Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.290
1.290 ! dtucker 1: /* $OpenBSD: clientloop.c,v 1.289 2016/09/30 09:19:13 markus Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.175 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;
1.288 tedu 306: int got_data = 0, generated = 0, do_unlink = 0, 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) {
1.288 tedu 433: u_int8_t rnd[16];
434: u_int i;
1.138 djm 435:
436: logit("Warning: No xauth data; "
437: "using fake authentication data for X11 forwarding.");
438: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.288 tedu 439: arc4random_buf(rnd, sizeof(rnd));
440: for (i = 0; i < sizeof(rnd); i++) {
1.138 djm 441: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.288 tedu 442: rnd[i]);
1.138 djm 443: }
444: }
1.279 djm 445:
446: return 0;
1.1 deraadt 447: }
448:
1.13 markus 449: /*
450: * This is called when the interactive is entered. This checks if there is
451: * an EOF coming on stdin. We must check this explicitly, as select() does
452: * not appear to wake up when redirecting from /dev/null.
453: */
1.1 deraadt 454:
1.77 itojun 455: static void
1.49 itojun 456: client_check_initial_eof_on_stdin(void)
1.1 deraadt 457: {
1.11 markus 458: int len;
459: char buf[1];
1.1 deraadt 460:
1.13 markus 461: /*
462: * If standard input is to be "redirected from /dev/null", we simply
463: * mark that we have seen an EOF and send an EOF message to the
464: * server. Otherwise, we try to read a single character; it appears
465: * that for some files, such /dev/null, select() never wakes up for
466: * read for this descriptor, which means that we never get EOF. This
467: * way we will get the EOF if stdin comes from /dev/null or similar.
468: */
1.11 markus 469: if (stdin_null_flag) {
470: /* Fake EOF on stdin. */
471: debug("Sending eof.");
472: stdin_eof = 1;
473: packet_start(SSH_CMSG_EOF);
474: packet_send();
475: } else {
476: enter_non_blocking();
477:
478: /* Check for immediate EOF on stdin. */
479: len = read(fileno(stdin), buf, 1);
480: if (len == 0) {
1.197 djm 481: /*
482: * EOF. Record that we have seen it and send
483: * EOF to server.
484: */
1.11 markus 485: debug("Sending eof.");
486: stdin_eof = 1;
487: packet_start(SSH_CMSG_EOF);
488: packet_send();
489: } else if (len > 0) {
1.13 markus 490: /*
491: * Got data. We must store the data in the buffer,
492: * and also process it as an escape character if
493: * appropriate.
494: */
1.195 djm 495: if ((u_char) buf[0] == escape_char1)
496: escape_pending1 = 1;
1.52 markus 497: else
1.11 markus 498: buffer_append(&stdin_buffer, buf, 1);
499: }
500: leave_non_blocking();
501: }
1.1 deraadt 502: }
503:
504:
1.13 markus 505: /*
506: * Make packets from buffered stdin data, and buffer them for sending to the
507: * connection.
508: */
1.1 deraadt 509:
1.77 itojun 510: static void
1.49 itojun 511: client_make_packets_from_stdin_data(void)
1.1 deraadt 512: {
1.42 markus 513: u_int len;
1.1 deraadt 514:
1.11 markus 515: /* Send buffered stdin data to the server. */
516: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 517: packet_not_very_much_data_to_write()) {
1.11 markus 518: len = buffer_len(&stdin_buffer);
519: /* Keep the packets at reasonable size. */
520: if (len > packet_get_maxsize())
521: len = packet_get_maxsize();
522: packet_start(SSH_CMSG_STDIN_DATA);
523: packet_put_string(buffer_ptr(&stdin_buffer), len);
524: packet_send();
525: buffer_consume(&stdin_buffer, len);
526: /* If we have a pending EOF, send it now. */
527: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
528: packet_start(SSH_CMSG_EOF);
529: packet_send();
530: }
1.1 deraadt 531: }
532: }
533:
1.13 markus 534: /*
535: * Checks if the client window has changed, and sends a packet about it to
536: * the server if so. The actual change is detected elsewhere (by a software
537: * interrupt on Unix); this just checks the flag and sends a message if
538: * appropriate.
539: */
1.1 deraadt 540:
1.77 itojun 541: static void
1.49 itojun 542: client_check_window_change(void)
1.1 deraadt 543: {
1.16 markus 544: struct winsize ws;
545:
546: if (! received_window_change_signal)
547: return;
548: /** XXX race */
549: received_window_change_signal = 0;
550:
1.37 markus 551: debug2("client_check_window_change: changed");
1.16 markus 552:
553: if (compat20) {
1.123 djm 554: channel_send_window_changes();
1.16 markus 555: } else {
1.123 djm 556: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
557: return;
1.16 markus 558: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 559: packet_put_int((u_int)ws.ws_row);
560: packet_put_int((u_int)ws.ws_col);
561: packet_put_int((u_int)ws.ws_xpixel);
562: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 563: packet_send();
1.1 deraadt 564: }
565: }
566:
1.264 markus 567: static int
1.117 markus 568: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
569: {
1.196 djm 570: struct global_confirm *gc;
571:
572: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 573: return 0;
1.196 djm 574: if (gc->cb != NULL)
575: gc->cb(type, seq, gc->ctx);
576: if (--gc->ref_count <= 0) {
577: TAILQ_REMOVE(&global_confirms, gc, entry);
1.257 tedu 578: explicit_bzero(gc, sizeof(*gc));
1.250 djm 579: free(gc);
1.196 djm 580: }
581:
1.210 andreas 582: packet_set_alive_timeouts(0);
1.264 markus 583: return 0;
1.117 markus 584: }
585:
586: static void
587: server_alive_check(void)
588: {
1.210 andreas 589: if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
1.228 djm 590: logit("Timeout, server %s not responding.", host);
1.176 markus 591: cleanup_exit(255);
592: }
1.117 markus 593: packet_start(SSH2_MSG_GLOBAL_REQUEST);
594: packet_put_cstring("keepalive@openssh.com");
595: packet_put_char(1); /* boolean: want reply */
596: packet_send();
1.196 djm 597: /* Insert an empty placeholder to maintain ordering */
598: client_register_global_confirm(NULL, NULL);
1.117 markus 599: }
600:
1.13 markus 601: /*
602: * Waits until the client can do something (some data becomes available on
603: * one of the file descriptors).
604: */
1.77 itojun 605: static void
1.46 markus 606: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 607: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 608: {
1.117 markus 609: struct timeval tv, *tvp;
1.222 djm 610: int timeout_secs;
1.251 dtucker 611: time_t minwait_secs = 0, server_alive_time = 0, now = monotime();
1.117 markus 612: int ret;
613:
1.46 markus 614: /* Add any selections by the channel mechanism. */
1.239 djm 615: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp,
616: &minwait_secs, rekeying);
1.11 markus 617:
1.16 markus 618: if (!compat20) {
1.17 markus 619: /* Read from the connection, unless our buffers are full. */
1.16 markus 620: if (buffer_len(&stdout_buffer) < buffer_high &&
621: buffer_len(&stderr_buffer) < buffer_high &&
622: channel_not_very_much_buffered_data())
1.46 markus 623: FD_SET(connection_in, *readsetp);
1.17 markus 624: /*
625: * Read from stdin, unless we have seen EOF or have very much
626: * buffered data to send to the server.
627: */
628: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 629: FD_SET(fileno(stdin), *readsetp);
1.17 markus 630:
631: /* Select stdout/stderr if have data in buffer. */
632: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 633: FD_SET(fileno(stdout), *writesetp);
1.17 markus 634: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 635: FD_SET(fileno(stderr), *writesetp);
1.16 markus 636: } else {
1.71 markus 637: /* channel_prepare_select could have closed the last channel */
1.84 markus 638: if (session_closed && !channel_still_open() &&
639: !packet_have_data_to_write()) {
640: /* clear mask since we did not call select() */
1.87 markus 641: memset(*readsetp, 0, *nallocp);
642: memset(*writesetp, 0, *nallocp);
1.84 markus 643: return;
1.71 markus 644: } else {
645: FD_SET(connection_in, *readsetp);
646: }
1.16 markus 647: }
1.11 markus 648:
649: /* Select server connection if have data to write to the server. */
650: if (packet_have_data_to_write())
1.46 markus 651: FD_SET(connection_out, *writesetp);
1.11 markus 652:
1.13 markus 653: /*
654: * Wait for something to happen. This will suspend the process until
655: * some selected descriptor can be read, written, or has some other
1.222 djm 656: * event pending, or a timeout expires.
1.13 markus 657: */
1.11 markus 658:
1.222 djm 659: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.249 dtucker 660: if (options.server_alive_interval > 0 && compat20) {
1.222 djm 661: timeout_secs = options.server_alive_interval;
1.249 dtucker 662: server_alive_time = now + options.server_alive_interval;
663: }
664: if (options.rekey_interval > 0 && compat20 && !rekeying)
1.287 deraadt 665: timeout_secs = MINIMUM(timeout_secs, packet_get_rekey_timeout());
1.222 djm 666: set_control_persist_exit_time();
667: if (control_persist_exit_time > 0) {
1.287 deraadt 668: timeout_secs = MINIMUM(timeout_secs,
1.249 dtucker 669: control_persist_exit_time - now);
1.222 djm 670: if (timeout_secs < 0)
671: timeout_secs = 0;
672: }
1.239 djm 673: if (minwait_secs != 0)
1.287 deraadt 674: timeout_secs = MINIMUM(timeout_secs, (int)minwait_secs);
1.222 djm 675: if (timeout_secs == INT_MAX)
1.117 markus 676: tvp = NULL;
1.129 deraadt 677: else {
1.222 djm 678: tv.tv_sec = timeout_secs;
1.117 markus 679: tv.tv_usec = 0;
680: tvp = &tv;
681: }
1.222 djm 682:
1.117 markus 683: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
684: if (ret < 0) {
1.11 markus 685: char buf[100];
1.51 markus 686:
687: /*
688: * We have to clear the select masks, because we return.
689: * We have to return, because the mainloop checks for the flags
690: * set by the signal handlers.
691: */
1.87 markus 692: memset(*readsetp, 0, *nallocp);
693: memset(*writesetp, 0, *nallocp);
1.50 deraadt 694:
1.11 markus 695: if (errno == EINTR)
696: return;
697: /* Note: we might still have data in the buffers. */
698: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
699: buffer_append(&stderr_buffer, buf, strlen(buf));
700: quit_pending = 1;
1.249 dtucker 701: } else if (ret == 0) {
702: /*
703: * Timeout. Could have been either keepalive or rekeying.
