Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.393
1.393 ! djm 1: /* $OpenBSD: clientloop.c,v 1.392 2023/04/03 08:10:54 dtucker 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
! 527: obfuscate_keystroke_timing(struct ssh *ssh, struct timespec *timeout)
! 528: {
! 529: static int active;
! 530: static struct timespec next_interval, chaff_until;
! 531: struct timespec now, tmp;
! 532: int just_started = 0, had_keystroke = 0;
! 533: static unsigned long long nchaff;
! 534: char *stop_reason = NULL;
! 535: long long n;
! 536:
! 537: monotime_ts(&now);
! 538:
! 539: if (options.obscure_keystroke_timing_interval <= 0)
! 540: return 1; /* disabled in config */
! 541:
! 542: if (!channel_still_open(ssh) || quit_pending) {
! 543: /* Stop if no channels left of we're waiting for one to close */
! 544: stop_reason = "no active channels";
! 545: } else if (ssh_packet_is_rekeying(ssh)) {
! 546: /* Stop if we're rekeying */
! 547: stop_reason = "rekeying started";
! 548: } else if (!ssh_packet_interactive_data_to_write(ssh) &&
! 549: ssh_packet_have_data_to_write(ssh)) {
! 550: /* Stop if the output buffer has more than a few keystrokes */
! 551: stop_reason = "output buffer filling";
! 552: } else if (active && ssh_packet_have_data_to_write(ssh)) {
! 553: /* Still in active mode and have a keystroke queued. */
! 554: had_keystroke = 1;
! 555: } else if (active) {
! 556: if (timespeccmp(&now, &chaff_until, >=)) {
! 557: /* Stop if there have been no keystrokes for a while */
! 558: stop_reason = "chaff time expired";
! 559: } else if (timespeccmp(&now, &next_interval, >=)) {
! 560: /* Otherwise if we were due to send, then send chaff */
! 561: if (send_chaff(ssh))
! 562: nchaff++;
! 563: }
! 564: }
! 565:
! 566: if (stop_reason != NULL) {
! 567: active = 0;
! 568: debug3_f("stopping: %s (%llu chaff packets sent)",
! 569: stop_reason, nchaff);
! 570: return 1;
! 571: }
! 572:
! 573: /*
! 574: * If we're in interactive mode, and only have a small amount
! 575: * of outbound data, then we assume that the user is typing
! 576: * interactively. In this case, start quantising outbound packets to
! 577: * fixed time intervals to hide inter-keystroke timing.
! 578: */
! 579: if (!active && ssh_packet_interactive_data_to_write(ssh)) {
! 580: debug3_f("starting: interval %d",
! 581: options.obscure_keystroke_timing_interval);
! 582: just_started = had_keystroke = active = 1;
! 583: nchaff = 0;
! 584: ms_to_timespec(&tmp, options.obscure_keystroke_timing_interval);
! 585: timespecadd(&now, &tmp, &next_interval);
! 586: }
! 587:
! 588: /* Don't hold off if obfuscation inactive */
! 589: if (!active)
! 590: return 1;
! 591:
! 592: if (had_keystroke) {
! 593: /*
! 594: * Arrange to send chaff packets for a random interval after
! 595: * the last keystroke was sent.
! 596: */
! 597: ms_to_timespec(&tmp, SSH_KEYSTROKE_CHAFF_MIN_MS +
! 598: arc4random_uniform(SSH_KEYSTROKE_CHAFF_RNG_MS));
! 599: timespecadd(&now, &tmp, &chaff_until);
! 600: }
! 601:
! 602: ptimeout_deadline_monotime_tsp(timeout, &next_interval);
! 603:
! 604: if (just_started)
! 605: return 1;
! 606:
! 607: /* Don't arm output fd for poll until the timing interval has elapsed */
! 608: if (timespeccmp(&now, &next_interval, <))
! 609: return 0;
! 610:
! 611: /* Calculate number of intervals missed since the last check */
! 612: n = (now.tv_sec - next_interval.tv_sec) * 1000 * 1000 * 1000;
! 613: n += now.tv_nsec - next_interval.tv_nsec;
! 614: n /= options.obscure_keystroke_timing_interval * 1000 * 1000;
! 615: n = (n < 0) ? 1 : n + 1;
! 616:
! 617: /* Advance to the next interval */
! 618: ms_to_timespec(&tmp, options.obscure_keystroke_timing_interval * n);
! 619: timespecadd(&now, &tmp, &next_interval);
! 620: return 1;
! 621: }
! 622:
1.13 markus 623: /*
624: * Waits until the client can do something (some data becomes available on
625: * one of the file descriptors).
626: */
1.77 itojun 627: static void
1.374 djm 628: client_wait_until_can_do_something(struct ssh *ssh, struct pollfd **pfdp,
629: u_int *npfd_allocp, u_int *npfd_activep, int rekeying,
630: int *conn_in_readyp, int *conn_out_readyp)
1.11 markus 631: {
1.386 djm 632: struct timespec timeout;
1.393 ! djm 633: int ret, oready;
1.374 djm 634: u_int p;
1.117 markus 635:
1.374 djm 636: *conn_in_readyp = *conn_out_readyp = 0;
1.11 markus 637:
1.374 djm 638: /* Prepare channel poll. First two pollfd entries are reserved */
1.386 djm 639: ptimeout_init(&timeout);
640: channel_prepare_poll(ssh, pfdp, npfd_allocp, npfd_activep, 2, &timeout);
1.374 djm 641: if (*npfd_activep < 2)
642: fatal_f("bad npfd %u", *npfd_activep); /* shouldn't happen */
643:
644: /* channel_prepare_poll could have closed the last channel */
1.303 djm 645: if (session_closed && !channel_still_open(ssh) &&
1.320 djm 646: !ssh_packet_have_data_to_write(ssh)) {
1.374 djm 647: /* clear events since we did not call poll() */
648: for (p = 0; p < *npfd_activep; p++)
649: (*pfdp)[p].revents = 0;
1.292 djm 650: return;
1.16 markus 651: }
1.11 markus 652:
1.393 ! djm 653: oready = obfuscate_keystroke_timing(ssh, &timeout);
! 654:
1.374 djm 655: /* Monitor server connection on reserved pollfd entries */
656: (*pfdp)[0].fd = connection_in;
657: (*pfdp)[0].events = POLLIN;
658: (*pfdp)[1].fd = connection_out;
1.393 ! djm 659: (*pfdp)[1].events = (oready && ssh_packet_have_data_to_write(ssh)) ?
! 660: POLLOUT : 0;
1.11 markus 661:
1.13 markus 662: /*
663: * Wait for something to happen. This will suspend the process until
1.374 djm 664: * some polled descriptor can be read, written, or has some other
1.222 djm 665: * event pending, or a timeout expires.
1.13 markus 666: */
1.386 djm 667: set_control_persist_exit_time(ssh);
668: if (control_persist_exit_time > 0)
669: ptimeout_deadline_monotime(&timeout, control_persist_exit_time);
1.345 dtucker 670: if (options.server_alive_interval > 0)
1.386 djm 671: ptimeout_deadline_monotime(&timeout, server_alive_time);
672: if (options.rekey_interval > 0 && !rekeying) {
673: ptimeout_deadline_sec(&timeout,
1.320 djm 674: ssh_packet_get_rekey_timeout(ssh));
1.386 djm 675: }
1.374 djm 676:
1.393 ! djm 677: ret = ppoll(*pfdp, *npfd_activep, ptimeout_get_tsp(&timeout), NULL);
1.222 djm 678:
1.326 deraadt 679: if (ret == -1) {
1.51 markus 680: /*
1.374 djm 681: * We have to clear the events because we return.
1.51 markus 682: * We have to return, because the mainloop checks for the flags
683: * set by the signal handlers.
684: */
1.374 djm 685: for (p = 0; p < *npfd_activep; p++)
686: (*pfdp)[p].revents = 0;
1.11 markus 687: if (errno == EINTR)
688: return;
689: /* Note: we might still have data in the buffers. */
1.377 djm 690: quit_message("poll: %s", strerror(errno));
1.374 djm 691: return;
692: }
693:
694: *conn_in_readyp = (*pfdp)[0].revents != 0;
695: *conn_out_readyp = (*pfdp)[1].revents != 0;
696:
697: if (options.server_alive_interval > 0 && !*conn_in_readyp &&
698: monotime() >= server_alive_time) {
1.249 dtucker 699: /*
1.374 djm 700: * ServerAlive check is needed. We can't rely on the poll
1.345 dtucker 701: * timing out since traffic on the client side such as port
702: * forwards can keep waking it up.
1.249 dtucker 703: */
1.345 dtucker 704: server_alive_check(ssh);
1.374 djm 705: }
1.11 markus 706: }
707:
1.77 itojun 708: static void
1.315 markus 709: client_suspend_self(struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr)
1.1 deraadt 710: {
1.11 markus 711: /* Flush stdout and stderr buffers. */
1.315 markus 712: if (sshbuf_len(bout) > 0)
713: atomicio(vwrite, fileno(stdout), sshbuf_mutable_ptr(bout),
714: sshbuf_len(bout));
715: if (sshbuf_len(berr) > 0)
716: atomicio(vwrite, fileno(stderr), sshbuf_mutable_ptr(berr),
717: sshbuf_len(berr));
1.11 markus 718:
1.233 djm 719: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 720:
1.305 djm 721: sshbuf_reset(bin);
722: sshbuf_reset(bout);
723: sshbuf_reset(berr);
1.11 markus 724:
725: /* Send the suspend signal to the program itself. */
726: kill(getpid(), SIGTSTP);
727:
1.132 djm 728: /* Reset window sizes in case they have changed */
729: received_window_change_signal = 1;
1.11 markus 730:
1.233 djm 731: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 732: }
733:
1.77 itojun 734: static void
1.374 djm 735: client_process_net_input(struct ssh *ssh)
1.11 markus 736: {
1.378 djm 737: int r;
1.11 markus 738:
1.13 markus 739: /*
740: * Read input from the server, and add any such data to the buffer of
741: * the packet subsystem.
742: */
1.374 djm 743: schedule_server_alive_check();
1.378 djm 744: if ((r = ssh_packet_process_read(ssh, connection_in)) == 0)
745: return; /* success */
746: if (r == SSH_ERR_SYSTEM_ERROR) {
747: if (errno == EAGAIN || errno == EINTR)
748: return;
749: if (errno == EPIPE) {
750: quit_message("Connection to %s closed by remote host.",
751: host);
752: return;
753: }
1.11 markus 754: }
1.378 djm 755: quit_message("Read from remote host %s: %s", host, ssh_err(r));
1.17 markus 756: }
1.16 markus 757:
1.97 jakob 758: static void
1.303 djm 759: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 760: {
1.190 djm 761: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
762: char errmsg[256];
1.315 markus 763: int r, tochan;
1.190 djm 764:
1.234 djm 765: /*
766: * If a TTY was explicitly requested, then a failure to allocate
767: * one is fatal.
768: */
769: if (cr->action == CONFIRM_TTY &&
770: (options.request_tty == REQUEST_TTY_FORCE ||
771: options.request_tty == REQUEST_TTY_YES))
772: cr->action = CONFIRM_CLOSE;
773:
1.312 djm 774: /* XXX suppress on mux _client_ quietmode */
1.190 djm 775: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 776: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 777:
778: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
779: debug2("%s request accepted on channel %d",
780: cr->request_type, c->self);
781: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
782: if (tochan) {
783: snprintf(errmsg, sizeof(errmsg),
784: "%s request failed\r\n", cr->request_type);
785: } else {
786: snprintf(errmsg, sizeof(errmsg),
787: "%s request failed on channel %d",
788: cr->request_type, c->self);
789: }
790: /* If error occurred on primary session channel, then exit */
1.234 djm 791: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 792: fatal("%s", errmsg);
1.234 djm 793: /*
794: * If error occurred on mux client, append to
795: * their stderr.
