus 1409: if (len <= 0) {
1.64 markus 1410: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1411: len = 0;
1412: else {
1.197 djm 1413: /*
1414: * EOF or error, but can't even print
1415: * error message.
1416: */
1.11 markus 1417: quit_pending = 1;
1418: return;
1419: }
1420: }
1421: /* Consume printed characters from the buffer. */
1422: buffer_consume(&stderr_buffer, len);
1423: }
1.1 deraadt 1424: }
1425:
1.13 markus 1426: /*
1.15 markus 1427: * Get packets from the connection input buffer, and process them as long as
1428: * there are packets available.
1429: *
1430: * Any unknown packets received during the actual
1431: * session cause the session to terminate. This is
1432: * intended to make debugging easier since no
1433: * confirmations are sent. Any compatible protocol
1434: * extensions must be negotiated during the
1435: * preparatory phase.
1436: */
1437:
1.77 itojun 1438: static void
1.49 itojun 1439: client_process_buffered_input_packets(void)
1.15 markus 1440: {
1.265 markus 1441: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, active_state);
1.15 markus 1442: }
1443:
1.31 markus 1444: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1445:
1.195 djm 1446: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1447: void *
1448: client_new_escape_filter_ctx(int escape_char)
1449: {
1450: struct escape_filter_ctx *ret;
1451:
1.255 djm 1452: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1453: ret->escape_pending = 0;
1454: ret->escape_char = escape_char;
1455: return (void *)ret;
1456: }
1457:
1.198 djm 1458: /* Free the escape filter context on channel free */
1459: void
1460: client_filter_cleanup(int cid, void *ctx)
1461: {
1.250 djm 1462: free(ctx);
1.198 djm 1463: }
1464:
1.195 djm 1465: int
1466: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1467: {
1.190 djm 1468: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1469: return 0;
1470:
1.195 djm 1471: return process_escapes(c, &c->input, &c->output, &c->extended,
1472: buf, len);
1.30 markus 1473: }
1474:
1.77 itojun 1475: static void
1.60 markus 1476: client_channel_closed(int id, void *arg)
1477: {
1.83 markus 1478: channel_cancel_cleanup(id);
1.60 markus 1479: session_closed = 1;
1.233 djm 1480: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1481: }
1482:
1.15 markus 1483: /*
1.13 markus 1484: * Implements the interactive session with the server. This is called after
1485: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1486: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1487: * used as an escape character for terminating or suspending the session.
1.13 markus 1488: */
1.1 deraadt 1489:
1.20 markus 1490: int
1.30 markus 1491: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1492: {
1.46 markus 1493: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1494: double start_time, total_time;
1.284 djm 1495: int r, max_fd = 0, max_fd2 = 0, len;
1.200 markus 1496: u_int64_t ibytes, obytes;
1.130 avsm 1497: u_int nalloc = 0;
1.11 markus 1498: char buf[100];
1499:
1500: debug("Entering interactive session.");
1.277 semarie 1501:
1.278 semarie 1502: if (options.control_master &&
1.286 djm 1503: !option_clear_or_none(options.control_path)) {
1.278 semarie 1504: debug("pledge: id");
1.285 tb 1505: if (pledge("stdio rpath wpath cpath unix inet dns recvfd proc exec id tty",
1.278 semarie 1506: NULL) == -1)
1507: fatal("%s pledge(): %s", __func__, strerror(errno));
1508:
1509: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1510: debug("pledge: exec");
1511: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1512: NULL) == -1)
1513: fatal("%s pledge(): %s", __func__, strerror(errno));
1514:
1515: } else if (options.update_hostkeys) {
1516: debug("pledge: filesystem full");
1517: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1518: NULL) == -1)
1519: fatal("%s pledge(): %s", __func__, strerror(errno));
1520:
1.286 djm 1521: } else if (!option_clear_or_none(options.proxy_command) ||
1522: fork_after_authentication_flag) {
1.277 semarie 1523: debug("pledge: proc");
1524: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1525: fatal("%s pledge(): %s", __func__, strerror(errno));
1526:
1527: } else {
1528: debug("pledge: network");
1529: if (pledge("stdio unix inet dns tty", NULL) == -1)
1530: fatal("%s pledge(): %s", __func__, strerror(errno));
1531: }
1.11 markus 1532:
1533: start_time = get_current_time();
1534:
1535: /* Initialize variables. */
1.195 djm 1536: escape_pending1 = 0;
1.11 markus 1537: last_was_cr = 1;
1538: exit_status = -1;
1539: stdin_eof = 0;
1540: buffer_high = 64 * 1024;
1541: connection_in = packet_get_connection_in();
1542: connection_out = packet_get_connection_out();
1.287 ! deraadt 1543: max_fd = MAXIMUM(connection_in, connection_out);
1.46 markus 1544:
1545: if (!compat20) {
1.63 markus 1546: /* enable nonblocking unless tty */
1547: if (!isatty(fileno(stdin)))
1548: set_nonblock(fileno(stdin));
1549: if (!isatty(fileno(stdout)))
1550: set_nonblock(fileno(stdout));
1551: if (!isatty(fileno(stderr)))
1552: set_nonblock(fileno(stderr));
1.287 ! deraadt 1553: max_fd = MAXIMUM(max_fd, fileno(stdin));
! 1554: max_fd = MAXIMUM(max_fd, fileno(stdout));
! 1555: max_fd = MAXIMUM(max_fd, fileno(stderr));
1.46 markus 1556: }
1.11 markus 1557: quit_pending = 0;
1.195 djm 1558: escape_char1 = escape_char_arg;
1.11 markus 1559:
1560: /* Initialize buffers. */
1561: buffer_init(&stdin_buffer);
1562: buffer_init(&stdout_buffer);
1563: buffer_init(&stderr_buffer);
1564:
1.15 markus 1565: client_init_dispatch();
1566:
1.105 markus 1567: /*
1568: * Set signal handlers, (e.g. to restore non-blocking mode)