704: * Keepalive we check here, rekeying is checked in clientloop.
705: */
1.251 dtucker 706: if (server_alive_time != 0 && server_alive_time <= monotime())
1.249 dtucker 707: server_alive_check();
708: }
709:
1.11 markus 710: }
711:
1.77 itojun 712: static void
1.31 markus 713: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 714: {
1.11 markus 715: /* Flush stdout and stderr buffers. */
1.31 markus 716: if (buffer_len(bout) > 0)
1.197 djm 717: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
718: buffer_len(bout));
1.31 markus 719: if (buffer_len(berr) > 0)
1.197 djm 720: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
721: buffer_len(berr));
1.11 markus 722:
1.233 djm 723: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 724:
1.13 markus 725: /*
726: * Free (and clear) the buffer to reduce the amount of data that gets
727: * written to swap.
728: */
1.31 markus 729: buffer_free(bin);
730: buffer_free(bout);
731: buffer_free(berr);
1.11 markus 732:
733: /* Send the suspend signal to the program itself. */
734: kill(getpid(), SIGTSTP);
735:
1.132 djm 736: /* Reset window sizes in case they have changed */
737: received_window_change_signal = 1;
1.11 markus 738:
739: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 740: buffer_init(bin);
741: buffer_init(bout);
742: buffer_init(berr);
1.11 markus 743:
1.233 djm 744: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 745: }
746:
1.77 itojun 747: static void
1.161 deraadt 748: client_process_net_input(fd_set *readset)
1.11 markus 749: {
1.280 markus 750: int len;
1.17 markus 751: char buf[8192];
1.11 markus 752:
1.13 markus 753: /*
754: * Read input from the server, and add any such data to the buffer of
755: * the packet subsystem.
756: */
1.11 markus 757: if (FD_ISSET(connection_in, readset)) {
758: /* Read as much as possible. */
1.280 markus 759: len = read(connection_in, buf, sizeof(buf));
760: if (len == 0) {
1.197 djm 761: /*
762: * Received EOF. The remote host has closed the
763: * connection.
764: */
765: snprintf(buf, sizeof buf,
766: "Connection to %.300s closed by remote host.\r\n",
767: host);
1.1 deraadt 768: buffer_append(&stderr_buffer, buf, strlen(buf));
769: quit_pending = 1;
770: return;
1.11 markus 771: }
1.13 markus 772: /*
773: * There is a kernel bug on Solaris that causes select to
774: * sometimes wake up even though there is no data available.
775: */
1.53 millert 776: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 777: len = 0;
778:
779: if (len < 0) {
1.197 djm 780: /*
781: * An error has encountered. Perhaps there is a
782: * network problem.
783: */
784: snprintf(buf, sizeof buf,
785: "Read from remote host %.300s: %.100s\r\n",
786: host, strerror(errno));
1.11 markus 787: buffer_append(&stderr_buffer, buf, strlen(buf));
788: quit_pending = 1;
789: return;
790: }
791: packet_process_incoming(buf, len);
792: }
1.17 markus 793: }
1.16 markus 794:
1.97 jakob 795: static void
1.190 djm 796: client_status_confirm(int type, Channel *c, void *ctx)
1.123 djm 797: {
1.190 djm 798: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
799: char errmsg[256];
800: int tochan;
801:
1.234 djm 802: /*
803: * If a TTY was explicitly requested, then a failure to allocate
804: * one is fatal.
805: */
806: if (cr->action == CONFIRM_TTY &&
807: (options.request_tty == REQUEST_TTY_FORCE ||
808: options.request_tty == REQUEST_TTY_YES))
809: cr->action = CONFIRM_CLOSE;
810:
1.190 djm 811: /* XXX supress on mux _client_ quietmode */
812: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 813: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 814:
815: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
816: debug2("%s request accepted on channel %d",
817: cr->request_type, c->self);
818: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
819: if (tochan) {
820: snprintf(errmsg, sizeof(errmsg),
821: "%s request failed\r\n", cr->request_type);
822: } else {
823: snprintf(errmsg, sizeof(errmsg),
824: "%s request failed on channel %d",
825: cr->request_type, c->self);
826: }
827: /* If error occurred on primary session channel, then exit */
1.234 djm 828: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 829: fatal("%s", errmsg);
1.234 djm 830: /*
831: * If error occurred on mux client, append to
832: * their stderr.
833: */
834: if (tochan) {
835: buffer_append(&c->extended, errmsg,
836: strlen(errmsg));
837: } else
1.190 djm 838: error("%s", errmsg);
1.234 djm 839: if (cr->action == CONFIRM_TTY) {
840: /*
841: * If a TTY allocation error occurred, then arrange
842: * for the correct TTY to leave raw mode.
843: */
844: if (c->self == session_ident)
845: leave_raw_mode(0);
846: else
847: mux_tty_alloc_failed(c);
848: } else if (cr->action == CONFIRM_CLOSE) {
1.190 djm 849: chan_read_failed(c);
850: chan_write_failed(c);
851: }
852: }
1.250 djm 853: free(cr);
1.190 djm 854: }
855:
856: static void
857: client_abandon_status_confirm(Channel *c, void *ctx)
858: {
1.250 djm 859: free(ctx);
1.190 djm 860: }
1.129 deraadt 861:
1.236 djm 862: void
1.234 djm 863: client_expect_confirm(int id, const char *request,
864: enum confirm_action action)
1.190 djm 865: {
1.255 djm 866: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 867:
1.190 djm 868: cr->request_type = request;
1.234 djm 869: cr->action = action;
1.123 djm 870:
1.190 djm 871: channel_register_status_confirm(id, client_status_confirm,
872: client_abandon_status_confirm, cr);
1.196 djm 873: }
874:
875: void
876: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
877: {
1.201 djm 878: struct global_confirm *gc, *last_gc;
1.196 djm 879:
880: /* Coalesce identical callbacks */
1.201 djm 881: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
882: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
883: if (++last_gc->ref_count >= INT_MAX)
884: fatal("%s: last_gc->ref_count = %d",
885: __func__, last_gc->ref_count);
1.196 djm 886: return;
887: }
888:
1.255 djm 889: gc = xcalloc(1, sizeof(*gc));
1.196 djm 890: gc->cb = cb;
891: gc->ctx = ctx;
892: gc->ref_count = 1;
893: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 894: }
895:
896: static void
1.99 markus 897: process_cmdline(void)
1.97 jakob 898: {
899: void (*handler)(int);
1.261 millert 900: char *s, *cmd;
901: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
902: struct Forward fwd;
1.97 jakob 903:
1.257 tedu 904: memset(&fwd, 0, sizeof(fwd));
1.183 djm 905:
1.233 djm 906: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 907: handler = signal(SIGINT, SIG_IGN);
1.99 markus 908: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 909: if (s == NULL)
910: goto out;
1.256 deraadt 911: while (isspace((u_char)*s))
1.97 jakob 912: s++;
1.121 djm 913: if (*s == '-')
914: s++; /* Skip cmdline '-', if any */
1.120 dtucker 915: if (*s == '\0')
1.97 jakob 916: goto out;
1.121 djm 917:
1.122 djm 918: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 919: logit("Commands:");
1.164 djm 920: logit(" -L[bind_address:]port:host:hostport "
921: "Request local forward");
922: logit(" -R[bind_address:]port:host:hostport "
923: "Request remote forward");
1.204 stevesk 924: logit(" -D[bind_address:]port "
925: "Request dynamic forward");
1.237 markus 926: logit(" -KL[bind_address:]port "
927: "Cancel local forward");
1.165 stevesk 928: logit(" -KR[bind_address:]port "
1.164 djm 929: "Cancel remote forward");
1.237 markus 930: logit(" -KD[bind_address:]port "
931: "Cancel dynamic forward");
1.146 reyk 932: if (!options.permit_local_command)
933: goto out;
1.164 djm 934: logit(" !args "
935: "Execute local command");
1.146 reyk 936: goto out;
937: }
938:
939: if (*s == '!' && options.permit_local_command) {
940: s++;
941: ssh_local_cmd(s);
1.121 djm 942: goto out;
943: }
944:
945: if (*s == 'K') {
946: delete = 1;
947: s++;
948: }
1.204 stevesk 949: if (*s == 'L')
950: local = 1;
951: else if (*s == 'R')
952: remote = 1;
953: else if (*s == 'D')
954: dynamic = 1;
955: else {
1.109 itojun 956: logit("Invalid command.");
1.97 jakob 957: goto out;
958: }
1.204 stevesk 959:
1.237 markus 960: if (delete && !compat20) {
1.109 itojun 961: logit("Not supported for SSH protocol version 1.");
1.97 jakob 962: goto out;
963: }
1.121 djm 964:
1.256 deraadt 965: while (isspace((u_char)*++s))
1.179 tedu 966: ;
1.97 jakob 967:
1.217 djm 968: /* XXX update list of forwards in options */
1.121 djm 969: if (delete) {
1.261 millert 970: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
971: if (!parse_forward(&fwd, s, 1, 0)) {
972: logit("Bad forwarding close specification.");
1.121 djm 973: goto out;
974: }
1.237 markus 975: if (remote)
1.261 millert 976: ok = channel_request_rforward_cancel(&fwd) == 0;
1.237 markus 977: else if (dynamic)
1.261 millert 978: ok = channel_cancel_lport_listener(&fwd,
979: 0, &options.fwd_opts) > 0;
1.237 markus 980: else
1.261 millert 981: ok = channel_cancel_lport_listener(&fwd,
982: CHANNEL_CANCEL_PORT_STATIC,
983: &options.fwd_opts) > 0;
1.237 markus 984: if (!ok) {
1.290 ! dtucker 985: logit("Unknown port forwarding.");
1.237 markus 986: goto out;
987: }
988: logit("Canceled forwarding.");
1.121 djm 989: } else {
1.209 djm 990: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 991: logit("Bad forwarding specification.");
992: goto out;
993: }
1.204 stevesk 994: if (local || dynamic) {
1.261 millert 995: if (!channel_setup_local_fwd_listener(&fwd,
996: &options.fwd_opts)) {
1.121 djm 997: logit("Port forwarding failed.");
998: goto out;
999: }
1.135 djm 1000: } else {
1.261 millert 1001: if (channel_request_remote_forwarding(&fwd) < 0) {
1.167 markus 1002: logit("Port forwarding failed.");
1003: goto out;
1004: }
1.135 djm 1005: }
1.121 djm 1006: logit("Forwarding port.");
1007: }
1008:
1.97 jakob 1009: out:
1010: signal(SIGINT, handler);
1.233 djm 1011: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 1012: free(cmd);
1013: free(fwd.listen_host);
1.261 millert 1014: free(fwd.listen_path);
1.250 djm 1015: free(fwd.connect_host);
1.261 millert 1016: free(fwd.connect_path);
1.97 jakob 1017: }
1018:
1.244 dtucker 1019: /* reasons to suppress output of an escape command in help output */
1020: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1021: #define SUPPRESS_PROTO1 1 /* don't show in protocol 1 sessions */
1022: #define SUPPRESS_MUXCLIENT 2 /* don't show in mux client sessions */
1023: #define SUPPRESS_MUXMASTER 4 /* don't show in mux master sessions */
1024: #define SUPPRESS_SYSLOG 8 /* don't show when logging to syslog */
1025: struct escape_help_text {
1026: const char *cmd;
1027: const char *text;
1028: unsigned int flags;
1029: };
1030: static struct escape_help_text esc_txt[] = {
1031: {".", "terminate session", SUPPRESS_MUXMASTER},
1032: {".", "terminate connection (and any multiplexed sessions)",
1033: SUPPRESS_MUXCLIENT},
1034: {"B", "send a BREAK to the remote system", SUPPRESS_PROTO1},
1035: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1036: {"R", "request rekey", SUPPRESS_PROTO1},
1.246 dtucker 1037: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 1038: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
1039: {"#", "list forwarded connections", SUPPRESS_NEVER},
1040: {"&", "background ssh (when waiting for connections to terminate)",
1041: SUPPRESS_MUXCLIENT},
1042: {"?", "this message", SUPPRESS_NEVER},
1043: };
1044:
1045: static void
1046: print_escape_help(Buffer *b, int escape_char, int protocol2, int mux_client,
1047: int using_stderr)
1048: {
1049: unsigned int i, suppress_flags;
1050: char string[1024];
1051:
1052: snprintf(string, sizeof string, "%c?\r\n"
1053: "Supported escape sequences:\r\n", escape_char);
1054: buffer_append(b, string, strlen(string));
1055:
1056: suppress_flags = (protocol2 ? 0 : SUPPRESS_PROTO1) |
1057: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
1058: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
1059: (using_stderr ? 0 : SUPPRESS_SYSLOG);
1060:
1061: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
1062: if (esc_txt[i].flags & suppress_flags)
1063: continue;
1.246 dtucker 1064: snprintf(string, sizeof string, " %c%-3s - %s\r\n",
1.244 dtucker 1065: escape_char, esc_txt[i].cmd, esc_txt[i].text);
1066: buffer_append(b, string, strlen(string));
1067: }
1068:
1069: snprintf(string, sizeof string,
1.246 dtucker 1070: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 1071: "(Note that escapes are only recognized immediately after "
1072: "newline.)\r\n", escape_char, escape_char);
1073: buffer_append(b, string, strlen(string));
1074: }
1075:
1.195 djm 1076: /*
1077: * Process the characters one by one, call with c==NULL for proto1 case.
