Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.275.2.2
1.275.2.2! sthen 1: /* $OpenBSD: clientloop.c,v 1.275.2.1 2016/01/14 11:50:37 sthen Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.266 deraadt 63: #include <sys/param.h> /* MIN MAX */
1.175 deraadt 64: #include <sys/types.h>
1.152 stevesk 65: #include <sys/ioctl.h>
1.154 stevesk 66: #include <sys/stat.h>
1.166 stevesk 67: #include <sys/socket.h>
1.171 stevesk 68: #include <sys/time.h>
1.189 djm 69: #include <sys/queue.h>
1.150 stevesk 70:
1.155 stevesk 71: #include <ctype.h>
1.168 stevesk 72: #include <errno.h>
1.151 stevesk 73: #include <paths.h>
1.153 stevesk 74: #include <signal.h>
1.174 stevesk 75: #include <stdio.h>
1.173 stevesk 76: #include <stdlib.h>
1.170 stevesk 77: #include <string.h>
1.150 stevesk 78: #include <termios.h>
1.175 deraadt 79: #include <pwd.h>
1.169 stevesk 80: #include <unistd.h>
1.266 deraadt 81: #include <limits.h>
1.1 deraadt 82:
1.175 deraadt 83: #include "xmalloc.h"
1.45 markus 84: #include "ssh.h"
85: #include "ssh1.h"
86: #include "ssh2.h"
1.1 deraadt 87: #include "packet.h"
88: #include "buffer.h"
1.15 markus 89: #include "compat.h"
1.74 markus 90: #include "channels.h"
1.15 markus 91: #include "dispatch.h"
1.40 markus 92: #include "key.h"
1.175 deraadt 93: #include "cipher.h"
1.54 markus 94: #include "kex.h"
1.275 markus 95: #include "myproposal.h"
1.45 markus 96: #include "log.h"
1.261 millert 97: #include "misc.h"
1.45 markus 98: #include "readconf.h"
99: #include "clientloop.h"
1.147 djm 100: #include "sshconnect.h"
1.40 markus 101: #include "authfd.h"
1.45 markus 102: #include "atomicio.h"
1.118 deraadt 103: #include "sshpty.h"
1.123 djm 104: #include "match.h"
105: #include "msg.h"
1.212 andreas 106: #include "roaming.h"
1.262 djm 107: #include "ssherr.h"
1.267 djm 108: #include "hostfile.h"
1.39 markus 109:
110: /* import options */
111: extern Options options;
112:
1.1 deraadt 113: /* Flag indicating that stdin should be redirected from /dev/null. */
114: extern int stdin_null_flag;
115:
1.116 dtucker 116: /* Flag indicating that no shell has been requested */
117: extern int no_shell_flag;
118:
1.123 djm 119: /* Control socket */
1.217 djm 120: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 121:
1.13 markus 122: /*
123: * Name of the host we are connecting to. This is the name given on the
124: * command line, or the HostName specified for the user-supplied name in a
125: * configuration file.
126: */
1.1 deraadt 127: extern char *host;
128:
1.13 markus 129: /*
130: * Flag to indicate that we have received a window change signal which has
131: * not yet been processed. This will cause a message indicating the new
132: * window size to be sent to the server a little later. This is volatile
133: * because this is updated in a signal handler.
134: */
1.88 markus 135: static volatile sig_atomic_t received_window_change_signal = 0;
136: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 137:
1.145 djm 138: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 139: static int in_non_blocking_mode = 0;
140:
1.222 djm 141: /* Time when backgrounded control master using ControlPersist should exit */
142: static time_t control_persist_exit_time = 0;
143:
1.1 deraadt 144: /* Common data for the client loop code. */
1.217 djm 145: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.195 djm 146: static int escape_char1; /* Escape character. (proto1 only) */
147: static int escape_pending1; /* Last character was an escape (proto1 only) */
1.11 markus 148: static int last_was_cr; /* Last character was a newline. */
1.197 djm 149: static int exit_status; /* Used to store the command exit status. */
150: static int stdin_eof; /* EOF has been encountered on stderr. */
1.11 markus 151: static Buffer stdin_buffer; /* Buffer for stdin data. */
152: static Buffer stdout_buffer; /* Buffer for stdout data. */
153: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.221 djm 154: static u_int buffer_high; /* Soft max buffer size. */
1.11 markus 155: static int connection_in; /* Connection to server (input). */
156: static int connection_out; /* Connection to server (output). */
1.56 markus 157: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 158: static int session_closed; /* In SSH2: login session closed. */
1.274 djm 159: static u_int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.1 deraadt 160:
1.77 itojun 161: static void client_init_dispatch(void);
1.16 markus 162: int session_ident = -1;
163:
1.214 andreas 164: int session_resumed = 0;
165:
1.195 djm 166: /* Track escape per proto2 channel */
167: struct escape_filter_ctx {
168: int escape_pending;
169: int escape_char;
170: };
171:
172: /* Context for channel confirmation replies */
1.190 djm 173: struct channel_reply_ctx {
174: const char *request_type;
1.234 djm 175: int id;
176: enum confirm_action action;
1.190 djm 177: };
178:
1.196 djm 179: /* Global request success/failure callbacks */
180: struct global_confirm {
181: TAILQ_ENTRY(global_confirm) entry;
182: global_confirm_cb *cb;
183: void *ctx;
184: int ref_count;
185: };
186: TAILQ_HEAD(global_confirms, global_confirm);
187: static struct global_confirms global_confirms =
188: TAILQ_HEAD_INITIALIZER(global_confirms);
189:
1.123 djm 190: void ssh_process_session2_setup(int, int, int, Buffer *);
191:
1.1 deraadt 192: /* Restores stdin to blocking mode. */
193:
1.77 itojun 194: static void
1.49 itojun 195: leave_non_blocking(void)
1.1 deraadt 196: {
1.11 markus 197: if (in_non_blocking_mode) {
1.125 djm 198: unset_nonblock(fileno(stdin));
1.11 markus 199: in_non_blocking_mode = 0;
200: }
1.1 deraadt 201: }
202:
1.11 markus 203: /* Puts stdin terminal in non-blocking mode. */
204:
1.77 itojun 205: static void
1.49 itojun 206: enter_non_blocking(void)
1.1 deraadt 207: {
1.11 markus 208: in_non_blocking_mode = 1;
1.124 djm 209: set_nonblock(fileno(stdin));
1.1 deraadt 210: }
211:
1.13 markus 212: /*
213: * Signal handler for the window change signal (SIGWINCH). This just sets a
214: * flag indicating that the window has changed.
215: */
1.157 deraadt 216: /*ARGSUSED */
1.77 itojun 217: static void
1.11 markus 218: window_change_handler(int sig)
1.1 deraadt 219: {
1.11 markus 220: received_window_change_signal = 1;
221: signal(SIGWINCH, window_change_handler);
1.1 deraadt 222: }
223:
1.13 markus 224: /*
225: * Signal handler for signals that cause the program to terminate. These
226: * signals must be trapped to restore terminal modes.
227: */
1.157 deraadt 228: /*ARGSUSED */
1.77 itojun 229: static void
1.11 markus 230: signal_handler(int sig)
1.1 deraadt 231: {
1.75 markus 232: received_signal = sig;
233: quit_pending = 1;
1.1 deraadt 234: }
235:
1.13 markus 236: /*
237: * Returns current time in seconds from Jan 1, 1970 with the maximum
238: * available resolution.
239: */
1.1 deraadt 240:
1.77 itojun 241: static double
1.49 itojun 242: get_current_time(void)
1.1 deraadt 243: {
1.11 markus 244: struct timeval tv;
245: gettimeofday(&tv, NULL);
246: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 247: }
248:
1.222 djm 249: /*
250: * Sets control_persist_exit_time to the absolute time when the
251: * backgrounded control master should exit due to expiry of the
252: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
253: * control master process, or if there is no ControlPersist timeout.
254: */
255: static void
256: set_control_persist_exit_time(void)
257: {
258: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 259: || options.control_persist_timeout == 0) {
1.222 djm 260: /* not using a ControlPersist timeout */
261: control_persist_exit_time = 0;
1.232 djm 262: } else if (channel_still_open()) {
1.222 djm 263: /* some client connections are still open */
264: if (control_persist_exit_time > 0)
265: debug2("%s: cancel scheduled exit", __func__);
266: control_persist_exit_time = 0;
267: } else if (control_persist_exit_time <= 0) {
268: /* a client connection has recently closed */
1.251 dtucker 269: control_persist_exit_time = monotime() +
1.222 djm 270: (time_t)options.control_persist_timeout;
271: debug2("%s: schedule exit in %d seconds", __func__,
272: options.control_persist_timeout);
273: }
274: /* else we are already counting down to the timeout */
275: }
276:
1.238 dtucker 277: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
278: static int
279: client_x11_display_valid(const char *display)
280: {
281: size_t i, dlen;
282:
1.275.2.1 sthen 283: if (display == NULL)
284: return 0;
285:
1.238 dtucker 286: dlen = strlen(display);
287: for (i = 0; i < dlen; i++) {
1.256 deraadt 288: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 289: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
290: debug("Invalid character '%c' in DISPLAY", display[i]);
291: return 0;
292: }
293: }
294: return 1;
295: }
296:
1.274 djm 297: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
298: #define X11_TIMEOUT_SLACK 60
1.275.2.1 sthen 299: int
1.138 djm 300: client_x11_get_proto(const char *display, const char *xauth_path,
1.221 djm 301: u_int trusted, u_int timeout, char **_proto, char **_data)
1.138 djm 302: {
1.275.2.1 sthen 303: char cmd[1024], line[512], xdisplay[512];
1.138 djm 304: static char proto[512], data[512];
305: FILE *f;
1.275.2.1 sthen 306: int got_data = 0, generated = 0, do_unlink = 0, i, r;
1.138 djm 307: char *xauthdir, *xauthfile;
308: struct stat st;
1.274 djm 309: u_int now, x11_timeout_real;
1.138 djm 310:
311: xauthdir = xauthfile = NULL;
312: *_proto = proto;
313: *_data = data;
314: proto[0] = data[0] = '\0';
315:
1.275.2.1 sthen 316: if (!client_x11_display_valid(display)) {
317: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
1.238 dtucker 318: display);
1.275.2.1 sthen 319: return -1;
320: }
321: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
322: debug("No xauth program.");
323: xauth_path = NULL;
324: }
325:
326: if (xauth_path != NULL) {
1.138 djm 327: /*
328: * Handle FamilyLocal case where $DISPLAY does
329: * not match an authorization entry. For this we
330: * just try "xauth list unix:displaynum.screennum".
331: * XXX: "localhost" match to determine FamilyLocal
332: * is not perfect.
333: */
334: if (strncmp(display, "localhost:", 10) == 0) {
1.275.2.1 sthen 335: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
336: display + 10)) < 0 ||
337: (size_t)r >= sizeof(xdisplay)) {
338: error("%s: display name too long", __func__);
339: return -1;
340: }
1.138 djm 341: display = xdisplay;
342: }
343: if (trusted == 0) {
1.266 deraadt 344: xauthdir = xmalloc(PATH_MAX);
345: xauthfile = xmalloc(PATH_MAX);
1.274 djm 346: /*
1.275.2.1 sthen 347: * Generate an untrusted X11 auth cookie.
348: *
1.274 djm 349: * The authentication cookie should briefly outlive
350: * ssh's willingness to forward X11 connections to
351: * avoid nasty fail-open behaviour in the X server.
