Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.396
1.396 ! djm 1: /* $OpenBSD: clientloop.c,v 1.395 2023/09/04 00:04:02 djm Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.189 djm 68: #include <sys/queue.h>
1.150 stevesk 69:
1.155 stevesk 70: #include <ctype.h>
1.168 stevesk 71: #include <errno.h>
1.151 stevesk 72: #include <paths.h>
1.374 djm 73: #include <poll.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>
1.328 deraadt 78: #include <stdarg.h>
1.150 stevesk 79: #include <termios.h>
1.175 deraadt 80: #include <pwd.h>
1.169 stevesk 81: #include <unistd.h>
1.266 deraadt 82: #include <limits.h>
1.1 deraadt 83:
1.175 deraadt 84: #include "xmalloc.h"
1.45 markus 85: #include "ssh.h"
86: #include "ssh2.h"
1.1 deraadt 87: #include "packet.h"
1.315 markus 88: #include "sshbuf.h"
1.15 markus 89: #include "compat.h"
1.74 markus 90: #include "channels.h"
1.15 markus 91: #include "dispatch.h"
1.317 markus 92: #include "sshkey.h"
1.175 deraadt 93: #include "cipher.h"
1.54 markus 94: #include "kex.h"
1.275 markus 95: #include "myproposal.h"
1.45 markus 96: #include "log.h"
1.261 millert 97: #include "misc.h"
1.45 markus 98: #include "readconf.h"
99: #include "clientloop.h"
1.147 djm 100: #include "sshconnect.h"
1.40 markus 101: #include "authfd.h"
1.45 markus 102: #include "atomicio.h"
1.118 deraadt 103: #include "sshpty.h"
1.123 djm 104: #include "match.h"
105: #include "msg.h"
1.262 djm 106: #include "ssherr.h"
1.267 djm 107: #include "hostfile.h"
1.319 djm 108:
1.375 djm 109: /* Permitted RSA signature algorithms for UpdateHostkeys proofs */
110: #define HOSTKEY_PROOF_RSA_ALGS "rsa-sha2-512,rsa-sha2-256"
111:
1.39 markus 112: /* import options */
113: extern Options options;
1.1 deraadt 114:
1.123 djm 115: /* Control socket */
1.217 djm 116: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 117:
1.13 markus 118: /*
119: * Name of the host we are connecting to. This is the name given on the
1.324 jmc 120: * command line, or the Hostname specified for the user-supplied name in a
1.13 markus 121: * configuration file.
122: */
1.1 deraadt 123: extern char *host;
124:
1.13 markus 125: /*
1.330 djm 126: * If this field is not NULL, the ForwardAgent socket is this path and different
127: * instead of SSH_AUTH_SOCK.
128: */
129: extern char *forward_agent_sock_path;
130:
131: /*
1.13 markus 132: * Flag to indicate that we have received a window change signal which has
133: * not yet been processed. This will cause a message indicating the new
134: * window size to be sent to the server a little later. This is volatile
135: * because this is updated in a signal handler.
136: */
1.88 markus 137: static volatile sig_atomic_t received_window_change_signal = 0;
138: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 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. */
1.11 markus 145: static int last_was_cr; /* Last character was a newline. */
1.197 djm 146: static int exit_status; /* Used to store the command exit status. */
1.315 markus 147: static struct sshbuf *stderr_buffer; /* Used for final exit message. */
1.11 markus 148: static int connection_in; /* Connection to server (input). */
149: static int connection_out; /* Connection to server (output). */
1.56 markus 150: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 151: static int session_closed; /* In SSH2: login session closed. */
1.388 dtucker 152: static time_t x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.345 dtucker 153: static time_t server_alive_time; /* Time to do server_alive_check */
1.384 djm 154: static int hostkeys_update_complete;
155: static int session_setup_complete;
1.1 deraadt 156:
1.321 djm 157: static void client_init_dispatch(struct ssh *ssh);
1.16 markus 158: int session_ident = -1;
159:
1.195 djm 160: /* Track escape per proto2 channel */
161: struct escape_filter_ctx {
162: int escape_pending;
163: int escape_char;
164: };
165:
166: /* Context for channel confirmation replies */
1.190 djm 167: struct channel_reply_ctx {
168: const char *request_type;
1.234 djm 169: int id;
170: enum confirm_action action;
1.190 djm 171: };
172:
1.196 djm 173: /* Global request success/failure callbacks */
1.303 djm 174: /* XXX move to struct ssh? */
1.196 djm 175: struct global_confirm {
176: TAILQ_ENTRY(global_confirm) entry;
177: global_confirm_cb *cb;
178: void *ctx;
179: int ref_count;
180: };
181: TAILQ_HEAD(global_confirms, global_confirm);
182: static struct global_confirms global_confirms =
183: TAILQ_HEAD_INITIALIZER(global_confirms);
184:
1.315 markus 185: void ssh_process_session2_setup(int, int, int, struct sshbuf *);
1.377 djm 186: static void quit_message(const char *fmt, ...)
187: __attribute__((__format__ (printf, 1, 2)));
188:
189: static void
190: quit_message(const char *fmt, ...)
191: {
192: char *msg;
193: va_list args;
194: int r;
195:
196: va_start(args, fmt);
197: xvasprintf(&msg, fmt, args);
198: va_end(args);
199:
200: if ((r = sshbuf_putf(stderr_buffer, "%s\r\n", msg)) != 0)
201: fatal_fr(r, "sshbuf_putf");
202: quit_pending = 1;
203: }
1.123 djm 204:
1.13 markus 205: /*
206: * Signal handler for the window change signal (SIGWINCH). This just sets a
207: * flag indicating that the window has changed.
208: */
1.77 itojun 209: static void
1.11 markus 210: window_change_handler(int sig)
1.1 deraadt 211: {
1.11 markus 212: received_window_change_signal = 1;
1.1 deraadt 213: }
214:
1.13 markus 215: /*
216: * Signal handler for signals that cause the program to terminate. These
217: * signals must be trapped to restore terminal modes.
218: */
1.77 itojun 219: static void
1.11 markus 220: signal_handler(int sig)
1.1 deraadt 221: {
1.75 markus 222: received_signal = sig;
223: quit_pending = 1;
1.1 deraadt 224: }
225:
1.13 markus 226: /*
1.222 djm 227: * Sets control_persist_exit_time to the absolute time when the
228: * backgrounded control master should exit due to expiry of the
229: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
230: * control master process, or if there is no ControlPersist timeout.
231: */
232: static void
1.303 djm 233: set_control_persist_exit_time(struct ssh *ssh)
1.222 djm 234: {
235: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 236: || options.control_persist_timeout == 0) {
1.222 djm 237: /* not using a ControlPersist timeout */
238: control_persist_exit_time = 0;
1.303 djm 239: } else if (channel_still_open(ssh)) {
1.222 djm 240: /* some client connections are still open */
241: if (control_persist_exit_time > 0)
1.354 djm 242: debug2_f("cancel scheduled exit");
1.222 djm 243: control_persist_exit_time = 0;
244: } else if (control_persist_exit_time <= 0) {
245: /* a client connection has recently closed */
1.251 dtucker 246: control_persist_exit_time = monotime() +
1.222 djm 247: (time_t)options.control_persist_timeout;
1.354 djm 248: debug2_f("schedule exit in %d seconds",
1.222 djm 249: options.control_persist_timeout);
250: }
251: /* else we are already counting down to the timeout */
252: }
253:
1.238 dtucker 254: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
255: static int
256: client_x11_display_valid(const char *display)
257: {
258: size_t i, dlen;
259:
1.279 djm 260: if (display == NULL)
261: return 0;
262:
1.238 dtucker 263: dlen = strlen(display);
264: for (i = 0; i < dlen; i++) {
1.256 deraadt 265: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 266: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
267: debug("Invalid character '%c' in DISPLAY", display[i]);
268: return 0;
269: }
270: }
271: return 1;
272: }
273:
1.274 djm 274: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
275: #define X11_TIMEOUT_SLACK 60
1.279 djm 276: int
1.303 djm 277: client_x11_get_proto(struct ssh *ssh, const char *display,
278: const char *xauth_path, u_int trusted, u_int timeout,
279: char **_proto, char **_data)
1.138 djm 280: {
1.318 djm 281: char *cmd, line[512], xdisplay[512];
1.279 djm 282: char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
1.138 djm 283: static char proto[512], data[512];
284: FILE *f;
1.288 tedu 285: int got_data = 0, generated = 0, do_unlink = 0, r;
1.138 djm 286: struct stat st;
1.274 djm 287: u_int now, x11_timeout_real;
1.138 djm 288:
289: *_proto = proto;
290: *_data = data;
1.279 djm 291: proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
1.138 djm 292:
1.279 djm 293: if (!client_x11_display_valid(display)) {
1.283 millert 294: if (display != NULL)
295: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
296: display);
1.279 djm 297: return -1;
298: }
299: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
1.138 djm 300: debug("No xauth program.");
1.279 djm 301: xauth_path = NULL;
302: }
303:
304: if (xauth_path != NULL) {
1.138 djm 305: /*
306: * Handle FamilyLocal case where $DISPLAY does
307: * not match an authorization entry. For this we
308: * just try "xauth list unix:displaynum.screennum".
309: * XXX: "localhost" match to determine FamilyLocal
310: * is not perfect.
311: */
312: if (strncmp(display, "localhost:", 10) == 0) {
1.279 djm 313: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
314: display + 10)) < 0 ||
315: (size_t)r >= sizeof(xdisplay)) {
1.354 djm 316: error_f("display name too long");
1.279 djm 317: return -1;
318: }
1.138 djm 319: display = xdisplay;
320: }
321: if (trusted == 0) {
1.274 djm 322: /*
1.279 djm 323: * Generate an untrusted X11 auth cookie.
324: *
1.274 djm 325: * The authentication cookie should briefly outlive
326: * ssh's willingness to forward X11 connections to
327: * avoid nasty fail-open behaviour in the X server.
328: */
1.279 djm 329: mktemp_proto(xauthdir, sizeof(xauthdir));
330: if (mkdtemp(xauthdir) == NULL) {
1.354 djm 331: error_f("mkdtemp: %s", strerror(errno));
1.279 djm 332: return -1;
333: }
334: do_unlink = 1;
335: if ((r = snprintf(xauthfile, sizeof(xauthfile),
336: "%s/xauthfile", xauthdir)) < 0 ||
337: (size_t)r >= sizeof(xauthfile)) {
1.354 djm 338: error_f("xauthfile path too long");
1.279 djm 339: rmdir(xauthdir);
340: return -1;
341: }
342:
1.318 djm 343: if (timeout == 0) {
344: /* auth doesn't time out */
345: xasprintf(&cmd, "%s -f %s generate %s %s "
346: "untrusted 2>%s",
347: xauth_path, xauthfile, display,
348: SSH_X11_PROTO, _PATH_DEVNULL);
349: } else {
350: /* Add some slack to requested expiry */
351: if (timeout < UINT_MAX - X11_TIMEOUT_SLACK)
352: x11_timeout_real = timeout +
353: X11_TIMEOUT_SLACK;
354: else {
355: /* Don't overflow on long timeouts */
356: x11_timeout_real = UINT_MAX;
357: }
358: xasprintf(&cmd, "%s -f %s generate %s %s "
359: "untrusted timeout %u 2>%s",
360: xauth_path, xauthfile, display,
361: SSH_X11_PROTO, x11_timeout_real,
362: _PATH_DEVNULL);
363: }
1.354 djm 364: debug2_f("xauth command: %s", cmd);
1.318 djm 365:
366: if (timeout != 0 && x11_refuse_time == 0) {
1.279 djm 367: now = monotime() + 1;
1.388 dtucker 368: if (SSH_TIME_T_MAX - timeout < now)
369: x11_refuse_time = SSH_TIME_T_MAX;
1.279 djm 370: else
371: x11_refuse_time = now + timeout;
1.303 djm 372: channel_set_x11_refuse_time(ssh,
373: x11_refuse_time);
1.138 djm 374: }
1.279 djm 375: if (system(cmd) == 0)
376: generated = 1;
1.318 djm 377: free(cmd);
1.138 djm 378: }
1.181 markus 379:
380: /*
381: * When in untrusted mode, we read the cookie only if it was
382: * successfully generated as an untrusted one in the step
383: * above.
384: */
385: if (trusted || generated) {
1.318 djm 386: xasprintf(&cmd,
1.181 markus 387: "%s %s%s list %s 2>" _PATH_DEVNULL,
388: xauth_path,
389: generated ? "-f " : "" ,
390: generated ? xauthfile : "",
391: display);
392: debug2("x11_get_proto: %s", cmd);
393: f = popen(cmd, "r");
394: if (f && fgets(line, sizeof(line), f) &&
395: sscanf(line, "%*s %511s %511s", proto, data) == 2)
396: got_data = 1;
397: if (f)
398: pclose(f);
1.318 djm 399: free(cmd);
1.279 djm 400: }
1.138 djm 401: }
402:
403: if (do_unlink) {
404: unlink(xauthfile);
405: rmdir(xauthdir);
406: }
407:
1.279 djm 408: /* Don't fall back to fake X11 data for untrusted forwarding */
409: if (!trusted && !got_data) {
410: error("Warning: untrusted X11 forwarding setup failed: "
411: "xauth key data not generated");
412: return -1;
413: }
414:
1.138 djm 415: /*
416: * If we didn't get authentication data, just make up some
417: * data. The forwarding code will check the validity of the
418: * response anyway, and substitute this data. The X11
419: * server, however, will ignore this fake data and use
420: * whatever authentication mechanisms it was using otherwise
421: * for the local connection.