1078: */
1.77 itojun 1079: static int
1.195 djm 1080: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
1081: char *buf, int len)
1.31 markus 1082: {
1.32 markus 1083: char string[1024];
1.31 markus 1084: pid_t pid;
1085: int bytes = 0;
1.42 markus 1086: u_int i;
1087: u_char ch;
1.31 markus 1088: char *s;
1.195 djm 1089: int *escape_pendingp, escape_char;
1090: struct escape_filter_ctx *efc;
1.31 markus 1091:
1.195 djm 1092: if (c == NULL) {
1093: escape_pendingp = &escape_pending1;
1094: escape_char = escape_char1;
1095: } else {
1096: if (c->filter_ctx == NULL)
1097: return 0;
1098: efc = (struct escape_filter_ctx *)c->filter_ctx;
1099: escape_pendingp = &efc->escape_pending;
1100: escape_char = efc->escape_char;
1101: }
1102:
1.139 djm 1103: if (len <= 0)
1104: return (0);
1105:
1106: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1107: /* Get one character at a time. */
1108: ch = buf[i];
1109:
1.195 djm 1110: if (*escape_pendingp) {
1.31 markus 1111: /* We have previously seen an escape character. */
1112: /* Clear the flag now. */
1.195 djm 1113: *escape_pendingp = 0;
1.31 markus 1114:
1115: /* Process the escaped character. */
1116: switch (ch) {
1117: case '.':
1118: /* Terminate the connection. */
1.195 djm 1119: snprintf(string, sizeof string, "%c.\r\n",
1120: escape_char);
1.32 markus 1121: buffer_append(berr, string, strlen(string));
1.31 markus 1122:
1.217 djm 1123: if (c && c->ctl_chan != -1) {
1.195 djm 1124: chan_read_failed(c);
1125: chan_write_failed(c);
1.252 dtucker 1126: if (c->detach_user)
1127: c->detach_user(c->self, NULL);
1.253 dtucker 1128: c->type = SSH_CHANNEL_ABANDONED;
1129: buffer_clear(&c->input);
1130: chan_ibuf_empty(c);
1.195 djm 1131: return 0;
1132: } else
1133: quit_pending = 1;
1.31 markus 1134: return -1;
1135:
1136: case 'Z' - 64:
1.195 djm 1137: /* XXX support this for mux clients */
1.217 djm 1138: if (c && c->ctl_chan != -1) {
1.245 dtucker 1139: char b[16];
1.195 djm 1140: noescape:
1.245 dtucker 1141: if (ch == 'Z' - 64)
1142: snprintf(b, sizeof b, "^Z");
1143: else
1144: snprintf(b, sizeof b, "%c", ch);
1.195 djm 1145: snprintf(string, sizeof string,
1.245 dtucker 1146: "%c%s escape not available to "
1.195 djm 1147: "multiplexed sessions\r\n",
1.245 dtucker 1148: escape_char, b);
1.195 djm 1149: buffer_append(berr, string,
1150: strlen(string));
1151: continue;
1152: }
1.197 djm 1153: /* Suspend the program. Inform the user */
1.195 djm 1154: snprintf(string, sizeof string,
1155: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 1156: buffer_append(berr, string, strlen(string));
1.31 markus 1157:
1158: /* Restore terminal modes and suspend. */
1159: client_suspend_self(bin, bout, berr);
1160:
1161: /* We have been continued. */
1162: continue;
1163:
1.111 markus 1164: case 'B':
1165: if (compat20) {
1166: snprintf(string, sizeof string,
1167: "%cB\r\n", escape_char);
1168: buffer_append(berr, string,
1169: strlen(string));
1.254 djm 1170: channel_request_start(c->self,
1.111 markus 1171: "break", 0);
1172: packet_put_int(1000);
1173: packet_send();
1174: }
1175: continue;
1176:
1.54 markus 1177: case 'R':
1.59 markus 1178: if (compat20) {
1179: if (datafellows & SSH_BUG_NOREKEY)
1.197 djm 1180: logit("Server does not "
1181: "support re-keying");
1.59 markus 1182: else
1183: need_rekeying = 1;
1184: }
1.54 markus 1185: continue;
1186:
1.242 dtucker 1187: case 'V':
1188: /* FALLTHROUGH */
1189: case 'v':
1190: if (c && c->ctl_chan != -1)
1191: goto noescape;
1192: if (!log_is_on_stderr()) {
1193: snprintf(string, sizeof string,
1194: "%c%c [Logging to syslog]\r\n",
1195: escape_char, ch);
1196: buffer_append(berr, string,
1197: strlen(string));
1198: continue;
1199: }
1200: if (ch == 'V' && options.log_level >
1201: SYSLOG_LEVEL_QUIET)
1202: log_change_level(--options.log_level);
1203: if (ch == 'v' && options.log_level <
1204: SYSLOG_LEVEL_DEBUG3)
1205: log_change_level(++options.log_level);
1206: snprintf(string, sizeof string,
1207: "%c%c [LogLevel %s]\r\n", escape_char, ch,
1208: log_level_name(options.log_level));
1209: buffer_append(berr, string, strlen(string));
1210: continue;
1211:
1.31 markus 1212: case '&':
1.217 djm 1213: if (c && c->ctl_chan != -1)
1.195 djm 1214: goto noescape;
1.31 markus 1215: /*
1.197 djm 1216: * Detach the program (continue to serve
1217: * connections, but put in background and no
1218: * more new connections).
1.31 markus 1219: */
1220: /* Restore tty modes. */
1.233 djm 1221: leave_raw_mode(
1222: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1223:
1224: /* Stop listening for new connections. */
1.86 markus 1225: channel_stop_listening();
1.31 markus 1226:
1.86 markus 1227: snprintf(string, sizeof string,
1228: "%c& [backgrounded]\n", escape_char);
1229: buffer_append(berr, string, strlen(string));
1.31 markus 1230:
1231: /* Fork into background. */
1232: pid = fork();
1233: if (pid < 0) {
1234: error("fork: %.100s", strerror(errno));
1235: continue;
1236: }
1237: if (pid != 0) { /* This is the parent. */
1238: /* The parent just exits. */
1239: exit(0);
1240: }
1241: /* The child continues serving connections. */
1.86 markus 1242: if (compat20) {
1243: buffer_append(bin, "\004", 1);
1244: /* fake EOF on stdin */
1245: return -1;
1246: } else if (!stdin_eof) {
1247: /*
1.197 djm 1248: * Sending SSH_CMSG_EOF alone does not
1249: * always appear to be enough. So we
1250: * try to send an EOF character first.
1.86 markus 1251: */
1252: packet_start(SSH_CMSG_STDIN_DATA);
1253: packet_put_string("\004", 1);
1254: packet_send();
1255: /* Close stdin. */
1256: stdin_eof = 1;
1257: if (buffer_len(bin) == 0) {
1258: packet_start(SSH_CMSG_EOF);
1259: packet_send();
1260: }
1261: }
1262: continue;
1.31 markus 1263:
1264: case '?':
1.244 dtucker 1265: print_escape_help(berr, escape_char, compat20,
1266: (c && c->ctl_chan != -1),
1267: log_is_on_stderr());
1.31 markus 1268: continue;
1269:
1270: case '#':
1.195 djm 1271: snprintf(string, sizeof string, "%c#\r\n",
1272: escape_char);
1.32 markus 1273: buffer_append(berr, string, strlen(string));
1.31 markus 1274: s = channel_open_message();
1275: buffer_append(berr, s, strlen(s));
1.250 djm 1276: free(s);
1.97 jakob 1277: continue;
1278:
1279: case 'C':
1.217 djm 1280: if (c && c->ctl_chan != -1)
1.206 djm 1281: goto noescape;
1.99 markus 1282: process_cmdline();
1.31 markus 1283: continue;
1284:
1285: default:
1286: if (ch != escape_char) {
1287: buffer_put_char(bin, escape_char);
1288: bytes++;
1289: }
1290: /* Escaped characters fall through here */
1291: break;
1292: }
1293: } else {
1294: /*
1.197 djm 1295: * The previous character was not an escape char.