796: */
797: if (tochan) {
1.360 djm 798: debug3_f("channel %d: mux request: %s", c->self,
799: cr->request_type);
1.315 markus 800: if ((r = sshbuf_put(c->extended, errmsg,
801: strlen(errmsg))) != 0)
1.354 djm 802: fatal_fr(r, "sshbuf_put");
1.234 djm 803: } else
1.190 djm 804: error("%s", errmsg);
1.234 djm 805: if (cr->action == CONFIRM_TTY) {
806: /*
807: * If a TTY allocation error occurred, then arrange
808: * for the correct TTY to leave raw mode.
809: */
810: if (c->self == session_ident)
811: leave_raw_mode(0);
812: else
1.303 djm 813: mux_tty_alloc_failed(ssh, c);
1.234 djm 814: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 815: chan_read_failed(ssh, c);
816: chan_write_failed(ssh, c);
1.190 djm 817: }
818: }
1.250 djm 819: free(cr);
1.190 djm 820: }
821:
822: static void
1.303 djm 823: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 824: {
1.250 djm 825: free(ctx);
1.190 djm 826: }
1.129 deraadt 827:
1.236 djm 828: void
1.303 djm 829: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 830: enum confirm_action action)
1.190 djm 831: {
1.255 djm 832: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 833:
1.190 djm 834: cr->request_type = request;
1.234 djm 835: cr->action = action;
1.123 djm 836:
1.303 djm 837: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 838: client_abandon_status_confirm, cr);
1.196 djm 839: }
840:
841: void
842: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
843: {
1.201 djm 844: struct global_confirm *gc, *last_gc;
1.196 djm 845:
846: /* Coalesce identical callbacks */
1.201 djm 847: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
848: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
849: if (++last_gc->ref_count >= INT_MAX)
1.354 djm 850: fatal_f("last_gc->ref_count = %d",
851: last_gc->ref_count);
1.196 djm 852: return;
853: }
854:
1.255 djm 855: gc = xcalloc(1, sizeof(*gc));
1.196 djm 856: gc->cb = cb;
857: gc->ctx = ctx;
858: gc->ref_count = 1;
859: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 860: }
861:
1.384 djm 862: /*
863: * Returns non-zero if the client is able to handle a hostkeys-00@openssh.com
864: * hostkey update request.
865: */
866: static int
867: can_update_hostkeys(void)
868: {
869: if (hostkeys_update_complete)
870: return 0;
871: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
872: options.batch_mode)
873: return 0; /* won't ask in batchmode, so don't even try */
874: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
875: return 0;
876: return 1;
877: }
878:
1.385 dtucker 879: static void
880: client_repledge(void)
1.384 djm 881: {
882: debug3_f("enter");
883:
884: /* Might be able to tighten pledge now that session is established */
885: if (options.control_master || options.control_path != NULL ||
886: options.forward_x11 || options.fork_after_authentication ||
887: can_update_hostkeys() ||
888: (session_ident != -1 && !session_setup_complete)) {
889: /* Can't tighten */
890: return;
891: }
892: /*
893: * LocalCommand and UpdateHostkeys have finished, so can get rid of
894: * filesystem.
895: *
896: * XXX protocol allows a server can to change hostkeys during the
897: * connection at rekey time that could trigger a hostkeys update
898: * but AFAIK no implementations support this. Could improve by
899: * forcing known_hosts to be read-only or via unveil(2).
900: */
901: if (options.num_local_forwards != 0 ||
902: options.num_remote_forwards != 0 ||
903: options.num_permitted_remote_opens != 0 ||
904: options.enable_escape_commandline != 0) {
905: /* rfwd needs inet */
906: debug("pledge: network");
907: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
908: fatal_f("pledge(): %s", strerror(errno));
909: } else if (options.forward_agent != 0) {
910: /* agent forwarding needs to open $SSH_AUTH_SOCK at will */
911: debug("pledge: agent");
912: if (pledge("stdio unix proc tty", NULL) == -1)
913: fatal_f("pledge(): %s", strerror(errno));
914: } else {
915: debug("pledge: fork");
916: if (pledge("stdio proc tty", NULL) == -1)
917: fatal_f("pledge(): %s", strerror(errno));
918: }
919: /* XXX further things to do:
920: *
921: * - might be able to get rid of proc if we kill ~^Z
922: * - ssh -N (no session)
923: * - stdio forwarding
924: * - sessions without tty
925: */
926: }
927:
1.123 djm 928: static void
1.303 djm 929: process_cmdline(struct ssh *ssh)
1.97 jakob 930: {
931: void (*handler)(int);
1.261 millert 932: char *s, *cmd;
933: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
934: struct Forward fwd;
1.97 jakob 935:
1.257 tedu 936: memset(&fwd, 0, sizeof(fwd));
1.183 djm 937:
1.233 djm 938: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.332 dtucker 939: handler = ssh_signal(SIGINT, SIG_IGN);
1.99 markus 940: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 941: if (s == NULL)
942: goto out;
1.256 deraadt 943: while (isspace((u_char)*s))
1.97 jakob 944: s++;
1.121 djm 945: if (*s == '-')
946: s++; /* Skip cmdline '-', if any */
1.120 dtucker 947: if (*s == '\0')
1.97 jakob 948: goto out;
1.121 djm 949:
1.122 djm 950: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 951: logit("Commands:");
1.164 djm 952: logit(" -L[bind_address:]port:host:hostport "
953: "Request local forward");
954: logit(" -R[bind_address:]port:host:hostport "
955: "Request remote forward");
1.204 stevesk 956: logit(" -D[bind_address:]port "
957: "Request dynamic forward");
1.237 markus 958: logit(" -KL[bind_address:]port "
959: "Cancel local forward");
1.165 stevesk 960: logit(" -KR[bind_address:]port "
1.164 djm 961: "Cancel remote forward");
1.237 markus 962: logit(" -KD[bind_address:]port "
963: "Cancel dynamic forward");
1.146 reyk 964: if (!options.permit_local_command)
965: goto out;
1.164 djm 966: logit(" !args "
967: "Execute local command");
1.146 reyk 968: goto out;
969: }
970:
971: if (*s == '!' && options.permit_local_command) {
972: s++;
973: ssh_local_cmd(s);
1.121 djm 974: goto out;
975: }
976:
977: if (*s == 'K') {
978: delete = 1;
979: s++;
980: }
1.204 stevesk 981: if (*s == 'L')
982: local = 1;
983: else if (*s == 'R')
984: remote = 1;
985: else if (*s == 'D')
986: dynamic = 1;
987: else {
1.109 itojun 988: logit("Invalid command.");
1.97 jakob 989: goto out;
990: }
1.204 stevesk 991:
1.256 deraadt 992: while (isspace((u_char)*++s))
1.179 tedu 993: ;
1.97 jakob 994:
1.217 djm 995: /* XXX update list of forwards in options */
1.121 djm 996: if (delete) {
1.261 millert 997: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
998: if (!parse_forward(&fwd, s, 1, 0)) {
999: logit("Bad forwarding close specification.");
1.121 djm 1000: goto out;
1001: }
1.237 markus 1002: if (remote)
1.303 djm 1003: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 1004: else if (dynamic)
1.303 djm 1005: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 1006: 0, &options.fwd_opts) > 0;
1.237 markus 1007: else
1.303 djm 1008: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 1009: CHANNEL_CANCEL_PORT_STATIC,
1010: &options.fwd_opts) > 0;
1.237 markus 1011: if (!ok) {
1.290 dtucker 1012: logit("Unknown port forwarding.");
1.237 markus 1013: goto out;
1014: }
1015: logit("Canceled forwarding.");
1.121 djm 1016: } else {
1.382 dtucker 1017: /* -R specs can be both dynamic or not, so check both. */
1018: if (remote) {
1019: if (!parse_forward(&fwd, s, 0, remote) &&
1020: !parse_forward(&fwd, s, 1, remote)) {
1021: logit("Bad remote forwarding specification.");
1022: goto out;
1023: }
1024: } else if (!parse_forward(&fwd, s, dynamic, remote)) {
1025: logit("Bad local forwarding specification.");
1.121 djm 1026: goto out;
1027: }
1.204 stevesk 1028: if (local || dynamic) {
1.303 djm 1029: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 1030: &options.fwd_opts)) {
1.121 djm 1031: logit("Port forwarding failed.");
1032: goto out;
1033: }
1.135 djm 1034: } else {
1.303 djm 1035: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 1036: logit("Port forwarding failed.");
1037: goto out;
1038: }
1.135 djm 1039: }
1.121 djm 1040: logit("Forwarding port.");
1041: }
1042:
1.97 jakob 1043: out:
1.332 dtucker 1044: ssh_signal(SIGINT, handler);
1.233 djm 1045: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 1046: free(cmd);
1047: free(fwd.listen_host);
1.261 millert 1048: free(fwd.listen_path);
1.250 djm 1049: free(fwd.connect_host);
1.261 millert 1050: free(fwd.connect_path);
1.97 jakob 1051: }
1052:
1.244 dtucker 1053: /* reasons to suppress output of an escape command in help output */
1054: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 1055: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
1056: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
1057: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.383 djm 1058: #define SUPPRESS_NOCMDLINE 8 /* don't show when cmdline disabled*/
1.244 dtucker 1059: struct escape_help_text {
1060: const char *cmd;
1061: const char *text;
1062: unsigned int flags;
1063: };
1064: static struct escape_help_text esc_txt[] = {
1065: {".", "terminate session", SUPPRESS_MUXMASTER},
1066: {".", "terminate connection (and any multiplexed sessions)",
1067: SUPPRESS_MUXCLIENT},
1.292 djm 1068: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.383 djm 1069: {"C", "open a command line", SUPPRESS_MUXCLIENT|SUPPRESS_NOCMDLINE},
1.292 djm 1070: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 1071: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 1072: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
1073: {"#", "list forwarded connections", SUPPRESS_NEVER},
1074: {"&", "background ssh (when waiting for connections to terminate)",
1075: SUPPRESS_MUXCLIENT},
1076: {"?", "this message", SUPPRESS_NEVER},
1077: };
1078:
1079: static void
1.315 markus 1080: print_escape_help(struct sshbuf *b, int escape_char, int mux_client,
1081: int using_stderr)
1.244 dtucker 1082: {
1083: unsigned int i, suppress_flags;
1.315 markus 1084: int r;
1.244 dtucker 1085:
1.315 markus 1086: if ((r = sshbuf_putf(b,
1087: "%c?\r\nSupported escape sequences:\r\n", escape_char)) != 0)
1.354 djm 1088: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 1089:
1.292 djm 1090: suppress_flags =
1.244 dtucker 1091: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
1092: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
1.383 djm 1093: (using_stderr ? 0 : SUPPRESS_SYSLOG) |
1094: (options.enable_escape_commandline == 0 ? SUPPRESS_NOCMDLINE : 0);
1.244 dtucker 1095:
1096: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
1097: if (esc_txt[i].flags & suppress_flags)
1098: continue;
1.315 markus 1099: if ((r = sshbuf_putf(b, " %c%-3s - %s\r\n",
1100: escape_char, esc_txt[i].cmd, esc_txt[i].text)) != 0)
1.354 djm 1101: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 1102: }
1103:
1.315 markus 1104: if ((r = sshbuf_putf(b,
1.246 dtucker 1105: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 1106: "(Note that escapes are only recognized immediately after "
1.315 markus 1107: "newline.)\r\n", escape_char, escape_char)) != 0)
1.354 djm 1108: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 1109: }
1110:
1.314 djm 1111: /*
1.296 naddy 1112: * Process the characters one by one.