422: */
423: if (!got_data) {
1.288 tedu 424: u_int8_t rnd[16];
425: u_int i;
1.138 djm 426:
427: logit("Warning: No xauth data; "
428: "using fake authentication data for X11 forwarding.");
429: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.288 tedu 430: arc4random_buf(rnd, sizeof(rnd));
431: for (i = 0; i < sizeof(rnd); i++) {
1.138 djm 432: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.288 tedu 433: rnd[i]);
1.138 djm 434: }
435: }
1.279 djm 436:
437: return 0;
1.1 deraadt 438: }
439:
1.13 markus 440: /*
441: * Checks if the client window has changed, and sends a packet about it to
442: * the server if so. The actual change is detected elsewhere (by a software
443: * interrupt on Unix); this just checks the flag and sends a message if
444: * appropriate.
445: */
1.1 deraadt 446:
1.77 itojun 447: static void
1.303 djm 448: client_check_window_change(struct ssh *ssh)
1.1 deraadt 449: {
1.292 djm 450: if (!received_window_change_signal)
1.16 markus 451: return;
452: received_window_change_signal = 0;
1.354 djm 453: debug2_f("changed");
1.303 djm 454: channel_send_window_changes(ssh);
1.1 deraadt 455: }
456:
1.264 markus 457: static int
1.297 markus 458: client_global_request_reply(int type, u_int32_t seq, struct ssh *ssh)
1.117 markus 459: {
1.196 djm 460: struct global_confirm *gc;
461:
462: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 463: return 0;
1.196 djm 464: if (gc->cb != NULL)
1.303 djm 465: gc->cb(ssh, type, seq, gc->ctx);
1.196 djm 466: if (--gc->ref_count <= 0) {
467: TAILQ_REMOVE(&global_confirms, gc, entry);
1.342 jsg 468: freezero(gc, sizeof(*gc));
1.196 djm 469: }
470:
1.320 djm 471: ssh_packet_set_alive_timeouts(ssh, 0);
1.264 markus 472: return 0;
1.117 markus 473: }
474:
475: static void
1.345 dtucker 476: schedule_server_alive_check(void)
477: {
478: if (options.server_alive_interval > 0)
479: server_alive_time = monotime() + options.server_alive_interval;
480: }
481:
482: static void
1.320 djm 483: server_alive_check(struct ssh *ssh)
1.117 markus 484: {
1.320 djm 485: int r;
486:
487: if (ssh_packet_inc_alive_timeouts(ssh) > options.server_alive_count_max) {
1.228 djm 488: logit("Timeout, server %s not responding.", host);
1.176 markus 489: cleanup_exit(255);
490: }
1.320 djm 491: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
492: (r = sshpkt_put_cstring(ssh, "keepalive@openssh.com")) != 0 ||
493: (r = sshpkt_put_u8(ssh, 1)) != 0 || /* boolean: want reply */
494: (r = sshpkt_send(ssh)) != 0)
1.354 djm 495: fatal_fr(r, "send packet");
1.196 djm 496: /* Insert an empty placeholder to maintain ordering */
497: client_register_global_confirm(NULL, NULL);
1.345 dtucker 498: schedule_server_alive_check();
1.117 markus 499: }
500:
1.393 djm 501: /* Try to send a dummy keystroke */
502: static int
503: send_chaff(struct ssh *ssh)
504: {
505: int r;
506:
507: if ((ssh->kex->flags & KEX_HAS_PING) == 0)
508: return 0;
509: /* XXX probabilistically send chaff? */
510: /*
511: * a SSH2_MSG_CHANNEL_DATA payload is 9 bytes:
512: * 4 bytes channel ID + 4 bytes string length + 1 byte string data
513: * simulate that here.
514: */
515: if ((r = sshpkt_start(ssh, SSH2_MSG_PING)) != 0 ||
516: (r = sshpkt_put_cstring(ssh, "PING!")) != 0 ||
517: (r = sshpkt_send(ssh)) != 0)
518: fatal_fr(r, "send packet");
519: return 1;
520: }
521:
522: /*
523: * Performs keystroke timing obfuscation. Returns non-zero if the
524: * output fd should be polled.
525: */
526: static int
1.396 ! djm 527: obfuscate_keystroke_timing(struct ssh *ssh, struct timespec *timeout,
! 528: int channel_did_enqueue)
1.393 djm 529: {
530: static int active;
531: static struct timespec next_interval, chaff_until;
532: struct timespec now, tmp;
533: int just_started = 0, had_keystroke = 0;
534: static unsigned long long nchaff;
535: char *stop_reason = NULL;
536: long long n;
537:
538: monotime_ts(&now);
539:
540: if (options.obscure_keystroke_timing_interval <= 0)
541: return 1; /* disabled in config */
542:
543: if (!channel_still_open(ssh) || quit_pending) {
544: /* Stop if no channels left of we're waiting for one to close */
545: stop_reason = "no active channels";
546: } else if (ssh_packet_is_rekeying(ssh)) {
547: /* Stop if we're rekeying */
548: stop_reason = "rekeying started";
549: } else if (!ssh_packet_interactive_data_to_write(ssh) &&
550: ssh_packet_have_data_to_write(ssh)) {
551: /* Stop if the output buffer has more than a few keystrokes */
552: stop_reason = "output buffer filling";
1.396 ! djm 553: } else if (active && channel_did_enqueue &&
! 554: ssh_packet_have_data_to_write(ssh)) {
1.393 djm 555: /* Still in active mode and have a keystroke queued. */
556: had_keystroke = 1;
557: } else if (active) {
558: if (timespeccmp(&now, &chaff_until, >=)) {
559: /* Stop if there have been no keystrokes for a while */
560: stop_reason = "chaff time expired";
561: } else if (timespeccmp(&now, &next_interval, >=)) {
562: /* Otherwise if we were due to send, then send chaff */
563: if (send_chaff(ssh))
564: nchaff++;
565: }
566: }
567:
568: if (stop_reason != NULL) {
1.395 djm 569: if (active) {
570: debug3_f("stopping: %s (%llu chaff packets sent)",
571: stop_reason, nchaff);
572: active = 0;
573: }
1.393 djm 574: return 1;
575: }
576:
577: /*
578: * If we're in interactive mode, and only have a small amount
579: * of outbound data, then we assume that the user is typing
580: * interactively. In this case, start quantising outbound packets to
581: * fixed time intervals to hide inter-keystroke timing.
582: */
1.396 ! djm 583: if (!active && ssh_packet_interactive_data_to_write(ssh) &&
! 584: channel_did_enqueue && ssh_packet_have_data_to_write(ssh)) {
1.393 djm 585: debug3_f("starting: interval %d",
586: options.obscure_keystroke_timing_interval);
587: just_started = had_keystroke = active = 1;
588: nchaff = 0;
589: ms_to_timespec(&tmp, options.obscure_keystroke_timing_interval);
590: timespecadd(&now, &tmp, &next_interval);
591: }
592:
593: /* Don't hold off if obfuscation inactive */
594: if (!active)
595: return 1;
596:
597: if (had_keystroke) {
598: /*
599: * Arrange to send chaff packets for a random interval after
600: * the last keystroke was sent.
601: */
602: ms_to_timespec(&tmp, SSH_KEYSTROKE_CHAFF_MIN_MS +
603: arc4random_uniform(SSH_KEYSTROKE_CHAFF_RNG_MS));
604: timespecadd(&now, &tmp, &chaff_until);
605: }
606:
607: ptimeout_deadline_monotime_tsp(timeout, &next_interval);
608:
609: if (just_started)
610: return 1;
611:
612: /* Don't arm output fd for poll until the timing interval has elapsed */
613: if (timespeccmp(&now, &next_interval, <))
614: return 0;
615:
616: /* Calculate number of intervals missed since the last check */
1.394 djm 617: n = (now.tv_sec - next_interval.tv_sec) * 1000LL * 1000 * 1000;
1.393 djm 618: n += now.tv_nsec - next_interval.tv_nsec;
1.394 djm 619: n /= options.obscure_keystroke_timing_interval * 1000LL * 1000;
1.393 djm 620: n = (n < 0) ? 1 : n + 1;
621:
622: /* Advance to the next interval */
623: ms_to_timespec(&tmp, options.obscure_keystroke_timing_interval * n);
624: timespecadd(&now, &tmp, &next_interval);
625: return 1;
626: }
627:
1.13 markus 628: /*
629: * Waits until the client can do something (some data becomes available on
630: * one of the file descriptors).
631: */
1.77 itojun 632: static void
1.374 djm 633: client_wait_until_can_do_something(struct ssh *ssh, struct pollfd **pfdp,
1.396 ! djm 634: u_int *npfd_allocp, u_int *npfd_activep, int channel_did_enqueue,
1.374 djm 635: int *conn_in_readyp, int *conn_out_readyp)
1.11 markus 636: {
1.386 djm 637: struct timespec timeout;
1.393 djm 638: int ret, oready;
1.374 djm 639: u_int p;
1.117 markus 640:
1.374 djm 641: *conn_in_readyp = *conn_out_readyp = 0;
1.11 markus 642:
1.374 djm 643: /* Prepare channel poll. First two pollfd entries are reserved */
1.386 djm 644: ptimeout_init(&timeout);
645: channel_prepare_poll(ssh, pfdp, npfd_allocp, npfd_activep, 2, &timeout);
1.374 djm 646: if (*npfd_activep < 2)
647: fatal_f("bad npfd %u", *npfd_activep); /* shouldn't happen */
648:
649: /* channel_prepare_poll could have closed the last channel */
1.303 djm 650: if (session_closed && !channel_still_open(ssh) &&
1.320 djm 651: !ssh_packet_have_data_to_write(ssh)) {
1.374 djm 652: /* clear events since we did not call poll() */
653: for (p = 0; p < *npfd_activep; p++)
654: (*pfdp)[p].revents = 0;
1.292 djm 655: return;
1.16 markus 656: }
1.11 markus 657:
1.396 ! djm 658: oready = obfuscate_keystroke_timing(ssh, &timeout, channel_did_enqueue);
1.393 djm 659:
1.374 djm 660: /* Monitor server connection on reserved pollfd entries */
661: (*pfdp)[0].fd = connection_in;
662: (*pfdp)[0].events = POLLIN;
663: (*pfdp)[1].fd = connection_out;
1.393 djm 664: (*pfdp)[1].events = (oready && ssh_packet_have_data_to_write(ssh)) ?
665: POLLOUT : 0;
1.11 markus 666:
1.13 markus 667: /*
668: * Wait for something to happen. This will suspend the process until
1.374 djm 669: * some polled descriptor can be read, written, or has some other
1.222 djm 670: * event pending, or a timeout expires.
1.13 markus 671: */
1.386 djm 672: set_control_persist_exit_time(ssh);
673: if (control_persist_exit_time > 0)
674: ptimeout_deadline_monotime(&timeout, control_persist_exit_time);
1.345 dtucker 675: if (options.server_alive_interval > 0)
1.386 djm 676: ptimeout_deadline_monotime(&timeout, server_alive_time);
1.396 ! djm 677: if (options.rekey_interval > 0 && !ssh_packet_is_rekeying(ssh)) {
1.386 djm 678: ptimeout_deadline_sec(&timeout,
1.320 djm 679: ssh_packet_get_rekey_timeout(ssh));
1.386 djm 680: }
1.374 djm 681:
1.393 djm 682: ret = ppoll(*pfdp, *npfd_activep, ptimeout_get_tsp(&timeout), NULL);
1.222 djm 683:
1.326 deraadt 684: if (ret == -1) {
1.51 markus 685: /*
1.374 djm 686: * We have to clear the events because we return.
1.51 markus 687: * We have to return, because the mainloop checks for the flags
688: * set by the signal handlers.
689: */
1.374 djm 690: for (p = 0; p < *npfd_activep; p++)
691: (*pfdp)[p].revents = 0;
1.11 markus 692: if (errno == EINTR)
693: return;
694: /* Note: we might still have data in the buffers. */
1.377 djm 695: quit_message("poll: %s", strerror(errno));
1.374 djm 696: return;
697: }
698:
699: *conn_in_readyp = (*pfdp)[0].revents != 0;
700: *conn_out_readyp = (*pfdp)[1].revents != 0;
701:
702: if (options.server_alive_interval > 0 && !*conn_in_readyp &&
703: monotime() >= server_alive_time) {
1.249 dtucker 704: /*
1.374 djm 705: * ServerAlive check is needed. We can't rely on the poll
1.345 dtucker 706: * timing out since traffic on the client side such as port
707: * forwards can keep waking it up.
1.249 dtucker 708: */
1.345 dtucker 709: server_alive_check(ssh);
1.374 djm 710: }
1.11 markus 711: }
712:
1.77 itojun 713: static void
1.315 markus 714: client_suspend_self(struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr)
1.1 deraadt 715: {
1.11 markus 716: /* Flush stdout and stderr buffers. */
1.315 markus 717: if (sshbuf_len(bout) > 0)
718: atomicio(vwrite, fileno(stdout), sshbuf_mutable_ptr(bout),
719: sshbuf_len(bout));
720: if (sshbuf_len(berr) > 0)
721: atomicio(vwrite, fileno(stderr), sshbuf_mutable_ptr(berr),
722: sshbuf_len(berr));
1.11 markus 723:
1.233 djm 724: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 725:
1.305 djm 726: sshbuf_reset(bin);
727: sshbuf_reset(bout);
728: sshbuf_reset(berr);
1.11 markus 729:
730: /* Send the suspend signal to the program itself. */
731: kill(getpid(), SIGTSTP);
732:
1.132 djm 733: /* Reset window sizes in case they have changed */
734: received_window_change_signal = 1;
1.11 markus 735:
1.233 djm 736: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 737: }
738:
1.77 itojun 739: static void
1.374 djm 740: client_process_net_input(struct ssh *ssh)
1.11 markus 741: {
1.378 djm 742: int r;
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: */
1.374 djm 748: schedule_server_alive_check();
1.378 djm 749: if ((r = ssh_packet_process_read(ssh, connection_in)) == 0)
750: return; /* success */
751: if (r == SSH_ERR_SYSTEM_ERROR) {
752: if (errno == EAGAIN || errno == EINTR)
753: return;
754: if (errno == EPIPE) {
755: quit_message("Connection to %s closed by remote host.",
756: host);
757: return;
758: }
1.11 markus 759: }
1.378 djm 760: quit_message("Read from remote host %s: %s", host, ssh_err(r));
1.17 markus 761: }
1.16 markus 762:
1.97 jakob 763: static void
1.303 djm 764: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 765: {
1.190 djm 766: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
767: char errmsg[256];
1.315 markus 768: int r, tochan;
1.190 djm 769:
1.234 djm 770: /*
771: * If a TTY was explicitly requested, then a failure to allocate
772: * one is fatal.