1296: * Check if this is an escape.
1.31 markus 1297: */
1298: if (last_was_cr && ch == escape_char) {
1.197 djm 1299: /*
1300: * It is. Set the flag and continue to
1301: * next character.
1302: */
1.195 djm 1303: *escape_pendingp = 1;
1.31 markus 1304: continue;
1305: }
1306: }
1307:
1308: /*
1309: * Normal character. Record whether it was a newline,
1310: * and append it to the buffer.
1311: */
1312: last_was_cr = (ch == '\r' || ch == '\n');
1313: buffer_put_char(bin, ch);
1314: bytes++;
1315: }
1316: return bytes;
1317: }
1318:
1.77 itojun 1319: static void
1.161 deraadt 1320: client_process_input(fd_set *readset)
1.17 markus 1321: {
1.21 deraadt 1322: int len;
1.31 markus 1323: char buf[8192];
1.16 markus 1324:
1.11 markus 1325: /* Read input from stdin. */
1326: if (FD_ISSET(fileno(stdin), readset)) {
1327: /* Read as much as possible. */
1328: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1329: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1330: return; /* we'll try again later */
1.11 markus 1331: if (len <= 0) {
1.13 markus 1332: /*
1333: * Received EOF or error. They are treated
1334: * similarly, except that an error message is printed
1335: * if it was an error condition.
1336: */
1.11 markus 1337: if (len < 0) {
1.197 djm 1338: snprintf(buf, sizeof buf, "read: %.100s\r\n",
1339: strerror(errno));
1.11 markus 1340: buffer_append(&stderr_buffer, buf, strlen(buf));
1341: }
1342: /* Mark that we have seen EOF. */
1343: stdin_eof = 1;
1.13 markus 1344: /*
1345: * Send an EOF message to the server unless there is
1346: * data in the buffer. If there is data in the
1347: * buffer, no message will be sent now. Code
1348: * elsewhere will send the EOF when the buffer
1349: * becomes empty if stdin_eof is set.
1350: */
1.11 markus 1351: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1352: packet_start(SSH_CMSG_EOF);
1353: packet_send();
1.11 markus 1354: }
1.195 djm 1355: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1356: /*
1357: * Normal successful read, and no escape character.
1358: * Just append the data to buffer.
1359: */
1.11 markus 1360: buffer_append(&stdin_buffer, buf, len);
1361: } else {
1.13 markus 1362: /*
1.197 djm 1363: * Normal, successful read. But we have an escape
1364: * character and have to process the characters one
1365: * by one.
1.13 markus 1366: */
1.195 djm 1367: if (process_escapes(NULL, &stdin_buffer,
1368: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1369: return;
1.11 markus 1370: }
1371: }
1372: }
1373:
1.77 itojun 1374: static void
1.161 deraadt 1375: client_process_output(fd_set *writeset)
1.11 markus 1376: {
1377: int len;
1378: char buf[100];
1.1 deraadt 1379:
1.11 markus 1380: /* Write buffered output to stdout. */
1381: if (FD_ISSET(fileno(stdout), writeset)) {
1382: /* Write as much data as possible. */
1383: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1384: buffer_len(&stdout_buffer));
1.11 markus 1385: if (len <= 0) {
1.64 markus 1386: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1387: len = 0;
1388: else {
1.13 markus 1389: /*
1390: * An error or EOF was encountered. Put an
1391: * error message to stderr buffer.
1392: */
1.197 djm 1393: snprintf(buf, sizeof buf,
1394: "write stdout: %.50s\r\n", strerror(errno));
1.11 markus 1395: buffer_append(&stderr_buffer, buf, strlen(buf));
1396: quit_pending = 1;
1397: return;
1398: }
1399: }
1400: /* Consume printed data from the buffer. */
1401: buffer_consume(&stdout_buffer, len);
1402: }
1403: /* Write buffered output to stderr. */
1404: if (FD_ISSET(fileno(stderr), writeset)) {
1405: /* Write as much data as possible. */
1406: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1407: buffer_len(&stderr_buffer));
1.11 markus 1408: if (len <= 0) {
1.64 markus 1409: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1410: len = 0;
1411: else {
1.197 djm 1412: /*
1413: * EOF or error, but can't even print
1414: * error message.
1415: */
1.11 markus 1416: quit_pending = 1;
1417: return;
1418: }
1419: }
1420: /* Consume printed characters from the buffer. */
1421: buffer_consume(&stderr_buffer, len);
1422: }
1.1 deraadt 1423: }
1424:
1.13 markus 1425: /*
1.15 markus 1426: * Get packets from the connection input buffer, and process them as long as
1427: * there are packets available.
1428: *
1429: * Any unknown packets received during the actual
1430: * session cause the session to terminate. This is
1431: * intended to make debugging easier since no
1432: * confirmations are sent. Any compatible protocol
1433: * extensions must be negotiated during the
1434: * preparatory phase.
1435: */
1436:
1.77 itojun 1437: static void
1.49 itojun 1438: client_process_buffered_input_packets(void)
1.15 markus 1439: {
1.265 markus 1440: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, active_state);
1.15 markus 1441: }
1442:
1.31 markus 1443: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1444:
1.195 djm 1445: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1446: void *
1447: client_new_escape_filter_ctx(int escape_char)
1448: {
1449: struct escape_filter_ctx *ret;
1450:
1.255 djm 1451: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1452: ret->escape_pending = 0;
1453: ret->escape_char = escape_char;
1454: return (void *)ret;
1455: }
1456:
1.198 djm 1457: /* Free the escape filter context on channel free */
1458: void
1459: client_filter_cleanup(int cid, void *ctx)
1460: {
1.250 djm 1461: free(ctx);
1.198 djm 1462: }
1463:
1.195 djm 1464: int
1465: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1466: {
1.190 djm 1467: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1468: return 0;
1469:
1.195 djm 1470: return process_escapes(c, &c->input, &c->output, &c->extended,
1471: buf, len);
1.30 markus 1472: }
1473:
1.77 itojun 1474: static void
1.60 markus 1475: client_channel_closed(int id, void *arg)
1476: {
1.83 markus 1477: channel_cancel_cleanup(id);
1.60 markus 1478: session_closed = 1;
1.233 djm 1479: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1480: }
1481:
1.15 markus 1482: /*
1.13 markus 1483: * Implements the interactive session with the server. This is called after
1484: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1485: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1486: * used as an escape character for terminating or suspending the session.
1.13 markus 1487: */
1.1 deraadt 1488:
1.20 markus 1489: int
1.30 markus 1490: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1491: {
1.46 markus 1492: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1493: double start_time, total_time;
1.284 djm 1494: int r, max_fd = 0, max_fd2 = 0, len;
1.200 markus 1495: u_int64_t ibytes, obytes;
1.130 avsm 1496: u_int nalloc = 0;
1.11 markus 1497: char buf[100];
1498:
1499: debug("Entering interactive session.");
1.277 semarie 1500:
1.278 semarie 1501: if (options.control_master &&
1.286 djm 1502: !option_clear_or_none(options.control_path)) {
1.278 semarie 1503: debug("pledge: id");
1.285 tb 1504: if (pledge("stdio rpath wpath cpath unix inet dns recvfd proc exec id tty",
1.278 semarie 1505: NULL) == -1)
1506: fatal("%s pledge(): %s", __func__, strerror(errno));
1507:
1508: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1509: debug("pledge: exec");
1510: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1511: NULL) == -1)
1512: fatal("%s pledge(): %s", __func__, strerror(errno));
1513:
1514: } else if (options.update_hostkeys) {
1515: debug("pledge: filesystem full");
1516: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1517: NULL) == -1)
1518: fatal("%s pledge(): %s", __func__, strerror(errno));
1519:
1.286 djm 1520: } else if (!option_clear_or_none(options.proxy_command) ||
1521: fork_after_authentication_flag) {
1.277 semarie 1522: debug("pledge: proc");
1523: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1524: fatal("%s pledge(): %s", __func__, strerror(errno));
1525:
1526: } else {
1527: debug("pledge: network");
1528: if (pledge("stdio unix inet dns tty", NULL) == -1)
1529: fatal("%s pledge(): %s", __func__, strerror(errno));
1530: }
1.11 markus 1531:
1532: start_time = get_current_time();
1533:
1534: /* Initialize variables. */
1.195 djm 1535: escape_pending1 = 0;
1.11 markus 1536: last_was_cr = 1;
1537: exit_status = -1;
1538: stdin_eof = 0;
1539: buffer_high = 64 * 1024;
1540: connection_in = packet_get_connection_in();
1541: connection_out = packet_get_connection_out();
1.287 deraadt 1542: max_fd = MAXIMUM(connection_in, connection_out);
1.46 markus 1543:
1544: if (!compat20) {
1.63 markus 1545: /* enable nonblocking unless tty */
1546: if (!isatty(fileno(stdin)))
1547: set_nonblock(fileno(stdin));
1548: if (!isatty(fileno(stdout)))
1549: set_nonblock(fileno(stdout));
1550: if (!isatty(fileno(stderr)))
1551: set_nonblock(fileno(stderr));
1.287 deraadt 1552: max_fd = MAXIMUM(max_fd, fileno(stdin));
1553: max_fd = MAXIMUM(max_fd, fileno(stdout));
1554: max_fd = MAXIMUM(max_fd, fileno(stderr));
1.46 markus 1555: }
1.11 markus 1556: quit_pending = 0;
1.195 djm 1557: escape_char1 = escape_char_arg;
1.11 markus 1558:
1559: /* Initialize buffers. */
1560: buffer_init(&stdin_buffer);
1561: buffer_init(&stdout_buffer);
1562: buffer_init(&stderr_buffer);
1563:
1.15 markus 1564: client_init_dispatch();
1565:
1.105 markus 1566: /*
1567: * Set signal handlers, (e.g. to restore non-blocking mode)
1568: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1569: */
1.131 djm 1570: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1571: signal(SIGHUP, signal_handler);
1.105 markus 1572: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1573: signal(SIGINT, signal_handler);
1574: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1575: signal(SIGQUIT, signal_handler);
1576: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1577: signal(SIGTERM, signal_handler);
1.132 djm 1578: signal(SIGWINCH, window_change_handler);
1.11 markus 1579:
1580: if (have_pty)
1.233 djm 1581: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1582:
1.48 markus 1583: if (compat20) {
1584: session_ident = ssh2_chan_id;
1.232 djm 1585: if (session_ident != -1) {
1586: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1587: channel_register_filter(session_ident,
1588: client_simple_escape_filter, NULL,
1589: client_filter_cleanup,
1590: client_new_escape_filter_ctx(
1591: escape_char_arg));
1592: }
1.60 markus 1593: channel_register_cleanup(session_ident,
1.143 djm 1594: client_channel_closed, 0);
1.232 djm 1595: }
1.48 markus 1596: } else {
1597: /* Check if we should immediately send eof on stdin. */
1.16 markus 1598: client_check_initial_eof_on_stdin();
1.48 markus 1599: }
1.30 markus 1600:
1.11 markus 1601: /* Main loop of the client for the interactive session mode. */
1602: while (!quit_pending) {
1603:
1.13 markus 1604: /* Process buffered packets sent by the server. */
1.11 markus 1605: client_process_buffered_input_packets();
1606:
1.60 markus 1607: if (compat20 && session_closed && !channel_still_open())
1608: break;
1609:
1.284 djm 1610: if (ssh_packet_is_rekeying(active_state)) {
1.56 markus 1611: debug("rekeying in progress");
1.284 djm 1612: } else if (need_rekeying) {
1613: /* manual rekey request */
1614: debug("need rekeying");
1615: if ((r = kex_start_rekex(active_state)) != 0)
1616: fatal("%s: kex_start_rekex: %s", __func__,
1617: ssh_err(r));
1618: need_rekeying = 0;
1.56 markus 1619: } else {
1620: /*
1621: * Make packets of buffered stdin data, and buffer
1622: * them for sending to the server.