1.195 djm 1113: */
1.77 itojun 1114: static int
1.303 djm 1115: process_escapes(struct ssh *ssh, Channel *c,
1.315 markus 1116: struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr,
1.195 djm 1117: char *buf, int len)
1.31 markus 1118: {
1119: pid_t pid;
1.315 markus 1120: int r, bytes = 0;
1.42 markus 1121: u_int i;
1122: u_char ch;
1.31 markus 1123: char *s;
1.392 dtucker 1124: struct escape_filter_ctx *efc;
1.31 markus 1125:
1.392 dtucker 1126: if (c == NULL || c->filter_ctx == NULL || len <= 0)
1.294 djm 1127: return 0;
1.314 djm 1128:
1.392 dtucker 1129: efc = (struct escape_filter_ctx *)c->filter_ctx;
1.139 djm 1130:
1131: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1132: /* Get one character at a time. */
1133: ch = buf[i];
1134:
1.294 djm 1135: if (efc->escape_pending) {
1.31 markus 1136: /* We have previously seen an escape character. */
1137: /* Clear the flag now. */
1.294 djm 1138: efc->escape_pending = 0;
1.31 markus 1139:
1140: /* Process the escaped character. */
1141: switch (ch) {
1142: case '.':
1143: /* Terminate the connection. */
1.315 markus 1144: if ((r = sshbuf_putf(berr, "%c.\r\n",
1145: efc->escape_char)) != 0)
1.354 djm 1146: fatal_fr(r, "sshbuf_putf");
1.217 djm 1147: if (c && c->ctl_chan != -1) {
1.387 djm 1148: channel_force_close(ssh, c, 1);
1.195 djm 1149: return 0;
1150: } else
1151: quit_pending = 1;
1.31 markus 1152: return -1;
1153:
1154: case 'Z' - 64:
1.195 djm 1155: /* XXX support this for mux clients */
1.217 djm 1156: if (c && c->ctl_chan != -1) {
1.245 dtucker 1157: char b[16];
1.195 djm 1158: noescape:
1.245 dtucker 1159: if (ch == 'Z' - 64)
1160: snprintf(b, sizeof b, "^Z");
1161: else
1162: snprintf(b, sizeof b, "%c", ch);
1.315 markus 1163: if ((r = sshbuf_putf(berr,
1.245 dtucker 1164: "%c%s escape not available to "
1.195 djm 1165: "multiplexed sessions\r\n",
1.315 markus 1166: efc->escape_char, b)) != 0)
1.354 djm 1167: fatal_fr(r, "sshbuf_putf");
1.195 djm 1168: continue;
1169: }
1.197 djm 1170: /* Suspend the program. Inform the user */
1.315 markus 1171: if ((r = sshbuf_putf(berr,
1172: "%c^Z [suspend ssh]\r\n",
1173: efc->escape_char)) != 0)
1.354 djm 1174: fatal_fr(r, "sshbuf_putf");
1.31 markus 1175:
1176: /* Restore terminal modes and suspend. */
1177: client_suspend_self(bin, bout, berr);
1178:
1179: /* We have been continued. */
1180: continue;
1181:
1.111 markus 1182: case 'B':
1.315 markus 1183: if ((r = sshbuf_putf(berr,
1184: "%cB\r\n", efc->escape_char)) != 0)
1.354 djm 1185: fatal_fr(r, "sshbuf_putf");
1.303 djm 1186: channel_request_start(ssh, c->self, "break", 0);
1.315 markus 1187: if ((r = sshpkt_put_u32(ssh, 1000)) != 0 ||
1188: (r = sshpkt_send(ssh)) != 0)
1.354 djm 1189: fatal_fr(r, "send packet");
1.111 markus 1190: continue;
1191:
1.54 markus 1192: case 'R':
1.357 djm 1193: if (ssh->compat & SSH_BUG_NOREKEY)
1.292 djm 1194: logit("Server does not "
1195: "support re-keying");
1196: else
1197: need_rekeying = 1;
1.54 markus 1198: continue;
1199:
1.242 dtucker 1200: case 'V':
1201: /* FALLTHROUGH */
1202: case 'v':
1203: if (c && c->ctl_chan != -1)
1204: goto noescape;
1205: if (!log_is_on_stderr()) {
1.315 markus 1206: if ((r = sshbuf_putf(berr,
1.242 dtucker 1207: "%c%c [Logging to syslog]\r\n",
1.315 markus 1208: efc->escape_char, ch)) != 0)
1.354 djm 1209: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1210: continue;
1211: }
1212: if (ch == 'V' && options.log_level >
1213: SYSLOG_LEVEL_QUIET)
1214: log_change_level(--options.log_level);
1215: if (ch == 'v' && options.log_level <
1216: SYSLOG_LEVEL_DEBUG3)
1217: log_change_level(++options.log_level);
1.315 markus 1218: if ((r = sshbuf_putf(berr,
1.294 djm 1219: "%c%c [LogLevel %s]\r\n",
1220: efc->escape_char, ch,
1.315 markus 1221: log_level_name(options.log_level))) != 0)
1.354 djm 1222: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1223: continue;
1224:
1.31 markus 1225: case '&':
1.392 dtucker 1226: if (c->ctl_chan != -1)
1.195 djm 1227: goto noescape;
1.31 markus 1228: /*
1.197 djm 1229: * Detach the program (continue to serve
1230: * connections, but put in background and no
1231: * more new connections).
1.31 markus 1232: */
1233: /* Restore tty modes. */
1.233 djm 1234: leave_raw_mode(
1235: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1236:
1237: /* Stop listening for new connections. */
1.303 djm 1238: channel_stop_listening(ssh);
1.31 markus 1239:
1.354 djm 1240: if ((r = sshbuf_putf(berr, "%c& "
1241: "[backgrounded]\n", efc->escape_char)) != 0)
1242: fatal_fr(r, "sshbuf_putf");
1.31 markus 1243:
1244: /* Fork into background. */
1245: pid = fork();
1.326 deraadt 1246: if (pid == -1) {
1.31 markus 1247: error("fork: %.100s", strerror(errno));
1248: continue;
1249: }
1250: if (pid != 0) { /* This is the parent. */
1251: /* The parent just exits. */
1252: exit(0);
1253: }
1254: /* The child continues serving connections. */
1.292 djm 1255: /* fake EOF on stdin */
1.315 markus 1256: if ((r = sshbuf_put_u8(bin, 4)) != 0)
1.354 djm 1257: fatal_fr(r, "sshbuf_put_u8");
1.292 djm 1258: return -1;
1.31 markus 1259: case '?':
1.294 djm 1260: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1261: (c && c->ctl_chan != -1),
1262: log_is_on_stderr());
1.31 markus 1263: continue;
1264:
1265: case '#':
1.315 markus 1266: if ((r = sshbuf_putf(berr, "%c#\r\n",
1267: efc->escape_char)) != 0)
1.354 djm 1268: fatal_fr(r, "sshbuf_putf");
1.303 djm 1269: s = channel_open_message(ssh);
1.315 markus 1270: if ((r = sshbuf_put(berr, s, strlen(s))) != 0)
1.354 djm 1271: fatal_fr(r, "sshbuf_put");
1.250 djm 1272: free(s);
1.97 jakob 1273: continue;
1274:
1275: case 'C':
1.217 djm 1276: if (c && c->ctl_chan != -1)
1.206 djm 1277: goto noescape;
1.383 djm 1278: if (options.enable_escape_commandline == 0) {
1279: if ((r = sshbuf_putf(berr,
1280: "commandline disabled\r\n")) != 0)
1281: fatal_fr(r, "sshbuf_putf");
1282: continue;
1283: }
1.303 djm 1284: process_cmdline(ssh);
1.31 markus 1285: continue;
1286:
1287: default:
1.294 djm 1288: if (ch != efc->escape_char) {
1.315 markus 1289: if ((r = sshbuf_put_u8(bin,
1290: efc->escape_char)) != 0)
1.354 djm 1291: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1292: bytes++;
1293: }
1294: /* Escaped characters fall through here */
1295: break;
1296: }
1297: } else {
1298: /*
1.197 djm 1299: * The previous character was not an escape char.
1300: * Check if this is an escape.
1.31 markus 1301: */
1.294 djm 1302: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1303: /*
1304: * It is. Set the flag and continue to
1305: * next character.
1306: */
1.294 djm 1307: efc->escape_pending = 1;
1.31 markus 1308: continue;
1309: }
1310: }
1311:
1312: /*
1313: * Normal character. Record whether it was a newline,
1314: * and append it to the buffer.
1315: */
1316: last_was_cr = (ch == '\r' || ch == '\n');
1.315 markus 1317: if ((r = sshbuf_put_u8(bin, ch)) != 0)
1.354 djm 1318: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1319: bytes++;
1320: }
1321: return bytes;
1322: }
1323:
1.13 markus 1324: /*
1.15 markus 1325: * Get packets from the connection input buffer, and process them as long as
1326: * there are packets available.
1327: *
1328: * Any unknown packets received during the actual
1329: * session cause the session to terminate. This is
1330: * intended to make debugging easier since no
1331: * confirmations are sent. Any compatible protocol
1332: * extensions must be negotiated during the
1333: * preparatory phase.
1334: */
1335:
1.77 itojun 1336: static void
1.321 djm 1337: client_process_buffered_input_packets(struct ssh *ssh)
1.15 markus 1338: {
1.321 djm 1339: ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1340: }
1341:
1.31 markus 1342: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1343:
1.195 djm 1344: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1345: void *
1346: client_new_escape_filter_ctx(int escape_char)
1347: {
1348: struct escape_filter_ctx *ret;
1349:
1.255 djm 1350: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1351: ret->escape_pending = 0;
1352: ret->escape_char = escape_char;
1353: return (void *)ret;
1354: }
1355:
1.198 djm 1356: /* Free the escape filter context on channel free */
1357: void
1.303 djm 1358: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1359: {
1.250 djm 1360: free(ctx);
1.198 djm 1361: }
1362:
1.195 djm 1363: int
1.303 djm 1364: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1365: {
1.190 djm 1366: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1367: return 0;
1368:
1.303 djm 1369: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1370: buf, len);
1.30 markus 1371: }
1372:
1.77 itojun 1373: static void
1.387 djm 1374: client_channel_closed(struct ssh *ssh, int id, int force, void *arg)
1.60 markus 1375: {
1.303 djm 1376: channel_cancel_cleanup(ssh, id);
1.60 markus 1377: session_closed = 1;
1.233 djm 1378: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1379: }
1380:
1.15 markus 1381: /*
1.13 markus 1382: * Implements the interactive session with the server. This is called after
1383: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1384: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1385: * used as an escape character for terminating or suspending the session.