1569: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1570: */
1.131 djm 1571: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1572: signal(SIGHUP, signal_handler);
1.105 markus 1573: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1574: signal(SIGINT, signal_handler);
1575: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1576: signal(SIGQUIT, signal_handler);
1577: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1578: signal(SIGTERM, signal_handler);
1.132 djm 1579: signal(SIGWINCH, window_change_handler);
1.11 markus 1580:
1581: if (have_pty)
1.233 djm 1582: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1583:
1.48 markus 1584: if (compat20) {
1585: session_ident = ssh2_chan_id;
1.232 djm 1586: if (session_ident != -1) {
1587: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1588: channel_register_filter(session_ident,
1589: client_simple_escape_filter, NULL,
1590: client_filter_cleanup,
1591: client_new_escape_filter_ctx(
1592: escape_char_arg));
1593: }
1.60 markus 1594: channel_register_cleanup(session_ident,
1.143 djm 1595: client_channel_closed, 0);
1.232 djm 1596: }
1.48 markus 1597: } else {
1598: /* Check if we should immediately send eof on stdin. */
1.16 markus 1599: client_check_initial_eof_on_stdin();
1.48 markus 1600: }
1.30 markus 1601:
1.11 markus 1602: /* Main loop of the client for the interactive session mode. */
1603: while (!quit_pending) {
1604:
1.13 markus 1605: /* Process buffered packets sent by the server. */
1.11 markus 1606: client_process_buffered_input_packets();
1607:
1.60 markus 1608: if (compat20 && session_closed && !channel_still_open())
1609: break;
1610:
1.284 djm 1611: if (ssh_packet_is_rekeying(active_state)) {
1.56 markus 1612: debug("rekeying in progress");
1.284 djm 1613: } else if (need_rekeying) {
1614: /* manual rekey request */
1615: debug("need rekeying");
1616: if ((r = kex_start_rekex(active_state)) != 0)
1617: fatal("%s: kex_start_rekex: %s", __func__,
1618: ssh_err(r));
1619: need_rekeying = 0;
1.56 markus 1620: } else {
1621: /*
1622: * Make packets of buffered stdin data, and buffer
1623: * them for sending to the server.
1624: */
1625: if (!compat20)
1626: client_make_packets_from_stdin_data();
1.11 markus 1627:
1.56 markus 1628: /*
1629: * Make packets from buffered channel data, and
1630: * enqueue them for sending to the server.
1631: */
1632: if (packet_not_very_much_data_to_write())
1633: channel_output_poll();
1.11 markus 1634:
1.56 markus 1635: /*
1636: * Check if the window size has changed, and buffer a
1637: * message about it to the server if so.
1638: */
1639: client_check_window_change();
1.11 markus 1640:
1.56 markus 1641: if (quit_pending)
1642: break;
1643: }
1.13 markus 1644: /*
1645: * Wait until we have something to do (something becomes
1646: * available on one of the descriptors).
1647: */
1.81 markus 1648: max_fd2 = max_fd;
1.56 markus 1649: client_wait_until_can_do_something(&readset, &writeset,
1.284 djm 1650: &max_fd2, &nalloc, ssh_packet_is_rekeying(active_state));
1.11 markus 1651:
1652: if (quit_pending)
1653: break;
1654:
1.56 markus 1655: /* Do channel operations unless rekeying in progress. */
1.284 djm 1656: if (!ssh_packet_is_rekeying(active_state))
1.56 markus 1657: channel_after_select(readset, writeset);
1.11 markus 1658:
1.17 markus 1659: /* Buffer input from the connection. */
1.46 markus 1660: client_process_net_input(readset);
1.17 markus 1661:
1662: if (quit_pending)
1663: break;
1.11 markus 1664:
1.17 markus 1665: if (!compat20) {
1666: /* Buffer data from stdin */
1.46 markus 1667: client_process_input(readset);
1.17 markus 1668: /*
1669: * Process output to stdout and stderr. Output to
1670: * the connection is processed elsewhere (above).
1671: */
1.46 markus 1672: client_process_output(writeset);
1.17 markus 1673: }
1.11 markus 1674:
1.197 djm 1675: /*
1676: * Send as much buffered packet data as possible to the
1677: * sender.
1678: */
1.46 markus 1679: if (FD_ISSET(connection_out, writeset))
1.11 markus 1680: packet_write_poll();
1.222 djm 1681:
1682: /*
1683: * If we are a backgrounded control master, and the
1684: * timeout has expired without any active client
1685: * connections, then quit.
1686: */
1687: if (control_persist_exit_time > 0) {
1.251 dtucker 1688: if (monotime() >= control_persist_exit_time) {
1.222 djm 1689: debug("ControlPersist timeout expired");
1690: break;
1691: }
1692: }
1.11 markus 1693: }
1.250 djm 1694: free(readset);
1695: free(writeset);
1.11 markus 1696:
1697: /* Terminate the session. */
1698:
1699: /* Stop watching for window change. */
1.132 djm 1700: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1701:
1.213 stevesk 1702: if (compat20) {
1703: packet_start(SSH2_MSG_DISCONNECT);
1704: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1705: packet_put_cstring("disconnected by user");
1.219 djm 1706: packet_put_cstring(""); /* language tag */
1.213 stevesk 1707: packet_send();
1708: packet_write_wait();
1709: }
1.11 markus 1710:
1.76 markus 1711: channel_free_all();
1.11 markus 1712:
1.75 markus 1713: if (have_pty)
1.233 djm 1714: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1715:
1716: /* restore blocking io */
1717: if (!isatty(fileno(stdin)))
1718: unset_nonblock(fileno(stdin));
1719: if (!isatty(fileno(stdout)))
1720: unset_nonblock(fileno(stdout));
1721: if (!isatty(fileno(stderr)))
1722: unset_nonblock(fileno(stderr));
1.116 dtucker 1723:
1724: /*
1725: * If there was no shell or command requested, there will be no remote
1726: * exit status to be returned. In that case, clear error code if the
1727: * connection was deliberately terminated at this end.
