Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.272.2.2
1.272.2.2! sthen 1: /* $OpenBSD: clientloop.c,v 1.272.2.1 2016/01/14 11:53:20 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"
1.45 markus 95: #include "log.h"
1.261 millert 96: #include "misc.h"
1.45 markus 97: #include "readconf.h"
98: #include "clientloop.h"
1.147 djm 99: #include "sshconnect.h"
1.40 markus 100: #include "authfd.h"
1.45 markus 101: #include "atomicio.h"
1.118 deraadt 102: #include "sshpty.h"
1.123 djm 103: #include "match.h"
104: #include "msg.h"
1.212 andreas 105: #include "roaming.h"
1.262 djm 106: #include "ssherr.h"
1.267 djm 107: #include "hostfile.h"
1.39 markus 108:
109: /* import options */
110: extern Options options;
111:
1.1 deraadt 112: /* Flag indicating that stdin should be redirected from /dev/null. */
113: extern int stdin_null_flag;
114:
1.116 dtucker 115: /* Flag indicating that no shell has been requested */
116: extern int no_shell_flag;
117:
1.123 djm 118: /* Control socket */
1.217 djm 119: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 120:
1.13 markus 121: /*
122: * Name of the host we are connecting to. This is the name given on the
123: * command line, or the HostName specified for the user-supplied name in a
124: * configuration file.
125: */
1.1 deraadt 126: extern char *host;
127:
1.13 markus 128: /*
129: * Flag to indicate that we have received a window change signal which has
130: * not yet been processed. This will cause a message indicating the new
131: * window size to be sent to the server a little later. This is volatile
132: * because this is updated in a signal handler.
133: */
1.88 markus 134: static volatile sig_atomic_t received_window_change_signal = 0;
135: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 136:
1.145 djm 137: /* Flag indicating whether the user's terminal is in non-blocking mode. */
1.1 deraadt 138: static int in_non_blocking_mode = 0;
139:
1.222 djm 140: /* Time when backgrounded control master using ControlPersist should exit */
141: static time_t control_persist_exit_time = 0;
142:
1.1 deraadt 143: /* Common data for the client loop code. */
1.217 djm 144: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.195 djm 145: static int escape_char1; /* Escape character. (proto1 only) */
146: static int escape_pending1; /* Last character was an escape (proto1 only) */
1.11 markus 147: static int last_was_cr; /* Last character was a newline. */
1.197 djm 148: static int exit_status; /* Used to store the command exit status. */
149: static int stdin_eof; /* EOF has been encountered on stderr. */
1.11 markus 150: static Buffer stdin_buffer; /* Buffer for stdin data. */
151: static Buffer stdout_buffer; /* Buffer for stdout data. */
152: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.221 djm 153: static u_int buffer_high; /* Soft max buffer size. */
1.11 markus 154: static int connection_in; /* Connection to server (input). */
155: static int connection_out; /* Connection to server (output). */
1.56 markus 156: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 157: static int session_closed; /* In SSH2: login session closed. */
158: static int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.1 deraadt 159:
1.77 itojun 160: static void client_init_dispatch(void);
1.16 markus 161: int session_ident = -1;
162:
1.214 andreas 163: int session_resumed = 0;
164:
1.195 djm 165: /* Track escape per proto2 channel */
166: struct escape_filter_ctx {
167: int escape_pending;
168: int escape_char;
169: };
170:
171: /* Context for channel confirmation replies */
1.190 djm 172: struct channel_reply_ctx {
173: const char *request_type;
1.234 djm 174: int id;
175: enum confirm_action action;
1.190 djm 176: };
177:
1.196 djm 178: /* Global request success/failure callbacks */
179: struct global_confirm {
180: TAILQ_ENTRY(global_confirm) entry;
181: global_confirm_cb *cb;
182: void *ctx;
183: int ref_count;
184: };
185: TAILQ_HEAD(global_confirms, global_confirm);
186: static struct global_confirms global_confirms =
187: TAILQ_HEAD_INITIALIZER(global_confirms);
188:
1.123 djm 189: void ssh_process_session2_setup(int, int, int, Buffer *);
190:
1.1 deraadt 191: /* Restores stdin to blocking mode. */
192:
1.77 itojun 193: static void
1.49 itojun 194: leave_non_blocking(void)
1.1 deraadt 195: {
1.11 markus 196: if (in_non_blocking_mode) {
1.125 djm 197: unset_nonblock(fileno(stdin));
1.11 markus 198: in_non_blocking_mode = 0;
199: }
1.1 deraadt 200: }
201:
1.11 markus 202: /* Puts stdin terminal in non-blocking mode. */
203:
1.77 itojun 204: static void
1.49 itojun 205: enter_non_blocking(void)
1.1 deraadt 206: {
1.11 markus 207: in_non_blocking_mode = 1;
1.124 djm 208: set_nonblock(fileno(stdin));
1.1 deraadt 209: }
210:
1.13 markus 211: /*
212: * Signal handler for the window change signal (SIGWINCH). This just sets a
213: * flag indicating that the window has changed.
214: */
1.157 deraadt 215: /*ARGSUSED */
1.77 itojun 216: static void
1.11 markus 217: window_change_handler(int sig)
1.1 deraadt 218: {
1.11 markus 219: received_window_change_signal = 1;
220: signal(SIGWINCH, window_change_handler);
1.1 deraadt 221: }
222:
1.13 markus 223: /*
224: * Signal handler for signals that cause the program to terminate. These
225: * signals must be trapped to restore terminal modes.
226: */
1.157 deraadt 227: /*ARGSUSED */
1.77 itojun 228: static void
1.11 markus 229: signal_handler(int sig)
1.1 deraadt 230: {
1.75 markus 231: received_signal = sig;
232: quit_pending = 1;
1.1 deraadt 233: }
234:
1.13 markus 235: /*
236: * Returns current time in seconds from Jan 1, 1970 with the maximum
237: * available resolution.
238: */
1.1 deraadt 239:
1.77 itojun 240: static double
1.49 itojun 241: get_current_time(void)
1.1 deraadt 242: {
1.11 markus 243: struct timeval tv;
244: gettimeofday(&tv, NULL);
245: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 djm 246: }
247:
1.222 djm 248: /*
249: * Sets control_persist_exit_time to the absolute time when the
250: * backgrounded control master should exit due to expiry of the
251: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
252: * control master process, or if there is no ControlPersist timeout.
253: */
254: static void
255: set_control_persist_exit_time(void)
256: {
257: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 258: || options.control_persist_timeout == 0) {
1.222 djm 259: /* not using a ControlPersist timeout */
260: control_persist_exit_time = 0;
1.232 djm 261: } else if (channel_still_open()) {
1.222 djm 262: /* some client connections are still open */
263: if (control_persist_exit_time > 0)
264: debug2("%s: cancel scheduled exit", __func__);
265: control_persist_exit_time = 0;
266: } else if (control_persist_exit_time <= 0) {
267: /* a client connection has recently closed */
1.251 dtucker 268: control_persist_exit_time = monotime() +
1.222 djm 269: (time_t)options.control_persist_timeout;
270: debug2("%s: schedule exit in %d seconds", __func__,
271: options.control_persist_timeout);
272: }
273: /* else we are already counting down to the timeout */
274: }
275:
1.238 dtucker 276: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
277: static int
278: client_x11_display_valid(const char *display)
279: {
280: size_t i, dlen;
281:
1.272.2.1 sthen 282: if (display == NULL)
283: return 0;
284:
1.238 dtucker 285: dlen = strlen(display);
286: for (i = 0; i < dlen; i++) {
1.256 deraadt 287: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 288: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
289: debug("Invalid character '%c' in DISPLAY", display[i]);
290: return 0;
291: }
292: }
293: return 1;
294: }
295:
1.138 djm 296: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
1.272.2.1 sthen 297: int
1.138 djm 298: client_x11_get_proto(const char *display, const char *xauth_path,
1.221 djm 299: u_int trusted, u_int timeout, char **_proto, char **_data)
1.138 djm 300: {
1.272.2.1 sthen 301: char cmd[1024], line[512], xdisplay[512];
1.138 djm 302: static char proto[512], data[512];
303: FILE *f;
1.272.2.1 sthen 304: int got_data = 0, generated = 0, do_unlink = 0, i, r;
1.138 djm 305: char *xauthdir, *xauthfile;
306: struct stat st;
1.221 djm 307: u_int now;
1.138 djm 308:
309: xauthdir = xauthfile = NULL;
310: *_proto = proto;
311: *_data = data;
312: proto[0] = data[0] = '\0';
313:
1.272.2.1 sthen 314: if (!client_x11_display_valid(display)) {
315: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
1.238 dtucker 316: display);
1.272.2.1 sthen 317: return -1;
318: }
319: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
320: debug("No xauth program.");
321: xauth_path = NULL;
322: }
323:
324: if (xauth_path != NULL) {
1.138 djm 325: /*
326: * Handle FamilyLocal case where $DISPLAY does
327: * not match an authorization entry. For this we
328: * just try "xauth list unix:displaynum.screennum".
329: * XXX: "localhost" match to determine FamilyLocal
330: * is not perfect.
331: */
332: if (strncmp(display, "localhost:", 10) == 0) {
1.272.2.1 sthen 333: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
334: display + 10)) < 0 ||
335: (size_t)r >= sizeof(xdisplay)) {
336: error("%s: display name too long", __func__);
337: return -1;
338: }
1.138 djm 339: display = xdisplay;
340: }
341: if (trusted == 0) {
1.266 deraadt 342: xauthdir = xmalloc(PATH_MAX);
343: xauthfile = xmalloc(PATH_MAX);
1.272.2.1 sthen 344: /* Generate an untrusted X11 auth cookie. */
1.266 deraadt 345: mktemp_proto(xauthdir, PATH_MAX);
1.272.2.1 sthen 346: if (mkdtemp(xauthdir) == NULL) {
347: error("%s: mkdtemp: %s",
348: __func__, strerror(errno));
349: return -1;
350: }
351: do_unlink = 1;
1.272.2.2! sthen 352: if ((r = snprintf(xauthfile, PATH_MAX,
1.272.2.1 sthen 353: "%s/xauthfile", xauthdir)) < 0 ||
1.272.2.2! sthen 354: (size_t)r >= PATH_MAX) {
1.272.2.1 sthen 355: error("%s: xauthfile path too long", __func__);
356: unlink(xauthfile);
357: rmdir(xauthdir);
358: return -1;
359: }
360: if ((r = snprintf(cmd, sizeof(cmd),
361: "%s -f %s generate %s " SSH_X11_PROTO
362: " untrusted timeout %u 2>" _PATH_DEVNULL,
363: xauth_path, xauthfile, display, timeout)) < 0 ||
364: (size_t)r >= sizeof(cmd))
365: fatal("%s: cmd too long", __func__);
366: debug2("%s: %s", __func__, cmd);
367: if (system(cmd) == 0)
368: generated = 1;
369: if (x11_refuse_time == 0) {
370: now = monotime() + 1;
371: if (UINT_MAX - timeout < now)
372: x11_refuse_time = UINT_MAX;
373: else
374: x11_refuse_time = now + timeout;
1.138 djm 375: }
376: }
1.181 markus 377:
378: /*
379: * When in untrusted mode, we read the cookie only if it was
380: * successfully generated as an untrusted one in the step
381: * above.
382: */
383: if (trusted || generated) {
384: snprintf(cmd, sizeof(cmd),
385: "%s %s%s list %s 2>" _PATH_DEVNULL,
386: xauth_path,
387: generated ? "-f " : "" ,
388: generated ? xauthfile : "",
389: display);
390: debug2("x11_get_proto: %s", cmd);
391: f = popen(cmd, "r");
392: if (f && fgets(line, sizeof(line), f) &&
393: sscanf(line, "%*s %511s %511s", proto, data) == 2)
394: got_data = 1;
395: if (f)
396: pclose(f);
1.272.2.1 sthen 397: }
1.138 djm 398: }
399:
400: if (do_unlink) {
401: unlink(xauthfile);
402: rmdir(xauthdir);
403: }
1.250 djm 404: free(xauthdir);
405: free(xauthfile);
1.138 djm 406:
1.272.2.1 sthen 407: /* Don't fall back to fake X11 data for untrusted forwarding */
408: if (!trusted && !got_data) {
409: error("Warning: untrusted X11 forwarding setup failed: "
410: "xauth key data not generated");
411: return -1;
412: }
413:
1.138 djm 414: /*
415: * If we didn't get authentication data, just make up some
416: * data. The forwarding code will check the validity of the
417: * response anyway, and substitute this data. The X11
418: * server, however, will ignore this fake data and use
419: * whatever authentication mechanisms it was using otherwise
420: * for the local connection.
421: */
422: if (!got_data) {
423: u_int32_t rnd = 0;
424:
425: logit("Warning: No xauth data; "
426: "using fake authentication data for X11 forwarding.");
427: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
428: for (i = 0; i < 16; i++) {
429: if (i % 4 == 0)
430: rnd = arc4random();
431: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
432: rnd & 0xff);
433: rnd >>= 8;
434: }
435: }
1.272.2.1 sthen 436:
437: return 0;
1.1 deraadt 438: }
439:
1.13 markus 440: /*
441: * This is called when the interactive is entered. This checks if there is
442: * an EOF coming on stdin. We must check this explicitly, as select() does
443: * not appear to wake up when redirecting from /dev/null.
444: */
1.1 deraadt 445:
1.77 itojun 446: static void
1.49 itojun 447: client_check_initial_eof_on_stdin(void)
1.1 deraadt 448: {
1.11 markus 449: int len;
450: char buf[1];
1.1 deraadt 451:
1.13 markus 452: /*
453: * If standard input is to be "redirected from /dev/null", we simply
454: * mark that we have seen an EOF and send an EOF message to the
455: * server. Otherwise, we try to read a single character; it appears
456: * that for some files, such /dev/null, select() never wakes up for
457: * read for this descriptor, which means that we never get EOF. This
458: * way we will get the EOF if stdin comes from /dev/null or similar.
459: */
1.11 markus 460: if (stdin_null_flag) {
461: /* Fake EOF on stdin. */
462: debug("Sending eof.");
463: stdin_eof = 1;
464: packet_start(SSH_CMSG_EOF);
465: packet_send();
466: } else {
467: enter_non_blocking();
468:
469: /* Check for immediate EOF on stdin. */
470: len = read(fileno(stdin), buf, 1);
471: if (len == 0) {
1.197 djm 472: /*
473: * EOF. Record that we have seen it and send
474: * EOF to server.
475: */
1.11 markus 476: debug("Sending eof.");
477: stdin_eof = 1;
478: packet_start(SSH_CMSG_EOF);
479: packet_send();
480: } else if (len > 0) {
1.13 markus 481: /*
482: * Got data. We must store the data in the buffer,
483: * and also process it as an escape character if
484: * appropriate.
485: */
1.195 djm 486: if ((u_char) buf[0] == escape_char1)
487: escape_pending1 = 1;
1.52 markus 488: else
1.11 markus 489: buffer_append(&stdin_buffer, buf, 1);
490: }
491: leave_non_blocking();
492: }
1.1 deraadt 493: }
494:
495:
1.13 markus 496: /*
497: * Make packets from buffered stdin data, and buffer them for sending to the
498: * connection.
499: */
1.1 deraadt 500:
1.77 itojun 501: static void
1.49 itojun 502: client_make_packets_from_stdin_data(void)
1.1 deraadt 503: {
1.42 markus 504: u_int len;
1.1 deraadt 505:
1.11 markus 506: /* Send buffered stdin data to the server. */
507: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 508: packet_not_very_much_data_to_write()) {
1.11 markus 509: len = buffer_len(&stdin_buffer);
510: /* Keep the packets at reasonable size. */
511: if (len > packet_get_maxsize())
512: len = packet_get_maxsize();
513: packet_start(SSH_CMSG_STDIN_DATA);
514: packet_put_string(buffer_ptr(&stdin_buffer), len);
515: packet_send();
516: buffer_consume(&stdin_buffer, len);
517: /* If we have a pending EOF, send it now. */
518: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
519: packet_start(SSH_CMSG_EOF);
520: packet_send();
521: }
1.1 deraadt 522: }
523: }
524:
1.13 markus 525: /*
526: * Checks if the client window has changed, and sends a packet about it to
527: * the server if so. The actual change is detected elsewhere (by a software
528: * interrupt on Unix); this just checks the flag and sends a message if
529: * appropriate.
530: */
1.1 deraadt 531:
1.77 itojun 532: static void
1.49 itojun 533: client_check_window_change(void)
1.1 deraadt 534: {
1.16 markus 535: struct winsize ws;
536:
537: if (! received_window_change_signal)
538: return;
539: /** XXX race */
540: received_window_change_signal = 0;
541:
1.37 markus 542: debug2("client_check_window_change: changed");
1.16 markus 543:
544: if (compat20) {
1.123 djm 545: channel_send_window_changes();
1.16 markus 546: } else {
1.123 djm 547: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
548: return;
1.16 markus 549: packet_start(SSH_CMSG_WINDOW_SIZE);
1.158 deraadt 550: packet_put_int((u_int)ws.ws_row);
551: packet_put_int((u_int)ws.ws_col);
552: packet_put_int((u_int)ws.ws_xpixel);
553: packet_put_int((u_int)ws.ws_ypixel);
1.16 markus 554: packet_send();
1.1 deraadt 555: }
556: }
557:
1.264 markus 558: static int
1.117 markus 559: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
560: {
1.196 djm 561: struct global_confirm *gc;
562:
563: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 564: return 0;
1.196 djm 565: if (gc->cb != NULL)
566: gc->cb(type, seq, gc->ctx);
567: if (--gc->ref_count <= 0) {
568: TAILQ_REMOVE(&global_confirms, gc, entry);
1.257 tedu 569: explicit_bzero(gc, sizeof(*gc));
1.250 djm 570: free(gc);
1.196 djm 571: }
572:
1.210 andreas 573: packet_set_alive_timeouts(0);
1.264 markus 574: return 0;
1.117 markus 575: }
576:
577: static void
578: server_alive_check(void)
579: {
1.210 andreas 580: if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
1.228 djm 581: logit("Timeout, server %s not responding.", host);
1.176 markus 582: cleanup_exit(255);
583: }
1.117 markus 584: packet_start(SSH2_MSG_GLOBAL_REQUEST);
585: packet_put_cstring("keepalive@openssh.com");
586: packet_put_char(1); /* boolean: want reply */
587: packet_send();
1.196 djm 588: /* Insert an empty placeholder to maintain ordering */
589: client_register_global_confirm(NULL, NULL);
1.117 markus 590: }
591:
1.13 markus 592: /*
593: * Waits until the client can do something (some data becomes available on
594: * one of the file descriptors).
595: */
1.77 itojun 596: static void
1.46 markus 597: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 598: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 599: {
1.117 markus 600: struct timeval tv, *tvp;
1.222 djm 601: int timeout_secs;
1.251 dtucker 602: time_t minwait_secs = 0, server_alive_time = 0, now = monotime();
1.117 markus 603: int ret;
604:
1.46 markus 605: /* Add any selections by the channel mechanism. */
1.239 djm 606: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp,
607: &minwait_secs, rekeying);
1.11 markus 608:
1.16 markus 609: if (!compat20) {
1.17 markus 610: /* Read from the connection, unless our buffers are full. */
1.16 markus 611: if (buffer_len(&stdout_buffer) < buffer_high &&
612: buffer_len(&stderr_buffer) < buffer_high &&
613: channel_not_very_much_buffered_data())
1.46 markus 614: FD_SET(connection_in, *readsetp);
1.17 markus 615: /*
616: * Read from stdin, unless we have seen EOF or have very much
617: * buffered data to send to the server.
618: */
619: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 620: FD_SET(fileno(stdin), *readsetp);
1.17 markus 621:
622: /* Select stdout/stderr if have data in buffer. */
623: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 624: FD_SET(fileno(stdout), *writesetp);
1.17 markus 625: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 626: FD_SET(fileno(stderr), *writesetp);
1.16 markus 627: } else {
1.71 markus 628: /* channel_prepare_select could have closed the last channel */
1.84 markus 629: if (session_closed && !channel_still_open() &&
630: !packet_have_data_to_write()) {
631: /* clear mask since we did not call select() */
1.87 markus 632: memset(*readsetp, 0, *nallocp);
633: memset(*writesetp, 0, *nallocp);
1.84 markus 634: return;
1.71 markus 635: } else {
636: FD_SET(connection_in, *readsetp);
637: }
1.16 markus 638: }
1.11 markus 639:
640: /* Select server connection if have data to write to the server. */
641: if (packet_have_data_to_write())
1.46 markus 642: FD_SET(connection_out, *writesetp);
1.11 markus 643:
1.13 markus 644: /*
645: * Wait for something to happen. This will suspend the process until
646: * some selected descriptor can be read, written, or has some other
1.222 djm 647: * event pending, or a timeout expires.
1.13 markus 648: */
1.11 markus 649:
1.222 djm 650: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.249 dtucker 651: if (options.server_alive_interval > 0 && compat20) {
1.222 djm 652: timeout_secs = options.server_alive_interval;
1.249 dtucker 653: server_alive_time = now + options.server_alive_interval;
654: }
655: if (options.rekey_interval > 0 && compat20 && !rekeying)
656: timeout_secs = MIN(timeout_secs, packet_get_rekey_timeout());
1.222 djm 657: set_control_persist_exit_time();
658: if (control_persist_exit_time > 0) {
659: timeout_secs = MIN(timeout_secs,
1.249 dtucker 660: control_persist_exit_time - now);
1.222 djm 661: if (timeout_secs < 0)
662: timeout_secs = 0;
663: }
1.239 djm 664: if (minwait_secs != 0)
665: timeout_secs = MIN(timeout_secs, (int)minwait_secs);
1.222 djm 666: if (timeout_secs == INT_MAX)
1.117 markus 667: tvp = NULL;
1.129 deraadt 668: else {
1.222 djm 669: tv.tv_sec = timeout_secs;
1.117 markus 670: tv.tv_usec = 0;
671: tvp = &tv;
672: }
1.222 djm 673:
1.117 markus 674: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
675: if (ret < 0) {
1.11 markus 676: char buf[100];
1.51 markus 677:
678: /*
679: * We have to clear the select masks, because we return.
680: * We have to return, because the mainloop checks for the flags
681: * set by the signal handlers.
682: */
1.87 markus 683: memset(*readsetp, 0, *nallocp);
684: memset(*writesetp, 0, *nallocp);
1.50 deraadt 685:
1.11 markus 686: if (errno == EINTR)
687: return;
688: /* Note: we might still have data in the buffers. */
689: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
690: buffer_append(&stderr_buffer, buf, strlen(buf));
691: quit_pending = 1;
1.249 dtucker 692: } else if (ret == 0) {
693: /*
694: * Timeout. Could have been either keepalive or rekeying.
695: * Keepalive we check here, rekeying is checked in clientloop.
696: */
1.251 dtucker 697: if (server_alive_time != 0 && server_alive_time <= monotime())
1.249 dtucker 698: server_alive_check();
699: }
700:
1.11 markus 701: }
702:
1.77 itojun 703: static void
1.31 markus 704: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 705: {
1.11 markus 706: /* Flush stdout and stderr buffers. */
1.31 markus 707: if (buffer_len(bout) > 0)
1.197 djm 708: atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
709: buffer_len(bout));
1.31 markus 710: if (buffer_len(berr) > 0)
1.197 djm 711: atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
712: buffer_len(berr));
1.11 markus 713:
1.233 djm 714: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 715:
1.13 markus 716: /*
717: * Free (and clear) the buffer to reduce the amount of data that gets
718: * written to swap.
719: */
1.31 markus 720: buffer_free(bin);
721: buffer_free(bout);
722: buffer_free(berr);
1.11 markus 723:
724: /* Send the suspend signal to the program itself. */
725: kill(getpid(), SIGTSTP);
726:
1.132 djm 727: /* Reset window sizes in case they have changed */
728: received_window_change_signal = 1;
1.11 markus 729:
730: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 731: buffer_init(bin);
732: buffer_init(bout);
733: buffer_init(berr);
1.11 markus 734:
1.233 djm 735: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 736: }
737:
1.77 itojun 738: static void
1.161 deraadt 739: client_process_net_input(fd_set *readset)
1.11 markus 740: {
1.212 andreas 741: int len, cont = 0;
1.17 markus 742: char buf[8192];
1.11 markus 743:
1.13 markus 744: /*
745: * Read input from the server, and add any such data to the buffer of
746: * the packet subsystem.
747: */
1.11 markus 748: if (FD_ISSET(connection_in, readset)) {
749: /* Read as much as possible. */
1.212 andreas 750: len = roaming_read(connection_in, buf, sizeof(buf), &cont);
751: if (len == 0 && cont == 0) {
1.197 djm 752: /*
753: * Received EOF. The remote host has closed the
754: * connection.
755: */
756: snprintf(buf, sizeof buf,
757: "Connection to %.300s closed by remote host.\r\n",
758: host);
1.1 deraadt 759: buffer_append(&stderr_buffer, buf, strlen(buf));
760: quit_pending = 1;
761: return;
1.11 markus 762: }
1.13 markus 763: /*
764: * There is a kernel bug on Solaris that causes select to
765: * sometimes wake up even though there is no data available.
766: */
1.53 millert 767: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 768: len = 0;
769:
770: if (len < 0) {
1.197 djm 771: /*
772: * An error has encountered. Perhaps there is a
773: * network problem.
774: */
775: snprintf(buf, sizeof buf,
776: "Read from remote host %.300s: %.100s\r\n",
777: host, strerror(errno));
1.11 markus 778: buffer_append(&stderr_buffer, buf, strlen(buf));
779: quit_pending = 1;
780: return;
781: }
782: packet_process_incoming(buf, len);
783: }
1.17 markus 784: }
1.16 markus 785:
1.97 jakob 786: static void
1.190 djm 787: client_status_confirm(int type, Channel *c, void *ctx)
1.123 djm 788: {
1.190 djm 789: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
790: char errmsg[256];
791: int tochan;
792:
1.234 djm 793: /*
794: * If a TTY was explicitly requested, then a failure to allocate
795: * one is fatal.
796: */
797: if (cr->action == CONFIRM_TTY &&
798: (options.request_tty == REQUEST_TTY_FORCE ||
799: options.request_tty == REQUEST_TTY_YES))
800: cr->action = CONFIRM_CLOSE;
801:
1.190 djm 802: /* XXX supress on mux _client_ quietmode */
803: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 804: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 805:
806: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
807: debug2("%s request accepted on channel %d",
808: cr->request_type, c->self);
809: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
810: if (tochan) {
811: snprintf(errmsg, sizeof(errmsg),
812: "%s request failed\r\n", cr->request_type);
813: } else {
814: snprintf(errmsg, sizeof(errmsg),
815: "%s request failed on channel %d",
816: cr->request_type, c->self);
817: }
818: /* If error occurred on primary session channel, then exit */
1.234 djm 819: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 820: fatal("%s", errmsg);
1.234 djm 821: /*
822: * If error occurred on mux client, append to
823: * their stderr.
824: */
825: if (tochan) {
826: buffer_append(&c->extended, errmsg,
827: strlen(errmsg));
828: } else
1.190 djm 829: error("%s", errmsg);
1.234 djm 830: if (cr->action == CONFIRM_TTY) {
831: /*
832: * If a TTY allocation error occurred, then arrange
833: * for the correct TTY to leave raw mode.
834: */
835: if (c->self == session_ident)
836: leave_raw_mode(0);
837: else
838: mux_tty_alloc_failed(c);
839: } else if (cr->action == CONFIRM_CLOSE) {
1.190 djm 840: chan_read_failed(c);
841: chan_write_failed(c);
842: }
843: }
1.250 djm 844: free(cr);
1.190 djm 845: }
846:
847: static void
848: client_abandon_status_confirm(Channel *c, void *ctx)
849: {
1.250 djm 850: free(ctx);
1.190 djm 851: }
1.129 deraadt 852:
1.236 djm 853: void
1.234 djm 854: client_expect_confirm(int id, const char *request,
855: enum confirm_action action)
1.190 djm 856: {
1.255 djm 857: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 858:
1.190 djm 859: cr->request_type = request;
1.234 djm 860: cr->action = action;
1.123 djm 861:
1.190 djm 862: channel_register_status_confirm(id, client_status_confirm,
863: client_abandon_status_confirm, cr);
1.196 djm 864: }
865:
866: void
867: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
868: {
1.201 djm 869: struct global_confirm *gc, *last_gc;
1.196 djm 870:
871: /* Coalesce identical callbacks */
1.201 djm 872: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
873: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
874: if (++last_gc->ref_count >= INT_MAX)
875: fatal("%s: last_gc->ref_count = %d",
876: __func__, last_gc->ref_count);
1.196 djm 877: return;
878: }
879:
1.255 djm 880: gc = xcalloc(1, sizeof(*gc));
1.196 djm 881: gc->cb = cb;
882: gc->ctx = ctx;
883: gc->ref_count = 1;
884: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 885: }
886:
887: static void
1.99 markus 888: process_cmdline(void)
1.97 jakob 889: {
890: void (*handler)(int);
1.261 millert 891: char *s, *cmd;
892: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
893: struct Forward fwd;
1.97 jakob 894:
1.257 tedu 895: memset(&fwd, 0, sizeof(fwd));
1.183 djm 896:
1.233 djm 897: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.101 markus 898: handler = signal(SIGINT, SIG_IGN);
1.99 markus 899: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 900: if (s == NULL)
901: goto out;
1.256 deraadt 902: while (isspace((u_char)*s))
1.97 jakob 903: s++;
1.121 djm 904: if (*s == '-')
905: s++; /* Skip cmdline '-', if any */
1.120 dtucker 906: if (*s == '\0')
1.97 jakob 907: goto out;
1.121 djm 908:
1.122 djm 909: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 910: logit("Commands:");
1.164 djm 911: logit(" -L[bind_address:]port:host:hostport "
912: "Request local forward");
913: logit(" -R[bind_address:]port:host:hostport "
914: "Request remote forward");
1.204 stevesk 915: logit(" -D[bind_address:]port "
916: "Request dynamic forward");
1.237 markus 917: logit(" -KL[bind_address:]port "
918: "Cancel local forward");
1.165 stevesk 919: logit(" -KR[bind_address:]port "
1.164 djm 920: "Cancel remote forward");
1.237 markus 921: logit(" -KD[bind_address:]port "
922: "Cancel dynamic forward");
1.146 reyk 923: if (!options.permit_local_command)
924: goto out;
1.164 djm 925: logit(" !args "
926: "Execute local command");
1.146 reyk 927: goto out;
928: }
929:
930: if (*s == '!' && options.permit_local_command) {
931: s++;
932: ssh_local_cmd(s);
1.121 djm 933: goto out;
934: }
935:
936: if (*s == 'K') {
937: delete = 1;
938: s++;
939: }
1.204 stevesk 940: if (*s == 'L')
941: local = 1;
942: else if (*s == 'R')
943: remote = 1;
944: else if (*s == 'D')
945: dynamic = 1;
946: else {
1.109 itojun 947: logit("Invalid command.");
1.97 jakob 948: goto out;
949: }
1.204 stevesk 950:
1.237 markus 951: if (delete && !compat20) {
1.109 itojun 952: logit("Not supported for SSH protocol version 1.");
1.97 jakob 953: goto out;
954: }
1.121 djm 955:
1.256 deraadt 956: while (isspace((u_char)*++s))
1.179 tedu 957: ;
1.97 jakob 958:
1.217 djm 959: /* XXX update list of forwards in options */
1.121 djm 960: if (delete) {
1.261 millert 961: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
962: if (!parse_forward(&fwd, s, 1, 0)) {
963: logit("Bad forwarding close specification.");
1.121 djm 964: goto out;
965: }
1.237 markus 966: if (remote)
1.261 millert 967: ok = channel_request_rforward_cancel(&fwd) == 0;
1.237 markus 968: else if (dynamic)
1.261 millert 969: ok = channel_cancel_lport_listener(&fwd,
970: 0, &options.fwd_opts) > 0;
1.237 markus 971: else
1.261 millert 972: ok = channel_cancel_lport_listener(&fwd,
973: CHANNEL_CANCEL_PORT_STATIC,
974: &options.fwd_opts) > 0;
1.237 markus 975: if (!ok) {
976: logit("Unkown port forwarding.");
977: goto out;
978: }
979: logit("Canceled forwarding.");
1.121 djm 980: } else {
1.209 djm 981: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 982: logit("Bad forwarding specification.");
983: goto out;
984: }
1.204 stevesk 985: if (local || dynamic) {
1.261 millert 986: if (!channel_setup_local_fwd_listener(&fwd,
987: &options.fwd_opts)) {
1.121 djm 988: logit("Port forwarding failed.");
989: goto out;
990: }
1.135 djm 991: } else {
1.261 millert 992: if (channel_request_remote_forwarding(&fwd) < 0) {
1.167 markus 993: logit("Port forwarding failed.");
994: goto out;
995: }
1.135 djm 996: }
1.121 djm 997: logit("Forwarding port.");
998: }
999:
1.97 jakob 1000: out:
1001: signal(SIGINT, handler);
1.233 djm 1002: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 1003: free(cmd);
1004: free(fwd.listen_host);
1.261 millert 1005: free(fwd.listen_path);
1.250 djm 1006: free(fwd.connect_host);
1.261 millert 1007: free(fwd.connect_path);
1.97 jakob 1008: }
1009:
1.244 dtucker 1010: /* reasons to suppress output of an escape command in help output */
1011: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1012: #define SUPPRESS_PROTO1 1 /* don't show in protocol 1 sessions */
1013: #define SUPPRESS_MUXCLIENT 2 /* don't show in mux client sessions */
1014: #define SUPPRESS_MUXMASTER 4 /* don't show in mux master sessions */
1015: #define SUPPRESS_SYSLOG 8 /* don't show when logging to syslog */
1016: struct escape_help_text {
1017: const char *cmd;
1018: const char *text;
1019: unsigned int flags;
1020: };
1021: static struct escape_help_text esc_txt[] = {
1022: {".", "terminate session", SUPPRESS_MUXMASTER},
1023: {".", "terminate connection (and any multiplexed sessions)",
1024: SUPPRESS_MUXCLIENT},
1025: {"B", "send a BREAK to the remote system", SUPPRESS_PROTO1},
1026: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1027: {"R", "request rekey", SUPPRESS_PROTO1},
1.246 dtucker 1028: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 1029: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
1030: {"#", "list forwarded connections", SUPPRESS_NEVER},
1031: {"&", "background ssh (when waiting for connections to terminate)",
1032: SUPPRESS_MUXCLIENT},
1033: {"?", "this message", SUPPRESS_NEVER},
1034: };
1035:
1036: static void
1037: print_escape_help(Buffer *b, int escape_char, int protocol2, int mux_client,
1038: int using_stderr)
1039: {
1040: unsigned int i, suppress_flags;
1041: char string[1024];
1042:
1043: snprintf(string, sizeof string, "%c?\r\n"
1044: "Supported escape sequences:\r\n", escape_char);
1045: buffer_append(b, string, strlen(string));
1046:
1047: suppress_flags = (protocol2 ? 0 : SUPPRESS_PROTO1) |
1048: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
1049: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
1050: (using_stderr ? 0 : SUPPRESS_SYSLOG);
1051:
1052: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
1053: if (esc_txt[i].flags & suppress_flags)
1054: continue;
1.246 dtucker 1055: snprintf(string, sizeof string, " %c%-3s - %s\r\n",
1.244 dtucker 1056: escape_char, esc_txt[i].cmd, esc_txt[i].text);
1057: buffer_append(b, string, strlen(string));
1058: }
1059:
1060: snprintf(string, sizeof string,
1.246 dtucker 1061: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 1062: "(Note that escapes are only recognized immediately after "
1063: "newline.)\r\n", escape_char, escape_char);
1064: buffer_append(b, string, strlen(string));
1065: }
1066:
1.195 djm 1067: /*
1068: * Process the characters one by one, call with c==NULL for proto1 case.
1069: */
1.77 itojun 1070: static int
1.195 djm 1071: process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
1072: char *buf, int len)
1.31 markus 1073: {
1.32 markus 1074: char string[1024];
1.31 markus 1075: pid_t pid;
1076: int bytes = 0;
1.42 markus 1077: u_int i;
1078: u_char ch;
1.31 markus 1079: char *s;
1.195 djm 1080: int *escape_pendingp, escape_char;
1081: struct escape_filter_ctx *efc;
1.31 markus 1082:
1.195 djm 1083: if (c == NULL) {
1084: escape_pendingp = &escape_pending1;
1085: escape_char = escape_char1;
1086: } else {
1087: if (c->filter_ctx == NULL)
1088: return 0;
1089: efc = (struct escape_filter_ctx *)c->filter_ctx;
1090: escape_pendingp = &efc->escape_pending;
1091: escape_char = efc->escape_char;
1092: }
1093:
1.139 djm 1094: if (len <= 0)
1095: return (0);
1096:
1097: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1098: /* Get one character at a time. */
1099: ch = buf[i];
1100:
1.195 djm 1101: if (*escape_pendingp) {
1.31 markus 1102: /* We have previously seen an escape character. */
1103: /* Clear the flag now. */
1.195 djm 1104: *escape_pendingp = 0;
1.31 markus 1105:
1106: /* Process the escaped character. */
1107: switch (ch) {
1108: case '.':
1109: /* Terminate the connection. */
1.195 djm 1110: snprintf(string, sizeof string, "%c.\r\n",
1111: escape_char);
1.32 markus 1112: buffer_append(berr, string, strlen(string));
1.31 markus 1113:
1.217 djm 1114: if (c && c->ctl_chan != -1) {
1.195 djm 1115: chan_read_failed(c);
1116: chan_write_failed(c);
1.252 dtucker 1117: if (c->detach_user)
1118: c->detach_user(c->self, NULL);
1.253 dtucker 1119: c->type = SSH_CHANNEL_ABANDONED;
1120: buffer_clear(&c->input);
1121: chan_ibuf_empty(c);
1.195 djm 1122: return 0;
1123: } else
1124: quit_pending = 1;
1.31 markus 1125: return -1;
1126:
1127: case 'Z' - 64:
1.195 djm 1128: /* XXX support this for mux clients */
1.217 djm 1129: if (c && c->ctl_chan != -1) {
1.245 dtucker 1130: char b[16];
1.195 djm 1131: noescape:
1.245 dtucker 1132: if (ch == 'Z' - 64)
1133: snprintf(b, sizeof b, "^Z");
1134: else
1135: snprintf(b, sizeof b, "%c", ch);
1.195 djm 1136: snprintf(string, sizeof string,
1.245 dtucker 1137: "%c%s escape not available to "
1.195 djm 1138: "multiplexed sessions\r\n",
1.245 dtucker 1139: escape_char, b);
1.195 djm 1140: buffer_append(berr, string,
1141: strlen(string));
1142: continue;
1143: }
1.197 djm 1144: /* Suspend the program. Inform the user */
1.195 djm 1145: snprintf(string, sizeof string,
1146: "%c^Z [suspend ssh]\r\n", escape_char);
1.32 markus 1147: buffer_append(berr, string, strlen(string));
1.31 markus 1148:
1149: /* Restore terminal modes and suspend. */
1150: client_suspend_self(bin, bout, berr);
1151:
1152: /* We have been continued. */
1153: continue;
1154:
1.111 markus 1155: case 'B':
1156: if (compat20) {
1157: snprintf(string, sizeof string,
1158: "%cB\r\n", escape_char);
1159: buffer_append(berr, string,
1160: strlen(string));
1.254 djm 1161: channel_request_start(c->self,
1.111 markus 1162: "break", 0);
1163: packet_put_int(1000);
1164: packet_send();
1165: }
1166: continue;
1167:
1.54 markus 1168: case 'R':
1.59 markus 1169: if (compat20) {
1170: if (datafellows & SSH_BUG_NOREKEY)
1.197 djm 1171: logit("Server does not "
1172: "support re-keying");
1.59 markus 1173: else
1174: need_rekeying = 1;
1175: }
1.54 markus 1176: continue;
1177:
1.242 dtucker 1178: case 'V':
1179: /* FALLTHROUGH */
1180: case 'v':
1181: if (c && c->ctl_chan != -1)
1182: goto noescape;
1183: if (!log_is_on_stderr()) {
1184: snprintf(string, sizeof string,
1185: "%c%c [Logging to syslog]\r\n",
1186: escape_char, ch);
1187: buffer_append(berr, string,
1188: strlen(string));
1189: continue;
1190: }
1191: if (ch == 'V' && options.log_level >
1192: SYSLOG_LEVEL_QUIET)
1193: log_change_level(--options.log_level);
1194: if (ch == 'v' && options.log_level <
1195: SYSLOG_LEVEL_DEBUG3)
1196: log_change_level(++options.log_level);
1197: snprintf(string, sizeof string,
1198: "%c%c [LogLevel %s]\r\n", escape_char, ch,
1199: log_level_name(options.log_level));
1200: buffer_append(berr, string, strlen(string));
1201: continue;
1202:
1.31 markus 1203: case '&':
1.217 djm 1204: if (c && c->ctl_chan != -1)
1.195 djm 1205: goto noescape;
1.31 markus 1206: /*
1.197 djm 1207: * Detach the program (continue to serve
1208: * connections, but put in background and no
1209: * more new connections).
1.31 markus 1210: */
1211: /* Restore tty modes. */
1.233 djm 1212: leave_raw_mode(
1213: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1214:
1215: /* Stop listening for new connections. */
1.86 markus 1216: channel_stop_listening();
1.31 markus 1217:
1.86 markus 1218: snprintf(string, sizeof string,
1219: "%c& [backgrounded]\n", escape_char);
1220: buffer_append(berr, string, strlen(string));
1.31 markus 1221:
1222: /* Fork into background. */
1223: pid = fork();
1224: if (pid < 0) {
1225: error("fork: %.100s", strerror(errno));
1226: continue;
1227: }
1228: if (pid != 0) { /* This is the parent. */
1229: /* The parent just exits. */
1230: exit(0);
1231: }
1232: /* The child continues serving connections. */
1.86 markus 1233: if (compat20) {
1234: buffer_append(bin, "\004", 1);
1235: /* fake EOF on stdin */
1236: return -1;
1237: } else if (!stdin_eof) {
1238: /*
1.197 djm 1239: * Sending SSH_CMSG_EOF alone does not
1240: * always appear to be enough. So we
1241: * try to send an EOF character first.
1.86 markus 1242: */
1243: packet_start(SSH_CMSG_STDIN_DATA);
1244: packet_put_string("\004", 1);
1245: packet_send();
1246: /* Close stdin. */
1247: stdin_eof = 1;
1248: if (buffer_len(bin) == 0) {
1249: packet_start(SSH_CMSG_EOF);
1250: packet_send();
1251: }
1252: }
1253: continue;
1.31 markus 1254:
1255: case '?':
1.244 dtucker 1256: print_escape_help(berr, escape_char, compat20,
1257: (c && c->ctl_chan != -1),
1258: log_is_on_stderr());
1.31 markus 1259: continue;
1260:
1261: case '#':
1.195 djm 1262: snprintf(string, sizeof string, "%c#\r\n",
1263: escape_char);
1.32 markus 1264: buffer_append(berr, string, strlen(string));
1.31 markus 1265: s = channel_open_message();
1266: buffer_append(berr, s, strlen(s));
1.250 djm 1267: free(s);
1.97 jakob 1268: continue;
1269:
1270: case 'C':
1.217 djm 1271: if (c && c->ctl_chan != -1)
1.206 djm 1272: goto noescape;
1.99 markus 1273: process_cmdline();
1.31 markus 1274: continue;
1275:
1276: default:
1277: if (ch != escape_char) {
1278: buffer_put_char(bin, escape_char);
1279: bytes++;
1280: }
1281: /* Escaped characters fall through here */
1282: break;
1283: }
1284: } else {
1285: /*
1.197 djm 1286: * The previous character was not an escape char.
1287: * Check if this is an escape.
1.31 markus 1288: */
1289: if (last_was_cr && ch == escape_char) {
1.197 djm 1290: /*
1291: * It is. Set the flag and continue to
1292: * next character.
1293: */
1.195 djm 1294: *escape_pendingp = 1;
1.31 markus 1295: continue;
1296: }
1297: }
1298:
1299: /*
1300: * Normal character. Record whether it was a newline,
1301: * and append it to the buffer.
1302: */
1303: last_was_cr = (ch == '\r' || ch == '\n');
1304: buffer_put_char(bin, ch);
1305: bytes++;
1306: }
1307: return bytes;
1308: }
1309:
1.77 itojun 1310: static void
1.161 deraadt 1311: client_process_input(fd_set *readset)
1.17 markus 1312: {
1.21 deraadt 1313: int len;
1.31 markus 1314: char buf[8192];
1.16 markus 1315:
1.11 markus 1316: /* Read input from stdin. */
1317: if (FD_ISSET(fileno(stdin), readset)) {
1318: /* Read as much as possible. */
1319: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1320: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1321: return; /* we'll try again later */
1.11 markus 1322: if (len <= 0) {
1.13 markus 1323: /*
1324: * Received EOF or error. They are treated
1325: * similarly, except that an error message is printed
1326: * if it was an error condition.
1327: */
1.11 markus 1328: if (len < 0) {
1.197 djm 1329: snprintf(buf, sizeof buf, "read: %.100s\r\n",
1330: strerror(errno));
1.11 markus 1331: buffer_append(&stderr_buffer, buf, strlen(buf));
1332: }
1333: /* Mark that we have seen EOF. */
1334: stdin_eof = 1;
1.13 markus 1335: /*
1336: * Send an EOF message to the server unless there is
1337: * data in the buffer. If there is data in the
1338: * buffer, no message will be sent now. Code
1339: * elsewhere will send the EOF when the buffer
1340: * becomes empty if stdin_eof is set.
1341: */
1.11 markus 1342: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1343: packet_start(SSH_CMSG_EOF);
1344: packet_send();
1.11 markus 1345: }
1.195 djm 1346: } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
1.13 markus 1347: /*
1348: * Normal successful read, and no escape character.
1349: * Just append the data to buffer.
1350: */
1.11 markus 1351: buffer_append(&stdin_buffer, buf, len);
1352: } else {
1.13 markus 1353: /*
1.197 djm 1354: * Normal, successful read. But we have an escape
1355: * character and have to process the characters one
1356: * by one.
1.13 markus 1357: */
1.195 djm 1358: if (process_escapes(NULL, &stdin_buffer,
1359: &stdout_buffer, &stderr_buffer, buf, len) == -1)
1.31 markus 1360: return;
1.11 markus 1361: }
1362: }
1363: }
1364:
1.77 itojun 1365: static void
1.161 deraadt 1366: client_process_output(fd_set *writeset)
1.11 markus 1367: {
1368: int len;
1369: char buf[100];
1.1 deraadt 1370:
1.11 markus 1371: /* Write buffered output to stdout. */
1372: if (FD_ISSET(fileno(stdout), writeset)) {
1373: /* Write as much data as possible. */
1374: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1375: buffer_len(&stdout_buffer));
1.11 markus 1376: if (len <= 0) {
1.64 markus 1377: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1378: len = 0;
1379: else {
1.13 markus 1380: /*
1381: * An error or EOF was encountered. Put an
1382: * error message to stderr buffer.
1383: */
1.197 djm 1384: snprintf(buf, sizeof buf,
1385: "write stdout: %.50s\r\n", strerror(errno));
1.11 markus 1386: buffer_append(&stderr_buffer, buf, strlen(buf));
1387: quit_pending = 1;
1388: return;
1389: }
1390: }
1391: /* Consume printed data from the buffer. */
1392: buffer_consume(&stdout_buffer, len);
1393: }
1394: /* Write buffered output to stderr. */
1395: if (FD_ISSET(fileno(stderr), writeset)) {
1396: /* Write as much data as possible. */
1397: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1398: buffer_len(&stderr_buffer));
1.11 markus 1399: if (len <= 0) {
1.64 markus 1400: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1401: len = 0;
1402: else {
1.197 djm 1403: /*
1404: * EOF or error, but can't even print
1405: * error message.
1406: */
1.11 markus 1407: quit_pending = 1;
1408: return;
1409: }
1410: }
1411: /* Consume printed characters from the buffer. */
1412: buffer_consume(&stderr_buffer, len);
1413: }
1.1 deraadt 1414: }
1415:
1.13 markus 1416: /*
1.15 markus 1417: * Get packets from the connection input buffer, and process them as long as
1418: * there are packets available.
1419: *
1420: * Any unknown packets received during the actual
1421: * session cause the session to terminate. This is
1422: * intended to make debugging easier since no
1423: * confirmations are sent. Any compatible protocol
1424: * extensions must be negotiated during the
1425: * preparatory phase.
1426: */
1427:
1.77 itojun 1428: static void
1.49 itojun 1429: client_process_buffered_input_packets(void)
1.15 markus 1430: {
1.265 markus 1431: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, active_state);
1.15 markus 1432: }
1433:
1.31 markus 1434: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1435:
1.195 djm 1436: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1437: void *
1438: client_new_escape_filter_ctx(int escape_char)
1439: {
1440: struct escape_filter_ctx *ret;
1441:
1.255 djm 1442: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1443: ret->escape_pending = 0;
1444: ret->escape_char = escape_char;
1445: return (void *)ret;
1446: }
1447:
1.198 djm 1448: /* Free the escape filter context on channel free */
1449: void
1450: client_filter_cleanup(int cid, void *ctx)
1451: {
1.250 djm 1452: free(ctx);
1.198 djm 1453: }
1454:
1.195 djm 1455: int
1456: client_simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1457: {
1.190 djm 1458: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1459: return 0;
1460:
1.195 djm 1461: return process_escapes(c, &c->input, &c->output, &c->extended,
1462: buf, len);
1.30 markus 1463: }
1464:
1.77 itojun 1465: static void
1.60 markus 1466: client_channel_closed(int id, void *arg)
1467: {
1.83 markus 1468: channel_cancel_cleanup(id);
1.60 markus 1469: session_closed = 1;
1.233 djm 1470: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1471: }
1472:
1.15 markus 1473: /*
1.13 markus 1474: * Implements the interactive session with the server. This is called after
1475: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1476: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1477: * used as an escape character for terminating or suspending the session.
1.13 markus 1478: */
1.1 deraadt 1479:
1.20 markus 1480: int
1.30 markus 1481: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1482: {
1.46 markus 1483: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1484: double start_time, total_time;
1.265 markus 1485: int r, max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1.200 markus 1486: u_int64_t ibytes, obytes;
1.130 avsm 1487: u_int nalloc = 0;
1.11 markus 1488: char buf[100];
1489:
1490: debug("Entering interactive session.");
1491:
1492: start_time = get_current_time();
1493:
1494: /* Initialize variables. */
1.195 djm 1495: escape_pending1 = 0;
1.11 markus 1496: last_was_cr = 1;
1497: exit_status = -1;
1498: stdin_eof = 0;
1499: buffer_high = 64 * 1024;
1500: connection_in = packet_get_connection_in();
1501: connection_out = packet_get_connection_out();
1.46 markus 1502: max_fd = MAX(connection_in, connection_out);
1503:
1504: if (!compat20) {
1.63 markus 1505: /* enable nonblocking unless tty */
1506: if (!isatty(fileno(stdin)))
1507: set_nonblock(fileno(stdin));
1508: if (!isatty(fileno(stdout)))
1509: set_nonblock(fileno(stdout));
1510: if (!isatty(fileno(stderr)))
1511: set_nonblock(fileno(stderr));
1.46 markus 1512: max_fd = MAX(max_fd, fileno(stdin));
1513: max_fd = MAX(max_fd, fileno(stdout));
1514: max_fd = MAX(max_fd, fileno(stderr));
1515: }
1.11 markus 1516: quit_pending = 0;
1.195 djm 1517: escape_char1 = escape_char_arg;
1.11 markus 1518:
1519: /* Initialize buffers. */
1520: buffer_init(&stdin_buffer);
1521: buffer_init(&stdout_buffer);
1522: buffer_init(&stderr_buffer);
1523:
1.15 markus 1524: client_init_dispatch();
1525:
1.105 markus 1526: /*
1527: * Set signal handlers, (e.g. to restore non-blocking mode)
1528: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1529: */
1.131 djm 1530: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1531: signal(SIGHUP, signal_handler);
1.105 markus 1532: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1533: signal(SIGINT, signal_handler);
1534: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1535: signal(SIGQUIT, signal_handler);
1536: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1537: signal(SIGTERM, signal_handler);
1.132 djm 1538: signal(SIGWINCH, window_change_handler);
1.11 markus 1539:
1540: if (have_pty)
1.233 djm 1541: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1542:
1.48 markus 1543: if (compat20) {
1544: session_ident = ssh2_chan_id;
1.232 djm 1545: if (session_ident != -1) {
1546: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1547: channel_register_filter(session_ident,
1548: client_simple_escape_filter, NULL,
1549: client_filter_cleanup,
1550: client_new_escape_filter_ctx(
1551: escape_char_arg));
1552: }
1.60 markus 1553: channel_register_cleanup(session_ident,
1.143 djm 1554: client_channel_closed, 0);
1.232 djm 1555: }
1.48 markus 1556: } else {
1557: /* Check if we should immediately send eof on stdin. */
1.16 markus 1558: client_check_initial_eof_on_stdin();
1.48 markus 1559: }
1.30 markus 1560:
1.11 markus 1561: /* Main loop of the client for the interactive session mode. */
1562: while (!quit_pending) {
1563:
1.13 markus 1564: /* Process buffered packets sent by the server. */
1.11 markus 1565: client_process_buffered_input_packets();
1566:
1.60 markus 1567: if (compat20 && session_closed && !channel_still_open())
1568: break;
1569:
1.263 markus 1570: rekeying = (active_state->kex != NULL && !active_state->kex->done);
1.16 markus 1571:
1.56 markus 1572: if (rekeying) {
1573: debug("rekeying in progress");
1574: } else {
1575: /*
1576: * Make packets of buffered stdin data, and buffer
1577: * them for sending to the server.
1578: */
1579: if (!compat20)
1580: client_make_packets_from_stdin_data();
1.11 markus 1581:
1.56 markus 1582: /*
1583: * Make packets from buffered channel data, and
1584: * enqueue them for sending to the server.
1585: */
1586: if (packet_not_very_much_data_to_write())
1587: channel_output_poll();
1.11 markus 1588:
1.56 markus 1589: /*
1590: * Check if the window size has changed, and buffer a
1591: * message about it to the server if so.
1592: */
1593: client_check_window_change();
1.11 markus 1594:
1.56 markus 1595: if (quit_pending)
1596: break;
1597: }
1.13 markus 1598: /*
1599: * Wait until we have something to do (something becomes
1600: * available on one of the descriptors).
1601: */
1.81 markus 1602: max_fd2 = max_fd;
1.56 markus 1603: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1604: &max_fd2, &nalloc, rekeying);
1.11 markus 1605:
1606: if (quit_pending)
1607: break;
1608:
1.56 markus 1609: /* Do channel operations unless rekeying in progress. */
1610: if (!rekeying) {
1611: channel_after_select(readset, writeset);
1.108 markus 1612: if (need_rekeying || packet_need_rekeying()) {
1613: debug("need rekeying");
1.263 markus 1614: active_state->kex->done = 0;
1.265 markus 1615: if ((r = kex_send_kexinit(active_state)) != 0)
1616: fatal("%s: kex_send_kexinit: %s",
1617: __func__, ssh_err(r));
1.56 markus 1618: need_rekeying = 0;
1619: }
1620: }
1.11 markus 1621:
1.17 markus 1622: /* Buffer input from the connection. */
1.46 markus 1623: client_process_net_input(readset);
1.17 markus 1624:
1625: if (quit_pending)
1626: break;
1.11 markus 1627:
1.17 markus 1628: if (!compat20) {
1629: /* Buffer data from stdin */
1.46 markus 1630: client_process_input(readset);
1.17 markus 1631: /*
1632: * Process output to stdout and stderr. Output to
1633: * the connection is processed elsewhere (above).
1634: */
1.46 markus 1635: client_process_output(writeset);
1.214 andreas 1636: }
1637:
1638: if (session_resumed) {
1639: connection_in = packet_get_connection_in();
1640: connection_out = packet_get_connection_out();
1641: max_fd = MAX(max_fd, connection_out);
1642: max_fd = MAX(max_fd, connection_in);
1643: session_resumed = 0;
1.17 markus 1644: }
1.11 markus 1645:
1.197 djm 1646: /*
1647: * Send as much buffered packet data as possible to the
1648: * sender.
1649: */
1.46 markus 1650: if (FD_ISSET(connection_out, writeset))
1.11 markus 1651: packet_write_poll();
1.222 djm 1652:
1653: /*
1654: * If we are a backgrounded control master, and the
1655: * timeout has expired without any active client
1656: * connections, then quit.
1657: */
1658: if (control_persist_exit_time > 0) {
1.251 dtucker 1659: if (monotime() >= control_persist_exit_time) {
1.222 djm 1660: debug("ControlPersist timeout expired");
1661: break;
1662: }
1663: }
1.11 markus 1664: }
1.250 djm 1665: free(readset);
1666: free(writeset);
1.11 markus 1667:
1668: /* Terminate the session. */
1669:
1670: /* Stop watching for window change. */
1.132 djm 1671: signal(SIGWINCH, SIG_DFL);
1.211 andreas 1672:
1.213 stevesk 1673: if (compat20) {
1674: packet_start(SSH2_MSG_DISCONNECT);
1675: packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1676: packet_put_cstring("disconnected by user");
1.219 djm 1677: packet_put_cstring(""); /* language tag */
1.213 stevesk 1678: packet_send();
1679: packet_write_wait();
1680: }
1.11 markus 1681:
1.76 markus 1682: channel_free_all();
1.11 markus 1683:
1.75 markus 1684: if (have_pty)
1.233 djm 1685: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1686:
1687: /* restore blocking io */
1688: if (!isatty(fileno(stdin)))
1689: unset_nonblock(fileno(stdin));
1690: if (!isatty(fileno(stdout)))
1691: unset_nonblock(fileno(stdout));
1692: if (!isatty(fileno(stderr)))
1693: unset_nonblock(fileno(stderr));
1.116 dtucker 1694:
1695: /*
1696: * If there was no shell or command requested, there will be no remote
1697: * exit status to be returned. In that case, clear error code if the
1698: * connection was deliberately terminated at this end.
1699: */
1700: if (no_shell_flag && received_signal == SIGTERM) {
1701: received_signal = 0;
1702: exit_status = 0;
1703: }
1.75 markus 1704:
1.113 markus 1705: if (received_signal)
1.89 itojun 1706: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1707:
1.13 markus 1708: /*
1709: * In interactive mode (with pseudo tty) display a message indicating
1710: * that the connection has been closed.
1711: */
1.11 markus 1712: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.197 djm 1713: snprintf(buf, sizeof buf,
1714: "Connection to %.64s closed.\r\n", host);
1.11 markus 1715: buffer_append(&stderr_buffer, buf, strlen(buf));
1716: }
1.70 markus 1717:
1.11 markus 1718: /* Output any buffered data for stdout. */
1.231 djm 1719: if (buffer_len(&stdout_buffer) > 0) {
1.230 djm 1720: len = atomicio(vwrite, fileno(stdout),
1721: buffer_ptr(&stdout_buffer), buffer_len(&stdout_buffer));
1.231 djm 1722: if (len < 0 || (u_int)len != buffer_len(&stdout_buffer))
1.11 markus 1723: error("Write failed flushing stdout buffer.");
1.231 djm 1724: else
1725: buffer_consume(&stdout_buffer, len);
1.11 markus 1726: }
1727:
1728: /* Output any buffered data for stderr. */
1.231 djm 1729: if (buffer_len(&stderr_buffer) > 0) {
1.230 djm 1730: len = atomicio(vwrite, fileno(stderr),
1731: buffer_ptr(&stderr_buffer), buffer_len(&stderr_buffer));
1.231 djm 1732: if (len < 0 || (u_int)len != buffer_len(&stderr_buffer))
1.11 markus 1733: error("Write failed flushing stderr buffer.");
1.231 djm 1734: else
1735: buffer_consume(&stderr_buffer, len);
1.11 markus 1736: }
1737:
1738: /* Clear and free any buffers. */
1739: memset(buf, 0, sizeof(buf));
1740: buffer_free(&stdin_buffer);
1741: buffer_free(&stdout_buffer);
1742: buffer_free(&stderr_buffer);
1743:
1744: /* Report bytes transferred, and transfer rates. */
1745: total_time = get_current_time() - start_time;
1.263 markus 1746: packet_get_bytes(&ibytes, &obytes);
1.200 markus 1747: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1748: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1749: if (total_time > 0)
1.200 markus 1750: verbose("Bytes per second: sent %.1f, received %.1f",
1751: obytes / total_time, ibytes / total_time);
1.11 markus 1752: /* Return the exit status of the program. */
1753: debug("Exit status %d", exit_status);
1754: return exit_status;
1.15 markus 1755: }
1756:
1757: /*********/
1758:
1.264 markus 1759: static int
1.94 markus 1760: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1761: {
1.42 markus 1762: u_int data_len;
1.15 markus 1763: char *data = packet_get_string(&data_len);
1.93 markus 1764: packet_check_eom();
1.15 markus 1765: buffer_append(&stdout_buffer, data, data_len);
1.258 djm 1766: explicit_bzero(data, data_len);
1.250 djm 1767: free(data);
1.264 markus 1768: return 0;
1.15 markus 1769: }
1.264 markus 1770: static int
1.94 markus 1771: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1772: {
1.42 markus 1773: u_int data_len;
1.15 markus 1774: char *data = packet_get_string(&data_len);
1.93 markus 1775: packet_check_eom();
1.15 markus 1776: buffer_append(&stderr_buffer, data, data_len);
1.258 djm 1777: explicit_bzero(data, data_len);
1.250 djm 1778: free(data);
1.264 markus 1779: return 0;
1.15 markus 1780: }
1.264 markus 1781: static int
1.94 markus 1782: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1783: {
1784: exit_status = packet_get_int();
1.93 markus 1785: packet_check_eom();
1.15 markus 1786: /* Acknowledge the exit. */
1787: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1788: packet_send();
1789: /*
1790: * Must wait for packet to be sent since we are
1791: * exiting the loop.
1792: */
1793: packet_write_wait();
1794: /* Flag that we want to exit. */
1795: quit_pending = 1;
1.264 markus 1796: return 0;
1.15 markus 1797: }
1.267 djm 1798:
1.264 markus 1799: static int
1.115 markus 1800: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1801: {
1802: Channel *c = NULL;
1.262 djm 1803: int r, remote_id, sock;
1.115 markus 1804:
1805: /* Read the remote channel number from the message. */
1806: remote_id = packet_get_int();
1807: packet_check_eom();
1808:
1809: /*
1810: * Get a connection to the local authentication agent (this may again
1811: * get forwarded).
1812: */
1.262 djm 1813: if ((r = ssh_get_authentication_socket(&sock)) != 0 &&
1814: r != SSH_ERR_AGENT_NOT_PRESENT)
1815: debug("%s: ssh_get_authentication_socket: %s",
1816: __func__, ssh_err(r));
1817:
1.115 markus 1818:
1819: /*
1820: * If we could not connect the agent, send an error message back to
1821: * the server. This should never happen unless the agent dies,
1822: * because authentication forwarding is only enabled if we have an
1823: * agent.
1824: */
1825: if (sock >= 0) {
1826: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1827: -1, 0, 0, 0, "authentication agent connection", 1);
1828: c->remote_id = remote_id;
1829: c->force_drain = 1;
1830: }
1831: if (c == NULL) {
1832: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1833: packet_put_int(remote_id);
1834: } else {
1835: /* Send a confirmation to the remote host. */
1836: debug("Forwarding authentication connection.");
1837: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1838: packet_put_int(remote_id);
1839: packet_put_int(c->self);
1840: }
1841: packet_send();
1.264 markus 1842: return 0;
1.115 markus 1843: }
1.15 markus 1844:
1.77 itojun 1845: static Channel *
1.40 markus 1846: client_request_forwarded_tcpip(const char *request_type, int rchan)
1847: {
1.103 deraadt 1848: Channel *c = NULL;
1.40 markus 1849: char *listen_address, *originator_address;
1.208 djm 1850: u_short listen_port, originator_port;
1.40 markus 1851:
1852: /* Get rest of the packet */
1853: listen_address = packet_get_string(NULL);
1854: listen_port = packet_get_int();
1855: originator_address = packet_get_string(NULL);
1856: originator_port = packet_get_int();
1.93 markus 1857: packet_check_eom();
1.40 markus 1858:
1.261 millert 1859: debug("%s: listen %s port %d, originator %s port %d", __func__,
1860: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1861:
1.260 markus 1862: c = channel_connect_by_listen_address(listen_address, listen_port,
1.191 djm 1863: "forwarded-tcpip", originator_address);
1.40 markus 1864:
1.250 djm 1865: free(originator_address);
1866: free(listen_address);
1.40 markus 1867: return c;
1868: }
1869:
1.103 deraadt 1870: static Channel *
1.261 millert 1871: client_request_forwarded_streamlocal(const char *request_type, int rchan)
1872: {
1873: Channel *c = NULL;
1874: char *listen_path;
1875:
1876: /* Get the remote path. */
1877: listen_path = packet_get_string(NULL);
1878: /* XXX: Skip reserved field for now. */
1879: if (packet_get_string_ptr(NULL) == NULL)
1880: fatal("%s: packet_get_string_ptr failed", __func__);
1881: packet_check_eom();
1882:
1883: debug("%s: %s", __func__, listen_path);
1884:
1885: c = channel_connect_by_listen_path(listen_path,
1886: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1887: free(listen_path);
1888: return c;
1889: }
1890:
1891: static Channel *
1.40 markus 1892: client_request_x11(const char *request_type, int rchan)
1893: {
1894: Channel *c = NULL;
1895: char *originator;
1.208 djm 1896: u_short originator_port;
1.67 markus 1897: int sock;
1.40 markus 1898:
1899: if (!options.forward_x11) {
1900: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1901: error("Warning: this is probably a break-in attempt by a "
1902: "malicious server.");
1.221 djm 1903: return NULL;
1904: }
1.251 dtucker 1905: if (x11_refuse_time != 0 && monotime() >= x11_refuse_time) {
1.221 djm 1906: verbose("Rejected X11 connection after ForwardX11Timeout "
1907: "expired");
1.40 markus 1908: return NULL;
1909: }
1910: originator = packet_get_string(NULL);
1911: if (datafellows & SSH_BUG_X11FWD) {
1912: debug2("buggy server: x11 request w/o originator_port");
1913: originator_port = 0;
1914: } else {
1915: originator_port = packet_get_int();
1916: }
1.93 markus 1917: packet_check_eom();
1.40 markus 1918: /* XXX check permission */
1.47 markus 1919: debug("client_request_x11: request from %s %d", originator,
1920: originator_port);
1.250 djm 1921: free(originator);
1.40 markus 1922: sock = x11_connect_display();
1.67 markus 1923: if (sock < 0)
1924: return NULL;
1925: c = channel_new("x11",
1926: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1927: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1928: c->force_drain = 1;
1.40 markus 1929: return c;
1930: }
1931:
1.103 deraadt 1932: static Channel *
1.40 markus 1933: client_request_agent(const char *request_type, int rchan)
1934: {
1935: Channel *c = NULL;
1.262 djm 1936: int r, sock;
1.40 markus 1937:
1938: if (!options.forward_agent) {
1939: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1940: error("Warning: this is probably a break-in attempt by a "
1941: "malicious server.");
1.40 markus 1942: return NULL;
1943: }
1.262 djm 1944: if ((r = ssh_get_authentication_socket(&sock)) != 0) {
1945: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1946: debug("%s: ssh_get_authentication_socket: %s",
1947: __func__, ssh_err(r));
1.67 markus 1948: return NULL;
1.262 djm 1949: }
1.67 markus 1950: c = channel_new("authentication agent connection",
1951: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1952: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1953: "authentication agent connection", 1);
1.82 markus 1954: c->force_drain = 1;
1.40 markus 1955: return c;
1.180 djm 1956: }
1957:
1958: int
1959: client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1960: {
1961: Channel *c;
1962: int fd;
1963:
1964: if (tun_mode == SSH_TUNMODE_NO)
1965: return 0;
1966:
1967: if (!compat20) {
1.207 stevesk 1968: error("Tunnel forwarding is not supported for protocol 1");
1.180 djm 1969: return -1;
1970: }
1971:
1972: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1973:
1974: /* Open local tunnel device */
1975: if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1976: error("Tunnel device open failed.");
1977: return -1;
1978: }
1979:
1980: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1981: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1982: c->datagram = 1;
1983:
1984: packet_start(SSH2_MSG_CHANNEL_OPEN);
1985: packet_put_cstring("tun@openssh.com");
1986: packet_put_int(c->self);
1987: packet_put_int(c->local_window_max);
1988: packet_put_int(c->local_maxpacket);
1989: packet_put_int(tun_mode);
1990: packet_put_int(remote_tun);
1991: packet_send();
1992:
1993: return 0;
1.40 markus 1994: }
1995:
1.22 markus 1996: /* XXXX move to generic input handler */
1.264 markus 1997: static int
1.94 markus 1998: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1999: {
2000: Channel *c = NULL;
2001: char *ctype;
2002: int rchan;
1.102 markus 2003: u_int rmaxpack, rwindow, len;
1.22 markus 2004:
2005: ctype = packet_get_string(&len);
2006: rchan = packet_get_int();
2007: rwindow = packet_get_int();
2008: rmaxpack = packet_get_int();
2009:
1.24 markus 2010: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 2011: ctype, rchan, rwindow, rmaxpack);
2012:
1.40 markus 2013: if (strcmp(ctype, "forwarded-tcpip") == 0) {
2014: c = client_request_forwarded_tcpip(ctype, rchan);
1.261 millert 2015: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
2016: c = client_request_forwarded_streamlocal(ctype, rchan);
1.40 markus 2017: } else if (strcmp(ctype, "x11") == 0) {
2018: c = client_request_x11(ctype, rchan);
2019: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
2020: c = client_request_agent(ctype, rchan);
1.22 markus 2021: }
2022: /* XXX duplicate : */
2023: if (c != NULL) {
2024: debug("confirm %s", ctype);
2025: c->remote_id = rchan;
2026: c->remote_window = rwindow;
2027: c->remote_maxpacket = rmaxpack;
1.69 markus 2028: if (c->type != SSH_CHANNEL_CONNECTING) {
2029: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
2030: packet_put_int(c->remote_id);
2031: packet_put_int(c->self);
2032: packet_put_int(c->local_window);
2033: packet_put_int(c->local_maxpacket);
2034: packet_send();
2035: }
1.22 markus 2036: } else {
2037: debug("failure %s", ctype);
2038: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
2039: packet_put_int(rchan);
2040: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 2041: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 2042: packet_put_cstring("open failed");
1.66 markus 2043: packet_put_cstring("");
2044: }
1.22 markus 2045: packet_send();
2046: }
1.250 djm 2047: free(ctype);
1.264 markus 2048: return 0;
1.22 markus 2049: }
1.267 djm 2050:
1.264 markus 2051: static int
1.94 markus 2052: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 2053: {
2054: Channel *c = NULL;
1.123 djm 2055: int exitval, id, reply, success = 0;
1.48 markus 2056: char *rtype;
2057:
2058: id = packet_get_int();
2059: rtype = packet_get_string(NULL);
2060: reply = packet_get_char();
2061:
2062: debug("client_input_channel_req: channel %d rtype %s reply %d",
2063: id, rtype, reply);
2064:
1.128 djm 2065: if (id == -1) {
2066: error("client_input_channel_req: request for channel -1");
2067: } else if ((c = channel_lookup(id)) == NULL) {
1.197 djm 2068: error("client_input_channel_req: channel %d: "
2069: "unknown channel", id);
1.193 markus 2070: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
2071: packet_check_eom();
2072: chan_rcvd_eow(c);
1.48 markus 2073: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 2074: exitval = packet_get_int();
1.217 djm 2075: if (c->ctl_chan != -1) {
2076: mux_exit_message(c, exitval);
1.215 djm 2077: success = 1;
2078: } else if (id == session_ident) {
2079: /* Record exit value of local session */
1.123 djm 2080: success = 1;
2081: exit_status = exitval;
1.215 djm 2082: } else {
1.218 djm 2083: /* Probably for a mux channel that has already closed */
2084: debug("%s: no sink for exit-status on channel %d",
2085: __func__, id);
1.123 djm 2086: }
1.93 markus 2087: packet_check_eom();
1.48 markus 2088: }
1.259 djm 2089: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.48 markus 2090: packet_start(success ?
2091: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.205 markus 2092: packet_put_int(c->remote_id);
1.48 markus 2093: packet_send();
2094: }
1.250 djm 2095: free(rtype);
1.264 markus 2096: return 0;
1.48 markus 2097: }
1.267 djm 2098:
1.269 djm 2099: struct hostkeys_update_ctx {
2100: /* The hostname and (optionally) IP address string for the server */
2101: char *host_str, *ip_str;
2102:
2103: /*
2104: * Keys received from the server and a flag for each indicating
2105: * whether they already exist in known_hosts.
2106: * keys_seen is filled in by hostkeys_find() and later (for new
2107: * keys) by client_global_hostkeys_private_confirm().
2108: */
2109: struct sshkey **keys;
2110: int *keys_seen;
2111: size_t nkeys;
2112:
2113: size_t nnew;
2114:
2115: /*
2116: * Keys that are in known_hosts, but were not present in the update
2117: * from the server (i.e. scheduled to be deleted).
2118: * Filled in by hostkeys_find().
2119: */
2120: struct sshkey **old_keys;
2121: size_t nold;
2122: };
2123:
2124: static void
2125: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
2126: {
2127: size_t i;
2128:
2129: if (ctx == NULL)
2130: return;
2131: for (i = 0; i < ctx->nkeys; i++)
2132: sshkey_free(ctx->keys[i]);
2133: free(ctx->keys);
2134: free(ctx->keys_seen);
2135: for (i = 0; i < ctx->nold; i++)
2136: sshkey_free(ctx->old_keys[i]);
2137: free(ctx->old_keys);
2138: free(ctx->host_str);
2139: free(ctx->ip_str);
2140: free(ctx);
2141: }
2142:
2143: static int
2144: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
2145: {
2146: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2147: size_t i;
2148: struct sshkey **tmp;
2149:
2150: if (l->status != HKF_STATUS_MATCHED || l->key == NULL ||
2151: l->key->type == KEY_RSA1)
2152: return 0;
2153:
2154: /* Mark off keys we've already seen for this host */
2155: for (i = 0; i < ctx->nkeys; i++) {
2156: if (sshkey_equal(l->key, ctx->keys[i])) {
2157: debug3("%s: found %s key at %s:%ld", __func__,
2158: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
2159: ctx->keys_seen[i] = 1;
2160: return 0;
2161: }
2162: }
2163: /* This line contained a key that not offered by the server */
2164: debug3("%s: deprecated %s key at %s:%ld", __func__,
2165: sshkey_ssh_name(l->key), l->path, l->linenum);
2166: if ((tmp = reallocarray(ctx->old_keys, ctx->nold + 1,
2167: sizeof(*ctx->old_keys))) == NULL)
2168: fatal("%s: reallocarray failed nold = %zu",
2169: __func__, ctx->nold);
2170: ctx->old_keys = tmp;
2171: ctx->old_keys[ctx->nold++] = l->key;
2172: l->key = NULL;
2173:
2174: return 0;
2175: }
2176:
2177: static void
2178: update_known_hosts(struct hostkeys_update_ctx *ctx)
2179: {
1.271 djm 2180: int r, was_raw = 0;
2181: int loglevel = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK ?
1.269 djm 2182: SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
2183: char *fp, *response;
2184: size_t i;
2185:
2186: for (i = 0; i < ctx->nkeys; i++) {
2187: if (ctx->keys_seen[i] != 2)
2188: continue;
2189: if ((fp = sshkey_fingerprint(ctx->keys[i],
2190: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2191: fatal("%s: sshkey_fingerprint failed", __func__);
2192: do_log2(loglevel, "Learned new hostkey: %s %s",
2193: sshkey_type(ctx->keys[i]), fp);
2194: free(fp);
2195: }
2196: for (i = 0; i < ctx->nold; i++) {
2197: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2198: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2199: fatal("%s: sshkey_fingerprint failed", __func__);
2200: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2201: sshkey_type(ctx->old_keys[i]), fp);
2202: free(fp);
2203: }
2204: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2205: if (get_saved_tio() != NULL) {
2206: leave_raw_mode(1);
2207: was_raw = 1;
2208: }
1.269 djm 2209: response = NULL;
2210: for (i = 0; !quit_pending && i < 3; i++) {
2211: free(response);
2212: response = read_passphrase("Accept updated hostkeys? "
2213: "(yes/no): ", RP_ECHO);
2214: if (strcasecmp(response, "yes") == 0)
2215: break;
2216: else if (quit_pending || response == NULL ||
2217: strcasecmp(response, "no") == 0) {
2218: options.update_hostkeys = 0;
2219: break;
2220: } else {
2221: do_log2(loglevel, "Please enter "
2222: "\"yes\" or \"no\"");
2223: }
2224: }
2225: if (quit_pending || i >= 3 || response == NULL)
2226: options.update_hostkeys = 0;
2227: free(response);
1.271 djm 2228: if (was_raw)
2229: enter_raw_mode(1);
1.269 djm 2230: }
2231:
2232: /*
2233: * Now that all the keys are verified, we can go ahead and replace
2234: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2235: * cancel the operation).
2236: */
2237: if (options.update_hostkeys != 0 &&
2238: (r = hostfile_replace_entries(options.user_hostfiles[0],
2239: ctx->host_str, ctx->ip_str, ctx->keys, ctx->nkeys,
2240: options.hash_known_hosts, 0,
2241: options.fingerprint_hash)) != 0)
2242: error("%s: hostfile_replace_entries failed: %s",
2243: __func__, ssh_err(r));
2244: }
2245:
2246: static void
2247: client_global_hostkeys_private_confirm(int type, u_int32_t seq, void *_ctx)
2248: {
2249: struct ssh *ssh = active_state; /* XXX */
2250: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2251: size_t i, ndone;
2252: struct sshbuf *signdata;
2253: int r;
2254: const u_char *sig;
2255: size_t siglen;
2256:
2257: if (ctx->nnew == 0)
2258: fatal("%s: ctx->nnew == 0", __func__); /* sanity */
2259: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2260: error("Server failed to confirm ownership of "
2261: "private host keys");
2262: hostkeys_update_ctx_free(ctx);
2263: return;
2264: }
2265: if ((signdata = sshbuf_new()) == NULL)
2266: fatal("%s: sshbuf_new failed", __func__);
2267: /* Don't want to accidentally accept an unbound signature */
2268: if (ssh->kex->session_id_len == 0)
2269: fatal("%s: ssh->kex->session_id_len == 0", __func__);
2270: /*
2271: * Expect a signature for each of the ctx->nnew private keys we
2272: * haven't seen before. They will be in the same order as the
2273: * ctx->keys where the corresponding ctx->keys_seen[i] == 0.
2274: */
2275: for (ndone = i = 0; i < ctx->nkeys; i++) {
2276: if (ctx->keys_seen[i])
2277: continue;
2278: /* Prepare data to be signed: session ID, unique string, key */
2279: sshbuf_reset(signdata);
1.270 djm 2280: if ( (r = sshbuf_put_cstring(signdata,
2281: "hostkeys-prove-00@openssh.com")) != 0 ||
2282: (r = sshbuf_put_string(signdata, ssh->kex->session_id,
1.269 djm 2283: ssh->kex->session_id_len)) != 0 ||
2284: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
2285: fatal("%s: failed to prepare signature: %s",
2286: __func__, ssh_err(r));
2287: /* Extract and verify signature */
2288: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
2289: error("%s: couldn't parse message: %s",
2290: __func__, ssh_err(r));
2291: goto out;
2292: }
2293: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
2294: sshbuf_ptr(signdata), sshbuf_len(signdata), 0)) != 0) {
2295: error("%s: server gave bad signature for %s key %zu",
2296: __func__, sshkey_type(ctx->keys[i]), i);
2297: goto out;
2298: }
2299: /* Key is good. Mark it as 'seen' */
2300: ctx->keys_seen[i] = 2;
2301: ndone++;
2302: }
2303: if (ndone != ctx->nnew)
2304: fatal("%s: ndone != ctx->nnew (%zu / %zu)", __func__,
2305: ndone, ctx->nnew); /* Shouldn't happen */
2306: ssh_packet_check_eom(ssh);
2307:
2308: /* Make the edits to known_hosts */
2309: update_known_hosts(ctx);
2310: out:
2311: hostkeys_update_ctx_free(ctx);
2312: }
2313:
1.267 djm 2314: /*
1.270 djm 2315: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2316: * the server's hostkeys. The keys are checked against the user's
2317: * HostkeyAlgorithms preference before they are accepted.
2318: */
2319: static int
2320: client_input_hostkeys(void)
2321: {
1.269 djm 2322: struct ssh *ssh = active_state; /* XXX */
1.267 djm 2323: const u_char *blob = NULL;
1.269 djm 2324: size_t i, len = 0;
1.267 djm 2325: struct sshbuf *buf = NULL;
1.269 djm 2326: struct sshkey *key = NULL, **tmp;
2327: int r;
2328: char *fp;
1.267 djm 2329: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2330: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2331: struct hostkeys_update_ctx *ctx = NULL;
1.267 djm 2332:
2333: if (hostkeys_seen)
2334: fatal("%s: server already sent hostkeys", __func__);
1.269 djm 2335: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2336: options.batch_mode)
2337: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2338: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2339: return 1;
1.272 djm 2340:
2341: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2342: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2343: sshkey_free(key);
2344: key = NULL;
1.269 djm 2345: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
2346: error("%s: couldn't parse message: %s",
2347: __func__, ssh_err(r));
2348: goto out;
2349: }
1.270 djm 2350: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
2351: error("%s: parse key: %s", __func__, ssh_err(r));
2352: goto out;
2353: }
1.267 djm 2354: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2355: SSH_FP_DEFAULT);
2356: debug3("%s: received %s key %s", __func__,
2357: sshkey_type(key), fp);
2358: free(fp);
2359: /* Check that the key is accepted in HostkeyAlgorithms */
2360: if (options.hostkeyalgorithms != NULL &&
2361: match_pattern_list(sshkey_ssh_name(key),
2362: options.hostkeyalgorithms,
2363: strlen(options.hostkeyalgorithms), 0) != 1) {
2364: debug3("%s: %s key not permitted by HostkeyAlgorithms",
2365: __func__, sshkey_ssh_name(key));
2366: continue;
2367: }
1.269 djm 2368: /* Skip certs */
2369: if (sshkey_is_cert(key)) {
2370: debug3("%s: %s key is a certificate; skipping",
2371: __func__, sshkey_ssh_name(key));
2372: continue;
2373: }
2374: /* Ensure keys are unique */
2375: for (i = 0; i < ctx->nkeys; i++) {
2376: if (sshkey_equal(key, ctx->keys[i])) {
2377: error("%s: received duplicated %s host key",
2378: __func__, sshkey_ssh_name(key));
2379: goto out;
2380: }
2381: }
2382: /* Key is good, record it */
2383: if ((tmp = reallocarray(ctx->keys, ctx->nkeys + 1,
2384: sizeof(*ctx->keys))) == NULL)
2385: fatal("%s: reallocarray failed nkeys = %zu",
2386: __func__, ctx->nkeys);
2387: ctx->keys = tmp;
2388: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2389: key = NULL;
2390: }
2391:
1.269 djm 2392: if (ctx->nkeys == 0) {
1.270 djm 2393: debug("%s: server sent no hostkeys", __func__);
1.267 djm 2394: goto out;
2395: }
1.270 djm 2396:
1.269 djm 2397: if ((ctx->keys_seen = calloc(ctx->nkeys,
2398: sizeof(*ctx->keys_seen))) == NULL)
2399: fatal("%s: calloc failed", __func__);
1.267 djm 2400:
1.268 djm 2401: get_hostfile_hostname_ipaddr(host,
2402: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2403: options.port, &ctx->host_str,
2404: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2405:
1.269 djm 2406: /* Find which keys we already know about. */
2407: if ((r = hostkeys_foreach(options.user_hostfiles[0], hostkeys_find,
2408: ctx, ctx->host_str, ctx->ip_str,
2409: HKF_WANT_PARSE_KEY|HKF_WANT_MATCH)) != 0) {
2410: error("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1.267 djm 2411: goto out;
2412: }
2413:
1.269 djm 2414: /* Figure out if we have any new keys to add */
2415: ctx->nnew = 0;
2416: for (i = 0; i < ctx->nkeys; i++) {
2417: if (!ctx->keys_seen[i])
2418: ctx->nnew++;
2419: }
2420:
2421: debug3("%s: %zu keys from server: %zu new, %zu retained. %zu to remove",
2422: __func__, ctx->nkeys, ctx->nnew, ctx->nkeys - ctx->nnew, ctx->nold);
2423:
2424: if (ctx->nnew == 0 && ctx->nold != 0) {
2425: /* We have some keys to remove. Just do it. */
2426: update_known_hosts(ctx);
2427: } else if (ctx->nnew != 0) {
2428: /*
2429: * We have received hitherto-unseen keys from the server.
2430: * Ask the server to confirm ownership of the private halves.
2431: */
2432: debug3("%s: asking server to prove ownership for %zu keys",
2433: __func__, ctx->nnew);
2434: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2435: (r = sshpkt_put_cstring(ssh,
1.270 djm 2436: "hostkeys-prove-00@openssh.com")) != 0 ||
1.269 djm 2437: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
2438: fatal("%s: cannot prepare packet: %s",
2439: __func__, ssh_err(r));
2440: if ((buf = sshbuf_new()) == NULL)
2441: fatal("%s: sshbuf_new", __func__);
2442: for (i = 0; i < ctx->nkeys; i++) {
2443: if (ctx->keys_seen[i])
2444: continue;
2445: sshbuf_reset(buf);
2446: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0)
2447: fatal("%s: sshkey_putb: %s",
2448: __func__, ssh_err(r));
2449: if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
2450: fatal("%s: sshpkt_put_string: %s",
2451: __func__, ssh_err(r));
2452: }
2453: if ((r = sshpkt_send(ssh)) != 0)
2454: fatal("%s: sshpkt_send: %s", __func__, ssh_err(r));
2455: client_register_global_confirm(
2456: client_global_hostkeys_private_confirm, ctx);
2457: ctx = NULL; /* will be freed in callback */
2458: }
2459:
1.267 djm 2460: /* Success */
2461: out:
1.269 djm 2462: hostkeys_update_ctx_free(ctx);
1.267 djm 2463: sshkey_free(key);
2464: sshbuf_free(buf);
1.269 djm 2465: /*
2466: * NB. Return success for all cases. The server doesn't need to know
2467: * what the client does with its hosts file.
2468: */
2469: return 1;
1.267 djm 2470: }
2471:
1.264 markus 2472: static int
1.95 markus 2473: client_input_global_request(int type, u_int32_t seq, void *ctxt)
2474: {
2475: char *rtype;
2476: int want_reply;
2477: int success = 0;
2478:
1.267 djm 2479: rtype = packet_get_cstring(NULL);
1.95 markus 2480: want_reply = packet_get_char();
1.117 markus 2481: debug("client_input_global_request: rtype %s want_reply %d",
2482: rtype, want_reply);
1.270 djm 2483: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.267 djm 2484: success = client_input_hostkeys();
1.95 markus 2485: if (want_reply) {
2486: packet_start(success ?
2487: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
2488: packet_send();
2489: packet_write_wait();
2490: }
1.250 djm 2491: free(rtype);
1.264 markus 2492: return 0;
1.95 markus 2493: }
1.22 markus 2494:
1.123 djm 2495: void
1.129 deraadt 2496: client_session2_setup(int id, int want_tty, int want_subsystem,
1.190 djm 2497: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
1.123 djm 2498: {
2499: int len;
1.132 djm 2500: Channel *c = NULL;
1.123 djm 2501:
2502: debug2("%s: id %d", __func__, id);
2503:
1.132 djm 2504: if ((c = channel_lookup(id)) == NULL)
2505: fatal("client_session2_setup: channel %d: unknown channel", id);
1.224 djm 2506:
2507: packet_set_interactive(want_tty,
2508: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2509:
1.123 djm 2510: if (want_tty) {
2511: struct winsize ws;
2512:
2513: /* Store window size in the packet. */
2514: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
2515: memset(&ws, 0, sizeof(ws));
2516:
1.190 djm 2517: channel_request_start(id, "pty-req", 1);
1.234 djm 2518: client_expect_confirm(id, "PTY allocation", CONFIRM_TTY);
1.123 djm 2519: packet_put_cstring(term != NULL ? term : "");
1.158 deraadt 2520: packet_put_int((u_int)ws.ws_col);
2521: packet_put_int((u_int)ws.ws_row);
2522: packet_put_int((u_int)ws.ws_xpixel);
2523: packet_put_int((u_int)ws.ws_ypixel);
1.194 djm 2524: if (tiop == NULL)
2525: tiop = get_saved_tio();
2526: tty_make_modes(-1, tiop);
1.123 djm 2527: packet_send();
2528: /* XXX wait for reply */
1.132 djm 2529: c->client_tty = 1;
1.123 djm 2530: }
2531:
2532: /* Transfer any environment variables from client to server */
1.126 djm 2533: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2534: int i, j, matched;
2535: char *name, *val;
2536:
2537: debug("Sending environment.");
1.126 djm 2538: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2539: /* Split */
1.126 djm 2540: name = xstrdup(env[i]);
1.123 djm 2541: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2542: free(name);
1.123 djm 2543: continue;
2544: }
2545: *val++ = '\0';
2546:
2547: matched = 0;
2548: for (j = 0; j < options.num_send_env; j++) {
2549: if (match_pattern(name, options.send_env[j])) {
2550: matched = 1;
2551: break;
2552: }
2553: }
2554: if (!matched) {
2555: debug3("Ignored env %s", name);
1.250 djm 2556: free(name);
1.123 djm 2557: continue;
2558: }
2559:
2560: debug("Sending env %s = %s", name, val);
2561: channel_request_start(id, "env", 0);
2562: packet_put_cstring(name);
2563: packet_put_cstring(val);
2564: packet_send();
1.250 djm 2565: free(name);
1.123 djm 2566: }
2567: }
2568:
2569: len = buffer_len(cmd);
2570: if (len > 0) {
2571: if (len > 900)
2572: len = 900;
2573: if (want_subsystem) {
1.190 djm 2574: debug("Sending subsystem: %.*s",
2575: len, (u_char*)buffer_ptr(cmd));
2576: channel_request_start(id, "subsystem", 1);
1.234 djm 2577: client_expect_confirm(id, "subsystem", CONFIRM_CLOSE);
1.123 djm 2578: } else {
1.190 djm 2579: debug("Sending command: %.*s",
2580: len, (u_char*)buffer_ptr(cmd));
2581: channel_request_start(id, "exec", 1);
1.234 djm 2582: client_expect_confirm(id, "exec", CONFIRM_CLOSE);
1.123 djm 2583: }
2584: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
2585: packet_send();
2586: } else {
1.190 djm 2587: channel_request_start(id, "shell", 1);
1.234 djm 2588: client_expect_confirm(id, "shell", CONFIRM_CLOSE);
1.123 djm 2589: packet_send();
2590: }
2591: }
2592:
1.77 itojun 2593: static void
1.49 itojun 2594: client_init_dispatch_20(void)
1.16 markus 2595: {
1.55 markus 2596: dispatch_init(&dispatch_protocol_error);
1.100 markus 2597:
1.16 markus 2598: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2599: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2600: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2601: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 2602: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 2603: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2604: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 2605: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 2606: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.189 djm 2607: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2608: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
1.95 markus 2609: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2610:
2611: /* rekeying */
2612: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2613:
2614: /* global request reply messages */
2615: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2616: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 2617: }
1.197 djm 2618:
1.77 itojun 2619: static void
1.49 itojun 2620: client_init_dispatch_13(void)
1.15 markus 2621: {
2622: dispatch_init(NULL);
2623: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2624: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2625: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
2626: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2627: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2628: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
2629: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2630: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2631: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 2632:
2633: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 2634: &client_input_agent_open : &deny_input_open);
1.39 markus 2635: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2636: &x11_input_open : &deny_input_open);
1.15 markus 2637: }
1.197 djm 2638:
1.77 itojun 2639: static void
1.49 itojun 2640: client_init_dispatch_15(void)
1.15 markus 2641: {
2642: client_init_dispatch_13();
2643: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2644: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2645: }
1.197 djm 2646:
1.79 stevesk 2647: static void
1.49 itojun 2648: client_init_dispatch(void)
1.15 markus 2649: {
1.16 markus 2650: if (compat20)
2651: client_init_dispatch_20();
2652: else if (compat13)
1.15 markus 2653: client_init_dispatch_13();
2654: else
2655: client_init_dispatch_15();
1.232 djm 2656: }
2657:
2658: void
2659: client_stop_mux(void)
2660: {
2661: if (options.control_path != NULL && muxserver_sock != -1)
2662: unlink(options.control_path);
2663: /*
1.247 dtucker 2664: * If we are in persist mode, or don't have a shell, signal that we
2665: * should close when all active channels are closed.
1.232 djm 2666: */
1.247 dtucker 2667: if (options.control_persist || no_shell_flag) {
1.232 djm 2668: session_closed = 1;
1.235 djm 2669: setproctitle("[stopped mux]");
2670: }
1.113 markus 2671: }
2672:
2673: /* client specific fatal cleanup */
2674: void
1.114 markus 2675: cleanup_exit(int i)
1.113 markus 2676: {
1.233 djm 2677: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.113 markus 2678: leave_non_blocking();
1.192 djm 2679: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2680: unlink(options.control_path);
1.223 djm 2681: ssh_kill_proxy_command();
1.114 markus 2682: _exit(i);
1.1 deraadt 2683: }
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