1.13 markus 1386: */
1.20 markus 1387: int
1.303 djm 1388: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1389: int ssh2_chan_id)
1.1 deraadt 1390: {
1.374 djm 1391: struct pollfd *pfd = NULL;
1392: u_int npfd_alloc = 0, npfd_active = 0;
1.11 markus 1393: double start_time, total_time;
1.374 djm 1394: int r, len;
1.200 markus 1395: u_int64_t ibytes, obytes;
1.374 djm 1396: int conn_in_ready, conn_out_ready;
1.11 markus 1397:
1398: debug("Entering interactive session.");
1.384 djm 1399: session_ident = ssh2_chan_id;
1.277 semarie 1400:
1.278 semarie 1401: if (options.control_master &&
1.286 djm 1402: !option_clear_or_none(options.control_path)) {
1.278 semarie 1403: debug("pledge: id");
1.327 mestre 1404: if (pledge("stdio rpath wpath cpath unix inet dns recvfd sendfd proc exec id tty",
1.278 semarie 1405: NULL) == -1)
1.354 djm 1406: fatal_f("pledge(): %s", strerror(errno));
1.278 semarie 1407:
1408: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1409: debug("pledge: exec");
1410: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1411: NULL) == -1)
1.354 djm 1412: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1413:
1414: } else if (options.update_hostkeys) {
1.373 jsg 1415: debug("pledge: filesystem");
1.277 semarie 1416: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1417: NULL) == -1)
1.354 djm 1418: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1419:
1.286 djm 1420: } else if (!option_clear_or_none(options.proxy_command) ||
1.369 djm 1421: options.fork_after_authentication) {
1.277 semarie 1422: debug("pledge: proc");
1423: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1.354 djm 1424: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1425:
1426: } else {
1427: debug("pledge: network");
1.300 mestre 1428: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.354 djm 1429: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1430: }
1.11 markus 1431:
1.384 djm 1432: /* might be able to tighten now */
1433: client_repledge();
1434:
1.307 dtucker 1435: start_time = monotime_double();
1.11 markus 1436:
1437: /* Initialize variables. */
1438: last_was_cr = 1;
1439: exit_status = -1;
1.320 djm 1440: connection_in = ssh_packet_get_connection_in(ssh);
1441: connection_out = ssh_packet_get_connection_out(ssh);
1.46 markus 1442:
1.11 markus 1443: quit_pending = 0;
1444:
1.315 markus 1445: /* Initialize buffer. */
1446: if ((stderr_buffer = sshbuf_new()) == NULL)
1.354 djm 1447: fatal_f("sshbuf_new failed");
1.11 markus 1448:
1.321 djm 1449: client_init_dispatch(ssh);
1.15 markus 1450:
1.105 markus 1451: /*
1452: * Set signal handlers, (e.g. to restore non-blocking mode)
1453: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1454: */
1.332 dtucker 1455: if (ssh_signal(SIGHUP, SIG_IGN) != SIG_IGN)
1456: ssh_signal(SIGHUP, signal_handler);
1457: if (ssh_signal(SIGINT, SIG_IGN) != SIG_IGN)
1458: ssh_signal(SIGINT, signal_handler);
1459: if (ssh_signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1460: ssh_signal(SIGQUIT, signal_handler);
1461: if (ssh_signal(SIGTERM, SIG_IGN) != SIG_IGN)
1462: ssh_signal(SIGTERM, signal_handler);
1463: ssh_signal(SIGWINCH, window_change_handler);
1.11 markus 1464:
1465: if (have_pty)
1.233 djm 1466: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1467:
1.292 djm 1468: if (session_ident != -1) {
1469: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1470: channel_register_filter(ssh, session_ident,
1.292 djm 1471: client_simple_escape_filter, NULL,
1472: client_filter_cleanup,
1473: client_new_escape_filter_ctx(
1474: escape_char_arg));
1.232 djm 1475: }
1.303 djm 1476: channel_register_cleanup(ssh, session_ident,
1.292 djm 1477: client_channel_closed, 0);
1.48 markus 1478: }
1.345 dtucker 1479:
1480: schedule_server_alive_check();
1.30 markus 1481:
1.11 markus 1482: /* Main loop of the client for the interactive session mode. */
1483: while (!quit_pending) {
1484:
1.13 markus 1485: /* Process buffered packets sent by the server. */
1.321 djm 1486: client_process_buffered_input_packets(ssh);
1.11 markus 1487:
1.303 djm 1488: if (session_closed && !channel_still_open(ssh))
1.60 markus 1489: break;
1490:
1.303 djm 1491: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1492: debug("rekeying in progress");
1.284 djm 1493: } else if (need_rekeying) {
1494: /* manual rekey request */
1495: debug("need rekeying");
1.303 djm 1496: if ((r = kex_start_rekex(ssh)) != 0)
1.354 djm 1497: fatal_fr(r, "kex_start_rekex");
1.284 djm 1498: need_rekeying = 0;
1.56 markus 1499: } else {
1500: /*
1501: * Make packets from buffered channel data, and
1502: * enqueue them for sending to the server.
1503: */
1.320 djm 1504: if (ssh_packet_not_very_much_data_to_write(ssh))
1.303 djm 1505: channel_output_poll(ssh);
1.11 markus 1506:
1.56 markus 1507: /*
1508: * Check if the window size has changed, and buffer a
1509: * message about it to the server if so.
1510: */
1.303 djm 1511: client_check_window_change(ssh);
1.11 markus 1512:
1.56 markus 1513: if (quit_pending)
1514: break;
1515: }
1.13 markus 1516: /*
1517: * Wait until we have something to do (something becomes
1518: * available on one of the descriptors).
1519: */
1.374 djm 1520: client_wait_until_can_do_something(ssh, &pfd, &npfd_alloc,
1521: &npfd_active, ssh_packet_is_rekeying(ssh),
1522: &conn_in_ready, &conn_out_ready);
1.11 markus 1523:
1524: if (quit_pending)
1525: break;
1526:
1.379 djm 1527: /* Do channel operations. */
1528: channel_after_poll(ssh, pfd, npfd_active);
1.11 markus 1529:
1.17 markus 1530: /* Buffer input from the connection. */
1.374 djm 1531: if (conn_in_ready)
1532: client_process_net_input(ssh);
1.17 markus 1533:
1534: if (quit_pending)
1535: break;
1.367 djm 1536:
1537: /* A timeout may have triggered rekeying */
1538: if ((r = ssh_packet_check_rekey(ssh)) != 0)
1539: fatal_fr(r, "cannot start rekeying");
1.11 markus 1540:
1.197 djm 1541: /*
1542: * Send as much buffered packet data as possible to the
1543: * sender.
1544: */
1.374 djm 1545: if (conn_out_ready) {
1.338 djm 1546: if ((r = ssh_packet_write_poll(ssh)) != 0) {
1547: sshpkt_fatal(ssh, r,
1548: "%s: ssh_packet_write_poll", __func__);
1549: }
1550: }
1.222 djm 1551:
1552: /*
1553: * If we are a backgrounded control master, and the
1554: * timeout has expired without any active client
1555: * connections, then quit.
1556: */
1557: if (control_persist_exit_time > 0) {
1.251 dtucker 1558: if (monotime() >= control_persist_exit_time) {
1.222 djm 1559: debug("ControlPersist timeout expired");
1560: break;
1561: }
1562: }
1.11 markus 1563: }
1.374 djm 1564: free(pfd);
1.11 markus 1565:
1566: /* Terminate the session. */
1567:
1568: /* Stop watching for window change. */
1.332 dtucker 1569: ssh_signal(SIGWINCH, SIG_DFL);
1.211 andreas 1570:
1.320 djm 1571: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
1572: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_BY_APPLICATION)) != 0 ||
1573: (r = sshpkt_put_cstring(ssh, "disconnected by user")) != 0 ||
1574: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language tag */
1575: (r = sshpkt_send(ssh)) != 0 ||
1576: (r = ssh_packet_write_wait(ssh)) != 0)
1.354 djm 1577: fatal_fr(r, "send disconnect");
1.11 markus 1578:
1.303 djm 1579: channel_free_all(ssh);
1.11 markus 1580:
1.75 markus 1581: if (have_pty)
1.233 djm 1582: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.116 dtucker 1583:
1584: /*
1585: * If there was no shell or command requested, there will be no remote
1586: * exit status to be returned. In that case, clear error code if the
1587: * connection was deliberately terminated at this end.
1588: */
1.370 djm 1589: if (options.session_type == SESSION_TYPE_NONE &&
1590: received_signal == SIGTERM) {
1.116 dtucker 1591: received_signal = 0;
1592: exit_status = 0;
1593: }
1.75 markus 1594:
1.301 dtucker 1595: if (received_signal) {
1596: verbose("Killed by signal %d.", (int) received_signal);
1.359 djm 1597: cleanup_exit(255);
1.301 dtucker 1598: }
1.75 markus 1599:
1.13 markus 1600: /*
1601: * In interactive mode (with pseudo tty) display a message indicating
1602: * that the connection has been closed.
1603: */
1.377 djm 1604: if (have_pty && options.log_level >= SYSLOG_LEVEL_INFO)
1605: quit_message("Connection to %s closed.", host);
1.70 markus 1606:
1.11 markus 1607: /* Output any buffered data for stderr. */
1.315 markus 1608: if (sshbuf_len(stderr_buffer) > 0) {
1.230 djm 1609: len = atomicio(vwrite, fileno(stderr),
1.315 markus 1610: (u_char *)sshbuf_ptr(stderr_buffer),
1611: sshbuf_len(stderr_buffer));
1612: if (len < 0 || (u_int)len != sshbuf_len(stderr_buffer))
1.11 markus 1613: error("Write failed flushing stderr buffer.");
1.315 markus 1614: else if ((r = sshbuf_consume(stderr_buffer, len)) != 0)
1.354 djm 1615: fatal_fr(r, "sshbuf_consume");
1.11 markus 1616: }
1617:
1618: /* Clear and free any buffers. */
1.315 markus 1619: sshbuf_free(stderr_buffer);
1.11 markus 1620:
1621: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1622: total_time = monotime_double() - start_time;
1.320 djm 1623: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.200 markus 1624: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1625: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1626: if (total_time > 0)
1.200 markus 1627: verbose("Bytes per second: sent %.1f, received %.1f",
1628: obytes / total_time, ibytes / total_time);
1.11 markus 1629: /* Return the exit status of the program. */
1630: debug("Exit status %d", exit_status);
1631: return exit_status;
1.15 markus 1632: }
1633:
1634: /*********/
1635:
1.77 itojun 1636: static Channel *
1.303 djm 1637: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1638: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1639: {
1.103 deraadt 1640: Channel *c = NULL;
1.289 markus 1641: struct sshbuf *b = NULL;
1.40 markus 1642: char *listen_address, *originator_address;
1.320 djm 1643: u_int listen_port, originator_port;
1.289 markus 1644: int r;
1.40 markus 1645:
1646: /* Get rest of the packet */
1.320 djm 1647: if ((r = sshpkt_get_cstring(ssh, &listen_address, NULL)) != 0 ||
1648: (r = sshpkt_get_u32(ssh, &listen_port)) != 0 ||
1649: (r = sshpkt_get_cstring(ssh, &originator_address, NULL)) != 0 ||
1650: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1651: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1652: fatal_fr(r, "parse packet");
1.40 markus 1653:
1.354 djm 1654: debug_f("listen %s port %d, originator %s port %d",
1.261 millert 1655: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1656:
1.320 djm 1657: if (listen_port > 0xffff)
1.354 djm 1658: error_f("invalid listen port");
1.320 djm 1659: else if (originator_port > 0xffff)
1.354 djm 1660: error_f("invalid originator port");
1.320 djm 1661: else {
1662: c = channel_connect_by_listen_address(ssh,
1663: listen_address, listen_port, "forwarded-tcpip",
1664: originator_address);
1665: }
1.40 markus 1666:
1.289 markus 1667: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1668: if ((b = sshbuf_new()) == NULL) {
1.354 djm 1669: error_f("alloc reply");
1.289 markus 1670: goto out;
1671: }
1672: /* reconstruct and send to muxclient */
1673: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1674: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1675: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1676: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1677: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1678: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1679: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1680: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1681: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1682: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1683: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.354 djm 1684: error_fr(r, "compose for muxclient");
1.289 markus 1685: goto out;
1686: }
1687: }
1688:
1689: out:
1690: sshbuf_free(b);
1.250 djm 1691: free(originator_address);
1692: free(listen_address);
1.40 markus 1693: return c;
1694: }
1695:
1.103 deraadt 1696: static Channel *
1.303 djm 1697: client_request_forwarded_streamlocal(struct ssh *ssh,
1698: const char *request_type, int rchan)
1.261 millert 1699: {
1700: Channel *c = NULL;
1701: char *listen_path;
1.320 djm 1702: int r;
1.261 millert 1703:
1704: /* Get the remote path. */
1.320 djm 1705: if ((r = sshpkt_get_cstring(ssh, &listen_path, NULL)) != 0 ||
1706: (r = sshpkt_get_string(ssh, NULL, NULL)) != 0 || /* reserved */
1707: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1708: fatal_fr(r, "parse packet");
1.261 millert 1709:
1.354 djm 1710: debug_f("request: %s", listen_path);
1.261 millert 1711:
1.303 djm 1712: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1713: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1714: free(listen_path);
1715: return c;
1716: }
1717:
1718: static Channel *
1.303 djm 1719: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1720: {
1721: Channel *c = NULL;
1722: char *originator;
1.321 djm 1723: u_int originator_port;
1.320 djm 1724: int r, sock;
1.40 markus 1725:
1726: if (!options.forward_x11) {
1727: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1728: error("Warning: this is probably a break-in attempt by a "
1729: "malicious server.");
1.221 djm 1730: return NULL;
1731: }
1.388 dtucker 1732: if (x11_refuse_time != 0 && monotime() >= x11_refuse_time) {
1.221 djm 1733: verbose("Rejected X11 connection after ForwardX11Timeout "
1734: "expired");
1.40 markus 1735: return NULL;
1736: }
1.320 djm 1737: if ((r = sshpkt_get_cstring(ssh, &originator, NULL)) != 0 ||
1.321 djm 1738: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1.320 djm 1739: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1740: fatal_fr(r, "parse packet");
1.40 markus 1741: /* XXX check permission */
1.321 djm 1742: /* XXX range check originator port? */
1743: debug("client_request_x11: request from %s %u", originator,
1.47 markus 1744: originator_port);
1.250 djm 1745: free(originator);
1.303 djm 1746: sock = x11_connect_display(ssh);
1.67 markus 1747: if (sock < 0)
1748: return NULL;
1.303 djm 1749: c = channel_new(ssh, "x11",
1.67 markus 1750: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1751: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1752: c->force_drain = 1;
1.40 markus 1753: return c;
1754: }
1755:
1.103 deraadt 1756: static Channel *
1.303 djm 1757: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1758: {
1759: Channel *c = NULL;
1.262 djm 1760: int r, sock;
1.40 markus 1761:
1762: if (!options.forward_agent) {
1763: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1764: error("Warning: this is probably a break-in attempt by a "
1765: "malicious server.");
1.40 markus 1766: return NULL;
1767: }
1.330 djm 1768: if (forward_agent_sock_path == NULL) {
1769: r = ssh_get_authentication_socket(&sock);
1770: } else {
1771: r = ssh_get_authentication_socket_path(forward_agent_sock_path, &sock);
1772: }
1773: if (r != 0) {
1.262 djm 1774: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.354 djm 1775: debug_fr(r, "ssh_get_authentication_socket");
1.67 markus 1776: return NULL;
1.262 djm 1777: }
1.372 djm 1778: if ((r = ssh_agent_bind_hostkey(sock, ssh->kex->initial_hostkey,
1779: ssh->kex->session_id, ssh->kex->initial_sig, 1)) == 0)
1780: debug_f("bound agent to hostkey");
1781: else
1782: debug2_fr(r, "ssh_agent_bind_hostkey");
1783:
1.303 djm 1784: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1785: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1786: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1787: "authentication agent connection", 1);
1.82 markus 1788: c->force_drain = 1;
1.40 markus 1789: return c;
1.180 djm 1790: }
1791:
1.306 djm 1792: char *
1.303 djm 1793: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1.343 djm 1794: int local_tun, int remote_tun, channel_open_fn *cb, void *cbctx)
1.180 djm 1795: {
1796: Channel *c;
1.320 djm 1797: int r, fd;
1.306 djm 1798: char *ifname = NULL;
1.180 djm 1799:
1800: if (tun_mode == SSH_TUNMODE_NO)
1801: return 0;
1802:
1803: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1804:
1805: /* Open local tunnel device */
1.306 djm 1806: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1807: error("Tunnel device open failed.");
1.306 djm 1808: return NULL;
1.180 djm 1809: }
1.306 djm 1810: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1811:
1.303 djm 1812: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1813: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1814: c->datagram = 1;
1.343 djm 1815:
1816: if (cb != NULL)
1817: channel_register_open_confirm(ssh, c->self, cb, cbctx);
1.180 djm 1818:
1.320 djm 1819: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1820: (r = sshpkt_put_cstring(ssh, "tun@openssh.com")) != 0 ||
1821: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1822: (r = sshpkt_put_u32(ssh, c->local_window_max)) != 0 ||
1823: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1824: (r = sshpkt_put_u32(ssh, tun_mode)) != 0 ||
1825: (r = sshpkt_put_u32(ssh, remote_tun)) != 0 ||
1826: (r = sshpkt_send(ssh)) != 0)
1.321 djm 1827: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.180 djm 1828:
1.306 djm 1829: return ifname;
1.40 markus 1830: }
1831:
1.22 markus 1832: /* XXXX move to generic input handler */
1.264 markus 1833: static int
1.297 markus 1834: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1835: {
1836: Channel *c = NULL;
1.320 djm 1837: char *ctype = NULL;
1838: int r;
1839: u_int rchan;
1840: size_t len;
1841: u_int rmaxpack, rwindow;
1842:
1843: if ((r = sshpkt_get_cstring(ssh, &ctype, &len)) != 0 ||
1844: (r = sshpkt_get_u32(ssh, &rchan)) != 0 ||
1845: (r = sshpkt_get_u32(ssh, &rwindow)) != 0 ||
1846: (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0)
1847: goto out;
1.22 markus 1848:
1.24 markus 1849: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1850: ctype, rchan, rwindow, rmaxpack);
1851:
1.40 markus 1852: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1853: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1854: rmaxpack);
1.261 millert 1855: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1856: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1857: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1858: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1859: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1860: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1861: }
1.289 markus 1862: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1863: debug3("proxied to downstream: %s", ctype);
1864: } else if (c != NULL) {
1.22 markus 1865: debug("confirm %s", ctype);
1866: c->remote_id = rchan;
1.304 djm 1867: c->have_remote_id = 1;
1.22 markus 1868: c->remote_window = rwindow;
1869: c->remote_maxpacket = rmaxpack;
1.69 markus 1870: if (c->type != SSH_CHANNEL_CONNECTING) {
1.320 djm 1871: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1872: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1873: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1874: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1875: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1876: (r = sshpkt_send(ssh)) != 0)
1877: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.69 markus 1878: }
1.22 markus 1879: } else {
1880: debug("failure %s", ctype);
1.320 djm 1881: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
1882: (r = sshpkt_put_u32(ssh, rchan)) != 0 ||
1883: (r = sshpkt_put_u32(ssh, SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED)) != 0 ||
1884: (r = sshpkt_put_cstring(ssh, "open failed")) != 0 ||
1885: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1886: (r = sshpkt_send(ssh)) != 0)
1887: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.22 markus 1888: }
1.320 djm 1889: r = 0;
1890: out:
1.250 djm 1891: free(ctype);
1.320 djm 1892: return r;
1.22 markus 1893: }
1.267 djm 1894:
1.264 markus 1895: static int
1.297 markus 1896: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1897: {
1898: Channel *c = NULL;
1.320 djm 1899: char *rtype = NULL;
1900: u_char reply;
1901: u_int id, exitval;
1902: int r, success = 0;
1903:
1904: if ((r = sshpkt_get_u32(ssh, &id)) != 0)
1905: return r;
1906: if (id <= INT_MAX)
1907: c = channel_lookup(ssh, id);
1.297 markus 1908: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1909: return 0;
1.320 djm 1910: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
1911: (r = sshpkt_get_u8(ssh, &reply)) != 0)
1912: goto out;
1.48 markus 1913:
1.320 djm 1914: debug("client_input_channel_req: channel %u rtype %s reply %d",
1.48 markus 1915: id, rtype, reply);
1916:
1.320 djm 1917: if (c == NULL) {
1.197 djm 1918: error("client_input_channel_req: channel %d: "
1919: "unknown channel", id);
1.193 markus 1920: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1.320 djm 1921: if ((r = sshpkt_get_end(ssh)) != 0)
1922: goto out;
1.303 djm 1923: chan_rcvd_eow(ssh, c);
1.48 markus 1924: } else if (strcmp(rtype, "exit-status") == 0) {
1.320 djm 1925: if ((r = sshpkt_get_u32(ssh, &exitval)) != 0)
1926: goto out;
1.217 djm 1927: if (c->ctl_chan != -1) {
1.303 djm 1928: mux_exit_message(ssh, c, exitval);
1.215 djm 1929: success = 1;
1.320 djm 1930: } else if ((int)id == session_ident) {
1.215 djm 1931: /* Record exit value of local session */
1.123 djm 1932: success = 1;
1933: exit_status = exitval;
1.215 djm 1934: } else {
1.218 djm 1935: /* Probably for a mux channel that has already closed */
1.354 djm 1936: debug_f("no sink for exit-status on channel %d",
1937: id);
1.123 djm 1938: }
1.320 djm 1939: if ((r = sshpkt_get_end(ssh)) != 0)
1940: goto out;
1.48 markus 1941: }
1.259 djm 1942: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1943: if (!c->have_remote_id)
1.354 djm 1944: fatal_f("channel %d: no remote_id", c->self);
1.320 djm 1945: if ((r = sshpkt_start(ssh, success ?
1946: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE)) != 0 ||
1947: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1948: (r = sshpkt_send(ssh)) != 0)
1949: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.48 markus 1950: }
1.320 djm 1951: r = 0;
1952: out:
1.250 djm 1953: free(rtype);
1.320 djm 1954: return r;
1.48 markus 1955: }
1.267 djm 1956:
1.269 djm 1957: struct hostkeys_update_ctx {
1958: /* The hostname and (optionally) IP address string for the server */
1959: char *host_str, *ip_str;
1960:
1961: /*
1962: * Keys received from the server and a flag for each indicating
1963: * whether they already exist in known_hosts.
1.351 djm 1964: * keys_match is filled in by hostkeys_find() and later (for new
1.381 djm 1965: * keys) by client_global_hostkeys_prove_confirm().
1.269 djm 1966: */
1967: struct sshkey **keys;
1.351 djm 1968: u_int *keys_match; /* mask of HKF_MATCH_* from hostfile.h */
1969: int *keys_verified; /* flag for new keys verified by server */
1970: size_t nkeys, nnew, nincomplete; /* total, new keys, incomplete match */
1.269 djm 1971:
1972: /*
1973: * Keys that are in known_hosts, but were not present in the update
1974: * from the server (i.e. scheduled to be deleted).
1975: * Filled in by hostkeys_find().
1976: */
1977: struct sshkey **old_keys;
1978: size_t nold;
1.347 djm 1979:
1980: /* Various special cases. */
1.350 djm 1981: int complex_hostspec; /* wildcard or manual pattern-list host name */
1.347 djm 1982: int ca_available; /* saw CA key for this host */
1.352 djm 1983: int old_key_seen; /* saw old key with other name/addr */
1.353 djm 1984: int other_name_seen; /* saw key with other name/addr */
1.269 djm 1985: };
1986:
1987: static void
1988: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1989: {
1990: size_t i;
1991:
1992: if (ctx == NULL)
1993: return;
1994: for (i = 0; i < ctx->nkeys; i++)
1995: sshkey_free(ctx->keys[i]);
1996: free(ctx->keys);
1.351 djm 1997: free(ctx->keys_match);
1998: free(ctx->keys_verified);
1.269 djm 1999: for (i = 0; i < ctx->nold; i++)
2000: sshkey_free(ctx->old_keys[i]);
2001: free(ctx->old_keys);
2002: free(ctx->host_str);
2003: free(ctx->ip_str);
2004: free(ctx);
2005: }
2006:
1.350 djm 2007: /*
2008: * Returns non-zero if a known_hosts hostname list is not of a form that
2009: * can be handled by UpdateHostkeys. These include wildcard hostnames and
2010: * hostnames lists that do not follow the form host[,ip].
2011: */
2012: static int
2013: hostspec_is_complex(const char *hosts)
2014: {
2015: char *cp;
2016:
2017: /* wildcard */
2018: if (strchr(hosts, '*') != NULL || strchr(hosts, '?') != NULL)
2019: return 1;
2020: /* single host/ip = ok */
2021: if ((cp = strchr(hosts, ',')) == NULL)
2022: return 0;
2023: /* more than two entries on the line */
2024: if (strchr(cp + 1, ',') != NULL)
2025: return 1;
2026: /* XXX maybe parse cp+1 and ensure it is an IP? */
2027: return 0;
2028: }
2029:
1.352 djm 2030: /* callback to search for ctx->keys in known_hosts */
1.269 djm 2031: static int
2032: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
2033: {
2034: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2035: size_t i;
2036: struct sshkey **tmp;
2037:
1.353 djm 2038: if (l->key == NULL)
1.269 djm 2039: return 0;
1.353 djm 2040: if (l->status != HKF_STATUS_MATCHED) {
2041: /* Record if one of the keys appears on a non-matching line */
2042: for (i = 0; i < ctx->nkeys; i++) {
2043: if (sshkey_equal(l->key, ctx->keys[i])) {
2044: ctx->other_name_seen = 1;
1.354 djm 2045: debug3_f("found %s key under different "
2046: "name/addr at %s:%ld",
1.353 djm 2047: sshkey_ssh_name(ctx->keys[i]),
2048: l->path, l->linenum);
2049: return 0;
2050: }
2051: }
2052: return 0;
2053: }
2054: /* Don't proceed if revocation or CA markers are present */
2055: /* XXX relax this */
2056: if (l->marker != MRK_NONE) {
1.354 djm 2057: debug3_f("hostkeys file %s:%ld has CA/revocation marker",
2058: l->path, l->linenum);
1.353 djm 2059: ctx->complex_hostspec = 1;
2060: return 0;
2061: }
2062:
1.355 djm 2063: /* If CheckHostIP is enabled, then check for mismatched hostname/addr */
2064: if (ctx->ip_str != NULL && strchr(l->hosts, ',') != NULL) {
2065: if ((l->match & HKF_MATCH_HOST) == 0) {
2066: /* Record if address matched a different hostname. */
2067: ctx->other_name_seen = 1;
2068: debug3_f("found address %s against different hostname "
2069: "at %s:%ld", ctx->ip_str, l->path, l->linenum);
2070: return 0;
2071: } else if ((l->match & HKF_MATCH_IP) == 0) {
2072: /* Record if hostname matched a different address. */
2073: ctx->other_name_seen = 1;
2074: debug3_f("found hostname %s against different address "
2075: "at %s:%ld", ctx->host_str, l->path, l->linenum);
2076: }
1.353 djm 2077: }
1.269 djm 2078:
1.350 djm 2079: /*
2080: * UpdateHostkeys is skipped for wildcard host names and hostnames
2081: * that contain more than two entries (ssh never writes these).
2082: */
2083: if (hostspec_is_complex(l->hosts)) {
1.354 djm 2084: debug3_f("hostkeys file %s:%ld complex host specification",
2085: l->path, l->linenum);
1.350 djm 2086: ctx->complex_hostspec = 1;
1.347 djm 2087: return 0;
2088: }
2089:
1.269 djm 2090: /* Mark off keys we've already seen for this host */
2091: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2092: if (!sshkey_equal(l->key, ctx->keys[i]))
2093: continue;
1.354 djm 2094: debug3_f("found %s key at %s:%ld",
1.351 djm 2095: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
2096: ctx->keys_match[i] |= l->match;
2097: return 0;
1.269 djm 2098: }
2099: /* This line contained a key that not offered by the server */
1.354 djm 2100: debug3_f("deprecated %s key at %s:%ld", sshkey_ssh_name(l->key),
2101: l->path, l->linenum);
1.299 deraadt 2102: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 2103: sizeof(*ctx->old_keys))) == NULL)
1.354 djm 2104: fatal_f("recallocarray failed nold = %zu", ctx->nold);
1.269 djm 2105: ctx->old_keys = tmp;
2106: ctx->old_keys[ctx->nold++] = l->key;
2107: l->key = NULL;
2108:
2109: return 0;
2110: }
2111:
1.352 djm 2112: /* callback to search for ctx->old_keys in known_hosts under other names */
2113: static int
2114: hostkeys_check_old(struct hostkey_foreach_line *l, void *_ctx)
2115: {
2116: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2117: size_t i;
2118: int hashed;
2119:
2120: /* only care about lines that *don't* match the active host spec */
2121: if (l->status == HKF_STATUS_MATCHED || l->key == NULL)
2122: return 0;
2123:
2124: hashed = l->match & (HKF_MATCH_HOST_HASHED|HKF_MATCH_IP_HASHED);
2125: for (i = 0; i < ctx->nold; i++) {
2126: if (!sshkey_equal(l->key, ctx->old_keys[i]))
2127: continue;
1.354 djm 2128: debug3_f("found deprecated %s key at %s:%ld as %s",
1.364 djm 2129: sshkey_ssh_name(ctx->old_keys[i]), l->path, l->linenum,
1.352 djm 2130: hashed ? "[HASHED]" : l->hosts);
2131: ctx->old_key_seen = 1;
2132: break;
2133: }
2134: return 0;
2135: }
2136:
2137: /*
2138: * Check known_hosts files for deprecated keys under other names. Returns 0
2139: * on success or -1 on failure. Updates ctx->old_key_seen if deprecated keys
2140: * exist under names other than the active hostname/IP.
2141: */
2142: static int
2143: check_old_keys_othernames(struct hostkeys_update_ctx *ctx)
2144: {
2145: size_t i;
2146: int r;
2147:
1.354 djm 2148: debug2_f("checking for %zu deprecated keys", ctx->nold);
1.352 djm 2149: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2150: debug3_f("searching %s for %s / %s",
1.352 djm 2151: options.user_hostfiles[i], ctx->host_str,
2152: ctx->ip_str ? ctx->ip_str : "(none)");
2153: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2154: hostkeys_check_old, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2155: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.352 djm 2156: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2157: debug_f("hostkeys file %s does not exist",
2158: options.user_hostfiles[i]);
1.352 djm 2159: continue;
2160: }
1.354 djm 2161: error_fr(r, "hostkeys_foreach failed for %s",
2162: options.user_hostfiles[i]);
1.352 djm 2163: return -1;
2164: }
2165: }
2166: return 0;
2167: }
2168:
1.269 djm 2169: static void
1.337 djm 2170: hostkey_change_preamble(LogLevel loglevel)
1.269 djm 2171: {
1.336 djm 2172: do_log2(loglevel, "The server has updated its host keys.");
2173: do_log2(loglevel, "These changes were verified by the server's "
2174: "existing trusted key.");
2175: }
2176:
2177: static void
2178: update_known_hosts(struct hostkeys_update_ctx *ctx)
2179: {
2180: int r, was_raw = 0, first = 1;
2181: int asking = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK;
2182: LogLevel loglevel = asking ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1.269 djm 2183: char *fp, *response;
2184: size_t i;
1.333 djm 2185: struct stat sb;
1.269 djm 2186:
2187: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2188: if (!ctx->keys_verified[i])
1.269 djm 2189: continue;
2190: if ((fp = sshkey_fingerprint(ctx->keys[i],
2191: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2192: fatal_f("sshkey_fingerprint failed");
1.336 djm 2193: if (first && asking)
1.337 djm 2194: hostkey_change_preamble(loglevel);
1.269 djm 2195: do_log2(loglevel, "Learned new hostkey: %s %s",
2196: sshkey_type(ctx->keys[i]), fp);
1.336 djm 2197: first = 0;
1.269 djm 2198: free(fp);
2199: }
2200: for (i = 0; i < ctx->nold; i++) {
2201: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2202: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2203: fatal_f("sshkey_fingerprint failed");
1.336 djm 2204: if (first && asking)
1.337 djm 2205: hostkey_change_preamble(loglevel);
1.269 djm 2206: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2207: sshkey_type(ctx->old_keys[i]), fp);
1.336 djm 2208: first = 0;
1.269 djm 2209: free(fp);
2210: }
2211: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2212: if (get_saved_tio() != NULL) {
2213: leave_raw_mode(1);
2214: was_raw = 1;
2215: }
1.269 djm 2216: response = NULL;
2217: for (i = 0; !quit_pending && i < 3; i++) {
2218: free(response);
2219: response = read_passphrase("Accept updated hostkeys? "
2220: "(yes/no): ", RP_ECHO);
1.389 dtucker 2221: if (response != NULL && strcasecmp(response, "yes") == 0)
1.269 djm 2222: break;
2223: else if (quit_pending || response == NULL ||
2224: strcasecmp(response, "no") == 0) {
2225: options.update_hostkeys = 0;
2226: break;
2227: } else {
2228: do_log2(loglevel, "Please enter "
2229: "\"yes\" or \"no\"");
2230: }
2231: }
2232: if (quit_pending || i >= 3 || response == NULL)
2233: options.update_hostkeys = 0;
2234: free(response);
1.271 djm 2235: if (was_raw)
2236: enter_raw_mode(1);
1.269 djm 2237: }
1.333 djm 2238: if (options.update_hostkeys == 0)
2239: return;
1.269 djm 2240: /*
2241: * Now that all the keys are verified, we can go ahead and replace
2242: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2243: * cancel the operation).
2244: */
1.333 djm 2245: for (i = 0; i < options.num_user_hostfiles; i++) {
2246: /*
2247: * NB. keys are only added to hostfiles[0], for the rest we
2248: * just delete the hostname entries.
2249: */
2250: if (stat(options.user_hostfiles[i], &sb) != 0) {
2251: if (errno == ENOENT) {
1.354 djm 2252: debug_f("known hosts file %s does not "
2253: "exist", options.user_hostfiles[i]);
1.333 djm 2254: } else {
1.354 djm 2255: error_f("known hosts file %s "
2256: "inaccessible: %s",
2257: options.user_hostfiles[i], strerror(errno));
1.333 djm 2258: }
2259: continue;
2260: }
2261: if ((r = hostfile_replace_entries(options.user_hostfiles[i],
2262: ctx->host_str, ctx->ip_str,
2263: i == 0 ? ctx->keys : NULL, i == 0 ? ctx->nkeys : 0,
2264: options.hash_known_hosts, 0,
2265: options.fingerprint_hash)) != 0) {
1.354 djm 2266: error_fr(r, "hostfile_replace_entries failed for %s",
2267: options.user_hostfiles[i]);
1.333 djm 2268: }
2269: }
1.269 djm 2270: }
2271:
2272: static void
1.381 djm 2273: client_global_hostkeys_prove_confirm(struct ssh *ssh, int type,
1.303 djm 2274: u_int32_t seq, void *_ctx)
1.269 djm 2275: {
2276: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2277: size_t i, ndone;
2278: struct sshbuf *signdata;
1.375 djm 2279: int r, plaintype;
1.269 djm 2280: const u_char *sig;
1.375 djm 2281: const char *rsa_kexalg = NULL;
2282: char *alg = NULL;
1.269 djm 2283: size_t siglen;
2284:
2285: if (ctx->nnew == 0)
1.354 djm 2286: fatal_f("ctx->nnew == 0"); /* sanity */
1.269 djm 2287: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2288: error("Server failed to confirm ownership of "
2289: "private host keys");
2290: hostkeys_update_ctx_free(ctx);
2291: return;
2292: }
1.375 djm 2293: if (sshkey_type_plain(sshkey_type_from_name(
2294: ssh->kex->hostkey_alg)) == KEY_RSA)
2295: rsa_kexalg = ssh->kex->hostkey_alg;
1.269 djm 2296: if ((signdata = sshbuf_new()) == NULL)
1.354 djm 2297: fatal_f("sshbuf_new failed");
1.269 djm 2298: /*
2299: * Expect a signature for each of the ctx->nnew private keys we
2300: * haven't seen before. They will be in the same order as the
1.351 djm 2301: * ctx->keys where the corresponding ctx->keys_match[i] == 0.
1.269 djm 2302: */
2303: for (ndone = i = 0; i < ctx->nkeys; i++) {
1.351 djm 2304: if (ctx->keys_match[i])
1.269 djm 2305: continue;
1.375 djm 2306: plaintype = sshkey_type_plain(ctx->keys[i]->type);
1.269 djm 2307: /* Prepare data to be signed: session ID, unique string, key */
2308: sshbuf_reset(signdata);
1.270 djm 2309: if ( (r = sshbuf_put_cstring(signdata,
2310: "hostkeys-prove-00@openssh.com")) != 0 ||
1.358 djm 2311: (r = sshbuf_put_stringb(signdata,
2312: ssh->kex->session_id)) != 0 ||
1.269 djm 2313: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1.354 djm 2314: fatal_fr(r, "compose signdata");
1.269 djm 2315: /* Extract and verify signature */
2316: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1.354 djm 2317: error_fr(r, "parse sig");
1.269 djm 2318: goto out;
2319: }
1.375 djm 2320: if ((r = sshkey_get_sigtype(sig, siglen, &alg)) != 0) {
2321: error_fr(r, "server gave unintelligible signature "
2322: "for %s key %zu", sshkey_type(ctx->keys[i]), i);
2323: goto out;
2324: }
1.309 djm 2325: /*
1.375 djm 2326: * Special case for RSA keys: if a RSA hostkey was negotiated,
2327: * then use its signature type for verification of RSA hostkey
2328: * proofs. Otherwise, accept only RSA-SHA256/512 signatures.
1.309 djm 2329: */
1.375 djm 2330: if (plaintype == KEY_RSA && rsa_kexalg == NULL &&
2331: match_pattern_list(alg, HOSTKEY_PROOF_RSA_ALGS, 0) != 1) {
2332: debug_f("server used untrusted RSA signature algorithm "
2333: "%s for key %zu, disregarding", alg, i);
2334: free(alg);
2335: /* zap the key from the list */
2336: sshkey_free(ctx->keys[i]);
2337: ctx->keys[i] = NULL;
2338: ndone++;
2339: continue;
2340: }
2341: debug3_f("verify %s key %zu using sigalg %s",
2342: sshkey_type(ctx->keys[i]), i, alg);
2343: free(alg);
1.269 djm 2344: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 2345: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.375 djm 2346: plaintype == KEY_RSA ? rsa_kexalg : NULL, 0, NULL)) != 0) {
1.361 djm 2347: error_fr(r, "server gave bad signature for %s key %zu",
1.354 djm 2348: sshkey_type(ctx->keys[i]), i);
1.269 djm 2349: goto out;
2350: }
2351: /* Key is good. Mark it as 'seen' */
1.351 djm 2352: ctx->keys_verified[i] = 1;
1.269 djm 2353: ndone++;
2354: }
1.354 djm 2355: /* Shouldn't happen */
1.269 djm 2356: if (ndone != ctx->nnew)
1.354 djm 2357: fatal_f("ndone != ctx->nnew (%zu / %zu)", ndone, ctx->nnew);
1.320 djm 2358: if ((r = sshpkt_get_end(ssh)) != 0) {
1.354 djm 2359: error_f("protocol error");
1.320 djm 2360: goto out;
2361: }
1.269 djm 2362:
2363: /* Make the edits to known_hosts */
2364: update_known_hosts(ctx);
2365: out:
2366: hostkeys_update_ctx_free(ctx);
1.384 djm 2367: hostkeys_update_complete = 1;
2368: client_repledge();
1.269 djm 2369: }
2370:
1.267 djm 2371: /*
1.291 djm 2372: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
2373: * Made slightly less trivial by the multiple RSA signature algorithm names.
2374: */
2375: static int
2376: key_accepted_by_hostkeyalgs(const struct sshkey *key)
2377: {
2378: const char *ktype = sshkey_ssh_name(key);
1.331 dtucker 2379: const char *hostkeyalgs = options.hostkeyalgorithms;
1.291 djm 2380:
1.391 djm 2381: if (key->type == KEY_UNSPEC)
1.291 djm 2382: return 0;
2383: if (key->type == KEY_RSA &&
2384: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
2385: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
2386: return 1;
2387: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
2388: }
2389:
2390: /*
1.270 djm 2391: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2392: * the server's hostkeys. The keys are checked against the user's
2393: * HostkeyAlgorithms preference before they are accepted.
2394: */
2395: static int
1.321 djm 2396: client_input_hostkeys(struct ssh *ssh)
1.267 djm 2397: {
2398: const u_char *blob = NULL;
1.269 djm 2399: size_t i, len = 0;
1.267 djm 2400: struct sshbuf *buf = NULL;
1.269 djm 2401: struct sshkey *key = NULL, **tmp;
1.384 djm 2402: int r, prove_sent = 0;
1.269 djm 2403: char *fp;
1.267 djm 2404: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2405: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2406: struct hostkeys_update_ctx *ctx = NULL;
1.351 djm 2407: u_int want;
1.267 djm 2408:
2409: if (hostkeys_seen)
1.354 djm 2410: fatal_f("server already sent hostkeys");
1.384 djm 2411: if (!can_update_hostkeys())
1.267 djm 2412: return 1;
1.384 djm 2413: hostkeys_seen = 1;
1.272 djm 2414:
2415: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2416: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2417: sshkey_free(key);
2418: key = NULL;
1.269 djm 2419: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
1.354 djm 2420: error_fr(r, "parse key");
1.269 djm 2421: goto out;
2422: }
1.270 djm 2423: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
1.354 djm 2424: do_log2_fr(r, r == SSH_ERR_KEY_TYPE_UNKNOWN ?
1.335 djm 2425: SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR,
1.354 djm 2426: "convert key");
1.335 djm 2427: continue;
1.270 djm 2428: }
1.267 djm 2429: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2430: SSH_FP_DEFAULT);
1.354 djm 2431: debug3_f("received %s key %s", sshkey_type(key), fp);
1.267 djm 2432: free(fp);
1.275 markus 2433:
1.291 djm 2434: if (!key_accepted_by_hostkeyalgs(key)) {
1.354 djm 2435: debug3_f("%s key not permitted by "
2436: "HostkeyAlgorithms", sshkey_ssh_name(key));
1.267 djm 2437: continue;
2438: }
1.269 djm 2439: /* Skip certs */
2440: if (sshkey_is_cert(key)) {
1.354 djm 2441: debug3_f("%s key is a certificate; skipping",
2442: sshkey_ssh_name(key));
1.269 djm 2443: continue;
2444: }
2445: /* Ensure keys are unique */
2446: for (i = 0; i < ctx->nkeys; i++) {
2447: if (sshkey_equal(key, ctx->keys[i])) {
1.354 djm 2448: error_f("received duplicated %s host key",
2449: sshkey_ssh_name(key));
1.269 djm 2450: goto out;
2451: }
2452: }
2453: /* Key is good, record it */
1.299 deraadt 2454: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2455: sizeof(*ctx->keys))) == NULL)
1.354 djm 2456: fatal_f("recallocarray failed nkeys = %zu",
2457: ctx->nkeys);
1.269 djm 2458: ctx->keys = tmp;
2459: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2460: key = NULL;
2461: }
2462:
1.269 djm 2463: if (ctx->nkeys == 0) {
1.354 djm 2464: debug_f("server sent no hostkeys");
1.267 djm 2465: goto out;
2466: }
1.270 djm 2467:
1.351 djm 2468: if ((ctx->keys_match = calloc(ctx->nkeys,
2469: sizeof(*ctx->keys_match))) == NULL ||
2470: (ctx->keys_verified = calloc(ctx->nkeys,
2471: sizeof(*ctx->keys_verified))) == NULL)
1.354 djm 2472: fatal_f("calloc failed");
1.267 djm 2473:
1.268 djm 2474: get_hostfile_hostname_ipaddr(host,
2475: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2476: options.port, &ctx->host_str,
2477: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2478:
1.269 djm 2479: /* Find which keys we already know about. */
1.333 djm 2480: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2481: debug_f("searching %s for %s / %s",
1.339 dtucker 2482: options.user_hostfiles[i], ctx->host_str,
1.340 dtucker 2483: ctx->ip_str ? ctx->ip_str : "(none)");
1.333 djm 2484: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2485: hostkeys_find, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2486: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.333 djm 2487: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2488: debug_f("hostkeys file %s does not exist",
2489: options.user_hostfiles[i]);
1.333 djm 2490: continue;
2491: }
1.354 djm 2492: error_fr(r, "hostkeys_foreach failed for %s",
2493: options.user_hostfiles[i]);
1.333 djm 2494: goto out;
2495: }
1.267 djm 2496: }
2497:
1.269 djm 2498: /* Figure out if we have any new keys to add */
1.351 djm 2499: ctx->nnew = ctx->nincomplete = 0;
2500: want = HKF_MATCH_HOST | ( options.check_host_ip ? HKF_MATCH_IP : 0);
1.269 djm 2501: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2502: if (ctx->keys_match[i] == 0)
1.269 djm 2503: ctx->nnew++;
1.351 djm 2504: if ((ctx->keys_match[i] & want) != want)
2505: ctx->nincomplete++;
1.269 djm 2506: }
2507:
1.354 djm 2508: debug3_f("%zu server keys: %zu new, %zu retained, "
2509: "%zu incomplete match. %zu to remove", ctx->nkeys, ctx->nnew,
2510: ctx->nkeys - ctx->nnew - ctx->nincomplete,
1.351 djm 2511: ctx->nincomplete, ctx->nold);
1.269 djm 2512:
1.353 djm 2513: if (ctx->nnew == 0 && ctx->nold == 0) {
1.354 djm 2514: debug_f("no new or deprecated keys from server");
1.353 djm 2515: goto out;
2516: }
2517:
2518: /* Various reasons why we cannot proceed with the update */
2519: if (ctx->complex_hostspec) {
1.354 djm 2520: debug_f("CA/revocation marker, manual host list or wildcard "
2521: "host pattern found, skipping UserKnownHostsFile update");
1.353 djm 2522: goto out;
2523: }
2524: if (ctx->other_name_seen) {
1.354 djm 2525: debug_f("host key found matching a different name/address, "
2526: "skipping UserKnownHostsFile update");
1.347 djm 2527: goto out;
1.352 djm 2528: }
2529: /*
2530: * If removing keys, check whether they appear under different
2531: * names/addresses and refuse to proceed if they do. This avoids
2532: * cases such as hosts with multiple names becoming inconsistent
2533: * with regards to CheckHostIP entries.