773: */
774: if (cr->action == CONFIRM_TTY &&
775: (options.request_tty == REQUEST_TTY_FORCE ||
776: options.request_tty == REQUEST_TTY_YES))
777: cr->action = CONFIRM_CLOSE;
778:
1.312 djm 779: /* XXX suppress on mux _client_ quietmode */
1.190 djm 780: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 781: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 782:
783: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
784: debug2("%s request accepted on channel %d",
785: cr->request_type, c->self);
786: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
787: if (tochan) {
788: snprintf(errmsg, sizeof(errmsg),
789: "%s request failed\r\n", cr->request_type);
790: } else {
791: snprintf(errmsg, sizeof(errmsg),
792: "%s request failed on channel %d",
793: cr->request_type, c->self);
794: }
795: /* If error occurred on primary session channel, then exit */
1.234 djm 796: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 797: fatal("%s", errmsg);
1.234 djm 798: /*
799: * If error occurred on mux client, append to
800: * their stderr.
801: */
802: if (tochan) {
1.360 djm 803: debug3_f("channel %d: mux request: %s", c->self,
804: cr->request_type);
1.315 markus 805: if ((r = sshbuf_put(c->extended, errmsg,
806: strlen(errmsg))) != 0)
1.354 djm 807: fatal_fr(r, "sshbuf_put");
1.234 djm 808: } else
1.190 djm 809: error("%s", errmsg);
1.234 djm 810: if (cr->action == CONFIRM_TTY) {
811: /*
812: * If a TTY allocation error occurred, then arrange
813: * for the correct TTY to leave raw mode.
814: */
815: if (c->self == session_ident)
816: leave_raw_mode(0);
817: else
1.303 djm 818: mux_tty_alloc_failed(ssh, c);
1.234 djm 819: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 820: chan_read_failed(ssh, c);
821: chan_write_failed(ssh, c);
1.190 djm 822: }
823: }
1.250 djm 824: free(cr);
1.190 djm 825: }
826:
827: static void
1.303 djm 828: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 829: {
1.250 djm 830: free(ctx);
1.190 djm 831: }
1.129 deraadt 832:
1.236 djm 833: void
1.303 djm 834: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 835: enum confirm_action action)
1.190 djm 836: {
1.255 djm 837: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 838:
1.190 djm 839: cr->request_type = request;
1.234 djm 840: cr->action = action;
1.123 djm 841:
1.303 djm 842: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 843: client_abandon_status_confirm, cr);
1.196 djm 844: }
845:
846: void
847: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
848: {
1.201 djm 849: struct global_confirm *gc, *last_gc;
1.196 djm 850:
851: /* Coalesce identical callbacks */
1.201 djm 852: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
853: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
854: if (++last_gc->ref_count >= INT_MAX)
1.354 djm 855: fatal_f("last_gc->ref_count = %d",
856: last_gc->ref_count);
1.196 djm 857: return;
858: }
859:
1.255 djm 860: gc = xcalloc(1, sizeof(*gc));
1.196 djm 861: gc->cb = cb;
862: gc->ctx = ctx;
863: gc->ref_count = 1;
864: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 865: }
866:
1.384 djm 867: /*
868: * Returns non-zero if the client is able to handle a hostkeys-00@openssh.com
869: * hostkey update request.
870: */
871: static int
872: can_update_hostkeys(void)
873: {
874: if (hostkeys_update_complete)
875: return 0;
876: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
877: options.batch_mode)
878: return 0; /* won't ask in batchmode, so don't even try */
879: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
880: return 0;
881: return 1;
882: }
883:
1.385 dtucker 884: static void
885: client_repledge(void)
1.384 djm 886: {
887: debug3_f("enter");
888:
889: /* Might be able to tighten pledge now that session is established */
890: if (options.control_master || options.control_path != NULL ||
891: options.forward_x11 || options.fork_after_authentication ||
892: can_update_hostkeys() ||
893: (session_ident != -1 && !session_setup_complete)) {
894: /* Can't tighten */
895: return;
896: }
897: /*
898: * LocalCommand and UpdateHostkeys have finished, so can get rid of
899: * filesystem.
900: *
901: * XXX protocol allows a server can to change hostkeys during the
902: * connection at rekey time that could trigger a hostkeys update
903: * but AFAIK no implementations support this. Could improve by
904: * forcing known_hosts to be read-only or via unveil(2).
905: */
906: if (options.num_local_forwards != 0 ||
907: options.num_remote_forwards != 0 ||
908: options.num_permitted_remote_opens != 0 ||
909: options.enable_escape_commandline != 0) {
910: /* rfwd needs inet */
911: debug("pledge: network");
912: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
913: fatal_f("pledge(): %s", strerror(errno));
914: } else if (options.forward_agent != 0) {
915: /* agent forwarding needs to open $SSH_AUTH_SOCK at will */
916: debug("pledge: agent");
917: if (pledge("stdio unix proc tty", NULL) == -1)
918: fatal_f("pledge(): %s", strerror(errno));
919: } else {
920: debug("pledge: fork");
921: if (pledge("stdio proc tty", NULL) == -1)
922: fatal_f("pledge(): %s", strerror(errno));
923: }
924: /* XXX further things to do:
925: *
926: * - might be able to get rid of proc if we kill ~^Z
927: * - ssh -N (no session)
928: * - stdio forwarding
929: * - sessions without tty
930: */
931: }
932:
1.123 djm 933: static void
1.303 djm 934: process_cmdline(struct ssh *ssh)
1.97 jakob 935: {
936: void (*handler)(int);
1.261 millert 937: char *s, *cmd;
938: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
939: struct Forward fwd;
1.97 jakob 940:
1.257 tedu 941: memset(&fwd, 0, sizeof(fwd));
1.183 djm 942:
1.233 djm 943: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.332 dtucker 944: handler = ssh_signal(SIGINT, SIG_IGN);
1.99 markus 945: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 946: if (s == NULL)
947: goto out;
1.256 deraadt 948: while (isspace((u_char)*s))
1.97 jakob 949: s++;
1.121 djm 950: if (*s == '-')
951: s++; /* Skip cmdline '-', if any */
1.120 dtucker 952: if (*s == '\0')
1.97 jakob 953: goto out;
1.121 djm 954:
1.122 djm 955: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 956: logit("Commands:");
1.164 djm 957: logit(" -L[bind_address:]port:host:hostport "
958: "Request local forward");
959: logit(" -R[bind_address:]port:host:hostport "
960: "Request remote forward");
1.204 stevesk 961: logit(" -D[bind_address:]port "
962: "Request dynamic forward");
1.237 markus 963: logit(" -KL[bind_address:]port "
964: "Cancel local forward");
1.165 stevesk 965: logit(" -KR[bind_address:]port "
1.164 djm 966: "Cancel remote forward");
1.237 markus 967: logit(" -KD[bind_address:]port "
968: "Cancel dynamic forward");
1.146 reyk 969: if (!options.permit_local_command)
970: goto out;
1.164 djm 971: logit(" !args "
972: "Execute local command");
1.146 reyk 973: goto out;
974: }
975:
976: if (*s == '!' && options.permit_local_command) {
977: s++;
978: ssh_local_cmd(s);
1.121 djm 979: goto out;
980: }
981:
982: if (*s == 'K') {
983: delete = 1;
984: s++;
985: }
1.204 stevesk 986: if (*s == 'L')
987: local = 1;
988: else if (*s == 'R')
989: remote = 1;
990: else if (*s == 'D')
991: dynamic = 1;
992: else {
1.109 itojun 993: logit("Invalid command.");
1.97 jakob 994: goto out;
995: }
1.204 stevesk 996:
1.256 deraadt 997: while (isspace((u_char)*++s))
1.179 tedu 998: ;
1.97 jakob 999:
1.217 djm 1000: /* XXX update list of forwards in options */
1.121 djm 1001: if (delete) {
1.261 millert 1002: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
1003: if (!parse_forward(&fwd, s, 1, 0)) {
1004: logit("Bad forwarding close specification.");
1.121 djm 1005: goto out;
1006: }
1.237 markus 1007: if (remote)
1.303 djm 1008: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 1009: else if (dynamic)
1.303 djm 1010: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 1011: 0, &options.fwd_opts) > 0;
1.237 markus 1012: else
1.303 djm 1013: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 1014: CHANNEL_CANCEL_PORT_STATIC,
1015: &options.fwd_opts) > 0;
1.237 markus 1016: if (!ok) {
1.290 dtucker 1017: logit("Unknown port forwarding.");
1.237 markus 1018: goto out;
1019: }
1020: logit("Canceled forwarding.");
1.121 djm 1021: } else {
1.382 dtucker 1022: /* -R specs can be both dynamic or not, so check both. */
1023: if (remote) {
1024: if (!parse_forward(&fwd, s, 0, remote) &&
1025: !parse_forward(&fwd, s, 1, remote)) {
1026: logit("Bad remote forwarding specification.");
1027: goto out;
1028: }
1029: } else if (!parse_forward(&fwd, s, dynamic, remote)) {
1030: logit("Bad local forwarding specification.");
1.121 djm 1031: goto out;
1032: }
1.204 stevesk 1033: if (local || dynamic) {
1.303 djm 1034: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 1035: &options.fwd_opts)) {
1.121 djm 1036: logit("Port forwarding failed.");
1037: goto out;
1038: }
1.135 djm 1039: } else {
1.303 djm 1040: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 1041: logit("Port forwarding failed.");
1042: goto out;
1043: }
1.135 djm 1044: }
1.121 djm 1045: logit("Forwarding port.");
1046: }
1047:
1.97 jakob 1048: out:
1.332 dtucker 1049: ssh_signal(SIGINT, handler);
1.233 djm 1050: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 1051: free(cmd);
1052: free(fwd.listen_host);
1.261 millert 1053: free(fwd.listen_path);
1.250 djm 1054: free(fwd.connect_host);
1.261 millert 1055: free(fwd.connect_path);
1.97 jakob 1056: }
1057:
1.244 dtucker 1058: /* reasons to suppress output of an escape command in help output */
1059: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 1060: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
1061: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
1062: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.383 djm 1063: #define SUPPRESS_NOCMDLINE 8 /* don't show when cmdline disabled*/
1.244 dtucker 1064: struct escape_help_text {
1065: const char *cmd;
1066: const char *text;
1067: unsigned int flags;
1068: };
1069: static struct escape_help_text esc_txt[] = {
1070: {".", "terminate session", SUPPRESS_MUXMASTER},
1071: {".", "terminate connection (and any multiplexed sessions)",
1072: SUPPRESS_MUXCLIENT},
1.292 djm 1073: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.383 djm 1074: {"C", "open a command line", SUPPRESS_MUXCLIENT|SUPPRESS_NOCMDLINE},
1.292 djm 1075: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 1076: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 1077: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
1078: {"#", "list forwarded connections", SUPPRESS_NEVER},
1079: {"&", "background ssh (when waiting for connections to terminate)",
1080: SUPPRESS_MUXCLIENT},
1081: {"?", "this message", SUPPRESS_NEVER},
1082: };
1083:
1084: static void
1.315 markus 1085: print_escape_help(struct sshbuf *b, int escape_char, int mux_client,
1086: int using_stderr)
1.244 dtucker 1087: {
1088: unsigned int i, suppress_flags;
1.315 markus 1089: int r;
1.244 dtucker 1090:
1.315 markus 1091: if ((r = sshbuf_putf(b,
1092: "%c?\r\nSupported escape sequences:\r\n", escape_char)) != 0)
1.354 djm 1093: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 1094:
1.292 djm 1095: suppress_flags =
1.244 dtucker 1096: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
1097: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
1.383 djm 1098: (using_stderr ? 0 : SUPPRESS_SYSLOG) |
1099: (options.enable_escape_commandline == 0 ? SUPPRESS_NOCMDLINE : 0);
1.244 dtucker 1100:
1101: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
1102: if (esc_txt[i].flags & suppress_flags)
1103: continue;
1.315 markus 1104: if ((r = sshbuf_putf(b, " %c%-3s - %s\r\n",
1105: escape_char, esc_txt[i].cmd, esc_txt[i].text)) != 0)
1.354 djm 1106: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 1107: }
1108:
1.315 markus 1109: if ((r = sshbuf_putf(b,
1.246 dtucker 1110: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 1111: "(Note that escapes are only recognized immediately after "
1.315 markus 1112: "newline.)\r\n", escape_char, escape_char)) != 0)
1.354 djm 1113: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 1114: }
1115:
1.314 djm 1116: /*
1.296 naddy 1117: * Process the characters one by one.