352: */
1.275.2.1 sthen 353: mktemp_proto(xauthdir, PATH_MAX);
354: if (mkdtemp(xauthdir) == NULL) {
355: error("%s: mkdtemp: %s",
356: __func__, strerror(errno));
357: return -1;
358: }
359: do_unlink = 1;
1.275.2.2! sthen 360: if ((r = snprintf(xauthfile, PATH_MAX,
1.275.2.1 sthen 361: "%s/xauthfile", xauthdir)) < 0 ||
1.275.2.2! sthen 362: (size_t)r >= PATH_MAX) {
1.275.2.1 sthen 363: error("%s: xauthfile path too long", __func__);
364: unlink(xauthfile);
365: rmdir(xauthdir);
366: return -1;
367: }
368:
1.274 djm 369: if (timeout >= UINT_MAX - X11_TIMEOUT_SLACK)
370: x11_timeout_real = UINT_MAX;
371: else
372: x11_timeout_real = timeout + X11_TIMEOUT_SLACK;
1.275.2.1 sthen 373: if ((r = snprintf(cmd, sizeof(cmd),
374: "%s -f %s generate %s " SSH_X11_PROTO
375: " untrusted timeout %u 2>" _PATH_DEVNULL,
376: xauth_path, xauthfile, display,
377: x11_timeout_real)) < 0 ||
378: (size_t)r >= sizeof(cmd))
379: fatal("%s: cmd too long", __func__);
380: debug2("%s: %s", __func__, cmd);
381: if (x11_refuse_time == 0) {
382: now = monotime() + 1;
383: if (UINT_MAX - timeout < now)
384: x11_refuse_time = UINT_MAX;
385: else
386: x11_refuse_time = now + timeout;
387: channel_set_x11_refuse_time(x11_refuse_time);
1.138 djm 388: }
1.275.2.1 sthen 389: if (system(cmd) == 0)
390: generated = 1;
1.138 djm 391: }
1.181 markus 392:
393: /*
394: * When in untrusted mode, we read the cookie only if it was
395: * successfully generated as an untrusted one in the step
396: * above.
397: */
398: if (trusted || generated) {
399: snprintf(cmd, sizeof(cmd),
400: "%s %s%s list %s 2>" _PATH_DEVNULL,
401: xauth_path,
402: generated ? "-f " : "" ,
403: generated ? xauthfile : "",
404: display);
405: debug2("x11_get_proto: %s", cmd);
406: f = popen(cmd, "r");
407: if (f && fgets(line, sizeof(line), f) &&
408: sscanf(line, "%*s %511s %511s", proto, data) == 2)
409: got_data = 1;
410: if (f)
411: pclose(f);
1.275.2.1 sthen 412: }
1.138 djm 413: }
414:
415: if (do_unlink) {
416: unlink(xauthfile);
417: rmdir(xauthdir);
418: }
1.250 djm 419: free(xauthdir);
420: free(xauthfile);
1.138 djm 421:
1.275.2.1 sthen 422: /* Don't fall back to fake X11 data for untrusted forwarding */
423: if (!trusted && !got_data) {
424: error("Warning: untrusted X11 forwarding setup failed: "
425: "xauth key data not generated");
426: return -1;
427: }
428:
1.138 djm 429: /*
430: * If we didn't get authentication data, just make up some
431: * data. The forwarding code will check the validity of the
432: * response anyway, and substitute this data. The X11
433: * server, however, will ignore this fake data and use
434: * whatever authentication mechanisms it was using otherwise
435: * for the local connection.
436: */
437: if (!got_data) {
438: u_int32_t rnd = 0;
439:
440: logit("Warning: No xauth data; "
441: "using fake authentication data for X11 forwarding.");
442: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
443: for (i = 0; i < 16; i++) {
444: if (i % 4 == 0)
445: rnd = arc4random();
446: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
447: rnd & 0xff);
448: rnd >>= 8;
449: }
450: }
1.275.2.1 sthen 451:
452: return 0;
1.1 deraadt 453: }
454:
1.13 markus 455: /*
456: * This is called when the interactive is entered. This checks if there is
457: * an EOF coming on stdin. We must check this explicitly, as select() does
458: * not appear to wake up when redirecting from /dev/null.
459: */
1.1 deraadt 460:
1.77 itojun 461: static void
1.49 itojun 462: client_check_initial_eof_on_stdin(void)
1.1 deraadt 463: {
1.11 markus 464: int len;
465: char buf[1];
1.1 deraadt 466:
1.13 markus 467: /*
468: * If standard input is to be "redirected from /dev/null", we simply
469: * mark that we have seen an EOF and send an EOF message to the
470: * server. Otherwise, we try to read a single character; it appears
471: * that for some files, such /dev/null, select() never wakes up for
472: * read for this descriptor, which means that we never get EOF. This
473: * way we will get the EOF if stdin comes from /dev/null or similar.
474: */
1.11 markus 475: if (stdin_null_flag) {
476: /* Fake EOF on stdin. */
477: debug("Sending eof.");
478: stdin_eof = 1;
479: packet_start(SSH_CMSG_EOF);
480: packet_send();
481: } else {
482: enter_non_blocking();
483:
484: /* Check for immediate EOF on stdin. */
485: len = read(fileno(stdin), buf, 1);
486: if (len == 0) {
1.197 djm 487: /*
488: * EOF. Record that we have seen it and send
489: * EOF to server.
490: */
1.11 markus 491: debug("Sending eof.");
492: stdin_eof = 1;
493: packet_start(SSH_CMSG_EOF);
494: packet_send();
495: } else if (len > 0) {
1.13 markus 496: /*
497: * Got data. We must store the data in the buffer,
498: * and also process it as an escape character if
499: * appropriate.
500: */
1.195 djm 501: if ((u_char) buf[0] == escape_char1)
502: escape_pending1 = 1;
1.52 markus 503: else
1.11 markus 504: buffer_append(&stdin_buffer, buf, 1);
505: }
506: leave_non_blocking();
507: }
1.1 deraadt 508: }
509:
510:
1.13 markus 511: /*
512: * Make packets from buffered stdin data, and buffer them for sending to the
513: * connection.
514: */
1.1 deraadt 515:
1.77 itojun 516: static void
1.49 itojun 517: client_make_packets_from_stdin_data(void)
1.1 deraadt 518: {
1.42 markus 519: u_int len;
1.1 deraadt 520:
1.11 markus 521: /* Send buffered stdin data to the server. */
522: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 523: packet_not_very_much_data_to_write()) {
1.11 markus 524: len = buffer_len(&stdin_buffer);
525: /* Keep the packets at reasonable size. */
526: if (len > packet_get_maxsize())
527: len = packet_get_maxsize();
528: packet_start(SSH_CMSG_STDIN_DATA);
529: packet_put_string(buffer_ptr(&stdin_buffer), len);
530: packet_send();
531: buffer_consume(&stdin_buffer, len);
532: /* If we have a pending EOF, send it now. */
533: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
534: packet_start(SSH_CMSG_EOF);
535: packet_send();
536: }
1.1 deraadt 537: }
538: }
539:
1.13 markus 540: /*
541: * Checks if the client window has changed, and sends a packet about it to
542: * the server if so. The actual change is detected elsewhere (by a software
543: * interrupt on Unix); this just checks the flag and sends a message if
544: * appropriate.
545: */
1.1 deraadt 546:
1.77 itojun 547: static void
1.49 itojun 548: client_check_window_change(void)
1.1 deraadt 549: {
1.16 markus 550: struct winsize ws;
551:
552: if (! received_window_change_signal)
553: return;
554: /** XXX race */
555: received_window_change_signal = 0;
556:
1.37 markus 557: debug2("client_check_window_change: changed");
1.16 markus 558:
559: if (compat20) {
1.123 djm 560: channel_send_window_changes();
1.16 markus 561: } else {
1.123 djm 562: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
563: return;
1.16 markus 564: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 565: packet_put_int((u_int)ws.ws_row);
566: packet_put_int((u_int)ws.ws_col);
567: packet_put_int((u_int)ws.ws_xpixel);
568: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 569: packet_send();
1.1 deraadt 570: }
571: }
572:
1.264 markus 573: static int
1.117 markus 574: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
575: {
1.196 djm 576: struct global_confirm *gc;
577:
578: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 579: return 0;
1.196 djm 580: if (gc->cb != NULL)
581: gc->cb(type, seq, gc->ctx);
582: if (--gc->ref_count <= 0) {
583: TAILQ_REMOVE(&global_confirms, gc, entry);
1.257 tedu 584: explicit_bzero(gc, sizeof(*gc));
1.250 djm 585: free(gc);
1.196 djm 586: }
587:
1.210 andreas 588: packet_set_alive_timeouts(0);
1.264 markus 589: return 0;
1.117 markus 590: }
591:
592: static void
593: server_alive_check(void)
594: {
1.210 andreas 595: if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
1.228 djm 596: logit("Timeout, server %s not responding.", host);
1.176 markus 597: cleanup_exit(255);
598: }
1.117 markus 599: packet_start(SSH2_MSG_GLOBAL_REQUEST);
600: packet_put_cstring("keepalive@openssh.com");
601: packet_put_char(1); /* boolean: want reply */
602: packet_send();
1.196 djm 603: /* Insert an empty placeholder to maintain ordering */
604: client_register_global_confirm(NULL, NULL);
1.117 markus 605: }
606:
1.13 markus 607: /*
608: * Waits until the client can do something (some data becomes available on
609: * one of the file descriptors).
610: */
1.77 itojun 611: static void
1.46 markus 612: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 613: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 614: {
1.117 markus 615: struct timeval tv, *tvp;
1.222 djm 616: int timeout_secs;
1.251 dtucker 617: time_t minwait_secs = 0, server_alive_time = 0, now = monotime();
1.117 markus 618: int ret;
619:
1.46 markus 620: /* Add any selections by the channel mechanism. */
1.239 djm 621: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp,
622: &minwait_secs, rekeying);
1.11 markus 623:
1.16 markus 624: if (!compat20) {
1.17 markus 625: /* Read from the connection, unless our buffers are full. */
1.16 markus 626: if (buffer_len(&stdout_buffer) < buffer_high &&
627: buffer_len(&stderr_buffer) < buffer_high &&
628: channel_not_very_much_buffered_data())
1.46 markus 629: FD_SET(connection_in, *readsetp);
1.17 markus 630: /*
631: * Read from stdin, unless we have seen EOF or have very much
632: * buffered data to send to the server.
633: */
634: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 635: FD_SET(fileno(stdin), *readsetp);
1.17 markus 636:
637: /* Select stdout/stderr if have data in buffer. */
638: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 639: FD_SET(fileno(stdout), *writesetp);
1.17 markus 640: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 641: FD_SET(fileno(stderr), *writesetp);
1.16 markus 642: } else {
1.71 markus 643: /* channel_prepare_select could have closed the last channel */
1.84 markus 644: if (session_closed && !channel_still_open() &&
645: !packet_have_data_to_write()) {
646: /* clear mask since we did not call select() */
1.87 markus 647: memset(*readsetp, 0, *nallocp);
648: memset(*writesetp, 0, *nallocp);
1.84 markus 649: return;
1.71 markus 650: } else {
651: FD_SET(connection_in, *readsetp);
652: }
1.16 markus 653: }
1.11 markus 654:
655: /* Select server connection if have data to write to the server. */
656: if (packet_have_data_to_write())
1.46 markus 657: FD_SET(connection_out, *writesetp);
1.11 markus 658:
1.13 markus 659: /*
660: * Wait for something to happen. This will suspend the process until
661: * some selected descriptor can be read, written, or has some other
1.222 djm 662: * event pending, or a timeout expires.
1.13 markus 663: */
1.11 markus 664:
1.222 djm 665: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.249 dtucker 666: if (options.server_alive_interval > 0 && compat20) {
1.222 djm 667: timeout_secs = options.server_alive_interval;
1.249 dtucker 668: server_alive_time = now + options.server_alive_interval;
669: }
670: if (options.rekey_interval > 0 && compat20 && !rekeying)
671: timeout_secs = MIN(timeout_secs, packet_get_rekey_timeout());
1.222 djm 672: set_control_persist_exit_time();
673: if (control_persist_exit_time > 0) {
674: timeout_secs = MIN(timeout_secs,
1.249 dtucker 675: control_persist_exit_time - now);
1.222 djm 676: if (timeout_secs < 0)
677: timeout_secs = 0;
678: }
1.239 djm 679: if (minwait_secs != 0)
680: timeout_secs = MIN(timeout_secs, (int)minwait_secs);
1.222 djm 681: if (timeout_secs == INT_MAX)
1.117 markus 682: tvp = NULL;
1.129 deraadt 683: else {
1.222 djm 684: tv.tv_sec = timeout_secs;
1.117 markus 685: tv.tv_usec = 0;
686: tvp = &tv;
687: }
1.222 djm 688:
1.117 markus 689: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
690: if (ret < 0) {
1.11 markus 691: char buf[100];
1.51 markus 692:
693: /*
694: * We have to clear the select masks, because we return.