1728: */
1729: if (no_shell_flag && received_signal == SIGTERM) {
1730: received_signal = 0;
1731: exit_status = 0;
1732: }
1.75 markus 1733:
1.113 markus 1734: if (received_signal)
1.89 itojun 1735: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1736:
1.13 markus 1737: /*
1738: * In interactive mode (with pseudo tty) display a message indicating
1739: * that the connection has been closed.
1740: */
1.11 markus 1741: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1742: snprintf(buf, sizeof buf,
1743: "Connection to %.64s closed.\r\n", host);
1.11 markus 1744: buffer_append(&stderr_buffer, buf, strlen(buf));
1745: }
1.70 markus 1746:
1.11 markus 1747: /* Output any buffered data for stdout. */
1.231 djm 1748: if (buffer_len(&stdout_buffer) > 0) {
1.230 djm 1749: len = atomicio(vwrite, fileno(stdout),
1750: buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer));
1.231 djm 1751: if (len < 0 || (u_int)len != buffer_len(&stdout_buffer))
1.11 markus 1752: error("Write failed flushing stdout buffer.");
1.231 djm 1753: else
1754: buffer_consume(&stdout_buffer, len);
1.11 markus 1755: }
1756:
1757: /* Output any buffered data for stderr. */
1.231 djm 1758: if (buffer_len(&stderr_buffer) > 0) {
1.230 djm 1759: len = atomicio(vwrite, fileno(stderr),
1760: buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1.231 djm 1761: if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1.11 markus 1762: error("Write failed flushing stderr buffer.");
1.231 djm 1763: else
1764: buffer_consume(&stderr_buffer, len);
1.11 markus 1765: }
1766:
1767: /* Clear and free any buffers. */
1.281 jsg 1768: explicit_bzero(buf, sizeof(buf));
1.11 markus 1769: buffer_free(&stdin_buffer);
1770: buffer_free(&stdout_buffer);
1771: buffer_free(&stderr_buffer);
1772:
1773: /* Report bytes transferred, and transfer rates. */
1774: total_time = get_current_time() - start_time;
1.263 markus 1775: packet_get_bytes(&ibytes, &obytes);
1.200 markus 1776: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1777: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1778: if (total_time > 0)
1.200 markus 1779: verbose("Bytes per second: sent %.1f, received %.1f",
1780: obytes / total_time, ibytes / total_time);
1.11 markus 1781: /* Return the exit status of the program. */
1782: debug("Exit status %d", exit_status);
1783: return exit_status;
1.15 markus 1784: }
1785:
1786: /*********/
1787:
1.264 markus 1788: static int
1.94 markus 1789: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1790: {
1.42 markus 1791: u_int data_len;
1.15 markus 1792: char *data = packet_get_string(&data_len);
1.93 markus 1793: packet_check_eom();
1.15 markus 1794: buffer_append(&stdout_buffer, data, data_len);
1.258 djm 1795: explicit_bzero(data, data_len);
1.250 djm 1796: free(data);
1.264 markus 1797: return 0;
1.15 markus 1798: }
1.264 markus 1799: static int
1.94 markus 1800: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1801: {
1.42 markus 1802: u_int data_len;
1.15 markus 1803: char *data = packet_get_string(&data_len);
1.93 markus 1804: packet_check_eom();
1.15 markus 1805: buffer_append(&stderr_buffer, data, data_len);
1.258 djm 1806: explicit_bzero(data, data_len);
1.250 djm 1807: free(data);
1.264 markus 1808: return 0;
1.15 markus 1809: }
1.264 markus 1810: static int
1.94 markus 1811: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1812: {
1813: exit_status = packet_get_int();
1.93 markus 1814: packet_check_eom();
1.15 markus 1815: /* Acknowledge the exit. */
1816: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1817: packet_send();
1818: /*
1819: * Must wait for packet to be sent since we are
1820: * exiting the loop.
1821: */
1822: packet_write_wait();
1823: /* Flag that we want to exit. */
1824: quit_pending = 1;
1.264 markus 1825: return 0;
1.15 markus 1826: }
1.267 djm 1827:
1.264 markus 1828: static int
1.115 markus 1829: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1830: {
1831: Channel *c = NULL;
1.262 djm 1832: int r, remote_id, sock;
1.115 markus 1833:
1834: /* Read the remote channel number from the message. */
1835: remote_id = packet_get_int();
1836: packet_check_eom();
1837:
1838: /*
1839: * Get a connection to the local authentication agent (this may again
1840: * get forwarded).
1841: */
1.262 djm 1842: if ((r = ssh_get_authentication_socket(&sock)) != 0 &&
1843: r != SSH_ERR_AGENT_NOT_PRESENT)
1844: debug("%s: ssh_get_authentication_socket: %s",
1845: __func__, ssh_err(r));
1846:
1.115 markus 1847:
1848: /*
1849: * If we could not connect the agent, send an error message back to
1850: * the server. This should never happen unless the agent dies,
1851: * because authentication forwarding is only enabled if we have an
1852: * agent.