1623: */
1624: if (!compat20)
1625: client_make_packets_from_stdin_data();
1.11 markus 1626:
1.56 markus 1627: /*
1628: * Make packets from buffered channel data, and
1629: * enqueue them for sending to the server.
1630: */
1631: if (packet_not_very_much_data_to_write())
1632: channel_output_poll();
1.11 markus 1633:
1.56 markus 1634: /*
1635: * Check if the window size has changed, and buffer a
1636: * message about it to the server if so.
1637: */
1638: client_check_window_change();
1.11 markus 1639:
1.56 markus 1640: if (quit_pending)
1641: break;
1642: }
1.13 markus 1643: /*
1644: * Wait until we have something to do (something becomes
1645: * available on one of the descriptors).
1646: */
1.81 markus 1647: max_fd2 = max_fd;
1.56 markus 1648: client_wait_until_can_do_something(&readset, &writeset,
1.284 djm 1649: &max_fd2, &nalloc, ssh_packet_is_rekeying(active_state));
1.11 markus 1650:
1651: if (quit_pending)
1652: break;
1653:
1.56 markus 1654: /* Do channel operations unless rekeying in progress. */
1.284 djm 1655: if (!ssh_packet_is_rekeying(active_state))
1.56 markus 1656: channel_after_select(readset, writeset);
1.11 markus 1657:
1.17 markus 1658: /* Buffer input from the connection. */
1.46 markus 1659: client_process_net_input(readset);
1.17 markus 1660:
1661: if (quit_pending)
1662: break;
1.11 markus 1663:
1.17 markus 1664: if (!compat20) {
1665: /* Buffer data from stdin */
1.46 markus 1666: client_process_input(readset);
1.17 markus 1667: /*
1668: * Process output to stdout and stderr. Output to
1669: * the connection is processed elsewhere (above).
1670: */
1.46 markus 1671: client_process_output(writeset);
1.17 markus 1672: }
1.11 markus 1673:
1.197 djm 1674: /*
1675: * Send as much buffered packet data as possible to the
1676: * sender.
1677: */
1.46 markus 1678: if (FD_ISSET(connection_out, writeset))
1.11 markus 1679: packet_write_poll();
1.222 djm 1680:
1681: /*
1682: * If we are a backgrounded control master, and the
1683: * timeout has expired without any active client
1684: * connections, then quit.
1685: */
1686: if (control_persist_exit_time > 0) {
1.251 dtucker 1687: if (monotime() >= control_persist_exit_time) {
1.222 djm 1688: debug("ControlPersist timeout expired");
1689: break;
1690: }
1691: }
1.11 markus 1692: }
1.250 djm 1693: free(readset);
1694: free(writeset);
1.11 markus 1695:
1696: /* Terminate the session. */
1697:
1698: /* Stop watching for window change. */
1.132 djm 1699: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1700:
1.213 stevesk 1701: if (compat20) {
1702: packet_start(SSH2_MSG_DISCONNECT);
1703: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1704: packet_put_cstring("disconnected by user");
1.219 djm 1705: packet_put_cstring(""); /* language tag */
1.213 stevesk 1706: packet_send();
1707: packet_write_wait();
1708: }
1.11 markus 1709:
1.76 markus 1710: channel_free_all();
1.11 markus 1711:
1.75 markus 1712: if (have_pty)
1.233 djm 1713: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1714:
1715: /* restore blocking io */
1716: if (!isatty(fileno(stdin)))
1717: unset_nonblock(fileno(stdin));
1718: if (!isatty(fileno(stdout)))
1719: unset_nonblock(fileno(stdout));
1720: if (!isatty(fileno(stderr)))
1721: unset_nonblock(fileno(stderr));
1.116 dtucker 1722:
1723: /*
1724: * If there was no shell or command requested, there will be no remote
1725: * exit status to be returned. In that case, clear error code if the
1726: * connection was deliberately terminated at this end.
1727: */
1728: if (no_shell_flag && received_signal == SIGTERM) {
1729: received_signal = 0;
1730: exit_status = 0;
1731: }
1.75 markus 1732:
1.113 markus 1733: if (received_signal)
1.89 itojun 1734: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1735:
1.13 markus 1736: /*
1737: * In interactive mode (with pseudo tty) display a message indicating
1738: * that the connection has been closed.
1739: */
1.11 markus 1740: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1741: snprintf(buf, sizeof buf,
1742: "Connection to %.64s closed.\r\n", host);
1.11 markus 1743: buffer_append(&stderr_buffer, buf, strlen(buf));
1744: }
1.70 markus 1745:
1.11 markus 1746: /* Output any buffered data for stdout. */
1.231 djm 1747: if (buffer_len(&stdout_buffer) > 0) {
1.230 djm 1748: len = atomicio(vwrite, fileno(stdout),
1749: buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer));
1.231 djm 1750: if (len < 0 || (u_int)len != buffer_len(&stdout_buffer))
1.11 markus 1751: error("Write failed flushing stdout buffer.");
1.231 djm 1752: else
1753: buffer_consume(&stdout_buffer, len);
1.11 markus 1754: }
1755:
1756: /* Output any buffered data for stderr. */
1.231 djm 1757: if (buffer_len(&stderr_buffer) > 0) {
1.230 djm 1758: len = atomicio(vwrite, fileno(stderr),
1759: buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1.231 djm 1760: if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1.11 markus 1761: error("Write failed flushing stderr buffer.");
1.231 djm 1762: else
1763: buffer_consume(&stderr_buffer, len);
1.11 markus 1764: }
1765:
1766: /* Clear and free any buffers. */
1.281 jsg 1767: explicit_bzero(buf, sizeof(buf));
1.11 markus 1768: buffer_free(&stdin_buffer);
1769: buffer_free(&stdout_buffer);
1770: buffer_free(&stderr_buffer);
1771:
1772: /* Report bytes transferred, and transfer rates. */
1773: total_time = get_current_time() - start_time;
1.263 markus 1774: packet_get_bytes(&ibytes, &obytes);
1.200 markus 1775: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1776: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1777: if (total_time > 0)
1.200 markus 1778: verbose("Bytes per second: sent %.1f, received %.1f",
1779: obytes / total_time, ibytes / total_time);
1.11 markus 1780: /* Return the exit status of the program. */
1781: debug("Exit status %d", exit_status);
1782: return exit_status;
1.15 markus 1783: }
1784:
1785: /*********/
1786:
1.264 markus 1787: static int
1.94 markus 1788: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1789: {
1.42 markus 1790: u_int data_len;
1.15 markus 1791: char *data = packet_get_string(&data_len);
1.93 markus 1792: packet_check_eom();
1.15 markus 1793: buffer_append(&stdout_buffer, data, data_len);
1.258 djm 1794: explicit_bzero(data, data_len);
1.250 djm 1795: free(data);
1.264 markus 1796: return 0;
1.15 markus 1797: }
1.264 markus 1798: static int
1.94 markus 1799: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1800: {
1.42 markus 1801: u_int data_len;
1.15 markus 1802: char *data = packet_get_string(&data_len);
1.93 markus 1803: packet_check_eom();
1.15 markus 1804: buffer_append(&stderr_buffer, data, data_len);
1.258 djm 1805: explicit_bzero(data, data_len);
1.250 djm 1806: free(data);
1.264 markus 1807: return 0;
1.15 markus 1808: }
1.264 markus 1809: static int
1.94 markus 1810: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1811: {
1812: exit_status = packet_get_int();
1.93 markus 1813: packet_check_eom();
1.15 markus 1814: /* Acknowledge the exit. */
1815: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1816: packet_send();
1817: /*
1818: * Must wait for packet to be sent since we are
1819: * exiting the loop.
1820: */
1821: packet_write_wait();
1822: /* Flag that we want to exit. */
1823: quit_pending = 1;
1.264 markus 1824: return 0;
1.15 markus 1825: }
1.267 djm 1826:
1.264 markus 1827: static int
1.115 markus 1828: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1829: {
1830: Channel *c = NULL;
1.262 djm 1831: int r, remote_id, sock;
1.115 markus 1832:
1833: /* Read the remote channel number from the message. */
1834: remote_id = packet_get_int();
1835: packet_check_eom();
1836:
1837: /*
1838: * Get a connection to the local authentication agent (this may again
1839: * get forwarded).
1840: */
1.262 djm 1841: if ((r = ssh_get_authentication_socket(&sock)) != 0 &&
1842: r != SSH_ERR_AGENT_NOT_PRESENT)
1843: debug("%s: ssh_get_authentication_socket: %s",
1844: __func__, ssh_err(r));
1845:
1.115 markus 1846:
1847: /*
1848: * If we could not connect the agent, send an error message back to
1849: * the server. This should never happen unless the agent dies,
1850: * because authentication forwarding is only enabled if we have an
1851: * agent.