695: * We have to return, because the mainloop checks for the flags
696: * set by the signal handlers.
697: */
1.87 markus 698: memset(*readsetp, 0, *nallocp);
699: memset(*writesetp, 0, *nallocp);
1.50 deraadt 700:
1.11 markus 701: if (errno == EINTR)
702: return;
703: /* Note: we might still have data in the buffers. */
704: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
705: buffer_append(&stderr_buffer, buf, strlen(buf));
706: quit_pending = 1;
1.249 dtucker 707: } else if (ret == 0) {
708: /*
709: * Timeout. Could have been either keepalive or rekeying.
710: * Keepalive we check here, rekeying is checked in clientloop.
711: */
1.251 dtucker 712: if (server_alive_time != 0 && server_alive_time <= monotime())
1.249 dtucker 713: server_alive_check();
714: }
715:
1.11 markus 716: }
717:
1.77 itojun 718: static void
1.31 markus 719: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 720: {
1.11 markus 721: /* Flush stdout and stderr buffers. */
1.31 markus 722: if (buffer_len(bout) > 0)
1.197 djm 723: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
724: buffer_len(bout));
1.31 markus 725: if (buffer_len(berr) > 0)
1.197 djm 726: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
727: buffer_len(berr));
1.11 markus 728:
1.233 djm 729: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 730:
1.13 markus 731: /*
732: * Free (and clear) the buffer to reduce the amount of data that gets
733: * written to swap.
734: */
1.31 markus 735: buffer_free(bin);
736: buffer_free(bout);
737: buffer_free(berr);
1.11 markus 738:
739: /* Send the suspend signal to the program itself. */
740: kill(getpid(), SIGTSTP);
741:
1.132 djm 742: /* Reset window sizes in case they have changed */
743: received_window_change_signal = 1;
1.11 markus 744:
745: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 746: buffer_init(bin);
747: buffer_init(bout);
748: buffer_init(berr);
1.11 markus 749:
1.233 djm 750: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 751: }
752:
1.77 itojun 753: static void
1.161 deraadt 754: client_process_net_input(fd_set *readset)
1.11 markus 755: {
1.212 andreas 756: int len, cont = 0;
1.17 markus 757: char buf[8192];
1.11 markus 758:
1.13 markus 759: /*
760: * Read input from the server, and add any such data to the buffer of
761: * the packet subsystem.
762: */
1.11 markus 763: if (FD_ISSET(connection_in, readset)) {
764: /* Read as much as possible. */
1.212 andreas 765: len = roaming_read(connection_in, buf, sizeof(buf), &cont);
766: if (len == 0 && cont == 0) {
1.197 djm 767: /*
768: * Received EOF. The remote host has closed the
769: * connection.
770: */
771: snprintf(buf, sizeof buf,
772: "Connection to %.300s closed by remote host.\r\n",
773: host);
1.1 deraadt 774: buffer_append(&stderr_buffer, buf, strlen(buf));
775: quit_pending = 1;
776: return;
1.11 markus 777: }
1.13 markus 778: /*
779: * There is a kernel bug on Solaris that causes select to
780: * sometimes wake up even though there is no data available.
781: */
1.53 millert 782: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 783: len = 0;
784:
785: if (len < 0) {
1.197 djm 786: /*
787: * An error has encountered. Perhaps there is a
788: * network problem.
789: */
790: snprintf(buf, sizeof buf,
791: "Read from remote host %.300s: %.100s\r\n",
792: host, strerror(errno));
1.11 markus 793: buffer_append(&stderr_buffer, buf, strlen(buf));
794: quit_pending = 1;
795: return;
796: }
797: packet_process_incoming(buf, len);
798: }
1.17 markus 799: }
1.16 markus 800:
1.97 jakob 801: static void
1.190 djm 802: client_status_confirm(int type, Channel *c, void *ctx)
1.123 djm 803: {
1.190 djm 804: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
805: char errmsg[256];
806: int tochan;
807:
1.234 djm 808: /*
809: * If a TTY was explicitly requested, then a failure to allocate
810: * one is fatal.
811: */
812: if (cr->action == CONFIRM_TTY &&
813: (options.request_tty == REQUEST_TTY_FORCE ||
814: options.request_tty == REQUEST_TTY_YES))
815: cr->action = CONFIRM_CLOSE;
816:
1.190 djm 817: /* XXX supress on mux _client_ quietmode */
818: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 819: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 820:
821: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
822: debug2("%s request accepted on channel %d",
823: cr->request_type, c->self);
824: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
825: if (tochan) {
826: snprintf(errmsg, sizeof(errmsg),
827: "%s request failed\r\n", cr->request_type);
828: } else {
829: snprintf(errmsg, sizeof(errmsg),
830: "%s request failed on channel %d",
831: cr->request_type, c->self);
832: }
833: /* If error occurred on primary session channel, then exit */
1.234 djm 834: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 835: fatal("%s", errmsg);
1.234 djm 836: /*
837: * If error occurred on mux client, append to
838: * their stderr.
839: */
840: if (tochan) {
841: buffer_append(&c->extended, errmsg,
842: strlen(errmsg));
843: } else
1.190 djm 844: error("%s", errmsg);
1.234 djm 845: if (cr->action == CONFIRM_TTY) {
846: /*
847: * If a TTY allocation error occurred, then arrange
848: * for the correct TTY to leave raw mode.
849: */
850: if (c->self == session_ident)
851: leave_raw_mode(0);
852: else
853: mux_tty_alloc_failed(c);
854: } else if (cr->action == CONFIRM_CLOSE) {
1.190 djm 855: chan_read_failed(c);
856: chan_write_failed(c);
857: }
858: }
1.250 djm 859: free(cr);
1.190 djm 860: }
861:
862: static void
863: client_abandon_status_confirm(Channel *c, void *ctx)
864: {
1.250 djm 865: free(ctx);
1.190 djm 866: }
1.129 deraadt 867:
1.236 djm 868: void
1.234 djm 869: client_expect_confirm(int id, const char *request,
870: enum confirm_action action)
1.190 djm 871: {
1.255 djm 872: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 873:
1.190 djm 874: cr->request_type = request;
1.234 djm 875: cr->action = action;
1.123 djm 876:
1.190 djm 877: channel_register_status_confirm(id, client_status_confirm,
878: client_abandon_status_confirm, cr);
1.196 djm 879: }
880:
881: void
882: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
883: {
1.201 djm 884: struct global_confirm *gc, *last_gc;
1.196 djm 885:
886: /* Coalesce identical callbacks */
1.201 djm 887: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
888: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
889: if (++last_gc->ref_count >= INT_MAX)
890: fatal("%s: last_gc->ref_count = %d",
891: __func__, last_gc->ref_count);
1.196 djm 892: return;
893: }
894:
1.255 djm 895: gc = xcalloc(1, sizeof(*gc));
1.196 djm 896: gc->cb = cb;
897: gc->ctx = ctx;
898: gc->ref_count = 1;
899: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 900: }
901:
902: static void
1.99 markus 903: process_cmdline(void)
1.97 jakob 904: {
905: void (*handler)(int);
1.261 millert 906: char *s, *cmd;
907: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
908: struct Forward fwd;
1.97 jakob 909:
1.257 tedu 910: memset(&fwd, 0, sizeof(fwd));
1.183 djm 911:
1.233 djm 912: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 913: handler = signal(SIGINT, SIG_IGN);
1.99 markus 914: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 915: if (s == NULL)
916: goto out;
1.256 deraadt 917: while (isspace((u_char)*s))
1.97 jakob 918: s++;
1.121 djm 919: if (*s == '-')
920: s++; /* Skip cmdline '-', if any */
1.120 dtucker 921: if (*s == '\0')
1.97 jakob 922: goto out;
1.121 djm 923:
1.122 djm 924: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 925: logit("Commands:");
1.164 djm 926: logit(" -L[bind_address:]port:host:hostport "
927: "Request local forward");
928: logit(" -R[bind_address:]port:host:hostport "
929: "Request remote forward");
1.204 stevesk 930: logit(" -D[bind_address:]port "
931: "Request dynamic forward");
1.237 markus 932: logit(" -KL[bind_address:]port "
933: "Cancel local forward");
1.165 stevesk 934: logit(" -KR[bind_address:]port "
1.164 djm 935: "Cancel remote forward");
1.237 markus 936: logit(" -KD[bind_address:]port "
937: "Cancel dynamic forward");
1.146 reyk 938: if (!options.permit_local_command)
939: goto out;
1.164 djm 940: logit(" !args "
941: "Execute local command");
1.146 reyk 942: goto out;
943: }
944:
945: if (*s == '!' && options.permit_local_command) {
946: s++;
947: ssh_local_cmd(s);
1.121 djm 948: goto out;
949: }
950:
951: if (*s == 'K') {
952: delete = 1;
953: s++;
954: }
1.204 stevesk 955: if (*s == 'L')
956: local = 1;
957: else if (*s == 'R')
958: remote = 1;
959: else if (*s == 'D')
960: dynamic = 1;
961: else {
1.109 itojun 962: logit("Invalid command.");
1.97 jakob 963: goto out;
964: }
1.204 stevesk 965:
1.237 markus 966: if (delete && !compat20) {
1.109 itojun 967: logit("Not supported for SSH protocol version 1.");
1.97 jakob 968: goto out;
969: }
1.121 djm 970:
1.256 deraadt 971: while (isspace((u_char)*++s))
1.179 tedu 972: ;
1.97 jakob 973:
1.217 djm 974: /* XXX update list of forwards in options */
1.121 djm 975: if (delete) {
1.261 millert 976: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
977: if (!parse_forward(&fwd, s, 1, 0)) {
978: logit("Bad forwarding close specification.");
1.121 djm 979: goto out;
980: }
1.237 markus 981: if (remote)
1.261 millert 982: ok = channel_request_rforward_cancel(&fwd) == 0;
1.237 markus 983: else if (dynamic)
1.261 millert 984: ok = channel_cancel_lport_listener(&fwd,
985: 0, &options.fwd_opts) > 0;
1.237 markus 986: else
1.261 millert 987: ok = channel_cancel_lport_listener(&fwd,
988: CHANNEL_CANCEL_PORT_STATIC,
989: &options.fwd_opts) > 0;
1.237 markus 990: if (!ok) {
991: logit("Unkown port forwarding.");
992: goto out;
993: }
994: logit("Canceled forwarding.");
1.121 djm 995: } else {
1.209 djm 996: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 997: logit("Bad forwarding specification.");
998: goto out;
999: }
1.204 stevesk 1000: if (local || dynamic) {
1.261 millert 1001: if (!channel_setup_local_fwd_listener(&fwd,
1002: &options.fwd_opts)) {
1.121 djm 1003: logit("Port forwarding failed.");
1004: goto out;
1005: }
1.135 djm 1006: } else {
1.261 millert 1007: if (channel_request_remote_forwarding(&fwd) < 0) {
1.167 markus 1008: logit("Port forwarding failed.");
1009: goto out;
1010: }
1.135 djm 1011: }
1.121 djm 1012: logit("Forwarding port.");
1013: }
1014:
1.97 jakob 1015: out:
1016: signal(SIGINT, handler);
1.233 djm 1017: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 1018: free(cmd);
1019: free(fwd.listen_host);
1.261 millert 1020: free(fwd.listen_path);
1.250 djm 1021: free(fwd.connect_host);
1.261 millert 1022: free(fwd.connect_path);
1.97 jakob 1023: }
1024:
1.244 dtucker 1025: /* reasons to suppress output of an escape command in help output */
1026: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1027: #define SUPPRESS_PROTO1 1 /* don't show in protocol 1 sessions */
1028: #define SUPPRESS_MUXCLIENT 2 /* don't show in mux client sessions */
1029: #define SUPPRESS_MUXMASTER 4 /* don't show in mux master sessions */
1030: #define SUPPRESS_SYSLOG 8 /* don't show when logging to syslog */
1031: struct escape_help_text {
1032: const char *cmd;
1033: const char *text;
1034: unsigned int flags;
1035: };
1036: static struct escape_help_text esc_txt[] = {
1037: {".", "terminate session", SUPPRESS_MUXMASTER},
1038: {".", "terminate connection (and any multiplexed sessions)",
1039: SUPPRESS_MUXCLIENT},
1040: {"B", "send a BREAK to the remote system", SUPPRESS_PROTO1},
1041: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1042: {"R", "request rekey", SUPPRESS_PROTO1},
1.246 dtucker 1043: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 1044: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
1045: {"#", "list forwarded connections", SUPPRESS_NEVER},
1046: {"&", "background ssh (when waiting for connections to terminate)",
1047: SUPPRESS_MUXCLIENT},
1048: {"?", "this message", SUPPRESS_NEVER},
1049: };
1050:
1051: static void
1052: print_escape_help(Buffer *b, int escape_char, int protocol2, int mux_client,
1053: int using_stderr)
1054: {
1055: unsigned int i, suppress_flags;
1056: char string[1024];
1057:
1058: snprintf(string, sizeof string, "%c?\r\n"
1059: "Supported escape sequences:\r\n", escape_char);
1060: buffer_append(b, string, strlen(string));
1061:
1062: suppress_flags = (protocol2 ? 0 : SUPPRESS_PROTO1) |
1063: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
1064: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
1065: (using_stderr ? 0 : SUPPRESS_SYSLOG);
1066:
1067: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
1068: if (esc_txt[i].flags & suppress_flags)
1069: continue;
1.246 dtucker 1070: snprintf(string, sizeof string, " %c%-3s - %s\r\n",
1.244 dtucker 1071: escape_char, esc_txt[i].cmd, esc_txt[i].text);
1072: buffer_append(b, string, strlen(string));
1073: }
1074:
1075: snprintf(string, sizeof string,
1.246 dtucker 1076: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 1077: "(Note that escapes are only recognized immediately after "
1078: "newline.)\r\n", escape_char, escape_char);
1079: buffer_append(b, string, strlen(string));
1080: }
1081:
1.195 djm 1082: /*
1083: * Process the characters one by one, call with c==NULL for proto1 case.