1853: */
1854: if (sock >= 0) {
1855: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1856: -1, 0, 0, 0, "authentication agent connection", 1);
1857: c->remote_id = remote_id;
1858: c->force_drain = 1;
1859: }
1860: if (c == NULL) {
1861: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1862: packet_put_int(remote_id);
1863: } else {
1864: /* Send a confirmation to the remote host. */
1865: debug("Forwarding authentication connection.");
1866: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1867: packet_put_int(remote_id);
1868: packet_put_int(c->self);
1869: }
1870: packet_send();
1.264 markus 1871: return 0;
1.115 markus 1872: }
1.15 markus 1873:
1.77 itojun 1874: static Channel *
1.40 markus 1875: client_request_forwarded_tcpip(const char *request_type, int rchan)
1876: {
1.103 deraadt 1877: Channel *c = NULL;
1.40 markus 1878: char *listen_address, *originator_address;
1.208 djm 1879: u_short listen_port, originator_port;
1.40 markus 1880:
1881: /* Get rest of the packet */
1882: listen_address = packet_get_string(NULL);
1883: listen_port = packet_get_int();
1884: originator_address = packet_get_string(NULL);
1885: originator_port = packet_get_int();
1.93 markus 1886: packet_check_eom();
1.40 markus 1887:
1.261 millert 1888: debug("%s: listen %s port %d, originator %s port %d", __func__,
1889: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1890:
1.260 markus 1891: c = channel_connect_by_listen_address(listen_address, listen_port,
1.191 djm 1892: "forwarded-tcpip", originator_address);
1.40 markus 1893:
1.250 djm 1894: free(originator_address);
1895: free(listen_address);
1.40 markus 1896: return c;
1897: }
1898:
1.103 deraadt 1899: static Channel *
1.261 millert 1900: client_request_forwarded_streamlocal(const char *request_type, int rchan)
1901: {
1902: Channel *c = NULL;
1903: char *listen_path;
1904:
1905: /* Get the remote path. */
1906: listen_path = packet_get_string(NULL);
1907: /* XXX: Skip reserved field for now. */
1908: if (packet_get_string_ptr(NULL) == NULL)
1909: fatal("%s: packet_get_string_ptr failed", __func__);
1910: packet_check_eom();
1911:
1912: debug("%s: %s", __func__, listen_path);
1913:
1914: c = channel_connect_by_listen_path(listen_path,
1915: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1916: free(listen_path);
1917: return c;
1918: }
1919:
1920: static Channel *
1.40 markus 1921: client_request_x11(const char *request_type, int rchan)
1922: {
1923: Channel *c = NULL;
1924: char *originator;
1.208 djm 1925: u_short originator_port;
1.67 markus 1926: int sock;
1.40 markus 1927:
1928: if (!options.forward_x11) {
1929: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1930: error("Warning: this is probably a break-in attempt by a "
1931: "malicious server.");
1.221 djm 1932: return NULL;
1933: }
1.274 djm 1934: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1935: verbose("Rejected X11 connection after ForwardX11Timeout "
1936: "expired");
1.40 markus 1937: return NULL;
1938: }
1939: originator = packet_get_string(NULL);
1940: if (datafellows & SSH_BUG_X11FWD) {
1941: debug2("buggy server: x11 request w/o originator_port");
1942: originator_port = 0;
1943: } else {
1944: originator_port = packet_get_int();
1945: }
1.93 markus 1946: packet_check_eom();
1.40 markus 1947: /* XXX check permission */
1.47 markus 1948: debug("client_request_x11: request from %s %d", originator,
1949: originator_port);
1.250 djm 1950: free(originator);
1.40 markus 1951: sock = x11_connect_display();
1.67 markus 1952: if (sock < 0)
1953: return NULL;
1954: c = channel_new("x11",
1955: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1956: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1957: c->force_drain = 1;
1.40 markus 1958: return c;
1959: }
1960:
1.103 deraadt 1961: static Channel *
1.40 markus 1962: client_request_agent(const char *request_type, int rchan)
1963: {
1964: Channel *c = NULL;
1.262 djm 1965: int r, sock;
1.40 markus 1966:
1967: if (!options.forward_agent) {
1968: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1969: error("Warning: this is probably a break-in attempt by a "
1970: "malicious server.");
1.40 markus 1971: return NULL;
1972: }
1.262 djm 1973: if ((r = ssh_get_authentication_socket(&sock)) != 0) {
1974: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1975: debug("%s: ssh_get_authentication_socket: %s",
1976: __func__, ssh_err(r));
1.67 markus 1977: return NULL;
1.262 djm 1978: }
1.67 markus 1979: c = channel_new("authentication agent connection",
1980: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1981: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1982: "authentication agent connection", 1);
1.82 markus 1983: c->force_drain = 1;
1.40 markus 1984: return c;
1.180 djm 1985: }
1986:
1987: int
1988: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1989: {
1990: Channel *c;
1991: int fd;
1992:
1993: if (tun_mode == SSH_TUNMODE_NO)
1994: return 0;
1995:
1996: if (!compat20) {
1.207 stevesk 1997: error("Tunnel forwarding is not supported for protocol 1");
1.180 djm 1998: return -1;
1999: }
2000:
2001: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
2002:
2003: /* Open local tunnel device */
2004: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
2005: error("Tunnel device open failed.");
2006: return -1;
2007: }
2008:
2009: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
2010: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
2011: c->datagram = 1;
2012:
2013: packet_start(SSH2_MSG_CHANNEL_OPEN);
2014: packet_put_cstring("tun@openssh.com");
2015: packet_put_int(c->self);
2016: packet_put_int(c->local_window_max);
2017: packet_put_int(c->local_maxpacket);
2018: packet_put_int(tun_mode);
2019: packet_put_int(remote_tun);
2020: packet_send();
2021:
2022: return 0;
1.40 markus 2023: }
2024:
1.22 markus 2025: /* XXXX move to generic input handler */
1.264 markus 2026: static int
1.94 markus 2027: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 2028: {
2029: Channel *c = NULL;
2030: char *ctype;
2031: int rchan;