1.195 djm 1118: */
1.77 itojun 1119: static int
1.303 djm 1120: process_escapes(struct ssh *ssh, Channel *c,
1.315 markus 1121: struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr,
1.195 djm 1122: char *buf, int len)
1.31 markus 1123: {
1124: pid_t pid;
1.315 markus 1125: int r, bytes = 0;
1.42 markus 1126: u_int i;
1127: u_char ch;
1.31 markus 1128: char *s;
1.392 dtucker 1129: struct escape_filter_ctx *efc;
1.31 markus 1130:
1.392 dtucker 1131: if (c == NULL || c->filter_ctx == NULL || len <= 0)
1.294 djm 1132: return 0;
1.314 djm 1133:
1.392 dtucker 1134: efc = (struct escape_filter_ctx *)c->filter_ctx;
1.139 djm 1135:
1136: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1137: /* Get one character at a time. */
1138: ch = buf[i];
1139:
1.294 djm 1140: if (efc->escape_pending) {
1.31 markus 1141: /* We have previously seen an escape character. */
1142: /* Clear the flag now. */
1.294 djm 1143: efc->escape_pending = 0;
1.31 markus 1144:
1145: /* Process the escaped character. */
1146: switch (ch) {
1147: case '.':
1148: /* Terminate the connection. */
1.315 markus 1149: if ((r = sshbuf_putf(berr, "%c.\r\n",
1150: efc->escape_char)) != 0)
1.354 djm 1151: fatal_fr(r, "sshbuf_putf");
1.217 djm 1152: if (c && c->ctl_chan != -1) {
1.387 djm 1153: channel_force_close(ssh, c, 1);
1.195 djm 1154: return 0;
1155: } else
1156: quit_pending = 1;
1.31 markus 1157: return -1;
1158:
1159: case 'Z' - 64:
1.195 djm 1160: /* XXX support this for mux clients */
1.217 djm 1161: if (c && c->ctl_chan != -1) {
1.245 dtucker 1162: char b[16];
1.195 djm 1163: noescape:
1.245 dtucker 1164: if (ch == 'Z' - 64)
1165: snprintf(b, sizeof b, "^Z");
1166: else
1167: snprintf(b, sizeof b, "%c", ch);
1.315 markus 1168: if ((r = sshbuf_putf(berr,
1.245 dtucker 1169: "%c%s escape not available to "
1.195 djm 1170: "multiplexed sessions\r\n",
1.315 markus 1171: efc->escape_char, b)) != 0)
1.354 djm 1172: fatal_fr(r, "sshbuf_putf");
1.195 djm 1173: continue;
1174: }
1.197 djm 1175: /* Suspend the program. Inform the user */
1.315 markus 1176: if ((r = sshbuf_putf(berr,
1177: "%c^Z [suspend ssh]\r\n",
1178: efc->escape_char)) != 0)
1.354 djm 1179: fatal_fr(r, "sshbuf_putf");
1.31 markus 1180:
1181: /* Restore terminal modes and suspend. */
1182: client_suspend_self(bin, bout, berr);
1183:
1184: /* We have been continued. */
1185: continue;
1186:
1.111 markus 1187: case 'B':
1.315 markus 1188: if ((r = sshbuf_putf(berr,
1189: "%cB\r\n", efc->escape_char)) != 0)
1.354 djm 1190: fatal_fr(r, "sshbuf_putf");
1.303 djm 1191: channel_request_start(ssh, c->self, "break", 0);
1.315 markus 1192: if ((r = sshpkt_put_u32(ssh, 1000)) != 0 ||
1193: (r = sshpkt_send(ssh)) != 0)
1.354 djm 1194: fatal_fr(r, "send packet");
1.111 markus 1195: continue;
1196:
1.54 markus 1197: case 'R':
1.357 djm 1198: if (ssh->compat & SSH_BUG_NOREKEY)
1.292 djm 1199: logit("Server does not "
1200: "support re-keying");
1201: else
1202: need_rekeying = 1;
1.54 markus 1203: continue;
1204:
1.242 dtucker 1205: case 'V':
1206: /* FALLTHROUGH */
1207: case 'v':
1208: if (c && c->ctl_chan != -1)
1209: goto noescape;
1210: if (!log_is_on_stderr()) {
1.315 markus 1211: if ((r = sshbuf_putf(berr,
1.242 dtucker 1212: "%c%c [Logging to syslog]\r\n",
1.315 markus 1213: efc->escape_char, ch)) != 0)
1.354 djm 1214: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1215: continue;
1216: }
1217: if (ch == 'V' && options.log_level >
1218: SYSLOG_LEVEL_QUIET)
1219: log_change_level(--options.log_level);
1220: if (ch == 'v' && options.log_level <
1221: SYSLOG_LEVEL_DEBUG3)
1222: log_change_level(++options.log_level);
1.315 markus 1223: if ((r = sshbuf_putf(berr,
1.294 djm 1224: "%c%c [LogLevel %s]\r\n",
1225: efc->escape_char, ch,
1.315 markus 1226: log_level_name(options.log_level))) != 0)
1.354 djm 1227: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1228: continue;
1229:
1.31 markus 1230: case '&':
1.392 dtucker 1231: if (c->ctl_chan != -1)
1.195 djm 1232: goto noescape;
1.31 markus 1233: /*
1.197 djm 1234: * Detach the program (continue to serve
1235: * connections, but put in background and no
1236: * more new connections).
1.31 markus 1237: */
1238: /* Restore tty modes. */
1.233 djm 1239: leave_raw_mode(
1240: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1241:
1242: /* Stop listening for new connections. */
1.303 djm 1243: channel_stop_listening(ssh);
1.31 markus 1244:
1.354 djm 1245: if ((r = sshbuf_putf(berr, "%c& "
1246: "[backgrounded]\n", efc->escape_char)) != 0)
1247: fatal_fr(r, "sshbuf_putf");
1.31 markus 1248:
1249: /* Fork into background. */
1250: pid = fork();
1.326 deraadt 1251: if (pid == -1) {
1.31 markus 1252: error("fork: %.100s", strerror(errno));
1253: continue;
1254: }
1255: if (pid != 0) { /* This is the parent. */
1256: /* The parent just exits. */
1257: exit(0);
1258: }
1259: /* The child continues serving connections. */
1.292 djm 1260: /* fake EOF on stdin */
1.315 markus 1261: if ((r = sshbuf_put_u8(bin, 4)) != 0)
1.354 djm 1262: fatal_fr(r, "sshbuf_put_u8");
1.292 djm 1263: return -1;
1.31 markus 1264: case '?':
1.294 djm 1265: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1266: (c && c->ctl_chan != -1),
1267: log_is_on_stderr());
1.31 markus 1268: continue;
1269:
1270: case '#':
1.315 markus 1271: if ((r = sshbuf_putf(berr, "%c#\r\n",
1272: efc->escape_char)) != 0)
1.354 djm 1273: fatal_fr(r, "sshbuf_putf");
1.303 djm 1274: s = channel_open_message(ssh);
1.315 markus 1275: if ((r = sshbuf_put(berr, s, strlen(s))) != 0)
1.354 djm 1276: fatal_fr(r, "sshbuf_put");
1.250 djm 1277: free(s);
1.97 jakob 1278: continue;
1279:
1280: case 'C':
1.217 djm 1281: if (c && c->ctl_chan != -1)
1.206 djm 1282: goto noescape;
1.383 djm 1283: if (options.enable_escape_commandline == 0) {
1284: if ((r = sshbuf_putf(berr,
1285: "commandline disabled\r\n")) != 0)
1286: fatal_fr(r, "sshbuf_putf");
1287: continue;
1288: }
1.303 djm 1289: process_cmdline(ssh);
1.31 markus 1290: continue;
1291:
1292: default:
1.294 djm 1293: if (ch != efc->escape_char) {
1.315 markus 1294: if ((r = sshbuf_put_u8(bin,
1295: efc->escape_char)) != 0)
1.354 djm 1296: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1297: bytes++;
1298: }
1299: /* Escaped characters fall through here */
1300: break;
1301: }
1302: } else {
1303: /*
1.197 djm 1304: * The previous character was not an escape char.
1305: * Check if this is an escape.
1.31 markus 1306: */
1.294 djm 1307: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1308: /*
1309: * It is. Set the flag and continue to
1310: * next character.
1311: */
1.294 djm 1312: efc->escape_pending = 1;
1.31 markus 1313: continue;
1314: }
1315: }
1316:
1317: /*
1318: * Normal character. Record whether it was a newline,
1319: * and append it to the buffer.
1320: */
1321: last_was_cr = (ch == '\r' || ch == '\n');
1.315 markus 1322: if ((r = sshbuf_put_u8(bin, ch)) != 0)
1.354 djm 1323: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1324: bytes++;
1325: }
1326: return bytes;
1327: }
1328:
1.13 markus 1329: /*
1.15 markus 1330: * Get packets from the connection input buffer, and process them as long as
1331: * there are packets available.
1332: *
1333: * Any unknown packets received during the actual
1334: * session cause the session to terminate. This is
1335: * intended to make debugging easier since no
1336: * confirmations are sent. Any compatible protocol
1337: * extensions must be negotiated during the
1338: * preparatory phase.
1339: */
1340:
1.77 itojun 1341: static void
1.321 djm 1342: client_process_buffered_input_packets(struct ssh *ssh)
1.15 markus 1343: {
1.321 djm 1344: ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1345: }
1346:
1.31 markus 1347: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1348:
1.195 djm 1349: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1350: void *
1351: client_new_escape_filter_ctx(int escape_char)
1352: {
1353: struct escape_filter_ctx *ret;
1354:
1.255 djm 1355: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1356: ret->escape_pending = 0;
1357: ret->escape_char = escape_char;
1358: return (void *)ret;
1359: }
1360:
1.198 djm 1361: /* Free the escape filter context on channel free */
1362: void
1.303 djm 1363: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1364: {
1.250 djm 1365: free(ctx);
1.198 djm 1366: }
1367:
1.195 djm 1368: int
1.303 djm 1369: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1370: {
1.190 djm 1371: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1372: return 0;
1373:
1.303 djm 1374: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1375: buf, len);
1.30 markus 1376: }
1377:
1.77 itojun 1378: static void
1.387 djm 1379: client_channel_closed(struct ssh *ssh, int id, int force, void *arg)
1.60 markus 1380: {
1.303 djm 1381: channel_cancel_cleanup(ssh, id);
1.60 markus 1382: session_closed = 1;
1.233 djm 1383: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1384: }
1385:
1.15 markus 1386: /*
1.13 markus 1387: * Implements the interactive session with the server. This is called after
1388: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1389: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1390: * used as an escape character for terminating or suspending the session.
1.13 markus 1391: */
1.20 markus 1392: int
1.303 djm 1393: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1394: int ssh2_chan_id)
1.1 deraadt 1395: {
1.374 djm 1396: struct pollfd *pfd = NULL;
1397: u_int npfd_alloc = 0, npfd_active = 0;
1.11 markus 1398: double start_time, total_time;
1.396 ! djm 1399: int channel_did_enqueue = 0, r, len;
1.200 markus 1400: u_int64_t ibytes, obytes;
1.374 djm 1401: int conn_in_ready, conn_out_ready;
1.11 markus 1402:
1403: debug("Entering interactive session.");
1.384 djm 1404: session_ident = ssh2_chan_id;
1.277 semarie 1405:
1.278 semarie 1406: if (options.control_master &&
1.286 djm 1407: !option_clear_or_none(options.control_path)) {
1.278 semarie 1408: debug("pledge: id");
1.327 mestre 1409: if (pledge("stdio rpath wpath cpath unix inet dns recvfd sendfd proc exec id tty",
1.278 semarie 1410: NULL) == -1)
1.354 djm 1411: fatal_f("pledge(): %s", strerror(errno));
1.278 semarie 1412:
1413: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1414: debug("pledge: exec");
1415: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1416: NULL) == -1)
1.354 djm 1417: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1418:
1419: } else if (options.update_hostkeys) {
1.373 jsg 1420: debug("pledge: filesystem");
1.277 semarie 1421: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1422: NULL) == -1)
1.354 djm 1423: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1424:
1.286 djm 1425: } else if (!option_clear_or_none(options.proxy_command) ||
1.369 djm 1426: options.fork_after_authentication) {
1.277 semarie 1427: debug("pledge: proc");
1428: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1.354 djm 1429: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1430:
1431: } else {
1432: debug("pledge: network");
1.300 mestre 1433: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.354 djm 1434: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1435: }
1.11 markus 1436:
1.384 djm 1437: /* might be able to tighten now */
1438: client_repledge();
1439:
1.307 dtucker 1440: start_time = monotime_double();
1.11 markus 1441:
1442: /* Initialize variables. */
1443: last_was_cr = 1;
1444: exit_status = -1;
1.320 djm 1445: connection_in = ssh_packet_get_connection_in(ssh);
1446: connection_out = ssh_packet_get_connection_out(ssh);
1.46 markus 1447:
1.11 markus 1448: quit_pending = 0;
1449:
1.315 markus 1450: /* Initialize buffer. */
1451: if ((stderr_buffer = sshbuf_new()) == NULL)
1.354 djm 1452: fatal_f("sshbuf_new failed");
1.11 markus 1453:
1.321 djm 1454: client_init_dispatch(ssh);
1.15 markus 1455:
1.105 markus 1456: /*
1457: * Set signal handlers, (e.g. to restore non-blocking mode)
1458: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1459: */
1.332 dtucker 1460: if (ssh_signal(SIGHUP, SIG_IGN) != SIG_IGN)
1461: ssh_signal(SIGHUP, signal_handler);
1462: if (ssh_signal(SIGINT, SIG_IGN) != SIG_IGN)
1463: ssh_signal(SIGINT, signal_handler);
1464: if (ssh_signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1465: ssh_signal(SIGQUIT, signal_handler);
1466: if (ssh_signal(SIGTERM, SIG_IGN) != SIG_IGN)
1467: ssh_signal(SIGTERM, signal_handler);
1468: ssh_signal(SIGWINCH, window_change_handler);
1.11 markus 1469:
1470: if (have_pty)
1.233 djm 1471: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1472:
1.292 djm 1473: if (session_ident != -1) {
1474: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1475: channel_register_filter(ssh, session_ident,
1.292 djm 1476: client_simple_escape_filter, NULL,
1477: client_filter_cleanup,
1478: client_new_escape_filter_ctx(
1479: escape_char_arg));
1.232 djm 1480: }
1.303 djm 1481: channel_register_cleanup(ssh, session_ident,
1.292 djm 1482: client_channel_closed, 0);
1.48 markus 1483: }
1.345 dtucker 1484:
1485: schedule_server_alive_check();
1.30 markus 1486:
1.11 markus 1487: /* Main loop of the client for the interactive session mode. */
1488: while (!quit_pending) {
1.396 ! djm 1489: channel_did_enqueue = 0;
1.11 markus 1490:
1.13 markus 1491: /* Process buffered packets sent by the server. */
1.321 djm 1492: client_process_buffered_input_packets(ssh);
1.11 markus 1493:
1.303 djm 1494: if (session_closed && !channel_still_open(ssh))
1.60 markus 1495: break;
1496:
1.303 djm 1497: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1498: debug("rekeying in progress");
1.284 djm 1499: } else if (need_rekeying) {
1500: /* manual rekey request */
1501: debug("need rekeying");
1.303 djm 1502: if ((r = kex_start_rekex(ssh)) != 0)
1.354 djm 1503: fatal_fr(r, "kex_start_rekex");
1.284 djm 1504: need_rekeying = 0;
1.56 markus 1505: } else {
1506: /*
1507: * Make packets from buffered channel data, and
1508: * enqueue them for sending to the server.