1084: */
1.77 itojun 1085: static int
1.195 djm 1086: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
1087: char *buf, int len)
1.31 markus 1088: {
1.32 markus 1089: char string[1024];
1.31 markus 1090: pid_t pid;
1091: int bytes = 0;
1.42 markus 1092: u_int i;
1093: u_char ch;
1.31 markus 1094: char *s;
1.195 djm 1095: int *escape_pendingp, escape_char;
1096: struct escape_filter_ctx *efc;
1.31 markus 1097:
1.195 djm 1098: if (c == NULL) {
1099: escape_pendingp = &escape_pending1;
1100: escape_char = escape_char1;
1101: } else {
1102: if (c->filter_ctx == NULL)
1103: return 0;
1104: efc = (struct escape_filter_ctx *)c->filter_ctx;
1105: escape_pendingp = &efc->escape_pending;
1106: escape_char = efc->escape_char;
1107: }
1108:
1.139 djm 1109: if (len <= 0)
1110: return (0);
1111:
1112: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1113: /* Get one character at a time. */
1114: ch = buf[i];
1115:
1.195 djm 1116: if (*escape_pendingp) {
1.31 markus 1117: /* We have previously seen an escape character. */
1118: /* Clear the flag now. */
1.195 djm 1119: *escape_pendingp = 0;
1.31 markus 1120:
1121: /* Process the escaped character. */
1122: switch (ch) {
1123: case '.':
1124: /* Terminate the connection. */
1.195 djm 1125: snprintf(string, sizeof string, "%c.\r\n",
1126: escape_char);
1.32 markus 1127: buffer_append(berr, string, strlen(string));
1.31 markus 1128:
1.217 djm 1129: if (c && c->ctl_chan != -1) {
1.195 djm 1130: chan_read_failed(c);
1131: chan_write_failed(c);
1.252 dtucker 1132: if (c->detach_user)
1133: c->detach_user(c->self, NULL);
1.253 dtucker 1134: c->type = SSH_CHANNEL_ABANDONED;
1135: buffer_clear(&c->input);
1136: chan_ibuf_empty(c);
1.195 djm 1137: return 0;
1138: } else
1139: quit_pending = 1;
1.31 markus 1140: return -1;
1141:
1142: case 'Z' - 64:
1.195 djm 1143: /* XXX support this for mux clients */
1.217 djm 1144: if (c && c->ctl_chan != -1) {
1.245 dtucker 1145: char b[16];
1.195 djm 1146: noescape:
1.245 dtucker 1147: if (ch == 'Z' - 64)
1148: snprintf(b, sizeof b, "^Z");
1149: else
1150: snprintf(b, sizeof b, "%c", ch);
1.195 djm 1151: snprintf(string, sizeof string,
1.245 dtucker 1152: "%c%s escape not available to "
1.195 djm 1153: "multiplexed sessions\r\n",
1.245 dtucker 1154: escape_char, b);
1.195 djm 1155: buffer_append(berr, string,
1156: strlen(string));
1157: continue;
1158: }
1.197 djm 1159: /* Suspend the program. Inform the user */
1.195 djm 1160: snprintf(string, sizeof string,
1161: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 1162: buffer_append(berr, string, strlen(string));
1.31 markus 1163:
1164: /* Restore terminal modes and suspend. */
1165: client_suspend_self(bin, bout, berr);
1166:
1167: /* We have been continued. */
1168: continue;
1169:
1.111 markus 1170: case 'B':
1171: if (compat20) {
1172: snprintf(string, sizeof string,
1173: "%cB\r\n", escape_char);
1174: buffer_append(berr, string,
1175: strlen(string));
1.254 djm 1176: channel_request_start(c->self,
1.111 markus 1177: "break", 0);
1178: packet_put_int(1000);
1179: packet_send();
1180: }
1181: continue;
1182:
1.54 markus 1183: case 'R':
1.59 markus 1184: if (compat20) {
1185: if (datafellows & SSH_BUG_NOREKEY)
1.197 djm 1186: logit("Server does not "
1187: "support re-keying");
1.59 markus 1188: else
1189: need_rekeying = 1;
1190: }
1.54 markus 1191: continue;
1192:
1.242 dtucker 1193: case 'V':
1194: /* FALLTHROUGH */
1195: case 'v':
1196: if (c && c->ctl_chan != -1)
1197: goto noescape;
1198: if (!log_is_on_stderr()) {
1199: snprintf(string, sizeof string,
1200: "%c%c [Logging to syslog]\r\n",
1201: escape_char, ch);
1202: buffer_append(berr, string,
1203: strlen(string));
1204: continue;
1205: }
1206: if (ch == 'V' && options.log_level >
1207: SYSLOG_LEVEL_QUIET)
1208: log_change_level(--options.log_level);
1209: if (ch == 'v' && options.log_level <
1210: SYSLOG_LEVEL_DEBUG3)
1211: log_change_level(++options.log_level);
1212: snprintf(string, sizeof string,
1213: "%c%c [LogLevel %s]\r\n", escape_char, ch,
1214: log_level_name(options.log_level));
1215: buffer_append(berr, string, strlen(string));
1216: continue;
1217:
1.31 markus 1218: case '&':
1.217 djm 1219: if (c && c->ctl_chan != -1)
1.195 djm 1220: goto noescape;
1.31 markus 1221: /*
1.197 djm 1222: * Detach the program (continue to serve
1223: * connections, but put in background and no
1224: * more new connections).
1.31 markus 1225: */
1226: /* Restore tty modes. */
1.233 djm 1227: leave_raw_mode(
1228: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1229:
1230: /* Stop listening for new connections. */
1.86 markus 1231: channel_stop_listening();
1.31 markus 1232:
1.86 markus 1233: snprintf(string, sizeof string,
1234: "%c& [backgrounded]\n", escape_char);
1235: buffer_append(berr, string, strlen(string));
1.31 markus 1236:
1237: /* Fork into background. */
1238: pid = fork();
1239: if (pid < 0) {
1240: error("fork: %.100s", strerror(errno));
1241: continue;
1242: }
1243: if (pid != 0) { /* This is the parent. */
1244: /* The parent just exits. */
1245: exit(0);
1246: }
1247: /* The child continues serving connections. */
1.86 markus 1248: if (compat20) {
1249: buffer_append(bin, "\004", 1);
1250: /* fake EOF on stdin */
1251: return -1;
1252: } else if (!stdin_eof) {
1253: /*
1.197 djm 1254: * Sending SSH_CMSG_EOF alone does not
1255: * always appear to be enough. So we
1256: * try to send an EOF character first.
1.86 markus 1257: */
1258: packet_start(SSH_CMSG_STDIN_DATA);
1259: packet_put_string("\004", 1);
1260: packet_send();
1261: /* Close stdin. */
1262: stdin_eof = 1;
1263: if (buffer_len(bin) == 0) {
1264: packet_start(SSH_CMSG_EOF);
1265: packet_send();
1266: }
1267: }
1268: continue;
1.31 markus 1269:
1270: case '?':
1.244 dtucker 1271: print_escape_help(berr, escape_char, compat20,
1272: (c && c->ctl_chan != -1),
1273: log_is_on_stderr());
1.31 markus 1274: continue;
1275:
1276: case '#':
1.195 djm 1277: snprintf(string, sizeof string, "%c#\r\n",
1278: escape_char);
1.32 markus 1279: buffer_append(berr, string, strlen(string));
1.31 markus 1280: s = channel_open_message();
1281: buffer_append(berr, s, strlen(s));
1.250 djm 1282: free(s);
1.97 jakob 1283: continue;
1284:
1285: case 'C':
1.217 djm 1286: if (c && c->ctl_chan != -1)
1.206 djm 1287: goto noescape;
1.99 markus 1288: process_cmdline();
1.31 markus 1289: continue;
1290:
1291: default:
1292: if (ch != escape_char) {
1293: buffer_put_char(bin, escape_char);
1294: bytes++;
1295: }
1296: /* Escaped characters fall through here */
1297: break;
1298: }
1299: } else {
1300: /*
1.197 djm 1301: * The previous character was not an escape char.
1302: * Check if this is an escape.
1.31 markus 1303: */
1304: if (last_was_cr && ch == escape_char) {
1.197 djm 1305: /*
1306: * It is. Set the flag and continue to
1307: * next character.
1308: */
1.195 djm 1309: *escape_pendingp = 1;
1.31 markus 1310: continue;
1311: }
1312: }
1313:
1314: /*
1315: * Normal character. Record whether it was a newline,
1316: * and append it to the buffer.
1317: */
1318: last_was_cr = (ch == '\r' || ch == '\n');
1319: buffer_put_char(bin, ch);
1320: bytes++;
1321: }
1322: return bytes;
1323: }
1324:
1.77 itojun 1325: static void
1.161 deraadt 1326: client_process_input(fd_set *readset)
1.17 markus 1327: {
1.21 deraadt 1328: int len;
1.31 markus 1329: char buf[8192];
1.16 markus 1330:
1.11 markus 1331: /* Read input from stdin. */
1332: if (FD_ISSET(fileno(stdin), readset)) {
1333: /* Read as much as possible. */
1334: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1335: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1336: return; /* we'll try again later */
1.11 markus 1337: if (len <= 0) {
1.13 markus 1338: /*
1339: * Received EOF or error. They are treated
1340: * similarly, except that an error message is printed
1341: * if it was an error condition.
1342: */
1.11 markus 1343: if (len < 0) {
1.197 djm 1344: snprintf(buf, sizeof buf, "read: %.100s\r\n",
1345: strerror(errno));
1.11 markus 1346: buffer_append(&stderr_buffer, buf, strlen(buf));
1347: }
1348: /* Mark that we have seen EOF. */
1349: stdin_eof = 1;
1.13 markus 1350: /*
1351: * Send an EOF message to the server unless there is
1352: * data in the buffer. If there is data in the
1353: * buffer, no message will be sent now. Code
1354: * elsewhere will send the EOF when the buffer
1355: * becomes empty if stdin_eof is set.
1356: */
1.11 markus 1357: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1358: packet_start(SSH_CMSG_EOF);
1359: packet_send();
1.11 markus 1360: }
1.195 djm 1361: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1362: /*
1363: * Normal successful read, and no escape character.
1364: * Just append the data to buffer.
1365: */
1.11 markus 1366: buffer_append(&stdin_buffer, buf, len);
1367: } else {
1.13 markus 1368: /*
1.197 djm 1369: * Normal, successful read. But we have an escape
1370: * character and have to process the characters one
1371: * by one.
1.13 markus 1372: */
1.195 djm 1373: if (process_escapes(NULL, &stdin_buffer,
1374: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1375: return;
1.11 markus 1376: }
1377: }
1378: }
1379:
1.77 itojun 1380: static void
1.161 deraadt 1381: client_process_output(fd_set *writeset)
1.11 markus 1382: {
1383: int len;
1384: char buf[100];
1.1 deraadt 1385:
1.11 markus 1386: /* Write buffered output to stdout. */
1387: if (FD_ISSET(fileno(stdout), writeset)) {
1388: /* Write as much data as possible. */
1389: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1390: buffer_len(&stdout_buffer));
1.11 markus 1391: if (len <= 0) {
1.64 markus 1392: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1393: len = 0;
1394: else {
1.13 markus 1395: /*
1396: * An error or EOF was encountered. Put an
1397: * error message to stderr buffer.
1398: */
1.197 djm 1399: snprintf(buf, sizeof buf,
1400: "write stdout: %.50s\r\n", strerror(errno));
1.11 markus 1401: buffer_append(&stderr_buffer, buf, strlen(buf));
1402: quit_pending = 1;
1403: return;
1404: }
1405: }
1406: /* Consume printed data from the buffer. */
1407: buffer_consume(&stdout_buffer, len);
1408: }
1409: /* Write buffered output to stderr. */
1410: if (FD_ISSET(fileno(stderr), writeset)) {
1411: /* Write as much data as possible. */
1412: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1413: buffer_len(&stderr_buffer));
1.11 markus 1414: if (len <= 0) {
1.64 markus 1415: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1416: len = 0;
1417: else {
1.197 djm 1418: /*
1419: * EOF or error, but can't even print
1420: * error message.
1421: */
1.11 markus 1422: quit_pending = 1;
1423: return;
1424: }
1425: }
1426: /* Consume printed characters from the buffer. */
1427: buffer_consume(&stderr_buffer, len);
1428: }
1.1 deraadt 1429: }
1430:
1.13 markus 1431: /*
1.15 markus 1432: * Get packets from the connection input buffer, and process them as long as
1433: * there are packets available.
1434: *
1435: * Any unknown packets received during the actual
1436: * session cause the session to terminate. This is
1437: * intended to make debugging easier since no
1438: * confirmations are sent. Any compatible protocol
1439: * extensions must be negotiated during the
1440: * preparatory phase.
1441: */
1442:
1.77 itojun 1443: static void
1.49 itojun 1444: client_process_buffered_input_packets(void)
1.15 markus 1445: {
1.265 markus 1446: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, active_state);
1.15 markus 1447: }
1448:
1.31 markus 1449: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1450:
1.195 djm 1451: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1452: void *
1453: client_new_escape_filter_ctx(int escape_char)
1454: {
1455: struct escape_filter_ctx *ret;
1456:
1.255 djm 1457: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1458: ret->escape_pending = 0;
1459: ret->escape_char = escape_char;
1460: return (void *)ret;
1461: }
1462:
1.198 djm 1463: /* Free the escape filter context on channel free */
1464: void
1465: client_filter_cleanup(int cid, void *ctx)
1466: {
1.250 djm 1467: free(ctx);
1.198 djm 1468: }
1469:
1.195 djm 1470: int
1471: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1472: {
1.190 djm 1473: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1474: return 0;
1475:
1.195 djm 1476: return process_escapes(c, &c->input, &c->output, &c->extended,
1477: buf, len);
1.30 markus 1478: }
1479:
1.77 itojun 1480: static void
1.60 markus 1481: client_channel_closed(int id, void *arg)
1482: {
1.83 markus 1483: channel_cancel_cleanup(id);
1.60 markus 1484: session_closed = 1;
1.233 djm 1485: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1486: }
1487:
1.15 markus 1488: /*
1.13 markus 1489: * Implements the interactive session with the server. This is called after
1490: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1491: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1492: * used as an escape character for terminating or suspending the session.
1.13 markus 1493: */
1.1 deraadt 1494:
1.20 markus 1495: int
1.30 markus 1496: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1497: {
1.46 markus 1498: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1499: double start_time, total_time;
1.265 markus 1500: int r, max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1.200 markus 1501: u_int64_t ibytes, obytes;
1.130 avsm 1502: u_int nalloc = 0;
1.11 markus 1503: char buf[100];
1504:
1505: debug("Entering interactive session.");
1506:
1507: start_time = get_current_time();
1508:
1509: /* Initialize variables. */
1.195 djm 1510: escape_pending1 = 0;
1.11 markus 1511: last_was_cr = 1;
1512: exit_status = -1;
1513: stdin_eof = 0;
1514: buffer_high = 64 * 1024;
1515: connection_in = packet_get_connection_in();
1516: connection_out = packet_get_connection_out();
1.46 markus 1517: max_fd = MAX(connection_in, connection_out);
1518:
1519: if (!compat20) {
1.63 markus 1520: /* enable nonblocking unless tty */
1521: if (!isatty(fileno(stdin)))
1522: set_nonblock(fileno(stdin));
1523: if (!isatty(fileno(stdout)))
1524: set_nonblock(fileno(stdout));
1525: if (!isatty(fileno(stderr)))
1526: set_nonblock(fileno(stderr));
1.46 markus 1527: max_fd = MAX(max_fd, fileno(stdin));
1528: max_fd = MAX(max_fd, fileno(stdout));
1529: max_fd = MAX(max_fd, fileno(stderr));
1530: }
1.11 markus 1531: quit_pending = 0;
1.195 djm 1532: escape_char1 = escape_char_arg;
1.11 markus 1533:
1534: /* Initialize buffers. */
1535: buffer_init(&stdin_buffer);
1536: buffer_init(&stdout_buffer);
1537: buffer_init(&stderr_buffer);
1538:
1.15 markus 1539: client_init_dispatch();
1540:
1.105 markus 1541: /*
1542: * Set signal handlers, (e.g. to restore non-blocking mode)
1543: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1544: */
1.131 djm 1545: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1546: signal(SIGHUP, signal_handler);
1.105 markus 1547: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1548: signal(SIGINT, signal_handler);
1549: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1550: signal(SIGQUIT, signal_handler);
1551: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1552: signal(SIGTERM, signal_handler);
1.132 djm 1553: signal(SIGWINCH, window_change_handler);
1.11 markus 1554:
1555: if (have_pty)
1.233 djm 1556: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1557:
1.48 markus 1558: if (compat20) {
1559: session_ident = ssh2_chan_id;
1.232 djm 1560: if (session_ident != -1) {
1561: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1562: channel_register_filter(session_ident,
1563: client_simple_escape_filter, NULL,
1564: client_filter_cleanup,
1565: client_new_escape_filter_ctx(
1566: escape_char_arg));
1567: }
1.60 markus 1568: channel_register_cleanup(session_ident,
1.143 djm 1569: client_channel_closed, 0);
1.232 djm 1570: }
1.48 markus 1571: } else {
1572: /* Check if we should immediately send eof on stdin. */
1.16 markus 1573: client_check_initial_eof_on_stdin();
1.48 markus 1574: }
1.30 markus 1575:
1.11 markus 1576: /* Main loop of the client for the interactive session mode. */
1577: while (!quit_pending) {
1578:
1.13 markus 1579: /* Process buffered packets sent by the server. */
1.11 markus 1580: client_process_buffered_input_packets();
1581:
1.60 markus 1582: if (compat20 && session_closed && !channel_still_open())
1583: break;
1584:
1.263 markus 1585: rekeying = (active_state->kex != NULL && !active_state->kex->done);
1.16 markus 1586:
1.56 markus 1587: if (rekeying) {
1588: debug("rekeying in progress");
1589: } else {
1590: /*
1591: * Make packets of buffered stdin data, and buffer
1592: * them for sending to the server.
1593: */
1594: if (!compat20)
1595: client_make_packets_from_stdin_data();
1.11 markus 1596:
1.56 markus 1597: /*
1598: * Make packets from buffered channel data, and
1599: * enqueue them for sending to the server.
1600: */
1601: if (packet_not_very_much_data_to_write())
1602: channel_output_poll();
1.11 markus 1603:
1.56 markus 1604: /*
1605: * Check if the window size has changed, and buffer a
1606: * message about it to the server if so.
1607: */
1608: client_check_window_change();
1.11 markus 1609:
1.56 markus 1610: if (quit_pending)
1611: break;
1612: }
1.13 markus 1613: /*
1614: * Wait until we have something to do (something becomes
1615: * available on one of the descriptors).
1616: */
1.81 markus 1617: max_fd2 = max_fd;
1.56 markus 1618: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1619: &max_fd2, &nalloc, rekeying);
1.11 markus 1620:
1621: if (quit_pending)
1622: break;
1623:
1.56 markus 1624: /* Do channel operations unless rekeying in progress. */
1625: if (!rekeying) {
1626: channel_after_select(readset, writeset);
1.108 markus 1627: if (need_rekeying || packet_need_rekeying()) {
1628: debug("need rekeying");
1.263 markus 1629: active_state->kex->done = 0;
1.265 markus 1630: if ((r = kex_send_kexinit(active_state)) != 0)
1631: fatal("%s: kex_send_kexinit: %s",
1632: __func__, ssh_err(r));
1.56 markus 1633: need_rekeying = 0;
1634: }
1635: }
1.11 markus 1636:
1.17 markus 1637: /* Buffer input from the connection. */
1.46 markus 1638: client_process_net_input(readset);
1.17 markus 1639:
1640: if (quit_pending)
1641: break;
1.11 markus 1642:
1.17 markus 1643: if (!compat20) {
1644: /* Buffer data from stdin */
1.46 markus 1645: client_process_input(readset);
1.17 markus 1646: /*
1647: * Process output to stdout and stderr. Output to
1648: * the connection is processed elsewhere (above).
1649: */
1.46 markus 1650: client_process_output(writeset);
1.214 andreas 1651: }
1652:
1653: if (session_resumed) {
1654: connection_in = packet_get_connection_in();
1655: connection_out = packet_get_connection_out();
1656: max_fd = MAX(max_fd, connection_out);
1657: max_fd = MAX(max_fd, connection_in);
1658: session_resumed = 0;
1.17 markus 1659: }
1.11 markus 1660:
1.197 djm 1661: /*
1662: * Send as much buffered packet data as possible to the
1663: * sender.
1664: */
1.46 markus 1665: if (FD_ISSET(connection_out, writeset))
1.11 markus 1666: packet_write_poll();
1.222 djm 1667:
1668: /*
1669: * If we are a backgrounded control master, and the
1670: * timeout has expired without any active client
1671: * connections, then quit.
1672: */
1673: if (control_persist_exit_time > 0) {
1.251 dtucker 1674: if (monotime() >= control_persist_exit_time) {
1.222 djm 1675: debug("ControlPersist timeout expired");
1676: break;
1677: }
1678: }
1.11 markus 1679: }
1.250 djm 1680: free(readset);
1681: free(writeset);
1.11 markus 1682:
1683: /* Terminate the session. */
1684:
1685: /* Stop watching for window change. */
1.132 djm 1686: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1687:
1.213 stevesk 1688: if (compat20) {
1689: packet_start(SSH2_MSG_DISCONNECT);
1690: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1691: packet_put_cstring("disconnected by user");
1.219 djm 1692: packet_put_cstring(""); /* language tag */
1.213 stevesk 1693: packet_send();
1694: packet_write_wait();
1695: }
1.11 markus 1696:
1.76 markus 1697: channel_free_all();
1.11 markus 1698:
1.75 markus 1699: if (have_pty)
1.233 djm 1700: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1701:
1702: /* restore blocking io */
1703: if (!isatty(fileno(stdin)))
1704: unset_nonblock(fileno(stdin));
1705: if (!isatty(fileno(stdout)))
1706: unset_nonblock(fileno(stdout));
1707: if (!isatty(fileno(stderr)))
1708: unset_nonblock(fileno(stderr));
1.116 dtucker 1709:
1710: /*
1711: * If there was no shell or command requested, there will be no remote
1712: * exit status to be returned. In that case, clear error code if the
1713: * connection was deliberately terminated at this end.