1.102 markus 2032: u_int rmaxpack, rwindow, len;
1.22 markus 2033:
2034: ctype = packet_get_string(&len);
2035: rchan = packet_get_int();
2036: rwindow = packet_get_int();
2037: rmaxpack = packet_get_int();
2038:
1.24 markus 2039: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 2040: ctype, rchan, rwindow, rmaxpack);
2041:
1.40 markus 2042: if (strcmp(ctype, "forwarded-tcpip") == 0) {
2043: c = client_request_forwarded_tcpip(ctype, rchan);
1.261 millert 2044: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
2045: c = client_request_forwarded_streamlocal(ctype, rchan);
1.40 markus 2046: } else if (strcmp(ctype, "x11") == 0) {
2047: c = client_request_x11(ctype, rchan);
2048: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
2049: c = client_request_agent(ctype, rchan);
1.22 markus 2050: }
2051: /* XXX duplicate : */
2052: if (c != NULL) {
2053: debug("confirm %s", ctype);
2054: c->remote_id = rchan;
2055: c->remote_window = rwindow;
2056: c->remote_maxpacket = rmaxpack;
1.69 markus 2057: if (c->type != SSH_CHANNEL_CONNECTING) {
2058: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
2059: packet_put_int(c->remote_id);
2060: packet_put_int(c->self);
2061: packet_put_int(c->local_window);
2062: packet_put_int(c->local_maxpacket);
2063: packet_send();
2064: }
1.22 markus 2065: } else {
2066: debug("failure %s", ctype);
2067: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
2068: packet_put_int(rchan);
2069: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 2070: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 2071: packet_put_cstring("open failed");
1.66 markus 2072: packet_put_cstring("");
2073: }
1.22 markus 2074: packet_send();
2075: }
1.250 djm 2076: free(ctype);
1.264 markus 2077: return 0;
1.22 markus 2078: }
1.267 djm 2079:
1.264 markus 2080: static int
1.94 markus 2081: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 2082: {
2083: Channel *c = NULL;
1.123 djm 2084: int exitval, id, reply, success = 0;
1.48 markus 2085: char *rtype;
2086:
2087: id = packet_get_int();
2088: rtype = packet_get_string(NULL);
2089: reply = packet_get_char();
2090:
2091: debug("client_input_channel_req: channel %d rtype %s reply %d",
2092: id, rtype, reply);
2093:
1.128 djm 2094: if (id == -1) {
2095: error("client_input_channel_req: request for channel -1");
2096: } else if ((c = channel_lookup(id)) == NULL) {
1.197 djm 2097: error("client_input_channel_req: channel %d: "
2098: "unknown channel", id);
1.193 markus 2099: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
2100: packet_check_eom();
2101: chan_rcvd_eow(c);
1.48 markus 2102: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 2103: exitval = packet_get_int();
1.217 djm 2104: if (c->ctl_chan != -1) {
2105: mux_exit_message(c, exitval);
1.215 djm 2106: success = 1;
2107: } else if (id == session_ident) {
2108: /* Record exit value of local session */
1.123 djm 2109: success = 1;
2110: exit_status = exitval;
1.215 djm 2111: } else {
1.218 djm 2112: /* Probably for a mux channel that has already closed */
2113: debug("%s: no sink for exit-status on channel %d",
2114: __func__, id);
1.123 djm 2115: }
1.93 markus 2116: packet_check_eom();
1.48 markus 2117: }
1.259 djm 2118: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.48 markus 2119: packet_start(success ?
2120: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 2121: packet_put_int(c->remote_id);
1.48 markus 2122: packet_send();
2123: }
1.250 djm 2124: free(rtype);
1.264 markus 2125: return 0;
1.48 markus 2126: }
1.267 djm 2127:
1.269 djm 2128: struct hostkeys_update_ctx {
2129: /* The hostname and (optionally) IP address string for the server */
2130: char *host_str, *ip_str;
2131:
2132: /*
2133: * Keys received from the server and a flag for each indicating
2134: * whether they already exist in known_hosts.
2135: * keys_seen is filled in by hostkeys_find() and later (for new
2136: * keys) by client_global_hostkeys_private_confirm().
2137: */
2138: struct sshkey **keys;
2139: int *keys_seen;
2140: size_t nkeys;
2141:
2142: size_t nnew;
2143:
2144: /*
2145: * Keys that are in known_hosts, but were not present in the update
2146: * from the server (i.e. scheduled to be deleted).
2147: * Filled in by hostkeys_find().
2148: */
2149: struct sshkey **old_keys;
2150: size_t nold;
2151: };
2152:
2153: static void
2154: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
2155: {
2156: size_t i;
2157:
2158: if (ctx == NULL)
2159: return;
2160: for (i = 0; i < ctx->nkeys; i++)
2161: sshkey_free(ctx->keys[i]);
2162: free(ctx->keys);
2163: free(ctx->keys_seen);
2164: for (i = 0; i < ctx->nold; i++)
2165: sshkey_free(ctx->old_keys[i]);
2166: free(ctx->old_keys);
2167: free(ctx->host_str);
2168: free(ctx->ip_str);
2169: free(ctx);
2170: }
2171:
2172: static int
2173: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
2174: {
2175: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2176: size_t i;
2177: struct sshkey **tmp;
2178:
2179: if (l->status != HKF_STATUS_MATCHED || l->key == NULL ||
2180: l->key->type == KEY_RSA1)
2181: return 0;
2182:
2183: /* Mark off keys we've already seen for this host */
2184: for (i = 0; i < ctx->nkeys; i++) {
2185: if (sshkey_equal(l->key, ctx->keys[i])) {
2186: debug3("%s: found %s key at %s:%ld", __func__,
2187: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
2188: ctx->keys_seen[i] = 1;
2189: return 0;
2190: }
2191: }
2192: /* This line contained a key that not offered by the server */
2193: debug3("%s: deprecated %s key at %s:%ld", __func__,
2194: sshkey_ssh_name(l->key), l->path, l->linenum);
2195: if ((tmp = reallocarray(ctx->old_keys, ctx->nold + 1,
2196: sizeof(*ctx->old_keys))) == NULL)
2197: fatal("%s: reallocarray failed nold = %zu",
2198: __func__, ctx->nold);
2199: ctx->old_keys = tmp;
2200: ctx->old_keys[ctx->nold++] = l->key;
2201: l->key = NULL;
2202:
2203: return 0;
2204: }
2205:
2206: static void
2207: update_known_hosts(struct hostkeys_update_ctx *ctx)
2208: {
1.271 djm 2209: int r, was_raw = 0;
2210: int loglevel = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK ?