1852: */
1853: if (sock >= 0) {
1854: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1855: -1, 0, 0, 0, "authentication agent connection", 1);
1856: c->remote_id = remote_id;
1857: c->force_drain = 1;
1858: }
1859: if (c == NULL) {
1860: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1861: packet_put_int(remote_id);
1862: } else {
1863: /* Send a confirmation to the remote host. */
1864: debug("Forwarding authentication connection.");
1865: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1866: packet_put_int(remote_id);
1867: packet_put_int(c->self);
1868: }
1869: packet_send();
1.264 markus 1870: return 0;
1.115 markus 1871: }
1.15 markus 1872:
1.77 itojun 1873: static Channel *
1.289 markus 1874: client_request_forwarded_tcpip(const char *request_type, int rchan,
1875: u_int rwindow, u_int rmaxpack)
1.40 markus 1876: {
1.103 deraadt 1877: Channel *c = NULL;
1.289 markus 1878: struct sshbuf *b = NULL;
1.40 markus 1879: char *listen_address, *originator_address;
1.208 djm 1880: u_short listen_port, originator_port;
1.289 markus 1881: int r;
1.40 markus 1882:
1883: /* Get rest of the packet */
1884: listen_address = packet_get_string(NULL);
1885: listen_port = packet_get_int();
1886: originator_address = packet_get_string(NULL);
1887: originator_port = packet_get_int();
1.93 markus 1888: packet_check_eom();
1.40 markus 1889:
1.261 millert 1890: debug("%s: listen %s port %d, originator %s port %d", __func__,
1891: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1892:
1.260 markus 1893: c = channel_connect_by_listen_address(listen_address, listen_port,
1.191 djm 1894: "forwarded-tcpip", originator_address);
1.40 markus 1895:
1.289 markus 1896: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1897: if ((b = sshbuf_new()) == NULL) {
1898: error("%s: alloc reply", __func__);
1899: goto out;
1900: }
1901: /* reconstruct and send to muxclient */
1902: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1903: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1904: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1905: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1906: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1907: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1908: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1909: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1910: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1911: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1912: (r = sshbuf_put_stringb(&c->output, b)) != 0) {
1913: error("%s: compose for muxclient %s", __func__,
1914: ssh_err(r));
1915: goto out;
1916: }
1917: }
1918:
1919: out:
1920: sshbuf_free(b);
1.250 djm 1921: free(originator_address);
1922: free(listen_address);
1.40 markus 1923: return c;
1924: }
1925:
1.103 deraadt 1926: static Channel *
1.261 millert 1927: client_request_forwarded_streamlocal(const char *request_type, int rchan)
1928: {
1929: Channel *c = NULL;
1930: char *listen_path;
1931:
1932: /* Get the remote path. */
1933: listen_path = packet_get_string(NULL);
1934: /* XXX: Skip reserved field for now. */
1935: if (packet_get_string_ptr(NULL) == NULL)
1936: fatal("%s: packet_get_string_ptr failed", __func__);
1937: packet_check_eom();
1938:
1939: debug("%s: %s", __func__, listen_path);
1940:
1941: c = channel_connect_by_listen_path(listen_path,
1942: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1943: free(listen_path);
1944: return c;
1945: }
1946:
1947: static Channel *
1.40 markus 1948: client_request_x11(const char *request_type, int rchan)
1949: {
1950: Channel *c = NULL;
1951: char *originator;
1.208 djm 1952: u_short originator_port;
1.67 markus 1953: int sock;
1.40 markus 1954:
1955: if (!options.forward_x11) {
1956: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1957: error("Warning: this is probably a break-in attempt by a "
1958: "malicious server.");
1.221 djm 1959: return NULL;
1960: }
1.274 djm 1961: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1962: verbose("Rejected X11 connection after ForwardX11Timeout "
1963: "expired");
1.40 markus 1964: return NULL;
1965: }
1966: originator = packet_get_string(NULL);
1967: if (datafellows & SSH_BUG_X11FWD) {
1968: debug2("buggy server: x11 request w/o originator_port");
1969: originator_port = 0;
1970: } else {
1971: originator_port = packet_get_int();
1972: }
1.93 markus 1973: packet_check_eom();
1.40 markus 1974: /* XXX check permission */
1.47 markus 1975: debug("client_request_x11: request from %s %d", originator,
1976: originator_port);
1.250 djm 1977: free(originator);
1.40 markus 1978: sock = x11_connect_display();
1.67 markus 1979: if (sock < 0)
1980: return NULL;
1981: c = channel_new("x11",
1982: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1983: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1984: c->force_drain = 1;
1.40 markus 1985: return c;
1986: }
1987:
1.103 deraadt 1988: static Channel *
1.40 markus 1989: client_request_agent(const char *request_type, int rchan)
1990: {
1991: Channel *c = NULL;
1.262 djm 1992: int r, sock;
1.40 markus 1993:
1994: if (!options.forward_agent) {
1995: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1996: error("Warning: this is probably a break-in attempt by a "
1997: "malicious server.");
1.40 markus 1998: return NULL;
1999: }
1.262 djm 2000: if ((r = ssh_get_authentication_socket(&sock)) != 0) {
2001: if (r != SSH_ERR_AGENT_NOT_PRESENT)
2002: debug("%s: ssh_get_authentication_socket: %s",
2003: __func__, ssh_err(r));
1.67 markus 2004: return NULL;
1.262 djm 2005: }
1.67 markus 2006: c = channel_new("authentication agent connection",
2007: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 2008: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 2009: "authentication agent connection", 1);
1.82 markus 2010: c->force_drain = 1;
1.40 markus 2011: return c;
1.180 djm 2012: }
2013:
2014: int
2015: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
2016: {
2017: Channel *c;
2018: int fd;
2019:
2020: if (tun_mode == SSH_TUNMODE_NO)
2021: return 0;
2022:
2023: if (!compat20) {
1.207 stevesk 2024: error("Tunnel forwarding is not supported for protocol 1");
1.180 djm 2025: return -1;
2026: }
2027:
2028: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
2029:
2030: /* Open local tunnel device */
2031: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
2032: error("Tunnel device open failed.");
2033: return -1;
2034: }
2035:
2036: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
2037: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
2038: c->datagram = 1;
2039:
2040: packet_start(SSH2_MSG_CHANNEL_OPEN);
2041: packet_put_cstring("tun@openssh.com");
2042: packet_put_int(c->self);
2043: packet_put_int(c->local_window_max);
2044: packet_put_int(c->local_maxpacket);
2045: packet_put_int(tun_mode);
2046: packet_put_int(remote_tun);
2047: packet_send();
2048:
2049: return 0;
1.40 markus 2050: }
2051:
1.22 markus 2052: /* XXXX move to generic input handler */
1.264 markus 2053: static int
1.94 markus 2054: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 2055: {
2056: Channel *c = NULL;
2057: char *ctype;
2058: int rchan;
1.102 markus 2059: u_int rmaxpack, rwindow, len;
1.22 markus 2060:
2061: ctype = packet_get_string(&len);
2062: rchan = packet_get_int();
2063: rwindow = packet_get_int();
2064: rmaxpack = packet_get_int();
2065:
1.24 markus 2066: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 2067: ctype, rchan, rwindow, rmaxpack);
2068:
1.40 markus 2069: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.289 markus 2070: c = client_request_forwarded_tcpip(ctype, rchan, rwindow,
2071: rmaxpack);
1.261 millert 2072: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
2073: c = client_request_forwarded_streamlocal(ctype, rchan);
1.40 markus 2074: } else if (strcmp(ctype, "x11") == 0) {
2075: c = client_request_x11(ctype, rchan);
2076: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
2077: c = client_request_agent(ctype, rchan);
1.22 markus 2078: }
1.289 markus 2079: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
2080: debug3("proxied to downstream: %s", ctype);
2081: } else if (c != NULL) {
1.22 markus 2082: debug("confirm %s", ctype);
2083: c->remote_id = rchan;
2084: c->remote_window = rwindow;
2085: c->remote_maxpacket = rmaxpack;
1.69 markus 2086: if (c->type != SSH_CHANNEL_CONNECTING) {
2087: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
2088: packet_put_int(c->remote_id);
2089: packet_put_int(c->self);
2090: packet_put_int(c->local_window);
2091: packet_put_int(c->local_maxpacket);
2092: packet_send();
2093: }
1.22 markus 2094: } else {
2095: debug("failure %s", ctype);
2096: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
2097: packet_put_int(rchan);
2098: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 2099: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 2100: packet_put_cstring("open failed");
1.66 markus 2101: packet_put_cstring("");
2102: }
1.22 markus 2103: packet_send();
2104: }
1.250 djm 2105: free(ctype);
1.264 markus 2106: return 0;
1.22 markus 2107: }
1.267 djm 2108:
1.264 markus 2109: static int
1.94 markus 2110: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 2111: {
2112: Channel *c = NULL;
1.123 djm 2113: int exitval, id, reply, success = 0;
1.48 markus 2114: char *rtype;
2115:
2116: id = packet_get_int();
1.289 markus 2117: c = channel_lookup(id);
2118: if (channel_proxy_upstream(c, type, seq, ctxt))
2119: return 0;
1.48 markus 2120: rtype = packet_get_string(NULL);
2121: reply = packet_get_char();
2122:
2123: debug("client_input_channel_req: channel %d rtype %s reply %d",
2124: id, rtype, reply);
2125:
1.128 djm 2126: if (id == -1) {
2127: error("client_input_channel_req: request for channel -1");
1.289 markus 2128: } else if (c == NULL) {
1.197 djm 2129: error("client_input_channel_req: channel %d: "
2130: "unknown channel", id);
1.193 markus 2131: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
2132: packet_check_eom();
2133: chan_rcvd_eow(c);
1.48 markus 2134: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 2135: exitval = packet_get_int();
1.217 djm 2136: if (c->ctl_chan != -1) {
2137: mux_exit_message(c, exitval);
1.215 djm 2138: success = 1;
2139: } else if (id == session_ident) {
2140: /* Record exit value of local session */
1.123 djm 2141: success = 1;
2142: exit_status = exitval;
1.215 djm 2143: } else {
1.218 djm 2144: /* Probably for a mux channel that has already closed */
2145: debug("%s: no sink for exit-status on channel %d",
2146: __func__, id);
1.123 djm 2147: }
1.93 markus 2148: packet_check_eom();
1.48 markus 2149: }
1.259 djm 2150: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.48 markus 2151: packet_start(success ?
2152: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 2153: packet_put_int(c->remote_id);
1.48 markus 2154: packet_send();
2155: }
1.250 djm 2156: free(rtype);
1.264 markus 2157: return 0;
1.48 markus 2158: }
1.267 djm 2159:
1.269 djm 2160: struct hostkeys_update_ctx {
2161: /* The hostname and (optionally) IP address string for the server */
2162: char *host_str, *ip_str;
2163:
2164: /*
2165: * Keys received from the server and a flag for each indicating
2166: * whether they already exist in known_hosts.