2534: * XXX UpdateHostkeys=force to override this (and other) checks?
2535: */
2536: if (ctx->nold != 0) {
2537: if (check_old_keys_othernames(ctx) != 0)
2538: goto out; /* error already logged */
2539: if (ctx->old_key_seen) {
1.354 djm 2540: debug_f("key(s) for %s%s%s exist under other names; "
2541: "skipping UserKnownHostsFile update",
1.352 djm 2542: ctx->host_str, ctx->ip_str == NULL ? "" : ",",
2543: ctx->ip_str == NULL ? "" : ctx->ip_str);
2544: goto out;
2545: }
2546: }
2547:
1.353 djm 2548: if (ctx->nnew == 0) {
1.351 djm 2549: /*
2550: * We have some keys to remove or fix matching for.
2551: * We can proceed to do this without requiring a fresh proof
2552: * from the server.
2553: */
1.269 djm 2554: update_known_hosts(ctx);
1.353 djm 2555: goto out;
2556: }
2557: /*
2558: * We have received previously-unseen keys from the server.
2559: * Ask the server to confirm ownership of the private halves.
2560: */
1.354 djm 2561: debug3_f("asking server to prove ownership for %zu keys", ctx->nnew);
1.353 djm 2562: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2563: (r = sshpkt_put_cstring(ssh,
2564: "hostkeys-prove-00@openssh.com")) != 0 ||
2565: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
1.354 djm 2566: fatal_fr(r, "prepare hostkeys-prove");
1.353 djm 2567: if ((buf = sshbuf_new()) == NULL)
1.354 djm 2568: fatal_f("sshbuf_new");
1.353 djm 2569: for (i = 0; i < ctx->nkeys; i++) {
2570: if (ctx->keys_match[i])
2571: continue;
2572: sshbuf_reset(buf);
2573: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0 ||
1.354 djm 2574: (r = sshpkt_put_stringb(ssh, buf)) != 0)
2575: fatal_fr(r, "assemble hostkeys-prove");
1.269 djm 2576: }
1.353 djm 2577: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2578: fatal_fr(r, "send hostkeys-prove");
1.353 djm 2579: client_register_global_confirm(
1.381 djm 2580: client_global_hostkeys_prove_confirm, ctx);
1.353 djm 2581: ctx = NULL; /* will be freed in callback */
1.384 djm 2582: prove_sent = 1;
1.269 djm 2583:
1.267 djm 2584: /* Success */
2585: out:
1.269 djm 2586: hostkeys_update_ctx_free(ctx);
1.267 djm 2587: sshkey_free(key);
2588: sshbuf_free(buf);
1.384 djm 2589: if (!prove_sent) {
2590: /* UpdateHostkeys handling completed */
2591: hostkeys_update_complete = 1;
2592: client_repledge();
2593: }
1.269 djm 2594: /*
2595: * NB. Return success for all cases. The server doesn't need to know
2596: * what the client does with its hosts file.
2597: */
2598: return 1;
1.267 djm 2599: }
2600:
1.264 markus 2601: static int
1.297 markus 2602: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2603: {
2604: char *rtype;
1.320 djm 2605: u_char want_reply;
2606: int r, success = 0;
1.95 markus 2607:
1.320 djm 2608: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
2609: (r = sshpkt_get_u8(ssh, &want_reply)) != 0)
2610: goto out;
1.117 markus 2611: debug("client_input_global_request: rtype %s want_reply %d",
2612: rtype, want_reply);
1.270 djm 2613: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.321 djm 2614: success = client_input_hostkeys(ssh);
1.95 markus 2615: if (want_reply) {
1.320 djm 2616: if ((r = sshpkt_start(ssh, success ? SSH2_MSG_REQUEST_SUCCESS :
2617: SSH2_MSG_REQUEST_FAILURE)) != 0 ||
2618: (r = sshpkt_send(ssh)) != 0 ||
2619: (r = ssh_packet_write_wait(ssh)) != 0)
2620: goto out;
1.95 markus 2621: }
1.320 djm 2622: r = 0;
2623: out:
1.250 djm 2624: free(rtype);
1.320 djm 2625: return r;
1.95 markus 2626: }
1.22 markus 2627:
1.354 djm 2628: static void
2629: client_send_env(struct ssh *ssh, int id, const char *name, const char *val)
2630: {
2631: int r;
2632:
2633: debug("channel %d: setting env %s = \"%s\"", id, name, val);
2634: channel_request_start(ssh, id, "env", 0);
2635: if ((r = sshpkt_put_cstring(ssh, name)) != 0 ||
2636: (r = sshpkt_put_cstring(ssh, val)) != 0 ||
2637: (r = sshpkt_send(ssh)) != 0)
2638: fatal_fr(r, "send setenv");
2639: }
2640:
1.123 djm 2641: void
1.303 djm 2642: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.315 markus 2643: const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd,
2644: char **env)
1.123 djm 2645: {
1.380 djm 2646: size_t i, j, len;
2647: int matched, r;
1.313 djm 2648: char *name, *val;
1.132 djm 2649: Channel *c = NULL;
1.123 djm 2650:
1.354 djm 2651: debug2_f("id %d", id);
1.123 djm 2652:
1.303 djm 2653: if ((c = channel_lookup(ssh, id)) == NULL)
1.354 djm 2654: fatal_f("channel %d: unknown channel", id);
1.224 djm 2655:
1.320 djm 2656: ssh_packet_set_interactive(ssh, want_tty,
1.224 djm 2657: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2658:
1.123 djm 2659: if (want_tty) {
2660: struct winsize ws;
2661:
2662: /* Store window size in the packet. */
1.326 deraadt 2663: if (ioctl(in_fd, TIOCGWINSZ, &ws) == -1)
1.123 djm 2664: memset(&ws, 0, sizeof(ws));
2665:
1.303 djm 2666: channel_request_start(ssh, id, "pty-req", 1);
2667: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.320 djm 2668: if ((r = sshpkt_put_cstring(ssh, term != NULL ? term : ""))
2669: != 0 ||
2670: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
2671: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
2672: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
2673: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0)
1.354 djm 2674: fatal_fr(r, "build pty-req");
1.194 djm 2675: if (tiop == NULL)
2676: tiop = get_saved_tio();
1.316 markus 2677: ssh_tty_make_modes(ssh, -1, tiop);
1.320 djm 2678: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2679: fatal_fr(r, "send pty-req");
1.123 djm 2680: /* XXX wait for reply */
1.132 djm 2681: c->client_tty = 1;
1.123 djm 2682: }
2683:
2684: /* Transfer any environment variables from client to server */
1.126 djm 2685: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2686: debug("Sending environment.");
1.126 djm 2687: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2688: /* Split */
1.126 djm 2689: name = xstrdup(env[i]);
1.123 djm 2690: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2691: free(name);
1.123 djm 2692: continue;
2693: }
2694: *val++ = '\0';
2695:
2696: matched = 0;
2697: for (j = 0; j < options.num_send_env; j++) {
2698: if (match_pattern(name, options.send_env[j])) {
2699: matched = 1;
2700: break;
2701: }
2702: }
2703: if (!matched) {
2704: debug3("Ignored env %s", name);
1.250 djm 2705: free(name);
1.123 djm 2706: continue;
2707: }
1.354 djm 2708: client_send_env(ssh, id, name, val);
1.250 djm 2709: free(name);
1.123 djm 2710: }
1.313 djm 2711: }
2712: for (i = 0; i < options.num_setenv; i++) {
2713: /* Split */
2714: name = xstrdup(options.setenv[i]);
2715: if ((val = strchr(name, '=')) == NULL) {
2716: free(name);
2717: continue;
2718: }
2719: *val++ = '\0';
1.354 djm 2720: client_send_env(ssh, id, name, val);
1.313 djm 2721: free(name);
1.123 djm 2722: }
2723:
1.315 markus 2724: len = sshbuf_len(cmd);
1.123 djm 2725: if (len > 0) {
2726: if (len > 900)
2727: len = 900;
2728: if (want_subsystem) {
1.190 djm 2729: debug("Sending subsystem: %.*s",
1.380 djm 2730: (int)len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2731: channel_request_start(ssh, id, "subsystem", 1);
2732: client_expect_confirm(ssh, id, "subsystem",
2733: CONFIRM_CLOSE);
1.123 djm 2734: } else {
1.190 djm 2735: debug("Sending command: %.*s",
1.380 djm 2736: (int)len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2737: channel_request_start(ssh, id, "exec", 1);
2738: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2739: }
1.320 djm 2740: if ((r = sshpkt_put_stringb(ssh, cmd)) != 0 ||
2741: (r = sshpkt_send(ssh)) != 0)
1.354 djm 2742: fatal_fr(r, "send command");
1.123 djm 2743: } else {
1.303 djm 2744: channel_request_start(ssh, id, "shell", 1);
2745: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.354 djm 2746: if ((r = sshpkt_send(ssh)) != 0)
2747: fatal_fr(r, "send shell");
1.123 djm 2748: }
1.384 djm 2749:
2750: session_setup_complete = 1;
2751: client_repledge();
1.123 djm 2752: }
2753:
1.77 itojun 2754: static void
1.321 djm 2755: client_init_dispatch(struct ssh *ssh)
1.16 markus 2756: {
1.321 djm 2757: ssh_dispatch_init(ssh, &dispatch_protocol_error);
1.100 markus 2758:
1.321 djm 2759: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2760: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2761: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2762: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2763: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2764: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2765: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2766: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2767: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2768: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2769: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2770: ssh_dispatch_set(ssh, SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2771:
2772: /* rekeying */
1.321 djm 2773: ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2774:
2775: /* global request reply messages */
1.321 djm 2776: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2777: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2778: }
2779:
2780: void
2781: client_stop_mux(void)
2782: {
2783: if (options.control_path != NULL && muxserver_sock != -1)
2784: unlink(options.control_path);
2785: /*
1.247 dtucker 2786: * If we are in persist mode, or don't have a shell, signal that we
2787: * should close when all active channels are closed.
1.232 djm 2788: */
1.366 djm 2789: if (options.control_persist || options.session_type == SESSION_TYPE_NONE) {
1.232 djm 2790: session_closed = 1;
1.235 djm 2791: setproctitle("[stopped mux]");
2792: }
1.113 markus 2793: }
2794:
2795: /* client specific fatal cleanup */
2796: void
1.114 markus 2797: cleanup_exit(int i)
1.113 markus 2798: {
1.233 djm 2799: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.192 djm 2800: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2801: unlink(options.control_path);
1.223 djm 2802: ssh_kill_proxy_command();
1.114 markus 2803: _exit(i);
1.1 deraadt 2804: }
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