1714: */
1715: if (no_shell_flag && received_signal == SIGTERM) {
1716: received_signal = 0;
1717: exit_status = 0;
1718: }
1.75 markus 1719:
1.113 markus 1720: if (received_signal)
1.89 itojun 1721: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1722:
1.13 markus 1723: /*
1724: * In interactive mode (with pseudo tty) display a message indicating
1725: * that the connection has been closed.
1726: */
1.11 markus 1727: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1728: snprintf(buf, sizeof buf,
1729: "Connection to %.64s closed.\r\n", host);
1.11 markus 1730: buffer_append(&stderr_buffer, buf, strlen(buf));
1731: }
1.70 markus 1732:
1.11 markus 1733: /* Output any buffered data for stdout. */
1.231 djm 1734: if (buffer_len(&stdout_buffer) > 0) {
1.230 djm 1735: len = atomicio(vwrite, fileno(stdout),
1736: buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer));
1.231 djm 1737: if (len < 0 || (u_int)len != buffer_len(&stdout_buffer))
1.11 markus 1738: error("Write failed flushing stdout buffer.");
1.231 djm 1739: else
1740: buffer_consume(&stdout_buffer, len);
1.11 markus 1741: }
1742:
1743: /* Output any buffered data for stderr. */
1.231 djm 1744: if (buffer_len(&stderr_buffer) > 0) {
1.230 djm 1745: len = atomicio(vwrite, fileno(stderr),
1746: buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1.231 djm 1747: if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1.11 markus 1748: error("Write failed flushing stderr buffer.");
1.231 djm 1749: else
1750: buffer_consume(&stderr_buffer, len);
1.11 markus 1751: }
1752:
1753: /* Clear and free any buffers. */
1754: memset(buf, 0, sizeof(buf));
1755: buffer_free(&stdin_buffer);
1756: buffer_free(&stdout_buffer);
1757: buffer_free(&stderr_buffer);
1758:
1759: /* Report bytes transferred, and transfer rates. */
1760: total_time = get_current_time() - start_time;
1.263 markus 1761: packet_get_bytes(&ibytes, &obytes);
1.200 markus 1762: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1763: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1764: if (total_time > 0)
1.200 markus 1765: verbose("Bytes per second: sent %.1f, received %.1f",
1766: obytes / total_time, ibytes / total_time);
1.11 markus 1767: /* Return the exit status of the program. */
1768: debug("Exit status %d", exit_status);
1769: return exit_status;
1.15 markus 1770: }
1771:
1772: /*********/
1773:
1.264 markus 1774: static int
1.94 markus 1775: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1776: {
1.42 markus 1777: u_int data_len;
1.15 markus 1778: char *data = packet_get_string(&data_len);
1.93 markus 1779: packet_check_eom();
1.15 markus 1780: buffer_append(&stdout_buffer, data, data_len);
1.258 djm 1781: explicit_bzero(data, data_len);
1.250 djm 1782: free(data);
1.264 markus 1783: return 0;
1.15 markus 1784: }
1.264 markus 1785: static int
1.94 markus 1786: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1787: {
1.42 markus 1788: u_int data_len;
1.15 markus 1789: char *data = packet_get_string(&data_len);
1.93 markus 1790: packet_check_eom();
1.15 markus 1791: buffer_append(&stderr_buffer, data, data_len);
1.258 djm 1792: explicit_bzero(data, data_len);
1.250 djm 1793: free(data);
1.264 markus 1794: return 0;
1.15 markus 1795: }
1.264 markus 1796: static int
1.94 markus 1797: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1798: {
1799: exit_status = packet_get_int();
1.93 markus 1800: packet_check_eom();
1.15 markus 1801: /* Acknowledge the exit. */
1802: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1803: packet_send();
1804: /*
1805: * Must wait for packet to be sent since we are
1806: * exiting the loop.
1807: */
1808: packet_write_wait();
1809: /* Flag that we want to exit. */
1810: quit_pending = 1;
1.264 markus 1811: return 0;
1.15 markus 1812: }
1.267 djm 1813:
1.264 markus 1814: static int
1.115 markus 1815: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1816: {
1817: Channel *c = NULL;
1.262 djm 1818: int r, remote_id, sock;
1.115 markus 1819:
1820: /* Read the remote channel number from the message. */
1821: remote_id = packet_get_int();
1822: packet_check_eom();
1823:
1824: /*
1825: * Get a connection to the local authentication agent (this may again
1826: * get forwarded).
1827: */
1.262 djm 1828: if ((r = ssh_get_authentication_socket(&sock)) != 0 &&
1829: r != SSH_ERR_AGENT_NOT_PRESENT)
1830: debug("%s: ssh_get_authentication_socket: %s",
1831: __func__, ssh_err(r));
1832:
1.115 markus 1833:
1834: /*
1835: * If we could not connect the agent, send an error message back to
1836: * the server. This should never happen unless the agent dies,
1837: * because authentication forwarding is only enabled if we have an
1838: * agent.
1839: */
1840: if (sock >= 0) {
1841: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1842: -1, 0, 0, 0, "authentication agent connection", 1);
1843: c->remote_id = remote_id;
1844: c->force_drain = 1;
1845: }
1846: if (c == NULL) {
1847: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1848: packet_put_int(remote_id);
1849: } else {
1850: /* Send a confirmation to the remote host. */
1851: debug("Forwarding authentication connection.");
1852: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1853: packet_put_int(remote_id);
1854: packet_put_int(c->self);
1855: }
1856: packet_send();
1.264 markus 1857: return 0;
1.115 markus 1858: }
1.15 markus 1859:
1.77 itojun 1860: static Channel *
1.40 markus 1861: client_request_forwarded_tcpip(const char *request_type, int rchan)
1862: {
1.103 deraadt 1863: Channel *c = NULL;
1.40 markus 1864: char *listen_address, *originator_address;
1.208 djm 1865: u_short listen_port, originator_port;
1.40 markus 1866:
1867: /* Get rest of the packet */
1868: listen_address = packet_get_string(NULL);
1869: listen_port = packet_get_int();
1870: originator_address = packet_get_string(NULL);
1871: originator_port = packet_get_int();
1.93 markus 1872: packet_check_eom();
1.40 markus 1873:
1.261 millert 1874: debug("%s: listen %s port %d, originator %s port %d", __func__,
1875: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1876:
1.260 markus 1877: c = channel_connect_by_listen_address(listen_address, listen_port,
1.191 djm 1878: "forwarded-tcpip", originator_address);
1.40 markus 1879:
1.250 djm 1880: free(originator_address);
1881: free(listen_address);
1.40 markus 1882: return c;
1883: }
1884:
1.103 deraadt 1885: static Channel *
1.261 millert 1886: client_request_forwarded_streamlocal(const char *request_type, int rchan)
1887: {
1888: Channel *c = NULL;
1889: char *listen_path;
1890:
1891: /* Get the remote path. */
1892: listen_path = packet_get_string(NULL);
1893: /* XXX: Skip reserved field for now. */
1894: if (packet_get_string_ptr(NULL) == NULL)
1895: fatal("%s: packet_get_string_ptr failed", __func__);
1896: packet_check_eom();
1897:
1898: debug("%s: %s", __func__, listen_path);
1899:
1900: c = channel_connect_by_listen_path(listen_path,
1901: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1902: free(listen_path);
1903: return c;
1904: }
1905:
1906: static Channel *
1.40 markus 1907: client_request_x11(const char *request_type, int rchan)
1908: {
1909: Channel *c = NULL;
1910: char *originator;
1.208 djm 1911: u_short originator_port;
1.67 markus 1912: int sock;
1.40 markus 1913:
1914: if (!options.forward_x11) {
1915: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1916: error("Warning: this is probably a break-in attempt by a "
1917: "malicious server.");
1.221 djm 1918: return NULL;
1919: }
1.274 djm 1920: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1921: verbose("Rejected X11 connection after ForwardX11Timeout "
1922: "expired");
1.40 markus 1923: return NULL;
1924: }
1925: originator = packet_get_string(NULL);
1926: if (datafellows & SSH_BUG_X11FWD) {
1927: debug2("buggy server: x11 request w/o originator_port");
1928: originator_port = 0;
1929: } else {
1930: originator_port = packet_get_int();
1931: }
1.93 markus 1932: packet_check_eom();
1.40 markus 1933: /* XXX check permission */
1.47 markus 1934: debug("client_request_x11: request from %s %d", originator,
1935: originator_port);
1.250 djm 1936: free(originator);
1.40 markus 1937: sock = x11_connect_display();
1.67 markus 1938: if (sock < 0)
1939: return NULL;
1940: c = channel_new("x11",
1941: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1942: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1943: c->force_drain = 1;
1.40 markus 1944: return c;
1945: }
1946:
1.103 deraadt 1947: static Channel *
1.40 markus 1948: client_request_agent(const char *request_type, int rchan)
1949: {
1950: Channel *c = NULL;
1.262 djm 1951: int r, sock;
1.40 markus 1952:
1953: if (!options.forward_agent) {
1954: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1955: error("Warning: this is probably a break-in attempt by a "
1956: "malicious server.");
1.40 markus 1957: return NULL;
1958: }
1.262 djm 1959: if ((r = ssh_get_authentication_socket(&sock)) != 0) {
1960: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1961: debug("%s: ssh_get_authentication_socket: %s",
1962: __func__, ssh_err(r));
1.67 markus 1963: return NULL;
1.262 djm 1964: }
1.67 markus 1965: c = channel_new("authentication agent connection",
1966: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1967: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1968: "authentication agent connection", 1);
1.82 markus 1969: c->force_drain = 1;
1.40 markus 1970: return c;
1.180 djm 1971: }
1972:
1973: int
1974: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1975: {
1976: Channel *c;
1977: int fd;
1978:
1979: if (tun_mode == SSH_TUNMODE_NO)
1980: return 0;
1981:
1982: if (!compat20) {
1.207 stevesk 1983: error("Tunnel forwarding is not supported for protocol 1");
1.180 djm 1984: return -1;
1985: }
1986:
1987: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1988:
1989: /* Open local tunnel device */
1990: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1991: error("Tunnel device open failed.");
1992: return -1;
1993: }
1994:
1995: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1996: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1997: c->datagram = 1;
1998:
1999: packet_start(SSH2_MSG_CHANNEL_OPEN);
2000: packet_put_cstring("tun@openssh.com");
2001: packet_put_int(c->self);
2002: packet_put_int(c->local_window_max);
2003: packet_put_int(c->local_maxpacket);
2004: packet_put_int(tun_mode);
2005: packet_put_int(remote_tun);
2006: packet_send();
2007:
2008: return 0;
1.40 markus 2009: }
2010:
1.22 markus 2011: /* XXXX move to generic input handler */
1.264 markus 2012: static int
1.94 markus 2013: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 2014: {
2015: Channel *c = NULL;
2016: char *ctype;
2017: int rchan;
1.102 markus 2018: u_int rmaxpack, rwindow, len;
1.22 markus 2019:
2020: ctype = packet_get_string(&len);
2021: rchan = packet_get_int();
2022: rwindow = packet_get_int();
2023: rmaxpack = packet_get_int();
2024:
1.24 markus 2025: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 2026: ctype, rchan, rwindow, rmaxpack);
2027:
1.40 markus 2028: if (strcmp(ctype, "forwarded-tcpip") == 0) {
2029: c = client_request_forwarded_tcpip(ctype, rchan);
1.261 millert 2030: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
2031: c = client_request_forwarded_streamlocal(ctype, rchan);
1.40 markus 2032: } else if (strcmp(ctype, "x11") == 0) {
2033: c = client_request_x11(ctype, rchan);
2034: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
2035: c = client_request_agent(ctype, rchan);
1.22 markus 2036: }
2037: /* XXX duplicate : */
2038: if (c != NULL) {
2039: debug("confirm %s", ctype);
2040: c->remote_id = rchan;
2041: c->remote_window = rwindow;
2042: c->remote_maxpacket = rmaxpack;
1.69 markus 2043: if (c->type != SSH_CHANNEL_CONNECTING) {
2044: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
2045: packet_put_int(c->remote_id);
2046: packet_put_int(c->self);
2047: packet_put_int(c->local_window);
2048: packet_put_int(c->local_maxpacket);
2049: packet_send();
2050: }
1.22 markus 2051: } else {
2052: debug("failure %s", ctype);
2053: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
2054: packet_put_int(rchan);
2055: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 2056: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 2057: packet_put_cstring("open failed");
1.66 markus 2058: packet_put_cstring("");
2059: }
1.22 markus 2060: packet_send();
2061: }
1.250 djm 2062: free(ctype);
1.264 markus 2063: return 0;
1.22 markus 2064: }
1.267 djm 2065:
1.264 markus 2066: static int
1.94 markus 2067: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 2068: {
2069: Channel *c = NULL;
1.123 djm 2070: int exitval, id, reply, success = 0;
1.48 markus 2071: char *rtype;
2072:
2073: id = packet_get_int();
2074: rtype = packet_get_string(NULL);
2075: reply = packet_get_char();
2076:
2077: debug("client_input_channel_req: channel %d rtype %s reply %d",
2078: id, rtype, reply);
2079:
1.128 djm 2080: if (id == -1) {
2081: error("client_input_channel_req: request for channel -1");
2082: } else if ((c = channel_lookup(id)) == NULL) {
1.197 djm 2083: error("client_input_channel_req: channel %d: "
2084: "unknown channel", id);
1.193 markus 2085: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
2086: packet_check_eom();
2087: chan_rcvd_eow(c);
1.48 markus 2088: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 2089: exitval = packet_get_int();
1.217 djm 2090: if (c->ctl_chan != -1) {
2091: mux_exit_message(c, exitval);
1.215 djm 2092: success = 1;
2093: } else if (id == session_ident) {
2094: /* Record exit value of local session */
1.123 djm 2095: success = 1;
2096: exit_status = exitval;
1.215 djm 2097: } else {
1.218 djm 2098: /* Probably for a mux channel that has already closed */
2099: debug("%s: no sink for exit-status on channel %d",
2100: __func__, id);
1.123 djm 2101: }
1.93 markus 2102: packet_check_eom();
1.48 markus 2103: }
1.259 djm 2104: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.48 markus 2105: packet_start(success ?