1509: */
1.320 djm 1510: if (ssh_packet_not_very_much_data_to_write(ssh))
1.396 ! djm 1511: channel_did_enqueue = channel_output_poll(ssh);
1.11 markus 1512:
1.56 markus 1513: /*
1514: * Check if the window size has changed, and buffer a
1515: * message about it to the server if so.
1516: */
1.303 djm 1517: client_check_window_change(ssh);
1.11 markus 1518:
1.56 markus 1519: if (quit_pending)
1520: break;
1521: }
1.13 markus 1522: /*
1523: * Wait until we have something to do (something becomes
1524: * available on one of the descriptors).
1525: */
1.374 djm 1526: client_wait_until_can_do_something(ssh, &pfd, &npfd_alloc,
1.396 ! djm 1527: &npfd_active, channel_did_enqueue,
1.374 djm 1528: &conn_in_ready, &conn_out_ready);
1.11 markus 1529:
1530: if (quit_pending)
1531: break;
1532:
1.379 djm 1533: /* Do channel operations. */
1534: channel_after_poll(ssh, pfd, npfd_active);
1.11 markus 1535:
1.17 markus 1536: /* Buffer input from the connection. */
1.374 djm 1537: if (conn_in_ready)
1538: client_process_net_input(ssh);
1.17 markus 1539:
1540: if (quit_pending)
1541: break;
1.367 djm 1542:
1543: /* A timeout may have triggered rekeying */
1544: if ((r = ssh_packet_check_rekey(ssh)) != 0)
1545: fatal_fr(r, "cannot start rekeying");
1.11 markus 1546:
1.197 djm 1547: /*
1548: * Send as much buffered packet data as possible to the
1549: * sender.
1550: */
1.374 djm 1551: if (conn_out_ready) {
1.338 djm 1552: if ((r = ssh_packet_write_poll(ssh)) != 0) {
1553: sshpkt_fatal(ssh, r,
1554: "%s: ssh_packet_write_poll", __func__);
1555: }
1556: }
1.222 djm 1557:
1558: /*
1559: * If we are a backgrounded control master, and the
1560: * timeout has expired without any active client
1561: * connections, then quit.
1562: */
1563: if (control_persist_exit_time > 0) {
1.251 dtucker 1564: if (monotime() >= control_persist_exit_time) {
1.222 djm 1565: debug("ControlPersist timeout expired");
1566: break;
1567: }
1568: }
1.11 markus 1569: }
1.374 djm 1570: free(pfd);
1.11 markus 1571:
1572: /* Terminate the session. */
1573:
1574: /* Stop watching for window change. */
1.332 dtucker 1575: ssh_signal(SIGWINCH, SIG_DFL);
1.211 andreas 1576:
1.320 djm 1577: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
1578: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_BY_APPLICATION)) != 0 ||
1579: (r = sshpkt_put_cstring(ssh, "disconnected by user")) != 0 ||
1580: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language tag */
1581: (r = sshpkt_send(ssh)) != 0 ||
1582: (r = ssh_packet_write_wait(ssh)) != 0)
1.354 djm 1583: fatal_fr(r, "send disconnect");
1.11 markus 1584:
1.303 djm 1585: channel_free_all(ssh);
1.11 markus 1586:
1.75 markus 1587: if (have_pty)
1.233 djm 1588: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.116 dtucker 1589:
1590: /*
1591: * If there was no shell or command requested, there will be no remote
1592: * exit status to be returned. In that case, clear error code if the
1593: * connection was deliberately terminated at this end.
1594: */
1.370 djm 1595: if (options.session_type == SESSION_TYPE_NONE &&
1596: received_signal == SIGTERM) {
1.116 dtucker 1597: received_signal = 0;
1598: exit_status = 0;
1599: }
1.75 markus 1600:
1.301 dtucker 1601: if (received_signal) {
1602: verbose("Killed by signal %d.", (int) received_signal);
1.359 djm 1603: cleanup_exit(255);
1.301 dtucker 1604: }
1.75 markus 1605:
1.13 markus 1606: /*
1607: * In interactive mode (with pseudo tty) display a message indicating
1608: * that the connection has been closed.
1609: */
1.377 djm 1610: if (have_pty && options.log_level >= SYSLOG_LEVEL_INFO)
1611: quit_message("Connection to %s closed.", host);
1.70 markus 1612:
1.11 markus 1613: /* Output any buffered data for stderr. */
1.315 markus 1614: if (sshbuf_len(stderr_buffer) > 0) {
1.230 djm 1615: len = atomicio(vwrite, fileno(stderr),
1.315 markus 1616: (u_char *)sshbuf_ptr(stderr_buffer),
1617: sshbuf_len(stderr_buffer));
1618: if (len < 0 || (u_int)len != sshbuf_len(stderr_buffer))
1.11 markus 1619: error("Write failed flushing stderr buffer.");
1.315 markus 1620: else if ((r = sshbuf_consume(stderr_buffer, len)) != 0)
1.354 djm 1621: fatal_fr(r, "sshbuf_consume");
1.11 markus 1622: }
1623:
1624: /* Clear and free any buffers. */
1.315 markus 1625: sshbuf_free(stderr_buffer);
1.11 markus 1626:
1627: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1628: total_time = monotime_double() - start_time;
1.320 djm 1629: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.200 markus 1630: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1631: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1632: if (total_time > 0)
1.200 markus 1633: verbose("Bytes per second: sent %.1f, received %.1f",
1634: obytes / total_time, ibytes / total_time);
1.11 markus 1635: /* Return the exit status of the program. */
1636: debug("Exit status %d", exit_status);
1637: return exit_status;
1.15 markus 1638: }
1639:
1640: /*********/
1641:
1.77 itojun 1642: static Channel *
1.303 djm 1643: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1644: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1645: {
1.103 deraadt 1646: Channel *c = NULL;
1.289 markus 1647: struct sshbuf *b = NULL;
1.40 markus 1648: char *listen_address, *originator_address;
1.320 djm 1649: u_int listen_port, originator_port;
1.289 markus 1650: int r;
1.40 markus 1651:
1652: /* Get rest of the packet */
1.320 djm 1653: if ((r = sshpkt_get_cstring(ssh, &listen_address, NULL)) != 0 ||
1654: (r = sshpkt_get_u32(ssh, &listen_port)) != 0 ||
1655: (r = sshpkt_get_cstring(ssh, &originator_address, NULL)) != 0 ||
1656: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1657: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1658: fatal_fr(r, "parse packet");
1.40 markus 1659:
1.354 djm 1660: debug_f("listen %s port %d, originator %s port %d",
1.261 millert 1661: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1662:
1.320 djm 1663: if (listen_port > 0xffff)
1.354 djm 1664: error_f("invalid listen port");
1.320 djm 1665: else if (originator_port > 0xffff)
1.354 djm 1666: error_f("invalid originator port");
1.320 djm 1667: else {
1668: c = channel_connect_by_listen_address(ssh,
1669: listen_address, listen_port, "forwarded-tcpip",
1670: originator_address);
1671: }
1.40 markus 1672:
1.289 markus 1673: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1674: if ((b = sshbuf_new()) == NULL) {
1.354 djm 1675: error_f("alloc reply");
1.289 markus 1676: goto out;
1677: }
1678: /* reconstruct and send to muxclient */
1679: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1680: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1681: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1682: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1683: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1684: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1685: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1686: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1687: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1688: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1689: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.354 djm 1690: error_fr(r, "compose for muxclient");
1.289 markus 1691: goto out;
1692: }
1693: }
1694:
1695: out:
1696: sshbuf_free(b);
1.250 djm 1697: free(originator_address);
1698: free(listen_address);
1.40 markus 1699: return c;
1700: }
1701:
1.103 deraadt 1702: static Channel *
1.303 djm 1703: client_request_forwarded_streamlocal(struct ssh *ssh,
1704: const char *request_type, int rchan)
1.261 millert 1705: {
1706: Channel *c = NULL;
1707: char *listen_path;
1.320 djm 1708: int r;
1.261 millert 1709:
1710: /* Get the remote path. */
1.320 djm 1711: if ((r = sshpkt_get_cstring(ssh, &listen_path, NULL)) != 0 ||
1712: (r = sshpkt_get_string(ssh, NULL, NULL)) != 0 || /* reserved */
1713: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1714: fatal_fr(r, "parse packet");
1.261 millert 1715:
1.354 djm 1716: debug_f("request: %s", listen_path);
1.261 millert 1717:
1.303 djm 1718: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1719: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1720: free(listen_path);
1721: return c;
1722: }
1723:
1724: static Channel *
1.303 djm 1725: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1726: {
1727: Channel *c = NULL;
1728: char *originator;
1.321 djm 1729: u_int originator_port;
1.320 djm 1730: int r, sock;
1.40 markus 1731:
1732: if (!options.forward_x11) {
1733: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1734: error("Warning: this is probably a break-in attempt by a "
1735: "malicious server.");
1.221 djm 1736: return NULL;
1737: }
1.388 dtucker 1738: if (x11_refuse_time != 0 && monotime() >= x11_refuse_time) {
1.221 djm 1739: verbose("Rejected X11 connection after ForwardX11Timeout "
1740: "expired");
1.40 markus 1741: return NULL;
1742: }
1.320 djm 1743: if ((r = sshpkt_get_cstring(ssh, &originator, NULL)) != 0 ||
1.321 djm 1744: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1.320 djm 1745: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1746: fatal_fr(r, "parse packet");
1.40 markus 1747: /* XXX check permission */
1.321 djm 1748: /* XXX range check originator port? */
1749: debug("client_request_x11: request from %s %u", originator,
1.47 markus 1750: originator_port);
1.250 djm 1751: free(originator);
1.303 djm 1752: sock = x11_connect_display(ssh);
1.67 markus 1753: if (sock < 0)
1754: return NULL;
1.303 djm 1755: c = channel_new(ssh, "x11",
1.67 markus 1756: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1757: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1758: c->force_drain = 1;
1.40 markus 1759: return c;
1760: }
1761:
1.103 deraadt 1762: static Channel *
1.303 djm 1763: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1764: {
1765: Channel *c = NULL;
1.262 djm 1766: int r, sock;
1.40 markus 1767:
1768: if (!options.forward_agent) {
1769: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1770: error("Warning: this is probably a break-in attempt by a "
1771: "malicious server.");
1.40 markus 1772: return NULL;
1773: }
1.330 djm 1774: if (forward_agent_sock_path == NULL) {
1775: r = ssh_get_authentication_socket(&sock);
1776: } else {
1777: r = ssh_get_authentication_socket_path(forward_agent_sock_path, &sock);
1778: }
1779: if (r != 0) {
1.262 djm 1780: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.354 djm 1781: debug_fr(r, "ssh_get_authentication_socket");
1.67 markus 1782: return NULL;
1.262 djm 1783: }
1.372 djm 1784: if ((r = ssh_agent_bind_hostkey(sock, ssh->kex->initial_hostkey,
1785: ssh->kex->session_id, ssh->kex->initial_sig, 1)) == 0)
1786: debug_f("bound agent to hostkey");
1787: else
1788: debug2_fr(r, "ssh_agent_bind_hostkey");
1789:
1.303 djm 1790: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1791: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1792: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1793: "authentication agent connection", 1);
1.82 markus 1794: c->force_drain = 1;
1.40 markus 1795: return c;
1.180 djm 1796: }
1797:
1.306 djm 1798: char *
1.303 djm 1799: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1.343 djm 1800: int local_tun, int remote_tun, channel_open_fn *cb, void *cbctx)
1.180 djm 1801: {
1802: Channel *c;
1.320 djm 1803: int r, fd;
1.306 djm 1804: char *ifname = NULL;
1.180 djm 1805:
1806: if (tun_mode == SSH_TUNMODE_NO)
1807: return 0;
1808:
1809: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1810:
1811: /* Open local tunnel device */
1.306 djm 1812: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1813: error("Tunnel device open failed.");
1.306 djm 1814: return NULL;
1.180 djm 1815: }
1.306 djm 1816: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1817:
1.303 djm 1818: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1819: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1820: c->datagram = 1;
1.343 djm 1821:
1822: if (cb != NULL)
1823: channel_register_open_confirm(ssh, c->self, cb, cbctx);
1.180 djm 1824:
1.320 djm 1825: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1826: (r = sshpkt_put_cstring(ssh, "tun@openssh.com")) != 0 ||