1.269 djm 2211: SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
2212: char *fp, *response;
2213: size_t i;
2214:
2215: for (i = 0; i < ctx->nkeys; i++) {
2216: if (ctx->keys_seen[i] != 2)
2217: continue;
2218: if ((fp = sshkey_fingerprint(ctx->keys[i],
2219: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2220: fatal("%s: sshkey_fingerprint failed", __func__);
2221: do_log2(loglevel, "Learned new hostkey: %s %s",
2222: sshkey_type(ctx->keys[i]), fp);
2223: free(fp);
2224: }
2225: for (i = 0; i < ctx->nold; i++) {
2226: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2227: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2228: fatal("%s: sshkey_fingerprint failed", __func__);
2229: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2230: sshkey_type(ctx->old_keys[i]), fp);
2231: free(fp);
2232: }
2233: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2234: if (get_saved_tio() != NULL) {
2235: leave_raw_mode(1);
2236: was_raw = 1;
2237: }
1.269 djm 2238: response = NULL;
2239: for (i = 0; !quit_pending && i < 3; i++) {
2240: free(response);
2241: response = read_passphrase("Accept updated hostkeys? "
2242: "(yes/no): ", RP_ECHO);
2243: if (strcasecmp(response, "yes") == 0)
2244: break;
2245: else if (quit_pending || response == NULL ||
2246: strcasecmp(response, "no") == 0) {
2247: options.update_hostkeys = 0;
2248: break;
2249: } else {
2250: do_log2(loglevel, "Please enter "
2251: "\"yes\" or \"no\"");
2252: }
2253: }
2254: if (quit_pending || i >= 3 || response == NULL)
2255: options.update_hostkeys = 0;
2256: free(response);
1.271 djm 2257: if (was_raw)
2258: enter_raw_mode(1);
1.269 djm 2259: }
2260:
2261: /*
2262: * Now that all the keys are verified, we can go ahead and replace
2263: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2264: * cancel the operation).
2265: */
2266: if (options.update_hostkeys != 0 &&
2267: (r = hostfile_replace_entries(options.user_hostfiles[0],
2268: ctx->host_str, ctx->ip_str, ctx->keys, ctx->nkeys,
2269: options.hash_known_hosts, 0,
2270: options.fingerprint_hash)) != 0)
2271: error("%s: hostfile_replace_entries failed: %s",
2272: __func__, ssh_err(r));
2273: }
2274:
2275: static void
2276: client_global_hostkeys_private_confirm(int type, u_int32_t seq, void *_ctx)
2277: {
2278: struct ssh *ssh = active_state; /* XXX */
2279: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2280: size_t i, ndone;
2281: struct sshbuf *signdata;
2282: int r;
2283: const u_char *sig;
2284: size_t siglen;
2285:
2286: if (ctx->nnew == 0)
2287: fatal("%s: ctx->nnew == 0", __func__); /* sanity */
2288: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2289: error("Server failed to confirm ownership of "
2290: "private host keys");
2291: hostkeys_update_ctx_free(ctx);
2292: return;
2293: }
2294: if ((signdata = sshbuf_new()) == NULL)
2295: fatal("%s: sshbuf_new failed", __func__);
2296: /* Don't want to accidentally accept an unbound signature */
2297: if (ssh->kex->session_id_len == 0)
2298: fatal("%s: ssh->kex->session_id_len == 0", __func__);
2299: /*
2300: * Expect a signature for each of the ctx->nnew private keys we
2301: * haven't seen before. They will be in the same order as the
2302: * ctx->keys where the corresponding ctx->keys_seen[i] == 0.
2303: */
2304: for (ndone = i = 0; i < ctx->nkeys; i++) {
2305: if (ctx->keys_seen[i])
2306: continue;
2307: /* Prepare data to be signed: session ID, unique string, key */
2308: sshbuf_reset(signdata);
1.270 djm 2309: if ( (r = sshbuf_put_cstring(signdata,
2310: "hostkeys-prove-00@openssh.com")) != 0 ||
2311: (r = sshbuf_put_string(signdata, ssh->kex->session_id,
1.269 djm 2312: ssh->kex->session_id_len)) != 0 ||
2313: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
2314: fatal("%s: failed to prepare signature: %s",
2315: __func__, ssh_err(r));
2316: /* Extract and verify signature */
2317: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
2318: error("%s: couldn't parse message: %s",
2319: __func__, ssh_err(r));
2320: goto out;
2321: }
2322: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
2323: sshbuf_ptr(signdata), sshbuf_len(signdata), 0)) != 0) {
2324: error("%s: server gave bad signature for %s key %zu",
2325: __func__, sshkey_type(ctx->keys[i]), i);
2326: goto out;
2327: }
2328: /* Key is good. Mark it as 'seen' */
2329: ctx->keys_seen[i] = 2;
2330: ndone++;
2331: }
2332: if (ndone != ctx->nnew)
2333: fatal("%s: ndone != ctx->nnew (%zu / %zu)", __func__,
2334: ndone, ctx->nnew); /* Shouldn't happen */
2335: ssh_packet_check_eom(ssh);
2336:
2337: /* Make the edits to known_hosts */
2338: update_known_hosts(ctx);
2339: out:
2340: hostkeys_update_ctx_free(ctx);
2341: }
2342:
1.267 djm 2343: /*
1.270 djm 2344: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2345: * the server's hostkeys. The keys are checked against the user's
2346: * HostkeyAlgorithms preference before they are accepted.