2167: * keys_seen is filled in by hostkeys_find() and later (for new
2168: * keys) by client_global_hostkeys_private_confirm().
2169: */
2170: struct sshkey **keys;
2171: int *keys_seen;
2172: size_t nkeys;
2173:
2174: size_t nnew;
2175:
2176: /*
2177: * Keys that are in known_hosts, but were not present in the update
2178: * from the server (i.e. scheduled to be deleted).
2179: * Filled in by hostkeys_find().
2180: */
2181: struct sshkey **old_keys;
2182: size_t nold;
2183: };
2184:
2185: static void
2186: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
2187: {
2188: size_t i;
2189:
2190: if (ctx == NULL)
2191: return;
2192: for (i = 0; i < ctx->nkeys; i++)
2193: sshkey_free(ctx->keys[i]);
2194: free(ctx->keys);
2195: free(ctx->keys_seen);
2196: for (i = 0; i < ctx->nold; i++)
2197: sshkey_free(ctx->old_keys[i]);
2198: free(ctx->old_keys);
2199: free(ctx->host_str);
2200: free(ctx->ip_str);
2201: free(ctx);
2202: }
2203:
2204: static int
2205: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
2206: {
2207: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2208: size_t i;
2209: struct sshkey **tmp;
2210:
2211: if (l->status != HKF_STATUS_MATCHED || l->key == NULL ||
2212: l->key->type == KEY_RSA1)
2213: return 0;
2214:
2215: /* Mark off keys we've already seen for this host */
2216: for (i = 0; i < ctx->nkeys; i++) {
2217: if (sshkey_equal(l->key, ctx->keys[i])) {
2218: debug3("%s: found %s key at %s:%ld", __func__,
2219: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
2220: ctx->keys_seen[i] = 1;
2221: return 0;
2222: }
2223: }
2224: /* This line contained a key that not offered by the server */
2225: debug3("%s: deprecated %s key at %s:%ld", __func__,
2226: sshkey_ssh_name(l->key), l->path, l->linenum);
2227: if ((tmp = reallocarray(ctx->old_keys, ctx->nold + 1,
2228: sizeof(*ctx->old_keys))) == NULL)
2229: fatal("%s: reallocarray failed nold = %zu",
2230: __func__, ctx->nold);
2231: ctx->old_keys = tmp;
2232: ctx->old_keys[ctx->nold++] = l->key;
2233: l->key = NULL;
2234:
2235: return 0;
2236: }
2237:
2238: static void
2239: update_known_hosts(struct hostkeys_update_ctx *ctx)
2240: {
1.271 djm 2241: int r, was_raw = 0;
2242: int loglevel = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK ?
1.269 djm 2243: SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
2244: char *fp, *response;
2245: size_t i;
2246:
2247: for (i = 0; i < ctx->nkeys; i++) {
2248: if (ctx->keys_seen[i] != 2)
2249: continue;
2250: if ((fp = sshkey_fingerprint(ctx->keys[i],
2251: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2252: fatal("%s: sshkey_fingerprint failed", __func__);
2253: do_log2(loglevel, "Learned new hostkey: %s %s",
2254: sshkey_type(ctx->keys[i]), fp);
2255: free(fp);
2256: }
2257: for (i = 0; i < ctx->nold; i++) {
2258: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2259: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2260: fatal("%s: sshkey_fingerprint failed", __func__);
2261: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2262: sshkey_type(ctx->old_keys[i]), fp);
2263: free(fp);
2264: }
2265: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2266: if (get_saved_tio() != NULL) {
2267: leave_raw_mode(1);
2268: was_raw = 1;
2269: }
1.269 djm 2270: response = NULL;
2271: for (i = 0; !quit_pending && i < 3; i++) {
2272: free(response);
2273: response = read_passphrase("Accept updated hostkeys? "
2274: "(yes/no): ", RP_ECHO);
2275: if (strcasecmp(response, "yes") == 0)
2276: break;
2277: else if (quit_pending || response == NULL ||
2278: strcasecmp(response, "no") == 0) {
2279: options.update_hostkeys = 0;
2280: break;
2281: } else {
2282: do_log2(loglevel, "Please enter "
2283: "\"yes\" or \"no\"");
2284: }
2285: }
2286: if (quit_pending || i >= 3 || response == NULL)
2287: options.update_hostkeys = 0;
2288: free(response);
1.271 djm 2289: if (was_raw)
2290: enter_raw_mode(1);
1.269 djm 2291: }
2292:
2293: /*
2294: * Now that all the keys are verified, we can go ahead and replace
2295: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2296: * cancel the operation).
2297: */
2298: if (options.update_hostkeys != 0 &&
2299: (r = hostfile_replace_entries(options.user_hostfiles[0],
2300: ctx->host_str, ctx->ip_str, ctx->keys, ctx->nkeys,
2301: options.hash_known_hosts, 0,
2302: options.fingerprint_hash)) != 0)
2303: error("%s: hostfile_replace_entries failed: %s",
2304: __func__, ssh_err(r));
2305: }
2306:
2307: static void
2308: client_global_hostkeys_private_confirm(int type, u_int32_t seq, void *_ctx)
2309: {
2310: struct ssh *ssh = active_state; /* XXX */
2311: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2312: size_t i, ndone;
2313: struct sshbuf *signdata;
2314: int r;
2315: const u_char *sig;
2316: size_t siglen;
2317:
2318: if (ctx->nnew == 0)
2319: fatal("%s: ctx->nnew == 0", __func__); /* sanity */
2320: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2321: error("Server failed to confirm ownership of "
2322: "private host keys");
2323: hostkeys_update_ctx_free(ctx);
2324: return;
2325: }
2326: if ((signdata = sshbuf_new()) == NULL)
2327: fatal("%s: sshbuf_new failed", __func__);
2328: /* Don't want to accidentally accept an unbound signature */
2329: if (ssh->kex->session_id_len == 0)
2330: fatal("%s: ssh->kex->session_id_len == 0", __func__);
2331: /*
2332: * Expect a signature for each of the ctx->nnew private keys we
2333: * haven't seen before. They will be in the same order as the
2334: * ctx->keys where the corresponding ctx->keys_seen[i] == 0.
2335: */
2336: for (ndone = i = 0; i < ctx->nkeys; i++) {
2337: if (ctx->keys_seen[i])
2338: continue;
2339: /* Prepare data to be signed: session ID, unique string, key */
2340: sshbuf_reset(signdata);
1.270 djm 2341: if ( (r = sshbuf_put_cstring(signdata,
2342: "hostkeys-prove-00@openssh.com")) != 0 ||
2343: (r = sshbuf_put_string(signdata, ssh->kex->session_id,
1.269 djm 2344: ssh->kex->session_id_len)) != 0 ||
2345: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
2346: fatal("%s: failed to prepare signature: %s",
2347: __func__, ssh_err(r));
2348: /* Extract and verify signature */
2349: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
2350: error("%s: couldn't parse message: %s",
2351: __func__, ssh_err(r));
2352: goto out;
2353: }
2354: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
2355: sshbuf_ptr(signdata), sshbuf_len(signdata), 0)) != 0) {
2356: error("%s: server gave bad signature for %s key %zu",
2357: __func__, sshkey_type(ctx->keys[i]), i);
2358: goto out;
2359: }
2360: /* Key is good. Mark it as 'seen' */
2361: ctx->keys_seen[i] = 2;
2362: ndone++;
2363: }
2364: if (ndone != ctx->nnew)
2365: fatal("%s: ndone != ctx->nnew (%zu / %zu)", __func__,
2366: ndone, ctx->nnew); /* Shouldn't happen */
2367: ssh_packet_check_eom(ssh);
2368:
2369: /* Make the edits to known_hosts */
2370: update_known_hosts(ctx);
2371: out:
2372: hostkeys_update_ctx_free(ctx);
2373: }
2374:
1.267 djm 2375: /*
1.270 djm 2376: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2377: * the server's hostkeys. The keys are checked against the user's
2378: * HostkeyAlgorithms preference before they are accepted.
2379: */
2380: static int
2381: client_input_hostkeys(void)
2382: {
1.269 djm 2383: struct ssh *ssh = active_state; /* XXX */
1.267 djm 2384: const u_char *blob = NULL;
1.269 djm 2385: size_t i, len = 0;
1.267 djm 2386: struct sshbuf *buf = NULL;
1.269 djm 2387: struct sshkey *key = NULL, **tmp;
2388: int r;
2389: char *fp;
1.267 djm 2390: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2391: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2392: struct hostkeys_update_ctx *ctx = NULL;
1.267 djm 2393:
2394: if (hostkeys_seen)
2395: fatal("%s: server already sent hostkeys", __func__);
1.269 djm 2396: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2397: options.batch_mode)
2398: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2399: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2400: return 1;
1.272 djm 2401:
2402: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2403: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2404: sshkey_free(key);
2405: key = NULL;
1.269 djm 2406: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
2407: error("%s: couldn't parse message: %s",
2408: __func__, ssh_err(r));
2409: goto out;
2410: }
1.270 djm 2411: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
2412: error("%s: parse key: %s", __func__, ssh_err(r));
2413: goto out;
2414: }
1.267 djm 2415: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2416: SSH_FP_DEFAULT);
2417: debug3("%s: received %s key %s", __func__,
2418: sshkey_type(key), fp);
2419: free(fp);
1.275 markus 2420:
1.267 djm 2421: /* Check that the key is accepted in HostkeyAlgorithms */
1.275 markus 2422: if (match_pattern_list(sshkey_ssh_name(key),
2423: options.hostkeyalgorithms ? options.hostkeyalgorithms :
2424: KEX_DEFAULT_PK_ALG, 0) != 1) {
1.267 djm 2425: debug3("%s: %s key not permitted by HostkeyAlgorithms",
2426: __func__, sshkey_ssh_name(key));
2427: continue;
2428: }
1.269 djm 2429: /* Skip certs */
2430: if (sshkey_is_cert(key)) {
2431: debug3("%s: %s key is a certificate; skipping",
2432: __func__, sshkey_ssh_name(key));
2433: continue;
2434: }
2435: /* Ensure keys are unique */
2436: for (i = 0; i < ctx->nkeys; i++) {
2437: if (sshkey_equal(key, ctx->keys[i])) {
2438: error("%s: received duplicated %s host key",
2439: __func__, sshkey_ssh_name(key));
2440: goto out;
2441: }
2442: }
2443: /* Key is good, record it */
2444: if ((tmp = reallocarray(ctx->keys, ctx->nkeys + 1,
2445: sizeof(*ctx->keys))) == NULL)
2446: fatal("%s: reallocarray failed nkeys = %zu",
2447: __func__, ctx->nkeys);
2448: ctx->keys = tmp;
2449: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2450: key = NULL;
2451: }
2452:
1.269 djm 2453: if (ctx->nkeys == 0) {
1.270 djm 2454: debug("%s: server sent no hostkeys", __func__);
1.267 djm 2455: goto out;
2456: }
1.270 djm 2457:
1.269 djm 2458: if ((ctx->keys_seen = calloc(ctx->nkeys,
2459: sizeof(*ctx->keys_seen))) == NULL)
2460: fatal("%s: calloc failed", __func__);
1.267 djm 2461:
1.268 djm 2462: get_hostfile_hostname_ipaddr(host,
2463: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2464: options.port, &ctx->host_str,
2465: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2466:
1.269 djm 2467: /* Find which keys we already know about. */
2468: if ((r = hostkeys_foreach(options.user_hostfiles[0], hostkeys_find,
2469: ctx, ctx->host_str, ctx->ip_str,
2470: HKF_WANT_PARSE_KEY|HKF_WANT_MATCH)) != 0) {
2471: error("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1.267 djm 2472: goto out;
2473: }
2474:
1.269 djm 2475: /* Figure out if we have any new keys to add */
2476: ctx->nnew = 0;
2477: for (i = 0; i < ctx->nkeys; i++) {
2478: if (!ctx->keys_seen[i])
2479: ctx->nnew++;
2480: }
2481:
2482: debug3("%s: %zu keys from server: %zu new, %zu retained. %zu to remove",
2483: __func__, ctx->nkeys, ctx->nnew, ctx->nkeys - ctx->nnew, ctx->nold);
2484:
2485: if (ctx->nnew == 0 && ctx->nold != 0) {
2486: /* We have some keys to remove. Just do it. */
2487: update_known_hosts(ctx);
2488: } else if (ctx->nnew != 0) {
2489: /*
2490: * We have received hitherto-unseen keys from the server.
2491: * Ask the server to confirm ownership of the private halves.
2492: */
2493: debug3("%s: asking server to prove ownership for %zu keys",
2494: __func__, ctx->nnew);
2495: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2496: (r = sshpkt_put_cstring(ssh,
1.270 djm 2497: "hostkeys-prove-00@openssh.com")) != 0 ||
1.269 djm 2498: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
2499: fatal("%s: cannot prepare packet: %s",
2500: __func__, ssh_err(r));
2501: if ((buf = sshbuf_new()) == NULL)
2502: fatal("%s: sshbuf_new", __func__);
2503: for (i = 0; i < ctx->nkeys; i++) {
2504: if (ctx->keys_seen[i])
2505: continue;
2506: sshbuf_reset(buf);
2507: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0)
2508: fatal("%s: sshkey_putb: %s",
2509: __func__, ssh_err(r));
2510: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
2511: fatal("%s: sshpkt_put_string: %s",
2512: __func__, ssh_err(r));
2513: }
2514: if ((r = sshpkt_send(ssh)) != 0)
2515: fatal("%s: sshpkt_send: %s", __func__, ssh_err(r));
2516: client_register_global_confirm(
2517: client_global_hostkeys_private_confirm, ctx);
2518: ctx = NULL; /* will be freed in callback */
2519: }
2520:
1.267 djm 2521: /* Success */
2522: out:
1.269 djm 2523: hostkeys_update_ctx_free(ctx);
1.267 djm 2524: sshkey_free(key);
2525: sshbuf_free(buf);
1.269 djm 2526: /*
2527: * NB. Return success for all cases. The server doesn't need to know
2528: * what the client does with its hosts file.
2529: */
2530: return 1;
1.267 djm 2531: }
2532:
1.264 markus 2533: static int
1.95 markus 2534: client_input_global_request(int type, u_int32_t seq, void *ctxt)
2535: {
2536: char *rtype;
2537: int want_reply;
2538: int success = 0;
2539:
1.267 djm 2540: rtype = packet_get_cstring(NULL);
1.95 markus 2541: want_reply = packet_get_char();
1.117 markus 2542: debug("client_input_global_request: rtype %s want_reply %d",
2543: rtype, want_reply);
1.270 djm 2544: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.267 djm 2545: success = client_input_hostkeys();
1.95 markus 2546: if (want_reply) {
2547: packet_start(success ?
2548: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
2549: packet_send();
2550: packet_write_wait();
2551: }
1.250 djm 2552: free(rtype);
1.264 markus 2553: return 0;
1.95 markus 2554: }
1.22 markus 2555:
1.123 djm 2556: void
1.129 deraadt 2557: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 2558: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 2559: {
2560: int len;
1.132 djm 2561: Channel *c = NULL;
1.123 djm 2562:
2563: debug2("%s: id %d", __func__, id);
2564:
1.132 djm 2565: if ((c = channel_lookup(id)) == NULL)
2566: fatal("client_session2_setup: channel %d: unknown channel", id);
1.224 djm 2567:
2568: packet_set_interactive(want_tty,
2569: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2570:
1.123 djm 2571: if (want_tty) {
2572: struct winsize ws;
2573:
2574: /* Store window size in the packet. */
2575: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2576: memset(&ws, 0, sizeof(ws));
2577:
1.190 djm 2578: channel_request_start(id, "pty-req", 1);
1.234 djm 2579: client_expect_confirm(id, "PTY allocation", CONFIRM_TTY);
1.123 djm 2580: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 2581: packet_put_int((u_int)ws.ws_col);
2582: packet_put_int((u_int)ws.ws_row);
2583: packet_put_int((u_int)ws.ws_xpixel);
2584: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 2585: if (tiop == NULL)
2586: tiop = get_saved_tio();
2587: tty_make_modes(-1, tiop);
1.123 djm 2588: packet_send();
2589: /* XXX wait for reply */
1.132 djm 2590: c->client_tty = 1;
1.123 djm 2591: }
2592:
2593: /* Transfer any environment variables from client to server */
1.126 djm 2594: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2595: int i, j, matched;
2596: char *name, *val;
2597:
2598: debug("Sending environment.");
1.126 djm 2599: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2600: /* Split */
1.126 djm 2601: name = xstrdup(env[i]);
1.123 djm 2602: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2603: free(name);
1.123 djm 2604: continue;
2605: }
2606: *val++ = '\0';
2607:
2608: matched = 0;
2609: for (j = 0; j < options.num_send_env; j++) {
2610: if (match_pattern(name, options.send_env[j])) {
2611: matched = 1;
2612: break;
2613: }
2614: }
2615: if (!matched) {
2616: debug3("Ignored env %s", name);
1.250 djm 2617: free(name);
1.123 djm 2618: continue;
2619: }
2620:
2621: debug("Sending env %s = %s", name, val);
2622: channel_request_start(id, "env", 0);
2623: packet_put_cstring(name);
2624: packet_put_cstring(val);
2625: packet_send();
1.250 djm 2626: free(name);
1.123 djm 2627: }
2628: }
2629:
2630: len = buffer_len(cmd);
2631: if (len > 0) {
2632: if (len > 900)
2633: len = 900;
2634: if (want_subsystem) {
1.190 djm 2635: debug("Sending subsystem: %.*s",
2636: len, (u_char*)buffer_ptr(cmd));
2637: channel_request_start(id, "subsystem", 1);
1.234 djm 2638: client_expect_confirm(id, "subsystem", CONFIRM_CLOSE);
1.123 djm 2639: } else {
1.190 djm 2640: debug("Sending command: %.*s",
2641: len, (u_char*)buffer_ptr(cmd));
2642: channel_request_start(id, "exec", 1);
1.234 djm 2643: client_expect_confirm(id, "exec", CONFIRM_CLOSE);
1.123 djm 2644: }
2645: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2646: packet_send();
2647: } else {
1.190 djm 2648: channel_request_start(id, "shell", 1);
1.234 djm 2649: client_expect_confirm(id, "shell", CONFIRM_CLOSE);
1.123 djm 2650: packet_send();
2651: }
2652: }
2653:
1.77 itojun 2654: static void
1.49 itojun 2655: client_init_dispatch_20(void)
1.16 markus 2656: {
1.55 markus 2657: dispatch_init(&dispatch_protocol_error);
1.100 markus 2658:
1.16 markus 2659: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2660: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2661: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2662: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2663: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2664: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2665: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2666: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2667: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2668: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2669: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2670: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2671:
2672: /* rekeying */
2673: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2674:
2675: /* global request reply messages */
2676: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2677: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 2678: }
1.197 djm 2679:
1.77 itojun 2680: static void
1.49 itojun 2681: client_init_dispatch_13(void)
1.15 markus 2682: {
2683: dispatch_init(NULL);
2684: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2685: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2686: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2687: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2688: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2689: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2690: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2691: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2692: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2693:
2694: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2695: &client_input_agent_open : &deny_input_open);
1.39 markus 2696: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2697: &x11_input_open : &deny_input_open);
1.15 markus 2698: }
1.197 djm 2699:
1.77 itojun 2700: static void
1.49 itojun 2701: client_init_dispatch_15(void)
1.15 markus 2702: {
2703: client_init_dispatch_13();
2704: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2705: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2706: }
1.197 djm 2707:
1.79 stevesk 2708: static void
1.49 itojun 2709: client_init_dispatch(void)
1.15 markus 2710: {
1.16 markus 2711: if (compat20)
2712: client_init_dispatch_20();
2713: else if (compat13)
1.15 markus 2714: client_init_dispatch_13();
2715: else
2716: client_init_dispatch_15();
1.232 djm 2717: }
2718:
2719: void
2720: client_stop_mux(void)
2721: {
2722: if (options.control_path != NULL && muxserver_sock != -1)
2723: unlink(options.control_path);
2724: /*
1.247 dtucker 2725: * If we are in persist mode, or don't have a shell, signal that we
2726: * should close when all active channels are closed.
1.232 djm 2727: */
1.247 dtucker 2728: if (options.control_persist || no_shell_flag) {
1.232 djm 2729: session_closed = 1;
1.235 djm 2730: setproctitle("[stopped mux]");
2731: }
1.113 markus 2732: }
2733:
2734: /* client specific fatal cleanup */
2735: void
1.114 markus 2736: cleanup_exit(int i)
1.113 markus 2737: {
1.233 djm 2738: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2739: leave_non_blocking();
1.192 djm 2740: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2741: unlink(options.control_path);
1.223 djm 2742: ssh_kill_proxy_command();
1.114 markus 2743: _exit(i);
1.1 deraadt 2744: }