1827: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1828: (r = sshpkt_put_u32(ssh, c->local_window_max)) != 0 ||
1829: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1830: (r = sshpkt_put_u32(ssh, tun_mode)) != 0 ||
1831: (r = sshpkt_put_u32(ssh, remote_tun)) != 0 ||
1832: (r = sshpkt_send(ssh)) != 0)
1.321 djm 1833: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.180 djm 1834:
1.306 djm 1835: return ifname;
1.40 markus 1836: }
1837:
1.22 markus 1838: /* XXXX move to generic input handler */
1.264 markus 1839: static int
1.297 markus 1840: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1841: {
1842: Channel *c = NULL;
1.320 djm 1843: char *ctype = NULL;
1844: int r;
1845: u_int rchan;
1846: size_t len;
1847: u_int rmaxpack, rwindow;
1848:
1849: if ((r = sshpkt_get_cstring(ssh, &ctype, &len)) != 0 ||
1850: (r = sshpkt_get_u32(ssh, &rchan)) != 0 ||
1851: (r = sshpkt_get_u32(ssh, &rwindow)) != 0 ||
1852: (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0)
1853: goto out;
1.22 markus 1854:
1.24 markus 1855: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1856: ctype, rchan, rwindow, rmaxpack);
1857:
1.40 markus 1858: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1859: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1860: rmaxpack);
1.261 millert 1861: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1862: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1863: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1864: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1865: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1866: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1867: }
1.289 markus 1868: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1869: debug3("proxied to downstream: %s", ctype);
1870: } else if (c != NULL) {
1.22 markus 1871: debug("confirm %s", ctype);
1872: c->remote_id = rchan;
1.304 djm 1873: c->have_remote_id = 1;
1.22 markus 1874: c->remote_window = rwindow;
1875: c->remote_maxpacket = rmaxpack;
1.69 markus 1876: if (c->type != SSH_CHANNEL_CONNECTING) {
1.320 djm 1877: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1878: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1879: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1880: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1881: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1882: (r = sshpkt_send(ssh)) != 0)
1883: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.69 markus 1884: }
1.22 markus 1885: } else {
1886: debug("failure %s", ctype);
1.320 djm 1887: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
1888: (r = sshpkt_put_u32(ssh, rchan)) != 0 ||
1889: (r = sshpkt_put_u32(ssh, SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED)) != 0 ||
1890: (r = sshpkt_put_cstring(ssh, "open failed")) != 0 ||
1891: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1892: (r = sshpkt_send(ssh)) != 0)
1893: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.22 markus 1894: }
1.320 djm 1895: r = 0;
1896: out:
1.250 djm 1897: free(ctype);
1.320 djm 1898: return r;
1.22 markus 1899: }
1.267 djm 1900:
1.264 markus 1901: static int
1.297 markus 1902: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1903: {
1904: Channel *c = NULL;
1.320 djm 1905: char *rtype = NULL;
1906: u_char reply;
1907: u_int id, exitval;
1908: int r, success = 0;
1909:
1910: if ((r = sshpkt_get_u32(ssh, &id)) != 0)
1911: return r;
1912: if (id <= INT_MAX)
1913: c = channel_lookup(ssh, id);
1.297 markus 1914: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1915: return 0;
1.320 djm 1916: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
1917: (r = sshpkt_get_u8(ssh, &reply)) != 0)
1918: goto out;
1.48 markus 1919:
1.320 djm 1920: debug("client_input_channel_req: channel %u rtype %s reply %d",
1.48 markus 1921: id, rtype, reply);
1922:
1.320 djm 1923: if (c == NULL) {
1.197 djm 1924: error("client_input_channel_req: channel %d: "
1925: "unknown channel", id);
1.193 markus 1926: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1.320 djm 1927: if ((r = sshpkt_get_end(ssh)) != 0)
1928: goto out;
1.303 djm 1929: chan_rcvd_eow(ssh, c);
1.48 markus 1930: } else if (strcmp(rtype, "exit-status") == 0) {
1.320 djm 1931: if ((r = sshpkt_get_u32(ssh, &exitval)) != 0)
1932: goto out;
1.217 djm 1933: if (c->ctl_chan != -1) {
1.303 djm 1934: mux_exit_message(ssh, c, exitval);
1.215 djm 1935: success = 1;
1.320 djm 1936: } else if ((int)id == session_ident) {
1.215 djm 1937: /* Record exit value of local session */
1.123 djm 1938: success = 1;
1939: exit_status = exitval;
1.215 djm 1940: } else {
1.218 djm 1941: /* Probably for a mux channel that has already closed */
1.354 djm 1942: debug_f("no sink for exit-status on channel %d",
1943: id);
1.123 djm 1944: }
1.320 djm 1945: if ((r = sshpkt_get_end(ssh)) != 0)
1946: goto out;
1.48 markus 1947: }
1.259 djm 1948: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1949: if (!c->have_remote_id)
1.354 djm 1950: fatal_f("channel %d: no remote_id", c->self);
1.320 djm 1951: if ((r = sshpkt_start(ssh, success ?
1952: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE)) != 0 ||
1953: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1954: (r = sshpkt_send(ssh)) != 0)
1955: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.48 markus 1956: }
1.320 djm 1957: r = 0;
1958: out:
1.250 djm 1959: free(rtype);
1.320 djm 1960: return r;
1.48 markus 1961: }
1.267 djm 1962:
1.269 djm 1963: struct hostkeys_update_ctx {
1964: /* The hostname and (optionally) IP address string for the server */
1965: char *host_str, *ip_str;
1966:
1967: /*
1968: * Keys received from the server and a flag for each indicating
1969: * whether they already exist in known_hosts.
1.351 djm 1970: * keys_match is filled in by hostkeys_find() and later (for new
1.381 djm 1971: * keys) by client_global_hostkeys_prove_confirm().
1.269 djm 1972: */
1973: struct sshkey **keys;
1.351 djm 1974: u_int *keys_match; /* mask of HKF_MATCH_* from hostfile.h */
1975: int *keys_verified; /* flag for new keys verified by server */
1976: size_t nkeys, nnew, nincomplete; /* total, new keys, incomplete match */
1.269 djm 1977:
1978: /*
1979: * Keys that are in known_hosts, but were not present in the update
1980: * from the server (i.e. scheduled to be deleted).
1981: * Filled in by hostkeys_find().
1982: */
1983: struct sshkey **old_keys;
1984: size_t nold;
1.347 djm 1985:
1986: /* Various special cases. */
1.350 djm 1987: int complex_hostspec; /* wildcard or manual pattern-list host name */
1.347 djm 1988: int ca_available; /* saw CA key for this host */
1.352 djm 1989: int old_key_seen; /* saw old key with other name/addr */
1.353 djm 1990: int other_name_seen; /* saw key with other name/addr */
1.269 djm 1991: };
1992:
1993: static void
1994: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1995: {
1996: size_t i;
1997:
1998: if (ctx == NULL)
1999: return;
2000: for (i = 0; i < ctx->nkeys; i++)
2001: sshkey_free(ctx->keys[i]);
2002: free(ctx->keys);
1.351 djm 2003: free(ctx->keys_match);
2004: free(ctx->keys_verified);
1.269 djm 2005: for (i = 0; i < ctx->nold; i++)
2006: sshkey_free(ctx->old_keys[i]);
2007: free(ctx->old_keys);
2008: free(ctx->host_str);
2009: free(ctx->ip_str);
2010: free(ctx);
2011: }
2012:
1.350 djm 2013: /*
2014: * Returns non-zero if a known_hosts hostname list is not of a form that
2015: * can be handled by UpdateHostkeys. These include wildcard hostnames and
2016: * hostnames lists that do not follow the form host[,ip].
2017: */
2018: static int
2019: hostspec_is_complex(const char *hosts)
2020: {
2021: char *cp;
2022:
2023: /* wildcard */
2024: if (strchr(hosts, '*') != NULL || strchr(hosts, '?') != NULL)
2025: return 1;
2026: /* single host/ip = ok */
2027: if ((cp = strchr(hosts, ',')) == NULL)
2028: return 0;
2029: /* more than two entries on the line */
2030: if (strchr(cp + 1, ',') != NULL)
2031: return 1;
2032: /* XXX maybe parse cp+1 and ensure it is an IP? */
2033: return 0;
2034: }
2035:
1.352 djm 2036: /* callback to search for ctx->keys in known_hosts */
1.269 djm 2037: static int
2038: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
2039: {
2040: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2041: size_t i;
2042: struct sshkey **tmp;
2043:
1.353 djm 2044: if (l->key == NULL)
1.269 djm 2045: return 0;
1.353 djm 2046: if (l->status != HKF_STATUS_MATCHED) {
2047: /* Record if one of the keys appears on a non-matching line */
2048: for (i = 0; i < ctx->nkeys; i++) {
2049: if (sshkey_equal(l->key, ctx->keys[i])) {
2050: ctx->other_name_seen = 1;
1.354 djm 2051: debug3_f("found %s key under different "
2052: "name/addr at %s:%ld",
1.353 djm 2053: sshkey_ssh_name(ctx->keys[i]),
2054: l->path, l->linenum);
2055: return 0;
2056: }
2057: }
2058: return 0;
2059: }
2060: /* Don't proceed if revocation or CA markers are present */
2061: /* XXX relax this */
2062: if (l->marker != MRK_NONE) {
1.354 djm 2063: debug3_f("hostkeys file %s:%ld has CA/revocation marker",
2064: l->path, l->linenum);
1.353 djm 2065: ctx->complex_hostspec = 1;
2066: return 0;
2067: }
2068:
1.355 djm 2069: /* If CheckHostIP is enabled, then check for mismatched hostname/addr */
2070: if (ctx->ip_str != NULL && strchr(l->hosts, ',') != NULL) {
2071: if ((l->match & HKF_MATCH_HOST) == 0) {
2072: /* Record if address matched a different hostname. */
2073: ctx->other_name_seen = 1;
2074: debug3_f("found address %s against different hostname "
2075: "at %s:%ld", ctx->ip_str, l->path, l->linenum);
2076: return 0;
2077: } else if ((l->match & HKF_MATCH_IP) == 0) {
2078: /* Record if hostname matched a different address. */
2079: ctx->other_name_seen = 1;
2080: debug3_f("found hostname %s against different address "
2081: "at %s:%ld", ctx->host_str, l->path, l->linenum);
2082: }
1.353 djm 2083: }
1.269 djm 2084:
1.350 djm 2085: /*
2086: * UpdateHostkeys is skipped for wildcard host names and hostnames
2087: * that contain more than two entries (ssh never writes these).
2088: */
2089: if (hostspec_is_complex(l->hosts)) {
1.354 djm 2090: debug3_f("hostkeys file %s:%ld complex host specification",
2091: l->path, l->linenum);
1.350 djm 2092: ctx->complex_hostspec = 1;
1.347 djm 2093: return 0;
2094: }
2095:
1.269 djm 2096: /* Mark off keys we've already seen for this host */
2097: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2098: if (!sshkey_equal(l->key, ctx->keys[i]))
2099: continue;
1.354 djm 2100: debug3_f("found %s key at %s:%ld",
1.351 djm 2101: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
2102: ctx->keys_match[i] |= l->match;
2103: return 0;
1.269 djm 2104: }
2105: /* This line contained a key that not offered by the server */
1.354 djm 2106: debug3_f("deprecated %s key at %s:%ld", sshkey_ssh_name(l->key),
2107: l->path, l->linenum);
1.299 deraadt 2108: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 2109: sizeof(*ctx->old_keys))) == NULL)
1.354 djm 2110: fatal_f("recallocarray failed nold = %zu", ctx->nold);
1.269 djm 2111: ctx->old_keys = tmp;
2112: ctx->old_keys[ctx->nold++] = l->key;
2113: l->key = NULL;
2114:
2115: return 0;
2116: }
2117:
1.352 djm 2118: /* callback to search for ctx->old_keys in known_hosts under other names */
2119: static int
2120: hostkeys_check_old(struct hostkey_foreach_line *l, void *_ctx)
2121: {
2122: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2123: size_t i;
2124: int hashed;
2125:
2126: /* only care about lines that *don't* match the active host spec */
2127: if (l->status == HKF_STATUS_MATCHED || l->key == NULL)
2128: return 0;
2129:
2130: hashed = l->match & (HKF_MATCH_HOST_HASHED|HKF_MATCH_IP_HASHED);
2131: for (i = 0; i < ctx->nold; i++) {
2132: if (!sshkey_equal(l->key, ctx->old_keys[i]))
2133: continue;
1.354 djm 2134: debug3_f("found deprecated %s key at %s:%ld as %s",
1.364 djm 2135: sshkey_ssh_name(ctx->old_keys[i]), l->path, l->linenum,
1.352 djm 2136: hashed ? "[HASHED]" : l->hosts);
2137: ctx->old_key_seen = 1;
2138: break;
2139: }
2140: return 0;
2141: }
2142:
2143: /*
2144: * Check known_hosts files for deprecated keys under other names. Returns 0
2145: * on success or -1 on failure. Updates ctx->old_key_seen if deprecated keys
2146: * exist under names other than the active hostname/IP.