2106: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 2107: packet_put_int(c->remote_id);
1.48 markus 2108: packet_send();
2109: }
1.250 djm 2110: free(rtype);
1.264 markus 2111: return 0;
1.48 markus 2112: }
1.267 djm 2113:
1.269 djm 2114: struct hostkeys_update_ctx {
2115: /* The hostname and (optionally) IP address string for the server */
2116: char *host_str, *ip_str;
2117:
2118: /*
2119: * Keys received from the server and a flag for each indicating
2120: * whether they already exist in known_hosts.
2121: * keys_seen is filled in by hostkeys_find() and later (for new
2122: * keys) by client_global_hostkeys_private_confirm().
2123: */
2124: struct sshkey **keys;
2125: int *keys_seen;
2126: size_t nkeys;
2127:
2128: size_t nnew;
2129:
2130: /*
2131: * Keys that are in known_hosts, but were not present in the update
2132: * from the server (i.e. scheduled to be deleted).
2133: * Filled in by hostkeys_find().
2134: */
2135: struct sshkey **old_keys;
2136: size_t nold;
2137: };
2138:
2139: static void
2140: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
2141: {
2142: size_t i;
2143:
2144: if (ctx == NULL)
2145: return;
2146: for (i = 0; i < ctx->nkeys; i++)
2147: sshkey_free(ctx->keys[i]);
2148: free(ctx->keys);
2149: free(ctx->keys_seen);
2150: for (i = 0; i < ctx->nold; i++)
2151: sshkey_free(ctx->old_keys[i]);
2152: free(ctx->old_keys);
2153: free(ctx->host_str);
2154: free(ctx->ip_str);
2155: free(ctx);
2156: }
2157:
2158: static int
2159: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
2160: {
2161: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2162: size_t i;
2163: struct sshkey **tmp;
2164:
2165: if (l->status != HKF_STATUS_MATCHED || l->key == NULL ||
2166: l->key->type == KEY_RSA1)
2167: return 0;
2168:
2169: /* Mark off keys we've already seen for this host */
2170: for (i = 0; i < ctx->nkeys; i++) {
2171: if (sshkey_equal(l->key, ctx->keys[i])) {
2172: debug3("%s: found %s key at %s:%ld", __func__,
2173: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
2174: ctx->keys_seen[i] = 1;
2175: return 0;
2176: }
2177: }
2178: /* This line contained a key that not offered by the server */
2179: debug3("%s: deprecated %s key at %s:%ld", __func__,
2180: sshkey_ssh_name(l->key), l->path, l->linenum);
2181: if ((tmp = reallocarray(ctx->old_keys, ctx->nold + 1,
2182: sizeof(*ctx->old_keys))) == NULL)
2183: fatal("%s: reallocarray failed nold = %zu",
2184: __func__, ctx->nold);
2185: ctx->old_keys = tmp;
2186: ctx->old_keys[ctx->nold++] = l->key;
2187: l->key = NULL;
2188:
2189: return 0;
2190: }
2191:
2192: static void
2193: update_known_hosts(struct hostkeys_update_ctx *ctx)
2194: {
1.271 djm 2195: int r, was_raw = 0;
2196: int loglevel = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK ?
1.269 djm 2197: SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
2198: char *fp, *response;
2199: size_t i;
2200:
2201: for (i = 0; i < ctx->nkeys; i++) {
2202: if (ctx->keys_seen[i] != 2)
2203: continue;
2204: if ((fp = sshkey_fingerprint(ctx->keys[i],
2205: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2206: fatal("%s: sshkey_fingerprint failed", __func__);
2207: do_log2(loglevel, "Learned new hostkey: %s %s",
2208: sshkey_type(ctx->keys[i]), fp);
2209: free(fp);
2210: }
2211: for (i = 0; i < ctx->nold; i++) {
2212: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2213: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2214: fatal("%s: sshkey_fingerprint failed", __func__);
2215: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2216: sshkey_type(ctx->old_keys[i]), fp);
2217: free(fp);
2218: }
2219: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2220: if (get_saved_tio() != NULL) {
2221: leave_raw_mode(1);
2222: was_raw = 1;
2223: }
1.269 djm 2224: response = NULL;
2225: for (i = 0; !quit_pending && i < 3; i++) {
2226: free(response);
2227: response = read_passphrase("Accept updated hostkeys? "
2228: "(yes/no): ", RP_ECHO);
2229: if (strcasecmp(response, "yes") == 0)
2230: break;
2231: else if (quit_pending || response == NULL ||
2232: strcasecmp(response, "no") == 0) {
2233: options.update_hostkeys = 0;
2234: break;
2235: } else {
2236: do_log2(loglevel, "Please enter "
2237: "\"yes\" or \"no\"");
2238: }
2239: }
2240: if (quit_pending || i >= 3 || response == NULL)
2241: options.update_hostkeys = 0;
2242: free(response);
1.271 djm 2243: if (was_raw)
2244: enter_raw_mode(1);
1.269 djm 2245: }
2246:
2247: /*
2248: * Now that all the keys are verified, we can go ahead and replace
2249: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2250: * cancel the operation).
2251: */
2252: if (options.update_hostkeys != 0 &&
2253: (r = hostfile_replace_entries(options.user_hostfiles[0],
2254: ctx->host_str, ctx->ip_str, ctx->keys, ctx->nkeys,
2255: options.hash_known_hosts, 0,
2256: options.fingerprint_hash)) != 0)
2257: error("%s: hostfile_replace_entries failed: %s",
2258: __func__, ssh_err(r));
2259: }
2260:
2261: static void
2262: client_global_hostkeys_private_confirm(int type, u_int32_t seq, void *_ctx)
2263: {
2264: struct ssh *ssh = active_state; /* XXX */
2265: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2266: size_t i, ndone;
2267: struct sshbuf *signdata;
2268: int r;
2269: const u_char *sig;
2270: size_t siglen;
2271:
2272: if (ctx->nnew == 0)
2273: fatal("%s: ctx->nnew == 0", __func__); /* sanity */
2274: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2275: error("Server failed to confirm ownership of "
2276: "private host keys");
2277: hostkeys_update_ctx_free(ctx);
2278: return;
2279: }
2280: if ((signdata = sshbuf_new()) == NULL)
2281: fatal("%s: sshbuf_new failed", __func__);
2282: /* Don't want to accidentally accept an unbound signature */
2283: if (ssh->kex->session_id_len == 0)
2284: fatal("%s: ssh->kex->session_id_len == 0", __func__);
2285: /*
2286: * Expect a signature for each of the ctx->nnew private keys we
2287: * haven't seen before. They will be in the same order as the
2288: * ctx->keys where the corresponding ctx->keys_seen[i] == 0.
2289: */
2290: for (ndone = i = 0; i < ctx->nkeys; i++) {
2291: if (ctx->keys_seen[i])
2292: continue;
2293: /* Prepare data to be signed: session ID, unique string, key */
2294: sshbuf_reset(signdata);
1.270 djm 2295: if ( (r = sshbuf_put_cstring(signdata,
2296: "hostkeys-prove-00@openssh.com")) != 0 ||
2297: (r = sshbuf_put_string(signdata, ssh->kex->session_id,
1.269 djm 2298: ssh->kex->session_id_len)) != 0 ||
2299: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
2300: fatal("%s: failed to prepare signature: %s",
2301: __func__, ssh_err(r));
2302: /* Extract and verify signature */
2303: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
2304: error("%s: couldn't parse message: %s",
2305: __func__, ssh_err(r));
2306: goto out;
2307: }
2308: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
2309: sshbuf_ptr(signdata), sshbuf_len(signdata), 0)) != 0) {
2310: error("%s: server gave bad signature for %s key %zu",
2311: __func__, sshkey_type(ctx->keys[i]), i);
2312: goto out;
2313: }
2314: /* Key is good. Mark it as 'seen' */
2315: ctx->keys_seen[i] = 2;
2316: ndone++;
2317: }
2318: if (ndone != ctx->nnew)
2319: fatal("%s: ndone != ctx->nnew (%zu / %zu)", __func__,
2320: ndone, ctx->nnew); /* Shouldn't happen */
2321: ssh_packet_check_eom(ssh);
2322:
2323: /* Make the edits to known_hosts */
2324: update_known_hosts(ctx);
2325: out:
2326: hostkeys_update_ctx_free(ctx);
2327: }
2328:
1.267 djm 2329: /*
1.270 djm 2330: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2331: * the server's hostkeys. The keys are checked against the user's
2332: * HostkeyAlgorithms preference before they are accepted.