2347: */
2348: static int
2349: client_input_hostkeys(void)
2350: {
1.269 djm 2351: struct ssh *ssh = active_state; /* XXX */
1.267 djm 2352: const u_char *blob = NULL;
1.269 djm 2353: size_t i, len = 0;
1.267 djm 2354: struct sshbuf *buf = NULL;
1.269 djm 2355: struct sshkey *key = NULL, **tmp;
2356: int r;
2357: char *fp;
1.267 djm 2358: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2359: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2360: struct hostkeys_update_ctx *ctx = NULL;
1.267 djm 2361:
2362: if (hostkeys_seen)
2363: fatal("%s: server already sent hostkeys", __func__);
1.269 djm 2364: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2365: options.batch_mode)
2366: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2367: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2368: return 1;
1.272 djm 2369:
2370: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2371: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2372: sshkey_free(key);
2373: key = NULL;
1.269 djm 2374: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
2375: error("%s: couldn't parse message: %s",
2376: __func__, ssh_err(r));
2377: goto out;
2378: }
1.270 djm 2379: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
2380: error("%s: parse key: %s", __func__, ssh_err(r));
2381: goto out;
2382: }
1.267 djm 2383: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2384: SSH_FP_DEFAULT);
2385: debug3("%s: received %s key %s", __func__,
2386: sshkey_type(key), fp);
2387: free(fp);
1.275 markus 2388:
1.267 djm 2389: /* Check that the key is accepted in HostkeyAlgorithms */
1.275 markus 2390: if (match_pattern_list(sshkey_ssh_name(key),
2391: options.hostkeyalgorithms ? options.hostkeyalgorithms :
2392: KEX_DEFAULT_PK_ALG, 0) != 1) {
1.267 djm 2393: debug3("%s: %s key not permitted by HostkeyAlgorithms",
2394: __func__, sshkey_ssh_name(key));
2395: continue;
2396: }
1.269 djm 2397: /* Skip certs */
2398: if (sshkey_is_cert(key)) {
2399: debug3("%s: %s key is a certificate; skipping",
2400: __func__, sshkey_ssh_name(key));
2401: continue;
2402: }
2403: /* Ensure keys are unique */
2404: for (i = 0; i < ctx->nkeys; i++) {
2405: if (sshkey_equal(key, ctx->keys[i])) {
2406: error("%s: received duplicated %s host key",
2407: __func__, sshkey_ssh_name(key));
2408: goto out;
2409: }
2410: }
2411: /* Key is good, record it */
2412: if ((tmp = reallocarray(ctx->keys, ctx->nkeys + 1,
2413: sizeof(*ctx->keys))) == NULL)
2414: fatal("%s: reallocarray failed nkeys = %zu",
2415: __func__, ctx->nkeys);
2416: ctx->keys = tmp;
2417: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2418: key = NULL;
2419: }
2420:
1.269 djm 2421: if (ctx->nkeys == 0) {
1.270 djm 2422: debug("%s: server sent no hostkeys", __func__);
1.267 djm 2423: goto out;
2424: }
1.270 djm 2425:
1.269 djm 2426: if ((ctx->keys_seen = calloc(ctx->nkeys,
2427: sizeof(*ctx->keys_seen))) == NULL)
2428: fatal("%s: calloc failed", __func__);
1.267 djm 2429:
1.268 djm 2430: get_hostfile_hostname_ipaddr(host,
2431: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2432: options.port, &ctx->host_str,
2433: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2434:
1.269 djm 2435: /* Find which keys we already know about. */
2436: if ((r = hostkeys_foreach(options.user_hostfiles[0], hostkeys_find,
2437: ctx, ctx->host_str, ctx->ip_str,
2438: HKF_WANT_PARSE_KEY|HKF_WANT_MATCH)) != 0) {
2439: error("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1.267 djm 2440: goto out;
2441: }
2442:
1.269 djm 2443: /* Figure out if we have any new keys to add */
2444: ctx->nnew = 0;
2445: for (i = 0; i < ctx->nkeys; i++) {
2446: if (!ctx->keys_seen[i])
2447: ctx->nnew++;
2448: }
2449:
2450: debug3("%s: %zu keys from server: %zu new, %zu retained. %zu to remove",
2451: __func__, ctx->nkeys, ctx->nnew, ctx->nkeys - ctx->nnew, ctx->nold);
2452:
2453: if (ctx->nnew == 0 && ctx->nold != 0) {
2454: /* We have some keys to remove. Just do it. */
2455: update_known_hosts(ctx);
2456: } else if (ctx->nnew != 0) {
2457: /*
2458: * We have received hitherto-unseen keys from the server.
2459: * Ask the server to confirm ownership of the private halves.
2460: */
2461: debug3("%s: asking server to prove ownership for %zu keys",
2462: __func__, ctx->nnew);
2463: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2464: (r = sshpkt_put_cstring(ssh,
1.270 djm 2465: "hostkeys-prove-00@openssh.com")) != 0 ||
1.269 djm 2466: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
2467: fatal("%s: cannot prepare packet: %s",
2468: __func__, ssh_err(r));
2469: if ((buf = sshbuf_new()) == NULL)
2470: fatal("%s: sshbuf_new", __func__);
2471: for (i = 0; i < ctx->nkeys; i++) {
2472: if (ctx->keys_seen[i])
2473: continue;
2474: sshbuf_reset(buf);
2475: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0)
2476: fatal("%s: sshkey_putb: %s",
2477: __func__, ssh_err(r));
2478: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
2479: fatal("%s: sshpkt_put_string: %s",
2480: __func__, ssh_err(r));
2481: }
2482: if ((r = sshpkt_send(ssh)) != 0)
2483: fatal("%s: sshpkt_send: %s", __func__, ssh_err(r));
2484: client_register_global_confirm(
2485: client_global_hostkeys_private_confirm, ctx);
2486: ctx = NULL; /* will be freed in callback */
2487: }
2488:
1.267 djm 2489: /* Success */
2490: out:
1.269 djm 2491: hostkeys_update_ctx_free(ctx);
1.267 djm 2492: sshkey_free(key);
2493: sshbuf_free(buf);
1.269 djm 2494: /*
2495: * NB. Return success for all cases. The server doesn't need to know
2496: * what the client does with its hosts file.
2497: */
2498: return 1;
1.267 djm 2499: }
2500:
1.264 markus 2501: static int
1.95 markus 2502: client_input_global_request(int type, u_int32_t seq, void *ctxt)
2503: {
2504: char *rtype;
2505: int want_reply;
2506: int success = 0;
2507:
1.267 djm 2508: rtype = packet_get_cstring(NULL);
1.95 markus 2509: want_reply = packet_get_char();
1.117 markus 2510: debug("client_input_global_request: rtype %s want_reply %d",
2511: rtype, want_reply);
1.270 djm 2512: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.267 djm 2513: success = client_input_hostkeys();
1.95 markus 2514: if (want_reply) {
2515: packet_start(success ?