2147: */
2148: static int
2149: check_old_keys_othernames(struct hostkeys_update_ctx *ctx)
2150: {
2151: size_t i;
2152: int r;
2153:
1.354 djm 2154: debug2_f("checking for %zu deprecated keys", ctx->nold);
1.352 djm 2155: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2156: debug3_f("searching %s for %s / %s",
1.352 djm 2157: options.user_hostfiles[i], ctx->host_str,
2158: ctx->ip_str ? ctx->ip_str : "(none)");
2159: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2160: hostkeys_check_old, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2161: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.352 djm 2162: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2163: debug_f("hostkeys file %s does not exist",
2164: options.user_hostfiles[i]);
1.352 djm 2165: continue;
2166: }
1.354 djm 2167: error_fr(r, "hostkeys_foreach failed for %s",
2168: options.user_hostfiles[i]);
1.352 djm 2169: return -1;
2170: }
2171: }
2172: return 0;
2173: }
2174:
1.269 djm 2175: static void
1.337 djm 2176: hostkey_change_preamble(LogLevel loglevel)
1.269 djm 2177: {
1.336 djm 2178: do_log2(loglevel, "The server has updated its host keys.");
2179: do_log2(loglevel, "These changes were verified by the server's "
2180: "existing trusted key.");
2181: }
2182:
2183: static void
2184: update_known_hosts(struct hostkeys_update_ctx *ctx)
2185: {
2186: int r, was_raw = 0, first = 1;
2187: int asking = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK;
2188: LogLevel loglevel = asking ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1.269 djm 2189: char *fp, *response;
2190: size_t i;
1.333 djm 2191: struct stat sb;
1.269 djm 2192:
2193: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2194: if (!ctx->keys_verified[i])
1.269 djm 2195: continue;
2196: if ((fp = sshkey_fingerprint(ctx->keys[i],
2197: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2198: fatal_f("sshkey_fingerprint failed");
1.336 djm 2199: if (first && asking)
1.337 djm 2200: hostkey_change_preamble(loglevel);
1.269 djm 2201: do_log2(loglevel, "Learned new hostkey: %s %s",
2202: sshkey_type(ctx->keys[i]), fp);
1.336 djm 2203: first = 0;
1.269 djm 2204: free(fp);
2205: }
2206: for (i = 0; i < ctx->nold; i++) {
2207: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2208: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2209: fatal_f("sshkey_fingerprint failed");
1.336 djm 2210: if (first && asking)
1.337 djm 2211: hostkey_change_preamble(loglevel);
1.269 djm 2212: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2213: sshkey_type(ctx->old_keys[i]), fp);
1.336 djm 2214: first = 0;
1.269 djm 2215: free(fp);
2216: }
2217: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2218: if (get_saved_tio() != NULL) {
2219: leave_raw_mode(1);
2220: was_raw = 1;
2221: }
1.269 djm 2222: response = NULL;
2223: for (i = 0; !quit_pending && i < 3; i++) {
2224: free(response);
2225: response = read_passphrase("Accept updated hostkeys? "
2226: "(yes/no): ", RP_ECHO);
1.389 dtucker 2227: if (response != NULL && strcasecmp(response, "yes") == 0)
1.269 djm 2228: break;
2229: else if (quit_pending || response == NULL ||
2230: strcasecmp(response, "no") == 0) {
2231: options.update_hostkeys = 0;
2232: break;
2233: } else {
2234: do_log2(loglevel, "Please enter "
2235: "\"yes\" or \"no\"");
2236: }
2237: }
2238: if (quit_pending || i >= 3 || response == NULL)
2239: options.update_hostkeys = 0;
2240: free(response);
1.271 djm 2241: if (was_raw)
2242: enter_raw_mode(1);
1.269 djm 2243: }
1.333 djm 2244: if (options.update_hostkeys == 0)
2245: return;
1.269 djm 2246: /*
2247: * Now that all the keys are verified, we can go ahead and replace
2248: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2249: * cancel the operation).
2250: */
1.333 djm 2251: for (i = 0; i < options.num_user_hostfiles; i++) {
2252: /*
2253: * NB. keys are only added to hostfiles[0], for the rest we
2254: * just delete the hostname entries.
2255: */
2256: if (stat(options.user_hostfiles[i], &sb) != 0) {
2257: if (errno == ENOENT) {
1.354 djm 2258: debug_f("known hosts file %s does not "
2259: "exist", options.user_hostfiles[i]);
1.333 djm 2260: } else {
1.354 djm 2261: error_f("known hosts file %s "
2262: "inaccessible: %s",
2263: options.user_hostfiles[i], strerror(errno));
1.333 djm 2264: }
2265: continue;
2266: }
2267: if ((r = hostfile_replace_entries(options.user_hostfiles[i],
2268: ctx->host_str, ctx->ip_str,
2269: i == 0 ? ctx->keys : NULL, i == 0 ? ctx->nkeys : 0,
2270: options.hash_known_hosts, 0,
2271: options.fingerprint_hash)) != 0) {
1.354 djm 2272: error_fr(r, "hostfile_replace_entries failed for %s",
2273: options.user_hostfiles[i]);
1.333 djm 2274: }
2275: }
1.269 djm 2276: }
2277:
2278: static void
1.381 djm 2279: client_global_hostkeys_prove_confirm(struct ssh *ssh, int type,
1.303 djm 2280: u_int32_t seq, void *_ctx)
1.269 djm 2281: {
2282: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2283: size_t i, ndone;
2284: struct sshbuf *signdata;
1.375 djm 2285: int r, plaintype;
1.269 djm 2286: const u_char *sig;
1.375 djm 2287: const char *rsa_kexalg = NULL;
2288: char *alg = NULL;
1.269 djm 2289: size_t siglen;
2290:
2291: if (ctx->nnew == 0)
1.354 djm 2292: fatal_f("ctx->nnew == 0"); /* sanity */
1.269 djm 2293: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2294: error("Server failed to confirm ownership of "
2295: "private host keys");
2296: hostkeys_update_ctx_free(ctx);
2297: return;
2298: }
1.375 djm 2299: if (sshkey_type_plain(sshkey_type_from_name(
2300: ssh->kex->hostkey_alg)) == KEY_RSA)
2301: rsa_kexalg = ssh->kex->hostkey_alg;
1.269 djm 2302: if ((signdata = sshbuf_new()) == NULL)
1.354 djm 2303: fatal_f("sshbuf_new failed");
1.269 djm 2304: /*
2305: * Expect a signature for each of the ctx->nnew private keys we
2306: * haven't seen before. They will be in the same order as the
1.351 djm 2307: * ctx->keys where the corresponding ctx->keys_match[i] == 0.
1.269 djm 2308: */
2309: for (ndone = i = 0; i < ctx->nkeys; i++) {
1.351 djm 2310: if (ctx->keys_match[i])
1.269 djm 2311: continue;
1.375 djm 2312: plaintype = sshkey_type_plain(ctx->keys[i]->type);
1.269 djm 2313: /* Prepare data to be signed: session ID, unique string, key */
2314: sshbuf_reset(signdata);
1.270 djm 2315: if ( (r = sshbuf_put_cstring(signdata,
2316: "hostkeys-prove-00@openssh.com")) != 0 ||
1.358 djm 2317: (r = sshbuf_put_stringb(signdata,
2318: ssh->kex->session_id)) != 0 ||
1.269 djm 2319: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1.354 djm 2320: fatal_fr(r, "compose signdata");
1.269 djm 2321: /* Extract and verify signature */
2322: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1.354 djm 2323: error_fr(r, "parse sig");
1.269 djm 2324: goto out;
2325: }
1.375 djm 2326: if ((r = sshkey_get_sigtype(sig, siglen, &alg)) != 0) {
2327: error_fr(r, "server gave unintelligible signature "
2328: "for %s key %zu", sshkey_type(ctx->keys[i]), i);
2329: goto out;
2330: }
1.309 djm 2331: /*
1.375 djm 2332: * Special case for RSA keys: if a RSA hostkey was negotiated,
2333: * then use its signature type for verification of RSA hostkey
2334: * proofs. Otherwise, accept only RSA-SHA256/512 signatures.
1.309 djm 2335: */
1.375 djm 2336: if (plaintype == KEY_RSA && rsa_kexalg == NULL &&
2337: match_pattern_list(alg, HOSTKEY_PROOF_RSA_ALGS, 0) != 1) {
2338: debug_f("server used untrusted RSA signature algorithm "
2339: "%s for key %zu, disregarding", alg, i);
2340: free(alg);
2341: /* zap the key from the list */
2342: sshkey_free(ctx->keys[i]);
2343: ctx->keys[i] = NULL;
2344: ndone++;
2345: continue;
2346: }
2347: debug3_f("verify %s key %zu using sigalg %s",
2348: sshkey_type(ctx->keys[i]), i, alg);
2349: free(alg);
1.269 djm 2350: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 2351: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.375 djm 2352: plaintype == KEY_RSA ? rsa_kexalg : NULL, 0, NULL)) != 0) {
1.361 djm 2353: error_fr(r, "server gave bad signature for %s key %zu",
1.354 djm 2354: sshkey_type(ctx->keys[i]), i);
1.269 djm 2355: goto out;
2356: }
2357: /* Key is good. Mark it as 'seen' */
1.351 djm 2358: ctx->keys_verified[i] = 1;
1.269 djm 2359: ndone++;
2360: }
1.354 djm 2361: /* Shouldn't happen */
1.269 djm 2362: if (ndone != ctx->nnew)
1.354 djm 2363: fatal_f("ndone != ctx->nnew (%zu / %zu)", ndone, ctx->nnew);
1.320 djm 2364: if ((r = sshpkt_get_end(ssh)) != 0) {
1.354 djm 2365: error_f("protocol error");
1.320 djm 2366: goto out;
2367: }
1.269 djm 2368:
2369: /* Make the edits to known_hosts */
2370: update_known_hosts(ctx);
2371: out:
2372: hostkeys_update_ctx_free(ctx);
1.384 djm 2373: hostkeys_update_complete = 1;
2374: client_repledge();
1.269 djm 2375: }
2376:
1.267 djm 2377: /*
1.291 djm 2378: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
2379: * Made slightly less trivial by the multiple RSA signature algorithm names.
2380: */
2381: static int
2382: key_accepted_by_hostkeyalgs(const struct sshkey *key)
2383: {
2384: const char *ktype = sshkey_ssh_name(key);
1.331 dtucker 2385: const char *hostkeyalgs = options.hostkeyalgorithms;
1.291 djm 2386:
1.391 djm 2387: if (key->type == KEY_UNSPEC)
1.291 djm 2388: return 0;
2389: if (key->type == KEY_RSA &&
2390: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
2391: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
2392: return 1;
2393: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
2394: }
2395:
2396: /*
1.270 djm 2397: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2398: * the server's hostkeys. The keys are checked against the user's
2399: * HostkeyAlgorithms preference before they are accepted.
2400: */
2401: static int
1.321 djm 2402: client_input_hostkeys(struct ssh *ssh)
1.267 djm 2403: {
2404: const u_char *blob = NULL;
1.269 djm 2405: size_t i, len = 0;
1.267 djm 2406: struct sshbuf *buf = NULL;
1.269 djm 2407: struct sshkey *key = NULL, **tmp;
1.384 djm 2408: int r, prove_sent = 0;
1.269 djm 2409: char *fp;
1.267 djm 2410: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2411: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2412: struct hostkeys_update_ctx *ctx = NULL;
1.351 djm 2413: u_int want;
1.267 djm 2414:
2415: if (hostkeys_seen)
1.354 djm 2416: fatal_f("server already sent hostkeys");
1.384 djm 2417: if (!can_update_hostkeys())
1.267 djm 2418: return 1;
1.384 djm 2419: hostkeys_seen = 1;
1.272 djm 2420:
2421: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2422: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2423: sshkey_free(key);
2424: key = NULL;
1.269 djm 2425: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
1.354 djm 2426: error_fr(r, "parse key");
1.269 djm 2427: goto out;
2428: }
1.270 djm 2429: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
1.354 djm 2430: do_log2_fr(r, r == SSH_ERR_KEY_TYPE_UNKNOWN ?