2333: */
2334: static int
2335: client_input_hostkeys(void)
2336: {
1.269 djm 2337: struct ssh *ssh = active_state; /* XXX */
1.267 djm 2338: const u_char *blob = NULL;
1.269 djm 2339: size_t i, len = 0;
1.267 djm 2340: struct sshbuf *buf = NULL;
1.269 djm 2341: struct sshkey *key = NULL, **tmp;
2342: int r;
2343: char *fp;
1.267 djm 2344: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2345: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2346: struct hostkeys_update_ctx *ctx = NULL;
1.267 djm 2347:
2348: if (hostkeys_seen)
2349: fatal("%s: server already sent hostkeys", __func__);
1.269 djm 2350: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2351: options.batch_mode)
2352: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2353: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2354: return 1;
1.272 djm 2355:
2356: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2357: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2358: sshkey_free(key);
2359: key = NULL;
1.269 djm 2360: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
2361: error("%s: couldn't parse message: %s",
2362: __func__, ssh_err(r));
2363: goto out;
2364: }
1.270 djm 2365: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
2366: error("%s: parse key: %s", __func__, ssh_err(r));
2367: goto out;
2368: }
1.267 djm 2369: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2370: SSH_FP_DEFAULT);
2371: debug3("%s: received %s key %s", __func__,
2372: sshkey_type(key), fp);
2373: free(fp);
1.275 markus 2374:
1.267 djm 2375: /* Check that the key is accepted in HostkeyAlgorithms */
1.275 markus 2376: if (match_pattern_list(sshkey_ssh_name(key),
2377: options.hostkeyalgorithms ? options.hostkeyalgorithms :
2378: KEX_DEFAULT_PK_ALG, 0) != 1) {
1.267 djm 2379: debug3("%s: %s key not permitted by HostkeyAlgorithms",
2380: __func__, sshkey_ssh_name(key));
2381: continue;
2382: }
1.269 djm 2383: /* Skip certs */
2384: if (sshkey_is_cert(key)) {
2385: debug3("%s: %s key is a certificate; skipping",
2386: __func__, sshkey_ssh_name(key));
2387: continue;
2388: }
2389: /* Ensure keys are unique */
2390: for (i = 0; i < ctx->nkeys; i++) {
2391: if (sshkey_equal(key, ctx->keys[i])) {
2392: error("%s: received duplicated %s host key",
2393: __func__, sshkey_ssh_name(key));
2394: goto out;
2395: }
2396: }
2397: /* Key is good, record it */
2398: if ((tmp = reallocarray(ctx->keys, ctx->nkeys + 1,
2399: sizeof(*ctx->keys))) == NULL)
2400: fatal("%s: reallocarray failed nkeys = %zu",
2401: __func__, ctx->nkeys);
2402: ctx->keys = tmp;
2403: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2404: key = NULL;
2405: }
2406:
1.269 djm 2407: if (ctx->nkeys == 0) {
1.270 djm 2408: debug("%s: server sent no hostkeys", __func__);
1.267 djm 2409: goto out;
2410: }
1.270 djm 2411:
1.269 djm 2412: if ((ctx->keys_seen = calloc(ctx->nkeys,
2413: sizeof(*ctx->keys_seen))) == NULL)
2414: fatal("%s: calloc failed", __func__);
1.267 djm 2415:
1.268 djm 2416: get_hostfile_hostname_ipaddr(host,
2417: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2418: options.port, &ctx->host_str,
2419: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2420:
1.269 djm 2421: /* Find which keys we already know about. */
2422: if ((r = hostkeys_foreach(options.user_hostfiles[0], hostkeys_find,
2423: ctx, ctx->host_str, ctx->ip_str,
2424: HKF_WANT_PARSE_KEY|HKF_WANT_MATCH)) != 0) {
2425: error("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1.267 djm 2426: goto out;
2427: }
2428:
1.269 djm 2429: /* Figure out if we have any new keys to add */
2430: ctx->nnew = 0;
2431: for (i = 0; i < ctx->nkeys; i++) {
2432: if (!ctx->keys_seen[i])
2433: ctx->nnew++;
2434: }
2435:
2436: debug3("%s: %zu keys from server: %zu new, %zu retained. %zu to remove",
2437: __func__, ctx->nkeys, ctx->nnew, ctx->nkeys - ctx->nnew, ctx->nold);
2438:
2439: if (ctx->nnew == 0 && ctx->nold != 0) {
2440: /* We have some keys to remove. Just do it. */
2441: update_known_hosts(ctx);
2442: } else if (ctx->nnew != 0) {
2443: /*
2444: * We have received hitherto-unseen keys from the server.
2445: * Ask the server to confirm ownership of the private halves.
2446: */
2447: debug3("%s: asking server to prove ownership for %zu keys",
2448: __func__, ctx->nnew);
2449: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2450: (r = sshpkt_put_cstring(ssh,
1.270 djm 2451: "hostkeys-prove-00@openssh.com")) != 0 ||
1.269 djm 2452: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
2453: fatal("%s: cannot prepare packet: %s",
2454: __func__, ssh_err(r));
2455: if ((buf = sshbuf_new()) == NULL)
2456: fatal("%s: sshbuf_new", __func__);
2457: for (i = 0; i < ctx->nkeys; i++) {
2458: if (ctx->keys_seen[i])
2459: continue;
2460: sshbuf_reset(buf);
2461: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0)
2462: fatal("%s: sshkey_putb: %s",
2463: __func__, ssh_err(r));
2464: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
2465: fatal("%s: sshpkt_put_string: %s",
2466: __func__, ssh_err(r));
2467: }
2468: if ((r = sshpkt_send(ssh)) != 0)
2469: fatal("%s: sshpkt_send: %s", __func__, ssh_err(r));
2470: client_register_global_confirm(
2471: client_global_hostkeys_private_confirm, ctx);
2472: ctx = NULL; /* will be freed in callback */
2473: }
2474:
1.267 djm 2475: /* Success */
2476: out:
1.269 djm 2477: hostkeys_update_ctx_free(ctx);
1.267 djm 2478: sshkey_free(key);
2479: sshbuf_free(buf);
1.269 djm 2480: /*
2481: * NB. Return success for all cases. The server doesn't need to know
2482: * what the client does with its hosts file.
2483: */
2484: return 1;
1.267 djm 2485: }
2486:
1.264 markus 2487: static int
1.95 markus 2488: client_input_global_request(int type, u_int32_t seq, void *ctxt)
2489: {
2490: char *rtype;
2491: int want_reply;
2492: int success = 0;
2493:
1.267 djm 2494: rtype = packet_get_cstring(NULL);
1.95 markus 2495: want_reply = packet_get_char();
1.117 markus 2496: debug("client_input_global_request: rtype %s want_reply %d",
2497: rtype, want_reply);
1.270 djm 2498: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.267 djm 2499: success = client_input_hostkeys();
1.95 markus 2500: if (want_reply) {
2501: packet_start(success ?
2502: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
2503: packet_send();
2504: packet_write_wait();
2505: }
1.250 djm 2506: free(rtype);
1.264 markus 2507: return 0;
1.95 markus 2508: }
1.22 markus 2509:
1.123 djm 2510: void
1.129 deraadt 2511: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 2512: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 2513: {
2514: int len;
1.132 djm 2515: Channel *c = NULL;
1.123 djm 2516:
2517: debug2("%s: id %d", __func__, id);
2518:
1.132 djm 2519: if ((c = channel_lookup(id)) == NULL)
2520: fatal("client_session2_setup: channel %d: unknown channel", id);
1.224 djm 2521:
2522: packet_set_interactive(want_tty,
2523: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2524:
1.123 djm 2525: if (want_tty) {
2526: struct winsize ws;
2527:
2528: /* Store window size in the packet. */
2529: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2530: memset(&ws, 0, sizeof(ws));
2531:
1.190 djm 2532: channel_request_start(id, "pty-req", 1);
1.234 djm 2533: client_expect_confirm(id, "PTY allocation", CONFIRM_TTY);
1.123 djm 2534: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 2535: packet_put_int((u_int)ws.ws_col);
2536: packet_put_int((u_int)ws.ws_row);
2537: packet_put_int((u_int)ws.ws_xpixel);
2538: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 2539: if (tiop == NULL)
2540: tiop = get_saved_tio();
2541: tty_make_modes(-1, tiop);
1.123 djm 2542: packet_send();
2543: /* XXX wait for reply */
1.132 djm 2544: c->client_tty = 1;
1.123 djm 2545: }
2546:
2547: /* Transfer any environment variables from client to server */
1.126 djm 2548: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2549: int i, j, matched;
2550: char *name, *val;
2551:
2552: debug("Sending environment.");
1.126 djm 2553: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2554: /* Split */
1.126 djm 2555: name = xstrdup(env[i]);
1.123 djm 2556: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2557: free(name);
1.123 djm 2558: continue;
2559: }
2560: *val++ = '\0';
2561:
2562: matched = 0;
2563: for (j = 0; j < options.num_send_env; j++) {
2564: if (match_pattern(name, options.send_env[j])) {
2565: matched = 1;
2566: break;
2567: }
2568: }
2569: if (!matched) {
2570: debug3("Ignored env %s", name);
1.250 djm 2571: free(name);
1.123 djm 2572: continue;
2573: }
2574:
2575: debug("Sending env %s = %s", name, val);
2576: channel_request_start(id, "env", 0);
2577: packet_put_cstring(name);
2578: packet_put_cstring(val);
2579: packet_send();
1.250 djm 2580: free(name);
1.123 djm 2581: }
2582: }
2583:
2584: len = buffer_len(cmd);
2585: if (len > 0) {
2586: if (len > 900)
2587: len = 900;
2588: if (want_subsystem) {
1.190 djm 2589: debug("Sending subsystem: %.*s",
2590: len, (u_char*)buffer_ptr(cmd));
2591: channel_request_start(id, "subsystem", 1);
1.234 djm 2592: client_expect_confirm(id, "subsystem", CONFIRM_CLOSE);
1.123 djm 2593: } else {
1.190 djm 2594: debug("Sending command: %.*s",
2595: len, (u_char*)buffer_ptr(cmd));
2596: channel_request_start(id, "exec", 1);
1.234 djm 2597: client_expect_confirm(id, "exec", CONFIRM_CLOSE);
1.123 djm 2598: }
2599: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2600: packet_send();
2601: } else {
1.190 djm 2602: channel_request_start(id, "shell", 1);
1.234 djm 2603: client_expect_confirm(id, "shell", CONFIRM_CLOSE);
1.123 djm 2604: packet_send();
2605: }
2606: }
2607:
1.77 itojun 2608: static void
1.49 itojun 2609: client_init_dispatch_20(void)
1.16 markus 2610: {
1.55 markus 2611: dispatch_init(&dispatch_protocol_error);
1.100 markus 2612:
1.16 markus 2613: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2614: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2615: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2616: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2617: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2618: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2619: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2620: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2621: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2622: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2623: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2624: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2625:
2626: /* rekeying */
2627: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2628:
2629: /* global request reply messages */
2630: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2631: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 2632: }
1.197 djm 2633:
1.77 itojun 2634: static void
1.49 itojun 2635: client_init_dispatch_13(void)
1.15 markus 2636: {
2637: dispatch_init(NULL);
2638: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2639: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2640: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2641: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2642: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2643: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2644: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2645: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2646: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2647:
2648: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2649: &client_input_agent_open : &deny_input_open);
1.39 markus 2650: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2651: &x11_input_open : &deny_input_open);
1.15 markus 2652: }
1.197 djm 2653:
1.77 itojun 2654: static void
1.49 itojun 2655: client_init_dispatch_15(void)
1.15 markus 2656: {
2657: client_init_dispatch_13();
2658: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2659: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2660: }
1.197 djm 2661:
1.79 stevesk 2662: static void
1.49 itojun 2663: client_init_dispatch(void)
1.15 markus 2664: {
1.16 markus 2665: if (compat20)
2666: client_init_dispatch_20();
2667: else if (compat13)
1.15 markus 2668: client_init_dispatch_13();
2669: else
2670: client_init_dispatch_15();
1.232 djm 2671: }
2672:
2673: void
2674: client_stop_mux(void)
2675: {
2676: if (options.control_path != NULL && muxserver_sock != -1)
2677: unlink(options.control_path);
2678: /*
1.247 dtucker 2679: * If we are in persist mode, or don't have a shell, signal that we
2680: * should close when all active channels are closed.
1.232 djm 2681: */
1.247 dtucker 2682: if (options.control_persist || no_shell_flag) {
1.232 djm 2683: session_closed = 1;
1.235 djm 2684: setproctitle("[stopped mux]");
2685: }
1.113 markus 2686: }
2687:
2688: /* client specific fatal cleanup */
2689: void
1.114 markus 2690: cleanup_exit(int i)
1.113 markus 2691: {
1.233 djm 2692: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2693: leave_non_blocking();
1.192 djm 2694: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2695: unlink(options.control_path);
1.223 djm 2696: ssh_kill_proxy_command();
1.114 markus 2697: _exit(i);
1.1 deraadt 2698: }
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