2516: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
2517: packet_send();
2518: packet_write_wait();
2519: }
1.250 djm 2520: free(rtype);
1.264 markus 2521: return 0;
1.95 markus 2522: }
1.22 markus 2523:
1.123 djm 2524: void
1.129 deraadt 2525: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 2526: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 2527: {
2528: int len;
1.132 djm 2529: Channel *c = NULL;
1.123 djm 2530:
2531: debug2("%s: id %d", __func__, id);
2532:
1.132 djm 2533: if ((c = channel_lookup(id)) == NULL)
2534: fatal("client_session2_setup: channel %d: unknown channel", id);
1.224 djm 2535:
2536: packet_set_interactive(want_tty,
2537: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2538:
1.123 djm 2539: if (want_tty) {
2540: struct winsize ws;
2541:
2542: /* Store window size in the packet. */
2543: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2544: memset(&ws, 0, sizeof(ws));
2545:
1.190 djm 2546: channel_request_start(id, "pty-req", 1);
1.234 djm 2547: client_expect_confirm(id, "PTY allocation", CONFIRM_TTY);
1.123 djm 2548: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 2549: packet_put_int((u_int)ws.ws_col);
2550: packet_put_int((u_int)ws.ws_row);
2551: packet_put_int((u_int)ws.ws_xpixel);
2552: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 2553: if (tiop == NULL)
2554: tiop = get_saved_tio();
2555: tty_make_modes(-1, tiop);
1.123 djm 2556: packet_send();
2557: /* XXX wait for reply */
1.132 djm 2558: c->client_tty = 1;
1.123 djm 2559: }
2560:
2561: /* Transfer any environment variables from client to server */
1.126 djm 2562: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2563: int i, j, matched;
2564: char *name, *val;
2565:
2566: debug("Sending environment.");
1.126 djm 2567: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2568: /* Split */
1.126 djm 2569: name = xstrdup(env[i]);
1.123 djm 2570: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2571: free(name);
1.123 djm 2572: continue;
2573: }
2574: *val++ = '\0';
2575:
2576: matched = 0;
2577: for (j = 0; j < options.num_send_env; j++) {
2578: if (match_pattern(name, options.send_env[j])) {
2579: matched = 1;
2580: break;
2581: }
2582: }
2583: if (!matched) {
2584: debug3("Ignored env %s", name);
1.250 djm 2585: free(name);
1.123 djm 2586: continue;
2587: }
2588:
2589: debug("Sending env %s = %s", name, val);
2590: channel_request_start(id, "env", 0);
2591: packet_put_cstring(name);
2592: packet_put_cstring(val);
2593: packet_send();
1.250 djm 2594: free(name);
1.123 djm 2595: }
2596: }
2597:
2598: len = buffer_len(cmd);
2599: if (len > 0) {
2600: if (len > 900)
2601: len = 900;
2602: if (want_subsystem) {
1.190 djm 2603: debug("Sending subsystem: %.*s",
2604: len, (u_char*)buffer_ptr(cmd));
2605: channel_request_start(id, "subsystem", 1);
1.234 djm 2606: client_expect_confirm(id, "subsystem", CONFIRM_CLOSE);
1.123 djm 2607: } else {
1.190 djm 2608: debug("Sending command: %.*s",
2609: len, (u_char*)buffer_ptr(cmd));
2610: channel_request_start(id, "exec", 1);
1.234 djm 2611: client_expect_confirm(id, "exec", CONFIRM_CLOSE);
1.123 djm 2612: }
2613: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2614: packet_send();
2615: } else {
1.190 djm 2616: channel_request_start(id, "shell", 1);
1.234 djm 2617: client_expect_confirm(id, "shell", CONFIRM_CLOSE);
1.123 djm 2618: packet_send();
2619: }
2620: }
2621:
1.77 itojun 2622: static void
1.49 itojun 2623: client_init_dispatch_20(void)
1.16 markus 2624: {
1.55 markus 2625: dispatch_init(&dispatch_protocol_error);
1.100 markus 2626:
1.16 markus 2627: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2628: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2629: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2630: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2631: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2632: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2633: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2634: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2635: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2636: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2637: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2638: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2639:
2640: /* rekeying */
2641: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2642:
2643: /* global request reply messages */
2644: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2645: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 2646: }
1.197 djm 2647:
1.77 itojun 2648: static void
1.49 itojun 2649: client_init_dispatch_13(void)
1.15 markus 2650: {
2651: dispatch_init(NULL);
2652: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2653: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2654: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2655: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2656: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2657: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2658: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2659: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2660: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2661:
2662: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2663: &client_input_agent_open : &deny_input_open);
1.39 markus 2664: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2665: &x11_input_open : &deny_input_open);
1.15 markus 2666: }
1.197 djm 2667:
1.77 itojun 2668: static void
1.49 itojun 2669: client_init_dispatch_15(void)
1.15 markus 2670: {
2671: client_init_dispatch_13();
2672: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2673: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2674: }
1.197 djm 2675:
1.79 stevesk 2676: static void
1.49 itojun 2677: client_init_dispatch(void)
1.15 markus 2678: {
1.16 markus 2679: if (compat20)
2680: client_init_dispatch_20();
2681: else if (compat13)
1.15 markus 2682: client_init_dispatch_13();
2683: else
2684: client_init_dispatch_15();
1.232 djm 2685: }
2686:
2687: void
2688: client_stop_mux(void)
2689: {
2690: if (options.control_path != NULL && muxserver_sock != -1)
2691: unlink(options.control_path);
2692: /*
1.247 dtucker 2693: * If we are in persist mode, or don't have a shell, signal that we
2694: * should close when all active channels are closed.
1.232 djm 2695: */
1.247 dtucker 2696: if (options.control_persist || no_shell_flag) {
1.232 djm 2697: session_closed = 1;
1.235 djm 2698: setproctitle("[stopped mux]");
2699: }
1.113 markus 2700: }
2701:
2702: /* client specific fatal cleanup */
2703: void
1.114 markus 2704: cleanup_exit(int i)
1.113 markus 2705: {
1.233 djm 2706: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2707: leave_non_blocking();
1.192 djm 2708: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2709: unlink(options.control_path);
1.223 djm 2710: ssh_kill_proxy_command();
1.114 markus 2711: _exit(i);
1.1 deraadt 2712: }
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