1.335 djm 2431: SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR,
1.354 djm 2432: "convert key");
1.335 djm 2433: continue;
1.270 djm 2434: }
1.267 djm 2435: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2436: SSH_FP_DEFAULT);
1.354 djm 2437: debug3_f("received %s key %s", sshkey_type(key), fp);
1.267 djm 2438: free(fp);
1.275 markus 2439:
1.291 djm 2440: if (!key_accepted_by_hostkeyalgs(key)) {
1.354 djm 2441: debug3_f("%s key not permitted by "
2442: "HostkeyAlgorithms", sshkey_ssh_name(key));
1.267 djm 2443: continue;
2444: }
1.269 djm 2445: /* Skip certs */
2446: if (sshkey_is_cert(key)) {
1.354 djm 2447: debug3_f("%s key is a certificate; skipping",
2448: sshkey_ssh_name(key));
1.269 djm 2449: continue;
2450: }
2451: /* Ensure keys are unique */
2452: for (i = 0; i < ctx->nkeys; i++) {
2453: if (sshkey_equal(key, ctx->keys[i])) {
1.354 djm 2454: error_f("received duplicated %s host key",
2455: sshkey_ssh_name(key));
1.269 djm 2456: goto out;
2457: }
2458: }
2459: /* Key is good, record it */
1.299 deraadt 2460: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2461: sizeof(*ctx->keys))) == NULL)
1.354 djm 2462: fatal_f("recallocarray failed nkeys = %zu",
2463: ctx->nkeys);
1.269 djm 2464: ctx->keys = tmp;
2465: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2466: key = NULL;
2467: }
2468:
1.269 djm 2469: if (ctx->nkeys == 0) {
1.354 djm 2470: debug_f("server sent no hostkeys");
1.267 djm 2471: goto out;
2472: }
1.270 djm 2473:
1.351 djm 2474: if ((ctx->keys_match = calloc(ctx->nkeys,
2475: sizeof(*ctx->keys_match))) == NULL ||
2476: (ctx->keys_verified = calloc(ctx->nkeys,
2477: sizeof(*ctx->keys_verified))) == NULL)
1.354 djm 2478: fatal_f("calloc failed");
1.267 djm 2479:
1.268 djm 2480: get_hostfile_hostname_ipaddr(host,
2481: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2482: options.port, &ctx->host_str,
2483: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2484:
1.269 djm 2485: /* Find which keys we already know about. */
1.333 djm 2486: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2487: debug_f("searching %s for %s / %s",
1.339 dtucker 2488: options.user_hostfiles[i], ctx->host_str,
1.340 dtucker 2489: ctx->ip_str ? ctx->ip_str : "(none)");
1.333 djm 2490: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2491: hostkeys_find, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2492: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.333 djm 2493: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2494: debug_f("hostkeys file %s does not exist",
2495: options.user_hostfiles[i]);
1.333 djm 2496: continue;
2497: }
1.354 djm 2498: error_fr(r, "hostkeys_foreach failed for %s",
2499: options.user_hostfiles[i]);
1.333 djm 2500: goto out;
2501: }
1.267 djm 2502: }
2503:
1.269 djm 2504: /* Figure out if we have any new keys to add */
1.351 djm 2505: ctx->nnew = ctx->nincomplete = 0;
2506: want = HKF_MATCH_HOST | ( options.check_host_ip ? HKF_MATCH_IP : 0);
1.269 djm 2507: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2508: if (ctx->keys_match[i] == 0)
1.269 djm 2509: ctx->nnew++;
1.351 djm 2510: if ((ctx->keys_match[i] & want) != want)
2511: ctx->nincomplete++;
1.269 djm 2512: }
2513:
1.354 djm 2514: debug3_f("%zu server keys: %zu new, %zu retained, "
2515: "%zu incomplete match. %zu to remove", ctx->nkeys, ctx->nnew,
2516: ctx->nkeys - ctx->nnew - ctx->nincomplete,
1.351 djm 2517: ctx->nincomplete, ctx->nold);
1.269 djm 2518:
1.353 djm 2519: if (ctx->nnew == 0 && ctx->nold == 0) {
1.354 djm 2520: debug_f("no new or deprecated keys from server");
1.353 djm 2521: goto out;
2522: }
2523:
2524: /* Various reasons why we cannot proceed with the update */
2525: if (ctx->complex_hostspec) {
1.354 djm 2526: debug_f("CA/revocation marker, manual host list or wildcard "
2527: "host pattern found, skipping UserKnownHostsFile update");
1.353 djm 2528: goto out;
2529: }
2530: if (ctx->other_name_seen) {
1.354 djm 2531: debug_f("host key found matching a different name/address, "
2532: "skipping UserKnownHostsFile update");
1.347 djm 2533: goto out;
1.352 djm 2534: }
2535: /*
2536: * If removing keys, check whether they appear under different
2537: * names/addresses and refuse to proceed if they do. This avoids
2538: * cases such as hosts with multiple names becoming inconsistent
2539: * with regards to CheckHostIP entries.
2540: * XXX UpdateHostkeys=force to override this (and other) checks?
2541: */
2542: if (ctx->nold != 0) {
2543: if (check_old_keys_othernames(ctx) != 0)
2544: goto out; /* error already logged */
2545: if (ctx->old_key_seen) {
1.354 djm 2546: debug_f("key(s) for %s%s%s exist under other names; "
2547: "skipping UserKnownHostsFile update",
1.352 djm 2548: ctx->host_str, ctx->ip_str == NULL ? "" : ",",
2549: ctx->ip_str == NULL ? "" : ctx->ip_str);
2550: goto out;
2551: }
2552: }
2553:
1.353 djm 2554: if (ctx->nnew == 0) {
1.351 djm 2555: /*
2556: * We have some keys to remove or fix matching for.
2557: * We can proceed to do this without requiring a fresh proof
2558: * from the server.
2559: */
1.269 djm 2560: update_known_hosts(ctx);
1.353 djm 2561: goto out;
2562: }
2563: /*
2564: * We have received previously-unseen keys from the server.
2565: * Ask the server to confirm ownership of the private halves.
2566: */
1.354 djm 2567: debug3_f("asking server to prove ownership for %zu keys", ctx->nnew);
1.353 djm 2568: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2569: (r = sshpkt_put_cstring(ssh,
2570: "hostkeys-prove-00@openssh.com")) != 0 ||
2571: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
1.354 djm 2572: fatal_fr(r, "prepare hostkeys-prove");
1.353 djm 2573: if ((buf = sshbuf_new()) == NULL)
1.354 djm 2574: fatal_f("sshbuf_new");
1.353 djm 2575: for (i = 0; i < ctx->nkeys; i++) {
2576: if (ctx->keys_match[i])
2577: continue;
2578: sshbuf_reset(buf);
2579: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0 ||
1.354 djm 2580: (r = sshpkt_put_stringb(ssh, buf)) != 0)
2581: fatal_fr(r, "assemble hostkeys-prove");
1.269 djm 2582: }
1.353 djm 2583: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2584: fatal_fr(r, "send hostkeys-prove");
1.353 djm 2585: client_register_global_confirm(
1.381 djm 2586: client_global_hostkeys_prove_confirm, ctx);
1.353 djm 2587: ctx = NULL; /* will be freed in callback */
1.384 djm 2588: prove_sent = 1;
1.269 djm 2589:
1.267 djm 2590: /* Success */
2591: out:
1.269 djm 2592: hostkeys_update_ctx_free(ctx);
1.267 djm 2593: sshkey_free(key);
2594: sshbuf_free(buf);
1.384 djm 2595: if (!prove_sent) {
2596: /* UpdateHostkeys handling completed */
2597: hostkeys_update_complete = 1;
2598: client_repledge();
2599: }
1.269 djm 2600: /*
2601: * NB. Return success for all cases. The server doesn't need to know
2602: * what the client does with its hosts file.
2603: */
2604: return 1;
1.267 djm 2605: }
2606:
1.264 markus 2607: static int
1.297 markus 2608: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2609: {
2610: char *rtype;
1.320 djm 2611: u_char want_reply;
2612: int r, success = 0;
1.95 markus 2613:
1.320 djm 2614: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
2615: (r = sshpkt_get_u8(ssh, &want_reply)) != 0)
2616: goto out;
1.117 markus 2617: debug("client_input_global_request: rtype %s want_reply %d",
2618: rtype, want_reply);
1.270 djm 2619: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.321 djm 2620: success = client_input_hostkeys(ssh);
1.95 markus 2621: if (want_reply) {
1.320 djm 2622: if ((r = sshpkt_start(ssh, success ? SSH2_MSG_REQUEST_SUCCESS :
2623: SSH2_MSG_REQUEST_FAILURE)) != 0 ||
2624: (r = sshpkt_send(ssh)) != 0 ||
2625: (r = ssh_packet_write_wait(ssh)) != 0)
2626: goto out;
1.95 markus 2627: }
1.320 djm 2628: r = 0;
2629: out:
1.250 djm 2630: free(rtype);
1.320 djm 2631: return r;
1.95 markus 2632: }
1.22 markus 2633:
1.354 djm 2634: static void
2635: client_send_env(struct ssh *ssh, int id, const char *name, const char *val)
2636: {
2637: int r;
2638:
2639: debug("channel %d: setting env %s = \"%s\"", id, name, val);
2640: channel_request_start(ssh, id, "env", 0);
2641: if ((r = sshpkt_put_cstring(ssh, name)) != 0 ||
2642: (r = sshpkt_put_cstring(ssh, val)) != 0 ||
2643: (r = sshpkt_send(ssh)) != 0)
2644: fatal_fr(r, "send setenv");
2645: }
2646:
1.123 djm 2647: void
1.303 djm 2648: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.315 markus 2649: const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd,
2650: char **env)
1.123 djm 2651: {
1.380 djm 2652: size_t i, j, len;
2653: int matched, r;
1.313 djm 2654: char *name, *val;
1.132 djm 2655: Channel *c = NULL;
1.123 djm 2656:
1.354 djm 2657: debug2_f("id %d", id);
1.123 djm 2658:
1.303 djm 2659: if ((c = channel_lookup(ssh, id)) == NULL)
1.354 djm 2660: fatal_f("channel %d: unknown channel", id);
1.224 djm 2661:
1.320 djm 2662: ssh_packet_set_interactive(ssh, want_tty,
1.224 djm 2663: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2664:
1.123 djm 2665: if (want_tty) {
2666: struct winsize ws;
2667:
2668: /* Store window size in the packet. */
1.326 deraadt 2669: if (ioctl(in_fd, TIOCGWINSZ, &ws) == -1)
1.123 djm 2670: memset(&ws, 0, sizeof(ws));
2671:
1.303 djm 2672: channel_request_start(ssh, id, "pty-req", 1);
2673: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.320 djm 2674: if ((r = sshpkt_put_cstring(ssh, term != NULL ? term : ""))
2675: != 0 ||
2676: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
2677: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
2678: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
2679: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0)
1.354 djm 2680: fatal_fr(r, "build pty-req");
1.194 djm 2681: if (tiop == NULL)
2682: tiop = get_saved_tio();
1.316 markus 2683: ssh_tty_make_modes(ssh, -1, tiop);
1.320 djm 2684: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2685: fatal_fr(r, "send pty-req");
1.123 djm 2686: /* XXX wait for reply */
1.132 djm 2687: c->client_tty = 1;
1.123 djm 2688: }
2689:
2690: /* Transfer any environment variables from client to server */
1.126 djm 2691: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2692: debug("Sending environment.");
1.126 djm 2693: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2694: /* Split */
1.126 djm 2695: name = xstrdup(env[i]);
1.123 djm 2696: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2697: free(name);
1.123 djm 2698: continue;
2699: }
2700: *val++ = '\0';
2701:
2702: matched = 0;
2703: for (j = 0; j < options.num_send_env; j++) {
2704: if (match_pattern(name, options.send_env[j])) {
2705: matched = 1;
2706: break;
2707: }
2708: }
2709: if (!matched) {
2710: debug3("Ignored env %s", name);
1.250 djm 2711: free(name);
1.123 djm 2712: continue;
2713: }
1.354 djm 2714: client_send_env(ssh, id, name, val);
1.250 djm 2715: free(name);
1.123 djm 2716: }
1.313 djm 2717: }
2718: for (i = 0; i < options.num_setenv; i++) {
2719: /* Split */
2720: name = xstrdup(options.setenv[i]);
2721: if ((val = strchr(name, '=')) == NULL) {
2722: free(name);
2723: continue;
2724: }
2725: *val++ = '\0';
1.354 djm 2726: client_send_env(ssh, id, name, val);
1.313 djm 2727: free(name);
1.123 djm 2728: }
2729:
1.315 markus 2730: len = sshbuf_len(cmd);
1.123 djm 2731: if (len > 0) {
2732: if (len > 900)
2733: len = 900;
2734: if (want_subsystem) {
1.190 djm 2735: debug("Sending subsystem: %.*s",
1.380 djm 2736: (int)len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2737: channel_request_start(ssh, id, "subsystem", 1);
2738: client_expect_confirm(ssh, id, "subsystem",
2739: CONFIRM_CLOSE);
1.123 djm 2740: } else {
1.190 djm 2741: debug("Sending command: %.*s",
1.380 djm 2742: (int)len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2743: channel_request_start(ssh, id, "exec", 1);
2744: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2745: }
1.320 djm 2746: if ((r = sshpkt_put_stringb(ssh, cmd)) != 0 ||
2747: (r = sshpkt_send(ssh)) != 0)
1.354 djm 2748: fatal_fr(r, "send command");
1.123 djm 2749: } else {
1.303 djm 2750: channel_request_start(ssh, id, "shell", 1);
2751: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.354 djm 2752: if ((r = sshpkt_send(ssh)) != 0)
2753: fatal_fr(r, "send shell");
1.123 djm 2754: }
1.384 djm 2755:
2756: session_setup_complete = 1;
2757: client_repledge();
1.123 djm 2758: }
2759:
1.77 itojun 2760: static void
1.321 djm 2761: client_init_dispatch(struct ssh *ssh)
1.16 markus 2762: {
1.321 djm 2763: ssh_dispatch_init(ssh, &dispatch_protocol_error);
1.100 markus 2764:
1.321 djm 2765: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2766: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2767: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2768: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2769: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2770: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2771: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2772: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2773: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2774: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2775: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2776: ssh_dispatch_set(ssh, SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2777:
2778: /* rekeying */
1.321 djm 2779: ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2780:
2781: /* global request reply messages */
1.321 djm 2782: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2783: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2784: }
2785:
2786: void
2787: client_stop_mux(void)
2788: {
2789: if (options.control_path != NULL && muxserver_sock != -1)
2790: unlink(options.control_path);
2791: /*
1.247 dtucker 2792: * If we are in persist mode, or don't have a shell, signal that we
2793: * should close when all active channels are closed.
1.232 djm 2794: */
1.366 djm 2795: if (options.control_persist || options.session_type == SESSION_TYPE_NONE) {
1.232 djm 2796: session_closed = 1;
1.235 djm 2797: setproctitle("[stopped mux]");
2798: }
1.113 markus 2799: }
2800:
2801: /* client specific fatal cleanup */
2802: void
1.114 markus 2803: cleanup_exit(int i)
1.113 markus 2804: {
1.233 djm 2805: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.192 djm 2806: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2807: unlink(options.control_path);
1.223 djm 2808: ssh_kill_proxy_command();
1.114 markus 2809: _exit(i);
1.1 deraadt 2810: }
![[BACK]](/icons/back.gif){kind=icon}
Return to clientloop.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh